build: Fix autoconf warnings

This patch avoids the following warnings on running autogen script . . . Running autoconf... configure.ac:896: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call detected in body ../../lib/autoconf/lang.m4:193: AC_LANG_CONFTEST is expanded from... configure.ac:896: the top level . . . This change uses AC_LINK_IFELSE for checking the atomic built-in function support. Since AC_COMPILE_IFELSE checks for syntactical errors only, we need to use AC_LINK_IFELSE to achieve the same which is more appropriate. Reference links: [1] https://autotools.io/forwardporting/autoconf.html [2] http://www.gnu.org/software/autoconf/manual/autoconf.html#Generating-Sources [3] http://www.gnu.org/software/autoconf/manual/autoconf.html#Running-the-Compiler Change-Id: I4597f2976623496745b66f98bb78a0c9f1b07f79 BUG: 1198849 Signed-off-by: Anoop C S <anoopcs@redhat.com> Reviewed-on: http://review.gluster.org/12351 Tested-by: NetBSD Build System <jenkins@build.gluster.org> Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Niels de Vos <ndevos@redhat.com>
author: Anoop C S <anoopcs@redhat.com> 2015-10-14 13:11:37 +0530
committer: Niels de Vos <ndevos@redhat.com> 2015-11-09 01:11:58 -0800
commit: f68c95a429b44afc0197152a7819d17ce1de734c (patch)
tree: c4b5e670ecabeb6d8d2d07e16cdce5f49f7d1a19 /geo-replication/syncdaemon
parent: 01ed634a490d3ea7c4bbb051a0a9f0512f8f7694 (diff)
0 files changed, 0 insertions, 0 deletions
diff --git a/xlators/Makefile.am b/xlators/Makefile.am
index b1643d26c..f60fa85ce 100644
--- a/xlators/Makefile.am
+++ b/xlators/Makefile.am
@@ -1,3 +1,4 @@
-SUBDIRS = cluster storage protocol performance debug features encryption mount nfs mgmt system
+SUBDIRS = cluster storage protocol performance debug features encryption mount nfs mgmt system \
+          playground
 
 CLEANFILES =
diff --git a/xlators/cluster/afr/src/afr-common.c b/xlators/cluster/afr/src/afr-common.c
index 537b9c206..af01f2ef2 100644
--- a/xlators/cluster/afr/src/afr-common.c
+++ b/xlators/cluster/afr/src/afr-common.c
@@ -51,7 +51,7 @@
 
 #define AFR_ICTX_OPENDIR_DONE_MASK     0x0000000100000000ULL
 #define AFR_ICTX_READ_CHILD_MASK       0x00000000FFFFFFFFULL
-
+#define AFR_STATISTICS_HISTORY_SIZE    50
 int
 afr_lookup_done_success_action (call_frame_t *frame, xlator_t *this,
                                 gf_boolean_t fail_conflict);
@@ -779,6 +779,12 @@ afr_local_sh_cleanup (afr_local_t *local, xlator_t *this)
         sh = &local->self_heal;
         priv = this->private;
 
+        if (sh->data_sh_info && strcmp (sh->data_sh_info, ""))
+                GF_FREE (sh->data_sh_info);
+
+        if (sh->metadata_sh_info && strcmp (sh->metadata_sh_info, ""))
+                GF_FREE (sh->metadata_sh_info);
+
         GF_FREE (sh->buf);
 
         GF_FREE (sh->parentbufs);
@@ -826,7 +832,8 @@ afr_local_sh_cleanup (afr_local_t *local, xlator_t *this)
 void
 afr_local_transaction_cleanup (afr_local_t *local, xlator_t *this)
 {
-        afr_private_t * priv = NULL;
+        afr_private_t *priv    = NULL;
+        int           i        = 0;
 
         priv = this->private;
 
@@ -836,7 +843,9 @@ afr_local_transaction_cleanup (afr_local_t *local, xlator_t *this)
 
         GF_FREE (local->internal_lock.locked_nodes);
 
-        GF_FREE (local->internal_lock.inode_locked_nodes);
+        for (i = 0; local->internal_lock.inodelk[i].domain; i++) {
+                GF_FREE (local->internal_lock.inodelk[i].locked_nodes);
+        }
 
         GF_FREE (local->internal_lock.lower_locked_nodes);
 
@@ -850,6 +859,8 @@ afr_local_transaction_cleanup (afr_local_t *local, xlator_t *this)
 
         loc_wipe (&local->transaction.parent_loc);
         loc_wipe (&local->transaction.new_parent_loc);
+
+        GF_FREE (local->transaction.postop_piggybacked);
 }
 
 
@@ -1069,6 +1080,88 @@ afr_update_loc_gfids (loc_t *loc, struct iatt *buf, struct iatt *postparent)
                 uuid_copy (loc->pargfid, postparent->ia_gfid);
 }
 
+/*
+ * Quota size xattrs are not maintained by afr. There is a
+ * possibility that they differ even when both the directory changelog xattrs
+ * suggest everything is fine. So if there is at least one 'source' check among
+ * the sources which has the maximum quota size. Otherwise check among all the
+ * available ones for maximum quota size. This way if there is a source and
+ * stale copies it always votes for the 'source'.
+ * */
+
+static void
+afr_handle_quota_size (afr_local_t *local, xlator_t *this,
+                       dict_t *rsp_dict)
+{
+        int32_t       *sources       = NULL;
+        dict_t        *xattr         = NULL;
+        data_t        *max_data      = NULL;
+        int64_t       max_quota_size = -1;
+        data_t        *data          = NULL;
+        int64_t       *size          = NULL;
+        int64_t       quota_size     = -1;
+        afr_private_t *priv          = NULL;
+        int           i              = 0;
+        int           ret            = -1;
+        gf_boolean_t  source_present = _gf_false;
+
+        priv    = this->private;
+        sources = local->cont.lookup.sources;
+
+        if (rsp_dict == NULL) {
+                gf_log_callingfn (this->name, GF_LOG_ERROR, "%s: Invalid "
+                                  "response dictionary", local->loc.path);
+                return;
+        }
+
+        for (i = 0; i < priv->child_count; i++) {
+                if (sources[i]) {
+                        source_present = _gf_true;
+                        break;
+                }
+        }
+
+        for (i = 0; i < priv->child_count; i++) {
+                /*
+                 * If there is at least one source lets check
+                 * for maximum quota sizes among sources, otherwise take the
+                 * maximum of the ones present to be on the safer side.
+                 */
+                if (source_present && !sources[i])
+                        continue;
+
+                xattr = local->cont.lookup.xattrs[i];
+                if (!xattr)
+                        continue;
+
+                data = dict_get (xattr, QUOTA_SIZE_KEY);
+                if (!data)
+                        continue;
+
+                size = (int64_t*)data->data;
+                quota_size = ntoh64(*size);
+                gf_log (this->name, GF_LOG_DEBUG, "%s: %d, size: %"PRId64,
+                        local->loc.path, i, quota_size);
+                if (quota_size > max_quota_size) {
+                        if (max_data)
+                                data_unref (max_data);
+
+                        max_quota_size = quota_size;
+                        max_data = data_ref (data);
+                }
+        }
+
+        if (max_data) {
+                ret = dict_set (rsp_dict, QUOTA_SIZE_KEY, max_data);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR, "%s: Failed to set "
+                                "quota size", local->loc.path);
+                }
+
+                data_unref (max_data);
+        }
+}
+
 int
 afr_lookup_build_response_params (afr_local_t *local, xlator_t *this)
 {
@@ -1113,13 +1206,18 @@ afr_lookup_build_response_params (afr_local_t *local, xlator_t *this)
                 ret = -1;
                 goto out;
         }
+
         gf_log (this->name, GF_LOG_DEBUG, "Building lookup response from %d",
                 read_child);
         if (!*xattr)
                 *xattr = dict_ref (local->cont.lookup.xattrs[read_child]);
+
         *buf = local->cont.lookup.bufs[read_child];
         *postparent = local->cont.lookup.postparents[read_child];
 
+        if (dict_get (local->xattr_req, QUOTA_SIZE_KEY))
+                afr_handle_quota_size (local, this, *xattr);
+
         if (IA_INVAL == local->cont.lookup.inode->ia_type) {
                 /* fix for RT #602 */
                 local->cont.lookup.inode->ia_type = buf->ia_type;
@@ -1268,7 +1366,7 @@ afr_detect_self_heal_by_iatt (afr_local_t *local, xlator_t *this,
 
         if (uuid_compare (buf->ia_gfid, lookup_buf->ia_gfid)) {
                 /* mismatching gfid */
-                gf_log (this->name, GF_LOG_WARNING,
+                gf_log (this->name, GF_LOG_DEBUG,
                         "%s: gfid different on subvolume", local->loc.path);
         }
 }
@@ -1492,7 +1590,7 @@ afr_conflicting_iattrs (struct iatt *bufs, int32_t *success_children,
 
                 child2 = &bufs[success_children[i-1]];
                 if (FILETYPE_DIFFERS (child1, child2)) {
-                        gf_log (xlator_name, GF_LOG_WARNING, "%s: filetype "
+                        gf_log (xlator_name, GF_LOG_DEBUG, "%s: filetype "
                                 "differs on subvolumes (%d, %d)", path,
                                 success_children[i-1], success_children[i]);
                         conflicting = _gf_true;
@@ -1501,7 +1599,7 @@ afr_conflicting_iattrs (struct iatt *bufs, int32_t *success_children,
                 if (!gfid || uuid_is_null (child1->ia_gfid))
                         continue;
                 if (uuid_compare (*gfid, child1->ia_gfid)) {
-                       gf_log (xlator_name, GF_LOG_WARNING, "%s: gfid differs"
+                       gf_log (xlator_name, GF_LOG_DEBUG, "%s: gfid differs"
                                " on subvolume %d", path, success_children[i]);
                        conflicting = _gf_true;
                        goto out;
@@ -1660,7 +1758,6 @@ afr_self_heal_lookup_unwind (call_frame_t *frame, xlator_t *this,
                                        local->loc.path,
                                        local->self_heal.actual_sh_started);
                 }
-
         }
 out:
         AFR_STACK_UNWIND (lookup, frame, local->op_ret, local->op_errno,
@@ -1735,7 +1832,8 @@ afr_lookup_perform_self_heal (call_frame_t *frame, xlator_t *this,
 
         afr_lookup_set_self_heal_params (local, this);
         if (afr_can_self_heal_proceed (&local->self_heal, priv)) {
-                if  (afr_is_transaction_running (local))
+                if  (afr_is_transaction_running (local) &&
+                     (!local->allow_sh_for_running_transaction))
                         goto out;
 
                 reason = "lookup detected pending operations";
@@ -1914,6 +2012,57 @@ out:
         return;
 }
 
+gf_boolean_t
+afr_is_entry_possibly_under_creation (afr_local_t *local, xlator_t *this)
+{
+        /*
+         * We need to perform this test in lookup done and treat on going
+         * create/DELETE as ENOENT.
+         * Reason:
+        Multiple clients A, B and C are attempting 'mkdir -p /mnt/a/b/c'
+
+        1 Client A is in the middle of mkdir(/a). It has acquired lock.
+          It has performed mkdir(/a) on one subvol, and second one is still
+          in progress
+        2 Client B performs a lookup, sees directory /a on one,
+          ENOENT on the other, succeeds lookup.
+        3 Client B performs lookup on /a/b on both subvols, both return ENOENT
+          (one subvol because /a/b does not exist, another because /a
+          itself does not exist)
+        4 Client B proceeds to mkdir /a/b. It obtains entrylk on inode=/a with
+          basename=b on one subvol, but fails on other subvol as /a is yet to
+          be created by Client A.
+        5 Client A finishes mkdir of /a on other subvol
+        6 Client C also attempts to create /a/b, lookup returns ENOENT on
+          both subvols.
+        7 Client C tries to obtain entrylk on on inode=/a with basename=b,
+          obtains on one subvol (where B had failed), and waits for B to unlock
+          on other subvol.
+        8 Client B finishes mkdir() on one subvol with GFID-1 and completes
+          transaction and unlocks
+        9 Client C gets the lock on the second subvol, At this stage second
+          subvol already has /a/b created from Client B, but Client C does not
+          check that in the middle of mkdir transaction
+        10 Client C attempts mkdir /a/b on both subvols. It succeeds on
+           ONLY ONE (where Client B could not get lock because of
+           missing parent /a dir) with GFID-2, and gets EEXIST from ONE subvol.
+        This way we have /a/b in GFID mismatch. One subvol got GFID-1 because
+        Client B performed transaction on only one subvol (because entrylk()
+        could not be obtained on second subvol because of missing parent dir --
+        caused by premature/speculative succeeding of lookup() on /a when locks
+        are detected). Other subvol gets GFID-2 from Client C because while
+        it was waiting for entrylk() on both subvols, Client B was in the
+        middle of creating mkdir() on only one subvol, and Client C does not
+        "expect" this when it is between lock() and pre-op()/op() phase of the
+        transaction.
+         */
+	if (local->cont.lookup.parent_entrylk && local->enoent_count)
+		return _gf_true;
+
+	return _gf_false;
+}
+
+
 static void
 afr_lookup_done (call_frame_t *frame, xlator_t *this)
 {
@@ -1930,6 +2079,12 @@ afr_lookup_done (call_frame_t *frame, xlator_t *this)
         priv  = this->private;
         local = frame->local;
 
+	if (afr_is_entry_possibly_under_creation (local, this)) {
+		local->op_ret = -1;
+		local->op_errno = ENOENT;
+		goto unwind;
+	}
+
         if (local->op_ret < 0)
                 goto unwind;
 
@@ -2273,7 +2428,7 @@ afr_lookup (call_frame_t *frame, xlator_t *this,
         int               call_count     = 0;
         uint64_t          ctx            = 0;
         int32_t           op_errno       = 0;
-
+        int               allow_sh       = 0;
         priv = this->private;
 
         AFR_LOCAL_ALLOC_OR_GOTO (local, out);
@@ -2290,6 +2445,13 @@ afr_lookup (call_frame_t *frame, xlator_t *this,
                 goto out;
         }
 
+        if (local->loc.path &&
+            (strcmp (local->loc.path, "/" GF_REPLICATE_TRASH_DIR) == 0)) {
+                op_errno = EPERM;
+                ret = -1;
+                goto out;
+        }
+
         ret = inode_ctx_get (local->loc.inode, this, &ctx);
         if (ret == 0) {
                 /* lookup is a revalidate */
@@ -2338,6 +2500,11 @@ afr_lookup (call_frame_t *frame, xlator_t *this,
         /* By default assume ENOTCONN. On success it will be set to 0. */
         local->op_errno = ENOTCONN;
 
+        ret = dict_get_int32 (xattr_req, "allow-sh-for-running-transaction",
+                              &allow_sh);
+        dict_del (xattr_req, "allow-sh-for-running-transaction");
+        local->allow_sh_for_running_transaction = allow_sh;
+
         ret = afr_lookup_xattr_req_prepare (local, this, xattr_req, &local->loc,
                                             &gfid_req);
         if (ret) {
@@ -2457,6 +2624,8 @@ __afr_fd_ctx_set (xlator_t *this, fd_t *fd)
         INIT_LIST_HEAD (&fd_ctx->entries);
         fd_ctx->call_child = -1;
 
+        INIT_LIST_HEAD (&fd_ctx->eager_locked);
+
         ret = __fd_ctx_set (fd, this, (uint64_t)(long) fd_ctx);
         if (ret)
                 gf_log (this->name, GF_LOG_DEBUG,
@@ -2513,15 +2682,42 @@ afr_flush_cbk(call_frame_t *frame, void *cookie, xlator_t *this,
         return 0;
 }
 
+static int
+afr_flush_wrapper (call_frame_t *frame, xlator_t *this, fd_t *fd, dict_t *xdata)
+{
+        int           i      = 0;
+        afr_local_t   *local = NULL;
+        afr_private_t *priv  = NULL;
+        int call_count       = -1;
+
+        priv = this->private;
+        local = frame->local;
+        call_count = local->call_count;
+
+        for (i = 0; i < priv->child_count; i++) {
+                if (local->child_up[i]) {
+                        STACK_WIND_COOKIE (frame, afr_flush_cbk,
+                                           (void *) (long) i,
+                                           priv->children[i],
+                                           priv->children[i]->fops->flush,
+                                           local->fd, NULL);
+                        if (!--call_count)
+                                break;
+
+                }
+        }
+
+        return 0;
+}
+
 int
 afr_flush (call_frame_t *frame, xlator_t *this, fd_t *fd, dict_t *xdata)
 {
         afr_private_t *priv  = NULL;
         afr_local_t   *local = NULL;
+        call_stub_t   *stub = NULL;
         int            ret        = -1;
         int            op_errno   = 0;
-	int	       call_count = -1;
-	int	       i = 0;
 
         VALIDATE_OR_GOTO (frame, out);
         VALIDATE_OR_GOTO (this, out);
@@ -2537,23 +2733,14 @@ afr_flush (call_frame_t *frame, xlator_t *this, fd_t *fd, dict_t *xdata)
 		goto out;
 
 	local->fd = fd_ref(fd);
-        call_count = local->call_count;
-
-	afr_delayed_changelog_wake_up (this, fd);
-
-        for (i = 0; i < priv->child_count; i++) {
-                if (local->child_up[i]) {
-                        STACK_WIND_COOKIE (frame, afr_flush_cbk,
-                                           (void *) (long) i,
-                                           priv->children[i],
-                                           priv->children[i]->fops->flush,
-                                           local->fd, NULL);
-
-                        if (!--call_count)
-                                break;
-                }
+        stub = fop_flush_stub (frame, afr_flush_wrapper, fd, xdata);
+        if (!stub) {
+                ret = -1;
+                op_errno = ENOMEM;
+                goto out;
         }
 
+        afr_delayed_changelog_wake_resume (this, fd, stub);
 	ret = 0;
 
 out:
@@ -2629,6 +2816,16 @@ afr_release (xlator_t *this, fd_t *fd)
 /* {{{ fsync */
 
 int
+afr_fsync_unwind_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                      int32_t op_ret, int32_t op_errno, struct iatt *prebuf,
+                      struct iatt *postbuf, dict_t *xdata)
+{
+        AFR_STACK_UNWIND (fsync, frame, op_ret, op_errno, prebuf, postbuf,
+                          xdata);
+        return 0;
+}
+
+int
 afr_fsync_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                int32_t op_ret, int32_t op_errno, struct iatt *prebuf,
                struct iatt *postbuf, dict_t *xdata)
@@ -2637,6 +2834,7 @@ afr_fsync_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
         int call_count = -1;
         int child_index = (long) cookie;
         int read_child  = 0;
+	call_stub_t *stub = NULL;
 
         local = frame->local;
 
@@ -2652,13 +2850,13 @@ afr_fsync_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                         local->op_ret = 0;
 
                         if (local->success_count == 0) {
-                                local->cont.fsync.prebuf  = *prebuf;
-                                local->cont.fsync.postbuf = *postbuf;
+                                local->cont.inode_wfop.prebuf  = *prebuf;
+                                local->cont.inode_wfop.postbuf = *postbuf;
                         }
 
                         if (child_index == read_child) {
-                                local->cont.fsync.prebuf  = *prebuf;
-                                local->cont.fsync.postbuf = *postbuf;
+                                local->cont.inode_wfop.prebuf  = *prebuf;
+                                local->cont.inode_wfop.postbuf = *postbuf;
                         }
 
                         local->success_count++;
@@ -2671,10 +2869,32 @@ afr_fsync_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
         call_count = afr_frame_return (frame);
 
         if (call_count == 0) {
-                AFR_STACK_UNWIND (fsync, frame, local->op_ret, local->op_errno,
-                                  &local->cont.fsync.prebuf,
-                                  &local->cont.fsync.postbuf,
-                                  NULL);
+		/* Make a stub out of the frame, and register it
+		   with the waking up post-op. When the call-stub resumes,
+		   we are guaranteed that there was no post-op pending
+		   (i.e changelogs were unset in the server). This is an
+		   essential "guarantee", that fsync() returns only after
+		   completely finishing EVERYTHING, including the delayed
+		   post-op. This guarantee is expected by FUSE graph switching
+		   for example.
+		*/
+		stub = fop_fsync_cbk_stub (frame, afr_fsync_unwind_cbk,
+                                           local->op_ret, local->op_errno,
+                                           &local->cont.inode_wfop.prebuf,
+                                           &local->cont.inode_wfop.postbuf,
+                                           xdata);
+		if (!stub) {
+			AFR_STACK_UNWIND (fsync, frame, -1, ENOMEM, 0, 0, 0);
+			return 0;
+		}
+
+		/* If no new unstable writes happened between the
+		   time we cleared the unstable write witness flag in afr_fsync
+		   and now, calling afr_delayed_changelog_wake_up() should
+		   wake up and skip over the fsync phase and go straight to
+		   afr_changelog_post_op_now()
+		*/
+		afr_delayed_changelog_wake_resume (this, local->fd, stub);
         }
 
         return 0;
@@ -2709,7 +2929,9 @@ afr_fsync (call_frame_t *frame, xlator_t *this, fd_t *fd,
 
         local->fd             = fd_ref (fd);
 
-        afr_delayed_changelog_wake_up (this, fd);
+	if (afr_fd_has_witnessed_unstable_write (this, fd)) {
+		/* don't care. we only wanted to CLEAR the bit */
+	}
 
         for (i = 0; i < priv->child_count; i++) {
                 if (local->child_up[i]) {
@@ -3868,6 +4090,17 @@ afr_local_init (afr_local_t *local, afr_private_t *priv, int32_t *op_errno)
                 goto out;
         }
 
+        local->transaction.postop_piggybacked = GF_CALLOC (priv->child_count,
+							   sizeof (int),
+							   gf_afr_mt_int32_t);
+        if (!local->transaction.postop_piggybacked) {
+                if (op_errno)
+                        *op_errno = ENOMEM;
+                goto out;
+        }
+
+	local->append_write = _gf_false;
+
         ret = 0;
 out:
         return ret;
@@ -3879,11 +4112,6 @@ afr_internal_lock_init (afr_internal_lock_t *lk, size_t child_count,
 {
         int             ret = -ENOMEM;
 
-        lk->inode_locked_nodes = GF_CALLOC (sizeof (*lk->inode_locked_nodes),
-                                            child_count, gf_afr_mt_char);
-        if (NULL == lk->inode_locked_nodes)
-                goto out;
-
         lk->locked_nodes = GF_CALLOC (sizeof (*lk->locked_nodes),
                                       child_count, gf_afr_mt_char);
         if (NULL == lk->locked_nodes)
@@ -3942,6 +4170,21 @@ out:
 }
 
 int
+afr_inodelk_init (afr_inodelk_t *lk, char *dom, size_t child_count)
+{
+        int             ret = -ENOMEM;
+
+        lk->domain = dom;
+        lk->locked_nodes = GF_CALLOC (sizeof (*lk->locked_nodes),
+                                      child_count, gf_afr_mt_char);
+        if (NULL == lk->locked_nodes)
+                goto out;
+        ret = 0;
+out:
+        return ret;
+}
+
+int
 afr_transaction_local_init (afr_local_t *local, xlator_t *this)
 {
         int            child_up_count = 0;
@@ -3954,6 +4197,14 @@ afr_transaction_local_init (afr_local_t *local, xlator_t *this)
         if (ret < 0)
                 goto out;
 
+        if ((local->transaction.type == AFR_DATA_TRANSACTION) ||
+            (local->transaction.type == AFR_METADATA_TRANSACTION)) {
+                ret = afr_inodelk_init (&local->internal_lock.inodelk[0],
+                                        this->name, priv->child_count);
+                if (ret < 0)
+                        goto out;
+        }
+
         ret = -ENOMEM;
         child_up_count = afr_up_children_count (local->child_up,
                                                 priv->child_count);
@@ -3990,8 +4241,9 @@ afr_transaction_local_init (afr_local_t *local, xlator_t *this)
                                                            AFR_NUM_CHANGE_LOGS);
         if (!local->transaction.txn_changelog)
                 goto out;
-        if (local->fd && (local->transaction.type == AFR_DATA_TRANSACTION))
-                local->transaction.eager_lock_on = priv->eager_lock;
+
+	INIT_LIST_HEAD (&local->transaction.eager_locked);
+
         ret = 0;
 out:
         return ret;
@@ -4179,6 +4431,16 @@ afr_priv_destroy (afr_private_t *priv)
         if (priv->shd.split_brain)
                 eh_destroy (priv->shd.split_brain);
 
+        for (i = 0; i < priv->child_count; i++)
+        {
+                if (priv->shd.statistics[i])
+                        eh_destroy (priv->shd.statistics[i]);
+        }
+
+        GF_FREE (priv->shd.statistics);
+
+        GF_FREE (priv->shd.crawl_events);
+
         GF_FREE (priv->last_event);
         if (priv->pending_key) {
                 for (i = 0; i < priv->child_count; i++)
@@ -4257,3 +4519,73 @@ afr_is_fd_fixable (fd_t *fd)
 
         return _gf_true;
 }
+
+void
+afr_handle_open_fd_count (call_frame_t *frame, xlator_t *this)
+{
+        afr_local_t     *local = NULL;
+        inode_t         *inode = NULL;
+        afr_inode_ctx_t *ctx   = NULL;
+
+        local = frame->local;
+
+        if (local->fd)
+                inode = local->fd->inode;
+        else
+                inode = local->loc.inode;
+
+        if (!inode)
+                return;
+
+        LOCK (&inode->lock);
+        {
+                ctx = __afr_inode_ctx_get (inode, this);
+                ctx->open_fd_count = local->open_fd_count;
+        }
+        UNLOCK (&inode->lock);
+}
+
+int
+afr_initialise_statistics (xlator_t *this)
+{
+        afr_private_t       *priv = NULL;
+        int                 ret = -1;
+        int                 i = 0;
+        int                 child_count = 0;
+        eh_t                *stats_per_brick = NULL;
+        shd_crawl_event_t   ***shd_crawl_events = NULL;
+        priv = this->private;
+
+        priv->shd.statistics = GF_CALLOC (sizeof(eh_t *), priv->child_count,
+                                          gf_common_mt_eh_t);
+        if (!priv->shd.statistics) {
+                ret = -1;
+                goto out;
+        }
+        child_count = priv->child_count;
+        for (i=0; i < child_count ; i++) {
+                stats_per_brick = eh_new (AFR_STATISTICS_HISTORY_SIZE,
+                                          _gf_false,
+                                          _destroy_crawl_event_data);
+                if (!stats_per_brick) {
+                        ret = -1;
+                        goto out;
+                }
+                priv->shd.statistics[i] = stats_per_brick;
+
+        }
+
+        shd_crawl_events = (shd_crawl_event_t***)(&priv->shd.crawl_events);
+        *shd_crawl_events  = GF_CALLOC (sizeof(shd_crawl_event_t*),
+                                        priv->child_count,
+                                        gf_afr_mt_shd_crawl_event_t);
+
+        if (!priv->shd.crawl_events) {
+                ret = -1;
+                goto out;
+        }
+        ret = 0;
+out:
+        return ret;
+
+}
diff --git a/xlators/cluster/afr/src/afr-dir-read.c b/xlators/cluster/afr/src/afr-dir-read.c
index 0e1718814..689dd84e6 100644
--- a/xlators/cluster/afr/src/afr-dir-read.c
+++ b/xlators/cluster/afr/src/afr-dir-read.c
@@ -253,7 +253,7 @@ unlock:
                         goto out;
 
                 if (!afr_is_opendir_done (this, local->fd->inode) &&
-                    up_children_count > 1) {
+                    up_children_count > 1 && priv->entry_self_heal) {
 
                         /*
                          * This is the first opendir on this inode. We need
@@ -383,14 +383,36 @@ afr_forget_entries (fd_t *fd)
         }
 }
 
+static void
+afr_readdir_filter_trash_dir (gf_dirent_t *entries, fd_t *fd)
+{
+        gf_dirent_t *   entry       = NULL;
+        gf_dirent_t *   tmp         = NULL;
+
+        list_for_each_entry_safe (entry, tmp, &entries->list, list) {
+                if (__is_root_gfid (fd->inode->gfid) &&
+                    !strcmp (entry->d_name, GF_REPLICATE_TRASH_DIR)) {
+                        list_del_init (&entry->list);
+                        GF_FREE (entry);
+                }
+        }
+}
 
 int32_t
 afr_readdir_cbk (call_frame_t *frame, void *cookie,
                  xlator_t *this, int32_t op_ret, int32_t op_errno,
                  gf_dirent_t *entries, dict_t *xdata)
 {
-        AFR_STACK_UNWIND (readdir, frame, op_ret, op_errno, entries, NULL);
+        afr_local_t     *local = NULL;
 
+        if (op_ret == -1)
+                goto out;
+
+        local = frame->local;
+        afr_readdir_filter_trash_dir (entries, local->fd);
+
+out:
+        AFR_STACK_UNWIND (readdir, frame, op_ret, op_errno, entries, NULL);
         return 0;
 }
 
@@ -400,8 +422,16 @@ afr_readdirp_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                   int32_t op_ret, int32_t op_errno, gf_dirent_t *entries,
                   dict_t *xdata)
 {
-        AFR_STACK_UNWIND (readdirp, frame, op_ret, op_errno, entries, NULL);
+        afr_local_t     *local = NULL;
+
+        if (op_ret == -1)
+                goto out;
+
+        local = frame->local;
+        afr_readdir_filter_trash_dir (entries, local->fd);
 
+out:
+        AFR_STACK_UNWIND (readdirp, frame, op_ret, op_errno, entries, NULL);
         return 0;
 }
 
diff --git a/xlators/cluster/afr/src/afr-dir-write.c b/xlators/cluster/afr/src/afr-dir-write.c
index a988ea2a8..1943b719b 100644
--- a/xlators/cluster/afr/src/afr-dir-write.c
+++ b/xlators/cluster/afr/src/afr-dir-write.c
@@ -231,7 +231,7 @@ afr_dir_fop_mark_entry_pending_changelog (call_frame_t *frame, xlator_t *this)
         afr_mark_new_entry_changelog (frame, this);
 
 out:
-        local->transaction.resume (frame, this);
+        return;
 }
 
 void
@@ -253,6 +253,7 @@ afr_dir_fop_done (call_frame_t *frame, xlator_t *this)
 done:
         local->transaction.unwind (frame, this);
         afr_dir_fop_mark_entry_pending_changelog (frame, this);
+        local->transaction.resume (frame, this);
 }
 
 /* {{{ create */
@@ -870,6 +871,7 @@ afr_mkdir (call_frame_t *frame, xlator_t *this,
         if (params)
                 local->xdata_req = dict_ref (params);
 
+        local->op = GF_FOP_MKDIR;
         local->transaction.fop    = afr_mkdir_wind;
         local->transaction.done   = afr_mkdir_done;
         local->transaction.unwind = afr_mkdir_unwind;
@@ -1071,6 +1073,7 @@ afr_link (call_frame_t *frame, xlator_t *this,
         }
         UNLOCK (&priv->read_child_lock);
 
+        local->op = GF_FOP_LINK;
         local->transaction.fop    = afr_link_wind;
         local->transaction.done   = afr_link_done;
         local->transaction.unwind = afr_link_unwind;
@@ -1275,6 +1278,7 @@ afr_symlink (call_frame_t *frame, xlator_t *this,
         if (params)
                 local->xdata_req = dict_ref (params);
 
+        local->op = GF_FOP_SYMLINK;
         local->transaction.fop    = afr_symlink_wind;
         local->transaction.done   = afr_symlink_done;
         local->transaction.unwind = afr_symlink_unwind;
@@ -1371,6 +1375,7 @@ afr_rename_wind_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                 if (afr_fop_failed (op_ret, op_errno) && op_errno != ENOTEMPTY)
                         afr_transaction_fop_failed (frame, this, child_index);
                 local->op_errno = op_errno;
+                local->child_errno[child_index] = op_errno;
 
                 if (op_ret > -1)
                         __dir_entry_fop_common_cbk (frame, child_index, this,
@@ -1479,6 +1484,7 @@ afr_rename (call_frame_t *frame, xlator_t *this,
 
         local->read_child_index = afr_inode_get_read_ctx (this, oldloc->inode, NULL);
 
+        local->op = GF_FOP_RENAME;
         local->transaction.fop    = afr_rename_wind;
         local->transaction.done   = afr_rename_done;
         local->transaction.unwind = afr_rename_unwind;
@@ -1699,6 +1705,7 @@ afr_unlink (call_frame_t *frame, xlator_t *this,
         if (xdata)
                 local->xdata_req = dict_ref (xdata);
 
+        local->op = GF_FOP_UNLINK;
         local->transaction.fop    = afr_unlink_wind;
         local->transaction.done   = afr_unlink_done;
         local->transaction.unwind = afr_unlink_unwind;
@@ -1794,6 +1801,7 @@ afr_rmdir_wind_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                 if (afr_fop_failed (op_ret, op_errno) && (op_errno != ENOTEMPTY))
                         afr_transaction_fop_failed (frame, this, child_index);
                 local->op_errno = op_errno;
+                local->child_errno[child_index] = op_errno;
                 if (op_ret > -1)
                         __dir_entry_fop_common_cbk (frame, child_index, this,
                                                    op_ret, op_errno, NULL, NULL,
@@ -1899,6 +1907,7 @@ afr_rmdir (call_frame_t *frame, xlator_t *this,
         local->cont.rmdir.flags = flags;
         loc_copy (&local->loc, loc);
 
+        local->op = GF_FOP_RMDIR;
         local->transaction.fop    = afr_rmdir_wind;
         local->transaction.done   = afr_rmdir_done;
         local->transaction.unwind = afr_rmdir_unwind;
diff --git a/xlators/cluster/afr/src/afr-inode-read.c b/xlators/cluster/afr/src/afr-inode-read.c
index 051b7b164..e06e3b2f2 100644
--- a/xlators/cluster/afr/src/afr-inode-read.c
+++ b/xlators/cluster/afr/src/afr-inode-read.c
@@ -117,6 +117,8 @@ afr_access (call_frame_t *frame, xlator_t *this, loc_t *loc, int32_t mask,
 
         children = priv->children;
 
+        AFR_SBRAIN_CHECK_LOC (loc, out);
+
         AFR_LOCAL_ALLOC_OR_GOTO (frame->local, out);
         local = frame->local;
 
@@ -232,6 +234,8 @@ afr_stat (call_frame_t *frame, xlator_t *this, loc_t *loc, dict_t *xdata)
 
         children = priv->children;
 
+        AFR_SBRAIN_CHECK_LOC (loc, out);
+
         AFR_LOCAL_ALLOC_OR_GOTO (frame->local, out);
         local = frame->local;
 
@@ -348,10 +352,7 @@ afr_fstat (call_frame_t *frame, xlator_t *this,
 
         VALIDATE_OR_GOTO (fd->inode, out);
 
-        if (afr_is_split_brain (this, fd->inode)) {
-                op_errno = EIO;
-                goto out;
-        }
+        AFR_SBRAIN_CHECK_FD (fd, out);
 
         AFR_LOCAL_ALLOC_OR_GOTO (frame->local, out);
         local = frame->local;
@@ -472,6 +473,8 @@ afr_readlink (call_frame_t *frame, xlator_t *this,
 
         children = priv->children;
 
+        AFR_SBRAIN_CHECK_LOC (loc, out);
+
         AFR_LOCAL_ALLOC_OR_GOTO (frame->local, out);
         local = frame->local;
 
@@ -1323,6 +1326,62 @@ afr_getxattr_pathinfo_cbk (call_frame_t *frame, void *cookie,
         return ret;
 }
 
+static int
+afr_aggregate_stime_xattr (dict_t *this, char *key, data_t *value, void *data)
+{
+        int ret = 0;
+
+        if (fnmatch (GF_XATTR_STIME_PATTERN, key, FNM_NOESCAPE) == 0)
+                ret = gf_get_min_stime (THIS, data, key, value);
+
+        return ret;
+}
+
+int32_t
+afr_common_getxattr_stime_cbk (call_frame_t *frame, void *cookie,
+                               xlator_t *this, int32_t op_ret, int32_t op_errno,
+                               dict_t *dict, dict_t *xdata)
+{
+        afr_local_t *local          = NULL;
+        int32_t      callcnt        = 0;
+
+        if (!frame || !frame->local || !this) {
+                gf_log ("", GF_LOG_ERROR, "possible NULL deref");
+                goto out;
+        }
+
+        local = frame->local;
+
+        LOCK (&frame->lock);
+        {
+                callcnt = --local->call_count;
+
+                if (!dict || (op_ret < 0)) {
+                        local->op_errno = op_errno;
+                        goto cleanup;
+                }
+
+                if (!local->dict)
+                        local->dict = dict_copy_with_ref (dict, NULL);
+                else
+                        dict_foreach (dict, afr_aggregate_stime_xattr,
+                                      local->dict);
+                local->op_ret = 0;
+        }
+
+cleanup:
+        UNLOCK (&frame->lock);
+
+        if (!callcnt) {
+                AFR_STACK_UNWIND (getxattr, frame, local->op_ret,
+                                  local->op_errno, local->dict, xdata);
+        }
+
+out:
+        return 0;
+}
+
+
 static gf_boolean_t
 afr_is_special_xattr (const char *name, fop_getxattr_cbk_t *cbk,
                       gf_boolean_t is_fgetxattr)
@@ -1355,6 +1414,8 @@ afr_is_special_xattr (const char *name, fop_getxattr_cbk_t *cbk,
                 } else {
                         *cbk = afr_getxattr_lockinfo_cbk;
                 }
+        } else if (fnmatch (GF_XATTR_STIME_PATTERN, name, FNM_NOESCAPE) == 0) {
+                *cbk = afr_common_getxattr_stime_cbk;
         } else {
                 is_spl = _gf_false;
         }
@@ -1403,7 +1464,7 @@ afr_getxattr (call_frame_t *frame, xlator_t *this,
         int32_t                 read_child    = -1;
         int                     ret           = -1;
         fop_getxattr_cbk_t      cbk           = NULL;
-
+        int                     afr_xtime_gauge[MCNT_MAX] = {0,};
 
         VALIDATE_OR_GOTO (frame, out);
         VALIDATE_OR_GOTO (this, out);
@@ -1414,6 +1475,8 @@ afr_getxattr (call_frame_t *frame, xlator_t *this,
 
         children = priv->children;
 
+        AFR_SBRAIN_CHECK_LOC (loc, out);
+
         AFR_LOCAL_ALLOC_OR_GOTO (frame->local, out);
         local = frame->local;
 
@@ -1452,6 +1515,7 @@ afr_getxattr (call_frame_t *frame, xlator_t *this,
                                            sub_volumes,
                                            priv->child_count,
                                            MARKER_UUID_TYPE,
+                                           marker_uuid_default_gauge,
                                            priv->vol_uuid)) {
 
                         gf_log (this->name, GF_LOG_INFO,
@@ -1498,12 +1562,20 @@ afr_getxattr (call_frame_t *frame, xlator_t *this,
 
                         }
 
+                        /* don't err out on getting ENOTCONN (brick down)
+                         * from a subset of the bricks
+                         */
+                        memcpy (afr_xtime_gauge, marker_xtime_default_gauge,
+                                sizeof (afr_xtime_gauge));
+                        afr_xtime_gauge[MCNT_NOTFOUND] = 0;
+                        afr_xtime_gauge[MCNT_ENOTCONN] = 0;
                         if (cluster_getmarkerattr (frame, this, loc,
                                                    name, local,
                                                    afr_getxattr_unwind,
                                                    sub_volumes,
                                                    priv->child_count,
                                                    MARKER_XTIME_TYPE,
+                                                   afr_xtime_gauge,
                                                    priv->vol_uuid)) {
                                 gf_log (this->name, GF_LOG_INFO,
                                         "%s: failed to get marker attr (%s)",
@@ -1660,10 +1732,8 @@ afr_fgetxattr (call_frame_t *frame, xlator_t *this,
 
         children = priv->children;
 
-        if (afr_is_split_brain (this, fd->inode)) {
-                op_errno = EIO;
-                goto out;
-        }
+        AFR_SBRAIN_CHECK_FD (fd, out);
+
         AFR_LOCAL_ALLOC_OR_GOTO (local, out);
         frame->local = local;
 
@@ -1819,10 +1889,7 @@ afr_readv (call_frame_t *frame, xlator_t *this,
         priv     = this->private;
         children = priv->children;
 
-        if (afr_is_split_brain (this, fd->inode)) {
-                op_errno = EIO;
-                goto out;
-        }
+        AFR_SBRAIN_CHECK_FD (fd, out);
 
         AFR_LOCAL_ALLOC_OR_GOTO (frame->local, out);
         local = frame->local;
diff --git a/xlators/cluster/afr/src/afr-inode-write.c b/xlators/cluster/afr/src/afr-inode-write.c
index a83223569..c1ec69a55 100644
--- a/xlators/cluster/afr/src/afr-inode-write.c
+++ b/xlators/cluster/afr/src/afr-inode-write.c
@@ -39,6 +39,46 @@
 #include "afr-transaction.h"
 #include "afr-self-heal-common.h"
 
+void
+__inode_write_fop_cbk (call_frame_t *frame, int child_index, int read_child,
+                       xlator_t *this, int32_t *op_ret, int32_t *op_errno,
+                       struct iatt *prebuf, struct iatt *postbuf, dict_t *xdata)
+{
+        afr_local_t     *local = NULL;
+
+        local = frame->local;
+
+        if (afr_fop_failed (*op_ret, *op_errno)) {
+                local->child_errno[child_index] = *op_errno;
+
+                switch (local->op) {
+                case GF_FOP_TRUNCATE:
+                case GF_FOP_FTRUNCATE:
+                        if (*op_errno != EFBIG)
+                                afr_transaction_fop_failed (frame, this,
+                                                            child_index);
+                break;
+                default:
+                        afr_transaction_fop_failed (frame, this, child_index);
+                break;
+                }
+                local->op_errno = *op_errno;
+                goto out;
+        }
+
+        if ((local->success_count == 0) || (read_child == child_index)) {
+                local->op_ret              = *op_ret;
+                if (prebuf)
+                        local->cont.inode_wfop.prebuf  = *prebuf;
+                if (postbuf)
+                        local->cont.inode_wfop.postbuf = *postbuf;
+        }
+
+        local->success_count++;
+out:
+        return;
+}
+
 /* {{{ writev */
 
 void
@@ -52,8 +92,8 @@ afr_writev_copy_outvars (call_frame_t *src_frame, call_frame_t *dst_frame)
 
         dst_local->op_ret = src_local->op_ret;
         dst_local->op_errno = src_local->op_errno;
-        dst_local->cont.writev.prebuf = src_local->cont.writev.prebuf;
-        dst_local->cont.writev.postbuf = src_local->cont.writev.postbuf;
+        dst_local->cont.inode_wfop.prebuf = src_local->cont.inode_wfop.prebuf;
+        dst_local->cont.inode_wfop.postbuf = src_local->cont.inode_wfop.postbuf;
 }
 
 void
@@ -64,8 +104,8 @@ afr_writev_unwind (call_frame_t *frame, xlator_t *this)
 
         AFR_STACK_UNWIND (writev, frame,
                           local->op_ret, local->op_errno,
-                          &local->cont.writev.prebuf,
-                          &local->cont.writev.postbuf,
+                          &local->cont.inode_wfop.prebuf,
+                          &local->cont.inode_wfop.postbuf,
                           NULL);
 }
 
@@ -133,12 +173,17 @@ afr_writev_wind_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                      struct iatt *postbuf, dict_t *xdata)
 {
         afr_local_t *   local = NULL;
+        afr_private_t  *priv  = NULL;
         call_frame_t    *fop_frame = NULL;
         int child_index = (long) cookie;
         int call_count  = -1;
         int read_child  = 0;
+        int      ret = 0;
+        uint32_t open_fd_count = 0;
+        uint32_t write_is_append = 0;
 
         local = frame->local;
+        priv  = this->private;
 
         read_child = afr_inode_get_read_ctx (this, local->fd->inode, NULL);
 
@@ -148,12 +193,14 @@ afr_writev_wind_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                         local->read_child_returned = _gf_true;
                 }
 
+                __inode_write_fop_cbk (frame, child_index, read_child, this,
+                                       &op_ret, &op_errno, prebuf, postbuf,
+                                       xdata);
+
 		local->replies[child_index].valid = 1;
 		local->replies[child_index].op_ret = op_ret;
 		local->replies[child_index].op_errno = op_errno;
 
-                if (afr_fop_failed (op_ret, op_errno))
-                        afr_transaction_fop_failed (frame, this, child_index);
 
 		/* stage the best case return value for unwind */
                 if ((local->success_count == 0) || (op_ret > local->op_ret)) {
@@ -162,12 +209,24 @@ afr_writev_wind_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
 		}
 
 		if (op_ret != -1) {
-			if ((local->success_count == 0) ||
-			    (child_index == read_child)) {
-				local->cont.writev.prebuf  = *prebuf;
-				local->cont.writev.postbuf = *postbuf;
-			}
-			local->success_count++;
+                        if (xdata) {
+                                ret = dict_get_uint32 (xdata,
+                                                       GLUSTERFS_OPEN_FD_COUNT,
+                                                       &open_fd_count);
+                                if ((ret == 0) &&
+                                    (open_fd_count > local->open_fd_count)) {
+                                        local->open_fd_count = open_fd_count;
+                                        local->update_open_fd_count = _gf_true;
+                                }
+
+				write_is_append = 0;
+                                ret = dict_get_uint32 (xdata,
+                                                       GLUSTERFS_WRITE_IS_APPEND,
+                                                       &write_is_append);
+                                if (ret || !write_is_append)
+					local->append_write = _gf_false;
+                        }
+
 		}
         }
         UNLOCK (&frame->lock);
@@ -176,7 +235,23 @@ afr_writev_wind_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
 
         if (call_count == 0) {
 
+                if (local->update_open_fd_count)
+                        afr_handle_open_fd_count (frame, this);
+
+                if (!local->stable_write && !local->append_write)
+			/* An appended write removes the necessity to
+			   fsync() the file. This is because self-heal
+			   has the logic to check for larger file when
+			   the xattrs are not reliably pointing at
+			   a stale file.
+			*/
+                        afr_fd_report_unstable_write (this, local->fd);
+
                 afr_writev_handle_short_writes (frame, this);
+                if (afr_any_fops_failed (local, priv)) {
+                        //Don't unwind until post-op is complete
+                        local->transaction.resume (frame, this);
+                } else {
                 /*
                  * Generally inode-write fops do transaction.unwind then
                  * transaction.resume, but writev needs to make sure that
@@ -188,10 +263,11 @@ afr_writev_wind_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                  * completed.
                  */
 
-                fop_frame = afr_transaction_detach_fop_frame (frame);
-                afr_writev_copy_outvars (frame, fop_frame);
-                local->transaction.resume (frame, this);
-                afr_writev_unwind (fop_frame, this);
+                        fop_frame = afr_transaction_detach_fop_frame (frame);
+                        afr_writev_copy_outvars (frame, fop_frame);
+                        local->transaction.resume (frame, this);
+                        afr_writev_unwind (fop_frame, this);
+                }
         }
         return 0;
 }
@@ -203,6 +279,8 @@ afr_writev_wind (call_frame_t *frame, xlator_t *this)
         afr_private_t *priv = NULL;
         int i = 0;
         int call_count = -1;
+        dict_t *xdata = NULL;
+        GF_UNUSED int     ret = 0;
 
         local = frame->local;
         priv = this->private;
@@ -226,6 +304,19 @@ afr_writev_wind (call_frame_t *frame, xlator_t *this)
 		return 0;
 	}
 
+        xdata = dict_new ();
+        if (xdata) {
+                ret = dict_set_uint32 (xdata, GLUSTERFS_OPEN_FD_COUNT,
+                                       sizeof (uint32_t));
+		ret = dict_set_uint32 (xdata, GLUSTERFS_WRITE_IS_APPEND,
+				       0);
+		/* Set append_write to be true speculatively. If on any
+		   server it turns not be true, we unset it in the
+		   callback.
+		*/
+		local->append_write = _gf_true;
+        }
+
         for (i = 0; i < priv->child_count; i++) {
                 if (local->transaction.pre_op[i]) {
                         STACK_WIND_COOKIE (frame, afr_writev_wind_cbk,
@@ -238,13 +329,16 @@ afr_writev_wind (call_frame_t *frame, xlator_t *this)
                                            local->cont.writev.offset,
                                            local->cont.writev.flags,
                                            local->cont.writev.iobref,
-                                           NULL);
+                                           xdata);
 
                         if (!--call_count)
                                 break;
                 }
         }
 
+        if (xdata)
+                dict_unref (xdata);
+
         return 0;
 }
 
@@ -471,6 +565,11 @@ afr_writev (call_frame_t *frame, xlator_t *this, fd_t *fd,
 
         local->fd                = fd_ref (fd);
 
+	/* detect here, but set it in writev_wind_cbk *after* the unstable
+	   write is performed
+	*/
+	local->stable_write = !!((fd->flags|flags)&(O_SYNC|O_DSYNC));
+
         afr_open_fd_fix (fd, this);
 
         afr_do_writev (frame, this);
@@ -507,8 +606,8 @@ afr_truncate_unwind (call_frame_t *frame, xlator_t *this)
         if (main_frame) {
                 AFR_STACK_UNWIND (truncate, main_frame, local->op_ret,
                                   local->op_errno,
-                                  &local->cont.truncate.prebuf,
-                                  &local->cont.truncate.postbuf,
+                                  &local->cont.inode_wfop.prebuf,
+                                  &local->cont.inode_wfop.postbuf,
                                   NULL);
         }
 
@@ -522,14 +621,11 @@ afr_truncate_wind_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                        struct iatt *postbuf, dict_t *xdata)
 {
         afr_local_t *   local = NULL;
-        afr_private_t * priv  = NULL;
         int child_index = (long) cookie;
         int read_child  = 0;
         int call_count  = -1;
-        int need_unwind = 0;
 
         local = frame->local;
-        priv  = this->private;
 
         read_child = afr_inode_get_read_ctx (this, local->loc.inode, NULL);
 
@@ -539,38 +635,22 @@ afr_truncate_wind_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                         local->read_child_returned = _gf_true;
                 }
 
-                if (afr_fop_failed (op_ret, op_errno) && op_errno != EFBIG)
-                        afr_transaction_fop_failed (frame, this, child_index);
-
                 if (op_ret != -1) {
-                        if (local->success_count == 0) {
-                                local->op_ret = op_ret;
-                                local->cont.truncate.prebuf  = *prebuf;
-                                local->cont.truncate.postbuf = *postbuf;
-                        }
-
-                        if (child_index == read_child) {
-                                local->cont.truncate.prebuf  = *prebuf;
-                                local->cont.truncate.postbuf = *postbuf;
-                        }
-
-                        local->success_count++;
-
-                        if ((local->success_count >= priv->wait_count)
-                            && local->read_child_returned) {
-                                need_unwind = 1;
-                        }
+			if (prebuf->ia_size != postbuf->ia_size)
+				local->stable_write = _gf_false;
                 }
-                local->op_errno = op_errno;
+                __inode_write_fop_cbk (frame, child_index, read_child, this,
+                                       &op_ret, &op_errno, prebuf, postbuf,
+                                       xdata);
         }
         UNLOCK (&frame->lock);
 
-        if (need_unwind)
-                local->transaction.unwind (frame, this);
-
         call_count = afr_frame_return (frame);
 
         if (call_count == 0) {
+		if (local->stable_write && afr_txn_nothing_failed (frame, this))
+			local->transaction.unwind (frame, this);
+
                 local->transaction.resume (frame, this);
         }
 
@@ -598,6 +678,7 @@ afr_truncate_wind (call_frame_t *frame, xlator_t *this)
         }
 
         local->call_count = call_count;
+	local->stable_write = _gf_true;
 
         for (i = 0; i < priv->child_count; i++) {
                 if (local->transaction.pre_op[i]) {
@@ -718,8 +799,8 @@ afr_ftruncate_unwind (call_frame_t *frame, xlator_t *this)
         if (main_frame) {
                 AFR_STACK_UNWIND (ftruncate, main_frame, local->op_ret,
                                   local->op_errno,
-                                  &local->cont.ftruncate.prebuf,
-                                  &local->cont.ftruncate.postbuf,
+                                  &local->cont.inode_wfop.prebuf,
+                                  &local->cont.inode_wfop.postbuf,
                                   NULL);
         }
         return 0;
@@ -732,14 +813,11 @@ afr_ftruncate_wind_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                         struct iatt *postbuf, dict_t *xdata)
 {
         afr_local_t *   local = NULL;
-        afr_private_t * priv  = NULL;
         int child_index = (long) cookie;
         int call_count  = -1;
-        int need_unwind = 0;
         int read_child  = 0;
 
         local = frame->local;
-        priv  = this->private;
 
         read_child = afr_inode_get_read_ctx (this, local->fd->inode, NULL);
 
@@ -749,38 +827,22 @@ afr_ftruncate_wind_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                         local->read_child_returned = _gf_true;
                 }
 
-                if (afr_fop_failed (op_ret, op_errno))
-                        afr_transaction_fop_failed (frame, this, child_index);
-
                 if (op_ret != -1) {
-                        if (local->success_count == 0) {
-                                local->op_ret = op_ret;
-                                local->cont.ftruncate.prebuf  = *prebuf;
-                                local->cont.ftruncate.postbuf = *postbuf;
-                        }
-
-                        if (child_index == read_child) {
-                                local->cont.ftruncate.prebuf  = *prebuf;
-                                local->cont.ftruncate.postbuf = *postbuf;
-                        }
-
-                        local->success_count++;
-
-                        if ((local->success_count >= priv->wait_count)
-                            && local->read_child_returned) {
-                                need_unwind = 1;
-                        }
+			if (prebuf->ia_size != postbuf->ia_size)
+				local->stable_write = _gf_false;
                 }
-                local->op_errno = op_errno;
+                __inode_write_fop_cbk (frame, child_index, read_child, this,
+                                       &op_ret, &op_errno, prebuf, postbuf,
+                                       xdata);
         }
         UNLOCK (&frame->lock);
 
-        if (need_unwind)
-                local->transaction.unwind (frame, this);
-
         call_count = afr_frame_return (frame);
 
         if (call_count == 0) {
+		if (local->stable_write && afr_txn_nothing_failed (frame, this))
+			local->transaction.unwind (frame, this);
+
                 local->transaction.resume (frame, this);
         }
 
@@ -808,6 +870,7 @@ afr_ftruncate_wind (call_frame_t *frame, xlator_t *this)
         }
 
         local->call_count = call_count;
+	local->stable_write = _gf_true;
 
         for (i = 0; i < priv->child_count; i++) {
                 if (local->transaction.pre_op[i]) {
@@ -962,8 +1025,8 @@ afr_setattr_unwind (call_frame_t *frame, xlator_t *this)
         if (main_frame) {
                 AFR_STACK_UNWIND (setattr, main_frame, local->op_ret,
                                   local->op_errno,
-                                  &local->cont.setattr.preop_buf,
-                                  &local->cont.setattr.postop_buf,
+                                  &local->cont.inode_wfop.prebuf,
+                                  &local->cont.inode_wfop.postbuf,
                                   NULL);
         }
 
@@ -994,29 +1057,14 @@ afr_setattr_wind_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                         local->read_child_returned = _gf_true;
                 }
 
-                if (afr_fop_failed (op_ret, op_errno))
-                        afr_transaction_fop_failed (frame, this, child_index);
-
-                if (op_ret != -1) {
-                        if (local->success_count == 0) {
-                                local->op_ret = op_ret;
-                                local->cont.setattr.preop_buf  = *preop;
-                                local->cont.setattr.postop_buf = *postop;
-                        }
+                __inode_write_fop_cbk (frame, child_index, read_child, this,
+                                       &op_ret, &op_errno, preop, postop,
+                                       xdata);
 
-                        if (child_index == read_child) {
-                                local->cont.setattr.preop_buf  = *preop;
-                                local->cont.setattr.postop_buf = *postop;
-                        }
-
-                        local->success_count++;
-
-                        if ((local->success_count >= priv->wait_count)
-                            && local->read_child_returned) {
-                                need_unwind = 1;
-                        }
+                if ((local->success_count >= priv->wait_count)
+                    && local->read_child_returned) {
+                        need_unwind = 1;
                 }
-                local->op_errno = op_errno;
         }
         UNLOCK (&frame->lock);
 
@@ -1171,8 +1219,8 @@ afr_fsetattr_unwind (call_frame_t *frame, xlator_t *this)
         if (main_frame) {
                 AFR_STACK_UNWIND (fsetattr, main_frame, local->op_ret,
                                   local->op_errno,
-                                  &local->cont.fsetattr.preop_buf,
-                                  &local->cont.fsetattr.postop_buf,
+                                  &local->cont.inode_wfop.prebuf,
+                                  &local->cont.inode_wfop.postbuf,
                                   NULL);
         }
 
@@ -1203,29 +1251,14 @@ afr_fsetattr_wind_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                         local->read_child_returned = _gf_true;
                 }
 
-                if (afr_fop_failed (op_ret, op_errno))
-                        afr_transaction_fop_failed (frame, this, child_index);
-
-                if (op_ret != -1) {
-                        if (local->success_count == 0) {
-                                local->op_ret = op_ret;
-                                local->cont.fsetattr.preop_buf  = *preop;
-                                local->cont.fsetattr.postop_buf = *postop;
-                        }
+                __inode_write_fop_cbk (frame, child_index, read_child, this,
+                                       &op_ret, &op_errno, preop, postop,
+                                       xdata);
 
-                        if (child_index == read_child) {
-                                local->cont.fsetattr.preop_buf  = *preop;
-                                local->cont.fsetattr.postop_buf = *postop;
-                        }
-
-                        local->success_count++;
-
-                        if ((local->success_count >= priv->wait_count)
-                            && local->read_child_returned) {
-                                need_unwind = 1;
-                        }
+                if ((local->success_count >= priv->wait_count)
+                    && local->read_child_returned) {
+                        need_unwind = 1;
                 }
-                local->op_errno = op_errno;
         }
         UNLOCK (&frame->lock);
 
@@ -1398,28 +1431,23 @@ int
 afr_setxattr_wind_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                        int32_t op_ret, int32_t op_errno, dict_t *xdata)
 {
-        afr_local_t      *local         = NULL;
-        afr_private_t    *priv          = NULL;
-        int               call_count    = -1;
-        int               need_unwind   = 0;
+        afr_local_t   *local      = NULL;
+        afr_private_t *priv       = NULL;
+        int           call_count  = -1;
+        int           need_unwind = 0;
+        int           child_index = (long) cookie;
 
         local = frame->local;
         priv = this->private;
 
         LOCK (&frame->lock);
         {
-                if (op_ret != -1) {
-                        if (local->success_count == 0) {
-                                local->op_ret = op_ret;
-                        }
-                        local->success_count++;
-
-                        if (local->success_count == priv->child_count) {
-                                need_unwind = 1;
-                        }
+                __inode_write_fop_cbk (frame, child_index, -1, this,
+                                       &op_ret, &op_errno, NULL, NULL,
+                                       xdata);
+                if (local->success_count == priv->child_count) {
+                        need_unwind = 1;
                 }
-
-                local->op_errno = op_errno;
         }
         UNLOCK (&frame->lock);
 
@@ -1588,28 +1616,24 @@ int
 afr_fsetxattr_wind_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                         int32_t op_ret, int32_t op_errno, dict_t *xdata)
 {
-        afr_local_t     *local       = NULL;
-        afr_private_t   *priv        = NULL;
-        int              call_count  = -1;
-        int              need_unwind = 0;
+        afr_local_t   *local      = NULL;
+        afr_private_t *priv       = NULL;
+        int           call_count  = -1;
+        int           need_unwind = 0;
+        int           child_index = (long) cookie;
 
         local = frame->local;
         priv = this->private;
 
         LOCK (&frame->lock);
         {
-                if (op_ret != -1) {
-                        if (local->success_count == 0) {
-                                local->op_ret = op_ret;
-                        }
-                        local->success_count++;
 
-                        if (local->success_count == priv->child_count) {
-                                need_unwind = 1;
-                        }
+                __inode_write_fop_cbk (frame, child_index, -1, this,
+                                       &op_ret, &op_errno, NULL, NULL,
+                                       xdata);
+                if (local->success_count == priv->child_count) {
+                        need_unwind = 1;
                 }
-
-                local->op_errno = op_errno;
         }
         UNLOCK (&frame->lock);
 
@@ -1788,28 +1812,23 @@ int
 afr_removexattr_wind_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                           int32_t op_ret, int32_t op_errno, dict_t *xdata)
 {
-        afr_local_t *   local = NULL;
-        afr_private_t * priv  = NULL;
-        int call_count  = -1;
-        int need_unwind = 0;
+        afr_local_t   *local      = NULL;
+        afr_private_t *priv       = NULL;
+        int           call_count  = -1;
+        int           need_unwind = 0;
+        int           child_index = (long) cookie;
 
         local = frame->local;
         priv = this->private;
 
         LOCK (&frame->lock);
         {
-                if (op_ret != -1) {
-                        if (local->success_count == 0) {
-                                local->op_ret = op_ret;
-                        }
-                        local->success_count++;
-
-                        if (local->success_count == priv->wait_count) {
-                                need_unwind = 1;
-                        }
+                __inode_write_fop_cbk (frame, child_index, -1, this,
+                                       &op_ret, &op_errno, NULL, NULL,
+                                       xdata);
+                if (local->success_count == priv->wait_count) {
+                        need_unwind = 1;
                 }
-
-                local->op_errno = op_errno;
         }
         UNLOCK (&frame->lock);
 
@@ -1977,28 +1996,24 @@ int
 afr_fremovexattr_wind_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                           int32_t op_ret, int32_t op_errno, dict_t *xdata)
 {
-        afr_local_t *   local = NULL;
-        afr_private_t * priv  = NULL;
-        int call_count  = -1;
-        int need_unwind = 0;
+        afr_local_t *   local       = NULL;
+        afr_private_t * priv        = NULL;
+        int             call_count  = -1;
+        int             need_unwind = 0;
+        int             child_index = (long) cookie;
 
         local = frame->local;
         priv = this->private;
 
         LOCK (&frame->lock);
         {
-                if (op_ret != -1) {
-                        if (local->success_count == 0) {
-                                local->op_ret = op_ret;
-                        }
-                        local->success_count++;
+                __inode_write_fop_cbk (frame, child_index, -1, this,
+                                       &op_ret, &op_errno, NULL, NULL,
+                                       xdata);
 
-                        if (local->success_count == priv->wait_count) {
-                                need_unwind = 1;
-                        }
+                if (local->success_count == priv->wait_count) {
+                        need_unwind = 1;
                 }
-
-                local->op_errno = op_errno;
         }
         UNLOCK (&frame->lock);
 
@@ -2143,3 +2158,704 @@ out:
 
         return 0;
 }
+
+static int
+afr_fallocate_unwind (call_frame_t *frame, xlator_t *this)
+{
+        afr_local_t *   local = NULL;
+        call_frame_t   *main_frame = NULL;
+
+        local = frame->local;
+
+        LOCK (&frame->lock);
+        {
+                if (local->transaction.main_frame)
+                        main_frame = local->transaction.main_frame;
+                local->transaction.main_frame = NULL;
+        }
+        UNLOCK (&frame->lock);
+
+        if (main_frame) {
+                AFR_STACK_UNWIND (fallocate, main_frame, local->op_ret,
+                                  local->op_errno,
+                                  &local->cont.inode_wfop.prebuf,
+                                  &local->cont.inode_wfop.postbuf,
+                                  NULL);
+        }
+        return 0;
+}
+
+static int
+afr_fallocate_wind_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                        int32_t op_ret, int32_t op_errno, struct iatt *prebuf,
+                        struct iatt *postbuf, dict_t *xdata)
+{
+        afr_local_t *   local = NULL;
+        afr_private_t * priv  = NULL;
+        int child_index = (long) cookie;
+        int call_count  = -1;
+        int need_unwind = 0;
+        int read_child  = 0;
+
+        local = frame->local;
+        priv  = this->private;
+
+        read_child = afr_inode_get_read_ctx (this, local->fd->inode, NULL);
+
+        LOCK (&frame->lock);
+        {
+                if (child_index == read_child) {
+                        local->read_child_returned = _gf_true;
+                }
+
+                __inode_write_fop_cbk (frame, child_index, read_child, this,
+                                       &op_ret, &op_errno, prebuf, postbuf,
+                                       xdata);
+
+                if ((local->success_count >= priv->wait_count)
+                    && local->read_child_returned) {
+                        need_unwind = 1;
+                }
+        }
+        UNLOCK (&frame->lock);
+
+        if (need_unwind)
+                local->transaction.unwind (frame, this);
+
+        call_count = afr_frame_return (frame);
+
+        if (call_count == 0) {
+                local->transaction.resume (frame, this);
+        }
+
+        return 0;
+}
+
+static int
+afr_fallocate_wind (call_frame_t *frame, xlator_t *this)
+{
+        afr_local_t *local = NULL;
+        afr_private_t *priv = NULL;
+        int call_count = -1;
+        int i = 0;
+
+        local = frame->local;
+        priv = this->private;
+
+        call_count = afr_pre_op_done_children_count (local->transaction.pre_op,
+                                                     priv->child_count);
+
+        if (call_count == 0) {
+                local->transaction.resume (frame, this);
+                return 0;
+        }
+
+        local->call_count = call_count;
+
+        for (i = 0; i < priv->child_count; i++) {
+                if (local->transaction.pre_op[i]) {
+                        STACK_WIND_COOKIE (frame, afr_fallocate_wind_cbk,
+                                           (void *) (long) i,
+                                           priv->children[i],
+                                           priv->children[i]->fops->fallocate,
+                                           local->fd,
+                                           local->cont.fallocate.mode,
+                                           local->cont.fallocate.offset,
+                                           local->cont.fallocate.len,
+                                           NULL);
+
+                        if (!--call_count)
+                                break;
+                }
+        }
+
+        return 0;
+}
+
+static int
+afr_fallocate_done (call_frame_t *frame, xlator_t *this)
+{
+        afr_local_t *local = NULL;
+
+        local = frame->local;
+
+        local->transaction.unwind (frame, this);
+
+        AFR_STACK_DESTROY (frame);
+
+        return 0;
+}
+
+static int
+afr_do_fallocate (call_frame_t *frame, xlator_t *this)
+{
+        call_frame_t * transaction_frame = NULL;
+        afr_local_t *  local             = NULL;
+        int op_ret   = -1;
+        int op_errno = 0;
+
+        local = frame->local;
+
+        transaction_frame = copy_frame (frame);
+        if (!transaction_frame) {
+                goto out;
+        }
+
+        transaction_frame->local = local;
+        frame->local = NULL;
+
+        local->op = GF_FOP_FALLOCATE;
+
+        local->transaction.fop    = afr_fallocate_wind;
+        local->transaction.done   = afr_fallocate_done;
+        local->transaction.unwind = afr_fallocate_unwind;
+
+        local->transaction.main_frame = frame;
+
+        local->transaction.start   = local->cont.fallocate.offset;
+        local->transaction.len     = 0;
+
+        /* fallocate can modify the file size */
+        op_ret = afr_transaction (transaction_frame, this, AFR_DATA_TRANSACTION);
+        if (op_ret < 0) {
+            op_errno = -op_ret;
+            goto out;
+        }
+
+        op_ret = 0;
+out:
+        if (op_ret < 0) {
+                if (transaction_frame)
+                        AFR_STACK_DESTROY (transaction_frame);
+                AFR_STACK_UNWIND (fallocate, frame, op_ret, op_errno, NULL,
+                                  NULL, NULL);
+        }
+
+        return 0;
+}
+
+int
+afr_fallocate (call_frame_t *frame, xlator_t *this, fd_t *fd, int32_t mode,
+               off_t offset, size_t len, dict_t *xdata)
+{
+        afr_private_t * priv  = NULL;
+        afr_local_t   * local = NULL;
+        call_frame_t   *transaction_frame = NULL;
+        int ret = -1;
+        int op_errno = 0;
+
+        VALIDATE_OR_GOTO (frame, out);
+        VALIDATE_OR_GOTO (this, out);
+        VALIDATE_OR_GOTO (this->private, out);
+
+        priv = this->private;
+
+        if (afr_is_split_brain (this, fd->inode)) {
+                op_errno = EIO;
+                goto out;
+        }
+        QUORUM_CHECK(fallocate,out);
+
+        AFR_LOCAL_ALLOC_OR_GOTO (frame->local, out);
+        local = frame->local;
+
+        ret = afr_local_init (local, priv, &op_errno);
+        if (ret < 0)
+                goto out;
+
+        local->cont.fallocate.mode = mode;
+        local->cont.fallocate.offset  = offset;
+        local->cont.fallocate.len = len;
+
+        local->fd = fd_ref (fd);
+
+        afr_open_fd_fix (fd, this);
+
+        afr_do_fallocate (frame, this);
+
+        ret = 0;
+out:
+        if (ret < 0) {
+                if (transaction_frame)
+                        AFR_STACK_DESTROY (transaction_frame);
+                AFR_STACK_UNWIND (fallocate, frame, -1, op_errno, NULL, NULL, NULL);
+        }
+
+        return 0;
+}
+
+/* }}} */
+
+/* {{{ discard */
+
+static int
+afr_discard_unwind (call_frame_t *frame, xlator_t *this)
+{
+        afr_local_t *   local = NULL;
+        call_frame_t   *main_frame = NULL;
+
+        local = frame->local;
+
+        LOCK (&frame->lock);
+        {
+                if (local->transaction.main_frame)
+                        main_frame = local->transaction.main_frame;
+                local->transaction.main_frame = NULL;
+        }
+        UNLOCK (&frame->lock);
+
+        if (main_frame) {
+                AFR_STACK_UNWIND (discard, main_frame, local->op_ret,
+                                  local->op_errno,
+                                  &local->cont.inode_wfop.prebuf,
+                                  &local->cont.inode_wfop.postbuf,
+                                  NULL);
+        }
+        return 0;
+}
+
+static int
+afr_discard_wind_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                      int32_t op_ret, int32_t op_errno, struct iatt *prebuf,
+                      struct iatt *postbuf, dict_t *xdata)
+{
+        afr_local_t *   local = NULL;
+        afr_private_t * priv  = NULL;
+        int child_index = (long) cookie;
+        int call_count  = -1;
+        int need_unwind = 0;
+        int read_child  = 0;
+
+        local = frame->local;
+        priv  = this->private;
+
+        read_child = afr_inode_get_read_ctx (this, local->fd->inode, NULL);
+
+        LOCK (&frame->lock);
+        {
+                if (child_index == read_child) {
+                        local->read_child_returned = _gf_true;
+                }
+
+                __inode_write_fop_cbk (frame, child_index, read_child, this,
+                                       &op_ret, &op_errno, prebuf, postbuf,
+                                       xdata);
+
+                if ((local->success_count >= priv->wait_count)
+                    && local->read_child_returned) {
+                        need_unwind = 1;
+                }
+        }
+        UNLOCK (&frame->lock);
+
+        if (need_unwind)
+                local->transaction.unwind (frame, this);
+
+        call_count = afr_frame_return (frame);
+
+        if (call_count == 0) {
+                local->transaction.resume (frame, this);
+        }
+
+        return 0;
+}
+
+static int
+afr_discard_wind (call_frame_t *frame, xlator_t *this)
+{
+        afr_local_t *local = NULL;
+        afr_private_t *priv = NULL;
+        int call_count = -1;
+        int i = 0;
+
+        local = frame->local;
+        priv = this->private;
+
+        call_count = afr_pre_op_done_children_count (local->transaction.pre_op,
+                                                     priv->child_count);
+
+        if (call_count == 0) {
+                local->transaction.resume (frame, this);
+                return 0;
+        }
+
+        local->call_count = call_count;
+
+        for (i = 0; i < priv->child_count; i++) {
+                if (local->transaction.pre_op[i]) {
+                        STACK_WIND_COOKIE (frame, afr_discard_wind_cbk,
+                                           (void *) (long) i,
+                                           priv->children[i],
+                                           priv->children[i]->fops->discard,
+                                           local->fd,
+                                           local->cont.discard.offset,
+                                           local->cont.discard.len,
+                                           NULL);
+
+                        if (!--call_count)
+                                break;
+                }
+        }
+
+        return 0;
+}
+
+static int
+afr_discard_done (call_frame_t *frame, xlator_t *this)
+{
+        afr_local_t *local = NULL;
+
+        local = frame->local;
+
+        local->transaction.unwind (frame, this);
+
+        AFR_STACK_DESTROY (frame);
+
+        return 0;
+}
+
+static int
+afr_do_discard (call_frame_t *frame, xlator_t *this)
+{
+        call_frame_t * transaction_frame = NULL;
+        afr_local_t *  local             = NULL;
+        int op_ret   = -1;
+        int op_errno = 0;
+
+        local = frame->local;
+
+        transaction_frame = copy_frame (frame);
+        if (!transaction_frame) {
+                goto out;
+        }
+
+        transaction_frame->local = local;
+        frame->local = NULL;
+
+        local->op = GF_FOP_DISCARD;
+
+        local->transaction.fop    = afr_discard_wind;
+        local->transaction.done   = afr_discard_done;
+        local->transaction.unwind = afr_discard_unwind;
+
+        local->transaction.main_frame = frame;
+
+        local->transaction.start   = local->cont.discard.offset;
+        local->transaction.len     = 0;
+
+        op_ret = afr_transaction (transaction_frame, this, AFR_DATA_TRANSACTION);
+        if (op_ret < 0) {
+            op_errno = -op_ret;
+            goto out;
+        }
+
+        op_ret = 0;
+out:
+        if (op_ret < 0) {
+                if (transaction_frame)
+                        AFR_STACK_DESTROY (transaction_frame);
+                AFR_STACK_UNWIND (discard, frame, op_ret, op_errno, NULL,
+                                  NULL, NULL);
+        }
+
+        return 0;
+}
+
+int
+afr_discard (call_frame_t *frame, xlator_t *this, fd_t *fd, off_t offset,
+             size_t len, dict_t *xdata)
+{
+        afr_private_t * priv  = NULL;
+        afr_local_t   * local = NULL;
+        call_frame_t   *transaction_frame = NULL;
+        int ret = -1;
+        int op_errno = 0;
+
+        VALIDATE_OR_GOTO (frame, out);
+        VALIDATE_OR_GOTO (this, out);
+        VALIDATE_OR_GOTO (this->private, out);
+
+        priv = this->private;
+
+        if (afr_is_split_brain (this, fd->inode)) {
+                op_errno = EIO;
+                goto out;
+        }
+        QUORUM_CHECK(discard, out);
+
+        AFR_LOCAL_ALLOC_OR_GOTO (frame->local, out);
+        local = frame->local;
+
+        ret = afr_local_init (local, priv, &op_errno);
+        if (ret < 0)
+                goto out;
+
+        local->cont.discard.offset  = offset;
+        local->cont.discard.len = len;
+
+        local->fd = fd_ref (fd);
+
+        afr_open_fd_fix (fd, this);
+
+        afr_do_discard(frame, this);
+
+        ret = 0;
+out:
+        if (ret < 0) {
+                if (transaction_frame)
+                        AFR_STACK_DESTROY (transaction_frame);
+                AFR_STACK_UNWIND (discard, frame, -1, op_errno, NULL, NULL, NULL);
+        }
+
+        return 0;
+}
+
+
+/* {{{ zerofill */
+
+static int
+afr_zerofill_unwind (call_frame_t *frame, xlator_t *this)
+{
+        afr_local_t     *local            = NULL;
+        call_frame_t    *main_frame       = NULL;
+
+        local = frame->local;
+
+        LOCK (&frame->lock);
+        {
+                if (local->transaction.main_frame) {
+                        main_frame = local->transaction.main_frame;
+                }
+                local->transaction.main_frame = NULL;
+        }
+        UNLOCK (&frame->lock);
+
+        if (main_frame) {
+                AFR_STACK_UNWIND (zerofill, main_frame, local->op_ret,
+                                  local->op_errno,
+                                  &local->cont.zerofill.prebuf,
+                                  &local->cont.zerofill.postbuf,
+                                  NULL);
+        }
+        return 0;
+}
+
+static int
+afr_zerofill_wind_cbk(call_frame_t *frame, void *cookie, xlator_t *this,
+                     int32_t op_ret, int32_t op_errno, struct iatt *prebuf,
+                     struct iatt *postbuf, dict_t *xdata)
+{
+        afr_local_t       *local             = NULL;
+        afr_private_t     *priv              = NULL;
+        int                child_index       = (long) cookie;
+        int                call_count        = -1;
+        int                need_unwind       = 0;
+        int                read_child        = 0;
+
+        local = frame->local;
+        priv  = this->private;
+
+        read_child = afr_inode_get_read_ctx (this, local->fd->inode, NULL);
+
+        LOCK (&frame->lock);
+        {
+                if (child_index == read_child) {
+                        local->read_child_returned = _gf_true;
+                }
+
+                if (afr_fop_failed (op_ret, op_errno)) {
+                        afr_transaction_fop_failed (frame, this, child_index);
+                }
+
+                if (op_ret != -1) {
+                        if (local->success_count == 0) {
+                                local->op_ret = op_ret;
+                                local->cont.zerofill.prebuf  = *prebuf;
+                                local->cont.zerofill.postbuf = *postbuf;
+                        }
+
+                        if (child_index == read_child) {
+                                local->cont.zerofill.prebuf  = *prebuf;
+                                local->cont.zerofill.postbuf = *postbuf;
+                        }
+
+                        local->success_count++;
+
+                        if ((local->success_count >= priv->wait_count)
+                            && local->read_child_returned) {
+                                need_unwind = 1;
+                        }
+                }
+                local->op_errno = op_errno;
+        }
+        UNLOCK (&frame->lock);
+
+        if (need_unwind) {
+                local->transaction.unwind (frame, this);
+        }
+        call_count = afr_frame_return (frame);
+
+        if (call_count == 0) {
+                local->transaction.resume (frame, this);
+        }
+
+        return 0;
+}
+
+static int
+afr_zerofill_wind (call_frame_t *frame, xlator_t *this)
+{
+        afr_local_t    *local         = NULL;
+        afr_private_t  *priv          = NULL;
+        int             call_count    = -1;
+        int             i             = 0;
+
+        local = frame->local;
+        priv = this->private;
+
+        call_count = afr_pre_op_done_children_count (local->transaction.pre_op,
+                                                     priv->child_count);
+
+        if (call_count == 0) {
+                local->transaction.resume (frame, this);
+                return 0;
+        }
+
+        local->call_count = call_count;
+
+        for (i = 0; i < priv->child_count; i++) {
+                if (local->transaction.pre_op[i]) {
+                        STACK_WIND_COOKIE (frame, afr_zerofill_wind_cbk,
+                                           (void *) (long) i,
+                                           priv->children[i],
+                                           priv->children[i]->fops->zerofill,
+                                           local->fd,
+                                           local->cont.zerofill.offset,
+                                           local->cont.zerofill.len,
+                                           NULL);
+
+                        if (!--call_count)
+                                break;
+                }
+        }
+
+        return 0;
+}
+
+static int
+afr_zerofill_done (call_frame_t *frame, xlator_t *this)
+{
+        afr_local_t *local = NULL;
+
+        local = frame->local;
+
+        local->transaction.unwind (frame, this);
+
+        AFR_STACK_DESTROY (frame);
+
+        return 0;
+}
+
+static int
+afr_do_zerofill(call_frame_t *frame, xlator_t *this)
+{
+        call_frame_t  *transaction_frame = NULL;
+        afr_local_t   *local             = NULL;
+        int            op_ret            = -1;
+        int            op_errno          = 0;
+
+        local = frame->local;
+
+        transaction_frame = copy_frame (frame);
+        if (!transaction_frame) {
+                goto out;
+        }
+
+        transaction_frame->local = local;
+        frame->local = NULL;
+
+        local->op = GF_FOP_ZEROFILL;
+
+        local->transaction.fop    = afr_zerofill_wind;
+        local->transaction.done   = afr_zerofill_done;
+        local->transaction.unwind = afr_zerofill_unwind;
+
+        local->transaction.main_frame = frame;
+
+        local->transaction.start   = local->cont.zerofill.offset;
+        local->transaction.len     = 0;
+
+        op_ret = afr_transaction (transaction_frame, this,
+                                  AFR_DATA_TRANSACTION);
+        if (op_ret < 0) {
+                op_errno = -op_ret;
+                goto out;
+        }
+
+        op_ret = 0;
+out:
+        if (op_ret < 0) {
+                if (transaction_frame) {
+                        AFR_STACK_DESTROY (transaction_frame);
+                }
+                AFR_STACK_UNWIND (zerofill, frame, op_ret, op_errno, NULL,
+                                  NULL, NULL);
+        }
+
+        return 0;
+}
+
+int
+afr_zerofill (call_frame_t *frame, xlator_t *this, fd_t *fd, off_t offset,
+              size_t len, dict_t *xdata)
+{
+        afr_private_t   *priv               = NULL;
+        afr_local_t     *local              = NULL;
+        call_frame_t    *transaction_frame  = NULL;
+        int              ret                = -1;
+        int              op_errno           = 0;
+
+        VALIDATE_OR_GOTO (frame, out);
+        VALIDATE_OR_GOTO (this, out);
+        VALIDATE_OR_GOTO (this->private, out);
+
+        priv = this->private;
+
+        if (afr_is_split_brain (this, fd->inode)) {
+                op_errno = EIO;
+                goto out;
+        }
+        QUORUM_CHECK(zerofill, out);
+
+        AFR_LOCAL_ALLOC_OR_GOTO (frame->local, out);
+        local = frame->local;
+
+        ret = afr_local_init (local, priv, &op_errno);
+        if (ret < 0) {
+                goto out;
+        }
+        local->cont.zerofill.offset  = offset;
+        local->cont.zerofill.len = len;
+
+        local->fd = fd_ref (fd);
+
+        afr_open_fd_fix (fd, this);
+
+        afr_do_zerofill(frame, this);
+
+        ret = 0;
+out:
+        if (ret < 0) {
+                if (transaction_frame) {
+                        AFR_STACK_DESTROY (transaction_frame);
+                }
+                AFR_STACK_UNWIND (zerofill, frame, -1, op_errno, NULL,
+                                  NULL, NULL);
+        }
+
+        return 0;
+}
+
+/* }}} */
+
+
diff --git a/xlators/cluster/afr/src/afr-inode-write.h b/xlators/cluster/afr/src/afr-inode-write.h
index ed11079fd..8e93ca44a 100644
--- a/xlators/cluster/afr/src/afr-inode-write.h
+++ b/xlators/cluster/afr/src/afr-inode-write.h
@@ -68,4 +68,15 @@ int32_t
 afr_fremovexattr (call_frame_t *frame, xlator_t *this,
                   fd_t *fd, const char *name, dict_t *xdata);
 
+int
+afr_discard (call_frame_t *frame, xlator_t *this, fd_t *fd, off_t offset,
+             size_t len, dict_t *xdata);
+
+int
+afr_fallocate (call_frame_t *frame, xlator_t *this, fd_t *fd, int32_t mode,
+               off_t offset, size_t len, dict_t *xdata);
+
+int
+afr_zerofill(call_frame_t *frame, xlator_t *this, fd_t *fd, off_t offset,
+             size_t len, dict_t *xdata);
 #endif /* __INODE_WRITE_H__ */
diff --git a/xlators/cluster/afr/src/afr-lk-common.c b/xlators/cluster/afr/src/afr-lk-common.c
index e091a7939..060d78f35 100644
--- a/xlators/cluster/afr/src/afr-lk-common.c
+++ b/xlators/cluster/afr/src/afr-lk-common.c
@@ -57,11 +57,15 @@
 int
 afr_entry_lockee_cmp (const void *l1, const void *l2)
 {
-       const afr_entry_lockee_t       *r1 = l1;
-       const afr_entry_lockee_t       *r2 = l2;
-       int                            ret = 0;
-
-        ret = uuid_compare (r1->loc.gfid, r2->loc.gfid);
+        const afr_entry_lockee_t       *r1 = l1;
+        const afr_entry_lockee_t       *r2 = l2;
+        int                            ret = 0;
+        uuid_t                         gfid1 = {0};
+        uuid_t                         gfid2 = {0};
+
+        loc_gfid ((loc_t*)&r1->loc, gfid1);
+        loc_gfid ((loc_t*)&r2->loc, gfid2);
+        ret = uuid_compare (gfid1, gfid2);
         /*Entrylks with NULL basename are the 'smallest'*/
         if (ret == 0) {
                 if (!r1->basename)
@@ -75,7 +79,6 @@ afr_entry_lockee_cmp (const void *l1, const void *l2)
                 return -1;
         else
                 return 1;
-
 }
 
 int afr_lock_blocking (call_frame_t *frame, xlator_t *this, int child_index);
@@ -556,19 +559,23 @@ initialize_inodelk_variables (call_frame_t *frame, xlator_t *this)
         afr_local_t         *local    = NULL;
         afr_internal_lock_t *int_lock = NULL;
         afr_private_t       *priv     = NULL;
-        int i = 0;
+        afr_inodelk_t       *inodelk  = NULL;
 
         priv     = this->private;
         local    = frame->local;
         int_lock = &local->internal_lock;
 
-        int_lock->inodelk_lock_count = 0;
-        int_lock->lock_op_ret        = -1;
-        int_lock->lock_op_errno      = 0;
+        inodelk = afr_get_inodelk (int_lock, int_lock->domain);
 
-        for (i = 0; i < priv->child_count; i++) {
-                int_lock->inode_locked_nodes[i] = 0;
-        }
+        inodelk->lock_count    = 0;
+        int_lock->lk_attempted_count = 0;
+        int_lock->lock_op_ret   = -1;
+        int_lock->lock_op_errno = 0;
+
+        memset (inodelk->locked_nodes, 0,
+                sizeof (*inodelk->locked_nodes) * priv->child_count);
+        memset (int_lock->locked_nodes, 0,
+                sizeof (*int_lock->locked_nodes) * priv->child_count);
 
         return 0;
 }
@@ -649,7 +656,9 @@ afr_unlock_inodelk_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
 {
         afr_local_t         *local = NULL;
         afr_internal_lock_t *int_lock = NULL;
+        afr_inodelk_t       *inodelk = NULL;
         int32_t             child_index = (long)cookie;
+        afr_private_t       *priv = NULL;
 
         local = frame->local;
         int_lock = &local->internal_lock;
@@ -658,14 +667,18 @@ afr_unlock_inodelk_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                                AFR_UNLOCK_OP, NULL, op_ret,
                                op_errno, child_index);
 
+        priv = this->private;
+
         if (op_ret < 0 && op_errno != ENOTCONN && op_errno != EBADFD) {
-                gf_log (this->name, GF_LOG_INFO, "%s: unlock failed on %d "
-                        "unlock by %s", local->loc.path, child_index,
+                gf_log (this->name, GF_LOG_INFO, "%s: unlock failed on subvolume %s "
+                        "with lock owner %s", local->loc.path,
+                        priv->children[child_index]->name,
                         lkowner_utoa (&frame->root->lk_owner));
         }
 
 
-        int_lock->inode_locked_nodes[child_index] &= LOCKED_NO;
+        inodelk = afr_get_inodelk (int_lock, int_lock->domain);
+        inodelk->locked_nodes[child_index] &= LOCKED_NO;
         if (local->transaction.eager_lock)
                 local->transaction.eager_lock[child_index] = 0;
 
@@ -679,6 +692,7 @@ static int
 afr_unlock_inodelk (call_frame_t *frame, xlator_t *this)
 {
         afr_internal_lock_t *int_lock = NULL;
+        afr_inodelk_t       *inodelk  = NULL;
         afr_local_t         *local    = NULL;
         afr_private_t       *priv     = NULL;
         struct gf_flock flock = {0,};
@@ -694,12 +708,14 @@ afr_unlock_inodelk (call_frame_t *frame, xlator_t *this)
         int_lock = &local->internal_lock;
         priv     = this->private;
 
-        flock.l_start = int_lock->lk_flock.l_start;
-        flock.l_len   = int_lock->lk_flock.l_len;
+        inodelk = afr_get_inodelk (int_lock, int_lock->domain);
+
+        flock.l_start = inodelk->flock.l_start;
+        flock.l_len   = inodelk->flock.l_len;
         flock.l_type  = F_UNLCK;
 
         full_flock.l_type = F_UNLCK;
-        call_count = afr_locked_nodes_count (int_lock->inode_locked_nodes,
+        call_count = afr_locked_nodes_count (inodelk->locked_nodes,
                                              priv->child_count);
 
         int_lock->lk_call_count = call_count;
@@ -715,8 +731,7 @@ afr_unlock_inodelk (call_frame_t *frame, xlator_t *this)
                 fd_ctx = afr_fd_ctx_get (local->fd, this);
 
         for (i = 0; i < priv->child_count; i++) {
-                if ((int_lock->inode_locked_nodes[i] & LOCKED_YES)
-                    != LOCKED_YES)
+                if ((inodelk->locked_nodes[i] & LOCKED_YES) != LOCKED_YES)
                         continue;
 
                 if (local->fd) {
@@ -757,7 +772,7 @@ afr_unlock_inodelk (call_frame_t *frame, xlator_t *this)
                                            (void *) (long)i,
                                            priv->children[i],
                                            priv->children[i]->fops->finodelk,
-                                           this->name, local->fd,
+                                           int_lock->domain, local->fd,
                                            F_SETLK, flock_use, NULL);
 
                         if (!--call_count)
@@ -772,7 +787,7 @@ afr_unlock_inodelk (call_frame_t *frame, xlator_t *this)
                                            (void *) (long)i,
                                            priv->children[i],
                                            priv->children[i]->fops->inodelk,
-                                           this->name, &local->loc,
+                                           int_lock->domain, &local->loc,
                                            F_SETLK, &flock, NULL);
 
                         if (!--call_count)
@@ -858,7 +873,7 @@ afr_unlock_entrylk (call_frame_t *frame, xlator_t *this)
                                            (void *) (long) i,
                                            priv->children[index],
                                            priv->children[index]->fops->entrylk,
-                                           this->name,
+                                           int_lock->domain,
                                            &int_lock->lockee[lockee_no].loc,
                                            int_lock->lockee[lockee_no].basename,
                                            ENTRYLK_UNLOCK, ENTRYLK_WRLCK, NULL);
@@ -961,6 +976,7 @@ static int
 afr_copy_locked_nodes (call_frame_t *frame, xlator_t *this)
 {
         afr_internal_lock_t *int_lock = NULL;
+        afr_inodelk_t       *inodelk  = NULL;
         afr_local_t         *local    = NULL;
         afr_private_t       *priv     = NULL;
 
@@ -971,10 +987,10 @@ afr_copy_locked_nodes (call_frame_t *frame, xlator_t *this)
         switch (local->transaction.type) {
         case AFR_DATA_TRANSACTION:
         case AFR_METADATA_TRANSACTION:
-                memcpy (int_lock->inode_locked_nodes,
-                        int_lock->locked_nodes,
-                        priv->child_count);
-                int_lock->inodelk_lock_count = int_lock->lock_count;
+                inodelk = afr_get_inodelk (int_lock, int_lock->domain);
+                memcpy (inodelk->locked_nodes, int_lock->locked_nodes,
+                        sizeof (*inodelk->locked_nodes) * priv->child_count);
+                inodelk->lock_count = int_lock->lock_count;
                 break;
 
         case AFR_ENTRY_RENAME_TRANSACTION:
@@ -1025,6 +1041,7 @@ int
 afr_lock_blocking (call_frame_t *frame, xlator_t *this, int cookie)
 {
         afr_internal_lock_t *int_lock    = NULL;
+        afr_inodelk_t       *inodelk     = NULL;
         afr_local_t         *local       = NULL;
         afr_private_t       *priv        = NULL;
         struct gf_flock flock = {0,};
@@ -1039,10 +1056,15 @@ afr_lock_blocking (call_frame_t *frame, xlator_t *this, int cookie)
         priv          = this->private;
         child_index   = cookie % priv->child_count;
         lockee_no     = cookie / priv->child_count;
+        is_entrylk    = afr_is_entrylk (int_lock, local->transaction.type);
+
 
-        flock.l_start = int_lock->lk_flock.l_start;
-        flock.l_len   = int_lock->lk_flock.l_len;
-        flock.l_type  = int_lock->lk_flock.l_type;
+        if (!is_entrylk) {
+                inodelk = afr_get_inodelk (int_lock, int_lock->domain);
+                flock.l_start = inodelk->flock.l_start;
+                flock.l_len   = inodelk->flock.l_len;
+                flock.l_type  = inodelk->flock.l_type;
+        }
 
         if (local->fd) {
                 ret = fd_ctx_get (local->fd, this, &ctx);
@@ -1064,8 +1086,6 @@ afr_lock_blocking (call_frame_t *frame, xlator_t *this, int cookie)
         }
 
         if (int_lock->lk_expected_count == int_lock->lk_attempted_count) {
-                is_entrylk = afr_is_entrylk (int_lock, local->transaction.type);
-
                 if ((is_entrylk && int_lock->entrylk_lock_count == 0) ||
                     (!is_entrylk && int_lock->lock_count == 0)) {
                         gf_log (this->name, GF_LOG_INFO,
@@ -1114,7 +1134,7 @@ afr_lock_blocking (call_frame_t *frame, xlator_t *this, int cookie)
                                            (void *) (long) child_index,
                                            priv->children[child_index],
                                            priv->children[child_index]->fops->finodelk,
-                                           this->name, local->fd,
+                                           int_lock->domain, local->fd,
                                            F_SETLKW, &flock, NULL);
 
                 } else {
@@ -1127,7 +1147,7 @@ afr_lock_blocking (call_frame_t *frame, xlator_t *this, int cookie)
                                            (void *) (long) child_index,
                                            priv->children[child_index],
                                            priv->children[child_index]->fops->inodelk,
-                                           this->name, &local->loc,
+                                           int_lock->domain, &local->loc,
                                            F_SETLKW, &flock, NULL);
                 }
 
@@ -1148,7 +1168,7 @@ afr_lock_blocking (call_frame_t *frame, xlator_t *this, int cookie)
                                            (void *) (long) cookie,
                                            priv->children[child_index],
                                            priv->children[child_index]->fops->fentrylk,
-                                           this->name, local->fd,
+                                           int_lock->domain, local->fd,
                                            int_lock->lockee[lockee_no].basename,
                                            ENTRYLK_LOCK, ENTRYLK_WRLCK, NULL);
                 } else {
@@ -1161,7 +1181,7 @@ afr_lock_blocking (call_frame_t *frame, xlator_t *this, int cookie)
                                            (void *) (long) cookie,
                                            priv->children[child_index],
                                            priv->children[child_index]->fops->entrylk,
-                                           this->name,
+                                           int_lock->domain,
                                            &int_lock->lockee[lockee_no].loc,
                                            int_lock->lockee[lockee_no].basename,
                                            ENTRYLK_LOCK, ENTRYLK_WRLCK, NULL);
@@ -1316,6 +1336,7 @@ afr_nonblocking_entrylk (call_frame_t *frame, xlator_t *this)
                         local->op_errno         = EINVAL;
                         int_lock->lock_op_errno = EINVAL;
 
+			afr_unlock (frame, this);
                         return -1;
                 }
 
@@ -1390,6 +1411,7 @@ afr_nonblocking_inodelk_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                              int32_t op_ret, int32_t op_errno, dict_t *xdata)
 {
         afr_internal_lock_t *int_lock = NULL;
+        afr_inodelk_t       *inodelk  = NULL;
         afr_local_t         *local    = NULL;
         int call_count  = 0;
         int child_index = (long) cookie;
@@ -1398,6 +1420,7 @@ afr_nonblocking_inodelk_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
 
         local    = frame->local;
         int_lock = &local->internal_lock;
+        inodelk = afr_get_inodelk (int_lock, int_lock->domain);
 
         AFR_TRACE_INODELK_OUT (frame, this, AFR_INODELK_NB_TRANSACTION,
                                AFR_LOCK_OP, NULL, op_ret,
@@ -1423,9 +1446,8 @@ afr_nonblocking_inodelk_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
 			if (local->transaction.eager_lock)
 				local->transaction.eager_lock[child_index] = 0;
 		} else {
-			int_lock->inode_locked_nodes[child_index]
-				|= LOCKED_YES;
-			int_lock->inodelk_lock_count++;
+			inodelk->locked_nodes[child_index] |= LOCKED_YES;
+			inodelk->lock_count++;
 
 			if (local->transaction.eager_lock &&
 			    local->transaction.eager_lock[child_index] &&
@@ -1448,8 +1470,7 @@ afr_nonblocking_inodelk_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                 gf_log (this->name, GF_LOG_TRACE,
                         "Last inode locking reply received");
                 /* all locks successful. Proceed to call FOP */
-                if (int_lock->inodelk_lock_count ==
-                                int_lock->lk_expected_count) {
+                if (inodelk->lock_count == int_lock->lk_expected_count) {
                         gf_log (this->name, GF_LOG_TRACE,
                                 "All servers locked. Calling the cbk");
                         int_lock->lock_op_ret = 0;
@@ -1473,6 +1494,7 @@ int
 afr_nonblocking_inodelk (call_frame_t *frame, xlator_t *this)
 {
         afr_internal_lock_t *int_lock = NULL;
+        afr_inodelk_t       *inodelk  = NULL;
         afr_local_t         *local    = NULL;
         afr_private_t       *priv     = NULL;
         afr_fd_ctx_t        *fd_ctx   = NULL;
@@ -1488,11 +1510,13 @@ afr_nonblocking_inodelk (call_frame_t *frame, xlator_t *this)
         int_lock = &local->internal_lock;
         priv     = this->private;
 
-        flock.l_start = int_lock->lk_flock.l_start;
-        flock.l_len   = int_lock->lk_flock.l_len;
-        flock.l_type  = int_lock->lk_flock.l_type;
+        inodelk = afr_get_inodelk (int_lock, int_lock->domain);
+
+        flock.l_start = inodelk->flock.l_start;
+        flock.l_len   = inodelk->flock.l_len;
+        flock.l_type  = inodelk->flock.l_type;
 
-        full_flock.l_type = int_lock->lk_flock.l_type;
+        full_flock.l_type = inodelk->flock.l_type;
 
         initialize_inodelk_variables (frame, this);
 
@@ -1508,6 +1532,7 @@ afr_nonblocking_inodelk (call_frame_t *frame, xlator_t *this)
                         local->op_errno         = EINVAL;
                         int_lock->lock_op_errno = EINVAL;
 
+			afr_unlock (frame, this);
                         ret = -1;
                         goto out;
                 }
@@ -1566,7 +1591,7 @@ afr_nonblocking_inodelk (call_frame_t *frame, xlator_t *this)
                                            (void *) (long) i,
                                            priv->children[i],
                                            priv->children[i]->fops->finodelk,
-                                           this->name, local->fd,
+                                           int_lock->domain, local->fd,
                                            F_SETLK, flock_use, NULL);
 
                         if (!--call_count)
@@ -1588,7 +1613,7 @@ afr_nonblocking_inodelk (call_frame_t *frame, xlator_t *this)
                                            (void *) (long) i,
                                            priv->children[i],
                                            priv->children[i]->fops->inodelk,
-                                           this->name, &local->loc,
+                                           int_lock->domain, &local->loc,
                                            F_SETLK, &flock, NULL);
 
                         if (!--call_count)
@@ -2112,29 +2137,38 @@ out:
         return ret;
 }
 
-void
-afr_lk_transfer_datalock (call_frame_t *dst, call_frame_t *src,
+int
+afr_lk_transfer_datalock (call_frame_t *dst, call_frame_t *src, char *dom,
                           unsigned int child_count)
 {
-        afr_local_t *dst_local = NULL;
-        afr_local_t *src_local = NULL;
-        afr_internal_lock_t *dst_lock = NULL;
-        afr_internal_lock_t *src_lock = NULL;
+        afr_local_t         *dst_local   = NULL;
+        afr_local_t         *src_local   = NULL;
+        afr_internal_lock_t *dst_lock    = NULL;
+        afr_internal_lock_t *src_lock    = NULL;
+        afr_inodelk_t       *dst_inodelk = NULL;
+        afr_inodelk_t       *src_inodelk = NULL;
+        int                 ret = -1;
 
-        dst_local = dst->local;
-        dst_lock  = &dst_local->internal_lock;
         src_local = src->local;
         src_lock  = &src_local->internal_lock;
-        if (src_lock->inode_locked_nodes) {
-                memcpy (dst_lock->inode_locked_nodes,
-                        src_lock->inode_locked_nodes,
-                        sizeof (*dst_lock->inode_locked_nodes) * child_count);
-                memset (src_lock->inode_locked_nodes, 0,
-                        sizeof (*src_lock->inode_locked_nodes) * child_count);
+        src_inodelk = afr_get_inodelk (src_lock, dom);
+        dst_local = dst->local;
+        dst_lock  = &dst_local->internal_lock;
+        dst_inodelk = afr_get_inodelk (dst_lock, dom);
+        if (!dst_inodelk || !src_inodelk)
+                goto out;
+        if (src_inodelk->locked_nodes) {
+                memcpy (dst_inodelk->locked_nodes, src_inodelk->locked_nodes,
+                        sizeof (*dst_inodelk->locked_nodes) * child_count);
+                memset (src_inodelk->locked_nodes, 0,
+                        sizeof (*src_inodelk->locked_nodes) * child_count);
         }
 
         dst_lock->transaction_lk_type = src_lock->transaction_lk_type;
         dst_lock->selfheal_lk_type    = src_lock->selfheal_lk_type;
-        dst_lock->inodelk_lock_count = src_lock->inodelk_lock_count;
-        src_lock->inodelk_lock_count = 0;
+        dst_inodelk->lock_count = src_inodelk->lock_count;
+        src_inodelk->lock_count = 0;
+        ret = 0;
+out:
+        return ret;
 }
diff --git a/xlators/cluster/afr/src/afr-mem-types.h b/xlators/cluster/afr/src/afr-mem-types.h
index e01ab366f..73594f265 100644
--- a/xlators/cluster/afr/src/afr-mem-types.h
+++ b/xlators/cluster/afr/src/afr-mem-types.h
@@ -41,7 +41,10 @@ enum gf_afr_mem_types_ {
         gf_afr_mt_shd_event_t,
         gf_afr_mt_time_t,
         gf_afr_mt_pos_data_t,
-	gf_afr_mt_reply_t,
+        gf_afr_mt_reply_t,
+        gf_afr_mt_stats_t,
+        gf_afr_mt_shd_crawl_event_t,
+        gf_afr_mt_uint64_t,
         gf_afr_mt_end
 };
 #endif
diff --git a/xlators/cluster/afr/src/afr-self-heal-algorithm.c b/xlators/cluster/afr/src/afr-self-heal-algorithm.c
index 1721fd270..83846f152 100644
--- a/xlators/cluster/afr/src/afr-self-heal-algorithm.c
+++ b/xlators/cluster/afr/src/afr-self-heal-algorithm.c
@@ -100,7 +100,7 @@ sh_loop_driver_done (call_frame_t *sh_frame, xlator_t *this,
         }
 
         sh_private_cleanup (sh_frame, this);
-        if (sh->op_failed) {
+        if (is_self_heal_failed (sh, AFR_CHECK_SPECIFIC)) {
                 GF_ASSERT (!last_loop_frame);
                 //loop_finish should have happened and the old_loop should be NULL
                 gf_log (this->name, GF_LOG_DEBUG,
@@ -143,7 +143,7 @@ sh_loop_finish (call_frame_t *loop_frame, xlator_t *this)
         }
 
         if (loop_sh && loop_sh->data_lock_held) {
-                afr_sh_data_unlock (loop_frame, this,
+                afr_sh_data_unlock (loop_frame, this, this->name,
                                     sh_destroy_frame);
         } else {
                 sh_destroy_frame (loop_frame, this);
@@ -214,7 +214,7 @@ sh_loop_frame_create (call_frame_t *sh_frame, xlator_t *this,
                 goto out;
         //We want the frame to have same lk_owner as sh_frame
         //so that locks translator allows conflicting locks
-        new_loop_local = afr_local_copy (local, this);
+        new_loop_local = afr_self_heal_local_init (local, this);
         if (!new_loop_local)
                 goto out;
         new_loop_frame->local = new_loop_local;
@@ -273,10 +273,10 @@ sh_loop_start (call_frame_t *sh_frame, xlator_t *this, off_t offset,
         new_loop_sh->offset = offset;
         new_loop_sh->block_size = sh->block_size;
         afr_sh_data_lock (new_loop_frame, this, offset, new_loop_sh->block_size,
-			  _gf_true, sh_loop_lock_success, sh_loop_lock_failure);
+                          _gf_true, this->name, sh_loop_lock_success, sh_loop_lock_failure);
         return 0;
 out:
-        sh->op_failed = 1;
+        afr_set_self_heal_status (sh, AFR_SELF_HEAL_FAILED);
         if (old_loop_frame)
                 sh_loop_finish (old_loop_frame, this);
         sh_loop_return (sh_frame, this, new_loop_frame, -1, ENOMEM);
@@ -307,8 +307,9 @@ sh_loop_driver (call_frame_t *sh_frame, xlator_t *this,
                         sh_priv->loops_running--;
                 offset = sh_priv->offset;
                 block_size = sh->block_size;
-                while ((!sh->eof_reached) && (0 == sh->op_failed) &&
-                       (sh_priv->loops_running < priv->data_self_heal_window_size)
+                while ((!sh->eof_reached) &&
+                       (!is_self_heal_failed (sh, AFR_CHECK_SPECIFIC)) &&
+                     (sh_priv->loops_running < priv->data_self_heal_window_size)
                        && (sh_priv->offset < sh->file_size)) {
 
                         loop++;
@@ -327,7 +328,8 @@ sh_loop_driver (call_frame_t *sh_frame, xlator_t *this,
         if (0 == loop) {
                 //loop finish does unlock, but the erasing of the pending
                 //xattrs needs to happen before that so do not finish the loop
-                if (is_driver_done && !sh->op_failed)
+                if (is_driver_done &&
+                    !is_self_heal_failed (sh, AFR_CHECK_SPECIFIC))
                         goto driver_done;
                 if (old_loop_frame) {
                         sh_loop_finish (old_loop_frame, this);
@@ -338,7 +340,7 @@ sh_loop_driver (call_frame_t *sh_frame, xlator_t *this,
         //If we have more loops to form we should finish previous loop after
         //the next loop lock
         while (loop--) {
-                if (sh->op_failed) {
+                if (is_self_heal_failed (sh, AFR_CHECK_SPECIFIC)) {
                         // op failed in other loop, stop spawning more loops
                         if (old_loop_frame) {
                                 sh_loop_finish (old_loop_frame, this);
@@ -384,7 +386,7 @@ sh_loop_return (call_frame_t *sh_frame, xlator_t *this, call_frame_t *loop_frame
         }
 
         if (op_ret == -1) {
-                sh->op_failed = 1;
+                afr_set_self_heal_status (sh, AFR_SELF_HEAL_FAILED);
                 afr_sh_set_error (sh, op_errno);
                 if (loop_frame) {
                         sh_loop_finish (loop_frame, this);
@@ -432,16 +434,16 @@ sh_loop_write_cbk (call_frame_t *loop_frame, void *cookie, xlator_t *this,
                         priv->children[child_index]->name,
                         strerror (op_errno));
 
-                sh->op_failed = 1;
+                afr_set_self_heal_status (sh, AFR_SELF_HEAL_FAILED);
                 afr_sh_set_error (loop_sh, op_errno);
         } else if (op_ret < loop_local->cont.writev.vector->iov_len) {
-		gf_log(this->name, GF_LOG_ERROR,
-		       "incomplete write to %s on subvolume %s "
-		       "(expected %lu, returned %d)", sh_local->loc.path,
-		       priv->children[child_index]->name,
-		       loop_local->cont.writev.vector->iov_len, op_ret);
-		sh->op_failed = 1;
-	}
+                gf_log (this->name, GF_LOG_ERROR,
+                        "incomplete write to %s on subvolume %s "
+                        "(expected %lu, returned %d)", sh_local->loc.path,
+                        priv->children[child_index]->name,
+                        loop_local->cont.writev.vector->iov_len, op_ret);
+                afr_set_self_heal_status (sh, AFR_SELF_HEAL_FAILED);
+        }
 
         call_count = afr_frame_return (loop_frame);
 
@@ -514,7 +516,7 @@ sh_loop_read_cbk (call_frame_t *loop_frame, void *cookie,
 
         if (op_ret <= 0) {
                 if (op_ret < 0) {
-                        sh->op_failed = 1;
+                        afr_set_self_heal_status (sh, AFR_SELF_HEAL_FAILED);
                         gf_log (this->name, GF_LOG_ERROR, "read failed on %d "
                                 "for %s reason :%s", sh->source,
                                 sh_local->loc.path, strerror (errno));
@@ -624,7 +626,7 @@ sh_diff_checksum_cbk (call_frame_t *loop_frame, void *cookie, xlator_t *this,
                         "checksum on %s failed on subvolume %s (%s)",
                         sh_local->loc.path, priv->children[child_index]->name,
                         strerror (op_errno));
-                sh->op_failed = 1;
+                afr_set_self_heal_status (sh, AFR_SELF_HEAL_FAILED);
         } else {
                 memcpy (loop_sh->checksum + child_index * MD5_DIGEST_LENGTH,
                         strong_checksum, MD5_DIGEST_LENGTH);
@@ -662,7 +664,8 @@ sh_diff_checksum_cbk (call_frame_t *loop_frame, void *cookie, xlator_t *this,
                 }
                 UNLOCK (&sh_priv->lock);
 
-                if (write_needed && !sh->op_failed) {
+                if (write_needed &&
+                    !is_self_heal_failed (sh, AFR_CHECK_SPECIFIC)) {
                         sh_loop_read (loop_frame, this);
                 } else {
                         sh_loop_return (sh_frame, this, loop_frame,
@@ -751,14 +754,15 @@ out:
         return sh_priv;
 }
 
-void
-afr_sh_transfer_lock (call_frame_t *dst, call_frame_t *src,
+int
+afr_sh_transfer_lock (call_frame_t *dst, call_frame_t *src, char *dom,
                       unsigned int child_count)
 {
         afr_local_t             *dst_local   = NULL;
         afr_self_heal_t         *dst_sh      = NULL;
         afr_local_t             *src_local   = NULL;
         afr_self_heal_t         *src_sh      = NULL;
+        int                     ret          = -1;
 
         dst_local = dst->local;
         dst_sh = &dst_local->self_heal;
@@ -766,9 +770,12 @@ afr_sh_transfer_lock (call_frame_t *dst, call_frame_t *src,
         src_sh = &src_local->self_heal;
         GF_ASSERT (src_sh->data_lock_held);
         GF_ASSERT (!dst_sh->data_lock_held);
-        afr_lk_transfer_datalock (dst, src, child_count);
+        ret = afr_lk_transfer_datalock (dst, src, dom, child_count);
+        if (ret)
+                return ret;
         src_sh->data_lock_held = _gf_false;
         dst_sh->data_lock_held = _gf_true;
+        return 0;
 }
 
 int
@@ -790,7 +797,10 @@ afr_sh_start_loops (call_frame_t *sh_frame, xlator_t *this,
         ret = sh_loop_frame_create (sh_frame, this, NULL, &first_loop_frame);
         if (ret)
                 goto out;
-        afr_sh_transfer_lock (first_loop_frame, sh_frame, priv->child_count);
+        ret = afr_sh_transfer_lock (first_loop_frame, sh_frame, this->name,
+                                    priv->child_count);
+        if (ret)
+                goto out;
         sh->private = afr_sh_priv_init ();
         if (!sh->private) {
                 ret = -1;
@@ -800,7 +810,7 @@ afr_sh_start_loops (call_frame_t *sh_frame, xlator_t *this,
         ret = 0;
 out:
         if (ret) {
-                sh->op_failed = 1;
+                afr_set_self_heal_status (sh, AFR_SELF_HEAL_FAILED);
                 sh_loop_driver_done (sh_frame, this, NULL);
         }
         return 0;
diff --git a/xlators/cluster/afr/src/afr-self-heal-common.c b/xlators/cluster/afr/src/afr-self-heal-common.c
index 510dcdaf4..ef92b4205 100644
--- a/xlators/cluster/afr/src/afr-self-heal-common.c
+++ b/xlators/cluster/afr/src/afr-self-heal-common.c
@@ -18,6 +18,28 @@
 #include "afr-self-heal.h"
 #include "pump.h"
 
+#define ADD_FMT_STRING(msg, off, sh_str, status, print_log)                 \
+        do {                                                                \
+                if (AFR_SELF_HEAL_NOT_ATTEMPTED != status) {                \
+                        off += snprintf (msg + off, sizeof (msg) - off,     \
+                                         " "sh_str" self heal %s,",         \
+                                         get_sh_completion_status (status));\
+                        print_log = 1;                                      \
+                }                                                           \
+        } while (0)
+
+#define ADD_FMT_STRING_SYNC(msg, off, sh_str, status, print_log)            \
+        do {                                                                \
+                if (AFR_SELF_HEAL_SYNC_BEGIN == status ||                   \
+                    AFR_SELF_HEAL_FAILED == status)  {                      \
+                        off += snprintf (msg + off, sizeof (msg) - off,     \
+                                         " "sh_str" self heal %s,",         \
+                                         get_sh_completion_status (status));\
+                        print_log = 1;                                      \
+                }                                                           \
+        } while (0)
+
+
 void
 afr_sh_reset (call_frame_t *frame, xlator_t *this)
 {
@@ -141,9 +163,8 @@ afr_sh_print_pending_matrix (int32_t *pending_matrix[], xlator_t *this)
         GF_FREE (buf);
 }
 
-void
-afr_sh_print_split_brain_log (int32_t *pending_matrix[], xlator_t *this,
-                              const char *loc)
+char*
+afr_get_pending_matrix_str (int32_t *pending_matrix[], xlator_t *this)
 {
         afr_private_t *  priv = this->private;
         char            *buf  = NULL;
@@ -173,10 +194,8 @@ afr_sh_print_split_brain_log (int32_t *pending_matrix[], xlator_t *this,
                         + (child_count * child_count * pending_entry_strlen);
 
         buf = GF_CALLOC (1, 1 + strlen (msg) + string_length , gf_afr_mt_char);
-        if (!buf) {
-                buf = "";
+        if (!buf)
                 goto out;
-        }
 
         ptr = buf;
         ptr += sprintf (ptr, "%s", msg);
@@ -192,11 +211,27 @@ afr_sh_print_split_brain_log (int32_t *pending_matrix[], xlator_t *this,
         ptr += sprintf (ptr, "%s", matrix_end);
 
 out:
+        return buf;
+}
+
+void
+afr_sh_print_split_brain_log (int32_t *pending_matrix[], xlator_t *this,
+                              const char *loc)
+{
+        char *buf      = NULL;
+        char *free_ptr = NULL;
+
+        buf = afr_get_pending_matrix_str (pending_matrix, this);
+        if (buf)
+                free_ptr = buf;
+        else
+                buf = "";
+
+
         gf_log (this->name, GF_LOG_ERROR, "Unable to self-heal contents of '%s'"
                 " (possible split-brain). Please delete the file from all but "
                 "the preferred subvolume.%s", loc, buf);
-        if (buf)
-                GF_FREE (buf);
+        GF_FREE (free_ptr);
         return;
 }
 
@@ -466,6 +501,8 @@ afr_find_biggest_witness_among_fools (int32_t *witnesses,
 {
         int i               = 0;
         int biggest_witness = -1;
+        int biggest_witness_idx = -1;
+        int biggest_witness_cnt = -1;
 
         GF_ASSERT (witnesses);
         GF_ASSERT (characters);
@@ -475,10 +512,21 @@ afr_find_biggest_witness_among_fools (int32_t *witnesses,
                 if (characters[i].type != AFR_NODE_FOOL)
                         continue;
 
-                if (biggest_witness < witnesses[i])
+                if (biggest_witness < witnesses[i]) {
                         biggest_witness = witnesses[i];
+			biggest_witness_idx = i;
+			biggest_witness_cnt = 1;
+			continue;
+		}
+
+		if (biggest_witness == witnesses[i])
+			biggest_witness_cnt++;
         }
-        return biggest_witness;
+
+	if (biggest_witness_cnt != 1)
+		return -1;
+
+        return biggest_witness_idx;
 }
 
 int
@@ -506,10 +554,84 @@ afr_mark_fool_as_source_by_witness (int32_t *sources, int32_t *witnesses,
         return nsources;
 }
 
+
+int
+afr_mark_fool_as_source_by_idx (int32_t *sources, int child_count, int idx)
+{
+	if (idx >= 0 && idx < child_count) {
+		sources[idx] = 1;
+		return 1;
+	}
+	return 0;
+}
+
+
+static int
+afr_find_largest_file_size (struct iatt *bufs, int32_t *success_children,
+			    int child_count)
+{
+	int idx = -1;
+	int i = -1;
+	int child = -1;
+	uint64_t max_size = 0;
+        uint64_t min_size = 0;
+        int      num_children = 0;
+
+	for (i = 0; i < child_count; i++) {
+		if (success_children[i] == -1)
+			break;
+
+		child = success_children[i];
+		if (bufs[child].ia_size > max_size) {
+			max_size = bufs[child].ia_size;
+			idx = child;
+		}
+
+                if ((num_children == 0) || (bufs[child].ia_size < min_size)) {
+                        min_size = bufs[child].ia_size;
+                }
+
+                num_children++;
+	}
+
+        /* If sizes are same for all of them, finding sources will have to
+         * happen with pending changelog. So return -1
+         */
+        if ((num_children > 1) && (min_size == max_size))
+                return -1;
+	return idx;
+}
+
+
+static int
+afr_find_newest_file (struct iatt *bufs, int32_t *success_children,
+		      int child_count)
+{
+	int idx = -1;
+	int i = -1;
+	int child = -1;
+	uint64_t max_ctime = 0;
+
+	for (i = 0; i < child_count; i++) {
+		if (success_children[i] == -1)
+			break;
+
+		child = success_children[i];
+		if (bufs[child].ia_ctime > max_ctime) {
+			max_ctime = bufs[child].ia_ctime;
+			idx = child;
+		}
+	}
+
+	return idx;
+}
+
+
 static int
 afr_mark_biggest_of_fools_as_source (int32_t *sources, int32_t **pending_matrix,
                                      afr_node_character *characters,
-                                     int child_count)
+				     int32_t *success_children,
+                                     int child_count, struct iatt *bufs)
 {
         int32_t       biggest_witness = 0;
         int           nsources        = 0;
@@ -517,6 +639,11 @@ afr_mark_biggest_of_fools_as_source (int32_t *sources, int32_t **pending_matrix,
 
         GF_ASSERT (child_count > 0);
 
+	biggest_witness = afr_find_largest_file_size (bufs, success_children,
+						      child_count);
+	if (biggest_witness != -1)
+		goto found;
+
         witnesses = GF_CALLOC (child_count, sizeof (*witnesses),
                                gf_afr_mt_int32_t);
         if (NULL == witnesses) {
@@ -529,9 +656,15 @@ afr_mark_biggest_of_fools_as_source (int32_t *sources, int32_t **pending_matrix,
         biggest_witness = afr_find_biggest_witness_among_fools (witnesses,
                                                                 characters,
                                                                 child_count);
-        nsources = afr_mark_fool_as_source_by_witness (sources, witnesses,
-                                                       characters, child_count,
-                                                       biggest_witness);
+	if (biggest_witness != -1)
+		goto found;
+
+	biggest_witness = afr_find_newest_file (bufs, success_children,
+						child_count);
+
+found:
+	nsources = afr_mark_fool_as_source_by_idx (sources, child_count,
+						   biggest_witness);
 out:
         GF_FREE (witnesses);
         return nsources;
@@ -875,7 +1008,8 @@ afr_mark_sources (xlator_t *this, int32_t *sources, int32_t **pending_matrix,
                 nsources = afr_mark_biggest_of_fools_as_source (sources,
                                                                 pending_matrix,
                                                                 characters,
-                                                                child_count);
+								success_children,
+                                                                child_count, bufs);
         }
 
 out:
@@ -1012,14 +1146,13 @@ afr_sh_missing_entries_done (call_frame_t *frame, xlator_t *this)
 
         afr_sh_reset (frame, this);
 
-        if (local->govinda_gOvinda) {
+        if (local->unhealable) {
                 gf_log (this->name, GF_LOG_DEBUG,
                         "split brain found, aborting selfheal of %s",
                         local->loc.path);
-                sh->op_failed = 1;
         }
 
-        if (sh->op_failed) {
+        if (is_self_heal_failed (sh, AFR_CHECK_SPECIFIC)) {
                 sh->completion_cbk (frame, this);
         } else {
                 gf_log (this->name, GF_LOG_TRACE,
@@ -1251,7 +1384,7 @@ out:
         if (ret) {
                 gf_log (this->name, GF_LOG_ERROR, "impunge of %s failed, "
                         "reason: %s", local->loc.path, strerror (-ret));
-                sh->op_failed = 1;
+                afr_set_self_heal_status (sh, AFR_SELF_HEAL_FAILED);
         }
         afr_sh_missing_entries_finish (frame, this);
 }
@@ -1266,7 +1399,7 @@ afr_sh_create_entry_cbk (call_frame_t *frame, xlator_t *this,
         local = frame->local;
         sh = &local->self_heal;
         if (op_ret < 0)
-                sh->op_failed = 1;
+                afr_set_self_heal_status (sh, AFR_SELF_HEAL_FAILED);
         afr_sh_missing_entries_finish (frame, this);
         return 0;
 }
@@ -1290,7 +1423,7 @@ sh_missing_entries_create (call_frame_t *frame, xlator_t *this)
         if (!afr_valid_ia_type (type)) {
                 gf_log (this->name, GF_LOG_ERROR,
                         "%s: unknown file type: 0%o", local->loc.path, type);
-                local->govinda_gOvinda = 1;
+                afr_set_local_for_unhealable (local);
                 afr_sh_missing_entries_finish (frame, this);
                 goto out;
         }
@@ -1323,8 +1456,9 @@ afr_sh_missing_entries_lookup_done (call_frame_t *frame, xlator_t *this,
         loc = &local->loc;
 
         if (op_ret < 0) {
-                if (op_errno == EIO)
-                        local->govinda_gOvinda = 1;
+                if (op_errno == EIO) {
+                        afr_set_local_for_unhealable (local);
+                }
                 // EIO can happen if finding the fresh parent dir failed
                 goto out;
         }
@@ -1386,7 +1520,7 @@ afr_sh_missing_entries_lookup_done (call_frame_t *frame, xlator_t *this,
         }
         return;
 out:
-        sh->op_failed = 1;
+        afr_set_self_heal_status (sh, AFR_SELF_HEAL_FAILED);
         afr_sh_set_error (sh, op_errno);
         afr_sh_missing_entries_finish (frame, this);
         return;
@@ -1470,7 +1604,7 @@ afr_sh_remove_entry_cbk (call_frame_t *frame, xlator_t *this, int child,
                 LOCK (&frame->lock);
                 {
                         afr_sh_set_error (sh, EIO);
-                        sh->op_failed = 1;
+                        afr_set_self_heal_status (sh, AFR_SELF_HEAL_FAILED);
                 }
                 UNLOCK (&frame->lock);
         }
@@ -1552,7 +1686,7 @@ afr_sh_purge_stale_entries_done (call_frame_t *frame, xlator_t *this)
         sh       = &local->self_heal;
         priv     = this->private;
 
-        if (sh->op_failed) {
+        if (is_self_heal_failed (sh, AFR_CHECK_SPECIFIC)) {
                 afr_sh_missing_entries_finish (frame, this);
         } else {
                 if (afr_gfid_missing_count (this->name, sh->fresh_children,
@@ -1645,7 +1779,7 @@ afr_sh_purge_entry_common (call_frame_t *frame, xlator_t *this,
                 if (!purge_condition (local, priv, i))
                         continue;
                 gf_log (this->name, GF_LOG_INFO, "purging the stale entry %s "
-                        "on %d", local->loc.path, i);
+                        "on %s", local->loc.path, priv->children[i]->name);
                 afr_sh_call_entry_expunge_remove (frame, this,
                                                   (long) i, &sh->buf[i],
                                                   &sh->parentbufs[i],
@@ -1765,10 +1899,8 @@ afr_sh_children_lookup_done (call_frame_t *frame, xlator_t *this,
                                                sh->child_errno,
                                                priv->child_count, ENOENT);
         if (fresh_child_enoents == fresh_parent_count) {
-                gf_log (this->name, GF_LOG_INFO, "Deleting stale file %s",
-                        local->loc.path);
                 afr_sh_set_error (sh, ENOENT);
-                sh->op_failed = 1;
+                afr_set_self_heal_status (sh, AFR_SELF_HEAL_FAILED);
                 afr_sh_purge_entry (frame, this);
         } else if (!afr_conflicting_iattrs (sh->buf, sh->fresh_children,
                                             priv->child_count, local->loc.path,
@@ -1782,14 +1914,14 @@ afr_sh_children_lookup_done (call_frame_t *frame, xlator_t *this,
                 afr_sh_purge_stale_entry (frame, this);
         } else {
                 op_errno = EIO;
-                local->govinda_gOvinda = 1;
+                afr_set_local_for_unhealable (local);
                 goto fail;
         }
 
         return;
 
 fail:
-        sh->op_failed = 1;
+        afr_set_self_heal_status (sh, AFR_SELF_HEAL_FAILED);
         afr_sh_set_error (sh, op_errno);
         afr_sh_missing_entries_finish (frame, this);
         return;
@@ -1860,8 +1992,8 @@ afr_sh_find_fresh_parents (call_frame_t *frame, xlator_t *this,
 
 out:
         afr_sh_set_error (sh, op_errno);
-        sh->op_failed = 1;
-        afr_sh_missing_entries_finish (frame, this);
+        afr_set_self_heal_status (sh, AFR_SELF_HEAL_FAILED);
+	afr_sh_missing_entries_finish (frame, this);
         return;
 }
 
@@ -1950,7 +2082,8 @@ afr_sh_common_lookup (call_frame_t *frame, xlator_t *this, loc_t *loc,
 
 
 int
-afr_sh_post_nb_entrylk_conflicting_sh_cbk (call_frame_t *frame, xlator_t *this)
+afr_sh_post_nb_entrylk_missing_entry_sh_cbk (call_frame_t *frame,
+                                             xlator_t *this)
 {
         afr_internal_lock_t *int_lock = NULL;
         afr_local_t         *local    = NULL;
@@ -1963,7 +2096,7 @@ afr_sh_post_nb_entrylk_conflicting_sh_cbk (call_frame_t *frame, xlator_t *this)
         if (int_lock->lock_op_ret < 0) {
                 gf_log (this->name, GF_LOG_INFO,
                         "Non blocking entrylks failed.");
-                sh->op_failed = -1;
+                afr_set_self_heal_status (sh, AFR_SELF_HEAL_FAILED);
                 afr_sh_missing_entries_done (frame, this);
         } else {
 
@@ -1979,34 +2112,6 @@ afr_sh_post_nb_entrylk_conflicting_sh_cbk (call_frame_t *frame, xlator_t *this)
 }
 
 int
-afr_sh_post_nb_entrylk_gfid_sh_cbk (call_frame_t *frame, xlator_t *this)
-{
-        afr_internal_lock_t *int_lock = NULL;
-        afr_local_t         *local    = NULL;
-        afr_self_heal_t     *sh       = NULL;
-
-        local    = frame->local;
-        sh       = &local->self_heal;
-        int_lock = &local->internal_lock;
-
-        if (int_lock->lock_op_ret < 0) {
-                gf_log (this->name, GF_LOG_INFO,
-                        "Non blocking entrylks failed.");
-                afr_sh_missing_entries_done (frame, this);
-        } else {
-                gf_log (this->name, GF_LOG_DEBUG,
-                        "Non blocking entrylks done. Proceeding to FOP");
-                afr_sh_common_lookup (frame, this, &local->loc,
-                                      afr_sh_missing_entries_lookup_done,
-                                      sh->sh_gfid_req, AFR_LOOKUP_FAIL_CONFLICTS|
-                                      AFR_LOOKUP_FAIL_MISSING_GFIDS,
-                                      NULL);
-        }
-
-        return 0;
-}
-
-int
 afr_sh_entrylk (call_frame_t *frame, xlator_t *this, loc_t *loc,
                 char *base_name, afr_lock_cbk_t lock_cbk)
 {
@@ -2026,6 +2131,7 @@ afr_sh_entrylk (call_frame_t *frame, xlator_t *this, loc_t *loc,
         int_lock->lk_basename = base_name;
         int_lock->lk_loc      = loc;
         int_lock->lock_cbk    = lock_cbk;
+        int_lock->domain      = this->name;
 
         int_lock->lockee_count = 0;
         afr_init_entry_lockee (&int_lock->lockee[0], local, loc,
@@ -2068,28 +2174,31 @@ out:
 }
 
 static int
-afr_self_heal_conflicting_entries (call_frame_t *frame, xlator_t *this)
+afr_self_heal_missing_entries (call_frame_t *frame, xlator_t *this)
 {
-        afr_self_heal_parent_entrylk (frame, this,
-                                      afr_sh_post_nb_entrylk_conflicting_sh_cbk);
-        return 0;
-}
+        afr_local_t     *local = NULL;
+        afr_self_heal_t *sh = NULL;
+
+        local = frame->local;
+        sh = &local->self_heal;
+
+        sh->sh_type_in_action  = AFR_SELF_HEAL_GFID_OR_MISSING_ENTRY;
+
+        afr_set_self_heal_status (sh, AFR_SELF_HEAL_STARTED);
 
-static int
-afr_self_heal_gfids (call_frame_t *frame, xlator_t *this)
-{
         afr_self_heal_parent_entrylk (frame, this,
-                                      afr_sh_post_nb_entrylk_gfid_sh_cbk);
+                                      afr_sh_post_nb_entrylk_missing_entry_sh_cbk);
         return 0;
 }
 
-afr_local_t *afr_local_copy (afr_local_t *l, xlator_t *this)
+afr_local_t*
+afr_self_heal_local_init (afr_local_t *l, xlator_t *this)
 {
-        afr_private_t *priv = NULL;
-        afr_local_t   *lc     = NULL;
-        afr_self_heal_t *sh = NULL;
-        afr_self_heal_t *shc = NULL;
-        int              i   = 0;
+        afr_private_t   *priv  = NULL;
+        afr_local_t     *lc    = NULL;
+        afr_self_heal_t *sh    = NULL;
+        afr_self_heal_t *shc   = NULL;
+        int             ret    = 0;
 
         priv = this->private;
 
@@ -2112,13 +2221,23 @@ afr_local_t *afr_local_copy (afr_local_t *l, xlator_t *this)
         shc->forced_merge = sh->forced_merge;
         shc->background = sh->background;
         shc->type = sh->type;
+        shc->data_sh_info = "";
+        shc->metadata_sh_info =  "";
 
         uuid_copy (shc->sh_gfid_req, sh->sh_gfid_req);
-        if (l->loc.path)
-                loc_copy (&lc->loc, &l->loc);
+        if (l->loc.path) {
+                ret = loc_copy (&lc->loc, &l->loc);
+                if (ret < 0)
+                        goto out;
+        }
 
         lc->child_up  = memdup (l->child_up,
                                 sizeof (*lc->child_up) * priv->child_count);
+        if (!lc->child_up) {
+                ret = -1;
+                goto out;
+        }
+
         if (l->xattr_req)
                 lc->xattr_req = dict_ref (l->xattr_req);
 
@@ -2126,59 +2245,25 @@ afr_local_t *afr_local_copy (afr_local_t *l, xlator_t *this)
                 lc->cont.lookup.inode = inode_ref (l->cont.lookup.inode);
         if (l->cont.lookup.xattr)
                 lc->cont.lookup.xattr = dict_ref (l->cont.lookup.xattr);
-        if (l->internal_lock.inode_locked_nodes)
-                lc->internal_lock.inode_locked_nodes =
-                        memdup (l->internal_lock.inode_locked_nodes,
-                                sizeof (*lc->internal_lock.inode_locked_nodes) * priv->child_count);
-        else
-                lc->internal_lock.inode_locked_nodes =
-                        GF_CALLOC (sizeof (*l->internal_lock.inode_locked_nodes),
-                                   priv->child_count,
-                                   gf_afr_mt_char);
-
-        if (l->internal_lock.locked_nodes)
-                lc->internal_lock.locked_nodes =
-                        memdup (l->internal_lock.locked_nodes,
-                                sizeof (*lc->internal_lock.locked_nodes) * priv->child_count);
-        else
-                lc->internal_lock.locked_nodes =
-                        GF_CALLOC (sizeof (*l->internal_lock.locked_nodes),
-                                   priv->child_count,
-                                   gf_afr_mt_char);
-
-        for (i = 0; i < l->internal_lock.lockee_count; i++) {
-                loc_copy (&lc->internal_lock.lockee[i].loc,
-                          &l->internal_lock.lockee[i].loc);
-
-                lc->internal_lock.lockee[i].locked_count =
-                        l->internal_lock.lockee[i].locked_count;
-
-                if (l->internal_lock.lockee[i].basename)
-                        lc->internal_lock.lockee[i].basename =
-                                gf_strdup (l->internal_lock.lockee[i].basename);
-
-                if (l->internal_lock.lockee[i].locked_nodes) {
-                        lc->internal_lock.lockee[i].locked_nodes =
-                                memdup (l->internal_lock.lockee[i].locked_nodes,
-                                        sizeof (*lc->internal_lock.lockee[i].locked_nodes) *
-                                        priv->child_count);
-                } else {
-                        lc->internal_lock.lockee[i].locked_nodes =
-                                GF_CALLOC (priv->child_count,
-                                           sizeof (*lc->internal_lock.lockee[i].locked_nodes),
-                                           gf_afr_mt_char);
-                }
 
+        lc->internal_lock.locked_nodes =
+                             GF_CALLOC (sizeof (*l->internal_lock.locked_nodes),
+                                        priv->child_count, gf_afr_mt_char);
+        if (!lc->internal_lock.locked_nodes) {
+                ret = -1;
+                goto out;
         }
-        lc->internal_lock.lockee_count = l->internal_lock.lockee_count;
-
-        lc->internal_lock.inodelk_lock_count =
-                l->internal_lock.inodelk_lock_count;
-        lc->internal_lock.entrylk_lock_count =
-                l->internal_lock.entrylk_lock_count;
 
+        ret = afr_inodelk_init (&lc->internal_lock.inodelk[0],
+                                this->name, priv->child_count);
+        if (ret)
+                goto out;
 
 out:
+        if (ret) {
+                afr_local_cleanup (lc, this);
+                lc = NULL;
+        }
         return lc;
 }
 
@@ -2191,32 +2276,28 @@ afr_self_heal_completion_cbk (call_frame_t *bgsh_frame, xlator_t *this)
         afr_local_t *     orig_frame_local = NULL;
         afr_self_heal_t * orig_frame_sh = NULL;
         char              sh_type_str[256] = {0,};
+        gf_loglevel_t     loglevel = 0;
 
         priv  = this->private;
         local = bgsh_frame->local;
         sh    = &local->self_heal;
 
-        if (local->govinda_gOvinda) {
+        if (local->unhealable) {
                 afr_set_split_brain (this, sh->inode, SPB, SPB);
-                sh->op_failed = 1;
         }
 
         afr_self_heal_type_str_get (sh, sh_type_str,
                                     sizeof(sh_type_str));
-        if (sh->op_failed) {
-                gf_loglevel_t     loglevel = GF_LOG_ERROR;
-                if (priv->shd.iamshd)
-                        loglevel = GF_LOG_DEBUG;
-
-                gf_log (this->name, loglevel, "background %s self-heal "
-                        "failed on %s", sh_type_str, local->loc.path);
-
+        if (is_self_heal_failed (sh, AFR_CHECK_ALL) && !priv->shd.iamshd) {
+                loglevel = GF_LOG_ERROR;
+        } else if (!is_self_heal_failed (sh, AFR_CHECK_ALL)) {
+                loglevel = GF_LOG_INFO;
         } else {
-                gf_log (this->name, GF_LOG_DEBUG, "background %s self-heal "
-                        "completed on %s", sh_type_str, local->loc.path);
-
+                loglevel = GF_LOG_DEBUG;
         }
 
+        afr_log_self_heal_completion_status (local, loglevel);
+
         FRAME_SU_UNDO (bgsh_frame, afr_local_t);
 
         if (!sh->unwound && sh->unwind) {
@@ -2224,7 +2305,7 @@ afr_self_heal_completion_cbk (call_frame_t *bgsh_frame, xlator_t *this)
                 orig_frame_sh = &orig_frame_local->self_heal;
                 orig_frame_sh->actual_sh_started = _gf_true;
                 sh->unwind (sh->orig_frame, this, sh->op_ret, sh->op_errno,
-                            sh->op_failed);
+                            is_self_heal_failed (sh, AFR_CHECK_ALL));
         }
 
         if (sh->background) {
@@ -2273,7 +2354,7 @@ afr_self_heal (call_frame_t *frame, xlator_t *this, inode_t *inode)
         afr_set_lk_owner (sh_frame, this, sh_frame->root);
         afr_set_low_priority (sh_frame);
 
-        sh_local        = afr_local_copy (local, this);
+        sh_local        = afr_self_heal_local_init (local, this);
         if (!sh_local)
                 goto out;
         sh_frame->local = sh_local;
@@ -2338,12 +2419,11 @@ afr_self_heal (call_frame_t *frame, xlator_t *this, inode_t *inode)
                 sh->do_gfid_self_heal = _gf_false;
         }
 
+        sh->sh_type_in_action = AFR_SELF_HEAL_INVALID;
+
         FRAME_SU_DO (sh_frame, afr_local_t);
-        if (sh->do_missing_entry_self_heal) {
-                afr_self_heal_conflicting_entries (sh_frame, this);
-        } else if (sh->do_gfid_self_heal) {
-                GF_ASSERT (!uuid_is_null (sh->sh_gfid_req));
-                afr_self_heal_gfids (sh_frame, this);
+        if (sh->do_missing_entry_self_heal || sh->do_gfid_self_heal) {
+                afr_self_heal_missing_entries (sh_frame, this);
         } else {
                 loc = &sh_local->loc;
                 if (uuid_is_null (loc->inode->gfid) && uuid_is_null (loc->gfid)) {
@@ -2550,9 +2630,183 @@ out:
         GF_FREE (erase_xattr);
 
         if (ret < 0) {
-                sh->op_failed = _gf_true;
+                afr_set_self_heal_status (sh, AFR_SELF_HEAL_FAILED);
                 finish (frame, this);
         }
 
         return 0;
 }
+
+void
+afr_set_self_heal_status(afr_self_heal_t *sh, afr_self_heal_status status)
+{
+        xlator_t                *this = NULL;
+        afr_sh_status_for_all_type *sh_status = &(sh->afr_all_sh_status);
+        afr_self_heal_type  sh_type_in_action = sh->sh_type_in_action;
+        this = THIS;
+
+        if (!sh) {
+                gf_log_callingfn (this->name, GF_LOG_ERROR, "Null self heal"
+                                  "Structure");
+                goto out;
+        }
+
+        switch (sh_type_in_action) {
+                case AFR_SELF_HEAL_GFID_OR_MISSING_ENTRY:
+                       sh_status->gfid_or_missing_entry_self_heal = status;
+                        break;
+                case AFR_SELF_HEAL_METADATA:
+                        sh_status->metadata_self_heal = status;
+                        break;
+                case AFR_SELF_HEAL_DATA:
+                        sh_status->data_self_heal = status;
+                        break;
+                case AFR_SELF_HEAL_ENTRY:
+                        sh_status->entry_self_heal = status;
+                        break;
+                case AFR_SELF_HEAL_INVALID:
+                        gf_log_callingfn (this->name, GF_LOG_ERROR, "Invalid"
+                                          "self heal type in action");
+                        break;
+        }
+out:
+        return;
+}
+
+void
+afr_set_local_for_unhealable (afr_local_t *local)
+{
+        afr_self_heal_t  *sh = NULL;
+
+        sh = &local->self_heal;
+
+        local->unhealable = 1;
+        afr_set_self_heal_status (sh, AFR_SELF_HEAL_FAILED);
+}
+
+int
+is_self_heal_failed (afr_self_heal_t *sh, afr_sh_fail_check_type type)
+{
+        afr_sh_status_for_all_type      sh_status = sh->afr_all_sh_status;
+        afr_self_heal_type   sh_type_in_action =  AFR_SELF_HEAL_INVALID;
+        afr_self_heal_status    status = AFR_SELF_HEAL_FAILED;
+        xlator_t                *this = NULL;
+        int                     sh_failed = 0;
+
+        this = THIS;
+
+        if (!sh) {
+                gf_log_callingfn (this->name, GF_LOG_ERROR, "Null self heal "
+                                  "structure");
+                sh_failed = 1;
+                goto out;
+        }
+
+        if (type == AFR_CHECK_ALL) {
+                if ((sh_status.gfid_or_missing_entry_self_heal == AFR_SELF_HEAL_FAILED)
+                    || (sh_status.metadata_self_heal == AFR_SELF_HEAL_FAILED)
+                    || (sh_status.data_self_heal == AFR_SELF_HEAL_FAILED)
+                    || (sh_status.entry_self_heal == AFR_SELF_HEAL_FAILED))
+                sh_failed = 1;
+        } else if (type == AFR_CHECK_SPECIFIC) {
+                sh_type_in_action = sh->sh_type_in_action;
+                switch (sh_type_in_action) {
+                        case AFR_SELF_HEAL_GFID_OR_MISSING_ENTRY:
+                             status = sh_status.gfid_or_missing_entry_self_heal;
+                                break;
+                        case AFR_SELF_HEAL_METADATA:
+                                status = sh_status.metadata_self_heal;
+                                break;
+                        case AFR_SELF_HEAL_ENTRY:
+                                status = sh_status.entry_self_heal;
+                                break;
+                        case AFR_SELF_HEAL_DATA:
+                                status = sh_status.data_self_heal;
+                                break;
+                        case AFR_SELF_HEAL_INVALID:
+                                status = AFR_SELF_HEAL_NOT_ATTEMPTED;
+                                break;
+                }
+                if (status == AFR_SELF_HEAL_FAILED)
+                        sh_failed = 1;
+
+        }
+
+out:
+        return sh_failed;
+}
+
+char *
+get_sh_completion_status (afr_self_heal_status status)
+{
+
+        char *not_attempted       = " is not attempted";
+        char *failed              = " failed";
+        char *started             = " is started";
+        char *sync_begin          = " is successfully completed";
+        char *result              = " has unknown status";
+
+        switch (status)
+        {
+                case AFR_SELF_HEAL_NOT_ATTEMPTED:
+                        result = not_attempted;
+                        break;
+                case AFR_SELF_HEAL_FAILED:
+                        result = failed;
+                        break;
+                case AFR_SELF_HEAL_STARTED:
+                        result = started;
+                        break;
+                case AFR_SELF_HEAL_SYNC_BEGIN:
+                        result = sync_begin;
+                        break;
+        }
+
+        return result;
+
+}
+
+void
+afr_log_self_heal_completion_status (afr_local_t *local, gf_loglevel_t loglvl)
+{
+
+        char sh_log[4096]              = {0};
+        afr_self_heal_t *sh            = &local->self_heal;
+        afr_sh_status_for_all_type   all_status = sh->afr_all_sh_status;
+        xlator_t      *this            = NULL;
+        size_t        off              = 0;
+        int           data_sh          = 0;
+        int           metadata_sh      = 0;
+        int           print_log        = 0;
+
+        this = THIS;
+
+        ADD_FMT_STRING (sh_log, off, "gfid or missing entry",
+                        all_status.gfid_or_missing_entry_self_heal, print_log);
+        ADD_FMT_STRING_SYNC (sh_log, off, "metadata",
+                             all_status.metadata_self_heal, print_log);
+        if (sh->background) {
+                ADD_FMT_STRING_SYNC (sh_log, off, "backgroung data",
+                                all_status.data_self_heal, print_log);
+        } else {
+                ADD_FMT_STRING_SYNC (sh_log, off, "foreground data",
+                                all_status.data_self_heal, print_log);
+        }
+        ADD_FMT_STRING_SYNC (sh_log, off, "entry", all_status.entry_self_heal,
+                             print_log);
+
+        if (AFR_SELF_HEAL_SYNC_BEGIN == all_status.data_self_heal &&
+	    strcmp (sh->data_sh_info, "") && sh->data_sh_info )
+                data_sh = 1;
+        if (AFR_SELF_HEAL_SYNC_BEGIN == all_status.metadata_self_heal &&
+	    strcmp (sh->metadata_sh_info, "") && sh->metadata_sh_info)
+                metadata_sh = 1;
+
+        if (!print_log)
+                return;
+
+        gf_log (this->name, loglvl, "%s %s %s on %s", sh_log,
+                ((data_sh == 1) ? sh->data_sh_info : ""),
+                ((metadata_sh == 1) ? sh->metadata_sh_info : ""),
+                local->loc.path);
+}
diff --git a/xlators/cluster/afr/src/afr-self-heal-common.h b/xlators/cluster/afr/src/afr-self-heal-common.h
index 035fce543..473264776 100644
--- a/xlators/cluster/afr/src/afr-self-heal-common.h
+++ b/xlators/cluster/afr/src/afr-self-heal-common.h
@@ -15,13 +15,6 @@
 #define AFR_SH_MIN_PARTICIPANTS 2
 
 typedef enum {
-        AFR_SELF_HEAL_ENTRY,
-        AFR_SELF_HEAL_METADATA,
-        AFR_SELF_HEAL_DATA,
-        AFR_SELF_HEAL_INVALID = -1,
-} afr_self_heal_type;
-
-typedef enum {
         AFR_LOOKUP_FAIL_CONFLICTS = 1,
         AFR_LOOKUP_FAIL_MISSING_GFIDS = 2,
 } afr_lookup_flags_t;
@@ -98,13 +91,13 @@ int
 afr_sh_entry_impunge_create (call_frame_t *impunge_frame, xlator_t *this,
                              int child_index);
 int
-afr_sh_data_unlock (call_frame_t *frame, xlator_t *this,
+afr_sh_data_unlock (call_frame_t *frame, xlator_t *this, char *dom,
                     afr_lock_cbk_t lock_cbk);
 afr_local_t *
-afr_local_copy (afr_local_t *l, xlator_t *this);
+afr_self_heal_local_init (afr_local_t *l, xlator_t *this);
 int
 afr_sh_data_lock (call_frame_t *frame, xlator_t *this,
-                  off_t start, off_t len, gf_boolean_t block,
+                  off_t start, off_t len, gf_boolean_t block, char *dom,
                   afr_lock_cbk_t success_handler,
                   afr_lock_cbk_t failure_handler);
 void
@@ -133,4 +126,19 @@ int
 afr_sh_erase_pending (call_frame_t *frame, xlator_t *this,
                       afr_transaction_type type, afr_fxattrop_cbk_t cbk,
                       int (*finish)(call_frame_t *frame, xlator_t *this));
+
+void
+afr_set_local_for_unhealable (afr_local_t *local);
+
+int
+is_self_heal_failed (afr_self_heal_t *sh, afr_sh_fail_check_type type);
+
+void
+afr_set_self_heal_status (afr_self_heal_t *sh, afr_self_heal_status status);
+
+void
+afr_log_self_heal_completion_status (afr_local_t *local, gf_loglevel_t  logl);
+
+char*
+afr_get_pending_matrix_str (int32_t *pending_matrix[], xlator_t *this);
 #endif /* __AFR_SELF_HEAL_COMMON_H__ */
diff --git a/xlators/cluster/afr/src/afr-self-heal-data.c b/xlators/cluster/afr/src/afr-self-heal-data.c
index 69e650620..9de26ee56 100644
--- a/xlators/cluster/afr/src/afr-self-heal-data.c
+++ b/xlators/cluster/afr/src/afr-self-heal-data.c
@@ -156,6 +156,25 @@ afr_sh_data_close (call_frame_t *frame, xlator_t *this)
 }
 
 int
+afr_sh_dom_unlock (call_frame_t *frame, xlator_t *this)
+{
+        afr_local_t     *local = NULL;
+        afr_self_heal_t *sh    = NULL;
+        afr_private_t   *priv  = NULL;
+
+        local = frame->local;
+        sh    = &local->self_heal;
+        priv  = this->private;
+
+        if (sh->sh_dom_lock_held)
+                afr_sh_data_unlock (frame, this, priv->sh_domain,
+                                    afr_sh_data_close);
+        else
+                afr_sh_data_close (frame, this);
+        return 0;
+}
+
+int
 afr_sh_data_setattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                          int32_t op_ret, int32_t op_errno, struct iatt *statpre,
                          struct iatt *statpost, dict_t *xdata)
@@ -190,29 +209,20 @@ afr_sh_data_setattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
 }
 
 int
-afr_sh_data_setattr (call_frame_t *frame, xlator_t *this)
+afr_sh_data_setattr (call_frame_t *frame, xlator_t *this, struct iatt* stbuf)
 {
         afr_local_t     *local      = NULL;
         afr_private_t   *priv       = NULL;
         afr_self_heal_t *sh         = NULL;
         int              i          = 0;
         int              call_count = 0;
-        int              source     = 0;
         int32_t          valid      = 0;
-        struct iatt      stbuf      = {0,};
 
         local = frame->local;
         sh    = &local->self_heal;
         priv  = this->private;
 
-        source = sh->source;
-
-        valid |= (GF_SET_ATTR_ATIME | GF_SET_ATTR_MTIME);
-
-        stbuf.ia_atime = sh->buf[source].ia_atime;
-        stbuf.ia_atime_nsec = sh->buf[source].ia_atime_nsec;
-        stbuf.ia_mtime = sh->buf[source].ia_mtime;
-        stbuf.ia_mtime_nsec = sh->buf[source].ia_mtime_nsec;
+        valid = (GF_SET_ATTR_ATIME | GF_SET_ATTR_MTIME);
 
         call_count        = afr_set_elem_count_get (sh->success,
                                                     priv->child_count);
@@ -232,7 +242,7 @@ afr_sh_data_setattr (call_frame_t *frame, xlator_t *this)
                                    (void *) (long) i,
                                    priv->children[i],
                                    priv->children[i]->fops->setattr,
-                                   &local->loc, &stbuf, valid, NULL);
+                                   &local->loc, stbuf, valid, NULL);
 
                 if (!--call_count)
                         break;
@@ -256,7 +266,7 @@ afr_sh_data_setattr_fstat_cbk (call_frame_t *frame, void *cookie,
         GF_ASSERT (sh->source == child_index);
         if (op_ret != -1) {
                 sh->buf[child_index] = *buf;
-                afr_sh_data_setattr (frame, this);
+                afr_sh_data_setattr (frame, this, buf);
         } else {
                 gf_log (this->name, GF_LOG_ERROR, "%s: Failed to set "
                         "time-stamps after self-heal", local->loc.path);
@@ -292,31 +302,45 @@ afr_sh_set_timestamps (call_frame_t *frame, xlator_t *this)
 
 //Fun fact, lock_cbk is being used for both lock & unlock
 int
-afr_sh_data_unlock (call_frame_t *frame, xlator_t *this,
+afr_sh_data_unlock (call_frame_t *frame, xlator_t *this, char *dom,
                     afr_lock_cbk_t lock_cbk)
 {
         afr_local_t         *local    = NULL;
         afr_internal_lock_t *int_lock = NULL;
         afr_self_heal_t     *sh       = NULL;
+        afr_private_t       *priv     = NULL;
+        int                 ret       = 0;
 
         local    = frame->local;
         int_lock = &local->internal_lock;
         sh       = &local->self_heal;
+        priv     = this->private;
 
-        GF_ASSERT (sh->data_lock_held);
-
-        sh->data_lock_held = _gf_false;
+        if (strcmp (dom, this->name) == 0) {
+                sh->data_lock_held = _gf_false;
+        } else if (strcmp (dom, priv->sh_domain) == 0) {
+                sh->sh_dom_lock_held = _gf_false;
+        } else {
+                ret = -1;
+                goto out;
+        }
         int_lock->lock_cbk = lock_cbk;
+        int_lock->domain = dom;
         afr_unlock (frame, this);
 
+out:
+        if (ret) {
+                int_lock->lock_op_ret = -1;
+                int_lock->lock_cbk (frame, this);
+        }
         return 0;
 }
 
 int
 afr_sh_data_finish (call_frame_t *frame, xlator_t *this)
 {
-        afr_local_t   *local = NULL;
-        afr_self_heal_t *sh = NULL;
+        afr_local_t     *local = NULL;
+        afr_self_heal_t *sh    = NULL;
 
         local = frame->local;
         sh = &local->self_heal;
@@ -325,9 +349,9 @@ afr_sh_data_finish (call_frame_t *frame, xlator_t *this)
                 "finishing data selfheal of %s", local->loc.path);
 
         if (sh->data_lock_held)
-                afr_sh_data_unlock (frame, this, afr_sh_data_close);
+                afr_sh_data_unlock (frame, this, this->name, afr_sh_dom_unlock);
         else
-                afr_sh_data_close (frame, this);
+                afr_sh_dom_unlock (frame, this);
 
         return 0;
 }
@@ -344,11 +368,8 @@ afr_sh_data_fail (call_frame_t *frame, xlator_t *this)
         gf_log (this->name, GF_LOG_DEBUG,
                 "finishing failed data selfheal of %s", local->loc.path);
 
-        sh->op_failed = 1;
-        if (sh->data_lock_held)
-                afr_sh_data_unlock (frame, this, afr_sh_data_close);
-        else
-                afr_sh_data_close (frame, this);
+        afr_set_self_heal_status (sh, AFR_SELF_HEAL_FAILED);
+        afr_sh_data_finish (frame, this);
         return 0;
 }
 
@@ -371,13 +392,13 @@ afr_sh_data_erase_pending_cbk (call_frame_t *frame, void *cookie,
                         "log failed on %s for subvol %s, reason: %s",
                         local->loc.path, priv->children[child_index]->name,
                         strerror (op_errno));
-                sh->op_failed = 1;
+                afr_set_self_heal_status (sh, AFR_SELF_HEAL_FAILED);
         }
 
         call_count = afr_frame_return (frame);
 
         if (call_count == 0) {
-                if (sh->op_failed) {
+                if (is_self_heal_failed (sh, AFR_CHECK_SPECIFIC)) {
                         if (sh->old_loop_frame)
                                 sh_loop_finish (sh->old_loop_frame, this);
                         sh->old_loop_frame = NULL;
@@ -389,7 +410,7 @@ afr_sh_data_erase_pending_cbk (call_frame_t *frame, void *cookie,
                         goto out;
                 }
                 GF_ASSERT (sh->old_loop_frame);
-                afr_sh_data_lock (frame, this, 0, 0, _gf_true,
+                afr_sh_data_lock (frame, this, 0, 0, _gf_true, this->name,
                                   afr_post_sh_big_lock_success,
                                   afr_post_sh_big_lock_failure);
         }
@@ -406,6 +427,80 @@ afr_sh_data_erase_pending (call_frame_t *frame, xlator_t *this)
         return 0;
 }
 
+int
+afr_sh_data_fsync_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                       int op_ret, int op_errno, struct iatt *pre,
+                       struct iatt *post, dict_t *xdata)
+{
+        afr_local_t     *local      = NULL;
+        afr_private_t   *priv       = NULL;
+        afr_self_heal_t *sh         = NULL;
+        int             call_count  = 0;
+        int             child_index = (long) cookie;
+
+        local = frame->local;
+        priv = this->private;
+        sh   = &local->self_heal;
+
+        if (op_ret < 0) {
+                gf_log (this->name, GF_LOG_ERROR, "%s: Failed to fsync on "
+                        "%s - %s", local->loc.path,
+                        priv->children[child_index]->name, strerror (op_errno));
+                LOCK (&frame->lock);
+                {
+                        afr_set_self_heal_status (sh, AFR_SELF_HEAL_FAILED);
+                }
+                UNLOCK (&frame->lock);
+                if (sh->old_loop_frame)
+                        sh_loop_finish (sh->old_loop_frame, this);
+                sh->old_loop_frame = NULL;
+        }
+
+        call_count = afr_frame_return (frame);
+        if (call_count == 0) {
+                if (is_self_heal_failed (sh, AFR_CHECK_SPECIFIC))
+                        afr_sh_data_fail (frame, this);
+                else
+                        afr_sh_data_erase_pending (frame, this);
+        }
+        return 0;
+}
+
+/*
+ * Before erasing xattrs, make sure the data is written to disk
+ */
+int
+afr_sh_data_fsync (call_frame_t *frame, xlator_t *this)
+{
+        afr_local_t     *local     = NULL;
+        afr_private_t   *priv      = NULL;
+        afr_self_heal_t *sh        = NULL;
+        int             i          = 0;
+        int             call_count = 0;
+
+        local = frame->local;
+        priv = this->private;
+        sh   = &local->self_heal;
+
+        call_count        = sh->active_sinks;
+        if (call_count == 0) {
+                afr_sh_data_erase_pending (frame, this);
+                return 0;
+        }
+
+        local->call_count = call_count;
+        for (i = 0; i < priv->child_count; i++) {
+                if (!sh->success[i] || sh->sources[i])
+                        continue;
+
+                STACK_WIND_COOKIE (frame, afr_sh_data_fsync_cbk,
+                                   (void *) (long) i, priv->children[i],
+                                   priv->children[i]->fops->fsync,
+                                   sh->healing_fd, 1, NULL);
+        }
+
+        return 0;
+}
 
 static struct afr_sh_algorithm *
 sh_algo_from_name (xlator_t *this, char *name)
@@ -503,7 +598,7 @@ afr_sh_data_sync_prepare (call_frame_t *frame, xlator_t *this)
         local = frame->local;
         sh = &local->self_heal;
 
-        sh->algo_completion_cbk = afr_sh_data_erase_pending;
+        sh->algo_completion_cbk = afr_sh_data_fsync;
         sh->algo_abort_cbk      = afr_sh_data_fail;
 
         sh_algo = afr_sh_data_pick_algo (frame, this);
@@ -539,7 +634,7 @@ afr_sh_data_trim_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                                 local->loc.path,
                                 priv->children[child_index]->name,
                                 strerror (op_errno));
-                        sh->op_failed = 1;
+                        afr_set_self_heal_status (sh, AFR_SELF_HEAL_FAILED);
                 } else {
                         gf_log (this->name, GF_LOG_DEBUG,
                                 "ftruncate of %s on subvolume %s completed",
@@ -552,7 +647,7 @@ afr_sh_data_trim_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
         call_count = afr_frame_return (frame);
 
         if (call_count == 0) {
-                if (sh->op_failed)
+                if (is_self_heal_failed (sh, AFR_CHECK_SPECIFIC))
                         afr_sh_data_fail (frame, this);
                 else
                         afr_sh_data_sync_prepare (frame, this);
@@ -632,6 +727,199 @@ out:
         return ret;
 }
 
+char*
+afr_get_sizes_str (afr_local_t *local, struct iatt *bufs, xlator_t *this)
+{
+        afr_private_t *priv = NULL;
+        int           i     = 0;
+        char          num[1024] = {0};
+        size_t        len = 0;
+        char          *sizes_str = NULL;
+        size_t        off = 0;
+        char          *fmt_str = "%llu bytes on %s, ";
+        char          *child_down =  " %s,";
+        char          *child_unknown = " %s,";
+        int           down_child_present = 0;
+        int           down_count = 0;
+        int           unknown_count = 0;
+        int           unknown_child_present = 0;
+        char          *down_subvol_1 = " down subvolume is ";
+        char          *unknown_subvol_1 = " unknown subvolume is ";
+        char          *down_subvol_2 = " down subvolumes are ";
+        char          *unknown_subvol_2 = " unknown subvolumes are ";
+
+        priv = this->private;
+
+        for (i = 0; i < priv->child_count; i++) {
+                if (local->child_up[i] == 1) {
+                        len += snprintf (num, sizeof (num), fmt_str,
+                                         (unsigned long long) bufs[i].ia_size,
+                                         priv->children[i]->name);
+                } else if (local->child_up[i] == 0) {
+                        len += snprintf (num, sizeof (num), child_down,
+                                         priv->children[i]->name);
+                        if (!down_child_present)
+                                down_child_present = 1;
+                        down_count ++;
+                } else if (local->child_up[i] == -1) {
+                        len += snprintf (num, sizeof (num), child_unknown,
+                                         priv->children[i]->name);
+                        if (!unknown_child_present)
+                                unknown_child_present = 1;
+                        unknown_count++;
+                }
+
+        }
+
+        if (down_child_present) {
+                if (down_count > 1)
+                        len += snprintf (num, sizeof (num), "%s",
+                                         down_subvol_2);
+                else
+                        len += snprintf (num, sizeof (num), "%s",
+                                        down_subvol_1);
+        }
+        if (unknown_child_present) {
+                if (unknown_count > 1)
+                        len += snprintf (num, sizeof (num), "%s",
+                                         unknown_subvol_2);
+                else
+                        len += snprintf (num, sizeof (num), "%s",
+                                         unknown_subvol_1);
+        }
+
+        len++;//for '\0'
+
+        sizes_str = GF_CALLOC (len, sizeof (char), gf_common_mt_char);
+
+        if (!sizes_str)
+                return NULL;
+
+        for (i = 0; i < priv->child_count; i++) {
+                if (local->child_up[i] == 1) {
+                        off += snprintf (sizes_str + off, len - off, fmt_str,
+                                         (unsigned long long) bufs[i].ia_size,
+                                         priv->children[i]->name);
+                }
+        }
+
+        if (down_child_present) {
+                if (down_count > 1) {
+                        off += snprintf (sizes_str + off, len - off, "%s",
+                                         down_subvol_2);
+                } else {
+                        off += snprintf (sizes_str + off, len - off, "%s",
+                                         down_subvol_1);
+                }
+        }
+
+        for (i = 0; i < priv->child_count; i++) {
+                if (local->child_up[i] == 0) {
+                        off += snprintf (sizes_str + off, len - off, child_down,
+                                         priv->children[i]->name);
+                }
+        }
+
+        if (unknown_child_present) {
+                if (unknown_count > 1) {
+                        off += snprintf (sizes_str + off, len - off, "%s",
+                                        unknown_subvol_2);
+                } else {
+                        off += snprintf (sizes_str + off, len - off, "%s",
+                                         unknown_subvol_1);
+                }
+        }
+
+        for (i = 0; i < priv->child_count; i++) {
+                if (local->child_up[i] == -1) {
+                        off += snprintf (sizes_str + off, len - off,
+                                         child_unknown,
+                                         priv->children[i]->name);
+
+                }
+        }
+
+        return sizes_str;
+}
+
+char*
+afr_get_sinks_str (xlator_t *this, afr_local_t *local, afr_self_heal_t *sh)
+{
+        afr_private_t   *priv = NULL;
+        int             i = 0;
+        char            num[1024] = {0};
+        size_t          len = 0;
+        char            *sinks_str = NULL;
+        char            *temp_str = " to sinks ";
+        char            *str_format = " %s,";
+        char            off = 0;
+
+        priv = this->private;
+
+        len += snprintf (num, sizeof (num), "%s", temp_str);
+        for (i = 0; i < priv->child_count; i++) {
+                if ((sh->sources[i] == 0) && (local->child_up[i] == 1)) {
+                        len += snprintf (num, sizeof (num), str_format,
+                                         priv->children[i]->name);
+                }
+        }
+
+        len ++;
+
+        sinks_str = GF_CALLOC (len, sizeof (char), gf_common_mt_char);
+
+        if (!sinks_str)
+                return NULL;
+
+        off += snprintf (sinks_str + off, len - off, "%s", temp_str);
+
+        for (i = 0; i < priv->child_count; i++) {
+                if ((sh->sources[i] == 0) && (local->child_up[i] == 1)) {
+                        off += snprintf (sinks_str + off, len - off,
+                                         str_format,
+                                         priv->children[i]->name);
+                }
+        }
+
+        return sinks_str;
+
+}
+
+
+void
+afr_set_data_sh_info_str (afr_local_t *local, afr_self_heal_t *sh, xlator_t *this)
+{
+        char            *pending_matrix_str = NULL;
+        char            *sizes_str = NULL;
+        char            *sinks_str = NULL;
+        afr_private_t   *priv = NULL;
+
+        priv = this->private;
+
+        pending_matrix_str = afr_get_pending_matrix_str (sh->pending_matrix,
+                                                         this);
+        if (!pending_matrix_str)
+                pending_matrix_str = "";
+
+        sizes_str = afr_get_sizes_str (local, sh->buf, this);
+        if (!sizes_str)
+                sizes_str = "";
+
+        sinks_str = afr_get_sinks_str (this, local, sh);
+        if (!sinks_str)
+                sinks_str = "";
+
+        gf_asprintf (&sh->data_sh_info, " data self heal from %s %s with "
+                     "%s data %s", priv->children[sh->source]->name, sinks_str,
+                     sizes_str, pending_matrix_str);
+
+        if (pending_matrix_str && strcmp (pending_matrix_str, ""))
+                GF_FREE (pending_matrix_str);
+
+        if (sizes_str && strcmp (sizes_str, ""))
+                GF_FREE (sizes_str);
+}
+
 void
 afr_sh_data_fix (call_frame_t *frame, xlator_t *this)
 {
@@ -653,7 +941,7 @@ afr_sh_data_fix (call_frame_t *frame, xlator_t *this)
 
         if (sh->background && sh->unwind && !sh->unwound) {
                 sh->unwind (sh->orig_frame, this, sh->op_ret, sh->op_errno,
-                            sh->op_failed);
+                            is_self_heal_failed (sh, AFR_CHECK_SPECIFIC));
                 sh->unwound = _gf_true;
         }
 
@@ -672,6 +960,7 @@ afr_sh_data_fix (call_frame_t *frame, xlator_t *this)
                 sh->active_sinks);
 
         sh->actual_sh_started = _gf_true;
+        afr_set_self_heal_status (sh, AFR_SELF_HEAL_SYNC_BEGIN);
         afr_sh_data_trim_sinks (frame, this);
 }
 
@@ -683,6 +972,9 @@ afr_sh_data_fxattrop_fstat_done (call_frame_t *frame, xlator_t *this)
         afr_private_t   *priv = NULL;
         int              nsources = 0;
         int              ret = 0;
+        int             *old_sources = NULL;
+        int             tstamp_source = 0;
+        int             i = 0;
 
         local = frame->local;
         sh = &local->self_heal;
@@ -690,6 +982,13 @@ afr_sh_data_fxattrop_fstat_done (call_frame_t *frame, xlator_t *this)
 
         gf_log (this->name, GF_LOG_DEBUG, "Pending matrix for: %s",
                 lkowner_utoa (&frame->root->lk_owner));
+        if (sh->sync_done) {
+                //store sources before sync so that mtime can be set using the
+                //iatt buf from one of them.
+                old_sources = alloca (priv->child_count*sizeof (*old_sources));
+                memcpy (old_sources, sh->sources,
+                        priv->child_count * sizeof (*old_sources));
+        }
 
         nsources = afr_build_sources (this, sh->xattr, sh->buf, sh->pending_matrix,
                                       sh->sources, sh->success_children,
@@ -720,6 +1019,7 @@ afr_sh_data_fxattrop_fstat_done (call_frame_t *frame, xlator_t *this)
         }
 
         afr_set_split_brain (this, sh->inode, DONT_KNOW, NO_SPB);
+
         ret = afr_sh_inode_set_read_ctx (sh, this);
         if (ret) {
                 gf_log (this->name, GF_LOG_DEBUG,
@@ -730,8 +1030,18 @@ afr_sh_data_fxattrop_fstat_done (call_frame_t *frame, xlator_t *this)
         }
 
         if (sh->sync_done) {
-                afr_sh_data_setattr (frame, this);
+                /* Perform setattr from one of the old_sources if possible
+                 * Because only they have the correct mtime, the new sources
+                 * (i.e. old sinks) have mtime from last writev in sync.
+                 */
+                tstamp_source = sh->source;
+                for (i = 0; i < priv->child_count; i++) {
+                        if (old_sources[i] && sh->sources[i])
+                                tstamp_source = i;
+                }
+                afr_sh_data_setattr (frame, this, &sh->buf[tstamp_source]);
         } else {
+                afr_set_data_sh_info_str (local, sh, this);
                 if (nsources == 0) {
                         gf_log (this->name, GF_LOG_DEBUG,
                                 "No self-heal needed for %s",
@@ -1089,6 +1399,22 @@ afr_sh_data_big_lock_success (call_frame_t *frame, xlator_t *this)
 }
 
 int
+afr_sh_dom_lock_success (call_frame_t *frame, xlator_t *this)
+{
+        afr_local_t   *local = NULL;
+        afr_self_heal_t *sh = NULL;
+
+        local = frame->local;
+        sh = &local->self_heal;
+
+        sh->sh_dom_lock_held = _gf_true;
+        afr_sh_data_lock (frame, this, 0, 0, _gf_true, this->name,
+                          afr_sh_data_big_lock_success,
+                          afr_sh_data_fail);
+        return 0;
+}
+
+int
 afr_sh_data_post_blocking_inodelk_cbk (call_frame_t *frame, xlator_t *this)
 {
         afr_internal_lock_t *int_lock = NULL;
@@ -1152,9 +1478,11 @@ afr_sh_data_post_nonblocking_inodelk_cbk (call_frame_t *frame, xlator_t *this)
 }
 
 int
-afr_sh_data_lock_rec (call_frame_t *frame, xlator_t *this, off_t start, off_t len)
+afr_sh_data_lock_rec (call_frame_t *frame, xlator_t *this, char *dom,
+                      off_t start, off_t len)
 {
         afr_internal_lock_t *int_lock = NULL;
+        afr_inodelk_t       *inodelk  = NULL;
         afr_local_t         *local    = NULL;
 
         local    = frame->local;
@@ -1165,11 +1493,14 @@ afr_sh_data_lock_rec (call_frame_t *frame, xlator_t *this, off_t start, off_t le
 
         afr_set_lock_number (frame, this);
 
-        int_lock->lk_flock.l_start = start;
-        int_lock->lk_flock.l_len   = len;
-        int_lock->lk_flock.l_type  = F_WRLCK;
         int_lock->lock_cbk         = afr_sh_data_post_nonblocking_inodelk_cbk;
 
+        int_lock->domain = dom;
+        inodelk = afr_get_inodelk (int_lock, int_lock->domain);
+        inodelk->flock.l_start = start;
+        inodelk->flock.l_len   = len;
+        inodelk->flock.l_type  = F_WRLCK;
+
         afr_nonblocking_inodelk (frame, this);
 
         return 0;
@@ -1213,7 +1544,7 @@ afr_post_sh_big_lock_failure (call_frame_t *frame, xlator_t *this)
 int
 afr_sh_data_lock (call_frame_t *frame, xlator_t *this,
                   off_t start, off_t len, gf_boolean_t block,
-                  afr_lock_cbk_t success_handler,
+                  char *dom, afr_lock_cbk_t success_handler,
                   afr_lock_cbk_t failure_handler)
 {
         afr_local_t *   local = NULL;
@@ -1225,7 +1556,7 @@ afr_sh_data_lock (call_frame_t *frame, xlator_t *this,
         sh->data_lock_success_handler = success_handler;
         sh->data_lock_failure_handler = failure_handler;
 	sh->data_lock_block = block;
-        return afr_sh_data_lock_rec (frame, this, start, len);
+        return afr_sh_data_lock_rec (frame, this, dom, start, len);
 }
 
 int
@@ -1237,7 +1568,6 @@ afr_sh_data_open_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
         afr_private_t   *priv = NULL;
         int              call_count = 0;
         int              child_index = 0;
-	gf_boolean_t	 block = _gf_true;
 
         local = frame->local;
         sh = &local->self_heal;
@@ -1257,7 +1587,7 @@ afr_sh_data_open_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                                 local->loc.path,
                                 priv->children[child_index]->name,
                                 strerror (op_errno));
-                        sh->op_failed = 1;
+                        afr_set_self_heal_status (sh, AFR_SELF_HEAL_FAILED);
                 } else {
                         gf_log (this->name, GF_LOG_TRACE,
                                 "open of %s succeeded on child %s",
@@ -1270,7 +1600,7 @@ afr_sh_data_open_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
         call_count = afr_frame_return (frame);
 
         if (call_count == 0) {
-                if (sh->op_failed) {
+                if (is_self_heal_failed (sh, AFR_CHECK_SPECIFIC)) {
                         afr_sh_data_fail (frame, this);
                         return 0;
                 }
@@ -1279,15 +1609,8 @@ afr_sh_data_open_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                         "fd for %s opened, commencing sync",
                         local->loc.path);
 
-		/*
-		 * The read and write self-heal trigger codepaths do not provide
-		 * an unwind callback. We run a trylock in these codepaths
-		 * because we are sensitive to locking latency.
-		 */
-		block = sh->unwind ? _gf_true : _gf_false;
-                afr_sh_data_lock (frame, this, 0, 0, block,
-                                  afr_sh_data_big_lock_success,
-                                  afr_sh_data_fail);
+                afr_sh_data_lock (frame, this, 0, 0, _gf_true, priv->sh_domain,
+                                  afr_sh_dom_lock_success, afr_sh_data_fail);
         }
 
         return 0;
@@ -1392,18 +1715,31 @@ afr_can_start_data_self_heal (afr_self_heal_t *sh, afr_private_t *priv)
 int
 afr_self_heal_data (call_frame_t *frame, xlator_t *this)
 {
-        afr_local_t   *local = NULL;
-        afr_self_heal_t *sh = NULL;
-        afr_private_t *priv = this->private;
+        afr_local_t     *local = NULL;
+        afr_self_heal_t *sh    = NULL;
+        afr_private_t   *priv  = this->private;
+        int             ret    = -1;
 
         local = frame->local;
         sh = &local->self_heal;
 
+        sh->sh_type_in_action = AFR_SELF_HEAL_DATA;
+
         if (afr_can_start_data_self_heal (sh, priv)) {
+                afr_set_self_heal_status (sh, AFR_SELF_HEAL_STARTED);
+                ret = afr_inodelk_init (&local->internal_lock.inodelk[1],
+                                        priv->sh_domain, priv->child_count);
+                if (ret < 0) {
+                        afr_set_self_heal_status (sh, AFR_SELF_HEAL_FAILED);
+                        afr_sh_data_done (frame, this);
+                        return 0;
+                }
+
                 if (IA_ISREG (sh->type)) {
                         afr_sh_data_open (frame, this);
                 } else {
                         afr_sh_data_lock (frame, this, 0, 0, _gf_true,
+                                          this->name,
                                           afr_sh_non_reg_lock_success,
                                           afr_sh_data_fail);
                 }
diff --git a/xlators/cluster/afr/src/afr-self-heal-entry.c b/xlators/cluster/afr/src/afr-self-heal-entry.c
index c3c9f9fca..53491a1d7 100644
--- a/xlators/cluster/afr/src/afr-self-heal-entry.c
+++ b/xlators/cluster/afr/src/afr-self-heal-entry.c
@@ -162,7 +162,7 @@ afr_sh_entry_erase_pending (call_frame_t *frame, xlator_t *this)
         sh = &local->self_heal;
 
         if (sh->entries_skipped) {
-                sh->op_failed = _gf_true;
+                afr_set_self_heal_status (sh, AFR_SELF_HEAL_FAILED);
                 goto out;
         }
         afr_sh_erase_pending (frame, this, AFR_ENTRY_TRANSACTION,
@@ -613,6 +613,19 @@ out:
         return 0;
 }
 
+static gf_boolean_t
+can_skip_entry_self_heal (char *name, loc_t *parent_loc)
+{
+        if (strcmp (name, ".") == 0) {
+                return _gf_true;
+        } else if (strcmp (name, "..") == 0) {
+                return _gf_true;
+        } else if (loc_is_root (parent_loc) &&
+                   (strcmp (name, GF_REPLICATE_TRASH_DIR) == 0)) {
+                return _gf_true;
+        }
+        return _gf_false;
+}
 
 int
 afr_sh_entry_expunge_entry (call_frame_t *frame, xlator_t *this,
@@ -640,13 +653,7 @@ afr_sh_entry_expunge_entry (call_frame_t *frame, xlator_t *this,
         sh->expunge_done = afr_sh_entry_expunge_entry_done;
 
         name = entry->d_name;
-
-        if ((strcmp (name, ".") == 0)
-            || (strcmp (name, "..") == 0)) {
-
-                gf_log (this->name, GF_LOG_TRACE,
-                        "skipping inspection of %s under %s",
-                        name, local->loc.path);
+        if (can_skip_entry_self_heal (name, &local->loc)) {
                 op_ret = 0;
                 goto out;
         }
@@ -799,7 +806,7 @@ afr_sh_entry_expunge_all (call_frame_t *frame, xlator_t *this)
         active_src = next_active_sink (frame, this, sh->active_source);
         sh->active_source = active_src;
 
-        if (sh->op_failed) {
+        if (is_self_heal_failed (sh, AFR_CHECK_SPECIFIC)) {
                 goto out;
         }
 
@@ -1256,6 +1263,35 @@ afr_sh_entry_impunge_mknod (call_frame_t *impunge_frame, xlator_t *this,
                 gf_log (this->name, GF_LOG_INFO, "%s: gfid set failed",
                         impunge_local->loc.path);
 
+        /*
+         * Reason for adding GLUSTERFS_INTERNAL_FOP_KEY :
+         *
+         * Problem:
+         * While a brick is down in a replica pair, lets say the user creates
+         * one file(file-A) and a hard link to that file(h-file-A). After the
+         * brick comes back up, entry self-heal is attempted on parent dir of
+         * these two files. As part of readdir in self-heal it reads both the
+         * entries file-A and h-file-A for both of them it does name less lookup
+         * to check if there are any hardlinks already present in the
+         * destination brick. It finds that there are no hard links already
+         * present for files file-A, h-file-A. Self-heal does mknods for both
+         * file-A and h-file-A. This leads to file-A and h-file-A not being
+         * hardlinks anymore.
+         *
+         * Fix: (More like shrinking of race-window, the race itself is still
+         * present in posix-mknod).
+         * If mknod comes with the presence of GLUSTERFS_INTERNAL_FOP_KEY then
+         * posix_mknod checks if there are already any gfid-links and does
+         * link() instead of mknod. There still can be a race where two
+         * posix_mknods same gfid see that
+         * gfid-link file is not present and proceeds with mknods and result in
+         * two different files with same gfid.
+         */
+        ret = dict_set_str (dict, GLUSTERFS_INTERNAL_FOP_KEY, "yes");
+        if (ret)
+                gf_log (this->name, GF_LOG_INFO, "%s: %s set failed",
+                        impunge_local->loc.path, GLUSTERFS_INTERNAL_FOP_KEY);
+
         STACK_WIND_COOKIE (impunge_frame, afr_sh_entry_impunge_newfile_cbk,
                            (void *) (long) child_index,
                            priv->children[child_index],
@@ -1872,12 +1908,7 @@ afr_sh_entry_impunge_entry (call_frame_t *frame, xlator_t *this,
         active_src = sh->active_source;
         sh->impunge_done = afr_sh_entry_impunge_entry_done;
 
-        if ((strcmp (entry->d_name, ".") == 0)
-            || (strcmp (entry->d_name, "..") == 0)) {
-
-                gf_log (this->name, GF_LOG_TRACE,
-                        "skipping inspection of %s under %s",
-                        entry->d_name, local->loc.path);
+        if (can_skip_entry_self_heal (entry->d_name, &local->loc)) {
                 op_ret = 0;
                 goto out;
         }
@@ -1946,7 +1977,7 @@ afr_sh_entry_impunge_readdir_cbk (call_frame_t *frame, void *cookie,
                                 local->loc.path,
                                 priv->children[active_src]->name,
                                 strerror (op_errno));
-                        sh->op_failed = 1;
+                        afr_set_self_heal_status (sh, AFR_SELF_HEAL_FAILED);
                 } else {
                         gf_log (this->name, GF_LOG_TRACE,
                                 "readdir of %s on subvolume %s complete",
@@ -2019,7 +2050,7 @@ afr_sh_entry_impunge_all (call_frame_t *frame, xlator_t *this)
         active_src = next_active_source (frame, this, sh->active_source);
         sh->active_source = active_src;
 
-        if (sh->op_failed) {
+        if (is_self_heal_failed (sh, AFR_CHECK_SPECIFIC)) {
                 afr_sh_entry_finish (frame, this);
                 return 0;
         }
@@ -2068,7 +2099,7 @@ afr_sh_entry_opendir_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                                 local->loc.path,
                                 priv->children[child_index]->name,
                                 strerror (op_errno));
-                        sh->op_failed = 1;
+                        afr_set_self_heal_status (sh, AFR_SELF_HEAL_FAILED);
                 }
         }
         UNLOCK (&frame->lock);
@@ -2076,7 +2107,7 @@ afr_sh_entry_opendir_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
         call_count = afr_frame_return (frame);
 
         if (call_count == 0) {
-                if (sh->op_failed) {
+                if (is_self_heal_failed (sh, AFR_CHECK_SPECIFIC)) {
                         afr_sh_entry_finish (frame, this);
                         return 0;
                 }
@@ -2209,6 +2240,7 @@ afr_sh_entry_sync_prepare (call_frame_t *frame, xlator_t *this)
                         local->loc.path);
 
         sh->actual_sh_started = _gf_true;
+        afr_set_self_heal_status (sh, AFR_SELF_HEAL_SYNC_BEGIN);
         afr_sh_entry_open (frame, this);
 
         return 0;
@@ -2231,7 +2263,7 @@ afr_sh_entry_fix (call_frame_t *frame, xlator_t *this,
         priv = this->private;
 
         if (op_ret < 0) {
-                sh->op_failed = 1;
+                afr_set_self_heal_status (sh, AFR_SELF_HEAL_FAILED);
                 afr_sh_set_error (sh, op_errno);
                 afr_sh_entry_finish (frame, this);
                 goto out;
@@ -2294,7 +2326,7 @@ afr_sh_post_nonblocking_entry_cbk (call_frame_t *frame, xlator_t *this)
         if (int_lock->lock_op_ret < 0) {
                 gf_log (this->name, GF_LOG_ERROR, "Non Blocking entrylks "
                         "failed for %s.", local->loc.path);
-                sh->op_failed = 1;
+                afr_set_self_heal_status (sh, AFR_SELF_HEAL_FAILED);
                 afr_sh_entry_done (frame, this);
         } else {
 
@@ -2313,14 +2345,18 @@ afr_sh_post_nonblocking_entry_cbk (call_frame_t *frame, xlator_t *this)
 int
 afr_self_heal_entry (call_frame_t *frame, xlator_t *this)
 {
-        afr_local_t   *local = NULL;
+        afr_local_t     *local = NULL;
         afr_private_t   *priv = NULL;
-
+        afr_self_heal_t *sh = NULL;
 
         priv = this->private;
         local = frame->local;
+        sh = &local->self_heal;
+
+        sh->sh_type_in_action = AFR_SELF_HEAL_ENTRY;
 
         if (local->self_heal.do_entry_self_heal && priv->entry_self_heal) {
+                afr_set_self_heal_status (sh, AFR_SELF_HEAL_STARTED);
                 afr_sh_entrylk (frame, this, &local->loc, NULL,
                                 afr_sh_post_nonblocking_entry_cbk);
         } else {
diff --git a/xlators/cluster/afr/src/afr-self-heal-metadata.c b/xlators/cluster/afr/src/afr-self-heal-metadata.c
index 9d512c28d..fd5da6cfd 100644
--- a/xlators/cluster/afr/src/afr-self-heal-metadata.c
+++ b/xlators/cluster/afr/src/afr-self-heal-metadata.c
@@ -97,7 +97,7 @@ afr_sh_metadata_fail (call_frame_t *frame, xlator_t *this)
         local    = frame->local;
         sh       = &local->self_heal;
 
-        sh->op_failed = 1;
+        afr_set_self_heal_status (sh, AFR_SELF_HEAL_FAILED);
         afr_sh_metadata_finish (frame, this);
         return 0;
 }
@@ -180,8 +180,13 @@ afr_sh_metadata_sync_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
 
         call_count = afr_frame_return (frame);
 
-        if (call_count == 0)
+        if (call_count == 0) {
+                if (local->xattr_req) {
+                        dict_unref (local->xattr_req);
+                        local->xattr_req = NULL;
+                }
                 afr_sh_metadata_erase_pending (frame, this);
+        }
 
         return 0;
 }
@@ -207,6 +212,86 @@ afr_sh_metadata_xattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
         return 0;
 }
 
+int
+afr_sh_removexattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                        int32_t op_ret, int32_t op_errno,
+                        dict_t *xdata)
+{
+        int            i     = 0;
+        afr_private_t *priv  = NULL;
+        afr_local_t   *local = NULL;
+
+        priv = this->private;
+        local = frame->local;
+
+        if (op_ret < 0) {
+                afr_sh_metadata_sync_cbk (frame, cookie,
+                                          this, -1, op_errno, xdata);
+                goto out;
+        }
+
+        i = (long) cookie;
+
+        STACK_WIND_COOKIE (frame, afr_sh_metadata_xattr_cbk,
+                           (void *) (long) i,
+                           priv->children[i],
+                           priv->children[i]->fops->setxattr,
+                           &local->loc, local->xattr_req, 0, NULL);
+
+ out:
+        return 0;
+}
+
+inline void
+afr_prune_special_keys (dict_t *xattr_dict)
+{
+        dict_del (xattr_dict, GF_SELINUX_XATTR_KEY);
+}
+
+inline void
+afr_prune_pending_keys (dict_t *xattr_dict, afr_private_t *priv)
+{
+        int i = 0;
+
+        for (; i < priv->child_count; i++) {
+                dict_del (xattr_dict, priv->pending_key[i]);
+        }
+}
+
+int
+afr_sh_getxattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                     int32_t op_ret, int32_t op_errno, dict_t *xattr,
+                     dict_t *xdata)
+{
+        int            i     = 0;
+        afr_private_t *priv  = NULL;
+        afr_local_t   *local = NULL;
+
+        priv = this->private;
+        local = frame->local;
+
+        if (op_ret < 0) {
+                afr_sh_metadata_sync_cbk (frame, cookie,
+                                          this, -1, op_errno, xdata);
+                goto out;
+        }
+
+        afr_prune_pending_keys (xattr, priv);
+
+        afr_prune_special_keys (xattr);
+
+        i = (long) cookie;
+
+        /* send removexattr in bulk via xdata */
+        STACK_WIND_COOKIE (frame, afr_sh_removexattr_cbk,
+                           cookie,
+                           priv->children[i],
+                           priv->children[i]->fops->removexattr,
+                           &local->loc, "", xattr);
+
+ out:
+        return 0;
+}
 
 int
 afr_sh_metadata_sync (call_frame_t *frame, xlator_t *this, dict_t *xattr)
@@ -232,9 +317,10 @@ afr_sh_metadata_sync (call_frame_t *frame, xlator_t *this, dict_t *xattr)
         /*
          * 2 calls per sink - setattr, setxattr
          */
-        if (xattr)
+        if (xattr) {
                 call_count = active_sinks * 2;
-        else
+                local->xattr_req = dict_ref (xattr);
+        } else
                 call_count = active_sinks;
 
         local->call_count = call_count;
@@ -277,11 +363,11 @@ afr_sh_metadata_sync (call_frame_t *frame, xlator_t *this, dict_t *xattr)
                 if (!xattr)
                         continue;
 
-                STACK_WIND_COOKIE (frame, afr_sh_metadata_xattr_cbk,
+                STACK_WIND_COOKIE (frame, afr_sh_getxattr_cbk,
                                    (void *) (long) i,
                                    priv->children[i],
-                                   priv->children[i]->fops->setxattr,
-                                   &local->loc, xattr, 0, NULL);
+                                   priv->children[i]->fops->getxattr,
+                                   &local->loc, NULL, NULL);
                 call_count--;
         }
 
@@ -299,8 +385,6 @@ afr_sh_metadata_getxattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
         afr_private_t   *priv = NULL;
         int              source = 0;
 
-        int i;
-
         local = frame->local;
         sh = &local->self_heal;
         priv = this->private;
@@ -315,16 +399,147 @@ afr_sh_metadata_getxattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
 
                 afr_sh_metadata_sync (frame, this, NULL);
         } else {
-                for (i = 0; i < priv->child_count; i++) {
-                        dict_del (xattr, priv->pending_key[i]);
-                }
-
+                afr_prune_pending_keys (xattr, priv);
                 afr_sh_metadata_sync (frame, this, xattr);
         }
 
         return 0;
 }
 
+static void
+afr_set_metadata_sh_info_str (afr_local_t *local, afr_self_heal_t *sh,
+                              xlator_t *this)
+{
+        afr_private_t    *priv = NULL;
+        int              i = 0;
+        char             num[1024] = {0};
+        size_t           len = 0;
+        char             *string = NULL;
+        size_t           off = 0;
+        char             *source_child =  " from source %s to";
+        char             *format = " %s, ";
+        char             *string_msg = " metadata self heal";
+        char             *pending_matrix_str = NULL;
+        int              down_child_present = 0;
+        int              unknown_child_present = 0;
+        char             *down_subvol_1 = " down subvolume is ";
+        char             *unknown_subvol_1 = " unknown subvolume is";
+        char             *down_subvol_2 = " down subvolumes are ";
+        char             *unknown_subvol_2 = " unknown subvolumes are ";
+        int              down_count = 0;
+        int              unknown_count = 0;
+
+        priv = this->private;
+
+        pending_matrix_str = afr_get_pending_matrix_str (sh->pending_matrix,
+                                                         this);
+
+        if (!pending_matrix_str)
+                pending_matrix_str = "";
+
+        len += snprintf (num, sizeof (num), "%s", string_msg);
+
+        for (i = 0; i < priv->child_count; i++) {
+                if ((sh->source == i) && (local->child_up[i] == 1)) {
+                        len += snprintf (num, sizeof (num), source_child,
+                                         priv->children[i]->name);
+                } else if ((local->child_up[i] == 1) && (sh->sources[i] == 0)) {
+                        len += snprintf (num, sizeof (num), format,
+                                         priv->children[i]->name);
+                } else if (local->child_up[i] == 0) {
+                        len += snprintf (num, sizeof (num), format,
+                                         priv->children[i]->name);
+                        if (!down_child_present)
+                                down_child_present = 1;
+                        down_count++;
+                } else if (local->child_up[i] == -1) {
+                        len += snprintf (num, sizeof (num), format,
+                                         priv->children[i]->name);
+                        if (!unknown_child_present)
+                                unknown_child_present = 1;
+                        unknown_count++;
+                }
+        }
+
+        if (down_child_present) {
+                if (down_count > 1) {
+                        len += snprintf (num, sizeof (num), "%s",
+                                         down_subvol_2);
+                } else {
+                        len += snprintf (num, sizeof (num), "%s",
+                                         down_subvol_1);
+                }
+        }
+        if (unknown_child_present) {
+                if (unknown_count > 1) {
+                        len += snprintf (num, sizeof (num), "%s",
+                                         unknown_subvol_2);
+                } else {
+                        len += snprintf (num, sizeof (num), "%s",
+                                         unknown_subvol_1);
+                }
+        }
+
+        len ++;
+
+        string = GF_CALLOC (len, sizeof (char), gf_common_mt_char);
+        if (!string)
+                return;
+
+        off += snprintf (string + off, len - off, "%s", string_msg);
+        for (i=0; i < priv->child_count; i++) {
+                if ((sh->source == i) && (local->child_up[i] == 1))
+                        off += snprintf (string + off, len - off, source_child,
+                                         priv->children[i]->name);
+        }
+
+        for (i = 0; i < priv->child_count; i++) {
+                if ((local->child_up[i] == 1)&& (sh->sources[i] == 0))
+                        off += snprintf (string + off, len - off, format,
+                                         priv->children[i]->name);
+        }
+
+        if (down_child_present) {
+                if (down_count > 1) {
+                        off += snprintf (string + off, len - off, "%s",
+                                         down_subvol_2);
+                } else {
+                        off += snprintf (string + off, len - off, "%s",
+                                         down_subvol_1);
+                }
+        }
+
+        for (i = 0; i < priv->child_count; i++) {
+                if (local->child_up[i] == 0)
+                        off += snprintf (string + off, len - off, format,
+                                         priv->children[i]->name);
+        }
+
+        if (unknown_child_present) {
+                if (unknown_count > 1) {
+                        off += snprintf (string + off, len - off, "%s",
+                                 unknown_subvol_2);
+                } else {
+                        off += snprintf (string + off, len - off, "%s",
+                                         unknown_subvol_1);
+                }
+        }
+
+        for (i = 0; i < priv->child_count; i++) {
+                if (local->child_up[i] == -1)
+                        off += snprintf (string + off, len - off, format,
+                                         priv->children[i]->name);
+        }
+
+        gf_asprintf (&sh->metadata_sh_info, "%s metadata %s,", string,
+                     pending_matrix_str);
+
+        if (pending_matrix_str && strcmp (pending_matrix_str, ""))
+                GF_FREE (pending_matrix_str);
+
+        if (string && strcmp (string, ""))
+                GF_FREE (string);
+}
 
 int
 afr_sh_metadata_sync_prepare (call_frame_t *frame, xlator_t *this)
@@ -355,6 +570,8 @@ afr_sh_metadata_sync_prepare (call_frame_t *frame, xlator_t *this)
                 sh->active_sinks);
 
         sh->actual_sh_started = _gf_true;
+        afr_set_self_heal_status (sh, AFR_SELF_HEAL_SYNC_BEGIN);
+        afr_set_metadata_sh_info_str (local, sh, this);
         STACK_WIND (frame, afr_sh_metadata_getxattr_cbk,
                     priv->children[source],
                     priv->children[source]->fops->getxattr,
@@ -380,7 +597,7 @@ afr_sh_metadata_fix (call_frame_t *frame, xlator_t *this,
         priv = this->private;
 
         if (op_ret < 0) {
-                sh->op_failed = 1;
+                afr_set_self_heal_status (sh, AFR_SELF_HEAL_FAILED);
                 afr_sh_set_error (sh, op_errno);
                 afr_sh_metadata_finish (frame, this);
                 goto out;
@@ -498,19 +715,22 @@ int
 afr_sh_metadata_lock (call_frame_t *frame, xlator_t *this)
 {
         afr_internal_lock_t *int_lock = NULL;
+        afr_inodelk_t       *inodelk  = NULL;
         afr_local_t         *local    = NULL;
 
         local    = frame->local;
         int_lock = &local->internal_lock;
 
+        int_lock->domain           = this->name;
+        inodelk = afr_get_inodelk (int_lock, int_lock->domain);
         int_lock->transaction_lk_type = AFR_SELFHEAL_LK;
         int_lock->selfheal_lk_type    = AFR_METADATA_SELF_HEAL_LK;
 
         afr_set_lock_number (frame, this);
 
-        int_lock->lk_flock.l_start = LLONG_MAX - 1;
-        int_lock->lk_flock.l_len   = 0;
-        int_lock->lk_flock.l_type  = F_WRLCK;
+        inodelk->flock.l_start = LLONG_MAX - 1;
+        inodelk->flock.l_len   = 0;
+        inodelk->flock.l_type  = F_WRLCK;
         int_lock->lock_cbk         = afr_sh_metadata_post_nonblocking_inodelk_cbk;
 
         afr_nonblocking_inodelk (frame, this);
@@ -537,8 +757,10 @@ afr_self_heal_metadata (call_frame_t *frame, xlator_t *this)
 
         local = frame->local;
         sh = &local->self_heal;
+        sh->sh_type_in_action = AFR_SELF_HEAL_METADATA;
 
         if (afr_can_start_metadata_self_heal (sh, priv)) {
+                afr_set_self_heal_status (sh, AFR_SELF_HEAL_STARTED);
                 afr_sh_metadata_lock (frame, this);
         } else {
                 afr_sh_metadata_done (frame, this);
diff --git a/xlators/cluster/afr/src/afr-self-heald.c b/xlators/cluster/afr/src/afr-self-heald.c
index 37bc224f5..1b48a1bca 100644
--- a/xlators/cluster/afr/src/afr-self-heald.c
+++ b/xlators/cluster/afr/src/afr-self-heald.c
@@ -25,7 +25,8 @@ typedef enum {
 
 typedef enum {
         HEAL = 1,
-        INFO
+        INFO,
+        STATISTICS_TO_BE_HEALED,
 } shd_crawl_op;
 
 typedef struct shd_dump {
@@ -84,6 +85,33 @@ _loc_assign_gfid_path (loc_t *loc)
 }
 
 void
+_destroy_crawl_event_data (void *data)
+{
+        shd_crawl_event_t        *crawl_event = NULL;
+
+        if (!data)
+                goto out;
+
+        crawl_event = (shd_crawl_event_t *)data;
+        GF_FREE (crawl_event->start_time_str);
+        GF_FREE (crawl_event->end_time_str);
+
+out:
+        return;
+}
+
+void
+_destroy_shd_event_data (void *data)
+{
+        shd_event_t             *event = NULL;
+        if (!data)
+                goto out;
+        event = (shd_event_t*)data;
+        GF_FREE (event->path);
+out:
+        return;
+}
+void
 shd_cleanup_event (void *event)
 {
         shd_event_t *shd_event = event;
@@ -128,6 +156,123 @@ _build_index_loc (xlator_t *this, loc_t *loc, char *name, loc_t *parent)
 }
 
 int
+_add_crawl_stats_to_dict (xlator_t *this, dict_t *output, int child,
+                          shd_crawl_event_t *shd_event, struct timeval *tv)
+{
+        int             ret = 0;
+        uint64_t        count = 0;
+        char            key[256] = {0};
+        int             xl_id = 0;
+        uint64_t        healed_count = 0;
+        uint64_t        split_brain_count = 0;
+        uint64_t        heal_failed_count = 0;
+        char            *start_time_str = NULL;
+        char            *end_time_str = NULL;
+        char            *crawl_type = NULL;
+        int             progress = -1;
+
+        healed_count = shd_event->healed_count;
+        split_brain_count = shd_event->split_brain_count;
+        heal_failed_count = shd_event->heal_failed_count;
+        start_time_str = shd_event->start_time_str;
+        end_time_str = shd_event->end_time_str;
+        crawl_type = shd_event->crawl_type;
+
+        if (!start_time_str) {
+                ret = -1;
+                goto out;
+        }
+
+
+        ret = dict_get_int32 (output, this->name, &xl_id);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "xl does not have id");
+                goto out;
+        }
+
+        snprintf (key, sizeof (key), "statistics-%d-%d-count", xl_id, child);
+        ret = dict_get_uint64 (output, key, &count);
+
+        snprintf (key, sizeof (key), "statistics_healed_cnt-%d-%d-%"PRIu64,
+                  xl_id, child, count);
+        ret = dict_set_uint64(output, key, healed_count);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Could not add statistics_"
+                        "healed_count to outout");
+                goto out;
+         }
+        snprintf (key, sizeof (key), "statistics_sb_cnt-%d-%d-%"PRIu64,
+                  xl_id, child, count);
+        ret = dict_set_uint64 (output, key, split_brain_count);
+         if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Could not add statistics_"
+                        "split_brain_count to outout");
+                goto out;
+        }
+        snprintf (key, sizeof (key), "statistics_crawl_type-%d-%d-%"PRIu64,
+                  xl_id, child, count);
+        ret = dict_set_dynstr (output, key, gf_strdup (crawl_type));
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Could not add statistics_"
+                        "crawl_type to output");
+                goto out;
+        }
+        snprintf (key, sizeof (key), "statistics_heal_failed_cnt-%d-%d-%"PRIu64,
+                  xl_id, child, count);
+        ret = dict_set_uint64 (output, key, heal_failed_count);
+         if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Could not add statistics_"
+                        "healed_failed_count to outout");
+                goto out;
+        }
+        snprintf (key, sizeof (key), "statistics_strt_time-%d-%d-%"PRIu64,
+                  xl_id, child, count);
+        ret = dict_set_dynstr (output, key, gf_strdup(start_time_str));
+
+         if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Could not add statistics_"
+                        "crawl_start_time to outout");
+                goto out;
+        }
+
+        snprintf (key, sizeof (key), "statistics_end_time-%d-%d-%"PRIu64,
+                  xl_id, child, count);
+
+        if (!end_time_str)
+                end_time_str = "Could not determine the end time";
+        ret = dict_set_dynstr (output, key, gf_strdup(end_time_str));
+         if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Could not add statistics_"
+                        "crawl_end_time to outout");
+                goto out;
+        }
+        snprintf (key, sizeof (key), "statistics_inprogress-%d-%d-%"PRIu64,
+                  xl_id, child, count);
+
+        if (shd_event->crawl_inprogress == _gf_true)
+                progress = 1;
+        else
+                progress = 0;
+
+        ret = dict_set_int32 (output, key, progress);
+         if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Could not add statistics_"
+                        "inprogress to outout");
+                goto out;
+        }
+
+         snprintf (key, sizeof (key), "statistics-%d-%d-count",xl_id, child);
+         ret = dict_set_uint64 (output, key, count + 1);
+         if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Could not increment the "
+                        "counter.");
+                goto out;
+         }
+out:
+        return ret;
+}
+
+int
 _add_path_to_dict (xlator_t *this, dict_t *output, int child, char *path,
                    struct timeval *tv, gf_boolean_t dyn)
 {
@@ -233,6 +378,20 @@ out:
 }
 
 int
+_add_crawl_event_statistics_to_dict (circular_buffer_t *cb, void *data)
+{
+        int               ret = 0;
+        shd_dump_t        *dump_data = NULL;
+        shd_crawl_event_t *shd_event = NULL;
+
+        dump_data = data;
+        shd_event = cb->data;
+        ret = _add_crawl_stats_to_dict (dump_data->this, dump_data->dict,
+                                        dump_data->child, shd_event, &cb->tv);
+        return ret;
+}
+
+int
 _add_eh_to_dict (xlator_t *this, eh_t *eh, dict_t *dict, int child)
 {
         shd_dump_t dump_data = {0};
@@ -244,6 +403,26 @@ _add_eh_to_dict (xlator_t *this, eh_t *eh, dict_t *dict, int child)
         return 0;
 }
 
+
+int
+_add_statistics_to_dict (xlator_t *this, dict_t *dict, int child)
+{
+        shd_dump_t              dump_data = {0};
+        afr_private_t           *priv  = NULL;
+        afr_self_heald_t        *shd = NULL;
+
+        priv = this->private;
+        shd = &priv->shd;
+
+        dump_data.this = this;
+        dump_data.dict = dict;
+        dump_data.child = child;
+        eh_dump (shd->statistics[child], &dump_data,
+                 _add_crawl_event_statistics_to_dict);
+        return 0;
+
+}
+
 void
 _remove_stale_index (xlator_t *this, xlator_t *readdir_xl,
                      loc_t *parent, char *fname)
@@ -269,6 +448,46 @@ out:
 }
 
 int
+_count_hard_links_under_base_indices_dir (xlator_t *this,
+                                           afr_crawl_data_t *crawl_data,
+                                           gf_dirent_t *entry, loc_t *childloc,
+                                           loc_t *parentloc, struct iatt *iattr)
+{
+        xlator_t                *readdir_xl = crawl_data->readdir_xl;
+        struct iatt             parent = {0};
+        int                     ret = 0;
+        dict_t                  *output = NULL;
+        int                     xl_id =  0;
+        char                    key[256] = {0};
+        int                     child  = -1;
+        uint64_t                     hardlinks = 0;
+
+        output = crawl_data->op_data;
+        child = crawl_data->child;
+
+        ret = syncop_lookup (readdir_xl, childloc, NULL, iattr, NULL, &parent);
+        if (ret)
+                goto out;
+
+        ret = dict_get_int32 (output, this->name, &xl_id);
+        if (ret)
+                goto out;
+
+        snprintf (key, sizeof (key), "%d-%d-hardlinks", xl_id, child);
+        ret =  dict_get_uint64 (output, key, &hardlinks);
+
+        /*Removing the count of base_entry under indices/base_indicies and
+         * entry under indices/xattrop */
+        hardlinks = hardlinks + iattr->ia_nlink - 2;
+        ret = dict_set_uint64 (output, key, hardlinks);
+        if (ret)
+                goto out;
+
+out:
+        return ret;
+}
+
+int
 _add_summary_to_dict (xlator_t *this, afr_crawl_data_t *crawl_data,
                       gf_dirent_t *entry,
                       loc_t *childloc, loc_t *parentloc, struct iatt *iattr)
@@ -307,16 +526,18 @@ _crawl_post_sh_action (xlator_t *this, loc_t *parent, loc_t *child,
                        int32_t op_ret, int32_t op_errno, dict_t *xattr_rsp,
                        afr_crawl_data_t *crawl_data)
 {
-        int              ret = 0;
-        afr_private_t    *priv = NULL;
-        afr_self_heald_t *shd = NULL;
-        eh_t             *eh = NULL;
-        char             *path = NULL;
-        char             gfid_str[64] = {0};
-        shd_event_t      *event = NULL;
-        int32_t          sh_failed = 0;
-        gf_boolean_t     split_brain = 0;
-        int32_t          actual_sh_done = 0;
+        int                ret = 0;
+        afr_private_t      *priv = NULL;
+        afr_self_heald_t   *shd = NULL;
+        eh_t               *eh = NULL;
+        char               *path = NULL;
+        char               gfid_str[64] = {0};
+        shd_event_t        *event = NULL;
+        int32_t            sh_failed = 0;
+        gf_boolean_t       split_brain = 0;
+        int32_t            actual_sh_done = 0;
+        shd_crawl_event_t  **shd_crawl_event = NULL;
+
         priv = this->private;
         shd  = &priv->shd;
         if (crawl_data->crawl == INDEX) {
@@ -343,16 +564,19 @@ _crawl_post_sh_action (xlator_t *this, loc_t *parent, loc_t *child,
                 ret = dict_get_int32 (xattr_rsp, "actual-sh-done", &actual_sh_done);
         }
 
-        split_brain = afr_is_split_brain (this, child->inode);
+        shd_crawl_event = (shd_crawl_event_t**)(shd->crawl_events);
 
+        split_brain = afr_is_split_brain (this, child->inode);
         if ((op_ret < 0 && op_errno == EIO) || split_brain) {
                 eh = shd->split_brain;
+                shd_crawl_event[crawl_data->child]->split_brain_count += 1;
         } else if ((op_ret < 0) || sh_failed) {
                 eh = shd->heal_failed;
+                shd_crawl_event[crawl_data->child]->heal_failed_count += 1;
         } else if (actual_sh_done == 1) {
-                      eh = shd->healed;
+                eh = shd->healed;
+                shd_crawl_event[crawl_data->child]->healed_count += 1;
         }
-
         ret = -1;
 
         if (eh != NULL) {
@@ -408,10 +632,20 @@ _self_heal_entry (xlator_t *this, afr_crawl_data_t *crawl_data, gf_dirent_t *ent
         struct iatt      parentbuf = {0};
         int              ret = 0;
         dict_t           *xattr_rsp = NULL;
+        dict_t           *xattr_req = NULL;
+
+        xattr_req = dict_new ();
+        if (!xattr_req) {
+                errno = ENOMEM;
+                ret = -1;
+                goto out;
+        }
+
+        ret = dict_set_int32 (xattr_req, "allow-sh-for-running-transaction", 1);
 
         gf_log (this->name, GF_LOG_DEBUG, "lookup %s", child->path);
 
-        ret = syncop_lookup (this, child, NULL,
+        ret = syncop_lookup (this, child, xattr_req,
                              iattr, &xattr_rsp, &parentbuf);
         _crawl_post_sh_action (this, parent, child, ret, errno, xattr_rsp,
                                crawl_data);
@@ -420,6 +654,9 @@ _self_heal_entry (xlator_t *this, afr_crawl_data_t *crawl_data, gf_dirent_t *ent
         if (ret == 0)
                 ret = _link_inode_update_loc (this, child, iattr);
 
+out:
+        if (xattr_req)
+                dict_unref(xattr_req);
         return ret;
 }
 
@@ -528,12 +765,20 @@ _do_crawl_op_on_local_subvols (xlator_t *this, afr_crawl_type_t crawl,
                                         status = "Started self-heal";
                                         _do_self_heal_on_subvol (this, i,
                                                                  crawl);
-                                } else if (output) {
+                                } else if (output && (op == INFO)) {
                                         status = "";
                                         afr_start_crawl (this, i, INDEX,
                                                          _add_summary_to_dict,
                                                          output, _gf_false, 0,
                                                          NULL);
+                                } else if (output &&
+                                           (op == STATISTICS_TO_BE_HEALED)) {
+                                            status = "";
+                                            afr_start_crawl (this, i,
+                                                             INDEX_TO_BE_HEALED,
+                                       _count_hard_links_under_base_indices_dir,
+                                                             output, _gf_false,
+                                                             0, NULL);
                                 }
                         }
                         if (output) {
@@ -567,8 +812,103 @@ _get_index_summary_on_local_subvols (xlator_t *this, dict_t *output)
         return _do_crawl_op_on_local_subvols (this, INDEX, INFO, output);
 }
 
+void
+afr_fill_completed_crawl_statistics_to_dict (xlator_t *this, dict_t *dict)
+{
+        afr_private_t           *priv  = NULL;
+        afr_self_heald_t        *shd = NULL;
+        int                     i = 0;
+        priv = this->private;
+        shd= &priv->shd;
+        for (i = 0; i < priv->child_count; i++) {
+                if (shd->pos[i] != AFR_POS_LOCAL)
+                        continue;
+                _add_statistics_to_dict (this, dict, i);
+        }
+
+        return ;
+}
+
+static void
+reset_crawl_event (shd_crawl_event_t *crawl_event)
+{
+    crawl_event->healed_count = 0;
+    crawl_event->split_brain_count = 0;
+    crawl_event->heal_failed_count = 0;
+    GF_FREE (crawl_event->start_time_str);
+    crawl_event->start_time_str = NULL;
+    crawl_event->end_time_str = NULL;
+    crawl_event->crawl_type = NULL;
+    crawl_event->crawl_inprogress = _gf_false;
+    return;
+}
+
+static void
+afr_copy_crawl_event_struct (shd_crawl_event_t *src, shd_crawl_event_t *dst)
+{
+        dst->healed_count = src->healed_count;
+        dst->split_brain_count = src->split_brain_count;
+        dst->heal_failed_count = src->heal_failed_count;
+        dst->start_time_str = gf_strdup (src->start_time_str);
+        dst->end_time_str = "Crawl is already in progress";
+        dst->crawl_type = src->crawl_type;
+        dst->crawl_inprogress = _gf_true;
+        return;
+}
+
+static int
+afr_fill_crawl_statistics_of_running_crawl(xlator_t *this, dict_t *dict)
+{
+        shd_crawl_event_t       *evnt = NULL;
+        int                     ret = 0;
+        afr_private_t           *priv = NULL;
+        afr_self_heald_t        *shd = NULL;
+        int                     i = 0;
+        priv = this->private;
+        shd = &priv->shd;
+
+        evnt = GF_CALLOC (1, sizeof (shd_crawl_event_t),
+                          gf_afr_mt_shd_crawl_event_t);
+        if (!evnt) {
+                ret = -1;
+                goto out;
+        }
+        LOCK (&priv->lock);
+        {
+                for (i = 0; i < priv->child_count; i++) {
+                        if (shd->pos[i] != AFR_POS_LOCAL)
+                                continue;
+
+                        reset_crawl_event (evnt);
+
+                        if (!shd->crawl_events[i]) {
+                                continue;
+                        }
+
+                        afr_copy_crawl_event_struct (shd->crawl_events[i],
+                                                     evnt);
+                        _add_crawl_stats_to_dict (this, dict, i, evnt, NULL);
+
+                }
+        }
+        UNLOCK (&priv->lock);
+        reset_crawl_event (evnt);
+        GF_FREE (evnt);
+
+out:
+        return ret;
+}
+
+static int
+_add_local_subvols_crawl_statistics_to_dict (xlator_t *this, dict_t *dict)
+{
+        int ret = 0;
+        afr_fill_completed_crawl_statistics_to_dict (this, dict);
+        ret = afr_fill_crawl_statistics_of_running_crawl (this, dict);
+        return ret;
+}
 int
-_add_all_subvols_eh_to_dict (xlator_t *this, eh_t *eh, dict_t *dict)
+_add_local_subvols_eh_to_dict (xlator_t *this, eh_t *eh, dict_t *dict)
 {
         afr_private_t           *priv = NULL;
         afr_self_heald_t        *shd = NULL;
@@ -618,16 +958,25 @@ afr_xl_op (xlator_t *this, dict_t *input, dict_t *output)
                 ret = 0;
                 break;
         case GF_AFR_OP_HEALED_FILES:
-                ret = _add_all_subvols_eh_to_dict (this, shd->healed, output);
+                ret = _add_local_subvols_eh_to_dict (this, shd->healed, output);
                 break;
         case GF_AFR_OP_HEAL_FAILED_FILES:
-                ret = _add_all_subvols_eh_to_dict (this, shd->heal_failed,
+                ret = _add_local_subvols_eh_to_dict (this, shd->heal_failed,
                                                    output);
                 break;
         case GF_AFR_OP_SPLIT_BRAIN_FILES:
-                ret = _add_all_subvols_eh_to_dict (this, shd->split_brain,
+                ret = _add_local_subvols_eh_to_dict (this, shd->split_brain,
                                                    output);
                 break;
+        case GF_AFR_OP_STATISTICS:
+                ret = _add_local_subvols_crawl_statistics_to_dict (this, output);
+                break;
+        case GF_AFR_OP_STATISTICS_HEAL_COUNT:
+        case GF_AFR_OP_STATISTICS_HEAL_COUNT_PER_REPLICA:
+                ret = _do_crawl_op_on_local_subvols (this, INDEX_TO_BE_HEALED,
+                                                     STATISTICS_TO_BE_HEALED,
+                                                     output);
+                break;
         default:
                 gf_log (this->name, GF_LOG_ERROR, "Unknown set op %d", op);
                 break;
@@ -642,7 +991,7 @@ afr_poll_self_heal (void *data)
 {
         afr_private_t    *priv = NULL;
         afr_self_heald_t *shd = NULL;
-        struct timeval   timeout = {0};
+        struct timespec  timeout = {0};
         xlator_t         *this = NULL;
         long             child = (long)data;
         gf_timer_t       *old_timer = NULL;
@@ -666,7 +1015,7 @@ afr_poll_self_heal (void *data)
         if (shd->enabled && (shd->pos[child] == AFR_POS_LOCAL))
                 _do_self_heal_on_subvol (this, child, INDEX);
         timeout.tv_sec = shd->timeout;
-        timeout.tv_usec = 0;
+        timeout.tv_nsec = 0;
         //notify and previous timer should be synchronized.
         LOCK (&priv->lock);
         {
@@ -800,6 +1149,7 @@ afr_crawl_build_start_loc (xlator_t *this, afr_crawl_data_t *crawl_data,
         afr_private_t *priv = NULL;
         dict_t        *xattr = NULL;
         void          *index_gfid = NULL;
+        void          *base_indices_holder_vgfid = NULL;
         loc_t         rootloc = {0};
         struct iatt   iattr = {0};
         struct iatt   parent = {0};
@@ -809,7 +1159,7 @@ afr_crawl_build_start_loc (xlator_t *this, afr_crawl_data_t *crawl_data,
         priv = this->private;
         if (crawl_data->crawl == FULL) {
                 afr_build_root_loc (this, dirloc);
-        } else {
+        } else if (crawl_data->crawl == INDEX) {
                 afr_build_root_loc (this, &rootloc);
                 ret = syncop_getxattr (readdir_xl, &rootloc, &xattr,
                                        GF_XATTROP_INDEX_GFID);
@@ -843,6 +1193,47 @@ afr_crawl_build_start_loc (xlator_t *this, afr_crawl_data_t *crawl_data,
                 ret = _link_inode_update_loc (this, dirloc, &iattr);
                 if (ret)
                         goto out;
+        } else if (crawl_data->crawl == INDEX_TO_BE_HEALED) {
+                afr_build_root_loc (this, &rootloc);
+                ret = syncop_getxattr (readdir_xl, &rootloc, &xattr,
+                                       GF_BASE_INDICES_HOLDER_GFID);
+                if (ret < 0)
+                        goto out;
+                ret = dict_get_ptr (xattr, GF_BASE_INDICES_HOLDER_GFID,
+                                    &base_indices_holder_vgfid);
+                if (ret < 0) {
+                        gf_log (this->name, GF_LOG_ERROR, "index gfid empty "
+                                "on %s", readdir_xl->name);
+                        ret = -1;
+                        goto out;
+                }
+                if (!base_indices_holder_vgfid) {
+                        gf_log (this->name, GF_LOG_ERROR, "Base indices holder"
+                                "virtual gfid is null on %s", readdir_xl->name);
+                        ret = -1;
+                        goto out;
+                }
+                uuid_copy (dirloc->gfid,  base_indices_holder_vgfid);
+                dirloc->path = "";
+                dirloc->inode = inode_new (priv->root_inode->table);
+                ret = syncop_lookup (readdir_xl, dirloc, NULL, &iattr, NULL,
+                                     &parent);
+                if (ret < 0) {
+                        if (errno != ENOENT) {
+                                gf_log (this->name, GF_LOG_ERROR, "lookup "
+                                        "failed for base_indices_holder dir"
+                                        " on %s - (%s)", readdir_xl->name,
+                                        strerror (errno));
+
+                        } else {
+                                gf_log (this->name, GF_LOG_ERROR, "base_indices"
+                                        "_holder is not yet created.");
+                        }
+                        goto out;
+                }
+                ret = _link_inode_update_loc (this, dirloc, &iattr);
+                if (ret)
+                        goto out;
         }
         ret = 0;
 out:
@@ -907,6 +1298,16 @@ afr_crawl_build_child_loc (xlator_t *this, loc_t *child, loc_t *parent,
         priv = this->private;
         if (crawl_data->crawl == FULL) {
                 ret = afr_build_child_loc (this, child, parent, entry->d_name);
+        } else if (crawl_data->crawl == INDEX_TO_BE_HEALED) {
+                ret = _build_index_loc (this, child, entry->d_name, parent);
+                if (ret)
+                        goto out;
+                child->inode = inode_new (priv->root_inode->table);
+                if (!child->inode) {
+                        ret = -1;
+                        goto out;
+                }
+                child->path = NULL;
         } else {
                 child->inode = inode_new (priv->root_inode->table);
                 if (!child->inode)
@@ -956,10 +1357,14 @@ _process_entries (xlator_t *this, loc_t *parentloc, gf_dirent_t *entries,
                 ret = crawl_data->process_entry (this, crawl_data, entry,
                                                  &entry_loc, parentloc, &iattr);
 
-                if (ret)
+                if (crawl_data->crawl == INDEX_TO_BE_HEALED && ret) {
+                       goto out;
+                } else if (ret) {
                         continue;
+                }
 
-                if (crawl_data->crawl == INDEX)
+                if ((crawl_data->crawl == INDEX) ||
+                    (crawl_data->crawl == INDEX_TO_BE_HEALED))
                         continue;
 
                 if (!IA_ISDIR (iattr.ia_type))
@@ -974,6 +1379,10 @@ _process_entries (xlator_t *this, loc_t *parentloc, gf_dirent_t *entries,
         }
         ret = 0;
 out:
+        if ((crawl_data->crawl == INDEX_TO_BE_HEALED)  && ret) {
+                gf_log (this->name, GF_LOG_ERROR,"Failed to get the hardlink "
+                        "count");
+        }
         loc_wipe (&entry_loc);
         return ret;
 }
@@ -1021,6 +1430,9 @@ _crawl_directory (fd_t *fd, loc_t *loc, afr_crawl_data_t *crawl_data)
 
                 ret = _process_entries (this, loc, &entries, &offset,
                                         crawl_data);
+                if ((ret < 0) && (crawl_data->crawl == INDEX_TO_BE_HEALED)) {
+                        goto out;
+                }
                 gf_dirent_free (&entries);
                 free_entries = _gf_false;
         }
@@ -1126,8 +1538,13 @@ afr_dir_crawl (void *data)
                 goto out;
 
         ret = afr_crawl_opendir (this, crawl_data, &fd, &dirloc);
-        if (ret)
+        if (ret) {
+                if (crawl_data->crawl == INDEX_TO_BE_HEALED) {
+                        gf_log (this->name, GF_LOG_ERROR, "Failed to open base_"
+                                "indices_holder");
+                }
                 goto out;
+        }
 
         ret = _crawl_directory (fd, &dirloc, crawl_data);
         if (ret)
@@ -1141,12 +1558,102 @@ afr_dir_crawl (void *data)
 out:
         if (fd)
                 fd_unref (fd);
-        if (crawl_data->crawl == INDEX)
+        if ((crawl_data->crawl == INDEX) ||
+            (crawl_data->crawl == INDEX_TO_BE_HEALED ))
                 dirloc.path = NULL;
         loc_wipe (&dirloc);
         return ret;
 }
 
+char *
+get_crawl_type_in_string (afr_crawl_type_t crawl)
+{
+        char    *index = "INDEX";
+        char    *full  = "FULL";
+        char    *crawl_type = NULL;
+
+        if (crawl == INDEX){
+                crawl_type = index;
+        } else if (crawl == FULL) {
+                crawl_type = full;
+        }
+
+        return  crawl_type;
+}
+
+static int
+afr_allocate_crawl_event (xlator_t *this, int child, afr_crawl_type_t crawl)
+{
+        afr_private_t           *priv = NULL;
+        afr_self_heald_t        *shd = NULL;
+        int                     ret = 0;
+        shd_crawl_event_t       *crawl_event = NULL;
+        time_t                  get_time = 0;
+
+        priv = this->private;
+        shd = &priv->shd;
+
+        crawl_event = GF_CALLOC (sizeof (shd_crawl_event_t), 1,
+                                 gf_afr_mt_shd_crawl_event_t);
+        if (!crawl_event) {
+                ret = -1;
+                goto out;
+        }
+
+        get_time =  time(NULL);
+        if (get_time == ((time_t)-1)) {
+                 ret = -1;
+                goto out;
+        }
+
+        crawl_event->start_time_str = gf_strdup (ctime(&get_time));
+
+        crawl_event->crawl_type = get_crawl_type_in_string (crawl);
+        if (!crawl_event->crawl_type) {
+                ret = -1;
+                goto out;
+        }
+        LOCK (&priv->lock);
+        {
+                shd->crawl_events[child] = crawl_event;
+        }
+        UNLOCK (&priv->lock);
+        ret = 0;
+out:
+        return ret;
+
+}
+
+static int
+afr_put_crawl_event_in_eh (xlator_t *this, int child)
+{
+        afr_private_t           *priv = NULL;
+        afr_self_heald_t        *shd = NULL;
+        int                     ret = 0;
+        time_t                  get_time = 0;
+        shd_crawl_event_t       **crawl_event = NULL;
+
+        priv = this->private;
+        shd = &priv->shd;
+
+        get_time = time(NULL);
+        if (get_time == ((time_t)-1)) {
+                ret = -1;
+                goto out;
+        }
+        crawl_event = (shd_crawl_event_t**)shd->crawl_events;
+        LOCK (&priv->lock);
+        {
+                crawl_event[child]->end_time_str = gf_strdup (ctime(&get_time));
+                ret = eh_save_history (shd->statistics[child],
+                                       crawl_event[child]);
+                crawl_event[child] = NULL;
+        }
+        UNLOCK (&priv->lock);
+out:
+        return ret;
+}
+
 static int
 afr_dir_exclusive_crawl (void *data)
 {
@@ -1182,7 +1689,15 @@ afr_dir_exclusive_crawl (void *data)
         }
 
         do {
+                ret = afr_allocate_crawl_event (this, child, crawl_data->crawl);
+                if (ret)
+                        goto out;
                 afr_dir_crawl (data);
+
+                ret = afr_put_crawl_event_in_eh (this, child);
+                if (ret < 0)
+                        goto out;
+
                 LOCK (&priv->lock);
                 {
                         if (shd->pending[child] != NONE) {
@@ -1239,8 +1754,8 @@ afr_start_crawl (xlator_t *this, int idx, afr_crawl_type_t crawl,
         ret = synctask_new (this->ctx->env, crawler,
                             crawl_done, frame, crawl_data);
         if (ret)
-                gf_log (this->name, GF_LOG_ERROR, "Could not create the "
-                        "task for %d ret %d", idx, ret);
+                gf_log (this->name, GF_LOG_ERROR, "afr crawl failed for child"
+                        " %d with ret %d", idx, ret);
 out:
         return;
 }
@@ -1270,4 +1785,3 @@ afr_set_root_gfid (dict_t *dict)
 
         return ret;
 }
-
diff --git a/xlators/cluster/afr/src/afr-self-heald.h b/xlators/cluster/afr/src/afr-self-heald.h
index 32a8aaca5..e0c083754 100644
--- a/xlators/cluster/afr/src/afr-self-heald.h
+++ b/xlators/cluster/afr/src/afr-self-heald.h
@@ -29,6 +29,19 @@ typedef struct afr_crawl_data_ {
                               struct iatt *iattr);
 } afr_crawl_data_t;
 
+typedef struct crawl_event_stats_ {
+        uint64_t healed_count;
+        uint64_t split_brain_count;
+        uint64_t heal_failed_count;
+        char     *start_time_str;
+        char     *end_time_str;
+        char     *crawl_type;
+        gf_boolean_t crawl_inprogress;
+} shd_crawl_event_t;
+
+void _destroy_crawl_event_data (void *data);
+void _destroy_shd_event_data (void *data);
+
 typedef int (*process_entry_cbk_t) (xlator_t *this, afr_crawl_data_t *crawl_data,
                               gf_dirent_t *entry, loc_t *child, loc_t *parent,
                               struct iatt *iattr);
diff --git a/xlators/cluster/afr/src/afr-transaction.c b/xlators/cluster/afr/src/afr-transaction.c
index d20928d15..20306e469 100644
--- a/xlators/cluster/afr/src/afr-transaction.c
+++ b/xlators/cluster/afr/src/afr-transaction.c
@@ -79,7 +79,7 @@ afr_save_lk_owner (call_frame_t *frame)
 
         local = frame->local;
 
-	local->saved_lk_owner = frame->root->lk_owner;
+        local->saved_lk_owner = frame->root->lk_owner;
 }
 
 
@@ -90,10 +90,9 @@ afr_restore_lk_owner (call_frame_t *frame)
 
         local = frame->local;
 
-	frame->root->lk_owner = local->saved_lk_owner;
+        frame->root->lk_owner = local->saved_lk_owner;
 }
 
-
 static void
 __mark_all_pending (int32_t *pending[], int child_count,
                     afr_transaction_type type)
@@ -146,36 +145,6 @@ out:
         return;
 }
 
-
-static void
-__mark_pre_op_undone_on_fd (call_frame_t *frame, xlator_t *this, int child_index)
-{
-        afr_local_t   *local = NULL;
-        afr_fd_ctx_t  *fd_ctx = NULL;
-
-        local = frame->local;
-
-        if (!local->fd)
-                return;
-
-        fd_ctx = afr_fd_ctx_get (local->fd, this);
-
-        if (!fd_ctx)
-                goto out;
-
-        LOCK (&local->fd->lock);
-        {
-                if (local->transaction.type == AFR_DATA_TRANSACTION) {
-                        GF_ASSERT (fd_ctx->pre_op_done[child_index]);
-                        fd_ctx->pre_op_done[child_index]--;
-                }
-        }
-        UNLOCK (&local->fd->lock);
-out:
-        return;
-}
-
-
 static void
 __mark_non_participant_children (int32_t *pending[], int child_count,
                                  unsigned char *participants,
@@ -192,7 +161,7 @@ __mark_non_participant_children (int32_t *pending[], int child_count,
 }
 
 
-static void
+void
 __mark_all_success (int32_t *pending[], int child_count,
                     afr_transaction_type type)
 {
@@ -398,6 +367,11 @@ afr_changelog_post_op_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
         UNLOCK (&frame->lock);
 
         if (call_count == 0) {
+                if (local->transaction.resume_stub) {
+			call_resume (local->transaction.resume_stub);
+                        local->transaction.resume_stub = NULL;
+                }
+
                 if (afr_lock_server_count (priv, local->transaction.type) == 0) {
                         local->transaction.done (frame, this);
                 } else {
@@ -468,14 +442,30 @@ out:
         return;
 }
 
+afr_inodelk_t*
+afr_get_inodelk (afr_internal_lock_t *int_lock, char *dom)
+{
+        afr_inodelk_t *inodelk = NULL;
+        int           i = 0;
+
+        for (i = 0; int_lock->inodelk[i].domain; i++) {
+                inodelk = &int_lock->inodelk[i];
+                if (strcmp (dom, inodelk->domain) == 0)
+                        return inodelk;
+        }
+        return NULL;
+}
+
 unsigned char*
 afr_locked_nodes_get (afr_transaction_type type, afr_internal_lock_t *int_lock)
 {
         unsigned char *locked_nodes = NULL;
+        afr_inodelk_t *inodelk = NULL;
         switch (type) {
         case AFR_DATA_TRANSACTION:
         case AFR_METADATA_TRANSACTION:
-                locked_nodes = int_lock->inode_locked_nodes;
+                inodelk = afr_get_inodelk (int_lock, int_lock->domain);
+                locked_nodes = inodelk->locked_nodes;
         break;
 
         case AFR_ENTRY_TRANSACTION:
@@ -574,6 +564,82 @@ afr_set_postop_dict (afr_local_t *local, xlator_t *this, dict_t *xattr,
                         "failed to set pending entry");
 }
 
+
+gf_boolean_t
+afr_txn_nothing_failed (call_frame_t *frame, xlator_t *this)
+{
+        afr_private_t *priv = NULL;
+        afr_local_t *local = NULL;
+        int index = -1;
+        int i = 0;
+
+        local = frame->local;
+        priv = this->private;
+
+        index = afr_index_for_transaction_type (local->transaction.type);
+
+        for (i = 0; i < priv->child_count; i++) {
+                if (local->pending[i][index] == 0)
+                        return _gf_false;
+        }
+
+        return _gf_true;
+}
+
+static void
+afr_dir_fop_handle_all_fop_failures (call_frame_t *frame)
+{
+        xlator_t        *this = NULL;
+        afr_local_t     *local = NULL;
+        afr_private_t   *priv = NULL;
+
+        this = frame->this;
+        local = frame->local;
+        priv = this->private;
+
+        if ((local->transaction.type != AFR_ENTRY_TRANSACTION) &&
+            (local->transaction.type != AFR_ENTRY_RENAME_TRANSACTION))
+                return;
+
+        if (local->op_ret >= 0)
+                goto out;
+
+        __mark_all_success (local->pending, priv->child_count,
+                            local->transaction.type);
+out:
+        return;
+}
+
+static void
+afr_data_handle_quota_errors (call_frame_t *frame, xlator_t *this)
+{
+        int     i = 0;
+        afr_private_t *priv = NULL;
+        afr_local_t   *local = NULL;
+        gf_boolean_t  all_quota_failures = _gf_false;
+
+        local = frame->local;
+        priv  = this->private;
+        if (local->transaction.type != AFR_DATA_TRANSACTION)
+                return;
+        /*
+         * Idea is to not leave the file in FOOL-FOOL scenario in case on
+         * all the bricks data transaction failed with EDQUOT to avoid
+         * increasing un-necessary load of self-heals in the system.
+         */
+        all_quota_failures = _gf_true;
+        for (i = 0; i < priv->child_count; i++) {
+                if (local->transaction.pre_op[i] &&
+                    (local->child_errno[i] != EDQUOT)) {
+                        all_quota_failures = _gf_false;
+                        break;
+                }
+        }
+        if (all_quota_failures)
+                __mark_all_success (local->pending, priv->child_count,
+                                    local->transaction.type);
+}
+
 int
 afr_changelog_post_op_now (call_frame_t *frame, xlator_t *this)
 {
@@ -586,7 +652,6 @@ afr_changelog_post_op_now (call_frame_t *frame, xlator_t *this)
         afr_fd_ctx_t  *fdctx = NULL;
         dict_t        **xattr = NULL;
         int            piggyback = 0;
-        int            index = 0;
         int            nothing_failed = 1;
 
         local    = frame->local;
@@ -596,6 +661,9 @@ afr_changelog_post_op_now (call_frame_t *frame, xlator_t *this)
                                          local->transaction.pre_op,
                                          local->transaction.type);
 
+        afr_data_handle_quota_errors (frame, this);
+        afr_dir_fop_handle_all_fop_failures (frame);
+
         if (local->fd)
                 afr_transaction_rm_stale_children (frame, this,
                                                    local->fd->inode,
@@ -622,15 +690,7 @@ afr_changelog_post_op_now (call_frame_t *frame, xlator_t *this)
                 goto out;
         }
 
-        /* check if something has failed, to handle piggybacking */
-        nothing_failed = 1;
-        index = afr_index_for_transaction_type (local->transaction.type);
-        for (i = 0; i < priv->child_count; i++) {
-                if (local->pending[i][index] == 0) {
-                        nothing_failed = 0;
-                        break;
-                }
-        }
+        nothing_failed = afr_txn_nothing_failed (frame, this);
 
         afr_compute_txn_changelog (local , priv);
 
@@ -656,15 +716,14 @@ afr_changelog_post_op_now (call_frame_t *frame, xlator_t *this)
                                 break;
                         }
 
-                        LOCK (&local->fd->lock);
-                        {
-                                piggyback = 0;
-                                if (fdctx->pre_op_piggyback[i]) {
-                                        fdctx->pre_op_piggyback[i]--;
-                                        piggyback = 1;
-                                }
-                        }
-                        UNLOCK (&local->fd->lock);
+                        /* local->transaction.postop_piggybacked[] was
+                           precomputed in is_piggyback_postop() when called from
+                           afr_changelog_post_op_safe()
+                        */
+
+                        piggyback = 0;
+                        if (local->transaction.postop_piggybacked[i])
+                                piggyback = 1;
 
                         afr_set_postop_dict (local, this, xattr[i],
                                              piggyback, i);
@@ -673,9 +732,6 @@ afr_changelog_post_op_now (call_frame_t *frame, xlator_t *this)
                                 afr_changelog_post_op_cbk (frame, (void *)(long)i,
                                                            this, 1, 0, xattr[i], NULL);
                         } else {
-                                if (!piggyback)
-                                        __mark_pre_op_undone_on_fd (frame, this,
-                                                                    i);
                                 STACK_WIND_COOKIE (frame,
                                                    afr_changelog_post_op_cbk,
                                                    (void *) (long) i,
@@ -921,7 +977,7 @@ afr_changelog_pre_op (call_frame_t *frame, xlator_t *this)
                         }
                         UNLOCK (&local->fd->lock);
 
-			afr_set_delayed_post_op (frame, this);
+                        afr_set_delayed_post_op (frame, this);
 
                         if (piggyback)
                                 afr_changelog_pre_op_cbk (frame, (void *)(long)i,
@@ -1194,12 +1250,14 @@ int
 afr_set_transaction_flock (afr_local_t *local)
 {
         afr_internal_lock_t *int_lock = NULL;
+        afr_inodelk_t       *inodelk  = NULL;
 
         int_lock = &local->internal_lock;
+        inodelk = afr_get_inodelk (int_lock, int_lock->domain);
 
-        int_lock->lk_flock.l_len   = local->transaction.len;
-        int_lock->lk_flock.l_start = local->transaction.start;
-        int_lock->lk_flock.l_type  = F_WRLCK;
+        inodelk->flock.l_len   = local->transaction.len;
+        inodelk->flock.l_start = local->transaction.start;
+        inodelk->flock.l_type  = F_WRLCK;
 
         return 0;
 }
@@ -1214,6 +1272,7 @@ afr_lock_rec (call_frame_t *frame, xlator_t *this)
         int_lock = &local->internal_lock;
 
         int_lock->transaction_lk_type = AFR_TRANSACTION_LK;
+        int_lock->domain = this->name;
 
         switch (local->transaction.type) {
         case AFR_DATA_TRANSACTION:
@@ -1274,87 +1333,384 @@ afr_internal_lock_finish (call_frame_t *frame, xlator_t *this)
 void
 afr_set_delayed_post_op (call_frame_t *frame, xlator_t *this)
 {
-	afr_local_t    *local = NULL;
-	afr_private_t  *priv = NULL;
+        afr_local_t    *local = NULL;
+        afr_private_t  *priv = NULL;
 
-	/* call this function from any of the related optimizations
-	   which benefit from delaying post op are enabled, namely:
+        /* call this function from any of the related optimizations
+           which benefit from delaying post op are enabled, namely:
 
-	   - changelog piggybacking
-	   - eager locking
-	*/
+           - changelog piggybacking
+           - eager locking
+        */
 
-	priv = this->private;
-	if (!priv)
-		return;
+        priv = this->private;
+        if (!priv)
+                return;
 
-	if (!priv->post_op_delay_secs)
-		return;
+        if (!priv->post_op_delay_secs)
+                return;
 
         local = frame->local;
         if (!local->transaction.eager_lock_on)
                 return;
 
-	if (!local)
-		return;
+        if (!local)
+                return;
 
-	if (!local->fd)
-		return;
+        if (!local->fd)
+                return;
 
-	if (local->op == GF_FOP_WRITE)
-		local->delayed_post_op = _gf_true;
+        if (local->op == GF_FOP_WRITE)
+                local->delayed_post_op = _gf_true;
 }
 
+gf_boolean_t
+afr_are_multiple_fds_opened (inode_t *inode, xlator_t *this)
+{
+        afr_inode_ctx_t *ictx = NULL;
+
+        if (!inode) {
+                /* If false is returned, it may keep on taking eager-lock
+                 * which may lead to starvation, so return true to avoid that.
+                 */
+                gf_log_callingfn (this->name, GF_LOG_ERROR, "Invalid inode");
+                return _gf_true;
+        }
+        /* Lets say mount1 has eager-lock(full-lock) and after the eager-lock
+         * is taken mount2 opened the same file, it won't be able to
+         * perform any data operations until mount1 releases eager-lock.
+         * To avoid such scenario do not enable eager-lock for this transaction
+         * if open-fd-count is > 1
+         */
+
+        ictx = afr_inode_ctx_get (inode, this);
+        if (!ictx)
+                return _gf_true;
+
+        if (ictx->open_fd_count > 1)
+                return _gf_true;
+
+        return _gf_false;
+}
+
+gf_boolean_t
+afr_any_fops_failed (afr_local_t *local, afr_private_t *priv)
+{
+        if (local->success_count != priv->child_count)
+                return _gf_true;
+        return _gf_false;
+}
 
 gf_boolean_t
 is_afr_delayed_changelog_post_op_needed (call_frame_t *frame, xlator_t *this)
 {
-	afr_local_t      *local = NULL;
-	gf_boolean_t      res = _gf_false;
+        afr_local_t      *local = NULL;
+        gf_boolean_t      res = _gf_false;
+        afr_private_t    *priv  = NULL;
 
-	local = frame->local;
-	if (!local)
-		goto out;
+        priv  = this->private;
 
-	if (!local->delayed_post_op)
-		goto out;
+        local = frame->local;
+        if (!local)
+                goto out;
 
-	res = _gf_true;
+        if (!local->delayed_post_op)
+                goto out;
+
+        //Mark pending changelog ASAP
+        if (afr_any_fops_failed (local, priv))
+                goto out;
+
+        if (local->fd && afr_are_multiple_fds_opened (local->fd->inode, this))
+                goto out;
+
+        res = _gf_true;
 out:
-	return res;
+        return res;
 }
 
 
 void
-afr_delayed_changelog_post_op (xlator_t *this, call_frame_t *frame, fd_t *fd);
+afr_delayed_changelog_post_op (xlator_t *this, call_frame_t *frame, fd_t *fd,
+                               call_stub_t *stub);
 
 void
 afr_delayed_changelog_wake_up_cbk (void *data)
 {
-	fd_t           *fd = NULL;
+        fd_t           *fd = NULL;
+
+        fd = data;
+
+        afr_delayed_changelog_wake_up (THIS, fd);
+}
+
+
+/*
+  Check if the frame is destined to get optimized away
+  with changelog piggybacking
+*/
+static gf_boolean_t
+is_piggyback_post_op (call_frame_t *frame, fd_t *fd)
+{
+        afr_fd_ctx_t *fdctx = NULL;
+        afr_local_t *local = NULL;
+        gf_boolean_t piggyback = _gf_true;
+        afr_private_t *priv = NULL;
+        int i = 0;
+
+        priv = frame->this->private;
+        local = frame->local;
+        fdctx = afr_fd_ctx_get (fd, frame->this);
+
+        LOCK(&fd->lock);
+        {
+                piggyback = _gf_true;
+
+                for (i = 0; i < priv->child_count; i++) {
+                        if (!local->transaction.pre_op[i])
+                                continue;
+                        if (fdctx->pre_op_piggyback[i]) {
+                                fdctx->pre_op_piggyback[i]--;
+                                local->transaction.postop_piggybacked[i] = 1;
+                        } else {
+                                /* For at least _one_ subvolume we cannot
+                                   piggyback on the changelog, and have to
+                                   perform a hard POST-OP and therefore fsync
+                                   if necesssary
+                                */
+                                piggyback = _gf_false;
+                                GF_ASSERT (fdctx->pre_op_done[i]);
+                                fdctx->pre_op_done[i]--;
+                        }
+                }
+        }
+        UNLOCK(&fd->lock);
+
+        if (!afr_txn_nothing_failed (frame, frame->this)) {
+                /* something failed in this transaction,
+                   we will be performing a hard post-op
+                */
+                return _gf_false;
+        }
+
+        return piggyback;
+}
+
+
+/* SET operation */
+int
+afr_fd_report_unstable_write (xlator_t *this, fd_t *fd)
+{
+        afr_fd_ctx_t *fdctx = NULL;
+
+        fdctx = afr_fd_ctx_get (fd, this);
+
+        LOCK(&fd->lock);
+        {
+                fdctx->witnessed_unstable_write = _gf_true;
+        }
+        UNLOCK(&fd->lock);
+
+        return 0;
+}
+
+/* TEST and CLEAR operation */
+gf_boolean_t
+afr_fd_has_witnessed_unstable_write (xlator_t *this, fd_t *fd)
+{
+        afr_fd_ctx_t *fdctx = NULL;
+        gf_boolean_t witness = _gf_false;
+
+	fdctx = afr_fd_ctx_get (fd, this);
+        if (!fdctx)
+                return _gf_true;
+
+        LOCK(&fd->lock);
+        {
+                if (fdctx->witnessed_unstable_write) {
+                        witness = _gf_true;
+                        fdctx->witnessed_unstable_write = _gf_false;
+                }
+        }
+        UNLOCK (&fd->lock);
+
+        return witness;
+}
+
+
+int
+afr_changelog_fsync_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                         int op_ret, int op_errno, struct iatt *pre,
+                         struct iatt *post, dict_t *xdata)
+{
+        afr_private_t *priv = NULL;
+        int child_index = (long) cookie;
+        int call_count = -1;
+        afr_local_t *local = NULL;
+
+        priv = this->private;
+        local = frame->local;
+
+        if (afr_fop_failed (op_ret, op_errno)) {
+                /* Failure of fsync() is as good as failure of previous
+                   write(). So treat it like one.
+                */
+                gf_log (this->name, GF_LOG_WARNING,
+                        "fsync(%s) failed on subvolume %s. Transaction was %s",
+                        uuid_utoa (local->fd->inode->gfid),
+                        priv->children[child_index]->name,
+                        gf_fop_list[local->op]);
+
+                afr_transaction_fop_failed (frame, this, child_index);
+        }
+
+        call_count = afr_frame_return (frame);
+
+        if (call_count == 0)
+                afr_changelog_post_op_now (frame, this);
+
+        return 0;
+}
+
+
+int
+afr_changelog_fsync (call_frame_t *frame, xlator_t *this)
+{
+        afr_local_t *local = NULL;
+        int i = 0;
+        int call_count = 0;
+        afr_private_t *priv = NULL;
+ 	dict_t *xdata = NULL;
+ 	GF_UNUSED int ret = -1;
 
-	fd = data;
+        local = frame->local;
+        priv = this->private;
 
-	afr_delayed_changelog_wake_up (THIS, fd);
+        call_count = afr_pre_op_done_children_count (local->transaction.pre_op,
+                                                     priv->child_count);
+
+        if (!call_count) {
+                /* will go straight to unlock */
+                afr_changelog_post_op_now (frame, this);
+                return 0;
+        }
+
+        local->call_count = call_count;
+
+	xdata = dict_new();
+	if (xdata)
+		ret = dict_set_int32 (xdata, "batch-fsync", 1);
+
+        for (i = 0; i < priv->child_count; i++) {
+                if (!local->transaction.pre_op[i])
+                        continue;
+
+                STACK_WIND_COOKIE (frame, afr_changelog_fsync_cbk,
+                                (void *) (long) i, priv->children[i],
+                                priv->children[i]->fops->fsync, local->fd,
+                                1, xdata);
+                if (!--call_count)
+                        break;
+        }
+
+	if (xdata)
+		dict_unref (xdata);
+
+        return 0;
+}
+
+
+        int
+afr_changelog_post_op_safe (call_frame_t *frame, xlator_t *this)
+{
+	afr_local_t    *local = NULL;
+        afr_private_t  *priv = NULL;
+
+	local = frame->local;
+        priv = this->private;
+
+        if (!local->fd || local->transaction.type != AFR_DATA_TRANSACTION) {
+                afr_changelog_post_op_now (frame, this);
+                return 0;
+        }
+
+        if (is_piggyback_post_op (frame, local->fd)) {
+                /* just detected that this post-op is about to
+                   be optimized away as a new write() has
+                   already piggybacked on this frame's changelog.
+                   */
+                afr_changelog_post_op_now (frame, this);
+                return 0;
+        }
+
+        /* Calling afr_changelog_post_op_now() now will result in
+           issuing ->[f]xattrop().
+
+           Performing a hard POST-OP (->[f]xattrop() FOP) is a more
+           responsible operation that what it might appear on the surface.
+
+           The changelog of a file (in the xattr of the file on the server)
+           stores information (pending count) about the state of the file
+           on the OTHER server. This changelog is blindly trusted, and must
+           therefore be updated in such a way it remains trustworthy. This
+           implies that decrementing the pending count (essentially "clearing
+           the dirty flag") must be done STRICTLY after we are sure that the
+           operation on the other server has reached stable storage.
+
+           While the backend filesystem on that server will eventually flush
+           it to stable storage, we (being in userspace) have no mechanism
+           to get notified when the write became "stable".
+
+           This means we need take matter into our own hands and issue an
+           fsync() EVEN IF THE APPLICATION WAS PERFORMING UNSTABLE WRITES,
+           and get an acknowledgement for it. And we need to wait for the
+           fsync() acknowledgement before initiating the hard POST-OP.
+
+           However if the FD itself was opened in O_SYNC or O_DSYNC then
+           we are already guaranteed that the writes were made stable as
+           part of the FOP itself. The same holds true for NFS stable
+           writes which happen on an anonymous FD with O_DSYNC or O_SYNC
+           flag set in the writev() @flags param. For all other write types,
+           mark a flag in the fdctx whenever an unstable write is witnessed.
+           */
+
+        if (!afr_fd_has_witnessed_unstable_write (this, local->fd)) {
+                afr_changelog_post_op_now (frame, this);
+                return 0;
+        }
+
+        /* Check whether users want durability and perform fsync/post-op
+         * accordingly.
+         */
+        if (priv->ensure_durability) {
+                /* Time to fsync() */
+                afr_changelog_fsync (frame, this);
+        } else {
+                afr_changelog_post_op_now (frame, this);
+        }
+
+        return 0;
 }
 
 
 void
-afr_delayed_changelog_post_op (xlator_t *this, call_frame_t *frame, fd_t *fd)
+afr_delayed_changelog_post_op (xlator_t *this, call_frame_t *frame, fd_t *fd,
+                               call_stub_t *stub)
 {
 	afr_fd_ctx_t      *fd_ctx = NULL;
 	call_frame_t      *prev_frame = NULL;
-	struct timeval     delta = {0, };
+	struct timespec    delta = {0, };
 	afr_private_t     *priv = NULL;
+	afr_local_t       *local = NULL;
 
 	priv = this->private;
 
 	fd_ctx = afr_fd_ctx_get (fd, this);
 	if (!fd_ctx)
-		return;
+                goto out;
 
 	delta.tv_sec = priv->post_op_delay_secs;
-	delta.tv_usec = 0;
+	delta.tv_nsec = 0;
 
 	pthread_mutex_lock (&fd_ctx->delay_lock);
 	{
@@ -1373,8 +1729,13 @@ afr_delayed_changelog_post_op (xlator_t *this, call_frame_t *frame, fd_t *fd)
 unlock:
 	pthread_mutex_unlock (&fd_ctx->delay_lock);
 
+out:
 	if (prev_frame) {
-		afr_changelog_post_op_now (prev_frame, this);
+		local = prev_frame->local;
+		local->transaction.resume_stub = stub;
+		afr_changelog_post_op_safe (prev_frame, this);
+	} else if (stub) {
+		call_resume (stub);
 	}
 }
 
@@ -1382,25 +1743,40 @@ unlock:
 void
 afr_changelog_post_op (call_frame_t *frame, xlator_t *this)
 {
-	afr_local_t  *local = NULL;
+        afr_local_t  *local = NULL;
+
+        local = frame->local;
+
+        if (is_afr_delayed_changelog_post_op_needed (frame, this))
+                afr_delayed_changelog_post_op (this, frame, local->fd, NULL);
+        else
+                afr_changelog_post_op_safe (frame, this);
+}
 
-	local = frame->local;
 
-	if (is_afr_delayed_changelog_post_op_needed (frame, this))
-		afr_delayed_changelog_post_op (this, frame, local->fd);
-	else
-		afr_changelog_post_op_now (frame, this);
+
+/* Wake up the sleeping/delayed post-op, and also register
+   a stub to have it resumed after this transaction
+   completely finishes.
+
+   The @stub gets saved in @local and gets resumed in
+   afr_local_cleanup()
+   */
+void
+afr_delayed_changelog_wake_resume (xlator_t *this, fd_t *fd, call_stub_t *stub)
+{
+        afr_delayed_changelog_post_op (this, NULL, fd, stub);
 }
 
 
 void
 afr_delayed_changelog_wake_up (xlator_t *this, fd_t *fd)
 {
-	afr_delayed_changelog_post_op (this, NULL, fd);
+        afr_delayed_changelog_post_op (this, NULL, fd, NULL);
 }
 
 
-int
+        int
 afr_transaction_resume (call_frame_t *frame, xlator_t *this)
 {
         afr_internal_lock_t *int_lock = NULL;
@@ -1411,7 +1787,18 @@ afr_transaction_resume (call_frame_t *frame, xlator_t *this)
         int_lock = &local->internal_lock;
         priv     = this->private;
 
-	afr_restore_lk_owner (frame);
+        if (local->transaction.eager_lock_on) {
+                /* We don't need to retain "local" in the
+                   fd list anymore, writes to all subvols
+                   are finished by now */
+                LOCK (&local->fd->lock);
+                {
+                        list_del_init (&local->transaction.eager_locked);
+                }
+                UNLOCK (&local->fd->lock);
+        }
+
+        afr_restore_lk_owner (frame);
 
         if (__fop_changelog_needed (frame, this)) {
                 afr_changelog_post_op (frame, this);
@@ -1433,7 +1820,8 @@ afr_transaction_resume (call_frame_t *frame, xlator_t *this)
  */
 
 void
-afr_transaction_fop_failed (call_frame_t *frame, xlator_t *this, int child_index)
+afr_transaction_fop_failed (call_frame_t *frame, xlator_t *this,
+                            int child_index)
 {
         afr_local_t *   local = NULL;
         afr_private_t * priv  = NULL;
@@ -1442,9 +1830,92 @@ afr_transaction_fop_failed (call_frame_t *frame, xlator_t *this, int child_index
         priv  = this->private;
 
         __mark_child_dead (local->pending, priv->child_count,
-                           child_index, local->transaction.type);
+                        child_index, local->transaction.type);
 }
 
+
+
+        static gf_boolean_t
+afr_locals_overlap (afr_local_t *local1, afr_local_t *local2)
+{
+        uint64_t start1 = local1->transaction.start;
+        uint64_t start2 = local2->transaction.start;
+        uint64_t end1 = 0;
+        uint64_t end2 = 0;
+
+        if (local1->transaction.len)
+                end1 = start1 + local1->transaction.len - 1;
+        else
+                end1 = ULLONG_MAX;
+
+        if (local2->transaction.len)
+                end2 = start2 + local2->transaction.len - 1;
+        else
+                end2 = ULLONG_MAX;
+
+        return ((end1 >= start2) && (end2 >= start1));
+}
+
+void
+afr_transaction_eager_lock_init (afr_local_t *local, xlator_t *this)
+{
+        afr_private_t *priv = NULL;
+        afr_fd_ctx_t  *fdctx = NULL;
+        afr_local_t   *each = NULL;
+
+        priv = this->private;
+
+        if (!local->fd)
+                return;
+
+        if (local->transaction.type != AFR_DATA_TRANSACTION)
+                return;
+
+        if (!priv->eager_lock)
+                return;
+
+        fdctx = afr_fd_ctx_get (local->fd, this);
+        if (!fdctx)
+                return;
+
+        if (afr_are_multiple_fds_opened (local->fd->inode, this))
+                return;
+        /*
+         * Once full file lock is acquired in eager-lock phase, overlapping
+         * writes do not compete for inode-locks, instead are transferred to the
+         * next writes. Because of this overlapping writes are not ordered.
+         * This can cause inconsistencies in replication.
+         * Example:
+         * Two overlapping writes w1, w2 are sent in parallel on same fd
+         * in two threads t1, t2.
+         * Both threads can execute afr_writev_wind in the following manner.
+         * t1 winds w1 on brick-0
+         * t2 winds w2 on brick-0
+         * t2 winds w2 on brick-1
+         * t1 winds w1 on brick-1
+         *
+         * This check makes sure the locks are not transferred for
+         * overlapping writes.
+         */
+        LOCK (&local->fd->lock);
+        {
+                list_for_each_entry (each, &fdctx->eager_locked,
+                                     transaction.eager_locked) {
+                        if (afr_locals_overlap (each, local)) {
+                                local->transaction.eager_lock_on = _gf_false;
+                                goto unlock;
+                        }
+                }
+
+                local->transaction.eager_lock_on = _gf_true;
+                list_add_tail (&local->transaction.eager_locked,
+                               &fdctx->eager_locked);
+        }
+unlock:
+        UNLOCK (&local->fd->lock);
+}
+
+
 int
 afr_transaction (call_frame_t *frame, xlator_t *this, afr_transaction_type type)
 {
@@ -1460,9 +1931,10 @@ afr_transaction (call_frame_t *frame, xlator_t *this, afr_transaction_type type)
         local->transaction.type   = type;
 
         ret = afr_transaction_local_init (local, this);
-        if (ret < 0) {
+        if (ret < 0)
             goto out;
-        }
+
+        afr_transaction_eager_lock_init (local, this);
 
         if (local->fd && local->transaction.eager_lock_on)
                 afr_set_lk_owner (frame, this, local->fd);
@@ -1471,6 +1943,9 @@ afr_transaction (call_frame_t *frame, xlator_t *this, afr_transaction_type type)
 
         if (!local->transaction.eager_lock_on && local->loc.inode) {
                 fd = fd_lookup (local->loc.inode, frame->root->pid);
+                if (fd == NULL)
+                        fd = fd_lookup_anonymous (local->loc.inode);
+
                 if (fd) {
                         afr_delayed_changelog_wake_up (this, fd);
                         fd_unref (fd);
diff --git a/xlators/cluster/afr/src/afr-transaction.h b/xlators/cluster/afr/src/afr-transaction.h
index e95bc5b14..fa626fd0d 100644
--- a/xlators/cluster/afr/src/afr-transaction.h
+++ b/xlators/cluster/afr/src/afr-transaction.h
@@ -23,6 +23,9 @@ afr_transaction_fop_failed (call_frame_t *frame, xlator_t *this,
 int
 afr_lock_server_count (afr_private_t *priv, afr_transaction_type type);
 
+afr_inodelk_t*
+afr_get_inodelk (afr_internal_lock_t *int_lock, char *dom);
+
 int32_t
 afr_transaction (call_frame_t *frame, xlator_t *this, afr_transaction_type type);
 
@@ -37,4 +40,12 @@ afr_set_delayed_post_op (call_frame_t *frame, xlator_t *this);
 void
 afr_delayed_changelog_wake_up (xlator_t *this, fd_t *fd);
 
+void
+__mark_all_success (int32_t *pending[], int child_count,
+                    afr_transaction_type type);
+gf_boolean_t
+afr_any_fops_failed (afr_local_t *local, afr_private_t *priv);
+
+gf_boolean_t
+afr_txn_nothing_failed (call_frame_t *frame, xlator_t *this);
 #endif /* __TRANSACTION_H__ */
diff --git a/xlators/cluster/afr/src/afr.c b/xlators/cluster/afr/src/afr.c
index bee10fd01..c724eb2ae 100644
--- a/xlators/cluster/afr/src/afr.c
+++ b/xlators/cluster/afr/src/afr.c
@@ -191,6 +191,8 @@ reconfigure (xlator_t *this, dict_t *options)
         /* Reset this so we re-discover in case the topology changed.  */
         GF_OPTION_RECONF ("readdir-failover", priv->readdir_failover, options,
                           bool, out);
+        GF_OPTION_RECONF ("ensure-durability", priv->ensure_durability, options,
+                          bool, out);
         priv->did_discovery = _gf_false;
 
         ret = 0;
@@ -335,6 +337,8 @@ init (xlator_t *this)
 
 	GF_OPTION_INIT ("post-op-delay-secs", priv->post_op_delay_secs, uint32, out);
         GF_OPTION_INIT ("readdir-failover", priv->readdir_failover, bool, out);
+        GF_OPTION_INIT ("ensure-durability", priv->ensure_durability, bool,
+                        out);
 
         priv->wait_count = 1;
 
@@ -376,8 +380,6 @@ init (xlator_t *this)
                                    AFR_XATTR_PREFIX,
                                    trav->xlator->name);
                 if (-1 == ret) {
-                        gf_log (this->name, GF_LOG_ERROR,
-                                "asprintf failed to set pending key");
                         ret = -ENOMEM;
                         goto out;
                 }
@@ -386,6 +388,13 @@ init (xlator_t *this)
                 i++;
         }
 
+        ret = gf_asprintf (&priv->sh_domain, AFR_SH_DATA_DOMAIN_FMT,
+                           this->name);
+        if (-1 == ret) {
+                ret = -ENOMEM;
+                goto out;
+        }
+
         priv->last_event = GF_CALLOC (child_count, sizeof (*priv->last_event),
                                       gf_afr_mt_int32_t);
         if (!priv->last_event) {
@@ -430,15 +439,18 @@ init (xlator_t *this)
         if (!priv->shd.timer)
                 goto out;
 
-        priv->shd.healed = eh_new (AFR_EH_HEALED_LIMIT, _gf_false);
+        priv->shd.healed = eh_new (AFR_EH_HEALED_LIMIT, _gf_false,
+                                   _destroy_shd_event_data);
         if (!priv->shd.healed)
                 goto out;
 
-        priv->shd.heal_failed = eh_new (AFR_EH_HEAL_FAIL_LIMIT, _gf_false);
+        priv->shd.heal_failed = eh_new (AFR_EH_HEAL_FAIL_LIMIT, _gf_false,
+                                        _destroy_shd_event_data);
         if (!priv->shd.heal_failed)
                 goto out;
 
-        priv->shd.split_brain = eh_new (AFR_EH_SPLIT_BRAIN_LIMIT, _gf_false);
+        priv->shd.split_brain = eh_new (AFR_EH_SPLIT_BRAIN_LIMIT, _gf_false,
+                                        _destroy_shd_event_data);
         if (!priv->shd.split_brain)
                 goto out;
 
@@ -448,7 +460,9 @@ init (xlator_t *this)
         priv->root_inode = inode_ref (this->itable->root);
         GF_OPTION_INIT ("node-uuid", priv->shd.node_uuid, str, out);
         GF_OPTION_INIT ("heal-timeout", priv->shd.timeout, int32, out);
-
+        ret = afr_initialise_statistics (this);
+        if (ret)
+                goto out;
         ret = 0;
 out:
         return ret;
@@ -483,6 +497,9 @@ struct xlator_fops fops = {
         .finodelk    = afr_finodelk,
         .entrylk     = afr_entrylk,
         .fentrylk    = afr_fentrylk,
+	.fallocate   = afr_fallocate,
+	.discard     = afr_discard,
+        .zerofill    = afr_zerofill,
 
         /* inode read */
         .access      = afr_access,
@@ -765,5 +782,12 @@ struct volume_options options[] = {
           .description = "readdir(p) will not failover if this option is off",
           .default_value = "on",
         },
+        { .key = {"ensure-durability"},
+          .type = GF_OPTION_TYPE_BOOL,
+          .description = "Afr performs fsyncs for transactions if this "
+                         "option is on to make sure the changelogs/data is "
+                         "written to the disk",
+          .default_value = "on",
+        },
         { .key  = {NULL} },
 };
diff --git a/xlators/cluster/afr/src/afr.h b/xlators/cluster/afr/src/afr.h
index 978339017..21064db58 100644
--- a/xlators/cluster/afr/src/afr.h
+++ b/xlators/cluster/afr/src/afr.h
@@ -28,8 +28,10 @@
 #define AFR_XATTR_PREFIX "trusted.afr"
 #define AFR_PATHINFO_HEADER "REPLICATE:"
 #define AFR_SH_READDIR_SIZE_KEY "self-heal-readdir-size"
+#define AFR_SH_DATA_DOMAIN_FMT "%s:self-heal"
 
 #define AFR_LOCKEE_COUNT_MAX    3
+#define AFR_DOM_COUNT_MAX    3
 
 struct _pump_private;
 
@@ -86,26 +88,30 @@ typedef struct afr_inode_ctx_ {
         int32_t  *fresh_children;//increasing order of latency
         afr_spb_state_t mdata_spb;
         afr_spb_state_t data_spb;
+        uint32_t        open_fd_count;
 } afr_inode_ctx_t;
 
 typedef enum {
         NONE,
         INDEX,
+        INDEX_TO_BE_HEALED,
         FULL,
 } afr_crawl_type_t;
 
 typedef struct afr_self_heald_ {
-        gf_boolean_t     enabled;
-        gf_boolean_t     iamshd;
-        afr_crawl_type_t *pending;
-        gf_boolean_t     *inprogress;
-        afr_child_pos_t  *pos;
-        gf_timer_t       **timer;
-        eh_t             *healed;
-        eh_t             *heal_failed;
-        eh_t             *split_brain;
-        char             *node_uuid;
-        int              timeout;
+        gf_boolean_t            enabled;
+        gf_boolean_t            iamshd;
+        afr_crawl_type_t        *pending;
+        gf_boolean_t            *inprogress;
+        afr_child_pos_t         *pos;
+        gf_timer_t              **timer;
+        eh_t                    *healed;
+        eh_t                    *heal_failed;
+        eh_t                    *split_brain;
+        eh_t                    **statistics;
+        void                    **crawl_events;
+        char                    *node_uuid;
+        int                     timeout;
 } afr_self_heald_t;
 
 typedef struct _afr_private {
@@ -170,9 +176,38 @@ typedef struct _afr_private {
         gf_boolean_t           did_discovery;
         gf_boolean_t           readdir_failover;
         uint64_t               sh_readdir_size;
+        gf_boolean_t           ensure_durability;
+        char                   *sh_domain;
 } afr_private_t;
 
+typedef enum {
+        AFR_SELF_HEAL_NOT_ATTEMPTED,
+        AFR_SELF_HEAL_STARTED,
+        AFR_SELF_HEAL_FAILED,
+        AFR_SELF_HEAL_SYNC_BEGIN,
+} afr_self_heal_status;
+
 typedef struct {
+        afr_self_heal_status gfid_or_missing_entry_self_heal;
+        afr_self_heal_status metadata_self_heal;
+        afr_self_heal_status data_self_heal;
+        afr_self_heal_status entry_self_heal;
+} afr_sh_status_for_all_type;
+
+typedef enum {
+        AFR_SELF_HEAL_ENTRY,
+        AFR_SELF_HEAL_METADATA,
+        AFR_SELF_HEAL_DATA,
+        AFR_SELF_HEAL_GFID_OR_MISSING_ENTRY,
+        AFR_SELF_HEAL_INVALID = -1,
+} afr_self_heal_type;
+
+typedef enum {
+        AFR_CHECK_ALL,
+        AFR_CHECK_SPECIFIC,
+} afr_sh_fail_check_type;
+
+struct afr_self_heal_ {
         /* External interface: These are variables (some optional) that
            are set by whoever has triggered self-heal */
 
@@ -249,10 +284,10 @@ typedef struct {
         const char *linkname;
         gf_boolean_t entries_skipped;
 
-        int   op_failed;
         gf_boolean_t actual_sh_started;
         gf_boolean_t sync_done;
         gf_boolean_t data_lock_held;
+        gf_boolean_t sh_dom_lock_held;
         gf_boolean_t eof_reached;
         fd_t  *healing_fd;
         int   file_has_holes;
@@ -263,13 +298,17 @@ typedef struct {
         uint8_t *checksum;
         afr_post_remove_call_t post_remove_call;
 
-        loc_t parent_loc;
+        char    *data_sh_info;
+        char    *metadata_sh_info;
 
+        loc_t parent_loc;
         call_frame_t *orig_frame;
         call_frame_t *old_loop_frame;
         gf_boolean_t unwound;
 
         afr_sh_algo_private_t *private;
+        afr_sh_status_for_all_type  afr_all_sh_status;
+        afr_self_heal_type       sh_type_in_action;
 
         struct afr_sh_algorithm  *algo;
         afr_lock_cbk_t data_lock_success_handler;
@@ -282,7 +321,9 @@ typedef struct {
         void (*gfid_sh_success_cbk) (call_frame_t *sh_frame, xlator_t *this);
 
         call_frame_t *sh_frame;
-} afr_self_heal_t;
+};
+
+typedef struct afr_self_heal_ afr_self_heal_t;
 
 typedef enum {
         AFR_DATA_TRANSACTION,          /* truncate, write, ... */
@@ -356,12 +397,19 @@ int
 afr_entry_lockee_cmp (const void *l1, const void *l2);
 
 typedef struct {
+        char    *domain; /* Domain on which inodelk is taken */
+        struct gf_flock flock;
+        unsigned char *locked_nodes;
+        int32_t lock_count;
+} afr_inodelk_t;
+
+typedef struct {
         loc_t *lk_loc;
-        struct gf_flock lk_flock;
 
         int                     lockee_count;
         afr_entry_lockee_t      lockee[AFR_LOCKEE_COUNT_MAX];
 
+        afr_inodelk_t       inodelk[AFR_DOM_COUNT_MAX];
         const char *lk_basename;
         const char *lower_basename;
         const char *higher_basename;
@@ -370,13 +418,11 @@ typedef struct {
 
         unsigned char *locked_nodes;
         unsigned char *lower_locked_nodes;
-        unsigned char *inode_locked_nodes;
 
         selfheal_lk_type_t selfheal_lk_type;
         transaction_lk_type_t transaction_lk_type;
 
         int32_t lock_count;
-        int32_t inodelk_lock_count;
         int32_t entrylk_lock_count;
 
         uint64_t lock_number;
@@ -387,6 +433,7 @@ typedef struct {
         int32_t lock_op_ret;
         int32_t lock_op_errno;
         afr_lock_cbk_t lock_cbk;
+        char *domain; /* Domain on which inode/entry lock/unlock in progress.*/
 } afr_internal_lock_t;
 
 typedef struct _afr_locked_fd {
@@ -406,9 +453,11 @@ typedef struct _afr_local {
         unsigned int call_count;
         unsigned int success_count;
         unsigned int enoent_count;
+        uint32_t     open_fd_count;
+        gf_boolean_t update_open_fd_count;
 
 
-        unsigned int govinda_gOvinda;
+        unsigned int unhealable;
 
         unsigned int read_child_index;
         unsigned char read_child_returned;
@@ -448,9 +497,23 @@ typedef struct _afr_local {
         int      optimistic_change_log;
 	gf_boolean_t      delayed_post_op;
 
-        /*
-          This struct contains the arguments for the "continuation"
-          (scheme-like) of fops
+
+	/* Is the current writev() going to perform a stable write?
+	   i.e, is fd->flags or @flags writev param have O_SYNC or
+	   O_DSYNC?
+	*/
+        gf_boolean_t      stable_write;
+
+        /* This write appended to the file. Nnot necessarily O_APPEND,
+           just means the offset of write was at the end of file.
+        */
+        gf_boolean_t      append_write;
+
+        int allow_sh_for_running_transaction;
+
+
+        /* This struct contains the arguments for the "continuation"
+           (scheme-like) of fops
         */
 
         int   op;
@@ -546,7 +609,9 @@ typedef struct _afr_local {
                 struct {
                         struct iatt prebuf;
                         struct iatt postbuf;
+                } inode_wfop; //common structure for all inode-write-fops
 
+                struct {
                         int32_t op_ret;
 
                         struct iovec *vector;
@@ -557,34 +622,21 @@ typedef struct _afr_local {
                 } writev;
 
                 struct {
-                        struct iatt prebuf;
-                        struct iatt postbuf;
-                } fsync;
-
-                struct {
                         off_t offset;
-                        struct iatt prebuf;
-                        struct iatt postbuf;
                 } truncate;
 
                 struct {
                         off_t offset;
-                        struct iatt prebuf;
-                        struct iatt postbuf;
                 } ftruncate;
 
                 struct {
                         struct iatt in_buf;
                         int32_t valid;
-                        struct iatt preop_buf;
-                        struct iatt postop_buf;
                 } setattr;
 
                 struct {
                         struct iatt in_buf;
                         int32_t valid;
-                        struct iatt preop_buf;
-                        struct iatt postop_buf;
                 } fsetattr;
 
                 struct {
@@ -646,6 +698,26 @@ typedef struct _afr_local {
                         dict_t *params;
                         char *linkpath;
                 } symlink;
+
+		struct {
+			int32_t mode;
+			off_t offset;
+			size_t len;
+		} fallocate;
+
+		struct {
+			off_t offset;
+			size_t len;
+		} discard;
+
+                struct {
+                        off_t offset;
+                        size_t len;
+                        struct iatt prebuf;
+                        struct iatt postbuf;
+                } zerofill;
+
+
         } cont;
 
         struct {
@@ -662,6 +734,17 @@ typedef struct _afr_local {
 
                 afr_transaction_type type;
 
+		/* pre-compute the post piggyback status before
+		   entering POST-OP phase
+		*/
+		int              *postop_piggybacked;
+
+		/* stub to resume on destruction
+		   of the transaction frame */
+		call_stub_t      *resume_stub;
+
+		struct list_head  eager_locked;
+
                 int32_t         **txn_changelog;//changelog after pre+post ops
                 unsigned char   *pre_op;
 
@@ -723,6 +806,14 @@ typedef struct {
 	gf_timer_t        *delay_timer;
 	call_frame_t      *delay_frame;
         int               call_child;
+
+	/* set if any write on this fd was a non stable write
+	   (i.e, without O_SYNC or O_DSYNC)
+	*/
+	gf_boolean_t      witnessed_unstable_write;
+
+	/* list of frames currently in progress */
+	struct list_head  eager_locked;
 } afr_fd_ctx_t;
 
 
@@ -799,8 +890,8 @@ afr_blocking_lock (call_frame_t *frame, xlator_t *this);
 int
 afr_internal_lock_finish (call_frame_t *frame, xlator_t *this);
 
-void
-afr_lk_transfer_datalock (call_frame_t *dst, call_frame_t *src,
+int
+afr_lk_transfer_datalock (call_frame_t *dst, call_frame_t *src, char *dom,
                           unsigned int child_count);
 
 int pump_start (call_frame_t *frame, xlator_t *this);
@@ -1078,4 +1169,44 @@ afr_xattr_array_destroy (dict_t **xattr, unsigned int child_count);
         }                                                                \
 } while (0);
 
+
+#define AFR_SBRAIN_MSG "Failed on %s as split-brain is seen. Returning EIO."
+
+#define AFR_SBRAIN_CHECK_FD(fd, label) do {                              \
+        if (fd->inode && afr_is_split_brain (this, fd->inode)) {        \
+                op_errno = EIO;                                         \
+                gf_log (this->name, GF_LOG_WARNING,                     \
+                        AFR_SBRAIN_MSG ,uuid_utoa (fd->inode->gfid));   \
+                goto label;                                             \
+        }                                                               \
+} while (0)
+
+#define AFR_SBRAIN_CHECK_LOC(loc, label) do {                           \
+        if (loc->inode && afr_is_split_brain (this, loc->inode)) {      \
+                op_errno = EIO;                                         \
+                loc_path (loc, NULL);                                   \
+                gf_log (this->name, GF_LOG_WARNING,                     \
+                        AFR_SBRAIN_MSG , loc->path);                    \
+                goto label;                                             \
+        }                                                               \
+} while (0)
+
+int
+afr_fd_report_unstable_write (xlator_t *this, fd_t *fd);
+
+gf_boolean_t
+afr_fd_has_witnessed_unstable_write (xlator_t *this, fd_t *fd);
+
+void
+afr_delayed_changelog_wake_resume (xlator_t *this, fd_t *fd, call_stub_t *stub);
+
+int
+afr_inodelk_init (afr_inodelk_t *lk, char *dom, size_t child_count);
+
+void
+afr_handle_open_fd_count (call_frame_t *frame, xlator_t *this);
+
+afr_inode_ctx_t*
+afr_inode_ctx_get (inode_t *inode, xlator_t *this);
+
 #endif /* __AFR_H__ */
diff --git a/xlators/cluster/afr/src/pump.c b/xlators/cluster/afr/src/pump.c
index d3823383c..a7f72fb30 100644
--- a/xlators/cluster/afr/src/pump.c
+++ b/xlators/cluster/afr/src/pump.c
@@ -2443,6 +2443,7 @@ init (xlator_t *this)
 	priv->metadata_change_log = 1;
 	priv->entry_change_log    = 1;
         priv->use_afr_in_pump = 1;
+        priv->sh_readdir_size = 65536;
 
 	/* Locking options */
 
@@ -2500,6 +2501,12 @@ init (xlator_t *this)
 		i++;
 	}
 
+        ret = gf_asprintf (&priv->sh_domain, "%s-self-heal", this->name);
+        if (-1 == ret) {
+                op_errno = ENOMEM;
+                goto out;
+        }
+
         priv->first_lookup = 1;
         priv->root_inode = NULL;
 
@@ -2531,7 +2538,7 @@ init (xlator_t *this)
                 goto out;
         }
 
-	pump_priv->env = syncenv_new (0);
+	pump_priv->env = this->ctx->env;
         if (!pump_priv->env) {
                 gf_log (this->name, GF_LOG_ERROR,
                         "Could not create new sync-environment");
@@ -2572,9 +2579,6 @@ fini (xlator_t *this)
         if (!pump_priv)
                 goto afr_priv;
 
-        if (pump_priv->env)
-                syncenv_destroy (pump_priv->env);
-
         GF_FREE (pump_priv->resume_path);
         LOCK_DESTROY (&pump_priv->resume_path_lock);
         LOCK_DESTROY (&pump_priv->pump_state_lock);
diff --git a/xlators/cluster/dht/src/Makefile.am b/xlators/cluster/dht/src/Makefile.am
index 5324d2115..174bea841 100644
--- a/xlators/cluster/dht/src/Makefile.am
+++ b/xlators/cluster/dht/src/Makefile.am
@@ -4,7 +4,7 @@ xlatordir = $(libdir)/glusterfs/$(PACKAGE_VERSION)/xlator/cluster
 
 dht_common_source = dht-layout.c dht-helper.c dht-linkfile.c dht-rebalance.c \
 	dht-selfheal.c dht-rename.c dht-hashfn.c dht-diskusage.c \
-	dht-common.c dht-inode-write.c dht-inode-read.c \
+	dht-common.c dht-inode-write.c dht-inode-read.c dht-shared.c \
 	$(top_builddir)/xlators/lib/src/libxlator.c
 
 dht_la_SOURCES = $(dht_common_source) dht.c
diff --git a/xlators/cluster/dht/src/dht-common.c b/xlators/cluster/dht/src/dht-common.c
index f95bb84e6..8f61339e6 100644
--- a/xlators/cluster/dht/src/dht-common.c
+++ b/xlators/cluster/dht/src/dht-common.c
@@ -22,6 +22,7 @@
 #include "dht-common.h"
 #include "defaults.h"
 #include "byte-order.h"
+#include "glusterfs-acl.h"
 
 #include <sys/time.h>
 #include <libgen.h>
@@ -62,6 +63,11 @@ dht_aggregate (dict_t *this, char *key, data_t *value, void *data)
                 }
 
                 *size = hton64 (ntoh64 (*size) + ntoh64 (*ptr));
+
+        } else if (fnmatch (GF_XATTR_STIME_PATTERN, key, FNM_NOESCAPE) == 0) {
+                ret = gf_get_min_stime (THIS, dst, key, value);
+                if (ret < 0)
+                        return ret;
         } else {
                 /* compare user xattrs only */
                 if (!strncmp (key, "user.", strlen ("user."))) {
@@ -148,9 +154,11 @@ dht_discover_complete (xlator_t *this, call_frame_t *discover_frame)
         int              op_errno = 0;
         int              ret = -1;
         dht_layout_t    *layout = NULL;
+        dht_conf_t      *conf = NULL;
 
         local = discover_frame->local;
         layout = local->layout;
+        conf = this->private;
 
         LOCK(&discover_frame->lock);
         {
@@ -193,11 +201,14 @@ dht_discover_complete (xlator_t *this, call_frame_t *discover_frame)
                                 "(overlaps/holes present: %s, "
                                 "ENOENT errors: %d)", local->loc.path,
                                 (ret < 0) ? "yes" : "no", (ret > 0) ? ret : 0);
-                        op_errno = EINVAL;
-                        goto out;
+                        if ((ret > 0) && (ret == conf->subvolume_cnt)) {
+                                op_errno = ESTALE;
+                                goto out;
+                        }
                 }
 
-                dht_layout_set (this, local->inode, layout);
+                if (local->inode)
+                        dht_layout_set (this, local->inode, layout);
         }
 
         DHT_STACK_UNWIND (lookup, main_frame, local->op_ret, local->op_errno,
@@ -226,6 +237,7 @@ dht_discover_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
         int           is_dir                  = 0;
         int           is_linkfile             = 0;
         int           attempt_unwind          = 0;
+        dht_conf_t   *conf                    = 0;
 
         GF_VALIDATE_OR_GOTO ("dht", frame, out);
         GF_VALIDATE_OR_GOTO ("dht", this, out);
@@ -235,6 +247,7 @@ dht_discover_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
 
         local = frame->local;
         prev  = cookie;
+        conf = this->private;
 
         layout = local->layout;
 
@@ -269,7 +282,8 @@ dht_discover_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                         goto unlock;
                 }
 
-                is_linkfile = check_is_linkfile (inode, stbuf, xattr);
+                is_linkfile = check_is_linkfile (inode, stbuf, xattr,
+                                                 conf->link_xattr_name);
                 is_dir = check_is_dir (inode, stbuf, xattr);
 
                 if (is_dir) {
@@ -328,23 +342,20 @@ dht_discover (call_frame_t *frame, xlator_t *this, loc_t *loc)
         int          i = 0;
         call_frame_t *discover_frame = NULL;
 
-
         conf = this->private;
         local = frame->local;
 
-        ret = dict_set_uint32 (local->xattr_req,
-                               "trusted.glusterfs.dht", 4 * 4);
+        ret = dict_set_uint32 (local->xattr_req, conf->xattr_name, 4 * 4);
         if (ret)
                 gf_log (this->name, GF_LOG_WARNING,
-                        "%s: failed to set 'trusted.glusterfs.dht' key",
-                        loc->path);
+                        "%s: failed to set '%s' key",
+                        loc->path, conf->xattr_name);
 
-        ret = dict_set_uint32 (local->xattr_req,
-                               "trusted.glusterfs.dht.linkto", 256);
+        ret = dict_set_uint32 (local->xattr_req, conf->link_xattr_name, 256);
         if (ret)
                 gf_log (this->name, GF_LOG_WARNING,
-                        "%s: failed to set 'trusted.glusterfs.dht.linkto' key",
-                        loc->path);
+                        "%s: failed to set '%s' key",
+                        loc->path, conf->link_xattr_name);
 
         call_cnt        = conf->subvolume_cnt;
         local->call_cnt = call_cnt;
@@ -430,7 +441,7 @@ dht_lookup_dir_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                                         op_ret, op_errno, xattr);
 
                 if (op_ret == -1) {
-                        local->op_errno = ENOENT;
+                        local->op_errno = op_errno;
                         gf_log (this->name, GF_LOG_DEBUG,
                                 "lookup of %s on %s returned error (%s)",
                                 local->loc.path, prev->this->name,
@@ -585,7 +596,8 @@ dht_revalidate_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                 layout = local->layout;
 
                 is_dir = check_is_dir (inode, stbuf, xattr);
-                is_linkfile = check_is_linkfile (inode, stbuf, xattr);
+                is_linkfile = check_is_linkfile (inode, stbuf, xattr,
+                                                 conf->link_xattr_name);
 
                 if (is_linkfile) {
                         gf_log (this->name, GF_LOG_INFO,
@@ -597,7 +609,7 @@ dht_revalidate_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                 }
 
                 if (is_dir) {
-                        ret = dht_dir_has_layout (xattr);
+                        ret = dht_dir_has_layout (xattr, conf->xattr_name);
                         if (ret >= 0) {
                                 if (is_greater_time(local->stbuf.ia_ctime,
                                                     local->stbuf.ia_ctime_nsec,
@@ -886,7 +898,7 @@ dht_lookup_everywhere_done (call_frame_t *frame, xlator_t *this)
                 hashed_subvol->name);
 
         ret = dht_linkfile_create (frame,
-                                   dht_lookup_linkfile_create_cbk,
+                                   dht_lookup_linkfile_create_cbk, this,
                                    cached_subvol, hashed_subvol, &local->loc);
 
         return ret;
@@ -924,8 +936,9 @@ dht_lookup_everywhere_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
         xlator_t     *subvol        = NULL;
         loc_t        *loc           = NULL;
         xlator_t     *link_subvol   = NULL;
-        int           ret = -1;
-        int32_t       fd_count = 0;
+        int           ret           = -1;
+        int32_t       fd_count      = 0;
+        dht_conf_t   *conf          = NULL;
 
         GF_VALIDATE_OR_GOTO ("dht", frame, out);
         GF_VALIDATE_OR_GOTO ("dht", this, out);
@@ -935,6 +948,7 @@ dht_lookup_everywhere_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
 
         local  = frame->local;
         loc    = &local->loc;
+        conf   = this->private;
 
         prev   = cookie;
         subvol = prev->this;
@@ -956,7 +970,8 @@ dht_lookup_everywhere_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                                 loc->path, prev->this->name);
                 }
 
-                is_linkfile = check_is_linkfile (inode, buf, xattr);
+                is_linkfile = check_is_linkfile (inode, buf, xattr,
+                                                 conf->link_xattr_name);
                 is_dir = check_is_dir (inode, buf, xattr);
 
                 if (is_linkfile) {
@@ -1117,7 +1132,7 @@ dht_lookup_linkfile_cbk (call_frame_t *frame, void *cookie,
                 goto err;
         }
 
-        if (check_is_linkfile (inode, stbuf, xattr)) {
+        if (check_is_linkfile (inode, stbuf, xattr, conf->link_xattr_name)) {
                 gf_log (this->name, GF_LOG_INFO,
                         "lookup of %s on %s (following linkfile) reached link",
                         local->loc.path, subvol->name);
@@ -1294,7 +1309,8 @@ dht_lookup_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                 goto out;
         }
 
-        is_linkfile = check_is_linkfile (inode, stbuf, xattr);
+        is_linkfile = check_is_linkfile (inode, stbuf, xattr,
+                                         conf->link_xattr_name);
 
         if (!is_linkfile) {
                 /* non-directory and not a linkfile */
@@ -1399,7 +1415,6 @@ dht_lookup (call_frame_t *frame, xlator_t *this,
         VALIDATE_OR_GOTO (this, err);
         VALIDATE_OR_GOTO (loc, err);
         VALIDATE_OR_GOTO (loc->inode, err);
-        VALIDATE_OR_GOTO (loc->path, err);
 
         conf = this->private;
         if (!conf)
@@ -1474,7 +1489,7 @@ dht_lookup (call_frame_t *frame, xlator_t *this,
                  *       revalidates directly go to the cached-subvolume.
                  */
                 ret = dict_set_uint32 (local->xattr_req,
-                                       "trusted.glusterfs.dht", 4 * 4);
+                                       conf->xattr_name, 4 * 4);
 
                 if (IA_ISDIR (local->inode->ia_type)) {
                         local->call_cnt = call_cnt = conf->subvolume_cnt;
@@ -1509,10 +1524,10 @@ dht_lookup (call_frame_t *frame, xlator_t *this,
         do_fresh_lookup:
                 /* TODO: remove the hard-coding */
                 ret = dict_set_uint32 (local->xattr_req,
-                                       "trusted.glusterfs.dht", 4 * 4);
+                                       conf->xattr_name, 4 * 4);
 
                 ret = dict_set_uint32 (local->xattr_req,
-                                       DHT_LINKFILE_KEY, 256);
+                                       conf->link_xattr_name, 256);
 
                 /* need it for self-healing linkfiles which is
                    'in-migration' state */
@@ -1620,7 +1635,8 @@ dht_unlink_linkfile_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
 
         LOCK (&frame->lock);
         {
-                if (op_ret == -1) {
+                if ((op_ret == -1) && !((op_errno == ENOENT) ||
+                                        (op_errno == ENOTCONN))) {
                         local->op_errno = op_errno;
                         gf_log (this->name, GF_LOG_DEBUG,
                                 "subvolume %s returned -1 (%s)",
@@ -1633,7 +1649,7 @@ dht_unlink_linkfile_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
 unlock:
         UNLOCK (&frame->lock);
 
-        if (op_ret == -1)
+        if (local->op_ret == -1)
                 goto err;
 
         cached_subvol = dht_subvol_get_cached (this, local->loc.inode);
@@ -1657,41 +1673,6 @@ err:
         return 0;
 }
 
-static int
-dht_ufo_xattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
-                   int op_ret, int op_errno, dict_t *xdata)
-{
-        dht_local_t  *local = NULL;
-        int           this_call_cnt = 0;
-        call_frame_t *prev = NULL;
-
-        local = frame->local;
-        prev = cookie;
-
-        LOCK (&frame->lock);
-        {
-                if (op_ret == -1) {
-                        local->op_ret = -1;
-                        local->op_errno = op_errno;
-                        gf_log (this->name, GF_LOG_DEBUG,
-                                "subvolume %s returned -1 (%s)",
-                                prev->this->name, strerror (op_errno));
-                        goto unlock;
-                }
-        }
-unlock:
-        UNLOCK (&frame->lock);
-
-        this_call_cnt = dht_frame_return (frame);
-        if (is_last_call (this_call_cnt)) {
-                DHT_STACK_UNWIND (setxattr, frame, local->op_ret,
-                                  local->op_errno, NULL);
-        }
-
-        return 0;
-}
-
-
 int
 dht_err_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
              int op_ret, int op_errno, dict_t *xdata)
@@ -1807,6 +1788,7 @@ dht_vgetxattr_alloc_and_fill (dht_local_t *local, dict_t *xattr, xlator_t *this,
                 }
 
                 (void) strcat (local->xattr_val, value);
+                (void) strcat (local->xattr_val, " ");
                 local->op_ret = 0;
         }
 
@@ -1831,6 +1813,8 @@ dht_vgetxattr_fill_and_set (dht_local_t *local, dict_t **dict, xlator_t *this,
         if (!*dict)
                 goto out;
 
+        local->xattr_val[strlen (local->xattr_val) - 1] = '\0';
+
         /* we would need max this many bytes to create xattr string
          * extra 40 bytes is just an estimated amount of additional
          * space required as we include translator name and some
@@ -2009,10 +1993,13 @@ dht_getxattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
 {
         int             this_call_cnt = 0;
         dht_local_t     *local = NULL;
+        dht_conf_t      *conf = NULL;
 
         VALIDATE_OR_GOTO (frame, out);
         VALIDATE_OR_GOTO (frame->local, out);
+        VALIDATE_OR_GOTO (this->private, out);
 
+        conf = this->private;
         local = frame->local;
 
         this_call_cnt = dht_frame_return (frame);
@@ -2020,8 +2007,8 @@ dht_getxattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
         if (!xattr || (op_ret == -1))
                 goto out;
 
-        if (dict_get (xattr, "trusted.glusterfs.dht")) {
-                dict_del (xattr, "trusted.glusterfs.dht");
+        if (dict_get (xattr, conf->xattr_name)) {
+                dict_del (xattr, conf->xattr_name);
         }
         local->op_ret = 0;
 
@@ -2054,6 +2041,67 @@ dht_getxattr_unwind (call_frame_t *frame,
 
 
 int
+dht_getxattr_get_real_filename_cbk (call_frame_t *frame, void *cookie,
+				    xlator_t *this, int op_ret, int op_errno,
+				    dict_t *xattr, dict_t *xdata)
+{
+        int             this_call_cnt = 0;
+        dht_local_t     *local = NULL;
+
+
+        local = frame->local;
+
+	if (op_ret != -1) {
+		if (local->xattr)
+			dict_unref (local->xattr);
+		local->xattr = dict_ref (xattr);
+
+		if (local->xattr_req)
+			dict_unref (local->xattr_req);
+		local->xattr_req = dict_ref (xdata);
+	}
+
+	this_call_cnt = dht_frame_return (frame);
+	if (is_last_call (this_call_cnt)) {
+		DHT_STACK_UNWIND (getxattr, frame, local->op_ret, op_errno,
+				  local->xattr, local->xattr_req);
+	}
+
+	return 0;
+}
+
+
+int
+dht_getxattr_get_real_filename (call_frame_t *frame, xlator_t *this,
+				loc_t *loc, const char *key, dict_t *xdata)
+{
+	dht_local_t     *local = NULL;
+	int              i = 0;
+	dht_layout_t    *layout = NULL;
+	int              cnt = 0;
+	xlator_t        *subvol = NULL;
+
+
+	local = frame->local;
+	layout = local->layout;
+
+	cnt = local->call_cnt = layout->cnt;
+
+	local->op_ret = -1;
+	local->op_errno = ENODATA;
+
+	for (i = 0; i < cnt; i++) {
+		subvol = layout->list[i].xlator;
+		STACK_WIND (frame, dht_getxattr_get_real_filename_cbk,
+			    subvol, subvol->fops->getxattr,
+			    loc, key, xdata);
+	}
+
+	return 0;
+}
+
+
+int
 dht_getxattr (call_frame_t *frame, xlator_t *this,
               loc_t *loc, const char *key, dict_t *xdata)
 #define DHT_IS_DIR(layout)  (layout->cnt > 1)
@@ -2074,7 +2122,6 @@ dht_getxattr (call_frame_t *frame, xlator_t *this,
         VALIDATE_OR_GOTO (this, err);
         VALIDATE_OR_GOTO (loc, err);
         VALIDATE_OR_GOTO (loc->inode, err);
-        VALIDATE_OR_GOTO (loc->path, err);
         VALIDATE_OR_GOTO (this->private, err);
 
         conf   = this->private;
@@ -2102,6 +2149,14 @@ dht_getxattr (call_frame_t *frame, xlator_t *this,
                 }
         }
 
+	if (key &&
+	    (strncmp (key, GF_XATTR_GET_REAL_FILENAME_KEY,
+		      strlen (GF_XATTR_GET_REAL_FILENAME_KEY)) == 0)
+	    && DHT_IS_DIR(layout)) {
+		dht_getxattr_get_real_filename (frame, this, loc, key, xdata);
+		return 0;
+	}
+
         /* for file use cached subvolume (obviously!): see if {}
          * below
          * for directory:
@@ -2111,8 +2166,9 @@ dht_getxattr (call_frame_t *frame, xlator_t *this,
          * NOTE: Don't trust inode here, as that may not be valid
          *       (until inode_link() happens)
          */
-        if (key && (strcmp (key, GF_XATTR_PATHINFO_KEY) == 0)
-            && DHT_IS_DIR(layout)) {
+        if (key && DHT_IS_DIR(layout) &&
+            ((strcmp (key, GF_XATTR_PATHINFO_KEY) == 0)
+             || (strcmp (key, GF_XATTR_NODE_UUID_KEY) == 0))) {
                 (void) strncpy (local->xsel, key, 256);
                 cnt = local->call_cnt = layout->cnt;
                 for (i = 0; i < cnt; i++) {
@@ -2183,7 +2239,8 @@ dht_getxattr (call_frame_t *frame, xlator_t *this,
                 if (cluster_getmarkerattr (frame, this, loc, key,
                                            local, dht_getxattr_unwind,
                                            sub_volumes, cnt,
-                                           MARKER_UUID_TYPE, conf->vol_uuid)) {
+                                           MARKER_UUID_TYPE, marker_uuid_default_gauge,
+                                           conf->vol_uuid)) {
                         op_errno = EINVAL;
                         goto err;
                 }
@@ -2207,6 +2264,7 @@ dht_getxattr (call_frame_t *frame, xlator_t *this,
                                                    local, dht_getxattr_unwind,
                                                    sub_volumes, cnt,
                                                    MARKER_XTIME_TYPE,
+                                                   marker_xtime_default_gauge,
                                                    conf->vol_uuid)) {
                                 op_errno = EINVAL;
                                 goto err;
@@ -2308,13 +2366,17 @@ dht_fsetxattr (call_frame_t *frame, xlator_t *this,
         xlator_t     *subvol   = NULL;
         dht_local_t  *local    = NULL;
         int           op_errno = EINVAL;
+        dht_conf_t   *conf     = NULL;
 
         VALIDATE_OR_GOTO (frame, err);
         VALIDATE_OR_GOTO (this, err);
         VALIDATE_OR_GOTO (fd, err);
         VALIDATE_OR_GOTO (fd->inode, err);
+        VALIDATE_OR_GOTO (this->private, err);
 
-        GF_IF_INTERNAL_XATTR_GOTO ("trusted.glusterfs.dht*", xattr,
+        conf = this->private;
+
+        GF_IF_INTERNAL_XATTR_GOTO (conf->wild_xattr_name, xattr,
                                    op_errno, err);
 
         local = dht_local_init (frame, NULL, fd, GF_FOP_FSETXATTR);
@@ -2418,12 +2480,12 @@ dht_setxattr (call_frame_t *frame, xlator_t *this,
         VALIDATE_OR_GOTO (this, err);
         VALIDATE_OR_GOTO (loc, err);
         VALIDATE_OR_GOTO (loc->inode, err);
-        VALIDATE_OR_GOTO (loc->path, err);
 
-        GF_IF_INTERNAL_XATTR_GOTO ("trusted.glusterfs.dht*", xattr,
+        conf   = this->private;
+
+        GF_IF_INTERNAL_XATTR_GOTO (conf->wild_xattr_name, xattr,
                                    op_errno, err);
 
-        conf   = this->private;
         local = dht_local_init (frame, loc, NULL, GF_FOP_SETXATTR);
         if (!local) {
                 op_errno = ENOMEM;
@@ -2448,25 +2510,6 @@ dht_setxattr (call_frame_t *frame, xlator_t *this,
 
         local->call_cnt = call_cnt = layout->cnt;
 
-        /*  This key is sent by Unified File and Object storage
-         *  to test xattr support in backend.
-         */
-        tmp = dict_get (xattr, "user.ufo-test");
-        if (tmp) {
-                if (IA_ISREG (loc->inode->ia_type)) {
-                        op_errno = ENOTSUP;
-                        goto err;
-                }
-                local->op_ret = 0;
-                for (i = 0; i < call_cnt; i++) {
-                        STACK_WIND (frame, dht_ufo_xattr_cbk,
-                                    layout->list[i].xlator,
-                                    layout->list[i].xlator->fops->setxattr,
-                                    loc, xattr, flags, NULL);
-                }
-                return 0;
-        }
-
         tmp = dict_get (xattr, "distribute.migrate-data");
         if (tmp) {
                 if (IA_ISDIR (loc->inode->ia_type)) {
@@ -2636,18 +2679,20 @@ dht_removexattr (call_frame_t *frame, xlator_t *this,
         dht_local_t  *local = NULL;
         dht_layout_t *layout = NULL;
         int           call_cnt = 0;
+        dht_conf_t   *conf = NULL;
 
         int i;
 
         VALIDATE_OR_GOTO (this, err);
+        VALIDATE_OR_GOTO (this->private, err);
 
-        GF_IF_NATIVE_XATTR_GOTO ("trusted.glusterfs.dht*",
-                                 key, op_errno, err);
+        conf = this->private;
+
+        GF_IF_NATIVE_XATTR_GOTO (conf->wild_xattr_name, key, op_errno, err);
 
         VALIDATE_OR_GOTO (frame, err);
         VALIDATE_OR_GOTO (loc, err);
         VALIDATE_OR_GOTO (loc->inode, err);
-        VALIDATE_OR_GOTO (loc->path, err);
 
         local = dht_local_init (frame, loc, NULL, GF_FOP_REMOVEXATTR);
         if (!local) {
@@ -2699,13 +2744,16 @@ dht_fremovexattr (call_frame_t *frame, xlator_t *this,
         dht_local_t  *local = NULL;
         dht_layout_t *layout = NULL;
         int           call_cnt = 0;
+        dht_conf_t   *conf = 0;
 
         int i;
 
         VALIDATE_OR_GOTO (this, err);
+        VALIDATE_OR_GOTO (this->private, err);
 
-        GF_IF_NATIVE_XATTR_GOTO ("trusted.glusterfs.dht*",
-                                 key, op_errno, err);
+        conf = this->private;
+
+        GF_IF_NATIVE_XATTR_GOTO (conf->wild_xattr_name, key, op_errno, err);
 
         VALIDATE_OR_GOTO (frame, err);
 
@@ -2876,7 +2924,6 @@ dht_statfs (call_frame_t *frame, xlator_t *this, loc_t *loc, dict_t *xdata)
         VALIDATE_OR_GOTO (this, err);
         VALIDATE_OR_GOTO (loc, err);
         VALIDATE_OR_GOTO (loc->inode, err);
-        VALIDATE_OR_GOTO (loc->path, err);
         VALIDATE_OR_GOTO (this->private, err);
 
         conf = this->private;
@@ -2996,10 +3043,13 @@ dht_readdirp_cbk (call_frame_t *frame, void *cookie, xlator_t *this, int op_ret,
 
         list_for_each_entry (orig_entry, (&orig_entries->list), list) {
                 next_offset = orig_entry->d_off;
-                if ((check_is_dir (NULL, (&orig_entry->d_stat), NULL) &&
-                     (prev->this != dht_first_up_subvol (this))) ||
-                    check_is_linkfile (NULL, (&orig_entry->d_stat),
-                                       orig_entry->dict)) {
+                if (check_is_dir (NULL, (&orig_entry->d_stat), NULL) &&
+                    (prev->this != local->first_up_subvol)) {
+                        continue;
+                }
+                if (check_is_linkfile (NULL, (&orig_entry->d_stat),
+                                       orig_entry->dict,
+                                       conf->link_xattr_name)) {
                         continue;
                 }
 
@@ -3076,13 +3126,16 @@ done:
                 }
 
 		if (conf->readdir_optimize == _gf_true) {
-                        if (next_subvol != dht_first_up_subvol (this)) {
+                        if (next_subvol != local->first_up_subvol) {
                                 ret = dict_set_int32 (local->xattr,
                                                       GF_READDIR_SKIP_DIRS, 1);
                                 if (ret)
                                         gf_log (this->name, GF_LOG_ERROR,
 					         "dict set failed");
-		        }
+		        } else {
+                                 dict_del (local->xattr,
+                                           GF_READDIR_SKIP_DIRS);
+                        }
                 }
 
                 STACK_WIND (frame, dht_readdirp_cbk,
@@ -3215,6 +3268,7 @@ dht_do_readdir (call_frame_t *frame, xlator_t *this, fd_t *fd, size_t size,
         VALIDATE_OR_GOTO (frame, err);
         VALIDATE_OR_GOTO (this, err);
         VALIDATE_OR_GOTO (fd, err);
+        VALIDATE_OR_GOTO (this->private, err);
 
         conf = this->private;
 
@@ -3227,6 +3281,7 @@ dht_do_readdir (call_frame_t *frame, xlator_t *this, fd_t *fd, size_t size,
         local->fd = fd_ref (fd);
         local->size = size;
         local->xattr_req = (dict)? dict_ref (dict) : NULL;
+        local->first_up_subvol = dht_first_up_subvol (this);
 
         dht_deitransform (this, yoff, &xvol, (uint64_t *)&xoff);
 
@@ -3239,20 +3294,22 @@ dht_do_readdir (call_frame_t *frame, xlator_t *this, fd_t *fd, size_t size,
 
                 if (local->xattr) {
                         ret = dict_set_uint32 (local->xattr,
-                                               "trusted.glusterfs.dht.linkto",
-                                               256);
+                                               conf->link_xattr_name, 256);
                         if (ret)
                                 gf_log (this->name, GF_LOG_WARNING,
-                                        "failed to set 'glusterfs.dht.linkto'"
-                                        " key");
+                                        "failed to set '%s' key",
+                                        conf->link_xattr_name);
 			if (conf->readdir_optimize == _gf_true) {
-                                if (xvol != dht_first_up_subvol (this)) {
+                                if (xvol != local->first_up_subvol) {
 				        ret = dict_set_int32 (local->xattr,
 			                               GF_READDIR_SKIP_DIRS, 1);
 				        if (ret)
 					        gf_log (this->name,
                                                         GF_LOG_ERROR,
 						        "Dict set failed");
+                                } else {
+                                        dict_del (local->xattr,
+                                                  GF_READDIR_SKIP_DIRS);
                                 }
 			}
                 }
@@ -3510,7 +3567,9 @@ dht_mknod (call_frame_t *frame, xlator_t *this,
                                    subvol, subvol->fops->mknod, loc, mode,
                                    rdev, umask, params);
         } else {
-                avail_subvol = dht_free_disk_available_subvol (this, subvol);
+
+                avail_subvol = dht_free_disk_available_subvol (this, subvol,
+                                                               local);
                 if (avail_subvol != subvol) {
                         /* Choose the minimum filled volume, and create the
                            files there */
@@ -3522,7 +3581,7 @@ dht_mknod (call_frame_t *frame, xlator_t *this,
                         local->umask = umask;
                         dht_linkfile_create (frame,
                                              dht_mknod_linkfile_create_cbk,
-                                             avail_subvol, subvol, loc);
+                                             this, avail_subvol, subvol, loc);
                 } else {
                         gf_log (this->name, GF_LOG_TRACE,
                                 "creating %s on %s", loc->path, subvol->name);
@@ -3781,7 +3840,7 @@ dht_link (call_frame_t *frame, xlator_t *this,
 
         if (hashed_subvol != cached_subvol) {
                 uuid_copy (local->gfid, oldloc->inode->gfid);
-                dht_linkfile_create (frame, dht_link_linkfile_cbk,
+                dht_linkfile_create (frame, dht_link_linkfile_cbk, this,
                                      cached_subvol, hashed_subvol, newloc);
         } else {
                 STACK_WIND (frame, dht_link_cbk,
@@ -3931,7 +3990,7 @@ dht_create (call_frame_t *frame, xlator_t *this,
         }
         /* Choose the minimum filled volume, and create the
            files there */
-        avail_subvol = dht_free_disk_available_subvol (this, subvol);
+        avail_subvol = dht_free_disk_available_subvol (this, subvol, local);
         if (avail_subvol != subvol) {
                 local->params = dict_ref (params);
                 local->flags = flags;
@@ -3942,9 +4001,8 @@ dht_create (call_frame_t *frame, xlator_t *this,
                 gf_log (this->name, GF_LOG_TRACE,
                         "creating %s on %s (link at %s)", loc->path,
                         avail_subvol->name, subvol->name);
-                dht_linkfile_create (frame,
-                                     dht_create_linkfile_create_cbk,
-                                     avail_subvol, subvol, loc);
+                dht_linkfile_create (frame, dht_create_linkfile_create_cbk,
+                                     this, avail_subvol, subvol, loc);
                 goto done;
         }
         gf_log (this->name, GF_LOG_TRACE,
@@ -4483,6 +4541,7 @@ dht_rmdir_lookup_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
         call_frame_t   *main_frame = NULL;
         dht_local_t    *main_local = NULL;
         int             this_call_cnt = 0;
+        dht_conf_t     *conf = this->private;
 
         local = frame->local;
         prev  = cookie;
@@ -4494,7 +4553,7 @@ dht_rmdir_lookup_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
         if (op_ret != 0)
                 goto err;
 
-        if (check_is_linkfile (inode, stbuf, xattr) == 0) {
+        if (!check_is_linkfile (inode, stbuf, xattr, conf->link_xattr_name)) {
                 main_local->op_ret  = -1;
                 main_local->op_errno = ENOTEMPTY;
 
@@ -4529,6 +4588,7 @@ dht_rmdir_is_subvol_empty (call_frame_t *frame, xlator_t *this,
         dht_local_t        *lookup_local = NULL;
         dht_local_t        *local = NULL;
         dict_t             *xattrs = NULL;
+        dht_conf_t         *conf = this->private;
 
         local = frame->local;
 
@@ -4537,7 +4597,8 @@ dht_rmdir_is_subvol_empty (call_frame_t *frame, xlator_t *this,
                         continue;
                 if (strcmp (trav->d_name, "..") == 0)
                         continue;
-                if (check_is_linkfile (NULL, (&trav->d_stat), trav->dict)) {
+                if (check_is_linkfile (NULL, (&trav->d_stat), trav->dict,
+                                              conf->link_xattr_name)) {
                         ret++;
                         continue;
                 }
@@ -4555,7 +4616,7 @@ dht_rmdir_is_subvol_empty (call_frame_t *frame, xlator_t *this,
                 return -1;
         }
 
-        ret = dict_set_uint32 (xattrs, DHT_LINKFILE_KEY, 256);
+        ret = dict_set_uint32 (xattrs, conf->link_xattr_name, 256);
         if (ret) {
                 gf_log (this->name, GF_LOG_ERROR, "failed to set linkto key"
                         " in dict");
@@ -4678,6 +4739,7 @@ dht_rmdir_opendir_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
         call_frame_t *prev = NULL;
         dict_t       *dict = NULL;
         int           ret = 0;
+        dht_conf_t   *conf = this->private;
 
         local = frame->local;
         prev  = cookie;
@@ -4701,12 +4763,11 @@ dht_rmdir_opendir_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                 goto err;
         }
 
-        ret = dict_set_uint32 (dict,
-                               "trusted.glusterfs.dht.linkto", 256);
+        ret = dict_set_uint32 (dict, conf->link_xattr_name, 256);
         if (ret)
                 gf_log (this->name, GF_LOG_WARNING,
-                        "%s: failed to set 'trusted.glusterfs.dht.linkto' key",
-                        local->loc.path);
+                        "%s: failed to set '%s' key",
+                        local->loc.path, conf->link_xattr_name);
 
         STACK_WIND (frame, dht_rmdir_readdirp_cbk,
                     prev->this, prev->this->fops->readdirp,
@@ -4805,7 +4866,6 @@ dht_entrylk (call_frame_t *frame, xlator_t *this,
         VALIDATE_OR_GOTO (this, err);
         VALIDATE_OR_GOTO (loc, err);
         VALIDATE_OR_GOTO (loc->inode, err);
-        VALIDATE_OR_GOTO (loc->path, err);
 
         local = dht_local_init (frame, loc, NULL, GF_FOP_ENTRYLK);
         if (!local) {
@@ -5113,8 +5173,8 @@ unlock:
                  * not need to handle CHILD_DOWN event here.
                  */
                 if (conf->defrag) {
-                        ret = pthread_create (&conf->defrag->th, NULL,
-                                              gf_defrag_start, this);
+                        ret = gf_thread_create (&conf->defrag->th, NULL,
+						gf_defrag_start, this);
                         if (ret) {
                                 conf->defrag = NULL;
                                 GF_FREE (conf->defrag);
diff --git a/xlators/cluster/dht/src/dht-common.h b/xlators/cluster/dht/src/dht-common.h
index 65983c0c4..5ccd66799 100644
--- a/xlators/cluster/dht/src/dht-common.h
+++ b/xlators/cluster/dht/src/dht-common.h
@@ -183,6 +183,7 @@ struct dht_local {
         xlator_t        *link_subvol;
 
         struct dht_rebalance_ rebalance;
+        xlator_t        *first_up_subvol;
 
 };
 typedef struct dht_local dht_local_t;
@@ -211,6 +212,10 @@ enum gf_defrag_status_t {
         GF_DEFRAG_STATUS_STOPPED,
         GF_DEFRAG_STATUS_COMPLETE,
         GF_DEFRAG_STATUS_FAILED,
+        GF_DEFRAG_STATUS_LAYOUT_FIX_STARTED,
+        GF_DEFRAG_STATUS_LAYOUT_FIX_STOPPED,
+        GF_DEFRAG_STATUS_LAYOUT_FIX_COMPLETE,
+        GF_DEFRAG_STATUS_LAYOUT_FIX_FAILED,
 };
 typedef enum gf_defrag_status_t gf_defrag_status_t;
 
@@ -227,6 +232,7 @@ struct gf_defrag_info_ {
         uint64_t                     total_data;
         uint64_t                     num_files_lookedup;
         uint64_t                     total_failures;
+        uint64_t                     skipped;
         gf_lock_t                    lock;
         int                          cmd;
         pthread_t                    th;
@@ -290,6 +296,11 @@ struct dht_conf {
         gf_boolean_t    rsync_regex_valid;
         regex_t         extra_regex;
         gf_boolean_t    extra_regex_valid;
+
+        /* Support variable xattr names. */
+        char            *xattr_name;
+        char            *link_xattr_name;
+        char            *wild_xattr_name;
 };
 typedef struct dht_conf dht_conf_t;
 
@@ -320,13 +331,12 @@ typedef enum {
 #define DHT_MIGRATION_IN_PROGRESS 1
 #define DHT_MIGRATION_COMPLETED   2
 
-#define DHT_LINKFILE_KEY         "trusted.glusterfs.dht.linkto"
 #define DHT_LINKFILE_MODE        (S_ISVTX)
 
-#define check_is_linkfile(i,s,x) (                                      \
+#define check_is_linkfile(i,s,x,n) (                                      \
                 ((st_mode_from_ia ((s)->ia_prot, (s)->ia_type) & ~S_IFMT) \
-                 == DHT_LINKFILE_MODE) &&                               \
-                dict_get (x, DHT_LINKFILE_KEY))
+                 == DHT_LINKFILE_MODE) &&                                 \
+                dict_get (x, n))
 
 #define IS_DHT_MIGRATION_PHASE2(buf)  (                                 \
                 IA_ISREG ((buf)->ia_type) &&                            \
@@ -433,12 +443,14 @@ int dht_iatt_merge (xlator_t                 *this, struct iatt *to, struct iatt
 xlator_t *dht_subvol_get_hashed (xlator_t *this, loc_t *loc);
 xlator_t *dht_subvol_get_cached (xlator_t *this, inode_t *inode);
 xlator_t *dht_subvol_next (xlator_t *this, xlator_t *prev);
+xlator_t *dht_subvol_next_available (xlator_t *this, xlator_t *prev);
 int       dht_subvol_cnt (xlator_t *this, xlator_t *subvol);
 
 int dht_hash_compute (xlator_t *this, int type, const char *name, uint32_t *hash_p);
 
 int dht_linkfile_create (call_frame_t    *frame, fop_mknod_cbk_t linkfile_cbk,
-                         xlator_t        *tovol, xlator_t *fromvol, loc_t *loc);
+                         xlator_t        *this, xlator_t *tovol,
+                         xlator_t        *fromvol, loc_t *loc);
 int                                       dht_lookup_directory (call_frame_t *frame, xlator_t *this, loc_t *loc);
 int                                       dht_lookup_everywhere (call_frame_t *frame, xlator_t *this, loc_t *loc);
 int
@@ -456,7 +468,8 @@ dht_layout_sort_volname (dht_layout_t *layout);
 int dht_get_du_info (call_frame_t *frame, xlator_t *this, loc_t *loc);
 
 gf_boolean_t dht_is_subvol_filled (xlator_t *this, xlator_t *subvol);
-xlator_t *dht_free_disk_available_subvol (xlator_t *this, xlator_t *subvol);
+xlator_t *dht_free_disk_available_subvol (xlator_t *this, xlator_t *subvol,
+                                          dht_local_t *layout);
 int       dht_get_du_info_for_subvol (xlator_t *this, int subvol_idx);
 
 int dht_layout_preset (xlator_t *this, xlator_t *subvol, inode_t *inode);
@@ -678,7 +691,16 @@ int32_t dht_setattr (call_frame_t  *frame, xlator_t *this, loc_t *loc,
                      struct iatt   *stbuf, int32_t valid, dict_t *xdata);
 int32_t dht_fsetattr (call_frame_t *frame, xlator_t *this, fd_t *fd,
                       struct iatt  *stbuf, int32_t valid, dict_t *xdata);
-
+int32_t dht_fallocate(call_frame_t *frame, xlator_t *this, fd_t *fd,
+		      int32_t mode, off_t offset, size_t len, dict_t *xdata);
+int32_t dht_discard(call_frame_t *frame, xlator_t *this, fd_t *fd,
+		    off_t offset, size_t len, dict_t *xdata);
+int32_t dht_zerofill(call_frame_t *frame, xlator_t *this, fd_t *fd,
+                    off_t offset, size_t len, dict_t *xdata);
+
+int32_t dht_init (xlator_t *this);
+void    dht_fini (xlator_t *this);
+int     dht_reconfigure (xlator_t *this, dict_t *options);
 int32_t dht_notify (xlator_t *this, int32_t event, void *data, ...);
 
 /* definitions for nufa/switch */
@@ -740,13 +762,26 @@ dht_dir_attr_heal (void *data);
 int
 dht_dir_attr_heal_done (int ret, call_frame_t *sync_frame, void *data);
 int
-dht_dir_has_layout (dict_t *xattr);
+dht_dir_has_layout (dict_t *xattr, char *name);
 gf_boolean_t
 dht_is_subvol_in_layout (dht_layout_t *layout, xlator_t *xlator);
 xlator_t *
-dht_subvol_with_free_space_inodes (xlator_t *this, xlator_t *subvol);
+dht_subvol_with_free_space_inodes (xlator_t *this, xlator_t *subvol,
+                                   dht_layout_t *layout);
 xlator_t *
-dht_subvol_maxspace_nonzeroinode (xlator_t *this, xlator_t *subvol);
+dht_subvol_maxspace_nonzeroinode (xlator_t *this, xlator_t *subvol,
+                                  dht_layout_t *layout);
 int
 dht_linkfile_attr_heal (call_frame_t *frame, xlator_t *this);
+
+void
+dht_layout_dump (dht_layout_t  *layout, const char *prefix);
+int32_t
+dht_priv_dump (xlator_t *this);
+int32_t
+dht_inodectx_dump (xlator_t *this, inode_t *inode);
+
+int
+dht_inode_ctx_get1 (xlator_t *this, inode_t *inode, xlator_t **subvol);
+
 #endif/* _DHT_H */
diff --git a/xlators/cluster/dht/src/dht-diskusage.c b/xlators/cluster/dht/src/dht-diskusage.c
index 0c87f4a64..fe3955ecb 100644
--- a/xlators/cluster/dht/src/dht-diskusage.c
+++ b/xlators/cluster/dht/src/dht-diskusage.c
@@ -251,25 +251,45 @@ dht_is_subvol_filled (xlator_t *this, xlator_t *subvol)
 
 /*Get the best subvolume to create the file in*/
 xlator_t *
-dht_free_disk_available_subvol (xlator_t *this, xlator_t *subvol)
+dht_free_disk_available_subvol (xlator_t *this, xlator_t *subvol,
+                                dht_local_t *local)
 {
 	xlator_t   *avail_subvol = NULL;
 	dht_conf_t *conf = NULL;
+        dht_layout_t *layout = NULL;
+        loc_t      *loc = NULL;
 
 	conf = this->private;
+        if (!local)
+                goto out;
+        loc = &local->loc;
+        if (!local->layout) {
+                layout = dht_layout_get (this, loc->parent);
+
+                if (!layout) {
+                        gf_log (this->name, GF_LOG_DEBUG,
+                                "layout missing path=%s parent=%s",
+                                loc->path, uuid_utoa (loc->parent->gfid));
+                        goto out;
+                }
+        } else {
+                layout = dht_layout_ref (this, local->layout);
+        }
 
-	LOCK (&conf->subvolume_lock);
+        LOCK (&conf->subvolume_lock);
 	{
-                avail_subvol = dht_subvol_with_free_space_inodes(this, subvol);
+                avail_subvol = dht_subvol_with_free_space_inodes(this, subvol,
+                                                                 layout);
                 if(!avail_subvol)
                 {
                         avail_subvol = dht_subvol_maxspace_nonzeroinode(this,
-                                                                        subvol);
+                                                                        subvol,
+                                                                        layout);
                 }
 
 	}
 	UNLOCK (&conf->subvolume_lock);
-
+out:
 	if (!avail_subvol) {
 		gf_log (this->name,
                         GF_LOG_DEBUG,
@@ -278,17 +298,42 @@ dht_free_disk_available_subvol (xlator_t *this, xlator_t *subvol)
                 avail_subvol = subvol;
 	}
 
-
+        if (layout)
+                dht_layout_unref (this, layout);
 	return avail_subvol;
 }
 
+static inline
+int32_t dht_subvol_has_err (xlator_t *this, dht_layout_t *layout)
+{
+        int ret = -1;
+        int i   = 0;
+
+        if (!this || !layout)
+                goto out;
+
+        /* check if subvol has layout errors, before selecting it */
+        for (i = 0; i < layout->cnt; i++) {
+                if (!strcmp (layout->list[i].xlator->name, this->name) &&
+                     (layout->list[i].err != 0)) {
+                        ret = -1;
+                        goto out;
+                }
+        }
+        ret = 0;
+out:
+        return ret;
+}
+
 /*Get subvolume which has both space and inodes more than the min criteria*/
 xlator_t *
-dht_subvol_with_free_space_inodes(xlator_t *this, xlator_t *subvol)
+dht_subvol_with_free_space_inodes(xlator_t *this, xlator_t *subvol,
+                                  dht_layout_t *layout)
 {
         int i = 0;
         double max = 0;
         double max_inodes = 0;
+        int    ignore_subvol = 0;
 
         xlator_t *avail_subvol = NULL;
         dht_conf_t *conf = NULL;
@@ -296,6 +341,12 @@ dht_subvol_with_free_space_inodes(xlator_t *this, xlator_t *subvol)
         conf = this->private;
 
         for(i=0; i < conf->subvolume_cnt; i++) {
+                /* check if subvol has layout errors, before selecting it */
+                ignore_subvol = dht_subvol_has_err (conf->subvolumes[i],
+                                                    layout);
+                if (ignore_subvol)
+                        continue;
+
                 if ((conf->disk_unit == 'p') &&
                     (conf->du_stats[i].avail_percent > conf->min_free_disk) &&
                     (conf->du_stats[i].avail_inodes  > conf->min_free_inodes)) {
@@ -325,10 +376,12 @@ dht_subvol_with_free_space_inodes(xlator_t *this, xlator_t *subvol)
 
 /* Get subvol which has atleast one inode and maximum space */
 xlator_t *
-dht_subvol_maxspace_nonzeroinode (xlator_t *this, xlator_t *subvol)
+dht_subvol_maxspace_nonzeroinode (xlator_t *this, xlator_t *subvol,
+                                  dht_layout_t *layout)
 {
         int         i = 0;
         double      max = 0;
+        int         ignore_subvol = 0;
 
         xlator_t   *avail_subvol = NULL;
         dht_conf_t *conf = NULL;
@@ -336,6 +389,12 @@ dht_subvol_maxspace_nonzeroinode (xlator_t *this, xlator_t *subvol)
         conf = this->private;
 
         for (i = 0; i < conf->subvolume_cnt; i++) {
+                /* check if subvol has layout errors, before selecting it */
+                ignore_subvol = dht_subvol_has_err (conf->subvolumes[i],
+                                                    layout);
+                if (ignore_subvol)
+                        continue;
+
                 if (conf->disk_unit == 'p') {
                         if ((conf->du_stats[i].avail_percent > max)
                             && (conf->du_stats[i].avail_inodes > 0 )) {
diff --git a/xlators/cluster/dht/src/dht-hashfn.c b/xlators/cluster/dht/src/dht-hashfn.c
index 519dbfbb2..656cf23a0 100644
--- a/xlators/cluster/dht/src/dht-hashfn.c
+++ b/xlators/cluster/dht/src/dht-hashfn.c
@@ -94,7 +94,7 @@ dht_hash_compute (xlator_t *this, int type, const char *name, uint32_t *hash_p)
         if (!munged && priv->rsync_regex_valid) {
                 len = strlen(name) + 1;
                 rsync_friendly_name = alloca(len);
-                gf_log (this->name, GF_LOG_DEBUG, "trying regex for %s", name);
+                gf_log (this->name, GF_LOG_TRACE, "trying regex for %s", name);
                 munged = dht_munge_name (name, rsync_friendly_name, len,
                                          &priv->rsync_regex);
                 if (munged) {
diff --git a/xlators/cluster/dht/src/dht-helper.c b/xlators/cluster/dht/src/dht-helper.c
index ecd06e394..311a48112 100644
--- a/xlators/cluster/dht/src/dht-helper.c
+++ b/xlators/cluster/dht/src/dht-helper.c
@@ -18,6 +18,28 @@
 #include "xlator.h"
 #include "dht-common.h"
 
+static inline int
+dht_inode_ctx_set1 (xlator_t *this, inode_t *inode, xlator_t *subvol)
+{
+        uint64_t tmp_subvol = 0;
+
+        tmp_subvol = (long)subvol;
+        return inode_ctx_set1 (inode, this, &tmp_subvol);
+}
+
+int
+dht_inode_ctx_get1 (xlator_t *this, inode_t *inode, xlator_t **subvol)
+{
+        int ret = -1;
+        uint64_t tmp_subvol = 0;
+
+        ret =  inode_ctx_get1 (inode, this, &tmp_subvol);
+        if (tmp_subvol && subvol)
+                *subvol = (xlator_t *)tmp_subvol;
+
+        return ret;
+}
+
 
 int
 dht_frame_return (call_frame_t *frame)
@@ -40,6 +62,43 @@ dht_frame_return (call_frame_t *frame)
 }
 
 
+static uint64_t
+dht_bits_for (uint64_t num)
+{
+	uint64_t bits = 0, ctrl = 1;
+
+	while (ctrl < num) {
+		ctrl *= 2;
+		bits ++;
+	}
+
+	return bits;
+}
+
+/*
+ * A slightly "updated" version of the algorithm described in the commit log
+ * is used here.
+ *
+ * The only enhancement is that:
+ *
+ * - The number of bits used by the backend filesystem for HUGE d_off which
+ *   is described as 63, and
+ * - The number of bits used by the d_off presented by the transformation
+ *   upwards which is described as 64, are both made "configurable."
+ */
+
+
+#define BACKEND_D_OFF_BITS 63
+#define PRESENT_D_OFF_BITS 63
+
+#define ONE 1ULL
+#define MASK (~0ULL)
+#define PRESENT_MASK (MASK >> (64 - PRESENT_D_OFF_BITS))
+#define BACKEND_MASK (MASK >> (64 - BACKEND_D_OFF_BITS))
+
+#define TOP_BIT (ONE << (PRESENT_D_OFF_BITS - 1))
+#define SHIFT_BITS (max (0, (BACKEND_D_OFF_BITS - PRESENT_D_OFF_BITS + 1)))
+
 int
 dht_itransform (xlator_t *this, xlator_t *subvol, uint64_t x, uint64_t *y_p)
 {
@@ -47,6 +106,9 @@ dht_itransform (xlator_t *this, xlator_t *subvol, uint64_t x, uint64_t *y_p)
         int         cnt = 0;
         int         max = 0;
         uint64_t    y = 0;
+        uint64_t    hi_mask = 0;
+        uint64_t    off_mask = 0;
+        int         max_bits = 0;
 
         if (x == ((uint64_t) -1)) {
                 y = (uint64_t) -1;
@@ -60,7 +122,23 @@ dht_itransform (xlator_t *this, xlator_t *subvol, uint64_t x, uint64_t *y_p)
         max = conf->subvolume_cnt;
         cnt = dht_subvol_cnt (this, subvol);
 
-        y = ((x * max) + cnt);
+	if (max == 1) {
+		y = x;
+		goto out;
+	}
+
+        max_bits = dht_bits_for (max);
+
+        hi_mask = ~(PRESENT_MASK >> (max_bits + 1));
+
+        if (x & hi_mask) {
+                /* HUGE d_off */
+                off_mask = MASK << max_bits;
+                y = TOP_BIT | ((x >> SHIFT_BITS) & off_mask) | cnt;
+        } else {
+                /* small d_off */
+                y = ((x * max) + cnt);
+        }
 
 out:
         if (y_p)
@@ -135,16 +213,38 @@ dht_deitransform (xlator_t *this, uint64_t y, xlator_t **subvol_p,
         int         max = 0;
         uint64_t    x = 0;
         xlator_t   *subvol = 0;
+        int         max_bits = 0;
+        uint64_t    off_mask = 0;
+        uint64_t    host_mask = 0;
 
         if (!this->private)
-                goto out;
+                return -1;
 
         conf = this->private;
         max = conf->subvolume_cnt;
 
-        cnt = y % max;
-        x   = y / max;
+	if (max == 1) {
+		x = y;
+		cnt = 0;
+		goto out;
+	}
+
+        if (y & TOP_BIT) {
+                /* HUGE d_off */
+                max_bits = dht_bits_for (max);
+                off_mask = (MASK << max_bits);
+                host_mask = ~(off_mask);
+
+                x = ((y & ~TOP_BIT) & off_mask) << SHIFT_BITS;
+
+                cnt = y & host_mask;
+	} else {
+                /* small d_off */
+                cnt = y % max;
+                x = y / max;
+        }
 
+out:
         subvol = conf->subvolumes[cnt];
 
         if (subvol_p)
@@ -153,7 +253,6 @@ dht_deitransform (xlator_t *this, uint64_t y, xlator_t **subvol_p,
         if (x_p)
                 *x_p = x;
 
-out:
         return 0;
 }
 
@@ -263,20 +362,6 @@ out:
         return local;
 }
 
-
-char *
-basestr (const char *str)
-{
-        char *basestr = NULL;
-
-        basestr = strrchr (str, '/');
-        if (basestr)
-                basestr ++;
-
-        return basestr;
-}
-
-
 xlator_t *
 dht_first_up_subvol (xlator_t *this)
 {
@@ -428,7 +513,36 @@ out:
         return next;
 }
 
+/* This func wraps around, if prev is actually the last subvol.
+ */
+xlator_t *
+dht_subvol_next_available (xlator_t *this, xlator_t *prev)
+{
+        dht_conf_t *conf = NULL;
+        int         i = 0;
+        xlator_t   *next = NULL;
+
+        conf = this->private;
+        if (!conf)
+                goto out;
+
+        for (i = 0; i < conf->subvolume_cnt; i++) {
+                if (conf->subvolumes[i] == prev) {
+                        /* if prev is last in conf->subvolumes, then wrap
+                         * around.
+                         */
+                        if ((i + 1) < conf->subvolume_cnt) {
+                                next = conf->subvolumes[i + 1];
+                        } else {
+                                next = conf->subvolumes[0];
+                        }
+                        break;
+                }
+        }
 
+out:
+        return next;
+}
 int
 dht_subvol_cnt (xlator_t *this, xlator_t *subvol)
 {
@@ -620,23 +734,36 @@ dht_migration_complete_check_task (void *data)
         call_frame_t *frame    = NULL;
         loc_t         tmp_loc  = {0,};
         char         *path     = NULL;
+        dht_conf_t   *conf     = NULL;
+        inode_t      *inode    = NULL;
+        fd_t         *iter_fd  = NULL;
+        uint64_t      tmp_subvol = 0;
+        int           open_failed = 0;
 
         this  = THIS;
         frame = data;
         local = frame->local;
+        conf = this->private;
 
         src_node = local->cached_subvol;
 
         if (!local->loc.inode && !local->fd)
                 goto out;
 
-        /* getxattr on cached_subvol for 'linkto' value */
-        if (!local->loc.inode)
+        inode = (!local->fd) ? local->loc.inode : local->fd->inode;
+
+        /* getxattr on cached_subvol for 'linkto' value. Do path based getxattr
+         * as root:root. If a fd is already open, access check wont be done*/
+
+        if (!local->loc.inode) {
                 ret = syncop_fgetxattr (src_node, local->fd, &dict,
-                                        DHT_LINKFILE_KEY);
-        else
+                                        conf->link_xattr_name);
+        } else {
+                SYNCTASK_SETID (0, 0);
                 ret = syncop_getxattr (src_node, &local->loc, &dict,
-                                       DHT_LINKFILE_KEY);
+                                       conf->link_xattr_name);
+                SYNCTASK_SETID (frame->root->uid, frame->root->gid);
+        }
 
         if (!ret)
                 dst_node = dht_linkfile_subvol (this, NULL, NULL, dict);
@@ -687,10 +814,7 @@ dht_migration_complete_check_task (void *data)
         /* update inode ctx (the layout) */
         dht_layout_unref (this, local->layout);
 
-        if (!local->loc.inode)
-                ret = dht_layout_preset (this, dst_node, local->fd->inode);
-        else
-                ret = dht_layout_preset (this, dst_node, local->loc.inode);
+        ret = dht_layout_preset (this, dst_node, inode);
         if (ret != 0) {
                 gf_log (this->name, GF_LOG_DEBUG,
                         "%s: could not set preset layout for subvol %s",
@@ -708,10 +832,7 @@ dht_migration_complete_check_task (void *data)
                 goto out;
         }
 
-        if (!local->loc.inode)
-                ret = dht_layout_set (this, local->fd->inode, layout);
-        else
-                ret = dht_layout_set (this, local->loc.inode, layout);
+        ret = dht_layout_set (this, inode, layout);
         if (ret) {
                 gf_log (this->name, GF_LOG_ERROR,
                         "%s: failed to set the new layout",
@@ -722,42 +843,46 @@ dht_migration_complete_check_task (void *data)
         local->cached_subvol = dst_node;
         ret = 0;
 
-        /* once we detect the migration complete, the fd-ctx is no more
-           required.. delete the ctx, and do one extra 'fd_unref' for open fd */
-        ret = fd_ctx_del (local->fd, this, NULL);
-        if (!ret) {
-                fd_unref (local->fd);
-                ret = 0;
+        /* once we detect the migration complete, the inode-ctx2 is no more
+           required.. delete the ctx and also, it means, open() already
+           done on all the fd of inode */
+        ret = inode_ctx_reset1 (inode, this, &tmp_subvol);
+        if (tmp_subvol)
+                goto out;
+
+        if (list_empty (&inode->fd_list))
                 goto out;
-        }
 
         /* perform open as root:root. There is window between linkfile
          * creation(root:root) and setattr with the correct uid/gid
          */
         SYNCTASK_SETID(0, 0);
-        /* if 'local->fd' (ie, fd based operation), send a 'open()' on
-           destination if not already done */
-        if (local->loc.inode) {
-                ret = syncop_open (dst_node, &local->loc,
-                                   local->fd->flags, local->fd);
-        } else {
-                tmp_loc.inode = local->fd->inode;
-                inode_path (local->fd->inode, NULL, &path);
-                if (path)
-                        tmp_loc.path = path;
-                ret = syncop_open (dst_node, &tmp_loc,
-                                   local->fd->flags, local->fd);
-                GF_FREE (path);
 
+        /* perform 'open()' on all the fd's present on the inode */
+        tmp_loc.inode = inode;
+        inode_path (inode, NULL, &path);
+        if (path)
+                tmp_loc.path = path;
+        list_for_each_entry (iter_fd, &inode->fd_list, inode_list) {
+                if (fd_is_anonymous (iter_fd))
+                        continue;
+
+                ret = syncop_open (dst_node, &tmp_loc,
+                                   iter_fd->flags, iter_fd);
+                if (ret == -1) {
+                        gf_log (this->name, GF_LOG_ERROR, "failed to open "
+                                "the fd (%p, flags=0%o) on file %s @ %s",
+                                iter_fd, iter_fd->flags, path, dst_node->name);
+                        open_failed = 1;
+                }
         }
+        GF_FREE (path);
+
         SYNCTASK_SETID (frame->root->uid, frame->root->gid);
-        if (ret == -1) {
-                gf_log (this->name, GF_LOG_ERROR,
-                        "%s: failed to send open() on target file at %s",
-                        local->loc.path, dst_node->name);
+        if (open_failed) {
+                ret = -1;
                 goto out;
         }
-
         ret = 0;
 out:
 
@@ -801,23 +926,34 @@ dht_rebalance_inprogress_task (void *data)
         char         *path     = NULL;
         struct iatt   stbuf    = {0,};
         loc_t         tmp_loc  = {0,};
+        dht_conf_t   *conf     = NULL;
+        inode_t      *inode    = NULL;
+        fd_t         *iter_fd  = NULL;
+        int           open_failed = 0;
 
         this  = THIS;
         frame = data;
         local = frame->local;
+        conf = this->private;
 
         src_node = local->cached_subvol;
 
         if (!local->loc.inode && !local->fd)
                 goto out;
 
-        /* getxattr on cached_subvol for 'linkto' value */
-        if (local->loc.inode)
+        inode = (!local->fd) ? local->loc.inode : local->fd->inode;
+
+        /* getxattr on cached_subvol for 'linkto' value. Do path based getxattr
+         * as root:root. If a fd is already open, access check wont be done*/
+        if (local->loc.inode) {
+                SYNCTASK_SETID (0, 0);
                 ret = syncop_getxattr (src_node, &local->loc, &dict,
-                                       DHT_LINKFILE_KEY);
-        else
+                                       conf->link_xattr_name);
+                SYNCTASK_SETID (frame->root->uid, frame->root->gid);
+        } else {
                 ret = syncop_fgetxattr (src_node, local->fd, &dict,
-                                        DHT_LINKFILE_KEY);
+                                        conf->link_xattr_name);
+        }
 
         if (ret) {
                 gf_log (this->name, GF_LOG_ERROR,
@@ -858,35 +994,47 @@ dht_rebalance_inprogress_task (void *data)
         }
 
         ret = 0;
+
+        if (list_empty (&inode->fd_list))
+                goto done;
+
         /* perform open as root:root. There is window between linkfile
          * creation(root:root) and setattr with the correct uid/gid
          */
         SYNCTASK_SETID (0, 0);
-        if (local->loc.inode) {
-                ret = syncop_open (dst_node, &local->loc,
-                                   local->fd->flags, local->fd);
-        } else {
-                tmp_loc.inode = local->fd->inode;
-                inode_path (local->fd->inode, NULL, &path);
-                if (path)
-                        tmp_loc.path = path;
+
+        tmp_loc.inode = inode;
+        inode_path (inode, NULL, &path);
+        if (path)
+                tmp_loc.path = path;
+
+        list_for_each_entry (iter_fd, &inode->fd_list, inode_list) {
+                if (fd_is_anonymous (iter_fd))
+                        continue;
+
                 ret = syncop_open (dst_node, &tmp_loc,
-                                   local->fd->flags, local->fd);
-                GF_FREE (path);
+                                   iter_fd->flags, iter_fd);
+                if (ret == -1) {
+                        gf_log (this->name, GF_LOG_ERROR, "failed to send open "
+                                "the fd (%p, flags=0%o) on file %s @ %s",
+                                iter_fd, iter_fd->flags, path, dst_node->name);
+                        open_failed = 1;
+                }
         }
+        GF_FREE (path);
 
-        if (ret == -1) {
-                gf_log (this->name, GF_LOG_ERROR,
-                        "%s: failed to send open() on target file at %s",
-                        local->loc.path, dst_node->name);
+        SYNCTASK_SETID (frame->root->uid, frame->root->gid);
+
+        if (open_failed) {
+                ret = -1;
                 goto out;
         }
 
-        SYNCTASK_SETID (frame->root->uid, frame->root->gid);
-        ret = fd_ctx_set (local->fd, this, (uint64_t)(long)dst_node);
+done:
+        ret = dht_inode_ctx_set1 (this, inode, dst_node);
         if (ret) {
                 gf_log (this->name, GF_LOG_ERROR,
-                        "%s: failed to set fd-ctx target file at %s",
+                        "%s: failed to set inode-ctx target file at %s",
                         local->loc.path, dst_node->name);
                 goto out;
         }
diff --git a/xlators/cluster/dht/src/dht-inode-read.c b/xlators/cluster/dht/src/dht-inode-read.c
index f17cb73b9..ece84151a 100644
--- a/xlators/cluster/dht/src/dht-inode-read.c
+++ b/xlators/cluster/dht/src/dht-inode-read.c
@@ -130,10 +130,11 @@ int
 dht_file_attr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                    int op_ret, int op_errno, struct iatt *stbuf, dict_t *xdata)
 {
-        uint64_t      tmp_subvol = 0;
+        xlator_t     *subvol = 0;
         dht_local_t  *local = NULL;
         call_frame_t *prev = NULL;
         int           ret = -1;
+        inode_t      *inode = NULL;
 
         GF_VALIDATE_OR_GOTO ("dht", frame, err);
         GF_VALIDATE_OR_GOTO ("dht", this, out);
@@ -154,21 +155,23 @@ dht_file_attr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
         if (local->call_cnt != 1)
                 goto out;
 
+        local->op_errno = op_errno;
         /* Check if the rebalance phase2 is true */
         if ((op_ret == -1) || IS_DHT_MIGRATION_PHASE2 (stbuf)) {
-                if (local->fd)
-                        ret = fd_ctx_get (local->fd, this, &tmp_subvol);
-                if (ret) {
+                inode = (local->fd) ? local->fd->inode : local->loc.inode;
+                ret = dht_inode_ctx_get1 (this, inode, &subvol);
+                if (!subvol) {
                         /* Phase 2 of migration */
                         local->rebalance.target_op_fn = dht_attr2;
                         ret = dht_rebalance_complete_check (this, frame);
+                        if (!ret)
+                                return 0;
                 } else {
                         /* value is already set in fd_ctx, that means no need
                            to check for whether its complete or not. */
                         dht_attr2 (this, frame, 0);
-                }
-                if (!ret)
                         return 0;
+                }
         }
 
 out:
@@ -381,6 +384,8 @@ dht_readv_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
 {
         dht_local_t *local      = NULL;
         int          ret        = 0;
+        inode_t     *inode      = NULL;
+        xlator_t    *subvol = 0;
 
         local = frame->local;
         if (!local) {
@@ -396,19 +401,21 @@ dht_readv_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
         if ((op_ret == -1) && (op_errno != ENOENT))
                 goto out;
 
+        local->op_errno = op_errno;
         if ((op_ret == -1) || IS_DHT_MIGRATION_PHASE2 (stbuf)) {
                 /* File would be migrated to other node */
-                ret = fd_ctx_get (local->fd, this, NULL);
-                if (ret) {
+                ret = dht_inode_ctx_get1 (this, inode, &subvol);
+                if (!subvol) {
                         local->rebalance.target_op_fn = dht_readv2;
                         ret = dht_rebalance_complete_check (this, frame);
+                        if (!ret)
+                                return 0;
                 } else {
                         /* value is already set in fd_ctx, that means no need
                            to check for whether its complete or not. */
                         dht_readv2 (this, frame, 0);
-                }
-                if (!ret)
                         return 0;
+                }
         }
 
 out:
@@ -499,24 +506,34 @@ dht_access_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
         int          ret = -1;
         dht_local_t *local = NULL;
         xlator_t    *subvol = NULL;
+        call_frame_t *prev = NULL;
 
         local = frame->local;
+        prev = cookie;
 
+        if (!prev || !prev->this)
+                goto out;
         if (local->call_cnt != 1)
                 goto out;
         if ((op_ret == -1) && (op_errno == ENOTCONN) &&
             IA_ISDIR(local->loc.inode->ia_type)) {
 
-                subvol = dht_first_up_subvol (this);
+                subvol = dht_subvol_next_available (this, prev->this);
                 if (!subvol)
                         goto out;
 
+                /* check if we are done with visiting every node */
+                if (subvol == local->cached_subvol) {
+                        goto out;
+                }
+
                 STACK_WIND (frame, dht_access_cbk, subvol, subvol->fops->access,
                             &local->loc, local->rebalance.flags, NULL);
                 return 0;
         }
         if ((op_ret == -1) && (op_errno == ENOENT)) {
                 /* File would be migrated to other node */
+                local->op_errno = op_errno;
                 local->rebalance.target_op_fn = dht_access2;
                 ret = dht_rebalance_complete_check (frame->this, frame);
                 if (!ret)
@@ -604,8 +621,9 @@ int
 dht_flush_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                int op_ret, int op_errno, dict_t *xdata)
 {
-        dht_local_t  *local = NULL;
-        int           ret = -1;
+        dht_local_t  *local  = NULL;
+        inode_t      *inode  = NULL;
+        xlator_t     *subvol = 0;
 
         local = frame->local;
 
@@ -615,8 +633,8 @@ dht_flush_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                 goto out;
 
         /* If context is set, then send flush() it to the destination */
-        ret = fd_ctx_get (local->fd, this, NULL);
-        if (!ret) {
+        dht_inode_ctx_get1 (this, inode, &subvol);
+        if (subvol) {
                 dht_flush2 (this, frame, 0);
                 return 0;
         }
@@ -632,14 +650,10 @@ dht_flush2 (xlator_t *this, call_frame_t *frame, int op_ret)
 {
         dht_local_t  *local  = NULL;
         xlator_t     *subvol = NULL;
-        uint64_t      tmp_subvol = 0;
-        int           ret = -1;
 
         local = frame->local;
 
-        ret = fd_ctx_get (local->fd, this, &tmp_subvol);
-        if (!ret)
-                subvol = (xlator_t *)(long)tmp_subvol;
+        dht_inode_ctx_get1 (this, local->fd->inode, &subvol);
 
         if (!subvol)
                 subvol = local->cached_subvol;
@@ -701,12 +715,14 @@ dht_fsync_cbk (call_frame_t *frame, void *cookie, xlator_t *this, int op_ret,
         dht_local_t  *local = NULL;
         call_frame_t *prev = NULL;
         int           ret = -1;
+        inode_t      *inode = NULL;
+        xlator_t     *subvol = 0;
 
         local = frame->local;
         prev = cookie;
 
         local->op_errno = op_errno;
-        if (op_ret == -1) {
+        if (op_ret == -1 && (op_errno != ENOENT)) {
                 gf_log (this->name, GF_LOG_DEBUG,
                         "subvolume %s returned -1 (%s)",
                         prev->this->name, strerror (op_errno));
@@ -721,8 +737,9 @@ dht_fsync_cbk (call_frame_t *frame, void *cookie, xlator_t *this, int op_ret,
                 goto out;
         }
 
-        ret = fd_ctx_get (local->fd, this, NULL);
-        if (ret) {
+        local->op_errno = op_errno;
+        dht_inode_ctx_get1 (this, inode, &subvol);
+        if (!subvol) {
                 local->rebalance.target_op_fn = dht_fsync2;
 
                 /* Check if the rebalance phase1 is true */
@@ -737,11 +754,12 @@ dht_fsync_cbk (call_frame_t *frame, void *cookie, xlator_t *this, int op_ret,
                 if (IS_DHT_MIGRATION_PHASE2 (postbuf)) {
                         ret = dht_rebalance_complete_check (this, frame);
                 }
+                if (!ret)
+                        return 0;
         } else {
                 dht_fsync2 (this, frame, 0);
-        }
-        if (!ret)
                 return 0;
+        }
 
 out:
         DHT_STRIP_PHASE1_FLAGS (postbuf);
@@ -757,15 +775,10 @@ dht_fsync2 (xlator_t *this, call_frame_t *frame, int op_ret)
 {
         dht_local_t  *local  = NULL;
         xlator_t     *subvol = NULL;
-        uint64_t      tmp_subvol = 0;
-        int           ret = -1;
 
         local = frame->local;
 
-        ret = fd_ctx_get (local->fd, this, &tmp_subvol);
-        if (!ret)
-                subvol = (xlator_t *)(long)tmp_subvol;
-
+        dht_inode_ctx_get1 (this, local->fd->inode, &subvol);
         if (!subvol)
                 subvol = local->cached_subvol;
 
diff --git a/xlators/cluster/dht/src/dht-inode-write.c b/xlators/cluster/dht/src/dht-inode-write.c
index d4a3ecc39..4b3f3a049 100644
--- a/xlators/cluster/dht/src/dht-inode-write.c
+++ b/xlators/cluster/dht/src/dht-inode-write.c
@@ -19,6 +19,9 @@
 int dht_writev2 (xlator_t *this, call_frame_t *frame, int ret);
 int dht_truncate2 (xlator_t *this, call_frame_t *frame, int ret);
 int dht_setattr2 (xlator_t *this, call_frame_t *frame, int ret);
+int dht_fallocate2(xlator_t *this, call_frame_t *frame, int op_ret);
+int dht_discard2(xlator_t *this, call_frame_t *frame, int op_ret);
+int dht_zerofill2(xlator_t *this, call_frame_t *frame, int op_ret);
 
 int
 dht_writev_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
@@ -27,8 +30,9 @@ dht_writev_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
 {
         dht_local_t *local = NULL;
         int          ret   = -1;
+        xlator_t    *subvol = NULL;
 
-        if (op_ret == -1) {
+        if (op_ret == -1 && (op_errno != ENOENT)) {
                 goto out;
         }
 
@@ -50,6 +54,7 @@ dht_writev_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
 
         local->rebalance.target_op_fn = dht_writev2;
 
+        local->op_errno = op_errno;
         /* Phase 2 of migration */
         if (IS_DHT_MIGRATION_PHASE2 (postbuf)) {
                 ret = dht_rebalance_complete_check (this, frame);
@@ -62,8 +67,8 @@ dht_writev_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                 dht_iatt_merge (this, &local->stbuf, postbuf, NULL);
                 dht_iatt_merge (this, &local->prebuf, prebuf, NULL);
 
-                ret = fd_ctx_get (local->fd, this, NULL);
-                if (!ret) {
+                ret = dht_inode_ctx_get1 (this, local->fd->inode, &subvol);
+                if (subvol) {
                         dht_writev2 (this, frame, 0);
                         return 0;
                 }
@@ -87,14 +92,10 @@ dht_writev2 (xlator_t *this, call_frame_t *frame, int op_ret)
 {
         dht_local_t  *local  = NULL;
         xlator_t     *subvol = NULL;
-        uint64_t      tmp_subvol = 0;
-        int           ret = -1;
 
         local = frame->local;
 
-        ret = fd_ctx_get (local->fd, this, &tmp_subvol);
-        if (!ret)
-                subvol = (xlator_t *)(long)tmp_subvol;
+        dht_inode_ctx_get1 (this, local->fd->inode, &subvol);
 
         if (!subvol)
                 subvol = local->cached_subvol;
@@ -169,6 +170,8 @@ dht_truncate_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
         dht_local_t  *local = NULL;
         call_frame_t *prev = NULL;
         int           ret = -1;
+        xlator_t    *subvol = NULL;
+        inode_t      *inode = NULL;
 
         GF_VALIDATE_OR_GOTO ("dht", frame, err);
         GF_VALIDATE_OR_GOTO ("dht", this, out);
@@ -198,6 +201,7 @@ dht_truncate_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
 
         local->rebalance.target_op_fn = dht_truncate2;
 
+        local->op_errno = op_errno;
         /* Phase 2 of migration */
         if ((op_ret == -1) || IS_DHT_MIGRATION_PHASE2 (postbuf)) {
                 ret = dht_rebalance_complete_check (this, frame);
@@ -209,8 +213,9 @@ dht_truncate_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
         if (IS_DHT_MIGRATION_PHASE1 (postbuf)) {
                 dht_iatt_merge (this, &local->stbuf, postbuf, NULL);
                 dht_iatt_merge (this, &local->prebuf, prebuf, NULL);
-                ret = fd_ctx_get (local->fd, this, NULL);
-                if (!ret) {
+                inode = (local->fd) ? local->fd->inode : local->loc.inode;
+                dht_inode_ctx_get1 (this, inode, &subvol);
+                if (subvol) {
                         dht_truncate2 (this, frame, 0);
                         return 0;
                 }
@@ -234,16 +239,13 @@ dht_truncate2 (xlator_t *this, call_frame_t *frame, int op_ret)
 {
         dht_local_t  *local  = NULL;
         xlator_t     *subvol = NULL;
-        uint64_t      tmp_subvol = 0;
-        int           ret = -1;
+        inode_t      *inode = NULL;
 
         local = frame->local;
 
-        if (local->fd)
-                ret = fd_ctx_get (local->fd, this, &tmp_subvol);
-        if (!ret)
-                subvol = (xlator_t *)(long)tmp_subvol;
+        inode = local->fd ? local->fd->inode : local->loc.inode;
 
+        dht_inode_ctx_get1 (this, inode, &subvol);
         if (!subvol)
                 subvol = local->cached_subvol;
 
@@ -346,6 +348,407 @@ err:
         return 0;
 }
 
+
+int
+dht_fallocate_cbk(call_frame_t *frame, void *cookie, xlator_t *this,
+                  int op_ret, int op_errno, struct iatt *prebuf,
+                  struct iatt *postbuf, dict_t *xdata)
+{
+        dht_local_t  *local = NULL;
+        call_frame_t *prev = NULL;
+        int           ret = -1;
+        xlator_t    *subvol = NULL;
+
+        GF_VALIDATE_OR_GOTO ("dht", frame, err);
+        GF_VALIDATE_OR_GOTO ("dht", this, out);
+        GF_VALIDATE_OR_GOTO ("dht", frame->local, out);
+        GF_VALIDATE_OR_GOTO ("dht", cookie, out);
+
+        local = frame->local;
+        prev = cookie;
+
+        if ((op_ret == -1) && (op_errno != ENOENT)) {
+                local->op_errno = op_errno;
+                local->op_ret = -1;
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "subvolume %s returned -1 (%s)",
+                        prev->this->name, strerror (op_errno));
+
+                goto out;
+        }
+
+        if (local->call_cnt != 1) {
+                if (local->stbuf.ia_blocks) {
+                        dht_iatt_merge (this, postbuf, &local->stbuf, NULL);
+                        dht_iatt_merge (this, prebuf, &local->prebuf, NULL);
+                }
+                goto out;
+        }
+        local->rebalance.target_op_fn = dht_fallocate2;
+
+        /* Phase 2 of migration */
+        if ((op_ret == -1) || IS_DHT_MIGRATION_PHASE2 (postbuf)) {
+                ret = dht_rebalance_complete_check (this, frame);
+                if (!ret)
+                        return 0;
+        }
+
+        /* Check if the rebalance phase1 is true */
+        if (IS_DHT_MIGRATION_PHASE1 (postbuf)) {
+                dht_iatt_merge (this, &local->stbuf, postbuf, NULL);
+                dht_iatt_merge (this, &local->prebuf, prebuf, NULL);
+                dht_inode_ctx_get1 (this, local->fd->inode, &subvol);
+                if (subvol) {
+                        dht_fallocate2 (this, frame, 0);
+                        return 0;
+                }
+                ret = dht_rebalance_in_progress_check (this, frame);
+                if (!ret)
+                        return 0;
+        }
+
+out:
+        DHT_STRIP_PHASE1_FLAGS (postbuf);
+        DHT_STRIP_PHASE1_FLAGS (prebuf);
+        DHT_STACK_UNWIND (fallocate, frame, op_ret, op_errno,
+                          prebuf, postbuf, xdata);
+err:
+        return 0;
+}
+
+int
+dht_fallocate2(xlator_t *this, call_frame_t *frame, int op_ret)
+{
+        dht_local_t  *local  = NULL;
+        xlator_t     *subvol = NULL;
+
+        local = frame->local;
+
+        dht_inode_ctx_get1 (this, local->fd->inode, &subvol);
+
+        if (!subvol)
+                subvol = local->cached_subvol;
+
+        local->call_cnt = 2; /* This is the second attempt */
+
+	STACK_WIND(frame, dht_fallocate_cbk, subvol, subvol->fops->fallocate,
+		   local->fd, local->rebalance.flags, local->rebalance.offset,
+		   local->rebalance.size, NULL);
+
+        return 0;
+}
+
+int
+dht_fallocate(call_frame_t *frame, xlator_t *this, fd_t *fd, int32_t mode,
+	      off_t offset, size_t len, dict_t *xdata)
+{
+        xlator_t     *subvol = NULL;
+        int           op_errno = -1;
+        dht_local_t  *local = NULL;
+
+        VALIDATE_OR_GOTO (frame, err);
+        VALIDATE_OR_GOTO (this, err);
+        VALIDATE_OR_GOTO (fd, err);
+
+        local = dht_local_init (frame, NULL, fd, GF_FOP_FALLOCATE);
+        if (!local) {
+                op_errno = ENOMEM;
+                goto err;
+        }
+
+	local->rebalance.flags = mode;
+        local->rebalance.offset = offset;
+	local->rebalance.size = len;
+
+        local->call_cnt = 1;
+        subvol = local->cached_subvol;
+        if (!subvol) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "no cached subvolume for fd=%p", fd);
+                op_errno = EINVAL;
+                goto err;
+        }
+
+        STACK_WIND (frame, dht_fallocate_cbk,
+                    subvol, subvol->fops->fallocate,
+                    fd, mode, offset, len, xdata);
+
+        return 0;
+
+err:
+        op_errno = (op_errno == -1) ? errno : op_errno;
+        DHT_STACK_UNWIND (fallocate, frame, -1, op_errno, NULL, NULL, NULL);
+
+        return 0;
+}
+
+
+int
+dht_discard_cbk(call_frame_t *frame, void *cookie, xlator_t *this,
+                int op_ret, int op_errno, struct iatt *prebuf,
+                struct iatt *postbuf, dict_t *xdata)
+{
+        dht_local_t  *local = NULL;
+        call_frame_t *prev = NULL;
+        int           ret = -1;
+        xlator_t    *subvol = NULL;
+
+        GF_VALIDATE_OR_GOTO ("dht", frame, err);
+        GF_VALIDATE_OR_GOTO ("dht", this, out);
+        GF_VALIDATE_OR_GOTO ("dht", frame->local, out);
+        GF_VALIDATE_OR_GOTO ("dht", cookie, out);
+
+        local = frame->local;
+        prev = cookie;
+
+        if ((op_ret == -1) && (op_errno != ENOENT)) {
+                local->op_errno = op_errno;
+                local->op_ret = -1;
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "subvolume %s returned -1 (%s)",
+                        prev->this->name, strerror (op_errno));
+
+                goto out;
+        }
+
+        if (local->call_cnt != 1) {
+                if (local->stbuf.ia_blocks) {
+                        dht_iatt_merge (this, postbuf, &local->stbuf, NULL);
+                        dht_iatt_merge (this, prebuf, &local->prebuf, NULL);
+                }
+                goto out;
+        }
+        local->rebalance.target_op_fn = dht_discard2;
+
+        /* Phase 2 of migration */
+        if ((op_ret == -1) || IS_DHT_MIGRATION_PHASE2 (postbuf)) {
+                ret = dht_rebalance_complete_check (this, frame);
+                if (!ret)
+                        return 0;
+        }
+
+        /* Check if the rebalance phase1 is true */
+        if (IS_DHT_MIGRATION_PHASE1 (postbuf)) {
+                dht_iatt_merge (this, &local->stbuf, postbuf, NULL);
+                dht_iatt_merge (this, &local->prebuf, prebuf, NULL);
+                dht_inode_ctx_get1 (this, local->fd->inode, &subvol);
+                if (subvol) {
+                        dht_discard2 (this, frame, 0);
+                        return 0;
+                }
+                ret = dht_rebalance_in_progress_check (this, frame);
+                if (!ret)
+                        return 0;
+        }
+
+out:
+        DHT_STRIP_PHASE1_FLAGS (postbuf);
+        DHT_STRIP_PHASE1_FLAGS (prebuf);
+        DHT_STACK_UNWIND (discard, frame, op_ret, op_errno,
+                          prebuf, postbuf, xdata);
+err:
+        return 0;
+}
+
+int
+dht_discard2(xlator_t *this, call_frame_t *frame, int op_ret)
+{
+        dht_local_t  *local  = NULL;
+        xlator_t     *subvol = NULL;
+
+        local = frame->local;
+
+        dht_inode_ctx_get1 (this, local->fd->inode, &subvol);
+
+        if (!subvol)
+                subvol = local->cached_subvol;
+
+        local->call_cnt = 2; /* This is the second attempt */
+
+	STACK_WIND(frame, dht_discard_cbk, subvol, subvol->fops->discard,
+		   local->fd, local->rebalance.offset, local->rebalance.size,
+		   NULL);
+
+        return 0;
+}
+
+int
+dht_discard(call_frame_t *frame, xlator_t *this, fd_t *fd, off_t offset,
+	    size_t len, dict_t *xdata)
+{
+        xlator_t     *subvol = NULL;
+        int           op_errno = -1;
+        dht_local_t  *local = NULL;
+
+        VALIDATE_OR_GOTO (frame, err);
+        VALIDATE_OR_GOTO (this, err);
+        VALIDATE_OR_GOTO (fd, err);
+
+        local = dht_local_init (frame, NULL, fd, GF_FOP_DISCARD);
+        if (!local) {
+                op_errno = ENOMEM;
+                goto err;
+        }
+
+        local->rebalance.offset = offset;
+	local->rebalance.size = len;
+
+        local->call_cnt = 1;
+        subvol = local->cached_subvol;
+        if (!subvol) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "no cached subvolume for fd=%p", fd);
+                op_errno = EINVAL;
+                goto err;
+        }
+
+        STACK_WIND (frame, dht_discard_cbk, subvol, subvol->fops->discard,
+                    fd, offset, len, xdata);
+
+        return 0;
+
+err:
+        op_errno = (op_errno == -1) ? errno : op_errno;
+        DHT_STACK_UNWIND (discard, frame, -1, op_errno, NULL, NULL, NULL);
+
+        return 0;
+}
+
+int
+dht_zerofill_cbk(call_frame_t *frame, void *cookie, xlator_t *this,
+                int op_ret, int op_errno, struct iatt *prebuf,
+                struct iatt *postbuf, dict_t *xdata)
+{
+        dht_local_t  *local = NULL;
+        call_frame_t *prev  = NULL;
+        int           ret   = -1;
+
+        GF_VALIDATE_OR_GOTO ("dht", frame, err);
+        GF_VALIDATE_OR_GOTO ("dht", this, out);
+        GF_VALIDATE_OR_GOTO ("dht", frame->local, out);
+        GF_VALIDATE_OR_GOTO ("dht", cookie, out);
+
+        local = frame->local;
+        prev = cookie;
+
+        if ((op_ret == -1) && (op_errno != ENOENT)) {
+                local->op_errno = op_errno;
+                local->op_ret = -1;
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "subvolume %s returned -1 (%s)",
+                        prev->this->name, strerror (op_errno));
+                goto out;
+        }
+
+        if (local->call_cnt != 1) {
+                if (local->stbuf.ia_blocks) {
+                        dht_iatt_merge (this, postbuf, &local->stbuf, NULL);
+                        dht_iatt_merge (this, prebuf, &local->prebuf, NULL);
+                }
+                goto out;
+        }
+        local->rebalance.target_op_fn = dht_zerofill2;
+        /* Phase 2 of migration */
+        if ((op_ret == -1) || IS_DHT_MIGRATION_PHASE2 (postbuf)) {
+                ret = dht_rebalance_complete_check (this, frame);
+                if (!ret)
+                        return 0;
+        }
+
+        /* Check if the rebalance phase1 is true */
+        if (IS_DHT_MIGRATION_PHASE1 (postbuf)) {
+                dht_iatt_merge (this, &local->stbuf, postbuf, NULL);
+                dht_iatt_merge (this, &local->prebuf, prebuf, NULL);
+                ret = fd_ctx_get (local->fd, this, NULL);
+                if (!ret) {
+                        dht_zerofill2 (this, frame, 0);
+                        return 0;
+                }
+                ret = dht_rebalance_in_progress_check (this, frame);
+                if (!ret)
+                        return 0;
+        }
+
+out:
+        DHT_STRIP_PHASE1_FLAGS (postbuf);
+        DHT_STRIP_PHASE1_FLAGS (prebuf);
+        DHT_STACK_UNWIND (zerofill, frame, op_ret, op_errno,
+                          prebuf, postbuf, xdata);
+err:
+        return 0;
+}
+
+int
+dht_zerofill2(xlator_t *this, call_frame_t *frame, int op_ret)
+{
+        dht_local_t  *local          = NULL;
+        xlator_t     *subvol         = NULL;
+        uint64_t      tmp_subvol     = 0;
+        int           ret            = -1;
+
+        local = frame->local;
+
+        if (local->fd)
+                ret = fd_ctx_get (local->fd, this, &tmp_subvol);
+        if (!ret)
+                subvol = (xlator_t *)(long)tmp_subvol;
+
+        if (!subvol)
+                subvol = local->cached_subvol;
+
+        local->call_cnt = 2; /* This is the second attempt */
+
+        STACK_WIND(frame, dht_zerofill_cbk, subvol, subvol->fops->zerofill,
+                   local->fd, local->rebalance.offset, local->rebalance.size,
+                   NULL);
+
+        return 0;
+}
+
+int
+dht_zerofill(call_frame_t *frame, xlator_t *this, fd_t *fd, off_t offset,
+            size_t len, dict_t *xdata)
+{
+        xlator_t     *subvol       = NULL;
+        int           op_errno     = -1;
+        dht_local_t  *local        = NULL;
+
+        VALIDATE_OR_GOTO (frame, err);
+        VALIDATE_OR_GOTO (this, err);
+        VALIDATE_OR_GOTO (fd, err);
+
+        local = dht_local_init (frame, NULL, fd, GF_FOP_ZEROFILL);
+        if (!local) {
+                op_errno = ENOMEM;
+                goto err;
+        }
+
+        local->rebalance.offset = offset;
+        local->rebalance.size = len;
+
+        local->call_cnt = 1;
+        subvol = local->cached_subvol;
+        if (!subvol) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "no cached subvolume for fd=%p", fd);
+                op_errno = EINVAL;
+                goto err;
+        }
+
+        STACK_WIND (frame, dht_zerofill_cbk, subvol, subvol->fops->zerofill,
+                    fd, offset, len, xdata);
+
+        return 0;
+
+err:
+        op_errno = (op_errno == -1) ? errno : op_errno;
+        DHT_STACK_UNWIND (zerofill, frame, -1, op_errno, NULL, NULL, NULL);
+
+        return 0;
+}
+
+
+
 /* handle cases of migration here for 'setattr()' calls */
 int
 dht_file_setattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
@@ -397,15 +800,13 @@ dht_setattr2 (xlator_t *this, call_frame_t *frame, int op_ret)
 {
         dht_local_t  *local  = NULL;
         xlator_t     *subvol = NULL;
-        uint64_t      tmp_subvol = 0;
-        int           ret = -1;
+        inode_t      *inode = NULL;
 
         local = frame->local;
 
-        if (local->fd)
-                ret = fd_ctx_get (local->fd, this, &tmp_subvol);
-        if (!ret)
-                subvol = (xlator_t *)(long)tmp_subvol;
+        inode = (local->fd) ? local->fd->inode : local->loc.inode;
+
+        dht_inode_ctx_get1 (this, inode, &subvol);
 
         if (!subvol)
                 subvol = local->cached_subvol;
diff --git a/xlators/cluster/dht/src/dht-layout.c b/xlators/cluster/dht/src/dht-layout.c
index 71aa1b70c..38e9970a7 100644
--- a/xlators/cluster/dht/src/dht-layout.c
+++ b/xlators/cluster/dht/src/dht-layout.c
@@ -335,11 +335,12 @@ int
 dht_layout_merge (xlator_t *this, dht_layout_t *layout, xlator_t *subvol,
                   int op_ret, int op_errno, dict_t *xattr)
 {
-        int      i     = 0;
-        int      ret   = -1;
-        int      err   = -1;
-        void    *disk_layout_raw = NULL;
-        int      disk_layout_len = 0;
+        int         i     = 0;
+        int         ret   = -1;
+        int         err   = -1;
+        void       *disk_layout_raw = NULL;
+        int         disk_layout_len = 0;
+        dht_conf_t *conf = this->private;
 
         if (op_ret != 0) {
                 err = op_errno;
@@ -360,12 +361,12 @@ dht_layout_merge (xlator_t *this, dht_layout_t *layout, xlator_t *subvol,
 
         if (xattr) {
                 /* during lookup and not mkdir */
-                ret = dict_get_ptr_and_len (xattr, "trusted.glusterfs.dht",
+                ret = dict_get_ptr_and_len (xattr, conf->xattr_name,
 					    &disk_layout_raw, &disk_layout_len);
         }
 
         if (ret != 0) {
-                layout->list[i].err = -1;
+                layout->list[i].err = 0;
                 gf_log (this->name, GF_LOG_TRACE,
                         "missing disk layout on %s. err = %d",
                         subvol->name, err);
@@ -453,12 +454,19 @@ dht_layout_entry_cmp (dht_layout_t *layout, int i, int j)
 {
         int64_t diff = 0;
 
+        /* swap zero'ed out layouts to front, if needed */
+        if (!layout->list[j].start && !layout->list[j].stop) {
+                diff = (int64_t) layout->list[i].stop
+                       - (int64_t) layout->list[j].stop;
+                       goto out;
+        }
         if (layout->list[i].err || layout->list[j].err)
                 diff = layout->list[i].err - layout->list[j].err;
         else
                 diff = (int64_t) layout->list[i].start
                         - (int64_t) layout->list[j].start;
 
+out:
         return diff;
 }
 
@@ -529,23 +537,30 @@ dht_layout_anomalies (xlator_t *this, loc_t *loc, dht_layout_t *layout,
         prev_stop = last_stop;
 
         for (i = 0; i < layout->cnt; i++) {
-                if (layout->list[i].err) {
-                        switch (layout->list[i].err) {
-                        case -1:
-                        case ENOENT:
-                                missing++;
-                                break;
-                        case ENOTCONN:
-                                down++;
-                                break;
-                        case ENOSPC:
-                                no_space++;
-                                break;
-                        default:
-                                misc++;
+                switch (layout->list[i].err) {
+                case -1:
+                case ENOENT:
+                        missing++;
+                        continue;
+                case ENOTCONN:
+                        down++;
+                        continue;
+                case ENOSPC:
+                        no_space++;
+                        continue;
+                case 0:
+                        /* if err == 0 and start == stop, then it is a non misc++;
+                         * participating subvolume(spread-cnt). Then, do not
+                         * check for anomalies. If start != stop, then treat it
+                         * as misc err */
+                        if (layout->list[i].start == layout->list[i].stop) {
+                                continue;
                         }
+                        break;
+                default:
+                        misc++;
                         continue;
-                }
+                 }
 
                 is_virgin = 0;
 
@@ -650,30 +665,29 @@ out:
 }
 
 int
-dht_dir_has_layout (dict_t *xattr)
+dht_dir_has_layout (dict_t *xattr, char *name)
 {
 
         void     *disk_layout_raw = NULL;
 
-        return dict_get_ptr (xattr, "trusted.glusterfs.dht",
-                             &disk_layout_raw);
-
+        return dict_get_ptr (xattr, name, &disk_layout_raw);
 }
 
 int
 dht_layout_dir_mismatch (xlator_t *this, dht_layout_t *layout, xlator_t *subvol,
                          loc_t *loc, dict_t *xattr)
 {
-        int       idx = 0;
-        int       pos = -1;
-        int       ret = 0;
-        int       err = 0;
-        int       dict_ret = 0;
-        int32_t   disk_layout[4];
-        void     *disk_layout_raw = NULL;
-        int32_t   count = -1;
-        uint32_t  start_off = -1;
-        uint32_t  stop_off = -1;
+        int         idx = 0;
+        int         pos = -1;
+        int         ret = 0;
+        int         err = 0;
+        int         dict_ret = 0;
+        int32_t     disk_layout[4];
+        void       *disk_layout_raw = NULL;
+        int32_t     count = -1;
+        uint32_t    start_off = -1;
+        uint32_t    stop_off = -1;
+        dht_conf_t *conf = this->private;
 
 
         for (idx = 0; idx < layout->cnt; idx++) {
@@ -703,7 +717,7 @@ dht_layout_dir_mismatch (xlator_t *this, dht_layout_t *layout, xlator_t *subvol,
                 goto out;
         }
 
-        dict_ret = dict_get_ptr (xattr, "trusted.glusterfs.dht",
+        dict_ret = dict_get_ptr (xattr, conf->xattr_name,
                                  &disk_layout_raw);
 
         if (dict_ret < 0) {
diff --git a/xlators/cluster/dht/src/dht-linkfile.c b/xlators/cluster/dht/src/dht-linkfile.c
index 67d6ce583..dbc9d0b3c 100644
--- a/xlators/cluster/dht/src/dht-linkfile.c
+++ b/xlators/cluster/dht/src/dht-linkfile.c
@@ -19,6 +19,35 @@
 #include "compat.h"
 #include "dht-common.h"
 
+int
+dht_linkfile_lookup_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                         int op_ret, int op_errno,
+                         inode_t *inode, struct iatt *stbuf, dict_t *xattr,
+                         struct iatt *postparent)
+{
+        char          is_linkfile   = 0;
+        dht_conf_t   *conf          = NULL;
+        dht_local_t  *local         = NULL;
+        call_frame_t *prev          = NULL;
+
+        local = frame->local;
+        prev = cookie;
+        conf = this->private;
+
+        if (op_ret)
+                goto out;
+
+        is_linkfile = check_is_linkfile (inode, stbuf, xattr,
+                                         conf->link_xattr_name);
+        if (!is_linkfile)
+                gf_log (this->name, GF_LOG_WARNING, "got non-linkfile %s:%s",
+                        prev->this->name, local->loc.path);
+out:
+        local->linkfile.linkfile_cbk (frame, cookie, this, op_ret, op_errno,
+                                      inode, stbuf, postparent, postparent,
+                                      xattr);
+        return 0;
+}
 
 #define is_equal(a, b) (a == b)
 int
@@ -28,27 +57,61 @@ dht_linkfile_create_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                          struct iatt *postparent, dict_t *xdata)
 {
         dht_local_t  *local = NULL;
+        xlator_t     *subvol = NULL;
+        call_frame_t *prev = NULL;
+        dict_t       *xattrs = NULL;
+        dht_conf_t   *conf = NULL;
+        int           ret = -1;
 
         local = frame->local;
 
         if (!op_ret)
                 local->linked = _gf_true;
 
+        FRAME_SU_UNDO (frame, dht_local_t);
+
+        if (op_ret && (op_errno == EEXIST)) {
+                conf = this->private;
+                prev = cookie;
+                subvol = prev->this;
+                if (!subvol)
+                        goto out;
+                xattrs = dict_new ();
+                if (!xattrs)
+                        goto out;
+                ret = dict_set_uint32 (xattrs, conf->link_xattr_name, 256);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Failed to set linkto key");
+                        goto out;
+                }
+
+                STACK_WIND (frame, dht_linkfile_lookup_cbk, subvol,
+                            subvol->fops->lookup, &local->loc, xattrs);
+                if (xattrs)
+                        dict_unref (xattrs);
+                return 0;
+        }
+out:
         local->linkfile.linkfile_cbk (frame, cookie, this, op_ret, op_errno,
                                       inode, stbuf, preparent, postparent,
                                       xdata);
+        if (xattrs)
+                dict_unref (xattrs);
         return 0;
 }
 
 
 int
 dht_linkfile_create (call_frame_t *frame, fop_mknod_cbk_t linkfile_cbk,
+                     xlator_t *this,
                      xlator_t *tovol, xlator_t *fromvol, loc_t *loc)
 {
         dht_local_t *local = NULL;
         dict_t      *dict = NULL;
         int          need_unref = 0;
         int          ret = 0;
+        dht_conf_t  *conf = this->private;
 
         local = frame->local;
         local->linkfile.linkfile_cbk = linkfile_cbk;
@@ -76,8 +139,7 @@ dht_linkfile_create (call_frame_t *frame, fop_mknod_cbk_t linkfile_cbk,
                 gf_log ("dht-linkfile", GF_LOG_INFO,
                         "%s: internal-fop set failed", loc->path);
 
-        ret = dict_set_str (dict, "trusted.glusterfs.dht.linkto",
-                                   tovol->name);
+        ret = dict_set_str (dict, conf->link_xattr_name, tovol->name);
 
         if (ret < 0) {
                 gf_log (frame->this->name, GF_LOG_INFO,
@@ -87,6 +149,9 @@ dht_linkfile_create (call_frame_t *frame, fop_mknod_cbk_t linkfile_cbk,
         }
 
         local->link_subvol = fromvol;
+        /* Always create as root:root. dht_linkfile_attr_heal fixes the
+         * ownsership */
+        FRAME_SU_DO (frame, dht_local_t);
         STACK_WIND (frame, dht_linkfile_create_cbk,
                     fromvol, fromvol->fops->mknod, loc,
                     S_IFREG | DHT_LINKFILE_MODE, 0, 0, dict);
@@ -179,7 +244,7 @@ dht_linkfile_subvol (xlator_t *this, inode_t *inode, struct iatt *stbuf,
         if (!xattr)
                 goto out;
 
-        ret = dict_get_ptr (xattr, "trusted.glusterfs.dht.linkto", &volname);
+        ret = dict_get_ptr (xattr, conf->link_xattr_name, &volname);
 
         if ((-1 == ret) || !volname)
                 goto out;
@@ -232,11 +297,11 @@ dht_linkfile_attr_heal (call_frame_t *frame, xlator_t *this)
         GF_VALIDATE_OR_GOTO ("dht", local, out);
         GF_VALIDATE_OR_GOTO ("dht", local->link_subvol, out);
 
-        if ((local->stbuf.ia_type == IA_INVAL) ||
-            (is_equal (frame->root->uid, local->stbuf.ia_uid) &&
-             is_equal (frame->root->gid, local->stbuf.ia_gid)))
+        if (local->stbuf.ia_type == IA_INVAL)
                 return 0;
 
+        uuid_copy (local->loc.gfid, local->stbuf.ia_gfid);
+
         copy = copy_frame (frame);
 
         if (!copy)
@@ -252,6 +317,8 @@ dht_linkfile_attr_heal (call_frame_t *frame, xlator_t *this)
 
         copy->local = copy_local;
 
+        FRAME_SU_DO (copy, dht_local_t);
+
         STACK_WIND (copy, dht_linkfile_setattr_cbk, subvol,
                     subvol->fops->setattr, &copy_local->loc,
                     &stbuf, (GF_SET_ATTR_UID | GF_SET_ATTR_GID), NULL);
diff --git a/xlators/cluster/dht/src/dht-rebalance.c b/xlators/cluster/dht/src/dht-rebalance.c
index af31072aa..bcb19f23e 100644
--- a/xlators/cluster/dht/src/dht-rebalance.c
+++ b/xlators/cluster/dht/src/dht-rebalance.c
@@ -102,12 +102,16 @@ gf_defrag_handle_hardlink (xlator_t *this, loc_t *loc, dict_t  *xattrs,
         data_t                 *data            = NULL;
         struct iatt             iatt            = {0,};
         int32_t                 op_errno        = 0;
+        dht_conf_t             *conf            = NULL;
 
         GF_VALIDATE_OR_GOTO ("defrag", loc, out);
         GF_VALIDATE_OR_GOTO ("defrag", loc->name, out);
         GF_VALIDATE_OR_GOTO ("defrag", stbuf, out);
         GF_VALIDATE_OR_GOTO ("defrag", this, out);
         GF_VALIDATE_OR_GOTO ("defrag", xattrs, out);
+        GF_VALIDATE_OR_GOTO ("defrag", this->private, out);
+
+        conf = this->private;
 
         if (uuid_is_null (loc->pargfid)) {
                 gf_log ("", GF_LOG_ERROR, "loc->pargfid is NULL for "
@@ -138,10 +142,10 @@ gf_defrag_handle_hardlink (xlator_t *this, loc_t *loc, dict_t  *xattrs,
         gf_log (this->name, GF_LOG_INFO, "Attempting to migrate hardlink %s "
                 "with gfid %s from %s -> %s", loc->name, uuid_utoa (loc->gfid),
                 cached_subvol->name, hashed_subvol->name);
-        data = dict_get (xattrs, DHT_LINKFILE_KEY);
+        data = dict_get (xattrs, conf->link_xattr_name);
         /* set linkto on cached -> hashed if not present, else link it */
         if (!data) {
-                ret = dict_set_str (xattrs, DHT_LINKFILE_KEY,
+                ret = dict_set_str (xattrs, conf->link_xattr_name,
                                     hashed_subvol->name);
                 if (ret) {
                         gf_log (this->name, GF_LOG_ERROR, "Failed to set "
@@ -239,14 +243,16 @@ out:
 
 static inline int
 __dht_rebalance_create_dst_file (xlator_t *to, xlator_t *from, loc_t *loc, struct iatt *stbuf,
-                                 dict_t *dict, fd_t **dst_fd)
+                                 dict_t *dict, fd_t **dst_fd, dict_t *xattr)
 {
-        xlator_t *this = NULL;
-        int       ret  = -1;
-        fd_t     *fd   = NULL;
-        struct iatt new_stbuf = {0,};
+        xlator_t    *this = NULL;
+        int          ret  = -1;
+        fd_t        *fd   = NULL;
+        struct iatt  new_stbuf = {0,};
+        dht_conf_t  *conf = NULL;
 
         this = THIS;
+        conf = this->private;
 
         ret = dict_set_static_bin (dict, "gfid-req", stbuf->ia_gfid, 16);
         if (ret) {
@@ -255,7 +261,7 @@ __dht_rebalance_create_dst_file (xlator_t *to, xlator_t *from, loc_t *loc, struc
                 goto out;
         }
 
-        ret = dict_set_str (dict, DHT_LINKFILE_KEY, from->name);
+        ret = dict_set_str (dict, conf->link_xattr_name, from->name);
         if (ret) {
                 gf_log (this->name, GF_LOG_ERROR,
                         "%s: failed to set gfid in dict for create", loc->path);
@@ -293,7 +299,7 @@ __dht_rebalance_create_dst_file (xlator_t *to, xlator_t *from, loc_t *loc, struc
         /* Create the destination with LINKFILE mode, and linkto xattr,
            if the linkfile already exists, it will just open the file */
         ret = syncop_create (to, loc, O_RDWR, DHT_LINKFILE_MODE, fd,
-                             dict);
+                             dict, &new_stbuf);
         if (ret < 0) {
                 gf_log (this->name, GF_LOG_ERROR,
                         "failed to create %s on %s (%s)",
@@ -301,6 +307,12 @@ __dht_rebalance_create_dst_file (xlator_t *to, xlator_t *from, loc_t *loc, struc
                 goto out;
         }
 
+        ret = syncop_fsetxattr (to, fd, xattr, 0);
+        if (ret == -1)
+                gf_log (this->name, GF_LOG_WARNING,
+                        "%s: failed to set xattr on %s (%s)",
+                        loc->path, to->name, strerror (errno));
+
         ret = syncop_ftruncate (to, fd, stbuf->ia_size);
         if (ret < 0)
                 gf_log (this->name, GF_LOG_ERROR,
@@ -334,6 +346,9 @@ __dht_check_free_space (xlator_t *to, xlator_t *from, loc_t *loc,
         int             ret        = -1;
         xlator_t       *this       = NULL;
 
+        uint64_t        src_statfs_blocks = 1;
+        uint64_t        dst_statfs_blocks = 1;
+
         this = THIS;
 
         ret = syncop_statfs (from, loc, &src_statfs);
@@ -357,22 +372,34 @@ __dht_check_free_space (xlator_t *to, xlator_t *from, loc_t *loc,
         if (flag != GF_DHT_MIGRATE_DATA)
                 goto check_avail_space;
 
-        if (((dst_statfs.f_bavail *
-              dst_statfs.f_bsize) / GF_DISK_SECTOR_SIZE) <
-            (((src_statfs.f_bavail * src_statfs.f_bsize) /
-              GF_DISK_SECTOR_SIZE) - stbuf->ia_blocks)) {
-                gf_log (this->name, GF_LOG_WARNING,
-                        "data movement attempted from node (%s) with"
-                        " higher disk space to a node (%s) with "
-                        "lesser disk space (%s)", from->name,
-                        to->name, loc->path);
-
-                /* this is not a 'failure', but we don't want to
-                   consider this as 'success' too :-/ */
-                ret = 1;
-                goto out;
+        /* Check:
+           During rebalance `migrate-data` - Destination subvol experiences
+           a `reduction` in 'blocks' of free space, at the same time source
+           subvol gains certain 'blocks' of free space. A valid check is
+           necessary here to avoid errorneous move to destination where
+           the space could be scantily available.
+         */
+        if (stbuf) {
+                dst_statfs_blocks = ((dst_statfs.f_bavail *
+                                      dst_statfs.f_bsize) /
+                                     GF_DISK_SECTOR_SIZE);
+                src_statfs_blocks = ((src_statfs.f_bavail *
+                                      src_statfs.f_bsize) /
+                                     GF_DISK_SECTOR_SIZE);
+                if ((dst_statfs_blocks - stbuf->ia_blocks) <
+                    (src_statfs_blocks + stbuf->ia_blocks)) {
+                        gf_log (this->name, GF_LOG_WARNING,
+                                "data movement attempted from node (%s) with"
+                                " higher disk space to a node (%s) with "
+                                "lesser disk space (%s)", from->name,
+                                to->name, loc->path);
+
+                        /* this is not a 'failure', but we don't want to
+                           consider this as 'success' too :-/ */
+                        ret = 1;
+                        goto out;
+                }
         }
-
 check_avail_space:
         if (((dst_statfs.f_bavail * dst_statfs.f_bsize) /
               GF_DISK_SECTOR_SIZE) < stbuf->ia_blocks) {
@@ -449,8 +476,10 @@ __dht_rebalance_open_src_file (xlator_t *from, xlator_t *to, loc_t *loc,
         dict_t      *dict = NULL;
         xlator_t    *this = NULL;
         struct iatt  iatt = {0,};
+        dht_conf_t  *conf = NULL;
 
         this = THIS;
+        conf = this->private;
 
         fd = fd_create (loc->inode, DHT_REBALANCE_PID);
         if (!fd) {
@@ -473,7 +502,7 @@ __dht_rebalance_open_src_file (xlator_t *from, xlator_t *to, loc_t *loc,
         if (!dict)
                 goto out;
 
-        ret = dict_set_str (dict, DHT_LINKFILE_KEY, to->name);
+        ret = dict_set_str (dict, conf->link_xattr_name, to->name);
         if (ret) {
                 gf_log (this->name, GF_LOG_ERROR,
                         "failed to set xattr in dict for %s (linkto:%s)",
@@ -526,12 +555,13 @@ migrate_special_files (xlator_t *this, xlator_t *from, xlator_t *to, loc_t *loc,
         dict_t      *dict     = NULL;
         char        *link     = NULL;
         struct iatt  stbuf    = {0,};
+        dht_conf_t  *conf     = this->private;
 
         dict = dict_new ();
         if (!dict)
                 goto out;
 
-        ret = dict_set_int32 (dict, DHT_LINKFILE_KEY, 256);
+        ret = dict_set_int32 (dict, conf->link_xattr_name, 256);
         if (ret) {
                 gf_log (this->name, GF_LOG_ERROR,
                         "%s: failed to set 'linkto' key in dict", loc->path);
@@ -547,12 +577,13 @@ migrate_special_files (xlator_t *this, xlator_t *from, xlator_t *to, loc_t *loc,
         }
 
         /* we no more require this key */
-        dict_del (dict, DHT_LINKFILE_KEY);
+        dict_del (dict, conf->link_xattr_name);
 
         /* file exists in target node, only if it is 'linkfile' its valid,
            otherwise, error out */
         if (!ret) {
-                if (!check_is_linkfile (loc->inode, &stbuf, rsp_dict)) {
+                if (!check_is_linkfile (loc->inode, &stbuf, rsp_dict,
+                                        conf->link_xattr_name)) {
                         gf_log (this->name, GF_LOG_WARNING,
                                 "%s: file exists in destination", loc->path);
                         ret = -1;
@@ -588,7 +619,7 @@ migrate_special_files (xlator_t *this, xlator_t *from, xlator_t *to, loc_t *loc,
                         goto out;
                 }
 
-                ret = syncop_symlink (to, loc, link, dict);
+                ret = syncop_symlink (to, loc, link, dict, 0);
                 if (ret) {
                         gf_log (this->name, GF_LOG_WARNING,
                                 "%s: creating symlink failed (%s)",
@@ -602,7 +633,7 @@ migrate_special_files (xlator_t *this, xlator_t *from, xlator_t *to, loc_t *loc,
         ret = syncop_mknod (to, loc, st_mode_from_ia (buf->ia_prot,
                                                       buf->ia_type),
                             makedev (ia_major (buf->ia_rdev),
-                                     ia_minor (buf->ia_rdev)), dict);
+                                     ia_minor (buf->ia_rdev)), dict, 0);
         if (ret) {
                 gf_log (this->name, GF_LOG_WARNING, "%s: mknod failed (%s)",
                         loc->path, strerror (errno));
@@ -610,6 +641,15 @@ migrate_special_files (xlator_t *this, xlator_t *from, xlator_t *to, loc_t *loc,
         }
 
 done:
+        ret = syncop_setattr (to, loc, buf,
+                              (GF_SET_ATTR_UID | GF_SET_ATTR_GID |
+                               GF_SET_ATTR_MODE), NULL, NULL);
+        if (ret) {
+                gf_log (this->name, GF_LOG_WARNING,
+                        "%s: failed to perform setattr on %s (%s)",
+                        loc->path, to->name, strerror (errno));
+        }
+
         ret = syncop_unlink (from, loc);
         if (ret)
                 gf_log (this->name, GF_LOG_WARNING, "%s: unlink failed (%s)",
@@ -647,6 +687,7 @@ dht_migrate_file (xlator_t *this, loc_t *loc, xlator_t *from, xlator_t *to,
         dict_t         *xattr          = NULL;
         dict_t         *xattr_rsp      = NULL;
         int             file_has_holes = 0;
+        dht_conf_t     *conf           = this->private;
 
         gf_log (this->name, GF_LOG_INFO, "%s: attempting to move from %s to %s",
                 loc->path, from->name, to->name);
@@ -655,7 +696,7 @@ dht_migrate_file (xlator_t *this, loc_t *loc, xlator_t *from, xlator_t *to,
         if (!dict)
                 goto out;
 
-        ret = dict_set_int32 (dict, DHT_LINKFILE_KEY, 256);
+        ret = dict_set_int32 (dict, conf->link_xattr_name, 256);
         if (ret) {
                 gf_log (this->name, GF_LOG_ERROR,
                         "%s: failed to set 'linkto' key in dict", loc->path);
@@ -671,7 +712,7 @@ dht_migrate_file (xlator_t *this, loc_t *loc, xlator_t *from, xlator_t *to,
         }
 
         /* we no more require this key */
-        dict_del (dict, DHT_LINKFILE_KEY);
+        dict_del (dict, conf->link_xattr_name);
 
         /* preserve source mode, so set the same to the destination */
         src_ia_prot = stbuf.ia_prot;
@@ -688,9 +729,16 @@ dht_migrate_file (xlator_t *this, loc_t *loc, xlator_t *from, xlator_t *to,
                 goto out;
         }
 
+        /* TODO: move all xattr related operations to fd based operations */
+        ret = syncop_listxattr (from, loc, &xattr);
+        if (ret == -1)
+                gf_log (this->name, GF_LOG_WARNING,
+                        "%s: failed to get xattr from %s (%s)",
+                        loc->path, from->name, strerror (errno));
+
         /* create the destination, with required modes/xattr */
         ret = __dht_rebalance_create_dst_file (to, from, loc, &stbuf,
-                                               dict, &dst_fd);
+                                               dict, &dst_fd, xattr);
         if (ret)
                 goto out;
 
@@ -707,6 +755,7 @@ dht_migrate_file (xlator_t *this, loc_t *loc, xlator_t *from, xlator_t *to,
                 goto out;
         }
 
+
         ret = syncop_fstat (from, src_fd, &stbuf);
         if (ret) {
                 gf_log (this->name, GF_LOG_ERROR, "failed to lookup %s on %s (%s)",
@@ -736,19 +785,6 @@ dht_migrate_file (xlator_t *this, loc_t *loc, xlator_t *from, xlator_t *to,
                 goto out;
         }
 
-        /* TODO: move all xattr related operations to fd based operations */
-        ret = syncop_listxattr (from, loc, &xattr);
-        if (ret == -1)
-                gf_log (this->name, GF_LOG_WARNING,
-                        "%s: failed to get xattr from %s (%s)",
-                        loc->path, from->name, strerror (errno));
-
-        ret = syncop_setxattr (to, loc, xattr, 0);
-        if (ret == -1)
-                gf_log (this->name, GF_LOG_WARNING,
-                        "%s: failed to set xattr on %s (%s)",
-                        loc->path, to->name, strerror (errno));
-
         /* TODO: Sync the locks */
 
         ret = syncop_fsync (to, dst_fd, 0);
@@ -812,6 +848,23 @@ dht_migrate_file (xlator_t *this, loc_t *loc, xlator_t *from, xlator_t *to,
                 goto out;
         }
 
+       /* Free up the data blocks on the source node, as the whole
+           file is migrated */
+        ret = syncop_ftruncate (from, src_fd, 0);
+        if (ret) {
+                gf_log (this->name, GF_LOG_WARNING,
+                        "%s: failed to perform truncate on %s (%s)",
+                        loc->path, from->name, strerror (errno));
+        }
+
+        /* remove the 'linkto' xattr from the destination */
+        ret = syncop_fremovexattr (to, dst_fd, conf->link_xattr_name);
+        if (ret) {
+                gf_log (this->name, GF_LOG_WARNING,
+                        "%s: failed to perform removexattr on %s (%s)",
+                        loc->path, to->name, strerror (errno));
+        }
+
         /* Do a stat and check the gfid before unlink */
         ret = syncop_stat (from, loc, &empty_iatt);
         if (ret) {
@@ -832,23 +885,6 @@ dht_migrate_file (xlator_t *this, loc_t *loc, xlator_t *from, xlator_t *to,
                 }
         }
 
-        /* Free up the data blocks on the source node, as the whole
-           file is migrated */
-        ret = syncop_ftruncate (from, src_fd, 0);
-        if (ret) {
-                gf_log (this->name, GF_LOG_WARNING,
-                        "%s: failed to perform truncate on %s (%s)",
-                        loc->path, from->name, strerror (errno));
-        }
-
-        /* remove the 'linkto' xattr from the destination */
-        ret = syncop_fremovexattr (to, dst_fd, DHT_LINKFILE_KEY);
-        if (ret) {
-                gf_log (this->name, GF_LOG_WARNING,
-                        "%s: failed to perform removexattr on %s (%s)",
-                        loc->path, to->name, strerror (errno));
-        }
-
         ret = syncop_lookup (this, loc, NULL, NULL, NULL, NULL);
         if (ret) {
                 gf_log (this->name, GF_LOG_DEBUG,
@@ -1090,6 +1126,7 @@ gf_defrag_migrate_data (xlator_t *this, gf_defrag_info_t *defrag, loc_t *loc,
         struct timeval           end            = {0,};
         double                   elapsed        = {0,};
         struct timeval           start          = {0,};
+        int32_t                  err            = 0;
 
         gf_log (this->name, GF_LOG_INFO, "migrate data called on %s",
                 loc->path);
@@ -1247,9 +1284,21 @@ gf_defrag_migrate_data (xlator_t *this, gf_defrag_info_t *defrag, loc_t *loc,
                         ret = syncop_setxattr (this, &entry_loc, migrate_data,
                                                0);
                         if (ret) {
-                                gf_log (this->name, GF_LOG_ERROR, "migrate-data"
-                                        " failed for %s", entry_loc.path);
-                                defrag->total_failures +=1;
+                                err = op_errno;
+                                /* errno is overloaded. See
+                                 * rebalance_task_completion () */
+                                if (err != ENOSPC) {
+                                        gf_log (this->name, GF_LOG_DEBUG,
+                                                "migrate-data skipped for %s"
+                                                " due to space constraints",
+                                                entry_loc.path);
+                                        defrag->skipped +=1;
+                                } else{
+                                        gf_log (this->name, GF_LOG_ERROR,
+                                                "migrate-data failed for %s",
+                                                entry_loc.path);
+                                        defrag->total_failures +=1;
+                                }
                         }
 
                         if (ret == -1) {
@@ -1648,6 +1697,7 @@ gf_defrag_status_get (gf_defrag_info_t *defrag, dict_t *dict)
         uint64_t size   = 0;
         uint64_t lookup = 0;
         uint64_t failures = 0;
+        uint64_t skipped = 0;
         char     *status = "";
         double   elapsed = 0;
         struct timeval end = {0,};
@@ -1664,6 +1714,7 @@ gf_defrag_status_get (gf_defrag_info_t *defrag, dict_t *dict)
         size   = defrag->total_data;
         lookup = defrag->num_files_lookedup;
         failures = defrag->total_failures;
+        skipped = defrag->skipped;
 
         gettimeofday (&end, NULL);
 
@@ -1687,6 +1738,7 @@ gf_defrag_status_get (gf_defrag_info_t *defrag, dict_t *dict)
                 gf_log (THIS->name, GF_LOG_WARNING,
                         "failed to set lookedup file count");
 
+
         ret = dict_set_int32 (dict, "status", defrag->defrag_status);
         if (ret)
                 gf_log (THIS->name, GF_LOG_WARNING,
@@ -1699,6 +1751,14 @@ gf_defrag_status_get (gf_defrag_info_t *defrag, dict_t *dict)
         }
 
         ret = dict_set_uint64 (dict, "failures", failures);
+        if (ret)
+                gf_log (THIS->name, GF_LOG_WARNING,
+                        "failed to set failure count");
+
+        ret = dict_set_uint64 (dict, "skipped", skipped);
+        if (ret)
+                gf_log (THIS->name, GF_LOG_WARNING,
+                        "failed to set skipped file count");
 log:
         switch (defrag->defrag_status) {
         case GF_DEFRAG_STATUS_NOT_STARTED:
@@ -1716,13 +1776,15 @@ log:
         case GF_DEFRAG_STATUS_FAILED:
                 status = "failed";
                 break;
+        default:
+                break;
         }
 
         gf_log (THIS->name, GF_LOG_INFO, "Rebalance is %s. Time taken is %.2f "
                 "secs", status, elapsed);
         gf_log (THIS->name, GF_LOG_INFO, "Files migrated: %"PRIu64", size: %"
-                PRIu64", lookups: %"PRIu64", failures: %"PRIu64, files, size,
-                lookup, failures);
+                PRIu64", lookups: %"PRIu64", failures: %"PRIu64", skipped: "
+                "%"PRIu64, files, size, lookup, failures, skipped);
 
 
 out:
diff --git a/xlators/cluster/dht/src/dht-rename.c b/xlators/cluster/dht/src/dht-rename.c
index 35fedeaa7..5d6f4f232 100644
--- a/xlators/cluster/dht/src/dht-rename.c
+++ b/xlators/cluster/dht/src/dht-rename.c
@@ -306,7 +306,38 @@ err:
                           NULL, NULL);
         return 0;
 }
+#define DHT_MARK_FOP_INTERNAL(xattr) do {                                      \
+                int tmp = -1;                                                  \
+                if (!xattr) {                                                  \
+                        xattr = dict_new ();                                   \
+                        if (!xattr)                                            \
+                                break;                                         \
+                }                                                              \
+                tmp = dict_set_str (xattr, GLUSTERFS_INTERNAL_FOP_KEY, "yes"); \
+                if (tmp) {                                                     \
+                        gf_log (this->name, GF_LOG_ERROR, "Failed to set"      \
+                                " internal dict key for %s", local->loc.path); \
+                }                                                              \
+        }while (0)
+int
+dht_rename_done (call_frame_t *frame, xlator_t *this)
+{
+        dht_local_t     *local = NULL;
+
+        local = frame->local;
+
+        if (local->linked == _gf_true) {
+                local->linked = _gf_false;
+                dht_linkfile_attr_heal (frame, this);
+        }
+        DHT_STRIP_PHASE1_FLAGS (&local->stbuf);
+        DHT_STACK_UNWIND (rename, frame, local->op_ret, local->op_errno,
+                          &local->stbuf, &local->preoldparent,
+                          &local->postoldparent, &local->preparent,
+                          &local->postparent, NULL);
 
+        return 0;
+}
 
 int
 dht_rename_unlink_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
@@ -340,11 +371,7 @@ dht_rename_unlink_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
         WIPE (&local->postparent);
 
         if (is_last_call (this_call_cnt)) {
-                DHT_STRIP_PHASE1_FLAGS (&local->stbuf);
-                DHT_STACK_UNWIND (rename, frame, local->op_ret, local->op_errno,
-                                  &local->stbuf, &local->preoldparent,
-                                  &local->postoldparent, &local->preparent,
-                                  &local->postparent, NULL);
+                dht_rename_done (frame, this);
         }
 
 out:
@@ -362,7 +389,7 @@ dht_rename_cleanup (call_frame_t *frame)
         xlator_t    *dst_hashed = NULL;
         xlator_t    *dst_cached = NULL;
         int          call_cnt = 0;
-
+        dict_t      *xattr      = NULL;
 
         local = frame->local;
         this  = frame->this;
@@ -386,13 +413,15 @@ dht_rename_cleanup (call_frame_t *frame)
         if (!call_cnt)
                 goto nolinks;
 
+        DHT_MARK_FOP_INTERNAL (xattr);
+
         if (dst_hashed != src_hashed && dst_hashed != src_cached) {
                 gf_log (this->name, GF_LOG_TRACE,
                         "unlinking linkfile %s @ %s => %s",
                         local->loc.path, dst_hashed->name, src_cached->name);
                 STACK_WIND (frame, dht_rename_unlink_cbk,
                             dst_hashed, dst_hashed->fops->unlink,
-                            &local->loc, 0, NULL);
+                            &local->loc, 0, xattr);
         }
 
         if (src_cached != dst_hashed) {
@@ -401,9 +430,12 @@ dht_rename_cleanup (call_frame_t *frame)
                         local->loc2.path, src_cached->name);
                 STACK_WIND (frame, dht_rename_unlink_cbk,
                             src_cached, src_cached->fops->unlink,
-                            &local->loc2, 0, NULL);
+                            &local->loc2, 0, xattr);
         }
 
+        if (xattr)
+                dict_unref (xattr);
+
         return 0;
 
 nolinks:
@@ -467,6 +499,7 @@ dht_rename_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
         xlator_t     *rename_subvol = NULL;
         call_frame_t *link_frame = NULL;
         dht_local_t *link_local = NULL;
+        dict_t       *xattr     = NULL;
 
         local = frame->local;
         prev = cookie;
@@ -476,6 +509,8 @@ dht_rename_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
         dst_hashed = local->dst_hashed;
         dst_cached = local->dst_cached;
 
+        if (local->linked == _gf_true)
+                FRAME_SU_UNDO (frame, dht_local_t);
         if (op_ret == -1) {
                 gf_log (this->name, GF_LOG_WARNING,
                         "%s: rename on %s failed (%s)", local->loc.path,
@@ -505,21 +540,26 @@ dht_rename_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                 uuid_copy (link_local->gfid, local->loc.inode->gfid);
 
                 dht_linkfile_create (link_frame, dht_rename_links_create_cbk,
-                                     src_cached, dst_hashed, &link_local->loc);
+                                     this, src_cached, dst_hashed,
+                                     &link_local->loc);
         }
 
 err:
-        dht_iatt_merge (this, &local->stbuf, stbuf, prev->this);
-        dht_iatt_merge (this, &local->preoldparent, preoldparent, prev->this);
-        dht_iatt_merge (this, &local->postoldparent, postoldparent, prev->this);
-        dht_iatt_merge (this, &local->preparent, prenewparent, prev->this);
-        dht_iatt_merge (this, &local->postparent, postnewparent, prev->this);
-
-        if (local->linked == _gf_true) {
-                local->linked = _gf_false;
-                dht_linkfile_attr_heal (frame, this);
+        /* Merge attrs only from src_cached. In case there of src_cached !=
+         * dst_hashed, this ignores linkfile attrs. */
+        if (prev->this == src_cached) {
+                dht_iatt_merge (this, &local->stbuf, stbuf, prev->this);
+                dht_iatt_merge (this, &local->preoldparent, preoldparent,
+                                prev->this);
+                dht_iatt_merge (this, &local->postoldparent, postoldparent,
+                                prev->this);
+                dht_iatt_merge (this, &local->preparent, prenewparent,
+                                prev->this);
+                dht_iatt_merge (this, &local->postparent, postnewparent,
+                                prev->this);
         }
 
+
         /* NOTE: rename_subvol is the same subvolume from which dht_rename_cbk
          *       is called. since rename has already happened on rename_subvol,
          *       unlink should not be sent for oldpath (either linkfile or cached-file)
@@ -543,6 +583,8 @@ err:
         if (local->call_cnt == 0)
                 goto unwind;
 
+        DHT_MARK_FOP_INTERNAL (xattr);
+
         if (src_cached != dst_hashed && src_cached != dst_cached) {
                 gf_log (this->name, GF_LOG_TRACE,
                         "deleting old src datafile %s @ %s",
@@ -550,7 +592,7 @@ err:
 
                 STACK_WIND (frame, dht_rename_unlink_cbk,
                             src_cached, src_cached->fops->unlink,
-                            &local->loc, 0, NULL);
+                            &local->loc, 0, xattr);
         }
 
         if (src_hashed != rename_subvol && src_hashed != src_cached) {
@@ -560,7 +602,7 @@ err:
 
                 STACK_WIND (frame, dht_rename_unlink_cbk,
                             src_hashed, src_hashed->fops->unlink,
-                            &local->loc, 0, NULL);
+                            &local->loc, 0, xattr);
         }
 
         if (dst_cached
@@ -572,8 +614,10 @@ err:
 
                 STACK_WIND (frame, dht_rename_unlink_cbk,
                             dst_cached, dst_cached->fops->unlink,
-                            &local->loc2, 0, NULL);
+                            &local->loc2, 0, xattr);
         }
+        if (xattr)
+                dict_unref (xattr);
         return 0;
 
 unwind:
@@ -581,16 +625,16 @@ unwind:
         WIPE (&local->postoldparent);
         WIPE (&local->preparent);
         WIPE (&local->postparent);
+        if (xattr)
+                dict_unref (xattr);
 
-        DHT_STRIP_PHASE1_FLAGS (&local->stbuf);
-        DHT_STACK_UNWIND (rename, frame, local->op_ret, local->op_errno,
-                          &local->stbuf, &local->preoldparent,
-                          &local->postoldparent, &local->preparent,
-                          &local->postparent, NULL);
+        dht_rename_done (frame, this);
 
         return 0;
 
 cleanup:
+        if (xattr)
+                dict_unref (xattr);
         dht_rename_cleanup (frame);
 
         return 0;
@@ -624,6 +668,8 @@ dht_do_rename (call_frame_t *frame)
                 "renaming %s => %s (%s)",
                 local->loc.path, local->loc2.path, rename_subvol->name);
 
+        if (local->linked == _gf_true)
+                FRAME_SU_DO (frame, dht_local_t);
         STACK_WIND (frame, dht_rename_cbk,
                     rename_subvol, rename_subvol->fops->rename,
                     &local->loc, &local->loc2, NULL);
@@ -654,7 +700,8 @@ dht_rename_links_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                 local->op_ret   = -1;
                 if (op_errno != ENOENT)
                         local->op_errno = op_errno;
-        } else {
+        } else if (local->src_cached == prev->this) {
+                /* merge of attr returned only from linkfile creation */
                 dht_iatt_merge (this, &local->stbuf, stbuf, prev->this);
         }
 
@@ -721,6 +768,7 @@ dht_rename_create_links (call_frame_t *frame)
         xlator_t    *dst_hashed = NULL;
         xlator_t    *dst_cached = NULL;
         int          call_cnt = 0;
+        dict_t      *xattr = NULL;
 
 
         local = frame->local;
@@ -731,6 +779,7 @@ dht_rename_create_links (call_frame_t *frame)
         dst_hashed = local->dst_hashed;
         dst_cached = local->dst_cached;
 
+        DHT_MARK_FOP_INTERNAL (xattr);
 
         if (src_cached == dst_cached) {
                 if (dst_hashed == dst_cached)
@@ -742,7 +791,7 @@ dht_rename_create_links (call_frame_t *frame)
 
 		STACK_WIND (frame, dht_rename_unlink_links_cbk,
 			    dst_hashed, dst_hashed->fops->unlink,
-			    &local->loc2, 0, NULL);
+			    &local->loc2, 0, xattr);
                 return 0;
         }
 
@@ -759,7 +808,7 @@ dht_rename_create_links (call_frame_t *frame)
                         "linkfile %s @ %s => %s",
                         local->loc.path, dst_hashed->name, src_cached->name);
                 memcpy (local->gfid, local->loc.inode->gfid, 16);
-		dht_linkfile_create (frame, dht_rename_links_cbk,
+		dht_linkfile_create (frame, dht_rename_links_cbk, this,
 				     src_cached, dst_hashed, &local->loc);
 	}
 
@@ -769,7 +818,7 @@ dht_rename_create_links (call_frame_t *frame)
 			local->loc2.path, src_cached->name);
 		STACK_WIND (frame, dht_rename_links_cbk,
 			    src_cached, src_cached->fops->link,
-			    &local->loc, &local->loc2, NULL);
+			    &local->loc, &local->loc2, xattr);
 	}
 
 nolinks:
@@ -777,6 +826,8 @@ nolinks:
                 /* skip to next step */
                 dht_do_rename (frame);
         }
+        if (xattr)
+                dict_unref (xattr);
 
         return 0;
 }
diff --git a/xlators/cluster/dht/src/dht-selfheal.c b/xlators/cluster/dht/src/dht-selfheal.c
index 22c61130f..3fe96b1c7 100644
--- a/xlators/cluster/dht/src/dht-selfheal.c
+++ b/xlators/cluster/dht/src/dht-selfheal.c
@@ -17,6 +17,7 @@
 #include "glusterfs.h"
 #include "xlator.h"
 #include "dht-common.h"
+#include "glusterfs-acl.h"
 
 #define DHT_SET_LAYOUT_RANGE(layout,i,srt,chunk,cnt,path)    do {       \
                 layout->list[i].start = srt;                            \
@@ -28,6 +29,13 @@
                         layout->list[i].xlator->name, path);            \
         } while (0)
 
+#define DHT_RESET_LAYOUT_RANGE(layout)    do {                          \
+                int cnt = 0;                                            \
+                for (cnt = 0; cnt < layout->cnt; cnt++ ) {              \
+                        layout->list[cnt].start = 0;                    \
+                        layout->list[cnt].stop  = 0;                    \
+                }                                                       \
+        } while (0)
 
 static uint32_t
 dht_overlap_calc (dht_layout_t *old, int o, dht_layout_t *new, int n)
@@ -118,7 +126,7 @@ dht_selfheal_dir_xattr_persubvol (call_frame_t *frame, loc_t *loc,
         xlator_t          *this = NULL;
         int32_t           *disk_layout = NULL;
         dht_local_t       *local = NULL;
-
+        dht_conf_t        *conf = NULL;
 
         local = frame->local;
         if (req_subvol)
@@ -131,6 +139,9 @@ dht_selfheal_dir_xattr_persubvol (call_frame_t *frame, loc_t *loc,
         GF_VALIDATE_OR_GOTO (this->name, layout, err);
         GF_VALIDATE_OR_GOTO (this->name, local, err);
         GF_VALIDATE_OR_GOTO (this->name, subvol, err);
+        VALIDATE_OR_GOTO (this->private, err);
+
+        conf = this->private;
 
         xattr = get_new_dict ();
         if (!xattr) {
@@ -145,8 +156,7 @@ dht_selfheal_dir_xattr_persubvol (call_frame_t *frame, loc_t *loc,
                 goto err;
         }
 
-        ret = dict_set_bin (xattr, "trusted.glusterfs.dht",
-                            disk_layout, 4 * 4);
+        ret = dict_set_bin (xattr, conf->xattr_name, disk_layout, 4 * 4);
         if (ret == -1) {
                 gf_log (this->name, GF_LOG_WARNING,
                         "%s: (subvol %s) failed to set xattr dictionary",
@@ -237,9 +247,12 @@ dht_selfheal_dir_xattr (call_frame_t *frame, loc_t *loc, dht_layout_t *layout)
         int          missing_xattr = 0;
         int          i = 0;
         xlator_t    *this = NULL;
+        dht_conf_t   *conf = NULL;
+        dht_layout_t *dummy = NULL;
 
         local = frame->local;
         this = frame->this;
+        conf = this->private;
 
         for (i = 0; i < layout->cnt; i++) {
                 if (layout->list[i].err != -1 || !layout->list[i].stop) {
@@ -273,6 +286,18 @@ dht_selfheal_dir_xattr (call_frame_t *frame, loc_t *loc, dht_layout_t *layout)
                 if (--missing_xattr == 0)
                         break;
         }
+        dummy = dht_layout_new (this, 1);
+        if (!dummy)
+                goto out;
+        for (i = 0; i < conf->subvolume_cnt; i++) {
+                if (_gf_false ==
+                    dht_is_subvol_in_layout (layout, conf->subvolumes[i])) {
+                        dht_selfheal_dir_xattr_persubvol (frame, loc, dummy, 0,
+                                                          conf->subvolumes[i]);
+                }
+        }
+        dht_layout_unref (this, dummy);
+out:
         return 0;
 }
 
@@ -540,9 +565,33 @@ dht_get_layout_count (xlator_t *this, dht_layout_t *layout, int new_layout)
 
         for (i = 0; i < layout->cnt; i++) {
                 err = layout->list[i].err;
-                if (err == -1 || err == 0) {
-                        layout->list[i].err = -1;
+                if (err == -1 || err == 0 || err == ENOENT) {
+			/* Setting list[i].err = -1 is an indication for
+			   dht_selfheal_layout_new_directory() to assign
+			   a range. We set it to -1 based on any one of
+			   the three criteria:
+
+			   - err == -1 already, which means directory
+			     existed but layout was not set on it.
+
+			   - err == 0, which means directory exists and
+			     has an old layout piece which will be
+			     overwritten now.
+
+			   - err == ENOENT, which means directory does
+			     not exist (possibly racing with mkdir or
+			     finishing half done mkdir). The missing
+			     directory will be attempted to be recreated.
+
+			     It is important to note that it is safe
+			     to race with mkdir() as self-heal and
+			     mkdir are idempotent operations. Both will
+			     strive to set the directory and layouts to
+			     the same final state.
+			*/
                         count++;
+			if (!err)
+				layout->list[i].err = -1;
                 }
         }
 
@@ -604,7 +653,7 @@ dht_selfheal_layout_maximize_overlap (call_frame_t *frame, loc_t *loc,
         if (!table) {
                 return;
         }
-        memset(table,0,sizeof(overlap)*new->cnt*new->cnt);
+        memset(table,0,sizeof(overlap)*old->cnt*new->cnt);
         for (i = 0; i < new->cnt; ++i) {
                 for (j = 0; j < old->cnt; ++j) {
                         OV_ENTRY(i,j) = dht_overlap_calc(old,j,new,i);
@@ -623,6 +672,13 @@ dht_selfheal_layout_maximize_overlap (call_frame_t *frame, loc_t *loc,
                 max_overlap = 0;
                 max_overlap_idx = i;
                 for (j = (i + 1); j < new->cnt; ++j) {
+                        if (new->list[j].err > 0) {
+			        /* Subvol might be marked for decommission
+			        with EINVAL, or some other serious error
+			        marked with positive errno.
+			        */
+			        continue;
+                        }
                         /* Calculate the overlap now. */
                         curr_overlap = OV_ENTRY(i,i) + OV_ENTRY(j,j);
                         /* Calculate the overlap after the proposed swap. */
@@ -741,9 +797,11 @@ dht_selfheal_layout_new_directory (call_frame_t *frame, loc_t *loc,
 
         start_subvol = dht_selfheal_layout_alloc_start (this, loc, layout);
 
+        /* clear out the range, as we are re-computing here */
+        DHT_RESET_LAYOUT_RANGE (layout);
         for (i = start_subvol; i < layout->cnt; i++) {
                 err = layout->list[i].err;
-                if (err == -1) {
+                if (err == -1 || err == ENOENT) {
                         DHT_SET_LAYOUT_RANGE(layout, i, start, chunk,
                                              cnt, loc->path);
                         if (--cnt == 0) {
@@ -756,7 +814,7 @@ dht_selfheal_layout_new_directory (call_frame_t *frame, loc_t *loc,
 
         for (i = 0; i < start_subvol; i++) {
                 err = layout->list[i].err;
-                if (err == -1) {
+                if (err == -1 || err == ENOENT) {
                         DHT_SET_LAYOUT_RANGE(layout, i, start, chunk,
                                              cnt, loc->path);
                         if (--cnt == 0) {
diff --git a/xlators/cluster/dht/src/dht-shared.c b/xlators/cluster/dht/src/dht-shared.c
new file mode 100644
index 000000000..70aac7710
--- /dev/null
+++ b/xlators/cluster/dht/src/dht-shared.c
@@ -0,0 +1,758 @@
+/*
+  Copyright (c) 2008-2012 Red Hat, Inc. <http://www.redhat.com>
+  This file is part of GlusterFS.
+
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
+*/
+
+
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+
+/* TODO: add NS locking */
+
+#include "statedump.h"
+#include "dht-common.h"
+
+/* TODO:
+   - use volumename in xattr instead of "dht"
+   - use NS locks
+   - handle all cases in self heal layout reconstruction
+   - complete linkfile selfheal
+*/
+struct volume_options options[];
+
+void
+dht_layout_dump (dht_layout_t  *layout, const char *prefix)
+{
+
+        char    key[GF_DUMP_MAX_BUF_LEN];
+        int     i = 0;
+
+        if (!layout)
+                goto out;
+        if (!prefix)
+                goto out;
+
+        gf_proc_dump_build_key(key, prefix, "cnt");
+        gf_proc_dump_write(key, "%d", layout->cnt);
+        gf_proc_dump_build_key(key, prefix, "preset");
+        gf_proc_dump_write(key, "%d", layout->preset);
+        gf_proc_dump_build_key(key, prefix, "gen");
+        gf_proc_dump_write(key, "%d", layout->gen);
+        if (layout->type != IA_INVAL) {
+                gf_proc_dump_build_key(key, prefix, "inode type");
+                gf_proc_dump_write(key, "%d", layout->type);
+        }
+
+        if  (!IA_ISDIR (layout->type))
+                goto out;
+
+        for (i = 0; i < layout->cnt; i++) {
+                gf_proc_dump_build_key(key, prefix,"list[%d].err", i);
+                gf_proc_dump_write(key, "%d", layout->list[i].err);
+                gf_proc_dump_build_key(key, prefix,"list[%d].start", i);
+                gf_proc_dump_write(key, "%u", layout->list[i].start);
+                gf_proc_dump_build_key(key, prefix,"list[%d].stop", i);
+                gf_proc_dump_write(key, "%u", layout->list[i].stop);
+                if (layout->list[i].xlator) {
+                        gf_proc_dump_build_key(key, prefix,
+                                               "list[%d].xlator.type", i);
+                        gf_proc_dump_write(key, "%s",
+                                           layout->list[i].xlator->type);
+                        gf_proc_dump_build_key(key, prefix,
+                                               "list[%d].xlator.name", i);
+                        gf_proc_dump_write(key, "%s",
+                                           layout->list[i].xlator->name);
+                }
+        }
+
+out:
+        return;
+}
+
+
+int32_t
+dht_priv_dump (xlator_t *this)
+{
+        char            key_prefix[GF_DUMP_MAX_BUF_LEN];
+        char            key[GF_DUMP_MAX_BUF_LEN];
+        int             i = 0;
+        dht_conf_t      *conf = NULL;
+        int             ret = -1;
+
+        if (!this)
+                goto out;
+
+        conf = this->private;
+        if (!conf)
+                goto out;
+
+        ret = TRY_LOCK(&conf->subvolume_lock);
+        if (ret != 0) {
+                return ret;
+        }
+
+        gf_proc_dump_add_section("xlator.cluster.dht.%s.priv", this->name);
+        gf_proc_dump_build_key(key_prefix,"xlator.cluster.dht","%s.priv",
+                               this->name);
+        gf_proc_dump_write("subvol_cnt","%d", conf->subvolume_cnt);
+        for (i = 0; i < conf->subvolume_cnt; i++) {
+                sprintf (key, "subvolumes[%d]", i);
+                gf_proc_dump_write(key, "%s.%s", conf->subvolumes[i]->type,
+                                   conf->subvolumes[i]->name);
+                if (conf->file_layouts && conf->file_layouts[i]){
+                        sprintf (key, "file_layouts[%d]", i);
+                        dht_layout_dump(conf->file_layouts[i], key);
+                }
+                if (conf->dir_layouts && conf->dir_layouts[i]) {
+                        sprintf (key, "dir_layouts[%d]", i);
+                        dht_layout_dump(conf->dir_layouts[i], key);
+                }
+                if (conf->subvolume_status) {
+
+                        sprintf (key, "subvolume_status[%d]", i);
+                        gf_proc_dump_write(key, "%d",
+                                           (int)conf->subvolume_status[i]);
+                }
+
+        }
+
+        gf_proc_dump_write("search_unhashed", "%d", conf->search_unhashed);
+        gf_proc_dump_write("gen", "%d", conf->gen);
+        gf_proc_dump_write("min_free_disk", "%lf", conf->min_free_disk);
+	gf_proc_dump_write("min_free_inodes", "%lf", conf->min_free_inodes);
+        gf_proc_dump_write("disk_unit", "%c", conf->disk_unit);
+        gf_proc_dump_write("refresh_interval", "%d", conf->refresh_interval);
+        gf_proc_dump_write("unhashed_sticky_bit", "%d", conf->unhashed_sticky_bit);
+        if (conf ->du_stats) {
+                gf_proc_dump_write("du_stats.avail_percent", "%lf",
+                                   conf->du_stats->avail_percent);
+                gf_proc_dump_write("du_stats.avail_space", "%lu",
+                                   conf->du_stats->avail_space);
+		gf_proc_dump_write("du_stats.avail_inodes", "%lf",
+                                   conf->du_stats->avail_inodes);
+                gf_proc_dump_write("du_stats.log", "%lu", conf->du_stats->log);
+        }
+
+        if (conf->last_stat_fetch.tv_sec)
+                gf_proc_dump_write("last_stat_fetch", "%s",
+                                    ctime(&conf->last_stat_fetch.tv_sec));
+
+        UNLOCK(&conf->subvolume_lock);
+
+out:
+        return ret;
+}
+
+int32_t
+dht_inodectx_dump (xlator_t *this, inode_t *inode)
+{
+        int             ret = -1;
+        dht_layout_t    *layout = NULL;
+
+        if (!this)
+                goto out;
+        if (!inode)
+                goto out;
+
+        ret = dht_inode_ctx_layout_get (inode, this, &layout);
+
+        if ((ret != 0) || !layout)
+                return ret;
+
+        gf_proc_dump_add_section("xlator.cluster.dht.%s.inode", this->name);
+        dht_layout_dump(layout, "layout");
+
+out:
+        return ret;
+}
+
+void
+dht_fini (xlator_t *this)
+{
+        int         i = 0;
+        dht_conf_t *conf = NULL;
+
+        GF_VALIDATE_OR_GOTO ("dht", this, out);
+
+        conf = this->private;
+        this->private = NULL;
+        if (conf) {
+                if (conf->file_layouts) {
+                        for (i = 0; i < conf->subvolume_cnt; i++) {
+                                GF_FREE (conf->file_layouts[i]);
+                        }
+                        GF_FREE (conf->file_layouts);
+                }
+
+                GF_FREE (conf->subvolumes);
+
+                GF_FREE (conf->subvolume_status);
+
+                GF_FREE (conf);
+        }
+out:
+        return;
+}
+
+int32_t
+mem_acct_init (xlator_t *this)
+{
+        int     ret = -1;
+
+        GF_VALIDATE_OR_GOTO ("dht", this, out);
+
+        ret = xlator_mem_acct_init (this, gf_dht_mt_end + 1);
+
+        if (ret != 0) {
+                gf_log (this->name, GF_LOG_ERROR, "Memory accounting init"
+                        "failed");
+                return ret;
+        }
+out:
+        return ret;
+}
+
+
+int
+dht_parse_decommissioned_bricks (xlator_t *this, dht_conf_t *conf,
+                                 const char *bricks)
+{
+        int         i  = 0;
+        int         ret  = -1;
+        char       *tmpstr = NULL;
+        char       *dup_brick = NULL;
+        char       *node = NULL;
+
+        if (!conf || !bricks)
+                goto out;
+
+        dup_brick = gf_strdup (bricks);
+        node = strtok_r (dup_brick, ",", &tmpstr);
+        while (node) {
+                for (i = 0; i < conf->subvolume_cnt; i++) {
+                        if (!strcmp (conf->subvolumes[i]->name, node)) {
+                                conf->decommissioned_bricks[i] =
+                                        conf->subvolumes[i];
+                                        conf->decommission_subvols_cnt++;
+                                gf_log (this->name, GF_LOG_INFO,
+                                        "decommissioning subvolume %s",
+                                        conf->subvolumes[i]->name);
+                                break;
+                        }
+                }
+                if (i == conf->subvolume_cnt) {
+                        /* Wrong node given. */
+                        goto out;
+                }
+                node = strtok_r (NULL, ",", &tmpstr);
+        }
+
+        ret = 0;
+        conf->decommission_in_progress = 1;
+out:
+        GF_FREE (dup_brick);
+
+        return ret;
+}
+
+
+int
+dht_decommissioned_remove (xlator_t *this, dht_conf_t *conf)
+{
+        int         i  = 0;
+        int         ret  = -1;
+
+        if (!conf)
+                goto out;
+
+        for (i = 0; i < conf->subvolume_cnt; i++) {
+                if (conf->decommissioned_bricks[i]) {
+                        conf->decommissioned_bricks[i] = NULL;
+                        conf->decommission_subvols_cnt--;
+                }
+        }
+
+        ret = 0;
+out:
+
+        return ret;
+}
+void
+dht_init_regex (xlator_t *this, dict_t *odict, char *name,
+                regex_t *re, gf_boolean_t *re_valid)
+{
+        char    *temp_str;
+
+        if (dict_get_str (odict, name, &temp_str) != 0) {
+                if (strcmp(name,"rsync-hash-regex")) {
+                        return;
+                }
+                temp_str = "^\\.(.+)\\.[^.]+$";
+        }
+
+        if (*re_valid) {
+                regfree(re);
+                *re_valid = _gf_false;
+        }
+
+        if (!strcmp(temp_str,"none")) {
+                return;
+        }
+
+        if (regcomp(re,temp_str,REG_EXTENDED) == 0) {
+                gf_log (this->name, GF_LOG_INFO,
+                        "using regex %s = %s", name, temp_str);
+                *re_valid = _gf_true;
+        }
+        else {
+                gf_log (this->name, GF_LOG_WARNING,
+                        "compiling regex %s failed", temp_str);
+        }
+}
+
+int
+dht_reconfigure (xlator_t *this, dict_t *options)
+{
+        dht_conf_t      *conf = NULL;
+        char            *temp_str = NULL;
+        gf_boolean_t     search_unhashed;
+        int              ret = -1;
+
+        GF_VALIDATE_OR_GOTO ("dht", this, out);
+        GF_VALIDATE_OR_GOTO ("dht", options, out);
+
+        conf = this->private;
+        if (!conf)
+                return 0;
+
+        if (dict_get_str (options, "lookup-unhashed", &temp_str) == 0) {
+                /* If option is not "auto", other options _should_ be boolean*/
+                if (strcasecmp (temp_str, "auto")) {
+                        if (!gf_string2boolean (temp_str, &search_unhashed)) {
+                                gf_log(this->name, GF_LOG_DEBUG, "Reconfigure:"
+                                       " lookup-unhashed reconfigured (%s)",
+                                       temp_str);
+                                conf->search_unhashed = search_unhashed;
+                        } else {
+                                gf_log(this->name, GF_LOG_ERROR, "Reconfigure:"
+                                       " lookup-unhashed should be boolean,"
+                                       " not (%s), defaulting to (%d)",
+                                       temp_str, conf->search_unhashed);
+                                //return -1;
+                                ret = -1;
+                                goto out;
+                        }
+                } else {
+                        gf_log(this->name, GF_LOG_DEBUG, "Reconfigure:"
+                               " lookup-unhashed reconfigured auto ");
+                        conf->search_unhashed = GF_DHT_LOOKUP_UNHASHED_AUTO;
+                }
+        }
+
+	GF_OPTION_RECONF ("min-free-disk", conf->min_free_disk, options,
+                          percent_or_size, out);
+        /* option can be any one of percent or bytes */
+        conf->disk_unit = 0;
+        if (conf->min_free_disk < 100.0)
+                conf->disk_unit = 'p';
+
+	GF_OPTION_RECONF ("min-free-inodes", conf->min_free_inodes, options,
+                          percent, out);
+
+        GF_OPTION_RECONF ("directory-layout-spread", conf->dir_spread_cnt,
+                          options, uint32, out);
+
+        GF_OPTION_RECONF ("readdir-optimize", conf->readdir_optimize, options,
+                          bool, out);
+        if (conf->defrag) {
+                GF_OPTION_RECONF ("rebalance-stats", conf->defrag->stats,
+                                  options, bool, out);
+        }
+
+        if (dict_get_str (options, "decommissioned-bricks", &temp_str) == 0) {
+                ret = dht_parse_decommissioned_bricks (this, conf, temp_str);
+                if (ret == -1)
+                        goto out;
+        } else {
+                ret = dht_decommissioned_remove (this, conf);
+                if (ret == -1)
+                        goto out;
+        }
+
+        dht_init_regex (this, options, "rsync-hash-regex",
+                        &conf->rsync_regex, &conf->rsync_regex_valid);
+        dht_init_regex (this, options, "extra-hash-regex",
+                        &conf->extra_regex, &conf->extra_regex_valid);
+
+        ret = 0;
+out:
+        return ret;
+}
+
+static int
+gf_defrag_pattern_list_fill (xlator_t *this, gf_defrag_info_t *defrag, char *data)
+{
+        int                    ret = -1;
+        char                  *tmp_str = NULL;
+        char                  *tmp_str1 = NULL;
+        char                  *dup_str = NULL;
+        char                  *num = NULL;
+        char                  *pattern_str = NULL;
+        char                  *pattern = NULL;
+        gf_defrag_pattern_list_t *temp_list = NULL;
+        gf_defrag_pattern_list_t *pattern_list = NULL;
+
+        if (!this || !defrag || !data)
+                goto out;
+
+        /* Get the pattern for pattern list. "pattern:<optional-size>"
+         * eg: *avi, *pdf:10MB, *:1TB
+         */
+        pattern_str = strtok_r (data, ",", &tmp_str);
+        while (pattern_str) {
+                dup_str = gf_strdup (pattern_str);
+                pattern_list = GF_CALLOC (1, sizeof (gf_defrag_pattern_list_t),
+                                        1);
+                if (!pattern_list) {
+                        goto out;
+                }
+                pattern = strtok_r (dup_str, ":", &tmp_str1);
+                num = strtok_r (NULL, ":", &tmp_str1);
+                if (!pattern)
+                        goto out;
+                if (!num) {
+                        if (gf_string2bytesize(pattern, &pattern_list->size)
+                             == 0) {
+                                pattern = "*";
+                        }
+                } else if (gf_string2bytesize (num, &pattern_list->size) != 0) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "invalid number format \"%s\"", num);
+                        goto out;
+                }
+                memcpy (pattern_list->path_pattern, pattern, strlen (dup_str));
+
+                if (!defrag->defrag_pattern)
+                        temp_list = NULL;
+                else
+                        temp_list = defrag->defrag_pattern;
+
+                pattern_list->next = temp_list;
+
+                defrag->defrag_pattern = pattern_list;
+                pattern_list = NULL;
+
+                GF_FREE (dup_str);
+                dup_str = NULL;
+
+                pattern_str = strtok_r (NULL, ",", &tmp_str);
+        }
+
+        ret = 0;
+out:
+        if (ret)
+                GF_FREE (pattern_list);
+        GF_FREE (dup_str);
+
+        return ret;
+}
+
+int
+dht_init (xlator_t *this)
+{
+        dht_conf_t                      *conf           = NULL;
+        char                            *temp_str       = NULL;
+        int                              ret            = -1;
+        int                              i              = 0;
+        gf_defrag_info_t                *defrag         = NULL;
+        int                              cmd            = 0;
+        char                            *node_uuid      = NULL;
+
+
+        GF_VALIDATE_OR_GOTO ("dht", this, err);
+
+        if (!this->children) {
+                gf_log (this->name, GF_LOG_CRITICAL,
+                        "Distribute needs more than one subvolume");
+                return -1;
+        }
+
+        if (!this->parents) {
+                gf_log (this->name, GF_LOG_WARNING,
+                        "dangling volume. check volfile");
+        }
+
+        conf = GF_CALLOC (1, sizeof (*conf), gf_dht_mt_dht_conf_t);
+        if (!conf) {
+                goto err;
+        }
+
+        ret = dict_get_int32 (this->options, "rebalance-cmd", &cmd);
+
+        if (cmd) {
+                defrag = GF_CALLOC (1, sizeof (gf_defrag_info_t),
+                                    gf_defrag_info_mt);
+
+                GF_VALIDATE_OR_GOTO (this->name, defrag, err);
+
+                LOCK_INIT (&defrag->lock);
+
+                defrag->is_exiting = 0;
+
+                conf->defrag = defrag;
+
+                ret = dict_get_str (this->options, "node-uuid", &node_uuid);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR, "node-uuid not "
+                                "specified");
+                        goto err;
+                }
+
+                if (uuid_parse (node_uuid, defrag->node_uuid)) {
+                        gf_log (this->name, GF_LOG_ERROR, "Cannot parse "
+                                "glusterd node uuid");
+                        goto err;
+                }
+
+                defrag->cmd = cmd;
+
+                defrag->stats = _gf_false;
+        }
+
+        conf->search_unhashed = GF_DHT_LOOKUP_UNHASHED_ON;
+        if (dict_get_str (this->options, "lookup-unhashed", &temp_str) == 0) {
+                /* If option is not "auto", other options _should_ be boolean */
+                if (strcasecmp (temp_str, "auto"))
+                        gf_string2boolean (temp_str, &conf->search_unhashed);
+                else
+                        conf->search_unhashed = GF_DHT_LOOKUP_UNHASHED_AUTO;
+        }
+
+        GF_OPTION_INIT ("unhashed-sticky-bit", conf->unhashed_sticky_bit, bool,
+                        err);
+
+        GF_OPTION_INIT ("use-readdirp", conf->use_readdirp, bool, err);
+
+	GF_OPTION_INIT ("min-free-disk", conf->min_free_disk, percent_or_size,
+			err);
+
+        GF_OPTION_INIT ("min-free-inodes", conf->min_free_inodes, percent,
+                        err);
+
+        conf->dir_spread_cnt = conf->subvolume_cnt;
+        GF_OPTION_INIT ("directory-layout-spread", conf->dir_spread_cnt,
+                        uint32, err);
+
+        GF_OPTION_INIT ("assert-no-child-down", conf->assert_no_child_down,
+                        bool, err);
+
+        GF_OPTION_INIT ("readdir-optimize", conf->readdir_optimize, bool, err);
+
+        if (defrag) {
+                GF_OPTION_INIT ("rebalance-stats", defrag->stats, bool, err);
+                if (dict_get_str (this->options, "rebalance-filter", &temp_str)
+                    == 0) {
+                        if (gf_defrag_pattern_list_fill (this, defrag, temp_str)
+                            == -1) {
+                                gf_log (this->name, GF_LOG_ERROR, "Cannot parse"
+                                        " rebalance-filter (%s)", temp_str);
+                                goto err;
+                        }
+                }
+        }
+
+        /* option can be any one of percent or bytes */
+        conf->disk_unit = 0;
+        if (conf->min_free_disk < 100)
+                conf->disk_unit = 'p';
+
+        ret = dht_init_subvolumes (this, conf);
+        if (ret == -1) {
+                goto err;
+        }
+
+        if (dict_get_str (this->options, "decommissioned-bricks", &temp_str) == 0) {
+                ret = dht_parse_decommissioned_bricks (this, conf, temp_str);
+                if (ret == -1)
+                        goto err;
+        }
+
+        dht_init_regex (this, this->options, "rsync-hash-regex",
+                        &conf->rsync_regex, &conf->rsync_regex_valid);
+        dht_init_regex (this, this->options, "extra-hash-regex",
+                        &conf->extra_regex, &conf->extra_regex_valid);
+
+        ret = dht_layouts_init (this, conf);
+        if (ret == -1) {
+                goto err;
+        }
+
+        LOCK_INIT (&conf->subvolume_lock);
+        LOCK_INIT (&conf->layout_lock);
+
+        conf->gen = 1;
+
+        this->local_pool = mem_pool_new (dht_local_t, 512);
+        if (!this->local_pool) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "failed to create local_t's memory pool");
+                goto err;
+        }
+
+        GF_OPTION_INIT ("xattr-name", conf->xattr_name, str, err);
+        gf_asprintf (&conf->link_xattr_name, "%s.linkto", conf->xattr_name);
+        gf_asprintf (&conf->wild_xattr_name, "%s*", conf->xattr_name);
+        if (!conf->link_xattr_name || !conf->wild_xattr_name) {
+                goto err;
+        }
+
+        this->private = conf;
+
+        return 0;
+
+err:
+        if (conf) {
+                if (conf->file_layouts) {
+                        for (i = 0; i < conf->subvolume_cnt; i++) {
+                                GF_FREE (conf->file_layouts[i]);
+                        }
+                        GF_FREE (conf->file_layouts);
+                }
+
+                GF_FREE (conf->subvolumes);
+
+                GF_FREE (conf->subvolume_status);
+
+                GF_FREE (conf->du_stats);
+
+                GF_FREE (conf->defrag);
+
+                GF_FREE (conf->xattr_name);
+                GF_FREE (conf->link_xattr_name);
+                GF_FREE (conf->wild_xattr_name);
+
+                GF_FREE (conf);
+        }
+
+        return -1;
+}
+
+
+struct volume_options options[] = {
+        { .key  = {"lookup-unhashed"},
+          .value = {"auto", "yes", "no", "enable", "disable", "1", "0",
+                    "on", "off"},
+          .type = GF_OPTION_TYPE_STR,
+          .default_value = "on",
+          .description = "This option if set to ON, does a lookup through "
+          "all the sub-volumes, in case a lookup didn't return any result "
+          "from the hash subvolume. If set to OFF, it does not do a lookup "
+          "on the remaining subvolumes."
+        },
+        { .key  = {"min-free-disk"},
+          .type = GF_OPTION_TYPE_PERCENT_OR_SIZET,
+          .default_value = "10%",
+          .description = "Percentage/Size of disk space, after which the "
+          "process starts balancing out the cluster, and logs will appear "
+          "in log files",
+        },
+	{ .key  = {"min-free-inodes"},
+          .type = GF_OPTION_TYPE_PERCENT,
+          .default_value = "5%",
+          .description = "after system has only N% of inodes, warnings "
+          "starts to appear in log files",
+        },
+        { .key = {"unhashed-sticky-bit"},
+          .type = GF_OPTION_TYPE_BOOL,
+          .default_value = "off",
+        },
+        { .key = {"use-readdirp"},
+          .type = GF_OPTION_TYPE_BOOL,
+          .default_value = "on",
+          .description = "This option if set to ON, forces the use of "
+          "readdirp, and hence also displays the stats of the files."
+        },
+        { .key = {"assert-no-child-down"},
+          .type = GF_OPTION_TYPE_BOOL,
+          .default_value = "off",
+          .description = "This option if set to ON, in the event of "
+          "CHILD_DOWN, will call exit."
+        },
+        { .key  = {"directory-layout-spread"},
+          .type = GF_OPTION_TYPE_INT,
+          .min  = 1,
+          .validate = GF_OPT_VALIDATE_MIN,
+          .description = "Specifies the directory layout spread."
+        },
+        { .key  = {"decommissioned-bricks"},
+          .type = GF_OPTION_TYPE_ANY,
+          .description = "This option if set to ON, decommissions "
+          "the brick, so that no new data is allowed to be created "
+          "on that brick."
+        },
+        { .key  = {"rebalance-cmd"},
+          .type = GF_OPTION_TYPE_INT,
+        },
+        { .key = {"node-uuid"},
+          .type = GF_OPTION_TYPE_STR,
+        },
+        { .key = {"rebalance-stats"},
+          .type = GF_OPTION_TYPE_BOOL,
+          .default_value = "off",
+          .description = "This option if set to ON displays and logs the "
+          " time taken for migration of each file, during the rebalance "
+          "process. If set to OFF, the rebalance logs will only display the "
+          "time spent in each directory."
+        },
+        { .key = {"readdir-optimize"},
+          .type = GF_OPTION_TYPE_BOOL,
+          .default_value = "off",
+          .description = "This option if set to ON enables the optimization "
+          "that allows DHT to requests non-first subvolumes to filter out "
+          "directory entries."
+        },
+        { .key = {"rsync-hash-regex"},
+          .type = GF_OPTION_TYPE_STR,
+          /* Setting a default here doesn't work.  See dht_init_regex. */
+          .description = "Regular expression for stripping temporary-file "
+          "suffix and prefix used by rsync, to prevent relocation when the "
+          "file is renamed."
+        },
+        { .key = {"extra-hash-regex"},
+          .type = GF_OPTION_TYPE_STR,
+          /* Setting a default here doesn't work.  See dht_init_regex. */
+          .description = "Regular expression for stripping temporary-file "
+          "suffix and prefix used by an application, to prevent relocation when "
+          "the file is renamed."
+        },
+        { .key = {"rebalance-filter"},
+          .type = GF_OPTION_TYPE_STR,
+        },
+
+        { .key = {"xattr-name"},
+          .type = GF_OPTION_TYPE_STR,
+          .default_value = "trusted.glusterfs.dht",
+          .description = "Base for extended attributes used by this "
+          "translator instance, to avoid conflicts with others above or "
+          "below it."
+        },
+
+        /* NUFA option */
+        { .key  = {"local-volume-name"},
+          .type = GF_OPTION_TYPE_XLATOR
+        },
+
+        /* switch option */
+        { .key  = {"pattern.switch.case"},
+          .type = GF_OPTION_TYPE_ANY
+        },
+
+        { .key  = {NULL} },
+};
diff --git a/xlators/cluster/dht/src/dht.c b/xlators/cluster/dht/src/dht.c
index 14f3eb1d1..fc0ca2f77 100644
--- a/xlators/cluster/dht/src/dht.c
+++ b/xlators/cluster/dht/src/dht.c
@@ -14,621 +14,15 @@
 #include "config.h"
 #endif
 
-/* TODO: add NS locking */
-
 #include "statedump.h"
 #include "dht-common.h"
 
-/* TODO:
-   - use volumename in xattr instead of "dht"
-   - use NS locks
-   - handle all cases in self heal layout reconstruction
-   - complete linkfile selfheal
-*/
-struct volume_options options[];
-
-void
-dht_layout_dump (dht_layout_t  *layout, const char *prefix)
-{
-
-        char    key[GF_DUMP_MAX_BUF_LEN];
-        int     i = 0;
-
-        if (!layout)
-                goto out;
-        if (!prefix)
-                goto out;
-
-        gf_proc_dump_build_key(key, prefix, "cnt");
-        gf_proc_dump_write(key, "%d", layout->cnt);
-        gf_proc_dump_build_key(key, prefix, "preset");
-        gf_proc_dump_write(key, "%d", layout->preset);
-        gf_proc_dump_build_key(key, prefix, "gen");
-        gf_proc_dump_write(key, "%d", layout->gen);
-        if (layout->type != IA_INVAL) {
-                gf_proc_dump_build_key(key, prefix, "inode type");
-                gf_proc_dump_write(key, "%d", layout->type);
-        }
-
-        if  (!IA_ISDIR (layout->type))
-                goto out;
-
-        for (i = 0; i < layout->cnt; i++) {
-                gf_proc_dump_build_key(key, prefix,"list[%d].err", i);
-                gf_proc_dump_write(key, "%d", layout->list[i].err);
-                gf_proc_dump_build_key(key, prefix,"list[%d].start", i);
-                gf_proc_dump_write(key, "%u", layout->list[i].start);
-                gf_proc_dump_build_key(key, prefix,"list[%d].stop", i);
-                gf_proc_dump_write(key, "%u", layout->list[i].stop);
-                if (layout->list[i].xlator) {
-                        gf_proc_dump_build_key(key, prefix,
-                                               "list[%d].xlator.type", i);
-                        gf_proc_dump_write(key, "%s",
-                                           layout->list[i].xlator->type);
-                        gf_proc_dump_build_key(key, prefix,
-                                               "list[%d].xlator.name", i);
-                        gf_proc_dump_write(key, "%s",
-                                           layout->list[i].xlator->name);
-                }
-        }
-
-out:
-        return;
-}
-
-
-int32_t
-dht_priv_dump (xlator_t *this)
-{
-        char            key_prefix[GF_DUMP_MAX_BUF_LEN];
-        char            key[GF_DUMP_MAX_BUF_LEN];
-        int             i = 0;
-        dht_conf_t      *conf = NULL;
-        int             ret = -1;
-
-        if (!this)
-                goto out;
-
-        conf = this->private;
-        if (!conf)
-                goto out;
-
-        ret = TRY_LOCK(&conf->subvolume_lock);
-        if (ret != 0) {
-                return ret;
-        }
-
-        gf_proc_dump_add_section("xlator.cluster.dht.%s.priv", this->name);
-        gf_proc_dump_build_key(key_prefix,"xlator.cluster.dht","%s.priv",
-                               this->name);
-        gf_proc_dump_write("subvol_cnt","%d", conf->subvolume_cnt);
-        for (i = 0; i < conf->subvolume_cnt; i++) {
-                sprintf (key, "subvolumes[%d]", i);
-                gf_proc_dump_write(key, "%s.%s", conf->subvolumes[i]->type,
-                                   conf->subvolumes[i]->name);
-                if (conf->file_layouts && conf->file_layouts[i]){
-                        sprintf (key, "file_layouts[%d]", i);
-                        dht_layout_dump(conf->file_layouts[i], key);
-                }
-                if (conf->dir_layouts && conf->dir_layouts[i]) {
-                        sprintf (key, "dir_layouts[%d]", i);
-                        dht_layout_dump(conf->dir_layouts[i], key);
-                }
-                if (conf->subvolume_status) {
-
-                        sprintf (key, "subvolume_status[%d]", i);
-                        gf_proc_dump_write(key, "%d",
-                                           (int)conf->subvolume_status[i]);
-                }
-
-        }
-
-        gf_proc_dump_write("search_unhashed", "%d", conf->search_unhashed);
-        gf_proc_dump_write("gen", "%d", conf->gen);
-        gf_proc_dump_write("min_free_disk", "%lf", conf->min_free_disk);
-	gf_proc_dump_write("min_free_inodes", "%lf", conf->min_free_inodes);
-        gf_proc_dump_write("disk_unit", "%c", conf->disk_unit);
-        gf_proc_dump_write("refresh_interval", "%d", conf->refresh_interval);
-        gf_proc_dump_write("unhashed_sticky_bit", "%d", conf->unhashed_sticky_bit);
-        if (conf ->du_stats) {
-                gf_proc_dump_write("du_stats.avail_percent", "%lf",
-                                   conf->du_stats->avail_percent);
-                gf_proc_dump_write("du_stats.avail_space", "%lu",
-                                   conf->du_stats->avail_space);
-		gf_proc_dump_write("du_stats.avail_inodes", "%lf",
-                                   conf->du_stats->avail_inodes);
-                gf_proc_dump_write("du_stats.log", "%lu", conf->du_stats->log);
-        }
-
-        if (conf->last_stat_fetch.tv_sec)
-                gf_proc_dump_write("last_stat_fetch", "%s",
-                                    ctime(&conf->last_stat_fetch.tv_sec));
-
-        UNLOCK(&conf->subvolume_lock);
-
-out:
-        return ret;
-}
-
-int32_t
-dht_inodectx_dump (xlator_t *this, inode_t *inode)
-{
-        int             ret = -1;
-        dht_layout_t    *layout = NULL;
-
-        if (!this)
-                goto out;
-        if (!inode)
-                goto out;
-
-        ret = dht_inode_ctx_layout_get (inode, this, &layout);
-
-        if ((ret != 0) || !layout)
-                return ret;
-
-        gf_proc_dump_add_section("xlator.cluster.dht.%s.inode", this->name);
-        dht_layout_dump(layout, "layout");
-
-out:
-        return ret;
-}
-
-int
-notify (xlator_t *this, int event, void *data, ...)
-{
-        int              ret = -1;
-        va_list          ap;
-        dict_t          *output = NULL;
-
-        GF_VALIDATE_OR_GOTO ("dht", this, out);
-
-
-        if (!data)
-                goto out;
-
-        va_start (ap, data);
-        output = va_arg (ap, dict_t*);
-
-        ret = dht_notify (this, event, data, output);
-
-out:
-        return ret;
-}
-
-void
-fini (xlator_t *this)
-{
-        int         i = 0;
-        dht_conf_t *conf = NULL;
-
-        GF_VALIDATE_OR_GOTO ("dht", this, out);
-
-        conf = this->private;
-        this->private = NULL;
-        if (conf) {
-                if (conf->file_layouts) {
-                        for (i = 0; i < conf->subvolume_cnt; i++) {
-                                GF_FREE (conf->file_layouts[i]);
-                        }
-                        GF_FREE (conf->file_layouts);
-                }
-
-                GF_FREE (conf->subvolumes);
-
-                GF_FREE (conf->subvolume_status);
-
-                GF_FREE (conf);
-        }
-out:
-        return;
-}
-
-int32_t
-mem_acct_init (xlator_t *this)
-{
-        int     ret = -1;
-
-        GF_VALIDATE_OR_GOTO ("dht", this, out);
-
-        ret = xlator_mem_acct_init (this, gf_dht_mt_end + 1);
-
-        if (ret != 0) {
-                gf_log (this->name, GF_LOG_ERROR, "Memory accounting init"
-                        "failed");
-                return ret;
-        }
-out:
-        return ret;
-}
-
-
-int
-dht_parse_decommissioned_bricks (xlator_t *this, dht_conf_t *conf,
-                                 const char *bricks)
-{
-        int         i  = 0;
-        int         ret  = -1;
-        char       *tmpstr = NULL;
-        char       *dup_brick = NULL;
-        char       *node = NULL;
-
-        if (!conf || !bricks)
-                goto out;
-
-        dup_brick = gf_strdup (bricks);
-        node = strtok_r (dup_brick, ",", &tmpstr);
-        while (node) {
-                for (i = 0; i < conf->subvolume_cnt; i++) {
-                        if (!strcmp (conf->subvolumes[i]->name, node)) {
-                                conf->decommissioned_bricks[i] =
-                                        conf->subvolumes[i];
-                                        conf->decommission_subvols_cnt++;
-                                gf_log (this->name, GF_LOG_INFO,
-                                        "decommissioning subvolume %s",
-                                        conf->subvolumes[i]->name);
-                                break;
-                        }
-                }
-                if (i == conf->subvolume_cnt) {
-                        /* Wrong node given. */
-                        goto out;
-                }
-                node = strtok_r (NULL, ",", &tmpstr);
-        }
-
-        ret = 0;
-        conf->decommission_in_progress = 1;
-out:
-        GF_FREE (dup_brick);
-
-        return ret;
-}
-
-void
-dht_init_regex (xlator_t *this, dict_t *odict, char *name,
-                regex_t *re, gf_boolean_t *re_valid)
-{
-        char    *temp_str;
-
-        if (dict_get_str (odict, name, &temp_str) != 0) {
-                if (strcmp(name,"rsync-hash-regex")) {
-                        return;
-                }
-                temp_str = "^\\.(.+)\\.[^.]+$";
-        }
-
-        if (*re_valid) {
-                regfree(re);
-                *re_valid = _gf_false;
-        }
-
-        if (!strcmp(temp_str,"none")) {
-                return;
-        }
-
-        if (regcomp(re,temp_str,REG_EXTENDED) == 0) {
-                gf_log (this->name, GF_LOG_INFO,
-                        "using regex %s = %s", name, temp_str);
-                *re_valid = _gf_true;
-        }
-        else {
-                gf_log (this->name, GF_LOG_WARNING,
-                        "compiling regex %s failed", temp_str);
-        }
-}
-
-int
-reconfigure (xlator_t *this, dict_t *options)
-{
-        dht_conf_t      *conf = NULL;
-        char            *temp_str = NULL;
-        gf_boolean_t     search_unhashed;
-        int              ret = -1;
-
-        GF_VALIDATE_OR_GOTO ("dht", this, out);
-        GF_VALIDATE_OR_GOTO ("dht", options, out);
-
-        conf = this->private;
-        if (!conf)
-                return 0;
-
-        if (dict_get_str (options, "lookup-unhashed", &temp_str) == 0) {
-                /* If option is not "auto", other options _should_ be boolean*/
-                if (strcasecmp (temp_str, "auto")) {
-                        if (!gf_string2boolean (temp_str, &search_unhashed)) {
-                                gf_log(this->name, GF_LOG_DEBUG, "Reconfigure:"
-                                       " lookup-unhashed reconfigured (%s)",
-                                       temp_str);
-                                conf->search_unhashed = search_unhashed;
-                        } else {
-                                gf_log(this->name, GF_LOG_ERROR, "Reconfigure:"
-                                       " lookup-unhashed should be boolean,"
-                                       " not (%s), defaulting to (%d)",
-                                       temp_str, conf->search_unhashed);
-                                //return -1;
-                                ret = -1;
-                                goto out;
-                        }
-                } else {
-                        gf_log(this->name, GF_LOG_DEBUG, "Reconfigure:"
-                               " lookup-unhashed reconfigured auto ");
-                        conf->search_unhashed = GF_DHT_LOOKUP_UNHASHED_AUTO;
-                }
-        }
-
-	GF_OPTION_RECONF ("min-free-disk", conf->min_free_disk, options,
-                          percent_or_size, out);
-        /* option can be any one of percent or bytes */
-        conf->disk_unit = 0;
-        if (conf->min_free_disk < 100.0)
-                conf->disk_unit = 'p';
-
-	GF_OPTION_RECONF ("min-free-inodes", conf->min_free_inodes, options,
-                          percent, out);
-
-        GF_OPTION_RECONF ("directory-layout-spread", conf->dir_spread_cnt,
-                          options, uint32, out);
-
-        GF_OPTION_RECONF ("readdir-optimize", conf->readdir_optimize, options,
-                          bool, out);
-        if (conf->defrag) {
-                GF_OPTION_RECONF ("rebalance-stats", conf->defrag->stats,
-                                  options, bool, out);
-        }
-
-        if (dict_get_str (options, "decommissioned-bricks", &temp_str) == 0) {
-                ret = dht_parse_decommissioned_bricks (this, conf, temp_str);
-                if (ret == -1)
-                        goto out;
-        }
-
-        dht_init_regex (this, options, "rsync-hash-regex",
-                        &conf->rsync_regex, &conf->rsync_regex_valid);
-        dht_init_regex (this, options, "extra-hash-regex",
-                        &conf->extra_regex, &conf->extra_regex_valid);
-
-        ret = 0;
-out:
-        return ret;
-}
-
-static int
-gf_defrag_pattern_list_fill (xlator_t *this, gf_defrag_info_t *defrag, char *data)
-{
-        int                    ret = -1;
-        char                  *tmp_str = NULL;
-        char                  *tmp_str1 = NULL;
-        char                  *dup_str = NULL;
-        char                  *num = NULL;
-        char                  *pattern_str = NULL;
-        char                  *pattern = NULL;
-        gf_defrag_pattern_list_t *temp_list = NULL;
-        gf_defrag_pattern_list_t *pattern_list = NULL;
-
-        if (!this || !defrag || !data)
-                goto out;
-
-        /* Get the pattern for pattern list. "pattern:<optional-size>"
-         * eg: *avi, *pdf:10MB, *:1TB
-         */
-        pattern_str = strtok_r (data, ",", &tmp_str);
-        while (pattern_str) {
-                dup_str = gf_strdup (pattern_str);
-                pattern_list = GF_CALLOC (1, sizeof (gf_defrag_pattern_list_t),
-                                        1);
-                if (!pattern_list) {
-                        goto out;
-                }
-                pattern = strtok_r (dup_str, ":", &tmp_str1);
-                num = strtok_r (NULL, ":", &tmp_str1);
-                if (!pattern)
-                        goto out;
-                if (!num) {
-                        if (gf_string2bytesize(pattern, &pattern_list->size)
-                             == 0) {
-                                pattern = "*";
-                        }
-                } else if (gf_string2bytesize (num, &pattern_list->size) != 0) {
-                        gf_log (this->name, GF_LOG_ERROR,
-                                "invalid number format \"%s\"", num);
-                        goto out;
-                }
-                memcpy (pattern_list->path_pattern, pattern, strlen (dup_str));
-
-                if (!defrag->defrag_pattern)
-                        temp_list = NULL;
-                else
-                        temp_list = defrag->defrag_pattern;
-
-                pattern_list->next = temp_list;
-
-                defrag->defrag_pattern = pattern_list;
-                pattern_list = NULL;
-
-                GF_FREE (dup_str);
-                dup_str = NULL;
-
-                pattern_str = strtok_r (NULL, ",", &tmp_str);
-        }
-
-        ret = 0;
-out:
-        if (ret)
-                GF_FREE (pattern_list);
-        GF_FREE (dup_str);
-
-        return ret;
-}
-
-int
-init (xlator_t *this)
-{
-        dht_conf_t                      *conf           = NULL;
-        char                            *temp_str       = NULL;
-        int                              ret            = -1;
-        int                              i              = 0;
-        gf_defrag_info_t                *defrag         = NULL;
-        int                              cmd            = 0;
-        char                            *node_uuid      = NULL;
-
-
-        GF_VALIDATE_OR_GOTO ("dht", this, err);
-
-        if (!this->children) {
-                gf_log (this->name, GF_LOG_CRITICAL,
-                        "Distribute needs more than one subvolume");
-                return -1;
-        }
-
-        if (!this->parents) {
-                gf_log (this->name, GF_LOG_WARNING,
-                        "dangling volume. check volfile");
-        }
-
-        conf = GF_CALLOC (1, sizeof (*conf), gf_dht_mt_dht_conf_t);
-        if (!conf) {
-                goto err;
-        }
-
-        ret = dict_get_int32 (this->options, "rebalance-cmd", &cmd);
-
-        if (cmd) {
-                defrag = GF_CALLOC (1, sizeof (gf_defrag_info_t),
-                                    gf_defrag_info_mt);
-
-                GF_VALIDATE_OR_GOTO (this->name, defrag, err);
-
-                LOCK_INIT (&defrag->lock);
-
-                defrag->is_exiting = 0;
-
-                conf->defrag = defrag;
-
-                ret = dict_get_str (this->options, "node-uuid", &node_uuid);
-                if (ret) {
-                        gf_log (this->name, GF_LOG_ERROR, "node-uuid not "
-                                "specified");
-                        goto err;
-                }
-
-                if (uuid_parse (node_uuid, defrag->node_uuid)) {
-                        gf_log (this->name, GF_LOG_ERROR, "Cannot parse "
-                                "glusterd node uuid");
-                        goto err;
-                }
-
-                defrag->cmd = cmd;
-
-                defrag->stats = _gf_false;
-        }
-
-        conf->search_unhashed = GF_DHT_LOOKUP_UNHASHED_ON;
-        if (dict_get_str (this->options, "lookup-unhashed", &temp_str) == 0) {
-                /* If option is not "auto", other options _should_ be boolean */
-                if (strcasecmp (temp_str, "auto"))
-                        gf_string2boolean (temp_str, &conf->search_unhashed);
-                else
-                        conf->search_unhashed = GF_DHT_LOOKUP_UNHASHED_AUTO;
-        }
-
-        GF_OPTION_INIT ("unhashed-sticky-bit", conf->unhashed_sticky_bit, bool,
-                        err);
-
-        GF_OPTION_INIT ("use-readdirp", conf->use_readdirp, bool, err);
-
-	GF_OPTION_INIT ("min-free-disk", conf->min_free_disk, percent_or_size,
-			err);
-
-        GF_OPTION_INIT ("min-free-inodes", conf->min_free_inodes, percent,
-                        err);
-
-        conf->dir_spread_cnt = conf->subvolume_cnt;
-        GF_OPTION_INIT ("directory-layout-spread", conf->dir_spread_cnt,
-                        uint32, err);
-
-        GF_OPTION_INIT ("assert-no-child-down", conf->assert_no_child_down,
-                        bool, err);
-
-        GF_OPTION_INIT ("readdir-optimize", conf->readdir_optimize, bool, err);
-
-        if (defrag) {
-                GF_OPTION_INIT ("rebalance-stats", defrag->stats, bool, err);
-                if (dict_get_str (this->options, "rebalance-filter", &temp_str)
-                    == 0) {
-                        if (gf_defrag_pattern_list_fill (this, defrag, temp_str)
-                            == -1) {
-                                gf_log (this->name, GF_LOG_ERROR, "Cannot parse"
-                                        " rebalance-filter (%s)", temp_str);
-                                goto err;
-                        }
-                }
-        }
-
-        /* option can be any one of percent or bytes */
-        conf->disk_unit = 0;
-        if (conf->min_free_disk < 100)
-                conf->disk_unit = 'p';
-
-        ret = dht_init_subvolumes (this, conf);
-        if (ret == -1) {
-                goto err;
-        }
-
-        if (dict_get_str (this->options, "decommissioned-bricks", &temp_str) == 0) {
-                ret = dht_parse_decommissioned_bricks (this, conf, temp_str);
-                if (ret == -1)
-                        goto err;
-        }
-
-        dht_init_regex (this, this->options, "rsync-hash-regex",
-                        &conf->rsync_regex, &conf->rsync_regex_valid);
-        dht_init_regex (this, this->options, "extra-hash-regex",
-                        &conf->extra_regex, &conf->extra_regex_valid);
-
-        ret = dht_layouts_init (this, conf);
-        if (ret == -1) {
-                goto err;
-        }
-
-        LOCK_INIT (&conf->subvolume_lock);
-        LOCK_INIT (&conf->layout_lock);
-
-        conf->gen = 1;
-
-        this->local_pool = mem_pool_new (dht_local_t, 512);
-        if (!this->local_pool) {
-                gf_log (this->name, GF_LOG_ERROR,
-                        "failed to create local_t's memory pool");
-                goto err;
-        }
-
-        this->private = conf;
-
-        return 0;
-
-err:
-        if (conf) {
-                if (conf->file_layouts) {
-                        for (i = 0; i < conf->subvolume_cnt; i++) {
-                                GF_FREE (conf->file_layouts[i]);
-                        }
-                        GF_FREE (conf->file_layouts);
-                }
-
-                GF_FREE (conf->subvolumes);
-
-                GF_FREE (conf->subvolume_status);
-
-                GF_FREE (conf->du_stats);
-
-                GF_FREE (conf->defrag);
-
-                GF_FREE (conf);
-        }
-
-        return -1;
-}
-
+class_methods_t class_methods = {
+        .init           = dht_init,
+        .fini           = dht_fini,
+        .reconfigure    = dht_reconfigure,
+        .notify         = dht_notify
+};
 
 struct xlator_fops fops = {
         .lookup      = dht_lookup,
@@ -676,6 +70,9 @@ struct xlator_fops fops = {
         .fxattrop    = dht_fxattrop,
         .setattr     = dht_setattr,
         .fsetattr    = dht_fsetattr,
+	.fallocate   = dht_fallocate,
+	.discard     = dht_discard,
+        .zerofill    = dht_zerofill,
 };
 
 struct xlator_dumpops dumpops = {
@@ -689,98 +86,4 @@ struct xlator_cbks cbks = {
 //      .releasedir = dht_releasedir,
         .forget     = dht_forget
 };
-
-
-struct volume_options options[] = {
-        { .key  = {"lookup-unhashed"},
-          .value = {"auto", "yes", "no", "enable", "disable", "1", "0",
-                    "on", "off"},
-          .type = GF_OPTION_TYPE_STR,
-          .default_value = "on",
-          .description = "This option if set to ON, does a lookup through "
-          "all the sub-volumes, in case a lookup didn't return any result "
-          "from the hash subvolume. If set to OFF, it does not do a lookup "
-          "on the remaining subvolumes."
-        },
-        { .key  = {"min-free-disk"},
-          .type = GF_OPTION_TYPE_PERCENT_OR_SIZET,
-          .default_value = "10%",
-          .description = "Percentage/Size of disk space, after which the "
-          "process starts balancing out the cluster, and logs will appear "
-          "in log files",
-        },
-	{ .key  = {"min-free-inodes"},
-          .type = GF_OPTION_TYPE_PERCENT,
-          .default_value = "5%",
-          .description = "after system has only N% of inodes, warnings "
-          "starts to appear in log files",
-        },
-        { .key = {"unhashed-sticky-bit"},
-          .type = GF_OPTION_TYPE_BOOL,
-          .default_value = "off",
-        },
-        { .key = {"use-readdirp"},
-          .type = GF_OPTION_TYPE_BOOL,
-          .default_value = "on",
-          .description = "This option if set to ON, forces the use of "
-          "readdirp, and hence also displays the stats of the files."
-        },
-        { .key = {"assert-no-child-down"},
-          .type = GF_OPTION_TYPE_BOOL,
-          .default_value = "off",
-          .description = "This option if set to ON, in the event of "
-          "CHILD_DOWN, will call exit."
-        },
-        { .key  = {"directory-layout-spread"},
-          .type = GF_OPTION_TYPE_INT,
-          .min  = 1,
-          .validate = GF_OPT_VALIDATE_MIN,
-          .description = "Specifies the directory layout spread."
-        },
-        { .key  = {"decommissioned-bricks"},
-          .type = GF_OPTION_TYPE_ANY,
-          .description = "This option if set to ON, decommissions "
-          "the brick, so that no new data is allowed to be created "
-          "on that brick."
-        },
-        { .key  = {"rebalance-cmd"},
-          .type = GF_OPTION_TYPE_INT,
-        },
-        { .key = {"node-uuid"},
-          .type = GF_OPTION_TYPE_STR,
-        },
-        { .key = {"rebalance-stats"},
-          .type = GF_OPTION_TYPE_BOOL,
-          .default_value = "off",
-          .description = "This option if set to ON displays and logs the "
-          " time taken for migration of each file, during the rebalance "
-          "process. If set to OFF, the rebalance logs will only display the "
-          "time spent in each directory."
-        },
-        { .key = {"readdir-optimize"},
-          .type = GF_OPTION_TYPE_BOOL,
-          .default_value = "off",
-          .description = "This option if set to ON enables the optimization "
-          "that allows DHT to requests non-first subvolumes to filter out "
-          "directory entries."
-        },
-        { .key = {"rsync-hash-regex"},
-          .type = GF_OPTION_TYPE_STR,
-          /* Setting a default here doesn't work.  See dht_init_regex. */
-          .description = "Regular expression for stripping temporary-file "
-          "suffix and prefix used by rsync, to prevent relocation when the "
-          "file is renamed."
-        },
-        { .key = {"extra-hash-regex"},
-          .type = GF_OPTION_TYPE_STR,
-          /* Setting a default here doesn't work.  See dht_init_regex. */
-          .description = "Regular expression for stripping temporary-file "
-          "suffix and prefix used by an application, to prevent relocation when "
-          "the file is renamed."
-        },
-        { .key = {"rebalance-filter"},
-          .type = GF_OPTION_TYPE_STR,
-        },
-
-        { .key  = {NULL} },
-};
+;
diff --git a/xlators/cluster/dht/src/nufa.c b/xlators/cluster/dht/src/nufa.c
index 52086e268..e934acdf0 100644
--- a/xlators/cluster/dht/src/nufa.c
+++ b/xlators/cluster/dht/src/nufa.c
@@ -18,6 +18,8 @@
 
 /* TODO: all 'TODO's in dht.c holds good */
 
+extern struct volume_options options[];
+
 int
 nufa_local_lookup_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                        int op_ret, int op_errno,
@@ -52,7 +54,8 @@ nufa_local_lookup_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
         if (op_ret == -1)
                 goto out;
 
-        is_linkfile = check_is_linkfile (inode, stbuf, xattr);
+        is_linkfile = check_is_linkfile (inode, stbuf, xattr,
+                                         conf->link_xattr_name);
         is_dir      = check_is_dir (inode, stbuf, xattr);
 
         if (!is_dir && !is_linkfile) {
@@ -201,7 +204,7 @@ nufa_lookup (call_frame_t *frame, xlator_t *this,
                  *       revalidates directly go to the cached-subvolume.
                  */
                 ret = dict_set_uint32 (local->xattr_req,
-                                       "trusted.glusterfs.dht", 4 * 4);
+                                       conf->xattr_name, 4 * 4);
                 if (ret < 0) {
                         gf_log (this->name, GF_LOG_ERROR,
                                 "Failed to set dict value.");
@@ -222,7 +225,7 @@ nufa_lookup (call_frame_t *frame, xlator_t *this,
         } else {
         do_fresh_lookup:
                 ret = dict_set_uint32 (local->xattr_req,
-                                       "trusted.glusterfs.dht", 4 * 4);
+                                       conf->xattr_name, 4 * 4);
                 if (ret < 0) {
                         gf_log (this->name, GF_LOG_ERROR,
                                 "Failed to set dict value.");
@@ -231,7 +234,7 @@ nufa_lookup (call_frame_t *frame, xlator_t *this,
                 }
 
                 ret = dict_set_uint32 (local->xattr_req,
-                                       "trusted.glusterfs.dht.linkto", 256);
+                                       conf->link_xattr_name, 256);
                 if (ret < 0) {
                         gf_log (this->name, GF_LOG_ERROR,
                                 "Failed to set dict value.");
@@ -320,7 +323,8 @@ nufa_create (call_frame_t *frame, xlator_t *this,
         if (dht_is_subvol_filled (this, (xlator_t *)conf->private)) {
                 avail_subvol =
                         dht_free_disk_available_subvol (this,
-                                                        (xlator_t *)conf->private);
+                                                        (xlator_t *)conf->private,
+                                                        local);
         }
 
         if (subvol != avail_subvol) {
@@ -330,9 +334,8 @@ nufa_create (call_frame_t *frame, xlator_t *this,
                 local->flags = flags;
                 local->umask = umask;
                 local->cached_subvol = avail_subvol;
-                dht_linkfile_create (frame,
-                                     nufa_create_linkfile_create_cbk,
-                                     avail_subvol, subvol, loc);
+                dht_linkfile_create (frame, nufa_create_linkfile_create_cbk,
+                                     this, avail_subvol, subvol, loc);
                 return 0;
         }
 
@@ -425,7 +428,8 @@ nufa_mknod (call_frame_t *frame, xlator_t *this,
         if (dht_is_subvol_filled (this, (xlator_t *)conf->private)) {
                 avail_subvol =
                         dht_free_disk_available_subvol (this,
-                                                        (xlator_t *)conf->private);
+                                                        (xlator_t *)conf->private,
+                                                        local);
         }
 
         if (avail_subvol != subvol) {
@@ -437,7 +441,7 @@ nufa_mknod (call_frame_t *frame, xlator_t *this,
                 local->rdev = rdev;
                 local->cached_subvol = avail_subvol;
 
-                dht_linkfile_create (frame, nufa_mknod_linkfile_cbk,
+                dht_linkfile_create (frame, nufa_mknod_linkfile_cbk, this,
                                      avail_subvol, subvol, loc);
                 return 0;
         }
@@ -460,42 +464,6 @@ err:
 }
 
 
-int
-notify (xlator_t *this, int event, void *data, ...)
-{
-        int ret = -1;
-
-        ret = dht_notify (this, event, data);
-
-        return ret;
-}
-
-void
-fini (xlator_t *this)
-{
-        int         i = 0;
-        dht_conf_t *conf = NULL;
-
-        conf = this->private;
-
-        if (conf) {
-                if (conf->file_layouts) {
-                        for (i = 0; i < conf->subvolume_cnt; i++) {
-                                GF_FREE (conf->file_layouts[i]);
-                        }
-                        GF_FREE (conf->file_layouts);
-                }
-
-                GF_FREE (conf->subvolumes);
-
-                GF_FREE (conf->subvolume_status);
-
-                GF_FREE (conf);
-        }
-
-        return;
-}
-
 gf_boolean_t
 same_first_part (char *str1, char term1, char *str2, char term2)
 {
@@ -516,201 +484,150 @@ same_first_part (char *str1, char term1, char *str2, char term2)
         }
 }
 
-int32_t
-mem_acct_init (xlator_t *this)
+typedef struct nufa_args {
+        xlator_t    *this;
+        char        *volname;
+        gf_boolean_t addr_match;
+} nufa_args_t;
+
+static void
+nufa_find_local_brick (xlator_t *xl, void *data)
 {
-        int     ret = -1;
+        nufa_args_t     *args = data;
+        xlator_t        *this = args->this;
+        char            *local_volname = args->volname;
+        gf_boolean_t    addr_match = args->addr_match;
+        char            *brick_host = NULL;
+        dht_conf_t      *conf = this->private;
+        int             ret = -1;
+
+        /*This means a local subvol was already found. We pick the first brick
+         * that is local*/
+        if (conf->private)
+                return;
+
+        if (strcmp (xl->name, local_volname) == 0) {
+                conf->private = xl;
+                gf_log (this->name, GF_LOG_INFO, "Using specified subvol %s",
+                        local_volname);
+                return;
+        }
+
+        if (!addr_match)
+                return;
+
+        ret = dict_get_str (xl->options, "remote-host", &brick_host);
+        if ((ret == 0) &&
+            (gf_is_same_address (local_volname, brick_host) ||
+             gf_is_local_addr (brick_host))) {
+                conf->private = xl;
+                gf_log (this->name, GF_LOG_INFO, "Using the first local "
+                        "subvol %s", xl->name);
+                return;
+        }
 
-        ret = xlator_mem_acct_init (this, gf_dht_mt_end + 1);
-        return ret;
 }
 
-int
-init (xlator_t *this)
+static void
+nufa_to_dht (xlator_t *this)
 {
-        dht_conf_t    *conf = NULL;
-        xlator_list_t *trav = NULL;
-        data_t        *data = NULL;
-        char          *local_volname = NULL;
-        char          *temp_str = NULL;
-        int            ret = -1;
-        int            i = 0;
-        char           my_hostname[256];
-        double         temp_free_disk = 0;
-        uint64_t       size = 0;
-        xlator_t      *local_subvol = NULL;
-        char          *brick_host = NULL;
-        xlator_t      *kid = NULL;
-
-        if (!this->children) {
-                gf_log (this->name, GF_LOG_CRITICAL,
-                        "NUFA needs more than one subvolume");
-                return -1;
-        }
+        GF_ASSERT (this);
+        GF_ASSERT (this->fops);
 
-        if (!this->parents) {
-                gf_log (this->name, GF_LOG_WARNING,
-                        "dangling volume. check volfile");
-        }
+        this->fops->lookup = dht_lookup;
+        this->fops->create = dht_create;
+        this->fops->mknod  = dht_mknod;
+}
 
-        conf = GF_CALLOC (1, sizeof (*conf),
-                          gf_dht_mt_dht_conf_t);
-        if (!conf) {
-                goto err;
+int
+nufa_find_local_subvol (xlator_t *this,
+                        void (*fn) (xlator_t *each, void* data), void *data)
+{
+        int             ret = -1;
+        dht_conf_t      *conf = this->private;
+        xlator_list_t   *trav = NULL;
+        xlator_t        *parent = NULL;
+        xlator_t        *candidate = NULL;
+
+        xlator_foreach_depth_first (this, fn, data);
+        if (!conf->private) {
+                gf_log (this->name, GF_LOG_ERROR, "Couldn't find a local "
+                        "brick");
+                return -1;
         }
 
-        conf->search_unhashed = GF_DHT_LOOKUP_UNHASHED_ON;
-        if (dict_get_str (this->options, "lookup-unhashed", &temp_str) == 0) {
-                /* If option is not "auto", other options _should_ be boolean */
-                if (strcasecmp (temp_str, "auto"))
-                        gf_string2boolean (temp_str, &conf->search_unhashed);
-                else
-                        conf->search_unhashed = GF_DHT_LOOKUP_UNHASHED_AUTO;
-        }
+        candidate = conf->private;
+        trav = candidate->parents;
+        while (trav) {
 
-        ret = dht_init_subvolumes (this, conf);
-        if (ret == -1) {
-                goto err;
-        }
+                parent = trav->xlator;
+                if (strcmp (parent->type, "cluster/nufa") == 0) {
+                        gf_log (this->name, GF_LOG_INFO, "Found local subvol, "
+                                "%s", candidate->name);
+                        ret = 0;
+                        conf->private = candidate;
+                        break;
+                }
 
-        ret = dht_layouts_init (this, conf);
-        if (ret == -1) {
-                goto err;
+                candidate = parent;
+                trav = parent->parents;
         }
 
-        LOCK_INIT (&conf->subvolume_lock);
-        LOCK_INIT (&conf->layout_lock);
+        return ret;
+}
 
-        conf->gen = 1;
+int
+nufa_init (xlator_t *this)
+{
+        data_t        *data = NULL;
+        char          *local_volname = NULL;
+        int            ret = -1;
+        char           my_hostname[256];
+        gf_boolean_t   addr_match = _gf_false;
+        nufa_args_t    args = {0, };
 
-        local_volname = "localhost";
-        ret = gethostname (my_hostname, 256);
-        if (ret < 0) {
-                gf_log (this->name, GF_LOG_WARNING,
-                        "could not find hostname (%s)",
-                        strerror (errno));
+        ret = dht_init(this);
+        if (ret) {
+                return ret;
         }
 
-        if (ret == 0)
-                local_volname = my_hostname;
-
-        data = dict_get (this->options, "local-volume-name");
-        if (data) {
+        if ((data = dict_get (this->options, "local-volume-name"))) {
                 local_volname = data->data;
-        }
 
-        for (trav = this->children; trav; trav = trav->next) {
-                if (strcmp (trav->xlator->name, local_volname) == 0)
-                        break;
-                if (local_subvol) {
-                        continue;
-                }
-                kid = trav->xlator;
-                for (;;) {
-                        if (dict_get_str(trav->xlator->options,"remote-host",
-                                         &brick_host) == 0) {
-                                /* Found it. */
-                                break;
-                        }
-                        if (!kid->children) {
-                                /* Nowhere further to look. */
-                                gf_log (this->name, GF_LOG_ERROR,
-                                        "could not get remote-host");
-                                goto err;
-                        }
-                        if (kid->children->next) {
-                                /* Multiple choices, can't/shouldn't decide. */
-                                gf_log (this->name, GF_LOG_ERROR,
-                                        "NUFA found fan-out (type %s) volume",
-                                        kid->type);
-                                goto err;
-                        }
-                        /* One-to-one xlators are OK, try the next one. */
-                        kid = kid->children->xlator;
-                }
-                if (same_first_part(my_hostname,'.',brick_host,'.')) {
-                        local_subvol = trav->xlator;
-                }
-        }
-
-        if (trav) {
-                gf_log (this->name, GF_LOG_INFO,
-                        "Using specified subvol %s", local_volname);
-                conf->private = trav->xlator;
-        }
-        else if (local_subvol) {
-                gf_log (this->name, GF_LOG_INFO,
-                        "Using first local subvol %s", local_subvol->name);
-                conf->private = local_subvol;
-        }
-        else {
-                gf_log (this->name, GF_LOG_ERROR,
-                        "Could not find specified or local subvol");
-                goto err;
-
-        }
+        } else {
+                addr_match = _gf_true;
+                local_volname = "localhost";
+                ret = gethostname (my_hostname, 256);
+                if (ret == 0)
+                        local_volname = my_hostname;
 
-        /* The volume specified exists */
-
-        conf->min_free_disk = 10;
-        conf->disk_unit = 'p';
-
-        if (dict_get_str (this->options, "min-free-disk",
-                          &temp_str) == 0) {
-                if (gf_string2percent (temp_str,
-                                       &temp_free_disk) == 0) {
-                        if (temp_free_disk > 100) {
-                                gf_string2bytesize (temp_str, &size);
-                                conf->min_free_disk = size;
-                                conf->disk_unit = 'b';
-                        } else {
-                                conf->min_free_disk = temp_free_disk;
-                                conf->disk_unit = 'p';
-                        }
-                } else {
-                        gf_string2bytesize (temp_str, &size);
-                        conf->min_free_disk = size;
-                        conf->disk_unit = 'b';
-                }
-        }
+                else
+                        gf_log (this->name, GF_LOG_WARNING,
+                                "could not find hostname (%s)",
+                                strerror (errno));
 
-        conf->du_stats = GF_CALLOC (conf->subvolume_cnt, sizeof (dht_du_t),
-                                    gf_dht_mt_dht_du_t);
-        if (!conf->du_stats) {
-                goto err;
         }
 
-        this->local_pool = mem_pool_new (dht_local_t, 128);
-        if (!this->local_pool) {
-                gf_log (this->name, GF_LOG_ERROR,
-                        "failed to create local_t's memory pool");
-                goto err;
+        args.this = this;
+        args.volname = local_volname;
+        args.addr_match = addr_match;
+        ret = nufa_find_local_subvol (this, nufa_find_local_brick, &args);
+        if (ret) {
+                gf_log (this->name, GF_LOG_INFO,
+                        "Unable to find local subvolume, switching "
+                        "to dht mode");
+                nufa_to_dht (this);
         }
-
-        this->private = conf;
-
         return 0;
+}
 
-err:
-        if (conf) {
-                if (conf->file_layouts) {
-                        for (i = 0; i < conf->subvolume_cnt; i++) {
-                                GF_FREE (conf->file_layouts[i]);
-                        }
-                        GF_FREE (conf->file_layouts);
-                }
-
-                GF_FREE (conf->subvolumes);
-
-                GF_FREE (conf->subvolume_status);
-
-                GF_FREE (conf->du_stats);
-
-                GF_FREE (conf);
-        }
 
-        return -1;
-}
+class_methods_t class_methods = {
+        .init           = nufa_init,
+        .fini           = dht_fini,
+        .reconfigure    = dht_reconfigure,
+        .notify         = dht_notify
+};
 
 
 struct xlator_fops fops = {
@@ -757,19 +674,3 @@ struct xlator_fops fops = {
 struct xlator_cbks cbks = {
         .forget     = dht_forget
 };
-
-
-struct volume_options options[] = {
-        { .key  = {"lookup-unhashed"},
-          .value = {"auto", "yes", "no", "enable", "disable", "1", "0",
-                    "on", "off"},
-          .type = GF_OPTION_TYPE_STR
-        },
-        { .key  = {"local-volume-name"},
-          .type = GF_OPTION_TYPE_XLATOR
-        },
-        { .key  = {"min-free-disk"},
-          .type = GF_OPTION_TYPE_PERCENT_OR_SIZET,
-        },
-        { .key  = {NULL} },
-};
diff --git a/xlators/cluster/dht/src/switch.c b/xlators/cluster/dht/src/switch.c
index 6ec343102..d3ea90ba8 100644
--- a/xlators/cluster/dht/src/switch.c
+++ b/xlators/cluster/dht/src/switch.c
@@ -22,6 +22,8 @@
 #include <fnmatch.h>
 #include <string.h>
 
+extern struct volume_options options[];
+
 struct switch_sched_array {
         xlator_t *xl;
         int32_t   eligible;
@@ -135,7 +137,8 @@ switch_local_lookup_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
         if (op_ret == -1)
                 goto out;
 
-        is_linkfile = check_is_linkfile (inode, stbuf, xattr);
+        is_linkfile = check_is_linkfile (inode, stbuf, xattr,
+                                         conf->link_xattr_name);
         is_dir      = check_is_dir (inode, stbuf, xattr);
 
         if (!is_dir && !is_linkfile) {
@@ -289,11 +292,11 @@ switch_lookup (call_frame_t *frame, xlator_t *this,
                  * attribute, revalidates directly go to the cached-subvolume.
                  */
                 ret = dict_set_uint32 (local->xattr_req,
-                                       "trusted.glusterfs.dht", 4 * 4);
+                                       conf->xattr_name, 4 * 4);
                 if (ret < 0)
                         gf_log (this->name, GF_LOG_WARNING,
-                                "failed to set dict value for "
-                                "trusted.glusterfs.dht");
+                                "failed to set dict value for %s",
+                                conf->xattr_name);
 
                 for (i = 0; i < layout->cnt; i++) {
                         subvol = layout->list[i].xlator;
@@ -308,18 +311,18 @@ switch_lookup (call_frame_t *frame, xlator_t *this,
         } else {
         do_fresh_lookup:
                 ret = dict_set_uint32 (local->xattr_req,
-                                       "trusted.glusterfs.dht", 4 * 4);
+                                       conf->xattr_name, 4 * 4);
                 if (ret < 0)
                         gf_log (this->name, GF_LOG_WARNING,
-                                "failed to set dict value for "
-                                "trusted.glusterfs.dht");
+                                "failed to set dict value for %s",
+                                conf->xattr_name);
 
                 ret = dict_set_uint32 (local->xattr_req,
-                                       "trusted.glusterfs.dht.linkto", 256);
+                                       conf->link_xattr_name, 256);
                 if (ret < 0)
                         gf_log (this->name, GF_LOG_WARNING,
-                                "failed to set dict value for "
-                                "trusted.glusterfs.dht.linkto");
+                                "failed to set dict value for %s",
+                                conf->link_xattr_name);
 
                 if (!hashed_subvol) {
                         gf_log (this->name, GF_LOG_DEBUG,
@@ -434,7 +437,8 @@ switch_create (call_frame_t *frame, xlator_t *this,
         avail_subvol = get_switch_matching_subvol (loc->path, conf, subvol);
         if (dht_is_subvol_filled (this, avail_subvol)) {
                 avail_subvol =
-                        dht_free_disk_available_subvol (this, avail_subvol);
+                        dht_free_disk_available_subvol (this, avail_subvol,
+                                                        local);
         }
 
         if (subvol != avail_subvol) {
@@ -443,9 +447,8 @@ switch_create (call_frame_t *frame, xlator_t *this,
                 local->flags = flags;
                 local->umask = umask;
                 local->cached_subvol = avail_subvol;
-                dht_linkfile_create (frame,
-                                     switch_create_linkfile_create_cbk,
-                                     avail_subvol, subvol, loc);
+                dht_linkfile_create (frame, switch_create_linkfile_create_cbk,
+                                     this, avail_subvol, subvol, loc);
                 return 0;
         }
 
@@ -534,7 +537,8 @@ switch_mknod (call_frame_t *frame, xlator_t *this, loc_t *loc, mode_t mode,
         avail_subvol = get_switch_matching_subvol (loc->path, conf, subvol);
         if (dht_is_subvol_filled (this, avail_subvol)) {
                 avail_subvol =
-                        dht_free_disk_available_subvol (this, avail_subvol);
+                        dht_free_disk_available_subvol (this, avail_subvol,
+                                                        local);
         }
 
         if (avail_subvol != subvol) {
@@ -547,7 +551,7 @@ switch_mknod (call_frame_t *frame, xlator_t *this, loc_t *loc, mode_t mode,
                 local->cached_subvol = avail_subvol;
 
                 dht_linkfile_create (frame, switch_mknod_linkfile_cbk,
-                                     avail_subvol, subvol, loc);
+                                     this, avail_subvol, subvol, loc);
                 return 0;
         }
 
@@ -569,20 +573,9 @@ err:
 }
 
 
-int
-notify (xlator_t *this, int event, void *data, ...)
-{
-        int ret = -1;
-
-        ret = dht_notify (this, event, data);
-
-        return ret;
-}
-
 void
-fini (xlator_t *this)
+switch_fini (xlator_t *this)
 {
-        int                   i = 0;
         dht_conf_t           *conf = NULL;
         struct switch_struct *trav = NULL;
         struct switch_struct *prev = NULL;
@@ -598,22 +591,9 @@ fini (xlator_t *this)
                         trav = trav->next;
                         GF_FREE (prev);
                 }
-
-                if (conf->file_layouts) {
-                        for (i = 0; i < conf->subvolume_cnt; i++) {
-                                GF_FREE (conf->file_layouts[i]);
-                        }
-                        GF_FREE (conf->file_layouts);
-                }
-
-                GF_FREE (conf->subvolumes);
-
-                GF_FREE (conf->subvolume_status);
-
-                GF_FREE (conf);
         }
 
-        return;
+        dht_fini(this);
 }
 
 int
@@ -839,68 +819,18 @@ err:
 }
 
 
-int
-init (xlator_t *this)
+int32_t
+switch_init (xlator_t *this)
 {
         dht_conf_t            *conf = NULL;
         data_t                *data = NULL;
-        char                  *temp_str = NULL;
         int                    ret = -1;
-        int                    i = 0;
-        double                 temp_free_disk = 0;
-        uint64_t               size = 0;
-
-        if (!this->children) {
-                gf_log (this->name, GF_LOG_CRITICAL,
-                        "SWITCH needs more than one subvolume");
-                return -1;
-        }
-
-        if (!this->parents) {
-                gf_log (this->name, GF_LOG_WARNING,
-                        "dangling volume. check volfile");
-        }
-
-        conf = GF_CALLOC (1, sizeof (*conf), gf_switch_mt_dht_conf_t);
-        if (!conf) {
-                goto err;
-        }
-
-        conf->search_unhashed = GF_DHT_LOOKUP_UNHASHED_ON;
-        if (dict_get_str (this->options, "lookup-unhashed", &temp_str) == 0) {
-                /* If option is not "auto", other options _should_ be boolean */
-                if (strcasecmp (temp_str, "auto"))
-                        gf_string2boolean (temp_str, &conf->search_unhashed);
-                else
-                        conf->search_unhashed = GF_DHT_LOOKUP_UNHASHED_AUTO;
-        }
 
-        conf->unhashed_sticky_bit = 0;
-        if (dict_get_str (this->options, "unhashed-sticky-bit",
-                          &temp_str) == 0) {
-                gf_string2boolean (temp_str, &conf->unhashed_sticky_bit);
-        }
-
-        conf->min_free_disk = 10.0;
-        conf->disk_unit = 'p';
-
-        if (dict_get_str (this->options, "min-free-disk",
-                          &temp_str) == 0) {
-                if (gf_string2percent (temp_str, &temp_free_disk) == 0) {
-                        if (temp_free_disk > 100) {
-                                gf_string2bytesize (temp_str, &size);
-                                conf->min_free_disk = size;
-                                conf->disk_unit = 'b';
-                        } else {
-                                conf->min_free_disk = temp_free_disk;
-                                conf->disk_unit = 'p';
-                        }
-                } else {
-                        gf_string2bytesize (temp_str, &size);
-                        conf->min_free_disk = size;
-                        conf->disk_unit = 'b';
-                }
+        ret = dht_init(this);
+        if (ret) {
+                return ret;
         }
+        conf = this->private;
 
         data = dict_get (this->options, "pattern.switch.case");
         if (data) {
@@ -911,60 +841,23 @@ init (xlator_t *this)
                 }
         }
 
-        ret = dht_init_subvolumes (this, conf);
-        if (ret == -1) {
-                goto err;
-        }
-
-        ret = dht_layouts_init (this, conf);
-        if (ret == -1) {
-                goto err;
-        }
-
-        LOCK_INIT (&conf->subvolume_lock);
-        LOCK_INIT (&conf->layout_lock);
-
-        conf->gen = 1;
-
-        conf->du_stats = GF_CALLOC (conf->subvolume_cnt, sizeof (dht_du_t),
-                                    gf_switch_mt_dht_du_t);
-        if (!conf->du_stats) {
-                goto err;
-        }
-
-        this->local_pool = mem_pool_new (dht_local_t, 128);
-        if (!this->local_pool) {
-                gf_log (this->name, GF_LOG_ERROR,
-                        "failed to create local_t's memory pool");
-                goto err;
-        }
-
         this->private = conf;
-
         return 0;
 
 err:
-        if (conf) {
-                if (conf->file_layouts) {
-                        for (i = 0; i < conf->subvolume_cnt; i++) {
-                                GF_FREE (conf->file_layouts[i]);
-                        }
-                        GF_FREE (conf->file_layouts);
-                }
-
-                GF_FREE (conf->subvolumes);
-
-                GF_FREE (conf->subvolume_status);
-
-                GF_FREE (conf->du_stats);
-
-                GF_FREE (conf);
-        }
-
+        dht_fini(this);
         return -1;
 }
 
 
+class_methods_t class_methods = {
+        .init           = switch_init,
+        .fini           = switch_fini,
+        .reconfigure    = dht_reconfigure,
+        .notify         = dht_notify
+};
+
+
 struct xlator_fops fops = {
         .lookup      = switch_lookup,
         .create      = switch_create,
@@ -1009,19 +902,3 @@ struct xlator_fops fops = {
 struct xlator_cbks cbks = {
         .forget     = dht_forget
 };
-
-
-struct volume_options options[] = {
-        { .key  = {"lookup-unhashed"},
-          .value = {"auto", "yes", "no", "enable", "disable", "1", "0",
-                    "on", "off"},
-          .type = GF_OPTION_TYPE_STR
-        },
-        { .key  = {"pattern.switch.case"},
-          .type = GF_OPTION_TYPE_ANY
-        },
-        { .key  = {"min-free-disk"},
-          .type = GF_OPTION_TYPE_PERCENT_OR_SIZET,
-        },
-        { .key  = {NULL} },
-};
diff --git a/xlators/cluster/stripe/src/stripe.c b/xlators/cluster/stripe/src/stripe.c
index dadd3fec5..69b510e23 100644
--- a/xlators/cluster/stripe/src/stripe.c
+++ b/xlators/cluster/stripe/src/stripe.c
@@ -3774,6 +3774,524 @@ err:
 
 
 int32_t
+stripe_fallocate_cbk(call_frame_t *frame, void *cookie, xlator_t *this,
+                     int32_t op_ret, int32_t op_errno, struct iatt *prebuf,
+                     struct iatt *postbuf, dict_t *xdata)
+{
+        int32_t         callcnt = 0;
+        stripe_local_t *local = NULL;
+	stripe_local_t *mlocal = NULL;
+        call_frame_t   *prev = NULL;
+	call_frame_t   *mframe = NULL;
+
+        if (!this || !frame || !frame->local || !cookie) {
+                gf_log ("stripe", GF_LOG_DEBUG, "possible NULL deref");
+                goto out;
+        }
+
+        prev  = cookie;
+        local = frame->local;
+	mframe = local->orig_frame;
+	mlocal = mframe->local;
+
+        LOCK(&frame->lock);
+        {
+                callcnt = ++mlocal->call_count;
+
+                if (op_ret == 0) {
+                        mlocal->post_buf = *postbuf;
+                        mlocal->pre_buf = *prebuf;
+
+			mlocal->prebuf_blocks  += prebuf->ia_blocks;
+			mlocal->postbuf_blocks += postbuf->ia_blocks;
+
+			correct_file_size(prebuf, mlocal->fctx, prev);
+			correct_file_size(postbuf, mlocal->fctx, prev);
+
+			if (mlocal->prebuf_size < prebuf->ia_size)
+				mlocal->prebuf_size = prebuf->ia_size;
+			if (mlocal->postbuf_size < postbuf->ia_size)
+				mlocal->postbuf_size = postbuf->ia_size;
+                }
+
+		/* return the first failure */
+		if (mlocal->op_ret == 0) {
+			mlocal->op_ret = op_ret;
+			mlocal->op_errno = op_errno;
+		}
+        }
+        UNLOCK (&frame->lock);
+
+        if ((callcnt == mlocal->wind_count) && mlocal->unwind) {
+		mlocal->pre_buf.ia_size = mlocal->prebuf_size;
+		mlocal->pre_buf.ia_blocks = mlocal->prebuf_blocks;
+		mlocal->post_buf.ia_size = mlocal->postbuf_size;
+		mlocal->post_buf.ia_blocks = mlocal->postbuf_blocks;
+
+                STRIPE_STACK_UNWIND (fallocate, mframe, mlocal->op_ret,
+                                     mlocal->op_errno, &mlocal->pre_buf,
+                                     &mlocal->post_buf, NULL);
+        }
+out:
+	STRIPE_STACK_DESTROY(frame);
+        return 0;
+}
+
+int32_t
+stripe_fallocate(call_frame_t *frame, xlator_t *this, fd_t *fd, int32_t mode,
+		 off_t offset, size_t len, dict_t *xdata)
+{
+        stripe_local_t   *local = NULL;
+        stripe_fd_ctx_t  *fctx = NULL;
+        int32_t           op_errno = 1;
+        int32_t           idx = 0;
+        int32_t           offset_offset = 0;
+        int32_t           remaining_size = 0;
+        off_t             fill_size = 0;
+        uint64_t          stripe_size = 0;
+        uint64_t          tmp_fctx = 0;
+	off_t		  dest_offset = 0;
+	call_frame_t	  *fframe = NULL;
+	stripe_local_t	  *flocal = NULL;
+
+        VALIDATE_OR_GOTO (frame, err);
+        VALIDATE_OR_GOTO (this, err);
+        VALIDATE_OR_GOTO (fd, err);
+        VALIDATE_OR_GOTO (fd->inode, err);
+
+        inode_ctx_get (fd->inode, this, &tmp_fctx);
+        if (!tmp_fctx) {
+                op_errno = EINVAL;
+                goto err;
+        }
+        fctx = (stripe_fd_ctx_t *)(long)tmp_fctx;
+        stripe_size = fctx->stripe_size;
+
+        STRIPE_VALIDATE_FCTX (fctx, err);
+
+        remaining_size = len;
+
+        local = mem_get0 (this->local_pool);
+        if (!local) {
+                op_errno = ENOMEM;
+                goto err;
+        }
+        frame->local = local;
+        local->stripe_size = stripe_size;
+	local->fctx = fctx;
+
+        if (!stripe_size) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "Wrong stripe size for the file");
+                op_errno = EINVAL;
+                goto err;
+        }
+
+        while (1) {
+		fframe = copy_frame(frame);
+		flocal = mem_get0(this->local_pool);
+		if (!flocal) {
+			op_errno = ENOMEM;
+			goto err;
+		}
+		flocal->orig_frame = frame;
+		fframe->local = flocal;
+
+		/* send fallocate request to the associated child node */
+                idx = (((offset + offset_offset) /
+                        local->stripe_size) % fctx->stripe_count);
+
+                fill_size = (local->stripe_size -
+                             ((offset + offset_offset) % local->stripe_size));
+                if (fill_size > remaining_size)
+                        fill_size = remaining_size;
+
+                remaining_size -= fill_size;
+
+                local->wind_count++;
+                if (remaining_size == 0)
+                        local->unwind = 1;
+
+		dest_offset = offset + offset_offset;
+		if (fctx->stripe_coalesce)
+			dest_offset = coalesced_offset(dest_offset,
+					local->stripe_size, fctx->stripe_count);
+
+		/*
+		 * TODO: Create a separate handler for coalesce mode that sends a
+		 * single fallocate per-child (since the ranges are linear).
+		 */
+		STACK_WIND(fframe, stripe_fallocate_cbk, fctx->xl_array[idx],
+			   fctx->xl_array[idx]->fops->fallocate, fd, mode,
+			   dest_offset, fill_size, xdata);
+
+                offset_offset += fill_size;
+                if (remaining_size == 0)
+                        break;
+        }
+
+        return 0;
+err:
+	if (fframe)
+		STRIPE_STACK_DESTROY(fframe);
+
+        STRIPE_STACK_UNWIND (fallocate, frame, -1, op_errno, NULL, NULL, NULL);
+        return 0;
+}
+
+
+int32_t
+stripe_discard_cbk(call_frame_t *frame, void *cookie, xlator_t *this,
+                   int32_t op_ret, int32_t op_errno, struct iatt *prebuf,
+                   struct iatt *postbuf, dict_t *xdata)
+{
+        int32_t         callcnt = 0;
+        stripe_local_t *local = NULL;
+	stripe_local_t *mlocal = NULL;
+        call_frame_t   *prev = NULL;
+	call_frame_t   *mframe = NULL;
+
+        if (!this || !frame || !frame->local || !cookie) {
+                gf_log ("stripe", GF_LOG_DEBUG, "possible NULL deref");
+                goto out;
+        }
+
+        prev  = cookie;
+        local = frame->local;
+	mframe = local->orig_frame;
+	mlocal = mframe->local;
+
+        LOCK(&frame->lock);
+        {
+                callcnt = ++mlocal->call_count;
+
+                if (op_ret == 0) {
+                        mlocal->post_buf = *postbuf;
+                        mlocal->pre_buf = *prebuf;
+
+			mlocal->prebuf_blocks  += prebuf->ia_blocks;
+			mlocal->postbuf_blocks += postbuf->ia_blocks;
+
+			correct_file_size(prebuf, mlocal->fctx, prev);
+			correct_file_size(postbuf, mlocal->fctx, prev);
+
+			if (mlocal->prebuf_size < prebuf->ia_size)
+				mlocal->prebuf_size = prebuf->ia_size;
+			if (mlocal->postbuf_size < postbuf->ia_size)
+				mlocal->postbuf_size = postbuf->ia_size;
+                }
+
+		/* return the first failure */
+		if (mlocal->op_ret == 0) {
+			mlocal->op_ret = op_ret;
+			mlocal->op_errno = op_errno;
+		}
+        }
+        UNLOCK (&frame->lock);
+
+        if ((callcnt == mlocal->wind_count) && mlocal->unwind) {
+		mlocal->pre_buf.ia_size = mlocal->prebuf_size;
+		mlocal->pre_buf.ia_blocks = mlocal->prebuf_blocks;
+		mlocal->post_buf.ia_size = mlocal->postbuf_size;
+		mlocal->post_buf.ia_blocks = mlocal->postbuf_blocks;
+
+                STRIPE_STACK_UNWIND (discard, mframe, mlocal->op_ret,
+                                     mlocal->op_errno, &mlocal->pre_buf,
+                                     &mlocal->post_buf, NULL);
+        }
+out:
+	STRIPE_STACK_DESTROY(frame);
+        return 0;
+}
+
+int32_t
+stripe_discard(call_frame_t *frame, xlator_t *this, fd_t *fd, off_t offset,
+	       size_t len, dict_t *xdata)
+{
+        stripe_local_t   *local = NULL;
+        stripe_fd_ctx_t  *fctx = NULL;
+        int32_t           op_errno = 1;
+        int32_t           idx = 0;
+        int32_t           offset_offset = 0;
+        int32_t           remaining_size = 0;
+        off_t             fill_size = 0;
+        uint64_t          stripe_size = 0;
+        uint64_t          tmp_fctx = 0;
+	off_t		  dest_offset = 0;
+	call_frame_t	  *fframe = NULL;
+	stripe_local_t	  *flocal = NULL;
+
+        VALIDATE_OR_GOTO (frame, err);
+        VALIDATE_OR_GOTO (this, err);
+        VALIDATE_OR_GOTO (fd, err);
+        VALIDATE_OR_GOTO (fd->inode, err);
+
+        inode_ctx_get (fd->inode, this, &tmp_fctx);
+        if (!tmp_fctx) {
+                op_errno = EINVAL;
+                goto err;
+        }
+        fctx = (stripe_fd_ctx_t *)(long)tmp_fctx;
+        stripe_size = fctx->stripe_size;
+
+        STRIPE_VALIDATE_FCTX (fctx, err);
+
+        remaining_size = len;
+
+        local = mem_get0 (this->local_pool);
+        if (!local) {
+                op_errno = ENOMEM;
+                goto err;
+        }
+        frame->local = local;
+        local->stripe_size = stripe_size;
+	local->fctx = fctx;
+
+        if (!stripe_size) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "Wrong stripe size for the file");
+                op_errno = EINVAL;
+                goto err;
+        }
+
+        while (1) {
+		fframe = copy_frame(frame);
+		flocal = mem_get0(this->local_pool);
+		if (!flocal) {
+			op_errno = ENOMEM;
+			goto err;
+		}
+		flocal->orig_frame = frame;
+		fframe->local = flocal;
+
+		/* send discard request to the associated child node */
+                idx = (((offset + offset_offset) /
+                        local->stripe_size) % fctx->stripe_count);
+
+                fill_size = (local->stripe_size -
+                             ((offset + offset_offset) % local->stripe_size));
+                if (fill_size > remaining_size)
+                        fill_size = remaining_size;
+
+                remaining_size -= fill_size;
+
+                local->wind_count++;
+                if (remaining_size == 0)
+                        local->unwind = 1;
+
+		dest_offset = offset + offset_offset;
+		if (fctx->stripe_coalesce)
+			dest_offset = coalesced_offset(dest_offset,
+					local->stripe_size, fctx->stripe_count);
+
+		/*
+		 * TODO: Create a separate handler for coalesce mode that sends a
+		 * single discard per-child (since the ranges are linear).
+		 */
+		STACK_WIND(fframe, stripe_discard_cbk, fctx->xl_array[idx],
+			   fctx->xl_array[idx]->fops->discard, fd, dest_offset,
+			   fill_size, xdata);
+
+                offset_offset += fill_size;
+                if (remaining_size == 0)
+                        break;
+        }
+
+        return 0;
+err:
+	if (fframe)
+		STRIPE_STACK_DESTROY(fframe);
+
+        STRIPE_STACK_UNWIND (discard, frame, -1, op_errno, NULL, NULL, NULL);
+        return 0;
+}
+
+int32_t
+stripe_zerofill_cbk(call_frame_t *frame, void *cookie, xlator_t *this,
+                   int32_t op_ret, int32_t op_errno, struct iatt *prebuf,
+                   struct iatt *postbuf, dict_t *xdata)
+{
+        int32_t         callcnt    = 0;
+        stripe_local_t *local      = NULL;
+        stripe_local_t *mlocal     = NULL;
+        call_frame_t   *prev       = NULL;
+        call_frame_t   *mframe     = NULL;
+
+        if (!this || !frame || !frame->local || !cookie) {
+                gf_log ("stripe", GF_LOG_DEBUG, "possible NULL deref");
+                goto out;
+        }
+
+        prev  = cookie;
+        local = frame->local;
+        mframe = local->orig_frame;
+        mlocal = mframe->local;
+
+        LOCK(&frame->lock);
+        {
+                callcnt = ++mlocal->call_count;
+
+                if (op_ret == 0) {
+                        mlocal->post_buf = *postbuf;
+                        mlocal->pre_buf = *prebuf;
+
+                        mlocal->prebuf_blocks  += prebuf->ia_blocks;
+                        mlocal->postbuf_blocks += postbuf->ia_blocks;
+
+                        correct_file_size(prebuf, mlocal->fctx, prev);
+                        correct_file_size(postbuf, mlocal->fctx, prev);
+
+                        if (mlocal->prebuf_size < prebuf->ia_size)
+                                mlocal->prebuf_size = prebuf->ia_size;
+                        if (mlocal->postbuf_size < postbuf->ia_size)
+                                mlocal->postbuf_size = postbuf->ia_size;
+                }
+
+                /* return the first failure */
+                if (mlocal->op_ret == 0) {
+                        mlocal->op_ret = op_ret;
+                        mlocal->op_errno = op_errno;
+                }
+        }
+        UNLOCK (&frame->lock);
+
+        if ((callcnt == mlocal->wind_count) && mlocal->unwind) {
+                mlocal->pre_buf.ia_size = mlocal->prebuf_size;
+                mlocal->pre_buf.ia_blocks = mlocal->prebuf_blocks;
+                mlocal->post_buf.ia_size = mlocal->postbuf_size;
+                mlocal->post_buf.ia_blocks = mlocal->postbuf_blocks;
+
+                STRIPE_STACK_UNWIND (zerofill, mframe, mlocal->op_ret,
+                                     mlocal->op_errno, &mlocal->pre_buf,
+                                     &mlocal->post_buf, NULL);
+        }
+out:
+        STRIPE_STACK_DESTROY(frame);
+        return 0;
+}
+
+int32_t
+stripe_zerofill(call_frame_t *frame, xlator_t *this, fd_t *fd, off_t offset,
+               size_t len, dict_t *xdata)
+{
+        stripe_local_t   *local            = NULL;
+        stripe_fd_ctx_t  *fctx             = NULL;
+        int32_t           op_errno         = 1;
+        int32_t           idx              = 0;
+        int32_t           offset_offset    = 0;
+        int32_t           remaining_size   = 0;
+        off_t             fill_size        = 0;
+        uint64_t          stripe_size      = 0;
+        uint64_t          tmp_fctx         = 0;
+        off_t             dest_offset      = 0;
+        call_frame_t     *fframe           = NULL;
+        stripe_local_t   *flocal           = NULL;
+
+        VALIDATE_OR_GOTO (frame, err);
+        VALIDATE_OR_GOTO (this, err);
+        VALIDATE_OR_GOTO (fd, err);
+        VALIDATE_OR_GOTO (fd->inode, err);
+
+        inode_ctx_get (fd->inode, this, &tmp_fctx);
+        if (!tmp_fctx) {
+                op_errno = EINVAL;
+                goto err;
+        }
+        fctx = (stripe_fd_ctx_t *)(long)tmp_fctx;
+        stripe_size = fctx->stripe_size;
+
+        STRIPE_VALIDATE_FCTX (fctx, err);
+
+        remaining_size = len;
+
+        local = mem_get0 (this->local_pool);
+        if (!local) {
+                op_errno = ENOMEM;
+                goto err;
+        }
+        fctx = (stripe_fd_ctx_t *)(long)tmp_fctx;
+        stripe_size = fctx->stripe_size;
+
+        STRIPE_VALIDATE_FCTX (fctx, err);
+
+        remaining_size = len;
+
+        local = mem_get0 (this->local_pool);
+        if (!local) {
+                op_errno = ENOMEM;
+                goto err;
+        }
+        fctx = (stripe_fd_ctx_t *)(long)tmp_fctx;
+        stripe_size = fctx->stripe_size;
+
+        STRIPE_VALIDATE_FCTX (fctx, err);
+
+        remaining_size = len;
+
+        local = mem_get0 (this->local_pool);
+        if (!local) {
+                op_errno = ENOMEM;
+                goto err;
+        }
+        frame->local = local;
+        local->stripe_size = stripe_size;
+        local->fctx = fctx;
+
+        if (!stripe_size) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "Wrong stripe size for the file");
+                op_errno = EINVAL;
+                goto err;
+        }
+
+        while (1) {
+                fframe = copy_frame(frame);
+                flocal = mem_get0(this->local_pool);
+                if (!flocal) {
+                        op_errno = ENOMEM;
+                        goto err;
+                }
+                flocal->orig_frame = frame;
+                fframe->local = flocal;
+
+                idx = (((offset + offset_offset) /
+                        local->stripe_size) % fctx->stripe_count);
+
+                fill_size = (local->stripe_size -
+                             ((offset + offset_offset) % local->stripe_size));
+                if (fill_size > remaining_size)
+                        fill_size = remaining_size;
+
+                remaining_size -= fill_size;
+
+                local->wind_count++;
+                if (remaining_size == 0)
+                        local->unwind = 1;
+
+                dest_offset = offset + offset_offset;
+                if (fctx->stripe_coalesce)
+                        dest_offset = coalesced_offset(dest_offset,
+                                                       local->stripe_size,
+                                                       fctx->stripe_count);
+
+                STACK_WIND(fframe, stripe_zerofill_cbk, fctx->xl_array[idx],
+                           fctx->xl_array[idx]->fops->zerofill, fd,
+                           dest_offset, fill_size, xdata);
+                offset_offset += fill_size;
+                if (remaining_size == 0)
+                        break;
+        }
+
+        return 0;
+err:
+        if (fframe)
+                STRIPE_STACK_DESTROY(fframe);
+
+        STRIPE_STACK_UNWIND (zerofill, frame, -1, op_errno, NULL, NULL, NULL);
+        return 0;
+}
+
+int32_t
 stripe_release (xlator_t *this, fd_t *fd)
 {
 	return 0;
@@ -3947,6 +4465,37 @@ stripe_setxattr_cbk (call_frame_t *frame, void *cookie,
         return 0;
 }
 
+#ifdef HAVE_BD_XLATOR
+int
+stripe_is_bd (dict_t *this, char *key, data_t *value, void *data)
+{
+        gf_boolean_t *is_bd = data;
+
+        if (data == NULL)
+                return 0;
+
+        if (XATTR_IS_BD (key))
+            *is_bd = _gf_true;
+
+        return 0;
+}
+
+inline gf_boolean_t
+stripe_setxattr_is_bd (dict_t *dict)
+{
+        gf_boolean_t is_bd = _gf_false;
+
+        if (dict == NULL)
+                goto out;
+
+        dict_foreach (dict, stripe_is_bd, &is_bd);
+out:
+        return is_bd;
+}
+#else
+#define stripe_setxattr_is_bd(dict) _gf_false
+#endif
+
 int
 stripe_setxattr (call_frame_t *frame, xlator_t *this,
                  loc_t *loc, dict_t *dict, int flags, dict_t *xdata)
@@ -3956,6 +4505,7 @@ stripe_setxattr (call_frame_t *frame, xlator_t *this,
         stripe_private_t *priv     = NULL;
         stripe_local_t   *local    = NULL;
         int               i        = 0;
+        gf_boolean_t      is_bd    = _gf_false;
 
         VALIDATE_OR_GOTO (frame, err);
         VALIDATE_OR_GOTO (this, err);
@@ -3978,11 +4528,15 @@ stripe_setxattr (call_frame_t *frame, xlator_t *this,
         local->wind_count = priv->child_count;
         local->op_ret = local->op_errno = 0;
 
+        is_bd = stripe_setxattr_is_bd (dict);
+
         /**
          * Set xattrs for directories on all subvolumes. Additionally
-         * this power is only given to a special client.
+         * this power is only given to a special client. Bd xlator
+         * also needs xattrs for regular files (ie LVs)
          */
-        if ((frame->root->pid == GF_CLIENT_PID_GSYNCD) && IA_ISDIR (loc->inode->ia_type)) {
+        if (((frame->root->pid == GF_CLIENT_PID_GSYNCD) &&
+             IA_ISDIR (loc->inode->ia_type)) || is_bd) {
                 for (i = 0; i < priv->child_count; i++, trav = trav->next) {
                         STACK_WIND (frame, stripe_setxattr_cbk,
                                     trav->xlator, trav->xlator->fops->setxattr,
@@ -4013,21 +4567,21 @@ stripe_fsetxattr_cbk (call_frame_t *frame, void *cookie,
 
 
 int
-stripe_is_lockinfo (dict_t *this,
-                    char *key,
-                    data_t *value,
-                    void *data)
+stripe_is_special_key (dict_t *this,
+                       char *key,
+                       data_t *value,
+                       void *data)
 {
-        gf_boolean_t *is_lockinfo = NULL;
+        gf_boolean_t *is_special = NULL;
 
         if (data == NULL) {
                 goto out;
         }
 
-        is_lockinfo = data;
+        is_special = data;
 
-        if (XATTR_IS_LOCKINFO (key))
-                *is_lockinfo = _gf_true;
+        if (XATTR_IS_LOCKINFO (key) || XATTR_IS_BD (key))
+                *is_special = _gf_true;
 
 out:
         return 0;
@@ -4104,7 +4658,7 @@ stripe_fsetxattr_is_special (dict_t *dict)
                 goto out;
         }
 
-        dict_foreach (dict, stripe_is_lockinfo, &is_spl);
+        dict_foreach (dict, stripe_is_special_key, &is_spl);
 
 out:
         return is_spl;
@@ -4866,10 +5420,10 @@ stripe_vgetxattr_cbk (call_frame_t *frame, void *cookie,
 
                         xattr->pos = cky;
                         xattr->xattr_value = gf_memdup (xattr_val,
-                                                        xattr->xattr_value,
                                                         xattr->xattr_len);
 
-                        local->xattr_total_len += xattr->xattr_len + 1;
+                        if (xattr->xattr_value != NULL)
+                                local->xattr_total_len += xattr->xattr_len + 1;
                 }
         }
  out:
@@ -4969,7 +5523,8 @@ stripe_getxattr (call_frame_t *frame, xlator_t *this,
                 if (cluster_getmarkerattr (frame, this, loc, name,
                                            local, stripe_getxattr_unwind,
                                            sub_volumes, priv->child_count,
-                                           MARKER_UUID_TYPE, priv->vol_uuid)) {
+                                           MARKER_UUID_TYPE, marker_uuid_default_gauge,
+                                           priv->vol_uuid)) {
                         op_errno = EINVAL;
                         goto err;
                 }
@@ -5048,6 +5603,7 @@ stripe_getxattr (call_frame_t *frame, xlator_t *this,
                                                    sub_volumes,
                                                    local->marker.call_count,
                                                    MARKER_XTIME_TYPE,
+                                                   marker_xtime_default_gauge,
                                                    priv->vol_uuid)) {
                                 op_errno = EINVAL;
                                 goto err;
@@ -5221,6 +5777,9 @@ struct xlator_fops fops = {
         .removexattr    = stripe_removexattr,
         .fremovexattr   = stripe_fremovexattr,
         .readdirp       = stripe_readdirp,
+	.fallocate	= stripe_fallocate,
+	.discard	= stripe_discard,
+        .zerofill       = stripe_zerofill,
 };
 
 struct xlator_cbks cbks = {
@@ -5246,10 +5805,10 @@ struct volume_options options[] = {
         },
 	{ .key = {"coalesce"},
 	  .type = GF_OPTION_TYPE_BOOL,
-	  .default_value = "false",
-	  .description = "Enable coalesce mode to flatten striped files as "
-			 "stored on the server (i.e., eliminate holes caused "
-			 "by the traditional format)."
+	  .default_value = "true",
+	  .description = "Enable/Disable coalesce mode to flatten striped "
+			 "files as stored on the server (i.e., eliminate holes "
+			 "caused by the traditional format)."
 	},
         { .key  = {NULL} },
 };
diff --git a/xlators/debug/io-stats/src/io-stats.c b/xlators/debug/io-stats/src/io-stats.c
index 63bb8fa90..7fb697ae4 100644
--- a/xlators/debug/io-stats/src/io-stats.c
+++ b/xlators/debug/io-stats/src/io-stats.c
@@ -1724,6 +1724,40 @@ io_stats_fstat_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
 
 
 int
+io_stats_fallocate_cbk(call_frame_t *frame, void *cookie, xlator_t *this,
+		       int32_t op_ret, int32_t op_errno, struct iatt *prebuf,
+		       struct iatt *postbuf, dict_t *xdata)
+{
+	UPDATE_PROFILE_STATS(frame, FALLOCATE);
+	STACK_UNWIND_STRICT(fallocate, frame, op_ret, op_errno, prebuf, postbuf,
+			    xdata);
+	return 0;
+}
+
+
+int
+io_stats_discard_cbk(call_frame_t *frame, void *cookie, xlator_t *this,
+		     int32_t op_ret, int32_t op_errno, struct iatt *prebuf,
+		     struct iatt *postbuf, dict_t *xdata)
+{
+	UPDATE_PROFILE_STATS(frame, DISCARD);
+	STACK_UNWIND_STRICT(discard, frame, op_ret, op_errno, prebuf, postbuf,
+			    xdata);
+	return 0;
+}
+
+int
+io_stats_zerofill_cbk(call_frame_t *frame, void *cookie, xlator_t *this,
+                     int32_t op_ret, int32_t op_errno, struct iatt *prebuf,
+                     struct iatt *postbuf, dict_t *xdata)
+{
+        UPDATE_PROFILE_STATS(frame, ZEROFILL);
+        STACK_UNWIND_STRICT(zerofill, frame, op_ret, op_errno, prebuf, postbuf,
+                            xdata);
+        return 0;
+}
+
+int
 io_stats_lk_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                  int32_t op_ret, int32_t op_errno, struct gf_flock *lock, dict_t *xdata)
 {
@@ -2392,6 +2426,45 @@ io_stats_fstat (call_frame_t *frame, xlator_t *this,
 
 
 int
+io_stats_fallocate(call_frame_t *frame, xlator_t *this, fd_t *fd, int32_t mode,
+		   off_t offset, size_t len, dict_t *xdata)
+{
+	START_FOP_LATENCY(frame);
+
+	STACK_WIND(frame, io_stats_fallocate_cbk, FIRST_CHILD(this),
+		   FIRST_CHILD(this)->fops->fallocate, fd, mode, offset, len,
+		   xdata);
+
+	return 0;
+}
+
+
+int
+io_stats_discard(call_frame_t *frame, xlator_t *this, fd_t *fd, off_t offset,
+		 size_t len, dict_t *xdata)
+{
+	START_FOP_LATENCY(frame);
+
+	STACK_WIND(frame, io_stats_discard_cbk, FIRST_CHILD(this),
+		   FIRST_CHILD(this)->fops->discard, fd, offset, len, xdata);
+
+	return 0;
+}
+
+int
+io_stats_zerofill(call_frame_t *frame, xlator_t *this, fd_t *fd, off_t offset,
+                 size_t len, dict_t *xdata)
+{
+        START_FOP_LATENCY(frame);
+
+        STACK_WIND(frame, io_stats_zerofill_cbk, FIRST_CHILD(this),
+                   FIRST_CHILD(this)->fops->zerofill, fd, offset, len, xdata);
+
+        return 0;
+}
+
+
+int
 io_stats_lk (call_frame_t *frame, xlator_t *this,
              fd_t *fd, int32_t cmd, struct gf_flock *lock, dict_t *xdata)
 {
@@ -2817,6 +2890,9 @@ struct xlator_fops fops = {
         .fxattrop    = io_stats_fxattrop,
         .setattr     = io_stats_setattr,
         .fsetattr    = io_stats_fsetattr,
+	.fallocate   = io_stats_fallocate,
+	.discard     = io_stats_discard,
+        .zerofill    = io_stats_zerofill,
 };
 
 struct xlator_cbks cbks = {
diff --git a/xlators/debug/trace/src/trace.c b/xlators/debug/trace/src/trace.c
index a9c11babe..c9d839356 100644
--- a/xlators/debug/trace/src/trace.c
+++ b/xlators/debug/trace/src/trace.c
@@ -3134,7 +3134,7 @@ init (xlator_t *this)
         gf_log (this->name, GF_LOG_DEBUG, "logging to history %s",
                 (conf->log_history == _gf_true)?"enabled":"disabled");
 
-        history = eh_new (history_size, _gf_false);
+        history = eh_new (history_size, _gf_false, NULL);
         if (!history) {
                 gf_log (this->name, GF_LOG_ERROR, "event history cannot be "
                         "initialized");
diff --git a/xlators/encryption/Makefile.am b/xlators/encryption/Makefile.am
index 2cbde680f..36efc6698 100644
--- a/xlators/encryption/Makefile.am
+++ b/xlators/encryption/Makefile.am
@@ -1,3 +1,3 @@
-SUBDIRS = rot-13
+SUBDIRS = rot-13 crypt
 
 CLEANFILES = 
diff --git a/xlators/encryption/crypt/Makefile.am b/xlators/encryption/crypt/Makefile.am
new file mode 100644
index 000000000..d471a3f92
--- /dev/null
+++ b/xlators/encryption/crypt/Makefile.am
@@ -0,0 +1,3 @@
+SUBDIRS = src
+
+CLEANFILES = 
diff --git a/xlators/encryption/crypt/src/Makefile.am b/xlators/encryption/crypt/src/Makefile.am
new file mode 100644
index 000000000..faadd117f
--- /dev/null
+++ b/xlators/encryption/crypt/src/Makefile.am
@@ -0,0 +1,24 @@
+if ENABLE_CRYPT_XLATOR
+
+xlator_LTLIBRARIES = crypt.la
+xlatordir = $(libdir)/glusterfs/$(PACKAGE_VERSION)/xlator/encryption
+
+crypt_la_LDFLAGS = -module -avoidversion -lssl -lcrypto
+
+crypt_la_SOURCES = keys.c data.c metadata.c atom.c crypt.c
+crypt_la_LIBADD = $(top_builddir)/libglusterfs/src/libglusterfs.la
+
+noinst_HEADERS = crypt-common.h crypt-mem-types.h crypt.h metadata.h
+
+AM_CPPFLAGS = $(GF_CPPFLAGS) -I$(top_srcdir)/libglusterfs/src
+
+AM_CFLAGS = -Wall $(GF_CFLAGS)
+
+CLEANFILES =
+
+else
+
+noinst_DIST = keys.c data.c metadata.c atom.c crypt.c
+noinst_HEADERS = crypt-common.h crypt-mem-types.h crypt.h metadata.h
+
+endif
+\ No newline at end of file
diff --git a/xlators/encryption/crypt/src/atom.c b/xlators/encryption/crypt/src/atom.c
new file mode 100644
index 000000000..1ec41495c
--- /dev/null
+++ b/xlators/encryption/crypt/src/atom.c
@@ -0,0 +1,962 @@
+/*
+  Copyright (c) 2008-2013 Red Hat, Inc. <http://www.redhat.com>
+  This file is part of GlusterFS.
+
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
+*/
+
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+
+#include "defaults.h"
+#include "crypt-common.h"
+#include "crypt.h"
+
+/*
+ *                              Glossary
+ *
+ *
+ * cblock            (or cipher block). A logical unit in a file.
+ *                   cblock size is defined as the number of bits
+ *                   in an input (or output) block of the block
+ *                   cipher (*). Cipher block size is a property of
+ *                   cipher algorithm. E.g. cblock size is 64 bits
+ *                   for DES, 128 bits for AES, etc.
+ *
+ * atomic cipher     A cipher algorithm, which requires some chunks of
+ * algorithm         text to be padded at left and(or) right sides before
+ *                   cipher transaform.
+ *
+ *
+ * block (atom)      Minimal chunk of file's data, which doesn't require
+ *                   padding. We'll consider logical units in a file of
+ *                   block size (atom size).
+ *
+ * cipher algorithm  Atomic cipher algorithm, which requires the last
+ * with EOF issue    incomplete cblock in a file to be padded with some
+ *                   data (usually zeros).
+ *
+ *
+ * operation, which  reading/writing from offset, which is not aligned to
+ * forms a gap at    to atom size
+ * the beginning
+ *
+ *
+ * operation, which  reading/writing count bytes starting from offset off,
+ * forms a gap at    so that off+count is not aligned to atom_size
+ * the end
+ *
+ * head block        the first atom affected by an operation, which forms
+ *                   a gap at the beginning, or(and) at the end.
+ *                   Сomment. Head block has at least one gap (either at
+ *                   the beginning, or at the end)
+ *
+ *
+ * tail block        the last atom different from head, affected by an
+ *                   operation, which forms a gap at the end.
+ *                   Сomment: Tail block has exactly one gap (at the end).
+ *
+ *
+ * partial block     head or tail block
+ *
+ *
+ * full block        block without gaps.
+ *
+ *
+ * (*) Recommendation for Block Cipher Modes of Operation
+ *     Methods and Techniques
+ *     NIST Special Publication 800-38A Edition 2001
+ */
+
+/*
+ * atom->offset_at()
+ */
+static off_t offset_at_head(struct avec_config *conf)
+{
+	return conf->aligned_offset;
+}
+
+static off_t offset_at_hole_head(call_frame_t *frame,
+					 struct object_cipher_info *object)
+{
+	return offset_at_head(get_hole_conf(frame));
+}
+
+static off_t offset_at_data_head(call_frame_t *frame,
+					 struct object_cipher_info *object)
+{
+	return offset_at_head(get_data_conf(frame));
+}
+
+
+static off_t offset_at_tail(struct avec_config *conf,
+				    struct object_cipher_info *object)
+{
+	return conf->aligned_offset +
+		(conf->off_in_head ? get_atom_size(object) : 0) +
+		(conf->nr_full_blocks << get_atom_bits(object));
+}
+
+static off_t offset_at_hole_tail(call_frame_t *frame,
+					 struct object_cipher_info *object)
+{
+	return offset_at_tail(get_hole_conf(frame), object);
+}
+
+
+static off_t offset_at_data_tail(call_frame_t *frame,
+					 struct object_cipher_info *object)
+{
+	return offset_at_tail(get_data_conf(frame), object);
+}
+
+static off_t offset_at_full(struct avec_config *conf,
+				    struct object_cipher_info *object)
+{
+	return conf->aligned_offset +
+		(conf->off_in_head ? get_atom_size(object) : 0);
+}
+
+static off_t offset_at_data_full(call_frame_t *frame,
+					 struct object_cipher_info *object)
+{
+	return offset_at_full(get_data_conf(frame), object);
+}
+
+static off_t offset_at_hole_full(call_frame_t *frame,
+					 struct object_cipher_info *object)
+{
+	return offset_at_full(get_hole_conf(frame), object);
+}
+
+/*
+ * atom->io_size_nopad()
+ */
+
+static uint32_t io_size_nopad_head(struct avec_config *conf,
+				   struct object_cipher_info *object)
+{
+	uint32_t gap_at_beg;
+	uint32_t gap_at_end;
+
+	check_head_block(conf);
+
+	gap_at_beg = conf->off_in_head;
+
+	if (has_tail_block(conf) || has_full_blocks(conf) || conf->off_in_tail == 0 )
+		gap_at_end = 0;
+	else
+		gap_at_end = get_atom_size(object) - conf->off_in_tail;
+
+	return get_atom_size(object) - (gap_at_beg + gap_at_end);
+}
+
+static uint32_t io_size_nopad_tail(struct avec_config *conf,
+				   struct object_cipher_info *object)
+{
+	check_tail_block(conf);
+	return conf->off_in_tail;
+}
+
+static uint32_t io_size_nopad_full(struct avec_config *conf,
+				   struct object_cipher_info *object)
+{	
+	check_full_block(conf);
+	return get_atom_size(object);
+}
+
+static uint32_t io_size_nopad_data_head(call_frame_t *frame,
+					struct object_cipher_info *object)
+{
+	return io_size_nopad_head(get_data_conf(frame), object);
+}
+
+static uint32_t io_size_nopad_hole_head(call_frame_t *frame,
+					struct object_cipher_info *object)
+{
+	return io_size_nopad_head(get_hole_conf(frame), object);
+}
+
+static uint32_t io_size_nopad_data_tail(call_frame_t *frame,
+					struct object_cipher_info *object)
+{
+	return io_size_nopad_tail(get_data_conf(frame), object);
+}
+
+static uint32_t io_size_nopad_hole_tail(call_frame_t *frame,
+					struct object_cipher_info *object)
+{
+	return io_size_nopad_tail(get_hole_conf(frame), object);
+}
+
+static uint32_t io_size_nopad_data_full(call_frame_t *frame,
+					struct object_cipher_info *object)
+{
+	return io_size_nopad_full(get_data_conf(frame), object);
+}
+
+static uint32_t io_size_nopad_hole_full(call_frame_t *frame,
+					struct object_cipher_info *object)
+{
+	return io_size_nopad_full(get_hole_conf(frame), object);
+}
+
+static uint32_t offset_in_head(struct avec_config *conf)
+{
+	check_cursor_head(conf);
+
+	return conf->off_in_head;
+}
+
+static uint32_t offset_in_tail(call_frame_t *frame,
+			       struct object_cipher_info *object)
+{
+	return 0;
+}
+
+static uint32_t offset_in_full(struct avec_config *conf,
+			       struct object_cipher_info *object)
+{
+	check_cursor_full(conf);
+
+	if (has_head_block(conf))
+		return (conf->cursor - 1) << get_atom_bits(object);
+	else
+		return conf->cursor << get_atom_bits(object);
+}
+
+static uint32_t offset_in_data_head(call_frame_t *frame,
+				    struct object_cipher_info *object)
+{
+	return offset_in_head(get_data_conf(frame));
+}
+
+static uint32_t offset_in_hole_head(call_frame_t *frame,
+				    struct object_cipher_info *object)
+{
+	return offset_in_head(get_hole_conf(frame));
+}
+
+static uint32_t offset_in_data_full(call_frame_t *frame,
+				    struct object_cipher_info *object)
+{
+	return offset_in_full(get_data_conf(frame), object);
+}
+
+static uint32_t offset_in_hole_full(call_frame_t *frame,
+				    struct object_cipher_info *object)
+{
+	return offset_in_full(get_hole_conf(frame), object);
+}
+
+/*
+ * atom->rmw()
+ */
+/*
+ * Pre-conditions:
+ * @vec contains plain text of the latest
+ * version.
+ *
+ * Uptodate gaps of the @partial block with
+ * this plain text, encrypt the whole block
+ * and write the result to disk.
+ */
+static int32_t rmw_partial_block(call_frame_t *frame,
+				 void *cookie,
+				 xlator_t *this,
+				 int32_t op_ret,
+				 int32_t op_errno,
+				 struct iovec *vec,
+				 int32_t count,
+				 struct iatt *stbuf,
+				 struct iobref *iobref,
+				 struct rmw_atom *atom)
+{
+	size_t was_read = 0;
+	uint64_t file_size;
+	crypt_local_t *local = frame->local;
+	struct object_cipher_info *object = &local->info->cinfo;
+
+	struct iovec *partial = atom->get_iovec(frame, 0);
+	struct avec_config *conf = atom->get_config(frame);
+	end_writeback_handler_t end_writeback_partial_block;
+#if DEBUG_CRYPT
+	gf_boolean_t check_last_cblock = _gf_false;
+#endif
+	local->op_ret = op_ret;
+	local->op_errno = op_errno;
+
+	if (op_ret < 0)
+		goto exit;
+
+	file_size = local->cur_file_size;
+	was_read = op_ret;
+
+	if (atom->locality == HEAD_ATOM && conf->off_in_head) {
+		/*
+		 * head atom with a non-uptodate gap
+		 * at the beginning
+		 *
+		 * fill the gap with plain text of the
+		 * latest version. Convert a part of hole
+		 * (if any) to zeros.
+		 */
+		int32_t i;
+		int32_t copied = 0;
+		int32_t to_gap; /* amount of data needed to uptodate
+				   the gap at the beginning */
+#if 0
+		int32_t hole = 0; /* The part of the hole which
+				   * got in the head block */
+#endif /* 0 */
+		to_gap = conf->off_in_head;
+
+		if (was_read < to_gap) {
+			if (file_size >
+			    offset_at_head(conf) + was_read) {
+				/*
+				 * It is impossible to uptodate
+				 * head block: too few bytes have
+				 * been read from disk, so that
+				 * partial write is impossible.
+				 *
+				 * It could happen because of many
+				 * reasons: IO errors, (meta)data
+				 * corruption in the local file system,
+				 * etc.
+				 */
+				gf_log(this->name, GF_LOG_WARNING,
+				     "Can not uptodate a gap at the beginning");
+				local->op_ret = -1;
+				local->op_errno = EIO;
+				goto exit;
+			}
+#if 0
+			hole = to_gap - was_read;
+#endif /* 0 */
+			to_gap = was_read;
+		}
+		/*
+		 * uptodate the gap at the beginning
+		 */
+		for (i = 0; i < count && copied < to_gap; i++) {
+			int32_t to_copy;
+
+			to_copy = vec[i].iov_len;
+			if (to_copy > to_gap - copied)
+				to_copy = to_gap - copied;
+
+			memcpy(partial->iov_base, vec[i].iov_base, to_copy);
+			copied += to_copy;
+		}
+#if 0
+		/*
+		 * If possible, convert part of the
+		 * hole, which got in the head block
+		 */
+		ret = TRY_LOCK(&local->hole_lock);
+		if (!ret) {
+			if (local->hole_handled)
+				/*
+				 * already converted by
+				 * crypt_writev_cbk()
+				 */
+				UNLOCK(&local->hole_lock);
+			else {
+				/*
+				 * convert the part of the hole
+				 * which got in the head block
+				 * to zeros.
+				 *
+				 * Update the orig_offset to make
+				 * sure writev_cbk() won't care
+				 * about this part of the hole.
+				 *
+				 */
+				memset(partial->iov_base + to_gap, 0, hole);
+
+				conf->orig_offset -= hole;
+				conf->orig_size += hole;
+				UNLOCK(&local->hole_lock);
+			}
+		}
+		else /*
+		      * conversion is being performed
+		      * by crypt_writev_cbk()
+		      */
+			;
+#endif /* 0 */
+	}
+	if (atom->locality == TAIL_ATOM ||
+	    (!has_tail_block(conf) && conf->off_in_tail)) {
+		/*
+		 * tail atom, or head atom with a non-uptodate
+		 * gap at the end.
+		 *
+		 * fill the gap at the end of the block
+		 * with plain text of the latest version.
+		 * Pad the result, (if needed)
+		 */
+		int32_t i;
+		int32_t to_gap;
+		int copied;
+		off_t off_in_tail;
+		int32_t to_copy;
+
+		off_in_tail = conf->off_in_tail;
+		to_gap = conf->gap_in_tail;
+
+		if (to_gap && was_read < off_in_tail + to_gap) {
+			/*
+			 * It is impossible to uptodate
+			 * the gap at the end: too few bytes
+			 * have been read from disk, so that
+			 * partial write is impossible.
+			 *
+			 * It could happen because of many
+			 * reasons: IO errors, (meta)data
+			 * corruption in the local file system,
+			 * etc.
+			 */
+			gf_log(this->name, GF_LOG_WARNING,
+			       "Can not uptodate a gap at the end");
+			local->op_ret = -1;
+			local->op_errno = EIO;
+			goto exit;
+		}
+		/*
+		 * uptodate the gap at the end
+		 */
+		copied = 0;
+		to_copy = to_gap;
+		for(i = count - 1; i >= 0 && to_copy > 0; i--) {
+			uint32_t from_vec, off_in_vec;
+
+			off_in_vec = 0;
+			from_vec = vec[i].iov_len;
+			if (from_vec > to_copy) {
+				off_in_vec = from_vec - to_copy;
+				from_vec = to_copy;
+			}
+			memcpy(partial->iov_base +
+			       off_in_tail + to_gap - copied - from_vec,
+			       vec[i].iov_base + off_in_vec,
+			       from_vec);
+
+			gf_log(this->name, GF_LOG_DEBUG,
+			       "uptodate %d bytes at tail. Offset at target(source): %d(%d)",
+			       (int)from_vec,
+			       (int)off_in_tail + to_gap - copied - from_vec,
+			       (int)off_in_vec);
+
+			copied += from_vec;
+			to_copy -= from_vec;
+		}
+		partial->iov_len = off_in_tail + to_gap;
+
+		if (object_alg_should_pad(object)) {
+			int32_t resid = 0;
+			resid = partial->iov_len & (object_alg_blksize(object) - 1);
+			if (resid) {
+				/*
+				 * append a new EOF padding
+				 */
+				local->eof_padding_size =
+					object_alg_blksize(object) - resid;
+
+				gf_log(this->name, GF_LOG_DEBUG,
+				       "set padding size %d",
+				       local->eof_padding_size);
+
+				memset(partial->iov_base + partial->iov_len,
+				       1,
+				       local->eof_padding_size);
+				partial->iov_len += local->eof_padding_size;
+#if DEBUG_CRYPT
+				gf_log(this->name, GF_LOG_DEBUG,
+				       "pad cblock with %d zeros:",
+				       local->eof_padding_size);
+				dump_cblock(this,
+					    (unsigned char *)partial->iov_base +
+					    partial->iov_len - object_alg_blksize(object));
+				check_last_cblock = _gf_true;
+#endif
+			}
+		}
+	}
+	/*
+	 * encrypt the whole block
+	 */
+	encrypt_aligned_iov(object,
+			    partial,
+			    1,
+			    atom->offset_at(frame, object));
+#if DEBUG_CRYPT
+	if (check_last_cblock == _gf_true) {
+		gf_log(this->name, GF_LOG_DEBUG,
+		       "encrypt last cblock with offset %llu",
+		       (unsigned long long)atom->offset_at(frame, object));
+		dump_cblock(this, (unsigned char *)partial->iov_base +
+			    partial->iov_len - object_alg_blksize(object));
+	}
+#endif
+	set_local_io_params_writev(frame, object, atom,
+				   atom->offset_at(frame, object),
+				   iovec_get_size(partial, 1));
+	/*
+	 * write the whole block to disk
+	 */
+	end_writeback_partial_block = dispatch_end_writeback(local->fop);
+	conf->cursor ++;
+	STACK_WIND(frame,
+		   end_writeback_partial_block,
+		   FIRST_CHILD(this),
+		   FIRST_CHILD(this)->fops->writev,
+		   local->fd,
+		   partial,
+		   1,
+		   atom->offset_at(frame, object),
+		   local->flags,
+		   local->iobref_data,
+		   local->xdata);
+
+	gf_log("crypt", GF_LOG_DEBUG,
+	       "submit partial block: %d bytes from %d offset",
+	       (int)iovec_get_size(partial, 1),
+	       (int)atom->offset_at(frame, object));
+ exit:
+	return 0;
+}
+
+/*
+ * Perform a (read-)modify-write sequence.
+ * This should be performed only after approval
+ * of upper server-side manager, i.e. the caller
+ * needs to make sure this is his turn to rmw.
+ */
+void submit_partial(call_frame_t *frame,
+		    xlator_t *this,
+		    fd_t *fd,
+		    atom_locality_type ltype)
+{
+	int32_t ret;
+	dict_t *dict;
+	struct rmw_atom *atom;
+	crypt_local_t *local = frame->local;
+	struct object_cipher_info *object = &local->info->cinfo;
+
+	atom = atom_by_types(local->active_setup, ltype);
+	/*
+	 * To perform the "read" component of the read-modify-write
+	 * sequence the crypt translator does stack_wind to itself.
+	 * 
+	 * Pass current file size to crypt_readv()
+	 */
+	dict = dict_new();
+	if (!dict) {
+		/*
+		 * FIXME: Handle the error
+		 */
+		gf_log("crypt", GF_LOG_WARNING, "Can not alloc dict");
+		return;
+	}
+	ret = dict_set(dict,
+		       FSIZE_XATTR_PREFIX,
+		       data_from_uint64(local->cur_file_size));
+	if (ret) {
+		/*
+		 * FIXME: Handle the error
+		 */
+		dict_unref(dict);
+		gf_log("crypt", GF_LOG_WARNING, "Can not set dict");
+		goto exit;
+	}
+	STACK_WIND(frame,
+		   atom->rmw,
+		   this,
+		   this->fops->readv, /* crypt_readv */
+		   fd,
+		   atom->count_to_uptodate(frame, object), /* count */
+		   atom->offset_at(frame, object), /* offset to read from */
+		   0,
+		   dict);
+ exit:
+	dict_unref(dict);
+}
+
+/*
+ * submit blocks of FULL_ATOM type
+ */
+void submit_full(call_frame_t *frame, xlator_t *this)
+{
+	crypt_local_t *local = frame->local;
+	struct object_cipher_info *object = &local->info->cinfo;
+	struct rmw_atom *atom = atom_by_types(local->active_setup, FULL_ATOM);
+	uint32_t count; /* total number of full blocks to submit */
+	uint32_t granularity; /* number of blocks to submit in one iteration */
+
+	uint64_t off_in_file; /* start offset in the file, bytes */
+	uint32_t off_in_atom; /* start offset in the atom, blocks */
+	uint32_t blocks_written = 0; /* blocks written for this submit */
+
+	struct avec_config *conf = atom->get_config(frame);
+	end_writeback_handler_t end_writeback_full_block;
+	/*
+	 * Write full blocks by groups of granularity size.
+	 */
+	end_writeback_full_block = dispatch_end_writeback(local->fop);
+
+	if (is_ordered_mode(frame)) {
+		uint32_t skip = has_head_block(conf) ? 1 : 0;
+		count = 1;
+		granularity = 1;
+		/*
+		 * calculate start offset using cursor value;
+		 * here we should take into accout head block,
+		 * which corresponds to cursor value 0.
+		 */
+		off_in_file = atom->offset_at(frame, object) +
+			((conf->cursor - skip) << get_atom_bits(object));
+		off_in_atom = conf->cursor - skip;
+	}
+	else {
+		/*
+		 * in parallel mode
+		 */
+		count = conf->nr_full_blocks;
+		granularity = MAX_IOVEC;
+		off_in_file = atom->offset_at(frame, object);
+		off_in_atom = 0;
+	}
+	while (count) {
+		uint32_t blocks_to_write = count;
+
+		if (blocks_to_write > granularity)
+			blocks_to_write = granularity;
+		if (conf->type == HOLE_ATOM)
+			/*
+			 * reset iovec before encryption
+			 */
+			memset(atom->get_iovec(frame, 0)->iov_base,
+			       0,
+			       get_atom_size(object));
+		/*
+		 * encrypt the group
+		 */
+		encrypt_aligned_iov(object,
+				    atom->get_iovec(frame,
+						    off_in_atom +
+						    blocks_written),
+				    blocks_to_write,
+				    off_in_file + (blocks_written <<
+						   get_atom_bits(object)));
+		
+		set_local_io_params_writev(frame, object, atom,
+		        off_in_file + (blocks_written << get_atom_bits(object)),
+			blocks_to_write <<  get_atom_bits(object));
+
+		conf->cursor += blocks_to_write;
+
+		STACK_WIND(frame,
+			   end_writeback_full_block,
+			   FIRST_CHILD(this),
+			   FIRST_CHILD(this)->fops->writev,
+			   local->fd,
+			   atom->get_iovec(frame, off_in_atom + blocks_written),
+			   blocks_to_write,
+			   off_in_file + (blocks_written << get_atom_bits(object)),
+			   local->flags,
+			   local->iobref_data ? local->iobref_data : local->iobref,
+			   local->xdata);
+
+		gf_log("crypt", GF_LOG_DEBUG, "submit %d full blocks from %d offset",
+		       blocks_to_write,
+		       (int)(off_in_file + (blocks_written << get_atom_bits(object))));
+
+		count -= blocks_to_write;
+		blocks_written += blocks_to_write;
+	}
+	return;
+}
+
+static int32_t rmw_data_head(call_frame_t *frame,
+			     void *cookie,
+			     xlator_t *this,
+			     int32_t op_ret,
+			     int32_t op_errno,
+			     struct iovec *vec,
+			     int32_t count,
+			     struct iatt *stbuf,
+			     struct iobref *iobref,
+			     dict_t *xdata)
+{
+	return rmw_partial_block(frame,
+				 cookie,
+				 this,
+				 op_ret,
+				 op_errno,
+				 vec,
+				 count,
+				 stbuf,
+				 iobref,
+				 atom_by_types(DATA_ATOM, HEAD_ATOM));
+}
+
+static int32_t rmw_data_tail(call_frame_t *frame,
+			     void *cookie,
+			     xlator_t *this,
+			     int32_t op_ret,
+			     int32_t op_errno,
+			     struct iovec *vec,
+			     int32_t count,
+			     struct iatt *stbuf,
+			     struct iobref *iobref,
+			     dict_t *xdata)
+{
+	return rmw_partial_block(frame,
+				 cookie,
+				 this,
+				 op_ret,
+				 op_errno,
+				 vec,
+				 count,
+				 stbuf,
+				 iobref,
+				 atom_by_types(DATA_ATOM, TAIL_ATOM));
+}
+
+static int32_t rmw_hole_head(call_frame_t *frame,
+			     void *cookie,
+			     xlator_t *this,
+			     int32_t op_ret,
+			     int32_t op_errno,
+			     struct iovec *vec,
+			     int32_t count,
+			     struct iatt *stbuf,
+			     struct iobref *iobref,
+			     dict_t *xdata)
+{
+	return rmw_partial_block(frame,
+				 cookie,
+				 this,
+				 op_ret,
+				 op_errno,
+				 vec,
+				 count,
+				 stbuf,
+				 iobref,
+				 atom_by_types(HOLE_ATOM, HEAD_ATOM));
+}
+
+static int32_t rmw_hole_tail(call_frame_t *frame,
+			     void *cookie,
+			     xlator_t *this,
+			     int32_t op_ret,
+			     int32_t op_errno,
+			     struct iovec *vec,
+			     int32_t count,
+			     struct iatt *stbuf,
+			     struct iobref *iobref,
+			     dict_t *xdata)
+{
+	return rmw_partial_block(frame,
+				 cookie,
+				 this,
+				 op_ret,
+				 op_errno,
+				 vec,
+				 count,
+				 stbuf,
+				 iobref,
+				 atom_by_types(HOLE_ATOM, TAIL_ATOM));
+}
+
+/*
+ * atom->count_to_uptodate()
+ */
+static uint32_t count_to_uptodate_head(struct avec_config *conf,
+				       struct object_cipher_info *object)
+{
+	if (conf->acount == 1 && conf->off_in_tail)
+		return get_atom_size(object);
+	else
+		/* there is no need to read the whole head block */
+		return conf->off_in_head;
+}
+
+static uint32_t count_to_uptodate_tail(struct avec_config *conf,
+				       struct object_cipher_info *object)
+{
+	/* we need to read the whole tail block */
+	return get_atom_size(object);
+}
+
+static uint32_t count_to_uptodate_data_head(call_frame_t *frame,
+					    struct object_cipher_info *object)
+{
+	return count_to_uptodate_head(get_data_conf(frame), object);
+}
+
+static uint32_t count_to_uptodate_data_tail(call_frame_t *frame,
+					    struct object_cipher_info *object)
+{
+	return count_to_uptodate_tail(get_data_conf(frame), object);
+}
+
+static uint32_t count_to_uptodate_hole_head(call_frame_t *frame,
+					    struct object_cipher_info *object)
+{
+	return count_to_uptodate_head(get_hole_conf(frame), object);
+}
+
+static uint32_t count_to_uptodate_hole_tail(call_frame_t *frame,
+					    struct object_cipher_info *object)
+{
+	return count_to_uptodate_tail(get_hole_conf(frame), object);
+}
+
+/* atom->get_config() */
+
+static struct avec_config *get_config_data(call_frame_t *frame)
+{
+	return &((crypt_local_t *)frame->local)->data_conf;
+}
+
+static struct avec_config *get_config_hole(call_frame_t *frame)
+{
+	return &((crypt_local_t *)frame->local)->hole_conf;
+}
+
+/*
+ * atom->get_iovec()
+ */
+static struct iovec *get_iovec_hole_head(call_frame_t *frame,
+					 uint32_t count)
+{
+	struct avec_config *conf = get_hole_conf(frame);
+
+	return conf->avec;
+}
+
+static struct iovec *get_iovec_hole_full(call_frame_t *frame,
+					 uint32_t count)
+{
+	struct avec_config *conf = get_hole_conf(frame);
+
+	return conf->avec + (conf->off_in_head ? 1 : 0);
+}
+
+static inline struct iovec *get_iovec_hole_tail(call_frame_t *frame,
+						uint32_t count)
+{
+	struct avec_config *conf = get_hole_conf(frame);
+
+	return conf->avec + (conf->blocks_in_pool - 1);
+}
+
+static inline struct iovec *get_iovec_data_head(call_frame_t *frame,
+						uint32_t count)
+{
+	struct avec_config *conf = get_data_conf(frame);
+
+	return conf->avec;
+}
+
+static inline struct iovec *get_iovec_data_full(call_frame_t *frame,
+						uint32_t count)
+{
+	struct avec_config *conf = get_data_conf(frame);
+
+	return conf->avec + (conf->off_in_head ? 1 : 0) + count;
+}
+
+static inline struct iovec *get_iovec_data_tail(call_frame_t *frame,
+						uint32_t count)
+{
+	struct avec_config *conf = get_data_conf(frame);
+
+	return conf->avec +
+		(conf->off_in_head ? 1 : 0) +
+		conf->nr_full_blocks;
+}
+
+static struct rmw_atom atoms[LAST_DATA_TYPE][LAST_LOCALITY_TYPE] = {
+	[DATA_ATOM][HEAD_ATOM] =
+	{ .locality = HEAD_ATOM,
+	  .rmw = rmw_data_head,
+	  .offset_at = offset_at_data_head,
+	  .offset_in = offset_in_data_head,
+	  .get_iovec = get_iovec_data_head,
+	  .io_size_nopad = io_size_nopad_data_head,
+	  .count_to_uptodate = count_to_uptodate_data_head,
+	  .get_config = get_config_data
+	},
+	[DATA_ATOM][TAIL_ATOM] =
+	{ .locality = TAIL_ATOM,
+	  .rmw = rmw_data_tail,
+	  .offset_at = offset_at_data_tail,
+	  .offset_in = offset_in_tail,
+	  .get_iovec = get_iovec_data_tail,
+	  .io_size_nopad = io_size_nopad_data_tail,
+	  .count_to_uptodate = count_to_uptodate_data_tail,
+	  .get_config = get_config_data
+	},
+	[DATA_ATOM][FULL_ATOM] =
+	{ .locality = FULL_ATOM,
+	  .offset_at = offset_at_data_full,
+	  .offset_in = offset_in_data_full,
+	  .get_iovec = get_iovec_data_full,
+	  .io_size_nopad = io_size_nopad_data_full,
+	  .get_config = get_config_data
+	},
+	[HOLE_ATOM][HEAD_ATOM] =
+	{ .locality = HEAD_ATOM,
+	  .rmw = rmw_hole_head,
+	  .offset_at = offset_at_hole_head,
+	  .offset_in = offset_in_hole_head,
+	  .get_iovec = get_iovec_hole_head,
+	  .io_size_nopad = io_size_nopad_hole_head,
+	  .count_to_uptodate = count_to_uptodate_hole_head,
+	  .get_config = get_config_hole
+	},
+	[HOLE_ATOM][TAIL_ATOM] =
+	{ .locality = TAIL_ATOM,
+	  .rmw = rmw_hole_tail,
+	  .offset_at = offset_at_hole_tail,
+	  .offset_in = offset_in_tail,
+	  .get_iovec = get_iovec_hole_tail,
+	  .io_size_nopad = io_size_nopad_hole_tail,
+	  .count_to_uptodate = count_to_uptodate_hole_tail,
+	  .get_config = get_config_hole
+	},
+	[HOLE_ATOM][FULL_ATOM] =
+	{ .locality = FULL_ATOM,
+	  .offset_at = offset_at_hole_full,
+	  .offset_in = offset_in_hole_full,
+	  .get_iovec = get_iovec_hole_full,
+	  .io_size_nopad = io_size_nopad_hole_full,
+	  .get_config = get_config_hole
+	}
+};
+
+struct rmw_atom *atom_by_types(atom_data_type data,
+			       atom_locality_type locality)
+{
+	return &atoms[data][locality];
+}
+
+/*
+  Local variables:
+  c-indentation-style: "K&R"
+  mode-name: "LC"
+  c-basic-offset: 8
+  tab-width: 8
+  fill-column: 80
+  scroll-step: 1
+  End:
+*/
diff --git a/xlators/encryption/crypt/src/crypt-common.h b/xlators/encryption/crypt/src/crypt-common.h
new file mode 100644
index 000000000..7c212ad5d
--- /dev/null
+++ b/xlators/encryption/crypt/src/crypt-common.h
@@ -0,0 +1,141 @@
+/*
+  Copyright (c) 2008-2013 Red Hat, Inc. <http://www.redhat.com>
+  This file is part of GlusterFS.
+
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
+*/
+
+#ifndef __CRYPT_COMMON_H__
+#define __CRYPT_COMMON_H__
+
+#define INVAL_SUBVERSION_NUMBER (0xff)
+#define CRYPT_INVAL_OP   (GF_FOP_NULL)
+
+#define CRYPTO_FORMAT_PREFIX  "trusted.glusterfs.crypt.att.cfmt"
+#define FSIZE_XATTR_PREFIX    "trusted.glusterfs.crypt.att.size"
+#define SUBREQ_PREFIX         "trusted.glusterfs.crypt.msg.sreq"
+#define FSIZE_MSG_PREFIX      "trusted.glusterfs.crypt.msg.size"
+#define DE_MSG_PREFIX         "trusted.glusterfs.crypt.msg.dent"
+#define REQUEST_ID_PREFIX     "trusted.glusterfs.crypt.msg.rqid"
+#define MSGFLAGS_PREFIX       "trusted.glusterfs.crypt.msg.xfgs"
+
+
+/* messages for crypt_open() */
+#define MSGFLAGS_REQUEST_MTD_RLOCK   1 /* take read lock and don't unlock */
+#define MSGFLAGS_REQUEST_MTD_WLOCK   2 /* take write lock and don't unlock */
+
+#define AES_BLOCK_BITS (4) /* AES_BLOCK_SIZE == 1 << AES_BLOCK_BITS */
+
+#define noop   do {; } while (0)
+#define cassert(cond) ({ switch (-1) { case (cond): case 0: break; } })
+#define __round_mask(x, y) ((__typeof__(x))((y)-1))
+#define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1)
+
+/*
+ * Format of file's metadata
+ */
+struct crypt_format {
+	uint8_t loader_id;  /* version of metadata loader */
+	uint8_t versioned[0]; /* file's metadata of specific version */
+} __attribute__((packed));
+
+typedef enum {
+	AES_CIPHER_ALG,
+	LAST_CIPHER_ALG
+} cipher_alg_t;
+
+typedef enum {
+	XTS_CIPHER_MODE,
+	LAST_CIPHER_MODE
+} cipher_mode_t;
+
+typedef enum {
+	MTD_LOADER_V1,
+	LAST_MTD_LOADER
+} mtd_loader_id;
+
+static inline void msgflags_set_mtd_rlock(uint32_t *flags)
+{
+	*flags |= MSGFLAGS_REQUEST_MTD_RLOCK;
+}
+
+static inline void msgflags_set_mtd_wlock(uint32_t *flags)
+{
+	*flags |= MSGFLAGS_REQUEST_MTD_WLOCK;
+}
+
+static inline gf_boolean_t msgflags_check_mtd_rlock(uint32_t *flags)
+{
+	return *flags & MSGFLAGS_REQUEST_MTD_RLOCK;
+}
+
+static inline gf_boolean_t msgflags_check_mtd_wlock(uint32_t *flags)
+{
+	return *flags & MSGFLAGS_REQUEST_MTD_WLOCK;
+}
+
+static inline gf_boolean_t msgflags_check_mtd_lock(uint32_t *flags)
+{
+	return  msgflags_check_mtd_rlock(flags) ||
+		msgflags_check_mtd_wlock(flags);
+}
+
+/*
+ * returns number of logical blocks occupied
+ * (maybe partially) by @count bytes
+ * at offset @start.
+ */
+static inline off_t logical_blocks_occupied(uint64_t start, off_t count,
+					    int blkbits)
+{
+	return ((start + count - 1) >> blkbits) - (start >> blkbits) + 1;
+}
+
+/*
+ * are two bytes (represented by offsets @off1
+ * and @off2 respectively) in the same logical
+ * block.
+ */
+static inline int in_same_lblock(uint64_t off1, uint64_t off2,
+				 int blkbits)
+{
+	return off1 >> blkbits == off2 >> blkbits;
+}
+
+static inline void dump_cblock(xlator_t *this, unsigned char *buf)
+{
+	gf_log(this->name, GF_LOG_DEBUG,
+	       "dump cblock: %x %x %x %x %x %x %x %x %x %x %x %x %x %x %x %x",
+	       (buf)[0],
+	       (buf)[1],
+	       (buf)[2],
+	       (buf)[3],
+	       (buf)[4],
+	       (buf)[5],
+	       (buf)[6],
+	       (buf)[7],
+	       (buf)[8],
+	       (buf)[9],
+	       (buf)[10],
+	       (buf)[11],
+	       (buf)[12],
+	       (buf)[13],
+	       (buf)[14],
+	       (buf)[15]);
+}
+
+#endif /* __CRYPT_COMMON_H__ */
+
+/*
+  Local variables:
+  c-indentation-style: "K&R"
+  mode-name: "LC"
+  c-basic-offset: 8
+  tab-width: 8
+  fill-column: 80
+  scroll-step: 1
+  End:
+*/
diff --git a/xlators/encryption/crypt/src/crypt-mem-types.h b/xlators/encryption/crypt/src/crypt-mem-types.h
new file mode 100644
index 000000000..799727573
--- /dev/null
+++ b/xlators/encryption/crypt/src/crypt-mem-types.h
@@ -0,0 +1,43 @@
+/*
+  Copyright (c) 2008-2013 Red Hat, Inc. <http://www.redhat.com>
+  This file is part of GlusterFS.
+
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
+*/
+
+
+#ifndef __CRYPT_MEM_TYPES_H__
+#define __CRYPT_MEM_TYPES_H__
+
+#include "mem-types.h"
+
+enum gf_crypt_mem_types_ {
+	gf_crypt_mt_priv = gf_common_mt_end + 1,
+	gf_crypt_mt_inode,
+	gf_crypt_mt_data,
+	gf_crypt_mt_mtd,
+	gf_crypt_mt_loc,
+	gf_crypt_mt_iatt,
+	gf_crypt_mt_key,
+	gf_crypt_mt_iovec,
+	gf_crypt_mt_char,
+};
+
+#endif /* __CRYPT_MEM_TYPES_H__ */
+
+/*
+  Local variables:
+  c-indentation-style: "K&R"
+  mode-name: "LC"
+  c-basic-offset: 8
+  tab-width: 8
+  fill-column: 80
+  scroll-step: 1
+  End:
+*/
+
+
+
diff --git a/xlators/encryption/crypt/src/crypt.c b/xlators/encryption/crypt/src/crypt.c
new file mode 100644
index 000000000..db2e6d83c
--- /dev/null
+++ b/xlators/encryption/crypt/src/crypt.c
@@ -0,0 +1,4498 @@
+/*
+  Copyright (c) 2008-2012 Red Hat, Inc. <http://www.redhat.com>
+  This file is part of GlusterFS.
+
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
+*/
+#include <ctype.h>
+#include <sys/uio.h>
+
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+
+#include "glusterfs.h"
+#include "xlator.h"
+#include "logging.h"
+#include "defaults.h"
+
+#include "crypt-common.h"
+#include "crypt.h"
+
+static void init_inode_info_head(struct crypt_inode_info *info, fd_t *fd);
+static int32_t init_inode_info_tail(struct crypt_inode_info *info,
+				    struct master_cipher_info *master);
+static int32_t prepare_for_submit_hole(call_frame_t *frame, xlator_t *this,
+				       uint64_t from, off_t size);
+static int32_t load_file_size(call_frame_t *frame, void *cookie,
+			      xlator_t *this, int32_t op_ret, int32_t op_errno,
+			      dict_t *dict, dict_t *xdata);
+static void do_ordered_submit(call_frame_t *frame, xlator_t *this,
+			      atom_data_type dtype);
+static void do_parallel_submit(call_frame_t *frame, xlator_t *this,
+			       atom_data_type dtype);
+static void put_one_call_open(call_frame_t *frame);
+static void put_one_call_readv(call_frame_t *frame, xlator_t *this);
+static void put_one_call_writev(call_frame_t *frame, xlator_t *this);
+static void put_one_call_ftruncate(call_frame_t *frame, xlator_t *this);
+static void free_avec(struct iovec *avec, char **pool, int blocks_in_pool);
+static void free_avec_data(crypt_local_t *local);
+static void free_avec_hole(crypt_local_t *local);
+
+static crypt_local_t *crypt_alloc_local(call_frame_t *frame, xlator_t *this,
+					glusterfs_fop_t fop)
+{
+	crypt_local_t *local = NULL;
+
+	local = mem_get0(this->local_pool);
+	if (!local) {
+		gf_log(this->name, GF_LOG_ERROR, "out of memory");
+		return NULL;
+	}
+	local->fop = fop;
+	LOCK_INIT(&local->hole_lock);
+	LOCK_INIT(&local->call_lock);
+	LOCK_INIT(&local->rw_count_lock);
+
+	frame->local = local;
+	return local;
+}
+
+struct crypt_inode_info *get_crypt_inode_info(inode_t *inode, xlator_t *this)
+{
+	int ret;
+	uint64_t value = 0;
+	struct crypt_inode_info *info;
+
+	ret = inode_ctx_get(inode, this, &value);
+	if (ret == -1) {
+		gf_log (this->name, GF_LOG_WARNING,
+			"Can not get inode info");
+		return NULL;
+	}
+	info = (struct crypt_inode_info *)(long)value;
+	if (info == NULL) {
+		gf_log (this->name, GF_LOG_WARNING,
+			"Can not obtain inode info");
+		return NULL;
+	}
+	return info;
+}
+
+static struct crypt_inode_info *local_get_inode_info(crypt_local_t *local,
+						      xlator_t *this)
+{
+	if (local->info)
+		return local->info;
+	local->info = get_crypt_inode_info(local->fd->inode, this);
+	return local->info;
+}
+
+static struct crypt_inode_info *alloc_inode_info(crypt_local_t *local,
+						 loc_t *loc)
+{
+	struct crypt_inode_info *info;
+
+	info = GF_CALLOC(1, sizeof(*info), gf_crypt_mt_inode);
+	if (!info) {
+		local->op_ret = -1;
+		local->op_errno = ENOMEM;
+		gf_log ("crypt", GF_LOG_WARNING,
+			"Can not allocate inode info");
+		return NULL;
+	}
+	memset(info, 0, sizeof(*info));
+#if DEBUG_CRYPT
+	info->loc = GF_CALLOC(1, sizeof(*loc), gf_crypt_mt_loc);
+	if (!info->loc) {
+		gf_log("crypt", GF_LOG_WARNING, "Can not allocate loc");
+		GF_FREE(info);
+		return NULL;
+	}
+	if (loc_copy(info->loc, loc)){
+		GF_FREE(info->loc);
+		GF_FREE(info);
+		return NULL;
+	}
+#endif /* DEBUG_CRYPT */
+
+	local->info = info;
+	return info;
+}
+
+static void free_inode_info(struct crypt_inode_info *info)
+{
+#if DEBUG_CRYPT
+	loc_wipe(info->loc);
+	GF_FREE(info->loc);
+#endif
+	memset(info, 0, sizeof(*info));
+	GF_FREE(info);
+}
+
+int crypt_forget (xlator_t *this, inode_t *inode)
+{
+        uint64_t ctx_addr = 0;
+        if (!inode_ctx_del (inode, this, &ctx_addr))
+                free_inode_info((struct crypt_inode_info *)(long)ctx_addr);
+        return 0;
+}
+
+#if DEBUG_CRYPT
+static void check_read(call_frame_t *frame, xlator_t *this, int32_t read,
+		       struct iovec *vec, int32_t count, struct iatt *stbuf)
+{
+	crypt_local_t *local = frame->local;
+	struct object_cipher_info *object = get_object_cinfo(local->info);
+	struct avec_config *conf = &local->data_conf;
+	uint32_t resid = stbuf->ia_size & (object_alg_blksize(object) - 1);
+
+	if (read <= 0)
+		return;
+	if (read != iovec_get_size(vec, count))
+		gf_log ("crypt", GF_LOG_DEBUG,
+			"op_ret differs from amount of read bytes");
+
+	if (object_alg_should_pad(object) && (read & (object_alg_blksize(object) - 1)))
+		gf_log ("crypt", GF_LOG_DEBUG,
+			"bad amount of read bytes (!= 0 mod(cblock size))");
+
+	if (conf->aligned_offset + read >
+	    stbuf->ia_size + (resid ? object_alg_blksize(object) - resid : 0))
+		gf_log ("crypt", GF_LOG_DEBUG,
+			"bad amount of read bytes (too large))");
+
+}
+
+#define PT_BYTES_TO_DUMP (32)
+static void dump_plain_text(crypt_local_t *local, struct iovec *avec)
+{
+	int32_t to_dump;
+	char str[PT_BYTES_TO_DUMP + 1];
+
+	if (!avec)
+		return;
+	to_dump = avec->iov_len;
+	if (to_dump > PT_BYTES_TO_DUMP)
+		to_dump = PT_BYTES_TO_DUMP;
+	memcpy(str, avec->iov_base, to_dump);
+	memset(str + to_dump, '0', 1);
+	gf_log("crypt", GF_LOG_DEBUG, "Read file: %s", str);
+}
+
+static int32_t data_conf_invariant(struct avec_config *conf)
+{
+	return conf->acount ==
+		!!has_head_block(conf) +
+		!!has_tail_block(conf)+
+		conf->nr_full_blocks;
+}
+
+static int32_t hole_conf_invariant(struct avec_config *conf)
+{
+	return conf->blocks_in_pool ==
+		!!has_head_block(conf) +
+		!!has_tail_block(conf)+
+		!!has_full_blocks(conf);
+}
+
+static void crypt_check_conf(struct avec_config *conf)
+{
+	int32_t ret = 0;
+	const char *msg;
+
+	switch (conf->type) {
+	case DATA_ATOM:
+		msg = "data";
+		ret = data_conf_invariant(conf);
+		break;
+	case HOLE_ATOM:
+		msg = "hole";
+		ret = hole_conf_invariant(conf);
+		break;
+	default:
+		msg = "unknown";
+	}
+	if (!ret)
+		gf_log("crypt", GF_LOG_DEBUG, "bad %s conf", msg);
+}
+
+static void check_buf(call_frame_t *frame, xlator_t *this, struct iatt *buf)
+{
+	crypt_local_t *local = frame->local;
+	struct object_cipher_info *object = &local->info->cinfo;
+	uint64_t local_file_size;
+
+	switch(local->fop) {
+	case GF_FOP_FTRUNCATE:
+		return;
+	case GF_FOP_WRITE:
+		local_file_size = local->new_file_size;
+		break;
+	case GF_FOP_READ:
+		if (parent_is_crypt_xlator(frame, this))
+			return;
+		local_file_size = local->cur_file_size;
+		break;
+	default:
+		gf_log("crypt", GF_LOG_DEBUG, "bad file operation");
+		return;
+	}
+	if (buf->ia_size != round_up(local_file_size,
+					 object_alg_blksize(object)))
+		gf_log("crypt", GF_LOG_DEBUG,
+		       "bad ia_size in buf (%llu), should be %llu",
+		       (unsigned long long)buf->ia_size,
+		       (unsigned long long)round_up(local_file_size,
+						    object_alg_blksize(object)));
+}
+
+#else
+#define check_read(frame, this, op_ret, vec, count, stbuf) noop
+#define dump_plain_text(local, avec) noop
+#define crypt_check_conf(conf) noop
+#define check_buf(frame, this, buf) noop
+#endif /* DEBUG_CRYPT */
+
+/*
+ * Pre-conditions:
+ * @vec represents a ciphertext of expanded size and
+ * aligned offset.
+ *
+ * Compound a temporal vector @avec with block-aligned
+ * components, decrypt and fix it up to represent a chunk
+ * of data corresponding to the original size and offset.
+ * Pass the result to the next translator.
+ */
+int32_t crypt_readv_cbk(call_frame_t *frame,
+			void *cookie,
+			xlator_t *this,
+			int32_t op_ret,
+			int32_t op_errno,
+			struct iovec *vec,
+			int32_t count,
+			struct iatt *stbuf,
+			struct iobref *iobref,
+			dict_t *xdata)
+{
+	crypt_local_t *local = frame->local;
+	struct avec_config *conf = &local->data_conf;
+	struct object_cipher_info *object = &local->info->cinfo;
+
+	struct iovec *avec;
+	uint32_t i;
+	uint32_t to_vec;
+	uint32_t to_user;
+
+	check_buf(frame, this, stbuf);
+	check_read(frame, this, op_ret, vec, count, stbuf);
+
+	local->op_ret = op_ret;
+	local->op_errno = op_errno;
+	local->iobref = iobref_ref(iobref);
+
+	local->buf = *stbuf;
+	local->buf.ia_size = local->cur_file_size;
+
+	if (op_ret <= 0 || count == 0 || vec[0].iov_len == 0)
+		goto put_one_call;
+
+	if (conf->orig_offset >= local->cur_file_size) {
+		local->op_ret = 0;
+		goto put_one_call;
+	}
+	/* 
+	 * correct config params with real file size
+	 * and actual amount of bytes read
+	 */
+	set_config_offsets(frame, this,
+			   conf->orig_offset, op_ret, DATA_ATOM, 0);
+
+	if (conf->orig_offset + conf->orig_size > local->cur_file_size)
+		conf->orig_size = local->cur_file_size - conf->orig_offset;
+	/*
+	 * calculate amount of data to be returned
+	 * to user.
+	 */
+	to_user = op_ret;
+	if (conf->aligned_offset + to_user <= conf->orig_offset) {
+		gf_log(this->name, GF_LOG_WARNING, "Incomplete read");
+		local->op_ret = -1;
+		local->op_errno = EIO;
+		goto put_one_call;
+	}
+	to_user -= (conf->aligned_offset - conf->orig_offset);
+
+	if (to_user > conf->orig_size)
+		to_user = conf->orig_size;
+	local->rw_count = to_user;
+
+	op_errno = set_config_avec_data(this, local,
+					conf, object, vec, count);
+	if (op_errno) {
+		local->op_ret = -1;
+		local->op_errno = op_errno;
+		goto put_one_call;
+	}
+	avec = conf->avec;
+#if DEBUG_CRYPT
+	if (conf->off_in_tail != 0 &&
+	    conf->off_in_tail < object_alg_blksize(object) &&
+	    object_alg_should_pad(object))
+		gf_log(this->name, GF_LOG_DEBUG, "Bad offset in tail %d",
+		       conf->off_in_tail);
+	if (iovec_get_size(vec, count) != 0 &&
+	    in_same_lblock(conf->orig_offset + iovec_get_size(vec, count) - 1,
+			   local->cur_file_size - 1,
+			   object_alg_blkbits(object))) {
+		gf_log(this->name, GF_LOG_DEBUG, "Compound last cblock");
+		dump_cblock(this,
+			    (unsigned char *)(avec[conf->acount - 1].iov_base) +
+			    avec[conf->acount - 1].iov_len - object_alg_blksize(object));
+		dump_cblock(this,
+			    (unsigned char *)(vec[count - 1].iov_base) +
+			    vec[count - 1].iov_len - object_alg_blksize(object));
+	}
+#endif
+	decrypt_aligned_iov(object, avec,
+			    conf->acount, conf->aligned_offset);
+	/*
+	 * pass proper plain data to user
+	 */
+	avec[0].iov_base += (conf->aligned_offset - conf->orig_offset);
+	avec[0].iov_len  -= (conf->aligned_offset - conf->orig_offset);
+
+	to_vec = to_user;
+	for (i = 0; i < conf->acount; i++) {
+		if (avec[i].iov_len > to_vec)
+			avec[i].iov_len = to_vec;
+		to_vec -= avec[i].iov_len;
+	}
+ put_one_call:
+	put_one_call_readv(frame, this);
+	return 0;
+}
+
+static int32_t do_readv(call_frame_t *frame,
+			void *cookie,
+			xlator_t *this,
+			int32_t op_ret,
+			int32_t op_errno,
+			dict_t *dict,
+			dict_t *xdata)
+{
+	data_t *data;
+	crypt_local_t *local = frame->local;
+
+	if (op_ret < 0)
+		goto error;	
+	/*
+	 * extract regular file size
+	 */
+	data = dict_get(dict, FSIZE_XATTR_PREFIX);
+	if (!data) {
+		gf_log("crypt", GF_LOG_WARNING, "Regular file size not found");
+		op_errno = EIO;
+		goto error;
+	}
+	local->cur_file_size = data_to_uint64(data);
+	
+	get_one_call(frame);
+	STACK_WIND(frame,
+		   crypt_readv_cbk,
+		   FIRST_CHILD (this),
+		   FIRST_CHILD (this)->fops->readv,
+		   local->fd,
+		   /*
+		    * FIXME: read amount can be reduced
+		    */
+		   local->data_conf.expanded_size,
+		   local->data_conf.aligned_offset,
+		   local->flags,
+		   local->xdata);
+	return 0;
+ error:
+	local->op_ret = -1;
+	local->op_errno = op_errno;
+
+	get_one_call(frame);
+	put_one_call_readv(frame, this);
+	return 0;
+}
+
+static int32_t crypt_readv_finodelk_cbk(call_frame_t *frame,
+					void *cookie,
+					xlator_t *this,
+					int32_t op_ret,
+					int32_t op_errno,
+					dict_t *xdata)
+{
+	crypt_local_t *local = frame->local;
+
+	if (op_ret < 0)
+		goto error;
+	/*
+	 * An access has been granted,
+	 * retrieve file size
+	 */
+	STACK_WIND(frame,
+		   do_readv,
+		   FIRST_CHILD(this),
+		   FIRST_CHILD(this)->fops->fgetxattr,
+		   local->fd,
+		   FSIZE_XATTR_PREFIX,
+		   NULL);
+	return  0;
+ error:
+	fd_unref(local->fd);
+	if (local->xdata)
+		dict_unref(local->xdata);
+	STACK_UNWIND_STRICT(readv,
+			    frame,
+			    -1,
+			    op_errno,
+			    NULL,
+			    0,
+			    NULL,
+			    NULL,
+			    NULL);
+	return 0;
+}
+
+static int32_t readv_trivial_completion(call_frame_t *frame,
+					void *cookie,
+					xlator_t *this,
+					int32_t op_ret,
+					int32_t op_errno,
+					struct iatt *buf,
+					dict_t *xdata)
+{
+	crypt_local_t *local = frame->local;
+
+	local->op_ret = op_ret;
+	local->op_errno = op_errno;
+
+	if (op_ret < 0) {
+		gf_log(this->name, GF_LOG_WARNING,
+		       "stat failed (%d)", op_errno);
+		goto error;
+	}
+	local->buf = *buf;
+	STACK_WIND(frame,
+		   load_file_size,
+		   FIRST_CHILD(this),
+		   FIRST_CHILD(this)->fops->getxattr,
+		   local->loc,
+		   FSIZE_XATTR_PREFIX,
+		   NULL);
+	return 0;	
+ error:
+	STACK_UNWIND_STRICT(readv, frame, op_ret, op_errno,
+			    NULL, 0, NULL, NULL, NULL);
+	return 0;
+}
+
+int32_t crypt_readv(call_frame_t *frame,
+		    xlator_t *this,
+		    fd_t *fd,
+		    size_t size,
+		    off_t offset,
+		    uint32_t flags, dict_t *xdata)
+{
+	int32_t ret;
+	crypt_local_t *local;
+	struct crypt_inode_info *info;
+	struct gf_flock lock = {0, };
+
+#if DEBUG_CRYPT
+	gf_log("crypt", GF_LOG_DEBUG, "reading %d bytes from offset %llu",
+	       (int)size, (long long)offset);
+	if (parent_is_crypt_xlator(frame, this))
+		gf_log("crypt", GF_LOG_DEBUG, "parent is crypt");
+#endif	
+	local = crypt_alloc_local(frame, this, GF_FOP_READ);
+	if (!local) {
+		ret = ENOMEM;
+		goto error;
+	}
+	if (size == 0)
+		goto trivial;
+
+	local->fd = fd_ref(fd);
+	local->flags = flags;
+
+	info = local_get_inode_info(local, this);
+	if (info == NULL) {
+		ret = EINVAL;
+		fd_unref(fd);
+		goto error;
+	}
+	if (!object_alg_atomic(&info->cinfo)) {
+		ret = EINVAL;
+		fd_unref(fd);
+		goto error;
+	}
+	set_config_offsets(frame, this, offset, size,
+			   DATA_ATOM, 0);
+	if (parent_is_crypt_xlator(frame, this)) {
+		data_t *data;
+		/*
+		 * We are called by crypt_writev (or cypt_ftruncate)
+		 * to perform the "read" component of the read-modify-write
+		 * (or read-prune-write) sequence for some atom;
+		 *
+		 * don't ask for access:
+		 * it has already been acquired
+		 *
+		 * Retrieve current file size
+		 */
+		if (!xdata) {
+			gf_log("crypt", GF_LOG_WARNING,
+			       "Regular file size hasn't been passed");
+			ret = EIO;
+			goto error;
+		}
+		data = dict_get(xdata, FSIZE_XATTR_PREFIX);
+		if (!data) {
+			gf_log("crypt", GF_LOG_WARNING,
+			       "Regular file size not found");
+			ret = EIO;
+			goto error;
+		}
+		local->old_file_size =
+			local->cur_file_size = data_to_uint64(data);
+
+		get_one_call(frame);
+		STACK_WIND(frame,
+			   crypt_readv_cbk,
+			   FIRST_CHILD(this),
+			   FIRST_CHILD(this)->fops->readv,
+			   local->fd,
+			   /*
+			    * FIXME: read amount can be reduced
+			    */
+			   local->data_conf.expanded_size,
+			   local->data_conf.aligned_offset,
+			   flags,
+			   NULL);
+		return 0;
+	}
+	if (xdata)
+		local->xdata = dict_ref(xdata);
+
+	lock.l_len    = 0;
+        lock.l_start  = 0;
+        lock.l_type   = F_RDLCK;
+        lock.l_whence = SEEK_SET;
+
+	STACK_WIND(frame,
+		   crypt_readv_finodelk_cbk,
+		   FIRST_CHILD(this),
+		   FIRST_CHILD(this)->fops->finodelk,
+		   this->name,
+		   fd,
+		   F_SETLKW,
+		   &lock,
+		   NULL);
+	return 0;
+ trivial:
+	STACK_WIND(frame,
+		   readv_trivial_completion,
+		   FIRST_CHILD(this),
+		   FIRST_CHILD(this)->fops->fstat,
+		   fd,
+		   NULL);
+	return 0;
+ error:
+	STACK_UNWIND_STRICT(readv,
+			    frame,
+			    -1,
+			    ret,
+			    NULL,
+			    0,
+			    NULL,
+			    NULL,
+			    NULL);
+	return 0;
+}
+
+void set_local_io_params_writev(call_frame_t *frame,
+				struct object_cipher_info *object,
+				struct rmw_atom *atom,
+				off_t io_offset,
+				uint32_t io_size)
+{
+	crypt_local_t *local = frame->local;
+
+	local->io_offset = io_offset;
+	local->io_size = io_size;
+
+	local->io_offset_nopad =
+		atom->offset_at(frame, object) + atom->offset_in(frame, object);
+
+	gf_log("crypt", GF_LOG_DEBUG,
+	       "set nopad offset to %llu",
+	       (unsigned long long)local->io_offset_nopad);
+
+	local->io_size_nopad = atom->io_size_nopad(frame, object);
+
+	gf_log("crypt", GF_LOG_DEBUG,
+	       "set nopad size to %llu",
+	       (unsigned long long)local->io_size_nopad);
+
+	local->update_disk_file_size = 0;
+	/*
+	 * NOTE: eof_padding_size is 0 for all full atoms;
+	 * For head and tail atoms it will be set up at rmw_partial block()
+	 */
+	local->new_file_size = local->cur_file_size;
+
+	if (local->io_offset_nopad + local->io_size_nopad > local->cur_file_size) {
+
+		local->new_file_size = local->io_offset_nopad + local->io_size_nopad;
+
+		gf_log("crypt", GF_LOG_DEBUG,
+		       "set new file size to %llu",
+		       (unsigned long long)local->new_file_size);
+
+		local->update_disk_file_size = 1;
+	}
+}
+
+void set_local_io_params_ftruncate(call_frame_t *frame,
+				   struct object_cipher_info *object)
+{
+	uint32_t resid;
+	crypt_local_t *local = frame->local;
+	struct avec_config *conf = &local->data_conf;
+
+	resid = conf->orig_offset & (object_alg_blksize(object) - 1);
+	if (resid) {
+		local->eof_padding_size =
+			object_alg_blksize(object) - resid;
+		local->new_file_size = conf->aligned_offset;
+		local->update_disk_file_size = 0;
+		/*
+		 * file size will be updated
+		 * in the ->writev() stack,
+		 * when submitting file tail
+		 */
+	}
+	else {	
+		local->eof_padding_size = 0;
+		local->new_file_size = conf->orig_offset;
+		local->update_disk_file_size = 1;
+		/*
+		 * file size will be updated
+		 * in this ->ftruncate stack
+		 */
+	}
+}
+
+static inline void submit_head(call_frame_t *frame, xlator_t *this)
+{
+	crypt_local_t *local = frame->local;
+	submit_partial(frame, this, local->fd, HEAD_ATOM);
+}
+
+static inline void submit_tail(call_frame_t *frame, xlator_t *this)
+{
+	crypt_local_t *local = frame->local;
+	submit_partial(frame, this, local->fd, TAIL_ATOM);
+}
+
+static void submit_hole(call_frame_t *frame, xlator_t *this)
+{
+	/*
+	 * hole conversion always means
+	 * appended write and goes in ordered fashion
+	 */
+	do_ordered_submit(frame, this, HOLE_ATOM);
+}
+
+static void submit_data(call_frame_t *frame, xlator_t *this)
+{
+	if (is_ordered_mode(frame)) {
+		do_ordered_submit(frame, this, DATA_ATOM);
+		return;
+	}
+	gf_log("crypt", GF_LOG_WARNING, "Bad submit mode");
+	get_nr_calls(frame, nr_calls_data(frame));
+	do_parallel_submit(frame, this, DATA_ATOM);
+	return;
+}
+
+/*
+ * heplers called by writev_cbk, fruncate_cbk in ordered mode
+ */
+
+static inline int32_t should_submit_hole(crypt_local_t *local)
+{
+	struct avec_config *conf = &local->hole_conf;
+
+	return conf->avec != NULL;
+}
+
+static inline int32_t should_resume_submit_hole(crypt_local_t *local)
+{
+	struct avec_config *conf = &local->hole_conf;
+
+	if (local->fop == GF_FOP_WRITE && has_tail_block(conf))
+		/*
+		 * Don't submit a part of hole, which
+		 * fits into a data block:
+ 		 * this part of hole will be converted
+		 * as a gap filled by zeros in data head
+		 * block.
+		 */
+		return conf->cursor < conf->acount - 1;
+	else
+		return conf->cursor < conf->acount;
+}
+
+static inline int32_t should_resume_submit_data(call_frame_t *frame)
+{
+	crypt_local_t *local = frame->local;
+	struct avec_config *conf = &local->data_conf;
+
+	if (is_ordered_mode(frame))
+		return conf->cursor < conf->acount;
+	/*
+	 * parallel writes
+	 */
+	return 0;
+}
+
+static inline int32_t should_submit_data_after_hole(crypt_local_t *local)
+{
+	return local->data_conf.avec != NULL;
+}
+
+static void update_local_file_params(call_frame_t *frame,
+				     xlator_t *this,
+				     struct iatt *prebuf,
+				     struct iatt *postbuf)
+{
+	crypt_local_t *local = frame->local;
+
+	check_buf(frame, this, postbuf);
+
+	local->prebuf = *prebuf;
+	local->postbuf = *postbuf;
+
+	local->prebuf.ia_size  = local->cur_file_size;
+	local->postbuf.ia_size = local->new_file_size;
+
+	local->cur_file_size = local->new_file_size;	
+}
+
+static int32_t end_writeback_writev(call_frame_t *frame,
+				    void *cookie,
+				    xlator_t *this,
+				    int32_t op_ret,
+				    int32_t op_errno,
+				    struct iatt *prebuf,
+				    struct iatt *postbuf,
+				    dict_t *xdata)
+{
+	crypt_local_t *local = frame->local;
+
+	local->op_ret = op_ret;
+	local->op_errno = op_errno;
+
+	if (op_ret <= 0) {
+		gf_log(this->name, GF_LOG_WARNING,
+		       "writev iteration failed");
+		goto put_one_call;
+	}
+	/*
+	 * op_ret includes paddings (atom's head, atom's tail and EOF)
+	 */
+	if (op_ret < local->io_size) {
+		gf_log(this->name, GF_LOG_WARNING,
+		       "Incomplete writev iteration");
+		goto put_one_call;
+	}
+	op_ret -= local->eof_padding_size;
+	local->op_ret = op_ret;
+
+	update_local_file_params(frame, this, prebuf, postbuf);
+
+	if (data_write_in_progress(local)) {
+
+		LOCK(&local->rw_count_lock);
+		local->rw_count += op_ret;
+		UNLOCK(&local->rw_count_lock);
+
+		if (should_resume_submit_data(frame))
+			submit_data(frame, this);
+	}
+	else {
+		/*
+		 * hole conversion is going on;
+		 * don't take into account written zeros
+		 */
+		if (should_resume_submit_hole(local))
+			submit_hole(frame, this);
+
+		else if (should_submit_data_after_hole(local))
+			submit_data(frame, this);
+	}
+ put_one_call:
+	put_one_call_writev(frame, this);
+	return 0;
+}
+
+#define crypt_writev_cbk end_writeback_writev
+
+#define HOLE_WRITE_CHUNK_BITS 12
+#define HOLE_WRITE_CHUNK_SIZE (1 << HOLE_WRITE_CHUNK_BITS)
+
+/*
+ * Convert hole of size @size at offset @off to
+ * zeros and prepare respective iovecs for submit.
+ * The hole lock should be held.
+ *
+ * Pre-conditions:
+ * @local->file_size is set and valid.
+ */
+int32_t prepare_for_submit_hole(call_frame_t *frame, xlator_t *this,
+				uint64_t off, off_t size)
+{
+	int32_t ret;
+	crypt_local_t *local = frame->local;
+	struct object_cipher_info *object = &local->info->cinfo;
+
+	set_config_offsets(frame, this, off, size, HOLE_ATOM, 1);
+
+	ret = set_config_avec_hole(this, local,
+				   &local->hole_conf, object, local->fop);
+	crypt_check_conf(&local->hole_conf);
+
+	return ret;
+}
+
+/*
+ * prepare for submit @count bytes at offset @from
+ */
+int32_t prepare_for_submit_data(call_frame_t *frame, xlator_t *this,
+				off_t from, int32_t size, struct iovec *vec,
+				int32_t vec_count, int32_t setup_gap)
+{
+	uint32_t ret;
+	crypt_local_t *local = frame->local;
+	struct object_cipher_info *object = &local->info->cinfo;
+
+	set_config_offsets(frame, this, from, size,
+			   DATA_ATOM, setup_gap);
+
+	ret = set_config_avec_data(this, local,
+				   &local->data_conf, object, vec, vec_count);
+	crypt_check_conf(&local->data_conf);
+
+	return ret;
+}
+
+static void free_avec(struct iovec *avec,
+		      char **pool, int blocks_in_pool)
+{
+	if (!avec)
+		return;
+	GF_FREE(pool);
+	GF_FREE(avec);
+}
+
+static void free_avec_data(crypt_local_t *local)
+{
+	return free_avec(local->data_conf.avec,
+			 local->data_conf.pool,
+			 local->data_conf.blocks_in_pool);
+}
+
+static void free_avec_hole(crypt_local_t *local)
+{
+	return free_avec(local->hole_conf.avec,
+			 local->hole_conf.pool,
+			 local->hole_conf.blocks_in_pool);
+}
+
+
+static void do_parallel_submit(call_frame_t *frame, xlator_t *this,
+			       atom_data_type dtype)
+{
+	crypt_local_t *local = frame->local;
+	struct avec_config *conf;
+
+	local->active_setup = dtype;
+	conf = conf_by_type(frame, dtype);
+
+	if (has_head_block(conf))
+		submit_head(frame, this);
+
+	if (has_full_blocks(conf))
+		submit_full(frame, this);
+
+	if (has_tail_block(conf))
+		submit_tail(frame, this);
+	return;
+}
+
+static void do_ordered_submit(call_frame_t *frame, xlator_t *this,
+			      atom_data_type dtype)
+{
+	crypt_local_t *local = frame->local;
+	struct avec_config *conf;
+
+	local->active_setup = dtype;
+	conf = conf_by_type(frame, dtype);
+
+	if (should_submit_head_block(conf)) {
+		get_one_call_nolock(frame);
+		submit_head(frame, this);
+	}
+	else if (should_submit_full_block(conf)) {
+		get_one_call_nolock(frame);
+		submit_full(frame, this);
+	}
+	else if (should_submit_tail_block(conf)) {
+		get_one_call_nolock(frame);
+		submit_tail(frame, this);
+	}
+	else
+		gf_log("crypt", GF_LOG_DEBUG,
+		       "nothing has been submitted in ordered mode");
+	return;
+}
+
+static int32_t do_writev(call_frame_t *frame,
+			 void *cookie,
+			 xlator_t *this,
+			 int32_t op_ret,
+			 int32_t op_errno,
+			 dict_t *dict,
+			 dict_t *xdata)
+{
+	data_t *data;
+	crypt_local_t *local = frame->local;
+	struct object_cipher_info *object = &local->info->cinfo;
+	/*
+	 * extract regular file size
+	 */
+	data = dict_get(dict, FSIZE_XATTR_PREFIX);
+	if (!data) {
+		gf_log("crypt", GF_LOG_WARNING, "Regular file size not found");
+		op_ret = -1;
+		op_errno = EIO;
+		goto error;
+	}
+	local->old_file_size = local->cur_file_size = data_to_uint64(data);
+
+	set_gap_at_end(frame, object, &local->data_conf, DATA_ATOM);
+
+	if (local->cur_file_size < local->data_conf.orig_offset) {
+		/*
+		 * Set up hole config
+		 */
+		op_errno = prepare_for_submit_hole(frame,
+			       this,
+			       local->cur_file_size,
+			       local->data_conf.orig_offset - local->cur_file_size);
+		if (op_errno) {
+			local->op_ret = -1;
+			local->op_errno = op_errno;
+			goto error;
+		}
+	}
+	if (should_submit_hole(local))
+		submit_hole(frame, this);
+	else 
+		submit_data(frame, this);
+	return 0;
+ error:
+	get_one_call_nolock(frame);
+	put_one_call_writev(frame, this);
+	return 0;
+}
+
+static int32_t crypt_writev_finodelk_cbk(call_frame_t *frame,
+					 void *cookie,
+					 xlator_t *this,
+					 int32_t op_ret,
+					 int32_t op_errno,
+					 dict_t *xdata)
+{
+	crypt_local_t *local = frame->local;
+
+	local->op_ret = op_ret;
+	local->op_errno = op_errno;
+
+	if (op_ret < 0)
+		goto error;
+	/*
+	 * An access has been granted,
+	 * retrieve file size first
+	 */
+	STACK_WIND(frame,
+		   do_writev,
+		   FIRST_CHILD(this),
+		   FIRST_CHILD(this)->fops->fgetxattr,
+		   local->fd,
+		   FSIZE_XATTR_PREFIX,
+		   NULL);
+	return 0;
+ error:
+	get_one_call_nolock(frame);
+	put_one_call_writev(frame, this);
+	return 0;	
+}
+
+static int32_t writev_trivial_completion(call_frame_t *frame,
+					 void *cookie,
+					 xlator_t *this,
+					 int32_t op_ret,
+					 int32_t op_errno,
+					 struct iatt *buf,
+					 dict_t *dict)
+{
+	crypt_local_t *local = frame->local;
+	
+	local->op_ret = op_ret;
+	local->op_errno = op_errno;
+	local->prebuf = *buf;
+	local->postbuf = *buf;
+
+	local->prebuf.ia_size = local->cur_file_size;
+	local->postbuf.ia_size = local->cur_file_size;
+
+	get_one_call(frame);
+	put_one_call_writev(frame, this);
+	return 0;
+}
+
+int crypt_writev(call_frame_t *frame,
+		 xlator_t *this,
+		 fd_t *fd,
+		 struct iovec *vec,
+		 int32_t count,
+		 off_t offset,
+		 uint32_t flags,
+		 struct iobref *iobref,
+		 dict_t *xdata)
+{
+	int32_t ret;
+	crypt_local_t *local;
+	struct crypt_inode_info *info;
+	struct gf_flock lock = {0, };
+#if DEBUG_CRYPT
+	gf_log ("crypt", GF_LOG_DEBUG, "writing %d bytes from offset %llu",
+		(int)iovec_get_size(vec, count), (long long)offset);
+#endif
+	local = crypt_alloc_local(frame, this, GF_FOP_WRITE);
+	if (!local) {
+		ret = ENOMEM;
+		goto error;
+	}
+	local->fd = fd_ref(fd);
+
+	if (iobref)
+		local->iobref = iobref_ref(iobref);
+	/*
+	 * to update real file size on the server
+	 */
+	local->xattr = dict_new();
+	if (!local->xattr) {
+		ret = ENOMEM;
+		goto error;
+	}
+	local->flags = flags;
+
+	info = local_get_inode_info(local, this);
+	if (info == NULL) {
+		ret = EINVAL;
+		goto error;
+	}
+	if (!object_alg_atomic(&info->cinfo)) {
+		ret = EINVAL;
+		goto error;
+	}
+	if (iovec_get_size(vec, count) == 0)
+		goto trivial;
+
+	ret = prepare_for_submit_data(frame, this, offset,
+				      iovec_get_size(vec, count),
+				      vec, count, 0 /* don't setup gup
+						       in tail: we don't
+						       know file size yet */);
+	if (ret)
+		goto error;
+
+	if (parent_is_crypt_xlator(frame, this)) {
+		data_t *data;
+		/*
+		 * we are called by shinking crypt_ftruncate(),
+		 * which doesn't perform hole conversion;
+		 *
+		 * don't ask for access:
+		 * it has already been acquired
+		 */
+
+		/*
+		 * extract file size
+		 */
+		if (!xdata) {
+			gf_log("crypt", GF_LOG_WARNING,
+			       "Regular file size hasn't been passed");
+			ret = EIO;
+			goto error;
+		}
+		data = dict_get(xdata, FSIZE_XATTR_PREFIX);
+		if (!data) {
+			gf_log("crypt", GF_LOG_WARNING,
+			       "Regular file size not found");
+			ret = EIO;
+			goto error;
+		}
+		local->old_file_size =
+			local->cur_file_size = data_to_uint64(data);
+
+		submit_data(frame, this);
+		return 0;
+	}
+	if (xdata)
+		local->xdata = dict_ref(xdata);
+	/*
+	 * lock the file and retrieve its size
+	 */
+	lock.l_len    = 0;
+        lock.l_start  = 0;
+        lock.l_type   = F_WRLCK;
+        lock.l_whence = SEEK_SET;
+
+	STACK_WIND(frame,
+		   crypt_writev_finodelk_cbk,
+		   FIRST_CHILD(this),
+		   FIRST_CHILD(this)->fops->finodelk,
+		   this->name,
+		   fd,
+		   F_SETLKW,
+		   &lock,
+		   NULL);
+	return 0;
+ trivial:
+	STACK_WIND(frame,
+		   writev_trivial_completion,
+		   FIRST_CHILD(this),
+		   FIRST_CHILD(this)->fops->fstat,
+		   fd,
+		   NULL);
+	return 0;
+ error:
+	if (local && local->fd)
+		fd_unref(fd);
+	if (local && local->iobref)
+		iobref_unref(iobref);
+	if (local && local->xdata)
+		dict_unref(xdata);
+	if (local && local->xattr)
+		dict_unref(local->xattr);
+	if (local && local->info)
+		free_inode_info(local->info);
+
+	STACK_UNWIND_STRICT(writev, frame, -1, ret, NULL, NULL, NULL);
+	return 0;
+}
+
+int32_t prepare_for_prune(call_frame_t *frame, xlator_t *this, uint64_t offset)
+{
+	set_config_offsets(frame, this,
+			   offset,
+			   0, /* count */
+			   DATA_ATOM,
+			   0 /* since we prune, there is no
+				gap in tail to uptodate */);
+	return 0;
+}
+
+/*
+ * Finish the read-prune-modify sequence
+ *
+ * Can be invoked as
+ * 1) ->ftruncate_cbk() for cblock-aligned, or trivial prune
+ * 2) ->writev_cbk() for non-cblock-aligned prune
+ */
+
+static int32_t prune_complete(call_frame_t *frame,
+			      void *cookie,
+			      xlator_t *this,
+			      int32_t op_ret,
+			      int32_t op_errno,
+			      struct iatt *prebuf,
+			      struct iatt *postbuf,
+			      dict_t *xdata)
+{
+	crypt_local_t *local = frame->local;
+
+	local->op_ret = op_ret;
+	local->op_errno = op_errno;
+
+	update_local_file_params(frame, this, prebuf, postbuf);
+
+	put_one_call_ftruncate(frame, this);
+	return 0;
+}
+
+/*
+ * This is called as ->ftruncate_cbk()
+ *
+ * Perform the "write" component of the
+ * read-prune-write sequence.
+ *
+ * submuit the rest of the file
+ */
+static int32_t prune_submit_file_tail(call_frame_t *frame,
+				      void *cookie,
+				      xlator_t *this,
+				      int32_t op_ret,
+				      int32_t op_errno,
+				      struct iatt *prebuf,
+				      struct iatt *postbuf,
+				      dict_t *xdata)
+{
+	crypt_local_t *local = frame->local;
+	struct avec_config *conf = &local->data_conf;
+	dict_t *dict;
+
+	if (op_ret < 0)
+		goto put_one_call;
+
+	if (local->xdata) {
+		dict_unref(local->xdata);
+		local->xdata = NULL;
+	}
+	if (xdata)
+		local->xdata = dict_ref(xdata);
+
+	dict = dict_new();
+	if (!dict) {
+		op_errno = ENOMEM;
+		goto error;
+	}
+
+	update_local_file_params(frame, this, prebuf, postbuf);
+	local->new_file_size = conf->orig_offset;
+
+	/*
+	 * The rest of the file is a partial block and, hence,
+	 * should be written via RMW sequence, so the crypt xlator
+	 * does STACK_WIND to itself.
+	 *
+	 * Pass current file size to crypt_writev()
+	 */
+	op_errno = dict_set(dict,
+			    FSIZE_XATTR_PREFIX,
+			    data_from_uint64(local->cur_file_size));
+	if (op_errno) {
+		gf_log("crypt", GF_LOG_WARNING,
+		       "can not set key to update file size");
+		dict_unref(dict);
+		goto error;
+	}
+	gf_log("crypt", GF_LOG_DEBUG,
+	       "passing current file size (%llu) to crypt_writev",
+	       (unsigned long long)local->cur_file_size);
+	/*
+	 * Padding will be filled with
+	 * zeros by rmw_partial_block()
+	 */
+	STACK_WIND(frame,
+		   prune_complete,
+		   this,
+		   this->fops->writev, /* crypt_writev */
+		   local->fd,
+		   &local->vec,
+		   1,
+		   conf->aligned_offset, /* offset to write from */
+		   0,
+		   local->iobref,
+		   dict);
+
+	dict_unref(dict);
+	return 0;
+ error:
+	local->op_ret = -1;
+	local->op_errno = op_errno;
+ put_one_call:
+	put_one_call_ftruncate(frame, this);
+	return 0;
+}
+
+/*
+ * This is called as a callback of ->writev() invoked in behalf
+ * of ftruncate(): it can be
+ * 1) ordered writes issued by hole conversion in the case of
+ *    expanded truncate, or
+ * 2) an rmw partial data block issued by non-cblock-aligned
+ * prune.
+ */
+int32_t end_writeback_ftruncate(call_frame_t *frame,
+				void *cookie,
+				xlator_t *this,
+				int32_t op_ret,
+				int32_t op_errno,
+				struct iatt *prebuf,
+				struct iatt *postbuf,
+				dict_t *xdata)
+{
+	crypt_local_t  *local = frame->local;
+	/*
+	 * if nothing has been written,
+	 * then it must be an error
+	 */
+	local->op_ret = op_ret;
+	local->op_errno = op_errno;
+
+	if (op_ret < 0)
+		goto put_one_call;
+
+	update_local_file_params(frame, this, prebuf, postbuf);
+
+	if (data_write_in_progress(local))
+		/* case (2) */
+		goto put_one_call;
+	/* case (1) */
+	if (should_resume_submit_hole(local))
+		submit_hole(frame, this);
+	/*
+	 * case of hole, when we should't resume
+	 */
+ put_one_call:
+	put_one_call_ftruncate(frame, this);
+	return 0;
+}
+
+/*
+ * Perform prune and write components of the
+ * read-prune-write sequence.
+ *
+ * Called as ->readv_cbk()
+ *
+ * Pre-conditions:
+ * @vec contains the latest atom of the file
+ * (plain text)
+ */
+static int32_t prune_write(call_frame_t *frame,
+			   void *cookie,
+			   xlator_t *this,
+			   int32_t op_ret,
+			   int32_t op_errno,
+			   struct iovec *vec,
+			   int32_t count,
+			   struct iatt *stbuf,
+			   struct iobref *iobref,
+			   dict_t *xdata)
+{
+	int32_t i;
+	size_t to_copy;
+	size_t copied = 0;
+	crypt_local_t *local = frame->local;
+	struct avec_config *conf = &local->data_conf;
+
+	local->op_ret = op_ret;
+	local->op_errno = op_errno;
+	if (op_ret == -1)
+		goto put_one_call;
+
+	/*
+	 * At first, uptodate head block
+	 */
+	if (iovec_get_size(vec, count) < conf->off_in_head) {
+		gf_log(this->name, GF_LOG_WARNING,
+		       "Failed to uptodate head block for prune");
+		local->op_ret = -1;
+		local->op_errno = EIO;
+		goto put_one_call;
+	}
+	local->vec.iov_len = conf->off_in_head;
+	local->vec.iov_base = GF_CALLOC(1, local->vec.iov_len,
+					gf_crypt_mt_data);
+
+	if (local->vec.iov_base == NULL) {
+		local->op_ret = -1;
+		local->op_errno = ENOMEM;
+	}
+	for (i = 0; i < count; i++) {
+		to_copy = vec[i].iov_len;
+		if (to_copy > local->vec.iov_len - copied)
+			to_copy = local->vec.iov_len - copied;
+
+		memcpy((char *)local->vec.iov_base + copied,
+		       vec[i].iov_base,
+		       to_copy);
+		copied += to_copy;
+		if (copied == local->vec.iov_len)
+			break;
+	}
+	/*
+	 * perform prune with aligned offset
+	 * (i.e. at this step we prune a bit
+	 * more then it is needed
+	 */
+	STACK_WIND(frame,
+		   prune_submit_file_tail,
+		   FIRST_CHILD(this),
+		   FIRST_CHILD(this)->fops->ftruncate,
+		   local->fd,
+		   conf->aligned_offset,
+		   local->xdata);
+	return 0;
+ put_one_call:
+	put_one_call_ftruncate(frame, this);
+	return 0;
+}
+
+/*
+ * Perform a read-prune-write sequence
+ */
+int32_t read_prune_write(call_frame_t *frame, xlator_t *this)
+{
+	int32_t ret = 0;
+	dict_t *dict = NULL;
+	crypt_local_t  *local = frame->local;
+	struct avec_config *conf = &local->data_conf;
+	struct object_cipher_info *object = &local->info->cinfo;
+
+	set_local_io_params_ftruncate(frame, object);
+	get_one_call_nolock(frame);
+
+	if ((conf->orig_offset & (object_alg_blksize(object) - 1)) == 0) {
+		/*
+		 * cblock-aligned prune:
+		 * we don't need read and write components,
+		 * just cut file body
+		 */
+		gf_log("crypt", GF_LOG_DEBUG,
+		       "prune without RMW (at offset %llu",
+		       (unsigned long long)conf->orig_offset);
+
+		STACK_WIND(frame,
+			   prune_complete,
+			   FIRST_CHILD(this),
+			   FIRST_CHILD(this)->fops->ftruncate,
+			   local->fd,
+			   conf->orig_offset,
+			   local->xdata);
+		return 0;
+	}
+	gf_log("crypt", GF_LOG_DEBUG,
+	       "prune with RMW (at offset %llu",
+	       (unsigned long long)conf->orig_offset);	
+	/*
+	 * We are about to perform the "read" component of the
+	 * read-prune-write sequence. It means that we need to
+	 * read encrypted data from disk and decrypt it.
+	 * So, the crypt translator does STACK_WIND to itself.
+	 * 
+	 * Pass current file size to crypt_readv()
+	 
+	 */
+	dict = dict_new();
+	if (!dict) {
+		gf_log("crypt", GF_LOG_WARNING, "Can not alloc dict");
+		ret = ENOMEM;
+		goto exit;
+	}
+	ret = dict_set(dict,
+		       FSIZE_XATTR_PREFIX,
+		       data_from_uint64(local->cur_file_size));
+	if (ret) {
+		gf_log("crypt", GF_LOG_WARNING, "Can not set dict");
+		goto exit;
+	}
+	STACK_WIND(frame,
+		   prune_write,
+		   this,
+		   this->fops->readv, /* crypt_readv */
+		   local->fd,
+		   get_atom_size(object), /* bytes to read */
+		   conf->aligned_offset, /* offset to read from */
+		   0,
+		   dict);
+ exit:
+	if (dict)
+		dict_unref(dict);
+	return ret;
+}
+
+/*
+ * File prune is more complicated than expand.
+ * First we need to read the latest atom to not lose info
+ * needed for proper update. Also we need to make sure that
+ * every component of read-prune-write sequence leaves data
+ * consistent
+ *
+ * Non-cblock aligned prune is performed as read-prune-write
+ * sequence:
+ *
+ * 1) read the latest atom;
+ * 2) perform cblock-aligned prune
+ * 3) issue a write request for the end-of-file
+ */
+int32_t prune_file(call_frame_t *frame, xlator_t *this, uint64_t offset)
+{
+	int32_t ret;
+
+	ret = prepare_for_prune(frame, this, offset);
+	if (ret)
+		return ret;
+	return read_prune_write(frame, this);
+}
+
+int32_t expand_file(call_frame_t *frame, xlator_t *this,
+		    uint64_t offset)
+{
+	int32_t ret;
+	crypt_local_t *local = frame->local;
+
+	ret = prepare_for_submit_hole(frame, this,
+				      local->old_file_size,
+				      offset - local->old_file_size);
+	if (ret)
+		return ret;
+	submit_hole(frame, this);
+	return 0;
+}
+
+static int32_t ftruncate_trivial_completion(call_frame_t *frame,
+					    void *cookie,
+					    xlator_t *this,
+					    int32_t op_ret,
+					    int32_t op_errno,
+					    struct iatt *buf,
+					    dict_t *dict)
+{
+	crypt_local_t *local = frame->local;
+
+	local->op_ret = op_ret;
+	local->op_errno = op_errno;
+	local->prebuf = *buf;
+	local->postbuf = *buf;
+
+	local->prebuf.ia_size = local->cur_file_size;
+	local->postbuf.ia_size = local->cur_file_size;
+
+	get_one_call(frame);
+	put_one_call_ftruncate(frame, this);
+	return 0;
+}
+
+static int32_t do_ftruncate(call_frame_t *frame,
+			    void *cookie,
+			    xlator_t *this,
+			    int32_t op_ret,
+			    int32_t op_errno,
+			    dict_t *dict,
+			    dict_t *xdata)
+{
+	data_t *data;
+	crypt_local_t *local = frame->local;
+
+	if (op_ret)
+		goto error;	
+	/*
+	 * extract regular file size
+	 */
+	data = dict_get(dict, FSIZE_XATTR_PREFIX);
+	if (!data) {
+		gf_log("crypt", GF_LOG_WARNING, "Regular file size not found");
+		op_errno = EIO;
+		goto error;
+	}
+	local->old_file_size = local->cur_file_size = data_to_uint64(data);
+
+	if (local->data_conf.orig_offset == local->cur_file_size) {
+#if DEBUG_CRYPT
+		gf_log("crypt", GF_LOG_DEBUG,
+		       "trivial ftruncate (current file size %llu)",
+		       (unsigned long long)local->cur_file_size);
+#endif
+		goto trivial;
+	}
+	else if (local->data_conf.orig_offset < local->cur_file_size) {
+#if DEBUG_CRYPT
+		gf_log("crypt", GF_LOG_DEBUG, "prune from %llu to %llu",
+		       (unsigned long long)local->cur_file_size,
+		       (unsigned long long)local->data_conf.orig_offset);
+#endif
+		op_errno = prune_file(frame,
+				      this,
+				      local->data_conf.orig_offset);
+	}
+	else {
+#if DEBUG_CRYPT
+		gf_log("crypt", GF_LOG_DEBUG, "expand from %llu to %llu",
+		       (unsigned long long)local->cur_file_size,
+		       (unsigned long long)local->data_conf.orig_offset);
+#endif
+		op_errno = expand_file(frame,
+				       this,
+				       local->data_conf.orig_offset);
+	}
+	if (op_errno)
+		goto error;
+	return 0;
+ trivial:
+	STACK_WIND(frame,
+		   ftruncate_trivial_completion,
+		   FIRST_CHILD(this),
+		   FIRST_CHILD(this)->fops->fstat,
+		   local->fd,
+		   NULL);
+	return 0;
+ error:
+	/*
+	 * finish with ftruncate
+	 */
+	local->op_ret = -1;
+	local->op_errno = op_errno;
+
+	get_one_call_nolock(frame);
+	put_one_call_ftruncate(frame, this);
+	return 0;
+}
+
+static int32_t crypt_ftruncate_finodelk_cbk(call_frame_t *frame,
+					    void *cookie,
+					    xlator_t *this,
+					    int32_t op_ret,
+					    int32_t op_errno,
+					    dict_t *xdata)
+{
+	crypt_local_t *local = frame->local;
+
+	local->op_ret = op_ret;
+	local->op_errno = op_errno;
+
+	if (op_ret < 0)
+		goto error;
+	/*
+	 * An access has been granted,
+	 * retrieve file size first
+	 */
+	STACK_WIND(frame,
+		   do_ftruncate,
+		   FIRST_CHILD(this),
+		   FIRST_CHILD(this)->fops->fgetxattr,
+		   local->fd,
+		   FSIZE_XATTR_PREFIX,
+		   NULL);
+	return 0;
+ error:
+	get_one_call_nolock(frame);
+	put_one_call_ftruncate(frame, this);
+	return 0;
+}
+
+/*
+ * ftruncate is performed in 2 steps:
+ * . recieve file size;
+ * . expand or prune file.
+ */
+static int32_t crypt_ftruncate(call_frame_t *frame,
+			       xlator_t *this,
+			       fd_t *fd,
+			       off_t offset,
+			       dict_t *xdata)
+{
+	int32_t ret;
+	crypt_local_t *local;
+	struct crypt_inode_info *info;
+	struct gf_flock lock = {0, };
+
+	local = crypt_alloc_local(frame, this, GF_FOP_FTRUNCATE);
+	if (!local) {
+		ret = ENOMEM;
+		goto error;
+	}
+	local->xattr = dict_new();
+	if (!local->xattr) {
+		ret = ENOMEM;
+		goto error;
+	}
+	local->fd = fd_ref(fd);
+	info = local_get_inode_info(local, this);
+	if (info == NULL) {
+		ret = EINVAL;
+		goto error;
+	}
+	if (!object_alg_atomic(&info->cinfo)) {
+		ret = EINVAL;
+		goto error;
+	}
+	local->data_conf.orig_offset = offset;
+	if (xdata)
+		local->xdata = dict_ref(xdata);
+
+	lock.l_len    = 0;
+        lock.l_start  = 0;
+        lock.l_type   = F_WRLCK;
+        lock.l_whence = SEEK_SET;
+
+	STACK_WIND(frame,
+		   crypt_ftruncate_finodelk_cbk,
+		   FIRST_CHILD(this),
+		   FIRST_CHILD(this)->fops->finodelk,
+		   this->name,
+		   fd,
+		   F_SETLKW,
+		   &lock,
+		   NULL);
+	return 0;
+ error:
+	if (local && local->fd)
+		fd_unref(fd);
+	if (local && local->xdata)
+		dict_unref(xdata);
+	if (local && local->xattr)
+		dict_unref(local->xattr);
+	if (local && local->info)
+		free_inode_info(local->info);
+
+	STACK_UNWIND_STRICT(ftruncate, frame, -1, ret, NULL, NULL, NULL);
+	return 0;
+}
+
+/* ->flush_cbk() */
+int32_t truncate_end(call_frame_t *frame,
+		     void *cookie,
+		     xlator_t *this,
+		     int32_t op_ret,
+		     int32_t op_errno,
+		     dict_t *xdata)
+{
+	crypt_local_t *local = frame->local;
+
+	STACK_UNWIND_STRICT(truncate,
+			    frame,
+			    op_ret,
+			    op_errno,
+			    &local->prebuf,
+			    &local->postbuf,
+			    local->xdata);
+	return 0;
+}
+
+/* ftruncate_cbk() */
+int32_t truncate_flush(call_frame_t *frame,
+		       void *cookie,
+		       xlator_t *this,
+		       int32_t op_ret,
+		       int32_t op_errno,
+		       struct iatt *prebuf,
+		       struct iatt *postbuf,
+		       dict_t *xdata)
+{
+	crypt_local_t *local = frame->local;
+	fd_t *fd = local->fd;
+	local->prebuf = *prebuf;
+	local->postbuf = *postbuf;
+
+	STACK_WIND(frame,
+		   truncate_end,
+		   FIRST_CHILD(this),
+		   FIRST_CHILD(this)->fops->flush,
+		   fd,
+		   NULL);
+	fd_unref(fd);
+	return 0;
+}
+
+/*
+ * is called as ->open_cbk()
+ */
+static int32_t truncate_begin(call_frame_t *frame,
+			      void *cookie,
+			      xlator_t *this,
+			      int32_t op_ret,
+			      int32_t op_errno,
+			      fd_t *fd,
+			      dict_t *xdata)
+{
+	crypt_local_t *local = frame->local;
+
+	if (op_ret < 0) {
+		fd_unref(fd);
+		STACK_UNWIND_STRICT(truncate,
+				    frame,
+				    op_ret,
+				    op_errno, NULL, NULL, NULL);
+		return 0;
+	}
+	/*
+	 * crypt_truncate() is implemented via crypt_ftruncate(),
+	 * so the crypt xlator does STACK_WIND to itself here
+	 */
+	STACK_WIND(frame,
+		   truncate_flush,
+		   this,
+		   this->fops->ftruncate, /* crypt_ftruncate */
+		   fd,
+		   local->offset,
+		   NULL);
+	return 0;
+}
+
+/*
+ * crypt_truncate() is implemented via crypt_ftruncate() as a
+ * sequence crypt_open() - crypt_ftruncate() - truncate_flush()
+ */
+int32_t crypt_truncate(call_frame_t *frame,
+		       xlator_t *this,
+		       loc_t *loc,
+		       off_t offset,
+		       dict_t *xdata)
+{
+	fd_t *fd;
+	crypt_local_t *local;
+
+#if DEBUG_CRYPT
+	gf_log(this->name, GF_LOG_DEBUG,
+	       "truncate file %s at offset %llu",
+	       loc->path, (unsigned long long)offset);
+#endif
+	local = crypt_alloc_local(frame, this, GF_FOP_TRUNCATE);
+	if (!local)
+		goto error;
+
+	fd = fd_create(loc->inode, frame->root->pid);
+	if (!fd) {
+		gf_log(this->name, GF_LOG_ERROR, "Can not create fd");
+		goto error;
+	}
+	local->fd = fd;
+	local->offset = offset;
+	local->xdata = xdata;
+	STACK_WIND(frame,
+		   truncate_begin,
+		   this,
+		   this->fops->open, /* crypt_open() */
+		   loc,
+		   O_RDWR,
+		   fd,
+		   NULL);
+	return 0;
+ error:
+	STACK_UNWIND_STRICT(truncate, frame, -1, EINVAL, NULL, NULL, NULL);
+	return 0;
+}
+
+end_writeback_handler_t dispatch_end_writeback(glusterfs_fop_t fop)
+{
+	switch (fop) {
+	case GF_FOP_WRITE:
+		return end_writeback_writev;
+	case GF_FOP_FTRUNCATE:
+		return end_writeback_ftruncate;
+	default:
+		gf_log("crypt", GF_LOG_WARNING, "Bad wb operation %d", fop);
+		return NULL;
+	}
+}
+
+/*
+ * true, if the caller needs metadata string
+ */
+static int32_t is_custom_mtd(dict_t *xdata)
+{
+	data_t *data;
+	uint32_t flags;
+
+	if (!xdata)
+		return 0;
+
+	data = dict_get(xdata, MSGFLAGS_PREFIX);
+	if (!data)
+		return 0;
+	if (data->len != sizeof(uint32_t)) {
+		gf_log("crypt", GF_LOG_WARNING,
+		       "Bad msgflags size (%d)", data->len);
+		return -1;
+	}
+	flags = *((uint32_t *)data->data);
+	return msgflags_check_mtd_lock(&flags);
+}
+
+static int32_t crypt_open_done(call_frame_t *frame,
+			       void *cookie,
+			       xlator_t *this,
+			       int32_t op_ret,
+			       int32_t op_errno, dict_t *xdata)
+{
+	crypt_local_t *local = frame->local;
+
+	local->op_ret = op_ret;
+	local->op_errno = op_errno;
+	if (op_ret < 0)
+		gf_log(this->name, GF_LOG_WARNING, "mtd unlock failed (%d)",
+		       op_errno);
+	put_one_call_open(frame);
+	return 0;
+}
+
+static void crypt_open_tail(call_frame_t *frame, xlator_t *this)
+{
+	struct gf_flock  lock  = {0, };
+	crypt_local_t *local = frame->local;
+
+        lock.l_type   = F_UNLCK;
+        lock.l_whence = SEEK_SET;
+        lock.l_start  = 0;
+        lock.l_len    = 0;
+        lock.l_pid    = 0;
+
+	STACK_WIND(frame,
+		   crypt_open_done,
+		   FIRST_CHILD(this),
+		   FIRST_CHILD(this)->fops->finodelk,
+		   this->name,
+		   local->fd,
+		   F_SETLKW,
+		   &lock,
+		   NULL);
+}
+
+/*
+ * load private inode info at open time
+ * called as ->fgetxattr_cbk()
+ */
+static int load_mtd_open(call_frame_t *frame,
+			 void *cookie,
+			 xlator_t *this,
+			 int32_t op_ret,
+			 int32_t op_errno,
+			 dict_t *dict,
+			 dict_t *xdata)
+{
+	int32_t ret;
+	gf_boolean_t upload_info;
+	data_t *mtd;
+	uint64_t value = 0;
+	struct crypt_inode_info *info;
+	crypt_local_t *local = frame->local;
+	crypt_private_t *priv = this->private;
+
+	local->op_ret = op_ret;
+	local->op_errno = op_errno;
+
+	if (local->fd->inode->ia_type == IA_IFLNK)
+		goto exit;
+	if (op_ret < 0)
+		goto exit;
+	/*
+	 * first, check for cached info
+	 */
+	ret = inode_ctx_get(local->fd->inode, this, &value);
+	if (ret != -1) {
+		info = (struct crypt_inode_info *)(long)value;
+		if (info == NULL) {
+			gf_log(this->name, GF_LOG_WARNING,
+			       "Inode info expected, but not found");
+			local->op_ret = -1;
+			local->op_errno = EIO;
+			goto exit;
+		}
+		/*
+		 * info has been found in the cache
+		 */
+		upload_info = _gf_false;
+	}
+	else {
+		/*
+		 * info hasn't been found in the cache.
+		 */
+		info = alloc_inode_info(local, local->loc);
+		if (!info) {
+			local->op_ret = -1;
+			local->op_errno = ENOMEM;
+			goto exit;
+		}
+		init_inode_info_head(info, local->fd);
+		upload_info = _gf_true;
+	}
+	/*
+	 * extract metadata
+	 */
+	mtd = dict_get(dict, CRYPTO_FORMAT_PREFIX);
+	if (!mtd) {
+		local->op_ret = -1;
+		local->op_errno = ENOENT;
+		gf_log (this->name, GF_LOG_WARNING,
+			"Format string wasn't found");
+		goto exit;
+	}
+	/*
+	 * authenticate metadata against the path
+	 */	
+	ret = open_format((unsigned char *)mtd->data,
+			  mtd->len,
+			  local->loc,
+			  info,
+			  get_master_cinfo(priv),
+			  local,
+			  upload_info);
+	if (ret) {
+		local->op_ret = -1;
+		local->op_errno = ret;
+		goto exit;
+	}
+	if (upload_info) {
+		ret = init_inode_info_tail(info, get_master_cinfo(priv));
+		if (ret) {
+			local->op_ret = -1;
+			local->op_errno = ret;
+			goto exit;	
+		}
+		ret = inode_ctx_put(local->fd->inode,
+				    this, (uint64_t)(long)info);
+		if (ret == -1) {
+			local->op_ret = -1;
+			local->op_errno = EIO;
+			goto exit;
+		}
+	}
+	if (local->custom_mtd) {
+		/*
+		 * pass the metadata string to the customer
+		 */
+		ret = dict_set_static_bin(local->xdata,
+					  CRYPTO_FORMAT_PREFIX,
+					  mtd->data,
+					  mtd->len);
+		if (ret) {
+			local->op_ret = -1;
+			local->op_errno = ret;
+			goto exit;
+		}
+	}
+ exit:
+	if (!local->custom_mtd)
+		crypt_open_tail(frame, this);
+	else
+		put_one_call_open(frame);
+	return 0;
+}
+
+static int32_t crypt_open_finodelk_cbk(call_frame_t *frame,
+				       void *cookie,
+				       xlator_t *this,
+				       int32_t op_ret,
+				       int32_t op_errno,
+				       dict_t *xdata)
+{
+	crypt_local_t *local = frame->local;
+
+	local->op_ret = op_ret;
+	local->op_errno = op_errno;
+
+	if (op_ret < 0) {
+		gf_log(this->name, GF_LOG_WARNING, "finodelk (LOCK) failed");
+		goto exit;
+	}
+	STACK_WIND(frame,
+		   load_mtd_open,
+		   FIRST_CHILD(this),
+		   FIRST_CHILD(this)->fops->fgetxattr,
+		   local->fd,
+		   CRYPTO_FORMAT_PREFIX,
+		   NULL);
+	return 0;
+ exit:
+	put_one_call_open(frame);
+	return 0;
+}
+
+/*
+ * verify metadata against the specified pathname
+ */
+static int32_t crypt_open_cbk(call_frame_t *frame,
+			      void *cookie,
+			      xlator_t *this,
+			      int32_t op_ret,
+			      int32_t op_errno,
+			      fd_t *fd,
+			      dict_t *xdata)
+{
+	struct gf_flock lock = {0, };
+	crypt_local_t *local = frame->local;
+
+	local->op_ret = op_ret;
+	local->op_errno = op_errno;
+
+	if (local->fd->inode->ia_type == IA_IFLNK)
+		goto exit;
+	if (op_ret < 0)
+		goto exit;
+	if (xdata)
+		local->xdata = dict_ref(xdata);
+	else if (local->custom_mtd){
+		local->xdata = dict_new();
+		if (!local->xdata) {
+			local->op_ret = -1;
+			local->op_errno = ENOMEM;
+			gf_log ("crypt", GF_LOG_ERROR,
+				"Can not get new dict for mtd string");
+			goto exit;
+		}
+	}
+	lock.l_len    = 0;
+        lock.l_start  = 0;
+        lock.l_type   = local->custom_mtd ? F_WRLCK : F_RDLCK;
+        lock.l_whence = SEEK_SET;
+
+	STACK_WIND(frame,
+		   crypt_open_finodelk_cbk,
+		   FIRST_CHILD(this),
+		   FIRST_CHILD(this)->fops->finodelk,
+		   this->name,
+		   fd,
+		   F_SETLKW,
+		   &lock,
+		   NULL);
+	return 0;
+ exit:
+	put_one_call_open(frame);
+	return 0;
+}
+
+static int32_t crypt_open(call_frame_t *frame,
+			  xlator_t *this,
+			  loc_t *loc,
+			  int32_t flags,
+			  fd_t *fd,
+			  dict_t *xdata)
+{
+	int32_t ret = ENOMEM;
+	crypt_local_t *local;
+
+	local = crypt_alloc_local(frame, this, GF_FOP_OPEN);
+	if (!local)
+		goto error;
+	local->loc = GF_CALLOC(1, sizeof(*loc), gf_crypt_mt_loc);
+	if (!local->loc) {
+		ret = ENOMEM;
+		goto error;
+	}
+	memset(local->loc, 0, sizeof(*local->loc));
+	ret = loc_copy(local->loc, loc);
+	if (ret) {
+		GF_FREE(local->loc);
+		goto error;
+	}
+	local->fd = fd_ref(fd);
+
+	ret = is_custom_mtd(xdata);
+	if (ret < 0) {
+		loc_wipe(local->loc);
+		GF_FREE(local->loc);
+		ret = EINVAL;
+		goto error;
+	}
+	local->custom_mtd = ret;
+
+	if ((flags & O_ACCMODE) == O_WRONLY)
+		/*
+		 * we can't open O_WRONLY, because
+		 * we need to do read-modify-write
+		 */
+		flags = (flags & ~O_ACCMODE) | O_RDWR;
+	/*
+	 * Make sure that out translated offsets
+	 * and counts won't be ignored
+	 */
+	flags &= ~O_APPEND;
+	get_one_call_nolock(frame);
+	STACK_WIND(frame,
+		   crypt_open_cbk,
+		   FIRST_CHILD(this),
+		   FIRST_CHILD(this)->fops->open,
+		   loc,
+		   flags,
+		   fd,
+		   xdata);
+	return 0;
+ error:
+	STACK_UNWIND_STRICT(open,
+			    frame,
+			    -1,
+			    ret,
+			    NULL,
+			    NULL);
+	return 0;
+}
+
+static int32_t init_inode_info_tail(struct crypt_inode_info *info,
+				    struct master_cipher_info *master)
+{
+	int32_t ret;
+	struct object_cipher_info *object = &info->cinfo;
+
+#if DEBUG_CRYPT
+	gf_log("crypt", GF_LOG_DEBUG, "Init inode info for object %s",
+	       uuid_utoa(info->oid));
+#endif
+	ret = data_cipher_algs[object->o_alg][object->o_mode].set_private(info,
+									master);
+	if (ret) {
+		gf_log("crypt", GF_LOG_ERROR, "Set private info failed");
+		return ret;
+	}
+	return 0;
+}
+
+/*
+ * Init inode info at ->create() time
+ */
+static void init_inode_info_create(struct crypt_inode_info *info,
+				   struct master_cipher_info *master,
+				   data_t *data)
+{
+	struct object_cipher_info *object;
+
+	info->nr_minor = CRYPT_XLATOR_ID;
+	memcpy(info->oid, data->data, data->len);
+
+	object = &info->cinfo;
+
+	object->o_alg        = master->m_alg;
+	object->o_mode       = master->m_mode;
+	object->o_block_bits = master->m_block_bits;
+	object->o_dkey_size  = master->m_dkey_size;
+}
+
+static void init_inode_info_head(struct crypt_inode_info *info, fd_t *fd)
+{
+	memcpy(info->oid, fd->inode->gfid, sizeof(uuid_t));
+}
+
+static int32_t crypt_create_done(call_frame_t *frame,
+				 void *cookie,
+				 xlator_t *this,
+				 int32_t op_ret,
+				 int32_t op_errno, dict_t *xdata)
+{
+	crypt_private_t *priv = this->private;
+	crypt_local_t *local = frame->local;
+	struct crypt_inode_info *info = local->info;
+	fd_t *local_fd = local->fd;
+	dict_t *local_xdata = local->xdata;
+	inode_t *local_inode = local->inode;
+
+	if (op_ret < 0) {
+		free_inode_info(info);
+		goto unwind;
+	}
+	op_errno = init_inode_info_tail(info, get_master_cinfo(priv));
+	if (op_errno) {
+		op_ret = -1;
+		free_inode_info(info);
+		goto unwind;
+	}
+	/*
+	 * FIXME: drop major subversion number
+	 */
+	op_ret = inode_ctx_put(local->fd->inode, this, (uint64_t)(long)info);
+	if (op_ret == -1) {
+		op_errno = EIO;
+		free_inode_info(info);
+		goto unwind;
+	}
+ unwind:
+	free_format(local);
+	STACK_UNWIND_STRICT(create,
+			    frame,
+			    op_ret,
+			    op_errno,
+			    local_fd,
+			    local_inode,
+			    &local->buf,
+			    &local->prebuf,
+			    &local->postbuf,
+			    local_xdata);
+	fd_unref(local_fd);
+	inode_unref(local_inode);
+	if (local_xdata)
+		dict_unref(local_xdata);
+	return 0;
+}
+
+static int crypt_create_tail(call_frame_t *frame,
+			     void *cookie,
+			     xlator_t *this,
+			     int32_t op_ret,
+			     int32_t op_errno,
+			     dict_t *xdata)
+{
+	struct gf_flock  lock  = {0, };
+	crypt_local_t *local = frame->local;
+	fd_t *local_fd = local->fd;
+	dict_t *local_xdata = local->xdata;
+	inode_t *local_inode = local->inode;
+
+	dict_unref(local->xattr);
+
+	if (op_ret < 0)
+		goto error;
+
+        lock.l_type   = F_UNLCK;
+        lock.l_whence = SEEK_SET;
+        lock.l_start  = 0;
+        lock.l_len    = 0;
+        lock.l_pid    = 0;
+
+	STACK_WIND(frame,
+		   crypt_create_done,
+		   FIRST_CHILD(this),
+		   FIRST_CHILD(this)->fops->finodelk,
+		   this->name,
+		   local->fd,
+		   F_SETLKW,
+		   &lock,
+		   NULL);
+	return 0;
+ error:
+	free_inode_info(local->info);
+	free_format(local);
+
+	STACK_UNWIND_STRICT(create,
+			    frame,
+			    op_ret,
+			    op_errno,
+			    local_fd,
+			    local_inode,
+			    &local->buf,
+			    &local->prebuf,
+			    &local->postbuf,
+			    local_xdata);
+
+	fd_unref(local_fd);
+	inode_unref(local_inode);
+	if (local_xdata)
+		dict_unref(local_xdata);
+	return 0;
+}
+
+static int32_t crypt_create_finodelk_cbk(call_frame_t *frame,
+					 void *cookie,
+					 xlator_t *this,
+					 int32_t op_ret,
+					 int32_t op_errno,
+					 dict_t *xdata)
+{
+	crypt_local_t *local = frame->local;
+	struct crypt_inode_info *info = local->info;
+
+	if (op_ret < 0)
+		goto error;
+
+	STACK_WIND(frame,
+		   crypt_create_tail,
+		   FIRST_CHILD(this),
+		   FIRST_CHILD(this)->fops->fsetxattr,
+		   local->fd,
+		   local->xattr, /* CRYPTO_FORMAT_PREFIX */
+		   0,
+		   NULL);
+	return 0;
+ error: 
+	free_inode_info(info);
+	free_format(local);
+	fd_unref(local->fd);
+	dict_unref(local->xattr);
+	if (local->xdata)
+		dict_unref(local->xdata);
+
+	STACK_UNWIND_STRICT(create,
+			    frame,
+			    op_ret,
+			    op_errno,
+			    NULL,
+			    NULL,
+			    NULL,
+			    NULL,
+			    NULL,
+			    NULL);
+	return 0;
+}
+
+/*
+ * Create and store crypt-specific format on disk;
+ * Populate cache with private inode info
+ */
+static int32_t crypt_create_cbk(call_frame_t *frame,
+				void *cookie,
+				xlator_t *this,
+				int32_t op_ret,
+				int32_t op_errno,
+				fd_t *fd,
+				inode_t *inode,
+				struct iatt *buf,
+				struct iatt *preparent,
+				struct iatt *postparent,
+				dict_t *xdata)
+{
+	struct gf_flock lock = {0, };
+	crypt_local_t *local = frame->local;
+	struct crypt_inode_info *info = local->info;
+
+	if (op_ret < 0)
+		goto error;
+	if (xdata)
+		local->xdata = dict_ref(xdata);	
+	local->inode = inode_ref(inode);
+	local->buf = *buf;
+	local->prebuf = *preparent;
+	local->postbuf = *postparent;
+
+        lock.l_len    = 0;
+        lock.l_start  = 0;
+        lock.l_type   = F_WRLCK;
+        lock.l_whence = SEEK_SET;
+
+        STACK_WIND(frame,
+		   crypt_create_finodelk_cbk,
+		   FIRST_CHILD(this),
+		   FIRST_CHILD(this)->fops->finodelk,
+		   this->name,
+		   local->fd,
+		   F_SETLKW,
+		   &lock,
+		   NULL);	
+	return 0;
+ error:
+	free_inode_info(info);
+	free_format(local);
+	fd_unref(local->fd);
+	dict_unref(local->xattr);
+
+	STACK_UNWIND_STRICT(create,
+			    frame,
+			    op_ret,
+			    op_errno,
+			    NULL, NULL, NULL,
+			    NULL, NULL, NULL);
+	return 0;
+}
+
+static int32_t crypt_create(call_frame_t *frame,
+			    xlator_t *this,
+			    loc_t *loc,
+			    int32_t flags,
+			    mode_t mode,
+			    mode_t umask,
+			    fd_t *fd,
+			    dict_t *xdata)
+{
+	int ret;
+	data_t *data;
+	crypt_local_t *local;
+	crypt_private_t *priv;
+	struct master_cipher_info *master;
+	struct crypt_inode_info *info;
+
+	priv = this->private;
+	master = get_master_cinfo(priv);
+
+	if (master_alg_atomic(master)) {
+		/*
+		 * We can't open O_WRONLY, because we
+		 * need to do read-modify-write.
+		 */
+		if ((flags & O_ACCMODE) == O_WRONLY)
+			flags = (flags & ~O_ACCMODE) | O_RDWR;
+		/*
+		 * Make sure that out translated offsets
+		 * and counts won't be ignored
+		 */
+		flags &= ~O_APPEND;
+	}
+	local = crypt_alloc_local(frame, this, GF_FOP_CREATE);
+	if (!local) {
+		ret = ENOMEM;
+		goto error;
+	}
+	data = dict_get(xdata, "gfid-req");
+	if (!data) {
+		ret = EINVAL;
+		gf_log("crypt", GF_LOG_WARNING, "gfid not found");
+		goto error;
+	}
+	if (data->len != sizeof(uuid_t)) {
+		ret = EINVAL;
+		gf_log("crypt", GF_LOG_WARNING,
+		       "bad gfid size (%d), should be %d",
+		       (int)data->len, (int)sizeof(uuid_t));
+		goto error;
+	}
+	info = alloc_inode_info(local, loc);
+	if (!info){
+		ret = ENOMEM;
+		goto error;
+	}
+	/*
+	 * NOTE:
+	 * format has to be created BEFORE
+	 * proceeding to the untrusted server
+	 */
+	ret = alloc_format_create(local);
+	if (ret) {
+		free_inode_info(info);
+		goto error;
+	}
+	init_inode_info_create(info, master, data);
+
+	ret = create_format(local->format,
+			    loc,
+			    info,
+			    master);
+	if (ret) {
+		free_inode_info(info);
+		goto error;		
+	}
+	local->xattr = dict_new();
+	if (!local->xattr) {
+		free_inode_info(info);
+		free_format(local);	
+		goto error;
+	}
+	ret = dict_set_static_bin(local->xattr,
+				  CRYPTO_FORMAT_PREFIX,
+				  local->format,
+				  new_format_size());
+	if (ret) {
+		dict_unref(local->xattr);
+		free_inode_info(info);
+		free_format(local);
+		goto error;
+	}
+	ret = dict_set(local->xattr, FSIZE_XATTR_PREFIX, data_from_uint64(0));
+	if (ret) {
+		dict_unref(local->xattr);
+		free_inode_info(info);
+		free_format(local);
+		goto error;
+	}
+	local->fd = fd_ref(fd);
+
+	STACK_WIND(frame,
+		   crypt_create_cbk,
+		   FIRST_CHILD(this),
+		   FIRST_CHILD(this)->fops->create,
+		   loc,
+		   flags,
+		   mode,
+		   umask,
+		   fd,
+		   xdata);
+	return 0;
+ error:
+	gf_log("crypt", GF_LOG_WARNING, "can not create file");
+	STACK_UNWIND_STRICT(create,
+			    frame,
+			    -1,
+			    ret,
+			    NULL, NULL, NULL,
+			    NULL, NULL, NULL);
+	return 0;
+}
+
+/*
+ * FIXME: this should depends on the version of format string
+ */
+static int32_t filter_crypt_xattr(dict_t *dict,
+				  char *key, data_t *value, void *data)
+{
+        dict_del(dict, key);
+        return 0;
+}
+
+static int32_t crypt_fsetxattr(call_frame_t *frame,
+			       xlator_t *this,
+			       fd_t *fd,
+			       dict_t *dict,
+			       int32_t flags, dict_t *xdata)
+{
+	dict_foreach_fnmatch(dict, "trusted.glusterfs.crypt*",
+			     filter_crypt_xattr, NULL);
+	STACK_WIND(frame,
+		   default_fsetxattr_cbk,
+		   FIRST_CHILD(this),
+		   FIRST_CHILD(this)->fops->fsetxattr,
+		   fd,
+		   dict,
+		   flags,
+		   xdata);
+	return 0;
+}
+
+/*
+ * TBD: verify file metadata before wind
+ */
+static int32_t crypt_setxattr(call_frame_t *frame,
+			      xlator_t *this,
+			      loc_t *loc,
+			      dict_t *dict,
+			      int32_t flags, dict_t *xdata)
+{
+	dict_foreach_fnmatch(dict, "trusted.glusterfs.crypt*",
+			     filter_crypt_xattr, NULL);
+	STACK_WIND(frame,
+		   default_setxattr_cbk,
+		   FIRST_CHILD(this),
+		   FIRST_CHILD(this)->fops->setxattr,
+		   loc,
+		   dict,
+		   flags,
+		   xdata);
+	return 0;
+}
+
+/*
+ * called as flush_cbk()
+ */
+static int32_t linkop_end(call_frame_t *frame,
+			  void *cookie,
+			  xlator_t *this,
+			  int32_t op_ret,
+			  int32_t op_errno,
+			  dict_t *xdata)
+{
+	crypt_local_t *local = frame->local;
+	linkop_unwind_handler_t unwind_fn;
+	unwind_fn = linkop_unwind_dispatch(local->fop);
+
+	local->op_ret = op_ret;
+	local->op_errno = op_errno;
+
+	if (op_ret < 0 &&
+	    op_errno == ENOENT &&
+	    local->loc->inode->ia_type == IA_IFLNK) {
+		local->op_ret = 0;
+		local->op_errno = 0;
+	}
+	unwind_fn(frame);
+	return 0;
+}
+
+/*
+ * unpin inode on the server
+ */
+static int32_t link_flush(call_frame_t *frame,
+			  void *cookie,
+			  xlator_t *this,
+			  int32_t op_ret,
+			  int32_t op_errno,
+			  inode_t *inode,
+			  struct iatt *buf,
+			  struct iatt *preparent,
+			  struct iatt *postparent, dict_t *xdata)
+{
+	crypt_local_t *local = frame->local;
+
+	if (op_ret < 0)
+		goto error;
+	if (local->xdata) {
+		dict_unref(local->xdata);
+		local->xdata = NULL;
+	}
+	if (xdata)
+		local->xdata = dict_ref(xdata);
+	local->inode = inode_ref(inode);
+	local->buf = *buf;
+	local->prebuf = *preparent;
+	local->postbuf = *postparent;
+
+	STACK_WIND(frame,
+		   linkop_end,
+		   FIRST_CHILD(this),
+		   FIRST_CHILD(this)->fops->flush,
+		   local->fd,
+		   NULL);
+	return 0;
+ error:
+	local->op_ret = -1;
+	local->op_errno = op_errno;
+	link_unwind(frame);
+	return 0;
+}
+
+void link_unwind(call_frame_t *frame)
+{
+	crypt_local_t *local = frame->local;
+	dict_t *xdata;
+	dict_t *xattr;
+	inode_t *inode;
+
+	if (!local) {
+		STACK_UNWIND_STRICT(link,
+				    frame,
+				    -1,
+				    ENOMEM,
+				    NULL,
+				    NULL,
+				    NULL,
+				    NULL,
+				    NULL);
+		return;
+	}
+	xdata = local->xdata;
+	xattr = local->xattr;
+	inode = local->inode;
+
+	if (local->loc){
+		loc_wipe(local->loc);
+		GF_FREE(local->loc);
+	}
+	if (local->newloc) {
+		loc_wipe(local->newloc);
+		GF_FREE(local->newloc);
+	}
+	if (local->fd)
+		fd_unref(local->fd);
+	if (local->format)
+		GF_FREE(local->format);
+
+	STACK_UNWIND_STRICT(link,
+			    frame,
+			    local->op_ret,
+			    local->op_errno,
+			    inode,
+			    &local->buf,
+			    &local->prebuf,
+			    &local->postbuf,
+			    xdata);
+	if (xdata)
+		dict_unref(xdata);
+	if (xattr)
+		dict_unref(xattr);
+	if (inode)
+		inode_unref(inode);
+}
+
+void link_wind(call_frame_t *frame, xlator_t *this)
+{
+	crypt_local_t *local = frame->local;
+
+	STACK_WIND(frame,
+		   link_flush,
+		   FIRST_CHILD(this),
+		   FIRST_CHILD(this)->fops->link,
+		   local->loc,
+		   local->newloc,
+		   local->xdata);
+}
+
+/*
+ * unlink()
+ */
+static int32_t unlink_flush(call_frame_t *frame,
+			    void *cookie,
+			    xlator_t *this,
+			    int32_t op_ret,
+			    int32_t op_errno,
+			    struct iatt *preparent,
+			    struct iatt *postparent, dict_t *xdata)
+{
+	crypt_local_t *local = frame->local;
+
+	if (op_ret < 0)
+		goto error;
+	local->prebuf = *preparent;
+	local->postbuf = *postparent;
+	if (local->xdata) {
+		dict_unref(local->xdata);
+		local->xdata = NULL;
+	}
+	if (xdata)
+		local->xdata = dict_ref(xdata);
+
+	STACK_WIND(frame,
+		   linkop_end,
+		   FIRST_CHILD(this),
+		   FIRST_CHILD(this)->fops->flush,
+		   local->fd,
+		   NULL);
+	return 0;
+ error:
+	local->op_ret = -1;
+	local->op_errno = op_errno;
+	unlink_unwind(frame);
+	return 0;
+}
+
+void unlink_unwind(call_frame_t *frame)
+{
+	crypt_local_t *local = frame->local;
+	dict_t *xdata;
+	dict_t *xattr;
+
+	if (!local) {
+		STACK_UNWIND_STRICT(unlink,
+				    frame,
+				    -1,
+				    ENOMEM,
+				    NULL,
+				    NULL,
+				    NULL);
+		return;
+	}
+	xdata = local->xdata;
+	xattr = local->xattr;
+	if (local->loc){
+		loc_wipe(local->loc);
+		GF_FREE(local->loc);
+	}
+	if (local->fd)
+		fd_unref(local->fd);
+	if (local->format)
+		GF_FREE(local->format);
+
+	STACK_UNWIND_STRICT(unlink,
+			    frame,
+			    local->op_ret,
+			    local->op_errno,
+			    &local->prebuf,
+			    &local->postbuf,
+			    xdata);
+	if (xdata)
+		dict_unref(xdata);
+	if (xattr)
+		dict_unref(xattr);
+}
+
+void unlink_wind(call_frame_t *frame, xlator_t *this)
+{
+	crypt_local_t *local = frame->local;
+
+	STACK_WIND(frame,
+		   unlink_flush,
+		   FIRST_CHILD(this),
+		   FIRST_CHILD(this)->fops->unlink,
+		   local->loc,
+		   local->flags,
+		   local->xdata);
+}
+
+void rename_unwind(call_frame_t *frame)
+{
+	crypt_local_t *local = frame->local;
+	dict_t *xdata;
+	dict_t *xattr;
+	struct iatt *prenewparent;
+	struct iatt *postnewparent;
+
+	if (!local) {
+		STACK_UNWIND_STRICT(rename,
+				    frame,
+				    -1,
+				    ENOMEM,
+				    NULL,
+				    NULL,
+				    NULL,
+				    NULL,
+				    NULL,
+				    NULL);	
+		return;
+	}
+	xdata = local->xdata;
+	xattr = local->xattr;
+	prenewparent = local->prenewparent;
+	postnewparent = local->postnewparent;	
+
+	if (local->loc){
+		loc_wipe(local->loc);
+		GF_FREE(local->loc);
+	}
+	if (local->newloc){
+		loc_wipe(local->newloc);
+		GF_FREE(local->newloc);
+	}
+	if (local->fd)
+		fd_unref(local->fd);
+	if (local->format)
+		GF_FREE(local->format);
+
+	STACK_UNWIND_STRICT(rename,
+			    frame,
+			    local->op_ret,
+			    local->op_errno,
+			    &local->buf,
+			    &local->prebuf,
+			    &local->postbuf,
+			    prenewparent,
+			    postnewparent,
+			    xdata);
+	if (xdata)
+		dict_unref(xdata);
+	if (xattr)
+		dict_unref(xattr);
+	if (prenewparent)
+		GF_FREE(prenewparent);
+	if (postnewparent)
+		GF_FREE(postnewparent);
+}
+
+/*
+ * called as flush_cbk()
+ */
+static int32_t rename_end(call_frame_t *frame,
+			  void *cookie,
+			  xlator_t *this,
+			  int32_t op_ret,
+			  int32_t op_errno,
+			  dict_t *xdata)
+{
+	crypt_local_t *local = frame->local;
+
+	local->op_ret = op_ret;
+	local->op_errno = op_errno;
+
+	rename_unwind(frame);
+	return 0;
+}
+
+static int32_t rename_flush(call_frame_t *frame,
+			    void *cookie,
+			    xlator_t *this,
+			    int32_t op_ret,
+			    int32_t op_errno,
+			    struct iatt *buf,
+			    struct iatt *preoldparent,
+			    struct iatt *postoldparent,
+			    struct iatt *prenewparent,
+			    struct iatt *postnewparent,
+			    dict_t *xdata)
+{
+	crypt_local_t *local = frame->local;
+
+	if (op_ret < 0)
+		goto error;
+	dict_unref(local->xdata);
+	local->xdata = NULL;
+	if (xdata)
+		local->xdata = dict_ref(xdata);
+
+	local->buf = *buf;
+	local->prebuf = *preoldparent;
+	local->postbuf = *postoldparent;
+	if (prenewparent) {
+		local->prenewparent = GF_CALLOC(1, sizeof(*prenewparent),
+						gf_crypt_mt_iatt);
+		if (!local->prenewparent) {
+			op_errno = ENOMEM;
+			goto error;
+		}
+		*local->prenewparent = *prenewparent;
+	}
+	if (postnewparent) {
+		local->postnewparent = GF_CALLOC(1, sizeof(*postnewparent),
+						 gf_crypt_mt_iatt);
+		if (!local->postnewparent) {
+			op_errno = ENOMEM;
+			goto error;
+		}
+		*local->postnewparent = *postnewparent;
+	}
+	STACK_WIND(frame,
+		   rename_end,
+		   FIRST_CHILD(this),
+		   FIRST_CHILD(this)->fops->flush,
+		   local->fd,
+		   NULL);
+	return 0;
+ error:
+	local->op_ret = -1;
+	local->op_errno = op_errno;
+	rename_unwind(frame);
+	return 0;
+}
+
+void rename_wind(call_frame_t *frame, xlator_t *this)
+{
+	crypt_local_t *local = frame->local;
+
+	STACK_WIND(frame,
+		   rename_flush,
+		   FIRST_CHILD(this),
+		   FIRST_CHILD(this)->fops->rename,
+		   local->loc,
+		   local->newloc,
+		   local->xdata);
+}
+
+static int32_t __do_linkop(call_frame_t *frame,
+			   void *cookie,
+			   xlator_t *this,
+			   int32_t op_ret,
+			   int32_t op_errno, dict_t *xdata)
+{
+	crypt_local_t *local = frame->local;
+	linkop_wind_handler_t wind_fn;
+	linkop_unwind_handler_t unwind_fn;
+
+	wind_fn = linkop_wind_dispatch(local->fop);
+	unwind_fn = linkop_unwind_dispatch(local->fop);
+
+	local->op_ret = op_ret;
+	local->op_errno = op_errno;
+
+	if (op_ret >= 0)
+		wind_fn(frame, this);
+	else {
+		gf_log(this->name, GF_LOG_WARNING, "mtd unlock failed (%d)",
+		       op_errno);
+		unwind_fn(frame);
+	}
+	return 0;
+}
+
+static int32_t do_linkop(call_frame_t *frame,
+			 void *cookie,
+			 xlator_t *this,
+			 int32_t op_ret,
+			 int32_t op_errno,
+			 dict_t *xdata)
+{
+	struct gf_flock  lock  = {0, };
+	crypt_local_t *local = frame->local;
+	linkop_unwind_handler_t unwind_fn;
+
+	unwind_fn = linkop_unwind_dispatch(local->fop);
+	local->op_ret = op_ret;
+	local->op_errno = op_errno;
+
+	if(op_ret < 0)
+		goto error;
+
+	lock.l_type   = F_UNLCK;
+        lock.l_whence = SEEK_SET;
+        lock.l_start  = 0;
+        lock.l_len    = 0;
+        lock.l_pid    = 0;
+
+	STACK_WIND(frame,
+		   __do_linkop,
+		   FIRST_CHILD(this),
+		   FIRST_CHILD(this)->fops->finodelk,
+		   this->name,
+		   local->fd,
+		   F_SETLKW,
+		   &lock,
+		   NULL);
+	return 0;
+ error:		
+	unwind_fn(frame);
+	return 0;
+}
+
+/*
+ * Update the metadata string (against the new pathname);
+ * submit the result
+ */
+static int32_t linkop_begin(call_frame_t *frame,
+			    void *cookie,
+			    xlator_t *this,
+			    int32_t op_ret,
+			    int32_t op_errno,
+			    fd_t *fd,
+			    dict_t *xdata)
+{
+	gf_boolean_t upload_info;
+	crypt_local_t *local = frame->local;
+	crypt_private_t *priv = this->private;
+	struct crypt_inode_info *info;
+	data_t *old_mtd;
+	uint32_t new_mtd_size;
+	uint64_t value = 0;
+	void (*unwind_fn)(call_frame_t *frame);
+	void (*wind_fn)(call_frame_t *frame, xlator_t *this);
+	mtd_op_t mop;
+
+	wind_fn = linkop_wind_dispatch(local->fop);
+	unwind_fn = linkop_unwind_dispatch(local->fop);
+	mop = linkop_mtdop_dispatch(local->fop);
+
+	if (local->fd->inode->ia_type == IA_IFLNK)
+		goto wind;
+	if (op_ret < 0)
+		/*
+		 * verification failed
+		 */
+		goto error;
+
+	old_mtd = dict_get(xdata, CRYPTO_FORMAT_PREFIX);
+	if (!old_mtd) {
+		op_errno = EIO;
+		gf_log (this->name, GF_LOG_DEBUG,
+			"Metadata string wasn't found");
+		goto error;
+	}
+	new_mtd_size = format_size(mop, old_mtd->len);
+	op_errno = alloc_format(local, new_mtd_size);
+	if (op_errno)
+		goto error;
+	/*
+	 * check for cached info 
+	 */
+	op_ret = inode_ctx_get(fd->inode, this, &value);
+	if (op_ret != -1) {
+		info = (struct crypt_inode_info *)(long)value;
+		if (info == NULL) {
+			gf_log (this->name, GF_LOG_WARNING,
+				"Inode info was not found");
+			op_errno = EINVAL;
+			goto error;
+		}
+		/*
+		 * info was found in the cache
+		 */
+		local->info = info;
+		upload_info = _gf_false;
+	}
+	else {
+		/*
+		 * info wasn't found in the cache;
+		 */
+		info = alloc_inode_info(local, local->loc);
+		if (!info)
+			goto error;
+		init_inode_info_head(info, fd);
+		local->info = info;
+		upload_info = _gf_true;
+	}
+	op_errno = open_format((unsigned char *)old_mtd->data,
+			       old_mtd->len,
+			       local->loc,
+			       info,
+			       get_master_cinfo(priv),
+			       local,
+			       upload_info);
+	if (op_errno)
+		goto error;
+	if (upload_info == _gf_true) {
+		op_errno = init_inode_info_tail(info,
+						get_master_cinfo(priv));
+		if (op_errno)
+			goto error;
+		op_errno = inode_ctx_put(fd->inode, this,
+					 (uint64_t)(long)(info));
+		if (op_errno == -1) {
+			op_errno = EIO;
+			goto error;
+		}
+	}
+	/*
+	 * update the format string (append/update/cup a MAC)
+	 */
+	op_errno = update_format(local->format,
+				 (unsigned char *)old_mtd->data,
+				 old_mtd->len,
+				 local->mac_idx,
+				 mop,
+				 local->newloc,
+				 info,
+				 get_master_cinfo(priv),
+				 local);
+	if (op_errno)
+		goto error;
+	/*
+	 * store the new format string on the server
+	 */
+	if (new_mtd_size) {
+		op_errno = dict_set_static_bin(local->xattr,
+					       CRYPTO_FORMAT_PREFIX,
+					       local->format,
+					       new_mtd_size);
+		if (op_errno)
+			goto error;
+	}
+	STACK_WIND(frame,
+		   do_linkop,
+		   FIRST_CHILD(this),
+		   FIRST_CHILD(this)->fops->setxattr,
+		   local->loc,
+		   local->xattr,
+		   0,
+		   NULL);
+	return 0;
+ wind:
+	wind_fn(frame, this);
+	return 0;
+ error:
+	local->op_ret = -1;
+	local->op_errno = op_errno;
+	unwind_fn(frame);
+	return 0;
+}
+
+static int32_t linkop_grab_local(call_frame_t *frame,
+				 xlator_t *this,
+				 loc_t *oldloc,
+				 loc_t *newloc,
+				 int flags, dict_t *xdata,
+				 glusterfs_fop_t op)
+{
+	int32_t ret = ENOMEM;
+	fd_t *fd;
+	crypt_local_t *local;
+
+	local = crypt_alloc_local(frame, this, op);
+	if (!local)
+		goto error;
+	if (xdata)
+		local->xdata = dict_ref(xdata);
+
+	fd = fd_create(oldloc->inode, frame->root->pid);
+	if (!fd) {
+		gf_log(this->name, GF_LOG_ERROR, "Can not create fd");
+		goto error;
+	}
+	local->fd = fd;
+	local->flags = flags;
+	local->loc = GF_CALLOC(1, sizeof(*oldloc), gf_crypt_mt_loc);
+	if (!local->loc)
+		goto error;
+	memset(local->loc, 0, sizeof(*local->loc));
+	ret = loc_copy(local->loc, oldloc);
+	if (ret) {
+		GF_FREE(local->loc);
+		local->loc = NULL;
+		goto error;
+	}
+	if (newloc) {
+		local->newloc = GF_CALLOC(1, sizeof(*newloc), gf_crypt_mt_loc);
+		if (!local->newloc) {
+			GF_FREE(local->loc);
+			loc_wipe(local->loc);
+			goto error;
+		}
+		memset(local->newloc, 0, sizeof(*local->newloc));
+		ret = loc_copy(local->newloc, newloc);
+		if (ret) {
+			GF_FREE(local->loc);
+			loc_wipe(local->loc);
+			GF_FREE(local->newloc);
+			goto error;
+		}
+	}
+	local->xattr = dict_new();
+	if (!local->xattr) {
+		gf_log(this->name, GF_LOG_ERROR, "Can not create dict");
+		ret = ENOMEM;
+		goto error;
+	}
+	return 0;
+ error:
+	if (local->xdata)
+		dict_unref(local->xdata);
+	if (local->fd)
+		fd_unref(local->fd);
+	local->fd = 0;
+	local->loc = NULL;
+	local->newloc = NULL;
+
+	local->op_ret = -1;
+	local->op_errno = ret;
+
+	return ret;
+}
+
+/*
+ * read and verify locked metadata against the old pathname (via open);
+ * update the metadata string in accordance with the new pathname;
+ * submit modified metadata;
+ * wind;
+ */
+static int32_t linkop(call_frame_t *frame,
+		      xlator_t *this,
+		      loc_t *oldloc,
+		      loc_t *newloc,
+		      int flags,
+		      dict_t *xdata,
+		      glusterfs_fop_t op)
+{
+	int32_t ret;
+	dict_t *dict;
+	crypt_local_t *local;
+	void (*unwind_fn)(call_frame_t *frame);
+
+	unwind_fn = linkop_unwind_dispatch(op);
+
+	ret = linkop_grab_local(frame, this, oldloc, newloc, flags, xdata, op);
+	local = frame->local;
+	if (ret)
+		goto error;
+	dict = dict_new();
+	if (!dict) {
+		gf_log(this->name, GF_LOG_ERROR, "Can not create dict");
+		ret = ENOMEM;
+		goto error;
+	}
+	/*
+	 * Set a message to crypt_open() that we need
+	 * locked metadata string.
+	 * All link operations (link, unlink, rename)
+	 * need write lock
+	 */
+	msgflags_set_mtd_wlock(&local->msgflags);
+	ret = dict_set_static_bin(dict,
+				  MSGFLAGS_PREFIX,
+				  &local->msgflags,
+				  sizeof(local->msgflags));
+	if (ret) {
+		gf_log(this->name, GF_LOG_ERROR, "Can not set dict");
+		dict_unref(dict);
+		goto error;
+	}
+	/*
+	 * verify metadata against the old pathname
+	 * and retrieve locked metadata string
+	 */
+	STACK_WIND(frame,
+		   linkop_begin,
+		   this,
+		   this->fops->open, /* crypt_open() */
+		   oldloc,
+		   O_RDWR,
+		   local->fd,
+		   dict);
+	dict_unref(dict);
+	return 0;
+ error:
+	local->op_ret = -1;
+	local->op_errno = ret;
+	unwind_fn(frame);
+	return 0;
+}
+
+static int32_t crypt_link(call_frame_t *frame, xlator_t *this,
+			  loc_t *oldloc, loc_t *newloc, dict_t *xdata)
+{
+	return linkop(frame, this, oldloc, newloc, 0, xdata, GF_FOP_LINK);
+}
+
+static int32_t crypt_unlink(call_frame_t *frame, xlator_t *this,
+			    loc_t *loc, int flags, dict_t *xdata)
+{
+	return linkop(frame, this, loc, NULL, flags, xdata, GF_FOP_UNLINK);
+}
+
+static int32_t crypt_rename(call_frame_t *frame, xlator_t *this,
+			    loc_t *oldloc, loc_t *newloc, dict_t *xdata)
+{
+	return linkop(frame, this, oldloc, newloc, 0, xdata, GF_FOP_RENAME);
+}
+
+static void put_one_call_open(call_frame_t *frame)
+{
+	crypt_local_t *local = frame->local;
+	if (put_one_call(local)) {
+		fd_t *fd = local->fd;
+		loc_t *loc = local->loc;
+		dict_t *xdata = local->xdata;
+
+		STACK_UNWIND_STRICT(open,
+				    frame,
+				    local->op_ret,
+				    local->op_errno,
+				    fd,
+				    xdata);
+		fd_unref(fd);
+		if (xdata)
+			dict_unref(xdata);
+		loc_wipe(loc);
+		GF_FREE(loc);
+	}
+}
+
+static int32_t __crypt_readv_done(call_frame_t *frame,
+				  void *cookie,
+				  xlator_t *this,
+				  int32_t op_ret,
+				  int32_t op_errno, dict_t *xdata)
+{
+	crypt_local_t *local = frame->local;
+	fd_t *local_fd = local->fd;
+	dict_t *local_xdata = local->xdata;
+	/* read deals with data configs only */
+	struct iovec *avec = local->data_conf.avec;
+	char **pool = local->data_conf.pool;
+	int blocks_in_pool = local->data_conf.blocks_in_pool;
+	struct iobref *iobref = local->iobref;
+	struct iobref *iobref_data = local->iobref_data;
+
+	if (op_ret < 0) {
+		gf_log(this->name, GF_LOG_WARNING,
+		       "readv unlock failed (%d)", op_errno);
+		if (local->op_ret >= 0) {
+			local->op_ret = op_ret;
+			local->op_errno = op_errno;
+		}
+	}
+	dump_plain_text(local, avec);
+
+	gf_log("crypt", GF_LOG_DEBUG,
+	       "readv: ret_to_user: %d, iovec len: %d, ia_size: %llu",
+	       (int)(local->rw_count > 0 ? local->rw_count : local->op_ret),
+	       (int)(local->rw_count > 0 ? iovec_get_size(avec, local->data_conf.acount) : 0),
+	       (unsigned long long)local->buf.ia_size);
+
+	STACK_UNWIND_STRICT(readv,
+			    frame,
+			    local->rw_count > 0 ? local->rw_count : local->op_ret,
+			    local->op_errno,
+			    avec,
+			    avec ? local->data_conf.acount : 0,
+			    &local->buf,
+			    local->iobref,
+			    local_xdata);
+
+	free_avec(avec, pool, blocks_in_pool);
+	fd_unref(local_fd);
+	if (local_xdata)
+		dict_unref(local_xdata);
+	if (iobref)
+		iobref_unref(iobref);
+	if (iobref_data)
+		iobref_unref(iobref_data);
+	return 0;
+}
+
+static void crypt_readv_done(call_frame_t *frame, xlator_t *this)
+{
+	if (parent_is_crypt_xlator(frame, this))
+		/*
+		 *  don't unlock (it will be done by the parent)
+		 */
+		__crypt_readv_done(frame, NULL, this, 0, 0, NULL);
+	else {
+		crypt_local_t *local = frame->local;
+		struct gf_flock  lock  = {0, };
+
+		lock.l_type   = F_UNLCK;
+		lock.l_whence = SEEK_SET;
+		lock.l_start  = 0;
+		lock.l_len    = 0;
+		lock.l_pid    = 0;
+
+		STACK_WIND(frame,
+			   __crypt_readv_done,
+			   FIRST_CHILD(this),
+			   FIRST_CHILD(this)->fops->finodelk,
+			   this->name,
+			   local->fd,
+			   F_SETLKW,
+			   &lock,
+			   NULL);
+	}
+}
+
+static void put_one_call_readv(call_frame_t *frame, xlator_t *this)
+{
+	crypt_local_t *local = frame->local;
+	if (put_one_call(local))
+		crypt_readv_done(frame, this);
+}
+
+static int32_t __crypt_writev_done(call_frame_t *frame,
+				   void *cookie,
+				   xlator_t *this,
+				   int32_t op_ret,
+				   int32_t op_errno, dict_t *xdata)
+{
+	crypt_local_t *local = frame->local;
+	fd_t *local_fd = local->fd;
+	dict_t *local_xdata = local->xdata;
+	int32_t ret_to_user;
+
+	if (local->xattr)
+		dict_unref(local->xattr);
+	/*
+	 * Calculate amout of butes to be returned
+	 * to user. We need to subtract paddings that
+	 * have been written as a part of atom.
+	 */
+	/*
+	 * subtract head padding
+	 */
+	if (local->rw_count == 0)
+		/*
+		 * Nothing has been written, it must be an error
+		 */
+		ret_to_user = local->op_ret;
+	else if (local->rw_count <= local->data_conf.off_in_head) {
+		gf_log("crypt", GF_LOG_WARNING, "Incomplete write");
+		ret_to_user = 0;
+	}
+	else
+		ret_to_user = local->rw_count -
+			local->data_conf.off_in_head;
+	/*
+	 * subtract tail padding
+	 */
+	if (ret_to_user > local->data_conf.orig_size)
+		ret_to_user = local->data_conf.orig_size;
+
+	if (local->iobref)
+		iobref_unref(local->iobref);
+	if (local->iobref_data)
+		iobref_unref(local->iobref_data);
+	free_avec_data(local);
+	free_avec_hole(local);
+
+	gf_log("crypt", GF_LOG_DEBUG,
+	       "writev: ret_to_user: %d", ret_to_user);
+
+	STACK_UNWIND_STRICT(writev,
+			    frame,
+			    ret_to_user,
+			    local->op_errno,
+			    &local->prebuf,
+			    &local->postbuf,
+			    local_xdata);
+	fd_unref(local_fd);
+	if (local_xdata)
+		dict_unref(local_xdata);
+	return 0;
+}
+
+static int32_t crypt_writev_done(call_frame_t *frame,
+				 void *cookie,
+				 xlator_t *this,
+				 int32_t op_ret,
+				 int32_t op_errno,
+				 dict_t *xdata)
+{
+	crypt_local_t *local = frame->local;
+
+	if (op_ret < 0)
+		gf_log("crypt", GF_LOG_WARNING, "can not update file size");
+
+	if (parent_is_crypt_xlator(frame, this))
+		/*
+		 * don't unlock (it will be done by the parent)
+		 */
+		__crypt_writev_done(frame, NULL, this, 0, 0, NULL);
+	else {
+		struct gf_flock  lock  = {0, };
+
+		lock.l_type   = F_UNLCK;
+		lock.l_whence = SEEK_SET;
+		lock.l_start  = 0;
+		lock.l_len    = 0;
+		lock.l_pid    = 0;
+
+		STACK_WIND(frame,
+			   __crypt_writev_done,
+			   FIRST_CHILD(this),
+			   FIRST_CHILD(this)->fops->finodelk,
+			   this->name,
+			   local->fd,
+			   F_SETLKW,
+			   &lock,
+			   NULL);
+	}
+	return 0;
+}
+
+static void put_one_call_writev(call_frame_t *frame, xlator_t *this)
+{
+	crypt_local_t *local = frame->local;
+	if (put_one_call(local)) {
+		if (local->update_disk_file_size) {
+			int32_t ret;
+			/*
+			 * update file size, unlock the file and unwind
+			 */
+			ret = dict_set(local->xattr,
+				       FSIZE_XATTR_PREFIX,
+				       data_from_uint64(local->cur_file_size));
+			if (ret) {
+				gf_log("crypt", GF_LOG_WARNING,
+				       "can not set key to update file size");
+				crypt_writev_done(frame, NULL,
+						  this, 0, 0, NULL);
+				return;
+			}
+			gf_log("crypt", GF_LOG_DEBUG,
+			       "Updating disk file size to %llu",
+			       (unsigned long long)local->cur_file_size);
+			STACK_WIND(frame,
+				   crypt_writev_done,
+				   FIRST_CHILD(this),
+				   FIRST_CHILD(this)->fops->fsetxattr,
+				   local->fd,
+				   local->xattr, /* CRYPTO_FORMAT_PREFIX */
+				   0,
+				   NULL);
+		}
+		else
+			crypt_writev_done(frame, NULL, this, 0, 0, NULL);
+	}
+}
+
+static int32_t __crypt_ftruncate_done(call_frame_t *frame,
+				      void *cookie,
+				      xlator_t *this,
+				      int32_t op_ret,
+				      int32_t op_errno, dict_t *xdata)
+{
+	crypt_local_t *local = frame->local;
+	fd_t *local_fd = local->fd;
+	dict_t *local_xdata = local->xdata;
+	char *iobase = local->vec.iov_base;
+
+	if (op_ret < 0) {
+		gf_log(this->name, GF_LOG_WARNING,
+		       "ftruncate unlock failed (%d)", op_errno);
+		if (local->op_ret >= 0) {
+			local->op_ret = op_ret;
+			local->op_errno = op_errno;
+		}
+	}
+	if (local->iobref_data)
+		iobref_unref(local->iobref_data);
+	free_avec_data(local);
+	free_avec_hole(local);
+
+	gf_log("crypt", GF_LOG_DEBUG,
+	       "ftruncate, return to user: presize=%llu, postsize=%llu",
+	       (unsigned long long)local->prebuf.ia_size,
+	       (unsigned long long)local->postbuf.ia_size);
+
+	STACK_UNWIND_STRICT(ftruncate,
+			    frame,
+			    local->op_ret < 0 ? -1 : 0,
+			    local->op_errno,
+			    &local->prebuf,
+			    &local->postbuf,
+			    local_xdata);
+	fd_unref(local_fd);
+	if (local_xdata)
+		dict_unref(local_xdata);
+	if (iobase)
+		GF_FREE(iobase);
+	return 0;
+}
+
+static int32_t crypt_ftruncate_done(call_frame_t *frame,
+				    void *cookie,
+				    xlator_t *this,
+				    int32_t op_ret,
+				    int32_t op_errno,
+				    dict_t *xdata)
+{
+	crypt_local_t *local = frame->local;
+	struct gf_flock  lock  = {0, };
+
+	dict_unref(local->xattr);
+	if (op_ret < 0)
+		gf_log("crypt", GF_LOG_WARNING, "can not update file size");
+
+	lock.l_type   = F_UNLCK;
+	lock.l_whence = SEEK_SET;
+	lock.l_start  = 0;
+	lock.l_len    = 0;
+	lock.l_pid    = 0;
+
+	STACK_WIND(frame,
+		   __crypt_ftruncate_done,
+		   FIRST_CHILD(this),
+		   FIRST_CHILD(this)->fops->finodelk,
+		   this->name,
+		   local->fd,
+		   F_SETLKW,
+		   &lock,
+		   NULL);
+	return 0;
+}
+
+static void put_one_call_ftruncate(call_frame_t *frame, xlator_t *this)
+{
+	crypt_local_t *local = frame->local;
+	if (put_one_call(local)) {
+		if (local->update_disk_file_size) {
+			int32_t ret;
+			/*
+			 * update file size, unlock the file and unwind
+			 */
+			ret = dict_set(local->xattr,
+				       FSIZE_XATTR_PREFIX,
+				       data_from_uint64(local->cur_file_size));
+			if (ret) {
+				gf_log("crypt", GF_LOG_WARNING,
+				       "can not set key to update file size");
+				crypt_ftruncate_done(frame, NULL,
+						     this, 0, 0, NULL);
+				return;
+			}
+			gf_log("crypt", GF_LOG_DEBUG,
+			       "Updating disk file size to %llu",
+			       (unsigned long long)local->cur_file_size);
+			STACK_WIND(frame,
+				   crypt_ftruncate_done,
+				   FIRST_CHILD(this),
+				   FIRST_CHILD(this)->fops->fsetxattr,
+				   local->fd,
+				   local->xattr, /* CRYPTO_FORMAT_PREFIX */
+				   0,
+				   NULL);
+		}
+		else
+			crypt_ftruncate_done(frame, NULL, this, 0, 0, NULL);
+	}
+}
+
+/*
+ * load regular file size for some FOPs
+ */
+static int32_t load_file_size(call_frame_t *frame,
+			      void *cookie,
+			      xlator_t *this,
+			      int32_t op_ret,
+			      int32_t op_errno,
+			      dict_t *dict,
+			      dict_t *xdata)
+{
+	data_t *data;
+	crypt_local_t *local = frame->local;
+
+	dict_t *local_xdata = local->xdata;
+	inode_t *local_inode = local->inode;
+
+	if (op_ret < 0)
+		goto unwind;
+	/*
+	 * load regular file size
+	 */
+	data = dict_get(dict, FSIZE_XATTR_PREFIX);
+	if (!data) {
+		if (local->xdata)
+			dict_unref(local->xdata);
+		gf_log("crypt", GF_LOG_WARNING, "Regular file size not found");
+		op_ret = -1;
+		op_errno = EIO;
+		goto unwind;
+	}
+	local->buf.ia_size = data_to_uint64(data);
+
+	gf_log(this->name, GF_LOG_DEBUG,
+	       "FOP %d: Translate regular file to %llu",
+	       local->fop,
+	       (unsigned long long)local->buf.ia_size);
+ unwind:	
+	if (local->fd)
+		fd_unref(local->fd);
+	if (local->loc) {
+		loc_wipe(local->loc);
+		GF_FREE(local->loc);
+	}
+	switch (local->fop) {
+	case GF_FOP_FSTAT:
+		STACK_UNWIND_STRICT(fstat,
+				    frame,
+				    op_ret,
+				    op_errno,
+				    op_ret >= 0 ? &local->buf : NULL,
+				    local->xdata);
+		break;
+	case GF_FOP_STAT:
+		STACK_UNWIND_STRICT(stat,
+				    frame,
+				    op_ret,
+				    op_errno,
+				    op_ret >= 0 ? &local->buf : NULL,
+				    local->xdata);
+		break;
+	case GF_FOP_LOOKUP:
+		STACK_UNWIND_STRICT(lookup,
+				    frame,
+				    op_ret,
+				    op_errno,
+				    op_ret >= 0 ? local->inode : NULL,
+				    op_ret >= 0 ? &local->buf : NULL,				    
+				    local->xdata,
+				    op_ret >= 0 ? &local->postbuf : NULL);
+		break;
+	case GF_FOP_READ:
+		STACK_UNWIND_STRICT(readv,
+				    frame,
+				    op_ret,
+				    op_errno,
+				    NULL,
+				    0,
+				    op_ret >= 0 ? &local->buf : NULL,
+				    NULL,
+				    NULL);
+		break;
+	default:
+		gf_log(this->name, GF_LOG_WARNING,
+		       "Improper file operation %d", local->fop);
+	}
+	if (local_xdata)
+		dict_unref(local_xdata);
+	if (local_inode)
+		inode_unref(local_inode);
+	return 0;
+}
+
+static int32_t crypt_stat_common_cbk(call_frame_t *frame,
+				     void *cookie,
+				     xlator_t *this,
+				     int32_t op_ret,
+				     int32_t op_errno,
+				     struct iatt *buf, dict_t *xdata)
+{
+	crypt_local_t *local = frame->local;
+
+	if (op_ret < 0)
+		goto unwind;
+	if (!IA_ISREG(buf->ia_type))
+		goto unwind;
+
+	local->buf = *buf;
+	if (xdata)
+		local->xdata = dict_ref(xdata);
+
+	switch (local->fop) {
+	case GF_FOP_FSTAT:
+		STACK_WIND(frame,
+			   load_file_size,
+			   FIRST_CHILD(this),
+			   FIRST_CHILD(this)->fops->fgetxattr,
+			   local->fd,
+			   FSIZE_XATTR_PREFIX,
+			   NULL);
+		break;
+	case GF_FOP_STAT:
+		STACK_WIND(frame,
+			   load_file_size,
+			   FIRST_CHILD(this),
+			   FIRST_CHILD(this)->fops->getxattr,
+			   local->loc,
+			   FSIZE_XATTR_PREFIX,
+			   NULL);
+		break;
+	default:
+		gf_log (this->name, GF_LOG_WARNING,
+			"Improper file operation %d", local->fop);
+	}
+	return 0;
+ unwind:
+	if (local->fd)
+		fd_unref(local->fd);
+	if (local->loc) {
+		loc_wipe(local->loc);
+		GF_FREE(local->loc);
+	}
+	switch (local->fop) {
+	case GF_FOP_FSTAT:
+		STACK_UNWIND_STRICT(fstat,
+				    frame,
+				    op_ret,
+				    op_errno,
+				    op_ret >= 0 ? buf : NULL,
+				    op_ret >= 0 ? xdata : NULL);
+		break;
+	case GF_FOP_STAT:
+		STACK_UNWIND_STRICT(stat,
+				    frame,
+				    op_ret,
+				    op_errno,
+				    op_ret >= 0 ? buf : NULL,
+				    op_ret >= 0 ? xdata : NULL);
+		break;
+	default:
+		gf_log (this->name, GF_LOG_WARNING,
+			"Improper file operation %d", local->fop);
+	}
+	return 0;
+}
+
+static int32_t crypt_fstat(call_frame_t *frame,
+			   xlator_t *this,
+			   fd_t *fd, dict_t *xdata)
+{
+	crypt_local_t *local;
+
+	local = crypt_alloc_local(frame, this, GF_FOP_FSTAT);
+	if (!local)
+		goto error;
+	local->fd = fd_ref(fd);
+	STACK_WIND(frame,
+		   crypt_stat_common_cbk,
+		   FIRST_CHILD(this),
+		   FIRST_CHILD(this)->fops->fstat,
+		   fd,
+		   xdata);	
+	return 0;
+ error:
+	STACK_UNWIND_STRICT(fstat,
+			    frame,
+			    -1,
+			    ENOMEM,
+			    NULL,
+			    NULL);
+	return 0;
+}
+
+static int32_t crypt_stat(call_frame_t *frame,
+			  xlator_t *this,
+			  loc_t *loc, dict_t *xdata)
+{
+	int32_t ret;
+	crypt_local_t *local;
+
+	local = crypt_alloc_local(frame, this, GF_FOP_STAT);
+	if (!local)
+		goto error;
+	local->loc = GF_CALLOC(1, sizeof(*loc), gf_crypt_mt_loc);
+	if (!local->loc)
+		goto error;
+	memset(local->loc, 0, sizeof(*local->loc));
+	ret = loc_copy(local->loc, loc);
+	if (ret) {
+		GF_FREE(local->loc);
+		goto error;
+	}
+	STACK_WIND(frame,
+		   crypt_stat_common_cbk,
+		   FIRST_CHILD(this),
+		   FIRST_CHILD(this)->fops->stat,
+		   loc,
+		   xdata);	
+	return 0;
+ error:
+	STACK_UNWIND_STRICT(stat,
+			    frame,
+			    -1,
+			    ENOMEM,
+			    NULL,
+			    NULL);
+	return 0;
+}
+
+static int32_t crypt_lookup_cbk(call_frame_t *frame,
+				void *cookie,
+				xlator_t *this,
+				int32_t op_ret,
+				int32_t op_errno,
+				inode_t *inode,
+				struct iatt *buf, dict_t *xdata,
+				struct iatt *postparent)
+{
+	crypt_local_t *local = frame->local;
+
+	if (op_ret < 0)
+		goto unwind;
+	if (!IA_ISREG(buf->ia_type))
+		goto unwind;
+
+	local->inode = inode_ref(inode);
+	local->buf = *buf;
+	local->postbuf = *postparent;
+	if (xdata)
+		local->xdata = dict_ref(xdata);
+	uuid_copy(local->loc->gfid, buf->ia_gfid);
+
+	STACK_WIND(frame,
+		   load_file_size,
+		   FIRST_CHILD(this),
+		   FIRST_CHILD(this)->fops->getxattr,
+		   local->loc,
+		   FSIZE_XATTR_PREFIX,
+		   NULL);
+	return 0;
+ unwind:
+	loc_wipe(local->loc);
+	GF_FREE(local->loc);
+	STACK_UNWIND_STRICT(lookup,
+			    frame,
+			    op_ret,
+			    op_errno,
+			    inode,
+			    buf,
+			    xdata,
+			    postparent);
+	return 0;
+}
+
+static int32_t crypt_lookup(call_frame_t *frame,
+			    xlator_t *this,
+			    loc_t *loc, dict_t *xdata)
+{
+	int32_t ret;
+	crypt_local_t *local;
+
+	local = crypt_alloc_local(frame, this, GF_FOP_LOOKUP);
+	if (!local)
+		goto error;
+	local->loc = GF_CALLOC(1, sizeof(*loc), gf_crypt_mt_loc);
+	if (!local->loc)
+		goto error;
+	memset(local->loc, 0, sizeof(*local->loc));
+	ret = loc_copy(local->loc, loc);
+	if (ret) {
+		GF_FREE(local->loc);
+		goto error;
+	}
+	gf_log(this->name, GF_LOG_DEBUG, "Lookup %s", loc->path);
+	STACK_WIND(frame,
+		   crypt_lookup_cbk,
+		   FIRST_CHILD(this),
+		   FIRST_CHILD(this)->fops->lookup,
+		   loc,
+		   xdata);
+	return 0;
+ error:
+	STACK_UNWIND_STRICT(lookup,
+			    frame,
+			    -1,
+			    ENOMEM,
+			    NULL,
+			    NULL,
+			    NULL,
+			    NULL);
+	return 0;
+}
+
+/*
+ * for every regular directory entry find its real file size
+ * and update stat's buf properly
+ */
+static int32_t crypt_readdirp_cbk(call_frame_t *frame,
+				  void *cookie,
+				  xlator_t *this,
+				  int32_t op_ret,
+				  int32_t op_errno,
+				  gf_dirent_t *entries, dict_t *xdata)
+{
+	gf_dirent_t *entry = NULL;
+
+	if (op_ret < 0)
+		goto unwind;
+
+	list_for_each_entry (entry, (&entries->list), list) {
+		data_t *data;
+
+		if (!IA_ISREG(entry->d_stat.ia_type))
+			continue;
+		data = dict_get(entry->dict, FSIZE_XATTR_PREFIX);
+		if (!data){
+			gf_log("crypt", GF_LOG_WARNING,
+			       "Regular file size of direntry not found");
+			op_errno = EIO;
+			op_ret = -1;
+			break;
+		}
+		entry->d_stat.ia_size = data_to_uint64(data);
+	}
+ unwind:
+	STACK_UNWIND_STRICT(readdirp, frame, op_ret, op_errno, entries, xdata);
+	return 0;
+}
+
+/*
+ * ->readdirp() fills in-core inodes, so we need to set proper
+ * file sizes for all directory entries of the parent @fd.
+ * Actual updates take place in ->crypt_readdirp_cbk()
+ */
+static int32_t crypt_readdirp(call_frame_t *frame, xlator_t *this,
+			      fd_t *fd, size_t size, off_t offset,
+			      dict_t *xdata)
+{
+	int32_t ret = ENOMEM;
+
+	if (!xdata) {
+		xdata = dict_new();
+		if (!xdata)
+			goto error;
+	}
+	else
+		dict_ref(xdata);
+	/*
+	 * make sure that we'll have real file sizes at ->readdirp_cbk()
+	 */
+	ret = dict_set(xdata, FSIZE_XATTR_PREFIX, data_from_uint64(0));
+	if (ret) {
+		dict_unref(xdata);
+		goto error;
+	}
+	STACK_WIND(frame,
+		   crypt_readdirp_cbk,
+		   FIRST_CHILD(this),
+		   FIRST_CHILD(this)->fops->readdirp,
+		   fd,
+		   size,
+		   offset,
+		   xdata);
+	dict_unref(xdata);
+	return 0;
+ error:
+	STACK_UNWIND_STRICT(readdirp, frame, -1, ret, NULL, NULL);
+	return 0;
+}
+
+static int32_t crypt_access(call_frame_t *frame,
+			    xlator_t *this,
+			    loc_t *loc,
+			    int32_t mask, dict_t *xdata)
+{
+	gf_log(this->name, GF_LOG_WARNING,
+	       "NFS mounts of encrypted volumes are unsupported");
+	STACK_UNWIND_STRICT(access, frame, -1, EPERM, NULL);
+	return 0;
+}
+
+int32_t master_set_block_size (xlator_t *this, crypt_private_t *priv,
+			       dict_t *options)
+{
+	uint64_t block_size = 0;
+	struct master_cipher_info *master = get_master_cinfo(priv);
+
+	if (options != NULL)
+		GF_OPTION_RECONF("block-size", block_size, options,
+				 size, error);
+	else
+		GF_OPTION_INIT("block-size", block_size, size, error);
+
+	switch (block_size) {
+	case 512:
+		master->m_block_bits = 9;
+		break;
+	case 1024:
+		master->m_block_bits = 10;
+		break;
+	case 2048:
+		master->m_block_bits = 11;
+		break;
+	case 4096:
+		master->m_block_bits = 12;
+		break;
+	default:
+		gf_log("crypt", GF_LOG_ERROR,
+		       "FATAL: unsupported block size %llu",
+		       (unsigned long long)block_size);
+		goto error;
+	}
+	return 0;
+ error:
+	return -1;
+}
+
+int32_t master_set_alg(xlator_t *this, crypt_private_t *priv)
+{
+	struct master_cipher_info *master = get_master_cinfo(priv);
+	master->m_alg = AES_CIPHER_ALG;
+	return 0;
+}
+
+int32_t master_set_mode(xlator_t *this, crypt_private_t *priv)
+{
+	struct master_cipher_info *master = get_master_cinfo(priv);
+	master->m_mode = XTS_CIPHER_MODE;
+	return 0;
+}
+
+/*
+ * set key size in bits to the master info
+ * Pre-conditions: cipher mode in the master info is uptodate.
+ */
+static int master_set_data_key_size (xlator_t *this, crypt_private_t *priv,
+				     dict_t *options)
+{
+	int32_t ret;
+	uint64_t key_size = 0;
+	struct master_cipher_info *master = get_master_cinfo(priv);
+
+	if (options != NULL)
+		GF_OPTION_RECONF("data-key-size", key_size, options,
+				 size, error);
+	else
+		GF_OPTION_INIT("data-key-size", key_size, size, error);
+
+	ret = data_cipher_algs[master->m_alg][master->m_mode].check_key(key_size);
+	if (ret) {
+		gf_log("crypt", GF_LOG_ERROR,
+		       "FATAL: wrong bin key size %llu for alg %d mode %d",
+		       (unsigned long long)key_size,
+		       (int)master->m_alg,
+		       (int)master->m_mode);
+		goto error;
+	}
+	master->m_dkey_size = key_size;
+	return 0;
+ error:
+	return -1;
+}
+
+static int is_hex(char *s) {
+	return  ('0' <= *s && *s <= '9') || ('a' <= *s && *s <= 'f');
+}
+
+static int parse_hex_buf(xlator_t *this, char *src, unsigned char *dst,
+			 int hex_size)
+{
+	int i;
+	int hex_byte = 0;
+
+	for (i = 0; i < (hex_size / 2); i++) {
+		if (!is_hex(src + i*2) || !is_hex(src + i*2 + 1)) {
+			gf_log("crypt", GF_LOG_ERROR,
+			       "FATAL: not hex symbol in key");
+			return -1;
+		}
+		if (sscanf(src + i*2, "%2x", &hex_byte) != 1) {
+			gf_log("crypt", GF_LOG_ERROR,
+			       "FATAL: can not parse hex key");
+			return -1;
+		}
+		dst[i] = hex_byte & 0xff;
+	}
+	return 0;
+}
+
+/*
+ * Parse options;
+ * install master volume key
+ */
+int32_t master_set_master_vol_key(xlator_t *this, crypt_private_t *priv)
+{
+	int32_t ret;
+	FILE *file = NULL;
+
+	int32_t key_size;
+	char *opt_key_file_pathname = NULL;
+
+	unsigned char bin_buf[MASTER_VOL_KEY_SIZE];
+	char hex_buf[2 * MASTER_VOL_KEY_SIZE];
+
+	struct master_cipher_info *master = get_master_cinfo(priv);
+	/*
+	 * extract master key passed via option
+	 */
+	GF_OPTION_INIT("master-key", opt_key_file_pathname, path, bad_key);
+
+	if (!opt_key_file_pathname) {
+		gf_log(this->name, GF_LOG_ERROR, "FATAL: missing master key");
+		return -1;
+	}
+	gf_log(this->name, GF_LOG_DEBUG, "handling file key %s",
+	       opt_key_file_pathname);
+
+	file = fopen(opt_key_file_pathname, "r");
+	if (file == NULL) {
+		gf_log(this->name, GF_LOG_ERROR,
+		       "FATAL: can not open file with master key");
+		return -1;
+	}
+	/*
+	 * extract hex key
+	 */
+	key_size = fread(hex_buf, 1, sizeof(hex_buf), file);
+	if (key_size < sizeof(hex_buf)) {
+		gf_log(this->name, GF_LOG_ERROR,
+		       "FATAL: master key is too short");
+		goto bad_key;
+	}
+	ret = parse_hex_buf(this, hex_buf, bin_buf, key_size);
+	if (ret)
+		goto bad_key;
+	memcpy(master->m_key, bin_buf, MASTER_VOL_KEY_SIZE);
+	memset(hex_buf, 0, sizeof(hex_buf));
+	fclose(file);
+
+ 	memset(bin_buf, 0, sizeof(bin_buf));
+	return 0;
+ bad_key:
+	gf_log(this->name, GF_LOG_ERROR, "FATAL: bad master key");
+	if (file)
+		fclose(file);
+	memset(bin_buf, 0, sizeof(bin_buf));
+	return -1;
+}
+
+/*
+ * Derive volume key for object-id authentication
+ */
+int32_t master_set_nmtd_vol_key(xlator_t *this, crypt_private_t *priv)
+{
+	return get_nmtd_vol_key(get_master_cinfo(priv));
+}
+
+int32_t crypt_init_xlator(xlator_t *this)
+{
+	int32_t ret;
+	crypt_private_t *priv = this->private; 
+
+	ret = master_set_alg(this, priv);
+	if (ret)
+		return ret;
+	ret = master_set_mode(this, priv);
+	if (ret)
+		return ret;
+	ret = master_set_block_size(this, priv, NULL);
+	if (ret)
+		return ret;
+	ret = master_set_data_key_size(this, priv, NULL);
+	if (ret)
+		return ret;
+	ret = master_set_master_vol_key(this, priv);
+	if (ret)
+		return ret;
+	return master_set_nmtd_vol_key(this, priv);
+}
+
+static int32_t crypt_alloc_private(xlator_t *this)
+{
+	this->private = GF_CALLOC(1, sizeof(crypt_private_t), gf_crypt_mt_priv);
+	if (!this->private) {
+		gf_log("crypt", GF_LOG_ERROR,
+		       "Can not allocate memory for private data");
+		return ENOMEM;
+	}
+	return 0;
+}
+
+static void crypt_free_private(xlator_t *this)
+{
+	crypt_private_t *priv = this->private;
+	if (priv) {
+		memset(priv, 0, sizeof(*priv));
+		GF_FREE(priv);
+	}
+}
+
+int32_t reconfigure (xlator_t *this, dict_t *options)
+{
+	int32_t ret = -1;
+	crypt_private_t *priv = NULL;
+
+	GF_VALIDATE_OR_GOTO ("crypt", this, error);
+	GF_VALIDATE_OR_GOTO (this->name, this->private, error);
+	GF_VALIDATE_OR_GOTO (this->name, options, error);
+
+	priv = this->private;
+
+	ret = master_set_block_size(this, priv, options);
+	if (ret) {
+		gf_log("this->name", GF_LOG_ERROR,
+		       "Failed to reconfure block size");
+		goto error;
+	}
+	ret = master_set_data_key_size(this, priv, options);
+	if (ret) {
+		gf_log("this->name", GF_LOG_ERROR,
+		       "Failed to reconfure data key size");
+		goto error;
+	}
+	return 0;
+ error:
+	return ret;
+}
+
+int32_t init(xlator_t *this)
+{
+	int32_t ret;
+
+	if (!this->children || this->children->next) {
+		gf_log ("crypt", GF_LOG_ERROR,
+			"FATAL: crypt should have exactly one child");
+		return EINVAL;
+	}
+	if (!this->parents) {
+		gf_log (this->name, GF_LOG_WARNING,
+			"dangling volume. check volfile ");
+	}
+	ret = crypt_alloc_private(this);
+	if (ret)
+		return ret;
+	ret = crypt_init_xlator(this);
+	if (ret)
+		goto error;
+	this->local_pool = mem_pool_new(crypt_local_t, 64);
+        if (!this->local_pool) {
+		gf_log(this->name, GF_LOG_ERROR,
+		       "failed to create local_t's memory pool");
+		ret = ENOMEM;
+                goto error;
+        }
+	gf_log ("crypt", GF_LOG_INFO, "crypt xlator loaded");
+	return 0;
+ error:
+	crypt_free_private(this);
+	return ret;
+}
+
+void fini (xlator_t *this)
+{
+	crypt_free_private(this);
+}
+
+struct xlator_fops fops = {
+	.readv        = crypt_readv,
+	.writev       = crypt_writev,
+	.truncate     = crypt_truncate,
+	.ftruncate    = crypt_ftruncate,
+	.setxattr     = crypt_setxattr,
+	.fsetxattr    = crypt_fsetxattr,
+	.link         = crypt_link,
+	.unlink       = crypt_unlink,
+	.rename       = crypt_rename,
+	.open         = crypt_open,
+	.create       = crypt_create,
+	.stat         = crypt_stat,
+	.fstat        = crypt_fstat,
+	.lookup       = crypt_lookup,
+	.readdirp     = crypt_readdirp,
+	.access       = crypt_access   
+};
+
+struct xlator_cbks cbks = {
+	.forget       = crypt_forget
+};
+
+struct volume_options options[] = {
+	{ .key = {"master-key"},
+	  .type = GF_OPTION_TYPE_PATH,
+	  .description = "Pathname of regular file which contains master volume key"
+	},
+	{ .key = {"data-key-size"},
+	  .type = GF_OPTION_TYPE_SIZET,
+	  .description = "Data key size (bits)",
+	  .min = 256,
+	  .max = 512,
+	  .default_value = "256",
+	},
+	{ .key = {"block-size"},
+	  .type = GF_OPTION_TYPE_SIZET,
+	  .description = "Atom size (bits)",
+	  .min = 512,
+	  .max = 4096,
+	  .default_value = "4096"
+	},
+	{ .key  = {NULL} },
+};
+
+/*
+  Local variables:
+  c-indentation-style: "K&R"
+  mode-name: "LC"
+  c-basic-offset: 8
+  tab-width: 8
+  fill-column: 80
+  scroll-step: 1
+  End:
+*/
diff --git a/xlators/encryption/crypt/src/crypt.h b/xlators/encryption/crypt/src/crypt.h
new file mode 100644
index 000000000..01a8542ab
--- /dev/null
+++ b/xlators/encryption/crypt/src/crypt.h
@@ -0,0 +1,899 @@
+/*
+  Copyright (c) 2008-2012 Red Hat, Inc. <http://www.redhat.com>
+  This file is part of GlusterFS.
+
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
+*/
+
+#ifndef __CRYPT_H__
+#define __CRYPT_H__
+
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+#include <openssl/aes.h>
+#include <openssl/evp.h>
+#include <openssl/sha.h>
+#include <openssl/hmac.h>
+#include <openssl/cmac.h>
+#include <openssl/modes.h>
+#include "crypt-mem-types.h"
+
+#define CRYPT_XLATOR_ID  (0)
+
+#define MAX_IOVEC_BITS (3)
+#define MAX_IOVEC (1 << MAX_IOVEC_BITS)
+#define KEY_FACTOR_BITS  (6)
+
+#define DEBUG_CRYPT (0)
+#define TRIVIAL_TFM (0)
+
+#define CRYPT_MIN_BLOCK_BITS (9)
+#define CRYPT_MAX_BLOCK_BITS (12)
+
+#define MASTER_VOL_KEY_SIZE (32)
+#define NMTD_VOL_KEY_SIZE (16)
+
+struct crypt_key {
+	uint32_t len;
+	const char *label;	
+};
+
+/*
+ * Add new key types to the end of this
+ * enumeration but before LAST_KEY_TYPE
+ */
+typedef enum {
+	MASTER_VOL_KEY,
+	NMTD_VOL_KEY,
+	NMTD_LINK_KEY,
+	EMTD_FILE_KEY,
+	DATA_FILE_KEY_256,
+	DATA_FILE_KEY_512,
+	LAST_KEY_TYPE
+}crypt_key_type;
+
+struct kderive_context {
+	const unsigned char *pkey;/* parent key */
+	uint32_t pkey_len;        /* parent key size, bits */
+	uint32_t ckey_len;        /* child key size, bits */
+	unsigned char *fid;       /* fixed input data, NIST 800-108, 5.1 */
+	uint32_t fid_len;         /* fid len, bytes */
+	unsigned char *out;       /* contains child keying material */
+	uint32_t out_len;         /* out len, bytes */
+};
+
+typedef enum {
+	DATA_ATOM,
+	HOLE_ATOM,
+	LAST_DATA_TYPE
+}atom_data_type;
+
+typedef enum {
+	HEAD_ATOM,
+	TAIL_ATOM,
+	FULL_ATOM,
+	LAST_LOCALITY_TYPE
+}atom_locality_type;
+
+typedef enum {
+	MTD_CREATE,
+	MTD_APPEND,
+	MTD_OVERWRITE,
+	MTD_CUT,
+	MTD_LAST_OP
+} mtd_op_t;
+
+struct xts128_context {
+	void      *key1, *key2;
+	block128_f block1,block2;
+};
+
+struct object_cipher_info {
+	cipher_alg_t  o_alg;
+        cipher_mode_t o_mode;
+	uint32_t      o_block_bits;
+        uint32_t      o_dkey_size; /* raw data key size in bits */
+	union {
+		struct {
+			unsigned char ivec[16];
+			AES_KEY dkey[2];
+			AES_KEY tkey;    /* key used for tweaking */
+			XTS128_CONTEXT xts;
+		} aes_xts;
+	} u;
+};
+
+struct master_cipher_info {
+	/*
+	 * attributes inherited by newly created regular files
+	 */
+	cipher_alg_t  m_alg;
+        cipher_mode_t m_mode;
+	uint32_t      m_block_bits;
+        uint32_t      m_dkey_size; /* raw key size in bits */
+	/*
+	 * master key
+	 */
+	unsigned char m_key[MASTER_VOL_KEY_SIZE];
+	/* 
+	 * volume key for oid authentication
+	 */
+	unsigned char m_nmtd_key[NMTD_VOL_KEY_SIZE];
+};
+
+/*
+* This info is not changed during file's life
+ */
+struct crypt_inode_info {
+#if DEBUG_CRYPT
+	loc_t *loc; /* pathname that the file has been
+		       opened, or created with */
+#endif
+	uint16_t nr_minor;
+	uuid_t oid;
+	struct object_cipher_info cinfo;
+};
+
+/*
+ * this should locate in secure memory
+ */
+typedef struct {
+	struct master_cipher_info master;
+} crypt_private_t;
+
+static inline struct master_cipher_info *get_master_cinfo(crypt_private_t *priv)
+{
+	return &priv->master;
+}
+
+static inline struct object_cipher_info *get_object_cinfo(struct crypt_inode_info
+							 *info)
+{
+	return &info->cinfo;
+}
+
+/*
+ * this describes layouts and properties
+ * of atoms in an aligned vector
+ */
+struct avec_config {
+	uint32_t atom_size;
+	atom_data_type type;
+	size_t orig_size;
+	off_t orig_offset;
+	size_t expanded_size;
+	off_t aligned_offset;
+
+	uint32_t off_in_head;
+	uint32_t off_in_tail;
+	uint32_t gap_in_tail;
+	uint32_t nr_full_blocks;
+
+	struct iovec *avec; /* aligned vector */
+	uint32_t acount; /* number of avec components. The same
+			  * as number of occupied logical blocks */
+	char **pool;
+	uint32_t blocks_in_pool;
+	uint32_t cursor; /* makes sense only for ordered writes,
+			  * so there is no races on this counter.
+			  *
+			  * Cursor is per-config object, we don't
+			  * reset cursor for atoms of different
+			  * localities (head, tail, full)
+			  */
+};
+
+
+typedef struct {
+	glusterfs_fop_t fop; /* code of FOP this local info built for */
+	fd_t *fd;
+	inode_t *inode;
+	loc_t *loc;
+	int32_t mac_idx;
+	loc_t *newloc;
+	int32_t flags;
+	int32_t wbflags;
+	struct crypt_inode_info *info;
+	struct iobref *iobref;
+	struct iobref *iobref_data;
+	off_t offset;
+
+	uint64_t old_file_size; /* per FOP, retrieved under lock held */
+	uint64_t cur_file_size; /* per iteration, before issuing IOs */
+	uint64_t new_file_size; /* per iteration, after issuing IOs */
+
+	uint64_t io_offset; /* offset of IOs issued per iteration */
+	uint64_t io_offset_nopad; /* offset of user's data in the atom */
+	uint32_t io_size; /* size of IOs issued per iteration */
+	uint32_t io_size_nopad; /* size of user's data in the IOs */
+	uint32_t eof_padding_size; /* size od EOF padding in the IOs */
+
+	gf_lock_t call_lock; /* protect nr_calls from many cbks */
+	int32_t nr_calls;
+
+	atom_data_type active_setup; /* which setup (hole or date)
+					is currently active */
+	/* data setup */
+	struct avec_config data_conf;
+
+	/* hole setup */
+	int hole_conv_in_proggress;
+	gf_lock_t hole_lock; /* protect hole config from many cbks */
+	int hole_handled;
+	struct avec_config hole_conf;
+	struct iatt buf;
+	struct iatt prebuf;
+	struct iatt postbuf;
+	struct iatt *prenewparent;
+	struct iatt *postnewparent;
+	int32_t op_ret;
+	int32_t op_errno;
+	int32_t rw_count; /* total read or written */
+	gf_lock_t rw_count_lock; /* protect the counter above */
+	unsigned char *format; /* for create, update format string */
+	uint32_t format_size;
+	uint32_t msgflags; /* messages for crypt_open() */
+	dict_t *xdata;
+	dict_t *xattr;
+	struct iovec vec; /* contains last file's atom for
+			     read-prune-write sequence */
+	gf_boolean_t custom_mtd;
+	/*
+	 * the next 3 fields are used by readdir and friends
+	 */
+	gf_dirent_t *de; /* directory entry */
+	char *de_path; /* pathname of directory entry */
+	uint32_t de_prefix_len; /* lenght of the parent's pathname */
+	gf_dirent_t *entries;
+
+	uint32_t update_disk_file_size:1;
+} crypt_local_t;
+
+/* This represents a (read)modify-write atom */
+struct rmw_atom {
+	atom_locality_type locality;
+	/*
+	 * read-modify-write sequence of the atom
+	 */
+	int32_t (*rmw)(call_frame_t *frame,
+		       void *cookie,
+		       xlator_t *this,
+		       int32_t op_ret,
+		       int32_t op_errno,
+		       struct iovec *vec,
+		       int32_t count,
+		       struct iatt *stbuf,
+		       struct iobref *iobref,
+		       dict_t *xdata);
+	/*
+	 * offset of the logical block in a file
+	 */
+	loff_t (*offset_at)(call_frame_t *frame,
+			    struct object_cipher_info *object);
+	/*
+	 * IO offset in an atom
+	 */
+	uint32_t (*offset_in)(call_frame_t *frame,
+			      struct object_cipher_info *object);
+	/*
+	 * number of bytes of plain text of this atom that user
+	 * wants to read/write.
+	 * It can be smaller than atom_size in the case of head
+	 * or tail atoms.
+	 */
+	uint32_t (*io_size_nopad)(call_frame_t *frame,
+				  struct object_cipher_info *object);
+	/*
+	 * which iovec represents the atom
+	 */
+	struct iovec *(*get_iovec)(call_frame_t *frame, uint32_t count);
+	/*
+	 * how many bytes of partial block should be uptodated by
+	 * reading from disk.
+	 * This is used to perform a read component of RMW (read-modify-write).
+	 */
+	uint32_t (*count_to_uptodate)(call_frame_t *frame, struct object_cipher_info *object);
+	struct avec_config *(*get_config)(call_frame_t *frame);
+};
+
+struct data_cipher_alg {
+	gf_boolean_t atomic; /* true means that algorithm requires
+				to pad data before cipher transform */
+	gf_boolean_t should_pad; /* true means that algorithm requires
+				    to pad the end of file with extra-data */
+	uint32_t blkbits; /* blksize = 1 << blkbits */
+	/*
+	 * any preliminary sanity checks goes here
+	 */
+	int32_t (*init)(void);
+	/*
+	 * set alg-mode specific inode info
+	 */
+	int32_t (*set_private)(struct crypt_inode_info *info,
+			       struct master_cipher_info *master);
+	/*
+	 * check alg-mode specific data key
+	 */
+	int32_t (*check_key)(uint32_t key_size);
+	void (*set_iv)(off_t offset, struct object_cipher_info *object);
+	int32_t (*encrypt)(const unsigned char *from, unsigned char *to,
+			   size_t length, off_t offset, const int enc,
+			   struct object_cipher_info *object);
+};
+
+/*
+ * version-dependent metadata loader
+ */
+struct crypt_mtd_loader {
+	/*
+	 * return core format size
+	 */
+	size_t (*format_size)(mtd_op_t op, size_t old_size);
+	/*
+	 * pack version-specific metadata of an object
+	 * at ->create()
+	 */
+	int32_t (*create_format)(unsigned char *wire,
+				 loc_t *loc,
+				 struct crypt_inode_info *info,
+				 struct master_cipher_info *master);
+	/*
+	 * extract version-specific metadata of an object
+	 * at ->open() time
+	 */
+	int32_t (*open_format)(unsigned char *wire,
+			       int32_t len,
+			       loc_t *loc,
+			       struct crypt_inode_info *info,
+			       struct master_cipher_info *master,
+			       crypt_local_t *local,
+			       gf_boolean_t load_info);
+	int32_t (*update_format)(unsigned char *new,
+				 unsigned char *old,
+				 size_t old_len,
+				 int32_t mac_idx,
+				 mtd_op_t op,
+				 loc_t *loc,
+				 struct crypt_inode_info *info,
+				 struct master_cipher_info *master,
+				 crypt_local_t *local);
+};
+
+typedef int32_t (*end_writeback_handler_t)(call_frame_t *frame,
+					   void *cookie,
+					   xlator_t *this,
+					   int32_t op_ret,
+					   int32_t op_errno,
+					   struct iatt *prebuf,
+					   struct iatt *postbuf,
+					   dict_t *xdata);
+typedef void (*linkop_wind_handler_t)(call_frame_t *frame, xlator_t *this);
+typedef void (*linkop_unwind_handler_t)(call_frame_t *frame);
+
+
+/* Declarations */
+
+/* keys.c */
+extern struct crypt_key crypt_keys[LAST_KEY_TYPE];
+int32_t get_nmtd_vol_key(struct master_cipher_info *master);
+int32_t get_nmtd_link_key(loc_t *loc,
+			  struct master_cipher_info *master,
+			  unsigned char *result);
+int32_t get_emtd_file_key(struct crypt_inode_info *info,
+			  struct master_cipher_info *master,
+			  unsigned char *result);
+int32_t get_data_file_key(struct crypt_inode_info *info,
+			  struct master_cipher_info *master,
+			  uint32_t keysize,
+			  unsigned char *key);
+/* data.c */
+extern struct data_cipher_alg data_cipher_algs[LAST_CIPHER_ALG][LAST_CIPHER_MODE];
+void encrypt_aligned_iov(struct object_cipher_info *object,
+			 struct iovec *vec,
+			 int count,
+			 off_t off);
+void decrypt_aligned_iov(struct object_cipher_info *object,
+			 struct iovec *vec,
+			 int count,
+			 off_t off);
+int32_t align_iov_by_atoms(xlator_t *this,
+			   crypt_local_t *local,
+			   struct object_cipher_info *object,
+			   struct iovec *vec /* input vector */,
+			   int32_t count /* number of vec components */,
+			   struct iovec *avec /* aligned vector */,
+			   char **blocks /* pool of blocks */,
+			   uint32_t *blocks_allocated,
+			   struct avec_config *conf);
+int32_t set_config_avec_data(xlator_t *this,
+			     crypt_local_t *local,
+			     struct avec_config *conf,
+			     struct object_cipher_info *object,
+			     struct iovec *vec,
+			     int32_t vec_count);
+int32_t set_config_avec_hole(xlator_t *this,
+			     crypt_local_t *local,
+			     struct avec_config *conf,
+			     struct object_cipher_info *object,
+			     glusterfs_fop_t fop);
+void set_gap_at_end(call_frame_t *frame, struct object_cipher_info *object,
+		    struct avec_config *conf, atom_data_type dtype);
+void set_config_offsets(call_frame_t *frame,
+			xlator_t *this,
+			uint64_t offset,
+			uint64_t count,
+			atom_data_type dtype,
+			int32_t setup_gap_in_tail);
+
+/* metadata.c */
+extern struct crypt_mtd_loader mtd_loaders [LAST_MTD_LOADER];
+
+int32_t alloc_format(crypt_local_t *local, size_t size);
+int32_t alloc_format_create(crypt_local_t *local);
+void free_format(crypt_local_t *local);
+size_t format_size(mtd_op_t op, size_t old_size);
+size_t new_format_size(void);
+int32_t open_format(unsigned char *str, int32_t len, loc_t *loc,
+		    struct crypt_inode_info *info,
+		    struct master_cipher_info *master, crypt_local_t *local,
+		    gf_boolean_t load_info);
+int32_t update_format(unsigned char *new, unsigned char *old,
+		      size_t old_len, int32_t mac_idx, mtd_op_t op, loc_t *loc,
+		      struct crypt_inode_info *info,
+		      struct master_cipher_info *master,
+		      crypt_local_t *local);
+int32_t create_format(unsigned char *wire,
+		      loc_t *loc,
+		      struct crypt_inode_info *info,
+		      struct master_cipher_info *master);
+
+/* atom.c */
+struct rmw_atom *atom_by_types(atom_data_type data,
+			       atom_locality_type locality);
+void submit_partial(call_frame_t *frame,
+		    xlator_t *this,
+		    fd_t *fd,
+		    atom_locality_type ltype);
+void submit_full(call_frame_t *frame, xlator_t *this);
+
+/* crypt.c */
+
+end_writeback_handler_t dispatch_end_writeback(glusterfs_fop_t fop);
+static size_t iovec_get_size(struct iovec *vec, uint32_t count);
+void set_local_io_params_writev(call_frame_t *frame,
+				struct object_cipher_info *object,
+				struct rmw_atom *atom, off_t io_offset,
+				uint32_t io_size);
+void link_wind(call_frame_t *frame, xlator_t *this);
+void unlink_wind(call_frame_t *frame, xlator_t *this);
+void link_unwind(call_frame_t *frame);
+void unlink_unwind(call_frame_t *frame);
+void rename_wind(call_frame_t *frame, xlator_t *this);
+void rename_unwind(call_frame_t *frame);
+
+/* Inline functions */
+
+static inline size_t iovec_get_size(struct iovec *vec, uint32_t count)
+{
+	int i;
+	size_t size = 0;
+	for (i = 0; i < count; i++)
+		size += vec[i].iov_len;
+	return size;
+}
+
+static inline int32_t crypt_xlator_id(void)
+{
+	return CRYPT_XLATOR_ID;
+}
+
+static inline mtd_loader_id current_mtd_loader(void)
+{
+	return MTD_LOADER_V1;
+}
+
+static inline uint32_t master_key_size (void)
+{
+	return crypt_keys[MASTER_VOL_KEY].len >> 3;
+}
+
+static inline uint32_t nmtd_vol_key_size (void)
+{
+	return crypt_keys[NMTD_VOL_KEY].len >> 3;
+}
+
+static inline uint32_t alg_mode_blkbits(cipher_alg_t alg,
+					cipher_mode_t mode)
+{
+	return data_cipher_algs[alg][mode].blkbits;
+}
+
+static inline uint32_t alg_mode_blksize(cipher_alg_t alg,
+					cipher_mode_t mode)
+{
+	return 1 << alg_mode_blkbits(alg, mode);
+}
+
+static inline gf_boolean_t alg_mode_atomic(cipher_alg_t alg,
+					   cipher_mode_t mode)
+{
+	return data_cipher_algs[alg][mode].atomic;
+}
+
+static inline gf_boolean_t alg_mode_should_pad(cipher_alg_t alg,
+					       cipher_mode_t mode)
+{
+	return data_cipher_algs[alg][mode].should_pad;
+}
+
+static inline uint32_t master_alg_blksize(struct master_cipher_info *mr)
+{
+	return alg_mode_blksize(mr->m_alg, mr->m_mode);
+}
+
+static inline uint32_t master_alg_blkbits(struct master_cipher_info *mr)
+{
+	return alg_mode_blkbits(mr->m_alg, mr->m_mode);
+}
+
+static inline gf_boolean_t master_alg_atomic(struct master_cipher_info *mr)
+{
+	return alg_mode_atomic(mr->m_alg, mr->m_mode);
+}
+
+static inline gf_boolean_t master_alg_should_pad(struct master_cipher_info *mr)
+{
+	return alg_mode_should_pad(mr->m_alg, mr->m_mode);
+}
+
+static inline uint32_t object_alg_blksize(struct object_cipher_info *ob)
+{
+	return alg_mode_blksize(ob->o_alg, ob->o_mode);
+}
+
+static inline uint32_t object_alg_blkbits(struct object_cipher_info *ob)
+{
+	return alg_mode_blkbits(ob->o_alg, ob->o_mode);
+}
+
+static inline gf_boolean_t object_alg_atomic(struct object_cipher_info *ob)
+{
+	return alg_mode_atomic(ob->o_alg, ob->o_mode);
+}
+
+static inline gf_boolean_t object_alg_should_pad(struct object_cipher_info *ob)
+{
+	return alg_mode_should_pad(ob->o_alg, ob->o_mode);
+}
+
+static inline uint32_t aes_raw_key_size(struct master_cipher_info *master)
+{
+	return master->m_dkey_size >> 3;
+}
+
+static inline struct avec_config *get_hole_conf(call_frame_t *frame)
+{
+	return &(((crypt_local_t *)frame->local)->hole_conf);
+}
+
+static inline struct avec_config *get_data_conf(call_frame_t *frame)
+{
+	return &(((crypt_local_t *)frame->local)->data_conf);
+}
+
+static inline int32_t get_atom_bits (struct object_cipher_info *object)
+{
+	return object->o_block_bits;
+}
+
+static inline int32_t get_atom_size (struct object_cipher_info *object)
+{
+	return 1 << get_atom_bits(object);
+}
+
+static inline int32_t has_head_block(struct avec_config *conf)
+{
+	return conf->off_in_head ||
+		(conf->acount == 1 && conf->off_in_tail);
+}
+
+static inline int32_t has_tail_block(struct avec_config *conf)
+{
+	return conf->off_in_tail && conf->acount > 1;
+}
+
+static inline int32_t has_full_blocks(struct avec_config *conf)
+{
+	return conf->nr_full_blocks;
+}
+
+static inline int32_t should_submit_head_block(struct avec_config *conf)
+{
+	return has_head_block(conf) && (conf->cursor == 0);
+}
+
+static inline int32_t should_submit_tail_block(struct avec_config *conf)
+{
+	return has_tail_block(conf) && (conf->cursor == conf->acount - 1);
+}
+
+static inline int32_t should_submit_full_block(struct avec_config *conf)
+{
+	uint32_t start = has_head_block(conf) ? 1 : 0;
+
+	return has_full_blocks(conf) &&
+		conf->cursor >= start &&
+		conf->cursor < start + conf->nr_full_blocks;
+}
+
+#if DEBUG_CRYPT
+static inline void crypt_check_input_len(size_t len,
+					 struct object_cipher_info *object)
+{
+	if (object_alg_should_pad(object) && (len & (object_alg_blksize(object) - 1)))
+		gf_log ("crypt", GF_LOG_DEBUG, "bad input len: %d", (int)len);
+}
+
+static inline void check_head_block(struct avec_config *conf)
+{
+	if (!has_head_block(conf))
+		gf_log("crypt", GF_LOG_DEBUG, "not a head atom");
+}
+
+static inline void check_tail_block(struct avec_config *conf)
+{
+	if (!has_tail_block(conf))
+		gf_log("crypt", GF_LOG_DEBUG, "not a tail atom");
+}
+
+static inline void check_full_block(struct avec_config *conf)
+{
+	if (!has_full_blocks(conf))
+		gf_log("crypt", GF_LOG_DEBUG, "not a full atom");
+}
+
+static inline void check_cursor_head(struct avec_config *conf)
+{
+	if (!has_head_block(conf))
+		gf_log("crypt",
+		       GF_LOG_DEBUG, "Illegal call of head atom method");
+	else if (conf->cursor != 0)
+		gf_log("crypt",
+		       GF_LOG_DEBUG, "Cursor (%d) is not at head atom",
+		       conf->cursor);
+}
+
+static inline void check_cursor_full(struct avec_config *conf)
+{
+	if (!has_full_blocks(conf))
+		gf_log("crypt",
+		       GF_LOG_DEBUG, "Illegal call of full atom method");
+	if (has_head_block(conf) && (conf->cursor == 0))
+		gf_log("crypt",
+		       GF_LOG_DEBUG, "Cursor is not at full atom");
+}
+
+/*
+ * FIXME: use avec->iov_len to check setup
+ */
+static inline int data_local_invariant(crypt_local_t *local)
+{
+	return 0;
+}
+
+#else
+#define crypt_check_input_len(len, object) noop
+#define check_head_block(conf) noop
+#define check_tail_block(conf) noop
+#define check_full_block(conf) noop
+#define check_cursor_head(conf) noop
+#define check_cursor_full(conf) noop
+
+#endif /* DEBUG_CRYPT */
+
+static inline struct avec_config *conf_by_type(call_frame_t *frame,
+					       atom_data_type dtype)
+{
+	struct avec_config *conf = NULL;
+
+	switch (dtype) {
+	case HOLE_ATOM:
+		conf = get_hole_conf(frame);
+		break;
+	case DATA_ATOM:
+		conf = get_data_conf(frame);
+		break;
+	default:
+		gf_log("crypt", GF_LOG_DEBUG, "bad atom type");
+	}
+	return conf;
+}
+
+static inline uint32_t nr_calls_head(struct avec_config *conf)
+{
+	return has_head_block(conf) ? 1 : 0;
+}
+
+static inline uint32_t nr_calls_tail(struct avec_config *conf)
+{
+	return has_tail_block(conf) ? 1 : 0;
+}
+
+static inline uint32_t nr_calls_full(struct avec_config *conf)
+{
+	switch(conf->type) {
+	case HOLE_ATOM:
+		return has_full_blocks(conf);
+	case DATA_ATOM:
+		return has_full_blocks(conf) ?
+			logical_blocks_occupied(0,
+						conf->nr_full_blocks,
+						MAX_IOVEC_BITS)	: 0;
+	default:
+		gf_log("crypt", GF_LOG_DEBUG, "bad atom data type");
+		return 0;
+	}
+}
+
+static inline uint32_t nr_calls(struct avec_config *conf)
+{
+	return nr_calls_head(conf) + nr_calls_tail(conf) + nr_calls_full(conf);
+}
+
+static inline uint32_t nr_calls_data(call_frame_t *frame)
+{
+	return nr_calls(get_data_conf(frame));
+}
+
+static inline uint32_t nr_calls_hole(call_frame_t *frame)
+{
+	return nr_calls(get_hole_conf(frame));
+}
+
+static inline void get_one_call_nolock(call_frame_t *frame)
+{
+	crypt_local_t *local = frame->local;
+
+	++local->nr_calls;
+
+	//gf_log("crypt", GF_LOG_DEBUG, "get %d calls", 1);
+}
+
+static inline void get_one_call(call_frame_t *frame)
+{
+	crypt_local_t *local = frame->local;
+
+	LOCK(&local->call_lock);
+	get_one_call_nolock(frame);
+	UNLOCK(&local->call_lock);
+}
+
+static inline void get_nr_calls_nolock(call_frame_t *frame, int32_t nr)
+{
+	crypt_local_t *local = frame->local;
+
+	local->nr_calls += nr;
+
+	//gf_log("crypt", GF_LOG_DEBUG, "get %d calls", nr);
+}
+
+static inline void get_nr_calls(call_frame_t *frame, int32_t nr)
+{
+	crypt_local_t *local = frame->local;
+
+	LOCK(&local->call_lock);
+	get_nr_calls_nolock(frame, nr);
+	UNLOCK(&local->call_lock);
+}
+
+static inline int put_one_call(crypt_local_t *local)
+{
+	uint32_t last = 0;
+
+	LOCK(&local->call_lock);
+	if (--local->nr_calls == 0)
+		last = 1;
+
+	//gf_log("crypt", GF_LOG_DEBUG, "put %d calls", 1);
+
+	UNLOCK(&local->call_lock);
+	return last;
+}
+
+static inline int is_appended_write(call_frame_t *frame)
+{
+	crypt_local_t *local = frame->local;
+	struct avec_config *conf = get_data_conf(frame);
+
+	return conf->orig_offset + conf->orig_size > local->old_file_size;
+}
+
+static inline int is_ordered_mode(call_frame_t *frame)
+{
+#if 0
+	crypt_local_t *local = frame->local;
+	return local->fop == GF_FOP_FTRUNCATE ||
+		(local->fop == GF_FOP_WRITE && is_appended_write(frame));
+#endif
+	return 1;
+}
+
+static inline int32_t hole_conv_completed(crypt_local_t *local)
+{
+	struct avec_config *conf = &local->hole_conf;
+	return conf->cursor == conf->acount;
+}
+
+static inline int32_t data_write_in_progress(crypt_local_t *local)
+{
+	return local->active_setup == DATA_ATOM;
+}
+
+static inline int32_t parent_is_crypt_xlator(call_frame_t *frame,
+					     xlator_t *this)
+{
+	return frame->parent->this == this;
+}
+
+static inline linkop_wind_handler_t linkop_wind_dispatch(glusterfs_fop_t fop)
+{
+	switch(fop){
+	case GF_FOP_LINK:
+		return link_wind;
+	case GF_FOP_UNLINK:
+		return unlink_wind;
+	case GF_FOP_RENAME:
+		return rename_wind;
+	default:
+		gf_log("crypt", GF_LOG_ERROR, "Bad link operation %d", fop);
+		return NULL;
+	}
+}
+
+static inline linkop_unwind_handler_t linkop_unwind_dispatch(glusterfs_fop_t fop)
+{
+	switch(fop){
+	case GF_FOP_LINK:
+		return link_unwind;
+	case GF_FOP_UNLINK:
+		return unlink_unwind;
+	case GF_FOP_RENAME:
+		return rename_unwind;
+	default:
+		gf_log("crypt", GF_LOG_ERROR, "Bad link operation %d", fop);
+		return NULL;		
+	}	
+}
+
+static inline mtd_op_t linkop_mtdop_dispatch(glusterfs_fop_t fop)
+{
+	switch (fop) {
+	case GF_FOP_LINK:
+		return MTD_APPEND;
+	case GF_FOP_UNLINK:
+		return MTD_CUT;
+	case GF_FOP_RENAME:
+		return MTD_OVERWRITE;
+	default:
+		gf_log("crypt", GF_LOG_WARNING, "Bad link operation %d", fop);
+		return MTD_LAST_OP;
+	}
+}
+
+#endif /* __CRYPT_H__ */
+
+/*
+  Local variables:
+  c-indentation-style: "K&R"
+  mode-name: "LC"
+  c-basic-offset: 8
+  tab-width: 8
+  fill-column: 80
+  scroll-step: 1
+  End:
+*/
diff --git a/xlators/encryption/crypt/src/data.c b/xlators/encryption/crypt/src/data.c
new file mode 100644
index 000000000..762fa554a
--- /dev/null
+++ b/xlators/encryption/crypt/src/data.c
@@ -0,0 +1,769 @@
+/*
+  Copyright (c) 2008-2013 Red Hat, Inc. <http://www.redhat.com>
+  This file is part of GlusterFS.
+
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
+*/
+
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+
+#include "defaults.h"
+#include "crypt-common.h"
+#include "crypt.h"
+
+static void set_iv_aes_xts(off_t offset, struct object_cipher_info *object)
+{
+	unsigned char *ivec;
+
+	ivec = object->u.aes_xts.ivec;
+
+	/* convert the tweak into a little-endian byte
+	 * array (IEEE P1619/D16, May 2007, section 5.1)
+	 */
+
+	*((uint64_t *)ivec) = htole64(offset);
+
+	/* ivec is padded with zeroes */
+}
+
+static int32_t aes_set_keys_common(unsigned char *raw_key, uint32_t key_size,
+				   AES_KEY *keys)
+{
+	int32_t ret;
+
+	ret = AES_set_encrypt_key(raw_key,
+				  key_size,
+				  &keys[AES_ENCRYPT]);
+	if (ret) {
+		gf_log("crypt", GF_LOG_ERROR, "Set encrypt key failed");
+		return ret;
+	}
+	ret = AES_set_decrypt_key(raw_key,
+				  key_size,
+				  &keys[AES_DECRYPT]);
+	if (ret) {
+		gf_log("crypt", GF_LOG_ERROR, "Set decrypt key failed");
+		return ret;
+	}
+	return 0;
+}
+
+/*
+ * set private cipher info for xts mode
+ */
+static int32_t set_private_aes_xts(struct crypt_inode_info *info,
+				   struct master_cipher_info *master)
+{
+	int ret;
+	struct object_cipher_info *object = get_object_cinfo(info);
+	unsigned char *data_key;
+	uint32_t subkey_size;
+
+	/* init tweak value */
+	memset(object->u.aes_xts.ivec, 0, 16);
+
+	data_key = GF_CALLOC(1, object->o_dkey_size, gf_crypt_mt_key);
+	if (!data_key)
+		return ENOMEM;
+
+	/*
+	 * retrieve data keying meterial
+	 */
+	ret = get_data_file_key(info, master, object->o_dkey_size, data_key);
+	if (ret) {
+		gf_log("crypt", GF_LOG_ERROR, "Failed to retrieve data key");
+		GF_FREE(data_key);
+		return ret;
+	}
+	/*
+	 * parse compound xts key
+	 */
+	subkey_size = object->o_dkey_size >> 4; /* (xts-key-size-in-bytes / 2) */
+	/*
+	 * install key for data encryption
+	 */
+	ret = aes_set_keys_common(data_key,
+				  subkey_size << 3, object->u.aes_xts.dkey);
+	if (ret) {
+		GF_FREE(data_key);
+		return ret;
+	}
+	/*
+	 * set up key used to encrypt tweaks
+	 */
+	ret = AES_set_encrypt_key(data_key + subkey_size,
+				  object->o_dkey_size / 2,
+				  &object->u.aes_xts.tkey);
+	if (ret < 0)
+		gf_log("crypt", GF_LOG_ERROR, "Set tweak key failed");
+
+	GF_FREE(data_key);
+	return ret;
+}
+
+static int32_t aes_xts_init(void)
+{
+	cassert(AES_BLOCK_SIZE == (1 << AES_BLOCK_BITS));
+	return 0;
+}
+
+static int32_t check_key_aes_xts(uint32_t keysize)
+{
+	switch(keysize) {
+	case 256:
+	case 512:
+		return 0;
+	default:
+		break;
+	}
+	return -1;
+}
+
+static int32_t encrypt_aes_xts(const unsigned char *from,
+			       unsigned char *to, size_t length,
+			       off_t offset, const int enc,
+			       struct object_cipher_info *object)
+{
+	XTS128_CONTEXT ctx;
+	if (enc) {
+		ctx.key1 = &object->u.aes_xts.dkey[AES_ENCRYPT];
+		ctx.block1 = (block128_f)AES_encrypt;
+	}
+	else {
+		ctx.key1 = &object->u.aes_xts.dkey[AES_DECRYPT];
+		ctx.block1 = (block128_f)AES_decrypt;
+	}
+	ctx.key2 = &object->u.aes_xts.tkey;
+	ctx.block2 = (block128_f)AES_encrypt;
+
+	return CRYPTO_xts128_encrypt(&ctx,
+				     object->u.aes_xts.ivec,
+				     from,
+				     to,
+				     length, enc);
+}
+
+/*
+ * Cipher input chunk @from of length @len;
+ * @to: result of cipher transform;
+ * @off: offset in a file (must be cblock-aligned);
+ */
+static void cipher_data(struct object_cipher_info *object,
+			char *from,
+			char *to,
+			off_t off,
+			size_t len,
+			const int enc)
+{
+	crypt_check_input_len(len, object);
+
+#if TRIVIAL_TFM && DEBUG_CRYPT
+	return;
+#endif
+	data_cipher_algs[object->o_alg][object->o_mode].set_iv(off, object);
+	data_cipher_algs[object->o_alg][object->o_mode].encrypt
+		((const unsigned char *)from,
+		 (unsigned char *)to,
+		 len,
+		 off,
+		 enc,
+		 object);
+}
+
+#define MAX_CIPHER_CHUNK (1 << 30)
+
+/*
+ * Do cipher (encryption/decryption) transform of a
+ * continuous region of memory.
+ *
+ * @len: a number of bytes to transform;
+ * @buf: data to transform;
+ * @off: offset in a file, should be block-aligned
+ *       for atomic cipher modes and ksize-aligned
+ *       for other modes).
+ * @dir: direction of transform (encrypt/decrypt).
+ */
+static void cipher_region(struct object_cipher_info *object,
+			  char *from,
+			  char *to,
+			  off_t off,
+			  size_t len,
+			  int dir)
+{
+	while (len > 0) {
+		size_t to_cipher;
+
+		to_cipher = len;
+		if (to_cipher > MAX_CIPHER_CHUNK)
+			to_cipher = MAX_CIPHER_CHUNK;
+
+		/* this will reset IV */
+		cipher_data(object,
+			    from,
+			    to,
+			    off,
+			    to_cipher,
+			    dir);
+		from += to_cipher;
+		to   += to_cipher;
+		off  += to_cipher;
+		len  -= to_cipher;
+	}
+}
+
+/*
+ * Do cipher transform (encryption/decryption) of
+ * plaintext/ciphertext represented by @vec.
+ *
+ * Pre-conditions: @vec represents a continuous piece
+ * of data in a file at offset @off to be ciphered
+ * (encrypted/decrypted).
+ * @count is the number of vec's components. All the
+ * components must be block-aligned, the caller is
+ * responsible for this. @dir is "direction" of
+ * transform (encrypt/decrypt).
+ */
+static void cipher_aligned_iov(struct object_cipher_info *object,
+			       struct iovec *vec,
+			       int count,
+			       off_t off,
+			       int32_t dir)
+{
+	int i;
+	int len = 0;
+
+	for (i = 0; i < count; i++) {
+		cipher_region(object,
+			      vec[i].iov_base,
+			      vec[i].iov_base,
+			      off + len,
+			      vec[i].iov_len,
+			      dir);
+		len += vec[i].iov_len;
+	}
+}
+
+void encrypt_aligned_iov(struct object_cipher_info *object,
+			 struct iovec *vec,
+			 int count,
+			 off_t off)
+{
+	cipher_aligned_iov(object, vec, count, off, 1);
+}
+
+void decrypt_aligned_iov(struct object_cipher_info *object,
+			 struct iovec *vec,
+			 int count,
+			 off_t off)
+{
+	cipher_aligned_iov(object, vec, count, off, 0);
+}
+
+#if DEBUG_CRYPT
+static void compound_stream(struct iovec *vec, int count, char *buf, off_t skip)
+{
+	int i;
+	int off = 0;
+	for (i = 0; i < count; i++) {
+		memcpy(buf + off,
+		       vec[i].iov_base + skip,
+		       vec[i].iov_len - skip);
+
+		off += (vec[i].iov_len - skip);
+		skip = 0;
+	}
+}
+
+static void check_iovecs(struct iovec *vec, int cnt,
+			 struct iovec *avec, int acnt, uint32_t off_in_head)
+{
+	char *s1, *s2;
+	uint32_t size, asize;
+
+	size = iovec_get_size(vec, cnt);
+	asize = iovec_get_size(avec, acnt) - off_in_head;
+	if (size != asize) {
+		gf_log("crypt", GF_LOG_DEBUG, "size %d is not eq asize %d",
+		       size, asize);
+		return;
+	}
+	s1 = GF_CALLOC(1, size, gf_crypt_mt_data);
+	if (!s1) {
+		gf_log("crypt", GF_LOG_DEBUG, "Can not allocate stream ");
+		return;
+	}
+	s2 = GF_CALLOC(1, asize, gf_crypt_mt_data);
+	if (!s2) {
+		GF_FREE(s1);
+		gf_log("crypt", GF_LOG_DEBUG, "Can not allocate stream ");
+		return;
+	}
+	compound_stream(vec, cnt, s1, 0);
+	compound_stream(avec, acnt, s2, off_in_head);
+	if (memcmp(s1, s2, size))
+		gf_log("crypt", GF_LOG_DEBUG, "chunks of different data");
+	GF_FREE(s1);
+	GF_FREE(s2);
+}
+
+#else
+#define check_iovecs(vec, count, avec, avecn, off) noop
+#endif /* DEBUG_CRYPT */
+
+static char *data_alloc_block(xlator_t *this, crypt_local_t *local,
+			      int32_t block_size)
+{
+	struct iobuf *iobuf = NULL;
+
+	iobuf = iobuf_get2(this->ctx->iobuf_pool, block_size);
+	if (!iobuf) {
+		gf_log("crypt", GF_LOG_ERROR,
+		       "Failed to get iobuf");
+		return NULL;
+	}
+	if (!local->iobref_data) {
+		local->iobref_data = iobref_new();
+		if (!local->iobref_data) {
+			gf_log("crypt", GF_LOG_ERROR,
+			       "Failed to get iobref");
+			iobuf_unref(iobuf);
+			return NULL;
+		}
+	}
+	iobref_add(local->iobref_data, iobuf);
+	return iobuf->ptr;
+}
+
+/*
+ * Compound @avec, which represent the same data
+ * chunk as @vec, but has aligned components of
+ * specified block size. Alloc blocks, if needed.
+ * In particular, incomplete head and tail blocks
+ * must be allocated.
+ * Put number of allocated blocks to @num_blocks.
+ *
+ * Example:
+ *
+ * input: data chunk represented by 4 components
+ * [AB],[BC],[CD],[DE];
+ * output: 5 logical blocks (0, 1, 2, 3, 4).
+ *
+ *   A     B       C     D               E
+ *   *-----*+------*-+---*----+--------+-*
+ *   |     ||      | |   |    |        | |
+ * *-+-----+*------+-*---+----*--------*-+------*
+ * 0        1        2        3        4
+ *
+ * 0 - incomplete compound (head);
+ * 1, 2 - full compound;
+ * 3 - full non-compound (the case of reuse);
+ * 4 - incomplete non-compound (tail).
+ */
+int32_t align_iov_by_atoms(xlator_t *this,
+			   crypt_local_t *local,
+			   struct object_cipher_info *object,
+			   struct iovec *vec /* input vector */,
+			   int32_t count /* number of vec components */,
+			   struct iovec *avec /* aligned vector */,
+			   char **blocks /* pool of blocks */,
+			   uint32_t *blocks_allocated,
+			   struct avec_config *conf)
+{
+	int vecn = 0;      /* number of the current component in vec */
+	int avecn = 0;     /* number of the current component in avec */
+	off_t vec_off = 0; /* offset in the current vec component,
+			    * i.e. the number of bytes have already
+			    * been copied */
+	int32_t block_size = get_atom_size(object);
+	size_t to_process; /* number of vec's bytes to copy and(or) re-use */
+	int32_t off_in_head = conf->off_in_head;
+
+	to_process = iovec_get_size(vec, count);
+
+	while (to_process > 0) {
+		if (off_in_head ||
+		    vec[vecn].iov_len - vec_off < block_size) {
+			/*
+			 * less than block_size:
+			 * the case of incomplete (head or tail),
+			 * or compound block
+			 */
+			size_t copied = 0;
+			/*
+			 * populate the pool with a new block
+			 */
+			blocks[*blocks_allocated] = data_alloc_block(this,
+								    local,
+								    block_size);
+			if (!blocks[*blocks_allocated])
+				return -ENOMEM;
+			memset(blocks[*blocks_allocated], 0, off_in_head);
+			/*
+			 * fill the block with vec components
+			 */
+			do {
+				size_t to_copy;
+
+				to_copy = vec[vecn].iov_len - vec_off;
+				if (to_copy > block_size - off_in_head)
+					to_copy = block_size - off_in_head;
+
+				memcpy(blocks[*blocks_allocated] + off_in_head + copied,
+				       vec[vecn].iov_base + vec_off,
+				       to_copy);
+
+				copied += to_copy;
+				to_process -= to_copy;
+
+				vec_off += to_copy;
+				if (vec_off == vec[vecn].iov_len) {
+					/* finished with this vecn */
+					vec_off = 0;
+					vecn++;
+				}
+			} while (copied < (block_size - off_in_head) && to_process > 0);
+			/*
+			 * update avec
+			 */
+			avec[avecn].iov_len = off_in_head + copied;
+			avec[avecn].iov_base = blocks[*blocks_allocated];
+
+			(*blocks_allocated)++;
+			off_in_head = 0;
+		} else {
+			/*
+			 * the rest of the current vec component
+			 * is not less than block_size, so reuse
+			 * the memory buffer of the component.
+			 */
+			size_t to_reuse;
+			to_reuse = (to_process > block_size ?
+				    block_size :
+				    to_process);
+			avec[avecn].iov_len = to_reuse;
+			avec[avecn].iov_base = vec[vecn].iov_base + vec_off;
+
+			vec_off += to_reuse;
+			if (vec_off == vec[vecn].iov_len) {
+				/* finished with this vecn */
+				vec_off = 0;
+				vecn++;
+			}
+			to_process -= to_reuse;
+		}
+		avecn++;
+	}
+	check_iovecs(vec, count, avec, avecn, conf->off_in_head);
+	return 0;
+}
+
+/*
+ * allocate and setup aligned vector for data submission
+ * Pre-condition: @conf is set.
+ */
+int32_t set_config_avec_data(xlator_t *this,
+			     crypt_local_t *local,
+			     struct avec_config *conf,
+			     struct object_cipher_info *object,
+			     struct iovec *vec,
+			     int32_t vec_count)
+{
+	int32_t ret = ENOMEM;
+	struct iovec *avec;
+	char **pool;
+	uint32_t blocks_in_pool = 0;
+
+	conf->type = DATA_ATOM;
+
+	avec = GF_CALLOC(conf->acount, sizeof(*avec), gf_crypt_mt_iovec);
+	if (!avec)
+		return ret;
+	pool = GF_CALLOC(conf->acount, sizeof(pool), gf_crypt_mt_char);
+	if (!pool) {
+		GF_FREE(avec);
+		return ret;
+	}
+	if (!vec) {
+		/*
+		 * degenerated case: no data
+		 */
+		pool[0] = data_alloc_block(this, local, get_atom_size(object));
+		if (!pool[0])
+			goto free;
+		blocks_in_pool = 1;
+		avec->iov_base = pool[0];
+		avec->iov_len = conf->off_in_tail;
+	}
+	else {
+		ret = align_iov_by_atoms(this, local, object, vec, vec_count,
+					 avec, pool, &blocks_in_pool, conf);
+		if (ret)
+			goto free;
+	}
+	conf->avec = avec;
+	conf->pool = pool;
+	conf->blocks_in_pool = blocks_in_pool;
+	return 0;
+ free:
+	GF_FREE(avec);
+	GF_FREE(pool);
+	return ret;
+}
+
+/*
+ * allocate and setup aligned vector for hole submission
+ */
+int32_t set_config_avec_hole(xlator_t *this,
+			     crypt_local_t *local,
+			     struct avec_config *conf,
+			     struct object_cipher_info *object,
+			     glusterfs_fop_t fop)
+{
+	uint32_t i, idx;
+	struct iovec *avec;
+	char **pool;
+	uint32_t num_blocks;
+	uint32_t blocks_in_pool = 0;
+
+	conf->type = HOLE_ATOM;
+
+	num_blocks = conf->acount -
+		(conf->nr_full_blocks ? conf->nr_full_blocks - 1 : 0);
+
+	switch (fop) {
+	case GF_FOP_WRITE:
+		/*
+		 * hole goes before data
+		 */
+		if (num_blocks == 1 && conf->off_in_tail != 0)
+		/*
+		 * we won't submit a hole which fits into
+		 * a data atom: this part of hole will be
+		 * submitted with data write
+		 */
+			return 0;
+		break;
+	case GF_FOP_FTRUNCATE:
+		/*
+		 * expanding truncate, hole goes after data,
+		 * and will be submited in any case.
+ 		 */
+		break;
+	default:
+		gf_log("crypt", GF_LOG_WARNING,
+		       "bad file operation %d", fop);
+		return 0;
+	}
+	avec = GF_CALLOC(num_blocks, sizeof(*avec), gf_crypt_mt_iovec);
+	if (!avec)
+		return ENOMEM;
+	pool = GF_CALLOC(num_blocks, sizeof(pool), gf_crypt_mt_char);
+	if (!pool) {
+		GF_FREE(avec);
+		return ENOMEM;
+	}
+	for (i = 0; i < num_blocks; i++) {
+		pool[i] = data_alloc_block(this, local, get_atom_size(object));
+		if (pool[i] == NULL)
+			goto free;
+		blocks_in_pool++;
+	}
+	if (has_head_block(conf)) {
+		/* set head block */
+		idx = 0;
+		avec[idx].iov_base = pool[idx];
+		avec[idx].iov_len = get_atom_size(object);
+		memset(avec[idx].iov_base + conf->off_in_head,
+		       0,
+		       get_atom_size(object) - conf->off_in_head);
+	}
+	if (has_tail_block(conf)) {
+		/* set tail block */
+		idx = num_blocks - 1;
+		avec[idx].iov_base = pool[idx];
+		avec[idx].iov_len = get_atom_size(object);
+		memset(avec[idx].iov_base, 0, conf->off_in_tail);
+	}
+	if (has_full_blocks(conf)) {
+		/* set full block */
+		idx = conf->off_in_head ? 1 : 0;
+		avec[idx].iov_base = pool[idx];
+		avec[idx].iov_len = get_atom_size(object);
+		/*
+		 * since we re-use the buffer,
+		 * zeroes will be set every time
+		 * before encryption, see submit_full()
+		 */
+	}
+	conf->avec = avec;
+	conf->pool = pool;
+	conf->blocks_in_pool = blocks_in_pool;
+	return 0;
+ free:
+	GF_FREE(avec);
+	GF_FREE(pool);
+	return ENOMEM;
+}
+
+/* A helper for setting up config of partial atoms (which
+ * participate in read-modify-write sequence).
+ *
+ * Calculate and setup precise amount of "extra-bytes"
+ * that should be uptodated at the end of partial (not
+ * necessarily tail!) block.
+ *
+ * Pre-condition: local->old_file_size is valid!
+ * @conf contains setup, which is enough for correct calculation
+ * of has_tail_block(), ->get_offset().
+ */
+void set_gap_at_end(call_frame_t *frame, struct object_cipher_info *object,
+		    struct avec_config *conf, atom_data_type dtype)
+{
+	uint32_t to_block;
+	crypt_local_t *local = frame->local;
+	uint64_t old_file_size = local->old_file_size;
+	struct rmw_atom *partial = atom_by_types(dtype,
+						 has_tail_block(conf) ?
+						 TAIL_ATOM : HEAD_ATOM);
+
+	if (old_file_size <= partial->offset_at(frame, object))
+		to_block = 0;
+	else {
+		to_block = old_file_size - partial->offset_at(frame, object);
+		if (to_block > get_atom_size(object))
+			to_block = get_atom_size(object);
+	}
+	if (to_block > conf->off_in_tail)
+		conf->gap_in_tail = to_block - conf->off_in_tail;
+	else
+		/*
+		 * nothing to uptodate
+		 */
+		conf->gap_in_tail = 0;
+}
+
+/*
+ * fill struct avec_config with offsets layouts
+ */
+void set_config_offsets(call_frame_t *frame,
+			xlator_t *this,
+			uint64_t offset,
+			uint64_t count,
+			atom_data_type dtype,
+			int32_t set_gap)
+{
+	crypt_local_t *local;
+	struct object_cipher_info *object;
+	struct avec_config *conf;
+	uint32_t resid;
+
+	uint32_t atom_size;
+	uint32_t atom_bits;
+
+	size_t orig_size;
+	off_t orig_offset;
+	size_t expanded_size;
+	off_t aligned_offset;
+
+	uint32_t off_in_head = 0;
+	uint32_t off_in_tail = 0;
+	uint32_t nr_full_blocks;
+	int32_t size_full_blocks;
+
+	uint32_t acount; /* number of alifned components to write.
+			  * The same as number of occupied logical
+			  * blocks (atoms)
+			  */
+	local = frame->local;
+	object = &local->info->cinfo;
+	conf = (dtype == DATA_ATOM ?
+		get_data_conf(frame) : get_hole_conf(frame));
+
+	orig_offset = offset;
+	orig_size = count;
+
+	atom_size = get_atom_size(object);
+	atom_bits = get_atom_bits(object);
+
+	/*
+	 * Round-down the start,
+	 * round-up the end.
+	 */
+	resid = offset & (uint64_t)(atom_size - 1);
+
+	if (resid)
+		off_in_head = resid;
+	aligned_offset = offset - off_in_head;
+	expanded_size = orig_size + off_in_head;
+
+	/* calculate tail,
+	   expand size forward  */
+	resid = (offset + orig_size) & (uint64_t)(atom_size - 1);
+
+	if (resid) {
+		off_in_tail = resid;
+		expanded_size += (atom_size - off_in_tail);
+	}
+	/*
+	 * calculate number of occupied blocks
+	 */
+	acount = expanded_size >> atom_bits;
+	/*
+	 * calculate number of full blocks
+	 */
+	size_full_blocks = expanded_size;
+	if (off_in_head)
+		size_full_blocks -= atom_size;
+	if (off_in_tail && size_full_blocks > 0)
+		size_full_blocks -= atom_size;
+	nr_full_blocks = size_full_blocks >> atom_bits;
+
+	conf->atom_size = atom_size;
+	conf->orig_size = orig_size;
+	conf->orig_offset = orig_offset;
+	conf->expanded_size = expanded_size;
+	conf->aligned_offset = aligned_offset;
+
+	conf->off_in_head = off_in_head;
+	conf->off_in_tail = off_in_tail;
+	conf->nr_full_blocks = nr_full_blocks;
+	conf->acount = acount;
+	/*
+	 * Finally, calculate precise amount of
+	 * "extra-bytes" that should be uptodated
+	 * at the end.
+	 * Only if RMW is expected.
+	 */
+	if (off_in_tail && set_gap)
+		set_gap_at_end(frame, object, conf, dtype);
+}
+
+struct data_cipher_alg data_cipher_algs[LAST_CIPHER_ALG][LAST_CIPHER_MODE] = {
+	[AES_CIPHER_ALG][XTS_CIPHER_MODE] =
+	{ .atomic = _gf_true,
+	  .should_pad = _gf_true,
+	  .blkbits = AES_BLOCK_BITS,
+	  .init = aes_xts_init,
+	  .set_private = set_private_aes_xts,
+	  .check_key = check_key_aes_xts,
+	  .set_iv = set_iv_aes_xts,
+	  .encrypt = encrypt_aes_xts
+	}
+};
+
+/*
+  Local variables:
+  c-indentation-style: "K&R"
+  mode-name: "LC"
+  c-basic-offset: 8
+  tab-width: 8
+  fill-column: 80
+  scroll-step: 1
+  End:
+*/
diff --git a/xlators/encryption/crypt/src/keys.c b/xlators/encryption/crypt/src/keys.c
new file mode 100644
index 000000000..4a1d3bb5a
--- /dev/null
+++ b/xlators/encryption/crypt/src/keys.c
@@ -0,0 +1,302 @@
+/*
+  Copyright (c) 2008-2013 Red Hat, Inc. <http://www.redhat.com>
+  This file is part of GlusterFS.
+
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
+*/
+
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+
+#include "defaults.h"
+#include "crypt-common.h"
+#include "crypt.h"
+
+/* Key hierarchy
+                  
+                   +----------------+
+                   | MASTER_VOL_KEY |
+                   +-------+--------+
+                           |
+                           |
+          +----------------+----------------+
+          |                |                |
+          |                |                |
+  +-------+------+ +-------+-------+ +------+--------+
+  | NMTD_VOL_KEY | | EMTD_FILE_KEY | | DATA_FILE_KEY |
+  +-------+------+ +---------------+ +---------------+
+          |
+          |
+  +-------+-------+
+  | NMTD_LINK_KEY |
+  +---------------+
+
+ */
+
+#if DEBUG_CRYPT
+static void check_prf_iters(uint32_t num_iters)
+{
+	if (num_iters == 0)
+		gf_log ("crypt", GF_LOG_DEBUG,
+			"bad number of prf iterations : %d", num_iters);
+}
+#else
+#define check_prf_iters(num_iters) noop
+#endif /* DEBUG_CRYPT */
+
+unsigned char crypt_fake_oid[16] =
+	{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
+
+/*
+ * derive key in the counter mode using
+ * sha256-based HMAC as PRF, see
+ * NIST Special Publication 800-108, 5.1)
+ */
+
+#define PRF_OUTPUT_SIZE  SHA256_DIGEST_LENGTH
+
+static int32_t kderive_init(struct kderive_context *ctx,
+			    const unsigned char *pkey, /* parent key */
+			    uint32_t pkey_size,  /* parent key size */
+			    const unsigned char *idctx, /* id-context */
+			    uint32_t idctx_size,
+			    crypt_key_type type  /* type of child key */)
+{
+	unsigned char *pos;
+	uint32_t llen = strlen(crypt_keys[type].label);	
+	/*
+	 * Compoud the fixed input data for KDF:
+	 * [i]_2 || Label || 0x00 || Id-Context || [L]_2),
+	 * NIST SP 800-108, 5.1
+	 */
+	ctx->fid_len =
+		sizeof(uint32_t) +
+		llen +
+		1 +
+		idctx_size +
+		sizeof(uint32_t);
+
+	ctx->fid = GF_CALLOC(ctx->fid_len, 1, gf_crypt_mt_key);
+	if (!ctx->fid)
+		return ENOMEM;
+	ctx->out_len = round_up(crypt_keys[type].len >> 3,
+				PRF_OUTPUT_SIZE);
+	ctx->out = GF_CALLOC(ctx->out_len, 1, gf_crypt_mt_key);
+	if (!ctx->out) {
+		GF_FREE(ctx->fid);
+		return ENOMEM;
+	}
+	ctx->pkey = pkey;
+	ctx->pkey_len = pkey_size;
+	ctx->ckey_len = crypt_keys[type].len;
+
+	pos = ctx->fid;
+
+	/* counter will be set up in kderive_rfn() */
+	pos += sizeof(uint32_t);
+
+	memcpy(pos, crypt_keys[type].label, llen);
+	pos += llen;
+
+	/* set up zero octet */
+	*pos = 0;
+	pos += 1;
+
+	memcpy(pos, idctx, idctx_size);
+	pos += idctx_size;
+
+	*((uint32_t *)pos) = htobe32(ctx->ckey_len);
+
+	return 0;
+}
+
+static void kderive_update(struct kderive_context *ctx)
+{	
+	uint32_t i;
+	HMAC_CTX hctx;
+	unsigned char *pos = ctx->out;
+	uint32_t *p_iter = (uint32_t *)ctx->fid;
+	uint32_t num_iters = ctx->out_len / PRF_OUTPUT_SIZE;
+
+	check_prf_iters(num_iters);
+
+	HMAC_CTX_init(&hctx);
+	for (i = 0; i < num_iters; i++) {
+		/*
+		 * update the iteration number in the fid
+		 */
+		*p_iter = htobe32(i);
+		HMAC_Init_ex(&hctx,
+			     ctx->pkey, ctx->pkey_len >> 3,
+			     EVP_sha256(),
+			     NULL);
+		HMAC_Update(&hctx, ctx->fid, ctx->fid_len);
+		HMAC_Final(&hctx, pos, NULL);
+
+		pos += PRF_OUTPUT_SIZE;
+	}
+	HMAC_CTX_cleanup(&hctx);
+}
+
+static void kderive_final(struct kderive_context *ctx, unsigned char *child)
+{
+	memcpy(child, ctx->out, ctx->ckey_len >> 3);
+	GF_FREE(ctx->fid);
+	GF_FREE(ctx->out);
+	memset(ctx, 0, sizeof(*ctx));
+}
+
+/*
+ * derive per-volume key for object ids aithentication
+ */
+int32_t get_nmtd_vol_key(struct master_cipher_info *master)
+{
+	int32_t ret;
+	struct kderive_context ctx;
+
+	ret = kderive_init(&ctx,
+			   master->m_key,
+			   master_key_size(),
+			   crypt_fake_oid, sizeof(uuid_t), NMTD_VOL_KEY);
+	if (ret)
+		return ret;
+	kderive_update(&ctx);
+	kderive_final(&ctx, master->m_nmtd_key);
+	return 0;
+}
+
+/*
+ * derive per-link key for aithentication of non-encrypted
+ * meta-data (nmtd)
+ */
+int32_t get_nmtd_link_key(loc_t *loc,
+			  struct master_cipher_info *master,
+			  unsigned char *result)
+{
+	int32_t ret;
+	struct kderive_context ctx;
+
+	ret = kderive_init(&ctx,
+			   master->m_nmtd_key,
+			   nmtd_vol_key_size(),
+			   (const unsigned char *)loc->path,
+			   strlen(loc->path), NMTD_LINK_KEY);
+	if (ret)
+		return ret;
+	kderive_update(&ctx);
+	kderive_final(&ctx, result);
+	return 0;
+}
+
+/*
+ * derive per-file key for encryption and authentication
+ * of encrypted part of metadata (emtd)
+ */
+int32_t get_emtd_file_key(struct crypt_inode_info *info,
+			  struct master_cipher_info *master,
+			  unsigned char *result)
+{
+	int32_t ret;
+	struct kderive_context ctx;
+
+	ret = kderive_init(&ctx,
+			   master->m_key,
+			   master_key_size(),
+			   info->oid, sizeof(uuid_t), EMTD_FILE_KEY);
+	if (ret)
+		return ret;
+	kderive_update(&ctx);
+	kderive_final(&ctx, result);
+	return 0;
+}
+
+static int32_t data_key_type_by_size(uint32_t keysize, crypt_key_type *type)
+{
+	int32_t ret = 0;
+	switch (keysize) {
+	case 256:
+		*type = DATA_FILE_KEY_256;
+		break;
+	case 512:
+		*type = DATA_FILE_KEY_512;
+		break;
+	default:
+		gf_log("crypt", GF_LOG_ERROR, "Unsupported data key size %d",
+		       keysize);
+		ret = ENOTSUP;
+		break;
+	}
+	return ret;
+}
+
+/*
+ * derive per-file key for data encryption
+ */
+int32_t get_data_file_key(struct crypt_inode_info *info,
+			  struct master_cipher_info *master,
+			  uint32_t keysize,
+			  unsigned char *key)
+{
+	int32_t ret;
+	struct kderive_context ctx;
+	crypt_key_type type;
+
+	ret = data_key_type_by_size(keysize, &type);
+	if (ret)
+		return ret;
+	ret = kderive_init(&ctx,
+			   master->m_key,
+			   master_key_size(),
+			   info->oid, sizeof(uuid_t), type);
+	if (ret)
+		return ret;
+	kderive_update(&ctx);
+	kderive_final(&ctx, key);
+	return 0;
+}
+
+/*
+ * NOTE: Don't change existing keys: it will break compatibility;
+ */
+struct crypt_key crypt_keys[LAST_KEY_TYPE] = {
+	[MASTER_VOL_KEY] =
+	{ .len = MASTER_VOL_KEY_SIZE << 3,
+	  .label = "volume-master",
+	},
+	[NMTD_VOL_KEY] =
+	{ .len = NMTD_VOL_KEY_SIZE << 3,
+	  .label = "volume-nmtd-key-generation"
+	},
+	[NMTD_LINK_KEY] =
+	{ .len = 128,
+	  .label = "link-nmtd-authentication"
+	},
+	[EMTD_FILE_KEY] =
+	{ .len = 128,
+	  .label = "file-emtd-encryption-and-auth"
+	},
+	[DATA_FILE_KEY_256] =
+	{ .len = 256,
+	  .label = "file-data-encryption-256"
+	},
+	[DATA_FILE_KEY_512] =
+	{ .len = 512,
+	  .label = "file-data-encryption-512"
+	}
+};
+
+/*
+  Local variables:
+  c-indentation-style: "K&R"
+  mode-name: "LC"
+  c-basic-offset: 8
+  tab-width: 8
+  fill-column: 80
+  scroll-step: 1
+  End:
+*/
diff --git a/xlators/encryption/crypt/src/metadata.c b/xlators/encryption/crypt/src/metadata.c
new file mode 100644
index 000000000..36b14c055
--- /dev/null
+++ b/xlators/encryption/crypt/src/metadata.c
@@ -0,0 +1,605 @@
+/*
+  Copyright (c) 2008-2012 Red Hat, Inc. <http://www.redhat.com>
+  This file is part of GlusterFS.
+
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
+*/
+
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+
+#include "defaults.h"
+#include "crypt-common.h"
+#include "crypt.h"
+#include "metadata.h"
+
+int32_t alloc_format(crypt_local_t *local, size_t size)
+{
+	if (size > 0) {
+		local->format = GF_CALLOC(1, size, gf_crypt_mt_mtd);
+		if (!local->format)
+			return ENOMEM;
+	}
+	local->format_size = size;
+	return 0;
+}
+
+int32_t alloc_format_create(crypt_local_t *local)
+{
+	return alloc_format(local, new_format_size());
+}
+
+void free_format(crypt_local_t *local)
+{
+	GF_FREE(local->format);
+}
+
+/*
+ * Check compatibility with extracted metadata
+ */
+static int32_t check_file_metadata(struct crypt_inode_info *info)
+{
+	struct object_cipher_info *object = &info->cinfo;
+
+	if (info->nr_minor != CRYPT_XLATOR_ID) {
+		gf_log("crypt", GF_LOG_WARNING,
+		       "unsupported minor subversion %d", info->nr_minor);
+		return EINVAL;
+	}
+	if (object->o_alg > LAST_CIPHER_ALG) {
+		gf_log("crypt", GF_LOG_WARNING,
+		       "unsupported cipher algorithm %d",
+		       object->o_alg);
+		return EINVAL;
+	}
+	if (object->o_mode > LAST_CIPHER_MODE) {
+		gf_log("crypt", GF_LOG_WARNING,
+		       "unsupported cipher mode %d",
+		       object->o_mode);
+		return EINVAL;
+	}
+	if (object->o_block_bits < CRYPT_MIN_BLOCK_BITS ||
+	    object->o_block_bits > CRYPT_MAX_BLOCK_BITS) {
+		gf_log("crypt", GF_LOG_WARNING, "unsupported block bits %d",
+		       object->o_block_bits);
+		return EINVAL;
+	}
+	/* TBD: check data key size */
+	return 0;
+}
+
+static size_t format_size_v1(mtd_op_t op, size_t old_size)
+{
+	
+	switch (op) {
+	case MTD_CREATE:
+		return sizeof(struct mtd_format_v1);
+	case MTD_OVERWRITE:
+		return old_size;
+	case MTD_APPEND:
+		return old_size + NMTD_8_MAC_SIZE;
+	case MTD_CUT:
+		if (old_size > sizeof(struct mtd_format_v1))
+			return old_size - NMTD_8_MAC_SIZE;
+		else
+			return 0;
+	default:
+		gf_log("crypt", GF_LOG_WARNING, "Bad mtd operation");
+		return 0;
+	}
+}
+
+/*
+ * Calculate size of the updated format string.
+ * Returned zero means that we don't need to update the format string.
+ */
+size_t format_size(mtd_op_t op, size_t old_size)
+{
+	size_t versioned;
+
+	versioned = mtd_loaders[current_mtd_loader()].format_size(op,
+				 old_size - sizeof(struct crypt_format));
+	if (versioned != 0)
+		return versioned + sizeof(struct crypt_format);
+	return 0;
+}
+
+/*
+ * size of the format string of newly created file (nr_links = 1)
+ */
+size_t new_format_size(void)
+{
+	return format_size(MTD_CREATE, 0);
+}
+
+/*
+ * Calculate per-link MAC by pathname
+ */
+static int32_t calc_link_mac_v1(struct mtd_format_v1 *fmt,
+				loc_t *loc,
+				unsigned char *result,
+				struct crypt_inode_info *info,
+				struct master_cipher_info *master)
+{
+	int32_t ret;	
+	unsigned char nmtd_link_key[16];
+	CMAC_CTX *cctx;
+	size_t len;
+
+	ret = get_nmtd_link_key(loc, master, nmtd_link_key);
+	if (ret) {
+		gf_log("crypt", GF_LOG_ERROR, "Can not get nmtd link key");
+		return -1;
+	}
+	cctx = CMAC_CTX_new();
+	if (!cctx) {
+		gf_log("crypt", GF_LOG_ERROR, "CMAC_CTX_new failed");
+		return -1; 
+	}
+	ret = CMAC_Init(cctx, nmtd_link_key, sizeof(nmtd_link_key),
+			EVP_aes_128_cbc(), 0);
+	if (!ret) {
+		gf_log("crypt", GF_LOG_ERROR, "CMAC_Init failed");
+		CMAC_CTX_free(cctx);
+		return -1;
+	}
+	ret = CMAC_Update(cctx, get_NMTD_V1(info), SIZE_OF_NMTD_V1);
+	if (!ret) {
+		gf_log("crypt", GF_LOG_ERROR, "CMAC_Update failed");
+		CMAC_CTX_free(cctx);
+		return -1;
+	}
+	ret = CMAC_Final(cctx, result, &len);
+	CMAC_CTX_free(cctx);
+	if (!ret) {
+		gf_log("crypt", GF_LOG_ERROR, "CMAC_Final failed");
+		return -1;
+	}
+	return 0;
+}
+
+/*
+ * Create per-link MAC of index @idx by pathname
+ */
+static int32_t create_link_mac_v1(struct mtd_format_v1 *fmt,
+				  uint32_t idx,
+				  loc_t *loc,
+				  struct crypt_inode_info *info,
+				  struct master_cipher_info *master)
+{
+	int32_t ret;
+	unsigned char *mac;
+	unsigned char cmac[16];
+
+	mac = get_NMTD_V1_MAC(fmt) + idx * SIZE_OF_NMTD_V1_MAC;
+
+	ret = calc_link_mac_v1(fmt, loc, cmac, info, master);
+	if (ret)
+		return -1;
+	memcpy(mac, cmac, SIZE_OF_NMTD_V1_MAC);
+	return 0;
+}
+
+static int32_t create_format_v1(unsigned char *wire,
+				loc_t *loc,
+				struct crypt_inode_info *info,
+				struct master_cipher_info *master)
+{
+	int32_t ret;
+	struct mtd_format_v1 *fmt;
+	unsigned char mtd_key[16];
+	AES_KEY EMTD_KEY;
+	unsigned char nmtd_link_key[16];
+	uint32_t ad;
+	GCM128_CONTEXT *gctx;
+
+	fmt = (struct mtd_format_v1 *)wire;
+
+	fmt->minor_id = info->nr_minor;
+	fmt->alg_id = AES_CIPHER_ALG;
+	fmt->dkey_factor = master->m_dkey_size >> KEY_FACTOR_BITS;
+	fmt->block_bits = master->m_block_bits;
+	fmt->mode_id = master->m_mode;
+	/*
+	 * retrieve keys for the parts of metadata
+	 */
+	ret = get_emtd_file_key(info, master, mtd_key);
+	if (ret)
+		return ret;
+	ret = get_nmtd_link_key(loc, master, nmtd_link_key);
+	if (ret)
+		return ret;
+	
+	AES_set_encrypt_key(mtd_key, sizeof(mtd_key)*8, &EMTD_KEY);
+
+	gctx = CRYPTO_gcm128_new(&EMTD_KEY, (block128_f)AES_encrypt);
+
+	/* TBD: Check return values */
+
+	CRYPTO_gcm128_setiv(gctx, info->oid, sizeof(uuid_t));
+
+	ad = htole32(MTD_LOADER_V1);
+	ret = CRYPTO_gcm128_aad(gctx, (const unsigned char *)&ad, sizeof(ad));
+	if (ret) {
+		gf_log("crypt", GF_LOG_ERROR, " CRYPTO_gcm128_aad failed");
+		CRYPTO_gcm128_release(gctx);
+		return ret;
+	}
+	ret = CRYPTO_gcm128_encrypt(gctx,
+				    get_EMTD_V1(fmt),
+				    get_EMTD_V1(fmt),
+				    SIZE_OF_EMTD_V1);
+	if (ret) {
+		gf_log("crypt", GF_LOG_ERROR, " CRYPTO_gcm128_encrypt failed");
+		CRYPTO_gcm128_release(gctx);
+		return ret;
+	}
+	/*
+	 * set MAC of encrypted part of metadata
+	 */
+	CRYPTO_gcm128_tag(gctx, get_EMTD_V1_MAC(fmt), SIZE_OF_EMTD_V1_MAC);
+	CRYPTO_gcm128_release(gctx);
+	/*
+	 * set the first MAC of non-encrypted part of metadata 
+	 */
+	return create_link_mac_v1(fmt, 0, loc, info, master);
+}
+
+/*
+ * Called by fops:
+ * ->create();
+ * ->link();
+ *
+ * Pack common and version-specific parts of file's metadata
+ * Pre-conditions: @info contains valid object-id.
+ */
+int32_t create_format(unsigned char *wire,
+		      loc_t *loc,
+		      struct crypt_inode_info *info,
+		      struct master_cipher_info *master)
+{
+	struct crypt_format *fmt = (struct crypt_format *)wire;
+
+	fmt->loader_id = current_mtd_loader();
+
+	wire += sizeof(struct crypt_format);
+	return mtd_loaders[current_mtd_loader()].create_format(wire, loc,
+							       info, master);
+}
+
+/*
+ * Append or overwrite per-link mac of @mac_idx index
+ * in accordance with the new pathname
+ */
+int32_t appov_link_mac_v1(unsigned char *new,
+			  unsigned char *old,
+			  uint32_t old_size,
+			  int32_t mac_idx,
+			  loc_t *loc,
+			  struct crypt_inode_info *info,
+			  struct master_cipher_info *master,
+			  crypt_local_t *local)
+{
+	memcpy(new, old, old_size);
+	return create_link_mac_v1((struct mtd_format_v1 *)new, mac_idx,
+				  loc, info, master);
+}
+
+/*
+ * Cut per-link mac of @mac_idx index
+ */
+static int32_t cut_link_mac_v1(unsigned char *new,
+			       unsigned char *old,			       
+			       uint32_t old_size,
+			       int32_t mac_idx,
+			       loc_t *loc,
+			       struct crypt_inode_info *info,
+			       struct master_cipher_info *master,
+			       crypt_local_t *local)
+{
+	memcpy(new,
+	       old,
+	       sizeof(struct mtd_format_v1) + NMTD_8_MAC_SIZE * (mac_idx - 1));
+
+	memcpy(new + sizeof(struct mtd_format_v1) + NMTD_8_MAC_SIZE * (mac_idx - 1),
+	       old + sizeof(struct mtd_format_v1) + NMTD_8_MAC_SIZE * mac_idx,
+	       old_size - (sizeof(struct mtd_format_v1) + NMTD_8_MAC_SIZE * mac_idx));
+	return 0;
+}
+
+int32_t update_format_v1(unsigned char *new,
+			 unsigned char *old,
+				size_t old_len,
+				int32_t mac_idx, /* of old name */
+				mtd_op_t op,
+				loc_t *loc,
+				struct crypt_inode_info *info,
+				struct master_cipher_info *master,
+				crypt_local_t *local)
+{
+	switch (op) {
+	case MTD_APPEND:
+		mac_idx = 1 + (old_len - sizeof(struct mtd_format_v1))/8;
+	case MTD_OVERWRITE:
+		return appov_link_mac_v1(new, old, old_len, mac_idx,
+					 loc, info, master, local);
+	case MTD_CUT:
+		return cut_link_mac_v1(new, old, old_len, mac_idx,
+				       loc, info, master, local);
+	default:
+		gf_log("crypt", GF_LOG_ERROR, "Bad  mtd operation %d", op);
+		return -1;
+	}
+}
+
+/*
+ * Called by fops:
+ *
+ * ->link()
+ * ->unlink()
+ * ->rename()
+ *
+ */
+int32_t update_format(unsigned char *new,
+		      unsigned char *old,
+		      size_t old_len,
+		      int32_t mac_idx,
+		      mtd_op_t op,
+		      loc_t *loc,
+		      struct crypt_inode_info *info,
+		      struct master_cipher_info *master,
+		      crypt_local_t *local)
+{
+	if (!new)
+		return 0;
+	memcpy(new, old, sizeof(struct crypt_format));
+
+	old += sizeof(struct crypt_format);
+	new += sizeof(struct crypt_format);
+	old_len -= sizeof(struct crypt_format);
+
+	return mtd_loaders[current_mtd_loader()].update_format(new, old,
+							       old_len,
+							       mac_idx, op,
+							       loc, info,
+							       master, local);
+}
+
+/*
+ * Perform preliminary checks of found metadata
+ * Return < 0 on errors;
+ * Return number of object-id MACs (>= 1) on success
+ */
+int32_t check_format_v1(uint32_t len, unsigned char *wire)
+{
+	uint32_t nr_links;
+
+	if (len < sizeof(struct mtd_format_v1)) {
+		gf_log("crypt", GF_LOG_ERROR,
+		       "v1-loader: bad metadata size %d", len);
+		goto error;
+	}
+	len -= sizeof(struct mtd_format_v1);
+	if (len % sizeof(nmtd_8_mac_t)) {
+		gf_log("crypt", GF_LOG_ERROR,
+		       "v1-loader: bad metadata format");
+		goto error;
+	}
+	nr_links = 1 + len / sizeof(nmtd_8_mac_t);
+	if (nr_links > _POSIX_LINK_MAX)
+		goto error;
+	return nr_links;
+ error:
+	return EIO;
+}
+
+/*
+ * Verify per-link MAC specified by index @idx
+ *
+ * return:
+ * -1 on errors;
+ *  0 on failed verification;
+ *  1 on sucessful verification
+ */
+static int32_t verify_link_mac_v1(struct mtd_format_v1 *fmt,
+				  uint32_t idx /* index of the mac to verify */,
+				  loc_t *loc,
+				  struct crypt_inode_info *info,
+				  struct master_cipher_info *master)
+{
+	int32_t ret;
+	unsigned char *mac;
+	unsigned char cmac[16];
+
+	mac = get_NMTD_V1_MAC(fmt) + idx * SIZE_OF_NMTD_V1_MAC;
+
+	ret = calc_link_mac_v1(fmt, loc, cmac, info, master);
+	if (ret)
+		return -1;
+	if (memcmp(cmac, mac, SIZE_OF_NMTD_V1_MAC))
+		return 0;
+	return 1;
+}
+
+/*
+ * Lookup per-link MAC by pathname.
+ *
+ * return index of the MAC, if it was found;
+ * return < 0 on errors, or if the MAC wasn't found
+ */
+static int32_t lookup_link_mac_v1(struct mtd_format_v1 *fmt,
+				  uint32_t nr_macs,
+				  loc_t *loc,
+				  struct crypt_inode_info *info,
+				  struct master_cipher_info *master)
+{
+	int32_t ret;
+	uint32_t idx;
+
+	for (idx = 0; idx < nr_macs; idx++) {
+		ret = verify_link_mac_v1(fmt, idx, loc, info, master);
+		if (ret < 0)
+			return ret;
+		if (ret > 0)
+			return idx;
+	}
+	return -ENOENT;
+}
+
+/*
+ * Extract version-specific part of metadata
+ */
+static int32_t open_format_v1(unsigned char *wire,
+			      int32_t len,
+			      loc_t *loc,
+			      struct crypt_inode_info *info,
+			      struct master_cipher_info *master,
+			      crypt_local_t *local,
+			      gf_boolean_t load_info)
+{
+	int32_t ret;
+	int32_t num_nmtd_macs;
+	struct mtd_format_v1 *fmt;
+	unsigned char mtd_key[16];
+	AES_KEY EMTD_KEY;
+	GCM128_CONTEXT *gctx;
+	uint32_t ad;
+	emtd_8_mac_t gmac;
+	struct object_cipher_info *object;
+
+	num_nmtd_macs = check_format_v1(len, wire);
+	if (num_nmtd_macs <= 0)
+		return EIO;
+	fmt = (struct mtd_format_v1 *)wire;
+
+	ret = lookup_link_mac_v1(fmt, num_nmtd_macs, loc, info, master);
+	if (ret < 0) {
+		gf_log("crypt", GF_LOG_ERROR, "NMTD verification failed");
+		return EINVAL;
+	}
+	local->mac_idx = ret;
+	if (load_info == _gf_false)
+		/* the case of partial open */
+		return 0;
+
+	object = &info->cinfo;
+
+	ret = get_emtd_file_key(info, master, mtd_key);
+	if (ret) {
+		gf_log("crypt", GF_LOG_ERROR, "Can not retrieve metadata key");
+		return ret;
+	}
+	/*
+	 * decrypt encrypted meta-data
+	 */
+	ret = AES_set_encrypt_key(mtd_key, sizeof(mtd_key)*8, &EMTD_KEY);
+	if (ret < 0) {
+		gf_log("crypt", GF_LOG_ERROR, "Can not set encrypt key");
+		return ret;
+	}
+	gctx = CRYPTO_gcm128_new(&EMTD_KEY, (block128_f)AES_encrypt);
+	if (!gctx) {
+		gf_log("crypt", GF_LOG_ERROR, "Can not alloc gcm context");
+		return ENOMEM;
+	}
+	CRYPTO_gcm128_setiv(gctx, info->oid, sizeof(uuid_t));
+
+	ad = htole32(MTD_LOADER_V1);
+	ret = CRYPTO_gcm128_aad(gctx, (const unsigned char *)&ad, sizeof(ad));
+	if (ret) {
+		gf_log("crypt", GF_LOG_ERROR, " CRYPTO_gcm128_aad failed");
+		CRYPTO_gcm128_release(gctx);
+		return ret;	
+	}
+	ret = CRYPTO_gcm128_decrypt(gctx,
+				    get_EMTD_V1(fmt),
+				    get_EMTD_V1(fmt),
+				    SIZE_OF_EMTD_V1);
+	if (ret) {
+		gf_log("crypt", GF_LOG_ERROR, " CRYPTO_gcm128_decrypt failed");
+		CRYPTO_gcm128_release(gctx);
+		return ret;
+	}
+	/*
+	 * verify metadata
+	 */
+	CRYPTO_gcm128_tag(gctx, gmac, sizeof(gmac));
+	CRYPTO_gcm128_release(gctx);
+	if (memcmp(gmac, get_EMTD_V1_MAC(fmt), SIZE_OF_EMTD_V1_MAC)) {
+		gf_log("crypt", GF_LOG_ERROR, "EMTD verification failed");
+		return EINVAL;
+	}
+	/*
+	 * load verified metadata to the private part of inode
+	 */
+	info->nr_minor = fmt->minor_id;
+
+	object->o_alg = fmt->alg_id;
+	object->o_dkey_size = fmt->dkey_factor << KEY_FACTOR_BITS;
+	object->o_block_bits = fmt->block_bits;
+	object->o_mode = fmt->mode_id;
+
+	return check_file_metadata(info);
+}
+
+/*
+ * perform metadata authentication against @loc->path;
+ * extract crypt-specific attribtes and populate @info
+ * with them (optional)
+ */
+int32_t open_format(unsigned char *str,
+		    int32_t len,
+		    loc_t *loc,
+		    struct crypt_inode_info *info,
+		    struct master_cipher_info *master,
+		    crypt_local_t *local,
+		    gf_boolean_t load_info)
+{
+	struct crypt_format *fmt;
+	if (len < sizeof(*fmt)) {
+		gf_log("crypt", GF_LOG_ERROR, "Bad core format");
+		return EIO;
+	}
+	fmt = (struct crypt_format *)str;
+
+	if (fmt->loader_id >= LAST_MTD_LOADER) {
+		gf_log("crypt", GF_LOG_ERROR,
+		       "Unsupported loader id %d", fmt->loader_id);
+		return EINVAL;
+	}
+	str += sizeof(*fmt);
+	len -= sizeof(*fmt);
+
+	return mtd_loaders[fmt->loader_id].open_format(str,
+						       len,
+						       loc,
+						       info,
+						       master,
+						       local,
+						       load_info);
+}
+
+struct crypt_mtd_loader mtd_loaders [LAST_MTD_LOADER] = {
+	[MTD_LOADER_V1] = 
+	{.format_size = format_size_v1,
+	 .create_format = create_format_v1,
+	 .open_format = open_format_v1,
+	 .update_format = update_format_v1
+	}
+};
+
+/*
+  Local variables:
+  c-indentation-style: "K&R"
+  mode-name: "LC"
+  c-basic-offset: 8
+  tab-width: 8
+  fill-column: 80
+  scroll-step: 1
+  End:
+*/
diff --git a/xlators/encryption/crypt/src/metadata.h b/xlators/encryption/crypt/src/metadata.h
new file mode 100644
index 000000000..a92f149ef
--- /dev/null
+++ b/xlators/encryption/crypt/src/metadata.h
@@ -0,0 +1,74 @@
+/*
+  Copyright (c) 2008-2013 Red Hat, Inc. <http://www.redhat.com>
+  This file is part of GlusterFS.
+
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
+*/
+
+#ifndef __METADATA_H__
+#define __METADATA_H__
+
+#define NMTD_8_MAC_SIZE   (8)
+#define EMTD_8_MAC_SIZE   (8)
+
+typedef uint8_t nmtd_8_mac_t[NMTD_8_MAC_SIZE];
+typedef uint8_t emtd_8_mac_t[EMTD_8_MAC_SIZE] ;
+
+/*
+ * Version "v1" of file's metadata.
+ * Metadata of this version has 4 components:
+ * 
+ * 1) EMTD (Encrypted part of MeTaData);
+ * 2) NMTD (Non-encrypted part of MeTaData);
+ * 3) EMTD_MAC; (EMTD Message Authentication Code);
+ * 4) Array of per-link NMTD MACs (for every (hard)link it includes
+ *    exactly one MAC)
+ */
+struct mtd_format_v1 {
+	/* EMTD, encrypted part of meta-data */
+	uint8_t            alg_id;  /* cipher algorithm id (only AES for now) */
+        uint8_t            mode_id; /* cipher mode id; (only XTS for now) */
+	uint8_t            block_bits; /* encoded block size */
+	uint8_t            minor_id; /* client translator id */
+	uint8_t            dkey_factor; /* encoded size of the data key */
+	/* MACs */
+	emtd_8_mac_t       gmac; /* MAC of the encrypted meta-data, 8 bytes */
+	nmtd_8_mac_t       omac; /* per-link MACs of the non-encrypted
+				  * meta-data: at least one such MAC is always
+				  * present */
+} __attribute__((packed));
+
+/*
+ * NMTD, the non-encrypted part of metadata of version "v1"
+ * is file's gfid, which is generated on trusted machines.
+ */
+#define SIZE_OF_NMTD_V1 (sizeof(uuid_t))
+#define SIZE_OF_EMTD_V1 (offsetof(struct mtd_format_v1, gmac) -		\
+			 offsetof(struct mtd_format_v1, alg_id))
+#define SIZE_OF_NMTD_V1_MAC (NMTD_8_MAC_SIZE)
+#define SIZE_OF_EMTD_V1_MAC (EMTD_8_MAC_SIZE)
+
+static inline unsigned char *get_EMTD_V1(struct mtd_format_v1 *format)
+{
+        return &format->alg_id;
+}
+
+static inline unsigned char *get_NMTD_V1(struct crypt_inode_info *info)
+{
+        return info->oid;
+}
+
+static inline unsigned char *get_EMTD_V1_MAC(struct mtd_format_v1 *format)
+{
+        return format->gmac;
+}
+
+static inline unsigned char *get_NMTD_V1_MAC(struct mtd_format_v1 *format)
+{
+        return format->omac;
+}
+
+#endif /* __METADATA_H__ */
diff --git a/xlators/features/Makefile.am b/xlators/features/Makefile.am
index 09aab1293..d2f5ef192 100644
--- a/xlators/features/Makefile.am
+++ b/xlators/features/Makefile.am
@@ -1,4 +1,4 @@
 SUBDIRS = locks quota read-only mac-compat quiesce marker index \
-	  protect # trash path-converter # filter
+	  protect compress changelog gfid-access $(GLUPY_SUBDIR) qemu-block # trash path-converter # filter
 
 CLEANFILES =
diff --git a/xlators/features/changelog/Makefile.am b/xlators/features/changelog/Makefile.am
new file mode 100644
index 000000000..153bb6850
--- /dev/null
+++ b/xlators/features/changelog/Makefile.am
@@ -0,0 +1,3 @@
+SUBDIRS = src lib
+
+CLEANFILES =
diff --git a/xlators/storage/bd_map/Makefile.am b/xlators/features/changelog/lib/Makefile.am
index a985f42a8..a985f42a8 100644
--- a/xlators/storage/bd_map/Makefile.am
+++ b/xlators/features/changelog/lib/Makefile.am
diff --git a/xlators/features/changelog/lib/examples/c/get-changes.c b/xlators/features/changelog/lib/examples/c/get-changes.c
new file mode 100644
index 000000000..14562585a
--- /dev/null
+++ b/xlators/features/changelog/lib/examples/c/get-changes.c
@@ -0,0 +1,87 @@
+/*
+   Copyright (c) 2013 Red Hat, Inc. <http://www.redhat.com>
+   This file is part of GlusterFS.
+
+   This file is licensed to you under your choice of the GNU Lesser
+   General Public License, version 3 or any later version (LGPLv3 or
+   later), or the GNU General Public License, version 2 (GPLv2), in all
+   cases as published by the Free Software Foundation.
+*/
+
+/**
+ * get set of new changes every 10 seconds (just print the file names)
+ *
+ * Compile it using:
+ *  gcc -o getchanges `pkg-config --cflags libgfchangelog` get-changes.c \
+ *  `pkg-config --libs libgfchangelog`
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/un.h>
+#include <limits.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <errno.h>
+
+#include "changelog.h"
+
+#define handle_error(fn)                                \
+        printf ("%s (reason: %s)\n", fn, strerror (errno))
+
+int
+main (int argc, char ** argv)
+{
+        int     i           = 0;
+        int     ret         = 0;
+        ssize_t nr_changes  = 0;
+        ssize_t changes     = 0;
+        char fbuf[PATH_MAX] = {0,};
+
+        /* get changes for brick "/home/vshankar/export/yow/yow-1" */
+        ret = gf_changelog_register ("/home/vshankar/export/yow/yow-1",
+                                     "/tmp/scratch", "/tmp/change.log", 9, 5);
+        if (ret) {
+                handle_error ("register failed");
+                goto out;
+        }
+
+        while (1) {
+                i = 0;
+                nr_changes = gf_changelog_scan ();
+                if (nr_changes < 0) {
+                        handle_error ("scan(): ");
+                        break;
+                }
+
+                if (nr_changes == 0)
+                        goto next;
+
+                printf ("Got %ld changelog files\n", nr_changes);
+
+                while ( (changes =
+                         gf_changelog_next_change (fbuf, PATH_MAX)) > 0) {
+                        printf ("changelog file [%d]: %s\n", ++i, fbuf);
+
+                        /* process changelog */
+                        /* ... */
+                        /* ... */
+                        /* ... */
+                        /* done processing */
+
+                        ret = gf_changelog_done (fbuf);
+                        if (ret)
+                                handle_error ("gf_changelog_done");
+                }
+
+                if (changes == -1)
+                        handle_error ("gf_changelog_next_change");
+
+        next:
+                sleep (10);
+        }
+
+ out:
+        return ret;
+}
diff --git a/xlators/features/changelog/lib/examples/python/changes.py b/xlators/features/changelog/lib/examples/python/changes.py
new file mode 100644
index 000000000..d21db8eab
--- /dev/null
+++ b/xlators/features/changelog/lib/examples/python/changes.py
@@ -0,0 +1,32 @@
+#!/usr/bin/python
+
+import os
+import sys
+import time
+import libgfchangelog
+
+cl = libgfchangelog.Changes()
+
+def get_changes(brick, scratch_dir, log_file, log_level, interval):
+    change_list = []
+    try:
+        cl.cl_register(brick, scratch_dir, log_file, log_level)
+        while True:
+            cl.cl_scan()
+            change_list = cl.cl_getchanges()
+            if change_list:
+                print change_list
+            for change in change_list:
+                print('done with %s' % (change))
+                cl.cl_done(change)
+            time.sleep(interval)
+    except OSError:
+        ex = sys.exc_info()[1]
+        print ex
+
+if __name__ == '__main__':
+    if len(sys.argv) != 5:
+        print("usage: %s <brick> <scratch-dir> <log-file> <fetch-interval>"
+              % (sys.argv[0]))
+        sys.exit(1)
+    get_changes(sys.argv[1], sys.argv[2], sys.argv[3], 9, int(sys.argv[4]))
diff --git a/xlators/features/changelog/lib/examples/python/libgfchangelog.py b/xlators/features/changelog/lib/examples/python/libgfchangelog.py
new file mode 100644
index 000000000..68ec3baf1
--- /dev/null
+++ b/xlators/features/changelog/lib/examples/python/libgfchangelog.py
@@ -0,0 +1,64 @@
+import os
+from ctypes import *
+from ctypes.util import find_library
+
+class Changes(object):
+    libgfc = CDLL(find_library("gfchangelog"), use_errno=True)
+
+    @classmethod
+    def geterrno(cls):
+        return get_errno()
+
+    @classmethod
+    def raise_oserr(cls):
+        errn = cls.geterrno()
+        raise OSError(errn, os.strerror(errn))
+
+    @classmethod
+    def _get_api(cls, call):
+        return getattr(cls.libgfc, call)
+
+    @classmethod
+    def cl_register(cls, brick, path, log_file, log_level, retries = 0):
+        ret = cls._get_api('gf_changelog_register')(brick, path,
+                                                    log_file, log_level, retries)
+        if ret == -1:
+            cls.raise_oserr()
+
+    @classmethod
+    def cl_scan(cls):
+        ret = cls._get_api('gf_changelog_scan')()
+        if ret == -1:
+            cls.raise_oserr()
+
+    @classmethod
+    def cl_startfresh(cls):
+        ret = cls._get_api('gf_changelog_start_fresh')()
+        if ret == -1:
+            cls.raise_oserr()
+
+    @classmethod
+    def cl_getchanges(cls):
+        """ remove hardcoding for path name length """
+        def clsort(f):
+            return f.split('.')[-1]
+        changes = []
+        buf = create_string_buffer('\0', 4096)
+        call = cls._get_api('gf_changelog_next_change')
+
+        while True:
+            ret = call(buf, 4096)
+            if ret in (0, -1):
+                break;
+            changes.append(buf.raw[:ret-1])
+        if ret == -1:
+            cls.raise_oserr()
+        # cleanup tracker
+        cls.cl_startfresh()
+        return sorted(changes, key=clsort)
+
+    @classmethod
+    def cl_done(cls, clfile):
+        ret = cls._get_api('gf_changelog_done')(clfile)
+        if ret == -1:
+            cls.raise_oserr()
diff --git a/xlators/features/changelog/lib/src/Makefile.am b/xlators/features/changelog/lib/src/Makefile.am
new file mode 100644
index 000000000..fbaaea628
--- /dev/null
+++ b/xlators/features/changelog/lib/src/Makefile.am
@@ -0,0 +1,37 @@
+libgfchangelog_la_CFLAGS = -Wall $(GF_CFLAGS) $(GF_DARWIN_LIBGLUSTERFS_CFLAGS) \
+			-DDATADIR=\"$(localstatedir)\"
+
+libgfchangelog_la_CPPFLAGS = $(GF_CPPFLAGS) -D__USE_FILE_OFFSET64 -fpic \
+				-I../../../src/ -I$(top_srcdir)/libglusterfs/src \
+				-I$(top_srcdir)/xlators/features/changelog/src \
+				-DDATADIR=\"$(localstatedir)\"
+
+libgfchangelog_la_LIBADD = $(top_builddir)/libglusterfs/src/libglusterfs.la \
+			$(GF_GLUSTERFS_LIBS)
+
+libgfchangelog_la_LDFLAGS = $(GF_LDFLAGS)
+
+libgfchangelogdir = $(includedir)/glusterfs/gfchangelog
+lib_LTLIBRARIES = libgfchangelog.la
+
+CONTRIB_BUILDDIR = $(top_builddir)/contrib
+
+libgfchangelog_la_SOURCES = gf-changelog.c gf-changelog-process.c \
+		gf-changelog-helpers.c $(CONTRIBDIR)/uuid/clear.c \
+		$(CONTRIBDIR)/uuid/copy.c $(CONTRIBDIR)/uuid/gen_uuid.c \
+		$(CONTRIBDIR)/uuid/pack.c $(CONTRIBDIR)/uuid/parse.c \
+		$(CONTRIBDIR)/uuid/unparse.c $(CONTRIBDIR)/uuid/uuid_time.c \
+		$(CONTRIBDIR)/uuid/compare.c $(CONTRIBDIR)/uuid/isnull.c \
+		$(CONTRIBDIR)/uuid/unpack.c
+
+noinst_HEADERS = gf-changelog-helpers.h $(CONTRIBDIR)/uuid/uuidd.h \
+		$(CONTRIBDIR)/uuid/uuid.h $(CONTRIBDIR)/uuid/uuidP.h \
+		$(CONTRIB_BUILDDIR)/uuid/uuid_types.h
+
+libgfchangelog_HEADERS = changelog.h
+
+CLEANFILES =
+CONFIG_CLEAN_FILES = $(CONTRIB_BUILDDIR)/uuid/uuid_types.h
+
+$(top_builddir)/libglusterfs/src/libglusterfs.la:
+	$(MAKE) -C $(top_builddir)/libglusterfs/src/ all
diff --git a/xlators/features/changelog/lib/src/changelog.h b/xlators/features/changelog/lib/src/changelog.h
new file mode 100644
index 000000000..5cddfb583
--- /dev/null
+++ b/xlators/features/changelog/lib/src/changelog.h
@@ -0,0 +1,31 @@
+/*
+   Copyright (c) 2013 Red Hat, Inc. <http://www.redhat.com>
+   This file is part of GlusterFS.
+
+   This file is licensed to you under your choice of the GNU Lesser
+   General Public License, version 3 or any later version (LGPLv3 or
+   later), or the GNU General Public License, version 2 (GPLv2), in all
+   cases as published by the Free Software Foundation.
+*/
+
+#ifndef _GF_CHANGELOG_H
+#define _GF_CHANGELOG_H
+
+/* API set */
+
+int
+gf_changelog_register (char *brick_path, char *scratch_dir,
+                       char *log_file, int log_levl, int max_reconnects);
+ssize_t
+gf_changelog_scan ();
+
+int
+gf_changelog_start_fresh ();
+
+ssize_t
+gf_changelog_next_change (char *bufptr, size_t maxlen);
+
+int
+gf_changelog_done (char *file);
+
+#endif
diff --git a/xlators/features/changelog/lib/src/gf-changelog-helpers.c b/xlators/features/changelog/lib/src/gf-changelog-helpers.c
new file mode 100644
index 000000000..1eef8bf04
--- /dev/null
+++ b/xlators/features/changelog/lib/src/gf-changelog-helpers.c
@@ -0,0 +1,180 @@
+/*
+   Copyright (c) 2013 Red Hat, Inc. <http://www.redhat.com>
+   This file is part of GlusterFS.
+
+   This file is licensed to you under your choice of the GNU Lesser
+   General Public License, version 3 or any later version (LGPLv3 or
+   later), or the GNU General Public License, version 2 (GPLv2), in all
+   cases as published by the Free Software Foundation.
+*/
+
+#include "changelog-mem-types.h"
+#include "gf-changelog-helpers.h"
+
+ssize_t gf_changelog_read_path (int fd, char *buffer, size_t bufsize)
+{
+        return read (fd, buffer, bufsize);
+}
+
+size_t
+gf_changelog_write (int fd, char *buffer, size_t len)
+{
+        ssize_t size = 0;
+        size_t writen = 0;
+
+        while (writen < len) {
+                size = write (fd,
+                              buffer + writen, len - writen);
+                if (size <= 0)
+                        break;
+
+                writen += size;
+        }
+
+        return writen;
+}
+
+void
+gf_rfc3986_encode (unsigned char *s, char *enc, char *estr)
+{
+        for (; *s; s++) {
+                if (estr[*s])
+                        sprintf(enc, "%c", estr[*s]);
+                else
+                        sprintf(enc, "%%%02X", *s);
+                while (*++enc);
+        }
+}
+
+/**
+ * thread safe version of readline with buffering
+ * (taken from Unix Network Programming Volume I, W.R. Stevens)
+ *
+ * This is favoured over fgets() as we'd need to ftruncate()
+ * (see gf_changelog_scan() API) to record new changelog files.
+ * stream open functions does have a truncate like api (although
+ * that can be done via @fflush(fp), @ftruncate(fd) and @fseek(fp),
+ * but this involves mixing POSIX file descriptors and stream FILE *).
+ *
+ * NOTE: This implmentation still does work with more than one fd's
+ *       used to perform gf_readline(). For this very reason it's not
+ *       made a part of libglusterfs.
+ */
+
+static pthread_key_t rl_key;
+static pthread_once_t rl_once = PTHREAD_ONCE_INIT;
+
+static void
+readline_destructor (void *ptr)
+{
+        GF_FREE (ptr);
+}
+
+static void
+readline_once (void)
+{
+        pthread_key_create (&rl_key, readline_destructor);
+}
+
+static ssize_t
+my_read (read_line_t *tsd, int fd, char *ptr)
+{
+        if (tsd->rl_cnt <= 0) {
+                if ( (tsd->rl_cnt = read (fd, tsd->rl_buf, MAXLINE)) < 0 )
+                        return -1;
+                else if (tsd->rl_cnt == 0)
+                        return 0;
+                tsd->rl_bufptr = tsd->rl_buf;
+        }
+
+        tsd->rl_cnt--;
+        *ptr = *tsd->rl_bufptr++;
+        return 1;
+}
+
+static int
+gf_readline_init_once (read_line_t **tsd)
+{
+        if (pthread_once (&rl_once, readline_once) != 0)
+                return -1;
+
+        *tsd = pthread_getspecific (rl_key);
+        if (*tsd)
+                goto out;
+
+        *tsd = GF_CALLOC (1, sizeof (**tsd),
+                          gf_changelog_mt_libgfchangelog_rl_t);
+        if (!*tsd)
+                return -1;
+
+        if (pthread_setspecific (rl_key, *tsd) != 0)
+                return -1;
+
+ out:
+        return 0;
+}
+
+ssize_t
+gf_readline (int fd, void *vptr, size_t maxlen)
+{
+        size_t       n   = 0;
+        size_t       rc  = 0;
+        char         c   = ' ';
+        char        *ptr = NULL;
+        read_line_t *tsd = NULL;
+
+        if (gf_readline_init_once (&tsd))
+                return -1;
+
+        ptr = vptr;
+        for (n = 1; n < maxlen; n++) {
+                if ( (rc = my_read (tsd, fd, &c)) == 1 ) {
+                        *ptr++ = c;
+                        if (c == '\n')
+                                break;
+                } else if (rc == 0) {
+                        *ptr = '\0';
+                        return (n - 1);
+                } else
+                        return -1;
+        }
+
+        *ptr = '\0';
+        return n;
+
+}
+
+off_t
+gf_lseek (int fd, off_t offset, int whence)
+{
+        off_t        off = 0;
+        read_line_t *tsd = NULL;
+
+        if (gf_readline_init_once (&tsd))
+                return -1;
+
+        if ( (off = lseek (fd, offset, whence)) == -1)
+                return -1;
+
+        tsd->rl_cnt = 0;
+        tsd->rl_bufptr = tsd->rl_buf;
+
+        return off;
+}
+
+int
+gf_ftruncate (int fd, off_t length)
+{
+        read_line_t *tsd = NULL;
+
+        if (gf_readline_init_once (&tsd))
+                return -1;
+
+        if (ftruncate (fd, 0))
+                return -1;
+
+        tsd->rl_cnt = 0;
+        tsd->rl_bufptr = tsd->rl_buf;
+
+        return 0;
+}
diff --git a/xlators/features/changelog/lib/src/gf-changelog-helpers.h b/xlators/features/changelog/lib/src/gf-changelog-helpers.h
new file mode 100644
index 000000000..3aa6ed7b8
--- /dev/null
+++ b/xlators/features/changelog/lib/src/gf-changelog-helpers.h
@@ -0,0 +1,97 @@
+/*
+   Copyright (c) 2013 Red Hat, Inc. <http://www.redhat.com>
+   This file is part of GlusterFS.
+
+   This file is licensed to you under your choice of the GNU Lesser
+   General Public License, version 3 or any later version (LGPLv3 or
+   later), or the GNU General Public License, version 2 (GPLv2), in all
+   cases as published by the Free Software Foundation.
+*/
+
+#ifndef _GF_CHANGELOG_HELPERS_H
+#define _GF_CHANGELOG_HELPERS_H
+
+#include <unistd.h>
+#include <dirent.h>
+#include <limits.h>
+#include <pthread.h>
+
+#include <xlator.h>
+
+#define GF_CHANGELOG_TRACKER  "tracker"
+
+#define GF_CHANGELOG_CURRENT_DIR    ".current"
+#define GF_CHANGELOG_PROCESSED_DIR  ".processed"
+#define GF_CHANGELOG_PROCESSING_DIR ".processing"
+
+#ifndef MAXLINE
+#define MAXLINE 4096
+#endif
+
+#define GF_CHANGELOG_FILL_BUFFER(ptr, ascii, off, len) do {     \
+                memcpy (ascii + off, ptr, len);                 \
+                off += len;                                     \
+        } while (0)
+
+typedef struct read_line {
+        int rl_cnt;
+        char *rl_bufptr;
+        char rl_buf[MAXLINE];
+} read_line_t;
+
+typedef struct gf_changelog {
+        xlator_t *this;
+
+        /* 'processing' directory stream */
+        DIR *gfc_dir;
+
+        /* fd to the tracker file */
+        int gfc_fd;
+
+        /* connection retries */
+        int gfc_connretries;
+
+        char gfc_sockpath[PATH_MAX];
+
+        char gfc_brickpath[PATH_MAX];
+
+        /* socket for recieving notifications */
+        int gfc_sockfd;
+
+        char *gfc_working_dir;
+
+        /* RFC 3986 string encoding */
+        char rfc3986[256];
+
+        char gfc_current_dir[PATH_MAX];
+        char gfc_processed_dir[PATH_MAX];
+        char gfc_processing_dir[PATH_MAX];
+
+        pthread_t gfc_changelog_processor;
+} gf_changelog_t;
+
+int
+gf_changelog_notification_init (xlator_t *this, gf_changelog_t *gfc);
+
+void *
+gf_changelog_process (void *data);
+
+ssize_t
+gf_changelog_read_path (int fd, char *buffer, size_t bufsize);
+
+void
+gf_rfc3986_encode (unsigned char *s, char *enc, char *estr);
+
+size_t
+gf_changelog_write (int fd, char *buffer, size_t len);
+
+ssize_t
+gf_readline (int fd, void *vptr, size_t maxlen);
+
+int
+gf_ftruncate (int fd, off_t length);
+
+off_t
+gf_lseek (int fd, off_t offset, int whence);
+
+#endif
diff --git a/xlators/features/changelog/lib/src/gf-changelog-process.c b/xlators/features/changelog/lib/src/gf-changelog-process.c
new file mode 100644
index 000000000..df7204931
--- /dev/null
+++ b/xlators/features/changelog/lib/src/gf-changelog-process.c
@@ -0,0 +1,571 @@
+/*
+   Copyright (c) 2013 Red Hat, Inc. <http://www.redhat.com>
+   This file is part of GlusterFS.
+
+   This file is licensed to you under your choice of the GNU Lesser
+   General Public License, version 3 or any later version (LGPLv3 or
+   later), or the GNU General Public License, version 2 (GPLv2), in all
+   cases as published by the Free Software Foundation.
+*/
+
+#include <unistd.h>
+#include <pthread.h>
+
+#include "uuid.h"
+#include "globals.h"
+#include "glusterfs.h"
+
+#include "gf-changelog-helpers.h"
+
+/* from the changelog translator */
+#include "changelog-misc.h"
+
+extern int byebye;
+
+/**
+ * number of gfid records after fop number
+ */
+int nr_gfids[] = {
+        [GF_FOP_MKNOD]   = 1,
+        [GF_FOP_MKDIR]   = 1,
+        [GF_FOP_UNLINK]  = 1,
+        [GF_FOP_RMDIR]   = 1,
+        [GF_FOP_SYMLINK] = 1,
+        [GF_FOP_RENAME]  = 2,
+        [GF_FOP_LINK]    = 1,
+        [GF_FOP_CREATE]  = 1,
+};
+
+static char *
+binary_to_ascii (uuid_t uuid)
+{
+        return uuid_utoa (uuid);
+}
+
+static char *
+conv_noop (char *ptr) { return ptr; }
+
+#define VERIFY_SEPARATOR(ptr, plen, perr)       \
+        {                                       \
+                if (*(ptr + plen) != '\0') {    \
+                        perr = 1;               \
+                        break;                  \
+                }                               \
+        }
+
+#define MOVER_MOVE(mover, nleft, bytes)         \
+        {                                       \
+                mover += bytes;                 \
+                nleft -= bytes;                 \
+        }                                       \
+
+#define PARSE_GFID(mov, ptr, le, fn, perr)                      \
+        {                                                       \
+                VERIFY_SEPARATOR (mov, le, perr);               \
+                ptr = fn (mov);                                 \
+                if (!ptr) {                                     \
+                        perr = 1;                               \
+                        break;                                  \
+                }                                               \
+        }
+
+#define FILL_AND_MOVE(pt, buf, of, mo, nl, le)                          \
+        {                                                               \
+                GF_CHANGELOG_FILL_BUFFER (pt, buf, of, strlen (pt));    \
+                MOVER_MOVE (mo, nl, le);                                \
+        }
+
+
+#define PARSE_GFID_MOVE(ptr, uuid, mover, nleft, perr)          \
+        {                                                       \
+                memcpy (uuid, mover, sizeof (uuid_t));          \
+                ptr = binary_to_ascii (uuid);                   \
+                if (!ptr) {                                     \
+                        perr = 1;                               \
+                        break;                                  \
+                }                                               \
+                MOVER_MOVE (mover, nleft, sizeof (uuid_t));     \
+        }                                                       \
+
+#define LINE_BUFSIZE  3*PATH_MAX /* enough buffer for extra chars too */
+
+/**
+ * using mmap() makes parsing easy. fgets() cannot be used here as
+ * the binary gfid could contain a line-feed (0x0A), in that case fgets()
+ * would read an incomplete line and parsing would fail. using POSIX fds
+ * would result is additional code to maintain state in case of partial
+ * reads of data (where multiple entries do not fit extirely in the buffer).
+ *
+ * mmap() gives the flexibility of pointing to an offset in the file
+ * without us worrying about reading it in memory (VM does that for us for
+ * free).
+ */
+
+static int
+gf_changelog_parse_binary (xlator_t *this,
+                           gf_changelog_t *gfc, int from_fd, int to_fd,
+                           size_t start_offset, struct stat *stbuf)
+
+{
+        int     ret              = -1;
+        off_t   off              = 0;
+        off_t   nleft            = 0;
+        uuid_t  uuid             = {0,};
+        char   *ptr              = NULL;
+        char   *bname_start      = NULL;
+        char   *bname_end        = NULL;
+        char   *mover            = NULL;
+        char   *start            = NULL;
+        char    current_mover    = ' ';
+        size_t  blen             = 0;
+        int     parse_err        = 0;
+        char ascii[LINE_BUFSIZE] = {0,};
+
+        nleft = stbuf->st_size;
+
+        start = (char *) mmap (NULL, nleft,
+                               PROT_READ, MAP_PRIVATE, from_fd, 0);
+        if (!start) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "mmap() error (reason: %s)", strerror (errno));
+                goto out;
+        }
+
+        mover = start;
+
+        MOVER_MOVE (mover, nleft, start_offset);
+
+        while (nleft > 0) {
+
+                off = blen = 0;
+                ptr = bname_start = bname_end = NULL;
+
+                current_mover = *mover;
+
+                switch (current_mover) {
+                case 'D':
+                case 'M':
+                        MOVER_MOVE (mover, nleft, 1);
+                        PARSE_GFID_MOVE (ptr, uuid, mover, nleft, parse_err);
+
+                        break;
+
+                case 'E':
+                        MOVER_MOVE (mover, nleft, 1);
+                        PARSE_GFID_MOVE (ptr, uuid, mover, nleft, parse_err);
+
+                        bname_start = mover;
+                        if ( (bname_end = strchr (mover, '\n')) == NULL ) {
+                                parse_err = 1;
+                                break;
+                        }
+
+                        blen = bname_end - bname_start;
+                        MOVER_MOVE (mover, nleft, blen);
+
+                        break;
+
+                default:
+                        parse_err = 1;
+                }
+
+                if (parse_err)
+                        break;
+
+                GF_CHANGELOG_FILL_BUFFER (&current_mover, ascii, off, 1);
+                GF_CHANGELOG_FILL_BUFFER (" ", ascii, off, 1);
+                GF_CHANGELOG_FILL_BUFFER (ptr, ascii, off, strlen (ptr));
+                if (blen)
+                        GF_CHANGELOG_FILL_BUFFER (bname_start,
+                                                  ascii, off, blen);
+                GF_CHANGELOG_FILL_BUFFER ("\n", ascii, off, 1);
+
+                if (gf_changelog_write (to_fd, ascii, off) != off) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "processing binary changelog failed due to "
+                                " error in writing ascii change (reason: %s)",
+                                strerror (errno));
+                        break;
+                }
+
+                MOVER_MOVE (mover, nleft, 1);
+        }
+
+        if ( (nleft == 0) && (!parse_err))
+                ret = 0;
+
+        if (munmap (start, stbuf->st_size))
+                gf_log (this->name, GF_LOG_ERROR,
+                        "munmap() error (reason: %s)", strerror (errno));
+ out:
+        return ret;
+}
+
+/**
+ * ascii decoder:
+ *  - separate out one entry from another
+ *  - use fop name rather than fop number
+ */
+static int
+gf_changelog_parse_ascii (xlator_t *this,
+                          gf_changelog_t *gfc, int from_fd, int to_fd,
+                          size_t start_offset, struct stat *stbuf)
+{
+        int         ng            = 0;
+        int         ret           = -1;
+        int         fop           = 0;
+        int         len           = 0;
+        off_t       off           = 0;
+        off_t       nleft         = 0;
+        char       *ptr           = NULL;
+        char       *eptr          = NULL;
+        char       *start         = NULL;
+        char       *mover         = NULL;
+        int         parse_err     = 0;
+        char        current_mover = ' ';
+        char ascii[LINE_BUFSIZE]  = {0,};
+        const char *fopname       = NULL;
+
+        nleft = stbuf->st_size;
+
+        start = (char *) mmap (NULL, nleft,
+                               PROT_READ, MAP_PRIVATE, from_fd, 0);
+        if (!start) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "mmap() error (reason: %s)", strerror (errno));
+                goto out;
+        }
+
+        mover = start;
+
+        MOVER_MOVE (mover, nleft, start_offset);
+
+        while (nleft > 0) {
+                off = 0;
+                current_mover = *mover;
+
+                GF_CHANGELOG_FILL_BUFFER (&current_mover, ascii, off, 1);
+                GF_CHANGELOG_FILL_BUFFER (" ", ascii, off, 1);
+
+                switch (current_mover) {
+                case 'D':
+                case 'M':
+                        MOVER_MOVE (mover, nleft, 1);
+
+                        /* target gfid */
+                        PARSE_GFID (mover, ptr, UUID_CANONICAL_FORM_LEN,
+                                    conv_noop, parse_err);
+                        FILL_AND_MOVE(ptr, ascii, off,
+                                      mover, nleft, UUID_CANONICAL_FORM_LEN);
+                        break;
+
+                case 'E':
+                        MOVER_MOVE (mover, nleft, 1);
+
+                        /* target gfid */
+                        PARSE_GFID (mover, ptr, UUID_CANONICAL_FORM_LEN,
+                                    conv_noop, parse_err);
+                        FILL_AND_MOVE (ptr, ascii, off,
+                                       mover, nleft, UUID_CANONICAL_FORM_LEN);
+                        FILL_AND_MOVE (" ", ascii, off,
+                                       mover, nleft, 1);
+
+                        /* fop */
+                        len = strlen (mover);
+                        VERIFY_SEPARATOR (mover, len, parse_err);
+
+                        fop = atoi (mover);
+                        if ( (fopname = gf_fop_list[fop]) == NULL) {
+                                parse_err = 1;
+                                break;
+                        }
+
+                        MOVER_MOVE (mover, nleft, len);
+
+                        len = strlen (fopname);
+                        GF_CHANGELOG_FILL_BUFFER (fopname, ascii, off, len);
+
+                        /* pargfid + bname */
+                        ng = nr_gfids[fop];
+                        while (ng-- > 0) {
+                                MOVER_MOVE (mover, nleft, 1);
+                                len = strlen (mover);
+                                GF_CHANGELOG_FILL_BUFFER (" ", ascii, off, 1);
+
+                                PARSE_GFID (mover, ptr, len,
+                                            conv_noop, parse_err);
+                                eptr = calloc (3, strlen (ptr));
+                                if (!eptr) {
+                                        parse_err = 1;
+                                        break;
+                                }
+
+                                gf_rfc3986_encode ((unsigned char *) ptr,
+                                                   eptr, gfc->rfc3986);
+                                FILL_AND_MOVE (eptr, ascii, off,
+                                               mover, nleft, len);
+                                free (eptr);
+                        }
+
+                        break;
+                default:
+                        parse_err = 1;
+                }
+
+                if (parse_err)
+                        break;
+
+                GF_CHANGELOG_FILL_BUFFER ("\n", ascii, off, 1);
+
+                if (gf_changelog_write (to_fd, ascii, off) != off) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "processing ascii changelog failed due to "
+                                " wrror in writing change (reason: %s)",
+                                strerror (errno));
+                        break;
+                }
+
+                MOVER_MOVE (mover, nleft, 1);
+
+        }
+
+        if ( (nleft == 0) && (!parse_err))
+                ret = 0;
+
+        if (munmap (start, stbuf->st_size))
+                gf_log (this->name, GF_LOG_ERROR,
+                        "munmap() error (reason: %s)", strerror (errno));
+
+ out:
+        return ret;
+}
+
+#define COPY_BUFSIZE  8192
+static int
+gf_changelog_copy (xlator_t *this, int from_fd, int to_fd)
+{
+        ssize_t size                  = 0;
+        char   buffer[COPY_BUFSIZE+1] = {0,};
+
+        while (1) {
+                size = read (from_fd, buffer, COPY_BUFSIZE);
+                if (size <= 0)
+                        break;
+
+                if (gf_changelog_write (to_fd,
+                                        buffer, size) != size) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "error processing ascii changlog");
+                        size = -1;
+                        break;
+                }
+        }
+
+        return (size < 0 ? -1 : 0);
+}
+
+static int
+gf_changelog_decode (xlator_t *this, gf_changelog_t *gfc, int from_fd,
+                     int to_fd, struct stat *stbuf, int *zerob)
+{
+        int    ret        = -1;
+        int    encoding   = -1;
+        size_t elen       = 0;
+        char buffer[1024] = {0,};
+
+        CHANGELOG_GET_ENCODING (from_fd, buffer, 1024, encoding, elen);
+        if (encoding == -1) /* unknown encoding */
+                goto out;
+
+        if (!CHANGELOG_VALID_ENCODING (encoding))
+                goto out;
+
+        if (elen == stbuf->st_size) {
+                *zerob = 1;
+                goto out;
+        }
+
+        /**
+         * start processing after the header
+         */
+        lseek (from_fd, elen, SEEK_SET);
+
+        switch (encoding) {
+        case CHANGELOG_ENCODE_BINARY:
+                /**
+                 * this ideally should have been a part of changelog-encoders.c
+                 * (ie. part of the changelog translator).
+                 */
+                ret = gf_changelog_parse_binary (this, gfc, from_fd,
+                                                 to_fd, elen, stbuf);
+                break;
+
+        case CHANGELOG_ENCODE_ASCII:
+                ret = gf_changelog_parse_ascii (this, gfc, from_fd,
+                                                to_fd, elen, stbuf);
+                break;
+        default:
+                ret = gf_changelog_copy (this, from_fd, to_fd);
+        }
+
+ out:
+        return ret;
+}
+
+static int
+gf_changelog_consume (xlator_t *this, gf_changelog_t *gfc, char *from_path)
+{
+        int         ret        = -1;
+        int         fd1        = 0;
+        int         fd2        = 0;
+        int         zerob      = 0;
+        struct stat stbuf      = {0,};
+        char dest[PATH_MAX]    = {0,};
+        char to_path[PATH_MAX] = {0,};
+
+        ret = stat (from_path, &stbuf);
+        if (ret || !S_ISREG(stbuf.st_mode)) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "stat failed on changelog file: %s", from_path);
+                goto out;
+        }
+
+        fd1 = open (from_path, O_RDONLY);
+        if (fd1 < 0) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "cannot open changelog file: %s (reason: %s)",
+                        from_path, strerror (errno));
+                goto out;
+        }
+
+        (void) snprintf (to_path, PATH_MAX, "%s%s",
+                         gfc->gfc_current_dir, basename (from_path));
+        (void) snprintf (dest, PATH_MAX, "%s%s",
+                         gfc->gfc_processing_dir, basename (from_path));
+
+        fd2 = open (to_path, O_CREAT | O_TRUNC | O_RDWR,
+                    S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
+        if (fd2 < 0) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "cannot create ascii changelog file %s (reason %s)",
+                        to_path, strerror (errno));
+                goto close_fd;
+        } else {
+                ret = gf_changelog_decode (this, gfc, fd1,
+                                           fd2, &stbuf, &zerob);
+
+                close (fd2);
+
+                if (!ret) {
+                        /* move it to processing on a successfull
+                           decode */
+                        ret = rename (to_path, dest);
+                        if (ret)
+                                gf_log (this->name, GF_LOG_ERROR,
+                                        "error moving %s to processing dir"
+                                        " (reason: %s)", to_path,
+                                        strerror (errno));
+                }
+
+                /* remove it from .current if it's an empty file */
+                if (zerob) {
+                        ret = unlink (to_path);
+                        if (ret)
+                                gf_log (this->name, GF_LOG_ERROR,
+                                        "could not unlink %s (reason: %s",
+                                        to_path, strerror (errno));
+                }
+        }
+
+ close_fd:
+        close (fd1);
+
+ out:
+        return ret;
+}
+
+static char *
+gf_changelog_ext_change (xlator_t *this,
+                         gf_changelog_t *gfc, char *path, size_t readlen)
+{
+        int     alo = 0;
+        int     ret = 0;
+        size_t  len = 0;
+        char   *buf = NULL;
+
+        buf = path;
+        while (len < readlen) {
+                if (*buf == '\0') {
+                        alo = 1;
+                        gf_log (this->name, GF_LOG_DEBUG,
+                                "processing changelog: %s", path);
+                        ret = gf_changelog_consume (this, gfc, path);
+                }
+
+                if (ret)
+                        break;
+
+                len++; buf++;
+                if (alo) {
+                        alo = 0;
+                        path = buf;
+                }
+        }
+
+        return (ret) ? NULL : path;
+}
+
+void *
+gf_changelog_process (void *data)
+{
+        ssize_t         len      = 0;
+        ssize_t         offlen   = 0;
+        xlator_t       *this     = NULL;
+        char           *sbuf     = NULL;
+        gf_changelog_t *gfc      = NULL;
+        char from_path[PATH_MAX] = {0,};
+
+        gfc = (gf_changelog_t *) data;
+        this = gfc->this;
+
+        pthread_detach (pthread_self());
+
+        for (;;) {
+                len = gf_changelog_read_path (gfc->gfc_sockfd,
+                                              from_path + offlen,
+                                              PATH_MAX - offlen);
+                if (len < 0)
+                        continue; /* ignore it for now */
+
+                if (len == 0) { /* close() from the changelog translator */
+                        gf_log (this->name, GF_LOG_INFO, "close from changelog"
+                                " notification translator.");
+
+                        if (gfc->gfc_connretries != 1) {
+                                if (!gf_changelog_notification_init(this, gfc))
+                                        continue;
+                        }
+
+                        byebye = 1;
+                        break;
+                }
+
+                len += offlen;
+                sbuf = gf_changelog_ext_change (this, gfc, from_path, len);
+                if (!sbuf) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "could not extract changelog filename");
+                        continue;
+                }
+
+                offlen = 0;
+                if (sbuf != (from_path + len)) {
+                        offlen = from_path + len - sbuf;
+                        memmove (from_path, sbuf, offlen);
+                }
+        }
+
+        gf_log (this->name, GF_LOG_DEBUG,
+                "byebye (%d) from processing thread...", byebye);
+        return NULL;
+}
diff --git a/xlators/features/changelog/lib/src/gf-changelog.c b/xlators/features/changelog/lib/src/gf-changelog.c
new file mode 100644
index 000000000..ca8e373e7
--- /dev/null
+++ b/xlators/features/changelog/lib/src/gf-changelog.c
@@ -0,0 +1,515 @@
+/*
+   Copyright (c) 2013 Red Hat, Inc. <http://www.redhat.com>
+   This file is part of GlusterFS.
+
+   This file is licensed to you under your choice of the GNU Lesser
+   General Public License, version 3 or any later version (LGPLv3 or
+   later), or the GNU General Public License, version 2 (GPLv2), in all
+   cases as published by the Free Software Foundation.
+*/
+
+#include <errno.h>
+#include <dirent.h>
+#include <stddef.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+#include <string.h>
+
+#include "globals.h"
+#include "glusterfs.h"
+#include "logging.h"
+
+#include "gf-changelog-helpers.h"
+
+/* from the changelog translator */
+#include "changelog-misc.h"
+#include "changelog-mem-types.h"
+
+int byebye = 0;
+
+static void
+gf_changelog_cleanup (gf_changelog_t *gfc)
+{
+        /* socket */
+        if (gfc->gfc_sockfd != -1)
+                close (gfc->gfc_sockfd);
+        /* tracker fd */
+        if (gfc->gfc_fd != -1)
+                close (gfc->gfc_fd);
+        /* processing dir */
+        if (gfc->gfc_dir)
+                closedir (gfc->gfc_dir);
+
+        if (gfc->gfc_working_dir)
+                free (gfc->gfc_working_dir); /* allocated by realpath */
+}
+
+void
+__attribute__ ((constructor)) gf_changelog_ctor (void)
+{
+        glusterfs_ctx_t *ctx = NULL;
+
+        ctx = glusterfs_ctx_new ();
+        if (!ctx)
+                return;
+
+        if (glusterfs_globals_init (ctx)) {
+                free (ctx);
+                ctx = NULL;
+                return;
+        }
+
+        THIS->ctx = ctx;
+}
+
+void
+__attribute__ ((destructor)) gf_changelog_dtor (void)
+{
+        xlator_t        *this = NULL;
+        glusterfs_ctx_t *ctx  = NULL;
+        gf_changelog_t  *gfc  = NULL;
+
+        this = THIS;
+        if (!this)
+                return;
+
+        ctx = this->ctx;
+        gfc = this->private;
+
+        if (gfc) {
+                gf_changelog_cleanup (gfc);
+                GF_FREE (gfc);
+        }
+
+        if (ctx) {
+                pthread_mutex_destroy (&ctx->lock);
+                free (ctx);
+                ctx = NULL;
+        }
+}
+
+
+static int
+gf_changelog_open_dirs (gf_changelog_t *gfc)
+{
+        int  ret                    = -1;
+        DIR *dir                    = NULL;
+        int  tracker_fd             = 0;
+        char tracker_path[PATH_MAX] = {0,};
+
+        (void) snprintf (gfc->gfc_current_dir, PATH_MAX,
+                         "%s/"GF_CHANGELOG_CURRENT_DIR"/",
+                         gfc->gfc_working_dir);
+        ret = mkdir_p (gfc->gfc_current_dir, 0600, _gf_false);
+        if (ret)
+                goto out;
+
+        (void) snprintf (gfc->gfc_processed_dir, PATH_MAX,
+                         "%s/"GF_CHANGELOG_PROCESSED_DIR"/",
+                         gfc->gfc_working_dir);
+        ret = mkdir_p (gfc->gfc_processed_dir, 0600, _gf_false);
+        if (ret)
+                goto out;
+
+        (void) snprintf (gfc->gfc_processing_dir, PATH_MAX,
+                         "%s/"GF_CHANGELOG_PROCESSING_DIR"/",
+                         gfc->gfc_working_dir);
+        ret = mkdir_p (gfc->gfc_processing_dir, 0600, _gf_false);
+        if (ret)
+                goto out;
+
+        dir = opendir (gfc->gfc_processing_dir);
+        if (!dir) {
+                gf_log ("", GF_LOG_ERROR,
+                        "opendir() error [reason: %s]", strerror (errno));
+                goto out;
+        }
+
+        gfc->gfc_dir = dir;
+
+        (void) snprintf (tracker_path, PATH_MAX,
+                         "%s/"GF_CHANGELOG_TRACKER, gfc->gfc_working_dir);
+
+        tracker_fd = open (tracker_path, O_CREAT | O_APPEND | O_RDWR,
+                           S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
+        if (tracker_fd < 0) {
+                closedir (gfc->gfc_dir);
+                ret = -1;
+                goto out;
+        }
+
+        gfc->gfc_fd = tracker_fd;
+        ret = 0;
+ out:
+        return ret;
+}
+
+int
+gf_changelog_notification_init (xlator_t *this, gf_changelog_t *gfc)
+{
+        int                ret    = 0;
+        int                len    = 0;
+        int                tries  = 0;
+        int                sockfd = 0;
+        struct sockaddr_un remote;
+
+        this = gfc->this;
+
+        if (gfc->gfc_sockfd != -1) {
+                gf_log (this->name, GF_LOG_INFO,
+                        "Reconnecting...");
+                close (gfc->gfc_sockfd);
+        }
+
+        sockfd = socket (AF_UNIX, SOCK_STREAM, 0);
+        if (sockfd < 0) {
+                ret = -1;
+                goto out;
+        }
+
+        CHANGELOG_MAKE_SOCKET_PATH (gfc->gfc_brickpath,
+                                    gfc->gfc_sockpath, PATH_MAX);
+        gf_log (this->name, GF_LOG_INFO,
+                "connecting to changelog socket: %s (brick: %s)",
+                gfc->gfc_sockpath, gfc->gfc_brickpath);
+
+        remote.sun_family = AF_UNIX;
+        strcpy (remote.sun_path, gfc->gfc_sockpath);
+
+        len = strlen (remote.sun_path) + sizeof (remote.sun_family);
+
+        while (tries < gfc->gfc_connretries) {
+                gf_log (this->name, GF_LOG_WARNING,
+                        "connection attempt %d/%d...",
+                        tries + 1, gfc->gfc_connretries);
+
+                /* initiate a connect */
+                if (connect (sockfd, (struct sockaddr *) &remote, len) == 0) {
+                        gfc->gfc_sockfd = sockfd;
+                        break;
+                }
+
+                tries++;
+                sleep (2);
+        }
+
+        if (tries == gfc->gfc_connretries) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "could not connect to changelog socket!"
+                        " bailing out...");
+                ret = -1;
+        } else
+                gf_log (this->name, GF_LOG_INFO,
+                        "connection successful");
+
+ out:
+        return ret;
+}
+
+int
+gf_changelog_done (char *file)
+{
+        int             ret    = -1;
+        char           *buffer = NULL;
+        xlator_t       *this   = NULL;
+        gf_changelog_t *gfc    = NULL;
+        char to_path[PATH_MAX] = {0,};
+
+        errno = EINVAL;
+
+        this = THIS;
+        if (!this)
+                goto out;
+
+        gfc = (gf_changelog_t *) this->private;
+        if (!gfc)
+                goto out;
+
+        if (!file || !strlen (file))
+                goto out;
+
+        /* make sure 'file' is inside ->gfc_working_dir */
+        buffer = realpath (file, NULL);
+        if (!buffer)
+                goto out;
+
+        if (strncmp (gfc->gfc_working_dir,
+                     buffer, strlen (gfc->gfc_working_dir)))
+                goto out;
+
+        (void) snprintf (to_path, PATH_MAX, "%s%s",
+                         gfc->gfc_processed_dir, basename (buffer));
+        gf_log (this->name, GF_LOG_DEBUG,
+                "moving %s to processed directory", file);
+        ret = rename (buffer, to_path);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "cannot move %s to %s (reason: %s)",
+                        file, to_path, strerror (errno));
+                goto out;
+        }
+
+        ret = 0;
+
+ out:
+        if (buffer)
+                free (buffer); /* allocated by realpath() */
+        return ret;
+}
+
+/**
+ * @API
+ *  for a set of changelogs, start from the begining
+ */
+int
+gf_changelog_start_fresh ()
+{
+        xlator_t *this = NULL;
+        gf_changelog_t *gfc = NULL;
+
+        this = THIS;
+        if (!this)
+                goto out;
+
+        errno = EINVAL;
+
+        gfc = (gf_changelog_t *) this->private;
+        if (!gfc)
+                goto out;
+
+        if (gf_ftruncate (gfc->gfc_fd, 0))
+                goto out;
+
+        return 0;
+
+ out:
+        return -1;
+}
+
+/**
+ * @API
+ * return the next changelog file entry. zero means all chanelogs
+ * consumed.
+ */
+ssize_t
+gf_changelog_next_change (char *bufptr, size_t maxlen)
+{
+        ssize_t         size       = 0;
+        int             tracker_fd = 0;
+        xlator_t       *this       = NULL;
+        gf_changelog_t *gfc        = NULL;
+        char buffer[PATH_MAX]      = {0,};
+
+        errno = EINVAL;
+
+        this = THIS;
+        if (!this)
+                goto out;
+
+        gfc = (gf_changelog_t *) this->private;
+        if (!gfc)
+                goto out;
+
+        tracker_fd = gfc->gfc_fd;
+
+        size = gf_readline (tracker_fd, buffer, maxlen);
+        if (size < 0)
+                goto out;
+        if (size == 0)
+                return 0;
+
+        memcpy (bufptr, buffer, size - 1);
+        *(buffer + size) = '\0';
+
+        return size;
+
+ out:
+        return -1;
+}
+
+/**
+ * @API
+ *  gf_changelog_scan() - scan and generate a list of change entries
+ *
+ * calling this api multiple times (without calling gf_changlog_done())
+ * would result new changelogs(s) being refreshed in the tracker file.
+ * This call also acts as a cancellation point for the consumer.
+ */
+ssize_t
+gf_changelog_scan ()
+{
+        int             ret        = 0;
+        int             tracker_fd = 0;
+        size_t          len        = 0;
+        size_t          off        = 0;
+        xlator_t       *this       = NULL;
+        size_t          nr_entries = 0;
+        gf_changelog_t *gfc        = NULL;
+        struct dirent  *entryp     = NULL;
+        struct dirent  *result     = NULL;
+        char buffer[PATH_MAX]      = {0,};
+
+        this = THIS;
+        if (!this)
+                goto out;
+
+        gfc = (gf_changelog_t *) this->private;
+        if (!gfc)
+                goto out;
+
+        /**
+         * do we need to protect 'byebye' with locks? worst, the
+         * consumer would get notified during next scan().
+         */
+        if (byebye) {
+                errno = ECONNREFUSED;
+                goto out;
+        }
+
+        errno = EINVAL;
+
+        tracker_fd = gfc->gfc_fd;
+
+        if (gf_ftruncate (tracker_fd, 0))
+                goto out;
+
+        len = offsetof(struct dirent, d_name)
+                + pathconf(gfc->gfc_processing_dir, _PC_NAME_MAX) + 1;
+        entryp = GF_CALLOC (1, len,
+                            gf_changelog_mt_libgfchangelog_dirent_t);
+        if (!entryp)
+                goto out;
+
+        rewinddir (gfc->gfc_dir);
+        while (1) {
+                ret = readdir_r (gfc->gfc_dir, entryp, &result);
+                if (ret || !result)
+                        break;
+
+                if ( !strcmp (basename (entryp->d_name), ".")
+                     || !strcmp (basename (entryp->d_name), "..") )
+                        continue;
+
+                nr_entries++;
+
+                GF_CHANGELOG_FILL_BUFFER (gfc->gfc_processing_dir,
+                                          buffer, off,
+                                          strlen (gfc->gfc_processing_dir));
+                GF_CHANGELOG_FILL_BUFFER (entryp->d_name, buffer,
+                                          off, strlen (entryp->d_name));
+                GF_CHANGELOG_FILL_BUFFER ("\n", buffer, off, 1);
+
+                if (gf_changelog_write (tracker_fd, buffer, off) != off) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "error writing changelog filename"
+                                " to tracker file");
+                        break;
+                }
+                off = 0;
+        }
+
+        GF_FREE (entryp);
+
+        if (!result) {
+                if (gf_lseek (tracker_fd, 0, SEEK_SET) != -1)
+                        return nr_entries;
+        }
+ out:
+        return -1;
+}
+
+/**
+ * @API
+ *  gf_changelog_register() - register a client for updates.
+ */
+int
+gf_changelog_register (char *brick_path, char *scratch_dir,
+                       char *log_file, int log_level, int max_reconnects)
+{
+        int             i    = 0;
+        int             ret  = -1;
+        int             errn = 0;
+        xlator_t       *this = NULL;
+        gf_changelog_t *gfc  = NULL;
+
+        this = THIS;
+        if (!this->ctx)
+                goto out;
+
+        errno = ENOMEM;
+
+        gfc = GF_CALLOC (1, sizeof (*gfc),
+                         gf_changelog_mt_libgfchangelog_t);
+        if (!gfc)
+                goto out;
+
+        gfc->this = this;
+
+        gfc->gfc_dir = NULL;
+        gfc->gfc_fd = gfc->gfc_sockfd = -1;
+
+        gfc->gfc_working_dir = realpath (scratch_dir, NULL);
+        if (!gfc->gfc_working_dir) {
+                errn = errno;
+                goto cleanup;
+        }
+
+        ret = gf_changelog_open_dirs (gfc);
+        if (ret) {
+                errn = errno;
+                gf_log (this->name, GF_LOG_ERROR,
+                        "could not create entries in scratch dir");
+                goto cleanup;
+        }
+
+        /* passing ident as NULL means to use default ident for syslog */
+        if (gf_log_init (this->ctx, log_file, NULL))
+                goto cleanup;
+
+        gf_log_set_loglevel ((log_level == -1) ? GF_LOG_INFO :
+                             log_level);
+
+        gfc->gfc_connretries = (max_reconnects <= 0) ? 1 : max_reconnects;
+        (void) strncpy (gfc->gfc_brickpath, brick_path, PATH_MAX);
+
+        ret = gf_changelog_notification_init (this, gfc);
+        if (ret) {
+                errn = errno;
+                goto cleanup;
+        }
+
+        ret = gf_thread_create (&gfc->gfc_changelog_processor,
+				NULL, gf_changelog_process, gfc);
+        if (ret) {
+                errn = errno;
+                gf_log (this->name, GF_LOG_ERROR,
+                        "error creating changelog processor thread"
+                        " new changes won't be recorded!!!");
+                goto cleanup;
+        }
+
+        for (; i < 256; i++) {
+                gfc->rfc3986[i] =
+                        (isalnum(i) || i == '~' ||
+                        i == '-' || i == '.' || i == '_') ? i : 0;
+        }
+
+        ret = 0;
+        this->private = gfc;
+
+        goto out;
+
+ cleanup:
+        gf_changelog_cleanup (gfc);
+        GF_FREE (gfc);
+        this->private = NULL;
+        errno = errn;
+
+ out:
+        return ret;
+}
diff --git a/xlators/features/changelog/src/Makefile.am b/xlators/features/changelog/src/Makefile.am
new file mode 100644
index 000000000..e85031ad4
--- /dev/null
+++ b/xlators/features/changelog/src/Makefile.am
@@ -0,0 +1,19 @@
+xlator_LTLIBRARIES = changelog.la
+
+xlatordir = $(libdir)/glusterfs/$(PACKAGE_VERSION)/xlator/features
+
+noinst_HEADERS = changelog-helpers.h changelog-mem-types.h changelog-rt.h \
+	changelog-misc.h changelog-encoders.h changelog-notifier.h
+
+changelog_la_LDFLAGS = -module -avoidversion
+
+changelog_la_SOURCES = changelog.c changelog-rt.c changelog-helpers.c \
+	changelog-encoders.c changelog-notifier.c
+changelog_la_LIBADD = $(top_builddir)/libglusterfs/src/libglusterfs.la
+
+AM_CPPFLAGS = $(GF_CPPFLAGS) -I$(top_srcdir)/libglusterfs/src -fPIC -D_FILE_OFFSET_BITS=64 \
+	-D_GNU_SOURCE -D$(GF_HOST_OS) -shared -nostartfiles -DDATADIR=\"$(localstatedir)\"
+
+AM_CFLAGS = -Wall $(GF_CFLAGS)
+
+CLEANFILES =
diff --git a/xlators/features/changelog/src/changelog-encoders.c b/xlators/features/changelog/src/changelog-encoders.c
new file mode 100644
index 000000000..553eec85c
--- /dev/null
+++ b/xlators/features/changelog/src/changelog-encoders.c
@@ -0,0 +1,176 @@
+/*
+   Copyright (c) 2013 Red Hat, Inc. <http://www.redhat.com>
+   This file is part of GlusterFS.
+
+   This file is licensed to you under your choice of the GNU Lesser
+   General Public License, version 3 or any later version (LGPLv3 or
+   later), or the GNU General Public License, version 2 (GPLv2), in all
+   cases as published by the Free Software Foundation.
+*/
+
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+
+#include "changelog-encoders.h"
+
+size_t
+entry_fn (void *data, char *buffer, gf_boolean_t encode)
+{
+        char    *tmpbuf = NULL;
+        size_t  bufsz  = 0;
+        struct changelog_entry_fields *ce = NULL;
+
+        ce = (struct changelog_entry_fields *) data;
+
+        if (encode) {
+                tmpbuf = uuid_utoa (ce->cef_uuid);
+                CHANGELOG_FILL_BUFFER (buffer, bufsz, tmpbuf, strlen (tmpbuf));
+        } else {
+                CHANGELOG_FILL_BUFFER (buffer, bufsz,
+                                       ce->cef_uuid, sizeof (uuid_t));
+        }
+
+        CHANGELOG_FILL_BUFFER (buffer, bufsz, "/", 1);
+        CHANGELOG_FILL_BUFFER (buffer, bufsz,
+                               ce->cef_bname, strlen (ce->cef_bname));
+        return bufsz;
+}
+
+size_t
+fop_fn (void *data, char *buffer, gf_boolean_t encode)
+{
+        char buf[10]          = {0,};
+        size_t         bufsz = 0;
+        glusterfs_fop_t fop   = 0;
+
+        fop = *(glusterfs_fop_t *) data;
+
+        if (encode) {
+                (void) snprintf (buf, sizeof (buf), "%d", fop);
+                CHANGELOG_FILL_BUFFER (buffer, bufsz, buf, strlen (buf));
+        } else
+                CHANGELOG_FILL_BUFFER (buffer, bufsz, &fop, sizeof (fop));
+
+        return bufsz;
+}
+
+void
+entry_free_fn (void *data)
+{
+        changelog_opt_t *co = data;
+
+        if (!co)
+                return;
+
+        GF_FREE (co->co_entry.cef_bname);
+}
+
+/**
+ * try to write all data in one shot
+ */
+
+static inline void
+changelog_encode_write_xtra (changelog_log_data_t *cld,
+                             char *buffer, size_t *off, gf_boolean_t encode)
+{
+        int              i      = 0;
+        size_t           offset = 0;
+        void            *data   = NULL;
+        changelog_opt_t *co     = NULL;
+
+        offset = *off;
+
+        co = (changelog_opt_t *) cld->cld_ptr;
+
+        for (; i < cld->cld_xtra_records; i++, co++) {
+                CHANGELOG_FILL_BUFFER (buffer, offset, "\0", 1);
+
+                switch (co->co_type) {
+                case CHANGELOG_OPT_REC_FOP:
+                        data = &co->co_fop;
+                        break;
+                case CHANGELOG_OPT_REC_ENTRY:
+                        data = &co->co_entry;
+                        break;
+                }
+
+                if (co->co_convert)
+                        offset += co->co_convert (data,
+                                                  buffer + offset, encode);
+                else /* no coversion: write it out as it is */
+                        CHANGELOG_FILL_BUFFER (buffer, offset,
+                                               data, co->co_len);
+        }
+
+        *off = offset;
+}
+
+int
+changelog_encode_ascii (xlator_t *this, changelog_log_data_t *cld)
+{
+        size_t            off      = 0;
+        size_t            gfid_len = 0;
+        char             *gfid_str = NULL;
+        char             *buffer   = NULL;
+        changelog_priv_t *priv     = NULL;
+
+        priv = this->private;
+
+        gfid_str = uuid_utoa (cld->cld_gfid);
+        gfid_len = strlen (gfid_str);
+
+        /* extra bytes for decorations */
+        buffer = alloca (gfid_len + cld->cld_ptr_len + 10);
+        CHANGELOG_STORE_ASCII (priv, buffer,
+                               off, gfid_str, gfid_len, cld);
+
+        if (cld->cld_xtra_records)
+                changelog_encode_write_xtra (cld, buffer, &off, _gf_true);
+
+        CHANGELOG_FILL_BUFFER (buffer, off, "\0", 1);
+
+        return changelog_write_change (priv, buffer, off);
+}
+
+int
+changelog_encode_binary (xlator_t *this, changelog_log_data_t *cld)
+{
+        size_t            off    = 0;
+        char             *buffer = NULL;
+        changelog_priv_t *priv   = NULL;
+
+        priv = this->private;
+
+        /* extra bytes for decorations */
+        buffer = alloca (sizeof (uuid_t) + cld->cld_ptr_len + 10);
+        CHANGELOG_STORE_BINARY (priv, buffer, off, cld->cld_gfid, cld);
+
+        if (cld->cld_xtra_records)
+                changelog_encode_write_xtra (cld, buffer, &off, _gf_false);
+
+        CHANGELOG_FILL_BUFFER (buffer, off, "\0", 1);
+
+        return changelog_write_change (priv, buffer, off);
+}
+
+static struct changelog_encoder
+cb_encoder[] = {
+        [CHANGELOG_ENCODE_BINARY] =
+        {
+                .encoder = CHANGELOG_ENCODE_BINARY,
+                .encode = changelog_encode_binary,
+        },
+        [CHANGELOG_ENCODE_ASCII] =
+        {
+                .encoder = CHANGELOG_ENCODE_ASCII,
+                .encode = changelog_encode_ascii,
+        },
+};
+
+void
+changelog_encode_change( changelog_priv_t * priv)
+{
+        priv->ce = &cb_encoder[priv->encode_mode];
+}
diff --git a/xlators/features/changelog/src/changelog-encoders.h b/xlators/features/changelog/src/changelog-encoders.h
new file mode 100644
index 000000000..a3efbee05
--- /dev/null
+++ b/xlators/features/changelog/src/changelog-encoders.h
@@ -0,0 +1,46 @@
+/*
+   Copyright (c) 2013 Red Hat, Inc. <http://www.redhat.com>
+   This file is part of GlusterFS.
+
+   This file is licensed to you under your choice of the GNU Lesser
+   General Public License, version 3 or any later version (LGPLv3 or
+   later), or the GNU General Public License, version 2 (GPLv2), in all
+   cases as published by the Free Software Foundation.
+*/
+
+#ifndef _CHANGELOG_ENCODERS_H
+#define _CHANGELOG_ENCODERS_H
+
+#include "xlator.h"
+#include "defaults.h"
+
+#include "changelog-helpers.h"
+
+#define CHANGELOG_STORE_ASCII(priv, buf, off, gfid, gfid_len, cld) do { \
+                CHANGELOG_FILL_BUFFER (buffer, off,                     \
+                                       priv->maps[cld->cld_type], 1);   \
+                CHANGELOG_FILL_BUFFER (buffer,                          \
+                                       off, gfid, gfid_len);            \
+        } while (0)
+
+#define CHANGELOG_STORE_BINARY(priv, buf, off, gfid, cld) do {          \
+                CHANGELOG_FILL_BUFFER (buffer, off,                     \
+                                       priv->maps[cld->cld_type], 1);   \
+                CHANGELOG_FILL_BUFFER (buffer,                          \
+                                       off, gfid, sizeof (uuid_t));     \
+        } while (0)
+
+size_t
+entry_fn (void *data, char *buffer, gf_boolean_t encode);
+size_t
+fop_fn (void *data, char *buffer, gf_boolean_t encode);
+void
+entry_free_fn (void *data);
+int
+changelog_encode_binary (xlator_t *, changelog_log_data_t *);
+int
+changelog_encode_ascii (xlator_t *, changelog_log_data_t *);
+void
+changelog_encode_change(changelog_priv_t *);
+
+#endif /* _CHANGELOG_ENCODERS_H */
diff --git a/xlators/features/changelog/src/changelog-helpers.c b/xlators/features/changelog/src/changelog-helpers.c
new file mode 100644
index 000000000..7ab0091b5
--- /dev/null
+++ b/xlators/features/changelog/src/changelog-helpers.c
@@ -0,0 +1,693 @@
+/*
+   Copyright (c) 2013 Red Hat, Inc. <http://www.redhat.com>
+   This file is part of GlusterFS.
+
+   This file is licensed to you under your choice of the GNU Lesser
+   General Public License, version 3 or any later version (LGPLv3 or
+   later), or the GNU General Public License, version 2 (GPLv2), in all
+   cases as published by the Free Software Foundation.
+*/
+
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+
+#include "xlator.h"
+#include "defaults.h"
+#include "logging.h"
+#include "iobuf.h"
+
+#include "changelog-helpers.h"
+#include "changelog-mem-types.h"
+
+#include "changelog-encoders.h"
+#include <pthread.h>
+
+void
+changelog_thread_cleanup (xlator_t *this, pthread_t thr_id)
+{
+        int   ret    = 0;
+        void *retval = NULL;
+
+        /* send a cancel request to the thread */
+        ret = pthread_cancel (thr_id);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "could not cancel thread (reason: %s)",
+                        strerror (errno));
+                goto out;
+        }
+
+        ret = pthread_join (thr_id, &retval);
+        if (ret || (retval != PTHREAD_CANCELED)) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "cancel request not adhered as expected"
+                        " (reason: %s)", strerror (errno));
+        }
+
+ out:
+        return;
+}
+
+inline void *
+changelog_get_usable_buffer (changelog_local_t *local)
+{
+        changelog_log_data_t *cld = NULL;
+
+        cld = &local->cld;
+        if (!cld->cld_iobuf)
+                return NULL;
+
+        return cld->cld_iobuf->ptr;
+}
+
+inline void
+changelog_set_usable_record_and_length (changelog_local_t *local,
+                                        size_t len, int xr)
+{
+        changelog_log_data_t *cld = NULL;
+
+        cld = &local->cld;
+
+        cld->cld_ptr_len = len;
+        cld->cld_xtra_records = xr;
+}
+
+void
+changelog_local_cleanup (xlator_t *xl, changelog_local_t *local)
+{
+        int                   i   = 0;
+        changelog_opt_t      *co  = NULL;
+        changelog_log_data_t *cld = NULL;
+
+        if (!local)
+                return;
+
+        cld = &local->cld;
+
+        /* cleanup dynamic allocation for extra records */
+        if (cld->cld_xtra_records) {
+                co = (changelog_opt_t *) cld->cld_ptr;
+                for (; i < cld->cld_xtra_records; i++, co++)
+                        if (co->co_free)
+                                co->co_free (co);
+        }
+
+        CHANGELOG_IOBUF_UNREF (cld->cld_iobuf);
+
+        if (local->inode)
+                inode_unref (local->inode);
+
+        mem_put (local);
+}
+
+inline int
+changelog_write (int fd, char *buffer, size_t len)
+{
+        ssize_t size = 0;
+        size_t writen = 0;
+
+        while (writen < len) {
+                size = write (fd,
+                              buffer + writen, len - writen);
+                if (size <= 0)
+                        break;
+
+                writen += size;
+        }
+
+        return (writen != len);
+}
+
+static int
+changelog_rollover_changelog (xlator_t *this,
+                              changelog_priv_t *priv, unsigned long ts)
+{
+        int   ret            = -1;
+        int   notify         = 0;
+        char *bname          = NULL;
+        char ofile[PATH_MAX] = {0,};
+        char nfile[PATH_MAX] = {0,};
+
+        if (priv->changelog_fd != -1) {
+                close (priv->changelog_fd);
+                priv->changelog_fd = -1;
+        }
+
+        (void) snprintf (ofile, PATH_MAX,
+                         "%s/"CHANGELOG_FILE_NAME, priv->changelog_dir);
+        (void) snprintf (nfile, PATH_MAX,
+                         "%s/"CHANGELOG_FILE_NAME".%lu",
+                         priv->changelog_dir, ts);
+
+        ret = rename (ofile, nfile);
+        if (!ret)
+                notify = 1;
+
+        if (ret && (errno == ENOENT)) {
+                ret = 0;
+        }
+
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "error renaming %s -> %s (reason %s)",
+                        ofile, nfile, strerror (errno));
+        }
+
+        if (notify) {
+                bname = basename (nfile);
+                gf_log (this->name, GF_LOG_DEBUG, "notifying: %s", bname);
+                ret = changelog_write (priv->wfd, bname, strlen (bname) + 1);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Failed to send file name to notify thread"
+                                " (reason: %s)", strerror (errno));
+                }
+        }
+
+        return ret;
+}
+
+int
+changelog_open (xlator_t *this,
+                changelog_priv_t *priv)
+{
+        int fd                        = 0;
+        int ret                       = -1;
+        int flags                     = 0;
+        char buffer[1024]             = {0,};
+        char changelog_path[PATH_MAX] = {0,};
+
+        (void) snprintf (changelog_path, PATH_MAX,
+                         "%s/"CHANGELOG_FILE_NAME,
+                         priv->changelog_dir);
+
+        flags |= (O_CREAT | O_RDWR);
+        if (priv->fsync_interval == 0)
+                flags |= O_SYNC;
+
+        fd = open (changelog_path, flags,
+                   S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
+        if (fd < 0) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "unable to open/create changelog file %s"
+                        " (reason: %s). change-logging will be"
+                        " inactive", changelog_path, strerror (errno));
+                goto out;
+        }
+
+        priv->changelog_fd = fd;
+
+        (void) snprintf (buffer, 1024, CHANGELOG_HEADER,
+                         CHANGELOG_VERSION_MAJOR,
+                         CHANGELOG_VERSION_MINOR,
+                         priv->ce->encoder);
+        ret = changelog_write_change (priv, buffer, strlen (buffer));
+        if (ret) {
+                close (priv->changelog_fd);
+                priv->changelog_fd = -1;
+                goto out;
+        }
+
+        ret = 0;
+
+ out:
+        return ret;
+}
+
+int
+changelog_start_next_change (xlator_t *this,
+                             changelog_priv_t *priv,
+                             unsigned long ts, gf_boolean_t finale)
+{
+        int ret = -1;
+
+        ret = changelog_rollover_changelog (this, priv, ts);
+
+        if (!ret && !finale)
+                ret = changelog_open (this, priv);
+
+        return ret;
+}
+
+/**
+ * return the length of entry
+ */
+inline size_t
+changelog_entry_length ()
+{
+        return sizeof (changelog_log_data_t);
+}
+
+int
+changelog_fill_rollover_data (changelog_log_data_t *cld, gf_boolean_t is_last)
+{
+        struct timeval tv = {0,};
+
+        cld->cld_type = CHANGELOG_TYPE_ROLLOVER;
+
+        if (gettimeofday (&tv, NULL))
+                return -1;
+
+        cld->cld_roll_time = (unsigned long) tv.tv_sec;
+        cld->cld_finale = is_last;
+        return 0;
+}
+
+int
+changelog_write_change (changelog_priv_t *priv, char *buffer, size_t len)
+{
+        return changelog_write (priv->changelog_fd, buffer, len);
+}
+
+inline int
+changelog_handle_change (xlator_t *this,
+                         changelog_priv_t *priv, changelog_log_data_t *cld)
+{
+        int ret = 0;
+
+        if (CHANGELOG_TYPE_IS_ROLLOVER (cld->cld_type)) {
+                changelog_encode_change(priv);
+                ret = changelog_start_next_change (this, priv,
+                                                   cld->cld_roll_time,
+                                                   cld->cld_finale);
+                if (ret)
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Problem rolling over changelog(s)");
+                goto out;
+        }
+
+        /**
+         * case when there is reconfigure done (disabling changelog) and there
+         * are still fops that have updates in prgress.
+         */
+        if (priv->changelog_fd == -1)
+                return 0;
+
+        if (CHANGELOG_TYPE_IS_FSYNC (cld->cld_type)) {
+                ret = fsync (priv->changelog_fd);
+                if (ret < 0) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "fsync failed (reason: %s)",
+                                strerror (errno));
+                }
+                goto out;
+        }
+
+        ret = priv->ce->encode (this, cld);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "error writing changelog to disk");
+        }
+
+ out:
+        return ret;
+}
+
+changelog_local_t *
+changelog_local_init (xlator_t *this, inode_t *inode,
+                      uuid_t gfid, int xtra_records,
+                      gf_boolean_t update_flag)
+{
+        changelog_local_t *local = NULL;
+        struct iobuf      *iobuf = NULL;
+
+        /**
+         * We relax the presence of inode if @update_flag is true.
+         * The caller (implmentation of the fop) needs to be careful to
+         * not blindly use local->inode.
+         */
+        if (!update_flag && !inode) {
+                gf_log_callingfn (this->name, GF_LOG_WARNING,
+                                  "inode needed for version checking !!!");
+                goto out;
+        }
+
+        if (xtra_records) {
+                iobuf = iobuf_get2 (this->ctx->iobuf_pool,
+                                    xtra_records * CHANGELOG_OPT_RECORD_LEN);
+                if (!iobuf)
+                        goto out;
+        }
+
+        local = mem_get0 (this->local_pool);
+        if (!local) {
+                CHANGELOG_IOBUF_UNREF (iobuf);
+                goto out;
+        }
+
+        local->update_no_check = update_flag;
+
+        uuid_copy (local->cld.cld_gfid, gfid);
+
+        local->cld.cld_iobuf = iobuf;
+        local->cld.cld_xtra_records = 0; /* set by the caller */
+
+        if (inode)
+                local->inode = inode_ref (inode);
+
+ out:
+        return local;
+}
+
+int
+changelog_forget (xlator_t *this, inode_t *inode)
+{
+        uint64_t ctx_addr = 0;
+        changelog_inode_ctx_t *ctx = NULL;
+
+        inode_ctx_del (inode, this, &ctx_addr);
+        if (!ctx_addr)
+                return 0;
+
+        ctx = (changelog_inode_ctx_t *) (long) ctx_addr;
+        GF_FREE (ctx);
+
+        return 0;
+}
+
+int
+changelog_inject_single_event (xlator_t *this,
+                               changelog_priv_t *priv,
+                               changelog_log_data_t *cld)
+{
+        return priv->cd.dispatchfn (this, priv, priv->cd.cd_data, cld, NULL);
+}
+
+/**
+ * TODO: these threads have many thing in common (wake up after
+ * a certain time etc..). move them into separate routine.
+ */
+void *
+changelog_rollover (void *data)
+{
+        int                     ret   = 0;
+        xlator_t               *this  = NULL;
+        struct timeval          tv    = {0,};
+        changelog_log_data_t    cld   = {0,};
+        changelog_time_slice_t *slice = NULL;
+        changelog_priv_t       *priv  = data;
+
+        this = priv->cr.this;
+        slice = &priv->slice;
+
+        while (1) {
+                tv.tv_sec  = priv->rollover_time;
+                tv.tv_usec = 0;
+
+                ret = select (0, NULL, NULL, NULL, &tv);
+                if (ret)
+                        continue;
+
+                ret = changelog_fill_rollover_data (&cld, _gf_false);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "failed to fill rollover data");
+                        continue;
+                }
+
+                LOCK (&priv->lock);
+                {
+                        ret = changelog_inject_single_event (this, priv, &cld);
+                        if (!ret)
+                                SLICE_VERSION_UPDATE (slice);
+                }
+                UNLOCK (&priv->lock);
+        }
+
+        return NULL;
+}
+
+void *
+changelog_fsync_thread (void *data)
+{
+        int                   ret  = 0;
+        xlator_t             *this = NULL;
+        struct timeval        tv   = {0,};
+        changelog_log_data_t  cld  = {0,};
+        changelog_priv_t     *priv = data;
+
+        this = priv->cf.this;
+        cld.cld_type = CHANGELOG_TYPE_FSYNC;
+
+        while (1) {
+                tv.tv_sec  = priv->fsync_interval;
+                tv.tv_usec = 0;
+
+                ret = select (0, NULL, NULL, NULL, &tv);
+                if (ret)
+                        continue;
+
+                ret = changelog_inject_single_event (this, priv, &cld);
+                if (ret)
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "failed to inject fsync event");
+        }
+
+        return NULL;
+}
+
+/* macros for inode/changelog version checks */
+
+#define INODE_VERSION_UPDATE(priv, inode, iver, slice, type) do {       \
+                LOCK (&inode->lock);                                    \
+                {                                                       \
+                        LOCK (&priv->lock);                             \
+                        {                                               \
+                                *iver = slice->changelog_version[type]; \
+                        }                                               \
+                        UNLOCK (&priv->lock);                           \
+                }                                                       \
+                UNLOCK (&inode->lock);                                  \
+        } while (0)
+
+#define INODE_VERSION_EQUALS_SLICE(priv, ver, slice, type, upd) do {    \
+                LOCK (&priv->lock);                                     \
+                {                                                       \
+                        upd = (ver == slice->changelog_version[type])   \
+                                ? _gf_false : _gf_true;                 \
+                }                                                       \
+                UNLOCK (&priv->lock);                                   \
+        } while (0)
+
+static int
+__changelog_inode_ctx_set (xlator_t *this,
+                           inode_t *inode, changelog_inode_ctx_t *ctx)
+{
+        uint64_t ctx_addr = (uint64_t) ctx;
+        return __inode_ctx_set (inode, this, &ctx_addr);
+}
+
+/**
+ * one shot routine to get the address and the value of a inode version
+ * for a particular type.
+ */
+static changelog_inode_ctx_t *
+__changelog_inode_ctx_get (xlator_t *this,
+                           inode_t *inode, unsigned long **iver,
+                           unsigned long *version, changelog_log_type type)
+{
+        int                    ret      = 0;
+        uint64_t               ctx_addr = 0;
+        changelog_inode_ctx_t *ctx      = NULL;
+
+        ret = __inode_ctx_get (inode, this, &ctx_addr);
+        if (ret < 0)
+                ctx_addr = 0;
+        if (ctx_addr != 0) {
+                ctx = (changelog_inode_ctx_t *) (long)ctx_addr;
+                goto out;
+        }
+
+        ctx = GF_CALLOC (1, sizeof (*ctx), gf_changelog_mt_inode_ctx_t);
+        if (!ctx)
+                goto out;
+
+        ret = __changelog_inode_ctx_set (this, inode, ctx);
+        if (ret) {
+                GF_FREE (ctx);
+                ctx = NULL;
+        }
+
+ out:
+        if (ctx && iver && version) {
+                *iver = CHANGELOG_INODE_VERSION_TYPE (ctx, type);
+                *version = **iver;
+        }
+
+        return ctx;
+}
+
+static changelog_inode_ctx_t *
+changelog_inode_ctx_get (xlator_t *this,
+                         inode_t *inode, unsigned long **iver,
+                         unsigned long *version, changelog_log_type type)
+{
+        changelog_inode_ctx_t *ctx = NULL;
+
+        LOCK (&inode->lock);
+        {
+                ctx = __changelog_inode_ctx_get (this,
+                                                 inode, iver, version, type);
+        }
+        UNLOCK (&inode->lock);
+
+        return ctx;
+}
+
+/**
+ * This is the main update routine. Locking has been made granular so as to
+ * maximize parallelism of fops - I'll try to explain it below using execution
+ * timelines.
+ *
+ * Basically, the contention is between multiple execution threads of this
+ * routine and the roll-over thread. So, instead of having a big lock, we hold
+ * granular locks: inode->lock and priv->lock. Now I'll explain what happens
+ * when there is an update and a roll-over at just about the same time.
+ * NOTE:
+ *  - the dispatcher itself synchronizes updates via it's own lock
+ *  - the slice version in incremented by the roll-over thread
+ *
+ * Case 1: When the rollover thread wins before the inode version can be
+ * compared with the slice version.
+ *
+ *          [updater]                 |             [rollover]
+ *                                    |
+ *                                    |           <SLICE: 1, 1, 1>
+ * <changelog_update>                 |
+ *   <changelog_inode_ctx_get>        |
+ *      <CTX: 1, 1, 1>                |
+ *                                    |         <dispatch-rollover-event>
+ *                                    |         LOCK (&priv->lock)
+ *                                    |            <SLICE_VERSION_UPDATE>
+ *                                    |              <SLICE: 2, 2, 2>
+ *                                    |         UNLOCK (&priv->lock)
+ *                                    |
+ * LOCK (&priv->lock)                 |
+ *   <INODE_VERSION_EQUALS_SLICE>     |
+ *    I: 1 <-> S: 2                   |
+ *    update: true                    |
+ * UNLOCK (&priv->lock)               |
+ *                                    |
+ * <if update == true>                |
+ *  <dispath-update-event>            |
+ *  <INODE_VERSION_UPDATE>            |
+ *   LOCK (&inode->lock)              |
+ *    LOCK (&priv->lock)              |
+ *     <CTX: 2, 1, 1>                 |
+ *    UNLOCK (&priv->lock)            |
+ *   UNLOCK (&inode->lock)            |
+ *
+ * Therefore, the change gets recorded in the next change (no lost change). If
+ * the slice version was ahead of the inode version (say I:1, S: 2), then
+ * anyway the comparison would result in a update (I: 1, S: 3).
+ *
+ * If the rollover time is too less, then there is another contention when the
+ * updater tries to bring up inode version to the slice version (this is also
+ * the case when the roll-over thread wakes up during INODE_VERSION_UPDATE.
+ *
+ *   <CTX: 1, 1, 1>                   |       <SLICE: 2, 2, 2>
+ *                                    |
+ *                                    |
+ * <dispath-update-event>             |
+ * <INODE_VERSION_UPDATE>             |
+ *  LOCK (&inode->lock)               |
+ *   LOCK (&priv->lock)               |
+ *    <CTX: 2, 1, 1>                  |
+ *   UNLOCK (&priv->lock)             |
+ *  UNLOCK (&inode->lock)             |
+ *                                    |         <dispatch-rollover-event>
+ *                                    |         LOCK (&priv->lock)
+ *                                    |            <SLICE_VERSION_UPDATE>
+ *                                    |              <SLICE: 3, 3, 3>
+ *                                    |         UNLOCK (&priv->lock)
+ *
+ *
+ * Case 2: When the fop thread wins
+ *
+ *          [updater]                 |             [rollover]
+ *                                    |
+ *                                    |           <SLICE: 1, 1, 1>
+ * <changelog_update>                 |
+ *   <changelog_inode_ctx_get>        |
+ *      <CTX: 0, 0, 0>                |
+ *                                    |
+ * LOCK (&priv->lock)                 |
+ *   <INODE_VERSION_EQUALS_SLICE>     |
+ *    I: 0 <-> S: 1                   |
+ *    update: true                    |
+ * UNLOCK (&priv->lock)               |
+ *                                    |         <dispatch-rollover-event>
+ *                                    |         LOCK (&priv->lock)
+ *                                    |            <SLICE_VERSION_UPDATE>
+ *                                    |              <SLICE: 2, 2, 2>
+ *                                    |         UNLOCK (&priv->lock)
+ * <if update == true>                |
+ *  <dispath-update-event>            |
+ *  <INODE_VERSION_UPDATE>            |
+ *   LOCK (&inode->lock)              |
+ *    LOCK (&priv->lock)              |
+ *     <CTX: 2, 0, 0>                 |
+ *    UNLOCK (&priv->lock)            |
+ *   UNLOCK (&inode->lock)            |
+ *
+ * Here again, if the inode version was equal to the slice version (I: 1, S: 1)
+ * then there is no need to record an update (as the equality of the two version
+ * signifies an update was recorded in the current time slice).
+ */
+inline void
+changelog_update (xlator_t *this, changelog_priv_t *priv,
+                  changelog_local_t *local, changelog_log_type type)
+{
+        int                     ret        = 0;
+        unsigned long          *iver       = NULL;
+        unsigned long           version    = 0;
+        inode_t                *inode      = NULL;
+        changelog_time_slice_t *slice      = NULL;
+        changelog_inode_ctx_t  *ctx        = NULL;
+        changelog_log_data_t   *cld_0      = NULL;
+        changelog_log_data_t   *cld_1      = NULL;
+        changelog_local_t      *next_local = NULL;
+        gf_boolean_t            need_upd   = _gf_true;
+
+        slice = &priv->slice;
+
+        /**
+         * for fops that do not require inode version checking
+         */
+        if (local->update_no_check)
+                goto update;
+
+        inode = local->inode;
+
+        ctx = changelog_inode_ctx_get (this,
+                                       inode, &iver, &version, type);
+        if (!ctx)
+                goto update;
+
+        INODE_VERSION_EQUALS_SLICE (priv, version, slice, type, need_upd);
+
+ update:
+        if (need_upd) {
+                cld_0 = &local->cld;
+                cld_0->cld_type = type;
+
+                if ( (next_local = local->prev_entry) != NULL ) {
+                        cld_1 = &next_local->cld;
+                        cld_1->cld_type = type;
+                }
+
+                ret = priv->cd.dispatchfn (this, priv,
+                                           priv->cd.cd_data, cld_0, cld_1);
+
+                /**
+                 * update after the dispatcher has successfully done
+                 * it's job.
+                 */
+                if (!local->update_no_check && iver && !ret)
+                        INODE_VERSION_UPDATE (priv, inode, iver, slice, type);
+        }
+
+        return;
+}
diff --git a/xlators/features/changelog/src/changelog-helpers.h b/xlators/features/changelog/src/changelog-helpers.h
new file mode 100644
index 000000000..ad79636b0
--- /dev/null
+++ b/xlators/features/changelog/src/changelog-helpers.h
@@ -0,0 +1,395 @@
+/*
+   Copyright (c) 2013 Red Hat, Inc. <http://www.redhat.com>
+   This file is part of GlusterFS.
+
+   This file is licensed to you under your choice of the GNU Lesser
+   General Public License, version 3 or any later version (LGPLv3 or
+   later), or the GNU General Public License, version 2 (GPLv2), in all
+   cases as published by the Free Software Foundation.
+*/
+
+#ifndef _CHANGELOG_HELPERS_H
+#define _CHANGELOG_HELPERS_H
+
+#include "locking.h"
+#include "timer.h"
+#include "pthread.h"
+#include "iobuf.h"
+
+#include "changelog-misc.h"
+
+/**
+ * the changelog entry
+ */
+typedef struct changelog_log_data {
+        /* rollover related */
+        unsigned long cld_roll_time;
+
+        /* reopen changelog? */
+        gf_boolean_t cld_finale;
+
+        changelog_log_type cld_type;
+
+        /**
+         * sincd gfid is _always_ a necessity, it's not a part
+         * of the iobuf. by doing this we do not add any overhead
+         * for data and metadata related fops.
+         */
+        uuid_t        cld_gfid;
+
+        /**
+         * iobufs are used for optionals records: pargfid, path,
+         * write offsets etc.. It's the fop implementers job
+         * to allocate (iobuf_get() in the fop) and get unref'ed
+         * in the callback (CHANGELOG_STACK_UNWIND).
+         */
+        struct iobuf *cld_iobuf;
+
+#define cld_ptr cld_iobuf->ptr
+
+        /**
+         * after allocation you can point this to the length of
+         * usable data, but make sure it does not exceed the
+         * the size of the requested iobuf.
+         */
+        size_t        cld_iobuf_len;
+
+#define cld_ptr_len cld_iobuf_len
+
+        /**
+         * number of optional records
+         */
+        int cld_xtra_records;
+} changelog_log_data_t;
+
+/**
+ * holder for dispatch function and private data
+ */
+
+typedef struct changelog_priv changelog_priv_t;
+
+typedef struct changelog_dispatcher {
+        void *cd_data;
+        int (*dispatchfn) (xlator_t *, changelog_priv_t *, void *,
+                           changelog_log_data_t *, changelog_log_data_t *);
+} changelog_dispatcher_t;
+
+struct changelog_bootstrap {
+        changelog_mode_t mode;
+        int (*ctor) (xlator_t *, changelog_dispatcher_t *);
+        int (*dtor) (xlator_t *, changelog_dispatcher_t *);
+};
+
+struct changelog_encoder {
+        changelog_encoder_t encoder;
+        int (*encode) (xlator_t *, changelog_log_data_t *);
+};
+
+
+/* xlator private */
+
+typedef struct changelog_time_slice {
+        /**
+         * just in case we need nanosecond granularity some day.
+         * field is unused as of now (maybe we'd need it later).
+         */
+        struct timeval tv_start;
+
+        /**
+         * version of changelog file, incremented each time changes
+         * rollover.
+         */
+        unsigned long changelog_version[CHANGELOG_MAX_TYPE];
+} changelog_time_slice_t;
+
+typedef struct changelog_rollover {
+        /* rollover thread */
+        pthread_t rollover_th;
+
+        xlator_t *this;
+} changelog_rollover_t;
+
+typedef struct changelog_fsync {
+        /* fsync() thread */
+        pthread_t fsync_th;
+
+        xlator_t *this;
+} changelog_fsync_t;
+
+# define CHANGELOG_MAX_CLIENTS  5
+typedef struct changelog_notify {
+        /* reader end of the pipe */
+        int rfd;
+
+        /* notifier thread */
+        pthread_t notify_th;
+
+        /* unique socket path */
+        char sockpath[PATH_MAX];
+
+        int socket_fd;
+
+        /**
+         * simple array of accept()'ed fds. Not scalable at all
+         * for large number of clients, but it's okay as we have
+         * a ahrd limit in this version (@CHANGELOG_MAX_CLIENTS).
+         */
+        int client_fd[CHANGELOG_MAX_CLIENTS];
+
+        xlator_t *this;
+} changelog_notify_t;
+
+struct changelog_priv {
+        gf_boolean_t active;
+
+        /* to generate unique socket file per brick */
+        char *changelog_brick;
+
+        /* logging directory */
+        char *changelog_dir;
+
+        /* one file for all changelog types */
+        int changelog_fd;
+
+        gf_lock_t lock;
+
+        /* writen end of the pipe */
+        int wfd;
+
+        /* rollover time */
+        int32_t rollover_time;
+
+        /* fsync() interval */
+        int32_t fsync_interval;
+
+        /* changelog type maps */
+        const char *maps[CHANGELOG_MAX_TYPE];
+
+        /* time slicer */
+        changelog_time_slice_t slice;
+
+        /* context of the updater */
+        changelog_dispatcher_t cd;
+
+        /* context of the rollover thread */
+        changelog_rollover_t cr;
+
+        /* context of fsync thread */
+        changelog_fsync_t cf;
+
+        /* context of the notifier thread */
+        changelog_notify_t cn;
+
+        /* operation mode */
+        changelog_mode_t op_mode;
+
+        /* bootstrap routine for 'current' logger */
+        struct changelog_bootstrap *cb;
+
+        /* encoder mode */
+        changelog_encoder_t encode_mode;
+
+        /* encoder */
+        struct changelog_encoder *ce;
+};
+
+struct changelog_local {
+        inode_t              *inode;
+        gf_boolean_t          update_no_check;
+
+        changelog_log_data_t  cld;
+
+        /**
+         * ->prev_entry is used in cases when there needs to be
+         * additional changelog entry for the parent (eg. rename)
+         * It's analogous to ->next in single linked list world,
+         * but we call it as ->prev_entry... ha ha ha
+         */
+        struct changelog_local *prev_entry;
+};
+
+typedef struct changelog_local changelog_local_t;
+
+/* inode version is stored in inode ctx */
+typedef struct changelog_inode_ctx {
+        unsigned long iversion[CHANGELOG_MAX_TYPE];
+} changelog_inode_ctx_t;
+
+#define CHANGELOG_INODE_VERSION_TYPE(ctx, type)  &(ctx->iversion[type])
+
+/**
+ * Optional Records:
+ *  fops that need to save additional information request a array of
+ *  @changelog_opt_t struct. The array is allocated via @iobufs.
+ */
+typedef enum {
+        CHANGELOG_OPT_REC_FOP,
+        CHANGELOG_OPT_REC_ENTRY,
+} changelog_optional_rec_type_t;
+
+struct changelog_entry_fields {
+        uuid_t  cef_uuid;
+        char   *cef_bname;
+};
+
+typedef struct {
+        /**
+         * @co_covert can be used to do post-processing of the record before
+         * it's persisted to the CHANGELOG. If this is NULL, then the record
+         * is persisted as per it's in memory format.
+         */
+        size_t (*co_convert) (void *data, char *buffer, gf_boolean_t encode);
+
+        /* release routines */
+        void (*co_free) (void *data);
+
+        /* type of the field */
+        changelog_optional_rec_type_t co_type;
+
+        /**
+         * sizeof of the 'valid' field in the union. This field is not used if
+         * @co_convert is specified.
+         */
+        size_t co_len;
+
+        union {
+                glusterfs_fop_t co_fop;
+                struct changelog_entry_fields co_entry;
+        };
+} changelog_opt_t;
+
+#define CHANGELOG_OPT_RECORD_LEN  sizeof (changelog_opt_t)
+
+/**
+ * helpers routines
+ */
+
+void
+changelog_thread_cleanup (xlator_t *this, pthread_t thr_id);
+inline void *
+changelog_get_usable_buffer (changelog_local_t *local);
+inline void
+changelog_set_usable_record_and_length (changelog_local_t *local,
+                                        size_t len, int xr);
+void
+changelog_local_cleanup (xlator_t *xl, changelog_local_t *local);
+changelog_local_t *
+changelog_local_init (xlator_t *this, inode_t *inode, uuid_t gfid,
+                      int xtra_records, gf_boolean_t update_flag);
+int
+changelog_start_next_change (xlator_t *this,
+                             changelog_priv_t *priv,
+                             unsigned long ts, gf_boolean_t finale);
+int
+changelog_open (xlator_t *this, changelog_priv_t *priv);
+int
+changelog_fill_rollover_data (changelog_log_data_t *cld, gf_boolean_t is_last);
+int
+changelog_inject_single_event (xlator_t *this,
+                               changelog_priv_t *priv,
+                               changelog_log_data_t *cld);
+inline size_t
+changelog_entry_length ();
+inline int
+changelog_write (int fd, char *buffer, size_t len);
+int
+changelog_write_change (changelog_priv_t *priv, char *buffer, size_t len);
+inline int
+changelog_handle_change (xlator_t *this,
+                         changelog_priv_t *priv, changelog_log_data_t *cld);
+inline void
+changelog_update (xlator_t *this, changelog_priv_t *priv,
+                  changelog_local_t *local, changelog_log_type type);
+void *
+changelog_rollover (void *data);
+void *
+changelog_fsync_thread (void *data);
+int
+changelog_forget (xlator_t *this, inode_t *inode);
+
+/* macros */
+
+#define CHANGELOG_STACK_UNWIND(fop, frame, params ...) do {             \
+                changelog_local_t *__local = NULL;                      \
+                xlator_t          *__xl    = NULL;                      \
+                if (frame) {                                            \
+                        __local      = frame->local;                    \
+                        __xl         = frame->this;                     \
+                        frame->local = NULL;                            \
+                }                                                       \
+                STACK_UNWIND_STRICT (fop, frame, params);               \
+                changelog_local_cleanup (__xl, __local);                \
+                if (__local && __local->prev_entry)                     \
+                        changelog_local_cleanup (__xl,                  \
+                                                 __local->prev_entry);  \
+        } while (0)
+
+#define CHANGELOG_IOBUF_REF(iobuf) do {         \
+                if (iobuf)                      \
+                        iobuf_ref (iobuf);      \
+        } while (0)
+
+#define CHANGELOG_IOBUF_UNREF(iobuf) do {       \
+                if (iobuf)                      \
+                        iobuf_unref (iobuf);    \
+        } while (0)
+
+#define CHANGELOG_FILL_BUFFER(buffer, off, val, len) do {       \
+                memcpy (buffer + off, val, len);                \
+                off += len;                                     \
+        } while (0)
+
+#define SLICE_VERSION_UPDATE(slice) do {                \
+                int i = 0;                              \
+                for (; i < CHANGELOG_MAX_TYPE; i++) {   \
+                        slice->changelog_version[i]++;  \
+                }                                       \
+        } while (0)
+
+#define CHANGLOG_FILL_FOP_NUMBER(co, fop, converter, xlen) do { \
+                co->co_convert = converter;                     \
+                co->co_free = NULL;                             \
+                co->co_type = CHANGELOG_OPT_REC_FOP;            \
+                co->co_fop = fop;                               \
+                xlen += sizeof (fop);                           \
+        } while (0)
+
+#define CHANGELOG_FILL_ENTRY(co, pargfid, bname,                        \
+                             converter, freefn, xlen, label)            \
+        do {                                                            \
+                co->co_convert = converter;                             \
+                co->co_free = freefn;                                   \
+                co->co_type = CHANGELOG_OPT_REC_ENTRY;                  \
+                uuid_copy (co->co_entry.cef_uuid, pargfid);             \
+                co->co_entry.cef_bname = gf_strdup(bname);              \
+                if (!co->co_entry.cef_bname)                            \
+                        goto label;                                     \
+                xlen += (UUID_CANONICAL_FORM_LEN + strlen (bname));     \
+        } while (0)
+
+#define CHANGELOG_INIT(this, local, inode, gfid, xrec)                  \
+        local = changelog_local_init (this, inode, gfid, xrec, _gf_false)
+
+#define CHANGELOG_INIT_NOCHECK(this, local, inode, gfid, xrec)          \
+        local = changelog_local_init (this, inode, gfid, xrec, _gf_true)
+
+#define CHANGELOG_NOT_ACTIVE_THEN_GOTO(frame, priv, label) do { \
+                if (!priv->active)                              \
+                        goto label;                             \
+                /* ignore rebalance process's activity. */      \
+                if (frame->root->pid == GF_CLIENT_PID_DEFRAG)   \
+                        goto label;                             \
+        } while (0)
+
+/* ignore internal fops */
+#define CHANGELOG_IF_INTERNAL_FOP_THEN_GOTO(dict, label) do {           \
+                if (dict && dict_get (dict, GLUSTERFS_INTERNAL_FOP_KEY)) \
+                        goto label;                                     \
+        } while (0)
+
+#define CHANGELOG_COND_GOTO(priv, cond, label) do {                    \
+                if (!priv->active || cond)                             \
+                        goto label;                                    \
+        } while (0)
+
+#endif /* _CHANGELOG_HELPERS_H */
diff --git a/xlators/features/changelog/src/changelog-mem-types.h b/xlators/features/changelog/src/changelog-mem-types.h
new file mode 100644
index 000000000..d72464eab
--- /dev/null
+++ b/xlators/features/changelog/src/changelog-mem-types.h
@@ -0,0 +1,29 @@
+/*
+   Copyright (c) 2013 Red Hat, Inc. <http://www.redhat.com>
+   This file is part of GlusterFS.
+
+   This file is licensed to you under your choice of the GNU Lesser
+   General Public License, version 3 or any later version (LGPLv3 or
+   later), or the GNU General Public License, version 2 (GPLv2), in all
+   cases as published by the Free Software Foundation.
+*/
+
+#ifndef _CHANGELOG_MEM_TYPES_H
+#define _CHANGELOG_MEM_TYPES_H
+
+#include "mem-types.h"
+
+enum gf_changelog_mem_types {
+        gf_changelog_mt_priv_t                  = gf_common_mt_end + 1,
+        gf_changelog_mt_str_t                   = gf_common_mt_end + 2,
+        gf_changelog_mt_batch_t                 = gf_common_mt_end + 3,
+        gf_changelog_mt_rt_t                    = gf_common_mt_end + 4,
+        gf_changelog_mt_inode_ctx_t             = gf_common_mt_end + 5,
+        gf_changelog_mt_libgfchangelog_t        = gf_common_mt_end + 6,
+        gf_changelog_mt_libgfchangelog_rl_t     = gf_common_mt_end + 7,
+        gf_changelog_mt_libgfchangelog_dirent_t = gf_common_mt_end + 8,
+        gf_changelog_mt_changelog_buffer_t      = gf_common_mt_end + 9,
+        gf_changelog_mt_end
+};
+
+#endif
diff --git a/xlators/features/changelog/src/changelog-misc.h b/xlators/features/changelog/src/changelog-misc.h
new file mode 100644
index 000000000..0712a3771
--- /dev/null
+++ b/xlators/features/changelog/src/changelog-misc.h
@@ -0,0 +1,101 @@
+/*
+   Copyright (c) 2013 Red Hat, Inc. <http://www.redhat.com>
+   This file is part of GlusterFS.
+
+   This file is licensed to you under your choice of the GNU Lesser
+   General Public License, version 3 or any later version (LGPLv3 or
+   later), or the GNU General Public License, version 2 (GPLv2), in all
+   cases as published by the Free Software Foundation.
+*/
+
+#ifndef _CHANGELOG_MISC_H
+#define _CHANGELOG_MISC_H
+
+#include "glusterfs.h"
+#include "common-utils.h"
+
+#define CHANGELOG_MAX_TYPE  3
+#define CHANGELOG_FILE_NAME "CHANGELOG"
+
+#define CHANGELOG_VERSION_MAJOR  1
+#define CHANGELOG_VERSION_MINOR  0
+
+#define CHANGELOG_UNIX_SOCK  DEFAULT_VAR_RUN_DIRECTORY"/changelog-%s.sock"
+
+/**
+ * header starts with the version and the format of the changelog.
+ * 'version' not much of a use now.
+ */
+#define CHANGELOG_HEADER                                                \
+        "GlusterFS Changelog | version: v%d.%d | encoding : %d\n"
+
+#define CHANGELOG_MAKE_SOCKET_PATH(brick_path, sockpath, len) do {      \
+                char md5_sum[MD5_DIGEST_LENGTH*2+1] = {0,};             \
+                md5_wrapper((unsigned char *) brick_path,               \
+                            strlen(brick_path),                         \
+                            md5_sum);                                   \
+                (void) snprintf (sockpath, len,                         \
+                                 CHANGELOG_UNIX_SOCK, md5_sum);         \
+        } while (0)
+
+/**
+ * ... used by libgfchangelog.
+ */
+#define CHANGELOG_GET_ENCODING(fd, buffer, len, enc, enc_len) do {      \
+                FILE *fp;                                               \
+                int fd_dup, maj, min;                                   \
+                                                                        \
+                enc = -1;                                               \
+                fd_dup = dup (fd);                                      \
+                                                                        \
+                if (fd_dup != -1) {                                     \
+                        fp = fdopen (fd_dup, "r");                      \
+                        if (fp) {                                       \
+                                if (fgets (buffer, len, fp)) {          \
+                                        elen = strlen (buffer);         \
+                                        sscanf (buffer,                 \
+                                                CHANGELOG_HEADER,       \
+                                                &maj, &min, &enc);      \
+                                }                                       \
+                                fclose (fp);                            \
+                        } else {                                        \
+                                close (fd_dup);                         \
+                        }                                               \
+                }                                                       \
+        } while (0)
+
+/**
+ * everything after 'CHANGELOG_TYPE_ENTRY' are internal types
+ * (ie. none of the fops trigger this type of event), hence
+ * CHANGELOG_MAX_TYPE = 3
+ */
+typedef enum {
+        CHANGELOG_TYPE_DATA = 0,
+        CHANGELOG_TYPE_METADATA,
+        CHANGELOG_TYPE_ENTRY,
+        CHANGELOG_TYPE_ROLLOVER,
+        CHANGELOG_TYPE_FSYNC,
+} changelog_log_type;
+
+/* operation modes - RT for now */
+typedef enum {
+        CHANGELOG_MODE_RT = 0,
+} changelog_mode_t;
+
+/* encoder types */
+
+typedef enum {
+        CHANGELOG_ENCODE_MIN = 0,
+        CHANGELOG_ENCODE_BINARY,
+        CHANGELOG_ENCODE_ASCII,
+        CHANGELOG_ENCODE_MAX,
+} changelog_encoder_t;
+
+#define CHANGELOG_VALID_ENCODING(enc)                                   \
+        (enc > CHANGELOG_ENCODE_MIN && enc < CHANGELOG_ENCODE_MAX)
+
+#define CHANGELOG_TYPE_IS_ENTRY(type)  (type == CHANGELOG_TYPE_ENTRY)
+#define CHANGELOG_TYPE_IS_ROLLOVER(type)  (type == CHANGELOG_TYPE_ROLLOVER)
+#define CHANGELOG_TYPE_IS_FSYNC(type)  (type == CHANGELOG_TYPE_FSYNC)
+
+#endif /* _CHANGELOG_MISC_H */
diff --git a/xlators/features/changelog/src/changelog-notifier.c b/xlators/features/changelog/src/changelog-notifier.c
new file mode 100644
index 000000000..1f8b31253
--- /dev/null
+++ b/xlators/features/changelog/src/changelog-notifier.c
@@ -0,0 +1,314 @@
+/*
+   Copyright (c) 2013 Red Hat, Inc. <http://www.redhat.com>
+   This file is part of GlusterFS.
+
+   This file is licensed to you under your choice of the GNU Lesser
+   General Public License, version 3 or any later version (LGPLv3 or
+   later), or the GNU General Public License, version 2 (GPLv2), in all
+   cases as published by the Free Software Foundation.
+*/
+
+#include "changelog-notifier.h"
+
+#include <pthread.h>
+
+inline static void
+changelog_notify_clear_fd (changelog_notify_t *cn, int i)
+{
+        cn->client_fd[i] = -1;
+}
+
+inline static void
+changelog_notify_save_fd (changelog_notify_t *cn, int i, int fd)
+{
+        cn->client_fd[i] = fd;
+}
+
+static int
+changelog_notify_insert_fd (xlator_t *this, changelog_notify_t *cn, int fd)
+{
+        int i   = 0;
+        int ret = 0;
+
+        for (; i < CHANGELOG_MAX_CLIENTS; i++) {
+                if (cn->client_fd[i] == -1)
+                        break;
+        }
+
+        if (i == CHANGELOG_MAX_CLIENTS) {
+                /**
+                 * this case should not be hit as listen() would limit
+                 * the number of completely established connections.
+                 */
+                gf_log (this->name, GF_LOG_WARNING,
+                        "hit max client limit (%d)", CHANGELOG_MAX_CLIENTS);
+                ret = -1;
+        }
+        else
+                changelog_notify_save_fd (cn, i, fd);
+
+        return ret;
+}
+
+static void
+changelog_notify_fill_rset (changelog_notify_t *cn, fd_set *rset, int *maxfd)
+{
+        int i = 0;
+
+        FD_ZERO (rset);
+
+        FD_SET (cn->socket_fd, rset);
+        *maxfd = cn->socket_fd;
+
+        FD_SET (cn->rfd, rset);
+        *maxfd = max (*maxfd, cn->rfd);
+
+        for (; i < CHANGELOG_MAX_CLIENTS; i++) {
+                if (cn->client_fd[i] != -1) {
+                        FD_SET (cn->client_fd[i], rset);
+                        *maxfd = max (*maxfd, cn->client_fd[i]);
+                }
+        }
+
+        *maxfd = *maxfd + 1;
+}
+
+static int
+changelog_notify_client (changelog_notify_t *cn, char *path, ssize_t len)
+{
+        int i = 0;
+        int ret = 0;
+
+        for (; i < CHANGELOG_MAX_CLIENTS; i++) {
+                if (cn->client_fd[i] == -1)
+                        continue;
+
+                if (changelog_write (cn->client_fd[i],
+                                     path, len)) {
+                        ret = -1;
+
+                        close (cn->client_fd[i]);
+                        changelog_notify_clear_fd (cn, i);
+                }
+        }
+
+        return ret;
+}
+
+static void
+changelog_notifier_init (changelog_notify_t *cn)
+{
+        int i = 0;
+
+        cn->socket_fd = -1;
+
+        for (; i < CHANGELOG_MAX_CLIENTS; i++) {
+                changelog_notify_clear_fd (cn, i);
+        }
+}
+
+static void
+changelog_close_client_conn (changelog_notify_t *cn)
+{
+        int i = 0;
+
+        for (; i < CHANGELOG_MAX_CLIENTS; i++) {
+                if (cn->client_fd[i] == -1)
+                        continue;
+
+                close (cn->client_fd[i]);
+                changelog_notify_clear_fd (cn, i);
+        }
+}
+
+static void
+changelog_notifier_cleanup (void *arg)
+{
+        changelog_notify_t *cn = NULL;
+
+        cn = (changelog_notify_t *) arg;
+
+        changelog_close_client_conn (cn);
+
+        if (cn->socket_fd != -1)
+                close (cn->socket_fd);
+
+        if (cn->rfd)
+                close (cn->rfd);
+
+        if (unlink (cn->sockpath))
+                gf_log ("", GF_LOG_WARNING,
+                        "could not unlink changelog socket file"
+                        " %s (reason: %s", cn->sockpath, strerror (errno));
+}
+
+void *
+changelog_notifier (void *data)
+{
+        int                 i         = 0;
+        int                 fd        = 0;
+        int                 max_fd    = 0;
+        int                 len       = 0;
+        ssize_t             readlen   = 0;
+        xlator_t           *this      = NULL;
+        changelog_priv_t   *priv      = NULL;
+        changelog_notify_t *cn        = NULL;
+        struct sockaddr_un  local     = {0,};
+        char path[PATH_MAX]           = {0,};
+        char abspath[PATH_MAX]        = {0,};
+
+        char buffer;
+        fd_set rset;
+
+        priv = (changelog_priv_t *) data;
+
+        cn = &priv->cn;
+        this = cn->this;
+
+        pthread_cleanup_push (changelog_notifier_cleanup, cn);
+
+        changelog_notifier_init (cn);
+
+        cn->socket_fd = socket (AF_UNIX, SOCK_STREAM, 0);
+        if (cn->socket_fd < 0) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "changelog socket error (reason: %s)",
+                        strerror (errno));
+                goto out;
+        }
+
+        CHANGELOG_MAKE_SOCKET_PATH (priv->changelog_brick,
+                                    cn->sockpath, PATH_MAX);
+        if (unlink (cn->sockpath) < 0) {
+                if (errno != ENOENT) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Could not unlink changelog socket file (%s)"
+                                " (reason: %s)",
+                                CHANGELOG_UNIX_SOCK, strerror (errno));
+                        goto cleanup;
+                }
+        }
+
+        local.sun_family = AF_UNIX;
+        strcpy (local.sun_path, cn->sockpath);
+
+        len = strlen (local.sun_path) + sizeof (local.sun_family);
+
+        /* bind to the unix domain socket */
+        if (bind (cn->socket_fd, (struct sockaddr *) &local, len) < 0) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Could not bind to changelog socket (reason: %s)",
+                        strerror (errno));
+                goto cleanup;
+        }
+
+        /* listen for incoming connections */
+        if (listen (cn->socket_fd, CHANGELOG_MAX_CLIENTS) < 0) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "listen() error on changelog socket (reason: %s)",
+                        strerror (errno));
+                goto cleanup;
+        }
+
+        /**
+         * simple select() on all to-be-read file descriptors. This method
+         * though old school works pretty well when you have a handfull of
+         * fd's to be watched (clients).
+         *
+         * Future TODO: move this to epoll based notification facility if
+         *              number of clients increase.
+         */
+        for (;;) {
+                changelog_notify_fill_rset (cn, &rset, &max_fd);
+
+                if (select (max_fd, &rset, NULL, NULL, NULL) < 0) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "select() returned -1 (reason: %s)",
+                                strerror (errno));
+                        sleep (2);
+                        continue;
+                }
+
+                if (FD_ISSET (cn->socket_fd, &rset)) {
+                        fd = accept (cn->socket_fd, NULL, NULL);
+                        if (fd < 0) {
+                                gf_log (this->name, GF_LOG_ERROR,
+                                        "accept error on changelog socket"
+                                        " (reason: %s)", strerror (errno));
+                        } else if (changelog_notify_insert_fd (this, cn, fd)) {
+                                gf_log (this->name, GF_LOG_ERROR,
+                                        "hit max client limit");
+                        }
+                }
+
+                if (FD_ISSET (cn->rfd, &rset)) {
+                        /**
+                         * read changelog filename and notify all connected
+                         * clients.
+                         */
+                        readlen = 0;
+                        while (readlen < PATH_MAX) {
+                                len = read (cn->rfd, &path[readlen++], 1);
+                                if (len == -1) {
+                                        break;
+                                }
+
+                                if (len == 0) {
+                                        gf_log (this->name, GF_LOG_ERROR,
+                                                "rollover thread sent EOF"
+                                                " on pipe - possibly a crash.");
+                                        /* be blunt and close all connections */
+                                        pthread_exit(NULL);
+                                }
+
+                                if (path[readlen - 1] == '\0')
+                                        break;
+                        }
+
+                        /* should we close all client connections here too? */
+                        if (len < 0 || readlen == PATH_MAX) {
+                                gf_log (this->name, GF_LOG_ERROR,
+                                        "Could not get pathname from rollover"
+                                        " thread or pathname too long");
+                                goto process_rest;
+                        }
+
+                        (void) snprintf (abspath, PATH_MAX,
+                                         "%s/%s", priv->changelog_dir, path);
+                        if (changelog_notify_client (cn, abspath,
+                                                     strlen (abspath) + 1))
+                                gf_log (this->name, GF_LOG_ERROR,
+                                        "could not notify some clients with new"
+                                        " changelogs");
+                }
+
+        process_rest:
+                for (i = 0; i < CHANGELOG_MAX_CLIENTS; i++) {
+                        if ( (fd = cn->client_fd[i]) == -1 )
+                                continue;
+
+                        if (FD_ISSET (fd, &rset)) {
+                                /**
+                                 * the only data we accept from the client is a
+                                 * disconnect. Anything else is treated as bogus
+                                 * and is silently discarded (also warned!!!).
+                                 */
+                                if ( (readlen = read (fd, &buffer, 1)) <= 0 ) {
+                                        close (fd);
+                                        changelog_notify_clear_fd (cn, i);
+                                } else {
+                                        /* silently discard data and log */
+                                        gf_log (this->name, GF_LOG_WARNING,
+                                                "misbehaving changelog client");
+                                }
+                        }
+                }
+
+        }
+
+ cleanup:;
+        pthread_cleanup_pop (1);
+
+ out:
+        return NULL;
+}
diff --git a/xlators/features/marker/utils/src/procdiggy.h b/xlators/features/changelog/src/changelog-notifier.h
index 56dfc4eb2..55e728356 100644
--- a/xlators/features/marker/utils/src/procdiggy.h
+++ b/xlators/features/changelog/src/changelog-notifier.h
@@ -1,5 +1,5 @@
 /*
-   Copyright (c) 2011-2012 Red Hat, Inc. <http://www.redhat.com>
+   Copyright (c) 2013 Red Hat, Inc. <http://www.redhat.com>
    This file is part of GlusterFS.
 
    This file is licensed to you under your choice of the GNU Lesser
@@ -7,14 +7,13 @@
    later), or the GNU General Public License, version 2 (GPLv2), in all
    cases as published by the Free Software Foundation.
 */
-#ifdef __NetBSD__
-#include <sys/syslimits.h>
-#endif /* __NetBSD__ */
 
-#define PROC "/proc"
+#ifndef _CHANGELOG_NOTIFIER_H
+#define _CHANGELOG_NOTIFIER_H
 
-pid_t pidinfo (pid_t pid, char **name);
+#include "changelog-helpers.h"
 
-int prociter (int (*proch) (pid_t pid, pid_t ppid, char *name, void *data),
-              void *data);
+void *
+changelog_notifier (void *data);
 
+#endif
diff --git a/xlators/features/changelog/src/changelog-rt.c b/xlators/features/changelog/src/changelog-rt.c
new file mode 100644
index 000000000..c147f68ca
--- /dev/null
+++ b/xlators/features/changelog/src/changelog-rt.c
@@ -0,0 +1,72 @@
+/*
+   Copyright (c) 2013 Red Hat, Inc. <http://www.redhat.com>
+   This file is part of GlusterFS.
+
+   This file is licensed to you under your choice of the GNU Lesser
+   General Public License, version 3 or any later version (LGPLv3 or
+   later), or the GNU General Public License, version 2 (GPLv2), in all
+   cases as published by the Free Software Foundation.
+*/
+
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+
+#include "xlator.h"
+#include "defaults.h"
+#include "logging.h"
+
+#include "changelog-rt.h"
+#include "changelog-mem-types.h"
+
+int
+changelog_rt_init (xlator_t *this, changelog_dispatcher_t *cd)
+{
+        changelog_rt_t *crt = NULL;
+
+        crt = GF_CALLOC (1, sizeof (*crt),
+                         gf_changelog_mt_rt_t);
+        if (!crt)
+                return -1;
+
+        LOCK_INIT (&crt->lock);
+
+        cd->cd_data = crt;
+        cd->dispatchfn = &changelog_rt_enqueue;
+
+        return 0;
+}
+
+int
+changelog_rt_fini (xlator_t *this, changelog_dispatcher_t *cd)
+{
+        changelog_rt_t *crt = NULL;
+
+        crt = cd->cd_data;
+
+        LOCK_DESTROY (&crt->lock);
+        GF_FREE (crt);
+
+        return 0;
+}
+
+int
+changelog_rt_enqueue (xlator_t *this, changelog_priv_t *priv, void *cbatch,
+                      changelog_log_data_t *cld_0, changelog_log_data_t *cld_1)
+{
+        int             ret = 0;
+        changelog_rt_t *crt = NULL;
+
+        crt = (changelog_rt_t *) cbatch;
+
+        LOCK (&crt->lock);
+        {
+                ret = changelog_handle_change (this, priv, cld_0);
+                if (!ret && cld_1)
+                        ret = changelog_handle_change (this, priv, cld_1);
+        }
+        UNLOCK (&crt->lock);
+
+        return ret;
+}
diff --git a/xlators/features/changelog/src/changelog-rt.h b/xlators/features/changelog/src/changelog-rt.h
new file mode 100644
index 000000000..1fc2bbc5b
--- /dev/null
+++ b/xlators/features/changelog/src/changelog-rt.h
@@ -0,0 +1,33 @@
+/*
+   Copyright (c) 2013 Red Hat, Inc. <http://www.redhat.com>
+   This file is part of GlusterFS.
+
+   This file is licensed to you under your choice of the GNU Lesser
+   General Public License, version 3 or any later version (LGPLv3 or
+   later), or the GNU General Public License, version 2 (GPLv2), in all
+   cases as published by the Free Software Foundation.
+*/
+
+#ifndef _CHANGELOG_RT_H
+#define _CHANGELOG_RT_H
+
+#include "locking.h"
+#include "timer.h"
+#include "pthread.h"
+
+#include "changelog-helpers.h"
+
+/* unused as of now - may be you would need it later */
+typedef struct changelog_rt {
+        gf_lock_t lock;
+} changelog_rt_t;
+
+int
+changelog_rt_init (xlator_t *this, changelog_dispatcher_t *cd);
+int
+changelog_rt_fini (xlator_t *this, changelog_dispatcher_t *cd);
+int
+changelog_rt_enqueue (xlator_t *this, changelog_priv_t *priv, void *cbatch,
+                      changelog_log_data_t *cld_0, changelog_log_data_t *cld_1);
+
+#endif /* _CHANGELOG_RT_H */
diff --git a/xlators/features/changelog/src/changelog.c b/xlators/features/changelog/src/changelog.c
new file mode 100644
index 000000000..cea0e8c70
--- /dev/null
+++ b/xlators/features/changelog/src/changelog.c
@@ -0,0 +1,1477 @@
+/*
+   Copyright (c) 2013 Red Hat, Inc. <http://www.redhat.com>
+   This file is part of GlusterFS.
+
+   This file is licensed to you under your choice of the GNU Lesser
+   General Public License, version 3 or any later version (LGPLv3 or
+   later), or the GNU General Public License, version 2 (GPLv2), in all
+   cases as published by the Free Software Foundation.
+*/
+
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+
+#include "xlator.h"
+#include "defaults.h"
+#include "logging.h"
+#include "iobuf.h"
+
+#include "changelog-rt.h"
+
+#include "changelog-encoders.h"
+#include "changelog-mem-types.h"
+
+#include <pthread.h>
+
+#include "changelog-notifier.h"
+
+static struct changelog_bootstrap
+cb_bootstrap[] = {
+        {
+                .mode = CHANGELOG_MODE_RT,
+                .ctor = changelog_rt_init,
+                .dtor = changelog_rt_fini,
+        },
+};
+
+/* Entry operations - TYPE III */
+
+/**
+ * entry operations do not undergo inode version checking.
+ */
+
+/* {{{ */
+
+/* rmdir */
+
+int32_t
+changelog_rmdir_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                     int32_t op_ret, int32_t op_errno, struct iatt *preparent,
+                     struct iatt *postparent, dict_t *xdata)
+{
+        changelog_priv_t  *priv  = NULL;
+        changelog_local_t *local = NULL;
+
+        priv  = this->private;
+        local = frame->local;
+
+        CHANGELOG_COND_GOTO (priv, ((op_ret < 0) || !local), unwind);
+
+        changelog_update (this, priv, local, CHANGELOG_TYPE_ENTRY);
+
+ unwind:
+        CHANGELOG_STACK_UNWIND (rmdir, frame, op_ret, op_errno,
+                                preparent, postparent, xdata);
+        return 0;
+}
+
+int32_t
+changelog_rmdir (call_frame_t *frame, xlator_t *this,
+                 loc_t *loc, int xflags, dict_t *xdata)
+{
+        size_t            xtra_len = 0;
+        changelog_priv_t *priv     = NULL;
+        changelog_opt_t  *co       = NULL;
+
+        priv = this->private;
+        CHANGELOG_NOT_ACTIVE_THEN_GOTO (frame, priv, wind);
+
+        CHANGELOG_INIT_NOCHECK (this, frame->local,
+                                NULL, loc->inode->gfid, 2);
+
+        co = changelog_get_usable_buffer (frame->local);
+        if (!co)
+                goto wind;
+
+        CHANGLOG_FILL_FOP_NUMBER (co, frame->root->op, fop_fn, xtra_len);
+
+        co++;
+        CHANGELOG_FILL_ENTRY (co, loc->pargfid, loc->name,
+                              entry_fn, entry_free_fn, xtra_len, wind);
+
+        changelog_set_usable_record_and_length (frame->local, xtra_len, 2);
+
+ wind:
+        STACK_WIND (frame, changelog_rmdir_cbk,
+                    FIRST_CHILD (this), FIRST_CHILD (this)->fops->rmdir,
+                    loc, xflags, xdata);
+        return 0;
+}
+
+/* unlink */
+
+int32_t
+changelog_unlink_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                      int32_t op_ret, int32_t op_errno, struct iatt *preparent,
+                      struct iatt *postparent, dict_t *xdata)
+{
+        changelog_priv_t  *priv  = NULL;
+        changelog_local_t *local = NULL;
+
+        priv  = this->private;
+        local = frame->local;
+
+        CHANGELOG_COND_GOTO (priv, ((op_ret < 0) || !local), unwind);
+
+        changelog_update (this, priv, local, CHANGELOG_TYPE_ENTRY);
+
+ unwind:
+        CHANGELOG_STACK_UNWIND (unlink, frame, op_ret, op_errno,
+                                preparent, postparent, xdata);
+        return 0;
+}
+
+int32_t
+changelog_unlink (call_frame_t *frame, xlator_t *this,
+                  loc_t *loc, int xflags, dict_t *xdata)
+{
+        size_t            xtra_len = 0;
+        changelog_priv_t *priv     = NULL;
+        changelog_opt_t  *co       = NULL;
+
+        priv = this->private;
+        CHANGELOG_NOT_ACTIVE_THEN_GOTO (frame, priv, wind);
+        CHANGELOG_IF_INTERNAL_FOP_THEN_GOTO (xdata, wind);
+
+        CHANGELOG_INIT_NOCHECK (this, frame->local, NULL, loc->inode->gfid, 2);
+
+        co = changelog_get_usable_buffer (frame->local);
+        if (!co)
+                goto wind;
+
+        CHANGLOG_FILL_FOP_NUMBER (co, frame->root->op, fop_fn, xtra_len);
+
+        co++;
+        CHANGELOG_FILL_ENTRY (co, loc->pargfid, loc->name,
+                              entry_fn, entry_free_fn, xtra_len, wind);
+
+        changelog_set_usable_record_and_length (frame->local, xtra_len, 2);
+
+ wind:
+        STACK_WIND (frame, changelog_unlink_cbk,
+                    FIRST_CHILD (this), FIRST_CHILD (this)->fops->unlink,
+                    loc, xflags, xdata);
+        return 0;
+}
+
+/* rename */
+
+int32_t
+changelog_rename_cbk (call_frame_t *frame,
+                      void *cookie, xlator_t *this,
+                      int32_t op_ret, int32_t op_errno,
+                      struct iatt *buf, struct iatt *preoldparent,
+                      struct iatt *postoldparent, struct iatt *prenewparent,
+                      struct iatt *postnewparent, dict_t *xdata)
+{
+        changelog_priv_t  *priv  = NULL;
+        changelog_local_t *local = NULL;
+
+        priv  = this->private;
+        local = frame->local;
+
+        CHANGELOG_COND_GOTO (priv, ((op_ret < 0) || !local), unwind);
+
+        changelog_update (this, priv, local, CHANGELOG_TYPE_ENTRY);
+
+ unwind:
+        CHANGELOG_STACK_UNWIND (rename, frame, op_ret, op_errno,
+                                buf, preoldparent, postoldparent,
+                                prenewparent, postnewparent, xdata);
+        return 0;
+}
+
+
+int32_t
+changelog_rename (call_frame_t *frame, xlator_t *this,
+                  loc_t *oldloc, loc_t *newloc, dict_t *xdata)
+{
+        size_t            xtra_len  = 0;
+        changelog_priv_t *priv      = NULL;
+        changelog_opt_t  *co        = NULL;
+
+        priv = this->private;
+        CHANGELOG_NOT_ACTIVE_THEN_GOTO (frame, priv, wind);
+
+        /* 3 == fop + oldloc + newloc */
+        CHANGELOG_INIT_NOCHECK (this, frame->local,
+                                NULL, oldloc->inode->gfid, 3);
+
+        co = changelog_get_usable_buffer (frame->local);
+        if (!co)
+                goto wind;
+
+        CHANGLOG_FILL_FOP_NUMBER (co, frame->root->op, fop_fn, xtra_len);
+
+        co++;
+        CHANGELOG_FILL_ENTRY (co, oldloc->pargfid, oldloc->name,
+                              entry_fn, entry_free_fn, xtra_len, wind);
+
+        co++;
+        CHANGELOG_FILL_ENTRY (co, newloc->pargfid, newloc->name,
+                              entry_fn, entry_free_fn, xtra_len, wind);
+
+        changelog_set_usable_record_and_length (frame->local, xtra_len, 3);
+
+ wind:
+        STACK_WIND (frame, changelog_rename_cbk,
+                    FIRST_CHILD (this), FIRST_CHILD (this)->fops->rename,
+                    oldloc, newloc, xdata);
+        return 0;
+}
+
+/* link */
+
+int32_t
+changelog_link_cbk (call_frame_t *frame,
+                    void *cookie, xlator_t *this, int32_t op_ret,
+                    int32_t op_errno, inode_t *inode,
+                    struct iatt *buf, struct iatt *preparent,
+                    struct iatt *postparent, dict_t *xdata)
+{
+        changelog_priv_t  *priv  = NULL;
+        changelog_local_t *local = NULL;
+
+        priv  = this->private;
+        local = frame->local;
+
+        CHANGELOG_COND_GOTO (priv, ((op_ret < 0) || !local), unwind);
+
+        changelog_update (this, priv, local, CHANGELOG_TYPE_ENTRY);
+
+ unwind:
+        CHANGELOG_STACK_UNWIND (link, frame, op_ret, op_errno,
+                                inode, buf, preparent, postparent, xdata);
+        return 0;
+}
+
+int32_t
+changelog_link (call_frame_t *frame,
+                xlator_t *this, loc_t *oldloc,
+                loc_t *newloc, dict_t *xdata)
+{
+        size_t            xtra_len = 0;
+        changelog_priv_t *priv     = NULL;
+        changelog_opt_t  *co       = NULL;
+
+        priv = this->private;
+
+        CHANGELOG_NOT_ACTIVE_THEN_GOTO (frame, priv, wind);
+        CHANGELOG_IF_INTERNAL_FOP_THEN_GOTO (xdata, wind);
+
+        CHANGELOG_INIT_NOCHECK (this, frame->local, NULL, oldloc->gfid, 2);
+
+        co = changelog_get_usable_buffer (frame->local);
+        if (!co)
+                goto wind;
+
+        CHANGLOG_FILL_FOP_NUMBER (co, frame->root->op, fop_fn, xtra_len);
+
+        co++;
+        CHANGELOG_FILL_ENTRY (co, newloc->pargfid, newloc->name,
+                              entry_fn, entry_free_fn, xtra_len, wind);
+
+        changelog_set_usable_record_and_length (frame->local, xtra_len, 2);
+
+ wind:
+        STACK_WIND (frame, changelog_link_cbk,
+                    FIRST_CHILD (this), FIRST_CHILD (this)->fops->link,
+                    oldloc, newloc, xdata);
+        return 0;
+}
+
+/* mkdir */
+
+int32_t
+changelog_mkdir_cbk (call_frame_t *frame,
+                     void *cookie, xlator_t *this, int32_t op_ret,
+                     int32_t op_errno, inode_t *inode,
+                     struct iatt *buf, struct iatt *preparent,
+                     struct iatt *postparent, dict_t *xdata)
+{
+        changelog_priv_t  *priv  = NULL;
+        changelog_local_t *local = NULL;
+
+        priv  = this->private;
+        local = frame->local;
+
+        CHANGELOG_COND_GOTO (priv, ((op_ret < 0) || !local), unwind);
+
+        changelog_update (this, priv, local, CHANGELOG_TYPE_ENTRY);
+
+ unwind:
+        CHANGELOG_STACK_UNWIND (mkdir, frame, op_ret, op_errno,
+                                inode, buf, preparent, postparent, xdata);
+        return 0;
+}
+
+int32_t
+changelog_mkdir (call_frame_t *frame, xlator_t *this,
+                 loc_t *loc, mode_t mode, mode_t umask, dict_t *xdata)
+{
+        int               ret      = -1;
+        uuid_t            gfid     = {0,};
+        void             *uuid_req = NULL;
+        size_t            xtra_len = 0;
+        changelog_priv_t *priv     = NULL;
+        changelog_opt_t  *co       = NULL;
+
+        priv = this->private;
+        CHANGELOG_NOT_ACTIVE_THEN_GOTO (frame, priv, wind);
+
+        ret = dict_get_ptr (xdata, "gfid-req", &uuid_req);
+        if (ret) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "failed to get gfid from dict");
+                goto wind;
+        }
+        uuid_copy (gfid, uuid_req);
+
+        CHANGELOG_INIT_NOCHECK (this, frame->local, NULL, gfid, 2);
+
+        co = changelog_get_usable_buffer (frame->local);
+        if (!co)
+                goto wind;
+
+        CHANGLOG_FILL_FOP_NUMBER (co, frame->root->op, fop_fn, xtra_len);
+
+        co++;
+        CHANGELOG_FILL_ENTRY (co, loc->pargfid, loc->name,
+                              entry_fn, entry_free_fn, xtra_len, wind);
+
+        changelog_set_usable_record_and_length (frame->local, xtra_len, 2);
+
+ wind:
+        STACK_WIND (frame, changelog_mkdir_cbk,
+                    FIRST_CHILD (this), FIRST_CHILD (this)->fops->mkdir,
+                    loc, mode, umask, xdata);
+        return 0;
+}
+
+/* symlink */
+
+int32_t
+changelog_symlink_cbk (call_frame_t *frame,
+                       void *cookie, xlator_t *this,
+                       int32_t op_ret, int32_t op_errno,
+                       inode_t *inode, struct iatt *buf, struct iatt *preparent,
+                       struct iatt *postparent, dict_t *xdata)
+{
+        changelog_priv_t  *priv  = NULL;
+        changelog_local_t *local = NULL;
+
+        priv  = this->private;
+        local = frame->local;
+
+        CHANGELOG_COND_GOTO (priv, ((op_ret < 0) || !local), unwind);
+
+        changelog_update (this, priv, local, CHANGELOG_TYPE_ENTRY);
+
+ unwind:
+        CHANGELOG_STACK_UNWIND (symlink, frame, op_ret, op_errno,
+                                inode, buf, preparent, postparent, xdata);
+        return 0;
+}
+
+int32_t
+changelog_symlink (call_frame_t *frame, xlator_t *this,
+                   const char *linkname, loc_t *loc,
+                   mode_t umask, dict_t *xdata)
+{
+        int               ret      = -1;
+        size_t            xtra_len = 0;
+        uuid_t            gfid     = {0,};
+        void             *uuid_req = NULL;
+        changelog_priv_t *priv     = NULL;
+        changelog_opt_t  *co       = NULL;
+
+        priv = this->private;
+        CHANGELOG_NOT_ACTIVE_THEN_GOTO (frame, priv, wind);
+
+        ret = dict_get_ptr (xdata, "gfid-req", &uuid_req);
+        if (ret) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "failed to get gfid from dict");
+                goto wind;
+        }
+        uuid_copy (gfid, uuid_req);
+
+        CHANGELOG_INIT_NOCHECK (this, frame->local, NULL, gfid, 2);
+
+        co = changelog_get_usable_buffer (frame->local);
+        if (!co)
+                goto wind;
+
+        CHANGLOG_FILL_FOP_NUMBER (co, frame->root->op, fop_fn, xtra_len);
+
+        co++;
+        CHANGELOG_FILL_ENTRY (co, loc->pargfid, loc->name,
+                              entry_fn, entry_free_fn, xtra_len, wind);
+
+        changelog_set_usable_record_and_length (frame->local, xtra_len, 2);
+
+ wind:
+        STACK_WIND (frame, changelog_symlink_cbk,
+                    FIRST_CHILD (this), FIRST_CHILD (this)->fops->symlink,
+                    linkname, loc, umask, xdata);
+        return 0;
+}
+
+/* mknod */
+
+int32_t
+changelog_mknod_cbk (call_frame_t *frame,
+                     void *cookie, xlator_t *this,
+                     int32_t op_ret, int32_t op_errno, inode_t *inode,
+                     struct iatt *buf, struct iatt *preparent,
+                     struct iatt *postparent, dict_t *xdata)
+{
+        changelog_priv_t  *priv  = NULL;
+        changelog_local_t *local = NULL;
+
+        priv  = this->private;
+        local = frame->local;
+
+        CHANGELOG_COND_GOTO (priv, ((op_ret < 0) || !local), unwind);
+
+        changelog_update (this, priv, local, CHANGELOG_TYPE_ENTRY);
+
+ unwind:
+        CHANGELOG_STACK_UNWIND (mknod, frame, op_ret, op_errno,
+                                inode, buf, preparent, postparent, xdata);
+        return 0;
+}
+
+int32_t
+changelog_mknod (call_frame_t *frame,
+                 xlator_t *this, loc_t *loc,
+                 mode_t mode, dev_t dev, mode_t umask, dict_t *xdata)
+{
+        int               ret      = -1;
+        uuid_t            gfid     = {0,};
+        void             *uuid_req = NULL;
+        size_t            xtra_len = 0;
+        changelog_priv_t *priv     = NULL;
+        changelog_opt_t  *co       = NULL;
+
+        priv = this->private;
+        CHANGELOG_NOT_ACTIVE_THEN_GOTO (frame, priv, wind);
+
+        ret = dict_get_ptr (xdata, "gfid-req", &uuid_req);
+        if (ret) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "failed to get gfid from dict");
+                goto wind;
+        }
+        uuid_copy (gfid, uuid_req);
+
+        CHANGELOG_INIT_NOCHECK (this, frame->local, NULL, gfid, 2);
+
+        co = changelog_get_usable_buffer (frame->local);
+        if (!co)
+                goto wind;
+
+        CHANGLOG_FILL_FOP_NUMBER (co, frame->root->op, fop_fn, xtra_len);
+
+        co++;
+        CHANGELOG_FILL_ENTRY (co, loc->pargfid, loc->name,
+                              entry_fn, entry_free_fn, xtra_len, wind);
+
+        changelog_set_usable_record_and_length (frame->local, xtra_len, 2);
+
+ wind:
+        STACK_WIND (frame, changelog_mknod_cbk,
+                    FIRST_CHILD (this), FIRST_CHILD (this)->fops->mknod,
+                    loc, mode, dev, umask, xdata);
+        return 0;
+}
+
+/* creat */
+
+int32_t
+changelog_create_cbk (call_frame_t *frame,
+                      void *cookie, xlator_t *this,
+                      int32_t op_ret, int32_t op_errno,
+                      fd_t *fd, inode_t *inode, struct iatt *buf,
+                      struct iatt *preparent,
+                      struct iatt *postparent, dict_t *xdata)
+{
+        changelog_priv_t  *priv  = NULL;
+        changelog_local_t *local = NULL;
+
+        priv  = this->private;
+        local = frame->local;
+
+        CHANGELOG_COND_GOTO (priv, ((op_ret < 0) || !local), unwind);
+
+        changelog_update (this, priv, local, CHANGELOG_TYPE_ENTRY);
+
+ unwind:
+        CHANGELOG_STACK_UNWIND (create, frame,
+                                op_ret, op_errno, fd, inode,
+                                buf, preparent, postparent, xdata);
+        return 0;
+}
+
+int32_t
+changelog_create (call_frame_t *frame, xlator_t *this,
+                  loc_t *loc, int32_t flags, mode_t mode,
+                  mode_t umask, fd_t *fd, dict_t *xdata)
+{
+        int               ret      = -1;
+        uuid_t            gfid     = {0,};
+        void             *uuid_req = NULL;
+        changelog_opt_t  *co       = NULL;
+        changelog_priv_t *priv     = NULL;
+        size_t            xtra_len = 0;
+
+        priv = this->private;
+        CHANGELOG_NOT_ACTIVE_THEN_GOTO (frame, priv, wind);
+
+        ret = dict_get_ptr (xdata, "gfid-req", &uuid_req);
+        if (ret) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "failed to get gfid from dict");
+                goto wind;
+        }
+        uuid_copy (gfid, uuid_req);
+
+        /* init with two extra records */
+        CHANGELOG_INIT_NOCHECK (this, frame->local, NULL, gfid, 2);
+        if (!frame->local)
+                goto wind;
+
+        co = changelog_get_usable_buffer (frame->local);
+        if (!co)
+                goto wind;
+
+        CHANGLOG_FILL_FOP_NUMBER (co, frame->root->op, fop_fn, xtra_len);
+
+        co++;
+        CHANGELOG_FILL_ENTRY (co, loc->pargfid, loc->name,
+                              entry_fn, entry_free_fn, xtra_len, wind);
+
+        changelog_set_usable_record_and_length (frame->local, xtra_len, 2);
+
+ wind:
+        STACK_WIND (frame, changelog_create_cbk,
+                    FIRST_CHILD (this), FIRST_CHILD (this)->fops->create,
+                    loc, flags, mode, umask, fd, xdata);
+        return 0;
+}
+
+/* }}} */
+
+
+/* Metadata modification fops - TYPE II */
+
+/* {{{ */
+
+/* {f}setattr */
+
+int32_t
+changelog_fsetattr_cbk (call_frame_t *frame,
+                        void *cookie, xlator_t *this, int32_t op_ret,
+                        int32_t op_errno, struct iatt *preop_stbuf,
+                        struct iatt *postop_stbuf, dict_t *xdata)
+{
+        changelog_priv_t  *priv  = NULL;
+        changelog_local_t *local = NULL;
+
+        priv  = this->private;
+        local = frame->local;
+
+        CHANGELOG_COND_GOTO (priv, ((op_ret < 0) || !local), unwind);
+
+        changelog_update (this, priv, local, CHANGELOG_TYPE_METADATA);
+
+ unwind:
+        CHANGELOG_STACK_UNWIND (fsetattr, frame, op_ret, op_errno,
+                                preop_stbuf, postop_stbuf, xdata);
+
+        return 0;
+
+
+}
+
+int32_t
+changelog_fsetattr (call_frame_t *frame,
+                    xlator_t *this, fd_t *fd,
+                    struct iatt *stbuf, int32_t valid, dict_t *xdata)
+{
+        changelog_priv_t *priv = NULL;
+
+        priv = this->private;
+        CHANGELOG_NOT_ACTIVE_THEN_GOTO (frame, priv, wind);
+
+        CHANGELOG_INIT (this, frame->local,
+                        fd->inode, fd->inode->gfid, 0);
+
+ wind:
+        STACK_WIND (frame, changelog_fsetattr_cbk,
+                    FIRST_CHILD (this), FIRST_CHILD (this)->fops->fsetattr,
+                    fd, stbuf, valid, xdata);
+        return 0;
+
+
+}
+
+int32_t
+changelog_setattr_cbk (call_frame_t *frame,
+                       void *cookie, xlator_t *this, int32_t op_ret,
+                       int32_t op_errno, struct iatt *preop_stbuf,
+                       struct iatt *postop_stbuf, dict_t *xdata)
+{
+        changelog_priv_t  *priv  = NULL;
+        changelog_local_t *local = NULL;
+
+        priv  = this->private;
+        local = frame->local;
+
+        CHANGELOG_COND_GOTO (priv, ((op_ret < 0) || !local), unwind);
+
+        changelog_update (this, priv, local, CHANGELOG_TYPE_METADATA);
+
+ unwind:
+        CHANGELOG_STACK_UNWIND (setattr, frame, op_ret, op_errno,
+                                preop_stbuf, postop_stbuf, xdata);
+
+        return 0;
+}
+
+int32_t
+changelog_setattr (call_frame_t *frame,
+                   xlator_t *this, loc_t *loc,
+                   struct iatt *stbuf, int32_t valid, dict_t *xdata)
+{
+        changelog_priv_t *priv = NULL;
+
+        priv = this->private;
+        CHANGELOG_NOT_ACTIVE_THEN_GOTO (frame, priv, wind);
+
+        CHANGELOG_INIT (this, frame->local,
+                        loc->inode, loc->inode->gfid, 0);
+
+ wind:
+        STACK_WIND (frame, changelog_setattr_cbk,
+                    FIRST_CHILD (this), FIRST_CHILD (this)->fops->setattr,
+                    loc, stbuf, valid, xdata);
+        return 0;
+}
+
+/* {f}removexattr */
+
+int32_t
+changelog_fremovexattr_cbk (call_frame_t *frame,
+                            void *cookie, xlator_t *this,
+                            int32_t op_ret, int32_t op_errno, dict_t *xdata)
+{
+        changelog_priv_t  *priv  = NULL;
+        changelog_local_t *local = NULL;
+
+        priv  = this->private;
+        local = frame->local;
+
+        CHANGELOG_COND_GOTO (priv, ((op_ret < 0) || !local), unwind);
+
+        changelog_update (this, priv, local, CHANGELOG_TYPE_METADATA);
+
+ unwind:
+        CHANGELOG_STACK_UNWIND (fremovexattr, frame, op_ret, op_errno, xdata);
+
+        return 0;
+}
+
+int32_t
+changelog_fremovexattr (call_frame_t *frame, xlator_t *this,
+                        fd_t *fd, const char *name, dict_t *xdata)
+{
+        changelog_priv_t *priv = NULL;
+
+        priv = this->private;
+        CHANGELOG_NOT_ACTIVE_THEN_GOTO (frame, priv, wind);
+
+        CHANGELOG_INIT (this, frame->local,
+                        fd->inode, fd->inode->gfid, 0);
+
+ wind:
+        STACK_WIND (frame, changelog_fremovexattr_cbk,
+                    FIRST_CHILD (this), FIRST_CHILD (this)->fops->fremovexattr,
+                    fd, name, xdata);
+        return 0;
+}
+
+int32_t
+changelog_removexattr_cbk (call_frame_t *frame,
+                           void *cookie, xlator_t *this,
+                           int32_t op_ret, int32_t op_errno, dict_t *xdata)
+{
+        changelog_priv_t  *priv  = NULL;
+        changelog_local_t *local = NULL;
+
+        priv  = this->private;
+        local = frame->local;
+
+        CHANGELOG_COND_GOTO (priv, ((op_ret < 0) || !local), unwind);
+
+        changelog_update (this, priv, local, CHANGELOG_TYPE_METADATA);
+
+ unwind:
+        CHANGELOG_STACK_UNWIND (removexattr, frame, op_ret, op_errno, xdata);
+
+        return 0;
+}
+
+int32_t
+changelog_removexattr (call_frame_t *frame, xlator_t *this,
+                       loc_t *loc, const char *name, dict_t *xdata)
+{
+        changelog_priv_t *priv = NULL;
+
+        priv = this->private;
+        CHANGELOG_NOT_ACTIVE_THEN_GOTO (frame, priv, wind);
+
+        CHANGELOG_INIT (this, frame->local,
+                        loc->inode, loc->inode->gfid, 0);
+
+ wind:
+        STACK_WIND (frame, changelog_removexattr_cbk,
+                    FIRST_CHILD (this), FIRST_CHILD (this)->fops->removexattr,
+                    loc, name, xdata);
+        return 0;
+}
+
+/* {f}setxattr */
+
+int32_t
+changelog_setxattr_cbk (call_frame_t *frame,
+                        void *cookie, xlator_t *this,
+                        int32_t op_ret, int32_t op_errno, dict_t *xdata)
+{
+        changelog_priv_t  *priv  = NULL;
+        changelog_local_t *local = NULL;
+
+        priv  = this->private;
+        local = frame->local;
+
+        CHANGELOG_COND_GOTO (priv, ((op_ret < 0) || !local), unwind);
+
+        changelog_update (this, priv, local, CHANGELOG_TYPE_METADATA);
+
+ unwind:
+        CHANGELOG_STACK_UNWIND (setxattr, frame, op_ret, op_errno, xdata);
+
+        return 0;
+}
+
+int32_t
+changelog_setxattr (call_frame_t *frame,
+                    xlator_t *this, loc_t *loc,
+                    dict_t *dict, int32_t flags, dict_t *xdata)
+{
+        changelog_priv_t *priv = NULL;
+
+        priv = this->private;
+        CHANGELOG_NOT_ACTIVE_THEN_GOTO (frame, priv, wind);
+
+        CHANGELOG_INIT (this, frame->local,
+                        loc->inode, loc->inode->gfid, 0);
+
+ wind:
+        STACK_WIND (frame, changelog_setxattr_cbk,
+                    FIRST_CHILD (this), FIRST_CHILD (this)->fops->setxattr,
+                    loc, dict, flags, xdata);
+        return 0;
+}
+
+int32_t
+changelog_fsetxattr_cbk (call_frame_t *frame,
+                         void *cookie, xlator_t *this, int32_t op_ret,
+                         int32_t op_errno, dict_t *xdata)
+{
+        changelog_priv_t  *priv  = NULL;
+        changelog_local_t *local = NULL;
+
+        priv  = this->private;
+        local = frame->local;
+
+        CHANGELOG_COND_GOTO (priv, ((op_ret < 0) || !local), unwind);
+
+        changelog_update (this, priv, local, CHANGELOG_TYPE_METADATA);
+
+ unwind:
+        CHANGELOG_STACK_UNWIND (fsetxattr, frame, op_ret, op_errno, xdata);
+
+        return 0;
+}
+
+int32_t
+changelog_fsetxattr (call_frame_t *frame,
+                     xlator_t *this, fd_t *fd, dict_t *dict,
+                     int32_t flags, dict_t *xdata)
+{
+        changelog_priv_t *priv = NULL;
+
+        priv = this->private;
+        CHANGELOG_NOT_ACTIVE_THEN_GOTO (frame, priv, wind);
+
+        CHANGELOG_INIT (this, frame->local,
+                        fd->inode, fd->inode->gfid, 0);
+
+ wind:
+        STACK_WIND (frame, changelog_fsetxattr_cbk,
+                    FIRST_CHILD (this), FIRST_CHILD (this)->fops->fsetxattr,
+                    fd, dict, flags, xdata);
+        return 0;
+}
+
+/* }}} */
+
+
+/* Data modification fops - TYPE I */
+
+/* {{{ */
+
+/* {f}truncate() */
+
+int32_t
+changelog_truncate_cbk (call_frame_t *frame,
+                        void *cookie, xlator_t *this, int32_t op_ret,
+                        int32_t op_errno, struct iatt *prebuf,
+                        struct iatt *postbuf, dict_t *xdata)
+{
+        changelog_priv_t  *priv  = NULL;
+        changelog_local_t *local = NULL;
+
+        priv  = this->private;
+        local = frame->local;
+
+        CHANGELOG_COND_GOTO (priv, ((op_ret < 0) || !local), unwind);
+
+        changelog_update (this, priv, local, CHANGELOG_TYPE_DATA);
+
+ unwind:
+        CHANGELOG_STACK_UNWIND (truncate, frame,
+                                op_ret, op_errno, prebuf, postbuf, xdata);
+        return 0;
+}
+
+int32_t
+changelog_truncate (call_frame_t *frame,
+                    xlator_t *this, loc_t *loc, off_t offset, dict_t *xdata)
+{
+        changelog_priv_t *priv = NULL;
+
+        priv = this->private;
+        CHANGELOG_NOT_ACTIVE_THEN_GOTO (frame, priv, wind);
+
+        CHANGELOG_INIT (this, frame->local,
+                        loc->inode, loc->inode->gfid, 0);
+
+ wind:
+        STACK_WIND (frame, changelog_truncate_cbk,
+                    FIRST_CHILD (this), FIRST_CHILD (this)->fops->truncate,
+                    loc, offset, xdata);
+        return 0;
+}
+
+int32_t
+changelog_ftruncate_cbk (call_frame_t *frame,
+                         void *cookie, xlator_t *this, int32_t op_ret,
+                         int32_t op_errno, struct iatt *prebuf,
+                         struct iatt *postbuf, dict_t *xdata)
+{
+        changelog_priv_t  *priv  = NULL;
+        changelog_local_t *local = NULL;
+
+        priv  = this->private;
+        local = frame->local;
+
+        CHANGELOG_COND_GOTO (priv, ((op_ret < 0) || !local), unwind);
+
+        changelog_update (this, priv, local, CHANGELOG_TYPE_DATA);
+
+ unwind:
+        CHANGELOG_STACK_UNWIND (ftruncate, frame,
+                                op_ret, op_errno, prebuf, postbuf, xdata);
+        return 0;
+}
+
+int32_t
+changelog_ftruncate (call_frame_t *frame,
+                     xlator_t *this, fd_t *fd, off_t offset, dict_t *xdata)
+{
+        changelog_priv_t *priv = NULL;
+
+        priv = this->private;
+        CHANGELOG_NOT_ACTIVE_THEN_GOTO (frame, priv, wind);
+
+        CHANGELOG_INIT (this, frame->local,
+                        fd->inode, fd->inode->gfid, 0);
+
+ wind:
+        STACK_WIND (frame, changelog_ftruncate_cbk,
+                    FIRST_CHILD (this), FIRST_CHILD (this)->fops->ftruncate,
+                    fd, offset, xdata);
+        return 0;
+}
+
+/* writev() */
+
+int32_t
+changelog_writev_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                    int32_t op_ret, int32_t op_errno, struct iatt *prebuf,
+                    struct iatt *postbuf,
+                    dict_t *xdata)
+{
+        changelog_priv_t  *priv  = NULL;
+        changelog_local_t *local = NULL;
+
+        priv  = this->private;
+        local = frame->local;
+
+        CHANGELOG_COND_GOTO (priv, ((op_ret <= 0) || !local), unwind);
+
+        changelog_update (this, priv, local, CHANGELOG_TYPE_DATA);
+
+ unwind:
+        CHANGELOG_STACK_UNWIND (writev, frame,
+                                op_ret, op_errno, prebuf, postbuf, xdata);
+        return 0;
+}
+
+int32_t
+changelog_writev (call_frame_t *frame,
+                  xlator_t *this, fd_t *fd, struct iovec *vector,
+                  int32_t count, off_t offset, uint32_t flags,
+                  struct iobref *iobref, dict_t *xdata)
+{
+        changelog_priv_t *priv = NULL;
+
+        priv = this->private;
+        CHANGELOG_NOT_ACTIVE_THEN_GOTO (frame, priv, wind);
+
+        CHANGELOG_INIT (this, frame->local,
+                        fd->inode, fd->inode->gfid, 0);
+
+ wind:
+        STACK_WIND (frame, changelog_writev_cbk, FIRST_CHILD (this),
+                    FIRST_CHILD (this)->fops->writev, fd, vector,
+                    count, offset, flags, iobref, xdata);
+        return 0;
+}
+
+/* }}} */
+
+/**
+ * The
+ *   - @init ()
+ *   - @fini ()
+ *   - @reconfigure ()
+ *   ... and helper routines
+ */
+
+/**
+ * needed if there are more operation modes in the future.
+ */
+static void
+changelog_assign_opmode (changelog_priv_t *priv, char *mode)
+{
+        if ( strncmp (mode, "realtime", 8) == 0 ) {
+                priv->op_mode = CHANGELOG_MODE_RT;
+        }
+}
+
+static void
+changelog_assign_encoding (changelog_priv_t *priv, char *enc)
+{
+        if ( strncmp (enc, "binary", 6) == 0 ) {
+                priv->encode_mode = CHANGELOG_ENCODE_BINARY;
+        } else if ( strncmp (enc, "ascii", 5) == 0 ) {
+                priv->encode_mode = CHANGELOG_ENCODE_ASCII;
+        }
+}
+
+/* cleanup any helper threads that are running */
+static void
+changelog_cleanup_helper_threads (xlator_t *this, changelog_priv_t *priv)
+{
+        if (priv->cr.rollover_th) {
+                changelog_thread_cleanup (this, priv->cr.rollover_th);
+                priv->cr.rollover_th = 0;
+        }
+
+        if (priv->cf.fsync_th) {
+                changelog_thread_cleanup (this, priv->cf.fsync_th);
+                priv->cf.fsync_th = 0;
+        }
+}
+
+/* spawn helper thread; cleaning up in case of errors */
+static int
+changelog_spawn_helper_threads (xlator_t *this, changelog_priv_t *priv)
+{
+        int ret = 0;
+
+        priv->cr.this = this;
+        ret = gf_thread_create (&priv->cr.rollover_th,
+				NULL, changelog_rollover, priv);
+        if (ret)
+                goto out;
+
+        if (priv->fsync_interval) {
+                priv->cf.this = this;
+                ret = gf_thread_create (&priv->cf.fsync_th,
+					NULL, changelog_fsync_thread, priv);
+        }
+
+        if (ret)
+                changelog_cleanup_helper_threads (this, priv);
+
+ out:
+        return ret;
+}
+
+/* cleanup the notifier thread */
+static int
+changelog_cleanup_notifier (xlator_t *this, changelog_priv_t *priv)
+{
+        int ret = 0;
+
+        if (priv->cn.notify_th) {
+                changelog_thread_cleanup (this, priv->cn.notify_th);
+                priv->cn.notify_th = 0;
+
+                ret = close (priv->wfd);
+                if (ret)
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "error closing writer end of notifier pipe"
+                                " (reason: %s)", strerror (errno));
+        }
+
+        return ret;
+}
+
+/* spawn the notifier thread - nop if already running */
+static int
+changelog_spawn_notifier (xlator_t *this, changelog_priv_t *priv)
+{
+        int ret        = 0;
+        int flags      = 0;
+        int pipe_fd[2] = {0, 0};
+
+        if (priv->cn.notify_th)
+                goto out; /* notifier thread already running */
+
+        ret = pipe (pipe_fd);
+        if (ret == -1) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Cannot create pipe (reason: %s)", strerror (errno));
+                goto out;
+        }
+
+        /* writer is non-blocking */
+        flags = fcntl (pipe_fd[1], F_GETFL);
+        flags |= O_NONBLOCK;
+
+        ret = fcntl (pipe_fd[1], F_SETFL, flags);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "failed to set O_NONBLOCK flag");
+                goto out;
+        }
+
+        priv->wfd = pipe_fd[1];
+
+        priv->cn.this = this;
+        priv->cn.rfd  = pipe_fd[0];
+
+        ret = gf_thread_create (&priv->cn.notify_th,
+				NULL, changelog_notifier, priv);
+
+ out:
+        return ret;
+}
+
+int32_t
+mem_acct_init (xlator_t *this)
+{
+        int     ret = -1;
+
+        if (!this)
+                return ret;
+
+        ret = xlator_mem_acct_init (this, gf_changelog_mt_end + 1);
+
+        if (ret != 0) {
+                gf_log (this->name, GF_LOG_WARNING, "Memory accounting"
+                        " init failed");
+                return ret;
+        }
+
+        return ret;
+}
+
+static int
+changelog_init (xlator_t *this, changelog_priv_t *priv)
+{
+        int                  i   = 0;
+        int                  ret = -1;
+        struct timeval       tv  = {0,};
+        changelog_log_data_t cld = {0,};
+
+        ret = gettimeofday (&tv, NULL);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "gettimeofday() failure");
+                goto out;
+        }
+
+        priv->slice.tv_start = tv;
+
+        priv->maps[CHANGELOG_TYPE_DATA]     = "D ";
+        priv->maps[CHANGELOG_TYPE_METADATA] = "M ";
+        priv->maps[CHANGELOG_TYPE_ENTRY]    = "E ";
+
+        for (; i < CHANGELOG_MAX_TYPE; i++) {
+                /* start with version 1 */
+                priv->slice.changelog_version[i] = 1;
+        }
+
+        if (!priv->active)
+                return ret;
+
+        /* spawn the notifier thread */
+        ret = changelog_spawn_notifier (this, priv);
+        if (ret)
+                goto out;
+
+        /**
+         * start with a fresh changelog file every time. this is done
+         * in case there was an encoding change. so... things are kept
+         * simple here.
+         */
+        ret = changelog_fill_rollover_data (&cld, _gf_false);
+        if (ret)
+                goto out;
+
+        LOCK (&priv->lock);
+        {
+                ret = changelog_inject_single_event (this, priv, &cld);
+        }
+        UNLOCK (&priv->lock);
+
+        /* ... and finally spawn the helpers threads */
+        ret = changelog_spawn_helper_threads (this, priv);
+
+ out:
+        return ret;
+}
+
+int
+reconfigure (xlator_t *this, dict_t *options)
+{
+        int                     ret            = 0;
+        char                   *tmp            = NULL;
+        changelog_priv_t       *priv           = NULL;
+        gf_boolean_t            active_earlier = _gf_true;
+        gf_boolean_t            active_now     = _gf_true;
+        changelog_time_slice_t *slice          = NULL;
+        changelog_log_data_t    cld            = {0,};
+
+        priv = this->private;
+        if (!priv)
+                goto out;
+
+        ret = -1;
+        active_earlier = priv->active;
+
+        /* first stop the rollover and the fsync thread */
+        changelog_cleanup_helper_threads (this, priv);
+
+        GF_OPTION_RECONF ("changelog-dir", tmp, options, str, out);
+        if (!tmp) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "\"changelog-dir\" option is not set");
+                goto out;
+        }
+
+        GF_FREE (priv->changelog_dir);
+        priv->changelog_dir = gf_strdup (tmp);
+        if (!priv->changelog_dir)
+                goto out;
+
+        ret = mkdir_p (priv->changelog_dir, 0600, _gf_true);
+        if (ret)
+                goto out;
+
+        GF_OPTION_RECONF ("changelog", active_now, options, bool, out);
+
+        /**
+         * changelog_handle_change() handles changes that could possibly
+         * have been submit changes before changelog deactivation.
+         */
+        if (!active_now)
+                priv->active = _gf_false;
+
+        GF_OPTION_RECONF ("op-mode", tmp, options, str, out);
+        changelog_assign_opmode (priv, tmp);
+
+        tmp = NULL;
+
+        GF_OPTION_RECONF ("encoding", tmp, options, str, out);
+        changelog_assign_encoding (priv, tmp);
+
+        GF_OPTION_RECONF ("rollover-time",
+                          priv->rollover_time, options, int32, out);
+        GF_OPTION_RECONF ("fsync-interval",
+                          priv->fsync_interval, options, int32, out);
+
+        if (active_now || active_earlier) {
+                ret = changelog_fill_rollover_data (&cld, !active_now);
+                if (ret)
+                        goto out;
+
+                slice = &priv->slice;
+
+                LOCK (&priv->lock);
+                {
+                        ret = changelog_inject_single_event (this, priv, &cld);
+                        if (!ret && active_now)
+                                SLICE_VERSION_UPDATE (slice);
+                }
+                UNLOCK (&priv->lock);
+
+                if (ret)
+                        goto out;
+
+                if (active_now) {
+                        ret = changelog_spawn_notifier (this, priv);
+                        if (!ret)
+                                ret = changelog_spawn_helper_threads (this,
+                                                                      priv);
+                } else
+                        ret = changelog_cleanup_notifier (this, priv);
+        }
+
+ out:
+        if (ret) {
+                ret = changelog_cleanup_notifier (this, priv);
+        } else {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "changelog reconfigured");
+                if (active_now)
+                        priv->active = _gf_true;
+        }
+
+        return ret;
+}
+
+int32_t
+init (xlator_t *this)
+{
+        int               ret  = -1;
+        char             *tmp  = NULL;
+        changelog_priv_t *priv = NULL;
+
+        GF_VALIDATE_OR_GOTO ("changelog", this, out);
+
+        if (!this->children || this->children->next) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "translator needs a single subvolume");
+                goto out;
+        }
+
+        if (!this->parents) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "dangling volume. please check volfile");
+                goto out;
+        }
+
+        priv = GF_CALLOC (1, sizeof (*priv), gf_changelog_mt_priv_t);
+        if (!priv)
+                goto out;
+
+        this->local_pool = mem_pool_new (changelog_local_t, 64);
+        if (!this->local_pool) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "failed to create local memory pool");
+                goto out;
+        }
+
+        LOCK_INIT (&priv->lock);
+
+        GF_OPTION_INIT ("changelog-brick", tmp, str, out);
+        if (!tmp) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "\"changelog-brick\" option is not set");
+                goto out;
+        }
+
+        priv->changelog_brick = gf_strdup (tmp);
+        if (!priv->changelog_brick)
+                goto out;
+        tmp = NULL;
+
+        GF_OPTION_INIT ("changelog-dir", tmp, str, out);
+        if (!tmp) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "\"changelog-dir\" option is not set");
+                goto out;
+        }
+
+        priv->changelog_dir = gf_strdup (tmp);
+        if (!priv->changelog_dir)
+                goto out;
+        tmp = NULL;
+
+        /**
+         * create the directory even if change-logging would be inactive
+         * so that consumers can _look_ into it (finding nothing...)
+         */
+        ret = mkdir_p (priv->changelog_dir, 0600, _gf_true);
+        if (ret)
+                goto out;
+
+        GF_OPTION_INIT ("changelog", priv->active, bool, out);
+
+        GF_OPTION_INIT ("op-mode", tmp, str, out);
+        changelog_assign_opmode (priv, tmp);
+
+        tmp = NULL;
+
+        GF_OPTION_INIT ("encoding", tmp, str, out);
+        changelog_assign_encoding (priv, tmp);
+
+        GF_OPTION_INIT ("rollover-time", priv->rollover_time, int32, out);
+
+        GF_OPTION_INIT ("fsync-interval", priv->fsync_interval, int32, out);
+
+        changelog_encode_change(priv);
+
+        GF_ASSERT (cb_bootstrap[priv->op_mode].mode == priv->op_mode);
+        priv->cb = &cb_bootstrap[priv->op_mode];
+
+        /* ... now bootstrap the logger */
+        ret = priv->cb->ctor (this, &priv->cd);
+        if (ret)
+                goto out;
+
+        priv->changelog_fd = -1;
+        ret = changelog_init (this, priv);
+        if (ret)
+                goto out;
+
+        gf_log (this->name, GF_LOG_DEBUG, "changelog translator loaded");
+
+ out:
+        if (ret) {
+                if (this->local_pool)
+                        mem_pool_destroy (this->local_pool);
+                if (priv->cb) {
+                        ret = priv->cb->dtor (this, &priv->cd);
+                        if (ret)
+                                gf_log (this->name, GF_LOG_ERROR,
+                                        "error in cleanup during init()");
+                }
+                GF_FREE (priv->changelog_brick);
+                GF_FREE (priv->changelog_dir);
+                GF_FREE (priv);
+                this->private = NULL;
+        } else
+                this->private = priv;
+
+        return ret;
+}
+
+void
+fini (xlator_t *this)
+{
+        int               ret  = -1;
+        changelog_priv_t *priv = NULL;
+
+        priv = this->private;
+
+        if (priv) {
+                ret = priv->cb->dtor (this, &priv->cd);
+                if (ret)
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "error in fini");
+                mem_pool_destroy (this->local_pool);
+                GF_FREE (priv->changelog_brick);
+                GF_FREE (priv->changelog_dir);
+                GF_FREE (priv);
+        }
+
+        this->private = NULL;
+
+        return;
+}
+
+struct xlator_fops fops = {
+        .mknod        = changelog_mknod,
+        .mkdir        = changelog_mkdir,
+        .create       = changelog_create,
+        .symlink      = changelog_symlink,
+        .writev       = changelog_writev,
+        .truncate     = changelog_truncate,
+        .ftruncate    = changelog_ftruncate,
+        .link         = changelog_link,
+        .rename       = changelog_rename,
+        .unlink       = changelog_unlink,
+        .rmdir        = changelog_rmdir,
+        .setattr      = changelog_setattr,
+        .fsetattr     = changelog_fsetattr,
+        .setxattr     = changelog_setxattr,
+        .fsetxattr    = changelog_fsetxattr,
+        .removexattr  = changelog_removexattr,
+        .fremovexattr = changelog_fremovexattr,
+};
+
+struct xlator_cbks cbks = {
+        .forget = changelog_forget,
+};
+
+struct volume_options options[] = {
+        {.key = {"changelog"},
+         .type = GF_OPTION_TYPE_BOOL,
+         .default_value = "off",
+         .description = "enable/disable change-logging"
+        },
+        {.key = {"changelog-brick"},
+         .type = GF_OPTION_TYPE_PATH,
+         .description = "brick path to generate unique socket file name."
+                       " should be the export directory of the volume strictly."
+        },
+        {.key = {"changelog-dir"},
+         .type = GF_OPTION_TYPE_PATH,
+         .description = "directory for the changelog files"
+        },
+        {.key = {"op-mode"},
+         .type = GF_OPTION_TYPE_STR,
+         .default_value = "realtime",
+         .value = {"realtime"},
+         .description = "operation mode - futuristic operation modes"
+        },
+        {.key = {"encoding"},
+         .type = GF_OPTION_TYPE_STR,
+         .default_value = "ascii",
+         .value = {"binary", "ascii"},
+         .description = "encoding type for changelogs"
+        },
+        {.key = {"rollover-time"},
+         .default_value = "60",
+         .type = GF_OPTION_TYPE_TIME,
+         .description = "time to switch to a new changelog file (in seconds)"
+        },
+        {.key = {"fsync-interval"},
+         .type = GF_OPTION_TYPE_TIME,
+         .default_value = "0",
+         .description = "do not open CHANGELOG file with O_SYNC mode."
+                        " instead perform fsync() at specified intervals"
+        },
+        {.key = {NULL}
+        },
+};
diff --git a/xlators/features/compress/Makefile.am b/xlators/features/compress/Makefile.am
new file mode 100644
index 000000000..a985f42a8
--- /dev/null
+++ b/xlators/features/compress/Makefile.am
@@ -0,0 +1,3 @@
+SUBDIRS = src
+
+CLEANFILES =
diff --git a/xlators/features/compress/src/Makefile.am b/xlators/features/compress/src/Makefile.am
new file mode 100644
index 000000000..4a64b52a9
--- /dev/null
+++ b/xlators/features/compress/src/Makefile.am
@@ -0,0 +1,17 @@
+xlator_LTLIBRARIES = cdc.la
+
+xlatordir = $(libdir)/glusterfs/$(PACKAGE_VERSION)/xlator/features
+
+noinst_HEADERS = cdc.h cdc-mem-types.h
+
+cdc_la_LDFLAGS = -module -avoidversion $(LIBZ_LIBS)
+
+cdc_la_SOURCES = cdc.c cdc-helper.c
+cdc_la_LIBADD = $(top_builddir)/libglusterfs/src/libglusterfs.la
+
+AM_CPPFLAGS = $(GF_CPPFLAGS) -I$(top_srcdir)/libglusterfs/src -fPIC -D_FILE_OFFSET_BITS=64 -D_GNU_SOURCE -D$(GF_HOST_OS) \
+-shared -nostartfiles  $(LIBZ_CFLAGS)
+
+AM_CFLAGS = -Wall $(GF_CFLAGS)
+
+CLEANFILES =
diff --git a/xlators/features/compress/src/cdc-helper.c b/xlators/features/compress/src/cdc-helper.c
new file mode 100644
index 000000000..54432ff45
--- /dev/null
+++ b/xlators/features/compress/src/cdc-helper.c
@@ -0,0 +1,547 @@
+/*
+   Copyright (c) 2013 Red Hat, Inc. <http://www.redhat.com>
+   This file is part of GlusterFS.
+
+   This file is licensed to you under your choice of the GNU Lesser
+   General Public License, version 3 or any later version (LGPLv3 or
+   later), or the GNU General Public License, version 2 (GPLv2), in all
+   cases as published by the Free Software Foundation.
+*/
+
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+
+#include "glusterfs.h"
+#include "logging.h"
+
+#include "cdc.h"
+#include "cdc-mem-types.h"
+
+#ifdef HAVE_LIB_Z
+#include "zlib.h"
+#endif
+
+#ifdef HAVE_LIB_Z
+/* gzip header looks something like this
+ * (RFC 1950)
+ *
+ * +---+---+---+---+---+---+---+---+---+---+
+ * |ID1|ID2|CM |FLG|     MTIME     |XFL|OS |
+ * +---+---+---+---+---+---+---+---+---+---+
+ *
+ * Data is usually sent without this header i.e
+ * Data sent = <compressed-data> + trailer(8)
+ * The trailer contains the checksum.
+ *
+ * gzip_header is added only during debugging.
+ * Refer to the function cdc_dump_iovec_to_disk
+ */
+static const char gzip_header[10] =
+        {
+                '\037', '\213', Z_DEFLATED, 0,
+                0,      0,      0,          0,
+                0,      GF_CDC_OS_ID
+        };
+
+static int32_t
+cdc_next_iovec (xlator_t *this, cdc_info_t *ci)
+{
+        int ret = -1;
+
+        ci->ncount++;
+        /* check for iovec overflow -- should not happen */
+        if (ci->ncount == MAX_IOVEC) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Zlib output buffer overflow"
+                        " ->ncount (%d) | ->MAX_IOVEC (%d)",
+                        ci->ncount, MAX_IOVEC);
+                goto out;
+        }
+
+        ret = 0;
+
+ out:
+        return ret;
+}
+
+static void
+cdc_put_long (unsigned char *string, unsigned long x)
+{
+        string[0] = (unsigned char) (x & 0xff);
+        string[1] = (unsigned char) ((x & 0xff00) >> 8);
+        string[2] = (unsigned char) ((x & 0xff0000) >> 16);
+        string[3] = (unsigned char) ((x & 0xff000000) >> 24);
+}
+
+static unsigned long
+cdc_get_long (unsigned char *buf)
+{
+        return ((unsigned long) buf[0])
+                | (((unsigned long) buf[1]) << 8)
+                | (((unsigned long) buf[2]) << 16)
+                | (((unsigned long) buf[3]) << 24);
+}
+
+static int32_t
+cdc_init_gzip_trailer (xlator_t *this, cdc_priv_t *priv, cdc_info_t *ci)
+{
+        int   ret = -1;
+        char *buf = NULL;
+
+        ret = cdc_next_iovec (this, ci);
+        if (ret)
+                goto out;
+
+        buf = CURR_VEC(ci).iov_base =
+                (char *) GF_CALLOC (1, GF_CDC_VALIDATION_SIZE,
+                                    gf_cdc_mt_gzip_trailer_t);
+
+        if (!CURR_VEC(ci).iov_base)
+                goto out;
+
+        CURR_VEC(ci).iov_len = GF_CDC_VALIDATION_SIZE;
+
+        cdc_put_long ((unsigned char *)&buf[0], ci->crc);
+        cdc_put_long ((unsigned char *)&buf[4], ci->stream.total_in);
+
+        ret = 0;
+
+ out:
+        return ret;
+}
+
+static int32_t
+cdc_alloc_iobuf_and_init_vec (xlator_t *this,
+                              cdc_priv_t *priv, cdc_info_t *ci,
+                              int size)
+{
+        int           ret       = -1;
+        int           alloc_len = 0;
+        struct iobuf *iobuf     = NULL;
+
+        ret = cdc_next_iovec (this, ci);
+        if (ret)
+                goto out;
+
+        alloc_len = size ? size : ci->buffer_size;
+
+        iobuf = iobuf_get2 (this->ctx->iobuf_pool, alloc_len);
+        if (!iobuf)
+                goto out;
+
+        ret = iobref_add (ci->iobref, iobuf);
+        if (ret)
+                goto out;
+
+        /* Initialize this iovec */
+        CURR_VEC(ci).iov_base = iobuf->ptr;
+        CURR_VEC(ci).iov_len  = alloc_len;
+
+        ret = 0;
+
+ out:
+        return ret;
+}
+
+static void
+cdc_init_zlib_output_stream (cdc_priv_t *priv, cdc_info_t *ci, int size)
+{
+        ci->stream.next_out  = (unsigned char *) CURR_VEC(ci).iov_base;
+        ci->stream.avail_out = size ? size : ci->buffer_size;
+}
+
+/* This routine is for testing and debugging only.
+ * Data written = header(10) + <compressed-data> + trailer(8)
+ * So each gzip dump file is at least 18 bytes in size.
+ */
+void
+cdc_dump_iovec_to_disk (xlator_t *this, cdc_info_t *ci, const char *file)
+{
+        int    i      = 0;
+        int    fd     = 0;
+        size_t writen = 0;
+        size_t total_writen = 0;
+
+        fd = open (file, O_WRONLY|O_CREAT|O_TRUNC, 0777 );
+        if (fd < 0) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Cannot open file: %s", file);
+                return;
+        }
+
+        writen = write (fd, (char *) gzip_header, 10);
+        total_writen += writen;
+        for (i = 0; i < ci->ncount; i++) {
+                writen = write (fd, (char *) ci->vec[i].iov_base, ci->vec[i].iov_len);
+                total_writen += writen;
+        }
+
+        gf_log (this->name, GF_LOG_DEBUG,
+                        "dump'd %zu bytes to %s", total_writen, GF_CDC_DEBUG_DUMP_FILE );
+
+        close (fd);
+}
+
+static int32_t
+cdc_flush_libz_buffer (cdc_priv_t *priv, xlator_t *this, cdc_info_t *ci,
+                       int (*libz_func)(z_streamp, int),
+                       int flush)
+{
+        int32_t ret = Z_OK;
+        int done = 0;
+        unsigned int deflate_len = 0;
+
+        for (;;) {
+                deflate_len = ci->buffer_size - ci->stream.avail_out;
+
+                if (deflate_len != 0) {
+                        CURR_VEC(ci).iov_len = deflate_len;
+
+                        ret = cdc_alloc_iobuf_and_init_vec (this, priv, ci, 0);
+                        if (ret) {
+                                ret = Z_MEM_ERROR;
+                                break;
+                        }
+
+                        /* Re-position Zlib output buffer */
+                        cdc_init_zlib_output_stream (priv, ci, 0);
+                }
+
+                if (done) {
+                        ci->ncount--;
+                        break;
+                }
+
+                ret = libz_func (&ci->stream, flush);
+
+                if (ret == Z_BUF_ERROR) {
+                        ret = Z_OK;
+                        ci->ncount--;
+                        break;
+                }
+
+                done = (ci->stream.avail_out != 0 || ret == Z_STREAM_END);
+
+                if (ret != Z_OK && ret != Z_STREAM_END)
+                        break;
+        }
+
+        return ret;
+}
+
+static int32_t
+do_cdc_compress (struct iovec *vec, xlator_t *this, cdc_priv_t *priv,
+                 cdc_info_t *ci)
+{
+        int ret = -1;
+
+        /* Initialize defalte */
+        ret = deflateInit2 (&ci->stream, priv->cdc_level, Z_DEFLATED,
+                            priv->window_size, priv->mem_level,
+                            Z_DEFAULT_STRATEGY);
+
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "unable to init Zlib (retval: %d)", ret);
+                goto out;
+        }
+
+        ret = cdc_alloc_iobuf_and_init_vec (this, priv, ci, 0);
+        if (ret)
+                goto out;
+
+        /* setup output buffer */
+        cdc_init_zlib_output_stream (priv, ci, 0);
+
+        /* setup input buffer */
+        ci->stream.next_in  = (unsigned char *) vec->iov_base;
+        ci->stream.avail_in = vec->iov_len;
+
+        ci->crc = crc32 (ci->crc, (const Bytef *) vec->iov_base, vec->iov_len);
+
+        gf_log (this->name, GF_LOG_DEBUG, "crc=%lu len=%d buffer_size=%d",
+                ci->crc, ci->stream.avail_in, ci->buffer_size);
+
+        /* compress !! */
+        while (ci->stream.avail_in != 0) {
+                if (ci->stream.avail_out == 0) {
+
+                        CURR_VEC(ci).iov_len = ci->buffer_size;
+
+                        ret = cdc_alloc_iobuf_and_init_vec (this, priv, ci, 0);
+                        if (ret)
+                                break;
+
+                        /* Re-position Zlib output buffer */
+                        cdc_init_zlib_output_stream (priv, ci, 0);
+                }
+
+                ret = deflate (&ci->stream, Z_NO_FLUSH);
+                if (ret != Z_OK)
+                        break;
+        }
+
+ out:
+        return ret;
+}
+
+int32_t
+cdc_compress (xlator_t *this, cdc_priv_t *priv, cdc_info_t *ci,
+              dict_t **xdata)
+{
+        int ret = -1;
+        int i   = 0;
+
+        ci->iobref = iobref_new ();
+        if (!ci->iobref)
+                goto out;
+
+        if (!*xdata) {
+                *xdata = dict_new ();
+                if (!*xdata) {
+                        gf_log (this->name, GF_LOG_ERROR, "Cannot allocate xdata"
+                                " dict");
+                        goto out;
+                }
+        }
+
+        /* data */
+        for (i = 0; i < ci->count; i++) {
+                ret = do_cdc_compress (&ci->vector[i], this, priv, ci);
+                if (ret != Z_OK)
+                        goto deflate_cleanup_out;
+        }
+
+        /* flush zlib buffer */
+        ret = cdc_flush_libz_buffer (priv, this, ci, deflate, Z_FINISH);
+        if (!(ret == Z_OK || ret == Z_STREAM_END)) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Compression Error: ret (%d)", ret);
+                ret = -1;
+                goto deflate_cleanup_out;
+        }
+
+        /* trailer */
+        ret = cdc_init_gzip_trailer (this, priv, ci);
+        if (ret)
+                goto deflate_cleanup_out;
+
+        gf_log (this->name, GF_LOG_DEBUG,
+                "Compressed %ld to %ld bytes",
+                ci->stream.total_in, ci->stream.total_out);
+
+        ci->nbytes = ci->stream.total_out + GF_CDC_VALIDATION_SIZE;
+
+        /* set deflated canary value for identification */
+        ret = dict_set_int32 (*xdata, GF_CDC_DEFLATE_CANARY_VAL, 1);
+        if (ret) {
+                /* Send uncompressed data if we can't _tell_ the client
+                 * that deflated data is on it's way. So, we just log
+                 * the faliure and continue as usual.
+                 */
+                 gf_log (this->name, GF_LOG_ERROR,
+                 "Data deflated, but could not set canary"
+                 " value in dict for identification");
+        }
+
+        /* This is to be used in testing */
+        if ( priv->debug ) {
+                cdc_dump_iovec_to_disk (this, ci, GF_CDC_DEBUG_DUMP_FILE );
+        }
+
+ deflate_cleanup_out:
+        (void) deflateEnd(&ci->stream);
+
+ out:
+        return ret;
+}
+
+
+/* deflate content is checked by the presence of a canary
+ * value in the dict as the key
+ */
+static int32_t
+cdc_check_content_for_deflate (dict_t *xdata)
+{
+        return dict_get (xdata, GF_CDC_DEFLATE_CANARY_VAL) ? -1 : 0;
+}
+
+static unsigned long
+cdc_extract_crc (char *trailer)
+{
+        return cdc_get_long ((unsigned char *) &trailer[0]);
+}
+
+static unsigned long
+cdc_extract_size (char *trailer)
+{
+        return cdc_get_long ((unsigned char *) &trailer[4]);
+}
+
+static int32_t
+cdc_validate_inflate (cdc_info_t *ci, unsigned long crc,
+                      unsigned long len)
+{
+        return !((crc == ci->crc)
+                 /* inflated length is hidden inside
+                  * Zlib stream struct */
+                 && (len == ci->stream.total_out));
+}
+
+static int32_t
+do_cdc_decompress (xlator_t *this, cdc_priv_t *priv, cdc_info_t *ci)
+{
+        int            ret          = -1;
+        int            i            = 0;
+        int            len          = 0;
+        char          *inflte       = NULL;
+        char          *trailer      = NULL;
+        struct iovec   vec          = {0,};
+        unsigned long  computed_crc = 0;
+        unsigned long  computed_len = 0;
+
+        ret = inflateInit2 (&ci->stream, priv->window_size);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Zlib: Unable to initialize inflate");
+                goto out;
+        }
+
+        vec = THIS_VEC(ci, 0);
+
+        trailer = (char *) (((char *) vec.iov_base) + vec.iov_len
+                - GF_CDC_VALIDATION_SIZE);
+
+        /* CRC of uncompressed data */
+        computed_crc = cdc_extract_crc (trailer);
+
+        /* size of uncomrpessed data */
+        computed_len = cdc_extract_size (trailer);
+
+        gf_log (this->name, GF_LOG_DEBUG, "crc=%lu len=%lu buffer_size=%d",
+                computed_crc, computed_len, ci->buffer_size);
+
+        inflte = vec.iov_base ;
+        len = vec.iov_len - GF_CDC_VALIDATION_SIZE;
+
+        /* allocate buffer of the original length of the data */
+        ret = cdc_alloc_iobuf_and_init_vec (this, priv, ci, 0);
+        if (ret)
+                goto out;
+
+        /* setup output buffer */
+        cdc_init_zlib_output_stream (priv, ci, 0);
+
+        /* setup input buffer */
+        ci->stream.next_in = (unsigned char *) inflte;
+        ci->stream.avail_in = len;
+
+        while (ci->stream.avail_in != 0) {
+                if (ci->stream.avail_out == 0) {
+                        CURR_VEC(ci).iov_len = ci->buffer_size;
+
+                        ret = cdc_alloc_iobuf_and_init_vec (this, priv, ci, 0);
+                        if (ret)
+                                break;
+
+                        /* Re-position Zlib output buffer */
+                        cdc_init_zlib_output_stream (priv, ci, 0);
+                }
+
+                ret = inflate (&ci->stream, Z_NO_FLUSH);
+                if (ret == Z_STREAM_ERROR)
+                        break;
+        }
+
+        /* flush zlib buffer */
+        ret = cdc_flush_libz_buffer (priv, this, ci, inflate, Z_SYNC_FLUSH);
+        if (!(ret == Z_OK || ret == Z_STREAM_END)) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Decompression Error: ret (%d)", ret);
+                ret = -1;
+                goto out;
+        }
+
+        /* compute CRC of the uncompresses data to check for
+         * correctness */
+
+        for (i = 0; i < ci->ncount; i++) {
+                ci->crc = crc32 (ci->crc,
+                                 (const Bytef *) ci->vec[i].iov_base,
+                                 ci->vec[i].iov_len);
+        }
+
+        /* validate inflated data */
+        ret = cdc_validate_inflate (ci, computed_crc, computed_len);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Checksum or length mismatched in inflated data");
+        }
+
+ out:
+        return ret;
+}
+
+int32_t
+cdc_decompress (xlator_t *this, cdc_priv_t *priv, cdc_info_t *ci,
+                dict_t *xdata)
+{
+        int32_t ret = -1;
+
+        /* check for deflate content */
+        if (!cdc_check_content_for_deflate (xdata)) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "Content not deflated, passing through ...");
+                goto passthrough_out;
+        }
+
+        ci->iobref = iobref_new ();
+        if (!ci->iobref)
+                goto passthrough_out;
+
+        /* do we need to do this? can we assume that one iovec
+         * will hold per request data everytime?
+         *
+         * server/client protocol seems to deal with a single
+         * iovec even if op_ret > 1M. So, it looks ok to
+         * assume that a single iovec will contain all the
+         * data (This saves us a lot from finding the trailer
+         * and the data since it could have been split-up onto
+         * two adjacent iovec's.
+         *
+         * But, in case this translator is loaded above quick-read
+         * for some reason, then it's entirely possible that we get
+         * multiple iovec's...
+         *
+         * This case (handled below) is not tested. (by loading the
+         * xlator below quick-read)
+         */
+
+        /* @@ I_HOPE_THIS_IS_NEVER_HIT */
+        if (ci->count > 1) {
+                gf_log (this->name, GF_LOG_WARNING, "unable to handle"
+                        " multiple iovecs (%d in number)", ci->count);
+                goto inflate_cleanup_out;
+                /* TODO: coallate all iovecs in one */
+        }
+
+        ret = do_cdc_decompress (this, priv, ci);
+        if (ret)
+                goto inflate_cleanup_out;
+
+        ci->nbytes = ci->stream.total_out;
+
+        gf_log (this->name, GF_LOG_DEBUG,
+                "Inflated %ld to %ld bytes",
+                ci->stream.total_in, ci->stream.total_out);
+
+ inflate_cleanup_out:
+        (void) inflateEnd (&ci->stream);
+
+ passthrough_out:
+        return ret;
+}
+
+#endif
diff --git a/xlators/features/compress/src/cdc-mem-types.h b/xlators/features/compress/src/cdc-mem-types.h
new file mode 100644
index 000000000..efa008059
--- /dev/null
+++ b/xlators/features/compress/src/cdc-mem-types.h
@@ -0,0 +1,22 @@
+/*
+   Copyright (c) 2013 Red Hat, Inc. <http://www.redhat.com>
+   This file is part of GlusterFS.
+
+   This file is licensed to you under your choice of the GNU Lesser
+   General Public License, version 3 or any later version (LGPLv3 or
+   later), or the GNU General Public License, version 2 (GPLv2), in all
+   cases as published by the Free Software Foundation.
+*/
+
+#ifndef __CDC_MEM_TYPES_H
+#define __CDC_MEM_TYPES_H
+
+#include "mem-types.h"
+
+enum gf_cdc_mem_types {
+        gf_cdc_mt_priv_t         = gf_common_mt_end + 1,
+        gf_cdc_mt_vec_t          = gf_common_mt_end + 2,
+        gf_cdc_mt_gzip_trailer_t = gf_common_mt_end + 3,
+};
+
+#endif
diff --git a/xlators/features/compress/src/cdc.c b/xlators/features/compress/src/cdc.c
new file mode 100644
index 000000000..eb7d87c56
--- /dev/null
+++ b/xlators/features/compress/src/cdc.c
@@ -0,0 +1,342 @@
+/*
+   Copyright (c) 2013 Red Hat, Inc. <http://www.redhat.com>
+   This file is part of GlusterFS.
+
+   This file is licensed to you under your choice of the GNU Lesser
+   General Public License, version 3 or any later version (LGPLv3 or
+   later), or the GNU General Public License, version 2 (GPLv2), in all
+   cases as published by the Free Software Foundation.
+*/
+
+#include <sys/uio.h>
+
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+
+#include "xlator.h"
+#include "defaults.h"
+#include "logging.h"
+
+#include "cdc.h"
+#include "cdc-mem-types.h"
+
+static void
+cdc_cleanup_iobref (cdc_info_t *ci)
+{
+        assert(ci->iobref != NULL);
+        iobref_clear (ci->iobref);
+}
+
+int32_t
+cdc_readv_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+               int32_t op_ret, int32_t op_errno,
+               struct iovec *vector, int32_t count,
+               struct iatt *stbuf, struct iobref *iobref,
+               dict_t *xdata)
+{
+        int         ret   = -1;
+        cdc_priv_t *priv  = NULL;
+        cdc_info_t  ci    = {0,};
+
+        GF_VALIDATE_OR_GOTO ("cdc", this, default_out);
+        GF_VALIDATE_OR_GOTO (this->name, frame, default_out);
+
+        priv = this->private;
+
+        if (op_ret <= 0)
+                goto default_out;
+
+        if ( (priv->min_file_size != 0)
+             && (op_ret < priv->min_file_size) )
+                goto default_out;
+
+        ci.count       = count;
+        ci.ibytes      = op_ret;
+        ci.vector      = vector;
+        ci.buf         = NULL;
+        ci.iobref      = NULL;
+        ci.ncount      = 0;
+        ci.crc         = 0;
+        ci.buffer_size = GF_CDC_DEF_BUFFERSIZE;
+
+/* A readv compresses on the server side and decompresses on the client side
+ */
+        if (priv->op_mode == GF_CDC_MODE_SERVER) {
+                ret = cdc_compress (this, priv, &ci, &xdata);
+        } else if (priv->op_mode == GF_CDC_MODE_CLIENT) {
+                ret = cdc_decompress (this, priv, &ci, xdata);
+        } else {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Invalid operation mode (%d)", priv->op_mode);
+        }
+
+        if (ret)
+                goto default_out;
+
+        STACK_UNWIND_STRICT (readv, frame, ci.nbytes, op_errno,
+                             ci.vec, ci.ncount, stbuf, iobref,
+                             xdata);
+        cdc_cleanup_iobref (&ci);
+        return 0;
+
+ default_out:
+        STACK_UNWIND_STRICT (readv, frame, op_ret, op_errno,
+                             vector, count, stbuf, iobref, xdata);
+        return 0;
+}
+
+int32_t
+cdc_readv (call_frame_t *frame, xlator_t *this,
+           fd_t *fd, size_t size, off_t offset, uint32_t flags,
+           dict_t *xdata)
+{
+        fop_readv_cbk_t cbk = NULL;
+
+#ifdef HAVE_LIB_Z
+        cbk = cdc_readv_cbk;
+#else
+        cbk = default_readv_cbk;
+#endif
+        STACK_WIND (frame, cbk, FIRST_CHILD(this),
+                    FIRST_CHILD(this)->fops->readv,
+                    fd, size, offset, flags, xdata);
+        return 0;
+}
+
+int32_t
+cdc_writev_cbk (call_frame_t *frame,
+                void *cookie,
+                xlator_t *this,
+                int32_t op_ret,
+                int32_t op_errno,
+                struct iatt *prebuf,
+                struct iatt *postbuf, dict_t *xdata)
+{
+
+	STACK_UNWIND_STRICT (writev, frame, op_ret, op_errno, prebuf, postbuf, xdata);
+	return 0;
+}
+
+int32_t
+cdc_writev (call_frame_t *frame,
+            xlator_t *this,
+            fd_t *fd,
+            struct iovec *vector,
+            int32_t count,
+            off_t offset,
+            uint32_t flags,
+            struct iobref *iobref, dict_t *xdata)
+{
+	int	     ret   = -1;
+	cdc_priv_t  *priv  = NULL;
+	cdc_info_t   ci    = {0,};
+	size_t       isize = 0;
+
+	GF_VALIDATE_OR_GOTO ("cdc", this, default_out);
+	GF_VALIDATE_OR_GOTO (this->name, frame, default_out);
+
+	priv = this->private;
+
+	isize =  iov_length(vector, count);
+
+	if (isize <= 0)
+                goto default_out;
+
+        if ( (priv->min_file_size != 0)
+             && (isize < priv->min_file_size) )
+                goto default_out;
+
+        ci.count       = count;
+        ci.ibytes      = isize;
+        ci.vector      = vector;
+        ci.buf         = NULL;
+        ci.iobref      = NULL;
+        ci.ncount      = 0;
+        ci.crc         = 0;
+        ci.buffer_size = GF_CDC_DEF_BUFFERSIZE;
+
+/* A writev compresses on the client side and decompresses on the server side
+ */
+	if (priv->op_mode == GF_CDC_MODE_CLIENT) {
+		ret = cdc_compress (this, priv, &ci, &xdata);
+	} else if (priv->op_mode == GF_CDC_MODE_SERVER) {
+		ret = cdc_decompress (this, priv, &ci, xdata);
+	} else {
+		gf_log (this->name, GF_LOG_ERROR, "Invalid operation mode (%d) ", priv->op_mode);
+	}
+
+	if (ret)
+		goto default_out;
+
+	STACK_WIND (frame,
+                    cdc_writev_cbk,
+                    FIRST_CHILD (this),
+                    FIRST_CHILD (this)->fops->writev,
+                    fd, ci.vec, ci.ncount, offset, flags,
+                    iobref, xdata);
+
+        cdc_cleanup_iobref (&ci);
+        return 0;
+
+ default_out:
+	STACK_WIND (frame,
+                    cdc_writev_cbk,
+                    FIRST_CHILD (this),
+                    FIRST_CHILD (this)->fops->writev,
+                    fd, vector, count, offset, flags,
+                    iobref, xdata);
+	return 0;
+}
+
+int32_t
+init (xlator_t *this)
+{
+        int         ret      = -1;
+        char       *temp_str = NULL;
+        cdc_priv_t *priv     = NULL;
+
+        GF_VALIDATE_OR_GOTO ("cdc", this, err);
+
+        if (!this->children || this->children->next) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Need subvolume == 1");
+                goto err;
+        }
+
+        if (!this->parents) {
+                gf_log (this->name, GF_LOG_WARNING,
+                        "Dangling volume. Check volfile");
+        }
+
+        priv = GF_CALLOC (1, sizeof (*priv), gf_cdc_mt_priv_t);
+        if (!priv) {
+                goto err;
+        }
+
+        /* Check if debug mode is turned on */
+        GF_OPTION_INIT ("debug", priv->debug, bool, err);
+        if( priv->debug ) {
+                gf_log (this->name, GF_LOG_DEBUG, "CDC debug option turned on");
+        }
+
+        /* Set Gzip Window Size */
+        GF_OPTION_INIT ("window-size", priv->window_size, int32, err);
+        if ( (priv->window_size > GF_CDC_MAX_WINDOWSIZE)
+             || (priv->window_size < GF_CDC_DEF_WINDOWSIZE) ) {
+                gf_log (this->name, GF_LOG_WARNING,
+                        "Invalid gzip window size (%d), using default",
+                        priv->window_size);
+                priv->window_size = GF_CDC_DEF_WINDOWSIZE;
+        }
+
+        /* Set Gzip (De)Compression Level */
+        GF_OPTION_INIT ("compression-level", priv->cdc_level, int32, err);
+        if ( ((priv->cdc_level < 1) || (priv->cdc_level > 9))
+             && (priv->cdc_level != GF_CDC_DEF_COMPRESSION) ) {
+                gf_log (this->name, GF_LOG_WARNING,
+                        "Invalid gzip (de)compression level (%d),"
+                        " using default", priv->cdc_level);
+                priv->cdc_level = GF_CDC_DEF_COMPRESSION;
+        }
+
+        /* Set Gzip Memory Level */
+        GF_OPTION_INIT ("mem-level", priv->mem_level, int32, err);
+        if ( (priv->mem_level < 1) || (priv->mem_level > 9) ) {
+                gf_log (this->name, GF_LOG_WARNING,
+                        "Invalid gzip memory level, using the default");
+                priv->mem_level = GF_CDC_DEF_MEMLEVEL;
+        }
+
+        /* Set min file size to enable compression */
+        GF_OPTION_INIT ("min-size", priv->min_file_size, int32, err);
+
+        /* Mode of operation - Server/Client */
+        ret = dict_get_str (this->options, "mode", &temp_str);
+        if (ret) {
+                gf_log (this->name, GF_LOG_CRITICAL,
+                        "Operation mode not specified !!");
+                goto err;
+        }
+
+        if (GF_CDC_MODE_IS_CLIENT (temp_str)) {
+                priv->op_mode = GF_CDC_MODE_CLIENT;
+        } else if (GF_CDC_MODE_IS_SERVER (temp_str)) {
+                priv->op_mode = GF_CDC_MODE_SERVER;
+        } else {
+                gf_log (this->name, GF_LOG_CRITICAL,
+                        "Bogus operation mode (%s) specified", temp_str);
+                goto err;
+        }
+
+        this->private = priv;
+        gf_log (this->name, GF_LOG_DEBUG, "CDC xlator loaded in (%s) mode",temp_str);
+        return 0;
+
+ err:
+        if (priv)
+                GF_FREE (priv);
+
+        return -1;
+}
+
+void
+fini (xlator_t *this)
+{
+        cdc_priv_t *priv = this->private;
+
+        if (priv)
+                GF_FREE (priv);
+        this->private = NULL;
+        return;
+}
+
+struct xlator_fops fops = {
+        .readv  = cdc_readv,
+        .writev = cdc_writev,
+};
+
+struct xlator_cbks cbks = {
+};
+
+struct volume_options options[] = {
+        { .key  = {"window-size"},
+          .default_value = "-15",
+          .type = GF_OPTION_TYPE_INT,
+          .description = "Size of the zlib history buffer."
+        },
+        { .key  = {"mem-level"},
+          .default_value = "8",
+          .type = GF_OPTION_TYPE_INT,
+          .description = "Memory allocated for internal compression state.\
+                          1 uses minimum memory but is slow and reduces \
+                          compression ratio; memLevel=9 uses maximum memory \
+                          for optimal speed. The default value is 8."
+        },
+        { .key  = {"compression-level"},
+          .default_value = "-1",
+          .type = GF_OPTION_TYPE_INT,
+          .description = "Compression levels \
+                          0 : no compression, 1 : best speed, \
+                          9 : best compression, -1 : default compression "
+        },
+        { .key  = {"min-size"},
+          .default_value = "0",
+          .type = GF_OPTION_TYPE_INT,
+          .description = "Data is compressed only when its size exceeds this."
+        },
+        { .key  = {"mode"},
+          .value = {"server", "client"},
+          .type = GF_OPTION_TYPE_STR,
+          .description = "Set on the basis of where the xlator is loaded."
+        },
+        { .key = {"debug"},
+          .default_value = "false",
+          .type = GF_OPTION_TYPE_BOOL,
+          .description = "This is used in testing. Will dump compressed data \
+                          to disk as a gzip file."
+        },
+        { .key  = {NULL}
+        },
+};
diff --git a/xlators/features/compress/src/cdc.h b/xlators/features/compress/src/cdc.h
new file mode 100644
index 000000000..71f4d2317
--- /dev/null
+++ b/xlators/features/compress/src/cdc.h
@@ -0,0 +1,107 @@
+/*
+   Copyright (c) 2013 Red Hat, Inc. <http://www.redhat.com>
+   This file is part of GlusterFS.
+
+   This file is licensed to you under your choice of the GNU Lesser
+   General Public License, version 3 or any later version (LGPLv3 or
+   later), or the GNU General Public License, version 2 (GPLv2), in all
+   cases as published by the Free Software Foundation.
+*/
+
+#ifndef __CDC_H
+#define __CDC_H
+
+#ifdef HAVE_LIB_Z
+#include "zlib.h"
+#endif
+
+#include "xlator.h"
+
+#ifndef MAX_IOVEC
+#define MAX_IOVEC 16
+#endif
+
+typedef struct cdc_priv {
+        int window_size;
+        int mem_level;
+        int cdc_level;
+        int min_file_size;
+        int op_mode;
+        gf_boolean_t debug;
+        gf_lock_t lock;
+} cdc_priv_t;
+
+typedef struct cdc_info {
+        /* input bits */
+        int            count;
+        int32_t        ibytes;
+        struct iovec  *vector;
+        struct iatt   *buf;
+
+        /* output bits */
+        int            ncount;
+        int            nbytes;
+        int            buffer_size;
+        struct iovec   vec[MAX_IOVEC];
+        struct iobref *iobref;
+
+        /* zlib bits */
+#ifdef HAVE_LIB_Z
+        z_stream      stream;
+#endif
+        unsigned long crc;
+} cdc_info_t;
+
+#define NVEC(ci) (ci->ncount - 1)
+#define CURR_VEC(ci) ci->vec[ci->ncount - 1]
+#define THIS_VEC(ci, i) ci->vector[i]
+
+/* Gzip defaults */
+#define GF_CDC_DEF_WINDOWSIZE  -15 /* default value */
+#define GF_CDC_MAX_WINDOWSIZE  -8  /* max value     */
+
+#ifdef HAVE_LIB_Z
+#define GF_CDC_DEF_COMPRESSION Z_DEFAULT_COMPRESSION
+#else
+#define GF_CDC_DEF_COMPRESSION -1
+#endif
+
+#define GF_CDC_DEF_MEMLEVEL    8
+#define GF_CDC_DEF_BUFFERSIZE  262144 // 256K - default compression buffer size
+
+/* Operation mode
+ * If xlator is loaded on client, readv decompresses and writev compresses
+ * If xlator is loaded on server, readv compresses and writev decompresses
+ */
+#define GF_CDC_MODE_CLIENT   0
+#define GF_CDC_MODE_SERVER   1
+
+/* min size of data to do cmpression
+ * 0 == compress even 1byte
+ */
+#define GF_CDC_MIN_CHUNK_SIZE 0
+
+#define GF_CDC_VALIDATION_SIZE 8
+
+#define GF_CDC_OS_ID 0xFF
+#define GF_CDC_DEFLATE_CANARY_VAL "deflate"
+#define GF_CDC_DEBUG_DUMP_FILE "/tmp/cdcdump.gz"
+
+#define GF_CDC_MODE_IS_CLIENT(m) \
+        (strcmp (m, "client") == 0)
+
+#define GF_CDC_MODE_IS_SERVER(m) \
+        (strcmp (m, "server") == 0)
+
+int32_t
+cdc_compress (xlator_t *this,
+              cdc_priv_t *priv,
+              cdc_info_t *ci,
+              dict_t **xdata);
+int32_t
+cdc_decompress (xlator_t *this,
+                cdc_priv_t *priv,
+                cdc_info_t *ci,
+                dict_t *xdata);
+
+#endif
diff --git a/xlators/features/gfid-access/Makefile.am b/xlators/features/gfid-access/Makefile.am
new file mode 100644
index 000000000..af437a64d
--- /dev/null
+++ b/xlators/features/gfid-access/Makefile.am
@@ -0,0 +1 @@
+SUBDIRS = src
diff --git a/xlators/features/gfid-access/src/Makefile.am b/xlators/features/gfid-access/src/Makefile.am
new file mode 100644
index 000000000..db53affaa
--- /dev/null
+++ b/xlators/features/gfid-access/src/Makefile.am
@@ -0,0 +1,15 @@
+xlator_LTLIBRARIES = gfid-access.la
+xlatordir = $(libdir)/glusterfs/$(PACKAGE_VERSION)/xlator/features
+
+gfid_access_la_LDFLAGS = -module -avoid-version
+
+gfid_access_la_SOURCES = gfid-access.c
+gfid_access_la_LIBADD = $(top_builddir)/libglusterfs/src/libglusterfs.la
+
+noinst_HEADERS = gfid-access.h gfid-access-mem-types.h
+
+AM_CPPFLAGS = $(GF_CPPFLAGS) -I$(top_srcdir)/libglusterfs/src
+
+AM_CFLAGS = -Wall $(GF_CFLAGS)
+
+CLEANFILES =
diff --git a/xlators/features/gfid-access/src/gfid-access-mem-types.h b/xlators/features/gfid-access/src/gfid-access-mem-types.h
new file mode 100644
index 000000000..168d67b43
--- /dev/null
+++ b/xlators/features/gfid-access/src/gfid-access-mem-types.h
@@ -0,0 +1,23 @@
+/*
+   Copyright (c) 2013 Red Hat, Inc. <http://www.redhat.com>
+   This file is part of GlusterFS.
+
+   This file is licensed to you under your choice of the GNU Lesser
+   General Public License, version 3 or any later version (LGPLv3 or
+   later), or the GNU General Public License, version 2 (GPLv2), in all
+   cases as published by the Free Software Foundation.
+*/
+
+#ifndef _GFID_ACCESS_MEM_TYPES_H
+#define _GFID_ACCESS_MEM_TYPES_H
+
+#include "mem-types.h"
+
+enum gf_changelog_mem_types {
+        gf_gfid_access_mt_priv_t = gf_common_mt_end + 1,
+        gf_gfid_access_mt_gfid_t,
+        gf_gfid_access_mt_end
+};
+
+#endif
+
diff --git a/xlators/features/gfid-access/src/gfid-access.c b/xlators/features/gfid-access/src/gfid-access.c
new file mode 100644
index 000000000..da0ba7e50
--- /dev/null
+++ b/xlators/features/gfid-access/src/gfid-access.c
@@ -0,0 +1,1172 @@
+/*
+   Copyright (c) 2013 Red Hat, Inc. <http://www.redhat.com>
+   This file is part of GlusterFS.
+
+   This file is licensed to you under your choice of the GNU Lesser
+   General Public License, version 3 or any later version (LGPLv3 or
+   later), or the GNU General Public License, version 2 (GPLv2), in all
+   cases as published by the Free Software Foundation.
+*/
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+
+#include "gfid-access.h"
+#include "inode.h"
+#include "byte-order.h"
+
+
+
+void
+ga_newfile_args_free (ga_newfile_args_t *args)
+{
+        if (!args)
+                goto out;
+
+        GF_FREE (args->bname);
+
+        if (S_ISLNK (args->st_mode) && args->args.symlink.linkpath) {
+                GF_FREE (args->args.symlink.linkpath);
+                args->args.symlink.linkpath = NULL;
+        }
+
+        mem_put (args);
+out:
+        return;
+}
+
+
+void
+ga_heal_args_free (ga_heal_args_t *args)
+{
+        if (!args)
+                goto out;
+
+        GF_FREE (args->bname);
+
+        mem_put (args);
+out:
+        return;
+}
+
+
+ga_newfile_args_t *
+ga_newfile_parse_args (xlator_t *this, data_t *data)
+{
+        ga_newfile_args_t *args     = NULL;
+        ga_private_t      *priv     = NULL;
+        int                len      = 0;
+        int                blob_len = 0;
+        int                min_len  = 0;
+        void              *blob     = NULL;
+
+        priv = this->private;
+
+        blob = data->data;
+        blob_len = data->len;
+
+        min_len = sizeof (args->uid) + sizeof (args->gid) + sizeof (args->gfid)
+                + sizeof (args->st_mode) + 2 + 2;
+        if (blob_len < min_len) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Invalid length: Total length is less "
+                        "than minimum length.");
+                goto err;
+        }
+
+        args = mem_get0 (priv->newfile_args_pool);
+        if (args == NULL)
+                goto err;
+
+        args->uid = ntoh32 (*(uint32_t *)blob);
+        blob += sizeof (uint32_t);
+        blob_len -= sizeof (uint32_t);
+
+        args->gid = ntoh32 (*(uint32_t *)blob);
+        blob += sizeof (uint32_t);
+        blob_len -= sizeof (uint32_t);
+
+        memcpy (args->gfid, blob, sizeof (args->gfid));
+        blob += sizeof (args->gfid);
+        blob_len -= sizeof (args->gfid);
+
+        args->st_mode = ntoh32 (*(uint32_t *)blob);
+        blob += sizeof (uint32_t);
+        blob_len -= sizeof (uint32_t);
+
+        len = strnlen (blob, blob_len);
+        if (len == blob_len)
+        if (len == blob_len) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "gfid: %s. No null byte present.",
+                        args->gfid);
+                goto err;
+        }
+
+        args->bname = GF_CALLOC (1, (len + 1), gf_common_mt_char);
+        if (args->bname == NULL)
+                goto err;
+
+        memcpy (args->bname, blob, (len + 1));
+        blob += (len + 1);
+        blob_len -= (len + 1);
+
+        if (S_ISDIR (args->st_mode)) {
+                if (blob_len < sizeof (uint32_t)) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "gfid: %s. Invalid length",
+                                args->gfid);
+                        goto err;
+                }
+                args->args.mkdir.mode = ntoh32 (*(uint32_t *)blob);
+                blob += sizeof (uint32_t);
+                blob_len -= sizeof (uint32_t);
+
+                if (blob_len < sizeof (uint32_t)) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "gfid: %s. Invalid length",
+                                args->gfid);
+                        goto err;
+                }
+                args->args.mkdir.umask = ntoh32 (*(uint32_t *)blob);
+                blob += sizeof (uint32_t);
+                blob_len -= sizeof (uint32_t);
+                if (blob_len < 0) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "gfid: %s. Invalid length",
+                                args->gfid);
+                        goto err;
+                }
+        } else if (S_ISLNK (args->st_mode)) {
+                len = strnlen (blob, blob_len);
+                if (len == blob_len) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "gfid: %s. Invalid length",
+                                args->gfid);
+                        goto err;
+                }
+                args->args.symlink.linkpath = GF_CALLOC (1, len + 1,
+                                                         gf_common_mt_char);
+                if (args->args.symlink.linkpath == NULL)
+                        goto err;
+
+                memcpy (args->args.symlink.linkpath, blob, (len + 1));
+                blob += (len + 1);
+                blob_len -= (len + 1);
+        } else {
+                if (blob_len < sizeof (uint32_t)) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "gfid: %s. Invalid length",
+                                args->gfid);
+                        goto err;
+                }
+                args->args.mknod.mode = ntoh32 (*(uint32_t *)blob);
+                blob += sizeof (uint32_t);
+                blob_len -= sizeof (uint32_t);
+
+                if (blob_len < sizeof (uint32_t)) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "gfid: %s. Invalid length",
+                                args->gfid);
+                        goto err;
+                }
+                args->args.mknod.rdev = ntoh32 (*(uint32_t *)blob);
+                blob += sizeof (uint32_t);
+                blob_len -= sizeof (uint32_t);
+
+                if (blob_len < sizeof (uint32_t)) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "gfid: %s. Invalid length",
+                                args->gfid);
+                        goto err;
+                }
+                args->args.mknod.umask = ntoh32 (*(uint32_t *)blob);
+                blob += sizeof (uint32_t);
+                blob_len -= sizeof (uint32_t);
+        }
+
+        if (blob_len) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "gfid: %s. Invalid length",
+                        args->gfid);
+                goto err;
+        }
+
+        return args;
+
+err:
+        if (args)
+                ga_newfile_args_free (args);
+
+        return NULL;
+}
+
+ga_heal_args_t *
+ga_heal_parse_args (xlator_t *this, data_t *data)
+{
+        ga_heal_args_t *args     = NULL;
+        ga_private_t   *priv     = NULL;
+        void           *blob     = NULL;
+        int             len      = 0;
+        int             blob_len = 0;
+
+        blob = data->data;
+        blob_len = data->len;
+
+        priv = this->private;
+
+        /* bname should at least contain a character */
+        if (blob_len < (sizeof (args->gfid) + 2))
+                goto err;
+
+        args = mem_get0 (priv->heal_args_pool);
+        if (!args)
+                goto err;
+
+        memcpy (args->gfid, blob, sizeof (args->gfid));
+        blob += sizeof (args->gfid);
+        blob_len -= sizeof (args->gfid);
+
+        len = strnlen (blob, blob_len);
+        if (len == blob_len)
+                goto err;
+
+        args->bname = GF_CALLOC (1, len + 1, gf_common_mt_char);
+        if (!args->bname)
+                goto err;
+
+        memcpy (args->bname, blob, len);
+        blob_len -= (len + 1);
+
+        if (blob_len)
+                goto err;
+
+        return args;
+
+err:
+        if (args)
+                ga_heal_args_free (args);
+
+        return NULL;
+}
+
+static int32_t
+ga_fill_tmp_loc (loc_t *loc, xlator_t *this, char *gfid,
+                 char *bname, dict_t *xdata, loc_t *new_loc)
+{
+        int       ret    = -1;
+        uint64_t  value  = 0;
+        inode_t  *parent = NULL;
+
+        parent = loc->inode;
+        ret = inode_ctx_get (loc->inode, this, &value);
+        if (!ret) {
+                parent = (void *)value;
+        }
+
+        /* parent itself should be looked up */
+        uuid_copy (new_loc->pargfid, parent->gfid);
+        new_loc->parent = inode_ref (parent);
+
+        new_loc->inode = inode_grep (parent->table, parent, bname);
+        if (!new_loc->inode)
+                new_loc->inode = inode_new (parent->table);
+
+        loc_path (new_loc, bname);
+        new_loc->name = basename (new_loc->path);
+
+        /* As GFID would not be set on the entry yet, lets not send entry
+           gfid in the request */
+        /*uuid_copy (new_loc->gfid, (const unsigned char *)gfid); */
+
+        ret = dict_set_static_bin (xdata, "gfid-req", gfid, 16);
+        if (ret < 0)
+                goto out;
+
+        ret = 0;
+
+out:
+        return ret;
+}
+
+
+
+static gf_boolean_t
+__is_gfid_access_dir (uuid_t gfid)
+{
+        uuid_t  aux_gfid;
+
+        memset (aux_gfid, 0, 16);
+        aux_gfid[15] = GF_AUX_GFID;
+
+        if (uuid_compare (gfid, aux_gfid) == 0)
+                return _gf_true;
+
+        return _gf_false;
+}
+
+int32_t
+ga_forget (xlator_t *this, inode_t *inode)
+{
+        int       ret = -1;
+        uint64_t  value = 0;
+        inode_t  *tmp_inode = NULL;
+
+        ret = inode_ctx_del (inode, this, &value);
+        if (ret)
+                goto out;
+
+        tmp_inode = (void *)value;
+        inode_unref (tmp_inode);
+
+out:
+        return 0;
+}
+
+
+static int
+ga_heal_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+             int32_t op_ret, int32_t op_errno,
+             inode_t *inode, struct iatt *stat, dict_t *dict,
+             struct iatt *postparent)
+{
+        call_frame_t *orig_frame = NULL;
+
+        orig_frame = frame->local;
+        frame->local = NULL;
+
+        /* don't worry about inode linking and other stuff. They'll happen on
+         * the next lookup.
+         */
+        STACK_DESTROY (frame->root);
+
+        STACK_UNWIND_STRICT (setxattr, orig_frame, op_ret, op_errno, dict);
+
+        return 0;
+}
+
+static int
+ga_newentry_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                 int32_t op_ret, int32_t op_errno,
+                 inode_t *inode, struct iatt *buf,
+                 struct iatt *preparent, struct iatt *postparent,
+                 dict_t *xdata)
+{
+        call_frame_t *orig_frame = NULL;
+
+        orig_frame = frame->local;
+        frame->local = NULL;
+
+        /* don't worry about inode linking and other stuff. They'll happen on
+         * the next lookup.
+         */
+        STACK_DESTROY (frame->root);
+
+        STACK_UNWIND_STRICT (setxattr, orig_frame, op_ret, op_errno, xdata);
+
+        return 0;
+}
+
+int32_t
+ga_new_entry (call_frame_t *frame, xlator_t *this, loc_t *loc, data_t *data,
+              dict_t *xdata)
+{
+        int                ret       = -1;
+        ga_newfile_args_t *args      = NULL;
+        loc_t              tmp_loc   = {0,};
+        call_frame_t      *new_frame = NULL;
+        mode_t             mode      = 0;
+
+        args = ga_newfile_parse_args (this, data);
+        if (!args)
+                goto out;
+
+        if (!xdata)
+                xdata = dict_new ();
+
+        ret = ga_fill_tmp_loc (loc, this, args->gfid,
+                               args->bname, xdata, &tmp_loc);
+        if (ret)
+                goto out;
+
+        new_frame = copy_frame (frame);
+        if (!new_frame)
+                goto out;
+        new_frame->local = (void *)frame;
+
+        new_frame->root->uid = args->uid;
+        new_frame->root->gid = args->gid;
+
+        if (S_ISDIR (args->st_mode)) {
+                STACK_WIND (new_frame, ga_newentry_cbk,
+                            FIRST_CHILD(this), FIRST_CHILD(this)->fops->mkdir,
+                            &tmp_loc, args->args.mkdir.mode,
+                            args->args.mkdir.umask, xdata);
+        } else if (S_ISLNK (args->st_mode)) {
+                STACK_WIND (new_frame, ga_newentry_cbk,
+                            FIRST_CHILD(this), FIRST_CHILD(this)->fops->symlink,
+                            args->args.symlink.linkpath,
+                            &tmp_loc, 0, xdata);
+        } else {
+                /* use 07777 (4 7s) for considering the Sticky bits etc) */
+                mode = (S_IFMT & args->st_mode) |
+                        (07777 | args->args.mknod.mode);;
+
+                STACK_WIND (new_frame, ga_newentry_cbk,
+                            FIRST_CHILD(this), FIRST_CHILD(this)->fops->mknod,
+                            &tmp_loc, mode,
+                            args->args.mknod.rdev, args->args.mknod.umask,
+                            xdata);
+        }
+
+        ret = 0;
+out:
+        ga_newfile_args_free (args);
+
+        return ret;
+}
+
+int32_t
+ga_heal_entry (call_frame_t *frame, xlator_t *this, loc_t *loc, data_t *data,
+               dict_t *xdata)
+{
+        int             ret       = -1;
+        ga_heal_args_t *args      = NULL;
+        loc_t           tmp_loc   = {0,};
+        call_frame_t   *new_frame = NULL;
+
+        args = ga_heal_parse_args (this, data);
+        if (!args)
+                goto out;
+
+        if (!xdata)
+                xdata = dict_new ();
+
+        ret = ga_fill_tmp_loc (loc, this, args->gfid, args->bname,
+                               xdata, &tmp_loc);
+        if (ret)
+                goto out;
+
+        new_frame = copy_frame (frame);
+        if (!new_frame)
+                goto out;
+        new_frame->local = (void *)frame;
+
+        STACK_WIND (new_frame, ga_heal_cbk, FIRST_CHILD (this),
+                    FIRST_CHILD(this)->fops->lookup,
+                    &tmp_loc, xdata);
+
+        ret = 0;
+out:
+        if (args)
+                ga_heal_args_free (args);
+
+        return ret;
+}
+
+int32_t
+ga_setxattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                 int32_t op_ret, int32_t op_errno,
+                 dict_t *xdata)
+{
+        STACK_UNWIND_STRICT (setxattr, frame, op_ret, op_errno, xdata);
+        return 0;
+}
+
+int32_t
+ga_setxattr (call_frame_t *frame, xlator_t *this, loc_t *loc, dict_t *dict,
+             int32_t flags, dict_t *xdata)
+{
+
+        data_t  *data     = NULL;
+        int      op_errno = ENOMEM;
+        int      ret      = 0;
+        inode_t *unref    = NULL;
+
+        if ((loc->name && !strcmp (GF_GFID_DIR, loc->name)) &&
+            ((loc->parent &&
+              __is_root_gfid (loc->parent->gfid)) ||
+             __is_root_gfid (loc->pargfid))) {
+                op_errno = EPERM;
+                goto err;
+        }
+
+        data = dict_get (dict, GF_FUSE_AUX_GFID_NEWFILE);
+        if (data) {
+                ret = ga_new_entry (frame, this, loc, data, xdata);
+                if (ret)
+                        goto err;
+                return 0;
+        }
+
+        data = dict_get (dict, GF_FUSE_AUX_GFID_HEAL);
+        if (data) {
+                ret = ga_heal_entry (frame, this, loc, data, xdata);
+                if (ret)
+                        goto err;
+                return 0;
+        }
+
+        //If the inode is a virtual inode change the inode otherwise perform
+        //the operation on same inode
+        GFID_ACCESS_GET_VALID_DIR_INODE (this, loc, unref, wind);
+
+wind:
+        STACK_WIND (frame, ga_setxattr_cbk, FIRST_CHILD(this),
+                    FIRST_CHILD(this)->fops->setxattr, loc, dict, flags,
+                    xdata);
+        if (unref)
+                inode_unref (unref);
+
+        return 0;
+err:
+        STACK_UNWIND_STRICT (setxattr, frame, -1, op_errno, xdata);
+        return 0;
+}
+
+
+int32_t
+ga_virtual_lookup_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                       int32_t op_ret, int32_t op_errno, inode_t *inode,
+                       struct iatt *buf, dict_t *xdata, struct iatt *postparent)
+{
+        int       j           = 0;
+        int       i           = 0;
+        int       ret         = 0;
+        uint64_t  temp_ino    = 0;
+        inode_t  *cbk_inode   = NULL;
+        inode_t  *true_inode  = NULL;
+        uuid_t    random_gfid = {0,};
+
+        if (frame->local)
+                cbk_inode = frame->local;
+        else
+                cbk_inode = inode;
+
+        frame->local = NULL;
+        if (op_ret)
+                goto unwind;
+
+        if (!IA_ISDIR (buf->ia_type))
+                goto unwind;
+
+        /* need to send back a different inode for linking in itable */
+        if (cbk_inode == inode) {
+                /* check if the inode is in the 'itable' or
+                   if its just previously discover()'d inode */
+                true_inode = inode_find (inode->table, buf->ia_gfid);
+                if (!true_inode) {
+                        cbk_inode = inode_new (inode->table);
+
+                        if (!cbk_inode) {
+                                op_ret = -1;
+                                op_errno = ENOMEM;
+                                goto unwind;
+                        }
+                        /* the inode is not present in itable, ie, the actual
+                           path is not yet looked up. Use the current inode
+                           itself for now */
+                        inode_ref (inode);
+                } else {
+                        /* 'inode_ref()' has been done in inode_find() */
+                        inode = true_inode;
+                }
+
+                ret = inode_ctx_put (cbk_inode, this, (uint64_t)inode);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_WARNING,
+                                "failed to set the inode ctx with"
+                                "the actual inode");
+                        if (inode)
+                                inode_unref (inode);
+                }
+                inode = NULL;
+        }
+
+        if (!uuid_is_null (cbk_inode->gfid)) {
+                /* if the previous linked inode is used, use the
+                   same gfid */
+                uuid_copy (random_gfid, cbk_inode->gfid);
+        } else {
+                /* replace the buf->ia_gfid to a random gfid
+                   for directory, for files, what we received is fine */
+                uuid_generate (random_gfid);
+        }
+
+        uuid_copy (buf->ia_gfid, random_gfid);
+
+        for (i = 15; i > (15 - 8); i--) {
+                temp_ino += (uint64_t)(buf->ia_gfid[i]) << j;
+                j += 8;
+        }
+        buf->ia_ino = temp_ino;
+
+unwind:
+        STACK_UNWIND_STRICT (lookup, frame, op_ret, op_errno, cbk_inode, buf,
+                             xdata, postparent);
+
+        return 0;
+}
+
+int32_t
+ga_lookup_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+               int32_t op_ret, int32_t op_errno, inode_t *inode,
+               struct iatt *buf, dict_t *xdata, struct iatt *postparent)
+{
+        ga_private_t *priv = NULL;
+
+        /* if the entry in question is not 'root',
+           then follow the normal path */
+        if (op_ret || !__is_root_gfid(buf->ia_gfid))
+                goto unwind;
+
+        priv = this->private;
+
+        /* do we need to copy root stbuf everytime? */
+        /* mostly yes, as we want to have the 'stat' info show latest
+           in every _cbk() */
+
+        /* keep the reference for root stat buf */
+        priv->root_stbuf = *buf;
+        priv->gfiddir_stbuf = priv->root_stbuf;
+        priv->gfiddir_stbuf.ia_gfid[15] = GF_AUX_GFID;
+        priv->gfiddir_stbuf.ia_ino = GF_AUX_GFID;
+
+unwind:
+        STACK_UNWIND_STRICT (lookup, frame, op_ret, op_errno, inode, buf,
+                             xdata, postparent);
+        return 0;
+}
+
+int32_t
+ga_lookup (call_frame_t *frame, xlator_t *this, loc_t *loc, dict_t *xdata)
+{
+        ga_private_t *priv     = NULL;
+        int           ret      = -1;
+        uuid_t        tmp_gfid = {0,};
+        loc_t         tmp_loc  = {0,};
+        uint64_t      value    = 0;
+        inode_t      *inode    = NULL;
+        inode_t      *true_inode    = NULL;
+        int32_t       op_errno = ENOENT;
+
+        /* if its discover(), no need for any action here */
+        if (!loc->name)
+                goto wind;
+
+        /* if its revalidate, and inode is not of type directory,
+           proceed with 'wind' */
+        if (loc->inode && loc->inode->ia_type &&
+            !IA_ISDIR (loc->inode->ia_type))
+                goto wind;
+
+        priv = this->private;
+
+        /* need to check if the lookup is on virtual dir */
+        if ((loc->name && !strcmp (GF_GFID_DIR, loc->name)) &&
+            ((loc->parent && __is_root_gfid (loc->parent->gfid)) ||
+             __is_root_gfid (loc->pargfid))) {
+                /* this means, the query is on '/.gfid', return the fake stat,
+                   and say success */
+
+                STACK_UNWIND_STRICT (lookup, frame, 0, 0, loc->inode,
+                                     &priv->gfiddir_stbuf, xdata,
+                                     &priv->root_stbuf);
+                return 0;
+        }
+
+        /* now, check if the lookup() is on an existing entry,
+           but on gfid-path */
+        if (!((loc->parent && __is_gfid_access_dir (loc->parent->gfid)) ||
+              __is_gfid_access_dir (loc->pargfid)))
+                goto wind;
+
+        /* make sure the 'basename' is actually a 'canonical-gfid',
+           otherwise, return error */
+        ret = uuid_parse (loc->name, tmp_gfid);
+        if (ret)
+                goto err;
+
+        /* if its fresh lookup, go ahead and send it down, if not,
+           for directory, we need indirection to actual dir inode */
+        if (!(loc->inode && loc->inode->ia_type))
+                goto discover;
+
+        /* revalidate on directory */
+        ret = inode_ctx_get (loc->inode, this, &value);
+        if (ret)
+                goto err;
+
+        inode = (void *)value;
+
+        /* valid inode, already looked up, work on that */
+        if (inode->ia_type)
+                goto discover;
+
+        /* check if the inode is in the 'itable' or
+           if its just previously discover()'d inode */
+        true_inode = inode_find (loc->inode->table, tmp_gfid);
+        if (true_inode) {
+                /* time do another lookup and update the context
+                   with proper inode */
+                op_errno = ESTALE;
+                goto err;
+        }
+
+discover:
+        /* for the virtual entries, we don't need to send 'gfid-req' key, as
+           for these entries, we don't want to 'set' a new gfid */
+        if (xdata)
+                dict_del (xdata, "gfid-req");
+
+        uuid_copy (tmp_loc.gfid, tmp_gfid);
+
+        /* if revalidate, then we need to have the proper reference */
+        if (inode) {
+                tmp_loc.inode = inode_ref (inode);
+                frame->local = loc->inode;
+        } else {
+                tmp_loc.inode = inode_ref (loc->inode);
+        }
+
+        STACK_WIND (frame, ga_virtual_lookup_cbk, FIRST_CHILD(this),
+                    FIRST_CHILD(this)->fops->lookup, &tmp_loc, xdata);
+
+        inode_unref (tmp_loc.inode);
+
+        return 0;
+
+wind:
+        /* used for all the normal lookup path */
+        STACK_WIND (frame, ga_lookup_cbk, FIRST_CHILD(this),
+                    FIRST_CHILD(this)->fops->lookup, loc, xdata);
+
+        return 0;
+
+err:
+        STACK_UNWIND_STRICT (lookup, frame, -1, op_errno, loc->inode,
+                             &priv->gfiddir_stbuf, xdata,
+                             &priv->root_stbuf);
+        return 0;
+}
+
+int
+ga_mkdir (call_frame_t *frame, xlator_t *this, loc_t *loc, mode_t mode,
+          mode_t umask, dict_t *xdata)
+{
+        int op_errno = 0;
+
+        GFID_ACCESS_ENTRY_OP_CHECK (loc, op_errno, err);
+
+        STACK_WIND (frame, default_mkdir_cbk, FIRST_CHILD(this),
+                    FIRST_CHILD(this)->fops->mkdir, loc, mode, umask,
+                    xdata);
+
+        return 0;
+
+err:
+        STACK_UNWIND_STRICT (mkdir, frame, -1, op_errno, loc->inode,
+                             NULL, NULL, NULL, xdata);
+        return 0;
+}
+
+
+int
+ga_create (call_frame_t *frame, xlator_t *this, loc_t *loc, int flags,
+           mode_t mode, mode_t umask, fd_t *fd, dict_t *xdata)
+{
+        int op_errno = 0;
+
+        GFID_ACCESS_ENTRY_OP_CHECK (loc, op_errno, err);
+
+        STACK_WIND (frame, default_create_cbk,
+                    FIRST_CHILD(this), FIRST_CHILD(this)->fops->create,
+                    loc, flags, mode, umask, fd, xdata);
+        return 0;
+err:
+        STACK_UNWIND_STRICT (create, frame, -1, op_errno, NULL,
+                             NULL, NULL, NULL, NULL, xdata);
+
+        return 0;
+
+}
+
+int
+ga_symlink (call_frame_t *frame, xlator_t *this, const char *linkname,
+            loc_t *loc, mode_t umask, dict_t *xdata)
+{
+        int op_errno = 0;
+
+        GFID_ACCESS_ENTRY_OP_CHECK (loc, op_errno, err);
+
+        STACK_WIND (frame, default_symlink_cbk,
+                    FIRST_CHILD(this), FIRST_CHILD(this)->fops->symlink,
+                    linkname, loc, umask, xdata);
+        return 0;
+err:
+        STACK_UNWIND_STRICT (symlink, frame, -1, op_errno, NULL,
+                             NULL, NULL, NULL, xdata);
+
+        return 0;
+}
+
+int
+ga_mknod (call_frame_t *frame, xlator_t *this, loc_t *loc, mode_t mode,
+          dev_t rdev, mode_t umask, dict_t *xdata)
+{
+        int op_errno = 0;
+
+        GFID_ACCESS_ENTRY_OP_CHECK (loc, op_errno, err);
+
+        STACK_WIND (frame, default_mknod_cbk, FIRST_CHILD(this),
+                    FIRST_CHILD(this)->fops->mknod, loc, mode, rdev,
+                    umask, xdata);
+
+        return 0;
+err:
+        STACK_UNWIND_STRICT (mknod, frame, -1, op_errno, NULL,
+                             NULL, NULL, NULL, xdata);
+
+        return 0;
+}
+
+int
+ga_rmdir (call_frame_t *frame, xlator_t *this, loc_t *loc, int flag,
+          dict_t *xdata)
+{
+        int op_errno = 0;
+        inode_t *unref = NULL;
+
+        GFID_ACCESS_ENTRY_OP_CHECK (loc, op_errno, err);
+
+        GFID_ACCESS_GET_VALID_DIR_INODE (this, loc, unref, wind);
+
+wind:
+        STACK_WIND (frame, default_rmdir_cbk,
+                    FIRST_CHILD(this), FIRST_CHILD(this)->fops->rmdir,
+                    loc, flag, xdata);
+        if (unref)
+                inode_unref (unref);
+
+        return 0;
+err:
+        STACK_UNWIND_STRICT (rmdir, frame, -1, op_errno, NULL,
+                             NULL, xdata);
+
+        return 0;
+}
+
+int
+ga_unlink (call_frame_t *frame, xlator_t *this, loc_t *loc, int32_t xflag,
+           dict_t *xdata)
+{
+        int op_errno = 0;
+        inode_t *unref = NULL;
+
+        GFID_ACCESS_ENTRY_OP_CHECK (loc, op_errno, err);
+
+        GFID_ACCESS_GET_VALID_DIR_INODE (this, loc, unref, wind);
+
+wind:
+        STACK_WIND (frame, default_unlink_cbk,
+                    FIRST_CHILD(this), FIRST_CHILD(this)->fops->unlink,
+                    loc, xflag, xdata);
+
+        if (unref)
+                inode_unref (unref);
+
+        return 0;
+err:
+        STACK_UNWIND_STRICT (unlink, frame, -1, op_errno, NULL,
+                             NULL, xdata);
+
+        return 0;
+}
+
+int
+ga_rename (call_frame_t *frame, xlator_t *this,
+           loc_t *oldloc, loc_t *newloc, dict_t *xdata)
+{
+        int op_errno = 0;
+        inode_t *oldloc_unref = NULL;
+        inode_t *newloc_unref = NULL;
+
+        GFID_ACCESS_ENTRY_OP_CHECK (oldloc, op_errno, err);
+        GFID_ACCESS_ENTRY_OP_CHECK (newloc, op_errno, err);
+
+        GFID_ACCESS_GET_VALID_DIR_INODE (this, oldloc, oldloc_unref,
+                                         handle_newloc);
+
+handle_newloc:
+        GFID_ACCESS_GET_VALID_DIR_INODE (this, newloc, newloc_unref, wind);
+
+wind:
+        STACK_WIND (frame, default_rename_cbk,
+                    FIRST_CHILD(this), FIRST_CHILD(this)->fops->rename,
+                    oldloc, newloc, xdata);
+
+        if (oldloc_unref)
+                inode_unref (oldloc_unref);
+
+        if (newloc_unref)
+                inode_unref (newloc_unref);
+
+        return 0;
+err:
+        STACK_UNWIND_STRICT (rename, frame, -1, op_errno, NULL,
+                             NULL, NULL, NULL, NULL, xdata);
+
+        return 0;
+}
+
+
+int
+ga_link (call_frame_t *frame, xlator_t *this,
+         loc_t *oldloc, loc_t *newloc, dict_t *xdata)
+{
+        int op_errno = 0;
+        inode_t *oldloc_unref = NULL;
+        inode_t *newloc_unref = NULL;
+
+        GFID_ACCESS_ENTRY_OP_CHECK (oldloc, op_errno, err);
+        GFID_ACCESS_ENTRY_OP_CHECK (newloc, op_errno, err);
+
+        GFID_ACCESS_GET_VALID_DIR_INODE (this, oldloc, oldloc_unref,
+                                         handle_newloc);
+
+handle_newloc:
+        GFID_ACCESS_GET_VALID_DIR_INODE (this, newloc, newloc_unref, wind);
+
+wind:
+        STACK_WIND (frame, default_link_cbk,
+                    FIRST_CHILD(this), FIRST_CHILD(this)->fops->link,
+                    oldloc, newloc, xdata);
+
+        if (oldloc_unref)
+                inode_unref (oldloc_unref);
+
+        if (newloc_unref)
+                inode_unref (newloc_unref);
+
+        return 0;
+err:
+        STACK_UNWIND_STRICT (link, frame, -1, op_errno, NULL,
+                             NULL, NULL, NULL, xdata);
+
+        return 0;
+}
+
+int32_t
+ga_opendir (call_frame_t *frame, xlator_t *this, loc_t *loc,
+            fd_t *fd, dict_t *xdata)
+{
+        int op_errno = 0;
+
+        GFID_ACCESS_ENTRY_OP_CHECK (loc, op_errno, err);
+
+        /* also check if the loc->inode itself is virtual
+           inode, if yes, return with failure, mainly because we
+           can't handle all the readdirp and other things on it. */
+        if (inode_ctx_get (loc->inode, this, NULL) == 0) {
+                op_errno = ENOTSUP;
+                goto err;
+        }
+
+        STACK_WIND (frame, default_opendir_cbk,
+                    FIRST_CHILD(this), FIRST_CHILD(this)->fops->opendir,
+                    loc, fd, xdata);
+        return 0;
+err:
+        STACK_UNWIND_STRICT (opendir, frame, -1, op_errno, NULL, xdata);
+
+        return 0;
+}
+
+int32_t
+ga_getxattr (call_frame_t *frame, xlator_t *this, loc_t *loc,
+             const char *name, dict_t *xdata)
+{
+        inode_t *unref = NULL;
+
+        GFID_ACCESS_GET_VALID_DIR_INODE (this, loc, unref, wind);
+
+wind:
+        STACK_WIND (frame, default_getxattr_cbk, FIRST_CHILD(this),
+                    FIRST_CHILD(this)->fops->getxattr, loc, name, xdata);
+
+        if (unref)
+                inode_unref (unref);
+
+        return 0;
+}
+
+int32_t
+ga_stat (call_frame_t *frame, xlator_t *this, loc_t *loc,
+         dict_t *xdata)
+{
+        inode_t *unref = NULL;
+
+        GFID_ACCESS_GET_VALID_DIR_INODE (this, loc, unref, wind);
+
+wind:
+        STACK_WIND (frame, default_stat_cbk, FIRST_CHILD(this),
+                    FIRST_CHILD(this)->fops->stat, loc, xdata);
+        if (unref)
+                inode_unref (unref);
+
+        return 0;
+}
+
+int32_t
+ga_setattr (call_frame_t *frame, xlator_t *this, loc_t *loc,
+            struct iatt *stbuf, int32_t valid,
+            dict_t *xdata)
+{
+        inode_t *unref = NULL;
+
+        GFID_ACCESS_GET_VALID_DIR_INODE (this, loc, unref, wind);
+
+wind:
+        STACK_WIND (frame, default_setattr_cbk, FIRST_CHILD (this),
+                    FIRST_CHILD (this)->fops->setattr, loc, stbuf, valid,
+                    xdata);
+        if (unref)
+                inode_unref (unref);
+
+        return 0;
+}
+
+int32_t
+ga_removexattr (call_frame_t *frame, xlator_t *this, loc_t *loc,
+                const char *name, dict_t *xdata)
+{
+        inode_t *unref = NULL;
+
+        GFID_ACCESS_GET_VALID_DIR_INODE (this, loc, unref, wind);
+
+wind:
+        STACK_WIND (frame, default_removexattr_cbk, FIRST_CHILD(this),
+                    FIRST_CHILD(this)->fops->removexattr, loc, name,
+                    xdata);
+        if (unref)
+                inode_unref (unref);
+
+        return 0;
+}
+
+
+int32_t
+mem_acct_init (xlator_t *this)
+{
+        int     ret = -1;
+
+        if (!this)
+                return ret;
+
+        ret = xlator_mem_acct_init (this, gf_gfid_access_mt_end + 1);
+
+        if (ret != 0) {
+                gf_log (this->name, GF_LOG_WARNING, "Memory accounting"
+                        " init failed");
+                return ret;
+        }
+
+        return ret;
+}
+
+int32_t
+init (xlator_t *this)
+{
+        ga_private_t *priv = NULL;
+        int ret = -1;
+
+        if (!this->children || this->children->next) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "not configured with exactly one child. exiting");
+                goto out;
+        }
+
+        /* This can be the top of graph in certain cases */
+        if (!this->parents) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "dangling volume. check volfile ");
+        }
+
+        /* TODO: define a mem-type structure */
+        priv = GF_CALLOC (1, sizeof (*priv), gf_gfid_access_mt_priv_t);
+        if (!priv)
+                goto out;
+
+        priv->newfile_args_pool = mem_pool_new (ga_newfile_args_t, 512);
+        if (!priv->newfile_args_pool)
+                goto out;
+
+        priv->heal_args_pool = mem_pool_new (ga_heal_args_t, 512);
+        if (!priv->heal_args_pool)
+                goto out;
+
+        this->private = priv;
+
+        ret = 0;
+out:
+        if (ret && priv) {
+                if (priv->newfile_args_pool)
+                        mem_pool_destroy (priv->newfile_args_pool);
+                GF_FREE (priv);
+        }
+
+        return ret;
+}
+
+void
+fini (xlator_t *this)
+{
+        ga_private_t *priv = NULL;
+        priv = this->private;
+        this->private = NULL;
+
+        if (priv) {
+                if (priv->newfile_args_pool)
+                        mem_pool_destroy (priv->newfile_args_pool);
+                if (priv->heal_args_pool)
+                        mem_pool_destroy (priv->heal_args_pool);
+                GF_FREE (priv);
+        }
+
+        return;
+}
+
+
+struct xlator_fops fops = {
+        .lookup = ga_lookup,
+
+        /* entry fops */
+        .mkdir   = ga_mkdir,
+        .mknod   = ga_mknod,
+        .create  = ga_create,
+        .symlink = ga_symlink,
+        .link    = ga_link,
+        .unlink  = ga_unlink,
+        .rmdir   = ga_rmdir,
+        .rename  = ga_rename,
+
+        /* handle any other directory operations here */
+        .opendir  = ga_opendir,
+        .stat     = ga_stat,
+        .setattr  = ga_setattr,
+        .getxattr = ga_getxattr,
+        .removexattr = ga_removexattr,
+
+        /* special fop to handle more entry creations */
+        .setxattr = ga_setxattr,
+};
+
+struct xlator_cbks cbks = {
+        .forget = ga_forget,
+};
+
+struct volume_options options[] = {
+        /* This translator doesn't take any options, or provide any options */
+        { .key  = {NULL} },
+};
diff --git a/xlators/features/gfid-access/src/gfid-access.h b/xlators/features/gfid-access/src/gfid-access.h
new file mode 100644
index 000000000..e13c9b724
--- /dev/null
+++ b/xlators/features/gfid-access/src/gfid-access.h
@@ -0,0 +1,128 @@
+/*
+   Copyright (c) 2013 Red Hat, Inc. <http://www.redhat.com>
+   This file is part of GlusterFS.
+
+   This file is licensed to you under your choice of the GNU Lesser
+   General Public License, version 3 or any later version (LGPLv3 or
+   later), or the GNU General Public License, version 2 (GPLv2), in all
+   cases as published by the Free Software Foundation.
+*/
+#ifndef __GFID_ACCESS_H__
+#define __GFID_ACCESS_H__
+
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+
+#include "glusterfs.h"
+#include "logging.h"
+#include "dict.h"
+#include "xlator.h"
+#include "defaults.h"
+#include "gfid-access-mem-types.h"
+
+#define UUID_CANONICAL_FORM_LEN 36
+
+#define GF_FUSE_AUX_GFID_NEWFILE "glusterfs.gfid.newfile"
+#define GF_FUSE_AUX_GFID_HEAL    "glusterfs.gfid.heal"
+
+#define GF_GFID_KEY "GLUSTERFS_GFID"
+#define GF_GFID_DIR ".gfid"
+#define GF_AUX_GFID 0xd
+
+#define GFID_ACCESS_GET_VALID_DIR_INODE(x,l,unref,lbl) do {             \
+                int       ret       = 0;                                \
+                uint64_t  value     = 0;                                \
+                inode_t  *tmp_inode = NULL;                             \
+                                                                        \
+                /* if its an entry operation, on the virtual */         \
+                /* directory inode as parent, we need to handle */      \
+                /* it properly */                                       \
+                if (l->parent) {                                        \
+                        ret = inode_ctx_get (l->parent, x, &value);     \
+                        if (ret)                                        \
+                                goto lbl;                               \
+                        tmp_inode = (inode_t *)value;                   \
+                        unref = inode_ref (tmp_inode);                  \
+                        l->parent = tmp_inode;                          \
+                        /* if parent is virtual, no need to handle */   \
+                        /* loc->inode */                                \
+                        break;                                          \
+                }                                                       \
+                                                                        \
+                /* if its an inode operation, on the virtual */         \
+                /* directory inode itself, we need to handle */         \
+                /* it properly */                                       \
+                if (l->inode) {                                         \
+                        ret = inode_ctx_get (l->inode, x, &value);      \
+                        if (ret)                                        \
+                                goto lbl;                               \
+                        tmp_inode = (inode_t *)value;                   \
+                        unref = inode_ref (tmp_inode);                  \
+                        l->inode = tmp_inode;                           \
+                }                                                       \
+                                                                        \
+        } while (0)
+
+#define GFID_ACCESS_ENTRY_OP_CHECK(loc,err,lbl)    do {                 \
+                /* need to check if the lookup is on virtual dir */     \
+                if ((loc->name && !strcmp (GF_GFID_DIR, loc->name)) &&  \
+                    ((loc->parent &&                                    \
+                      __is_root_gfid (loc->parent->gfid)) ||            \
+                      __is_root_gfid (loc->pargfid))) {                 \
+                        err = EEXIST;                                   \
+                        goto lbl;                                       \
+                }                                                       \
+                                                                        \
+                /* now, check if the lookup() is on an existing */      \
+                /* entry, but on gfid-path */                           \
+                if ((loc->parent &&                                     \
+                     __is_gfid_access_dir (loc->parent->gfid)) ||       \
+                    __is_gfid_access_dir (loc->pargfid)) {              \
+                        err = EPERM;                                    \
+                        goto lbl;                                       \
+                }                                                       \
+        } while (0)
+
+
+typedef struct {
+        unsigned int  uid;
+        unsigned int  gid;
+        char          gfid[UUID_CANONICAL_FORM_LEN + 1];
+        unsigned int  st_mode;
+        char         *bname;
+
+        union {
+                struct _symlink_in {
+                        char     *linkpath;
+                } __attribute__ ((__packed__)) symlink;
+
+                struct _mknod_in {
+                        unsigned int mode;
+                        unsigned int rdev;
+                        unsigned int umask;
+                } __attribute__ ((__packed__)) mknod;
+
+                struct _mkdir_in {
+                        unsigned int mode;
+                        unsigned int umask;
+                } __attribute__ ((__packed__)) mkdir;
+        } __attribute__ ((__packed__)) args;
+} __attribute__((__packed__)) ga_newfile_args_t;
+
+typedef struct {
+        char      gfid[UUID_CANONICAL_FORM_LEN + 1];
+        char     *bname; /* a null terminated basename */
+} __attribute__((__packed__)) ga_heal_args_t;
+
+struct ga_private {
+        /* root inode's stbuf */
+        struct iatt root_stbuf;
+        struct iatt gfiddir_stbuf;
+        struct mem_pool *newfile_args_pool;
+        struct mem_pool *heal_args_pool;
+};
+typedef struct ga_private ga_private_t;
+
+#endif /* __GFID_ACCESS_H__ */
diff --git a/xlators/features/glupy/Makefile.am b/xlators/features/glupy/Makefile.am
new file mode 100644
index 000000000..a985f42a8
--- /dev/null
+++ b/xlators/features/glupy/Makefile.am
@@ -0,0 +1,3 @@
+SUBDIRS = src
+
+CLEANFILES =
diff --git a/xlators/features/glupy/doc/README.md b/xlators/features/glupy/doc/README.md
new file mode 100644
index 000000000..2d7b30ef6
--- /dev/null
+++ b/xlators/features/glupy/doc/README.md
@@ -0,0 +1,44 @@
+This is just the very start for a GlusterFS[1] meta-translator that will
+allow translator code to be written in Python.  It's based on the standard
+Python embedding (not extending) techniques, plus a dash of the ctypes module.
+The interface is a pretty minimal adaptation of the dispatches and callbacks
+from the C API[2] to Python, as follows:
+
+* Dispatch functions and callbacks must be defined on an "xlator" class
+  derived from gluster.Translator so that they'll be auto-registered with
+  the C translator during initialization.
+
+* For each dispatch or callback function you want to intercept, you define a
+  Python function using the xxx\_fop\_t or xxx\_cbk\_t decorator.
+
+* The arguments for each operation are different, so you'll need to refer to
+  the C API.  GlusterFS-specific types are used (though only loc\_t is fully
+  defined so far) and type correctness is enforced by ctypes.
+
+* If you do intercept a dispatch function, it is your responsibility to call
+  xxx\_wind (like STACK\_WIND in the C API but operation-specific) to pass
+  the request to the next translator.  If you do not intercept a function, it
+  will default the same way as for C (pass through to the same operation with
+  the same arguments on the first child translator).
+
+* If you intercept a callback function, it is your responsibility to call
+  xxx\_unwind (like STACK\_UNWIND\_STRICT in the C API) to pass the request back
+  to the caller.
+
+So far only the lookup and create operations are handled this way, to support
+the "negative lookup" example.  Now that the basic infrastructure is in place,
+adding more functions should be very quick, though with that much boilerplate I
+might pause to write a code generator.  I also plan to add structure
+definitions and interfaces for some of the utility functions in libglusterfs
+(especially those having to do with inode and fd context) in the fairly near
+future.  Note that you can also use ctypes to get at anything not explicitly
+exposed to Python already.
+
+_If you're coming here because of the Linux Journal article, please note that
+the code has evolved since that was written. The version that matches the
+article is here:_
+
+https://github.com/jdarcy/glupy/tree/4bbae91ba459ea46ef32f2966562492e4ca9187a
+
+[1] http://www.gluster.org
+[2] http://hekafs.org/dist/xlator_api_2.html
diff --git a/xlators/features/glupy/doc/TESTING b/xlators/features/glupy/doc/TESTING
new file mode 100644
index 000000000..e05f17f49
--- /dev/null
+++ b/xlators/features/glupy/doc/TESTING
@@ -0,0 +1,9 @@
+Loading a translator written in Python using the glupy meta translator
+-------------------------------------------------------------------------------
+'test.vol' is a simple volfile with the debug-trace Python translator on top
+of a brick. The volfile can be mounted using the following command.
+
+$ glusterfs --debug -f test.vol /path/to/mntpt
+
+If then file operations are performed on the newly mounted file system, log
+output would be printed by the Python translator on the standard output.
diff --git a/xlators/features/glupy/doc/test.vol b/xlators/features/glupy/doc/test.vol
new file mode 100644
index 000000000..0751a488c
--- /dev/null
+++ b/xlators/features/glupy/doc/test.vol
@@ -0,0 +1,10 @@
+volume vol-posix
+    type storage/posix
+    option directory /path/to/brick
+end-volume
+
+volume vol-glupy
+    type features/glupy
+    option module-name debug-trace
+    subvolumes vol-posix
+end-volume
diff --git a/xlators/features/glupy/src/Makefile.am b/xlators/features/glupy/src/Makefile.am
new file mode 100644
index 000000000..960862839
--- /dev/null
+++ b/xlators/features/glupy/src/Makefile.am
@@ -0,0 +1,20 @@
+xlator_LTLIBRARIES = glupy.la
+
+xlatordir = $(libdir)/glusterfs/$(PACKAGE_VERSION)/xlator/features
+
+glupydir = $(xlatordir)/glupy
+
+glupy_PYTHON = gluster.py negative.py helloworld.py debug-trace.py
+
+glupy_la_LDFLAGS = -module -avoid-version -shared -nostartfiles
+glupy_la_SOURCES = glupy.c
+glupy_la_LIBADD = $(top_builddir)/libglusterfs/src/libglusterfs.la \
+	 -lpthread -l$(BUILD_PYTHON_LIB)
+
+noinst_HEADERS = glupy.h
+
+AM_CPPFLAGS = $(GF_CPPFLAGS) -I$(top_srcdir)/libglusterfs/src -isystem $(BUILD_PYTHON_INC)
+
+AM_CFLAGS = -Wall -fno-strict-aliasing -DGLUSTER_PYTHON_PATH=\"$(glupydir)\" $(GF_CFLAGS)
+
+CLEANFILES =
diff --git a/xlators/features/glupy/src/debug-trace.py b/xlators/features/glupy/src/debug-trace.py
new file mode 100644
index 000000000..53e76546b
--- /dev/null
+++ b/xlators/features/glupy/src/debug-trace.py
@@ -0,0 +1,774 @@
+import sys
+import stat
+from uuid import UUID
+from time import strftime, localtime
+from gluster import *
+# This translator was written primarily to test the fop entry point definitions
+# and structure definitions in 'gluster.py'.
+# It is similar to the debug-trace translator, one of the already available
+# translator types written in C, that logs the arguments passed to the fops and
+# their corresponding cbk functions.
+
+dl.get_id.restype = c_long
+dl.get_id.argtypes = [ POINTER(call_frame_t) ]
+
+dl.get_rootunique.restype = c_uint64
+dl.get_rootunique.argtypes = [ POINTER(call_frame_t) ]
+
+def uuid2str (gfid):
+        return str(UUID(''.join(map("{0:02x}".format, gfid))))
+
+
+def st_mode_from_ia (prot, filetype):
+        st_mode = 0
+        type_bit = 0
+        prot_bit = 0
+
+        if filetype == IA_IFREG:
+                type_bit = stat.S_IFREG
+        elif filetype == IA_IFDIR:
+                type_bit = stat.S_IFDIR
+        elif filetype == IA_IFLNK:
+                type_bit = stat.S_IFLNK
+        elif filetype == IA_IFBLK:
+                type_bit = stat.S_IFBLK
+        elif filetype == IA_IFCHR:
+                type_bit = stat.S_IFCHR
+        elif filetype == IA_IFIFO:
+                type_bit = stat.S_IFIFO
+        elif filetype == IA_IFSOCK:
+                type_bit = stat.S_IFSOCK
+        elif filetype == IA_INVAL:
+                pass
+
+
+        if prot.suid:
+                prot_bit |= stat.S_ISUID
+        if prot.sgid:
+                prot_bit |= stat.S_ISGID
+        if prot.sticky:
+                prot_bit |= stat.S_ISVTX
+
+        if prot.owner.read:
+                prot_bit |= stat.S_IRUSR
+        if prot.owner.write:
+                prot_bit |= stat.S_IWUSR
+        if prot.owner.execn:
+                prot_bit |= stat.S_IXUSR
+
+        if prot.group.read:
+                prot_bit |= stat.S_IRGRP
+        if prot.group.write:
+                prot_bit |= stat.S_IWGRP
+        if prot.group.execn:
+                prot_bit |= stat.S_IXGRP
+
+        if prot.other.read:
+                prot_bit |= stat.S_IROTH
+        if prot.other.write:
+                prot_bit |= stat.S_IWOTH
+        if prot.other.execn:
+                prot_bit |= stat.S_IXOTH
+
+        st_mode = (type_bit | prot_bit)
+
+        return st_mode
+
+
+def trace_stat2str (buf):
+        gfid = uuid2str(buf.contents.ia_gfid)
+        mode = st_mode_from_ia(buf.contents.ia_prot, buf.contents.ia_type)
+        atime_buf = strftime("[%b %d %H:%M:%S]",
+                             localtime(buf.contents.ia_atime))
+        mtime_buf = strftime("[%b %d %H:%M:%S]",
+                             localtime(buf.contents.ia_mtime))
+        ctime_buf = strftime("[%b %d %H:%M:%S]",
+                             localtime(buf.contents.ia_ctime))
+        return ("(gfid={0:s}, ino={1:d}, mode={2:o}, nlink={3:d}, uid ={4:d}, "+
+                "gid ={5:d}, size={6:d}, blocks={7:d}, atime={8:s}, mtime={9:s}, "+
+                "ctime={10:s})").format(gfid, buf.contents.ia_no, mode,
+                                        buf.contents.ia_nlink,
+                                        buf.contents.ia_uid,
+                                        buf.contents.ia_gid,
+                                        buf.contents.ia_size,
+                                        buf.contents.ia_blocks,
+                                        atime_buf, mtime_buf,
+                                        ctime_buf)
+
+class xlator(Translator):
+
+        def __init__(self, c_this):
+                Translator.__init__(self, c_this)
+                self.gfids = {}
+
+        def lookup_fop(self, frame, this, loc, xdata):
+                unique = dl.get_rootunique(frame)
+                key = dl.get_id(frame)
+                gfid = uuid2str(loc.contents.gfid)
+                print("GLUPY TRACE LOOKUP FOP- {0:d}: gfid={1:s}; " +
+                      "path={2:s}").format(unique, gfid, loc.contents.path)
+                self.gfids[key] = gfid
+                dl.wind_lookup(frame, POINTER(xlator_t)(), loc, xdata)
+                return 0
+
+        def lookup_cbk(self, frame, cookie, this, op_ret, op_errno,
+                       inode, buf, xdata, postparent):
+                unique =dl.get_rootunique(frame)
+                key =dl.get_id(frame)
+                if op_ret == 0:
+                        gfid = uuid2str(buf.contents.ia_gfid)
+                        statstr = trace_stat2str(buf)
+                        postparentstr = trace_stat2str(postparent)
+                        print("GLUPY TRACE LOOKUP CBK- {0:d}: gfid={1:s}; "+
+                              "op_ret={2:d}; *buf={3:s}; " +
+                              "*postparent={4:s}").format(unique, gfid,
+                                                          op_ret, statstr,
+                                                          postparentstr)
+                else:
+                        gfid = self.gfids[key]
+                        print("GLUPY TRACE LOOKUP CBK - {0:d}: gfid={1:s};" +
+                              " op_ret={2:d}; op_errno={3:d}").format(unique,
+                                                                      gfid,
+                                                                      op_ret,
+                                                                      op_errno)
+                del self.gfids[key]
+                dl.unwind_lookup(frame, cookie, this, op_ret, op_errno,
+                                 inode, buf, xdata, postparent)
+                return 0
+
+        def create_fop(self, frame, this, loc, flags, mode, umask, fd,
+                       xdata):
+                unique = dl.get_rootunique(frame)
+                gfid = uuid2str(loc.contents.gfid)
+                print("GLUPY TRACE CREATE FOP- {0:d}: gfid={1:s}; path={2:s}; " +
+                      "fd={3:s}; flags=0{4:o}; mode=0{5:o}; " +
+                      "umask=0{6:o}").format(unique, gfid, loc.contents.path,
+                                             fd, flags, mode, umask)
+                dl.wind_create(frame, POINTER(xlator_t)(), loc, flags,mode,
+                               umask, fd, xdata)
+                return 0
+
+        def create_cbk(self, frame, cookie, this, op_ret, op_errno, fd,
+                       inode, buf, preparent, postparent, xdata):
+                unique = dl.get_rootunique(frame)
+                if op_ret >= 0:
+                        gfid = uuid2str(inode.contents.gfid)
+                        statstr = trace_stat2str(buf)
+                        preparentstr = trace_stat2str(preparent)
+                        postparentstr = trace_stat2str(postparent)
+                        print("GLUPY TRACE CREATE CBK- {0:d}: gfid={1:s};" +
+                              " op_ret={2:d}; fd={3:s}; *stbuf={4:s}; " +
+                              "*preparent={5:s};" +
+                              " *postparent={6:s}").format(unique, gfid, op_ret,
+                                                           fd, statstr,
+                                                           preparentstr,
+                                                           postparentstr)
+                else:
+                        print ("GLUPY TRACE CREATE CBK- {0:d}: op_ret={1:d}; " +
+                              "op_errno={2:d}").format(unique, op_ret, op_errno)
+                dl.unwind_create(frame, cookie, this, op_ret, op_errno, fd,
+                                 inode, buf, preparent, postparent, xdata)
+                return 0
+
+        def open_fop(self, frame, this, loc, flags, fd, xdata):
+                unique = dl.get_rootunique(frame)
+                key = dl.get_id(frame)
+                gfid = uuid2str(loc.contents.inode.contents.gfid)
+                print("GLUPY TRACE OPEN FOP- {0:d}: gfid={1:s}; path={2:s}; "+
+                      "flags={3:d}; fd={4:s}").format(unique, gfid,
+                                                      loc.contents.path, flags,
+                                                      fd)
+                self.gfids[key] = gfid
+                dl.wind_open(frame, POINTER(xlator_t)(), loc, flags, fd, xdata)
+                return 0
+
+        def open_cbk(self, frame, cookie, this, op_ret, op_errno, fd, xdata):
+                unique = dl.get_rootunique(frame)
+                key = dl.get_id(frame)
+                gfid = self.gfids[key]
+                print("GLUPY TRACE OPEN CBK- {0:d}: gfid={1:s}; op_ret={2:d}; "
+                      "op_errno={3:d}; *fd={4:s}").format(unique, gfid,
+                                                          op_ret, op_errno, fd)
+                del self.gfids[key]
+                dl.unwind_open(frame, cookie, this, op_ret, op_errno, fd,
+                               xdata)
+                return 0
+
+        def readv_fop(self, frame, this, fd, size, offset, flags, xdata):
+                unique = dl.get_rootunique(frame)
+                key = dl.get_id(frame)
+                gfid = uuid2str(fd.contents.inode.contents.gfid)
+                print("GLUPY TRACE READV FOP- {0:d}: gfid={1:s}; "+
+                      "fd={2:s}; size ={3:d}; offset={4:d}; " +
+                      "flags=0{5:x}").format(unique, gfid, fd, size, offset,
+                                             flags)
+                self.gfids[key] = gfid
+                dl.wind_readv (frame, POINTER(xlator_t)(), fd, size, offset,
+                               flags, xdata)
+                return 0
+
+        def readv_cbk(self, frame, cookie, this, op_ret, op_errno, vector,
+                      count, buf, iobref, xdata):
+                unique = dl.get_rootunique(frame)
+                key = dl.get_id(frame)
+                gfid = self.gfids[key]
+                if op_ret >= 0:
+                        statstr = trace_stat2str(buf)
+                        print("GLUPY TRACE READV CBK- {0:d}: gfid={1:s}, "+
+                              "op_ret={2:d}; *buf={3:s};").format(unique, gfid,
+                                                                  op_ret,
+                                                                  statstr)
+
+                else:
+                        print("GLUPY TRACE READV CBK- {0:d}: gfid={1:s}, "+
+                              "op_ret={2:d}; op_errno={3:d}").format(unique,
+                                                                     gfid,
+                                                                     op_ret,
+                                                                     op_errno)
+                del self.gfids[key]
+                dl.unwind_readv (frame, cookie, this, op_ret, op_errno,
+                                 vector, count, buf, iobref, xdata)
+                return 0
+
+        def writev_fop(self, frame, this, fd, vector, count, offset, flags,
+                       iobref, xdata):
+                unique = dl.get_rootunique(frame)
+                key = dl.get_id(frame)
+                gfid = uuid2str(fd.contents.inode.contents.gfid)
+                print("GLUPY TRACE  WRITEV FOP- {0:d}: gfid={1:s}; " +
+                      "fd={2:s}; count={3:d}; offset={4:d}; " +
+                      "flags=0{5:x}").format(unique, gfid, fd, count, offset,
+                                             flags)
+                self.gfids[key] = gfid
+                dl.wind_writev(frame, POINTER(xlator_t)(), fd, vector, count,
+                               offset, flags, iobref, xdata)
+                return 0
+
+        def writev_cbk(self, frame, cookie, this, op_ret, op_errno, prebuf,
+                       postbuf, xdata):
+                unique = dl.get_rootunique(frame)
+                key = dl.get_id(frame)
+                if op_ret >= 0:
+                        preopstr = trace_stat2str(prebuf)
+                        postopstr = trace_stat2str(postbuf)
+                        print("GLUPY TRACE WRITEV CBK- {0:d}: op_ret={1:d}; " +
+                              "*prebuf={2:s}; " +
+                              "*postbuf={3:s}").format(unique, op_ret, preopstr,
+                                                       postopstr)
+                else:
+                        gfid = self.gfids[key]
+                        print("GLUPY TRACE WRITEV CBK- {0:d}: gfid={1:s}; "+
+                              "op_ret={2:d}; op_errno={3:d}").format(unique,
+                                                                     gfid,
+                                                                     op_ret,
+                                                                     op_errno)
+                del self.gfids[key]
+                dl.unwind_writev (frame, cookie, this, op_ret, op_errno,
+                                  prebuf, postbuf, xdata)
+                return 0
+
+        def opendir_fop(self, frame, this, loc, fd, xdata):
+                unique = dl.get_rootunique(frame)
+                key = dl.get_id(frame)
+                gfid = uuid2str(loc.contents.inode.contents.gfid)
+                print("GLUPY TRACE OPENDIR FOP- {0:d}: gfid={1:s}; path={2:s}; "+
+                      "fd={3:s}").format(unique, gfid, loc.contents.path, fd)
+                self.gfids[key] = gfid
+                dl.wind_opendir(frame, POINTER(xlator_t)(), loc, fd, xdata)
+                return 0
+
+        def opendir_cbk(self, frame, cookie, this, op_ret, op_errno, fd,
+                        xdata):
+                unique = dl.get_rootunique(frame)
+                key = dl.get_id(frame)
+                gfid = self.gfids[key]
+                print("GLUPY TRACE OPENDIR CBK- {0:d}: gfid={1:s}; op_ret={2:d};"+
+                      " op_errno={3:d}; fd={4:s}").format(unique, gfid, op_ret,
+                                                          op_errno, fd)
+                del self.gfids[key]
+                dl.unwind_opendir(frame, cookie, this, op_ret, op_errno,
+                                  fd, xdata)
+                return 0
+
+        def readdir_fop(self, frame, this, fd, size, offset, xdata):
+                unique = dl.get_rootunique(frame)
+                key = dl.get_id(frame)
+                gfid = uuid2str(fd.contents.inode.contents.gfid)
+                print("GLUPY TRACE READDIR FOP- {0:d}:  gfid={1:s}; fd={2:s}; " +
+                      "size={3:d}; offset={4:d}").format(unique, gfid, fd, size,
+                                                         offset)
+                self.gfids[key] = gfid
+                dl.wind_readdir(frame, POINTER(xlator_t)(), fd, size, offset,
+                                xdata)
+                return 0
+
+        def readdir_cbk(self, frame, cookie, this, op_ret, op_errno, buf,
+                        xdata):
+                unique = dl.get_rootunique(frame)
+                key = dl.get_id(frame)
+                gfid = self.gfids[key]
+                print("GLUPY TRACE READDIR CBK- {0:d}: gfid={1:s}; op_ret={2:d};"+
+                      " op_errno={3:d}").format(unique, gfid, op_ret, op_errno)
+                del self.gfids[key]
+                dl.unwind_readdir(frame, cookie, this, op_ret, op_errno, buf,
+                                  xdata)
+                return 0
+
+        def readdirp_fop(self, frame, this, fd, size, offset, dictionary):
+                unique = dl.get_rootunique(frame)
+                key = dl.get_id(frame)
+                gfid = uuid2str(fd.contents.inode.contents.gfid)
+                print("GLUPY TRACE READDIRP FOP- {0:d}: gfid={1:s}; fd={2:s}; "+
+                      " size={3:d}; offset={4:d}").format(unique, gfid, fd, size,
+                                                          offset)
+                self.gfids[key] = gfid
+                dl.wind_readdirp(frame, POINTER(xlator_t)(), fd, size, offset,
+                                 dictionary)
+                return 0
+
+        def readdirp_cbk(self, frame, cookie, this, op_ret, op_errno, buf,
+                         xdata):
+                unique = dl.get_rootunique(frame)
+                key = dl.get_id(frame)
+                gfid = self.gfids[key]
+                print("GLUPY TRACE READDIRP CBK- {0:d}: gfid={1:s}; "+
+                      "op_ret={2:d}; op_errno={3:d}").format(unique, gfid,
+                                                             op_ret, op_errno)
+                del self.gfids[key]
+                dl.unwind_readdirp(frame, cookie, this, op_ret, op_errno, buf,
+                                  xdata)
+                return 0
+
+        def mkdir_fop(self, frame, this, loc, mode, umask, xdata):
+                unique = dl.get_rootunique(frame)
+                gfid = uuid2str(loc.contents.inode.contents.gfid)
+                print("GLUPY TRACE MKDIR FOP- {0:d}: gfid={1:s}; path={2:s}; " +
+                      "mode={3:d}; umask=0{4:o}").format(unique, gfid,
+                                                         loc.contents.path, mode,
+                                                         umask)
+                dl.wind_mkdir(frame, POINTER(xlator_t)(), loc, mode, umask,
+                              xdata)
+                return 0
+
+        def mkdir_cbk(self, frame, cookie, this, op_ret, op_errno, inode, buf,
+                      preparent, postparent,  xdata):
+                unique = dl.get_rootunique(frame)
+                if op_ret == 0:
+                        gfid = uuid2str(inode.contents.gfid)
+                        statstr = trace_stat2str(buf)
+                        preparentstr = trace_stat2str(preparent)
+                        postparentstr = trace_stat2str(postparent)
+                        print("GLUPY TRACE MKDIR CBK- {0:d}: gfid={1:s}; "+
+                              "op_ret={2:d}; *stbuf={3:s}; *prebuf={4:s}; "+
+                              "*postbuf={5:s} ").format(unique, gfid, op_ret,
+                                                        statstr,
+                                                        preparentstr,
+                                                        postparentstr)
+                else:
+                        print("GLUPY TRACE MKDIR CBK- {0:d}:  op_ret={1:d}; "+
+                              "op_errno={2:d}").format(unique, op_ret, op_errno)
+                dl.unwind_mkdir(frame, cookie, this, op_ret, op_errno, inode,
+                                buf, preparent, postparent, xdata)
+                return 0
+
+        def rmdir_fop(self, frame, this, loc, flags, xdata):
+                unique = dl.get_rootunique(frame)
+                key = dl.get_id(frame)
+                gfid = uuid2str(loc.contents.inode.contents.gfid)
+                print("GLUPY TRACE RMDIR FOP- {0:d}: gfid={1:s}; path={2:s}; "+
+                      "flags={3:d}").format(unique, gfid, loc.contents.path,
+                                            flags)
+                self.gfids[key] = gfid
+                dl.wind_rmdir(frame, POINTER(xlator_t)(), loc, flags, xdata)
+                return 0
+
+        def rmdir_cbk(self, frame, cookie, this, op_ret, op_errno, preparent,
+                      postparent, xdata):
+                unique = dl.get_rootunique(frame)
+                key = dl.get_id(frame)
+                gfid = self.gfids[key]
+                if op_ret == 0:
+                        preparentstr = trace_stat2str(preparent)
+                        postparentstr = trace_stat2str(postparent)
+                        print("GLUPY TRACE RMDIR CBK- {0:d}: gfid={1:s}; "+
+                              "op_ret={2:d}; *prebuf={3:s}; "+
+                              "*postbuf={4:s}").format(unique, gfid, op_ret,
+                                                       preparentstr,
+                                                       postparentstr)
+                else:
+                        print("GLUPY TRACE RMDIR CBK- {0:d}: gfid={1:s}; "+
+                              "op_ret={2:d}; op_errno={3:d}").format(unique,
+                                                                     gfid,
+                                                                     op_ret,
+                                                                     op_errno)
+                del self.gfids[key]
+                dl.unwind_rmdir(frame, cookie, this, op_ret, op_errno,
+                                preparent, postparent, xdata)
+                return 0
+
+        def stat_fop(self, frame, this, loc, xdata):
+                unique = dl.get_rootunique(frame)
+                key = dl.get_id(frame)
+                gfid = uuid2str(loc.contents.inode.contents.gfid)
+                print("GLUPY TRACE STAT FOP- {0:d}: gfid={1:s}; " +
+                      " path={2:s}").format(unique, gfid, loc.contents.path)
+                self.gfids[key] = gfid
+                dl.wind_stat(frame, POINTER(xlator_t)(), loc, xdata)
+                return 0
+
+        def stat_cbk(self, frame, cookie, this, op_ret, op_errno, buf,
+                     xdata):
+                unique = dl.get_rootunique(frame)
+                key = dl.get_id(frame)
+                gfid = self.gfids[key]
+                if op_ret == 0:
+                        statstr = trace_stat2str(buf)
+                        print("GLUPY TRACE STAT CBK- {0:d}: gfid={1:s}; "+
+                              "op_ret={2:d};  *buf={3:s};").format(unique,
+                                                                   gfid,
+                                                                   op_ret,
+                                                                   statstr)
+                else:
+                        print("GLUPY TRACE STAT CBK- {0:d}: gfid={1:s}; "+
+                              "op_ret={2:d}; op_errno={3:d}").format(unique,
+                                                                     gfid,
+                                                                     op_ret,
+                                                                     op_errno)
+                del self.gfids[key]
+                dl.unwind_stat(frame, cookie, this, op_ret, op_errno,
+                               buf, xdata)
+                return 0
+
+        def fstat_fop(self, frame, this, fd, xdata):
+                unique = dl.get_rootunique(frame)
+                key = dl.get_id(frame)
+                gfid = uuid2str(fd.contents.inode.contents.gfid)
+                print("GLUPY TRACE FSTAT FOP- {0:d}:  gfid={1:s}; " +
+                      "fd={2:s}").format(unique, gfid, fd)
+                self.gfids[key] = gfid
+                dl.wind_fstat(frame, POINTER(xlator_t)(), fd, xdata)
+                return 0
+
+        def fstat_cbk(self, frame, cookie, this, op_ret, op_errno, buf,
+                      xdata):
+                unique = dl.get_rootunique(frame)
+                key = dl.get_id(frame)
+                gfid = self.gfids[key]
+                if op_ret == 0:
+                        statstr = trace_stat2str(buf)
+                        print("GLUPY TRACE FSTAT CBK- {0:d}: gfid={1:s} "+
+                              " op_ret={2:d}; *buf={3:s}").format(unique,
+                                                                  gfid,
+                                                                  op_ret,
+                                                                  statstr)
+                else:
+                        print("GLUPY TRACE FSTAT CBK- {0:d}: gfid={1:s} "+
+                              "op_ret={2:d}; op_errno={3:d}").format(unique.
+                                                                     gfid,
+                                                                     op_ret,
+                                                                     op_errno)
+                del self.gfids[key]
+                dl.unwind_fstat(frame, cookie, this, op_ret, op_errno,
+                                buf, xdata)
+                return 0
+
+        def statfs_fop(self, frame, this, loc, xdata):
+                unique = dl.get_rootunique(frame)
+                if loc.contents.inode:
+                        gfid = uuid2str(loc.contents.inode.contents.gfid)
+                else:
+                        gfid = "0"
+                print("GLUPY TRACE STATFS FOP- {0:d}: gfid={1:s}; "+
+                      "path={2:s}").format(unique, gfid, loc.contents.path)
+                dl.wind_statfs(frame, POINTER(xlator_t)(), loc, xdata)
+                return 0
+
+        def statfs_cbk(self, frame, cookie, this, op_ret, op_errno, buf,
+                       xdata):
+                unique = dl.get_rootunique(frame)
+                if op_ret == 0:
+                        #TBD: print buf (pointer to an iovec type object)
+                        print("GLUPY TRACE STATFS CBK {0:d}: "+
+                              "op_ret={1:d}").format(unique, op_ret)
+                else:
+                        print("GLUPY TRACE STATFS CBK-  {0:d}"+
+                              "op_ret={1:d}; op_errno={2:d}").format(unique,
+                                                                     op_ret,
+                                                                     op_errno)
+                dl.unwind_statfs(frame, cookie, this, op_ret, op_errno,
+                                 buf, xdata)
+                return 0
+
+        def getxattr_fop(self, frame, this, loc, name, xdata):
+                unique = dl.get_rootunique(frame)
+                key = dl.get_id(frame)
+                gfid = uuid2str(loc.contents.inode.contents.gfid)
+                print("GLUPY TRACE GETXATTR FOP- {0:d}: gfid={1:s}; path={2:s};"+
+                      " name={3:s}").format(unique, gfid, loc.contents.path,
+                                            name)
+                self.gfids[key]=gfid
+                dl.wind_getxattr(frame, POINTER(xlator_t)(), loc, name, xdata)
+                return 0
+
+        def getxattr_cbk(self, frame, cookie, this, op_ret, op_errno,
+                         dictionary, xdata):
+                unique = dl.get_rootunique(frame)
+                key = dl.get_id(frame)
+                gfid = self.gfids[key]
+                print("GLUPY TRACE GETXATTR CBK- {0:d}: gfid={1:s}; "+
+                      "op_ret={2:d}; op_errno={3:d}; "+
+                      " dictionary={4:s}").format(unique, gfid, op_ret, op_errno,
+                                                  dictionary)
+                del self.gfids[key]
+                dl.unwind_getxattr(frame, cookie, this, op_ret, op_errno,
+                                   dictionary, xdata)
+                return 0
+
+        def fgetxattr_fop(self, frame, this, fd, name, xdata):
+                unique = dl.get_rootunique(frame)
+                key = dl.get_id(frame)
+                gfid = uuid2str(fd.contents.inode.contents.gfid)
+                print("GLUPY TRACE FGETXATTR FOP- {0:d}: gfid={1:s}; fd={2:s}; "+
+                      "name={3:s}").format(unique, gfid, fd, name)
+                self.gfids[key] = gfid
+                dl.wind_fgetxattr(frame, POINTER(xlator_t)(), fd, name, xdata)
+                return 0
+
+        def fgetxattr_cbk(self, frame, cookie, this, op_ret, op_errno,
+                          dictionary, xdata):
+                unique = dl.get_rootunique(frame)
+                key = dl.get_id(frame)
+                gfid = self.gfids[key]
+                print("GLUPY TRACE FGETXATTR CBK- {0:d}: gfid={1:s}; "+
+                      "op_ret={2:d}; op_errno={3:d};"+
+                      " dictionary={4:s}").format(unique, gfid, op_ret,
+                                                  op_errno, dictionary)
+                del self.gfids[key]
+                dl.unwind_fgetxattr(frame, cookie, this, op_ret, op_errno,
+                                    dictionary, xdata)
+                return 0
+
+        def setxattr_fop(self, frame, this, loc, dictionary, flags, xdata):
+                unique = dl.get_rootunique(frame)
+                key = dl.get_id(frame)
+                gfid = uuid2str(loc.contents.inode.contents.gfid)
+                print("GLUPY TRACE SETXATTR FOP- {0:d}:  gfid={1:s}; path={2:s};"+
+                      " flags={3:d}").format(unique, gfid, loc.contents.path,
+                                             flags)
+                self.gfids[key] = gfid
+                dl.wind_setxattr(frame, POINTER(xlator_t)(), loc, dictionary,
+                                 flags, xdata)
+                return 0
+
+        def setxattr_cbk(self, frame, cookie, this, op_ret, op_errno, xdata):
+                unique = dl.get_rootunique(frame)
+                key = dl.get_id(frame)
+                gfid = self.gfids[key]
+                print("GLUPY TRACE SETXATTR CBK- {0:d}: gfid={1:s}; "+
+                      "op_ret={2:d}; op_errno={3:d}").format(unique, gfid,
+                                                             op_ret, op_errno)
+                del self.gfids[key]
+                dl.unwind_setxattr(frame, cookie, this, op_ret, op_errno,
+                                   xdata)
+                return 0
+
+        def fsetxattr_fop(self, frame, this, fd, dictionary, flags, xdata):
+                unique = dl.get_rootunique(frame)
+                key = dl.get_id(frame)
+                gfid = uuid2str(fd.contents.inode.contents.gfid)
+                print("GLUPY TRACE FSETXATTR FOP- {0:d}: gfid={1:s}; fd={2:p}; "+
+                      "flags={3:d}").format(unique, gfid, fd, flags)
+                self.gfids[key] = gfid
+                dl.wind_fsetxattr(frame, POINTER(xlator_t)(), fd, dictionary,
+                                  flags, xdata)
+                return 0
+
+        def fsetxattr_cbk(self, frame, cookie, this, op_ret, op_errno, xdata):
+                unique = dl.get_rootunique(frame)
+                key = dl.get_id(frame)
+                gfid = self.gfids[key]
+                print("GLUPY TRACE FSETXATTR CBK- {0:d}: gfid={1:s};  "+
+                      "op_ret={2:d}; op_errno={3:d}").format(unique, gfid,
+                                                             op_ret, op_errno)
+                del self.gfids[key]
+                dl.unwind_fsetxattr(frame, cookie, this, op_ret, op_errno,
+                                   xdata)
+                return 0
+
+        def removexattr_fop(self, frame, this, loc, name, xdata):
+                unique = dl.get_rootunique(frame)
+                key = dl.get_id(frame)
+                gfid = uuid2str(loc.contents.inode.contents.gfid)
+                print("GLUPY TRACE REMOVEXATTR FOP- {0:d}:  gfid={1:s}; "+
+                      "path={2:s}; name={3:s}").format(unique, gfid,
+                                                       loc.contents.path,
+                                                       name)
+                self.gfids[key] = gfid
+                dl.wind_removexattr(frame, POINTER(xlator_t)(), loc, name,
+                                    xdata)
+                return 0
+
+        def removexattr_cbk(self, frame, cookie, this, op_ret, op_errno,
+                            xdata):
+                unique = dl.get_rootunique(frame)
+                key = dl.get_id(frame)
+                gfid = self.gfids[key]
+                print("GLUPY TRACE REMOVEXATTR CBK- {0:d}: gfid={1:s} "+
+                      " op_ret={2:d}; op_errno={3:d}").format(unique, gfid,
+                                                              op_ret, op_errno)
+                del self.gfids[key]
+                dl.unwind_removexattr(frame, cookie, this, op_ret, op_errno,
+                                      xdata)
+                return 0
+
+        def link_fop(self, frame, this, oldloc, newloc, xdata):
+                unique = dl.get_rootunique(frame)
+                key = dl.get_id(frame)
+                if (newloc.contents.inode):
+                        newgfid = uuid2str(newloc.contents.inode.contents.gfid)
+                else:
+                        newgfid = "0"
+                oldgfid = uuid2str(oldloc.contents.inode.contents.gfid)
+                print("GLUPY TRACE LINK FOP-{0:d}: oldgfid={1:s}; oldpath={2:s};"+
+                      "newgfid={3:s};"+
+                      "newpath={4:s}").format(unique, oldgfid,
+                                              oldloc.contents.path,
+                                              newgfid,
+                                              newloc.contents.path)
+                self.gfids[key] =  oldgfid
+                dl.wind_link(frame, POINTER(xlator_t)(), oldloc, newloc,
+                             xdata)
+                return 0
+
+        def link_cbk(self, frame, cookie, this, op_ret, op_errno, inode, buf,
+                     preparent, postparent, xdata):
+                unique = dl.get_rootunique(frame)
+                key = dl.get_id(frame)
+                gfid = self.gfids[key]
+                if op_ret == 0:
+                        statstr = trace_stat2str(buf)
+                        preparentstr = trace_stat2str(preparent)
+                        postparentstr = trace_stat2str(postparent)
+                        print("GLUPY TRACE LINK CBK- {0:d}: op_ret={1:d} "+
+                              "*stbuf={2:s}; *prebuf={3:s}; "+
+                              "*postbuf={4:s} ").format(unique, op_ret, statstr,
+                                                        preparentstr,
+                                                        postparentstr)
+                else:
+                        print("GLUPY TRACE LINK CBK- {0:d}: gfid={1:s}; "+
+                              "op_ret={2:d}; "+
+                              "op_errno={3:d}").format(unique, gfid,
+                                                       op_ret, op_errno)
+                del self.gfids[key]
+                dl.unwind_link(frame, cookie, this, op_ret, op_errno, inode,
+                               buf, preparent, postparent, xdata)
+                return 0
+
+        def unlink_fop(self, frame, this, loc, xflag, xdata):
+                unique = dl.get_rootunique(frame)
+                key = dl.get_id(frame)
+                gfid = uuid2str(loc.contents.inode.contents.gfid)
+                print("GLUPY TRACE UNLINK FOP- {0:d}; gfid={1:s}; path={2:s}; "+
+                      "flag={3:d}").format(unique, gfid, loc.contents.path,
+                                           xflag)
+                self.gfids[key] = gfid
+                dl.wind_unlink(frame, POINTER(xlator_t)(), loc, xflag,
+                               xdata)
+                return 0
+
+        def unlink_cbk(self, frame, cookie, this, op_ret, op_errno,
+                       preparent, postparent, xdata):
+                unique = dl.get_rootunique(frame)
+                key = dl.get_id(frame)
+                gfid = self.gfids[key]
+                if op_ret == 0:
+                        preparentstr = trace_stat2str(preparent)
+                        postparentstr = trace_stat2str(postparent)
+                        print("GLUPY TRACE UNLINK CBK- {0:d}: gfid ={1:s}; "+
+                              "op_ret={2:d}; *prebuf={3:s}; "+
+                              "*postbuf={4:s} ").format(unique, gfid, op_ret,
+                                                        preparentstr,
+                                                        postparentstr)
+                else:
+                        print("GLUPY TRACE UNLINK CBK: {0:d}: gfid ={1:s}; "+
+                              "op_ret={2:d}; "+
+                              "op_errno={3:d}").format(unique, gfid, op_ret,
+                                                       op_errno)
+                del self.gfids[key]
+                dl.unwind_unlink(frame, cookie, this, op_ret, op_errno,
+                                 preparent, postparent, xdata)
+                return 0
+
+        def readlink_fop(self, frame, this, loc, size, xdata):
+                unique = dl.get_rootunique(frame)
+                key = dl.get_id(frame)
+                gfid = uuid2str(loc.contents.inode.contents.gfid)
+                print("GLUPY TRACE READLINK FOP- {0:d}:  gfid={1:s}; path={2:s};"+
+                      " size={3:d}").format(unique, gfid, loc.contents.path,
+                                            size)
+                self.gfids[key] = gfid
+                dl.wind_readlink(frame, POINTER(xlator_t)(), loc, size,
+                               xdata)
+                return 0
+
+        def readlink_cbk(self, frame, cookie, this, op_ret, op_errno,
+                         buf, stbuf, xdata):
+                unique = dl.get_rootunique(frame)
+                key = dl.get_id(frame)
+                gfid  = self.gfids[key]
+                if op_ret == 0:
+                        statstr = trace_stat2str(stbuf)
+                        print("GLUPY TRACE READLINK CBK- {0:d}: gfid={1:s} "+
+                              " op_ret={2:d}; op_errno={3:d}; *prebuf={4:s}; "+
+                              "*postbuf={5:s} ").format(unique, gfid,
+                                                        op_ret, op_errno,
+                                                        buf, statstr)
+                else:
+                        print("GLUPY TRACE READLINK CBK- {0:d}: gfid={1:s} "+
+                              " op_ret={2:d}; op_errno={3:d}").format(unique,
+                                                                      gfid,
+                                                                      op_ret,
+                                                                      op_errno)
+                del self.gfids[key]
+                dl.unwind_readlink(frame, cookie, this, op_ret, op_errno, buf,
+                                   stbuf, xdata)
+                return 0
+
+        def symlink_fop(self, frame, this, linkpath, loc, umask, xdata):
+                unique = dl.get_rootunique(frame)
+                key = dl.get_id(frame)
+                gfid = uuid2str(loc.contents.inode.contents.gfid)
+                print("GLUPY TRACE SYMLINK FOP- {0:d}: gfid={1:s}; "+
+                      "linkpath={2:s}; path={3:s};"+
+                      "umask=0{4:o}").format(unique, gfid, linkpath,
+                                             loc.contents.path, umask)
+                self.gfids[key] = gfid
+                dl.wind_symlink(frame, POINTER(xlator_t)(), linkpath, loc,
+                                umask, xdata)
+                return 0
+
+        def symlink_cbk(self, frame, cookie, this, op_ret, op_errno,
+                        inode, buf, preparent, postparent, xdata):
+                unique = dl.get_rootunique(frame)
+                key = dl.get_id(frame)
+                gfid = self.gfids[key]
+                if op_ret == 0:
+                        statstr = trace_stat2str(buf)
+                        preparentstr = trace_stat2str(preparent)
+                        postparentstr = trace_stat2str(postparent)
+                        print("GLUPY TRACE SYMLINK CBK- {0:d}: gfid={1:s}; "+
+                              "op_ret={2:d}; *stbuf={3:s}; *preparent={4:s}; "+
+                              "*postparent={5:s}").format(unique, gfid,
+                                                          op_ret, statstr,
+                                                          preparentstr,
+                                                          postparentstr)
+                else:
+                        print("GLUPY TRACE SYMLINK CBK- {0:d}: gfid={1:s}; "+
+                              "op_ret={2:d}; op_errno={3:d}").format(unique,
+                                                                     gfid,
+                                                                     op_ret,
+                                                                     op_errno)
+                del self.gfids[key]
+                dl.unwind_symlink(frame, cookie, this, op_ret, op_errno,
+                                  inode, buf, preparent, postparent, xdata)
+                return 0
diff --git a/xlators/features/glupy/src/glupy.c b/xlators/features/glupy/src/glupy.c
new file mode 100644
index 000000000..dc86c0071
--- /dev/null
+++ b/xlators/features/glupy/src/glupy.c
@@ -0,0 +1,2470 @@
+/*
+  Copyright (c) 2012 Red Hat, Inc. <http://www.redhat.com>
+  This file is part of GlusterFS.
+
+  GlusterFS is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published
+  by the Free Software Foundation; either version 3 of the License,
+  or (at your option) any later version.
+
+  GlusterFS is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see
+  <http://www.gnu.org/licenses/>.
+*/
+
+#include <ctype.h>
+#include <sys/uio.h>
+#include <Python.h>
+
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+
+#include "glusterfs.h"
+#include "xlator.h"
+#include "logging.h"
+#include "defaults.h"
+
+#include "glupy.h"
+
+/* UTILITY FUNCTIONS FOR FOP-SPECIFIC CODE */
+
+pthread_key_t gil_init_key;
+
+PyGILState_STATE
+glupy_enter (void)
+{
+#if 0
+        if (!pthread_getspecific(gil_init_key)) {
+                PyEval_ReleaseLock();
+                (void)pthread_setspecific(gil_init_key,(void *)1);
+        }
+#endif
+
+        return PyGILState_Ensure();
+}
+
+void
+glupy_leave (PyGILState_STATE gstate)
+{
+        PyGILState_Release(gstate);
+}
+
+/* FOP: LOOKUP */
+
+int32_t
+glupy_lookup_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                  int32_t op_ret, int32_t op_errno, inode_t *inode,
+                  struct iatt *buf, dict_t *xdata, struct iatt *postparent)
+{
+        glupy_private_t *priv = this->private;
+        PyGILState_STATE gstate;
+        int32_t ret;
+
+        if (!priv->cbks[GLUPY_LOOKUP]) {
+                goto unwind;
+        }
+
+        gstate = glupy_enter();
+        ret = ((fop_lookup_cbk_t)(priv->cbks[GLUPY_LOOKUP]))(
+                frame, cookie, this, op_ret, op_errno,
+                inode, buf, xdata, postparent);
+        glupy_leave(gstate);
+
+        return ret;
+
+unwind:
+        frame->local = NULL;
+        STACK_UNWIND_STRICT (lookup, frame, op_ret, op_errno, inode, buf,
+                             xdata, postparent);
+        return 0;
+}
+
+int32_t
+glupy_lookup (call_frame_t *frame, xlator_t *this, loc_t *loc,
+              dict_t *xdata)
+{
+        glupy_private_t *priv = this->private;
+        PyGILState_STATE gstate;
+        int32_t ret;
+        static long next_id = 0;
+
+        if (!priv->fops[GLUPY_LOOKUP]) {
+                goto wind;
+        }
+
+        gstate = glupy_enter();
+        frame->local = (void *)++next_id;
+        ret = ((fop_lookup_t)(priv->fops[GLUPY_LOOKUP]))(
+                frame, this, loc, xdata);
+        glupy_leave(gstate);
+
+        return ret;
+
+wind:
+        STACK_WIND (frame, glupy_lookup_cbk, FIRST_CHILD(this),
+                    FIRST_CHILD(this)->fops->lookup, loc, xdata);
+        return 0;
+}
+
+void
+wind_lookup (call_frame_t *frame, xlator_t *xl, loc_t *loc, dict_t *xdata)
+{
+        xlator_t        *this = THIS;
+
+        if (!xl || (xl == this)) {
+                xl = FIRST_CHILD(this);
+        }
+
+        STACK_WIND(frame,glupy_lookup_cbk,xl,xl->fops->lookup,loc,xdata);
+}
+
+void
+unwind_lookup (call_frame_t *frame, long cookie, xlator_t *this,
+               int32_t op_ret, int32_t op_errno, inode_t *inode,
+               struct iatt *buf, dict_t *xdata, struct iatt *postparent)
+{
+        frame->local = NULL;
+        STACK_UNWIND_STRICT(lookup,frame,op_ret,op_errno,
+                            inode,buf,xdata,postparent);
+}
+
+void
+set_lookup_fop (long py_this, fop_lookup_t fop)
+{
+        glupy_private_t *priv   = ((xlator_t *)py_this)->private;
+
+        priv->fops[GLUPY_LOOKUP] = (long)fop;
+}
+
+void
+set_lookup_cbk (long py_this, fop_lookup_cbk_t cbk)
+{
+        glupy_private_t *priv   = ((xlator_t *)py_this)->private;
+
+        priv->cbks[GLUPY_LOOKUP] = (long)cbk;
+}
+
+/* FOP: CREATE */
+
+int32_t
+glupy_create_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                  int32_t op_ret, int32_t op_errno, fd_t *fd, inode_t *inode,
+                  struct iatt *buf, struct iatt *preparent,
+                  struct iatt *postparent, dict_t *xdata)
+{
+        glupy_private_t *priv = this->private;
+        PyGILState_STATE gstate;
+        int32_t ret;
+
+        if (!priv->cbks[GLUPY_CREATE]) {
+                goto unwind;
+        }
+
+        gstate = glupy_enter();
+        ret = ((fop_create_cbk_t)(priv->cbks[GLUPY_CREATE]))(
+                frame, cookie, this, op_ret, op_errno,
+                fd, inode, buf, preparent, postparent, xdata);
+        glupy_leave(gstate);
+
+        return ret;
+
+unwind:
+        frame->local = NULL;
+        STACK_UNWIND_STRICT (create, frame, op_ret, op_errno, fd, inode, buf,
+                             preparent, postparent, xdata);
+        return 0;
+}
+
+int32_t
+glupy_create (call_frame_t *frame, xlator_t *this, loc_t *loc, int32_t flags,
+              mode_t mode, mode_t umask, fd_t *fd, dict_t *xdata)
+{
+        glupy_private_t *priv = this->private;
+        PyGILState_STATE gstate;
+        int32_t ret;
+        static long next_id = 0;
+
+        if (!priv->fops[GLUPY_CREATE]) {
+                goto wind;
+        }
+
+        gstate = glupy_enter();
+        frame->local = (void *)++next_id;
+        ret = ((fop_create_t)(priv->fops[GLUPY_CREATE]))(
+                frame, this, loc, flags, mode, umask, fd, xdata);
+        glupy_leave(gstate);
+
+        return ret;
+
+wind:
+        STACK_WIND (frame, glupy_create_cbk, FIRST_CHILD(this),
+                    FIRST_CHILD(this)->fops->create, loc, flags, mode, umask,
+                    fd, xdata);
+        return 0;
+}
+
+void
+wind_create (call_frame_t *frame, xlator_t *xl, loc_t *loc, int32_t flags,
+             mode_t mode, mode_t umask, fd_t *fd, dict_t *xdata)
+{
+        xlator_t        *this = THIS;
+
+        if (!xl || (xl == this)) {
+                xl = FIRST_CHILD(this);
+        }
+
+        STACK_WIND (frame, glupy_create_cbk,xl, xl->fops->create,
+                    loc, flags, mode, umask, fd, xdata);
+}
+
+void
+unwind_create (call_frame_t *frame, long cookie, xlator_t *this,
+               int32_t op_ret, int32_t op_errno, fd_t *fd, inode_t *inode,
+               struct iatt *buf, struct iatt *preparent,
+               struct iatt *postparent, dict_t *xdata)
+{
+        frame->local = NULL;
+        STACK_UNWIND_STRICT (create, frame, op_ret, op_errno, fd, inode, buf,
+                             preparent, postparent, xdata);
+}
+
+void
+set_create_fop (long py_this, fop_create_t fop)
+{
+        glupy_private_t *priv   = ((xlator_t *)py_this)->private;
+
+        priv->fops[GLUPY_CREATE] = (long)fop;
+}
+
+void
+set_create_cbk (long py_this, fop_create_cbk_t cbk)
+{
+        glupy_private_t *priv   = ((xlator_t *)py_this)->private;
+
+        priv->cbks[GLUPY_CREATE] = (long)cbk;
+}
+
+/* FOP: OPEN */
+
+int32_t
+glupy_open_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                int32_t op_ret, int32_t op_errno, fd_t *fd, dict_t *xdata)
+{
+        glupy_private_t *priv = this->private;
+        PyGILState_STATE gstate;
+        int32_t ret;
+
+        if (!priv->cbks[GLUPY_OPEN]) {
+                goto unwind;
+        }
+
+        gstate = glupy_enter();
+        ret = ((fop_open_cbk_t)(priv->cbks[GLUPY_OPEN]))(
+                frame, cookie, this, op_ret, op_errno,
+                fd, xdata);
+        glupy_leave(gstate);
+
+        return ret;
+
+unwind:
+        frame->local = NULL;
+        STACK_UNWIND_STRICT (open, frame, op_ret, op_errno, fd, xdata);
+        return 0;
+}
+
+int32_t
+glupy_open (call_frame_t *frame, xlator_t *this, loc_t *loc,
+            int32_t flags, fd_t *fd, dict_t *xdata)
+{
+        glupy_private_t *priv = this->private;
+        PyGILState_STATE gstate;
+        int32_t ret;
+        static long next_id = 0;
+
+        if (!priv->fops[GLUPY_OPEN]) {
+                goto wind;
+        }
+
+        gstate = glupy_enter();
+        frame->local = (void *)++next_id;
+        ret = ((fop_open_t)(priv->fops[GLUPY_OPEN]))(
+                frame, this, loc, flags, fd, xdata);
+        glupy_leave(gstate);
+
+        return ret;
+
+wind:
+        STACK_WIND (frame, glupy_open_cbk, FIRST_CHILD(this),
+                    FIRST_CHILD(this)->fops->open, loc, flags, fd, xdata);
+        return 0;
+}
+
+void
+wind_open (call_frame_t *frame, xlator_t *xl, loc_t *loc, int32_t flags,
+           fd_t *fd, dict_t *xdata)
+{
+        xlator_t        *this = THIS;
+
+        if (!xl || (xl == this)) {
+                xl = FIRST_CHILD(this);
+        }
+
+        STACK_WIND (frame, glupy_open_cbk, xl, xl->fops->open, loc, flags,
+                    fd, xdata);
+}
+
+void
+unwind_open (call_frame_t *frame, long cookie, xlator_t *this,
+             int32_t op_ret, int32_t op_errno, fd_t *fd, dict_t *xdata)
+{
+        frame->local = NULL;
+        STACK_UNWIND_STRICT (open, frame, op_ret, op_errno, fd, xdata);
+}
+
+void
+set_open_fop (long py_this, fop_open_t fop)
+{
+        glupy_private_t *priv   = ((xlator_t *)py_this)->private;
+        priv->fops[GLUPY_OPEN] = (long)fop;
+}
+
+void
+set_open_cbk (long py_this, fop_open_cbk_t cbk)
+{
+        glupy_private_t *priv   = ((xlator_t *)py_this)->private;
+        priv->cbks[GLUPY_OPEN] = (long)cbk;
+}
+
+/* FOP: READV */
+
+int32_t
+glupy_readv_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                 int32_t op_ret, int32_t op_errno, struct iovec *vector,
+                 int32_t count, struct iatt *stbuf, struct iobref *iobref,
+                 dict_t *xdata)
+{
+        glupy_private_t *priv = this->private;
+        PyGILState_STATE gstate;
+        int32_t ret;
+
+        if (!priv->cbks[GLUPY_READV]) {
+                goto unwind;
+        }
+
+        gstate = glupy_enter();
+        ret = ((fop_readv_cbk_t)(priv->cbks[GLUPY_READV]))(
+                frame, cookie, this, op_ret, op_errno,
+                vector, count, stbuf, iobref, xdata);
+        glupy_leave(gstate);
+
+        return ret;
+
+unwind:
+        frame->local = NULL;
+        STACK_UNWIND_STRICT (readv, frame, op_ret, op_errno, vector,
+                             count, stbuf, iobref, xdata);
+        return 0;
+}
+
+int32_t
+glupy_readv (call_frame_t *frame, xlator_t *this, fd_t *fd,
+             size_t size, off_t offset, uint32_t flags, dict_t *xdata)
+{
+        glupy_private_t *priv = this->private;
+        PyGILState_STATE gstate;
+        int32_t ret;
+        static long next_id = 0;
+
+        if (!priv->fops[GLUPY_READV]) {
+                goto wind;
+        }
+
+        gstate = glupy_enter();
+        frame->local = (void *)++next_id;
+        ret = ((fop_readv_t)(priv->fops[GLUPY_READV]))(
+                frame, this, fd, size, offset, flags, xdata);
+        glupy_leave(gstate);
+
+        return ret;
+
+wind:
+        STACK_WIND (frame, glupy_readv_cbk, FIRST_CHILD(this),
+                    FIRST_CHILD(this)->fops->readv, fd, size, offset,
+                    flags, xdata);
+        return 0;
+}
+
+void
+wind_readv (call_frame_t *frame, xlator_t *xl, fd_t *fd, size_t size,
+            off_t offset, uint32_t flags, dict_t *xdata)
+{
+        xlator_t        *this = THIS;
+
+        if (!xl || (xl == this)) {
+                xl = FIRST_CHILD(this);
+        }
+
+        STACK_WIND (frame, glupy_readv_cbk, xl, xl->fops->readv, fd, size,
+                    offset, flags, xdata);
+}
+
+void
+unwind_readv (call_frame_t *frame, long cookie, xlator_t *this,
+              int32_t op_ret, int32_t op_errno, struct iovec *vector,
+              int32_t count, struct iatt *stbuf, struct iobref *iobref,
+              dict_t *xdata)
+{
+        frame->local = NULL;
+        STACK_UNWIND_STRICT (readv, frame, op_ret, op_errno, vector,
+                             count, stbuf, iobref, xdata);
+}
+
+void
+set_readv_fop (long py_this, fop_readv_t fop)
+{
+        glupy_private_t *priv   = ((xlator_t *)py_this)->private;
+        priv->fops[GLUPY_READV] = (long)fop;
+}
+
+void
+set_readv_cbk (long py_this, fop_readv_cbk_t cbk)
+{
+        glupy_private_t *priv   = ((xlator_t *)py_this)->private;
+        priv->cbks[GLUPY_READV] = (long)cbk;
+}
+
+/* FOP: WRITEV */
+
+int32_t
+glupy_writev_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                  int32_t op_ret, int32_t op_errno, struct iatt *prebuf,
+                  struct iatt *postbuf, dict_t *xdata)
+{
+        glupy_private_t *priv = this->private;
+        PyGILState_STATE gstate;
+        int32_t ret;
+
+        if (!priv->cbks[GLUPY_WRITEV]) {
+                goto unwind;
+        }
+
+        gstate = glupy_enter();
+        ret = ((fop_writev_cbk_t)(priv->cbks[GLUPY_WRITEV]))(
+                frame, cookie, this, op_ret, op_errno,
+                prebuf, postbuf, xdata);
+        glupy_leave(gstate);
+
+        return ret;
+
+unwind:
+        frame->local = NULL;
+        STACK_UNWIND_STRICT (writev, frame, op_ret, op_errno, prebuf,
+                             postbuf, xdata);
+        return 0;
+}
+
+int32_t
+glupy_writev (call_frame_t *frame, xlator_t *this, fd_t *fd,
+              struct iovec *vector, int32_t count, off_t offset,
+              uint32_t flags, struct iobref *iobref, dict_t *xdata)
+{
+        glupy_private_t *priv = this->private;
+        PyGILState_STATE gstate;
+        int32_t ret;
+        static long next_id = 0;
+
+        if (!priv->fops[GLUPY_WRITEV]) {
+                goto wind;
+        }
+
+        gstate = glupy_enter();
+        frame->local = (void *)++next_id;
+        ret = ((fop_writev_t)(priv->fops[GLUPY_WRITEV]))(
+                frame, this, fd, vector, count, offset, flags,
+                iobref, xdata);
+        glupy_leave(gstate);
+
+        return ret;
+
+wind:
+        STACK_WIND (frame, glupy_writev_cbk, FIRST_CHILD(this),
+                    FIRST_CHILD(this)->fops->writev, fd, vector, count,
+                    offset, flags, iobref, xdata);
+        return 0;
+}
+
+void
+wind_writev (call_frame_t *frame, xlator_t *xl, fd_t *fd, struct iovec *vector,
+             int32_t count, off_t offset, uint32_t flags, struct iobref *iobref,
+             dict_t *xdata)
+{
+        xlator_t        *this = THIS;
+
+        if (!xl || (xl == this)) {
+                xl = FIRST_CHILD(this);
+        }
+
+        STACK_WIND (frame, glupy_writev_cbk, xl, xl->fops->writev, fd, vector,
+                    count, offset, flags, iobref, xdata);
+}
+
+void
+unwind_writev (call_frame_t *frame, long cookie, xlator_t *this,
+               int32_t op_ret, int32_t op_errno, struct iatt *prebuf,
+               struct iatt *postbuf, dict_t *xdata)
+{
+        frame->local = NULL;
+        STACK_UNWIND_STRICT (writev, frame, op_ret, op_errno, prebuf,
+                             postbuf, xdata);
+}
+
+void
+set_writev_fop (long py_this, fop_writev_t fop)
+{
+        glupy_private_t *priv   = ((xlator_t *)py_this)->private;
+        priv->fops[GLUPY_WRITEV] = (long)fop;
+}
+
+void
+set_writev_cbk (long py_this, fop_writev_cbk_t cbk)
+{
+        glupy_private_t *priv   = ((xlator_t *)py_this)->private;
+        priv->cbks[GLUPY_WRITEV] = (long)cbk;
+}
+
+
+/* FOP: OPENDIR */
+
+int32_t
+glupy_opendir_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                   int32_t op_ret, int32_t op_errno, fd_t *fd,
+                   dict_t *xdata)
+{
+        glupy_private_t *priv = this->private;
+        PyGILState_STATE gstate;
+        int32_t ret;
+
+        if (!priv->cbks[GLUPY_OPENDIR]) {
+                goto unwind;
+        }
+
+        gstate = glupy_enter();
+        ret = ((fop_opendir_cbk_t)(priv->cbks[GLUPY_OPENDIR]))(
+                frame, cookie, this, op_ret, op_errno,
+                fd, xdata);
+        glupy_leave(gstate);
+
+        return ret;
+
+unwind:
+        frame->local = NULL;
+        STACK_UNWIND_STRICT (opendir, frame, op_ret, op_errno, fd, xdata);
+        return 0;
+}
+
+int32_t
+glupy_opendir (call_frame_t *frame, xlator_t *this, loc_t *loc,
+               fd_t *fd, dict_t *xdata)
+{
+        glupy_private_t *priv = this->private;
+        PyGILState_STATE gstate;
+        int32_t ret;
+        static long next_id = 0;
+
+        if (!priv->fops[GLUPY_OPENDIR]) {
+                goto wind;
+        }
+
+        gstate = glupy_enter();
+        frame->local = (void *)++next_id;
+        ret = ((fop_opendir_t)(priv->fops[GLUPY_OPENDIR]))(
+                frame, this, loc, fd, xdata);
+        glupy_leave(gstate);
+
+        return ret;
+
+wind:
+        STACK_WIND (frame, glupy_opendir_cbk, FIRST_CHILD(this),
+                    FIRST_CHILD(this)->fops->opendir, loc, fd, xdata);
+        return 0;
+}
+
+void
+wind_opendir (call_frame_t *frame, xlator_t *xl, loc_t *loc, fd_t *fd, dict_t *xdata)
+{
+        xlator_t        *this = THIS;
+
+        if (!xl || (xl == this)) {
+                xl = FIRST_CHILD(this);
+        }
+
+        STACK_WIND(frame,glupy_opendir_cbk,xl,xl->fops->opendir,loc,fd,xdata);
+}
+
+void
+unwind_opendir (call_frame_t *frame, long cookie, xlator_t *this,
+                int32_t op_ret, int32_t op_errno, fd_t *fd, dict_t *xdata)
+{
+        frame->local = NULL;
+        STACK_UNWIND_STRICT(opendir,frame,op_ret,op_errno,
+                            fd,xdata);
+}
+
+void
+set_opendir_fop (long py_this, fop_opendir_t fop)
+{
+        glupy_private_t *priv   = ((xlator_t *)py_this)->private;
+
+        priv->fops[GLUPY_OPENDIR] = (long)fop;
+}
+
+void
+set_opendir_cbk (long py_this, fop_opendir_cbk_t cbk)
+{
+        glupy_private_t *priv   = ((xlator_t *)py_this)->private;
+
+        priv->cbks[GLUPY_OPENDIR] = (long)cbk;
+}
+
+/* FOP: READDIR */
+
+int32_t
+glupy_readdir_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                   int32_t op_ret, int32_t op_errno, gf_dirent_t *entries,
+                   dict_t *xdata)
+{
+        glupy_private_t *priv = this->private;
+        PyGILState_STATE gstate;
+        int32_t ret;
+
+        if (!priv->cbks[GLUPY_READDIR]) {
+                goto unwind;
+        }
+
+        gstate = glupy_enter();
+        ret = ((fop_readdir_cbk_t)(priv->cbks[GLUPY_READDIR]))(
+                frame, cookie, this, op_ret, op_errno,
+                entries,  xdata);
+        glupy_leave(gstate);
+
+        return ret;
+
+unwind:
+        frame->local = NULL;
+        STACK_UNWIND_STRICT (readdir, frame, op_ret, op_errno, entries,
+                             xdata);
+        return 0;
+}
+
+int32_t
+glupy_readdir (call_frame_t *frame, xlator_t *this, fd_t *fd,
+               size_t size, off_t offset, dict_t *xdata)
+{
+        glupy_private_t *priv = this->private;
+        PyGILState_STATE gstate;
+        int32_t ret;
+        static long next_id = 0;
+
+        if (!priv->fops[GLUPY_READDIR]) {
+                goto wind;
+        }
+
+        gstate = glupy_enter();
+        frame->local = (void *)++next_id;
+        ret = ((fop_readdir_t)(priv->fops[GLUPY_READDIR]))(
+                frame, this, fd, size, offset, xdata);
+        glupy_leave(gstate);
+
+        return ret;
+
+wind:
+        STACK_WIND (frame, glupy_readdir_cbk, FIRST_CHILD(this),
+                    FIRST_CHILD(this)->fops->readdir,fd, size, offset, xdata);
+        return 0;
+}
+
+void
+wind_readdir(call_frame_t *frame, xlator_t *xl, fd_t *fd, size_t size,
+             off_t offset, dict_t *xdata)
+{
+        xlator_t        *this = THIS;
+
+        if (!xl || (xl == this)) {
+                xl = FIRST_CHILD(this);
+        }
+
+        STACK_WIND(frame,glupy_readdir_cbk,xl,xl->fops->readdir,fd,size,offset,xdata);
+}
+
+void
+unwind_readdir (call_frame_t *frame, long cookie, xlator_t *this,
+                int32_t op_ret, int32_t op_errno, gf_dirent_t *entries,
+                dict_t *xdata)
+{
+        frame->local = NULL;
+        STACK_UNWIND_STRICT(readdir,frame,op_ret,op_errno,
+                            entries, xdata);
+}
+
+void
+set_readdir_fop (long py_this, fop_readdir_t fop)
+{
+        glupy_private_t *priv   = ((xlator_t *)py_this)->private;
+
+        priv->fops[GLUPY_READDIR] = (long)fop;
+}
+
+void
+set_readdir_cbk (long py_this, fop_readdir_cbk_t cbk)
+{
+        glupy_private_t *priv   = ((xlator_t *)py_this)->private;
+
+        priv->cbks[GLUPY_READDIR] = (long)cbk;
+}
+
+
+/* FOP: READDIRP */
+
+int32_t
+glupy_readdirp_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                    int32_t op_ret, int32_t op_errno, gf_dirent_t *entries,
+                    dict_t *xdata)
+{
+        glupy_private_t *priv = this->private;
+        PyGILState_STATE gstate;
+        int32_t ret;
+
+        if (!priv->cbks[GLUPY_READDIRP]) {
+                goto unwind;
+        }
+
+        gstate = glupy_enter();
+        ret = ((fop_readdirp_cbk_t)(priv->cbks[GLUPY_READDIRP]))(
+                frame, cookie, this, op_ret, op_errno,
+                entries,  xdata);
+        glupy_leave(gstate);
+
+        return ret;
+
+unwind:
+        frame->local = NULL;
+        STACK_UNWIND_STRICT (readdirp, frame, op_ret, op_errno, entries,
+                             xdata);
+        return 0;
+}
+
+int32_t
+glupy_readdirp (call_frame_t *frame, xlator_t *this, fd_t *fd,
+                size_t size, off_t offset, dict_t *xdata)
+{
+        glupy_private_t *priv = this->private;
+        PyGILState_STATE gstate;
+        int32_t ret;
+        static long next_id = 0;
+
+        if (!priv->fops[GLUPY_READDIRP]) {
+                goto wind;
+        }
+
+        gstate = glupy_enter();
+        frame->local = (void *)++next_id;
+        ret = ((fop_readdirp_t)(priv->fops[GLUPY_READDIRP]))(
+                frame, this, fd, size, offset, xdata);
+        glupy_leave(gstate);
+
+        return ret;
+
+wind:
+        STACK_WIND (frame, glupy_readdirp_cbk, FIRST_CHILD(this),
+                    FIRST_CHILD(this)->fops->readdirp,fd, size, offset, xdata);
+        return 0;
+}
+
+void
+wind_readdirp (call_frame_t *frame, xlator_t *xl, fd_t *fd, size_t size,
+               off_t offset, dict_t *xdata)
+{
+        xlator_t        *this = THIS;
+
+        if (!xl || (xl == this)) {
+                xl = FIRST_CHILD(this);
+        }
+
+        STACK_WIND(frame,glupy_readdirp_cbk,xl,xl->fops->readdirp,fd,size,offset,xdata);
+}
+
+void
+unwind_readdirp (call_frame_t *frame, long cookie, xlator_t *this,
+                 int32_t op_ret, int32_t op_errno, gf_dirent_t *entries,
+                 dict_t *xdata)
+{
+        frame->local = NULL;
+        STACK_UNWIND_STRICT(readdirp,frame,op_ret,op_errno,
+                            entries, xdata);
+}
+
+void
+set_readdirp_fop (long py_this, fop_readdirp_t fop)
+{
+        glupy_private_t *priv   = ((xlator_t *)py_this)->private;
+
+        priv->fops[GLUPY_READDIRP] = (long)fop;
+}
+
+void
+set_readdirp_cbk (long py_this, fop_readdirp_cbk_t cbk)
+{
+        glupy_private_t *priv   = ((xlator_t *)py_this)->private;
+
+        priv->cbks[GLUPY_READDIRP] = (long)cbk;
+}
+
+
+/* FOP:STAT */
+
+int32_t
+glupy_stat_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                int32_t op_ret, int32_t op_errno, struct iatt *buf, dict_t *xdata)
+{
+        glupy_private_t *priv = this->private;
+        PyGILState_STATE gstate;
+        int32_t ret;
+
+        if (!priv->cbks[GLUPY_STAT]) {
+                goto unwind;
+        }
+
+        gstate = glupy_enter();
+        ret = ((fop_stat_cbk_t)(priv->cbks[GLUPY_STAT]))(
+                frame, cookie, this, op_ret, op_errno,
+                buf, xdata);
+        glupy_leave(gstate);
+
+        return ret;
+
+unwind:
+        frame->local = NULL;
+        STACK_UNWIND_STRICT (stat, frame, op_ret, op_errno, buf, xdata);
+        return 0;
+}
+
+int32_t
+glupy_stat (call_frame_t *frame, xlator_t *this, loc_t *loc,
+            dict_t *xdata)
+{
+        glupy_private_t *priv = this->private;
+        PyGILState_STATE gstate;
+        int32_t ret;
+        static long next_id = 0;
+
+        if (!priv->fops[GLUPY_STAT]) {
+                goto wind;
+        }
+
+        gstate = glupy_enter();
+        frame->local = (void *)++next_id;
+        ret = ((fop_stat_t)(priv->fops[GLUPY_STAT]))(
+                frame, this, loc, xdata);
+        glupy_leave(gstate);
+
+        return ret;
+
+wind:
+        STACK_WIND (frame, glupy_stat_cbk, FIRST_CHILD(this),
+                    FIRST_CHILD(this)->fops->stat, loc, xdata);
+        return 0;
+}
+
+void
+wind_stat (call_frame_t *frame, xlator_t *xl, loc_t *loc, dict_t *xdata)
+{
+        xlator_t        *this = THIS;
+
+        if (!xl || (xl == this)) {
+                xl = FIRST_CHILD(this);
+        }
+
+        STACK_WIND(frame,glupy_stat_cbk,xl,xl->fops->stat,loc,xdata);
+}
+
+void
+unwind_stat (call_frame_t *frame, long cookie, xlator_t *this,
+             int32_t op_ret, int32_t op_errno, struct iatt *buf,
+             dict_t *xdata)
+{
+        frame->local = NULL;
+        STACK_UNWIND_STRICT(stat,frame,op_ret,op_errno,
+                            buf,xdata);
+}
+
+void
+set_stat_fop (long py_this, fop_stat_t fop)
+{
+        glupy_private_t *priv   = ((xlator_t *)py_this)->private;
+
+        priv->fops[GLUPY_STAT] = (long)fop;
+}
+
+void
+set_stat_cbk (long py_this, fop_stat_cbk_t cbk)
+{
+        glupy_private_t *priv   = ((xlator_t *)py_this)->private;
+
+        priv->cbks[GLUPY_STAT] = (long)cbk;
+}
+
+
+/* FOP: FSTAT */
+
+int32_t
+glupy_fstat_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                 int32_t op_ret, int32_t op_errno, struct iatt *buf, dict_t *xdata)
+{
+        glupy_private_t *priv = this->private;
+        PyGILState_STATE gstate;
+        int32_t ret;
+
+        if (!priv->cbks[GLUPY_FSTAT]) {
+                goto unwind;
+        }
+
+        gstate = glupy_enter();
+        ret = ((fop_fstat_cbk_t)(priv->cbks[GLUPY_FSTAT]))(
+                frame, cookie, this, op_ret, op_errno,
+                buf, xdata);
+        glupy_leave(gstate);
+
+        return ret;
+
+unwind:
+        frame->local = NULL;
+        STACK_UNWIND_STRICT (fstat, frame, op_ret, op_errno, buf, xdata);
+        return 0;
+}
+
+int32_t
+glupy_fstat (call_frame_t *frame, xlator_t *this, fd_t *fd,
+             dict_t *xdata)
+{
+        glupy_private_t *priv = this->private;
+        PyGILState_STATE gstate;
+        int32_t ret;
+        static long next_id = 0;
+
+        if (!priv->fops[GLUPY_FSTAT]) {
+                goto wind;
+        }
+
+        gstate = glupy_enter();
+        frame->local = (void *)++next_id;
+        ret = ((fop_fstat_t)(priv->fops[GLUPY_FSTAT]))(
+                frame, this, fd, xdata);
+        glupy_leave(gstate);
+
+        return ret;
+
+wind:
+        STACK_WIND (frame, glupy_fstat_cbk, FIRST_CHILD(this),
+                    FIRST_CHILD(this)->fops->fstat, fd, xdata);
+        return 0;
+}
+
+void
+wind_fstat (call_frame_t *frame, xlator_t *xl, fd_t *fd, dict_t *xdata)
+{
+        xlator_t        *this = THIS;
+
+        if (!xl || (xl == this)) {
+                xl = FIRST_CHILD(this);
+        }
+
+        STACK_WIND(frame,glupy_fstat_cbk,xl,xl->fops->fstat,fd,xdata);
+}
+
+void
+unwind_fstat (call_frame_t *frame, long cookie, xlator_t *this,
+              int32_t op_ret, int32_t op_errno, struct iatt *buf,
+              dict_t *xdata)
+{
+        frame->local = NULL;
+        STACK_UNWIND_STRICT(fstat,frame,op_ret,op_errno,
+                            buf,xdata);
+}
+
+void
+set_fstat_fop (long py_this, fop_fstat_t fop)
+{
+        glupy_private_t *priv   = ((xlator_t *)py_this)->private;
+
+        priv->fops[GLUPY_FSTAT] = (long)fop;
+}
+
+void
+set_fstat_cbk (long py_this, fop_fstat_cbk_t cbk)
+{
+        glupy_private_t *priv   = ((xlator_t *)py_this)->private;
+
+        priv->cbks[GLUPY_FSTAT] = (long)cbk;
+}
+
+/* FOP:STATFS */
+
+int32_t
+glupy_statfs_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                  int32_t op_ret, int32_t op_errno, struct statvfs *buf, dict_t *xdata)
+{
+        glupy_private_t *priv = this->private;
+        PyGILState_STATE gstate;
+        int32_t ret;
+
+        if (!priv->cbks[GLUPY_STATFS]) {
+                goto unwind;
+        }
+
+        gstate = glupy_enter();
+        ret = ((fop_statfs_cbk_t)(priv->cbks[GLUPY_STATFS]))(
+                frame, cookie, this, op_ret, op_errno,
+                buf, xdata);
+        glupy_leave(gstate);
+
+        return ret;
+
+unwind:
+        frame->local = NULL;
+        STACK_UNWIND_STRICT (statfs, frame, op_ret, op_errno, buf, xdata);
+        return 0;
+}
+
+int32_t
+glupy_statfs (call_frame_t *frame, xlator_t *this, loc_t *loc,
+              dict_t *xdata)
+{
+        glupy_private_t *priv = this->private;
+        PyGILState_STATE gstate;
+        int32_t ret;
+        static long next_id = 0;
+
+        if (!priv->fops[GLUPY_STATFS]) {
+                goto wind;
+        }
+
+        gstate = glupy_enter();
+        frame->local = (void *)++next_id;
+        ret = ((fop_statfs_t)(priv->fops[GLUPY_STATFS]))(
+                frame, this, loc, xdata);
+        glupy_leave(gstate);
+
+        return ret;
+
+wind:
+        STACK_WIND (frame, glupy_statfs_cbk, FIRST_CHILD(this),
+                    FIRST_CHILD(this)->fops->statfs, loc, xdata);
+        return 0;
+}
+
+void
+wind_statfs (call_frame_t *frame, xlator_t *xl, loc_t *loc, dict_t *xdata)
+{
+        xlator_t        *this = THIS;
+
+        if (!xl || (xl == this)) {
+                xl = FIRST_CHILD(this);
+        }
+
+        STACK_WIND(frame,glupy_statfs_cbk,xl,xl->fops->statfs,loc,xdata);
+}
+
+void
+unwind_statfs (call_frame_t *frame, long cookie, xlator_t *this,
+               int32_t op_ret, int32_t op_errno, struct statvfs *buf,
+               dict_t *xdata)
+{
+        frame->local = NULL;
+        STACK_UNWIND_STRICT(statfs,frame,op_ret,op_errno,
+                            buf,xdata);
+}
+
+void
+set_statfs_fop (long py_this, fop_statfs_t fop)
+{
+        glupy_private_t *priv   = ((xlator_t *)py_this)->private;
+
+        priv->fops[GLUPY_STATFS] = (long)fop;
+}
+
+void
+set_statfs_cbk (long py_this, fop_statfs_cbk_t cbk)
+{
+        glupy_private_t *priv   = ((xlator_t *)py_this)->private;
+
+        priv->cbks[GLUPY_STATFS] = (long)cbk;
+}
+
+
+/* FOP: SETXATTR */
+
+int32_t
+glupy_setxattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                    int32_t op_ret, int32_t op_errno, dict_t *xdata)
+{
+        glupy_private_t *priv = this->private;
+        PyGILState_STATE gstate;
+        int32_t ret;
+
+        if (!priv->cbks[GLUPY_SETXATTR]) {
+                goto unwind;
+        }
+
+        gstate = glupy_enter();
+        ret = ((fop_setxattr_cbk_t)(priv->cbks[GLUPY_SETXATTR]))(
+                frame, cookie, this, op_ret, op_errno,
+                xdata);
+        glupy_leave(gstate);
+
+        return ret;
+
+unwind:
+        frame->local = NULL;
+        STACK_UNWIND_STRICT (setxattr, frame, op_ret, op_errno, xdata);
+        return 0;
+}
+
+int32_t
+glupy_setxattr (call_frame_t *frame, xlator_t *this, loc_t *loc,
+                dict_t *dict, int32_t flags, dict_t *xdata)
+{
+        glupy_private_t *priv = this->private;
+        PyGILState_STATE gstate;
+        int32_t ret;
+        static long next_id = 0;
+
+        if (!priv->fops[GLUPY_SETXATTR]) {
+                goto wind;
+        }
+
+        gstate = glupy_enter();
+        frame->local = (void *)++next_id;
+        ret = ((fop_setxattr_t)(priv->fops[GLUPY_SETXATTR]))(
+                frame, this, loc, dict, flags, xdata);
+        glupy_leave(gstate);
+
+        return ret;
+
+wind:
+        STACK_WIND (frame, glupy_setxattr_cbk, FIRST_CHILD(this),
+                    FIRST_CHILD(this)->fops->setxattr, loc, dict,
+                    flags, xdata);
+        return 0;
+}
+
+void
+wind_setxattr (call_frame_t *frame, xlator_t *xl, loc_t *loc,
+               dict_t *dict, int32_t flags, dict_t *xdata)
+{
+        xlator_t        *this = THIS;
+
+        if (!xl || (xl == this)) {
+                xl = FIRST_CHILD(this);
+        }
+
+        STACK_WIND (frame, glupy_setxattr_cbk, xl, xl->fops->setxattr,
+                    loc, dict, flags, xdata);
+}
+
+
+void
+unwind_setxattr (call_frame_t *frame, long cookie, xlator_t *this,
+                 int32_t op_ret, int32_t op_errno, dict_t *xdata)
+{
+        frame->local = NULL;
+        STACK_UNWIND_STRICT (setxattr, frame, op_ret, op_errno, xdata);
+
+}
+
+void
+set_setxattr_fop (long py_this, fop_setxattr_t fop)
+{
+        glupy_private_t *priv   = ((xlator_t *)py_this)->private;
+
+        priv->fops[GLUPY_SETXATTR] = (long)fop;
+}
+
+void
+set_setxattr_cbk (long py_this, fop_setxattr_cbk_t cbk)
+{
+        glupy_private_t *priv   = ((xlator_t *)py_this)->private;
+
+        priv->cbks[GLUPY_SETXATTR] = (long)cbk;
+}
+
+/* FOP: GETXATTR */
+
+int32_t
+glupy_getxattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                    int32_t op_ret, int32_t op_errno, dict_t *dict,
+                    dict_t *xdata)
+{
+        glupy_private_t *priv = this->private;
+        PyGILState_STATE gstate;
+        int32_t ret;
+
+        if (!priv->cbks[GLUPY_GETXATTR]) {
+                goto unwind;
+        }
+
+        gstate = glupy_enter();
+        ret = ((fop_getxattr_cbk_t)(priv->cbks[GLUPY_GETXATTR]))(
+                frame, cookie, this, op_ret, op_errno, dict,
+                xdata);
+        glupy_leave(gstate);
+
+        return ret;
+
+unwind:
+        frame->local = NULL;
+        STACK_UNWIND_STRICT (getxattr, frame, op_ret, op_errno, dict,
+                             xdata);
+        return 0;
+}
+
+int32_t
+glupy_getxattr (call_frame_t *frame, xlator_t *this, loc_t *loc,
+                const char *name, dict_t *xdata)
+{
+        glupy_private_t *priv = this->private;
+        PyGILState_STATE gstate;
+        int32_t ret;
+        static long next_id = 0;
+
+        if (!priv->fops[GLUPY_GETXATTR]) {
+                goto wind;
+        }
+
+        gstate = glupy_enter();
+        frame->local = (void *)++next_id;
+        ret = ((fop_getxattr_t)(priv->fops[GLUPY_GETXATTR]))(
+                frame, this, loc, name, xdata);
+        glupy_leave(gstate);
+
+        return ret;
+
+wind:
+        STACK_WIND (frame, glupy_getxattr_cbk, FIRST_CHILD(this),
+                    FIRST_CHILD(this)->fops->getxattr, loc, name,
+                    xdata);
+        return 0;
+}
+
+void
+wind_getxattr (call_frame_t *frame, xlator_t *xl, loc_t *loc,
+               const char *name, dict_t *xdata)
+{
+        xlator_t        *this = THIS;
+
+        if (!xl || (xl == this)) {
+                xl = FIRST_CHILD(this);
+        }
+
+        STACK_WIND (frame, glupy_getxattr_cbk, xl, xl->fops->getxattr,
+                    loc, name, xdata);
+}
+
+
+void
+unwind_getxattr (call_frame_t *frame, long cookie, xlator_t *this,
+                 int32_t op_ret, int32_t op_errno, dict_t *dict,
+                 dict_t *xdata)
+{
+        frame->local = NULL;
+        STACK_UNWIND_STRICT (getxattr, frame, op_ret, op_errno, dict,
+                             xdata);
+
+}
+
+
+void
+set_getxattr_fop (long py_this, fop_getxattr_t fop)
+{
+        glupy_private_t *priv   = ((xlator_t *)py_this)->private;
+
+        priv->fops[GLUPY_GETXATTR] = (long)fop;
+}
+
+
+void
+set_getxattr_cbk (long py_this, fop_getxattr_cbk_t cbk)
+{
+        glupy_private_t *priv   = ((xlator_t *)py_this)->private;
+
+        priv->cbks[GLUPY_GETXATTR] = (long)cbk;
+}
+
+/* FOP: FSETXATTR */
+
+int32_t
+glupy_fsetxattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                     int32_t op_ret, int32_t op_errno, dict_t *xdata)
+{
+        glupy_private_t *priv = this->private;
+        PyGILState_STATE gstate;
+        int32_t ret;
+
+        if (!priv->cbks[GLUPY_FSETXATTR]) {
+                goto unwind;
+        }
+
+        gstate = glupy_enter();
+        ret = ((fop_fsetxattr_cbk_t)(priv->cbks[GLUPY_FSETXATTR]))(
+                frame, cookie, this, op_ret, op_errno,
+                xdata);
+        glupy_leave(gstate);
+
+        return ret;
+
+unwind:
+        frame->local = NULL;
+        STACK_UNWIND_STRICT (fsetxattr, frame, op_ret, op_errno, xdata);
+        return 0;
+}
+
+int32_t
+glupy_fsetxattr (call_frame_t *frame, xlator_t *this, fd_t *fd,
+                 dict_t *dict, int32_t flags, dict_t *xdata)
+{
+        glupy_private_t *priv = this->private;
+        PyGILState_STATE gstate;
+        int32_t ret;
+        static long next_id = 0;
+
+        if (!priv->fops[GLUPY_FSETXATTR]) {
+                goto wind;
+        }
+
+        gstate = glupy_enter();
+        frame->local = (void *)++next_id;
+        ret = ((fop_fsetxattr_t)(priv->fops[GLUPY_FSETXATTR]))(
+                frame, this, fd, dict, flags, xdata);
+        glupy_leave(gstate);
+
+        return ret;
+
+wind:
+        STACK_WIND (frame, glupy_fsetxattr_cbk, FIRST_CHILD(this),
+                    FIRST_CHILD(this)->fops->fsetxattr, fd, dict,
+                    flags, xdata);
+        return 0;
+}
+
+void
+wind_fsetxattr (call_frame_t *frame, xlator_t *xl, fd_t *fd,
+                dict_t *dict, int32_t flags, dict_t *xdata)
+{
+        xlator_t        *this = THIS;
+
+        if (!xl || (xl == this)) {
+                xl = FIRST_CHILD(this);
+        }
+
+        STACK_WIND (frame, glupy_fsetxattr_cbk, xl, xl->fops->fsetxattr,
+                    fd, dict, flags, xdata);
+}
+
+
+void
+unwind_fsetxattr (call_frame_t *frame, long cookie, xlator_t *this,
+                  int32_t op_ret, int32_t op_errno, dict_t *xdata)
+{
+        frame->local = NULL;
+        STACK_UNWIND_STRICT (fsetxattr, frame, op_ret, op_errno, xdata);
+
+}
+
+void
+set_fsetxattr_fop (long py_this, fop_fsetxattr_t fop)
+{
+        glupy_private_t *priv   = ((xlator_t *)py_this)->private;
+
+        priv->fops[GLUPY_FSETXATTR] = (long)fop;
+}
+
+void
+set_fsetxattr_cbk (long py_this, fop_fsetxattr_cbk_t cbk)
+{
+        glupy_private_t *priv   = ((xlator_t *)py_this)->private;
+
+        priv->cbks[GLUPY_FSETXATTR] = (long)cbk;
+}
+
+/* FOP: FGETXATTR */
+
+int32_t
+glupy_fgetxattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                     int32_t op_ret, int32_t op_errno, dict_t *dict,
+                     dict_t *xdata)
+{
+        glupy_private_t *priv = this->private;
+        PyGILState_STATE gstate;
+        int32_t ret;
+
+        if (!priv->cbks[GLUPY_FGETXATTR]) {
+                goto unwind;
+        }
+
+        gstate = glupy_enter();
+        ret = ((fop_fgetxattr_cbk_t)(priv->cbks[GLUPY_FGETXATTR]))(
+                frame, cookie, this, op_ret, op_errno, dict,
+                xdata);
+        glupy_leave(gstate);
+
+        return ret;
+
+unwind:
+        frame->local = NULL;
+        STACK_UNWIND_STRICT (fgetxattr, frame, op_ret, op_errno, dict,
+                             xdata);
+        return 0;
+}
+
+int32_t
+glupy_fgetxattr (call_frame_t *frame, xlator_t *this, fd_t *fd,
+                 const char *name, dict_t *xdata)
+{
+        glupy_private_t *priv = this->private;
+        PyGILState_STATE gstate;
+        int32_t ret;
+        static long next_id = 0;
+
+        if (!priv->fops[GLUPY_FGETXATTR]) {
+                goto wind;
+        }
+
+        gstate = glupy_enter();
+        frame->local = (void *)++next_id;
+        ret = ((fop_fgetxattr_t)(priv->fops[GLUPY_FGETXATTR]))(
+                frame, this, fd, name, xdata);
+        glupy_leave(gstate);
+
+        return ret;
+
+wind:
+        STACK_WIND (frame, glupy_fgetxattr_cbk, FIRST_CHILD(this),
+                    FIRST_CHILD(this)->fops->fgetxattr, fd, name,
+                    xdata);
+        return 0;
+}
+
+void
+wind_fgetxattr (call_frame_t *frame, xlator_t *xl, fd_t *fd,
+                const char *name, dict_t *xdata)
+{
+        xlator_t        *this = THIS;
+
+        if (!xl || (xl == this)) {
+                xl = FIRST_CHILD(this);
+        }
+
+        STACK_WIND (frame, glupy_fgetxattr_cbk, xl, xl->fops->fgetxattr,
+                    fd, name, xdata);
+}
+
+
+void
+unwind_fgetxattr (call_frame_t *frame, long cookie, xlator_t *this,
+                  int32_t op_ret, int32_t op_errno, dict_t *dict,
+                  dict_t *xdata)
+{
+        frame->local = NULL;
+        STACK_UNWIND_STRICT (fgetxattr, frame, op_ret, op_errno, dict,
+                             xdata);
+
+}
+
+
+void
+set_fgetxattr_fop (long py_this, fop_fgetxattr_t fop)
+{
+        glupy_private_t *priv   = ((xlator_t *)py_this)->private;
+
+        priv->fops[GLUPY_FGETXATTR] = (long)fop;
+}
+
+
+void
+set_fgetxattr_cbk (long py_this, fop_fgetxattr_cbk_t cbk)
+{
+        glupy_private_t *priv   = ((xlator_t *)py_this)->private;
+
+        priv->cbks[GLUPY_FGETXATTR] = (long)cbk;
+}
+
+/* FOP:REMOVEXATTR */
+
+int32_t
+glupy_removexattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                    int32_t op_ret, int32_t op_errno, dict_t *xdata)
+{
+        glupy_private_t *priv = this->private;
+        PyGILState_STATE gstate;
+        int32_t ret;
+
+        if (!priv->cbks[GLUPY_REMOVEXATTR]) {
+                goto unwind;
+        }
+
+        gstate = glupy_enter();
+        ret = ((fop_removexattr_cbk_t)(priv->cbks[GLUPY_REMOVEXATTR]))(
+                frame, cookie, this, op_ret, op_errno, xdata);
+        glupy_leave(gstate);
+
+        return ret;
+
+unwind:
+        frame->local = NULL;
+        STACK_UNWIND_STRICT (removexattr, frame, op_ret, op_errno, xdata);
+        return 0;
+}
+
+int32_t
+glupy_removexattr (call_frame_t *frame, xlator_t *this, loc_t *loc,
+                   const char *name, dict_t *xdata)
+{
+        glupy_private_t *priv = this->private;
+        PyGILState_STATE gstate;
+        int32_t ret;
+        static long next_id = 0;
+
+        if (!priv->fops[GLUPY_REMOVEXATTR]) {
+                goto wind;
+        }
+
+        gstate = glupy_enter();
+        frame->local = (void *)++next_id;
+        ret = ((fop_removexattr_t)(priv->fops[GLUPY_REMOVEXATTR]))(
+                frame, this, loc, name, xdata);
+        glupy_leave(gstate);
+
+        return ret;
+
+wind:
+        STACK_WIND (frame, glupy_removexattr_cbk, FIRST_CHILD(this),
+                    FIRST_CHILD(this)->fops->removexattr, loc, name,
+                    xdata);
+        return 0;
+}
+
+void
+wind_removexattr (call_frame_t *frame, xlator_t *xl, loc_t *loc,
+                  const char *name, dict_t *xdata)
+{
+        xlator_t        *this = THIS;
+
+        if (!xl || (xl == this)) {
+                xl = FIRST_CHILD(this);
+        }
+
+        STACK_WIND (frame, glupy_removexattr_cbk, xl, xl->fops->removexattr,
+                    loc, name, xdata);
+}
+
+
+void
+unwind_removexattr (call_frame_t *frame, long cookie, xlator_t *this,
+                    int32_t op_ret, int32_t op_errno, dict_t *xdata)
+{
+        frame->local = NULL;
+        STACK_UNWIND_STRICT (removexattr, frame, op_ret, op_errno, xdata);
+
+}
+
+void
+set_removexattr_fop (long py_this, fop_removexattr_t fop)
+{
+        glupy_private_t *priv   = ((xlator_t *)py_this)->private;
+
+        priv->fops[GLUPY_REMOVEXATTR] = (long)fop;
+}
+
+void
+set_removexattr_cbk (long py_this, fop_removexattr_cbk_t cbk)
+{
+        glupy_private_t *priv   = ((xlator_t *)py_this)->private;
+
+        priv->cbks[GLUPY_REMOVEXATTR] = (long)cbk;
+}
+
+
+/* FOP:FREMOVEXATTR */
+
+int32_t
+glupy_fremovexattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                    int32_t op_ret, int32_t op_errno, dict_t *xdata)
+{
+        glupy_private_t *priv = this->private;
+        PyGILState_STATE gstate;
+        int32_t ret;
+
+        if (!priv->cbks[GLUPY_FREMOVEXATTR]) {
+                goto unwind;
+        }
+
+        gstate = glupy_enter();
+        ret = ((fop_fremovexattr_cbk_t)(priv->cbks[GLUPY_FREMOVEXATTR]))(
+                frame, cookie, this, op_ret, op_errno, xdata);
+        glupy_leave(gstate);
+
+        return ret;
+
+unwind:
+        frame->local = NULL;
+        STACK_UNWIND_STRICT (fremovexattr, frame, op_ret, op_errno, xdata);
+        return 0;
+}
+
+int32_t
+glupy_fremovexattr (call_frame_t *frame, xlator_t *this, fd_t *fd,
+                   const char *name, dict_t *xdata)
+{
+        glupy_private_t *priv = this->private;
+        PyGILState_STATE gstate;
+        int32_t ret;
+        static long next_id = 0;
+
+        if (!priv->fops[GLUPY_FREMOVEXATTR]) {
+                goto wind;
+        }
+
+        gstate = glupy_enter();
+        frame->local = (void *)++next_id;
+        ret = ((fop_fremovexattr_t)(priv->fops[GLUPY_FREMOVEXATTR]))(
+                frame, this, fd, name, xdata);
+        glupy_leave(gstate);
+
+        return ret;
+
+wind:
+        STACK_WIND (frame, glupy_fremovexattr_cbk, FIRST_CHILD(this),
+                    FIRST_CHILD(this)->fops->fremovexattr, fd, name,
+                    xdata);
+        return 0;
+}
+
+void
+wind_fremovexattr (call_frame_t *frame, xlator_t *xl, fd_t *fd,
+                   const char *name, dict_t *xdata)
+{
+        xlator_t        *this = THIS;
+
+        if (!xl || (xl == this)) {
+                xl = FIRST_CHILD(this);
+        }
+
+        STACK_WIND (frame, glupy_fremovexattr_cbk, xl, xl->fops->fremovexattr,
+                    fd, name, xdata);
+}
+
+
+void
+unwind_fremovexattr (call_frame_t *frame, long cookie, xlator_t *this,
+                     int32_t op_ret, int32_t op_errno, dict_t *xdata)
+{
+        frame->local = NULL;
+        STACK_UNWIND_STRICT (fremovexattr, frame, op_ret, op_errno, xdata);
+
+}
+
+void
+set_fremovexattr_fop (long py_this, fop_fremovexattr_t fop)
+{
+        glupy_private_t *priv   = ((xlator_t *)py_this)->private;
+
+        priv->fops[GLUPY_FREMOVEXATTR] = (long)fop;
+}
+
+void
+set_fremovexattr_cbk (long py_this, fop_fremovexattr_cbk_t cbk)
+{
+        glupy_private_t *priv   = ((xlator_t *)py_this)->private;
+
+        priv->cbks[GLUPY_FREMOVEXATTR] = (long)cbk;
+}
+
+
+/* FOP: LINK*/
+int32_t
+glupy_link_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                int32_t op_ret, int32_t op_errno, inode_t *inode,
+                struct iatt *buf, struct iatt *preparent,
+                struct iatt *postparent, dict_t *xdata)
+{
+        glupy_private_t *priv = this->private;
+        PyGILState_STATE gstate;
+        int32_t ret;
+
+        if (!priv->cbks[GLUPY_LINK]) {
+                goto unwind;
+        }
+
+        gstate = glupy_enter();
+        ret = ((fop_link_cbk_t)(priv->cbks[GLUPY_LINK]))(
+                frame, cookie, this, op_ret, op_errno,
+                inode, buf, preparent, postparent, xdata);
+        glupy_leave(gstate);
+
+        return ret;
+
+unwind:
+        frame->local = NULL;
+        STACK_UNWIND_STRICT (link, frame, op_ret, op_errno, inode, buf,
+                             preparent, postparent, xdata);
+        return 0;
+}
+
+int32_t
+glupy_link(call_frame_t *frame, xlator_t *this, loc_t *oldloc, loc_t *newloc,
+           dict_t *xdata)
+{
+        glupy_private_t *priv = this->private;
+        PyGILState_STATE gstate;
+        int32_t ret;
+        static long next_id = 0;
+
+        if (!priv->fops[GLUPY_LINK]) {
+                goto wind;
+        }
+
+        gstate = glupy_enter();
+        frame->local = (void *)++next_id;
+        ret = ((fop_link_t)(priv->fops[GLUPY_LINK]))(
+                frame, this, oldloc, newloc, xdata);
+        glupy_leave(gstate);
+
+        return ret;
+
+wind:
+        STACK_WIND (frame, glupy_link_cbk, FIRST_CHILD(this),
+                    FIRST_CHILD(this)->fops->link, oldloc, newloc,
+                    xdata);
+        return 0;
+}
+
+void
+wind_link (call_frame_t *frame, xlator_t *xl, loc_t *oldloc, loc_t *newloc,
+           dict_t *xdata)
+{
+        xlator_t        *this = THIS;
+
+        if (!xl || (xl == this)) {
+                xl = FIRST_CHILD(this);
+        }
+
+        STACK_WIND (frame, glupy_link_cbk, xl, xl->fops->link,
+                    oldloc, newloc, xdata);
+}
+
+void
+unwind_link (call_frame_t *frame, long cookie, xlator_t *this,
+             int32_t op_ret, int32_t op_errno, inode_t *inode,
+             struct iatt *buf, struct iatt *preparent,
+             struct iatt *postparent, dict_t *xdata)
+{
+        frame->local = NULL;
+        STACK_UNWIND_STRICT (link, frame, op_ret, op_errno, inode, buf,
+                             preparent, postparent, xdata);
+}
+
+void
+set_link_fop (long py_this, fop_link_t fop)
+{
+        glupy_private_t *priv   = ((xlator_t *)py_this)->private;
+
+        priv->fops[GLUPY_LINK] = (long)fop;
+}
+
+void
+set_link_cbk (long py_this, fop_link_cbk_t cbk)
+{
+        glupy_private_t *priv   = ((xlator_t *)py_this)->private;
+
+        priv->cbks[GLUPY_LINK] = (long)cbk;
+}
+
+/* FOP: SYMLINK*/
+int32_t
+glupy_symlink_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                   int32_t op_ret, int32_t op_errno, inode_t *inode,
+                   struct iatt *buf, struct iatt *preparent,
+                   struct iatt *postparent, dict_t *xdata)
+{
+        glupy_private_t *priv = this->private;
+        PyGILState_STATE gstate;
+        int32_t ret;
+
+        if (!priv->cbks[GLUPY_SYMLINK]) {
+                goto unwind;
+        }
+
+        gstate = glupy_enter();
+        ret = ((fop_symlink_cbk_t)(priv->cbks[GLUPY_SYMLINK]))(
+                frame, cookie, this, op_ret, op_errno,
+                inode, buf, preparent, postparent, xdata);
+        glupy_leave(gstate);
+
+        return ret;
+
+unwind:
+        frame->local = NULL;
+        STACK_UNWIND_STRICT (symlink, frame, op_ret, op_errno, inode, buf,
+                             preparent, postparent, xdata);
+        return 0;
+}
+
+int32_t
+glupy_symlink(call_frame_t *frame, xlator_t *this, const char *linkname,
+              loc_t *loc, mode_t umask, dict_t *xdata)
+{
+        glupy_private_t *priv = this->private;
+        PyGILState_STATE gstate;
+        int32_t ret;
+        static long next_id = 0;
+
+        if (!priv->fops[GLUPY_SYMLINK]) {
+                goto wind;
+        }
+
+        gstate = glupy_enter();
+        frame->local = (void *)++next_id;
+        ret = ((fop_symlink_t)(priv->fops[GLUPY_SYMLINK]))(
+                frame, this, linkname, loc, umask, xdata);
+        glupy_leave(gstate);
+
+        return ret;
+
+wind:
+        STACK_WIND (frame, glupy_symlink_cbk, FIRST_CHILD(this),
+                    FIRST_CHILD(this)->fops->symlink, linkname, loc,
+                    umask, xdata);
+        return 0;
+}
+
+void
+wind_symlink (call_frame_t *frame, xlator_t *xl, const char *linkname,
+              loc_t *loc, mode_t umask, dict_t *xdata)
+{
+        xlator_t        *this = THIS;
+
+        if (!xl || (xl == this)) {
+                xl = FIRST_CHILD(this);
+        }
+
+        STACK_WIND (frame, glupy_symlink_cbk, xl, xl->fops->symlink,
+                    linkname, loc, umask, xdata);
+}
+
+void
+unwind_symlink (call_frame_t *frame, long cookie, xlator_t *this,
+                int32_t op_ret, int32_t op_errno, inode_t *inode,
+                struct iatt *buf, struct iatt *preparent,
+                struct iatt *postparent, dict_t *xdata)
+{
+        frame->local = NULL;
+        STACK_UNWIND_STRICT (symlink, frame, op_ret, op_errno, inode, buf,
+                             preparent, postparent, xdata);
+}
+
+void
+set_symlink_fop (long py_this, fop_symlink_t fop)
+{
+        glupy_private_t *priv   = ((xlator_t *)py_this)->private;
+
+        priv->fops[GLUPY_SYMLINK] = (long)fop;
+}
+
+void
+set_symlink_cbk (long py_this, fop_symlink_cbk_t cbk)
+{
+        glupy_private_t *priv   = ((xlator_t *)py_this)->private;
+
+        priv->cbks[GLUPY_SYMLINK] = (long)cbk;
+}
+
+
+/* FOP: READLINK */
+int32_t
+glupy_readlink_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                    int32_t op_ret, int32_t op_errno, const char *path,
+                    struct iatt *buf, dict_t *xdata)
+{
+        glupy_private_t *priv = this->private;
+        PyGILState_STATE gstate;
+        int32_t ret;
+
+        if (!priv->cbks[GLUPY_READLINK]) {
+                goto unwind;
+        }
+
+        gstate = glupy_enter();
+        ret = ((fop_readlink_cbk_t)(priv->cbks[GLUPY_READLINK]))(
+                frame, cookie, this, op_ret, op_errno,
+                path, buf, xdata);
+        glupy_leave(gstate);
+
+        return ret;
+
+unwind:
+        frame->local = NULL;
+        STACK_UNWIND_STRICT (readlink, frame, op_ret, op_errno, path,
+                             buf, xdata);
+        return 0;
+}
+
+int32_t
+glupy_readlink (call_frame_t *frame, xlator_t *this, loc_t *loc,
+                size_t size, dict_t *xdata)
+{
+        glupy_private_t *priv = this->private;
+        PyGILState_STATE gstate;
+        int32_t ret;
+        static long next_id = 0;
+
+        if (!priv->fops[GLUPY_READLINK]) {
+                goto wind;
+        }
+
+        gstate = glupy_enter();
+        frame->local = (void *)++next_id;
+        ret = ((fop_readlink_t)(priv->fops[GLUPY_READLINK]))(
+                frame, this, loc, size, xdata);
+        glupy_leave(gstate);
+
+        return ret;
+
+wind:
+        STACK_WIND (frame, glupy_readlink_cbk, FIRST_CHILD(this),
+                    FIRST_CHILD(this)->fops->readlink, loc,
+                    size, xdata);
+        return 0;
+}
+
+void
+wind_readlink (call_frame_t *frame, xlator_t *xl, loc_t *loc,
+               size_t size, dict_t *xdata)
+{
+        xlator_t        *this = THIS;
+
+        if (!xl || (xl == this)) {
+                xl = FIRST_CHILD(this);
+        }
+
+        STACK_WIND (frame, glupy_readlink_cbk, xl, xl->fops->readlink,
+                    loc, size, xdata);
+}
+
+void
+unwind_readlink (call_frame_t *frame, long cookie, xlator_t *this,
+                 int32_t op_ret, int32_t op_errno, const char *path,
+                 struct iatt *buf, dict_t *xdata)
+{
+        frame->local = NULL;
+        STACK_UNWIND_STRICT (readlink, frame, op_ret, op_errno, path, buf,
+                             xdata);
+}
+
+void
+set_readlink_fop (long py_this, fop_readlink_t fop)
+{
+        glupy_private_t *priv   = ((xlator_t *)py_this)->private;
+
+        priv->fops[GLUPY_READLINK] = (long)fop;
+}
+
+void
+set_readlink_cbk (long py_this, fop_readlink_cbk_t cbk)
+{
+        glupy_private_t *priv   = ((xlator_t *)py_this)->private;
+
+        priv->cbks[GLUPY_READLINK] = (long)cbk;
+}
+
+
+/* FOP: UNLINK */
+
+int32_t
+glupy_unlink_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                  int32_t op_ret, int32_t op_errno,
+                  struct iatt *preparent, struct iatt *postparent,
+                  dict_t *xdata)
+{
+        glupy_private_t *priv = this->private;
+        PyGILState_STATE gstate;
+        int32_t ret;
+
+        if (!priv->cbks[GLUPY_UNLINK]) {
+                goto unwind;
+        }
+
+        gstate = glupy_enter();
+        ret = ((fop_unlink_cbk_t)(priv->cbks[GLUPY_UNLINK]))(
+                frame, cookie, this, op_ret, op_errno,
+                preparent, postparent, xdata);
+        glupy_leave(gstate);
+
+        return ret;
+
+unwind:
+        frame->local = NULL;
+        STACK_UNWIND_STRICT (unlink, frame, op_ret, op_errno, preparent,
+                             postparent, xdata);
+        return 0;
+}
+
+int32_t
+glupy_unlink (call_frame_t *frame, xlator_t *this, loc_t *loc,
+              int xflags, dict_t *xdata)
+{
+        glupy_private_t *priv = this->private;
+        PyGILState_STATE gstate;
+        int32_t ret;
+        static long next_id = 0;
+
+        if (!priv->fops[GLUPY_UNLINK]) {
+                goto wind;
+        }
+
+        gstate = glupy_enter();
+        frame->local = (void *)++next_id;
+        ret = ((fop_unlink_t)(priv->fops[GLUPY_UNLINK]))(
+                frame, this, loc, xflags, xdata);
+        glupy_leave(gstate);
+
+        return ret;
+
+wind:
+        STACK_WIND (frame, glupy_unlink_cbk, FIRST_CHILD(this),
+                    FIRST_CHILD(this)->fops->unlink, loc,
+                    xflags, xdata);
+        return 0;
+}
+
+void
+wind_unlink (call_frame_t *frame, xlator_t *xl, loc_t *loc,
+             int xflags, dict_t *xdata)
+{
+        xlator_t        *this = THIS;
+
+        if (!xl || (xl == this)) {
+                xl = FIRST_CHILD(this);
+        }
+
+        STACK_WIND (frame, glupy_unlink_cbk, xl, xl->fops->unlink,
+                    loc, xflags, xdata);
+}
+
+void
+unwind_unlink (call_frame_t *frame, long cookie, xlator_t *this,
+               int32_t op_ret, int32_t op_errno,
+               struct iatt *preparent, struct iatt *postparent,
+               dict_t *xdata)
+{
+        frame->local = NULL;
+        STACK_UNWIND_STRICT (unlink, frame, op_ret, op_errno,
+                             preparent, postparent, xdata);
+}
+
+void
+set_unlink_fop (long py_this, fop_unlink_t fop)
+{
+        glupy_private_t *priv   = ((xlator_t *)py_this)->private;
+
+        priv->fops[GLUPY_UNLINK] = (long)fop;
+}
+
+void
+set_unlink_cbk (long py_this, fop_unlink_cbk_t cbk)
+{
+        glupy_private_t *priv   = ((xlator_t *)py_this)->private;
+
+        priv->cbks[GLUPY_UNLINK] = (long)cbk;
+}
+
+
+/* FOP: MKDIR */
+
+int32_t
+glupy_mkdir_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                 int32_t op_ret, int32_t op_errno, inode_t *inode,
+                 struct iatt *buf, struct iatt *preparent,
+                 struct iatt *postparent, dict_t *xdata)
+{
+        glupy_private_t *priv = this->private;
+        PyGILState_STATE gstate;
+        int32_t ret;
+
+        if (!priv->cbks[GLUPY_MKDIR]) {
+                goto unwind;
+        }
+
+        gstate = glupy_enter();
+        ret = ((fop_mkdir_cbk_t)(priv->cbks[GLUPY_MKDIR]))(
+                frame, cookie, this, op_ret, op_errno,
+                inode, buf, preparent, postparent, xdata);
+        glupy_leave(gstate);
+
+        return ret;
+
+unwind:
+        frame->local = NULL;
+        STACK_UNWIND_STRICT (mkdir, frame, op_ret, op_errno, inode, buf,
+                             preparent, postparent, xdata);
+        return 0;
+}
+
+int32_t
+glupy_mkdir (call_frame_t *frame, xlator_t *this, loc_t *loc, mode_t mode,
+             mode_t umask, dict_t *xdata)
+{
+        glupy_private_t *priv = this->private;
+        PyGILState_STATE gstate;
+        int32_t ret;
+        static long next_id = 0;
+
+        if (!priv->fops[GLUPY_MKDIR]) {
+                goto wind;
+        }
+
+        gstate = glupy_enter();
+        frame->local = (void *)++next_id;
+        ret = ((fop_mkdir_t)(priv->fops[GLUPY_MKDIR]))(
+                frame, this, loc, mode, umask, xdata);
+        glupy_leave(gstate);
+
+        return ret;
+
+wind:
+        STACK_WIND (frame, glupy_mkdir_cbk, FIRST_CHILD(this),
+                    FIRST_CHILD(this)->fops->mkdir, loc, mode, umask,
+                    xdata);
+        return 0;
+}
+
+void
+wind_mkdir (call_frame_t *frame, xlator_t *xl, loc_t *loc, mode_t mode,
+            mode_t umask, dict_t *xdata)
+{
+
+        xlator_t        *this = THIS;
+
+        if (!xl || (xl == this)) {
+                xl = FIRST_CHILD(this);
+        }
+
+        STACK_WIND (frame, glupy_mkdir_cbk, xl, xl->fops->mkdir,
+                    loc, mode, umask, xdata);
+}
+
+void
+unwind_mkdir (call_frame_t *frame, long cookie, xlator_t *this,
+              int32_t op_ret, int32_t op_errno, inode_t *inode,
+              struct iatt *buf, struct iatt *preparent,
+              struct iatt *postparent, dict_t *xdata)
+{
+        frame->local = NULL;
+        STACK_UNWIND_STRICT (mkdir, frame, op_ret, op_errno, inode, buf,
+                             preparent, postparent, xdata);
+}
+
+void
+set_mkdir_fop (long py_this, fop_mkdir_t fop)
+{
+        glupy_private_t *priv   = ((xlator_t *)py_this)->private;
+
+        priv->fops[GLUPY_MKDIR] = (long)fop;
+}
+
+void
+set_mkdir_cbk (long py_this, fop_mkdir_cbk_t cbk)
+{
+        glupy_private_t *priv   = ((xlator_t *)py_this)->private;
+
+        priv->cbks[GLUPY_MKDIR] = (long)cbk;
+}
+
+
+/* FOP: RMDIR */
+
+int32_t
+glupy_rmdir_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                 int32_t op_ret, int32_t op_errno,
+                 struct iatt *preparent, struct iatt *postparent,
+                 dict_t *xdata)
+{
+        glupy_private_t *priv = this->private;
+        PyGILState_STATE gstate;
+        int32_t ret;
+
+        if (!priv->cbks[GLUPY_RMDIR]) {
+                goto unwind;
+        }
+
+        gstate = glupy_enter();
+        ret = ((fop_rmdir_cbk_t)(priv->cbks[GLUPY_RMDIR]))(
+                frame, cookie, this, op_ret, op_errno,
+                preparent, postparent, xdata);
+        glupy_leave(gstate);
+
+        return ret;
+
+unwind:
+        frame->local = NULL;
+        STACK_UNWIND_STRICT (rmdir, frame, op_ret, op_errno, preparent,
+                             postparent, xdata);
+        return 0;
+}
+
+int32_t
+glupy_rmdir (call_frame_t *frame, xlator_t *this, loc_t *loc,
+             int xflags, dict_t *xdata)
+{
+        glupy_private_t *priv = this->private;
+        PyGILState_STATE gstate;
+        int32_t ret;
+        static long next_id = 0;
+
+        if (!priv->fops[GLUPY_RMDIR]) {
+                goto wind;
+        }
+
+        gstate = glupy_enter();
+        frame->local = (void *)++next_id;
+        ret = ((fop_rmdir_t)(priv->fops[GLUPY_RMDIR]))(
+                frame, this, loc, xflags, xdata);
+        glupy_leave(gstate);
+
+        return ret;
+
+wind:
+        STACK_WIND (frame, glupy_rmdir_cbk, FIRST_CHILD(this),
+                    FIRST_CHILD(this)->fops->rmdir, loc,
+                    xflags, xdata);
+        return 0;
+}
+
+void
+wind_rmdir (call_frame_t *frame, xlator_t *xl, loc_t *loc,
+            int xflags, dict_t *xdata)
+{
+
+        xlator_t        *this = THIS;
+
+        if (!xl || (xl == this)) {
+                xl = FIRST_CHILD(this);
+        }
+
+        STACK_WIND (frame, glupy_rmdir_cbk, xl, xl->fops->rmdir,
+                    loc, xflags, xdata);
+}
+
+void
+unwind_rmdir (call_frame_t *frame, long cookie, xlator_t *this,
+              int32_t op_ret, int32_t op_errno,
+              struct iatt *preparent, struct iatt *postparent,
+              dict_t *xdata)
+{
+        frame->local = NULL;
+        STACK_UNWIND_STRICT (rmdir, frame, op_ret, op_errno,
+                             preparent, postparent, xdata);
+}
+
+void
+set_rmdir_fop (long py_this, fop_rmdir_t fop)
+{
+        glupy_private_t *priv   = ((xlator_t *)py_this)->private;
+
+        priv->fops[GLUPY_RMDIR] = (long)fop;
+}
+
+void
+set_rmdir_cbk (long py_this, fop_rmdir_cbk_t cbk)
+{
+        glupy_private_t *priv   = ((xlator_t *)py_this)->private;
+
+        priv->cbks[GLUPY_RMDIR] = (long)cbk;
+}
+
+
+/* NON-FOP-SPECIFIC CODE */
+
+
+long
+get_id (call_frame_t *frame)
+{
+        return (long)(frame->local);
+}
+
+uint64_t
+get_rootunique (call_frame_t *frame)
+{
+        return frame->root->unique;
+}
+
+int32_t
+init (xlator_t *this)
+{
+        glupy_private_t         *priv           = NULL;
+        char                    *module_name    = NULL;
+        PyObject                *py_mod_name    = NULL;
+        PyObject                *py_init_func   = NULL;
+        PyObject                *py_args        = NULL;
+        PyObject                *syspath        = NULL;
+	PyObject                *path           = NULL;
+	static gf_boolean_t      py_inited      = _gf_false;
+        void *                   err_cleanup    = &&err_return;
+
+        if (dict_get_str(this->options,"module-name",&module_name) != 0) {
+                gf_log (this->name, GF_LOG_ERROR, "missing module-name");
+                return -1;
+        }
+
+	priv = GF_CALLOC (1, sizeof (glupy_private_t), gf_glupy_mt_priv);
+        if (!priv) {
+                goto *err_cleanup;
+        }
+        this->private = priv;
+        err_cleanup = &&err_free_priv;
+
+	if (!py_inited) {
+                Py_Initialize();
+                PyEval_InitThreads();
+#if 0
+                (void)pthread_key_create(&gil_init_key,NULL);
+                (void)pthread_setspecific(gil_init_key,(void *)1);
+#endif
+                /* PyEval_InitThreads takes this "for" us.  No thanks. */
+                PyEval_ReleaseLock();
+                py_inited = _gf_true;
+        }
+
+	/* Adjust python's path */
+	syspath = PySys_GetObject("path");
+	path = PyString_FromString(GLUSTER_PYTHON_PATH);
+	PyList_Append(syspath, path);
+	Py_DECREF(path);
+
+	py_mod_name = PyString_FromString(module_name);
+        if (!py_mod_name) {
+                gf_log (this->name, GF_LOG_ERROR, "could not create name");
+                if (PyErr_Occurred()) {
+                        PyErr_Print();
+                }
+                goto *err_cleanup;
+        }
+
+        gf_log (this->name, GF_LOG_ERROR, "py_mod_name = %s", module_name);
+        priv->py_module = PyImport_Import(py_mod_name);
+        Py_DECREF(py_mod_name);
+        if (!priv->py_module) {
+                gf_log (this->name, GF_LOG_ERROR, "Python import failed");
+                if (PyErr_Occurred()) {
+                        PyErr_Print();
+                }
+                goto *err_cleanup;
+        }
+        err_cleanup = &&err_deref_module;
+
+        py_init_func = PyObject_GetAttrString(priv->py_module, "xlator");
+        if (!py_init_func || !PyCallable_Check(py_init_func)) {
+                gf_log (this->name, GF_LOG_ERROR, "missing init func");
+                if (PyErr_Occurred()) {
+                        PyErr_Print();
+                }
+                goto *err_cleanup;
+        }
+        err_cleanup = &&err_deref_init;
+
+        py_args = PyTuple_New(1);
+        if (!py_args) {
+                gf_log (this->name, GF_LOG_ERROR, "could not create args");
+                if (PyErr_Occurred()) {
+                        PyErr_Print();
+                }
+                goto *err_cleanup;
+        }
+        PyTuple_SetItem(py_args,0,PyLong_FromLong((long)this));
+
+        /* TBD: pass in list of children */
+        priv->py_xlator = PyObject_CallObject(py_init_func, py_args);
+        Py_DECREF(py_args);
+        if (!priv->py_xlator) {
+                gf_log (this->name, GF_LOG_ERROR, "Python init failed");
+                if (PyErr_Occurred()) {
+                        PyErr_Print();
+                }
+                goto *err_cleanup;
+        }
+        gf_log (this->name, GF_LOG_INFO, "init returned %p", priv->py_xlator);
+
+        return 0;
+
+err_deref_init:
+        Py_DECREF(py_init_func);
+err_deref_module:
+        Py_DECREF(priv->py_module);
+err_free_priv:
+        GF_FREE(priv);
+err_return:
+        return -1;
+}
+
+void
+fini (xlator_t *this)
+{
+        glupy_private_t *priv = this->private;
+
+        if (!priv)
+                return;
+        Py_DECREF(priv->py_xlator);
+        Py_DECREF(priv->py_module);
+        this->private = NULL;
+        GF_FREE (priv);
+
+        return;
+}
+
+struct xlator_fops fops = {
+        .lookup       = glupy_lookup,
+        .create       = glupy_create,
+        .open         = glupy_open,
+        .readv        = glupy_readv,
+        .writev       = glupy_writev,
+        .opendir      = glupy_opendir,
+        .readdir      = glupy_readdir,
+        .stat         = glupy_stat,
+        .fstat        = glupy_fstat,
+        .setxattr     = glupy_setxattr,
+        .getxattr     = glupy_getxattr,
+        .fsetxattr    = glupy_fsetxattr,
+        .fgetxattr    = glupy_fgetxattr,
+        .removexattr  = glupy_removexattr,
+        .fremovexattr = glupy_fremovexattr,
+        .link         = glupy_link,
+        .unlink       = glupy_unlink,
+        .readlink     = glupy_readlink,
+        .symlink      = glupy_symlink,
+        .mkdir        = glupy_mkdir,
+        .rmdir        = glupy_rmdir,
+        .statfs       = glupy_statfs,
+        .readdirp     = glupy_readdirp
+};
+
+struct xlator_cbks cbks = {
+};
+
+struct volume_options options[] = {
+        { .key  = {NULL} },
+};
diff --git a/xlators/features/glupy/src/glupy.h b/xlators/features/glupy/src/glupy.h
new file mode 100644
index 000000000..8661fce88
--- /dev/null
+++ b/xlators/features/glupy/src/glupy.h
@@ -0,0 +1,69 @@
+/*
+   Copyright (c) 2006-2011 Gluster, Inc. <http://www.gluster.com>
+   This file is part of GlusterFS.
+
+   GlusterFS is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published
+   by the Free Software Foundation; either version 3 of the License,
+   or (at your option) any later version.
+
+   GlusterFS is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see
+   <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __GLUPY_H__
+#define __GLUPY_H__
+
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+#include "mem-types.h"
+
+enum {
+        GLUPY_LOOKUP = 0,
+        GLUPY_CREATE,
+        GLUPY_OPEN,
+        GLUPY_READV,
+        GLUPY_WRITEV,
+        GLUPY_OPENDIR,
+        GLUPY_READDIR,
+        GLUPY_READDIRP,
+        GLUPY_STAT,
+        GLUPY_FSTAT,
+        GLUPY_STATFS,
+        GLUPY_SETXATTR,
+        GLUPY_GETXATTR,
+        GLUPY_FSETXATTR,
+        GLUPY_FGETXATTR,
+        GLUPY_REMOVEXATTR,
+        GLUPY_FREMOVEXATTR,
+        GLUPY_LINK,
+        GLUPY_UNLINK,
+        GLUPY_READLINK,
+        GLUPY_SYMLINK,
+        GLUPY_MKNOD,
+        GLUPY_MKDIR,
+        GLUPY_RMDIR,
+        GLUPY_N_FUNCS
+};
+
+typedef struct {
+        PyObject        *py_module;
+        PyObject        *py_xlator;
+        long            fops[GLUPY_N_FUNCS];
+        long            cbks[GLUPY_N_FUNCS];
+} glupy_private_t;
+
+enum gf_glupy_mem_types_ {
+        gf_glupy_mt_priv = gf_common_mt_end + 1,
+        gf_glupy_mt_end
+};
+
+#endif /* __GLUPY_H__ */
diff --git a/xlators/features/glupy/src/gluster.py b/xlators/features/glupy/src/gluster.py
new file mode 100644
index 000000000..a5daa77d3
--- /dev/null
+++ b/xlators/features/glupy/src/gluster.py
@@ -0,0 +1,841 @@
+import sys
+from ctypes import *
+
+dl = CDLL("",RTLD_GLOBAL)
+
+
+class call_frame_t (Structure):
+        pass
+
+class dev_t (Structure):
+        pass
+
+
+class dict_t (Structure):
+        pass
+
+
+class gf_dirent_t (Structure):
+        pass
+
+
+class iobref_t (Structure):
+	pass
+
+
+class iovec_t (Structure):
+        pass
+
+
+class list_head (Structure):
+        pass
+
+list_head._fields_ = [
+                ("next", POINTER(list_head)),
+                ("prev", POINTER(list_head))
+        ]
+
+
+class rwxperm_t (Structure):
+        _fields_ = [
+                ("read", c_uint8, 1),
+                ("write", c_uint8, 1),
+                ("execn", c_uint8, 1)
+        ]
+
+
+class statvfs_t (Structure):
+        pass
+
+
+class xlator_t (Structure):
+        pass
+
+
+class ia_prot_t (Structure):
+        _fields_ = [
+                ("suid", c_uint8, 1),
+                ("sgid", c_uint8, 1),
+                ("sticky", c_uint8, 1),
+                ("owner", rwxperm_t),
+                ("group", rwxperm_t),
+                ("other", rwxperm_t)
+        ]
+
+# For checking file type.
+(IA_INVAL, IA_IFREG, IA_IFDIR, IA_IFLNK, IA_IFBLK, IA_IFCHR, IA_IFIFO,
+ IA_IFSOCK) = xrange(8)
+
+
+class iatt_t (Structure):
+        _fields_ = [
+                ("ia_no", c_uint64),
+                ("ia_gfid", c_ubyte * 16),
+                ("ia_dev", c_uint64),
+                ("ia_type", c_uint),
+                ("ia_prot", ia_prot_t),
+                ("ia_nlink", c_uint32),
+                ("ia_uid", c_uint32),
+                ("ia_gid", c_uint32),
+                ("ia_rdev", c_uint64),
+                ("ia_size", c_uint64),
+                ("ia_blksize", c_uint32),
+                ("ia_blocks", c_uint64),
+                ("ia_atime", c_uint32 ),
+                ("ia_atime_nsec", c_uint32),
+                ("ia_mtime", c_uint32),
+                ("ia_mtime_nsec", c_uint32),
+                ("ia_ctime", c_uint32),
+                ("ia_ctime_nsec", c_uint32)
+        ]
+
+
+class mem_pool (Structure):
+        _fields_ = [
+                ("list", list_head),
+                ("hot_count", c_int),
+                ("cold_count", c_int),
+                ("lock", c_void_p),
+                ("padded_sizeof_type", c_ulong),
+                ("pool", c_void_p),
+                ("pool_end", c_void_p),
+                ("real_sizeof_type", c_int),
+                ("alloc_count", c_uint64),
+                ("pool_misses", c_uint64),
+                ("max_alloc", c_int),
+                ("curr_stdalloc", c_int),
+                ("max_stdalloc", c_int),
+                ("name", c_char_p),
+                ("global_list", list_head)
+        ]
+
+
+class U_ctx_key_inode (Union):
+        _fields_ = [
+                ("key", c_uint64),
+                ("xl_key", POINTER(xlator_t))
+        ]
+
+
+class U_ctx_value1 (Union):
+        _fields_ = [
+                ("value1", c_uint64),
+                ("ptr1", c_void_p)
+        ]
+
+
+class U_ctx_value2 (Union):
+        _fields_ = [
+                ("value2", c_uint64),
+                ("ptr2", c_void_p)
+        ]
+
+class inode_ctx (Structure):
+        _anonymous_ = ("u_key","u_value1","u_value2",)
+        _fields_ = [
+                ("u_key", U_ctx_key_inode),
+                ("u_value1", U_ctx_value1),
+                ("u_value2", U_ctx_value2)
+        ]
+
+class inode_t (Structure):
+        pass
+
+class inode_table_t (Structure):
+        _fields_ = [
+                ("lock", c_void_p),
+                ("hashsize", c_size_t),
+                ("name", c_char_p),
+                ("root", POINTER(inode_t)),
+                ("xl", POINTER(xlator_t)),
+                ("lru_limit", c_uint32),
+                ("inode_hash", POINTER(list_head)),
+                ("name_hash", POINTER(list_head)),
+                ("active", list_head),
+                ("active_size", c_uint32),
+                ("lru", list_head),
+                ("lru_size", c_uint32),
+                ("purge", list_head),
+                ("purge_size", c_uint32),
+                ("inode_pool", POINTER(mem_pool)),
+                ("dentry_pool", POINTER(mem_pool)),
+                ("fd_mem_pool", POINTER(mem_pool))
+        ]
+
+inode_t._fields_ = [
+                ("table", POINTER(inode_table_t)),
+                ("gfid", c_ubyte * 16),
+                ("lock", c_void_p),
+                ("nlookup", c_uint64),
+                ("fd_count", c_uint32),
+                ("ref", c_uint32),
+                ("ia_type", c_uint),
+                ("fd_list", list_head),
+                ("dentry_list", list_head),
+                ("hashv", list_head),
+                ("listv", list_head),
+                ("ctx", POINTER(inode_ctx))
+        ]
+
+
+
+class U_ctx_key_fd (Union):
+        _fields_ = [
+                ("key", c_uint64),
+                ("xl_key", c_void_p)
+        ]
+
+class fd_lk_ctx (Structure):
+        _fields_ = [
+                ("lk_list", list_head),
+                ("ref", c_int),
+                ("lock", c_void_p)
+        ]
+
+class fd_ctx (Structure):
+        _anonymous_ = ("u_key","u_value1")
+        _fields_ = [
+                ("u_key", U_ctx_key_fd),
+                ("u_value1", U_ctx_value1)
+        ]
+
+class fd_t (Structure):
+        _fields_ = [
+                ("pid", c_uint64),
+                ("flags", c_int32),
+                ("refcount", c_int32),
+                ("inode_list", list_head),
+                ("inode", POINTER(inode_t)),
+                ("lock", c_void_p),
+                ("ctx", POINTER(fd_ctx)),
+                ("xl_count", c_int),
+                ("lk_ctx", POINTER(fd_lk_ctx)),
+                ("anonymous", c_uint)
+        ]
+
+class loc_t (Structure):
+        _fields_ = [
+                ("path", c_char_p),
+                ("name", c_char_p),
+                ("inode", POINTER(inode_t)),
+                ("parent", POINTER(inode_t)),
+                ("gfid", c_ubyte * 16),
+                ("pargfid", c_ubyte * 16),
+        ]
+
+
+
+def _init_op (a_class, fop, cbk, wind, unwind):
+        # Decorators, used by translators. We could pass the signatures as
+        # parameters, but it's actually kind of nice to keep them around for
+        # inspection.
+        a_class.fop_type = apply(CFUNCTYPE,a_class.fop_sig)
+        a_class.cbk_type = apply(CFUNCTYPE,a_class.cbk_sig)
+        # Dispatch-function registration.
+        fop.restype = None
+        fop.argtypes = [ c_long, a_class.fop_type ]
+        # Callback-function registration.
+        cbk.restype = None
+        cbk.argtypes = [ c_long, a_class.cbk_type ]
+        # STACK_WIND function.
+        wind.restype = None
+        wind.argtypes = list(a_class.fop_sig[1:])
+        # STACK_UNWIND function.
+        unwind.restype = None
+        unwind.argtypes = list(a_class.cbk_sig[1:])
+
+class OpLookup:
+        fop_sig = (c_int, POINTER(call_frame_t), POINTER(xlator_t),
+                   POINTER(loc_t), POINTER(dict_t))
+        cbk_sig = (c_int, POINTER(call_frame_t), c_long, POINTER(xlator_t),
+                   c_int, c_int, POINTER(inode_t), POINTER(iatt_t),
+                   POINTER(dict_t), POINTER(iatt_t))
+_init_op (OpLookup, dl.set_lookup_fop, dl.set_lookup_cbk,
+                    dl.wind_lookup,    dl.unwind_lookup)
+
+class OpCreate:
+        fop_sig = (c_int, POINTER(call_frame_t), POINTER(xlator_t),
+                   POINTER(loc_t), c_int, c_uint, c_uint, POINTER(fd_t),
+                   POINTER(dict_t))
+        cbk_sig = (c_int, POINTER(call_frame_t), c_long, POINTER(xlator_t),
+                   c_int, c_int, POINTER(fd_t), POINTER(inode_t),
+                   POINTER(iatt_t), POINTER(iatt_t), POINTER(iatt_t),
+                   POINTER(dict_t))
+_init_op (OpCreate, dl.set_create_fop, dl.set_create_cbk,
+                    dl.wind_create,    dl.unwind_create)
+
+class OpOpen:
+        fop_sig = (c_int, POINTER(call_frame_t), POINTER(xlator_t),
+                   POINTER(loc_t), c_int, POINTER(fd_t), POINTER(dict_t))
+        cbk_sig = (c_int, POINTER(call_frame_t), c_long, POINTER(xlator_t),
+                   c_int, c_int, POINTER(fd_t), POINTER(dict_t))
+_init_op (OpOpen, dl.set_open_fop, dl.set_open_cbk,
+                  dl.wind_open,    dl.unwind_open)
+
+class OpReadv:
+        fop_sig = (c_int, POINTER(call_frame_t), POINTER(xlator_t),
+                   POINTER(fd_t), c_size_t, c_long, c_uint32, POINTER(dict_t))
+        cbk_sig = (c_int, POINTER(call_frame_t), c_long, POINTER(xlator_t),
+                   c_int, c_int, POINTER(iovec_t), c_int, POINTER(iatt_t),
+                   POINTER(iobref_t), POINTER(dict_t))
+_init_op (OpReadv, dl.set_readv_fop, dl.set_readv_cbk,
+                   dl.wind_readv,    dl.unwind_readv)
+class OpWritev:
+        fop_sig = (c_int, POINTER(call_frame_t), POINTER(xlator_t),
+                   POINTER(fd_t), POINTER(iovec_t), c_int, c_long, c_uint32,
+                   POINTER(iobref_t), POINTER(dict_t))
+        cbk_sig = (c_int, POINTER(call_frame_t), c_long, POINTER(xlator_t),
+                   c_int, c_int, POINTER(iatt_t), POINTER(iatt_t),
+                   POINTER(dict_t))
+_init_op (OpWritev, dl.set_writev_fop, dl.set_writev_cbk,
+                    dl.wind_writev,    dl.unwind_writev)
+
+class OpOpendir:
+        fop_sig = (c_int, POINTER(call_frame_t), POINTER(xlator_t),
+                   POINTER(loc_t), POINTER(fd_t) ,POINTER(dict_t))
+        cbk_sig = (c_int, POINTER(call_frame_t), c_long, POINTER(xlator_t),
+                   c_int, c_int, POINTER(fd_t), POINTER(dict_t))
+_init_op (OpOpendir, dl.set_opendir_fop, dl.set_opendir_cbk,
+                     dl.wind_opendir,    dl.unwind_opendir)
+
+class OpReaddir:
+        fop_sig = (c_int, POINTER(call_frame_t), POINTER(xlator_t),
+                   POINTER(fd_t), c_size_t, c_long, POINTER(dict_t))
+        cbk_sig = (c_int, POINTER(call_frame_t), c_long, POINTER(xlator_t),
+                   c_int, c_int, POINTER(gf_dirent_t), POINTER(dict_t))
+_init_op (OpReaddir, dl.set_readdir_fop, dl.set_readdir_cbk,
+                     dl.wind_readdir,    dl.unwind_readdir)
+
+class OpReaddirp:
+        fop_sig = (c_int, POINTER(call_frame_t), POINTER(xlator_t),
+                   POINTER(fd_t), c_size_t, c_long, POINTER(dict_t))
+        cbk_sig = (c_int, POINTER(call_frame_t), c_long, POINTER(xlator_t),
+                   c_int, c_int, POINTER(gf_dirent_t), POINTER(dict_t))
+_init_op (OpReaddirp, dl.set_readdirp_fop, dl.set_readdirp_cbk,
+                      dl.wind_readdirp,    dl.unwind_readdirp)
+
+class OpStat:
+        fop_sig = (c_int, POINTER(call_frame_t), POINTER(xlator_t),
+                   POINTER(loc_t), POINTER(dict_t))
+        cbk_sig = (c_int, POINTER(call_frame_t), c_long, POINTER(xlator_t),
+                   c_int, c_int, POINTER(iatt_t), POINTER(dict_t))
+_init_op (OpStat, dl.set_stat_fop, dl.set_stat_cbk,
+                  dl.wind_stat,    dl.unwind_stat)
+
+class OpFstat:
+        fop_sig = (c_int, POINTER(call_frame_t), POINTER(xlator_t),
+                   POINTER(fd_t), POINTER(dict_t))
+        cbk_sig = (c_int, POINTER(call_frame_t), c_long, POINTER(xlator_t),
+                   c_int, c_int, POINTER(iatt_t), POINTER(dict_t))
+_init_op (OpFstat, dl.set_fstat_fop, dl.set_fstat_cbk,
+                   dl.wind_fstat,    dl.unwind_fstat)
+
+class OpStatfs:
+        fop_sig = (c_int, POINTER(call_frame_t), POINTER(xlator_t),
+                   POINTER(loc_t), POINTER(dict_t))
+        cbk_sig = (c_int, POINTER(call_frame_t), c_long, POINTER(xlator_t),
+                   c_int, c_int, POINTER(statvfs_t), POINTER(dict_t))
+_init_op (OpStatfs, dl.set_statfs_fop, dl.set_statfs_cbk,
+                    dl.wind_statfs,    dl.unwind_statfs)
+
+
+class OpSetxattr:
+        fop_sig = (c_int, POINTER(call_frame_t), POINTER(xlator_t),
+                   POINTER(loc_t), POINTER(dict_t), c_int32,
+                   POINTER (dict_t))
+        cbk_sig = (c_int, POINTER(call_frame_t), c_long, POINTER(xlator_t),
+                   c_int, c_int, POINTER(dict_t))
+_init_op (OpSetxattr, dl.set_setxattr_fop, dl.set_setxattr_cbk,
+                      dl.wind_setxattr,    dl.unwind_setxattr)
+
+class OpGetxattr:
+        fop_sig = (c_int, POINTER(call_frame_t), POINTER(xlator_t),
+                   POINTER(loc_t), c_char_p, POINTER (dict_t))
+        cbk_sig = (c_int, POINTER(call_frame_t), c_long, POINTER(xlator_t),
+                   c_int, c_int, POINTER(dict_t), POINTER(dict_t))
+_init_op (OpGetxattr, dl.set_getxattr_fop, dl.set_getxattr_cbk,
+                      dl.wind_getxattr,    dl.unwind_getxattr)
+
+class OpFsetxattr:
+        fop_sig = (c_int, POINTER(call_frame_t), POINTER(xlator_t),
+                   POINTER(fd_t), POINTER(dict_t), c_int32,
+                   POINTER (dict_t))
+        cbk_sig = (c_int, POINTER(call_frame_t), c_long, POINTER(xlator_t),
+                   c_int, c_int, POINTER(dict_t))
+_init_op (OpFsetxattr, dl.set_fsetxattr_fop, dl.set_fsetxattr_cbk,
+                       dl.wind_fsetxattr,    dl.unwind_fsetxattr)
+
+class OpFgetxattr:
+        fop_sig = (c_int, POINTER(call_frame_t), POINTER(xlator_t),
+                   POINTER(fd_t), c_char_p, POINTER (dict_t))
+        cbk_sig = (c_int, POINTER(call_frame_t), c_long, POINTER(xlator_t),
+                   c_int, c_int, POINTER(dict_t), POINTER(dict_t))
+_init_op (OpFgetxattr, dl.set_fgetxattr_fop, dl.set_fgetxattr_cbk,
+                       dl.wind_fgetxattr,    dl.unwind_fgetxattr)
+
+class OpRemovexattr:
+        fop_sig = (c_int, POINTER(call_frame_t), POINTER(xlator_t),
+                   POINTER(loc_t), c_char_p, POINTER(dict_t))
+        cbk_sig = (c_int, POINTER(call_frame_t), c_long, POINTER(xlator_t),
+                   c_int, c_int, POINTER(dict_t))
+_init_op (OpRemovexattr, dl.set_removexattr_fop, dl.set_removexattr_cbk,
+                         dl.wind_removexattr,    dl.unwind_removexattr)
+
+
+class OpFremovexattr:
+        fop_sig = (c_int, POINTER(call_frame_t), POINTER(xlator_t),
+                   POINTER(fd_t), c_char_p, POINTER(dict_t))
+        cbk_sig = (c_int, POINTER(call_frame_t), c_long, POINTER(xlator_t),
+                   c_int, c_int, POINTER(dict_t))
+_init_op (OpFremovexattr, dl.set_fremovexattr_fop, dl.set_fremovexattr_cbk,
+                          dl.wind_fremovexattr,    dl.unwind_fremovexattr)
+
+class OpLink:
+        fop_sig = (c_int, POINTER(call_frame_t), POINTER(xlator_t),
+                   POINTER(loc_t), POINTER(loc_t), POINTER(dict_t))
+        cbk_sig = (c_int, POINTER(call_frame_t), c_long, POINTER(xlator_t),
+                   c_int, c_int, POINTER(inode_t), POINTER(iatt_t),
+                   POINTER(iatt_t), POINTER(iatt_t), POINTER(dict_t))
+_init_op (OpLink, dl.set_link_fop, dl.set_link_cbk,
+                  dl.wind_link,    dl.unwind_link)
+
+class OpSymlink:
+        fop_sig = (c_int, POINTER(call_frame_t), POINTER(xlator_t),
+                   c_char_p, POINTER(loc_t), c_uint, POINTER(dict_t))
+        cbk_sig = (c_int, POINTER(call_frame_t), c_long, POINTER(xlator_t),
+                   c_int, c_int, POINTER(inode_t), POINTER(iatt_t),
+                   POINTER(iatt_t), POINTER(iatt_t), POINTER(dict_t))
+_init_op (OpSymlink, dl.set_symlink_fop, dl.set_symlink_cbk,
+                     dl.wind_symlink,    dl.unwind_symlink)
+
+class OpUnlink:
+        fop_sig = (c_int, POINTER(call_frame_t), POINTER(xlator_t),
+                   POINTER(loc_t), c_int, POINTER(dict_t))
+        cbk_sig = (c_int, POINTER(call_frame_t), c_long, POINTER(xlator_t),
+                   c_int, c_int, POINTER(iatt_t), POINTER(iatt_t),
+                   POINTER(dict_t))
+_init_op (OpUnlink, dl.set_unlink_fop, dl.set_unlink_cbk,
+                    dl.wind_unlink,    dl.unwind_unlink)
+
+class OpReadlink:
+        fop_sig = (c_int, POINTER(call_frame_t), POINTER(xlator_t),
+                   POINTER(loc_t), c_size_t, POINTER(dict_t))
+        cbk_sig = (c_int, POINTER(call_frame_t), c_long, POINTER(xlator_t),
+                   c_int, c_int, c_char_p, POINTER(iatt_t), POINTER(dict_t))
+_init_op (OpReadlink, dl.set_readlink_fop, dl.set_readlink_cbk,
+                      dl.wind_readlink,    dl.unwind_readlink)
+
+class OpMkdir:
+        fop_sig = (c_int, POINTER(call_frame_t), POINTER(xlator_t),
+                   POINTER(loc_t), c_uint, c_uint, POINTER(dict_t))
+        cbk_sig = (c_int, POINTER(call_frame_t), c_long, POINTER(xlator_t),
+                   c_int, c_int, POINTER(inode_t), POINTER(iatt_t),
+                   POINTER(iatt_t), POINTER(iatt_t), POINTER(dict_t))
+_init_op (OpMkdir, dl.set_mkdir_fop, dl.set_mkdir_cbk,
+                   dl.wind_mkdir,    dl.unwind_mkdir)
+
+class OpRmdir:
+        fop_sig = (c_int, POINTER(call_frame_t), POINTER(xlator_t),
+                   POINTER(loc_t), c_int, POINTER(dict_t))
+        cbk_sig = (c_int, POINTER(call_frame_t), c_long, POINTER(xlator_t),
+                   c_int, c_int, POINTER(iatt_t), POINTER(iatt_t),
+                   POINTER(dict_t))
+_init_op (OpRmdir, dl.set_rmdir_fop, dl.set_rmdir_cbk,
+                   dl.wind_rmdir,    dl.unwind_rmdir)
+
+
+class Translator:
+        def __init__ (self, c_this):
+                # This is only here to keep references to the stubs we create,
+                # because ctypes doesn't and glupy.so can't because it doesn't
+                # get a pointer to the actual Python object. It's a dictionary
+                # instead of a list in case we ever allow changing fops/cbks
+                # after initialization and need to look them up.
+                self.stub_refs = {}
+                funcs = dir(self.__class__)
+                if "lookup_fop" in funcs:
+                        @OpLookup.fop_type
+                        def stub (frame, this, loc, xdata, s=self):
+                                return s.lookup_fop (frame, this, loc, xdata)
+                        self.stub_refs["lookup_fop"] = stub
+                        dl.set_lookup_fop(c_this,stub)
+                if "lookup_cbk" in funcs:
+                        @OpLookup.cbk_type
+                        def stub (frame, cookie, this, op_ret, op_errno, inode,
+                                  buf, xdata, postparent, s=self):
+                                return s.lookup_cbk(frame, cookie, this, op_ret,
+                                                    op_errno, inode, buf, xdata,
+                                                    postparent)
+                        self.stub_refs["lookup_cbk"] = stub
+                        dl.set_lookup_cbk(c_this,stub)
+                if "create_fop" in funcs:
+                        @OpCreate.fop_type
+                        def stub (frame, this, loc, flags, mode, umask, fd,
+                                  xdata, s=self):
+                                return s.create_fop (frame, this, loc, flags,
+                                                     mode, umask, fd, xdata)
+                        self.stub_refs["create_fop"] = stub
+                        dl.set_create_fop(c_this,stub)
+                if "create_cbk" in funcs:
+                        @OpCreate.cbk_type
+                        def stub (frame, cookie, this, op_ret, op_errno, fd,
+                                  inode, buf, preparent, postparent, xdata,
+                                  s=self):
+                                return s.create_cbk (frame, cookie, this,
+                                                     op_ret, op_errno, fd,
+                                                     inode, buf, preparent,
+                                                     postparent, xdata)
+                        self.stub_refs["create_cbk"] = stub
+                        dl.set_create_cbk(c_this,stub)
+                if "open_fop" in funcs:
+                        @OpOpen.fop_type
+                        def stub (frame, this, loc, flags, fd,
+                                  xdata, s=self):
+                                return s.open_fop (frame, this, loc, flags,
+                                                   fd, xdata)
+                        self.stub_refs["open_fop"] = stub
+                        dl.set_open_fop(c_this,stub)
+                if "open_cbk" in funcs:
+                        @OpOpen.cbk_type
+                        def stub (frame, cookie, this, op_ret, op_errno, fd,
+                                  xdata, s=self):
+                                return s.open_cbk (frame, cookie, this,
+                                                   op_ret, op_errno, fd,
+                                                   xdata)
+                        self.stub_refs["open_cbk"] = stub
+                        dl.set_open_cbk(c_this,stub)
+                if "readv_fop" in funcs:
+                        @OpReadv.fop_type
+                        def stub (frame, this, fd, size, offset, flags,
+                                  xdata, s=self):
+                                return s.readv_fop (frame, this, fd, size,
+                                                    offset, flags, xdata)
+                        self.stub_refs["readv_fop"] = stub
+                        dl.set_readv_fop(c_this,stub)
+                if "readv_cbk" in funcs:
+                        @OpReadv.cbk_type
+                        def stub (frame, cookie, this, op_ret, op_errno,
+                                  vector, count, stbuf, iobref, xdata,
+                                  s=self):
+                                return s.readv_cbk (frame, cookie, this,
+                                                    op_ret, op_errno, vector,
+                                                    count, stbuf, iobref,
+                                                    xdata)
+                        self.stub_refs["readv_cbk"] = stub
+                        dl.set_readv_cbk(c_this,stub)
+                if "writev_fop" in funcs:
+                        @OpWritev.fop_type
+                        def stub (frame, this, fd, vector, count,
+                                  offset, flags, iobref, xdata, s=self):
+                                return s.writev_fop (frame, this, fd, vector,
+                                                     count, offset, flags,
+                                                     iobref, xdata)
+                        self.stub_refs["writev_fop"] = stub
+                        dl.set_writev_fop(c_this,stub)
+                if "writev_cbk" in funcs:
+                        @OpWritev.cbk_type
+                        def stub (frame, cookie, this, op_ret, op_errno,
+                                  prebuf, postbuf, xdata, s=self):
+                                return s.writev_cbk (frame, cookie, this,
+                                                     op_ret, op_errno, prebuf,
+                                                     postbuf, xdata)
+                        self.stub_refs["writev_cbk"] = stub
+                        dl.set_writev_cbk(c_this,stub)
+                if "opendir_fop" in funcs:
+                        @OpOpendir.fop_type
+                        def stub (frame, this, loc, fd, xdata, s=self):
+                                return s.opendir_fop (frame, this, loc, fd,
+                                                      xdata)
+                        self.stub_refs["opendir_fop"] = stub
+                        dl.set_opendir_fop(c_this,stub)
+                if "opendir_cbk" in funcs:
+                        @OpOpendir.cbk_type
+                        def stub (frame, cookie, this, op_ret, op_errno, fd,
+                                  xdata, s=self):
+                                return s.opendir_cbk(frame, cookie, this,
+                                                     op_ret, op_errno, fd,
+                                                     xdata)
+                        self.stub_refs["opendir_cbk"] = stub
+                        dl.set_opendir_cbk(c_this,stub)
+                if "readdir_fop" in funcs:
+                        @OpReaddir.fop_type
+                        def stub (frame, this, fd, size, offset, xdata, s=self):
+                                return s.readdir_fop (frame, this, fd, size,
+                                                      offset, xdata)
+                        self.stub_refs["readdir_fop"] = stub
+                        dl.set_readdir_fop(c_this,stub)
+                if "readdir_cbk" in funcs:
+                        @OpReaddir.cbk_type
+                        def stub (frame, cookie, this, op_ret, op_errno,
+                                  entries, xdata, s=self):
+                                return s.readdir_cbk(frame, cookie, this,
+                                                     op_ret, op_errno, entries,
+                                                     xdata)
+                        self.stub_refs["readdir_cbk"] = stub
+                        dl.set_readdir_cbk(c_this,stub)
+                if "readdirp_fop" in funcs:
+                        @OpReaddirp.fop_type
+                        def stub (frame, this, fd, size, offset, xdata, s=self):
+                                return s.readdirp_fop (frame, this, fd, size,
+                                                       offset, xdata)
+                        self.stub_refs["readdirp_fop"] = stub
+                        dl.set_readdirp_fop(c_this,stub)
+                if "readdirp_cbk" in funcs:
+                        @OpReaddirp.cbk_type
+                        def stub (frame, cookie, this, op_ret, op_errno,
+                                  entries, xdata, s=self):
+                                return s.readdirp_cbk (frame, cookie, this,
+                                                       op_ret, op_errno,
+                                                       entries, xdata)
+                        self.stub_refs["readdirp_cbk"] = stub
+                        dl.set_readdirp_cbk(c_this,stub)
+                if "stat_fop" in funcs:
+                        @OpStat.fop_type
+                        def stub (frame, this, loc, xdata, s=self):
+                                return s.stat_fop (frame, this, loc, xdata)
+                        self.stub_refs["stat_fop"] = stub
+                        dl.set_stat_fop(c_this,stub)
+                if "stat_cbk" in funcs:
+                        @OpStat.cbk_type
+                        def stub (frame, cookie, this, op_ret, op_errno, buf,
+                                  xdata, s=self):
+                                return s.stat_cbk(frame, cookie, this, op_ret,
+                                                  op_errno, buf, xdata)
+                        self.stub_refs["stat_cbk"] = stub
+                        dl.set_stat_cbk(c_this,stub)
+                if "fstat_fop" in funcs:
+                        @OpFstat.fop_type
+                        def stub (frame, this, fd, xdata, s=self):
+                                return s.fstat_fop (frame, this, fd, xdata)
+                        self.stub_refs["fstat_fop"] = stub
+                        dl.set_fstat_fop(c_this,stub)
+                if "fstat_cbk" in funcs:
+                        @OpFstat.cbk_type
+                        def stub (frame, cookie, this, op_ret, op_errno, buf,
+                                  xdata, s=self):
+                                return s.fstat_cbk(frame, cookie, this, op_ret,
+                                                   op_errno, buf, xdata)
+                        self.stub_refs["fstat_cbk"] = stub
+                        dl.set_fstat_cbk(c_this,stub)
+                if "statfs_fop" in funcs:
+                        @OpStatfs.fop_type
+                        def stub (frame, this, loc, xdata, s=self):
+                                return s.statfs_fop (frame, this, loc, xdata)
+                        self.stub_refs["statfs_fop"] = stub
+                        dl.set_statfs_fop(c_this,stub)
+                if "statfs_cbk" in funcs:
+                        @OpStatfs.cbk_type
+                        def stub (frame, cookie, this, op_ret, op_errno, buf,
+                                  xdata, s=self):
+                                return s.statfs_cbk (frame, cookie, this,
+                                                     op_ret, op_errno, buf,
+                                                     xdata)
+                        self.stub_refs["statfs_cbk"] = stub
+                        dl.set_statfs_cbk(c_this,stub)
+                if "setxattr_fop" in funcs:
+                        @OpSetxattr.fop_type
+                        def stub (frame, this, loc, dictionary, flags, xdata,
+                                  s=self):
+                                return s.setxattr_fop (frame, this, loc,
+                                                       dictionary, flags,
+                                                       xdata)
+                        self.stub_refs["setxattr_fop"] = stub
+                        dl.set_setxattr_fop(c_this,stub)
+                if "setxattr_cbk" in funcs:
+                        @OpSetxattr.cbk_type
+                        def stub (frame, cookie, this, op_ret, op_errno, xdata,
+                                  s=self):
+                                return s.setxattr_cbk(frame, cookie, this,
+                                                      op_ret, op_errno, xdata)
+                        self.stub_refs["setxattr_cbk"] = stub
+                        dl.set_setxattr_cbk(c_this,stub)
+                if "getxattr_fop" in funcs:
+                        @OpGetxattr.fop_type
+                        def stub (frame, this, loc, name, xdata, s=self):
+                                return s.getxattr_fop (frame, this, loc, name,
+                                                       xdata)
+                        self.stub_refs["getxattr_fop"] = stub
+                        dl.set_getxattr_fop(c_this,stub)
+                if "getxattr_cbk" in funcs:
+                        @OpGetxattr.cbk_type
+                        def stub (frame, cookie, this, op_ret, op_errno,
+                                  dictionary, xdata, s=self):
+                                return s.getxattr_cbk(frame, cookie, this,
+                                                      op_ret, op_errno,
+                                                      dictionary, xdata)
+                        self.stub_refs["getxattr_cbk"] = stub
+                        dl.set_getxattr_cbk(c_this,stub)
+                if "fsetxattr_fop" in funcs:
+                        @OpFsetxattr.fop_type
+                        def stub (frame, this, fd, dictionary, flags, xdata,
+                                  s=self):
+                                return s.fsetxattr_fop (frame, this, fd,
+                                                        dictionary, flags,
+                                                        xdata)
+                        self.stub_refs["fsetxattr_fop"] = stub
+                        dl.set_fsetxattr_fop(c_this,stub)
+                if "fsetxattr_cbk" in funcs:
+                        @OpFsetxattr.cbk_type
+                        def stub (frame, cookie, this, op_ret, op_errno, xdata,
+                                  s=self):
+                                return s.fsetxattr_cbk(frame, cookie, this,
+                                                       op_ret, op_errno, xdata)
+                        self.stub_refs["fsetxattr_cbk"] = stub
+                        dl.set_fsetxattr_cbk(c_this,stub)
+                if "fgetxattr_fop" in funcs:
+                        @OpFgetxattr.fop_type
+                        def stub (frame, this, fd, name, xdata, s=self):
+                                return s.fgetxattr_fop (frame, this, fd, name,
+                                                        xdata)
+                        self.stub_refs["fgetxattr_fop"] = stub
+                        dl.set_fgetxattr_fop(c_this,stub)
+                if "fgetxattr_cbk" in funcs:
+                        @OpFgetxattr.cbk_type
+                        def stub (frame, cookie, this, op_ret, op_errno,
+                                  dictionary, xdata, s=self):
+                                return s.fgetxattr_cbk(frame, cookie, this,
+                                                       op_ret, op_errno,
+                                                       dictionary, xdata)
+                        self.stub_refs["fgetxattr_cbk"] = stub
+                        dl.set_fgetxattr_cbk(c_this,stub)
+                if "removexattr_fop" in funcs:
+                        @OpRemovexattr.fop_type
+                        def stub (frame, this, loc, name, xdata, s=self):
+                                return s.removexattr_fop (frame, this, loc,
+                                                          name, xdata)
+                        self.stub_refs["removexattr_fop"] = stub
+                        dl.set_removexattr_fop(c_this,stub)
+                if "removexattr_cbk" in funcs:
+                        @OpRemovexattr.cbk_type
+                        def stub (frame, cookie, this, op_ret, op_errno,
+                                  xdata, s=self):
+                                return s.removexattr_cbk(frame, cookie, this,
+                                                         op_ret, op_errno,
+                                                         xdata)
+                        self.stub_refs["removexattr_cbk"] = stub
+                        dl.set_removexattr_cbk(c_this,stub)
+                if "fremovexattr_fop" in funcs:
+                        @OpFremovexattr.fop_type
+                        def stub (frame, this, fd, name, xdata, s=self):
+                                return s.fremovexattr_fop (frame, this, fd,
+                                                           name, xdata)
+                        self.stub_refs["fremovexattr_fop"] = stub
+                        dl.set_fremovexattr_fop(c_this,stub)
+                if "fremovexattr_cbk" in funcs:
+                        @OpFremovexattr.cbk_type
+                        def stub (frame, cookie, this, op_ret, op_errno,
+                                  xdata, s=self):
+                                return s.fremovexattr_cbk(frame, cookie, this,
+                                                          op_ret, op_errno,
+                                                          xdata)
+                        self.stub_refs["fremovexattr_cbk"] = stub
+                        dl.set_fremovexattr_cbk(c_this,stub)
+                if "link_fop" in funcs:
+                        @OpLink.fop_type
+                        def stub (frame, this, oldloc, newloc,
+                                  xdata, s=self):
+                                return s.link_fop (frame, this, oldloc,
+                                                   newloc, xdata)
+                        self.stub_refs["link_fop"] = stub
+                        dl.set_link_fop(c_this,stub)
+                if "link_cbk" in funcs:
+                        @OpLink.cbk_type
+                        def stub (frame, cookie, this, op_ret, op_errno,
+                                  inode, buf, preparent, postparent, xdata,
+                                  s=self):
+                                return s.link_cbk (frame, cookie, this,
+                                                   op_ret, op_errno, inode,
+                                                   buf, preparent,
+                                                   postparent, xdata)
+                        self.stub_refs["link_cbk"] = stub
+                        dl.set_link_cbk(c_this,stub)
+                if "symlink_fop" in funcs:
+                        @OpSymlink.fop_type
+                        def stub (frame, this, linkname, loc,
+                                  umask, xdata, s=self):
+                                return s.symlink_fop (frame, this, linkname,
+                                                      loc, umask, xdata)
+                        self.stub_refs["symlink_fop"] = stub
+                        dl.set_symlink_fop(c_this,stub)
+                if "symlink_cbk" in funcs:
+                        @OpSymlink.cbk_type
+                        def stub (frame, cookie, this, op_ret, op_errno,
+                                  inode, buf, preparent, postparent, xdata,
+                                  s=self):
+                                return s.symlink_cbk (frame, cookie, this,
+                                                      op_ret, op_errno, inode,
+                                                      buf, preparent,
+                                                      postparent, xdata)
+                        self.stub_refs["symlink_cbk"] = stub
+                        dl.set_symlink_cbk(c_this,stub)
+                if "unlink_fop" in funcs:
+                        @OpUnlink.fop_type
+                        def stub (frame, this, loc, xflags,
+                                  xdata, s=self):
+                                return s.unlink_fop (frame, this, loc,
+                                                     xflags, xdata)
+                        self.stub_refs["unlink_fop"] = stub
+                        dl.set_unlink_fop(c_this,stub)
+                if "unlink_cbk" in funcs:
+                        @OpUnlink.cbk_type
+                        def stub (frame, cookie, this, op_ret, op_errno,
+                                  preparent, postparent, xdata, s=self):
+                                return s.unlink_cbk (frame, cookie, this,
+                                                     op_ret, op_errno,
+                                                     preparent, postparent,
+                                                     xdata)
+                        self.stub_refs["unlink_cbk"] = stub
+                        dl.set_unlink_cbk(c_this,stub)
+                if "readlink_fop" in funcs:
+                        @OpReadlink.fop_type
+                        def stub (frame, this, loc, size,
+                                  xdata, s=self):
+                                return s.readlink_fop (frame, this, loc,
+                                                       size, xdata)
+                        self.stub_refs["readlink_fop"] = stub
+                        dl.set_readlink_fop(c_this,stub)
+                if "readlink_cbk" in funcs:
+                        @OpReadlink.cbk_type
+                        def stub (frame, cookie, this, op_ret, op_errno,
+                                  path, buf, xdata, s=self):
+                                return s.readlink_cbk (frame, cookie, this,
+                                                       op_ret, op_errno,
+                                                       path, buf, xdata)
+                        self.stub_refs["readlink_cbk"] = stub
+                        dl.set_readlink_cbk(c_this,stub)
+                if "mkdir_fop" in funcs:
+                        @OpMkdir.fop_type
+                        def stub (frame, this, loc, mode, umask, xdata,
+                                  s=self):
+                                return s.mkdir_fop (frame, this, loc, mode,
+                                                    umask, xdata)
+                        self.stub_refs["mkdir_fop"] = stub
+                        dl.set_mkdir_fop(c_this,stub)
+                if "mkdir_cbk" in funcs:
+                        @OpMkdir.cbk_type
+                        def stub (frame, cookie, this, op_ret, op_errno, inode,
+                                  buf, preparent, postparent, xdata, s=self):
+                                return s.mkdir_cbk (frame, cookie, this,
+                                                    op_ret, op_errno, inode,
+                                                    buf, preparent,
+                                                    postparent, xdata)
+                        self.stub_refs["mkdir_cbk"] = stub
+                        dl.set_mkdir_cbk(c_this,stub)
+                if "rmdir_fop" in funcs:
+                        @OpRmdir.fop_type
+                        def stub (frame, this, loc, xflags,
+                                  xdata, s=self):
+                                return s.rmdir_fop (frame, this, loc,
+                                                    xflags, xdata)
+                        self.stub_refs["rmdir_fop"] = stub
+                        dl.set_rmdir_fop(c_this,stub)
+                if "rmdir_cbk" in funcs:
+                        @OpRmdir.cbk_type
+                        def stub (frame, cookie, this, op_ret, op_errno,
+                                  preparent, postparent, xdata, s=self):
+                                return s.rmdir_cbk (frame, cookie, this,
+                                                    op_ret, op_errno,
+                                                    preparent, postparent,
+                                                    xdata)
+                        self.stub_refs["rmdir_cbk"] = stub
+                        dl.set_rmdir_cbk(c_this,stub)
diff --git a/xlators/features/glupy/src/helloworld.py b/xlators/features/glupy/src/helloworld.py
new file mode 100644
index 000000000..8fe403711
--- /dev/null
+++ b/xlators/features/glupy/src/helloworld.py
@@ -0,0 +1,19 @@
+import sys
+from gluster import *
+
+class xlator (Translator):
+
+    def __init__(self, c_this):
+        Translator.__init__(self, c_this)
+
+    def lookup_fop(self, frame, this, loc, xdata):
+        print "Python xlator: Hello!"
+        dl.wind_lookup(frame, POINTER(xlator_t)(), loc, xdata)
+        return 0
+
+    def lookup_cbk(self, frame, cookie, this, op_ret, op_errno, inode, buf,
+                   xdata, postparent):
+        print "Python xlator: Hello again!"
+        dl.unwind_lookup(frame, cookie, this, op_ret, op_errno, inode, buf,
+                         xdata, postparent)
+        return 0
diff --git a/xlators/features/glupy/src/negative.py b/xlators/features/glupy/src/negative.py
new file mode 100644
index 000000000..1023602b9
--- /dev/null
+++ b/xlators/features/glupy/src/negative.py
@@ -0,0 +1,92 @@
+import sys
+from uuid import UUID
+from gluster import *
+
+# Negative-lookup-caching example.  If a file wasn't there the last time we
+# looked, it's probably still not there.  This translator keeps track of
+# those failed lookups for us, and returns ENOENT without needing to pass the
+# call any further for repeated requests.
+
+# If we were doing this for real, we'd need separate caches for each xlator
+# instance.  The easiest way to do this would be to have xlator.__init__
+# "register" each instance in a module-global dict, with the key as the C
+# translator address and the value as the xlator object itself.  For testing
+# and teaching, it's sufficient just to have one cache.  The keys are parent
+# GFIDs, and the entries are lists of names within that parent that we know
+# don't exist.
+cache = {}
+
+# TBD: we need a better way of handling per-request data (frame->local in C).
+dl.get_id.restype = c_long
+dl.get_id.argtypes = [ POINTER(call_frame_t) ]
+
+def uuid2str (gfid):
+    return str(UUID(''.join(map("{0:02x}".format, gfid))))
+
+class xlator (Translator):
+
+    def __init__ (self, c_this):
+        self.requests = {}
+        Translator.__init__(self,c_this)
+
+    def lookup_fop (self, frame, this, loc, xdata):
+        pargfid = uuid2str(loc.contents.pargfid)
+        print "lookup FOP: %s:%s" % (pargfid, loc.contents.name)
+        # Check the cache.
+        if cache.has_key(pargfid):
+            if loc.contents.name in cache[pargfid]:
+                print "short-circuiting for %s:%s" % (pargfid,
+                    loc.contents.name)
+                dl.unwind_lookup(frame,0,this,-1,2,None,None,None,None)
+                return 0
+        key = dl.get_id(frame)
+        self.requests[key] = (pargfid, loc.contents.name[:])
+        # TBD: get real child xl from init, pass it here
+        dl.wind_lookup(frame,POINTER(xlator_t)(),loc,xdata)
+        return 0
+
+    def lookup_cbk (self, frame, cookie, this, op_ret, op_errno, inode, buf,
+                    xdata, postparent):
+        print "lookup CBK: %d (%d)" % (op_ret, op_errno)
+        key = dl.get_id(frame)
+        pargfid, name = self.requests[key]
+        # Update the cache.
+        if op_ret == 0:
+            print "found %s, removing from cache" % name
+            if cache.has_key(pargfid):
+                cache[pargfid].discard(name)
+        elif op_errno == 2:    # ENOENT
+            print "failed to find %s, adding to cache" % name
+            if cache.has_key(pargfid):
+                cache[pargfid].add(name)
+            else:
+                cache[pargfid] = set([name])
+        del self.requests[key]
+        dl.unwind_lookup(frame,cookie,this,op_ret,op_errno,
+                         inode,buf,xdata,postparent)
+        return 0
+
+    def create_fop (self, frame, this, loc, flags, mode, umask, fd, xdata):
+        pargfid = uuid2str(loc.contents.pargfid)
+        print "create FOP: %s:%s" % (pargfid, loc.contents.name)
+        key = dl.get_id(frame)
+        self.requests[key] = (pargfid, loc.contents.name[:])
+        # TBD: get real child xl from init, pass it here
+        dl.wind_create(frame,POINTER(xlator_t)(),loc,flags,mode,umask,fd,xdata)
+        return 0
+
+    def create_cbk (self, frame, cookie, this, op_ret, op_errno, fd, inode,
+                    buf, preparent, postparent, xdata):
+        print "create CBK: %d (%d)" % (op_ret, op_errno)
+        key = dl.get_id(frame)
+        pargfid, name = self.requests[key]
+        # Update the cache.
+        if op_ret == 0:
+            print "created %s, removing from cache" % name
+            if cache.has_key(pargfid):
+                cache[pargfid].discard(name)
+        del self.requests[key]
+        dl.unwind_create(frame,cookie,this,op_ret,op_errno,fd,inode,buf,
+                         preparent,postparent,xdata)
+        return 0
+
diff --git a/xlators/features/index/src/index.c b/xlators/features/index/src/index.c
index 3245076ec..9253120f3 100644
--- a/xlators/features/index/src/index.c
+++ b/xlators/features/index/src/index.c
@@ -15,8 +15,10 @@
 #include "index.h"
 #include "options.h"
 #include "glusterfs3-xdr.h"
+#include "syncop.h"
 
 #define XATTROP_SUBDIR "xattrop"
+#define BASE_INDICES_HOLDER_SUBDIR "base_indices_holder"
 
 call_stub_t *
 __index_dequeue (struct list_head *callstubs)
@@ -242,20 +244,40 @@ check_delete_stale_index_file (xlator_t *this, char *filename)
 {
         int             ret = 0;
         struct stat     st = {0};
+        struct stat     base_index_st = {0};
         char            filepath[PATH_MAX] = {0};
+        char            filepath_under_base_indices_holder[PATH_MAX] = {0};
         index_priv_t    *priv = NULL;
 
         priv = this->private;
+        if (priv->to_be_healed_states != synced_state)
+                return;
+
         make_file_path (priv->index_basepath, XATTROP_SUBDIR,
                         filename, filepath, sizeof (filepath));
+
+        make_file_path (priv->index_basepath, BASE_INDICES_HOLDER_SUBDIR,
+                        filename, filepath_under_base_indices_holder,
+                        sizeof (filepath_under_base_indices_holder));
+
+
+        ret = stat (filepath_under_base_indices_holder, &base_index_st);
+        if (ret) {
+                gf_log (THIS->name, GF_LOG_ERROR, "Base index is not created"
+                        "under index/base_indices_holder");
+                return;
+        }
+
         ret = stat (filepath, &st);
-        if (!ret && st.st_nlink == 1)
+        if (!ret && st.st_nlink == 2) {
                 unlink (filepath);
+                unlink (filepath_under_base_indices_holder);
+        }
 }
 
 static int
 index_fill_readdir (fd_t *fd, DIR *dir, off_t off,
-                    size_t size, gf_dirent_t *entries)
+                    size_t size, gf_dirent_t *entries, readdir_directory type)
 {
         off_t     in_case = -1;
         size_t    filled = 0;
@@ -298,7 +320,8 @@ index_fill_readdir (fd_t *fd, DIR *dir, off_t off,
                 }
 
                 if (!strncmp (entry->d_name, XATTROP_SUBDIR"-",
-                              strlen (XATTROP_SUBDIR"-"))) {
+                              strlen (XATTROP_SUBDIR"-")) &&
+                              (type == INDEX_XATTROP)) {
                         check_delete_stale_index_file (this, entry->d_name);
                         continue;
                 }
@@ -337,16 +360,175 @@ out:
 }
 
 int
+sync_base_indices (void *index_priv)
+{
+        index_priv_t    *priv = NULL;
+        DIR             *dir_base_holder  = NULL;
+        DIR             *xattrop_dir = NULL;
+        struct dirent   *entry = NULL;
+        char            base_indices_holder[PATH_MAX] = {0};
+        char            xattrop_directory[PATH_MAX] = {0};
+        char            base_index_path[PATH_MAX] = {0};
+        char            xattrop_index_path[PATH_MAX] = {0};
+        int             ret = 0;
+
+        priv = index_priv;
+
+        snprintf (base_indices_holder, PATH_MAX, "%s/%s", priv->index_basepath,
+                  BASE_INDICES_HOLDER_SUBDIR);
+        snprintf (xattrop_directory, PATH_MAX, "%s/%s", priv->index_basepath,
+                  XATTROP_SUBDIR);
+
+        if ((dir_base_holder = opendir(base_indices_holder)) == NULL) {
+                ret = -1;
+                goto out;
+        }
+        if ((xattrop_dir = opendir (xattrop_directory)) == NULL) {
+                ret = -1;
+                goto out;
+        }
+
+        priv->to_be_healed_states = sync_started;
+        while ((entry = readdir(xattrop_dir)) != NULL) {
+                if (!strcmp (entry->d_name, ".") ||
+                    !strcmp (entry->d_name, "..")) {
+                        continue;
+                }
+                if (strncmp (entry->d_name, XATTROP_SUBDIR"-",
+                    strlen (XATTROP_SUBDIR"-"))) {
+                        continue;
+                }
+                if (!strncmp (entry->d_name, XATTROP_SUBDIR"-",
+                    strlen (XATTROP_SUBDIR"-"))) {
+
+                    snprintf (xattrop_index_path, PATH_MAX, "%s/%s",
+                              xattrop_directory, entry->d_name);
+
+                    snprintf (base_index_path, PATH_MAX, "%s/%s",
+                              base_indices_holder, entry->d_name);
+
+                    ret = link (xattrop_index_path, base_index_path);
+                    if (ret && errno != EEXIST)
+                        goto out;
+
+                }
+        }
+        ret = closedir (xattrop_dir);
+        if (ret)
+                goto out;
+        ret = closedir (dir_base_holder);
+        if (ret)
+                goto out;
+
+        ret = 0;
+out:
+        return ret;
+
+}
+
+int
+base_indices_syncing_done (int ret, call_frame_t *frame, void *data)
+{
+        index_priv_t         *priv = NULL;
+        priv = data;
+
+        if (!priv)
+                goto out;
+
+        if (ret) {
+                priv->to_be_healed_states = sync_not_started;
+        } else {
+                priv->to_be_healed_states = synced_state;
+        }
+
+        STACK_DESTROY (frame->root);
+
+out:
+        return 0;
+}
+
+int
+sync_base_indices_from_xattrop (xlator_t *this)
+{
+
+        index_priv_t          *priv = NULL;
+        char                  base_indices_holder[PATH_MAX] =  {0};
+        int                   ret = 0;
+        struct stat           st = {0};
+        DIR                   *dir = NULL;
+        struct dirent         *entry = NULL;
+        call_frame_t          *frame = NULL;
+
+        priv = this->private;
+
+        if (priv->to_be_healed_states != sync_not_started) {
+                ret = -1;
+                goto out;
+        }
+
+        snprintf (base_indices_holder, PATH_MAX, "%s/%s", priv->index_basepath,
+                  BASE_INDICES_HOLDER_SUBDIR);
+
+        ret = stat (base_indices_holder, &st);
+
+        if (ret && (errno != ENOENT)) {
+                goto out;
+        } else if (errno == ENOENT) {
+                ret = index_dir_create (this, BASE_INDICES_HOLDER_SUBDIR);
+                if (ret)
+                        goto out;
+        } else {
+                if ((dir = opendir (base_indices_holder)) == NULL) {
+                        ret = -1;
+                        goto out;
+                }
+                while ((entry = readdir (dir)) != NULL) {
+                        if (!strcmp (entry->d_name, ".") ||
+                            !strcmp (entry->d_name,"..")) {
+                                continue;
+                        }
+                        ret = unlink (entry->d_name);
+                        if (ret)
+                                goto out;
+                }
+                closedir (dir);
+        }
+
+        /*At this point of time we have index/base_indicies_holder directory
+         *is with no entries*/
+
+        frame = create_frame (this, this->ctx->pool);
+        if (!frame) {
+                ret = -1;
+                goto out;
+        }
+        set_lk_owner_from_ptr (&frame->root->lk_owner, frame->root);
+
+        frame->root->pid = LOW_PRIO_PROC_PID;
+
+        ret = synctask_new (this->ctx->env, sync_base_indices,
+                            base_indices_syncing_done,frame, priv);
+
+
+
+out:
+        return ret;
+
+}
+
+int
 index_add (xlator_t *this, uuid_t gfid, const char *subdir)
 {
         int32_t           op_errno = 0;
         char              gfid_path[PATH_MAX] = {0};
         char              index_path[PATH_MAX] = {0};
+        char              base_path[PATH_MAX] = {0};
         int               ret = 0;
         uuid_t            index = {0};
         index_priv_t      *priv = NULL;
         struct stat       st = {0};
         int               fd = 0;
+        int               index_created = 0;
 
         priv = this->private;
         GF_ASSERT_AND_GOTO_WITH_ERROR (this->name, !uuid_is_null (gfid),
@@ -364,9 +546,11 @@ index_add (xlator_t *this, uuid_t gfid, const char *subdir)
         ret = link (index_path, gfid_path);
         if (!ret || (errno == EEXIST))  {
                 ret = 0;
+                index_created = 1;
                 goto out;
         }
 
+
         op_errno = errno;
         if (op_errno == ENOENT) {
                 ret = index_dir_create (this, subdir);
@@ -398,10 +582,36 @@ index_add (xlator_t *this, uuid_t gfid, const char *subdir)
                         "add to index (%s)", uuid_utoa (gfid),
                         strerror (errno));
                 goto out;
+        } else {
+                index_created = 1;
+        }
+
+        if (priv->to_be_healed_states != sync_not_started) {
+                 make_index_path (priv->index_basepath,
+                                  GF_BASE_INDICES_HOLDER_GFID,
+                                  index, base_path, sizeof (base_path));
+                 ret = link (index_path, base_path);
+                 if (ret)
+                         goto out;
         }
 
         ret = 0;
 out:
+        /*If base_indices_holder is not created: create and sync
+         *If directory is present: delete contents and start syncing
+         *If syncing is in progress :No need to do any thing
+         *If syncing is done: No need to do anything*/
+        if (!ret) {
+                switch (priv->to_be_healed_states) {
+                        case sync_not_started:
+                                ret = sync_base_indices_from_xattrop (this);
+                                break;
+                        case sync_started:
+                        case synced_state:
+                                /*No need to do anything*/
+                                break;
+                }
+        }
         return ret;
 }
 
@@ -737,8 +947,18 @@ index_getxattr_wrapper (call_frame_t *frame, xlator_t *this,
                 goto done;
         }
 
-        ret = dict_set_static_bin (xattr, (char*)name, priv->xattrop_vgfid,
-                                   sizeof (priv->xattrop_vgfid));
+        if (!strcmp (name, GF_XATTROP_INDEX_GFID)) {
+
+                ret = dict_set_static_bin (xattr, (char*)name,
+                                           priv->xattrop_vgfid,
+                                           sizeof (priv->xattrop_vgfid));
+
+        } else if (!strcmp (name, GF_BASE_INDICES_HOLDER_GFID)) {
+
+                ret = dict_set_static_bin (xattr, (char*)name,
+                                           priv->base_indices_holder_vgfid,
+                                      sizeof (priv->base_indices_holder_vgfid));
+        }
         if (ret) {
                 ret = -ENOMEM;
                 gf_log (THIS->name, GF_LOG_ERROR, "xattrop index "
@@ -782,6 +1002,15 @@ index_lookup_wrapper (call_frame_t *frame, xlator_t *this,
         } else if (!uuid_compare (loc->pargfid, priv->xattrop_vgfid)) {
                 make_file_path (priv->index_basepath, XATTROP_SUBDIR,
                                 loc->name, path, sizeof (path));
+        } else if (!uuid_compare (loc->gfid,priv->base_indices_holder_vgfid)){
+                make_index_dir_path (priv->index_basepath,
+                                     BASE_INDICES_HOLDER_SUBDIR, path,
+                                    sizeof (path));
+                is_dir = _gf_true;
+        } else if (!uuid_compare (loc->pargfid, priv->base_indices_holder_vgfid)) {
+                make_file_path (priv->index_basepath,
+                                BASE_INDICES_HOLDER_SUBDIR,loc->name, path,
+                                sizeof (path));
         }
 
         ret = lstat (path, &lstatbuf);
@@ -803,10 +1032,14 @@ index_lookup_wrapper (call_frame_t *frame, xlator_t *this,
         }
 
         iatt_from_stat (&stbuf, &lstatbuf);
-        if (is_dir)
+        if (is_dir && !uuid_compare (loc->gfid, priv->xattrop_vgfid)) {
                 uuid_copy (stbuf.ia_gfid, priv->xattrop_vgfid);
-        else
+        } else if (is_dir &&
+                !uuid_compare (loc->gfid, priv->base_indices_holder_vgfid)) {
+                uuid_copy (stbuf.ia_gfid, priv->base_indices_holder_vgfid);
+        } else {
                 uuid_generate (stbuf.ia_gfid);
+        }
         stbuf.ia_ino = -1;
         op_ret = 0;
 done:
@@ -818,6 +1051,44 @@ done:
 }
 
 int32_t
+base_indices_readdir_wrapper (call_frame_t *frame, xlator_t *this,
+                              fd_t *fd, size_t size, off_t off, dict_t *xdata)
+{
+        index_priv_t    *priv = NULL;
+        char            base_indices_holder[PATH_MAX] = {0};
+        DIR             *dir = NULL;
+        int32_t         op_ret = -1;
+        int32_t         op_errno = 0;
+        int             count = 0;
+        gf_dirent_t     entries;
+
+        priv = this->private;
+
+        make_index_dir_path (priv->index_basepath, BASE_INDICES_HOLDER_SUBDIR,
+                             base_indices_holder, sizeof (base_indices_holder));
+
+        dir = opendir (base_indices_holder);
+        if (!dir) {
+                op_errno = EINVAL;
+                goto done;
+        }
+
+
+        INIT_LIST_HEAD (&entries.list);
+
+        count = index_fill_readdir (fd, dir, off, size, &entries,
+                                    BASE_INDICES_HOLDER);
+        /* pick ENOENT to indicate EOF */
+        op_errno = errno;
+        op_ret = count;
+        closedir (dir);
+done:
+        STACK_UNWIND_STRICT (readdir, frame, op_ret, op_errno, &entries, xdata);
+        gf_dirent_free (&entries);
+        return 0;
+}
+
+int32_t
 index_readdir_wrapper (call_frame_t *frame, xlator_t *this,
                        fd_t *fd, size_t size, off_t off, dict_t *xdata)
 {
@@ -848,7 +1119,8 @@ index_readdir_wrapper (call_frame_t *frame, xlator_t *this,
                 goto done;
         }
 
-        count = index_fill_readdir (fd, dir, off, size, &entries);
+        count = index_fill_readdir (fd, dir, off, size, &entries,
+                                    INDEX_XATTROP);
 
         /* pick ENOENT to indicate EOF */
         op_errno = errno;
@@ -915,7 +1187,10 @@ index_getxattr (call_frame_t *frame, xlator_t *this,
 {
         call_stub_t     *stub = NULL;
 
-        if (!name || strcmp (GF_XATTROP_INDEX_GFID, name))
+        if (!name)
+                goto out;
+        if (strcmp (GF_XATTROP_INDEX_GFID, name) &&
+            strcmp (GF_BASE_INDICES_HOLDER_GFID, name))
                 goto out;
 
         stub = fop_getxattr_stub (frame, index_getxattr_wrapper, loc, name,
@@ -942,7 +1217,9 @@ index_lookup (call_frame_t *frame, xlator_t *this,
         priv = this->private;
 
         if (uuid_compare (loc->gfid, priv->xattrop_vgfid) &&
-            uuid_compare (loc->pargfid, priv->xattrop_vgfid))
+            uuid_compare (loc->pargfid, priv->xattrop_vgfid) &&
+            uuid_compare (loc->gfid, priv->base_indices_holder_vgfid) &&
+            uuid_compare (loc->pargfid, priv->base_indices_holder_vgfid))
                 goto normal;
 
         stub = fop_lookup_stub (frame, index_lookup_wrapper, loc, xattr_req);
@@ -968,10 +1245,19 @@ index_readdir (call_frame_t *frame, xlator_t *this,
         index_priv_t    *priv = NULL;
 
         priv = this->private;
-        if (uuid_compare (fd->inode->gfid, priv->xattrop_vgfid))
+        if (uuid_compare (fd->inode->gfid, priv->xattrop_vgfid) &&
+            uuid_compare (fd->inode->gfid, priv->base_indices_holder_vgfid))
                 goto out;
-        stub = fop_readdir_stub (frame, index_readdir_wrapper, fd, size, off,
-                                 xdata);
+
+        if (!uuid_compare (fd->inode->gfid, priv->xattrop_vgfid)) {
+                stub = fop_readdir_stub (frame, index_readdir_wrapper, fd, size, 
+                                         off, xdata);
+        } else if (!uuid_compare (fd->inode->gfid,
+                                  priv->base_indices_holder_vgfid)) {
+                stub = fop_readdir_stub (frame, base_indices_readdir_wrapper,
+                                         fd, size, off, xdata);
+        }
+
         if (!stub) {
                 STACK_UNWIND_STRICT (readdir, frame, -1, ENOMEM, NULL, NULL);
                 return 0;
@@ -1075,10 +1361,13 @@ init (xlator_t *this)
         GF_OPTION_INIT ("index-base", priv->index_basepath, path, out);
         uuid_generate (priv->index);
         uuid_generate (priv->xattrop_vgfid);
+        /*base_indices_holder is a directory which contains hard links to
+         * all base indices inside indices/xattrop directory*/
+        uuid_generate (priv->base_indices_holder_vgfid);
         INIT_LIST_HEAD (&priv->callstubs);
 
         this->private = priv;
-        ret = pthread_create (&thread, &w_attr, index_worker, this);
+        ret = gf_thread_create (&thread, &w_attr, index_worker, this);
         if (ret) {
                 gf_log (this->name, GF_LOG_WARNING, "Failed to create "
                         "worker thread, aborting");
diff --git a/xlators/features/index/src/index.h b/xlators/features/index/src/index.h
index 661dcdbc4..d6dcb1c23 100644
--- a/xlators/features/index/src/index.h
+++ b/xlators/features/index/src/index.h
@@ -36,14 +36,28 @@ typedef struct index_fd_ctx {
         DIR *dir;
 } index_fd_ctx_t;
 
+typedef enum {
+        sync_not_started,
+        sync_started,
+        synced_state,
+} to_be_healed_states_t;
+
+typedef enum {
+        INDEX_XATTROP,
+        BASE_INDICES_HOLDER,
+} readdir_directory;
+
 typedef struct index_priv {
         char *index_basepath;
         uuid_t index;
         gf_lock_t lock;
         uuid_t xattrop_vgfid;//virtual gfid of the xattrop index dir
+        uuid_t base_indices_holder_vgfid; //virtual gfid of the
+                                          //to_be_healed_xattrop directory
         struct list_head callstubs;
         pthread_mutex_t mutex;
         pthread_cond_t  cond;
+        to_be_healed_states_t to_be_healed_states;
 } index_priv_t;
 
 #define INDEX_STACK_UNWIND(fop, frame, params ...)      \
diff --git a/xlators/features/locks/src/Makefile.am b/xlators/features/locks/src/Makefile.am
index 8908c1f52..0f79731b4 100644
--- a/xlators/features/locks/src/Makefile.am
+++ b/xlators/features/locks/src/Makefile.am
@@ -11,6 +11,7 @@ noinst_HEADERS = locks.h common.h locks-mem-types.h clear.h
 
 AM_CPPFLAGS = $(GF_CPPFLAGS) -I$(top_srcdir)/libglusterfs/src
 
+
 AM_CFLAGS = -Wall -fno-strict-aliasing $(GF_CFLAGS)
 
 CLEANFILES = 
diff --git a/xlators/features/locks/src/clear.c b/xlators/features/locks/src/clear.c
index 5790a99ce..124b9ad0f 100644
--- a/xlators/features/locks/src/clear.c
+++ b/xlators/features/locks/src/clear.c
@@ -339,6 +339,7 @@ blkd:
                                    -1, EAGAIN);
                 STACK_UNWIND_STRICT (entrylk, elock->frame, -1, EAGAIN, NULL);
                 GF_FREE ((char *) elock->basename);
+                GF_FREE (elock->connection_id);
                 GF_FREE (elock);
         }
 
@@ -379,8 +380,8 @@ out:
 
 int
 clrlk_clear_lks_in_all_domains (xlator_t *this, pl_inode_t *pl_inode,
-                          clrlk_args *args, int *blkd, int *granted,
-                          int *op_errno)
+                                clrlk_args *args, int *blkd, int *granted,
+                                int *op_errno)
 {
         pl_dom_list_t   *dom            = NULL;
         int             ret             = -1;
diff --git a/xlators/features/locks/src/common.c b/xlators/features/locks/src/common.c
index 9c21bddb9..b3309580d 100644
--- a/xlators/features/locks/src/common.c
+++ b/xlators/features/locks/src/common.c
@@ -35,6 +35,7 @@ __insert_and_merge (pl_inode_t *pl_inode, posix_lock_t *lock);
 static int
 pl_send_prelock_unlock (xlator_t *this, pl_inode_t *pl_inode,
                         posix_lock_t *old_lock);
+
 static pl_dom_list_t *
 __allocate_domain (const char *volume)
 {
@@ -75,8 +76,8 @@ get_domain (pl_inode_t *pl_inode, const char *volume)
 {
         pl_dom_list_t *dom = NULL;
 
-        GF_VALIDATE_OR_GOTO (POSIX_LOCKS, pl_inode, out);
-        GF_VALIDATE_OR_GOTO (POSIX_LOCKS, volume, out);
+        GF_VALIDATE_OR_GOTO ("posix-locks", pl_inode, out);
+        GF_VALIDATE_OR_GOTO ("posix-locks", volume, out);
 
         pthread_mutex_lock (&pl_inode->mutex);
         {
@@ -92,9 +93,9 @@ get_domain (pl_inode_t *pl_inode, const char *volume)
 unlock:
         pthread_mutex_unlock (&pl_inode->mutex);
         if (dom) {
-                gf_log (POSIX_LOCKS, GF_LOG_TRACE, "Domain %s found", volume);
+                gf_log ("posix-locks", GF_LOG_TRACE, "Domain %s found", volume);
         } else {
-                gf_log (POSIX_LOCKS, GF_LOG_TRACE, "Domain %s not found", volume);
+                gf_log ("posix-locks", GF_LOG_TRACE, "Domain %s not found", volume);
         }
 out:
         return dom;
@@ -135,10 +136,10 @@ __pl_inode_is_empty (pl_inode_t *pl_inode)
 void
 pl_print_locker (char *str, int size, xlator_t *this, call_frame_t *frame)
 {
-        snprintf (str, size, "Pid=%llu, lk-owner=%s, Transport=%p, Frame=%llu",
+        snprintf (str, size, "Pid=%llu, lk-owner=%s, Client=%p, Frame=%llu",
                   (unsigned long long) frame->root->pid,
                   lkowner_utoa (&frame->root->lk_owner),
-                  (void *)frame->root->trans,
+                  frame->root->client,
                   (unsigned long long) frame->root->unique);
 }
 
@@ -462,14 +463,14 @@ unlock:
 
 /* Create a new posix_lock_t */
 posix_lock_t *
-new_posix_lock (struct gf_flock *flock, void *transport, pid_t client_pid,
+new_posix_lock (struct gf_flock *flock, client_t *client, pid_t client_pid,
                 gf_lkowner_t *owner, fd_t *fd)
 {
         posix_lock_t *lock = NULL;
 
-        GF_VALIDATE_OR_GOTO (POSIX_LOCKS, flock, out);
-        GF_VALIDATE_OR_GOTO (POSIX_LOCKS, transport, out);
-        GF_VALIDATE_OR_GOTO (POSIX_LOCKS, fd, out);
+        GF_VALIDATE_OR_GOTO ("posix-locks", flock, out);
+        GF_VALIDATE_OR_GOTO ("posix-locks", client, out);
+        GF_VALIDATE_OR_GOTO ("posix-locks", fd, out);
 
         lock = GF_CALLOC (1, sizeof (posix_lock_t),
                           gf_locks_mt_posix_lock_t);
@@ -485,7 +486,7 @@ new_posix_lock (struct gf_flock *flock, void *transport, pid_t client_pid,
         else
                 lock->fl_end = flock->l_start + flock->l_len - 1;
 
-        lock->transport  = transport;
+        lock->client     = client;
         lock->fd_num     = fd_to_fdnum (fd);
         lock->fd         = fd;
         lock->client_pid = client_pid;
@@ -565,7 +566,7 @@ same_owner (posix_lock_t *l1, posix_lock_t *l2)
 {
 
         return (is_same_lkowner (&l1->owner, &l2->owner) &&
-                (l1->transport  == l2->transport));
+                (l1->client == l2->client));
 
 }
 
@@ -694,7 +695,7 @@ subtract_locks (posix_lock_t *big, posix_lock_t *small)
         }
 
         GF_ASSERT (0);
-        gf_log (POSIX_LOCKS, GF_LOG_ERROR, "Unexpected case in subtract_locks");
+        gf_log ("posix-locks", GF_LOG_ERROR, "Unexpected case in subtract_locks");
 
 out:
         if (v.locks[0]) {
@@ -812,7 +813,7 @@ __insert_and_merge (pl_inode_t *pl_inode, posix_lock_t *lock)
                                 sum = add_locks (lock, conf);
 
                                 sum->fl_type    = lock->fl_type;
-                                sum->transport  = lock->transport;
+                                sum->client     = lock->client;
                                 sum->fd_num     = lock->fd_num;
                                 sum->client_pid = lock->client_pid;
                                 sum->owner      = lock->owner;
@@ -830,7 +831,7 @@ __insert_and_merge (pl_inode_t *pl_inode, posix_lock_t *lock)
                                 sum = add_locks (lock, conf);
 
                                 sum->fl_type    = conf->fl_type;
-                                sum->transport  = conf->transport;
+                                sum->client     = conf->client;
                                 sum->fd_num     = conf->fd_num;
                                 sum->client_pid = conf->client_pid;
                                 sum->owner      = conf->owner;
@@ -988,7 +989,7 @@ pl_send_prelock_unlock (xlator_t *this, pl_inode_t *pl_inode,
         flock.l_len    = old_lock->user_flock.l_len;
 
 
-        unlock_lock = new_posix_lock (&flock, old_lock->transport,
+        unlock_lock = new_posix_lock (&flock, old_lock->client,
                                       old_lock->client_pid, &old_lock->owner,
                                       old_lock->fd);
         GF_VALIDATE_OR_GOTO (this->name, unlock_lock, out);
@@ -1097,3 +1098,124 @@ pl_getlk (pl_inode_t *pl_inode, posix_lock_t *lock)
 
         return conf;
 }
+
+
+struct _lock_table *
+pl_lock_table_new (void)
+{
+        struct _lock_table *new = NULL;
+
+        new = GF_CALLOC (1, sizeof (struct _lock_table), gf_common_mt_lock_table);
+        if (new == NULL) {
+                goto out;
+        }
+        INIT_LIST_HEAD (&new->entrylk_lockers);
+        INIT_LIST_HEAD (&new->inodelk_lockers);
+        LOCK_INIT (&new->lock);
+out:
+        return new;
+}
+
+
+int
+pl_add_locker (struct _lock_table *table, const char *volume,
+               loc_t *loc, fd_t *fd, pid_t pid, gf_lkowner_t *owner,
+               glusterfs_fop_t type)
+{
+        int32_t         ret = -1;
+        struct _locker *new = NULL;
+
+        GF_VALIDATE_OR_GOTO ("lock-table", table, out);
+        GF_VALIDATE_OR_GOTO ("lock-table", volume, out);
+
+        new = GF_CALLOC (1, sizeof (struct _locker), gf_common_mt_locker);
+        if (new == NULL) {
+                goto out;
+        }
+        INIT_LIST_HEAD (&new->lockers);
+
+        new->volume = gf_strdup (volume);
+
+        if (fd == NULL) {
+                loc_copy (&new->loc, loc);
+        } else {
+                new->fd = fd_ref (fd);
+        }
+
+        new->pid   = pid;
+        new->owner = *owner;
+
+        LOCK (&table->lock);
+        {
+                if (type == GF_FOP_ENTRYLK)
+                        list_add_tail (&new->lockers, &table->entrylk_lockers);
+                else
+                        list_add_tail (&new->lockers, &table->inodelk_lockers);
+        }
+        UNLOCK (&table->lock);
+out:
+        return ret;
+}
+
+int
+pl_del_locker (struct _lock_table *table, const char *volume,
+               loc_t *loc, fd_t *fd, gf_lkowner_t *owner, glusterfs_fop_t type)
+{
+        struct _locker    *locker = NULL;
+        struct _locker    *tmp = NULL;
+        int32_t            ret = -1;
+        struct list_head  *head = NULL;
+        struct list_head   del;
+
+        GF_VALIDATE_OR_GOTO ("lock-table", table, out);
+        GF_VALIDATE_OR_GOTO ("lock-table", volume, out);
+
+        INIT_LIST_HEAD (&del);
+
+        LOCK (&table->lock);
+        {
+                if (type == GF_FOP_ENTRYLK) {
+                        head = &table->entrylk_lockers;
+                } else {
+                        head = &table->inodelk_lockers;
+                }
+
+                list_for_each_entry_safe (locker, tmp, head, lockers) {
+                        if (!is_same_lkowner (&locker->owner, owner) ||
+                            strcmp (locker->volume, volume))
+                                continue;
+
+                        /*
+                         * It is possible for inodelk lock to come on anon-fd
+                         * and inodelk unlock to come on normal fd in case of
+                         * client re-opens. So don't check for fds to be equal.
+                         */
+                        if (locker->fd && fd)
+                                list_move_tail (&locker->lockers, &del);
+                        else if (locker->loc.inode && loc &&
+                                 (locker->loc.inode == loc->inode))
+                                list_move_tail (&locker->lockers, &del);
+                }
+        }
+        UNLOCK (&table->lock);
+
+        tmp = NULL;
+        locker = NULL;
+
+        list_for_each_entry_safe (locker, tmp, &del, lockers) {
+                list_del_init (&locker->lockers);
+                if (locker->fd)
+                        fd_unref (locker->fd);
+                else
+                        loc_wipe (&locker->loc);
+
+                GF_FREE (locker->volume);
+                GF_FREE (locker);
+        }
+
+        ret = 0;
+out:
+        return ret;
+
+}
+
diff --git a/xlators/features/locks/src/common.h b/xlators/features/locks/src/common.h
index 94ef4b2b4..db19ec978 100644
--- a/xlators/features/locks/src/common.h
+++ b/xlators/features/locks/src/common.h
@@ -14,12 +14,14 @@
 /*dump locks format strings */
 #define RANGE_FMT               "type=%s, whence=%hd, start=%llu, len=%llu"
 #define ENTRY_FMT               "type=%s on basename=%s"
-#define DUMP_GEN_FMT            "pid = %llu, owner=%s, transport=%p, "
+#define DUMP_GEN_FMT            "pid = %llu, owner=%s, client=%p"
 #define GRNTD_AT                "granted at %s"
 #define BLKD_AT                 "blocked at %s"
-#define DUMP_BLKD_FMT           DUMP_GEN_FMT", "BLKD_AT
-#define DUMP_GRNTD_FMT          DUMP_GEN_FMT", "GRNTD_AT
-#define DUMP_BLKD_GRNTD_FMT     DUMP_GEN_FMT", "BLKD_AT", "GRNTD_AT
+#define CONN_ID                 "connection-id=%s"
+#define DUMP_BLKD_FMT           DUMP_GEN_FMT", "CONN_ID", "BLKD_AT
+#define DUMP_GRNTD_FMT          DUMP_GEN_FMT", "CONN_ID", "GRNTD_AT
+#define DUMP_BLKD_GRNTD_FMT     DUMP_GEN_FMT", "CONN_ID", "BLKD_AT", "GRNTD_AT
+
 #define ENTRY_BLKD_FMT          ENTRY_FMT", "DUMP_BLKD_FMT
 #define ENTRY_GRNTD_FMT         ENTRY_FMT", "DUMP_GRNTD_FMT
 #define ENTRY_BLKD_GRNTD_FMT    ENTRY_FMT", "DUMP_BLKD_GRNTD_FMT
@@ -29,8 +31,24 @@
 #define RANGE_BLKD_GRNTD_FMT    RANGE_FMT", "DUMP_BLKD_GRNTD_FMT
 
 #define SET_FLOCK_PID(flock, lock) ((flock)->l_pid = lock->client_pid)
+
+struct _locker {
+        struct list_head  lockers;
+        char             *volume;
+        loc_t             loc;
+        fd_t             *fd;
+        gf_lkowner_t      owner;
+        pid_t             pid;
+};
+
+struct _lock_table {
+        struct list_head  inodelk_lockers;
+        struct list_head  entrylk_lockers;
+        gf_lock_t         lock;
+};
+
 posix_lock_t *
-new_posix_lock (struct gf_flock *flock, void *transport, pid_t client_pid,
+new_posix_lock (struct gf_flock *flock, client_t *client, pid_t client_pid,
                 gf_lkowner_t *owner, fd_t *fd);
 
 pl_inode_t *
@@ -63,7 +81,8 @@ pl_dom_list_t *
 get_domain (pl_inode_t *pl_inode, const char *volume);
 
 void
-grant_blocked_inode_locks (xlator_t *this, pl_inode_t *pl_inode, pl_dom_list_t *dom);
+grant_blocked_inode_locks (xlator_t *this, pl_inode_t *pl_inode,
+                           pl_dom_list_t *dom);
 
 void
 __delete_inode_lock (pl_inode_lock_t *lock);
@@ -78,9 +97,9 @@ grant_blocked_entry_locks (xlator_t *this, pl_inode_t *pl_inode,
 void pl_update_refkeeper (xlator_t *this, inode_t *inode);
 
 int32_t
-__get_inodelk_count (xlator_t *this, pl_inode_t *pl_inode);
+__get_inodelk_count (xlator_t *this, pl_inode_t *pl_inode, char *domname);
 int32_t
-get_inodelk_count (xlator_t *this, inode_t *inode);
+get_inodelk_count (xlator_t *this, inode_t *inode, char *domname);
 
 int32_t
 __get_entrylk_count (xlator_t *this, pl_inode_t *pl_inode);
@@ -143,6 +162,26 @@ pl_verify_reservelk (xlator_t *this, pl_inode_t *pl_inode,
                      posix_lock_t *lock, int can_block);
 int
 pl_reserve_unlock (xlator_t *this, pl_inode_t *pl_inode, posix_lock_t *reqlock);
+
 uint32_t
 check_entrylk_on_basename (xlator_t *this, inode_t *parent, char *basename);
+
+int32_t
+pl_add_locker (struct _lock_table *table, const char *volume,
+               loc_t *loc,
+               fd_t *fd,
+               pid_t pid,
+               gf_lkowner_t *owner,
+               glusterfs_fop_t type);
+
+int32_t
+pl_del_locker (struct _lock_table *table, const char *volume,
+               loc_t *loc,
+               fd_t *fd,
+               gf_lkowner_t *owner,
+               glusterfs_fop_t type);
+
+struct _lock_table *
+pl_lock_table_new (void);
+
 #endif /* __COMMON_H__ */
diff --git a/xlators/features/locks/src/entrylk.c b/xlators/features/locks/src/entrylk.c
index 738b43be2..0785dc547 100644
--- a/xlators/features/locks/src/entrylk.c
+++ b/xlators/features/locks/src/entrylk.c
@@ -25,7 +25,7 @@
 
 static pl_entry_lock_t *
 new_entrylk_lock (pl_inode_t *pinode, const char *basename, entrylk_type type,
-                  void *trans, pid_t client_pid, gf_lkowner_t *owner,
+                  client_t *client, pid_t client_pid, gf_lkowner_t *owner,
                   const char *volume)
 
 {
@@ -39,7 +39,7 @@ new_entrylk_lock (pl_inode_t *pinode, const char *basename, entrylk_type type,
 
         newlock->basename   = basename ? gf_strdup (basename) : NULL;
         newlock->type       = type;
-        newlock->trans      = trans;
+        newlock->trans      = client;
         newlock->volume     = volume;
         newlock->client_pid = client_pid;
         newlock->owner      = *owner;
@@ -305,18 +305,15 @@ __find_most_matching_lock (pl_dom_list_t *dom, const char *basename)
 
 int
 __lock_name (pl_inode_t *pinode, const char *basename, entrylk_type type,
-             call_frame_t *frame, pl_dom_list_t *dom, xlator_t *this, int nonblock)
+             call_frame_t *frame, pl_dom_list_t *dom, xlator_t *this,
+             int nonblock, char *conn_id)
 {
         pl_entry_lock_t *lock       = NULL;
         pl_entry_lock_t *conf       = NULL;
-        void            *trans      = NULL;
-        pid_t            client_pid = 0;
         int              ret        = -EINVAL;
 
-        trans = frame->root->trans;
-        client_pid = frame->root->pid;
-
-        lock = new_entrylk_lock (pinode, basename, type, trans, client_pid,
+        lock = new_entrylk_lock (pinode, basename, type,
+                                 frame->root->client, frame->root->pid,
                                  &frame->root->lk_owner, dom->domain);
         if (!lock) {
                 ret = -ENOMEM;
@@ -325,12 +322,17 @@ __lock_name (pl_inode_t *pinode, const char *basename, entrylk_type type,
 
         lock->frame   = frame;
         lock->this    = this;
-        lock->trans   = trans;
+        lock->trans   = frame->root->client;
+
+        if (conn_id) {
+                lock->connection_id = gf_strdup (conn_id);
+        }
 
         conf = __lock_grantable (dom, basename, type);
         if (conf) {
                 ret = -EAGAIN;
                 if (nonblock){
+                        GF_FREE (lock->connection_id);
                         GF_FREE ((char *)lock->basename);
                         GF_FREE (lock);
                         goto out;
@@ -350,6 +352,7 @@ __lock_name (pl_inode_t *pinode, const char *basename, entrylk_type type,
         if ( __blocked_lock_conflict (dom, basename, type) && !(__owner_has_lock (dom, lock))) {
                 ret = -EAGAIN;
                 if (nonblock) {
+                        GF_FREE (lock->connection_id);
                         GF_FREE ((char *) lock->basename);
                         GF_FREE (lock);
                         goto out;
@@ -480,13 +483,15 @@ __grant_blocked_entry_locks (xlator_t *this, pl_inode_t *pl_inode,
                         pl_inode, bl->basename);
 
                 bl_ret = __lock_name (pl_inode, bl->basename, bl->type,
-                                      bl->frame, dom, bl->this, 0);
+                                      bl->frame, dom, bl->this, 0,
+                                      bl->connection_id);
 
                 if (bl_ret == 0) {
                         list_add (&bl->blocked_locks, granted);
                 } else {
                         gf_log (this->name, GF_LOG_DEBUG,
                                 "should never happen");
+                        GF_FREE (bl->connection_id);
                         GF_FREE ((char *)bl->basename);
                         GF_FREE (bl);
                 }
@@ -507,7 +512,8 @@ grant_blocked_entry_locks (xlator_t *this, pl_inode_t *pl_inode,
 
         pthread_mutex_lock (&pl_inode->mutex);
         {
-                __grant_blocked_entry_locks (this, pl_inode, dom, &granted_list);
+                __grant_blocked_entry_locks (this, pl_inode, dom,
+                                             &granted_list);
         }
         pthread_mutex_unlock (&pl_inode->mutex);
 
@@ -520,22 +526,26 @@ grant_blocked_entry_locks (xlator_t *this, pl_inode_t *pl_inode,
 
                 STACK_UNWIND_STRICT (entrylk, lock->frame, 0, 0, NULL);
 
+                GF_FREE (lock->connection_id);
+                GF_FREE ((char *)lock->basename);
+                GF_FREE (lock);
         }
 
         GF_FREE ((char *)unlocked->basename);
+        GF_FREE (unlocked->connection_id);
         GF_FREE (unlocked);
 
         return;
 }
 
 /**
- * release_entry_locks_for_transport: release all entry locks from this
- * transport for this loc_t
+ * release_entry_locks_for_client: release all entry locks from this
+ * client for this loc_t
  */
 
 static int
-release_entry_locks_for_transport (xlator_t *this, pl_inode_t *pinode,
-                                   pl_dom_list_t *dom, void *trans)
+release_entry_locks_for_client (xlator_t *this, pl_inode_t *pinode,
+                                pl_dom_list_t *dom, client_t *client)
 {
         pl_entry_lock_t  *lock = NULL;
         pl_entry_lock_t  *tmp = NULL;
@@ -549,14 +559,14 @@ release_entry_locks_for_transport (xlator_t *this, pl_inode_t *pinode,
         {
                 list_for_each_entry_safe (lock, tmp, &dom->blocked_entrylks,
                                           blocked_locks) {
-                        if (lock->trans != trans)
+                        if (lock->trans != client)
                                 continue;
 
                         list_del_init (&lock->blocked_locks);
 
                         gf_log (this->name, GF_LOG_TRACE,
                                 "releasing lock on  held by "
-                                "{transport=%p}",trans);
+                                "{client=%p}", client);
 
                         list_add (&lock->blocked_locks, &released);
 
@@ -564,16 +574,17 @@ release_entry_locks_for_transport (xlator_t *this, pl_inode_t *pinode,
 
                 list_for_each_entry_safe (lock, tmp, &dom->entrylk_list,
                                           domain_list) {
-                        if (lock->trans != trans)
+                        if (lock->trans != client)
                                 continue;
 
                         list_del_init (&lock->domain_list);
 
                         gf_log (this->name, GF_LOG_TRACE,
                                 "releasing lock on  held by "
-                                "{transport=%p}",trans);
+                                "{client=%p}", client);
 
                         GF_FREE ((char *)lock->basename);
+                        GF_FREE (lock->connection_id);
                         GF_FREE (lock);
                 }
 
@@ -589,6 +600,7 @@ release_entry_locks_for_transport (xlator_t *this, pl_inode_t *pinode,
                 STACK_UNWIND_STRICT (entrylk, lock->frame, -1, EAGAIN, NULL);
 
                 GF_FREE ((char *)lock->basename);
+                GF_FREE (lock->connection_id);
                 GF_FREE (lock);
 
         }
@@ -599,6 +611,7 @@ release_entry_locks_for_transport (xlator_t *this, pl_inode_t *pinode,
                 STACK_UNWIND_STRICT (entrylk, lock->frame, 0, 0, NULL);
 
                 GF_FREE ((char *)lock->basename);
+                GF_FREE (lock->connection_id);
                 GF_FREE (lock);
         }
 
@@ -609,19 +622,23 @@ release_entry_locks_for_transport (xlator_t *this, pl_inode_t *pinode,
 int
 pl_common_entrylk (call_frame_t *frame, xlator_t *this,
                    const char *volume, inode_t *inode, const char *basename,
-                   entrylk_cmd cmd, entrylk_type type, loc_t *loc, fd_t *fd)
-{
-        int32_t  op_ret   = -1;
-        int32_t  op_errno = 0;
+                   entrylk_cmd cmd, entrylk_type type, loc_t *loc, fd_t *fd,
+                   dict_t *xdata)
 
-        void *        transport = NULL;
-
-        pl_inode_t *     pinode   = NULL;
+{
+        int32_t          op_ret   = -1;
+        int32_t          op_errno = 0;
         int              ret      = -1;
-        pl_entry_lock_t *unlocked = NULL;
         char             unwind   = 1;
+        GF_UNUSED int    dict_ret = -1;
+        pl_inode_t      *pinode   = NULL;
+        pl_entry_lock_t *unlocked = NULL;
+        pl_dom_list_t   *dom      = NULL;
+        char            *conn_id  = NULL;
+        pl_ctx_t        *ctx      = NULL;
 
-        pl_dom_list_t          *dom = NULL;
+        if (xdata)
+                dict_ret = dict_get_str (xdata, "connection-id", &conn_id);
 
         pinode = pl_inode_get (this, inode);
         if (!pinode) {
@@ -637,18 +654,17 @@ pl_common_entrylk (call_frame_t *frame, xlator_t *this,
 
         entrylk_trace_in (this, frame, volume, fd, loc, basename, cmd, type);
 
-        transport = frame->root->trans;
-
         if (frame->root->lk_owner.len == 0) {
                 /*
                   this is a special case that means release
-                  all locks from this transport
+                  all locks from this client
                 */
 
                 gf_log (this->name, GF_LOG_TRACE,
-                        "Releasing locks for transport %p", transport);
+                        "Releasing locks for client %p", frame->root->client);
 
-                release_entry_locks_for_transport (this, pinode, dom, transport);
+                release_entry_locks_for_client (this, pinode, dom,
+                                                frame->root->client);
                 op_ret = 0;
 
                 goto out;
@@ -659,7 +675,7 @@ pl_common_entrylk (call_frame_t *frame, xlator_t *this,
                 pthread_mutex_lock (&pinode->mutex);
                 {
                         ret = __lock_name (pinode, basename, type,
-                                           frame, dom, this, 0);
+                                           frame, dom, this, 0, conn_id);
                 }
                 pthread_mutex_unlock (&pinode->mutex);
 
@@ -684,7 +700,7 @@ pl_common_entrylk (call_frame_t *frame, xlator_t *this,
                 pthread_mutex_lock (&pinode->mutex);
                 {
                         ret = __lock_name (pinode, basename, type,
-                                           frame, dom, this, 1);
+                                           frame, dom, this, 1, conn_id);
                 }
                 pthread_mutex_unlock (&pinode->mutex);
 
@@ -721,6 +737,24 @@ out:
                 entrylk_trace_out (this, frame, volume, fd, loc, basename,
                                    cmd, type, op_ret, op_errno);
 
+                ctx = pl_ctx_get (frame->root->client, this);
+
+                if (ctx == NULL) {
+                        gf_log (this->name, GF_LOG_INFO, "pl_ctx_get() failed");
+                        goto unwind;
+                }
+
+                if (cmd == ENTRYLK_UNLOCK)
+                        pl_del_locker (ctx->ltable, volume, loc, fd,
+                                       &frame->root->lk_owner,
+                                       GF_FOP_ENTRYLK);
+                else
+                        pl_add_locker (ctx->ltable, volume, loc, fd,
+                                       frame->root->pid,
+                                       &frame->root->lk_owner,
+                                       GF_FOP_ENTRYLK);
+
+unwind:
                 STACK_UNWIND_STRICT (entrylk, frame, op_ret, op_errno, NULL);
         } else {
                 entrylk_trace_block (this, frame, volume, fd, loc, basename,
@@ -740,10 +774,10 @@ out:
 int
 pl_entrylk (call_frame_t *frame, xlator_t *this,
             const char *volume, loc_t *loc, const char *basename,
-            entrylk_cmd cmd, entrylk_type type)
+            entrylk_cmd cmd, entrylk_type type, dict_t *xdata)
 {
-
-        pl_common_entrylk (frame, this, volume, loc->inode, basename, cmd, type, loc, NULL);
+        pl_common_entrylk (frame, this, volume, loc->inode, basename, cmd,
+                           type, loc, NULL, xdata);
 
         return 0;
 }
@@ -758,10 +792,10 @@ pl_entrylk (call_frame_t *frame, xlator_t *this,
 int
 pl_fentrylk (call_frame_t *frame, xlator_t *this,
              const char *volume, fd_t *fd, const char *basename,
-             entrylk_cmd cmd, entrylk_type type)
+             entrylk_cmd cmd, entrylk_type type, dict_t *xdata)
 {
-
-        pl_common_entrylk (frame, this, volume, fd->inode, basename, cmd, type, NULL, fd);
+        pl_common_entrylk (frame, this, volume, fd->inode, basename, cmd,
+                           type, NULL, fd, xdata);
 
         return 0;
 }
diff --git a/xlators/features/locks/src/inodelk.c b/xlators/features/locks/src/inodelk.c
index 42350e59a..508523e11 100644
--- a/xlators/features/locks/src/inodelk.c
+++ b/xlators/features/locks/src/inodelk.c
@@ -39,8 +39,10 @@ inline void
 __pl_inodelk_unref (pl_inode_lock_t *lock)
 {
         lock->ref--;
-        if (!lock->ref)
+        if (!lock->ref) {
+                GF_FREE (lock->connection_id);
                 GF_FREE (lock);
+        }
 }
 
 /* Check if 2 inodelks are conflicting on type. Only 2 shared locks don't conflict */
@@ -122,7 +124,7 @@ static inline int
 same_inodelk_owner (pl_inode_lock_t *l1, pl_inode_lock_t *l2)
 {
         return (is_same_lkowner (&l1->owner, &l2->owner) &&
-                (l1->transport  == l2->transport));
+                (l1->client == l2->client));
 }
 
 /* Returns true if the 2 inodelks conflict with each other */
@@ -292,7 +294,7 @@ __inode_unlock_lock (xlator_t *this, pl_inode_lock_t *lock, pl_dom_list_t *dom)
                         " Matching lock not found for unlock %llu-%llu, by %s "
                         "on %p", (unsigned long long)lock->fl_start,
                         (unsigned long long)lock->fl_end,
-                        lkowner_utoa (&lock->owner), lock->transport);
+                        lkowner_utoa (&lock->owner), lock->client);
                 goto out;
         }
         __delete_inode_lock (conf);
@@ -300,7 +302,7 @@ __inode_unlock_lock (xlator_t *this, pl_inode_lock_t *lock, pl_dom_list_t *dom)
                 " Matching lock found for unlock %llu-%llu, by %s on %p",
                 (unsigned long long)lock->fl_start,
                 (unsigned long long)lock->fl_end, lkowner_utoa (&lock->owner),
-                lock->transport);
+                lock->client);
 
 out:
         return conf;
@@ -333,7 +335,8 @@ __grant_blocked_inode_locks (xlator_t *this, pl_inode_t *pl_inode,
 
 /* Grant all inodelks blocked on a lock */
 void
-grant_blocked_inode_locks (xlator_t *this, pl_inode_t *pl_inode, pl_dom_list_t *dom)
+grant_blocked_inode_locks (xlator_t *this, pl_inode_t *pl_inode,
+                           pl_dom_list_t *dom)
 {
         struct list_head granted;
         pl_inode_lock_t *lock;
@@ -372,10 +375,10 @@ grant_blocked_inode_locks (xlator_t *this, pl_inode_t *pl_inode, pl_dom_list_t *
         pthread_mutex_unlock (&pl_inode->mutex);
 }
 
-/* Release all inodelks from this transport */
+/* Release all inodelks from this client */
 static int
-release_inode_locks_of_transport (xlator_t *this, pl_dom_list_t *dom,
-                                  inode_t *inode, void *trans)
+release_inode_locks_of_client (xlator_t *this, pl_dom_list_t *dom,
+                                  inode_t *inode, client_t *client)
 {
         pl_inode_lock_t *tmp = NULL;
         pl_inode_lock_t *l = NULL;
@@ -395,7 +398,7 @@ release_inode_locks_of_transport (xlator_t *this, pl_dom_list_t *dom,
         {
 
                 list_for_each_entry_safe (l, tmp, &dom->blocked_inodelks, blocked_locks) {
-                        if (l->transport != trans)
+                        if (l->client != client)
                                 continue;
 
                         list_del_init (&l->blocked_locks);
@@ -408,8 +411,8 @@ release_inode_locks_of_transport (xlator_t *this, pl_dom_list_t *dom,
 
                         gf_log (this->name, GF_LOG_DEBUG,
                                 "releasing blocking lock on %s held by "
-                                "{transport=%p, pid=%"PRId64" lk-owner=%s}",
-                                file, trans, (uint64_t) l->client_pid,
+                                "{client=%p, pid=%"PRId64" lk-owner=%s}",
+                                file, client, (uint64_t) l->client_pid,
                                 lkowner_utoa (&l->owner));
 
                         list_add (&l->blocked_locks, &released);
@@ -420,7 +423,7 @@ release_inode_locks_of_transport (xlator_t *this, pl_dom_list_t *dom,
                 }
 
                 list_for_each_entry_safe (l, tmp, &dom->inodelk_list, list) {
-                        if (l->transport != trans)
+                        if (l->client != client)
                                 continue;
 
                         inode_path (inode, NULL, &path);
@@ -431,8 +434,8 @@ release_inode_locks_of_transport (xlator_t *this, pl_dom_list_t *dom,
 
                         gf_log (this->name, GF_LOG_DEBUG,
                                 "releasing granted lock on %s held by "
-                                "{transport=%p, pid=%"PRId64" lk-owner=%s}",
-                                file, trans, (uint64_t) l->client_pid,
+                                "{client=%p, pid=%"PRId64" lk-owner=%s}",
+                                file, client, (uint64_t) l->client_pid,
                                 lkowner_utoa (&l->owner));
 
                         if (path) {
@@ -515,8 +518,9 @@ out:
 
 /* Create a new inode_lock_t */
 pl_inode_lock_t *
-new_inode_lock (struct gf_flock *flock, void *transport, pid_t client_pid,
-                gf_lkowner_t *owner, const char *volume)
+new_inode_lock (struct gf_flock *flock, client_t *client, pid_t client_pid,
+                call_frame_t *frame, xlator_t *this, const char *volume,
+                char *conn_id)
 
 {
         pl_inode_lock_t *lock = NULL;
@@ -535,10 +539,16 @@ new_inode_lock (struct gf_flock *flock, void *transport, pid_t client_pid,
         else
                 lock->fl_end = flock->l_start + flock->l_len - 1;
 
-        lock->transport  = transport;
+        lock->client     = client;
         lock->client_pid = client_pid;
         lock->volume     = volume;
-        lock->owner      = *owner;
+        lock->owner      = frame->root->lk_owner;
+        lock->frame      = frame;
+        lock->this       = this;
+
+        if (conn_id) {
+                lock->connection_id = gf_strdup (conn_id);
+        }
 
         INIT_LIST_HEAD (&lock->list);
         INIT_LIST_HEAD (&lock->blocked_locks);
@@ -547,21 +557,58 @@ new_inode_lock (struct gf_flock *flock, void *transport, pid_t client_pid,
         return lock;
 }
 
+int32_t
+_pl_convert_volume (const char *volume, char **res)
+{
+        char    *mdata_vol = NULL;
+        int     ret = 0;
+
+        mdata_vol = strrchr (volume, ':');
+        //if the volume already ends with :metadata don't bother
+        if (mdata_vol && (strcmp (mdata_vol, ":metadata") == 0))
+                return 0;
+
+        ret = gf_asprintf (res, "%s:metadata", volume);
+        if (ret <= 0)
+                return ENOMEM;
+        return 0;
+}
+
+int32_t
+_pl_convert_volume_for_special_range (struct gf_flock *flock,
+                                      const char *volume, char **res)
+{
+        int32_t     ret = 0;
+
+        if ((flock->l_start == LLONG_MAX -1) &&
+            (flock->l_len == 0)) {
+                ret = _pl_convert_volume (volume, res);
+        }
+
+        return ret;
+}
+
 /* Common inodelk code called from pl_inodelk and pl_finodelk */
 int
 pl_common_inodelk (call_frame_t *frame, xlator_t *this,
                    const char *volume, inode_t *inode, int32_t cmd,
-                   struct gf_flock *flock, loc_t *loc, fd_t *fd)
+                   struct gf_flock *flock, loc_t *loc, fd_t *fd, dict_t *xdata)
 {
         int32_t           op_ret     = -1;
         int32_t           op_errno   = 0;
         int               ret        = -1;
+        GF_UNUSED int     dict_ret   = -1;
         int               can_block  = 0;
-        pid_t             client_pid = -1;
-        void *            transport  = NULL;
         pl_inode_t *      pinode     = NULL;
         pl_inode_lock_t * reqlock    = NULL;
         pl_dom_list_t *   dom        = NULL;
+        char             *res        = NULL;
+        char             *res1       = NULL;
+        char             *conn_id    = NULL;
+        pl_ctx_t         *ctx        = NULL;
+
+        if (xdata)
+                dict_ret = dict_get_str (xdata, "connection-id", &conn_id);
 
         VALIDATE_OR_GOTO (frame, out);
         VALIDATE_OR_GOTO (inode, unwind);
@@ -572,10 +619,13 @@ pl_common_inodelk (call_frame_t *frame, xlator_t *this,
                 goto unwind;
         }
 
-        pl_trace_in (this, frame, fd, loc, cmd, flock, volume);
+        op_errno = _pl_convert_volume_for_special_range (flock, volume, &res);
+        if (op_errno)
+                goto unwind;
+        if (res)
+                volume = res;
 
-        transport  = frame->root->trans;
-        client_pid = frame->root->pid;
+        pl_trace_in (this, frame, fd, loc, cmd, flock, volume);
 
         pinode = pl_inode_get (this, inode);
         if (!pinode) {
@@ -592,19 +642,26 @@ pl_common_inodelk (call_frame_t *frame, xlator_t *this,
         if (frame->root->lk_owner.len == 0) {
                 /*
                   special case: this means release all locks
-                  from this transport
+                  from this client
                 */
                 gf_log (this->name, GF_LOG_TRACE,
-                        "Releasing all locks from transport %p", transport);
-
-                release_inode_locks_of_transport (this, dom, inode, transport);
+                        "Releasing all locks from client %p", frame->root->client);
+
+                release_inode_locks_of_client (this, dom, inode, frame->root->client);
+                _pl_convert_volume (volume, &res1);
+                if (res1) {
+                        dom = get_domain (pinode, res1);
+                        if (dom)
+                                release_inode_locks_of_client (this, dom,
+                                                        inode, frame->root->client);
+                }
 
                 op_ret = 0;
                 goto unwind;
         }
 
-        reqlock = new_inode_lock (flock, transport, client_pid,
-                                  &frame->root->lk_owner, volume);
+        reqlock = new_inode_lock (flock, frame->root->client, frame->root->pid,
+                                  frame, this, volume, conn_id);
 
         if (!reqlock) {
                 op_ret = -1;
@@ -612,14 +669,10 @@ pl_common_inodelk (call_frame_t *frame, xlator_t *this,
                 goto unwind;
         }
 
-        reqlock->frame = frame;
-        reqlock->this  = this;
 
         switch (cmd) {
         case F_SETLKW:
                 can_block = 1;
-                reqlock->frame = frame;
-                reqlock->this  = this;
 
                 /* fall through */
 
@@ -651,6 +704,23 @@ pl_common_inodelk (call_frame_t *frame, xlator_t *this,
 
         op_ret = 0;
 
+        ctx = pl_ctx_get (frame->root->client, this);
+
+        if (ctx == NULL) {
+                gf_log (this->name, GF_LOG_INFO, "pl_ctx_get() failed");
+                goto unwind;
+        }
+
+        if (flock->l_type == F_UNLCK)
+                pl_del_locker (ctx->ltable, volume, loc, fd,
+                               &frame->root->lk_owner,
+                               GF_FOP_INODELK);
+        else
+                pl_add_locker (ctx->ltable, volume, loc, fd,
+                               frame->root->pid,
+                               &frame->root->lk_owner,
+                               GF_FOP_INODELK);
+
 unwind:
         if ((inode != NULL) && (flock !=NULL)) {
                 pl_update_refkeeper (this, inode);
@@ -659,53 +729,78 @@ unwind:
 
         STACK_UNWIND_STRICT (inodelk, frame, op_ret, op_errno, NULL);
 out:
+        GF_FREE (res);
+        GF_FREE (res1);
         return 0;
 }
 
 int
 pl_inodelk (call_frame_t *frame, xlator_t *this,
-            const char *volume, loc_t *loc, int32_t cmd, struct gf_flock *flock)
+            const char *volume, loc_t *loc, int32_t cmd, struct gf_flock *flock,
+            dict_t *xdata)
 {
-
-        pl_common_inodelk (frame, this, volume, loc->inode, cmd, flock, loc, NULL);
+        pl_common_inodelk (frame, this, volume, loc->inode, cmd, flock,
+                           loc, NULL, xdata);
 
         return 0;
 }
 
 int
 pl_finodelk (call_frame_t *frame, xlator_t *this,
-             const char *volume, fd_t *fd, int32_t cmd, struct gf_flock *flock)
+             const char *volume, fd_t *fd, int32_t cmd, struct gf_flock *flock,
+             dict_t *xdata)
 {
-
-        pl_common_inodelk (frame, this, volume, fd->inode, cmd, flock, NULL, fd);
+        pl_common_inodelk (frame, this, volume, fd->inode, cmd, flock,
+                           NULL, fd, xdata);
 
         return 0;
 
 }
 
+static inline int32_t
+__get_inodelk_dom_count (pl_dom_list_t *dom)
+{
+        pl_inode_lock_t     *lock   = NULL;
+        int32_t             count   = 0;
+
+        list_for_each_entry (lock, &dom->inodelk_list, list) {
+                count++;
+        }
+        list_for_each_entry (lock, &dom->blocked_inodelks, blocked_locks) {
+                count++;
+        }
+        return count;
+}
 
+/* Returns the no. of locks (blocked/granted) held on a given domain name
+ * If @domname is NULL, returns the no. of locks in all the domains present.
+ * If @domname is non-NULL and non-existent, returns 0 */
 int32_t
-__get_inodelk_count (xlator_t *this, pl_inode_t *pl_inode)
+__get_inodelk_count (xlator_t *this, pl_inode_t *pl_inode, char *domname)
 {
         int32_t            count  = 0;
-        pl_inode_lock_t   *lock   = NULL;
         pl_dom_list_t     *dom    = NULL;
 
         list_for_each_entry (dom, &pl_inode->dom_list, inode_list) {
-                list_for_each_entry (lock, &dom->inodelk_list, list) {
-                        count++;
-                }
-                list_for_each_entry (lock, &dom->blocked_inodelks, blocked_locks) {
-                        count++;
-                }
+                if (domname) {
+                        if (strcmp (domname, dom->domain) == 0) {
+                                count = __get_inodelk_dom_count (dom);
+                                goto out;
+                        }
+
+                } else {
+                    /* Counting locks from all domains */
+                        count += __get_inodelk_dom_count (dom);
 
+                }
         }
 
+out:
         return count;
 }
 
 int32_t
-get_inodelk_count (xlator_t *this, inode_t *inode)
+get_inodelk_count (xlator_t *this, inode_t *inode, char *domname)
 {
         pl_inode_t   *pl_inode = NULL;
         uint64_t      tmp_pl_inode = 0;
@@ -721,7 +816,7 @@ get_inodelk_count (xlator_t *this, inode_t *inode)
 
         pthread_mutex_lock (&pl_inode->mutex);
         {
-                count = __get_inodelk_count (this, pl_inode);
+                count = __get_inodelk_count (this, pl_inode, domname);
         }
         pthread_mutex_unlock (&pl_inode->mutex);
 
diff --git a/xlators/features/locks/src/locks.h b/xlators/features/locks/src/locks.h
index 7ffc67e1b..76fc941d7 100644
--- a/xlators/features/locks/src/locks.h
+++ b/xlators/features/locks/src/locks.h
@@ -19,10 +19,10 @@
 #include "stack.h"
 #include "call-stub.h"
 #include "locks-mem-types.h"
+#include "client_t.h"
 
 #include "lkowner.h"
 
-#define POSIX_LOCKS "posix-locks"
 struct __pl_fd;
 
 struct __posix_lock {
@@ -33,7 +33,7 @@ struct __posix_lock {
         off_t              fl_end;
 
         short              blocked;    /* waiting to acquire */
-        struct gf_flock       user_flock; /* the flock supplied by the user */
+        struct gf_flock    user_flock; /* the flock supplied by the user */
         xlator_t          *this;       /* required for blocked locks */
         unsigned long      fd_num;
 
@@ -46,7 +46,7 @@ struct __posix_lock {
         /* These two together serve to uniquely identify each process
            across nodes */
 
-        void              *transport;     /* to identify client node */
+        void              *client;     /* to identify client node */
         gf_lkowner_t       owner;
         pid_t              client_pid;    /* pid of client process */
 };
@@ -63,7 +63,7 @@ struct __pl_inode_lock {
 
         const char        *volume;
 
-        struct gf_flock       user_flock; /* the flock supplied by the user */
+        struct gf_flock    user_flock; /* the flock supplied by the user */
         xlator_t          *this;       /* required for blocked locks */
         fd_t              *fd;
 
@@ -75,9 +75,11 @@ struct __pl_inode_lock {
         /* These two together serve to uniquely identify each process
            across nodes */
 
-        void              *transport;     /* to identify client node */
+        void              *client;     /* to identify client node */
         gf_lkowner_t       owner;
         pid_t              client_pid;    /* pid of client process */
+
+        char              *connection_id; /* stores the client connection id */
 };
 typedef struct __pl_inode_lock pl_inode_lock_t;
 
@@ -115,7 +117,9 @@ struct __entry_lock {
 
         void             *trans;
         gf_lkowner_t      owner;
-        pid_t             client_pid;    /* pid of client process */
+	pid_t             client_pid;    /* pid of client process */
+
+        char             *connection_id; /* stores the client connection id */
 };
 typedef struct __entry_lock pl_entry_lock_t;
 
@@ -152,9 +156,11 @@ typedef struct {
         char           *brickname;
 } posix_locks_private_t;
 
+
 typedef struct {
         gf_boolean_t   entrylk_count_req;
         gf_boolean_t   inodelk_count_req;
+        gf_boolean_t   inodelk_dom_count_req;
         gf_boolean_t   posixlk_count_req;
         gf_boolean_t   parent_entrylk_req;
 
@@ -166,8 +172,21 @@ typedef struct {
         enum {TRUNCATE, FTRUNCATE} op;
 } pl_local_t;
 
+
 typedef struct {
         struct list_head locks_list;
 } pl_fdctx_t;
 
+
+typedef struct _locks_ctx {
+        gf_lock_t            ltable_lock; /* only for replace, 
+                                             ltable has its own internal 
+                                             lock for operations */
+        struct _lock_table  *ltable;
+} pl_ctx_t;
+
+
+pl_ctx_t *
+pl_ctx_get (client_t *client, xlator_t *xlator);
+
 #endif /* __POSIX_LOCKS_H__ */
diff --git a/xlators/features/locks/src/posix.c b/xlators/features/locks/src/posix.c
index 2bc5f8581..7bfb38a51 100644
--- a/xlators/features/locks/src/posix.c
+++ b/xlators/features/locks/src/posix.c
@@ -51,7 +51,7 @@ pl_new_fdctx ()
 
         fdctx = GF_CALLOC (1, sizeof (*fdctx),
                            gf_locks_mt_pl_fdctx_t);
-        GF_VALIDATE_OR_GOTO (POSIX_LOCKS, fdctx, out);
+        GF_VALIDATE_OR_GOTO ("posix-locks", fdctx, out);
 
         INIT_LIST_HEAD (&fdctx->locks_list);
 
@@ -66,7 +66,7 @@ pl_check_n_create_fdctx (xlator_t *this, fd_t *fd)
         uint64_t    tmp   = 0;
         pl_fdctx_t *fdctx = NULL;
 
-        GF_VALIDATE_OR_GOTO (POSIX_LOCKS, this, out);
+        GF_VALIDATE_OR_GOTO ("posix-locks", this, out);
         GF_VALIDATE_OR_GOTO (this->name, fd, out);
 
         LOCK (&fd->lock);
@@ -119,7 +119,7 @@ pl_truncate_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
 
 static int
 truncate_allowed (pl_inode_t *pl_inode,
-                  void *transport, pid_t client_pid,
+                  client_t *client, pid_t client_pid,
                   gf_lkowner_t *owner, off_t offset)
 {
         posix_lock_t *l = NULL;
@@ -128,7 +128,7 @@ truncate_allowed (pl_inode_t *pl_inode,
 
         region.fl_start   = offset;
         region.fl_end     = LLONG_MAX;
-        region.transport  = transport;
+        region.client     = client;
         region.client_pid = client_pid;
         region.owner      = *owner;
 
@@ -139,7 +139,7 @@ truncate_allowed (pl_inode_t *pl_inode,
                             && locks_overlap (&region, l)
                             && !same_owner (&region, l)) {
                                 ret = 0;
-                                gf_log (POSIX_LOCKS, GF_LOG_TRACE, "Truncate "
+                                gf_log ("posix-locks", GF_LOG_TRACE, "Truncate "
                                         "allowed");
                                 break;
                         }
@@ -186,7 +186,7 @@ truncate_stat_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
 
         if (priv->mandatory
             && pl_inode->mandatory
-            && !truncate_allowed (pl_inode, frame->root->trans,
+            && !truncate_allowed (pl_inode, frame->root->client,
                                   frame->root->pid, &frame->root->lk_owner,
                                   local->offset)) {
                 op_ret   = -1;
@@ -347,7 +347,7 @@ delete_locks_of_fd (xlator_t *this, pl_inode_t *pl_inode, fd_t *fd)
 
 static void
 __delete_locks_of_owner (pl_inode_t *pl_inode,
-                         void *transport, gf_lkowner_t *owner)
+                         client_t *client, gf_lkowner_t *owner)
 {
         posix_lock_t *tmp = NULL;
         posix_lock_t *l = NULL;
@@ -357,7 +357,7 @@ __delete_locks_of_owner (pl_inode_t *pl_inode,
         list_for_each_entry_safe (l, tmp, &pl_inode->ext_list, list) {
                 if (l->blocked)
                         continue;
-                if ((l->transport == transport) &&
+                if ((l->client == client) &&
                     is_same_lkowner (&l->owner, owner)) {
                         gf_log ("posix-locks", GF_LOG_TRACE,
                                 " Flushing lock"
@@ -810,7 +810,7 @@ pl_migrate_locks (call_frame_t *frame, fd_t *newfd, uint64_t oldfd_num,
                 list_for_each_entry (l, &pl_inode->ext_list, list) {
                         if (l->fd_num == oldfd_num) {
                                 l->fd_num = newfd_num;
-                                l->transport = frame->root->trans;
+                                l->client = frame->root->client;
                         }
                 }
         }
@@ -983,7 +983,7 @@ pl_flush (call_frame_t *frame, xlator_t *this,
         }
         pthread_mutex_lock (&pl_inode->mutex);
         {
-                __delete_locks_of_owner (pl_inode, frame->root->trans,
+                __delete_locks_of_owner (pl_inode, frame->root->client,
                                          &frame->root->lk_owner);
         }
         pthread_mutex_unlock (&pl_inode->mutex);
@@ -1178,7 +1178,7 @@ pl_readv (call_frame_t *frame, xlator_t *this,
         if (priv->mandatory && pl_inode->mandatory) {
                 region.fl_start   = offset;
                 region.fl_end     = offset + size - 1;
-                region.transport  = frame->root->trans;
+                region.client     = frame->root->client;
                 region.fd_num     = fd_to_fdnum(fd);
                 region.client_pid = frame->root->pid;
                 region.owner      = frame->root->lk_owner;
@@ -1272,7 +1272,7 @@ pl_writev (call_frame_t *frame, xlator_t *this, fd_t *fd,
         if (priv->mandatory && pl_inode->mandatory) {
                 region.fl_start   = offset;
                 region.fl_end     = offset + iov_length (vector, count) - 1;
-                region.transport  = frame->root->trans;
+                region.client     = frame->root->client;
                 region.fd_num     = fd_to_fdnum(fd);
                 region.client_pid = frame->root->pid;
                 region.owner      = frame->root->lk_owner;
@@ -1353,7 +1353,7 @@ lock_dup (posix_lock_t *lock)
 {
         posix_lock_t *new_lock = NULL;
 
-        new_lock = new_posix_lock (&lock->user_flock, lock->transport,
+        new_lock = new_posix_lock (&lock->user_flock, lock->client,
                                    lock->client_pid, &lock->owner,
                                    (fd_t *)lock->fd_num);
         return new_lock;
@@ -1513,8 +1513,6 @@ int
 pl_lk (call_frame_t *frame, xlator_t *this,
        fd_t *fd, int32_t cmd, struct gf_flock *flock, dict_t *xdata)
 {
-        void         *transport  = NULL;
-        pid_t         client_pid = 0;
         pl_inode_t   *pl_inode   = NULL;
         int           op_ret     = 0;
         int           op_errno   = 0;
@@ -1523,9 +1521,6 @@ pl_lk (call_frame_t *frame, xlator_t *this,
         posix_lock_t *conf       = NULL;
         int           ret        = 0;
 
-        transport  = frame->root->trans;
-        client_pid = frame->root->pid;
-
         if ((flock->l_start < 0) || (flock->l_len < 0)) {
                 op_ret = -1;
                 op_errno = EINVAL;
@@ -1539,7 +1534,7 @@ pl_lk (call_frame_t *frame, xlator_t *this,
                 goto unwind;
         }
 
-        reqlock = new_posix_lock (flock, transport, client_pid,
+        reqlock = new_posix_lock (flock, frame->root->client, frame->root->pid,
                                   &frame->root->lk_owner, fd);
 
         if (!reqlock) {
@@ -1764,6 +1759,7 @@ pl_forget (xlator_t *this,
                                         list_del_init (&entry_l->domain_list);
 
                                         GF_FREE ((char *)entry_l->basename);
+                                        GF_FREE (entry_l->connection_id);
                                         GF_FREE (entry_l);
                                 }
 
@@ -1797,6 +1793,7 @@ pl_forget (xlator_t *this,
 
                 STACK_UNWIND_STRICT (entrylk, entry_l->frame, -1, 0, NULL);
                 GF_FREE ((char *)entry_l->basename);
+                GF_FREE (entry_l->connection_id);
                 GF_FREE (entry_l);
 
         }
@@ -1946,19 +1943,34 @@ pl_entrylk_xattr_fill (xlator_t *this, inode_t *inode,
 }
 
 void
-pl_inodelk_xattr_fill (xlator_t *this, inode_t *inode,
-                       dict_t *dict)
+pl_inodelk_xattr_fill (xlator_t *this, inode_t *inode, dict_t *dict,
+                       gf_boolean_t per_dom)
 {
         int32_t     count = 0;
         int         ret   = -1;
+        char        *domname = NULL;
+
+
+        if (per_dom){
+                ret = dict_get_str (dict, GLUSTERFS_INODELK_DOM_COUNT,
+                                    &domname);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR, "Failed to get "
+                                "value for key %s",GLUSTERFS_INODELK_DOM_COUNT);
+                        goto out;
+                }
+        }
+
+        count = get_inodelk_count (this, inode, domname);
 
-        count = get_inodelk_count (this, inode);
         ret = dict_set_int32 (dict, GLUSTERFS_INODELK_COUNT, count);
         if (ret < 0) {
-                gf_log (this->name, GF_LOG_DEBUG,
-                        " dict_set failed on key %s", GLUSTERFS_INODELK_COUNT);
+                gf_log (this->name, GF_LOG_DEBUG, "Failed to set count for "
+                        "key %s", GLUSTERFS_INODELK_COUNT);
         }
 
+out:
+        return;
 }
 
 void
@@ -2003,7 +2015,9 @@ pl_lookup_cbk (call_frame_t *frame,
         if (local->entrylk_count_req)
                 pl_entrylk_xattr_fill (this, inode, xdata);
         if (local->inodelk_count_req)
-                pl_inodelk_xattr_fill (this, inode, xdata);
+                pl_inodelk_xattr_fill (this, inode, xdata, _gf_false);
+        if (local->inodelk_dom_count_req)
+                pl_inodelk_xattr_fill (this, inode, xdata, _gf_true);
         if (local->posixlk_count_req)
                 pl_posixlk_xattr_fill (this, inode, xdata);
 
@@ -2050,6 +2064,8 @@ pl_lookup (call_frame_t *frame,
                         local->entrylk_count_req = 1;
                 if (dict_get (xdata, GLUSTERFS_INODELK_COUNT))
                         local->inodelk_count_req = 1;
+                if (dict_get (xdata, GLUSTERFS_INODELK_DOM_COUNT))
+                        local->inodelk_dom_count_req = 1;
                 if (dict_get (xdata, GLUSTERFS_POSIXLK_COUNT))
                         local->posixlk_count_req = 1;
                 if (dict_get (xdata, GLUSTERFS_PARENT_ENTRYLK))
@@ -2088,7 +2104,11 @@ pl_readdirp_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                 if (local->entrylk_count_req)
                         pl_entrylk_xattr_fill (this, entry->inode, entry->dict);
                 if (local->inodelk_count_req)
-                        pl_inodelk_xattr_fill (this, entry->inode, entry->dict);
+                        pl_inodelk_xattr_fill (this, entry->inode, entry->dict,
+                                               _gf_false);
+                if (local->inodelk_dom_count_req)
+                        pl_inodelk_xattr_fill (this, entry->inode, entry->dict,
+                                               _gf_true);
                 if (local->posixlk_count_req)
                         pl_posixlk_xattr_fill (this, entry->inode, entry->dict);
         }
@@ -2117,6 +2137,8 @@ pl_readdirp (call_frame_t *frame, xlator_t *this, fd_t *fd, size_t size,
                         local->entrylk_count_req = 1;
                 if (dict_get (dict, GLUSTERFS_INODELK_COUNT))
                         local->inodelk_count_req = 1;
+                if (dict_get (dict, GLUSTERFS_INODELK_DOM_COUNT))
+                        local->inodelk_dom_count_req = 1;
                 if (dict_get (dict, GLUSTERFS_POSIXLK_COUNT))
                         local->posixlk_count_req = 1;
         }
@@ -2136,8 +2158,8 @@ out:
 
 void
 pl_dump_lock (char *str, int size, struct gf_flock *flock,
-              gf_lkowner_t *owner, void *trans, time_t *granted_time,
-              time_t *blkd_time, gf_boolean_t active)
+              gf_lkowner_t *owner, void *trans, char *conn_id,
+              time_t *granted_time, time_t *blkd_time, gf_boolean_t active)
 {
         char  *type_str    = NULL;
         char   granted[32] = {0,};
@@ -2165,7 +2187,7 @@ pl_dump_lock (char *str, int size, struct gf_flock *flock,
                                   (unsigned long long) flock->l_start,
                                   (unsigned long long) flock->l_len,
                                   (unsigned long long) flock->l_pid,
-                                  lkowner_utoa (owner), trans,
+                                  lkowner_utoa (owner), trans, conn_id,
                                   ctime_r (granted_time, granted));
                 } else {
                         snprintf (str, size, RANGE_BLKD_GRNTD_FMT,
@@ -2173,7 +2195,7 @@ pl_dump_lock (char *str, int size, struct gf_flock *flock,
                                   (unsigned long long) flock->l_start,
                                   (unsigned long long) flock->l_len,
                                   (unsigned long long) flock->l_pid,
-                                  lkowner_utoa (owner), trans,
+                                  lkowner_utoa (owner), trans, conn_id,
                                   ctime_r (blkd_time, blocked),
                                   ctime_r (granted_time, granted));
                 }
@@ -2184,7 +2206,7 @@ pl_dump_lock (char *str, int size, struct gf_flock *flock,
                           (unsigned long long) flock->l_start,
                           (unsigned long long) flock->l_len,
                           (unsigned long long) flock->l_pid,
-                          lkowner_utoa (owner), trans,
+                          lkowner_utoa (owner), trans, conn_id,
                           ctime_r (blkd_time, blocked));
         }
 
@@ -2222,6 +2244,7 @@ __dump_entrylks (pl_inode_t *pl_inode)
                                           "ENTRYLK_WRLCK", lock->basename,
                                           (unsigned long long) lock->client_pid,
                                           lkowner_utoa (&lock->owner), lock->trans,
+                                          lock->connection_id,
                                           ctime_r (&lock->granted_time.tv_sec, granted));
                         } else {
                                 snprintf (tmp, 256, ENTRY_BLKD_GRNTD_FMT,
@@ -2229,6 +2252,7 @@ __dump_entrylks (pl_inode_t *pl_inode)
                                           "ENTRYLK_WRLCK", lock->basename,
                                           (unsigned long long) lock->client_pid,
                                           lkowner_utoa (&lock->owner), lock->trans,
+                                          lock->connection_id,
                                           ctime_r (&lock->blkd_time.tv_sec, blocked),
                                           ctime_r (&lock->granted_time.tv_sec, granted));
                         }
@@ -2248,6 +2272,7 @@ __dump_entrylks (pl_inode_t *pl_inode)
                                   "ENTRYLK_WRLCK", lock->basename,
                                   (unsigned long long) lock->client_pid,
                                   lkowner_utoa (&lock->owner), lock->trans,
+                                  lock->connection_id,
                                   ctime_r (&lock->blkd_time.tv_sec, blocked));
 
                         gf_proc_dump_write(key, tmp);
@@ -2298,7 +2323,7 @@ __dump_inodelks (pl_inode_t *pl_inode)
                         SET_FLOCK_PID (&lock->user_flock, lock);
                         pl_dump_lock (tmp, 256, &lock->user_flock,
                                       &lock->owner,
-                                      lock->transport,
+                                      lock->client, lock->connection_id,
                                       &lock->granted_time.tv_sec,
                                       &lock->blkd_time.tv_sec,
                                       _gf_true);
@@ -2315,7 +2340,7 @@ __dump_inodelks (pl_inode_t *pl_inode)
                         SET_FLOCK_PID (&lock->user_flock, lock);
                         pl_dump_lock (tmp, 256, &lock->user_flock,
                                       &lock->owner,
-                                      lock->transport,
+                                      lock->client, lock->connection_id,
                                       0, &lock->blkd_time.tv_sec,
                                       _gf_false);
                         gf_proc_dump_write(key, tmp);
@@ -2356,7 +2381,7 @@ __dump_posixlks (pl_inode_t *pl_inode)
                                      count,
                                      lock->blocked ? "BLOCKED" : "ACTIVE");
               pl_dump_lock (tmp, 256, &lock->user_flock,
-                            &lock->owner, lock->transport,
+                            &lock->owner, lock->client, NULL,
                             &lock->granted_time.tv_sec, &lock->blkd_time.tv_sec,
                             (lock->blocked)? _gf_false: _gf_true);
               gf_proc_dump_write(key, tmp);
@@ -2433,7 +2458,7 @@ unlock:
                         __dump_entrylks (pl_inode);
                 }
 
-                count = __get_inodelk_count (this, pl_inode);
+                count = __get_inodelk_count (this, pl_inode, NULL);
                 if (count) {
                         gf_proc_dump_write("inodelk-count", "%d", count);
                         __dump_inodelks (pl_inode);
@@ -2480,6 +2505,124 @@ mem_acct_init (xlator_t *this)
         return ret;
 }
 
+
+pl_ctx_t*
+pl_ctx_get (client_t *client, xlator_t *xlator)
+{
+        void *tmp = NULL;
+        pl_ctx_t *ctx = NULL;
+
+        client_ctx_get (client, xlator, &tmp);
+
+        ctx = tmp;
+
+        if (ctx != NULL)
+                goto out;
+
+        ctx = GF_CALLOC (1, sizeof (pl_ctx_t), gf_locks_mt_posix_lock_t);
+
+        if (ctx == NULL)
+                goto out;
+
+        ctx->ltable = pl_lock_table_new();
+
+        if (ctx->ltable == NULL) {
+                GF_FREE (ctx);
+                ctx = NULL;
+                goto out;
+        }
+
+        LOCK_INIT (&ctx->ltable_lock);
+
+        if (client_ctx_set (client, xlator, ctx) != 0) {
+                LOCK_DESTROY (&ctx->ltable_lock);
+                GF_FREE (ctx->ltable);
+                GF_FREE (ctx);
+                ctx = NULL;
+        }
+out:
+        return ctx;
+}
+
+static void
+ltable_delete_locks (struct _lock_table *ltable)
+{
+        struct _locker *locker = NULL;
+        struct _locker *tmp    = NULL;
+
+        list_for_each_entry_safe (locker, tmp, &ltable->inodelk_lockers, lockers) {
+                if (locker->fd)
+                        pl_del_locker (ltable, locker->volume, &locker->loc,
+                                       locker->fd, &locker->owner,
+                                       GF_FOP_INODELK);
+                GF_FREE (locker->volume);
+                GF_FREE (locker);
+        }
+
+        list_for_each_entry_safe (locker, tmp, &ltable->entrylk_lockers, lockers) {
+                if (locker->fd)
+                        pl_del_locker (ltable, locker->volume, &locker->loc,
+                                       locker->fd, &locker->owner,
+                                       GF_FOP_ENTRYLK);
+                GF_FREE (locker->volume);
+                GF_FREE (locker);
+        }
+        GF_FREE (ltable);
+}
+
+
+static int32_t
+destroy_cbk (xlator_t *this, client_t *client)
+{
+        void     *tmp       = NULL;
+        pl_ctx_t *locks_ctx = NULL;
+
+        client_ctx_del (client, this, &tmp);
+
+        if (tmp == NULL)
+                return 0
+;
+        locks_ctx = tmp;
+        if (locks_ctx->ltable)
+                ltable_delete_locks (locks_ctx->ltable);
+
+        LOCK_DESTROY (&locks_ctx->ltable_lock);
+        GF_FREE (locks_ctx);
+
+        return 0;
+}
+
+
+static int32_t
+disconnect_cbk (xlator_t *this, client_t *client)
+{
+        int32_t              ret       = 0;
+        pl_ctx_t            *locks_ctx = NULL;
+        struct _lock_table  *ltable    = NULL;
+
+        locks_ctx = pl_ctx_get (client, this);
+        if (locks_ctx == NULL) {
+                gf_log (this->name, GF_LOG_INFO, "pl_ctx_get() failed");
+                goto out;
+        }
+
+        LOCK (&locks_ctx->ltable_lock);
+        {
+                if (locks_ctx->ltable) {
+                        ltable = locks_ctx->ltable;
+                        locks_ctx->ltable = pl_lock_table_new ();
+                }
+        }
+        UNLOCK (&locks_ctx->ltable_lock);
+
+        if (ltable)
+                ltable_delete_locks (ltable);
+
+out:
+        return ret;
+}
+
+
 int
 init (xlator_t *this)
 {
@@ -2508,7 +2651,7 @@ init (xlator_t *this)
                 gf_log (this->name, GF_LOG_CRITICAL,
                         "'locks' translator is not loaded over a storage "
                         "translator");
-                goto out;;
+                goto out;
         }
 
         priv = GF_CALLOC (1, sizeof (*priv),
@@ -2610,9 +2753,11 @@ struct xlator_dumpops dumpops = {
 };
 
 struct xlator_cbks cbks = {
-        .forget      = pl_forget,
-        .release     = pl_release,
-        .releasedir  = pl_releasedir,
+        .forget            = pl_forget,
+        .release           = pl_release,
+        .releasedir        = pl_releasedir,
+        .client_destroy    = destroy_cbk,
+        .client_disconnect = disconnect_cbk,
 };
 
 
diff --git a/xlators/features/marker/Makefile.am b/xlators/features/marker/Makefile.am
index a6ba2de16..a985f42a8 100644
--- a/xlators/features/marker/Makefile.am
+++ b/xlators/features/marker/Makefile.am
@@ -1,3 +1,3 @@
-SUBDIRS = src @SYNCDAEMON_SUBDIR@
+SUBDIRS = src
 
 CLEANFILES =
diff --git a/xlators/features/marker/src/marker.c b/xlators/features/marker/src/marker.c
index 6c68167d8..6a2c85691 100644
--- a/xlators/features/marker/src/marker.c
+++ b/xlators/features/marker/src/marker.c
@@ -146,12 +146,21 @@ out:
 }
 
 int32_t
-marker_error_handler (xlator_t *this)
+marker_error_handler (xlator_t *this, marker_local_t *local, int32_t op_errno)
 {
-        marker_conf_t *priv = NULL;
+         marker_conf_t *priv = NULL;
+         const char    *path = NULL;
 
-        priv = (marker_conf_t *) this->private;
+         priv = (marker_conf_t *) this->private;
+         path = local
+                 ? (local->loc.path
+                    ? local->loc.path : uuid_utoa(local->loc.gfid))
+                 : "<nul>";
 
+         gf_log (this->name, GF_LOG_CRITICAL,
+                 "Indexing gone corrupt at %s (reason: %s)."
+                 " Geo-replication slave content needs to be revalidated",
+                 path, strerror (op_errno));
         unlink (priv->timestamp_file);
 
         return 0;
@@ -176,6 +185,8 @@ marker_local_unref (marker_local_t *local)
 
         loc_wipe (&local->loc);
         loc_wipe (&local->parent_loc);
+        if (local->xdata)
+                dict_unref (local->xdata);
 
         if (local->oplocal) {
                 marker_local_unref (local->oplocal);
@@ -345,7 +356,7 @@ marker_specific_setxattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
         local = (marker_local_t*) frame->local;
 
         if (op_ret == -1 && op_errno == ENOSPC) {
-                marker_error_handler (this);
+                marker_error_handler (this, local, op_errno);
                 done = 1;
                 goto out;
         }
@@ -457,11 +468,16 @@ marker_create_frame (xlator_t *this, marker_local_t *local)
 int32_t
 marker_xtime_update_marks (xlator_t *this, marker_local_t *local)
 {
+        marker_conf_t *priv = NULL;
+
         GF_VALIDATE_OR_GOTO ("marker", this, out);
         GF_VALIDATE_OR_GOTO (this->name, local, out);
 
-        if ((local->pid == GF_CLIENT_PID_GSYNCD) ||
-            (local->pid == GF_CLIENT_PID_DEFRAG))
+        priv = this->private;
+
+        if ((local->pid == GF_CLIENT_PID_GSYNCD
+             && !(priv->feature_enabled & GF_XTIME_GSYNC_FORCE))
+            || (local->pid == GF_CLIENT_PID_DEFRAG))
                 goto out;
 
         marker_gettimeofday (local);
@@ -824,7 +840,7 @@ marker_unlink_stat_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
 
         STACK_WIND (frame, marker_unlink_cbk, FIRST_CHILD(this),
                     FIRST_CHILD(this)->fops->unlink, &local->loc, local->xflag,
-                    NULL);
+                    local->xdata);
         return 0;
 err:
         frame->local = NULL;
@@ -849,6 +865,8 @@ marker_unlink (call_frame_t *frame, xlator_t *this, loc_t *loc, int xflag,
 
         local = mem_get0 (this->local_pool);
         local->xflag = xflag;
+        if (xdata)
+                local->xdata = dict_ref (xdata);
         MARKER_INIT_LOCAL (frame, local);
 
         ret = loc_copy (&local->loc, loc);
@@ -1799,6 +1817,210 @@ err:
 }
 
 
+int32_t
+marker_fallocate_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                      int32_t op_ret, int32_t op_errno, struct iatt *prebuf,
+                      struct iatt *postbuf, dict_t *xdata)
+{
+        marker_local_t     *local   = NULL;
+        marker_conf_t      *priv    = NULL;
+
+        if (op_ret == -1) {
+                gf_log (this->name, GF_LOG_TRACE, "%s occurred while "
+                        "fallocating a file ", strerror (op_errno));
+        }
+
+        local = (marker_local_t *) frame->local;
+
+        frame->local = NULL;
+
+        STACK_UNWIND_STRICT (fallocate, frame, op_ret, op_errno, prebuf,
+                             postbuf, xdata);
+
+        if (op_ret == -1 || local == NULL)
+                goto out;
+
+        priv = this->private;
+
+        if (priv->feature_enabled & GF_QUOTA)
+                mq_initiate_quota_txn (this, &local->loc);
+
+        if (priv->feature_enabled & GF_XTIME)
+                marker_xtime_update_marks (this, local);
+out:
+        marker_local_unref (local);
+
+        return 0;
+}
+
+int32_t
+marker_fallocate(call_frame_t *frame, xlator_t *this, fd_t *fd, int32_t mode,
+		 off_t offset, size_t len, dict_t *xdata)
+{
+        int32_t          ret   = 0;
+        marker_local_t  *local = NULL;
+        marker_conf_t   *priv  = NULL;
+
+        priv = this->private;
+
+        if (priv->feature_enabled == 0)
+                goto wind;
+
+        local = mem_get0 (this->local_pool);
+
+        MARKER_INIT_LOCAL (frame, local);
+
+        ret = marker_inode_loc_fill (fd->inode, &local->loc);
+
+        if (ret == -1)
+                goto err;
+wind:
+        STACK_WIND (frame, marker_fallocate_cbk, FIRST_CHILD(this),
+                    FIRST_CHILD(this)->fops->fallocate, fd, mode, offset, len,
+		    xdata);
+        return 0;
+err:
+        STACK_UNWIND_STRICT (fallocate, frame, -1, ENOMEM, NULL, NULL, NULL);
+
+        return 0;
+}
+
+
+int32_t
+marker_discard_cbk(call_frame_t *frame, void *cookie, xlator_t *this,
+                   int32_t op_ret, int32_t op_errno, struct iatt *prebuf,
+                   struct iatt *postbuf, dict_t *xdata)
+{
+        marker_local_t     *local   = NULL;
+        marker_conf_t      *priv    = NULL;
+
+        if (op_ret == -1) {
+                gf_log (this->name, GF_LOG_TRACE, "%s occurred during discard",
+                        strerror (op_errno));
+        }
+
+        local = (marker_local_t *) frame->local;
+
+        frame->local = NULL;
+
+        STACK_UNWIND_STRICT (discard, frame, op_ret, op_errno, prebuf,
+                             postbuf, xdata);
+
+        if (op_ret == -1 || local == NULL)
+                goto out;
+
+        priv = this->private;
+
+        if (priv->feature_enabled & GF_QUOTA)
+                mq_initiate_quota_txn (this, &local->loc);
+
+        if (priv->feature_enabled & GF_XTIME)
+                marker_xtime_update_marks (this, local);
+out:
+        marker_local_unref (local);
+
+        return 0;
+}
+
+int32_t
+marker_discard(call_frame_t *frame, xlator_t *this, fd_t *fd, off_t offset,
+	       size_t len, dict_t *xdata)
+{
+        int32_t          ret   = 0;
+        marker_local_t  *local = NULL;
+        marker_conf_t   *priv  = NULL;
+
+        priv = this->private;
+
+        if (priv->feature_enabled == 0)
+                goto wind;
+
+        local = mem_get0 (this->local_pool);
+
+        MARKER_INIT_LOCAL (frame, local);
+
+        ret = marker_inode_loc_fill (fd->inode, &local->loc);
+
+        if (ret == -1)
+                goto err;
+wind:
+        STACK_WIND (frame, marker_discard_cbk, FIRST_CHILD(this),
+                    FIRST_CHILD(this)->fops->discard, fd, offset, len, xdata);
+        return 0;
+err:
+        STACK_UNWIND_STRICT (discard, frame, -1, ENOMEM, NULL, NULL, NULL);
+
+        return 0;
+}
+
+int32_t
+marker_zerofill_cbk(call_frame_t *frame, void *cookie, xlator_t *this,
+                   int32_t op_ret, int32_t op_errno, struct iatt *prebuf,
+                   struct iatt *postbuf, dict_t *xdata)
+{
+        marker_local_t     *local   = NULL;
+        marker_conf_t      *priv    = NULL;
+
+        if (op_ret == -1) {
+                gf_log (this->name, GF_LOG_TRACE, "%s occurred during zerofill",
+                        strerror (op_errno));
+        }
+
+        local = (marker_local_t *) frame->local;
+
+        frame->local = NULL;
+
+        STACK_UNWIND_STRICT (zerofill, frame, op_ret, op_errno, prebuf,
+                             postbuf, xdata);
+
+        if (op_ret == -1 || local == NULL)
+                goto out;
+
+        priv = this->private;
+
+        if (priv->feature_enabled & GF_QUOTA)
+                mq_initiate_quota_txn (this, &local->loc);
+
+        if (priv->feature_enabled & GF_XTIME)
+                marker_xtime_update_marks (this, local);
+out:
+        marker_local_unref (local);
+
+        return 0;
+}
+
+int32_t
+marker_zerofill(call_frame_t *frame, xlator_t *this, fd_t *fd, off_t offset,
+               size_t len, dict_t *xdata)
+{
+        int32_t          ret   = 0;
+        marker_local_t  *local = NULL;
+        marker_conf_t   *priv  = NULL;
+
+        priv = this->private;
+
+        if (priv->feature_enabled == 0)
+                goto wind;
+
+        local = mem_get0 (this->local_pool);
+
+        MARKER_INIT_LOCAL (frame, local);
+
+        ret = marker_inode_loc_fill (fd->inode, &local->loc);
+
+        if (ret == -1)
+                goto err;
+wind:
+        STACK_WIND (frame, marker_zerofill_cbk, FIRST_CHILD(this),
+                    FIRST_CHILD(this)->fops->zerofill, fd, offset, len, xdata);
+        return 0;
+err:
+        STACK_UNWIND_STRICT (zerofill, frame, -1, ENOMEM, NULL, NULL, NULL);
+
+        return 0;
+}
+
+
 /* when a call from the special client is received on
  * key trusted.glusterfs.volume-mark with value "RESET"
  * or if the value is 0length, update the change the
@@ -2443,7 +2665,7 @@ out:
 int32_t
 reconfigure (xlator_t *this, dict_t *options)
 {
-        int32_t         ret     = -1;
+        int32_t         ret     = 0;
         data_t         *data    = NULL;
         gf_boolean_t    flag    = _gf_false;
         marker_conf_t  *priv    = NULL;
@@ -2484,11 +2706,17 @@ reconfigure (xlator_t *this, dict_t *options)
                                         "xtime updation will fail");
                         } else {
                                 priv->feature_enabled |= GF_XTIME;
+                                data = dict_get (options, "gsync-force-xtime");
+                                if (!data)
+                                        goto out;
+                                ret = gf_string2boolean (data->data, &flag);
+                                if (ret == 0 && flag)
+                                        priv->feature_enabled |= GF_XTIME_GSYNC_FORCE;
                         }
                 }
         }
 out:
-        return 0;
+        return ret;
 }
 
 
@@ -2544,9 +2772,16 @@ init (xlator_t *this)
                                 goto err;
 
                         priv->feature_enabled |= GF_XTIME;
+                        data = dict_get (options, "gsync-force-xtime");
+                        if (!data)
+                                goto cont;
+                        ret = gf_string2boolean (data->data, &flag);
+                        if (ret == 0 && flag)
+                                priv->feature_enabled |= GF_XTIME_GSYNC_FORCE;
                 }
         }
 
+ cont:
         this->local_pool = mem_pool_new (marker_local_t, 128);
         if (!this->local_pool) {
                 gf_log (this->name, GF_LOG_ERROR,
@@ -2608,6 +2843,9 @@ struct xlator_fops fops = {
         .removexattr = marker_removexattr,
         .getxattr    = marker_getxattr,
         .readdirp    = marker_readdirp,
+	.fallocate   = marker_fallocate,
+	.discard     = marker_discard,
+        .zerofill    = marker_zerofill,
 };
 
 struct xlator_cbks cbks = {
@@ -2619,5 +2857,6 @@ struct volume_options options[] = {
         {.key = {"timestamp-file"}},
         {.key = {"quota"}},
         {.key = {"xtime"}},
+        {.key = {"gsync-force-xtime"}},
         {.key = {NULL}}
 };
diff --git a/xlators/features/marker/src/marker.h b/xlators/features/marker/src/marker.h
index 63491ab37..1a58f8cfc 100644
--- a/xlators/features/marker/src/marker.h
+++ b/xlators/features/marker/src/marker.h
@@ -28,8 +28,9 @@
 #define TIMESTAMP_FILE      "timestamp-file"
 
 enum {
-        GF_QUOTA=1,
-        GF_XTIME=2
+        GF_QUOTA             = 1,
+        GF_XTIME             = 2,
+        GF_XTIME_GSYNC_FORCE = 4,
 };
 
 /*initialize the local variable*/
@@ -110,6 +111,7 @@ struct marker_local{
         inode_contribution_t *contri;
 
         int xflag;
+        dict_t *xdata;
 };
 typedef struct marker_local marker_local_t;
 
diff --git a/xlators/features/marker/utils/Makefile.am b/xlators/features/marker/utils/Makefile.am
deleted file mode 100644
index 556951d9f..000000000
--- a/xlators/features/marker/utils/Makefile.am
+++ /dev/null
@@ -1,3 +0,0 @@
-SUBDIRS = syncdaemon src
-
-CLEANFILES =
diff --git a/xlators/features/marker/utils/src/Makefile.am b/xlators/features/marker/utils/src/Makefile.am
deleted file mode 100644
index 9e410cda6..000000000
--- a/xlators/features/marker/utils/src/Makefile.am
+++ /dev/null
@@ -1,26 +0,0 @@
-gsyncddir = $(libexecdir)/glusterfs
-
-gsyncd_PROGRAMS = gsyncd
-
-gsyncd_SOURCES = gsyncd.c procdiggy.c
-
-gsyncd_LDADD = $(top_builddir)/libglusterfs/src/libglusterfs.la \
-	$(GF_GLUSTERFS_LIBS)
-
-gsyncd_LDFLAGS = $(GF_LDFLAGS)
-
-noinst_HEADERS = procdiggy.h
-
-AM_CPPFLAGS = $(GF_CPPFLAGS) \
-	-I$(top_srcdir)/libglusterfs/src\
-	-DGSYNCD_PREFIX=\"$(libexecdir)/glusterfs\"\
-	-DUSE_LIBGLUSTERFS\
-	-DSBIN_DIR=\"$(sbindir)\" -DPYTHON=\"$(PYTHON)\"
-
-AM_CFLAGS = -Wall $(GF_CFLAGS)
-
-
-CLEANFILES =
-
-$(top_builddir)/libglusterfs/src/libglusterfs.la:
-	$(MAKE) -C $(top_builddir)/libglusterfs/src/ all
diff --git a/xlators/features/marker/utils/src/gsyncd.c b/xlators/features/marker/utils/src/gsyncd.c
deleted file mode 100644
index 9c4a5bdff..000000000
--- a/xlators/features/marker/utils/src/gsyncd.c
+++ /dev/null
@@ -1,367 +0,0 @@
-/*
-   Copyright (c) 2011-2012 Red Hat, Inc. <http://www.redhat.com>
-   This file is part of GlusterFS.
-
-   This file is licensed to you under your choice of the GNU Lesser
-   General Public License, version 3 or any later version (LGPLv3 or
-   later), or the GNU General Public License, version 2 (GPLv2), in all
-   cases as published by the Free Software Foundation.
-*/
-
-#ifndef _CONFIG_H
-#define _CONFIG_H
-#include "config.h"
-#endif
-
-#include <stdlib.h>
-#include <stdio.h>
-#include <unistd.h>
-#include <string.h>
-#include <sys/param.h> /* for PATH_MAX */
-
-/* NOTE (USE_LIBGLUSTERFS):
- * ------------------------
- * When USE_LIBGLUSTERFS debugging sumbol is passed; perform
- * glusterfs translator like initialization so that glusterfs
- * globals, contexts are valid when glustefs api's are invoked.
- * We unconditionally pass then while building gsyncd binary.
- */
-#ifdef USE_LIBGLUSTERFS
-#include "glusterfs.h"
-#include "globals.h"
-#endif
-
-#include "common-utils.h"
-#include "run.h"
-#include "procdiggy.h"
-
-#define _GLUSTERD_CALLED_ "_GLUSTERD_CALLED_"
-#define _GSYNCD_DISPATCHED_ "_GSYNCD_DISPATCHED_"
-#define GSYNCD_CONF "geo-replication/gsyncd.conf"
-#define GSYNCD_PY "gsyncd.py"
-#define RSYNC "rsync"
-
-int restricted = 0;
-
-static int
-duplexpand (void **buf, size_t tsiz, size_t *len)
-{
-        size_t osiz = tsiz * *len;
-        char *p = realloc (*buf, osiz << 1);
-        if (!p) {
-                free(*buf);
-                return -1;
-        }
-
-        memset (p + osiz, 0, osiz);
-        *buf = p;
-        *len <<= 1;
-
-        return 0;
-}
-
-static int
-str2argv (char *str, char ***argv)
-{
-        char *p         = NULL;
-        char *savetok   = NULL;
-        int argc        = 0;
-        size_t argv_len = 32;
-        int ret         = 0;
-
-        assert (str);
-        str = strdup (str);
-        if (!str)
-                return -1;
-
-        *argv = calloc (argv_len, sizeof (**argv));
-        if (!*argv)
-                goto error;
-
-        while ((p = strtok_r (str, " ", &savetok))) {
-                str = NULL;
-
-                argc++;
-                if (argc == argv_len) {
-                        ret = duplexpand ((void *)argv,
-                                          sizeof (**argv),
-                                          &argv_len);
-                        if (ret == -1)
-                                goto error;
-                }
-                (*argv)[argc - 1] = p;
-        }
-
-        return argc;
-
- error:
-        fprintf (stderr, "out of memory\n");
-        return -1;
-}
-
-static int
-invoke_gsyncd (int argc, char **argv)
-{
-        char config_file[PATH_MAX] = {0,};
-        size_t gluster_workdir_len = 0;
-        runner_t runner            = {0,};
-        int i                      = 0;
-        int j                      = 0;
-        char *nargv[argc + 4];
-        char *python = NULL;
-
-        if (restricted) {
-                size_t len;
-                /* in restricted mode we forcibly use the system-wide config */
-                runinit (&runner);
-                runner_add_args (&runner, SBIN_DIR"/gluster",
-                                 "--log-file=-", "system::", "getwd",
-                                 NULL);
-                runner_redir (&runner, STDOUT_FILENO, RUN_PIPE);
-                if (runner_start (&runner) == 0 &&
-                    fgets (config_file, PATH_MAX,
-                           runner_chio (&runner, STDOUT_FILENO)) != NULL &&
-                    (len = strlen (config_file)) &&
-                    config_file[len - 1] == '\n' &&
-                    runner_end (&runner) == 0)
-                        gluster_workdir_len = len - 1;
-
-                if (gluster_workdir_len) {
-                        if (gluster_workdir_len + 1 + strlen (GSYNCD_CONF) + 1 >
-                            PATH_MAX)
-                                goto error;
-                        config_file[gluster_workdir_len] = '/';
-                        strcat (config_file, GSYNCD_CONF);
-                } else
-                        goto error;
-
-                if (setenv ("_GSYNCD_RESTRICTED_", "1", 1) == -1)
-                        goto error;
-        }
-
-        if (chdir ("/") == -1)
-                goto error;
-
-        j = 0;
-        python = getenv("PYTHON");
-        if(!python)
-                python = PYTHON;
-        nargv[j++] = python;
-        nargv[j++] = GSYNCD_PREFIX"/python/syncdaemon/"GSYNCD_PY;
-        for (i = 1; i < argc; i++)
-                nargv[j++] = argv[i];
-        if (config_file[0]) {
-                nargv[j++] = "-c";
-                nargv[j++] = config_file;
-        }
-        nargv[j++] = NULL;
-
-        execvp (python, nargv);
-
-        fprintf (stderr, "exec of '%s' failed\n", python);
-        return 127;
-
- error:
-        fprintf (stderr, "gsyncd initializaion failed\n");
-        return 1;
-}
-
-
-static int
-find_gsyncd (pid_t pid, pid_t ppid, char *name, void *data)
-{
-        char buf[NAME_MAX * 2] = {0,};
-        char path[PATH_MAX]    = {0,};
-        char *p                = NULL;
-        int zeros              = 0;
-        int ret                = 0;
-        int fd                 = -1;
-        pid_t *pida            = (pid_t *)data;
-
-        if (ppid != pida[0])
-                return 0;
-
-        sprintf (path, PROC"/%d/cmdline", pid);
-        fd = open (path, O_RDONLY);
-        if (fd == -1)
-                return 0;
-        ret = read (fd, buf, sizeof (buf));
-        close (fd);
-        if (ret == -1)
-                return 0;
-        for (zeros = 0, p = buf; zeros < 2 && p < buf + ret; p++)
-                zeros += !*p;
-
-        ret = 0;
-        switch (zeros) {
-        case 2:
-                if ((strcmp (basename (buf), basename (PYTHON)) ||
-                     strcmp (basename (buf + strlen (buf) + 1), GSYNCD_PY)) == 0) {
-                        ret = 1;
-                        break;
-                }
-                /* fallthrough */
-        case 1:
-                if (strcmp (basename (buf), GSYNCD_PY) == 0)
-                        ret = 1;
-        }
-
-        if (ret == 1) {
-                if (pida[1] != -1) {
-                        fprintf (stderr, GSYNCD_PY" sibling is not unique");
-                        return -1;
-                }
-                pida[1] = pid;
-        }
-
-        return 0;
-}
-
-static int
-invoke_rsync (int argc, char **argv)
-{
-        int i                  = 0;
-        char path[PATH_MAX]    = {0,};
-        pid_t pid              = -1;
-        pid_t ppid             = -1;
-        pid_t pida[]           = {-1, -1};
-        char *name             = NULL;
-        char buf[PATH_MAX + 1] = {0,};
-        int ret                = 0;
-
-        assert (argv[argc] == NULL);
-
-        if (argc < 2 || strcmp (argv[1], "--server") != 0)
-                goto error;
-
-        for (i = 2; i < argc && argv[i][0] == '-'; i++);
-
-        if (!(i == argc - 2 && strcmp (argv[i], ".") == 0 && argv[i + 1][0] == '/')) {
-                fprintf (stderr, "need an rsync invocation without protected args\n");
-                goto error;
-        }
-
-        /* look up sshd we are spawned from */
-        for (pid = getpid () ;; pid = ppid) {
-                ppid = pidinfo (pid, &name);
-                if (ppid < 0) {
-                        fprintf (stderr, "sshd ancestor not found\n");
-                        goto error;
-                }
-                if (strcmp (name, "sshd") == 0) {
-                        GF_FREE (name);
-                        break;
-                }
-                GF_FREE (name);
-        }
-        /* look up "ssh-sibling" gsyncd */
-        pida[0] = pid;
-        ret = prociter (find_gsyncd, pida);
-        if (ret == -1 || pida[1] == -1) {
-                fprintf (stderr, "gsyncd sibling not found\n");
-                goto error;
-        }
-        /* check if rsync target matches gsyncd target */
-        sprintf (path, PROC"/%d/cwd", pida[1]);
-        ret = readlink (path, buf, sizeof (buf));
-        if (ret == -1 || ret == sizeof (buf))
-                goto error;
-        if (strcmp (argv[argc - 1], "/") == 0 /* root dir cannot be a target */ ||
-            (strcmp (argv[argc - 1], path) /* match against gluster target */ &&
-             strcmp (argv[argc - 1], buf) /* match against file target */) != 0) {
-                fprintf (stderr, "rsync target does not match "GEOREP" session\n");
-                goto error;
-        }
-
-        argv[0] = RSYNC;
-
-        execvp (RSYNC, argv);
-
-        fprintf (stderr, "exec of "RSYNC" failed\n");
-        return 127;
-
- error:
-        fprintf (stderr, "disallowed "RSYNC" invocation\n");
-        return 1;
-}
-
-
-struct invocable {
-        char *name;
-        int (*invoker) (int argc, char **argv);
-};
-
-struct invocable invocables[] = {
-        { "rsync",  invoke_rsync  },
-        { "gsyncd", invoke_gsyncd },
-        { NULL, NULL}
-};
-
-int
-main (int argc, char **argv)
-{
-        char *evas          = NULL;
-        struct invocable *i = NULL;
-        char *b             = NULL;
-        char *sargv         = NULL;
-
-#ifdef USE_LIBGLUSTERFS
-        glusterfs_ctx_t *ctx = NULL;
-
-        ctx = glusterfs_ctx_new ();
-        if (!ctx)
-                return ENOMEM;
-
-        if (glusterfs_globals_init (ctx))
-                return 1;
-
-        THIS->ctx = ctx;
-#endif
-
-        evas = getenv (_GLUSTERD_CALLED_);
-        if (evas && strcmp (evas, "1") == 0)
-                /* OK, we know glusterd called us, no need to look for further config
-                 * ... altough this conclusion should not inherit to our children
-                 */
-                unsetenv (_GLUSTERD_CALLED_);
-        else {
-                /* we regard all gsyncd invocations unsafe
-                 * that do not come from glusterd and
-                 * therefore restrict it
-                 */
-                restricted = 1;
-
-                if (!getenv (_GSYNCD_DISPATCHED_)) {
-                        evas = getenv ("SSH_ORIGINAL_COMMAND");
-                        if (evas)
-                                sargv = evas;
-                        else {
-                                evas = getenv ("SHELL");
-                                if (evas && strcmp (basename (evas), "gsyncd") == 0 &&
-                                    argc == 3 && strcmp (argv[1], "-c") == 0)
-                                        sargv = argv[2];
-                        }
-                }
-
-        }
-
-        if (!(sargv && restricted))
-                return invoke_gsyncd (argc, argv);
-
-        argc = str2argv (sargv, &argv);
-        if (argc == -1 || setenv (_GSYNCD_DISPATCHED_, "1", 1) == -1) {
-                fprintf (stderr, "internal error\n");
-                return 1;
-        }
-
-        b = basename (argv[0]);
-        for (i = invocables; i->name; i++) {
-                if (strcmp (b, i->name) == 0)
-                        return i->invoker (argc, argv);
-        }
-
-        fprintf (stderr, "invoking %s in restricted SSH session is not allowed\n",
-                 b);
-
-        return 1;
-}
diff --git a/xlators/features/marker/utils/src/procdiggy.c b/xlators/features/marker/utils/src/procdiggy.c
deleted file mode 100644
index 1eba414c1..000000000
--- a/xlators/features/marker/utils/src/procdiggy.c
+++ /dev/null
@@ -1,121 +0,0 @@
-/*
-   Copyright (c) 2011-2012 Red Hat, Inc. <http://www.redhat.com>
-   This file is part of GlusterFS.
-
-   This file is licensed to you under your choice of the GNU Lesser
-   General Public License, version 3 or any later version (LGPLv3 or
-   later), or the GNU General Public License, version 2 (GPLv2), in all
-   cases as published by the Free Software Foundation.
-*/
-
-#ifndef _CONFIG_H
-#define _CONFIG_H
-#include "config.h"
-#endif
-
-#include <stdlib.h>
-#include <stdio.h>
-#include <unistd.h>
-#include <string.h>
-#include <ctype.h>
-#include <sys/param.h> /* for PATH_MAX */
-
-#include "common-utils.h"
-#include "procdiggy.h"
-
-pid_t
-pidinfo (pid_t pid, char **name)
-{
-        char buf[NAME_MAX * 2] = {0,};
-        FILE *f                = NULL;
-        char path[PATH_MAX]    = {0,};
-        char *p                = NULL;
-        int ret                = 0;
-
-        sprintf (path, PROC"/%d/status", pid);
-
-        f = fopen (path, "r");
-        if (!f)
-                return -1;
-
-        if (name)
-                *name = NULL;
-        for (;;) {
-                size_t len;
-                memset (buf, 0, sizeof (buf));
-                if (fgets (buf, sizeof (buf), f) == NULL ||
-                    (len = strlen (buf)) == 0 ||
-                    buf[len - 1] != '\n') {
-                        pid = -1;
-                        goto out;
-                }
-                buf[len - 1] = '\0';
-
-                if (name && !*name) {
-                        p = strtail (buf, "Name:");
-                        if (p) {
-                                while (isspace (*++p));
-                                *name = gf_strdup (p);
-                                if (!*name) {
-                                        pid = -2;
-                                        goto out;
-                                }
-                                continue;
-                        }
-                }
-
-                p = strtail (buf, "PPid:");
-                if (p)
-                        break;
-        }
-
-        while (isspace (*++p));
-        ret = gf_string2int (p, &pid);
-        if (ret == -1)
-                pid = -1;
-
- out:
-        fclose (f);
-        if (pid == -1 && name && *name)
-                GF_FREE (name);
-        if (pid == -2)
-                fprintf (stderr, "out of memory\n");
-        return pid;
-}
-
-int
-prociter (int (*proch) (pid_t pid, pid_t ppid, char *tmpname, void *data),
-          void *data)
-{
-        char *name        = NULL;
-        DIR *d            = NULL;
-        struct dirent *de = NULL;
-        pid_t pid         = -1;
-        pid_t ppid        = -1;
-        int ret           = 0;
-
-        d = opendir (PROC);
-        if (!d)
-                return -1;
-        while (errno = 0, de = readdir (d)) {
-                if (gf_string2int (de->d_name, &pid) != -1 && pid >= 0) {
-                        ppid = pidinfo (pid, &name);
-                        switch (ppid) {
-                        case -1: continue;
-                        case -2: ret = -1; break;
-                        }
-                        ret = proch (pid, ppid, name, data);
-                        GF_FREE (name);
-                        if (ret)
-                                break;
-                }
-        }
-        closedir (d);
-        if (!de && errno) {
-                fprintf (stderr, "failed to traverse "PROC" (%s)\n",
-                         strerror (errno));
-                ret = -1;
-        }
-
-        return ret;
-}
diff --git a/xlators/features/marker/utils/syncdaemon/Makefile.am b/xlators/features/marker/utils/syncdaemon/Makefile.am
deleted file mode 100644
index cc7cee102..000000000
--- a/xlators/features/marker/utils/syncdaemon/Makefile.am
+++ /dev/null
@@ -1,6 +0,0 @@
-syncdaemondir = $(libexecdir)/glusterfs/python/syncdaemon
-
-syncdaemon_PYTHON = gconf.py gsyncd.py __init__.py master.py README.md repce.py resource.py configinterface.py syncdutils.py monitor.py libcxattr.py \
-                    $(top_builddir)/contrib/ipaddr-py/ipaddr.py
-
-CLEANFILES =
diff --git a/xlators/features/marker/utils/syncdaemon/README.md b/xlators/features/marker/utils/syncdaemon/README.md
deleted file mode 100644
index d45006932..000000000
--- a/xlators/features/marker/utils/syncdaemon/README.md
+++ /dev/null
@@ -1,81 +0,0 @@
-gsycnd, the Gluster Syncdaemon
-==============================
-
-REQUIREMENTS
-------------
-
-_gsyncd_ is a program which can operate either in _master_ or in _slave_ mode.
-Requirements are categorized according to this.
-
-* supported OS is GNU/Linux
-* Python >= 2.5, or 2.4 with Ctypes (see below) (both)
-* OpenSSH >= 4.0 (master) / SSH2 compliant sshd (eg. openssh) (slave)
-* rsync (both)
-* glusterfs with marker support (master); glusterfs (optional on slave)
-* FUSE; for supported versions consult glusterfs
-
-INSTALLATION
-------------
-
-As of now, the supported way of operation is running from the source directory.
-
-If you use Python 2.4.x, you need to install the [Ctypes module](http://python.net/crew/theller/ctypes/).
-
-CONFIGURATION
--------------
-
-gsyncd tunables are a subset of the long command-line options; for listing them,
-type
-
-    gsyncd.py --help
-
-and see the long options up to "--config-file". (The leading double dash should be omitted;
-interim underscores and dashes are interchangeable.) The set of options bear some resemblance
-to those of glusterfs and rsync.
-
-The config file format matches the following syntax:
-
-      <option1>: <value1>
-      <option2>: <value2>
-      # comment
-
-By default (unless specified by the option `-c`), gsyncd looks for config file at _conf/gsyncd.conf_
-in the source tree.
-
-USAGE
------
-
-gsyncd is a utilitly for continous mirroring, ie. it mirrors master to slave incrementally.
-Assume we have a gluster volume _pop_ at localhost. We try to set up the following mirrors
-for it with gysncd:
-
-1. _/data/mirror_
-2. local gluster volume _yow_
-3. _/data/far_mirror_ at example.com
-4. gluster volume _moz_ at example.com
-
-The respective gsyncd invocations are (demoing some syntax sugaring):
-
-1.
-
-      gsyncd.py gluster://localhost:pop file:///data/mirror
-
-  or short form
-
-      gsyncd.py :pop /data/mirror
-
-2. `gsyncd :pop :yow`
-3.
-
-       gsyncd.py :pop ssh://example.com:/data/far_mirror
-
-  or short form
-
-       gsyncd.py :pop example.com:/data/far_mirror
-
-4. `gsyncd.py :pop example.com::moz`
-
-gsyncd has to be available on both sides; it's location on the remote side has to be specified
-via the "--remote-gsyncd" option (or "remote-gsyncd" config file parameter). (This option can also be
-used for setting options on the remote side, although the suggested mode of operation is to
-set parameters like log file / pid file in the configuration file.)
diff --git a/xlators/features/marker/utils/syncdaemon/__codecheck.py b/xlators/features/marker/utils/syncdaemon/__codecheck.py
deleted file mode 100644
index e3386afba..000000000
--- a/xlators/features/marker/utils/syncdaemon/__codecheck.py
+++ /dev/null
@@ -1,46 +0,0 @@
-import os
-import os.path
-import sys
-import tempfile
-import shutil
-
-ipd = tempfile.mkdtemp(prefix = 'codecheck-aux')
-
-try:
-    # add a fake ipaddr module, we don't want to
-    # deal with the real one (just test our code)
-    f = open(os.path.join(ipd, 'ipaddr.py'), 'w')
-    f.write("""
-class IPAddress(object):
-    pass
-class IPNetwork(list):
-    pass
-""")
-    f.close()
-    sys.path.append(ipd)
-
-    fl = os.listdir(os.path.dirname(sys.argv[0]) or '.')
-    fl.sort()
-    for f in fl:
-        if f[-3:] != '.py' or f[0] == '_':
-            continue
-        m = f[:-3]
-        sys.stdout.write('importing %s ...' %  m)
-        __import__(m)
-        print(' OK.')
-
-    def sys_argv_set(a):
-        sys.argv = sys.argv[:1] + a
-
-    gsyncd = sys.modules['gsyncd']
-    for a in [['--help'], ['--version'], ['--canonicalize-escape-url', '/foo']]:
-        print('>>> invoking program with args: %s' % ' '.join(a))
-        pid = os.fork()
-        if not pid:
-            sys_argv_set(a)
-            gsyncd.main()
-        _, r = os.waitpid(pid, 0)
-        if r:
-            raise RuntimeError('invocation failed')
-finally:
-    shutil.rmtree(ipd)
diff --git a/xlators/features/marker/utils/syncdaemon/__init__.py b/xlators/features/marker/utils/syncdaemon/__init__.py
deleted file mode 100644
index e69de29bb..000000000
--- a/xlators/features/marker/utils/syncdaemon/__init__.py
+++ /dev/null
diff --git a/xlators/features/marker/utils/syncdaemon/configinterface.py b/xlators/features/marker/utils/syncdaemon/configinterface.py
deleted file mode 100644
index e55bec519..000000000
--- a/xlators/features/marker/utils/syncdaemon/configinterface.py
+++ /dev/null
@@ -1,224 +0,0 @@
-try:
-    import ConfigParser
-except ImportError:
-    # py 3
-    import configparser as ConfigParser
-import re
-from string import Template
-
-from syncdutils import escape, unescape, norm, update_file, GsyncdError
-
-SECT_ORD = '__section_order__'
-SECT_META = '__meta__'
-config_version = 2.0
-
-re_type = type(re.compile(''))
-
-
-class MultiDict(object):
-    """a virtual dict-like class which functions as the union of underlying dicts"""
-
-    def __init__(self, *dd):
-        self.dicts = dd
-
-    def __getitem__(self, key):
-        val = None
-        for d in self.dicts:
-            if d.get(key):
-                val = d[key]
-        if not val:
-            raise KeyError(key)
-        return val
-
-
-class GConffile(object):
-    """A high-level interface to ConfigParser which flattens the two-tiered
-       config layout by implenting automatic section dispatch based on initial
-       parameters.
-
-    Also ensure section ordering in terms of their time of addition -- a compat
-    hack for Python < 2.7.
-    """
-
-    def _normconfig(self):
-        """normalize config keys by s/-/_/g"""
-        for n, s in self.config._sections.items():
-            if n.find('__') == 0:
-                continue
-            s2 = type(s)()
-            for k, v in s.items():
-                if k.find('__') != 0:
-                    k = norm(k)
-                s2[k] = v
-            self.config._sections[n] = s2
-
-    def __init__(self, path, peers, *dd):
-        """
-        - .path: location of config file
-        - .config: underlying ConfigParser instance
-        - .peers: on behalf of whom we flatten .config
-          (master, or master-slave url pair)
-        - .auxdicts: template subtituents
-        """
-        self.peers = peers
-        self.path = path
-        self.auxdicts = dd
-        self.config = ConfigParser.RawConfigParser()
-        self.config.read(path)
-        self._normconfig()
-
-    def section(self, rx=False):
-        """get the section name of the section representing .peers in .config"""
-        peers = self.peers
-        if not peers:
-            peers = ['.', '.']
-            rx = True
-        if rx:
-            st = 'peersrx'
-        else:
-            st = 'peers'
-        return ' '.join([st] + [escape(u) for u in peers])
-
-    @staticmethod
-    def parse_section(section):
-        """retrieve peers sequence encoded by section name
-           (as urls or regexen, depending on section type)
-        """
-        sl = section.split()
-        st = sl.pop(0)
-        sl = [unescape(u) for u in sl]
-        if st == 'peersrx':
-            sl = [re.compile(u) for u in sl]
-        return sl
-
-    def ord_sections(self):
-        """Return an ordered list of sections.
-
-        Ordering happens based on the auxiliary
-        SECT_ORD section storing indices for each
-        section added through the config API.
-
-        To not to go corrupt in case of manually
-        written config files, we take care to append
-        also those sections which are not registered
-        in SECT_ORD.
-
-        Needed for python 2.{4,5,6} where ConfigParser
-        cannot yet order sections/options internally.
-        """
-        so = {}
-        if self.config.has_section(SECT_ORD):
-            so = self.config._sections[SECT_ORD]
-        so2 = {}
-        for k, v in so.items():
-            if k != '__name__':
-                so2[k] = int(v)
-        tv = 0
-        if so2:
-            tv = max(so2.values()) + 1
-        ss = [s for s in self.config.sections() if s.find('__') != 0]
-        for s in ss:
-            if s in so.keys():
-                continue
-            so2[s] = tv
-            tv += 1
-        def scmp(x, y):
-            return cmp(*(so2[s] for s in (x, y)))
-        ss.sort(scmp)
-        return ss
-
-    def update_to(self, dct, allow_unresolved=False):
-        """update @dct from key/values of ours.
-
-        key/values are collected from .config by filtering the regexp sections
-        according to match, and from .section. The values are treated as templates,
-        which are substituted from .auxdicts and (in case of regexp sections)
-        match groups.
-        """
-        if not self.peers:
-            raise GsyncdError('no peers given, cannot select matching options')
-        def update_from_sect(sect, mud):
-            for k, v in self.config._sections[sect].items():
-                if k == '__name__':
-                    continue
-                if allow_unresolved:
-                    dct[k] = Template(v).safe_substitute(mud)
-                else:
-                    dct[k] = Template(v).substitute(mud)
-        for sect in self.ord_sections():
-            sp = self.parse_section(sect)
-            if isinstance(sp[0], re_type) and len(sp) == len(self.peers):
-                match = True
-                mad = {}
-                for i in range(len(sp)):
-                    m = sp[i].search(self.peers[i])
-                    if not m:
-                        match = False
-                        break
-                    for j in range(len(m.groups())):
-                        mad['match%d_%d' % (i+1, j+1)] = m.groups()[j]
-                if match:
-                    update_from_sect(sect, MultiDict(dct, mad, *self.auxdicts))
-        if self.config.has_section(self.section()):
-            update_from_sect(self.section(), MultiDict(dct, *self.auxdicts))
-
-    def get(self, opt=None):
-        """print the matching key/value pairs from .config,
-           or if @opt given, the value for @opt (according to the
-           logic described in .update_to)
-        """
-        d = {}
-        self.update_to(d, allow_unresolved = True)
-        if opt:
-            opt = norm(opt)
-            v = d.get(opt)
-            if v:
-                print(v)
-        else:
-            for k, v in d.iteritems():
-                if k == '__name__':
-                    continue
-                print("%s: %s" % (k, v))
-
-    def write(self, trfn, opt, *a, **kw):
-        """update on-disk config transactionally
-
-        @trfn is the transaction function
-        """
-        def mergeconf(f):
-            self.config = ConfigParser.RawConfigParser()
-            self.config.readfp(f)
-            self._normconfig()
-            if not self.config.has_section(SECT_META):
-                self.config.add_section(SECT_META)
-            self.config.set(SECT_META, 'version', config_version)
-            return trfn(norm(opt), *a, **kw)
-        def updateconf(f):
-            self.config.write(f)
-        update_file(self.path, updateconf, mergeconf)
-
-    def _set(self, opt, val, rx=False):
-        """set @opt to @val in .section"""
-        sect = self.section(rx)
-        if not self.config.has_section(sect):
-            self.config.add_section(sect)
-            # regarding SECT_ORD, cf. ord_sections
-            if not self.config.has_section(SECT_ORD):
-                self.config.add_section(SECT_ORD)
-            self.config.set(SECT_ORD, sect, len(self.config._sections[SECT_ORD]))
-        self.config.set(sect, opt, val)
-        return True
-
-    def set(self, opt, *a, **kw):
-        """perform ._set transactionally"""
-        self.write(self._set, opt, *a, **kw)
-
-    def _delete(self, opt, rx=False):
-        """delete @opt from .section"""
-        sect = self.section(rx)
-        if self.config.has_section(sect):
-            return self.config.remove_option(sect, opt)
-
-    def delete(self, opt, *a, **kw):
-        """perform ._delete transactionally"""
-        self.write(self._delete, opt, *a, **kw)
diff --git a/xlators/features/marker/utils/syncdaemon/gconf.py b/xlators/features/marker/utils/syncdaemon/gconf.py
deleted file mode 100644
index 146c72a18..000000000
--- a/xlators/features/marker/utils/syncdaemon/gconf.py
+++ /dev/null
@@ -1,20 +0,0 @@
-import os
-
-class GConf(object):
-    """singleton class to store globals
-       shared between gsyncd modules"""
-
-    ssh_ctl_dir = None
-    ssh_ctl_args = None
-    cpid = None
-    pid_file_owned = False
-    log_exit = False
-    permanent_handles = []
-    log_metadata = {}
-
-    @classmethod
-    def setup_ssh_ctl(cls, ctld):
-        cls.ssh_ctl_dir = ctld
-        cls.ssh_ctl_args = ["-oControlMaster=auto", "-S", os.path.join(ctld, "gsycnd-ssh-%r@%h:%p")]
-
-gconf = GConf()
diff --git a/xlators/features/marker/utils/syncdaemon/gsyncd.py b/xlators/features/marker/utils/syncdaemon/gsyncd.py
deleted file mode 100644
index 387900e6c..000000000
--- a/xlators/features/marker/utils/syncdaemon/gsyncd.py
+++ /dev/null
@@ -1,419 +0,0 @@
-#!/usr/bin/env python
-
-import os
-import os.path
-import sys
-import time
-import logging
-import signal
-import optparse
-import fcntl
-import fnmatch
-from optparse import OptionParser, SUPPRESS_HELP
-from logging import Logger
-from errno import EEXIST, ENOENT
-
-from ipaddr import IPAddress, IPNetwork
-
-from gconf import gconf
-from syncdutils import FreeObject, norm, grabpidfile, finalize, log_raise_exception
-from syncdutils import GsyncdError, select, set_term_handler, privileged
-from configinterface import GConffile
-import resource
-from monitor import monitor
-
-class GLogger(Logger):
-    """Logger customizations for gsyncd.
-
-    It implements a log format similar to that of glusterfs.
-    """
-
-    def makeRecord(self, name, level, *a):
-        rv = Logger.makeRecord(self, name, level, *a)
-        rv.nsecs = (rv.created - int(rv.created)) * 1000000
-        fr = sys._getframe(4)
-        callee = fr.f_locals.get('self')
-        if callee:
-            ctx = str(type(callee)).split("'")[1].split('.')[-1]
-        else:
-            ctx = '<top>'
-        if not hasattr(rv, 'funcName'):
-            rv.funcName = fr.f_code.co_name
-        rv.lvlnam = logging.getLevelName(level)[0]
-        rv.ctx = ctx
-        return rv
-
-    @classmethod
-    def setup(cls, **kw):
-        lbl = kw.get('label', "")
-        if lbl:
-            lbl = '(' + lbl + ')'
-        lprm = {'datefmt': "%Y-%m-%d %H:%M:%S",
-                'format': "[%(asctime)s.%(nsecs)d] %(lvlnam)s [%(module)s" + lbl + ":%(lineno)s:%(funcName)s] %(ctx)s: %(message)s"}
-        lprm.update(kw)
-        lvl = kw.get('level', logging.INFO)
-        lprm['level'] = lvl
-        logging.root = cls("root", lvl)
-        logging.setLoggerClass(cls)
-        logging.getLogger().handlers = []
-        logging.basicConfig(**lprm)
-
-    @classmethod
-    def _gsyncd_loginit(cls, **kw):
-        lkw = {}
-        if gconf.log_level:
-            lkw['level'] = gconf.log_level
-        if kw.get('log_file'):
-            if kw['log_file'] in ('-', '/dev/stderr'):
-                lkw['stream'] = sys.stderr
-            elif kw['log_file'] == '/dev/stdout':
-                lkw['stream'] = sys.stdout
-            else:
-                lkw['filename'] = kw['log_file']
-
-        cls.setup(label=kw.get('label'), **lkw)
-
-        lkw.update({'saved_label': kw.get('label')})
-        gconf.log_metadata = lkw
-        gconf.log_exit = True
-
-def startup(**kw):
-    """set up logging, pidfile grabbing, daemonization"""
-    if getattr(gconf, 'pid_file', None) and kw.get('go_daemon') != 'postconn':
-        if not grabpidfile():
-            sys.stderr.write("pidfile is taken, exiting.\n")
-            sys.exit(2)
-        gconf.pid_file_owned = True
-
-    if kw.get('go_daemon') == 'should':
-        x, y = os.pipe()
-        gconf.cpid = os.fork()
-        if gconf.cpid:
-            os.close(x)
-            sys.exit()
-        os.close(y)
-        os.setsid()
-        dn = os.open(os.devnull, os.O_RDWR)
-        for f in (sys.stdin, sys.stdout, sys.stderr):
-            os.dup2(dn, f.fileno())
-        if getattr(gconf, 'pid_file', None):
-            if not grabpidfile(gconf.pid_file + '.tmp'):
-                raise GsyncdError("cannot grab temporary pidfile")
-            os.rename(gconf.pid_file + '.tmp', gconf.pid_file)
-        # wait for parent to terminate
-        # so we can start up with
-        # no messing from the dirty
-        # ol' bustard
-        select((x,), (), ())
-        os.close(x)
-
-    GLogger._gsyncd_loginit(**kw)
-
-def main():
-    """main routine, signal/exception handling boilerplates"""
-    gconf.starttime = time.time()
-    set_term_handler()
-    GLogger.setup()
-    excont = FreeObject(exval = 0)
-    try:
-        try:
-            main_i()
-        except:
-            log_raise_exception(excont)
-    finally:
-        finalize(exval = excont.exval)
-
-def main_i():
-    """internal main routine
-
-    parse command line, decide what action will be taken;
-    we can either:
-    - query/manipulate configuration
-    - format gsyncd urls using gsyncd's url parsing engine
-    - start service in following modes, in given stages:
-      - monitor: startup(), monitor()
-      - master: startup(), connect_remote(), connect(), service_loop()
-      - slave: startup(), connect(), service_loop()
-    """
-    rconf = {'go_daemon': 'should'}
-
-    def store_abs(opt, optstr, val, parser):
-        if val and val != '-':
-            val = os.path.abspath(val)
-        setattr(parser.values, opt.dest, val)
-    def store_local(opt, optstr, val, parser):
-        rconf[opt.dest] = val
-    def store_local_curry(val):
-        return lambda o, oo, vx, p: store_local(o, oo, val, p)
-    def store_local_obj(op, dmake):
-        return lambda o, oo, vx, p: store_local(o, oo, FreeObject(op=op, **dmake(vx)), p)
-
-    op = OptionParser(usage="%prog [options...] <master> <slave>", version="%prog 0.0.1")
-    op.add_option('--gluster-command-dir', metavar='DIR',   default='')
-    op.add_option('--gluster-log-file',    metavar='LOGF',  default=os.devnull, type=str, action='callback', callback=store_abs)
-    op.add_option('--gluster-log-level',   metavar='LVL')
-    op.add_option('--gluster-params',      metavar='PRMS',  default='')
-    op.add_option('--gluster-cli-options', metavar='OPTS',  default='--log-file=-')
-    op.add_option('--mountbroker',         metavar='LABEL')
-    op.add_option('-p', '--pid-file',      metavar='PIDF',  type=str, action='callback', callback=store_abs)
-    op.add_option('-l', '--log-file',      metavar='LOGF',  type=str, action='callback', callback=store_abs)
-    op.add_option('--log-file-mbr',        metavar='LOGF',  type=str, action='callback', callback=store_abs)
-    op.add_option('--state-file',          metavar='STATF', type=str, action='callback', callback=store_abs)
-    op.add_option('--ignore-deletes',      default=False, action='store_true')
-    op.add_option('--use-rsync-xattrs',    default=False, action='store_true')
-    op.add_option('-L', '--log-level',     metavar='LVL')
-    op.add_option('-r', '--remote-gsyncd', metavar='CMD',   default=os.path.abspath(sys.argv[0]))
-    op.add_option('--volume-id',           metavar='UUID')
-    op.add_option('--session-owner',       metavar='ID')
-    op.add_option('-s', '--ssh-command',   metavar='CMD',   default='ssh')
-    op.add_option('--rsync-command',       metavar='CMD',   default='rsync')
-    op.add_option('--rsync-options',       metavar='OPTS',  default='--sparse')
-    op.add_option('--rsync-ssh-options',   metavar='OPTS',  default='--compress')
-    op.add_option('--timeout',             metavar='SEC',   type=int, default=120)
-    op.add_option('--connection-timeout',  metavar='SEC',   type=int, default=60, help=SUPPRESS_HELP)
-    op.add_option('--sync-jobs',           metavar='N',     type=int, default=3)
-    op.add_option('--turns',               metavar='N',     type=int, default=0, help=SUPPRESS_HELP)
-    op.add_option('--allow-network',       metavar='IPS',   default='')
-    op.add_option('--socketdir',           metavar='DIR')
-    op.add_option('--state-socket-unencoded', metavar='SOCKF', type=str, action='callback', callback=store_abs)
-    op.add_option('--checkpoint',          metavar='LABEL', default='')
-    # tunables for failover/failback mechanism:
-    # None   - gsyncd behaves as normal
-    # blind  - gsyncd works with xtime pairs to identify
-    #          candidates for synchronization
-    # wrapup - same as normal mode but does not assign
-    #          xtimes to orphaned files
-    # see crawl() for usage of the above tunables
-    op.add_option('--special-sync-mode', type=str, help=SUPPRESS_HELP)
-
-    op.add_option('-c', '--config-file',   metavar='CONF',  type=str, action='callback', callback=store_local)
-    # duh. need to specify dest or value will be mapped to None :S
-    op.add_option('--monitor', dest='monitor', action='callback', callback=store_local_curry(True))
-    op.add_option('--feedback-fd', dest='feedback_fd', type=int, help=SUPPRESS_HELP, action='callback', callback=store_local)
-    op.add_option('--listen', dest='listen', help=SUPPRESS_HELP,      action='callback', callback=store_local_curry(True))
-    op.add_option('-N', '--no-daemon', dest="go_daemon",    action='callback', callback=store_local_curry('dont'))
-    op.add_option('--debug', dest="go_daemon",              action='callback', callback=lambda *a: (store_local_curry('dont')(*a),
-                                                                                                    setattr(a[-1].values, 'log_file', '-'),
-                                                                                                    setattr(a[-1].values, 'log_level', 'DEBUG'))),
-
-    for a in ('check', 'get'):
-        op.add_option('--config-' + a,      metavar='OPT',  type=str, dest='config', action='callback',
-                      callback=store_local_obj(a, lambda vx: {'opt': vx}))
-    op.add_option('--config-get-all', dest='config', action='callback', callback=store_local_obj('get', lambda vx: {'opt': None}))
-    for m in ('', '-rx', '-glob'):
-        # call this code 'Pythonic' eh?
-        # have to define a one-shot local function to be able to inject (a value depending on the)
-        # iteration variable into the inner lambda
-        def conf_mod_opt_regex_variant(rx):
-            op.add_option('--config-set' + m,   metavar='OPT VAL', type=str, nargs=2, dest='config', action='callback',
-                          callback=store_local_obj('set', lambda vx: {'opt': vx[0], 'val': vx[1], 'rx': rx}))
-            op.add_option('--config-del' + m,   metavar='OPT',  type=str, dest='config', action='callback',
-                          callback=store_local_obj('del', lambda vx: {'opt': vx, 'rx': rx}))
-        conf_mod_opt_regex_variant(m and m[1:] or False)
-
-    op.add_option('--normalize-url',           dest='url_print', action='callback', callback=store_local_curry('normal'))
-    op.add_option('--canonicalize-url',        dest='url_print', action='callback', callback=store_local_curry('canon'))
-    op.add_option('--canonicalize-escape-url', dest='url_print', action='callback', callback=store_local_curry('canon_esc'))
-
-    tunables = [ norm(o.get_opt_string()[2:]) for o in op.option_list if o.callback in (store_abs, 'store_true', None) and o.get_opt_string() not in ('--version', '--help') ]
-    remote_tunables = [ 'listen', 'go_daemon', 'timeout', 'session_owner', 'config_file', 'use_rsync_xattrs' ]
-    rq_remote_tunables = { 'listen': True }
-
-    # precedence for sources of values: 1) commandline, 2) cfg file, 3) defaults
-    # -- for this to work out we need to tell apart defaults from explicitly set
-    # options... so churn out the defaults here and call the parser with virgin
-    # values container.
-    defaults = op.get_default_values()
-    opts, args = op.parse_args(values=optparse.Values())
-    confdata = rconf.get('config')
-    if not (len(args) == 2 or \
-            (len(args) == 1 and rconf.get('listen')) or \
-            (len(args) <= 2 and confdata) or \
-            rconf.get('url_print')):
-        sys.stderr.write("error: incorrect number of arguments\n\n")
-        sys.stderr.write(op.get_usage() + "\n")
-        sys.exit(1)
-
-    restricted = os.getenv('_GSYNCD_RESTRICTED_')
-
-    if restricted:
-        allopts = {}
-        allopts.update(opts.__dict__)
-        allopts.update(rconf)
-        bannedtuns = set(allopts.keys()) - set(remote_tunables)
-        if bannedtuns:
-            raise GsyncdError('following tunables cannot be set with restricted SSH invocaton: ' + \
-                              ', '.join(bannedtuns))
-        for k, v in rq_remote_tunables.items():
-            if not k in allopts or allopts[k] != v:
-                raise GsyncdError('tunable %s is not set to value %s required for restricted SSH invocaton' % \
-                                  (k, v))
-
-    confrx = getattr(confdata, 'rx', None)
-    if confrx:
-        # peers are regexen, don't try to parse them
-        if confrx == 'glob':
-            args = [ '\A' + fnmatch.translate(a) for a in args ]
-        canon_peers = args
-        namedict = {}
-    else:
-        rscs = [resource.parse_url(u) for u in args]
-        dc = rconf.get('url_print')
-        if dc:
-            for r in rscs:
-                print(r.get_url(**{'normal': {},
-                                   'canon': {'canonical': True},
-                                   'canon_esc': {'canonical': True, 'escaped': True}}[dc]))
-            return
-        local = remote = None
-        if rscs:
-            local = rscs[0]
-            if len(rscs) > 1:
-                remote = rscs[1]
-            if not local.can_connect_to(remote):
-                raise GsyncdError("%s cannot work with %s" % (local.path, remote and remote.path))
-        pa = ([], [], [])
-        urlprms = ({}, {'canonical': True}, {'canonical': True, 'escaped': True})
-        for x in rscs:
-            for i in range(len(pa)):
-                pa[i].append(x.get_url(**urlprms[i]))
-        peers, canon_peers, canon_esc_peers = pa
-        # creating the namedict, a dict representing various ways of referring to / repreenting
-        # peers to be fillable in config templates
-        mods = (lambda x: x, lambda x: x[0].upper() + x[1:], lambda x: 'e' + x[0].upper() + x[1:])
-        if remote:
-            rmap = { local: ('local', 'master'), remote: ('remote', 'slave') }
-        else:
-            rmap = { local: ('local', 'slave') }
-        namedict = {}
-        for i in range(len(rscs)):
-            x = rscs[i]
-            for name in rmap[x]:
-                for j in range(3):
-                    namedict[mods[j](name)] = pa[j][i]
-                if x.scheme == 'gluster':
-                    namedict[name + 'vol'] = x.volume
-    if not 'config_file' in rconf:
-        rconf['config_file'] = os.path.join(os.path.dirname(sys.argv[0]), "conf/gsyncd.conf")
-    gcnf = GConffile(rconf['config_file'], canon_peers, defaults.__dict__, opts.__dict__, namedict)
-
-    checkpoint_change = False
-    if confdata:
-        opt_ok = norm(confdata.opt) in tunables + [None]
-        if confdata.op == 'check':
-            if opt_ok:
-                sys.exit(0)
-            else:
-                sys.exit(1)
-        elif not opt_ok:
-            raise GsyncdError("not a valid option: " + confdata.opt)
-        if confdata.op == 'get':
-            gcnf.get(confdata.opt)
-        elif confdata.op == 'set':
-            gcnf.set(confdata.opt, confdata.val, confdata.rx)
-        elif confdata.op == 'del':
-            gcnf.delete(confdata.opt, confdata.rx)
-        # when modifying checkpoint, it's important to make a log
-        # of that, so in that case we go on to set up logging even
-        # if its just config invocation
-        if confdata.opt == 'checkpoint' and confdata.op in ('set', 'del') and \
-           not confdata.rx:
-            checkpoint_change = True
-        if not checkpoint_change:
-            return
-
-    gconf.__dict__.update(defaults.__dict__)
-    gcnf.update_to(gconf.__dict__)
-    gconf.__dict__.update(opts.__dict__)
-    gconf.configinterface = gcnf
-
-    if restricted and gconf.allow_network:
-        ssh_conn = os.getenv('SSH_CONNECTION')
-        if not ssh_conn:
-            #legacy env var
-            ssh_conn = os.getenv('SSH_CLIENT')
-        if ssh_conn:
-            allowed_networks = [ IPNetwork(a) for a in gconf.allow_network.split(',') ]
-            client_ip = IPAddress(ssh_conn.split()[0])
-            allowed = False
-            for nw in allowed_networks:
-                if client_ip in nw:
-                    allowed = True
-                    break
-            if not allowed:
-                raise GsyncdError("client IP address is not allowed")
-
-    ffd = rconf.get('feedback_fd')
-    if ffd:
-        fcntl.fcntl(ffd, fcntl.F_SETFD, fcntl.FD_CLOEXEC)
-
-    #normalize loglevel
-    lvl0 = gconf.log_level
-    if isinstance(lvl0, str):
-        lvl1 = lvl0.upper()
-        lvl2 = logging.getLevelName(lvl1)
-        # I have _never_ _ever_ seen such an utterly braindead
-        # error condition
-        if lvl2 == "Level " + lvl1:
-            raise GsyncdError('cannot recognize log level "%s"' % lvl0)
-        gconf.log_level = lvl2
-
-    if not privileged() and gconf.log_file_mbr:
-        gconf.log_file = gconf.log_file_mbr
-
-    if checkpoint_change:
-        try:
-            GLogger._gsyncd_loginit(log_file=gconf.log_file, label='conf')
-            if confdata.op == 'set':
-                logging.info('checkpoint %s set' % confdata.val)
-            elif confdata.op == 'del':
-                logging.info('checkpoint info was reset')
-        except IOError:
-            if sys.exc_info()[1].errno == ENOENT:
-                # directory of log path is not present,
-                # which happens if we get here from
-                # a peer-multiplexed "config-set checkpoint"
-                # (as that directory is created only on the
-                # original node)
-                pass
-            else:
-                raise
-        return
-
-    go_daemon = rconf['go_daemon']
-    be_monitor = rconf.get('monitor')
-
-    if not be_monitor and isinstance(remote, resource.SSH) and \
-       go_daemon == 'should':
-        go_daemon = 'postconn'
-        log_file = None
-    else:
-        log_file = gconf.log_file
-    if be_monitor:
-        label = 'monitor'
-    elif remote:
-        #master
-        label = ''
-    else:
-        label = 'slave'
-    startup(go_daemon=go_daemon, log_file=log_file, label=label)
-
-    if be_monitor:
-        return monitor()
-
-    logging.info("syncing: %s" % " -> ".join(peers))
-    resource.Popen.init_errhandler()
-    if remote:
-        go_daemon = remote.connect_remote(go_daemon=go_daemon)
-        if go_daemon:
-            startup(go_daemon=go_daemon, log_file=gconf.log_file)
-            # complete remote connection in child
-            remote.connect_remote(go_daemon='done')
-    local.connect()
-    if ffd:
-        os.close(ffd)
-    local.service_loop(*[r for r in [remote] if r])
-
-
-if __name__ == "__main__":
-    main()
diff --git a/xlators/features/marker/utils/syncdaemon/libcxattr.py b/xlators/features/marker/utils/syncdaemon/libcxattr.py
deleted file mode 100644
index f0a9d2292..000000000
--- a/xlators/features/marker/utils/syncdaemon/libcxattr.py
+++ /dev/null
@@ -1,72 +0,0 @@
-import os
-from ctypes import *
-from ctypes.util import find_library
-
-class Xattr(object):
-    """singleton that wraps the extended attribues system
-       interface for python using ctypes
-
-       Just implement it to the degree we need it, in particular
-       - we need just the l*xattr variants, ie. we never want symlinks to be
-         followed
-       - don't need size discovery for getxattr, as we always know the exact
-         sizes we expect
-    """
-
-    libc = CDLL(find_library("libc"))
-
-    @classmethod
-    def geterrno(cls):
-        return c_int.in_dll(cls.libc, 'errno').value
-
-    @classmethod
-    def raise_oserr(cls):
-        errn = cls.geterrno()
-        raise OSError(errn, os.strerror(errn))
-
-    @classmethod
-    def _query_xattr(cls, path, siz, syscall, *a):
-        if siz:
-            buf = create_string_buffer('\0' * siz)
-        else:
-            buf = None
-        ret = getattr(cls.libc, syscall)(*((path,) + a + (buf, siz)))
-        if ret == -1:
-            cls.raise_oserr()
-        if siz:
-            return buf.raw[:ret]
-        else:
-            return ret
-
-    @classmethod
-    def lgetxattr(cls, path, attr, siz=0):
-        return cls._query_xattr( path, siz, 'lgetxattr', attr)
-
-    @classmethod
-    def llistxattr(cls, path, siz=0):
-        ret = cls._query_xattr(path, siz, 'llistxattr')
-        if isinstance(ret, str):
-            ret = ret.split('\0')
-        return ret
-
-    @classmethod
-    def lsetxattr(cls, path, attr, val):
-        ret = cls.libc.lsetxattr(path, attr, val, len(val), 0)
-        if ret == -1:
-            cls.raise_oserr()
-
-    @classmethod
-    def lremovexattr(cls, path, attr):
-        ret = cls.libc.lremovexattr(path, attr)
-        if ret == -1:
-            cls.raise_oserr()
-
-    @classmethod
-    def llistxattr_buf(cls, path):
-        """listxattr variant with size discovery"""
-        size = cls.llistxattr(path)
-        if size == -1:
-            cls.raise_oserr()
-        if size == 0:
-            return []
-        return cls.llistxattr(path, size)
diff --git a/xlators/features/marker/utils/syncdaemon/master.py b/xlators/features/marker/utils/syncdaemon/master.py
deleted file mode 100644
index 19cb09e7b..000000000
--- a/xlators/features/marker/utils/syncdaemon/master.py
+++ /dev/null
@@ -1,915 +0,0 @@
-import os
-import sys
-import time
-import stat
-import random
-import signal
-import logging
-import socket
-import errno
-from errno import ENOENT, ENODATA, EPIPE
-from threading import currentThread, Condition, Lock
-from datetime import datetime
-try:
-    from hashlib import md5 as md5
-except ImportError:
-    # py 2.4
-    from md5 import new as md5
-
-from gconf import gconf
-from syncdutils import FreeObject, Thread, GsyncdError, boolify, \
-                       escape, unescape, select
-
-URXTIME = (-1, 0)
-
-# Utility functions to help us to get to closer proximity
-# of the DRY principle (no, don't look for elevated or
-# perspectivistic things here)
-
-def _xtime_now():
-    t = time.time()
-    sec = int(t)
-    nsec = int((t - sec) * 1000000)
-    return (sec, nsec)
-
-def _volinfo_hook_relax_foreign(self):
-    volinfo_sys = self.get_sys_volinfo()
-    fgn_vi = volinfo_sys[self.KFGN]
-    if fgn_vi:
-        expiry = fgn_vi['timeout'] - int(time.time()) + 1
-        logging.info('foreign volume info found, waiting %d sec for expiry' % \
-                     expiry)
-        time.sleep(expiry)
-        volinfo_sys = self.get_sys_volinfo()
-    self.volinfo_state, state_change = self.volinfo_state_machine(self.volinfo_state,
-                                                                  volinfo_sys)
-    if self.inter_master:
-        raise GsyncdError("cannot be intermediate master in special mode")
-    return (volinfo_sys, state_change)
-
-
-# The API!
-
-def gmaster_builder():
-    """produce the GMaster class variant corresponding
-       to sync mode"""
-    this = sys.modules[__name__]
-    modemixin = gconf.special_sync_mode
-    if not modemixin:
-        modemixin = 'normal'
-    logging.info('setting up master for %s sync mode' % modemixin)
-    modemixin = getattr(this, modemixin.capitalize() + 'Mixin')
-    sendmarkmixin = boolify(gconf.use_rsync_xattrs) and SendmarkRsyncMixin or SendmarkNormalMixin
-    purgemixin = boolify(gconf.ignore_deletes) and PurgeNoopMixin or PurgeNormalMixin
-    class _GMaster(GMasterBase, modemixin, sendmarkmixin, purgemixin):
-        pass
-    return _GMaster
-
-
-# Mixin classes that implement the data format
-# and logic particularities of the certain
-# sync modes
-
-class NormalMixin(object):
-    """normal geo-rep behavior"""
-
-    minus_infinity = URXTIME
-
-    # following staticmethods ideally would be
-    # methods of an xtime object (in particular,
-    # implementing the hooks needed for comparison
-    # operators), but at this point we don't yet
-    # have a dedicated xtime class
-
-    @staticmethod
-    def serialize_xtime(xt):
-        return "%d.%d" % tuple(xt)
-
-    @staticmethod
-    def deserialize_xtime(xt):
-        return tuple(int(x) for x in xt.split("."))
-
-    @staticmethod
-    def native_xtime(xt):
-        return xt
-
-    @staticmethod
-    def xtime_geq(xt0, xt1):
-        return xt0 >= xt1
-
-    def make_xtime_opts(self, is_master, opts):
-        if not 'create' in opts:
-            opts['create'] = is_master and not self.inter_master
-        if not 'default_xtime' in opts:
-            if is_master and self.inter_master:
-                opts['default_xtime'] = ENODATA
-            else:
-                opts['default_xtime'] = URXTIME
-
-    def xtime_low(self, server, path, **opts):
-        xt = server.xtime(path, self.uuid)
-        if isinstance(xt, int) and xt != ENODATA:
-            return xt
-        if xt == ENODATA or xt < self.volmark:
-            if opts['create']:
-                xt = _xtime_now()
-                server.set_xtime(path, self.uuid, xt)
-            else:
-                xt = opts['default_xtime']
-        return xt
-
-    def keepalive_payload_hook(self, timo, gap):
-        # first grab a reference as self.volinfo
-        # can be changed in main thread
-        vi = self.volinfo
-        if vi:
-            # then have a private copy which we can mod
-            vi = vi.copy()
-            vi['timeout'] = int(time.time()) + timo
-        else:
-            # send keep-alives more frequently to
-            # avoid a delay in announcing our volume info
-            # to slave if it becomes established in the
-            # meantime
-            gap = min(10, gap)
-        return (vi, gap)
-
-    def volinfo_hook(self):
-        volinfo_sys = self.get_sys_volinfo()
-        self.volinfo_state, state_change = self.volinfo_state_machine(self.volinfo_state,
-                                                                      volinfo_sys)
-        return (volinfo_sys, state_change)
-
-    def xtime_reversion_hook(self, path, xtl, xtr):
-        if xtr > xtl:
-            raise GsyncdError("timestamp corruption for " + path)
-
-    def need_sync(self, e, xte, xtrd):
-        return xte > xtrd
-
-    def set_slave_xtime(self, path, mark):
-        self.slave.server.set_xtime(path, self.uuid, mark)
-
-class WrapupMixin(NormalMixin):
-    """a variant that differs from normal in terms
-       of ignoring non-indexed files"""
-
-    @staticmethod
-    def make_xtime_opts(is_master, opts):
-        if not 'create' in opts:
-            opts['create'] = False
-        if not 'default_xtime' in opts:
-            opts['default_xtime'] = URXTIME
-
-    @staticmethod
-    def keepalive_payload_hook(timo, gap):
-        return (None, gap)
-
-    def volinfo_hook(self):
-        return _volinfo_hook_relax_foreign(self)
-
-class BlindMixin(object):
-    """Geo-rep flavor using vectored xtime.
-
-    Coordinates are the master, slave uuid pair;
-    in master coordinate behavior is normal,
-    in slave coordinate we force synchronization
-    on any value difference (these are in disjunctive
-    relation, ie. if either orders the entry to be
-    synced, it shall be synced.
-    """
-
-    minus_infinity = (URXTIME, None)
-
-    @staticmethod
-    def serialize_xtime(xt):
-        a = []
-        for x in xt:
-            if not x:
-                x = ('None', '')
-            a.extend(x)
-        return '.'.join(str(n) for n in a)
-
-    @staticmethod
-    def deserialize_xtime(xt):
-        a = xt.split(".")
-        a = (tuple(a[0:2]), tuple(a[3:4]))
-        b = []
-        for p in a:
-            if p[0] == 'None':
-                p = None
-            else:
-                p = tuple(int(x) for x in p)
-            b.append(p)
-        return tuple(b)
-
-    @staticmethod
-    def native_xtime(xt):
-        return xt[0]
-
-    @staticmethod
-    def xtime_geq(xt0, xt1):
-        return (not xt1[0] or xt0[0] >= xt1[0]) and \
-               (not xt1[1] or xt0[1] >= xt1[1])
-
-    @property
-    def ruuid(self):
-        if self.volinfo_r:
-            return self.volinfo_r['uuid']
-
-    @staticmethod
-    def make_xtime_opts(is_master, opts):
-        if not 'create' in opts:
-            opts['create'] = is_master
-        if not 'default_xtime' in opts:
-            opts['default_xtime'] = URXTIME
-
-    def xtime_low(self, server, path, **opts):
-        xtd = server.xtime_vec(path, self.uuid, self.ruuid)
-        if isinstance(xtd, int):
-            return xtd
-        xt = (xtd[self.uuid], xtd[self.ruuid])
-        if not xt[1] and (not xt[0] or xt[0] < self.volmark):
-            if opts['create']:
-                # not expected, but can happen if file originates
-                # from interrupted gsyncd transfer
-                logging.warn('have to fix up missing xtime on ' + path)
-                xt0 = _xtime_now()
-                server.set_xtime(path, self.uuid, xt0)
-            else:
-                xt0 = opts['default_xtime']
-            xt = (xt0, xt[1])
-        return xt
-
-    @staticmethod
-    def keepalive_payload_hook(timo, gap):
-        return (None, gap)
-
-    def volinfo_hook(self):
-        res = _volinfo_hook_relax_foreign(self)
-        volinfo_r_new = self.slave.server.native_volume_info()
-        if volinfo_r_new['retval']:
-            raise GsyncdError("slave is corrupt")
-        if getattr(self, 'volinfo_r', None):
-            if self.volinfo_r['uuid'] != volinfo_r_new['uuid']:
-                raise GsyncdError("uuid mismatch on slave")
-        self.volinfo_r = volinfo_r_new
-        return res
-
-    def xtime_reversion_hook(self, path, xtl, xtr):
-        if not isinstance(xtr[0], int) and \
-          (isinstance(xtl[0], int) or xtr[0] > xtl[0]):
-            raise GsyncdError("timestamp corruption for " + path)
-
-    def need_sync(self, e, xte, xtrd):
-        if xte[0]:
-            if not xtrd[0] or xte[0] > xtrd[0]:
-                # there is outstanding diff at 0th pos,
-                # we can short-cut to true
-                return True
-        # we arrived to this point by either of these
-        # two possiblilites:
-        # - no outstanding difference at 0th pos,
-        #   wanna see 1st pos if he raises veto
-        #   against "no need to sync" proposal
-        # - no data at 0th pos, 1st pos will have
-        #   to decide (due to xtime assignment,
-        #   in this case 1st pos does carry data
-        #   -- iow, if 1st pos did not have data,
-        #   and 0th neither, 0th would have been
-        #   force-feeded)
-        if not xte[1]:
-            # no data, no veto
-            return False
-        # the hard work: for 1st pos,
-        # the conduct is fetch corresponding
-        # slave data and do a "blind" comparison
-        # (ie. do not care who is newer, we trigger
-        # sync on non-identical xitmes)
-        xtr = self.xtime(e, self.slave)
-        return isinstance(xtr, int) or xte[1] != xtr[1]
-
-    def set_slave_xtime(self, path, mark):
-        xtd = {}
-        for (u, t) in zip((self.uuid, self.ruuid), mark):
-            if t:
-                xtd[u] = t
-        self.slave.server.set_xtime_vec(path, xtd)
-
-
-# Further mixins for certain tunable behaviors
-
-class SendmarkNormalMixin(object):
-
-    def sendmark_regular(self, *a, **kw):
-        return self.sendmark(*a, **kw)
-
-class SendmarkRsyncMixin(object):
-
-    def sendmark_regular(self, *a, **kw):
-        pass
-
-
-class PurgeNormalMixin(object):
-
-    def purge_missing(self, path, names):
-        self.slave.server.purge(path, names)
-
-class PurgeNoopMixin(object):
-
-    def purge_missing(self, path, names):
-        pass
-
-
-
-class GMasterBase(object):
-    """abstract class impementling master role"""
-
-    KFGN = 0
-    KNAT = 1
-
-    def get_sys_volinfo(self):
-        """query volume marks on fs root
-
-        err out on multiple foreign masters
-        """
-        fgn_vis, nat_vi = self.master.server.foreign_volume_infos(), \
-                          self.master.server.native_volume_info()
-        fgn_vi = None
-        if fgn_vis:
-            if len(fgn_vis) > 1:
-                raise GsyncdError("cannot work with multiple foreign masters")
-            fgn_vi = fgn_vis[0]
-        return fgn_vi, nat_vi
-
-    @property
-    def uuid(self):
-        if self.volinfo:
-            return self.volinfo['uuid']
-
-    @property
-    def volmark(self):
-        if self.volinfo:
-            return self.volinfo['volume_mark']
-
-    @property
-    def inter_master(self):
-        """decide if we are an intermediate master
-        in a cascading setup
-        """
-        return self.volinfo_state[self.KFGN] and True or False
-
-    def xtime(self, path, *a, **opts):
-        """get amended xtime
-
-        as of amending, we can create missing xtime, or
-        determine a valid value if what we get is expired
-        (as of the volume mark expiry); way of amendig
-        depends on @opts and on subject of query (master
-        or slave).
-        """
-        if a:
-            rsc = a[0]
-        else:
-            rsc = self.master
-        self.make_xtime_opts(rsc == self.master, opts)
-        return self.xtime_low(rsc.server, path, **opts)
-
-    def __init__(self, master, slave):
-        self.master = master
-        self.slave = slave
-        self.jobtab = {}
-        self.syncer = Syncer(slave)
-        # crawls vs. turns:
-        # - self.crawls is simply the number of crawl() invocations on root
-        # - one turn is a maximal consecutive sequence of crawls so that each
-        #   crawl in it detects a change to be synced
-        # - self.turns is the number of turns since start
-        # - self.total_turns is a limit so that if self.turns reaches it, then
-        #   we exit (for diagnostic purposes)
-        # so, eg., if the master fs changes unceasingly, self.turns will remain 0.
-        self.crawls = 0
-        self.turns = 0
-        self.total_turns = int(gconf.turns)
-        self.lastreport = {'crawls': 0, 'turns': 0}
-        self.start = None
-        self.change_seen = None
-        # the authoritative (foreign, native) volinfo pair
-        # which lets us deduce what to do when we refetch
-        # the volinfos from system
-        uuid_preset = getattr(gconf, 'volume_id', None)
-        self.volinfo_state = (uuid_preset and {'uuid': uuid_preset}, None)
-        # the actual volinfo we make use of
-        self.volinfo = None
-        self.terminate = False
-        self.checkpoint_thread = None
-
-    @classmethod
-    def _checkpt_param(cls, chkpt, prm, xtimish=True):
-        """use config backend to lookup a parameter belonging to
-           checkpoint @chkpt"""
-        cprm = getattr(gconf, 'checkpoint_' + prm, None)
-        if not cprm:
-            return
-        chkpt_mapped, val = cprm.split(':', 1)
-        if unescape(chkpt_mapped) != chkpt:
-            return
-        if xtimish:
-            val = cls.deserialize_xtime(val)
-        return val
-
-    @classmethod
-    def _set_checkpt_param(cls, chkpt, prm, val, xtimish=True):
-        """use config backend to store a parameter associated
-           with checkpoint @chkpt"""
-        if xtimish:
-            val = cls.serialize_xtime(val)
-        gconf.configinterface.set('checkpoint_' + prm, "%s:%s" % (escape(chkpt), val))
-
-    @staticmethod
-    def humantime(*tpair):
-        """format xtime-like (sec, nsec) pair to human readable format"""
-        ts = datetime.fromtimestamp(float('.'.join(str(n) for n in tpair))).\
-               strftime("%Y-%m-%d %H:%M:%S")
-        if len(tpair) > 1:
-            ts += '.' + str(tpair[1])
-        return ts
-
-    def checkpt_service(self, chan, chkpt, tgt):
-        """checkpoint service loop
-
-        monitor and verify checkpoint status for @chkpt, and listen
-        for incoming requests for whom we serve a pretty-formatted
-        status report"""
-        if not chkpt:
-            # dummy loop for the case when there is no checkpt set
-            while True:
-                select([chan], [], [])
-                conn, _ = chan.accept()
-                conn.send('\0')
-                conn.close()
-        completed = self._checkpt_param(chkpt, 'completed', xtimish=False)
-        if completed:
-            completed = tuple(int(x) for x in completed.split('.'))
-        while True:
-            s,_,_ = select([chan], [], [], (not completed) and 5 or None)
-            # either request made and we re-check to not
-            # give back stale data, or we still hunting for completion
-            if self.native_xtime(tgt) and self.native_xtime(tgt) < self.volmark:
-                # indexing has been reset since setting the checkpoint
-                status = "is invalid"
-            else:
-                xtr = self.xtime('.', self.slave)
-                if isinstance(xtr, int):
-                    raise GsyncdError("slave root directory is unaccessible (%s)",
-                                      os.strerror(xtr))
-                ncompleted = self.xtime_geq(xtr, tgt)
-                if completed and not ncompleted: # stale data
-                    logging.warn("completion time %s for checkpoint %s became stale" % \
-                                 (self.humantime(*completed), chkpt))
-                    completed = None
-                    gconf.confdata.delete('checkpoint-completed')
-                if ncompleted and not completed: # just reaching completion
-                    completed = "%.6f" % time.time()
-                    self._set_checkpt_param(chkpt, 'completed', completed, xtimish=False)
-                    completed = tuple(int(x) for x in completed.split('.'))
-                    logging.info("checkpoint %s completed" % chkpt)
-                status = completed and \
-                  "completed at " + self.humantime(completed[0]) or \
-                  "not reached yet"
-            if s:
-                conn = None
-                try:
-                    conn, _ = chan.accept()
-                    try:
-                        conn.send("  | checkpoint %s %s\0" % (chkpt, status))
-                    except:
-                        exc = sys.exc_info()[1]
-                        if (isinstance(exc, OSError) or isinstance(exc, IOError)) and \
-                           exc.errno == EPIPE:
-                            logging.debug('checkpoint client disconnected')
-                        else:
-                            raise
-                finally:
-                    if conn:
-                        conn.close()
-
-    def start_checkpoint_thread(self):
-        """prepare and start checkpoint service"""
-        if self.checkpoint_thread or not (
-          getattr(gconf, 'state_socket_unencoded', None) and getattr(gconf, 'socketdir', None)
-        ):
-            return
-        chan = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
-        state_socket = os.path.join(gconf.socketdir, md5(gconf.state_socket_unencoded).hexdigest() + ".socket")
-        try:
-            os.unlink(state_socket)
-        except:
-            if sys.exc_info()[0] == OSError:
-                pass
-        chan.bind(state_socket)
-        chan.listen(1)
-        checkpt_tgt = None
-        if gconf.checkpoint:
-            checkpt_tgt = self._checkpt_param(gconf.checkpoint, 'target')
-            if not checkpt_tgt:
-                checkpt_tgt = self.xtime('.')
-                if isinstance(checkpt_tgt, int):
-                    raise GsyncdError("master root directory is unaccessible (%s)",
-                                      os.strerror(checkpt_tgt))
-                self._set_checkpt_param(gconf.checkpoint, 'target', checkpt_tgt)
-            logging.debug("checkpoint target %s has been determined for checkpoint %s" % \
-                          (repr(checkpt_tgt), gconf.checkpoint))
-        t = Thread(target=self.checkpt_service, args=(chan, gconf.checkpoint, checkpt_tgt))
-        t.start()
-        self.checkpoint_thread = t
-
-    def crawl_loop(self):
-        """start the keep-alive thread and iterate .crawl"""
-        timo = int(gconf.timeout or 0)
-        if timo > 0:
-            def keep_alive():
-                while True:
-                    vi, gap = self.keepalive_payload_hook(timo, timo * 0.5)
-                    self.slave.server.keep_alive(vi)
-                    time.sleep(gap)
-            t = Thread(target=keep_alive)
-            t.start()
-        self.lastreport['time'] = time.time()
-        while not self.terminate:
-            self.crawl()
-
-    def add_job(self, path, label, job, *a, **kw):
-        """insert @job function to job table at @path with @label"""
-        if self.jobtab.get(path) == None:
-            self.jobtab[path] = []
-        self.jobtab[path].append((label, a, lambda : job(*a, **kw)))
-
-    def add_failjob(self, path, label):
-        """invoke .add_job with a job that does nothing just fails"""
-        logging.debug('salvaged: ' + label)
-        self.add_job(path, label, lambda: False)
-
-    def wait(self, path, *args):
-        """perform jobs registered for @path
-
-        Reset jobtab entry for @path,
-        determine success as the conjuction of
-        success of all the jobs. In case of
-        success, call .sendmark on @path
-        """
-        jobs = self.jobtab.pop(path, [])
-        succeed = True
-        for j in jobs:
-            ret = j[-1]()
-            if not ret:
-                succeed = False
-        if succeed:
-            self.sendmark(path, *args)
-        return succeed
-
-    def sendmark(self, path, mark, adct=None):
-        """update slave side xtime for @path to master side xtime
-
-        also can send a setattr payload (see Server.setattr).
-        """
-        if adct:
-            self.slave.server.setattr(path, adct)
-        self.set_slave_xtime(path, mark)
-
-    @staticmethod
-    def volinfo_state_machine(volinfo_state, volinfo_sys):
-        """compute new volinfo_state from old one and incoming
-           as of current system state, also indicating if there was a
-           change regarding which volume mark is the authoritative one
-
-        @volinfo_state, @volinfo_sys are pairs of volume mark dicts
-        (foreign, native).
-
-        Note this method is marked as static, ie. the computation is
-        pure, without reliance on any excess implicit state. State
-        transitions which are deemed as ambiguous or banned will raise
-        an exception.
-
-        """
-        # store the value below "boxed" to emulate proper closures
-        # (variables of the enclosing scope are available inner functions
-        # provided they are no reassigned; mutation is OK).
-        param = FreeObject(relax_mismatch = False, state_change = None, index=-1)
-        def select_vi(vi0, vi):
-            param.index += 1
-            if vi and (not vi0 or vi0['uuid'] == vi['uuid']):
-                if not vi0 and not param.relax_mismatch:
-                    param.state_change = param.index
-                # valid new value found; for the rest, we are graceful about
-                # uuid mismatch
-                param.relax_mismatch = True
-                return vi
-            if vi0 and vi and vi0['uuid'] != vi['uuid'] and not param.relax_mismatch:
-                # uuid mismatch for master candidate, bail out
-                raise GsyncdError("aborting on uuid change from %s to %s" % \
-                                   (vi0['uuid'], vi['uuid']))
-            # fall back to old
-            return vi0
-        newstate = tuple(select_vi(*vip) for vip in zip(volinfo_state, volinfo_sys))
-        srep = lambda vi: vi and vi['uuid'][0:8]
-        logging.debug('(%s, %s) << (%s, %s) -> (%s, %s)' % \
-                      tuple(srep(vi) for vi in volinfo_state + volinfo_sys + newstate))
-        return newstate, param.state_change
-
-    def crawl(self, path='.', xtl=None):
-        """crawling...
-
-          Standing around
-          All the right people
-          Crawling
-          Tennis on Tuesday
-          The ladder is long
-          It is your nature
-          You've gotta suntan
-          Football on Sunday
-          Society boy
-
-        Recursively walk the master side tree and check if updates are
-        needed due to xtime differences. One invocation of crawl checks
-        children of @path and do a recursive enter only on
-        those directory children where there is an update needed.
-
-        Way of updates depend on file type:
-        - for symlinks, sync them directy and synchronously
-        - for regular children, register jobs for @path (cf. .add_job) to start
-          and wait on their rsync
-        - for directory children, register a job for @path which waits (.wait)
-          on jobs for the given child
-        (other kind of filesystem nodes are not considered)
-
-        Those slave side children which do not exist on master are simply
-        purged (see Server.purge).
-
-        Behavior is fault tolerant, synchronization is adaptive: if some action fails,
-        just go on relentlessly, adding a fail job (see .add_failjob) which will prevent
-        the .sendmark on @path, so when the next crawl will arrive to @path it will not
-        see it as up-to-date and  will try to sync it again. While this semantics can be
-        supported by funky design principles (http://c2.com/cgi/wiki?LazinessImpatienceHubris),
-        the ultimate reason which excludes other possibilities is simply transience: we cannot
-        assert that the file systems (master / slave) underneath do not change and actions
-        taken upon some condition will not lose their context by the time they are performed.
-        """
-        if path == '.':
-            if self.start:
-                self.crawls += 1
-                logging.debug("... crawl #%d done, took %.6f seconds" % \
-                              (self.crawls, time.time() - self.start))
-            time.sleep(1)
-            self.start = time.time()
-            should_display_info = self.start - self.lastreport['time'] >= 60
-            if should_display_info:
-                logging.info("completed %d crawls, %d turns",
-                             self.crawls - self.lastreport['crawls'],
-                             self.turns - self.lastreport['turns'])
-                self.lastreport.update(crawls = self.crawls,
-                                       turns = self.turns,
-                                       time = self.start)
-            volinfo_sys, state_change = self.volinfo_hook()
-            if self.inter_master:
-                self.volinfo = volinfo_sys[self.KFGN]
-            else:
-                self.volinfo = volinfo_sys[self.KNAT]
-            if state_change == self.KFGN or (state_change == self.KNAT and not self.inter_master):
-                logging.info('new master is %s', self.uuid)
-                if self.volinfo:
-                    logging.info("%s master with volume id %s ..." % \
-                                 (self.inter_master and "intermediate" or "primary",
-                                  self.uuid))
-            if state_change == self.KFGN:
-               gconf.configinterface.set('volume_id', self.uuid)
-            if self.volinfo:
-                if self.volinfo['retval']:
-                    raise GsyncdError ("master is corrupt")
-                self.start_checkpoint_thread()
-            else:
-                if should_display_info or self.crawls == 0:
-                    if self.inter_master:
-                        logging.info("waiting for being synced from %s ..." % \
-                                     self.volinfo_state[self.KFGN]['uuid'])
-                    else:
-                        logging.info("waiting for volume info ...")
-                return
-        logging.debug("entering " + path)
-        if not xtl:
-            xtl = self.xtime(path)
-            if isinstance(xtl, int):
-                self.add_failjob(path, 'no-local-node')
-                return
-        xtr = self.xtime(path, self.slave)
-        if isinstance(xtr, int):
-            if xtr != ENOENT:
-                self.slave.server.purge(path)
-            try:
-                self.slave.server.mkdir(path)
-            except OSError:
-                self.add_failjob(path, 'no-remote-node')
-                return
-            xtr = self.minus_infinity
-        else:
-            self.xtime_reversion_hook(path, xtl, xtr)
-            if xtl == xtr:
-                if path == '.' and self.change_seen:
-                    self.turns += 1
-                    self.change_seen = False
-                    if self.total_turns:
-                        logging.info("finished turn #%s/%s" % \
-                                     (self.turns, self.total_turns))
-                        if self.turns == self.total_turns:
-                            logging.info("reached turn limit")
-                            self.terminate = True
-                return
-        if path == '.':
-            self.change_seen = True
-        try:
-            dem = self.master.server.entries(path)
-        except OSError:
-            self.add_failjob(path, 'local-entries-fail')
-            return
-        random.shuffle(dem)
-        try:
-            des = self.slave.server.entries(path)
-        except OSError:
-            self.slave.server.purge(path)
-            try:
-                self.slave.server.mkdir(path)
-                des = self.slave.server.entries(path)
-            except OSError:
-                self.add_failjob(path, 'remote-entries-fail')
-                return
-        dd = set(des) - set(dem)
-        if dd:
-            self.purge_missing(path, dd)
-        chld = []
-        for e in dem:
-            e = os.path.join(path, e)
-            xte = self.xtime(e)
-            if isinstance(xte, int):
-                logging.warn("irregular xtime for %s: %s" % (e, errno.errorcode[xte]))
-            elif self.need_sync(e, xte, xtr):
-                chld.append((e, xte))
-        def indulgently(e, fnc, blame=None):
-            if not blame:
-                blame = path
-            try:
-                return fnc(e)
-            except (IOError, OSError):
-                ex = sys.exc_info()[1]
-                if ex.errno == ENOENT:
-                    logging.warn("salvaged ENOENT for " + e)
-                    self.add_failjob(blame, 'by-indulgently')
-                    return False
-                else:
-                    raise
-        for e, xte in chld:
-            st = indulgently(e, lambda e: os.lstat(e))
-            if st == False:
-                continue
-            mo = st.st_mode
-            adct = {'own': (st.st_uid, st.st_gid)}
-            if stat.S_ISLNK(mo):
-                if indulgently(e, lambda e: self.slave.server.symlink(os.readlink(e), e)) == False:
-                    continue
-                self.sendmark(e, xte, adct)
-            elif stat.S_ISREG(mo):
-                logging.debug("syncing %s ..." % e)
-                pb = self.syncer.add(e)
-                def regjob(e, xte, pb):
-                    if pb.wait():
-                        logging.debug("synced " + e)
-                        self.sendmark_regular(e, xte)
-                        return True
-                    else:
-                        logging.warn("failed to sync " + e)
-                self.add_job(path, 'reg', regjob, e, xte, pb)
-            elif stat.S_ISDIR(mo):
-                adct['mode'] = mo
-                if indulgently(e, lambda e: (self.add_job(path, 'cwait', self.wait, e, xte, adct),
-                                             self.crawl(e, xte),
-                                             True)[-1], blame=e) == False:
-                    continue
-            else:
-                # ignore fifos, sockets and special files
-                pass
-        if path == '.':
-            self.wait(path, xtl)
-
-class BoxClosedErr(Exception):
-    pass
-
-class PostBox(list):
-    """synchronized collection for storing things thought of as "requests" """
-
-    def __init__(self, *a):
-        list.__init__(self, *a)
-        # too bad Python stdlib does not have read/write locks...
-        # it would suffivce to grab the lock in .append as reader, in .close as writer
-        self.lever = Condition()
-        self.open = True
-        self.done = False
-
-    def wait(self):
-        """wait on requests to be processed"""
-        self.lever.acquire()
-        if not self.done:
-            self.lever.wait()
-        self.lever.release()
-        return self.result
-
-    def wakeup(self, data):
-        """wake up requestors with the result"""
-        self.result = data
-        self.lever.acquire()
-        self.done = True
-        self.lever.notifyAll()
-        self.lever.release()
-
-    def append(self, e):
-        """post a request"""
-        self.lever.acquire()
-        if not self.open:
-            raise BoxClosedErr
-        list.append(self, e)
-        self.lever.release()
-
-    def close(self):
-        """prohibit the posting of further requests"""
-        self.lever.acquire()
-        self.open = False
-        self.lever.release()
-
-class Syncer(object):
-    """a staged queue to relay rsync requests to rsync workers
-
-    By "staged queue" its meant that when a consumer comes to the
-    queue, it takes _all_ entries, leaving the queue empty.
-    (I don't know if there is an official term for this pattern.)
-
-    The queue uses a PostBox to accumulate incoming items.
-    When a consumer (rsync worker) comes, a new PostBox is
-    set up and the old one is passed on to the consumer.
-
-    Instead of the simplistic scheme of having one big lock
-    which synchronizes both the addition of new items and
-    PostBox exchanges, use a separate lock to arbitrate consumers,
-    and rely on PostBox's synchronization mechanisms take
-    care about additions.
-
-    There is a corner case racy situation, producers vs. consumers,
-    which is not handled by this scheme: namely, when the PostBox
-    exchange occurs in between being passed to the producer for posting
-    and the post placement. But that's what Postbox.close is for:
-    such a posting will find the PostBox closed, in which case
-    the producer can re-try posting against the actual PostBox of
-    the queue.
-
-    To aid accumlation of items in the PostBoxen before grabbed
-    by an rsync worker, the worker goes to sleep a bit after
-    each completed syncjob.
-    """
-
-    def __init__(self, slave):
-        """spawn worker threads"""
-        self.slave = slave
-        self.lock = Lock()
-        self.pb = PostBox()
-        for i in range(int(gconf.sync_jobs)):
-            t = Thread(target=self.syncjob)
-            t.start()
-
-    def syncjob(self):
-        """the life of a worker"""
-        while True:
-            pb = None
-            while True:
-                self.lock.acquire()
-                if self.pb:
-                    pb, self.pb = self.pb, PostBox()
-                self.lock.release()
-                if pb:
-                    break
-                time.sleep(0.5)
-            pb.close()
-            po = self.slave.rsync(pb)
-            if po.returncode == 0:
-                ret = True
-            elif po.returncode in (23, 24):
-                # partial transfer (cf. rsync(1)), that's normal
-                ret = False
-            else:
-                po.errfail()
-            pb.wakeup(ret)
-
-    def add(self, e):
-        while True:
-            pb = self.pb
-            try:
-                pb.append(e)
-                return pb
-            except BoxClosedErr:
-                pass
diff --git a/xlators/features/marker/utils/syncdaemon/monitor.py b/xlators/features/marker/utils/syncdaemon/monitor.py
deleted file mode 100644
index b8956dcc2..000000000
--- a/xlators/features/marker/utils/syncdaemon/monitor.py
+++ /dev/null
@@ -1,129 +0,0 @@
-import os
-import sys
-import time
-import signal
-import logging
-from gconf import gconf
-from syncdutils import update_file, select, waitpid, set_term_handler
-
-class Monitor(object):
-    """class which spawns and manages gsyncd workers"""
-
-    def __init__(self):
-        self.state = None
-
-    def set_state(self, state):
-        """set the state that can be used by external agents
-           like glusterd for status reporting"""
-        if state == self.state:
-            return
-        self.state = state
-        logging.info('new state: %s' % state)
-        if getattr(gconf, 'state_file', None):
-            update_file(gconf.state_file, lambda f: f.write(state + '\n'))
-
-    def monitor(self):
-        """the monitor loop
-
-        Basic logic is a blantantly simple blunt heuristics:
-        if spawned client survives 60 secs, it's considered OK.
-        This servers us pretty well as it's not vulneralbe to
-        any kind of irregular behavior of the child...
-
-        ... well, except for one: if children is hung up on
-        waiting for some event, it can survive aeons, still
-        will be defunct. So we tweak the above logic to
-        expect the worker to send us a signal within 60 secs
-        (in the form of closing its end of a pipe). The worker
-        does this when it's done with the setup stage
-        ready to enter the service loop (note it's the setup
-        stage which is vulnerable to hangs -- the full
-        blown worker blows up on EPIPE if the net goes down,
-        due to the keep-alive thread)
-        """
-        def sigcont_handler(*a):
-            """
-            Re-init logging and send group kill signal
-            """
-            md = gconf.log_metadata
-            logging.shutdown()
-            lcls = logging.getLoggerClass()
-            lcls.setup(label=md.get('saved_label'), **md)
-            pid = os.getpid()
-            os.kill(-pid, signal.SIGUSR1)
-        signal.signal(signal.SIGUSR1, lambda *a: ())
-        signal.signal(signal.SIGCONT, sigcont_handler)
-
-        argv = sys.argv[:]
-        for o in ('-N', '--no-daemon', '--monitor'):
-            while o in argv:
-                argv.remove(o)
-        argv.extend(('-N', '-p', ''))
-        argv.insert(0, os.path.basename(sys.executable))
-
-        self.set_state('starting...')
-        ret = 0
-        def nwait(p, o=0):
-            p2, r = waitpid(p, o)
-            if not p2:
-                return
-            return r
-        def exit_signalled(s):
-            """ child teminated due to receipt of SIGUSR1 """
-            return (os.WIFSIGNALED(s) and (os.WTERMSIG(s) == signal.SIGUSR1))
-        def exit_status(s):
-            if os.WIFEXITED(s):
-                return os.WEXITSTATUS(s)
-            return 1
-        conn_timeout = int(gconf.connection_timeout)
-        while ret in (0, 1):
-            logging.info('-' * conn_timeout)
-            logging.info('starting gsyncd worker')
-            pr, pw = os.pipe()
-            cpid = os.fork()
-            if cpid == 0:
-                os.close(pr)
-                os.execv(sys.executable, argv + ['--feedback-fd', str(pw)])
-            os.close(pw)
-            t0 = time.time()
-            so = select((pr,), (), (), conn_timeout)[0]
-            os.close(pr)
-            if so:
-                ret = nwait(cpid, os.WNOHANG)
-                if ret != None:
-                    logging.debug("worker died before establishing connection")
-                else:
-                    logging.debug("worker seems to be connected (?? racy check)")
-                    while time.time() < t0 + conn_timeout:
-                        ret = nwait(cpid, os.WNOHANG)
-                        if ret != None:
-                            logging.debug("worker died in startup phase")
-                            break
-                        time.sleep(1)
-            else:
-                logging.debug("worker not confirmed in %d sec, aborting it" % \
-                              conn_timeout)
-                # relax one SIGTERM by setting a handler that sets back
-                # standard handler
-                set_term_handler(lambda *a: set_term_handler())
-                # give a chance to graceful exit
-                os.kill(-os.getpid(), signal.SIGTERM)
-                time.sleep(1)
-                os.kill(cpid, signal.SIGKILL)
-                ret = nwait(cpid)
-            if ret == None:
-                self.set_state('OK')
-                ret = nwait(cpid)
-            if exit_signalled(ret):
-                ret = 0
-            else:
-                ret = exit_status(ret)
-                if ret in (0,1):
-                    self.set_state('faulty')
-            time.sleep(10)
-        self.set_state('inconsistent')
-        return ret
-
-def monitor():
-    """oh yeah, actually Monitor is used as singleton, too"""
-    return Monitor().monitor()
diff --git a/xlators/features/marker/utils/syncdaemon/repce.py b/xlators/features/marker/utils/syncdaemon/repce.py
deleted file mode 100644
index 755fb61df..000000000
--- a/xlators/features/marker/utils/syncdaemon/repce.py
+++ /dev/null
@@ -1,225 +0,0 @@
-import os
-import sys
-import time
-import logging
-from threading import Condition
-try:
-    import thread
-except ImportError:
-    # py 3
-    import _thread as thread
-try:
-    from Queue import Queue
-except ImportError:
-    # py 3
-    from queue import Queue
-try:
-    import cPickle as pickle
-except ImportError:
-    # py 3
-    import pickle
-
-from syncdutils import Thread, select
-
-pickle_proto = -1
-repce_version = 1.0
-
-def ioparse(i, o):
-    if isinstance(i, int):
-        i = os.fdopen(i)
-    # rely on duck typing for recognizing
-    # streams as that works uniformly
-    # in py2 and py3
-    if hasattr(o, 'fileno'):
-        o = o.fileno()
-    return (i, o)
-
-def send(out, *args):
-    """pickle args and write out wholly in one syscall
-
-    ie. not use the ability of pickle to dump directly to
-    a stream, as that would potentially mess up messages
-    by interleaving them
-    """
-    os.write(out, pickle.dumps(args, pickle_proto))
-
-def recv(inf):
-    """load an object from input stream"""
-    return pickle.load(inf)
-
-
-class RepceServer(object):
-    """RePCe is Hungarian for canola, http://hu.wikipedia.org/wiki/Repce
-
-    ... also our homebrewed RPC backend where the transport layer is
-    reduced to a pair of filehandles.
-
-    This is the server component.
-    """
-
-    def __init__(self, obj, i, o, wnum=6):
-        """register a backend object .obj to which incoming messages
-           are dispatched, also incoming/outcoming streams
-        """
-        self.obj = obj
-        self.inf, self.out = ioparse(i, o)
-        self.wnum = wnum
-        self.q = Queue()
-
-    def service_loop(self):
-        """fire up worker threads, get messages and dispatch among them"""
-        for i in range(self.wnum):
-            t = Thread(target=self.worker)
-            t.start()
-        try:
-            while True:
-                self.q.put(recv(self.inf))
-        except EOFError:
-            logging.info("terminating on reaching EOF.")
-
-    def worker(self):
-        """life of a worker
-
-        Get message, extract its id, method name and arguments
-        (kwargs not supported), call method on .obj.
-        Send back message id + return value.
-        If method call throws an exception, rescue it, and send
-        back the exception as result (with flag marking it as
-        exception).
-        """
-        while True:
-            in_data = self.q.get(True)
-            rid = in_data[0]
-            rmeth = in_data[1]
-            exc = False
-            if rmeth == '__repce_version__':
-                res = repce_version
-            else:
-              try:
-                  res = getattr(self.obj, rmeth)(*in_data[2:])
-              except:
-                  res = sys.exc_info()[1]
-                  exc = True
-                  logging.exception("call failed: ")
-            send(self.out, rid, exc, res)
-
-
-class RepceJob(object):
-    """class representing message status we can use
-    for waiting on reply"""
-
-    def __init__(self, cbk):
-        """
-        - .rid: (process-wise) unique id
-        - .cbk: what we do upon receiving reply
-        """
-        self.rid = (os.getpid(), thread.get_ident(), time.time())
-        self.cbk = cbk
-        self.lever = Condition()
-        self.done = False
-
-    def __repr__(self):
-        return ':'.join([str(x) for x in self.rid])
-
-    def wait(self):
-        self.lever.acquire()
-        if not self.done:
-            self.lever.wait()
-        self.lever.release()
-        return self.result
-
-    def wakeup(self, data):
-        self.result = data
-        self.lever.acquire()
-        self.done = True
-        self.lever.notify()
-        self.lever.release()
-
-
-class RepceClient(object):
-    """RePCe is Hungarian for canola, http://hu.wikipedia.org/wiki/Repce
-
-    ... also our homebrewed RPC backend where the transport layer is
-    reduced to a pair of filehandles.
-
-    This is the client component.
-    """
-
-    def __init__(self, i, o):
-        self.inf, self.out = ioparse(i, o)
-        self.jtab = {}
-        t = Thread(target = self.listen)
-        t.start()
-
-    def listen(self):
-        while True:
-            select((self.inf,), (), ())
-            rid, exc, res = recv(self.inf)
-            rjob = self.jtab.pop(rid)
-            if rjob.cbk:
-                rjob.cbk(rjob, [exc, res])
-
-    def push(self, meth, *args, **kw):
-        """wrap arguments in a RepceJob, send them to server
-           and return the RepceJob
-
-           @cbk to pass on RepceJob can be given as kwarg.
-        """
-        cbk = kw.get('cbk')
-        if not cbk:
-            def cbk(rj, res):
-                if res[0]:
-                    raise res[1]
-        rjob = RepceJob(cbk)
-        self.jtab[rjob.rid] = rjob
-        logging.debug("call %s %s%s ..." % (repr(rjob), meth, repr(args)))
-        send(self.out, rjob.rid, meth, *args)
-        return rjob
-
-    def __call__(self, meth, *args):
-        """RePCe client is callabe, calling it implements a synchronous remote call
-
-        We do a .push with a cbk which does a wakeup upon receiving anwser, then wait
-        on the RepceJob.
-        """
-        rjob = self.push(meth, *args, **{'cbk': lambda rj, res: rj.wakeup(res)})
-        exc, res = rjob.wait()
-        if exc:
-            logging.error('call %s (%s) failed on peer with %s' % (repr(rjob), meth, str(type(res).__name__)))
-            raise res
-        logging.debug("call %s %s -> %s" % (repr(rjob), meth, repr(res)))
-        return res
-
-    class mprx(object):
-        """method proxy, standard trick to implement rubyesque method_missing
-           in Python
-
-        A class is a closure factory, you know what I mean, or go read some SICP.
-        """
-        def __init__(self, ins, meth):
-            self.ins = ins
-            self.meth = meth
-
-        def __call__(self, *a):
-            return self.ins(self.meth, *a)
-
-    def __getattr__(self, meth):
-        """this implements transparent method dispatch to remote object,
-           so that you don't need to call the RepceClient instance like
-
-             rclient('how_old_are_you_if_born_in', 1979)
-
-           but you can make it into an ordinary method call like
-
-             rclient.how_old_are_you_if_born_in(1979)
-        """
-        return self.mprx(self, meth)
-
-    def __version__(self):
-        """used in handshake to verify compatibility"""
-        d = {'proto': self('__repce_version__')}
-        try:
-            d['object'] = self('version')
-        except AttributeError:
-            pass
-        return d
diff --git a/xlators/features/marker/utils/syncdaemon/resource.py b/xlators/features/marker/utils/syncdaemon/resource.py
deleted file mode 100644
index adcf55859..000000000
--- a/xlators/features/marker/utils/syncdaemon/resource.py
+++ /dev/null
@@ -1,970 +0,0 @@
-import re
-import os
-import sys
-import stat
-import time
-import fcntl
-import errno
-import struct
-import socket
-import logging
-import tempfile
-import threading
-import subprocess
-from errno import EEXIST, ENOENT, ENODATA, ENOTDIR, ELOOP, EISDIR
-from select import error as SelectError
-
-from gconf import gconf
-import repce
-from repce import RepceServer, RepceClient
-from  master import gmaster_builder
-import syncdutils
-from syncdutils import GsyncdError, select, privileged, boolify
-
-UrlRX  = re.compile('\A(\w+)://([^ *?[]*)\Z')
-HostRX = re.compile('[a-z\d](?:[a-z\d.-]*[a-z\d])?', re.I)
-UserRX = re.compile("[\w!\#$%&'*+-\/=?^_`{|}~]+")
-
-def sup(x, *a, **kw):
-    """a rubyesque "super" for python ;)
-
-    invoke caller method in parent class with given args.
-    """
-    return getattr(super(type(x), x), sys._getframe(1).f_code.co_name)(*a, **kw)
-
-def desugar(ustr):
-    """transform sugared url strings to standard <scheme>://<urlbody> form
-
-    parsing logic enforces the constraint that sugared forms should contatin
-    a ':' or a '/', which ensures that sugared urls do not conflict with
-    gluster volume names.
-    """
-    m = re.match('([^:]*):(.*)', ustr)
-    if m:
-        if not m.groups()[0]:
-            return "gluster://localhost" + ustr
-        elif '@' in m.groups()[0] or re.search('[:/]', m.groups()[1]):
-            return "ssh://" + ustr
-        else:
-            return "gluster://" + ustr
-    else:
-        if ustr[0] != '/':
-            raise GsyncdError("cannot resolve sugared url '%s'" % ustr)
-        ap = os.path.normpath(ustr)
-        if ap.startswith('//'):
-            ap = ap[1:]
-        return "file://" + ap
-
-def gethostbyname(hnam):
-    """gethostbyname wrapper"""
-    try:
-        return socket.gethostbyname(hnam)
-    except socket.gaierror:
-        ex = sys.exc_info()[1]
-        raise GsyncdError("failed to resolve %s: %s" % \
-                          (hnam, ex.strerror))
-
-def parse_url(ustr):
-    """instantiate an url object by scheme-to-class dispatch
-
-    The url classes taken into consideration are the ones in
-    this module whose names are full-caps.
-    """
-    m = UrlRX.match(ustr)
-    if not m:
-        ustr = desugar(ustr)
-    m = UrlRX.match(ustr)
-    if not m:
-        raise GsyncdError("malformed url")
-    sch, path = m.groups()
-    this = sys.modules[__name__]
-    if not hasattr(this, sch.upper()):
-        raise GsyncdError("unknown url scheme " + sch)
-    return getattr(this, sch.upper())(path)
-
-
-class _MetaXattr(object):
-    """singleton class, a lazy wrapper around the
-    libcxattr module
-
-    libcxattr (a heavy import due to ctypes) is
-    loaded only when when the single
-    instance is tried to be used.
-
-    This reduces runtime for those invocations
-    which do not need filesystem manipulation
-    (eg. for config, url parsing)
-    """
-
-    def __getattr__(self, meth):
-        from libcxattr import Xattr as LXattr
-        xmeth = [ m for m in dir(LXattr) if m[0] != '_' ]
-        if not meth in xmeth:
-            return
-        for m in xmeth:
-            setattr(self, m, getattr(LXattr, m))
-        return getattr(self, meth)
-
-Xattr = _MetaXattr()
-
-
-class Popen(subprocess.Popen):
-    """customized subclass of subprocess.Popen with a ring
-    buffer for children error output"""
-
-    @classmethod
-    def init_errhandler(cls):
-        """start the thread which handles children's error output"""
-        cls.errstore = {}
-        def tailer():
-            while True:
-                errstore = cls.errstore.copy()
-                try:
-                    poe, _ ,_ = select([po.stderr for po in errstore], [], [], 1)
-                except (ValueError, SelectError):
-                    continue
-                for po in errstore:
-                    if po.stderr not in poe:
-                        continue
-                    po.lock.acquire()
-                    try:
-                        if po.on_death_row:
-                            continue
-                        la = errstore[po]
-                        try:
-                            fd = po.stderr.fileno()
-                        except ValueError:  # file is already closed
-                            continue
-                        l = os.read(fd, 1024)
-                        if not l:
-                            continue
-                        tots = len(l)
-                        for lx in la:
-                            tots += len(lx)
-                        while tots > 1<<20 and la:
-                            tots -= len(la.pop(0))
-                        la.append(l)
-                    finally:
-                        po.lock.release()
-        t = syncdutils.Thread(target = tailer)
-        t.start()
-        cls.errhandler = t
-
-    @classmethod
-    def fork(cls):
-        """fork wrapper that restarts errhandler thread in child"""
-        pid = os.fork()
-        if not pid:
-            cls.init_errhandler()
-        return pid
-
-    def __init__(self, args, *a, **kw):
-        """customizations for subprocess.Popen instantiation
-
-        - 'close_fds' is taken to be the default
-        - if child's stderr is chosen to be managed,
-          register it with the error handler thread
-        """
-        self.args = args
-        if 'close_fds' not in kw:
-            kw['close_fds'] = True
-        self.lock = threading.Lock()
-        self.on_death_row = False
-        try:
-            sup(self, args, *a, **kw)
-        except:
-            ex = sys.exc_info()[1]
-            if not isinstance(ex, OSError):
-                raise
-            raise GsyncdError("""execution of "%s" failed with %s (%s)""" % \
-                              (args[0], errno.errorcode[ex.errno], os.strerror(ex.errno)))
-        if kw.get('stderr') == subprocess.PIPE:
-            assert(getattr(self, 'errhandler', None))
-            self.errstore[self] = []
-
-    def errlog(self):
-        """make a log about child's failure event"""
-        filling = ""
-        if self.elines:
-            filling = ", saying:"
-        logging.error("""command "%s" returned with %s%s""" % \
-                      (" ".join(self.args), repr(self.returncode), filling))
-        lp = ''
-        def logerr(l):
-            logging.error(self.args[0] + "> " + l)
-        for l in self.elines:
-            ls = l.split('\n')
-            ls[0] = lp + ls[0]
-            lp = ls.pop()
-            for ll in ls:
-                logerr(ll)
-        if lp:
-            logerr(lp)
-
-    def errfail(self):
-        """fail nicely if child did not terminate with success"""
-        self.errlog()
-        syncdutils.finalize(exval = 1)
-
-    def terminate_geterr(self, fail_on_err = True):
-        """kill child, finalize stderr harvesting (unregister
-        from errhandler, set up .elines), fail on error if
-        asked for
-        """
-        self.lock.acquire()
-        try:
-            self.on_death_row = True
-        finally:
-            self.lock.release()
-        elines = self.errstore.pop(self)
-        if self.poll() == None:
-            self.terminate()
-            if self.poll() == None:
-                time.sleep(0.1)
-                self.kill()
-                self.wait()
-        while True:
-            if not select([self.stderr],[],[],0.1)[0]:
-                break
-            b = os.read(self.stderr.fileno(), 1024)
-            if b:
-                elines.append(b)
-            else:
-                break
-        self.stderr.close()
-        self.elines = elines
-        if fail_on_err and self.returncode != 0:
-            self.errfail()
-
-
-class Server(object):
-    """singleton implemening those filesystem access primitives
-       which are needed for geo-replication functionality
-
-    (Singleton in the sense it's a class which has only static
-    and classmethods and is used directly, without instantiation.)
-    """
-
-    GX_NSPACE = (privileged() and "trusted" or "system") + ".glusterfs"
-    NTV_FMTSTR = "!" + "B"*19 + "II"
-    FRGN_XTRA_FMT = "I"
-    FRGN_FMTSTR = NTV_FMTSTR + FRGN_XTRA_FMT
-
-    def _pathguard(f):
-        """decorator method that checks
-        the path argument of the decorated
-        functions to make sure it does not
-        point out of the managed tree
-        """
-
-        fc = getattr(f, 'func_code', None)
-        if not fc:
-            # python 3
-            fc = f.__code__
-        pi = list(fc.co_varnames).index('path')
-        def ff(*a):
-            path = a[pi]
-            ps = path.split('/')
-            if path[0] == '/' or '..' in ps:
-                raise ValueError('unsafe path')
-            return f(*a)
-        return ff
-
-    @staticmethod
-    @_pathguard
-    def entries(path):
-        """directory entries in an array"""
-        # prevent symlinks being followed
-        if not stat.S_ISDIR(os.lstat(path).st_mode):
-            raise OSError(ENOTDIR, os.strerror(ENOTDIR))
-        return os.listdir(path)
-
-    @classmethod
-    @_pathguard
-    def purge(cls, path, entries=None):
-        """force-delete subtrees
-
-        If @entries is not specified, delete
-        the whole subtree under @path (including
-        @path).
-
-        Otherwise, @entries should be a
-        a sequence of children of @path, and
-        the effect is identical with a joint
-        @entries-less purge on them, ie.
-
-        for e in entries:
-            cls.purge(os.path.join(path, e))
-        """
-        me_also = entries == None
-        if not entries:
-            try:
-                # if it's a symlink, prevent
-                # following it
-                try:
-                    os.unlink(path)
-                    return
-                except OSError:
-                    ex = sys.exc_info()[1]
-                    if ex.errno == EISDIR:
-                        entries = os.listdir(path)
-                    else:
-                        raise
-            except OSError:
-                ex = sys.exc_info()[1]
-                if ex.errno in (ENOTDIR, ENOENT, ELOOP):
-                    try:
-                        os.unlink(path)
-                        return
-                    except OSError:
-                        ex = sys.exc_info()[1]
-                        if ex.errno == ENOENT:
-                            return
-                        raise
-                else:
-                    raise
-        for e in entries:
-            cls.purge(os.path.join(path, e))
-        if me_also:
-            os.rmdir(path)
-
-    @classmethod
-    @_pathguard
-    def _create(cls, path, ctor):
-        """path creation backend routine"""
-        try:
-            ctor(path)
-        except OSError:
-            ex = sys.exc_info()[1]
-            if ex.errno == EEXIST:
-                cls.purge(path)
-                return ctor(path)
-            raise
-
-    @classmethod
-    @_pathguard
-    def mkdir(cls, path):
-        cls._create(path, os.mkdir)
-
-    @classmethod
-    @_pathguard
-    def symlink(cls, lnk, path):
-        cls._create(path, lambda p: os.symlink(lnk, p))
-
-    @classmethod
-    @_pathguard
-    def xtime(cls, path, uuid):
-        """query xtime extended attribute
-
-        Return xtime of @path for @uuid as a pair of integers.
-        "Normal" errors due to non-existent @path or extended attribute
-        are tolerated and errno is returned in such a case.
-        """
-
-        try:
-            return struct.unpack('!II', Xattr.lgetxattr(path, '.'.join([cls.GX_NSPACE, uuid, 'xtime']), 8))
-        except OSError:
-            ex = sys.exc_info()[1]
-            if ex.errno in (ENOENT, ENODATA, ENOTDIR):
-                return ex.errno
-            else:
-                raise
-
-    @classmethod
-    def xtime_vec(cls, path, *uuids):
-        """vectored version of @xtime
-
-        accepts a list of uuids and returns a dictionary
-        with uuid as key(s) and xtime as value(s)
-        """
-        xt = {}
-        for uuid in uuids:
-            xtu = cls.xtime(path, uuid)
-            if xtu == ENODATA:
-                xtu = None
-            if isinstance(xtu, int):
-                return xtu
-            xt[uuid] = xtu
-        return xt
-
-    @classmethod
-    @_pathguard
-    def set_xtime(cls, path, uuid, mark):
-        """set @mark as xtime for @uuid on @path"""
-        Xattr.lsetxattr(path, '.'.join([cls.GX_NSPACE, uuid, 'xtime']), struct.pack('!II', *mark))
-
-    @classmethod
-    def set_xtime_vec(cls, path, mark_dct):
-        """vectored (or dictered) version of set_xtime
-
-        ignore values that match @ignore
-        """
-        for u,t in mark_dct.items():
-            cls.set_xtime(path, u, t)
-
-    @staticmethod
-    @_pathguard
-    def setattr(path, adct):
-        """set file attributes
-
-        @adct is a dict, where 'own', 'mode' and 'times'
-        keys are looked for and values used to perform
-        chown, chmod or utimes on @path.
-        """
-        own = adct.get('own')
-        if own:
-            os.lchown(path, *own)
-        mode = adct.get('mode')
-        if mode:
-            os.chmod(path, stat.S_IMODE(mode))
-        times = adct.get('times')
-        if times:
-            os.utime(path, times)
-
-    @staticmethod
-    def pid():
-        return os.getpid()
-
-    last_keep_alive = 0
-    @classmethod
-    def keep_alive(cls, dct):
-        """process keepalive messages.
-
-        Return keep-alive counter (number of received keep-alive
-        messages).
-
-        Now the "keep-alive" message can also have a payload which is
-        used to set a foreign volume-mark on the underlying file system.
-        """
-        if dct:
-            key = '.'.join([cls.GX_NSPACE, 'volume-mark', dct['uuid']])
-            val = struct.pack(cls.FRGN_FMTSTR,
-                              *(dct['version']  +
-                                tuple(int(x,16) for x in re.findall('(?:[\da-f]){2}', dct['uuid'])) +
-                                (dct['retval'],) + dct['volume_mark'][0:2] + (dct['timeout'],)))
-            Xattr.lsetxattr('.', key, val)
-        cls.last_keep_alive += 1
-        return cls.last_keep_alive
-
-    @staticmethod
-    def version():
-        """version used in handshake"""
-        return 1.0
-
-
-class SlaveLocal(object):
-    """mix-in class to implement some factes of a slave server
-
-    ("mix-in" is sort of like "abstract class", ie. it's not
-    instantiated just included in the ancesty DAG. I use "mix-in"
-    to indicate that it's not used as an abstract base class,
-    rather just taken in to implement additional functionality
-    on the basis of the assumed availability of certain interfaces.)
-    """
-
-    def can_connect_to(self, remote):
-        """determine our position in the connectibility matrix"""
-        return not remote
-
-    def service_loop(self):
-        """start a RePCe server serving self's server
-
-        stop servicing if a timeout is configured and got no
-        keep-alime in that inteval
-        """
-
-        if boolify(gconf.use_rsync_xattrs) and not privileged():
-            raise GsyncdError("using rsync for extended attributes is not supported")
-
-        repce = RepceServer(self.server, sys.stdin, sys.stdout, int(gconf.sync_jobs))
-        t = syncdutils.Thread(target=lambda: (repce.service_loop(),
-                                              syncdutils.finalize()))
-        t.start()
-        logging.info("slave listening")
-        if gconf.timeout and int(gconf.timeout) > 0:
-            while True:
-                lp = self.server.last_keep_alive
-                time.sleep(int(gconf.timeout))
-                if lp == self.server.last_keep_alive:
-                    logging.info("connection inactive for %d seconds, stopping" % int(gconf.timeout))
-                    break
-        else:
-            select((), (), ())
-
-class SlaveRemote(object):
-    """mix-in class to implement an interface to a remote slave"""
-
-    def connect_remote(self, rargs=[], **opts):
-        """connects to a remote slave
-
-        Invoke an auxiliary utility (slave gsyncd, possibly wrapped)
-        which sets up the connection and set up a RePCe client to
-        communicate throuh its stdio.
-        """
-        slave = opts.get('slave', self.url)
-        extra_opts = []
-        so = getattr(gconf, 'session_owner', None)
-        if so:
-            extra_opts += ['--session-owner', so]
-        if boolify(gconf.use_rsync_xattrs):
-            extra_opts.append('--use-rsync-xattrs')
-        po = Popen(rargs + gconf.remote_gsyncd.split() + extra_opts + \
-                   ['-N', '--listen', '--timeout', str(gconf.timeout), slave],
-                   stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
-        gconf.transport = po
-        return self.start_fd_client(po.stdout, po.stdin, **opts)
-
-    def start_fd_client(self, i, o, **opts):
-        """set up RePCe client, handshake with server
-
-        It's cut out as a separate method to let
-        subclasses hook into client startup
-        """
-        self.server = RepceClient(i, o)
-        rv = self.server.__version__()
-        exrv = {'proto': repce.repce_version, 'object': Server.version()}
-        da0 = (rv, exrv)
-        da1 = ({}, {})
-        for i in range(2):
-            for k, v in da0[i].iteritems():
-                da1[i][k] = int(v)
-        if da1[0] != da1[1]:
-            raise GsyncdError("RePCe major version mismatch: local %s, remote %s" % (exrv, rv))
-
-    def rsync(self, files, *args):
-        """invoke rsync"""
-        if not files:
-            raise GsyncdError("no files to sync")
-        logging.debug("files: " + ", ".join(files))
-        argv = gconf.rsync_command.split() + \
-               ['-aR0', '--files-from=-', '--super', '--numeric-ids', '--no-implied-dirs'] + \
-               gconf.rsync_options.split() + (boolify(gconf.use_rsync_xattrs) and ['--xattrs'] or []) + \
-               ['.'] + list(args)
-        po = Popen(argv, stdin=subprocess.PIPE, stderr=subprocess.PIPE)
-        for f in files:
-            po.stdin.write(f)
-            po.stdin.write('\0')
-        po.stdin.close()
-        po.wait()
-        po.terminate_geterr(fail_on_err = False)
-        return po
-
-
-class AbstractUrl(object):
-    """abstract base class for url scheme classes"""
-
-    def __init__(self, path, pattern):
-        m = re.search(pattern, path)
-        if not m:
-            raise GsyncdError("malformed path")
-        self.path = path
-        return m.groups()
-
-    @property
-    def scheme(self):
-        return type(self).__name__.lower()
-
-    def canonical_path(self):
-        return self.path
-
-    def get_url(self, canonical=False, escaped=False):
-        """format self's url in various styles"""
-        if canonical:
-            pa = self.canonical_path()
-        else:
-            pa = self.path
-        u = "://".join((self.scheme, pa))
-        if escaped:
-            u = syncdutils.escape(u)
-        return u
-
-    @property
-    def url(self):
-        return self.get_url()
-
-
-  ### Concrete resource classes ###
-
-
-class FILE(AbstractUrl, SlaveLocal, SlaveRemote):
-    """scheme class for file:// urls
-
-    can be used to represent a file slave server
-    on slave side, or interface to a remote file
-    file server on master side
-    """
-
-    class FILEServer(Server):
-        """included server flavor"""
-        pass
-
-    server = FILEServer
-
-    def __init__(self, path):
-        sup(self, path, '^/')
-
-    def connect(self):
-        """inhibit the resource beyond"""
-        os.chdir(self.path)
-
-    def rsync(self, files):
-        return sup(self, files, self.path)
-
-
-class GLUSTER(AbstractUrl, SlaveLocal, SlaveRemote):
-    """scheme class for gluster:// urls
-
-    can be used to represent a gluster slave server
-    on slave side, or interface to a remote gluster
-    slave on master side, or to represent master
-    (slave-ish features come from the mixins, master
-    functionality is outsourced to GMaster from master)
-    """
-
-    class GLUSTERServer(Server):
-        "server enhancements for a glusterfs backend"""
-
-        @classmethod
-        def _attr_unpack_dict(cls, xattr, extra_fields = ''):
-            """generic volume mark fetching/parsing backed"""
-            fmt_string = cls.NTV_FMTSTR + extra_fields
-            buf = Xattr.lgetxattr('.', xattr, struct.calcsize(fmt_string))
-            vm = struct.unpack(fmt_string, buf)
-            m = re.match('(.{8})(.{4})(.{4})(.{4})(.{12})', "".join(['%02x' % x for x in vm[2:18]]))
-            uuid = '-'.join(m.groups())
-            volinfo = {  'version': vm[0:2],
-                         'uuid'   : uuid,
-                         'retval' : vm[18],
-                         'volume_mark': vm[19:21],
-                      }
-            if extra_fields:
-                return volinfo, vm[-len(extra_fields):]
-            else:
-                return volinfo
-
-        @classmethod
-        def foreign_volume_infos(cls):
-            """return list of valid (not expired) foreign volume marks"""
-            dict_list = []
-            xattr_list = Xattr.llistxattr_buf('.')
-            for ele in xattr_list:
-                if ele.find('.'.join([cls.GX_NSPACE, 'volume-mark', ''])) == 0:
-                    d, x = cls._attr_unpack_dict(ele, cls.FRGN_XTRA_FMT)
-                    now = int(time.time())
-                    if x[0] > now:
-                        logging.debug("volinfo[%s] expires: %d (%d sec later)" % \
-                                      (d['uuid'], x[0], x[0] - now))
-                        d['timeout'] = x[0]
-                        dict_list.append(d)
-                    else:
-                        try:
-                            Xattr.lremovexattr('.', ele)
-                        except OSError:
-                            pass
-            return dict_list
-
-        @classmethod
-        def native_volume_info(cls):
-            """get the native volume mark of the underlying gluster volume"""
-            try:
-                return cls._attr_unpack_dict('.'.join([cls.GX_NSPACE, 'volume-mark']))
-            except OSError:
-                ex = sys.exc_info()[1]
-                if ex.errno != ENODATA:
-                    raise
-
-    server = GLUSTERServer
-
-    def __init__(self, path):
-        self.host, self.volume = sup(self, path, '^(%s):(.+)' % HostRX.pattern)
-
-    def canonical_path(self):
-        return ':'.join([gethostbyname(self.host), self.volume])
-
-    def can_connect_to(self, remote):
-        """determine our position in the connectibility matrix"""
-        return True
-
-    class Mounter(object):
-        """Abstract base class for mounter backends"""
-
-        def __init__(self, params):
-            self.params = params
-            self.mntpt = None
-
-        @classmethod
-        def get_glusterprog(cls):
-            return os.path.join(gconf.gluster_command_dir, cls.glusterprog)
-
-        def umount_l(self, d):
-            """perform lazy umount"""
-            po = Popen(self.make_umount_argv(d), stderr=subprocess.PIPE)
-            po.wait()
-            return po
-
-        @classmethod
-        def make_umount_argv(cls, d):
-            raise NotImplementedError
-
-        def make_mount_argv(self, *a):
-            raise NotImplementedError
-
-        def cleanup_mntpt(self, *a):
-            pass
-
-        def handle_mounter(self, po):
-            po.wait()
-
-        def inhibit(self, *a):
-            """inhibit a gluster filesystem
-
-            Mount glusterfs over a temporary mountpoint,
-            change into the mount, and lazy unmount the
-            filesystem.
-            """
-
-            mpi, mpo = os.pipe()
-            mh = Popen.fork()
-            if mh:
-                os.close(mpi)
-                fcntl.fcntl(mpo, fcntl.F_SETFD, fcntl.FD_CLOEXEC)
-                d = None
-                margv = self.make_mount_argv(*a)
-                if self.mntpt:
-                    # mntpt is determined pre-mount
-                    d = self.mntpt
-                    os.write(mpo, d + '\0')
-                po = Popen(margv, **self.mountkw)
-                self.handle_mounter(po)
-                po.terminate_geterr()
-                logging.debug('auxiliary glusterfs mount in place')
-                if not d:
-                    # mntpt is determined during mount
-                    d = self.mntpt
-                    os.write(mpo, d + '\0')
-                os.write(mpo, 'M')
-                t = syncdutils.Thread(target=lambda: os.chdir(d))
-                t.start()
-                tlim = gconf.starttime + int(gconf.connection_timeout)
-                while True:
-                    if not t.isAlive():
-                        break
-                    if time.time() >= tlim:
-                        syncdutils.finalize(exval = 1)
-                    time.sleep(1)
-                os.close(mpo)
-                _, rv = syncdutils.waitpid(mh, 0)
-                if rv:
-                    rv = (os.WIFEXITED(rv) and os.WEXITSTATUS(rv) or 0) - \
-                         (os.WIFSIGNALED(rv) and os.WTERMSIG(rv) or 0)
-                    logging.warn('stale mount possibly left behind on ' + d)
-                    raise GsyncdError("cleaning up temp mountpoint %s failed with status %d" % \
-                                      (d, rv))
-            else:
-                rv = 0
-                try:
-                    os.setsid()
-                    os.close(mpo)
-                    mntdata = ''
-                    while True:
-                        c = os.read(mpi, 1)
-                        if not c:
-                            break
-                        mntdata += c
-                    if mntdata:
-                        mounted = False
-                        if mntdata[-1] == 'M':
-                            mntdata = mntdata[:-1]
-                            assert(mntdata)
-                            mounted = True
-                        assert(mntdata[-1] == '\0')
-                        mntpt = mntdata[:-1]
-                        assert(mntpt)
-                        if mounted:
-                            po = self.umount_l(mntpt)
-                            po.terminate_geterr(fail_on_err = False)
-                            if po.returncode != 0:
-                                po.errlog()
-                                rv = po.returncode
-                        self.cleanup_mntpt(mntpt)
-                except:
-                    logging.exception('mount cleanup failure:')
-                    rv = 200
-                os._exit(rv)
-            logging.debug('auxiliary glusterfs mount prepared')
-
-    class DirectMounter(Mounter):
-        """mounter backend which calls mount(8), umount(8) directly"""
-
-        mountkw = {'stderr': subprocess.PIPE}
-        glusterprog = 'glusterfs'
-
-        @staticmethod
-        def make_umount_argv(d):
-            return ['umount', '-l', d]
-
-        def make_mount_argv(self):
-            self.mntpt = tempfile.mkdtemp(prefix = 'gsyncd-aux-mount-')
-            return [self.get_glusterprog()] + ['--' + p for p in self.params] + [self.mntpt]
-
-        def cleanup_mntpt(self, mntpt = None):
-            if not mntpt:
-                mntpt = self.mntpt
-            os.rmdir(mntpt)
-
-    class MountbrokerMounter(Mounter):
-        """mounter backend using the mountbroker gluster service"""
-
-        mountkw = {'stderr': subprocess.PIPE, 'stdout': subprocess.PIPE}
-        glusterprog = 'gluster'
-
-        @classmethod
-        def make_cli_argv(cls):
-            return [cls.get_glusterprog()] + gconf.gluster_cli_options.split() + ['system::']
-
-        @classmethod
-        def make_umount_argv(cls, d):
-            return cls.make_cli_argv() + ['umount', d, 'lazy']
-
-        def make_mount_argv(self, label):
-            return self.make_cli_argv() + \
-                   ['mount', label, 'user-map-root=' + syncdutils.getusername()] + self.params
-
-        def handle_mounter(self, po):
-            self.mntpt = po.stdout.readline()[:-1]
-            po.stdout.close()
-            sup(self, po)
-            if po.returncode != 0:
-                # if cli terminated with error due to being
-                # refused by glusterd, what it put
-                # out on stdout is a diagnostic message
-                logging.error('glusterd answered: %s' % self.mntpt)
-
-    def connect(self):
-        """inhibit the resource beyond
-
-        Choose mounting backend (direct or mountbroker),
-        set up glusterfs parameters and perform the mount
-        with given backend
-        """
-
-        label = getattr(gconf, 'mountbroker', None)
-        if not label and not privileged():
-            label = syncdutils.getusername()
-        mounter = label and self.MountbrokerMounter or self.DirectMounter
-        params = gconf.gluster_params.split() + \
-                   (gconf.gluster_log_level and ['log-level=' + gconf.gluster_log_level] or []) + \
-                   ['log-file=' + gconf.gluster_log_file, 'volfile-server=' + self.host,
-                    'volfile-id=' + self.volume, 'client-pid=-1']
-        mounter(params).inhibit(*[l for l in [label] if l])
-
-    def connect_remote(self, *a, **kw):
-        sup(self, *a, **kw)
-        self.slavedir = "/proc/%d/cwd" % self.server.pid()
-
-    def service_loop(self, *args):
-        """enter service loop
-
-        - if slave given, instantiate GMaster and
-          pass control to that instance, which implements
-          master behavior
-        - else do that's what's inherited
-        """
-        if args:
-            gmaster_builder()(self, args[0]).crawl_loop()
-        else:
-            sup(self, *args)
-
-    def rsync(self, files):
-        return sup(self, files, self.slavedir)
-
-
-class SSH(AbstractUrl, SlaveRemote):
-    """scheme class for ssh:// urls
-
-    interface to remote slave on master side
-    implementing an ssh based proxy
-    """
-
-    def __init__(self, path):
-        self.remote_addr, inner_url = sup(self, path,
-                                          '^((?:%s@)?%s):(.+)' % tuple([ r.pattern for r in (UserRX, HostRX) ]))
-        self.inner_rsc = parse_url(inner_url)
-
-    def canonical_path(self):
-        m = re.match('([^@]+)@(.+)', self.remote_addr)
-        if m:
-            u, h = m.groups()
-        else:
-            u, h = syncdutils.getusername(), self.remote_addr
-        remote_addr = '@'.join([u, gethostbyname(h)])
-        return ':'.join([remote_addr, self.inner_rsc.get_url(canonical=True)])
-
-    def can_connect_to(self, remote):
-        """determine our position in the connectibility matrix"""
-        return False
-
-    def start_fd_client(self, *a, **opts):
-        """customizations for client startup
-
-        - be a no-op if we are to daemonize (client startup is deferred
-          to post-daemon stage)
-        - determine target url for rsync after consulting server
-        """
-        if opts.get('deferred'):
-            return a
-        sup(self, *a)
-        ityp = type(self.inner_rsc)
-        if ityp == FILE:
-            slavepath = self.inner_rsc.path
-        elif ityp == GLUSTER:
-            slavepath = "/proc/%d/cwd" % self.server.pid()
-        else:
-            raise NotImplementedError
-        self.slaveurl = ':'.join([self.remote_addr, slavepath])
-
-    def connect_remote(self, go_daemon=None):
-        """connect to inner slave url through outer ssh url
-
-        Wrap the connecting utility in ssh.
-
-        Much care is put into daemonizing: in that case
-        ssh is started before daemonization, but
-        RePCe client is to be created after that (as ssh
-        interactive password auth would be defeated by
-        a daemonized ssh, while client should be present
-        only in the final process). In that case the action
-        is taken apart to two parts, this method is ivoked
-        once pre-daemon, once post-daemon. Use @go_daemon
-        to deiced what part to perform.
-
-        [NB. ATM gluster product does not makes use of interactive
-        authentication.]
-        """
-        if go_daemon == 'done':
-            return self.start_fd_client(*self.fd_pair)
-        gconf.setup_ssh_ctl(tempfile.mkdtemp(prefix='gsyncd-aux-ssh-'))
-        deferred = go_daemon == 'postconn'
-        ret = sup(self, gconf.ssh_command.split() + gconf.ssh_ctl_args + [self.remote_addr], slave=self.inner_rsc.url, deferred=deferred)
-        if deferred:
-            # send a message to peer so that we can wait for
-            # the answer from which we know connection is
-            # established and we can proceed with daemonization
-            # (doing that too early robs the ssh passwd prompt...)
-            # However, we'd better not start the RepceClient
-            # before daemonization (that's not preserved properly
-            # in daemon), we just do a an ad-hoc linear put/get.
-            i, o = ret
-            inf = os.fdopen(i)
-            repce.send(o, None, '__repce_version__')
-            select((inf,), (), ())
-            repce.recv(inf)
-            # hack hack hack: store a global reference to the file
-            # to save it from getting GC'd which implies closing it
-            gconf.permanent_handles.append(inf)
-            self.fd_pair = (i, o)
-            return 'should'
-
-    def rsync(self, files):
-        return sup(self, files, '-e', " ".join(gconf.ssh_command.split() + gconf.ssh_ctl_args),
-                   *(gconf.rsync_ssh_options.split() + [self.slaveurl]))
diff --git a/xlators/features/marker/utils/syncdaemon/syncdutils.py b/xlators/features/marker/utils/syncdaemon/syncdutils.py
deleted file mode 100644
index 3491c0a3c..000000000
--- a/xlators/features/marker/utils/syncdaemon/syncdutils.py
+++ /dev/null
@@ -1,282 +0,0 @@
-import os
-import sys
-import pwd
-import time
-import fcntl
-import shutil
-import logging
-from threading import Lock, Thread as baseThread
-from errno import EACCES, EAGAIN, EPIPE, ENOTCONN, ECONNABORTED, EINTR, errorcode
-from signal import signal, SIGTERM, SIGKILL
-from time import sleep
-import select as oselect
-from os import waitpid as owaitpid
-try:
-    from cPickle import PickleError
-except ImportError:
-    # py 3
-    from pickle import PickleError
-
-from gconf import gconf
-
-try:
-    # py 3
-    from urllib import parse as urllib
-except ImportError:
-    import urllib
-
-def escape(s):
-    """the chosen flavor of string escaping, used all over
-       to turn whatever data to creatable representation"""
-    return urllib.quote_plus(s)
-
-def unescape(s):
-    """inverse of .escape"""
-    return urllib.unquote_plus(s)
-
-def norm(s):
-    if s:
-        return s.replace('-', '_')
-
-def update_file(path, updater, merger = lambda f: True):
-    """update a file in a transaction-like manner"""
-
-    fr = fw = None
-    try:
-        fd = os.open(path, os.O_CREAT|os.O_RDWR)
-        try:
-            fr = os.fdopen(fd, 'r+b')
-        except:
-            os.close(fd)
-            raise
-        fcntl.lockf(fr, fcntl.LOCK_EX)
-        if not merger(fr):
-            return
-
-        tmpp = path + '.tmp.' + str(os.getpid())
-        fd = os.open(tmpp, os.O_CREAT|os.O_EXCL|os.O_WRONLY)
-        try:
-            fw = os.fdopen(fd, 'wb', 0)
-        except:
-            os.close(fd)
-            raise
-        updater(fw)
-        os.fsync(fd)
-        os.rename(tmpp, path)
-    finally:
-        for fx in (fr, fw):
-            if fx:
-                fx.close()
-
-def grabfile(fname, content=None):
-    """open @fname + contest for its fcntl lock
-
-    @content: if given, set the file content to it
-    """
-    # damn those messy open() mode codes
-    fd = os.open(fname, os.O_CREAT|os.O_RDWR)
-    f = os.fdopen(fd, 'r+b', 0)
-    try:
-        fcntl.lockf(f, fcntl.LOCK_EX|fcntl.LOCK_NB)
-    except:
-        ex = sys.exc_info()[1]
-        f.close()
-        if isinstance(ex, IOError) and ex.errno in (EACCES, EAGAIN):
-            # cannot grab, it's taken
-            return
-        raise
-    if content:
-        try:
-            f.truncate()
-            f.write(content)
-        except:
-            f.close()
-            raise
-    gconf.permanent_handles.append(f)
-    return f
-
-def grabpidfile(fname=None, setpid=True):
-    """.grabfile customization for pid files"""
-    if not fname:
-        fname = gconf.pid_file
-    content = None
-    if setpid:
-        content = str(os.getpid()) + '\n'
-    return grabfile(fname, content=content)
-
-final_lock = Lock()
-
-def finalize(*a, **kw):
-    """all those messy final steps we go trough upon termination
-
-    Do away with pidfile, ssh control dir and logging.
-    """
-    final_lock.acquire()
-    if getattr(gconf, 'pid_file', None):
-        rm_pidf = gconf.pid_file_owned
-        if gconf.cpid:
-            # exit path from parent branch of daemonization
-            rm_pidf = False
-            while True:
-                f = grabpidfile(setpid=False)
-                if not f:
-                    # child has already taken over pidfile
-                    break
-                if os.waitpid(gconf.cpid, os.WNOHANG)[0] == gconf.cpid:
-                    # child has terminated
-                    rm_pidf = True
-                    break;
-                time.sleep(0.1)
-        if rm_pidf:
-            try:
-                os.unlink(gconf.pid_file)
-            except:
-                ex = sys.exc_info()[1]
-                if ex.errno == ENOENT:
-                    pass
-                else:
-                    raise
-    if gconf.ssh_ctl_dir and not gconf.cpid:
-        shutil.rmtree(gconf.ssh_ctl_dir)
-    if getattr(gconf, 'state_socket', None):
-        try:
-            os.unlink(gconf.state_socket)
-        except:
-            if sys.exc_info()[0] == OSError:
-                pass
-    if gconf.log_exit:
-        logging.info("exiting.")
-    sys.stdout.flush()
-    sys.stderr.flush()
-    os._exit(kw.get('exval', 0))
-
-def log_raise_exception(excont):
-    """top-level exception handler
-
-    Try to some fancy things to cover up we face with an error.
-    Translate some weird sounding but well understood exceptions
-    into human-friendly lingo
-    """
-    is_filelog = False
-    for h in logging.getLogger().handlers:
-        fno = getattr(getattr(h, 'stream', None), 'fileno', None)
-        if fno and not os.isatty(fno()):
-            is_filelog = True
-
-    exc = sys.exc_info()[1]
-    if isinstance(exc, SystemExit):
-        excont.exval = exc.code or 0
-        raise
-    else:
-        logtag = None
-        if isinstance(exc, GsyncdError):
-            if is_filelog:
-                logging.error(exc.args[0])
-            sys.stderr.write('failure: ' + exc.args[0] + '\n')
-        elif isinstance(exc, PickleError) or isinstance(exc, EOFError) or \
-             ((isinstance(exc, OSError) or isinstance(exc, IOError)) and \
-              exc.errno == EPIPE):
-            logging.error('connection to peer is broken')
-            if hasattr(gconf, 'transport'):
-                gconf.transport.wait()
-                gconf.transport.terminate_geterr()
-        elif isinstance(exc, OSError) and exc.errno in (ENOTCONN, ECONNABORTED):
-            logging.error('glusterfs session went down [%s]', errorcode[exc.errno])
-        else:
-            logtag = "FAIL"
-        if not logtag and logging.getLogger().isEnabledFor(logging.DEBUG):
-            logtag = "FULL EXCEPTION TRACE"
-        if logtag:
-            logging.exception(logtag + ": ")
-            sys.stderr.write("failed with %s.\n" % type(exc).__name__)
-        excont.exval = 1
-        sys.exit(excont.exval)
-
-
-class FreeObject(object):
-    """wildcard class for which any attribute can be set"""
-
-    def __init__(self, **kw):
-        for k,v in kw.items():
-            setattr(self, k, v)
-
-class Thread(baseThread):
-    """thread class flavor for gsyncd
-
-    - always a daemon thread
-    - force exit for whole program if thread
-      function coughs up an exception
-    """
-    def __init__(self, *a, **kw):
-        tf = kw.get('target')
-        if tf:
-            def twrap(*aa):
-                excont = FreeObject(exval = 0)
-                try:
-                    tf(*aa)
-                except:
-                    try:
-                        log_raise_exception(excont)
-                    finally:
-                        finalize(exval = excont.exval)
-            kw['target'] = twrap
-        baseThread.__init__(self, *a, **kw)
-        self.setDaemon(True)
-
-class GsyncdError(Exception):
-    pass
-
-def getusername(uid = None):
-    if uid == None:
-        uid = os.geteuid()
-    return pwd.getpwuid(uid).pw_name
-
-def privileged():
-    return os.geteuid() == 0
-
-def boolify(s):
-    """
-    Generic string to boolean converter
-
-    return
-    - Quick return if string 's' is of type bool
-    - True if it's in true_list
-    - False if it's in false_list
-    - Warn if it's not present in either and return False
-    """
-    true_list  = ['true', 'yes', '1', 'on']
-    false_list = ['false', 'no', '0', 'off']
-
-    if isinstance(s, bool):
-        return s
-
-    rv = False
-    lstr = s.lower()
-    if lstr in true_list:
-        rv = True
-    elif not lstr in false_list:
-        logging.warn("Unknown string (%s) in string to boolean conversion defaulting to False\n" % (s))
-
-    return rv
-
-def eintr_wrap(func, exc, *a):
-    """
-    wrapper around syscalls resilient to interrupt caused
-    by signals
-    """
-    while True:
-        try:
-            return func(*a)
-        except exc:
-            ex = sys.exc_info()[1]
-            if not ex.args[0] == EINTR:
-                raise
-
-def select(*a):
-    return eintr_wrap(oselect.select, oselect.error, *a)
-
-def waitpid (*a):
-    return eintr_wrap(owaitpid, OSError, *a)
-
-def set_term_handler(hook=lambda *a: finalize(*a, **{'exval': 1})):
-    signal(SIGTERM, hook)
diff --git a/xlators/features/qemu-block/Makefile.am b/xlators/features/qemu-block/Makefile.am
new file mode 100644
index 000000000..af437a64d
--- /dev/null
+++ b/xlators/features/qemu-block/Makefile.am
@@ -0,0 +1 @@
+SUBDIRS = src
diff --git a/xlators/features/qemu-block/src/Makefile.am b/xlators/features/qemu-block/src/Makefile.am
new file mode 100644
index 000000000..08a7b62a0
--- /dev/null
+++ b/xlators/features/qemu-block/src/Makefile.am
@@ -0,0 +1,155 @@
+if ENABLE_QEMU_BLOCK
+xlator_LTLIBRARIES = qemu-block.la
+xlatordir = $(libdir)/glusterfs/$(PACKAGE_VERSION)/xlator/features
+
+qemu_block_la_LDFLAGS = -module -avoid-version
+qemu_block_la_LIBADD = $(top_builddir)/libglusterfs/src/libglusterfs.la $(GLIB_LIBS) -lz -lrt
+
+qemu_block_la_SOURCES_qemu = \
+	$(CONTRIBDIR)/qemu/qemu-coroutine.c \
+	$(CONTRIBDIR)/qemu/qemu-coroutine-lock.c \
+	$(CONTRIBDIR)/qemu/qemu-coroutine-sleep.c \
+	$(CONTRIBDIR)/qemu/coroutine-ucontext.c \
+	$(CONTRIBDIR)/qemu/block.c \
+	$(CONTRIBDIR)/qemu/nop-symbols.c
+
+qemu_block_la_SOURCES_qemu_util = \
+	$(CONTRIBDIR)/qemu/util/aes.c \
+	$(CONTRIBDIR)/qemu/util/bitmap.c \
+	$(CONTRIBDIR)/qemu/util/bitops.c \
+	$(CONTRIBDIR)/qemu/util/cutils.c \
+	$(CONTRIBDIR)/qemu/util/error.c \
+	$(CONTRIBDIR)/qemu/util/hbitmap.c \
+	$(CONTRIBDIR)/qemu/util/iov.c \
+	$(CONTRIBDIR)/qemu/util/module.c \
+	$(CONTRIBDIR)/qemu/util/oslib-posix.c \
+	$(CONTRIBDIR)/qemu/util/qemu-option.c \
+	$(CONTRIBDIR)/qemu/util/qemu-error.c \
+	$(CONTRIBDIR)/qemu/util/qemu-thread-posix.c \
+	$(CONTRIBDIR)/qemu/util/unicode.c \
+	$(CONTRIBDIR)/qemu/util/hexdump.c
+
+qemu_block_la_SOURCES_qemu_block = \
+	$(CONTRIBDIR)/qemu/block/snapshot.c \
+	$(CONTRIBDIR)/qemu/block/qcow2-cache.c \
+	$(CONTRIBDIR)/qemu/block/qcow2-cluster.c \
+	$(CONTRIBDIR)/qemu/block/qcow2-refcount.c \
+	$(CONTRIBDIR)/qemu/block/qcow2-snapshot.c \
+	$(CONTRIBDIR)/qemu/block/qcow2.c \
+	$(CONTRIBDIR)/qemu/block/qed-check.c \
+	$(CONTRIBDIR)/qemu/block/qed-cluster.c \
+	$(CONTRIBDIR)/qemu/block/qed-gencb.c \
+	$(CONTRIBDIR)/qemu/block/qed-l2-cache.c \
+	$(CONTRIBDIR)/qemu/block/qed-table.c \
+	$(CONTRIBDIR)/qemu/block/qed.c
+
+qemu_block_la_SOURCES_qemu_qobject = \
+	$(CONTRIBDIR)/qemu/qobject/json-lexer.c \
+	$(CONTRIBDIR)/qemu/qobject/json-parser.c \
+	$(CONTRIBDIR)/qemu/qobject/json-streamer.c \
+	$(CONTRIBDIR)/qemu/qobject/qbool.c \
+	$(CONTRIBDIR)/qemu/qobject/qdict.c \
+	$(CONTRIBDIR)/qemu/qobject/qerror.c \
+	$(CONTRIBDIR)/qemu/qobject/qfloat.c \
+	$(CONTRIBDIR)/qemu/qobject/qint.c \
+	$(CONTRIBDIR)/qemu/qobject/qjson.c \
+	$(CONTRIBDIR)/qemu/qobject/qlist.c \
+	$(CONTRIBDIR)/qemu/qobject/qstring.c
+
+qemu_block_la_SOURCES = \
+	$(qemu_block_la_SOURCES_qemu) \
+	$(qemu_block_la_SOURCES_qemu_util) \
+	$(qemu_block_la_SOURCES_qemu_block) \
+	$(qemu_block_la_SOURCES_qemu_qobject) \
+	bdrv-xlator.c \
+	coroutine-synctask.c \
+	bh-syncop.c \
+	monitor-logging.c \
+	clock-timer.c \
+	qemu-block.c \
+	qb-coroutines.c
+
+noinst_HEADERS_qemu = \
+	$(CONTRIBDIR)/qemu/config-host.h \
+	$(CONTRIBDIR)/qemu/qapi-types.h \
+	$(CONTRIBDIR)/qemu/qmp-commands.h \
+	$(CONTRIBDIR)/qemu/trace/generated-tracers.h \
+	$(CONTRIBDIR)/qemu/include/config.h \
+	$(CONTRIBDIR)/qemu/include/glib-compat.h \
+	$(CONTRIBDIR)/qemu/include/qemu-common.h \
+	$(CONTRIBDIR)/qemu/include/trace.h \
+	$(CONTRIBDIR)/qemu/include/block/coroutine.h \
+	$(CONTRIBDIR)/qemu/include/block/aio.h \
+	$(CONTRIBDIR)/qemu/include/block/block.h \
+	$(CONTRIBDIR)/qemu/include/block/block_int.h \
+	$(CONTRIBDIR)/qemu/include/block/blockjob.h \
+	$(CONTRIBDIR)/qemu/include/block/coroutine.h \
+	$(CONTRIBDIR)/qemu/include/block/coroutine_int.h \
+	$(CONTRIBDIR)/qemu/include/block/snapshot.h \
+	$(CONTRIBDIR)/qemu/include/exec/cpu-common.h \
+	$(CONTRIBDIR)/qemu/include/exec/hwaddr.h \
+	$(CONTRIBDIR)/qemu/include/exec/poison.h \
+	$(CONTRIBDIR)/qemu/include/fpu/softfloat.h \
+	$(CONTRIBDIR)/qemu/include/migration/migration.h \
+	$(CONTRIBDIR)/qemu/include/migration/qemu-file.h \
+	$(CONTRIBDIR)/qemu/include/migration/vmstate.h \
+	$(CONTRIBDIR)/qemu/include/monitor/monitor.h \
+	$(CONTRIBDIR)/qemu/include/monitor/readline.h \
+	$(CONTRIBDIR)/qemu/include/qapi/error.h \
+	$(CONTRIBDIR)/qemu/include/qapi/qmp/json-lexer.h \
+	$(CONTRIBDIR)/qemu/include/qapi/qmp/json-parser.h \
+	$(CONTRIBDIR)/qemu/include/qapi/qmp/json-streamer.h \
+	$(CONTRIBDIR)/qemu/include/qapi/qmp/qbool.h \
+	$(CONTRIBDIR)/qemu/include/qapi/qmp/qdict.h \
+	$(CONTRIBDIR)/qemu/include/qapi/qmp/qerror.h \
+	$(CONTRIBDIR)/qemu/include/qapi/qmp/qfloat.h \
+	$(CONTRIBDIR)/qemu/include/qapi/qmp/qint.h \
+	$(CONTRIBDIR)/qemu/include/qapi/qmp/qjson.h \
+	$(CONTRIBDIR)/qemu/include/qapi/qmp/qlist.h \
+	$(CONTRIBDIR)/qemu/include/qapi/qmp/qobject.h \
+	$(CONTRIBDIR)/qemu/include/qapi/qmp/qstring.h \
+	$(CONTRIBDIR)/qemu/include/qapi/qmp/types.h \
+	$(CONTRIBDIR)/qemu/include/qemu/aes.h \
+	$(CONTRIBDIR)/qemu/include/qemu/atomic.h \
+	$(CONTRIBDIR)/qemu/include/qemu/bitmap.h \
+	$(CONTRIBDIR)/qemu/include/qemu/bitops.h \
+	$(CONTRIBDIR)/qemu/include/qemu/bswap.h \
+	$(CONTRIBDIR)/qemu/include/qemu/compiler.h \
+	$(CONTRIBDIR)/qemu/include/qemu/error-report.h \
+	$(CONTRIBDIR)/qemu/include/qemu/event_notifier.h \
+	$(CONTRIBDIR)/qemu/include/qemu/hbitmap.h \
+	$(CONTRIBDIR)/qemu/include/qemu/host-utils.h \
+	$(CONTRIBDIR)/qemu/include/qemu/iov.h \
+	$(CONTRIBDIR)/qemu/include/qemu/main-loop.h \
+	$(CONTRIBDIR)/qemu/include/qemu/module.h \
+	$(CONTRIBDIR)/qemu/include/qemu/notify.h \
+	$(CONTRIBDIR)/qemu/include/qemu/option.h \
+	$(CONTRIBDIR)/qemu/include/qemu/option_int.h \
+	$(CONTRIBDIR)/qemu/include/qemu/osdep.h \
+	$(CONTRIBDIR)/qemu/include/qemu/queue.h \
+	$(CONTRIBDIR)/qemu/include/qemu/sockets.h \
+	$(CONTRIBDIR)/qemu/include/qemu/thread-posix.h \
+	$(CONTRIBDIR)/qemu/include/qemu/thread.h \
+	$(CONTRIBDIR)/qemu/include/qemu/timer.h \
+	$(CONTRIBDIR)/qemu/include/qemu/typedefs.h \
+	$(CONTRIBDIR)/qemu/include/sysemu/sysemu.h \
+	$(CONTRIBDIR)/qemu/include/sysemu/os-posix.h \
+	$(CONTRIBDIR)/qemu/block/qcow2.h \
+	$(CONTRIBDIR)/qemu/block/qed.h
+
+noinst_HEADERS = \
+	$(noinst_HEADERS_qemu) \
+	qemu-block.h \
+	qemu-block-memory-types.h \
+	qb-coroutines.h
+
+AM_CPPFLAGS = $(GF_CPPFLAGS) -I$(top_srcdir)/libglusterfs/src \
+            -I$(CONTRIBDIR)/qemu \
+            -I$(CONTRIBDIR)/qemu/include \
+            -DGLUSTER_XLATOR
+
+AM_CFLAGS = -fno-strict-aliasing -Wall $(GF_CFLAGS) $(GLIB_CFLAGS)
+
+CLEANFILES =
+
+endif
diff --git a/xlators/features/qemu-block/src/bdrv-xlator.c b/xlators/features/qemu-block/src/bdrv-xlator.c
new file mode 100644
index 000000000..106c59775
--- /dev/null
+++ b/xlators/features/qemu-block/src/bdrv-xlator.c
@@ -0,0 +1,397 @@
+/*
+  Copyright (c) 2013 Red Hat, Inc. <http://www.redhat.com>
+  This file is part of GlusterFS.
+
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
+*/
+
+
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+
+#include "inode.h"
+#include "syncop.h"
+#include "qemu-block.h"
+#include "block/block_int.h"
+
+typedef struct BDRVGlusterState {
+	inode_t *inode;
+} BDRVGlusterState;
+
+static QemuOptsList runtime_opts = {
+	.name = "gluster",
+	.head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
+	.desc = {
+		{
+			.name = "filename",
+			.type = QEMU_OPT_STRING,
+			.help = "GFID of file",
+		},
+		{ /* end of list */ }
+	},
+};
+
+inode_t *
+qb_inode_from_filename (const char *filename)
+{
+	const char *iptr = NULL;
+	inode_t *inode = NULL;
+
+	iptr = filename + 17;
+	sscanf (iptr, "%p", &inode);
+
+	return inode;
+}
+
+
+int
+qb_inode_to_filename (inode_t *inode, char *filename, int size)
+{
+	return snprintf (filename, size, "gluster://inodep:%p", inode);
+}
+
+
+static fd_t *
+fd_from_bs (BlockDriverState *bs)
+{
+	BDRVGlusterState *s = bs->opaque;
+
+	return fd_anonymous (s->inode);
+}
+
+
+static int
+qemu_gluster_open (BlockDriverState *bs, QDict *options, int bdrv_flags)
+{
+	inode_t *inode = NULL;
+	BDRVGlusterState *s = bs->opaque;
+	QemuOpts *opts = NULL;
+	Error *local_err = NULL;
+	const char *filename = NULL;
+	char gfid_str[128];
+	int ret;
+	qb_conf_t *conf = THIS->private;
+
+	opts = qemu_opts_create_nofail(&runtime_opts);
+	qemu_opts_absorb_qdict(opts, options, &local_err);
+	if (error_is_set(&local_err)) {
+		qerror_report_err(local_err);
+		error_free(local_err);
+		return -EINVAL;
+	}
+
+	filename = qemu_opt_get(opts, "filename");
+
+	/*
+	 * gfid:<gfid> format means we're opening a backing image.
+	 */
+	ret = sscanf(filename, "gluster://gfid:%s", gfid_str);
+	if (ret) {
+		loc_t loc = {0,};
+		struct iatt buf = {0,};
+		uuid_t gfid;
+
+		uuid_parse(gfid_str, gfid);
+
+		loc.inode = inode_find(conf->root_inode->table, gfid);
+		if (!loc.inode) {
+			loc.inode = inode_new(conf->root_inode->table);
+			uuid_copy(loc.inode->gfid, gfid);
+		}
+
+		uuid_copy(loc.gfid, loc.inode->gfid);
+		ret = syncop_lookup(FIRST_CHILD(THIS), &loc, NULL, &buf, NULL,
+				    NULL);
+		if (ret) {
+			loc_wipe(&loc);
+			return -errno;
+		}
+
+		s->inode = inode_ref(loc.inode);
+		loc_wipe(&loc);
+	} else {
+		inode = qb_inode_from_filename (filename);
+		if (!inode)
+			return -EINVAL;
+
+		s->inode = inode_ref(inode);
+	}
+
+	return 0;
+}
+
+
+static int
+qemu_gluster_create (const char *filename, QEMUOptionParameter *options)
+{
+	uint64_t total_size = 0;
+	inode_t *inode = NULL;
+	fd_t *fd = NULL;
+	struct iatt stat = {0, };
+	int ret = 0;
+
+	inode = qb_inode_from_filename (filename);
+	if (!inode)
+		return -EINVAL;
+
+	while (options && options->name) {
+		if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
+			total_size = options->value.n / BDRV_SECTOR_SIZE;
+		}
+		options++;
+	}
+
+	fd = fd_anonymous (inode);
+	if (!fd)
+		return -ENOMEM;
+
+	ret = syncop_fstat (FIRST_CHILD(THIS), fd, &stat);
+	if (ret) {
+		fd_unref (fd);
+		return -errno;
+	}
+
+	if (stat.ia_size) {
+		/* format ONLY if the filesize is 0 bytes */
+		fd_unref (fd);
+		return -EFBIG;
+	}
+
+	if (total_size) {
+		ret = syncop_ftruncate (FIRST_CHILD(THIS), fd, total_size);
+		if (ret) {
+			fd_unref (fd);
+			return -errno;
+		}
+	}
+
+	fd_unref (fd);
+	return 0;
+}
+
+
+static int
+qemu_gluster_co_readv (BlockDriverState *bs, int64_t sector_num, int nb_sectors,
+		       QEMUIOVector *qiov)
+{
+	fd_t *fd = NULL;
+	off_t offset = 0;
+	size_t size = 0;
+	struct iovec *iov = NULL;
+	int count = 0;
+	struct iobref *iobref = NULL;
+	int ret = 0;
+
+	fd = fd_from_bs (bs);
+	if (!fd)
+		return -EIO;
+
+	offset = sector_num * BDRV_SECTOR_SIZE;
+	size = nb_sectors * BDRV_SECTOR_SIZE;
+
+	ret = syncop_readv (FIRST_CHILD(THIS), fd, size, offset, 0,
+			    &iov, &count, &iobref);
+	if (ret < 0) {
+		ret = -errno;
+		goto out;
+	}
+
+	iov_copy (qiov->iov, qiov->niov, iov, count); /* *choke!* */
+
+out:
+	GF_FREE (iov);
+	if (iobref)
+		iobref_unref (iobref);
+	fd_unref (fd);
+	return ret;
+}
+
+
+static int
+qemu_gluster_co_writev (BlockDriverState *bs, int64_t sector_num, int nb_sectors,
+			QEMUIOVector *qiov)
+{
+	fd_t *fd = NULL;
+	off_t offset = 0;
+	size_t size = 0;
+	struct iobref *iobref = NULL;
+	struct iobuf *iobuf = NULL;
+	struct iovec iov = {0, };
+	int ret = -ENOMEM;
+
+	fd = fd_from_bs (bs);
+	if (!fd)
+		return -EIO;
+
+	offset = sector_num * BDRV_SECTOR_SIZE;
+	size = nb_sectors * BDRV_SECTOR_SIZE;
+
+	iobuf = iobuf_get2 (THIS->ctx->iobuf_pool, size);
+	if (!iobuf)
+		goto out;
+
+	iobref = iobref_new ();
+	if (!iobref) {
+		iobuf_unref (iobuf);
+		goto out;
+	}
+
+	iobref_add (iobref, iobuf);
+
+	iov_unload (iobuf_ptr (iobuf), qiov->iov, qiov->niov); /* *choke!* */
+
+	iov.iov_base = iobuf_ptr (iobuf);
+	iov.iov_len = size;
+
+	ret = syncop_writev (FIRST_CHILD(THIS), fd, &iov, 1, offset, iobref, 0);
+	if (ret < 0)
+		ret = -errno;
+
+out:
+	if (iobuf)
+		iobuf_unref (iobuf);
+	if (iobref)
+		iobref_unref (iobref);
+	fd_unref (fd);
+	return ret;
+}
+
+
+static int
+qemu_gluster_co_flush (BlockDriverState *bs)
+{
+	fd_t *fd = NULL;
+	int ret = 0;
+
+	fd = fd_from_bs (bs);
+
+	ret = syncop_flush (FIRST_CHILD(THIS), fd);
+
+	fd_unref (fd);
+
+	return ret;
+}
+
+
+static int
+qemu_gluster_co_fsync (BlockDriverState *bs)
+{
+	fd_t *fd = NULL;
+	int ret = 0;
+
+	fd = fd_from_bs (bs);
+
+	ret = syncop_fsync (FIRST_CHILD(THIS), fd, 0);
+
+	fd_unref (fd);
+
+	return ret;
+}
+
+
+static int
+qemu_gluster_truncate (BlockDriverState *bs, int64_t offset)
+{
+	fd_t *fd = NULL;
+	int ret = 0;
+
+	fd = fd_from_bs (bs);
+
+	ret = syncop_ftruncate (FIRST_CHILD(THIS), fd, offset);
+
+	fd_unref (fd);
+
+	if (ret < 0)
+		return ret;
+
+	return ret;
+}
+
+
+static int64_t
+qemu_gluster_getlength (BlockDriverState *bs)
+{
+	fd_t *fd = NULL;
+	int ret = 0;
+	struct iatt iatt = {0, };
+
+	fd = fd_from_bs (bs);
+
+	ret = syncop_fstat (FIRST_CHILD(THIS), fd, &iatt);
+	if (ret < 0)
+		return -1;
+
+	return iatt.ia_size;
+}
+
+
+static int64_t
+qemu_gluster_allocated_file_size (BlockDriverState *bs)
+{
+	fd_t *fd = NULL;
+	int ret = 0;
+	struct iatt iatt = {0, };
+
+	fd = fd_from_bs (bs);
+
+	ret = syncop_fstat (FIRST_CHILD(THIS), fd, &iatt);
+	if (ret < 0)
+		return -1;
+
+	return iatt.ia_blocks * 512;
+}
+
+
+static void
+qemu_gluster_close (BlockDriverState *bs)
+{
+	BDRVGlusterState *s = NULL;
+
+	s = bs->opaque;
+
+	inode_unref (s->inode);
+
+	return;
+}
+
+
+static QEMUOptionParameter qemu_gluster_create_options[] = {
+	{
+		.name = BLOCK_OPT_SIZE,
+		.type = OPT_SIZE,
+		.help = "Virtual disk size"
+	},
+	{ NULL }
+};
+
+
+static BlockDriver bdrv_gluster = {
+	.format_name                  = "gluster",
+	.protocol_name                = "gluster",
+	.instance_size                = sizeof(BDRVGlusterState),
+	.bdrv_file_open               = qemu_gluster_open,
+	.bdrv_close                   = qemu_gluster_close,
+	.bdrv_create                  = qemu_gluster_create,
+	.bdrv_getlength               = qemu_gluster_getlength,
+	.bdrv_get_allocated_file_size = qemu_gluster_allocated_file_size,
+	.bdrv_co_readv                = qemu_gluster_co_readv,
+	.bdrv_co_writev               = qemu_gluster_co_writev,
+	.bdrv_co_flush_to_os          = qemu_gluster_co_flush,
+	.bdrv_co_flush_to_disk        = qemu_gluster_co_fsync,
+	.bdrv_truncate                = qemu_gluster_truncate,
+	.create_options               = qemu_gluster_create_options,
+};
+
+
+static void bdrv_gluster_init(void)
+{
+	bdrv_register(&bdrv_gluster);
+}
+
+
+block_init(bdrv_gluster_init);
diff --git a/xlators/features/qemu-block/src/bh-syncop.c b/xlators/features/qemu-block/src/bh-syncop.c
new file mode 100644
index 000000000..e8686f6d4
--- /dev/null
+++ b/xlators/features/qemu-block/src/bh-syncop.c
@@ -0,0 +1,48 @@
+/*
+  Copyright (c) 2013 Red Hat, Inc. <http://www.redhat.com>
+  This file is part of GlusterFS.
+
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
+*/
+
+
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+
+#include "glusterfs.h"
+#include "logging.h"
+#include "dict.h"
+#include "xlator.h"
+#include "syncop.h"
+#include "qemu-block-memory-types.h"
+
+#include "block/aio.h"
+
+void
+qemu_bh_schedule (QEMUBH *bh)
+{
+	return;
+}
+
+void
+qemu_bh_cancel (QEMUBH *bh)
+{
+	return;
+}
+
+void
+qemu_bh_delete (QEMUBH *bh)
+{
+
+}
+
+QEMUBH *
+qemu_bh_new (QEMUBHFunc *cb, void *opaque)
+{
+	return NULL;
+}
diff --git a/xlators/features/qemu-block/src/clock-timer.c b/xlators/features/qemu-block/src/clock-timer.c
new file mode 100644
index 000000000..fcbec6ad1
--- /dev/null
+++ b/xlators/features/qemu-block/src/clock-timer.c
@@ -0,0 +1,60 @@
+/*
+  Copyright (c) 2013 Red Hat, Inc. <http://www.redhat.com>
+  This file is part of GlusterFS.
+
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
+*/
+
+
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+
+#include "glusterfs.h"
+#include "logging.h"
+#include "dict.h"
+#include "xlator.h"
+#include "syncop.h"
+#include "qemu-block-memory-types.h"
+
+#include "qemu/timer.h"
+
+QEMUClock *vm_clock;
+int use_rt_clock = 0;
+
+QEMUTimer *qemu_new_timer (QEMUClock *clock, int scale,
+			   QEMUTimerCB *cb, void *opaque)
+{
+	return NULL;
+}
+
+int64_t qemu_get_clock_ns (QEMUClock *clock)
+{
+	return 0;
+}
+
+void qemu_mod_timer (QEMUTimer *ts, int64_t expire_time)
+{
+	return;
+}
+
+void qemu_free_timer (QEMUTimer *ts)
+{
+
+}
+
+void qemu_del_timer (QEMUTimer *ts)
+{
+
+}
+
+bool qemu_aio_wait()
+{
+	synctask_wake (synctask_get());
+	synctask_yield (synctask_get());
+	return 0;
+}
diff --git a/xlators/features/qemu-block/src/coroutine-synctask.c b/xlators/features/qemu-block/src/coroutine-synctask.c
new file mode 100644
index 000000000..e43988a95
--- /dev/null
+++ b/xlators/features/qemu-block/src/coroutine-synctask.c
@@ -0,0 +1,116 @@
+/*
+  Copyright (c) 2013 Red Hat, Inc. <http://www.redhat.com>
+  This file is part of GlusterFS.
+
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
+*/
+
+
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+
+#include "glusterfs.h"
+#include "logging.h"
+#include "dict.h"
+#include "xlator.h"
+#include "syncop.h"
+#include "qemu-block-memory-types.h"
+
+#include "qemu-block.h"
+
+/*
+ * This code serves as the bridge from the main glusterfs context to the qemu
+ * coroutine context via synctask. We create a single threaded syncenv with a
+ * single synctask responsible for processing a queue of coroutines. The qemu
+ * code invoked from within the synctask function handlers uses the ucontext
+ * coroutine implementation and scheduling logic internal to qemu. This
+ * effectively donates a thread of execution to qemu and its internal coroutine
+ * management.
+ *
+ * NOTE: The existence of concurrent synctasks has proven quite racy with regard
+ * to qemu coroutine management, particularly related to the lifecycle
+ * differences with top-level synctasks and internally created coroutines and
+ * interactions with qemu-internal queues (and locks, in turn). We explicitly
+ * disallow this scenario, via the queue, until it is more well supported.
+ */
+
+static struct {
+	struct list_head	queue;
+	gf_lock_t		lock;
+	struct synctask		*task;
+} qb_co;
+
+static void
+init_qbco()
+{
+	INIT_LIST_HEAD(&qb_co.queue);
+	LOCK_INIT(&qb_co.lock);
+}
+
+static int
+synctask_nop_cbk (int ret, call_frame_t *frame, void *opaque)
+{
+	return 0;
+}
+
+static int
+qb_synctask_wrap (void *opaque)
+{
+	qb_local_t *qb_local, *tmp;
+
+	LOCK(&qb_co.lock);
+
+	while (!list_empty(&qb_co.queue)) {
+		list_for_each_entry_safe(qb_local, tmp, &qb_co.queue, list) {
+			list_del_init(&qb_local->list);
+			break;
+		}
+
+		UNLOCK(&qb_co.lock);
+
+		qb_local->synctask_fn(qb_local);
+		/* qb_local is now unwound and gone! */
+
+		LOCK(&qb_co.lock);
+	}
+
+	qb_co.task = NULL;
+
+	UNLOCK(&qb_co.lock);
+
+	return 0;
+}
+
+int
+qb_coroutine (call_frame_t *frame, synctask_fn_t fn)
+{
+	qb_local_t *qb_local = NULL;
+	qb_conf_t *qb_conf = NULL;
+	static int init = 0;
+
+	qb_local = frame->local;
+	qb_local->synctask_fn = fn;
+	qb_conf = frame->this->private;
+
+	if (!init) {
+		init = 1;
+		init_qbco();
+	}
+
+	LOCK(&qb_co.lock);
+
+	if (!qb_co.task)
+		qb_co.task = synctask_create(qb_conf->env, qb_synctask_wrap,
+					     synctask_nop_cbk, frame, NULL);
+
+	list_add_tail(&qb_local->list, &qb_co.queue);
+
+	UNLOCK(&qb_co.lock);
+
+	return 0;
+}
diff --git a/xlators/features/qemu-block/src/monitor-logging.c b/xlators/features/qemu-block/src/monitor-logging.c
new file mode 100644
index 000000000..d37c37f0f
--- /dev/null
+++ b/xlators/features/qemu-block/src/monitor-logging.c
@@ -0,0 +1,50 @@
+/*
+  Copyright (c) 2013 Red Hat, Inc. <http://www.redhat.com>
+  This file is part of GlusterFS.
+
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
+*/
+
+
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+
+#include "glusterfs.h"
+#include "logging.h"
+#include "dict.h"
+#include "xlator.h"
+#include "qemu-block-memory-types.h"
+
+#include "block/block_int.h"
+
+Monitor *cur_mon;
+
+int
+monitor_cur_is_qmp()
+{
+	/* No QMP support here */
+	return 0;
+}
+
+void
+monitor_set_error (Monitor *mon, QError *qerror)
+{
+	/* NOP here */
+	return;
+}
+
+
+void
+monitor_vprintf(Monitor *mon, const char *fmt, va_list ap)
+{
+	char buf[4096];
+
+	vsnprintf(buf, sizeof(buf), fmt, ap);
+
+	gf_log (THIS->name, GF_LOG_ERROR, "%s", buf);
+}
diff --git a/xlators/features/qemu-block/src/qb-coroutines.c b/xlators/features/qemu-block/src/qb-coroutines.c
new file mode 100644
index 000000000..7c52adb21
--- /dev/null
+++ b/xlators/features/qemu-block/src/qb-coroutines.c
@@ -0,0 +1,662 @@
+/*
+  Copyright (c) 2013 Red Hat, Inc. <http://www.redhat.com>
+  This file is part of GlusterFS.
+
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
+*/
+
+
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+
+#include "glusterfs.h"
+#include "logging.h"
+#include "dict.h"
+#include "xlator.h"
+#include "inode.h"
+#include "call-stub.h"
+#include "defaults.h"
+#include "qemu-block-memory-types.h"
+#include "qemu-block.h"
+#include "qb-coroutines.h"
+
+
+int
+qb_format_and_resume (void *opaque)
+{
+	qb_local_t *local = NULL;
+	call_frame_t *frame = NULL;
+	call_stub_t *stub = NULL;
+	inode_t *inode = NULL;
+	char filename[64];
+	char base_filename[128];
+	int use_base = 0;
+	qb_inode_t *qb_inode = NULL;
+	Error *local_err = NULL;
+	fd_t *fd = NULL;
+	dict_t *xattr = NULL;
+	qb_conf_t *qb_conf = NULL;
+	int ret = -1;
+
+	local = opaque;
+	frame = local->frame;
+	stub = local->stub;
+	inode = local->inode;
+	qb_conf = frame->this->private;
+
+	qb_inode_to_filename (inode, filename, 64);
+
+	qb_inode = qb_inode_ctx_get (frame->this, inode);
+
+	/*
+	 * See if the caller specified a backing image.
+	 */
+	if (!uuid_is_null(qb_inode->backing_gfid) || qb_inode->backing_fname) {
+		loc_t loc = {0,};
+		char gfid_str[64];
+		struct iatt buf;
+
+		if (!uuid_is_null(qb_inode->backing_gfid)) {
+			loc.inode = inode_find(qb_conf->root_inode->table,
+					qb_inode->backing_gfid);
+			if (!loc.inode) {
+				loc.inode = inode_new(qb_conf->root_inode->table);
+				uuid_copy(loc.inode->gfid,
+					qb_inode->backing_gfid);
+			}
+			uuid_copy(loc.gfid, loc.inode->gfid);
+		} else if (qb_inode->backing_fname) {
+			loc.inode = inode_new(qb_conf->root_inode->table);
+			loc.name = qb_inode->backing_fname;
+			loc.parent = inode_parent(inode, NULL, NULL);
+			loc_path(&loc, loc.name);
+		}
+
+		/*
+		 * Lookup the backing image. Verify existence and/or get the
+		 * gfid if we don't already have it.
+		 */
+		ret = syncop_lookup(FIRST_CHILD(frame->this), &loc, NULL, &buf,
+				    NULL, NULL);
+		GF_FREE(qb_inode->backing_fname);
+		if (ret) {
+			loc_wipe(&loc);
+			ret = errno;
+			goto err;
+		}
+
+		uuid_copy(qb_inode->backing_gfid, buf.ia_gfid);
+		loc_wipe(&loc);
+
+		/*
+		 * We pass the filename of the backing image into the qemu block
+		 * subsystem as the associated gfid. This is embedded into the
+		 * clone image and passed along to the gluster bdrv backend when
+		 * the block subsystem needs to operate on the backing image on
+		 * behalf of the clone.
+		 */
+		uuid_unparse(qb_inode->backing_gfid, gfid_str);
+		snprintf(base_filename, sizeof(base_filename),
+			 "gluster://gfid:%s", gfid_str);
+		use_base = 1;
+	}
+
+	bdrv_img_create (filename, qb_inode->fmt,
+			 use_base ? base_filename : NULL, 0, 0, qb_inode->size,
+			 0, &local_err, true);
+
+	if (error_is_set (&local_err)) {
+		gf_log (frame->this->name, GF_LOG_ERROR, "%s",
+			error_get_pretty (local_err));
+		error_free (local_err);
+		QB_STUB_UNWIND (stub, -1, EIO);
+		return 0;
+	}
+
+	fd = fd_anonymous (inode);
+	if (!fd) {
+		gf_log (frame->this->name, GF_LOG_ERROR,
+			"could not create anonymous fd for %s",
+			uuid_utoa (inode->gfid));
+		QB_STUB_UNWIND (stub, -1, ENOMEM);
+		return 0;
+	}
+
+	xattr = dict_new ();
+	if (!xattr) {
+		gf_log (frame->this->name, GF_LOG_ERROR,
+			"could not allocate xattr dict for %s",
+			uuid_utoa (inode->gfid));
+		QB_STUB_UNWIND (stub, -1, ENOMEM);
+		fd_unref (fd);
+		return 0;
+	}
+
+	ret = dict_set_str (xattr, qb_conf->qb_xattr_key, local->fmt);
+	if (ret) {
+		gf_log (frame->this->name, GF_LOG_ERROR,
+			"could not dict_set for %s",
+			uuid_utoa (inode->gfid));
+		QB_STUB_UNWIND (stub, -1, ENOMEM);
+		fd_unref (fd);
+		dict_unref (xattr);
+		return 0;
+	}
+
+	ret = syncop_fsetxattr (FIRST_CHILD(THIS), fd, xattr, 0);
+	if (ret) {
+		ret = errno;
+		gf_log (frame->this->name, GF_LOG_ERROR,
+			"failed to setxattr for %s",
+			uuid_utoa (inode->gfid));
+		QB_STUB_UNWIND (stub, -1, ret);
+		fd_unref (fd);
+		dict_unref (xattr);
+		return 0;
+	}
+
+	fd_unref (fd);
+	dict_unref (xattr);
+
+	QB_STUB_UNWIND (stub, 0, 0);
+
+	return 0;
+
+err:
+	QB_STUB_UNWIND(stub, -1, ret);
+	return 0;
+}
+
+
+static BlockDriverState *
+qb_bs_create (inode_t *inode, const char *fmt)
+{
+	char filename[64];
+	BlockDriverState *bs = NULL;
+	BlockDriver *drv = NULL;
+	int op_errno = 0;
+	int ret = 0;
+
+	bs = bdrv_new (uuid_utoa (inode->gfid));
+	if (!bs) {
+		op_errno = ENOMEM;
+		gf_log (THIS->name, GF_LOG_ERROR,
+			"could not allocate @bdrv for gfid:%s",
+			uuid_utoa (inode->gfid));
+		goto err;
+	}
+
+	drv = bdrv_find_format (fmt);
+	if (!drv) {
+		op_errno = EINVAL;
+		gf_log (THIS->name, GF_LOG_ERROR,
+			"Unknown file format: %s for gfid:%s",
+			fmt, uuid_utoa (inode->gfid));
+		goto err;
+	}
+
+	qb_inode_to_filename (inode, filename, 64);
+
+	ret = bdrv_open (bs, filename, NULL, BDRV_O_RDWR, drv);
+	if (ret < 0) {
+		op_errno = -ret;
+		gf_log (THIS->name, GF_LOG_ERROR,
+			"Unable to bdrv_open() gfid:%s (%s)",
+			uuid_utoa (inode->gfid), strerror (op_errno));
+		goto err;
+	}
+
+	return bs;
+err:
+	errno = op_errno;
+	return NULL;
+}
+
+
+int
+qb_co_open (void *opaque)
+{
+	qb_local_t *local = NULL;
+	call_frame_t *frame = NULL;
+	call_stub_t *stub = NULL;
+	inode_t *inode = NULL;
+	qb_inode_t *qb_inode = NULL;
+
+	local = opaque;
+	frame = local->frame;
+	stub = local->stub;
+	inode = local->inode;
+
+	qb_inode = qb_inode_ctx_get (frame->this, inode);
+	if (!qb_inode->bs) {
+		/* FIXME: we need locks around this when
+		   enabling multithreaded syncop/coroutine
+		   for qemu-block
+		*/
+
+		qb_inode->bs = qb_bs_create (inode, qb_inode->fmt);
+		if (!qb_inode->bs) {
+			QB_STUB_UNWIND (stub, -1, errno);
+			return 0;
+		}
+	}
+	qb_inode->refcnt++;
+
+	QB_STUB_RESUME (stub);
+
+	return 0;
+}
+
+
+int
+qb_co_writev (void *opaque)
+{
+	qb_local_t *local = NULL;
+	call_frame_t *frame = NULL;
+	call_stub_t *stub = NULL;
+	inode_t *inode = NULL;
+	qb_inode_t *qb_inode = NULL;
+	QEMUIOVector qiov = {0, };
+	int ret = 0;
+
+	local = opaque;
+	frame = local->frame;
+	stub = local->stub;
+	inode = local->inode;
+
+	qb_inode = qb_inode_ctx_get (frame->this, inode);
+	if (!qb_inode->bs) {
+		/* FIXME: we need locks around this when
+		   enabling multithreaded syncop/coroutine
+		   for qemu-block
+		*/
+
+		qb_inode->bs = qb_bs_create (inode, qb_inode->fmt);
+		if (!qb_inode->bs) {
+			QB_STUB_UNWIND (stub, -1, errno);
+			return 0;
+		}
+	}
+
+	qemu_iovec_init_external (&qiov, stub->args.vector, stub->args.count);
+
+	ret = bdrv_pwritev (qb_inode->bs, stub->args.offset, &qiov);
+
+	if (ret < 0) {
+		QB_STUB_UNWIND (stub, -1, -ret);
+	} else {
+		QB_STUB_UNWIND (stub, ret, 0);
+	}
+
+	return 0;
+}
+
+
+int
+qb_co_readv (void *opaque)
+{
+	qb_local_t *local = NULL;
+	call_frame_t *frame = NULL;
+	call_stub_t *stub = NULL;
+	inode_t *inode = NULL;
+	qb_inode_t *qb_inode = NULL;
+	struct iobuf *iobuf = NULL;
+	struct iobref *iobref = NULL;
+	struct iovec iov = {0, };
+	int ret = 0;
+
+	local = opaque;
+	frame = local->frame;
+	stub = local->stub;
+	inode = local->inode;
+
+	qb_inode = qb_inode_ctx_get (frame->this, inode);
+	if (!qb_inode->bs) {
+		/* FIXME: we need locks around this when
+		   enabling multithreaded syncop/coroutine
+		   for qemu-block
+		*/
+
+		qb_inode->bs = qb_bs_create (inode, qb_inode->fmt);
+		if (!qb_inode->bs) {
+			QB_STUB_UNWIND (stub, -1, errno);
+			return 0;
+		}
+	}
+
+	if (stub->args.offset >= qb_inode->size) {
+		QB_STUB_UNWIND (stub, 0, 0);
+		return 0;
+	}
+
+	iobuf = iobuf_get2 (frame->this->ctx->iobuf_pool, stub->args.size);
+	if (!iobuf) {
+		QB_STUB_UNWIND (stub, -1, ENOMEM);
+		return 0;
+	}
+
+	iobref = iobref_new ();
+	if (!iobref) {
+		QB_STUB_UNWIND (stub, -1, ENOMEM);
+		iobuf_unref (iobuf);
+		return 0;
+	}
+
+	if (iobref_add (iobref, iobuf) < 0) {
+		iobuf_unref (iobuf);
+		iobref_unref (iobref);
+		QB_STUB_UNWIND (stub, -1, ENOMEM);
+		return 0;
+	}
+
+	ret = bdrv_pread (qb_inode->bs, stub->args.offset, iobuf_ptr (iobuf),
+			  stub->args.size);
+
+	if (ret < 0) {
+		QB_STUB_UNWIND (stub, -1, -ret);
+		iobref_unref (iobref);
+		return 0;
+	}
+
+	iov.iov_base = iobuf_ptr (iobuf);
+	iov.iov_len = ret;
+
+	stub->args_cbk.vector = iov_dup (&iov, 1);
+	stub->args_cbk.count = 1;
+	stub->args_cbk.iobref = iobref;
+
+	QB_STUB_UNWIND (stub, ret, 0);
+
+	return 0;
+}
+
+
+int
+qb_co_fsync (void *opaque)
+{
+	qb_local_t *local = NULL;
+	call_frame_t *frame = NULL;
+	call_stub_t *stub = NULL;
+	inode_t *inode = NULL;
+	qb_inode_t *qb_inode = NULL;
+	int ret = 0;
+
+	local = opaque;
+	frame = local->frame;
+	stub = local->stub;
+	inode = local->inode;
+
+	qb_inode = qb_inode_ctx_get (frame->this, inode);
+	if (!qb_inode->bs) {
+		/* FIXME: we need locks around this when
+		   enabling multithreaded syncop/coroutine
+		   for qemu-block
+		*/
+
+		qb_inode->bs = qb_bs_create (inode, qb_inode->fmt);
+		if (!qb_inode->bs) {
+			QB_STUB_UNWIND (stub, -1, errno);
+			return 0;
+		}
+	}
+
+	ret = bdrv_flush (qb_inode->bs);
+
+	if (ret < 0) {
+		QB_STUB_UNWIND (stub, -1, -ret);
+	} else {
+		QB_STUB_UNWIND (stub, ret, 0);
+	}
+
+	return 0;
+}
+
+
+static void
+qb_update_size_xattr (xlator_t *this, fd_t *fd, const char *fmt, off_t offset)
+{
+	char val[QB_XATTR_VAL_MAX];
+	qb_conf_t *qb_conf = NULL;
+	dict_t *xattr = NULL;
+
+	qb_conf = this->private;
+
+	snprintf (val, QB_XATTR_VAL_MAX, "%s:%llu",
+		  fmt, (long long unsigned) offset);
+
+	xattr = dict_new ();
+	if (!xattr)
+		return;
+
+	if (dict_set_str (xattr, qb_conf->qb_xattr_key, val) != 0) {
+		dict_unref (xattr);
+		return;
+	}
+
+	syncop_fsetxattr (FIRST_CHILD(this), fd, xattr, 0);
+	dict_unref (xattr);
+}
+
+
+int
+qb_co_truncate (void *opaque)
+{
+	qb_local_t *local = NULL;
+	call_frame_t *frame = NULL;
+	call_stub_t *stub = NULL;
+	inode_t *inode = NULL;
+	qb_inode_t *qb_inode = NULL;
+	int ret = 0;
+	off_t offset = 0;
+	xlator_t *this = NULL;
+
+	this = THIS;
+
+	local = opaque;
+	frame = local->frame;
+	stub = local->stub;
+	inode = local->inode;
+
+	qb_inode = qb_inode_ctx_get (frame->this, inode);
+	if (!qb_inode->bs) {
+		/* FIXME: we need locks around this when
+		   enabling multithreaded syncop/coroutine
+		   for qemu-block
+		*/
+
+		qb_inode->bs = qb_bs_create (inode, qb_inode->fmt);
+		if (!qb_inode->bs) {
+			QB_STUB_UNWIND (stub, -1, errno);
+			return 0;
+		}
+	}
+
+	syncop_fstat (FIRST_CHILD(this), local->fd, &stub->args_cbk.prestat);
+	stub->args_cbk.prestat.ia_size = qb_inode->size;
+
+	ret = bdrv_truncate (qb_inode->bs, stub->args.offset);
+	if (ret < 0)
+		goto out;
+
+	offset = bdrv_getlength (qb_inode->bs);
+
+	qb_inode->size = offset;
+
+	syncop_fstat (FIRST_CHILD(this), local->fd, &stub->args_cbk.poststat);
+	stub->args_cbk.poststat.ia_size = qb_inode->size;
+
+	qb_update_size_xattr (this, local->fd, qb_inode->fmt, qb_inode->size);
+
+out:
+	if (ret < 0) {
+		QB_STUB_UNWIND (stub, -1, -ret);
+	} else {
+		QB_STUB_UNWIND (stub, ret, 0);
+	}
+
+	return 0;
+}
+
+
+int
+qb_co_close (void *opaque)
+{
+	qb_local_t *local = NULL;
+	call_frame_t *frame = NULL;
+	inode_t *inode = NULL;
+	qb_inode_t *qb_inode = NULL;
+	BlockDriverState *bs = NULL;
+
+	local = opaque;
+	inode = local->inode;
+
+	qb_inode = qb_inode_ctx_get (THIS, inode);
+
+	if (!--qb_inode->refcnt) {
+		bs = qb_inode->bs;
+		qb_inode->bs = NULL;
+		bdrv_delete (bs);
+	}
+
+	frame = local->frame;
+	frame->local = NULL;
+	qb_local_free (THIS, local);
+	STACK_DESTROY (frame->root);
+
+	return 0;
+}
+
+
+int
+qb_snapshot_create (void *opaque)
+{
+	qb_local_t *local = NULL;
+	call_frame_t *frame = NULL;
+	call_stub_t *stub = NULL;
+	inode_t *inode = NULL;
+	qb_inode_t *qb_inode = NULL;
+	QEMUSnapshotInfo sn;
+	struct timeval tv = {0, };
+	int ret = 0;
+
+	local = opaque;
+	frame = local->frame;
+	stub = local->stub;
+	inode = local->inode;
+
+	qb_inode = qb_inode_ctx_get (frame->this, inode);
+	if (!qb_inode->bs) {
+		/* FIXME: we need locks around this when
+		   enabling multithreaded syncop/coroutine
+		   for qemu-block
+		*/
+
+		qb_inode->bs = qb_bs_create (inode, qb_inode->fmt);
+		if (!qb_inode->bs) {
+			QB_STUB_UNWIND (stub, -1, errno);
+			return 0;
+		}
+	}
+
+	memset (&sn, 0, sizeof (sn));
+        pstrcpy (sn.name, sizeof(sn.name), local->name);
+        gettimeofday (&tv, NULL);
+        sn.date_sec = tv.tv_sec;
+        sn.date_nsec = tv.tv_usec * 1000;
+
+        ret = bdrv_snapshot_create (qb_inode->bs, &sn);
+	if (ret < 0) {
+		QB_STUB_UNWIND (stub, -1, -ret);
+	} else {
+		QB_STUB_UNWIND (stub, ret, 0);
+	}
+
+	return 0;
+}
+
+
+int
+qb_snapshot_delete (void *opaque)
+{
+	qb_local_t *local = NULL;
+	call_frame_t *frame = NULL;
+	call_stub_t *stub = NULL;
+	inode_t *inode = NULL;
+	qb_inode_t *qb_inode = NULL;
+	int ret = 0;
+
+	local = opaque;
+	frame = local->frame;
+	stub = local->stub;
+	inode = local->inode;
+
+	qb_inode = qb_inode_ctx_get (frame->this, inode);
+	if (!qb_inode->bs) {
+		/* FIXME: we need locks around this when
+		   enabling multithreaded syncop/coroutine
+		   for qemu-block
+		*/
+
+		qb_inode->bs = qb_bs_create (inode, qb_inode->fmt);
+		if (!qb_inode->bs) {
+			QB_STUB_UNWIND (stub, -1, errno);
+			return 0;
+		}
+	}
+
+	ret = bdrv_snapshot_delete (qb_inode->bs, local->name);
+
+	if (ret < 0) {
+		QB_STUB_UNWIND (stub, -1, -ret);
+	} else {
+		QB_STUB_UNWIND (stub, ret, 0);
+	}
+
+	return 0;
+}
+
+
+int
+qb_snapshot_goto (void *opaque)
+{
+	qb_local_t *local = NULL;
+	call_frame_t *frame = NULL;
+	call_stub_t *stub = NULL;
+	inode_t *inode = NULL;
+	qb_inode_t *qb_inode = NULL;
+	int ret = 0;
+
+	local = opaque;
+	frame = local->frame;
+	stub = local->stub;
+	inode = local->inode;
+
+	qb_inode = qb_inode_ctx_get (frame->this, inode);
+	if (!qb_inode->bs) {
+		/* FIXME: we need locks around this when
+		   enabling multithreaded syncop/coroutine
+		   for qemu-block
+		*/
+
+		qb_inode->bs = qb_bs_create (inode, qb_inode->fmt);
+		if (!qb_inode->bs) {
+			QB_STUB_UNWIND (stub, -1, errno);
+			return 0;
+		}
+	}
+
+	ret = bdrv_snapshot_goto (qb_inode->bs, local->name);
+
+	if (ret < 0) {
+		QB_STUB_UNWIND (stub, -1, -ret);
+	} else {
+		QB_STUB_UNWIND (stub, ret, 0);
+	}
+
+	return 0;
+}
diff --git a/xlators/features/qemu-block/src/qb-coroutines.h b/xlators/features/qemu-block/src/qb-coroutines.h
new file mode 100644
index 000000000..583319f3b
--- /dev/null
+++ b/xlators/features/qemu-block/src/qb-coroutines.h
@@ -0,0 +1,30 @@
+/*
+  Copyright (c) 2013 Red Hat, Inc. <http://www.redhat.com>
+  This file is part of GlusterFS.
+
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
+*/
+
+#ifndef __QB_COROUTINES_H
+#define __QB_COROUTINES_H
+
+#include "syncop.h"
+#include "call-stub.h"
+#include "block/block_int.h"
+#include "monitor/monitor.h"
+
+int qb_format_and_resume (void *opaque);
+int qb_snapshot_create (void *opaque);
+int qb_snapshot_delete (void *opaque);
+int qb_snapshot_goto (void *opaque);
+int qb_co_open (void *opaque);
+int qb_co_close (void *opaque);
+int qb_co_writev (void *opaque);
+int qb_co_readv (void *opaque);
+int qb_co_fsync (void *opaque);
+int qb_co_truncate (void *opaque);
+
+#endif /* __QB_COROUTINES_H */
diff --git a/xlators/features/qemu-block/src/qemu-block-memory-types.h b/xlators/features/qemu-block/src/qemu-block-memory-types.h
new file mode 100644
index 000000000..267b3893f
--- /dev/null
+++ b/xlators/features/qemu-block/src/qemu-block-memory-types.h
@@ -0,0 +1,25 @@
+/*
+  Copyright (c) 2008-2012 Red Hat, Inc. <http://www.redhat.com>
+  This file is part of GlusterFS.
+
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
+*/
+
+
+#ifndef __QB_MEM_TYPES_H__
+#define __QB_MEM_TYPES_H__
+
+#include "mem-types.h"
+
+enum gf_qb_mem_types_ {
+        gf_qb_mt_qb_conf_t   = gf_common_mt_end + 1,
+        gf_qb_mt_qb_inode_t,
+        gf_qb_mt_qb_local_t,
+	gf_qb_mt_coroutinesynctask_t,
+        gf_qb_mt_end
+};
+#endif
+
diff --git a/xlators/features/qemu-block/src/qemu-block.c b/xlators/features/qemu-block/src/qemu-block.c
new file mode 100644
index 000000000..48bbf3140
--- /dev/null
+++ b/xlators/features/qemu-block/src/qemu-block.c
@@ -0,0 +1,1140 @@
+/*
+  Copyright (c) 2013 Red Hat, Inc. <http://www.redhat.com>
+  This file is part of GlusterFS.
+
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
+*/
+
+
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+
+#include "glusterfs.h"
+#include "logging.h"
+#include "dict.h"
+#include "xlator.h"
+#include "inode.h"
+#include "call-stub.h"
+#include "defaults.h"
+#include "qemu-block-memory-types.h"
+#include "qemu-block.h"
+#include "qb-coroutines.h"
+
+
+qb_inode_t *
+__qb_inode_ctx_get (xlator_t *this, inode_t *inode)
+{
+        uint64_t    value    = 0;
+        qb_inode_t *qb_inode = NULL;
+
+        __inode_ctx_get (inode, this, &value);
+        qb_inode = (qb_inode_t *)(unsigned long) value;
+
+        return qb_inode;
+}
+
+
+qb_inode_t *
+qb_inode_ctx_get (xlator_t *this, inode_t *inode)
+{
+        qb_inode_t *qb_inode = NULL;
+
+        LOCK (&inode->lock);
+        {
+                qb_inode = __qb_inode_ctx_get (this, inode);
+        }
+        UNLOCK (&inode->lock);
+
+        return qb_inode;
+}
+
+
+qb_inode_t *
+qb_inode_ctx_del (xlator_t *this, inode_t *inode)
+{
+        uint64_t    value    = 0;
+        qb_inode_t *qb_inode = NULL;
+
+        inode_ctx_del (inode, this, &value);
+        qb_inode = (qb_inode_t *)(unsigned long) value;
+
+        return qb_inode;
+}
+
+
+int
+qb_inode_cleanup (xlator_t *this, inode_t *inode, int warn)
+{
+	qb_inode_t *qb_inode = NULL;
+
+	qb_inode = qb_inode_ctx_del (this, inode);
+
+	if (!qb_inode)
+		return 0;
+
+	if (warn)
+		gf_log (this->name, GF_LOG_WARNING,
+			"inode %s no longer block formatted",
+			uuid_utoa (inode->gfid));
+
+	/* free (qb_inode->bs); */
+
+	GF_FREE (qb_inode);
+
+	return 0;
+}
+
+
+int
+qb_iatt_fixup (xlator_t *this, inode_t *inode, struct iatt *iatt)
+{
+	qb_inode_t *qb_inode = NULL;
+
+	qb_inode = qb_inode_ctx_get (this, inode);
+	if (!qb_inode)
+		return 0;
+
+	iatt->ia_size = qb_inode->size;
+
+	return 0;
+}
+
+
+int
+qb_format_extract (xlator_t *this, char *format, inode_t *inode)
+{
+	char       *s, *save;
+	uint64_t    size = 0;
+	char        fmt[QB_XATTR_VAL_MAX+1] = {0, };
+	qb_inode_t *qb_inode = NULL;
+	char *formatstr = NULL;
+	uuid_t gfid = {0,};
+	char gfid_str[64] = {0,};
+	int ret;
+
+	strncpy(fmt, format, QB_XATTR_VAL_MAX);
+
+	s = strtok_r(fmt, ":", &save);
+	if (!s)
+		goto invalid;
+	formatstr = gf_strdup(s);
+
+	s = strtok_r(NULL, ":", &save);
+	if (!s)
+		goto invalid;
+	if (gf_string2bytesize (s, &size))
+		goto invalid;
+	if (!size)
+		goto invalid;
+
+	s = strtok_r(NULL, "\0", &save);
+	if (s && !strncmp(s, "<gfid:", strlen("<gfid:"))) {
+		/*
+		 * Check for valid gfid backing image specifier.
+		 */
+		if (strlen(s) + 1 > sizeof(gfid_str))
+			goto invalid;
+		ret = sscanf(s, "<gfid:%[^>]s", gfid_str);
+		if (ret == 1) {
+			ret = uuid_parse(gfid_str, gfid);
+			if (ret < 0)
+				goto invalid;
+		}
+	}
+
+	qb_inode = qb_inode_ctx_get (this, inode);
+	if (!qb_inode)
+		qb_inode = GF_CALLOC (1, sizeof (*qb_inode),
+				      gf_qb_mt_qb_inode_t);
+	if (!qb_inode) {
+		GF_FREE(formatstr);
+		return ENOMEM;
+	}
+
+	strncpy(qb_inode->fmt, formatstr, QB_XATTR_VAL_MAX);
+	qb_inode->size = size;
+
+	/*
+	 * If a backing gfid was not specified, interpret any remaining bytes
+	 * associated with a backing image as a filename local to the parent
+	 * directory. The format processing will validate further.
+	 */
+	if (!uuid_is_null(gfid))
+		uuid_copy(qb_inode->backing_gfid, gfid);
+	else if (s)
+		qb_inode->backing_fname = gf_strdup(s);
+
+	inode_ctx_set (inode, this, (void *)&qb_inode);
+
+	GF_FREE(formatstr);
+
+	return 0;
+
+invalid:
+	GF_FREE(formatstr);
+
+	gf_log (this->name, GF_LOG_WARNING,
+		"invalid format '%s' in inode %s", format,
+		uuid_utoa (inode->gfid));
+	return EINVAL;
+}
+
+
+void
+qb_local_free (xlator_t *this, qb_local_t *local)
+{
+	if (local->inode)
+		inode_unref (local->inode);
+	if (local->fd)
+		fd_unref (local->fd);
+	GF_FREE (local);
+}
+
+
+int
+qb_local_init (call_frame_t *frame)
+{
+	qb_local_t *qb_local = NULL;
+
+	qb_local = GF_CALLOC (1, sizeof (*qb_local), gf_qb_mt_qb_local_t);
+	if (!qb_local)
+		return -1;
+	INIT_LIST_HEAD(&qb_local->list);
+
+	qb_local->frame = frame;
+	frame->local = qb_local;
+
+	return 0;
+}
+
+
+int
+qb_lookup_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+	       int op_ret, int op_errno, inode_t *inode, struct iatt *buf,
+	       dict_t *xdata, struct iatt *postparent)
+{
+	char *format = NULL;
+	qb_conf_t *conf = NULL;
+
+	conf = this->private;
+
+	if (op_ret == -1)
+		goto out;
+
+	/*
+	 * Cache the root inode for dealing with backing images. The format
+	 * coroutine and the gluster qemu backend driver both use the root inode
+	 * table to verify and/or redirect I/O to the backing image via
+	 * anonymous fd's.
+	 */
+	if (!conf->root_inode && __is_root_gfid(inode->gfid))
+		conf->root_inode = inode_ref(inode);
+
+	if (!xdata)
+		goto out;
+
+	if (dict_get_str (xdata, conf->qb_xattr_key, &format))
+		goto out;
+
+	if (!format) {
+		qb_inode_cleanup (this, inode, 1);
+		goto out;
+	}
+
+	op_errno = qb_format_extract (this, format, inode);
+	if (op_errno)
+		op_ret = -1;
+
+	qb_iatt_fixup (this, inode, buf);
+out:
+	QB_STACK_UNWIND (lookup, frame, op_ret, op_errno, inode, buf,
+			 xdata, postparent);
+	return 0;
+}
+
+
+int
+qb_lookup (call_frame_t *frame, xlator_t *this, loc_t *loc, dict_t *xdata)
+{
+	qb_conf_t *conf = NULL;
+
+	conf = this->private;
+
+	xdata = xdata ? dict_ref (xdata) : dict_new ();
+
+	if (!xdata)
+		goto enomem;
+
+	if (dict_set_int32 (xdata, conf->qb_xattr_key, 0))
+		goto enomem;
+
+	STACK_WIND (frame, qb_lookup_cbk, FIRST_CHILD(this),
+		    FIRST_CHILD(this)->fops->lookup, loc, xdata);
+	dict_unref (xdata);
+	return 0;
+enomem:
+	QB_STACK_UNWIND (lookup, frame, -1, ENOMEM, 0, 0, 0, 0);
+	if (xdata)
+		dict_unref (xdata);
+	return 0;
+}
+
+
+int
+qb_setxattr_format (call_frame_t *frame, xlator_t *this, call_stub_t *stub,
+		    dict_t *xattr, inode_t *inode)
+{
+	char *format = NULL;
+	int op_errno = 0;
+	qb_local_t *qb_local = NULL;
+	data_t *data = NULL;
+	qb_inode_t *qb_inode;
+
+	if (!(data = dict_get (xattr, "trusted.glusterfs.block-format"))) {
+		QB_STUB_RESUME (stub);
+		return 0;
+	}
+
+	format = alloca (data->len + 1);
+	memcpy (format, data->data, data->len);
+	format[data->len] = 0;
+
+	op_errno = qb_format_extract (this, format, inode);
+	if (op_errno) {
+		QB_STUB_UNWIND (stub, -1, op_errno);
+		return 0;
+	}
+	qb_inode = qb_inode_ctx_get(this, inode);
+
+	qb_local = frame->local;
+
+	qb_local->stub = stub;
+	qb_local->inode = inode_ref (inode);
+
+	snprintf(qb_local->fmt, QB_XATTR_VAL_MAX, "%s:%lu", qb_inode->fmt,
+		 qb_inode->size);
+
+	qb_coroutine (frame, qb_format_and_resume);
+
+	return 0;
+}
+
+
+int
+qb_setxattr_snapshot_create (call_frame_t *frame, xlator_t *this,
+			     call_stub_t *stub, dict_t *xattr, inode_t *inode)
+{
+	qb_local_t *qb_local = NULL;
+	char *name = NULL;
+	data_t *data = NULL;
+
+	if (!(data = dict_get (xattr, "trusted.glusterfs.block-snapshot-create"))) {
+		QB_STUB_RESUME (stub);
+		return 0;
+	}
+
+	name = alloca (data->len + 1);
+	memcpy (name, data->data, data->len);
+	name[data->len] = 0;
+
+	qb_local = frame->local;
+
+	qb_local->stub = stub;
+	qb_local->inode = inode_ref (inode);
+	strncpy (qb_local->name, name, 128);
+
+	qb_coroutine (frame, qb_snapshot_create);
+
+	return 0;
+}
+
+
+int
+qb_setxattr_snapshot_delete (call_frame_t *frame, xlator_t *this,
+			     call_stub_t *stub, dict_t *xattr, inode_t *inode)
+{
+	qb_local_t *qb_local = NULL;
+	char *name = NULL;
+	data_t *data = NULL;
+
+	if (!(data = dict_get (xattr, "trusted.glusterfs.block-snapshot-delete"))) {
+		QB_STUB_RESUME (stub);
+		return 0;
+	}
+
+	name = alloca (data->len + 1);
+	memcpy (name, data->data, data->len);
+	name[data->len] = 0;
+
+	qb_local = frame->local;
+
+	qb_local->stub = stub;
+	qb_local->inode = inode_ref (inode);
+	strncpy (qb_local->name, name, 128);
+
+	qb_coroutine (frame, qb_snapshot_delete);
+
+	return 0;
+}
+
+int
+qb_setxattr_snapshot_goto (call_frame_t *frame, xlator_t *this,
+			   call_stub_t *stub, dict_t *xattr, inode_t *inode)
+{
+	qb_local_t *qb_local = NULL;
+	char *name = NULL;
+	data_t *data = NULL;
+
+	if (!(data = dict_get (xattr, "trusted.glusterfs.block-snapshot-goto"))) {
+		QB_STUB_RESUME (stub);
+		return 0;
+	}
+
+	name = alloca (data->len + 1);
+	memcpy (name, data->data, data->len);
+	name[data->len] = 0;
+
+	qb_local = frame->local;
+
+	qb_local->stub = stub;
+	qb_local->inode = inode_ref (inode);
+	strncpy (qb_local->name, name, 128);
+
+	qb_coroutine (frame, qb_snapshot_goto);
+
+	return 0;
+}
+
+
+int
+qb_setxattr_common (call_frame_t *frame, xlator_t *this, call_stub_t *stub,
+		    dict_t *xattr, inode_t *inode)
+{
+	data_t *data = NULL;
+
+	if ((data = dict_get (xattr, "trusted.glusterfs.block-format"))) {
+		qb_setxattr_format (frame, this, stub, xattr, inode);
+		return 0;
+	}
+
+	if ((data = dict_get (xattr, "trusted.glusterfs.block-snapshot-create"))) {
+		qb_setxattr_snapshot_create (frame, this, stub, xattr, inode);
+		return 0;
+	}
+
+	if ((data = dict_get (xattr, "trusted.glusterfs.block-snapshot-delete"))) {
+		qb_setxattr_snapshot_delete (frame, this, stub, xattr, inode);
+		return 0;
+	}
+
+	if ((data = dict_get (xattr, "trusted.glusterfs.block-snapshot-goto"))) {
+		qb_setxattr_snapshot_goto (frame, this, stub, xattr, inode);
+		return 0;
+	}
+
+	QB_STUB_RESUME (stub);
+
+	return 0;
+}
+
+
+int
+qb_setxattr (call_frame_t *frame, xlator_t *this, loc_t *loc, dict_t *xattr,
+	     int flags, dict_t *xdata)
+{
+	call_stub_t *stub = NULL;
+
+	if (qb_local_init (frame) != 0)
+		goto enomem;
+
+	stub = fop_setxattr_stub (frame, default_setxattr_resume, loc, xattr,
+				  flags, xdata);
+	if (!stub)
+		goto enomem;
+
+	qb_setxattr_common (frame, this, stub, xattr, loc->inode);
+
+	return 0;
+enomem:
+	QB_STACK_UNWIND (setxattr, frame, -1, ENOMEM, 0);
+	return 0;
+}
+
+
+int
+qb_fsetxattr (call_frame_t *frame, xlator_t *this, fd_t *fd, dict_t *xattr,
+	      int flags, dict_t *xdata)
+{
+	call_stub_t *stub = NULL;
+
+	if (qb_local_init (frame) != 0)
+		goto enomem;
+
+	stub = fop_fsetxattr_stub (frame, default_fsetxattr_resume, fd, xattr,
+				   flags, xdata);
+	if (!stub)
+		goto enomem;
+
+	qb_setxattr_common (frame, this, stub, xattr, fd->inode);
+
+	return 0;
+enomem:
+	QB_STACK_UNWIND (fsetxattr, frame, -1, ENOMEM, 0);
+	return 0;
+}
+
+
+int
+qb_open_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+	     int op_ret, int op_errno, fd_t *fd, dict_t *xdata)
+{
+	call_stub_t *stub = NULL;
+	qb_local_t *qb_local = NULL;
+
+	qb_local = frame->local;
+
+	if (op_ret < 0)
+		goto unwind;
+
+	if (!qb_inode_ctx_get (this, qb_local->inode))
+		goto unwind;
+
+	stub = fop_open_cbk_stub (frame, NULL, op_ret, op_errno, fd, xdata);
+	if (!stub) {
+		op_ret = -1;
+		op_errno = ENOMEM;
+		goto unwind;
+	}
+
+	qb_local->stub = stub;
+
+	qb_coroutine (frame, qb_co_open);
+
+	return 0;
+unwind:
+	QB_STACK_UNWIND (open, frame, op_ret, op_errno, fd, xdata);
+	return 0;
+}
+
+
+int
+qb_open (call_frame_t *frame, xlator_t *this, loc_t *loc, int flags,
+	 fd_t *fd, dict_t *xdata)
+{
+	qb_local_t *qb_local = NULL;
+	qb_inode_t *qb_inode = NULL;
+
+	qb_inode = qb_inode_ctx_get (this, loc->inode);
+	if (!qb_inode) {
+		STACK_WIND (frame, default_open_cbk, FIRST_CHILD(this),
+			    FIRST_CHILD(this)->fops->open, loc, flags, fd,
+			    xdata);
+		return 0;
+	}
+
+	if (qb_local_init (frame) != 0)
+		goto enomem;
+
+	qb_local = frame->local;
+
+	qb_local->inode = inode_ref (loc->inode);
+	qb_local->fd = fd_ref (fd);
+
+	STACK_WIND (frame, qb_open_cbk, FIRST_CHILD(this),
+		    FIRST_CHILD(this)->fops->open, loc, flags, fd, xdata);
+	return 0;
+enomem:
+	QB_STACK_UNWIND (open, frame, -1, ENOMEM, 0, 0);
+	return 0;
+}
+
+
+int
+qb_writev (call_frame_t *frame, xlator_t *this, fd_t *fd, struct iovec *vector,
+	   int count, off_t offset, uint32_t flags, struct iobref *iobref,
+	   dict_t *xdata)
+{
+	qb_local_t *qb_local = NULL;
+	qb_inode_t *qb_inode = NULL;
+
+	qb_inode = qb_inode_ctx_get (this, fd->inode);
+	if (!qb_inode) {
+		STACK_WIND (frame, default_writev_cbk, FIRST_CHILD(this),
+			    FIRST_CHILD(this)->fops->writev, fd, vector, count,
+			    offset, flags, iobref, xdata);
+		return 0;
+	}
+
+	if (qb_local_init (frame) != 0)
+		goto enomem;
+
+	qb_local = frame->local;
+
+	qb_local->inode = inode_ref (fd->inode);
+	qb_local->fd = fd_ref (fd);
+
+	qb_local->stub = fop_writev_stub (frame, NULL, fd, vector, count,
+					  offset, flags, iobref, xdata);
+	if (!qb_local->stub)
+		goto enomem;
+
+	qb_coroutine (frame, qb_co_writev);
+
+	return 0;
+enomem:
+	QB_STACK_UNWIND (writev, frame, -1, ENOMEM, 0, 0, 0);
+	return 0;
+}
+
+
+int
+qb_readv (call_frame_t *frame, xlator_t *this, fd_t *fd, size_t size,
+	  off_t offset, uint32_t flags, dict_t *xdata)
+{
+	qb_local_t *qb_local = NULL;
+	qb_inode_t *qb_inode = NULL;
+
+	qb_inode = qb_inode_ctx_get (this, fd->inode);
+	if (!qb_inode) {
+		STACK_WIND (frame, default_readv_cbk, FIRST_CHILD(this),
+			    FIRST_CHILD(this)->fops->readv, fd, size, offset,
+			    flags, xdata);
+		return 0;
+	}
+
+	if (qb_local_init (frame) != 0)
+		goto enomem;
+
+	qb_local = frame->local;
+
+	qb_local->inode = inode_ref (fd->inode);
+	qb_local->fd = fd_ref (fd);
+
+	qb_local->stub = fop_readv_stub (frame, NULL, fd, size, offset,
+					  flags, xdata);
+	if (!qb_local->stub)
+		goto enomem;
+
+	qb_coroutine (frame, qb_co_readv);
+
+	return 0;
+enomem:
+	QB_STACK_UNWIND (readv, frame, -1, ENOMEM, 0, 0, 0, 0, 0);
+	return 0;
+}
+
+
+int
+qb_fsync (call_frame_t *frame, xlator_t *this, fd_t *fd, int dsync,
+	  dict_t *xdata)
+{
+	qb_local_t *qb_local = NULL;
+	qb_inode_t *qb_inode = NULL;
+
+	qb_inode = qb_inode_ctx_get (this, fd->inode);
+	if (!qb_inode) {
+		STACK_WIND (frame, default_fsync_cbk, FIRST_CHILD(this),
+			    FIRST_CHILD(this)->fops->fsync, fd, dsync, xdata);
+		return 0;
+	}
+
+	if (qb_local_init (frame) != 0)
+		goto enomem;
+
+	qb_local = frame->local;
+
+	qb_local->inode = inode_ref (fd->inode);
+	qb_local->fd = fd_ref (fd);
+
+	qb_local->stub = fop_fsync_stub (frame, NULL, fd, dsync, xdata);
+
+	if (!qb_local->stub)
+		goto enomem;
+
+	qb_coroutine (frame, qb_co_fsync);
+
+	return 0;
+enomem:
+	QB_STACK_UNWIND (fsync, frame, -1, ENOMEM, 0, 0, 0);
+	return 0;
+}
+
+
+int
+qb_flush (call_frame_t *frame, xlator_t *this, fd_t *fd, dict_t *xdata)
+{
+	qb_local_t *qb_local = NULL;
+	qb_inode_t *qb_inode = NULL;
+
+	qb_inode = qb_inode_ctx_get (this, fd->inode);
+	if (!qb_inode) {
+		STACK_WIND (frame, default_flush_cbk, FIRST_CHILD(this),
+			    FIRST_CHILD(this)->fops->flush, fd, xdata);
+		return 0;
+	}
+
+	if (qb_local_init (frame) != 0)
+		goto enomem;
+
+	qb_local = frame->local;
+
+	qb_local->inode = inode_ref (fd->inode);
+	qb_local->fd = fd_ref (fd);
+
+	qb_local->stub = fop_flush_stub (frame, NULL, fd, xdata);
+
+	if (!qb_local->stub)
+		goto enomem;
+
+	qb_coroutine (frame, qb_co_fsync);
+
+	return 0;
+enomem:
+	QB_STACK_UNWIND (flush, frame, -1, ENOMEM, 0);
+	return 0;
+}
+
+static int32_t
+qb_readdirp_cbk(call_frame_t *frame, void *cookie, xlator_t *this,
+		int32_t op_ret, int32_t op_errno, gf_dirent_t *entries,
+		dict_t *xdata)
+{
+	qb_conf_t *conf = this->private;
+	gf_dirent_t *entry;
+	char *format;
+
+	list_for_each_entry(entry, &entries->list, list) {
+		if (!entry->inode || !entry->dict)
+			continue;
+
+		format = NULL;
+		if (dict_get_str(entry->dict, conf->qb_xattr_key, &format))
+			continue;
+
+		if (!format) {
+			qb_inode_cleanup(this, entry->inode, 1);
+			continue;
+		}
+
+		if (qb_format_extract(this, format, entry->inode))
+			continue;
+
+		qb_iatt_fixup(this, entry->inode, &entry->d_stat);
+	}
+
+	STACK_UNWIND_STRICT(readdirp, frame, op_ret, op_errno, entries, xdata);
+	return 0;
+}
+
+static int32_t
+qb_readdirp(call_frame_t *frame, xlator_t *this, fd_t *fd, size_t size,
+	    off_t off, dict_t *xdata)
+{
+	qb_conf_t *conf = this->private;
+
+	xdata = xdata ? dict_ref(xdata) : dict_new();
+	if (!xdata)
+		goto enomem;
+
+	if (dict_set_int32 (xdata, conf->qb_xattr_key, 0))
+		goto enomem;
+
+	STACK_WIND(frame, qb_readdirp_cbk, FIRST_CHILD(this),
+		   FIRST_CHILD(this)->fops->readdirp, fd, size, off, xdata);
+
+	dict_unref(xdata);
+	return 0;
+
+enomem:
+	QB_STACK_UNWIND(readdirp, frame, -1, ENOMEM, NULL, NULL);
+	if (xdata)
+		dict_unref(xdata);
+	return 0;
+}
+
+int
+qb_truncate (call_frame_t *frame, xlator_t *this, loc_t *loc, off_t offset,
+	     dict_t *xdata)
+{
+	qb_local_t *qb_local = NULL;
+	qb_inode_t *qb_inode = NULL;
+
+	qb_inode = qb_inode_ctx_get (this, loc->inode);
+	if (!qb_inode) {
+		STACK_WIND (frame, default_truncate_cbk, FIRST_CHILD(this),
+			    FIRST_CHILD(this)->fops->truncate, loc, offset,
+			    xdata);
+		return 0;
+	}
+
+	if (qb_local_init (frame) != 0)
+		goto enomem;
+
+	qb_local = frame->local;
+
+	qb_local->inode = inode_ref (loc->inode);
+	qb_local->fd = fd_anonymous (loc->inode);
+
+	qb_local->stub = fop_truncate_stub (frame, NULL, loc, offset, xdata);
+
+	if (!qb_local->stub)
+		goto enomem;
+
+	qb_coroutine (frame, qb_co_truncate);
+
+	return 0;
+enomem:
+	QB_STACK_UNWIND (truncate, frame, -1, ENOMEM, 0, 0, 0);
+	return 0;
+}
+
+
+int
+qb_ftruncate (call_frame_t *frame, xlator_t *this, fd_t *fd, off_t offset,
+	     dict_t *xdata)
+{
+	qb_local_t *qb_local = NULL;
+	qb_inode_t *qb_inode = NULL;
+
+	qb_inode = qb_inode_ctx_get (this, fd->inode);
+	if (!qb_inode) {
+		STACK_WIND (frame, default_ftruncate_cbk, FIRST_CHILD(this),
+			    FIRST_CHILD(this)->fops->ftruncate, fd, offset,
+			    xdata);
+		return 0;
+	}
+
+	if (qb_local_init (frame) != 0)
+		goto enomem;
+
+	qb_local = frame->local;
+
+	qb_local->inode = inode_ref (fd->inode);
+	qb_local->fd = fd_ref (fd);
+
+	qb_local->stub = fop_ftruncate_stub (frame, NULL, fd, offset, xdata);
+
+	if (!qb_local->stub)
+		goto enomem;
+
+	qb_coroutine (frame, qb_co_truncate);
+
+	return 0;
+enomem:
+	QB_STACK_UNWIND (ftruncate, frame, -1, ENOMEM, 0, 0, 0);
+	return 0;
+}
+
+
+int
+qb_stat_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+	     int op_ret, int op_errno, struct iatt *iatt, dict_t *xdata)
+{
+	inode_t *inode = NULL;
+
+	inode = frame->local;
+	frame->local = NULL;
+
+	if (inode) {
+		qb_iatt_fixup (this, inode, iatt);
+		inode_unref (inode);
+	}
+
+	QB_STACK_UNWIND (stat, frame, op_ret, op_errno, iatt, xdata);
+
+	return 0;
+}
+
+int
+qb_stat (call_frame_t *frame, xlator_t *this, loc_t *loc, dict_t *xdata)
+{
+	if (qb_inode_ctx_get (this, loc->inode))
+		frame->local = inode_ref (loc->inode);
+
+	STACK_WIND (frame, qb_stat_cbk, FIRST_CHILD(this),
+		    FIRST_CHILD(this)->fops->stat, loc, xdata);
+	return 0;
+}
+
+
+int
+qb_fstat_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+	      int op_ret, int op_errno, struct iatt *iatt, dict_t *xdata)
+{
+	inode_t *inode = NULL;
+
+	inode = frame->local;
+	frame->local = NULL;
+
+	if (inode) {
+		qb_iatt_fixup (this, inode, iatt);
+		inode_unref (inode);
+	}
+
+	QB_STACK_UNWIND (fstat, frame, op_ret, op_errno, iatt, xdata);
+
+	return 0;
+}
+
+
+int
+qb_fstat (call_frame_t *frame, xlator_t *this, fd_t *fd, dict_t *xdata)
+{
+	if (qb_inode_ctx_get (this, fd->inode))
+		frame->local = inode_ref (fd->inode);
+
+	STACK_WIND (frame, qb_fstat_cbk, FIRST_CHILD(this),
+		    FIRST_CHILD(this)->fops->fstat, fd, xdata);
+	return 0;
+}
+
+
+int
+qb_setattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+		int op_ret, int op_errno, struct iatt *pre, struct iatt *post,
+		dict_t *xdata)
+{
+	inode_t *inode = NULL;
+
+	inode = frame->local;
+	frame->local = NULL;
+
+	if (inode) {
+		qb_iatt_fixup (this, inode, pre);
+		qb_iatt_fixup (this, inode, post);
+		inode_unref (inode);
+	}
+
+	QB_STACK_UNWIND (setattr, frame, op_ret, op_errno, pre, post, xdata);
+
+	return 0;
+}
+
+
+int
+qb_setattr (call_frame_t *frame, xlator_t *this, loc_t *loc, struct iatt *buf,
+	    int valid, dict_t *xdata)
+{
+	if (qb_inode_ctx_get (this, loc->inode))
+		frame->local = inode_ref (loc->inode);
+
+	STACK_WIND (frame, qb_setattr_cbk, FIRST_CHILD(this),
+		    FIRST_CHILD(this)->fops->setattr, loc, buf, valid, xdata);
+	return 0;
+}
+
+
+int
+qb_fsetattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+		 int op_ret, int op_errno, struct iatt *pre, struct iatt *post,
+		 dict_t *xdata)
+{
+	inode_t *inode = NULL;
+
+	inode = frame->local;
+	frame->local = NULL;
+
+	if (inode) {
+		qb_iatt_fixup (this, inode, pre);
+		qb_iatt_fixup (this, inode, post);
+		inode_unref (inode);
+	}
+
+	QB_STACK_UNWIND (fsetattr, frame, op_ret, op_errno, pre, post, xdata);
+
+	return 0;
+}
+
+
+int
+qb_fsetattr (call_frame_t *frame, xlator_t *this, fd_t *fd, struct iatt *buf,
+	     int valid, dict_t *xdata)
+{
+	if (qb_inode_ctx_get (this, fd->inode))
+		frame->local = inode_ref (fd->inode);
+
+	STACK_WIND (frame, qb_setattr_cbk, FIRST_CHILD(this),
+		    FIRST_CHILD(this)->fops->fsetattr, fd, buf, valid, xdata);
+	return 0;
+}
+
+
+int
+qb_forget (xlator_t *this, inode_t *inode)
+{
+	return qb_inode_cleanup (this, inode, 0);
+}
+
+
+int
+qb_release (xlator_t *this, fd_t *fd)
+{
+	call_frame_t *frame = NULL;
+
+	frame = create_frame (this, this->ctx->pool);
+	if (!frame) {
+		gf_log (this->name, GF_LOG_ERROR,
+			"Could not allocate frame. "
+			"Leaking QEMU BlockDriverState");
+		return -1;
+	}
+
+	if (qb_local_init (frame) != 0) {
+		gf_log (this->name, GF_LOG_ERROR,
+			"Could not allocate local. "
+			"Leaking QEMU BlockDriverState");
+		STACK_DESTROY (frame->root);
+		return -1;
+	}
+
+	if (qb_coroutine (frame, qb_co_close) != 0) {
+		gf_log (this->name, GF_LOG_ERROR,
+			"Could not allocate coroutine. "
+			"Leaking QEMU BlockDriverState");
+		qb_local_free (this, frame->local);
+		frame->local = NULL;
+		STACK_DESTROY (frame->root);
+	}
+
+	return 0;
+}
+
+int
+mem_acct_init (xlator_t *this)
+{
+        int     ret = -1;
+
+        ret = xlator_mem_acct_init (this, gf_qb_mt_end + 1);
+
+        if (ret)
+                gf_log (this->name, GF_LOG_ERROR, "Memory accounting init "
+                        "failed");
+        return ret;
+}
+
+
+int
+reconfigure (xlator_t *this, dict_t *options)
+{
+	return 0;
+}
+
+
+int
+init (xlator_t *this)
+{
+        qb_conf_t *conf    = NULL;
+        int32_t    ret     = -1;
+	static int bdrv_inited = 0;
+
+        if (!this->children || this->children->next) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "FATAL: qemu-block (%s) not configured with exactly "
+                        "one child", this->name);
+                goto out;
+        }
+
+        conf = GF_CALLOC (1, sizeof (*conf), gf_qb_mt_qb_conf_t);
+        if (!conf)
+                goto out;
+
+        /* configure 'option window-size <size>' */
+        GF_OPTION_INIT ("default-password", conf->default_password, str, out);
+
+	/* qemu coroutines use "co_mutex" for synchronizing among themselves.
+	   However "co_mutex" itself is not threadsafe if the coroutine framework
+	   is multithreaded (which usually is not). However synctasks are
+	   fundamentally multithreaded, so for now create a syncenv which has
+	   scaling limits set to max 1 thread so that the qemu coroutines can
+	   execute "safely".
+
+	   Future work: provide an implementation of "co_mutex" which is
+	   threadsafe and use the global multithreaded ctx->env syncenv.
+	*/
+	conf->env = syncenv_new (0, 1, 1);
+
+        this->private = conf;
+
+        ret = 0;
+
+	snprintf (conf->qb_xattr_key, QB_XATTR_KEY_MAX, QB_XATTR_KEY_FMT,
+		  this->name);
+
+	cur_mon = (void *) 1;
+
+	if (!bdrv_inited) {
+		bdrv_init ();
+		bdrv_inited = 1;
+	}
+
+out:
+        if (ret)
+                GF_FREE (conf);
+
+        return ret;
+}
+
+
+void
+fini (xlator_t *this)
+{
+        qb_conf_t *conf = NULL;
+
+        conf = this->private;
+
+        this->private = NULL;
+
+	if (conf->root_inode)
+		inode_unref(conf->root_inode);
+        GF_FREE (conf);
+
+	return;
+}
+
+
+struct xlator_fops fops = {
+	.lookup      = qb_lookup,
+	.fsetxattr   = qb_fsetxattr,
+	.setxattr    = qb_setxattr,
+	.open        = qb_open,
+        .writev      = qb_writev,
+        .readv       = qb_readv,
+        .fsync       = qb_fsync,
+        .truncate    = qb_truncate,
+        .ftruncate   = qb_ftruncate,
+        .stat        = qb_stat,
+        .fstat       = qb_fstat,
+	.setattr     = qb_setattr,
+	.fsetattr    = qb_fsetattr,
+        .flush       = qb_flush,
+/*
+	.getxattr    = qb_getxattr,
+	.fgetxattr   = qb_fgetxattr
+*/
+	.readdirp    = qb_readdirp,
+};
+
+
+struct xlator_cbks cbks = {
+        .forget   = qb_forget,
+	.release  = qb_release,
+};
+
+
+struct xlator_dumpops dumpops = {
+};
+
+
+struct volume_options options[] = {
+        { .key  = {"default-password"},
+          .type = GF_OPTION_TYPE_STR,
+          .default_value = "",
+          .description = "Default password for the AES encrypted block images."
+        },
+        { .key = {NULL} },
+};
diff --git a/xlators/features/qemu-block/src/qemu-block.h b/xlators/features/qemu-block/src/qemu-block.h
new file mode 100644
index 000000000..c95f2799a
--- /dev/null
+++ b/xlators/features/qemu-block/src/qemu-block.h
@@ -0,0 +1,109 @@
+/*
+  Copyright (c) 2013 Red Hat, Inc. <http://www.redhat.com>
+  This file is part of GlusterFS.
+
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
+*/
+
+#ifndef __QEMU_BLOCK_H
+#define __QEMU_BLOCK_H
+
+#include "syncop.h"
+#include "call-stub.h"
+#include "block/block_int.h"
+#include "monitor/monitor.h"
+
+/* QB_XATTR_KEY_FMT is the on-disk xattr stored in the inode which
+   indicates that the file must be "interpreted" by the block format
+   logic. The value of the key is of the pattern:
+
+   "format:virtual_size"
+
+   e.g
+
+   "qcow2:20GB" or "qed:100GB"
+
+   The format and virtual size are colon separated. The format is
+   a case sensitive string which qemu recognizes. virtual_size is
+   specified as a size which glusterfs recognizes as size (i.e.,
+   value accepted by gf_string2bytesize())
+*/
+#define QB_XATTR_KEY_FMT "trusted.glusterfs.%s.format"
+
+#define QB_XATTR_KEY_MAX 64
+
+#define QB_XATTR_VAL_MAX 64
+
+
+typedef struct qb_inode {
+	char fmt[QB_XATTR_VAL_MAX]; /* this is only the format, not "format:size" */
+	size_t size; /* virtual size in bytes */
+	BlockDriverState *bs;
+	int refcnt;
+	uuid_t backing_gfid;
+	char *backing_fname;
+} qb_inode_t;
+
+
+typedef struct qb_conf {
+	Monitor *mon;
+	struct syncenv *env;
+	char qb_xattr_key[QB_XATTR_KEY_MAX];
+	char *default_password;
+	inode_t *root_inode;
+} qb_conf_t;
+
+
+typedef struct qb_local {
+	call_frame_t      *frame; /* backpointer */
+	call_stub_t       *stub;
+	inode_t           *inode;
+	fd_t              *fd;
+	char               fmt[QB_XATTR_VAL_MAX+1];
+	char               name[256];
+	synctask_fn_t      synctask_fn;
+	struct list_head   list;
+} qb_local_t;
+
+void qb_local_free (xlator_t *this, qb_local_t *local);
+int qb_coroutine (call_frame_t *frame, synctask_fn_t fn);
+inode_t *qb_inode_from_filename (const char *filename);
+int qb_inode_to_filename (inode_t *inode, char *filename, int size);
+int qb_format_extract (xlator_t *this, char *format, inode_t *inode);
+
+qb_inode_t *qb_inode_ctx_get (xlator_t *this, inode_t *inode);
+
+#define QB_STACK_UNWIND(typ, frame, args ...) do {	\
+	qb_local_t *__local = frame->local;		\
+	xlator_t *__this = frame->this;			\
+							\
+	frame->local = NULL;				\
+	STACK_UNWIND_STRICT (typ, frame, args);		\
+	if (__local)					\
+		qb_local_free (__this, __local);	\
+	} while (0)
+
+#define QB_STUB_UNWIND(stub, op_ret, op_errno) do {	\
+	qb_local_t *__local = stub->frame->local;	\
+	xlator_t *__this = stub->frame->this;		\
+							\
+	stub->frame->local = NULL;			\
+	call_unwind_error (stub, op_ret, op_errno);	\
+	if (__local)					\
+		qb_local_free (__this, __local);	\
+	} while (0)
+
+#define QB_STUB_RESUME(stub_errno) do {			\
+	qb_local_t *__local = stub->frame->local;	\
+	xlator_t *__this = stub->frame->this;		\
+							\
+	stub->frame->local = NULL;			\
+	call_resume (stub);				\
+	if (__local)					\
+		qb_local_free (__this, __local);	\
+	} while (0)
+
+#endif /* !__QEMU_BLOCK_H */
diff --git a/xlators/features/quiesce/src/quiesce.c b/xlators/features/quiesce/src/quiesce.c
index 73eb91947..24c7dc6ed 100644
--- a/xlators/features/quiesce/src/quiesce.c
+++ b/xlators/features/quiesce/src/quiesce.c
@@ -111,7 +111,7 @@ void
 gf_quiesce_enqueue (xlator_t *this, call_stub_t *stub)
 {
         quiesce_priv_t *priv    = NULL;
-        struct timeval  timeout = {0,};
+        struct timespec timeout = {0,};
 
         priv = this->private;
         if (!priv) {
@@ -129,7 +129,7 @@ gf_quiesce_enqueue (xlator_t *this, call_stub_t *stub)
 
         if (!priv->timer) {
                 timeout.tv_sec = 20;
-                timeout.tv_usec = 0;
+                timeout.tv_nsec = 0;
 
                 priv->timer = gf_timer_call_after (this->ctx,
                                                    timeout,
@@ -2492,7 +2492,7 @@ notify (xlator_t *this, int event, void *data, ...)
 {
         int             ret     = 0;
         quiesce_priv_t *priv    = NULL;
-        struct timeval  timeout = {0,};
+        struct timespec timeout = {0,};
 
         priv = this->private;
         if (!priv)
@@ -2525,7 +2525,7 @@ notify (xlator_t *this, int event, void *data, ...)
                 if (priv->timer)
                         break;
                 timeout.tv_sec = 20;
-                timeout.tv_usec = 0;
+                timeout.tv_nsec = 0;
 
                 priv->timer = gf_timer_call_after (this->ctx,
                                                    timeout,
diff --git a/xlators/features/quota/src/quota.c b/xlators/features/quota/src/quota.c
index 4ea54cca8..c527e7ca7 100644
--- a/xlators/features/quota/src/quota.c
+++ b/xlators/features/quota/src/quota.c
@@ -2969,6 +2969,177 @@ err:
         return 0;
 }
 
+int32_t
+quota_fallocate_cbk(call_frame_t *frame, void *cookie, xlator_t *this,
+                    int32_t op_ret, int32_t op_errno, struct iatt *prebuf,
+                    struct iatt *postbuf, dict_t *xdata)
+{
+        int32_t                  ret            = 0;
+        uint64_t                 ctx_int        = 0;
+        quota_inode_ctx_t       *ctx            = NULL;
+        quota_local_t           *local          = NULL;
+        quota_dentry_t          *dentry         = NULL;
+        int64_t                  delta          = 0;
+
+        local = frame->local;
+
+        if ((op_ret < 0) || (local == NULL)) {
+                goto out;
+        }
+
+        ret = inode_ctx_get (local->loc.inode, this, &ctx_int);
+        if (ret) {
+                gf_log (this->name, GF_LOG_WARNING,
+                        "%s: failed to get the context", local->loc.path);
+                goto out;
+        }
+
+        ctx = (quota_inode_ctx_t *)(unsigned long) ctx_int;
+
+        if (ctx == NULL) {
+                gf_log (this->name, GF_LOG_WARNING,
+                        "quota context not set in %s (gfid:%s)",
+                        local->loc.path, uuid_utoa (local->loc.inode->gfid));
+                goto out;
+        }
+
+        LOCK (&ctx->lock);
+        {
+                ctx->buf = *postbuf;
+        }
+        UNLOCK (&ctx->lock);
+
+        list_for_each_entry (dentry, &ctx->parents, next) {
+                delta = (postbuf->ia_blocks - prebuf->ia_blocks) * 512;
+                quota_update_size (this, local->loc.inode,
+                                   dentry->name, dentry->par, delta);
+        }
+
+out:
+        QUOTA_STACK_UNWIND (fallocate, frame, op_ret, op_errno, prebuf, postbuf,
+                            xdata);
+
+        return 0;
+}
+
+int32_t
+quota_fallocate_helper(call_frame_t *frame, xlator_t *this, fd_t *fd,
+		       int32_t mode, off_t offset, size_t len, dict_t *xdata)
+{
+        quota_local_t *local    = NULL;
+        int32_t        op_errno = EINVAL;
+
+        local = frame->local;
+        if (local == NULL) {
+                gf_log (this->name, GF_LOG_WARNING, "local is NULL");
+                goto unwind;
+        }
+
+        if (local->op_ret == -1) {
+                op_errno = local->op_errno;
+                goto unwind;
+        }
+
+        STACK_WIND (frame, quota_fallocate_cbk, FIRST_CHILD(this),
+                    FIRST_CHILD(this)->fops->fallocate, fd, mode, offset, len,
+		    xdata);
+        return 0;
+
+unwind:
+        QUOTA_STACK_UNWIND (fallocate, frame, -1, op_errno, NULL, NULL, NULL);
+        return 0;
+}
+
+int32_t
+quota_fallocate(call_frame_t *frame, xlator_t *this, fd_t *fd, int32_t mode,
+		off_t offset, size_t len, dict_t *xdata)
+{
+        int32_t            ret     = -1, op_errno = EINVAL;
+        int32_t            parents = 0;
+        quota_local_t     *local   = NULL;
+        quota_inode_ctx_t *ctx     = NULL;
+        quota_priv_t      *priv    = NULL;
+        call_stub_t       *stub    = NULL;
+        quota_dentry_t    *dentry  = NULL;
+
+        GF_ASSERT (frame);
+        GF_VALIDATE_OR_GOTO ("quota", this, unwind);
+        GF_VALIDATE_OR_GOTO (this->name, fd, unwind);
+
+        local = quota_local_new ();
+        if (local == NULL) {
+                goto unwind;
+        }
+
+        frame->local = local;
+        local->loc.inode = inode_ref (fd->inode);
+
+        ret = quota_inode_ctx_get (fd->inode, -1, this, NULL, NULL, &ctx, 0);
+        if (ctx == NULL) {
+                gf_log (this->name, GF_LOG_WARNING,
+                        "quota context not set in inode (gfid:%s)",
+                        uuid_utoa (fd->inode->gfid));
+                goto unwind;
+        }
+
+        stub = fop_fallocate_stub(frame, quota_fallocate_helper, fd, mode, offset, len,
+				  xdata); 
+        if (stub == NULL) {
+                op_errno = ENOMEM;
+                goto unwind;
+        }
+
+        priv = this->private;
+        GF_VALIDATE_OR_GOTO (this->name, priv, unwind);
+
+        LOCK (&ctx->lock);
+        {
+                list_for_each_entry (dentry, &ctx->parents, next) {
+                        parents++;
+                }
+        }
+        UNLOCK (&ctx->lock);
+
+	/*
+	 * Note that by using len as the delta we're assuming the range from
+	 * offset to offset+len has not already been allocated. This can result
+	 * in ENOSPC errors attempting to allocate an already allocated range.
+	 */
+        local->delta = len;
+        local->stub = stub;
+        local->link_count = parents;
+
+        list_for_each_entry (dentry, &ctx->parents, next) {
+                ret = quota_check_limit (frame, fd->inode, this, dentry->name,
+                                         dentry->par);
+                if (ret == -1) {
+                        break;
+                }
+        }
+
+        stub = NULL;
+
+        LOCK (&local->lock);
+        {
+                local->link_count = 0;
+                if (local->validate_count == 0) {
+                        stub = local->stub;
+                        local->stub = NULL;
+                }
+        }
+        UNLOCK (&local->lock);
+
+        if (stub != NULL) {
+                call_resume (stub);
+        }
+
+        return 0;
+
+unwind:
+        QUOTA_STACK_UNWIND (fallocate, frame, -1, op_errno, NULL, NULL, NULL);
+        return 0;
+}
+
 
 int32_t
 mem_acct_init (xlator_t *this)
@@ -3304,6 +3475,7 @@ struct xlator_fops fops = {
         .removexattr  = quota_removexattr,
         .fremovexattr = quota_fremovexattr,
         .readdirp     = quota_readdirp,
+	.fallocate    = quota_fallocate,
 };
 
 struct xlator_cbks cbks = {
diff --git a/xlators/lib/src/libxlator.c b/xlators/lib/src/libxlator.c
index 624a929d0..9e5357255 100644
--- a/xlators/lib/src/libxlator.c
+++ b/xlators/lib/src/libxlator.c
@@ -11,6 +11,34 @@
 #include "libxlator.h"
 
 
+int marker_xtime_default_gauge[] = {
+        [MCNT_FOUND]    =  1,
+        [MCNT_NOTFOUND] = -1,
+        [MCNT_ENODATA]  = -1,
+        [MCNT_ENOTCONN] = -1,
+        [MCNT_ENOENT]   = -1,
+        [MCNT_EOTHER]   = -1,
+};
+
+int marker_uuid_default_gauge[] = {
+        [MCNT_FOUND]    =  1,
+        [MCNT_NOTFOUND] =  0,
+        [MCNT_ENODATA]  =  0,
+        [MCNT_ENOTCONN] =  0,
+        [MCNT_ENOENT]   =  0,
+        [MCNT_EOTHER]   =  0,
+};
+
+static int marker_idx_errno_map[] = {
+        [MCNT_FOUND]    = EINVAL,
+        [MCNT_NOTFOUND] = EINVAL,
+        [MCNT_ENOENT]   = ENOENT,
+        [MCNT_ENOTCONN] = ENOTCONN,
+        [MCNT_ENODATA]  = ENODATA,
+        [MCNT_EOTHER]   = EINVAL,
+        [MCNT_MAX]      = 0,
+};
+
 /*Copy the contents of oldtimebuf to newtimbuf*/
 static void
 update_timebuf (uint32_t *oldtimbuf, uint32_t *newtimebuf)
@@ -47,22 +75,61 @@ match_uuid_local (const char *name, char *uuid)
 static void
 marker_local_incr_errcount (xl_marker_local_t *local, int op_errno)
 {
+        marker_result_idx_t i = -1;
+
         if (!local)
                 return;
 
         switch (op_errno) {
                 case ENODATA:
-                        local->enodata_count++;
+                        i = MCNT_ENODATA;
                         break;
                 case ENOENT:
-                        local->enoent_count++;
+                        i = MCNT_ENOENT;
                         break;
                 case ENOTCONN:
-                        local->enotconn_count++;
+                        i = MCNT_ENOTCONN;
                         break;
                 default:
+                        i = MCNT_EOTHER;
                         break;
         }
+
+        local->count[i]++;
+}
+
+static int
+evaluate_marker_results (int *gauge, int *count)
+{
+        int i = 0;
+        int op_errno = 0;
+        gf_boolean_t sane = _gf_true;
+
+        /* check if the policy of the gauge is violated;
+         * if yes, try to get the best errno, ie. look
+         * for the first position where there is a more
+         * specific kind of vioilation than the generic EINVAL
+         */
+        for (i = 0; i < MCNT_MAX; i++) {
+                if (sane) {
+                        if ((gauge[i] > 0 && count[i] < gauge[i]) ||
+                            (gauge[i] < 0 && count[i] >= -gauge[i])) {
+                                sane = _gf_false;
+                                /* generic action: adopt corresponding errno */
+                                op_errno = marker_idx_errno_map[i];
+                        }
+                } else {
+                        /* already insane; trying to get a more informative
+                         * errno by checking subsequent counters
+                         */
+                        if (count[i] > 0)
+                                op_errno = marker_idx_errno_map[i];
+                }
+                if (op_errno && op_errno != EINVAL)
+                        break;
+        }
+
+        return op_errno;
 }
 
 /* Aggregate all the <volid>.xtime attrs of the cluster and send the max*/
@@ -98,14 +165,10 @@ cluster_markerxtime_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
         {
                 callcnt = --local->call_count;
 
-                if (local->esomerr)
-                        goto unlock;
-
                 vol_uuid = local->vol_uuid;
 
                 if (op_ret) {
                         marker_local_incr_errcount (local, op_errno);
-                        local->esomerr = op_errno;
                         goto unlock;
                 }
 
@@ -119,11 +182,11 @@ cluster_markerxtime_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                 if (dict_get_ptr (dict, marker_xattr, (void **)&net_timebuf)) {
                         gf_log (this->name, GF_LOG_WARNING,
                                 "Unable to get <uuid>.xtime attr");
-                        local->noxtime_count++;
+                        local->count[MCNT_NOTFOUND]++;
                         goto unlock;
                 }
 
-                if (local->has_xtime) {
+                if (local->count[MCNT_FOUND]) {
                         get_hosttime (net_timebuf, host_timebuf);
                         if ( (host_timebuf[0]>local->host_timebuf[0]) ||
                                 (host_timebuf[0] == local->host_timebuf[0] &&
@@ -135,7 +198,7 @@ cluster_markerxtime_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                 } else {
                         get_hosttime (net_timebuf, local->host_timebuf);
                         update_timebuf (net_timebuf, local->net_timebuf);
-                        local->has_xtime = _gf_true;
+                        local->count[MCNT_FOUND]++;
                 }
 
         }
@@ -147,7 +210,7 @@ unlock:
                 op_errno = 0;
                 need_unwind = 1;
 
-                if (local->has_xtime) {
+                if (local->count[MCNT_FOUND]) {
                         if (!dict)
                                 dict = dict_new();
 
@@ -160,17 +223,9 @@ unlock:
                         }
                 }
 
-                if (local->noxtime_count)
-                        goto out;
-
-                if (local->enodata_count || local->enotconn_count ||
-                                              local->enoent_count) {
+                op_errno = evaluate_marker_results (local->gauge, local->count);
+                if (op_errno)
                         op_ret = -1;
-                        op_errno = local->enodata_count? ENODATA:
-                                        local->enotconn_count? ENOTCONN:
-                                        local->enoent_count? ENOENT:
-                                        local->esomerr;
-                }
         }
 
 out:
@@ -228,7 +283,7 @@ cluster_markeruuid_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                 if (ret)
                         goto unlock;
 
-                if (marker_has_volinfo (local)) {
+                if (local->count[MCNT_FOUND]) {
                         if ((local->volmark->major != volmark->major) ||
                             (local->volmark->minor != volmark->minor)) {
                                 op_ret = -1;
@@ -257,6 +312,7 @@ cluster_markeruuid_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                         uuid_unparse (volmark->uuid, vol_uuid);
                         if (volmark->retval)
                                 local->retval = volmark->retval;
+                        local->count[MCNT_FOUND]++;
                 }
         }
 unlock:
@@ -267,7 +323,7 @@ unlock:
                 op_errno = 0;
                 need_unwind = 1;
 
-                if (marker_has_volinfo (local)) {
+                if (local->count[MCNT_FOUND]) {
                         if (!dict)
                                 dict = dict_new();
 
@@ -277,11 +333,10 @@ unlock:
                                 op_ret = -1;
                                 op_errno = ENOMEM;
                         }
-                } else {
-                        op_ret = -1;
-                        op_errno = local->enotconn_count? ENOTCONN:
-                               local->enoent_count? ENOENT:EINVAL;
                 }
+                op_errno = evaluate_marker_results (local->gauge, local->count);
+                if (op_errno)
+                        op_ret = -1;
         }
 
  out:
@@ -303,7 +358,7 @@ cluster_getmarkerattr (call_frame_t *frame,xlator_t *this, loc_t *loc,
                        const char *name, void *xl_local,
                        xlator_specf_unwind_t xl_specf_getxattr_unwind,
                        xlator_t **sub_volumes, int count, int type,
-                       char *vol_uuid)
+                       int *gauge, char *vol_uuid)
 {
         int                i     = 0;
         xl_marker_local_t  *local = NULL;
@@ -326,6 +381,7 @@ cluster_getmarkerattr (call_frame_t *frame,xlator_t *this, loc_t *loc,
         local->call_count = count;
         local->xl_specf_unwind = xl_specf_getxattr_unwind;
         local->vol_uuid = vol_uuid;
+        memcpy (local->gauge, gauge, sizeof (local->gauge));
 
         frame->local = local;
 
@@ -357,3 +413,58 @@ err:
         return -1;
 
 }
+
+int
+gf_get_min_stime (xlator_t *this, dict_t *dst, char *key, data_t *value)
+{
+        int ret = -1;
+        uint32_t *net_timebuf = NULL;
+        uint32_t *value_timebuf = NULL;
+        uint32_t host_timebuf[2] = {0,};
+        uint32_t host_value_timebuf[2] = {0,};
+
+        /* stime should be minimum of all the other nodes */
+        ret = dict_get_bin (dst, key, (void **)&net_timebuf);
+        if (ret < 0) {
+                net_timebuf = GF_CALLOC (1, sizeof (int64_t),
+                                           gf_common_mt_char);
+                if (!net_timebuf)
+                        goto out;
+
+                ret = dict_set_bin (dst, key, net_timebuf, sizeof (int64_t));
+                if (ret < 0) {
+                        gf_log (this->name, GF_LOG_WARNING,
+                                "key=%s: dict set failed", key);
+                        goto error;
+                }
+        }
+
+        value_timebuf = data_to_bin (value);
+        if (!value_timebuf) {
+                gf_log (this->name, GF_LOG_WARNING,
+                        "key=%s: getting value of stime failed", key);
+                ret = -1;
+                goto out;
+        }
+
+        get_hosttime (value_timebuf, host_value_timebuf);
+        get_hosttime (net_timebuf, host_timebuf);
+
+        /* can't use 'min()' macro here as we need to compare two fields
+           in the array, selectively */
+        if ((host_value_timebuf[0] > host_timebuf[0]) ||
+            ((host_value_timebuf[0] == host_timebuf[0]) &&
+             (host_value_timebuf[1] > host_timebuf[1]))) {
+                update_timebuf (value_timebuf, net_timebuf);
+        }
+
+        ret = 0;
+out:
+        return ret;
+error:
+        /* To be used only when net_timebuf is not set in the dict */
+        if (net_timebuf)
+                GF_FREE (net_timebuf);
+
+        return ret;
+}
diff --git a/xlators/lib/src/libxlator.h b/xlators/lib/src/libxlator.h
index 7e75c9482..1d5e1657f 100644
--- a/xlators/lib/src/libxlator.h
+++ b/xlators/lib/src/libxlator.h
@@ -48,6 +48,69 @@ struct volume_mark {
         uint32_t usec;
 }__attribute__ ((__packed__));
 
+
+/*
+ * The enumerated type here
+ * is used to index two kind
+ * of integer arrays:
+ * - gauges
+ * - counters
+
+ * A counter is used internally,
+ * in getxattr callbacks, to count
+ * the results, categorized as
+ * the enum names suggest. So values
+ * in the counter are always non-negative.
+
+ * Gauges are part of the API.
+ * The caller passes one to the
+ * top-level aggregator function,
+ * cluster_getmarkerattr(). The gauge
+ * defines an evaluation policy for the
+ * counter. That is, at the
+ * end of the aggregation process
+ * the gauge is matched against the
+ * counter, and the policy
+ * represented by the gauge decides
+ * whether to return with success or failure,
+ * and in latter case, what particular failure
+ * case (errno).
+
+ * The rules are the following: for some index i,
+ * - if gauge[i] == 0, no requirement is set
+ *   against counter[i];
+ * - if gauge[i] > 0, counter[i] >= gauge[i]
+ *   is required;
+ * - if gauge[i] < 0, counter[i] < |gauge[i]|
+ *   is required.
+
+ * If the requirement is not met, then i is mapped
+ * to the respective errno (MCNT_ENOENT -> ENOENT),
+ * or in lack of that, EINVAL.
+
+ * Cf. evaluate_marker_results() and marker_idx_errno_map[]
+ * in libxlator.c
+
+ * We provide two default gauges, one inteded for xtime
+ * aggregation, other for volume mark aggregation. The
+ * policies they represent agree with the hard-coded
+ * one prior to gauges. Cf. marker_xtime_default_gauge
+ * and marker_uuid_default_gauge in libxlator.c
+ */
+
+typedef enum {
+        MCNT_FOUND,
+        MCNT_NOTFOUND,
+        MCNT_ENODATA,
+        MCNT_ENOTCONN,
+        MCNT_ENOENT,
+        MCNT_EOTHER,
+        MCNT_MAX
+} marker_result_idx_t;
+
+extern int marker_xtime_default_gauge[];
+extern int marker_uuid_default_gauge[];
+
 struct marker_str {
         struct volume_mark    *volmark;
         data_t                *data;
@@ -55,13 +118,8 @@ struct marker_str {
         uint32_t               host_timebuf[2];
         uint32_t               net_timebuf[2];
         int32_t                call_count;
-        unsigned               has_xtime:1;
-        int32_t                enoent_count;
-        int32_t                enotconn_count;
-        int32_t                enodata_count;
-        int32_t                noxtime_count;
-
-        int                    esomerr;
+        int                    gauge[MCNT_MAX];
+        int                    count[MCNT_MAX];
 
         xlator_specf_unwind_t  xl_specf_unwind;
         void                  *xl_local;
@@ -71,15 +129,6 @@ struct marker_str {
 
 typedef struct marker_str xl_marker_local_t;
 
-static inline gf_boolean_t
-marker_has_volinfo (xl_marker_local_t *marker)
-{
-       if (marker->volmark)
-                return _gf_true;
-       else
-                return _gf_false;
-}
-
 int32_t
 cluster_markerxtime_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                          int op_ret, int op_errno, dict_t *dict, dict_t *xdata);
@@ -93,12 +142,12 @@ cluster_getmarkerattr (call_frame_t *frame,xlator_t *this, loc_t *loc,
                        const char *name, void *xl_local,
                        xlator_specf_unwind_t xl_specf_getxattr_unwind,
                        xlator_t **sub_volumes, int count, int type,
-                       char *vol_uuid);
+                       int *gauge, char *vol_uuid);
 
 int
 match_uuid_local (const char *name, char *uuid);
 
-
-
+int
+gf_get_min_stime (xlator_t *this, dict_t *dst, char *key, data_t *value);
 
 #endif /* !_LIBXLATOR_H */
diff --git a/xlators/mgmt/glusterd/src/Makefile.am b/xlators/mgmt/glusterd/src/Makefile.am
index df15453dc..933c44019 100644
--- a/xlators/mgmt/glusterd/src/Makefile.am
+++ b/xlators/mgmt/glusterd/src/Makefile.am
@@ -11,17 +11,20 @@ glusterd_la_SOURCES = glusterd.c glusterd-handler.c glusterd-sm.c \
 	glusterd-volgen.c glusterd-rebalance.c glusterd-quota.c \
 	glusterd-geo-rep.c glusterd-replace-brick.c glusterd-log-ops.c \
 	glusterd-volume-ops.c glusterd-brick-ops.c glusterd-mountbroker.c \
-	glusterd-syncop.c glusterd-hooks.c glusterd-volume-set.c
+	glusterd-syncop.c glusterd-hooks.c glusterd-volume-set.c \
+        glusterd-locks.c glusterd-snapshot.c glusterd-mgmt-handler.c \
+        glusterd-mgmt.c
 
 glusterd_la_LIBADD = $(top_builddir)/libglusterfs/src/libglusterfs.la \
 		     $(top_builddir)/rpc/xdr/src/libgfxdr.la \
 		     $(top_builddir)/rpc/rpc-lib/src/libgfrpc.la \
-		     $(LIBXML2_LIBS) -lcrypto
+		     $(XML_LIBS) -lcrypto
 
 noinst_HEADERS = glusterd.h glusterd-utils.h glusterd-op-sm.h \
 	glusterd-sm.h glusterd-store.h glusterd-mem-types.h \
 	glusterd-pmap.h glusterd-volgen.h glusterd-mountbroker.h \
-	glusterd-syncop.h glusterd-hooks.h
+	glusterd-syncop.h glusterd-hooks.h glusterd-locks.h \
+	glusterd-mgmt.h
 
 AM_CPPFLAGS = $(GF_CPPFLAGS) -I$(top_srcdir)/libglusterfs/src \
 	-I$(rpclibdir) -I$(CONTRIBDIR)/rbtree \
@@ -29,7 +32,7 @@ AM_CPPFLAGS = $(GF_CPPFLAGS) -I$(top_srcdir)/libglusterfs/src \
 	-I$(CONTRIBDIR)/uuid \
 	-DSBIN_DIR=\"$(sbindir)\" -DDATADIR=\"$(localstatedir)\" \
 	-DGSYNCD_PREFIX=\"$(libexecdir)/glusterfs\"\
-        -DSYNCDAEMON_COMPILE=$(SYNCDAEMON_COMPILE) $(LIBXML2_CFLAGS)
+        -DSYNCDAEMON_COMPILE=$(SYNCDAEMON_COMPILE) $(XML_CPPFLAGS)
 
 AM_CFLAGS = -Wall $(GF_CFLAGS)
 
diff --git a/xlators/mgmt/glusterd/src/glusterd-brick-ops.c b/xlators/mgmt/glusterd/src/glusterd-brick-ops.c
index 2ac2699cf..596503c21 100644
--- a/xlators/mgmt/glusterd/src/glusterd-brick-ops.c
+++ b/xlators/mgmt/glusterd/src/glusterd-brick-ops.c
@@ -335,7 +335,7 @@ out:
 
 /* Handler functions */
 int
-glusterd_handle_add_brick (rpcsvc_request_t *req)
+__glusterd_handle_add_brick (rpcsvc_request_t *req)
 {
         int32_t                         ret = -1;
         gf_cli_req                      cli_req = {{0,}};
@@ -423,6 +423,10 @@ glusterd_handle_add_brick (rpcsvc_request_t *req)
                         stripe_count);
         }
 
+        if (!dict_get (dict, "force")) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to get flag");
+                goto out;
+        }
 
         ret = glusterd_volinfo_find (volname, &volinfo);
         if (ret) {
@@ -536,9 +540,80 @@ out:
         return ret;
 }
 
+int
+glusterd_handle_add_brick (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req, __glusterd_handle_add_brick);
+}
+
+static int
+subvol_matcher_init (int **subvols, int count)
+{
+        int ret = -1;
+
+        *subvols = GF_CALLOC (count, sizeof(int), gf_gld_mt_int);
+        if (*subvols)
+                ret = 0;
+
+        return ret;
+}
+
+static void
+subvol_matcher_update (int *subvols, glusterd_volinfo_t *volinfo,
+                       glusterd_brickinfo_t *brickinfo)
+{
+        glusterd_brickinfo_t *tmp        = NULL;
+        int32_t               sub_volume = 0;
+        int                   pos        = 0;
+
+        list_for_each_entry (tmp, &volinfo->bricks, brick_list) {
+
+                if (strcmp (tmp->hostname, brickinfo->hostname) ||
+                    strcmp (tmp->path, brickinfo->path)) {
+                        pos++;
+                        continue;
+                }
+                gf_log (THIS->name, GF_LOG_DEBUG, LOGSTR_FOUND_BRICK,
+                                        brickinfo->hostname, brickinfo->path,
+                                        volinfo->volname);
+                sub_volume = (pos / volinfo->dist_leaf_count);
+                subvols[sub_volume]++;
+                break;
+        }
+
+}
+
+static int
+subvol_matcher_verify (int *subvols, glusterd_volinfo_t *volinfo, char *err_str,
+                       size_t err_len, char *vol_type)
+{
+        int i = 0;
+        int ret = 0;
+
+       do {
+
+                if (subvols[i] % volinfo->dist_leaf_count == 0) {
+                        continue;
+                } else {
+                        ret = -1;
+                        snprintf (err_str, err_len,
+                                "Bricks not from same subvol for %s", vol_type);
+                        gf_log (THIS->name, GF_LOG_ERROR, "%s", err_str);
+                        break;
+                }
+        } while (++i < volinfo->subvol_count);
+
+        return ret;
+}
+
+static void
+subvol_matcher_destroy (int *subvols)
+{
+        GF_FREE (subvols);
+}
 
 int
-glusterd_handle_remove_brick (rpcsvc_request_t *req)
+__glusterd_handle_remove_brick (rpcsvc_request_t *req)
 {
         int32_t                   ret              = -1;
         gf_cli_req                cli_req          = {{0,}};
@@ -550,10 +625,7 @@ glusterd_handle_remove_brick (rpcsvc_request_t *req)
         int                       i                = 1;
         glusterd_volinfo_t       *volinfo          = NULL;
         glusterd_brickinfo_t     *brickinfo        = NULL;
-        int32_t                   pos              = 0;
-        int32_t                   sub_volume       = 0;
-        int32_t                   sub_volume_start = 0;
-        int32_t                   sub_volume_end   = 0;
+        int                      *subvols          = NULL;
         glusterd_brickinfo_t     *tmp              = NULL;
         char                      err_str[2048]    = {0};
         gf_cli_rsp                rsp              = {0,};
@@ -662,11 +734,11 @@ glusterd_handle_remove_brick (rpcsvc_request_t *req)
                 strcpy (vol_type, "distribute");
         }
 
-	/* Do not allow remove-brick if the volume is plain stripe */
+	/* Do not allow remove-brick if the volume is a stripe volume*/
 	if ((volinfo->type == GF_CLUSTER_TYPE_STRIPE) &&
             (volinfo->brick_count == volinfo->stripe_count)) {
                 snprintf (err_str, sizeof (err_str),
-                          "Removing brick from a plain stripe is not allowed");
+                          "Removing brick from a stripe volume is not allowed");
                 gf_log (this->name, GF_LOG_ERROR, "%s", err_str);
                 ret = -1;
                 goto out;
@@ -718,6 +790,14 @@ glusterd_handle_remove_brick (rpcsvc_request_t *req)
         }
 
         strcpy (brick_list, " ");
+
+        if ((volinfo->type != GF_CLUSTER_TYPE_NONE) &&
+            (volinfo->subvol_count > 1)) {
+                ret = subvol_matcher_init (&subvols, volinfo->subvol_count);
+                if (ret)
+                        goto out;
+        }
+
         while ( i <= count) {
                 snprintf (key, sizeof (key), "brick%d", i);
                 ret = dict_get_str (dict, key, &brick);
@@ -785,38 +865,18 @@ glusterd_handle_remove_brick (rpcsvc_request_t *req)
                         goto out;
                 }
 
-                pos = 0;
-                list_for_each_entry (tmp, &volinfo->bricks, brick_list) {
-
-                        if (strcmp (tmp->hostname,brickinfo->hostname) ||
-                            strcmp (tmp->path, brickinfo->path)) {
-                                pos++;
-                                continue;
-                        }
+                /* Find which subvolume the brick belongs to */
+                subvol_matcher_update (subvols, volinfo, brickinfo);
+        }
 
-                        gf_log (this->name, GF_LOG_DEBUG, LOGSTR_FOUND_BRICK,
-                                brickinfo->hostname, brickinfo->path,
-                                volinfo->volname);
-                        if (!sub_volume && (volinfo->dist_leaf_count > 1)) {
-                                sub_volume = (pos / volinfo->dist_leaf_count) + 1;
-                                sub_volume_start = (volinfo->dist_leaf_count *
-                                                    (sub_volume - 1));
-                                sub_volume_end = (volinfo->dist_leaf_count *
-                                                  sub_volume) - 1;
-                        } else {
-                                if (pos < sub_volume_start ||
-                                    pos >sub_volume_end) {
-                                        ret = -1;
-                                        snprintf (err_str, sizeof (err_str),
-                                                  "Bricks not from same subvol "
-                                                  "for %s", vol_type);
-                                        gf_log (this->name, GF_LOG_ERROR,
-                                                "%s", err_str);
-                                        goto out;
-                                }
-                        }
-                        break;
-                }
+        /* Check if the bricks belong to the same subvolumes.*/
+        if ((volinfo->type != GF_CLUSTER_TYPE_NONE) &&
+            (volinfo->subvol_count > 1)) {
+                ret = subvol_matcher_verify (subvols, volinfo,
+                                             err_str, sizeof(err_str),
+                                             vol_type);
+                if (ret)
+                        goto out;
         }
 
         ret = glusterd_op_begin_synctask (req, GD_OP_REMOVE_BRICK, dict);
@@ -839,11 +899,112 @@ out:
         }
 
         GF_FREE (brick_list);
+        subvol_matcher_destroy (subvols);
         free (cli_req.dict.dict_val); //its malloced by xdr
 
         return ret;
 }
 
+int
+glusterd_handle_remove_brick (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req,
+                                            __glusterd_handle_remove_brick);
+}
+
+static int
+_glusterd_restart_gsync_session (dict_t *this, char *key,
+                                 data_t *value, void *data)
+{
+        char                          *slave      = NULL;
+        char                          *slave_buf  = NULL;
+        char                          *path_list  = NULL;
+        char                          *slave_vol  = NULL;
+        char                          *slave_ip   = NULL;
+        char                          *conf_path  = NULL;
+        char                         **errmsg     = NULL;
+        int                            ret        = -1;
+        glusterd_gsync_status_temp_t  *param      = NULL;
+        gf_boolean_t                   is_running = _gf_false;
+
+        param = (glusterd_gsync_status_temp_t *)data;
+
+        GF_ASSERT (param);
+        GF_ASSERT (param->volinfo);
+
+        slave = strchr(value->data, ':');
+        if (slave) {
+                slave++;
+                slave_buf = gf_strdup (slave);
+                if (!slave_buf) {
+                        gf_log ("", GF_LOG_ERROR,
+                                "Failed to gf_strdup");
+                        ret = -1;
+                        goto out;
+                }
+        }
+        else
+                return 0;
+
+        ret = dict_set_dynstr (param->rsp_dict, "slave", slave_buf);
+        if (ret) {
+                gf_log ("", GF_LOG_ERROR,
+                        "Unable to store slave");
+                if (slave_buf)
+                        GF_FREE(slave_buf);
+                goto out;
+        }
+
+        ret = glusterd_get_slave_details_confpath (param->volinfo,
+                                                   param->rsp_dict,
+                                                   &slave_ip, &slave_vol,
+                                                   &conf_path, errmsg);
+        if (ret) {
+                if (*errmsg)
+                        gf_log ("", GF_LOG_ERROR, "%s", *errmsg);
+                else
+                        gf_log ("", GF_LOG_ERROR,
+                                "Unable to fetch slave or confpath details.");
+                goto out;
+        }
+
+        /* In cases that gsyncd is not running, we will not invoke it
+         * because of add-brick. */
+        ret = glusterd_check_gsync_running_local (param->volinfo->volname,
+                                                  slave, conf_path,
+                                                  &is_running);
+        if (ret) {
+                gf_log ("", GF_LOG_ERROR, "gsync running validation failed.");
+                goto out;
+        }
+        if (_gf_false == is_running) {
+                gf_log ("", GF_LOG_DEBUG, "gsync session for %s and %s is"
+                        " not running on this node. Hence not restarting.",
+                        param->volinfo->volname, slave);
+                ret = 0;
+                goto out;
+        }
+
+        ret = glusterd_get_local_brickpaths (param->volinfo, &path_list);
+        if (!path_list) {
+                gf_log ("", GF_LOG_DEBUG, "This node not being part of"
+                        " volume should not be running gsyncd. Hence"
+                        " no gsyncd process to restart.");
+                ret = 0;
+                goto out;
+        }
+
+        ret = glusterd_check_restart_gsync_session (param->volinfo, slave,
+                                                    param->rsp_dict, path_list,
+                                                    conf_path, 0);
+        if (ret)
+                gf_log ("", GF_LOG_ERROR,
+                        "Unable to restart gsync session.");
+
+out:
+        gf_log ("", GF_LOG_DEBUG, "Returning %d.", ret);
+        return ret;
+}
 
 /* op-sm */
 
@@ -851,17 +1012,21 @@ int
 glusterd_op_perform_add_bricks (glusterd_volinfo_t *volinfo, int32_t count,
                                 char  *bricks, dict_t *dict)
 {
-        glusterd_brickinfo_t *brickinfo     = NULL;
-        char                 *brick         = NULL;
-        int32_t               i             = 1;
-        char                 *brick_list    = NULL;
-        char                 *free_ptr1     = NULL;
-        char                 *free_ptr2     = NULL;
-        char                 *saveptr       = NULL;
-        int32_t               ret           = -1;
-        int32_t               stripe_count  = 0;
-        int32_t               replica_count = 0;
-        int32_t               type          = 0;
+        char                         *brick          = NULL;
+        int32_t                       i              = 1;
+        char                         *brick_list     = NULL;
+        char                         *free_ptr1      = NULL;
+        char                         *free_ptr2      = NULL;
+        char                         *saveptr        = NULL;
+        int32_t                       ret            = -1;
+        int32_t                       stripe_count   = 0;
+        int32_t                       replica_count  = 0;
+        int32_t                       type           = 0;
+        glusterd_brickinfo_t         *brickinfo      = NULL;
+        glusterd_gsync_status_temp_t  param          = {0, };
+        gf_boolean_t                  restart_needed = 0;
+        char                          msg[1024] __attribute__((unused)) = {0, };
+        int                           caps           = 0;
 
         GF_ASSERT (volinfo);
 
@@ -942,13 +1107,40 @@ glusterd_op_perform_add_bricks (glusterd_volinfo_t *volinfo, int32_t count,
 
         if (count)
                 brick = strtok_r (brick_list+1, " \n", &saveptr);
+#ifdef HAVE_BD_XLATOR
+        if (brickinfo->vg[0])
+                caps = CAPS_BD | CAPS_THIN |
+                        CAPS_OFFLOAD_COPY | CAPS_OFFLOAD_SNAPSHOT;
+#endif
 
         while (i <= count) {
-
                 ret = glusterd_volume_brickinfo_get_by_brick (brick, volinfo,
                                                               &brickinfo);
                 if (ret)
                         goto out;
+#ifdef HAVE_BD_XLATOR
+                /* Check for VG/thin pool if its BD volume */
+                if (brickinfo->vg[0]) {
+                        ret = glusterd_is_valid_vg (brickinfo, 0, msg);
+                        if (ret) {
+                                gf_log (THIS->name, GF_LOG_CRITICAL, "%s", msg);
+                                goto out;
+                        }
+                        /* if anyone of the brick does not have thin support,
+                           disable it for entire volume */
+                        caps &= brickinfo->caps;
+                } else
+                        caps = 0;
+#endif
+
+                if (uuid_is_null (brickinfo->uuid)) {
+                        ret = glusterd_resolve_brick (brickinfo);
+                        if (ret) {
+                                gf_log ("", GF_LOG_ERROR, FMTSTR_RESOLVE_BRICK,
+                                        brickinfo->hostname, brickinfo->path);
+                                goto out;
+                        }
+                }
 
                 ret = glusterd_brick_start (volinfo, brickinfo,
                                             _gf_true);
@@ -956,8 +1148,27 @@ glusterd_op_perform_add_bricks (glusterd_volinfo_t *volinfo, int32_t count,
                         goto out;
                 i++;
                 brick = strtok_r (NULL, " \n", &saveptr);
+
+                /* Check if the brick is added in this node, and set
+                 * the restart_needed flag. */
+                if ((!uuid_compare (brickinfo->uuid, MY_UUID)) &&
+                    !restart_needed) {
+                        restart_needed = 1;
+                        gf_log ("", GF_LOG_DEBUG,
+                                "Restart gsyncd session, if it's already "
+                                "running.");
+                }
         }
 
+        /* If the restart_needed flag is set, restart gsyncd sessions for that
+         * particular master with all the slaves. */
+        if (restart_needed) {
+                param.rsp_dict = dict;
+                param.volinfo = volinfo;
+                dict_foreach (volinfo->gsync_slaves,
+                              _glusterd_restart_gsync_session, &param);
+        }
+        volinfo->caps = caps;
 out:
         GF_FREE (free_ptr1);
         GF_FREE (free_ptr2);
@@ -1034,6 +1245,7 @@ glusterd_op_stage_add_brick (dict_t *dict, char **op_errstr)
         gf_boolean_t                            brick_alloc = _gf_false;
         char                                    *all_bricks = NULL;
         char                                    *str_ret = NULL;
+        gf_boolean_t                            is_force = _gf_false;
 
         priv = THIS->private;
         if (!priv)
@@ -1053,15 +1265,6 @@ glusterd_op_stage_add_brick (dict_t *dict, char **op_errstr)
                 goto out;
         }
 
-        if (volinfo->backend == GD_VOL_BK_BD) {
-                snprintf (msg, sizeof (msg), "Add brick is not supported for "
-                           "Block backend volume %s.", volname);
-                gf_log (THIS->name, GF_LOG_ERROR, "%s", msg);
-                *op_errstr = gf_strdup (msg);
-                ret = -1;
-                goto out;
-        }
-
         ret = glusterd_validate_volume_id (dict, volinfo);
         if (ret)
                 goto out;
@@ -1096,6 +1299,8 @@ glusterd_op_stage_add_brick (dict_t *dict, char **op_errstr)
                 goto out;
         }
 
+        is_force = dict_get_str_boolean (dict, "force", _gf_false);
+
         if (bricks) {
                 brick_list = gf_strdup (bricks);
                 all_bricks = gf_strdup (bricks);
@@ -1137,10 +1342,21 @@ glusterd_op_stage_add_brick (dict_t *dict, char **op_errstr)
                 }
 
                 if (!uuid_compare (brickinfo->uuid, MY_UUID)) {
-                        ret = glusterd_brick_create_path (brickinfo->hostname,
-                                                          brickinfo->path,
+#ifdef HAVE_BD_XLATOR
+                        if (brickinfo->vg[0]) {
+                                ret = glusterd_is_valid_vg (brickinfo, 1, msg);
+                                if (ret) {
+                                        gf_log (THIS->name, GF_LOG_ERROR, "%s",
+                                                msg);
+                                        *op_errstr = gf_strdup (msg);
+                                        goto out;
+                                }
+                        }
+#endif
+
+                        ret = glusterd_validate_and_create_brickpath (brickinfo,
                                                           volinfo->volume_id,
-                                                          op_errstr);
+                                                          op_errstr, is_force);
                         if (ret)
                                 goto out;
                 }
@@ -1227,6 +1443,16 @@ glusterd_op_stage_remove_brick (dict_t *dict, char **op_errstr)
 
         case GF_OP_CMD_START:
         {
+                if ((volinfo->type == GF_CLUSTER_TYPE_REPLICATE) &&
+                    dict_get (dict, "replica-count")) {
+                        snprintf (msg, sizeof(msg), "Migration of data is not "
+                                  "needed when reducing replica count. Use the"
+                                  " 'force' option");
+                        errstr = gf_strdup (msg);
+                        gf_log (this->name, GF_LOG_ERROR, "%s", errstr);
+                        goto out;
+                }
+
                 if (GLUSTERD_STATUS_STARTED != volinfo->status) {
                         snprintf (msg, sizeof (msg), "Volume %s needs to be "
                                   "started before remove-brick (you can use "
@@ -1236,6 +1462,17 @@ glusterd_op_stage_remove_brick (dict_t *dict, char **op_errstr)
                         gf_log (this->name, GF_LOG_ERROR, "%s", errstr);
                         goto out;
                 }
+                if (!gd_is_remove_brick_committed (volinfo)) {
+                        snprintf (msg, sizeof (msg), "An earlier remove-brick "
+                                  "task exists for volume %s. Either commit it"
+                                  " or stop it before starting a new task.",
+                                  volinfo->volname);
+                        errstr = gf_strdup (msg);
+                        gf_log (this->name, GF_LOG_ERROR, "Earlier remove-brick"
+                                " task exists for volume %s.",
+                                volinfo->volname);
+                        goto out;
+                }
                 if (glusterd_is_defrag_on(volinfo)) {
                         errstr = gf_strdup("Rebalance is in progress. Please "
                                            "retry after completion");
@@ -1243,7 +1480,7 @@ glusterd_op_stage_remove_brick (dict_t *dict, char **op_errstr)
                         goto out;
                 }
 
-                if (is_origin_glusterd ()) {
+                if (is_origin_glusterd (dict)) {
                         ret = glusterd_generate_and_set_task_id
                                 (dict, GF_REMOVE_BRICK_TID_KEY);
                         if (ret) {
@@ -1430,15 +1667,6 @@ glusterd_op_add_brick (dict_t *dict, char **op_errstr)
                 goto out;
         }
 
-        /* Need to reset the defrag/rebalance status accordingly */
-        switch (volinfo->rebal.defrag_status) {
-        case GF_DEFRAG_STATUS_FAILED:
-        case GF_DEFRAG_STATUS_COMPLETE:
-                volinfo->rebal.defrag_status = 0;
-        default:
-                break;
-        }
-
         ret = glusterd_store_volinfo (volinfo, GLUSTERD_VOLINFO_VER_AC_INCREMENT);
         if (ret)
                 goto out;
@@ -1470,6 +1698,8 @@ glusterd_op_remove_brick (dict_t *dict, char **op_errstr)
         glusterd_brickinfo_t    *tmp           = NULL;
         char                    *task_id_str   = NULL;
         xlator_t                *this          = NULL;
+        dict_t                  *bricks_dict   = NULL;
+        char                    *brick_tmpstr  = NULL;
 
         this = THIS;
         GF_ASSERT (this);
@@ -1497,7 +1727,7 @@ glusterd_op_remove_brick (dict_t *dict, char **op_errstr)
         /* Set task-id, if available, in ctx dict for operations other than
          * start
          */
-        if (is_origin_glusterd () && (cmd != GF_OP_CMD_START)) {
+        if (is_origin_glusterd (dict) && (cmd != GF_OP_CMD_START)) {
                 if (!uuid_is_null (volinfo->rebal.rebalance_id)) {
                         ret = glusterd_copy_uuid_to_dict
                                 (volinfo->rebal.rebalance_id, dict,
@@ -1510,9 +1740,14 @@ glusterd_op_remove_brick (dict_t *dict, char **op_errstr)
                 }
         }
 
-        /* Clear task-id on commmitting/stopping of remove-brick operation */
-        if ((cmd != GF_OP_CMD_START) || (cmd != GF_OP_CMD_STATUS))
+        /* Clear task-id, rebal.op and stored bricks on commmitting/stopping
+         * remove-brick */
+        if ((cmd != GF_OP_CMD_START) || (cmd != GF_OP_CMD_STATUS)) {
                 uuid_clear (volinfo->rebal.rebalance_id);
+                volinfo->rebal.op = GD_OP_NONE;
+                dict_unref (volinfo->rebal.dict);
+                volinfo->rebal.dict = NULL;
+        }
 
         ret = -1;
         switch (cmd) {
@@ -1559,6 +1794,7 @@ glusterd_op_remove_brick (dict_t *dict, char **op_errstr)
                         ret = 0;
                 } else {
                         uuid_parse (task_id_str, volinfo->rebal.rebalance_id) ;
+                        volinfo->rebal.op = GD_OP_REMOVE_BRICK;
                 }
                 force = 0;
                 break;
@@ -1595,7 +1831,20 @@ glusterd_op_remove_brick (dict_t *dict, char **op_errstr)
                 goto out;
         }
 
-
+        /* Save the list of bricks for later usage. Right now this is required
+         * for displaying the task parameters with task status in volume status.
+         */
+        bricks_dict = dict_new ();
+        if (!bricks_dict) {
+                ret = -1;
+                goto out;
+        }
+        ret = dict_set_int32 (bricks_dict, "count", count);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Failed to save remove-brick count");
+                goto out;
+        }
         while ( i <= count) {
                 snprintf (key, 256, "brick%d", i);
                 ret = dict_get_str (dict, key, &brick);
@@ -1605,6 +1854,21 @@ glusterd_op_remove_brick (dict_t *dict, char **op_errstr)
                         goto out;
                 }
 
+                brick_tmpstr = gf_strdup (brick);
+                if (!brick_tmpstr) {
+                        ret = -1;
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Failed to duplicate brick name");
+                        goto out;
+                }
+                ret = dict_set_dynstr (bricks_dict, key, brick_tmpstr);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Failed to add brick to dict");
+                        goto out;
+                }
+                brick_tmpstr = NULL;
+
                 ret = glusterd_op_perform_remove_brick (volinfo, brick, force,
                                                         &need_rebalance);
                 if (ret)
@@ -1618,6 +1882,7 @@ glusterd_op_remove_brick (dict_t *dict, char **op_errstr)
                         volinfo->replica_count, replica_count,
                         volinfo->volname);
                 volinfo->replica_count = replica_count;
+                volinfo->sub_count = replica_count;
                 volinfo->dist_leaf_count = glusterd_get_dist_leaf_count (volinfo);
                 volinfo->subvol_count = (volinfo->brick_count /
                                          volinfo->dist_leaf_count);
@@ -1634,6 +1899,8 @@ glusterd_op_remove_brick (dict_t *dict, char **op_errstr)
                         }
                 }
         }
+        volinfo->rebal.dict = bricks_dict;
+        bricks_dict = NULL;
 
         ret = glusterd_create_volfiles_and_notify_services (volinfo);
         if (ret) {
@@ -1678,5 +1945,9 @@ out:
         if (ret && err_str[0] && op_errstr)
                 *op_errstr = gf_strdup (err_str);
 
+        GF_FREE (brick_tmpstr);
+        if (bricks_dict)
+                dict_unref (bricks_dict);
+
         return ret;
 }
diff --git a/xlators/mgmt/glusterd/src/glusterd-geo-rep.c b/xlators/mgmt/glusterd/src/glusterd-geo-rep.c
index 758ab1a14..5786694bd 100644
--- a/xlators/mgmt/glusterd/src/glusterd-geo-rep.c
+++ b/xlators/mgmt/glusterd/src/glusterd-geo-rep.c
@@ -25,18 +25,199 @@
 
 #include <signal.h>
 
+static int
+dict_get_param (dict_t *dict, char *key, char **param);
+
+static int
+glusterd_get_statefile_name (glusterd_volinfo_t *volinfo, char *slave,
+                             char *conf_path, char **statefile);
+
+static int
+glusterd_get_slave_info (char *slave, char **slave_ip,
+                         char **slave_vol, char **op_errstr);
+
+static int
+glusterd_gsync_read_frm_status (char *path, char *buf, size_t blen);
+
+struct gsync_config_opt_vals_ gsync_confopt_vals[] = {
+        {.op_name        = "change_detector",
+         .no_of_pos_vals = 2,
+         .case_sensitive = _gf_true,
+         .values         = {"xsync", "changelog"},
+        },
+        {.op_name        = "special_sync_mode",
+         .no_of_pos_vals = 2,
+         .case_sensitive = _gf_true,
+         .values         = {"partial", "recover"}
+        },
+        {.op_name        = "log-level",
+         .no_of_pos_vals = 5,
+         .case_sensitive = _gf_false,
+         .values         = {"critical", "error", "warning", "info", "debug"}
+        },
+        {.op_name = NULL,
+        },
+};
+
 static char *gsync_reserved_opts[] = {
         "gluster-command-dir",
         "pid-file",
+        "remote-gsyncd"
         "state-file",
         "session-owner",
         "state-socket-unencoded",
         "socketdir",
+        "ignore-deletes",
+        "local-id",
+        "local-path",
+        "slave-id",
         NULL
 };
 
 int
-glusterd_handle_gsync_set (rpcsvc_request_t *req)
+__glusterd_handle_sys_exec (rpcsvc_request_t *req)
+{
+        int32_t                 ret     = 0;
+        dict_t                  *dict   = NULL;
+        gf_cli_req              cli_req = {{0},};
+        glusterd_op_t           cli_op = GD_OP_SYS_EXEC;
+        glusterd_conf_t         *priv   = NULL;
+        char                    *host_uuid = NULL;
+        char                    err_str[2048] = {0,};
+        xlator_t                *this = NULL;
+
+        GF_ASSERT (req);
+
+        this = THIS;
+        GF_ASSERT (this);
+        priv = this->private;
+        GF_ASSERT (priv);
+
+        ret = xdr_to_generic (req->msg[0], &cli_req,
+                              (xdrproc_t)xdr_gf_cli_req);
+        if (ret < 0) {
+                req->rpc_err = GARBAGE_ARGS;
+                goto out;
+        }
+
+        if (cli_req.dict.dict_len) {
+                dict = dict_new ();
+                if (!dict)
+                        goto out;
+
+
+                ret = dict_unserialize (cli_req.dict.dict_val,
+                                        cli_req.dict.dict_len,
+                                        &dict);
+                if (ret < 0) {
+                        gf_log (this->name, GF_LOG_ERROR, "failed to "
+                                "unserialize req-buffer to dictionary");
+                        snprintf (err_str, sizeof (err_str), "Unable to decode "
+                                  "the command");
+                        goto out;
+               } else {
+                        dict->extra_stdfree = cli_req.dict.dict_val;
+                }
+
+                host_uuid = gf_strdup (uuid_utoa(MY_UUID));
+                if (host_uuid == NULL) {
+                        snprintf (err_str, sizeof (err_str), "Failed to get "
+                                  "the uuid of local glusterd");
+                        ret = -1;
+                        goto out;
+                }
+
+                ret = dict_set_dynstr (dict, "host-uuid", host_uuid);
+                if (ret)
+                        goto out;
+        }
+
+        ret = glusterd_op_begin_synctask (req, cli_op, dict);
+
+out:
+        if (ret) {
+                if (err_str[0] == '\0')
+                        snprintf (err_str, sizeof (err_str),
+                                  "Operation failed");
+                ret = glusterd_op_send_cli_response (cli_op, ret, 0, req,
+                                                     dict, err_str);
+        }
+        return ret;
+}
+
+int
+__glusterd_handle_copy_file (rpcsvc_request_t *req)
+{
+        int32_t                 ret     = 0;
+        dict_t                  *dict   = NULL;
+        gf_cli_req              cli_req = {{0},};
+        glusterd_op_t           cli_op = GD_OP_COPY_FILE;
+        glusterd_conf_t         *priv   = NULL;
+        char                    *host_uuid = NULL;
+        char                    err_str[2048] = {0,};
+        xlator_t                *this = NULL;
+
+        GF_ASSERT (req);
+
+        this = THIS;
+        GF_ASSERT (this);
+        priv = this->private;
+        GF_ASSERT (priv);
+
+        ret = xdr_to_generic (req->msg[0], &cli_req,
+                              (xdrproc_t)xdr_gf_cli_req);
+        if (ret < 0) {
+                req->rpc_err = GARBAGE_ARGS;
+                goto out;
+        }
+
+        if (cli_req.dict.dict_len) {
+                dict = dict_new ();
+                if (!dict)
+                        goto out;
+
+
+                ret = dict_unserialize (cli_req.dict.dict_val,
+                                        cli_req.dict.dict_len,
+                                        &dict);
+                if (ret < 0) {
+                        gf_log (this->name, GF_LOG_ERROR, "failed to "
+                                "unserialize req-buffer to dictionary");
+                        snprintf (err_str, sizeof (err_str), "Unable to decode "
+                                  "the command");
+                        goto out;
+               } else {
+                        dict->extra_stdfree = cli_req.dict.dict_val;
+                }
+
+                host_uuid = gf_strdup (uuid_utoa(MY_UUID));
+                if (host_uuid == NULL) {
+                        snprintf (err_str, sizeof (err_str), "Failed to get "
+                                  "the uuid of local glusterd");
+                        ret = -1;
+                        goto out;
+                }
+
+                ret = dict_set_dynstr (dict, "host-uuid", host_uuid);
+                if (ret)
+                        goto out;
+        }
+
+        ret = glusterd_op_begin_synctask (req, cli_op, dict);
+
+out:
+        if (ret) {
+                if (err_str[0] == '\0')
+                        snprintf (err_str, sizeof (err_str),
+                                  "Operation failed");
+                ret = glusterd_op_send_cli_response (cli_op, ret, 0, req,
+                                                     dict, err_str);
+        }
+        return ret;
+}
+
+int
+__glusterd_handle_gsync_set (rpcsvc_request_t *req)
 {
         int32_t                 ret     = 0;
         dict_t                  *dict   = NULL;
@@ -99,13 +280,13 @@ glusterd_handle_gsync_set (rpcsvc_request_t *req)
         ret = dict_get_str (dict, "master", &master);
         if (ret < 0) {
                 gf_log (this->name, GF_LOG_INFO, "master not found, while "
-                        "handling"GEOREP" options");
+                        "handling "GEOREP" options");
                 master = "(No Master)";
         }
 
         ret = dict_get_str (dict, "slave", &slave);
         if (ret < 0) {
-                gf_log (this->name, GF_LOG_INFO, "slave not not found, while"
+                gf_log (this->name, GF_LOG_INFO, "slave not found, while "
                         "handling "GEOREP" options");
                 slave = "(No Slave)";
         }
@@ -119,6 +300,10 @@ glusterd_handle_gsync_set (rpcsvc_request_t *req)
         }
 
         switch (type) {
+        case GF_GSYNC_OPTION_TYPE_CREATE:
+                strncpy (operation, "create", sizeof (operation));
+                cli_op = GD_OP_GSYNC_CREATE;
+                break;
 
         case GF_GSYNC_OPTION_TYPE_START:
                 strncpy (operation, "start", sizeof (operation));
@@ -135,12 +320,9 @@ glusterd_handle_gsync_set (rpcsvc_request_t *req)
         case GF_GSYNC_OPTION_TYPE_STATUS:
                 strncpy (operation, "status", sizeof (operation));
                 break;
-        case GF_GSYNC_OPTION_TYPE_ROTATE:
-                strncpy (operation, "rotate", sizeof(operation));
-                break;
         }
 
-        ret = glusterd_op_begin_synctask (req, GD_OP_GSYNC_SET, dict);
+        ret = glusterd_op_begin_synctask (req, cli_op, dict);
 
 out:
         if (ret) {
@@ -153,6 +335,23 @@ out:
         return ret;
 }
 
+int
+glusterd_handle_sys_exec (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req, __glusterd_handle_sys_exec);
+}
+
+int
+glusterd_handle_copy_file (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req, __glusterd_handle_copy_file);
+}
+
+int
+glusterd_handle_gsync_set (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req, __glusterd_handle_gsync_set);
+}
 
 /*****
  *
@@ -437,7 +636,7 @@ _fcbk_conftodict (char *resbuf, size_t blen, FILE *fp, void *data)
 }
 
 static int
-glusterd_gsync_get_config (char *master, char *slave, char *gl_workdir, dict_t *dict)
+glusterd_gsync_get_config (char *master, char *slave, char *conf_path, dict_t *dict)
 {
         /* key + value, where value must be able to accommodate a path */
         char resbuf[256 + PATH_MAX] = {0,};
@@ -445,7 +644,7 @@ glusterd_gsync_get_config (char *master, char *slave, char *gl_workdir, dict_t *
 
         runinit (&runner);
         runner_add_args  (&runner, GSYNCD_PREFIX"/gsyncd", "-c", NULL);
-        runner_argprintf (&runner, "%s/"GSYNC_CONF, gl_workdir);
+        runner_argprintf (&runner, "%s", conf_path);
         runner_argprintf (&runner, ":%s", master);
         runner_add_args  (&runner, slave, "--config-get-all", NULL);
 
@@ -455,13 +654,13 @@ glusterd_gsync_get_config (char *master, char *slave, char *gl_workdir, dict_t *
 
 static int
 glusterd_gsync_get_param_file (char *prmfile, const char *param, char *master,
-                               char *slave, char *gl_workdir)
+                               char *slave, char *conf_path)
 {
         runner_t            runner = {0,};
 
         runinit (&runner);
         runner_add_args  (&runner, GSYNCD_PREFIX"/gsyncd", "-c", NULL);
-        runner_argprintf (&runner, "%s/"GSYNC_CONF, gl_workdir);
+        runner_argprintf (&runner, "%s", conf_path);
         runner_argprintf (&runner, ":%s", master);
         runner_add_args  (&runner, slave, "--config-get", NULL);
         runner_argprintf (&runner, "%s-file", param);
@@ -470,83 +669,14 @@ glusterd_gsync_get_param_file (char *prmfile, const char *param, char *master,
 }
 
 static int
-glusterd_gsync_get_session_owner (char *master, char *slave, char *session_owner,
-                                  char *gl_workdir)
-{
-        runner_t runner = {0,};
-
-        runinit(&runner);
-        runner_add_args  (&runner, GSYNCD_PREFIX"/gsyncd", "-c", NULL);
-        runner_argprintf (&runner, "%s/"GSYNC_CONF, gl_workdir);
-        runner_argprintf (&runner, ":%s", master);
-        runner_add_args  (&runner, slave, "--config-get", "session-owner",
-                          NULL);
-
-        return glusterd_query_extutil (session_owner, &runner);
-}
-
-/* check whether @slave is local or remote. normalized
- * urls starting with ssh are considered to be remote
- * @returns
- *    1 if slave is remote
- *    0 is slave is local
- */
-static int
-glusterd_gsync_slave_is_remote (char *slave)
-{
-        int   ret     = 0;
-        char *ssh_pos = NULL;
-
-        ssh_pos = strstr(slave, "ssh://");
-        if ( ssh_pos && ((ssh_pos - slave) == 0) )
-                ret = 1;
-
-        return ret;
-}
-
-static int
-glusterd_gsync_get_slave_log_file (char *master, char *slave, char *log_file)
-{
-        int              ret        = -1;
-        runner_t         runner     = {0,};
-        char uuid_str[64]           = {0,};
-        glusterd_conf_t *priv       = NULL;
-        char            *gl_workdir = NULL;
-
-        GF_ASSERT(THIS);
-        GF_ASSERT(THIS->private);
-
-        priv = THIS->private;
-
-        GF_VALIDATE_OR_GOTO("gsyncd", master, out);
-        GF_VALIDATE_OR_GOTO("gsyncd", slave, out);
-
-        gl_workdir = priv->workdir;
-
-        /* get the session owner for the master-slave session */
-        ret = glusterd_gsync_get_session_owner (master, slave, uuid_str,
-                                                gl_workdir);
-        if (ret)
-                goto out;
-
-        /* get the log file for the slave */
-        runinit(&runner);
-        runner_add_args  (&runner, GSYNCD_PREFIX"/gsyncd", "-c", NULL);
-        runner_argprintf (&runner, "%s/"GSYNC_CONF, gl_workdir);
-        runner_argprintf (&runner, "--session-owner=%s", uuid_str);
-        runner_add_args  (&runner, slave, "--config-get", "log-file", NULL);
-
-        ret = glusterd_query_extutil (log_file, &runner);
-
- out:
-        return ret;
-}
-
-static int
-gsyncd_getpidfile (char *master, char *slave, char *pidfile)
+gsyncd_getpidfile (char *master, char *slave, char *pidfile, char *conf_path)
 {
         int                ret             = -1;
         glusterd_conf_t    *priv  = NULL;
+        char               *confpath = NULL;
+        char                conf_buf[PATH_MAX] = "";
+        struct stat         stbuf = {0,};
+
 
         GF_ASSERT (THIS);
         GF_ASSERT (THIS->private);
@@ -556,8 +686,22 @@ gsyncd_getpidfile (char *master, char *slave, char *pidfile)
         GF_VALIDATE_OR_GOTO ("gsync", master, out);
         GF_VALIDATE_OR_GOTO ("gsync", slave, out);
 
+        ret = lstat (conf_path, &stbuf);
+        if (!ret) {
+                gf_log ("", GF_LOG_DEBUG, "Using passed config template(%s).",
+                        conf_path);
+                confpath = conf_path;
+        } else {
+                ret = snprintf (conf_buf, sizeof(conf_buf) - 1,
+                                "%s/"GSYNC_CONF_TEMPLATE, priv->workdir);
+                conf_buf[ret] = '\0';
+                confpath = conf_buf;
+                gf_log ("", GF_LOG_DEBUG, "Using default config template(%s).",
+                        confpath);
+        }
+
         ret = glusterd_gsync_get_param_file (pidfile, "pid", master,
-                                              slave, priv->workdir);
+                                              slave, confpath);
         if (ret == -1) {
                 ret = -2;
                 gf_log ("", GF_LOG_WARNING, "failed to create the pidfile string");
@@ -571,32 +715,6 @@ gsyncd_getpidfile (char *master, char *slave, char *pidfile)
 }
 
 static int
-glusterd_gsyncd_getlogfile (char *master, char *slave, char *log_file)
-{
-        int                ret             = -1;
-        glusterd_conf_t    *priv  = NULL;
-
-        GF_ASSERT (THIS);
-        GF_ASSERT (THIS->private);
-
-        priv = THIS->private;
-
-        GF_VALIDATE_OR_GOTO ("gsync", master, out);
-        GF_VALIDATE_OR_GOTO ("gsync", slave, out);
-
-        ret = glusterd_gsync_get_param_file (log_file, "log", master,
-                                              slave, priv->workdir);
-        if (ret == -1) {
-                ret = -2;
-                gf_log ("", GF_LOG_WARNING, "failed to gsyncd logfile");
-                goto out;
-        }
-
- out:
-        return ret;
-}
-
-static int
 gsync_status_byfd (int fd)
 {
         GF_ASSERT (fd >= -1);
@@ -613,12 +731,12 @@ gsync_status_byfd (int fd)
  * return -1 when not running
  */
 int
-gsync_status (char *master, char *slave, int *status)
+gsync_status (char *master, char *slave, char *conf_path, int *status)
 {
         char pidfile[PATH_MAX] = {0,};
         int  fd                = -1;
 
-        fd = gsyncd_getpidfile (master, slave, pidfile);
+        fd = gsyncd_getpidfile (master, slave, pidfile, conf_path);
         if (fd == -2)
                 return -1;
 
@@ -655,16 +773,48 @@ out:
 }
 
 static int
-gsync_verify_config_options (dict_t *dict, char **op_errstr)
+glusterd_verify_gsyncd_spawn (char *master, char *slave)
 {
-        char  **resopt    = NULL;
-        int     i         = 0;
-        char   *subop     = NULL;
-        char   *slave     = NULL;
-        char   *op_name   = NULL;
-        char   *op_value  = NULL;
-        char   *t         = NULL;
-        gf_boolean_t banned = _gf_true;
+        int                 ret = 0;
+        runner_t            runner = {0,};
+
+        runinit (&runner);
+        runner_add_args (&runner, GSYNCD_PREFIX"/gsyncd",
+                         "--verify", "spawning", NULL);
+        runner_argprintf (&runner, ":%s", master);
+        runner_add_args  (&runner, slave, NULL);
+        runner_redir (&runner, STDOUT_FILENO, RUN_PIPE);
+        ret = runner_start (&runner);
+        if (ret) {
+                gf_log ("", GF_LOG_ERROR, "spawning child failed");
+                ret = -1;
+                goto out;
+        }
+
+        if (runner_end (&runner) != 0)
+                ret = -1;
+
+out:
+        gf_log ("", GF_LOG_DEBUG, "returning %d", ret);
+        return ret;
+}
+
+static int
+gsync_verify_config_options (dict_t *dict, char **op_errstr, char *volname)
+{
+        char                         **resopt           = NULL;
+        int                            i                = 0;
+        int                            ret              = -1;
+        char                          *subop            = NULL;
+        char                          *slave            = NULL;
+        char                          *op_name          = NULL;
+        char                          *op_value         = NULL;
+        char                          *t                = NULL;
+        char                           errmsg[PATH_MAX] = "";
+        gf_boolean_t                   banned           = _gf_true;
+        gf_boolean_t                   op_match         = _gf_true;
+        gf_boolean_t                   val_match        = _gf_true;
+        struct gsync_config_opt_vals_ *conf_vals        = NULL;
 
         if (dict_get_str (dict, "subop", &subop) != 0) {
                 gf_log ("", GF_LOG_WARNING, "missing subop");
@@ -688,6 +838,12 @@ gsync_verify_config_options (dict_t *dict, char **op_errstr)
         }
 
         if (runcmd (GSYNCD_PREFIX"/gsyncd", "--config-check", op_name, NULL)) {
+                ret = glusterd_verify_gsyncd_spawn (volname, slave);
+                if (ret) {
+                        gf_log ("", GF_LOG_ERROR, "Unable to spawn gsyncd");
+                        return 0;
+                }
+
                 gf_log ("", GF_LOG_WARNING, "Invalid option %s", op_name);
                 *op_errstr = gf_strdup ("Invalid option");
 
@@ -732,35 +888,109 @@ gsync_verify_config_options (dict_t *dict, char **op_errstr)
                 }
         }
 
+        /* Check options in gsync_confopt_vals for invalid values */
+        for (conf_vals = gsync_confopt_vals; conf_vals->op_name; conf_vals++) {
+                op_match = _gf_true;
+                for (i = 0; conf_vals->op_name[i] && op_name[i]; i++) {
+                        if (conf_vals->op_name[i] == op_name[i] ||
+                            (conf_vals->op_name[i] == '_' && op_name[i] == '-'))
+                                continue;
+                        op_match = _gf_false;
+                }
+
+                if (op_match) {
+                        val_match = _gf_false;
+                        for (i = 0; i < conf_vals->no_of_pos_vals; i++) {
+                                if(conf_vals->case_sensitive){
+                                        if (!strcmp (conf_vals->values[i], op_value))
+                                                val_match = _gf_true;
+                                } else {
+                                        if (!strcasecmp (conf_vals->values[i], op_value))
+                                                val_match = _gf_true;
+                                }
+                        }
+
+                        if (!val_match) {
+                                ret = snprintf (errmsg, sizeof(errmsg) - 1,
+                                                "Invalid values (%s) for"
+                                                " option %s", op_value,
+                                                op_name);
+                                errmsg[ret] = '\0';
+
+                                gf_log ("", GF_LOG_ERROR, "%s", errmsg);
+                                *op_errstr = gf_strdup (errmsg);
+                                return -1;
+                        }
+                }
+        }
+
         return 0;
 }
 
 static int
 glusterd_get_gsync_status_mst_slv (glusterd_volinfo_t *volinfo,
-                                   char *slave, dict_t *rsp_dict, char *node);
+                                   char *slave, char *conf_path,
+                                   dict_t *rsp_dict, char *node);
 
 static int
 _get_status_mst_slv (dict_t *this, char *key, data_t *value, void *data)
 {
         glusterd_gsync_status_temp_t  *param = NULL;
         char                          *slave = NULL;
-        int                           ret = 0;
+        char                          *slave_buf = NULL;
+        char                          *slave_ip  = NULL;
+        char                          *slave_vol = NULL;
+        char                          *errmsg    = NULL;
+        char                           conf_path[PATH_MAX] = "";
+        int                           ret = -1;
+        glusterd_conf_t              *priv = NULL;
 
         param = (glusterd_gsync_status_temp_t *)data;
 
         GF_ASSERT (param);
         GF_ASSERT (param->volinfo);
 
+        if (THIS)
+                priv = THIS->private;
+        if (priv == NULL) {
+                gf_log ("", GF_LOG_ERROR, "priv of glusterd not present");
+                goto out;
+        }
+
         slave = strchr(value->data, ':');
-        if (slave)
-                slave ++;
-        else
+        if (!slave)
                 return 0;
+        slave++;
+
+        ret = glusterd_get_slave_info (slave, &slave_ip, &slave_vol, &errmsg);
+        if (ret) {
+                if (errmsg)
+                        gf_log ("", GF_LOG_ERROR, "Unable to fetch "
+                                "slave details. Error: %s", errmsg);
+                else
+                        gf_log ("", GF_LOG_ERROR,
+                                "Unable to fetch slave details.");
+                ret = -1;
+                goto out;
+        }
+
+        ret = snprintf (conf_path, sizeof(conf_path) - 1,
+                        "%s/"GEOREP"/%s_%s_%s/gsyncd.conf",
+                        priv->workdir, param->volinfo->volname,
+                        slave_ip, slave_vol);
+        conf_path[ret] = '\0';
 
         ret = glusterd_get_gsync_status_mst_slv(param->volinfo,
-                                                slave, param->rsp_dict,
+                                                slave, conf_path,
+                                                param->rsp_dict,
                                                 param->node);
-        return 0;
+out:
+
+        if (slave_buf)
+                GF_FREE(slave_buf);
+
+        gf_log ("", GF_LOG_DEBUG, "Returning %d.", ret);
+        return ret;
 }
 
 
@@ -781,19 +1011,22 @@ static int
 glusterd_remove_slave_in_info (glusterd_volinfo_t *volinfo, char *slave,
                                char **op_errstr)
 {
+        int   zero_slave_entries = _gf_true;
         int   ret = 0;
         char *slavekey = NULL;
 
         GF_ASSERT (volinfo);
         GF_ASSERT (slave);
 
-        ret = glusterd_get_slave (volinfo, slave, &slavekey);
-        if (ret < 0) {
-                ret++;
-                goto out;
-        }
-
-        dict_del (volinfo->gsync_slaves, slavekey);
+        do {
+                ret = glusterd_get_slave (volinfo, slave, &slavekey);
+                if (ret < 0 && zero_slave_entries) {
+                        ret++;
+                        goto out;
+                }
+                zero_slave_entries = _gf_false;
+                dict_del (volinfo->gsync_slaves, slavekey);
+        } while (ret >= 0);
 
         ret = glusterd_store_volinfo (volinfo,
                                       GLUSTERD_VOLINFO_VER_AC_INCREMENT);
@@ -846,8 +1079,9 @@ glusterd_gsync_get_uuid (char *slave, glusterd_volinfo_t *vol,
         return ret;
 }
 
-static int
+int
 glusterd_check_gsync_running_local (char *master, char *slave,
+                                    char *conf_path,
                                     gf_boolean_t *is_run)
 {
         int                 ret    = -1;
@@ -858,7 +1092,7 @@ glusterd_check_gsync_running_local (char *master, char *slave,
         GF_ASSERT (is_run);
 
         *is_run = _gf_false;
-        ret = gsync_status (master, slave, &ret_status);
+        ret = gsync_status (master, slave, conf_path, &ret_status);
         if (ret == 0 && ret_status == 0) {
                 *is_run = _gf_true;
         } else if (ret == -1) {
@@ -875,7 +1109,8 @@ glusterd_check_gsync_running_local (char *master, char *slave,
 
 static int
 glusterd_store_slave_in_info (glusterd_volinfo_t *volinfo, char *slave,
-                              char *host_uuid, char **op_errstr)
+                              char *host_uuid, char **op_errstr,
+                              gf_boolean_t is_force)
 {
         int    ret = 0;
         int    maxslv = 0;
@@ -898,7 +1133,8 @@ glusterd_store_slave_in_info (glusterd_volinfo_t *volinfo, char *slave,
         case -1:
                                 break;
         default:
-                GF_ASSERT (ret > 0);
+                if (!is_force)
+                        GF_ASSERT (ret > 0);
                 ret = dict_get_str (volinfo->gsync_slaves, slavekey, &slaveentry);
                 GF_ASSERT (ret == 0);
 
@@ -907,13 +1143,23 @@ glusterd_store_slave_in_info (glusterd_volinfo_t *volinfo, char *slave,
                  * assert an uuid mismatch
                  */
                 t = strtail (slaveentry, host_uuid);
-                GF_ASSERT (!t || *t != ':');
+                if (!is_force)
+                        GF_ASSERT (!t || *t != ':');
+
+                if (is_force) {
+                        gf_log ("", GF_LOG_DEBUG, GEOREP" has already been "
+                                "invoked for the %s (master) and %s (slave)."
+                                " Allowing without saving info again due to"
+                                " force command.", volinfo->volname, slave);
+                        ret = 0;
+                        goto out;
+                }
 
                 gf_log ("", GF_LOG_ERROR, GEOREP" has already been invoked for "
                                           "the %s (master) and %s (slave) "
                                           "from a different machine",
                                            volinfo->volname, slave);
-                *op_errstr = gf_strdup (GEOREP" already running in an an"
+                *op_errstr = gf_strdup (GEOREP" already running in "
                                         "another machine");
                 ret = -1;
                 goto out;
@@ -946,23 +1192,26 @@ glusterd_store_slave_in_info (glusterd_volinfo_t *volinfo, char *slave,
         return ret;
 }
 
-
 static int
 glusterd_op_verify_gsync_start_options (glusterd_volinfo_t *volinfo,
-                                        char *slave, char **op_errstr)
+                                        char *slave, char *conf_path,
+                                        char *statefile, char **op_errstr,
+                                        gf_boolean_t is_force)
 {
         int                     ret = -1;
         gf_boolean_t            is_running = _gf_false;
         char                    msg[2048] = {0};
         uuid_t                  uuid = {0};
-        glusterd_conf_t         *priv = NULL;
-        xlator_t                *this = NULL;
+        glusterd_conf_t        *priv = NULL;
+        xlator_t               *this = NULL;
+        struct stat             stbuf = {0,};
 
         this = THIS;
 
         GF_ASSERT (volinfo);
         GF_ASSERT (slave);
         GF_ASSERT (op_errstr);
+        GF_ASSERT (conf_path);
         GF_ASSERT (this && this->private);
 
         priv  = this->private;
@@ -972,26 +1221,56 @@ glusterd_op_verify_gsync_start_options (glusterd_volinfo_t *volinfo,
                           "before "GEOREP" start", volinfo->volname);
                 goto out;
         }
+
+        ret = lstat (statefile, &stbuf);
+        if (ret) {
+                snprintf (msg, sizeof (msg), "Session between %s and %s has"
+                          " not been created. Please create session and retry.",
+                          volinfo->volname, slave);
+                gf_log ("", GF_LOG_ERROR, "%s", msg);
+                *op_errstr = gf_strdup (msg);
+                goto out;
+        }
+
+        /* Check if the gsync slave info is stored. If not
+         * session has not been created */
+        ret = glusterd_gsync_get_uuid (slave, volinfo, uuid);
+        if (ret) {
+                snprintf (msg, sizeof (msg), "Session between %s and %s has"
+                          " not been created. Please create session and retry.",
+                          volinfo->volname, slave);
+                gf_log ("", GF_LOG_ERROR, "%s", msg);
+                goto out;
+        }
+
+        if (is_force) {
+                ret = 0;
+                goto out;
+        }
+
         /*Check if the gsync is already started in cmd. inited host
          * If so initiate add it into the glusterd's priv*/
-        ret = glusterd_gsync_get_uuid (slave, volinfo, uuid);
-        if ((ret == 0) && (uuid_compare (MY_UUID, uuid) == 0)) {
-                ret = glusterd_check_gsync_running_local (volinfo->volname,
-                                                          slave, &is_running);
-                if (ret) {
-                        snprintf (msg, sizeof (msg), GEOREP" start option "
-                                  "validation failed ");
-                        goto out;
-                }
-                if (_gf_true == is_running) {
-                        snprintf (msg, sizeof (msg), GEOREP " session between"
-                                  " %s & %s already started", volinfo->volname,
-                                  slave);
-                        ret = -1;
-                        goto out;
-                }
+        ret = glusterd_check_gsync_running_local (volinfo->volname,
+                                                  slave, conf_path,
+                                                  &is_running);
+        if (ret) {
+                snprintf (msg, sizeof (msg), GEOREP" start option "
+                          "validation failed ");
+                goto out;
+        }
+        if (_gf_true == is_running) {
+                snprintf (msg, sizeof (msg), GEOREP " session between"
+                          " %s & %s already started", volinfo->volname,
+                          slave);
+                ret = -1;
+                goto out;
+        }
+
+        ret = glusterd_verify_gsyncd_spawn (volinfo->volname, slave);
+        if (ret) {
+                snprintf (msg, sizeof (msg), "Unable to spawn gsyncd");
+                gf_log ("", GF_LOG_ERROR, "%s", msg);
         }
-        ret = 0;
 out:
         if (ret && (msg[0] != '\0')) {
                 *op_errstr = gf_strdup (msg);
@@ -1017,11 +1296,13 @@ glusterd_check_gsync_running (glusterd_volinfo_t *volinfo, gf_boolean_t *flag)
 
 static int
 glusterd_op_verify_gsync_running (glusterd_volinfo_t *volinfo,
-                                  char *slave, char **op_errstr)
+                                  char *slave, char *conf_path,
+                                  char **op_errstr)
 {
-        int                     ret = -1;
-        char                    msg[2048] = {0};
-        uuid_t                  uuid = {0};
+        int        pfd               = -1;
+        int        ret               = -1;
+        char       msg[2048]         = {0};
+        char       pidfile[PATH_MAX] = {0,};
 
         GF_ASSERT (THIS && THIS->private);
         GF_ASSERT (volinfo);
@@ -1034,13 +1315,26 @@ glusterd_op_verify_gsync_running (glusterd_volinfo_t *volinfo,
 
                 goto out;
         }
-        ret = glusterd_gsync_get_uuid (slave, volinfo, uuid);
-        if (ret == -1) {
-                snprintf (msg, sizeof (msg), GEOREP" session between %s & %s"
-                          " not active", volinfo->volname, slave);
+
+        pfd = gsyncd_getpidfile (volinfo->volname, slave, pidfile, conf_path);
+        if (pfd == -2) {
+                gf_log ("", GF_LOG_ERROR, GEOREP" stop validation "
+                        "failed for %s & %s", volinfo->volname, slave);
+                ret = -1;
+                goto out;
+        }
+        if (gsync_status_byfd (pfd) == -1) {
+                snprintf (msg, sizeof (msg), GEOREP" session b/w %s & %s is not"
+                          " running on this node.", volinfo->volname, slave);
+                gf_log ("", GF_LOG_ERROR, "%s", msg);
+                ret = -1;
+                /* monitor gsyncd already dead */
                 goto out;
         }
 
+        if (pfd < 0)
+                goto out;
+
         ret = 0;
 out:
         if (ret && (msg[0] != '\0')) {
@@ -1059,6 +1353,18 @@ glusterd_verify_gsync_status_opts (dict_t *dict, char **op_errstr)
         gf_boolean_t       exists = _gf_false;
         glusterd_volinfo_t *volinfo = NULL;
         int                ret = 0;
+        char               *conf_path = NULL;
+        char               *slave_ip = NULL;
+        char               *slave_vol = NULL;
+        glusterd_conf_t    *priv = NULL;
+
+        if (THIS)
+                priv = THIS->private;
+        if (priv == NULL) {
+                gf_log ("", GF_LOG_ERROR, "priv of glusterd not present");
+                *op_errstr = gf_strdup ("glusterd defunct");
+                goto out;
+        }
 
         ret = dict_get_str (dict, "master", &volname);
         if (ret < 0) {
@@ -1083,16 +1389,25 @@ glusterd_verify_gsync_status_opts (dict_t *dict, char **op_errstr)
                 goto out;
         }
 
- out:
+        ret = glusterd_get_slave_details_confpath (volinfo, dict, &slave_ip,
+                                                   &slave_vol, &conf_path,
+                                                   op_errstr);
+        if (ret) {
+                gf_log ("", GF_LOG_ERROR,
+                        "Unable to fetch slave  or confpath details.");
+                ret = -1;
+                goto out;
+        }
+
+out:
         gf_log ("", GF_LOG_DEBUG, "Returning %d", ret);
         return ret;
-
 }
 
 
 int
 glusterd_op_gsync_args_get (dict_t *dict, char **op_errstr,
-                            char **master, char **slave)
+                            char **master, char **slave, char **host_uuid)
 {
 
         int             ret = -1;
@@ -1117,6 +1432,14 @@ glusterd_op_gsync_args_get (dict_t *dict, char **op_errstr,
                 }
         }
 
+        if (host_uuid) {
+                ret = dict_get_str (dict, "host-uuid", host_uuid);
+                if (ret < 0) {
+                        gf_log ("", GF_LOG_WARNING, "host_uuid not found");
+                        *op_errstr = gf_strdup ("host_uuid not found");
+                        goto out;
+                }
+        }
 
         ret = 0;
 out:
@@ -1125,17 +1448,647 @@ out:
 }
 
 int
+glusterd_op_stage_sys_exec (dict_t *dict, char **op_errstr)
+{
+        char             errmsg[PATH_MAX]          = "";
+        char            *command                   = NULL;
+        char             command_path[PATH_MAX]    = "";
+        struct stat      st                        = {0,};
+        int              ret                       = -1;
+        glusterd_conf_t *conf                      = NULL;
+        xlator_t        *this                      = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        conf = this->private;
+        GF_ASSERT (conf);
+
+        if (conf->op_version < 2) {
+                gf_log ("", GF_LOG_ERROR, "Op Version not supported.");
+                snprintf (errmsg, sizeof(errmsg), "One or more nodes do not"
+                          " support the required op version.");
+                *op_errstr = gf_strdup (errmsg);
+                ret = -1;
+                goto out;
+        }
+
+        ret = dict_get_str (dict, "command", &command);
+        if (ret) {
+                strcpy (errmsg, "internal error");
+                gf_log ("", GF_LOG_ERROR,
+                        "Unable to get command from dict");
+                goto out;
+        }
+
+        /* enforce local occurrence of the command */
+        if (strchr (command, '/')) {
+                strcpy (errmsg, "invalid command name");
+                ret = -1;
+                goto out;
+        }
+
+        sprintf (command_path, GSYNCD_PREFIX"/peer_%s", command);
+        /* check if it's executable */
+        ret = access (command_path, X_OK);
+        if (!ret)
+                /* check if it's a regular file */
+                ret = stat (command_path, &st);
+        if (!ret && !S_ISREG (st.st_mode))
+                ret = -1;
+
+out:
+        if (ret) {
+                if (errmsg[0] == '\0')
+                        snprintf (errmsg, sizeof (errmsg), "%s not found.",
+                                  command);
+                *op_errstr = gf_strdup (errmsg);
+                gf_log ("", GF_LOG_ERROR, "%s", errmsg);
+        }
+
+        gf_log ("", GF_LOG_DEBUG, "Returning %d", ret);
+        return ret;
+}
+
+int
+glusterd_op_stage_copy_file (dict_t *dict, char **op_errstr)
+{
+        char             abs_filename[PATH_MAX] = "";
+        char             errmsg[PATH_MAX]       = "";
+        char            *filename               = NULL;
+        char            *host_uuid              = NULL;
+        char             uuid_str [64]          = {0};
+        int              ret                    = -1;
+        glusterd_conf_t *priv                   = NULL;
+        struct stat      stbuf                  = {0,};
+
+        if (THIS)
+                priv = THIS->private;
+        if (priv == NULL) {
+                gf_log ("", GF_LOG_ERROR, "priv of glusterd not present");
+                *op_errstr = gf_strdup ("glusterd defunct");
+                goto out;
+        }
+
+        if (priv->op_version < 2) {
+                gf_log ("", GF_LOG_ERROR, "Op Version not supported.");
+                snprintf (errmsg, sizeof(errmsg), "One or more nodes do not"
+                          " support the required op version.");
+                *op_errstr = gf_strdup (errmsg);
+                ret = -1;
+                goto out;
+        }
+
+        ret = dict_get_str (dict, "host-uuid", &host_uuid);
+        if (ret < 0) {
+                gf_log ("", GF_LOG_ERROR, "Unable to fetch"
+                        " host-uuid from dict.");
+                goto out;
+        }
+
+        uuid_utoa_r (MY_UUID, uuid_str);
+        if (!strcmp (uuid_str, host_uuid)) {
+                ret = dict_get_str (dict, "source", &filename);
+                if (ret < 0) {
+                        gf_log ("", GF_LOG_ERROR, "Unable to fetch"
+                                " filename from dict.");
+                        *op_errstr = gf_strdup ("command unsuccessful");
+                        goto out;
+                }
+                snprintf (abs_filename, sizeof(abs_filename),
+                          "%s/%s", priv->workdir, filename);
+
+                ret = lstat (abs_filename, &stbuf);
+                if (ret) {
+                        snprintf (errmsg, sizeof (errmsg), "Source file"
+                                  " does not exist in %s", priv->workdir);
+                        *op_errstr = gf_strdup (errmsg);
+                        goto out;
+                }
+
+                if (!S_ISREG(stbuf.st_mode)) {
+                        snprintf (errmsg, sizeof (errmsg), "Source file"
+                                 " is not a regular file.");
+                        *op_errstr = gf_strdup (errmsg);
+                        gf_log ("", GF_LOG_ERROR, "%s", errmsg);
+                        ret = -1;
+                        goto out;
+                }
+        }
+
+        ret = 0;
+out:
+        gf_log ("", GF_LOG_DEBUG, "Returning %d", ret);
+        return ret;
+}
+
+static int
+glusterd_get_statefile_name (glusterd_volinfo_t *volinfo, char *slave,
+                             char *conf_path, char **statefile)
+{
+        glusterd_conf_t *priv = NULL;
+        int              ret = -1;
+        char            *master    = NULL;
+        char            *buf       = NULL;
+        dict_t          *confd = NULL;
+        char            *confpath = NULL;
+        char             conf_buf[PATH_MAX] = "";
+        struct stat      stbuf = {0,};
+
+        GF_ASSERT (THIS);
+        GF_ASSERT (THIS->private);
+        GF_ASSERT (volinfo);
+
+        master = volinfo->volname;
+
+        confd = dict_new ();
+        if (!confd) {
+                gf_log ("", GF_LOG_ERROR, "Unable to create new dict");
+                goto out;
+        }
+
+        priv = THIS->private;
+
+        ret = lstat (conf_path, &stbuf);
+        if (!ret) {
+                gf_log ("", GF_LOG_INFO, "Using passed config template(%s).",
+                        conf_path);
+                confpath = conf_path;
+        } else {
+                ret = snprintf (conf_buf, sizeof(conf_buf) - 1,
+                                "%s/"GSYNC_CONF_TEMPLATE, priv->workdir);
+                conf_buf[ret] = '\0';
+                confpath = conf_buf;
+                gf_log ("", GF_LOG_INFO, "Using default config template(%s).",
+                        confpath);
+        }
+
+        ret = glusterd_gsync_get_config (master, slave, confpath,
+                                         confd);
+        if (ret) {
+                gf_log ("", GF_LOG_ERROR, "Unable to get configuration data"
+                        "for %s(master), %s(slave)", master, slave);
+                goto out;
+
+        }
+
+        ret = dict_get_param (confd, "state_file", &buf);
+        if (ret) {
+                gf_log ("", GF_LOG_ERROR, "Unable to get state_file's name.");
+                goto out;
+        }
+
+        *statefile = gf_strdup(buf);
+        if (!*statefile) {
+                gf_log ("", GF_LOG_ERROR, "Unable to gf_strdup.");
+                ret = -1;
+                goto out;
+        }
+
+        ret = 0;
+ out:
+        if (confd)
+                dict_destroy (confd);
+
+        gf_log ("", GF_LOG_DEBUG, "Returning %d ", ret);
+        return ret;
+}
+
+static int
+glusterd_create_status_file (char *master, char *slave, char *slave_ip,
+                             char *slave_vol, char *status)
+{
+        int                ret    = -1;
+        runner_t           runner = {0,};
+        glusterd_conf_t   *priv   = NULL;
+
+        if (THIS)
+                priv = THIS->private;
+        if (priv == NULL) {
+                gf_log ("", GF_LOG_ERROR, "priv of glusterd not present");
+                goto out;
+        }
+
+        if (!status) {
+                gf_log ("", GF_LOG_ERROR, "Status Empty");
+                goto out;
+        }
+        gf_log ("", GF_LOG_DEBUG, "slave = %s", slave);
+
+        runinit (&runner);
+        runner_add_args (&runner, GSYNCD_PREFIX"/gsyncd", "--create",
+                         status, "-c", NULL);
+        runner_argprintf (&runner, "%s/"GEOREP"/%s_%s_%s/gsyncd.conf",
+                          priv->workdir, master, slave_ip, slave_vol);
+        runner_argprintf (&runner, ":%s", master);
+        runner_add_args  (&runner, slave, NULL);
+        synclock_unlock (&priv->big_lock);
+        ret = runner_run (&runner);
+        synclock_lock (&priv->big_lock);
+        if (ret) {
+                gf_log ("", GF_LOG_ERROR, "Creating status file failed.");
+                ret = -1;
+                goto out;
+        }
+
+        ret = 0;
+out:
+        gf_log ("", GF_LOG_DEBUG, "returning %d", ret);
+        return ret;
+}
+
+static int
+glusterd_verify_slave (char *volname, char *slave_ip, char *slave,
+                       char **op_errstr, gf_boolean_t *is_force_blocker)
+{
+        int32_t          ret                     = -1;
+        runner_t         runner                  = {0,};
+        char             log_file_path[PATH_MAX] = "";
+        char             buf[PATH_MAX]           = "";
+        char            *tmp                     = NULL;
+        char            *save_ptr                = NULL;
+        glusterd_conf_t *priv                    = NULL;
+
+        GF_ASSERT (volname);
+        GF_ASSERT (slave_ip);
+        GF_ASSERT (slave);
+
+        if (THIS)
+                priv = THIS->private;
+        if (priv == NULL) {
+                gf_log ("", GF_LOG_ERROR, "priv of glusterd not present");
+                goto out;
+        }
+
+        snprintf (log_file_path, sizeof(log_file_path),
+                  DEFAULT_LOG_FILE_DIRECTORY"/create_verify_log");
+
+        runinit (&runner);
+        runner_add_args  (&runner, GSYNCD_PREFIX"/gverify.sh", NULL);
+        runner_argprintf (&runner, "%s", volname);
+        runner_argprintf (&runner, "%s", slave_ip);
+        runner_argprintf (&runner, "%s", slave);
+        runner_argprintf (&runner, "%s", log_file_path);
+        runner_redir (&runner, STDOUT_FILENO, RUN_PIPE);
+        synclock_unlock (&priv->big_lock);
+        ret = runner_run (&runner);
+        synclock_lock (&priv->big_lock);
+        if (ret) {
+                gf_log ("", GF_LOG_ERROR, "Not a valid slave");
+                ret = glusterd_gsync_read_frm_status (log_file_path,
+                                                      buf, sizeof(buf));
+                if (ret) {
+                        gf_log ("", GF_LOG_ERROR, "Unable to read from %s",
+                                log_file_path);
+                        goto out;
+                }
+
+                /* Tokenize the error message from gverify.sh to figure out
+                 * if the error is a force blocker or not. */
+                tmp = strtok_r (buf, "|", &save_ptr);
+                if (!strcmp (tmp, "FORCE_BLOCKER"))
+                        *is_force_blocker = 1;
+                else {
+                        /* No FORCE_BLOCKER flag present so all that is
+                         * present is the error message. */
+                        *is_force_blocker = 0;
+                        if (tmp)
+                                *op_errstr = gf_strdup (tmp);
+                        ret = -1;
+                        goto out;
+                }
+
+                /* Copy rest of the error message to op_errstr */
+                tmp = strtok_r (NULL, "|", &save_ptr);
+                if (tmp)
+                        *op_errstr = gf_strdup (tmp);
+                ret = -1;
+                goto out;
+        }
+        ret = 0;
+out:
+        unlink (log_file_path);
+        gf_log ("", GF_LOG_DEBUG, "Returning %d", ret);
+        return ret;
+}
+
+int
+glusterd_mountbroker_check (char **slave_ip, char **op_errstr)
+{
+        int   ret             = -1;
+        char *tmp             = NULL;
+        char *save_ptr        = NULL;
+        char *username        = NULL;
+        char *host            = NULL;
+        char errmsg[PATH_MAX] = "";
+
+        GF_ASSERT (slave_ip);
+        GF_ASSERT (*slave_ip);
+
+        /* Checking if hostname has user specified */
+        host = strstr (*slave_ip, "@");
+        if (!host) {
+                gf_log ("", GF_LOG_DEBUG, "No username provided.");
+                ret = 0;
+                goto out;
+        } else {
+                /* Moving the host past the '@' and checking if the
+                 * actual hostname also has '@' */
+                host++;
+                if (strstr (host, "@")) {
+                        gf_log ("", GF_LOG_DEBUG, "host = %s", host);
+                        ret = snprintf (errmsg, sizeof(errmsg) - 1,
+                                        "Invalid Hostname (%s).", host);
+                        errmsg[ret] = '\0';
+                        gf_log ("", GF_LOG_ERROR, "%s", errmsg);
+                        ret = -1;
+                        if (op_errstr)
+                                *op_errstr = gf_strdup (errmsg);
+                        goto out;
+                }
+
+                /* Fetching the username and hostname
+                 * and checking if the username is non-root */
+                username = strtok_r (*slave_ip, "@", &save_ptr);
+                tmp = strtok_r (NULL, "@", &save_ptr);
+                if (strcmp (username, "root")) {
+                        ret = snprintf (errmsg, sizeof(errmsg) - 1,
+                                        "Non-root username (%s@%s) not allowed.",
+                                        username, tmp);
+                        errmsg[ret] = '\0';
+                        if (op_errstr)
+                                *op_errstr = gf_strdup (errmsg);
+                        gf_log ("", GF_LOG_ERROR,
+                                "Non-Root username not allowed.");
+                        ret = -1;
+                        goto out;
+                }
+
+                *slave_ip = gf_strdup (tmp);
+                if (!*slave_ip) {
+                        gf_log ("", GF_LOG_ERROR, "Out of memory");
+                        ret = -1;
+                        goto out;
+                }
+        }
+
+        ret = 0;
+out:
+        gf_log ("", GF_LOG_DEBUG, "Returning %d", ret);
+        return ret;
+}
+
+int
+glusterd_op_stage_gsync_create (dict_t *dict, char **op_errstr)
+{
+        char               *down_peerstr              = NULL;
+        char               *slave                     = NULL;
+        char               *volname                   = NULL;
+        char               *host_uuid                 = NULL;
+        char               *statefile                 = NULL;
+        char               *slave_ip                  = NULL;
+        char               *slave_vol                 = NULL;
+        char               *conf_path                 = NULL;
+        char                errmsg[PATH_MAX]          = "";
+        char                common_pem_file[PATH_MAX] = "";
+        char                hook_script[PATH_MAX]     = "";
+        char                uuid_str [64]             = "";
+        int                 ret                       = -1;
+        int                 is_pem_push               = -1;
+        gf_boolean_t        is_force                  = -1;
+        gf_boolean_t        is_force_blocker          = -1;
+        gf_boolean_t        exists                    = _gf_false;
+        glusterd_conf_t    *conf                      = NULL;
+        glusterd_volinfo_t *volinfo                   = NULL;
+        struct stat         stbuf                     = {0,};
+        xlator_t           *this                      = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        conf = this->private;
+        GF_ASSERT (conf);
+
+        ret = glusterd_op_gsync_args_get (dict, op_errstr, &volname,
+                                          &slave, &host_uuid);
+        if (ret) {
+                gf_log ("", GF_LOG_ERROR, "Unable to fetch arguments");
+                gf_log ("", GF_LOG_DEBUG, "Returning %d", ret);
+                return -1;
+        }
+
+        if (conf->op_version < 2) {
+                gf_log ("", GF_LOG_ERROR, "Op Version not supported.");
+                snprintf (errmsg, sizeof(errmsg), "One or more nodes do not"
+                          " support the required op version.");
+                *op_errstr = gf_strdup (errmsg);
+                ret = -1;
+                goto out;
+        }
+
+        exists = glusterd_check_volume_exists (volname);
+        ret = glusterd_volinfo_find (volname, &volinfo);
+        if ((ret) || (!exists)) {
+                gf_log ("", GF_LOG_WARNING, "volume name does not exist");
+                snprintf (errmsg, sizeof(errmsg), "Volume name %s does not"
+                          " exist", volname);
+                *op_errstr = gf_strdup (errmsg);
+                gf_log ("", GF_LOG_DEBUG, "Returning %d", ret);
+                return -1;
+        }
+
+        ret = glusterd_get_slave_details_confpath (volinfo, dict, &slave_ip,
+                                                   &slave_vol, &conf_path,
+                                                   op_errstr);
+        if (ret) {
+                gf_log ("", GF_LOG_ERROR,
+                        "Unable to fetch slave or confpath details.");
+                ret = -1;
+                goto out;
+        }
+
+        is_force = dict_get_str_boolean (dict, "force", _gf_false);
+
+        uuid_utoa_r (MY_UUID, uuid_str);
+        if (!strcmp (uuid_str, host_uuid)) {
+                ret = glusterd_are_vol_all_peers_up (volinfo,
+                                                     &conf->peers,
+                                                     &down_peerstr);
+                if ((ret == _gf_false) && !is_force) {
+                        snprintf (errmsg, sizeof (errmsg), "Peer %s,"
+                                  " which is a part of %s volume, is"
+                                  " down. Please bring up the peer and"
+                                  " retry.", down_peerstr,
+                                  volinfo->volname);
+                        gf_log ("", GF_LOG_ERROR, "%s", errmsg);
+                        *op_errstr = gf_strdup (errmsg);
+                        GF_FREE (down_peerstr);
+                        down_peerstr = NULL;
+                        gf_log ("", GF_LOG_DEBUG, "Returning %d", ret);
+                        return -1;
+                } else if (ret == _gf_false) {
+                        gf_log ("", GF_LOG_INFO, "Peer %s,"
+                                " which is a part of %s volume, is"
+                                " down. Force creating geo-rep session."
+                                " On bringing up the peer, re-run"
+                                " \"gluster system:: execute"
+                                " gsec_create\" and \"gluster volume"
+                                " geo-replication %s %s create push-pem"
+                                " force\"", down_peerstr, volinfo->volname,
+                                volinfo->volname, slave);
+                }
+
+                /* Checking if slave host is pingable, has proper passwordless
+                 * ssh login setup, slave volume is created, slave vol is empty,
+                 * and if it has enough memory and bypass in case of force if
+                 * the error is not a force blocker */
+                ret = glusterd_verify_slave (volname, slave_ip, slave_vol,
+                                             op_errstr, &is_force_blocker);
+                if (ret) {
+                        if (is_force && !is_force_blocker) {
+                                gf_log ("", GF_LOG_INFO, "%s is not a valid slave"
+                                        " volume. Error: %s. Force creating geo-rep"
+                                        " session.", slave, *op_errstr);
+                        } else {
+                                gf_log ("", GF_LOG_ERROR,
+                                        "%s is not a valid slave volume. Error: %s",
+                                        slave, *op_errstr);
+                                ret = -1;
+                                goto out;
+                        }
+                }
+
+                ret = dict_get_int32 (dict, "push_pem", &is_pem_push);
+                if (!ret && is_pem_push) {
+                        ret = snprintf (common_pem_file,
+                                        sizeof(common_pem_file) - 1,
+                                        "%s"GLUSTERD_COMMON_PEM_PUB_FILE,
+                                        conf->workdir);
+                        common_pem_file[ret] = '\0';
+
+                        ret = snprintf (hook_script, sizeof(hook_script) - 1,
+                                        "%s"GLUSTERD_CREATE_HOOK_SCRIPT,
+                                        conf->workdir);
+                        hook_script[ret] = '\0';
+
+                        ret = lstat (common_pem_file, &stbuf);
+                        if (ret) {
+                                snprintf (errmsg, sizeof (errmsg), "%s"
+                                          " required for push-pem is"
+                                          " not present. Please run"
+                                          " \"gluster system:: execute"
+                                          " gsec_create\"", common_pem_file);
+                                gf_log ("", GF_LOG_ERROR, "%s", errmsg);
+                                *op_errstr = gf_strdup (errmsg);
+                                ret = -1;
+                                goto out;
+                        }
+
+                        ret = lstat (hook_script, &stbuf);
+                        if (ret) {
+                                snprintf (errmsg, sizeof (errmsg),
+                                          "The hook-script (%s) required "
+                                          "for push-pem is not present. "
+                                          "Please install the hook-script "
+                                          "and retry", hook_script);
+                                gf_log ("", GF_LOG_ERROR, "%s", errmsg);
+                                *op_errstr = gf_strdup (errmsg);
+                                ret = -1;
+                                goto out;
+                        }
+
+                        if (!S_ISREG(stbuf.st_mode)) {
+                                snprintf (errmsg, sizeof (errmsg), "%s"
+                                          " required for push-pem is"
+                                          " not a regular file. Please run"
+                                          " \"gluster system:: execute"
+                                          " gsec_create\"", common_pem_file);
+                                gf_log ("", GF_LOG_ERROR, "%s", errmsg);
+                                ret = -1;
+                                goto out;
+                        }
+                }
+        }
+
+        ret = glusterd_get_statefile_name (volinfo, slave, conf_path, &statefile);
+        if (ret) {
+                if (!strstr(slave, "::"))
+                        snprintf (errmsg, sizeof (errmsg),
+                                  "%s is not a valid slave url.", slave);
+                else
+                        snprintf (errmsg, sizeof (errmsg), "Please check gsync "
+                                  "config file. Unable to get statefile's name");
+                gf_log ("", GF_LOG_ERROR, "%s", errmsg);
+                ret = -1;
+                goto out;
+        }
+
+        ret = dict_set_str (dict, "statefile", statefile);
+        if (ret) {
+                gf_log ("", GF_LOG_ERROR,
+                        "Unable to store statefile path");
+                goto out;
+        }
+
+        ret = lstat (statefile, &stbuf);
+        if (!ret && !is_force) {
+                snprintf (errmsg, sizeof (errmsg), "Session between %s"
+                          " and %s is already created.",
+                          volinfo->volname, slave);
+                gf_log ("", GF_LOG_ERROR, "%s", errmsg);
+                ret = -1;
+                goto out;
+        } else if (!ret)
+                gf_log ("", GF_LOG_INFO, "Session between %s"
+                        " and %s is already created. Force"
+                        " creating again.", volinfo->volname, slave);
+
+        ret = glusterd_verify_gsyncd_spawn (volinfo->volname, slave);
+        if (ret) {
+                snprintf (errmsg, sizeof (errmsg), "Unable to spawn gsyncd.");
+                gf_log ("", GF_LOG_ERROR, "%s", errmsg);
+                goto out;
+        }
+
+        ret = 0;
+out:
+
+        if (ret && errmsg[0] != '\0')
+                *op_errstr = gf_strdup (errmsg);
+
+        gf_log ("", GF_LOG_DEBUG, "Returning %d", ret);
+        return ret;
+}
+
+int
 glusterd_op_stage_gsync_set (dict_t *dict, char **op_errstr)
 {
         int                     ret     = 0;
         int                     type    = 0;
         char                    *volname = NULL;
         char                    *slave   = NULL;
+        char                    *slave_ip = NULL;
+        char                    *slave_vol = NULL;
+        char                    *down_peerstr = NULL;
+        char                    *statefile    = NULL;
+        char                    *path_list    = NULL;
+        char                    *conf_path    = NULL;
         gf_boolean_t            exists   = _gf_false;
         glusterd_volinfo_t      *volinfo = NULL;
         char                    errmsg[PATH_MAX] = {0,};
         dict_t                  *ctx = NULL;
+        gf_boolean_t            is_force = 0;
+        gf_boolean_t            is_force_blocker = -1;
+        gf_boolean_t            is_running = _gf_false;
+        uuid_t                  uuid = {0};
+        char                    uuid_str [64] = {0};
+        char                    *host_uuid = NULL;
+        xlator_t                *this = NULL;
+        glusterd_conf_t         *conf = NULL;
+        struct stat             stbuf = {0,};
 
+        this = THIS;
+        GF_ASSERT (this);
+        conf = this->private;
+        GF_ASSERT (conf);
 
         ret = dict_get_int32 (dict, "type", &type);
         if (ret < 0) {
@@ -1144,25 +2097,26 @@ glusterd_op_stage_gsync_set (dict_t *dict, char **op_errstr)
                 goto out;
         }
 
-        switch (type) {
-        case GF_GSYNC_OPTION_TYPE_STATUS:
+        if (type == GF_GSYNC_OPTION_TYPE_STATUS) {
                 ret = glusterd_verify_gsync_status_opts (dict, op_errstr);
-
                 goto out;
-        case GF_GSYNC_OPTION_TYPE_CONFIG:
-                ret = gsync_verify_config_options (dict, op_errstr);
+        }
 
+        ret = glusterd_op_gsync_args_get (dict, op_errstr,
+                                          &volname, &slave, &host_uuid);
+        if (ret)
                 goto out;
 
-        case GF_GSYNC_OPTION_TYPE_ROTATE:
-                /* checks same as status mode */
-                ret = glusterd_verify_gsync_status_opts(dict, op_errstr);
-                goto out;
-        }
+        uuid_utoa_r (MY_UUID, uuid_str);
 
-        ret = glusterd_op_gsync_args_get (dict, op_errstr, &volname, &slave);
-        if (ret)
+        if (conf->op_version < 2) {
+                gf_log ("", GF_LOG_ERROR, "Op Version not supported.");
+                snprintf (errmsg, sizeof(errmsg), "One or more nodes do not"
+                          " support the required op version.");
+               *op_errstr = gf_strdup (errmsg);
+                ret = -1;
                 goto out;
+        }
 
         exists = glusterd_check_volume_exists (volname);
         ret = glusterd_volinfo_find (volname, &volinfo);
@@ -1175,12 +2129,96 @@ glusterd_op_stage_gsync_set (dict_t *dict, char **op_errstr)
                 goto out;
         }
 
+        ret = glusterd_get_slave_details_confpath (volinfo, dict, &slave_ip,
+                                                   &slave_vol, &conf_path,
+                                                   op_errstr);
+        if (ret) {
+                gf_log ("", GF_LOG_ERROR,
+                        "Unable to fetch slave or confpath details.");
+                ret = -1;
+                goto out;
+        }
+
+        ret = glusterd_get_statefile_name (volinfo, slave, conf_path, &statefile);
+        if (ret) {
+                /* Checking if slave host is pingable, has proper passwordless
+                 * ssh login setup */
+                ret = glusterd_verify_slave (volname, slave_ip, slave_vol,
+                                             op_errstr, &is_force_blocker);
+                if (ret) {
+                        gf_log ("", GF_LOG_ERROR,
+                                "%s is not a valid slave volume. Error: %s",
+                                slave, *op_errstr);
+                        goto out;
+                }
+
+                if (!strstr(slave, "::"))
+                        snprintf (errmsg, sizeof (errmsg),
+                                  "%s is not a valid slave url.", slave);
+                else
+                        snprintf (errmsg, sizeof (errmsg),
+                                  "Unable to get statefile's name");
+                gf_log ("", GF_LOG_ERROR, "%s", errmsg);
+                ret = -1;
+                goto out;
+        }
+
+        ret = dict_set_str (dict, "statefile", statefile);
+        if (ret) {
+                gf_log ("", GF_LOG_ERROR,
+                        "Unable to store statefile path");
+                goto out;
+        }
+
+        is_force = dict_get_str_boolean (dict, "force", _gf_false);
+
+        /* Allowing stop force to bypass the statefile check
+         * as this command acts as a fail safe method to stop geo-rep
+         * session. */
+        if ((type == GF_GSYNC_OPTION_TYPE_CONFIG) ||
+            ((type == GF_GSYNC_OPTION_TYPE_STOP) && !is_force) ||
+            (type == GF_GSYNC_OPTION_TYPE_DELETE)) {
+                ret = lstat (statefile, &stbuf);
+                if (ret) {
+                        snprintf (errmsg, sizeof(errmsg), "Geo-replication"
+                                  " session between %s and %s does not exist.",
+                                  volinfo->volname, slave);
+                        gf_log ("", GF_LOG_ERROR, "%s. statefile = %s",
+                                errmsg, statefile);
+                        *op_errstr = gf_strdup (errmsg);
+                        ret = -1;
+                        goto out;
+                }
+        }
+
+        /* Check if all peers that are a part of the volume are up or not */
+        if ((type == GF_GSYNC_OPTION_TYPE_DELETE) ||
+            ((type == GF_GSYNC_OPTION_TYPE_STOP) && !is_force)) {
+                if (!strcmp (uuid_str, host_uuid)) {
+                        ret = glusterd_are_vol_all_peers_up (volinfo,
+                                                             &conf->peers,
+                                                             &down_peerstr);
+                        if (ret == _gf_false) {
+                                snprintf (errmsg, sizeof (errmsg), "Peer %s,"
+                                          " which is a part of %s volume, is"
+                                          " down. Please bring up the peer and"
+                                          " retry.", down_peerstr,
+                                          volinfo->volname);
+                                *op_errstr = gf_strdup (errmsg);
+                                ret = -1;
+                                GF_FREE (down_peerstr);
+                                down_peerstr = NULL;
+                                goto out;
+                        }
+                }
+        }
+
         switch (type) {
         case GF_GSYNC_OPTION_TYPE_START:
                 /* don't attempt to start gsync if replace-brick is
                  * in progress */
                 if (glusterd_is_rb_ongoing (volinfo)) {
-                        snprintf (errmsg, sizeof(errmsg),"replace-brick is in"
+                        snprintf (errmsg, sizeof(errmsg), "replace-brick is in"
                                    " progress, not starting geo-replication");
                         *op_errstr = gf_strdup (errmsg);
                         ret = -1;
@@ -1188,16 +2226,18 @@ glusterd_op_stage_gsync_set (dict_t *dict, char **op_errstr)
                 }
 
                 ret = glusterd_op_verify_gsync_start_options (volinfo, slave,
-                                                              op_errstr);
+                                                              conf_path, statefile,
+                                                              op_errstr, is_force);
                 if (ret)
                         goto out;
                 ctx = glusterd_op_get_ctx();
                 if (ctx) {
-                        /*gsyncd does a fuse mount to start the geo-rep session*/
+                        /* gsyncd does a fuse mount to start
+                         * the geo-rep session */
                         if (!glusterd_is_fuse_available ()) {
-                                gf_log ("glusterd", GF_LOG_ERROR, "Unable to open"
-                                        " /dev/fuse (%s), geo-replication start"
-                                        " failed", strerror (errno));
+                                gf_log ("glusterd", GF_LOG_ERROR, "Unable to "
+                                        "open /dev/fuse (%s), geo-replication "
+                                        "start failed", strerror (errno));
                                 snprintf (errmsg, sizeof(errmsg),
                                           "fuse unvailable");
                                 *op_errstr = gf_strdup (errmsg);
@@ -1208,17 +2248,72 @@ glusterd_op_stage_gsync_set (dict_t *dict, char **op_errstr)
                 break;
 
         case GF_GSYNC_OPTION_TYPE_STOP:
-                ret = glusterd_op_verify_gsync_running (volinfo, slave,
-                                                        op_errstr);
+                if (!is_force) {
+                        ret = glusterd_op_verify_gsync_running (volinfo, slave,
+                                                                conf_path,
+                                                                op_errstr);
+                        if (ret) {
+                                ret = glusterd_get_local_brickpaths (volinfo,
+                                                                     &path_list);
+                                if (path_list)
+                                        ret = -1;
+                        }
+                }
+                break;
+
+        case GF_GSYNC_OPTION_TYPE_CONFIG:
+                ret = gsync_verify_config_options (dict, op_errstr, volname);
+                goto out;
+                break;
+
+        case GF_GSYNC_OPTION_TYPE_DELETE:
+                /* Check if the gsync session is still running
+                 * If so ask the user to stop geo-replication first.*/
+                ret = glusterd_gsync_get_uuid (slave, volinfo, uuid);
+                if (ret) {
+                        snprintf (errmsg, sizeof(errmsg), "Geo-replication"
+                                  " session between %s and %s does not exist.",
+                                  volinfo->volname, slave);
+                        gf_log ("", GF_LOG_ERROR, "%s", errmsg);
+                        *op_errstr = gf_strdup (errmsg);
+                        ret = -1;
+                        goto out;
+                } else {
+                        ret = glusterd_check_gsync_running_local (volinfo->volname,
+                                                                  slave, conf_path,
+                                                                  &is_running);
+                        if (_gf_true == is_running) {
+                                snprintf (errmsg, sizeof (errmsg), GEOREP
+                                          " session between %s & %s is "
+                                          "still active. Please stop the "
+                                          "session and retry.",
+                                          volinfo->volname, slave);
+                                gf_log ("", GF_LOG_ERROR, "%s", errmsg);
+                                *op_errstr = gf_strdup (errmsg);
+                                ret = -1;
+                                goto out;
+                        }
+                }
+
+                ret = glusterd_verify_gsyncd_spawn (volinfo->volname, slave);
+                if (ret) {
+                        snprintf (errmsg, sizeof (errmsg),
+                                  "Unable to spawn gsyncd");
+                        *op_errstr = gf_strdup (errmsg);
+                        gf_log ("", GF_LOG_ERROR, "%s", errmsg);
+                }
+
                 break;
         }
 
 out:
+        gf_log ("", GF_LOG_DEBUG, "Returning %d", ret);
         return ret;
 }
 
 static int
-stop_gsync (char *master, char *slave, char **msg)
+stop_gsync (char *master, char *slave, char **msg,
+            char *conf_path, gf_boolean_t is_force)
 {
         int32_t         ret     = 0;
         int             pfd     = -1;
@@ -1230,19 +2325,16 @@ stop_gsync (char *master, char *slave, char **msg)
         GF_ASSERT (THIS);
         GF_ASSERT (THIS->private);
 
-        pfd = gsyncd_getpidfile (master, slave, pidfile);
-        if (pfd == -2) {
+        pfd = gsyncd_getpidfile (master, slave, pidfile, conf_path);
+        if (pfd == -2 && !is_force) {
                 gf_log ("", GF_LOG_ERROR, GEOREP" stop validation "
                         " failed for %s & %s", master, slave);
                 ret = -1;
                 goto out;
         }
-        if (gsync_status_byfd (pfd) == -1) {
+        if (gsync_status_byfd (pfd) == -1 && !is_force) {
                 gf_log ("", GF_LOG_ERROR, "gsyncd b/w %s & %s is not"
                         " running", master, slave);
-                if (msg)
-                        *msg = gf_strdup ("Warning: "GEOREP" session was "
-                                          "defunct at stop time");
                 /* monitor gsyncd already dead */
                 goto out;
         }
@@ -1277,16 +2369,16 @@ stop_gsync (char *master, char *slave, char **msg)
 
 out:
         sys_close (pfd);
+
+        if (is_force)
+                ret = 0;
         return ret;
 }
 
 static int
-glusterd_check_restart_gsync_session (glusterd_volinfo_t *volinfo, char *slave,
-                                      dict_t *resp_dict);
-
-static int
 glusterd_gsync_configure (glusterd_volinfo_t *volinfo, char *slave,
-                          dict_t *dict, dict_t *resp_dict, char **op_errstr)
+                          char *path_list, dict_t *dict,
+                          dict_t *resp_dict, char **op_errstr)
 {
         int32_t         ret     = -1;
         char            *op_name = NULL;
@@ -1295,6 +2387,10 @@ glusterd_gsync_configure (glusterd_volinfo_t *volinfo, char *slave,
         glusterd_conf_t *priv   = NULL;
         char            *subop  = NULL;
         char            *master = NULL;
+        char            *conf_path = NULL;
+        char            *slave_ip  = NULL;
+        char            *slave_vol = NULL;
+        struct stat      stbuf     = {0, };
 
         GF_ASSERT (slave);
         GF_ASSERT (op_errstr);
@@ -1329,10 +2425,17 @@ glusterd_gsync_configure (glusterd_volinfo_t *volinfo, char *slave,
                 goto out;
         }
 
+        ret = dict_get_str (dict, "conf_path", &conf_path);
+        if (ret) {
+                gf_log ("", GF_LOG_ERROR,
+                        "Unable to fetch conf file path.");
+                goto out;
+        }
+
         master = "";
         runinit (&runner);
         runner_add_args (&runner, GSYNCD_PREFIX"/gsyncd", "-c", NULL);
-        runner_argprintf (&runner, "%s/"GSYNC_CONF, priv->workdir);
+        runner_argprintf (&runner, "%s", conf_path);
         if (volinfo) {
                 master = volinfo->volname;
                 runner_argprintf (&runner, ":%s", master);
@@ -1342,7 +2445,9 @@ glusterd_gsync_configure (glusterd_volinfo_t *volinfo, char *slave,
         runner_add_arg (&runner, op_name);
         if (op_value)
                 runner_add_arg (&runner, op_value);
+        synclock_unlock (&priv->big_lock);
         ret = runner_run (&runner);
+        synclock_lock (&priv->big_lock);
         if (ret) {
                 gf_log ("", GF_LOG_WARNING, "gsyncd failed to "
                         "%s %s option for %s %s peers",
@@ -1353,13 +2458,46 @@ glusterd_gsync_configure (glusterd_volinfo_t *volinfo, char *slave,
 
                 goto out;
         }
+
+        if (!strcmp (op_name, "state_file")) {
+
+                ret = lstat (op_value, &stbuf);
+                if (ret) {
+                        ret = dict_get_str (dict, "slave_ip", &slave_ip);
+                        if (ret) {
+                                gf_log ("", GF_LOG_ERROR,
+                                        "Unable to fetch slave IP.");
+                                goto out;
+                        }
+
+                        ret = dict_get_str (dict, "slave_vol", &slave_vol);
+                        if (ret) {
+                                gf_log ("", GF_LOG_ERROR,
+                                        "Unable to fetch slave volume name.");
+                                goto out;
+                        }
+
+                        ret = glusterd_create_status_file (volinfo->volname, slave,
+                                                           slave_ip, slave_vol,
+                                                           "Switching Status File");
+                        if (ret || lstat (op_value, &stbuf)) {
+                                gf_log ("", GF_LOG_ERROR, "Unable to create %s"
+                                        ". Error : %s", op_value,
+                                        strerror (errno));
+                                ret = -1;
+                                goto out;
+                        }
+                }
+        }
+
         ret = 0;
         gf_asprintf (op_errstr, "config-%s successful", subop);
 
 out:
         if (!ret && volinfo) {
                 ret = glusterd_check_restart_gsync_session (volinfo, slave,
-                                                            resp_dict);
+                                                            resp_dict, path_list,
+                                                            conf_path, 0);
                 if (ret)
                         *op_errstr = gf_strdup ("internal error");
         }
@@ -1485,13 +2623,14 @@ dict_get_param (dict_t *dict, char *key, char **param)
 }
 
 static int
-glusterd_read_status_file (char *master, char *slave,
-                           dict_t *dict, char *node)
+glusterd_read_status_file (glusterd_volinfo_t *volinfo, char *slave,
+                           char *conf_path, dict_t *dict, char *node)
 {
         glusterd_conf_t *priv = NULL;
         int              ret = 0;
         char            *statefile = NULL;
-        char             buf[1024] = {0, };
+        char            *master    = NULL;
+        char             buf[1024] = "defunct";
         char             nds[1024] = {0, };
         char             mst[1024] = {0, };
         char             slv[1024] = {0, };
@@ -1501,34 +2640,38 @@ glusterd_read_status_file (char *master, char *slave,
         int              gsync_count = 0;
         int              status = 0;
         char *dyn_node = NULL;
+        char *path_list = NULL;
 
         GF_ASSERT (THIS);
         GF_ASSERT (THIS->private);
+        GF_ASSERT (volinfo);
+
+        master = volinfo->volname;
 
         confd = dict_new ();
-        if (!dict)
+        if (!dict) {
+                gf_log ("", GF_LOG_ERROR, "Not able to create dict.");
                 return -1;
+        }
 
         priv = THIS->private;
-        ret = glusterd_gsync_get_config (master, slave, priv->workdir,
+
+        ret = glusterd_gsync_get_config (master, slave, conf_path,
                                          confd);
         if (ret) {
                 gf_log ("", GF_LOG_ERROR, "Unable to get configuration data"
                         "for %s(master), %s(slave)", master, slave);
-                goto out;
+                goto done;
 
         }
 
-        ret = gsync_status (master, slave, &status);
-        if (ret == 0 && status == -1) {
-                strncpy (buf, "defunct", sizeof (buf));
-                goto done;
-        } else if (ret == -1)
-                goto out;
-
         ret = dict_get_param (confd, "state_file", &statefile);
-        if (ret)
-                goto out;
+        if (ret) {
+                gf_log ("", GF_LOG_ERROR, "Unable to get state_file's name "
+                        "for %s(master), %s(slave). Please check gsync "
+                        "config file.", master, slave);
+                goto done;
+        }
         ret = glusterd_gsync_read_frm_status (statefile, buf, sizeof (buf));
         if (ret) {
                 gf_log ("", GF_LOG_ERROR, "Unable to read the status"
@@ -1536,12 +2679,27 @@ glusterd_read_status_file (char *master, char *slave,
                 strncpy (buf, "defunct", sizeof (buf));
                 goto done;
         }
-        if (strcmp (buf, "OK") != 0)
+
+        ret = gsync_status (master, slave, conf_path, &status);
+        if (ret == 0 && status == -1) {
+                if ((strcmp (buf, "Not Started")) &&
+                    (strcmp (buf, "Stopped")))
+                    strncpy (buf, "defunct", sizeof (buf));
+                goto done;
+        } else if (ret == -1) {
+                gf_log ("", GF_LOG_ERROR, "Unable to get gsync status");
+                goto done;
+        }
+
+        if (strcmp (buf, "Stable") != 0)
                 goto done;
 
         ret = dict_get_param (confd, "state_socket_unencoded", &statefile);
-        if (ret)
-                goto out;
+        if (ret) {
+                gf_log ("", GF_LOG_ERROR, "Unable to get state_socket_unencoded"
+                        " filepath. Please check gsync config file.");
+                goto done;
+        }
         ret = glusterd_gsync_fetch_status_extra (statefile, buf, sizeof (buf));
         if (ret) {
                 gf_log ("", GF_LOG_ERROR, "Unable to fetch extra status"
@@ -1562,6 +2720,19 @@ glusterd_read_status_file (char *master, char *slave,
         }
 
  done:
+        if ((!strcmp (buf, "defunct")) ||
+            (!strcmp (buf, "Not Started")) ||
+            (!strcmp (buf, "Stopped"))) {
+                ret = glusterd_get_local_brickpaths (volinfo, &path_list);
+                if (!path_list) {
+                        gf_log ("", GF_LOG_DEBUG, "This node not being part of"
+                                " volume should not be running gsyncd. Hence"
+                                " shouldn't display status for this node.");
+                        ret = 0;
+                        goto out;
+                }
+        }
+
         ret = dict_get_int32 (dict, "gsync-count", &gsync_count);
 
         if (ret)
@@ -1612,23 +2783,22 @@ glusterd_read_status_file (char *master, char *slave,
         if (ret)
                 goto out;
 
-        ret = 0;
  out:
         dict_destroy (confd);
 
-        gf_log ("", GF_LOG_DEBUG, "Returning %d ", ret);
-        return ret;
+        return 0;
 }
 
-static int
+int
 glusterd_check_restart_gsync_session (glusterd_volinfo_t *volinfo, char *slave,
-                                      dict_t *resp_dict)
+                                      dict_t *resp_dict, char *path_list,
+                                      char *conf_path, gf_boolean_t is_force)
 {
 
         int                    ret = 0;
-        uuid_t                 uuid = {0, };
         glusterd_conf_t        *priv = NULL;
         char                   *status_msg = NULL;
+        gf_boolean_t           is_running = _gf_false;
 
         GF_ASSERT (volinfo);
         GF_ASSERT (slave);
@@ -1637,18 +2807,22 @@ glusterd_check_restart_gsync_session (glusterd_volinfo_t *volinfo, char *slave,
 
         priv = THIS->private;
 
-        if (glusterd_gsync_get_uuid (slave, volinfo, uuid))
-                /* session does not exist, nothing to do */
+        ret = glusterd_check_gsync_running_local (volinfo->volname,
+                                                  slave, conf_path,
+                                                  &is_running);
+        if (!ret && (_gf_true != is_running))
+                /* gsynd not running, nothing to do */
                 goto out;
-        if (uuid_compare (MY_UUID, uuid) == 0) {
-                ret = stop_gsync (volinfo->volname, slave, &status_msg);
-                if (ret == 0 && status_msg)
-                        ret = dict_set_str (resp_dict, "gsync-status",
-                                            status_msg);
-                if (ret == 0)
-                        ret = glusterd_start_gsync (volinfo, slave,
-                                                    uuid_utoa(MY_UUID), NULL);
-        }
+
+        ret = stop_gsync (volinfo->volname, slave, &status_msg,
+                          conf_path, is_force);
+        if (ret == 0 && status_msg)
+                ret = dict_set_str (resp_dict, "gsync-status",
+                                    status_msg);
+        if (ret == 0)
+                ret = glusterd_start_gsync (volinfo, slave, path_list,
+                                            conf_path, uuid_utoa(MY_UUID),
+                                            NULL);
 
  out:
         gf_log ("", GF_LOG_DEBUG, "Returning %d", ret);
@@ -1656,7 +2830,7 @@ glusterd_check_restart_gsync_session (glusterd_volinfo_t *volinfo, char *slave,
 }
 
 static int32_t
-glusterd_marker_create_volfile (glusterd_volinfo_t *volinfo)
+glusterd_marker_changelog_create_volfile (glusterd_volinfo_t *volinfo)
 {
         int32_t          ret     = 0;
 
@@ -1680,58 +2854,82 @@ out:
 }
 
 static int
-glusterd_set_marker_gsync (glusterd_volinfo_t *volinfo)
+glusterd_set_gsync_knob (glusterd_volinfo_t *volinfo, char *key, int *vc)
 {
-        int                      ret     = -1;
-        int                      marker_set = _gf_false;
-        char                    *gsync_status = NULL;
+        int   ret          = -1;
+        int   conf_enabled = _gf_false;
+        char *knob_on      = NULL;
 
         GF_ASSERT (THIS);
         GF_ASSERT (THIS->private);
 
-        marker_set = glusterd_volinfo_get_boolean (volinfo, VKEY_MARKER_XTIME);
-        if (marker_set == -1) {
-                gf_log ("", GF_LOG_ERROR, "failed to get the marker status");
-                ret = -1;
+        conf_enabled = glusterd_volinfo_get_boolean (volinfo, key);
+        if (conf_enabled == -1) {
+                gf_log ("", GF_LOG_ERROR,
+                        "failed to get key %s from volinfo", key);
                 goto out;
         }
 
-        if (marker_set == _gf_false) {
-                gsync_status = gf_strdup ("on");
-                if (gsync_status == NULL) {
+        ret = 0;
+        if (conf_enabled == _gf_false) {
+                *vc = 1;
+                knob_on = gf_strdup ("on");
+                if (knob_on == NULL) {
                         ret = -1;
                         goto out;
                 }
 
                 ret = glusterd_gsync_volinfo_dict_set (volinfo,
-                                                       VKEY_MARKER_XTIME, gsync_status);
-                if (ret < 0)
-                        goto out;
-
-                ret = glusterd_marker_create_volfile (volinfo);
-                if (ret) {
-                        gf_log ("", GF_LOG_ERROR, "Setting dict failed");
-                        goto out;
-                }
+                                                       key, knob_on);
         }
-        ret = 0;
 
-out:
+ out:
         gf_log ("", GF_LOG_DEBUG, "Returning %d", ret);
         return ret;
 }
 
+static int
+glusterd_set_gsync_confs (glusterd_volinfo_t *volinfo)
+{
+        int ret             = -1;
+        int volfile_changed = 0;
 
+        ret = glusterd_set_gsync_knob (volinfo,
+                                       VKEY_MARKER_XTIME, &volfile_changed);
+        if (ret)
+                goto out;
 
+        /**
+         * enable ignore-pid-check blindly as it could be needed for
+         * cascading setups.
+         */
+        ret = glusterd_set_gsync_knob (volinfo, VKEY_MARKER_XTIME_FORCE,
+                                       &volfile_changed);
+        if (ret)
+                goto out;
+
+        ret = glusterd_set_gsync_knob (volinfo,
+                                       VKEY_CHANGELOG, &volfile_changed);
+        if (ret)
+                goto out;
+
+        if (volfile_changed)
+                ret = glusterd_marker_changelog_create_volfile (volinfo);
+
+ out:
+        return ret;
+}
 
 static int
 glusterd_get_gsync_status_mst_slv (glusterd_volinfo_t *volinfo,
-                                   char *slave, dict_t *rsp_dict,
-                                   char *node)
+                                   char *slave, char *conf_path,
+                                   dict_t *rsp_dict, char *node)
 {
+        char              *statefile = NULL;
         uuid_t             uuid = {0, };
         glusterd_conf_t    *priv = NULL;
         int                ret = 0;
+        struct stat        stbuf = {0, };
 
         GF_ASSERT (volinfo);
         GF_ASSERT (slave);
@@ -1741,19 +2939,38 @@ glusterd_get_gsync_status_mst_slv (glusterd_volinfo_t *volinfo,
         priv = THIS->private;
 
         ret = glusterd_gsync_get_uuid (slave, volinfo, uuid);
-        if ((ret == 0) && (uuid_compare (MY_UUID, uuid) != 0))
-                goto out;
-
         if (ret) {
-                ret = 0;
                 gf_log ("", GF_LOG_INFO, "geo-replication status %s %s :"
                         "session is not active", volinfo->volname, slave);
-                goto out;
+
+                ret = glusterd_get_statefile_name (volinfo, slave,
+                                                   conf_path, &statefile);
+                if (ret) {
+                        if (!strstr(slave, "::"))
+                                gf_log ("", GF_LOG_INFO,
+                                        "%s is not a valid slave url.", slave);
+                        else
+                                gf_log ("", GF_LOG_INFO, "Unable to get"
+                                        " statefile's name");
+                        ret = 0;
+                        goto out;
+                }
+
+                ret = lstat (statefile, &stbuf);
+                if (ret) {
+                        gf_log ("", GF_LOG_INFO, "%s statefile not present.",
+                                statefile);
+                        ret = 0;
+                        goto out;
+                }
         }
 
-        ret = glusterd_read_status_file (volinfo->volname,
-                                         slave, rsp_dict, node);
- out:
+        ret = glusterd_read_status_file (volinfo, slave, conf_path,
+                                         rsp_dict, node);
+out:
+        if (statefile)
+                GF_FREE (statefile);
+
         gf_log ("", GF_LOG_DEBUG, "Returning with %d", ret);
         return ret;
 }
@@ -1804,6 +3021,7 @@ glusterd_get_gsync_status (dict_t *dict, char **op_errstr, dict_t *rsp_dict)
 {
         char               *slave  = NULL;
         char               *volname = NULL;
+        char               *conf_path = NULL;
         char               errmsg[PATH_MAX] = {0, };
         gf_boolean_t       exists = _gf_false;
         glusterd_volinfo_t *volinfo = NULL;
@@ -1841,7 +3059,14 @@ glusterd_get_gsync_status (dict_t *dict, char **op_errstr, dict_t *rsp_dict)
                 goto out;
         }
 
-        ret = glusterd_get_gsync_status_mst_slv (volinfo, slave,
+        ret = dict_get_str (dict, "conf_path", &conf_path);
+        if (ret) {
+                gf_log ("", GF_LOG_ERROR,
+                        "Unable to fetch conf file path.");
+                goto out;
+        }
+
+        ret = glusterd_get_gsync_status_mst_slv (volinfo, slave, conf_path,
                                                  rsp_dict, my_hostname);
 
  out:
@@ -1850,300 +3075,406 @@ glusterd_get_gsync_status (dict_t *dict, char **op_errstr, dict_t *rsp_dict)
 }
 
 static int
-glusterd_send_sigstop (pid_t pid)
+glusterd_gsync_delete (glusterd_volinfo_t *volinfo, char *slave, char *slave_ip,
+                       char *slave_vol, char *path_list, dict_t *dict,
+                       dict_t *resp_dict, char **op_errstr)
 {
-        int ret = 0;
-        ret = kill (pid, SIGSTOP);
-        if (ret)
-                gf_log ("", GF_LOG_ERROR, GEOREP"failed to send SIGSTOP signal");
-        return ret;
-}
-
-static int
-glusterd_send_sigcont (pid_t pid)
-{
-        int ret = 0;
-        ret = kill (pid, SIGCONT);
-        if (ret)
-                gf_log ("", GF_LOG_ERROR, GEOREP"failed to send SIGCONT signal");
-        return ret;
-}
-
-/*
- * Log rotations flow is something like this:
- * - Send SIGSTOP to process group (this will stop monitor/worker process
- *   and also the slave if it's local)
- * - Rotate log file for monitor/worker
- * - Rotate log file for slave if it's local
- * - Send SIGCONT to the process group. Monitor wakes up, kills the worker
- *   (this is done in the SIGCONT handler), which results in the termination
- *   of the slave (local/remote). After returning from signal handler,
- *   monitor detects absence of worker and starts it again, which in-turn
- *   starts the slave.
- */
-static int
-glusterd_send_log_rotate_signal (pid_t pid, char *logfile1, char *logfile2)
-{
-        int         ret         = 0;
-        char rlogfile[PATH_MAX] = {0,};
-        time_t      rottime     = 0;
-
-        ret = glusterd_send_sigstop (-pid);
-        rottime = time (NULL);
+        int32_t         ret     = -1;
+        runner_t        runner    = {0,};
+        glusterd_conf_t *priv   = NULL;
+        char            *master = NULL;
+        char            *gl_workdir = NULL;
+        char             geo_rep_dir[PATH_MAX] = "";
+        char            *conf_path = NULL;
 
-        snprintf (rlogfile, sizeof (rlogfile), "%s.%"PRIu64, logfile1,
-                  (uint64_t) rottime);
-        ret = rename (logfile1, rlogfile);
-        if (ret)
-                gf_log ("", GF_LOG_ERROR, "rename failed for geo-rep log file");
+        GF_ASSERT (slave);
+        GF_ASSERT (slave_ip);
+        GF_ASSERT (slave_vol);
+        GF_ASSERT (op_errstr);
+        GF_ASSERT (dict);
+        GF_ASSERT (resp_dict);
 
-        if (!*logfile2) {
-                gf_log ("", GF_LOG_DEBUG, "Slave is not local,"
-                        " skipping rotation");
-                ret = 0;
+        if (THIS)
+                priv = THIS->private;
+        if (priv == NULL) {
+                gf_log ("", GF_LOG_ERROR, "priv of glusterd not present");
+                *op_errstr = gf_strdup ("glusterd defunct");
                 goto out;
         }
 
-        (void) snprintf (rlogfile, sizeof (rlogfile), "%s.%"PRIu64, logfile2,
-                         (uint64_t) rottime);
-        ret = rename (logfile2, rlogfile);
-        if (ret)
-                gf_log ("", GF_LOG_ERROR, "rename failed for geo-rep slave"
-                        " log file");
+        ret = dict_get_str (dict, "conf_path", &conf_path);
+        if (ret) {
+                gf_log ("", GF_LOG_ERROR,
+                        "Unable to fetch conf file path.");
+                goto out;
+        }
 
- out:
-        ret = glusterd_send_sigcont (-pid);
+        gl_workdir = priv->workdir;
+        master = "";
+        runinit (&runner);
+        runner_add_args  (&runner, GSYNCD_PREFIX"/gsyncd",
+                          "--delete", "-c", NULL);
+        runner_argprintf (&runner, "%s", conf_path);
 
-        return ret;
-}
+        if (volinfo) {
+                master = volinfo->volname;
+                runner_argprintf (&runner, ":%s", master);
+        }
+        runner_add_arg (&runner, slave);
+        runner_redir (&runner, STDOUT_FILENO, RUN_PIPE);
+        synclock_unlock (&priv->big_lock);
+        ret = runner_run (&runner);
+        synclock_lock (&priv->big_lock);
+        if (ret) {
+                gf_log ("", GF_LOG_ERROR, "gsyncd failed to "
+                        "delete session info for %s and %s peers",
+                        master, slave);
 
-static int
-glusterd_get_pid_from_file (char *master, char *slave, pid_t *pid)
-{
-        int ret                = -1;
-        int pfd                = 0;
-        char pidfile[PATH_MAX] = {0,};
-        char buff[1024]        = {0,};
+                gf_asprintf (op_errstr, "gsyncd failed to "
+                             "delete session info for %s and %s peers",
+                             master, slave);
 
-        pfd = gsyncd_getpidfile (master, slave, pidfile);
-        if (pfd == -2) {
-                gf_log ("", GF_LOG_ERROR, GEOREP" log-rotate validation "
-                        " failed for %s & %s", master, slave);
-                goto out;
-        }
-        if (gsync_status_byfd (pfd) == -1) {
-                gf_log ("", GF_LOG_ERROR, "gsyncd b/w %s & %s is not"
-                        " running", master, slave);
                 goto out;
         }
 
-        if (pfd < 0)
-                goto out;
+        ret = snprintf (geo_rep_dir, sizeof(geo_rep_dir) - 1,
+                        "%s/"GEOREP"/%s_%s_%s", gl_workdir,
+                        volinfo->volname, slave_ip, slave_vol);
+        geo_rep_dir[ret] = '\0';
 
-        ret = read (pfd, buff, 1024);
-        if (ret < 0) {
-                gf_log ("", GF_LOG_ERROR, GEOREP" cannot read pid from pid-file");
-                goto out;
+        ret = rmdir (geo_rep_dir);
+        if (ret) {
+                if (errno == ENOENT)
+                        gf_log ("", GF_LOG_DEBUG, "Geo Rep Dir(%s) Not Present.",
+                                geo_rep_dir);
+                else {
+                        gf_log ("", GF_LOG_ERROR, "Unable to delete "
+                                "Geo Rep Dir(%s). Error: %s", geo_rep_dir,
+                                strerror (errno));
+                        goto out;
+                }
         }
 
-
-        *pid = strtol (buff, NULL, 10);
         ret = 0;
 
+        gf_asprintf (op_errstr, "delete successful");
+
 out:
-        sys_close(pfd);
+        gf_log ("", GF_LOG_DEBUG, "Returning %d", ret);
         return ret;
 }
 
-static int
-glusterd_do_gsync_log_rotate (char *master, char *slave, uuid_t *uuid, char **op_errstr)
+int
+glusterd_op_sys_exec (dict_t *dict, char **op_errstr, dict_t *rsp_dict)
 {
-        int              ret     = 0;
-        glusterd_conf_t *priv    = NULL;
-        pid_t            pid     = 0;
-        char log_file1[PATH_MAX] = {0,};
-        char log_file2[PATH_MAX] = {0,};
-
-        GF_ASSERT (THIS);
-        GF_ASSERT (THIS->private);
+        char                   buf[PATH_MAX]          = "";
+        char                   cmd_arg_name[PATH_MAX] = "";
+        char                   output_name[PATH_MAX]  = "";
+        char                   errmsg[PATH_MAX]       = "";
+        char                  *ptr                    = NULL;
+        char                  *bufp                   = NULL;
+        char                  *command                = NULL;
+        char                 **cmd_args               = NULL;
+        int                    ret                    = -1;
+        int                    i                      = -1;
+        int                    cmd_args_count         = 0;
+        int                    output_count           = 0;
+        glusterd_conf_t       *priv                   = NULL;
+        runner_t               runner                 = {0,};
 
-        priv = THIS->private;
+        GF_ASSERT (dict);
+        GF_ASSERT (op_errstr);
+        GF_ASSERT (rsp_dict);
 
-        ret = glusterd_get_pid_from_file (master, slave, &pid);
-        if (ret)
+        if (THIS)
+                priv = THIS->private;
+        if (priv == NULL) {
+                gf_log ("", GF_LOG_ERROR, "priv of glusterd not present");
+                *op_errstr = gf_strdup ("glusterd defunct");
                 goto out;
+        }
 
-        /* log file */
-        ret = glusterd_gsyncd_getlogfile (master, slave, log_file1);
-        if (ret)
+        ret = dict_get_str (dict, "command", &command);
+        if (ret) {
+                gf_log ("", GF_LOG_ERROR,
+                        "Unable to get command from dict");
                 goto out;
+        }
 
-        /* check if slave is local or remote */
-        ret = glusterd_gsync_slave_is_remote (slave);
-        if (ret)
-                goto do_rotate;
-
-        /* slave log file - slave is local and it's log can be rotated */
-        ret = glusterd_gsync_get_slave_log_file (master, slave, log_file2);
+        ret = dict_get_int32 (dict, "cmd_args_count", &cmd_args_count);
         if (ret)
-                goto out;
-
- do_rotate:
-        ret = glusterd_send_log_rotate_signal (pid, log_file1, log_file2);
-
- out:
-        if (ret && op_errstr)
-                *op_errstr = gf_strdup("Error rotating log file");
-        return ret;
-}
-
-static int
-glusterd_do_gsync_log_rotation_mst_slv (glusterd_volinfo_t *volinfo, char *slave,
-                                        char **op_errstr)
-{
-        uuid_t           uuid = {0, };
-        glusterd_conf_t *priv = NULL;
-        int              ret  = 0;
-        char             errmsg[1024] = {0,};
-        xlator_t        *this    = NULL;
+                gf_log ("", GF_LOG_INFO, "No cmd_args_count");
+
+        if (cmd_args_count) {
+                cmd_args = GF_CALLOC (cmd_args_count, sizeof (char*),
+                                      gf_common_mt_char);
+                if (!cmd_args) {
+                        gf_log ("", GF_LOG_ERROR, "Unable to calloc. "
+                                "Errno = %s", strerror(errno));
+                        goto out;
+                }
 
-        GF_ASSERT (volinfo);
-        GF_ASSERT (slave);
-        GF_ASSERT (THIS);
-        this = THIS;
-        GF_ASSERT (this->private);
-        priv = this->private;
+                for (i=1; i <= cmd_args_count; i++) {
+                        memset (cmd_arg_name, '\0', sizeof(cmd_arg_name));
+                        snprintf (cmd_arg_name, sizeof(cmd_arg_name),
+                                  "cmd_arg_%d", i);
+                        ret = dict_get_str (dict, cmd_arg_name, &cmd_args[i-1]);
+                        if (ret) {
+                                gf_log ("", GF_LOG_ERROR,
+                                        "Unable to get %s in dict",
+                                        cmd_arg_name);
+                                goto out;
+                        }
+                }
+        }
 
-        ret = glusterd_gsync_get_uuid (slave, volinfo, uuid);
-        if ((ret == 0) && (uuid_compare (MY_UUID, uuid) != 0))
+        runinit (&runner);
+        runner_argprintf (&runner, GSYNCD_PREFIX"/peer_%s", command);
+        for (i=0; i < cmd_args_count; i++)
+                runner_add_arg (&runner, cmd_args[i]);
+        runner_redir (&runner, STDOUT_FILENO, RUN_PIPE);
+        synclock_unlock (&priv->big_lock);
+        ret = runner_start (&runner);
+        if (ret == -1) {
+                snprintf (errmsg, sizeof (errmsg), "Unable to "
+                          "execute command. Error : %s",
+                          strerror (errno));
+                *op_errstr = gf_strdup (errmsg);
+                gf_log ("", GF_LOG_ERROR, "%s", errmsg);
+                ret = -1;
+                synclock_lock (&priv->big_lock);
                 goto out;
+        }
+
+        ptr = fgets(buf, sizeof(buf), runner_chio (&runner, STDOUT_FILENO));
+        if (ptr) {
+                ret = dict_get_int32 (rsp_dict, "output_count", &output_count);
+                if (ret)
+                        output_count = 1;
+                else
+                        output_count++;
+                memset (output_name, '\0', sizeof (output_name));
+                snprintf (output_name, sizeof (output_name),
+                          "output_%d", output_count);
+                if (buf[strlen(buf) - 1] == '\n')
+                        buf[strlen(buf) - 1] = '\0';
+                bufp = gf_strdup (buf);
+                if (!bufp)
+                        gf_log ("", GF_LOG_ERROR, "gf_strdup failed.");
+                ret = dict_set_dynstr (rsp_dict, output_name, bufp);
+                if (ret) {
+                        GF_FREE (bufp);
+                        gf_log ("", GF_LOG_ERROR, "output set failed.");
+                }
+                ret = dict_set_int32 (rsp_dict, "output_count", output_count);
+                if (ret)
+                        gf_log ("", GF_LOG_ERROR, "output_count set failed.");
+        }
 
+        ret = runner_end (&runner);
         if (ret) {
-                snprintf(errmsg, sizeof(errmsg), "geo-replication session b/w %s %s not active",
-                         volinfo->volname, slave);
-                gf_log (this->name, GF_LOG_WARNING, "%s", errmsg);
-                if (op_errstr)
-                        *op_errstr = gf_strdup(errmsg);
+                snprintf (errmsg, sizeof (errmsg), "Unable to "
+                          "end. Error : %s",
+                          strerror (errno));
+                *op_errstr = gf_strdup (errmsg);
+                gf_log ("", GF_LOG_ERROR, "%s", errmsg);
+                ret = -1;
+                synclock_lock (&priv->big_lock);
                 goto out;
         }
+        synclock_lock (&priv->big_lock);
 
-        ret = glusterd_do_gsync_log_rotate (volinfo->volname, slave, &uuid, op_errstr);
+        ret = 0;
+out:
+        if (cmd_args) {
+                GF_FREE (cmd_args);
+                cmd_args = NULL;
+        }
 
- out:
-        gf_log (this->name, GF_LOG_DEBUG, "Returning with %d", ret);
+        gf_log ("", GF_LOG_DEBUG, "Returning %d", ret);
         return ret;
 }
 
-static int
-_iterate_log_rotate_mst_slv (dict_t *this, char *key, data_t *value, void *data)
+int
+glusterd_op_copy_file (dict_t *dict, char **op_errstr)
 {
-        glusterd_gsync_status_temp_t  *param = NULL;
-        char                          *slave = NULL;
+        char             abs_filename[PATH_MAX] = "";
+        char             errmsg[PATH_MAX]       = "";
+        char            *filename               = NULL;
+        char            *host_uuid              = NULL;
+        char             uuid_str [64]          = {0};
+        char            *contents               = NULL;
+        char             buf[1024]              = "";
+        int              ret                    = -1;
+        int              fd                     = -1;
+        int              bytes_writen           = 0;
+        int              bytes_read             = 0;
+        int              contents_size          = -1;
+        int              file_mode              = -1;
+        glusterd_conf_t *priv                   = NULL;
+        struct stat      stbuf                  = {0,};
 
-        param = (glusterd_gsync_status_temp_t *) data;
 
-        GF_ASSERT (param);
-        GF_ASSERT (param->volinfo);
-
-        slave = strchr (value->data, ':');
-        if (slave)
-                slave++;
-        else {
-                gf_log ("", GF_LOG_ERROR, "geo-replication log-rotate: slave (%s) "
-                        "not conforming to format", slave);
-                return -1;
+        if (THIS)
+                priv = THIS->private;
+        if (priv == NULL) {
+                gf_log ("", GF_LOG_ERROR, "priv of glusterd not present");
+                *op_errstr = gf_strdup ("glusterd defunct");
+                goto out;
         }
 
-        (void) glusterd_do_gsync_log_rotation_mst_slv (param->volinfo, slave, NULL);
-        return 0;
-}
+        ret = dict_get_str (dict, "host-uuid", &host_uuid);
+        if (ret < 0)
+                goto out;
 
-static int
-glusterd_do_gsync_log_rotation_mst (glusterd_volinfo_t *volinfo)
-{
-        glusterd_gsync_status_temp_t  param = {0, };
+        ret = dict_get_str (dict, "source", &filename);
+        if (ret < 0) {
+               gf_log ("", GF_LOG_ERROR, "Unable to fetch"
+                       " filename from dict.");
+               *op_errstr = gf_strdup ("command unsuccessful");
+               goto out;
+        }
+        snprintf (abs_filename, sizeof(abs_filename),
+                  "%s/%s", priv->workdir, filename);
 
-        GF_ASSERT (volinfo);
+        uuid_utoa_r (MY_UUID, uuid_str);
+        if (!strcmp (uuid_str, host_uuid)) {
+                ret = lstat (abs_filename, &stbuf);
+                if (ret) {
+                        snprintf (errmsg, sizeof (errmsg), "Source file"
+                                 " does not exist in %s", priv->workdir);
+                        *op_errstr = gf_strdup (errmsg);
+                        gf_log ("", GF_LOG_ERROR, "%s", errmsg);
+                        goto out;
+                }
 
-        param.volinfo = volinfo;
-        dict_foreach (volinfo->gsync_slaves, _iterate_log_rotate_mst_slv, &param);
-        return 0;
-}
+                contents = GF_CALLOC(1, stbuf.st_size+1, gf_common_mt_char);
+                if (!contents) {
+                        snprintf (errmsg, sizeof (errmsg),
+                                  "Unable to allocate memory");
+                        *op_errstr = gf_strdup (errmsg);
+                        gf_log ("", GF_LOG_ERROR, "%s", errmsg);
+                        ret = -1;
+                        goto out;
+                }
 
-static int
-glusterd_rotate_gsync_all ()
-{
-        int32_t             ret     = 0;
-        glusterd_conf_t    *priv    = NULL;
-        glusterd_volinfo_t *volinfo = NULL;
+                fd = open (abs_filename, O_RDONLY);
+                if (fd < 0) {
+                        snprintf (errmsg, sizeof (errmsg), "Unable to open %s",
+                                  abs_filename);
+                        *op_errstr = gf_strdup (errmsg);
+                        gf_log ("", GF_LOG_ERROR, "%s", errmsg);
+                        ret = -1;
+                        goto out;
+                }
 
-        GF_ASSERT (THIS);
-        priv = THIS->private;
+                do {
+                        ret = read (fd, buf, sizeof(buf));
+                        if (ret > 0) {
+                                memcpy (contents+bytes_read, buf, ret);
+                                bytes_read += ret;
+                                memset (buf, '\0', sizeof(buf));
+                        }
+                } while (ret > 0);
 
-        GF_ASSERT (priv);
+                if (bytes_read != stbuf.st_size) {
+                        snprintf (errmsg, sizeof (errmsg), "Unable to read all "
+                                  "the data from %s", abs_filename);
+                        *op_errstr = gf_strdup (errmsg);
+                        gf_log ("", GF_LOG_ERROR, "%s", errmsg);
+                        ret = -1;
+                        goto out;
+                }
 
-        list_for_each_entry (volinfo, &priv->volumes, vol_list) {
-                ret = glusterd_do_gsync_log_rotation_mst (volinfo);
-                if (ret)
+                ret = dict_set_int32 (dict, "contents_size", stbuf.st_size);
+                if (ret) {
+                        snprintf (errmsg, sizeof (errmsg), "Unable to set"
+                                  " contents size in dict.");
+                        *op_errstr = gf_strdup (errmsg);
+                        gf_log ("", GF_LOG_ERROR, "%s", errmsg);
                         goto out;
-        }
+                }
 
- out:
-        gf_log ("", GF_LOG_DEBUG, "Returning with %d", ret);
-        return ret;
-}
+                ret = dict_set_int32 (dict, "file_mode",
+                                      (int32_t)stbuf.st_mode);
+                if (ret) {
+                        snprintf (errmsg, sizeof (errmsg), "Unable to set"
+                                  " file mode in dict.");
+                        *op_errstr = gf_strdup (errmsg);
+                        gf_log ("", GF_LOG_ERROR, "%s", errmsg);
+                        goto out;
+                }
 
-static int
-glusterd_rotate_gsync_logs (dict_t *dict, char **op_errstr, dict_t *rsp_dict)
-{
-        char                *slave   = NULL;
-        char                *volname = NULL;
-        char errmsg[1024]            = {0,};
-        gf_boolean_t         exists  = _gf_false;
-        glusterd_volinfo_t  *volinfo = NULL;
-        char               **linearr = NULL;
-        int                  ret     = 0;
+                ret = dict_set_bin (dict, "common_pem_contents",
+                                    contents, stbuf.st_size);
+                if (ret) {
+                        snprintf (errmsg, sizeof (errmsg), "Unable to set"
+                                  " pem contents in dict.");
+                        *op_errstr = gf_strdup (errmsg);
+                        gf_log ("", GF_LOG_ERROR, "%s", errmsg);
+                        goto out;
+                }
+                close (fd);
+        } else {
+                ret = dict_get_bin (dict, "common_pem_contents",
+                                    (void **) &contents);
+                if (ret) {
+                        snprintf (errmsg, sizeof (errmsg), "Unable to get"
+                                  " pem contents in dict.");
+                        *op_errstr = gf_strdup (errmsg);
+                        gf_log ("", GF_LOG_ERROR, "%s", errmsg);
+                        goto out;
+                }
 
-        ret = dict_get_str (dict, "master", &volname);
-        if (ret < 0) {
-                ret = glusterd_rotate_gsync_all ();
-                goto out;
-        }
+                ret = dict_get_int32 (dict, "contents_size", &contents_size);
+                if (ret) {
+                        snprintf (errmsg, sizeof (errmsg), "Unable to set"
+                                  " contents size in dict.");
+                        *op_errstr = gf_strdup (errmsg);
+                        gf_log ("", GF_LOG_ERROR, "%s", errmsg);
+                        goto out;
+                }
 
-        exists = glusterd_check_volume_exists (volname);
-        ret = glusterd_volinfo_find (volname, &volinfo);
-        if ((ret) || (!exists)) {
-                snprintf (errmsg, sizeof(errmsg), "Volume %s does not"
-                          " exist", volname);
-                gf_log ("", GF_LOG_WARNING, "%s", errmsg);
-                *op_errstr = gf_strdup (errmsg);
-                ret = -1;
-                goto out;
-        }
+                ret = dict_get_int32 (dict, "file_mode", &file_mode);
+                if (ret) {
+                        snprintf (errmsg, sizeof (errmsg), "Unable to get"
+                                  " file mode in dict.");
+                        *op_errstr = gf_strdup (errmsg);
+                        gf_log ("", GF_LOG_ERROR, "%s", errmsg);
+                        goto out;
+                }
 
-        ret = dict_get_str (dict, "slave", &slave);
-        if (ret < 0) {
-                ret = glusterd_do_gsync_log_rotation_mst (volinfo);
-                goto out;
-        }
+                fd = open (abs_filename, O_WRONLY | O_TRUNC | O_CREAT, 0600);
+                if (fd < 0) {
+                        snprintf (errmsg, sizeof (errmsg), "Unable to open %s",
+                                  abs_filename);
+                        *op_errstr = gf_strdup (errmsg);
+                        gf_log ("", GF_LOG_ERROR, "%s", errmsg);
+                        ret = -1;
+                        goto out;
+                }
 
-        /* for the given slave use the normalized url */
-        ret = glusterd_urltransform_single (slave, "normalize", &linearr);
-        if (ret == -1)
-                goto out;
+                bytes_writen = write (fd, contents, contents_size);
 
-        ret = glusterd_do_gsync_log_rotation_mst_slv (volinfo, linearr[0],
-                                                      op_errstr);
-        if (ret)
-                gf_log ("gsyncd", GF_LOG_ERROR, "gsyncd log-rotate failed for"
-                        " %s & %s", volname, slave);
+                if (bytes_writen != contents_size) {
+                        snprintf (errmsg, sizeof (errmsg), "Failed to write"
+                                  " to %s", abs_filename);
+                        *op_errstr = gf_strdup (errmsg);
+                        gf_log ("", GF_LOG_ERROR, "%s", errmsg);
+                        ret = -1;
+                        goto out;
+                }
 
-        glusterd_urltransform_free (linearr, 1);
- out:
+                fchmod (fd, file_mode);
+                close (fd);
+        }
+
+        ret = 0;
+out:
+        gf_log ("", GF_LOG_DEBUG, "Returning %d", ret);
         return ret;
 }
 
-
 int
 glusterd_op_gsync_set (dict_t *dict, char **op_errstr, dict_t *rsp_dict)
 {
@@ -2153,11 +3484,16 @@ glusterd_op_gsync_set (dict_t *dict, char **op_errstr, dict_t *rsp_dict)
         dict_t             *resp_dict = NULL;
         char               *host_uuid = NULL;
         char               *slave  = NULL;
+        char               *slave_ip  = NULL;
+        char               *slave_vol = NULL;
         char               *volname = NULL;
+        char               *path_list = NULL;
         glusterd_volinfo_t *volinfo = NULL;
         glusterd_conf_t    *priv = NULL;
+        gf_boolean_t        is_force = _gf_false;
         char               *status_msg = NULL;
-        uuid_t              uuid = {0, };
+        gf_boolean_t        is_running = _gf_false;
+        char               *conf_path = NULL;
 
         GF_ASSERT (THIS);
         GF_ASSERT (THIS->private);
@@ -2183,15 +3519,28 @@ glusterd_op_gsync_set (dict_t *dict, char **op_errstr, dict_t *rsp_dict)
                 goto out;
         }
 
-        if (type == GF_GSYNC_OPTION_TYPE_ROTATE) {
-                ret = glusterd_rotate_gsync_logs (dict, op_errstr, resp_dict);
+        ret = dict_get_str (dict, "slave", &slave);
+        if (ret < 0)
                 goto out;
 
+        ret = dict_get_str (dict, "slave_ip", &slave_ip);
+        if (ret) {
+                gf_log ("", GF_LOG_ERROR, "Unable to fetch slave volume name.");
+                goto out;
         }
 
-        ret = dict_get_str (dict, "slave", &slave);
-        if (ret < 0)
+        ret = dict_get_str (dict, "slave_vol", &slave_vol);
+        if (ret) {
+                gf_log ("", GF_LOG_ERROR, "Unable to fetch slave volume name.");
                 goto out;
+        }
+
+        ret = dict_get_str (dict, "conf_path", &conf_path);
+        if (ret) {
+                gf_log ("", GF_LOG_ERROR,
+                        "Unable to fetch conf file path.");
+                goto out;
+        }
 
         if (dict_get_str (dict, "master", &volname) == 0) {
                 ret = glusterd_volinfo_find (volname, &volinfo);
@@ -2200,11 +3549,31 @@ glusterd_op_gsync_set (dict_t *dict, char **op_errstr, dict_t *rsp_dict)
                                 volname);
                         goto out;
                 }
+
+                ret = glusterd_get_local_brickpaths (volinfo, &path_list);
         }
 
         if (type == GF_GSYNC_OPTION_TYPE_CONFIG) {
-                ret = glusterd_gsync_configure (volinfo, slave, dict, resp_dict,
-                                                op_errstr);
+                ret = glusterd_gsync_configure (volinfo, slave, path_list,
+                                                dict, resp_dict, op_errstr);
+
+                ret = dict_set_str (resp_dict, "conf_path", conf_path);
+                if (ret) {
+                        gf_log ("", GF_LOG_ERROR,
+                                "Unable to store conf_file_path.");
+                        goto out;
+                }
+                goto out;
+        }
+
+        if (type == GF_GSYNC_OPTION_TYPE_DELETE) {
+                ret = glusterd_remove_slave_in_info(volinfo, slave, op_errstr);
+                if (ret && !is_force && path_list)
+                        goto out;
+
+                ret = glusterd_gsync_delete (volinfo, slave, slave_ip,
+                                             slave_vol, path_list, dict,
+                                             resp_dict, op_errstr);
                 goto out;
         }
 
@@ -2213,48 +3582,652 @@ glusterd_op_gsync_set (dict_t *dict, char **op_errstr, dict_t *rsp_dict)
                 goto out;
         }
 
+        is_force = dict_get_str_boolean (dict, "force", _gf_false);
+
         if (type == GF_GSYNC_OPTION_TYPE_START) {
 
-                ret = glusterd_set_marker_gsync (volinfo);
+                ret = glusterd_set_gsync_confs (volinfo);
                 if (ret != 0) {
-                        gf_log ("", GF_LOG_WARNING, "marker start failed");
+                        gf_log ("", GF_LOG_WARNING, "marker/changelog start failed");
                         *op_errstr = gf_strdup ("failed to initialize indexing");
                         ret = -1;
                         goto out;
                 }
-                ret = glusterd_store_slave_in_info(volinfo, slave,
-                                                   host_uuid, op_errstr);
-                if (ret)
-                        goto out;
 
-                ret = glusterd_start_gsync (volinfo, slave, host_uuid,
-                                            op_errstr);
+                ret = glusterd_start_gsync (volinfo, slave, path_list,
+                                            conf_path, host_uuid, op_errstr);
         }
 
         if (type == GF_GSYNC_OPTION_TYPE_STOP) {
-
-                ret = glusterd_gsync_get_uuid (slave, volinfo, uuid);
-                if (ret) {
+                ret = glusterd_check_gsync_running_local (volinfo->volname,
+                                                          slave, conf_path,
+                                                          &is_running);
+                if (!ret && !is_force && path_list &&
+                    (_gf_true != is_running)) {
                         gf_log ("", GF_LOG_WARNING, GEOREP" is not set up for"
                                 "%s(master) and %s(slave)", volname, slave);
                         *op_errstr = strdup (GEOREP" is not set up");
                         goto out;
                 }
 
-                ret = glusterd_remove_slave_in_info(volinfo, slave, op_errstr);
-                if (ret)
+                ret = stop_gsync (volname, slave, &status_msg, conf_path, is_force);
+                if (ret == 0 && status_msg)
+                        ret = dict_set_str (resp_dict, "gsync-status",
+                                            status_msg);
+                if (ret != 0 && !is_force && path_list)
+                        *op_errstr = gf_strdup ("internal error");
+
+                if (!ret) {
+                        ret = glusterd_create_status_file (volinfo->volname,
+                                                           slave, slave_ip,
+                                                           slave_vol, "Stopped");
+                        if (ret) {
+                                gf_log ("", GF_LOG_ERROR, "Unable to update"
+                                        "state_file. Error : %s",
+                                        strerror (errno));
+                        }
+                }
+        }
+
+out:
+        if (path_list) {
+                GF_FREE (path_list);
+                path_list = NULL;
+        }
+
+        gf_log ("", GF_LOG_DEBUG, "Returning %d", ret);
+        return ret;
+}
+
+int
+glusterd_get_slave_details_confpath (glusterd_volinfo_t *volinfo, dict_t *dict,
+                                     char **slave_ip, char **slave_vol,
+                                     char **conf_path, char **op_errstr)
+{
+        int                ret                = -1;
+        char               confpath[PATH_MAX] = "";
+        glusterd_conf_t   *priv               = NULL;
+        char              *slave              = NULL;
+
+        GF_ASSERT (THIS);
+        priv = THIS->private;
+        GF_ASSERT (priv);
+
+        ret = dict_get_str (dict, "slave", &slave);
+        if (ret || !slave) {
+                gf_log ("", GF_LOG_ERROR, "Unable to fetch slave from dict");
+                ret = -1;
+                goto out;
+        }
+
+        ret = glusterd_get_slave_info (slave, slave_ip, slave_vol, op_errstr);
+        if (ret) {
+                gf_log ("", GF_LOG_ERROR,
+                        "Unable to fetch slave details.");
+                ret = -1;
+                goto out;
+        }
+
+        ret = dict_set_str (dict, "slave_ip", *slave_ip);
+        if (ret) {
+                gf_log ("", GF_LOG_ERROR,
+                        "Unable to store slave IP.");
+                goto out;
+        }
+
+        ret = dict_set_str (dict, "slave_vol", *slave_vol);
+        if (ret) {
+                gf_log ("", GF_LOG_ERROR,
+                        "Unable to store slave volume name.");
+                goto out;
+        }
+
+        ret = snprintf (confpath, sizeof(confpath) - 1,
+                        "%s/"GEOREP"/%s_%s_%s/gsyncd.conf",
+                        priv->workdir, volinfo->volname,
+                        *slave_ip, *slave_vol);
+        confpath[ret] = '\0';
+        *conf_path = gf_strdup (confpath);
+        if (!(*conf_path)) {
+                gf_log ("", GF_LOG_ERROR,
+                        "Unable to gf_strdup. Error: %s", strerror (errno));
+                ret = -1;
+                goto out;
+        }
+
+        ret = dict_set_str (dict, "conf_path", *conf_path);
+        if (ret) {
+                gf_log ("", GF_LOG_ERROR,
+                        "Unable to store conf_path");
+                goto out;
+        }
+
+out:
+        gf_log ("", GF_LOG_DEBUG,"Returning %d", ret);
+        return ret;
+
+}
+
+static int
+glusterd_get_slave_info (char *slave, char **slave_ip,
+                         char **slave_vol, char **op_errstr)
+{
+        char     *tmp              = NULL;
+        char     *save_ptr         = NULL;
+        char    **linearr          = NULL;
+        int32_t   ret              = -1;
+        char      errmsg[PATH_MAX] = "";
+
+        ret = glusterd_urltransform_single (slave, "normalize",
+                                            &linearr);
+        if (ret == -1) {
+                ret = snprintf (errmsg, sizeof(errmsg) - 1,
+                                "Invalid Url: %s", slave);
+                errmsg[ret] = '\0';
+                *op_errstr = gf_strdup (errmsg);
+                gf_log ("", GF_LOG_ERROR, "Failed to normalize url");
+                goto out;
+        }
+
+        tmp = strtok_r (linearr[0], "/", &save_ptr);
+        tmp = strtok_r (NULL, "/", &save_ptr);
+        slave = strtok_r (tmp, ":", &save_ptr);
+        if (slave) {
+                ret = glusterd_mountbroker_check (&slave, op_errstr);
+                if (ret) {
+                        gf_log ("", GF_LOG_ERROR,
+                                "Invalid slave url: %s", *op_errstr);
                         goto out;
+                }
 
-                if (uuid_compare (MY_UUID, uuid) != 0) {
+                *slave_ip = gf_strdup (slave);
+                if (!*slave_ip) {
+                        gf_log ("", GF_LOG_ERROR,
+                                "Failed to gf_strdup");
+                        ret = -1;
                         goto out;
                 }
+                gf_log ("", GF_LOG_DEBUG, "Slave IP : %s", *slave_ip);
+                ret = 0;
+        } else {
+                gf_log ("", GF_LOG_ERROR, "Invalid slave name");
+                goto out;
+        }
 
-                ret = stop_gsync (volname, slave, &status_msg);
-                if (ret == 0 && status_msg)
-                        ret = dict_set_str (resp_dict, "gsync-status",
-                                            status_msg);
-                if (ret != 0)
-                        *op_errstr = gf_strdup ("internal error");
+        slave = strtok_r (NULL, ":", &save_ptr);
+        if (slave) {
+                *slave_vol = gf_strdup (slave);
+                if (!*slave_vol) {
+                        gf_log ("", GF_LOG_ERROR,
+                                "Failed to gf_strdup");
+                        ret = -1;
+                        goto out;
+                }
+                gf_log ("", GF_LOG_DEBUG, "Slave Vol : %s", *slave_vol);
+                ret = 0;
+        } else {
+                gf_log ("", GF_LOG_ERROR, "Invalid slave name");
+                goto out;
+        }
+
+out:
+        gf_log ("", GF_LOG_DEBUG, "Returning %d", ret);
+        return ret;
+}
+
+static void
+runinit_gsyncd_setrx (runner_t *runner, char *conf_path)
+{
+        runinit (runner);
+        runner_add_args (runner, GSYNCD_PREFIX"/gsyncd", "-c", NULL);
+        runner_argprintf (runner, "%s", conf_path);
+        runner_add_arg (runner, "--config-set-rx");
+}
+
+static int
+glusterd_check_gsync_present (int *valid_state)
+{
+        char                buff[PATH_MAX] = {0, };
+        runner_t            runner = {0,};
+        char               *ptr = NULL;
+        int                 ret = 0;
+
+        runinit (&runner);
+        runner_add_args (&runner, GSYNCD_PREFIX"/gsyncd", "--version", NULL);
+        runner_redir (&runner, STDOUT_FILENO, RUN_PIPE);
+        ret = runner_start (&runner);
+        if (ret == -1) {
+                if (errno == ENOENT) {
+                        gf_log ("glusterd", GF_LOG_INFO, GEOREP
+                                 " module not installed in the system");
+                        *valid_state = 0;
+                }
+                else {
+                        gf_log ("glusterd", GF_LOG_ERROR, GEOREP
+                                  " module not working as desired");
+                        *valid_state = -1;
+                }
+                goto out;
+        }
+
+        ptr = fgets(buff, sizeof(buff), runner_chio (&runner, STDOUT_FILENO));
+        if (ptr) {
+                if (!strstr (buff, "gsyncd")) {
+                        ret = -1;
+                        gf_log ("glusterd", GF_LOG_ERROR, GEOREP" module not "
+                                 "working as desired");
+                        *valid_state = -1;
+                        goto out;
+                }
+        } else {
+                ret = -1;
+                gf_log ("glusterd", GF_LOG_ERROR, GEOREP" module not "
+                         "working as desired");
+                *valid_state = -1;
+                goto out;
+        }
+
+        ret = 0;
+ out:
+
+        runner_end (&runner);
+
+        gf_log ("glusterd", GF_LOG_DEBUG, "Returning %d", ret);
+        return ret;
+
+}
+
+static int
+create_conf_file (glusterd_conf_t *conf, char *conf_path)
+#define RUN_GSYNCD_CMD do {                                                          \
+        ret = runner_run_reuse (&runner);                                            \
+        if (ret == -1) {                                                             \
+                runner_log (&runner, "glusterd", GF_LOG_ERROR, "command failed");    \
+                runner_end (&runner);                                                \
+                goto out;                                                            \
+        }                                                                            \
+        runner_end (&runner);                                                        \
+} while (0)
+{
+        int ret = 0;
+        runner_t runner = {0,};
+        char georepdir[PATH_MAX] = {0,};
+        int valid_state = 0;
+
+        valid_state = -1;
+        ret = glusterd_check_gsync_present (&valid_state);
+        if (-1 == ret) {
+                ret = valid_state;
+                goto out;
+        }
+
+        ret = snprintf (georepdir, sizeof(georepdir) - 1, "%s/"GEOREP,
+                        conf->workdir);
+        georepdir[ret] = '\0';
+
+        /************
+         * master pre-configuration
+         ************/
+
+        /* remote-gsyncd */
+        runinit_gsyncd_setrx (&runner, conf_path);
+        runner_add_args (&runner, "remote-gsyncd", GSYNCD_PREFIX"/gsyncd", ".", ".", NULL);
+        RUN_GSYNCD_CMD;
+
+        runinit_gsyncd_setrx (&runner, conf_path);
+        runner_add_args (&runner, "remote-gsyncd", "/nonexistent/gsyncd",
+                         ".", "^ssh:", NULL);
+        RUN_GSYNCD_CMD;
+
+        /* gluster-command-dir */
+        runinit_gsyncd_setrx (&runner, conf_path);
+        runner_add_args (&runner, "gluster-command-dir", SBIN_DIR"/",
+                         ".", ".", NULL);
+        RUN_GSYNCD_CMD;
+
+        /* gluster-params */
+        runinit_gsyncd_setrx (&runner, conf_path);
+        runner_add_args (&runner, "gluster-params",
+                         "aux-gfid-mount xlator-option=*-dht.assert-no-child-down=true",
+                         ".", ".", NULL);
+        RUN_GSYNCD_CMD;
+
+        /* ssh-command */
+        runinit_gsyncd_setrx (&runner, conf_path);
+        runner_add_arg (&runner, "ssh-command");
+        runner_argprintf (&runner,
+                          "ssh -oPasswordAuthentication=no "
+                           "-oStrictHostKeyChecking=no "
+                           "-i %s/secret.pem", georepdir);
+        runner_add_args (&runner, ".", ".", NULL);
+        RUN_GSYNCD_CMD;
+
+        /* pid-file */
+        runinit_gsyncd_setrx (&runner, conf_path);
+        runner_add_arg (&runner, "pid-file");
+        runner_argprintf (&runner, "%s/${mastervol}_${remotehost}_${slavevol}/${eSlave}.pid", georepdir);
+        runner_add_args (&runner, ".", ".", NULL);
+        RUN_GSYNCD_CMD;
+
+        /* state-file */
+        runinit_gsyncd_setrx (&runner, conf_path);
+        runner_add_arg (&runner, "state-file");
+        runner_argprintf (&runner, "%s/${mastervol}_${remotehost}_${slavevol}/${eSlave}.status", georepdir);
+        runner_add_args (&runner, ".", ".", NULL);
+        RUN_GSYNCD_CMD;
+
+        /* state-detail-file */
+        runinit_gsyncd_setrx (&runner, conf_path);
+        runner_add_arg (&runner, "state-detail-file");
+        runner_argprintf (&runner, "%s/${mastervol}_${remotehost}_${slavevol}/${eSlave}-detail.status", georepdir);
+        runner_add_args (&runner, ".", ".", NULL);
+        RUN_GSYNCD_CMD;
+
+        /* state-socket */
+        runinit_gsyncd_setrx (&runner, conf_path);
+        runner_add_arg (&runner, "state-socket-unencoded");
+        runner_argprintf (&runner, "%s/${mastervol}_${remotehost}_${slavevol}/${eSlave}.socket", georepdir);
+        runner_add_args (&runner, ".", ".", NULL);
+        RUN_GSYNCD_CMD;
+
+        /* socketdir */
+        runinit_gsyncd_setrx (&runner, conf_path);
+        runner_add_args (&runner, "socketdir", GLUSTERD_SOCK_DIR, ".", ".", NULL);
+        RUN_GSYNCD_CMD;
+
+        /* log-file */
+        runinit_gsyncd_setrx (&runner, conf_path);
+        runner_add_args (&runner,
+                         "log-file",
+                         DEFAULT_LOG_FILE_DIRECTORY"/"GEOREP"/${mastervol}/${eSlave}.log",
+                         ".", ".", NULL);
+        RUN_GSYNCD_CMD;
+
+        /* gluster-log-file */
+        runinit_gsyncd_setrx (&runner, conf_path);
+        runner_add_args (&runner,
+                         "gluster-log-file",
+                         DEFAULT_LOG_FILE_DIRECTORY"/"GEOREP"/${mastervol}/${eSlave}${local_id}.gluster.log",
+                         ".", ".", NULL);
+        RUN_GSYNCD_CMD;
+
+        /* ignore-deletes */
+        runinit_gsyncd_setrx (&runner, conf_path);
+        runner_add_args (&runner, "ignore-deletes", "true", ".", ".", NULL);
+        RUN_GSYNCD_CMD;
+
+        /* special-sync-mode */
+        runinit_gsyncd_setrx (&runner, conf_path);
+        runner_add_args (&runner, "special-sync-mode", "partial", ".", ".", NULL);
+        RUN_GSYNCD_CMD;
+
+        /* change-detector == changelog */
+        runinit_gsyncd_setrx (&runner, conf_path);
+        runner_add_args(&runner, "change-detector", "changelog", ".", ".", NULL);
+        RUN_GSYNCD_CMD;
+
+        runinit_gsyncd_setrx (&runner, conf_path);
+        runner_add_arg(&runner, "working-dir");
+        runner_argprintf(&runner, "%s/${mastervol}/${eSlave}",
+                         DEFAULT_VAR_RUN_DIRECTORY);
+        runner_add_args (&runner, ".", ".", NULL);
+        RUN_GSYNCD_CMD;
+
+        /************
+         * slave pre-configuration
+         ************/
+
+        /* gluster-command-dir */
+        runinit_gsyncd_setrx (&runner, conf_path);
+        runner_add_args (&runner, "gluster-command-dir", SBIN_DIR"/",
+                         ".", NULL);
+        RUN_GSYNCD_CMD;
+
+        /* gluster-params */
+        runinit_gsyncd_setrx (&runner, conf_path);
+        runner_add_args (&runner, "gluster-params",
+                         "aux-gfid-mount xlator-option=*-dht.assert-no-child-down=true",
+                         ".", NULL);
+        RUN_GSYNCD_CMD;
+
+        /* log-file */
+        runinit_gsyncd_setrx (&runner, conf_path);
+        runner_add_args (&runner,
+                         "log-file",
+                         DEFAULT_LOG_FILE_DIRECTORY"/"GEOREP"-slaves/${session_owner}:${eSlave}.log",
+                         ".", NULL);
+        RUN_GSYNCD_CMD;
+
+        /* MountBroker log-file */
+        runinit_gsyncd_setrx (&runner, conf_path);
+        runner_add_args (&runner,
+                         "log-file-mbr",
+                         DEFAULT_LOG_FILE_DIRECTORY"/"GEOREP"-slaves/mbr/${session_owner}:${eSlave}.log",
+                         ".", NULL);
+        RUN_GSYNCD_CMD;
+
+        /* gluster-log-file */
+        runinit_gsyncd_setrx (&runner, conf_path);
+        runner_add_args (&runner,
+                         "gluster-log-file",
+                         DEFAULT_LOG_FILE_DIRECTORY"/"GEOREP"-slaves/${session_owner}:${eSlave}.gluster.log",
+                         ".", NULL);
+        RUN_GSYNCD_CMD;
+
+ out:
+        return ret ? -1 : 0;
+}
+
+static int
+glusterd_create_essential_dir_files (glusterd_volinfo_t *volinfo, dict_t *dict,
+                                     char *slave, char *slave_ip,
+                                     char *slave_vol, char **op_errstr)
+{
+        int                ret              = -1;
+        char              *conf_path        = NULL;
+        char              *statefile        = NULL;
+        char               buf[PATH_MAX]    = "";
+        char               errmsg[PATH_MAX] = "";
+        glusterd_conf_t   *conf             = NULL;
+        struct stat        stbuf            = {0,};
+
+        GF_ASSERT (THIS);
+        conf = THIS->private;
+
+        ret = dict_get_str (dict, "conf_path", &conf_path);
+        if (ret) {
+                snprintf (errmsg, sizeof (errmsg),
+                          "Unable to fetch conf file path.");
+                gf_log ("", GF_LOG_ERROR, "%s", errmsg);
+                goto out;
+        }
+
+        ret = dict_get_str (dict, "statefile", &statefile);
+        if (ret) {
+                snprintf (errmsg, sizeof (errmsg),
+                          "Unable to fetch statefile path.");
+                gf_log ("", GF_LOG_ERROR, "%s", errmsg);
+                goto out;
+        }
+
+        ret = snprintf (buf, sizeof(buf) - 1, "%s/"GEOREP"/%s_%s_%s",
+                        conf->workdir, volinfo->volname, slave_ip, slave_vol);
+        buf[ret] = '\0';
+        ret = mkdir_p (buf, 0777, _gf_true);
+        if (ret) {
+                snprintf (errmsg, sizeof (errmsg), "Unable to create %s"
+                          ". Error : %s", buf, strerror (errno));
+                *op_errstr = gf_strdup (errmsg);
+                gf_log ("", GF_LOG_ERROR, "%s", errmsg);
+                goto out;
+        }
+
+        ret = snprintf (buf, PATH_MAX, DEFAULT_LOG_FILE_DIRECTORY"/"GEOREP"/%s",
+                        volinfo->volname);
+        buf[ret] = '\0';
+        ret = mkdir_p (buf, 0777, _gf_true);
+        if (ret) {
+                snprintf (errmsg, sizeof (errmsg), "Unable to create %s"
+                          ". Error : %s", buf, strerror (errno));
+                *op_errstr = gf_strdup (errmsg);
+                gf_log ("", GF_LOG_ERROR, "%s", errmsg);
+                goto out;
+        }
+
+        ret = lstat (conf_path, &stbuf);
+        if (!ret) {
+                gf_log ("", GF_LOG_DEBUG, "Session already running."
+                        " Not creating config file again.");
+        } else {
+                ret = create_conf_file (conf, conf_path);
+                if (ret || lstat (conf_path, &stbuf)) {
+                        snprintf (errmsg, sizeof (errmsg), "Failed to create"
+                                  " config file(%s).", conf_path);
+                        gf_log ("", GF_LOG_ERROR, "%s", errmsg);
+                        goto out;
+                }
+        }
+
+        ret = lstat (statefile, &stbuf);
+        if (!ret) {
+                gf_log ("", GF_LOG_DEBUG, "Session already running."
+                        " Not creating status file again.");
+                goto out;
+        } else {
+                ret = glusterd_create_status_file (volinfo->volname, slave,
+                                                   slave_ip, slave_vol,
+                                                   "Not Started");
+                if (ret || lstat (statefile, &stbuf)) {
+                        snprintf (errmsg, sizeof (errmsg), "Unable to create %s"
+                                  ". Error : %s", statefile, strerror (errno));
+                        *op_errstr = gf_strdup (errmsg);
+                        gf_log ("", GF_LOG_ERROR, "%s", errmsg);
+                        ret = -1;
+                        goto out;
+                }
+        }
+
+out:
+        gf_log ("", GF_LOG_DEBUG,"Returning %d", ret);
+        return ret;
+}
+
+int
+glusterd_op_gsync_create (dict_t *dict, char **op_errstr, dict_t *rsp_dict)
+{
+        char                common_pem_file[PATH_MAX] = "";
+        char                errmsg[PATH_MAX]          = "";
+        char                hooks_args[PATH_MAX]      = "";
+        char                uuid_str [64]             = "";
+        char               *host_uuid                 = NULL;
+        char               *slave_ip                  = NULL;
+        char               *slave_vol                 = NULL;
+        char               *arg_buf                   = NULL;
+        char               *volname                   = NULL;
+        char               *slave                     = NULL;
+        int32_t             ret                       = -1;
+        int32_t             is_pem_push               = -1;
+        gf_boolean_t        is_force                  = -1;
+        glusterd_conf_t    *conf                      = NULL;
+        glusterd_volinfo_t *volinfo                   = NULL;
+
+        GF_ASSERT (THIS);
+        conf = THIS->private;
+        GF_ASSERT (conf);
+        GF_ASSERT (dict);
+        GF_ASSERT (op_errstr);
+
+        ret = glusterd_op_gsync_args_get (dict, op_errstr,
+                                          &volname, &slave, &host_uuid);
+        if (ret)
+                goto out;
+
+        snprintf (common_pem_file, sizeof(common_pem_file),
+                  "%s"GLUSTERD_COMMON_PEM_PUB_FILE, conf->workdir);
+
+        ret = glusterd_volinfo_find (volname, &volinfo);
+        if (ret) {
+                gf_log ("", GF_LOG_ERROR, "Volinfo for %s"
+                        " (master) not found", volname);
+                goto out;
+        }
+
+        ret = dict_get_str (dict, "slave_vol", &slave_vol);
+        if (ret) {
+                snprintf (errmsg, sizeof (errmsg),
+                          "Unable to fetch slave volume name.");
+                gf_log ("", GF_LOG_ERROR, "%s", errmsg);
+                goto out;
+        }
+
+        ret = dict_get_str (dict, "slave_ip", &slave_ip);
+        if (ret) {
+                snprintf (errmsg, sizeof (errmsg),
+                          "Unable to fetch slave IP.");
+                gf_log ("", GF_LOG_ERROR, "%s", errmsg);
+                ret = -1;
+                goto out;
+        }
+
+        is_force = dict_get_str_boolean (dict, "force", _gf_false);
+
+        uuid_utoa_r (MY_UUID, uuid_str);
+        if (!strcmp (uuid_str, host_uuid)) {
+                ret = dict_get_int32 (dict, "push_pem", &is_pem_push);
+                if (!ret && is_pem_push) {
+                        gf_log ("", GF_LOG_DEBUG, "Trying to setup"
+                                " pem files in slave");
+                        is_pem_push = 1;
+                } else
+                        is_pem_push = 0;
+
+                snprintf(hooks_args, sizeof(hooks_args),
+                         "is_push_pem=%d pub_file=%s slave_ip=%s",
+                         is_pem_push, common_pem_file, slave_ip);
+
+        } else
+                snprintf(hooks_args, sizeof(hooks_args),
+                         "This argument will stop the hooks script");
+
+        arg_buf = gf_strdup (hooks_args);
+        if (!arg_buf) {
+                gf_log ("", GF_LOG_ERROR, "Failed to"
+                        " gf_strdup");
+                if (is_force) {
+                        ret = 0;
+                        goto create_essentials;
+                }
+                ret = -1;
+                goto out;
+        }
+
+        ret = dict_set_str (dict, "hooks_args", arg_buf);
+        if (ret) {
+                gf_log ("", GF_LOG_ERROR, "Failed to set"
+                        " hooks_args in dict.");
+                if (is_force) {
+                        ret = 0;
+                        goto create_essentials;
+                }
+                goto out;
+        }
+
+create_essentials:
+
+        ret = glusterd_create_essential_dir_files (volinfo, dict, slave,
+                                                   slave_ip, slave_vol,
+                                                   op_errstr);
+        if (ret)
+                goto out;
+
+        ret = glusterd_store_slave_in_info (volinfo, slave,
+                                            host_uuid, op_errstr,
+                                            is_force);
+        if (ret) {
+                snprintf (errmsg, sizeof (errmsg), "Unable to store"
+                          " slave info.");
+                gf_log ("", GF_LOG_ERROR, "%s", errmsg);
+                goto out;
         }
 
 out:
diff --git a/xlators/mgmt/glusterd/src/glusterd-handler.c b/xlators/mgmt/glusterd/src/glusterd-handler.c
index 328971c2d..71d076624 100644
--- a/xlators/mgmt/glusterd/src/glusterd-handler.c
+++ b/xlators/mgmt/glusterd/src/glusterd-handler.c
@@ -33,6 +33,7 @@
 #include "glusterd-op-sm.h"
 #include "glusterd-utils.h"
 #include "glusterd-store.h"
+#include "glusterd-locks.h"
 
 #include "glusterd1-xdr.h"
 #include "cli1-xdr.h"
@@ -54,6 +55,32 @@
 #include <lvm2app.h>
 #endif
 
+extern uuid_t global_txn_id;
+
+int glusterd_big_locked_notify (struct rpc_clnt *rpc, void *mydata,
+                                rpc_clnt_event_t event,
+                                void *data, rpc_clnt_notify_t notify_fn)
+{
+        glusterd_conf_t *priv = THIS->private;
+        int             ret   = -1;
+        synclock_lock (&priv->big_lock);
+        ret = notify_fn (rpc, mydata, event, data);
+        synclock_unlock (&priv->big_lock);
+        return ret;
+}
+
+int glusterd_big_locked_handler (rpcsvc_request_t *req, rpcsvc_actor actor_fn)
+{
+        glusterd_conf_t *priv = THIS->private;
+        int             ret   = -1;
+
+        synclock_lock (&priv->big_lock);
+        ret = actor_fn (req);
+        synclock_unlock (&priv->big_lock);
+
+        return ret;
+}
+
 static int
 glusterd_handle_friend_req (rpcsvc_request_t *req, uuid_t  uuid,
                             char *hostname, int port,
@@ -75,8 +102,8 @@ glusterd_handle_friend_req (rpcsvc_request_t *req, uuid_t  uuid,
         ret = glusterd_friend_find (uuid, rhost, &peerinfo);
 
         if (ret) {
-                ret = glusterd_xfer_friend_add_resp (req, rhost, port, -1,
-                                                     GF_PROBE_UNKNOWN_PEER);
+                ret = glusterd_xfer_friend_add_resp (req, hostname, rhost, port,
+                                                     -1, GF_PROBE_UNKNOWN_PEER);
                 if (friend_req->vols.vols_val) {
                         free (friend_req->vols.vols_val);
                         friend_req->vols.vols_val = NULL;
@@ -230,13 +257,14 @@ glusterd_add_peer_detail_to_dict (glusterd_peerinfo_t   *peerinfo,
 
         int             ret = -1;
         char            key[256] = {0, };
+        char           *peer_uuid_str = NULL;
 
         GF_ASSERT (peerinfo);
         GF_ASSERT (friends);
 
         snprintf (key, 256, "friend%d.uuid", count);
-        uuid_utoa_r (peerinfo->uuid, peerinfo->uuid_str);
-        ret = dict_set_str (friends, key, peerinfo->uuid_str);
+        peer_uuid_str = gd_peer_uuid_str (peerinfo);
+        ret = dict_set_str (friends, key, peer_uuid_str);
         if (ret)
                 goto out;
 
@@ -310,7 +338,9 @@ glusterd_add_volume_detail_to_dict (glusterd_volinfo_t *volinfo,
         char                    *volume_id_str  = NULL;
         struct args_pack        pack = {0,};
         xlator_t                *this = NULL;
-
+#ifdef HAVE_BD_XLATOR
+        int                     caps = 0;
+#endif
 
         GF_ASSERT (volinfo);
         GF_ASSERT (volumes);
@@ -335,6 +365,21 @@ glusterd_add_volume_detail_to_dict (glusterd_volinfo_t *volinfo,
         if (ret)
                 goto out;
 
+        /* As of now, the snap volumes are also displayed as part of
+           volume info command. So this change is to display whether
+           the volume is original volume or the snap_volume. If
+           displaying of snap volumes in volume info o/p is not needed
+           this should be removed.
+        */
+        snprintf (key, 256, "volume%d.snap_volume", count);
+        ret = dict_set_int32 (volumes, key, volinfo->is_snap_volume);
+        if (ret) {
+                gf_log (this->name, GF_LOG_WARNING, "failed to set whether "
+                        "the volume is a snap volume or actual volume (%s)",
+                        volinfo->volname);
+                goto out;
+        }
+
         snprintf (key, 256, "volume%d.brick_count", count);
         ret = dict_set_int32 (volumes, key, volinfo->brick_count);
         if (ret)
@@ -375,14 +420,76 @@ glusterd_add_volume_detail_to_dict (glusterd_volinfo_t *volinfo,
                 goto out;
 
 #ifdef HAVE_BD_XLATOR
-        snprintf (key, 256, "volume%d.backend", count);
-        ret = dict_set_int32 (volumes, key, volinfo->backend);
-        if (ret)
-                goto out;
+        if (volinfo->caps) {
+                caps = 0;
+                snprintf (key, 256, "volume%d.xlator0", count);
+                buf = GF_MALLOC (256, gf_common_mt_char);
+                if (!buf) {
+                        ret = ENOMEM;
+                        goto out;
+                }
+                if (volinfo->caps & CAPS_BD)
+                        snprintf (buf, 256, "BD");
+                ret = dict_set_dynstr (volumes, key, buf);
+                if (ret) {
+                        GF_FREE (buf);
+                        goto out;
+                }
+
+                if (volinfo->caps & CAPS_THIN) {
+                        snprintf (key, 256, "volume%d.xlator0.caps%d", count,
+                                  caps++);
+                        buf = GF_MALLOC (256, gf_common_mt_char);
+                        if (!buf) {
+                                ret = ENOMEM;
+                                goto out;
+                        }
+                        snprintf (buf, 256, "thin");
+                        ret = dict_set_dynstr (volumes, key, buf);
+                        if (ret) {
+                                GF_FREE (buf);
+                                goto out;
+                        }
+                }
+
+                if (volinfo->caps & CAPS_OFFLOAD_COPY) {
+                        snprintf (key, 256, "volume%d.xlator0.caps%d", count,
+                                  caps++);
+                        buf = GF_MALLOC (256, gf_common_mt_char);
+                        if (!buf) {
+                                ret = ENOMEM;
+                                goto out;
+                        }
+                        snprintf (buf, 256, "offload_copy");
+                        ret = dict_set_dynstr (volumes, key, buf);
+                        if (ret) {
+                                GF_FREE (buf);
+                                goto out;
+                        }
+                }
+
+                if (volinfo->caps & CAPS_OFFLOAD_SNAPSHOT) {
+                        snprintf (key, 256, "volume%d.xlator0.caps%d", count,
+                                  caps++);
+                        buf = GF_MALLOC (256, gf_common_mt_char);
+                        if (!buf) {
+                                ret = ENOMEM;
+                                goto out;
+                        }
+                        snprintf (buf, 256, "offload_snapshot");
+                        ret = dict_set_dynstr (volumes, key, buf);
+                        if (ret)  {
+                                GF_FREE (buf);
+                                goto out;
+                        }
+                }
+
+        }
 #endif
 
         list_for_each_entry (brickinfo, &volinfo->bricks, brick_list) {
                 char    brick[1024] = {0,};
+                char    brick_uuid[64] = {0,};
                 snprintf (key, 256, "volume%d.brick%d", count, i);
                 snprintf (brick, 1024, "%s:%s", brickinfo->hostname,
                           brickinfo->path);
@@ -390,6 +497,25 @@ glusterd_add_volume_detail_to_dict (glusterd_volinfo_t *volinfo,
                 ret = dict_set_dynstr (volumes, key, buf);
                 if (ret)
                         goto out;
+                snprintf (key, 256, "volume%d.brick%d.uuid", count, i);
+                snprintf (brick_uuid, 64, "%s", uuid_utoa (brickinfo->uuid));
+                buf = gf_strdup (brick_uuid);
+                if (!buf)
+                        goto out;
+                ret = dict_set_dynstr (volumes, key, buf);
+                if (ret)
+                        goto out;
+
+#ifdef HAVE_BD_XLATOR
+                if (volinfo->caps & CAPS_BD) {
+                        snprintf (key, 256, "volume%d.vg%d", count, i);
+                        snprintf (brick, 1024, "%s", brickinfo->vg);
+                        buf = gf_strdup (brick);
+                        ret = dict_set_dynstr (volumes, key, buf);
+                        if (ret)
+                                goto out;
+                }
+#endif
                 i++;
         }
 
@@ -453,10 +579,17 @@ int32_t
 glusterd_op_txn_begin (rpcsvc_request_t *req, glusterd_op_t op, void *ctx,
                        char *err_str, size_t err_len)
 {
-        int32_t                  ret    = -1;
-        xlator_t                *this   = NULL;
-        glusterd_conf_t         *priv   = NULL;
-        int32_t                  locked = 0;
+        int32_t                     ret             = -1;
+        dict_t                     *dict            = NULL;
+        xlator_t                   *this            = NULL;
+        glusterd_conf_t            *priv            = NULL;
+        int32_t                     locked          = 0;
+        char                       *tmp             = NULL;
+        char                       *volname         = NULL;
+        uuid_t                     *txn_id          = NULL;
+        uuid_t                     *originator_uuid = NULL;
+        glusterd_op_info_t          txn_op_info     = {{0},};
+        glusterd_op_sm_event_type_t event_type      = GD_OP_EVENT_NONE;
 
         GF_ASSERT (req);
         GF_ASSERT ((op > GD_OP_NONE) && (op < GD_OP_MAX));
@@ -467,46 +600,157 @@ glusterd_op_txn_begin (rpcsvc_request_t *req, glusterd_op_t op, void *ctx,
         priv = this->private;
         GF_ASSERT (priv);
 
-        ret = glusterd_lock (MY_UUID);
+        dict = ctx;
+
+        /* Generate a transaction-id for this operation and
+         * save it in the dict. This transaction id distinguishes
+         * each transaction, and helps separate opinfos in the
+         * op state machine. */
+        txn_id = GF_CALLOC (1, sizeof(uuid_t), gf_common_mt_uuid_t);
+        if (!txn_id)
+                goto out;
+
+        uuid_generate (*txn_id);
+
+        ret = dict_set_bin (dict, "transaction_id",
+                            txn_id, sizeof(*txn_id));
         if (ret) {
                 gf_log (this->name, GF_LOG_ERROR,
-                        "Unable to acquire lock on localhost, ret: %d", ret);
-                snprintf (err_str, err_len, "Another transaction is in progress. "
-                          "Please try again after sometime.");
+                       "Failed to set transaction id.");
                 goto out;
         }
 
+        gf_log (this->name, GF_LOG_DEBUG,
+                "Transaction_id = %s", uuid_utoa (*txn_id));
+
+        /* Save the MY_UUID as the originator_uuid. This originator_uuid
+         * will be used by is_origin_glusterd() to determine if a node
+         * is the originator node for a command. */
+        originator_uuid = GF_CALLOC (1, sizeof(uuid_t),
+                                     gf_common_mt_uuid_t);
+        if (!originator_uuid) {
+                ret = -1;
+                goto out;
+        }
+
+        uuid_copy (*originator_uuid, MY_UUID);
+        ret = dict_set_bin (dict, "originator_uuid",
+                            originator_uuid, sizeof (uuid_t));
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Failed to set originator uuid.");
+                goto out;
+        }
+
+        /* Based on the op_version, acquire a cluster or mgmt_v3 lock */
+        if (priv->op_version < 3) {
+                ret = glusterd_lock (MY_UUID);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Unable to acquire lock on localhost, ret: %d",
+                                ret);
+                        snprintf (err_str, err_len,
+                                  "Another transaction is in progress. "
+                                  "Please try again after sometime.");
+                        goto out;
+                }
+        } else {
+                /* If no volname is given as a part of the command, locks will
+                 * not be held */
+                ret = dict_get_str (dict, "volname", &tmp);
+                if (ret) {
+                        gf_log ("", GF_LOG_ERROR, "Failed to get volume "
+                                "name");
+                        goto local_locking_done;
+                } else {
+                        /* Use a copy of volname, as cli response will be
+                         * sent before the unlock, and the volname in the
+                         * dict, might be removed */
+                        volname = gf_strdup (tmp);
+                        if (!volname)
+                                goto out;
+                }
+
+                ret = glusterd_mgmt_v3_lock (volname, MY_UUID, "vol");
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Unable to acquire lock for %s", volname);
+                        snprintf (err_str, err_len,
+                                  "Another transaction is in progress for %s. "
+                                  "Please try again after sometime.", volname);
+                        goto out;
+                }
+        }
+
         locked = 1;
         gf_log (this->name, GF_LOG_DEBUG, "Acquired lock on localhost");
 
-        ret = glusterd_op_sm_inject_event (GD_OP_EVENT_START_LOCK, NULL);
+local_locking_done:
+
+        /* If no volname is given as a part of the command, locks will
+         * not be held, hence sending stage event. */
+        if (volname)
+                event_type = GD_OP_EVENT_START_LOCK;
+        else {
+                txn_op_info.state.state = GD_OP_STATE_LOCK_SENT;
+                event_type = GD_OP_EVENT_ALL_ACC;
+        }
+
+        /* Save opinfo for this transaction with the transaction id */
+        glusterd_txn_opinfo_init (&txn_op_info, NULL, &op, ctx, req);
+
+        ret = glusterd_set_txn_opinfo (txn_id, &txn_op_info);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Unable to set transaction's opinfo");
+                if (ctx)
+                        dict_unref (ctx);
+                goto out;
+        }
+
+        ret = glusterd_op_sm_inject_event (event_type, txn_id, ctx);
         if (ret) {
                 gf_log (this->name, GF_LOG_ERROR, "Failed to acquire cluster"
                         " lock.");
                 goto out;
         }
 
-        glusterd_op_set_op (op);
-        glusterd_op_set_ctx (ctx);
-        glusterd_op_set_req (req);
-
-
 out:
-        if (locked && ret)
-                glusterd_unlock (MY_UUID);
+        if (locked && ret) {
+                /* Based on the op-version, we release the
+                 * cluster or mgmt_v3 lock */
+                if (priv->op_version < 3)
+                        glusterd_unlock (MY_UUID);
+                else {
+                        ret = glusterd_mgmt_v3_unlock (volname, MY_UUID,
+                                                       "vol");
+                        if (ret)
+                                gf_log (this->name, GF_LOG_ERROR,
+                                        "Unable to release lock for %s",
+                                        volname);
+                        ret = -1;
+                }
+        }
+
+        if (volname)
+                GF_FREE (volname);
 
         gf_log (this->name, GF_LOG_DEBUG, "Returning %d", ret);
         return ret;
 }
 
 int
-glusterd_handle_cluster_lock (rpcsvc_request_t *req)
+__glusterd_handle_cluster_lock (rpcsvc_request_t *req)
 {
-        gd1_mgmt_cluster_lock_req       lock_req = {{0},};
-        int32_t                         ret = -1;
-        glusterd_op_lock_ctx_t          *ctx = NULL;
-        glusterd_peerinfo_t             *peerinfo = NULL;
-        xlator_t                        *this = NULL;
+        dict_t                         *op_ctx      = NULL;
+        int32_t                         ret         = -1;
+        gd1_mgmt_cluster_lock_req       lock_req    = {{0},};
+        glusterd_op_lock_ctx_t         *ctx         = NULL;
+        glusterd_op_t                   op          = GD_OP_EVENT_LOCK;
+        glusterd_peerinfo_t            *peerinfo    = NULL;
+        glusterd_op_info_t              txn_op_info = {{0},};
+        uuid_t                         *txn_id      = &global_txn_id;
+        xlator_t                       *this        = NULL;
 
         this = THIS;
         GF_ASSERT (this);
@@ -541,8 +785,29 @@ glusterd_handle_cluster_lock (rpcsvc_request_t *req)
 
         uuid_copy (ctx->uuid, lock_req.uuid);
         ctx->req = req;
+        ctx->dict = NULL;
+
+        op_ctx =  dict_new ();
+        if (!op_ctx) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Unable to set new dict");
+                goto out;
+        }
+
+        glusterd_txn_opinfo_init (&txn_op_info, NULL, &op, op_ctx, req);
+
+        ret = glusterd_set_txn_opinfo (txn_id, &txn_op_info);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Unable to set transaction's opinfo");
+                dict_unref (txn_op_info.op_ctx);
+                goto out;
+        }
 
-        ret = glusterd_op_sm_inject_event (GD_OP_EVENT_LOCK, ctx);
+        ret = glusterd_op_sm_inject_event (GD_OP_EVENT_LOCK, txn_id, ctx);
+        if (ret)
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Failed to inject event GD_OP_EVENT_LOCK");
 
 out:
         gf_log (this->name, GF_LOG_DEBUG, "Returning %d", ret);
@@ -554,6 +819,13 @@ out:
 }
 
 int
+glusterd_handle_cluster_lock (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req,
+                                            __glusterd_handle_cluster_lock);
+}
+
+int
 glusterd_req_ctx_create (rpcsvc_request_t *rpc_req,
                          glusterd_op_t op, uuid_t uuid,
                          char *buf_val, size_t buf_len,
@@ -604,13 +876,16 @@ out:
 }
 
 int
-glusterd_handle_stage_op (rpcsvc_request_t *req)
+__glusterd_handle_stage_op (rpcsvc_request_t *req)
 {
         int32_t                         ret = -1;
         glusterd_req_ctx_t              *req_ctx = NULL;
         gd1_mgmt_stage_op_req           op_req = {{0},};
         glusterd_peerinfo_t             *peerinfo = NULL;
         xlator_t                        *this = NULL;
+        uuid_t                          *txn_id = &global_txn_id;
+        glusterd_op_info_t              txn_op_info = {{0},};
+        glusterd_op_sm_state_info_t     state;
 
         this = THIS;
         GF_ASSERT (this);
@@ -639,7 +914,36 @@ glusterd_handle_stage_op (rpcsvc_request_t *req)
         if (ret)
                 goto out;
 
-        ret = glusterd_op_sm_inject_event (GD_OP_EVENT_STAGE_OP, req_ctx);
+        ret = dict_get_bin (req_ctx->dict, "transaction_id", (void **)&txn_id);
+
+        gf_log ("", GF_LOG_DEBUG, "transaction ID = %s", uuid_utoa (*txn_id));
+
+        /* In cases where there is no volname, the receivers won't have a
+         * transaction opinfo created, as for those operations, the locking
+         * phase where the transaction opinfos are created, won't be called. */
+        ret = glusterd_get_txn_opinfo (txn_id, &txn_op_info);
+        if (ret) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "No transaction's opinfo set");
+
+                state.state = GD_OP_STATE_LOCKED;
+                glusterd_txn_opinfo_init (&txn_op_info, &state,
+                                          &op_req.op, req_ctx->dict, req);
+
+                ret = glusterd_set_txn_opinfo (txn_id, &txn_op_info);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Unable to set transaction's opinfo");
+                        dict_unref (req_ctx->dict);
+                        goto out;
+                }
+        }
+
+        ret = glusterd_op_sm_inject_event (GD_OP_EVENT_STAGE_OP,
+                                           txn_id, req_ctx);
+        if (ret)
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Failed to inject event GD_OP_EVENT_STAGE_OP");
 
  out:
         free (op_req.buf.buf_val);//malloced by xdr
@@ -649,13 +953,21 @@ glusterd_handle_stage_op (rpcsvc_request_t *req)
 }
 
 int
-glusterd_handle_commit_op (rpcsvc_request_t *req)
+glusterd_handle_stage_op (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req, __glusterd_handle_stage_op);
+}
+
+
+int
+__glusterd_handle_commit_op (rpcsvc_request_t *req)
 {
         int32_t                         ret = -1;
         glusterd_req_ctx_t              *req_ctx = NULL;
         gd1_mgmt_commit_op_req          op_req = {{0},};
         glusterd_peerinfo_t             *peerinfo = NULL;
         xlator_t                        *this = NULL;
+        uuid_t                          *txn_id = &global_txn_id;
 
         this = THIS;
         GF_ASSERT (this);
@@ -686,11 +998,12 @@ glusterd_handle_commit_op (rpcsvc_request_t *req)
         if (ret)
                 goto out;
 
-        ret = glusterd_op_init_ctx (op_req.op);
-        if (ret)
-                goto out;
+        ret = dict_get_bin (req_ctx->dict, "transaction_id", (void **)&txn_id);
 
-        ret = glusterd_op_sm_inject_event (GD_OP_EVENT_COMMIT_OP, req_ctx);
+        gf_log ("", GF_LOG_DEBUG, "transaction ID = %s", uuid_utoa (*txn_id));
+
+        ret = glusterd_op_sm_inject_event (GD_OP_EVENT_COMMIT_OP,
+                                           txn_id, req_ctx);
 
 out:
         free (op_req.buf.buf_val);//malloced by xdr
@@ -700,20 +1013,28 @@ out:
 }
 
 int
-glusterd_handle_cli_probe (rpcsvc_request_t *req)
+glusterd_handle_commit_op (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req, __glusterd_handle_commit_op);
+}
+
+int
+__glusterd_handle_cli_probe (rpcsvc_request_t *req)
 {
         int32_t                         ret = -1;
-        gf1_cli_probe_req               cli_req = {0,};
-        glusterd_peerinfo_t             *peerinfo = NULL;
-        gf_boolean_t                    run_fsm = _gf_true;
-        xlator_t                        *this = NULL;
-        char                            *bind_name = NULL;
+        gf_cli_req                  cli_req = {{0,},};
+        glusterd_peerinfo_t       *peerinfo = NULL;
+        gf_boolean_t                run_fsm = _gf_true;
+        xlator_t                      *this = NULL;
+        char                     *bind_name = NULL;
+        dict_t                        *dict = NULL;
+        char                      *hostname = NULL;
+        int                            port = 0;
 
         GF_ASSERT (req);
         this = THIS;
 
-        ret = xdr_to_generic (req->msg[0], &cli_req,
-                              (xdrproc_t)xdr_gf1_cli_probe_req);
+        ret = xdr_to_generic (req->msg[0], &cli_req, (xdrproc_t)xdr_gf_cli_req);
         if (ret < 0)  {
                 //failed to decode msg;
                 gf_log ("", GF_LOG_ERROR, "xdr decoding error");
@@ -721,63 +1042,80 @@ glusterd_handle_cli_probe (rpcsvc_request_t *req)
                 goto out;
         }
 
+        if (cli_req.dict.dict_len) {
+                dict = dict_new ();
+
+                ret = dict_unserialize (cli_req.dict.dict_val,
+                                        cli_req.dict.dict_len, &dict);
+                if (ret < 0) {
+                        gf_log (this->name, GF_LOG_ERROR, "Failed to "
+                                "unserialize req-buffer to dictionary");
+                        goto out;
+                }
+        }
+
+        ret = dict_get_str (dict, "hostname", &hostname);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to get hostname");
+                goto out;
+        }
+
+        ret = dict_get_int32 (dict, "port", &port);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to get port");
+                goto out;
+        }
+
         if (glusterd_is_any_volume_in_server_quorum (this) &&
             !does_gd_meet_server_quorum (this)) {
                 glusterd_xfer_cli_probe_resp (req, -1, GF_PROBE_QUORUM_NOT_MET,
-                                              NULL,
-                                              cli_req.hostname, cli_req.port);
+                                              NULL, hostname, port, dict);
                 gf_log (this->name, GF_LOG_ERROR, "Quorum does not meet, "
                         "rejecting operation");
                 ret = 0;
                 goto out;
         }
 
-        gf_cmd_log ("peer probe", " on host %s:%d", cli_req.hostname,
-                    cli_req.port);
         gf_log ("glusterd", GF_LOG_INFO, "Received CLI probe req %s %d",
-                cli_req.hostname, cli_req.port);
+                hostname, port);
 
         if (dict_get_str(this->options,"transport.socket.bind-address",
                          &bind_name) == 0) {
                 gf_log ("glusterd", GF_LOG_DEBUG,
                         "only checking probe address vs. bind address");
-                ret = glusterd_is_same_address(bind_name,cli_req.hostname);
+                ret = gf_is_same_address (bind_name, hostname);
         }
         else {
-                ret = glusterd_is_local_addr(cli_req.hostname);
+                ret = gf_is_local_addr (hostname);
         }
         if (ret) {
-                glusterd_xfer_cli_probe_resp (req, 0, GF_PROBE_LOCALHOST, NULL,
-                                              cli_req.hostname, cli_req.port);
+                glusterd_xfer_cli_probe_resp (req, 0, GF_PROBE_LOCALHOST,
+                                              NULL, hostname, port, dict);
                 ret = 0;
                 goto out;
         }
 
-        if (!(ret = glusterd_friend_find_by_hostname(cli_req.hostname,
-                                         &peerinfo))) {
-                if (strcmp (peerinfo->hostname, cli_req.hostname) == 0) {
+        if (!(ret = glusterd_friend_find_by_hostname (hostname, &peerinfo))) {
+                if (strcmp (peerinfo->hostname, hostname) == 0) {
 
                         gf_log ("glusterd", GF_LOG_DEBUG, "Probe host %s port "
-                                "%d already a peer", cli_req.hostname,
-                                cli_req.port);
+                                "%d already a peer", hostname, port);
                         glusterd_xfer_cli_probe_resp (req, 0, GF_PROBE_FRIEND,
-                                                      NULL, cli_req.hostname,
-                                                      cli_req.port);
+                                                      NULL, hostname, port,
+                                                      dict);
                         goto out;
                 }
         }
-        ret = glusterd_probe_begin (req, cli_req.hostname, cli_req.port);
-
-        gf_cmd_log ("peer probe","on host %s:%d %s",cli_req.hostname,
-                    cli_req.port, (ret) ? "FAILED" : "SUCCESS");
+        ret = glusterd_probe_begin (req, hostname, port, dict);
 
         if (ret == GLUSTERD_CONNECTION_AWAITED) {
                 //fsm should be run after connection establishes
                 run_fsm = _gf_false;
                 ret = 0;
         }
+
 out:
-        free (cli_req.hostname);//its malloced by xdr
+        free (cli_req.dict.dict_val);
 
         if (run_fsm) {
                 glusterd_friend_sm ();
@@ -788,14 +1126,24 @@ out:
 }
 
 int
-glusterd_handle_cli_deprobe (rpcsvc_request_t *req)
+glusterd_handle_cli_probe (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req, __glusterd_handle_cli_probe);
+}
+
+int
+__glusterd_handle_cli_deprobe (rpcsvc_request_t *req)
 {
         int32_t                         ret = -1;
-        gf1_cli_deprobe_req             cli_req = {0,};
-        uuid_t                          uuid = {0};
-        int                             op_errno = 0;
-        xlator_t                        *this = NULL;
-        glusterd_conf_t                 *priv = NULL;
+        gf_cli_req                  cli_req = {{0,},};
+        uuid_t                         uuid = {0};
+        int                        op_errno = 0;
+        xlator_t                      *this = NULL;
+        glusterd_conf_t               *priv = NULL;
+        dict_t                        *dict = NULL;
+        char                      *hostname = NULL;
+        int                            port = 0;
+        int                           flags = 0;
 
         this = THIS;
         GF_ASSERT (this);
@@ -804,16 +1152,46 @@ glusterd_handle_cli_deprobe (rpcsvc_request_t *req)
         GF_ASSERT (req);
 
         ret = xdr_to_generic (req->msg[0], &cli_req,
-                              (xdrproc_t)xdr_gf1_cli_deprobe_req);
+                              (xdrproc_t)xdr_gf_cli_req);
         if (ret < 0) {
                 //failed to decode msg;
                 req->rpc_err = GARBAGE_ARGS;
                 goto out;
         }
 
+        if (cli_req.dict.dict_len) {
+                dict = dict_new ();
+
+                ret = dict_unserialize (cli_req.dict.dict_val,
+                                        cli_req.dict.dict_len, &dict);
+                if (ret < 0) {
+                        gf_log (this->name, GF_LOG_ERROR, "Failed to "
+                                "unserialize req-buffer to dictionary");
+                        goto out;
+                }
+        }
+
         gf_log ("glusterd", GF_LOG_INFO, "Received CLI deprobe req");
 
-        ret = glusterd_hostname_to_uuid (cli_req.hostname, uuid);
+        ret = dict_get_str (dict, "hostname", &hostname);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to get hostname");
+                goto out;
+        }
+
+        ret = dict_get_int32 (dict, "port", &port);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to get port");
+                goto out;
+        }
+
+        ret = dict_get_int32 (dict, "flags", &flags);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to get flags");
+                goto out;
+        }
+
+        ret = glusterd_hostname_to_uuid (hostname, uuid);
         if (ret) {
                 op_errno = GF_DEPROBE_NOT_FRIEND;
                 goto out;
@@ -825,7 +1203,7 @@ glusterd_handle_cli_deprobe (rpcsvc_request_t *req)
                 goto out;
         }
 
-        if (!(cli_req.flags & GF_CLI_FLAG_OP_FORCE)) {
+        if (!(flags & GF_CLI_FLAG_OP_FORCE)) {
                 if (!uuid_is_null (uuid)) {
                         /* Check if peers are connected, except peer being detached*/
                         if (!glusterd_chk_peers_connected_befriended (uuid)) {
@@ -853,23 +1231,19 @@ glusterd_handle_cli_deprobe (rpcsvc_request_t *req)
         }
 
         if (!uuid_is_null (uuid)) {
-                ret = glusterd_deprobe_begin (req, cli_req.hostname,
-                                              cli_req.port, uuid);
+                ret = glusterd_deprobe_begin (req, hostname, port, uuid, dict);
         } else {
-                ret = glusterd_deprobe_begin (req, cli_req.hostname,
-                                              cli_req.port, NULL);
+                ret = glusterd_deprobe_begin (req, hostname, port, NULL, dict);
         }
 
-        gf_cmd_log ("peer deprobe", "on host %s:%d %s", cli_req.hostname,
-                    cli_req.port, (ret) ? "FAILED" : "SUCCESS");
 out:
+        free (cli_req.dict.dict_val);
+
         if (ret) {
                 ret = glusterd_xfer_cli_deprobe_resp (req, ret, op_errno, NULL,
-                                                      cli_req.hostname);
+                                                      hostname, dict);
         }
 
-        free (cli_req.hostname);//malloced by xdr
-
         glusterd_friend_sm ();
         glusterd_op_sm ();
 
@@ -877,7 +1251,13 @@ out:
 }
 
 int
-glusterd_handle_cli_list_friends (rpcsvc_request_t *req)
+glusterd_handle_cli_deprobe (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req, __glusterd_handle_cli_deprobe);
+}
+
+int
+__glusterd_handle_cli_list_friends (rpcsvc_request_t *req)
 {
         int32_t                         ret = -1;
         gf1_cli_peer_list_req           cli_req = {0,};
@@ -925,7 +1305,14 @@ out:
 }
 
 int
-glusterd_handle_cli_get_volume (rpcsvc_request_t *req)
+glusterd_handle_cli_list_friends (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req,
+                                            __glusterd_handle_cli_list_friends);
+}
+
+int
+__glusterd_handle_cli_get_volume (rpcsvc_request_t *req)
 {
         int32_t                         ret = -1;
         gf_cli_req                      cli_req = {{0,}};
@@ -978,76 +1365,15 @@ out:
         return ret;
 }
 
-#ifdef HAVE_BD_XLATOR
 int
-glusterd_handle_cli_bd_op (rpcsvc_request_t *req)
+glusterd_handle_cli_get_volume (rpcsvc_request_t *req)
 {
-        int32_t          ret        = -1;
-        gf_cli_req       cli_req    = { {0,} };
-        dict_t           *dict      = NULL;
-        char             *volname   = NULL;
-        char             op_errstr[2048] = {0,};
-        glusterd_op_t    cli_op     = GD_OP_BD_OP;
-
-        GF_ASSERT (req);
-
-        ret = xdr_to_generic (req->msg[0], &cli_req, (xdrproc_t)xdr_gf_cli_req);
-        if (ret < 0) {
-                /* failed to decode msg */
-                req->rpc_err = GARBAGE_ARGS;
-                goto out;
-        }
-
-        gf_log ("glusterd", GF_LOG_DEBUG, "Received bd op req");
-
-        if (cli_req.dict.dict_len) {
-                /* Unserialize the dictionary */
-                dict  = dict_new ();
-
-                ret = dict_unserialize (cli_req.dict.dict_val,
-                                        cli_req.dict.dict_len,
-                                        &dict);
-                if (ret < 0) {
-                        gf_log ("glusterd", GF_LOG_ERROR,
-                                "failed to "
-                                "unserialize req-buffer to dictionary");
-                        goto out;
-                } else {
-                        dict->extra_stdfree = cli_req.dict.dict_val;
-                }
-        }
-
-        ret = dict_get_str (dict, "volname", &volname);
-        if (ret) {
-                gf_log (THIS->name, GF_LOG_ERROR,
-                                "failed to get volname");
-                goto out;
-        }
-
-        ret = glusterd_op_begin (req, GD_OP_BD_OP, dict, op_errstr,
-                                 sizeof (op_errstr));
-        gf_cmd_log ("bd op: %s", ((ret == 0) ? "SUCCESS": "FAILED"));
-out:
-        if (ret && dict)
-                dict_unref (dict);
-
-        glusterd_friend_sm ();
-        glusterd_op_sm ();
-
-        if (ret) {
-                if (op_errstr[0] == '\0')
-                        snprintf (op_errstr, sizeof (op_errstr),
-                                  "Operation failed");
-                ret = glusterd_op_send_cli_response (cli_op, ret, 0,
-                                req, NULL, op_errstr);
-        }
-
-        return ret;
+        return glusterd_big_locked_handler (req,
+                                            __glusterd_handle_cli_get_volume);
 }
-#endif
 
 int
-glusterd_handle_cli_uuid_reset (rpcsvc_request_t *req)
+__glusterd_handle_cli_uuid_reset (rpcsvc_request_t *req)
 {
         int                     ret     = -1;
         dict_t                  *dict   = NULL;
@@ -1144,7 +1470,112 @@ out:
 }
 
 int
-glusterd_handle_cli_list_volume (rpcsvc_request_t *req)
+glusterd_handle_cli_uuid_reset (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req,
+                                            __glusterd_handle_cli_uuid_reset);
+}
+
+int
+__glusterd_handle_cli_uuid_get (rpcsvc_request_t *req)
+{
+        int                     ret         = -1;
+        dict_t                  *dict       = NULL;
+        dict_t                  *rsp_dict   = NULL;
+        xlator_t                *this       = NULL;
+        glusterd_conf_t         *priv       = NULL;
+        gf_cli_rsp              rsp         = {0,};
+        gf_cli_req              cli_req     = {{0,}};
+        char                    msg_str[2048] = {0,};
+        char                    uuid_str[64] = {0,};
+
+        GF_ASSERT (req);
+
+        this = THIS;
+        priv = this->private;
+        GF_ASSERT (priv);
+
+        ret = xdr_to_generic (req->msg[0], &cli_req, (xdrproc_t)xdr_gf_cli_req);
+        if (ret < 0) {
+                req->rpc_err = GARBAGE_ARGS;
+                goto out;
+        }
+
+        gf_log ("glusterd", GF_LOG_DEBUG, "Received uuid get req");
+
+        if (cli_req.dict.dict_len) {
+                dict  = dict_new ();
+                if (!dict) {
+                        ret = -1;
+                        goto out;
+                }
+
+                ret = dict_unserialize (cli_req.dict.dict_val,
+                                        cli_req.dict.dict_len,
+                                        &dict);
+                if (ret < 0) {
+                        gf_log ("glusterd", GF_LOG_ERROR,
+                                "failed to "
+                                "unserialize req-buffer to dictionary");
+                        snprintf (msg_str, sizeof (msg_str), "Unable to decode "
+                                  "the buffer");
+                        goto out;
+
+                } else {
+                        dict->extra_stdfree = cli_req.dict.dict_val;
+
+                }
+        }
+
+        rsp_dict = dict_new ();
+        if (!rsp_dict) {
+                ret = -1;
+                goto out;
+        }
+
+        uuid_utoa_r (MY_UUID, uuid_str);
+        ret = dict_set_str (rsp_dict, "uuid", uuid_str);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to set uuid in "
+                        "dictionary.");
+                goto out;
+        }
+
+        ret = dict_allocate_and_serialize (rsp_dict, &rsp.dict.dict_val,
+                                           &rsp.dict.dict_len);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to serialize "
+                        "dictionary.");
+                goto out;
+        }
+        ret = 0;
+out:
+        if (ret) {
+                rsp.op_ret = -1;
+                if (msg_str[0] == '\0')
+                        snprintf (msg_str, sizeof (msg_str), "Operation "
+                                  "failed");
+                rsp.op_errstr = msg_str;
+
+        } else {
+                rsp.op_errstr = "";
+
+        }
+
+        glusterd_to_cli (req, &rsp, NULL, 0, NULL,
+                         (xdrproc_t)xdr_gf_cli_rsp, dict);
+
+        return 0;
+}
+int
+glusterd_handle_cli_uuid_get (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req,
+                                            __glusterd_handle_cli_uuid_get);
+}
+
+int
+__glusterd_handle_cli_list_volume (rpcsvc_request_t *req)
 {
         int                     ret = -1;
         dict_t                  *dict = NULL;
@@ -1203,6 +1634,13 @@ out:
         return ret;
 }
 
+int
+glusterd_handle_cli_list_volume (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req,
+                                            __glusterd_handle_cli_list_volume);
+}
+
 int32_t
 glusterd_op_begin (rpcsvc_request_t *req, glusterd_op_t op, void *ctx,
                    char *err_str, size_t err_len)
@@ -1215,7 +1653,7 @@ glusterd_op_begin (rpcsvc_request_t *req, glusterd_op_t op, void *ctx,
 }
 
 int
-glusterd_handle_reset_volume (rpcsvc_request_t *req)
+__glusterd_handle_reset_volume (rpcsvc_request_t *req)
 {
         int32_t                         ret = -1;
         gf_cli_req                      cli_req = {{0,}};
@@ -1280,9 +1718,15 @@ out:
         return ret;
 }
 
+int
+glusterd_handle_reset_volume (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req,
+                                            __glusterd_handle_reset_volume);
+}
 
 int
-glusterd_handle_set_volume (rpcsvc_request_t *req)
+__glusterd_handle_set_volume (rpcsvc_request_t *req)
 {
         int32_t                         ret = -1;
         gf_cli_req                      cli_req = {{0,}};
@@ -1382,7 +1826,13 @@ out:
 }
 
 int
-glusterd_handle_sync_volume (rpcsvc_request_t *req)
+glusterd_handle_set_volume (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req, __glusterd_handle_set_volume);
+}
+
+int
+__glusterd_handle_sync_volume (rpcsvc_request_t *req)
 {
         int32_t                          ret     = -1;
         gf_cli_req                       cli_req = {{0,}};
@@ -1445,7 +1895,7 @@ glusterd_handle_sync_volume (rpcsvc_request_t *req)
         gf_log (this->name, GF_LOG_INFO, "Received volume sync req "
                 "for volume %s", (flags & GF_CLI_SYNC_ALL) ? "all" : volname);
 
-        if (glusterd_is_local_addr (hostname)) {
+        if (gf_is_local_addr (hostname)) {
                 ret = -1;
                 snprintf (msg, sizeof (msg), "sync from localhost"
                           " not allowed");
@@ -1471,6 +1921,12 @@ out:
 }
 
 int
+glusterd_handle_sync_volume (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req, __glusterd_handle_sync_volume);
+}
+
+int
 glusterd_fsm_log_send_resp (rpcsvc_request_t *req, int op_ret,
                             char *op_errstr, dict_t *dict)
 {
@@ -1497,7 +1953,7 @@ glusterd_fsm_log_send_resp (rpcsvc_request_t *req, int op_ret,
 }
 
 int
-glusterd_handle_fsm_log (rpcsvc_request_t *req)
+__glusterd_handle_fsm_log (rpcsvc_request_t *req)
 {
         int32_t                         ret = -1;
         gf1_cli_fsm_log_req             cli_req = {0,};
@@ -1554,6 +2010,12 @@ out:
 }
 
 int
+glusterd_handle_fsm_log (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req, __glusterd_handle_fsm_log);
+}
+
+int
 glusterd_op_lock_send_resp (rpcsvc_request_t *req, int32_t status)
 {
 
@@ -1592,13 +2054,65 @@ glusterd_op_unlock_send_resp (rpcsvc_request_t *req, int32_t status)
 }
 
 int
-glusterd_handle_cluster_unlock (rpcsvc_request_t *req)
+glusterd_op_mgmt_v3_lock_send_resp (rpcsvc_request_t *req, uuid_t *txn_id,
+                                    int32_t status)
+{
+
+        gd1_mgmt_v3_lock_rsp           rsp = {{0},};
+        int                            ret = -1;
+
+        GF_ASSERT (req);
+        GF_ASSERT (txn_id);
+        glusterd_get_uuid (&rsp.uuid);
+        rsp.op_ret = status;
+        if (rsp.op_ret)
+               rsp.op_errno = errno;
+        uuid_copy (rsp.txn_id, *txn_id);
+
+        ret = glusterd_submit_reply (req, &rsp, NULL, 0, NULL,
+                                     (xdrproc_t)xdr_gd1_mgmt_v3_lock_rsp);
+
+        gf_log (THIS->name, GF_LOG_DEBUG, "Responded to mgmt_v3 lock, ret: %d",
+                ret);
+
+        return ret;
+}
+
+int
+glusterd_op_mgmt_v3_unlock_send_resp (rpcsvc_request_t *req, uuid_t *txn_id,
+                                      int32_t status)
+{
+
+        gd1_mgmt_v3_unlock_rsp          rsp = {{0},};
+        int                             ret = -1;
+
+        GF_ASSERT (req);
+        GF_ASSERT (txn_id);
+        rsp.op_ret = status;
+        if (rsp.op_ret)
+               rsp.op_errno = errno;
+        glusterd_get_uuid (&rsp.uuid);
+        uuid_copy (rsp.txn_id, *txn_id);
+
+        ret = glusterd_submit_reply (req, &rsp, NULL, 0, NULL,
+                                     (xdrproc_t)xdr_gd1_mgmt_v3_unlock_rsp);
+
+        gf_log (THIS->name, GF_LOG_DEBUG,
+                "Responded to mgmt_v3 unlock, ret: %d",
+                ret);
+
+        return ret;
+}
+
+int
+__glusterd_handle_cluster_unlock (rpcsvc_request_t *req)
 {
         gd1_mgmt_cluster_unlock_req     unlock_req = {{0}, };
         int32_t                         ret = -1;
         glusterd_op_lock_ctx_t          *ctx = NULL;
         glusterd_peerinfo_t             *peerinfo = NULL;
         xlator_t                        *this = NULL;
+        uuid_t                          *txn_id = &global_txn_id;
 
         this = THIS;
         GF_ASSERT (this);
@@ -1633,8 +2147,9 @@ glusterd_handle_cluster_unlock (rpcsvc_request_t *req)
         }
         uuid_copy (ctx->uuid, unlock_req.uuid);
         ctx->req = req;
+        ctx->dict = NULL;
 
-        ret = glusterd_op_sm_inject_event (GD_OP_EVENT_UNLOCK, ctx);
+        ret = glusterd_op_sm_inject_event (GD_OP_EVENT_UNLOCK, txn_id, ctx);
 
 out:
         glusterd_friend_sm ();
@@ -1644,6 +2159,13 @@ out:
 }
 
 int
+glusterd_handle_cluster_unlock (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req,
+                                            __glusterd_handle_cluster_unlock);
+}
+
+int
 glusterd_op_stage_send_resp (rpcsvc_request_t   *req,
                              int32_t op, int32_t status,
                              char *op_errstr, dict_t *rsp_dict)
@@ -1724,7 +2246,7 @@ out:
 }
 
 int
-glusterd_handle_incoming_friend_req (rpcsvc_request_t *req)
+__glusterd_handle_incoming_friend_req (rpcsvc_request_t *req)
 {
         int32_t                 ret = -1;
         gd1_mgmt_friend_req     friend_req = {{0},};
@@ -1763,7 +2285,14 @@ out:
 }
 
 int
-glusterd_handle_incoming_unfriend_req (rpcsvc_request_t *req)
+glusterd_handle_incoming_friend_req (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req,
+                                            __glusterd_handle_incoming_friend_req);
+}
+
+int
+__glusterd_handle_incoming_unfriend_req (rpcsvc_request_t *req)
 {
         int32_t                 ret = -1;
         gd1_mgmt_friend_req     friend_req = {{0},};
@@ -1801,6 +2330,14 @@ out:
 }
 
 int
+glusterd_handle_incoming_unfriend_req (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req,
+                                            __glusterd_handle_incoming_unfriend_req);
+
+}
+
+int
 glusterd_handle_friend_update_delete (dict_t *dict)
 {
         char                    *hostname = NULL;
@@ -1846,7 +2383,7 @@ out:
 }
 
 int
-glusterd_handle_friend_update (rpcsvc_request_t *req)
+__glusterd_handle_friend_update (rpcsvc_request_t *req)
 {
         int32_t                 ret = -1;
         gd1_mgmt_friend_update     friend_req = {{0},};
@@ -1983,7 +2520,14 @@ out:
 }
 
 int
-glusterd_handle_probe_query (rpcsvc_request_t *req)
+glusterd_handle_friend_update (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req,
+                                            __glusterd_handle_friend_update);
+}
+
+int
+__glusterd_handle_probe_query (rpcsvc_request_t *req)
 {
         int32_t                         ret = -1;
         xlator_t                        *this = NULL;
@@ -2077,8 +2621,13 @@ out:
         return ret;
 }
 
+int glusterd_handle_probe_query (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req, __glusterd_handle_probe_query);
+}
+
 int
-glusterd_handle_cli_profile_volume (rpcsvc_request_t *req)
+__glusterd_handle_cli_profile_volume (rpcsvc_request_t *req)
 {
         int32_t                         ret     = -1;
         gf_cli_req                      cli_req = {{0,}};
@@ -2146,7 +2695,14 @@ out:
 }
 
 int
-glusterd_handle_getwd (rpcsvc_request_t *req)
+glusterd_handle_cli_profile_volume (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req,
+                                            __glusterd_handle_cli_profile_volume);
+}
+
+int
+__glusterd_handle_getwd (rpcsvc_request_t *req)
 {
         int32_t                 ret = -1;
         gf1_cli_getwd_rsp     rsp = {0,};
@@ -2171,16 +2727,23 @@ glusterd_handle_getwd (rpcsvc_request_t *req)
         return ret;
 }
 
+int
+glusterd_handle_getwd (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req, __glusterd_handle_getwd);
+}
 
 int
-glusterd_handle_mount (rpcsvc_request_t *req)
+__glusterd_handle_mount (rpcsvc_request_t *req)
 {
         gf1_cli_mount_req mnt_req = {0,};
         gf1_cli_mount_rsp rsp     = {0,};
         dict_t *dict              = NULL;
         int ret                   = 0;
+        glusterd_conf_t     *priv   = NULL;
 
         GF_ASSERT (req);
+	priv = THIS->private;
 
         ret = xdr_to_generic (req->msg[0], &mnt_req,
                               (xdrproc_t)xdr_gf1_cli_mount_req);
@@ -2213,8 +2776,10 @@ glusterd_handle_mount (rpcsvc_request_t *req)
                 }
         }
 
+	synclock_unlock (&priv->big_lock);
         rsp.op_ret = glusterd_do_mount (mnt_req.label, dict,
                                         &rsp.path, &rsp.op_errno);
+	synclock_lock (&priv->big_lock);
 
  out:
         if (!rsp.path)
@@ -2236,7 +2801,13 @@ glusterd_handle_mount (rpcsvc_request_t *req)
 }
 
 int
-glusterd_handle_umount (rpcsvc_request_t *req)
+glusterd_handle_mount (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req, __glusterd_handle_mount);
+}
+
+int
+__glusterd_handle_umount (rpcsvc_request_t *req)
 {
         gf1_cli_umount_req umnt_req = {0,};
         gf1_cli_umount_rsp rsp      = {0,};
@@ -2249,9 +2820,11 @@ glusterd_handle_umount (rpcsvc_request_t *req)
         gf_boolean_t dir_ok         = _gf_false;
         char *pdir                  = NULL;
         char *t                     = NULL;
+        glusterd_conf_t     *priv   = NULL;
 
         GF_ASSERT (req);
         GF_ASSERT (this);
+        priv = this->private;
 
         ret = xdr_to_generic (req->msg[0], &umnt_req,
                               (xdrproc_t)xdr_gf1_cli_umount_req);
@@ -2294,7 +2867,9 @@ glusterd_handle_umount (rpcsvc_request_t *req)
         runner_add_args (&runner, "umount", umnt_req.path, NULL);
         if (umnt_req.lazy)
                 runner_add_arg (&runner, "-l");
+        synclock_unlock (&priv->big_lock);
         rsp.op_ret = runner_run (&runner);
+        synclock_lock (&priv->big_lock);
         if (rsp.op_ret == 0) {
                 if (realpath (umnt_req.path, mntp))
                         rmdir (mntp);
@@ -2323,6 +2898,12 @@ glusterd_handle_umount (rpcsvc_request_t *req)
 }
 
 int
+glusterd_handle_umount (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req, __glusterd_handle_umount);
+}
+
+int
 glusterd_friend_remove (uuid_t uuid, char *hostname)
 {
         int                           ret = 0;
@@ -2527,7 +3108,9 @@ glusterd_friend_add (const char *hoststr, int port,
         if (!restore) {
                 ret = glusterd_store_peerinfo (*friend);
                 if (ret == 0) {
+                        synclock_unlock (&conf->big_lock);
                         ret = glusterd_friend_rpc_create (this, *friend, args);
+                        synclock_lock (&conf->big_lock);
                 }
                 else {
                         gf_log (this->name, GF_LOG_ERROR,
@@ -2546,7 +3129,8 @@ out:
 }
 
 int
-glusterd_probe_begin (rpcsvc_request_t *req, const char *hoststr, int port)
+glusterd_probe_begin (rpcsvc_request_t *req, const char *hoststr, int port,
+                      dict_t *dict)
 {
         int                             ret = -1;
         glusterd_peerinfo_t             *peerinfo = NULL;
@@ -2562,6 +3146,7 @@ glusterd_probe_begin (rpcsvc_request_t *req, const char *hoststr, int port)
                         " for host: %s (%d)", hoststr, port);
                 args.mode = GD_MODE_ON;
                 args.req  = req;
+                args.dict = dict;
                 ret = glusterd_friend_add ((char *)hoststr, port,
                                            GD_FRIEND_STATE_DEFAULT,
                                            NULL, &peerinfo, 0, &args);
@@ -2583,11 +3168,11 @@ glusterd_probe_begin (rpcsvc_request_t *req, const char *hoststr, int port)
                         ret = glusterd_friend_sm_inject_event (event);
                         glusterd_xfer_cli_probe_resp (req, 0, GF_PROBE_SUCCESS,
                                                       NULL, (char*)hoststr,
-                                                      port);
+                                                      port, dict);
                 }
         } else {
                 glusterd_xfer_cli_probe_resp (req, 0, GF_PROBE_FRIEND, NULL,
-                                              (char*)hoststr, port);
+                                              (char*)hoststr, port, dict);
         }
 
 out:
@@ -2597,7 +3182,7 @@ out:
 
 int
 glusterd_deprobe_begin (rpcsvc_request_t *req, const char *hoststr, int port,
-                        uuid_t uuid)
+                        uuid_t uuid, dict_t *dict)
 {
         int                             ret = -1;
         glusterd_peerinfo_t             *peerinfo = NULL;
@@ -2638,6 +3223,7 @@ glusterd_deprobe_begin (rpcsvc_request_t *req, const char *hoststr, int port,
         ctx->hostname = gf_strdup (hoststr);
         ctx->port = port;
         ctx->req = req;
+        ctx->dict = dict;
 
         event->ctx = ctx;
 
@@ -2685,15 +3271,16 @@ glusterd_xfer_friend_remove_resp (rpcsvc_request_t *req, char *hostname, int por
 
 
 int
-glusterd_xfer_friend_add_resp (rpcsvc_request_t *req, char *hostname, int port,
-                               int32_t op_ret, int32_t op_errno)
+glusterd_xfer_friend_add_resp (rpcsvc_request_t *req, char *myhostname,
+                               char *remote_hostname, int port, int32_t op_ret,
+                               int32_t op_errno)
 {
         gd1_mgmt_friend_rsp  rsp = {{0}, };
         int32_t              ret = -1;
         xlator_t             *this = NULL;
         glusterd_conf_t      *conf = NULL;
 
-        GF_ASSERT (hostname);
+        GF_ASSERT (myhostname);
 
         this = THIS;
         GF_ASSERT (this);
@@ -2703,61 +3290,217 @@ glusterd_xfer_friend_add_resp (rpcsvc_request_t *req, char *hostname, int port,
         uuid_copy (rsp.uuid, MY_UUID);
         rsp.op_ret = op_ret;
         rsp.op_errno = op_errno;
-        rsp.hostname = gf_strdup (hostname);
+        rsp.hostname = gf_strdup (myhostname);
         rsp.port = port;
 
         ret = glusterd_submit_reply (req, &rsp, NULL, 0, NULL,
                                      (xdrproc_t)xdr_gd1_mgmt_friend_rsp);
 
         gf_log ("glusterd", GF_LOG_INFO,
-                "Responded to %s (%d), ret: %d", hostname, port, ret);
+                "Responded to %s (%d), ret: %d", remote_hostname, port, ret);
         GF_FREE (rsp.hostname);
         return ret;
 }
 
+static void
+set_probe_error_str (int op_ret, int op_errno, char *op_errstr, char *errstr,
+                     size_t len, char *hostname, int port)
+{
+        if ((op_errstr) && (strcmp (op_errstr, ""))) {
+                snprintf (errstr, len, "%s", op_errstr);
+                return;
+        }
+
+        if (!op_ret) {
+                switch (op_errno) {
+                        case GF_PROBE_LOCALHOST:
+                                snprintf (errstr, len, "Probe on localhost not "
+                                          "needed");
+                                break;
+
+                        case GF_PROBE_FRIEND:
+                                snprintf (errstr, len, "Host %s port %d already"
+                                          " in peer list", hostname, port);
+                                break;
+
+                        default:
+                                if (op_errno != 0)
+                                        snprintf (errstr, len, "Probe returned "
+                                                  "with unknown errno %d",
+                                                  op_errno);
+                                break;
+                }
+        } else {
+                switch (op_errno) {
+                        case GF_PROBE_ANOTHER_CLUSTER:
+                                snprintf (errstr, len, "%s is already part of "
+                                          "another cluster", hostname);
+                                break;
+
+                        case GF_PROBE_VOLUME_CONFLICT:
+                                snprintf (errstr, len, "Atleast one volume on "
+                                          "%s conflicts with existing volumes "
+                                          "in the cluster", hostname);
+                                break;
+
+                        case GF_PROBE_UNKNOWN_PEER:
+                                snprintf (errstr, len, "%s responded with "
+                                          "'unknown peer' error, this could "
+                                          "happen if %s doesn't have localhost "
+                                          "in its peer database", hostname,
+                                          hostname);
+                                break;
+
+                        case GF_PROBE_ADD_FAILED:
+                                snprintf (errstr, len, "Failed to add peer "
+                                          "information on %s", hostname);
+                                break;
+
+                        case GF_PROBE_SAME_UUID:
+                                snprintf (errstr, len, "Peer uuid (host %s) is "
+                                          "same as local uuid", hostname);
+                                break;
+
+                        case GF_PROBE_QUORUM_NOT_MET:
+                                snprintf (errstr, len, "Cluster quorum is not "
+                                          "met. Changing peers is not allowed "
+                                          "in this state");
+                                break;
+
+                        default:
+                                snprintf (errstr, len, "Probe returned with "
+                                          "unknown errno %d", op_errno);
+                                break;
+                }
+        }
+}
+
 int
 glusterd_xfer_cli_probe_resp (rpcsvc_request_t *req, int32_t op_ret,
                               int32_t op_errno, char *op_errstr, char *hostname,
-                              int port)
+                              int port, dict_t *dict)
 {
-        gf1_cli_probe_rsp    rsp = {0, };
+        gf_cli_rsp           rsp = {0,};
         int32_t              ret = -1;
+        char        errstr[2048] = {0,};
+        char            *cmd_str = NULL;
+        xlator_t           *this = THIS;
 
         GF_ASSERT (req);
+        GF_ASSERT (this);
+
+        (void) set_probe_error_str (op_ret, op_errno, op_errstr, errstr,
+                                    sizeof (errstr), hostname, port);
+
+        if (dict) {
+                ret = dict_get_str (dict, "cmd-str", &cmd_str);
+                if (ret)
+                        gf_log (this->name, GF_LOG_ERROR, "Failed to get "
+                                "command string");
+        }
 
         rsp.op_ret = op_ret;
         rsp.op_errno = op_errno;
-        rsp.op_errstr = op_errstr ? op_errstr : "";
-        rsp.hostname = hostname;
-        rsp.port = port;
+        rsp.op_errstr = (errstr[0] != '\0') ? errstr : "";
+
+        gf_cmd_log ("", "%s : %s %s %s", cmd_str,
+                    (op_ret) ? "FAILED" : "SUCCESS",
+                    (errstr[0] != '\0') ? ":" : " ",
+                    (errstr[0] != '\0') ? errstr : " ");
 
         ret = glusterd_submit_reply (req, &rsp, NULL, 0, NULL,
-                                     (xdrproc_t)xdr_gf1_cli_probe_rsp);
+                                     (xdrproc_t)xdr_gf_cli_rsp);
 
-        gf_log ("glusterd", GF_LOG_INFO, "Responded to CLI, ret: %d",ret);
+        if (dict)
+                dict_unref (dict);
+        gf_log (this->name, GF_LOG_DEBUG, "Responded to CLI, ret: %d",ret);
 
         return ret;
 }
 
+static void
+set_deprobe_error_str (int op_ret, int op_errno, char *op_errstr, char *errstr,
+                       size_t len, char *hostname)
+{
+        if ((op_errstr) && (strcmp (op_errstr, ""))) {
+                snprintf (errstr, len, "%s", op_errstr);
+                return;
+        }
+
+        if (op_ret) {
+                switch (op_errno) {
+                        case GF_DEPROBE_LOCALHOST:
+                                snprintf (errstr, len, "%s is localhost",
+                                hostname);
+                                break;
+
+                        case GF_DEPROBE_NOT_FRIEND:
+                                snprintf (errstr, len, "%s is not part of "
+                                          "cluster", hostname);
+                                break;
+
+                        case GF_DEPROBE_BRICK_EXIST:
+                                snprintf (errstr, len, "Brick(s) with the peer "
+                                          "%s exist in cluster", hostname);
+                                break;
+
+                        case GF_DEPROBE_FRIEND_DOWN:
+                                snprintf (errstr, len, "One of the peers is "
+                                          "probably down. Check with "
+                                          "'peer status'");
+                                break;
+
+                        case GF_DEPROBE_QUORUM_NOT_MET:
+                                snprintf (errstr, len, "Cluster quorum is not "
+                                          "met. Changing peers is not allowed "
+                                          "in this state");
+                                break;
+
+                        default:
+                                snprintf (errstr, len, "Detach returned with "
+                                          "unknown errno %d", op_errno);
+                                break;
+
+                }
+        }
+}
+
+
 int
 glusterd_xfer_cli_deprobe_resp (rpcsvc_request_t *req, int32_t op_ret,
                                 int32_t op_errno, char *op_errstr,
-                                char *hostname)
+                                char *hostname, dict_t *dict)
 {
-        gf1_cli_deprobe_rsp    rsp = {0, };
+        gf_cli_rsp             rsp = {0,};
         int32_t                ret = -1;
+        char              *cmd_str = NULL;
+        char          errstr[2048] = {0,};
 
         GF_ASSERT (req);
 
+        (void) set_deprobe_error_str (op_ret, op_errno, op_errstr, errstr,
+                                      sizeof (errstr), hostname);
+
+        if (dict) {
+                ret = dict_get_str (dict, "cmd-str", &cmd_str);
+                if (ret)
+                        gf_log (THIS->name, GF_LOG_ERROR, "Failed to get "
+                                "command string");
+        }
+
         rsp.op_ret = op_ret;
         rsp.op_errno = op_errno;
-        rsp.op_errstr = op_errstr ? op_errstr : "";
-        rsp.hostname = hostname;
+        rsp.op_errstr = (errstr[0] != '\0') ? errstr : "";
+
+        gf_cmd_log ("", "%s : %s %s %s", cmd_str,
+                    (op_ret) ? "FAILED" : "SUCCESS",
+                    (errstr[0] != '\0') ? ":" : " ",
+                    (errstr[0] != '\0') ? errstr : " ");
 
         ret = glusterd_submit_reply (req, &rsp, NULL, 0, NULL,
-                                     (xdrproc_t)xdr_gf1_cli_deprobe_rsp);
+                                     (xdrproc_t)xdr_gf_cli_rsp);
 
-        gf_log ("glusterd", GF_LOG_INFO, "Responded to CLI, ret: %d",ret);
+        gf_log (THIS->name, GF_LOG_DEBUG, "Responded to CLI, ret: %d",ret);
 
         return ret;
 }
@@ -2771,37 +3514,50 @@ glusterd_list_friends (rpcsvc_request_t *req, dict_t *dict, int32_t flags)
         int32_t                 count = 0;
         dict_t                  *friends = NULL;
         gf1_cli_peer_list_rsp   rsp = {0,};
+        char                    my_uuid_str[64] = {0,};
+        char                    key[256] = {0,};
 
         priv = THIS->private;
         GF_ASSERT (priv);
 
-        if (!list_empty (&priv->peers)) {
-                friends = dict_new ();
-                if (!friends) {
-                        gf_log ("", GF_LOG_WARNING, "Out of Memory");
-                        goto out;
-                }
-        } else {
-                ret = 0;
+        friends = dict_new ();
+        if (!friends) {
+                gf_log ("", GF_LOG_WARNING, "Out of Memory");
                 goto out;
         }
-
-        if (flags == GF_CLI_LIST_ALL) {
-                        list_for_each_entry (entry, &priv->peers, uuid_list) {
-                                count++;
-                                ret = glusterd_add_peer_detail_to_dict (entry,
+        if (!list_empty (&priv->peers)) {
+                list_for_each_entry (entry, &priv->peers, uuid_list) {
+                        count++;
+                        ret = glusterd_add_peer_detail_to_dict (entry,
                                                                 friends, count);
-                                if (ret)
-                                        goto out;
+                        if (ret)
+                                goto out;
+                }
+        }
 
-                        }
+        if (flags == GF_CLI_LIST_POOL_NODES) {
+                count++;
+                snprintf (key, 256, "friend%d.uuid", count);
+                uuid_utoa_r (MY_UUID, my_uuid_str);
+                ret = dict_set_str (friends, key, my_uuid_str);
+                if (ret)
+                        goto out;
 
-                        ret = dict_set_int32 (friends, "count", count);
+                snprintf (key, 256, "friend%d.hostname", count);
+                ret = dict_set_str (friends, key, "localhost");
+                if (ret)
+                        goto out;
 
-                        if (ret)
-                                goto out;
+                snprintf (key, 256, "friend%d.connected", count);
+                ret = dict_set_int32 (friends, key, 1);
+                if (ret)
+                        goto out;
         }
 
+        ret = dict_set_int32 (friends, "count", count);
+        if (ret)
+                goto out;
+
         ret = dict_allocate_and_serialize (friends, &rsp.friends.friends_val,
                                            &rsp.friends.friends_len);
 
@@ -2932,7 +3688,7 @@ out:
 }
 
 int
-glusterd_handle_status_volume (rpcsvc_request_t *req)
+__glusterd_handle_status_volume (rpcsvc_request_t *req)
 {
         int32_t                         ret     = -1;
         uint32_t                        cmd     = 0;
@@ -3004,7 +3760,14 @@ out:
 }
 
 int
-glusterd_handle_cli_clearlocks_volume (rpcsvc_request_t *req)
+glusterd_handle_status_volume (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req,
+                                            __glusterd_handle_status_volume);
+}
+
+int
+__glusterd_handle_cli_clearlocks_volume (rpcsvc_request_t *req)
 {
         int32_t                         ret = -1;
         gf_cli_req                      cli_req = {{0,}};
@@ -3073,17 +3836,69 @@ out:
 }
 
 int
-glusterd_brick_rpc_notify (struct rpc_clnt *rpc, void *mydata,
-                          rpc_clnt_event_t event,
-                          void *data)
+glusterd_handle_cli_clearlocks_volume (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req,
+                                            __glusterd_handle_cli_clearlocks_volume);
+}
+
+static int
+get_brickinfo_from_brickid (char *brickid, glusterd_brickinfo_t **brickinfo)
+{
+        glusterd_volinfo_t      *volinfo    = NULL;
+        char                    *volid_str  = NULL;
+        char                    *brick      = NULL;
+        char                    *brickid_dup = NULL;
+        uuid_t                  volid       = {0};
+        int                     ret         = -1;
+
+        brickid_dup = gf_strdup (brickid);
+        if (!brickid_dup)
+                goto out;
+
+        volid_str = brickid_dup;
+        brick = strchr (brickid_dup, ':');
+        *brick = '\0';
+        brick++;
+        if (!volid_str || !brick)
+                goto out;
+
+        uuid_parse (volid_str, volid);
+        ret = glusterd_volinfo_find_by_volume_id (volid, &volinfo);
+        if (ret) {
+                /* Check if it a snapshot volume */
+                ret = glusterd_snap_volinfo_find_by_volume_id (volid, &volinfo);
+                if (ret)
+                        goto out;
+        }
+
+        ret = glusterd_volume_brickinfo_get_by_brick (brick, volinfo,
+                                                      brickinfo);
+        if (ret)
+                goto out;
+
+        ret = 0;
+out:
+        GF_FREE (brickid_dup);
+        return ret;
+}
+
+int
+__glusterd_brick_rpc_notify (struct rpc_clnt *rpc, void *mydata,
+                          rpc_clnt_event_t event, void *data)
 {
         xlator_t                *this = NULL;
         glusterd_conf_t         *conf = NULL;
         int                     ret = 0;
+        char                    *brickid = NULL;
         glusterd_brickinfo_t    *brickinfo = NULL;
 
-        brickinfo = mydata;
-        if (!brickinfo)
+        brickid = mydata;
+        if (!brickid)
+                return 0;
+
+        ret = get_brickinfo_from_brickid (brickid, &brickinfo);
+        if (ret)
                 return 0;
 
         this = THIS;
@@ -3093,15 +3908,21 @@ glusterd_brick_rpc_notify (struct rpc_clnt *rpc, void *mydata,
 
         switch (event) {
         case RPC_CLNT_CONNECT:
-                gf_log (this->name, GF_LOG_DEBUG, "got RPC_CLNT_CONNECT");
+                gf_log (this->name, GF_LOG_DEBUG, "Connected to %s:%s",
+                        brickinfo->hostname, brickinfo->path);
                 glusterd_set_brick_status (brickinfo, GF_BRICK_STARTED);
                 ret = default_notify (this, GF_EVENT_CHILD_UP, NULL);
 
                 break;
 
         case RPC_CLNT_DISCONNECT:
-                gf_log (this->name, GF_LOG_DEBUG, "got RPC_CLNT_DISCONNECT");
+                if (GF_BRICK_STARTED == brickinfo->status)
+                        gf_log (this->name, GF_LOG_INFO, "Disconnected from "
+                                "%s:%s", brickinfo->hostname, brickinfo->path);
+
                 glusterd_set_brick_status (brickinfo, GF_BRICK_STOPPED);
+                if (rpc_clnt_is_disabled (rpc))
+                        GF_FREE (brickid);
                 break;
 
         default:
@@ -3114,9 +3935,16 @@ glusterd_brick_rpc_notify (struct rpc_clnt *rpc, void *mydata,
 }
 
 int
-glusterd_nodesvc_rpc_notify (struct rpc_clnt *rpc, void *mydata,
-                             rpc_clnt_event_t event,
-                             void *data)
+glusterd_brick_rpc_notify (struct rpc_clnt *rpc, void *mydata,
+                           rpc_clnt_event_t event, void *data)
+{
+        return glusterd_big_locked_notify (rpc, mydata, event, data,
+                                           __glusterd_brick_rpc_notify);
+}
+
+int
+__glusterd_nodesvc_rpc_notify (struct rpc_clnt *rpc, void *mydata,
+                               rpc_clnt_event_t event, void *data)
 {
         xlator_t                *this = NULL;
         glusterd_conf_t         *conf = NULL;
@@ -3155,6 +3983,14 @@ glusterd_nodesvc_rpc_notify (struct rpc_clnt *rpc, void *mydata,
 }
 
 int
+glusterd_nodesvc_rpc_notify (struct rpc_clnt *rpc, void *mydata,
+                             rpc_clnt_event_t event, void *data)
+{
+        return glusterd_big_locked_notify (rpc, mydata, event, data,
+                                           __glusterd_nodesvc_rpc_notify);
+}
+
+int
 glusterd_friend_remove_notify (glusterd_peerctx_t *peerctx)
 {
         int                             ret = -1;
@@ -3162,11 +3998,13 @@ glusterd_friend_remove_notify (glusterd_peerctx_t *peerctx)
         glusterd_peerinfo_t             *peerinfo = peerctx->peerinfo;
         rpcsvc_request_t                *req = peerctx->args.req;
         char                            *errstr = peerctx->errstr;
+        dict_t                          *dict = NULL;
 
         GF_ASSERT (peerctx);
 
         peerinfo = peerctx->peerinfo;
         req = peerctx->args.req;
+        dict = peerctx->args.dict;
         errstr = peerctx->errstr;
 
         ret = glusterd_friend_sm_new_event (GD_FRIEND_EVENT_REMOVE_FRIEND,
@@ -3180,7 +4018,8 @@ glusterd_friend_remove_notify (glusterd_peerctx_t *peerctx)
                 }
 
                 glusterd_xfer_cli_probe_resp (req, -1, ENOTCONN, errstr,
-                                              peerinfo->hostname, peerinfo->port);
+                                              peerinfo->hostname,
+                                              peerinfo->port, dict);
 
                 new_event->peerinfo = peerinfo;
                 ret = glusterd_friend_sm_inject_event (new_event);
@@ -3196,17 +4035,16 @@ out:
 }
 
 int
-glusterd_peer_rpc_notify (struct rpc_clnt *rpc, void *mydata,
-                          rpc_clnt_event_t event,
-                          void *data)
+__glusterd_peer_rpc_notify (struct rpc_clnt *rpc, void *mydata,
+                            rpc_clnt_event_t event, void *data)
 {
         xlator_t             *this        = NULL;
         glusterd_conf_t      *conf        = NULL;
         int                   ret         = 0;
         glusterd_peerinfo_t  *peerinfo    = NULL;
         glusterd_peerctx_t   *peerctx     = NULL;
-        uuid_t               *peer_uuid   = NULL;
         gf_boolean_t         quorum_action = _gf_false;
+        glusterd_volinfo_t   *volinfo     = NULL;
 
         peerctx = mydata;
         if (!peerctx)
@@ -3234,6 +4072,20 @@ glusterd_peer_rpc_notify (struct rpc_clnt *rpc, void *mydata,
                 gf_log (this->name, GF_LOG_DEBUG, "got RPC_CLNT_DISCONNECT %d",
                         peerinfo->state.state);
 
+                if (peerinfo->connected) {
+                        list_for_each_entry (volinfo, &conf->volumes, vol_list) {
+                                ret = glusterd_mgmt_v3_unlock (volinfo->volname,
+                                                               peerinfo->uuid,
+                                                               "vol");
+                                if (ret)
+                                        gf_log (this->name, GF_LOG_TRACE,
+                                                "Lock not released for %s",
+                                                volinfo->volname);
+                        }
+
+                        ret = 0;
+                }
+
                 if ((peerinfo->quorum_contrib != QUORUM_DOWN) &&
                     (peerinfo->state.state == GD_FRIEND_STATE_BEFRIENDED)) {
                         peerinfo->quorum_contrib = QUORUM_DOWN;
@@ -3241,64 +4093,15 @@ glusterd_peer_rpc_notify (struct rpc_clnt *rpc, void *mydata,
                         peerinfo->quorum_action = _gf_false;
                 }
 
-                // Remove peer if it is not a friend and connection/handshake
-                // fails, and notify cli. Happens only during probe.
+                /* Remove peer if it is not a friend and connection/handshake
+                *  fails, and notify cli. Happens only during probe.
+                */
                 if (peerinfo->state.state == GD_FRIEND_STATE_DEFAULT) {
                         glusterd_friend_remove_notify (peerctx);
                         goto out;
                 }
 
-                /*
-                  local glusterd (thinks that it) is the owner of the cluster
-                  lock and 'fails' the operation on the first disconnect from
-                  a peer.
-                */
-                if (peerinfo->connected) {
-                        /*TODO: The following is needed till all volume
-                         * operations are synctaskized.
-                         * */
-                        if (is_origin_glusterd ()) {
-                                switch (glusterd_op_get_op ()) {
-                                case GD_OP_START_VOLUME:
-                                case GD_OP_ADD_BRICK:
-                                case GD_OP_REMOVE_BRICK:
-                                case GD_OP_STATUS_VOLUME:
-                                        break;
-
-                                default:
-                                        ret = glusterd_op_sm_inject_event
-                                              (GD_OP_EVENT_START_UNLOCK, NULL);
-                                        if (ret)
-                                                gf_log (this->name,
-                                                        GF_LOG_ERROR,
-                                                        "Unable to enqueue "
-                                                        "cluster unlock event");
-
-                                        break;
-                                }
-
-                        } else {
-                                peer_uuid = GF_CALLOC (1, sizeof (*peer_uuid),
-                                                       gf_common_mt_char);
-
-                                if (peer_uuid) {
-                                        uuid_copy (*peer_uuid, peerinfo->uuid);
-                                        ret = glusterd_op_sm_inject_event
-                                              (GD_OP_EVENT_LOCAL_UNLOCK_NO_RESP,
-                                               peer_uuid);
-                                        if (ret)
-                                                gf_log (this->name,
-                                                        GF_LOG_ERROR,
-                                                        "Unable to enqueue "
-                                                        "local lock flush "
-                                                        "event.");
-                                }
-                        }
-
-                }
-
                 peerinfo->connected = 0;
-                //default_notify (this, GF_EVENT_CHILD_DOWN, NULL);
                 break;
         }
         default:
@@ -3317,6 +4120,14 @@ out:
 }
 
 int
+glusterd_peer_rpc_notify (struct rpc_clnt *rpc, void *mydata,
+                          rpc_clnt_event_t event, void *data)
+{
+        return glusterd_big_locked_notify (rpc, mydata, event, data,
+                                           __glusterd_peer_rpc_notify);
+}
+
+int
 glusterd_null (rpcsvc_request_t *req)
 {
 
@@ -3324,11 +4135,11 @@ glusterd_null (rpcsvc_request_t *req)
 }
 
 rpcsvc_actor_t gd_svc_mgmt_actors[] = {
-        [GLUSTERD_MGMT_NULL]           = { "NULL", GLUSTERD_MGMT_NULL, glusterd_null, NULL, 0},
-        [GLUSTERD_MGMT_CLUSTER_LOCK]   = { "CLUSTER_LOCK", GLUSTERD_MGMT_CLUSTER_LOCK, glusterd_handle_cluster_lock, NULL, 0},
-        [GLUSTERD_MGMT_CLUSTER_UNLOCK] = { "CLUSTER_UNLOCK", GLUSTERD_MGMT_CLUSTER_UNLOCK, glusterd_handle_cluster_unlock, NULL, 0},
-        [GLUSTERD_MGMT_STAGE_OP]       = { "STAGE_OP", GLUSTERD_MGMT_STAGE_OP, glusterd_handle_stage_op, NULL, 0},
-        [GLUSTERD_MGMT_COMMIT_OP]      = { "COMMIT_OP", GLUSTERD_MGMT_COMMIT_OP, glusterd_handle_commit_op, NULL, 0},
+        [GLUSTERD_MGMT_NULL]           = { "NULL",           GLUSTERD_MGMT_NULL,           glusterd_null,                  NULL, 0, DRC_NA},
+        [GLUSTERD_MGMT_CLUSTER_LOCK]   = { "CLUSTER_LOCK",   GLUSTERD_MGMT_CLUSTER_LOCK,   glusterd_handle_cluster_lock,   NULL, 0, DRC_NA},
+        [GLUSTERD_MGMT_CLUSTER_UNLOCK] = { "CLUSTER_UNLOCK", GLUSTERD_MGMT_CLUSTER_UNLOCK, glusterd_handle_cluster_unlock, NULL, 0, DRC_NA},
+        [GLUSTERD_MGMT_STAGE_OP]       = { "STAGE_OP",       GLUSTERD_MGMT_STAGE_OP,       glusterd_handle_stage_op,       NULL, 0, DRC_NA},
+        [GLUSTERD_MGMT_COMMIT_OP]      = { "COMMIT_OP",      GLUSTERD_MGMT_COMMIT_OP,      glusterd_handle_commit_op,      NULL, 0, DRC_NA},
 };
 
 struct rpcsvc_program gd_svc_mgmt_prog = {
@@ -3341,11 +4152,11 @@ struct rpcsvc_program gd_svc_mgmt_prog = {
 };
 
 rpcsvc_actor_t gd_svc_peer_actors[] = {
-        [GLUSTERD_FRIEND_NULL]    = { "NULL", GLUSTERD_MGMT_NULL, glusterd_null, NULL, 0},
-        [GLUSTERD_PROBE_QUERY]    = { "PROBE_QUERY", GLUSTERD_PROBE_QUERY, glusterd_handle_probe_query, NULL, 0},
-        [GLUSTERD_FRIEND_ADD]     = { "FRIEND_ADD", GLUSTERD_FRIEND_ADD, glusterd_handle_incoming_friend_req, NULL, 0},
-        [GLUSTERD_FRIEND_REMOVE]  = { "FRIEND_REMOVE", GLUSTERD_FRIEND_REMOVE, glusterd_handle_incoming_unfriend_req, NULL, 0},
-        [GLUSTERD_FRIEND_UPDATE]  = { "FRIEND_UPDATE", GLUSTERD_FRIEND_UPDATE, glusterd_handle_friend_update, NULL, 0},
+        [GLUSTERD_FRIEND_NULL]    = { "NULL",          GLUSTERD_MGMT_NULL,     glusterd_null,                         NULL, 0, DRC_NA},
+        [GLUSTERD_PROBE_QUERY]    = { "PROBE_QUERY",   GLUSTERD_PROBE_QUERY,   glusterd_handle_probe_query,           NULL, 0, DRC_NA},
+        [GLUSTERD_FRIEND_ADD]     = { "FRIEND_ADD",    GLUSTERD_FRIEND_ADD,    glusterd_handle_incoming_friend_req,   NULL, 0, DRC_NA},
+        [GLUSTERD_FRIEND_REMOVE]  = { "FRIEND_REMOVE", GLUSTERD_FRIEND_REMOVE, glusterd_handle_incoming_unfriend_req, NULL, 0, DRC_NA},
+        [GLUSTERD_FRIEND_UPDATE]  = { "FRIEND_UPDATE", GLUSTERD_FRIEND_UPDATE, glusterd_handle_friend_update,         NULL, 0, DRC_NA},
 };
 
 struct rpcsvc_program gd_svc_peer_prog = {
@@ -3360,38 +4171,39 @@ struct rpcsvc_program gd_svc_peer_prog = {
 
 
 rpcsvc_actor_t gd_svc_cli_actors[] = {
-        [GLUSTER_CLI_PROBE]         = { "CLI_PROBE", GLUSTER_CLI_PROBE, glusterd_handle_cli_probe, NULL, 0},
-        [GLUSTER_CLI_CREATE_VOLUME] = { "CLI_CREATE_VOLUME", GLUSTER_CLI_CREATE_VOLUME, glusterd_handle_create_volume, NULL, 0},
-        [GLUSTER_CLI_DEFRAG_VOLUME] = { "CLI_DEFRAG_VOLUME", GLUSTER_CLI_DEFRAG_VOLUME, glusterd_handle_defrag_volume, NULL, 0},
-        [GLUSTER_CLI_DEPROBE]       = { "FRIEND_REMOVE", GLUSTER_CLI_DEPROBE, glusterd_handle_cli_deprobe, NULL, 0},
-        [GLUSTER_CLI_LIST_FRIENDS]  = { "LIST_FRIENDS", GLUSTER_CLI_LIST_FRIENDS, glusterd_handle_cli_list_friends, NULL, 0},
-        [GLUSTER_CLI_UUID_RESET]    = { "UUID_RESET", GLUSTER_CLI_UUID_RESET, glusterd_handle_cli_uuid_reset, NULL, 0},
-        [GLUSTER_CLI_START_VOLUME]  = { "START_VOLUME", GLUSTER_CLI_START_VOLUME, glusterd_handle_cli_start_volume, NULL, 0},
-        [GLUSTER_CLI_STOP_VOLUME]   = { "STOP_VOLUME", GLUSTER_CLI_STOP_VOLUME, glusterd_handle_cli_stop_volume, NULL, 0},
-        [GLUSTER_CLI_DELETE_VOLUME] = { "DELETE_VOLUME", GLUSTER_CLI_DELETE_VOLUME, glusterd_handle_cli_delete_volume, NULL, 0},
-        [GLUSTER_CLI_GET_VOLUME]    = { "GET_VOLUME", GLUSTER_CLI_GET_VOLUME, glusterd_handle_cli_get_volume, NULL, 0},
-        [GLUSTER_CLI_ADD_BRICK]     = { "ADD_BRICK", GLUSTER_CLI_ADD_BRICK, glusterd_handle_add_brick, NULL, 0},
-        [GLUSTER_CLI_REPLACE_BRICK] = { "REPLACE_BRICK", GLUSTER_CLI_REPLACE_BRICK, glusterd_handle_replace_brick, NULL, 0},
-        [GLUSTER_CLI_REMOVE_BRICK]  = { "REMOVE_BRICK", GLUSTER_CLI_REMOVE_BRICK, glusterd_handle_remove_brick, NULL, 0},
-        [GLUSTER_CLI_LOG_ROTATE]    = { "LOG FILENAME", GLUSTER_CLI_LOG_ROTATE, glusterd_handle_log_rotate, NULL, 0},
-        [GLUSTER_CLI_SET_VOLUME]    = { "SET_VOLUME", GLUSTER_CLI_SET_VOLUME, glusterd_handle_set_volume, NULL, 0},
-        [GLUSTER_CLI_SYNC_VOLUME]   = { "SYNC_VOLUME", GLUSTER_CLI_SYNC_VOLUME, glusterd_handle_sync_volume, NULL, 0},
-        [GLUSTER_CLI_RESET_VOLUME]  = { "RESET_VOLUME", GLUSTER_CLI_RESET_VOLUME, glusterd_handle_reset_volume, NULL, 0},
-        [GLUSTER_CLI_FSM_LOG]       = { "FSM_LOG", GLUSTER_CLI_FSM_LOG, glusterd_handle_fsm_log, NULL, 0},
-        [GLUSTER_CLI_GSYNC_SET]     = { "GSYNC_SET", GLUSTER_CLI_GSYNC_SET, glusterd_handle_gsync_set, NULL, 0},
-        [GLUSTER_CLI_PROFILE_VOLUME] = { "STATS_VOLUME", GLUSTER_CLI_PROFILE_VOLUME, glusterd_handle_cli_profile_volume, NULL, 0},
-        [GLUSTER_CLI_QUOTA]         = { "QUOTA", GLUSTER_CLI_QUOTA, glusterd_handle_quota, NULL, 0},
-        [GLUSTER_CLI_GETWD]         = { "GETWD", GLUSTER_CLI_GETWD, glusterd_handle_getwd, NULL, 1},
-        [GLUSTER_CLI_STATUS_VOLUME]  = {"STATUS_VOLUME", GLUSTER_CLI_STATUS_VOLUME, glusterd_handle_status_volume, NULL, 0},
-        [GLUSTER_CLI_MOUNT]         = { "MOUNT", GLUSTER_CLI_MOUNT, glusterd_handle_mount, NULL, 1},
-        [GLUSTER_CLI_UMOUNT]        = { "UMOUNT", GLUSTER_CLI_UMOUNT, glusterd_handle_umount, NULL, 1},
-        [GLUSTER_CLI_HEAL_VOLUME]  = { "HEAL_VOLUME", GLUSTER_CLI_HEAL_VOLUME, glusterd_handle_cli_heal_volume, NULL, 0},
-        [GLUSTER_CLI_STATEDUMP_VOLUME] = {"STATEDUMP_VOLUME", GLUSTER_CLI_STATEDUMP_VOLUME, glusterd_handle_cli_statedump_volume, NULL, 0},
-        [GLUSTER_CLI_LIST_VOLUME] = {"LIST_VOLUME", GLUSTER_CLI_LIST_VOLUME, glusterd_handle_cli_list_volume, NULL, 0},
-        [GLUSTER_CLI_CLRLOCKS_VOLUME] = {"CLEARLOCKS_VOLUME", GLUSTER_CLI_CLRLOCKS_VOLUME, glusterd_handle_cli_clearlocks_volume, NULL, 0},
-#ifdef HAVE_BD_XLATOR
-        [GLUSTER_CLI_BD_OP]       = {"BD_OP", GLUSTER_CLI_BD_OP, glusterd_handle_cli_bd_op, NULL, 0},
-#endif
+        [GLUSTER_CLI_PROBE]              = { "CLI_PROBE",         GLUSTER_CLI_PROBE,            glusterd_handle_cli_probe,             NULL, 0, DRC_NA},
+        [GLUSTER_CLI_CREATE_VOLUME]      = { "CLI_CREATE_VOLUME", GLUSTER_CLI_CREATE_VOLUME,    glusterd_handle_create_volume,         NULL, 0, DRC_NA},
+        [GLUSTER_CLI_DEFRAG_VOLUME]      = { "CLI_DEFRAG_VOLUME", GLUSTER_CLI_DEFRAG_VOLUME,    glusterd_handle_defrag_volume,         NULL, 0, DRC_NA},
+        [GLUSTER_CLI_DEPROBE]            = { "FRIEND_REMOVE",     GLUSTER_CLI_DEPROBE,          glusterd_handle_cli_deprobe,           NULL, 0, DRC_NA},
+        [GLUSTER_CLI_LIST_FRIENDS]       = { "LIST_FRIENDS",      GLUSTER_CLI_LIST_FRIENDS,     glusterd_handle_cli_list_friends,      NULL, 0, DRC_NA},
+        [GLUSTER_CLI_UUID_RESET]         = { "UUID_RESET",        GLUSTER_CLI_UUID_RESET,       glusterd_handle_cli_uuid_reset,        NULL, 0, DRC_NA},
+        [GLUSTER_CLI_UUID_GET]           = { "UUID_GET",          GLUSTER_CLI_UUID_GET,         glusterd_handle_cli_uuid_get,          NULL, 0, DRC_NA},
+        [GLUSTER_CLI_START_VOLUME]       = { "START_VOLUME",      GLUSTER_CLI_START_VOLUME,     glusterd_handle_cli_start_volume,      NULL, 0, DRC_NA},
+        [GLUSTER_CLI_STOP_VOLUME]        = { "STOP_VOLUME",       GLUSTER_CLI_STOP_VOLUME,      glusterd_handle_cli_stop_volume,       NULL, 0, DRC_NA},
+        [GLUSTER_CLI_DELETE_VOLUME]      = { "DELETE_VOLUME",     GLUSTER_CLI_DELETE_VOLUME,    glusterd_handle_cli_delete_volume,     NULL, 0, DRC_NA},
+        [GLUSTER_CLI_GET_VOLUME]         = { "GET_VOLUME",        GLUSTER_CLI_GET_VOLUME,       glusterd_handle_cli_get_volume,        NULL, 0, DRC_NA},
+        [GLUSTER_CLI_ADD_BRICK]          = { "ADD_BRICK",         GLUSTER_CLI_ADD_BRICK,        glusterd_handle_add_brick,             NULL, 0, DRC_NA},
+        [GLUSTER_CLI_REPLACE_BRICK]      = { "REPLACE_BRICK",     GLUSTER_CLI_REPLACE_BRICK,    glusterd_handle_replace_brick,         NULL, 0, DRC_NA},
+        [GLUSTER_CLI_REMOVE_BRICK]       = { "REMOVE_BRICK",      GLUSTER_CLI_REMOVE_BRICK,     glusterd_handle_remove_brick,          NULL, 0, DRC_NA},
+        [GLUSTER_CLI_LOG_ROTATE]         = { "LOG FILENAME",      GLUSTER_CLI_LOG_ROTATE,       glusterd_handle_log_rotate,            NULL, 0, DRC_NA},
+        [GLUSTER_CLI_SET_VOLUME]         = { "SET_VOLUME",        GLUSTER_CLI_SET_VOLUME,       glusterd_handle_set_volume,            NULL, 0, DRC_NA},
+        [GLUSTER_CLI_SYNC_VOLUME]        = { "SYNC_VOLUME",       GLUSTER_CLI_SYNC_VOLUME,      glusterd_handle_sync_volume,           NULL, 0, DRC_NA},
+        [GLUSTER_CLI_RESET_VOLUME]       = { "RESET_VOLUME",      GLUSTER_CLI_RESET_VOLUME,     glusterd_handle_reset_volume,          NULL, 0, DRC_NA},
+        [GLUSTER_CLI_FSM_LOG]            = { "FSM_LOG",           GLUSTER_CLI_FSM_LOG,          glusterd_handle_fsm_log,               NULL, 0, DRC_NA},
+        [GLUSTER_CLI_GSYNC_SET]          = { "GSYNC_SET",         GLUSTER_CLI_GSYNC_SET,        glusterd_handle_gsync_set,             NULL, 0, DRC_NA},
+        [GLUSTER_CLI_PROFILE_VOLUME]     = { "STATS_VOLUME",      GLUSTER_CLI_PROFILE_VOLUME,   glusterd_handle_cli_profile_volume,    NULL, 0, DRC_NA},
+        [GLUSTER_CLI_QUOTA]              = { "QUOTA",             GLUSTER_CLI_QUOTA,            glusterd_handle_quota,                 NULL, 0, DRC_NA},
+        [GLUSTER_CLI_GETWD]              = { "GETWD",             GLUSTER_CLI_GETWD,            glusterd_handle_getwd,                 NULL, 1, DRC_NA},
+        [GLUSTER_CLI_STATUS_VOLUME]      = {"STATUS_VOLUME",      GLUSTER_CLI_STATUS_VOLUME,    glusterd_handle_status_volume,         NULL, 0, DRC_NA},
+        [GLUSTER_CLI_MOUNT]              = { "MOUNT",             GLUSTER_CLI_MOUNT,            glusterd_handle_mount,                 NULL, 1, DRC_NA},
+        [GLUSTER_CLI_UMOUNT]             = { "UMOUNT",            GLUSTER_CLI_UMOUNT,           glusterd_handle_umount,                NULL, 1, DRC_NA},
+        [GLUSTER_CLI_HEAL_VOLUME]        = { "HEAL_VOLUME",       GLUSTER_CLI_HEAL_VOLUME,      glusterd_handle_cli_heal_volume,       NULL, 0, DRC_NA},
+        [GLUSTER_CLI_STATEDUMP_VOLUME]   = {"STATEDUMP_VOLUME",   GLUSTER_CLI_STATEDUMP_VOLUME, glusterd_handle_cli_statedump_volume,  NULL, 0, DRC_NA},
+        [GLUSTER_CLI_LIST_VOLUME]        = {"LIST_VOLUME",        GLUSTER_CLI_LIST_VOLUME,      glusterd_handle_cli_list_volume,       NULL, 0, DRC_NA},
+        [GLUSTER_CLI_CLRLOCKS_VOLUME]    = {"CLEARLOCKS_VOLUME",  GLUSTER_CLI_CLRLOCKS_VOLUME,  glusterd_handle_cli_clearlocks_volume, NULL, 0, DRC_NA},
+        [GLUSTER_CLI_COPY_FILE]          = {"COPY_FILE",          GLUSTER_CLI_COPY_FILE,        glusterd_handle_copy_file,             NULL, 0, DRC_NA},
+        [GLUSTER_CLI_SYS_EXEC]           = {"SYS_EXEC",           GLUSTER_CLI_SYS_EXEC,         glusterd_handle_sys_exec,              NULL, 0, DRC_NA},
+        [GLUSTER_CLI_SNAP]               = {"SNAP",               GLUSTER_CLI_SNAP,             glusterd_handle_snapshot,              NULL, 0, DRC_NA},
 };
 
 struct rpcsvc_program gd_svc_cli_prog = {
@@ -3402,3 +4214,24 @@ struct rpcsvc_program gd_svc_cli_prog = {
         .actors    = gd_svc_cli_actors,
 	.synctask  = _gf_true,
 };
+
+/* This is a minimal RPC prog, which contains only the readonly RPC procs from
+ * the cli rpcsvc
+ */
+rpcsvc_actor_t gd_svc_cli_actors_ro[] = {
+        [GLUSTER_CLI_LIST_FRIENDS]       = { "LIST_FRIENDS",      GLUSTER_CLI_LIST_FRIENDS,     glusterd_handle_cli_list_friends,      NULL, 0, DRC_NA},
+        [GLUSTER_CLI_UUID_GET]           = { "UUID_GET",          GLUSTER_CLI_UUID_GET,         glusterd_handle_cli_uuid_get,          NULL, 0, DRC_NA},
+        [GLUSTER_CLI_GET_VOLUME]         = { "GET_VOLUME",        GLUSTER_CLI_GET_VOLUME,       glusterd_handle_cli_get_volume,        NULL, 0, DRC_NA},
+        [GLUSTER_CLI_GETWD]              = { "GETWD",             GLUSTER_CLI_GETWD,            glusterd_handle_getwd,                 NULL, 1, DRC_NA},
+        [GLUSTER_CLI_STATUS_VOLUME]      = {"STATUS_VOLUME",      GLUSTER_CLI_STATUS_VOLUME,    glusterd_handle_status_volume,         NULL, 0, DRC_NA},
+        [GLUSTER_CLI_LIST_VOLUME]        = {"LIST_VOLUME",        GLUSTER_CLI_LIST_VOLUME,      glusterd_handle_cli_list_volume,       NULL, 0, DRC_NA},
+};
+
+struct rpcsvc_program gd_svc_cli_prog_ro = {
+        .progname  = "GlusterD svc cli read-only",
+        .prognum   = GLUSTER_CLI_PROGRAM,
+        .progver   = GLUSTER_CLI_VERSION,
+        .numactors = GLUSTER_CLI_MAXVALUE,
+        .actors    = gd_svc_cli_actors_ro,
+	.synctask  = _gf_true,
+};
diff --git a/xlators/mgmt/glusterd/src/glusterd-handshake.c b/xlators/mgmt/glusterd/src/glusterd-handshake.c
index 8b9647026..0f0357c4c 100644
--- a/xlators/mgmt/glusterd/src/glusterd-handshake.c
+++ b/xlators/mgmt/glusterd/src/glusterd-handshake.c
@@ -30,26 +30,147 @@
 
 extern struct rpc_clnt_program gd_peer_prog;
 extern struct rpc_clnt_program gd_mgmt_prog;
+extern struct rpc_clnt_program gd_mgmt_v3_prog;
+extern struct rpc_clnt_program gd_mgmt_v3_prog;
+
 
 #define TRUSTED_PREFIX         "trusted-"
 
 typedef ssize_t (*gfs_serialize_t) (struct iovec outmsg, void *data);
 
+static int
+get_snap_volname_and_volinfo (const char *volpath, char **volname,
+                              glusterd_volinfo_t **volinfo)
+{
+        int              ret            = -1;
+        char            *save_ptr       = NULL;
+        char            *str_token      = NULL;
+        char            *snapname       = NULL;
+        char            *volname_token  = NULL;
+        char            *vol            = NULL;
+        glusterd_snap_t *snap           = NULL;
+        xlator_t        *this           = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (volpath);
+        GF_ASSERT (volinfo);
+
+        str_token = gf_strdup (volpath);
+        if (NULL == str_token) {
+                goto out;
+        }
+
+        /* Input volname will have below formats:
+         * /snaps/<snapname>/<volname>.<hostname>
+         * or
+         * /snaps/<snapname>/<parent-volname>
+         * We need to extract snapname and parent_volname */
+
+        /*split string by "/" */
+        strtok_r (str_token, "/",  &save_ptr);
+        snapname  = strtok_r(NULL, "/", &save_ptr);
+        if (!snapname) {
+                gf_log(this->name, GF_LOG_ERROR, "Invalid path: %s", volpath);
+                goto out;
+        }
+
+        volname_token = strtok_r(NULL, "/", &save_ptr);
+        if (!volname_token) {
+                gf_log(this->name, GF_LOG_ERROR, "Invalid path: %s", volpath);
+                goto out;
+        }
+
+        snap = glusterd_find_snap_by_name (snapname);
+        if (!snap) {
+                gf_log(this->name, GF_LOG_ERROR, "Failed to "
+                                "fetch snap %s", snapname);
+                goto out;
+        }
+
+        /* Find if its a parent volume name or snap volume
+         * name. This function will succeed if volname_token
+         * is a parent volname
+         */
+        ret = glusterd_volinfo_find (volname_token, volinfo);
+        if (ret) {
+                *volname = gf_strdup (volname_token);
+                if (NULL == *volname) {
+                        ret = -1;
+                        goto out;
+                }
+
+                ret = glusterd_snap_volinfo_find (volname_token, snap,
+                                                  volinfo);
+                if (ret) {
+                        /* Split the volume name */
+                        vol = strtok_r (volname_token, ".", &save_ptr);
+                        if (!vol) {
+                                gf_log(this->name, GF_LOG_ERROR, "Invalid "
+                                                "volname (%s)", volname_token);
+                                goto out;
+                        }
+
+                        ret = glusterd_snap_volinfo_find (vol, snap, volinfo);
+                        if (ret) {
+                                gf_log(this->name, GF_LOG_ERROR, "Failed to "
+                                       "fetch snap volume from volname (%s)",
+                                       vol);
+                                goto out;
+                        }
+                }
+        } else {
+                /*volname_token is parent volname*/
+                ret = glusterd_snap_volinfo_find_from_parent_volname (
+                                volname_token, snap, volinfo);
+                if (ret) {
+                        gf_log(this->name, GF_LOG_ERROR, "Failed to "
+                                        "fetch snap volume from parent "
+                                        "volname (%s)", volname_token);
+                        goto out;
+                }
+
+                /* Since volname_token is a parent volname we should
+                 * get the snap volname here*/
+                *volname = gf_strdup ((*volinfo)->volname);
+                if (NULL == *volname) {
+                        ret = -1;
+                        goto out;
+                }
+        }
+
+out:
+        if (ret && NULL != *volname) {
+                GF_FREE (*volname);
+                *volname = NULL;
+        }
+        return ret;
+}
+
 static size_t
 build_volfile_path (const char *volname, char *path,
                     size_t path_len, char *trusted_str)
 {
-        struct stat         stbuf       = {0,};
-        int32_t             ret         = -1;
-        glusterd_conf_t    *priv        = NULL;
-        char               *vol         = NULL;
-        char               *dup_volname = NULL;
-        char               *free_ptr    = NULL;
-        char               *tmp         = NULL;
-        glusterd_volinfo_t *volinfo     = NULL;
-        char               *server      = NULL;
-
-        priv    = THIS->private;
+        struct stat              stbuf                  = {0,};
+        int32_t                  ret                    = -1;
+        glusterd_conf_t         *priv                   = NULL;
+        char                    *vol                    = NULL;
+        char                    *dup_volname            = NULL;
+        char                    *free_ptr               = NULL;
+        char                    *save_ptr               = NULL;
+        char                    *str_token              = NULL;
+        glusterd_volinfo_t      *volinfo                = NULL;
+        char                    *server                 = NULL;
+        const char              *volname_ptr            = NULL;
+        char                     path_prefix [PATH_MAX] = {0,};
+        xlator_t                *this                   = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        priv = this->private;
+        GF_ASSERT (priv);
+        GF_ASSERT (volname);
+        GF_ASSERT (path);
 
         if (strstr (volname, "gluster/")) {
                 server = strchr (volname, '/') + 1;
@@ -57,6 +178,22 @@ build_volfile_path (const char *volname, char *path,
                                               path, path_len);
                 ret = 1;
                 goto out;
+        } else if ((str_token = strstr (volname, "/snaps/"))) {
+                ret = get_snap_volname_and_volinfo (str_token, &dup_volname,
+                                                    &volinfo);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR, "Failed to get snap"
+                                " volinfo from path (%s)", volname);
+                        ret = -1;
+                        goto out;
+                }
+
+                snprintf (path_prefix, sizeof (path_prefix), "%s/snaps/%s",
+                          priv->workdir, volinfo->snapshot->snapname);
+
+                free_ptr = dup_volname;
+                volname_ptr = dup_volname;
+                goto gotvolinfo;
         } else if (volname[0] != '/') {
                 /* Normal behavior */
                 dup_volname = gf_strdup (volname);
@@ -67,39 +204,53 @@ build_volfile_path (const char *volname, char *path,
                 dup_volname = gf_strdup (&volname[1]);
         }
 
+        if (!dup_volname) {
+                gf_log(THIS->name, GF_LOG_ERROR, "strdup failed");
+                ret = -1;
+                goto out;
+        }
         free_ptr = dup_volname;
+        volname_ptr = volname;
+
+        snprintf (path_prefix, sizeof (path_prefix), "%s/vols",
+                  priv->workdir);
 
         ret = glusterd_volinfo_find (dup_volname, &volinfo);
+
         if (ret) {
                 /* Split the volume name */
-                vol = strtok_r (dup_volname, ".", &tmp);
+                vol = strtok_r (dup_volname, ".", &save_ptr);
                 if (!vol)
                         goto out;
+
                 ret = glusterd_volinfo_find (vol, &volinfo);
                 if (ret)
                         goto out;
         }
 
+gotvolinfo:
         if (!glusterd_auth_get_username (volinfo))
                 trusted_str = NULL;
 
-        ret = snprintf (path, path_len, "%s/vols/%s/%s.vol",
-                        priv->workdir, volinfo->volname, volname);
+        ret = snprintf (path, path_len, "%s/%s/%s.vol", path_prefix,
+                        volinfo->volname, volname_ptr);
         if (ret == -1)
                 goto out;
 
         ret = stat (path, &stbuf);
 
         if ((ret == -1) && (errno == ENOENT)) {
-                snprintf (path, path_len, "%s/vols/%s/%s%s-fuse.vol",
-                          priv->workdir, volinfo->volname,
-                          (trusted_str ? trusted_str : ""), dup_volname);
+                snprintf (path, path_len, "%s/%s/%s%s-fuse.vol",
+                          path_prefix, volinfo->volname,
+                          (trusted_str ? trusted_str : ""),
+                          dup_volname);
+
                 ret = stat (path, &stbuf);
         }
 
         if ((ret == -1) && (errno == ENOENT)) {
-                snprintf (path, path_len, "%s/vols/%s/%s-tcp.vol",
-                          priv->workdir, volinfo->volname, volname);
+                snprintf (path, path_len, "%s/%s/%s-tcp.vol",
+                          path_prefix, volinfo->volname, volname_ptr);
         }
 
         ret = 1;
@@ -108,124 +259,158 @@ out:
         return ret;
 }
 
-int
-server_getspec (rpcsvc_request_t *req)
+/* Get and store op-versions of the clients sending the getspec request
+ * Clients of versions <= 3.3, don't send op-versions, their op-versions are
+ * defaulted to 1
+ */
+static int
+_get_client_op_versions (gf_getspec_req *args, peer_info_t *peerinfo)
 {
-        int32_t               ret                    = -1;
-        int32_t               op_errno               = 0;
-        int32_t               spec_fd                = -1;
-        size_t                file_len               = 0;
-        char                  filename[PATH_MAX]  = {0,};
-        struct stat           stbuf                  = {0,};
-        char                 *volume                 = NULL;
-        char                 *tmp                    = NULL;
-        int                   cookie                 = 0;
-        rpc_transport_t      *trans                  = NULL;
-        gf_getspec_req        args                   = {0,};
-        gf_getspec_rsp        rsp                    = {0,};
-        char                  addrstr[RPCSVC_PEER_STRLEN] = {0};
-        dict_t               *dict                   = NULL;
-        xlator_t             *this                   = NULL;
-        glusterd_conf_t      *conf                   = NULL;
-        int                   client_min_op_version  = 1;       // OP-VERSIONs start at 1
-        int                   client_max_op_version  = 1;
+        int    ret                   = 0;
+        int    client_max_op_version = 1;
+        int    client_min_op_version = 1;
+        dict_t *dict                 = NULL;
 
-        this = THIS;
-        GF_ASSERT (this);
-
-        conf = this->private;
-        GF_ASSERT (conf);
+        GF_ASSERT (args);
+        GF_ASSERT (peerinfo);
 
-        ret = xdr_to_generic (req->msg[0], &args,
-                              (xdrproc_t)xdr_gf_getspec_req);
-        if (ret < 0) {
-                //failed to decode msg;
-                req->rpc_err = GARBAGE_ARGS;
-                goto fail;
-        }
-
-        if (!args.xdata.xdata_len) {
-                // For clients <= 3.3.0, only allow if op_version = 1
-                if (1 != conf->op_version) {
-                        ret = -1;
-                        op_errno = ENOTSUP;
-                        gf_log (this->name, GF_LOG_INFO,
-                                "Client %s doesn't support required op-version. "
-                                "Rejecting getspec request.",
-                                req->trans->peerinfo.identifier);
-                        goto fail;
-                }
-        } else {
-                // For clients > 3.3, only allow if they can support
-                // clusters' op_version
+        if (args->xdata.xdata_len) {
                 dict = dict_new ();
                 if (!dict) {
                         ret = -1;
-                        goto fail;
+                        goto out;
                 }
 
-                ret = dict_unserialize (args.xdata.xdata_val,
-                                        args.xdata.xdata_len, &dict);
+                ret = dict_unserialize (args->xdata.xdata_val,
+                                        args->xdata.xdata_len, &dict);
                 if (ret) {
-                        gf_log (this->name, GF_LOG_ERROR,
+                        gf_log ("glusterd", GF_LOG_ERROR,
                                 "Failed to unserialize request dictionary");
-                        goto fail;
+                        goto out;
                 }
 
                 ret = dict_get_int32 (dict, "min-op-version",
                                       &client_min_op_version);
                 if (ret) {
-                        gf_log (this->name, GF_LOG_ERROR,
+                        gf_log ("glusterd", GF_LOG_ERROR,
                                 "Failed to get client-min-op-version");
-                        goto fail;
+                        goto out;
                 }
 
                 ret = dict_get_int32 (dict, "max-op-version",
                                       &client_max_op_version);
                 if (ret) {
-                        gf_log (this->name, GF_LOG_ERROR,
+                        gf_log ("glusterd", GF_LOG_ERROR,
                                 "Failed to get client-max-op-version");
-                        goto fail;
+                        goto out;
                 }
+        }
+
+        peerinfo->max_op_version = client_max_op_version;
+        peerinfo->min_op_version = client_min_op_version;
+
+out:
+        return ret;
+}
+
+/* Checks if the client supports the volume, ie. client can understand all the
+ * options in the volfile
+ */
+static gf_boolean_t
+_client_supports_volume (peer_info_t *peerinfo, int32_t *op_errno)
+{
+        gf_boolean_t       ret       = _gf_true;
+        glusterd_volinfo_t *volinfo  = NULL;
+
+        GF_ASSERT (peerinfo);
+        GF_ASSERT (op_errno);
 
-                if ((client_min_op_version > conf->op_version) ||
-                    (client_max_op_version < conf->op_version)) {
-                        ret = -1;
-                        op_errno = ENOTSUP;
-                        //TODO: Add client identifier
-                        gf_log (this->name, GF_LOG_INFO,
-                                "Client %s doesn't support required op-version. "
-                                "Rejecting getspec request.",
-                                req->trans->peerinfo.identifier);
-                        goto fail;
-                }
 
+        /* Only check when the volfile being requested is a volume. Not finding
+         * a volinfo implies that the volfile requested for is not of a gluster
+         * volume. A non volume volfile is requested by the local gluster
+         * services like shd and nfs-server. These need not be checked as they
+         * will be running at the same op-version as glusterd and will be able
+         * to support all the features
+         */
+        if ((glusterd_volinfo_find (peerinfo->volname, &volinfo) == 0) &&
+            ((peerinfo->min_op_version > volinfo->client_op_version) ||
+             (peerinfo->max_op_version < volinfo->client_op_version))) {
+                ret = _gf_false;
+                *op_errno = ENOTSUP;
+                gf_log ("glusterd", GF_LOG_INFO,
+                        "Client %s (%d -> %d) doesn't support required "
+                        "op-version (%d). Rejecting volfile request.",
+                        peerinfo->identifier, peerinfo->min_op_version,
+                        peerinfo->max_op_version, volinfo->client_op_version);
         }
 
-        // Store the op-versions supported by the client
-        req->trans->peerinfo.max_op_version = client_max_op_version;
-        req->trans->peerinfo.min_op_version = client_min_op_version;
+        return ret;
+}
 
-        volume = args.key;
+int
+__server_getspec (rpcsvc_request_t *req)
+{
+        int32_t               ret                    = -1;
+        int32_t               op_errno               = 0;
+        int32_t               spec_fd                = -1;
+        size_t                file_len               = 0;
+        char                  filename[PATH_MAX]  = {0,};
+        struct stat           stbuf                  = {0,};
+        char                 *volume                 = NULL;
+        char                 *tmp                    = NULL;
+        int                   cookie                 = 0;
+        rpc_transport_t      *trans                  = NULL;
+        gf_getspec_req        args                   = {0,};
+        gf_getspec_rsp        rsp                    = {0,};
+        char                  addrstr[RPCSVC_PEER_STRLEN] = {0};
+        peer_info_t          *peerinfo               = NULL;
+
+        ret = xdr_to_generic (req->msg[0], &args,
+                              (xdrproc_t)xdr_gf_getspec_req);
+        if (ret < 0) {
+                //failed to decode msg;
+                req->rpc_err = GARBAGE_ARGS;
+                goto fail;
+        }
 
-        // Store the name of volume  being mounted
+        peerinfo = &req->trans->peerinfo;
+
+        volume = args.key;
+        /* Need to strip leading '/' from volnames. This was introduced to
+         * support nfs style mount parameters for native gluster mount
+         */
         if (volume[0] == '/')
-                strncpy (req->trans->peerinfo.volname, &volume[1],
-                         strlen(&volume[1]));
+                strncpy (peerinfo->volname, &volume[1], strlen(&volume[1]));
         else
-                strncpy (req->trans->peerinfo.volname, volume, strlen(volume));
+                strncpy (peerinfo->volname, volume, strlen(volume));
+
+        ret = _get_client_op_versions (&args, peerinfo);
+        if (ret)
+                goto fail;
+
+        if (!_client_supports_volume (peerinfo, &op_errno)) {
+                ret = -1;
+                goto fail;
+        }
 
         trans = req->trans;
+        /* addrstr will be empty for cli socket connections */
         ret = rpcsvc_transport_peername (trans, (char *)&addrstr,
                                          sizeof (addrstr));
         if (ret)
                 goto fail;
 
-        tmp = strrchr (addrstr, ':');
-        *tmp = '\0';
+        tmp  = strrchr (addrstr, ':');
+        if (tmp)
+                *tmp = '\0';
 
-        /* we trust the local admin */
-        if (glusterd_is_local_addr (addrstr)) {
+        /* The trusted volfiles are given to the glusterd owned process like NFS
+         * server, self-heal daemon etc., so that they are not inadvertently
+         * blocked by a auth.{allow,reject} setting. The trusted volfile is not
+         * meant for external users.
+         */
+        if (strlen (addrstr) && gf_is_local_addr (addrstr)) {
 
                 ret = build_volfile_path (volume, filename,
                                           sizeof (filename),
@@ -289,8 +474,14 @@ fail:
         return 0;
 }
 
+int
+server_getspec (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req, __server_getspec);
+}
+
 int32_t
-server_event_notify (rpcsvc_request_t *req)
+__server_event_notify (rpcsvc_request_t *req)
 {
         int32_t                 ret             = -1;
         int32_t                 op_errno        =  0;
@@ -350,6 +541,12 @@ fail:
         return 0;
 }
 
+int32_t
+server_event_notify (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req, __server_event_notify);
+}
+
 int
 gd_validate_cluster_op_version (xlator_t *this, int cluster_op_version,
                                 char *peerid)
@@ -368,12 +565,16 @@ gd_validate_cluster_op_version (xlator_t *this, int cluster_op_version,
                 goto out;
         }
 
-        if (cluster_op_version < conf->op_version) {
+        /* The peer can only reduce its op-version when it doesn't have any
+         * volumes. Reducing op-version when it already contains volumes can
+         * lead to inconsistencies in the cluster
+         */
+        if ((cluster_op_version < conf->op_version) &&
+            !list_empty (&conf->volumes)) {
                 gf_log (this->name, GF_LOG_ERROR,
-                        "operating version %d is less than the currently "
-                        "running version (%d) on the machine (as per peer "
-                        "request from %s)", cluster_op_version,
-                        conf->op_version, peerid);
+                        "cannot reduce operating version to %d from current "
+                        "version %d as volumes exist (as per peer request from "
+                        "%s)", cluster_op_version, conf->op_version, peerid);
                 goto out;
         }
 
@@ -383,7 +584,7 @@ out:
 }
 
 int
-glusterd_mgmt_hndsk_versions (rpcsvc_request_t *req)
+__glusterd_mgmt_hndsk_versions (rpcsvc_request_t *req)
 {
         dict_t            *dict            = NULL;
         xlator_t          *this            = NULL;
@@ -459,7 +660,14 @@ out:
 }
 
 int
-glusterd_mgmt_hndsk_versions_ack (rpcsvc_request_t *req)
+glusterd_mgmt_hndsk_versions (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req,
+                                            __glusterd_mgmt_hndsk_versions);
+}
+
+int
+__glusterd_mgmt_hndsk_versions_ack (rpcsvc_request_t *req)
 {
         dict_t            *clnt_dict       = NULL;
         xlator_t          *this            = NULL;
@@ -527,13 +735,17 @@ out:
         return ret;
 }
 
+int
+glusterd_mgmt_hndsk_versions_ack (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req,
+                                            __glusterd_mgmt_hndsk_versions_ack);
+}
 
 rpcsvc_actor_t gluster_handshake_actors[] = {
-        [GF_HNDSK_NULL]         = {"NULL", GF_HNDSK_NULL, NULL, NULL, 0},
-        [GF_HNDSK_GETSPEC]      = {"GETSPEC", GF_HNDSK_GETSPEC,
-                                   server_getspec, NULL, 0},
-        [GF_HNDSK_EVENT_NOTIFY] = {"EVENTNOTIFY", GF_HNDSK_EVENT_NOTIFY,
-                                   server_event_notify,  NULL, 0},
+        [GF_HNDSK_NULL]         = {"NULL",        GF_HNDSK_NULL,         NULL,                NULL, 0, DRC_NA},
+        [GF_HNDSK_GETSPEC]      = {"GETSPEC",     GF_HNDSK_GETSPEC,      server_getspec,      NULL, 0, DRC_NA},
+        [GF_HNDSK_EVENT_NOTIFY] = {"EVENTNOTIFY", GF_HNDSK_EVENT_NOTIFY, server_event_notify, NULL, 0, DRC_NA},
 };
 
 
@@ -545,6 +757,19 @@ struct rpcsvc_program gluster_handshake_prog = {
         .numactors = GF_HNDSK_MAXVALUE,
 };
 
+/* A minimal RPC program just for the cli getspec command */
+rpcsvc_actor_t gluster_cli_getspec_actors[] = {
+        [GF_HNDSK_GETSPEC]      = {"GETSPEC",     GF_HNDSK_GETSPEC,      server_getspec,      NULL, 0, DRC_NA},
+};
+
+struct rpcsvc_program gluster_cli_getspec_prog = {
+        .progname  = "Gluster Handshake (CLI Getspec)",
+        .prognum   = GLUSTER_HNDSK_PROGRAM,
+        .progver   = GLUSTER_HNDSK_VERSION,
+        .actors    = gluster_cli_getspec_actors,
+        .numactors = GF_HNDSK_MAXVALUE,
+};
+
 
 char *glusterd_dump_proc[GF_DUMP_MAXVALUE] = {
         [GF_DUMP_NULL] = "NULL",
@@ -624,6 +849,7 @@ glusterd_event_connected_inject (glusterd_peerctx_t *peerctx)
         ctx->hostname = gf_strdup (peerinfo->hostname);
         ctx->port = peerinfo->port;
         ctx->req = peerctx->args.req;
+        ctx->dict = peerctx->args.dict;
 
         event->peerinfo = peerinfo;
         event->ctx = ctx;
@@ -681,16 +907,6 @@ gd_validate_peer_op_version (xlator_t *this, glusterd_peerinfo_t *peerinfo,
                 goto out;
         }
 
-        /* If peer is already operating at a higher op_version reject it.
-         * Cluster cannot be moved to higher op_version to accomodate a peer.
-         */
-        if (peer_op_version > conf->op_version) {
-                ret = gf_asprintf (errstr, "Peer %s is already at a higher "
-                                   "op-version", peerinfo->hostname);
-                ret = -1;
-                goto out;
-        }
-
         ret = 0;
 out:
         gf_log (this->name , GF_LOG_DEBUG, "Peer %s %s", peerinfo->hostname,
@@ -699,7 +915,7 @@ out:
 }
 
 int
-glusterd_mgmt_hndsk_version_ack_cbk (struct rpc_req *req, struct iovec *iov,
+__glusterd_mgmt_hndsk_version_ack_cbk (struct rpc_req *req, struct iovec *iov,
                                      int count, void *myframe)
 {
         int                  ret      = -1;
@@ -747,6 +963,7 @@ glusterd_mgmt_hndsk_version_ack_cbk (struct rpc_req *req, struct iovec *iov,
          */
         peerinfo->mgmt = &gd_mgmt_prog;
         peerinfo->peer = &gd_peer_prog;
+        peerinfo->mgmt_v3 = &gd_mgmt_v3_prog;
 
         ret = default_notify (this, GF_EVENT_CHILD_UP, NULL);
 
@@ -778,7 +995,15 @@ out:
 }
 
 int
-glusterd_mgmt_hndsk_version_cbk (struct rpc_req *req, struct iovec *iov,
+glusterd_mgmt_hndsk_version_ack_cbk (struct rpc_req *req, struct iovec *iov,
+                                     int count, void *myframe)
+{
+        return glusterd_big_locked_cbk (req, iov, count, myframe,
+                                        __glusterd_mgmt_hndsk_version_ack_cbk);
+}
+
+int
+__glusterd_mgmt_hndsk_version_cbk (struct rpc_req *req, struct iovec *iov,
                                  int count, void *myframe)
 {
         int                  ret       = -1;
@@ -883,6 +1108,14 @@ out:
 }
 
 int
+glusterd_mgmt_hndsk_version_cbk (struct rpc_req *req, struct iovec *iov,
+                                     int count, void *myframe)
+{
+        return glusterd_big_locked_cbk (req, iov, count, myframe,
+                                        __glusterd_mgmt_hndsk_version_cbk);
+}
+
+int
 glusterd_mgmt_handshake (xlator_t *this, glusterd_peerctx_t *peerctx)
 {
         call_frame_t        *frame    = NULL;
@@ -957,6 +1190,14 @@ glusterd_set_clnt_mgmt_program (glusterd_peerinfo_t *peerinfo,
                          peerinfo->peer->progname, peerinfo->peer->prognum,
                          peerinfo->peer->progver);
         }
+
+        if (peerinfo->mgmt_v3) {
+                 gf_log ("", GF_LOG_INFO,
+                         "Using Program %s, Num (%d), Version (%d)",
+                         peerinfo->mgmt_v3->progname, peerinfo->mgmt_v3->prognum,
+                         peerinfo->mgmt_v3->progver);
+        }
+
         ret = 0;
 out:
         return ret;
@@ -985,7 +1226,7 @@ out:
 }
 
 int
-glusterd_peer_dump_version_cbk (struct rpc_req *req, struct iovec *iov,
+__glusterd_peer_dump_version_cbk (struct rpc_req *req, struct iovec *iov,
                                 int count, void *myframe)
 {
         int                  ret      = -1;
@@ -1092,6 +1333,14 @@ out:
 
 
 int
+glusterd_peer_dump_version_cbk (struct rpc_req *req, struct iovec *iov,
+                                int count, void *myframe)
+{
+        return glusterd_big_locked_cbk (req, iov, count, myframe,
+                                        __glusterd_peer_dump_version_cbk);
+}
+
+int
 glusterd_peer_dump_version (xlator_t *this, struct rpc_clnt *rpc,
                             glusterd_peerctx_t *peerctx)
 {
diff --git a/xlators/mgmt/glusterd/src/glusterd-hooks.c b/xlators/mgmt/glusterd/src/glusterd-hooks.c
index a61e1e85f..2b43a452e 100644
--- a/xlators/mgmt/glusterd/src/glusterd-hooks.c
+++ b/xlators/mgmt/glusterd/src/glusterd-hooks.c
@@ -49,6 +49,7 @@ char glusterd_hook_dirnames[GD_OP_MAX][256] =
         [GD_OP_RESET_VOLUME]            = EMPTY,
         [GD_OP_SYNC_VOLUME]             = EMPTY,
         [GD_OP_LOG_ROTATE]              = EMPTY,
+        [GD_OP_GSYNC_CREATE]            = "gsync-create",
         [GD_OP_GSYNC_SET]               = EMPTY,
         [GD_OP_PROFILE_VOLUME]          = EMPTY,
         [GD_OP_QUOTA]                   = EMPTY,
@@ -185,6 +186,7 @@ static int
 glusterd_hooks_add_op_args (runner_t *runner, glusterd_op_t op,
                             dict_t *op_ctx, glusterd_commit_hook_type_t type)
 {
+        char                   *hooks_args       = NULL;
         int                     vol_count        = 0;
         gf_boolean_t            truth            = _gf_false;
         glusterd_volinfo_t      *voliter         = NULL;
@@ -236,6 +238,18 @@ glusterd_hooks_add_op_args (runner_t *runner, glusterd_op_t op,
                         ret = glusterd_hooks_set_volume_args (op_ctx, runner);
                         break;
 
+                case GD_OP_GSYNC_CREATE:
+                        ret = dict_get_str (op_ctx, "hooks_args", &hooks_args);
+                        if (ret)
+                                gf_log ("", GF_LOG_DEBUG,
+                                        "No Hooks Arguments.");
+                        else
+                                gf_log ("", GF_LOG_DEBUG,
+                                        "Hooks Args = %s", hooks_args);
+                        if (hooks_args)
+                                runner_argprintf (runner, "%s", hooks_args);
+                        break;
+
                 default:
                         break;
 
diff --git a/xlators/mgmt/glusterd/src/glusterd-locks.c b/xlators/mgmt/glusterd/src/glusterd-locks.c
new file mode 100644
index 000000000..0af2a186f
--- /dev/null
+++ b/xlators/mgmt/glusterd/src/glusterd-locks.c
@@ -0,0 +1,637 @@
+/*
+   Copyright (c) 2013-2014 Red Hat, Inc. <http://www.redhat.com>
+   This file is part of GlusterFS.
+
+   This file is licensed to you under your choice of the GNU Lesser
+   General Public License, version 3 or any later version (LGPLv3 or
+   later), or the GNU General Public License, version 2 (GPLv2), in all
+   cases as published by the Free Software Foundation.
+*/
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+
+#include "common-utils.h"
+#include "cli1-xdr.h"
+#include "xdr-generic.h"
+#include "glusterd.h"
+#include "glusterd-op-sm.h"
+#include "glusterd-store.h"
+#include "glusterd-utils.h"
+#include "glusterd-volgen.h"
+#include "glusterd-locks.h"
+#include "run.h"
+#include "syscall.h"
+
+#include <signal.h>
+
+#define GF_MAX_LOCKING_ENTITIES 2
+
+/* Valid entities that the mgmt_v3 lock can hold locks upon    *
+ * To add newer entities to be locked, we can just add more    *
+ * entries to this table along with the type and default value */
+valid_entities   valid_types[] = {
+        { "vol",  _gf_true  },
+        { "snap", _gf_false },
+        { NULL              },
+};
+
+static dict_t *mgmt_v3_lock;
+
+/* Checks if the lock request is for a valid entity */
+gf_boolean_t
+glusterd_mgmt_v3_is_type_valid (char *type)
+{
+        int32_t         i   = 0;
+        gf_boolean_t    ret = _gf_false;
+
+        GF_ASSERT (type);
+
+        for (i = 0; valid_types[i].type; i++) {
+                if (!strcmp (type, valid_types[i].type)) {
+                        ret = _gf_true;
+                        break;
+                }
+        }
+
+        return ret;
+}
+
+/* Initialize the global mgmt_v3 lock list(dict) when
+ * glusterd is spawned */
+int32_t
+glusterd_mgmt_v3_lock_init ()
+{
+        int32_t ret = -1;
+
+        mgmt_v3_lock = dict_new ();
+        if (!mgmt_v3_lock) {
+                ret = -1;
+                goto out;
+        }
+
+        ret = 0;
+out:
+        return ret;
+}
+
+/* Destroy the global mgmt_v3 lock list(dict) when
+ * glusterd cleanup is performed */
+void
+glusterd_mgmt_v3_lock_fini ()
+{
+        if (mgmt_v3_lock)
+                dict_destroy (mgmt_v3_lock);
+}
+
+int32_t
+glusterd_get_mgmt_v3_lock_owner (char *key, uuid_t *uuid)
+{
+        int32_t             ret      = -1;
+        mgmt_v3_lock_obj   *lock_obj = NULL;
+        uuid_t              no_owner = {"\0"};
+        xlator_t           *this = NULL;
+
+        GF_ASSERT(THIS);
+        this = THIS;
+
+        if (!key || !uuid) {
+                gf_log (this->name, GF_LOG_ERROR, "key or uuid is null.");
+                ret = -1;
+                goto out;
+        }
+
+        ret = dict_get_bin(mgmt_v3_lock, key, (void **) &lock_obj);
+        if (!ret)
+                uuid_copy (*uuid, lock_obj->lock_owner);
+        else
+                uuid_copy (*uuid, no_owner);
+
+        ret = 0;
+out:
+        gf_log (this->name, GF_LOG_TRACE, "Returning %d", ret);
+        return ret;
+}
+
+/* This function is called with the locked_count and type, to   *
+ * release all the acquired locks. */
+static int32_t
+glusterd_release_multiple_locks_per_entity (dict_t *dict, uuid_t uuid,
+                                            int32_t locked_count,
+                                            char *type)
+{
+        char           name_buf[PATH_MAX]    = "";
+        char          *name                  = NULL;
+        int32_t        i                     = -1;
+        int32_t        op_ret                = 0;
+        int32_t        ret                   = -1;
+        xlator_t      *this                  = NULL;
+
+        this = THIS;
+        GF_ASSERT(this);
+        GF_ASSERT (dict);
+        GF_ASSERT (type);
+
+        if (locked_count == 0) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "No %s locked as part of this transaction",
+                        type);
+                goto out;
+        }
+
+        /* Release all the locks held */
+        for (i = 0; i < locked_count; i++) {
+                snprintf (name_buf, sizeof(name_buf),
+                          "%sname%d", type, i+1);
+
+                /* Looking for volname1, volname2 or snapname1, *
+                 * as key in the dict snapname2 */
+                ret = dict_get_str (dict, name_buf, &name);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Unable to get %s locked_count = %d",
+                                name_buf, locked_count);
+                        op_ret = ret;
+                        continue;
+                }
+
+                ret = glusterd_mgmt_v3_unlock (name, uuid, type);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Failed to release lock for %s.",
+                                name);
+                        op_ret = ret;
+               }
+        }
+
+out:
+        gf_log (this->name, GF_LOG_TRACE, "Returning %d", op_ret);
+        return op_ret;
+}
+
+/* Given the count and type of the entity this function acquires     *
+ * locks on multiple elements of the same entity. For example:       *
+ * If type is "vol" this function tries to acquire locks on multiple *
+ * volumes */
+static int32_t
+glusterd_acquire_multiple_locks_per_entity (dict_t *dict, uuid_t uuid,
+                                            int32_t count, char *type)
+{
+        char           name_buf[PATH_MAX]    = "";
+        char          *name                  = NULL;
+        int32_t        i                     = -1;
+        int32_t        ret                   = -1;
+        int32_t        locked_count          = 0;
+        xlator_t      *this                  = NULL;
+
+        this = THIS;
+        GF_ASSERT(this);
+        GF_ASSERT (dict);
+        GF_ASSERT (type);
+
+        /* Locking one element after other */
+        for (i = 0; i < count; i++) {
+                snprintf (name_buf, sizeof(name_buf),
+                          "%sname%d", type, i+1);
+
+                /* Looking for volname1, volname2 or snapname1, *
+                 * as key in the dict snapname2 */
+                ret = dict_get_str (dict, name_buf, &name);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Unable to get %s count = %d",
+                                name_buf, count);
+                        break;
+                }
+
+                ret = glusterd_mgmt_v3_lock (name, uuid, type);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Failed to acquire lock for %s %s "
+                                "on behalf of %s. Reversing "
+                                "this transaction", type, name,
+                                uuid_utoa(uuid));
+                        break;
+                }
+                locked_count++;
+        }
+
+        if (count == locked_count) {
+                /* If all locking ops went successfuly, return as success */
+                ret = 0;
+                goto out;
+        }
+
+        /* If we failed to lock one element, unlock others and return failure */
+        ret = glusterd_release_multiple_locks_per_entity (dict, uuid,
+                                                          locked_count,
+                                                          type);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Failed to release multiple %s locks",
+                        type);
+        }
+        ret = -1;
+out:
+        gf_log (this->name, GF_LOG_TRACE, "Returning %d", ret);
+        return ret;
+}
+
+/* Given the type of entity, this function figures out if it should unlock a   *
+ * single element of multiple elements of the said entity. For example:        *
+ * if the type is "vol", this function will accordingly unlock a single volume *
+ * or multiple volumes */
+static int32_t
+glusterd_mgmt_v3_unlock_entity (dict_t *dict, uuid_t uuid, char *type,
+                                gf_boolean_t default_value)
+{
+        char           name_buf[PATH_MAX]    = "";
+        char          *name                  = NULL;
+        int32_t        count                 = -1;
+        int32_t        ret                   = -1;
+        gf_boolean_t   hold_locks            = _gf_false;
+        xlator_t      *this                  = NULL;
+
+        this = THIS;
+        GF_ASSERT(this);
+        GF_ASSERT (dict);
+        GF_ASSERT (type);
+
+        snprintf (name_buf, sizeof(name_buf), "hold_%s_locks", type);
+        hold_locks = dict_get_str_boolean (dict, name_buf, default_value);
+
+        if (hold_locks == _gf_false) {
+                /* Locks were not held for this particular entity *
+                 * Hence nothing to release */
+                ret = 0;
+                goto out;
+        }
+
+        /* Looking for volcount or snapcount in the dict */
+        snprintf (name_buf, sizeof(name_buf), "%scount", type);
+        ret = dict_get_int32 (dict, name_buf, &count);
+        if (ret) {
+                /* count is not present. Only one *
+                 * element name needs to be unlocked */
+                snprintf (name_buf, sizeof(name_buf), "%sname",
+                          type);
+                ret = dict_get_str (dict, name_buf, &name);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Unable to fetch %sname", type);
+                        goto out;
+                }
+
+                ret = glusterd_mgmt_v3_unlock (name, uuid, type);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Failed to release lock for %s %s "
+                                "on behalf of %s.", type, name,
+                                uuid_utoa(uuid));
+                        goto out;
+                }
+        } else {
+                /* Unlocking one element name after another */
+                ret = glusterd_release_multiple_locks_per_entity (dict,
+                                                                  uuid,
+                                                                  count,
+                                                                  type);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Failed to release all %s locks", type);
+                        goto out;
+                }
+        }
+
+        ret = 0;
+out:
+        gf_log (this->name, GF_LOG_TRACE, "Returning %d", ret);
+        return ret;
+}
+
+/* Given the type of entity, this function figures out if it should lock a   *
+ * single element or multiple elements of the said entity. For example:      *
+ * if the type is "vol", this function will accordingly lock a single volume *
+ * or multiple volumes */
+static int32_t
+glusterd_mgmt_v3_lock_entity (dict_t *dict, uuid_t uuid, char *type,
+                              gf_boolean_t default_value)
+{
+        char           name_buf[PATH_MAX]    = "";
+        char          *name                  = NULL;
+        int32_t        count                 = -1;
+        int32_t        ret                   = -1;
+        gf_boolean_t   hold_locks            = _gf_false;
+        xlator_t      *this                  = NULL;
+
+        this = THIS;
+        GF_ASSERT(this);
+        GF_ASSERT (dict);
+        GF_ASSERT (type);
+
+        snprintf (name_buf, sizeof(name_buf), "hold_%s_locks", type);
+        hold_locks = dict_get_str_boolean (dict, name_buf, default_value);
+
+        if (hold_locks == _gf_false) {
+                /* Not holding locks for this particular entity */
+                ret = 0;
+                goto out;
+        }
+
+        /* Looking for volcount or snapcount in the dict */
+        snprintf (name_buf, sizeof(name_buf), "%scount", type);
+        ret = dict_get_int32 (dict, name_buf, &count);
+        if (ret) {
+                /* count is not present. Only one *
+                 * element name needs to be locked */
+                snprintf (name_buf, sizeof(name_buf), "%sname",
+                          type);
+                ret = dict_get_str (dict, name_buf, &name);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Unable to fetch %sname", type);
+                        goto out;
+                }
+
+                ret = glusterd_mgmt_v3_lock (name, uuid, type);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Failed to acquire lock for %s %s "
+                                "on behalf of %s.", type, name,
+                                uuid_utoa(uuid));
+                        goto out;
+                }
+        } else {
+                /* Locking one element name after another */
+                ret = glusterd_acquire_multiple_locks_per_entity (dict,
+                                                                  uuid,
+                                                                  count,
+                                                                  type);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Failed to acquire all %s locks", type);
+                        goto out;
+                }
+        }
+
+        ret = 0;
+out:
+        gf_log (this->name, GF_LOG_TRACE, "Returning %d", ret);
+        return ret;
+}
+
+/* Try to release locks of multiple entities like *
+ * volume, snaps etc. */
+int32_t
+glusterd_multiple_mgmt_v3_unlock (dict_t *dict, uuid_t uuid)
+{
+        int32_t        i                     = -1;
+        int32_t        ret                   = -1;
+        int32_t        op_ret                = 0;
+        xlator_t      *this                  = NULL;
+
+        this = THIS;
+        GF_ASSERT(this);
+
+        if (!dict) {
+                gf_log (this->name, GF_LOG_ERROR, "dict is null.");
+                ret = -1;
+                goto out;
+        }
+
+        for (i = 0; valid_types[i].type; i++) {
+                ret = glusterd_mgmt_v3_unlock_entity
+                                            (dict, uuid,
+                                             valid_types[i].type,
+                                             valid_types[i].default_value);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Unable to unlock all %s",
+                                valid_types[i].type);
+                        op_ret = ret;
+                }
+        }
+
+        ret = op_ret;
+out:
+        gf_log (this->name, GF_LOG_DEBUG, "Returning %d", ret);
+        return ret;
+}
+
+/* Try to acquire locks on multiple entities like *
+ * volume, snaps etc. */
+int32_t
+glusterd_multiple_mgmt_v3_lock (dict_t *dict, uuid_t uuid)
+{
+        int32_t        i                     = -1;
+        int32_t        ret                   = -1;
+        int32_t        locked_count          = 0;
+        xlator_t      *this                  = NULL;
+
+        this = THIS;
+        GF_ASSERT(this);
+
+        if (!dict) {
+                gf_log (this->name, GF_LOG_ERROR, "dict is null.");
+                ret = -1;
+                goto out;
+        }
+
+        /* Locking one entity after other */
+        for (i = 0; valid_types[i].type; i++) {
+                ret = glusterd_mgmt_v3_lock_entity
+                                            (dict, uuid,
+                                             valid_types[i].type,
+                                             valid_types[i].default_value);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Unable to lock all %s",
+                                valid_types[i].type);
+                        break;
+                }
+                locked_count++;
+        }
+
+        if (locked_count == GF_MAX_LOCKING_ENTITIES) {
+                /* If all locking ops went successfuly, return as success */
+                ret = 0;
+                goto out;
+        }
+
+        /* If we failed to lock one entity, unlock others and return failure */
+        for (i = 0; i < locked_count; i++) {
+                ret = glusterd_mgmt_v3_unlock_entity
+                                              (dict, uuid,
+                                               valid_types[i].type,
+                                               valid_types[i].default_value);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Unable to unlock all %s",
+                                valid_types[i].type);
+                }
+        }
+        ret = -1;
+out:
+        gf_log (this->name, GF_LOG_DEBUG, "Returning %d", ret);
+        return ret;
+}
+
+int32_t
+glusterd_mgmt_v3_lock (const char *name, uuid_t uuid, char *type)
+{
+        char                 key[PATH_MAX] = "";
+        int32_t              ret           = -1;
+        mgmt_v3_lock_obj    *lock_obj      = NULL;
+        gf_boolean_t         is_valid      = _gf_true;
+        uuid_t               owner         = {0};
+        xlator_t            *this          = NULL;
+
+        GF_ASSERT(THIS);
+        this = THIS;
+
+        if (!name || !type) {
+                gf_log (this->name, GF_LOG_ERROR, "name or type is null.");
+                ret = -1;
+                goto out;
+        }
+
+        is_valid = glusterd_mgmt_v3_is_type_valid (type);
+        if (is_valid != _gf_true) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Invalid entity. Cannot perform locking "
+                        "operation on %s types", type);
+                ret = -1;
+                goto out;
+        }
+
+        ret = snprintf (key, sizeof(key), "%s_%s", name, type);
+        if (ret != strlen(name) + 1 + strlen(type)) {
+                ret = -1;
+                gf_log (this->name, GF_LOG_ERROR, "Unable to create key");
+                goto out;
+        }
+
+        gf_log (this->name, GF_LOG_DEBUG,
+                "Trying to acquire lock of %s %s for %s as %s",
+                type, name, uuid_utoa (uuid), key);
+
+        ret = glusterd_get_mgmt_v3_lock_owner (key, &owner);
+        if (ret) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "Unable to get mgmt_v3 lock owner");
+                goto out;
+        }
+
+        /* If the lock has already been held for the given volume
+         * we fail */
+        if (!uuid_is_null (owner)) {
+                gf_log (this->name, GF_LOG_ERROR, "Lock for %s held by %s",
+                        name, uuid_utoa (owner));
+                ret = -1;
+                goto out;
+        }
+
+        lock_obj = GF_CALLOC (1, sizeof(mgmt_v3_lock_obj),
+                              gf_common_mt_mgmt_v3_lock_obj_t);
+        if (!lock_obj) {
+                ret = -1;
+                goto out;
+        }
+
+        uuid_copy (lock_obj->lock_owner, uuid);
+
+        ret = dict_set_bin (mgmt_v3_lock, key, lock_obj,
+                            sizeof(*lock_obj));
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Unable to set lock owner in mgmt_v3 lock");
+                if (lock_obj)
+                        GF_FREE (lock_obj);
+                goto out;
+        }
+
+        gf_log (this->name, GF_LOG_DEBUG,
+                "Lock for %s %s successfully held by %s",
+                type, name, uuid_utoa (uuid));
+
+        ret = 0;
+out:
+        gf_log (this->name, GF_LOG_TRACE, "Returning %d", ret);
+        return ret;
+}
+
+int32_t
+glusterd_mgmt_v3_unlock (const char *name, uuid_t uuid, char *type)
+{
+        char           key[PATH_MAX] = "";
+        int32_t        ret           = -1;
+        gf_boolean_t   is_valid      = _gf_true;
+        uuid_t         owner         = {0};
+        xlator_t            *this          = NULL;
+
+        GF_ASSERT(THIS);
+        this = THIS;
+
+        if (!name || !type) {
+                gf_log (this->name, GF_LOG_ERROR, "name is null.");
+                ret = -1;
+                goto out;
+        }
+
+        is_valid = glusterd_mgmt_v3_is_type_valid (type);
+        if (is_valid != _gf_true) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Invalid entity. Cannot perform unlocking "
+                        "operation on %s types", type);
+                ret = -1;
+                goto out;
+        }
+
+        ret = snprintf (key, sizeof(key), "%s_%s",
+                        name, type);
+        if (ret != strlen(name) + 1 + strlen(type)) {
+                gf_log (this->name, GF_LOG_ERROR, "Unable to create key");
+                ret = -1;
+                goto out;
+        }
+
+        gf_log (this->name, GF_LOG_DEBUG,
+                "Trying to release lock of %s %s for %s as %s",
+                type, name, uuid_utoa (uuid), key);
+
+        ret = glusterd_get_mgmt_v3_lock_owner (key, &owner);
+        if (ret) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "Unable to get mgmt_v3 lock owner");
+                goto out;
+        }
+
+        if (uuid_is_null (owner)) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Lock for %s %s not held", type, name);
+                ret = -1;
+                goto out;
+        }
+
+        ret = uuid_compare (uuid, owner);
+        if (ret) {
+
+                gf_log (this->name, GF_LOG_ERROR, "Lock owner mismatch. "
+                        "Lock for %s %s held by %s",
+                        type, name, uuid_utoa (owner));
+                goto out;
+        }
+
+        /* Removing the mgmt_v3 lock from the global list */
+        dict_del (mgmt_v3_lock, key);
+
+        gf_log (this->name, GF_LOG_DEBUG,
+                "Lock for %s %s successfully released",
+                type, name);
+
+        ret = 0;
+out:
+        gf_log (this->name, GF_LOG_TRACE, "Returning %d", ret);
+        return ret;
+}
diff --git a/xlators/mgmt/glusterd/src/glusterd-locks.h b/xlators/mgmt/glusterd/src/glusterd-locks.h
new file mode 100644
index 000000000..83eb8c997
--- /dev/null
+++ b/xlators/mgmt/glusterd/src/glusterd-locks.h
@@ -0,0 +1,51 @@
+/*
+   Copyright (c) 2013-2014 Red Hat, Inc. <http://www.redhat.com>
+   This file is part of GlusterFS.
+
+   This file is licensed to you under your choice of the GNU Lesser
+   General Public License, version 3 or any later version (LGPLv3 or
+   later), or the GNU General Public License, version 2 (GPLv2), in all
+   cases as published by the Free Software Foundation.
+*/
+#ifndef _GLUSTERD_LOCKS_H_
+#define _GLUSTERD_LOCKS_H_
+
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+
+typedef struct mgmt_v3_lock_object_ {
+        uuid_t              lock_owner;
+} mgmt_v3_lock_obj;
+
+typedef struct mgmt_v3_lock_valid_entities {
+        char          *type;          /* Entity type like vol, snap */
+        gf_boolean_t   default_value; /* The default value that  *
+                                       * determines if the locks *
+                                       * should be held for that *
+                                       * entity */
+} valid_entities;
+
+int32_t
+glusterd_mgmt_v3_lock_init ();
+
+void
+glusterd_mgmt_v3_lock_fini ();
+
+int32_t
+glusterd_get_mgmt_v3_lock_owner (char *volname, uuid_t *uuid);
+
+int32_t
+glusterd_mgmt_v3_lock (const char *key, uuid_t uuid, char *type);
+
+int32_t
+glusterd_mgmt_v3_unlock (const char *key, uuid_t uuid, char *type);
+
+int32_t
+glusterd_multiple_mgmt_v3_lock (dict_t *dict, uuid_t uuid);
+
+int32_t
+glusterd_multiple_mgmt_v3_unlock (dict_t *dict, uuid_t uuid);
+
+#endif
diff --git a/xlators/mgmt/glusterd/src/glusterd-log-ops.c b/xlators/mgmt/glusterd/src/glusterd-log-ops.c
index bd07af5b0..33bd95c03 100644
--- a/xlators/mgmt/glusterd/src/glusterd-log-ops.c
+++ b/xlators/mgmt/glusterd/src/glusterd-log-ops.c
@@ -24,7 +24,7 @@
 #include <signal.h>
 
 int
-glusterd_handle_log_rotate (rpcsvc_request_t *req)
+__glusterd_handle_log_rotate (rpcsvc_request_t *req)
 {
         int32_t                 ret     = -1;
         gf_cli_req              cli_req = {{0,}};
@@ -90,6 +90,13 @@ out:
         return ret;
 }
 
+int
+glusterd_handle_log_rotate (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req,
+                                            __glusterd_handle_log_rotate);
+}
+
 /* op-sm */
 int
 glusterd_op_stage_log_rotate (dict_t *dict, char **op_errstr)
@@ -160,7 +167,6 @@ glusterd_op_log_rotate (dict_t *dict)
         xlator_t             *this               = NULL;
         char                 *volname            = NULL;
         char                 *brick              = NULL;
-        char                  path[PATH_MAX]     = {0,};
         char                  logfile[PATH_MAX]  = {0,};
         char                  pidfile[PATH_MAX]  = {0,};
         FILE                 *file               = NULL;
@@ -216,10 +222,7 @@ cont:
 
                 valid_brick = 1;
 
-                GLUSTERD_GET_VOLUME_DIR (path, volinfo, priv);
-                GLUSTERD_GET_BRICK_PIDFILE (pidfile, path, brickinfo->hostname,
-                                            brickinfo->path);
-
+                GLUSTERD_GET_BRICK_PIDFILE (pidfile, volinfo, brickinfo, priv);
                 file = fopen (pidfile, "r+");
                 if (!file) {
                         gf_log ("", GF_LOG_ERROR, "Unable to open pidfile: %s",
diff --git a/xlators/mgmt/glusterd/src/glusterd-mem-types.h b/xlators/mgmt/glusterd/src/glusterd-mem-types.h
index 98216e28a..e6f6a0333 100644
--- a/xlators/mgmt/glusterd/src/glusterd-mem-types.h
+++ b/xlators/mgmt/glusterd/src/glusterd-mem-types.h
@@ -66,7 +66,10 @@ typedef enum gf_gld_mem_types_ {
         gf_gld_mt_hooks_stub_t                  = gf_common_mt_end + 50,
         gf_gld_mt_hooks_priv_t                  = gf_common_mt_end + 51,
         gf_gld_mt_mop_commit_req_t              = gf_common_mt_end + 52,
-        gf_gld_mt_end                           = gf_common_mt_end + 53,
+        gf_gld_mt_int                           = gf_common_mt_end + 53,
+        gf_gld_mt_snap_t                        = gf_common_mt_end + 54,
+        gf_gld_mt_missed_snapinfo_t             = gf_common_mt_end + 55,
+        gf_gld_mt_end                           = gf_common_mt_end + 56,
 } gf_gld_mem_types_t;
 #endif
 
diff --git a/xlators/mgmt/glusterd/src/glusterd-mgmt-handler.c b/xlators/mgmt/glusterd/src/glusterd-mgmt-handler.c
new file mode 100644
index 000000000..a5f38ce9c
--- /dev/null
+++ b/xlators/mgmt/glusterd/src/glusterd-mgmt-handler.c
@@ -0,0 +1,924 @@
+/*
+   Copyright (c) 2013-2014 Red Hat, Inc. <http://www.redhat.com>
+   This file is part of GlusterFS.
+
+   This file is licensed to you under your choice of the GNU Lesser
+   General Public License, version 3 or any later version (LGPLv3 or
+   later), or the GNU General Public License, version 2 (GPLv2), in all
+   cases as published by the Free Software Foundation.
+*/
+/* rpc related syncops */
+#include "rpc-clnt.h"
+#include "protocol-common.h"
+#include "xdr-generic.h"
+#include "glusterd1-xdr.h"
+#include "glusterd-syncop.h"
+
+#include "glusterd.h"
+#include "glusterd-utils.h"
+#include "glusterd-locks.h"
+#include "glusterd-mgmt.h"
+#include "glusterd-op-sm.h"
+
+static int
+glusterd_mgmt_v3_null (rpcsvc_request_t *req)
+{
+        return 0;
+}
+
+static int
+glusterd_mgmt_v3_lock_send_resp (rpcsvc_request_t *req, int32_t status)
+{
+
+        gd1_mgmt_v3_lock_rsp          rsp   = {{0},};
+        int                           ret   = -1;
+        xlator_t                     *this  = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (req);
+
+        rsp.op_ret = status;
+        if (rsp.op_ret)
+               rsp.op_errno = errno;
+
+        glusterd_get_uuid (&rsp.uuid);
+
+        ret = glusterd_submit_reply (req, &rsp, NULL, 0, NULL,
+                                     (xdrproc_t)xdr_gd1_mgmt_v3_lock_rsp);
+
+        gf_log (this->name, GF_LOG_DEBUG,
+                "Responded to mgmt_v3 lock, ret: %d", ret);
+
+        return ret;
+}
+
+static int
+glusterd_synctasked_mgmt_v3_lock (rpcsvc_request_t *req,
+                                  gd1_mgmt_v3_lock_req *lock_req,
+                                  glusterd_op_lock_ctx_t *ctx)
+{
+        int32_t                         ret         = -1;
+        xlator_t                       *this        = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (req);
+        GF_ASSERT (ctx);
+        GF_ASSERT (ctx->dict);
+
+        /* Trying to acquire multiple mgmt_v3 locks */
+        ret = glusterd_multiple_mgmt_v3_lock (ctx->dict, ctx->uuid);
+        if (ret)
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Failed to acquire mgmt_v3 locks for %s",
+                         uuid_utoa (ctx->uuid));
+
+        ret = glusterd_mgmt_v3_lock_send_resp (req, ret);
+
+        gf_log (this->name, GF_LOG_TRACE, "Returning %d", ret);
+        return ret;
+}
+
+static int
+glusterd_op_state_machine_mgmt_v3_lock (rpcsvc_request_t *req,
+                                        gd1_mgmt_v3_lock_req *lock_req,
+                                        glusterd_op_lock_ctx_t *ctx)
+{
+        int32_t                         ret         = -1;
+        xlator_t                       *this        = NULL;
+        glusterd_op_info_t              txn_op_info = {{0},};
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (req);
+
+        glusterd_txn_opinfo_init (&txn_op_info, NULL, &lock_req->op,
+                                  ctx->dict, req);
+
+        ret = glusterd_set_txn_opinfo (&lock_req->txn_id, &txn_op_info);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Unable to set transaction's opinfo");
+                goto out;
+        }
+
+        ret = glusterd_op_sm_inject_event (GD_OP_EVENT_LOCK,
+                                           &lock_req->txn_id, ctx);
+        if (ret)
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Failed to inject event GD_OP_EVENT_LOCK");
+
+out:
+        glusterd_friend_sm ();
+        glusterd_op_sm ();
+
+        gf_log (this->name, GF_LOG_TRACE, "Returning %d", ret);
+        return ret;
+}
+
+static int
+glusterd_handle_mgmt_v3_lock_fn (rpcsvc_request_t *req)
+{
+        gd1_mgmt_v3_lock_req            lock_req    = {{0},};
+        int32_t                         ret         = -1;
+        glusterd_peerinfo_t            *peerinfo    = NULL;
+        glusterd_op_lock_ctx_t         *ctx         = NULL;
+        xlator_t                       *this        = NULL;
+        gf_boolean_t                    is_synctasked = _gf_false;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (req);
+
+        ret = xdr_to_generic (req->msg[0], &lock_req,
+                              (xdrproc_t)xdr_gd1_mgmt_v3_lock_req);
+        if (ret < 0) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to decode lock "
+                        "request received from peer");
+                req->rpc_err = GARBAGE_ARGS;
+                goto out;
+        }
+
+        gf_log (this->name, GF_LOG_DEBUG, "Received mgmt_v3 lock req "
+                "from uuid: %s", uuid_utoa (lock_req.uuid));
+
+        if (glusterd_friend_find_by_uuid (lock_req.uuid, &peerinfo)) {
+                gf_log (this->name, GF_LOG_WARNING, "%s doesn't "
+                        "belong to the cluster. Ignoring request.",
+                        uuid_utoa (lock_req.uuid));
+                ret = -1;
+                goto out;
+        }
+
+        ctx = GF_CALLOC (1, sizeof (*ctx), gf_gld_mt_op_lock_ctx_t);
+        if (!ctx) {
+                ret = -1;
+                goto out;
+        }
+
+        uuid_copy (ctx->uuid, lock_req.uuid);
+        ctx->req = req;
+
+        ctx->dict = dict_new ();
+        if (!ctx->dict) {
+                ret = -1;
+                goto out;
+        }
+
+        ret = dict_unserialize (lock_req.dict.dict_val,
+                                lock_req.dict.dict_len, &ctx->dict);
+        if (ret) {
+                gf_log (this->name, GF_LOG_WARNING,
+                        "failed to unserialize the dictionary");
+                goto out;
+        }
+
+        is_synctasked = dict_get_str_boolean (ctx->dict,
+                                              "is_synctasked", _gf_false);
+        if (is_synctasked)
+                ret = glusterd_synctasked_mgmt_v3_lock (req, &lock_req, ctx);
+        else
+                ret = glusterd_op_state_machine_mgmt_v3_lock (req, &lock_req,
+                                                              ctx);
+
+out:
+
+        if (ret) {
+                if (ctx->dict)
+                        dict_unref (ctx->dict);
+                if (ctx)
+                        GF_FREE (ctx);
+        }
+
+        free (lock_req.dict.dict_val);
+
+        gf_log (this->name, GF_LOG_TRACE, "Returning %d", ret);
+        return ret;
+}
+
+static int
+glusterd_mgmt_v3_pre_validate_send_resp (rpcsvc_request_t   *req,
+                                        int32_t op, int32_t status,
+                                        char *op_errstr, dict_t *rsp_dict)
+{
+        gd1_mgmt_v3_pre_val_rsp          rsp      = {{0},};
+        int                             ret      = -1;
+        xlator_t                       *this     = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (req);
+
+        rsp.op_ret = status;
+        glusterd_get_uuid (&rsp.uuid);
+        rsp.op = op;
+        if (op_errstr)
+                rsp.op_errstr = op_errstr;
+        else
+                rsp.op_errstr = "";
+
+        ret = dict_allocate_and_serialize (rsp_dict, &rsp.dict.dict_val,
+                                           &rsp.dict.dict_len);
+        if (ret < 0) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "failed to get serialized length of dict");
+                goto out;
+        }
+
+        ret = glusterd_submit_reply (req, &rsp, NULL, 0, NULL,
+                                     (xdrproc_t)xdr_gd1_mgmt_v3_pre_val_rsp);
+
+        GF_FREE (rsp.dict.dict_val);
+out:
+        gf_log (this->name, GF_LOG_DEBUG,
+                "Responded to pre validation, ret: %d", ret);
+        return ret;
+}
+
+static int
+glusterd_handle_pre_validate_fn (rpcsvc_request_t *req)
+{
+        int32_t                         ret       = -1;
+        gd1_mgmt_v3_pre_val_req          op_req    = {{0},};
+        glusterd_peerinfo_t            *peerinfo  = NULL;
+        xlator_t                       *this      = NULL;
+        char                           *op_errstr = NULL;
+        dict_t                         *dict      = NULL;
+        dict_t                         *rsp_dict  = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (req);
+
+        ret = xdr_to_generic (req->msg[0], &op_req,
+                              (xdrproc_t)xdr_gd1_mgmt_v3_pre_val_req);
+        if (ret < 0) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Failed to decode pre validation "
+                        "request received from peer");
+                req->rpc_err = GARBAGE_ARGS;
+                goto out;
+        }
+
+        if (glusterd_friend_find_by_uuid (op_req.uuid, &peerinfo)) {
+                gf_log (this->name, GF_LOG_WARNING, "%s doesn't "
+                        "belong to the cluster. Ignoring request.",
+                        uuid_utoa (op_req.uuid));
+                ret = -1;
+                goto out;
+        }
+
+        dict = dict_new ();
+        if (!dict)
+                goto out;
+
+        ret = dict_unserialize (op_req.dict.dict_val,
+                                op_req.dict.dict_len, &dict);
+        if (ret) {
+                gf_log (this->name, GF_LOG_WARNING,
+                        "failed to unserialize the dictionary");
+                goto out;
+        }
+
+        rsp_dict = dict_new ();
+        if (!rsp_dict) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Failed to get new dictionary");
+                return -1;
+        }
+
+        ret = gd_mgmt_v3_pre_validate_fn (op_req.op, dict, &op_errstr,
+                                         rsp_dict);
+
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Pre Validation failed on operation %s",
+                        gd_op_list[op_req.op]);
+        }
+
+        ret = glusterd_mgmt_v3_pre_validate_send_resp (req, op_req.op,
+                                                      ret, op_errstr,
+                                                      rsp_dict);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Failed to send Pre Validation "
+                        "response for operation %s",
+                        gd_op_list[op_req.op]);
+                goto out;
+        }
+
+out:
+        if (op_errstr && (strcmp (op_errstr, "")))
+                GF_FREE (op_errstr);
+
+        free (op_req.dict.dict_val);
+
+        if (dict)
+                dict_unref (dict);
+
+        if (rsp_dict)
+                dict_unref (rsp_dict);
+
+        gf_log (this->name, GF_LOG_TRACE, "Returning %d", ret);
+        return ret;
+}
+
+static int
+glusterd_mgmt_v3_brick_op_send_resp (rpcsvc_request_t   *req,
+                                    int32_t op, int32_t status,
+                                    char *op_errstr, dict_t *rsp_dict)
+{
+        gd1_mgmt_v3_brick_op_rsp         rsp      = {{0},};
+        int                             ret      = -1;
+        xlator_t                       *this     = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (req);
+
+        rsp.op_ret = status;
+        glusterd_get_uuid (&rsp.uuid);
+        rsp.op = op;
+        if (op_errstr)
+                rsp.op_errstr = op_errstr;
+        else
+                rsp.op_errstr = "";
+
+        ret = dict_allocate_and_serialize (rsp_dict, &rsp.dict.dict_val,
+                                           &rsp.dict.dict_len);
+        if (ret < 0) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "failed to get serialized length of dict");
+                goto out;
+        }
+
+        ret = glusterd_submit_reply (req, &rsp, NULL, 0, NULL,
+                                     (xdrproc_t)xdr_gd1_mgmt_v3_brick_op_rsp);
+
+        GF_FREE (rsp.dict.dict_val);
+out:
+        gf_log (this->name, GF_LOG_DEBUG,
+                "Responded to brick op, ret: %d", ret);
+        return ret;
+}
+
+static int
+glusterd_handle_brick_op_fn (rpcsvc_request_t *req)
+{
+        int32_t                         ret       = -1;
+        gd1_mgmt_v3_brick_op_req         op_req    = {{0},};
+        glusterd_peerinfo_t            *peerinfo  = NULL;
+        xlator_t                       *this      = NULL;
+        char                           *op_errstr = NULL;
+        dict_t                         *dict      = NULL;
+        dict_t                         *rsp_dict  = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (req);
+
+        ret = xdr_to_generic (req->msg[0], &op_req,
+                              (xdrproc_t)xdr_gd1_mgmt_v3_brick_op_req);
+        if (ret < 0) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to decode brick op "
+                        "request received from peer");
+                req->rpc_err = GARBAGE_ARGS;
+                goto out;
+        }
+
+        if (glusterd_friend_find_by_uuid (op_req.uuid, &peerinfo)) {
+                gf_log (this->name, GF_LOG_WARNING, "%s doesn't "
+                        "belong to the cluster. Ignoring request.",
+                        uuid_utoa (op_req.uuid));
+                ret = -1;
+                goto out;
+        }
+
+        dict = dict_new ();
+        if (!dict)
+                goto out;
+
+        ret = dict_unserialize (op_req.dict.dict_val,
+                                op_req.dict.dict_len, &dict);
+        if (ret) {
+                gf_log (this->name, GF_LOG_WARNING,
+                        "failed to unserialize the dictionary");
+                goto out;
+        }
+
+        rsp_dict = dict_new ();
+        if (!rsp_dict) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Failed to get new dictionary");
+                return -1;
+        }
+
+        ret = gd_mgmt_v3_brick_op_fn (op_req.op, dict, &op_errstr,
+                                     rsp_dict);
+
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Brick Op failed on operation %s",
+                        gd_op_list[op_req.op]);
+        }
+
+        ret = glusterd_mgmt_v3_brick_op_send_resp (req, op_req.op,
+                                                  ret, op_errstr,
+                                                  rsp_dict);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Failed to send brick op "
+                        "response for operation %s",
+                        gd_op_list[op_req.op]);
+                goto out;
+        }
+
+out:
+        if (op_errstr && (strcmp (op_errstr, "")))
+                GF_FREE (op_errstr);
+
+        free (op_req.dict.dict_val);
+
+        if (dict)
+                dict_unref (dict);
+
+        if (rsp_dict)
+                dict_unref (rsp_dict);
+
+        gf_log (this->name, GF_LOG_TRACE, "Returning %d", ret);
+        return ret;
+}
+
+static int
+glusterd_mgmt_v3_commit_send_resp (rpcsvc_request_t   *req,
+                                  int32_t op, int32_t status,
+                                  char *op_errstr, dict_t *rsp_dict)
+{
+        gd1_mgmt_v3_commit_rsp           rsp      = {{0},};
+        int                             ret      = -1;
+        xlator_t                       *this     = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (req);
+
+        rsp.op_ret = status;
+        glusterd_get_uuid (&rsp.uuid);
+        rsp.op = op;
+        if (op_errstr)
+                rsp.op_errstr = op_errstr;
+        else
+                rsp.op_errstr = "";
+
+        ret = dict_allocate_and_serialize (rsp_dict, &rsp.dict.dict_val,
+                                           &rsp.dict.dict_len);
+        if (ret < 0) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "failed to get serialized length of dict");
+                goto out;
+        }
+
+        ret = glusterd_submit_reply (req, &rsp, NULL, 0, NULL,
+                                     (xdrproc_t)xdr_gd1_mgmt_v3_commit_rsp);
+
+        GF_FREE (rsp.dict.dict_val);
+out:
+        gf_log (this->name, GF_LOG_DEBUG, "Responded to commit, ret: %d", ret);
+        return ret;
+}
+
+static int
+glusterd_handle_commit_fn (rpcsvc_request_t *req)
+{
+        int32_t                         ret       = -1;
+        gd1_mgmt_v3_commit_req           op_req    = {{0},};
+        glusterd_peerinfo_t            *peerinfo  = NULL;
+        xlator_t                       *this      = NULL;
+        char                           *op_errstr = NULL;
+        dict_t                         *dict      = NULL;
+        dict_t                         *rsp_dict  = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (req);
+
+        ret = xdr_to_generic (req->msg[0], &op_req,
+                              (xdrproc_t)xdr_gd1_mgmt_v3_commit_req);
+        if (ret < 0) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to decode commit "
+                        "request received from peer");
+                req->rpc_err = GARBAGE_ARGS;
+                goto out;
+        }
+
+        if (glusterd_friend_find_by_uuid (op_req.uuid, &peerinfo)) {
+                gf_log (this->name, GF_LOG_WARNING, "%s doesn't "
+                        "belong to the cluster. Ignoring request.",
+                        uuid_utoa (op_req.uuid));
+                ret = -1;
+                goto out;
+        }
+
+        dict = dict_new ();
+        if (!dict)
+                goto out;
+
+        ret = dict_unserialize (op_req.dict.dict_val,
+                                op_req.dict.dict_len, &dict);
+        if (ret) {
+                gf_log (this->name, GF_LOG_WARNING,
+                        "failed to unserialize the dictionary");
+                goto out;
+        }
+
+        rsp_dict = dict_new ();
+        if (!rsp_dict) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Failed to get new dictionary");
+                return -1;
+        }
+
+        ret = gd_mgmt_v3_commit_fn (op_req.op, dict, &op_errstr,
+                                   rsp_dict);
+
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "commit failed on operation %s",
+                        gd_op_list[op_req.op]);
+        }
+
+        ret = glusterd_mgmt_v3_commit_send_resp (req, op_req.op,
+                                                ret, op_errstr,
+                                                rsp_dict);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Failed to send commit "
+                        "response for operation %s",
+                        gd_op_list[op_req.op]);
+                goto out;
+        }
+
+out:
+        if (op_errstr && (strcmp (op_errstr, "")))
+                GF_FREE (op_errstr);
+
+        free (op_req.dict.dict_val);
+
+        if (dict)
+                dict_unref (dict);
+
+        if (rsp_dict)
+                dict_unref (rsp_dict);
+
+        gf_log (this->name, GF_LOG_TRACE, "Returning %d", ret);
+        return ret;
+}
+
+static int
+glusterd_mgmt_v3_post_validate_send_resp (rpcsvc_request_t   *req,
+                                         int32_t op, int32_t status,
+                                         char *op_errstr, dict_t *rsp_dict)
+{
+        gd1_mgmt_v3_post_val_rsp         rsp      = {{0},};
+        int                             ret      = -1;
+        xlator_t                       *this     = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (req);
+
+        rsp.op_ret = status;
+        glusterd_get_uuid (&rsp.uuid);
+        rsp.op = op;
+        if (op_errstr)
+                rsp.op_errstr = op_errstr;
+        else
+                rsp.op_errstr = "";
+
+        ret = dict_allocate_and_serialize (rsp_dict, &rsp.dict.dict_val,
+                                           &rsp.dict.dict_len);
+        if (ret < 0) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "failed to get serialized length of dict");
+                goto out;
+        }
+
+        ret = glusterd_submit_reply (req, &rsp, NULL, 0, NULL,
+                                     (xdrproc_t)xdr_gd1_mgmt_v3_post_val_rsp);
+
+        GF_FREE (rsp.dict.dict_val);
+out:
+        gf_log (this->name, GF_LOG_DEBUG,
+                "Responded to post validation, ret: %d", ret);
+        return ret;
+}
+
+static int
+glusterd_handle_post_validate_fn (rpcsvc_request_t *req)
+{
+        int32_t                         ret       = -1;
+        gd1_mgmt_v3_post_val_req         op_req    = {{0},};
+        glusterd_peerinfo_t            *peerinfo  = NULL;
+        xlator_t                       *this      = NULL;
+        char                           *op_errstr = NULL;
+        dict_t                         *dict      = NULL;
+        dict_t                         *rsp_dict  = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (req);
+
+        ret = xdr_to_generic (req->msg[0], &op_req,
+                              (xdrproc_t)xdr_gd1_mgmt_v3_post_val_req);
+        if (ret < 0) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Failed to decode post validation "
+                        "request received from peer");
+                req->rpc_err = GARBAGE_ARGS;
+                goto out;
+        }
+
+        if (glusterd_friend_find_by_uuid (op_req.uuid, &peerinfo)) {
+                gf_log (this->name, GF_LOG_WARNING, "%s doesn't "
+                        "belong to the cluster. Ignoring request.",
+                        uuid_utoa (op_req.uuid));
+                ret = -1;
+                goto out;
+        }
+
+        dict = dict_new ();
+        if (!dict)
+                goto out;
+
+        ret = dict_unserialize (op_req.dict.dict_val,
+                                op_req.dict.dict_len, &dict);
+        if (ret) {
+                gf_log (this->name, GF_LOG_WARNING,
+                        "failed to unserialize the dictionary");
+                goto out;
+        }
+
+        rsp_dict = dict_new ();
+        if (!rsp_dict) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Failed to get new dictionary");
+                return -1;
+        }
+
+        ret = gd_mgmt_v3_post_validate_fn (op_req.op, op_req.op_ret, dict,
+                                           &op_errstr, rsp_dict);
+
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Post Validation failed on operation %s",
+                        gd_op_list[op_req.op]);
+        }
+
+        ret = glusterd_mgmt_v3_post_validate_send_resp (req, op_req.op,
+                                                       ret, op_errstr,
+                                                       rsp_dict);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Failed to send Post Validation "
+                        "response for operation %s",
+                        gd_op_list[op_req.op]);
+                goto out;
+        }
+
+out:
+        if (op_errstr && (strcmp (op_errstr, "")))
+                GF_FREE (op_errstr);
+
+        free (op_req.dict.dict_val);
+
+        if (dict)
+                dict_unref (dict);
+
+        if (rsp_dict)
+                dict_unref (rsp_dict);
+
+        gf_log (this->name, GF_LOG_TRACE, "Returning %d", ret);
+        return ret;
+}
+
+static int
+glusterd_mgmt_v3_unlock_send_resp (rpcsvc_request_t *req, int32_t status)
+{
+
+        gd1_mgmt_v3_unlock_rsp          rsp   = {{0},};
+        int                             ret   = -1;
+        xlator_t                       *this  = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (req);
+
+        rsp.op_ret = status;
+        if (rsp.op_ret)
+               rsp.op_errno = errno;
+
+        glusterd_get_uuid (&rsp.uuid);
+
+        ret = glusterd_submit_reply (req, &rsp, NULL, 0, NULL,
+                                     (xdrproc_t)xdr_gd1_mgmt_v3_unlock_rsp);
+
+        gf_log (this->name, GF_LOG_DEBUG,
+                "Responded to mgmt_v3 unlock, ret: %d", ret);
+
+        return ret;
+}
+
+static int
+glusterd_synctasked_mgmt_v3_unlock (rpcsvc_request_t *req,
+                                    gd1_mgmt_v3_unlock_req *unlock_req,
+                                    glusterd_op_lock_ctx_t *ctx)
+{
+        int32_t                         ret         = -1;
+        xlator_t                       *this        = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (req);
+        GF_ASSERT (ctx);
+
+        /* Trying to release multiple mgmt_v3 locks */
+        ret = glusterd_multiple_mgmt_v3_unlock (ctx->dict, ctx->uuid);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Failed to release mgmt_v3 locks for %s",
+                        uuid_utoa(ctx->uuid));
+        }
+
+        ret = glusterd_mgmt_v3_unlock_send_resp (req, ret);
+
+        gf_log (this->name, GF_LOG_TRACE, "Returning %d", ret);
+        return ret;
+}
+
+
+static int
+glusterd_op_state_machine_mgmt_v3_unlock (rpcsvc_request_t *req,
+                                          gd1_mgmt_v3_unlock_req *lock_req,
+                                          glusterd_op_lock_ctx_t *ctx)
+{
+        int32_t                           ret      = -1;
+        xlator_t                         *this     = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (req);
+
+        ret = glusterd_op_sm_inject_event (GD_OP_EVENT_UNLOCK,
+                                           &lock_req->txn_id, ctx);
+        if (ret)
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Failed to inject event GD_OP_EVENT_UNLOCK");
+
+        glusterd_friend_sm ();
+        glusterd_op_sm ();
+
+        gf_log (this->name, GF_LOG_TRACE, "Returning %d", ret);
+        return ret;
+}
+
+static int
+glusterd_handle_mgmt_v3_unlock_fn (rpcsvc_request_t *req)
+{
+        gd1_mgmt_v3_unlock_req            lock_req = {{0},};
+        int32_t                           ret      = -1;
+        glusterd_op_lock_ctx_t           *ctx      = NULL;
+        glusterd_peerinfo_t              *peerinfo = NULL;
+        xlator_t                         *this     = NULL;
+        gf_boolean_t                      is_synctasked = _gf_false;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (req);
+
+        ret = xdr_to_generic (req->msg[0], &lock_req,
+                              (xdrproc_t)xdr_gd1_mgmt_v3_unlock_req);
+        if (ret < 0) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to decode unlock "
+                        "request received from peer");
+                req->rpc_err = GARBAGE_ARGS;
+                goto out;
+        }
+
+        gf_log (this->name, GF_LOG_DEBUG, "Received mgmt_v3 unlock req "
+                "from uuid: %s", uuid_utoa (lock_req.uuid));
+
+        if (glusterd_friend_find_by_uuid (lock_req.uuid, &peerinfo)) {
+                gf_log (this->name, GF_LOG_WARNING, "%s doesn't "
+                        "belong to the cluster. Ignoring request.",
+                        uuid_utoa (lock_req.uuid));
+                ret = -1;
+                goto out;
+        }
+
+        ctx = GF_CALLOC (1, sizeof (*ctx), gf_gld_mt_op_lock_ctx_t);
+        if (!ctx) {
+                ret = -1;
+                goto out;
+        }
+
+        uuid_copy (ctx->uuid, lock_req.uuid);
+        ctx->req = req;
+
+        ctx->dict = dict_new ();
+        if (!ctx->dict) {
+                ret = -1;
+                goto out;
+        }
+
+        ret = dict_unserialize (lock_req.dict.dict_val,
+                                lock_req.dict.dict_len, &ctx->dict);
+        if (ret) {
+                gf_log (this->name, GF_LOG_WARNING,
+                        "failed to unserialize the dictionary");
+                goto out;
+        }
+
+        is_synctasked = dict_get_str_boolean (ctx->dict,
+                                              "is_synctasked", _gf_false);
+        if (is_synctasked)
+                ret = glusterd_synctasked_mgmt_v3_unlock (req, &lock_req, ctx);
+        else
+                ret = glusterd_op_state_machine_mgmt_v3_unlock (req, &lock_req,
+                                                                ctx);
+
+out:
+
+        if (ret) {
+                if (ctx->dict)
+                        dict_unref (ctx->dict);
+                if (ctx)
+                        GF_FREE (ctx);
+        }
+
+        free (lock_req.dict.dict_val);
+
+        gf_log (this->name, GF_LOG_TRACE, "Returning %d", ret);
+        return ret;
+}
+
+int
+glusterd_handle_mgmt_v3_lock (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req,
+                                            glusterd_handle_mgmt_v3_lock_fn);
+}
+
+static int
+glusterd_handle_pre_validate (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req,
+                                            glusterd_handle_pre_validate_fn);
+}
+
+static int
+glusterd_handle_brick_op (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req,
+                                            glusterd_handle_brick_op_fn);
+}
+
+static int
+glusterd_handle_commit (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req,
+                                            glusterd_handle_commit_fn);
+}
+
+static int
+glusterd_handle_post_validate (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req,
+                                            glusterd_handle_post_validate_fn);
+}
+
+int
+glusterd_handle_mgmt_v3_unlock (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req,
+                                            glusterd_handle_mgmt_v3_unlock_fn);
+}
+
+rpcsvc_actor_t gd_svc_mgmt_v3_actors[] = {
+        [GLUSTERD_MGMT_V3_NULL]          = { "NULL",           GLUSTERD_MGMT_V3_NULL,          glusterd_mgmt_v3_null,          NULL, 0, DRC_NA},
+        [GLUSTERD_MGMT_V3_LOCK]          = { "MGMT_V3_LOCK",   GLUSTERD_MGMT_V3_LOCK,          glusterd_handle_mgmt_v3_lock,   NULL, 0, DRC_NA},
+        [GLUSTERD_MGMT_V3_PRE_VALIDATE]  = { "PRE_VAL",        GLUSTERD_MGMT_V3_PRE_VALIDATE,  glusterd_handle_pre_validate,   NULL, 0, DRC_NA},
+        [GLUSTERD_MGMT_V3_BRICK_OP]      = { "BRCK_OP",        GLUSTERD_MGMT_V3_BRICK_OP,      glusterd_handle_brick_op,       NULL, 0, DRC_NA},
+        [GLUSTERD_MGMT_V3_COMMIT]        = { "COMMIT",         GLUSTERD_MGMT_V3_COMMIT,        glusterd_handle_commit,         NULL, 0, DRC_NA},
+        [GLUSTERD_MGMT_V3_POST_VALIDATE] = { "POST_VAL",       GLUSTERD_MGMT_V3_POST_VALIDATE, glusterd_handle_post_validate,  NULL, 0, DRC_NA},
+        [GLUSTERD_MGMT_V3_UNLOCK]        = { "MGMT_V3_UNLOCK", GLUSTERD_MGMT_V3_UNLOCK,        glusterd_handle_mgmt_v3_unlock, NULL, 0, DRC_NA},
+};
+
+struct rpcsvc_program gd_svc_mgmt_v3_prog = {
+        .progname  = "GlusterD svc mgmt v3",
+        .prognum   = GD_MGMT_V3_PROGRAM,
+        .progver   = GD_MGMT_V3_VERSION,
+        .numactors = GLUSTERD_MGMT_V3_MAXVALUE,
+        .actors    = gd_svc_mgmt_v3_actors,
+        .synctask  = _gf_true,
+};
diff --git a/xlators/mgmt/glusterd/src/glusterd-mgmt.c b/xlators/mgmt/glusterd/src/glusterd-mgmt.c
new file mode 100644
index 000000000..d52532e54
--- /dev/null
+++ b/xlators/mgmt/glusterd/src/glusterd-mgmt.c
@@ -0,0 +1,1893 @@
+/*
+   Copyright (c) 2013-2014 Red Hat, Inc. <http://www.redhat.com>
+   This file is part of GlusterFS.
+
+   This file is licensed to you under your choice of the GNU Lesser
+   General Public License, version 3 or any later version (LGPLv3 or
+   later), or the GNU General Public License, version 2 (GPLv2), in all
+   cases as published by the Free Software Foundation.
+*/
+/* rpc related syncops */
+#include "rpc-clnt.h"
+#include "protocol-common.h"
+#include "xdr-generic.h"
+#include "glusterd1-xdr.h"
+#include "glusterd-syncop.h"
+
+#include "glusterd.h"
+#include "glusterd-utils.h"
+#include "glusterd-locks.h"
+#include "glusterd-mgmt.h"
+#include "glusterd-op-sm.h"
+
+extern struct rpc_clnt_program gd_mgmt_v3_prog;
+
+
+static void
+gd_mgmt_v3_collate_errors (struct syncargs *args, int op_ret, int op_errno,
+                           char *op_errstr, int op_code,
+                           glusterd_peerinfo_t *peerinfo, u_char *uuid)
+{
+        char      *peer_str          = NULL;
+        char       err_str[PATH_MAX] = "Please check log file for details.";
+        char       op_err[PATH_MAX]  = "";
+        int32_t    len               = -1;
+        xlator_t  *this              = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (args);
+        GF_ASSERT (uuid);
+
+        if (op_ret) {
+                args->op_ret = op_ret;
+                args->op_errno = op_errno;
+
+                if (peerinfo)
+                        peer_str = peerinfo->hostname;
+                else
+                        peer_str = uuid_utoa (uuid);
+
+                if (op_errstr && strcmp (op_errstr, "")) {
+                        len = snprintf (err_str, sizeof(err_str) - 1,
+                                        "Error: %s", op_errstr);
+                        err_str[len] = '\0';
+                }
+
+                switch (op_code){
+                case GLUSTERD_MGMT_V3_LOCK:
+                        {
+                                len = snprintf (op_err, sizeof(op_err) - 1,
+                                                "Locking failed "
+                                                "on %s. %s", peer_str, err_str);
+                                break;
+                        }
+                case GLUSTERD_MGMT_V3_PRE_VALIDATE:
+                        {
+                                len = snprintf (op_err, sizeof(op_err) - 1,
+                                                "Pre Validation failed "
+                                                "on %s. %s", peer_str, err_str);
+                                break;
+                        }
+                case GLUSTERD_MGMT_V3_BRICK_OP:
+                        {
+                                len = snprintf (op_err, sizeof(op_err) - 1,
+                                                "Brick ops failed "
+                                                "on %s. %s", peer_str, err_str);
+                                break;
+                        }
+                case GLUSTERD_MGMT_V3_COMMIT:
+                        {
+                                len = snprintf (op_err, sizeof(op_err) - 1,
+                                                "Commit failed on %s. %s",
+                                                peer_str, err_str);
+                                break;
+                        }
+                case GLUSTERD_MGMT_V3_POST_VALIDATE:
+                        {
+                                len = snprintf (op_err, sizeof(op_err) - 1,
+                                                "Post Validation failed "
+                                                "on %s. %s", peer_str, err_str);
+                                break;
+                        }
+                case GLUSTERD_MGMT_V3_UNLOCK:
+                        {
+                                len = snprintf (op_err, sizeof(op_err) - 1,
+                                                "Unlocking failed "
+                                                "on %s. %s", peer_str, err_str);
+                                break;
+                        }
+                }
+                op_err[len] = '\0';
+
+                if (args->errstr) {
+                        len = snprintf (err_str, sizeof(err_str) - 1,
+                                        "%s\n%s", args->errstr,
+                                        op_err);
+                        GF_FREE (args->errstr);
+                        args->errstr = NULL;
+                } else
+                        len = snprintf (err_str, sizeof(err_str) - 1,
+                                        "%s", op_err);
+                err_str[len] = '\0';
+
+                gf_log (this->name, GF_LOG_ERROR, "%s", op_err);
+                args->errstr = gf_strdup (err_str);
+        }
+
+        return;
+}
+
+int32_t
+gd_mgmt_v3_pre_validate_fn (glusterd_op_t op, dict_t *dict,
+                            char **op_errstr, dict_t *rsp_dict)
+{
+        int32_t       ret = -1;
+        xlator_t     *this = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (dict);
+        GF_ASSERT (op_errstr);
+        GF_ASSERT (rsp_dict);
+
+        switch (op) {
+               case GD_OP_SNAP:
+               {
+                       ret = glusterd_snapshot_prevalidate (dict, op_errstr,
+                                                            rsp_dict);
+                       if (ret) {
+                               gf_log (this->name, GF_LOG_WARNING,
+                                       "Snapshot Prevalidate Failed");
+                               goto out;
+                       }
+
+                       break;
+               }
+               default:
+                       break;
+        }
+
+        ret = 0;
+out:
+        gf_log (this->name, GF_LOG_DEBUG, "OP = %d. Returning %d", op, ret);
+        return ret;
+}
+
+int32_t
+gd_mgmt_v3_brick_op_fn (glusterd_op_t op, dict_t *dict,
+                        char **op_errstr, dict_t *rsp_dict)
+{
+        int32_t       ret = -1;
+        xlator_t     *this = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (dict);
+        GF_ASSERT (op_errstr);
+        GF_ASSERT (rsp_dict);
+
+        switch (op) {
+        case GD_OP_SNAP:
+        {
+                ret = glusterd_snapshot_brickop (dict, op_errstr, rsp_dict);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_WARNING, "snapshot brickop "
+                                "failed");
+                        goto out;
+                }
+                break;
+        }
+        default:
+                break;
+        }
+
+        ret = 0;
+out:
+        gf_log (this->name, GF_LOG_TRACE, "OP = %d. Returning %d", op, ret);
+        return ret;
+}
+
+int32_t
+gd_mgmt_v3_commit_fn (glusterd_op_t op, dict_t *dict,
+                      char **op_errstr, dict_t *rsp_dict)
+{
+        int32_t       ret = -1;
+        xlator_t     *this = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (dict);
+        GF_ASSERT (op_errstr);
+        GF_ASSERT (rsp_dict);
+
+        switch (op) {
+               case GD_OP_SNAP:
+               {
+                       ret = glusterd_snapshot (dict, op_errstr, rsp_dict);
+                       if (ret) {
+                               gf_log (this->name, GF_LOG_WARNING,
+                                       "Snapshot Commit Failed");
+                               goto out;
+                       }
+                       break;
+               }
+               default:
+                       break;
+        }
+
+        ret = 0;
+out:
+        gf_log (this->name, GF_LOG_DEBUG, "OP = %d. Returning %d", op, ret);
+        return ret;
+}
+
+int32_t
+gd_mgmt_v3_post_validate_fn (glusterd_op_t op, int32_t op_ret, dict_t *dict,
+                             char **op_errstr, dict_t *rsp_dict)
+{
+        int32_t       ret = -1;
+        xlator_t     *this = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (dict);
+        GF_ASSERT (op_errstr);
+        GF_ASSERT (rsp_dict);
+
+        switch (op) {
+               case GD_OP_SNAP:
+               {
+                       ret = glusterd_snapshot_postvalidate (dict, op_ret,
+                                                             op_errstr,
+                                                             rsp_dict);
+                       if (ret) {
+                               gf_log (this->name, GF_LOG_WARNING,
+                                       "postvalidate operation failed");
+                               goto out;
+                       }
+                       break;
+               }
+               default:
+                       break;
+        }
+
+        ret = 0;
+
+out:
+        gf_log (this->name, GF_LOG_TRACE, "OP = %d. Returning %d", op, ret);
+        return ret;
+}
+
+int32_t
+gd_mgmt_v3_lock_cbk_fn (struct rpc_req *req, struct iovec *iov,
+                        int count, void *myframe)
+{
+        int32_t                     ret        = -1;
+        struct syncargs            *args       = NULL;
+        glusterd_peerinfo_t        *peerinfo   = NULL;
+        gd1_mgmt_v3_lock_rsp        rsp        = {{0},};
+        call_frame_t               *frame      = NULL;
+        int32_t                     op_ret     = -1;
+        int32_t                     op_errno   = -1;
+        xlator_t                   *this       = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (req);
+        GF_ASSERT (myframe);
+
+        /* Even though the lock command has failed, while collating the errors
+           (gd_mgmt_v3_collate_errors), args->op_ret and args->op_errno will be
+           used. @args is obtained from frame->local. So before checking the
+           status of the request and going out if its a failure, args should be
+           set to frame->local. Otherwise, while collating args will be NULL.
+           This applies to other phases such as prevalidate, brickop, commit and
+           postvalidate also.
+        */
+        frame  = myframe;
+        args   = frame->local;
+        peerinfo = frame->cookie;
+        frame->local = NULL;
+        frame->cookie = NULL;
+
+        if (-1 == req->rpc_status) {
+                op_errno = ENOTCONN;
+                goto out;
+        }
+
+        if (!iov) {
+                gf_log (this->name, GF_LOG_ERROR, "iov is NULL");
+                op_errno = EINVAL;
+                goto out;
+        }
+
+        ret = xdr_to_generic (*iov, &rsp,
+                              (xdrproc_t)xdr_gd1_mgmt_v3_lock_rsp);
+        if (ret < 0)
+                goto out;
+
+        uuid_copy (args->uuid, rsp.uuid);
+
+        op_ret = rsp.op_ret;
+        op_errno = rsp.op_errno;
+
+out:
+        gd_mgmt_v3_collate_errors (args, op_ret, op_errno, NULL,
+                                   GLUSTERD_MGMT_V3_LOCK,
+                                   peerinfo, rsp.uuid);
+        free (rsp.dict.dict_val);
+        STACK_DESTROY (frame->root);
+        synctask_barrier_wake(args);
+        return 0;
+}
+
+int32_t
+gd_mgmt_v3_lock_cbk (struct rpc_req *req, struct iovec *iov,
+                     int count, void *myframe)
+{
+        return glusterd_big_locked_cbk (req, iov, count, myframe,
+                                        gd_mgmt_v3_lock_cbk_fn);
+}
+
+int
+gd_mgmt_v3_lock (glusterd_op_t op, dict_t *op_ctx,
+                 glusterd_peerinfo_t *peerinfo,
+                 struct syncargs *args, uuid_t my_uuid,
+                 uuid_t recv_uuid)
+{
+        gd1_mgmt_v3_lock_req     req  = {{0},};
+        glusterd_conf_t         *conf = THIS->private;
+        int32_t                  ret  = -1;
+        xlator_t                *this = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (op_ctx);
+        GF_ASSERT (peerinfo);
+        GF_ASSERT (args);
+
+        ret = dict_allocate_and_serialize (op_ctx,
+                                           &req.dict.dict_val,
+                                           &req.dict.dict_len);
+        if (ret)
+                goto out;
+
+        uuid_copy (req.uuid, my_uuid);
+        req.op = op;
+        synclock_unlock (&conf->big_lock);
+        ret = gd_syncop_submit_request (peerinfo->rpc, &req, args, peerinfo,
+                                        &gd_mgmt_v3_prog,
+                                        GLUSTERD_MGMT_V3_LOCK,
+                                        gd_mgmt_v3_lock_cbk,
+                                        (xdrproc_t) xdr_gd1_mgmt_v3_lock_req);
+        synclock_lock (&conf->big_lock);
+out:
+        GF_FREE (req.dict.dict_val);
+        gf_log (this->name, GF_LOG_TRACE, "Returning %d", ret);
+        return ret;
+}
+
+int
+glusterd_mgmt_v3_initiate_lockdown (glusterd_conf_t  *conf, glusterd_op_t op,
+                                    dict_t *dict, char **op_errstr, int npeers,
+                                    gf_boolean_t  *is_acquired)
+{
+        char                *volname    = NULL;
+        glusterd_peerinfo_t *peerinfo   = NULL;
+        int32_t              ret        = -1;
+        int32_t              peer_cnt   = 0;
+        struct syncargs      args       = {0};
+        struct list_head    *peers      = NULL;
+        uuid_t               peer_uuid  = {0};
+        xlator_t            *this       = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (conf);
+        GF_ASSERT (dict);
+        GF_ASSERT (op_errstr);
+        GF_ASSERT (is_acquired);
+
+        peers = &conf->xaction_peers;
+
+        /* Trying to acquire multiple mgmt_v3 locks on local node */
+        ret = glusterd_multiple_mgmt_v3_lock (dict, MY_UUID);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Failed to acquire mgmt_v3 locks on localhost");
+                goto out;
+        }
+
+        *is_acquired = _gf_true;
+
+        if (!npeers) {
+                ret = 0;
+                goto out;
+        }
+
+        /* Sending mgmt_v3 lock req to other nodes in the cluster */
+        gd_syncargs_init (&args, NULL);
+        synctask_barrier_init((&args));
+        peer_cnt = 0;
+        list_for_each_entry (peerinfo, peers, op_peers_list) {
+                gd_mgmt_v3_lock (op, dict, peerinfo, &args,
+                                 MY_UUID, peer_uuid);
+                peer_cnt++;
+        }
+        gd_synctask_barrier_wait((&args), peer_cnt);
+
+        if (args.errstr)
+                *op_errstr = gf_strdup (args.errstr);
+
+        ret = args.op_ret;
+
+        gf_log (this->name, GF_LOG_DEBUG, "Sent lock op req for %s "
+                "to %d peers. Returning %d", gd_op_list[op], peer_cnt, ret);
+out:
+        if (ret) {
+                if (*op_errstr)
+                        gf_log (this->name, GF_LOG_ERROR, "%s",
+                                *op_errstr);
+
+                if (volname)
+                        ret = gf_asprintf (op_errstr,
+                                           "Another transaction is in progress "
+                                           "for %s. Please try again after "
+                                           "sometime.", volname);
+                else
+                        ret = gf_asprintf (op_errstr,
+                                           "Another transaction is in progress "
+                                           "Please try again after sometime.");
+
+                if (ret == -1)
+                        *op_errstr = NULL;
+
+                ret = -1;
+        }
+
+        return ret;
+}
+
+int
+glusterd_pre_validate_aggr_rsp_dict (glusterd_op_t op, dict_t *aggr, dict_t *rsp)
+{
+        int32_t              ret      = 0;
+        xlator_t            *this     = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (aggr);
+        GF_ASSERT (rsp);
+
+        switch (op) {
+        case GD_OP_SNAP:
+                ret = glusterd_snap_pre_validate_use_rsp_dict (aggr, rsp);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Failed to aggregate prevalidate "
+                                "response dictionaries.");
+                        goto out;
+                }
+                break;
+        default:
+                ret = -1;
+                gf_log (this->name, GF_LOG_ERROR, "Invalid op (%s)", gd_op_list[op]);
+
+                break;
+        }
+out:
+        return ret;
+}
+
+int32_t
+gd_mgmt_v3_pre_validate_cbk_fn (struct rpc_req *req, struct iovec *iov,
+                                int count, void *myframe)
+{
+        int32_t                     ret        = -1;
+        struct syncargs            *args       = NULL;
+        glusterd_peerinfo_t        *peerinfo   = NULL;
+        gd1_mgmt_v3_pre_val_rsp      rsp        = {{0},};
+        call_frame_t               *frame      = NULL;
+        int32_t                     op_ret     = -1;
+        int32_t                     op_errno   = -1;
+        dict_t                     *rsp_dict   = NULL;
+        xlator_t                   *this       = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (req);
+        GF_ASSERT (myframe);
+
+        frame  = myframe;
+        args   = frame->local;
+        peerinfo = frame->cookie;
+        frame->local = NULL;
+        frame->cookie = NULL;
+
+        if (-1 == req->rpc_status) {
+                op_errno = ENOTCONN;
+                goto out;
+        }
+
+        if (!iov) {
+                gf_log (this->name, GF_LOG_ERROR, "iov is NULL");
+                op_errno = EINVAL;
+        }
+
+        ret = xdr_to_generic (*iov, &rsp,
+                              (xdrproc_t)xdr_gd1_mgmt_v3_pre_val_rsp);
+        if (ret < 0)
+                goto out;
+
+        if (rsp.dict.dict_len) {
+                /* Unserialize the dictionary */
+                rsp_dict  = dict_new ();
+
+                ret = dict_unserialize (rsp.dict.dict_val,
+                                        rsp.dict.dict_len,
+                                        &rsp_dict);
+                if (ret < 0) {
+                        GF_FREE (rsp.dict.dict_val);
+                        goto out;
+                } else {
+                        rsp_dict->extra_stdfree = rsp.dict.dict_val;
+                }
+        }
+
+        uuid_copy (args->uuid, rsp.uuid);
+        pthread_mutex_lock (&args->lock_dict);
+        {
+                ret = glusterd_pre_validate_aggr_rsp_dict (rsp.op, args->dict,
+                                                           rsp_dict);
+        }
+        pthread_mutex_unlock (&args->lock_dict);
+
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "%s",
+                        "Failed to aggregate response from "
+                        " node/brick");
+                if (!rsp.op_ret)
+                        op_ret = ret;
+                else {
+                        op_ret = rsp.op_ret;
+                        op_errno = rsp.op_errno;
+                }
+        } else {
+                op_ret = rsp.op_ret;
+                op_errno = rsp.op_errno;
+        }
+
+out:
+        if (rsp_dict)
+                dict_unref (rsp_dict);
+
+        gd_mgmt_v3_collate_errors (args, op_ret, op_errno, NULL,
+                                  GLUSTERD_MGMT_V3_PRE_VALIDATE,
+                                  peerinfo, rsp.uuid);
+
+        if (rsp.op_errstr)
+                free (rsp.op_errstr);
+
+        STACK_DESTROY (frame->root);
+        synctask_barrier_wake(args);
+        return 0;
+}
+
+int32_t
+gd_mgmt_v3_pre_validate_cbk (struct rpc_req *req, struct iovec *iov,
+                             int count, void *myframe)
+{
+        return glusterd_big_locked_cbk (req, iov, count, myframe,
+                                        gd_mgmt_v3_pre_validate_cbk_fn);
+}
+
+int
+gd_mgmt_v3_pre_validate_req (glusterd_op_t op, dict_t *op_ctx,
+                             glusterd_peerinfo_t *peerinfo,
+                             struct syncargs *args, uuid_t my_uuid,
+                             uuid_t recv_uuid)
+{
+        int32_t                  ret   = -1;
+        gd1_mgmt_v3_pre_val_req  req   = {{0},};
+        glusterd_conf_t         *conf  = THIS->private;
+        xlator_t                *this  = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (op_ctx);
+        GF_ASSERT (peerinfo);
+        GF_ASSERT (args);
+
+        ret = dict_allocate_and_serialize (op_ctx,
+                                           &req.dict.dict_val,
+                                           &req.dict.dict_len);
+        if (ret)
+                goto out;
+
+        uuid_copy (req.uuid, my_uuid);
+        req.op = op;
+        synclock_unlock (&conf->big_lock);
+        ret = gd_syncop_submit_request (peerinfo->rpc, &req, args, peerinfo,
+                                        &gd_mgmt_v3_prog,
+                                        GLUSTERD_MGMT_V3_PRE_VALIDATE,
+                                        gd_mgmt_v3_pre_validate_cbk,
+                                        (xdrproc_t) xdr_gd1_mgmt_v3_pre_val_req);
+        synclock_lock (&conf->big_lock);
+out:
+        GF_FREE (req.dict.dict_val);
+        gf_log (this->name, GF_LOG_TRACE, "Returning %d", ret);
+        return ret;
+}
+
+int
+glusterd_mgmt_v3_pre_validate (glusterd_conf_t  *conf, glusterd_op_t op,
+                               dict_t *req_dict, char **op_errstr, int npeers)
+{
+        int32_t              ret        = -1;
+        int32_t              peer_cnt   = 0;
+        dict_t              *rsp_dict   = NULL;
+        glusterd_peerinfo_t *peerinfo   = NULL;
+        struct syncargs      args       = {0};
+        struct list_head    *peers      = NULL;
+        uuid_t               peer_uuid  = {0};
+        xlator_t            *this       = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (conf);
+        GF_ASSERT (req_dict);
+        GF_ASSERT (op_errstr);
+
+        peers = &conf->xaction_peers;
+
+        rsp_dict = dict_new ();
+        if (!rsp_dict) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Failed to create response dictionary");
+                goto out;
+        }
+
+        /* Pre Validation on local node */
+        ret = gd_mgmt_v3_pre_validate_fn (op, req_dict, op_errstr,
+                                          rsp_dict);
+
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Pre Validation failed for "
+                        "operation %s on local node",
+                        gd_op_list[op]);
+
+                if (*op_errstr == NULL) {
+                        ret = gf_asprintf (op_errstr,
+                                           "Pre-validation failed "
+                                           "on localhost. Please "
+                                           "check log file for details");
+                        if (ret == -1)
+                                *op_errstr = NULL;
+
+                        ret = -1;
+                }
+                goto out;
+        }
+
+        ret = glusterd_pre_validate_aggr_rsp_dict (op, req_dict,
+                                                   rsp_dict);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "%s",
+                        "Failed to aggregate response from "
+                        " node/brick");
+                goto out;
+        }
+
+        dict_unref (rsp_dict);
+        rsp_dict = NULL;
+
+        if (!npeers) {
+                ret = 0;
+                goto out;
+        }
+
+        /* Sending Pre Validation req to other nodes in the cluster */
+        gd_syncargs_init (&args, req_dict);
+        synctask_barrier_init((&args));
+        peer_cnt = 0;
+        list_for_each_entry (peerinfo, peers, op_peers_list) {
+                gd_mgmt_v3_pre_validate_req (op, req_dict, peerinfo, &args,
+                                             MY_UUID, peer_uuid);
+                peer_cnt++;
+        }
+        gd_synctask_barrier_wait((&args), peer_cnt);
+
+        if (args.op_ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Pre Validation failed on peers");
+
+                if (args.errstr)
+                         *op_errstr = gf_strdup (args.errstr);
+        }
+
+        ret = args.op_ret;
+
+        gf_log (this->name, GF_LOG_DEBUG, "Sent pre valaidation req for %s "
+                "to %d peers. Returning %d", gd_op_list[op], peer_cnt, ret);
+out:
+        return ret;
+}
+
+int
+glusterd_mgmt_v3_build_payload (dict_t **req, char **op_errstr, dict_t *dict,
+                                glusterd_op_t op)
+{
+        int32_t                 ret      = -1;
+        dict_t                 *req_dict = NULL;
+        xlator_t               *this     = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (req);
+        GF_ASSERT (op_errstr);
+        GF_ASSERT (dict);
+
+        req_dict = dict_new ();
+        if (!req_dict)
+                goto out;
+
+        switch (op) {
+                case GD_OP_SNAP:
+                        dict_copy (dict, req_dict);
+                        break;
+                default:
+                        break;
+        }
+
+        *req = req_dict;
+        ret = 0;
+out:
+        return ret;
+}
+
+int32_t
+gd_mgmt_v3_brick_op_cbk_fn (struct rpc_req *req, struct iovec *iov,
+                            int count, void *myframe)
+{
+        int32_t                     ret        = -1;
+        struct syncargs            *args       = NULL;
+        glusterd_peerinfo_t        *peerinfo   = NULL;
+        gd1_mgmt_v3_brick_op_rsp     rsp        = {{0},};
+        call_frame_t               *frame      = NULL;
+        int32_t                     op_ret     = -1;
+        int32_t                     op_errno   = -1;
+        xlator_t                   *this       = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (req);
+        GF_ASSERT (myframe);
+
+        frame  = myframe;
+        args   = frame->local;
+        peerinfo = frame->cookie;
+        frame->local = NULL;
+        frame->cookie = NULL;
+
+        /* If the operation failed, then iov can be NULL. So better check the
+           status of the operation and then worry about iov (if the status of
+           the command is success)
+        */
+        if (-1 == req->rpc_status) {
+                op_errno = ENOTCONN;
+                goto out;
+        }
+
+        if (!iov) {
+                gf_log (this->name, GF_LOG_ERROR, "iov is NULL");
+                op_errno = EINVAL;
+                goto out;
+        }
+
+        ret = xdr_to_generic (*iov, &rsp,
+                              (xdrproc_t)xdr_gd1_mgmt_v3_brick_op_rsp);
+        if (ret < 0)
+                goto out;
+
+        uuid_copy (args->uuid, rsp.uuid);
+
+        op_ret = rsp.op_ret;
+        op_errno = rsp.op_errno;
+
+out:
+        gd_mgmt_v3_collate_errors (args, op_ret, op_errno, NULL,
+                                   GLUSTERD_MGMT_V3_BRICK_OP,
+                                   peerinfo, rsp.uuid);
+
+        if (rsp.op_errstr)
+                free (rsp.op_errstr);
+
+        free (rsp.dict.dict_val);
+
+        STACK_DESTROY (frame->root);
+        synctask_barrier_wake(args);
+        return 0;
+}
+
+int32_t
+gd_mgmt_v3_brick_op_cbk (struct rpc_req *req, struct iovec *iov,
+                         int count, void *myframe)
+{
+        return glusterd_big_locked_cbk (req, iov, count, myframe,
+                                        gd_mgmt_v3_brick_op_cbk_fn);
+}
+
+int
+gd_mgmt_v3_brick_op_req (glusterd_op_t op, dict_t *op_ctx,
+                         glusterd_peerinfo_t *peerinfo,
+                         struct syncargs *args, uuid_t my_uuid,
+                         uuid_t recv_uuid)
+{
+        int32_t                   ret  = -1;
+        gd1_mgmt_v3_brick_op_req  req  = {{0},};
+        glusterd_conf_t          *conf = THIS->private;
+        xlator_t                 *this = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (op_ctx);
+        GF_ASSERT (peerinfo);
+        GF_ASSERT (args);
+
+        ret = dict_allocate_and_serialize (op_ctx,
+                                           &req.dict.dict_val,
+                                           &req.dict.dict_len);
+        if (ret)
+                goto out;
+
+        uuid_copy (req.uuid, my_uuid);
+        req.op = op;
+        synclock_unlock (&conf->big_lock);
+        ret = gd_syncop_submit_request (peerinfo->rpc, &req, args, peerinfo,
+                                        &gd_mgmt_v3_prog,
+                                        GLUSTERD_MGMT_V3_BRICK_OP,
+                                        gd_mgmt_v3_brick_op_cbk,
+                                        (xdrproc_t) xdr_gd1_mgmt_v3_brick_op_req);
+        synclock_lock (&conf->big_lock);
+out:
+        GF_FREE (req.dict.dict_val);
+        gf_log (this->name, GF_LOG_TRACE, "Returning %d", ret);
+        return ret;
+}
+
+int
+glusterd_mgmt_v3_brick_op (glusterd_conf_t  *conf, glusterd_op_t op,
+                           dict_t *req_dict, char **op_errstr, int npeers)
+{
+        int32_t              ret        = -1;
+        int32_t              peer_cnt   = 0;
+        dict_t              *rsp_dict   = NULL;
+        glusterd_peerinfo_t *peerinfo   = NULL;
+        struct syncargs      args       = {0};
+        struct list_head    *peers      = NULL;
+        uuid_t               peer_uuid  = {0};
+        xlator_t            *this       = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (conf);
+        GF_ASSERT (req_dict);
+        GF_ASSERT (op_errstr);
+
+        peers = &conf->xaction_peers;
+
+        rsp_dict = dict_new ();
+        if (!rsp_dict) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Failed to create response dictionary");
+                goto out;
+        }
+
+        /* Perform brick op on local node */
+        ret = gd_mgmt_v3_brick_op_fn (op, req_dict, op_errstr,
+                                     rsp_dict);
+
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Brick ops failed for "
+                        "operation %s on local node",
+                        gd_op_list[op]);
+
+                if (*op_errstr == NULL) {
+                        ret = gf_asprintf (op_errstr,
+                                           "Brick ops failed "
+                                           "on localhost. Please "
+                                           "check log file for details");
+                        if (ret == -1)
+                                *op_errstr = NULL;
+
+                        ret = -1;
+                }
+                goto out;
+        }
+
+        dict_unref (rsp_dict);
+        rsp_dict = NULL;
+
+        if (!npeers) {
+                ret = 0;
+                goto out;
+        }
+
+        /* Sending brick op req to other nodes in the cluster */
+        gd_syncargs_init (&args, NULL);
+        synctask_barrier_init((&args));
+        peer_cnt = 0;
+        list_for_each_entry (peerinfo, peers, op_peers_list) {
+                gd_mgmt_v3_brick_op_req (op, req_dict, peerinfo, &args,
+                                         MY_UUID, peer_uuid);
+                peer_cnt++;
+        }
+        gd_synctask_barrier_wait((&args), peer_cnt);
+
+        if (args.op_ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Brick ops failed on peers");
+
+                if (args.errstr)
+                         *op_errstr = gf_strdup (args.errstr);
+        }
+
+        ret = args.op_ret;
+
+        gf_log (this->name, GF_LOG_DEBUG, "Sent brick op req for %s "
+                "to %d peers. Returning %d", gd_op_list[op], peer_cnt, ret);
+out:
+        return ret;
+}
+
+int32_t
+gd_mgmt_v3_commit_cbk_fn (struct rpc_req *req, struct iovec *iov,
+                          int count, void *myframe)
+{
+        int32_t                     ret        = -1;
+        struct syncargs            *args       = NULL;
+        glusterd_peerinfo_t        *peerinfo   = NULL;
+        gd1_mgmt_v3_commit_rsp       rsp        = {{0},};
+        call_frame_t               *frame      = NULL;
+        int32_t                     op_ret     = -1;
+        int32_t                     op_errno   = -1;
+        dict_t                     *rsp_dict   = NULL;
+        xlator_t                   *this       = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (req);
+        GF_ASSERT (myframe);
+
+        frame  = myframe;
+        args   = frame->local;
+        peerinfo = frame->cookie;
+        frame->local = NULL;
+        frame->cookie = NULL;
+
+        if (-1 == req->rpc_status) {
+                op_errno = ENOTCONN;
+                goto out;
+        }
+
+        if (!iov) {
+                gf_log (this->name, GF_LOG_ERROR, "iov is NULL");
+                op_errno = EINVAL;
+                goto out;
+        }
+
+        ret = xdr_to_generic (*iov, &rsp,
+                              (xdrproc_t)xdr_gd1_mgmt_v3_commit_rsp);
+        if (ret < 0)
+                goto out;
+
+        if (rsp.dict.dict_len) {
+                /* Unserialize the dictionary */
+                rsp_dict  = dict_new ();
+
+                ret = dict_unserialize (rsp.dict.dict_val,
+                                        rsp.dict.dict_len,
+                                        &rsp_dict);
+                if (ret < 0) {
+                        GF_FREE (rsp.dict.dict_val);
+                        goto out;
+                } else {
+                        rsp_dict->extra_stdfree = rsp.dict.dict_val;
+                }
+        }
+
+        uuid_copy (args->uuid, rsp.uuid);
+        pthread_mutex_lock (&args->lock_dict);
+        {
+                ret = glusterd_syncop_aggr_rsp_dict (rsp.op, args->dict,
+                                                     rsp_dict);
+        }
+        pthread_mutex_unlock (&args->lock_dict);
+
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "%s",
+                        "Failed to aggregate response from "
+                        " node/brick");
+                if (!rsp.op_ret)
+                        op_ret = ret;
+                else {
+                        op_ret = rsp.op_ret;
+                        op_errno = rsp.op_errno;
+                }
+        } else {
+                op_ret = rsp.op_ret;
+                op_errno = rsp.op_errno;
+        }
+
+out:
+        if (rsp_dict)
+                dict_unref (rsp_dict);
+
+        gd_mgmt_v3_collate_errors (args, op_ret, op_errno, NULL,
+                                  GLUSTERD_MGMT_V3_COMMIT,
+                                  peerinfo, rsp.uuid);
+
+        STACK_DESTROY (frame->root);
+        synctask_barrier_wake(args);
+        return 0;
+}
+
+int32_t
+gd_mgmt_v3_commit_cbk (struct rpc_req *req, struct iovec *iov,
+                       int count, void *myframe)
+{
+        return glusterd_big_locked_cbk (req, iov, count, myframe,
+                                        gd_mgmt_v3_commit_cbk_fn);
+}
+
+int
+gd_mgmt_v3_commit_req (glusterd_op_t op, dict_t *op_ctx,
+                       glusterd_peerinfo_t *peerinfo,
+                       struct syncargs *args, uuid_t my_uuid,
+                       uuid_t recv_uuid)
+{
+        int32_t                  ret  = -1;
+        gd1_mgmt_v3_commit_req   req  = {{0},};
+        glusterd_conf_t         *conf = THIS->private;
+        xlator_t                *this = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (op_ctx);
+        GF_ASSERT (peerinfo);
+        GF_ASSERT (args);
+
+        ret = dict_allocate_and_serialize (op_ctx,
+                                           &req.dict.dict_val,
+                                           &req.dict.dict_len);
+        if (ret)
+                goto out;
+
+        uuid_copy (req.uuid, my_uuid);
+        req.op = op;
+        synclock_unlock (&conf->big_lock);
+        ret = gd_syncop_submit_request (peerinfo->rpc, &req, args, peerinfo,
+                                        &gd_mgmt_v3_prog,
+                                        GLUSTERD_MGMT_V3_COMMIT,
+                                        gd_mgmt_v3_commit_cbk,
+                                        (xdrproc_t) xdr_gd1_mgmt_v3_commit_req);
+        synclock_lock (&conf->big_lock);
+out:
+        GF_FREE (req.dict.dict_val);
+        gf_log (this->name, GF_LOG_TRACE, "Returning %d", ret);
+        return ret;
+}
+
+int
+glusterd_mgmt_v3_commit (glusterd_conf_t  *conf, glusterd_op_t op,
+                         dict_t *op_ctx, dict_t *req_dict,
+                         char **op_errstr, int npeers)
+{
+        int32_t              ret        = -1;
+        int32_t              peer_cnt   = 0;
+        dict_t              *rsp_dict   = NULL;
+        glusterd_peerinfo_t *peerinfo   = NULL;
+        struct syncargs      args       = {0};
+        struct list_head    *peers      = NULL;
+        uuid_t               peer_uuid  = {0};
+        xlator_t            *this       = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (conf);
+        GF_ASSERT (op_ctx);
+        GF_ASSERT (req_dict);
+        GF_ASSERT (op_errstr);
+
+        peers = &conf->xaction_peers;
+
+        rsp_dict = dict_new ();
+        if (!rsp_dict) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Failed to create response dictionary");
+                goto out;
+        }
+
+        /* Commit on local node */
+        ret = gd_mgmt_v3_commit_fn (op, req_dict, op_errstr,
+                                   rsp_dict);
+
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Commit failed for "
+                        "operation %s on local node",
+                        gd_op_list[op]);
+
+                if (*op_errstr == NULL) {
+                        ret = gf_asprintf (op_errstr,
+                                           "Commit failed "
+                                           "on localhost. Please "
+                                           "check log file for details.");
+                        if (ret == -1)
+                                *op_errstr = NULL;
+
+                        ret = -1;
+                }
+                goto out;
+        }
+
+        ret = glusterd_syncop_aggr_rsp_dict (op, op_ctx,
+                                             rsp_dict);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "%s",
+                        "Failed to aggregate response from "
+                        " node/brick");
+                goto out;
+        }
+
+        dict_unref (rsp_dict);
+        rsp_dict = NULL;
+
+        if (!npeers) {
+                ret = 0;
+                goto out;
+        }
+
+        /* Sending commit req to other nodes in the cluster */
+        gd_syncargs_init (&args, op_ctx);
+        synctask_barrier_init((&args));
+        peer_cnt = 0;
+        list_for_each_entry (peerinfo, peers, op_peers_list) {
+                gd_mgmt_v3_commit_req (op, req_dict, peerinfo, &args,
+                                       MY_UUID, peer_uuid);
+                peer_cnt++;
+        }
+        gd_synctask_barrier_wait((&args), peer_cnt);
+
+        if (args.op_ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Commit failed on peers");
+
+                if (args.errstr)
+                         *op_errstr = gf_strdup (args.errstr);
+        }
+
+        ret = args.op_ret;
+
+        gf_log (this->name, GF_LOG_DEBUG, "Sent commit req for %s to %d "
+                "peers. Returning %d", gd_op_list[op], peer_cnt, ret);
+out:
+        return ret;
+}
+
+int32_t
+gd_mgmt_v3_post_validate_cbk_fn (struct rpc_req *req, struct iovec *iov,
+                                 int count, void *myframe)
+{
+        int32_t                     ret        = -1;
+        struct syncargs            *args       = NULL;
+        glusterd_peerinfo_t        *peerinfo   = NULL;
+        gd1_mgmt_v3_post_val_rsp     rsp        = {{0},};
+        call_frame_t               *frame      = NULL;
+        int32_t                     op_ret     = -1;
+        int32_t                     op_errno   = -1;
+        xlator_t                   *this       = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (req);
+        GF_ASSERT (myframe);
+
+        frame  = myframe;
+        args   = frame->local;
+        peerinfo = frame->cookie;
+        frame->local = NULL;
+        frame->cookie = NULL;
+
+        if (-1 == req->rpc_status) {
+                op_errno = ENOTCONN;
+                goto out;
+        }
+
+        if (!iov) {
+                gf_log (this->name, GF_LOG_ERROR, "iov is NULL");
+                op_errno = EINVAL;
+                goto out;
+        }
+
+        ret = xdr_to_generic (*iov, &rsp,
+                              (xdrproc_t)xdr_gd1_mgmt_v3_post_val_rsp);
+        if (ret < 0)
+                goto out;
+
+        uuid_copy (args->uuid, rsp.uuid);
+
+        op_ret = rsp.op_ret;
+        op_errno = rsp.op_errno;
+
+out:
+        gd_mgmt_v3_collate_errors (args, op_ret, op_errno, NULL,
+                                  GLUSTERD_MGMT_V3_POST_VALIDATE,
+                                  peerinfo, rsp.uuid);
+        if (rsp.op_errstr)
+                free (rsp.op_errstr);
+
+        free (rsp.dict.dict_val);
+        STACK_DESTROY (frame->root);
+        synctask_barrier_wake(args);
+        return 0;
+}
+
+int32_t
+gd_mgmt_v3_post_validate_cbk (struct rpc_req *req, struct iovec *iov,
+                              int count, void *myframe)
+{
+        return glusterd_big_locked_cbk (req, iov, count, myframe,
+                                        gd_mgmt_v3_post_validate_cbk_fn);
+}
+
+int
+gd_mgmt_v3_post_validate_req (glusterd_op_t op, int32_t op_ret, dict_t *op_ctx,
+                              glusterd_peerinfo_t *peerinfo,
+                              struct syncargs *args, uuid_t my_uuid,
+                              uuid_t recv_uuid)
+{
+        int32_t                   ret  = -1;
+        gd1_mgmt_v3_post_val_req  req  = {{0},};
+        glusterd_conf_t          *conf = THIS->private;
+        xlator_t                 *this = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (op_ctx);
+        GF_ASSERT (peerinfo);
+        GF_ASSERT (args);
+
+        ret = dict_allocate_and_serialize (op_ctx,
+                                           &req.dict.dict_val,
+                                           &req.dict.dict_len);
+        if (ret)
+                goto out;
+
+        uuid_copy (req.uuid, my_uuid);
+        req.op = op;
+        req.op_ret = op_ret;
+        synclock_unlock (&conf->big_lock);
+        ret = gd_syncop_submit_request (peerinfo->rpc, &req, args, peerinfo,
+                                        &gd_mgmt_v3_prog,
+                                        GLUSTERD_MGMT_V3_POST_VALIDATE,
+                                        gd_mgmt_v3_post_validate_cbk,
+                                        (xdrproc_t) xdr_gd1_mgmt_v3_post_val_req);
+        synclock_lock (&conf->big_lock);
+out:
+        GF_FREE (req.dict.dict_val);
+        gf_log (this->name, GF_LOG_TRACE, "Returning %d", ret);
+        return ret;
+}
+
+int
+glusterd_mgmt_v3_post_validate (glusterd_conf_t  *conf, glusterd_op_t op,
+                                int32_t op_ret, dict_t *dict, dict_t *req_dict,
+                                char **op_errstr, int npeers)
+{
+        int32_t              ret        = -1;
+        int32_t              peer_cnt   = 0;
+        dict_t              *rsp_dict   = NULL;
+        glusterd_peerinfo_t *peerinfo   = NULL;
+        struct syncargs      args       = {0};
+        struct list_head    *peers      = NULL;
+        uuid_t               peer_uuid  = {0};
+        xlator_t            *this       = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (conf);
+        GF_ASSERT (dict);
+        GF_ASSERT (req_dict);
+        GF_ASSERT (op_errstr);
+
+        peers = &conf->xaction_peers;
+        GF_ASSERT (peers);
+
+        rsp_dict = dict_new ();
+        if (!rsp_dict) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Failed to create response dictionary");
+                goto out;
+        }
+
+        /* Copy the contents of dict like missed snaps info to req_dict */
+        dict_copy (dict, req_dict);
+
+        /* Post Validation on local node */
+        ret = gd_mgmt_v3_post_validate_fn (op, op_ret, req_dict, op_errstr,
+                                           rsp_dict);
+
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Post Validation failed for "
+                        "operation %s on local node",
+                        gd_op_list[op]);
+
+                if (*op_errstr == NULL) {
+                        ret = gf_asprintf (op_errstr,
+                                           "Post-validation failed "
+                                           "on localhost. Please check "
+                                           "log file for details");
+                        if (ret == -1)
+                                *op_errstr = NULL;
+
+                        ret = -1;
+                }
+                goto out;
+        }
+
+        dict_unref (rsp_dict);
+        rsp_dict = NULL;
+
+        if (!npeers) {
+                ret = 0;
+                goto out;
+        }
+
+        /* Sending Post Validation req to other nodes in the cluster */
+        gd_syncargs_init (&args, req_dict);
+        synctask_barrier_init((&args));
+        peer_cnt = 0;
+        list_for_each_entry (peerinfo, peers, op_peers_list) {
+                gd_mgmt_v3_post_validate_req (op, op_ret, req_dict, peerinfo,
+                                              &args, MY_UUID, peer_uuid);
+                peer_cnt++;
+        }
+        gd_synctask_barrier_wait((&args), peer_cnt);
+
+        if (args.op_ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Post Validation failed on peers");
+
+                if (args.errstr)
+                         *op_errstr = gf_strdup (args.errstr);
+        }
+
+        ret = args.op_ret;
+
+        gf_log (this->name, GF_LOG_DEBUG, "Sent post valaidation req for %s "
+                "to %d peers. Returning %d", gd_op_list[op], peer_cnt, ret);
+out:
+        return ret;
+}
+
+int32_t
+gd_mgmt_v3_unlock_cbk_fn (struct rpc_req *req, struct iovec *iov,
+                          int count, void *myframe)
+{
+        int32_t                     ret        = -1;
+        struct syncargs            *args       = NULL;
+        glusterd_peerinfo_t        *peerinfo   = NULL;
+        gd1_mgmt_v3_unlock_rsp      rsp        = {{0},};
+        call_frame_t               *frame      = NULL;
+        int32_t                     op_ret     = -1;
+        int32_t                     op_errno   = -1;
+        xlator_t                   *this       = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (req);
+        GF_ASSERT (myframe);
+
+        frame  = myframe;
+        args   = frame->local;
+        peerinfo = frame->cookie;
+        frame->local = NULL;
+        frame->cookie = NULL;
+
+        if (-1 == req->rpc_status) {
+                op_errno = ENOTCONN;
+                goto out;
+        }
+
+        if (!iov) {
+                gf_log (this->name, GF_LOG_ERROR, "iov is NULL");
+                op_errno = EINVAL;
+                goto out;
+        }
+
+        ret = xdr_to_generic (*iov, &rsp,
+                              (xdrproc_t)xdr_gd1_mgmt_v3_unlock_rsp);
+        if (ret < 0)
+                goto out;
+
+        uuid_copy (args->uuid, rsp.uuid);
+
+        op_ret = rsp.op_ret;
+        op_errno = rsp.op_errno;
+
+out:
+        gd_mgmt_v3_collate_errors (args, op_ret, op_errno, NULL,
+                                   GLUSTERD_MGMT_V3_UNLOCK,
+                                   peerinfo, rsp.uuid);
+        free (rsp.dict.dict_val);
+        STACK_DESTROY (frame->root);
+        synctask_barrier_wake(args);
+        return 0;
+}
+
+int32_t
+gd_mgmt_v3_unlock_cbk (struct rpc_req *req, struct iovec *iov,
+                       int count, void *myframe)
+{
+        return glusterd_big_locked_cbk (req, iov, count, myframe,
+                                        gd_mgmt_v3_unlock_cbk_fn);
+}
+
+int
+gd_mgmt_v3_unlock (glusterd_op_t op, dict_t *op_ctx,
+                   glusterd_peerinfo_t *peerinfo,
+                   struct syncargs *args, uuid_t my_uuid,
+                   uuid_t recv_uuid)
+{
+        int32_t                  ret  = -1;
+        gd1_mgmt_v3_unlock_req   req  = {{0},};
+        glusterd_conf_t         *conf = THIS->private;
+        xlator_t                *this = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (op_ctx);
+        GF_ASSERT (peerinfo);
+        GF_ASSERT (args);
+
+        ret = dict_allocate_and_serialize (op_ctx,
+                                           &req.dict.dict_val,
+                                           &req.dict.dict_len);
+        if (ret)
+                goto out;
+
+        uuid_copy (req.uuid, my_uuid);
+        req.op = op;
+        synclock_unlock (&conf->big_lock);
+        ret = gd_syncop_submit_request (peerinfo->rpc, &req, args, peerinfo,
+                                        &gd_mgmt_v3_prog,
+                                        GLUSTERD_MGMT_V3_UNLOCK,
+                                        gd_mgmt_v3_unlock_cbk,
+                                        (xdrproc_t) xdr_gd1_mgmt_v3_unlock_req);
+        synclock_lock (&conf->big_lock);
+out:
+        GF_FREE (req.dict.dict_val);
+        gf_log (this->name, GF_LOG_TRACE, "Returning %d", ret);
+        return ret;
+}
+
+int
+glusterd_mgmt_v3_release_peer_locks (glusterd_conf_t  *conf, glusterd_op_t op,
+                                     dict_t *dict, int32_t op_ret,
+                                     char **op_errstr, int npeers,
+                                     gf_boolean_t  is_acquired)
+{
+        int32_t              ret        = -1;
+        int32_t              peer_cnt   = 0;
+        uuid_t               peer_uuid  = {0};
+        xlator_t            *this       = NULL;
+        glusterd_peerinfo_t *peerinfo   = NULL;
+        struct syncargs      args       = {0};
+        struct list_head    *peers      = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (conf);
+        GF_ASSERT (dict);
+        GF_ASSERT (op_errstr);
+
+        peers = &conf->xaction_peers;
+
+        /* If the lock has not been held during this
+         * transaction, do not send unlock requests */
+        if (!is_acquired)
+                goto out;
+
+        if (!npeers) {
+                ret = 0;
+                goto out;
+        }
+
+        /* Sending mgmt_v3 unlock req to other nodes in the cluster */
+        gd_syncargs_init (&args, NULL);
+        synctask_barrier_init((&args));
+        peer_cnt = 0;
+        list_for_each_entry (peerinfo, peers, op_peers_list) {
+                gd_mgmt_v3_unlock (op, dict, peerinfo, &args,
+                                   MY_UUID, peer_uuid);
+                peer_cnt++;
+        }
+        gd_synctask_barrier_wait((&args), peer_cnt);
+
+        if (args.op_ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Unlock failed on peers");
+
+                if (!op_ret && args.errstr)
+                         *op_errstr = gf_strdup (args.errstr);
+        }
+
+        ret = args.op_ret;
+
+        gf_log (this->name, GF_LOG_DEBUG, "Sent unlock op req for %s "
+                "to %d peers. Returning %d", gd_op_list[op], peer_cnt, ret);
+
+out:
+        return ret;
+}
+
+int32_t
+glusterd_mgmt_v3_initiate_all_phases (rpcsvc_request_t *req, glusterd_op_t op,
+                                      dict_t *dict)
+{
+        int32_t                     ret              = -1;
+        int32_t                     op_ret           = -1;
+        int32_t                     npeers           = 0;
+        dict_t                      *req_dict        = NULL;
+        dict_t                      *tmp_dict        = NULL;
+        glusterd_conf_t             *conf            = NULL;
+        char                        *op_errstr       = NULL;
+        xlator_t                    *this            = NULL;
+        gf_boolean_t                is_acquired      = _gf_false;
+        uuid_t                      *originator_uuid = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (req);
+        GF_ASSERT (dict);
+        conf = this->private;
+        GF_ASSERT (conf);
+
+        /* Save the MY_UUID as the originator_uuid. This originator_uuid
+         * will be used by is_origin_glusterd() to determine if a node
+         * is the originator node for a command. */
+        originator_uuid = GF_CALLOC (1, sizeof(uuid_t),
+                                     gf_common_mt_uuid_t);
+        if (!originator_uuid) {
+                ret = -1;
+                goto out;
+        }
+
+        uuid_copy (*originator_uuid, MY_UUID);
+        ret = dict_set_bin (dict, "originator_uuid",
+                            originator_uuid, sizeof (uuid_t));
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Failed to set originator_uuid.");
+                goto out;
+        }
+
+        /* Marking the operation as complete synctasked */
+        ret = dict_set_int32 (dict, "is_synctasked", _gf_true);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Failed to set synctasked flag.");
+                goto out;
+        }
+
+        /* Use a copy at local unlock as cli response will be sent before
+         * the unlock and the volname in the dict might be removed */
+        tmp_dict = dict_new();
+        if (!tmp_dict) {
+                gf_log (this->name, GF_LOG_ERROR, "Unable to create dict");
+                goto out;
+        }
+        dict_copy (dict, tmp_dict);
+
+        /* BUILD PEERS LIST */
+        INIT_LIST_HEAD (&conf->xaction_peers);
+        npeers = gd_build_peers_list  (&conf->peers, &conf->xaction_peers, op);
+
+        /* LOCKDOWN PHASE - Acquire mgmt_v3 locks */
+        ret = glusterd_mgmt_v3_initiate_lockdown (conf, op, dict, &op_errstr,
+                                                  npeers, &is_acquired);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "mgmt_v3 lockdown failed.");
+                goto out;
+        }
+
+        /* BUILD PAYLOAD */
+        ret = glusterd_mgmt_v3_build_payload (&req_dict, &op_errstr, dict, op);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, LOGSTR_BUILD_PAYLOAD,
+                        gd_op_list[op]);
+                if (op_errstr == NULL)
+                        gf_asprintf (&op_errstr, OPERRSTR_BUILD_PAYLOAD);
+                goto out;
+        }
+
+        /* PRE-COMMIT VALIDATE PHASE */
+        ret = glusterd_mgmt_v3_pre_validate (conf, op, req_dict,
+                                             &op_errstr, npeers);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Pre Validation Failed");
+                goto out;
+        }
+
+        /* COMMIT OP PHASE */
+        ret = glusterd_mgmt_v3_commit (conf, op, dict, req_dict,
+                                       &op_errstr, npeers);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Commit Op Failed");
+                goto out;
+        }
+
+        /* POST-COMMIT VALIDATE PHASE */
+        /* As of now, post_validate is not handling any other
+           commands other than snapshot. So as of now, I am
+           sending 0 (op_ret as 0).
+        */
+        ret = glusterd_mgmt_v3_post_validate (conf, op, 0, dict, req_dict,
+                                              &op_errstr, npeers);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Post Validation Failed");
+                goto out;
+        }
+
+        ret = 0;
+out:
+        op_ret = ret;
+        /* UNLOCK PHASE FOR PEERS*/
+        (void) glusterd_mgmt_v3_release_peer_locks (conf, op, dict,
+                                                    op_ret, &op_errstr,
+                                                    npeers, is_acquired);
+
+        /* LOCAL VOLUME(S) UNLOCK */
+        if (is_acquired) {
+                /* Trying to release multiple mgmt_v3 locks */
+                ret = glusterd_multiple_mgmt_v3_unlock (tmp_dict, MY_UUID);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Failed to release mgmt_v3 locks on localhost");
+                        op_ret = ret;
+                }
+        }
+
+        /* SEND CLI RESPONSE */
+        glusterd_op_send_cli_response (op, op_ret, 0, req, dict, op_errstr);
+
+        if (req_dict)
+                dict_unref (req_dict);
+
+        if (tmp_dict)
+                dict_unref (tmp_dict);
+
+        if (op_errstr) {
+                GF_FREE (op_errstr);
+                op_errstr = NULL;
+        }
+
+        return 0;
+}
+
+int32_t
+glusterd_mgmt_v3_initiate_snap_phases (rpcsvc_request_t *req, glusterd_op_t op,
+                                       dict_t *dict)
+{
+        int32_t                     ret              = -1;
+        int32_t                     op_ret           = -1;
+        int32_t                     npeers           = 0;
+        dict_t                      *req_dict        = NULL;
+        dict_t                      *tmp_dict        = NULL;
+        glusterd_conf_t             *conf            = NULL;
+        char                        *op_errstr       = NULL;
+        xlator_t                    *this            = NULL;
+        gf_boolean_t                is_acquired      = _gf_false;
+        uuid_t                      *originator_uuid = NULL;
+        gf_boolean_t                success          = _gf_false;
+        char                        *tmp_errstr      = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (req);
+        GF_ASSERT (dict);
+        conf = this->private;
+        GF_ASSERT (conf);
+
+        /* Save the MY_UUID as the originator_uuid. This originator_uuid
+         * will be used by is_origin_glusterd() to determine if a node
+         * is the originator node for a command. */
+        originator_uuid = GF_CALLOC (1, sizeof(uuid_t),
+                                     gf_common_mt_uuid_t);
+        if (!originator_uuid) {
+                ret = -1;
+                goto out;
+        }
+
+        uuid_copy (*originator_uuid, MY_UUID);
+        ret = dict_set_bin (dict, "originator_uuid",
+                            originator_uuid, sizeof (uuid_t));
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Failed to set originator_uuid.");
+                goto out;
+        }
+
+        /* Marking the operation as complete synctasked */
+        ret = dict_set_int32 (dict, "is_synctasked", _gf_true);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Failed to set synctasked flag.");
+                goto out;
+        }
+
+        /* Use a copy at local unlock as cli response will be sent before
+         * the unlock and the volname in the dict might be removed */
+        tmp_dict = dict_new();
+        if (!tmp_dict) {
+                gf_log (this->name, GF_LOG_ERROR, "Unable to create dict");
+                goto out;
+        }
+        dict_copy (dict, tmp_dict);
+
+        /* BUILD PEERS LIST */
+        INIT_LIST_HEAD (&conf->xaction_peers);
+        npeers = gd_build_peers_list  (&conf->peers, &conf->xaction_peers, op);
+
+        /* LOCKDOWN PHASE - Acquire mgmt_v3 locks */
+        ret = glusterd_mgmt_v3_initiate_lockdown (conf, op, dict, &op_errstr,
+                                                  npeers, &is_acquired);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "mgmt_v3 lockdown failed.");
+                goto out;
+        }
+
+        /* BUILD PAYLOAD */
+        ret = glusterd_mgmt_v3_build_payload (&req_dict, &op_errstr, dict, op);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, LOGSTR_BUILD_PAYLOAD,
+                        gd_op_list[op]);
+                if (op_errstr == NULL)
+                        gf_asprintf (&op_errstr, OPERRSTR_BUILD_PAYLOAD);
+                goto out;
+        }
+
+        /* PRE-COMMIT VALIDATE PHASE */
+        ret = glusterd_mgmt_v3_pre_validate (conf, op, req_dict,
+                                            &op_errstr, npeers);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Pre Validation Failed");
+                goto out;
+        }
+
+        /* BRICK OP PHASE for initiating barrier*/
+        ret = dict_set_int32 (req_dict, "barrier", 1);
+        if (ret)
+                goto out;
+        ret = glusterd_mgmt_v3_brick_op (conf, op, req_dict,
+                                        &op_errstr, npeers);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Brick Ops Failed");
+                goto unbarrier;
+        }
+
+        /* COMMIT OP PHASE */
+        /* TODO: As of now, the plan is to do quorum check before sending the
+           commit fop and if the quorum succeeds, then commit is sent to all
+           the other glusterds.
+           snap create functionality now creates the in memory and on disk
+           objects for the snapshot (marking them as incomplete), takes the lvm
+           snapshot and then updates the status of the in memory and on disk
+           snap objects as complete. Suppose one of the glusterds goes down
+           after taking the lvm snapshot, but before updating the snap object,
+           then treat it as a snapshot create failure and trigger cleanup.
+           i.e the number of commit responses received by the originator
+           glusterd shold be the same as the number of peers it has sent the
+           request to (i.e npeers variable). If not, then originator glusterd
+           will initiate cleanup in post-validate fop.
+           Question: What if one of the other glusterds goes down as explained
+           above and along with it the originator glusterd also goes down?
+           Who will initiate the cleanup?
+        */
+        ret = glusterd_mgmt_v3_commit (conf, op, dict, req_dict,
+                                       &op_errstr, npeers);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Commit Op Failed");
+                /* If the main op fails, we should save the error string.
+                   Because, op_errstr will be used for unbarrier and
+                   unlock ops also. We might lose the actual error that
+                   caused the failure.
+                */
+                tmp_errstr = op_errstr;
+                op_errstr = NULL;
+                goto unbarrier;
+        }
+
+        success = _gf_true;
+unbarrier:
+        /* BRICK OP PHASE for removing the barrier*/
+        ret = dict_set_int32 (req_dict, "barrier", 0);
+        if (ret)
+                goto out;
+        ret = glusterd_mgmt_v3_brick_op (conf, op, req_dict,
+                                         &op_errstr, npeers);
+
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Brick Ops Failed");
+                goto out;
+        }
+
+        ret = 0;
+
+out:
+        op_ret = ret;
+
+        if (success == _gf_false)
+                op_ret = -1;
+
+        /* POST-COMMIT VALIDATE PHASE */
+        ret = glusterd_mgmt_v3_post_validate (conf, op, op_ret, dict, req_dict,
+                                              &op_errstr, npeers);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Post Validation Failed");
+                op_ret = -1;
+        }
+
+        /* UNLOCK PHASE FOR PEERS*/
+        (void) glusterd_mgmt_v3_release_peer_locks (conf, op, dict,
+                                                    op_ret, &op_errstr,
+                                                    npeers, is_acquired);
+
+        /* If the commit op (snapshot taking) failed, then the error is stored
+           in tmp_errstr and unbarrier is called. Suppose, if unbarrier also
+           fails, then the error happened in unbarrier is logged and freed.
+           The error happened in commit op, which is stored in tmp_errstr
+           is sent to cli.
+        */
+        if (tmp_errstr) {
+                if (op_errstr) {
+                        gf_log (this->name, GF_LOG_ERROR, "unbarrier brick op"
+                                "failed with the error %s", op_errstr);
+                        GF_FREE (op_errstr);
+                        op_errstr = NULL;
+                }
+                op_errstr = tmp_errstr;
+        }
+
+        /* LOCAL VOLUME(S) UNLOCK */
+        if (is_acquired) {
+                /* Trying to release multiple mgmt_v3 locks */
+                ret = glusterd_multiple_mgmt_v3_unlock (tmp_dict, MY_UUID);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Failed to release mgmt_v3 locks on localhost");
+                        op_ret = ret;
+                }
+        }
+
+        /* SEND CLI RESPONSE */
+        glusterd_op_send_cli_response (op, op_ret, 0, req, dict, op_errstr);
+
+        if (req_dict)
+                dict_unref (req_dict);
+
+        if (tmp_dict)
+                dict_unref (tmp_dict);
+
+        if (op_errstr) {
+                GF_FREE (op_errstr);
+                op_errstr = NULL;
+        }
+
+        return 0;
+}
diff --git a/xlators/mgmt/glusterd/src/glusterd-mgmt.h b/xlators/mgmt/glusterd/src/glusterd-mgmt.h
new file mode 100644
index 000000000..b185a9bec
--- /dev/null
+++ b/xlators/mgmt/glusterd/src/glusterd-mgmt.h
@@ -0,0 +1,45 @@
+/*
+   Copyright (c) 2013-2014 Red Hat, Inc. <http://www.redhat.com>
+   This file is part of GlusterFS.
+
+   This file is licensed to you under your choice of the GNU Lesser
+   General Public License, version 3 or any later version (LGPLv3 or
+   later), or the GNU General Public License, version 2 (GPLv2), in all
+   cases as published by the Free Software Foundation.
+*/
+#ifndef _GLUSTERD_MGMT_H_
+#define _GLUSTERD_MGMT_H_
+
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+
+int32_t
+gd_mgmt_v3_pre_validate_fn (glusterd_op_t op, dict_t *dict,
+                           char **op_errstr, dict_t *rsp_dict);
+
+int32_t
+gd_mgmt_v3_brick_op_fn (glusterd_op_t op, dict_t *dict,
+                       char **op_errstr, dict_t *rsp_dict);
+
+int32_t
+gd_mgmt_v3_commit_fn (glusterd_op_t op, dict_t *dict,
+                     char **op_errstr, dict_t *rsp_dict);
+
+int32_t
+gd_mgmt_v3_post_validate_fn (glusterd_op_t op, int32_t op_ret, dict_t *dict,
+                            char **op_errstr, dict_t *rsp_dict);
+
+int32_t
+glusterd_mgmt_v3_initiate_all_phases (rpcsvc_request_t *req, glusterd_op_t op,
+                                     dict_t *dict);
+
+int32_t
+glusterd_mgmt_v3_initiate_snap_phases (rpcsvc_request_t *req, glusterd_op_t op,
+                                      dict_t *dict);
+
+int
+glusterd_snap_pre_validate_use_rsp_dict (dict_t *dst, dict_t *src);
+
+#endif /* _GLUSTERD_MGMT_H_ */
diff --git a/xlators/mgmt/glusterd/src/glusterd-op-sm.c b/xlators/mgmt/glusterd/src/glusterd-op-sm.c
index 4e4f0394d..1666f5e4d 100644
--- a/xlators/mgmt/glusterd/src/glusterd-op-sm.c
+++ b/xlators/mgmt/glusterd/src/glusterd-op-sm.c
@@ -37,6 +37,7 @@
 #include "glusterd-store.h"
 #include "glusterd-hooks.h"
 #include "glusterd-volgen.h"
+#include "glusterd-locks.h"
 #include "syscall.h"
 #include "cli1-xdr.h"
 #include "common-utils.h"
@@ -67,6 +68,165 @@
 static struct list_head gd_op_sm_queue;
 pthread_mutex_t       gd_op_sm_lock;
 glusterd_op_info_t    opinfo = {{0},};
+uuid_t                global_txn_id = {"\0"}; /* To be used in
+                                               * heterogeneous
+                                               * cluster with no
+                                               * transaction ids */
+
+static dict_t *txn_opinfo;
+
+struct txn_opinfo_object_ {
+        glusterd_op_info_t    opinfo;
+};
+typedef struct txn_opinfo_object_ txn_opinfo_obj;
+
+int32_t
+glusterd_txn_opinfo_dict_init ()
+{
+        int32_t ret = -1;
+
+        txn_opinfo = dict_new ();
+        if (!txn_opinfo) {
+                ret = -1;
+                goto out;
+        }
+
+        ret = 0;
+out:
+        return ret;
+}
+
+void
+glusterd_txn_opinfo_dict_fini ()
+{
+        if (txn_opinfo)
+                dict_destroy (txn_opinfo);
+}
+
+void
+glusterd_txn_opinfo_init (glusterd_op_info_t  *opinfo,
+                          glusterd_op_sm_state_info_t *state,
+                          glusterd_op_t *op,
+                          dict_t *op_ctx,
+                          rpcsvc_request_t *req)
+{
+        GF_ASSERT (opinfo);
+
+        if (state)
+                opinfo->state = *state;
+
+        if (op)
+                opinfo->op = *op;
+
+        opinfo->op_ctx = dict_ref(op_ctx);
+
+        if (req)
+                opinfo->req = req;
+
+        return;
+}
+
+int32_t
+glusterd_get_txn_opinfo (uuid_t *txn_id, glusterd_op_info_t  *opinfo)
+{
+        int32_t          ret         = -1;
+        txn_opinfo_obj  *opinfo_obj  = NULL;
+
+        if (!txn_id || !opinfo) {
+                gf_log ("", GF_LOG_ERROR,
+                        "Empty transaction id or opinfo received.");
+                ret = -1;
+                goto out;
+        }
+
+        ret = dict_get_bin(txn_opinfo, uuid_utoa (*txn_id),
+                           (void **) &opinfo_obj);
+        if (ret) {
+                gf_log ("", GF_LOG_ERROR,
+                        "Unable to get transaction opinfo");
+                goto out;
+        }
+
+        (*opinfo) = opinfo_obj->opinfo;
+
+        ret = 0;
+out:
+        gf_log ("", GF_LOG_DEBUG, "Returning %d", ret);
+        return ret;
+}
+
+int32_t
+glusterd_set_txn_opinfo (uuid_t *txn_id, glusterd_op_info_t  *opinfo)
+{
+        int32_t          ret        = -1;
+        txn_opinfo_obj  *opinfo_obj = NULL;
+
+        if (!txn_id) {
+                gf_log ("", GF_LOG_ERROR, "Empty transaction id received.");
+                ret = -1;
+                goto out;
+        }
+
+        ret = dict_get_bin(txn_opinfo, uuid_utoa (*txn_id),
+                           (void **) &opinfo_obj);
+        if (ret) {
+                opinfo_obj = GF_CALLOC (1, sizeof(txn_opinfo_obj),
+                                        gf_common_mt_txn_opinfo_obj_t);
+                if (!opinfo_obj) {
+                        ret = -1;
+                        goto out;
+                }
+
+                ret = dict_set_bin(txn_opinfo, uuid_utoa (*txn_id), opinfo_obj,
+                                   sizeof(txn_opinfo_obj));
+                if (ret) {
+                        gf_log ("", GF_LOG_ERROR,
+                                "Unable to set opinfo for transaction ID : %s",
+                                uuid_utoa (*txn_id));
+                        goto out;
+                }
+        }
+
+        opinfo_obj->opinfo = (*opinfo);
+
+        ret = 0;
+out:
+        if (ret)
+                if (opinfo_obj)
+                        GF_FREE (opinfo_obj);
+
+        gf_log ("", GF_LOG_DEBUG, "Returning %d", ret);
+        return ret;
+}
+
+int32_t
+glusterd_clear_txn_opinfo (uuid_t *txn_id)
+{
+        int32_t               ret         = -1;
+        glusterd_op_info_t    txn_op_info = {{0},};
+
+        if (!txn_id) {
+                gf_log ("", GF_LOG_ERROR, "Empty transaction id received.");
+                ret = -1;
+                goto out;
+        }
+
+        ret = glusterd_get_txn_opinfo (txn_id, &txn_op_info);
+        if (ret) {
+                gf_log ("", GF_LOG_ERROR, "Transaction opinfo not found");
+                goto out;
+        }
+
+        dict_unref (txn_op_info.op_ctx);
+
+        dict_del(txn_opinfo, uuid_utoa (*txn_id));
+
+        ret = 0;
+out:
+        gf_log ("", GF_LOG_DEBUG, "Returning %d", ret);
+        return ret;
+}
+
 static int glusterfs_port = GLUSTERD_DEFAULT_PORT;
 static char *glusterd_op_sm_state_names[] = {
         "Default",
@@ -147,10 +307,10 @@ glusterd_is_volume_started (glusterd_volinfo_t  *volinfo)
 }
 
 static int
-glusterd_op_sm_inject_all_acc ()
+glusterd_op_sm_inject_all_acc (uuid_t *txn_id)
 {
         int32_t                 ret = -1;
-        ret = glusterd_op_sm_inject_event (GD_OP_EVENT_ALL_ACC, NULL);
+        ret = glusterd_op_sm_inject_event (GD_OP_EVENT_ALL_ACC, txn_id, NULL);
         gf_log ("", GF_LOG_DEBUG, "Returning %d", ret);
         return ret;
 }
@@ -235,20 +395,20 @@ glusterd_brick_op_build_payload (glusterd_op_t op, glusterd_brickinfo_t *brickin
                 brick_req->name = gf_strdup (name);
 
                 break;
-
-#ifdef HAVE_BD_XLATOR
-        case GD_OP_BD_OP:
-        {
+        case GD_OP_SNAP:
                 brick_req = GF_CALLOC (1, sizeof (*brick_req),
                                        gf_gld_mt_mop_brick_req_t);
                 if (!brick_req)
                         goto out;
 
-                brick_req->op = GLUSTERD_BRICK_BD_OP;
-                brick_req->name = "";
-        }
+                brick_req->op = GLUSTERD_VOLUME_BARRIER_OP;
+                ret = dict_get_str (dict, "volname", &volname);
+                if (ret)
+                        goto out;
+                snprintf (name, 1024, "%s-server",volname);
+                brick_req->name = gf_strdup (name);
+
                 break;
-#endif
         default:
                 goto out;
         break;
@@ -416,11 +576,17 @@ glusterd_op_stage_set_volume (dict_t *dict, char **op_errstr)
         if (!val_dict)
                 goto out;
 
+        ret = dict_get_str (dict, "volname", &volname);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Unable to get volume name");
+                goto out;
+        }
+
         /* Check if we can support the required op-version
          * This check is not done on the originator glusterd. The originator
          * glusterd sets this value.
          */
-        origin_glusterd = is_origin_glusterd ();
+        origin_glusterd = is_origin_glusterd (dict);
 
         if (!origin_glusterd) {
                 /* Check for v3.3.x origin glusterd */
@@ -828,7 +994,7 @@ glusterd_op_stage_sync_volume (dict_t *dict, char **op_errstr)
                 goto out;
         }
 
-        if (glusterd_is_local_addr (hostname)) {
+        if (gf_is_local_addr (hostname)) {
                 //volname is not present in case of sync all
                 ret = dict_get_str (dict, "volname", &volname);
                 if (!ret) {
@@ -1101,14 +1267,17 @@ _delete_reconfig_opt (dict_t *this, char *key, data_t *value, void *data)
         GF_ASSERT (data);
         is_force = (int32_t*)data;
 
-        if (*is_force != 1 &&
-            (_gf_true == glusterd_check_voloption_flags (key,
-                                                         OPT_FLAG_FORCE))) {
+        if (*is_force != 1) {
+                if (_gf_true == glusterd_check_voloption_flags (key,
+                                                         OPT_FLAG_FORCE)) {
                 /* indicate to caller that we don't set the option
                  * due to being protected
                  */
-                *is_force = -1;
-                goto out;
+                        *is_force = *is_force | GD_OP_PROTECTED;
+                        goto out;
+                } else {
+                        *is_force = *is_force | GD_OP_UNPROTECTED;
+                }
         }
 
         gf_log ("", GF_LOG_DEBUG, "deleting dict with key=%s,value=%s",
@@ -1160,8 +1329,9 @@ glusterd_options_reset (glusterd_volinfo_t *volinfo, char *key,
                 _delete_reconfig_opt (volinfo->dict, key, value, is_force);
         }
 
-        ret = glusterd_create_volfiles_and_notify_services (volinfo);
+        gd_update_volume_op_versions (volinfo);
 
+        ret = glusterd_create_volfiles_and_notify_services (volinfo);
         if (ret) {
                 gf_log (this->name, GF_LOG_ERROR, "Unable to create volfile for"
                         " 'volume reset'");
@@ -1276,7 +1446,7 @@ out:
 }
 
 static int
-glusterd_op_reset_volume (dict_t *dict, char **op_errstr)
+glusterd_op_reset_volume (dict_t *dict, char **op_rspstr)
 {
         glusterd_volinfo_t      *volinfo    = NULL;
         int                     ret         = -1;
@@ -1331,10 +1501,18 @@ glusterd_op_reset_volume (dict_t *dict, char **op_errstr)
                 quorum_action = _gf_true;
 
         ret = glusterd_options_reset (volinfo, key, &is_force);
-        if (is_force == -1) {
-                ret = -1;
-                gf_asprintf(op_errstr, "'%s' is protected. To reset use 'force'.",
-                            key);
+        if (ret == -1) {
+                gf_asprintf(op_rspstr, "Volume reset : failed");
+        } else if (is_force & GD_OP_PROTECTED) {
+                if (is_force & GD_OP_UNPROTECTED) {
+                        gf_asprintf (op_rspstr, "All unprotected fields were"
+                                     " reset. To reset the protected fields,"
+                                     " use 'force'.");
+                } else {
+                        ret = -1;
+                        gf_asprintf (op_rspstr, "'%s' is protected. To reset"
+                                     " use 'force'.", key);
+                }
         }
 
 out:
@@ -1364,14 +1542,25 @@ glusterd_stop_bricks (glusterd_volinfo_t *volinfo)
 int
 glusterd_start_bricks (glusterd_volinfo_t *volinfo)
 {
-        glusterd_brickinfo_t                    *brickinfo = NULL;
+        int                      ret            = -1;
+        glusterd_brickinfo_t    *brickinfo      = NULL;
+
+        GF_ASSERT (volinfo);
 
         list_for_each_entry (brickinfo, &volinfo->bricks, brick_list) {
-                if (glusterd_brick_start (volinfo, brickinfo, _gf_false))
-                        return -1;
+                ret = glusterd_brick_start (volinfo, brickinfo, _gf_false);
+                if (ret) {
+                        gf_log (THIS->name, GF_LOG_ERROR,
+                                "Failed to start %s:%s for %s",
+                                brickinfo->hostname, brickinfo->path,
+                                volinfo->volname);
+                        goto out;
+                }
         }
 
-        return 0;
+        ret = 0;
+out:
+        return ret;
 }
 
 static int
@@ -1474,6 +1663,7 @@ glusterd_op_set_volume (dict_t *dict)
         char                                     str[50] = {0, };
         char                                    *op_errstr = NULL;
         gf_boolean_t                             global_opt    = _gf_false;
+        gf_boolean_t                             global_opts_set = _gf_false;
         glusterd_volinfo_t                      *voliter = NULL;
         int32_t                                  dict_count = 0;
         gf_boolean_t                             check_op_version = _gf_false;
@@ -1520,6 +1710,7 @@ glusterd_op_set_volume (dict_t *dict)
                 goto out;
         }
 
+        // TODO: Remove this once v3.3 compatability is not required
         check_op_version = dict_get_str_boolean (dict, "check-op-version",
                                                  _gf_false);
 
@@ -1534,7 +1725,6 @@ glusterd_op_set_volume (dict_t *dict)
 
         for (count = 1; ret != -1 ; count++) {
 
-                global_opt = _gf_false;
                 sprintf (str, "key%d", count);
                 ret = dict_get_str (dict, str, &key);
                 if (ret)
@@ -1582,8 +1772,11 @@ glusterd_op_set_volume (dict_t *dict)
                         }
                 }
 
-                if (glusterd_check_globaloption (key))
+                global_opt = _gf_false;
+                if (glusterd_check_globaloption (key)) {
                         global_opt = _gf_true;
+                        global_opts_set = _gf_true;
+                }
 
                 if (!global_opt)
                         value = gf_strdup (value);
@@ -1626,7 +1819,21 @@ glusterd_op_set_volume (dict_t *dict)
                 goto out;
         }
 
-        if (!global_opt) {
+        /* Update the cluster op-version before regenerating volfiles so that
+         * correct volfiles are generated
+         */
+        if (new_op_version > priv->op_version) {
+                priv->op_version = new_op_version;
+                ret = glusterd_store_global_info (this);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Failed to store op-version");
+                        goto out;
+                }
+        }
+
+        if (!global_opts_set) {
+                gd_update_volume_op_versions (volinfo);
                 ret = glusterd_create_volfiles_and_notify_services (volinfo);
                 if (ret) {
                         gf_log (this->name, GF_LOG_ERROR,
@@ -1652,6 +1859,7 @@ glusterd_op_set_volume (dict_t *dict)
         } else {
                 list_for_each_entry (voliter, &priv->volumes, vol_list) {
                         volinfo = voliter;
+                        gd_update_volume_op_versions (volinfo);
                         ret = glusterd_create_volfiles_and_notify_services (volinfo);
                         if (ret) {
                                 gf_log (this->name, GF_LOG_ERROR,
@@ -1677,16 +1885,6 @@ glusterd_op_set_volume (dict_t *dict)
                 }
         }
 
-        if (new_op_version > priv->op_version) {
-                priv->op_version = new_op_version;
-                ret = glusterd_store_global_info (this);
-                if (ret) {
-                        gf_log (this->name, GF_LOG_ERROR,
-                                "Failed to store op-version");
-                        goto out;
-                }
-        }
-
  out:
         GF_FREE (key_fixed);
         gf_log (this->name, GF_LOG_DEBUG, "returning %d", ret);
@@ -1723,7 +1921,7 @@ glusterd_op_sync_volume (dict_t *dict, char **op_errstr,
                 goto out;
         }
 
-        if (!glusterd_is_local_addr (hostname)) {
+        if (!gf_is_local_addr (hostname)) {
                 ret = 0;
                 goto out;
         }
@@ -1894,6 +2092,105 @@ out:
 }
 
 static int
+_add_brick_name_to_dict (dict_t *dict, char *key, glusterd_brickinfo_t *brick)
+{
+        int     ret = -1;
+        char    tmp[1024] = {0,};
+        char    *brickname = NULL;
+        xlator_t *this = NULL;
+
+        GF_ASSERT (dict);
+        GF_ASSERT (key);
+        GF_ASSERT (brick);
+
+        this = THIS;
+        GF_ASSERT (this);
+
+        snprintf (tmp, sizeof (tmp), "%s:%s", brick->hostname, brick->path);
+        brickname = gf_strdup (tmp);
+        if (!brickname) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to dup brick name");
+                goto out;
+        }
+
+        ret = dict_set_dynstr (dict, key, brickname);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Failed to add brick name to dict");
+                goto out;
+        }
+        brickname = NULL;
+out:
+        if (brickname)
+                GF_FREE (brickname);
+        return ret;
+}
+
+static int
+_add_remove_bricks_to_dict (dict_t *dict, glusterd_volinfo_t *volinfo,
+                            char *prefix)
+{
+        int             ret = -1;
+        int             count = 0;
+        int             i = 0;
+        char            brick_key[1024] = {0,};
+        char            dict_key[1024] ={0,};
+        char            *brick = NULL;
+        xlator_t        *this = NULL;
+
+        GF_ASSERT (dict);
+        GF_ASSERT (volinfo);
+        GF_ASSERT (prefix);
+
+        this = THIS;
+        GF_ASSERT (this);
+
+        ret = dict_get_int32 (volinfo->rebal.dict, "count", &count);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Failed to get brick count");
+                goto out;
+        }
+
+        snprintf (dict_key, sizeof (dict_key), "%s.count", prefix);
+        ret = dict_set_int32 (dict, dict_key, count);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Failed to set brick count in dict");
+                goto out;
+        }
+
+        for (i = 1; i <= count; i++) {
+                memset (brick_key, 0, sizeof (brick_key));
+                snprintf (brick_key, sizeof (brick_key), "brick%d", i);
+
+                ret = dict_get_str (volinfo->rebal.dict, brick_key, &brick);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Unable to get %s", brick_key);
+                        goto out;
+                }
+
+                memset (dict_key, 0, sizeof (dict_key));
+                snprintf (dict_key, sizeof (dict_key), "%s.%s", prefix,
+                          brick_key);
+                ret = dict_set_str (dict, dict_key, brick);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Failed to add brick to dict");
+                        goto out;
+                }
+                brick = NULL;
+        }
+
+out:
+        return ret;
+}
+
+/* This adds the respective task-id and all available parameters of a task into
+ * a dictionary
+ */
+static int
 _add_task_to_dict (dict_t *dict, glusterd_volinfo_t *volinfo, int op, int index)
 {
 
@@ -1910,13 +2207,34 @@ _add_task_to_dict (dict_t *dict, glusterd_volinfo_t *volinfo, int op, int index)
         GF_ASSERT (this);
 
         switch (op) {
-        case GD_OP_REBALANCE:
         case GD_OP_REMOVE_BRICK:
+                snprintf (key, sizeof (key), "task%d", index);
+                ret = _add_remove_bricks_to_dict (dict, volinfo, key);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Failed to add remove bricks to dict");
+                        goto out;
+                }
+        case GD_OP_REBALANCE:
                 uuid_str = gf_strdup (uuid_utoa (volinfo->rebal.rebalance_id));
                 status = volinfo->rebal.defrag_status;
                 break;
 
         case GD_OP_REPLACE_BRICK:
+                snprintf (key, sizeof (key), "task%d.src-brick", index);
+                ret = _add_brick_name_to_dict (dict, key,
+                                               volinfo->rep_brick.src_brick);
+                if (ret)
+                        goto out;
+                memset (key, 0, sizeof (key));
+
+                snprintf (key, sizeof (key), "task%d.dst-brick", index);
+                ret = _add_brick_name_to_dict (dict, key,
+                                               volinfo->rep_brick.dst_brick);
+                if (ret)
+                        goto out;
+                memset (key, 0, sizeof (key));
+
                 uuid_str = gf_strdup (uuid_utoa (volinfo->rep_brick.rb_id));
                 status = volinfo->rep_brick.rb_status;
                 break;
@@ -1929,8 +2247,7 @@ _add_task_to_dict (dict_t *dict, glusterd_volinfo_t *volinfo, int op, int index)
         }
 
         snprintf (key, sizeof (key), "task%d.type", index);
-        ret = dict_set_str (dict, key,
-                            (char *)gd_op_list[op]);
+        ret = dict_set_str (dict, key, (char *)gd_op_list[op]);
         if (ret) {
                 gf_log (this->name, GF_LOG_ERROR,
                         "Error setting task type in dict");
@@ -1940,7 +2257,6 @@ _add_task_to_dict (dict_t *dict, glusterd_volinfo_t *volinfo, int op, int index)
         memset (key, 0, sizeof (key));
         snprintf (key, sizeof (key), "task%d.id", index);
 
-
         if (!uuid_str)
                 goto out;
         ret = dict_set_dynstr (dict, key, uuid_str);
@@ -1967,6 +2283,50 @@ out:
 }
 
 static int
+glusterd_aggregate_task_status (dict_t *rsp_dict, glusterd_volinfo_t *volinfo)
+{
+        int        ret   = -1;
+        int        tasks = 0;
+        xlator_t  *this  = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+
+        if (!uuid_is_null (volinfo->rebal.rebalance_id)) {
+                ret = _add_task_to_dict (rsp_dict, volinfo, volinfo->rebal.op,
+                                         tasks);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Failed to add task details to dict");
+                        goto out;
+                }
+                tasks++;
+        }
+
+        if (!uuid_is_null (volinfo->rep_brick.rb_id)) {
+                ret = _add_task_to_dict (rsp_dict, volinfo, GD_OP_REPLACE_BRICK,
+                                         tasks);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Failed to add task details to dict");
+                        goto out;
+                }
+                tasks++;
+        }
+
+        ret = dict_set_int32 (rsp_dict, "tasks", tasks);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Error setting tasks count in dict");
+                goto out;
+        }
+        ret = 0;
+
+out:
+        return ret;
+}
+
+static int
 glusterd_op_status_volume (dict_t *dict, char **op_errstr,
                            dict_t *rsp_dict)
 {
@@ -1986,7 +2346,6 @@ glusterd_op_status_volume (dict_t *dict, char **op_errstr,
         gf_boolean_t            nfs_disabled    = _gf_false;
         gf_boolean_t            shd_enabled     = _gf_true;
         gf_boolean_t            origin_glusterd = _gf_false;
-        int                     tasks           = 0;
 
         this = THIS;
         GF_ASSERT (this);
@@ -1996,13 +2355,13 @@ glusterd_op_status_volume (dict_t *dict, char **op_errstr,
 
         GF_ASSERT (dict);
 
-        origin_glusterd = is_origin_glusterd ();
+        origin_glusterd = is_origin_glusterd (dict);
 
         ret = dict_get_uint32 (dict, "cmd", &cmd);
         if (ret)
                 goto out;
 
-        if (is_origin_glusterd ()) {
+        if (origin_glusterd) {
                 ret = 0;
                 if ((cmd & GF_CLI_STATUS_ALL)) {
                         ret = glusterd_get_all_volnames (rsp_dict);
@@ -2069,6 +2428,10 @@ glusterd_op_status_volume (dict_t *dict, char **op_errstr,
                                                            brick_index);
                 node_count++;
 
+        } else if ((cmd & GF_CLI_STATUS_TASKS) != 0) {
+                ret = glusterd_aggregate_task_status (rsp_dict, volinfo);
+                goto out;
+
         } else {
                 list_for_each_entry (brickinfo, &volinfo->bricks, brick_list) {
                         brick_index++;
@@ -2142,35 +2505,18 @@ glusterd_op_status_volume (dict_t *dict, char **op_errstr,
         }
 
         /* Active tasks */
+        /* Tasks are added only for normal volume status request for either a
+         * single volume or all volumes, and only by the origin glusterd
+         */
         if (((cmd & GF_CLI_STATUS_MASK) != GF_CLI_STATUS_NONE) ||
+            !(cmd & (GF_CLI_STATUS_VOL | GF_CLI_STATUS_ALL)) ||
             !origin_glusterd)
                 goto out;
 
-        if (!uuid_is_null (volinfo->rebal.rebalance_id)) {
-                ret = _add_task_to_dict (rsp_dict, volinfo, volinfo->rebal.op,
-                                         tasks);
-                if (ret) {
-                        gf_log (this->name, GF_LOG_ERROR,
-                                "Failed to add task details to dict");
-                        goto out;
-                }
-                tasks++;
-        }
-        if (!uuid_is_null (volinfo->rep_brick.rb_id)) {
-                ret = _add_task_to_dict (rsp_dict, volinfo, GD_OP_REPLACE_BRICK,
-                                         tasks);
-                if (ret) {
-                        gf_log (this->name, GF_LOG_ERROR,
-                                "Failed to add task details to dict");
-                        goto out;
-                }
-                tasks++;
-        }
-
-        ret = dict_set_int32 (rsp_dict, "tasks", tasks);
+        ret = glusterd_aggregate_task_status (rsp_dict, volinfo);
         if (ret)
-                gf_log (this->name, GF_LOG_ERROR,
-                        "Error setting tasks count in dict");
+                goto out;
+        ret = 0;
 
 out:
         gf_log (this->name, GF_LOG_DEBUG, "Returning %d", ret);
@@ -2197,6 +2543,7 @@ glusterd_op_ac_send_lock (glusterd_op_sm_event_t *event, void *ctx)
         xlator_t             *this     = NULL;
         glusterd_peerinfo_t  *peerinfo = NULL;
         uint32_t             pending_count = 0;
+        dict_t               *dict     = NULL;
 
         this = THIS;
         priv = this->private;
@@ -2211,27 +2558,60 @@ glusterd_op_ac_send_lock (glusterd_op_sm_event_t *event, void *ctx)
                     (glusterd_op_get_op() != GD_OP_SYNC_VOLUME))
                         continue;
 
-                proc = &peerinfo->mgmt->proctable[GLUSTERD_MGMT_CLUSTER_LOCK];
-                if (proc->fn) {
-                        ret = proc->fn (NULL, this, peerinfo);
-                        if (ret) {
-                                gf_log (this->name, GF_LOG_WARNING, "Failed to "
-                                        "send lock request for operation "
-                                        "'Volume %s' to peer %s",
-                                        gd_op_list[opinfo.op],
-                                        peerinfo->hostname);
-                                continue;
+                /* Based on the op_version, acquire a cluster or mgmt_v3 lock */
+                if (priv->op_version < 3) {
+                        proc = &peerinfo->mgmt->proctable[GLUSTERD_MGMT_CLUSTER_LOCK];
+                        if (proc->fn) {
+                                ret = proc->fn (NULL, this, peerinfo);
+                                if (ret) {
+                                        gf_log (this->name, GF_LOG_WARNING,
+                                                "Failed to send lock request "
+                                                "for operation 'Volume %s' to "
+                                                "peer %s",
+                                                gd_op_list[opinfo.op],
+                                                peerinfo->hostname);
+                                        continue;
+                                }
+                                pending_count++;
+                        }
+                } else {
+                        dict = glusterd_op_get_ctx ();
+                        dict_ref (dict);
+
+                        proc = &peerinfo->mgmt_v3->proctable
+                                                   [GLUSTERD_MGMT_V3_LOCK];
+                        if (proc->fn) {
+                                ret = dict_set_static_ptr (dict, "peerinfo",
+                                                           peerinfo);
+                                if (ret) {
+                                        gf_log (this->name, GF_LOG_ERROR,
+                                                "failed to set peerinfo");
+                                        dict_unref (dict);
+                                        goto out;
+                                }
+
+                                ret = proc->fn (NULL, this, dict);
+                                if (ret) {
+                                        gf_log (this->name, GF_LOG_WARNING,
+                                                "Failed to send mgmt_v3 lock "
+                                                "request for operation "
+                                                "'Volume %s' to peer %s",
+                                                gd_op_list[opinfo.op],
+                                                peerinfo->hostname);
+                                        dict_unref (dict);
+                                        continue;
+                                }
+                                pending_count++;
                         }
-                        pending_count++;
                 }
         }
 
         opinfo.pending_count = pending_count;
         if (!opinfo.pending_count)
-                ret = glusterd_op_sm_inject_all_acc ();
+                ret = glusterd_op_sm_inject_all_acc (&event->txn_id);
 
+out:
         gf_log (this->name, GF_LOG_DEBUG, "Returning with %d", ret);
-
         return ret;
 }
 
@@ -2244,17 +2624,12 @@ glusterd_op_ac_send_unlock (glusterd_op_sm_event_t *event, void *ctx)
         xlator_t             *this     = NULL;
         glusterd_peerinfo_t  *peerinfo = NULL;
         uint32_t             pending_count = 0;
+        dict_t               *dict     = NULL;
 
         this = THIS;
         priv = this->private;
         GF_ASSERT (priv);
 
-        /*ret = glusterd_unlock (MY_UUID);
-
-        if (ret)
-                goto out;
-        */
-
         list_for_each_entry (peerinfo, &priv->peers, uuid_list) {
                 GF_ASSERT (peerinfo);
 
@@ -2264,29 +2639,62 @@ glusterd_op_ac_send_unlock (glusterd_op_sm_event_t *event, void *ctx)
                     (glusterd_op_get_op() != GD_OP_SYNC_VOLUME))
                         continue;
 
-                proc = &peerinfo->mgmt->proctable[GLUSTERD_MGMT_CLUSTER_UNLOCK];
-                if (proc->fn) {
-                        ret = proc->fn (NULL, this, peerinfo);
-                        if (ret) {
-                                gf_log (this->name, GF_LOG_WARNING, "Failed to "
-                                        "send unlock request for operation "
-                                        "'Volume %s' to peer %s",
-                                        gd_op_list[opinfo.op],
-                                        peerinfo->hostname);
-                                continue;
+                /* Based on the op_version, release the *
+                 * cluster or mgmt_v3 lock */
+                if (priv->op_version < 3) {
+                        proc = &peerinfo->mgmt->proctable[GLUSTERD_MGMT_CLUSTER_UNLOCK];
+                        if (proc->fn) {
+                                ret = proc->fn (NULL, this, peerinfo);
+                                if (ret) {
+                                        gf_log (this->name, GF_LOG_WARNING,
+                                                "Failed to send unlock request "
+                                                "for operation 'Volume %s' to "
+                                                "peer %s",
+                                                gd_op_list[opinfo.op],
+                                                peerinfo->hostname);
+                                        continue;
+                                }
+                                pending_count++;
+                        }
+                } else {
+                        dict = glusterd_op_get_ctx ();
+                        dict_ref (dict);
+
+                        proc = &peerinfo->mgmt_v3->proctable
+                                                   [GLUSTERD_MGMT_V3_UNLOCK];
+                        if (proc->fn) {
+                                ret = dict_set_static_ptr (dict, "peerinfo",
+                                                           peerinfo);
+                                if (ret) {
+                                        gf_log (this->name, GF_LOG_ERROR,
+                                                "failed to set peerinfo");
+                                        dict_unref (dict);
+                                        goto out;
+                                }
+
+                                ret = proc->fn (NULL, this, dict);
+                                if (ret) {
+                                        gf_log (this->name, GF_LOG_WARNING,
+                                                "Failed to send mgmt_v3 unlock "
+                                                "request for operation "
+                                                "'Volume %s' to peer %s",
+                                                gd_op_list[opinfo.op],
+                                                peerinfo->hostname);
+                                        dict_unref (dict);
+                                        continue;
+                                }
+                                pending_count++;
                         }
-                        pending_count++;
                 }
         }
 
         opinfo.pending_count = pending_count;
         if (!opinfo.pending_count)
-                ret = glusterd_op_sm_inject_all_acc ();
+                ret = glusterd_op_sm_inject_all_acc (&event->txn_id);
 
+out:
         gf_log (this->name, GF_LOG_DEBUG, "Returning with %d", ret);
-
         return ret;
-
 }
 
 static int
@@ -2298,7 +2706,8 @@ glusterd_op_ac_ack_drain (glusterd_op_sm_event_t *event, void *ctx)
                 opinfo.pending_count--;
 
         if (!opinfo.pending_count)
-                ret = glusterd_op_sm_inject_event (GD_OP_EVENT_ALL_ACK, NULL);
+                ret = glusterd_op_sm_inject_event (GD_OP_EVENT_ALL_ACK,
+                                                   &event->txn_id, NULL);
 
         gf_log (THIS->name, GF_LOG_DEBUG, "Returning with %d", ret);
 
@@ -2314,43 +2723,94 @@ glusterd_op_ac_send_unlock_drain (glusterd_op_sm_event_t *event, void *ctx)
 static int
 glusterd_op_ac_lock (glusterd_op_sm_event_t *event, void *ctx)
 {
-        glusterd_op_lock_ctx_t   *lock_ctx = NULL;
-        int32_t                  ret = 0;
+        int32_t                         ret             = 0;
+        char                           *volname         = NULL;
+        glusterd_op_lock_ctx_t         *lock_ctx        = NULL;
+        glusterd_conf_t                *priv            = NULL;
+        xlator_t                       *this            = NULL;
 
         GF_ASSERT (event);
         GF_ASSERT (ctx);
 
+        this = THIS;
+        priv = this->private;
+
         lock_ctx = (glusterd_op_lock_ctx_t *)ctx;
 
-        ret = glusterd_lock (lock_ctx->uuid);
+        /* If the req came from a node running on older op_version
+         * the dict won't be present. Based on it acquiring a cluster
+         * or mgmt_v3 lock */
+        if (lock_ctx->dict == NULL) {
+                ret = glusterd_lock (lock_ctx->uuid);
+                glusterd_op_lock_send_resp (lock_ctx->req, ret);
+        } else {
+                ret = dict_get_str (lock_ctx->dict, "volname", &volname);
+                if (ret)
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Unable to acquire volname");
+                else {
+                        ret = glusterd_mgmt_v3_lock (volname, lock_ctx->uuid,
+                                                     "vol");
+                        if (ret)
+                                gf_log (this->name, GF_LOG_ERROR,
+                                        "Unable to acquire lock for %s",
+                                        volname);
+                }
 
-        gf_log (THIS->name, GF_LOG_DEBUG, "Lock Returned %d", ret);
+                glusterd_op_mgmt_v3_lock_send_resp (lock_ctx->req,
+                                                    &event->txn_id, ret);
 
-        glusterd_op_lock_send_resp (lock_ctx->req, ret);
+                dict_unref (lock_ctx->dict);
+        }
 
+        gf_log (THIS->name, GF_LOG_DEBUG, "Lock Returned %d", ret);
         return ret;
 }
 
 static int
 glusterd_op_ac_unlock (glusterd_op_sm_event_t *event, void *ctx)
 {
-        int                      ret = 0;
-        glusterd_op_lock_ctx_t   *lock_ctx = NULL;
-        xlator_t                 *this = NULL;
-        glusterd_conf_t          *priv = NULL;
+        int32_t                         ret             = 0;
+        char                           *volname         = NULL;
+        glusterd_op_lock_ctx_t         *lock_ctx        = NULL;
+        glusterd_conf_t                *priv            = NULL;
+        xlator_t                       *this            = NULL;
+
 
         GF_ASSERT (event);
         GF_ASSERT (ctx);
 
         this = THIS;
         priv = this->private;
+
         lock_ctx = (glusterd_op_lock_ctx_t *)ctx;
 
-        ret = glusterd_unlock (lock_ctx->uuid);
+        /* If the req came from a node running on older op_version
+         * the dict won't be present. Based on it releasing the cluster
+         * or mgmt_v3 lock */
+        if (lock_ctx->dict == NULL) {
+                ret = glusterd_unlock (lock_ctx->uuid);
+                glusterd_op_unlock_send_resp (lock_ctx->req, ret);
+        } else {
+                ret = dict_get_str (lock_ctx->dict, "volname", &volname);
+                if (ret)
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Unable to acquire volname");
+                else {
+                        ret = glusterd_mgmt_v3_unlock (volname, lock_ctx->uuid,
+                                                       "vol");
+                        if (ret)
+                                gf_log (this->name, GF_LOG_ERROR,
+                                        "Unable to release lock for %s", volname);
+                }
+
+                glusterd_op_mgmt_v3_unlock_send_resp (lock_ctx->req,
+                                                      &event->txn_id, ret);
 
-        gf_log (this->name, GF_LOG_DEBUG, "Unlock Returned %d", ret);
+                dict_unref (lock_ctx->dict);
+        }
 
-        glusterd_op_unlock_send_resp (lock_ctx->req, ret);
+        gf_log (this->name, GF_LOG_DEBUG, "Unlock Returned %d", ret);
 
         if (priv->pending_quorum_action)
                 glusterd_do_quorum_action ();
@@ -2388,7 +2848,8 @@ glusterd_op_ac_rcvd_lock_acc (glusterd_op_sm_event_t *event, void *ctx)
         if (opinfo.pending_count > 0)
                 goto out;
 
-        ret = glusterd_op_sm_inject_event (GD_OP_EVENT_ALL_ACC, NULL);
+        ret = glusterd_op_sm_inject_event (GD_OP_EVENT_ALL_ACC,
+                                           &event->txn_id, NULL);
 
         gf_log (THIS->name, GF_LOG_DEBUG, "Returning %d", ret);
 
@@ -2496,12 +2957,13 @@ glusterd_op_build_payload (dict_t **req, char **op_errstr, dict_t *op_ctx)
                         }
                         break;
 
+                case GD_OP_GSYNC_CREATE:
                 case GD_OP_GSYNC_SET:
                         {
                                 ret = glusterd_op_gsync_args_get (dict,
                                                                   &errstr,
                                                                   &volname,
-                                                                  NULL);
+                                                                  NULL, NULL);
                                 if (ret == 0) {
                                         ret = glusterd_dict_set_volid
                                                 (dict, volname, op_errstr);
@@ -2591,9 +3053,6 @@ glusterd_op_build_payload (dict_t **req, char **op_errstr, dict_t *op_ctx)
                 case GD_OP_STATEDUMP_VOLUME:
                 case GD_OP_CLEARLOCKS_VOLUME:
                 case GD_OP_DEFRAG_BRICK_VOLUME:
-#ifdef HAVE_BD_XLATOR
-                case GD_OP_BD_OP:
-#endif
                         {
                                 ret = dict_get_str (dict, "volname", &volname);
                                 if (ret) {
@@ -2614,6 +3073,18 @@ glusterd_op_build_payload (dict_t **req, char **op_errstr, dict_t *op_ctx)
                         }
                         break;
 
+                case GD_OP_COPY_FILE:
+                        {
+                                dict_copy (dict, req_dict);
+                                break;
+                        }
+
+                case GD_OP_SYS_EXEC:
+                        {
+                                dict_copy (dict, req_dict);
+                                break;
+                        }
+
                 default:
                         break;
         }
@@ -2810,7 +3281,8 @@ out:
         if (dict)
                 dict_unref (dict);
         if (ret) {
-                glusterd_op_sm_inject_event (GD_OP_EVENT_RCVD_RJT, NULL);
+                glusterd_op_sm_inject_event (GD_OP_EVENT_RCVD_RJT,
+                                             &event->txn_id, NULL);
                 opinfo.op_ret = ret;
         }
 
@@ -2819,7 +3291,7 @@ out:
                 opinfo.pending_count);
 
         if (!opinfo.pending_count)
-                ret = glusterd_op_sm_inject_all_acc ();
+                ret = glusterd_op_sm_inject_all_acc (&event->txn_id);
 
         gf_log (this->name, GF_LOG_DEBUG, "Returning with %d", ret);
 
@@ -2828,10 +3300,10 @@ out:
 }
 
 static int32_t
-glusterd_op_start_rb_timer (dict_t *dict)
+glusterd_op_start_rb_timer (dict_t *dict, uuid_t *txn_id)
 {
         int32_t         op = 0;
-        struct timeval  timeout = {0, };
+        struct timespec timeout = {0, };
         glusterd_conf_t *priv = NULL;
         int32_t         ret = -1;
         dict_t          *rb_ctx = NULL;
@@ -2847,12 +3319,12 @@ glusterd_op_start_rb_timer (dict_t *dict)
         }
 
         if (op != GF_REPLACE_OP_START) {
-                ret = glusterd_op_sm_inject_all_acc ();
+                ret = glusterd_op_sm_inject_all_acc (txn_id);
                 goto out;
         }
 
         timeout.tv_sec  = 5;
-        timeout.tv_usec = 0;
+        timeout.tv_nsec = 0;
 
 
         rb_ctx = dict_copy (dict, rb_ctx);
@@ -2862,6 +3334,17 @@ glusterd_op_start_rb_timer (dict_t *dict)
                 ret = -1;
                 goto out;
         }
+
+        ret = dict_set_bin (rb_ctx, "transaction_id",
+                            txn_id, sizeof(*txn_id));
+        if (ret) {
+                gf_log ("", GF_LOG_ERROR,
+                       "Failed to set transaction id.");
+                goto out;
+        } else
+               gf_log ("", GF_LOG_DEBUG,
+                        "transaction_id = %s", uuid_utoa (*txn_id));
+
         priv->timer = gf_timer_call_after (THIS->ctx, timeout,
                                            glusterd_do_replace_brick,
                                            (void *) rb_ctx);
@@ -2930,6 +3413,97 @@ out:
         return ret;
 }
 
+static int
+reassign_defrag_status (dict_t *dict, char *key, gf_defrag_status_t *status)
+{
+        int ret = 0;
+
+        if (!*status)
+                return ret;
+
+        switch (*status) {
+        case GF_DEFRAG_STATUS_STARTED:
+                *status = GF_DEFRAG_STATUS_LAYOUT_FIX_STARTED;
+                break;
+
+        case GF_DEFRAG_STATUS_STOPPED:
+                *status = GF_DEFRAG_STATUS_LAYOUT_FIX_STOPPED;
+                break;
+
+        case GF_DEFRAG_STATUS_COMPLETE:
+                *status = GF_DEFRAG_STATUS_LAYOUT_FIX_COMPLETE;
+                break;
+
+        case GF_DEFRAG_STATUS_FAILED:
+                *status = GF_DEFRAG_STATUS_LAYOUT_FIX_FAILED;
+                break;
+        default:
+                break;
+         }
+
+        ret = dict_set_int32(dict, key, *status);
+        if (ret)
+                gf_log (THIS->name, GF_LOG_WARNING,
+                        "failed to reset defrag %s in dict", key);
+
+        return ret;
+}
+
+/* Check and reassign the defrag_status enum got from the rebalance process
+ * of all peers so that the rebalance-status CLI command can display if a
+ * full-rebalance or just a fix-layout was carried out.
+ */
+static int
+glusterd_op_check_peer_defrag_status (dict_t *dict, int count)
+{
+        glusterd_volinfo_t *volinfo  = NULL;
+        gf_defrag_status_t status    = GF_DEFRAG_STATUS_NOT_STARTED;
+        char               key[256]  = {0,};
+        char               *volname  = NULL;
+        int                ret       = -1;
+        int                i         = 1;
+
+        ret = dict_get_str (dict, "volname", &volname);
+        if (ret) {
+                gf_log (THIS->name, GF_LOG_WARNING, "Unable to get volume name");
+                goto out;
+        }
+
+        ret = glusterd_volinfo_find (volname, &volinfo);
+        if (ret) {
+                gf_log (THIS->name, GF_LOG_WARNING, FMTSTR_CHECK_VOL_EXISTS,
+                        volname);
+                goto out;
+        }
+
+        if (volinfo->rebal.defrag_cmd != GF_DEFRAG_CMD_START_LAYOUT_FIX) {
+                /* Fix layout was not issued; we don't need to reassign
+                   the status */
+                ret = 0;
+                goto out;
+        }
+
+        do {
+                memset (key, 0, 256);
+                snprintf (key, 256, "status-%d", i);
+                ret = dict_get_int32 (dict, key, (int32_t *)&status);
+                if (ret) {
+                        gf_log (THIS->name, GF_LOG_WARNING,
+                                "failed to get defrag %s", key);
+                        goto out;
+                }
+                ret = reassign_defrag_status (dict, key, &status);
+                if (ret)
+                        goto out;
+                i++;
+        } while (i <= count);
+
+        ret = 0;
+out:
+        return ret;
+
+}
+
 /* This function is used to modify the op_ctx dict before sending it back
  * to cli. This is useful in situations like changing the peer uuids to
  * hostnames etc.
@@ -3033,12 +3607,38 @@ glusterd_op_modify_op_ctx (glusterd_op_t op, void *ctx)
                         goto out;
                 }
 
+                /* add 'node-name-%d' into op_ctx with value uuid_str.
+                   this will be used to convert to hostname later */
+                {
+                        char  key[1024];
+                        char *uuid_str = NULL;
+                        int   i;
+
+                        for (i = 1; i <= count; i++) {
+                                memset (key, 0, sizeof (key));
+                                snprintf (key, sizeof (key), "node-uuid-%d", i);
+                                ret = dict_get_str (op_ctx, key, &uuid_str);
+                                if (!ret) {
+                                        memset (key, 0, sizeof (key));
+                                        snprintf (key, sizeof (key),
+                                                  "node-name-%d", i);
+                                        ret = dict_set_str (op_ctx, key,
+                                                            uuid_str);
+                                }
+                        }
+                }
+
                 ret = glusterd_op_volume_dict_uuid_to_hostname (op_ctx,
-                                                                "node-uuid-%d",
+                                                                "node-name-%d",
                                                                 1, (count + 1));
                 if (ret)
                         gf_log (this->name, GF_LOG_WARNING,
                                 "Failed uuid to hostname conversion");
+
+                ret = glusterd_op_check_peer_defrag_status (op_ctx, count);
+                if (ret)
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Failed to reset defrag status for fix-layout");
                 break;
 
         default:
@@ -3191,17 +3791,19 @@ out:
         if (dict)
                 dict_unref (dict);
         if (ret) {
-                glusterd_op_sm_inject_event (GD_OP_EVENT_RCVD_RJT, NULL);
+                glusterd_op_sm_inject_event (GD_OP_EVENT_RCVD_RJT,
+                                             &event->txn_id, NULL);
                 opinfo.op_ret = ret;
         }
 
         if (!opinfo.pending_count) {
                 if (op == GD_OP_REPLACE_BRICK) {
-                        ret = glusterd_op_start_rb_timer (op_dict);
+                        ret = glusterd_op_start_rb_timer (op_dict,
+                                                          &event->txn_id);
 
                 } else {
                         glusterd_op_modify_op_ctx (op, NULL);
-                        ret = glusterd_op_sm_inject_all_acc ();
+                        ret = glusterd_op_sm_inject_all_acc (&event->txn_id);
                 }
                 goto err;
         }
@@ -3226,7 +3828,8 @@ glusterd_op_ac_rcvd_stage_op_acc (glusterd_op_sm_event_t *event, void *ctx)
         if (opinfo.pending_count > 0)
                 goto out;
 
-        ret = glusterd_op_sm_inject_event (GD_OP_EVENT_STAGE_ACC, NULL);
+        ret = glusterd_op_sm_inject_event (GD_OP_EVENT_STAGE_ACC,
+                                           &event->txn_id, NULL);
 
 out:
         gf_log (THIS->name, GF_LOG_DEBUG, "Returning %d", ret);
@@ -3247,7 +3850,8 @@ glusterd_op_ac_stage_op_failed (glusterd_op_sm_event_t *event, void *ctx)
         if (opinfo.pending_count > 0)
                 goto out;
 
-        ret = glusterd_op_sm_inject_event (GD_OP_EVENT_ALL_ACK, NULL);
+        ret = glusterd_op_sm_inject_event (GD_OP_EVENT_ALL_ACK,
+                                           &event->txn_id, NULL);
 
 out:
         gf_log (THIS->name, GF_LOG_DEBUG, "Returning %d", ret);
@@ -3268,7 +3872,8 @@ glusterd_op_ac_commit_op_failed (glusterd_op_sm_event_t *event, void *ctx)
         if (opinfo.pending_count > 0)
                 goto out;
 
-        ret = glusterd_op_sm_inject_event (GD_OP_EVENT_ALL_ACK, NULL);
+        ret = glusterd_op_sm_inject_event (GD_OP_EVENT_ALL_ACK,
+                                           &event->txn_id, NULL);
 
 out:
         gf_log (THIS->name, GF_LOG_DEBUG, "Returning %d", ret);
@@ -3311,7 +3916,8 @@ glusterd_op_ac_brick_op_failed (glusterd_op_sm_event_t *event, void *ctx)
         if (opinfo.brick_pending_count > 0)
                 goto out;
 
-        ret = glusterd_op_sm_inject_event (GD_OP_EVENT_ALL_ACK, ev_ctx->commit_ctx);
+        ret = glusterd_op_sm_inject_event (GD_OP_EVENT_ALL_ACK,
+                                           &event->txn_id, ev_ctx->commit_ctx);
 
 out:
         if (ev_ctx->rsp_dict)
@@ -3353,7 +3959,7 @@ glusterd_op_ac_rcvd_commit_op_acc (glusterd_op_sm_event_t *event, void *ctx)
                         goto out;
                 }
 
-                ret = glusterd_op_start_rb_timer (op_ctx);
+                ret = glusterd_op_start_rb_timer (op_ctx, &event->txn_id);
                 if (ret) {
                         gf_log (this->name, GF_LOG_ERROR, "Couldn't start "
                                 "replace-brick operation.");
@@ -3368,10 +3974,12 @@ glusterd_op_ac_rcvd_commit_op_acc (glusterd_op_sm_event_t *event, void *ctx)
 out:
         if (commit_ack_inject) {
                 if (ret)
-                        ret = glusterd_op_sm_inject_event (GD_OP_EVENT_RCVD_RJT, NULL);
+                        ret = glusterd_op_sm_inject_event (GD_OP_EVENT_RCVD_RJT,
+                                                           &event->txn_id, NULL);
                 else if (!opinfo.pending_count) {
                         glusterd_op_modify_op_ctx (op, NULL);
-                        ret = glusterd_op_sm_inject_event (GD_OP_EVENT_COMMIT_ACC, NULL);
+                        ret = glusterd_op_sm_inject_event (GD_OP_EVENT_COMMIT_ACC,
+                                                           &event->txn_id, NULL);
                 }
                 /*else do nothing*/
         }
@@ -3392,7 +4000,8 @@ glusterd_op_ac_rcvd_unlock_acc (glusterd_op_sm_event_t *event, void *ctx)
         if (opinfo.pending_count > 0)
                 goto out;
 
-        ret = glusterd_op_sm_inject_event (GD_OP_EVENT_ALL_ACC, NULL);
+        ret = glusterd_op_sm_inject_event (GD_OP_EVENT_ALL_ACC,
+                                           &event->txn_id, NULL);
 
         gf_log (THIS->name, GF_LOG_DEBUG, "Returning %d", ret);
 
@@ -3426,7 +4035,7 @@ glusterd_op_reset_ctx ()
 }
 
 int32_t
-glusterd_op_txn_complete ()
+glusterd_op_txn_complete (uuid_t *txn_id)
 {
         int32_t                 ret = -1;
         glusterd_conf_t         *priv = NULL;
@@ -3436,6 +4045,7 @@ glusterd_op_txn_complete ()
         rpcsvc_request_t        *req = NULL;
         void                    *ctx = NULL;
         char                    *op_errstr = NULL;
+        char                    *volname = NULL;
         xlator_t                *this = NULL;
 
         this = THIS;
@@ -3458,14 +4068,29 @@ glusterd_op_txn_complete ()
         glusterd_op_reset_ctx ();
         glusterd_op_clear_errstr ();
 
-        ret = glusterd_unlock (MY_UUID);
-
-        /* unlock cant/shouldnt fail here!! */
-        if (ret) {
-                gf_log (this->name, GF_LOG_CRITICAL,
-                        "Unable to clear local lock, ret: %d", ret);
+        /* Based on the op-version, we release the cluster or mgmt_v3 lock */
+        if (priv->op_version < 3) {
+                ret = glusterd_unlock (MY_UUID);
+                /* unlock cant/shouldnt fail here!! */
+                if (ret)
+                        gf_log (this->name, GF_LOG_CRITICAL,
+                                "Unable to clear local lock, ret: %d", ret);
+                else
+                        gf_log (this->name, GF_LOG_DEBUG, "Cleared local lock");
         } else {
-                gf_log (this->name, GF_LOG_DEBUG, "Cleared local lock");
+                ret = dict_get_str (ctx, "volname", &volname);
+                if (ret)
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Unable to acquire volname");
+
+                if (volname) {
+                        ret = glusterd_mgmt_v3_unlock (volname, MY_UUID,
+                                                       "vol");
+                        if (ret)
+                                gf_log (this->name, GF_LOG_ERROR,
+                                        "Unable to release lock for %s",
+                                        volname);
+                }
         }
 
         ret = glusterd_op_send_cli_response (op, op_ret,
@@ -3484,6 +4109,13 @@ glusterd_op_txn_complete ()
 
         if (priv->pending_quorum_action)
                 glusterd_do_quorum_action ();
+
+        /* Clearing the transaction opinfo */
+        ret = glusterd_clear_txn_opinfo (txn_id);
+        if (ret)
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Unable to clear transaction's opinfo");
+
         gf_log (this->name, GF_LOG_DEBUG, "Returning %d", ret);
         return ret;
 }
@@ -3495,7 +4127,7 @@ glusterd_op_ac_unlocked_all (glusterd_op_sm_event_t *event, void *ctx)
 
         GF_ASSERT (event);
 
-        ret = glusterd_op_txn_complete ();
+        ret = glusterd_op_txn_complete (&event->txn_id);
 
         gf_log (THIS->name, GF_LOG_DEBUG, "Returning %d", ret);
 
@@ -3512,6 +4144,7 @@ glusterd_op_ac_stage_op (glusterd_op_sm_event_t *event, void *ctx)
         char                    *op_errstr = NULL;
         dict_t                  *dict = NULL;
         xlator_t                *this = NULL;
+        uuid_t                  *txn_id = NULL;
 
         this = THIS;
         GF_ASSERT (this);
@@ -3537,6 +4170,19 @@ glusterd_op_ac_stage_op (glusterd_op_sm_event_t *event, void *ctx)
                         status);
         }
 
+        txn_id = GF_CALLOC (1, sizeof(uuid_t), gf_common_mt_uuid_t);
+
+        if (txn_id)
+                uuid_copy (*txn_id, event->txn_id);
+        else
+                gf_log (this->name, GF_LOG_ERROR, "Out of Memory");
+
+        ret = dict_set_bin (rsp_dict, "transaction_id",
+                            txn_id, sizeof(*txn_id));
+        if (ret)
+                gf_log (this->name, GF_LOG_ERROR,
+                       "Failed to set transaction id.");
+
         ret = glusterd_op_stage_send_resp (req_ctx->req, req_ctx->op,
                                            status, op_errstr, rsp_dict);
 
@@ -3601,6 +4247,7 @@ glusterd_op_ac_commit_op (glusterd_op_sm_event_t *event, void *ctx)
         dict_t                   *dict       = NULL;
         dict_t                   *rsp_dict   = NULL;
         xlator_t                 *this       = NULL;
+        uuid_t                   *txn_id     = NULL;
 
         this = THIS;
         GF_ASSERT (this);
@@ -3630,10 +4277,22 @@ glusterd_op_ac_commit_op (glusterd_op_sm_event_t *event, void *ctx)
                         "'Volume %s' failed: %d", gd_op_list[req_ctx->op],
                         status);
 
+        txn_id = GF_CALLOC (1, sizeof(uuid_t), gf_common_mt_uuid_t);
+
+        if (txn_id)
+                uuid_copy (*txn_id, event->txn_id);
+        else
+                gf_log (this->name, GF_LOG_ERROR, "Out of Memory");
+
+        ret = dict_set_bin (rsp_dict, "transaction_id",
+                            txn_id, sizeof(*txn_id));
+        if (ret)
+                gf_log (this->name, GF_LOG_ERROR,
+                       "Failed to set transaction id.");
+
         ret = glusterd_op_commit_send_resp (req_ctx->req, req_ctx->op,
                                             status, op_errstr, rsp_dict);
 
-        glusterd_op_fini_ctx ();
         if (op_errstr && (strcmp (op_errstr, "")))
                 GF_FREE (op_errstr);
 
@@ -3662,7 +4321,6 @@ glusterd_op_ac_send_commit_failed (glusterd_op_sm_event_t *event, void *ctx)
                                             opinfo.op_ret, opinfo.op_errstr,
                                             op_ctx);
 
-        glusterd_op_fini_ctx ();
         if (opinfo.op_errstr && (strcmp (opinfo.op_errstr, ""))) {
                 GF_FREE (opinfo.op_errstr);
                 opinfo.op_errstr = NULL;
@@ -3747,6 +4405,10 @@ glusterd_op_stage_validate (glusterd_op_t op, dict_t *dict, char **op_errstr,
                         ret = glusterd_op_stage_sync_volume (dict, op_errstr);
                         break;
 
+                case GD_OP_GSYNC_CREATE:
+                        ret = glusterd_op_stage_gsync_create (dict, op_errstr);
+                        break;
+
                 case GD_OP_GSYNC_SET:
                         ret = glusterd_op_stage_gsync_set (dict, op_errstr);
                         break;
@@ -3780,18 +4442,21 @@ glusterd_op_stage_validate (glusterd_op_t op, dict_t *dict, char **op_errstr,
                         ret = glusterd_op_stage_clearlocks_volume (dict,
                                                                    op_errstr);
                         break;
-#ifdef HAVE_BD_XLATOR
-                case GD_OP_BD_OP:
-                        ret = glusterd_op_stage_bd (dict, op_errstr);
+
+                case GD_OP_COPY_FILE:
+                        ret = glusterd_op_stage_copy_file (dict, op_errstr);
                         break;
-#endif
+
+                case GD_OP_SYS_EXEC:
+                        ret = glusterd_op_stage_sys_exec (dict, op_errstr);
+                        break;
+
                 default:
                         gf_log (this->name, GF_LOG_ERROR, "Unknown op %s",
                                 gd_op_list[op]);
         }
 
-        gf_log (this->name, GF_LOG_DEBUG, "Returning %d", ret);
-
+        gf_log (this->name, GF_LOG_DEBUG, "OP = %d. Returning %d", op, ret);
         return ret;
 }
 
@@ -3849,6 +4514,11 @@ glusterd_op_commit_perform (glusterd_op_t op, dict_t *dict, char **op_errstr,
                         ret = glusterd_op_sync_volume (dict, op_errstr, rsp_dict);
                         break;
 
+                case GD_OP_GSYNC_CREATE:
+                        ret = glusterd_op_gsync_create (dict, op_errstr,
+                                                        rsp_dict);
+                        break;
+
                 case GD_OP_GSYNC_SET:
                         ret = glusterd_op_gsync_set (dict, op_errstr, rsp_dict);
                         break;
@@ -3883,11 +4553,15 @@ glusterd_op_commit_perform (glusterd_op_t op, dict_t *dict, char **op_errstr,
                         ret = glusterd_op_clearlocks_volume (dict, op_errstr,
                                                              rsp_dict);
                         break;
-#ifdef HAVE_BD_XLATOR
-                case GD_OP_BD_OP:
-                        ret = 0;
+
+                case GD_OP_COPY_FILE:
+                        ret = glusterd_op_copy_file (dict, op_errstr);
                         break;
-#endif
+
+                case GD_OP_SYS_EXEC:
+                        ret = glusterd_op_sys_exec (dict, op_errstr, rsp_dict);
+                        break;
+
                 default:
                         gf_log (this->name, GF_LOG_ERROR, "Unknown op %s",
                                 gd_op_list[op]);
@@ -3896,11 +4570,12 @@ glusterd_op_commit_perform (glusterd_op_t op, dict_t *dict, char **op_errstr,
 
         if (ret == 0)
             glusterd_op_commit_hook (op, dict, GD_COMMIT_HOOK_POST);
-        gf_log (this->name, GF_LOG_DEBUG, "Returning %d", ret);
 
+        gf_log (this->name, GF_LOG_DEBUG, "Returning %d", ret);
         return ret;
 }
 
+
 static int
 glusterd_bricks_select_stop_volume (dict_t *dict, char **op_errstr,
                                     struct list_head *selected)
@@ -4217,24 +4892,95 @@ out:
 }
 
 int
+get_replica_index_for_per_replica_cmd (glusterd_volinfo_t *volinfo,
+                                       dict_t *dict) {
+        int                     ret = 0;
+        char                    *hostname = NULL;
+        char                    *path = NULL;
+        int                     index = 0;
+        glusterd_brickinfo_t   *brickinfo = NULL;
+        int                     cmd_replica_index = -1;
+        int                     replica_count = -1;
+
+
+        if (!dict)  {
+                ret = -1;
+                goto out;
+        }
+
+        ret = dict_get_str (dict, "per-replica-cmd-hostname", &hostname);
+        if (ret)
+                goto out;
+        ret = dict_get_str (dict, "per-replica-cmd-path", &path);
+        if (ret)
+                goto out;
+
+        replica_count = volinfo->replica_count;
+
+        list_for_each_entry (brickinfo, &volinfo->bricks, brick_list) {
+                if (uuid_is_null (brickinfo->uuid))
+                        (void)glusterd_resolve_brick (brickinfo);
+                if (!strcmp (brickinfo->path,  path) &&
+                    !strcmp (brickinfo->hostname, hostname)) {
+                        cmd_replica_index = index/(replica_count);
+                        goto out;
+                }
+                index++;
+        }
+
+
+out:
+        if (ret)
+                cmd_replica_index = -1;
+
+        return cmd_replica_index;
+}
+
+int
 _select_rxlators_with_local_bricks (xlator_t *this, glusterd_volinfo_t *volinfo,
-                                    dict_t *dict)
+                                    dict_t *dict, cli_cmd_type type)
 {
         glusterd_brickinfo_t    *brickinfo = NULL;
         glusterd_conf_t         *priv   = NULL;
-        int                     index = 1;
+        int                     index = 0;
         int                     rxlator_count = 0;
         int                     replica_count = 0;
         gf_boolean_t            add     = _gf_false;
+        int                     ret = 0;
+        int                     cmd_replica_index = -1;
 
         priv = this->private;
         replica_count = volinfo->replica_count;
+
+        if (type == PER_REPLICA) {
+
+                cmd_replica_index = get_replica_index_for_per_replica_cmd
+                                    (volinfo, dict);
+                if (cmd_replica_index == -1) {
+                        ret = -1;
+                        goto err;
+                }
+        }
+
+        index = 1;
+
         list_for_each_entry (brickinfo, &volinfo->bricks, brick_list) {
                 if (uuid_is_null (brickinfo->uuid))
                         (void)glusterd_resolve_brick (brickinfo);
 
-                if (!uuid_compare (MY_UUID, brickinfo->uuid))
-                        add = _gf_true;
+                switch (type) {
+                        case ALL_REPLICA:
+                                if (!uuid_compare (MY_UUID, brickinfo->uuid))
+                                        add = _gf_true;
+                                break;
+                        case PER_REPLICA:
+                                if (!uuid_compare (MY_UUID, brickinfo->uuid) &&
+                                 ((index-1)/replica_count == cmd_replica_index))
+
+                                                add = _gf_true;
+                                break;
+                }
+
                 if (index % replica_count == 0) {
                         if (add) {
                                 _add_rxlator_to_dict (dict, volinfo->volname,
@@ -4247,6 +4993,10 @@ _select_rxlators_with_local_bricks (xlator_t *this, glusterd_volinfo_t *volinfo,
 
                 index++;
         }
+err:
+        if (ret)
+                rxlator_count = -1;
+
         return rxlator_count;
 }
 
@@ -4287,9 +5037,10 @@ _select_rxlators_for_full_self_heal (xlator_t *this,
         return rxlator_count;
 }
 
-#ifdef HAVE_BD_XLATOR
+
 static int
-glusterd_bricks_select_bd (dict_t *dict, char **op_errstr)
+glusterd_bricks_select_snap (dict_t *dict, char **op_errstr,
+                             struct list_head *selected)
 {
         int                        ret           = -1;
         glusterd_conf_t            *priv         = NULL;
@@ -4307,31 +5058,31 @@ glusterd_bricks_select_bd (dict_t *dict, char **op_errstr)
 
         ret = dict_get_str (dict, "volname", &volname);
         if (ret) {
-                gf_log (this->name, GF_LOG_ERROR, "Unable to get volname");
+                gf_log (this->name, GF_LOG_ERROR, "Unable to get"
+                        " volname");
                 goto out;
         }
         ret = glusterd_volinfo_find (volname, &volinfo);
         if (ret)
                 goto out;
 
-        pending_node = GF_CALLOC (1, sizeof (*pending_node),
-                                  gf_gld_mt_pending_node_t);
-        if (!pending_node) {
-                ret = -1;
-                goto out;
-        }
-
         list_for_each_entry (brickinfo, &volinfo->bricks, brick_list) {
                 brick_index++;
                 if (uuid_compare (brickinfo->uuid, MY_UUID) ||
                     !glusterd_is_brick_started (brickinfo)) {
                         continue;
                 }
+                pending_node = GF_CALLOC (1, sizeof (*pending_node),
+                                          gf_gld_mt_pending_node_t);
+                if (!pending_node) {
+                        ret = -1;
+                        goto out;
+                }
                 pending_node->node = brickinfo;
                 pending_node->type = GD_NODE_BRICK;
                 pending_node->index = brick_index;
                 list_add_tail (&pending_node->list,
-                               &opinfo.pending_bricks);
+                               selected);
                 pending_node = NULL;
         }
 
@@ -4341,10 +5092,10 @@ out:
         gf_log (THIS->name, GF_LOG_DEBUG, "Returning ret %d", ret);
         return ret;
 }
-#endif
 
 static int
-fill_shd_status_for_local_bricks (dict_t *dict, glusterd_volinfo_t *volinfo)
+fill_shd_status_for_local_bricks (dict_t *dict, glusterd_volinfo_t *volinfo,
+                                  cli_cmd_type type, dict_t *req_dict)
 {
         glusterd_brickinfo_t    *brickinfo = NULL;
         char                    msg[1024] = {0,};
@@ -4353,10 +5104,22 @@ fill_shd_status_for_local_bricks (dict_t *dict, glusterd_volinfo_t *volinfo)
         int                     index = 0;
         int                     ret = 0;
         xlator_t               *this = NULL;
+        int                     cmd_replica_index = -1;
 
         this = THIS;
         snprintf (msg, sizeof (msg), "self-heal-daemon is not running on");
 
+        if (type == PER_REPLICA) {
+                cmd_replica_index = get_replica_index_for_per_replica_cmd
+                                    (volinfo, req_dict);
+                if (cmd_replica_index == -1) {
+                        gf_log (THIS->name, GF_LOG_ERROR, "Could not find the "
+                                "replica index for per replica type command");
+                        ret = -1;
+                        goto out;
+                }
+        }
+
         list_for_each_entry (brickinfo, &volinfo->bricks, brick_list) {
                 if (uuid_is_null (brickinfo->uuid))
                         (void)glusterd_resolve_brick (brickinfo);
@@ -4365,6 +5128,14 @@ fill_shd_status_for_local_bricks (dict_t *dict, glusterd_volinfo_t *volinfo)
                         index++;
                         continue;
                 }
+
+                if (type == PER_REPLICA) {
+                      if (cmd_replica_index != (index/volinfo->replica_count)) {
+                              index++;
+                              continue;
+                        }
+
+                }
                 snprintf (key, sizeof (key), "%d-status",index);
                 snprintf (value, sizeof (value), "%s %s",msg,
                           uuid_utoa(MY_UUID));
@@ -4433,21 +5204,49 @@ glusterd_bricks_select_heal_volume (dict_t *dict, char **op_errstr,
                 goto out;
         }
 
+        switch (heal_op) {
+                case GF_AFR_OP_INDEX_SUMMARY:
+                case GF_AFR_OP_STATISTICS_HEAL_COUNT:
+                if (!glusterd_is_nodesvc_online ("glustershd")) {
+                        if (!rsp_dict) {
+                                gf_log (this->name, GF_LOG_ERROR, "Received "
+                                        "empty ctx.");
+                                goto out;
+                        }
 
-        if (!glusterd_is_nodesvc_online ("glustershd") &&
-            (heal_op == GF_AFR_OP_INDEX_SUMMARY)) {
-
-                if (!rsp_dict) {
-                        gf_log (this->name, GF_LOG_ERROR, "Received empty "
-                                "ctx.");
+                        ret = fill_shd_status_for_local_bricks (rsp_dict,
+                                                                volinfo,
+                                                                ALL_REPLICA,
+                                                                dict);
+                        if (ret)
+                                gf_log (this->name, GF_LOG_ERROR, "Unable to "
+                                        "fill the shd status for the local "
+                                        "bricks");
                         goto out;
+
                 }
+                break;
+                case GF_AFR_OP_STATISTICS_HEAL_COUNT_PER_REPLICA:
+                if (!glusterd_is_nodesvc_online ("glustershd")) {
+                        if (!rsp_dict) {
+                                gf_log (this->name, GF_LOG_ERROR, "Received "
+                                        "empty ctx.");
+                                goto out;
+                        }
+                        ret = fill_shd_status_for_local_bricks (rsp_dict,
+                                                                volinfo,
+                                                                PER_REPLICA,
+                                                                dict);
+                        if (ret)
+                                gf_log (this->name, GF_LOG_ERROR, "Unable to "
+                                        "fill the shd status for the local"
+                                        " bricks.");
+                        goto out;
 
-                ret = fill_shd_status_for_local_bricks (rsp_dict, volinfo);
-                if (ret)
-                        gf_log (this->name, GF_LOG_ERROR, "Unable to fill the shd"
-                                " status for the local bricks");
-                goto out;
+                }
+                break;
+                default:
+                        break;
         }
 
 
@@ -4457,14 +5256,28 @@ glusterd_bricks_select_heal_volume (dict_t *dict, char **op_errstr,
                                                                      volinfo,
                                                                      dict);
                 break;
+        case GF_AFR_OP_STATISTICS_HEAL_COUNT_PER_REPLICA:
+                rxlator_count = _select_rxlators_with_local_bricks (this,
+                                                                   volinfo,
+                                                                   dict,
+                                                                   PER_REPLICA);
+                break;
         default:
                 rxlator_count = _select_rxlators_with_local_bricks (this,
                                                                     volinfo,
-                                                                    dict);
+                                                                    dict,
+                                                                   ALL_REPLICA);
                 break;
         }
         if (!rxlator_count)
                 goto out;
+        if (rxlator_count == -1){
+                gf_log (this->name, GF_LOG_ERROR, "Could not determine the"
+                        "translator count");
+                ret = -1;
+                goto out;
+        }
+
         ret = dict_set_int32 (dict, "count", rxlator_count);
         if (ret)
                 goto out;
@@ -4726,7 +5539,8 @@ glusterd_op_ac_send_brick_op (glusterd_op_sm_event_t *event, void *ctx)
 
         if (!opinfo.pending_count && !opinfo.brick_pending_count) {
                 glusterd_clear_pending_nodes (&opinfo.pending_bricks);
-                ret = glusterd_op_sm_inject_event (GD_OP_EVENT_ALL_ACK, req_ctx);
+                ret = glusterd_op_sm_inject_event (GD_OP_EVENT_ALL_ACK,
+                                                   &event->txn_id, req_ctx);
         }
 
 out:
@@ -4780,7 +5594,8 @@ glusterd_op_ac_rcvd_brick_op_acc (glusterd_op_sm_event_t *event, void *ctx)
         if (opinfo.brick_pending_count > 0)
                 goto out;
 
-        ret = glusterd_op_sm_inject_event (GD_OP_EVENT_ALL_ACK, ev_ctx->commit_ctx);
+        ret = glusterd_op_sm_inject_event (GD_OP_EVENT_ALL_ACK, &event->txn_id,
+                                           ev_ctx->commit_ctx);
 
 out:
         if (ev_ctx->rsp_dict)
@@ -4832,11 +5647,9 @@ glusterd_op_bricks_select (glusterd_op_t op, dict_t *dict, char **op_errstr,
                 ret = glusterd_bricks_select_rebalance_volume (dict, op_errstr,
                                                                selected);
                 break;
-#ifdef HAVE_BD_XLATOR
-        case GD_OP_BD_OP:
-                ret = glusterd_bricks_select_bd (dict, op_errstr);
+        case GD_OP_SNAP:
+                ret = glusterd_bricks_select_snap (dict, op_errstr, selected);
                 break;
-#endif
         default:
                 break;
          }
@@ -5158,7 +5971,7 @@ glusterd_op_sm_new_event (glusterd_op_sm_event_type_t event_type,
 
 int
 glusterd_op_sm_inject_event (glusterd_op_sm_event_type_t event_type,
-                             void *ctx)
+                             uuid_t *txn_id, void *ctx)
 {
         int32_t                 ret = -1;
         glusterd_op_sm_event_t  *event = NULL;
@@ -5173,6 +5986,9 @@ glusterd_op_sm_inject_event (glusterd_op_sm_event_type_t event_type,
 
         event->ctx = ctx;
 
+        if (txn_id)
+                uuid_copy (event->txn_id, *txn_id);
+
         gf_log (THIS->name, GF_LOG_DEBUG, "Enqueue event: '%s'",
                 glusterd_op_sm_event_name_get (event->event));
         list_add_tail (&event->list, &gd_op_sm_queue);
@@ -5233,6 +6049,7 @@ glusterd_op_sm ()
         glusterd_op_sm_t                *state = NULL;
         glusterd_op_sm_event_type_t     event_type = GD_OP_EVENT_NONE;
         xlator_t                        *this = NULL;
+        glusterd_op_info_t              txn_op_info;
 
         this = THIS;
         GF_ASSERT (this);
@@ -5253,6 +6070,20 @@ glusterd_op_sm ()
                                 "type: '%s'",
                                 glusterd_op_sm_event_name_get(event_type));
 
+                        gf_log ("", GF_LOG_DEBUG, "transaction ID = %s",
+                                uuid_utoa (event->txn_id));
+
+                        ret = glusterd_get_txn_opinfo (&event->txn_id,
+                                                       &txn_op_info);
+                        if (ret) {
+                                gf_log (this->name, GF_LOG_ERROR,
+                                        "Unable to get transaction's opinfo");
+                                glusterd_destroy_op_event_ctx (event);
+                                GF_FREE (event);
+                                continue;
+                        } else
+                                opinfo = txn_op_info;
+
                         state = glusterd_op_state_table[opinfo.state.state];
 
                         GF_ASSERT (state);
@@ -5283,8 +6114,27 @@ glusterd_op_sm ()
                                 return ret;
                         }
 
+                        if ((state[event_type].next_state ==
+                             GD_OP_STATE_DEFAULT) &&
+                           (event_type == GD_OP_EVENT_UNLOCK)) {
+                                /* Clearing the transaction opinfo */
+                                ret = glusterd_clear_txn_opinfo(&event->txn_id);
+                                if (ret)
+                                        gf_log (this->name, GF_LOG_ERROR,
+                                                "Unable to clear "
+                                                "transaction's opinfo");
+                        } else {
+                                ret = glusterd_set_txn_opinfo (&event->txn_id,
+                                                               &opinfo);
+                                if (ret)
+                                        gf_log (this->name, GF_LOG_ERROR,
+                                                "Unable to set "
+                                                "transaction's opinfo");
+                        }
+
                         glusterd_destroy_op_event_ctx (event);
                         GF_FREE (event);
+
                 }
         }
 
@@ -5338,52 +6188,6 @@ glusterd_op_clear_op (glusterd_op_t op)
 }
 
 int32_t
-glusterd_op_init_ctx (glusterd_op_t op)
-{
-        int     ret = 0;
-        dict_t *dict = NULL;
-        xlator_t *this = NULL;
-
-        this = THIS;
-        GF_ASSERT (this);
-        GF_ASSERT (GD_OP_NONE < op && op < GD_OP_MAX);
-
-        if (_gf_false == glusterd_need_brick_op (op)) {
-                gf_log (this->name, GF_LOG_DEBUG, "Received op: %s, returning",
-                        gd_op_list[op]);
-                goto out;
-        }
-        dict = dict_new ();
-        if (dict == NULL) {
-                ret = -1;
-                goto out;
-        }
-        ret = glusterd_op_set_ctx (dict);
-        if (ret)
-                goto out;
-out:
-        gf_log (this->name, GF_LOG_DEBUG, "Returning %d", ret);
-        return ret;
-}
-
-
-
-int32_t
-glusterd_op_fini_ctx ()
-{
-        dict_t *dict = NULL;
-
-        dict = glusterd_op_get_ctx ();
-        if (dict)
-                dict_unref (dict);
-
-        glusterd_op_reset_ctx ();
-        return 0;
-}
-
-
-
-int32_t
 glusterd_op_free_ctx (glusterd_op_t op, void *ctx)
 {
 
@@ -5409,9 +6213,6 @@ glusterd_op_free_ctx (glusterd_op_t op, void *ctx)
                 case GD_OP_STATEDUMP_VOLUME:
                 case GD_OP_CLEARLOCKS_VOLUME:
                 case GD_OP_DEFRAG_BRICK_VOLUME:
-#ifdef HAVE_BD_XLATOR
-                case GD_OP_BD_OP:
-#endif
                         dict_unref (ctx);
                         break;
                 default:
@@ -5440,4 +6241,3 @@ glusterd_op_sm_init ()
         pthread_mutex_init (&gd_op_sm_lock, NULL);
         return 0;
 }
-
diff --git a/xlators/mgmt/glusterd/src/glusterd-op-sm.h b/xlators/mgmt/glusterd/src/glusterd-op-sm.h
index df8b8c141..cf57b78e0 100644
--- a/xlators/mgmt/glusterd/src/glusterd-op-sm.h
+++ b/xlators/mgmt/glusterd/src/glusterd-op-sm.h
@@ -15,8 +15,8 @@
 #include "config.h"
 #endif
 
-#ifndef GSYNC_CONF
-#define GSYNC_CONF GEOREP"/gsyncd.conf"
+#ifndef GSYNC_CONF_TEMPLATE
+#define GSYNC_CONF_TEMPLATE GEOREP"/gsyncd_template.conf"
 #endif
 
 #include <pthread.h>
@@ -32,6 +32,8 @@
 #include "protocol-common.h"
 
 #define GD_VOLUME_NAME_MAX 256
+#define GD_OP_PROTECTED    (0x02)
+#define GD_OP_UNPROTECTED  (0x04)
 
 typedef enum glusterd_op_sm_state_ {
         GD_OP_STATE_DEFAULT = 0,
@@ -75,6 +77,7 @@ struct glusterd_op_sm_event_ {
         struct list_head                list;
         void                            *ctx;
         glusterd_op_sm_event_type_t     event;
+        uuid_t                          txn_id;
 };
 
 typedef struct glusterd_op_sm_event_ glusterd_op_sm_event_t;
@@ -117,6 +120,7 @@ typedef struct glusterd_op_log_filename_ctx_ glusterd_op_log_filename_ctx_t;
 
 struct glusterd_op_lock_ctx_ {
         uuid_t                  uuid;
+        dict_t                 *dict;
         rpcsvc_request_t        *req;
 };
 
@@ -162,12 +166,18 @@ typedef struct glusterd_gsync_status_temp {
         glusterd_volinfo_t *volinfo;
         char *node;
 }glusterd_gsync_status_temp_t;
+
+typedef enum cli_cmd_type_ {
+        PER_REPLICA,
+        ALL_REPLICA,
+ } cli_cmd_type;
+
 int
 glusterd_op_sm_new_event (glusterd_op_sm_event_type_t event_type,
                           glusterd_op_sm_event_t **new_event);
 int
 glusterd_op_sm_inject_event (glusterd_op_sm_event_type_t event_type,
-                             void *ctx);
+                             uuid_t *txn_id, void *ctx);
 
 int
 glusterd_op_sm_init ();
@@ -251,10 +261,7 @@ glusterd_op_init_commit_rsp_dict (glusterd_op_t op);
 
 void
 glusterd_op_modify_op_ctx (glusterd_op_t op, void *op_ctx);
-int32_t
-glusterd_op_init_ctx (glusterd_op_t op);
-int32_t
-glusterd_op_fini_ctx ();
+
 int32_t
 glusterd_volume_stats_read_perf (char *brick_path, int32_t blk_size,
                 int32_t blk_count, double *throughput, double *time);
@@ -270,7 +277,7 @@ glusterd_are_all_volumes_stopped ();
 int
 glusterd_stop_bricks (glusterd_volinfo_t *volinfo);
 int
-gsync_status (char *master, char *slave, int *status);
+gsync_status (char *master, char *slave, char *conf_path, int *status);
 
 int
 glusterd_check_gsync_running (glusterd_volinfo_t *volinfo, gf_boolean_t *flag);
@@ -278,4 +285,15 @@ glusterd_check_gsync_running (glusterd_volinfo_t *volinfo, gf_boolean_t *flag);
 int
 glusterd_defrag_volume_node_rsp (dict_t *req_dict, dict_t *rsp_dict,
                                  dict_t *op_ctx);
+int
+glusterd_is_valid_vg (glusterd_brickinfo_t *brick, int check_tag, char *msg);
+
+int32_t
+glusterd_get_txn_opinfo (uuid_t *txn_id, glusterd_op_info_t  *opinfo);
+
+int32_t
+glusterd_set_txn_opinfo (uuid_t *txn_id, glusterd_op_info_t  *opinfo);
+
+int32_t
+glusterd_clear_txn_opinfo (uuid_t *txn_id);
 #endif
diff --git a/xlators/mgmt/glusterd/src/glusterd-pmap.c b/xlators/mgmt/glusterd/src/glusterd-pmap.c
index cb29462c9..a153ca1a9 100644
--- a/xlators/mgmt/glusterd/src/glusterd-pmap.c
+++ b/xlators/mgmt/glusterd/src/glusterd-pmap.c
@@ -1,5 +1,5 @@
 /*
-   Copyright (c) 2010-2012 Red Hat, Inc. <http://www.redhat.com>
+   Copyright (c) 2010-2013 Red Hat, Inc. <http://www.redhat.com>
    This file is part of GlusterFS.
 
    This file is licensed to you under your choice of the GNU Lesser
@@ -52,8 +52,8 @@ pmap_port_isfree (int port)
 }
 
 
-struct pmap_registry *
-pmap_registry_new (void)
+static struct pmap_registry *
+pmap_registry_new (xlator_t *this)
 {
         struct pmap_registry *pmap = NULL;
         int                   i = 0;
@@ -69,8 +69,8 @@ pmap_registry_new (void)
                         pmap->ports[i].type = GF_PMAP_PORT_FOREIGN;
         }
 
-        pmap->base_port = GF_IANA_PRIV_PORTS_START;
-        pmap->last_alloc = GF_IANA_PRIV_PORTS_START;
+        pmap->base_port = pmap->last_alloc =
+                ((glusterd_conf_t *)(this->private))->base_port;
 
         return pmap;
 }
@@ -86,7 +86,7 @@ pmap_registry_get (xlator_t *this)
 
         pmap = priv->pmap;
         if (!pmap) {
-                pmap = pmap_registry_new ();
+                pmap = pmap_registry_new (this);
                 if (!pmap)
                         return NULL;
                 priv->pmap = pmap;
@@ -280,7 +280,7 @@ out:
 }
 
 int
-gluster_pmap_portbybrick (rpcsvc_request_t *req)
+__gluster_pmap_portbybrick (rpcsvc_request_t *req)
 {
         pmap_port_by_brick_req    args = {0,};
         pmap_port_by_brick_rsp    rsp  = {0,};
@@ -314,7 +314,14 @@ fail:
 
 
 int
-gluster_pmap_brickbyport (rpcsvc_request_t *req)
+gluster_pmap_portbybrick (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req, __gluster_pmap_portbybrick);
+}
+
+
+int
+__gluster_pmap_brickbyport (rpcsvc_request_t *req)
 {
         pmap_brick_by_port_req    args = {0,};
         pmap_brick_by_port_rsp    rsp  = {0,};
@@ -340,6 +347,14 @@ fail:
         return 0;
 }
 
+
+int
+gluster_pmap_brickbyport (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req, __gluster_pmap_brickbyport);
+}
+
+
 static int
 glusterd_brick_update_signin (glusterd_brickinfo_t *brickinfo,
                               gf_boolean_t value)
@@ -350,7 +365,7 @@ glusterd_brick_update_signin (glusterd_brickinfo_t *brickinfo,
 }
 
 int
-gluster_pmap_signup (rpcsvc_request_t *req)
+__gluster_pmap_signup (rpcsvc_request_t *req)
 {
         pmap_signup_req    args = {0,};
         pmap_signup_rsp    rsp  = {0,};
@@ -376,7 +391,13 @@ fail:
 }
 
 int
-gluster_pmap_signin (rpcsvc_request_t *req)
+gluster_pmap_signup (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req, __gluster_pmap_signup);
+}
+
+int
+__gluster_pmap_signin (rpcsvc_request_t *req)
 {
         pmap_signin_req    args = {0,};
         pmap_signin_rsp    rsp  = {0,};
@@ -407,9 +428,15 @@ fail:
 }
 
 
+int
+gluster_pmap_signin (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req, __gluster_pmap_signin);
+}
+
 
 int
-gluster_pmap_signout (rpcsvc_request_t *req)
+__gluster_pmap_signout (rpcsvc_request_t *req)
 {
         pmap_signout_req    args = {0,};
         pmap_signout_rsp    rsp  = {0,};
@@ -440,18 +467,19 @@ fail:
         return 0;
 }
 
+int
+gluster_pmap_signout (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req, __gluster_pmap_signout);
+}
+
 rpcsvc_actor_t gluster_pmap_actors[] = {
-        [GF_PMAP_NULL] = {"NULL", GF_PMAP_NULL, NULL, NULL, 0},
-        [GF_PMAP_PORTBYBRICK] = {"PORTBYBRICK", GF_PMAP_PORTBYBRICK,
-                                 gluster_pmap_portbybrick, NULL, 0},
-        [GF_PMAP_BRICKBYPORT] = {"BRICKBYPORT", GF_PMAP_BRICKBYPORT,
-                                 gluster_pmap_brickbyport, NULL, 0},
-        [GF_PMAP_SIGNIN] = {"SIGNIN", GF_PMAP_SIGNIN,
-                              gluster_pmap_signin, NULL, 0},
-        [GF_PMAP_SIGNOUT] = {"SIGNOUT", GF_PMAP_SIGNOUT,
-                              gluster_pmap_signout, NULL, 0},
-        [GF_PMAP_SIGNUP] = {"SIGNUP", GF_PMAP_SIGNUP,
-                              gluster_pmap_signup, NULL, 0},
+        [GF_PMAP_NULL]        = {"NULL",        GF_PMAP_NULL,        NULL,                     NULL, 0, DRC_NA},
+        [GF_PMAP_PORTBYBRICK] = {"PORTBYBRICK", GF_PMAP_PORTBYBRICK, gluster_pmap_portbybrick, NULL, 0, DRC_NA},
+        [GF_PMAP_BRICKBYPORT] = {"BRICKBYPORT", GF_PMAP_BRICKBYPORT, gluster_pmap_brickbyport, NULL, 0, DRC_NA},
+        [GF_PMAP_SIGNIN]      = {"SIGNIN",      GF_PMAP_SIGNIN,      gluster_pmap_signin,      NULL, 0, DRC_NA},
+        [GF_PMAP_SIGNOUT]     = {"SIGNOUT",     GF_PMAP_SIGNOUT,     gluster_pmap_signout,     NULL, 0, DRC_NA},
+        [GF_PMAP_SIGNUP]      = {"SIGNUP",      GF_PMAP_SIGNUP,      gluster_pmap_signup,      NULL, 0, DRC_NA},
 };
 
 
diff --git a/xlators/mgmt/glusterd/src/glusterd-quota.c b/xlators/mgmt/glusterd/src/glusterd-quota.c
index e049982a2..318267199 100644
--- a/xlators/mgmt/glusterd/src/glusterd-quota.c
+++ b/xlators/mgmt/glusterd/src/glusterd-quota.c
@@ -25,7 +25,7 @@
 #include <sys/wait.h>
 
 int
-glusterd_handle_quota (rpcsvc_request_t *req)
+__glusterd_handle_quota (rpcsvc_request_t *req)
 {
         int32_t                         ret = -1;
         gf_cli_req                      cli_req = {{0,}};
@@ -112,6 +112,12 @@ out:
         return ret;
 }
 
+int
+glusterd_handle_quota (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req, __glusterd_handle_quota);
+}
+
 int32_t
 glusterd_check_if_quota_trans_enabled (glusterd_volinfo_t *volinfo)
 {
@@ -257,7 +263,9 @@ glusterd_quota_initiate_fs_crawl (glusterd_conf_t *priv, char *volname)
                          "-l", DEFAULT_LOG_FILE_DIRECTORY"/quota-crawl.log",
                          mountdir, NULL);
 
+        synclock_unlock (&priv->big_lock);
         ret = runner_run_reuse (&runner);
+        synclock_lock (&priv->big_lock);
         if (ret == -1) {
                 runner_log (&runner, "glusterd", GF_LOG_DEBUG, "command failed");
                 runner_end (&runner);
diff --git a/xlators/mgmt/glusterd/src/glusterd-rebalance.c b/xlators/mgmt/glusterd/src/glusterd-rebalance.c
index 271de6111..b7b974c68 100644
--- a/xlators/mgmt/glusterd/src/glusterd-rebalance.c
+++ b/xlators/mgmt/glusterd/src/glusterd-rebalance.c
@@ -42,12 +42,27 @@ glusterd_brick_op_cbk (struct rpc_req *req, struct iovec *iov,
                           int count, void *myframe);
 int
 glusterd_defrag_start_validate (glusterd_volinfo_t *volinfo, char *op_errstr,
-                                size_t len)
+                                size_t len, glusterd_op_t op)
 {
-        int     ret = -1;
+        int      ret = -1;
+        xlator_t *this = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+
+        /* Check only if operation is not remove-brick */
+        if ((GD_OP_REMOVE_BRICK != op) &&
+            !gd_is_remove_brick_committed (volinfo)) {
+                gf_log (this->name, GF_LOG_DEBUG, "A remove-brick task on "
+                        "volume %s is not yet committed", volinfo->volname);
+                snprintf (op_errstr, len, "A remove-brick task on volume %s is"
+                          " not yet committed. Either commit or stop the "
+                          "remove-brick task.", volinfo->volname);
+                goto out;
+        }
 
         if (glusterd_is_defrag_on (volinfo)) {
-                gf_log ("glusterd", GF_LOG_DEBUG,
+                gf_log (this->name, GF_LOG_DEBUG,
                         "rebalance on volume %s already started",
                         volinfo->volname);
                 snprintf (op_errstr, len, "Rebalance on %s is already started",
@@ -57,7 +72,7 @@ glusterd_defrag_start_validate (glusterd_volinfo_t *volinfo, char *op_errstr,
 
         if (glusterd_is_rb_started (volinfo) ||
             glusterd_is_rb_paused (volinfo)) {
-                gf_log ("glusterd", GF_LOG_DEBUG,
+                gf_log (this->name, GF_LOG_DEBUG,
                         "Rebalance failed as replace brick is in progress on volume %s",
                         volinfo->volname);
                 snprintf (op_errstr, len, "Rebalance failed as replace brick is in progress on "
@@ -66,13 +81,14 @@ glusterd_defrag_start_validate (glusterd_volinfo_t *volinfo, char *op_errstr,
         }
         ret = 0;
 out:
-        gf_log ("glusterd", GF_LOG_DEBUG, "Returning %d", ret);
+        gf_log (this->name, GF_LOG_DEBUG, "Returning %d", ret);
         return ret;
 }
 
+
 int32_t
-glusterd_defrag_notify (struct rpc_clnt *rpc, void *mydata,
-                        rpc_clnt_event_t event, void *data)
+__glusterd_defrag_notify (struct rpc_clnt *rpc, void *mydata,
+                          rpc_clnt_event_t event, void *data)
 {
         glusterd_volinfo_t      *volinfo = NULL;
         glusterd_defrag_info_t  *defrag  = NULL;
@@ -130,8 +146,6 @@ glusterd_defrag_notify (struct rpc_clnt *rpc, void *mydata,
                                                 GF_DEFRAG_STATUS_STARTED) {
                                 volinfo->rebal.defrag_status =
                                                    GF_DEFRAG_STATUS_FAILED;
-                        } else {
-                                volinfo->rebal.defrag_cmd = 0;
                         }
                  }
 
@@ -160,6 +174,14 @@ glusterd_defrag_notify (struct rpc_clnt *rpc, void *mydata,
         return ret;
 }
 
+int32_t
+glusterd_defrag_notify (struct rpc_clnt *rpc, void *mydata,
+                        rpc_clnt_event_t event, void *data)
+{
+        return glusterd_big_locked_notify (rpc, mydata, event,
+                                           data, __glusterd_defrag_notify);
+}
+
 int
 glusterd_handle_defrag_start (glusterd_volinfo_t *volinfo, char *op_errstr,
                               size_t len, int cmd, defrag_cbk_fn_t cbk,
@@ -174,15 +196,14 @@ glusterd_handle_defrag_start (glusterd_volinfo_t *volinfo, char *op_errstr,
         char                   pidfile[PATH_MAX] = {0,};
         char                   logfile[PATH_MAX] = {0,};
         dict_t                 *options = NULL;
-#ifdef DEBUG
         char                   valgrind_logfile[PATH_MAX] = {0,};
-#endif
+
         priv    = THIS->private;
 
         GF_ASSERT (volinfo);
         GF_ASSERT (op_errstr);
 
-        ret = glusterd_defrag_start_validate (volinfo, op_errstr, len);
+        ret = glusterd_defrag_start_validate (volinfo, op_errstr, len, op);
         if (ret)
                 goto out;
         if (!volinfo->rebal.defrag)
@@ -196,6 +217,7 @@ glusterd_handle_defrag_start (glusterd_volinfo_t *volinfo, char *op_errstr,
 
         defrag->cmd = cmd;
 
+        volinfo->rebal.defrag_cmd = cmd;
         volinfo->rebal.op = op;
 
         LOCK_INIT (&defrag->lock);
@@ -218,7 +240,7 @@ glusterd_handle_defrag_start (glusterd_volinfo_t *volinfo, char *op_errstr,
         snprintf (logfile, PATH_MAX, "%s/%s-rebalance.log",
                     DEFAULT_LOG_FILE_DIRECTORY, volinfo->volname);
         runinit (&runner);
-#ifdef DEBUG
+
         if (priv->valgrind) {
                 snprintf (valgrind_logfile, PATH_MAX,
                           "%s/valgrind-%s-rebalance.log",
@@ -226,10 +248,10 @@ glusterd_handle_defrag_start (glusterd_volinfo_t *volinfo, char *op_errstr,
                           volinfo->volname);
 
                 runner_add_args (&runner, "valgrind", "--leak-check=full",
-                                 "--trace-children=yes", NULL);
+                                 "--trace-children=yes", "--track-origins=yes",
+                                 NULL);
                 runner_argprintf (&runner, "--log-file=%s", valgrind_logfile);
         }
-#endif
 
         runner_add_args (&runner, SBIN_DIR"/glusterfs",
                          "-s", "localhost", "--volfile-id", volinfo->volname,
@@ -241,6 +263,7 @@ glusterd_handle_defrag_start (glusterd_volinfo_t *volinfo, char *op_errstr,
                          "*replicate*.metadata-self-heal=off",
                          "--xlator-option", "*replicate*.entry-self-heal=off",
                          "--xlator-option", "*replicate*.readdir-failover=off",
+                         "--xlator-option", "*dht.readdir-optimize=on",
                          NULL);
         runner_add_arg (&runner, "--xlator-option");
         runner_argprintf ( &runner, "*dht.rebalance-cmd=%d",cmd);
@@ -268,14 +291,16 @@ glusterd_handle_defrag_start (glusterd_volinfo_t *volinfo, char *op_errstr,
          * default timeout of 30mins used for unreliable network connections is
          * too long for unix domain socket connections.
          */
-        ret = rpc_clnt_transport_unix_options_build (&options, sockfile, 600);
+        ret = rpc_transport_unix_options_build (&options, sockfile, 600);
         if (ret) {
                 gf_log (THIS->name, GF_LOG_ERROR, "Unix options build failed");
                 goto out;
         }
 
+        synclock_unlock (&priv->big_lock);
         ret = glusterd_rpc_create (&defrag->rpc, options,
                                    glusterd_defrag_notify, volinfo);
+        synclock_lock (&priv->big_lock);
         if (ret) {
                 gf_log (THIS->name, GF_LOG_ERROR, "RPC create failed");
                 goto out;
@@ -320,14 +345,16 @@ glusterd_rebalance_rpc_create (glusterd_volinfo_t *volinfo,
          * default timeout of 30mins used for unreliable network connections is
          * too long for unix domain socket connections.
          */
-        ret = rpc_clnt_transport_unix_options_build (&options, sockfile, 600);
+        ret = rpc_transport_unix_options_build (&options, sockfile, 600);
         if (ret) {
                 gf_log (THIS->name, GF_LOG_ERROR, "Unix options build failed");
                 goto out;
         }
 
+        synclock_unlock (&priv->big_lock);
         ret = glusterd_rpc_create (&defrag->rpc, options,
                                    glusterd_defrag_notify, volinfo);
+        synclock_lock (&priv->big_lock);
         if (ret) {
                 gf_log (THIS->name, GF_LOG_ERROR, "RPC create failed");
                 goto out;
@@ -376,7 +403,7 @@ out:
 }
 
 int
-glusterd_handle_defrag_volume (rpcsvc_request_t *req)
+__glusterd_handle_defrag_volume (rpcsvc_request_t *req)
 {
         int32_t                 ret       = -1;
         gf_cli_req              cli_req   = {{0,}};
@@ -461,6 +488,12 @@ out:
         return 0;
 }
 
+int
+glusterd_handle_defrag_volume (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req, __glusterd_handle_defrag_volume);
+}
+
 
 int
 glusterd_op_stage_rebalance (dict_t *dict, char **op_errstr)
@@ -499,7 +532,7 @@ glusterd_op_stage_rebalance (dict_t *dict, char **op_errstr)
         case GF_DEFRAG_CMD_START:
         case GF_DEFRAG_CMD_START_LAYOUT_FIX:
         case GF_DEFRAG_CMD_START_FORCE:
-                if (is_origin_glusterd ()) {
+                if (is_origin_glusterd (dict)) {
                         op_ctx = glusterd_op_get_ctx ();
                         if (!op_ctx) {
                                 ret = -1;
@@ -525,8 +558,9 @@ glusterd_op_stage_rebalance (dict_t *dict, char **op_errstr)
                                 ret = 0;
                         }
                 }
-                ret = glusterd_defrag_start_validate (volinfo,
-                                msg, sizeof (msg));
+                ret = glusterd_defrag_start_validate (volinfo, msg,
+                                                      sizeof (msg),
+                                                      GD_OP_REBALANCE);
                 if (ret) {
                         gf_log (this->name, GF_LOG_DEBUG,
                                         "start validate failed");
@@ -629,15 +663,18 @@ glusterd_op_rebalance (dict_t *dict, char **op_errstr, dict_t *rsp_dict)
                         ret = 0;
                 } else {
                         uuid_parse (task_id_str, volinfo->rebal.rebalance_id) ;
+                        volinfo->rebal.op = GD_OP_REBALANCE;
                 }
                 ret = glusterd_handle_defrag_start (volinfo, msg, sizeof (msg),
                                                     cmd, NULL, GD_OP_REBALANCE);
                  break;
         case GF_DEFRAG_CMD_STOP:
-                /* Clear task-id only on explicitly stopping the
-                 * rebalance process.
+                /* Clear task-id only on explicitly stopping rebalance.
+                 * Also clear the stored operation, so it doesn't cause trouble
+                 * with future rebalance/remove-brick starts
                  */
                 uuid_clear (volinfo->rebal.rebalance_id);
+                volinfo->rebal.op = GD_OP_NONE;
 
                 /* Fall back to the old volume file in case of decommission*/
                 list_for_each_entry_safe (brickinfo, tmp, &volinfo->bricks,
diff --git a/xlators/mgmt/glusterd/src/glusterd-replace-brick.c b/xlators/mgmt/glusterd/src/glusterd-replace-brick.c
index ec69b3637..54b830870 100644
--- a/xlators/mgmt/glusterd/src/glusterd-replace-brick.c
+++ b/xlators/mgmt/glusterd/src/glusterd-replace-brick.c
@@ -31,6 +31,7 @@
                   DEFAULT_VAR_RUN_DIRECTORY"/%s-"RB_CLIENT_MOUNTPOINT,      \
                   volinfo->volname);
 
+extern uuid_t global_txn_id;
 
 int
 glusterd_get_replace_op_str (gf1_cli_replace_op op, char *op_str)
@@ -70,7 +71,7 @@ out:
 }
 
 int
-glusterd_handle_replace_brick (rpcsvc_request_t *req)
+__glusterd_handle_replace_brick (rpcsvc_request_t *req)
 {
         int32_t                         ret = -1;
         gf_cli_req                      cli_req = {{0,}};
@@ -171,6 +172,13 @@ out:
         return ret;
 }
 
+int
+glusterd_handle_replace_brick (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req,
+                                            __glusterd_handle_replace_brick);
+}
+
 static int
 glusterd_get_rb_dst_brickinfo (glusterd_volinfo_t *volinfo,
                                glusterd_brickinfo_t **brickinfo)
@@ -210,10 +218,10 @@ glusterd_op_stage_replace_brick (dict_t *dict, char **op_errstr,
         dict_t                                  *ctx           = NULL;
         glusterd_conf_t                         *priv          = NULL;
         char                                    *savetok       = NULL;
-        char                                     voldir[PATH_MAX] = {0};
         char                                     pidfile[PATH_MAX] = {0};
         char                                    *task_id_str = NULL;
         xlator_t                                *this = NULL;
+        gf_boolean_t                            is_force = _gf_false;
 
         this = THIS;
         GF_ASSERT (this);
@@ -261,13 +269,6 @@ glusterd_op_stage_replace_brick (dict_t *dict, char **op_errstr,
                 goto out;
         }
 
-        if (volinfo->backend == GD_VOL_BK_BD) {
-                snprintf (msg, sizeof (msg), "replace brick not supported "
-                       "for Block backend volume");
-                *op_errstr = gf_strdup (msg);
-                goto out;
-        }
-
         if (GLUSTERD_STATUS_STARTED != volinfo->status) {
                 ret = -1;
                 snprintf (msg, sizeof (msg), "volume: %s is not started",
@@ -325,7 +326,7 @@ glusterd_op_stage_replace_brick (dict_t *dict, char **op_errstr,
                         ret = -1;
                         goto out;
                 }
-                if (is_origin_glusterd ()) {
+                if (is_origin_glusterd (dict)) {
                         if (!ctx) {
                                 ret = -1;
                                 gf_log (this->name, GF_LOG_ERROR,
@@ -350,6 +351,8 @@ glusterd_op_stage_replace_brick (dict_t *dict, char **op_errstr,
                                 ret = 0;
                         }
                 }
+                is_force = dict_get_str_boolean (dict, "force", _gf_false);
+
                 break;
 
         case GF_REPLACE_OP_PAUSE:
@@ -384,7 +387,9 @@ glusterd_op_stage_replace_brick (dict_t *dict, char **op_errstr,
                 }
                 break;
 
-        case GF_REPLACE_OP_COMMIT_FORCE: break;
+        case GF_REPLACE_OP_COMMIT_FORCE:
+                is_force = _gf_true;
+                break;
 
         case GF_REPLACE_OP_STATUS:
 
@@ -430,7 +435,7 @@ glusterd_op_stage_replace_brick (dict_t *dict, char **op_errstr,
                 }
         }
 
-        if (glusterd_is_local_addr (src_brickinfo->hostname)) {
+        if (gf_is_local_addr (src_brickinfo->hostname)) {
                 gf_log (this->name, GF_LOG_DEBUG,
                         "I AM THE SOURCE HOST");
                 if (src_brickinfo->port && rsp_dict) {
@@ -443,10 +448,8 @@ glusterd_op_stage_replace_brick (dict_t *dict, char **op_errstr,
                         }
                 }
 
-                GLUSTERD_GET_VOLUME_DIR (voldir, volinfo, priv);
-                GLUSTERD_GET_BRICK_PIDFILE (pidfile, voldir,
-                                            src_brickinfo->hostname,
-                                            src_brickinfo->path);
+                GLUSTERD_GET_BRICK_PIDFILE (pidfile, volinfo, src_brickinfo,
+                                            priv);
                 if ((replace_op != GF_REPLACE_OP_COMMIT_FORCE) &&
                     !glusterd_is_service_running (pidfile, NULL)) {
                         snprintf(msg, sizeof(msg), "Source brick %s:%s "
@@ -509,15 +512,15 @@ glusterd_op_stage_replace_brick (dict_t *dict, char **op_errstr,
        }
 
         if (!glusterd_is_rb_ongoing (volinfo) &&
-            glusterd_is_local_addr (host)) {
-                ret = glusterd_brick_create_path (host, path,
+            gf_is_local_addr (host)) {
+                ret = glusterd_validate_and_create_brickpath (dst_brickinfo,
                                                   volinfo->volume_id,
-                                                  op_errstr);
+                                                  op_errstr, is_force);
                 if (ret)
                         goto out;
         }
 
-        if (!glusterd_is_local_addr (host)) {
+        if (!gf_is_local_addr (host)) {
                 ret = glusterd_friend_find (NULL, host, &peerinfo);
                 if (ret) {
                         snprintf (msg, sizeof (msg), "%s, is not a friend",
@@ -544,7 +547,7 @@ glusterd_op_stage_replace_brick (dict_t *dict, char **op_errstr,
         }
 
         if (replace_op == GF_REPLACE_OP_START &&
-            glusterd_is_local_addr (volinfo->rep_brick.dst_brick->hostname)) {
+            gf_is_local_addr (volinfo->rep_brick.dst_brick->hostname)) {
                 port = pmap_registry_alloc (THIS);
                 if (!port) {
                         gf_log (THIS->name, GF_LOG_CRITICAL,
@@ -685,7 +688,7 @@ rb_src_brick_restart (glusterd_volinfo_t *volinfo,
 
         sleep (2);
         ret = glusterd_volume_start_glusterfs (volinfo, src_brickinfo,
-                                              _gf_false);
+                                               _gf_false);
         if (ret) {
                 gf_log ("", GF_LOG_ERROR, "Unable to start "
                         "glusterfs, ret: %d", ret);
@@ -748,7 +751,7 @@ rb_spawn_dst_brick (glusterd_volinfo_t *volinfo,
         if (volinfo->memory_accounting)
                 runner_add_arg (&runner, "--mem-accounting");
 
-        ret = runner_run (&runner);
+        ret = runner_run_nowait (&runner);
         if (ret) {
                 pmap_registry_remove (THIS, 0, brickinfo->path,
                                       GF_PMAP_PORT_BRICKSERVER, NULL);
@@ -1405,7 +1408,7 @@ rb_update_srcbrick_port (glusterd_brickinfo_t *src_brickinfo, dict_t *rsp_dict,
         if (src_port)
                 src_brickinfo->port = src_port;
 
-        if (glusterd_is_local_addr (src_brickinfo->hostname)) {
+        if (gf_is_local_addr (src_brickinfo->hostname)) {
                 gf_log ("", GF_LOG_INFO,
                         "adding src-brick port no");
 
@@ -1459,7 +1462,7 @@ rb_update_dstbrick_port (glusterd_brickinfo_t *dst_brickinfo, dict_t *rsp_dict,
                 dst_brickinfo->port = dst_port;
 
 
-        if (glusterd_is_local_addr (dst_brickinfo->hostname)) {
+        if (gf_is_local_addr (dst_brickinfo->hostname)) {
                 gf_log ("", GF_LOG_INFO,
                         "adding dst-brick port no");
 
@@ -1629,7 +1632,7 @@ glusterd_op_replace_brick (dict_t *dict, dict_t *rsp_dict)
                 /* Set task-id, if available, in op_ctx dict for operations
                  * other than start
                  */
-                if  (is_origin_glusterd ()) {
+                if  (is_origin_glusterd (dict)) {
                         ctx = glusterd_op_get_ctx();
                         if (!ctx) {
                                 gf_log (this->name, GF_LOG_ERROR, "Failed to "
@@ -1667,7 +1670,7 @@ glusterd_op_replace_brick (dict_t *dict, dict_t *rsp_dict)
                         uuid_parse (task_id_str, volinfo->rep_brick.rb_id);
                 }
 
-                if (glusterd_is_local_addr (dst_brickinfo->hostname)) {
+                if (gf_is_local_addr (dst_brickinfo->hostname)) {
                         gf_log (this->name, GF_LOG_INFO,
                                 "I AM THE DESTINATION HOST");
                         if (!glusterd_is_rb_paused (volinfo)) {
@@ -1687,7 +1690,7 @@ glusterd_op_replace_brick (dict_t *dict, dict_t *rsp_dict)
 		}
 
 
-		if (glusterd_is_local_addr (src_brickinfo->hostname)) {
+		if (gf_is_local_addr (src_brickinfo->hostname)) {
 		        ret = rb_src_brick_restart (volinfo, src_brickinfo,
 				                    1);
 		        if (ret) {
@@ -1697,7 +1700,7 @@ glusterd_op_replace_brick (dict_t *dict, dict_t *rsp_dict)
 			}
 		}
 
-		if (glusterd_is_local_addr (dst_brickinfo->hostname)) {
+		if (gf_is_local_addr (dst_brickinfo->hostname)) {
 			gf_log (this->name, GF_LOG_INFO,
 				"adding dst-brick port no");
 
@@ -1728,7 +1731,7 @@ glusterd_op_replace_brick (dict_t *dict, dict_t *rsp_dict)
                 /* fall through */
         case GF_REPLACE_OP_COMMIT_FORCE:
         {
-                if (glusterd_is_local_addr (dst_brickinfo->hostname)) {
+                if (gf_is_local_addr (dst_brickinfo->hostname)) {
                         gf_log (this->name, GF_LOG_DEBUG,
                                 "I AM THE DESTINATION HOST");
                         ret = rb_kill_destination_brick (volinfo,
@@ -1809,7 +1812,7 @@ glusterd_op_replace_brick (dict_t *dict, dict_t *rsp_dict)
                         }
                 }
 
-                if (glusterd_is_local_addr (src_brickinfo->hostname)) {
+                if (gf_is_local_addr (src_brickinfo->hostname)) {
                         ret = rb_src_brick_restart (volinfo, src_brickinfo,
                                                     0);
                         if (ret) {
@@ -1820,7 +1823,7 @@ glusterd_op_replace_brick (dict_t *dict, dict_t *rsp_dict)
                         }
                 }
 
-                if (glusterd_is_local_addr (dst_brickinfo->hostname)) {
+                if (gf_is_local_addr (dst_brickinfo->hostname)) {
                         gf_log (this->name, GF_LOG_INFO,
                                 "I AM THE DESTINATION HOST");
                         ret = rb_kill_destination_brick (volinfo, dst_brickinfo);
@@ -1892,6 +1895,7 @@ glusterd_do_replace_brick (void *data)
         glusterd_brickinfo_t   *src_brickinfo = NULL;
         glusterd_brickinfo_t   *dst_brickinfo = NULL;
 	glusterd_conf_t	       *priv = NULL;
+        uuid_t                 *txn_id = &global_txn_id;
 
         int ret = 0;
 
@@ -1911,6 +1915,10 @@ glusterd_do_replace_brick (void *data)
         gf_log ("", GF_LOG_DEBUG,
                 "Replace brick operation detected");
 
+        ret = dict_get_bin (dict, "transaction_id", (void **)&txn_id);
+
+        gf_log ("", GF_LOG_DEBUG, "transaction ID = %s", uuid_utoa (*txn_id));
+
         ret = dict_get_int32 (dict, "operation", &op);
         if (ret) {
                 gf_log ("", GF_LOG_DEBUG,
@@ -2006,9 +2014,11 @@ glusterd_do_replace_brick (void *data)
 
 out:
         if (ret)
-                ret = glusterd_op_sm_inject_event (GD_OP_EVENT_RCVD_RJT, NULL);
+                ret = glusterd_op_sm_inject_event (GD_OP_EVENT_RCVD_RJT,
+                                                   txn_id, NULL);
         else
-                ret = glusterd_op_sm_inject_event (GD_OP_EVENT_COMMIT_ACC, NULL);
+                ret = glusterd_op_sm_inject_event (GD_OP_EVENT_COMMIT_ACC,
+                                                   txn_id, NULL);
 
         glusterd_op_sm ();
 }
diff --git a/xlators/mgmt/glusterd/src/glusterd-rpc-ops.c b/xlators/mgmt/glusterd/src/glusterd-rpc-ops.c
index 124972857..d5200a4ae 100644
--- a/xlators/mgmt/glusterd/src/glusterd-rpc-ops.c
+++ b/xlators/mgmt/glusterd/src/glusterd-rpc-ops.c
@@ -33,6 +33,7 @@
 
 
 extern glusterd_op_info_t opinfo;
+extern uuid_t global_txn_id;
 
 int32_t
 glusterd_op_send_cli_response (glusterd_op_t op, int32_t op_ret,
@@ -84,6 +85,7 @@ glusterd_op_send_cli_response (glusterd_op_t op, int32_t op_ret,
                 }
                 break;
         }
+        case GD_OP_GSYNC_CREATE:
         case GD_OP_GSYNC_SET:
         {
                if (ctx) {
@@ -141,11 +143,26 @@ glusterd_op_send_cli_response (glusterd_op_t op, int32_t op_ret,
         case GD_OP_LIST_VOLUME:
         case GD_OP_CLEARLOCKS_VOLUME:
         case GD_OP_HEAL_VOLUME:
-        case GD_OP_BD_OP:
+        case GD_OP_SNAP:
         {
                 /*nothing specific to be done*/
                 break;
         }
+        case GD_OP_COPY_FILE:
+        {
+               if (ctx)
+                        ret = dict_get_str (ctx, "errstr", &errstr);
+               break;
+        }
+        case GD_OP_SYS_EXEC:
+        {
+               if (ctx) {
+                        ret = dict_get_str (ctx, "errstr", &errstr);
+                        ret = dict_set_str (ctx, "glusterd_workdir",
+                                            conf->workdir);
+               }
+               break;
+        }
         }
 
         rsp.op_ret = op_ret;
@@ -185,7 +202,21 @@ glusterd_op_send_cli_response (glusterd_op_t op, int32_t op_ret,
 }
 
 int
-glusterd_probe_cbk (struct rpc_req *req, struct iovec *iov,
+glusterd_big_locked_cbk (struct rpc_req *req, struct iovec *iov,
+                         int count, void *myframe, fop_cbk_fn_t fn)
+{
+        glusterd_conf_t *priv = THIS->private;
+        int             ret   = -1;
+
+        synclock_lock (&priv->big_lock);
+        ret = fn (req, iov, count, myframe);
+        synclock_unlock (&priv->big_lock);
+
+        return ret;
+}
+
+int
+__glusterd_probe_cbk (struct rpc_req *req, struct iovec *iov,
                         int count, void *myframe)
 {
         gd1_mgmt_probe_rsp    rsp   = {{0},};
@@ -219,7 +250,8 @@ glusterd_probe_cbk (struct rpc_req *req, struct iovec *iov,
                         glusterd_xfer_cli_probe_resp (ctx->req, rsp.op_ret,
                                                       rsp.op_errno,
                                                       rsp.op_errstr,
-                                                      ctx->hostname, ctx->port);
+                                                      ctx->hostname, ctx->port,
+                                                      ctx->dict);
                 }
 
                 glusterd_destroy_probe_ctx (ctx);
@@ -247,7 +279,8 @@ glusterd_probe_cbk (struct rpc_req *req, struct iovec *iov,
                         glusterd_xfer_cli_probe_resp (ctx->req, rsp.op_ret,
                                                       rsp.op_errno,
                                                       rsp.op_errstr,
-                                                      ctx->hostname, ctx->port);
+                                                      ctx->hostname, ctx->port,
+                                                      ctx->dict);
                 }
 
                 glusterd_destroy_probe_ctx (ctx);
@@ -287,7 +320,16 @@ out:
 }
 
 int
-glusterd_friend_add_cbk (struct rpc_req * req, struct iovec *iov,
+glusterd_probe_cbk (struct rpc_req *req, struct iovec *iov,
+                    int count, void *myframe)
+{
+        return glusterd_big_locked_cbk (req, iov, count, myframe,
+                                        __glusterd_probe_cbk);
+}
+
+
+int
+__glusterd_friend_add_cbk (struct rpc_req * req, struct iovec *iov,
                             int count, void *myframe)
 {
         gd1_mgmt_friend_rsp           rsp   = {{0},};
@@ -367,7 +409,7 @@ out:
         if (ctx->req)//reverse probe doesn't have req
                 ret = glusterd_xfer_cli_probe_resp (ctx->req, op_ret, op_errno,
                                                     NULL, ctx->hostname,
-                                                    ctx->port);
+                                                    ctx->port, ctx->dict);
         if (!ret) {
                 glusterd_friend_sm ();
                 glusterd_op_sm ();
@@ -380,7 +422,15 @@ out:
 }
 
 int
-glusterd_friend_remove_cbk (struct rpc_req * req, struct iovec *iov,
+glusterd_friend_add_cbk (struct rpc_req *req, struct iovec *iov,
+                    int count, void *myframe)
+{
+        return glusterd_big_locked_cbk (req, iov, count, myframe,
+                                        __glusterd_friend_add_cbk);
+}
+
+int
+__glusterd_friend_remove_cbk (struct rpc_req * req, struct iovec *iov,
                                int count, void *myframe)
 {
         gd1_mgmt_friend_rsp             rsp   = {{0},};
@@ -457,7 +507,7 @@ inject:
 
 respond:
         ret = glusterd_xfer_cli_deprobe_resp (ctx->req, op_ret, op_errno, NULL,
-                                              ctx->hostname);
+                                              ctx->hostname, ctx->dict);
         if (!ret && move_sm_now) {
                 glusterd_friend_sm ();
                 glusterd_op_sm ();
@@ -473,8 +523,16 @@ respond:
         return ret;
 }
 
+int
+glusterd_friend_remove_cbk (struct rpc_req *req, struct iovec *iov,
+                    int count, void *myframe)
+{
+        return glusterd_big_locked_cbk (req, iov, count, myframe,
+                                        __glusterd_friend_remove_cbk);
+}
+
 int32_t
-glusterd_friend_update_cbk (struct rpc_req *req, struct iovec *iov,
+__glusterd_friend_update_cbk (struct rpc_req *req, struct iovec *iov,
                               int count, void *myframe)
 {
         int                           ret    = -1;
@@ -506,8 +564,16 @@ out:
         return ret;
 }
 
+int
+glusterd_friend_update_cbk (struct rpc_req *req, struct iovec *iov,
+                    int count, void *myframe)
+{
+        return glusterd_big_locked_cbk (req, iov, count, myframe,
+                                        __glusterd_friend_update_cbk);
+}
+
 int32_t
-glusterd_cluster_lock_cbk (struct rpc_req *req, struct iovec *iov,
+__glusterd_cluster_lock_cbk (struct rpc_req *req, struct iovec *iov,
                               int count, void *myframe)
 {
         gd1_mgmt_cluster_lock_rsp     rsp   = {{0},};
@@ -516,6 +582,7 @@ glusterd_cluster_lock_cbk (struct rpc_req *req, struct iovec *iov,
         glusterd_op_sm_event_type_t   event_type = GD_OP_EVENT_NONE;
         glusterd_peerinfo_t           *peerinfo = NULL;
         xlator_t                      *this = NULL;
+        uuid_t                        *txn_id = &global_txn_id;
 
         this = THIS;
         GF_ASSERT (this);
@@ -560,7 +627,7 @@ out:
                 event_type = GD_OP_EVENT_RCVD_ACC;
         }
 
-        ret = glusterd_op_sm_inject_event (event_type, NULL);
+        ret = glusterd_op_sm_inject_event (event_type, txn_id, NULL);
 
         if (!ret) {
                 glusterd_friend_sm ();
@@ -572,7 +639,173 @@ out:
 }
 
 int32_t
-glusterd_cluster_unlock_cbk (struct rpc_req *req, struct iovec *iov,
+glusterd_cluster_lock_cbk (struct rpc_req *req, struct iovec *iov,
+                              int count, void *myframe)
+{
+        return glusterd_big_locked_cbk (req, iov, count, myframe,
+                                        __glusterd_cluster_lock_cbk);
+}
+
+static int32_t
+glusterd_mgmt_v3_lock_peers_cbk_fn (struct rpc_req *req, struct iovec *iov,
+                                    int count, void *myframe)
+{
+        gd1_mgmt_v3_lock_rsp          rsp   = {{0},};
+        int                           ret   = -1;
+        int32_t                       op_ret = -1;
+        glusterd_op_sm_event_type_t   event_type = GD_OP_EVENT_NONE;
+        glusterd_peerinfo_t           *peerinfo = NULL;
+        xlator_t                      *this = NULL;
+        uuid_t                        *txn_id = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (req);
+
+        if (-1 == req->rpc_status) {
+                rsp.op_ret   = -1;
+                rsp.op_errno = EINVAL;
+                goto out;
+        }
+
+        ret = xdr_to_generic (*iov, &rsp,
+                              (xdrproc_t)xdr_gd1_mgmt_v3_lock_rsp);
+        if (ret < 0) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Failed to decode mgmt_v3 lock "
+                        "response received from peer");
+                rsp.op_ret   = -1;
+                rsp.op_errno = EINVAL;
+                goto out;
+        }
+
+out:
+        op_ret = rsp.op_ret;
+
+        txn_id = &rsp.txn_id;
+
+        gf_log (this->name, (op_ret) ? GF_LOG_ERROR : GF_LOG_DEBUG,
+                "Received mgmt_v3 lock %s from uuid: %s",
+                (op_ret) ? "RJT" : "ACC", uuid_utoa (rsp.uuid));
+
+        ret = glusterd_friend_find (rsp.uuid, NULL, &peerinfo);
+        if (ret) {
+                gf_log (this->name, GF_LOG_CRITICAL,
+                        "mgmt_v3 lock response received "
+                        "from unknown peer: %s", uuid_utoa (rsp.uuid));
+        }
+
+        if (op_ret) {
+                event_type = GD_OP_EVENT_RCVD_RJT;
+                opinfo.op_ret = op_ret;
+                opinfo.op_errstr = gf_strdup ("Another transaction could be in "
+                                              "progress. Please try again after"
+                                              " sometime.");
+        } else {
+                event_type = GD_OP_EVENT_RCVD_ACC;
+        }
+
+        ret = glusterd_op_sm_inject_event (event_type, txn_id, NULL);
+
+        if (!ret) {
+                glusterd_friend_sm ();
+                glusterd_op_sm ();
+        }
+
+        GLUSTERD_STACK_DESTROY (((call_frame_t *)myframe));
+        return ret;
+}
+
+int32_t
+glusterd_mgmt_v3_lock_peers_cbk (struct rpc_req *req, struct iovec *iov,
+                                 int count, void *myframe)
+{
+        return glusterd_big_locked_cbk (req, iov, count, myframe,
+                                        glusterd_mgmt_v3_lock_peers_cbk_fn);
+}
+
+static int32_t
+glusterd_mgmt_v3_unlock_peers_cbk_fn (struct rpc_req *req, struct iovec *iov,
+                                      int count, void *myframe)
+{
+        gd1_mgmt_v3_unlock_rsp        rsp   = {{0},};
+        int                           ret   = -1;
+        int32_t                       op_ret = -1;
+        glusterd_op_sm_event_type_t   event_type = GD_OP_EVENT_NONE;
+        glusterd_peerinfo_t           *peerinfo = NULL;
+        xlator_t                      *this = NULL;
+        uuid_t                        *txn_id = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (req);
+
+        if (-1 == req->rpc_status) {
+                rsp.op_ret   = -1;
+                rsp.op_errno = EINVAL;
+                goto out;
+        }
+
+        ret = xdr_to_generic (*iov, &rsp,
+                              (xdrproc_t)xdr_gd1_mgmt_v3_unlock_rsp);
+        if (ret < 0) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Failed to decode mgmt_v3 unlock "
+                        "response received from peer");
+                rsp.op_ret   = -1;
+                rsp.op_errno = EINVAL;
+                goto out;
+        }
+
+out:
+        op_ret = rsp.op_ret;
+
+        txn_id = &rsp.txn_id;
+
+        gf_log (this->name, (op_ret) ? GF_LOG_ERROR : GF_LOG_DEBUG,
+                "Received mgmt_v3 unlock %s from uuid: %s",
+                (op_ret) ? "RJT" : "ACC",
+                uuid_utoa (rsp.uuid));
+
+        ret = glusterd_friend_find (rsp.uuid, NULL, &peerinfo);
+
+        if (ret) {
+                gf_log (this->name, GF_LOG_CRITICAL,
+                        "mgmt_v3 unlock response received "
+                        "from unknown peer: %s", uuid_utoa (rsp.uuid));
+        }
+
+        if (op_ret) {
+                event_type = GD_OP_EVENT_RCVD_RJT;
+                opinfo.op_ret = op_ret;
+                opinfo.op_errstr = gf_strdup ("Another transaction could be in "
+                                              "progress. Please try again after"
+                                              " sometime.");
+        } else {
+                event_type = GD_OP_EVENT_RCVD_ACC;
+        }
+
+        ret = glusterd_op_sm_inject_event (event_type, txn_id, NULL);
+
+        if (!ret) {
+                glusterd_friend_sm ();
+                glusterd_op_sm ();
+        }
+
+        GLUSTERD_STACK_DESTROY (((call_frame_t *)myframe));
+        return ret;
+}
+
+int32_t
+glusterd_mgmt_v3_unlock_peers_cbk (struct rpc_req *req, struct iovec *iov,
+                                   int count, void *myframe)
+{
+        return glusterd_big_locked_cbk (req, iov, count, myframe,
+                                        glusterd_mgmt_v3_unlock_peers_cbk_fn);
+}
+
+int32_t
+__glusterd_cluster_unlock_cbk (struct rpc_req *req, struct iovec *iov,
                                  int count, void *myframe)
 {
         gd1_mgmt_cluster_lock_rsp     rsp   = {{0},};
@@ -581,6 +814,7 @@ glusterd_cluster_unlock_cbk (struct rpc_req *req, struct iovec *iov,
         glusterd_op_sm_event_type_t   event_type = GD_OP_EVENT_NONE;
         glusterd_peerinfo_t           *peerinfo = NULL;
         xlator_t                      *this = NULL;
+        uuid_t                        *txn_id = &global_txn_id;
 
         this = THIS;
         GF_ASSERT (this);
@@ -622,7 +856,7 @@ out:
                 event_type = GD_OP_EVENT_RCVD_ACC;
         }
 
-        ret = glusterd_op_sm_inject_event (event_type, NULL);
+        ret = glusterd_op_sm_inject_event (event_type, txn_id, NULL);
 
         if (!ret) {
                 glusterd_friend_sm ();
@@ -634,7 +868,15 @@ out:
 }
 
 int32_t
-glusterd_stage_op_cbk (struct rpc_req *req, struct iovec *iov,
+glusterd_cluster_unlock_cbk (struct rpc_req *req, struct iovec *iov,
+                                 int count, void *myframe)
+{
+        return glusterd_big_locked_cbk (req, iov, count, myframe,
+                                        __glusterd_cluster_unlock_cbk);
+}
+
+int32_t
+__glusterd_stage_op_cbk (struct rpc_req *req, struct iovec *iov,
                           int count, void *myframe)
 {
         gd1_mgmt_stage_op_rsp         rsp   = {{0},};
@@ -646,6 +888,7 @@ glusterd_stage_op_cbk (struct rpc_req *req, struct iovec *iov,
         char                          err_str[2048] = {0};
         char                          *peer_str = NULL;
         xlator_t                      *this = NULL;
+        uuid_t                        *txn_id = NULL;
 
         this = THIS;
         GF_ASSERT (this);
@@ -698,6 +941,10 @@ out:
                 "Received stage %s from uuid: %s",
                 (op_ret) ? "RJT" : "ACC", uuid_utoa (rsp.uuid));
 
+        ret = dict_get_bin (dict, "transaction_id", (void **)&txn_id);
+
+        gf_log ("", GF_LOG_DEBUG, "transaction ID = %s", uuid_utoa (*txn_id));
+
         ret = glusterd_friend_find (rsp.uuid, NULL, &peerinfo);
 
         if (ret) {
@@ -733,7 +980,7 @@ out:
                 break;
         }
 
-        ret = glusterd_op_sm_inject_event (event_type, NULL);
+        ret = glusterd_op_sm_inject_event (event_type, txn_id, NULL);
 
         if (!ret) {
                 glusterd_friend_sm ();
@@ -753,7 +1000,15 @@ out:
 }
 
 int32_t
-glusterd_commit_op_cbk (struct rpc_req *req, struct iovec *iov,
+glusterd_stage_op_cbk (struct rpc_req *req, struct iovec *iov,
+                          int count, void *myframe)
+{
+        return glusterd_big_locked_cbk (req, iov, count, myframe,
+                                        __glusterd_stage_op_cbk);
+}
+
+int32_t
+__glusterd_commit_op_cbk (struct rpc_req *req, struct iovec *iov,
                           int count, void *myframe)
 {
         gd1_mgmt_commit_op_rsp         rsp   = {{0},};
@@ -765,6 +1020,8 @@ glusterd_commit_op_cbk (struct rpc_req *req, struct iovec *iov,
         char                          err_str[2048] = {0};
         char                          *peer_str = NULL;
         xlator_t                      *this = NULL;
+        uuid_t                        *txn_id = NULL;
+
 
         this = THIS;
         GF_ASSERT (this);
@@ -818,6 +1075,10 @@ glusterd_commit_op_cbk (struct rpc_req *req, struct iovec *iov,
                 "Received commit %s from uuid: %s",
                 (op_ret)?"RJT":"ACC", uuid_utoa (rsp.uuid));
 
+        ret = dict_get_bin (dict, "transaction_id", (void **)&txn_id);
+
+        gf_log ("", GF_LOG_DEBUG, "transaction ID = %s", uuid_utoa (*txn_id));
+
         ret = glusterd_friend_find (rsp.uuid, NULL, &peerinfo);
 
         if (ret) {
@@ -897,7 +1158,7 @@ glusterd_commit_op_cbk (struct rpc_req *req, struct iovec *iov,
         }
 
 out:
-        ret = glusterd_op_sm_inject_event (event_type, NULL);
+        ret = glusterd_op_sm_inject_event (event_type, txn_id, NULL);
 
         if (!ret) {
                 glusterd_friend_sm ();
@@ -911,7 +1172,13 @@ out:
         return ret;
 }
 
-
+int32_t
+glusterd_commit_op_cbk (struct rpc_req *req, struct iovec *iov,
+                          int count, void *myframe)
+{
+        return glusterd_big_locked_cbk (req, iov, count, myframe,
+                                        __glusterd_commit_op_cbk);
+}
 
 int32_t
 glusterd_rpc_probe (call_frame_t *frame, xlator_t *this,
@@ -1128,6 +1395,134 @@ out:
 }
 
 int32_t
+glusterd_mgmt_v3_lock_peers (call_frame_t *frame, xlator_t *this,
+                             void *data)
+{
+        gd1_mgmt_v3_lock_req             req         = {{0},};
+        int                              ret         = -1;
+        glusterd_peerinfo_t             *peerinfo    = NULL;
+        glusterd_conf_t                 *priv        = NULL;
+        call_frame_t                    *dummy_frame = NULL;
+        dict_t                          *dict        = NULL;
+        uuid_t                          *txn_id      = NULL;
+
+        if (!this)
+                goto out;
+
+        dict = data;
+
+        priv = this->private;
+        GF_ASSERT (priv);
+
+        ret = dict_get_ptr (dict, "peerinfo", VOID (&peerinfo));
+        if (ret)
+                goto out;
+
+        //peerinfo should not be in payload
+        dict_del (dict, "peerinfo");
+
+        glusterd_get_uuid (&req.uuid);
+
+        ret = dict_allocate_and_serialize (dict, &req.dict.dict_val,
+                                           &req.dict.dict_len);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to serialize dict "
+                        "to request buffer");
+                goto out;
+        }
+
+        /* Sending valid transaction ID to peers */
+        ret = dict_get_bin (dict, "transaction_id",
+                            (void **)&txn_id);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                       "Failed to get transaction id.");
+                goto out;
+        } else {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "Transaction_id = %s", uuid_utoa (*txn_id));
+                uuid_copy (req.txn_id, *txn_id);
+        }
+
+        dummy_frame = create_frame (this, this->ctx->pool);
+        if (!dummy_frame)
+                goto out;
+
+        ret = glusterd_submit_request (peerinfo->rpc, &req, dummy_frame,
+                                       peerinfo->mgmt_v3,
+                                       GLUSTERD_MGMT_V3_LOCK, NULL,
+                                       this, glusterd_mgmt_v3_lock_peers_cbk,
+                                       (xdrproc_t)xdr_gd1_mgmt_v3_lock_req);
+out:
+        gf_log (this->name, GF_LOG_DEBUG, "Returning %d", ret);
+        return ret;
+}
+
+int32_t
+glusterd_mgmt_v3_unlock_peers (call_frame_t *frame, xlator_t *this,
+                               void *data)
+{
+        gd1_mgmt_v3_unlock_req           req         = {{0},};
+        int                              ret         = -1;
+        glusterd_peerinfo_t             *peerinfo    = NULL;
+        glusterd_conf_t                 *priv        = NULL;
+        call_frame_t                    *dummy_frame = NULL;
+        dict_t                          *dict        = NULL;
+        uuid_t                          *txn_id      = NULL;
+
+        if (!this)
+                goto out;
+
+        dict = data;
+
+        priv = this->private;
+        GF_ASSERT (priv);
+
+        ret = dict_get_ptr (dict, "peerinfo", VOID (&peerinfo));
+        if (ret)
+                goto out;
+
+        //peerinfo should not be in payload
+        dict_del (dict, "peerinfo");
+
+        glusterd_get_uuid (&req.uuid);
+
+        ret = dict_allocate_and_serialize (dict, &req.dict.dict_val,
+                                           &req.dict.dict_len);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to serialize dict "
+                        "to request buffer");
+                goto out;
+        }
+
+        /* Sending valid transaction ID to peers */
+        ret = dict_get_bin (dict, "transaction_id",
+                            (void **)&txn_id);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                       "Failed to get transaction id.");
+                goto out;
+        } else {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "Transaction_id = %s", uuid_utoa (*txn_id));
+                uuid_copy (req.txn_id, *txn_id);
+        }
+
+        dummy_frame = create_frame (this, this->ctx->pool);
+        if (!dummy_frame)
+                goto out;
+
+        ret = glusterd_submit_request (peerinfo->rpc, &req, dummy_frame,
+                                       peerinfo->mgmt_v3,
+                                       GLUSTERD_MGMT_V3_UNLOCK, NULL,
+                                       this, glusterd_mgmt_v3_unlock_peers_cbk,
+                                       (xdrproc_t)xdr_gd1_mgmt_v3_unlock_req);
+out:
+        gf_log (this->name, GF_LOG_DEBUG, "Returning %d", ret);
+        return ret;
+}
+
+int32_t
 glusterd_cluster_unlock (call_frame_t *frame, xlator_t *this,
                             void *data)
 {
@@ -1276,7 +1671,7 @@ out:
 }
 
 int32_t
-glusterd_brick_op_cbk (struct rpc_req *req, struct iovec *iov,
+__glusterd_brick_op_cbk (struct rpc_req *req, struct iovec *iov,
                           int count, void *myframe)
 {
         gd1_mgmt_brick_op_rsp         rsp   = {0};
@@ -1290,6 +1685,7 @@ glusterd_brick_op_cbk (struct rpc_req *req, struct iovec *iov,
         glusterd_req_ctx_t            *req_ctx = NULL;
         glusterd_pending_node_t       *node = NULL;
         xlator_t                      *this = NULL;
+        uuid_t                        *txn_id = &global_txn_id;
 
         this = THIS;
         GF_ASSERT (this);
@@ -1352,6 +1748,11 @@ glusterd_brick_op_cbk (struct rpc_req *req, struct iovec *iov,
                 }
         }
 out:
+
+        ret = dict_get_bin (req_ctx->dict, "transaction_id", (void **)&txn_id);
+
+        gf_log ("", GF_LOG_DEBUG, "transaction ID = %s", uuid_utoa (*txn_id));
+
         ev_ctx = GF_CALLOC (1, sizeof (*ev_ctx), gf_gld_mt_brick_rsp_ctx_t);
         GF_ASSERT (ev_ctx);
         if (op_ret) {
@@ -1364,7 +1765,7 @@ out:
         ev_ctx->pending_node = frame->cookie;
         ev_ctx->rsp_dict  = dict;
         ev_ctx->commit_ctx = frame->local;
-        ret = glusterd_op_sm_inject_event (event_type, ev_ctx);
+        ret = glusterd_op_sm_inject_event (event_type, txn_id, ev_ctx);
         if (!ret) {
                 glusterd_friend_sm ();
                 glusterd_op_sm ();
@@ -1378,9 +1779,18 @@ out:
 }
 
 int32_t
+glusterd_brick_op_cbk (struct rpc_req *req, struct iovec *iov,
+                          int count, void *myframe)
+{
+        return glusterd_big_locked_cbk (req, iov, count, myframe,
+                                        __glusterd_brick_op_cbk);
+}
+
+int32_t
 glusterd_brick_op (call_frame_t *frame, xlator_t *this,
                       void *data)
 {
+
         gd1_mgmt_brick_op_req           *req = NULL;
         int                             ret = 0;
         glusterd_conf_t                 *priv = NULL;
@@ -1391,6 +1801,7 @@ glusterd_brick_op (call_frame_t *frame, xlator_t *this,
         glusterd_req_ctx_t              *req_ctx = NULL;
         struct rpc_clnt                 *rpc = NULL;
         dict_t                          *op_ctx = NULL;
+        uuid_t                          *txn_id = &global_txn_id;
 
         if (!this) {
                 ret = -1;
@@ -1413,6 +1824,11 @@ glusterd_brick_op (call_frame_t *frame, xlator_t *this,
                 goto out;
         }
 
+
+        ret = dict_get_bin (req_ctx->dict, "transaction_id", (void **)&txn_id);
+
+        gf_log ("", GF_LOG_DEBUG, "transaction ID = %s", uuid_utoa (*txn_id));
+
         list_for_each_entry (pending_node, &opinfo.pending_bricks, list) {
                 dummy_frame = create_frame (this, this->ctx->pool);
                 if (!dummy_frame)
@@ -1490,7 +1906,8 @@ glusterd_brick_op (call_frame_t *frame, xlator_t *this,
 
 out:
         if (ret) {
-                glusterd_op_sm_inject_event (GD_OP_EVENT_RCVD_RJT, data);
+                glusterd_op_sm_inject_event (GD_OP_EVENT_RCVD_RJT,
+                                             txn_id, data);
                 opinfo.op_ret = ret;
         }
         gf_log (this->name, GF_LOG_DEBUG, "Returning %d", ret);
@@ -1518,6 +1935,12 @@ struct rpc_clnt_procedure gd_mgmt_actors[GLUSTERD_MGMT_MAXVALUE] = {
         [GLUSTERD_MGMT_COMMIT_OP]      = {"COMMIT_OP", glusterd_commit_op},
 };
 
+struct rpc_clnt_procedure gd_mgmt_v3_actors[GLUSTERD_MGMT_V3_MAXVALUE] = {
+        [GLUSTERD_MGMT_V3_NULL]           = {"NULL", NULL },
+        [GLUSTERD_MGMT_V3_LOCK]           = {"MGMT_V3_LOCK", glusterd_mgmt_v3_lock_peers},
+        [GLUSTERD_MGMT_V3_UNLOCK]         = {"MGMT_V3_UNLOCK", glusterd_mgmt_v3_unlock_peers},
+};
+
 struct rpc_clnt_program gd_mgmt_prog = {
         .progname  = "glusterd mgmt",
         .prognum   = GD_MGMT_PROGRAM,
@@ -1542,3 +1965,10 @@ struct rpc_clnt_program gd_peer_prog = {
         .numproc   = GLUSTERD_FRIEND_MAXVALUE,
 };
 
+struct rpc_clnt_program gd_mgmt_v3_prog = {
+        .progname  = "glusterd mgmt v3",
+        .prognum   = GD_MGMT_V3_PROGRAM,
+        .progver   = GD_MGMT_V3_VERSION,
+        .proctable = gd_mgmt_v3_actors,
+        .numproc   = GLUSTERD_MGMT_V3_MAXVALUE,
+};
diff --git a/xlators/mgmt/glusterd/src/glusterd-sm.c b/xlators/mgmt/glusterd/src/glusterd-sm.c
index 5a38fdfec..c671edf68 100644
--- a/xlators/mgmt/glusterd/src/glusterd-sm.c
+++ b/xlators/mgmt/glusterd/src/glusterd-sm.c
@@ -400,7 +400,8 @@ glusterd_ac_send_friend_remove_req (glusterd_friend_sm_event_t *event,
                 if (ctx)
                         ret = glusterd_xfer_cli_deprobe_resp (ctx->req, ret, 0,
                                                               NULL,
-                                                              ctx->hostname);
+                                                              ctx->hostname,
+                                                              ctx->dict);
                 glusterd_friend_sm ();
                 glusterd_op_sm ();
 
@@ -650,7 +651,8 @@ glusterd_ac_handle_friend_add_req (glusterd_friend_sm_event_t *event, void *ctx)
         uuid_copy (peerinfo->uuid, ev_ctx->uuid);
 
         //Build comparison logic here.
-        ret = glusterd_compare_friend_data (ev_ctx->vols, &status);
+        ret = glusterd_compare_friend_data (ev_ctx->vols, &status,
+                                            peerinfo->hostname);
         if (ret)
                 goto out;
 
@@ -687,7 +689,8 @@ glusterd_ac_handle_friend_add_req (glusterd_friend_sm_event_t *event, void *ctx)
         glusterd_friend_sm_inject_event (new_event);
 
         ret = glusterd_xfer_friend_add_resp (ev_ctx->req, ev_ctx->hostname,
-                                             ev_ctx->port, op_ret, op_errno);
+                                             peerinfo->hostname, ev_ctx->port,
+                                             op_ret, op_errno);
 
 out:
         gf_log ("", GF_LOG_DEBUG, "Returning with %d", ret);
@@ -1075,8 +1078,25 @@ glusterd_friend_sm ()
 
         ret = 0;
 out:
-        if (quorum_action)
+        if (quorum_action) {
+            /* When glusterd is restarted, it needs to wait until the 'friends' view
+             * of the volumes settle, before it starts any of the internal daemons.
+             *
+             * Every friend that was part of the cluster, would send its
+             * cluster-view, 'our' way. For every friend, who belongs to
+             * a partition which has a different cluster-view from our
+             * partition, we may update our cluster-view. For subsequent
+             * friends from that partition would agree with us, if the first
+             * friend wasn't rejected. For every first friend, whom we agreed with,
+             * we would need to start internal daemons/bricks belonging to the
+             * new volumes.
+             * glusterd_spawn_daemons calls functions that are idempotent. ie,
+             * the functions spawn process(es) only if they are not started yet.
+             *
+             * */
+                glusterd_spawn_daemons (NULL);
                 glusterd_do_quorum_action ();
+        }
         return ret;
 }
 
diff --git a/xlators/mgmt/glusterd/src/glusterd-sm.h b/xlators/mgmt/glusterd/src/glusterd-sm.h
index 0af45deb6..b9bedbe69 100644
--- a/xlators/mgmt/glusterd/src/glusterd-sm.h
+++ b/xlators/mgmt/glusterd/src/glusterd-sm.h
@@ -27,14 +27,7 @@
 #include "byte-order.h"
 //#include "glusterd.h"
 #include "rpcsvc.h"
-
-struct glusterd_store_handle_ {
-        char    *path;
-        int     fd;
-        FILE    *read;
-};
-
-typedef struct glusterd_store_handle_  glusterd_store_handle_t;
+#include "store.h"
 
 typedef enum gd_quorum_contribution_ {
         QUORUM_NONE,
@@ -93,7 +86,9 @@ typedef struct glusterd_sm_tr_log_ {
 
 struct glusterd_peerinfo_ {
         uuid_t                          uuid;
-        char                            uuid_str[50];
+        char                            uuid_str[50]; /* Retrieve this using
+                                                       * gd_peer_uuid_str ()
+                                                       */
         glusterd_peer_state_info_t      state;
         char                            *hostname;
         int                             port;
@@ -102,11 +97,13 @@ struct glusterd_peerinfo_ {
         struct rpc_clnt                 *rpc;
         rpc_clnt_prog_t                 *mgmt;
         rpc_clnt_prog_t                 *peer;
+        rpc_clnt_prog_t                 *mgmt_v3;
         int                             connected;
-        glusterd_store_handle_t         *shandle;
+        gf_store_handle_t         *shandle;
         glusterd_sm_tr_log_t            sm_log;
         gf_boolean_t                    quorum_action;
         gd_quorum_contrib_t             quorum_contrib;
+        gf_boolean_t                    locked;
 };
 
 typedef struct glusterd_peerinfo_ glusterd_peerinfo_t;
@@ -120,6 +117,7 @@ typedef enum glusterd_ev_gen_mode_ {
 typedef struct glusterd_peer_ctx_args_ {
         rpcsvc_request_t        *req;
         glusterd_ev_gen_mode_t  mode;
+        dict_t                  *dict;
 } glusterd_peerctx_args_t;
 
 typedef struct glusterd_peer_ctx_ {
@@ -186,6 +184,7 @@ typedef struct glusterd_probe_ctx_ {
         char                    *hostname;
         rpcsvc_request_t        *req;
         int                      port;
+        dict_t                  *dict;
 } glusterd_probe_ctx_t;
 int
 glusterd_friend_sm_new_event (glusterd_friend_sm_event_type_t event_type,
diff --git a/xlators/mgmt/glusterd/src/glusterd-snapshot.c b/xlators/mgmt/glusterd/src/glusterd-snapshot.c
new file mode 100644
index 000000000..9b811cd05
--- /dev/null
+++ b/xlators/mgmt/glusterd/src/glusterd-snapshot.c
@@ -0,0 +1,5590 @@
+/*
+   Copyright (c) 2013-2014 Red Hat, Inc. <http://www.redhat.com>
+   This file is part of GlusterFS.
+
+   This file is licensed to you under your choice of the GNU Lesser
+   General Public License, version 3 or any later version (LGPLv3 or
+   later), or the GNU General Public License, version 2 (GPLv2), in all
+   cases as published by the Free Software Foundation.
+*/
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+
+#include <inttypes.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <sys/resource.h>
+#include <sys/statvfs.h>
+#include <sys/mount.h>
+
+#include "globals.h"
+#include "compat.h"
+#include "protocol-common.h"
+#include "xlator.h"
+#include "logging.h"
+#include "timer.h"
+#include "glusterd-mem-types.h"
+#include "glusterd.h"
+#include "glusterd-sm.h"
+#include "glusterd-op-sm.h"
+#include "glusterd-utils.h"
+#include "glusterd-store.h"
+#include "run.h"
+#include "glusterd-volgen.h"
+#include "glusterd-mgmt.h"
+#include "glusterd-syncop.h"
+
+#include "syscall.h"
+#include "cli1-xdr.h"
+#include "xdr-generic.h"
+
+#ifdef GF_LINUX_HOST_OS
+#include <mntent.h>
+#endif
+
+char snap_mount_folder[PATH_MAX];
+
+static int32_t
+glusterd_find_missed_snap (dict_t *rsp_dict, glusterd_volinfo_t *vol,
+                           char *snap_uuid, struct list_head *peers,
+                           int32_t op);
+
+/* This function will restore a snapshot volumes
+ *
+ * @param dict          dictionary containing snapshot restore request
+ * @param op_errstr     In case of any failure error message will be returned
+ *                      in this variable
+ * @return              Negative value on Failure and 0 in success
+ */
+int
+glusterd_snapshot_restore (dict_t *dict, char **op_errstr, dict_t *rsp_dict)
+{
+        int                     ret             = -1;
+        char                    *volname        = NULL;
+        char                    *snapname       = NULL;
+        xlator_t                *this           = NULL;
+        glusterd_volinfo_t      *snap_volinfo   = NULL;
+        glusterd_volinfo_t      *volinfo        = NULL;
+        glusterd_snap_t         *snap           = NULL;
+        glusterd_conf_t         *priv           = NULL;
+
+        this = THIS;
+
+        GF_ASSERT (this);
+        GF_ASSERT (dict);
+        GF_ASSERT (op_errstr);
+        GF_ASSERT (rsp_dict);
+
+        priv = this->private;
+        GF_ASSERT (priv);
+
+        ret = dict_get_str (dict, "snapname", &snapname);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to get "
+                        "snap name");
+                goto out;
+        }
+
+        snap = glusterd_find_snap_by_name (snapname);
+        if (NULL == snap) {
+                ret = gf_asprintf (op_errstr, "Snap (%s) not found",
+                                        snapname);
+                if (ret < 0) {
+                        goto out;
+                }
+                gf_log (this->name, GF_LOG_ERROR, "%s", *op_errstr);
+                ret = -1;
+                goto out;
+        }
+
+        /* TODO : As of now there is only volume in snapshot.
+         * Change this when multiple volume snapshot is introduced
+         */
+        snap_volinfo = list_entry (snap->volumes.next, glusterd_volinfo_t,
+                                   vol_list);
+
+        ret = glusterd_volinfo_find (snap_volinfo->parent_volname, &volinfo);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Could not get volinfo of "
+                        "%s", snap_volinfo->parent_volname);
+                goto out;
+        }
+
+        if (is_origin_glusterd (dict) == _gf_true) {
+                /* From origin glusterd check if      *
+                 * any peers with snap bricks is down */
+                ret = glusterd_find_missed_snap (rsp_dict, snap_volinfo,
+                                                 snap_volinfo->volname,
+                                                 &priv->peers,
+                                                 GF_SNAP_OPTION_TYPE_RESTORE);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Failed to find missed snap restores");
+                        goto out;
+                }
+        }
+
+        ret = gd_restore_snap_volume (rsp_dict, volinfo, snap_volinfo);
+        if (ret) {
+                /* No need to update op_errstr because it is assumed
+                 * that the called function will do that in case of
+                 * failure.
+                 */
+                gf_log (this->name, GF_LOG_ERROR, "Failed to restore "
+                        "snap for %s volume", volname);
+                goto out;
+        }
+
+        ret = 0;
+
+        /* TODO: Need to check if we need to delete the snap after the
+         * operation is successful or not. Also need to persist the state
+         * of restore operation in the store.
+         */
+out:
+        return ret;
+}
+
+/* This function is called before actual restore is taken place. This function
+ * will validate whether the snapshot volumes are ready to be restored or not.
+ *
+ * @param dict          dictionary containing snapshot restore request
+ * @param op_errstr     In case of any failure error message will be returned
+ *                      in this variable
+ * @param rsp_dict      response dictionary
+ * @return              Negative value on Failure and 0 in success
+ */
+int
+glusterd_snapshot_restore_prevalidate (dict_t *dict, char **op_errstr,
+                                       dict_t *rsp_dict)
+{
+        int                     ret             = -1;
+        int32_t                 i               = 0;
+        int32_t                 volcount        = 0;
+        gf_boolean_t            snap_restored   = _gf_false;
+        char                    key[PATH_MAX]   = {0, };
+        char                    *volname        = NULL;
+        char                    *snapname       = NULL;
+        glusterd_volinfo_t      *volinfo        = NULL;
+        glusterd_snap_t         *snap           = NULL;
+        xlator_t                *this           = NULL;
+
+        this = THIS;
+
+        GF_ASSERT (this);
+        GF_ASSERT (dict);
+        GF_ASSERT (op_errstr);
+        GF_ASSERT (rsp_dict);
+
+        ret = dict_get_str (dict, "snapname", &snapname);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to get "
+                        "snap name");
+                goto out;
+        }
+
+        snap = glusterd_find_snap_by_name (snapname);
+        if (NULL == snap) {
+                ret = gf_asprintf (op_errstr, "Snap (%s) not found",
+                                snapname);
+                if (ret < 0) {
+                        goto out;
+                }
+                gf_log (this->name, GF_LOG_ERROR, "%s", *op_errstr);
+                ret = -1;
+                goto out;
+        }
+
+        snap_restored = snap->snap_restored;
+
+        if (snap_restored) {
+                ret = gf_asprintf (op_errstr, "Snap (%s) is already "
+                                  "restored", snapname);
+                if (ret < 0) {
+                        goto out;
+                }
+                gf_log (this->name, GF_LOG_ERROR, "%s", *op_errstr);
+                ret = -1;
+                goto out;
+        }
+
+        ret = dict_set_str (rsp_dict, "snapname", snapname);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to set "
+                        "snap name");
+                goto out;
+        }
+
+        ret = dict_get_int32 (dict, "volcount", &volcount);
+
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to get volume count");
+                goto out;
+        }
+
+        /* Snapshot restore will only work if all the volumes,
+           that are part of the snapshot, are stopped. */
+        for (i = 1; i <= volcount; ++i) {
+                snprintf (key, sizeof (key), "volname%d", i);
+                ret = dict_get_str (dict, key, &volname);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR, "Failed to "
+                                "get volume name");
+                        goto out;
+                }
+
+                ret = glusterd_volinfo_find (volname, &volinfo);
+                if (ret) {
+                        ret = gf_asprintf (op_errstr, "Volume (%s) not found",
+                                           volname);
+                        if (ret < 0) {
+                                goto out;
+                        }
+                        gf_log (this->name, GF_LOG_ERROR, "%s", *op_errstr);
+                        ret = -1;
+                        goto out;
+                }
+
+                if (glusterd_is_volume_started (volinfo)) {
+                        ret = gf_asprintf (op_errstr, "Volume (%s) has been "
+                        "started. Volume needs to be stopped before restoring "
+                        "a snapshot.", volname);
+                        if (ret < 0) {
+                                goto out;
+                        }
+                        gf_log (this->name, GF_LOG_ERROR, "%s", *op_errstr);
+                        ret = -1;
+                        goto out;
+                }
+        }
+
+        ret = 0;
+out:
+        return ret;
+}
+
+int
+snap_max_hard_limits_validate (dict_t *dict, char *volname,
+                          uint64_t value, char **op_errstr)
+{
+        char                err_str[PATH_MAX] = "";
+        glusterd_conf_t    *conf              = NULL;
+        glusterd_volinfo_t *volinfo           = NULL;
+        int                 ret               = -1;
+        uint64_t            max_limit         = GLUSTERD_SNAPS_MAX_HARD_LIMIT;
+        xlator_t           *this              = NULL;
+
+        this = THIS;
+
+        GF_ASSERT (this);
+        GF_ASSERT (dict);
+        GF_ASSERT (op_errstr);
+
+        conf = this->private;
+
+        GF_ASSERT (conf);
+
+        if (volname) {
+                ret = glusterd_volinfo_find (volname, &volinfo);
+                if (!ret) {
+                        if (volinfo->is_snap_volume) {
+                                ret = -1;
+                                snprintf (err_str, PATH_MAX,
+                                         "%s is a snap volume. Configuring "
+                                         "snap-max-hard-limit for a snap "
+                                         "volume is prohibited.", volname);
+                                goto out;
+                        }
+                }
+        }
+
+        if (value) {
+                /* Max limit for the system is GLUSTERD_SNAPS_MAX_HARD_LIMIT
+                 * but max limit for a volume is conf->snap_max_hard_limit.
+                 */
+                if (volname) {
+                        max_limit = conf->snap_max_hard_limit;
+                } else {
+                        max_limit = GLUSTERD_SNAPS_MAX_HARD_LIMIT;
+                }
+        }
+
+        if ((value < 0) || (value > max_limit)) {
+                ret = -1;
+                snprintf (err_str, PATH_MAX, "Invalid snap-max-hard-limit"
+                          "%"PRIu64 ". Expected range 0 - %"PRIu64,
+                          value, max_limit);
+                goto out;
+        }
+
+        ret = 0;
+out:
+        if (ret) {
+                *op_errstr = gf_strdup (err_str);
+                gf_log (this->name, GF_LOG_ERROR, "%s", err_str);
+        }
+        return ret;
+}
+
+int
+glusterd_snapshot_config_prevalidate (dict_t *dict, char **op_errstr)
+{
+        char               *volname             = NULL;
+        glusterd_volinfo_t *volinfo             = NULL;
+        xlator_t           *this                = NULL;
+        int                 ret                 = -1;
+        int                 config_command      = 0;
+        char                err_str[PATH_MAX]   = {0,};
+        glusterd_conf_t    *conf                = NULL;
+        uint64_t            value               = 0;
+        uint64_t            hard_limit          = 0;
+        uint64_t            soft_limit          = 0;
+        gf_loglevel_t       loglevel            = GF_LOG_ERROR;
+        uint64_t            max_limit           = GLUSTERD_SNAPS_MAX_HARD_LIMIT;
+
+        this = THIS;
+
+        GF_ASSERT (this);
+        GF_ASSERT (dict);
+        GF_ASSERT (op_errstr);
+
+        conf = this->private;
+
+        GF_ASSERT (conf);
+
+        ret = dict_get_int32 (dict, "config-command", &config_command);
+        if (ret) {
+                snprintf (err_str, sizeof (err_str),
+                          "failed to get config-command type");
+                goto out;
+        }
+
+        ret = dict_get_uint64 (dict, "snap-max-hard-limit", &hard_limit);
+
+        ret = dict_get_uint64 (dict, "snap-max-soft-limit", &soft_limit);
+
+        ret = dict_get_str (dict, "volname", &volname);
+
+        if (volname) {
+                ret = glusterd_volinfo_find (volname, &volinfo);
+                if (ret) {
+                        snprintf (err_str, sizeof (err_str),
+                                  "Volume %s does not exist.", volname);
+                        goto out;
+                }
+        }
+
+        switch (config_command) {
+        case GF_SNAP_CONFIG_TYPE_SET:
+                if (hard_limit) {
+                        /* Validations for snap-max-hard-limits */
+                        ret = snap_max_hard_limits_validate (dict, volname,
+                                                         hard_limit, op_errstr);
+                        if (ret) {
+                                gf_log (this->name, GF_LOG_ERROR,
+                                        "snap-max-hard-limit validation "
+                                        "failed.");
+                                goto out;
+                        }
+                }
+
+                if (soft_limit) {
+                        max_limit = GLUSTERD_SNAPS_MAX_SOFT_LIMIT_PERCENT;
+                        if ((soft_limit < 0) || (soft_limit > max_limit)) {
+                                ret = -1;
+                                snprintf (err_str, PATH_MAX, "Invalid "
+                                         "snap-max-soft-limit ""%"
+                                         PRIu64 ". Expected range 0 - %"PRIu64,
+                                         value, max_limit);
+                                goto out;
+                        }
+                        break;
+                }
+        default:
+                break;
+        }
+
+        ret = 0;
+out:
+
+        if (ret && err_str[0] != '\0') {
+                gf_log (this->name, loglevel, "%s", err_str);
+                *op_errstr = gf_strdup (err_str);
+        }
+
+        return ret;
+}
+
+int
+glusterd_snap_create_pre_val_use_rsp_dict (dict_t *dst, dict_t *src)
+{
+        char                  *snap_brick_dir        = NULL;
+        char                  *snap_device           = NULL;
+        char                  *tmpstr                = NULL;
+        char                   key[PATH_MAX]         = "";
+        char                   snapbrckcnt[PATH_MAX] = "";
+        char                   snapbrckord[PATH_MAX] = "";
+        int                    ret                   = -1;
+        int64_t                i                     = -1;
+        int64_t                j                     = -1;
+        int64_t                volume_count          = 0;
+        int64_t                brick_count           = 0;
+        int64_t                brick_order           = 0;
+        xlator_t              *this                  = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (dst);
+        GF_ASSERT (src);
+
+        ret = dict_get_int64 (src, "volcount", &volume_count);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "failed to "
+                        "get the volume count");
+                goto out;
+        }
+
+        for (i = 0; i < volume_count; i++) {
+                memset (snapbrckcnt, '\0', sizeof(snapbrckcnt));
+                ret = snprintf (snapbrckcnt, sizeof(snapbrckcnt) - 1,
+                                "vol%ld_brickcount", i+1);
+                ret = dict_get_int64 (src, snapbrckcnt, &brick_count);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_TRACE,
+                                "No bricks for this volume in this dict");
+                        continue;
+                }
+
+                for (j = 0; j < brick_count; j++) {
+                        /* Fetching data from source dict */
+                        snprintf (key, sizeof(key) - 1,
+                                  "vol%ld.brickdir%ld", i+1, j);
+
+                        ret = dict_get_ptr (src, key,
+                                            (void **)&snap_brick_dir);
+                        if (ret) {
+                                gf_log (this->name, GF_LOG_WARNING,
+                                        "Unable to fetch %s", key);
+                                continue;
+                        }
+
+                        snprintf (key, sizeof(key) - 1,
+                                  "vol%ld.brick_snapdevice%ld", i+1, j);
+
+                        ret = dict_get_ptr (src, key,
+                                            (void **)&snap_device);
+                        if (ret) {
+                                gf_log (this->name, GF_LOG_ERROR,
+                                        "Unable to fetch snap_device");
+                                goto out;
+                        }
+
+                        snprintf (snapbrckord, sizeof(snapbrckord) - 1,
+                                  "vol%ld.brick%ld.order", i+1, j);
+
+                        ret = dict_get_int64 (src, snapbrckord, &brick_order);
+                        if (ret) {
+                                gf_log (this->name, GF_LOG_ERROR,
+                                        "Failed to get brick order");
+                                goto out;
+                        }
+
+                        /* Adding the data in the dst dict */
+                        snprintf (key, sizeof(key) - 1,
+                                  "vol%ld.brickdir%ld", i+1, brick_order);
+
+                        tmpstr = gf_strdup (snap_brick_dir);
+                        if (!tmpstr) {
+                                gf_log (this->name, GF_LOG_ERROR,
+                                        "Out Of Memory");
+                                ret = -1;
+                                goto out;
+                        }
+                        ret = dict_set_dynstr (dst, key, tmpstr);
+                        if (ret) {
+                                gf_log (this->name, GF_LOG_ERROR,
+                                        "Failed to set %s", key);
+                                GF_FREE (tmpstr);
+                                goto out;
+                        }
+
+                        snprintf (key, sizeof(key) - 1,
+                                  "vol%ld.brick_snapdevice%ld",
+                                  i+1, brick_order);
+
+                        tmpstr = gf_strdup (snap_device);
+                        if (!tmpstr) {
+                                ret = -1;
+                                goto out;
+                        }
+                        ret = dict_set_dynstr (dst, key, tmpstr);
+                        if (ret) {
+                                gf_log (this->name, GF_LOG_ERROR,
+                                        "Failed to set %s", key);
+                                GF_FREE (tmpstr);
+                                goto out;
+                        }
+
+                }
+        }
+
+        ret = 0;
+out:
+
+        gf_log (this->name, GF_LOG_TRACE, "Returning %d", ret);
+        return ret;
+}
+
+int
+glusterd_snap_pre_validate_use_rsp_dict (dict_t *dst, dict_t *src)
+{
+        int             ret             = -1;
+        int32_t         snap_command    = 0;
+        xlator_t       *this            = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+
+        if (!dst || !src) {
+                gf_log (this->name, GF_LOG_ERROR, "Source or Destination "
+                        "dict is empty.");
+                goto out;
+        }
+
+        ret = dict_get_int32 (dst, "type", &snap_command);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "unable to get the type of "
+                        "the snapshot command");
+                goto out;
+        }
+
+        switch (snap_command) {
+        case GF_SNAP_OPTION_TYPE_CREATE:
+                ret = glusterd_snap_create_pre_val_use_rsp_dict (dst, src);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR, "Unable to use "
+                                "rsp dict");
+                        goto out;
+                }
+                break;
+        default:
+                break;
+        }
+
+        ret = 0;
+out:
+        gf_log (this->name, GF_LOG_DEBUG, "Returning %d", ret);
+        return ret;
+}
+
+int
+glusterd_snapshot_create_prevalidate (dict_t *dict, char **op_errstr,
+                                      dict_t *rsp_dict)
+{
+        char                  *volname                   = NULL;
+        char                  *snapname                  = NULL;
+        char                  *device                    = NULL;
+        char                  *tmpstr                    = NULL;
+        char                  *brick_dir                 = NULL;
+        char                   snap_brick_dir[PATH_MAX]  = "";
+        char                  *mnt_pt                    = NULL;
+        char                   key[PATH_MAX]             = "";
+        char                   snap_mount[PATH_MAX]      = "";
+        char                   snap_volname[64]          = "";
+        char                   err_str[PATH_MAX]         = "";
+        int                    ret                       = -1;
+        int64_t                i                         = 0;
+        int64_t                volcount                  = 0;
+        int64_t                brick_count               = 0;
+        int64_t                brick_order               = 0;
+        glusterd_brickinfo_t  *brickinfo                 = NULL;
+        glusterd_volinfo_t    *volinfo                   = NULL;
+        xlator_t              *this                      = NULL;
+        uuid_t                *snap_volid                = NULL;
+        gf_loglevel_t          loglevel                  = GF_LOG_ERROR;
+        glusterd_conf_t       *conf                      = NULL;
+        int64_t                effective_max_limit       = 0;
+
+        this = THIS;
+        GF_ASSERT (op_errstr);
+        conf = this->private;
+        GF_ASSERT (conf);
+
+        ret = dict_get_int64 (dict, "volcount", &volcount);
+        if (ret) {
+                snprintf (err_str, sizeof (err_str), "Failed to "
+                          "get the volume count");
+                goto out;
+        }
+        if (volcount <= 0) {
+                snprintf (err_str, sizeof (err_str), "Invalid volume count %ld "
+                          "supplied", volcount);
+                ret = -1;
+                goto out;
+        }
+
+        ret = dict_get_str (dict, "snapname", &snapname);
+        if (ret) {
+                snprintf (err_str, sizeof (err_str), "Failed to get snapname");
+                goto out;
+        }
+
+        if (glusterd_find_snap_by_name (snapname)) {
+                ret = -1;
+                snprintf (err_str, sizeof (err_str), "Snap %s already exists",
+                          snapname);
+                goto out;
+        }
+
+        for (i = 1; i <= volcount; i++) {
+                snprintf (key, sizeof (key), "volname%ld", i);
+                ret = dict_get_str (dict, key, &volname);
+                if (ret) {
+                        snprintf (err_str, sizeof (err_str),
+                                  "failed to get volume name");
+                        goto out;
+                }
+                ret = glusterd_volinfo_find (volname, &volinfo);
+                if (ret) {
+                        snprintf (err_str, sizeof (err_str),
+                                  "Volume (%s) does not exist ", volname);
+                        goto out;
+                }
+
+                ret = -1;
+                if (!glusterd_is_volume_started (volinfo)) {
+                        snprintf (err_str, sizeof (err_str), "volume %s is "
+                                  "not started", volinfo->volname);
+                        loglevel = GF_LOG_WARNING;
+                        goto out;
+                }
+                if (glusterd_is_defrag_on (volinfo)) {
+                        snprintf (err_str, sizeof (err_str),
+                                  "rebalance process is running for the "
+                                  "volume %s", volname);
+                        loglevel = GF_LOG_WARNING;
+                        goto out;
+                }
+                /* TODO: Also check whether geo replication is running */
+
+                if (volinfo->is_snap_volume == _gf_true) {
+                        snprintf (err_str, sizeof (err_str),
+                                  "Volume %s is a snap volume", volname);
+                        loglevel = GF_LOG_WARNING;
+                        goto out;
+                }
+
+                if (volinfo->snap_max_hard_limit < conf->snap_max_hard_limit)
+                        effective_max_limit = volinfo->snap_max_hard_limit;
+                else
+                        effective_max_limit = conf->snap_max_hard_limit;
+
+                if (volinfo->snap_count >= effective_max_limit) {
+                        snprintf (err_str, sizeof (err_str),
+                                  "The number of existing snaps has reached "
+                                  "the effective maximum limit of %"PRIu64" ,"
+                                  "for the volume %s", effective_max_limit,
+                                  volname);
+                        loglevel = GF_LOG_WARNING;
+                        goto out;
+                }
+
+                snprintf (key, sizeof(key) - 1, "vol%ld_volid", i);
+                ret = dict_get_bin (dict, key, (void **)&snap_volid);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Unable to fetch snap_volid");
+                        goto out;
+                }
+
+                /* snap volume uuid is used as lvm snapshot name.
+                   This will avoid restrictions on snapshot names
+                   provided by user */
+                GLUSTERD_GET_UUID_NOHYPHEN (snap_volname, *snap_volid);
+
+                brick_count = 0;
+                brick_order = 0;
+                /* Adding snap bricks mount paths to the dict */
+                list_for_each_entry (brickinfo, &volinfo->bricks, brick_list) {
+                        if (uuid_compare (brickinfo->uuid, MY_UUID)) {
+                                brick_order++;
+                                continue;
+                        }
+
+                        if (!glusterd_is_brick_started (brickinfo)) {
+                                gf_log (this->name, GF_LOG_WARNING,
+                                        "brick %s:%s is not started",
+                                        brickinfo->hostname,
+                                        brickinfo->path);
+                                brick_order++;
+                                brick_count++;
+                                continue;
+                        }
+
+                        device = glusterd_get_brick_mount_details (brickinfo);
+                        if (!device) {
+                                snprintf (err_str, sizeof (err_str),
+                                          "getting device name for the brick "
+                                          "%s:%s failed", brickinfo->hostname,
+                                          brickinfo->path);
+                                ret = -1;
+                                goto out;
+                        }
+
+                        device = glusterd_build_snap_device_path (device,
+                                                                  snap_volname);
+                        if (!device) {
+                                snprintf (err_str, sizeof (err_str),
+                                          "cannot copy the snapshot device "
+                                          "name (volname: %s, snapname: %s)",
+                                          volinfo->volname, snapname);
+                                loglevel = GF_LOG_WARNING;
+                                ret = -1;
+                                goto out;
+                        }
+
+                        snprintf (key, sizeof(key),
+                                  "vol%ld.brick_snapdevice%ld", i,
+                                  brick_count);
+                        ret = dict_set_dynstr (rsp_dict, key, device);
+                        if (ret) {
+                                gf_log (this->name, GF_LOG_ERROR,
+                                        "Failed to set %s", key);
+                                GF_FREE (device);
+                                goto out;
+                        }
+
+                        ret = glusterd_get_brick_root (brickinfo->path,
+                                                       &mnt_pt);
+                        if (ret) {
+                                snprintf (err_str, sizeof (err_str),
+                                "could not get the root of the brick path %s",
+                                brickinfo->path);
+                                loglevel = GF_LOG_WARNING;
+                                goto out;
+                        }
+                        if (strncmp (brickinfo->path, mnt_pt, strlen(mnt_pt))) {
+                                snprintf (err_str, sizeof (err_str),
+                                "brick: %s brick mount: %s",
+                                 brickinfo->path, mnt_pt);
+                                loglevel = GF_LOG_WARNING;
+                                goto out;
+                        }
+
+                        brick_dir = &brickinfo->path[strlen (mnt_pt)];
+                        brick_dir++;
+
+                        snprintf (snap_brick_dir, sizeof (snap_brick_dir),
+                                  "/%s", brick_dir);
+
+                        tmpstr = gf_strdup (snap_brick_dir);
+                        if (!tmpstr) {
+                                ret = -1;
+                                goto out;
+                        }
+                        snprintf (key, sizeof(key), "vol%ld.brickdir%ld", i,
+                                  brick_count);
+                        ret = dict_set_dynstr (rsp_dict, key, tmpstr);
+                        if (ret) {
+                                gf_log (this->name, GF_LOG_ERROR,
+                                        "Failed to set %s", snap_mount);
+                                goto out;
+                        }
+                        tmpstr = NULL;
+
+                        snprintf (key, sizeof(key) - 1, "vol%ld.brick%ld.order",
+                                  i, brick_count);
+                        ret = dict_set_int64 (rsp_dict, key, brick_order);
+                        if (ret) {
+                                gf_log (this->name, GF_LOG_ERROR,
+                                        "Failed to set %s", key);
+                                goto out;
+                        }
+
+                        brick_count++;
+                        brick_order++;
+                }
+                snprintf (key, sizeof(key) - 1, "vol%ld_brickcount", i);
+                ret = dict_set_int64 (rsp_dict, key, brick_count);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR, "Failed to set %s",
+                                key);
+                        goto out;
+                }
+        }
+
+        ret = dict_set_int64 (rsp_dict, "volcount", volcount);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to set volcount");
+                goto out;
+        }
+
+        ret = 0;
+out:
+        if (ret)
+                GF_FREE (tmpstr);
+
+        if (ret && err_str[0] != '\0') {
+                gf_log (this->name, loglevel, "%s", err_str);
+                *op_errstr = gf_strdup (err_str);
+        }
+
+        gf_log (this->name, GF_LOG_TRACE, "Returning %d", ret);
+        return ret;
+}
+
+glusterd_snap_t*
+glusterd_new_snap_object()
+{
+        glusterd_snap_t        *snap    = NULL;
+
+        snap = GF_CALLOC (1, sizeof (*snap), gf_gld_mt_snap_t);
+
+        if (snap) {
+                if (LOCK_INIT (&snap->lock)) {
+                        gf_log (THIS->name, GF_LOG_ERROR, "Failed initiating"
+                                " snap lock");
+                        GF_FREE (snap);
+                        return NULL;
+                }
+
+                INIT_LIST_HEAD (&snap->snap_list);
+                INIT_LIST_HEAD (&snap->volumes);
+                snap->snapname[0] = 0;
+                snap->snap_status = GD_SNAP_STATUS_INIT;
+        }
+
+        return snap;
+
+};
+
+/* Function glusterd_list_add_snapvol adds the volinfo object (snapshot volume)
+   to the snapshot object list and to the parent volume list */
+int32_t
+glusterd_list_add_snapvol (glusterd_volinfo_t *origin_vol,
+                           glusterd_volinfo_t *snap_vol)
+{
+        int ret               = -1;
+        glusterd_snap_t *snap = NULL;
+
+        GF_VALIDATE_OR_GOTO ("glusterd", origin_vol, out);
+        GF_VALIDATE_OR_GOTO ("glusterd", snap_vol, out);
+
+        snap = snap_vol->snapshot;
+        GF_ASSERT (snap);
+
+        list_add_tail (&snap_vol->vol_list, &snap->volumes);
+        LOCK (&origin_vol->lock);
+        {
+                list_add_order (&snap_vol->snapvol_list,
+                               &origin_vol->snap_volumes,
+                               glusterd_compare_snap_vol_time);
+                origin_vol->snap_count++;
+        }
+        UNLOCK (&origin_vol->lock);
+
+        gf_log (THIS->name, GF_LOG_DEBUG, "Snap %s added to the list",
+                snap->snapname);
+        ret = 0;
+out:
+        return ret;
+}
+
+glusterd_snap_t*
+glusterd_find_snap_by_name (char *snapname)
+{
+        glusterd_snap_t *snap  = NULL;
+        glusterd_conf_t *priv  = NULL;
+
+        priv = THIS->private;
+        GF_ASSERT (priv);
+        GF_ASSERT (snapname);
+
+
+        list_for_each_entry (snap, &priv->snapshots, snap_list) {
+                if (!strcmp (snap->snapname, snapname)) {
+                        gf_log (THIS->name, GF_LOG_DEBUG, "Found "
+                                "snap %s (%s)", snap->snapname,
+                                uuid_utoa (snap->snap_id));
+                        goto out;
+                }
+        }
+        snap = NULL;
+out:
+        return snap;
+}
+
+glusterd_snap_t*
+glusterd_find_snap_by_id (uuid_t snap_id)
+{
+        glusterd_snap_t *snap  = NULL;
+        glusterd_conf_t *priv  = NULL;
+
+        priv = THIS->private;
+        GF_ASSERT (priv);
+
+        if (uuid_is_null(snap_id))
+                goto out;
+
+        list_for_each_entry (snap, &priv->snapshots, snap_list) {
+                if (!uuid_compare (snap->snap_id, snap_id)) {
+                        gf_log (THIS->name, GF_LOG_DEBUG, "Found "
+                                "snap %s (%s)", snap->snapname,
+                                uuid_utoa (snap->snap_id));
+                        goto out;
+                }
+        }
+        snap = NULL;
+out:
+        return snap;
+}
+
+int
+glusterd_do_lvm_snapshot_remove (glusterd_volinfo_t *snap_vol,
+                                 glusterd_brickinfo_t *brickinfo,
+                                 const char *mount_pt, const char *snap_device)
+{
+        int                     ret               = -1;
+        xlator_t               *this              = NULL;
+        glusterd_conf_t        *priv              = NULL;
+        runner_t                runner            = {0,};
+        char                    msg[1024]         = {0, };
+        char                    pidfile[PATH_MAX] = {0, };
+        pid_t                   pid               = -1;
+
+        this = THIS;
+        GF_ASSERT (this);
+        priv = this->private;
+        GF_ASSERT (priv);
+
+        if (!brickinfo) {
+                gf_log (this->name, GF_LOG_ERROR, "brickinfo NULL");
+                goto out;
+        }
+
+        GF_ASSERT (snap_vol);
+        GF_ASSERT (mount_pt);
+        GF_ASSERT (snap_device);
+
+        GLUSTERD_GET_BRICK_PIDFILE (pidfile, snap_vol, brickinfo, priv);
+        if (glusterd_is_service_running (pidfile, &pid)) {
+                ret = kill (pid, SIGKILL);
+                if (ret && errno != ESRCH) {
+                        gf_log (this->name, GF_LOG_ERROR, "Unable to kill pid "
+                                "%d reason : %s", pid, strerror(errno));
+                        goto out;
+                }
+        }
+
+        runinit (&runner);
+        snprintf (msg, sizeof (msg), "umount the snapshot mounted path %s",
+                  mount_pt);
+        runner_add_args (&runner, "umount", mount_pt, NULL);
+        runner_log (&runner, "", GF_LOG_DEBUG, msg);
+
+        /* We need not do synclock_unlock => runner_run => synclock_lock here.
+           Because it is needed if we are running a glusterfs process in
+           runner_run, so that when the glusterfs process started wants to
+           communicate to glusterd, glusterd wont be able to respond if it
+           has held the big lock. So we do unlock, run glusterfs process
+           (thus communicate to glusterd), lock. But since this is not a
+           glusterfs command that is being run, unlocking and then relocking
+           is not needed.
+        */
+        ret = runner_run (&runner);
+        if (ret) {
+                gf_log (this->name, GF_LOG_WARNING, "unmounting the "
+                        "path %s (brick: %s) failed (%s)", mount_pt,
+                        brickinfo->path, strerror (errno));
+                goto out;
+        }
+
+        runinit (&runner);
+        snprintf (msg, sizeof(msg), "remove snapshot of the brick %s:%s, "
+                  "device: %s", brickinfo->hostname, brickinfo->path,
+                  snap_device);
+        runner_add_args (&runner, "/sbin/lvremove", "-f", snap_device, NULL);
+        runner_log (&runner, "", GF_LOG_DEBUG, msg);
+
+        ret = runner_run (&runner);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "removing snapshot of the "
+                        "brick (%s:%s) of device %s failed",
+                        brickinfo->hostname, brickinfo->path, snap_device);
+                goto out;
+        }
+
+out:
+        return ret;
+}
+
+int32_t
+glusterd_lvm_snapshot_remove (dict_t *rsp_dict, glusterd_volinfo_t *snap_vol)
+{
+        char                 *mnt_pt        = NULL;
+        struct mntent        *entry         = NULL;
+        int32_t               brick_count   = -1;
+        int32_t               ret           = -1;
+        glusterd_brickinfo_t *brickinfo     = NULL;
+        xlator_t             *this          = NULL;
+        FILE                 *mtab          = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (rsp_dict);
+        GF_ASSERT (snap_vol);
+
+        if (!snap_vol) {
+                gf_log (this->name, GF_LOG_ERROR, "snap volinfo is NULL");
+                goto out;
+        }
+
+        brick_count = -1;
+        list_for_each_entry (brickinfo, &snap_vol->bricks, brick_list) {
+                brick_count++;
+                if (uuid_compare (brickinfo->uuid, MY_UUID))
+                        continue;
+
+                if (brickinfo->snap_status == -1) {
+                        gf_log (this->name, GF_LOG_INFO,
+                                "snapshot was pending. lvm not present "
+                                "for brick %s:%s of the snap %s.",
+                                brickinfo->hostname, brickinfo->path,
+                                snap_vol->snapshot->snapname);
+
+                        /* Adding missed delete to the dict */
+                        ret = glusterd_add_missed_snaps_to_dict
+                                                   (rsp_dict,
+                                                    snap_vol->volname,
+                                                    brickinfo,
+                                                    brick_count + 1,
+                                                    GF_SNAP_OPTION_TYPE_DELETE);
+                        if (ret) {
+                                gf_log (this->name, GF_LOG_ERROR,
+                                        "Failed to add missed snapshot info "
+                                        "for %s:%s in the rsp_dict",
+                                        brickinfo->hostname,
+                                        brickinfo->path);
+                                goto out;
+                        }
+
+                        continue;
+                }
+
+                ret = glusterd_get_brick_root (brickinfo->path, &mnt_pt);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_WARNING, "getting the root "
+                               "of the brick for volume %s (snap %s) failed ",
+                               snap_vol->volname, snap_vol->snapshot->snapname);
+                        goto out;
+                }
+
+                entry = glusterd_get_mnt_entry_info (mnt_pt, mtab);
+                if (!entry) {
+                        gf_log (this->name, GF_LOG_WARNING, "getting the mount"
+                                " entry for the brick %s:%s of the snap %s "
+                                "(volume: %s) failed", brickinfo->hostname,
+                                brickinfo->path, snap_vol->snapshot->snapname,
+                                snap_vol->volname);
+                        ret = -1;
+                        goto out;
+                }
+                ret = glusterd_do_lvm_snapshot_remove (snap_vol, brickinfo,
+                                                       mnt_pt,
+                                                       entry->mnt_fsname);
+                if (mtab)
+                        endmntent (mtab);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR, "failed to "
+                                "remove the snapshot %s (%s)",
+                                brickinfo->path, entry->mnt_fsname);
+                        goto out;
+                }
+
+        }
+
+        ret = 0;
+out:
+        return ret;
+}
+
+int32_t
+glusterd_snap_volume_remove (dict_t *rsp_dict,
+                             glusterd_volinfo_t *snap_vol,
+                             gf_boolean_t remove_lvm,
+                             gf_boolean_t force)
+{
+        int                   ret         = -1;
+        int                   save_ret    =  0;
+        glusterd_brickinfo_t *brickinfo   = NULL;
+        glusterd_volinfo_t   *origin_vol  = NULL;
+        xlator_t             *this        = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (rsp_dict);
+        GF_ASSERT (snap_vol);
+
+        if (!snap_vol) {
+                gf_log(this->name, GF_LOG_WARNING, "snap_vol in NULL");
+                ret = -1;
+                goto out;
+        }
+
+        list_for_each_entry (brickinfo, &snap_vol->bricks, brick_list) {
+                if (uuid_compare (brickinfo->uuid, MY_UUID))
+                        continue;
+
+                ret = glusterd_brick_stop (snap_vol, brickinfo, _gf_false);
+                if (ret) {
+                        gf_log(this->name, GF_LOG_WARNING, "Failed to stop "
+                               "brick for volume %s", snap_vol->volname);
+                        save_ret = ret;
+
+                        /* Continue to cleaning up the snap in case of error
+                           if force flag is enabled */
+                        if (!force)
+                                goto out;
+                }
+        }
+
+        /* Only remove the backend lvm when required */
+        if (remove_lvm) {
+                ret = glusterd_lvm_snapshot_remove (rsp_dict, snap_vol);
+                if (ret) {
+                        gf_log(this->name, GF_LOG_WARNING, "Failed to remove "
+                               "lvm snapshot volume %s", snap_vol->volname);
+                        save_ret = ret;
+                        if (!force)
+                                goto out;
+                }
+        }
+
+        ret = glusterd_store_delete_volume (snap_vol);
+        if (ret) {
+                gf_log(this->name, GF_LOG_WARNING, "Failed to remove volume %s "
+                       "from store", snap_vol->volname);
+                save_ret = ret;
+                if (!force)
+                        goto out;
+        }
+
+        if (!list_empty(&snap_vol->snapvol_list)) {
+                ret = glusterd_volinfo_find (snap_vol->parent_volname,
+                                             &origin_vol);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR, "Failed to get "
+                                "parent volinfo %s  for volume  %s",
+                                snap_vol->parent_volname, snap_vol->volname);
+                        save_ret = ret;
+                        if (!force)
+                                goto out;
+                }
+                origin_vol->snap_count--;
+        }
+
+        ret = glusterd_volinfo_delete (snap_vol);
+        if (ret) {
+                gf_log(this->name, GF_LOG_WARNING, "Failed to remove volinfo "
+                       "%s ", snap_vol->volname);
+                save_ret = ret;
+                if (!force)
+                        goto out;
+        }
+
+        if (save_ret)
+                ret = save_ret;
+out:
+        gf_log (this->name, GF_LOG_TRACE, "returning %d", ret);
+        return ret;
+}
+
+int32_t
+glusterd_snapobject_delete (glusterd_snap_t *snap)
+{
+        if (snap == NULL) {
+                gf_log(THIS->name, GF_LOG_WARNING, "snap is NULL");
+                return -1;
+        }
+
+        list_del_init (&snap->snap_list);
+        list_del_init (&snap->volumes);
+        if (LOCK_DESTROY(&snap->lock))
+                gf_log (THIS->name, GF_LOG_WARNING, "Failed destroying lock"
+                        "of snap %s", snap->snapname);
+
+        GF_FREE (snap->description);
+        GF_FREE (snap);
+
+        return 0;
+}
+
+int32_t
+glusterd_snap_remove (dict_t *rsp_dict,
+                      glusterd_snap_t *snap,
+                      gf_boolean_t remove_lvm,
+                      gf_boolean_t force)
+{
+        int                 ret       = -1;
+        int                 save_ret  =  0;
+        glusterd_volinfo_t *snap_vol  = NULL;
+        glusterd_volinfo_t *tmp       = NULL;
+        xlator_t           *this      = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (rsp_dict);
+        GF_ASSERT (snap);
+
+        if (!snap) {
+                gf_log(this->name, GF_LOG_WARNING, "snap is NULL");
+                ret = -1;
+                goto out;
+        }
+
+        list_for_each_entry_safe (snap_vol, tmp, &snap->volumes, vol_list) {
+                ret = glusterd_snap_volume_remove (rsp_dict, snap_vol,
+                                                   remove_lvm, force);
+                if (ret) {
+                        gf_log(this->name, GF_LOG_WARNING, "Failed to remove "
+                               "volinfo %s for snap %s", snap_vol->volname,
+                               snap->snapname);
+                        save_ret = ret;
+
+                        /* Continue to cleaning up the snap in case of error
+                           if force flag is enabled */
+                        if (!force)
+                                goto out;
+                }
+        }
+
+        ret = glusterd_store_delete_snap (snap);
+        if (ret) {
+                gf_log(this->name, GF_LOG_WARNING, "Failed to remove snap %s "
+                       "from store", snap->snapname);
+                save_ret = ret;
+                if (!force)
+                        goto out;
+        }
+
+        ret = glusterd_snapobject_delete (snap);
+        if (ret)
+                gf_log (this->name, GF_LOG_WARNING, "Failed to delete "
+                        "snap object %s", snap->snapname);
+
+        if (save_ret)
+                ret = save_ret;
+out:
+        gf_log (THIS->name, GF_LOG_TRACE, "returning %d", ret);
+        return ret;
+}
+
+static int
+glusterd_snapshot_get_snapvol_detail (dict_t *dict,
+                                      glusterd_volinfo_t *snap_vol,
+                                      char *keyprefix, int detail)
+{
+        int                 ret           = -1;
+        int                 snap_limit    = 0;
+        char                key[PATH_MAX] = {0,};
+        char               *value         = NULL;
+        glusterd_volinfo_t *origin_vol    = NULL;
+        glusterd_conf_t    *conf          = NULL;
+        xlator_t           *this          = NULL;
+
+        this = THIS;
+        conf = this->private;
+        GF_ASSERT (conf);
+
+        GF_ASSERT (dict);
+        GF_ASSERT (snap_vol);
+        GF_ASSERT (keyprefix);
+
+        /* Volume Name */
+        value = gf_strdup (snap_vol->volname);
+        if (!value)
+                goto out;
+
+        snprintf (key, sizeof (key), "%s.volname", keyprefix);
+        ret = dict_set_dynstr (dict, key, value);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to set "
+                        "volume name in dictionary: %s", key);
+                goto out;
+        }
+
+        /* Volume ID */
+        value = gf_strdup (uuid_utoa (snap_vol->volume_id));
+        if (NULL == value) {
+                ret = -1;
+                goto out;
+        }
+
+        snprintf (key, sizeof (key), "%s.vol-id", keyprefix);
+        ret = dict_set_dynstr (dict, key, value);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to set "
+                        "volume id in dictionary: %s", key);
+                goto out;
+        }
+        value = NULL;
+
+        /* volume status */
+        snprintf (key, sizeof (key), "%s.vol-status", keyprefix);
+        switch (snap_vol->status) {
+        case GLUSTERD_STATUS_STARTED:
+                ret = dict_set_str (dict, key, "Started");
+                break;
+        case GLUSTERD_STATUS_STOPPED:
+                ret = dict_set_str (dict, key, "Stopped");
+                break;
+        case GD_SNAP_STATUS_NONE:
+                ret = dict_set_str (dict, key, "None");
+                break;
+        default:
+                gf_log (this->name, GF_LOG_ERROR, "Invalid volume status");
+                ret = -1;
+                goto out;
+        }
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to set volume status"
+                        " in dictionary: %s", key);
+                goto out;
+        }
+
+
+        ret = glusterd_volinfo_find (snap_vol->parent_volname, &origin_vol);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "failed to get the parent "
+                        "volinfo for the volume %s", snap_vol->volname);
+                goto out;
+        }
+
+        /* Snaps available */
+        if (conf->snap_max_hard_limit < origin_vol->snap_max_hard_limit) {
+                snap_limit = conf->snap_max_hard_limit;
+                gf_log(this->name, GF_LOG_DEBUG, "system snap-max-hard-limit is"
+                       " lesser than volume snap-max-hard-limit, "
+                       "snap-max-hard-limit value is set to %d", snap_limit);
+        } else {
+                snap_limit = origin_vol->snap_max_hard_limit;
+                gf_log(this->name, GF_LOG_DEBUG, "volume snap-max-hard-limit is"
+                       " lesser than system snap-max-hard-limit, "
+                       "snap-max-hard-limit value is set to %d", snap_limit);
+        }
+
+        snprintf (key, sizeof (key), "%s.snaps-available", keyprefix);
+        if (snap_limit > origin_vol->snap_count)
+                ret = dict_set_int32 (dict, key,
+                        snap_limit - origin_vol->snap_count);
+        else
+                ret = dict_set_int32 (dict, key, 0);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Failed to set available snaps");
+                goto out;
+        }
+
+        snprintf (key, sizeof (key), "%s.snapcount", keyprefix);
+        ret = dict_set_int32 (dict, key, origin_vol->snap_count);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Could not save snapcount");
+                goto out;
+        }
+
+        if (!detail)
+                goto out;
+
+        /* Parent volume name */
+        value = gf_strdup (snap_vol->parent_volname);
+        if (!value)
+                goto out;
+
+        snprintf (key, sizeof (key), "%s.origin-volname", keyprefix);
+        ret = dict_set_dynstr (dict, key, value);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to set parent "
+                        "volume name in dictionary: %s", key);
+                goto out;
+        }
+        value = NULL;
+
+        ret = 0;
+out:
+        if (value)
+                GF_FREE (value);
+
+        return ret;
+}
+
+static int
+glusterd_snapshot_get_snap_detail (dict_t *dict, glusterd_snap_t *snap,
+                                char *keyprefix, glusterd_volinfo_t *volinfo)
+{
+        int                 ret           = -1;
+        int                 volcount      = 0;
+        char                key[PATH_MAX] = {0,};
+        char               *value         = NULL;
+        char               *timestr       = NULL;
+        struct tm          *tmptr         = NULL;
+        glusterd_volinfo_t *snap_vol      = NULL;
+        glusterd_volinfo_t *tmp_vol       = NULL;
+        xlator_t           *this          = NULL;
+
+        this = THIS;
+
+        GF_ASSERT (dict);
+        GF_ASSERT (snap);
+        GF_ASSERT (keyprefix);
+
+        /* Snap Name */
+        value = gf_strdup (snap->snapname);
+        if (!value)
+                goto out;
+
+        snprintf (key, sizeof (key), "%s.snapname", keyprefix);
+        ret = dict_set_dynstr (dict, key, value);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to set "
+                        "snap name in dictionary");
+                goto out;
+        }
+
+        /* Snap ID */
+        value = gf_strdup (uuid_utoa (snap->snap_id));
+        if (NULL == value) {
+                ret = -1;
+                goto out;
+        }
+
+        snprintf (key, sizeof (key), "%s.snap-id", keyprefix);
+        ret = dict_set_dynstr (dict, key, value);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to set "
+                                "snap id in dictionary");
+                goto out;
+        }
+        value = NULL;
+
+        tmptr = localtime (&(snap->time_stamp));
+        if (NULL == tmptr) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to convert "
+                                "time_t to *tm");
+                ret = -1;
+                goto out;
+        }
+
+        timestr = GF_CALLOC (1, PATH_MAX, gf_gld_mt_char);
+        if (NULL == timestr) {
+                ret = -1;
+                goto out;
+        }
+
+        ret = strftime (timestr, PATH_MAX, "%Y-%m-%d %H:%M:%S", tmptr);
+        if (0 == ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to convert time_t "
+                        "to string");
+                ret = -1;
+                goto out;
+        }
+
+        snprintf (key, sizeof (key), "%s.snap-time", keyprefix);
+        ret = dict_set_dynstr (dict, key, timestr);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to set "
+                                "snap time stamp in dictionary");
+                goto out;
+        }
+        timestr = NULL;
+
+        /* If snap description is provided then add that into dictionary */
+        if (NULL != snap->description) {
+                value = gf_strdup (snap->description);
+                if (NULL == value) {
+                        ret = -1;
+                        goto out;
+                }
+
+                snprintf (key, sizeof (key), "%s.snap-desc", keyprefix);
+                ret = dict_set_dynstr (dict, key, value);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR, "Failed to set "
+                                        "snap description in dictionary");
+                        goto out;
+                }
+                value = NULL;
+        }
+
+        snprintf (key, sizeof (key), "%s.snap-status", keyprefix);
+        switch (snap->snap_status) {
+        case GD_SNAP_STATUS_INIT:
+                ret = dict_set_str (dict, key, "Init");
+                break;
+        case GD_SNAP_STATUS_IN_USE:
+                ret = dict_set_str (dict, key, "In-use");
+                break;
+        case GD_SNAP_STATUS_DECOMMISSION:
+                ret = dict_set_str (dict, key, "Decommisioned");
+                break;
+        case GD_SNAP_STATUS_RESTORED:
+                ret = dict_set_str (dict, key, "Restored");
+                break;
+        case GD_SNAP_STATUS_NONE:
+                ret = dict_set_str (dict, key, "None");
+                break;
+        default:
+                gf_log (this->name, GF_LOG_ERROR, "Invalid snap status");
+                ret = -1;
+                goto out;
+        }
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to set snap status "
+                        "in dictionary");
+                goto out;
+        }
+
+        if (volinfo) {
+                volcount = 1;
+                snprintf (key, sizeof (key), "%s.vol%d", keyprefix, volcount);
+                ret = glusterd_snapshot_get_snapvol_detail (dict,
+                                                        volinfo, key, 0);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR, "Failed to "
+                                "get volume detail %s for snap %s",
+                                snap_vol->volname, snap->snapname);
+                        goto out;
+                }
+                goto done;
+        }
+
+        list_for_each_entry_safe (snap_vol, tmp_vol, &snap->volumes, vol_list) {
+                volcount++;
+                snprintf (key, sizeof (key), "%s.vol%d", keyprefix, volcount);
+                ret = glusterd_snapshot_get_snapvol_detail (dict,
+                                                        snap_vol, key, 1);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR, "Failed to "
+                                "get volume detail %s for snap %s",
+                                snap_vol->volname, snap->snapname);
+                        goto out;
+                }
+        }
+
+done:
+        snprintf (key, sizeof (key), "%s.vol-count", keyprefix);
+        ret = dict_set_int32 (dict, key, volcount);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to set %s",
+                        key);
+                goto out;
+        }
+
+        ret = 0;
+out:
+        if (value)
+                GF_FREE (value);
+
+        if (timestr)
+                GF_FREE(timestr);
+
+        return ret;
+}
+
+static int
+glusterd_snapshot_get_all_snap_info (dict_t *dict)
+{
+        int                 ret           = -1;
+        int                 snapcount     = 0;
+        char                key[PATH_MAX] = {0,};
+        glusterd_snap_t    *snap          = NULL;
+        glusterd_snap_t    *tmp_snap      = NULL;
+        glusterd_conf_t    *priv          = NULL;
+        xlator_t           *this          = NULL;
+
+        this = THIS;
+        priv = this->private;
+        GF_ASSERT (priv);
+
+        /* General parameter validation */
+        GF_ASSERT (dict);
+
+        list_for_each_entry_safe (snap, tmp_snap, &priv->snapshots, snap_list) {
+                snapcount++;
+                snprintf (key, sizeof (key), "snap%d", snapcount);
+                ret = glusterd_snapshot_get_snap_detail (dict, snap, key, NULL);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR, "Failed to get "
+                                "snapdetail for snap %s", snap->snapname);
+                        goto out;
+                }
+        }
+
+        ret = dict_set_int32 (dict, "snap-count", snapcount);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to set snapcount");
+                goto out;
+        }
+
+        ret = 0;
+out:
+        return ret;
+}
+
+int
+glusterd_snapshot_get_info_by_volume (dict_t *dict, char *volname,
+                                      char *err_str, size_t len)
+{
+        int                  ret           = -1;
+        int                  snapcount     = 0;
+        int                  snap_limit    = 0;
+        char                *value         = NULL;
+        char                 key[PATH_MAX] = "";
+        glusterd_volinfo_t  *volinfo       = NULL;
+        glusterd_volinfo_t  *snap_vol      = NULL;
+        glusterd_volinfo_t  *tmp_vol       = NULL;
+        glusterd_conf_t     *conf          = NULL;
+        xlator_t            *this          = NULL;
+
+        this = THIS;
+        conf = this->private;
+        GF_ASSERT (conf);
+
+        GF_ASSERT (dict);
+        GF_ASSERT (volname);
+
+        ret = glusterd_volinfo_find (volname, &volinfo);
+        if (ret) {
+                snprintf (err_str, len, "Volume (%s) does not exist", volname);
+                gf_log (this->name, GF_LOG_ERROR, "%s", err_str);
+                goto out;
+        }
+
+        /* Snaps available */
+        if (conf->snap_max_hard_limit < volinfo->snap_max_hard_limit) {
+                snap_limit = conf->snap_max_hard_limit;
+                gf_log(this->name, GF_LOG_DEBUG, "system snap-max-hard-limit is"
+                       " lesser than volume snap-max-hard-limit, "
+                       "snap-max-hard-limit value is set to %d", snap_limit);
+        } else {
+                snap_limit = volinfo->snap_max_hard_limit;
+                gf_log(this->name, GF_LOG_DEBUG, "volume snap-max-hard-limit is"
+                       " lesser than system snap-max-hard-limit, "
+                       "snap-max-hard-limit value is set to %d", snap_limit);
+        }
+
+        if (snap_limit > volinfo->snap_count)
+                ret = dict_set_int32 (dict, "snaps-available",
+                        snap_limit - volinfo->snap_count);
+        else
+                ret = dict_set_int32 (dict, "snaps-available", 0);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Failed to set available snaps");
+                goto out;
+        }
+
+        /* Origin volume name */
+        value = gf_strdup (volinfo->volname);
+        if (!value)
+                goto out;
+
+        ret = dict_set_dynstr (dict, "origin-volname", value);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to set parent "
+                        "volume name in dictionary: %s", key);
+                goto out;
+        }
+        value = NULL;
+
+        list_for_each_entry_safe (snap_vol, tmp_vol, &volinfo->snap_volumes,
+                                  snapvol_list) {
+                snapcount++;
+                snprintf (key, sizeof (key), "snap%d", snapcount);
+                ret = glusterd_snapshot_get_snap_detail (dict,
+                                                         snap_vol->snapshot,
+                                                         key, snap_vol);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR, "Failed to get "
+                                "snapdetail for snap %s",
+                                snap_vol->snapshot->snapname);
+                        goto out;
+                }
+        }
+        ret = dict_set_int32 (dict, "snap-count", snapcount);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to set snapcount");
+                goto out;
+        }
+
+        ret = 0;
+out:
+        if (value)
+                GF_FREE (value);
+
+        return ret;
+}
+
+/* This function will be called from RPC handler routine.
+ * This function is responsible for getting the requested
+ * snapshot info into the dictionary.
+ *
+ * @param req   RPC request object. Required for sending a response back.
+ * @param op    glusterd operation. Required for sending a response back.
+ * @param dict  pointer to dictionary which will contain both
+ *              request and response key-pair values.
+ * @return -1 on error and 0 on success
+ */
+int
+glusterd_handle_snapshot_info (rpcsvc_request_t *req, glusterd_op_t op,
+                               dict_t *dict, char *err_str, size_t len)
+{
+        int              ret             =       -1;
+        int8_t          snap_driven      =        1;
+        char            *volname         =      NULL;
+        char            *snapname        =      NULL;
+        glusterd_snap_t *snap            =      NULL;
+        xlator_t        *this            =      NULL;
+        int32_t         cmd              =      GF_SNAP_INFO_TYPE_ALL;
+
+        this = THIS;
+        GF_ASSERT (this);
+
+        GF_VALIDATE_OR_GOTO (this->name, req, out);
+        GF_VALIDATE_OR_GOTO (this->name, dict, out);
+
+
+        ret = dict_get_int32 (dict, "cmd", &cmd);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to get type "
+                        "of snapshot info");
+                goto out;
+        }
+
+        switch (cmd) {
+                case GF_SNAP_INFO_TYPE_ALL:
+                {
+                        ret = glusterd_snapshot_get_all_snap_info (dict);
+                        if (ret) {
+                                gf_log (this->name, GF_LOG_ERROR,
+                                        "Failed to get info of all snaps");
+                                goto out;
+                        }
+                        break;
+                }
+
+                case GF_SNAP_INFO_TYPE_SNAP:
+                {
+                        ret = dict_get_str (dict, "snapname", &snapname);
+                        if (ret) {
+                                gf_log (this->name, GF_LOG_ERROR,
+                                        "Failed to get snap name");
+                                goto out;
+                        }
+
+                        ret = dict_set_int32 (dict, "snap-count", 1);
+                        if (ret) {
+                                gf_log (this->name, GF_LOG_ERROR,
+                                        "Failed to set snapcount");
+                                goto out;
+                        }
+
+                        snap = glusterd_find_snap_by_name (snapname);
+                        if (!snap) {
+                                snprintf (err_str, len,
+                                         "Snap (%s) does not exist", snapname);
+                                gf_log (this->name, GF_LOG_ERROR,
+                                        "%s", err_str);
+                                ret = -1;
+                                goto out;
+                        }
+                        ret = glusterd_snapshot_get_snap_detail (dict, snap,
+                                                                "snap1", NULL);
+                        if (ret) {
+                                gf_log (this->name, GF_LOG_ERROR,
+                                        "Failed to get snap detail of snap "
+                                        "%s", snap->snapname);
+                                goto out;
+                        }
+                        break;
+                }
+
+                case GF_SNAP_INFO_TYPE_VOL:
+                {
+                        ret = dict_get_str (dict, "volname", &volname);
+                        if (ret) {
+                                gf_log (this->name, GF_LOG_ERROR,
+                                        "Failed to get volname");
+                                goto out;
+                        }
+                        ret = glusterd_snapshot_get_info_by_volume (dict,
+                                                        volname, err_str, len);
+                        if (ret) {
+                                gf_log (this->name, GF_LOG_ERROR,
+                                        "Failed to get volume info of volume "
+                                        "%s", volname);
+                                goto out;
+                        }
+                        snap_driven = 0;
+                        break;
+                }
+        }
+
+        ret = dict_set_int8 (dict, "snap-driven", snap_driven);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to set snap-driven");
+                goto out;
+        }
+
+        /* If everything is successful then send the response back to cli.
+         * In case of failure the caller of this function will take care
+           of the response */
+        ret = glusterd_op_send_cli_response (op, 0, 0, req, dict, err_str);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to send cli "
+                                "response");
+                goto out;
+        }
+
+        ret = 0;
+
+out:
+        return ret;
+}
+
+/* This function sets all the snapshot names in the dictionary */
+int
+glusterd_snapshot_get_all_snapnames (dict_t *dict)
+{
+        int              ret             = -1;
+        int              snapcount       = 0;
+        char            *snapname        = NULL;
+        char             key[PATH_MAX]   = {0,};
+        glusterd_snap_t *snap            = NULL;
+        glusterd_snap_t *tmp_snap        = NULL;
+        glusterd_conf_t *priv            = NULL;
+        xlator_t        *this            = NULL;
+
+        this = THIS;
+        priv = this->private;
+        GF_ASSERT (priv);
+        GF_ASSERT (dict);
+
+        list_for_each_entry_safe (snap, tmp_snap, &priv->snapshots, snap_list) {
+                snapcount++;
+                snapname = gf_strdup (snap->snapname);
+                if (!snapname) {
+                        gf_log (this->name, GF_LOG_ERROR, "strdup failed");
+                        ret = -1;
+                        goto out;
+                }
+                snprintf (key, sizeof (key), "snapname%d", snapcount);
+                ret = dict_set_dynstr (dict, key, snapname);
+                if (ret) {
+                        GF_FREE (snapname);
+                        gf_log (this->name, GF_LOG_ERROR, "Failed to set %s",
+                                key);
+                        goto out;
+                }
+        }
+
+        ret = dict_set_int32 (dict, "snap-count", snapcount);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to set snapcount");
+                goto out;
+        }
+
+        ret = 0;
+out:
+
+        return ret;
+}
+
+/* This function sets all the snapshot names
+   under a given volume in the dictionary */
+int
+glusterd_snapshot_get_vol_snapnames (dict_t *dict, glusterd_volinfo_t *volinfo)
+{
+        int                 ret             = -1;
+        int                 snapcount       = 0;
+        char               *snapname        = NULL;
+        char                key[PATH_MAX]   = {0,};
+        glusterd_volinfo_t *snap_vol        = NULL;
+        glusterd_volinfo_t *tmp_vol         = NULL;
+        xlator_t           *this            = NULL;
+
+        this = THIS;
+        GF_ASSERT (dict);
+        GF_ASSERT (volinfo);
+
+        list_for_each_entry_safe (snap_vol, tmp_vol,
+                                  &volinfo->snap_volumes, snapvol_list) {
+                snapcount++;
+                snapname = gf_strdup (snap_vol->snapshot->snapname);
+                if (!snapname) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "strdup failed");
+                        ret = -1;
+                        goto out;
+                }
+                snprintf (key, sizeof (key), "snapname%d", snapcount);
+                ret = dict_set_dynstr (dict, key, snapname);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR, "Failed to "
+                                "set %s", key);
+                        GF_FREE (snapname);
+                        goto out;
+                }
+        }
+
+        ret = dict_set_int32 (dict, "snap-count", snapcount);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to set snapcount");
+                goto out;
+        }
+
+        ret = 0;
+out:
+
+        return ret;
+}
+
+int
+glusterd_handle_snapshot_list (rpcsvc_request_t *req, glusterd_op_t op,
+                               dict_t *dict, char *err_str, size_t len)
+{
+        int                 ret             = -1;
+        char               *volname         = NULL;
+        glusterd_volinfo_t *volinfo         = NULL;
+        xlator_t           *this            = NULL;
+
+        this = THIS;
+
+        GF_VALIDATE_OR_GOTO (this->name, req, out);
+        GF_VALIDATE_OR_GOTO (this->name, dict, out);
+
+        /* Ignore error for getting volname as it is optional */
+        ret = dict_get_str (dict, "volname", &volname);
+
+        if (NULL == volname) {
+                ret = glusterd_snapshot_get_all_snapnames (dict);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Failed to get snapshot list");
+                        goto out;
+                }
+        } else {
+                ret = glusterd_volinfo_find (volname, &volinfo);
+                if (ret) {
+                        snprintf (err_str, len,
+                                 "Volume (%s) does not exist", volname);
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "%s", err_str);
+                        goto out;
+                }
+
+                ret = glusterd_snapshot_get_vol_snapnames (dict, volinfo);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Failed to get snapshot list for volume %s",
+                                volname);
+                        goto out;
+                }
+        }
+
+        /* If everything is successful then send the response back to cli.
+        In case of failure the caller of this function will take of response.*/
+        ret = glusterd_op_send_cli_response (op, 0, 0, req, dict, err_str);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to send cli "
+                                "response");
+                goto out;
+        }
+
+        ret = 0;
+
+out:
+        return ret;
+}
+
+/* This is a snapshot create handler function. This function will be
+ * executed in the originator node. This function is responsible for
+ * calling mgmt_v3 framework to do the actual snap creation on all the bricks
+ *
+ * @param req           RPC request object
+ * @param op            gluster operation
+ * @param dict          dictionary containing snapshot restore request
+ * @param err_str       In case of an err this string should be populated
+ * @param len           length of err_str buffer
+ *
+ * @return              Negative value on Failure and 0 in success
+ */
+int
+glusterd_handle_snapshot_create (rpcsvc_request_t *req, glusterd_op_t op,
+                               dict_t *dict, char *err_str, size_t len)
+{
+        int           ret                     = -1;
+        char         *volname                 = NULL;
+        char         *snapname                = NULL;
+        int64_t       volcount                = 0;
+        xlator_t     *this                    = NULL;
+        char          key[PATH_MAX]           = "";
+        char         *username                = NULL;
+        char         *password                = NULL;
+        uuid_t       *uuid_ptr                = NULL;
+        uuid_t        tmp_uuid                = {0};
+        int           i                       = 0;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (req);
+        GF_ASSERT (dict);
+        GF_ASSERT (err_str);
+
+        ret = dict_get_int64 (dict, "volcount", &volcount);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "failed to "
+                        "get the volume count");
+                goto out;
+        }
+        if (volcount <= 0) {
+                gf_log (this->name, GF_LOG_ERROR, "Invalid volume count %ld "
+                        "supplied", volcount);
+                ret = -1;
+                goto out;
+        }
+
+        ret = dict_get_str (dict, "snapname", &snapname);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "failed to get the snapname");
+                goto out;
+        }
+
+        if (strlen(snapname) >= GLUSTERD_MAX_SNAP_NAME) {
+                snprintf (err_str, len, "snapname cannot exceed 255 "
+                          "characters");
+                gf_log (this->name, GF_LOG_ERROR, "%s", err_str);
+                ret = -1;
+                goto out;
+        }
+
+        uuid_ptr = GF_CALLOC (1, sizeof(uuid_t), gf_common_mt_uuid_t);
+        if (!uuid_ptr) {
+                gf_log (this->name, GF_LOG_ERROR, "Out Of Memory");
+                ret = -1;
+                goto out;
+        }
+
+        uuid_generate (*uuid_ptr);
+        ret = dict_set_bin (dict, "snap-id", uuid_ptr, sizeof(uuid_t));
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Unable to set snap-id");
+                GF_FREE (uuid_ptr);
+                goto out;
+        }
+        uuid_ptr = NULL;
+
+        ret = dict_set_int64 (dict, "snap-time", (int64_t)time(NULL));
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Unable to set snap-time");
+                goto out;
+        }
+
+        for (i = 1; i <= volcount; i++) {
+                snprintf (key, sizeof (key), "volname%d", i);
+                ret = dict_get_str (dict, key, &volname);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Failed to get volume name");
+                        goto out;
+                }
+
+                /* generate internal username and password  for the snap*/
+                uuid_generate (tmp_uuid);
+                username = gf_strdup (uuid_utoa (tmp_uuid));
+                snprintf (key, sizeof(key), "volume%d_username", i);
+                ret = dict_set_dynstr (dict, key, username);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR, "Failed to set snap "
+                                "username for volume %s", volname);
+                        GF_FREE (username);
+                        goto out;
+                }
+
+                uuid_generate (tmp_uuid);
+                password = gf_strdup (uuid_utoa (tmp_uuid));
+                snprintf (key, sizeof(key), "volume%d_password", i);
+                ret = dict_set_dynstr (dict, key, password);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR, "Failed to set snap "
+                                "password for volume %s", volname);
+                        GF_FREE (password);
+                        goto out;
+                }
+
+                uuid_ptr = GF_CALLOC (1, sizeof(uuid_t), gf_common_mt_uuid_t);
+                if (!uuid_ptr) {
+                        gf_log (this->name, GF_LOG_ERROR, "Out Of Memory");
+                        ret = -1;
+                        goto out;
+                }
+
+                snprintf (key, sizeof(key) - 1, "vol%d_volid", i);
+                uuid_generate (*uuid_ptr);
+                ret = dict_set_bin (dict, key, uuid_ptr, sizeof(uuid_t));
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Unable to set snap_volid");
+                        GF_FREE (uuid_ptr);
+                        goto out;
+                }
+        }
+
+        ret = glusterd_mgmt_v3_initiate_snap_phases (req, op, dict);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to initiate snap "
+                                "phases");
+        }
+
+out:
+        return ret;
+}
+
+/* This is a snapshot status handler function. This function will be
+ * executed in a originator node. This function is responsible for
+ * calling mgmt v3 framework to get the actual snapshot status from
+ * all the bricks
+ *
+ * @param req           RPC request object
+ * @param op            gluster operation
+ * @param dict          dictionary containing snapshot status request
+ * @param err_str       In case of an err this string should be populated
+ * @param len           length of err_str buffer
+ *
+ * return :  0  in case of success.
+ *          -1  in case of failure.
+ *
+ */
+int
+glusterd_handle_snapshot_status (rpcsvc_request_t *req, glusterd_op_t op,
+                                 dict_t *dict, char *err_str, size_t len)
+{
+        int                     ret             =       -1;
+        char                    *volname        =       NULL;
+        char                    *snapname       =       NULL;
+        char                    *buf            =       NULL;
+        glusterd_conf_t         *conf           =       NULL;
+        xlator_t                *this           =       NULL;
+        int32_t                 cmd             =       -1;
+        int                     i               =       0;
+        dict_t                  *voldict        =       NULL;
+        char                    key[PATH_MAX]   =       "";
+        glusterd_volinfo_t     *volinfo         =       NULL;
+        glusterd_snap_t         *snap           =       NULL;
+        glusterd_volinfo_t      *snap_volinfo   =       NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        conf = this->private;
+
+        GF_ASSERT (conf);
+        GF_ASSERT (req);
+        GF_ASSERT (dict);
+        GF_ASSERT (err_str);
+
+        ret = dict_get_int32 (dict, "cmd", &cmd);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Could not get status type");
+                goto out;
+        }
+        switch (cmd) {
+                case GF_SNAP_STATUS_TYPE_ALL:
+                {
+                        /* IF we give "gluster snapshot status"
+                         * then lock is held on all snaps.
+                         * This is the place where necessary information
+                         * (snapname and snapcount)is populated in dictionary
+                         * for locking.
+                         */
+                        ++i;
+                        list_for_each_entry (snap, &conf->snapshots, snap_list)
+                        {
+                                snprintf (key, sizeof (key), "snapname%d", i);
+                                buf = gf_strdup (snap->snapname);
+                                if (!buf) {
+                                        ret = -1;
+                                        goto out;
+                                }
+                                ret = dict_set_dynstr (dict, key, buf);
+                                if (ret) {
+                                        gf_log (this->name, GF_LOG_ERROR,
+                                                "Could not save snapname (%s) "
+                                                "in the dictionary",
+                                                snap->snapname);
+                                        GF_FREE (buf);
+                                        goto out;
+                                }
+
+                                buf = NULL;
+                                i++;
+                        }
+
+                        ret = dict_set_int32 (dict, "snapcount", i - 1);
+                        if (ret) {
+                                gf_log (this->name, GF_LOG_ERROR, "Could not "
+                                        "save snapcount in the dictionary");
+                                goto out;
+                        }
+                        break;
+                }
+
+                case GF_SNAP_STATUS_TYPE_SNAP:
+                {
+                        /* IF we give "gluster snapshot status <snapname>"
+                         * then lock is held on single snap.
+                         * This is the place where necessary information
+                         * (snapname)is populated in dictionary
+                         * for locking.
+                         */
+                        ret = dict_get_str (dict, "snapname", &snapname);
+                        if (ret) {
+                                gf_log (this->name, GF_LOG_ERROR,
+                                        "Failed to fetch snap name");
+                                goto out;
+                        }
+
+                        snap = glusterd_find_snap_by_name (snapname);
+                        if (!snap) {
+                                snprintf (err_str, len, "Snap (%s)"
+                                          "does not exist", snapname);
+                                gf_log(this->name, GF_LOG_ERROR,
+                                        "%s", err_str);
+                                ret = -1;
+                                goto out;
+                        }
+                        break;
+                }
+                case GF_SNAP_STATUS_TYPE_VOL:
+                        ret = dict_get_str (dict, "volname", &volname);
+                        if (ret) {
+                                gf_log (this->name, GF_LOG_ERROR,
+                                        "Failed to fetch volname");
+                                goto out;
+                        }
+
+                        ret = glusterd_volinfo_find (volname, &volinfo);
+                        if (ret) {
+                                snprintf (err_str, len, "Volume (%s) "
+                                          "does not exist", volname);
+                                gf_log (this->name, GF_LOG_ERROR,
+                                        "%s", err_str);
+                                goto out;
+                        }
+
+                        i = 1;
+                        list_for_each_entry (snap_volinfo,
+                                        &volinfo->snap_volumes, snapvol_list) {
+                                snprintf (key, sizeof (key), "snapname%d", i);
+
+                                buf = gf_strdup
+                                             (snap_volinfo->snapshot->snapname);
+                                if (!buf) {
+                                        ret = -1;
+                                        goto out;
+                                }
+
+                                ret = dict_set_dynstr (dict, key, buf);
+                                if (ret) {
+                                        gf_log (this->name, GF_LOG_ERROR,
+                                                "Could not save snapname");
+                                        GF_FREE (buf);
+                                        goto out;
+                                }
+
+                                buf = NULL;
+                                i++;
+                        }
+
+                        ret = dict_set_int32 (dict, "snapcount", i-1);
+                        if (ret) {
+                                gf_log (this->name, GF_LOG_ERROR,
+                                        "Could not save snapcount");
+                                goto out;
+                        }
+                        break;
+                default:
+                {
+                        gf_log (this->name, GF_LOG_ERROR, "Unknown type");
+                        ret = -1;
+                        goto out;
+                }
+        }
+
+        /* Volume lock is not necessary for snapshot status, hence
+         * turning it off
+         */
+        ret = dict_set_int8 (dict, "hold_vol_locks", 0);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Setting volume lock "
+                        "flag failed");
+                goto out;
+        }
+
+        ret = glusterd_mgmt_v3_initiate_snap_phases (req, op, dict);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to initiate "
+                        "snap phases");
+                goto out;
+        }
+
+        ret = 0;
+
+out:
+        if (voldict) {
+                dict_unref (voldict);
+        }
+        return ret;
+}
+
+
+/* This is a snapshot restore handler function. This function will be
+ * executed in the originator node. This function is responsible for
+ * calling mgmt_v3 framework to do the actual restore on all the bricks
+ *
+ * @param req           RPC request object
+ * @param op            gluster operation
+ * @param dict          dictionary containing snapshot restore request
+ * @param err_str       In case of an err this string should be populated
+ * @param len           length of err_str buffer
+ *
+ * @return              Negative value on Failure and 0 in success
+ */
+int
+glusterd_handle_snapshot_restore (rpcsvc_request_t *req, glusterd_op_t op,
+                               dict_t *dict, char *err_str, size_t len)
+{
+        int                     ret             = -1;
+        char                    *snapname       = NULL;
+        char                    *buf            = NULL;
+        glusterd_conf_t         *conf           = NULL;
+        xlator_t                *this           = NULL;
+        glusterd_snap_t         *snap           = NULL;
+        glusterd_volinfo_t      *snap_volinfo   = NULL;
+        int32_t                 i               =    0;
+        char                    key[PATH_MAX]   =    "";
+
+        this = THIS;
+        GF_ASSERT (this);
+        conf = this->private;
+
+        GF_ASSERT (conf);
+        GF_ASSERT (req);
+        GF_ASSERT (dict);
+        GF_ASSERT (err_str);
+
+        ret = dict_get_str (dict, "snapname", &snapname);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to "
+                        "get snapname");
+                goto out;
+        }
+
+        snap = glusterd_find_snap_by_name (snapname);
+        if (!snap) {
+                snprintf (err_str, len, "Snap (%s) does not exist", snapname);
+                gf_log (this->name, GF_LOG_ERROR, "%s", err_str);
+                ret = -1;
+                goto out;
+        }
+
+        list_for_each_entry (snap_volinfo, &snap->volumes, vol_list) {
+                i++;
+                snprintf (key, sizeof (key), "volname%d", i);
+                buf = gf_strdup (snap_volinfo->parent_volname);
+                if (!buf) {
+                        ret = -1;
+                        goto out;
+                }
+                ret = dict_set_dynstr (dict, key, buf);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR, "Could not set "
+                                "parent volume name %s in the dict",
+                                snap_volinfo->parent_volname);
+                        GF_FREE (buf);
+                        goto out;
+                }
+                buf = NULL;
+        }
+
+        ret = dict_set_int32 (dict, "volcount", i);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Could not save volume count");
+                goto out;
+        }
+
+        ret = glusterd_mgmt_v3_initiate_snap_phases (req, op, dict);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to initiate snap "
+                                "phases");
+                goto out;
+        }
+
+        ret = 0;
+
+out:
+        return ret;
+}
+
+glusterd_snap_t*
+glusterd_create_snap_object (dict_t *dict, dict_t *rsp_dict)
+{
+        char              *snapname    = NULL;
+        uuid_t            *snap_id     = NULL;
+        char              *description = NULL;
+        glusterd_snap_t   *snap        = NULL;
+        xlator_t          *this        = NULL;
+        glusterd_conf_t   *priv        = NULL;
+        int                ret         = -1;
+        int64_t            time_stamp  = 0;
+
+        this = THIS;
+        priv = this->private;
+
+        GF_ASSERT (dict);
+        GF_ASSERT (rsp_dict);
+
+        /* Fetch snapname, description, id and time from dict */
+        ret = dict_get_str (dict, "snapname", &snapname);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Unable to fetch snapname");
+                goto out;
+        }
+
+        /* Ignore ret value for description*/
+        ret = dict_get_str (dict, "description", &description);
+
+        ret = dict_get_bin (dict, "snap-id", (void **)&snap_id);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Unable to fetch snap_id");
+                goto out;
+        }
+
+        ret = dict_get_int64 (dict, "snap-time", &time_stamp);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Unable to fetch snap-time");
+                goto out;
+        }
+        if (time_stamp <= 0) {
+                ret = -1;
+                gf_log (this->name, GF_LOG_ERROR, "Invalid time-stamp: %ld",
+                        time_stamp);
+                goto out;
+        }
+
+        list_for_each_entry (snap, &priv->snapshots, snap_list) {
+                if (!strcmp (snap->snapname, snapname) ||
+                    !uuid_compare (snap->snap_id, *snap_id)) {
+                        gf_log (THIS->name, GF_LOG_ERROR,
+                                "Found duplicate snap %s (%s)",
+                                snap->snapname, uuid_utoa (snap->snap_id));
+                        ret = -1;
+                        break;
+                }
+        }
+        if (ret) {
+                snap = NULL;
+                goto out;
+        }
+
+        snap = glusterd_new_snap_object ();
+        if (!snap) {
+                gf_log (this->name, GF_LOG_ERROR, "Could not create "
+                        "the snap object for snap %s", snapname);
+                goto out;
+        }
+
+        strcpy (snap->snapname, snapname);
+        uuid_copy (snap->snap_id, *snap_id);
+        snap->time_stamp = (time_t)time_stamp;
+        /* Set the status as GD_SNAP_STATUS_INIT and once the backend snapshot
+           is taken and snap is really ready to use, set the status to
+           GD_SNAP_STATUS_IN_USE. This helps in identifying the incomplete
+           snapshots and cleaning them up.
+        */
+        snap->snap_status = GD_SNAP_STATUS_INIT;
+        if (description) {
+                snap->description = gf_strdup (description);
+                if (snap->description == NULL) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Saving the Snap Description Failed");
+                        ret = -1;
+                        goto out;
+                }
+        }
+
+        ret = glusterd_store_snap (snap);
+        if (ret) {
+                gf_log (this->name, GF_LOG_WARNING, "Could not store snap"
+                        "object %s", snap->snapname);
+                goto out;
+        }
+
+        list_add_order (&snap->snap_list, &priv->snapshots,
+                        glusterd_compare_snap_time);
+
+        gf_log (this->name, GF_LOG_TRACE, "Snap %s added to the list",
+                snap->snapname);
+
+        ret = 0;
+
+out:
+        if (ret) {
+                if (snap)
+                        glusterd_snap_remove (rsp_dict, snap,
+                                              _gf_true, _gf_true);
+                snap = NULL;
+        }
+
+        return snap;
+}
+
+/* This function is called to get the device path of the snap lvm. Usually
+   if /dev/mapper/<group-name>-<lvm-name> is the device for the lvm,
+   then the snap device will be /dev/<group-name>/<snapname>.
+   This function takes care of building the path for the snap device.
+*/
+char *
+glusterd_build_snap_device_path (char *device, char *snapname)
+{
+        char        snap[PATH_MAX]      = "";
+        char        msg[1024]           = "";
+        char        volgroup[PATH_MAX]  = "";
+        char       *snap_device         = NULL;
+        xlator_t   *this                = NULL;
+        runner_t    runner              = {0,};
+        char       *ptr                 = NULL;
+        int         ret                 = -1;
+
+        this = THIS;
+        GF_ASSERT (this);
+        if (!device) {
+                gf_log (this->name, GF_LOG_ERROR, "device is NULL");
+                goto out;
+        }
+        if (!snapname) {
+                gf_log (this->name, GF_LOG_ERROR, "snapname is NULL");
+                goto out;
+        }
+
+        runinit (&runner);
+        runner_add_args (&runner, "/sbin/lvs", "--noheadings", "-o", "vg_name",
+                         device, NULL);
+        runner_redir (&runner, STDOUT_FILENO, RUN_PIPE);
+        snprintf (msg, sizeof (msg), "Get volume group for device %s", device);
+        runner_log (&runner, this->name, GF_LOG_DEBUG, msg);
+        ret = runner_start (&runner);
+        if (ret == -1) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to get volume group "
+                        "for device %s", device);
+                runner_end (&runner);
+                goto out;
+        }
+        ptr = fgets(volgroup, sizeof(volgroup),
+                    runner_chio (&runner, STDOUT_FILENO));
+        if (!ptr || !strlen(volgroup)) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to get volume group "
+                        "for snap %s", snapname);
+                runner_end (&runner);
+                ret = -1;
+                goto out;
+        }
+        runner_end (&runner);
+
+        snprintf (snap, sizeof(snap), "/dev/%s/%s", gf_trim(volgroup),
+                  snapname);
+        snap_device = gf_strdup (snap);
+        if (!snap_device) {
+                gf_log (this->name, GF_LOG_WARNING, "Cannot copy the "
+                        "snapshot device name for snapname: %s)", snapname);
+        }
+
+out:
+        return snap_device;
+}
+
+/* This function actually calls the command (or the API) for taking the
+   snapshot of the backend brick filesystem. If this is successful,
+   then call the glusterd_snap_create function to create the snap object
+   for glusterd
+*/
+char *
+glusterd_take_lvm_snapshot (glusterd_volinfo_t *snap_vol,
+                            glusterd_brickinfo_t *brickinfo)
+{
+        char             msg[NAME_MAX]    = "";
+        char             buf[PATH_MAX]    = "";
+        char            *snap_device      = NULL;
+        char            *ptr              = NULL;
+        char            *device           = NULL;
+        int              ret              = -1;
+        gf_boolean_t     match            = _gf_false;
+        runner_t         runner           = {0,};
+        xlator_t        *this             = NULL;
+
+        this = THIS;
+
+        if (!brickinfo) {
+                gf_log (this->name, GF_LOG_ERROR, "brickinfo NULL");
+                goto out;
+        }
+
+        device = glusterd_get_brick_mount_details (brickinfo);
+        if (!device) {
+                gf_log (this->name, GF_LOG_ERROR, "getting device name for "
+                        "the brick %s:%s failed", brickinfo->hostname,
+                        brickinfo->path);
+                goto out;
+        }
+
+        /* Figuring out if setactivationskip flag is supported or not */
+        runinit (&runner);
+        snprintf (msg, sizeof (msg), "running lvcreate help");
+        runner_add_args (&runner, "/sbin/lvcreate", "--help", NULL);
+        runner_log (&runner, "", GF_LOG_DEBUG, msg);
+        runner_redir (&runner, STDOUT_FILENO, RUN_PIPE);
+        ret = runner_start (&runner);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Failed to run lvcreate help");
+                runner_end (&runner);
+                goto out;
+        }
+
+        /* Looking for setactivationskip in lvcreate --help */
+        do {
+                ptr = fgets(buf, sizeof(buf),
+                            runner_chio (&runner, STDOUT_FILENO));
+                if (ptr) {
+                        if (strstr(buf, "setactivationskip")) {
+                                match = _gf_true;
+                                break;
+                        }
+                }
+        } while (ptr != NULL);
+        runner_end (&runner);
+
+        /* Takng the actual snapshot */
+        runinit (&runner);
+        snprintf (msg, sizeof (msg), "taking snapshot of the brick %s:%s",
+                  brickinfo->hostname, brickinfo->path);
+        if (match == _gf_true)
+                runner_add_args (&runner, "/sbin/lvcreate", "-s", device,
+                                 "--setactivationskip", "n", "--name",
+                                 snap_vol->volname, NULL);
+        else
+                runner_add_args (&runner, "/sbin/lvcreate", "-s", device,
+                                 "--name", snap_vol->volname, NULL);
+        runner_log (&runner, "", GF_LOG_DEBUG, msg);
+        ret = runner_start (&runner);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "taking snapshot of the "
+                        "brick (%s:%s) of device %s failed",
+                        brickinfo->hostname, brickinfo->path, device);
+                runner_end (&runner);
+                goto out;
+        }
+        runner_end (&runner);
+
+        snap_device = glusterd_build_snap_device_path (device,
+                                                       snap_vol->volname);
+        if (!snap_device) {
+                gf_log (this->name, GF_LOG_WARNING, "Cannot copy the snapshot "
+                        "device name for snap %s (volume id: %s)",
+                        snap_vol->snapshot->snapname, snap_vol->volname);
+                ret = -1;
+                goto out;
+        }
+
+out:
+        return snap_device;
+}
+
+int32_t
+glusterd_snap_brick_create (char *device, glusterd_volinfo_t *snap_volinfo,
+                            glusterd_brickinfo_t *original_brickinfo,
+                            int32_t brick_count, char *snap_brick_dir)
+{
+        int32_t          ret                             = -1;
+        xlator_t        *this                            = NULL;
+        glusterd_conf_t *priv                            = NULL;
+        char             snap_brick_mount_path[PATH_MAX] = "";
+        char             snap_brick_path[PATH_MAX]       = "";
+        char             msg[1024]                       = "";
+        struct stat      statbuf                         = {0, };
+        runner_t         runner                          = {0, };
+
+        this = THIS;
+        priv = this->private;
+
+        GF_ASSERT (device);
+        GF_ASSERT (snap_volinfo);
+        GF_ASSERT (original_brickinfo);
+        GF_ASSERT (snap_brick_dir);
+
+        snprintf (snap_brick_mount_path, sizeof (snap_brick_mount_path),
+                  "%s/%s/brick%d",  snap_mount_folder, snap_volinfo->volname,
+                  brick_count+1);
+
+        snprintf (snap_brick_path, sizeof (snap_brick_path), "%s%s",
+                  snap_brick_mount_path, snap_brick_dir);
+
+        ret = mkdir_p (snap_brick_mount_path, 0777, _gf_true);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "creating the brick directory"
+                        " %s for the snapshot %s(device: %s) failed",
+                        snap_brick_mount_path, snap_volinfo->volname, device);
+                goto out;
+        }
+        /* mount the snap logical device on the directory inside
+           /run/gluster/snaps/<snapname>/@snap_brick_mount_path
+           Way to mount the snap brick via mount api is this.
+           ret = mount (device, snap_brick_mount_path, entry->mnt_type,
+                        MS_MGC_VAL, "nouuid");
+           But for now, mounting using runner apis.
+        */
+        runinit (&runner);
+        snprintf (msg, sizeof (msg), "mounting snapshot of the brick %s:%s",
+                  original_brickinfo->hostname, original_brickinfo->path);
+        runner_add_args (&runner, "mount", "-o", "nouuid", device,
+                         snap_brick_mount_path, NULL);
+        runner_log (&runner, "", GF_LOG_DEBUG, msg);
+
+        /* let glusterd get blocked till snapshot is over */
+        synclock_unlock (&priv->big_lock);
+        ret = runner_run (&runner);
+        synclock_lock (&priv->big_lock);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "mounting the snapshot "
+                        "logical device %s failed (error: %s)", device,
+                        strerror (errno));
+                goto out;
+        } else
+                gf_log (this->name, GF_LOG_DEBUG, "mounting the snapshot "
+                        "logical device %s successful", device);
+
+        ret = stat (snap_brick_path, &statbuf);
+        if (ret) {
+                gf_log (this->name, GF_LOG_WARNING, "stat of the brick %s"
+                        "(brick mount: %s) failed (%s)", snap_brick_path,
+                        snap_brick_mount_path, strerror (errno));
+                goto out;
+        }
+        ret = sys_lsetxattr (snap_brick_path,
+                             GF_XATTR_VOL_ID_KEY,
+                             snap_volinfo->volume_id, 16,
+                             XATTR_REPLACE);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to set "
+                        "extended attribute %s on %s. Reason: "
+                        "%s, snap: %s", GF_XATTR_VOL_ID_KEY,
+                        snap_brick_path, strerror (errno),
+                        snap_volinfo->volname);
+                goto out;
+        }
+
+out:
+        if (ret) {
+                gf_log (this->name, GF_LOG_WARNING, "unmounting the snap brick"
+                        " mount %s", snap_brick_mount_path);
+                umount (snap_brick_mount_path);
+        }
+
+        gf_log (this->name, GF_LOG_TRACE, "Returning %d", ret);
+        return ret;
+}
+
+/* Added missed_snap_entry to rsp_dict */
+int32_t
+glusterd_add_missed_snaps_to_dict (dict_t *rsp_dict, char *snap_uuid,
+                                   glusterd_brickinfo_t *brickinfo,
+                                   int32_t brick_number, int32_t op)
+{
+        char                   *buf                             = NULL;
+        char                    missed_snap_entry[PATH_MAX]     = "";
+        char                    name_buf[PATH_MAX]              = "";
+        int32_t                 missed_snap_count               = -1;
+        int32_t                 ret                             = -1;
+        xlator_t               *this                            = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (rsp_dict);
+        GF_ASSERT (snap_uuid);
+        GF_ASSERT (brickinfo);
+
+        snprintf (missed_snap_entry, sizeof(missed_snap_entry),
+                  "%s:%s=%d:%s:%d:%d", uuid_utoa(brickinfo->uuid),
+                  snap_uuid, brick_number, brickinfo->path, op,
+                  GD_MISSED_SNAP_PENDING);
+
+        buf = gf_strdup (missed_snap_entry);
+        if (!buf) {
+                ret = -1;
+                goto out;
+        }
+
+        /* Fetch the missed_snap_count from the dict */
+        ret = dict_get_int32 (rsp_dict, "missed_snap_count",
+                              &missed_snap_count);
+        if (ret) {
+                /* Initialize the missed_snap_count for the first time */
+                missed_snap_count = 0;
+        }
+
+        /* Setting the missed_snap_entry in the rsp_dict */
+        snprintf (name_buf, sizeof(name_buf), "missed_snaps_%d",
+                  missed_snap_count);
+        ret = dict_set_dynstr (rsp_dict, name_buf, buf);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Failed to set missed_snap_entry (%s) "
+                        "in the rsp_dict.", buf);
+                GF_FREE (buf);
+                goto out;
+        }
+        missed_snap_count++;
+
+        /* Setting the new missed_snap_count in the dict */
+        ret = dict_set_int32 (rsp_dict, "missed_snap_count",
+                              missed_snap_count);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Failed to set missed_snap_count for %s "
+                        "in the rsp_dict.", missed_snap_entry);
+                goto out;
+        }
+
+out:
+        gf_log (this->name, GF_LOG_TRACE, "Returning %d", ret);
+        return ret;
+}
+
+static int32_t
+glusterd_add_bricks_to_snap_volume (dict_t *dict, dict_t *rsp_dict,
+                                    glusterd_volinfo_t  *snap_vol,
+                                    glusterd_brickinfo_t *original_brickinfo,
+                                    glusterd_brickinfo_t *snap_brickinfo,
+                                    char **snap_brick_dir, int64_t volcount,
+                                    int32_t brick_count)
+{
+        char                    key[PATH_MAX]                   = "";
+        char                    snap_brick_path[PATH_MAX]       = "";
+        char                   *snap_device                     = NULL;
+        gf_boolean_t            add_missed_snap                 = _gf_false;
+        int32_t                 ret                             = -1;
+        xlator_t               *this                            = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (dict);
+        GF_ASSERT (rsp_dict);
+        GF_ASSERT (snap_vol);
+        GF_ASSERT (original_brickinfo);
+        GF_ASSERT (snap_brickinfo);
+        GF_ASSERT (snap_brick_dir);
+
+        snprintf (key, sizeof(key) - 1, "vol%ld.brickdir%d", volcount,
+                  brick_count);
+        ret = dict_get_ptr (dict, key, (void **)snap_brick_dir);
+        if (ret) {
+                /* Using original brickinfo here because it will be a
+                 * pending snapshot and storing the original brickinfo
+                 * will help in mapping while recreating the missed snapshot
+                 */
+                gf_log (this->name, GF_LOG_WARNING, "Unable to fetch "
+                        "snap mount path (%s). Using original brickinfo", key);
+                snap_brickinfo->snap_status = -1;
+                strcpy (snap_brick_path, original_brickinfo->path);
+
+                /* In origiator node add snaps missed
+                 * from different nodes to the dict
+                 */
+                if (is_origin_glusterd (dict) == _gf_true)
+                        add_missed_snap = _gf_true;
+        } else {
+                /* Create brick-path in the format /var/run/gluster/snaps/ *
+                 * <snap-uuid>/<original-brick#>/snap-brick-dir *
+                 */
+                snprintf (snap_brick_path, sizeof(snap_brick_path),
+                          "%s/%s/brick%d%s", snap_mount_folder,
+                          snap_vol->volname, brick_count+1,
+                          *snap_brick_dir);
+        }
+
+        if ((snap_brickinfo->snap_status != -1) &&
+            (!uuid_compare (original_brickinfo->uuid, MY_UUID)) &&
+            (!glusterd_is_brick_started (original_brickinfo))) {
+                /* In case if the brick goes down after prevalidate. */
+                gf_log (this->name, GF_LOG_WARNING, "brick %s:%s is not"
+                        " started (snap: %s)",
+                        original_brickinfo->hostname,
+                        original_brickinfo->path,
+                        snap_vol->snapshot->snapname);
+
+                snap_brickinfo->snap_status = -1;
+                strcpy (snap_brick_path, original_brickinfo->path);
+                add_missed_snap = _gf_true;
+        }
+
+        if (add_missed_snap) {
+                ret = glusterd_add_missed_snaps_to_dict (rsp_dict,
+                                            snap_vol->volname,
+                                            original_brickinfo,
+                                            brick_count + 1,
+                                            GF_SNAP_OPTION_TYPE_CREATE);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR, "Failed to add missed"
+                                " snapshot info for %s:%s in the rsp_dict",
+                                original_brickinfo->hostname,
+                                original_brickinfo->path);
+                        goto out;
+                }
+        }
+
+        snprintf (key, sizeof(key), "vol%ld.brick_snapdevice%d",
+                  volcount, brick_count);
+        ret = dict_get_ptr (dict, key, (void **)&snap_device);
+        if (ret) {
+                /* If the device name is empty, so will be the brick path
+                 * Hence the missed snap has already been added above
+                 */
+                gf_log (this->name, GF_LOG_ERROR, "Unable to fetch "
+                        "snap device (%s). Leaving empty", key);
+        } else
+                strcpy (snap_brickinfo->device_path, snap_device);
+
+        ret = gf_canonicalize_path (snap_brick_path);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Failed to canonicalize path");
+                goto out;
+        }
+
+        strcpy (snap_brickinfo->hostname, original_brickinfo->hostname);
+        strcpy (snap_brickinfo->path, snap_brick_path);
+        uuid_copy (snap_brickinfo->uuid, original_brickinfo->uuid);
+        list_add_tail (&snap_brickinfo->brick_list, &snap_vol->bricks);
+
+out:
+        gf_log (this->name, GF_LOG_TRACE, "Returning %d", ret);
+        return ret;
+}
+
+static int32_t
+glusterd_take_brick_snapshot (glusterd_volinfo_t *origin_vol,
+                              glusterd_volinfo_t *snap_vol, dict_t *rsp_dict,
+                              glusterd_brickinfo_t *original_brickinfo,
+                              glusterd_brickinfo_t *snap_brickinfo,
+                              char *snap_brick_dir, int32_t brick_count)
+{
+        char                   *device                          = NULL;
+        int32_t                 ret                             = -1;
+        xlator_t               *this                            = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (origin_vol);
+        GF_ASSERT (snap_vol);
+        GF_ASSERT (rsp_dict);
+        GF_ASSERT (original_brickinfo);
+        GF_ASSERT (snap_brickinfo);
+        GF_ASSERT (snap_brick_dir);
+
+        device = glusterd_take_lvm_snapshot (snap_vol, original_brickinfo);
+        /* Fail the snapshot even though snapshot on one of
+           the bricks fails. At the end when we check whether
+           the snapshot volume meets quorum or not, then the
+           the snapshot can either be treated as success, or
+           in case of failure we can undo the changes and return
+           failure to cli.  */
+        if (!device) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Failed to take snapshot of %s:%s",
+                        original_brickinfo->hostname,
+                        original_brickinfo->path);
+                goto out;
+        }
+
+        /* create the complete brick here */
+        ret = glusterd_snap_brick_create (device, snap_vol,
+                                          original_brickinfo,
+                                          brick_count, snap_brick_dir);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "not able to"
+                        " create the brickinfo for the snap %s"
+                        ", volume %s", snap_vol->snapshot->snapname,
+                        origin_vol->volname);
+                goto out;
+        }
+
+out:
+        if (device)
+                GF_FREE (device);
+
+        gf_log (this->name, GF_LOG_TRACE, "Returning %d", ret);
+        return ret;
+}
+
+/* Look for disconnected peers, for missed snap creates or deletes */
+static int32_t
+glusterd_find_missed_snap (dict_t *rsp_dict, glusterd_volinfo_t *vol,
+                           char *snap_uuid, struct list_head *peers,
+                           int32_t op)
+{
+        int32_t                   brick_count          = -1;
+        int32_t                   ret                  = -1;
+        xlator_t                 *this                 = NULL;
+        glusterd_peerinfo_t      *peerinfo             = NULL;
+        glusterd_brickinfo_t     *brickinfo            = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (rsp_dict);
+        GF_ASSERT (peers);
+        GF_ASSERT (vol);
+        GF_ASSERT (snap_uuid);
+
+        brick_count = 0;
+        list_for_each_entry (brickinfo, &vol->bricks, brick_list) {
+                if (!uuid_compare (brickinfo->uuid, MY_UUID)) {
+                        /* If the brick belongs to the same node */
+                        brick_count++;
+                        continue;
+                }
+
+                list_for_each_entry (peerinfo, peers, uuid_list) {
+                        if (uuid_compare (peerinfo->uuid, brickinfo->uuid)) {
+                                /* If the brick doesnt belong to this peer */
+                                continue;
+                        }
+
+                        /* Found peer who owns the brick,    *
+                         * if peer is not connected or not   *
+                         * friend add it to missed snap list */
+                        if (!(peerinfo->connected) ||
+                           (peerinfo->state.state !=
+                             GD_FRIEND_STATE_BEFRIENDED)) {
+                                ret = glusterd_add_missed_snaps_to_dict
+                                                   (rsp_dict,
+                                                    snap_uuid,
+                                                    brickinfo,
+                                                    brick_count + 1,
+                                                    op);
+                                if (ret) {
+                                        gf_log (this->name, GF_LOG_ERROR,
+                                                "Failed to add missed snapshot "
+                                                "info for %s:%s in the "
+                                                "rsp_dict", brickinfo->hostname,
+                                                brickinfo->path);
+                                        goto out;
+                                }
+                        }
+                }
+                brick_count++;
+        }
+
+        ret = 0;
+out:
+        gf_log (this->name, GF_LOG_TRACE, "Returning %d", ret);
+        return ret;
+}
+
+glusterd_volinfo_t *
+glusterd_do_snap_vol (glusterd_volinfo_t *origin_vol, glusterd_snap_t *snap,
+                      dict_t *dict, dict_t *rsp_dict, int64_t volcount)
+{
+        char                    key[PATH_MAX]                   = "";
+        char                   *snap_brick_dir                  = NULL;
+        char                   *username                        = NULL;
+        char                   *password                        = NULL;
+        glusterd_brickinfo_t   *brickinfo                       = NULL;
+        glusterd_conf_t        *priv                            = NULL;
+        glusterd_volinfo_t     *snap_vol                        = NULL;
+        uuid_t                 *snap_volid                      = NULL;
+        int32_t                 ret                             = -1;
+        int32_t                 brick_count                     = 0;
+        glusterd_brickinfo_t   *snap_brickinfo                  = NULL;
+        xlator_t               *this                            = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        priv = this->private;
+        GF_ASSERT (priv);
+        GF_ASSERT (origin_vol);
+        GF_ASSERT (dict);
+        GF_ASSERT (rsp_dict);
+
+        /* fetch username, password and vol_id from dict*/
+        snprintf (key, sizeof(key), "volume%ld_username", volcount);
+        ret = dict_get_str (dict, key, &username);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to get %s for "
+                        "snap %s", key, snap->snapname);
+                goto out;
+        }
+
+        snprintf (key, sizeof(key), "volume%ld_password", volcount);
+        ret = dict_get_str (dict, key, &password);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to get %s for "
+                        "snap %s", key, snap->snapname);
+                goto out;
+        }
+        snprintf (key, sizeof(key) - 1, "vol%ld_volid", volcount);
+        ret = dict_get_bin (dict, key, (void **)&snap_volid);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Unable to fetch snap_volid");
+                goto out;
+        }
+
+        /* We are not setting the username and password here as
+         * we need to set the user name and password passed in
+         * the dictionary
+         */
+        ret = glusterd_volinfo_dup (origin_vol, &snap_vol, _gf_false);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to duplicate volinfo "
+                        "for the snapshot %s", snap->snapname);
+                goto out;
+        }
+
+        /* uuid is used as lvm snapshot name.
+           This will avoid restrictions on snapshot names provided by user */
+        GLUSTERD_GET_UUID_NOHYPHEN (snap_vol->volname, *snap_volid);
+        uuid_copy (snap_vol->volume_id, *snap_volid);
+        snap_vol->is_snap_volume = _gf_true;
+        strcpy (snap_vol->parent_volname, origin_vol->volname);
+        snap_vol->snapshot = snap;
+
+        glusterd_auth_set_username (snap_vol, username);
+        glusterd_auth_set_password (snap_vol, password);
+
+        /* Adding snap brickinfos to the snap volinfo */
+        brick_count = 0;
+        list_for_each_entry (brickinfo, &origin_vol->bricks, brick_list) {
+                snap_brickinfo = NULL;
+
+                ret = glusterd_brickinfo_new (&snap_brickinfo);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "initializing the brick for the snap "
+                                "volume failed (snapname: %s)", snap->snapname);
+                        goto out;
+                }
+
+                ret = glusterd_add_bricks_to_snap_volume (dict, rsp_dict,
+                                                          snap_vol,
+                                                          brickinfo,
+                                                          snap_brickinfo,
+                                                          &snap_brick_dir,
+                                                          volcount,
+                                                          brick_count);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Failed to add the snap brick for "
+                                "%s:%s to the snap volume",
+                                brickinfo->hostname, brickinfo->path);
+                        GF_FREE (snap_brickinfo);
+                        goto out;
+                }
+
+                /* Take snapshot of the brick */
+                if ((uuid_compare (brickinfo->uuid, MY_UUID)) ||
+                    (snap_brickinfo->snap_status == -1)) {
+                        brick_count++;
+                        continue;
+                }
+
+                ret = glusterd_take_brick_snapshot (origin_vol, snap_vol,
+                                                    rsp_dict, brickinfo,
+                                                    snap_brickinfo,
+                                                    snap_brick_dir,
+                                                    brick_count);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Failed to take snapshot for %s:%s",
+                                brickinfo->hostname, brickinfo->path);
+                        goto out;
+                }
+
+                brick_count++;
+        }
+
+        /*TODO: the quorum check of the snap volume here */
+
+        ret = glusterd_store_volinfo (snap_vol,
+                                      GLUSTERD_VOLINFO_VER_AC_INCREMENT);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to store snapshot "
+                        "volinfo (%s) for snap %s", snap_vol->volname,
+                        snap->snapname);
+                goto out;
+        }
+
+        ret = generate_brick_volfiles (snap_vol);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "generating the brick "
+                        "volfiles for the snap %s (volume: %s) failed",
+                        snap->snapname, origin_vol->volname);
+                goto out;
+        }
+
+        ret = generate_client_volfiles (snap_vol, GF_CLIENT_TRUSTED);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "generating the trusted "
+                        "client volfiles for the snap %s (volume: %s) failed",
+                        snap->snapname, origin_vol->volname);
+                goto out;
+        }
+        ret = generate_client_volfiles (snap_vol, GF_CLIENT_OTHER);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "generating the client "
+                        "volfiles for the snap %s (volume: %s) failed",
+                        snap->snapname, origin_vol->volname);
+                goto out;
+        }
+
+        ret = glusterd_list_add_snapvol (origin_vol, snap_vol);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "could not add the snap "
+                        "volume %s to the list", snap_vol->volname);
+                goto out;
+        }
+
+        list_for_each_entry (brickinfo, &snap_vol->bricks, brick_list) {
+                if (uuid_compare (brickinfo->uuid, MY_UUID))
+                        continue;
+
+                if (brickinfo->snap_status == -1) {
+                        gf_log (this->name, GF_LOG_INFO,
+                                "not starting snap brick %s:%s for "
+                                "for the snap %s (volume: %s)",
+                                brickinfo->hostname, brickinfo->path,
+                                snap->snapname, origin_vol->volname);
+                        continue;
+                }
+
+                ret = glusterd_brick_start (snap_vol, brickinfo, _gf_true);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_WARNING, "starting the "
+                                "brick %s:%s for the snap %s (volume: %s) "
+                                "failed", brickinfo->hostname, brickinfo->path,
+                                snap->snapname, origin_vol->volname);
+                        goto out;
+                }
+        }
+
+        snap_vol->status = GLUSTERD_STATUS_STARTED;
+        ret = glusterd_store_volinfo (snap_vol,
+                                      GLUSTERD_VOLINFO_VER_AC_INCREMENT);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Failed to store snap volinfo");
+                goto out;
+        }
+
+out:
+        if (ret) {
+                if (snap_vol)
+                        glusterd_snap_volume_remove (rsp_dict, snap_vol,
+                                                     _gf_true, _gf_true);
+                snap_vol = NULL;
+        }
+
+        return snap_vol;
+}
+
+/* This is a snapshot remove handler function. This function will be
+ * executed in the originator node. This function is responsible for
+ * calling mgmt v3 framework to do the actual remove on all the bricks
+ *
+ * @param req           RPC request object
+ * @param op            gluster operation
+ * @param dict          dictionary containing snapshot remove request
+ * @param err_str       In case of an err this string should be populated
+ * @param len           length of err_str buffer
+ *
+ * @return              Negative value on Failure and 0 in success
+ */
+int
+glusterd_handle_snapshot_remove (rpcsvc_request_t *req, glusterd_op_t op,
+                                 dict_t *dict, char *err_str, size_t len)
+{
+        int                      ret            = -1;
+        int64_t                  volcount       = 0;
+        char                    *snapname       = NULL;
+        char                    *volname        = NULL;
+        char                     key[PATH_MAX]  = "";
+        glusterd_snap_t         *snap           = NULL;
+        glusterd_volinfo_t      *snap_vol       = NULL;
+        glusterd_volinfo_t      *tmp            = NULL;
+        xlator_t                *this           = NULL;
+
+        this = THIS;
+
+        GF_ASSERT (req);
+        GF_ASSERT (dict);
+        GF_ASSERT (err_str);
+
+        ret = dict_get_str (dict, "snapname", &snapname);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to get snapname");
+                goto out;
+        }
+
+        snap = glusterd_find_snap_by_name (snapname);
+        if (!snap) {
+                snprintf (err_str, len, "Snap (%s) does not exist", snapname);
+                gf_log (this->name, GF_LOG_ERROR,
+                        "%s", err_str);
+                ret = -1;
+                goto out;
+        }
+
+        /* Set volnames in the dict to get mgmt_v3 lock */
+        list_for_each_entry_safe (snap_vol, tmp, &snap->volumes, vol_list) {
+                volcount++;
+                volname = gf_strdup (snap_vol->parent_volname);
+                if (!volname) {
+                        ret = -1;
+                        gf_log (this->name, GF_LOG_ERROR, "strdup failed");
+                        goto out;
+                }
+
+                snprintf (key, sizeof (key), "volname%ld", volcount);
+                ret = dict_set_dynstr (dict, key, volname);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR, "Failed to set "
+                                "volume name in dictionary");
+                        GF_FREE (volname);
+                        goto out;
+                }
+                volname = NULL;
+        }
+        ret = dict_set_int64 (dict, "volcount", volcount);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to set volcount");
+                goto out;
+        }
+
+        ret = glusterd_mgmt_v3_initiate_snap_phases (req, op, dict);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to initiate snap "
+                        "phases");
+                goto out;
+        }
+
+        ret = 0;
+out:
+        return ret;
+}
+
+int
+glusterd_snapshot_remove_prevalidate (dict_t *dict, char **op_errstr,
+                                      dict_t *rsp_dict)
+{
+        int32_t             ret          = -1;
+        char               *snapname     = NULL;
+        xlator_t           *this        = NULL;
+        glusterd_snap_t    *snap        = NULL;
+
+        this = THIS;
+
+        if (!dict || !op_errstr) {
+                gf_log (this->name, GF_LOG_ERROR, "input parameters NULL");
+                goto out;
+        }
+
+        ret = dict_get_str (dict, "snapname", &snapname);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Getting the snap name "
+                        "failed");
+                goto out;
+        }
+
+        snap = glusterd_find_snap_by_name (snapname);
+        if (!snap) {
+                gf_log (this->name, GF_LOG_ERROR, "Snap %s does not exist",
+                        snapname);
+                ret = -1;
+                goto out;
+        }
+        ret = 0;
+out:
+        return ret;
+}
+
+int
+glusterd_snapshot_status_prevalidate (dict_t *dict, char **op_errstr,
+                                      dict_t *rsp_dict)
+{
+        int                     ret             =       -1;
+        char                    *snapname       =       NULL;
+        glusterd_conf_t         *conf           =       NULL;
+        xlator_t                *this           =       NULL;
+        int32_t                 cmd             =       -1;
+        glusterd_volinfo_t      *volinfo        =       NULL;
+        char                    *volname        =       NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        conf = this->private;
+
+        GF_ASSERT (conf);
+        GF_ASSERT (op_errstr);
+        if (!dict) {
+                gf_log (this->name, GF_LOG_ERROR, "Input dict is NULL");
+                goto out;
+        }
+
+        ret = dict_get_int32 (dict, "cmd", &cmd);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Could not fetch status cmd");
+                goto out;
+        }
+
+        switch (cmd) {
+                case GF_SNAP_STATUS_TYPE_ALL:
+                {
+                        break;
+                }
+                case GF_SNAP_STATUS_TYPE_SNAP:
+                {
+                        ret = dict_get_str (dict, "snapname", &snapname);
+                        if (ret) {
+                                gf_log (this->name, GF_LOG_ERROR,
+                                        "Could not fetch snapname");
+                                goto out;
+                        }
+
+                        if (!glusterd_find_snap_by_name (snapname)) {
+                                ret = gf_asprintf (op_errstr, "Snap (%s) "
+                                                  "not found", snapname);
+                                if (ret < 0) {
+                                        goto out;
+                                }
+                                ret = -1;
+                                gf_log (this->name, GF_LOG_ERROR, "Snap (%s) "
+                                        "not found", snapname);
+                                goto out;
+                        }
+                        break;
+                }
+                case GF_SNAP_STATUS_TYPE_VOL:
+                {
+                        ret = dict_get_str (dict, "volname", &volname);
+                        if (ret) {
+                                gf_log (this->name, GF_LOG_ERROR,
+                                        "Could not fetch volname");
+                                goto out;
+                        }
+
+                        ret = glusterd_volinfo_find (volname, &volinfo);
+                        if (ret) {
+                                ret = gf_asprintf (op_errstr, "Volume (%s)"
+                                                  "not found", volname);
+                                if (ret < 0) {
+                                        goto out;
+                                }
+                                ret = -1;
+                                gf_log (this->name, GF_LOG_ERROR, "Volume "
+                                        "%s not present", volname);
+                                goto out;
+                        }
+                        break;
+
+                }
+                default:
+                {
+                        gf_log (this->name, GF_LOG_ERROR, "Invalid command");
+                        break;
+                }
+        }
+        ret = 0;
+
+out:
+        return ret;
+}
+
+int32_t
+glusterd_snapshot_remove_commit (dict_t *dict, char **op_errstr,
+                                 dict_t *rsp_dict)
+{
+        int32_t                   ret                  = -1;
+        char                     *snapname             = NULL;
+        char                     *dup_snapname         = NULL;
+        glusterd_snap_t          *snap                 = NULL;
+        glusterd_conf_t          *priv                 = NULL;
+        glusterd_volinfo_t       *snap_volinfo         = NULL;
+        xlator_t                 *this                 = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (dict);
+        GF_ASSERT (rsp_dict);
+        GF_ASSERT (op_errstr);
+
+        priv = this->private;
+        GF_ASSERT (priv);
+
+        if (!dict || !op_errstr) {
+                gf_log (this->name, GF_LOG_ERROR, "input parameters NULL");
+                goto out;
+        }
+
+        ret = dict_get_str (dict, "snapname", &snapname);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Getting the snap name "
+                        "failed");
+                goto out;
+        }
+
+        snap = glusterd_find_snap_by_name (snapname);
+        if (!snap) {
+                gf_log (this->name, GF_LOG_ERROR, "Snap %s does not exist",
+                        snapname);
+                ret = -1;
+                goto out;
+        }
+
+        if (is_origin_glusterd (dict) == _gf_true) {
+                /* TODO : As of now there is only volume in snapshot.
+                 * Change this when multiple volume snapshot is introduced
+                 */
+                snap_volinfo = list_entry (snap->volumes.next,
+                                           glusterd_volinfo_t,
+                                           vol_list);
+                if (!snap_volinfo) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Unable to fetch snap_volinfo");
+                        ret = -1;
+                        goto out;
+                }
+
+                /* From origin glusterd check if      *
+                 * any peers with snap bricks is down */
+                ret = glusterd_find_missed_snap (rsp_dict, snap_volinfo,
+                                                 snap_volinfo->volname,
+                                                 &priv->peers,
+                                                 GF_SNAP_OPTION_TYPE_DELETE);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Failed to find missed snap deletes");
+                        goto out;
+                }
+        }
+
+        ret = glusterd_snap_remove (rsp_dict, snap, _gf_true, _gf_false);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to remove snap %s",
+                        snapname);
+                goto out;
+        }
+
+        dup_snapname = gf_strdup (snapname);
+        if (!dup_snapname) {
+                gf_log (this->name, GF_LOG_ERROR, "Strdup failed");
+                ret = -1;
+                goto out;
+        }
+
+        ret = dict_set_dynstr (rsp_dict, "snapname", dup_snapname);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to set the snapname");
+                GF_FREE (dup_snapname);
+                goto out;
+        }
+
+        ret = 0;
+out:
+        return ret;
+}
+
+int32_t
+glusterd_do_snap_cleanup (dict_t *dict, char **op_errstr, dict_t *rsp_dict)
+{
+        int32_t                  ret                   = -1;
+        char                     *name                 = NULL;
+        xlator_t                 *this                 = NULL;
+        glusterd_conf_t          *conf                 = NULL;
+        glusterd_volinfo_t       *volinfo              = NULL;
+        glusterd_snap_t          *snap                 = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        conf = this->private;
+        GF_ASSERT (conf);
+
+        if (!dict || !op_errstr) {
+                gf_log (this->name, GF_LOG_ERROR, "input parameters NULL");
+                goto out;
+        }
+
+        ret = dict_get_str (dict, "snapname", &name);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "getting the snap "
+                        "name failed (volume: %s)", volinfo->volname);
+                goto out;
+        }
+
+        /*
+          If the snapname is not found that means the failure happened at
+          staging, or in commit, before the snap object is created, in which
+          case there is nothing to cleanup. So set ret to 0.
+        */
+        snap = glusterd_find_snap_by_name (name);
+        if (!snap) {
+                gf_log (this->name, GF_LOG_INFO, "snap %s is not found", name);
+                ret = 0;
+                goto out;
+        }
+
+        ret = glusterd_snap_remove (rsp_dict, snap, _gf_true, _gf_true);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "removing the snap %s failed",
+                        name);
+                goto out;
+        }
+
+        name = NULL;
+
+        ret = 0;
+
+out:
+
+        return ret;
+}
+
+/* In case of a successful, delete or create operation, during post_validate *
+ * look for missed snap operations and update the missed snap lists */
+int32_t
+glusterd_snapshot_update_snaps_post_validate (dict_t *dict, char **op_errstr,
+                                              dict_t *rsp_dict)
+{
+        int32_t                  ret                    = -1;
+        int32_t                  missed_snap_count      = -1;
+        xlator_t                *this                   = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (dict);
+        GF_ASSERT (rsp_dict);
+        GF_ASSERT (op_errstr);
+
+        ret = dict_get_int32 (dict, "missed_snap_count",
+                              &missed_snap_count);
+        if (ret) {
+                gf_log (this->name, GF_LOG_DEBUG, "No missed snaps");
+                ret = 0;
+                goto out;
+        }
+
+        ret = glusterd_store_update_missed_snaps (dict, missed_snap_count);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Failed to update missed_snaps_list");
+                goto out;
+        }
+
+out:
+        gf_log (this->name, GF_LOG_TRACE, "Returning %d", ret);
+        return ret;
+}
+
+int32_t
+glusterd_snapshot_create_commit (dict_t *dict, char **op_errstr,
+                                 dict_t *rsp_dict)
+{
+        int                     ret                     = -1;
+        int64_t                 i                       = 0;
+        int64_t                 volcount                = 0;
+        char                    *snapname               = NULL;
+        char                    *volname                = NULL;
+        char                    *tmp_name               = NULL;
+        char                    key[PATH_MAX]           = "";
+        xlator_t                *this                   = NULL;
+        glusterd_snap_t         *snap                   = NULL;
+        glusterd_volinfo_t      *origin_vol             = NULL;
+        glusterd_volinfo_t      *snap_vol               = NULL;
+        glusterd_conf_t *priv   = NULL;
+
+        this = THIS;
+        GF_ASSERT(this);
+        GF_ASSERT(dict);
+        GF_ASSERT(op_errstr);
+        GF_ASSERT(rsp_dict);
+        priv = this->private;
+        GF_ASSERT(priv);
+
+        ret = dict_get_int64 (dict, "volcount", &volcount);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "failed to "
+                        "get the volume count");
+                goto out;
+        }
+
+        ret = dict_get_str (dict, "snapname", &snapname);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Unable to fetch snapname");
+                goto out;
+        }
+        tmp_name = gf_strdup (snapname);
+        if (!tmp_name) {
+                gf_log (this->name, GF_LOG_ERROR, "Out of memory");
+                ret = -1;
+                goto out;
+        }
+
+        ret = dict_set_dynstr (rsp_dict, "snapname", tmp_name);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Unable to set snapname in rsp_dict");
+                GF_FREE (tmp_name);
+                goto out;
+        }
+        tmp_name = NULL;
+
+        snap = glusterd_create_snap_object (dict, rsp_dict);
+        if (!snap) {
+                gf_log (this->name, GF_LOG_ERROR, "creating the"
+                        "snap object %s failed", snapname);
+                ret = -1;
+                goto out;
+        }
+
+        for (i = 1; i <= volcount; i++) {
+                snprintf (key, sizeof (key), "volname%ld", i);
+                ret = dict_get_str (dict, key, &volname);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "failed to get volume name");
+                        goto out;
+                }
+
+                ret = glusterd_volinfo_find (volname, &origin_vol);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "failed to get the volinfo for "
+                                "the volume %s", volname);
+                        goto out;
+                }
+
+                /* TODO: Create a stub where the bricks are
+                   added parallely by worker threads so that
+                   the snap creating happens parallely.  */
+                snap_vol = glusterd_do_snap_vol (origin_vol, snap, dict,
+                                                 rsp_dict, i);
+                if (!snap_vol) {
+                        ret = -1;
+                        gf_log (this->name, GF_LOG_WARNING, "taking the "
+                                "snapshot of the volume %s failed", volname);
+                        goto out;
+                }
+        }
+
+        snap->snap_status = GD_SNAP_STATUS_IN_USE;
+        ret = glusterd_store_snap (snap);
+        if (ret) {
+                gf_log (this->name, GF_LOG_WARNING, "Could not store snap"
+                        "object %s", snap->snapname);
+                goto out;
+        }
+
+        ret = 0;
+
+out:
+        if (ret) {
+                if (snap)
+                        glusterd_snap_remove (rsp_dict, snap,
+                                              _gf_true, _gf_true);
+                snap = NULL;
+        }
+
+        gf_log (this->name, GF_LOG_TRACE, "Returning %d", ret);
+        return ret;
+}
+
+int
+snap_max_hard_limit_set_commit (dict_t *dict, uint64_t value,
+                                char *volname, char **op_errstr)
+{
+        char                err_str[PATH_MAX]    = "";
+        glusterd_conf_t    *conf                 = NULL;
+        glusterd_volinfo_t *volinfo              = NULL;
+        int                 ret                  = -1;
+        xlator_t           *this                 = NULL;
+
+        this = THIS;
+
+        GF_ASSERT (this);
+        GF_ASSERT (dict);
+        GF_ASSERT (volname);
+        GF_ASSERT (op_errstr);
+
+        conf = this->private;
+
+        GF_ASSERT (conf);
+
+        /* TODO: Initiate auto deletion when there is a limit change */
+        if (!volname) {
+                /* For system limit */
+                conf->snap_max_hard_limit = value;
+
+                ret = glusterd_store_global_info (this);
+                if (ret) {
+                        snprintf (err_str, PATH_MAX, "Failed to store "
+                                  "snap-max-hard-limit for system");
+                        goto out;
+                }
+        } else {
+               /*  For one volume */
+                ret = glusterd_volinfo_find (volname, &volinfo);
+                if (ret) {
+                        snprintf (err_str, PATH_MAX, "Failed to get the"
+                                   " volinfo for volume %s", volname);
+                        goto out;
+                }
+
+                volinfo->snap_max_hard_limit = value;
+
+                ret = glusterd_store_volinfo (volinfo,
+                                        GLUSTERD_VOLINFO_VER_AC_INCREMENT);
+                if (ret) {
+                        snprintf (err_str, PATH_MAX, "Failed to store "
+                                 "snap-max-hard-limit for volume %s", volname);
+                        goto out;
+                }
+        }
+
+        ret = 0;
+out:
+        if (ret) {
+                *op_errstr = gf_strdup (err_str);
+                gf_log (this->name, GF_LOG_ERROR, "%s", err_str);
+        }
+        return ret;
+}
+
+int
+snap_max_limits_display_commit (dict_t *rsp_dict, char *volname,
+                                char **op_errstr)
+{
+        char                err_str[PATH_MAX]    = "";
+        char                buf[PATH_MAX]        = "";
+        glusterd_conf_t    *conf                 = NULL;
+        glusterd_volinfo_t *volinfo              = NULL;
+        int                 ret                  = -1;
+        uint64_t            active_hard_limit    = 0;
+        uint64_t            snap_max_limit       = 0;
+        uint64_t            soft_limit_value     = -1;
+        uint64_t            count                = 0;
+        xlator_t           *this                 = NULL;
+
+        this = THIS;
+
+        GF_ASSERT (this);
+        GF_ASSERT (rsp_dict);
+        GF_ASSERT (volname);
+        GF_ASSERT (op_errstr);
+
+        conf = this->private;
+
+        GF_ASSERT (conf);
+
+        if (!volname) {
+                /* For system limit */
+                list_for_each_entry (volinfo, &conf->volumes, vol_list) {
+                        if (volinfo->is_snap_volume == _gf_true)
+                                continue;
+                        snap_max_limit = volinfo->snap_max_hard_limit;
+                        if (snap_max_limit > conf->snap_max_hard_limit)
+                                active_hard_limit = conf->snap_max_hard_limit;
+                        else
+                                active_hard_limit = snap_max_limit;
+                        soft_limit_value = (active_hard_limit *
+                                            conf->snap_max_soft_limit) / 100;
+
+                        snprintf (buf, sizeof(buf), "volume%ld-volname", count);
+                        ret = dict_set_str (rsp_dict, buf, volinfo->volname);
+                        if (ret) {
+                                snprintf (err_str, PATH_MAX,
+                                          "Failed to set %s", buf);
+                                goto out;
+                        }
+
+                        snprintf (buf, sizeof(buf),
+                                  "volume%ld-snap-max-hard-limit", count);
+                        ret = dict_set_uint64 (rsp_dict, buf, snap_max_limit);
+                        if (ret) {
+                                snprintf (err_str, PATH_MAX,
+                                          "Failed to set %s", buf);
+                                goto out;
+                        }
+
+                        snprintf (buf, sizeof(buf),
+                                  "volume%ld-active-hard-limit", count);
+                        ret = dict_set_uint64 (rsp_dict, buf,
+                                               active_hard_limit);
+                        if (ret) {
+                                snprintf (err_str, PATH_MAX,
+                                          "Failed to set %s", buf);
+                                goto out;
+                        }
+
+                        snprintf (buf, sizeof(buf),
+                                  "volume%ld-snap-max-soft-limit", count);
+                        ret = dict_set_uint64 (rsp_dict, buf, soft_limit_value);
+                        if (ret) {
+                                snprintf (err_str, PATH_MAX,
+                                          "Failed to set %s", buf);
+                                goto out;
+                        }
+                        count++;
+                }
+
+                ret = dict_set_uint64 (rsp_dict, "voldisplaycount", count);
+                if (ret) {
+                        snprintf (err_str, PATH_MAX,
+                                  "Failed to set voldisplaycount");
+                        goto out;
+                }
+        } else {
+                /*  For one volume */
+                ret = glusterd_volinfo_find (volname, &volinfo);
+                if (ret) {
+                        snprintf (err_str, PATH_MAX, "Failed to get the"
+                                   " volinfo for volume %s", volname);
+                        goto out;
+                }
+
+                snap_max_limit = volinfo->snap_max_hard_limit;
+                if (snap_max_limit > conf->snap_max_hard_limit)
+                        active_hard_limit = conf->snap_max_hard_limit;
+                else
+                        active_hard_limit = snap_max_limit;
+
+                soft_limit_value = (active_hard_limit *
+                                    conf->snap_max_soft_limit) / 100;
+
+                snprintf (buf, sizeof(buf), "volume%ld-volname", count);
+                ret = dict_set_str (rsp_dict, buf, volinfo->volname);
+                if (ret) {
+                        snprintf (err_str, PATH_MAX,
+                                  "Failed to set %s", buf);
+                        goto out;
+                }
+
+                snprintf (buf, sizeof(buf),
+                          "volume%ld-snap-max-hard-limit", count);
+                ret = dict_set_uint64 (rsp_dict, buf, snap_max_limit);
+                if (ret) {
+                        snprintf (err_str, PATH_MAX,
+                                  "Failed to set %s", buf);
+                        goto out;
+                }
+
+                snprintf (buf, sizeof(buf),
+                          "volume%ld-active-hard-limit", count);
+                ret = dict_set_uint64 (rsp_dict, buf, active_hard_limit);
+                if (ret) {
+                        snprintf (err_str, PATH_MAX,
+                                  "Failed to set %s", buf);
+                        goto out;
+                }
+
+                snprintf (buf, sizeof(buf),
+                          "volume%ld-snap-max-soft-limit", count);
+                ret = dict_set_uint64 (rsp_dict, buf, soft_limit_value);
+                if (ret) {
+                        snprintf (err_str, PATH_MAX,
+                                  "Failed to set %s", buf);
+                        goto out;
+                }
+
+                count++;
+
+                ret = dict_set_uint64 (rsp_dict, "voldisplaycount", count);
+                if (ret) {
+                        snprintf (err_str, PATH_MAX,
+                                  "Failed to set voldisplaycount");
+                        goto out;
+                }
+
+        }
+
+        ret = dict_set_uint64 (rsp_dict, "snap-max-hard-limit",
+                               conf->snap_max_hard_limit);
+        if (ret) {
+                snprintf (err_str, PATH_MAX,
+                          "Failed to set sys-snap-max-hard-limit ");
+                goto out;
+        }
+
+        ret = dict_set_uint64 (rsp_dict, "snap-max-soft-limit",
+                               conf->snap_max_soft_limit);
+        if (ret) {
+                snprintf (err_str, PATH_MAX,
+                          "Failed to set sys-snap-max-hard-limit ");
+                goto out;
+        }
+
+        ret = 0;
+out:
+        if (ret) {
+                *op_errstr = gf_strdup (err_str);
+                gf_log (this->name, GF_LOG_ERROR, "%s", err_str);
+        }
+        return ret;
+}
+
+int
+glusterd_snapshot_config_commit (dict_t *dict, char **op_errstr,
+                                 dict_t *rsp_dict)
+{
+        char               *volname              = NULL;
+        xlator_t           *this                 = NULL;
+        int                 ret                  = -1;
+        char                err_str[PATH_MAX]    = {0,};
+        glusterd_conf_t    *conf                 = NULL;
+        int                 config_command       = 0;
+        uint64_t            hard_limit           = 0;
+        uint64_t            soft_limit           = 0;
+
+        this = THIS;
+
+        GF_ASSERT (this);
+        GF_ASSERT (dict);
+        GF_ASSERT (op_errstr);
+
+        conf = this->private;
+
+        GF_ASSERT (conf);
+
+        ret = dict_get_int32 (dict, "config-command", &config_command);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "failed to get config-command type");
+                goto out;
+        }
+
+        /* Ignore the return value of the following dict_get,
+         * as they are optional
+         */
+        ret = dict_get_str (dict, "volname", &volname);
+
+        ret = dict_get_uint64 (dict, "snap-max-hard-limit", &hard_limit);
+
+        ret = dict_get_uint64 (dict, "snap-max-soft-limit", &soft_limit);
+
+        switch (config_command) {
+        case GF_SNAP_CONFIG_TYPE_SET:
+                if (hard_limit) {
+                        /* Commit ops for snap-max-hard-limit */
+                        ret = snap_max_hard_limit_set_commit (dict, hard_limit,
+                                                              volname,
+                                                              op_errstr);
+                        if (ret) {
+                                gf_log (this->name, GF_LOG_ERROR,
+                                        "snap-max-hard-limit set "
+                                        "commit failed.");
+                                goto out;
+                        }
+                }
+
+                if (soft_limit) {
+                        /* For system limit */
+                        conf->snap_max_soft_limit = soft_limit;
+
+                        ret = glusterd_store_global_info (this);
+                        if (ret) {
+                                snprintf (err_str, PATH_MAX, "Failed to store "
+                                          "snap-max-soft-limit for system");
+                                *op_errstr = gf_strdup (err_str);
+                                gf_log (this->name, GF_LOG_ERROR, "%s",
+                                        err_str);
+                                goto out;
+                        }
+                }
+                break;
+
+        case GF_SNAP_CONFIG_DISPLAY:
+                /* Reading data from local node only */
+                if (!is_origin_glusterd (dict)) {
+                        ret = 0;
+                        break;
+                }
+
+                ret = snap_max_limits_display_commit (rsp_dict, volname,
+                                                      op_errstr);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "snap-max-limit "
+                                "display commit failed.");
+                        goto out;
+                }
+                break;
+        default:
+                break;
+        }
+
+out:
+        gf_log (this->name, GF_LOG_TRACE, "Returning %d", ret);
+        return ret;
+}
+
+int
+glusterd_get_brick_lvm_details (dict_t *rsp_dict,
+                               glusterd_brickinfo_t *brickinfo, char *volname,
+                                char *device, char *key_prefix)
+{
+
+        int                     ret             =       -1;
+        glusterd_conf_t         *priv           =       NULL;
+        runner_t                runner          =       {0,};
+        xlator_t                *this           =       NULL;
+        char                    msg[PATH_MAX]   =       "";
+        char                    buf[PATH_MAX]   =       "";
+        char                    *ptr            =       NULL;
+        char                    *token          =       NULL;
+        char                    key[PATH_MAX]   =       "";
+        char                    *value          =       NULL;
+
+        GF_ASSERT (rsp_dict);
+        GF_ASSERT (brickinfo);
+        GF_ASSERT (volname);
+        this = THIS;
+        GF_ASSERT (this);
+        priv = this->private;
+        GF_ASSERT (priv);
+
+        device = glusterd_get_brick_mount_details (brickinfo);
+        if (!device) {
+                gf_log (this->name, GF_LOG_ERROR, "Getting device name for "
+                        "the brick %s:%s failed", brickinfo->hostname,
+                         brickinfo->path);
+                goto out;
+        }
+        runinit (&runner);
+        snprintf (msg, sizeof (msg), "running lvs command, "
+                  "for getting snap status");
+        /* Using lvs command fetch the Volume Group name,
+         * Percentage of data filled and Logical Volume size
+         *
+         * "-o" argument is used to get the desired information,
+         * example : "lvs /dev/VolGroup/thin_vol -o vgname,lv_size",
+         * will get us Volume Group name and Logical Volume size.
+         *
+         * Here separator used is ":",
+         * for the above given command with separator ":",
+         * The output will be "vgname:lvsize"
+         */
+        runner_add_args (&runner, "lvs", device, "--noheading", "-o",
+                         "vg_name,data_percent,lv_size",
+                         "--separator", ":", NULL);
+        runner_redir (&runner, STDOUT_FILENO, RUN_PIPE);
+        runner_log (&runner, "", GF_LOG_DEBUG, msg);
+        ret = runner_start (&runner);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Could not perform lvs action");
+                goto end;
+        }
+        do {
+                ptr = fgets (buf, sizeof (buf),
+                             runner_chio (&runner, STDOUT_FILENO));
+
+                if (ptr == NULL)
+                        break;
+                token = strtok (buf, ":");
+                if (token != NULL) {
+                        while (token && token[0] == ' ')
+                                token++;
+                        if (!token) {
+                                ret = -1;
+                                gf_log (this->name, GF_LOG_ERROR,
+                                        "Invalid vg entry");
+                                goto end;
+                        }
+                        value = gf_strdup (token);
+                        if (!value) {
+                                ret = -1;
+                                goto end;
+                        }
+                        ret = snprintf (key, sizeof (key), "%s.vgname",
+                                        key_prefix);
+                        if (ret < 0) {
+                                goto end;
+                        }
+
+                        ret = dict_set_dynstr (rsp_dict, key, value);
+                        if (ret) {
+                                gf_log (this->name, GF_LOG_ERROR,
+                                        "Could not save vgname ");
+                                goto end;
+                        }
+                }
+
+                token = strtok (NULL, ":");
+                if (token != NULL) {
+                        value = gf_strdup (token);
+                        if (!value) {
+                                ret = -1;
+                                goto end;
+                        }
+                        ret = snprintf (key, sizeof (key), "%s.data",
+                                        key_prefix);
+                        if (ret < 0) {
+                                goto end;
+                        }
+
+                        ret = dict_set_dynstr (rsp_dict, key, value);
+                        if (ret) {
+                                gf_log (this->name, GF_LOG_ERROR,
+                                        "Could not save data percent ");
+                                goto end;
+                        }
+                }
+                token = strtok (NULL, ":");
+                if (token != NULL) {
+                        value = gf_strdup (token);
+                        if (!value) {
+                                ret = -1;
+                                goto end;
+                        }
+                        ret = snprintf (key, sizeof (key), "%s.lvsize",
+                                        key_prefix);
+                        if (ret < 0) {
+                                goto end;
+                        }
+
+                        ret = dict_set_dynstr (rsp_dict, key, value);
+                        if (ret) {
+                                gf_log (this->name, GF_LOG_ERROR,
+                                        "Could not save meta data percent ");
+                                goto end;
+                        }
+                }
+
+        } while (ptr != NULL);
+
+        ret = 0;
+
+end:
+        runner_end (&runner);
+
+out:
+        if (ret && value) {
+                GF_FREE (value);
+        }
+
+        return ret;
+}
+
+int
+glusterd_get_single_brick_status (char **op_errstr, dict_t *rsp_dict,
+                                 char *keyprefix, int index,
+                                 glusterd_volinfo_t *snap_volinfo,
+                                 glusterd_brickinfo_t *brickinfo)
+{
+        int             ret                     = -1;
+        xlator_t        *this                   = NULL;
+        glusterd_conf_t *priv                   = NULL;
+        char            key[PATH_MAX]           = "";
+        char            *device                 = NULL;
+        char            *value                  = NULL;
+        char            brick_path[PATH_MAX]    = "";
+        char            pidfile[PATH_MAX]       = "";
+        pid_t           pid                     = -1;
+
+        this = THIS;
+        GF_ASSERT (this);
+        priv = this->private;
+        GF_ASSERT (priv);
+
+        GF_ASSERT (op_errstr);
+        GF_ASSERT (rsp_dict);
+        GF_ASSERT (keyprefix);
+        GF_ASSERT (snap_volinfo);
+        GF_ASSERT (brickinfo);
+
+        ret = snprintf (key, sizeof (key), "%s.brick%d.path", keyprefix,
+                        index);
+        if (ret < 0) {
+                goto out;
+        }
+
+        ret = snprintf (brick_path, sizeof (brick_path),
+                        "%s:%s", brickinfo->hostname, brickinfo->path);
+        if (ret < 0) {
+                goto out;
+        }
+
+        value = gf_strdup (brick_path);
+        if (!value) {
+                ret = -1;
+                goto out;
+        }
+
+        ret = dict_set_dynstr (rsp_dict, key, value);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Unable to store "
+                        "brick_path %s", brickinfo->path);
+                goto out;
+        }
+
+        if (brickinfo->snap_status == -1) {
+                /* Setting vgname as "Pending Snapshot" */
+                value = gf_strdup ("Pending Snapshot");
+                if (!value) {
+                        ret = -1;
+                        goto out;
+                }
+
+                snprintf (key, sizeof (key), "%s.brick%d.vgname",
+                          keyprefix, index);
+                ret = dict_set_dynstr (rsp_dict, key, value);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Could not save vgname ");
+                        goto out;
+                }
+
+                ret = 0;
+                goto out;
+        }
+        value = NULL;
+
+        ret = snprintf (key, sizeof (key), "%s.brick%d.status",
+                        keyprefix, index);
+        if (ret < 0) {
+                goto out;
+        }
+
+        if (brickinfo->status == GF_BRICK_STOPPED) {
+                value = gf_strdup ("No");
+                if (!value) {
+                        ret = -1;
+                        goto out;
+                }
+                ret = dict_set_str (rsp_dict, key, value);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Could not save brick status");
+                        goto out;
+                }
+                value = NULL;
+        } else {
+                value = gf_strdup ("Yes");
+                if (!value) {
+                        ret = -1;
+                        goto out;
+                }
+                ret = dict_set_str (rsp_dict, key, value);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Could not save brick status");
+                        goto out;
+                }
+                value = NULL;
+
+                GLUSTERD_GET_BRICK_PIDFILE (pidfile, snap_volinfo,
+                                            brickinfo, priv);
+                ret = glusterd_is_service_running (pidfile, &pid);
+
+                ret = snprintf (key, sizeof (key), "%s.brick%d.pid",
+                                keyprefix, index);
+                if (ret < 0) {
+                        goto out;
+                }
+
+                ret = dict_set_int32 (rsp_dict, key, pid);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Could not save pid %d", pid);
+                        goto out;
+                }
+        }
+
+        ret = snprintf (key, sizeof (key), "%s.brick%d",
+                        keyprefix, index);
+        if (ret < 0) {
+                goto out;
+        }
+
+        ret = glusterd_get_brick_lvm_details (rsp_dict, brickinfo,
+                                              snap_volinfo->volname,
+                                              device, key);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to get "
+                        "brick LVM details");
+                goto out;
+        }
+out:
+        if (ret && value) {
+                GF_FREE (value);
+        }
+
+        return ret;
+}
+
+int
+glusterd_get_single_snap_status (char **op_errstr, dict_t *rsp_dict,
+                                 char *keyprefix, glusterd_snap_t *snap)
+{
+        int                      ret                 =       -1;
+        xlator_t                *this                =       NULL;
+        char                     key[PATH_MAX]       =       "";
+        char                     brickkey[PATH_MAX]  =       "";
+        glusterd_volinfo_t      *snap_volinfo        =       NULL;
+        glusterd_volinfo_t      *tmp_volinfo         =       NULL;
+        glusterd_brickinfo_t    *brickinfo           =       NULL;
+        int                      volcount            =       0;
+        int                      brickcount          =       0;
+
+        this = THIS;
+        GF_ASSERT (this);
+
+        GF_ASSERT (op_errstr);
+        GF_ASSERT (rsp_dict);
+        GF_ASSERT (keyprefix);
+        GF_ASSERT (snap);
+
+        list_for_each_entry_safe (snap_volinfo, tmp_volinfo, &snap->volumes,
+                                  vol_list) {
+                ret = snprintf (key, sizeof (key), "%s.vol%d", keyprefix,
+                                volcount);
+                if (ret < 0) {
+                        goto out;
+                }
+                list_for_each_entry (brickinfo, &snap_volinfo->bricks,
+                                     brick_list) {
+                        if (!glusterd_is_local_brick (this, snap_volinfo,
+                            brickinfo)) {
+                                brickcount++;
+                                continue;
+                        }
+
+                        ret = glusterd_get_single_brick_status (op_errstr,
+                                                  rsp_dict, key, brickcount,
+                                                  snap_volinfo, brickinfo);
+
+                        if (ret) {
+                                gf_log (this->name, GF_LOG_ERROR, "Getting "
+                                        "single snap status failed");
+                                goto out;
+                        }
+                        brickcount++;
+                }
+                ret = snprintf (brickkey, sizeof (brickkey), "%s.brickcount",
+                                key);
+                if (ret < 0) {
+                        goto out;
+                }
+
+                ret = dict_set_int32 (rsp_dict, brickkey, brickcount);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Could not save brick count");
+                        goto out;
+                }
+                volcount++;
+        }
+
+        ret = snprintf (key, sizeof (key), "%s.volcount", keyprefix);
+        if (ret < 0) {
+                goto out;
+        }
+
+        ret = dict_set_int32 (rsp_dict, key, volcount);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Could not save volcount");
+                goto out;
+        }
+
+out:
+
+        return ret;
+}
+
+int
+glusterd_get_each_snap_object_status (char **op_errstr, dict_t *rsp_dict,
+                                      glusterd_snap_t *snap, char *keyprefix)
+{
+        int                     ret             =       -1;
+        char                    key[PATH_MAX]   =       "";
+        char                    *temp           =       NULL;
+        xlator_t                *this           =       NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (op_errstr);
+        GF_ASSERT (rsp_dict);
+        GF_ASSERT (snap);
+        GF_ASSERT (keyprefix);
+
+        /* TODO : Get all the snap volume info present in snap object,
+         * as of now, There will be only one snapvolinfo per snap object
+         */
+        ret = snprintf (key, sizeof (key), "%s.snapname", keyprefix);
+        if (ret < 0) {
+                goto out;
+        }
+
+        temp = gf_strdup (snap->snapname);
+        if (temp == NULL) {
+                ret = -1;
+                goto out;
+        }
+        ret = dict_set_dynstr (rsp_dict, key, temp);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Could not save "
+                        "snap name");
+                goto out;
+        }
+
+        temp = NULL;
+
+        ret = snprintf (key, sizeof (key), "%s.uuid", keyprefix);
+        if (ret < 0) {
+                goto out;
+        }
+
+        temp = gf_strdup (uuid_utoa (snap->snap_id));
+        if (temp == NULL) {
+                ret = -1;
+                goto out;
+        }
+
+        ret = dict_set_dynstr (rsp_dict, key, temp);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Could not save "
+                        "snap UUID");
+                goto out;
+        }
+
+        temp = NULL;
+
+        ret = glusterd_get_single_snap_status (op_errstr, rsp_dict, keyprefix,
+                                               snap);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Could not get single snap status");
+                goto out;
+        }
+
+        ret = snprintf (key, sizeof (key), "%s.volcount", keyprefix);
+        if (ret < 0) {
+                goto out;
+        }
+
+        ret = dict_set_int32 (rsp_dict, key, 1);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Could not save volcount");
+                goto out;
+        }
+out:
+        if (ret && temp)
+                GF_FREE (temp);
+
+        return ret;
+}
+
+int
+glusterd_get_snap_status_of_volume (char **op_errstr, dict_t *rsp_dict,
+                                    char *volname, char *keyprefix) {
+        int                     ret              =       -1;
+        glusterd_volinfo_t      *snap_volinfo    =       NULL;
+        glusterd_volinfo_t      *temp_volinfo    =       NULL;
+        glusterd_volinfo_t      *volinfo         =       NULL;
+        char                    key[PATH_MAX]    =        "";
+        xlator_t                *this            =       NULL;
+        glusterd_conf_t         *priv            =       NULL;
+        int                     i                =        0;
+
+        this = THIS;
+        GF_ASSERT (this);
+        priv = this->private;
+        GF_ASSERT (priv);
+
+        GF_ASSERT (op_errstr);
+        GF_ASSERT (rsp_dict);
+        GF_ASSERT (volname);
+        GF_ASSERT (keyprefix);
+
+        ret = glusterd_volinfo_find (volname, &volinfo);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to get volinfo of "
+                        "volume %s", volname);
+                goto out;
+        }
+
+        list_for_each_entry_safe (snap_volinfo, temp_volinfo,
+                             &volinfo->snap_volumes, snapvol_list) {
+                ret = snprintf (key, sizeof (key), "status.snap%d", i);
+                if (ret < 0) {
+                        goto out;
+                }
+
+                ret = glusterd_get_each_snap_object_status (op_errstr,
+                                       rsp_dict, snap_volinfo->snapshot, key);
+
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR, "Function : "
+                                "glusterd_get_single_snap_status failed");
+                        goto out;
+                }
+                i++;
+        }
+
+        ret = dict_set_int32 (rsp_dict, "status.snapcount", i);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to save snapcount");
+                ret = -1;
+                goto out;
+        }
+out:
+        return ret;
+}
+
+int
+glusterd_get_all_snapshot_status (dict_t *dict, char **op_errstr,
+                              dict_t *rsp_dict)
+{
+        int32_t                 i               =       0;
+        int                     ret             =       -1;
+        char                    key[PATH_MAX]   =       "";
+        glusterd_conf_t         *priv           =       NULL;
+        glusterd_snap_t         *snap           =       NULL;
+        glusterd_snap_t         *tmp_snap       =       NULL;
+        xlator_t                *this           =       NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        priv = this->private;
+        GF_ASSERT (priv);
+
+        GF_ASSERT (dict);
+        GF_ASSERT (op_errstr);
+
+        list_for_each_entry_safe (snap, tmp_snap,
+                                  &priv->snapshots, snap_list) {
+                ret = snprintf (key, sizeof (key), "status.snap%d", i);
+                if (ret < 0) {
+                        goto out;
+                }
+
+                ret = glusterd_get_each_snap_object_status (op_errstr,
+                                                         rsp_dict, snap, key);
+
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR, "Could not get "
+                                "the details of a snap object: %s",
+                                snap->snapname);
+                        goto out;
+                }
+                i++;
+        }
+
+        ret = dict_set_int32 (rsp_dict, "status.snapcount", i);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Could not save snapcount");
+                goto out;
+        }
+
+        ret = 0;
+out:
+        return ret;
+}
+
+
+int
+glusterd_snapshot_status_commit (dict_t *dict, char **op_errstr,
+                                 dict_t *rsp_dict)
+{
+        xlator_t        *this             =       NULL;
+        int             ret               =       -1;
+        glusterd_conf_t *conf             =       NULL;
+        char            *get_buffer       =       NULL;
+        int32_t         cmd               =       -1;
+        char            *snapname         =       NULL;
+        glusterd_snap_t *snap             =       NULL;
+        char            *volname          =       NULL;
+
+        this = THIS;
+
+        GF_ASSERT (this);
+        GF_ASSERT (dict);
+        GF_ASSERT (op_errstr);
+
+        conf = this->private;
+
+        GF_ASSERT (conf);
+        ret = dict_get_int32 (dict, "cmd", &cmd);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Failed to get status cmd type");
+                goto out;
+        }
+
+        ret = dict_set_int32 (rsp_dict, "cmd", cmd);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Could not save status cmd in rsp dictionary");
+                goto out;
+        }
+        switch (cmd) {
+                case GF_SNAP_STATUS_TYPE_ALL:
+                {
+                        ret = glusterd_get_all_snapshot_status (dict, op_errstr,
+                                                           rsp_dict);
+                        if (ret) {
+                                gf_log (this->name, GF_LOG_ERROR, "Unable to "
+                                        "get snapshot status");
+                                goto out;
+                        }
+                        break;
+                }
+                case GF_SNAP_STATUS_TYPE_SNAP:
+                {
+
+                        ret = dict_get_str (dict, "snapname", &snapname);
+                        if (ret) {
+                                gf_log (this->name, GF_LOG_ERROR, "Unable to "
+                                        "get snap name");
+                                goto out;
+                        }
+
+                        snap = glusterd_find_snap_by_name (snapname);
+                        if (!snap) {
+                                ret = gf_asprintf (op_errstr, "Snap (%s) "
+                                                  "not found", snapname);
+                                if (ret < 0) {
+                                        goto out;
+                                }
+                                ret = -1;
+                                gf_log (this->name, GF_LOG_ERROR, "Unable to "
+                                        "get snap volinfo");
+                                goto out;
+                        }
+                        ret = glusterd_get_each_snap_object_status (op_errstr,
+                                          rsp_dict, snap, "status.snap0");
+                        if (ret) {
+                                gf_log (this->name, GF_LOG_ERROR, "Unable to "
+                                        "get status of snap %s", get_buffer);
+                                goto out;
+                        }
+                        break;
+                }
+                case GF_SNAP_STATUS_TYPE_VOL:
+                {
+                        ret = dict_get_str (dict, "volname", &volname);
+                        if (ret) {
+                                gf_log (this->name, GF_LOG_ERROR, "Unable to"
+                                        " get volume name");
+                                goto out;
+                        }
+
+                        ret = glusterd_get_snap_status_of_volume (op_errstr,
+                                           rsp_dict, volname, "status.vol0");
+                        if (ret) {
+                                gf_log (this->name, GF_LOG_ERROR, "Function :"
+                                        " glusterd_get_snap_status_of_volume "
+                                        "failed");
+                                goto out;
+                        }
+                }
+        }
+        ret = 0;
+out:
+        return ret;
+}
+
+int32_t
+glusterd_snapshot_create_postvalidate (dict_t *dict, int32_t op_ret,
+                                       char **op_errstr, dict_t *rsp_dict)
+{
+        xlator_t        *this           = NULL;
+        glusterd_conf_t *priv           = NULL;
+        int              ret            = -1;
+
+        this = THIS;
+
+        GF_ASSERT (this);
+        GF_ASSERT (dict);
+        GF_ASSERT (rsp_dict);
+
+        priv = this->private;
+        GF_ASSERT (priv);
+
+        if (op_ret) {
+                ret = glusterd_do_snap_cleanup (dict, op_errstr, rsp_dict);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_WARNING, "cleanup operation "
+                                "failed");
+                        goto out;
+                }
+        } else {
+                ret = glusterd_snapshot_update_snaps_post_validate (dict,
+                                                                    op_errstr,
+                                                                    rsp_dict);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR, "Failed to "
+                                "create snapshot");
+                        goto out;
+                }
+        }
+
+        ret = 0;
+out:
+        return ret;
+}
+
+int32_t
+glusterd_snapshot (dict_t *dict, char **op_errstr, dict_t *rsp_dict)
+{
+
+        xlator_t        *this           = NULL;
+        glusterd_conf_t *priv           = NULL;
+        int32_t          snap_command   = 0;
+        int              ret            = -1;
+
+        this = THIS;
+
+        GF_ASSERT (this);
+        GF_ASSERT (dict);
+        GF_ASSERT (rsp_dict);
+
+        priv = this->private;
+        GF_ASSERT (priv);
+
+        ret = dict_get_int32 (dict, "type", &snap_command);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "unable to get the type of "
+                        "the snapshot command");
+                goto out;
+        }
+
+        switch (snap_command) {
+        case (GF_SNAP_OPTION_TYPE_CREATE):
+                ret = glusterd_snapshot_create_commit (dict, op_errstr,
+                                                       rsp_dict);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR, "Failed to "
+                                "create snapshot");
+                        goto out;
+                }
+                break;
+
+        case GF_SNAP_OPTION_TYPE_CONFIG:
+                ret = glusterd_snapshot_config_commit (dict, op_errstr,
+                                                       rsp_dict);
+                break;
+
+        case GF_SNAP_OPTION_TYPE_DELETE:
+                ret = glusterd_snapshot_remove_commit (dict, op_errstr,
+                                                       rsp_dict);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR, "Failed to "
+                                "delete snapshot");
+                        goto out;
+                }
+                break;
+
+        case GF_SNAP_OPTION_TYPE_RESTORE:
+                ret = glusterd_snapshot_restore (dict, op_errstr,
+                                                 rsp_dict);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_WARNING, "Failed to "
+                                "restore snapshot");
+                        goto out;
+                }
+
+                break;
+
+        case GF_SNAP_OPTION_TYPE_STATUS:
+                ret = glusterd_snapshot_status_commit (dict, op_errstr,
+                                                       rsp_dict);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR, "Failed to "
+                                "show snapshot status");
+                        goto out;
+                }
+                break;
+
+
+        default:
+                gf_log (this->name, GF_LOG_WARNING, "invalid snap command");
+                goto out;
+                break;
+        }
+
+        ret = 0;
+
+out:
+        return ret;
+}
+
+int
+glusterd_snapshot_brickop (dict_t *dict, char **op_errstr, dict_t *rsp_dict)
+{
+        int            ret       = -1;
+        int64_t        vol_count = 0;
+        int64_t        count     = 1;
+        char           key[1024] = {0,};
+        char           *volname  = NULL;
+        int32_t        snap_command = 0;
+        xlator_t       *this     = NULL;
+
+        this = THIS;
+
+        GF_ASSERT (this);
+        GF_ASSERT (dict);
+        GF_ASSERT (rsp_dict);
+
+        ret = dict_get_int32 (dict, "type", &snap_command);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "unable to get the type of "
+                        "the snapshot command");
+                goto out;
+        }
+
+        switch (snap_command) {
+        case GF_SNAP_OPTION_TYPE_CREATE:
+                ret = dict_get_int64 (dict, "volcount", &vol_count);
+                if (ret)
+                        goto out;
+                while (count <= vol_count) {
+                        snprintf (key, 1024, "volname%"PRId64, count);
+                        ret = dict_get_str (dict, key, &volname);
+                        if (ret) {
+                                gf_log (this->name, GF_LOG_ERROR,
+                                        "Unable to get volname");
+                                goto out;
+                        }
+                        ret = dict_set_str (dict, "volname", volname);
+                        if (ret)
+                                goto out;
+
+                        ret = gd_brick_op_phase (GD_OP_SNAP, NULL, dict,
+                                        op_errstr);
+                        if (ret)
+                                goto out;
+                        volname = NULL;
+                        count++;
+                }
+
+                dict_del (dict, "volname");
+                ret = 0;
+                break;
+        case GF_SNAP_OPTION_TYPE_DELETE:
+                break;
+        default:
+                break;
+        }
+
+out:
+        return ret;
+}
+
+int
+glusterd_snapshot_prevalidate (dict_t *dict, char **op_errstr,
+                               dict_t *rsp_dict)
+{
+        int                snap_command          = 0;
+        xlator_t           *this                 = NULL;
+        int                ret                   = -1;
+
+        this = THIS;
+
+        GF_ASSERT (this);
+        GF_ASSERT (dict);
+        GF_ASSERT (rsp_dict);
+
+        ret = dict_get_int32 (dict, "type", &snap_command);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "unable to get the type of "
+                        "the snapshot command");
+                goto out;
+        }
+
+        switch (snap_command) {
+        case (GF_SNAP_OPTION_TYPE_CREATE):
+                ret = glusterd_snapshot_create_prevalidate (dict, op_errstr,
+                                                            rsp_dict);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_WARNING, "Snapshot create "
+                                "pre-validation failed");
+                        goto out;
+                }
+                break;
+
+        case (GF_SNAP_OPTION_TYPE_CONFIG):
+                ret = glusterd_snapshot_config_prevalidate (dict, op_errstr);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_WARNING, "Snapshot config "
+                                "pre-validation failed");
+                        goto out;
+                }
+                break;
+
+        case GF_SNAP_OPTION_TYPE_RESTORE:
+                ret = glusterd_snapshot_restore_prevalidate (dict, op_errstr,
+                                                             rsp_dict);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_WARNING, "Snapshot restore "
+                                        "validation failed");
+                        goto out;
+                }
+                break;
+        case GF_SNAP_OPTION_TYPE_DELETE:
+                ret = glusterd_snapshot_remove_prevalidate (dict, op_errstr,
+                                                            rsp_dict);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_WARNING, "Snapshot remove "
+                                "validation failed");
+                        goto out;
+                }
+                break;
+
+        case GF_SNAP_OPTION_TYPE_STATUS:
+                ret = glusterd_snapshot_status_prevalidate (dict, op_errstr,
+                                                            rsp_dict);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_WARNING, "Snapshot status "
+                                "validation failed");
+                        goto out;
+                }
+                break;
+
+        default:
+                gf_log (this->name, GF_LOG_WARNING, "invalid snap command");
+                goto out;
+        }
+
+        ret = 0;
+out:
+        return ret;
+}
+
+int
+glusterd_snapshot_postvalidate (dict_t *dict, int32_t op_ret, char **op_errstr,
+                                dict_t *rsp_dict)
+{
+        int                snap_command          = 0;
+        xlator_t           *this                 = NULL;
+        int                ret                   = -1;
+
+        this = THIS;
+
+        GF_ASSERT (this);
+        GF_ASSERT (dict);
+        GF_ASSERT (rsp_dict);
+
+        ret = dict_get_int32 (dict, "type", &snap_command);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "unable to get the type of "
+                        "the snapshot command");
+                goto out;
+        }
+
+        switch (snap_command) {
+        case GF_SNAP_OPTION_TYPE_CREATE:
+                ret = glusterd_snapshot_create_postvalidate (dict, op_ret,
+                                                             op_errstr,
+                                                             rsp_dict);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_WARNING, "Snapshot create "
+                                "post-validation failed");
+                        goto out;
+                }
+                break;
+
+        case GF_SNAP_OPTION_TYPE_DELETE:
+        case GF_SNAP_OPTION_TYPE_RESTORE:
+                ret = glusterd_snapshot_update_snaps_post_validate (dict,
+                                                                    op_errstr,
+                                                                    rsp_dict);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR, "Failed to "
+                                "update missed snaps list");
+                        goto out;
+                }
+                break;
+
+        default:
+                gf_log (this->name, GF_LOG_WARNING, "invalid snap command");
+                goto out;
+        }
+
+        ret = 0;
+out:
+        return ret;
+}
+
+int
+glusterd_handle_snapshot_fn (rpcsvc_request_t *req)
+{
+        int32_t               ret            = 0;
+        dict_t               *dict           = NULL;
+        gf_cli_req            cli_req        = {{0},};
+        glusterd_op_t         cli_op         = GD_OP_SNAP;
+        int                   type           = 0;
+        glusterd_conf_t      *conf           = NULL;
+        char                 *host_uuid      = NULL;
+        char                  err_str[2048]  = {0,};
+        xlator_t             *this           = NULL;
+        char                 *volname        = NULL;
+
+        GF_ASSERT (req);
+
+        this = THIS;
+        GF_ASSERT (this);
+        conf = this->private;
+        GF_ASSERT (conf);
+
+        ret = xdr_to_generic (req->msg[0], &cli_req,
+                              (xdrproc_t)xdr_gf_cli_req);
+        if (ret < 0) {
+                req->rpc_err = GARBAGE_ARGS;
+                goto out;
+        }
+
+        if (cli_req.dict.dict_len > 0) {
+                dict = dict_new ();
+                if (!dict)
+                        goto out;
+
+                ret = dict_unserialize (cli_req.dict.dict_val,
+                                        cli_req.dict.dict_len,
+                                        &dict);
+                if (ret < 0) {
+                        gf_log (this->name, GF_LOG_ERROR, "failed to "
+                                "unserialize req-buffer to dictionary");
+                        snprintf (err_str, sizeof (err_str), "Unable to decode "
+                                  "the command");
+                        goto out;
+                }
+
+                dict->extra_stdfree = cli_req.dict.dict_val;
+
+                host_uuid = gf_strdup (uuid_utoa(MY_UUID));
+                if (host_uuid == NULL) {
+                        snprintf (err_str, sizeof (err_str), "Failed to get "
+                                  "the uuid of local glusterd");
+                        ret = -1;
+                        goto out;
+                }
+                ret = dict_set_dynstr (dict, "host-uuid", host_uuid);
+                if (ret) {
+                        GF_FREE (host_uuid);
+                        goto out;
+                }
+
+
+        } else {
+                gf_log (this->name, GF_LOG_ERROR, "request dict length is %d",
+                        cli_req.dict.dict_len);
+                goto out;
+        }
+
+        ret = dict_get_int32 (dict, "type", &type);
+        if (ret < 0) {
+                snprintf (err_str, sizeof (err_str), "Command type not found");
+                gf_log (this->name, GF_LOG_ERROR, "%s", err_str);
+                goto out;
+        }
+
+        switch (type) {
+        case GF_SNAP_OPTION_TYPE_CREATE:
+                ret = glusterd_handle_snapshot_create (req, cli_op, dict,
+                                                err_str, sizeof (err_str));
+                if (ret) {
+                        gf_log (this->name, GF_LOG_WARNING, "Snapshot create "
+                                        "failed: %s", err_str);
+                }
+                break;
+        case GF_SNAP_OPTION_TYPE_RESTORE:
+                ret = glusterd_handle_snapshot_restore (req, cli_op, dict,
+                                                err_str, sizeof (err_str));
+                if (ret) {
+                        gf_log (this->name, GF_LOG_WARNING, "Snapshot restore "
+                                        "failed: %s", err_str);
+                }
+
+                break;
+        case GF_SNAP_OPTION_TYPE_INFO:
+                ret = glusterd_handle_snapshot_info (req, cli_op, dict,
+                                                err_str, sizeof (err_str));
+                if (ret) {
+                        gf_log (this->name, GF_LOG_WARNING, "Snapshot info "
+                                        "failed");
+                }
+                break;
+        case GF_SNAP_OPTION_TYPE_LIST:
+                ret = glusterd_handle_snapshot_list (req, cli_op, dict,
+                                                err_str, sizeof (err_str));
+                if (ret) {
+                        gf_log (this->name, GF_LOG_WARNING, "Snapshot list "
+                                        "failed");
+                }
+                break;
+        case GF_SNAP_OPTION_TYPE_CONFIG:
+                /* TODO : Type of lock to be taken when we are setting
+                 * limits system wide
+                 */
+                ret = dict_get_str (dict, "volname", &volname);
+                if (!volname) {
+                        ret = dict_set_int32 (dict, "hold_vol_locks",
+                                              _gf_false);
+                        if (ret) {
+                                gf_log ("cli", GF_LOG_ERROR,
+                                        "Unable to set hold_vol_locks value "
+                                        "as _gf_false");
+                                goto out;
+                        }
+
+                }
+                ret = glusterd_mgmt_v3_initiate_all_phases (req, cli_op, dict);
+                break;
+        case GF_SNAP_OPTION_TYPE_DELETE:
+                ret = glusterd_handle_snapshot_remove (req, cli_op, dict,
+                                                       err_str,
+                                                       sizeof (err_str));
+                if (ret) {
+                        gf_log (this->name, GF_LOG_WARNING, "Snapshot delete "
+                                "failed: %s", err_str);
+                }
+                break;
+        case GF_SNAP_OPTION_TYPE_START:
+        case GF_SNAP_OPTION_TYPE_STOP:
+        case GF_SNAP_OPTION_TYPE_STATUS:
+                ret = glusterd_handle_snapshot_status (req, cli_op, dict,
+                                                       err_str,
+                                                       sizeof (err_str));
+                if (ret) {
+                        gf_log (this->name, GF_LOG_WARNING, "Snapshot status "
+                                "failed: %s", err_str);
+                }
+                break;
+        default:
+                gf_log (this->name, GF_LOG_ERROR, "Unkown snapshot request "
+                        "type (%d)", type);
+                ret = -1; /* Failure */
+        }
+
+out:
+        if (ret) {
+                if (err_str[0] == '\0')
+                        snprintf (err_str, sizeof (err_str),
+                                  "Operation failed");
+                ret = glusterd_op_send_cli_response (cli_op, ret, 0, req,
+                                                     dict, err_str);
+        }
+
+        return ret;
+}
+
+int
+glusterd_handle_snapshot (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req, glusterd_handle_snapshot_fn);
+}
+
+static inline void
+glusterd_free_snap_op (glusterd_snap_op_t *snap_op)
+{
+        if (snap_op) {
+                if (snap_op->brick_path)
+                        GF_FREE (snap_op->brick_path);
+
+                GF_FREE (snap_op);
+        }
+}
+
+/* Look for duplicates and accordingly update the list */
+int32_t
+glusterd_update_missed_snap_entry (glusterd_missed_snap_info *missed_snapinfo,
+                                   glusterd_snap_op_t *missed_snap_op)
+{
+        int32_t                        ret                         = -1;
+        glusterd_snap_op_t            *snap_opinfo                 = NULL;
+        gf_boolean_t                   match                       = _gf_false;
+        xlator_t                      *this                        = NULL;
+
+        this = THIS;
+        GF_ASSERT(this);
+        GF_ASSERT(missed_snapinfo);
+        GF_ASSERT(missed_snap_op);
+
+        list_for_each_entry (snap_opinfo, &missed_snapinfo->snap_ops,
+                             snap_ops_list) {
+                if ((!strcmp (snap_opinfo->brick_path,
+                              missed_snap_op->brick_path)) &&
+                    (snap_opinfo->op == missed_snap_op->op)) {
+                        /* If two entries have conflicting status
+                         * GD_MISSED_SNAP_DONE takes precedence
+                         */
+                        if ((snap_opinfo->status == GD_MISSED_SNAP_PENDING) &&
+                            (missed_snap_op->status == GD_MISSED_SNAP_DONE)) {
+                                snap_opinfo->status = GD_MISSED_SNAP_DONE;
+                                gf_log (this->name, GF_LOG_INFO,
+                                        "Updating missed snap status "
+                                        "for %s:%d:%s:%d as DONE",
+                                        missed_snapinfo->node_snap_info,
+                                        snap_opinfo->brick_num,
+                                        snap_opinfo->brick_path,
+                                        snap_opinfo->op);
+                                ret = 0;
+                                glusterd_free_snap_op (missed_snap_op);
+                                goto out;
+                        }
+                        match = _gf_true;
+                        break;
+                } else if ((snap_opinfo->brick_num ==
+                            missed_snap_op->brick_num) &&
+                            (snap_opinfo->op == GF_SNAP_OPTION_TYPE_CREATE) &&
+                            (missed_snap_op->op ==
+                             GF_SNAP_OPTION_TYPE_DELETE)) {
+                        /* Optimizing create and delete entries for the same
+                         * brick and same node
+                         */
+                        gf_log (this->name, GF_LOG_INFO,
+                                "Updating missed snap status "
+                                "for %s:%d:%s:%d as DONE",
+                                missed_snapinfo->node_snap_info,
+                                snap_opinfo->brick_num,
+                                snap_opinfo->brick_path,
+                                snap_opinfo->op);
+                        snap_opinfo->status = GD_MISSED_SNAP_DONE;
+                        ret = 0;
+                        glusterd_free_snap_op (missed_snap_op);
+                        goto out;
+                }
+        }
+
+        if (match == _gf_true) {
+                gf_log (this->name, GF_LOG_INFO,
+                        "Duplicate entry. Not updating");
+                glusterd_free_snap_op (missed_snap_op);
+        } else {
+                list_add_tail (&missed_snap_op->snap_ops_list,
+                               &missed_snapinfo->snap_ops);
+        }
+
+        ret = 0;
+out:
+        gf_log (this->name, GF_LOG_TRACE, "Returning %d", ret);
+        return ret;
+}
+
+/* Add new missed snap entry to the missed_snaps list. */
+int32_t
+glusterd_store_missed_snaps_list (char *missed_info, int32_t brick_num,
+                                  char *brick_path, int32_t snap_op,
+                                  int32_t snap_status)
+{
+        int32_t                        ret                         = -1;
+        glusterd_missed_snap_info     *missed_snapinfo             = NULL;
+        glusterd_snap_op_t            *missed_snap_op              = NULL;
+        glusterd_conf_t               *priv                        = NULL;
+        gf_boolean_t                   match                       = _gf_false;
+        gf_boolean_t                   free_missed_snap_info       = _gf_false;
+        xlator_t                      *this                        = NULL;
+
+        this = THIS;
+        GF_ASSERT(this);
+        GF_ASSERT(missed_info);
+        GF_ASSERT(brick_path);
+
+        priv = this->private;
+        GF_ASSERT (priv);
+
+        /* Create the snap_op object consisting of the *
+         * snap id and the op */
+        ret = glusterd_missed_snap_op_new (&missed_snap_op);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Failed to create new missed snap object.");
+                ret = -1;
+                goto out;
+        }
+
+        missed_snap_op->brick_path = gf_strdup(brick_path);
+        if (!missed_snap_op->brick_path) {
+                ret = -1;
+                goto out;
+        }
+        missed_snap_op->brick_num = brick_num;
+        missed_snap_op->op = snap_op;
+        missed_snap_op->status = snap_status;
+
+        /* Look for other entries for the same node and same snap */
+        list_for_each_entry (missed_snapinfo, &priv->missed_snaps_list,
+                             missed_snaps) {
+                if (!strcmp (missed_snapinfo->node_snap_info,
+                             missed_info)) {
+                        /* Found missed snapshot info for *
+                         * the same node and same snap */
+                        match = _gf_true;
+                        break;
+                }
+        }
+
+        if (match == _gf_false) {
+                /* First snap op missed for the brick */
+                ret = glusterd_missed_snapinfo_new (&missed_snapinfo);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Failed to create missed snapinfo");
+                        goto out;
+                }
+                free_missed_snap_info = _gf_true;
+                missed_snapinfo->node_snap_info = gf_strdup(missed_info);
+                if (!missed_snapinfo->node_snap_info) {
+                        ret = -1;
+                        goto out;
+                }
+
+                list_add_tail (&missed_snap_op->snap_ops_list,
+                               &missed_snapinfo->snap_ops);
+                list_add_tail (&missed_snapinfo->missed_snaps,
+                               &priv->missed_snaps_list);
+
+                ret = 0;
+                goto out;
+        } else {
+                ret = glusterd_update_missed_snap_entry (missed_snapinfo,
+                                                         missed_snap_op);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Failed to update existing missed snap entry.");
+                        goto out;
+                }
+        }
+
+out:
+        if (ret) {
+                glusterd_free_snap_op (missed_snap_op);
+
+                if (missed_snapinfo &&
+                    (free_missed_snap_info == _gf_true)) {
+                        if (missed_snapinfo->node_snap_info)
+                                GF_FREE (missed_snapinfo->node_snap_info);
+
+                        GF_FREE (missed_snapinfo);
+                }
+        }
+
+        gf_log (this->name, GF_LOG_TRACE, "Returning %d", ret);
+        return ret;
+}
+
+/* Add  missing snap entries to the in-memory conf->missed_snap_list */
+int32_t
+glusterd_add_missed_snaps_to_list (dict_t *dict, int32_t missed_snap_count)
+{
+        char                          *buf                         = NULL;
+        char                          *tmp                         = NULL;
+        char                          *save_ptr                    = NULL;
+        char                          *nodeid                      = NULL;
+        char                          *snap_uuid                   = NULL;
+        char                          *brick_path                  = NULL;
+        char                           missed_info[PATH_MAX]       = "";
+        char                           name_buf[PATH_MAX]          = "";
+        int32_t                        i                           = -1;
+        int32_t                        ret                         = -1;
+        int32_t                        brick_num                   = -1;
+        int32_t                        snap_op                     = -1;
+        int32_t                        snap_status                 = -1;
+        glusterd_conf_t               *priv                        = NULL;
+        xlator_t                      *this                        = NULL;
+
+        this = THIS;
+        GF_ASSERT(this);
+        GF_ASSERT(dict);
+
+        priv = this->private;
+        GF_ASSERT (priv);
+
+        /* We can update the missed_snaps_list without acquiring *
+         * any additional locks as big lock will be held.        */
+        for (i = 0; i < missed_snap_count; i++) {
+                snprintf (name_buf, sizeof(name_buf), "missed_snaps_%d",
+                          i);
+                ret = dict_get_str (dict, name_buf, &buf);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Unable to fetch %s", name_buf);
+                        goto out;
+                }
+
+                gf_log (this->name, GF_LOG_DEBUG, "missed_snap_entry = %s",
+                        buf);
+
+                /* Need to make a duplicate string coz the same dictionary *
+                 * is resent to the non-originator nodes */
+                tmp = gf_strdup (buf);
+                if (!tmp) {
+                        ret = -1;
+                        goto out;
+                }
+
+                /* Fetch the node-id, snap-id, brick_num,
+                 * brick_path, snap_op and snap status
+                 */
+                nodeid = strtok_r (tmp, ":", &save_ptr);
+                snap_uuid = strtok_r (NULL, "=", &save_ptr);
+                brick_num = atoi(strtok_r (NULL, ":", &save_ptr));
+                brick_path = strtok_r (NULL, ":", &save_ptr);
+                snap_op = atoi(strtok_r (NULL, ":", &save_ptr));
+                snap_status = atoi(strtok_r (NULL, ":", &save_ptr));
+
+                if (!nodeid || !snap_uuid || !brick_path ||
+                    brick_num < 1 || snap_op < 1 ||
+                    snap_status < 1) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Invalid missed_snap_entry");
+                        ret = -1;
+                        goto out;
+                }
+
+                snprintf (missed_info, sizeof(missed_info), "%s:%s",
+                          nodeid, snap_uuid);
+
+                ret = glusterd_store_missed_snaps_list (missed_info,
+                                                        brick_num,
+                                                        brick_path,
+                                                        snap_op,
+                                                        snap_status);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Failed to store missed snaps_list");
+                        goto out;
+                }
+
+                GF_FREE (tmp);
+                tmp = NULL;
+        }
+
+out:
+        if (tmp)
+                GF_FREE (tmp);
+
+        gf_log (this->name, GF_LOG_TRACE, "Returning %d", ret);
+        return ret;
+}
diff --git a/xlators/mgmt/glusterd/src/glusterd-store.c b/xlators/mgmt/glusterd/src/glusterd-store.c
index 085e3e85d..1c2ec58e8 100644
--- a/xlators/mgmt/glusterd/src/glusterd-store.c
+++ b/xlators/mgmt/glusterd/src/glusterd-store.c
@@ -1,5 +1,5 @@
 /*
-   Copyright (c) 2007-2012 Red Hat, Inc. <http://www.redhat.com>
+   Copyright (c) 2007-2013 Red Hat, Inc. <http://www.redhat.com>
    This file is part of GlusterFS.
 
    This file is licensed to you under your choice of the GNU Lesser
@@ -35,6 +35,7 @@
 #include "glusterd-op-sm.h"
 #include "glusterd-utils.h"
 #include "glusterd-hooks.h"
+#include "store.h"
 #include "glusterd-store.h"
 
 #include "rpc-clnt.h"
@@ -44,151 +45,8 @@
 #include <inttypes.h>
 #include <dirent.h>
 
-static int32_t
-glusterd_store_mkdir (char *path)
-{
-        int32_t     ret = -1;
-
-        ret = mkdir (path, 0777);
-
-        if ((-1 == ret) && (EEXIST != errno)) {
-                gf_log (THIS->name, GF_LOG_ERROR, "mkdir() failed on path %s,"
-                        "errno: %s", path, strerror (errno));
-        } else {
-                ret = 0;
-        }
-
-        return ret;
-}
-
-int32_t
-glusterd_store_handle_create_on_absence (glusterd_store_handle_t **shandle,
-                                         char *path)
-{
-        GF_ASSERT (shandle);
-        int32_t     ret = 0;
-
-        if (*shandle == NULL) {
-                ret = glusterd_store_handle_new (path, shandle);
-
-                if (ret) {
-                        gf_log (THIS->name, GF_LOG_ERROR, "Unable to create "
-                                "store handle for path: %s", path);
-                }
-        }
-        return ret;
-}
-
-int32_t
-glusterd_store_mkstemp (glusterd_store_handle_t *shandle)
-{
-        int     fd = -1;
-        char    tmppath[PATH_MAX] = {0,};
-
-        GF_ASSERT (shandle);
-        GF_ASSERT (shandle->path);
-
-        snprintf (tmppath, sizeof (tmppath), "%s.tmp", shandle->path);
-        fd = open (tmppath, O_RDWR | O_CREAT | O_TRUNC | O_SYNC, 0600);
-        if (fd <= 0) {
-                gf_log (THIS->name, GF_LOG_ERROR, "Failed to open %s, "
-                        "error: %s", tmppath, strerror (errno));
-        }
-
-        return fd;
-}
-
-int
-glusterd_store_sync_direntry (char *path)
-{
-        int             ret     = -1;
-        int             dirfd   = -1;
-        char            *dir    = NULL;
-        char            *pdir   = NULL;
-        xlator_t        *this = NULL;
-
-        this = THIS;
-
-        dir = gf_strdup (path);
-        if (!dir)
-                goto out;
-
-        pdir = dirname (dir);
-        dirfd = open (pdir, O_RDONLY);
-        if (dirfd == -1) {
-                gf_log (this->name, GF_LOG_ERROR, "Failed to open directory "
-                        "%s, due to %s", pdir, strerror (errno));
-                goto out;
-        }
-
-        ret = fsync (dirfd);
-        if (ret) {
-                gf_log (this->name, GF_LOG_ERROR, "Failed to fsync %s, due to "
-                        "%s", pdir, strerror (errno));
-                goto out;
-        }
-
-        ret = 0;
-out:
-        if (dirfd >= 0) {
-                ret = close (dirfd);
-                if (ret) {
-                        gf_log (this->name, GF_LOG_ERROR, "Failed to close "
-                                "%s, due to %s", pdir, strerror (errno));
-                }
-        }
-
-        if (dir)
-                GF_FREE (dir);
-
-        return ret;
-}
-
-int32_t
-glusterd_store_rename_tmppath (glusterd_store_handle_t *shandle)
-{
-        int32_t         ret = -1;
-        char            tmppath[PATH_MAX] = {0,};
-
-        GF_ASSERT (shandle);
-        GF_ASSERT (shandle->path);
-
-        snprintf (tmppath, sizeof (tmppath), "%s.tmp", shandle->path);
-        ret = rename (tmppath, shandle->path);
-        if (ret) {
-                gf_log (THIS->name, GF_LOG_ERROR, "Failed to rename %s to %s, "
-                        "error: %s", tmppath, shandle->path, strerror (errno));
-                goto out;
-        }
-
-        ret = glusterd_store_sync_direntry (tmppath);
-out:
-        return ret;
-}
-
-int32_t
-glusterd_store_unlink_tmppath (glusterd_store_handle_t *shandle)
-{
-        int32_t         ret = -1;
-        char            tmppath[PATH_MAX] = {0,};
-
-        GF_ASSERT (shandle);
-        GF_ASSERT (shandle->path);
-
-        snprintf (tmppath, sizeof (tmppath), "%s.tmp", shandle->path);
-        ret = unlink (tmppath);
-        if (ret && (errno != ENOENT)) {
-                gf_log (THIS->name, GF_LOG_ERROR, "Failed to mv %s to %s, "
-                        "error: %s", tmppath, shandle->path, strerror (errno));
-        } else {
-                ret = 0;
-        }
-
-        return ret;
-}
-
-static void
-glusterd_replace_slash_with_hipen (char *str)
+void
+glusterd_replace_slash_with_hyphen (char *str)
 {
         char                    *ptr = NULL;
 
@@ -213,7 +71,7 @@ glusterd_store_create_brick_dir (glusterd_volinfo_t *volinfo)
         GF_ASSERT (priv);
 
         GLUSTERD_GET_BRICK_DIR (brickdirpath, volinfo, priv);
-        ret = glusterd_store_mkdir (brickdirpath);
+        ret = gf_store_mkdir (brickdirpath);
 
         return ret;
 }
@@ -227,7 +85,7 @@ glusterd_store_key_vol_brick_set (glusterd_brickinfo_t *brickinfo,
         GF_ASSERT (len >= PATH_MAX);
 
         snprintf (key_vol_brick, len, "%s", brickinfo->path);
-        glusterd_replace_slash_with_hipen (key_vol_brick);
+        glusterd_replace_slash_with_hyphen (key_vol_brick);
 }
 
 static void
@@ -326,7 +184,7 @@ glusterd_store_volinfo_brick_fname_write (int vol_fd,
                   brick_count);
         glusterd_store_brickinfofname_set (brickinfo, brickfname,
                                         sizeof (brickfname));
-        ret = glusterd_store_save_value (vol_fd, key, brickfname);
+        ret = gf_store_save_value (vol_fd, key, brickfname);
         if (ret)
                 goto out;
 
@@ -345,9 +203,9 @@ glusterd_store_create_brick_shandle_on_absence (glusterd_volinfo_t *volinfo,
         GF_ASSERT (brickinfo);
 
         glusterd_store_brickinfopath_set (volinfo, brickinfo, brickpath,
-                                      sizeof (brickpath));
-        ret = glusterd_store_handle_create_on_absence (&brickinfo->shandle,
-                                                       brickpath);
+                                          sizeof (brickpath));
+        ret = gf_store_handle_create_on_absence (&brickinfo->shandle,
+                                                 brickpath);
         return ret;
 }
 
@@ -360,30 +218,48 @@ glusterd_store_brickinfo_write (int fd, glusterd_brickinfo_t *brickinfo)
         GF_ASSERT (brickinfo);
         GF_ASSERT (fd > 0);
 
-        ret = glusterd_store_save_value (fd, GLUSTERD_STORE_KEY_BRICK_HOSTNAME,
-                                         brickinfo->hostname);
+        ret = gf_store_save_value (fd, GLUSTERD_STORE_KEY_BRICK_HOSTNAME,
+                                   brickinfo->hostname);
         if (ret)
                 goto out;
 
-        ret = glusterd_store_save_value (fd, GLUSTERD_STORE_KEY_BRICK_PATH,
-                                         brickinfo->path);
+        ret = gf_store_save_value (fd, GLUSTERD_STORE_KEY_BRICK_PATH,
+                                   brickinfo->path);
         if (ret)
                 goto out;
 
         snprintf (value, sizeof(value), "%d", brickinfo->port);
-        ret = glusterd_store_save_value (fd, GLUSTERD_STORE_KEY_BRICK_PORT,
-                                         value);
+        ret = gf_store_save_value (fd, GLUSTERD_STORE_KEY_BRICK_PORT, value);
 
         snprintf (value, sizeof(value), "%d", brickinfo->rdma_port);
-        ret = glusterd_store_save_value (fd, GLUSTERD_STORE_KEY_BRICK_RDMA_PORT,
-                                         value);
+        ret = gf_store_save_value (fd, GLUSTERD_STORE_KEY_BRICK_RDMA_PORT,
+                                   value);
 
         snprintf (value, sizeof(value), "%d", brickinfo->decommissioned);
-        ret = glusterd_store_save_value (fd, GLUSTERD_STORE_KEY_BRICK_DECOMMISSIONED,
-                                         value);
+        ret = gf_store_save_value (fd, GLUSTERD_STORE_KEY_BRICK_DECOMMISSIONED,
+                                   value);
         if (ret)
                 goto out;
 
+        if (strlen(brickinfo->device_path) > 0) {
+                snprintf (value, sizeof(value), "%s", brickinfo->device_path);
+                ret = gf_store_save_value (fd, GLUSTERD_STORE_KEY_BRICK_DEVICE_PATH,
+                                           value);
+                if (ret)
+                        goto out;
+        }
+
+        snprintf (value, sizeof(value), "%d", brickinfo->snap_status);
+        ret = gf_store_save_value (fd, GLUSTERD_STORE_KEY_BRICK_SNAP_STATUS,
+                                   value);
+        if (ret)
+                goto out;
+
+        if (!brickinfo->vg[0])
+                goto out;
+
+        ret = gf_store_save_value (fd, GLUSTERD_STORE_KEY_BRICK_VGNAME,
+                                         brickinfo->vg);
 out:
         gf_log (THIS->name, GF_LOG_DEBUG, "Returning %d", ret);
         return ret;
@@ -396,7 +272,7 @@ glusterd_store_perform_brick_store (glusterd_brickinfo_t *brickinfo)
         int32_t                     ret = -1;
         GF_ASSERT (brickinfo);
 
-        fd = glusterd_store_mkstemp (brickinfo->shandle);
+        fd = gf_store_mkstemp (brickinfo->shandle);
         if (fd <= 0) {
                 ret = -1;
                 goto out;
@@ -408,7 +284,7 @@ glusterd_store_perform_brick_store (glusterd_brickinfo_t *brickinfo)
 
 out:
         if (ret && (fd > 0))
-                glusterd_store_unlink_tmppath (brickinfo->shandle);
+                gf_store_unlink_tmppath (brickinfo->shandle);
         if (fd > 0)
                 close (fd);
         gf_log (THIS->name, GF_LOG_DEBUG, "Returning %d", ret);
@@ -440,18 +316,17 @@ glusterd_store_brickinfo (glusterd_volinfo_t *volinfo,
                 goto out;
 
         ret = glusterd_store_perform_brick_store (brickinfo);
+
 out:
         gf_log (THIS->name, GF_LOG_DEBUG, "Returning with %d", ret);
         return ret;
 }
 
 int32_t
-glusterd_store_delete_brick (glusterd_volinfo_t *volinfo,
-                             glusterd_brickinfo_t *brickinfo)
+glusterd_store_delete_brick (glusterd_brickinfo_t *brickinfo, char *delete_path)
 {
         int32_t                 ret = -1;
         glusterd_conf_t         *priv = NULL;
-        char                    path[PATH_MAX] = {0,};
         char                    brickpath[PATH_MAX] = {0,};
         char                    *ptr = NULL;
         char                    *tmppath = NULL;
@@ -459,15 +334,11 @@ glusterd_store_delete_brick (glusterd_volinfo_t *volinfo,
 
         this = THIS;
         GF_ASSERT (this);
-        GF_ASSERT (volinfo);
         GF_ASSERT (brickinfo);
 
         priv = this->private;
-
         GF_ASSERT (priv);
 
-        GLUSTERD_GET_BRICK_DIR (path, volinfo, priv);
-
         tmppath = gf_strdup (brickinfo->path);
 
         ptr = strchr (tmppath, '/');
@@ -477,15 +348,16 @@ glusterd_store_delete_brick (glusterd_volinfo_t *volinfo,
                 ptr = strchr (tmppath, '/');
         }
 
-        snprintf (brickpath, sizeof (brickpath), "%s/%s:%s",
-                  path, brickinfo->hostname, tmppath);
+        snprintf (brickpath, sizeof (brickpath),
+                  "%s/"GLUSTERD_BRICK_INFO_DIR"/%s:%s", delete_path,
+                  brickinfo->hostname, tmppath);
 
         GF_FREE (tmppath);
 
         ret = unlink (brickpath);
 
         if ((ret < 0) && (errno != ENOENT)) {
-                gf_log (this->name, GF_LOG_ERROR, "Unlink failed on %s, "
+                gf_log (this->name, GF_LOG_DEBUG, "Unlink failed on %s, "
                         "reason: %s", brickpath, strerror(errno));
                 ret = -1;
                 goto out;
@@ -495,7 +367,7 @@ glusterd_store_delete_brick (glusterd_volinfo_t *volinfo,
 
 out:
         if (brickinfo->shandle) {
-                glusterd_store_handle_destroy (brickinfo->shandle);
+                gf_store_handle_destroy (brickinfo->shandle);
                 brickinfo->shandle = NULL;
         }
         gf_log (this->name, GF_LOG_DEBUG, "Returning with %d", ret);
@@ -503,7 +375,7 @@ out:
 }
 
 int32_t
-glusterd_store_remove_bricks (glusterd_volinfo_t *volinfo)
+glusterd_store_remove_bricks (glusterd_volinfo_t *volinfo, char *delete_path)
 {
         int32_t                 ret = 0;
         glusterd_brickinfo_t    *tmp = NULL;
@@ -520,7 +392,7 @@ glusterd_store_remove_bricks (glusterd_volinfo_t *volinfo)
         GF_ASSERT (volinfo);
 
         list_for_each_entry (tmp, &volinfo->bricks, brick_list) {
-                ret = glusterd_store_delete_brick (volinfo, tmp);
+                ret = glusterd_store_delete_brick (tmp, delete_path);
                 if (ret)
                         goto out;
         }
@@ -528,7 +400,8 @@ glusterd_store_remove_bricks (glusterd_volinfo_t *volinfo)
         priv = this->private;
         GF_ASSERT (priv);
 
-        GLUSTERD_GET_BRICK_DIR (brickdir, volinfo, priv);
+        snprintf (brickdir, sizeof (brickdir), "%s/%s", delete_path,
+                  GLUSTERD_BRICK_INFO_DIR);
 
         dir = opendir (brickdir);
 
@@ -539,7 +412,7 @@ glusterd_store_remove_bricks (glusterd_volinfo_t *volinfo)
                           brickdir, entry->d_name);
                 ret = unlink (path);
                 if (ret && errno != ENOENT) {
-                        gf_log (this->name, GF_LOG_ERROR, "Unable to unlink %s, "
+                        gf_log (this->name, GF_LOG_DEBUG, "Unable to unlink %s, "
                                 "reason: %s", path, strerror(errno));
                 }
                 glusterd_for_each_entry (entry, dir);
@@ -558,13 +431,13 @@ static int
 _storeslaves (dict_t *this, char *key, data_t *value, void *data)
 {
         int32_t                      ret = 0;
-        glusterd_store_handle_t  *shandle = NULL;
-        xlator_t                 *xl = NULL;
+        gf_store_handle_t           *shandle = NULL;
+        xlator_t                    *xl = NULL;
 
         xl = THIS;
         GF_ASSERT (xl);
 
-        shandle = (glusterd_store_handle_t*)data;
+        shandle = (gf_store_handle_t*)data;
 
         GF_ASSERT (shandle);
         GF_ASSERT (shandle->fd > 0);
@@ -583,7 +456,7 @@ _storeslaves (dict_t *this, char *key, data_t *value, void *data)
         gf_log (xl->name, GF_LOG_DEBUG, "Storing in volinfo:key= %s, val=%s",
                 key, value->data);
 
-        ret = glusterd_store_save_value (shandle->fd, key, (char*)value->data);
+        ret = gf_store_save_value (shandle->fd, key, (char*)value->data);
         if (ret) {
                 gf_log (xl->name, GF_LOG_ERROR, "Unable to write into store"
                                 " handle for path: %s", shandle->path);
@@ -597,13 +470,13 @@ int _storeopts (dict_t *this, char *key, data_t *value, void *data)
 {
         int32_t                      ret = 0;
         int32_t                      exists = 0;
-        glusterd_store_handle_t  *shandle = NULL;
-        xlator_t                 *xl = NULL;
+        gf_store_handle_t           *shandle = NULL;
+        xlator_t                    *xl = NULL;
 
         xl = THIS;
         GF_ASSERT (xl);
 
-        shandle = (glusterd_store_handle_t*)data;
+        shandle = (gf_store_handle_t*)data;
 
         GF_ASSERT (shandle);
         GF_ASSERT (shandle->fd > 0);
@@ -636,7 +509,7 @@ int _storeopts (dict_t *this, char *key, data_t *value, void *data)
                 return 0;
         }
 
-        ret = glusterd_store_save_value (shandle->fd, key, (char*)value->data);
+        ret = gf_store_save_value (shandle->fd, key, (char*)value->data);
         if (ret) {
                 gf_log (xl->name, GF_LOG_ERROR, "Unable to write into store"
                         " handle for path: %s", shandle->path);
@@ -648,90 +521,118 @@ int _storeopts (dict_t *this, char *key, data_t *value, void *data)
 int32_t
 glusterd_volume_exclude_options_write (int fd, glusterd_volinfo_t *volinfo)
 {
-        char      *str   = NULL;
+        char    *str            = NULL;
+        char    buf[PATH_MAX]   = {0,};
+        int32_t ret             = -1;
 
         GF_ASSERT (fd > 0);
         GF_ASSERT (volinfo);
 
-        char                    buf[PATH_MAX] = {0,};
-        int32_t                 ret           = -1;
-
         snprintf (buf, sizeof (buf), "%d", volinfo->type);
-        ret = glusterd_store_save_value (fd, GLUSTERD_STORE_KEY_VOL_TYPE, buf);
+        ret = gf_store_save_value (fd, GLUSTERD_STORE_KEY_VOL_TYPE, buf);
         if (ret)
                 goto out;
 
         snprintf (buf, sizeof (buf), "%d", volinfo->brick_count);
-        ret = glusterd_store_save_value (fd, GLUSTERD_STORE_KEY_VOL_COUNT, buf);
+        ret = gf_store_save_value (fd, GLUSTERD_STORE_KEY_VOL_COUNT, buf);
         if (ret)
                 goto out;
 
         snprintf (buf, sizeof (buf), "%d", volinfo->status);
-        ret = glusterd_store_save_value (fd, GLUSTERD_STORE_KEY_VOL_STATUS, buf);
+        ret = gf_store_save_value (fd, GLUSTERD_STORE_KEY_VOL_STATUS, buf);
         if (ret)
                 goto out;
 
         snprintf (buf, sizeof (buf), "%d", volinfo->sub_count);
-        ret = glusterd_store_save_value (fd, GLUSTERD_STORE_KEY_VOL_SUB_COUNT,
-                                         buf);
+        ret = gf_store_save_value (fd, GLUSTERD_STORE_KEY_VOL_SUB_COUNT, buf);
         if (ret)
                 goto out;
 
         snprintf (buf, sizeof (buf), "%d", volinfo->stripe_count);
-        ret = glusterd_store_save_value (fd, GLUSTERD_STORE_KEY_VOL_STRIPE_CNT,
-                                         buf);
+        ret = gf_store_save_value (fd, GLUSTERD_STORE_KEY_VOL_STRIPE_CNT, buf);
         if (ret)
                 goto out;
 
         snprintf (buf, sizeof (buf), "%d", volinfo->replica_count);
-        ret = glusterd_store_save_value (fd, GLUSTERD_STORE_KEY_VOL_REPLICA_CNT,
-                                         buf);
+        ret = gf_store_save_value (fd, GLUSTERD_STORE_KEY_VOL_REPLICA_CNT,
+                                   buf);
         if (ret)
                 goto out;
 
         snprintf (buf, sizeof (buf), "%d", volinfo->version);
-        ret = glusterd_store_save_value (fd, GLUSTERD_STORE_KEY_VOL_VERSION,
-                                         buf);
+        ret = gf_store_save_value (fd, GLUSTERD_STORE_KEY_VOL_VERSION, buf);
         if (ret)
                 goto out;
 
         snprintf (buf, sizeof (buf), "%d", volinfo->transport_type);
-        ret = glusterd_store_save_value (fd, GLUSTERD_STORE_KEY_VOL_TRANSPORT,
-                                         buf);
+        ret = gf_store_save_value (fd, GLUSTERD_STORE_KEY_VOL_TRANSPORT, buf);
         if (ret)
                 goto out;
 
-        ret = glusterd_store_save_value (fd, GLUSTERD_STORE_KEY_VOL_ID,
-                                         uuid_utoa (volinfo->volume_id));
+        snprintf (buf, sizeof (buf), "%s", volinfo->parent_volname);
+        ret = gf_store_save_value (fd, GLUSTERD_STORE_KEY_PARENT_VOLNAME, buf);
+        if (ret) {
+                gf_log (THIS->name, GF_LOG_ERROR, "Failed to store "
+                        GLUSTERD_STORE_KEY_PARENT_VOLNAME);
+                goto out;
+        }
+
+        ret = gf_store_save_value (fd, GLUSTERD_STORE_KEY_VOL_ID,
+                                   uuid_utoa (volinfo->volume_id));
         if (ret)
                 goto out;
 
         str = glusterd_auth_get_username (volinfo);
         if (str) {
-                ret = glusterd_store_save_value (fd,
-                                                 GLUSTERD_STORE_KEY_USERNAME,
-                                                 str);
+                ret = gf_store_save_value (fd, GLUSTERD_STORE_KEY_USERNAME,
+                                           str);
                 if (ret)
                 goto out;
         }
 
         str = glusterd_auth_get_password (volinfo);
         if (str) {
-                ret = glusterd_store_save_value (fd,
-                                                 GLUSTERD_STORE_KEY_PASSWORD,
-                                                 str);
+                ret = gf_store_save_value (fd, GLUSTERD_STORE_KEY_PASSWORD,
+                                           str);
                 if (ret)
                         goto out;
         }
 
-        if (volinfo->backend == GD_VOL_BK_BD)  {
-                snprintf (buf, sizeof (buf), "%d", volinfo->backend);
-                ret = glusterd_store_save_value (fd,
-                        GLUSTERD_STORE_KEY_VOL_BACKEND, buf);
+        snprintf (buf, sizeof (buf), "%d", volinfo->op_version);
+        ret = gf_store_save_value (fd, GLUSTERD_STORE_KEY_VOL_OP_VERSION, buf);
+        if (ret)
+                goto out;
+
+        snprintf (buf, sizeof (buf), "%d", volinfo->client_op_version);
+        ret = gf_store_save_value (fd, GLUSTERD_STORE_KEY_VOL_CLIENT_OP_VERSION,
+                                   buf);
+        if (ret)
+                goto out;
+        if (volinfo->caps) {
+                snprintf (buf, sizeof (buf), "%d", volinfo->caps);
+                ret = gf_store_save_value (fd, GLUSTERD_STORE_KEY_VOL_CAPS,
+                                           buf);
                 if (ret)
                         goto out;
         }
 
+        snprintf (buf, sizeof (buf), "%d", volinfo->is_volume_restored);
+        ret = gf_store_save_value (fd, GLUSTERD_STORE_KEY_VOL_IS_RESTORED, buf);
+        if (ret) {
+                gf_log (THIS->name, GF_LOG_ERROR,
+                        "Unable to write is_volume_restored");
+                goto out;
+        }
+
+        snprintf (buf, sizeof (buf), "%"PRIu64, volinfo->snap_max_hard_limit);
+        ret = gf_store_save_value (fd, GLUSTERD_STORE_KEY_SNAP_MAX_HARD_LIMIT,
+                                   buf);
+        if (ret) {
+                gf_log (THIS->name, GF_LOG_ERROR,
+                        "Unable to write snap-max-hard-limit");
+                goto out;
+        }
+
 out:
         if (ret)
                 gf_log (THIS->name, GF_LOG_ERROR, "Unable to write volume "
@@ -749,8 +650,7 @@ glusterd_store_voldirpath_set (glusterd_volinfo_t *volinfo, char *voldirpath,
         priv = THIS->private;
         GF_ASSERT (priv);
 
-        snprintf (voldirpath, len, "%s/%s/%s", priv->workdir,
-                  GLUSTERD_VOLUME_DIR_PREFIX, volinfo->volname);
+        GLUSTERD_GET_VOLUME_DIR (voldirpath, volinfo, priv);
 }
 
 static int32_t
@@ -763,16 +663,38 @@ glusterd_store_create_volume_dir (glusterd_volinfo_t *volinfo)
 
         glusterd_store_voldirpath_set (volinfo, voldirpath,
                                        sizeof (voldirpath));
-        ret = glusterd_store_mkdir (voldirpath);
+        ret = gf_store_mkdir (voldirpath);
+
         gf_log (THIS->name, GF_LOG_DEBUG, "Returning with %d", ret);
         return ret;
 }
 
+static int32_t
+glusterd_store_create_snap_dir (glusterd_snap_t *snap)
+{
+        int32_t            ret                   = -1;
+        char               snapdirpath[PATH_MAX] = {0,};
+        glusterd_conf_t   *priv                  = NULL;
+
+        priv = THIS->private;
+        GF_ASSERT (priv);
+        GF_ASSERT (snap);
+
+        GLUSTERD_GET_SNAP_DIR (snapdirpath, snap, priv);
+
+        ret = mkdir_p (snapdirpath, 0755, _gf_true);
+        if (ret) {
+                gf_log (THIS->name, GF_LOG_ERROR, "Failed to create snaps dir "
+                        "%s", snapdirpath);
+        }
+        return ret;
+}
+
 int32_t
 glusterd_store_volinfo_write (int fd, glusterd_volinfo_t *volinfo)
 {
         int32_t                         ret = -1;
-        glusterd_store_handle_t         *shandle = NULL;
+        gf_store_handle_t              *shandle = NULL;
         GF_ASSERT (fd > 0);
         GF_ASSERT (volinfo);
         GF_ASSERT (volinfo->shandle);
@@ -792,6 +714,49 @@ out:
         return ret;
 }
 
+int32_t
+glusterd_store_snapinfo_write (glusterd_snap_t *snap)
+{
+        int32_t  ret            = -1;
+        int      fd             = 0;
+        char     buf[PATH_MAX]  = "";
+
+        GF_ASSERT (snap);
+
+        fd = gf_store_mkstemp (snap->shandle);
+        if (fd <= 0)
+               goto out;
+
+        ret = gf_store_save_value (fd, GLUSTERD_STORE_KEY_SNAP_ID,
+                                   uuid_utoa (snap->snap_id));
+        if (ret)
+                goto out;
+
+        snprintf (buf, sizeof (buf), "%d", snap->snap_status);
+        ret = gf_store_save_value (fd, GLUSTERD_STORE_KEY_SNAP_STATUS, buf);
+        if (ret)
+                goto out;
+
+        snprintf (buf, sizeof (buf), "%d", snap->snap_restored);
+        ret = gf_store_save_value (fd, GLUSTERD_STORE_KEY_SNAP_RESTORED, buf);
+        if (ret)
+                goto out;
+
+        if (snap->description) {
+                ret = gf_store_save_value (fd, GLUSTERD_STORE_KEY_SNAP_DESC,
+                                           snap->description);
+                if (ret)
+                        goto out;
+        }
+
+        snprintf (buf, sizeof (buf), "%ld", snap->time_stamp);
+        ret = gf_store_save_value (fd, GLUSTERD_STORE_KEY_SNAP_TIMESTAMP, buf);
+
+out:
+        gf_log (THIS->name, GF_LOG_DEBUG, "Returning %d", ret);
+        return ret;
+}
+
 static void
 glusterd_store_rbstatepath_set (glusterd_volinfo_t *volinfo, char *rbstatepath,
                                 size_t len)
@@ -836,6 +801,37 @@ glusterd_store_node_state_path_set (glusterd_volinfo_t *volinfo,
                   GLUSTERD_NODE_STATE_FILE);
 }
 
+static void
+glusterd_store_missed_snaps_list_path_set (char *missed_snaps_list,
+                                           size_t len)
+{
+        glusterd_conf_t *priv = NULL;
+
+        priv = THIS->private;
+        GF_ASSERT (priv);
+        GF_ASSERT (missed_snaps_list);
+        GF_ASSERT (len <= PATH_MAX);
+
+        snprintf (missed_snaps_list, len, "%s/snaps/"
+                  GLUSTERD_MISSED_SNAPS_LIST_FILE, priv->workdir);
+}
+
+static void
+glusterd_store_snapfpath_set (glusterd_snap_t *snap, char *snap_fpath,
+                              size_t len)
+{
+        glusterd_conf_t *priv = NULL;
+
+        priv = THIS->private;
+        GF_ASSERT (priv);
+        GF_ASSERT (snap);
+        GF_ASSERT (snap_fpath);
+        GF_ASSERT (len <= PATH_MAX);
+
+        snprintf (snap_fpath, len, "%s/snaps/%s/%s", priv->workdir,
+                  snap->snapname, GLUSTERD_SNAP_INFO_FILE);
+}
+
 int32_t
 glusterd_store_create_rbstate_shandle_on_absence (glusterd_volinfo_t *volinfo)
 {
@@ -845,8 +841,8 @@ glusterd_store_create_rbstate_shandle_on_absence (glusterd_volinfo_t *volinfo)
         GF_ASSERT (volinfo);
 
         glusterd_store_rbstatepath_set (volinfo, rbstatepath, sizeof (rbstatepath));
-        ret = glusterd_store_handle_create_on_absence (&volinfo->rb_shandle,
-                                                       rbstatepath);
+        ret = gf_store_handle_create_on_absence (&volinfo->rb_shandle,
+                                                 rbstatepath);
         return ret;
 }
 
@@ -859,8 +855,7 @@ glusterd_store_create_vol_shandle_on_absence (glusterd_volinfo_t *volinfo)
         GF_ASSERT (volinfo);
 
         glusterd_store_volfpath_set (volinfo, volfpath, sizeof (volfpath));
-        ret = glusterd_store_handle_create_on_absence (&volinfo->shandle,
-                                                       volfpath);
+        ret = gf_store_handle_create_on_absence (&volinfo->shandle, volfpath);
         return ret;
 }
 
@@ -875,9 +870,45 @@ glusterd_store_create_nodestate_sh_on_absence (glusterd_volinfo_t *volinfo)
         glusterd_store_node_state_path_set (volinfo, node_state_path,
                                             sizeof (node_state_path));
         ret =
-          glusterd_store_handle_create_on_absence (&volinfo->node_state_shandle,
-                                                   node_state_path);
+          gf_store_handle_create_on_absence (&volinfo->node_state_shandle,
+                                             node_state_path);
+
+        return ret;
+}
+
+static int32_t
+glusterd_store_create_missed_snaps_list_shandle_on_absence ()
+{
+        char               missed_snaps_list[PATH_MAX] = "";
+        int32_t            ret                         = -1;
+        glusterd_conf_t   *priv                        = NULL;
+        xlator_t          *this                        = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+
+        priv = this->private;
+        GF_ASSERT (priv);
+
+        glusterd_store_missed_snaps_list_path_set (missed_snaps_list,
+                                                   sizeof(missed_snaps_list));
 
+        ret = gf_store_handle_create_on_absence
+                                            (&priv->missed_snaps_list_shandle,
+                                             missed_snaps_list);
+        return ret;
+}
+
+int32_t
+glusterd_store_create_snap_shandle_on_absence (glusterd_snap_t *snap)
+{
+        char            snapfpath[PATH_MAX] = {0};
+        int32_t         ret = 0;
+
+        GF_ASSERT (snap);
+
+        glusterd_store_snapfpath_set (snap, snapfpath, sizeof (snapfpath));
+        ret = gf_store_handle_create_on_absence (&snap->shandle, snapfpath);
         return ret;
 }
 
@@ -913,8 +944,7 @@ glusterd_store_rbstate_write (int fd, glusterd_volinfo_t *volinfo)
         GF_ASSERT (volinfo);
 
         snprintf (buf, sizeof (buf), "%d", volinfo->rep_brick.rb_status);
-        ret = glusterd_store_save_value (fd, GLUSTERD_STORE_KEY_RB_STATUS,
-                                         buf);
+        ret = gf_store_save_value (fd, GLUSTERD_STORE_KEY_RB_STATUS, buf);
         if (ret)
                 goto out;
 
@@ -923,16 +953,16 @@ glusterd_store_rbstate_write (int fd, glusterd_volinfo_t *volinfo)
                 snprintf (buf, sizeof (buf), "%s:%s",
                           volinfo->rep_brick.src_brick->hostname,
                           volinfo->rep_brick.src_brick->path);
-                ret = glusterd_store_save_value (fd, GLUSTERD_STORE_KEY_RB_SRC_BRICK,
-                                                 buf);
+                ret = gf_store_save_value (fd, GLUSTERD_STORE_KEY_RB_SRC_BRICK,
+                                           buf);
                 if (ret)
                         goto out;
 
                 snprintf (buf, sizeof (buf), "%s:%s",
                           volinfo->rep_brick.dst_brick->hostname,
                           volinfo->rep_brick.dst_brick->path);
-                ret = glusterd_store_save_value (fd, GLUSTERD_STORE_KEY_RB_DST_BRICK,
-                                                 buf);
+                ret = gf_store_save_value (fd, GLUSTERD_STORE_KEY_RB_DST_BRICK,
+                                           buf);
                 if (ret)
                         goto out;
 
@@ -948,13 +978,12 @@ glusterd_store_rbstate_write (int fd, glusterd_volinfo_t *volinfo)
                 }
 
                 snprintf (buf, sizeof (buf), "%d", port);
-                ret = glusterd_store_save_value (fd, GLUSTERD_STORE_KEY_RB_DST_PORT,
-                                                 buf);
+                ret = gf_store_save_value (fd, GLUSTERD_STORE_KEY_RB_DST_PORT,
+                                           buf);
                 if (ret)
                         goto out;
                 uuid_unparse (volinfo->rep_brick.rb_id, buf);
-                ret = glusterd_store_save_value (fd, GF_REPLACE_BRICK_TID_KEY,
-                                                 buf);
+                ret = gf_store_save_value (fd, GF_REPLACE_BRICK_TID_KEY, buf);
         }
 
         ret = 0;
@@ -970,7 +999,7 @@ glusterd_store_perform_rbstate_store (glusterd_volinfo_t *volinfo)
         int32_t                     ret = -1;
         GF_ASSERT (volinfo);
 
-        fd = glusterd_store_mkstemp (volinfo->rb_shandle);
+        fd = gf_store_mkstemp (volinfo->rb_shandle);
         if (fd <= 0) {
                 ret = -1;
                 goto out;
@@ -980,13 +1009,13 @@ glusterd_store_perform_rbstate_store (glusterd_volinfo_t *volinfo)
         if (ret)
                 goto out;
 
-        ret = glusterd_store_rename_tmppath (volinfo->rb_shandle);
+        ret = gf_store_rename_tmppath (volinfo->rb_shandle);
         if (ret)
                 goto out;
 
 out:
         if (ret && (fd > 0))
-                glusterd_store_unlink_tmppath (volinfo->rb_shandle);
+                gf_store_unlink_tmppath (volinfo->rb_shandle);
         if (fd > 0)
                 close (fd);
         gf_log (THIS->name, GF_LOG_DEBUG, "Returning %d", ret);
@@ -1008,22 +1037,18 @@ glusterd_store_node_state_write (int fd, glusterd_volinfo_t *volinfo)
         }
 
         snprintf (buf, sizeof (buf), "%d", volinfo->rebal.defrag_cmd);
-        ret = glusterd_store_save_value (fd, GLUSTERD_STORE_KEY_VOL_DEFRAG,
-                                         buf);
+        ret = gf_store_save_value (fd, GLUSTERD_STORE_KEY_VOL_DEFRAG, buf);
         if (ret)
                 goto out;
 
         snprintf (buf, sizeof (buf), "%d", volinfo->rebal.op);
-        ret = glusterd_store_save_value (fd, GLUSTERD_STORE_KEY_DEFRAG_OP,
-                                         buf);
+        ret = gf_store_save_value (fd, GLUSTERD_STORE_KEY_DEFRAG_OP, buf);
         if (ret)
                 goto out;
 
         if (volinfo->rebal.defrag_cmd) {
                 uuid_unparse (volinfo->rebal.rebalance_id, buf);
-                ret = glusterd_store_save_value (fd,
-                                                 GF_REBALANCE_TID_KEY,
-                                                 buf);
+                ret = gf_store_save_value (fd, GF_REBALANCE_TID_KEY, buf);
         }
 out:
         gf_log (THIS->name, GF_LOG_DEBUG, "Returning %d", ret);
@@ -1037,7 +1062,7 @@ glusterd_store_perform_node_state_store (glusterd_volinfo_t *volinfo)
         int32_t                     ret = -1;
         GF_ASSERT (volinfo);
 
-        fd = glusterd_store_mkstemp (volinfo->node_state_shandle);
+        fd = gf_store_mkstemp (volinfo->node_state_shandle);
         if (fd <= 0) {
                 ret = -1;
                 goto out;
@@ -1047,13 +1072,13 @@ glusterd_store_perform_node_state_store (glusterd_volinfo_t *volinfo)
         if (ret)
                 goto out;
 
-        ret = glusterd_store_rename_tmppath (volinfo->node_state_shandle);
+        ret = gf_store_rename_tmppath (volinfo->node_state_shandle);
         if (ret)
                 goto out;
 
 out:
         if (ret && (fd > 0))
-                glusterd_store_unlink_tmppath (volinfo->node_state_shandle);
+                gf_store_unlink_tmppath (volinfo->node_state_shandle);
         if (fd > 0)
                 close (fd);
         gf_log (THIS->name, GF_LOG_DEBUG, "Returning %d", ret);
@@ -1067,7 +1092,7 @@ glusterd_store_perform_volume_store (glusterd_volinfo_t *volinfo)
         int32_t                     ret = -1;
         GF_ASSERT (volinfo);
 
-        fd = glusterd_store_mkstemp (volinfo->shandle);
+        fd = gf_store_mkstemp (volinfo->shandle);
         if (fd <= 0) {
                 ret = -1;
                 goto out;
@@ -1083,7 +1108,7 @@ glusterd_store_perform_volume_store (glusterd_volinfo_t *volinfo)
 
 out:
         if (ret && (fd > 0))
-                glusterd_store_unlink_tmppath (volinfo->shandle);
+                gf_store_unlink_tmppath (volinfo->shandle);
         if (fd > 0)
                 close (fd);
         gf_log (THIS->name, GF_LOG_DEBUG, "Returning %d", ret);
@@ -1116,7 +1141,7 @@ glusterd_store_bricks_cleanup_tmp (glusterd_volinfo_t *volinfo)
         GF_ASSERT (volinfo);
 
         list_for_each_entry (brickinfo, &volinfo->bricks, brick_list) {
-                glusterd_store_unlink_tmppath (brickinfo->shandle);
+                gf_store_unlink_tmppath (brickinfo->shandle);
         }
 }
 
@@ -1127,11 +1152,19 @@ glusterd_store_volume_cleanup_tmp (glusterd_volinfo_t *volinfo)
 
         glusterd_store_bricks_cleanup_tmp (volinfo);
 
-        glusterd_store_unlink_tmppath (volinfo->shandle);
+        gf_store_unlink_tmppath (volinfo->shandle);
 
-        glusterd_store_unlink_tmppath (volinfo->rb_shandle);
+        gf_store_unlink_tmppath (volinfo->rb_shandle);
 
-        glusterd_store_unlink_tmppath (volinfo->node_state_shandle);
+        gf_store_unlink_tmppath (volinfo->node_state_shandle);
+}
+
+void
+glusterd_store_snap_cleanup_tmp (glusterd_snap_t *snap)
+{
+        GF_ASSERT (snap);
+
+        gf_store_unlink_tmppath (snap->shandle);
 }
 
 int32_t
@@ -1143,7 +1176,7 @@ glusterd_store_brickinfos_atomic_update (glusterd_volinfo_t *volinfo)
         GF_ASSERT (volinfo);
 
         list_for_each_entry (brickinfo, &volinfo->bricks, brick_list) {
-                ret = glusterd_store_rename_tmppath (brickinfo->shandle);
+                ret = gf_store_rename_tmppath (brickinfo->shandle);
                 if (ret)
                         goto out;
         }
@@ -1157,7 +1190,7 @@ glusterd_store_volinfo_atomic_update (glusterd_volinfo_t *volinfo)
         int ret = -1;
         GF_ASSERT (volinfo);
 
-        ret = glusterd_store_rename_tmppath (volinfo->shandle);
+        ret = gf_store_rename_tmppath (volinfo->shandle);
         if (ret)
                 goto out;
 
@@ -1185,6 +1218,60 @@ out:
 }
 
 int32_t
+glusterd_store_snap_atomic_update (glusterd_snap_t *snap)
+{
+        int ret = -1;
+        GF_ASSERT (snap);
+
+        ret = gf_store_rename_tmppath (snap->shandle);
+        if (ret)
+                gf_log (THIS->name, GF_LOG_ERROR, "Couldn't rename "
+                        "temporary file(s): Reason %s", strerror (errno));
+
+        return ret;
+}
+
+int32_t
+glusterd_store_snap (glusterd_snap_t *snap)
+{
+        int32_t                 ret = -1;
+
+        GF_ASSERT (snap);
+
+        ret = glusterd_store_create_snap_dir (snap);
+        if (ret) {
+                gf_log (THIS->name, GF_LOG_ERROR, "Failed to create snap dir");
+                goto out;
+        }
+
+        ret = glusterd_store_create_snap_shandle_on_absence (snap);
+        if (ret) {
+                gf_log (THIS->name, GF_LOG_ERROR, "Failed to create snap info "
+                        "file");
+                goto out;
+        }
+
+        ret = glusterd_store_snapinfo_write (snap);
+        if (ret) {
+                gf_log (THIS->name, GF_LOG_ERROR, "Failed to write snap info");
+                goto out;
+        }
+
+        ret = glusterd_store_snap_atomic_update (snap);
+        if (ret) {
+                gf_log (THIS->name, GF_LOG_ERROR,"Failed to do automic update");
+                goto out;
+        }
+
+out:
+        if (ret)
+                glusterd_store_snap_cleanup_tmp (snap);
+
+        gf_log (THIS->name, GF_LOG_TRACE, "Returning %d", ret);
+        return ret;
+}
+
+int32_t
 glusterd_store_volinfo (glusterd_volinfo_t *volinfo, glusterd_volinfo_ver_ac_t ac)
 {
         int32_t                 ret = -1;
@@ -1241,18 +1328,20 @@ out:
         return ret;
 }
 
-
 int32_t
 glusterd_store_delete_volume (glusterd_volinfo_t *volinfo)
 {
-        char    pathname[PATH_MAX] = {0,};
-        int32_t ret = 0;
-        glusterd_conf_t *priv = NULL;
-        DIR     *dir = NULL;
-        struct dirent *entry = NULL;
-        char path[PATH_MAX] = {0,};
-        struct stat     st = {0, };
-        xlator_t        *this = NULL;
+        char             pathname[PATH_MAX]    = {0,};
+        int32_t          ret                   = 0;
+        glusterd_conf_t *priv                  = NULL;
+        DIR             *dir                   = NULL;
+        struct dirent   *entry                 = NULL;
+        char             path[PATH_MAX]        = {0,};
+        char             delete_path[PATH_MAX] = {0,};
+        char             trashdir[PATH_MAX]    = {0,};
+        struct stat      st                    = {0, };
+        xlator_t        *this                  = NULL;
+        gf_boolean_t     rename_fail           = _gf_false;
 
         this = THIS;
         GF_ASSERT (this);
@@ -1261,29 +1350,53 @@ glusterd_store_delete_volume (glusterd_volinfo_t *volinfo)
         priv = this->private;
 
         GF_ASSERT (priv);
-        snprintf (pathname, sizeof (pathname), "%s/vols/%s", priv->workdir,
-                  volinfo->volname);
 
-        dir = opendir (pathname);
+        GLUSTERD_GET_VOLUME_DIR (pathname, volinfo, priv);
+
+        snprintf (delete_path, sizeof (delete_path),
+        "%s/"GLUSTERD_TRASH"/%s.deleted", priv->workdir,
+        uuid_utoa (volinfo->volume_id));
+
+        snprintf (trashdir, sizeof (trashdir), "%s/"GLUSTERD_TRASH,
+                  priv->workdir);
+
+        ret = mkdir (trashdir, 0777);
+        if (ret && errno != EEXIST) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to create trash "
+                        "directory, reason : %s", strerror (errno));
+                ret = -1;
+                goto out;
+        }
+
+        ret = rename (pathname, delete_path);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to rename volume "
+                        "directory for volume %s", volinfo->volname);
+                rename_fail = _gf_true;
+                goto out;
+        }
+
+        dir = opendir (delete_path);
         if (!dir) {
-                gf_log (this->name, GF_LOG_ERROR, "Failed to open directory %s."
-                        " Reason : %s", pathname, strerror (errno));
+                gf_log (this->name, GF_LOG_DEBUG, "Failed to open directory %s."
+                        " Reason : %s", delete_path, strerror (errno));
+                ret = 0;
                 goto out;
         }
-        ret = glusterd_store_remove_bricks (volinfo);
+        ret = glusterd_store_remove_bricks (volinfo, delete_path);
 
         if (ret) {
-                gf_log (this->name, GF_LOG_ERROR, "Remove bricks failed for %s",
+                gf_log (this->name, GF_LOG_DEBUG, "Remove bricks failed for %s",
                         volinfo->volname);
         }
 
         glusterd_for_each_entry (entry, dir);
         while (entry) {
 
-                snprintf (path, PATH_MAX, "%s/%s", pathname, entry->d_name);
+                snprintf (path, PATH_MAX, "%s/%s", delete_path, entry->d_name);
                 ret = stat (path, &st);
                 if (ret == -1) {
-                        gf_log (this->name, GF_LOG_ERROR, "Failed to stat "
+                        gf_log (this->name, GF_LOG_DEBUG, "Failed to stat "
                                 "entry %s : %s", path, strerror (errno));
                         goto stat_failed;
                 }
@@ -1293,11 +1406,12 @@ glusterd_store_delete_volume (glusterd_volinfo_t *volinfo)
                 else
                         ret = unlink (path);
 
-                if (ret)
-                        gf_log (this->name, GF_LOG_ERROR, " Failed to remove "
+                if (ret) {
+                        gf_log (this->name, GF_LOG_DEBUG, " Failed to remove "
                                 "%s. Reason : %s", path, strerror (errno));
+                }
 
-                gf_log (this->name, ret ? GF_LOG_ERROR : GF_LOG_DEBUG, "%s %s",
+                gf_log (this->name, GF_LOG_DEBUG, "%s %s",
                                 ret ? "Failed to remove":"Removed",
                                 entry->d_name);
 stat_failed:
@@ -1307,290 +1421,153 @@ stat_failed:
 
         ret = closedir (dir);
         if (ret) {
-                gf_log (this->name, GF_LOG_ERROR, "Failed to close dir %s. "
-                        "Reason : %s",pathname, strerror (errno));
+                gf_log (this->name, GF_LOG_DEBUG, "Failed to close dir %s. "
+                        "Reason : %s",delete_path, strerror (errno));
         }
 
-        ret = rmdir (pathname);
+        ret = rmdir (delete_path);
         if (ret) {
-                gf_log (this->name, GF_LOG_ERROR, "Failed to rmdir: %s, err: %s",
-                        pathname, strerror (errno));
+                gf_log (this->name, GF_LOG_DEBUG, "Failed to rmdir: %s,err: %s",
+                        delete_path, strerror (errno));
+        }
+        ret = rmdir (trashdir);
+        if (ret) {
+                gf_log (this->name, GF_LOG_DEBUG, "Failed to rmdir: %s, Reason:"
+                        " %s", trashdir, strerror (errno));
         }
-
 
 out:
         if (volinfo->shandle) {
-                glusterd_store_handle_destroy (volinfo->shandle);
+                gf_store_handle_destroy (volinfo->shandle);
                 volinfo->shandle = NULL;
         }
-        gf_log (this->name, GF_LOG_DEBUG, "Returning %d", ret);
+        ret = (rename_fail == _gf_true) ? -1: 0;
 
+        gf_log (this->name, GF_LOG_DEBUG, "Returning %d", ret);
         return ret;
 }
 
+/*TODO: cleanup the duplicate code and implement a generic function for
+ * deleting snap/volume depending on the parameter flag */
+int32_t
+glusterd_store_delete_snap (glusterd_snap_t *snap)
+{
+        char             pathname[PATH_MAX]    = {0,};
+        int32_t          ret                   = 0;
+        glusterd_conf_t *priv                  = NULL;
+        DIR             *dir                   = NULL;
+        struct dirent   *entry                 = NULL;
+        char             path[PATH_MAX]        = {0,};
+        char             delete_path[PATH_MAX] = {0,};
+        char             trashdir[PATH_MAX]    = {0,};
+        struct stat      st                    = {0, };
+        xlator_t        *this                  = NULL;
+        gf_boolean_t     rename_fail           = _gf_false;
 
-int
-glusterd_store_read_and_tokenize (FILE *file, char *str,
-                                  char **iter_key, char **iter_val,
-                                  glusterd_store_op_errno_t *store_errno)
-{
-        int32_t  ret = -1;
-        char *savetok = NULL;
+        this = THIS;
+        priv = this->private;
+        GF_ASSERT (priv);
 
-        GF_ASSERT (file);
-        GF_ASSERT (str);
-        GF_ASSERT (iter_key);
-        GF_ASSERT (iter_val);
-        GF_ASSERT (store_errno);
+        GF_ASSERT (snap);
+        GLUSTERD_GET_SNAP_DIR (pathname, snap, priv);
 
-        ret = fscanf (file, "%s", str);
-        if (ret <= 0 || feof (file)) {
-                ret = -1;
-                *store_errno = GD_STORE_EOF;
-                goto out;
-        }
+        snprintf (delete_path, sizeof (delete_path),
+        "%s/"GLUSTERD_TRASH"/snap-%s.deleted", priv->workdir,
+        uuid_utoa (snap->snap_id));
 
-        *iter_key = strtok_r (str, "=", &savetok);
-        if (*iter_key == NULL) {
-                ret = -1;
-                *store_errno = GD_STORE_KEY_NULL;
-                goto out;
-        }
+        snprintf (trashdir, sizeof (trashdir), "%s/"GLUSTERD_TRASH,
+                  priv->workdir);
 
-        *iter_val = strtok_r (NULL, "=", &savetok);
-        if (*iter_key == NULL) {
+        ret = mkdir (trashdir, 0777);
+        if (ret && errno != EEXIST) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to create trash "
+                        "directory, reason : %s", strerror (errno));
                 ret = -1;
-                *store_errno = GD_STORE_VALUE_NULL;
-                goto out;
-        }
-
-        *store_errno = GD_STORE_SUCCESS;
-        ret = 0;
-out:
-        return ret;
-}
-
-int32_t
-glusterd_store_retrieve_value (glusterd_store_handle_t *handle,
-                               char *key, char **value)
-{
-        int32_t         ret = -1;
-        char            *scan_str = NULL;
-        char            *iter_key = NULL;
-        char            *iter_val = NULL;
-        char            *free_str = NULL;
-        struct stat     st        = {0,};
-        glusterd_store_op_errno_t store_errno = GD_STORE_SUCCESS;
-
-        GF_ASSERT (handle);
-
-        handle->fd = open (handle->path, O_RDWR);
-
-        if (handle->fd == -1) {
-                gf_log ("", GF_LOG_ERROR, "Unable to open file %s errno: %s",
-                        handle->path, strerror (errno));
-                goto out;
-        }
-        if (!handle->read)
-                handle->read = fdopen (handle->fd, "r");
-
-        if (!handle->read) {
-                gf_log ("", GF_LOG_ERROR, "Unable to open file %s errno: %s",
-                        handle->path, strerror (errno));
                 goto out;
         }
 
-        ret = fstat (handle->fd, &st);
-        if (ret < 0) {
-                gf_log ("glusterd", GF_LOG_WARNING,
-                        "stat on file failed");
-                ret = -1;
-                store_errno = GD_STORE_STAT_FAILED;
+        ret = rename (pathname, delete_path);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to rename snap "
+                        "directory %s to %s", snap->snapname, delete_path);
+                rename_fail = _gf_true;
                 goto out;
         }
 
-        scan_str = GF_CALLOC (1, st.st_size,
-                              gf_gld_mt_char);
-        if (scan_str == NULL) {
-                ret = -1;
-                store_errno = GD_STORE_ENOMEM;
+        dir = opendir (delete_path);
+        if (!dir) {
+                gf_log (this->name, GF_LOG_DEBUG, "Failed to open directory %s."
+                        " Reason : %s", delete_path, strerror (errno));
+                ret = 0;
                 goto out;
         }
 
-        free_str = scan_str;
-
-        do {
-                ret = glusterd_store_read_and_tokenize (handle->read, scan_str,
-                                                        &iter_key, &iter_val,
-                                                        &store_errno);
-                if (ret < 0) {
-                        goto out;
+        glusterd_for_each_entry (entry, dir);
+        while (entry) {
+                snprintf (path, PATH_MAX, "%s/%s", delete_path, entry->d_name);
+                ret = stat (path, &st);
+                if (ret == -1) {
+                        gf_log (this->name, GF_LOG_DEBUG, "Failed to stat "
+                                "entry %s : %s", path, strerror (errno));
+                        goto stat_failed;
                 }
 
-                gf_log ("", GF_LOG_DEBUG, "key %s read", iter_key);
+                if (S_ISDIR (st.st_mode))
+                        ret = rmdir (path);
+                else
+                        ret = unlink (path);
 
-                if (!strcmp (key, iter_key)) {
-                        gf_log ("", GF_LOG_DEBUG, "key %s found", key);
-                        ret = 0;
-                        if (iter_val)
-                                *value = gf_strdup (iter_val);
-                        goto out;
+                if (ret) {
+                        gf_log (this->name, GF_LOG_DEBUG, " Failed to remove "
+                                "%s. Reason : %s", path, strerror (errno));
                 }
-        } while (1);
-out:
-        if (handle->fd > 0) {
-                close (handle->fd);
-                handle->read = NULL;
-        }
-
-        GF_FREE (free_str);
-
-        return ret;
-}
 
-int32_t
-glusterd_store_save_value (int fd, char *key, char *value)
-{
-        int32_t         ret = -1;
-        FILE           *fp  = NULL;
-        xlator_t       *this = NULL;
-
-        this = THIS;
-        GF_ASSERT (this);
-        GF_ASSERT (fd > 0);
-        GF_ASSERT (key);
-        GF_ASSERT (value);
-
-        fp = fdopen (fd, "a+");
-        if (fp == NULL) {
-                gf_log (this->name, GF_LOG_WARNING, "fdopen failed.");
-                ret = -1;
-                goto out;
+                gf_log (this->name, GF_LOG_DEBUG, "%s %s",
+                                ret ? "Failed to remove":"Removed",
+                                entry->d_name);
+stat_failed:
+                memset (path, 0, sizeof(path));
+                glusterd_for_each_entry (entry, dir);
         }
 
-        ret = fprintf (fp, "%s=%s\n", key, value);
-        if (ret < 0) {
-                gf_log (this->name, GF_LOG_WARNING, "Unable to store key: %s,"
-                        "value: %s, error: %s", key, value,
-                        strerror (errno));
-                ret = -1;
-                goto out;
+        ret = closedir (dir);
+        if (ret) {
+                gf_log (this->name, GF_LOG_DEBUG, "Failed to close dir %s. "
+                        "Reason : %s",delete_path, strerror (errno));
         }
 
-        ret = fflush (fp);
-        if (feof (fp)) {
-                gf_log (this->name, GF_LOG_WARNING,
-                        "fflush failed, error: %s",
-                        strerror (errno));
-                ret = -1;
-                goto out;
+        ret = rmdir (delete_path);
+        if (ret) {
+                gf_log (this->name, GF_LOG_DEBUG, "Failed to rmdir: %s,err: %s",
+                        delete_path, strerror (errno));
         }
-
-        ret = 0;
-out:
-
-        gf_log (this->name, GF_LOG_DEBUG, "returning: %d", ret);
-        return ret;
-}
-
-int32_t
-glusterd_store_handle_new (char *path, glusterd_store_handle_t **handle)
-{
-        int32_t                 ret = -1;
-        glusterd_store_handle_t *shandle = NULL;
-        int                     fd = -1;
-        char                    *spath = NULL;
-        xlator_t                *this = NULL;
-
-        this = THIS;
-        GF_ASSERT (this);
-
-        shandle = GF_CALLOC (1, sizeof (*shandle), gf_gld_mt_store_handle_t);
-        if (!shandle)
-                goto out;
-
-        spath = gf_strdup (path);
-
-        if (!spath)
-                goto out;
-
-        fd = open (path, O_RDWR | O_CREAT | O_APPEND, 0600);
-        if (fd <= 0) {
-                gf_log (this->name, GF_LOG_ERROR, "Failed to open file: %s, "
-                        "error: %s", path, strerror (errno));
-                goto out;
+        ret = rmdir (trashdir);
+        if (ret) {
+                gf_log (this->name, GF_LOG_DEBUG, "Failed to rmdir: %s, Reason:"
+                        " %s", trashdir, strerror (errno));
         }
 
-        ret = glusterd_store_sync_direntry (spath);
-        if (ret)
-                goto out;
-
-        shandle->path = spath;
-        *handle = shandle;
-
-        ret = 0;
 out:
-        if (fd > 0)
-                close (fd);
-
-        if (ret == -1) {
-                GF_FREE (spath);
-                GF_FREE (shandle);
+        if (snap->shandle) {
+                gf_store_handle_destroy (snap->shandle);
+                snap->shandle = NULL;
         }
+        ret = (rename_fail == _gf_true) ? -1: 0;
 
         gf_log (this->name, GF_LOG_DEBUG, "Returning %d", ret);
         return ret;
 }
 
 int
-glusterd_store_handle_retrieve (char *path, glusterd_store_handle_t **handle)
-{
-        int32_t                 ret = -1;
-        struct stat statbuf = {0};
-
-        ret = stat (path, &statbuf);
-        if (ret) {
-                gf_log ("glusterd", GF_LOG_ERROR, "Unable to retrieve store "
-                        "handle for %s, error: %s", path, strerror (errno));
-                goto out;
-        }
-        ret =  glusterd_store_handle_new (path, handle);
-out:
-        gf_log ("", GF_LOG_DEBUG, "Returning %d", ret);
-        return ret;
-}
-
-int32_t
-glusterd_store_handle_destroy (glusterd_store_handle_t *handle)
-{
-        int32_t                 ret = -1;
-
-        if (!handle) {
-                ret = 0;
-                goto out;
-        }
-
-        GF_FREE (handle->path);
-
-        GF_FREE (handle);
-
-        ret = 0;
-
-out:
-        gf_log (THIS->name, GF_LOG_DEBUG, "Returning %d", ret);
-
-        return ret;
-}
-
-int
 glusterd_store_global_info (xlator_t *this)
 {
         int                     ret                     = -1;
         glusterd_conf_t         *conf                   = NULL;
         char                    op_version_str[15]      = {0,};
         char                    path[PATH_MAX]          = {0,};
-        glusterd_store_handle_t *handle                 = NULL;
+        gf_store_handle_t       *handle                 = NULL;
         char                    *uuid_str               = NULL;
+        char                     buf[256]               = {0, };
 
         conf = this->private;
 
@@ -1601,7 +1578,7 @@ glusterd_store_global_info (xlator_t *this)
         if (!conf->handle) {
                 snprintf (path, PATH_MAX, "%s/%s", conf->workdir,
                           GLUSTERD_INFO_FILE);
-                ret = glusterd_store_handle_new (path, &handle);
+                ret = gf_store_handle_new (path, &handle);
                 if (ret) {
                         gf_log (this->name, GF_LOG_ERROR,
                                 "Unable to get store handle");
@@ -1620,14 +1597,14 @@ glusterd_store_global_info (xlator_t *this)
                 goto out;
         }
 
-        handle->fd = glusterd_store_mkstemp (handle);
+        handle->fd = gf_store_mkstemp (handle);
         if (handle->fd <= 0) {
                 ret = -1;
                 goto out;
         }
 
-        ret = glusterd_store_save_value (handle->fd, GLUSTERD_STORE_UUID_KEY,
-                                         uuid_str);
+        ret = gf_store_save_value (handle->fd, GLUSTERD_STORE_UUID_KEY,
+                                   uuid_str);
         if (ret) {
                 gf_log (this->name, GF_LOG_CRITICAL,
                         "Storing uuid failed ret = %d", ret);
@@ -1635,18 +1612,36 @@ glusterd_store_global_info (xlator_t *this)
         }
 
         snprintf (op_version_str, 15, "%d", conf->op_version);
-        ret = glusterd_store_save_value (handle->fd, GD_OP_VERSION_KEY,
-                                         op_version_str);
+        ret = gf_store_save_value (handle->fd, GD_OP_VERSION_KEY,
+                                   op_version_str);
         if (ret) {
                 gf_log (this->name, GF_LOG_ERROR,
                         "Storing op-version failed ret = %d", ret);
                 goto out;
         }
 
-        ret = glusterd_store_rename_tmppath (handle);
+        snprintf (buf, sizeof (buf), "%"PRIu64, conf->snap_max_hard_limit);
+        ret = gf_store_save_value (handle->fd,
+                                   GLUSTERD_STORE_KEY_SNAP_MAX_HARD_LIMIT, buf);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Storing snap-max-hard-limit failed ret = %d", ret);
+                goto out;
+        }
+
+        snprintf (buf, sizeof (buf), "%"PRIu64, conf->snap_max_soft_limit);
+        ret = gf_store_save_value (handle->fd,
+                                   GLUSTERD_STORE_KEY_SNAP_MAX_SOFT_LIMIT, buf);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Storing snap-max-soft-limit failed ret = %d", ret);
+                goto out;
+        }
+
+        ret = gf_store_rename_tmppath (handle);
 out:
         if (ret && (handle->fd > 0))
-                glusterd_store_unlink_tmppath (handle);
+                gf_store_unlink_tmppath (handle);
 
         if (handle->fd > 0) {
                 close (handle->fd);
@@ -1672,17 +1667,17 @@ glusterd_retrieve_op_version (xlator_t *this, int *op_version)
         int                     tmp_version     = 0;
         char                    *tmp            = NULL;
         char                    path[PATH_MAX]  = {0,};
-        glusterd_store_handle_t *handle         = NULL;
+        gf_store_handle_t       *handle         = NULL;
 
         priv = this->private;
 
         if (!priv->handle) {
                 snprintf (path, PATH_MAX, "%s/%s", priv->workdir,
                           GLUSTERD_INFO_FILE);
-                ret = glusterd_store_handle_retrieve (path, &handle);
+                ret = gf_store_handle_retrieve (path, &handle);
 
                 if (ret) {
-                        gf_log ("", GF_LOG_ERROR, "Unable to get store "
+                        gf_log ("", GF_LOG_DEBUG, "Unable to get store "
                                 "handle!");
                         goto out;
                 }
@@ -1690,9 +1685,8 @@ glusterd_retrieve_op_version (xlator_t *this, int *op_version)
                 priv->handle = handle;
         }
 
-        ret = glusterd_store_retrieve_value (priv->handle,
-                                             GD_OP_VERSION_KEY,
-                                             &op_version_str);
+        ret = gf_store_retrieve_value (priv->handle, GD_OP_VERSION_KEY,
+                                       &op_version_str);
         if (ret) {
                 gf_log (this->name, GF_LOG_DEBUG,
                         "No previous op_version present");
@@ -1715,21 +1709,100 @@ out:
         return ret;
 }
 
+int
+glusterd_retrieve_sys_snap_max_limit (xlator_t *this, uint64_t *limit,
+                                      char *key)
+{
+        char                    *limit_str      = NULL;
+        glusterd_conf_t         *priv           = NULL;
+        int                     ret             = -1;
+        uint64_t                tmp_limit       = 0;
+        char                    *tmp            = NULL;
+        char                    path[PATH_MAX]  = {0,};
+        gf_store_handle_t       *handle         = NULL;
+
+        GF_ASSERT (this);
+        priv = this->private;
+
+        GF_ASSERT (priv);
+        GF_ASSERT (limit);
+        GF_ASSERT (key);
+
+        if (!priv->handle) {
+                snprintf (path, PATH_MAX, "%s/%s", priv->workdir,
+                          GLUSTERD_INFO_FILE);
+                ret = gf_store_handle_retrieve (path, &handle);
+
+                if (ret) {
+                        gf_log ("", GF_LOG_DEBUG, "Unable to get store "
+                                "handle!");
+                        goto out;
+                }
+
+                priv->handle = handle;
+        }
+
+        ret = gf_store_retrieve_value (priv->handle,
+                                       key,
+                                       &limit_str);
+        if (ret) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "No previous %s present", key);
+                goto out;
+        }
+
+        tmp_limit = strtoul (limit_str, &tmp, 10);
+        if ((tmp_limit <= 0) || (tmp && strlen (tmp) > 1)) {
+                gf_log (this->name, GF_LOG_WARNING, "invalid version number");
+                goto out;
+        }
+
+        *limit = tmp_limit;
+
+        ret = 0;
+out:
+        if (limit_str)
+                GF_FREE (limit_str);
+
+        return ret;
+}
 static int
 glusterd_restore_op_version (xlator_t *this)
 {
-        glusterd_conf_t *conf = NULL;
-        int ret = 0;
-        int op_version = 0;
+        glusterd_conf_t *conf           = NULL;
+        int              ret            = 0;
+        int              op_version     = 0;
 
         conf = this->private;
 
+        ret = glusterd_retrieve_sys_snap_max_limit (this,
+                                                    &conf->snap_max_hard_limit,
+                                                    GLUSTERD_STORE_KEY_SNAP_MAX_HARD_LIMIT);
+        if (ret) {
+                gf_log (this->name, GF_LOG_WARNING,
+                        "Unable to retrieve system snap-max-hard-limit, "
+                        "setting it to default value(%d)",
+                        GLUSTERD_SNAPS_MAX_HARD_LIMIT);
+                conf->snap_max_hard_limit = GLUSTERD_SNAPS_MAX_HARD_LIMIT;
+        }
+
+        ret = glusterd_retrieve_sys_snap_max_limit (this,
+                                                    &conf->snap_max_soft_limit,
+                                                    GLUSTERD_STORE_KEY_SNAP_MAX_SOFT_LIMIT);
+        if (ret) {
+                gf_log (this->name, GF_LOG_WARNING,
+                        "Unable to retrieve system snap-max-soft-limit, "
+                        "setting it to default value(%d)",
+                        GLUSTERD_SNAPS_DEF_SOFT_LIMIT_PERCENT);
+                conf->snap_max_soft_limit = GLUSTERD_SNAPS_DEF_SOFT_LIMIT_PERCENT;
+        }
+
         ret = glusterd_retrieve_op_version (this, &op_version);
         if (!ret) {
                 if ((op_version < GD_OP_VERSION_MIN) ||
                     (op_version > GD_OP_VERSION_MAX)) {
                         gf_log (this->name, GF_LOG_ERROR,
-                                "wrong op-version (%d) retreived", op_version);
+                                "wrong op-version (%d) retrieved", op_version);
                         ret = -1;
                         goto out;
                 }
@@ -1739,11 +1812,29 @@ glusterd_restore_op_version (xlator_t *this)
                 goto out;
         }
 
-        gf_log (this->name, GF_LOG_INFO, "op-version not found in store, "
-                "setting it to minimum op-version : %d", GD_OP_VERSION_MIN);
-
-        /* If op-version is missing, set it to  GD_OP_VERSION_MIN */
-        conf->op_version = GD_OP_VERSION_MIN;
+        /* op-version can be missing from the store file in 2 cases,
+         * 1. This is a new install of glusterfs
+         * 2. This is an upgrade of glusterfs from a version without op-version
+         *    to a version with op-version (eg. 3.3 -> 3.4)
+         *
+         * Detection of a new install or an upgrade from an older install can be
+         * done by checking for the presence of the its peer-id in the store
+         * file.  If peer-id is present, the installation is an upgrade else, it
+         * is a new install.
+         *
+         * For case 1, set op-version to GD_OP_VERSION_MAX.
+         * For case 2, set op-version to GD_OP_VERSION_MIN.
+         */
+        ret = glusterd_retrieve_uuid();
+        if (ret) {
+                gf_log (this->name, GF_LOG_INFO, "Detected new install. Setting"
+                        " op-version to maximum : %d", GD_OP_VERSION_MAX);
+                conf->op_version = GD_OP_VERSION_MAX;
+        } else {
+                gf_log (this->name, GF_LOG_INFO, "Upgrade detected. Setting"
+                        " op-version to minimum : %d", GD_OP_VERSION_MIN);
+                conf->op_version = GD_OP_VERSION_MIN;
+        }
         ret = 0;
 out:
         return ret;
@@ -1754,7 +1845,7 @@ glusterd_retrieve_uuid ()
 {
         char            *uuid_str = NULL;
         int32_t         ret = -1;
-        glusterd_store_handle_t *handle = NULL;
+        gf_store_handle_t *handle = NULL;
         glusterd_conf_t *priv = NULL;
         char            path[PATH_MAX] = {0,};
 
@@ -1763,10 +1854,10 @@ glusterd_retrieve_uuid ()
         if (!priv->handle) {
                 snprintf (path, PATH_MAX, "%s/%s", priv->workdir,
                           GLUSTERD_INFO_FILE);
-                ret = glusterd_store_handle_retrieve (path, &handle);
+                ret = gf_store_handle_retrieve (path, &handle);
 
                 if (ret) {
-                        gf_log ("", GF_LOG_ERROR, "Unable to get store "
+                        gf_log ("", GF_LOG_DEBUG, "Unable to get store"
                                 "handle!");
                         goto out;
                 }
@@ -1774,12 +1865,11 @@ glusterd_retrieve_uuid ()
                 priv->handle = handle;
         }
 
-        ret = glusterd_store_retrieve_value (priv->handle,
-                                             GLUSTERD_STORE_UUID_KEY,
-                                             &uuid_str);
+        ret = gf_store_retrieve_value (priv->handle, GLUSTERD_STORE_UUID_KEY,
+                                       &uuid_str);
 
         if (ret) {
-                gf_log ("", GF_LOG_INFO, "No previous uuid is present");
+                gf_log ("", GF_LOG_DEBUG, "No previous uuid is present");
                 goto out;
         }
 
@@ -1791,247 +1881,13 @@ out:
         return ret;
 }
 
-int32_t
-glusterd_store_iter_new (glusterd_store_handle_t  *shandle,
-                         glusterd_store_iter_t  **iter)
-{
-        int32_t                 ret = -1;
-        glusterd_store_iter_t   *tmp_iter = NULL;
-        int                     fd = -1;
-
-        GF_ASSERT (shandle);
-        GF_ASSERT (iter);
-
-        tmp_iter = GF_CALLOC (1, sizeof (*tmp_iter),
-                             gf_gld_mt_store_iter_t);
-
-        if (!tmp_iter) {
-                gf_log ("", GF_LOG_ERROR, "Out of Memory");
-                goto out;
-        }
-
-        fd = open (shandle->path, O_RDWR);
-
-        if (fd < 0) {
-                gf_log ("", GF_LOG_ERROR, "Unable to open %s, errno: %d",
-                        shandle->path, errno);
-                goto out;
-        }
-
-        tmp_iter->fd = fd;
-
-        tmp_iter->file = fdopen (tmp_iter->fd, "r");
-
-        if (!tmp_iter->file) {
-                gf_log ("", GF_LOG_ERROR, "Unable to open file %s errno: %d",
-                        shandle->path, errno);
-                goto out;
-        }
-
-        strncpy (tmp_iter->filepath, shandle->path, sizeof (tmp_iter->filepath));
-        tmp_iter->filepath[sizeof (tmp_iter->filepath) - 1] = 0;
-        *iter = tmp_iter;
-        ret = 0;
-
-out:
-        gf_log ("", GF_LOG_DEBUG, "Returning with %d", ret);
-        return ret;
-}
-
-int32_t
-glusterd_store_validate_key_value (char *storepath, char *key, char*val,
-                                   glusterd_store_op_errno_t *op_errno)
-{
-        int ret = 0;
-
-        GF_ASSERT (op_errno);
-        GF_ASSERT (storepath);
-
-        if ((key == NULL) && (val == NULL)) {
-                ret = -1;
-                gf_log ("glusterd", GF_LOG_ERROR, "Glusterd store may be "
-                        "corrupted, Invalid key and value (null) in %s",
-                        storepath);
-                *op_errno = GD_STORE_KEY_VALUE_NULL;
-        } else if (key == NULL) {
-                ret = -1;
-                gf_log ("glusterd", GF_LOG_ERROR, "Glusterd store may be "
-                        "corrupted, Invalid key (null) in %s", storepath);
-                *op_errno = GD_STORE_KEY_NULL;
-        } else if (val == NULL) {
-                ret = -1;
-                gf_log ("glusterd", GF_LOG_ERROR, "Glusterd store may be "
-                        "corrupted, Invalid value (null) for key %s in %s",
-                        key, storepath);
-                *op_errno = GD_STORE_VALUE_NULL;
-        } else {
-                ret = 0;
-                *op_errno = GD_STORE_SUCCESS;
-        }
-
-        return ret;
-}
-
-int32_t
-glusterd_store_iter_get_next (glusterd_store_iter_t *iter,
-                              char  **key, char **value,
-                              glusterd_store_op_errno_t *op_errno)
-{
-        int32_t         ret = -1;
-        char            *scan_str = NULL;
-        char            *free_str = NULL;
-        char            *iter_key = NULL;
-        char            *iter_val = NULL;
-        struct stat     st        = {0,};
-        glusterd_store_op_errno_t store_errno = GD_STORE_SUCCESS;
-
-        GF_ASSERT (iter);
-        GF_ASSERT (iter->file);
-        GF_ASSERT (key);
-        GF_ASSERT (value);
-
-        ret = fstat (iter->fd, &st);
-        if (ret < 0) {
-                gf_log ("glusterd", GF_LOG_WARNING,
-                        "stat on file failed");
-                ret = -1;
-                store_errno = GD_STORE_STAT_FAILED;
-                goto out;
-        }
-
-        scan_str = GF_CALLOC (1, st.st_size,
-                              gf_gld_mt_char);
-        if (scan_str == NULL) {
-                ret = -1;
-                store_errno = GD_STORE_ENOMEM;
-                goto out;
-        }
-
-        *key = NULL;
-        *value = NULL;
-
-        free_str = scan_str;
-
-        ret = glusterd_store_read_and_tokenize (iter->file, scan_str,
-                                                &iter_key, &iter_val,
-                                                &store_errno);
-        if (ret < 0) {
-                goto out;
-        }
-
-
-        ret = glusterd_store_validate_key_value (iter->filepath, iter_key,
-                                                 iter_val, &store_errno);
-        if (ret)
-                goto out;
-
-        *value = gf_strdup (iter_val);
-
-        *key   = gf_strdup (iter_key);
-        if (!iter_key || !iter_val) {
-                ret = -1;
-                store_errno = GD_STORE_ENOMEM;
-                goto out;
-        }
-
-        ret = 0;
-
-out:
-        if (ret) {
-                if (*key) {
-                        GF_FREE (*key);
-                        *key = NULL;
-                }
-                if (*value) {
-                        GF_FREE (*value);
-                        *value = NULL;
-                }
-        }
-        GF_FREE (free_str);
-        if (op_errno)
-                *op_errno = store_errno;
-
-        gf_log ("", GF_LOG_DEBUG, "Returning with %d", ret);
-        return ret;
-}
-
-int32_t
-glusterd_store_iter_get_matching (glusterd_store_iter_t *iter,
-                              char  *key, char **value)
-{
-        int32_t ret = -1;
-        char    *tmp_key = NULL;
-        char    *tmp_value = NULL;
-
-        ret = glusterd_store_iter_get_next (iter, &tmp_key, &tmp_value,
-                                            NULL);
-        while (!ret) {
-                if (!strncmp (key, tmp_key, strlen (key))){
-                        *value = tmp_value;
-                        GF_FREE (tmp_key);
-                        goto out;
-                }
-                GF_FREE (tmp_key);
-                GF_FREE (tmp_value);
-                ret = glusterd_store_iter_get_next (iter, &tmp_key,
-                                                    &tmp_value, NULL);
-        }
-out:
-        return ret;
-}
-
-int32_t
-glusterd_store_iter_destroy (glusterd_store_iter_t *iter)
-{
-        int32_t         ret = -1;
-
-        if (!iter)
-                return 0;
-
-        if (iter->file)
-                ret = fclose (iter->file);
-        else
-                ret = 0;
-
-        if (ret) {
-                gf_log ("", GF_LOG_ERROR, "Unable to close fd: %d, ret: %d, "
-                        "errno: %d" ,iter->fd, ret, errno);
-        }
-
-        GF_FREE (iter);
-
-        return ret;
-}
-
-char*
-glusterd_store_strerror (glusterd_store_op_errno_t op_errno)
-{
-        switch (op_errno) {
-        case GD_STORE_SUCCESS:
-                return "Success";
-        case GD_STORE_KEY_NULL:
-                return "Invalid Key";
-        case GD_STORE_VALUE_NULL:
-                return "Invalid Value";
-        case GD_STORE_KEY_VALUE_NULL:
-                return "Invalid Key and Value";
-        case GD_STORE_EOF:
-                return "No data";
-        case GD_STORE_ENOMEM:
-                return "No memory";
-        default:
-                return "Invalid errno";
-        }
-        return "Invalid errno";
-}
 
 int32_t
 glusterd_store_retrieve_bricks (glusterd_volinfo_t *volinfo)
 {
-
         int32_t                 ret = 0;
         glusterd_brickinfo_t    *brickinfo = NULL;
-        glusterd_store_iter_t   *iter = NULL;
+        gf_store_iter_t         *iter = NULL;
         char                    *key = NULL;
         char                    *value = NULL;
         char                    brickdir[PATH_MAX] = {0,};
@@ -2039,20 +1895,19 @@ glusterd_store_retrieve_bricks (glusterd_volinfo_t *volinfo)
         glusterd_conf_t         *priv = NULL;
         int32_t                 brick_count = 0;
         char                    tmpkey[4096] = {0,};
-        glusterd_store_iter_t   *tmpiter = NULL;
+        gf_store_iter_t         *tmpiter = NULL;
         char                    *tmpvalue = NULL;
-        struct pmap_registry *pmap = NULL;
-        glusterd_store_op_errno_t       op_errno = GD_STORE_SUCCESS;
+        struct pmap_registry    *pmap = NULL;
+        gf_store_op_errno_t     op_errno = GD_STORE_SUCCESS;
 
         GF_ASSERT (volinfo);
         GF_ASSERT (volinfo->volname);
 
         priv = THIS->private;
 
-        GLUSTERD_GET_BRICK_DIR (brickdir, volinfo, priv)
-
-        ret = glusterd_store_iter_new (volinfo->shandle, &tmpiter);
+        GLUSTERD_GET_BRICK_DIR (brickdir, volinfo, priv);
 
+        ret = gf_store_iter_new (volinfo->shandle, &tmpiter);
         if (ret)
                 goto out;
 
@@ -2063,30 +1918,28 @@ glusterd_store_retrieve_bricks (glusterd_volinfo_t *volinfo)
                         goto out;
                 snprintf (tmpkey, sizeof (tmpkey), "%s-%d",
                           GLUSTERD_STORE_KEY_VOL_BRICK,brick_count);
-                ret = glusterd_store_iter_get_matching (tmpiter, tmpkey,
-                                                        &tmpvalue);
+                ret = gf_store_iter_get_matching (tmpiter, tmpkey, &tmpvalue);
                 snprintf (path, sizeof (path), "%s/%s", brickdir, tmpvalue);
 
                 GF_FREE (tmpvalue);
 
                 tmpvalue = NULL;
 
-                ret = glusterd_store_handle_retrieve (path, &brickinfo->shandle);
+                ret = gf_store_handle_retrieve (path, &brickinfo->shandle);
 
                 if (ret)
                         goto out;
 
-                ret = glusterd_store_iter_new (brickinfo->shandle, &iter);
+                ret = gf_store_iter_new (brickinfo->shandle, &iter);
 
                 if (ret)
                         goto out;
 
-                ret = glusterd_store_iter_get_next (iter, &key, &value,
-                                                    &op_errno);
+                ret = gf_store_iter_get_next (iter, &key, &value, &op_errno);
                 if (ret) {
                         gf_log ("glusterd", GF_LOG_ERROR, "Unable to iterate "
                                 "the store for brick: %s, reason: %s", path,
-                                glusterd_store_strerror (op_errno));
+                                gf_store_strerror (op_errno));
                         goto out;
                 }
                 while (!ret) {
@@ -2101,7 +1954,7 @@ glusterd_store_retrieve_bricks (glusterd_volinfo_t *volinfo)
                                     strlen (GLUSTERD_STORE_KEY_BRICK_PORT))) {
                                 gf_string2int (value, &brickinfo->port);
 
-                                if (brickinfo->port < GF_IANA_PRIV_PORTS_START){
+                                if (brickinfo->port < priv->base_port) {
                                         /* This is required to adhere to the
                                            IANA standards */
                                         brickinfo->port = 0;
@@ -2117,8 +1970,7 @@ glusterd_store_retrieve_bricks (glusterd_volinfo_t *volinfo)
                                     strlen (GLUSTERD_STORE_KEY_BRICK_RDMA_PORT))) {
                                 gf_string2int (value, &brickinfo->rdma_port);
 
-                                if (brickinfo->rdma_port <
-                                    GF_IANA_PRIV_PORTS_START){
+                                if (brickinfo->rdma_port < priv->base_port) {
                                         /* This is required to adhere to the
                                            IANA standards */
                                         brickinfo->rdma_port = 0;
@@ -2135,6 +1987,18 @@ glusterd_store_retrieve_bricks (glusterd_volinfo_t *volinfo)
                         } else if (!strncmp (key, GLUSTERD_STORE_KEY_BRICK_DECOMMISSIONED,
                                              strlen (GLUSTERD_STORE_KEY_BRICK_DECOMMISSIONED))) {
                                 gf_string2int (value, &brickinfo->decommissioned);
+                        } else if (!strncmp (key, GLUSTERD_STORE_KEY_BRICK_DEVICE_PATH,
+                                             strlen (GLUSTERD_STORE_KEY_BRICK_DEVICE_PATH))) {
+                                strncpy (brickinfo->device_path, value,
+                                         sizeof (brickinfo->device_path));
+                        } else if (!strncmp (key, GLUSTERD_STORE_KEY_BRICK_SNAP_STATUS,
+                                             strlen (GLUSTERD_STORE_KEY_BRICK_SNAP_STATUS))) {
+                                gf_string2int (value, &brickinfo->snap_status);
+                        } else if (!strncmp (key,
+                                    GLUSTERD_STORE_KEY_BRICK_VGNAME,
+                                    strlen (GLUSTERD_STORE_KEY_BRICK_VGNAME))) {
+                                strncpy (brickinfo->vg, value,
+                                         sizeof (brickinfo->vg));
                         } else {
                                 gf_log ("", GF_LOG_ERROR, "Unknown key: %s",
                                         key);
@@ -2145,13 +2009,13 @@ glusterd_store_retrieve_bricks (glusterd_volinfo_t *volinfo)
                         key = NULL;
                         value = NULL;
 
-                        ret = glusterd_store_iter_get_next (iter, &key, &value,
-                                                            &op_errno);
+                        ret = gf_store_iter_get_next (iter, &key, &value,
+                                                      &op_errno);
                 }
 
                 if (op_errno != GD_STORE_EOF)
                         goto out;
-                ret = glusterd_store_iter_destroy (iter);
+                ret = gf_store_iter_destroy (iter);
 
                 if (ret)
                         goto out;
@@ -2160,7 +2024,7 @@ glusterd_store_retrieve_bricks (glusterd_volinfo_t *volinfo)
                 brick_count++;
         }
 
-        ret = glusterd_store_iter_destroy (tmpiter);
+        ret = gf_store_iter_destroy (tmpiter);
         if (ret)
                 goto out;
 out:
@@ -2171,42 +2035,39 @@ out:
 
 
 int32_t
-glusterd_store_retrieve_rbstate (char   *volname)
+glusterd_store_retrieve_rbstate (glusterd_volinfo_t *volinfo)
 {
         int32_t                   ret                   = -1;
-        glusterd_volinfo_t        *volinfo              = NULL;
-        glusterd_store_iter_t     *iter                 = NULL;
+        gf_store_iter_t           *iter                 = NULL;
         char                      *key                  = NULL;
         char                      *value                = NULL;
         char                      volpath[PATH_MAX]     = {0,};
         glusterd_conf_t           *priv                 = NULL;
         char                      path[PATH_MAX]        = {0,};
-        glusterd_store_op_errno_t op_errno              = GD_STORE_SUCCESS;
-
-        priv = THIS->private;
+        gf_store_op_errno_t       op_errno              = GD_STORE_SUCCESS;
+        xlator_t                 *this                  = NULL;
 
-        ret = glusterd_volinfo_find (volname, &volinfo);
-        if (ret) {
-                gf_log (THIS->name, GF_LOG_ERROR, "Couldn't get"
-                        "volinfo for %s.", volname);
-                goto out;
-        }
+        this = THIS;
+        GF_ASSERT (this);
+        priv = this->private;
+        GF_ASSERT (priv);
+        GF_ASSERT (volinfo);
 
         GLUSTERD_GET_VOLUME_DIR(volpath, volinfo, priv);
         snprintf (path, sizeof (path), "%s/%s", volpath,
                   GLUSTERD_VOLUME_RBSTATE_FILE);
 
-        ret = glusterd_store_handle_retrieve (path, &volinfo->rb_shandle);
+        ret = gf_store_handle_retrieve (path, &volinfo->rb_shandle);
 
         if (ret)
                 goto out;
 
-        ret = glusterd_store_iter_new (volinfo->rb_shandle, &iter);
+        ret = gf_store_iter_new (volinfo->rb_shandle, &iter);
 
         if (ret)
                 goto out;
 
-        ret = glusterd_store_iter_get_next (iter, &key, &value, &op_errno);
+        ret = gf_store_iter_get_next (iter, &key, &value, &op_errno);
         if (ret)
                 goto out;
 
@@ -2255,61 +2116,56 @@ glusterd_store_retrieve_rbstate (char   *volname)
                 key = NULL;
                 value = NULL;
 
-                ret = glusterd_store_iter_get_next (iter, &key, &value,
-                                                    &op_errno);
+                ret = gf_store_iter_get_next (iter, &key, &value, &op_errno);
         }
 
         if (op_errno != GD_STORE_EOF)
                 goto out;
 
-        ret = glusterd_store_iter_destroy (iter);
+        ret = gf_store_iter_destroy (iter);
 
         if (ret)
                 goto out;
 
 out:
-        gf_log ("", GF_LOG_DEBUG, "Returning with %d", ret);
+        gf_log (this->name, GF_LOG_TRACE, "Returning with %d", ret);
 
         return ret;
 }
 
 int32_t
-glusterd_store_retrieve_node_state (char   *volname)
+glusterd_store_retrieve_node_state (glusterd_volinfo_t *volinfo)
 {
         int32_t                   ret                   = -1;
-        glusterd_volinfo_t        *volinfo              = NULL;
-        glusterd_store_iter_t     *iter                 = NULL;
+        gf_store_iter_t           *iter                 = NULL;
         char                      *key                  = NULL;
         char                      *value                = NULL;
         char                      volpath[PATH_MAX]     = {0,};
         glusterd_conf_t           *priv                 = NULL;
         char                      path[PATH_MAX]        = {0,};
-        glusterd_store_op_errno_t op_errno              = GD_STORE_SUCCESS;
-
-        priv = THIS->private;
+        gf_store_op_errno_t       op_errno              = GD_STORE_SUCCESS;
+        xlator_t                 *this                  = NULL;
 
-        ret = glusterd_volinfo_find (volname, &volinfo);
-        if (ret) {
-                gf_log (THIS->name, GF_LOG_ERROR, "Couldn't get"
-                        "volinfo for %s.", volname);
-                goto out;
-        }
+        this = THIS;
+        GF_ASSERT (this);
+        priv = this->private;
+        GF_ASSERT (priv);
+        GF_ASSERT (volinfo);
 
         GLUSTERD_GET_VOLUME_DIR(volpath, volinfo, priv);
         snprintf (path, sizeof (path), "%s/%s", volpath,
                   GLUSTERD_NODE_STATE_FILE);
 
-        ret = glusterd_store_handle_retrieve (path,
-                                              &volinfo->node_state_shandle);
+        ret = gf_store_handle_retrieve (path, &volinfo->node_state_shandle);
         if (ret)
                 goto out;
 
-        ret = glusterd_store_iter_new (volinfo->node_state_shandle, &iter);
+        ret = gf_store_iter_new (volinfo->node_state_shandle, &iter);
 
         if (ret)
                 goto out;
 
-        ret = glusterd_store_iter_get_next (iter, &key, &value, &op_errno);
+        ret = gf_store_iter_get_next (iter, &key, &value, &op_errno);
         if (ret)
                 goto out;
 
@@ -2334,66 +2190,70 @@ glusterd_store_retrieve_node_state (char   *volname)
                 key = NULL;
                 value = NULL;
 
-                ret = glusterd_store_iter_get_next (iter, &key, &value,
-                                                    &op_errno);
+                ret = gf_store_iter_get_next (iter, &key, &value, &op_errno);
         }
 
         if (op_errno != GD_STORE_EOF)
                 goto out;
 
-        ret = glusterd_store_iter_destroy (iter);
+        ret = gf_store_iter_destroy (iter);
 
         if (ret)
                 goto out;
 
 out:
-        gf_log ("", GF_LOG_DEBUG, "Returning with %d", ret);
+        gf_log (this->name, GF_LOG_TRACE, "Returning with %d", ret);
 
         return ret;
 }
 
-int32_t
-glusterd_store_retrieve_volume (char    *volname)
-{
-        int32_t                   ret                   = -1;
-        glusterd_volinfo_t        *volinfo              = NULL;
-        glusterd_store_iter_t     *iter                 = NULL;
-        char                      *key                  = NULL;
-        char                      *value                = NULL;
-        char                      volpath[PATH_MAX]     = {0,};
-        glusterd_conf_t           *priv                 = NULL;
-        char                      path[PATH_MAX]        = {0,};
-        int                       exists                = 0;
-        glusterd_store_op_errno_t op_errno              = GD_STORE_SUCCESS;
 
-        ret = glusterd_volinfo_new (&volinfo);
-
-        if (ret)
-                goto out;
+int
+glusterd_store_update_volinfo (glusterd_volinfo_t *volinfo)
+{
+        int                     ret = -1;
+        int                     exists                  = 0;
+        char                    *key                    = NULL;
+        char                    *value                  = NULL;
+        char                    volpath[PATH_MAX]       = {0,};
+        char                    path[PATH_MAX]          = {0,};
+        xlator_t                *this                   = NULL;
+        glusterd_conf_t         *conf                   = NULL;
+        gf_store_iter_t         *iter                   = NULL;
+        gf_store_op_errno_t     op_errno                = GD_STORE_SUCCESS;
 
-        strncpy (volinfo->volname, volname, GLUSTERD_MAX_VOLUME_NAME);
+        this = THIS;
+        GF_ASSERT (this);
+        conf = THIS->private;
+        GF_ASSERT (volinfo);
 
-        priv = THIS->private;
+        GLUSTERD_GET_VOLUME_DIR(volpath, volinfo, conf);
 
-        GLUSTERD_GET_VOLUME_DIR(volpath, volinfo, priv);
         snprintf (path, sizeof (path), "%s/%s", volpath,
                   GLUSTERD_VOLUME_INFO_FILE);
 
-        ret = glusterd_store_handle_retrieve (path, &volinfo->shandle);
-
-        if (ret)
+        ret = gf_store_handle_retrieve (path, &volinfo->shandle);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "volinfo handle is NULL");
                 goto out;
+        }
 
-        ret = glusterd_store_iter_new (volinfo->shandle, &iter);
-
-        if (ret)
+        ret = gf_store_iter_new (volinfo->shandle, &iter);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to get new store "
+                        "iter");
                 goto out;
+        }
 
-        ret = glusterd_store_iter_get_next (iter, &key, &value, &op_errno);
-        if (ret)
+        ret = gf_store_iter_get_next (iter, &key, &value, &op_errno);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to get next store "
+                        "iter");
                 goto out;
+        }
 
         while (!ret) {
+                gf_log ("", GF_LOG_DEBUG, "key = %s value = %s", key, value);
                 if (!strncmp (key, GLUSTERD_STORE_KEY_VOL_TYPE,
                               strlen (GLUSTERD_STORE_KEY_VOL_TYPE))) {
                         volinfo->type = atoi (value);
@@ -2453,9 +2313,24 @@ glusterd_store_retrieve_volume (char    *volname)
                         gf_log ("", GF_LOG_DEBUG, "Parsed as "GEOREP" "
                                 " slave:key=%s,value:%s", key, value);
 
-                } else if (!strncmp (key, GLUSTERD_STORE_KEY_VOL_BACKEND,
-                                     strlen (GLUSTERD_STORE_KEY_VOL_BACKEND))) {
-                        volinfo->backend = atoi (value);
+                } else if (!strncmp (key, GLUSTERD_STORE_KEY_VOL_OP_VERSION,
+                                strlen (GLUSTERD_STORE_KEY_VOL_OP_VERSION))) {
+                        volinfo->op_version = atoi (value);
+                } else if (!strncmp (key, GLUSTERD_STORE_KEY_VOL_CLIENT_OP_VERSION,
+                                strlen (GLUSTERD_STORE_KEY_VOL_CLIENT_OP_VERSION))) {
+                        volinfo->client_op_version = atoi (value);
+                } else if (!strncmp (key, GLUSTERD_STORE_KEY_VOL_CAPS,
+                                     strlen (GLUSTERD_STORE_KEY_VOL_CAPS))) {
+                        volinfo->caps = atoi (value);
+                } else if (!strncmp (key, GLUSTERD_STORE_KEY_SNAP_MAX_HARD_LIMIT,
+                                strlen (GLUSTERD_STORE_KEY_SNAP_MAX_HARD_LIMIT))) {
+                        volinfo->snap_max_hard_limit = (uint64_t) atoll (value);
+                } else if (!strncmp (key, GLUSTERD_STORE_KEY_VOL_IS_RESTORED,
+                                     strlen (GLUSTERD_STORE_KEY_VOL_IS_RESTORED))) {
+                        volinfo->is_volume_restored = atoi (value);
+                } else if (!strncmp (key, GLUSTERD_STORE_KEY_PARENT_VOLNAME,
+                                strlen (GLUSTERD_STORE_KEY_PARENT_VOLNAME))) {
+                        strncpy (volinfo->parent_volname, value, sizeof(volinfo->parent_volname) - 1);
                 } else {
 
                         if (is_key_glusterd_hooks_friendly (key)) {
@@ -2495,8 +2370,7 @@ glusterd_store_retrieve_volume (char    *volname)
                 key = NULL;
                 value = NULL;
 
-                ret = glusterd_store_iter_get_next (iter, &key, &value,
-                                                    &op_errno);
+                ret = gf_store_iter_get_next (iter, &key, &value, &op_errno);
         }
 
         /* backward compatibility */
@@ -2535,16 +2409,59 @@ glusterd_store_retrieve_volume (char    *volname)
                 volinfo->subvol_count = (volinfo->brick_count /
                                          volinfo->dist_leaf_count);
 
+                /* Only calculate volume op-versions if they are not found */
+                if (!volinfo->op_version && !volinfo->client_op_version)
+                        gd_update_volume_op_versions (volinfo);
         }
 
         if (op_errno != GD_STORE_EOF)
                 goto out;
 
-        ret = glusterd_store_iter_destroy (iter);
+        ret = gf_store_iter_destroy (iter);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to destroy store "
+                        "iter");
+                goto out;
+        }
+
+        ret = 0;
+out:
+        return ret;
+}
+
+glusterd_volinfo_t*
+glusterd_store_retrieve_volume (char *volname, glusterd_snap_t *snap)
+{
+        int32_t                    ret                  = -1;
+        glusterd_volinfo_t        *volinfo              = NULL;
+        glusterd_volinfo_t        *origin_volinfo       = NULL;
+        glusterd_conf_t           *priv                 = NULL;
+        xlator_t                  *this                 = NULL;
 
+        this = THIS;
+        GF_ASSERT (this);
+        priv = this->private;
+        GF_ASSERT (priv);
+        GF_ASSERT (volname);
+
+        ret = glusterd_volinfo_new (&volinfo);
         if (ret)
                 goto out;
 
+        priv = THIS->private;
+
+        strncpy (volinfo->volname, volname, GLUSTERD_MAX_VOLUME_NAME);
+        volinfo->snapshot = snap;
+        if (snap)
+                volinfo->is_snap_volume = _gf_true;
+
+        ret = glusterd_store_update_volinfo (volinfo);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to update volinfo "
+                        "for %s volume", volname);
+                goto out;
+        }
+
         ret = glusterd_store_retrieve_bricks (volinfo);
         if (ret)
                 goto out;
@@ -2553,12 +2470,28 @@ glusterd_store_retrieve_volume (char    *volname)
         if (ret)
                 goto out;
 
-        list_add_tail (&volinfo->vol_list, &priv->volumes);
-
+        if (!snap) {
+                list_add_tail (&volinfo->vol_list, &priv->volumes);
+        } else {
+                ret = glusterd_volinfo_find (volinfo->parent_volname,
+                                             &origin_volinfo);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR, "Parent volinfo "
+                                "not found for %s volume", volname);
+                        goto out;
+                }
+                glusterd_list_add_snapvol (origin_volinfo, volinfo);
+        }
 out:
-        gf_log ("", GF_LOG_DEBUG, "Returning with %d", ret);
+        if (ret) {
+                if (volinfo)
+                        glusterd_volinfo_delete (volinfo);
+                volinfo = NULL;
+        }
 
-        return ret;
+        gf_log (this->name, GF_LOG_TRACE, "Returning with %d", ret);
+
+        return volinfo;
 }
 
 inline void
@@ -2570,16 +2503,16 @@ glusterd_store_set_options_path (glusterd_conf_t *conf, char *path, size_t len)
 int
 _store_global_opts (dict_t *this, char *key, data_t *value, void *data)
 {
-        glusterd_store_handle_t *shandle = data;
+        gf_store_handle_t *shandle = data;
 
-        glusterd_store_save_value (shandle->fd, key, (char*)value->data);
+        gf_store_save_value (shandle->fd, key, (char*)value->data);
         return 0;
 }
 
 int32_t
 glusterd_store_options (xlator_t *this, dict_t *opts)
 {
-        glusterd_store_handle_t         *shandle = NULL;
+        gf_store_handle_t               *shandle = NULL;
         glusterd_conf_t                 *conf = NULL;
         char                            path[PATH_MAX] = {0};
         int                             fd = -1;
@@ -2588,11 +2521,11 @@ glusterd_store_options (xlator_t *this, dict_t *opts)
         conf = this->private;
         glusterd_store_set_options_path (conf, path, sizeof (path));
 
-        ret = glusterd_store_handle_new (path, &shandle);
+        ret = gf_store_handle_new (path, &shandle);
         if (ret)
                 goto out;
 
-        fd = glusterd_store_mkstemp (shandle);
+        fd = gf_store_mkstemp (shandle);
         if (fd <= 0) {
                 ret = -1;
                 goto out;
@@ -2601,11 +2534,11 @@ glusterd_store_options (xlator_t *this, dict_t *opts)
         shandle->fd = fd;
         dict_foreach (opts, _store_global_opts, shandle);
         shandle->fd = 0;
-        ret = glusterd_store_rename_tmppath (shandle);
+        ret = gf_store_rename_tmppath (shandle);
         if (ret)
                 goto out;
 out:
-        glusterd_store_handle_destroy (shandle);
+        gf_store_handle_destroy (shandle);
         if (fd >=0 )
                 close (fd);
         return ret;
@@ -2616,25 +2549,25 @@ glusterd_store_retrieve_options (xlator_t *this)
 {
         char                            path[PATH_MAX] = {0};
         glusterd_conf_t                 *conf = NULL;
-        glusterd_store_handle_t         *shandle = NULL;
-        glusterd_store_iter_t           *iter = NULL;
+        gf_store_handle_t               *shandle = NULL;
+        gf_store_iter_t                 *iter = NULL;
         char                            *key = NULL;
         char                            *value = NULL;
-        glusterd_store_op_errno_t       op_errno = 0;
+        gf_store_op_errno_t             op_errno = 0;
         int                             ret = -1;
 
         conf = this->private;
         glusterd_store_set_options_path (conf, path, sizeof (path));
 
-        ret = glusterd_store_handle_retrieve (path, &shandle);
+        ret = gf_store_handle_retrieve (path, &shandle);
         if (ret)
                 goto out;
 
-        ret = glusterd_store_iter_new (shandle, &iter);
+        ret = gf_store_iter_new (shandle, &iter);
         if (ret)
                 goto out;
 
-        ret = glusterd_store_iter_get_next (iter, &key, &value, &op_errno);
+        ret = gf_store_iter_get_next (iter, &key, &value, &op_errno);
         while (!ret) {
                 ret = dict_set_dynstr (conf->opts, key, value);
                 if (ret) {
@@ -2646,22 +2579,21 @@ glusterd_store_retrieve_options (xlator_t *this)
                 key = NULL;
                 value = NULL;
 
-                ret = glusterd_store_iter_get_next (iter, &key, &value,
-                                                    &op_errno);
+                ret = gf_store_iter_get_next (iter, &key, &value, &op_errno);
         }
         if (op_errno != GD_STORE_EOF)
                 goto out;
         ret = 0;
 out:
-        glusterd_store_iter_destroy (iter);
-        glusterd_store_handle_destroy (shandle);
+        gf_store_iter_destroy (iter);
+        gf_store_handle_destroy (shandle);
         return ret;
 }
 
 int32_t
-glusterd_store_retrieve_volumes (xlator_t  *this)
+glusterd_store_retrieve_volumes (xlator_t  *this, glusterd_snap_t *snap)
 {
-        int32_t                ret              = 0;
+        int32_t                ret              = -1;
         char                   path[PATH_MAX]   = {0,};
         glusterd_conf_t       *priv             = NULL;
         DIR                   *dir              = NULL;
@@ -2673,51 +2605,58 @@ glusterd_store_retrieve_volumes (xlator_t  *this)
 
         GF_ASSERT (priv);
 
-        snprintf (path, PATH_MAX, "%s/%s", priv->workdir,
-                        GLUSTERD_VOLUME_DIR_PREFIX);
+        if (snap)
+                snprintf (path, PATH_MAX, "%s/snaps/%s", priv->workdir,
+                          snap->snapname);
+        else
+                snprintf (path, PATH_MAX, "%s/%s", priv->workdir,
+                          GLUSTERD_VOLUME_DIR_PREFIX);
 
         dir = opendir (path);
 
         if (!dir) {
                 gf_log ("", GF_LOG_ERROR, "Unable to open dir %s", path);
-                ret = -1;
                 goto out;
         }
 
         glusterd_for_each_entry (entry, dir);
 
         while (entry) {
-                ret = glusterd_store_retrieve_volume (entry->d_name);
-                if (ret) {
+                if ( entry->d_type != DT_DIR )
+                        goto next;
+
+                volinfo = glusterd_store_retrieve_volume (entry->d_name, snap);
+                if (!volinfo) {
                         gf_log ("", GF_LOG_ERROR, "Unable to restore "
                                 "volume: %s", entry->d_name);
+                        ret = -1;
                         goto out;
                 }
 
-                ret = glusterd_store_retrieve_rbstate (entry->d_name);
+                ret = glusterd_store_retrieve_rbstate (volinfo);
                 if (ret) {
                         /* Backward compatibility */
                         gf_log ("", GF_LOG_INFO, "Creating a new rbstate "
                                 "for volume: %s.", entry->d_name);
-                        ret = glusterd_volinfo_find (entry->d_name, &volinfo);
                         ret = glusterd_store_create_rbstate_shandle_on_absence (volinfo);
                         ret = glusterd_store_perform_rbstate_store (volinfo);
                 }
 
-                ret = glusterd_store_retrieve_node_state (entry->d_name);
+                ret = glusterd_store_retrieve_node_state (volinfo);
                 if (ret) {
                         /* Backward compatibility */
                         gf_log ("", GF_LOG_INFO, "Creating a new node_state "
                                 "for volume: %s.", entry->d_name);
-                        ret = glusterd_volinfo_find (entry->d_name, &volinfo);
-                        ret =
                         glusterd_store_create_nodestate_sh_on_absence (volinfo);
                         ret = glusterd_store_perform_node_state_store (volinfo);
 
                 }
+
+next:
                 glusterd_for_each_entry (entry, dir);
         }
 
+        ret = 0;
 out:
         if (dir)
                 closedir (dir);
@@ -2727,6 +2666,482 @@ out:
 }
 
 int32_t
+glusterd_resolve_snap_bricks (xlator_t  *this, glusterd_snap_t *snap)
+{
+        int32_t                 ret = -1;
+        glusterd_volinfo_t      *volinfo = NULL;
+        glusterd_brickinfo_t    *brickinfo = NULL;
+
+        GF_ASSERT (this);
+        GF_VALIDATE_OR_GOTO (this->name, snap, out);
+
+        list_for_each_entry (volinfo, &snap->volumes, vol_list) {
+                list_for_each_entry (brickinfo, &volinfo->bricks, brick_list) {
+                        ret = glusterd_resolve_brick (brickinfo);
+                        if (ret) {
+                                gf_log (this->name, GF_LOG_ERROR,
+                                        "resolve brick failed in restore");
+                                goto out;
+                        }
+                }
+        }
+
+        ret = 0;
+
+out:
+        gf_log (this->name, GF_LOG_TRACE, "Returning with %d", ret);
+
+        return ret;
+}
+
+int
+glusterd_store_update_snap (glusterd_snap_t *snap)
+{
+        int                     ret = -1;
+        char                    *key                    = NULL;
+        char                    *value                  = NULL;
+        char                    snappath[PATH_MAX]      = {0,};
+        char                    path[PATH_MAX]          = {0,};
+        xlator_t                *this                   = NULL;
+        glusterd_conf_t         *conf                   = NULL;
+        gf_store_iter_t         *iter                   = NULL;
+        gf_store_op_errno_t     op_errno                = GD_STORE_SUCCESS;
+
+        this = THIS;
+        conf = this->private;
+        GF_ASSERT (snap);
+
+        GLUSTERD_GET_SNAP_DIR (snappath, snap, conf);
+
+        snprintf (path, sizeof (path), "%s/%s", snappath,
+                  GLUSTERD_SNAP_INFO_FILE);
+
+        ret = gf_store_handle_retrieve (path, &snap->shandle);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "snap handle is NULL");
+                goto out;
+        }
+
+        ret = gf_store_iter_new (snap->shandle, &iter);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to get new store "
+                        "iter");
+                goto out;
+        }
+
+        ret = gf_store_iter_get_next (iter, &key, &value, &op_errno);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to get next store "
+                        "iter");
+                goto out;
+        }
+
+        while (!ret) {
+                gf_log (this->name, GF_LOG_DEBUG, "key = %s value = %s",
+                        key, value);
+
+                if (!strncmp (key, GLUSTERD_STORE_KEY_SNAP_ID,
+                                     strlen (GLUSTERD_STORE_KEY_SNAP_ID))) {
+                        ret = uuid_parse (value, snap->snap_id);
+                        if (ret)
+                                gf_log (this->name, GF_LOG_WARNING,
+                                        "Failed to parse uuid");
+                } else if (!strncmp (key, GLUSTERD_STORE_KEY_SNAP_RESTORED,
+                                   strlen (GLUSTERD_STORE_KEY_SNAP_RESTORED))) {
+                        snap->snap_restored = atoi (value);
+                } else if (!strncmp (key, GLUSTERD_STORE_KEY_SNAP_STATUS,
+                                     strlen (GLUSTERD_STORE_KEY_SNAP_STATUS))) {
+                        snap->snap_status = atoi (value);
+                } else if (!strncmp (key, GLUSTERD_STORE_KEY_SNAP_DESC,
+                                     strlen (GLUSTERD_STORE_KEY_SNAP_DESC))) {
+                        snap->description = gf_strdup (value);
+                } else if (!strncmp (key, GLUSTERD_STORE_KEY_SNAP_TIMESTAMP,
+                                  strlen (GLUSTERD_STORE_KEY_SNAP_TIMESTAMP))) {
+                        snap->time_stamp = atoi (value);
+                }
+
+                GF_FREE (key);
+                GF_FREE (value);
+                key = NULL;
+                value = NULL;
+
+                ret = gf_store_iter_get_next (iter, &key, &value, &op_errno);
+        }
+
+        if (op_errno != GD_STORE_EOF)
+                goto out;
+
+        ret = gf_store_iter_destroy (iter);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to destroy store "
+                        "iter");
+        }
+
+out:
+        return ret;
+}
+
+int32_t
+glusterd_store_retrieve_snap (char *snapname)
+{
+        int32_t                ret    = -1;
+        dict_t                *dict   = NULL;
+        glusterd_snap_t       *snap   = NULL;
+        glusterd_conf_t       *priv   = NULL;
+        xlator_t              *this   = NULL;
+
+        this = THIS;
+        priv = this->private;
+        GF_ASSERT (priv);
+        GF_ASSERT (snapname);
+
+        dict = dict_new();
+        if (!dict) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Failed to create dict");
+                ret = -1;
+                goto out;
+        }
+
+        snap = glusterd_new_snap_object ();
+        if (!snap) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to create "
+                                                  " snap object");
+                goto out;
+        }
+
+        strncpy (snap->snapname, snapname, strlen(snapname));
+        ret = glusterd_store_update_snap (snap);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to update snapshot "
+                        "for %s snap", snapname);
+                goto out;
+        }
+
+        ret = glusterd_store_retrieve_volumes (this, snap);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to retrieve "
+                        "snap volumes for snap %s", snapname);
+                goto out;
+        }
+
+        /* Unlike bricks of normal volumes which are resolved at the end of
+           the glusterd restore, the bricks belonging to the snap volumes of
+           each snap should be resolved as part of snapshot restore itself.
+           Because if the snapshot has to be removed, then resolving bricks
+           helps glusterd in understanding what all bricks have its own uuid
+           and killing those bricks.
+        */
+        ret = glusterd_resolve_snap_bricks (this, snap);
+        if (ret)
+                gf_log (this->name, GF_LOG_WARNING, "resolving the snap bricks"
+                        " failed (snap: %s)", snap?snap->snapname:"");
+
+        /* When the snapshot command from cli is received, the on disk and
+           in memory structures for the snapshot are created (with the status)
+           being marked as GD_SNAP_STATUS_INIT. Once the backend snapshot is
+           taken, the status is changed to GD_SNAP_STATUS_IN_USE. If glusterd
+           dies after taking the backend snapshot, but before updating the
+           status, then when glusterd comes up, it should treat that snapshot
+           as a failed snapshot and clean it up.
+        */
+        if (snap->snap_status != GD_SNAP_STATUS_IN_USE) {
+                ret = glusterd_snap_remove (dict, snap, _gf_true, _gf_true);
+                if (ret)
+                        gf_log (this->name, GF_LOG_WARNING, "failed to remove"
+                                " the snapshot %s", snap->snapname);
+                goto out;
+        }
+
+        /* TODO: list_add_order can do 'N-square' comparisions and
+           is not efficient. Find a better solution to store the snap
+           in order */
+        list_add_order (&snap->snap_list, &priv->snapshots,
+                        glusterd_compare_snap_time);
+
+out:
+        if (dict)
+                dict_unref (dict);
+
+        gf_log (this->name, GF_LOG_TRACE, "Returning with %d", ret);
+        return ret;
+}
+
+/* Read the missed_snap_list and update the in-memory structs */
+int32_t
+glusterd_store_retrieve_missed_snaps_list (xlator_t  *this)
+{
+        char                   buf[PATH_MAX]    = "";
+        char                   path[PATH_MAX]   = "";
+        char                  *missed_node_info = NULL;
+        char                  *brick_path       = NULL;
+        char                  *value            = NULL;
+        char                  *save_ptr         = NULL;
+        FILE                  *fp               = NULL;
+        int32_t                brick_num        = -1;
+        int32_t                snap_op          = -1;
+        int32_t                snap_status      = -1;
+        int32_t                ret              = -1;
+        glusterd_conf_t       *priv             = NULL;
+        gf_store_op_errno_t    store_errno      = GD_STORE_SUCCESS;
+
+        GF_ASSERT (this);
+        priv = this->private;
+        GF_ASSERT (priv);
+
+        /* Get the path of the missed_snap_list */
+        glusterd_store_missed_snaps_list_path_set (path, sizeof(path));
+
+        fp = fopen (path, "r");
+        if (!fp) {
+                /* If errno is ENOENT then there are no missed snaps yet */
+                if (errno != ENOENT) {
+                        ret = -1;
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Failed to open %s. "
+                                "Error: %s", path, strerror(errno));
+                } else {
+                        gf_log (this->name, GF_LOG_INFO,
+                                "No missed snaps list.");
+                        ret = 0;
+                }
+                goto out;
+        }
+
+        do {
+                ret = gf_store_read_and_tokenize (fp, buf,
+                                                  &missed_node_info, &value,
+                                                  &store_errno);
+                if (ret) {
+                        if (store_errno == GD_STORE_EOF) {
+                                gf_log (this->name,
+                                        GF_LOG_DEBUG,
+                                        "EOF for missed_snap_list");
+                                ret = 0;
+                                break;
+                        }
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Failed to fetch data from "
+                                "missed_snaps_list. Error: %s",
+                                gf_store_strerror (store_errno));
+                        goto out;
+                }
+
+                /* Fetch the brick_num, brick_path, snap_op and snap status */
+                brick_num = atoi(strtok_r (value, ":", &save_ptr));
+                brick_path = strtok_r (NULL, ":", &save_ptr);
+                snap_op = atoi(strtok_r (NULL, ":", &save_ptr));
+                snap_status = atoi(strtok_r (NULL, ":", &save_ptr));
+
+                if (!missed_node_info || !brick_path ||
+                    brick_num < 1 || snap_op < 1 ||
+                    snap_status < 1) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Invalid missed_snap_entry");
+                        ret = -1;
+                        goto out;
+                }
+
+                ret = glusterd_store_missed_snaps_list (missed_node_info,
+                                                        brick_num,
+                                                        brick_path,
+                                                        snap_op,
+                                                        snap_status);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Failed to store missed snaps_list");
+                        goto out;
+                }
+
+        } while (store_errno == GD_STORE_SUCCESS);
+
+        ret = 0;
+out:
+        gf_log (this->name, GF_LOG_TRACE, "Returning with %d", ret);
+        return ret;
+}
+
+int32_t
+glusterd_store_retrieve_snaps (xlator_t  *this)
+{
+        int32_t                ret              = 0;
+        char                   path[PATH_MAX]   = {0,};
+        glusterd_conf_t       *priv             = NULL;
+        DIR                   *dir              = NULL;
+        struct dirent         *entry            = NULL;
+
+        GF_ASSERT (this);
+        priv = this->private;
+
+        GF_ASSERT (priv);
+
+        snprintf (path, PATH_MAX, "%s/snaps", priv->workdir);
+
+        dir = opendir (path);
+
+        if (!dir) {
+                /* If snaps dir doesn't exists ignore the error for
+                   backward compatibility */
+                if (errno != ENOENT) {
+                        ret = -1;
+                        gf_log ("", GF_LOG_ERROR, "Unable to open dir %s", path);
+                }
+                goto out;
+        }
+
+        glusterd_for_each_entry (entry, dir);
+
+        while (entry) {
+                if (entry->d_type == DT_DIR) {
+                        ret = glusterd_store_retrieve_snap (entry->d_name);
+                        if (ret) {
+                                gf_log (this->name, GF_LOG_ERROR,
+                                        "Unable to restore snapshot: %s",
+                                        entry->d_name);
+                                goto out;
+                        }
+                }
+
+                glusterd_for_each_entry (entry, dir);
+        }
+
+        /* Retrieve missed_snaps_list */
+        ret = glusterd_store_retrieve_missed_snaps_list (this);
+        if (ret) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "Failed to retrieve missed_snaps_list");
+                goto out;
+        }
+
+out:
+        if (dir)
+                closedir (dir);
+        gf_log ("", GF_LOG_DEBUG, "Returning with %d", ret);
+
+        return ret;
+}
+
+/* Writes all the contents of conf->missed_snap_list */
+int32_t
+glusterd_store_write_missed_snapinfo (int32_t fd)
+{
+        char                           value[PATH_MAX]             = "";
+        int32_t                        ret                         = -1;
+        glusterd_conf_t               *priv                        = NULL;
+        glusterd_missed_snap_info     *missed_snapinfo             = NULL;
+        glusterd_snap_op_t            *snap_opinfo                 = NULL;
+        xlator_t                      *this                        = NULL;
+
+        this = THIS;
+        GF_ASSERT(this);
+
+        priv = this->private;
+        GF_ASSERT (priv);
+
+        /* Write the missed_snap_entry */
+        list_for_each_entry (missed_snapinfo, &priv->missed_snaps_list,
+                             missed_snaps) {
+                list_for_each_entry (snap_opinfo,
+                                     &missed_snapinfo->snap_ops,
+                                     snap_ops_list) {
+                        snprintf (value, sizeof(value), "%d:%s:%d:%d",
+                                  snap_opinfo->brick_num,
+                                  snap_opinfo->brick_path,
+                                  snap_opinfo->op, snap_opinfo->status);
+                        ret = gf_store_save_value
+                                           (fd,
+                                            missed_snapinfo->node_snap_info,
+                                            value);
+                        if (ret) {
+                                gf_log (this->name, GF_LOG_ERROR,
+                                        "Failed to write missed snapinfo");
+                                goto out;
+                        }
+                }
+        }
+
+        ret = 0;
+out:
+        gf_log (this->name, GF_LOG_TRACE, "Returning %d", ret);
+        return ret;
+}
+
+/* Adds the missed snap entries to the in-memory conf->missed_snap_list *
+ * and writes them to disk */
+int32_t
+glusterd_store_update_missed_snaps (dict_t *dict, int32_t missed_snap_count)
+{
+        int32_t                        fd                          = -1;
+        int32_t                        ret                         = -1;
+        glusterd_conf_t               *priv                        = NULL;
+        xlator_t                      *this                        = NULL;
+
+        this = THIS;
+        GF_ASSERT(this);
+        GF_ASSERT(dict);
+
+        priv = this->private;
+        GF_ASSERT (priv);
+
+        if (missed_snap_count < 1) {
+                gf_log (this->name, GF_LOG_DEBUG, "No missed snaps");
+                ret = 0;
+                goto out;
+        }
+
+        ret = glusterd_store_create_missed_snaps_list_shandle_on_absence ();
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Unable to obtain "
+                        "missed_snaps_list store handle.");
+                goto out;
+        }
+
+        fd = gf_store_mkstemp (priv->missed_snaps_list_shandle);
+        if (fd <= 0) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Failed to create tmp file");
+                ret = -1;
+                goto out;
+        }
+
+        ret = glusterd_add_missed_snaps_to_list (dict, missed_snap_count);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Failed to add missed snaps to list");
+                goto out;
+        }
+
+        ret = glusterd_store_write_missed_snapinfo (fd);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Failed to write missed snaps to disk");
+                goto out;
+        }
+
+        ret = gf_store_rename_tmppath (priv->missed_snaps_list_shandle);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Failed to rename the tmp file");
+                goto out;
+        }
+out:
+        if (ret && (fd > 0)) {
+                ret = gf_store_unlink_tmppath (priv->missed_snaps_list_shandle);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Failed to unlink the tmp file");
+                }
+                ret = -1;
+        }
+
+        if (fd > 0)
+                close (fd);
+
+        gf_log (this->name, GF_LOG_TRACE, "Returning %d", ret);
+        return ret;
+}
+
+int32_t
 glusterd_store_delete_peerinfo (glusterd_peerinfo_t *peerinfo)
 {
         int32_t                         ret = -1;
@@ -2774,7 +3189,7 @@ glusterd_store_delete_peerinfo (glusterd_peerinfo_t *peerinfo)
 
 out:
         if (peerinfo->shandle) {
-                glusterd_store_handle_destroy (peerinfo->shandle);
+                gf_store_handle_destroy (peerinfo->shandle);
                 peerinfo->shandle = NULL;
         }
         gf_log ("", GF_LOG_DEBUG, "Returning with %d", ret);
@@ -2800,7 +3215,7 @@ glusterd_store_create_peer_dir ()
         char                            path[PATH_MAX];
 
         glusterd_store_peerinfo_dirpath_set (path, sizeof (path));
-        ret = glusterd_store_mkdir (path);
+        ret = gf_store_mkdir (path);
 
         gf_log ("", GF_LOG_DEBUG, "Returning with %d", ret);
         return ret;
@@ -2844,8 +3259,8 @@ glusterd_store_peerinfo_hostname_shandle_create (glusterd_peerinfo_t *peerinfo)
 
         glusterd_store_hostname_peerpath_set (peerinfo, peerfpath,
                                               sizeof (peerfpath));
-        ret = glusterd_store_handle_create_on_absence (&peerinfo->shandle,
-                                                       peerfpath);
+        ret = gf_store_handle_create_on_absence (&peerinfo->shandle,
+                                                 peerfpath);
         return ret;
 }
 
@@ -2857,8 +3272,8 @@ glusterd_store_peerinfo_uuid_shandle_create (glusterd_peerinfo_t *peerinfo)
 
         glusterd_store_uuid_peerpath_set (peerinfo, peerfpath,
                                           sizeof (peerfpath));
-        ret = glusterd_store_handle_create_on_absence (&peerinfo->shandle,
-                                                       peerfpath);
+        ret = gf_store_handle_create_on_absence (&peerinfo->shandle,
+                                                 peerfpath);
         return ret;
 }
 
@@ -2874,7 +3289,7 @@ glusterd_peerinfo_hostname_shandle_check_destroy (glusterd_peerinfo_t *peerinfo)
         ret = stat (peerfpath, &stbuf);
         if (!ret) {
                 if (peerinfo->shandle)
-                        glusterd_store_handle_destroy (peerinfo->shandle);
+                        gf_store_handle_destroy (peerinfo->shandle);
                 peerinfo->shandle = NULL;
                 ret = unlink (peerfpath);
         }
@@ -2903,18 +3318,18 @@ glusterd_store_peer_write (int fd, glusterd_peerinfo_t *peerinfo)
         char                    buf[50] = {0};
         int32_t                 ret = 0;
 
-        ret = glusterd_store_save_value (fd, GLUSTERD_STORE_KEY_PEER_UUID,
-                                         uuid_utoa (peerinfo->uuid));
+        ret = gf_store_save_value (fd, GLUSTERD_STORE_KEY_PEER_UUID,
+                                   uuid_utoa (peerinfo->uuid));
         if (ret)
                 goto out;
 
         snprintf (buf, sizeof (buf), "%d", peerinfo->state.state);
-        ret = glusterd_store_save_value (fd, GLUSTERD_STORE_KEY_PEER_STATE, buf);
+        ret = gf_store_save_value (fd, GLUSTERD_STORE_KEY_PEER_STATE, buf);
         if (ret)
                 goto out;
 
-        ret = glusterd_store_save_value (fd, GLUSTERD_STORE_KEY_PEER_HOSTNAME "1",
-                                         peerinfo->hostname);
+        ret = gf_store_save_value (fd, GLUSTERD_STORE_KEY_PEER_HOSTNAME "1",
+                                   peerinfo->hostname);
         if (ret)
                 goto out;
 
@@ -2931,7 +3346,7 @@ glusterd_store_perform_peer_store (glusterd_peerinfo_t *peerinfo)
 
         GF_ASSERT (peerinfo);
 
-        fd = glusterd_store_mkstemp (peerinfo->shandle);
+        fd = gf_store_mkstemp (peerinfo->shandle);
         if (fd <= 0) {
                 ret = -1;
                 goto out;
@@ -2941,10 +3356,10 @@ glusterd_store_perform_peer_store (glusterd_peerinfo_t *peerinfo)
         if (ret)
                 goto out;
 
-        ret = glusterd_store_rename_tmppath (peerinfo->shandle);
+        ret = gf_store_rename_tmppath (peerinfo->shandle);
 out:
         if (ret && (fd > 0))
-                glusterd_store_unlink_tmppath (peerinfo->shandle);
+                gf_store_unlink_tmppath (peerinfo->shandle);
         if (fd > 0)
                 close (fd);
         gf_log ("", GF_LOG_DEBUG, "Returning %d", ret);
@@ -2984,13 +3399,13 @@ glusterd_store_retrieve_peers (xlator_t *this)
         uuid_t                  uuid = {0,};
         char                    *hostname = NULL;
         int32_t                 state = 0;
-        glusterd_store_handle_t *shandle = NULL;
+        gf_store_handle_t       *shandle = NULL;
         char                    filepath[PATH_MAX] = {0,};
-        glusterd_store_iter_t   *iter = NULL;
+        gf_store_iter_t         *iter = NULL;
         char                    *key = NULL;
         char                    *value = NULL;
         glusterd_peerctx_args_t args = {0};
-        glusterd_store_op_errno_t op_errno = GD_STORE_SUCCESS;
+        gf_store_op_errno_t     op_errno = GD_STORE_SUCCESS;
 
         GF_ASSERT (this);
         priv = this->private;
@@ -3012,16 +3427,15 @@ glusterd_store_retrieve_peers (xlator_t *this)
 
         while (entry) {
                 snprintf (filepath, PATH_MAX, "%s/%s", path, entry->d_name);
-                ret = glusterd_store_handle_retrieve (filepath, &shandle);
+                ret = gf_store_handle_retrieve (filepath, &shandle);
                 if (ret)
                         goto out;
 
-                ret = glusterd_store_iter_new (shandle, &iter);
+                ret = gf_store_iter_new (shandle, &iter);
                 if (ret)
                         goto out;
 
-                ret = glusterd_store_iter_get_next (iter, &key, &value,
-                                                    &op_errno);
+                ret = gf_store_iter_get_next (iter, &key, &value, &op_errno);
                 if (ret)
                         goto out;
 
@@ -3049,13 +3463,13 @@ glusterd_store_retrieve_peers (xlator_t *this)
                         key = NULL;
                         value = NULL;
 
-                        ret = glusterd_store_iter_get_next (iter, &key, &value,
-                                                            &op_errno);
+                        ret = gf_store_iter_get_next (iter, &key, &value,
+                                                      &op_errno);
                 }
                 if (op_errno != GD_STORE_EOF)
                         goto out;
 
-                (void) glusterd_store_iter_destroy (iter);
+                (void) gf_store_iter_destroy (iter);
 
                 ret = glusterd_friend_add (hostname, 0, state, &uuid,
                                            &peerinfo, 1, NULL);
@@ -3128,7 +3542,11 @@ glusterd_restore ()
                 goto out;
         }
 
-        ret = glusterd_store_retrieve_volumes (this);
+        ret = glusterd_store_retrieve_volumes (this, NULL);
+        if (ret)
+                goto out;
+
+        ret = glusterd_store_retrieve_snaps (this);
         if (ret)
                 goto out;
 
diff --git a/xlators/mgmt/glusterd/src/glusterd-store.h b/xlators/mgmt/glusterd/src/glusterd-store.h
index 68977dd9c..1b5cebc0c 100644
--- a/xlators/mgmt/glusterd/src/glusterd-store.h
+++ b/xlators/mgmt/glusterd/src/glusterd-store.h
@@ -35,38 +35,55 @@ typedef enum glusterd_store_ver_ac_{
 } glusterd_volinfo_ver_ac_t;
 
 
-#define GLUSTERD_STORE_UUID_KEY           "UUID"
-
-#define GLUSTERD_STORE_KEY_VOL_TYPE       "type"
-#define GLUSTERD_STORE_KEY_VOL_COUNT      "count"
-#define GLUSTERD_STORE_KEY_VOL_STATUS     "status"
-#define GLUSTERD_STORE_KEY_VOL_PORT       "port"
-#define GLUSTERD_STORE_KEY_VOL_SUB_COUNT  "sub_count"
-#define GLUSTERD_STORE_KEY_VOL_STRIPE_CNT  "stripe_count"
-#define GLUSTERD_STORE_KEY_VOL_REPLICA_CNT "replica_count"
-#define GLUSTERD_STORE_KEY_VOL_BRICK      "brick"
-#define GLUSTERD_STORE_KEY_VOL_VERSION    "version"
-#define GLUSTERD_STORE_KEY_VOL_TRANSPORT  "transport-type"
-#define GLUSTERD_STORE_KEY_VOL_ID         "volume-id"
-#define GLUSTERD_STORE_KEY_RB_STATUS      "rb_status"
-#define GLUSTERD_STORE_KEY_RB_SRC_BRICK   "rb_src"
-#define GLUSTERD_STORE_KEY_RB_DST_BRICK   "rb_dst"
-#define GLUSTERD_STORE_KEY_RB_DST_PORT    "rb_port"
-#define GLUSTERD_STORE_KEY_VOL_DEFRAG     "rebalance_status"
-#define GLUSTERD_STORE_KEY_DEFRAG_OP      "rebalance_op"
-#define GLUSTERD_STORE_KEY_USERNAME       "username"
-#define GLUSTERD_STORE_KEY_PASSWORD       "password"
-
-#define GLUSTERD_STORE_KEY_BRICK_HOSTNAME "hostname"
-#define GLUSTERD_STORE_KEY_BRICK_PATH     "path"
-#define GLUSTERD_STORE_KEY_BRICK_PORT     "listen-port"
-#define GLUSTERD_STORE_KEY_BRICK_RDMA_PORT "rdma.listen-port"
+#define GLUSTERD_STORE_UUID_KEY                 "UUID"
+
+#define GLUSTERD_STORE_KEY_VOL_TYPE             "type"
+#define GLUSTERD_STORE_KEY_VOL_COUNT            "count"
+#define GLUSTERD_STORE_KEY_VOL_STATUS           "status"
+#define GLUSTERD_STORE_KEY_VOL_PORT             "port"
+#define GLUSTERD_STORE_KEY_VOL_SUB_COUNT        "sub_count"
+#define GLUSTERD_STORE_KEY_VOL_STRIPE_CNT       "stripe_count"
+#define GLUSTERD_STORE_KEY_VOL_REPLICA_CNT      "replica_count"
+#define GLUSTERD_STORE_KEY_VOL_BRICK            "brick"
+#define GLUSTERD_STORE_KEY_VOL_VERSION          "version"
+#define GLUSTERD_STORE_KEY_VOL_TRANSPORT        "transport-type"
+#define GLUSTERD_STORE_KEY_VOL_ID               "volume-id"
+#define GLUSTERD_STORE_KEY_VOL_IS_RESTORED      "is-volume-restored"
+#define GLUSTERD_STORE_KEY_RB_STATUS            "rb_status"
+#define GLUSTERD_STORE_KEY_RB_SRC_BRICK         "rb_src"
+#define GLUSTERD_STORE_KEY_RB_DST_BRICK         "rb_dst"
+#define GLUSTERD_STORE_KEY_RB_DST_PORT          "rb_port"
+#define GLUSTERD_STORE_KEY_VOL_DEFRAG           "rebalance_status"
+#define GLUSTERD_STORE_KEY_DEFRAG_OP            "rebalance_op"
+#define GLUSTERD_STORE_KEY_USERNAME             "username"
+#define GLUSTERD_STORE_KEY_PASSWORD             "password"
+#define GLUSTERD_STORE_KEY_PARENT_VOLNAME       "parent_volname"
+#define GLUSTERD_STORE_KEY_VOL_OP_VERSION       "op-version"
+#define GLUSTERD_STORE_KEY_VOL_CLIENT_OP_VERSION "client-op-version"
+
+#define GLUSTERD_STORE_KEY_SNAP_NAME            "name"
+#define GLUSTERD_STORE_KEY_SNAP_ID              "snap-id"
+#define GLUSTERD_STORE_KEY_SNAP_DESC            "desc"
+#define GLUSTERD_STORE_KEY_SNAP_TIMESTAMP       "time-stamp"
+#define GLUSTERD_STORE_KEY_SNAP_STATUS          "status"
+#define GLUSTERD_STORE_KEY_SNAP_RESTORED        "snap-restored"
+#define GLUSTERD_STORE_KEY_SNAP_MAX_HARD_LIMIT  "snap-max-hard-limit"
+#define GLUSTERD_STORE_KEY_SNAP_MAX_SOFT_LIMIT  "snap-max-soft-limit"
+
+#define GLUSTERD_STORE_KEY_BRICK_HOSTNAME       "hostname"
+#define GLUSTERD_STORE_KEY_BRICK_PATH           "path"
+#define GLUSTERD_STORE_KEY_BRICK_PORT           "listen-port"
+#define GLUSTERD_STORE_KEY_BRICK_RDMA_PORT      "rdma.listen-port"
 #define GLUSTERD_STORE_KEY_BRICK_DECOMMISSIONED "decommissioned"
+#define GLUSTERD_STORE_KEY_BRICK_VGNAME         "vg"
+#define GLUSTERD_STORE_KEY_BRICK_DEVICE_PATH    "device_path"
+#define GLUSTERD_STORE_KEY_BRICK_SNAP_STATUS    "snap-status"
 
-#define GLUSTERD_STORE_KEY_PEER_UUID      "uuid"
-#define GLUSTERD_STORE_KEY_PEER_HOSTNAME  "hostname"
-#define GLUSTERD_STORE_KEY_PEER_STATE     "state"
-#define GLUSTERD_STORE_KEY_VOL_BACKEND    "backend"
+#define GLUSTERD_STORE_KEY_PEER_UUID            "uuid"
+#define GLUSTERD_STORE_KEY_PEER_HOSTNAME        "hostname"
+#define GLUSTERD_STORE_KEY_PEER_STATE           "state"
+
+#define GLUSTERD_STORE_KEY_VOL_CAPS             "caps"
 
 #define glusterd_for_each_entry(entry, dir) \
         do {\
@@ -74,6 +91,7 @@ typedef enum glusterd_store_ver_ac_{
                 if (dir) {\
                         entry = readdir (dir);\
                         while (entry && (!strcmp (entry->d_name, ".") ||\
+                            !fnmatch ("*.tmp", entry->d_name, 0) ||\
                             !strcmp (entry->d_name, ".."))) {\
                                 entry = readdir (dir);\
                         }\
@@ -81,16 +99,6 @@ typedef enum glusterd_store_ver_ac_{
         } while (0); \
 
 
-typedef enum {
-        GD_STORE_SUCCESS,
-        GD_STORE_KEY_NULL,
-        GD_STORE_VALUE_NULL,
-        GD_STORE_KEY_VALUE_NULL,
-        GD_STORE_EOF,
-        GD_STORE_ENOMEM,
-        GD_STORE_STAT_FAILED
-} glusterd_store_op_errno_t;
-
 int32_t
 glusterd_store_volinfo (glusterd_volinfo_t *volinfo, glusterd_volinfo_ver_ac_t ac);
 
@@ -98,14 +106,7 @@ int32_t
 glusterd_store_delete_volume (glusterd_volinfo_t *volinfo);
 
 int32_t
-glusterd_store_handle_new (char *path, glusterd_store_handle_t **handle);
-
-int32_t
-glusterd_store_save_value (int fd, char *key, char *value);
-
-int32_t
-glusterd_store_retrieve_value (glusterd_store_handle_t *handle,
-                               char *key, char **value);
+glusterd_store_delete_snap (glusterd_snap_t *snap);
 
 int32_t
 glusterd_retrieve_uuid ();
@@ -117,11 +118,8 @@ int32_t
 glusterd_store_delete_peerinfo (glusterd_peerinfo_t *peerinfo);
 
 int32_t
-glusterd_store_delete_brick (glusterd_volinfo_t *volinfo,
-                             glusterd_brickinfo_t *brickinfo);
-
-int32_t
-glusterd_store_handle_destroy (glusterd_store_handle_t *handle);
+glusterd_store_delete_brick (glusterd_brickinfo_t *brickinfo,
+                             char *delete_path);
 
 int32_t
 glusterd_restore ();
@@ -145,5 +143,22 @@ int32_t
 glusterd_store_retrieve_options (xlator_t *this);
 
 int32_t
+glusterd_store_retrieve_bricks (glusterd_volinfo_t *volinfo);
+
+int32_t
 glusterd_store_options (xlator_t *this, dict_t *opts);
+
+void
+glusterd_replace_slash_with_hyphen (char *str);
+
+int32_t
+glusterd_store_perform_volume_store (glusterd_volinfo_t *volinfo);
+
+int32_t
+glusterd_store_snap (glusterd_snap_t *snap);
+
+int32_t
+glusterd_store_update_missed_snaps (dict_t *dict,
+                                    int32_t missed_snap_count);
+
 #endif
diff --git a/xlators/mgmt/glusterd/src/glusterd-syncop.c b/xlators/mgmt/glusterd/src/glusterd-syncop.c
index b943d8e94..438df8266 100644
--- a/xlators/mgmt/glusterd/src/glusterd-syncop.c
+++ b/xlators/mgmt/glusterd/src/glusterd-syncop.c
@@ -17,20 +17,152 @@
 #include "glusterd.h"
 #include "glusterd-op-sm.h"
 #include "glusterd-utils.h"
+#include "glusterd-locks.h"
+
+extern glusterd_op_info_t opinfo;
+
+void
+gd_synctask_barrier_wait (struct syncargs *args, int count)
+{
+        glusterd_conf_t *conf = THIS->private;
+
+        synclock_unlock (&conf->big_lock);
+        synctask_barrier_wait (args, count);
+        synclock_lock (&conf->big_lock);
+
+	syncbarrier_destroy (&args->barrier);
+}
 
 static void
-gd_collate_errors (struct syncargs *args, int op_ret, int op_errno,
-                   char *op_errstr)
+gd_mgmt_v3_collate_errors (struct syncargs *args, int op_ret, int op_errno,
+                           char *op_errstr, int op_code,
+                           glusterd_peerinfo_t *peerinfo, u_char *uuid)
 {
-        if (args->op_ret)
-                return;
-        args->op_ret = op_ret;
-        args->op_errno = op_errno;
-        if (op_ret && op_errstr && strcmp (op_errstr, ""))
-                args->errstr = gf_strdup (op_errstr);
+        char     err_str[PATH_MAX] = "Please check log file for details.";
+        char     op_err[PATH_MAX] = "";
+        int      len               = -1;
+        char    *peer_str      = NULL;
+
+        if (op_ret) {
+                args->op_ret = op_ret;
+                args->op_errno = op_errno;
+
+                if (peerinfo)
+                        peer_str = peerinfo->hostname;
+                else
+                        peer_str = uuid_utoa (uuid);
+
+                if (op_errstr && strcmp (op_errstr, "")) {
+                        len = snprintf (err_str, sizeof(err_str) - 1,
+                                        "Error: %s", op_errstr);
+                        err_str[len] = '\0';
+                }
+
+                switch (op_code){
+                        case GLUSTERD_MGMT_V3_LOCK:
+                        {
+                                len = snprintf (op_err, sizeof(op_err) - 1,
+                                                "Locking failed "
+                                                "on %s. %s", peer_str, err_str);
+                                break;
+                        }
+                        case GLUSTERD_MGMT_V3_UNLOCK:
+                        {
+                                len = snprintf (op_err, sizeof(op_err) - 1,
+                                                "Unlocking failed "
+                                                "on %s. %s", peer_str, err_str);
+                                break;
+                        }
+                }
+                op_err[len] = '\0';
+
+                if (args->errstr) {
+                        len = snprintf (err_str, sizeof(err_str) - 1,
+                                        "%s\n%s", args->errstr,
+                                        op_err);
+                        GF_FREE (args->errstr);
+                        args->errstr = NULL;
+                } else
+                        len = snprintf (err_str, sizeof(err_str) - 1,
+                                        "%s", op_err);
+                err_str[len] = '\0';
+
+                gf_log ("", GF_LOG_ERROR, "%s", op_err);
+                args->errstr = gf_strdup (err_str);
+        }
+
+        return;
 }
 
 static void
+gd_collate_errors (struct syncargs *args, int op_ret, int op_errno,
+                   char *op_errstr, int op_code,
+                   glusterd_peerinfo_t *peerinfo, u_char *uuid)
+{
+        char     err_str[PATH_MAX] = "Please check log file for details.";
+        char     op_err[PATH_MAX] = "";
+        int      len               = -1;
+        char    *peer_str      = NULL;
+
+        if (op_ret) {
+                args->op_ret = op_ret;
+                args->op_errno = op_errno;
+
+                if (peerinfo)
+                        peer_str = peerinfo->hostname;
+                else
+                        peer_str = uuid_utoa (uuid);
+
+                if (op_errstr && strcmp (op_errstr, "")) {
+                        len = snprintf (err_str, sizeof(err_str) - 1,
+                                        "Error: %s", op_errstr);
+                        err_str[len] = '\0';
+                }
+
+                switch (op_code){
+                        case GLUSTERD_MGMT_CLUSTER_UNLOCK :
+                        {
+                                len = snprintf (op_err, sizeof(op_err) - 1,
+                                                "Unlocking failed on %s. %s",
+                                                peer_str, err_str);
+                                break;
+                        }
+                        case GLUSTERD_MGMT_STAGE_OP :
+                        {
+                                len = snprintf (op_err, sizeof(op_err) - 1,
+                                                "Staging failed on %s. %s",
+                                                peer_str, err_str);
+                                break;
+                        }
+                        case GLUSTERD_MGMT_COMMIT_OP :
+                        {
+                                len = snprintf (op_err, sizeof(op_err) - 1,
+                                                "Commit failed on %s. %s",
+                                                peer_str, err_str);
+                                break;
+                        }
+                }
+                op_err[len] = '\0';
+
+                if (args->errstr) {
+                        len = snprintf (err_str, sizeof(err_str) - 1,
+                                        "%s\n%s", args->errstr,
+                                        op_err);
+                        GF_FREE (args->errstr);
+                        args->errstr = NULL;
+                } else
+                        len = snprintf (err_str, sizeof(err_str) - 1,
+                                        "%s", op_err);
+                err_str[len] = '\0';
+
+                gf_log ("", GF_LOG_ERROR, "%s", op_err);
+                args->errstr = gf_strdup (err_str);
+        }
+
+        return;
+}
+
+void
 gd_syncargs_init (struct syncargs *args, dict_t *op_ctx)
 {
         args->dict = op_ctx;
@@ -70,9 +202,9 @@ gd_brick_op_req_free (gd1_mgmt_brick_op_req *req)
 }
 
 int
-gd_syncop_submit_request (struct rpc_clnt *rpc, void *req,
-                          void *cookie, rpc_clnt_prog_t *prog,
-                          int procnum, fop_cbk_fn_t cbkfn, xdrproc_t xdrproc)
+gd_syncop_submit_request (struct rpc_clnt *rpc, void *req, void *local,
+                          void *cookie, rpc_clnt_prog_t *prog, int procnum,
+                          fop_cbk_fn_t cbkfn, xdrproc_t xdrproc)
 {
         int            ret      = -1;
         struct iobuf  *iobuf    = NULL;
@@ -112,7 +244,8 @@ gd_syncop_submit_request (struct rpc_clnt *rpc, void *req,
         iov.iov_len = ret;
         count = 1;
 
-        frame->local = cookie;
+        frame->local = local;
+        frame->cookie = cookie;
 
         /* Send the msg */
         ret = rpc_clnt_submit (rpc, prog, procnum, cbkfn,
@@ -131,8 +264,9 @@ out:
 /* Defined in glusterd-rpc-ops.c */
 extern struct rpc_clnt_program gd_mgmt_prog;
 extern struct rpc_clnt_program gd_brick_prog;
+extern struct rpc_clnt_program gd_mgmt_v3_prog;
 
-static int
+int
 glusterd_syncop_aggr_rsp_dict (glusterd_op_t op, dict_t *aggr, dict_t *rsp)
 {
         int ret = 0;
@@ -156,6 +290,9 @@ glusterd_syncop_aggr_rsp_dict (glusterd_op_t op, dict_t *aggr, dict_t *rsp)
                         goto out;
         break;
 
+        case GD_OP_GSYNC_CREATE:
+        break;
+
         case GD_OP_GSYNC_SET:
                 ret = glusterd_gsync_use_rsp_dict (aggr, rsp, NULL);
                 if (ret)
@@ -190,6 +327,18 @@ glusterd_syncop_aggr_rsp_dict (glusterd_op_t op, dict_t *aggr, dict_t *rsp)
 
         break;
 
+        case GD_OP_SYS_EXEC:
+                ret = glusterd_sys_exec_output_rsp_dict (aggr, rsp);
+                if (ret)
+                        goto out;
+        break;
+
+        case GD_OP_SNAP:
+                ret = glusterd_snap_use_rsp_dict (aggr, rsp);
+                if (ret)
+                        goto out;
+        break;
+
         default:
         break;
         }
@@ -198,20 +347,25 @@ out:
 }
 
 int32_t
-gd_syncop_mgmt_lock_cbk (struct rpc_req *req, struct iovec *iov,
-                         int count, void *myframe)
+_gd_syncop_mgmt_lock_cbk (struct rpc_req *req, struct iovec *iov,
+                          int count, void *myframe)
 {
         int                         ret         = -1;
         struct syncargs             *args       = NULL;
+        glusterd_peerinfo_t         *peerinfo   = NULL;
         gd1_mgmt_cluster_lock_rsp   rsp         = {{0},};
         call_frame_t                *frame      = NULL;
+        int                         op_ret      = -1;
+        int                         op_errno    = -1;
 
         frame  = myframe;
         args   = frame->local;
+        peerinfo = frame->cookie;
         frame->local = NULL;
+        frame->cookie = NULL;
 
         if (-1 == req->rpc_status) {
-                args->op_errno = ENOTCONN;
+                op_errno = ENOTCONN;
                 goto out;
         }
 
@@ -220,48 +374,244 @@ gd_syncop_mgmt_lock_cbk (struct rpc_req *req, struct iovec *iov,
         if (ret < 0)
                 goto out;
 
-        gd_collate_errors (args, rsp.op_ret, rsp.op_errno, NULL);
         uuid_copy (args->uuid, rsp.uuid);
 
+        /* Set peer as locked, so we unlock only the locked peers */
+        if (rsp.op_ret == 0)
+                peerinfo->locked = _gf_true;
+        op_ret = rsp.op_ret;
+        op_errno = rsp.op_errno;
 out:
+        gd_collate_errors (args, op_ret, op_errno, NULL,
+                           GLUSTERD_MGMT_CLUSTER_LOCK, peerinfo, rsp.uuid);
         STACK_DESTROY (frame->root);
         synctask_barrier_wake(args);
         return 0;
 }
 
+int32_t
+gd_syncop_mgmt_lock_cbk (struct rpc_req *req, struct iovec *iov, int count,
+                         void *myframe)
+{
+        return glusterd_big_locked_cbk (req, iov, count, myframe,
+                                        _gd_syncop_mgmt_lock_cbk);
+}
 
 int
-gd_syncop_mgmt_lock (struct rpc_clnt *rpc, struct syncargs *args,
+gd_syncop_mgmt_lock (glusterd_peerinfo_t *peerinfo, struct syncargs *args,
                      uuid_t my_uuid, uuid_t recv_uuid)
 {
         int                       ret = -1;
         gd1_mgmt_cluster_lock_req req  = {{0},};
+        glusterd_conf_t           *conf = THIS->private;
 
         uuid_copy (req.uuid, my_uuid);
-        ret = gd_syncop_submit_request (rpc, &req, args, &gd_mgmt_prog,
+        synclock_unlock (&conf->big_lock);
+        ret = gd_syncop_submit_request (peerinfo->rpc, &req, args, peerinfo,
+                                        &gd_mgmt_prog,
                                         GLUSTERD_MGMT_CLUSTER_LOCK,
                                         gd_syncop_mgmt_lock_cbk,
                                         (xdrproc_t) xdr_gd1_mgmt_cluster_lock_req);
+        synclock_lock (&conf->big_lock);
+        return ret;
+}
+
+int32_t
+gd_syncop_mgmt_v3_lock_cbk_fn (struct rpc_req *req, struct iovec *iov,
+                               int count, void *myframe)
+{
+        int                         ret         = -1;
+        struct syncargs             *args       = NULL;
+        glusterd_peerinfo_t         *peerinfo   = NULL;
+        gd1_mgmt_v3_lock_rsp         rsp        = {{0},};
+        call_frame_t                *frame      = NULL;
+        int                         op_ret      = -1;
+        int                         op_errno    = -1;
+
+        GF_ASSERT(req);
+        GF_ASSERT(iov);
+        GF_ASSERT(myframe);
+
+        frame  = myframe;
+        args   = frame->local;
+        peerinfo = frame->cookie;
+        frame->local = NULL;
+        frame->cookie = NULL;
+
+        if (-1 == req->rpc_status) {
+                op_errno = ENOTCONN;
+                goto out;
+        }
+
+        ret = xdr_to_generic (*iov, &rsp,
+                              (xdrproc_t)xdr_gd1_mgmt_v3_lock_rsp);
+        if (ret < 0)
+                goto out;
+
+        uuid_copy (args->uuid, rsp.uuid);
+
+        op_ret = rsp.op_ret;
+        op_errno = rsp.op_errno;
+out:
+        gd_mgmt_v3_collate_errors (args, op_ret, op_errno, NULL,
+                                   GLUSTERD_MGMT_V3_LOCK,
+                                   peerinfo, rsp.uuid);
+        STACK_DESTROY (frame->root);
+        synctask_barrier_wake(args);
+        return 0;
+}
+
+int32_t
+gd_syncop_mgmt_v3_lock_cbk (struct rpc_req *req, struct iovec *iov,
+                            int count, void *myframe)
+{
+        return glusterd_big_locked_cbk (req, iov, count, myframe,
+                                        gd_syncop_mgmt_v3_lock_cbk_fn);
+}
+
+int
+gd_syncop_mgmt_v3_lock (glusterd_op_t op, dict_t *op_ctx,
+                        glusterd_peerinfo_t *peerinfo,
+                        struct syncargs *args, uuid_t my_uuid,
+                        uuid_t recv_uuid, uuid_t txn_id)
+{
+        int                      ret  = -1;
+        gd1_mgmt_v3_lock_req     req  = {{0},};
+        glusterd_conf_t         *conf = THIS->private;
+
+        GF_ASSERT(op_ctx);
+        GF_ASSERT(peerinfo);
+        GF_ASSERT(args);
+
+        ret = dict_allocate_and_serialize (op_ctx,
+                                           &req.dict.dict_val,
+                                           &req.dict.dict_len);
         if (ret)
-                synctask_barrier_wake(args);
+                goto out;
+
+        uuid_copy (req.uuid, my_uuid);
+        uuid_copy (req.txn_id, txn_id);
+        req.op = op;
+        synclock_unlock (&conf->big_lock);
+        ret = gd_syncop_submit_request (peerinfo->rpc, &req, args, peerinfo,
+                                        &gd_mgmt_v3_prog,
+                                        GLUSTERD_MGMT_V3_LOCK,
+                                        gd_syncop_mgmt_v3_lock_cbk,
+                                        (xdrproc_t) xdr_gd1_mgmt_v3_lock_req);
+        synclock_lock (&conf->big_lock);
+out:
+        gf_log ("", GF_LOG_DEBUG, "Returning %d", ret);
         return ret;
 }
 
 int32_t
-gd_syncop_mgmt_unlock_cbk (struct rpc_req *req, struct iovec *iov,
-                           int count, void *myframe)
+gd_syncop_mgmt_v3_unlock_cbk_fn (struct rpc_req *req, struct iovec *iov,
+                                 int count, void *myframe)
+{
+        int                         ret         = -1;
+        struct syncargs             *args       = NULL;
+        glusterd_peerinfo_t         *peerinfo   = NULL;
+        gd1_mgmt_v3_unlock_rsp       rsp        = {{0},};
+        call_frame_t                *frame      = NULL;
+        int                         op_ret      = -1;
+        int                         op_errno    = -1;
+
+        GF_ASSERT(req);
+        GF_ASSERT(iov);
+        GF_ASSERT(myframe);
+
+        frame  = myframe;
+        args   = frame->local;
+        peerinfo = frame->cookie;
+        frame->local = NULL;
+        frame->cookie = NULL;
+
+        if (-1 == req->rpc_status) {
+                op_errno = ENOTCONN;
+                goto out;
+        }
+
+        ret = xdr_to_generic (*iov, &rsp,
+                              (xdrproc_t)xdr_gd1_mgmt_v3_unlock_rsp);
+        if (ret < 0)
+                goto out;
+
+        uuid_copy (args->uuid, rsp.uuid);
+
+        /* Set peer as locked, so we unlock only the locked peers */
+        if (rsp.op_ret == 0)
+                peerinfo->locked = _gf_true;
+        op_ret = rsp.op_ret;
+        op_errno = rsp.op_errno;
+out:
+        gd_mgmt_v3_collate_errors (args, op_ret, op_errno, NULL,
+                                   GLUSTERD_MGMT_V3_UNLOCK,
+                                   peerinfo, rsp.uuid);
+        STACK_DESTROY (frame->root);
+        synctask_barrier_wake(args);
+        return 0;
+}
+
+int32_t
+gd_syncop_mgmt_v3_unlock_cbk (struct rpc_req *req, struct iovec *iov,
+                              int count, void *myframe)
+{
+        return glusterd_big_locked_cbk (req, iov, count, myframe,
+                                        gd_syncop_mgmt_v3_unlock_cbk_fn);
+}
+
+int
+gd_syncop_mgmt_v3_unlock (dict_t *op_ctx, glusterd_peerinfo_t *peerinfo,
+                          struct syncargs *args, uuid_t my_uuid,
+                          uuid_t recv_uuid, uuid_t txn_id)
+{
+        int                          ret  = -1;
+        gd1_mgmt_v3_unlock_req       req  = {{0},};
+        glusterd_conf_t             *conf = THIS->private;
+
+        GF_ASSERT(op_ctx);
+        GF_ASSERT(peerinfo);
+        GF_ASSERT(args);
+
+        ret = dict_allocate_and_serialize (op_ctx,
+                                           &req.dict.dict_val,
+                                           &req.dict.dict_len);
+        if (ret)
+                goto out;
+
+        uuid_copy (req.uuid, my_uuid);
+        uuid_copy (req.txn_id, txn_id);
+        synclock_unlock (&conf->big_lock);
+        ret = gd_syncop_submit_request (peerinfo->rpc, &req, args, peerinfo,
+                                        &gd_mgmt_v3_prog,
+                                        GLUSTERD_MGMT_V3_UNLOCK,
+                                        gd_syncop_mgmt_v3_unlock_cbk,
+                                        (xdrproc_t) xdr_gd1_mgmt_v3_unlock_req);
+        synclock_lock (&conf->big_lock);
+out:
+        gf_log ("", GF_LOG_DEBUG, "Returning %d", ret);
+        return ret;
+}
+
+int32_t
+_gd_syncop_mgmt_unlock_cbk (struct rpc_req *req, struct iovec *iov,
+                            int count, void *myframe)
 {
         int                         ret         = -1;
         struct syncargs             *args       = NULL;
+        glusterd_peerinfo_t         *peerinfo   = NULL;
         gd1_mgmt_cluster_unlock_rsp rsp         = {{0},};
         call_frame_t                *frame      = NULL;
+        int                         op_ret      = -1;
+        int                         op_errno    = -1;
 
         frame = myframe;
         args  = frame->local;
+        peerinfo = frame->cookie;
         frame->local = NULL;
 
         if (-1 == req->rpc_status) {
-                args->op_errno = ENOTCONN;
+                op_errno = ENOTCONN;
                 goto out;
         }
 
@@ -270,36 +620,50 @@ gd_syncop_mgmt_unlock_cbk (struct rpc_req *req, struct iovec *iov,
         if (ret < 0)
                 goto out;
 
-        gd_collate_errors (args, rsp.op_ret, rsp.op_errno, NULL);
         uuid_copy (args->uuid, rsp.uuid);
 
+        peerinfo->locked = _gf_false;
+        op_ret = rsp.op_ret;
+        op_errno = rsp.op_errno;
 out:
+        gd_collate_errors (args, op_ret, op_errno, NULL,
+                           GLUSTERD_MGMT_CLUSTER_UNLOCK, peerinfo, rsp.uuid);
         STACK_DESTROY (frame->root);
         synctask_barrier_wake(args);
         return 0;
 }
 
+int32_t
+gd_syncop_mgmt_unlock_cbk (struct rpc_req *req, struct iovec *iov,
+                           int count, void *myframe)
+{
+        return glusterd_big_locked_cbk (req, iov, count, myframe,
+                                        _gd_syncop_mgmt_unlock_cbk);
+}
+
 
 int
-gd_syncop_mgmt_unlock (struct rpc_clnt *rpc, struct syncargs *args,
+gd_syncop_mgmt_unlock (glusterd_peerinfo_t *peerinfo, struct syncargs *args,
                        uuid_t my_uuid, uuid_t recv_uuid)
 {
         int                         ret     = -1;
         gd1_mgmt_cluster_unlock_req req     = {{0},};
+        glusterd_conf_t             *conf   = THIS->private;
 
         uuid_copy (req.uuid, my_uuid);
-        ret = gd_syncop_submit_request (rpc, &req, args, &gd_mgmt_prog,
+        synclock_unlock (&conf->big_lock);
+        ret = gd_syncop_submit_request (peerinfo->rpc, &req, args, peerinfo,
+                                        &gd_mgmt_prog,
                                         GLUSTERD_MGMT_CLUSTER_UNLOCK,
                                         gd_syncop_mgmt_unlock_cbk,
                                         (xdrproc_t) xdr_gd1_mgmt_cluster_lock_req);
-        if (ret)
-                synctask_barrier_wake(args);
+        synclock_lock (&conf->big_lock);
         return ret;
 }
 
 int32_t
-gd_syncop_stage_op_cbk (struct rpc_req *req, struct iovec *iov,
-                        int count, void *myframe)
+_gd_syncop_stage_op_cbk (struct rpc_req *req, struct iovec *iov,
+                         int count, void *myframe)
 {
         int                         ret         = -1;
         gd1_mgmt_stage_op_rsp       rsp         = {{0},};
@@ -307,6 +671,9 @@ gd_syncop_stage_op_cbk (struct rpc_req *req, struct iovec *iov,
         xlator_t                    *this       = NULL;
         dict_t                      *rsp_dict   = NULL;
         call_frame_t                *frame      = NULL;
+        glusterd_peerinfo_t         *peerinfo   = NULL;
+        int                         op_ret      = -1;
+        int                         op_errno    = -1;
 
         this  = THIS;
         frame = myframe;
@@ -314,8 +681,7 @@ gd_syncop_stage_op_cbk (struct rpc_req *req, struct iovec *iov,
         frame->local = NULL;
 
         if (-1 == req->rpc_status) {
-                args->op_ret   = -1;
-                args->op_errno = ENOTCONN;
+                op_errno = ENOTCONN;
                 goto out;
         }
 
@@ -339,7 +705,15 @@ gd_syncop_stage_op_cbk (struct rpc_req *req, struct iovec *iov,
                 }
         }
 
-        gd_collate_errors (args, rsp.op_ret, rsp.op_errno, rsp.op_errstr);
+        ret = glusterd_friend_find (rsp.uuid, NULL, &peerinfo);
+        if (ret) {
+                gf_log (this->name, GF_LOG_CRITICAL, "Staging response "
+                        "for 'Volume %s' received from unknown "
+                        "peer: %s", gd_op_list[rsp.op],
+                        uuid_utoa (rsp.uuid));
+                goto out;
+        }
+
         uuid_copy (args->uuid, rsp.uuid);
         if (rsp.op == GD_OP_REPLACE_BRICK) {
                 pthread_mutex_lock (&args->lock_dict);
@@ -354,7 +728,13 @@ gd_syncop_stage_op_cbk (struct rpc_req *req, struct iovec *iov,
                 pthread_mutex_unlock (&args->lock_dict);
         }
 
+        op_ret = rsp.op_ret;
+        op_errno = rsp.op_errno;
+
 out:
+        gd_collate_errors (args, op_ret, op_errno, rsp.op_errstr,
+                           GLUSTERD_MGMT_STAGE_OP, peerinfo, rsp.uuid);
+
         if (rsp_dict)
                 dict_unref (rsp_dict);
 
@@ -363,6 +743,14 @@ out:
         return 0;
 }
 
+int32_t
+gd_syncop_stage_op_cbk (struct rpc_req *req, struct iovec *iov,
+                        int count, void *myframe)
+{
+        return glusterd_big_locked_cbk (req, iov, count, myframe,
+                                        _gd_syncop_stage_op_cbk);
+}
+
 
 int
 gd_syncop_mgmt_stage_op (struct rpc_clnt *rpc, struct syncargs *args,
@@ -370,7 +758,8 @@ gd_syncop_mgmt_stage_op (struct rpc_clnt *rpc, struct syncargs *args,
                          dict_t *dict_out, dict_t *op_ctx)
 {
         gd1_mgmt_stage_op_req *req  = NULL;
-        int                   ret  = -1;
+        glusterd_conf_t       *conf = THIS->private;
+        int                   ret   = -1;
 
         req = GF_CALLOC (1, sizeof (*req), gf_gld_mt_mop_stage_req_t);
         if (!req)
@@ -384,21 +773,20 @@ gd_syncop_mgmt_stage_op (struct rpc_clnt *rpc, struct syncargs *args,
         if (ret)
                 goto out;
 
-        ret = gd_syncop_submit_request (rpc, req, args, &gd_mgmt_prog,
+        synclock_unlock (&conf->big_lock);
+        ret = gd_syncop_submit_request (rpc, req, args, NULL, &gd_mgmt_prog,
                                         GLUSTERD_MGMT_STAGE_OP,
                                         gd_syncop_stage_op_cbk,
                                         (xdrproc_t) xdr_gd1_mgmt_stage_op_req);
+        synclock_lock (&conf->big_lock);
 out:
         gd_stage_op_req_free (req);
-        if (ret)
-                synctask_barrier_wake(args);
-
         return ret;
 
 }
 
 int32_t
-gd_syncop_brick_op_cbk (struct rpc_req *req, struct iovec *iov,
+_gd_syncop_brick_op_cbk (struct rpc_req *req, struct iovec *iov,
                         int count, void *myframe)
 {
         struct syncargs        *args  = NULL;
@@ -444,7 +832,7 @@ gd_syncop_brick_op_cbk (struct rpc_req *req, struct iovec *iov,
         args->errstr = gf_strdup (rsp.op_errstr);
 
 out:
-        if (strcmp (rsp.op_errstr, "") != 0)
+        if ((rsp.op_errstr) && (strcmp (rsp.op_errstr, "") != 0))
                 free (rsp.op_errstr);
         free (rsp.output.output_val);
 
@@ -454,6 +842,14 @@ out:
         return 0;
 }
 
+int32_t
+gd_syncop_brick_op_cbk (struct rpc_req *req, struct iovec *iov,
+                        int count, void *myframe)
+{
+        return glusterd_big_locked_cbk (req, iov, count, myframe,
+                                        _gd_syncop_brick_op_cbk);
+}
+
 int
 gd_syncop_mgmt_brick_op (struct rpc_clnt *rpc, glusterd_pending_node_t *pnode,
                          int op, dict_t *dict_out, dict_t *op_ctx,
@@ -483,14 +879,15 @@ gd_syncop_mgmt_brick_op (struct rpc_clnt *rpc, glusterd_pending_node_t *pnode,
         if (ret)
                 goto out;
 
-        GD_SYNCOP (rpc, (&args), gd_syncop_brick_op_cbk,
-                   req, &gd_brick_prog, req->op,
-                   xdr_gd1_mgmt_brick_op_req);
+        GD_SYNCOP (rpc, (&args), NULL, gd_syncop_brick_op_cbk, req,
+                   &gd_brick_prog, req->op, xdr_gd1_mgmt_brick_op_req);
 
-        if (args.errstr && errstr)
-                *errstr = args.errstr;
-        else
-                GF_FREE (args.errstr);
+        if (args.errstr) {
+                if ((strlen(args.errstr) > 0) && errstr)
+                        *errstr = args.errstr;
+                else
+                        GF_FREE (args.errstr);
+        }
 
         if (GD_OP_STATUS_VOLUME == op) {
                 ret = dict_set_int32 (args.dict, "index", pnode->index);
@@ -517,15 +914,18 @@ out:
 }
 
 int32_t
-gd_syncop_commit_op_cbk (struct rpc_req *req, struct iovec *iov,
-                         int count, void *myframe)
+_gd_syncop_commit_op_cbk (struct rpc_req *req, struct iovec *iov,
+                          int count, void *myframe)
 {
-        int                         ret         = -1;
-        gd1_mgmt_commit_op_rsp      rsp         = {{0},};
-        struct syncargs             *args       = NULL;
-        xlator_t                    *this       = NULL;
-        dict_t                      *rsp_dict   = NULL;
-        call_frame_t                *frame      = NULL;
+        int                          ret           = -1;
+        gd1_mgmt_commit_op_rsp       rsp           = {{0},};
+        struct syncargs             *args          = NULL;
+        xlator_t                    *this          = NULL;
+        dict_t                      *rsp_dict      = NULL;
+        call_frame_t                *frame         = NULL;
+        glusterd_peerinfo_t         *peerinfo      = NULL;
+        int                          op_ret        = -1;
+        int                          op_errno      = -1;
 
         this  = THIS;
         frame = myframe;
@@ -533,7 +933,7 @@ gd_syncop_commit_op_cbk (struct rpc_req *req, struct iovec *iov,
         frame->local = NULL;
 
         if (-1 == req->rpc_status) {
-                args->op_errno = ENOTCONN;
+                op_errno = ENOTCONN;
                 goto out;
         }
 
@@ -558,7 +958,15 @@ gd_syncop_commit_op_cbk (struct rpc_req *req, struct iovec *iov,
                 }
         }
 
-        gd_collate_errors (args, rsp.op_ret, rsp.op_errno, rsp.op_errstr);
+        ret = glusterd_friend_find (rsp.uuid, NULL, &peerinfo);
+        if (ret) {
+                gf_log (this->name, GF_LOG_CRITICAL, "Commit response "
+                        "for 'Volume %s' received from unknown "
+                        "peer: %s", gd_op_list[rsp.op],
+                        uuid_utoa (rsp.uuid));
+                goto out;
+        }
+
         uuid_copy (args->uuid, rsp.uuid);
         pthread_mutex_lock (&args->lock_dict);
         {
@@ -570,7 +978,13 @@ gd_syncop_commit_op_cbk (struct rpc_req *req, struct iovec *iov,
                                 " node/brick");
         }
         pthread_mutex_unlock (&args->lock_dict);
+
+        op_ret = rsp.op_ret;
+        op_errno = rsp.op_errno;
+
 out:
+        gd_collate_errors (args, op_ret, op_errno, rsp.op_errstr,
+                           GLUSTERD_MGMT_COMMIT_OP, peerinfo, rsp.uuid);
         if (rsp_dict)
                 dict_unref (rsp_dict);
 
@@ -580,12 +994,21 @@ out:
         return 0;
 }
 
+int32_t
+gd_syncop_commit_op_cbk (struct rpc_req *req, struct iovec *iov,
+                         int count, void *myframe)
+{
+        return glusterd_big_locked_cbk (req, iov, count, myframe,
+                                        _gd_syncop_commit_op_cbk);
+}
+
 
 int
 gd_syncop_mgmt_commit_op (struct rpc_clnt *rpc, struct syncargs *args,
                           uuid_t my_uuid, uuid_t recv_uuid,
                           int op, dict_t *dict_out, dict_t *op_ctx)
 {
+        glusterd_conf_t        *conf = THIS->private;
         gd1_mgmt_commit_op_req *req  = NULL;
         int                    ret  = -1;
 
@@ -601,21 +1024,21 @@ gd_syncop_mgmt_commit_op (struct rpc_clnt *rpc, struct syncargs *args,
         if (ret)
                 goto out;
 
-        ret = gd_syncop_submit_request (rpc, req, args, &gd_mgmt_prog,
+        synclock_unlock (&conf->big_lock);
+        ret = gd_syncop_submit_request (rpc, req, args, NULL, &gd_mgmt_prog,
                                         GLUSTERD_MGMT_COMMIT_OP ,
                                         gd_syncop_commit_op_cbk,
                                         (xdrproc_t) xdr_gd1_mgmt_commit_op_req);
+        synclock_lock (&conf->big_lock);
 out:
         gd_commit_op_req_free (req);
-        if (ret)
-                synctask_barrier_wake(args);
-
         return ret;
 }
 
 
 int
-gd_build_peers_list (struct list_head *peers, struct list_head *xact_peers)
+gd_build_peers_list (struct list_head *peers, struct list_head *xact_peers,
+                     glusterd_op_t op)
 {
         glusterd_peerinfo_t *peerinfo = NULL;
         int                 npeers      = 0;
@@ -623,7 +1046,8 @@ gd_build_peers_list (struct list_head *peers, struct list_head *xact_peers)
         list_for_each_entry (peerinfo, peers, uuid_list) {
                 if (!peerinfo->connected)
                         continue;
-                if (peerinfo->state.state != GD_FRIEND_STATE_BEFRIENDED)
+                if (op != GD_OP_SYNC_VOLUME &&
+                    peerinfo->state.state != GD_FRIEND_STATE_BEFRIENDED)
                         continue;
 
                 list_add_tail (&peerinfo->op_peers_list, xact_peers);
@@ -633,8 +1057,8 @@ gd_build_peers_list (struct list_head *peers, struct list_head *xact_peers)
 }
 
 int
-gd_lock_op_phase (struct list_head *peers, glusterd_op_t op, dict_t *op_ctx,
-                  char **op_errstr, int npeers)
+gd_lock_op_phase (glusterd_conf_t  *conf, glusterd_op_t op, dict_t *op_ctx,
+                  char **op_errstr, int npeers, uuid_t txn_id)
 {
         int                 ret         = -1;
         int                 peer_cnt    = 0;
@@ -642,6 +1066,9 @@ gd_lock_op_phase (struct list_head *peers, glusterd_op_t op, dict_t *op_ctx,
         xlator_t            *this       = NULL;
         glusterd_peerinfo_t *peerinfo   = NULL;
         struct syncargs     args        = {0};
+        struct list_head   *peers       = NULL;
+
+        peers = &conf->xaction_peers;
 
         if (!npeers) {
                 ret = 0;
@@ -652,20 +1079,38 @@ gd_lock_op_phase (struct list_head *peers, glusterd_op_t op, dict_t *op_ctx,
         synctask_barrier_init((&args));
         peer_cnt = 0;
         list_for_each_entry (peerinfo, peers, op_peers_list) {
-                gd_syncop_mgmt_lock (peerinfo->rpc, &args, MY_UUID, peer_uuid);
+                if (conf->op_version < 3) {
+                        /* Reset lock status */
+                        peerinfo->locked = _gf_false;
+                        gd_syncop_mgmt_lock (peerinfo, &args,
+                                             MY_UUID, peer_uuid);
+                } else
+                        gd_syncop_mgmt_v3_lock (op, op_ctx, peerinfo, &args,
+                                                MY_UUID, peer_uuid, txn_id);
                 peer_cnt++;
         }
-        synctask_barrier_wait((&args), peer_cnt);
-        ret = args.op_ret;
-        if (ret) {
-                gf_asprintf (op_errstr, "Another transaction could be "
-                             "in progress. Please try again after "
-                             "sometime.");
-                gf_log (this->name, GF_LOG_ERROR, "Failed to acquire lock");
-                goto out;
+        gd_synctask_barrier_wait((&args), peer_cnt);
+
+        if (args.op_ret) {
+                if (args.errstr)
+                         *op_errstr = gf_strdup (args.errstr);
+                else {
+                        ret = gf_asprintf (op_errstr, "Another transaction could be "
+                                           "in progress. Please try again after "
+                                           "sometime.");
+                        if (ret == -1)
+                                *op_errstr = NULL;
+
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Failed to acquire lock");
+
+                }
         }
 
-        ret = 0;
+        ret = args.op_ret;
+
+        gf_log (this->name, GF_LOG_DEBUG, "Sent lock op req for 'Volume %s' "
+                "to %d peers. Returning %d", gd_op_list[op], peer_cnt, ret);
 out:
         return ret;
 }
@@ -730,11 +1175,17 @@ stage_done:
                                                op, req_dict, op_ctx);
                 peer_cnt++;
         }
-        synctask_barrier_wait((&args), peer_cnt);
-        ret = args.op_ret;
-        if (dict_get_str (op_ctx, "errstr", &errstr) == 0)
+        gd_synctask_barrier_wait((&args), peer_cnt);
+
+        if (args.errstr)
+                 *op_errstr = gf_strdup (args.errstr);
+        else if (dict_get_str (op_ctx, "errstr", &errstr) == 0)
                 *op_errstr = gf_strdup (errstr);
 
+        ret = args.op_ret;
+
+        gf_log (this->name, GF_LOG_DEBUG, "Sent stage op req for 'Volume %s' "
+                "to %d peers", gd_op_list[op], peer_cnt);
 out:
         if (rsp_dict)
                 dict_unref (rsp_dict);
@@ -767,12 +1218,14 @@ gd_commit_op_phase (struct list_head *peers, glusterd_op_t op, dict_t *op_ctx,
                 hostname = "localhost";
                 goto commit_done;
         }
-        ret =  glusterd_syncop_aggr_rsp_dict (op, op_ctx, rsp_dict);
-        if (ret) {
-                gf_log (this->name, GF_LOG_ERROR, "%s",
-                        "Failed to aggregate response "
-                        "from node/brick");
-                goto out;
+        if (op != GD_OP_SYNC_VOLUME) {
+                ret =  glusterd_syncop_aggr_rsp_dict (op, op_ctx, rsp_dict);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR, "%s",
+                                "Failed to aggregate response "
+                                "from node/brick");
+                        goto out;
+                }
         }
         dict_unref (rsp_dict);
         rsp_dict = NULL;
@@ -786,14 +1239,13 @@ commit_done:
                         gf_asprintf (op_errstr, OPERRSTR_COMMIT_FAIL,
                                      hostname);
                 goto out;
-         } else {
-                 glusterd_op_modify_op_ctx (op, op_ctx);
-         }
+        }
 
         if (!npeers) {
                 ret = 0;
                 goto out;
         }
+
         gd_syncargs_init (&args, op_ctx);
         synctask_barrier_init((&args));
         peer_cnt = 0;
@@ -803,21 +1255,33 @@ commit_done:
                                                 op, req_dict, op_ctx);
                 peer_cnt++;
         }
-        synctask_barrier_wait((&args), peer_cnt);
+        gd_synctask_barrier_wait((&args), peer_cnt);
         ret = args.op_ret;
-        if (dict_get_str (op_ctx, "errstr", &errstr) == 0)
+        if (args.errstr)
+                 *op_errstr = gf_strdup (args.errstr);
+        else if (dict_get_str (op_ctx, "errstr", &errstr) == 0)
                 *op_errstr = gf_strdup (errstr);
 
+        gf_log (this->name, GF_LOG_DEBUG, "Sent commit op req for 'Volume %s' "
+                "to %d peers", gd_op_list[op], peer_cnt);
 out:
+        if (!ret)
+                glusterd_op_modify_op_ctx (op, op_ctx);
+
         if (rsp_dict)
                 dict_unref (rsp_dict);
+
+        GF_FREE (args.errstr);
+        args.errstr = NULL;
+
         return ret;
 }
 
 int
-gd_unlock_op_phase (struct list_head *peers, glusterd_op_t op, int op_ret,
+gd_unlock_op_phase (glusterd_conf_t  *conf, glusterd_op_t op, int op_ret,
                     rpcsvc_request_t *req, dict_t *op_ctx, char *op_errstr,
-                    int npeers)
+                    int npeers, char *volname, gf_boolean_t is_acquired,
+                    uuid_t txn_id)
 {
         glusterd_peerinfo_t *peerinfo   = NULL;
         glusterd_peerinfo_t *tmp        = NULL;
@@ -826,21 +1290,37 @@ gd_unlock_op_phase (struct list_head *peers, glusterd_op_t op, int op_ret,
         int                 ret         = -1;
         xlator_t            *this       = NULL;
         struct syncargs     args        = {0};
+        struct list_head   *peers       = NULL;
+
+        peers = &conf->xaction_peers;
 
         if (!npeers) {
                 ret = 0;
                 goto out;
         }
 
+        /* If the lock has not been held during this
+         * transaction, do not send unlock requests */
+        if (!is_acquired)
+                goto out;
+
         this = THIS;
         synctask_barrier_init((&args));
         peer_cnt = 0;
         list_for_each_entry_safe (peerinfo, tmp, peers, op_peers_list) {
-                gd_syncop_mgmt_unlock (peerinfo->rpc, &args, MY_UUID, tmp_uuid);
-                list_del_init (&peerinfo->op_peers_list);
+                if (conf->op_version < 3) {
+                        /* Only unlock peers that were locked */
+                        if (peerinfo->locked)
+                                gd_syncop_mgmt_unlock (peerinfo, &args,
+                                                       MY_UUID, tmp_uuid);
+                } else
+                        gd_syncop_mgmt_v3_unlock (op_ctx, peerinfo,
+                                                  &args, MY_UUID,
+                                                  tmp_uuid, txn_id);
                 peer_cnt++;
+                list_del_init (&peerinfo->op_peers_list);
         }
-        synctask_barrier_wait((&args), peer_cnt);
+        gd_synctask_barrier_wait((&args), peer_cnt);
         ret = args.op_ret;
         if (ret) {
                 gf_log (this->name, GF_LOG_ERROR, "Failed to unlock "
@@ -850,7 +1330,20 @@ gd_unlock_op_phase (struct list_head *peers, glusterd_op_t op, int op_ret,
 out:
         glusterd_op_send_cli_response (op, op_ret, 0, req, op_ctx, op_errstr);
         glusterd_op_clear_op (op);
-        glusterd_unlock (MY_UUID);
+        if (is_acquired) {
+                /* Based on the op-version, we release *
+                 * the cluster or mgmt_v3 lock */
+                if (conf->op_version < 3)
+                        glusterd_unlock (MY_UUID);
+                else {
+                        ret = glusterd_mgmt_v3_unlock (volname, MY_UUID,
+                                                       "vol");
+                        if (ret)
+                                gf_log (this->name, GF_LOG_ERROR,
+                                        "Unable to release lock for %s",
+                                        volname);
+                }
+        }
 
         return 0;
 }
@@ -867,7 +1360,8 @@ gd_get_brick_count (struct list_head *bricks)
 }
 
 int
-gd_brick_op_phase (glusterd_op_t op, dict_t *op_ctx, dict_t *req_dict, char **op_errstr)
+gd_brick_op_phase (glusterd_op_t op, dict_t *op_ctx, dict_t *req_dict,
+                   char **op_errstr)
 {
         glusterd_pending_node_t *pending_node = NULL;
         struct list_head        selected = {0,};
@@ -876,8 +1370,10 @@ gd_brick_op_phase (glusterd_op_t op, dict_t *op_ctx, dict_t *req_dict, char **op
         int                     ret = -1;
         rpc_clnt_t              *rpc = NULL;
         dict_t                  *rsp_dict = NULL;
+        glusterd_conf_t         *conf = NULL;
 
         this = THIS;
+        conf = this->private;
         rsp_dict = dict_new ();
         if (!rsp_dict) {
                 ret = -1;
@@ -893,9 +1389,11 @@ gd_brick_op_phase (glusterd_op_t op, dict_t *op_ctx, dict_t *req_dict, char **op
                 goto out;
         }
 
-        ret = glusterd_syncop_aggr_rsp_dict (op, op_ctx, rsp_dict);
-        if (ret)
-                goto out;
+        if (op == GD_OP_HEAL_VOLUME) {
+                ret = glusterd_syncop_aggr_rsp_dict (op, op_ctx, rsp_dict);
+                if (ret)
+                        goto out;
+        }
         dict_unref (rsp_dict);
         rsp_dict = NULL;
 
@@ -935,20 +1433,63 @@ out:
 void
 gd_sync_task_begin (dict_t *op_ctx, rpcsvc_request_t * req)
 {
-        int                         ret             = -1;
-        int                         npeers          = 0;
-        dict_t                      *req_dict       = NULL;
-        glusterd_conf_t             *conf           = NULL;
-        glusterd_op_t               op              = 0;
-        int32_t                     tmp_op          = 0;
-        char                        *op_errstr      = NULL;
-        xlator_t                    *this           = NULL;
+        int                         ret              = -1;
+        int                         npeers           = 0;
+        dict_t                      *req_dict        = NULL;
+        glusterd_conf_t             *conf            = NULL;
+        glusterd_op_t               op               = 0;
+        int32_t                     tmp_op           = 0;
+        char                        *op_errstr       = NULL;
+        char                        *tmp             = NULL;
+        char                        *volname         = NULL;
+        xlator_t                    *this            = NULL;
+        gf_boolean_t                is_acquired      = _gf_false;
+        uuid_t                      *txn_id          = NULL;
+        uuid_t                      *originator_uuid = NULL;
+        glusterd_op_info_t          txn_opinfo;
 
         this = THIS;
         GF_ASSERT (this);
         conf = this->private;
         GF_ASSERT (conf);
 
+        /* Generate a transaction-id for this operation and
+         * save it in the dict */
+        txn_id = GF_CALLOC (1, sizeof(uuid_t), gf_common_mt_uuid_t);
+        if (!txn_id) {
+                ret = -1;
+                goto out;
+        }
+
+        uuid_generate (*txn_id);
+
+        ret = dict_set_bin (op_ctx, "transaction_id",
+                            txn_id, sizeof(*txn_id));
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Failed to set transaction id.");
+                goto out;
+        } else
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "Transaction_id = %s", uuid_utoa (*txn_id));
+
+        /* Save the MY_UUID as the originator_uuid */
+        originator_uuid = GF_CALLOC (1, sizeof(uuid_t),
+                                     gf_common_mt_uuid_t);
+        if (!originator_uuid) {
+                ret = -1;
+                goto out;
+        }
+
+        uuid_copy (*originator_uuid, MY_UUID);
+        ret = dict_set_bin (op_ctx, "originator_uuid",
+                            originator_uuid, sizeof (uuid_t));
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Failed to set originator_uuid.");
+                goto out;
+        }
+
         ret = dict_get_int32 (op_ctx, GD_SYNC_OPCODE_KEY, &tmp_op);
         if (ret) {
                 gf_log (this->name, GF_LOG_ERROR, "Failed to get volume "
@@ -957,24 +1498,77 @@ gd_sync_task_begin (dict_t *op_ctx, rpcsvc_request_t * req)
         }
 
         op = tmp_op;
-        ret = glusterd_lock (MY_UUID);
-        if (ret) {
-                gf_log (this->name, GF_LOG_ERROR, "Unable to acquire lock");
-                gf_asprintf (&op_errstr, "Another transaction is in progress. "
-                             "Please try again after sometime.");
-                goto out;
+
+        /* Based on the op_version, acquire a cluster or mgmt_v3 lock */
+        if (conf->op_version < 3) {
+                ret = glusterd_lock (MY_UUID);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Unable to acquire lock");
+                        gf_asprintf (&op_errstr,
+                                     "Another transaction is in progress. "
+                                     "Please try again after sometime.");
+                        goto out;
+                }
+        } else {
+
+                /* If no volname is given as a part of the command, locks will
+                 * not be held */
+                ret = dict_get_str (op_ctx, "volname", &tmp);
+                if (ret) {
+                        gf_log ("", GF_LOG_DEBUG, "Failed to get volume "
+                                "name");
+                        goto local_locking_done;
+                } else {
+                        /* Use a copy of volname, as cli response will be
+                         * sent before the unlock, and the volname in the
+                         * dict, might be removed */
+                        volname = gf_strdup (tmp);
+                        if (!volname)
+                                goto out;
+                }
+
+                ret = glusterd_mgmt_v3_lock (volname, MY_UUID, "vol");
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Unable to acquire lock for %s", volname);
+                        gf_asprintf (&op_errstr,
+                                     "Another transaction is in progress "
+                                     "for %s. Please try again after sometime.",
+                                     volname);
+                        goto out;
+                }
         }
 
-        /* storing op globally to access in synctask code paths
-         * This is still acceptable, as we are performing this under
-         * the 'cluster' lock*/
-        glusterd_op_set_op  (op);
-        INIT_LIST_HEAD (&conf->xaction_peers);
-        npeers = gd_build_peers_list  (&conf->peers, &conf->xaction_peers);
+        is_acquired = _gf_true;
+
+local_locking_done:
 
-        ret = gd_lock_op_phase (&conf->xaction_peers, op, op_ctx, &op_errstr, npeers);
+        /* Save opinfo for this transaction with the transaction id */
+        glusterd_txn_opinfo_init (&txn_opinfo, NULL, &op, NULL, NULL);
+        ret = glusterd_set_txn_opinfo (txn_id, &txn_opinfo);
         if (ret)
-                goto out;
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Unable to set transaction's opinfo");
+
+        opinfo = txn_opinfo;
+
+        INIT_LIST_HEAD (&conf->xaction_peers);
+
+        /* Make 'volume status tasks' command a local operation.
+         * This is accomplished by setting npeers to 0.
+         */
+        if (!glusterd_is_status_tasks_op (op, op_ctx))
+                npeers = gd_build_peers_list  (&conf->peers,
+                                               &conf->xaction_peers, op);
+
+        /* If no volname is given as a part of the command, locks will
+         * not be held */
+        if (volname) {
+                ret = gd_lock_op_phase (conf, op, op_ctx, &op_errstr, npeers, *txn_id);
+                if (ret)
+                        goto out;
+        }
 
         ret = glusterd_op_build_payload (&req_dict, &op_errstr, op_ctx);
         if (ret) {
@@ -1001,14 +1595,25 @@ gd_sync_task_begin (dict_t *op_ctx, rpcsvc_request_t * req)
 
         ret = 0;
 out:
-        (void) gd_unlock_op_phase (&conf->xaction_peers, op, ret, req,
-                                   op_ctx, op_errstr, npeers);
+        (void) gd_unlock_op_phase (conf, op, ret, req, op_ctx, op_errstr,
+                                   npeers, volname, is_acquired, *txn_id);
+
+        /* Clearing the transaction opinfo */
+        ret = glusterd_clear_txn_opinfo (txn_id);
+        if (ret)
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Unable to clear transaction's opinfo");
+
+        if (volname)
+                GF_FREE (volname);
 
         if (req_dict)
                 dict_unref (req_dict);
 
-        if (op_errstr)
+        if (op_errstr) {
                 GF_FREE (op_errstr);
+                op_errstr = NULL;
+        }
 
         return;
 }
diff --git a/xlators/mgmt/glusterd/src/glusterd-syncop.h b/xlators/mgmt/glusterd/src/glusterd-syncop.h
index 658ed4e2a..e83ea2f4c 100644
--- a/xlators/mgmt/glusterd/src/glusterd-syncop.h
+++ b/xlators/mgmt/glusterd/src/glusterd-syncop.h
@@ -11,33 +11,40 @@
 #define __RPC_SYNCOP_H
 
 #include "syncop.h"
+#include "glusterd-sm.h"
+#include "glusterd.h"
 
 #define GD_SYNC_OPCODE_KEY "sync-mgmt-operation"
 
 /* gd_syncop_* */
-#define GD_SYNCOP(rpc, stb, cbk, req, prog, procnum, xdrproc) do {      \
-                int ret = 0;                                            \
-                struct  synctask        *task = NULL;                   \
-                task = synctask_get ();                                 \
-                stb->task = task;                                       \
-                                                                        \
-                ret = gd_syncop_submit_request (rpc, req, stb,          \
-                                                prog, procnum, cbk,     \
-                                                (xdrproc_t)xdrproc);    \
-                if (!ret)                                               \
-                        synctask_yield (stb->task);                     \
+#define GD_SYNCOP(rpc, stb, cookie, cbk, req, prog, procnum, xdrproc) do {     \
+                int ret = 0;                                                   \
+                struct  synctask        *task = NULL;                          \
+                glusterd_conf_t         *conf= THIS->private;                  \
+                                                                               \
+                task = synctask_get ();                                        \
+                stb->task = task;                                              \
+                                                                               \
+                /*This is to ensure that the brick_op_cbk is able to           \
+                 * take the big lock*/                                         \
+                synclock_unlock (&conf->big_lock);                             \
+                ret = gd_syncop_submit_request (rpc, req, stb, cookie,         \
+                                                prog, procnum, cbk,            \
+                                                (xdrproc_t)xdrproc);           \
+                if (!ret)                                                      \
+                        synctask_yield (stb->task);                            \
+                synclock_lock (&conf->big_lock);                               \
         } while (0)
 
 
-int gd_syncop_submit_request (struct rpc_clnt *rpc, void *req,
-                               void *cookie, rpc_clnt_prog_t *prog,
-                               int procnum, fop_cbk_fn_t cbkfn,
-                               xdrproc_t xdrproc);
+int gd_syncop_submit_request (struct rpc_clnt *rpc, void *req, void *local,
+                              void *cookie, rpc_clnt_prog_t *prog, int procnum,
+                              fop_cbk_fn_t cbkfn, xdrproc_t xdrproc);
 
 
-int gd_syncop_mgmt_lock (struct rpc_clnt *rpc, struct syncargs *arg,
+int gd_syncop_mgmt_lock (glusterd_peerinfo_t *peerinfo, struct syncargs *arg,
                          uuid_t my_uuid, uuid_t recv_uuid);
-int gd_syncop_mgmt_unlock (struct rpc_clnt *rpc, struct syncargs *arg,
+int gd_syncop_mgmt_unlock (glusterd_peerinfo_t *peerinfo, struct syncargs *arg,
                            uuid_t my_uuid, uuid_t recv_uuid);
 int gd_syncop_mgmt_stage_op (struct rpc_clnt *rpc, struct syncargs *arg,
                              uuid_t my_uuid, uuid_t recv_uuid, int op,
@@ -45,4 +52,20 @@ int gd_syncop_mgmt_stage_op (struct rpc_clnt *rpc, struct syncargs *arg,
 int gd_syncop_mgmt_commit_op (struct rpc_clnt *rpc, struct syncargs *arg,
                               uuid_t my_uuid, uuid_t recv_uuid, int op,
                               dict_t *dict_out, dict_t *op_ctx);
+
+void
+gd_synctask_barrier_wait (struct syncargs *args, int count);
+
+int
+gd_build_peers_list (struct list_head *peers, struct list_head *xact_peers,
+                     glusterd_op_t op);
+int
+gd_brick_op_phase (glusterd_op_t op, dict_t *op_ctx, dict_t *req_dict,
+                   char **op_errstr);
+
+int
+glusterd_syncop_aggr_rsp_dict (glusterd_op_t op, dict_t *aggr, dict_t *rsp);
+
+void
+gd_syncargs_init (struct syncargs *args, dict_t *op_ctx);
 #endif /* __RPC_SYNCOP_H */
diff --git a/xlators/mgmt/glusterd/src/glusterd-utils.c b/xlators/mgmt/glusterd/src/glusterd-utils.c
index e151b2f71..e8ae05851 100644
--- a/xlators/mgmt/glusterd/src/glusterd-utils.c
+++ b/xlators/mgmt/glusterd/src/glusterd-utils.c
@@ -11,7 +11,6 @@
 #define _CONFIG_H
 #include "config.h"
 #endif
-#include <openssl/md5.h>
 #include <inttypes.h>
 
 #include "globals.h"
@@ -23,6 +22,7 @@
 #include "timer.h"
 #include "defaults.h"
 #include "compat.h"
+#include "syncop.h"
 #include "run.h"
 #include "compat-errno.h"
 #include "statedump.h"
@@ -35,6 +35,8 @@
 #include "glusterd-store.h"
 #include "glusterd-volgen.h"
 #include "glusterd-pmap.h"
+#include "glusterfs-acl.h"
+#include "glusterd-locks.h"
 
 #include "xdr-generic.h"
 #include <sys/resource.h>
@@ -49,6 +51,10 @@
 #include <fnmatch.h>
 #include <sys/statvfs.h>
 #include <ifaddrs.h>
+#ifdef HAVE_BD_XLATOR
+#include <lvm2app.h>
+#endif
+
 
 #ifdef GF_LINUX_HOST_OS
 #include <mntent.h>
@@ -73,17 +79,19 @@
 
 static glusterd_lock_t lock;
 
-static void
-md5_wrapper(const unsigned char *data, size_t len, char *md5)
+char*
+gd_peer_uuid_str (glusterd_peerinfo_t *peerinfo)
 {
-        unsigned short i = 0;
-        unsigned short lim = MD5_DIGEST_LENGTH*2+1;
-        unsigned char scratch[MD5_DIGEST_LENGTH] = {0,};
-        MD5(data, len, scratch);
-        for (; i < MD5_DIGEST_LENGTH; i++)
-                snprintf(md5 + i * 2, lim-i*2, "%02x", scratch[i]);
+        if ((peerinfo == NULL) || uuid_is_null (peerinfo->uuid))
+                return NULL;
+
+        if (peerinfo->uuid_str[0] == '\0')
+                uuid_utoa_r (peerinfo->uuid, peerinfo->uuid_str);
+
+        return peerinfo->uuid_str;
 }
 
+
 int32_t
 glusterd_get_lock_owner (uuid_t *uuid)
 {
@@ -121,189 +129,6 @@ glusterd_is_fuse_available ()
                 return _gf_false;
 }
 
-gf_boolean_t
-glusterd_is_loopback_localhost (const struct sockaddr *sa, char *hostname)
-{
-        GF_ASSERT (sa);
-
-        gf_boolean_t is_local = _gf_false;
-        const struct in_addr *addr4 = NULL;
-        const struct in6_addr *addr6 = NULL;
-        uint8_t      *ap   = NULL;
-        struct in6_addr loopbackaddr6 = IN6ADDR_LOOPBACK_INIT;
-
-        switch (sa->sa_family) {
-                case AF_INET:
-                        addr4 = &(((struct sockaddr_in *)sa)->sin_addr);
-                        ap = (uint8_t*)&addr4->s_addr;
-                        if (ap[0] == 127)
-                                is_local = _gf_true;
-                        break;
-
-                case AF_INET6:
-                        addr6 = &(((struct sockaddr_in6 *)sa)->sin6_addr);
-                        if (memcmp (addr6, &loopbackaddr6,
-                                    sizeof (loopbackaddr6)) == 0)
-                                is_local = _gf_true;
-                        break;
-
-                default:
-                        if (hostname)
-                                gf_log ("glusterd", GF_LOG_ERROR,
-                                        "unknown address family %d for %s",
-                                        sa->sa_family, hostname);
-                        break;
-        }
-
-        return is_local;
-}
-
-char *
-get_ip_from_addrinfo (struct addrinfo *addr, char **ip)
-{
-        char buf[64];
-        void *in_addr = NULL;
-        struct sockaddr_in *s4 = NULL;
-        struct sockaddr_in6 *s6 = NULL;
-
-        switch (addr->ai_family)
-        {
-                case AF_INET:
-                        s4 = (struct sockaddr_in *)addr->ai_addr;
-                        in_addr = &s4->sin_addr;
-                        break;
-
-                case AF_INET6:
-                        s6 = (struct sockaddr_in6 *)addr->ai_addr;
-                        in_addr = &s6->sin6_addr;
-                        break;
-
-                default:
-                        gf_log ("glusterd", GF_LOG_ERROR, "Invalid family");
-                        return NULL;
-        }
-
-        if (!inet_ntop(addr->ai_family, in_addr, buf, sizeof(buf))) {
-                gf_log ("glusterd", GF_LOG_ERROR, "String conversion failed");
-                return NULL;
-        }
-
-        *ip = strdup (buf);
-        return *ip;
-}
-
-gf_boolean_t
-glusterd_interface_search (char *ip)
-{
-        int32_t         ret = -1;
-        gf_boolean_t    found = _gf_false;
-        struct          ifaddrs *ifaddr, *ifa;
-        int             family;
-        char            host[NI_MAXHOST];
-        xlator_t        *this = NULL;
-        char            *pct = NULL;
-
-        this = THIS;
-
-        ret = getifaddrs (&ifaddr);
-
-        if (ret != 0) {
-                gf_log (this->name, GF_LOG_ERROR, "getifaddrs() failed: %s\n",
-                        gai_strerror(ret));
-                goto out;
-        }
-
-        for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
-                if (!ifa->ifa_addr) {
-                        /*
-                         * This seemingly happens if an interface hasn't
-                         * been bound to a particular protocol (seen with
-                         * TUN devices).
-                         */
-                        continue;
-                }
-                family = ifa->ifa_addr->sa_family;
-
-                if (family != AF_INET && family != AF_INET6)
-                        continue;
-
-                ret = getnameinfo (ifa->ifa_addr,
-                        (family == AF_INET) ? sizeof(struct sockaddr_in) :
-                                              sizeof(struct sockaddr_in6),
-                        host, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
-
-                if (ret != 0) {
-                        gf_log (this->name, GF_LOG_ERROR,
-                                "getnameinfo() failed: %s\n",
-                                gai_strerror(ret));
-                        goto out;
-                }
-
-                /*
-                 * Sometimes the address comes back as addr%eth0 or
-                 * similar.  Since % is an invalid character, we can
-                 * strip it out with confidence that doing so won't
-                 * harm anything.
-                 */
-                pct = index(host,'%');
-                if (pct) {
-                        *pct = '\0';
-                }
-
-                if (strncmp (ip, host, NI_MAXHOST) == 0) {
-                        gf_log (this->name, GF_LOG_DEBUG,
-                                "%s is local address at interface %s",
-                                ip, ifa->ifa_name);
-                        found = _gf_true;
-                        goto out;
-                }
-        }
-out:
-        if(ifaddr)
-                freeifaddrs (ifaddr);
-        return found;
-}
-
-
-gf_boolean_t
-glusterd_is_local_addr (char *hostname)
-{
-        int32_t         ret = -1;
-        struct          addrinfo *result = NULL;
-        struct          addrinfo *res = NULL;
-        gf_boolean_t    found = _gf_false;
-        char            *ip = NULL;
-        xlator_t        *this = NULL;
-
-        this = THIS;
-        ret = getaddrinfo (hostname, NULL, NULL, &result);
-
-        if (ret != 0) {
-                gf_log (this->name, GF_LOG_ERROR, "error in getaddrinfo: %s\n",
-                        gai_strerror(ret));
-                goto out;
-        }
-
-        for (res = result; res != NULL; res = res->ai_next) {
-                gf_log (this->name, GF_LOG_DEBUG, "%s ",
-                        get_ip_from_addrinfo (res, &ip));
-
-                found = glusterd_is_loopback_localhost (res->ai_addr, hostname)
-                        || glusterd_interface_search (ip);
-                if (found)
-                        goto out;
-        }
-
-out:
-        if (result)
-                freeaddrinfo (result);
-
-        if (!found)
-                gf_log (this->name, GF_LOG_DEBUG, "%s is not local", hostname);
-
-        return found;
-}
-
 int32_t
 glusterd_lock (uuid_t   uuid)
 {
@@ -611,8 +436,11 @@ glusterd_volinfo_new (glusterd_volinfo_t **volinfo)
         if (!new_volinfo)
                 goto out;
 
+        LOCK_INIT (&new_volinfo->lock);
         INIT_LIST_HEAD (&new_volinfo->vol_list);
+        INIT_LIST_HEAD (&new_volinfo->snapvol_list);
         INIT_LIST_HEAD (&new_volinfo->bricks);
+        INIT_LIST_HEAD (&new_volinfo->snap_volumes);
 
         new_volinfo->dict = dict_new ();
         if (!new_volinfo->dict) {
@@ -628,6 +456,10 @@ glusterd_volinfo_new (glusterd_volinfo_t **volinfo)
                 goto out;
         }
 
+        snprintf (new_volinfo->parent_volname, GLUSTERD_MAX_VOLUME_NAME, "N/A");
+
+        new_volinfo->snap_max_hard_limit = GLUSTERD_SNAPS_MAX_HARD_LIMIT;
+
         new_volinfo->xl = THIS;
 
         *volinfo = new_volinfo;
@@ -639,6 +471,219 @@ out:
         return ret;
 }
 
+/* This function will create a new volinfo and then
+ * dup the entries from volinfo to the new_volinfo.
+ *
+ * @param volinfo       volinfo which will be duplicated
+ * @param dup_volinfo   new volinfo which will be created
+ * @param set_userauth  if this true then auth info is also set
+ *
+ * @return 0 on success else -1
+ */
+int32_t
+glusterd_volinfo_dup (glusterd_volinfo_t *volinfo,
+                      glusterd_volinfo_t **dup_volinfo,
+                      gf_boolean_t set_userauth)
+{
+        int32_t                 ret             = -1;
+        xlator_t                *this           = NULL;
+        glusterd_volinfo_t      *new_volinfo    = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_VALIDATE_OR_GOTO (this->name, volinfo, out);
+        GF_VALIDATE_OR_GOTO (this->name, dup_volinfo, out);
+
+        ret = glusterd_volinfo_new (&new_volinfo);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "not able to create the "
+                        "duplicate volinfo for the volume %s",
+                        volinfo->volname);
+                goto out;
+        }
+
+        new_volinfo->type = volinfo->type;
+        new_volinfo->replica_count = volinfo->replica_count;
+        new_volinfo->stripe_count = volinfo->stripe_count;
+        new_volinfo->dist_leaf_count = volinfo->dist_leaf_count;
+        new_volinfo->sub_count = volinfo->sub_count;
+        new_volinfo->transport_type = volinfo->transport_type;
+        new_volinfo->nfs_transport_type = volinfo->nfs_transport_type;
+        new_volinfo->brick_count = volinfo->brick_count;
+
+        dict_copy (volinfo->dict, new_volinfo->dict);
+        gd_update_volume_op_versions (new_volinfo);
+
+        if (set_userauth) {
+                glusterd_auth_set_username (new_volinfo,
+                                            volinfo->auth.username);
+                glusterd_auth_set_password (new_volinfo,
+                                            volinfo->auth.password);
+        }
+
+        *dup_volinfo = new_volinfo;
+        ret = 0;
+out:
+        if (ret && (NULL != new_volinfo)) {
+                (void) glusterd_volinfo_delete (new_volinfo);
+        }
+        return ret;
+}
+
+/* This function will duplicate brickinfo
+ *
+ * @param brickinfo     Source brickinfo
+ * @param dup_brickinfo Destination brickinfo
+ *
+ * @return 0 on success else -1
+ */
+int32_t
+glusterd_brickinfo_dup (glusterd_brickinfo_t *brickinfo,
+                        glusterd_brickinfo_t *dup_brickinfo)
+{
+        int32_t         ret     = -1;
+        xlator_t        *this   = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+
+        GF_VALIDATE_OR_GOTO (this->name, brickinfo, out);
+        GF_VALIDATE_OR_GOTO (this->name, dup_brickinfo, out);
+
+        strcpy (dup_brickinfo->hostname, brickinfo->hostname);
+        strcpy (dup_brickinfo->path, brickinfo->path);
+        strcpy (dup_brickinfo->device_path, brickinfo->device_path);
+        ret = gf_canonicalize_path (dup_brickinfo->path);
+        if (ret) {
+                gf_log (THIS->name, GF_LOG_ERROR, "Failed to canonicalize "
+                        "brick path");
+                goto out;
+        }
+        uuid_copy (dup_brickinfo->uuid, brickinfo->uuid);
+
+        dup_brickinfo->port = brickinfo->port;
+        dup_brickinfo->rdma_port = brickinfo->rdma_port;
+        if (NULL != brickinfo->logfile) {
+                dup_brickinfo->logfile = gf_strdup (brickinfo->logfile);
+                if (NULL == dup_brickinfo->logfile) {
+                        ret = -1;
+                        goto out;
+                }
+        }
+        dup_brickinfo->status = brickinfo->status;
+        dup_brickinfo->snap_status = brickinfo->snap_status;
+out:
+        return ret;
+}
+
+/* This function will copy snap volinfo to the new
+ * passed volinfo and regenerate backend store files
+ * for the restored snap.
+ *
+ * @param new_volinfo   new volinfo
+ * @param snap_volinfo  volinfo of snap volume
+ *
+ * @return 0 on success and -1 on failure
+ *
+ * TODO: Duplicate all members of volinfo, e.g. geo-rep sync slaves
+ */
+int32_t
+glusterd_snap_volinfo_restore (dict_t *rsp_dict,
+                               glusterd_volinfo_t *new_volinfo,
+                               glusterd_volinfo_t *snap_volinfo)
+{
+        int32_t                 brick_count     = -1;
+        int32_t                 ret             = -1;
+        xlator_t                *this           = NULL;
+        glusterd_brickinfo_t    *brickinfo      = NULL;
+        glusterd_brickinfo_t    *new_brickinfo  = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (rsp_dict);
+
+        GF_VALIDATE_OR_GOTO (this->name, new_volinfo, out);
+        GF_VALIDATE_OR_GOTO (this->name, snap_volinfo, out);
+
+        brick_count = 0;
+        list_for_each_entry (brickinfo, &snap_volinfo->bricks, brick_list) {
+                ret = glusterd_brickinfo_new (&new_brickinfo);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR, "Failed to create "
+                                "new brickinfo");
+                        goto out;
+                }
+
+                /* Duplicate brickinfo */
+                ret = glusterd_brickinfo_dup (brickinfo, new_brickinfo);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR, "Failed to dup "
+                                "brickinfo");
+                        goto out;
+                }
+
+                /* If the brick is not of this peer, or snapshot is missed *
+                 * for the brick do not replace the xattr for it */
+                if ((!uuid_compare (brickinfo->uuid, MY_UUID)) &&
+                    (brickinfo->snap_status != -1)) {
+                        /* We need to replace the volume id of all the bricks
+                         * to the volume id of the origin volume. new_volinfo
+                         * has the origin volume's volume id*/
+                        ret = sys_lsetxattr (new_brickinfo->path,
+                                             GF_XATTR_VOL_ID_KEY,
+                                             new_volinfo->volume_id,
+                                             sizeof (new_volinfo->volume_id),
+                                             XATTR_REPLACE);
+                        if (ret) {
+                                gf_log (this->name, GF_LOG_ERROR, "Failed to "
+                                        "set extended attribute %s on %s. "
+                                        "Reason: %s, snap: %s",
+                                        GF_XATTR_VOL_ID_KEY,
+                                        new_brickinfo->path, strerror (errno),
+                                        new_volinfo->volname);
+                                goto out;
+                        }
+                }
+
+                /* If a snapshot is pending for this brick then
+                 * restore should also be pending
+                 */
+                if (brickinfo->snap_status == -1) {
+                        /* Adding missed delete to the dict */
+                        ret = glusterd_add_missed_snaps_to_dict
+                                                (rsp_dict,
+                                                 snap_volinfo->volname,
+                                                 brickinfo,
+                                                 brick_count + 1,
+                                                 GF_SNAP_OPTION_TYPE_RESTORE);
+                        if (ret) {
+                                gf_log (this->name, GF_LOG_ERROR,
+                                        "Failed to add missed snapshot info "
+                                        "for %s:%s in the rsp_dict",
+                                        brickinfo->hostname,
+                                        brickinfo->path);
+                                goto out;
+                        }
+                }
+
+                list_add_tail (&new_brickinfo->brick_list,
+                                &new_volinfo->bricks);
+                /* ownership of new_brickinfo is passed to new_volinfo */
+                new_brickinfo = NULL;
+                brick_count++;
+        }
+
+        /* Regenerate all volfiles */
+        ret = glusterd_create_volfiles_and_notify_services (new_volinfo);
+
+out:
+        if (ret && (NULL != new_brickinfo)) {
+                (void) glusterd_brickinfo_delete (new_brickinfo);
+        }
+
+        return ret;
+}
+
 void
 glusterd_auth_cleanup (glusterd_volinfo_t *volinfo) {
 
@@ -731,6 +776,7 @@ glusterd_volinfo_delete (glusterd_volinfo_t *volinfo)
         GF_ASSERT (volinfo);
 
         list_del_init (&volinfo->vol_list);
+        list_del_init (&volinfo->snapvol_list);
 
         ret = glusterd_volume_brickinfos_delete (volinfo);
         if (ret)
@@ -751,7 +797,6 @@ out:
         return ret;
 }
 
-
 int32_t
 glusterd_brickinfo_new (glusterd_brickinfo_t **brickinfo)
 {
@@ -803,6 +848,7 @@ glusterd_brickinfo_new_from_brick (char *brick,
         char                    *path = NULL;
         char                    *tmp_host = NULL;
         char                    *tmp_path = NULL;
+        char                    *vg       = NULL;
 
         GF_ASSERT (brick);
         GF_ASSERT (brickinfo);
@@ -821,6 +867,17 @@ glusterd_brickinfo_new_from_brick (char *brick,
         if (ret)
                 goto out;
 
+#ifdef HAVE_BD_XLATOR
+        vg = strchr (path, '?');
+        /* ? is used as a delimiter for vg */
+        if (vg) {
+                strncpy (new_brickinfo->vg, vg + 1, PATH_MAX - 1);
+                *vg = '\0';
+        }
+        new_brickinfo->caps = CAPS_BD;
+#else
+        vg = NULL; /* Avoid compiler warnings when BD not enabled */
+#endif
         ret = gf_canonicalize_path (path);
         if (ret)
                 goto out;
@@ -924,6 +981,169 @@ out:
         return available;
 }
 
+#ifdef HAVE_BD_XLATOR
+/*
+ * Sets the tag of the format "trusted.glusterfs.volume-id:<uuid>" in
+ * the brick VG. It is used to avoid using same VG for another brick.
+ * @volume-id - gfid, @brick - brick info, @msg - Error message returned
+ * to the caller
+ */
+int
+glusterd_bd_set_vg_tag (unsigned char *volume_id, glusterd_brickinfo_t *brick,
+                        char *msg, int msg_size)
+{
+        lvm_t        handle    = NULL;
+        vg_t         vg        = NULL;
+        char        *uuid      = NULL;
+        int          ret       = -1;
+
+        gf_asprintf (&uuid, "%s:%s", GF_XATTR_VOL_ID_KEY,
+                     uuid_utoa (volume_id));
+        if (!uuid) {
+                snprintf (msg, sizeof(*msg), "Could not allocate memory "
+                          "for tag");
+                return -1;
+        }
+
+        handle = lvm_init (NULL);
+        if (!handle) {
+                snprintf (msg, sizeof(*msg), "lvm_init failed");
+                goto out;
+        }
+
+        vg = lvm_vg_open (handle, brick->vg, "w", 0);
+        if (!vg) {
+                snprintf (msg, sizeof(*msg), "Could not open VG %s",
+                          brick->vg);
+                goto out;
+        }
+
+        if (lvm_vg_add_tag (vg, uuid) < 0) {
+                snprintf (msg, sizeof(*msg), "Could not set tag %s for "
+                          "VG %s", uuid, brick->vg);
+                goto out;
+        }
+        lvm_vg_write (vg);
+        ret = 0;
+out:
+        GF_FREE (uuid);
+
+        if (vg)
+                lvm_vg_close (vg);
+        if (handle)
+                lvm_quit (handle);
+
+        return ret;
+}
+#endif
+
+int
+glusterd_validate_and_create_brickpath (glusterd_brickinfo_t *brickinfo,
+                                        uuid_t volume_id, char **op_errstr,
+                                        gf_boolean_t is_force)
+{
+        int          ret                 = -1;
+        char         parentdir[PATH_MAX] = {0,};
+        struct stat  parent_st           = {0,};
+        struct stat  brick_st            = {0,};
+        struct stat  root_st             = {0,};
+        char         msg[2048]           = {0,};
+        gf_boolean_t is_created          = _gf_false;
+
+        ret = mkdir (brickinfo->path, 0777);
+        if (ret) {
+                if (errno != EEXIST) {
+                        snprintf (msg, sizeof (msg), "Failed to create brick "
+                                  "directory for brick %s:%s. Reason : %s ",
+                                  brickinfo->hostname, brickinfo->path,
+                                  strerror (errno));
+                        goto out;
+                }
+        } else {
+                is_created = _gf_true;
+        }
+
+        ret = lstat (brickinfo->path, &brick_st);
+        if (ret) {
+                snprintf (msg, sizeof (msg), "lstat failed on %s. Reason : %s",
+                          brickinfo->path, strerror (errno));
+                goto out;
+        }
+
+        if ((!is_created) && (!S_ISDIR (brick_st.st_mode))) {
+                snprintf (msg, sizeof (msg), "The provided path %s which is "
+                          "already present, is not a directory",
+                          brickinfo->path);
+                ret = -1;
+                goto out;
+        }
+
+        snprintf (parentdir, sizeof (parentdir), "%s/..", brickinfo->path);
+
+        ret = lstat ("/", &root_st);
+        if (ret) {
+                snprintf (msg, sizeof (msg), "lstat failed on /. Reason : %s",
+                          strerror (errno));
+                goto out;
+        }
+
+        ret = lstat (parentdir, &parent_st);
+        if (ret) {
+                snprintf (msg, sizeof (msg), "lstat failed on %s. Reason : %s",
+                          parentdir, strerror (errno));
+                goto out;
+        }
+
+        if (!is_force) {
+                if (brick_st.st_dev != parent_st.st_dev) {
+                        snprintf (msg, sizeof (msg), "The brick %s:%s is a "
+                                  "mount point. Please create a sub-directory "
+                                  "under the mount point and use that as the "
+                                  "brick directory. Or use 'force' at the end "
+                                  "of the command if you want to override this "
+                                  "behavior.", brickinfo->hostname,
+                                  brickinfo->path);
+                        ret = -1;
+                        goto out;
+                }
+                else if (parent_st.st_dev == root_st.st_dev) {
+                        snprintf (msg, sizeof (msg), "The brick %s:%s is "
+                                  "is being created in the root partition. It "
+                                  "is recommended that you don't use the "
+                                  "system's root partition for storage backend."
+                                  " Or use 'force' at the end of the command if"
+                                  " you want to override this behavior.",
+                                  brickinfo->hostname, brickinfo->path);
+                        ret = -1;
+                        goto out;
+                }
+        }
+
+#ifdef HAVE_BD_XLATOR
+        if (brickinfo->vg[0]) {
+                ret = glusterd_bd_set_vg_tag (volume_id, brickinfo, msg,
+                                              sizeof(msg));
+                if (ret)
+                        goto out;
+        }
+#endif
+        ret = glusterd_check_and_set_brick_xattr (brickinfo->hostname,
+                                                  brickinfo->path, volume_id,
+                                                  op_errstr, is_force);
+        if (ret)
+                goto out;
+
+        ret = 0;
+
+out:
+        if (ret && is_created)
+                rmdir (brickinfo->path);
+        if (ret && !*op_errstr && msg[0] != '\0')
+                *op_errstr = gf_strdup (msg);
+
+        return ret;
+}
+
 int32_t
 glusterd_volume_brickinfo_get (uuid_t uuid, char *hostname, char *path,
                                glusterd_volinfo_t *volinfo,
@@ -1015,12 +1235,15 @@ glusterd_friend_cleanup (glusterd_peerinfo_t *peerinfo)
         GF_ASSERT (peerinfo);
         glusterd_peerctx_t      *peerctx = NULL;
         gf_boolean_t            quorum_action = _gf_false;
+        glusterd_conf_t         *priv = THIS->private;
 
         if (peerinfo->quorum_contrib != QUORUM_NONE)
                 quorum_action = _gf_true;
         if (peerinfo->rpc) {
                 /* cleanup the saved-frames before last unref */
+                synclock_unlock (&priv->big_lock);
                 rpc_clnt_connection_cleanup (&peerinfo->rpc->conn);
+                synclock_lock (&priv->big_lock);
 
                 peerctx = peerinfo->rpc->mydata;
                 peerinfo->rpc->mydata = NULL;
@@ -1038,6 +1261,68 @@ glusterd_friend_cleanup (glusterd_peerinfo_t *peerinfo)
         return 0;
 }
 
+int
+glusterd_volinfo_find_by_volume_id (uuid_t volume_id, glusterd_volinfo_t **volinfo)
+{
+        int32_t                 ret = -1;
+        xlator_t                *this = NULL;
+        glusterd_volinfo_t      *voliter = NULL;
+        glusterd_conf_t         *priv = NULL;
+
+        if (!volume_id)
+                return -1;
+
+        this = THIS;
+        priv = this->private;
+
+        list_for_each_entry (voliter, &priv->volumes, vol_list) {
+                if (uuid_compare (volume_id, voliter->volume_id))
+                        continue;
+                *volinfo = voliter;
+                ret = 0;
+                gf_log (this->name, GF_LOG_DEBUG, "Volume %s found",
+                        voliter->volname);
+                break;
+        }
+        return ret;
+}
+
+int
+glusterd_snap_volinfo_find_by_volume_id (uuid_t volume_id,
+                                         glusterd_volinfo_t **volinfo)
+{
+        int32_t                  ret     = -1;
+        xlator_t                *this    = NULL;
+        glusterd_volinfo_t      *voliter = NULL;
+        glusterd_snap_t         *snap    = NULL;
+        glusterd_conf_t         *priv    = NULL;
+
+        this = THIS;
+        priv = this->private;
+        GF_ASSERT (priv);
+        GF_ASSERT (volinfo);
+
+        if (uuid_is_null(volume_id)) {
+                gf_log (this->name, GF_LOG_WARNING, "Volume UUID is NULL");
+                goto out;
+        }
+
+        list_for_each_entry (snap, &priv->snapshots, snap_list) {
+                list_for_each_entry (voliter, &snap->volumes, vol_list) {
+                        if (uuid_compare (volume_id, voliter->volume_id))
+                                continue;
+                        *volinfo = voliter;
+                        ret = 0;
+                        goto out;
+                }
+        }
+
+        gf_log (this->name, GF_LOG_WARNING, "Snap volume not found");
+out:
+        gf_log (this->name, GF_LOG_TRACE, "Returning %d", ret);
+        return ret;
+}
+
 int32_t
 glusterd_volinfo_find (char *volname, glusterd_volinfo_t **volinfo)
 {
@@ -1047,7 +1332,6 @@ glusterd_volinfo_find (char *volname, glusterd_volinfo_t **volinfo)
         glusterd_conf_t         *priv = NULL;
 
         GF_ASSERT (volname);
-
         this = THIS;
         GF_ASSERT (this);
 
@@ -1056,7 +1340,8 @@ glusterd_volinfo_find (char *volname, glusterd_volinfo_t **volinfo)
 
         list_for_each_entry (tmp_volinfo, &priv->volumes, vol_list) {
                 if (!strcmp (tmp_volinfo->volname, volname)) {
-                        gf_log (this->name, GF_LOG_DEBUG, "Volume %s found", volname);
+                        gf_log (this->name, GF_LOG_DEBUG, "Volume %s found",
+                                volname);
                         ret = 0;
                         *volinfo = tmp_volinfo;
                         break;
@@ -1068,99 +1353,102 @@ glusterd_volinfo_find (char *volname, glusterd_volinfo_t **volinfo)
 }
 
 int32_t
-glusterd_service_stop (const char *service, char *pidfile, int sig,
-                       gf_boolean_t force_kill)
+glusterd_snap_volinfo_find (char *snap_volname, glusterd_snap_t *snap,
+                            glusterd_volinfo_t **volinfo)
 {
-        int32_t  ret = -1;
-        pid_t    pid = -1;
-        FILE    *file = NULL;
-        gf_boolean_t is_locked = _gf_false;
-        xlator_t *this = NULL;
+        int32_t                  ret         = -1;
+        xlator_t                *this        = NULL;
+        glusterd_volinfo_t      *snap_vol    = NULL;
+        glusterd_conf_t         *priv        = NULL;
 
         this = THIS;
-        GF_ASSERT (this);
-        file = fopen (pidfile, "r+");
+        priv = this->private;
+        GF_ASSERT (priv);
+        GF_ASSERT (snap);
+        GF_ASSERT (snap_volname);
 
-        if (!file) {
-                gf_log (this->name, GF_LOG_ERROR, "Unable to open pidfile: %s",
-                                pidfile);
-                if (errno == ENOENT) {
-                        gf_log (this->name, GF_LOG_TRACE, "%s may not be "
-                                "running", service);
+        list_for_each_entry (snap_vol, &snap->volumes, vol_list) {
+                if (!strcmp (snap_vol->volname, snap_volname)) {
                         ret = 0;
+                        *volinfo = snap_vol;
                         goto out;
                 }
-                ret = -1;
-                goto out;
         }
-        ret = lockf (fileno (file), F_TLOCK, 0);
-        if (!ret) {
-                is_locked = _gf_true;
-                ret = unlink (pidfile);
-                if (ret && (ENOENT != errno)) {
-                        gf_log (this->name, GF_LOG_ERROR, "Unable to "
-                                "unlink stale pidfile: %s", pidfile);
-                } else if (ret && (ENOENT == errno)){
+
+        gf_log (this->name, GF_LOG_WARNING, "Snap volume %s not found",
+                snap_volname);
+out:
+        gf_log (this->name, GF_LOG_TRACE, "Returning %d", ret);
+        return ret;
+}
+
+int32_t
+glusterd_snap_volinfo_find_from_parent_volname (char *origin_volname,
+                                      glusterd_snap_t *snap,
+                                      glusterd_volinfo_t **volinfo)
+{
+        int32_t                  ret         = -1;
+        xlator_t                *this        = NULL;
+        glusterd_volinfo_t      *snap_vol    = NULL;
+        glusterd_conf_t         *priv        = NULL;
+
+        this = THIS;
+        priv = this->private;
+        GF_ASSERT (priv);
+        GF_ASSERT (snap);
+        GF_ASSERT (origin_volname);
+
+        list_for_each_entry (snap_vol, &snap->volumes, vol_list) {
+                if (!strcmp (snap_vol->parent_volname, origin_volname)) {
                         ret = 0;
-                        gf_log (this->name, GF_LOG_DEBUG, "Brick already "
-                                "stopped");
+                        *volinfo = snap_vol;
+                        goto out;
                 }
-                goto out;
         }
 
+        gf_log (this->name, GF_LOG_DEBUG, "Snap volume not found(snap: %s, "
+                "origin-volume: %s", snap->snapname, origin_volname);
 
-        ret = fscanf (file, "%d", &pid);
-        if (ret <= 0) {
-                gf_log (this->name, GF_LOG_ERROR, "Unable to read pidfile: %s",
-                                pidfile);
-                ret = -1;
+out:
+        gf_log (this->name, GF_LOG_TRACE, "Returning %d", ret);
+        return ret;
+}
+
+int32_t
+glusterd_service_stop (const char *service, char *pidfile, int sig,
+                       gf_boolean_t force_kill)
+{
+        int32_t  ret = -1;
+        pid_t    pid = -1;
+        xlator_t *this = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        if (!glusterd_is_service_running (pidfile, &pid)) {
+                ret = 0;
+                gf_log (this->name, GF_LOG_INFO, "%s already stopped", service);
                 goto out;
         }
-        fclose (file);
-        file = NULL;
-
         gf_log (this->name, GF_LOG_DEBUG, "Stopping gluster %s running in pid: "
                 "%d", service, pid);
 
         ret = kill (pid, sig);
+        if (!force_kill)
+                goto out;
 
-        if (force_kill) {
-                sleep (1);
-                file = fopen (pidfile, "r+");
-                if (!file) {
-                        ret = 0;
-                        goto out;
-                }
-                ret = lockf (fileno (file), F_TLOCK, 0);
-                if (ret && ((EAGAIN == errno) || (EACCES == errno))) {
-                        ret = kill (pid, SIGKILL);
-                        if (ret) {
-                                gf_log (this->name, GF_LOG_ERROR, "Unable to "
-                                        "kill pid %d reason: %s", pid,
-                                        strerror(errno));
-                                goto out;
-                        }
-
-                } else if (0 == ret){
-                        is_locked = _gf_true;
-                }
-                ret = unlink (pidfile);
-                if (ret && (ENOENT != errno)) {
+        sleep (1);
+        if (glusterd_is_service_running (pidfile, NULL)) {
+                ret = kill (pid, SIGKILL);
+                if (ret) {
                         gf_log (this->name, GF_LOG_ERROR, "Unable to "
-                                "unlink pidfile: %s", pidfile);
+                                "kill pid %d reason: %s", pid,
+                                strerror(errno));
                         goto out;
                 }
         }
 
         ret = 0;
 out:
-        if (is_locked && file)
-                if (lockf (fileno (file), F_ULOCK, 0) < 0)
-                        gf_log (this->name, GF_LOG_WARNING, "Cannot unlock "
-                                "pidfile: %s reason: %s", pidfile,
-                                strerror(errno));
-        if (file)
-                fclose (file);
         return ret;
 }
 
@@ -1206,33 +1494,41 @@ glusterd_set_brick_socket_filepath (glusterd_volinfo_t *volinfo,
  */
 int32_t
 glusterd_brick_connect (glusterd_volinfo_t  *volinfo,
-                        glusterd_brickinfo_t  *brickinfo)
+                        glusterd_brickinfo_t  *brickinfo, char *socketpath)
 {
         int                     ret = 0;
-        char                    socketpath[PATH_MAX] = {0};
+        char                    volume_id_str[64];
+        char                    *brickid = NULL;
         dict_t                  *options = NULL;
         struct rpc_clnt         *rpc = NULL;
+        glusterd_conf_t         *priv = THIS->private;
 
         GF_ASSERT (volinfo);
         GF_ASSERT (brickinfo);
+        GF_ASSERT (socketpath);
 
         if (brickinfo->rpc == NULL) {
-                glusterd_set_brick_socket_filepath (volinfo, brickinfo,
-                                                    socketpath,
-                                                    sizeof (socketpath));
-
                 /* Setting frame-timeout to 10mins (600seconds).
                  * Unix domain sockets ensures that the connection is reliable.
                  * The default timeout of 30mins used for unreliable network
                  * connections is too long for unix domain socket connections.
                  */
-                ret = rpc_clnt_transport_unix_options_build (&options,
-                                                             socketpath, 600);
+                ret = rpc_transport_unix_options_build (&options, socketpath,
+                                                        600);
                 if (ret)
                         goto out;
+
+                uuid_utoa_r (volinfo->volume_id, volume_id_str);
+                ret = gf_asprintf (&brickid, "%s:%s:%s", volume_id_str,
+                                   brickinfo->hostname, brickinfo->path);
+                if (ret < 0)
+                        goto out;
+
+                synclock_unlock (&priv->big_lock);
                 ret = glusterd_rpc_create (&rpc, options,
                                            glusterd_brick_rpc_notify,
-                                           brickinfo);
+                                           brickid);
+                synclock_lock (&priv->big_lock);
                 if (ret)
                         goto out;
                 brickinfo->rpc = rpc;
@@ -1242,6 +1538,35 @@ out:
         return ret;
 }
 
+/* Caller should ensure that brick process is not running*/
+static void
+_reap_brick_process (char *pidfile, char *brickpath)
+{
+        unlink (pidfile);
+        /* Brick process is not running and pmap may have an entry for it.*/
+        pmap_registry_remove (THIS, 0, brickpath,
+                              GF_PMAP_PORT_BRICKSERVER, NULL);
+}
+
+static int
+_mk_rundir_p (glusterd_volinfo_t *volinfo)
+{
+        char voldir[PATH_MAX]   = {0,};
+        char rundir[PATH_MAX]   = {0,};
+        glusterd_conf_t *priv   = NULL;
+        xlator_t        *this   = NULL;
+        int             ret     = -1;
+
+        this = THIS;
+        priv = this->private;
+        GLUSTERD_GET_VOLUME_DIR (voldir, volinfo, priv);
+        snprintf (rundir, sizeof (rundir)-1, "%s/run", voldir);
+        ret =  mkdir_p (rundir, 0777, _gf_true);
+        if (ret)
+                gf_log (this->name, GF_LOG_ERROR, "Failed to create rundir");
+        return ret;
+}
+
 int32_t
 glusterd_volume_start_glusterfs (glusterd_volinfo_t  *volinfo,
                                  glusterd_brickinfo_t  *brickinfo,
@@ -1250,22 +1575,17 @@ glusterd_volume_start_glusterfs (glusterd_volinfo_t  *volinfo,
         int32_t                 ret = -1;
         xlator_t                *this = NULL;
         glusterd_conf_t         *priv = NULL;
-        char                    pidfile[PATH_MAX] = {0,};
+        char                    pidfile[PATH_MAX+1] = {0,};
         char                    volfile[PATH_MAX] = {0,};
-        char                    path[PATH_MAX] = {0,};
         runner_t                runner = {0,};
-        char                    rundir[PATH_MAX] = {0,};
         char                    exp_path[PATH_MAX] = {0,};
         char                    logfile[PATH_MAX] = {0,};
         int                     port = 0;
         int                     rdma_port = 0;
-        FILE                    *file = NULL;
-        gf_boolean_t            is_locked = _gf_false;
         char                    socketpath[PATH_MAX] = {0};
         char                    glusterd_uuid[1024] = {0,};
-#ifdef DEBUG
         char                    valgrind_logfile[PATH_MAX] = {0};
-#endif
+
         GF_ASSERT (volinfo);
         GF_ASSERT (brickinfo);
 
@@ -1275,100 +1595,83 @@ glusterd_volume_start_glusterfs (glusterd_volinfo_t  *volinfo,
         priv = this->private;
         GF_ASSERT (priv);
 
-        GLUSTERD_GET_VOLUME_DIR (path, volinfo, priv);
-        snprintf (rundir, PATH_MAX, "%s/run", path);
-        ret = mkdir (rundir, 0777);
-
-        if ((ret == -1) && (EEXIST != errno)) {
-                gf_log (this->name, GF_LOG_ERROR, "Unable to create rundir %s."
-                        "Reason : %s", rundir, strerror (errno));
+        if (brickinfo->snap_status == -1) {
+                gf_log (this->name, GF_LOG_INFO,
+                        "Snapshot is pending on %s:%s. "
+                        "Hence not starting the brick",
+                        brickinfo->hostname,
+                        brickinfo->path);
+                ret = 0;
                 goto out;
         }
 
+        ret = _mk_rundir_p (volinfo);
+        if (ret)
+                goto out;
+
         glusterd_set_brick_socket_filepath (volinfo, brickinfo, socketpath,
                                             sizeof (socketpath));
-        GLUSTERD_GET_BRICK_PIDFILE (pidfile, path, brickinfo->hostname,
-                                    brickinfo->path);
 
-        file = fopen (pidfile, "r+");
-        if (file) {
-                ret = lockf (fileno (file), F_TLOCK, 0);
-                if (ret && ((EAGAIN == errno) || (EACCES == errno))) {
-                        ret = 0;
-                        gf_log (this->name, GF_LOG_DEBUG, "brick %s:%s "
-                                "already started", brickinfo->hostname,
-                                brickinfo->path);
-                        goto connect;
-                }
-        }
-
-        ret = pmap_registry_search (this, brickinfo->path,
-                                    GF_PMAP_PORT_BRICKSERVER);
-        if (ret) {
-                ret = 0;
-                file = fopen (pidfile, "r+");
-                if (file) {
-                        ret = lockf (fileno (file), F_TLOCK, 0);
-                        if (ret && ((EAGAIN == errno) || (EACCES == errno))) {
-                                ret = 0;
-                                gf_log (this->name, GF_LOG_DEBUG, "brick %s:%s "
-                                        "already started", brickinfo->hostname,
-                                        brickinfo->path);
-                                goto connect;
-                        } else if (0 == ret) {
-                                is_locked = _gf_true;
-                        }
-                }
-                /* This means, pmap has the entry, remove it */
-                ret = pmap_registry_remove (this, 0, brickinfo->path,
-                                            GF_PMAP_PORT_BRICKSERVER, NULL);
-        }
-        unlink (pidfile);
+        GLUSTERD_GET_BRICK_PIDFILE (pidfile, volinfo, brickinfo, priv);
+        if (glusterd_is_service_running (pidfile, NULL))
+                goto connect;
 
-        gf_log (this->name, GF_LOG_DEBUG, "About to start glusterfs"
-                " for brick %s:%s", brickinfo->hostname,
-                brickinfo->path);
-        GLUSTERD_REMOVE_SLASH_FROM_PATH (brickinfo->path, exp_path);
-        snprintf (volfile, PATH_MAX, "%s.%s.%s", volinfo->volname,
-                  brickinfo->hostname, exp_path);
-
-        if (!brickinfo->logfile && volinfo->logdir) {
-                snprintf (logfile, PATH_MAX, "%s/%s.log", volinfo->logdir,
-                                                          exp_path);
-                brickinfo->logfile = gf_strdup (logfile);
-        } else if (!brickinfo->logfile) {
-                snprintf (logfile, PATH_MAX, "%s/bricks/%s.log",
-                          DEFAULT_LOG_FILE_DIRECTORY, exp_path);
-                brickinfo->logfile = gf_strdup (logfile);
-        }
+        _reap_brick_process (pidfile, brickinfo->path);
 
         port = brickinfo->port;
         if (!port)
                 port = pmap_registry_alloc (THIS);
 
+        /* Build the exp_path, before starting the glusterfsd even in
+           valgrind mode. Otherwise all the glusterfsd processes start
+           writing the valgrind log to the same file.
+        */
+        GLUSTERD_REMOVE_SLASH_FROM_PATH (brickinfo->path, exp_path);
         runinit (&runner);
 
-#ifdef DEBUG
         if (priv->valgrind) {
+                /* Run bricks with valgrind */
                 if (volinfo->logdir) {
                         snprintf (valgrind_logfile, PATH_MAX,
-                                  "%s/valgrind-%s-%s.log", volinfo->logdir,
+                                  "%s/valgrind-%s-%s.log",
+                                  volinfo->logdir,
                                   volinfo->volname, exp_path);
                 } else {
-                         snprintf (valgrind_logfile, PATH_MAX,
-                                   "%s/bricks/valgrind-%s-%s.log",
-                                   DEFAULT_LOG_FILE_DIRECTORY,
-                                   volinfo->volname, exp_path);
+                        snprintf (valgrind_logfile, PATH_MAX,
+                                  "%s/bricks/valgrind-%s-%s.log",
+                                  DEFAULT_LOG_FILE_DIRECTORY,
+                                  volinfo->volname, exp_path);
                 }
-                /* Run bricks with valgrind */
+
                 runner_add_args (&runner, "valgrind", "--leak-check=full",
-                                "--trace-children=yes", NULL);
+                                 "--trace-children=yes", "--track-origins=yes",
+                                 NULL);
                 runner_argprintf (&runner, "--log-file=%s", valgrind_logfile);
-	}
-#endif
+        }
+
+        if (volinfo->is_snap_volume) {
+                snprintf (volfile, PATH_MAX,"/%s/%s/%s.%s.%s",
+                          GLUSTERD_VOL_SNAP_DIR_PREFIX,
+                          volinfo->snapshot->snapname, volinfo->volname,
+                          brickinfo->hostname, exp_path);
+        } else {
+                snprintf (volfile, PATH_MAX, "%s.%s.%s", volinfo->volname,
+                          brickinfo->hostname, exp_path);
+        }
+
+        if (volinfo->logdir) {
+                snprintf (logfile, PATH_MAX, "%s/%s.log",
+                          volinfo->logdir, exp_path);
+        } else {
+                snprintf (logfile, PATH_MAX, "%s/bricks/%s.log",
+                          DEFAULT_LOG_FILE_DIRECTORY, exp_path);
+        }
+        if (!brickinfo->logfile)
+                brickinfo->logfile = gf_strdup (logfile);
+
         (void) snprintf (glusterd_uuid, 1024, "*-posix.glusterd-uuid=%s",
                          uuid_utoa (MY_UUID));
-	runner_add_args (&runner, SBIN_DIR"/glusterfsd",
+        runner_add_args (&runner, SBIN_DIR"/glusterfsd",
                          "-s", brickinfo->hostname, "--volfile-id", volfile,
                          "-p", pidfile, "-S", socketpath,
                          "--brick-name", brickinfo->path,
@@ -1376,7 +1679,7 @@ glusterd_volume_start_glusterfs (glusterd_volinfo_t  *volinfo,
                          "--xlator-option", glusterd_uuid,
                          NULL);
 
-	runner_add_arg (&runner, "--brick-port");
+        runner_add_arg (&runner, "--brick-port");
         if (volinfo->transport_type != GF_TRANSPORT_BOTH_TCP_RDMA) {
                 runner_argprintf (&runner, "%d", port);
         } else {
@@ -1397,30 +1700,30 @@ glusterd_volume_start_glusterfs (glusterd_volinfo_t  *volinfo,
                 runner_add_arg (&runner, "--mem-accounting");
 
         runner_log (&runner, "", GF_LOG_DEBUG, "Starting GlusterFS");
-        if (wait)
+        if (wait) {
+                synclock_unlock (&priv->big_lock);
                 ret = runner_run (&runner);
-        else
+                synclock_lock (&priv->big_lock);
+
+        } else {
                 ret = runner_run_nowait (&runner);
+        }
 
         if (ret)
                 goto out;
 
-        //pmap_registry_bind (THIS, port, brickinfo->path);
         brickinfo->port = port;
         brickinfo->rdma_port = rdma_port;
 
 connect:
-        ret = glusterd_brick_connect (volinfo, brickinfo);
-        if (ret)
+        ret = glusterd_brick_connect (volinfo, brickinfo, socketpath);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Failed to connect to brick %s:%s on %s",
+                        brickinfo->hostname, brickinfo->path, socketpath);
                 goto out;
+        }
 out:
-        if (is_locked && file)
-                if (lockf (fileno (file), F_ULOCK, 0) < 0)
-                        gf_log (this->name, GF_LOG_WARNING, "Cannot unlock "
-                                "pidfile: %s reason: %s", pidfile,
-                                strerror(errno));
-        if (file)
-                fclose (file);
         return ret;
 }
 
@@ -1458,15 +1761,25 @@ glusterd_brick_unlink_socket_file (glusterd_volinfo_t *volinfo,
 int32_t
 glusterd_brick_disconnect (glusterd_brickinfo_t *brickinfo)
 {
+        rpc_clnt_t              *rpc = NULL;
+        glusterd_conf_t         *priv = THIS->private;
+
         GF_ASSERT (brickinfo);
 
-        if (brickinfo->rpc) {
-                /* cleanup the saved-frames before last unref */
-                rpc_clnt_connection_cleanup (&brickinfo->rpc->conn);
+        if (!brickinfo) {
+                gf_log_callingfn ("glusterd", GF_LOG_WARNING, "!brickinfo");
+                return -1;
+        }
 
-                rpc_clnt_unref (brickinfo->rpc);
-                brickinfo->rpc = NULL;
+        rpc            = brickinfo->rpc;
+        brickinfo->rpc = NULL;
+
+        if (rpc) {
+                synclock_unlock (&priv->big_lock);
+                rpc_clnt_unref (rpc);
+                synclock_lock (&priv->big_lock);
         }
+
         return 0;
 }
 
@@ -1475,11 +1788,10 @@ glusterd_volume_stop_glusterfs (glusterd_volinfo_t  *volinfo,
                                 glusterd_brickinfo_t   *brickinfo,
                                 gf_boolean_t del_brick)
 {
-        xlator_t                *this = NULL;
-        glusterd_conf_t         *priv = NULL;
-        char                    pidfile[PATH_MAX] = {0,};
-        char                    path[PATH_MAX] = {0,};
-        int                     ret = 0;
+        xlator_t        *this                   = NULL;
+        glusterd_conf_t *priv                   = NULL;
+        char            pidfile[PATH_MAX]       = {0,};
+        int             ret                     = 0;
 
         GF_ASSERT (volinfo);
         GF_ASSERT (brickinfo);
@@ -1493,11 +1805,7 @@ glusterd_volume_stop_glusterfs (glusterd_volinfo_t  *volinfo,
 
         if (GLUSTERD_STATUS_STARTED == volinfo->status) {
                 (void) glusterd_brick_disconnect (brickinfo);
-
-                GLUSTERD_GET_VOLUME_DIR (path, volinfo, priv);
-                GLUSTERD_GET_BRICK_PIDFILE (pidfile, path, brickinfo->hostname,
-                                            brickinfo->path);
-
+                GLUSTERD_GET_BRICK_PIDFILE (pidfile, volinfo, brickinfo, priv);
                 ret = glusterd_service_stop ("brick", pidfile, SIGTERM, _gf_false);
                 if (ret == 0) {
                         glusterd_set_brick_status (brickinfo, GF_BRICK_STOPPED);
@@ -1682,13 +1990,14 @@ glusterd_volume_compute_cksum (glusterd_volinfo_t  *volinfo)
 
         snprintf (filepath, sizeof (filepath), "%s/%s", path,
                   GLUSTERD_VOLUME_INFO_FILE);
-        snprintf (sort_filepath, sizeof (sort_filepath), "/tmp/%s.XXXXXX",
-                  volinfo->volname);
+        snprintf (sort_filepath, sizeof (sort_filepath),
+                  "/tmp/%s.XXXXXX", volinfo->volname);
 
         sort_fd = mkstemp (sort_filepath);
         if (sort_fd < 0) {
                 gf_log (this->name, GF_LOG_ERROR, "Could not generate temp "
-                        "file, reason: %s for volume: %s", strerror (errno),
+                        "file, reason: %s for %s: %s", strerror (errno),
+                        (volinfo->is_snap_volume)?"snap":"volume",
                         volinfo->volname);
                 goto out;
         } else {
@@ -1729,7 +2038,6 @@ glusterd_volume_compute_cksum (glusterd_volinfo_t  *volinfo)
                 goto out;
 
         volinfo->cksum = cksum;
-
 out:
         if (fd > 0)
                close (fd);
@@ -1808,7 +2116,10 @@ glusterd_add_volume_to_dict (glusterd_volinfo_t *volinfo,
         glusterd_dict_ctx_t     ctx               = {0};
         char                    *rebalance_id_str = NULL;
         char                    *rb_id_str        = NULL;
+        xlator_t                *this             = NULL;
 
+        this = THIS;
+        GF_ASSERT (this);
         GF_ASSERT (dict);
         GF_ASSERT (volinfo);
 
@@ -1823,6 +2134,15 @@ glusterd_add_volume_to_dict (glusterd_volinfo_t *volinfo,
         if (ret)
                 goto out;
 
+        snprintf (key, sizeof (key), "volume%d.is_volume_restored", count);
+        ret = dict_set_int32 (dict, key, volinfo->is_volume_restored);
+        if (ret) {
+                gf_log (THIS->name, GF_LOG_ERROR, "Failed to set "
+                        "is_volume_restored option for %s volume",
+                        volinfo->volname);
+                goto out;
+        }
+
         memset (key, 0, sizeof (key));
         snprintf (key, sizeof (key), "volume%d.brick_count", count);
         ret = dict_set_int32 (dict, key, volinfo->brick_count);
@@ -1877,6 +2197,20 @@ glusterd_add_volume_to_dict (glusterd_volinfo_t *volinfo,
         if (ret)
                 goto out;
 
+        snprintf (key, sizeof (key), "volume%d.is_snap_volume", count);
+        ret = dict_set_uint32 (dict, key, volinfo->is_snap_volume);
+        if (ret) {
+                gf_log (THIS->name, GF_LOG_ERROR, "Unable to set %s", key);
+                goto out;
+        }
+
+        snprintf (key, sizeof (key), "volume%d.snap-max-hard-limit", count);
+        ret = dict_set_uint64 (dict, key, volinfo->snap_max_hard_limit);
+        if (ret) {
+                gf_log (THIS->name, GF_LOG_ERROR, "Unable to set %s", key);
+                goto out;
+        }
+
         volume_id_str = gf_strdup (uuid_utoa (volinfo->volume_id));
         if (!volume_id_str) {
                 ret = -1;
@@ -2023,9 +2357,42 @@ glusterd_add_volume_to_dict (glusterd_volinfo_t *volinfo,
                 if (ret)
                         goto out;
 
+                snprintf (key, sizeof (key), "volume%d.brick%d.snap_status",
+                          count, i);
+                ret = dict_set_int32 (dict, key, brickinfo->snap_status);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Failed to set snap_status for %s:%s",
+                                brickinfo->hostname,
+                                brickinfo->path);
+                        goto out;
+                }
+
+                snprintf (key, sizeof (key), "volume%d.brick%d.device_path",
+                          count, i);
+                ret = dict_set_str (dict, key, brickinfo->device_path);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Failed to set snap_device for %s:%s",
+                                brickinfo->hostname,
+                                brickinfo->path);
+                        goto out;
+                }
+
                 i++;
         }
 
+        /* Add volume op-versions to dict. This prevents volume inconsistencies
+         * in the cluster
+         */
+        memset (key, 0, sizeof (key));
+        snprintf (key, sizeof (key), "volume%d.op-version", count);
+        ret = dict_set_int32 (dict, key, volinfo->op_version);
+        if (ret)
+                goto out;
+        memset (key, 0, sizeof (key));
+        snprintf (key, sizeof (key), "volume%d.client-op-version", count);
+        ret = dict_set_int32 (dict, key, volinfo->client_op_version);
 
 out:
         GF_FREE (volume_id_str);
@@ -2087,7 +2454,8 @@ out:
 }
 
 int32_t
-glusterd_compare_friend_volume (dict_t *vols, int32_t count, int32_t *status)
+glusterd_compare_friend_volume (dict_t *vols, int32_t count, int32_t *status,
+                                char *hostname)
 {
 
         int32_t                 ret = -1;
@@ -2123,8 +2491,8 @@ glusterd_compare_friend_volume (dict_t *vols, int32_t count, int32_t *status)
                 //Mismatch detected
                 ret = 0;
                 gf_log ("", GF_LOG_ERROR, "Version of volume %s differ."
-                        "local version = %d, remote version = %d",
-                        volinfo->volname, volinfo->version, version);
+                        "local version = %d, remote version = %d on peer %s",
+                        volinfo->volname, volinfo->version, version, hostname);
                 *status = GLUSTERD_VOL_COMP_UPDATE_REQ;
                 goto out;
         } else if (version < volinfo->version) {
@@ -2143,8 +2511,8 @@ glusterd_compare_friend_volume (dict_t *vols, int32_t count, int32_t *status)
         if (cksum != volinfo->cksum) {
                 ret = 0;
                 gf_log ("", GF_LOG_ERROR, "Cksums of volume %s differ."
-                        " local cksum = %d, remote cksum = %d",
-                        volinfo->volname, volinfo->cksum, cksum);
+                        " local cksum = %u, remote cksum = %u on peer %s",
+                        volinfo->volname, volinfo->cksum, cksum, hostname);
                 *status = GLUSTERD_VOL_COMP_RJT;
                 goto out;
         }
@@ -2391,12 +2759,27 @@ out:
         return in;
 }
 
+int
+glusterd_spawn_daemons (void *opaque)
+{
+        glusterd_conf_t *conf = THIS->private;
+        gf_boolean_t    start_bricks = !conf->restart_done;
+
+        if (start_bricks) {
+                glusterd_restart_bricks (conf);
+                conf->restart_done = _gf_true;
+        }
+        glusterd_restart_gsyncds (conf);
+        glusterd_restart_rebalance (conf);
+        return 0;
+}
+
 void
 glusterd_do_volume_quorum_action (xlator_t *this, glusterd_volinfo_t *volinfo,
                                   gf_boolean_t meets_quorum)
 {
         glusterd_brickinfo_t    *brickinfo = NULL;
-        glusterd_conf_t         *conf = NULL;
+        glusterd_conf_t         *conf      = NULL;
 
         conf = this->private;
         if (volinfo->status != GLUSTERD_STATUS_STARTED)
@@ -2514,6 +2897,8 @@ glusterd_import_new_brick (dict_t *vols, int32_t vol_count,
 {
         char                    key[512] = {0,};
         int                     ret = -1;
+        int32_t                 snap_status = 0;
+        char                    *snap_device = NULL;
         char                    *hostname = NULL;
         char                    *path = NULL;
         glusterd_brickinfo_t    *new_brickinfo = NULL;
@@ -2541,12 +2926,31 @@ glusterd_import_new_brick (dict_t *vols, int32_t vol_count,
                 goto out;
         }
 
+        snprintf (key, sizeof (key), "volume%d.brick%d.snap_status",
+                  vol_count, brick_count);
+        ret = dict_get_int32 (vols, key, &snap_status);
+        if (ret) {
+                snprintf (msg, sizeof (msg), "%s missing in payload", key);
+                goto out;
+        }
+
+        snprintf (key, sizeof (key), "volume%d.brick%d.device_path",
+                  vol_count, brick_count);
+        ret = dict_get_str (vols, key, &snap_device);
+        if (ret) {
+                snprintf (msg, sizeof (msg), "%s missing in payload", key);
+                goto out;
+        }
+
         ret = glusterd_brickinfo_new (&new_brickinfo);
         if (ret)
                 goto out;
 
         strcpy (new_brickinfo->path, path);
         strcpy (new_brickinfo->hostname, hostname);
+        strcpy (new_brickinfo->device_path, snap_device);
+        new_brickinfo->snap_status = snap_status;
+
         //peerinfo might not be added yet
         (void) glusterd_resolve_brick (new_brickinfo);
         ret = 0;
@@ -2600,6 +3004,9 @@ glusterd_import_volinfo (dict_t *vols, int count,
         int                rb_status         = 0;
         char               *rebalance_id_str = NULL;
         char               *rb_id_str        = NULL;
+        int                op_version        = 0;
+        int                client_op_version = 0;
+        uint32_t           is_snap_volume    = 0;
 
         GF_ASSERT (vols);
         GF_ASSERT (volinfo);
@@ -2611,6 +3018,22 @@ glusterd_import_volinfo (dict_t *vols, int count,
                 goto out;
         }
 
+        memset (key, 0, sizeof (key));
+        snprintf (key, sizeof (key), "volume%d.is_snap_volume", count);
+        ret = dict_get_uint32 (vols, key, &is_snap_volume);
+        if (ret) {
+                snprintf (msg, sizeof (msg), "%s missing in payload for %s",
+                          key, volname);
+                goto out;
+        }
+
+        if (is_snap_volume == _gf_true) {
+                gf_log (THIS->name, GF_LOG_DEBUG,
+                        "Not syncing snap volume %s", volname);
+                ret = 0;
+                goto out;
+        }
+
         ret = glusterd_volinfo_new (&new_volinfo);
         if (ret)
                 goto out;
@@ -2736,6 +3159,25 @@ glusterd_import_volinfo (dict_t *vols, int count,
                 goto out;
         }
 
+        new_volinfo->is_snap_volume = is_snap_volume;
+
+        snprintf (key, sizeof (key), "volume%d.is_volume_restored", count);
+        ret = dict_get_uint32 (vols, key, &new_volinfo->is_volume_restored);
+        if (ret) {
+                gf_log (THIS->name, GF_LOG_ERROR, "Failed to get "
+                        "is_volume_restored option for %s",
+                        volname);
+                goto out;
+        }
+
+        snprintf (key, sizeof (key), "volume%d.snap-max-hard-limit", count);
+        ret = dict_get_uint64 (vols, key, &new_volinfo->snap_max_hard_limit);
+        if (ret) {
+                snprintf (msg, sizeof (msg), "%s missing in payload for %s",
+                          key, volname);
+                goto out;
+        }
+
         memset (key, 0, sizeof (key));
         snprintf (key, sizeof (key), "volume%d.rebalance", count);
         ret = dict_get_uint32 (vols, key, &new_volinfo->rebal.defrag_cmd);
@@ -2826,6 +3268,40 @@ glusterd_import_volinfo (dict_t *vols, int count,
         ret = glusterd_import_friend_volume_opts (vols, count, new_volinfo);
         if (ret)
                 goto out;
+
+        /* Import the volume's op-versions if available else set it to 1.
+         * Not having op-versions implies this informtation was obtained from a
+         * op-version 1 friend (gluster-3.3), ergo the cluster is at op-version
+         * 1 and all volumes are at op-versions 1.
+         *
+         * Either both the volume op-versions should be absent or both should be
+         * present. Only one being present is a failure
+         */
+        memset (key, 0, sizeof (key));
+        snprintf (key, sizeof (key), "volume%d.op-version", count);
+        ret = dict_get_int32 (vols, key, &op_version);
+        if (ret)
+                ret = 0;
+        memset (key, 0, sizeof (key));
+        snprintf (key, sizeof (key), "volume%d.client-op-version", count);
+        ret = dict_get_int32 (vols, key, &client_op_version);
+        if (ret)
+                ret = 0;
+
+        if (op_version && client_op_version) {
+                new_volinfo->op_version = op_version;
+                new_volinfo->client_op_version = client_op_version;
+        } else if (((op_version == 0) && (client_op_version != 0)) ||
+                   ((op_version != 0) && (client_op_version == 0))) {
+                ret = -1;
+                gf_log ("glusterd", GF_LOG_ERROR,
+                        "Only one volume op-version found");
+                goto out;
+        } else {
+                new_volinfo->op_version = 1;
+                new_volinfo->client_op_version = 1;
+        }
+
         ret = glusterd_import_bricks (vols, count, new_volinfo);
         if (ret)
                 goto out;
@@ -2957,7 +3433,7 @@ glusterd_delete_stale_volume (glusterd_volinfo_t *stale_volinfo,
         (void) glusterd_delete_all_bricks (stale_volinfo);
         if (stale_volinfo->shandle) {
                 unlink (stale_volinfo->shandle->path);
-                (void) glusterd_store_handle_destroy (stale_volinfo->shandle);
+                (void) gf_store_handle_destroy (stale_volinfo->shandle);
                 stale_volinfo->shandle = NULL;
         }
         (void) glusterd_volinfo_delete (stale_volinfo);
@@ -2984,6 +3460,12 @@ glusterd_import_friend_volume (dict_t *vols, size_t count)
         if (ret)
                 goto out;
 
+        if (!new_volinfo) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "Not importing snap volume");
+                goto out;
+        }
+
         ret = glusterd_volinfo_find (new_volinfo->volname, &old_volinfo);
         if (0 == ret) {
                 (void) glusterd_delete_stale_volume (old_volinfo, new_volinfo);
@@ -3119,7 +3601,7 @@ out:
 }
 
 int32_t
-glusterd_compare_friend_data (dict_t  *vols, int32_t *status)
+glusterd_compare_friend_data (dict_t  *vols, int32_t *status, char *hostname)
 {
         int32_t                 ret = -1;
         int32_t                 count = 0;
@@ -3136,7 +3618,8 @@ glusterd_compare_friend_data (dict_t  *vols, int32_t *status)
                 goto out;
 
         while (i <= count) {
-                ret = glusterd_compare_friend_volume (vols, i, status);
+                ret = glusterd_compare_friend_volume (vols, i, status,
+                                                      hostname);
                 if (ret)
                         goto out;
 
@@ -3387,6 +3870,7 @@ glusterd_nodesvc_connect (char *server, char *socketpath) {
         int                     ret = 0;
         dict_t                  *options = NULL;
         struct rpc_clnt         *rpc = NULL;
+        glusterd_conf_t         *priv = THIS->private;
 
         rpc = glusterd_nodesvc_get_rpc (server);
 
@@ -3396,13 +3880,15 @@ glusterd_nodesvc_connect (char *server, char *socketpath) {
                  * The default timeout of 30mins used for unreliable network
                  * connections is too long for unix domain socket connections.
                  */
-                ret = rpc_clnt_transport_unix_options_build (&options,
-                                                             socketpath, 600);
+                ret = rpc_transport_unix_options_build (&options, socketpath,
+                                                        600);
                 if (ret)
                         goto out;
+                synclock_unlock (&priv->big_lock);
                 ret = glusterd_rpc_create (&rpc, options,
                                            glusterd_nodesvc_rpc_notify,
                                            server);
+                synclock_lock (&priv->big_lock);
                 if (ret)
                         goto out;
                 (void) glusterd_nodesvc_set_rpc (server, rpc);
@@ -3417,12 +3903,10 @@ glusterd_nodesvc_disconnect (char *server)
         struct rpc_clnt         *rpc = NULL;
 
         rpc = glusterd_nodesvc_get_rpc (server);
+        (void)glusterd_nodesvc_set_rpc (server, NULL);
 
-        if (rpc) {
-                rpc_clnt_connection_cleanup (&rpc->conn);
+        if (rpc)
                 rpc_clnt_unref (rpc);
-                (void)glusterd_nodesvc_set_rpc (server, NULL);
-        }
 
         return 0;
 }
@@ -3441,9 +3925,7 @@ glusterd_nodesvc_start (char *server)
         char                    sockfpath[PATH_MAX] = {0,};
         char                    volfileid[256]             = {0};
         char                    glusterd_uuid_option[1024] = {0};
-#ifdef DEBUG
         char                    valgrind_logfile[PATH_MAX] = {0};
-#endif
 
         this = THIS;
         GF_ASSERT(this);
@@ -3480,7 +3962,6 @@ glusterd_nodesvc_start (char *server)
 
         runinit (&runner);
 
-#ifdef DEBUG
         if (priv->valgrind) {
                 snprintf (valgrind_logfile, PATH_MAX,
                           "%s/valgrind-%s.log",
@@ -3488,10 +3969,10 @@ glusterd_nodesvc_start (char *server)
                           server);
 
                 runner_add_args (&runner, "valgrind", "--leak-check=full",
-                                 "--trace-children=yes", NULL);
+                                 "--trace-children=yes", "--track-origins=yes",
+                                 NULL);
                 runner_argprintf (&runner, "--log-file=%s", valgrind_logfile);
         }
-#endif
 
         runner_add_args (&runner, SBIN_DIR"/glusterfs",
                          "-s", "localhost",
@@ -3617,6 +4098,10 @@ glusterd_nfs_pmap_deregister ()
         else
                 gf_log ("", GF_LOG_ERROR, "De-registration of NLM v1 failed");
 
+        if (pmap_unset (ACL_PROGRAM, ACLV3_VERSION))
+                gf_log ("", GF_LOG_INFO, "De-registered ACL v3 successfully");
+        else
+                gf_log ("", GF_LOG_ERROR, "De-registration of ACL v3 failed");
 }
 
 int
@@ -3797,6 +4282,11 @@ glusterd_reconfigure_nfs ()
         int             ret             = -1;
         gf_boolean_t    identical       = _gf_false;
 
+        /*
+         * Check both OLD and NEW volfiles, if they are SAME by size
+         * and cksum i.e. "character-by-character". If YES, then
+         * NOTHING has been changed, just return.
+         */
         ret = glusterd_check_nfs_volfile_identical (&identical);
         if (ret)
                 goto out;
@@ -3806,6 +4296,31 @@ glusterd_reconfigure_nfs ()
                 goto out;
         }
 
+        /*
+         * They are not identical. Find out if the topology is changed
+         * OR just the volume options. If just the options which got
+         * changed, then inform the xlator to reconfigure the options.
+         */
+        identical = _gf_false; /* RESET the FLAG */
+        ret = glusterd_check_nfs_topology_identical (&identical);
+        if (ret)
+                goto out;
+
+        /* Topology is not changed, but just the options. But write the
+         * options to NFS volfile, so that NFS will be reconfigured.
+         */
+        if (identical) {
+                ret = glusterd_create_nfs_volfile();
+                if (ret == 0) {/* Only if above PASSES */
+                        ret = glusterd_fetchspec_notify (THIS);
+                }
+                goto out;
+        }
+
+        /*
+         * NFS volfile's topology has been changed. NFS server needs
+         * to be RESTARTED to ACT on the changed volfile.
+         */
         ret = glusterd_check_generate_start_nfs ();
 
 out:
@@ -4037,22 +4552,39 @@ out:
 int
 glusterd_restart_bricks (glusterd_conf_t *conf)
 {
+        int                   ret            = 0;
         glusterd_volinfo_t   *volinfo        = NULL;
         glusterd_brickinfo_t *brickinfo      = NULL;
+        glusterd_snap_t      *snap           = NULL;
         gf_boolean_t          start_nodesvcs = _gf_false;
-        int                   ret            = 0;
+        xlator_t             *this           = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
 
         list_for_each_entry (volinfo, &conf->volumes, vol_list) {
                 if (volinfo->status != GLUSTERD_STATUS_STARTED)
                         continue;
                 start_nodesvcs = _gf_true;
-                if (glusterd_is_volume_in_server_quorum (volinfo)) {
-                        //these bricks will be restarted once the quorum is met
-                        continue;
+                gf_log (this->name, GF_LOG_DEBUG, "starting the volume %s",
+                        volinfo->volname);
+                list_for_each_entry (brickinfo, &volinfo->bricks, brick_list) {
+                        glusterd_brick_start (volinfo, brickinfo, _gf_false);
                 }
+        }
 
-                list_for_each_entry (brickinfo, &volinfo->bricks, brick_list) {
-                        glusterd_brick_start (volinfo, brickinfo, _gf_true);
+        list_for_each_entry (snap, &conf->snapshots, snap_list) {
+                list_for_each_entry (volinfo, &snap->volumes, vol_list) {
+                        if (volinfo->status != GLUSTERD_STATUS_STARTED)
+                                continue;
+                        start_nodesvcs = _gf_true;
+                        gf_log (this->name, GF_LOG_DEBUG, "starting the snap "
+                                "volume %s", volinfo->volname);
+                        list_for_each_entry (brickinfo, &volinfo->bricks,
+                                             brick_list) {
+                                glusterd_brick_start (volinfo, brickinfo,
+                                                      _gf_false);
+                        }
                 }
         }
 
@@ -4065,10 +4597,13 @@ glusterd_restart_bricks (glusterd_conf_t *conf)
 int
 _local_gsyncd_start (dict_t *this, char *key, data_t *value, void *data)
 {
+        char                        *path_list = NULL;
         char                        *slave = NULL;
         int                          uuid_len = 0;
+        int                          ret = 0;
         char                         uuid_str[64] = {0};
         glusterd_volinfo_t           *volinfo = NULL;
+        char                         *conf_path = NULL;
 
         volinfo = data;
         GF_ASSERT (volinfo);
@@ -4080,9 +4615,24 @@ _local_gsyncd_start (dict_t *this, char *key, data_t *value, void *data)
         uuid_len = (slave - value->data - 1);
 
         strncpy (uuid_str, (char*)value->data, uuid_len);
-        glusterd_start_gsync (volinfo, slave, uuid_str, NULL);
 
-        return 0;
+        ret = glusterd_get_local_brickpaths (volinfo, &path_list);
+
+        ret = dict_get_str (this, "conf_path", &conf_path);
+        if (ret) {
+                gf_log ("", GF_LOG_ERROR,
+                        "Unable to fetch conf file path.");
+                goto out;
+        }
+
+        glusterd_start_gsync (volinfo, slave, path_list, conf_path,
+                              uuid_str, NULL);
+
+        GF_FREE (path_list);
+        path_list = NULL;
+
+out:
+        return ret;
 }
 
 int
@@ -4131,7 +4681,7 @@ glusterd_get_brickinfo (xlator_t *this, const char *brickname, int port,
         list_for_each_entry (volinfo, &priv->volumes, vol_list) {
                 list_for_each_entry (tmpbrkinfo, &volinfo->bricks,
                                      brick_list) {
-                        if (localhost && !glusterd_is_local_addr (tmpbrkinfo->hostname))
+                        if (localhost && !gf_is_local_addr (tmpbrkinfo->hostname))
                                 continue;
                         if (!strcmp(tmpbrkinfo->path, brickname) &&
                             (tmpbrkinfo->port == port)) {
@@ -4203,26 +4753,27 @@ out:
 }
 
 #ifdef GF_LINUX_HOST_OS
-static int
+int
 glusterd_get_brick_root (char *path, char **mount_point)
 {
         char           *ptr            = NULL;
+        char           *mnt_pt         = NULL;
         struct stat     brickstat      = {0};
         struct stat     buf            = {0};
 
         if (!path)
                 goto err;
-        *mount_point = gf_strdup (path);
-        if (!*mount_point)
+        mnt_pt = gf_strdup (path);
+        if (!mnt_pt)
                 goto err;
-        if (stat (*mount_point, &brickstat))
+        if (stat (mnt_pt, &brickstat))
                 goto err;
 
-        while ((ptr = strrchr (*mount_point, '/')) &&
-               ptr != *mount_point) {
+        while ((ptr = strrchr (mnt_pt, '/')) &&
+               ptr != mnt_pt) {
 
                 *ptr = '\0';
-                if (stat (*mount_point, &buf)) {
+                if (stat (mnt_pt, &buf)) {
                         gf_log (THIS->name, GF_LOG_ERROR, "error in "
                                 "stat: %s", strerror (errno));
                         goto err;
@@ -4234,20 +4785,21 @@ glusterd_get_brick_root (char *path, char **mount_point)
                 }
         }
 
-        if (ptr == *mount_point) {
+        if (ptr == mnt_pt) {
                 if (stat ("/", &buf)) {
                         gf_log (THIS->name, GF_LOG_ERROR, "error in "
                                 "stat: %s", strerror (errno));
                         goto err;
                 }
                 if (brickstat.st_dev == buf.st_dev)
-                        strcpy (*mount_point, "/");
+                        strcpy (mnt_pt, "/");
         }
 
+        *mount_point = mnt_pt;
         return 0;
 
  err:
-        GF_FREE (*mount_point);
+        GF_FREE (mnt_pt);
         return -1;
 }
 
@@ -4369,6 +4921,31 @@ glusterd_add_inode_size_to_dict (dict_t *dict, int count)
         return ret;
 }
 
+struct mntent *
+glusterd_get_mnt_entry_info (char *mnt_pt, FILE *mtab)
+{
+        struct mntent  *entry                = NULL;
+
+        mtab = setmntent (_PATH_MOUNTED, "r");
+        if (!mtab)
+                goto out;
+
+        entry = getmntent (mtab);
+
+        while (1) {
+                if (!entry)
+                        goto out;
+
+                if (!strcmp (entry->mnt_dir, mnt_pt) &&
+                    strcmp (entry->mnt_type, "rootfs"))
+                        break;
+                entry = getmntent (mtab);
+        }
+
+out:
+        return entry;
+}
+
 static int
 glusterd_add_brick_mount_details (glusterd_brickinfo_t *brickinfo,
                                   dict_t *dict, int count)
@@ -4380,8 +4957,8 @@ glusterd_add_brick_mount_details (glusterd_brickinfo_t *brickinfo,
         char           *fs_name              = NULL;
         char           *mnt_options          = NULL;
         char           *device               = NULL;
-        FILE           *mtab                 = NULL;
         struct mntent  *entry                = NULL;
+        FILE           *mtab                 = NULL;
 
         snprintf (base_key, sizeof (base_key), "brick%d", count);
 
@@ -4389,25 +4966,12 @@ glusterd_add_brick_mount_details (glusterd_brickinfo_t *brickinfo,
         if (ret)
                 goto out;
 
-        mtab = setmntent (_PATH_MOUNTED, "r");
-        if (!mtab) {
+        entry = glusterd_get_mnt_entry_info (mnt_pt, mtab);
+        if (!entry) {
                 ret = -1;
                 goto out;
         }
 
-        entry = getmntent (mtab);
-
-        while (1) {
-                if (!entry) {
-                        ret = -1;
-                        goto out;
-                }
-                if (!strcmp (entry->mnt_dir, mnt_pt) &&
-                    strcmp (entry->mnt_type, "rootfs"))
-                        break;
-                entry = getmntent (mtab);
-        }
-
         /* get device file */
         memset (key, 0, sizeof (key));
         snprintf (key, sizeof (key), "%s.device", base_key);
@@ -4440,6 +5004,45 @@ glusterd_add_brick_mount_details (glusterd_brickinfo_t *brickinfo,
 
         return ret;
 }
+
+char*
+glusterd_get_brick_mount_details (glusterd_brickinfo_t *brickinfo)
+{
+        int             ret                  = -1;
+        char           *mnt_pt               = NULL;
+        char           *device               = NULL;
+        FILE           *mtab                 = NULL;
+        struct mntent  *entry                = NULL;
+        xlator_t       *this                 = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (brickinfo);
+
+        ret = glusterd_get_brick_root (brickinfo->path, &mnt_pt);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to get mount point "
+                        "for %s brick", brickinfo->path);
+                goto out;
+        }
+
+        entry = glusterd_get_mnt_entry_info (mnt_pt, mtab);
+        if (NULL == entry) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to get mnt entry "
+                        "for %s mount path", mnt_pt);
+                goto out;
+        }
+
+        /* get the fs_name/device */
+        device = gf_strdup (entry->mnt_fsname);
+
+out:
+        if (NULL != mtab) {
+                endmntent (mtab);
+        }
+
+        return device;
+}
 #endif
 
 int
@@ -4540,7 +5143,6 @@ glusterd_add_brick_to_dict (glusterd_volinfo_t *volinfo,
         char            key[1024]             = {0};
         char            base_key[1024]        = {0};
         char            pidfile[PATH_MAX]     = {0};
-        char            path[PATH_MAX]        = {0};
         xlator_t        *this                 = NULL;
         glusterd_conf_t *priv                 = NULL;
 
@@ -4573,9 +5175,7 @@ glusterd_add_brick_to_dict (glusterd_volinfo_t *volinfo,
         if (ret)
                 goto out;
 
-        GLUSTERD_GET_VOLUME_DIR (path, volinfo, priv);
-        GLUSTERD_GET_BRICK_PIDFILE (pidfile, path, brickinfo->hostname,
-                                    brickinfo->path);
+        GLUSTERD_GET_BRICK_PIDFILE (pidfile, volinfo, brickinfo, priv);
 
         brick_online = glusterd_is_service_running (pidfile, &pid);
 
@@ -4799,10 +5399,11 @@ glusterd_hostname_to_uuid (char *hostname, uuid_t uuid)
 
         ret = glusterd_friend_find_by_hostname (hostname, &peerinfo);
         if (ret) {
-                if (glusterd_is_local_addr (hostname)) {
+                if (gf_is_local_addr (hostname)) {
                         uuid_copy (uuid, MY_UUID);
                         ret = 0;
                 } else {
+                        ret = 0;
                         goto out;
                 }
         } else {
@@ -5118,8 +5719,13 @@ out:
         }
 
         if (*in_use) {
-                snprintf (msg, sizeof (msg), "%s or a prefix of it is "
-                          "already part of a volume", path);
+                if (!strcmp (path, curdir)) {
+                        snprintf (msg, sizeof (msg), "%s is already part of a "
+                          "volume", path);
+                } else {
+                        snprintf (msg, sizeof (msg), "parent directory %s is "
+                          "already part of a volume", curdir);
+                }
         }
 
         if (strlen (msg)) {
@@ -5131,16 +5737,13 @@ out:
 }
 
 int
-glusterd_brick_create_path (char *host, char *path, uuid_t uuid,
-                            char **op_errstr)
+glusterd_check_and_set_brick_xattr (char *host, char *path, uuid_t uuid,
+                                    char **op_errstr, gf_boolean_t is_force)
 {
         int             ret             = -1;
         char            msg[2048]       = {0,};
         gf_boolean_t    in_use          = _gf_false;
-
-        ret = mkdir_p (path, 0777, _gf_true);
-        if (ret)
-                goto out;
+        int             flags           = 0;
 
         /* Check for xattr support in backend fs */
         ret = sys_lsetxattr (path, "trusted.glusterfs.test",
@@ -5154,20 +5757,23 @@ glusterd_brick_create_path (char *host, char *path, uuid_t uuid,
 
         } else {
                 sys_lremovexattr (path, "trusted.glusterfs.test");
-
         }
 
         ret = glusterd_is_path_in_use (path, &in_use, op_errstr);
         if (ret)
                 goto out;
 
-        if (in_use) {
+        if (in_use && !is_force) {
                 ret = -1;
                 goto out;
         }
 
+
+        if (!is_force)
+                flags = XATTR_CREATE;
+
         ret = sys_lsetxattr (path, GF_XATTR_VOL_ID_KEY, uuid, 16,
-                             XATTR_CREATE);
+                             flags);
         if (ret) {
                 snprintf (msg, sizeof (msg), "Failed to set extended "
                           "attributes %s, reason: %s",
@@ -5181,7 +5787,6 @@ out:
                 *op_errstr = gf_strdup (msg);
 
         return ret;
-
 }
 
 int
@@ -5493,11 +6098,15 @@ glusterd_delete_brick (glusterd_volinfo_t* volinfo,
                        glusterd_brickinfo_t *brickinfo)
 {
         int             ret = 0;
+        char      voldir[PATH_MAX] = {0,};
+        glusterd_conf_t *priv = THIS->private;
         GF_ASSERT (volinfo);
         GF_ASSERT (brickinfo);
 
+        GLUSTERD_GET_VOLUME_DIR(voldir, volinfo, priv);
+
         glusterd_delete_volfile (volinfo, brickinfo);
-        glusterd_store_delete_brick (volinfo, brickinfo);
+        glusterd_store_delete_brick (brickinfo, voldir);
         glusterd_brickinfo_delete (brickinfo);
         volinfo->brick_count--;
         return ret;
@@ -5519,12 +6128,92 @@ glusterd_delete_all_bricks (glusterd_volinfo_t* volinfo)
 }
 
 int
+glusterd_get_local_brickpaths (glusterd_volinfo_t *volinfo, char **pathlist)
+{
+        char                 **path_tokens  = NULL;
+        char                  *tmp_path_list = NULL;
+        char                   path[PATH_MAX] = "";
+        int32_t                count          = 0;
+        int32_t                pathlen        = 0;
+        int32_t                total_len      = 0;
+        int32_t                ret            = 0;
+        int                    i              = 0;
+        glusterd_brickinfo_t  *brickinfo      = NULL;
+
+        if ((!volinfo) || (!pathlist))
+            goto out;
+
+        path_tokens = GF_CALLOC (sizeof(char*), volinfo->brick_count,
+                                 gf_gld_mt_charptr);
+        if (!path_tokens) {
+                gf_log ("", GF_LOG_DEBUG, "Could not allocate memory.");
+                ret = -1;
+                goto out;
+        }
+
+        list_for_each_entry (brickinfo, &volinfo->bricks, brick_list) {
+                if (uuid_compare (brickinfo->uuid, MY_UUID))
+                        continue;
+
+                 pathlen = snprintf (path, sizeof(path),
+                                     "--path=%s ", brickinfo->path);
+                 if (pathlen < sizeof(path))
+                        path[pathlen] = '\0';
+                 else
+                        path[sizeof(path)-1] = '\0';
+                 path_tokens[count] = gf_strdup (path);
+                 if (!path_tokens[count]) {
+                        gf_log ("", GF_LOG_DEBUG,
+                                "Could not allocate memory.");
+                        ret = -1;
+                        goto out;
+                 }
+                 count++;
+                 total_len += pathlen;
+        }
+
+        tmp_path_list = GF_CALLOC (sizeof(char), total_len + 1,
+                                   gf_gld_mt_char);
+        if (!tmp_path_list) {
+                gf_log ("", GF_LOG_DEBUG, "Could not allocate memory.");
+                ret = -1;
+                goto out;
+        }
+
+        for (i = 0; i < count; i++)
+                strcat (tmp_path_list, path_tokens[i]);
+
+        if (count)
+                *pathlist = tmp_path_list;
+
+        ret = count;
+out:
+        for (i = 0; i < count; i++) {
+                GF_FREE (path_tokens[i]);
+                path_tokens[i] = NULL;
+        }
+
+        GF_FREE (path_tokens);
+        path_tokens = NULL;
+
+        if (ret == 0) {
+                gf_log ("", GF_LOG_DEBUG, "No Local Bricks Present.");
+                GF_FREE (tmp_path_list);
+                tmp_path_list = NULL;
+        }
+
+        gf_log ("", GF_LOG_DEBUG, "Returning %d", ret);
+        return ret;
+}
+
+int
 glusterd_start_gsync (glusterd_volinfo_t *master_vol, char *slave,
-                      char *glusterd_uuid_str, char **op_errstr)
+                      char *path_list, char *conf_path,
+                      char *glusterd_uuid_str,
+                      char **op_errstr)
 {
         int32_t         ret     = 0;
         int32_t         status  = 0;
-        char            buf[PATH_MAX]   = {0,};
         char            uuid_str [64] = {0};
         runner_t        runner = {0,};
         xlator_t        *this = NULL;
@@ -5537,47 +6226,45 @@ glusterd_start_gsync (glusterd_volinfo_t *master_vol, char *slave,
         GF_ASSERT (priv);
 
         uuid_utoa_r (MY_UUID, uuid_str);
-        if (strcmp (uuid_str, glusterd_uuid_str))
-                goto out;
 
-        ret = gsync_status (master_vol->volname, slave, &status);
-        if (status == 0)
-                goto out;
-
-        snprintf (buf, PATH_MAX, "%s/"GEOREP"/%s", priv->workdir, master_vol->volname);
-        ret = mkdir_p (buf, 0777, _gf_true);
-        if (ret) {
-                errcode = -1;
+        if (!path_list) {
+                ret = 0;
+                gf_log ("", GF_LOG_DEBUG, "No Bricks in this node."
+                        " Not starting gsyncd.");
                 goto out;
         }
 
-        snprintf (buf, PATH_MAX, DEFAULT_LOG_FILE_DIRECTORY"/"GEOREP"/%s",
-                  master_vol->volname);
-        ret = mkdir_p (buf, 0777, _gf_true);
-        if (ret) {
-                errcode = -1;
+        ret = gsync_status (master_vol->volname, slave, conf_path, &status);
+        if (status == 0)
                 goto out;
-        }
 
         uuid_utoa_r (master_vol->volume_id, uuid_str);
         runinit (&runner);
-        runner_add_args  (&runner, GSYNCD_PREFIX"/gsyncd", "-c", NULL);
-        runner_argprintf (&runner, "%s/"GSYNC_CONF, priv->workdir);
+        runner_add_args  (&runner, GSYNCD_PREFIX"/gsyncd",
+                          path_list, "-c", NULL);
+        runner_argprintf (&runner, "%s", conf_path);
         runner_argprintf (&runner, ":%s", master_vol->volname);
         runner_add_args  (&runner, slave, "--config-set", "session-owner",
                           uuid_str, NULL);
+        synclock_unlock (&priv->big_lock);
         ret = runner_run (&runner);
+        synclock_lock (&priv->big_lock);
         if (ret == -1) {
                 errcode = -1;
                 goto out;
         }
 
         runinit (&runner);
-        runner_add_args  (&runner, GSYNCD_PREFIX"/gsyncd", "--monitor", "-c", NULL);
-        runner_argprintf (&runner, "%s/"GSYNC_CONF, priv->workdir);
+        runner_add_args  (&runner, GSYNCD_PREFIX"/gsyncd",
+                          path_list, "--monitor", "-c", NULL);
+        runner_argprintf (&runner, "%s", conf_path);
         runner_argprintf (&runner, ":%s", master_vol->volname);
+        runner_argprintf (&runner, "--glusterd-uuid=%s",
+                          uuid_utoa (priv->uuid));
         runner_add_arg   (&runner, slave);
+        synclock_unlock (&priv->big_lock);
         ret = runner_run (&runner);
+        synclock_lock (&priv->big_lock);
         if (ret == -1) {
                 gf_asprintf (op_errstr, GEOREP" start failed for %s %s",
                              master_vol->volname, slave);
@@ -5589,7 +6276,7 @@ glusterd_start_gsync (glusterd_volinfo_t *master_vol, char *slave,
 out:
         if ((ret != 0) && errcode == -1) {
                 if (op_errstr)
-                        *op_errstr = gf_strdup ("internal error, cannot start"
+                        *op_errstr = gf_strdup ("internal error, cannot start "
                                                 "the " GEOREP " session");
         }
 
@@ -5598,17 +6285,38 @@ out:
 }
 
 int32_t
-glusterd_recreate_bricks (glusterd_conf_t *conf)
+glusterd_recreate_volfiles (glusterd_conf_t *conf)
 {
 
         glusterd_volinfo_t      *volinfo = NULL;
         int                      ret = 0;
+        int                      op_ret = 0;
 
         GF_ASSERT (conf);
         list_for_each_entry (volinfo, &conf->volumes, vol_list) {
                 ret = generate_brick_volfiles (volinfo);
+                if (ret) {
+                        gf_log ("glusterd", GF_LOG_ERROR, "Failed to "
+                                "regenerate brick volfiles for %s",
+                                volinfo->volname);
+                        op_ret = ret;
+                }
+                ret = generate_client_volfiles (volinfo, GF_CLIENT_TRUSTED);
+                if (ret) {
+                        gf_log ("glusterd", GF_LOG_ERROR, "Failed to "
+                                "regenerate trusted client volfiles for %s",
+                                volinfo->volname);
+                        op_ret = ret;
+                }
+                ret = generate_client_volfiles (volinfo, GF_CLIENT_OTHER);
+                if (ret) {
+                        gf_log ("glusterd", GF_LOG_ERROR, "Failed to "
+                                "regenerate client volfiles for %s",
+                                volinfo->volname);
+                        op_ret = ret;
+                }
         }
-        return ret;
+        return op_ret;
 }
 
 int32_t
@@ -5618,7 +6326,7 @@ glusterd_handle_upgrade_downgrade (dict_t *options, glusterd_conf_t *conf)
         char            *type                           = NULL;
         gf_boolean_t     upgrade                        = _gf_false;
         gf_boolean_t     downgrade                      = _gf_false;
-        gf_boolean_t     regenerate_brick_volfiles      = _gf_false;
+        gf_boolean_t     regenerate_volfiles            = _gf_false;
         gf_boolean_t     terminate                      = _gf_false;
 
         ret = dict_get_str (options, "upgrade", &type);
@@ -5631,7 +6339,7 @@ glusterd_handle_upgrade_downgrade (dict_t *options, glusterd_conf_t *conf)
                         goto out;
                 }
                 if (_gf_true == upgrade)
-                        regenerate_brick_volfiles = _gf_true;
+                        regenerate_volfiles = _gf_true;
         }
 
         ret = dict_get_str (options, "downgrade", &type);
@@ -5656,8 +6364,8 @@ glusterd_handle_upgrade_downgrade (dict_t *options, glusterd_conf_t *conf)
                 ret = 0;
         else
                 terminate = _gf_true;
-        if (regenerate_brick_volfiles) {
-                ret = glusterd_recreate_bricks (conf);
+        if (regenerate_volfiles) {
+                ret = glusterd_recreate_volfiles (conf);
         }
 out:
         if (terminate && (ret == 0))
@@ -5732,7 +6440,6 @@ glusterd_brick_statedump (glusterd_volinfo_t *volinfo,
         xlator_t                *this = NULL;
         glusterd_conf_t         *conf = NULL;
         char                    pidfile_path[PATH_MAX] = {0,};
-        char                    path[PATH_MAX] = {0,};
         char                    dumpoptions_path[PATH_MAX] = {0,};
         FILE                    *pidfile = NULL;
         pid_t                   pid = -1;
@@ -5757,9 +6464,7 @@ glusterd_brick_statedump (glusterd_volinfo_t *volinfo,
                 goto out;
         }
 
-        GLUSTERD_GET_VOLUME_DIR (path, volinfo, conf);
-        GLUSTERD_GET_BRICK_PIDFILE (pidfile_path, path, brickinfo->hostname,
-                                    brickinfo->path);
+        GLUSTERD_GET_BRICK_PIDFILE (pidfile_path, volinfo, brickinfo, conf);
 
         pidfile = fopen (pidfile_path, "r");
         if (!pidfile) {
@@ -6043,7 +6748,6 @@ glusterd_restart_rebalance (glusterd_conf_t *conf)
         return ret;
 }
 
-
 void
 glusterd_volinfo_reset_defrag_stats (glusterd_volinfo_t *volinfo)
 {
@@ -6056,6 +6760,7 @@ glusterd_volinfo_reset_defrag_stats (glusterd_volinfo_t *volinfo)
         rebal->lookedup_files = 0;
         rebal->rebalance_failures = 0;
         rebal->rebalance_time = 0;
+        rebal->skipped_files = 0;
 
 }
 
@@ -6152,6 +6857,7 @@ glusterd_defrag_volume_status_update (glusterd_volinfo_t *volinfo,
         uint64_t                        lookup = 0;
         gf_defrag_status_t              status = GF_DEFRAG_STATUS_NOT_STARTED;
         uint64_t                        failures = 0;
+        uint64_t                        skipped = 0;
         xlator_t                       *this = NULL;
         double                          run_time = 0;
 
@@ -6182,6 +6888,11 @@ glusterd_defrag_volume_status_update (glusterd_volinfo_t *volinfo,
                 gf_log (this->name, GF_LOG_TRACE,
                         "failed to get failure count");
 
+        ret = dict_get_uint64 (rsp_dict, "skipped", &skipped);
+        if (ret)
+                gf_log (this->name, GF_LOG_TRACE,
+                        "failed to get skipped count");
+
         ret = dict_get_double (rsp_dict, "run-time", &run_time);
         if (ret)
                 gf_log (this->name, GF_LOG_TRACE,
@@ -6197,6 +6908,8 @@ glusterd_defrag_volume_status_update (glusterd_volinfo_t *volinfo,
                 volinfo->rebal.defrag_status = status;
         if (failures)
                 volinfo->rebal.rebalance_failures = failures;
+        if (skipped)
+                volinfo->rebal.skipped_files = skipped;
         if (run_time)
                 volinfo->rebal.rebalance_time = run_time;
 
@@ -6204,6 +6917,68 @@ glusterd_defrag_volume_status_update (glusterd_volinfo_t *volinfo,
 }
 
 int
+glusterd_check_topology_identical (const char *filename1,
+                                   const char *filename2,
+                                   gf_boolean_t *identical)
+{
+        int                     ret = -1; /* FAILURE */
+        xlator_t                *this = NULL;
+        FILE                    *fp1 = NULL;
+        FILE                    *fp2 = NULL;
+        glusterfs_graph_t       *grph1 = NULL;
+        glusterfs_graph_t       *grph2 = NULL;
+
+        if ((!filename1) || (!filename2) || (!identical))
+                goto out;
+
+        this = THIS;
+
+        errno = 0; /* RESET the errno */
+
+        /* fopen() the volfile1 to create the graph */
+        fp1 = fopen (filename1, "r");
+        if (fp1 == NULL) {
+                gf_log (this->name, GF_LOG_ERROR, "fopen() on file: %s failed "
+                        "(%s)", filename1, strerror (errno));
+                goto out;
+        }
+
+        /* fopen() the volfile2 to create the graph */
+        fp2 = fopen (filename2, "r");
+        if (fp2 == NULL) {
+                gf_log (this->name, GF_LOG_ERROR, "fopen() on file: %s failed "
+                        "(%s)", filename2, strerror (errno));
+                goto out;
+        }
+
+        /* create the graph for filename1 */
+        grph1 = glusterfs_graph_construct(fp1);
+        if (grph1 == NULL)
+                goto out;
+
+        /* create the graph for filename2 */
+        grph2 = glusterfs_graph_construct(fp2);
+        if (grph2 == NULL)
+                goto out;
+
+        /* compare the graph topology */
+        *identical = is_graph_topology_equal(grph1, grph2);
+        ret = 0; /* SUCCESS */
+out:
+        if (fp1)
+                fclose(fp1);
+        if (fp2)
+                fclose(fp2);
+        if (grph1)
+                glusterfs_graph_destroy(grph1);
+        if (grph2)
+                glusterfs_graph_destroy(grph2);
+
+        gf_log (this->name, GF_LOG_DEBUG, "Returning with %d", ret);
+        return ret;
+}
+
+int
 glusterd_check_files_identical (char *filename1, char *filename2,
                                 gf_boolean_t *identical)
 {
@@ -6463,6 +7238,7 @@ glusterd_gsync_use_rsp_dict (dict_t *aggr, dict_t *rsp_dict, char *op_errstr)
 {
         dict_t             *ctx = NULL;
         int                ret = 0;
+        char               *conf_path = NULL;
 
         if (aggr) {
                 ctx = aggr;
@@ -6484,6 +7260,17 @@ glusterd_gsync_use_rsp_dict (dict_t *aggr, dict_t *rsp_dict, char *op_errstr)
                 ret = glusterd_append_gsync_status (ctx, rsp_dict);
                 if (ret)
                         goto out;
+
+                ret = dict_get_str (rsp_dict, "conf_path", &conf_path);
+                if (!ret && conf_path) {
+                        ret = dict_set_dynstr (ctx, "conf_path",
+                                            gf_strdup(conf_path));
+                        if (ret) {
+                                gf_log ("", GF_LOG_ERROR,
+                                        "Unable to store conf path.");
+                                goto out;
+                        }
+                }
         }
         if ((op_errstr) && (strcmp ("", op_errstr))) {
                 ret = dict_set_dynstr (ctx, "errstr", gf_strdup(op_errstr));
@@ -6704,7 +7491,7 @@ glusterd_volume_status_copy_to_op_ctx_dict (dict_t *aggr, dict_t *rsp_dict)
         if (ret)
                 goto out;
 
-        if (cmd & GF_CLI_STATUS_ALL && is_origin_glusterd ()) {
+        if (cmd & GF_CLI_STATUS_ALL && is_origin_glusterd (ctx_dict)) {
                 ret = dict_get_int32 (rsp_dict, "vol_count", &vol_count);
                 if (ret == 0) {
                         ret = dict_set_int32 (ctx_dict, "vol_count",
@@ -6726,6 +7513,12 @@ glusterd_volume_status_copy_to_op_ctx_dict (dict_t *aggr, dict_t *rsp_dict)
                 }
         }
 
+        if ((cmd & GF_CLI_STATUS_TASKS) != 0) {
+                dict_copy (rsp_dict, aggr);
+                ret = 0;
+                goto out;
+        }
+
         ret = dict_get_int32 (rsp_dict, "count", &rsp_node_count);
         if (ret) {
                 ret = 0; //no bricks in the rsp
@@ -6795,6 +7588,7 @@ glusterd_volume_rebalance_use_rsp_dict (dict_t *aggr, dict_t *rsp_dict)
         int32_t              current_index = 2;
         int32_t              value32       = 0;
         uint64_t             value         = 0;
+        char                *peer_uuid_str = NULL;
 
         GF_ASSERT (rsp_dict);
         conf = THIS->private;
@@ -6837,9 +7631,10 @@ glusterd_volume_rebalance_use_rsp_dict (dict_t *aggr, dict_t *rsp_dict)
 
                 /* Finding the index of the node-uuid in the peer-list */
                 list_for_each_entry (peerinfo, &conf->peers, uuid_list) {
-                        if (!strcmp(peerinfo->uuid_str, node_uuid_str)){
+                        peer_uuid_str = gd_peer_uuid_str (peerinfo);
+                        if (strcmp (peer_uuid_str, node_uuid_str) == 0)
                                 break;
-                        }
+
                         current_index++;
                 }
 
@@ -6926,6 +7721,18 @@ glusterd_volume_rebalance_use_rsp_dict (dict_t *aggr, dict_t *rsp_dict)
         }
 
         memset (key, 0, 256);
+        snprintf (key, 256, "skipped-%d", index);
+        ret = dict_get_uint64 (rsp_dict, key, &value);
+        if (!ret) {
+                memset (key, 0, 256);
+                snprintf (key, 256, "skipped-%d", current_index);
+                ret = dict_set_uint64 (ctx_dict, key, value);
+                if (ret) {
+                        gf_log (THIS->name, GF_LOG_DEBUG,
+                                "failed to set skipped count");
+                }
+        }
+        memset (key, 0, 256);
         snprintf (key, 256, "run-time-%d", index);
         ret = dict_get_double (rsp_dict, key, &elapsed_time);
         if (!ret) {
@@ -6945,6 +7752,334 @@ out:
 }
 
 int
+glusterd_snap_config_use_rsp_dict (dict_t *dst, dict_t *src)
+{
+        char           buf[PATH_MAX]        = "";
+        char          *volname              = NULL;
+        int            ret                  = -1;
+        int            config_command       = 0;
+        uint64_t       i                    = 0;
+        uint64_t       value                = 0;
+        uint64_t       voldisplaycount      = 0;
+
+        if (!dst || !src) {
+                gf_log ("", GF_LOG_ERROR, "Source or Destination "
+                        "dict is empty.");
+                goto out;
+        }
+
+        ret = dict_get_int32 (dst, "config-command", &config_command);
+        if (ret) {
+                gf_log ("", GF_LOG_ERROR,
+                        "failed to get config-command type");
+                goto out;
+        }
+
+        switch (config_command) {
+        case GF_SNAP_CONFIG_DISPLAY:
+                ret = dict_get_uint64 (src, "snap-max-hard-limit", &value);
+                if (!ret) {
+                        ret = dict_set_uint64 (dst, "snap-max-hard-limit", value);
+                        if (ret) {
+                                gf_log ("", GF_LOG_ERROR,
+                                        "Unable to set snap_max_hard_limit");
+                                goto out;
+                        }
+                } else {
+                        /* Received dummy response from other nodes */
+                        ret = 0;
+                        goto out;
+                }
+
+                ret = dict_get_uint64 (src, "snap-max-soft-limit", &value);
+                if (ret) {
+                        gf_log ("", GF_LOG_ERROR,
+                                "Unable to get snap_max_soft_limit");
+                        goto out;
+                }
+
+                ret = dict_set_uint64 (dst, "snap-max-soft-limit", value);
+                if (ret) {
+                        gf_log ("", GF_LOG_ERROR,
+                                "Unable to set snap_max_soft_limit");
+                        goto out;
+                }
+
+                ret = dict_get_uint64 (src, "voldisplaycount",
+                                       &voldisplaycount);
+                if (ret) {
+                        gf_log ("", GF_LOG_ERROR,
+                                "Unable to get voldisplaycount");
+                        goto out;
+                }
+
+                ret = dict_set_uint64 (dst, "voldisplaycount",
+                                       voldisplaycount);
+                if (ret) {
+                        gf_log ("", GF_LOG_ERROR,
+                                "Unable to set voldisplaycount");
+                        goto out;
+                }
+
+                for (i = 0; i < voldisplaycount; i++) {
+                        snprintf (buf, sizeof(buf), "volume%ld-volname", i);
+                        ret = dict_get_str (src, buf, &volname);
+                        if (ret) {
+                                gf_log ("", GF_LOG_ERROR,
+                                        "Unable to get %s", buf);
+                                goto out;
+                        }
+                        ret = dict_set_str (dst, buf, volname);
+                        if (ret) {
+                                gf_log ("", GF_LOG_ERROR,
+                                        "Unable to set %s", buf);
+                                goto out;
+                        }
+
+                        snprintf (buf, sizeof(buf),
+                                  "volume%ld-snap-max-hard-limit", i);
+                        ret = dict_get_uint64 (src, buf, &value);
+                        if (ret) {
+                                gf_log ("", GF_LOG_ERROR,
+                                        "Unable to get %s", buf);
+                                goto out;
+                        }
+                        ret = dict_set_uint64 (dst, buf, value);
+                        if (ret) {
+                                gf_log ("", GF_LOG_ERROR,
+                                        "Unable to set %s", buf);
+                                goto out;
+                        }
+
+                        snprintf (buf, sizeof(buf),
+                                  "volume%ld-active-hard-limit", i);
+                        ret = dict_get_uint64 (src, buf, &value);
+                        if (ret) {
+                                gf_log ("", GF_LOG_ERROR,
+                                        "Unable to get %s", buf);
+                                goto out;
+                        }
+                        ret = dict_set_uint64 (dst, buf, value);
+                        if (ret) {
+                                gf_log ("", GF_LOG_ERROR,
+                                        "Unable to set %s", buf);
+                                goto out;
+                        }
+
+                        snprintf (buf, sizeof(buf),
+                                  "volume%ld-snap-max-soft-limit", i);
+                        ret = dict_get_uint64 (src, buf, &value);
+                        if (ret) {
+                                gf_log ("", GF_LOG_ERROR,
+                                        "Unable to get %s", buf);
+                                goto out;
+                        }
+                        ret = dict_set_uint64 (dst, buf, value);
+                        if (ret) {
+                                gf_log ("", GF_LOG_ERROR,
+                                        "Unable to set %s", buf);
+                                goto out;
+                        }
+                }
+
+                break;
+        default:
+                break;
+        }
+
+        ret = 0;
+out:
+        gf_log ("", GF_LOG_DEBUG, "Returning %d", ret);
+        return ret;
+}
+
+/* Aggregate missed_snap_counts from different nodes and save it *
+ * in the req_dict of the originator node */
+int
+glusterd_snap_create_use_rsp_dict (dict_t *dst, dict_t *src)
+{
+        char          *buf                      = NULL;
+        char          *tmp_str                  = NULL;
+        char           name_buf[PATH_MAX]       = "";
+        int32_t        i                        = -1;
+        int32_t        ret                      = -1;
+        int32_t        src_missed_snap_count    = -1;
+        int32_t        dst_missed_snap_count    = -1;
+        xlator_t      *this                     = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+
+        if (!dst || !src) {
+                gf_log (this->name, GF_LOG_ERROR, "Source or Destination "
+                        "dict is empty.");
+                goto out;
+        }
+
+        ret = dict_get_int32 (src, "missed_snap_count",
+                              &src_missed_snap_count);
+        if (ret) {
+                gf_log (this->name, GF_LOG_DEBUG, "No missed snaps");
+                ret = 0;
+                goto out;
+        }
+
+        ret = dict_get_int32 (dst, "missed_snap_count",
+                              &dst_missed_snap_count);
+        if (ret) {
+                /* Initialize dst_missed_count for the first time */
+                dst_missed_snap_count = 0;
+        }
+
+        for (i = 0; i < src_missed_snap_count; i++) {
+                 snprintf (name_buf, sizeof(name_buf), "missed_snaps_%d",
+                           i);
+                 ret = dict_get_str (src, name_buf, &buf);
+                 if (ret) {
+                         gf_log (this->name, GF_LOG_ERROR,
+                                 "Unable to fetch %s", name_buf);
+                         goto out;
+                 }
+
+                 snprintf (name_buf, sizeof(name_buf), "missed_snaps_%d",
+                           dst_missed_snap_count);
+
+                 tmp_str = gf_strdup (buf);
+                 if (!tmp_str) {
+                         ret = -1;
+                         goto out;
+                 }
+
+                 ret = dict_set_dynstr (dst, name_buf, tmp_str);
+                 if (ret) {
+                         gf_log (this->name, GF_LOG_ERROR,
+                                 "Unable to set %s", name_buf);
+                         goto out;
+                 }
+
+                 tmp_str = NULL;
+                 dst_missed_snap_count++;
+        }
+
+        ret = dict_set_int32 (dst, "missed_snap_count", dst_missed_snap_count);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Unable to set dst_missed_snap_count");
+                goto out;
+        }
+
+out:
+        if (ret && tmp_str)
+                GF_FREE(tmp_str);
+
+        gf_log (this->name, GF_LOG_TRACE, "Returning %d", ret);
+        return ret;
+}
+
+int
+glusterd_snap_use_rsp_dict (dict_t *dst, dict_t *src)
+{
+        int            ret            = -1;
+        int32_t        snap_command   = 0;
+
+        if (!dst || !src) {
+                gf_log ("", GF_LOG_ERROR, "Source or Destination "
+                        "dict is empty.");
+                goto out;
+        }
+
+        ret = dict_get_int32 (dst, "type", &snap_command);
+        if (ret) {
+                gf_log ("", GF_LOG_ERROR, "unable to get the type of "
+                        "the snapshot command");
+                goto out;
+        }
+
+        switch (snap_command) {
+        case GF_SNAP_OPTION_TYPE_CREATE:
+        case GF_SNAP_OPTION_TYPE_DELETE:
+                ret = glusterd_snap_create_use_rsp_dict (dst, src);
+                if (ret) {
+                        gf_log ("", GF_LOG_ERROR, "Unable to use rsp dict");
+                        goto out;
+                }
+                break;
+        case GF_SNAP_OPTION_TYPE_CONFIG:
+                ret = glusterd_snap_config_use_rsp_dict (dst, src);
+                if (ret) {
+                        gf_log ("", GF_LOG_ERROR, "Unable to use rsp dict");
+                        goto out;
+                }
+                break;
+        default:
+                // copy the response dictinary's contents to the dict to be
+                // sent back to the cli
+                dict_copy (src, dst);
+                break;
+        }
+
+        ret = 0;
+out:
+        gf_log ("", GF_LOG_DEBUG, "Returning %d", ret);
+        return ret;
+}
+
+int
+glusterd_sys_exec_output_rsp_dict (dict_t *dst, dict_t *src)
+{
+        char           output_name[PATH_MAX] = "";
+        char          *output = NULL;
+        int            ret      = 0;
+        int            i      = 0;
+        int            len    = 0;
+        int            src_output_count      = 0;
+        int            dst_output_count      = 0;
+
+        if (!dst || !src) {
+                gf_log ("", GF_LOG_ERROR, "Source or Destination "
+                        "dict is empty.");
+                goto out;
+        }
+
+        ret = dict_get_int32 (dst, "output_count", &dst_output_count);
+
+        ret = dict_get_int32 (src, "output_count", &src_output_count);
+        if (ret) {
+                gf_log ("", GF_LOG_DEBUG, "No output from source");
+                ret = 0;
+                goto out;
+        }
+
+        for (i = 1; i <= src_output_count; i++) {
+                len = snprintf (output_name, sizeof(output_name) - 1,
+                                "output_%d", i);
+                output_name[len] = '\0';
+                ret = dict_get_str (src, output_name, &output);
+                if (ret) {
+                        gf_log ("", GF_LOG_ERROR, "Unable to fetch %s",
+                                output_name);
+                        goto out;
+                }
+
+                len = snprintf (output_name, sizeof(output_name) - 1,
+                                "output_%d", i+dst_output_count);
+                output_name[len] = '\0';
+                ret = dict_set_dynstr (dst, output_name, gf_strdup (output));
+                if (ret) {
+                        gf_log ("", GF_LOG_ERROR, "Unable to set %s",
+                                output_name);
+                        goto out;
+                }
+        }
+
+        ret = dict_set_int32 (dst, "output_count",
+                              dst_output_count+src_output_count);
+out:
+        gf_log ("", GF_LOG_DEBUG, "Returning %d", ret);
+        return ret;
+}
+
+int
 glusterd_use_rsp_dict (dict_t *aggr, dict_t *rsp_dict)
 {
         int            ret      = 0;
@@ -7117,6 +8252,77 @@ out:
 }
 
 int
+_heal_volume_add_shd_rsp_of_statistics (dict_t *this, char *key, data_t
+                                             *value, void *data)
+{
+        char                            new_key[256] = {0,};
+        char                            int_str[16] = {0,};
+        char                            key_begin_string[128] = {0,};
+        data_t                          *new_value = NULL;
+        char                            *rxl_end = NULL;
+        char                            *rxl_child_end = NULL;
+        glusterd_volinfo_t              *volinfo = NULL;
+        char                            *key_begin_str = NULL;
+        int                             rxl_id = 0;
+        int                             rxl_child_id = 0;
+        int                             brick_id = 0;
+        int                             int_len = 0;
+        int                             ret = 0;
+        glusterd_heal_rsp_conv_t        *rsp_ctx = NULL;
+        glusterd_brickinfo_t            *brickinfo = NULL;
+
+        rsp_ctx = data;
+        key_begin_str = strchr (key, '-');
+        if (!key_begin_str)
+                goto out;
+
+        int_len = strlen (key) - strlen (key_begin_str);
+        strncpy (key_begin_string, key, int_len);
+        key_begin_string[int_len] = '\0';
+
+        rxl_end = strchr (key_begin_str + 1, '-');
+        if (!rxl_end)
+                goto out;
+
+        int_len = strlen (key_begin_str) - strlen (rxl_end) - 1;
+        strncpy (int_str, key_begin_str + 1, int_len);
+        int_str[int_len] = '\0';
+        ret = gf_string2int (int_str, &rxl_id);
+        if (ret)
+                goto out;
+
+
+        rxl_child_end = strchr (rxl_end + 1, '-');
+        if (!rxl_child_end)
+                goto out;
+
+        int_len = strlen (rxl_end) - strlen (rxl_child_end) - 1;
+        strncpy (int_str, rxl_end + 1, int_len);
+        int_str[int_len] = '\0';
+        ret = gf_string2int (int_str, &rxl_child_id);
+        if (ret)
+                goto out;
+
+        volinfo = rsp_ctx->volinfo;
+        brick_id = rxl_id * volinfo->replica_count + rxl_child_id;
+
+        brickinfo = glusterd_get_brickinfo_by_position (volinfo, brick_id);
+        if (!brickinfo)
+                goto out;
+        if (!glusterd_is_local_brick (rsp_ctx->this, volinfo, brickinfo))
+                goto out;
+
+        new_value = data_copy (value);
+        snprintf (new_key, sizeof (new_key), "%s-%d%s", key_begin_string,
+                  brick_id, rxl_child_end);
+        dict_set (rsp_ctx->dict, new_key, new_value);
+
+out:
+        return 0;
+
+}
+
+int
 glusterd_heal_volume_brick_rsp (dict_t *req_dict, dict_t *rsp_dict,
                                 dict_t *op_ctx, char **op_errstr)
 {
@@ -7124,6 +8330,7 @@ glusterd_heal_volume_brick_rsp (dict_t *req_dict, dict_t *rsp_dict,
         glusterd_heal_rsp_conv_t        rsp_ctx = {0};
         char                            *volname = NULL;
         glusterd_volinfo_t              *volinfo = NULL;
+        int                             heal_op = -1;
 
         GF_ASSERT (rsp_dict);
         GF_ASSERT (op_ctx);
@@ -7135,6 +8342,13 @@ glusterd_heal_volume_brick_rsp (dict_t *req_dict, dict_t *rsp_dict,
                 goto out;
         }
 
+        ret = dict_get_int32 (req_dict, "heal-op", &heal_op);
+        if (ret) {
+                gf_log ("", GF_LOG_ERROR, "Unable to get heal_op");
+                goto out;
+        }
+
+
         ret  = glusterd_volinfo_find (volname, &volinfo);
 
         if (ret)
@@ -7143,7 +8357,12 @@ glusterd_heal_volume_brick_rsp (dict_t *req_dict, dict_t *rsp_dict,
         rsp_ctx.dict = op_ctx;
         rsp_ctx.volinfo = volinfo;
         rsp_ctx.this = THIS;
-        dict_foreach (rsp_dict, _heal_volume_add_shd_rsp, &rsp_ctx);
+        if (heal_op == GF_AFR_OP_STATISTICS)
+                dict_foreach (rsp_dict, _heal_volume_add_shd_rsp_of_statistics,
+                              &rsp_ctx);
+        else
+                dict_foreach (rsp_dict, _heal_volume_add_shd_rsp, &rsp_ctx);
+
 
 out:
         return ret;
@@ -7288,6 +8507,13 @@ glusterd_defrag_volume_node_rsp (dict_t *req_dict, dict_t *rsp_dict,
                 gf_log (THIS->name, GF_LOG_ERROR,
                         "failed to set failure count");
 
+        memset (key, 0 , 256);
+        snprintf (key, 256, "skipped-%d", i);
+        ret = dict_set_uint64 (op_ctx, key, volinfo->rebal.skipped_files);
+        if (ret)
+                gf_log (THIS->name, GF_LOG_ERROR,
+                        "failed to set skipped count");
+
         memset (key, 0, 256);
         snprintf (key, 256, "run-time-%d", i);
         ret = dict_set_double (op_ctx, key, volinfo->rebal.rebalance_time);
@@ -7339,16 +8565,31 @@ glusterd_handle_node_rsp (dict_t *req_dict, void *pending_entry,
  * time a lock_owner is set
  */
 gf_boolean_t
-is_origin_glusterd ()
+is_origin_glusterd (dict_t *dict)
 {
-        int     ret = 0;
-        uuid_t  lock_owner = {0,};
+        gf_boolean_t  ret              = _gf_false;
+        uuid_t        lock_owner       = {0,};
+        uuid_t        *originator_uuid = NULL;
 
-        ret = glusterd_get_lock_owner (&lock_owner);
-        if (ret)
-                return _gf_false;
+        GF_ASSERT (dict);
 
-        return (uuid_compare (MY_UUID, lock_owner) == 0);
+        ret = dict_get_bin (dict, "originator_uuid",
+                            (void **) &originator_uuid);
+        if (ret) {
+                /* If not originator_uuid has been set, then the command
+                 * has been originated from a glusterd running on older version
+                 * Hence fetching the lock owner */
+                ret = glusterd_get_lock_owner (&lock_owner);
+                if (ret) {
+                        ret = _gf_false;
+                        goto out;
+                }
+                ret = !uuid_compare (MY_UUID, lock_owner);
+        } else
+                ret = !uuid_compare (MY_UUID, *originator_uuid);
+
+out:
+        return ret;
 }
 
 int
@@ -7411,50 +8652,243 @@ glusterd_copy_uuid_to_dict (uuid_t uuid, dict_t *dict, char *key)
         return 0;
 }
 
-gf_boolean_t
-glusterd_is_same_address (char *name1, char *name2)
+int
+_update_volume_op_versions (dict_t *this, char *key, data_t *value, void *data)
 {
-        struct addrinfo         *addr1 = NULL;
-        struct addrinfo         *addr2 = NULL;
-        struct addrinfo         *p = NULL;       
-        struct addrinfo         *q = NULL;       
-        gf_boolean_t            ret = _gf_false;
-        int                     gai_err = 0;
+        int                op_version = 0;
+        glusterd_volinfo_t *ctx       = NULL;
+        gf_boolean_t       enabled    = _gf_true;
+        int                ret        = -1;
 
-        gai_err = getaddrinfo(name1,NULL,NULL,&addr1);
-        if (gai_err != 0) {
-                gf_log (name1, GF_LOG_WARNING,
-                        "error in getaddrinfo: %s\n", gai_strerror(gai_err));
-                goto out;
+        GF_ASSERT (data);
+        ctx = data;
+
+        op_version = glusterd_get_op_version_for_key (key);
+
+        if (gd_is_xlator_option (key) || gd_is_boolean_option (key)) {
+                ret = gf_string2boolean (value->data, &enabled);
+                if (ret)
+                        return 0;
+
+                if (!enabled)
+                        return 0;
         }
 
-        gai_err = getaddrinfo(name2,NULL,NULL,&addr2);
-        if (gai_err != 0) {
-                gf_log (name2, GF_LOG_WARNING,
-                        "error in getaddrinfo: %s\n", gai_strerror(gai_err));
-                goto out;
+        if (op_version > ctx->op_version)
+                ctx->op_version = op_version;
+
+        if (gd_is_client_option (key) &&
+            (op_version > ctx->client_op_version))
+                ctx->client_op_version = op_version;
+
+        return 0;
+}
+
+void
+gd_update_volume_op_versions (glusterd_volinfo_t *volinfo)
+{
+        glusterd_conf_t *conf = NULL;
+        gf_boolean_t    ob_enabled = _gf_false;
+
+        GF_ASSERT (volinfo);
+
+        conf = THIS->private;
+        GF_ASSERT (conf);
+
+        /* Reset op-versions to minimum */
+        volinfo->op_version = 1;
+        volinfo->client_op_version = 1;
+
+        dict_foreach (volinfo->dict, _update_volume_op_versions, volinfo);
+
+        /* Special case for open-behind
+         * If cluster op-version >= 2 and open-behind hasn't been explicitly
+         * disabled, volume op-versions must be updated to account for it
+         */
+
+        /* TODO: Remove once we have a general way to update automatically
+         * enabled features
+         */
+        if (conf->op_version >= 2) {
+                ob_enabled = dict_get_str_boolean (volinfo->dict,
+                                                   "performance.open-behind",
+                                                   _gf_true);
+                if (ob_enabled) {
+
+                        if (volinfo->op_version < 2)
+                                volinfo->op_version = 2;
+                        if (volinfo->client_op_version < 2)
+                                volinfo->client_op_version = 2;
+                }
         }
 
-        for (p = addr1; p; p = p->ai_next) {
-                for (q = addr2; q; q = q->ai_next) {
-                        if (p->ai_addrlen != q->ai_addrlen) {
-                                continue;
-                        }
-                        if (memcmp(p->ai_addr,q->ai_addr,p->ai_addrlen)) {
+        return;
+}
+
+/* A task is committed/completed once the task-id for it is cleared */
+gf_boolean_t
+gd_is_remove_brick_committed (glusterd_volinfo_t *volinfo)
+{
+        GF_ASSERT (volinfo);
+
+        if ((GD_OP_REMOVE_BRICK == volinfo->rebal.op) &&
+            !uuid_is_null (volinfo->rebal.rebalance_id))
+                        return _gf_false;
+
+        return _gf_true;
+}
+
+gf_boolean_t
+glusterd_are_vol_all_peers_up (glusterd_volinfo_t *volinfo,
+                               struct list_head *peers,
+                               char **down_peerstr)
+{
+        glusterd_peerinfo_t   *peerinfo  = NULL;
+        glusterd_brickinfo_t  *brickinfo = NULL;
+        gf_boolean_t           ret       = _gf_false;
+
+        list_for_each_entry (brickinfo, &volinfo->bricks, brick_list) {
+                if (!uuid_compare (brickinfo->uuid, MY_UUID))
+                        continue;
+
+                list_for_each_entry (peerinfo, peers, uuid_list) {
+                        if (uuid_compare (peerinfo->uuid, brickinfo->uuid))
                                 continue;
+
+                        /*Found peer who owns the brick, return false
+                         * if peer is not connected or not friend */
+                        if (!(peerinfo->connected) ||
+                           (peerinfo->state.state !=
+                             GD_FRIEND_STATE_BEFRIENDED)) {
+                                *down_peerstr = gf_strdup (peerinfo->hostname);
+                                gf_log ("", GF_LOG_DEBUG, "Peer %s is down. ",
+                                        peerinfo->hostname);
+                                goto out;
                         }
-                        ret = _gf_true;
-                        goto out;
                 }
-        }
+       }
 
+        ret = _gf_true;
 out:
-        if (addr1) {
-                freeaddrinfo(addr1);
-        }
-        if (addr2) {
-                freeaddrinfo(addr2);
+        gf_log ("", GF_LOG_DEBUG, "Returning %d", ret);
+        return ret;
+}
+
+gf_boolean_t
+glusterd_is_status_tasks_op (glusterd_op_t op, dict_t *dict)
+{
+        int           ret             = -1;
+        uint32_t      cmd             = GF_CLI_STATUS_NONE;
+        gf_boolean_t  is_status_tasks = _gf_false;
+
+        if (op != GD_OP_STATUS_VOLUME)
+                goto out;
+
+        ret = dict_get_uint32 (dict, "cmd", &cmd);
+        if (ret) {
+                gf_log (THIS->name, GF_LOG_ERROR, "Failed to get opcode");
+                goto out;
         }
+
+        if (cmd & GF_CLI_STATUS_TASKS)
+                is_status_tasks = _gf_true;
+
+out:
+        return is_status_tasks;
+}
+
+int
+glusterd_compare_snap_time(struct list_head *list1, struct list_head *list2)
+{
+        glusterd_snap_t *snap1 = NULL;
+        glusterd_snap_t *snap2 = NULL;
+        double diff_time       = 0;
+
+        GF_ASSERT (list1);
+        GF_ASSERT (list2);
+
+        snap1 = list_entry(list1, glusterd_snap_t, snap_list);
+        snap2 = list_entry(list2, glusterd_snap_t, snap_list);
+        diff_time = difftime(snap1->time_stamp, snap2->time_stamp);
+
+        return ((int)diff_time);
+}
+
+int
+glusterd_compare_snap_vol_time(struct list_head *list1, struct list_head *list2)
+{
+        glusterd_volinfo_t *snapvol1 = NULL;
+        glusterd_volinfo_t *snapvol2 = NULL;
+        double diff_time             = 0;
+
+        GF_ASSERT (list1);
+        GF_ASSERT (list2);
+
+        snapvol1 = list_entry(list1, glusterd_volinfo_t, snapvol_list);
+        snapvol2 = list_entry(list2, glusterd_volinfo_t, snapvol_list);
+        diff_time = difftime(snapvol1->snapshot->time_stamp,
+                             snapvol2->snapshot->time_stamp);
+
+        return ((int)diff_time);
+}
+
+int32_t
+glusterd_missed_snapinfo_new (glusterd_missed_snap_info **missed_snapinfo)
+{
+        glusterd_missed_snap_info      *new_missed_snapinfo = NULL;
+        int32_t                         ret                 = -1;
+        xlator_t                       *this                = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (missed_snapinfo);
+
+        new_missed_snapinfo = GF_CALLOC (1, sizeof(*new_missed_snapinfo),
+                                         gf_gld_mt_missed_snapinfo_t);
+
+        if (!new_missed_snapinfo)
+                goto out;
+
+        new_missed_snapinfo->node_snap_info = NULL;
+        INIT_LIST_HEAD (&new_missed_snapinfo->missed_snaps);
+        INIT_LIST_HEAD (&new_missed_snapinfo->snap_ops);
+
+        *missed_snapinfo = new_missed_snapinfo;
+
+        ret = 0;
+
+out:
+        gf_log (this->name, GF_LOG_TRACE, "Returning %d", ret);
         return ret;
+}
+
+int32_t
+glusterd_missed_snap_op_new (glusterd_snap_op_t **snap_op)
+{
+        glusterd_snap_op_t      *new_snap_op = NULL;
+        int32_t                  ret         = -1;
+        xlator_t                *this        = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (snap_op);
 
+        new_snap_op = GF_CALLOC (1, sizeof(*new_snap_op),
+                                 gf_gld_mt_missed_snapinfo_t);
+
+        if (!new_snap_op)
+                goto out;
+
+        new_snap_op->brick_path = NULL;
+        new_snap_op->brick_num = -1;
+        new_snap_op->op = -1;
+        new_snap_op->status = -1;
+        INIT_LIST_HEAD (&new_snap_op->snap_ops_list);
+
+        *snap_op = new_snap_op;
+
+        ret = 0;
+out:
+        gf_log (this->name, GF_LOG_TRACE, "Returning %d", ret);
+        return ret;
 }
diff --git a/xlators/mgmt/glusterd/src/glusterd-utils.h b/xlators/mgmt/glusterd/src/glusterd-utils.h
index c7fbe447e..56bb799bf 100644
--- a/xlators/mgmt/glusterd/src/glusterd-utils.h
+++ b/xlators/mgmt/glusterd/src/glusterd-utils.h
@@ -81,6 +81,11 @@ glusterd_submit_request (struct rpc_clnt *rpc, void *req,
 int32_t
 glusterd_volinfo_new (glusterd_volinfo_t **volinfo);
 
+int32_t
+glusterd_volinfo_dup (glusterd_volinfo_t *volinfo,
+                      glusterd_volinfo_t **dup_volinfo,
+                      gf_boolean_t set_userauth);
+
 char *
 glusterd_auth_get_username (glusterd_volinfo_t *volinfo);
 
@@ -115,8 +120,23 @@ int32_t
 glusterd_peer_hostname_new (char *hostname, glusterd_peer_hostname_t **name);
 
 int32_t
+glusterd_snap_volinfo_find (char *volname, glusterd_snap_t *snap,
+                            glusterd_volinfo_t **volinfo);
+int32_t
+glusterd_snap_volinfo_find_from_parent_volname (char *origin_volname,
+                                      glusterd_snap_t *snap,
+                                      glusterd_volinfo_t **volinfo);
+
+int32_t
 glusterd_volinfo_find (char *volname, glusterd_volinfo_t **volinfo);
 
+int
+glusterd_volinfo_find_by_volume_id (uuid_t volume_id, glusterd_volinfo_t **volinfo);
+
+int
+glusterd_snap_volinfo_find_by_volume_id (uuid_t volume_id,
+                                         glusterd_volinfo_t **volinfo);
+
 int32_t
 glusterd_service_stop(const char *service, char *pidfile, int sig,
                       gf_boolean_t force_kill);
@@ -148,14 +168,11 @@ glusterd_volume_brickinfo_get_by_brick (char *brick,
                                         glusterd_volinfo_t *volinfo,
                                         glusterd_brickinfo_t **brickinfo);
 
-gf_boolean_t
-glusterd_is_local_addr (char *hostname);
-
 int32_t
 glusterd_build_volume_dict (dict_t **vols);
 
 int32_t
-glusterd_compare_friend_data (dict_t  *vols, int32_t *status);
+glusterd_compare_friend_data (dict_t  *vols, int32_t *status, char *hostname);
 
 int
 glusterd_volume_compute_cksum (glusterd_volinfo_t  *volinfo);
@@ -282,6 +299,7 @@ glusterd_is_defrag_on (glusterd_volinfo_t *volinfo);
 
 int32_t
 glusterd_volinfo_bricks_delete (glusterd_volinfo_t *volinfo);
+
 int
 glusterd_friend_find_by_uuid (uuid_t uuid,
                               glusterd_peerinfo_t  **peerinfo);
@@ -317,8 +335,13 @@ glusterd_rb_check_bricks (glusterd_volinfo_t *volinfo,
                           glusterd_brickinfo_t *dst_brick);
 
 int
-glusterd_brick_create_path (char *host, char *path, uuid_t uuid,
-                            char **op_errstr);
+glusterd_check_and_set_brick_xattr (char *host, char *path, uuid_t uuid,
+                                    char **op_errstr, gf_boolean_t is_force);
+
+int
+glusterd_validate_and_create_brickpath (glusterd_brickinfo_t *brickinfo,
+                                        uuid_t volume_id, char **op_errstr,
+                                        gf_boolean_t is_force);
 int
 glusterd_sm_tr_log_transition_add (glusterd_sm_tr_log_t *log,
                                            int old_state, int new_state,
@@ -346,7 +369,7 @@ gf_boolean_t
 glusterd_peerinfo_is_uuid_unknown (glusterd_peerinfo_t *peerinfo);
 int32_t
 glusterd_brick_connect (glusterd_volinfo_t  *volinfo,
-                        glusterd_brickinfo_t  *brickinfo);
+                        glusterd_brickinfo_t  *brickinfo, char *socketpath);
 int32_t
 glusterd_brick_disconnect (glusterd_brickinfo_t *brickinfo);
 int32_t
@@ -354,13 +377,25 @@ glusterd_delete_volume (glusterd_volinfo_t *volinfo);
 int32_t
 glusterd_delete_brick (glusterd_volinfo_t* volinfo,
                        glusterd_brickinfo_t *brickinfo);
+
 int32_t
 glusterd_delete_all_bricks (glusterd_volinfo_t* volinfo);
+
+int
+glusterd_spawn_daemons (void *opaque);
+
 int
 glusterd_restart_gsyncds (glusterd_conf_t *conf);
+
 int
 glusterd_start_gsync (glusterd_volinfo_t *master_vol, char *slave,
-                      char *glusterd_uuid_str, char **op_errstr);
+                      char *path_list, char *conf_path,
+                      char *glusterd_uuid_str,
+                      char **op_errstr);
+int
+glusterd_get_local_brickpaths (glusterd_volinfo_t *volinfo,
+                               char **pathlist);
+
 int32_t
 glusterd_recreate_bricks (glusterd_conf_t *conf);
 int32_t
@@ -443,6 +478,12 @@ glusterd_defrag_volume_status_update (glusterd_volinfo_t *volinfo,
 int
 glusterd_check_files_identical (char *filename1, char *filename2,
                                 gf_boolean_t *identical);
+
+int
+glusterd_check_topology_identical (const char *filename1,
+                                   const char *filename2,
+                                   gf_boolean_t *identical);
+
 void
 glusterd_volinfo_reset_defrag_stats (glusterd_volinfo_t *volinfo);
 int
@@ -464,6 +505,10 @@ int
 glusterd_volume_heal_use_rsp_dict (dict_t *aggr, dict_t *rsp_dict);
 int
 glusterd_use_rsp_dict (dict_t *aggr, dict_t *rsp_dict);
+int
+glusterd_sys_exec_output_rsp_dict (dict_t *aggr, dict_t *rsp_dict);
+int
+glusterd_snap_use_rsp_dict (dict_t *aggr, dict_t *rsp_dict);
 int32_t
 glusterd_handle_node_rsp (dict_t *req_ctx, void *pending_entry,
                           glusterd_op_t op, dict_t *rsp_dict, dict_t *op_ctx,
@@ -480,11 +525,16 @@ glusterd_profile_volume_brick_rsp (void *pending_entry,
                                    dict_t *rsp_dict, dict_t *op_ctx,
                                    char **op_errstr, gd_node_type type);
 
+gf_boolean_t
+glusterd_are_vol_all_peers_up (glusterd_volinfo_t *volinfo,
+                               struct list_head *peers,
+                               char **down_peerstr);
+
 /* Should be used only when an operation is in progress, as that is the only
  * time a lock_owner is set
  */
 gf_boolean_t
-is_origin_glusterd ();
+is_origin_glusterd (dict_t *dict);
 
 gf_boolean_t
 glusterd_is_quorum_changed (dict_t *options, char *option, char *value);
@@ -515,4 +565,70 @@ glusterd_copy_uuid_to_dict (uuid_t uuid, dict_t *dict, char *key);
 
 gf_boolean_t
 glusterd_is_same_address (char *name1, char *name2);
+
+void
+gd_update_volume_op_versions (glusterd_volinfo_t *volinfo);
+
+char*
+gd_peer_uuid_str (glusterd_peerinfo_t *peerinfo);
+
+gf_boolean_t
+gd_is_remove_brick_committed (glusterd_volinfo_t *volinfo);
+
+gf_boolean_t
+glusterd_are_vol_all_peers_up (glusterd_volinfo_t *volinfo,
+                               struct list_head *peers,
+                               char **down_peerstr);
+
+int
+glusterd_get_slave_details_confpath (glusterd_volinfo_t *volinfo, dict_t *dict,
+                                     char **slave_ip, char **slave_vol,
+                                     char **conf_path, char **op_errstr);
+
+int
+glusterd_check_restart_gsync_session (glusterd_volinfo_t *volinfo, char *slave,
+                                      dict_t *resp_dict, char *path_list,
+                                      char *conf_path, gf_boolean_t is_force);
+
+int
+glusterd_check_gsync_running_local (char *master, char *slave,
+                                    char *conf_path,
+                                    gf_boolean_t *is_run);
+
+gf_boolean_t
+glusterd_is_status_tasks_op (glusterd_op_t op, dict_t *dict);
+
+#ifdef GF_LINUX_HOST_OS
+char*
+glusterd_get_brick_mount_details (glusterd_brickinfo_t *brickinfo);
+struct mntent *
+glusterd_get_mnt_entry_info (char *mnt_pt, FILE *mtab);
+int
+glusterd_get_brick_root (char *path, char **mount_point);
+#endif //LINUX_HOST
+
+int
+glusterd_compare_snap_time(struct list_head *, struct list_head *);
+
+int
+glusterd_compare_snap_vol_time(struct list_head *, struct list_head *);
+
+int32_t
+glusterd_snap_volinfo_restore (dict_t *rsp_dict,
+                               glusterd_volinfo_t *new_volinfo,
+                               glusterd_volinfo_t *snap_volinfo);
+int32_t
+glusterd_lvm_snapshot_remove (dict_t *rsp_dict, glusterd_volinfo_t *snap_vol);
+
+int32_t
+glusterd_missed_snapinfo_new (glusterd_missed_snap_info **missed_snapinfo);
+
+int32_t
+glusterd_missed_snap_op_new (glusterd_snap_op_t **snap_op);
+
+int32_t
+glusterd_add_missed_snaps_to_dict (dict_t *rsp_dict, char *snap_uuid,
+                                   glusterd_brickinfo_t *brickinfo,
+                                   int32_t brick_number, int32_t op);
+
 #endif
diff --git a/xlators/mgmt/glusterd/src/glusterd-volgen.c b/xlators/mgmt/glusterd/src/glusterd-volgen.c
index 53963989a..6f3c69e7d 100644
--- a/xlators/mgmt/glusterd/src/glusterd-volgen.c
+++ b/xlators/mgmt/glusterd/src/glusterd-volgen.c
@@ -15,6 +15,7 @@
 
 #include <fnmatch.h>
 #include <sys/wait.h>
+#include <dlfcn.h>
 
 #if (HAVE_LIB_XML)
 #include <libxml/encoding.h>
@@ -27,6 +28,8 @@
 #include "logging.h"
 #include "dict.h"
 #include "graph-utils.h"
+#include "glusterd-store.h"
+#include "glusterd-hooks.h"
 #include "trie.h"
 #include "glusterd-mem-types.h"
 #include "cli1-xdr.h"
@@ -34,6 +37,7 @@
 #include "glusterd-op-sm.h"
 #include "glusterd-utils.h"
 #include "run.h"
+#include "options.h"
 
 extern struct volopt_map_entry glusterd_volopt_map[];
 
@@ -460,6 +464,8 @@ process_option (char *key, data_t *value, void *param)
         vme.key = key;
         vme.voltype = odt->vme->voltype;
         vme.option = odt->vme->option;
+        vme.op_version = odt->vme->op_version;
+
         if (!vme.option) {
                 vme.option = strrchr (key, '.');
                 if (vme.option)
@@ -590,6 +596,8 @@ get_server_xlator (char *xlator)
                 subvol = GF_XLATOR_MARKER;
         if (strcmp (xlator, "io-stats") == 0)
                 subvol = GF_XLATOR_IO_STATS;
+        if (strcmp (xlator, "bd") == 0)
+                subvol = GF_XLATOR_BD;
 
         return subvol;
 }
@@ -1415,9 +1423,8 @@ server_graph_builder (volgen_graph_t *graph, glusterd_volinfo_t *volinfo,
         char     *password                = NULL;
         char     index_basepath[PATH_MAX] = {0};
         char     key[1024]                = {0};
-        char     *vgname                  = NULL;
-        char     *vg                      = NULL;
         glusterd_brickinfo_t *brickinfo   = NULL;
+        char changelog_basepath[PATH_MAX] = {0,};
 
         brickinfo = param;
         path      = brickinfo->path;
@@ -1436,47 +1443,62 @@ server_graph_builder (volgen_graph_t *graph, glusterd_volinfo_t *volinfo,
                 }
         }
 
-        if (volinfo->backend == GD_VOL_BK_BD) {
-                xl = volgen_graph_add (graph, "storage/bd_map", volname);
-                if (!xl)
-                        return -1;
+        xl = volgen_graph_add (graph, "storage/posix", volname);
+        if (!xl)
+                return -1;
 
-                ret = xlator_set_option (xl, "device", "vg");
-                if (ret)
-                        return -1;
+        ret = xlator_set_option (xl, "directory", path);
+        if (ret)
+                return -1;
 
-                vg = gf_strdup (path);
-                vgname = strrchr (vg, '/');
-                if (strchr(vg, '/') != vgname) {
-                        gf_log ("glusterd", GF_LOG_ERROR,
-                                  "invalid vg specified %s", path);
-                        GF_FREE (vg);
-                        goto out;
-                }
-                vgname++;
-                ret = xlator_set_option (xl, "export", vgname);
-                GF_FREE (vg);
-                if (ret)
-                        return -1;
-        } else {
-                xl = volgen_graph_add (graph, "storage/posix", volname);
+        ret = xlator_set_option (xl, "volume-id",
+                                 uuid_utoa (volinfo->volume_id));
+        if (ret)
+                return -1;
+
+        ret = check_and_add_debug_xl (graph, set_dict, volname,
+                                      "posix");
+        if (ret)
+                return -1;
+#ifdef HAVE_BD_XLATOR
+        if (*brickinfo->vg != '\0') {
+                /* Now add BD v2 xlator if volume is BD type */
+                xl = volgen_graph_add (graph, "storage/bd", volname);
                 if (!xl)
                         return -1;
 
-                ret = xlator_set_option (xl, "directory", path);
+                ret = xlator_set_option (xl, "device", "vg");
                 if (ret)
                         return -1;
-
-                ret = xlator_set_option (xl, "volume-id",
-                                 uuid_utoa (volinfo->volume_id));
+                ret = xlator_set_option (xl, "export", brickinfo->vg);
                 if (ret)
                         return -1;
 
-                ret = check_and_add_debug_xl (graph, set_dict, volname,
-                                                "posix");
+                ret = check_and_add_debug_xl (graph, set_dict, volname, "bd");
                 if (ret)
                         return -1;
+
         }
+#endif
+
+        xl = volgen_graph_add (graph, "features/changelog", volname);
+        if (!xl)
+                return -1;
+
+        ret = xlator_set_option (xl, "changelog-brick", path);
+        if (ret)
+                return -1;
+
+        snprintf (changelog_basepath, sizeof (changelog_basepath),
+                  "%s/%s", path, ".glusterfs/changelogs");
+        ret = xlator_set_option (xl, "changelog-dir", changelog_basepath);
+        if (ret)
+                return -1;
+
+        ret = check_and_add_debug_xl (graph, set_dict, volname, "changelog");
+        if (ret)
+                return -1;
+
         xl = volgen_graph_add (graph, "features/access-control", volname);
         if (!xl)
                 return -1;
@@ -1592,7 +1614,8 @@ server_graph_builder (volgen_graph_t *graph, glusterd_volinfo_t *volinfo,
         }
 
         /* Check for read-only volume option, and add it to the graph */
-        if (dict_get_str_boolean (set_dict, "features.read-only", 0)) {
+        if (dict_get_str_boolean (set_dict, "features.read-only", 0)
+                || volinfo -> is_snap_volume) {
                 xl = volgen_graph_add (graph, "features/read-only", volname);
                 if (!xl) {
                         ret = -1;
@@ -1609,6 +1632,18 @@ server_graph_builder (volgen_graph_t *graph, glusterd_volinfo_t *volinfo,
                 }
         }
 
+        /* Check for compress volume option, and add it to the graph on server side */
+        if (dict_get_str_boolean (set_dict, "features.compress", 0)) {
+                xl = volgen_graph_add (graph, "features/cdc", volname);
+                if (!xl) {
+                        ret = -1;
+                        goto out;
+                }
+                ret = dict_set_str (set_dict, "compress.mode", "server");
+                if (ret)
+                        goto out;
+        }
+
         xl = volgen_graph_add_as (graph, "debug/io-stats", path);
         if (!xl)
                 return -1;
@@ -1672,10 +1707,11 @@ static int
 perfxl_option_handler (volgen_graph_t *graph, struct volopt_map_entry *vme,
                        void *param)
 {
-        char *volname = NULL;
         gf_boolean_t enabled = _gf_false;
+        glusterd_volinfo_t *volinfo = NULL;
 
-        volname = param;
+        GF_ASSERT (param);
+        volinfo = param;
 
         if (strcmp (vme->option, "!perf") != 0)
                 return 0;
@@ -1685,7 +1721,13 @@ perfxl_option_handler (volgen_graph_t *graph, struct volopt_map_entry *vme,
         if (!enabled)
                 return 0;
 
-        if (volgen_graph_add (graph, vme->voltype, volname))
+        /* Check op-version before adding the 'open-behind' xlator in the graph
+         */
+        if (!strcmp (vme->key, "performance.open-behind") &&
+            (vme->op_version > volinfo->client_op_version))
+                return 0;
+
+        if (volgen_graph_add (graph, vme->voltype, volinfo->volname))
                 return 0;
         else
                 return -1;
@@ -1850,7 +1892,7 @@ xml_add_volset_element (xmlTextWriterPtr writer, const char *name,
 #endif
 
 static int
-get_key_from_volopt ( struct volopt_map_entry *vme, char **key)
+_get_xlator_opt_key_from_vme ( struct volopt_map_entry *vme, char **key)
 {
         int ret = 0;
 
@@ -1893,11 +1935,22 @@ get_key_from_volopt ( struct volopt_map_entry *vme, char **key)
         return ret;
 }
 
+static void
+_free_xlator_opt_key (char *key)
+{
+        GF_ASSERT (key);
+
+        if (!strcmp (key, AUTH_ALLOW_OPT_KEY) ||
+            !strcmp (key, AUTH_REJECT_OPT_KEY) ||
+            !strcmp (key, NFS_DISABLE_OPT_KEY))
+                GF_FREE (key);
+
+        return;
+}
+
 int
 glusterd_get_volopt_content (dict_t * ctx, gf_boolean_t xml_out)
 {
-
-        char                    *xlator_type = NULL;
         void                    *dl_handle = NULL;
         volume_opt_list_t        vol_opt_handle = {{0},};
         char                    *key = NULL;
@@ -1923,36 +1976,48 @@ glusterd_get_volopt_content (dict_t * ctx, gf_boolean_t xml_out)
 
         for (vme = &glusterd_volopt_map[0]; vme->key; vme++) {
 
-                if ( ( vme->type == NO_DOC) || (vme->type == GLOBAL_NO_DOC) )
+                if ((vme->type == NO_DOC) || (vme->type == GLOBAL_NO_DOC))
                         continue;
 
-                if (get_key_from_volopt (vme, &key))
-                                goto out; /*Some error while getin key*/
-
                 if (vme->description) {
                         descr = vme->description;
                         def_val = vme->value;
                 } else {
-                        if (!xlator_type || strcmp (vme->voltype, xlator_type)){
-                               ret = xlator_volopt_dynload (vme->voltype,
-                                                            &dl_handle,
-                                                            &vol_opt_handle);
-                                if (ret) {
-                                        dl_handle = NULL;
-                                        continue;
-                                }
+                        if (_get_xlator_opt_key_from_vme (vme, &key)) {
+                                gf_log ("glusterd", GF_LOG_DEBUG, "Failed to "
+                                        "get %s key from volume option entry",
+                                        vme->key);
+                                goto out; /*Some error while geting key*/
                         }
+
+                        ret = xlator_volopt_dynload (vme->voltype,
+                                                     &dl_handle,
+                                                     &vol_opt_handle);
+
+                        if (ret) {
+                                gf_log ("glusterd", GF_LOG_DEBUG,
+                                        "xlator_volopt_dynload error(%d)", ret);
+                                ret = 0;
+                                goto cont;
+                        }
+
                         ret = xlator_option_info_list (&vol_opt_handle, key,
                                                        &def_val, &descr);
-                        if (ret) /*Swallow Error i.e if option not found*/
-                                continue;
+                        if (ret) { /*Swallow Error i.e if option not found*/
+                                gf_log ("glusterd", GF_LOG_DEBUG,
+                                        "Failed to get option for %s key", key);
+                                ret = 0;
+                                goto cont;
+                        }
                 }
 
                 if (xml_out) {
 #if (HAVE_LIB_XML)
                         if (xml_add_volset_element (writer,vme->key,
-                                                    def_val, descr))
-                                goto out;
+                                                    def_val, descr)) {
+                                ret = -1;
+                                goto cont;
+                        }
 #else
                         gf_log ("glusterd", GF_LOG_ERROR, "Libxml not present");
 #endif
@@ -1962,11 +2027,18 @@ glusterd_get_volopt_content (dict_t * ctx, gf_boolean_t xml_out)
                                         vme->key, def_val, descr);
                         strcat (output_string, tmp_str);
                 }
-
-                if (!strcmp (key, AUTH_ALLOW_OPT_KEY) ||
-                    !strcmp (key, AUTH_REJECT_OPT_KEY) ||
-                    !strcmp (key, NFS_DISABLE_OPT_KEY))
-                        GF_FREE (key);
+cont:
+                if (dl_handle) {
+                        dlclose (dl_handle);
+                        dl_handle = NULL;
+                        vol_opt_handle.given_opt = NULL;
+                }
+                if (key) {
+                        _free_xlator_opt_key (key);
+                        key = NULL;
+                }
+                if (ret)
+                        goto out;
         }
 
 #if (HAVE_LIB_XML)
@@ -1993,7 +2065,7 @@ glusterd_get_volopt_content (dict_t * ctx, gf_boolean_t xml_out)
         }
 
         ret = dict_set_dynstr (ctx, "help-str", output);
- out:
+out:
         gf_log ("glusterd", GF_LOG_DEBUG, "Returning %d", ret);
         return ret;
 
@@ -2255,22 +2327,33 @@ volgen_graph_build_dht_cluster (volgen_graph_t *graph,
         int                     ret                      = -1;
         char                    *decommissioned_children = NULL;
         xlator_t                *dht                     = NULL;
-        char                    *optstr                  = NULL;
-        gf_boolean_t             use_nufa                = _gf_false;
+        char                    *voltype                 = "cluster/distribute";
 
-        if (dict_get_str(volinfo->dict,"cluster.nufa",&optstr) == 0) {
-                /* Keep static analyzers quiet by "using" the value. */
-                ret = gf_string2boolean(optstr,&use_nufa);
+        /* NUFA and Switch section */
+        if (dict_get_str_boolean (volinfo->dict, "cluster.nufa", 0) &&
+            dict_get_str_boolean (volinfo->dict, "cluster.switch", 0)) {
+                gf_log (THIS->name, GF_LOG_ERROR,
+                        "nufa and switch cannot be set together");
+                ret = -1;
+                goto out;
         }
 
+        /* Check for NUFA volume option, and change the voltype */
+        if (dict_get_str_boolean (volinfo->dict, "cluster.nufa", 0))
+                voltype = "cluster/nufa";
+
+        /* Check for switch volume option, and change the voltype */
+        if (dict_get_str_boolean (volinfo->dict, "cluster.switch", 0))
+                voltype = "cluster/switch";
+
         clusters = volgen_graph_build_clusters (graph,  volinfo,
-                                                use_nufa
-                                                        ? "cluster/nufa"
-                                                        : "cluster/distribute",
+                                                voltype,
                                                 "%s-dht",
-                                                child_count, child_count);
+                                                child_count,
+                                                child_count);
         if (clusters < 0)
                 goto out;
+
         dht = first_of (graph);
         ret = _graph_get_decommissioned_children (dht, volinfo,
                                                   &decommissioned_children);
@@ -2364,7 +2447,7 @@ build_distribute:
 
         ret = volgen_graph_build_dht_cluster (graph, volinfo,
                                               dist_count);
-        if (ret)
+        if (ret == -1)
                 goto out;
 
         ret = 0;
@@ -2372,6 +2455,29 @@ out:
         return ret;
 }
 
+static int client_graph_set_perf_options(volgen_graph_t *graph,
+					 glusterd_volinfo_t *volinfo,
+					 dict_t *set_dict)
+{
+	data_t *tmp_data = NULL;
+	char *volname = NULL;
+
+	/*
+	 * Logic to make sure NFS doesn't have performance translators by
+	 * default for a volume
+	 */
+	volname = volinfo->volname;
+	tmp_data = dict_get (set_dict, "nfs-volume-file");
+	if (!tmp_data)
+		return volgen_graph_set_options_generic(graph, set_dict,
+							volname,
+							&perfxl_option_handler);
+	else
+		return volgen_graph_set_options_generic(graph, set_dict,
+							volname,
+							&nfsperfxl_option_handler);
+}
+
 static int
 client_graph_builder (volgen_graph_t *graph, glusterd_volinfo_t *volinfo,
                       dict_t *set_dict, void *param)
@@ -2379,7 +2485,6 @@ client_graph_builder (volgen_graph_t *graph, glusterd_volinfo_t *volinfo,
         int       ret      = 0;
         xlator_t *xl       = NULL;
         char     *volname  = NULL;
-        data_t   *tmp_data = NULL;
 
         volname = volinfo->volname;
         ret = volgen_graph_build_clients (graph, volinfo, set_dict, param);
@@ -2387,9 +2492,34 @@ client_graph_builder (volgen_graph_t *graph, glusterd_volinfo_t *volinfo,
                 goto out;
 
         ret = volume_volgen_graph_build_clusters (graph, volinfo);
-        if (ret)
+        if (ret == -1)
                 goto out;
 
+        /* Check for compress volume option, and add it to the graph on client side */
+        if (dict_get_str_boolean (set_dict, "features.compress", 0)) {
+                xl = volgen_graph_add (graph, "features/cdc", volname);
+                if (!xl) {
+                        ret = -1;
+                        goto out;
+                }
+                ret = dict_set_str (set_dict, "compress.mode", "client");
+                if (ret)
+                        goto out;
+
+        }
+
+        ret = glusterd_volinfo_get_boolean (volinfo, "features.encryption");
+        if (ret == -1)
+                goto out;
+        if (ret) {
+                xl = volgen_graph_add (graph, "encryption/crypt", volname);
+
+                if (!xl) {
+                        ret = -1;
+                        goto out;
+                }
+        }
+
         ret = glusterd_volinfo_get_boolean (volinfo, VKEY_FEATURES_QUOTA);
         if (ret == -1)
                 goto out;
@@ -2402,16 +2532,20 @@ client_graph_builder (volgen_graph_t *graph, glusterd_volinfo_t *volinfo,
                 }
         }
 
-        /* Logic to make sure NFS doesn't have performance translators by
-           default for a volume */
-        tmp_data = dict_get (set_dict, "nfs-volume-file");
-        if (!tmp_data)
-                ret = volgen_graph_set_options_generic (graph, set_dict, volname,
-                                                        &perfxl_option_handler);
-        else
-                ret = volgen_graph_set_options_generic (graph, set_dict, volname,
-                                                        &nfsperfxl_option_handler);
 
+        ret = glusterd_volinfo_get_boolean (volinfo, "features.file-snapshot");
+        if (ret == -1)
+                goto out;
+        if (ret) {
+                xl = volgen_graph_add (graph, "features/qemu-block", volname);
+
+                if (!xl) {
+                        ret = -1;
+                        goto out;
+                }
+        }
+
+	ret = client_graph_set_perf_options(graph, volinfo, set_dict);
         if (ret)
                 goto out;
 
@@ -2809,6 +2943,8 @@ build_nfs_graph (volgen_graph_t *graph, dict_t *mod_dict)
         char               *skey          = NULL;
         int                 ret           = 0;
         char               nfs_xprt[16]   = {0,};
+        char               *volname       = NULL;
+        data_t             *data          = NULL;
 
         this = THIS;
         GF_ASSERT (this);
@@ -2834,6 +2970,10 @@ build_nfs_graph (volgen_graph_t *graph, dict_t *mod_dict)
         if (ret)
                 goto out;
 
+        ret = xlator_set_option (nfsxl, "nfs.drc", "on");
+        if (ret)
+                goto out;
+
         list_for_each_entry (voliter, &priv->volumes, vol_list) {
                 if (voliter->status != GLUSTERD_STATUS_STARTED)
                         continue;
@@ -2894,6 +3034,12 @@ build_nfs_graph (volgen_graph_t *graph, dict_t *mod_dict)
                 if (ret)
                         goto out;
 
+                if (mod_dict && (data = dict_get (mod_dict, "volume-name"))) {
+                        volname = data->data;
+                        if (strcmp (volname, voliter->volname) == 0)
+                                dict_copy (mod_dict, set_dict);
+                }
+
                 ret = build_client_graph (&cgraph, voliter, set_dict);
                 if (ret)
                         goto out;
@@ -3029,8 +3175,6 @@ glusterd_generate_brick_volfile (glusterd_volinfo_t *volinfo,
         return ret;
 }
 
-
-
 static void
 get_vol_tstamp_file (char *filename, glusterd_volinfo_t *volinfo)
 {
@@ -3131,7 +3275,7 @@ enumerate_transport_reqs (gf_transport_type type, char **types)
         }
 }
 
-static int
+int
 generate_client_volfiles (glusterd_volinfo_t *volinfo,
                           glusterd_client_type_t client_type)
 {
@@ -3297,6 +3441,54 @@ out:
 }
 
 int
+glusterd_check_nfs_topology_identical (gf_boolean_t *identical)
+{
+        char            nfsvol[PATH_MAX]        = {0,};
+        char            tmpnfsvol[PATH_MAX]     = {0,};
+        glusterd_conf_t *conf                   = NULL;
+        xlator_t        *this                   = THIS;
+        int             ret                     = -1;
+        int             tmpclean                = 0;
+        int             tmpfd                   = -1;
+
+        if ((!identical) || (!this) || (!this->private))
+                goto out;
+
+        conf = (glusterd_conf_t *) this->private;
+
+        /* Fetch the original NFS volfile */
+        glusterd_get_nodesvc_volfile ("nfs", conf->workdir,
+                                      nfsvol, sizeof (nfsvol));
+
+        /* Create the temporary NFS volfile */
+        snprintf (tmpnfsvol, sizeof (tmpnfsvol), "/tmp/gnfs-XXXXXX");
+        tmpfd = mkstemp (tmpnfsvol);
+        if (tmpfd < 0) {
+                gf_log (this->name, GF_LOG_WARNING,
+                                    "Unable to create temp file %s: (%s)",
+                                    tmpnfsvol, strerror (errno));
+                goto out;
+        }
+
+        tmpclean = 1; /* SET the flag to unlink() tmpfile */
+
+        ret = glusterd_create_global_volfile (build_nfs_graph,
+                                              tmpnfsvol, NULL);
+        if (ret)
+                goto out;
+
+        /* Compare the topology of volfiles */
+        ret = glusterd_check_topology_identical (nfsvol, tmpnfsvol,
+                                                 identical);
+out:
+        if (tmpfd >= 0)
+                close (tmpfd);
+        if (tmpclean)
+                unlink (tmpnfsvol);
+        return ret;
+}
+
+int
 glusterd_check_nfs_volfile_identical (gf_boolean_t *identical)
 {
         char            nfsvol[PATH_MAX]        = {0,};
@@ -3405,6 +3597,9 @@ validate_nfsopts (glusterd_volinfo_t *volinfo,
         char    transport_type[16] = {0,};
         char    *tt                = NULL;
         char    err_str[4096]      = {0,};
+        xlator_t *this             = THIS;
+
+        GF_ASSERT (this);
 
         graph.errstr = op_errstr;
 
@@ -3415,7 +3610,7 @@ validate_nfsopts (glusterd_volinfo_t *volinfo,
                         snprintf (err_str, sizeof (err_str), "Changing nfs "
                                   "transport type is allowed only for volumes "
                                   "of transport type tcp,rdma");
-                        gf_log ("", GF_LOG_ERROR, "%s", err_str);
+                        gf_log (this->name, GF_LOG_ERROR, "%s", err_str);
                         *op_errstr = gf_strdup (err_str);
                         ret = -1;
                         goto out;
@@ -3429,6 +3624,12 @@ validate_nfsopts (glusterd_volinfo_t *volinfo,
                 }
         }
 
+        ret = dict_set_str (val_dict, "volume-name", volinfo->volname);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to set volume name");
+                goto out;
+        }
+
         ret = build_nfs_graph (&graph, val_dict);
         if (!ret)
                 ret = graph_reconf_validateopt (&graph.graph, op_errstr);
@@ -3436,60 +3637,12 @@ validate_nfsopts (glusterd_volinfo_t *volinfo,
         volgen_graph_free (&graph);
 
 out:
-        gf_log ("glusterd", GF_LOG_DEBUG, "Returning %d", ret);
+        if (dict_get (val_dict, "volume-name"))
+                dict_del (val_dict, "volume-name");
+        gf_log (this->name, GF_LOG_DEBUG, "Returning %d", ret);
         return ret;
 }
 
-int
-validate_wb_eagerlock (glusterd_volinfo_t *volinfo, dict_t *val_dict,
-                       char **op_errstr)
-{
-        int          ret = -1;
-        gf_boolean_t wb_val = _gf_false;
-        gf_boolean_t el_val = _gf_false;
-        char         msg[2048] = {0};
-        char         *wb_key = NULL;
-        char         *el_key = NULL;
-
-        wb_key = "performance.write-behind";
-        el_key = "cluster.eager-lock";
-        ret = dict_get_str_boolean (val_dict, wb_key, -1);
-        if (ret < 0)
-                goto check_eager_lock;
-        wb_val = ret;
-        ret = glusterd_volinfo_get_boolean (volinfo, el_key);
-        if (ret < 0)
-                goto out;
-        el_val = ret;
-        goto done;
-
-check_eager_lock:
-        ret = dict_get_str_boolean (val_dict, el_key, -1);
-        if (ret < 0) {
-                ret = 0; //Keys of intereset to this fn are not present.
-                goto out;
-        }
-        el_val = ret;
-        ret = glusterd_volinfo_get_boolean (volinfo, wb_key);
-        if (ret < 0)
-                goto out;
-        wb_val = ret;
-        goto done;
-
-done:
-        ret = 0;
-        if (!wb_val && el_val) {
-                ret = -1;
-                snprintf (msg, sizeof (msg), "%s off and %s on is not "
-                          "valid configuration", wb_key, el_key);
-                gf_log ("glusterd", GF_LOG_ERROR, "%s", msg);
-                if (op_errstr)
-                        *op_errstr = gf_strdup (msg);
-                goto out;
-        }
-out:
-        return ret;
-}
 
 int
 validate_clientopts (glusterd_volinfo_t *volinfo,
@@ -3650,10 +3803,6 @@ glusterd_validate_reconfopts (glusterd_volinfo_t *volinfo, dict_t *val_dict,
                 goto out;
         }
 
-        ret = validate_wb_eagerlock (volinfo, val_dict, op_errstr);
-        if (ret)
-                goto out;
-
         ret = validate_clientopts (volinfo, val_dict, op_errstr);
         if (ret) {
                 gf_log ("", GF_LOG_DEBUG,
@@ -3680,19 +3829,237 @@ out:
         return ret;
 }
 
+static struct volopt_map_entry *
+_gd_get_vmep (char *key) {
+        char *completion = NULL;
+        struct volopt_map_entry *vmep = NULL;
+        int ret = 0;
+
+        COMPLETE_OPTION ((char *)key, completion, ret);
+        for (vmep = glusterd_volopt_map; vmep->key; vmep++) {
+                if (strcmp (vmep->key, key) == 0)
+                        return vmep;
+        }
+
+        return NULL;
+}
+
 uint32_t
 glusterd_get_op_version_for_key (char *key)
 {
-        char *completion = NULL;
         struct volopt_map_entry *vmep = NULL;
-        int   ret = 0;
 
-        COMPLETE_OPTION(key, completion, ret);
-        for (vmep = glusterd_volopt_map; vmep->key; vmep++) {
-                if (strcmp (vmep->key, key) == 0) {
-                        return vmep->op_version;
+        GF_ASSERT (key);
+
+        vmep = _gd_get_vmep (key);
+        if (vmep)
+                return vmep->op_version;
+
+        return 0;
+}
+
+gf_boolean_t
+gd_is_client_option (char *key)
+{
+        struct volopt_map_entry *vmep = NULL;
+
+        GF_ASSERT (key);
+
+        vmep = _gd_get_vmep (key);
+        if (vmep && (vmep->flags & OPT_FLAG_CLIENT_OPT))
+                return _gf_true;
+
+        return _gf_false;
+}
+
+gf_boolean_t
+gd_is_xlator_option (char *key)
+{
+        struct volopt_map_entry *vmep = NULL;
+
+        GF_ASSERT (key);
+
+        vmep = _gd_get_vmep (key);
+        if (vmep && (vmep->flags & OPT_FLAG_XLATOR_OPT))
+                return _gf_true;
+
+        return _gf_false;
+}
+
+volume_option_type_t
+_gd_get_option_type (char *key)
+{
+        struct volopt_map_entry *vmep = NULL;
+        void                    *dl_handle = NULL;
+        volume_opt_list_t       vol_opt_list = {{0},};
+        int                     ret = -1;
+        volume_option_t         *opt = NULL;
+        char                    *xlopt_key = NULL;
+        volume_option_type_t    opt_type = GF_OPTION_TYPE_MAX;
+
+        GF_ASSERT (key);
+
+        vmep = _gd_get_vmep (key);
+
+        if (vmep) {
+                INIT_LIST_HEAD (&vol_opt_list.list);
+                ret = xlator_volopt_dynload (vmep->voltype, &dl_handle,
+                                             &vol_opt_list);
+                if (ret)
+                        goto out;
+
+                if (_get_xlator_opt_key_from_vme (vmep, &xlopt_key))
+                        goto out;
+
+                opt = xlator_volume_option_get_list (&vol_opt_list, xlopt_key);
+                _free_xlator_opt_key (xlopt_key);
+
+                if (opt)
+                        opt_type = opt->type;
+        }
+
+out:
+        if (dl_handle) {
+                dlclose (dl_handle);
+                dl_handle = NULL;
+        }
+
+        return opt_type;
+}
+
+gf_boolean_t
+gd_is_boolean_option (char *key)
+{
+        GF_ASSERT (key);
+
+        if (GF_OPTION_TYPE_BOOL == _gd_get_option_type (key))
+                return _gf_true;
+
+        return _gf_false;
+}
+
+/* This function will restore origin volume to it's snap.
+ * The restore operation will simply replace the Gluster origin
+ * volume with the snap volume.
+ * TODO: Multi-volume delete to be done.
+ *       Cleanup in case of restore failure is pending.
+ *
+ * @param orig_vol      volinfo of origin volume
+ * @param snap_vol      volinfo of snapshot volume
+ *
+ * @return 0 on success and negative value on error
+ */
+int
+gd_restore_snap_volume (dict_t *rsp_dict,
+                        glusterd_volinfo_t *orig_vol,
+                        glusterd_volinfo_t *snap_vol)
+{
+        int                     ret             = -1;
+        glusterd_volinfo_t      *new_volinfo    = NULL;
+        glusterd_snap_t         *snap           = NULL;
+        xlator_t                *this           = NULL;
+        glusterd_conf_t         *conf           = NULL;
+        glusterd_volinfo_t      *temp_volinfo   = NULL;
+        glusterd_volinfo_t      *voliter        = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+        GF_ASSERT (rsp_dict);
+        conf = this->private;
+        GF_ASSERT (conf);
+
+        GF_VALIDATE_OR_GOTO (this->name, orig_vol, out);
+        GF_VALIDATE_OR_GOTO (this->name, snap_vol, out);
+        snap = snap_vol->snapshot;
+        GF_VALIDATE_OR_GOTO (this->name, snap, out);
+
+        /* Snap volume must be stoped before performing the
+         * restore operation.
+         */
+        ret = glusterd_stop_volume (snap_vol);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to stop "
+                        "snap volume");
+                goto out;
+        }
+
+        /* Create a new volinfo for the restored volume */
+        ret = glusterd_volinfo_dup (snap_vol, &new_volinfo, _gf_true);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to create volinfo");
+                goto out;
+        }
+
+        /* Following entries need to be derived from origin volume. */
+        strcpy (new_volinfo->volname, orig_vol->volname);
+        uuid_copy (new_volinfo->volume_id, orig_vol->volume_id);
+        new_volinfo->snap_count = orig_vol->snap_count;
+        new_volinfo->snap_max_hard_limit = orig_vol->snap_max_hard_limit;
+        new_volinfo->is_volume_restored = _gf_true;
+
+        /* Bump the version of the restored volume, so that nodes *
+         * which are done can sync during handshake */
+        new_volinfo->version = orig_vol->version;
+
+        list_for_each_entry_safe (voliter, temp_volinfo,
+                         &orig_vol->snap_volumes, snapvol_list) {
+                list_add_tail (&voliter->snapvol_list,
+                               &new_volinfo->snap_volumes);
+        }
+        /* Copy the snap vol info to the new_volinfo.*/
+        ret = glusterd_snap_volinfo_restore (rsp_dict, new_volinfo, snap_vol);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to restore snap");
+                (void)glusterd_volinfo_delete (new_volinfo);
+                goto out;
+        }
+
+        /* If the orig_vol is already restored then we should delete
+         * the backend LVMs */
+        if (orig_vol->is_volume_restored) {
+                ret = glusterd_lvm_snapshot_remove (rsp_dict, orig_vol);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR, "Failed to remove "
+                                "LVM backend");
+                        (void)glusterd_volinfo_delete (new_volinfo);
+                        goto out;
                 }
         }
 
-        return 0;
+        /* Once the new_volinfo is completely constructed then delete
+         * the orinal volinfo
+         */
+        ret = glusterd_volinfo_delete (orig_vol);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to delete volinfo");
+                (void)glusterd_volinfo_delete (new_volinfo);
+                goto out;
+        }
+
+        /* New volinfo always shows the status as created. Therefore
+         * set the status to stop. */
+        glusterd_set_volume_status (new_volinfo, GLUSTERD_STATUS_STOPPED);
+
+        list_add_tail (&new_volinfo->vol_list, &conf->volumes);
+
+        /* Now delete the snap entry. As a first step delete the snap
+         * volume information stored in store. */
+        ret = glusterd_snap_remove (rsp_dict, snap, _gf_false, _gf_true);
+        if (ret) {
+                gf_log (this->name, GF_LOG_WARNING, "Failed to delete "
+                        "snap %s", snap->snapname);
+                goto out;
+        }
+
+        ret = glusterd_store_volinfo (new_volinfo,
+                                      GLUSTERD_VOLINFO_VER_AC_INCREMENT);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to store volinfo");
+                goto out;
+        }
+
+        ret = 0;
+out:
+
+        return ret;
 }
diff --git a/xlators/mgmt/glusterd/src/glusterd-volgen.h b/xlators/mgmt/glusterd/src/glusterd-volgen.h
index 0a9647bdf..fcbaaf93e 100644
--- a/xlators/mgmt/glusterd/src/glusterd-volgen.h
+++ b/xlators/mgmt/glusterd/src/glusterd-volgen.h
@@ -23,6 +23,8 @@
 #define VKEY_DIAG_LAT_MEASUREMENT "diagnostics.latency-measurement"
 #define VKEY_FEATURES_LIMIT_USAGE "features.limit-usage"
 #define VKEY_MARKER_XTIME         GEOREP".indexing"
+#define VKEY_MARKER_XTIME_FORCE   GEOREP".ignore-pid-check"
+#define VKEY_CHANGELOG            "changelog.changelog"
 #define VKEY_FEATURES_QUOTA       "features.quota"
 
 #define AUTH_ALLOW_MAP_KEY "auth.allow"
@@ -60,7 +62,9 @@ typedef enum {
 
 typedef enum gd_volopt_flags_ {
         OPT_FLAG_NONE,
-        OPT_FLAG_FORCE = 1,
+        OPT_FLAG_FORCE = 0x01,      // option needs force to be reset
+        OPT_FLAG_XLATOR_OPT = 0x02, // option enables/disables xlators
+        OPT_FLAG_CLIENT_OPT = 0x04, // option affects clients
 } gd_volopt_flags_t;
 
 typedef enum {
@@ -71,6 +75,7 @@ typedef enum {
         GF_XLATOR_INDEX,
         GF_XLATOR_MARKER,
         GF_XLATOR_IO_STATS,
+        GF_XLATOR_BD,
         GF_XLATOR_NONE,
 } glusterd_server_xlator_t;
 
@@ -99,6 +104,10 @@ struct volopt_map_entry {
         uint32_t op_version;
         char *description;
         vme_option_validation validate_fn;
+        /* If client_option is true, the option affects clients.
+         * this is used to calculate client-op-version of volumes
+         */
+        //gf_boolean_t client_option;
 };
 
 int glusterd_create_rb_volfiles (glusterd_volinfo_t *volinfo,
@@ -115,6 +124,10 @@ int glusterd_create_shd_volfile ();
 
 int glusterd_delete_volfile (glusterd_volinfo_t *volinfo,
                              glusterd_brickinfo_t *brickinfo);
+int
+glusterd_delete_snap_volfile (glusterd_volinfo_t *volinfo,
+                              glusterd_volinfo_t *snap_volinfo,
+                              glusterd_brickinfo_t *brickinfo);
 
 int glusterd_volinfo_get (glusterd_volinfo_t *volinfo, char *key, char **value);
 int glusterd_volinfo_get_boolean (glusterd_volinfo_t *volinfo, char *key);
@@ -128,12 +141,36 @@ glusterd_check_voloption_flags (char *key, int32_t flags);
 gf_boolean_t
 glusterd_is_valid_volfpath (char *volname, char *brick);
 int generate_brick_volfiles (glusterd_volinfo_t *volinfo);
+int generate_snap_brick_volfiles (glusterd_volinfo_t *volinfo,
+                                  glusterd_volinfo_t *snap_volinfo);
+int generate_client_volfiles (glusterd_volinfo_t *volinfo,
+                              glusterd_client_type_t client_type);
+int
+generate_snap_client_volfiles (glusterd_volinfo_t *actual_volinfo,
+                               glusterd_volinfo_t *snap_volinfo,
+                               glusterd_client_type_t client_type,
+                               gf_boolean_t vol_restore);
 int glusterd_get_volopt_content (dict_t *dict, gf_boolean_t xml_out);
 char*
 glusterd_get_trans_type_rb (gf_transport_type ttype);
 int
 glusterd_check_nfs_volfile_identical (gf_boolean_t *identical);
+int
+glusterd_check_nfs_topology_identical (gf_boolean_t *identical);
 
 uint32_t
 glusterd_get_op_version_for_key (char *key);
+
+gf_boolean_t
+gd_is_client_option (char *key);
+
+gf_boolean_t
+gd_is_xlator_option (char *key);
+
+gf_boolean_t
+gd_is_boolean_option (char *key);
+
+int gd_restore_snap_volume (dict_t *rsp_dict,
+                            glusterd_volinfo_t *orig_vol,
+                            glusterd_volinfo_t *snap_vol);
 #endif
diff --git a/xlators/mgmt/glusterd/src/glusterd-volume-ops.c b/xlators/mgmt/glusterd/src/glusterd-volume-ops.c
index bc5f8f2a7..0d322b9ad 100644
--- a/xlators/mgmt/glusterd/src/glusterd-volume-ops.c
+++ b/xlators/mgmt/glusterd/src/glusterd-volume-ops.c
@@ -30,8 +30,9 @@
 #define glusterd_op_start_volume_args_get(dict, volname, flags) \
         glusterd_op_stop_volume_args_get (dict, volname, flags)
 
+
 int
-glusterd_handle_create_volume (rpcsvc_request_t *req)
+__glusterd_handle_create_volume (rpcsvc_request_t *req)
 {
         int32_t                 ret         = -1;
         gf_cli_req              cli_req     = {{0,}};
@@ -134,6 +135,11 @@ glusterd_handle_create_volume (rpcsvc_request_t *req)
                 goto out;
         }
 
+        if (!dict_get (dict, "force")) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to get 'force' flag");
+                goto out;
+        }
+
         uuid_generate (volume_id);
         free_ptr = gf_strdup (uuid_utoa (volume_id));
         ret = dict_set_dynstr (dict, "volume-id", free_ptr);
@@ -187,7 +193,14 @@ out:
 }
 
 int
-glusterd_handle_cli_start_volume (rpcsvc_request_t *req)
+glusterd_handle_create_volume (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req,
+                                            __glusterd_handle_create_volume);
+}
+
+int
+__glusterd_handle_cli_start_volume (rpcsvc_request_t *req)
 {
         int32_t                         ret = -1;
         gf_cli_req                      cli_req = {{0,}};
@@ -252,9 +265,15 @@ out:
         return ret;
 }
 
+int
+glusterd_handle_cli_start_volume (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req,
+                                            __glusterd_handle_cli_start_volume);
+}
 
 int
-glusterd_handle_cli_stop_volume (rpcsvc_request_t *req)
+__glusterd_handle_cli_stop_volume (rpcsvc_request_t *req)
 {
         int32_t                         ret = -1;
         gf_cli_req                      cli_req = {{0,}};
@@ -322,7 +341,14 @@ out:
 }
 
 int
-glusterd_handle_cli_delete_volume (rpcsvc_request_t *req)
+glusterd_handle_cli_stop_volume (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req,
+                                            __glusterd_handle_cli_stop_volume);
+}
+
+int
+__glusterd_handle_cli_delete_volume (rpcsvc_request_t *req)
 {
         int32_t        ret         = -1;
         gf_cli_req     cli_req     = {{0,},};
@@ -392,7 +418,14 @@ out:
 }
 
 int
-glusterd_handle_cli_heal_volume (rpcsvc_request_t *req)
+glusterd_handle_cli_delete_volume (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req,
+                                            __glusterd_handle_cli_delete_volume);
+}
+
+int
+__glusterd_handle_cli_heal_volume (rpcsvc_request_t *req)
 {
         int32_t                         ret = -1;
         gf_cli_req                      cli_req = {{0,}};
@@ -476,7 +509,14 @@ out:
 }
 
 int
-glusterd_handle_cli_statedump_volume (rpcsvc_request_t *req)
+glusterd_handle_cli_heal_volume (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req,
+                                            __glusterd_handle_cli_heal_volume);
+}
+
+int
+__glusterd_handle_cli_statedump_volume (rpcsvc_request_t *req)
 {
         int32_t                         ret = -1;
         gf_cli_req                      cli_req = {{0,}};
@@ -557,32 +597,104 @@ out:
         return ret;
 }
 
+int
+glusterd_handle_cli_statedump_volume (rpcsvc_request_t *req)
+{
+        return glusterd_big_locked_handler (req,
+                                            __glusterd_handle_cli_statedump_volume);
+}
+
 #ifdef HAVE_BD_XLATOR
+/*
+ * Validates if given VG in the brick exists or not. Also checks if VG has
+ * GF_XATTR_VOL_ID_KEY tag set to avoid using same VG for multiple bricks.
+ * Tag is checked only during glusterd_op_stage_create_volume. Tag is set during
+ * glusterd_validate_and_create_brickpath().
+ * @brick - brick info, @check_tag - check for VG tag or not
+ * @msg - Error message to return to caller
+ */
 int
-glusterd_is_valid_vg (const char *name)
+glusterd_is_valid_vg (glusterd_brickinfo_t *brick, int check_tag, char *msg)
 {
-        lvm_t           handle   = NULL;
-        vg_t            vg       = NULL;
-        char            *vg_name = NULL;
-        int             retval   = -1;
+        lvm_t                     handle     = NULL;
+        vg_t                      vg         = NULL;
+        char                     *vg_name    = NULL;
+        int                       retval     = 0;
+        char                     *p          = NULL;
+        char                     *ptr        = NULL;
+        struct dm_list           *dm_lvlist = NULL;
+        struct dm_list           *dm_seglist = NULL;
+        struct lvm_lv_list       *lv_list    = NULL;
+        struct lvm_property_value prop       = {0, };
+        struct lvm_lvseg_list    *seglist    = NULL;
+        struct dm_list           *taglist    = NULL;
+        struct lvm_str_list      *strl       = NULL;
 
         handle = lvm_init (NULL);
         if (!handle) {
-                gf_log ("", GF_LOG_ERROR, "lvm_init failed");
+                sprintf (msg, "lvm_init failed, could not validate vg");
                 return -1;
         }
-        vg_name = gf_strdup (name);
-        vg = lvm_vg_open (handle, basename (vg_name), "r", 0);
+        if (*brick->vg == '\0') { /* BD xlator has vg in brick->path */
+                p = gf_strdup (brick->path);
+                vg_name = strtok_r (p, "/", &ptr);
+        } else
+                vg_name = brick->vg;
+
+        vg = lvm_vg_open (handle, vg_name, "r", 0);
         if (!vg) {
-                gf_log ("", GF_LOG_ERROR, "no such vg: %s", vg_name);
-                goto out;
+                sprintf (msg, "no such vg: %s", vg_name);
+                retval = -1;
+                goto out;
+        }
+        if (!check_tag)
+                goto next;
+
+        taglist = lvm_vg_get_tags (vg);
+        if (!taglist)
+                goto next;
+
+        dm_list_iterate_items (strl, taglist) {
+                if (!strncmp(strl->str, GF_XATTR_VOL_ID_KEY,
+                             strlen (GF_XATTR_VOL_ID_KEY))) {
+                            sprintf (msg, "VG %s is already part of"
+                                    " a brick", vg_name);
+                            retval = -1;
+                            goto out;
+                    }
+        }
+next:
+
+        brick->caps = CAPS_BD | CAPS_OFFLOAD_COPY | CAPS_OFFLOAD_SNAPSHOT;
+
+        dm_lvlist = lvm_vg_list_lvs (vg);
+        if (!dm_lvlist)
+                goto out;
+
+        dm_list_iterate_items (lv_list, dm_lvlist) {
+                dm_seglist = lvm_lv_list_lvsegs (lv_list->lv);
+                dm_list_iterate_items (seglist, dm_seglist) {
+                        prop = lvm_lvseg_get_property (seglist->lvseg,
+                                                       "segtype");
+                        if (!prop.is_valid || !prop.value.string)
+                                continue;
+                        if (!strcmp (prop.value.string, "thin-pool")) {
+                                brick->caps |= CAPS_THIN;
+                                gf_log (THIS->name, GF_LOG_INFO, "Thin Pool "
+                                        "\"%s\" will be used for thin LVs",
+                                        lvm_lv_get_name (lv_list->lv));
+                                break;
+                        }
+                }
         }
+
         retval = 0;
 out:
         if (vg)
                 lvm_vg_close (vg);
         lvm_quit (handle);
-        GF_FREE (vg_name);
+        if (p)
+                GF_FREE (p);
         return retval;
 }
 #endif
@@ -607,9 +719,8 @@ glusterd_op_stage_create_volume (dict_t *dict, char **op_errstr)
         char                                    msg[2048] = {0};
         uuid_t                                  volume_uuid;
         char                                    *volume_uuid_str;
-#ifdef HAVE_BD_XLATOR
-        char                                    *dev_type = NULL;
-#endif
+        gf_boolean_t                             is_force = _gf_false;
+
         this = THIS;
         GF_ASSERT (this);
         priv = this->private;
@@ -652,10 +763,6 @@ glusterd_op_stage_create_volume (dict_t *dict, char **op_errstr)
                 goto out;
         }
 
-#ifdef HAVE_BD_XLATOR
-        ret = dict_get_str (dict, "device", &dev_type);
-#endif
-
         ret = dict_get_str (dict, "bricks", &bricks);
         if (ret) {
                 gf_log (this->name, GF_LOG_ERROR, "Unable to get bricks for "
@@ -663,6 +770,8 @@ glusterd_op_stage_create_volume (dict_t *dict, char **op_errstr)
                 goto out;
         }
 
+        is_force = dict_get_str_boolean (dict, "force", _gf_false);
+
         if (bricks) {
                 brick_list = gf_strdup (bricks);
                 if (!brick_list) {
@@ -702,23 +811,18 @@ glusterd_op_stage_create_volume (dict_t *dict, char **op_errstr)
                         goto out;
                 }
 
+                if (!uuid_compare (brick_info->uuid, MY_UUID)) {
+
 #ifdef HAVE_BD_XLATOR
-                if (dev_type) {
-                        ret = glusterd_is_valid_vg (brick_info->path);
-                        if (ret) {
-                                snprintf (msg, sizeof(msg), "invalid vg %s",
-                                  brick_info->path);
-                                goto out;
+                        if (brick_info->vg[0]) {
+                                ret = glusterd_is_valid_vg (brick_info, 1, msg);
+                                if (ret)
+                                        goto out;
                         }
-
-                        break;
-                } else
 #endif
-                if (!uuid_compare (brick_info->uuid, MY_UUID)) {
-                        ret = glusterd_brick_create_path (brick_info->hostname,
-                                                          brick_info->path,
-                                                          volume_uuid,
-                                                          op_errstr);
+                        ret = glusterd_validate_and_create_brickpath (brick_info,
+                                                          volume_uuid, op_errstr,
+                                                          is_force);
                         if (ret)
                                 goto out;
                         brick_list = tmpptr;
@@ -813,6 +917,7 @@ glusterd_op_stage_start_volume (dict_t *dict, char **op_errstr)
         uuid_t                                  volume_id = {0,};
         char                                    volid[50] = {0,};
         char                                    xattr_volid[50] = {0,};
+        int                                     caps = 0;
 
         this = THIS;
         GF_ASSERT (this);
@@ -862,11 +967,10 @@ glusterd_op_stage_start_volume (dict_t *dict, char **op_errstr)
                 if (uuid_compare (brickinfo->uuid, MY_UUID))
                         continue;
 
-                if (volinfo->backend == GD_VOL_BK_BD)
-                        continue;
-
                 ret = gf_lstat_dir (brickinfo->path, NULL);
-                if (ret) {
+                if (ret && (flags & GF_CLI_FLAG_OP_FORCE)) {
+                        continue;
+                } else if (ret) {
                         snprintf (msg, sizeof (msg), "Failed to find "
                                           "brick directory %s for volume %s. "
                                           "Reason : %s", brickinfo->path,
@@ -875,13 +979,27 @@ glusterd_op_stage_start_volume (dict_t *dict, char **op_errstr)
                 }
                 ret = sys_lgetxattr (brickinfo->path, GF_XATTR_VOL_ID_KEY,
                                      volume_id, 16);
-                if (ret < 0) {
+                if (ret < 0 && (!(flags & GF_CLI_FLAG_OP_FORCE))) {
                         snprintf (msg, sizeof (msg), "Failed to get "
                                   "extended attribute %s for brick dir %s. "
                                   "Reason : %s", GF_XATTR_VOL_ID_KEY,
                                   brickinfo->path, strerror (errno));
                         ret = -1;
                         goto out;
+                } else if (ret < 0) {
+                        ret = sys_lsetxattr (brickinfo->path,
+                                             GF_XATTR_VOL_ID_KEY,
+                                             volinfo->volume_id, 16,
+                                             XATTR_CREATE);
+                        if (ret) {
+                                snprintf (msg, sizeof (msg), "Failed to set "
+                                        "extended attribute %s on %s. Reason: "
+                                        "%s", GF_XATTR_VOL_ID_KEY,
+                                        brickinfo->path, strerror (errno));
+                                goto out;
+                        } else {
+                                continue;
+                        }
                 }
                 if (uuid_compare (volinfo->volume_id, volume_id)) {
                         snprintf (msg, sizeof (msg), "Volume id mismatch for "
@@ -893,8 +1011,24 @@ glusterd_op_stage_start_volume (dict_t *dict, char **op_errstr)
                         ret = -1;
                         goto out;
                 }
+#ifdef HAVE_BD_XLATOR
+                if (brickinfo->vg[0])
+                        caps = CAPS_BD | CAPS_THIN |
+                                CAPS_OFFLOAD_COPY | CAPS_OFFLOAD_SNAPSHOT;
+                /* Check for VG/thin pool if its BD volume */
+                if (brickinfo->vg[0]) {
+                        ret = glusterd_is_valid_vg (brickinfo, 0, msg);
+                        if (ret)
+                                goto out;
+                        /* if anyone of the brick does not have thin support,
+                           disable it for entire volume */
+                        caps &= brickinfo->caps;
+                } else
+                        caps = 0;
+#endif
         }
 
+        volinfo->caps = caps;
         ret = 0;
 out:
         if (ret && (msg[0] != '\0')) {
@@ -1049,6 +1183,16 @@ glusterd_op_stage_delete_volume (dict_t *dict, char **op_errstr)
                 goto out;
         }
 
+        if (volinfo->snap_count > 0 || !list_empty(&volinfo->snap_volumes)) {
+                snprintf (msg, sizeof (msg), "Cannot delete Volume %s ,"
+                        "as it has %ld snapshots. "
+                        "To delete the volume, "
+                        "first delete all the snapshots under it.",
+                          volname, volinfo->snap_count);
+                ret = -1;
+                goto out;
+        }
+
         ret = 0;
 
 out:
@@ -1146,14 +1290,22 @@ glusterd_op_stage_heal_volume (dict_t *dict, char **op_errstr)
                 goto out;
         }
 
-        if ((heal_op != GF_AFR_OP_INDEX_SUMMARY) &&
-            !glusterd_is_nodesvc_online ("glustershd")) {
-                ret = -1;
-                *op_errstr = gf_strdup ("Self-heal daemon is not running."
-                                        " Check self-heal daemon log file.");
-                gf_log (this->name, GF_LOG_WARNING, "%s", "Self-heal daemon is "
-                        "not running. Check self-heal daemon log file.");
-                goto out;
+        switch (heal_op) {
+                case GF_AFR_OP_INDEX_SUMMARY:
+                case GF_AFR_OP_STATISTICS_HEAL_COUNT:
+                case GF_AFR_OP_STATISTICS_HEAL_COUNT_PER_REPLICA:
+                        break;
+                default:
+                        if (!glusterd_is_nodesvc_online("glustershd")){
+                                ret = -1;
+                                *op_errstr = gf_strdup ("Self-heal daemon is "
+                                                "not running. Check self-heal "
+                                                "daemon log file.");
+                                gf_log (this->name, GF_LOG_WARNING, "%s",
+                                        "Self-heal daemon is not running."
+                                        "Check self-heal daemon log file.");
+                                goto out;
+                        }
         }
 
         ret = 0;
@@ -1277,109 +1429,6 @@ out:
         return ret;
 }
 
-#ifdef HAVE_BD_XLATOR
-int
-glusterd_op_stage_bd (dict_t *dict, char **op_errstr)
-{
-        int                     ret       = -1;
-        char                    *volname  = NULL;
-        char                    *path     = NULL;
-        char                    *size     = NULL;
-        glusterd_volinfo_t      *volinfo  = NULL;
-        char                    msg[2048] = {0,};
-        gf_xl_bd_op_t           bd_op     = GF_BD_OP_INVALID;
-        uint64_t                bytes     = 0;
-
-        ret = dict_get_str (dict, "volname", &volname);
-        if (ret) {
-                snprintf (msg, sizeof(msg), "Failed to get volume name");
-                gf_log (THIS->name, GF_LOG_ERROR, "%s", msg);
-                *op_errstr = gf_strdup (msg);
-                goto out;
-        }
-
-        ret = dict_get_int32 (dict, "bd-op", (int32_t *)&bd_op);
-        if (ret) {
-                snprintf (msg, sizeof(msg), "Failed to get bd-op");
-                gf_log (THIS->name, GF_LOG_ERROR, "%s", msg);
-                *op_errstr = gf_strdup (msg);
-                goto out;
-        }
-
-        ret = dict_get_str (dict, "path", &path);
-        if (ret) {
-                snprintf (msg, sizeof(msg), "Failed to get path");
-                gf_log (THIS->name, GF_LOG_ERROR, "%s", msg);
-                *op_errstr = gf_strdup (msg);
-                goto out;
-        }
-
-        if (bd_op == GF_BD_OP_NEW_BD) {
-                ret = dict_get_str (dict, "size", &size);
-                if (ret) {
-                        snprintf (msg, sizeof(msg), "Failed to get size");
-                        gf_log ("", GF_LOG_ERROR, "%s", msg);
-                        *op_errstr = gf_strdup (msg);
-                        goto out;
-                }
-                if (gf_string2bytesize (size, &bytes) < 0) {
-                        snprintf (msg, sizeof(msg),
-                                  "Invalid size %s, suffix with KB, MB etc",
-                                   size);
-                        gf_log ("", GF_LOG_ERROR, "%s", msg);
-                        *op_errstr = gf_strdup (msg);
-                        ret = -1;
-                        goto out;
-                }
-        } else if (bd_op == GF_BD_OP_SNAPSHOT_BD) {
-                ret = dict_get_str (dict, "size", &size);
-                if (ret) {
-                        snprintf (msg, sizeof(msg), "Failed to get size");
-                        gf_log ("", GF_LOG_ERROR, "%s", msg);
-                        *op_errstr = gf_strdup (msg);
-                        goto out;
-                }
-
-                if (gf_string2bytesize (size, &bytes) < 0) {
-                        ret = -1;
-                        snprintf (msg, sizeof(msg),
-                                "Invalid size %s, suffix with KB, MB etc",
-                                size);
-                        gf_log ("", GF_LOG_ERROR, "%s", msg);
-                        *op_errstr = gf_strdup (msg);
-                        goto out;
-                }
-        }
-
-        ret = glusterd_volinfo_find (volname, &volinfo);
-        if (ret) {
-                snprintf (msg, sizeof(msg), "Volume %s does not exist",
-                          volname);
-                gf_log ("", GF_LOG_ERROR, "%s", msg);
-                *op_errstr = gf_strdup (msg);
-                goto out;
-        }
-
-        ret = glusterd_validate_volume_id (dict, volinfo);
-        if (ret)
-                goto out;
-
-        if (!glusterd_is_volume_started (volinfo)) {
-                snprintf (msg, sizeof(msg), "Volume %s is not started",
-                          volname);
-                gf_log ("", GF_LOG_ERROR, "%s", msg);
-                *op_errstr = gf_strdup (msg);
-                ret = -1;
-                goto out;
-        }
-
-        ret = 0;
-out:
-        gf_log ("", GF_LOG_DEBUG, "Returning %d", ret);
-        return ret;
-}
-#endif
-
 int
 glusterd_op_create_volume (dict_t *dict, char **op_errstr)
 {
@@ -1401,9 +1450,8 @@ glusterd_op_create_volume (dict_t *dict, char **op_errstr)
         char                 *str        = NULL;
         char                 *username   = NULL;
         char                 *password   = NULL;
-#ifdef HAVE_BD_XLATOR
-        char                 *device     = NULL;
-#endif
+        int                   caps       = 0;
+        char                  msg[1024] __attribute__((unused)) = {0, };
 
         this = THIS;
         GF_ASSERT (this);
@@ -1458,12 +1506,6 @@ glusterd_op_create_volume (dict_t *dict, char **op_errstr)
                 goto out;
         }
 
-#ifdef HAVE_BD_XLATOR
-        ret = dict_get_str (dict, "device", &device);
-        if (!ret)
-                volinfo->backend = GD_VOL_BK_BD;
-#endif
-
         /* replica-count 1 means, no replication, file is in one brick only */
         volinfo->replica_count = 1;
         /* stripe-count 1 means, no striping, file is present as a whole */
@@ -1572,6 +1614,7 @@ glusterd_op_create_volume (dict_t *dict, char **op_errstr)
 
         if (count)
                 brick = strtok_r (brick_list+1, " \n", &saveptr);
+        caps = CAPS_BD | CAPS_THIN | CAPS_OFFLOAD_COPY | CAPS_OFFLOAD_SNAPSHOT;
 
         while ( i <= count) {
                 ret = glusterd_brickinfo_new_from_brick (brick, &brickinfo);
@@ -1584,11 +1627,36 @@ glusterd_op_create_volume (dict_t *dict, char **op_errstr)
                                 brickinfo->hostname, brickinfo->path);
                         goto out;
                 }
+
+#ifdef HAVE_BD_XLATOR
+                if (!uuid_compare (brickinfo->uuid, MY_UUID)) {
+                        if (brickinfo->vg[0]) {
+                                ret = glusterd_is_valid_vg (brickinfo, 0, msg);
+                                if (ret) {
+                                        gf_log (this->name, GF_LOG_ERROR, "%s",
+                                                msg);
+                                        goto out;
+                                }
+
+                                /* if anyone of the brick does not have thin
+                                   support, disable it for entire volume */
+                                caps &= brickinfo->caps;
+
+
+                        } else
+                                caps = 0;
+                }
+#endif
+
                 list_add_tail (&brickinfo->brick_list, &volinfo->bricks);
                 brick = strtok_r (NULL, " \n", &saveptr);
                 i++;
         }
 
+        gd_update_volume_op_versions (volinfo);
+
+        volinfo->caps = caps;
+
         ret = glusterd_store_volinfo (volinfo, GLUSTERD_VOLINFO_VER_AC_INCREMENT);
         if (ret) {
                 glusterd_store_delete_volume (volinfo);
@@ -1605,6 +1673,7 @@ glusterd_op_create_volume (dict_t *dict, char **op_errstr)
         volinfo->rebal.defrag_status = 0;
         list_add_tail (&volinfo->vol_list, &priv->volumes);
         vol_added = _gf_true;
+
 out:
         GF_FREE(free_ptr);
         if (!vol_added && volinfo)
@@ -1638,7 +1707,10 @@ glusterd_op_start_volume (dict_t *dict, char **op_errstr)
 
         list_for_each_entry (brickinfo, &volinfo->bricks, brick_list) {
                 ret = glusterd_brick_start (volinfo, brickinfo, _gf_true);
-                if (ret)
+                /* If 'force' try to start all bricks regardless of success or
+                 * failure
+                 */
+                if (!(flags & GF_CLI_FLAG_OP_FORCE) && ret)
                         goto out;
         }
 
@@ -1655,6 +1727,47 @@ out:
         return ret;
 }
 
+int
+glusterd_stop_volume (glusterd_volinfo_t *volinfo)
+{
+        int                     ret             = -1;
+        glusterd_brickinfo_t    *brickinfo      = NULL;
+        xlator_t                *this           = NULL;
+
+        this = THIS;
+        GF_ASSERT (this);
+
+        GF_VALIDATE_OR_GOTO (this->name, volinfo, out);
+
+        list_for_each_entry (brickinfo, &volinfo->bricks, brick_list) {
+                ret = glusterd_brick_stop (volinfo, brickinfo, _gf_false);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_ERROR, "Failed to stop "
+                                "brick (%s)", brickinfo->path);
+                        goto out;
+                }
+        }
+
+        glusterd_set_volume_status (volinfo, GLUSTERD_STATUS_STOPPED);
+
+        ret = glusterd_store_volinfo (volinfo, GLUSTERD_VOLINFO_VER_AC_INCREMENT);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to store volinfo of "
+                        "%s volume", volinfo->volname);
+                goto out;
+        }
+
+        ret = glusterd_nodesvcs_handle_graph_change (volinfo);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to notify graph "
+                        "change for %s volume", volinfo->volname);
+                goto out;
+        }
+
+out:
+        return ret;
+}
+
 
 int
 glusterd_op_stop_volume (dict_t *dict)
@@ -1663,7 +1776,6 @@ glusterd_op_stop_volume (dict_t *dict)
         int                                     flags = 0;
         char                                    *volname = NULL;
         glusterd_volinfo_t                      *volinfo = NULL;
-        glusterd_brickinfo_t                    *brickinfo = NULL;
         xlator_t                                *this = NULL;
 
         this = THIS;
@@ -1680,19 +1792,12 @@ glusterd_op_stop_volume (dict_t *dict)
                 goto out;
         }
 
-        list_for_each_entry (brickinfo, &volinfo->bricks, brick_list) {
-                ret = glusterd_brick_stop (volinfo, brickinfo, _gf_false);
-                if (ret)
-                        goto out;
-        }
-
-        glusterd_set_volume_status (volinfo, GLUSTERD_STATUS_STOPPED);
-
-        ret = glusterd_store_volinfo (volinfo, GLUSTERD_VOLINFO_VER_AC_INCREMENT);
-        if (ret)
+        ret = glusterd_stop_volume (volinfo);
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to stop %s volume",
+                        volname);
                 goto out;
-
-        ret = glusterd_nodesvcs_handle_graph_change (volinfo);
+        }
 out:
         return ret;
 }
@@ -1844,7 +1949,9 @@ glusterd_clearlocks_unmount (glusterd_volinfo_t *volinfo, char *mntpt)
         runner_add_args (&runner, "/bin/umount", "-f", NULL);
         runner_argprintf (&runner, "%s", mntpt);
 
+        synclock_unlock (&priv->big_lock);
         ret = runner_run (&runner);
+        synclock_lock (&priv->big_lock);
         if (ret) {
                 ret = 0;
                 gf_log ("", GF_LOG_DEBUG,
@@ -1916,7 +2023,9 @@ glusterd_clearlocks_mount (glusterd_volinfo_t *volinfo, char **xl_opts,
         }
 
         runner_argprintf (&runner, "%s", mntpt);
+        synclock_unlock (&priv->big_lock);
         ret = runner_run (&runner);
+        synclock_lock (&priv->big_lock);
         if (ret) {
                 gf_log (THIS->name, GF_LOG_DEBUG,
                         "Could not start glusterfs");
diff --git a/xlators/mgmt/glusterd/src/glusterd-volume-set.c b/xlators/mgmt/glusterd/src/glusterd-volume-set.c
index bc8d53e85..665a8b298 100644
--- a/xlators/mgmt/glusterd/src/glusterd-volume-set.c
+++ b/xlators/mgmt/glusterd/src/glusterd-volume-set.c
@@ -347,145 +347,212 @@ out:
 
 struct volopt_map_entry glusterd_volopt_map[] = {
         /* DHT xlator options */
-        { .key         = "cluster.lookup-unhashed",
-          .voltype     = "cluster/distribute",
-          .op_version  = 1
-        },
-        { .key         = "cluster.min-free-disk",
-          .voltype     = "cluster/distribute",
-          .op_version  = 1
-        },
-        { .key         = "cluster.min-free-inodes",
-          .voltype     = "cluster/distribute",
-          .op_version  = 1
-        },
-        { .key         = "cluster.rebalance-stats",
-          .voltype     = "cluster/distribute",
-          .op_version  = 2
+        { .key        = "cluster.lookup-unhashed",
+          .voltype    = "cluster/distribute",
+          .op_version = 1,
+          .flags      = OPT_FLAG_CLIENT_OPT
+        },
+        { .key        = "cluster.min-free-disk",
+          .voltype    = "cluster/distribute",
+          .op_version = 1,
+          .flags      = OPT_FLAG_CLIENT_OPT
+        },
+        { .key        = "cluster.min-free-inodes",
+          .voltype    = "cluster/distribute",
+          .op_version = 1,
+          .flags      = OPT_FLAG_CLIENT_OPT
+        },
+        { .key        = "cluster.rebalance-stats",
+          .voltype    = "cluster/distribute",
+          .op_version = 2,
+          .flags      = OPT_FLAG_CLIENT_OPT
         },
         { .key         = "cluster.subvols-per-directory",
           .voltype     = "cluster/distribute",
           .option      = "directory-layout-spread",
           .op_version  = 2,
-          .validate_fn = validate_subvols_per_directory
-        },
-        { .key         = "cluster.readdir-optimize",
-          .voltype     = "cluster/distribute",
-          .op_version  = 2
-        },
-        { .key         = "cluster.nufa",
-          .voltype     = "cluster/distribute",
-          .option      = "!nufa",
-          .type        = NO_DOC,
-          .op_version  = 2
-        },
-        { .key         = "cluster.rsync-hash-regex",
-          .voltype     = "cluster/distribute",
-          .type        = NO_DOC,
-          .op_version  = 2
-        },
-        { .key         = "cluster.extra-hash-regex",
-          .voltype     = "cluster/distribute",
-          .type        = NO_DOC,
-          .op_version  = 2
+          .validate_fn = validate_subvols_per_directory,
+          .flags       = OPT_FLAG_CLIENT_OPT
+        },
+        { .key        = "cluster.readdir-optimize",
+          .voltype    = "cluster/distribute",
+          .op_version = 1,
+          .flags      = OPT_FLAG_CLIENT_OPT
+        },
+        { .key        = "cluster.rsync-hash-regex",
+          .voltype    = "cluster/distribute",
+          .type       = NO_DOC,
+          .op_version = 3,
+          .flags      = OPT_FLAG_CLIENT_OPT
+        },
+        { .key        = "cluster.extra-hash-regex",
+          .voltype    = "cluster/distribute",
+          .type       = NO_DOC,
+          .op_version = 3,
+          .flags      = OPT_FLAG_CLIENT_OPT
+        },
+        { .key        = "cluster.dht-xattr-name",
+          .voltype    = "cluster/distribute",
+          .option     = "xattr-name",
+          .type       = NO_DOC,
+          .op_version = 3,
+          .flags      = OPT_FLAG_CLIENT_OPT
+        },
+
+        /* NUFA xlator options (Distribute special case) */
+        { .key        = "cluster.nufa",
+          .voltype    = "cluster/distribute",
+          .option     = "!nufa",
+          .type       = NO_DOC,
+          .op_version = 2,
+          .flags      = OPT_FLAG_CLIENT_OPT
+        },
+        { .key        = "cluster.local-volume-name",
+          .voltype    = "cluster/nufa",
+          .option     = "local-volume-name",
+          .type       = NO_DOC,
+          .op_version = 3,
+          .flags      = OPT_FLAG_CLIENT_OPT
+        },
+
+        /* Switch xlator options (Distribute special case) */
+        { .key        = "cluster.switch",
+          .voltype    = "cluster/distribute",
+          .option     = "!switch",
+          .type       = NO_DOC,
+          .op_version = 3,
+          .flags      = OPT_FLAG_CLIENT_OPT
+        },
+        { .key        = "cluster.switch-pattern",
+          .voltype    = "cluster/switch",
+          .option     = "pattern.switch.case",
+          .type       = NO_DOC,
+          .op_version = 3,
+          .flags      = OPT_FLAG_CLIENT_OPT
         },
 
         /* AFR xlator options */
-        { .key         = "cluster.entry-change-log",
-          .voltype     = "cluster/replicate",
-          .op_version  = 1
-        },
-        { .key         = "cluster.read-subvolume",
-          .voltype     = "cluster/replicate",
-          .op_version  = 1
-        },
-        { .key         = "cluster.read-subvolume-index",
-          .voltype     = "cluster/replicate",
-          .op_version  = 2
-        },
-        { .key         = "cluster.read-hash-mode",
-          .voltype     = "cluster/replicate",
-          .op_version  = 2
-        },
-        { .key         = "cluster.background-self-heal-count",
-          .voltype     = "cluster/replicate",
-          .op_version  = 1
-        },
-        { .key         = "cluster.metadata-self-heal",
-          .voltype     = "cluster/replicate",
-          .op_version  = 1
-        },
-        { .key         = "cluster.data-self-heal",
-          .voltype     = "cluster/replicate",
-          .op_version  = 1
-        },
-        { .key         = "cluster.entry-self-heal",
-          .voltype     = "cluster/replicate",
-          .op_version  = 1
-        },
-        { .key         = "cluster.self-heal-daemon",
-          .voltype     = "cluster/replicate",
-          .option      = "!self-heal-daemon",
-          .op_version  = 1
-        },
-        { .key         = "cluster.heal-timeout",
-          .voltype     = "cluster/replicate",
-          .option      = "!heal-timeout",
-          .op_version  = 2
-        },
-        { .key         = "cluster.strict-readdir",
-          .voltype     = "cluster/replicate",
-          .type        = NO_DOC,
-          .op_version  = 1
-        },
-        { .key         = "cluster.self-heal-window-size",
-          .voltype     = "cluster/replicate",
-          .option      = "data-self-heal-window-size",
-          .op_version  = 1
-        },
-        { .key         = "cluster.data-change-log",
-          .voltype     = "cluster/replicate",
-          .op_version  = 1
-        },
-        { .key         = "cluster.metadata-change-log",
-          .voltype     = "cluster/replicate",
-          .op_version  = 1
-        },
-        { .key         = "cluster.data-self-heal-algorithm",
-          .voltype     = "cluster/replicate",
-          .option      = "data-self-heal-algorithm",
-          .op_version  = 1
-        },
-        { .key         = "cluster.eager-lock",
-          .voltype     = "cluster/replicate",
-          .op_version  = 1
-        },
-        { .key         = "cluster.quorum-type",
-          .voltype     = "cluster/replicate",
-          .option      = "quorum-type",
-          .op_version  = 1
-        },
-        { .key         = "cluster.quorum-count",
-          .voltype     = "cluster/replicate",
-          .option      = "quorum-count",
-          .op_version  = 1
-        },
-        { .key         = "cluster.choose-local",
-          .voltype     = "cluster/replicate",
-          .op_version  = 2
-        },
-        { .key         = "cluster.self-heal-readdir-size",
-          .voltype     = "cluster/replicate",
-          .op_version  = 2
-        },
-        { .key         = "cluster.post-op-delay-secs",
-          .voltype     = "cluster/replicate",
-          .type        = NO_DOC,
-          .op_version  = 2
-        },
-        { .key         = "cluster.readdir-failover",
-          .voltype     = "cluster/replicate",
-          .op_version  = 2
+        { .key        = "cluster.entry-change-log",
+          .voltype    = "cluster/replicate",
+          .op_version = 1,
+          .flags      = OPT_FLAG_CLIENT_OPT
+        },
+        { .key        = "cluster.read-subvolume",
+          .voltype    = "cluster/replicate",
+          .op_version = 1,
+          .flags     = OPT_FLAG_CLIENT_OPT
+        },
+        { .key        = "cluster.read-subvolume-index",
+          .voltype    = "cluster/replicate",
+          .op_version = 2,
+          .flags      = OPT_FLAG_CLIENT_OPT
+        },
+        { .key        = "cluster.read-hash-mode",
+          .voltype    = "cluster/replicate",
+          .op_version = 2,
+          .flags      = OPT_FLAG_CLIENT_OPT
+        },
+        { .key        = "cluster.background-self-heal-count",
+          .voltype    = "cluster/replicate",
+          .op_version = 1,
+          .flags      = OPT_FLAG_CLIENT_OPT
+        },
+        { .key        = "cluster.metadata-self-heal",
+          .voltype    = "cluster/replicate",
+          .op_version = 1,
+          .flags      = OPT_FLAG_CLIENT_OPT
+        },
+        { .key        = "cluster.data-self-heal",
+          .voltype    = "cluster/replicate",
+          .op_version = 1,
+          .flags      = OPT_FLAG_CLIENT_OPT
+        },
+        { .key        = "cluster.entry-self-heal",
+          .voltype    = "cluster/replicate",
+          .op_version = 1,
+          .flags      = OPT_FLAG_CLIENT_OPT
+        },
+        { .key           = "cluster.self-heal-daemon",
+          .voltype       = "cluster/replicate",
+          .option        = "!self-heal-daemon",
+          .op_version    = 1
+        },
+        { .key        = "cluster.heal-timeout",
+          .voltype    = "cluster/replicate",
+          .option     = "!heal-timeout",
+          .op_version = 2,
+          .flags      = OPT_FLAG_CLIENT_OPT
+        },
+        { .key        = "cluster.strict-readdir",
+          .voltype    = "cluster/replicate",
+          .type       = NO_DOC,
+          .op_version = 1,
+          .flags      = OPT_FLAG_CLIENT_OPT
+        },
+        { .key        = "cluster.self-heal-window-size",
+          .voltype    = "cluster/replicate",
+          .option     = "data-self-heal-window-size",
+          .op_version = 1,
+          .flags      = OPT_FLAG_CLIENT_OPT
+        },
+        { .key        = "cluster.data-change-log",
+          .voltype    = "cluster/replicate",
+          .op_version = 1,
+          .flags      = OPT_FLAG_CLIENT_OPT
+        },
+        { .key        = "cluster.metadata-change-log",
+          .voltype    = "cluster/replicate",
+          .op_version = 1,
+          .flags      = OPT_FLAG_CLIENT_OPT
+        },
+        { .key        = "cluster.data-self-heal-algorithm",
+          .voltype    = "cluster/replicate",
+          .option     = "data-self-heal-algorithm",
+          .op_version = 1,
+          .flags      = OPT_FLAG_CLIENT_OPT
+        },
+        { .key        = "cluster.eager-lock",
+          .voltype    = "cluster/replicate",
+          .op_version = 1,
+          .flags      = OPT_FLAG_CLIENT_OPT
+        },
+        { .key        = "cluster.quorum-type",
+          .voltype    = "cluster/replicate",
+          .option     = "quorum-type",
+          .op_version = 1,
+          .flags      = OPT_FLAG_CLIENT_OPT
+        },
+        { .key        = "cluster.quorum-count",
+          .voltype    = "cluster/replicate",
+          .option     = "quorum-count",
+          .op_version = 1,
+          .flags      = OPT_FLAG_CLIENT_OPT
+        },
+        { .key        = "cluster.choose-local",
+          .voltype    = "cluster/replicate",
+          .op_version = 2,
+          .flags      = OPT_FLAG_CLIENT_OPT
+        },
+        { .key        = "cluster.self-heal-readdir-size",
+          .voltype    = "cluster/replicate",
+          .op_version = 2,
+          .flags      = OPT_FLAG_CLIENT_OPT
+        },
+        { .key        = "cluster.post-op-delay-secs",
+          .voltype    = "cluster/replicate",
+          .type       = NO_DOC,
+          .op_version = 2,
+          .flags      = OPT_FLAG_CLIENT_OPT
+        },
+        { .key        = "cluster.readdir-failover",
+          .voltype    = "cluster/replicate",
+          .op_version = 2,
+          .flags      = OPT_FLAG_CLIENT_OPT
+        },
+        { .key        = "cluster.ensure-durability",
+          .voltype    = "cluster/replicate",
+          .op_version = 3,
+          .flags      = OPT_FLAG_CLIENT_OPT
         },
 
         /* Stripe xlator options */
@@ -493,12 +560,14 @@ struct volopt_map_entry glusterd_volopt_map[] = {
           .voltype     = "cluster/stripe",
           .option      = "block-size",
           .op_version  = 1,
-          .validate_fn = validate_stripe
+          .validate_fn = validate_stripe,
+          .flags       = OPT_FLAG_CLIENT_OPT
         },
-        { .key         = "cluster.stripe-coalesce",
-          .voltype     = "cluster/stripe",
-          .option      = "coalesce",
-          .op_version  = 2
+        { .key        = "cluster.stripe-coalesce",
+          .voltype    = "cluster/stripe",
+          .option     = "coalesce",
+          .op_version = 1,
+          .flags      = OPT_FLAG_CLIENT_OPT
         },
 
         /* IO-stats xlator options */
@@ -524,20 +593,22 @@ struct volopt_map_entry glusterd_volopt_map[] = {
           .option      = "!brick-log-level",
           .op_version  = 1
         },
-        { .key         = "diagnostics.client-log-level",
-          .voltype     = "debug/io-stats",
-          .option      = "!client-log-level",
-          .op_version  = 1
+        { .key        = "diagnostics.client-log-level",
+          .voltype    = "debug/io-stats",
+          .option     = "!client-log-level",
+          .op_version = 1,
+          .flags      = OPT_FLAG_CLIENT_OPT
         },
         { .key         = "diagnostics.brick-sys-log-level",
           .voltype     = "debug/io-stats",
           .option      = "!sys-log-level",
           .op_version  = 1
         },
-        { .key         = "diagnostics.client-sys-log-level",
-          .voltype     = "debug/io-stats",
-          .option      = "!sys-log-level",
-          .op_version  = 1
+        { .key        = "diagnostics.client-sys-log-level",
+          .voltype    = "debug/io-stats",
+          .option     = "!sys-log-level",
+          .op_version = 1,
+          .flags      = OPT_FLAG_CLIENT_OPT
         },
 
         /* IO-cache xlator options */
@@ -545,27 +616,32 @@ struct volopt_map_entry glusterd_volopt_map[] = {
           .voltype     = "performance/io-cache",
           .option      = "max-file-size",
           .op_version  = 1,
-          .validate_fn = validate_cache_max_min_size
+          .validate_fn = validate_cache_max_min_size,
+          .flags       = OPT_FLAG_CLIENT_OPT
         },
         { .key         = "performance.cache-min-file-size",
           .voltype     = "performance/io-cache",
           .option      = "min-file-size",
           .op_version  = 1,
-          .validate_fn = validate_cache_max_min_size
+          .validate_fn = validate_cache_max_min_size,
+          .flags       = OPT_FLAG_CLIENT_OPT
         },
-        { .key         = "performance.cache-refresh-timeout",
-          .voltype     = "performance/io-cache",
-          .option      = "cache-timeout",
-          .op_version  = 1
+        { .key        = "performance.cache-refresh-timeout",
+          .voltype    = "performance/io-cache",
+          .option     = "cache-timeout",
+          .op_version = 1,
+          .flags      = OPT_FLAG_CLIENT_OPT
         },
-        { .key         = "performance.cache-priority",
-          .voltype     = "performance/io-cache",
-          .option      = "priority",
-          .op_version  = 1
+        { .key        = "performance.cache-priority",
+          .voltype    = "performance/io-cache",
+          .option     = "priority",
+          .op_version = 1,
+          .flags      = OPT_FLAG_CLIENT_OPT
         },
-        { .key         = "performance.cache-size",
-          .voltype     = "performance/io-cache",
-          .op_version  = 1
+        { .key        = "performance.cache-size",
+          .voltype    = "performance/io-cache",
+          .op_version = 1,
+          .flags      = OPT_FLAG_CLIENT_OPT
         },
 
         /* IO-threads xlator options */
@@ -592,87 +668,130 @@ struct volopt_map_entry glusterd_volopt_map[] = {
         },
         { .key         = "performance.enable-least-priority",
           .voltype     = "performance/io-threads",
-          .op_version  = 2
+          .op_version  = 1
         },
         { .key         = "performance.least-rate-limit",
           .voltype     = "performance/io-threads",
-          .op_version  = 1
+          .op_version  = 2
         },
 
         /* Other perf xlators' options */
-        { .key         = "performance.cache-size",
-          .voltype     = "performance/quick-read",
-          .op_version  = 1
-        },
-        { .key         = "performance.flush-behind",
-          .voltype     = "performance/write-behind",
-          .option      = "flush-behind",
-          .op_version  = 1
-        },
-        { .key         = "performance.write-behind-window-size",
-          .voltype     = "performance/write-behind",
-          .option      = "cache-size",
-          .op_version  = 1
-        },
-        { .key         = "performance.strict-o-direct",
-          .voltype     = "performance/write-behind",
-          .option      = "strict-O_DIRECT",
-          .op_version  = 2
-        },
-        { .key         = "performance.strict-write-ordering",
-          .voltype     = "performance/write-behind",
-          .option      = "strict-write-ordering",
-          .op_version  = 2
-        },
-        { .key         = "performance.lazy-open",
-          .voltype     = "performance/open-behind",
-          .option      = "lazy-open",
-          .op_version =  2
-        },
-        { .key         = "performance.read-ahead-page-count",
-          .voltype     = "performance/read-ahead",
-          .option      = "page-count",
-          .op_version  = 1
-        },
-        { .key         = "performance.md-cache-timeout",
-          .voltype     = "performance/md-cache",
-          .option      = "md-cache-timeout",
-          .op_version  = 2
+        { .key        = "performance.cache-size",
+          .voltype    = "performance/quick-read",
+          .op_version = 1,
+          .flags      = OPT_FLAG_CLIENT_OPT
+        },
+        { .key        = "performance.flush-behind",
+          .voltype    = "performance/write-behind",
+          .option     = "flush-behind",
+          .op_version = 1,
+          .flags      = OPT_FLAG_CLIENT_OPT
+        },
+        { .key        = "performance.write-behind-window-size",
+          .voltype    = "performance/write-behind",
+          .option     = "cache-size",
+          .op_version = 1,
+          .flags      = OPT_FLAG_CLIENT_OPT
+        },
+        { .key        = "performance.strict-o-direct",
+          .voltype    = "performance/write-behind",
+          .option     = "strict-O_DIRECT",
+          .op_version = 2,
+          .flags      = OPT_FLAG_CLIENT_OPT
+        },
+        { .key        = "performance.strict-write-ordering",
+          .voltype    = "performance/write-behind",
+          .option     = "strict-write-ordering",
+          .op_version = 2,
+          .flags      = OPT_FLAG_CLIENT_OPT
+        },
+        { .key        = "performance.lazy-open",
+          .voltype    = "performance/open-behind",
+          .option     = "lazy-open",
+          .op_version = 3,
+          .flags      = OPT_FLAG_CLIENT_OPT
+        },
+        { .key        = "performance.read-ahead-page-count",
+          .voltype    = "performance/read-ahead",
+          .option     = "page-count",
+          .op_version = 1,
+          .flags      = OPT_FLAG_CLIENT_OPT
+        },
+        { .key        = "performance.md-cache-timeout",
+          .voltype    = "performance/md-cache",
+          .option     = "md-cache-timeout",
+          .op_version = 2,
+          .flags      = OPT_FLAG_CLIENT_OPT
+        },
+
+ 	/* Crypt xlator options */
+
+	{ .key         = "features.encryption",
+	  .voltype     = "encryption/crypt",
+	  .option      = "!feat",
+	  .value       = "off",
+	  .op_version  = 3,
+	  .description = "enable/disable client-side encryption for "
+                         "the volume.",
+	  .flags       = OPT_FLAG_CLIENT_OPT | OPT_FLAG_XLATOR_OPT
+	},
+
+        { .key         = "encryption.master-key",
+          .voltype     = "encryption/crypt",
+          .op_version  = 3,
+          .flags      = OPT_FLAG_CLIENT_OPT
+        },
+        { .key         = "encryption.data-key-size",
+          .voltype     = "encryption/crypt",
+          .op_version  = 3,
+          .flags      = OPT_FLAG_CLIENT_OPT
+        },
+        { .key         = "encryption.block-size",
+          .voltype     = "encryption/crypt",
+          .op_version  = 3,
+          .flags      = OPT_FLAG_CLIENT_OPT
         },
 
         /* Client xlator options */
-        { .key         = "network.frame-timeout",
-          .voltype     = "protocol/client",
-          .op_version  = 1
-        },
-        { .key         = "network.ping-timeout",
-          .voltype     = "protocol/client",
-          .op_version  = 1
-        },
-        { .key         = "network.tcp-window-size",
-          .voltype     = "protocol/client",
-          .op_version  = 1
-        },
-        { .key         = "features.lock-heal",
-          .voltype     = "protocol/client",
-          .option      = "lk-heal",
-          .op_version  = 1
-        },
-        { .key         = "features.grace-timeout",
-          .voltype     = "protocol/client",
-          .option      = "grace-timeout",
-          .op_version  = 1
-        },
-        { .key         = "client.ssl",
-          .voltype     = "protocol/client",
-          .option      = "transport.socket.ssl-enabled",
-          .type        = NO_DOC,
-          .op_version  = 2
-        },
-        { .key         = "network.remote-dio",
-          .voltype     = "protocol/client",
-          .option      = "filter-O_DIRECT",
-          .op_version  = 1
+        { .key        = "network.frame-timeout",
+          .voltype    = "protocol/client",
+          .op_version = 1,
+          .flags      = OPT_FLAG_CLIENT_OPT
+        },
+        { .key        = "network.ping-timeout",
+          .voltype    = "protocol/client",
+          .op_version = 1,
+          .flags      = OPT_FLAG_CLIENT_OPT
+        },
+        { .key        = "network.tcp-window-size",
+          .voltype    = "protocol/client",
+          .op_version = 1,
+          .flags      = OPT_FLAG_CLIENT_OPT
+        },
+        { .key        = "features.lock-heal",
+          .voltype    = "protocol/client",
+          .option     = "lk-heal",
+          .op_version = 1,
+          .flags      = OPT_FLAG_CLIENT_OPT
+        },
+        { .key        = "features.grace-timeout",
+          .voltype    = "protocol/client",
+          .option     = "grace-timeout",
+          .op_version = 1,
+          .flags      = OPT_FLAG_CLIENT_OPT
+        },
+        { .key        = "client.ssl",
+          .voltype    = "protocol/client",
+          .option     = "transport.socket.ssl-enabled",
+          .type       = NO_DOC,
+          .op_version = 2,
+          .flags      = OPT_FLAG_CLIENT_OPT
+        },
+        { .key        = "network.remote-dio",
+          .voltype    = "protocol/client",
+          .option     = "filter-O_DIRECT",
+          .op_version = 2,
+          .flags      = OPT_FLAG_CLIENT_OPT
         },
 
         /* Server xlator options */
@@ -717,6 +836,12 @@ struct volopt_map_entry glusterd_volopt_map[] = {
           .option      = "statedump-path",
           .op_version  = 1
         },
+        { .key         = "server.outstanding-rpc-limit",
+          .voltype     = "protocol/server",
+          .option      = "rpc.outstanding-rpc-limit",
+          .type        = GLOBAL_DOC,
+          .op_version  = 3
+        },
         { .key         = "features.lock-heal",
           .voltype     = "protocol/server",
           .option      = "lk-heal",
@@ -742,35 +867,52 @@ struct volopt_map_entry glusterd_volopt_map[] = {
           .option      = "!perf",
           .value       = "on",
           .op_version  = 1,
-          .description = "enable/disable write-behind translator in the volume."
+          .description = "enable/disable write-behind translator in the "
+                         "volume.",
+          .flags       = OPT_FLAG_CLIENT_OPT | OPT_FLAG_XLATOR_OPT
         },
         { .key         = "performance.read-ahead",
           .voltype     = "performance/read-ahead",
           .option      = "!perf",
           .value       = "on",
           .op_version  = 1,
-          .description = "enable/disable read-ahead translator in the volume."
+          .description = "enable/disable read-ahead translator in the volume.",
+          .flags       = OPT_FLAG_CLIENT_OPT | OPT_FLAG_XLATOR_OPT
         },
+        { .key         = "performance.readdir-ahead",
+          .voltype     = "performance/readdir-ahead",
+          .option      = "!perf",
+          .value       = "off",
+          .op_version  = 3,
+          .description = "enable/disable readdir-ahead translator in the volume.",
+          .flags       = OPT_FLAG_CLIENT_OPT | OPT_FLAG_XLATOR_OPT
+        },
+
         { .key         = "performance.io-cache",
           .voltype     = "performance/io-cache",
           .option      = "!perf",
           .value       = "on",
           .op_version  = 1,
-          .description = "enable/disable io-cache translator in the volume."
+          .description = "enable/disable io-cache translator in the volume.",
+          .flags       = OPT_FLAG_CLIENT_OPT
         },
         { .key         = "performance.quick-read",
           .voltype     = "performance/quick-read",
           .option      = "!perf",
           .value       = "on",
           .op_version  = 1,
-          .description = "enable/disable quick-read translator in the volume."
+          .description = "enable/disable quick-read translator in the volume.",
+          .flags       = OPT_FLAG_CLIENT_OPT | OPT_FLAG_XLATOR_OPT
+
         },
         { .key         = "performance.open-behind",
           .voltype     = "performance/open-behind",
           .option      = "!perf",
           .value       = "on",
           .op_version  = 2,
-          .description = "enable/disable open-behind translator in the volume."
+          .description = "enable/disable open-behind translator in the volume.",
+          .flags       = OPT_FLAG_CLIENT_OPT | OPT_FLAG_XLATOR_OPT
+
         },
         { .key         = "performance.stat-prefetch",
           .voltype     = "performance/md-cache",
@@ -778,7 +920,8 @@ struct volopt_map_entry glusterd_volopt_map[] = {
           .value       = "on",
           .op_version  = 1,
           .description = "enable/disable meta-data caching translator in the "
-                         "volume."
+                         "volume.",
+          .flags       = OPT_FLAG_CLIENT_OPT | OPT_FLAG_XLATOR_OPT
         },
         { .key         = "performance.client-io-threads",
           .voltype     = "performance/io-threads",
@@ -786,77 +929,143 @@ struct volopt_map_entry glusterd_volopt_map[] = {
           .value       = "off",
           .op_version  = 1,
           .description = "enable/disable io-threads translator in the client "
-                         "graph of volume."
-        },
-        { .key         = "performance.nfs.write-behind",
-          .voltype     = "performance/write-behind",
-          .option      = "!nfsperf",
+                         "graph of volume.",
+          .flags       = OPT_FLAG_CLIENT_OPT | OPT_FLAG_XLATOR_OPT
+        },
+        { .key        = "performance.nfs.write-behind",
+          .voltype    = "performance/write-behind",
+          .option     = "!nfsperf",
+          .value      = "on",
+          .type       = NO_DOC,
+          .op_version = 1,
+          .flags      = OPT_FLAG_XLATOR_OPT
+        },
+        { .key        = "performance.nfs.read-ahead",
+          .voltype    = "performance/read-ahead",
+          .option     = "!nfsperf",
+          .value      = "off",
+          .type       = NO_DOC,
+          .op_version = 1,
+          .flags      = OPT_FLAG_XLATOR_OPT
+        },
+        { .key        = "performance.nfs.io-cache",
+          .voltype    = "performance/io-cache",
+          .option     = "!nfsperf",
+          .value      = "off",
+          .type       = NO_DOC,
+          .op_version = 1,
+          .flags      = OPT_FLAG_XLATOR_OPT
+        },
+        { .key        = "performance.nfs.quick-read",
+          .voltype    = "performance/quick-read",
+          .option     = "!nfsperf",
+          .value      = "off",
+          .type       = NO_DOC,
+          .op_version = 1,
+          .flags      = OPT_FLAG_XLATOR_OPT
+        },
+        { .key        = "performance.nfs.stat-prefetch",
+          .voltype    = "performance/md-cache",
+          .option     = "!nfsperf",
+          .value      = "off",
+          .type       = NO_DOC,
+          .op_version = 1,
+          .flags      = OPT_FLAG_XLATOR_OPT
+        },
+        { .key        = "performance.nfs.io-threads",
+          .voltype    = "performance/io-threads",
+          .option     = "!nfsperf",
+          .value      = "off",
+          .type       = NO_DOC,
+          .op_version = 1,
+          .flags      = OPT_FLAG_XLATOR_OPT
+        },
+        { .key        = "performance.force-readdirp",
+          .voltype    = "performance/md-cache",
+          .option     = "force-readdirp",
+          .op_version = 2,
+          .flags      = OPT_FLAG_CLIENT_OPT
+        },
+
+	/* Feature translators */
+        { .key         = "features.file-snapshot",
+          .voltype     = "features/qemu-block",
+          .option      = "!feat",
+          .value       = "off",
+          .op_version  = 3,
+          .description = "enable/disable file-snapshot feature in the "
+                         "volume.",
+          .flags       = OPT_FLAG_CLIENT_OPT | OPT_FLAG_XLATOR_OPT
+        },
+
+#ifdef HAVE_LIB_Z
+        /* Compressor-decompressor xlator options
+         * defaults used from xlator/feature/compress/src/cdc.h
+         */
+        { .key         = "features.compress",
+          .voltype     = "features/cdc",
+          .option      = "!compress",
           .value       = "off",
           .type        = NO_DOC,
-          .op_version  = 1
+          .op_version  = 2,
+          .description = "enable/disable compression translator"
         },
-        { .key         = "performance.nfs.read-ahead",
-          .voltype     = "performance/read-ahead",
-          .option      = "!nfsperf",
-          .value       = "off",
+        { .key         = "compress.mode",
+          .voltype     = "features/cdc",
           .type        = NO_DOC,
-          .op_version  = 1
+          .op_version  = 2
         },
-        { .key         = "performance.nfs.io-cache",
-          .voltype     = "performance/io-cache",
-          .option      = "!nfsperf",
-          .value       = "off",
+        { .key         = "compress.window-size",
+          .voltype     = "features/cdc",
           .type        = NO_DOC,
-          .op_version  = 1
+          .op_version  = 2
         },
-        { .key         = "performance.nfs.quick-read",
-          .voltype     = "performance/quick-read",
-          .option      = "!nfsperf",
-          .value       = "off",
+        { .key         = "compress.mem-level",
+          .voltype     = "features/cdc",
           .type        = NO_DOC,
-          .op_version  = 1
+          .op_version  = 2
         },
-        { .key         = "performance.nfs.stat-prefetch",
-          .voltype     = "performance/md-cache",
-          .option      = "!nfsperf",
-          .value       = "off",
+        { .key         = "compress.min-size",
+          .voltype     = "features/cdc",
           .type        = NO_DOC,
-          .op_version  = 1
+          .op_version  = 2
         },
-        { .key         = "performance.nfs.io-threads",
-          .voltype     = "performance/io-threads",
-          .option      = "!nfsperf",
-          .value       = "off",
+        { .key         = "compress.compression-level",
+          .voltype     = "features/cdc",
           .type        = NO_DOC,
-          .op_version  = 1
+          .op_version  = 2
         },
-        { .key         = "performance.force-readdirp",
-          .voltype     = "performance/md-cache",
-          .option      = "force-readdirp",
+        { .key         = "compress.debug",
+          .voltype     = "features/cdc",
+          .type        = NO_DOC,
           .op_version  = 2
         },
+ #endif
 
         /* Quota xlator options */
-        { .key         = VKEY_FEATURES_LIMIT_USAGE,
-          .voltype     = "features/quota",
-          .option      = "limit-set",
-          .type        = NO_DOC,
-          .op_version  = 1
+        { .key        = VKEY_FEATURES_LIMIT_USAGE,
+          .voltype    = "features/quota",
+          .option     = "limit-set",
+          .type       = NO_DOC,
+          .op_version = 1,
+          .flags      = OPT_FLAG_CLIENT_OPT
         },
         { .key         = "features.quota-timeout",
           .voltype     = "features/quota",
           .option      = "timeout",
           .value       = "0",
           .op_version  = 1,
-          .validate_fn = validate_quota
+          .validate_fn = validate_quota,
+          .flags       = OPT_FLAG_CLIENT_OPT
         },
         { .key         = "features.quota-deem-statfs",
           .voltype     = "features/quota",
           .option      = "deem-statfs",
           .value       = "off",
           .type        = DOC,
-          .op_version  = 2,
-          .validate_fn = validate_quota
+          .op_version  = 3,
+          .validate_fn = validate_quota,
+          .flags       = OPT_FLAG_CLIENT_OPT
         },
 
         /* Marker xlator options */
@@ -876,6 +1085,22 @@ struct volopt_map_entry glusterd_volopt_map[] = {
           .flags       = OPT_FLAG_FORCE,
           .op_version  = 1
         },
+        { .key         = VKEY_MARKER_XTIME_FORCE,
+          .voltype     = "features/marker",
+          .option      = "gsync-force-xtime",
+          .value       = "off",
+          .type        = NO_DOC,
+          .flags       = OPT_FLAG_FORCE,
+          .op_version  = 2
+        },
+        { .key         = VKEY_MARKER_XTIME_FORCE,
+          .voltype     = "features/marker",
+          .option      = "!gsync-force-xtime",
+          .value       = "off",
+          .type        = NO_DOC,
+          .flags       = OPT_FLAG_FORCE,
+          .op_version  = 2
+        },
         { .key         = VKEY_FEATURES_QUOTA,
           .voltype     = "features/marker",
           .option      = "quota",
@@ -886,12 +1111,13 @@ struct volopt_map_entry glusterd_volopt_map[] = {
         },
 
         /* Debug xlators options */
-        { .key         = "debug.trace",
-          .voltype     = "debug/trace",
-          .option      = "!debug",
-          .value       = "off",
-          .type        = NO_DOC,
-          .op_version  = 1
+        { .key        = "debug.trace",
+          .voltype    = "debug/trace",
+          .option     = "!debug",
+          .value      = "off",
+          .type       = NO_DOC,
+          .op_version = 1,
+          .flags      = OPT_FLAG_XLATOR_OPT
         },
         { .key         = "debug.log-history",
           .voltype     = "debug/trace",
@@ -917,36 +1143,37 @@ struct volopt_map_entry glusterd_volopt_map[] = {
           .type        = NO_DOC,
           .op_version  = 2
         },
-        { .key         = "debug.error-gen",
-          .voltype     = "debug/error-gen",
-          .option      = "!debug",
-          .value       = "off",
-          .type        = NO_DOC,
-          .op_version  = 1
+        { .key        = "debug.error-gen",
+          .voltype    = "debug/error-gen",
+          .option     = "!debug",
+          .value      = "off",
+          .type       = NO_DOC,
+          .op_version = 1,
+          .flags      = OPT_FLAG_XLATOR_OPT
         },
         { .key         = "debug.error-failure",
           .voltype     = "debug/error-gen",
           .option      = "failure",
           .type        = NO_DOC,
-          .op_version  = 2
+          .op_version  = 3
         },
         { .key         = "debug.error-number",
           .voltype     = "debug/error-gen",
           .option      = "error-no",
           .type        = NO_DOC,
-          .op_version  = 2
+          .op_version  = 3
         },
         { .key         = "debug.random-failure",
           .voltype     = "debug/error-gen",
           .option      = "random-failure",
           .type        = NO_DOC,
-          .op_version  = 2
+          .op_version  = 3
         },
         { .key         = "debug.error-fops",
           .voltype     = "debug/error-gen",
           .option      = "enable",
           .type        = NO_DOC,
-          .op_version  = 2
+          .op_version  = 3
         },
 
 
@@ -993,6 +1220,12 @@ struct volopt_map_entry glusterd_volopt_map[] = {
           .type        = GLOBAL_DOC,
           .op_version  = 1
         },
+        { .key         = "nfs.outstanding-rpc-limit",
+          .voltype     = "nfs/server",
+          .option      = "rpc.outstanding-rpc-limit",
+          .type        = GLOBAL_DOC,
+          .op_version  = 3
+        },
         { .key         = "nfs.port",
           .voltype     = "nfs/server",
           .option      = "nfs.port",
@@ -1063,50 +1296,115 @@ struct volopt_map_entry glusterd_volopt_map[] = {
           .type        = GLOBAL_DOC,
           .op_version  = 1
         },
+        { .key         = "nfs.acl",
+          .voltype     = "nfs/server",
+          .option      = "nfs.acl",
+          .type        = GLOBAL_DOC,
+          .op_version  = 3
+        },
         { .key         = "nfs.mount-udp",
           .voltype     = "nfs/server",
           .option      = "nfs.mount-udp",
           .type        = GLOBAL_DOC,
           .op_version  = 1
         },
+        { .key         = "nfs.mount-rmtab",
+          .voltype     = "nfs/server",
+          .option      = "nfs.mount-rmtab",
+          .type        = GLOBAL_DOC,
+          .op_version  = 1
+        },
         { .key         = "nfs.server-aux-gids",
           .voltype     = "nfs/server",
           .option      = "nfs.server-aux-gids",
           .type        = NO_DOC,
           .op_version  = 2
         },
+        { .key         = "nfs.drc",
+          .voltype     = "nfs/server",
+          .option      = "nfs.drc",
+          .type        = GLOBAL_DOC,
+          .op_version  = 3
+        },
+        { .key         = "nfs.drc-size",
+          .voltype     = "nfs/server",
+          .option      = "nfs.drc-size",
+          .type        = GLOBAL_DOC,
+          .op_version  = 3
+        },
+        { .key         = "nfs.read-size",
+          .voltype     = "nfs/server",
+          .option      = "nfs3.read-size",
+          .type        = GLOBAL_DOC,
+          .op_version  = 3
+        },
+        { .key         = "nfs.write-size",
+          .voltype     = "nfs/server",
+          .option      = "nfs3.write-size",
+          .type        = GLOBAL_DOC,
+          .op_version  = 3
+        },
+        { .key         = "nfs.readdir-size",
+          .voltype     = "nfs/server",
+          .option      = "nfs3.readdir-size",
+          .type        = GLOBAL_DOC,
+          .op_version  = 3
+        },
 
         /* Other options which don't fit any place above */
-        { .key         = "features.read-only",
-          .voltype     = "features/read-only",
-          .option      = "!read-only",
-          .value       = "off",
-          .op_version  = 2
-        },
-        { .key         = "features.worm",
-          .voltype     = "features/worm",
-          .option      = "!worm",
-          .value       = "off",
-          .op_version  = 2
+        { .key        = "features.read-only",
+          .voltype    = "features/read-only",
+          .option     = "!read-only",
+          .value      = "off",
+          .op_version = 1,
+          .flags      = OPT_FLAG_CLIENT_OPT | OPT_FLAG_XLATOR_OPT
+        },
+        { .key        = "features.worm",
+          .voltype    = "features/worm",
+          .option     = "!worm",
+          .value      = "off",
+          .op_version = 2,
+          .flags      = OPT_FLAG_CLIENT_OPT | OPT_FLAG_XLATOR_OPT
         },
         { .key         = "storage.linux-aio",
           .voltype     = "storage/posix",
-          .op_version  = 2
+          .op_version  = 1
+        },
+        { .key         = "storage.batch-fsync-mode",
+          .voltype     = "storage/posix",
+          .op_version  = 3
+        },
+        { .key         = "storage.batch-fsync-delay-usec",
+          .voltype     = "storage/posix",
+          .op_version  = 3
         },
         { .key         = "storage.owner-uid",
           .voltype     = "storage/posix",
           .option      = "brick-uid",
-          .op_version  = 2
+          .op_version  = 1
         },
         { .key         = "storage.owner-gid",
           .voltype     = "storage/posix",
           .option      = "brick-gid",
-          .op_version  = 2
+          .op_version  = 1
         },
-        { .key         = "config.memory-accounting",
-          .voltype     = "configuration",
-          .option      = "!config",
-          .op_version  = 2
+        { .key         = "storage.node-uuid-pathinfo",
+          .voltype     = "storage/posix",
+          .op_version  = 3
+        },
+        { .key         = "storage.health-check-interval",
+          .voltype     = "storage/posix",
+          .op_version  = 3
+        },
+        { .key         = "storage.bd-aio",
+          .voltype     = "storage/bd",
+          .op_version  = 3
+        },
+        { .key        = "config.memory-accounting",
+          .voltype    = "configuration",
+          .option     = "!config",
+          .op_version = 2,
+          .flags      = OPT_FLAG_CLIENT_OPT
         },
         { .key         = "config.transport",
           .voltype     = "configuration",
@@ -1123,6 +1421,32 @@ struct volopt_map_entry glusterd_volopt_map[] = {
           .value       = "0",
           .op_version  = 2
         },
+        /* changelog translator - global tunables */
+        { .key         = "changelog.changelog",
+          .voltype     = "features/changelog",
+          .type        = NO_DOC,
+          .op_version  = 2
+        },
+        { .key         = "changelog.changelog-dir",
+          .voltype     = "features/changelog",
+          .type        = NO_DOC,
+          .op_version  = 2
+        },
+        { .key         = "changelog.encoding",
+          .voltype     = "features/changelog",
+          .type        = NO_DOC,
+          .op_version  = 2
+        },
+        { .key         = "changelog.rollover-time",
+          .voltype     = "features/changelog",
+          .type        = NO_DOC,
+          .op_version  = 2
+        },
+        { .key         = "changelog.fsync-interval",
+          .voltype     = "features/changelog",
+          .type        = NO_DOC,
+          .op_version  = 2
+        },
         { .key         = NULL
         }
 };
diff --git a/xlators/mgmt/glusterd/src/glusterd.c b/xlators/mgmt/glusterd/src/glusterd.c
index c2d8d70e3..59288ada0 100644
--- a/xlators/mgmt/glusterd/src/glusterd.c
+++ b/xlators/mgmt/glusterd/src/glusterd.c
@@ -1,5 +1,5 @@
 /*
-   Copyright (c) 2006-2012 Red Hat, Inc. <http://www.redhat.com>
+   Copyright (c) 2006-2013 Red Hat, Inc. <http://www.redhat.com>
    This file is part of GlusterFS.
 
    This file is licensed to you under your choice of the GNU Lesser
@@ -36,6 +36,7 @@
 #include "glusterd-store.h"
 #include "glusterd-hooks.h"
 #include "glusterd-utils.h"
+#include "glusterd-locks.h"
 #include "common-utils.h"
 #include "run.h"
 
@@ -44,29 +45,43 @@
 #include "glusterd-mountbroker.h"
 
 extern struct rpcsvc_program gluster_handshake_prog;
+extern struct rpcsvc_program gluster_cli_getspec_prog;
 extern struct rpcsvc_program gluster_pmap_prog;
 extern glusterd_op_info_t opinfo;
 extern struct rpcsvc_program gd_svc_mgmt_prog;
+extern struct rpcsvc_program gd_svc_mgmt_v3_prog;
 extern struct rpcsvc_program gd_svc_peer_prog;
 extern struct rpcsvc_program gd_svc_cli_prog;
+extern struct rpcsvc_program gd_svc_cli_prog_ro;
 extern struct rpc_clnt_program gd_brick_prog;
 extern struct rpcsvc_program glusterd_mgmt_hndsk_prog;
 
+extern char snap_mount_folder[PATH_MAX];
+
 rpcsvc_cbk_program_t glusterd_cbk_prog = {
         .progname  = "Gluster Callback",
         .prognum   = GLUSTER_CBK_PROGRAM,
         .progver   = GLUSTER_CBK_VERSION,
 };
 
-struct rpcsvc_program *all_programs[] = {
+struct rpcsvc_program *gd_inet_programs[] = {
         &gd_svc_peer_prog,
-        &gd_svc_cli_prog,
+        &gd_svc_cli_prog_ro,
         &gd_svc_mgmt_prog,
+        &gd_svc_mgmt_v3_prog,
         &gluster_pmap_prog,
         &gluster_handshake_prog,
         &glusterd_mgmt_hndsk_prog,
 };
-int rpcsvc_programs_count = (sizeof (all_programs) / sizeof (all_programs[0]));
+int gd_inet_programs_count = (sizeof (gd_inet_programs) /
+                              sizeof (gd_inet_programs[0]));
+
+struct rpcsvc_program *gd_uds_programs[] = {
+        &gd_svc_cli_prog,
+        &gluster_cli_getspec_prog,
+};
+int gd_uds_programs_count = (sizeof (gd_uds_programs) /
+                             sizeof (gd_uds_programs[0]));
 
 const char *gd_op_list[GD_OP_MAX + 1] = {
         [GD_OP_NONE]                    = "Invalid op",
@@ -94,6 +109,10 @@ const char *gd_op_list[GD_OP_MAX + 1] = {
         [GD_OP_LIST_VOLUME]             = "Lists",
         [GD_OP_CLEARLOCKS_VOLUME]       = "Clear locks",
         [GD_OP_DEFRAG_BRICK_VOLUME]     = "Rebalance",
+        [GD_OP_COPY_FILE]               = "Copy File",
+        [GD_OP_SYS_EXEC]                = "Execute system commands",
+        [GD_OP_GSYNC_CREATE]            = "Geo-replication Create",
+        [GD_OP_SNAP]                    = "Snapshot",
         [GD_OP_MAX]                     = "Invalid op"
 };
 
@@ -119,12 +138,12 @@ glusterd_uuid_init ()
         GF_ASSERT (this);
         priv = this->private;
 
-	ret = glusterd_retrieve_uuid ();
-	if (ret == 0) {
-		gf_log (this->name, GF_LOG_INFO,
-			"retrieved UUID: %s", uuid_utoa (priv->uuid));
-		return 0;
-	}
+        ret = glusterd_retrieve_uuid ();
+        if (ret == 0) {
+                gf_log (this->name, GF_LOG_INFO,
+                        "retrieved UUID: %s", uuid_utoa (priv->uuid));
+                return 0;
+        }
 
         ret = glusterd_uuid_generate_save ();
 
@@ -427,8 +446,8 @@ glusterd_crt_georep_folders (char *georepdir, glusterd_conf_t *conf)
         if (strlen (conf->workdir)+2 > PATH_MAX-strlen(GEOREP)) {
                 ret = -1;
                 gf_log ("glusterd", GF_LOG_CRITICAL,
-                        "Unable to create "GEOREP" directory %s",
-                        georepdir);
+                        "directory path %s/"GEOREP" is longer than PATH_MAX",
+                        conf->workdir);
                 goto out;
         }
 
@@ -444,8 +463,8 @@ glusterd_crt_georep_folders (char *georepdir, glusterd_conf_t *conf)
         if (strlen (DEFAULT_LOG_FILE_DIRECTORY"/"GEOREP) >= PATH_MAX) {
                 ret = -1;
                 gf_log ("glusterd", GF_LOG_CRITICAL,
-                        "Unable to create "GEOREP" directory %s",
-                        georepdir);
+                        "directory path "DEFAULT_LOG_FILE_DIRECTORY"/"
+                        GEOREP" is longer than PATH_MAX");
                 goto out;
         }
         ret = mkdir_p (DEFAULT_LOG_FILE_DIRECTORY"/"GEOREP, 0777, _gf_true);
@@ -459,8 +478,8 @@ glusterd_crt_georep_folders (char *georepdir, glusterd_conf_t *conf)
         if (strlen(DEFAULT_LOG_FILE_DIRECTORY"/"GEOREP"-slaves") >= PATH_MAX) {
                 ret = -1;
                 gf_log ("glusterd", GF_LOG_CRITICAL,
-                        "Unable to create "GEOREP" directory %s",
-                        georepdir);
+                        "directory path "DEFAULT_LOG_FILE_DIRECTORY"/"
+                        GEOREP"-slaves"" is longer than PATH_MAX");
                 goto out;
         }
         ret = mkdir_p (DEFAULT_LOG_FILE_DIRECTORY"/"GEOREP"-slaves", 0777,
@@ -475,8 +494,8 @@ glusterd_crt_georep_folders (char *georepdir, glusterd_conf_t *conf)
         if (strlen(DEFAULT_LOG_FILE_DIRECTORY"/"GEOREP"-slaves/mbr") >= PATH_MAX) {
                 ret = -1;
                 gf_log ("glusterd", GF_LOG_CRITICAL,
-                        "Unable to create "GEOREP" moubtbroker directory %s",
-                        georepdir);
+                        "directory path "DEFAULT_LOG_FILE_DIRECTORY"/"GEOREP
+                        "-slaves/mbr"" is longer than PATH_MAX");
                 goto out;
         }
         ret = mkdir_p (DEFAULT_LOG_FILE_DIRECTORY"/"GEOREP"-slaves/mbr", 0777,
@@ -519,7 +538,7 @@ runinit_gsyncd_setrx (runner_t *runner, glusterd_conf_t *conf)
 {
         runinit (runner);
         runner_add_args (runner, GSYNCD_PREFIX"/gsyncd", "-c", NULL);
-        runner_argprintf (runner, "%s/"GSYNC_CONF,conf->workdir);
+        runner_argprintf (runner, "%s/"GSYNC_CONF_TEMPLATE, conf->workdir);
         runner_add_arg (runner, "--config-set-rx");
 }
 
@@ -568,7 +587,8 @@ configure_syncdaemon (glusterd_conf_t *conf)
         RUN_GSYNCD_CMD;
 
         runinit_gsyncd_setrx (&runner, conf);
-        runner_add_args (&runner, "remote-gsyncd", GSYNCD_PREFIX"/gsyncd", ".", "^ssh:", NULL);
+        runner_add_args (&runner, "remote-gsyncd", "/nonexistent/gsyncd",
+                         ".", "^ssh:", NULL);
         RUN_GSYNCD_CMD;
 
         /* gluster-command-dir */
@@ -580,7 +600,7 @@ configure_syncdaemon (glusterd_conf_t *conf)
         /* gluster-params */
         runinit_gsyncd_setrx (&runner, conf);
         runner_add_args (&runner, "gluster-params",
-                         "xlator-option=*-dht.assert-no-child-down=true",
+                         "aux-gfid-mount xlator-option=*-dht.assert-no-child-down=true",
                          ".", ".", NULL);
         RUN_GSYNCD_CMD;
 
@@ -597,14 +617,30 @@ configure_syncdaemon (glusterd_conf_t *conf)
         /* pid-file */
         runinit_gsyncd_setrx (&runner, conf);
         runner_add_arg (&runner, "pid-file");
-        runner_argprintf (&runner, "%s/${mastervol}/${eSlave}.pid", georepdir);
+        runner_argprintf (&runner, "%s/${mastervol}_${remotehost}_${slavevol}/${eSlave}.pid", georepdir);
         runner_add_args (&runner, ".", ".", NULL);
         RUN_GSYNCD_CMD;
 
         /* state-file */
         runinit_gsyncd_setrx (&runner, conf);
         runner_add_arg (&runner, "state-file");
-        runner_argprintf (&runner, "%s/${mastervol}/${eSlave}.status", georepdir);
+        runner_argprintf (&runner, "%s/${mastervol}_${remotehost}_${slavevol}/${eSlave}.status", georepdir);
+        runner_add_args (&runner, ".", ".", NULL);
+        RUN_GSYNCD_CMD;
+
+        /* state-detail-file */
+        runinit_gsyncd_setrx (&runner, conf);
+        runner_add_arg (&runner, "state-detail-file");
+        runner_argprintf (&runner, "%s/${mastervol}_${remotehost}_${slavevol}/${eSlave}-detail.status",
+                          georepdir);
+        runner_add_args (&runner, ".", ".", NULL);
+        RUN_GSYNCD_CMD;
+
+        /* state-detail-file */
+        runinit_gsyncd_setrx (&runner, conf);
+        runner_add_arg (&runner, "state-detail-file");
+        runner_argprintf (&runner, "%s/${mastervol}_${remotehost}_${slavevol}/${eSlave}-detail.status",
+                          georepdir);
         runner_add_args (&runner, ".", ".", NULL);
         RUN_GSYNCD_CMD;
 
@@ -632,10 +668,32 @@ configure_syncdaemon (glusterd_conf_t *conf)
         runinit_gsyncd_setrx (&runner, conf);
         runner_add_args (&runner,
                          "gluster-log-file",
-                         DEFAULT_LOG_FILE_DIRECTORY"/"GEOREP"/${mastervol}/${eSlave}.gluster.log",
+                         DEFAULT_LOG_FILE_DIRECTORY"/"GEOREP"/${mastervol}/${eSlave}${local_id}.gluster.log",
                          ".", ".", NULL);
         RUN_GSYNCD_CMD;
 
+        /* ignore-deletes */
+        runinit_gsyncd_setrx (&runner, conf);
+        runner_add_args (&runner, "ignore-deletes", "true", ".", ".", NULL);
+        RUN_GSYNCD_CMD;
+
+        /* special-sync-mode */
+        runinit_gsyncd_setrx (&runner, conf);
+        runner_add_args (&runner, "special-sync-mode", "partial", ".", ".", NULL);
+        RUN_GSYNCD_CMD;
+
+        /* change-detector == changelog */
+        runinit_gsyncd_setrx (&runner, conf);
+        runner_add_args(&runner, "change-detector", "changelog", ".", ".", NULL);
+        RUN_GSYNCD_CMD;
+
+        runinit_gsyncd_setrx (&runner, conf);
+        runner_add_arg(&runner, "working-dir");
+        runner_argprintf(&runner, "%s/${mastervol}/${eSlave}",
+                         DEFAULT_VAR_RUN_DIRECTORY);
+        runner_add_args (&runner, ".", ".", NULL);
+        RUN_GSYNCD_CMD;
+
         /************
          * slave pre-configuration
          ************/
@@ -649,7 +707,7 @@ configure_syncdaemon (glusterd_conf_t *conf)
         /* gluster-params */
         runinit_gsyncd_setrx (&runner, conf);
         runner_add_args (&runner, "gluster-params",
-                         "xlator-option=*-dht.assert-no-child-down=true",
+                         "aux-gfid-mount xlator-option=*-dht.assert-no-child-down=true",
                          ".", NULL);
         RUN_GSYNCD_CMD;
 
@@ -868,27 +926,212 @@ _install_mount_spec (dict_t *opts, char *key, data_t *value, void *data)
         return -1;
 }
 
+
 static int
-glusterd_default_synctask_cbk (int ret, call_frame_t *frame, void *opaque)
+gd_default_synctask_cbk (int ret, call_frame_t *frame, void *opaque)
+{
+        glusterd_conf_t     *priv = THIS->private;
+        synclock_unlock (&priv->big_lock);
+        return ret;
+}
+
+static void
+glusterd_launch_synctask (synctask_fn_t fn, void *opaque)
+{
+        xlator_t        *this = NULL;
+        glusterd_conf_t *priv = NULL;
+        int             ret   = -1;
+
+        this = THIS;
+        priv = this->private;
+
+        synclock_lock (&priv->big_lock);
+        ret = synctask_new (this->ctx->env, fn, gd_default_synctask_cbk, NULL,
+                            opaque);
+        if (ret)
+                gf_log (this->name, GF_LOG_CRITICAL, "Failed to spawn bricks"
+                        " and other volume related services");
+}
+
+int
+glusterd_uds_rpcsvc_notify (rpcsvc_t *rpc, void *xl, rpcsvc_event_t event,
+                            void *data)
+{
+        /* glusterd_rpcsvc_notify() does stuff that calls coming in from the
+         * unix domain socket don't need. This is just an empty function to be
+         * used for the uds listener. This will be used later if required.
+         */
+        return 0;
+}
+
+/* The glusterd unix domain socket listener only listens for cli */
+rpcsvc_t *
+glusterd_init_uds_listener (xlator_t *this)
+{
+        int             ret = -1;
+        dict_t          *options = NULL;
+        rpcsvc_t        *rpc = NULL;
+        data_t          *sock_data = NULL;
+        char            sockfile[PATH_MAX+1] = {0,};
+        int             i = 0;
+
+
+        GF_ASSERT (this);
+
+        sock_data = dict_get (this->options, "glusterd-sockfile");
+        if (!sock_data) {
+                strncpy (sockfile, DEFAULT_GLUSTERD_SOCKFILE, PATH_MAX);
+        } else {
+                strncpy (sockfile, sock_data->data, PATH_MAX);
+        }
+
+        options = dict_new ();
+        if (!options)
+                goto out;
+
+        ret = rpcsvc_transport_unix_options_build (&options, sockfile);
+        if (ret)
+                goto out;
+
+        rpc = rpcsvc_init (this, this->ctx, options, 8);
+        if (rpc == NULL) {
+                ret = -1;
+                goto out;
+        }
+
+        ret = rpcsvc_register_notify (rpc, glusterd_uds_rpcsvc_notify,
+                                      this);
+        if (ret) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        "Failed to register notify function");
+                goto out;
+        }
+
+        ret = rpcsvc_create_listeners (rpc, options, this->name);
+        if (ret != 1) {
+                gf_log (this->name, GF_LOG_DEBUG, "Failed to create listener");
+                goto out;
+        }
+        ret = 0;
+
+        for (i = 0; i < gd_uds_programs_count; i++) {
+                ret = glusterd_program_register (this, rpc, gd_uds_programs[i]);
+                if (ret) {
+                        i--;
+                        for (; i >= 0; i--)
+                                rpcsvc_program_unregister (rpc,
+                                                           gd_uds_programs[i]);
+
+                        goto out;
+                }
+        }
+
+out:
+        if (options)
+                dict_unref (options);
+
+        if (ret) {
+                gf_log (this->name, GF_LOG_ERROR, "Failed to start glusterd "
+                        "unix domain socket listener.");
+                if (rpc) {
+                        GF_FREE (rpc);
+                        rpc = NULL;
+                }
+        }
+        return rpc;
+}
+
+void
+glusterd_stop_uds_listener (xlator_t *this)
 {
-    return ret;
+        glusterd_conf_t         *conf = NULL;
+        rpcsvc_listener_t       *listener = NULL;
+        rpcsvc_listener_t       *next = NULL;
+
+        GF_ASSERT (this);
+        conf = this->private;
+
+        (void) rpcsvc_program_unregister (conf->uds_rpc, &gd_svc_cli_prog);
+        (void) rpcsvc_program_unregister (conf->uds_rpc, &gluster_handshake_prog);
+
+        list_for_each_entry_safe (listener, next, &conf->uds_rpc->listeners,
+                                  list) {
+                rpcsvc_listener_destroy (listener);
+        }
+
+        (void) rpcsvc_unregister_notify (conf->uds_rpc, glusterd_rpcsvc_notify,
+                                         this);
+
+        unlink (DEFAULT_GLUSTERD_SOCKFILE);
+
+        GF_FREE (conf->uds_rpc);
+        conf->uds_rpc = NULL;
+
+        return;
 }
 
 static int
-glusterd_launch_synctask (xlator_t *this, synctask_fn_t fn)
+glusterd_init_snap_folder (xlator_t *this)
 {
-    glusterd_conf_t *priv = NULL;
-    int              ret  = -1;
+        int             ret = -1;
+        struct stat     buf = {0,};
+
+        GF_ASSERT (this);
+
+        /* Snapshot volumes are mounted under /var/run/gluster/snaps folder.
+         * But /var/run is normally a symbolic link to /run folder, which
+         * creates problems as the entry point in the mtab for the mount point
+         * and glusterd maintained entry point will be different. Therefore
+         * identify the correct run folder and use it for snap volume mounting.
+         */
+        ret = lstat (GLUSTERD_VAR_RUN_DIR, &buf);
+        if (ret != 0) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "stat fails on %s, exiting. (errno = %d)",
+                        GLUSTERD_VAR_RUN_DIR, errno);
+                goto out;
+        }
 
-    priv = this->private;
+        /* If /var/run is symlink then use /run folder */
+        if (S_ISLNK (buf.st_mode)) {
+                strcpy (snap_mount_folder, GLUSTERD_RUN_DIR);
+        } else {
+                strcpy (snap_mount_folder, GLUSTERD_VAR_RUN_DIR);
+        }
 
-    ret = synctask_new (this->ctx->env, fn,
-                        glusterd_default_synctask_cbk, NULL, priv);
+        strcat (snap_mount_folder, GLUSTERD_DEFAULT_SNAPS_BRICK_DIR);
 
-    if (ret)
-            gf_log (this->name, GF_LOG_CRITICAL, "Failed to create synctask"
-                    "for starting process");
-    return ret;
+        ret = stat (snap_mount_folder, &buf);
+        if ((ret != 0) && (ENOENT != errno)) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "stat fails on %s, exiting. (errno = %d)",
+                        snap_mount_folder, errno);
+                ret = -1;
+                goto out;
+        }
+
+        if ((!ret) && (!S_ISDIR(buf.st_mode))) {
+                gf_log (this->name, GF_LOG_CRITICAL,
+                        "Provided snap path %s is not a directory,"
+                        "exiting", snap_mount_folder);
+                ret = -1;
+                goto out;
+        }
+
+        if ((-1 == ret) && (ENOENT == errno)) {
+                /* Create missing folders */
+                ret = mkdir_p (snap_mount_folder, 0777, _gf_false);
+
+                if (-1 == ret) {
+                        gf_log (this->name, GF_LOG_CRITICAL,
+                                "Unable to create directory %s"
+                                " ,errno = %d", snap_mount_folder, errno);
+                        goto out;
+                }
+        }
+
+out:
+        return ret;
 }
 
 /*
@@ -902,6 +1145,7 @@ init (xlator_t *this)
 {
         int32_t            ret               = -1;
         rpcsvc_t          *rpc               = NULL;
+        rpcsvc_t          *uds_rpc           = NULL;
         glusterd_conf_t   *conf              = NULL;
         data_t            *dir_data          = NULL;
         struct stat        buf               = {0,};
@@ -912,10 +1156,8 @@ init (xlator_t *this)
         int                first_time        = 0;
         char              *mountbroker_root  = NULL;
         int                i                 = 0;
-
-#ifdef DEBUG
         char              *valgrind_str      = NULL;
-#endif
+
         dir_data = dict_get (this->options, "working-directory");
 
         if (!dir_data) {
@@ -929,7 +1171,7 @@ init (xlator_t *this)
         if ((ret != 0) && (ENOENT != errno)) {
                 gf_log (this->name, GF_LOG_ERROR,
                         "stat fails on %s, exiting. (errno = %d)",
-			workdir, errno);
+                        workdir, errno);
                 exit (1);
         }
 
@@ -954,9 +1196,17 @@ init (xlator_t *this)
                 first_time = 1;
         }
 
+        setenv ("GLUSTERD_WORKING_DIR", workdir, 1);
         gf_log (this->name, GF_LOG_INFO, "Using %s as working directory",
                 workdir);
 
+        ret = glusterd_init_snap_folder (this);
+        if (ret) {
+                gf_log (this->name, GF_LOG_CRITICAL, "Unable to create "
+                        "snap backend folder");
+                 exit (1);
+         }
+
         snprintf (cmd_log_filename, PATH_MAX,"%s/.cmd_log_history",
                   DEFAULT_LOG_FILE_DIRECTORY);
         ret = gf_cmd_log_init (cmd_log_filename);
@@ -1054,18 +1304,29 @@ init (xlator_t *this)
                 goto out;
         }
 
-        for (i = 0; i < rpcsvc_programs_count; i++) {
-                ret = glusterd_program_register (this, rpc, all_programs[i]);
+        for (i = 0; i < gd_inet_programs_count; i++) {
+                ret = glusterd_program_register (this, rpc,
+                                                 gd_inet_programs[i]);
                 if (ret) {
                         i--;
                         for (; i >= 0; i--)
                                 rpcsvc_program_unregister (rpc,
-                                                           all_programs[i]);
+                                                           gd_inet_programs[i]);
 
                         goto out;
                 }
         }
 
+        /* Start a unix domain socket listener just for cli commands
+         * This should prevent ports from being wasted by being in TIMED_WAIT
+         * when cli commands are done continuously
+         */
+        uds_rpc = glusterd_init_uds_listener (this);
+        if (uds_rpc == NULL) {
+                ret = -1;
+                goto out;
+        }
+
         conf = GF_CALLOC (1, sizeof (glusterd_conf_t),
                           gf_gld_mt_glusterd_conf_t);
         GF_VALIDATE_OR_GOTO(this->name, conf, out);
@@ -1078,17 +1339,24 @@ init (xlator_t *this)
 
         INIT_LIST_HEAD (&conf->peers);
         INIT_LIST_HEAD (&conf->volumes);
+        INIT_LIST_HEAD (&conf->snapshots);
+        INIT_LIST_HEAD (&conf->missed_snaps_list);
+
         pthread_mutex_init (&conf->mutex, NULL);
         conf->rpc = rpc;
+        conf->uds_rpc = uds_rpc;
         conf->gfs_mgmt = &gd_brick_prog;
         strncpy (conf->workdir, workdir, PATH_MAX);
 
+        synclock_init (&conf->big_lock);
         pthread_mutex_init (&conf->xprt_lock, NULL);
         INIT_LIST_HEAD (&conf->xprt_list);
 
         glusterd_friend_sm_init ();
         glusterd_op_sm_init ();
         glusterd_opinfo_init ();
+        glusterd_mgmt_v3_lock_init ();
+        glusterd_txn_opinfo_dict_init ();
         ret = glusterd_sm_tr_log_init (&conf->op_sm_log,
                                        glusterd_op_sm_state_name_get,
                                        glusterd_op_sm_event_name_get,
@@ -1096,8 +1364,13 @@ init (xlator_t *this)
         if (ret)
                 goto out;
 
+         conf->base_port = GF_IANA_PRIV_PORTS_START;
+         if (dict_get_uint32(this->options, "base-port", &conf->base_port) == 0) {
+                 gf_log (this->name, GF_LOG_INFO,
+                         "base-port override: %d", conf->base_port);
+         }
+
         /* Set option to run bricks on valgrind if enabled in glusterd.vol */
-#ifdef DEBUG
         conf->valgrind = _gf_false;
         ret = dict_get_str (this->options, "run-with-valgrind", &valgrind_str);
         if (ret < 0) {
@@ -1110,7 +1383,6 @@ init (xlator_t *this)
                                 "run-with-valgrind value not a boolean string");
                 }
         }
-#endif
 
         this->private = conf;
         (void) glusterd_nodesvc_set_online_status ("glustershd", _gf_false);
@@ -1147,6 +1419,13 @@ init (xlator_t *this)
         if (ret < 0)
                 goto out;
 
+        /* If there are no 'friends', this would be the best time to
+         * spawn process/bricks that may need (re)starting since last
+         * time (this) glusterd was up.*/
+
+        if (list_empty (&conf->peers)) {
+                glusterd_launch_synctask (glusterd_spawn_daemons, NULL);
+        }
         ret = glusterd_options_init (this);
         if (ret < 0)
                 goto out;
@@ -1155,13 +1434,6 @@ init (xlator_t *this)
         if (ret)
                 goto out;
 
-        glusterd_launch_synctask (this,
-                                  (synctask_fn_t) glusterd_restart_bricks);
-        glusterd_launch_synctask (this,
-                                  (synctask_fn_t) glusterd_restart_gsyncds);
-        glusterd_launch_synctask (this,
-                                  (synctask_fn_t) glusterd_restart_rebalance);
-
         ret = glusterd_hooks_spawn_worker (this);
         if (ret)
                 goto out;
@@ -1197,11 +1469,17 @@ fini (xlator_t *this)
                 goto out;
 
         conf = this->private;
+
+        glusterd_stop_uds_listener (this);
+
         FREE (conf->pmap);
         if (conf->handle)
-                glusterd_store_handle_destroy (conf->handle);
+                gf_store_handle_destroy (conf->handle);
         glusterd_sm_tr_log_delete (&conf->op_sm_log);
+        glusterd_mgmt_v3_lock_fini ();
+        glusterd_txn_opinfo_dict_fini ();
         GF_FREE (conf);
+
         this->private = NULL;
 out:
         return;
@@ -1288,11 +1566,9 @@ struct volume_options options[] = {
         { .key = {GEOREP"-log-group"},
           .type = GF_OPTION_TYPE_ANY,
         },
-#ifdef DEBUG
         { .key = {"run-with-valgrind"},
           .type = GF_OPTION_TYPE_BOOL,
         },
-#endif
         { .key = {"server-quorum-type"},
           .type = GF_OPTION_TYPE_STR,
           .value = { "none", "server"},
@@ -1304,5 +1580,18 @@ struct volume_options options[] = {
           .description = "Sets the quorum percentage for the trusted "
           "storage pool."
         },
+        { .key = {"glusterd-sockfile"},
+          .type = GF_OPTION_TYPE_PATH,
+          .description = "The socket file on which glusterd should listen for "
+                        "cli requests. Default is "DEFAULT_GLUSTERD_SOCKFILE "."
+        },
+        { .key = {"base-port"},
+          .type = GF_OPTION_TYPE_INT,
+          .description = "Sets the base port for portmap query"
+        },
+        { .key = {"snap-brick-path"},
+          .type = GF_OPTION_TYPE_STR,
+          .description = "directory where the bricks for the snapshots will be created"
+        },
         { .key   = {NULL} },
 };
diff --git a/xlators/mgmt/glusterd/src/glusterd.h b/xlators/mgmt/glusterd/src/glusterd.h
index c9e8d42d3..3aa395ebc 100644
--- a/xlators/mgmt/glusterd/src/glusterd.h
+++ b/xlators/mgmt/glusterd/src/glusterd.h
@@ -1,5 +1,5 @@
 /*
-   Copyright (c) 2006-2012 Red Hat, Inc. <http://www.redhat.com>
+   Copyright (c) 2006-2013 Red Hat, Inc. <http://www.redhat.com>
    This file is part of GlusterFS.
 
    This file is licensed to you under your choice of the GNU Lesser
@@ -37,16 +37,24 @@
 #include "glusterd-pmap.h"
 #include "cli1-xdr.h"
 #include "syncop.h"
+#include "store.h"
 
 #define GLUSTERD_MAX_VOLUME_NAME        1000
-#define DEFAULT_LOG_FILE_DIRECTORY      DATADIR "/log/glusterfs"
 #define GLUSTERD_TR_LOG_SIZE            50
 #define GLUSTERD_NAME                   "glusterd"
 #define GLUSTERD_SOCKET_LISTEN_BACKLOG  128
 #define GLUSTERD_QUORUM_TYPE_KEY        "cluster.server-quorum-type"
 #define GLUSTERD_QUORUM_RATIO_KEY       "cluster.server-quorum-ratio"
 #define GLUSTERD_GLOBAL_OPT_VERSION     "global-option-version"
+#define GLUSTERD_COMMON_PEM_PUB_FILE    "/geo-replication/common_secret.pem.pub"
+#define GEO_CONF_MAX_OPT_VALS           5
+#define GLUSTERD_CREATE_HOOK_SCRIPT     "/hooks/1/gsync-create/post/" \
+                                        "S56glusterd-geo-rep-create-post.sh"
 
+
+#define GLUSTERD_SNAPS_MAX_HARD_LIMIT 256
+#define GLUSTERD_SNAPS_DEF_SOFT_LIMIT_PERCENT 90
+#define GLUSTERD_SNAPS_MAX_SOFT_LIMIT_PERCENT 100
 #define GLUSTERD_SERVER_QUORUM "server"
 
 #define FMTSTR_CHECK_VOL_EXISTS "Volume %s does not exist"
@@ -67,6 +75,9 @@
 struct glusterd_volinfo_;
 typedef struct glusterd_volinfo_ glusterd_volinfo_t;
 
+struct glusterd_snap_;
+typedef struct glusterd_snap_ glusterd_snap_t;
+
 typedef enum glusterd_op_ {
         GD_OP_NONE = 0,
         GD_OP_CREATE_VOLUME,
@@ -93,26 +104,22 @@ typedef enum glusterd_op_ {
         GD_OP_LIST_VOLUME,
         GD_OP_CLEARLOCKS_VOLUME,
         GD_OP_DEFRAG_BRICK_VOLUME,
-        GD_OP_BD_OP,
+        GD_OP_COPY_FILE,
+        GD_OP_SYS_EXEC,
+        GD_OP_GSYNC_CREATE,
+        GD_OP_SNAP,
         GD_OP_MAX,
 } glusterd_op_t;
 
 extern const char * gd_op_list[];
-struct glusterd_store_iter_ {
-        int     fd;
-        FILE    *file;
-        char    filepath[PATH_MAX];
-};
-
-typedef struct glusterd_store_iter_     glusterd_store_iter_t;
 
 struct glusterd_volgen {
         dict_t *dict;
 };
 
 typedef struct {
-        struct rpc_clnt         *rpc;
-        gf_boolean_t            online;
+        struct rpc_clnt  *rpc;
+        gf_boolean_t      online;
 } nodesrv_t;
 
 typedef struct {
@@ -122,37 +129,45 @@ typedef struct {
 } gd_global_opts_t;
 
 typedef struct {
-        struct _volfile_ctx *volfile;
-	pthread_mutex_t   mutex;
-	struct list_head  peers;
-	struct list_head  xaction_peers;
-        gf_boolean_t      verify_volfile_checksum;
-        gf_boolean_t      trace;
-        uuid_t            uuid;
-        char              workdir[PATH_MAX];
-        rpcsvc_t          *rpc;
-        nodesrv_t         *shd;
-        nodesrv_t         *nfs;
-        struct pmap_registry *pmap;
-        struct list_head  volumes;
-        pthread_mutex_t   xprt_lock;
-        struct list_head  xprt_list;
-        glusterd_store_handle_t *handle;
-        gf_timer_t *timer;
-        glusterd_sm_tr_log_t op_sm_log;
-        struct rpc_clnt_program *gfs_mgmt;
-
-        struct list_head mount_specs;
-#ifdef DEBUG
-        gf_boolean_t      valgrind;
-#endif
-        pthread_t       brick_thread;
-        void           *hooks_priv;
+        struct _volfile_ctx      *volfile;
+        pthread_mutex_t           mutex;
+        struct list_head          peers;
+        struct list_head          xaction_peers;
+        gf_boolean_t              verify_volfile_checksum;
+        gf_boolean_t              trace;
+        uuid_t                    uuid;
+        char                      workdir[PATH_MAX];
+        rpcsvc_t                 *rpc;
+        nodesrv_t                *shd;
+        nodesrv_t                *nfs;
+        struct pmap_registry     *pmap;
+        struct list_head          volumes;
+        struct list_head          snapshots; /*List of snap volumes */
+        pthread_mutex_t           xprt_lock;
+        struct list_head          xprt_list;
+        gf_store_handle_t        *handle;
+        gf_timer_t               *timer;
+        glusterd_sm_tr_log_t      op_sm_log;
+        struct rpc_clnt_program  *gfs_mgmt;
+
+        struct list_head           mount_specs;
+        gf_boolean_t               valgrind;
+        pthread_t                  brick_thread;
+        void                      *hooks_priv;
         /* need for proper handshake_t */
-        int             op_version; /* Starts with 1 for 3.3.0 */
-        xlator_t       *xl;  /* Should be set to 'THIS' before creating thread */
-        gf_boolean_t   pending_quorum_action;
-        dict_t             *opts;
+        int                        op_version; /* Starts with 1 for 3.3.0 */
+        xlator_t                  *xl;  /* Should be set to 'THIS' before creating thread */
+        gf_boolean_t               pending_quorum_action;
+        dict_t                    *opts;
+        synclock_t                 big_lock;
+        gf_boolean_t               restart_done;
+        rpcsvc_t                  *uds_rpc; /* RPCSVC for the unix domain socket */
+        uint32_t                   base_port;
+        uint64_t                   snap_max_hard_limit;
+        uint64_t                   snap_max_soft_limit;
+        char                      *snap_bricks_directory;
+        gf_store_handle_t         *missed_snaps_list_shandle;
+        struct list_head           missed_snaps_list;
 } glusterd_conf_t;
 
 
@@ -162,18 +177,22 @@ typedef enum gf_brick_status {
 } gf_brick_status_t;
 
 struct glusterd_brickinfo {
-        char    hostname[1024];
-        char    path[PATH_MAX];
-        struct list_head  brick_list;
-        uuid_t  uuid;
-        int     port;
-        int     rdma_port;
-        char   *logfile;
-        gf_boolean_t signed_in;
-        glusterd_store_handle_t *shandle;
-        gf_brick_status_t status;
-        struct rpc_clnt *rpc;
-        int decommissioned;
+        char               hostname[1024];
+        char               path[PATH_MAX];
+        char               device_path[PATH_MAX];
+        struct list_head   brick_list;
+        uuid_t             uuid;
+        int                port;
+        int                rdma_port;
+        char              *logfile;
+        gf_boolean_t       signed_in;
+        gf_store_handle_t *shandle;
+        gf_brick_status_t  status;
+        struct rpc_clnt   *rpc;
+        int                decommissioned;
+        char vg[PATH_MAX]; /* FIXME: Use max size for length of vg */
+        int     caps; /* Capability */
+        int32_t            snap_status;
 };
 
 typedef struct glusterd_brickinfo glusterd_brickinfo_t;
@@ -196,7 +215,7 @@ struct glusterd_defrag_info_ {
         int                          cmd;
         pthread_t                    th;
         gf_defrag_status_t           defrag_status;
-        struct rpc_clnt            * rpc;
+        struct rpc_clnt             *rpc;
         uint32_t                     connected;
         char                         mount[1024];
         char                         databuf[131072];
@@ -229,80 +248,147 @@ struct _auth {
 
 typedef struct _auth auth_t;
 
-typedef enum glusterd_vol_backend_ {
-        GD_VOL_BK_DEFAULT = 0, /* POSIX */
-        GD_VOL_BK_BD = 1,
-} glusterd_vol_backend_t;
+/* Capabilities of xlator */
+#define CAPS_BD               0x00000001
+#define CAPS_THIN             0x00000002
+#define CAPS_OFFLOAD_COPY     0x00000004
+#define CAPS_OFFLOAD_SNAPSHOT 0x00000008
 
 struct glusterd_rebalance_ {
-        gf_defrag_status_t      defrag_status;
-        uint64_t                rebalance_files;
-        uint64_t                rebalance_data;
-        uint64_t                lookedup_files;
+        gf_defrag_status_t       defrag_status;
+        uint64_t                 rebalance_files;
+        uint64_t                 rebalance_data;
+        uint64_t                 lookedup_files;
+        uint64_t                 skipped_files;
         glusterd_defrag_info_t  *defrag;
-        gf_cli_defrag_type      defrag_cmd;
-        uint64_t                rebalance_failures;
-        uuid_t                  rebalance_id;
-        double                  rebalance_time;
-        glusterd_op_t           op;
+        gf_cli_defrag_type       defrag_cmd;
+        uint64_t                 rebalance_failures;
+        uuid_t                   rebalance_id;
+        double                   rebalance_time;
+        glusterd_op_t            op;
+        dict_t                  *dict; /* Dict to store misc information
+                                        * like list of bricks being removed */
 };
 
 typedef struct glusterd_rebalance_ glusterd_rebalance_t;
 
 struct glusterd_replace_brick_ {
         gf_rb_status_t          rb_status;
-        glusterd_brickinfo_t    *src_brick;
-        glusterd_brickinfo_t    *dst_brick;
+        glusterd_brickinfo_t   *src_brick;
+        glusterd_brickinfo_t   *dst_brick;
         uuid_t                  rb_id;
 };
 
 typedef struct glusterd_replace_brick_ glusterd_replace_brick_t;
 
 struct glusterd_volinfo_ {
-        char                    volname[GLUSTERD_MAX_VOLUME_NAME];
-        int                     type;
-        int                     brick_count;
-        struct list_head        vol_list;
-        struct list_head        bricks;
-        glusterd_volume_status  status;
-        int                     sub_count;  /* backward compatibility */
-        int                     stripe_count;
-        int                     replica_count;
-        int                     subvol_count; /* Number of subvolumes in a
+        gf_lock_t                 lock;
+        char                      volname[GLUSTERD_MAX_VOLUME_NAME];
+        gf_boolean_t              is_snap_volume;
+        glusterd_snap_t          *snapshot;
+        gf_boolean_t              is_volume_restored;
+        char                      parent_volname[GLUSTERD_MAX_VOLUME_NAME];
+                                         /* In case of a snap volume
+                                            i.e (is_snap_volume == TRUE) this
+                                            field will contain the name of
+                                            the volume which is snapped. In
+                                            case of a non-snap volume, this
+                                            field will be initialized as N/A */
+        int                       type;
+        int                       brick_count;
+        uint64_t                  snap_count;
+        uint64_t                  snap_max_hard_limit;
+        struct list_head          vol_list;
+                                      /* In case of a snap volume
+                                         i.e (is_snap_volume == TRUE) this
+                                         is linked to glusterd_snap_t->volumes.
+                                         In case of a non-snap volume, this is
+                                         linked to glusterd_conf_t->volumes */
+        struct list_head          snapvol_list;
+                                      /* This is a current pointer for
+                                         glusterd_volinfo_t->snap_volumes */
+        struct list_head          bricks;
+        struct list_head          snap_volumes;
+                                      /* TODO : Need to remove this, as this
+                                       * is already part of snapshot object.
+                                       */
+        glusterd_volume_status    status;
+        int                       sub_count;  /* backward compatibility */
+        int                       stripe_count;
+        int                       replica_count;
+        int                       subvol_count; /* Number of subvolumes in a
                                                  distribute volume */
-        int                     dist_leaf_count; /* Number of bricks in one
+        int                       dist_leaf_count; /* Number of bricks in one
                                                     distribute subvolume */
-        int                     port;
-        glusterd_store_handle_t *shandle;
-        glusterd_store_handle_t *rb_shandle;
-        glusterd_store_handle_t *node_state_shandle;
+        int                       port;
+        gf_store_handle_t        *shandle;
+        gf_store_handle_t        *rb_shandle;
+        gf_store_handle_t        *node_state_shandle;
 
         /* Defrag/rebalance related */
-        glusterd_rebalance_t    rebal;
+        glusterd_rebalance_t      rebal;
 
         /* Replace brick status */
-        glusterd_replace_brick_t rep_brick;
+        glusterd_replace_brick_t  rep_brick;
+
+        int                       version;
+        uint32_t                  cksum;
+        gf_transport_type         transport_type;
+        gf_transport_type         nfs_transport_type;
 
-        int                     version;
-        uint32_t                cksum;
-        gf_transport_type       transport_type;
-        gf_transport_type   nfs_transport_type;
+        dict_t                   *dict;
 
-        dict_t                  *dict;
+        uuid_t                    volume_id;
+        auth_t                    auth;
+        char                     *logdir;
 
-        uuid_t                  volume_id;
-        auth_t                  auth;
-        char                    *logdir;
+        dict_t                   *gsync_slaves;
 
-        dict_t                  *gsync_slaves;
+        int                       decommission_in_progress;
+        xlator_t                 *xl;
 
-        int                      decommission_in_progress;
-        xlator_t                *xl;
+        gf_boolean_t              memory_accounting;
+        int                      caps; /* Capability */
+
+        int                       op_version;
+        int                       client_op_version;
+};
 
-        gf_boolean_t             memory_accounting;
-        glusterd_vol_backend_t   backend;
+typedef enum gd_snap_status_ {
+        GD_SNAP_STATUS_NONE,
+        GD_SNAP_STATUS_INIT,
+        GD_SNAP_STATUS_IN_USE,
+        GD_SNAP_STATUS_DECOMMISSION,
+        GD_SNAP_STATUS_RESTORED,
+} gd_snap_status_t;
+
+struct glusterd_snap_ {
+        gf_lock_t                lock;
+        struct  list_head        volumes;
+        struct  list_head        snap_list;
+        char                     snapname[GLUSTERD_MAX_SNAP_NAME];
+        uuid_t                   snap_id;
+        char                    *description;
+        time_t                   time_stamp;
+        gf_boolean_t             snap_restored;
+        gd_snap_status_t         snap_status;
+        gf_store_handle_t       *shandle;
 };
 
+typedef struct glusterd_snap_op_ {
+        int32_t                brick_num;
+        char                  *brick_path;
+        int32_t                op;
+        int32_t                status;
+        struct list_head       snap_ops_list;
+} glusterd_snap_op_t;
+
+typedef struct glusterd_missed_snap_ {
+        char                   *node_snap_info;
+        struct list_head        missed_snaps;
+        struct list_head        snap_ops;
+} glusterd_missed_snap_info;
+
 typedef enum gd_node_type_ {
         GD_NODE_NONE,
         GD_NODE_BRICK,
@@ -311,6 +397,12 @@ typedef enum gd_node_type_ {
         GD_NODE_NFS,
 } gd_node_type;
 
+typedef enum missed_snap_stat {
+        GD_MISSED_SNAP_NONE,
+        GD_MISSED_SNAP_PENDING,
+        GD_MISSED_SNAP_DONE,
+} missed_snap_stat;
+
 typedef struct glusterd_pending_node_ {
         struct list_head list;
         void   *node;
@@ -318,6 +410,13 @@ typedef struct glusterd_pending_node_ {
         int32_t index;
 } glusterd_pending_node_t;
 
+struct gsync_config_opt_vals_ {
+        char           *op_name;
+        int             no_of_pos_vals;
+        gf_boolean_t    case_sensitive;
+        char           *values[GEO_CONF_MAX_OPT_VALS];
+};
+
 enum glusterd_op_ret {
         GLUSTERD_CONNECTION_AWAITED = 100,
 };
@@ -335,10 +434,18 @@ enum glusterd_vol_comp_status_ {
 #define GLUSTERD_VOLUME_DIR_PREFIX "vols"
 #define GLUSTERD_PEER_DIR_PREFIX "peers"
 #define GLUSTERD_VOLUME_INFO_FILE "info"
+#define GLUSTERD_SNAP_INFO_FILE "info"
 #define GLUSTERD_VOLUME_RBSTATE_FILE "rbstate"
 #define GLUSTERD_BRICK_INFO_DIR "bricks"
 #define GLUSTERD_CKSUM_FILE "cksum"
+#define GLUSTERD_TRASH "trash"
 #define GLUSTERD_NODE_STATE_FILE "node_state.info"
+#define GLUSTERD_MISSED_SNAPS_LIST_FILE "missed_snaps_list"
+#define GLUSTERD_VOL_SNAP_DIR_PREFIX "snaps"
+
+#define GLUSTERD_DEFAULT_SNAPS_BRICK_DIR        "/gluster/snaps"
+#define GLUSTERD_VAR_RUN_DIR                    "/var/run"
+#define GLUSTERD_RUN_DIR                        "/run"
 
 /* definitions related to replace brick */
 #define RB_CLIENT_MOUNTPOINT    "rb_mount"
@@ -351,14 +458,29 @@ enum glusterd_vol_comp_status_ {
 
 typedef ssize_t (*gd_serialize_t) (struct iovec outmsg, void *args);
 
-#define GLUSTERD_GET_VOLUME_DIR(path, volinfo, priv) \
-        snprintf (path, PATH_MAX, "%s/vols/%s", priv->workdir,\
-                  volinfo->volname);
+#define GLUSTERD_GET_VOLUME_DIR(path, volinfo, priv)                       \
+        if (volinfo->is_snap_volume) {                                     \
+                snprintf (path, PATH_MAX, "%s/snaps/%s/%s", priv->workdir, \
+                          volinfo->snapshot->snapname, volinfo->volname);  \
+        } else {                                                           \
+                snprintf (path, PATH_MAX, "%s/vols/%s", priv->workdir,     \
+                          volinfo->volname);                               \
+        }
 
-#define GLUSTERD_GET_BRICK_DIR(path, volinfo, priv) \
-        snprintf (path, PATH_MAX, "%s/%s/%s/%s", priv->workdir,\
-                  GLUSTERD_VOLUME_DIR_PREFIX, volinfo->volname, \
-                  GLUSTERD_BRICK_INFO_DIR);
+#define GLUSTERD_GET_SNAP_DIR(path, snap, priv)                           \
+                snprintf (path, PATH_MAX, "%s/snaps/%s", priv->workdir,   \
+                          snap->snapname);
+
+#define GLUSTERD_GET_BRICK_DIR(path, volinfo, priv)                           \
+        if (volinfo->is_snap_volume) {                                        \
+                snprintf (path, PATH_MAX, "%s/snaps/%s/%s/%s", priv->workdir, \
+                          volinfo->snapshot->snapname, volinfo->volname,      \
+                          GLUSTERD_BRICK_INFO_DIR);                           \
+        } else {                                                              \
+                snprintf (path, PATH_MAX, "%s/%s/%s/%s", priv->workdir,       \
+                          GLUSTERD_VOLUME_DIR_PREFIX, volinfo->volname,       \
+                          GLUSTERD_BRICK_INFO_DIR);                           \
+        }
 
 #define GLUSTERD_GET_NFS_DIR(path, priv) \
         snprintf (path, PATH_MAX, "%s/nfs", priv->workdir);
@@ -372,12 +494,14 @@ typedef ssize_t (*gd_serialize_t) (struct iovec outmsg, void *args);
                 }                                                       \
         } while (0)
 
-#define GLUSTERD_GET_BRICK_PIDFILE(pidfile,volpath,hostname,brickpath) { \
-                char exp_path[PATH_MAX] = {0,};                         \
-                GLUSTERD_REMOVE_SLASH_FROM_PATH (brickpath, exp_path);  \
-                snprintf (pidfile, PATH_MAX, "%s/run/%s-%s.pid",        \
-                          volpath, hostname, exp_path);                 \
-        }
+#define GLUSTERD_GET_BRICK_PIDFILE(pidfile,volinfo,brickinfo, priv) do {      \
+                char exp_path[PATH_MAX] = {0,};                               \
+                char volpath[PATH_MAX]  = {0,};                               \
+                GLUSTERD_GET_VOLUME_DIR (volpath, volinfo, priv);             \
+                GLUSTERD_REMOVE_SLASH_FROM_PATH (brickinfo->path, exp_path);  \
+                snprintf (pidfile, PATH_MAX, "%s/run/%s-%s.pid",              \
+                          volpath, brickinfo->hostname, exp_path);      \
+        } while (0)
 
 #define GLUSTERD_GET_NFS_PIDFILE(pidfile,nfspath) {                     \
                 snprintf (pidfile, PATH_MAX, "%s/run/nfs.pid",          \
@@ -385,9 +509,9 @@ typedef ssize_t (*gd_serialize_t) (struct iovec outmsg, void *args);
         }
 
 #define GLUSTERD_STACK_DESTROY(frame) do {\
-		frame->local = NULL;	  \
-		STACK_DESTROY (frame->root);\
-	} while (0)
+                frame->local = NULL;                                    \
+                STACK_DESTROY (frame->root);                            \
+        } while (0)
 
 #define GLUSTERD_GET_DEFRAG_DIR(path, volinfo, priv) do {               \
                 char vol_path[PATH_MAX];                                \
@@ -409,6 +533,19 @@ typedef ssize_t (*gd_serialize_t) (struct iovec outmsg, void *args);
                            uuid_utoa(MY_UUID));                         \
         } while (0)
 
+#define GLUSTERD_GET_UUID_NOHYPHEN(ret_string, uuid) do {               \
+                char *snap_volname_ptr = ret_string;                    \
+                char *snap_volid_ptr = uuid_utoa(uuid);                 \
+                while (*snap_volid_ptr) {                               \
+                        if (*snap_volid_ptr == '-') {                   \
+                                snap_volid_ptr++;                       \
+                        } else {                                        \
+                                (*snap_volname_ptr++) =                 \
+                                (*snap_volid_ptr++);                    \
+                        }                                               \
+                }                                                       \
+                *snap_volname_ptr = '\0';                               \
+        } while (0)
 
 int glusterd_uuid_init();
 
@@ -419,22 +556,34 @@ int glusterd_uuid_generate_save ();
 static inline unsigned char *
 __glusterd_uuid()
 {
-	glusterd_conf_t *priv = THIS->private;
+        glusterd_conf_t *priv = THIS->private;
 
-	if (uuid_is_null (priv->uuid))
-		glusterd_uuid_init();
-	return &priv->uuid[0];
+        if (uuid_is_null (priv->uuid))
+                glusterd_uuid_init();
+        return &priv->uuid[0];
 }
 
+int glusterd_big_locked_notify (struct rpc_clnt *rpc, void *mydata,
+                                rpc_clnt_event_t event,
+                                void *data, rpc_clnt_notify_t notify_fn);
+
+int
+glusterd_big_locked_cbk (struct rpc_req *req, struct iovec *iov,
+                         int count, void *myframe, fop_cbk_fn_t fn);
+
+int glusterd_big_locked_handler (rpcsvc_request_t *req, rpcsvc_actor actor_fn);
+
 int32_t
 glusterd_brick_from_brickinfo (glusterd_brickinfo_t *brickinfo,
                                char **new_brick);
 int
-glusterd_probe_begin (rpcsvc_request_t *req, const char *hoststr, int port);
+glusterd_probe_begin (rpcsvc_request_t *req, const char *hoststr, int port,
+                      dict_t *dict);
 
 int
-glusterd_xfer_friend_add_resp (rpcsvc_request_t *req, char *hostname,
-                               int port, int32_t op_ret, int32_t op_errno);
+glusterd_xfer_friend_add_resp (rpcsvc_request_t *req, char *myhostname,
+                               char *remote_hostname, int port, int32_t op_ret,
+                               int32_t op_errno);
 
 int
 glusterd_friend_find (uuid_t uuid, char *hostname,
@@ -459,6 +608,14 @@ int
 glusterd_op_unlock_send_resp (rpcsvc_request_t *req, int32_t status);
 
 int
+glusterd_op_mgmt_v3_lock_send_resp (rpcsvc_request_t *req,
+                                    uuid_t *txn_id, int32_t status);
+
+int
+glusterd_op_mgmt_v3_unlock_send_resp (rpcsvc_request_t *req,
+                                      uuid_t *txn_id, int32_t status);
+
+int
 glusterd_op_stage_send_resp (rpcsvc_request_t *req,
                              int32_t op, int32_t status,
                              char *op_errstr, dict_t *rsp_dict);
@@ -503,7 +660,7 @@ glusterd_handle_defrag_volume_v2 (rpcsvc_request_t *req);
 int
 glusterd_xfer_cli_probe_resp (rpcsvc_request_t *req, int32_t op_ret,
                               int32_t op_errno, char *op_errstr, char *hostname,
-                              int port);
+                              int port, dict_t *dict);
 
 int
 glusterd_op_commit_send_resp (rpcsvc_request_t *req,
@@ -515,7 +672,7 @@ glusterd_xfer_friend_remove_resp (rpcsvc_request_t *req, char *hostname, int por
 
 int
 glusterd_deprobe_begin (rpcsvc_request_t *req, const char *hoststr, int port,
-                        uuid_t uuid);
+                        uuid_t uuid, dict_t *dict);
 
 int
 glusterd_handle_cli_deprobe (rpcsvc_request_t *req);
@@ -590,6 +747,12 @@ int
 glusterd_handle_reset_volume (rpcsvc_request_t *req);
 
 int
+glusterd_handle_copy_file (rpcsvc_request_t *req);
+
+int
+glusterd_handle_sys_exec (rpcsvc_request_t *req);
+
+int
 glusterd_handle_gsync_set (rpcsvc_request_t *req);
 
 int
@@ -601,7 +764,7 @@ glusterd_handle_fsm_log (rpcsvc_request_t *req);
 int
 glusterd_xfer_cli_deprobe_resp (rpcsvc_request_t *req, int32_t op_ret,
                                 int32_t op_errno, char *op_errstr,
-                                char *hostname);
+                                char *hostname, dict_t *dict);
 
 int
 glusterd_fetchspec_notify (xlator_t *this);
@@ -668,11 +831,20 @@ int glusterd_handle_cli_heal_volume (rpcsvc_request_t *req);
 
 int glusterd_handle_cli_list_volume (rpcsvc_request_t *req);
 
+int
+glusterd_handle_snapshot (rpcsvc_request_t *req);
+
 /* op-sm functions */
 int glusterd_op_stage_heal_volume (dict_t *dict, char **op_errstr);
 int glusterd_op_heal_volume (dict_t *dict, char **op_errstr);
 int glusterd_op_stage_gsync_set (dict_t *dict, char **op_errstr);
 int glusterd_op_gsync_set (dict_t *dict, char **op_errstr, dict_t *rsp_dict);
+int glusterd_op_stage_copy_file (dict_t *dict, char **op_errstr);
+int glusterd_op_copy_file (dict_t *dict, char **op_errstr);
+int glusterd_op_stage_sys_exec (dict_t *dict, char **op_errstr);
+int glusterd_op_sys_exec (dict_t *dict, char **op_errstr, dict_t *rsp_dict);
+int glusterd_op_stage_gsync_create (dict_t *dict, char **op_errstr);
+int glusterd_op_gsync_create (dict_t *dict, char **op_errstr, dict_t *rsp_dict);
 int glusterd_op_quota (dict_t *dict, char **op_errstr, dict_t *rsp_dict);
 int glusterd_op_stage_quota (dict_t *dict, char **op_errstr);
 int glusterd_op_stage_replace_brick (dict_t *dict, char **op_errstr,
@@ -703,7 +875,6 @@ int glusterd_op_statedump_volume (dict_t *dict, char **op_errstr);
 int glusterd_op_stage_clearlocks_volume (dict_t *dict, char **op_errstr);
 int glusterd_op_clearlocks_volume (dict_t *dict, char **op_errstr,
                                    dict_t *rsp_dict);
-int glusterd_op_stage_bd (dict_t *dict, char **op_errstr);
 
 /* misc */
 void glusterd_do_replace_brick (void *data);
@@ -714,10 +885,68 @@ int glusterd_op_statedump_volume_args_get (dict_t *dict, char **volname,
                                            char **options, int *option_cnt);
 
 int glusterd_op_gsync_args_get (dict_t *dict, char **op_errstr,
-                                char **master, char **slave);
+                                char **master, char **slave, char **host_uuid);
+int glusterd_stop_volume (glusterd_volinfo_t *volinfo);
+
 /* Synctask part */
 int32_t glusterd_op_begin_synctask (rpcsvc_request_t *req, glusterd_op_t op,
                                     void *dict);
 int32_t
 glusterd_defrag_event_notify_handle (dict_t *dict);
+
+int32_t
+glusterd_txn_opinfo_dict_init ();
+
+void
+glusterd_txn_opinfo_dict_fini ();
+
+void
+glusterd_txn_opinfo_init ();
+
+/* snapshot */
+glusterd_snap_t*
+glusterd_new_snap_object();
+
+int32_t
+glusterd_list_add_snapvol (glusterd_volinfo_t *origin_vol,
+                           glusterd_volinfo_t *snap_vol);
+
+glusterd_snap_t*
+glusterd_remove_snap_by_id (uuid_t snap_id);
+
+glusterd_snap_t*
+glusterd_remove_snap_by_name (char *snap_name);
+
+glusterd_snap_t*
+glusterd_find_snap_by_name (char *snap_name);
+
+glusterd_snap_t*
+glusterd_find_snap_by_id (uuid_t snap_id);
+
+int
+glusterd_snapshot_prevalidate (dict_t *dict, char **op_errstr,
+                               dict_t *rsp_dict);
+int
+glusterd_snapshot_brickop (dict_t *dict, char **op_errstr, dict_t *rsp_dict);
+int
+glusterd_snapshot (dict_t *dict, char **op_errstr, dict_t *rsp_dict);
+int
+glusterd_snapshot_postvalidate (dict_t *dict, int32_t op_ret, char **op_errstr,
+                                dict_t *rsp_dict);
+char *
+glusterd_build_snap_device_path (char *device, char *snapname);
+int32_t
+glusterd_snap_remove (dict_t *rsp_dict, glusterd_snap_t *snap,
+                      gf_boolean_t remove_lvm, gf_boolean_t force);
+int32_t
+glusterd_snapshot_cleanup (dict_t *dict, char **op_errstr, dict_t *rsp_dict);
+
+int32_t
+glusterd_add_missed_snaps_to_list (dict_t *dict, int32_t missed_snap_count);
+
+int32_t
+glusterd_store_missed_snaps_list (char *missed_info, int32_t brick_num,
+                                  char *brick_path, int32_t snap_op,
+                                  int32_t snap_status);
+
 #endif
diff --git a/xlators/mount/fuse/src/fuse-bridge.c b/xlators/mount/fuse/src/fuse-bridge.c
index 9f84779ae..6a5587c2d 100644
--- a/xlators/mount/fuse/src/fuse-bridge.c
+++ b/xlators/mount/fuse/src/fuse-bridge.c
@@ -11,6 +11,8 @@
 #include <sys/wait.h>
 #include "fuse-bridge.h"
 #include "mount-gluster-compat.h"
+#include "glusterfs.h"
+#include "glusterfs-acl.h"
 
 #ifdef __NetBSD__
 #undef open /* in perfuse.h, pulled from mount-gluster-compat.h */
@@ -51,6 +53,46 @@ fuse_invalidate(xlator_t *this, inode_t *inode)
         return 0;
 }
 
+static int32_t
+fuse_forget_cbk (xlator_t *this, inode_t *inode)
+{
+        //Nothing to free in inode ctx, hence return.
+        return 0;
+}
+
+void
+fuse_inode_set_need_lookup (inode_t *inode, xlator_t *this)
+{
+	uint64_t          need_lookup = 1;
+
+	if (!inode || !this)
+		return;
+
+	inode_ctx_set (inode, this, &need_lookup);
+
+	return;
+}
+
+
+gf_boolean_t
+fuse_inode_needs_lookup (inode_t *inode, xlator_t *this)
+{
+	uint64_t          need_lookup = 0;
+	gf_boolean_t      ret = _gf_false;
+
+	if (!inode || !this)
+		return ret;
+
+	inode_ctx_get (inode, this, &need_lookup);
+	if (need_lookup)
+		ret = _gf_true;
+	need_lookup = 0;
+	inode_ctx_set (inode, this, &need_lookup);
+
+	return ret;
+}
+
+
 fuse_fd_ctx_t *
 __fuse_fd_ctx_check_n_create (xlator_t *this, fd_t *fd)
 {
@@ -371,7 +413,7 @@ fuse_entry_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
 
         if (op_ret == 0) {
                 gf_log ("glusterfs-fuse", GF_LOG_TRACE,
-                        "%"PRIu64": %s() %s => %"PRId64,
+                        "%"PRIu64": %s() %s => %"PRIu64,
                         frame->root->unique, gf_fop_list[frame->root->op],
                         state->loc.path, buf->ia_ino);
 
@@ -463,6 +505,13 @@ fuse_lookup_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
 
         if (op_ret == -1 && state->is_revalidate == 1) {
                 itable = state->itable;
+		/*
+		 * A stale mapping might exist for a dentry/inode that has been
+		 * removed from another client.
+		 */
+		if (op_errno == ENOENT)
+			inode_unlink(state->loc.inode, state->loc.parent,
+				     state->loc.name);
                 inode_unref (state->loc.inode);
                 state->loc.inode = inode_new (itable);
                 state->is_revalidate = 2;
@@ -522,8 +571,8 @@ fuse_lookup_resume (fuse_state_t *state)
 static void
 fuse_lookup (xlator_t *this, fuse_in_header_t *finh, void *msg)
 {
-        char         *name      = msg;
-        fuse_state_t *state     = NULL;
+        char           *name     = msg;
+        fuse_state_t   *state    = NULL;
 
         GET_STATE (this, finh, state);
 
@@ -531,15 +580,27 @@ fuse_lookup (xlator_t *this, fuse_in_header_t *finh, void *msg)
                                         finh->nodeid, name);
 
         fuse_resolve_and_resume (state, fuse_lookup_resume);
+
+        return;
+}
+
+static inline void
+do_forget(xlator_t *this, uint64_t unique, uint64_t nodeid, uint64_t nlookup)
+{
+	inode_t *fuse_inode = fuse_ino_to_inode(nodeid, this);
+
+	fuse_log_eh(this, "%"PRIu64": FORGET %"PRIu64"/%"PRIu64" gfid: (%s)",
+		    unique, nodeid, nlookup, uuid_utoa(fuse_inode->gfid));
+
+	inode_forget(fuse_inode, nlookup);
+	inode_unref(fuse_inode);
 }
 
 static void
 fuse_forget (xlator_t *this, fuse_in_header_t *finh, void *msg)
 
 {
-        struct fuse_forget_in *ffi = msg;
-
-        inode_t      *fuse_inode;
+        struct fuse_forget_in *ffi        = msg;
 
         if (finh->nodeid == 1) {
                 GF_FREE (finh);
@@ -550,16 +611,29 @@ fuse_forget (xlator_t *this, fuse_in_header_t *finh, void *msg)
                 "%"PRIu64": FORGET %"PRIu64"/%"PRIu64,
                 finh->unique, finh->nodeid, ffi->nlookup);
 
-        fuse_inode = fuse_ino_to_inode (finh->nodeid, this);
+	do_forget(this, finh->unique, finh->nodeid, ffi->nlookup);
 
-        fuse_log_eh (this, "%"PRIu64": FORGET %"PRIu64"/%"PRIu64" gfid: (%s)",
-                     finh->unique, finh->nodeid, ffi->nlookup,
-                     uuid_utoa (fuse_inode->gfid));
+        GF_FREE (finh);
+}
 
-        inode_forget (fuse_inode, ffi->nlookup);
-        inode_unref (fuse_inode);
+static void
+fuse_batch_forget(xlator_t *this, fuse_in_header_t *finh, void *msg)
+{
+	struct fuse_batch_forget_in *fbfi = msg;
+	struct fuse_forget_one *ffo = (struct fuse_forget_one *) (fbfi + 1);
+	int i;
 
-        GF_FREE (finh);
+	gf_log("glusterfs-fuse", GF_LOG_TRACE,
+		"%"PRIu64": BATCH_FORGET %"PRIu64"/%"PRIu32,
+		finh->unique, finh->nodeid, fbfi->count);
+
+	for (i = 0; i < fbfi->count; i++) {
+                if (ffo[i].nodeid == 1)
+                        continue;
+		do_forget(this, finh->unique, ffo[i].nodeid, ffo[i].nlookup);
+        }
+
+	GF_FREE(finh);
 }
 
 static int
@@ -580,7 +654,7 @@ fuse_truncate_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
 
         if (op_ret == 0) {
                 gf_log ("glusterfs-fuse", GF_LOG_TRACE,
-                        "%"PRIu64": %s() %s => %"PRId64, frame->root->unique,
+                        "%"PRIu64": %s() %s => %"PRIu64, frame->root->unique,
                         gf_fop_list[frame->root->op],
                         state->loc.path ? state->loc.path : "ERR",
                         prebuf->ia_ino);
@@ -635,7 +709,7 @@ fuse_attr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                    state->loc.inode ? uuid_utoa (state->loc.inode->gfid) : "");
         if (op_ret == 0) {
                 gf_log ("glusterfs-fuse", GF_LOG_TRACE,
-                        "%"PRIu64": %s() %s => %"PRId64, frame->root->unique,
+                        "%"PRIu64": %s() %s => %"PRIu64, frame->root->unique,
                         gf_fop_list[frame->root->op],
                         state->loc.path ? state->loc.path : "ERR",
                         buf->ia_ino);
@@ -920,7 +994,7 @@ fuse_setattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
 
         if (op_ret == 0) {
                 gf_log ("glusterfs-fuse", GF_LOG_TRACE,
-                        "%"PRIu64": %s() %s => %"PRId64, frame->root->unique,
+                        "%"PRIu64": %s() %s => %"PRIu64, frame->root->unique,
                         gf_fop_list[frame->root->op],
                         state->loc.path ? state->loc.path : "ERR",
                         statpost->ia_ino);
@@ -1318,7 +1392,7 @@ fuse_mknod_resume (fuse_state_t *state)
 {
         if (!state->loc.parent) {
                 gf_log ("glusterfs-fuse", GF_LOG_ERROR,
-                        "MKNOD %"PRId64"/%s (%s/%s) resolution failed",
+                        "MKNOD %"PRIu64"/%s (%s/%s) resolution failed",
                         state->finh->nodeid, state->resolve.bname,
                         uuid_utoa (state->resolve.gfid), state->resolve.bname);
                 send_fuse_err (state->this, state->finh, ENOENT);
@@ -1388,7 +1462,7 @@ fuse_mkdir_resume (fuse_state_t *state)
 {
         if (!state->loc.parent) {
                 gf_log ("glusterfs-fuse", GF_LOG_ERROR,
-                        "MKDIR %"PRId64" (%s/%s) resolution failed",
+                        "MKDIR %"PRIu64" (%s/%s) resolution failed",
                         state->finh->nodeid, uuid_utoa (state->resolve.gfid),
                         state->resolve.bname);
                 send_fuse_err (state->this, state->finh, ENOENT);
@@ -1450,7 +1524,7 @@ fuse_unlink_resume (fuse_state_t *state)
 {
         if (!state->loc.parent || !state->loc.inode) {
                 gf_log ("glusterfs-fuse", GF_LOG_ERROR,
-                        "UNLINK %"PRId64" (%s/%s) resolution failed",
+                        "UNLINK %"PRIu64" (%s/%s) resolution failed",
                         state->finh->nodeid, uuid_utoa (state->resolve.gfid),
                         state->resolve.bname);
                 send_fuse_err (state->this, state->finh, ENOENT);
@@ -1486,7 +1560,7 @@ fuse_rmdir_resume (fuse_state_t *state)
 {
         if (!state->loc.parent || !state->loc.inode) {
                 gf_log ("glusterfs-fuse", GF_LOG_ERROR,
-                        "RMDIR %"PRId64" (%s/%s) resolution failed",
+                        "RMDIR %"PRIu64" (%s/%s) resolution failed",
                         state->finh->nodeid, uuid_utoa (state->resolve.gfid),
                         state->resolve.bname);
                 send_fuse_err (state->this, state->finh, ENOENT);
@@ -1522,7 +1596,7 @@ fuse_symlink_resume (fuse_state_t *state)
 {
         if (!state->loc.parent) {
                 gf_log ("glusterfs-fuse", GF_LOG_ERROR,
-                        "SYMLINK %"PRId64" (%s/%s) -> %s resolution failed",
+                        "SYMLINK %"PRIu64" (%s/%s) -> %s resolution failed",
                         state->finh->nodeid, uuid_utoa (state->resolve.gfid),
                         state->resolve.bname, state->name);
                 send_fuse_err (state->this, state->finh, ENOENT);
@@ -1595,7 +1669,7 @@ fuse_rename_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
 
         if (op_ret == 0) {
                 gf_log ("glusterfs-fuse", GF_LOG_TRACE,
-                        "%"PRIu64": %s -> %s => 0 (buf->ia_ino=%"PRId64")",
+                        "%"PRIu64": %s -> %s => 0 (buf->ia_ino=%"PRIu64")",
                         frame->root->unique, state->loc.path, state->loc2.path,
                         buf->ia_ino);
 
@@ -1770,7 +1844,7 @@ fuse_create_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                         foo.open_flags |= FOPEN_DIRECT_IO;
 
                 gf_log ("glusterfs-fuse", GF_LOG_TRACE,
-                        "%"PRIu64": %s() %s => %p (ino=%"PRId64")",
+                        "%"PRIu64": %s() %s => %p (ino=%"PRIu64")",
                         frame->root->unique, gf_fop_list[frame->root->op],
                         state->loc.path, fd, buf->ia_ino);
 
@@ -2029,7 +2103,7 @@ fuse_readv_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
 
         if (op_ret >= 0) {
                 gf_log ("glusterfs-fuse", GF_LOG_TRACE,
-                        "%"PRIu64": READ => %d/%"GF_PRI_SIZET",%"PRId64"/%"PRId64,
+                        "%"PRIu64": READ => %d/%"GF_PRI_SIZET",%"PRId64"/%"PRIu64,
                         frame->root->unique,
                         op_ret, state->size, state->off, stbuf->ia_size);
 
@@ -2115,7 +2189,7 @@ fuse_writev_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
 
         if (op_ret >= 0) {
                 gf_log ("glusterfs-fuse", GF_LOG_TRACE,
-                        "%"PRIu64": WRITE => %d/%"GF_PRI_SIZET",%"PRId64"/%"PRId64,
+                        "%"PRIu64": WRITE => %d/%"GF_PRI_SIZET",%"PRId64"/%"PRIu64,
                         frame->root->unique,
                         op_ret, state->size, state->off, stbuf->ia_size);
 
@@ -2157,7 +2231,7 @@ fuse_write_resume (fuse_state_t *state)
         iobref_add (iobref, iobuf);
 
         gf_log ("glusterfs-fuse", GF_LOG_TRACE,
-                "%"PRIu64": WRITE (%p, size=%"PRId64", offset=%"PRId64")",
+                "%"PRIu64": WRITE (%p, size=%"GF_PRI_SIZET", offset=%"PRId64")",
                 state->finh->unique, state->fd, state->size, state->off);
 
         FUSE_FOP (state, fuse_writev_cbk, GF_FOP_WRITE, writev, state->fd,
@@ -2495,7 +2569,7 @@ void
 fuse_readdir_resume (fuse_state_t *state)
 {
         gf_log ("glusterfs-fuse", GF_LOG_TRACE,
-                "%"PRIu64": READDIR (%p, size=%zu, offset=%"PRId64")",
+                "%"PRIu64": READDIR (%p, size=%"GF_PRI_SIZET", offset=%"PRId64")",
                 state->finh->unique, state->fd, state->size, state->off);
 
         FUSE_FOP (state, fuse_readdir_cbk, GF_FOP_READDIR,
@@ -2600,6 +2674,8 @@ fuse_readdirp_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
 
 		feo->nodeid = inode_to_fuse_nodeid (linked_inode);
 
+		fuse_inode_set_need_lookup (linked_inode, this);
+
 		inode_unref (linked_inode);
 
 		feo->entry_valid =
@@ -2626,7 +2702,7 @@ void
 fuse_readdirp_resume (fuse_state_t *state)
 {
 	gf_log ("glusterfs-fuse", GF_LOG_TRACE,
-		"%"PRIu64": READDIRP (%p, size=%zu, offset=%"PRId64")",
+		"%"PRIu64": READDIRP (%p, size=%"GF_PRI_SIZET", offset=%"PRId64")",
 		state->finh->unique, state->fd, state->size, state->off);
 
 	FUSE_FOP (state, fuse_readdirp_cbk, GF_FOP_READDIRP,
@@ -2653,6 +2729,47 @@ fuse_readdirp (xlator_t *this, fuse_in_header_t *finh, void *msg)
 	fuse_resolve_and_resume (state, fuse_readdirp_resume);
 }
 
+static int
+fuse_fallocate_cbk(call_frame_t *frame, void *cookie, xlator_t *this,
+		   int32_t op_ret, int32_t op_errno, struct iatt *prebuf,
+		   struct iatt *postbuf, dict_t *xdata)
+{
+	return fuse_err_cbk(frame, cookie, this, op_ret, op_errno, xdata);
+}
+
+static void
+fuse_fallocate_resume(fuse_state_t *state)
+{
+	gf_log("glusterfs-fuse", GF_LOG_TRACE,
+	       "%"PRIu64": FALLOCATE (%p, flags=%d, size=%zu, offset=%"PRId64")",
+	       state->finh->unique, state->fd, state->flags, state->size,
+	       state->off);
+
+	if (state->flags & FALLOC_FL_PUNCH_HOLE)
+		FUSE_FOP(state, fuse_fallocate_cbk, GF_FOP_DISCARD, discard,
+			 state->fd, state->off, state->size, state->xdata);
+	else
+		FUSE_FOP(state, fuse_fallocate_cbk, GF_FOP_FALLOCATE, fallocate,
+			 state->fd, (state->flags & FALLOC_FL_KEEP_SIZE),
+			 state->off, state->size, state->xdata);
+}
+
+static void
+fuse_fallocate(xlator_t *this, fuse_in_header_t *finh, void *msg)
+{
+	struct fuse_fallocate_in *ffi = msg;
+	fuse_state_t *state = NULL;
+
+	GET_STATE(this, finh, state);
+	state->off = ffi->offset;
+	state->size = ffi->length;
+	state->flags = ffi->mode;
+	state->fd = FH_TO_FD(ffi->fh);
+
+	fuse_resolve_fd_init(state, &state->resolve, state->fd);
+	fuse_resolve_and_resume(state, fuse_fallocate_resume);
+}
+
 
 static void
 fuse_releasedir (xlator_t *this, fuse_in_header_t *finh, void *msg)
@@ -2895,8 +3012,8 @@ fuse_setxattr (xlator_t *this, fuse_in_header_t *finh, void *msg)
         }
 
         if (!priv->acl) {
-                if ((strcmp (name, "system.posix_acl_access") == 0) ||
-                    (strcmp (name, "system.posix_acl_default") == 0)) {
+                if ((strcmp (name, POSIX_ACL_ACCESS_XATTR) == 0) ||
+                    (strcmp (name, POSIX_ACL_DEFAULT_XATTR) == 0)) {
                         send_fuse_err (this, finh, EOPNOTSUPP);
                         GF_FREE (finh);
                         return;
@@ -3120,6 +3237,8 @@ out:
 void
 fuse_getxattr_resume (fuse_state_t *state)
 {
+        char *value  = NULL;
+
         if (!state->loc.inode) {
                 gf_log ("glusterfs-fuse", GF_LOG_WARNING,
                         "%"PRIu64": GETXATTR %s/%"PRIu64" (%s) "
@@ -3137,6 +3256,46 @@ fuse_getxattr_resume (fuse_state_t *state)
         state->fd = fd_lookup (state->loc.inode, state->finh->pid);
 #endif /* GF_TEST_FFOP */
 
+        if (state->name &&
+            (strcmp (state->name, VIRTUAL_GFID_XATTR_KEY) == 0)) {
+                /* send glusterfs gfid in binary form */
+
+                value = GF_CALLOC (16 + 1, sizeof(char),
+                                   gf_common_mt_char);
+                if (!value) {
+                        send_fuse_err (state->this, state->finh, ENOMEM);
+                        goto internal_out;
+                }
+                memcpy (value, state->loc.inode->gfid, 16);
+
+                send_fuse_xattr (THIS, state->finh, value, 16, state->size);
+                GF_FREE (value);
+        internal_out:
+                free_fuse_state (state);
+                return;
+        }
+
+        if (state->name &&
+            (strcmp (state->name, VIRTUAL_GFID_XATTR_KEY_STR) == 0)) {
+                /* transform binary gfid to canonical form */
+
+                value = GF_CALLOC (UUID_CANONICAL_FORM_LEN + 1, sizeof(char),
+                                   gf_common_mt_char);
+                if (!value) {
+                        send_fuse_err (state->this, state->finh, ENOMEM);
+                        goto internal_out1;
+                }
+                uuid_utoa_r (state->loc.inode->gfid, value);
+
+                send_fuse_xattr (THIS, state->finh, value,
+                                 UUID_CANONICAL_FORM_LEN, state->size);
+                GF_FREE (value);
+        internal_out1:
+                free_fuse_state (state);
+                return;
+        }
+
+
         if (state->fd) {
                 gf_log ("glusterfs-fuse", GF_LOG_TRACE,
                         "%"PRIu64": GETXATTR %p/%"PRIu64" (%s)", state->finh->unique,
@@ -3158,15 +3317,16 @@ fuse_getxattr_resume (fuse_state_t *state)
 static void
 fuse_getxattr (xlator_t *this, fuse_in_header_t *finh, void *msg)
 {
-        struct fuse_getxattr_in *fgxi = msg;
-        char         *name = (char *)(fgxi + 1);
-
-        fuse_state_t *state = NULL;
-        struct fuse_private *priv = NULL;
-        int rv = 0;
-        char *newkey = NULL;
+        struct fuse_getxattr_in *fgxi     = msg;
+        char                    *name     = (char *)(fgxi + 1);
+        fuse_state_t            *state    = NULL;
+        struct fuse_private     *priv     = NULL;
+        int                      rv       = 0;
+        int                     op_errno  = EINVAL;
+        char                    *newkey   = NULL;
 
         priv = this->private;
+        GET_STATE (this, finh, state);
 
 #ifdef GF_DARWIN_HOST_OS
         if (fgxi->position) {
@@ -3182,26 +3342,23 @@ fuse_getxattr (xlator_t *this, fuse_in_header_t *finh, void *msg)
                         "%"PRIu64": GETXATTR %s/%"PRIu64" (%s):"
                         "refusing positioned getxattr",
                         finh->unique, state->loc.path, finh->nodeid, name);
-                send_fuse_err (this, finh, EINVAL);
-                FREE (finh);
-                return;
+                op_errno = EINVAL;
+                goto err;
         }
 #endif
 
         if (!priv->acl) {
-                if ((strcmp (name, "system.posix_acl_access") == 0) ||
-                    (strcmp (name, "system.posix_acl_default") == 0)) {
-                        send_fuse_err (this, finh, ENOTSUP);
-                        GF_FREE (finh);
-                        return;
+                if ((strcmp (name, POSIX_ACL_ACCESS_XATTR) == 0) ||
+                    (strcmp (name, POSIX_ACL_DEFAULT_XATTR) == 0)) {
+                        op_errno = ENOTSUP;
+                        goto err;
                 }
         }
 
         if (!priv->selinux) {
                 if (strncmp (name, "security.", 9) == 0) {
-                        send_fuse_err (this, finh, ENODATA);
-                        GF_FREE (finh);
-                        return;
+                        op_errno = ENODATA;
+                        goto err;
                 }
         }
 
@@ -3211,16 +3368,19 @@ fuse_getxattr (xlator_t *this, fuse_in_header_t *finh, void *msg)
 
         rv = fuse_flip_xattr_ns (priv, name, &newkey);
         if (rv) {
-                send_fuse_err (this, finh, ENOMEM);
-                free_fuse_state (state);
-                goto out;
+                op_errno = ENOMEM;
+                goto err;
         }
 
         state->size = fgxi->size;
         state->name = newkey;
 
         fuse_resolve_and_resume (state, fuse_getxattr_resume);
- out:
+
+        return;
+ err:
+        send_fuse_err (this, finh, op_errno);
+        free_fuse_state (state);
         return;
 }
 
@@ -3607,6 +3767,10 @@ fuse_init (xlator_t *this, fuse_in_header_t *finh, void *msg)
         fino.max_readahead = 1 << 17;
         fino.max_write = 1 << 17;
         fino.flags = FUSE_ASYNC_READ | FUSE_POSIX_LOCKS;
+#if FUSE_KERNEL_MINOR_VERSION >= 17
+	if (fini->minor >= 17)
+		fino.flags |= FUSE_FLOCK_LOCKS;
+#endif
 #if FUSE_KERNEL_MINOR_VERSION >= 12
         if (fini->minor >= 12) {
             /* let fuse leave the umask processing to us, so that it does not
@@ -3635,8 +3799,8 @@ fuse_init (xlator_t *this, fuse_in_header_t *finh, void *msg)
                 }
                 priv->revchan_in  = pfd[0];
                 priv->revchan_out = pfd[1];
-                ret = pthread_create (&messenger, NULL, notify_kernel_loop,
-                                      this);
+                ret = gf_thread_create (&messenger, NULL, notify_kernel_loop,
+					this);
                 if (ret != 0) {
                         gf_log ("glusterfs-fuse", GF_LOG_ERROR,
                                 "failed to start messenger daemon (%s)",
@@ -3668,8 +3832,47 @@ fuse_init (xlator_t *this, fuse_in_header_t *finh, void *msg)
         if (fini->minor < 9)
                 *priv->msg0_len_p = sizeof(*finh) + FUSE_COMPAT_WRITE_IN_SIZE;
 #endif
-	if (fini->flags & FUSE_DO_READDIRPLUS)
-		fino.flags |= FUSE_DO_READDIRPLUS;
+        if (priv->use_readdirp) {
+                if (fini->flags & FUSE_DO_READDIRPLUS)
+                        fino.flags |= FUSE_DO_READDIRPLUS;
+        }
+
+	if (priv->fopen_keep_cache == 2) {
+		/* If user did not explicitly set --fopen-keep-cache[=off],
+		   then check if kernel support FUSE_AUTO_INVAL_DATA and ...
+		*/
+		if (fini->flags & FUSE_AUTO_INVAL_DATA) {
+			/* ... enable fopen_keep_cache mode if supported.
+			*/
+			gf_log ("glusterfs-fuse", GF_LOG_DEBUG, "Detected "
+				"support for FUSE_AUTO_INVAL_DATA. Enabling "
+				"fopen_keep_cache automatically.");
+			fino.flags |= FUSE_AUTO_INVAL_DATA;
+			priv->fopen_keep_cache = 1;
+		} else {
+			gf_log ("glusterfs-fuse", GF_LOG_DEBUG, "No support "
+				"for FUSE_AUTO_INVAL_DATA. Disabling "
+				"fopen_keep_cache.");
+			/* ... else disable. */
+			priv->fopen_keep_cache = 0;
+		}
+	} else if (priv->fopen_keep_cache == 1) {
+		/* If user explicitly set --fopen-keep-cache[=on],
+		   then enable FUSE_AUTO_INVAL_DATA if possible.
+		*/
+		if (fini->flags & FUSE_AUTO_INVAL_DATA) {
+			gf_log ("glusterfs-fuse", GF_LOG_DEBUG, "fopen_keep_cache "
+				"is explicitly set. Enabling FUSE_AUTO_INVAL_DATA");
+			fino.flags |= FUSE_AUTO_INVAL_DATA;
+		} else {
+			gf_log ("glusterfs-fuse", GF_LOG_WARNING, "fopen_keep_cache "
+				"is explicitly set. Support for "
+				"FUSE_AUTO_INVAL_DATA is missing");
+		}
+	}
+
+	if (fini->flags & FUSE_ASYNC_DIO)
+		fino.flags |= FUSE_ASYNC_DIO;
 
         ret = send_fuse_obj (this, finh, &fino);
         if (ret == 0)
@@ -3905,6 +4108,7 @@ fuse_migrate_fd_open (xlator_t *this, fd_t *basefd, fd_t *oldfd,
                 goto out;
         }
 
+        newfd->flags = basefd->flags;
 	if (newfd->lk_ctx)
 		fd_lk_ctx_unref (newfd->lk_ctx);
 
@@ -4641,6 +4845,7 @@ fuse_priv_dump (xlator_t  *this)
                             (int)private->strict_volfile_check);
         gf_proc_dump_write("reverse_thread_started", "%d",
                            (int)private->reverse_fuse_thread_started);
+        gf_proc_dump_write("use_readdirp", "%d", private->use_readdirp);
 
         return 0;
 }
@@ -4769,8 +4974,8 @@ notify (xlator_t *this, int32_t event, void *data, ...)
                 if (!private->fuse_thread_started) {
                         private->fuse_thread_started = 1;
 
-                        ret = pthread_create (&private->fuse_thread, NULL,
-                                              fuse_thread_proc, this);
+                        ret = gf_thread_create (&private->fuse_thread, NULL,
+						fuse_thread_proc, this);
                         if (ret != 0) {
                                 gf_log (this->name, GF_LOG_DEBUG,
                                         "pthread_create() failed (%s)",
@@ -4857,8 +5062,8 @@ static fuse_handler_t *fuse_std_ops[FUSE_OP_HIGH] = {
      /* [FUSE_IOCTL] */
      /* [FUSE_POLL] */
      /* [FUSE_NOTIFY_REPLY] */
-     /* [FUSE_BATCH_FORGET] */
-     /* [FUSE_FALLOCATE] */
+	[FUSE_BATCH_FORGET]= fuse_batch_forget,
+	[FUSE_FALLOCATE]   = fuse_fallocate,
 	[FUSE_READDIRPLUS] = fuse_readdirp,
 };
 
@@ -4910,6 +5115,7 @@ init (xlator_t *this_xl)
         int                fsname_allocated = 0;
         glusterfs_ctx_t   *ctx = NULL;
         gf_boolean_t       sync_to_mount = _gf_false;
+        gf_boolean_t       fopen_keep_cache = _gf_false;
         unsigned long      mntflags = 0;
         char              *mnt_args = NULL;
         eh_t              *event = NULL;
@@ -5028,6 +5234,8 @@ init (xlator_t *this_xl)
 
         GF_OPTION_INIT ("enable-ino32", priv->enable_ino32, bool, cleanup_exit);
 
+        GF_OPTION_INIT ("use-readdirp", priv->use_readdirp, bool, cleanup_exit);
+
         priv->fuse_dump_fd = -1;
         ret = dict_get_str (options, "dump-fuse", &value_string);
         if (ret == 0) {
@@ -5053,8 +5261,12 @@ init (xlator_t *this_xl)
                 GF_ASSERT (ret == 0);
         }
 
-        GF_OPTION_INIT("fopen-keep-cache", priv->fopen_keep_cache, bool,
-                cleanup_exit);
+	priv->fopen_keep_cache = 2;
+	if (dict_get (options, "fopen-keep-cache")) {
+		GF_OPTION_INIT("fopen-keep-cache", fopen_keep_cache, bool,
+			       cleanup_exit);
+		priv->fopen_keep_cache = fopen_keep_cache;
+	}
 
         GF_OPTION_INIT("gid-timeout", priv->gid_cache_timeout, int32,
                 cleanup_exit);
@@ -5143,7 +5355,7 @@ init (xlator_t *this_xl)
         if (priv->fd == -1)
                 goto cleanup_exit;
 
-        event = eh_new (FUSE_EVENT_HISTORY_SIZE, _gf_false);
+        event = eh_new (FUSE_EVENT_HISTORY_SIZE, _gf_false, NULL);
         if (!event) {
                 gf_log (this_xl->name, GF_LOG_ERROR,
                         "could not create a new event history");
@@ -5225,6 +5437,7 @@ struct xlator_fops fops;
 
 struct xlator_cbks cbks = {
         .invalidate = fuse_invalidate,
+        .forget     = fuse_forget_cbk,
 };
 
 
@@ -5307,5 +5520,9 @@ struct volume_options options[] = {
         { .key = {"fuse-mountopts"},
           .type = GF_OPTION_TYPE_STR
         },
+        { .key = {"use-readdirp"},
+          .type = GF_OPTION_TYPE_BOOL,
+          .default_value = "yes"
+        },
         { .key = {NULL} },
 };
diff --git a/xlators/mount/fuse/src/fuse-bridge.h b/xlators/mount/fuse/src/fuse-bridge.h
index d90b85e72..34794b6ea 100644
--- a/xlators/mount/fuse/src/fuse-bridge.h
+++ b/xlators/mount/fuse/src/fuse-bridge.h
@@ -101,7 +101,7 @@ struct fuse_private {
         gf_boolean_t         acl;
         gf_boolean_t         selinux;
         gf_boolean_t         read_only;
-	gf_boolean_t	     fopen_keep_cache;
+	int32_t	             fopen_keep_cache;
 	int32_t		     gid_cache_timeout;
         gf_boolean_t         enable_ino32;
         fdtable_t           *fdtable;
@@ -119,6 +119,9 @@ struct fuse_private {
         /* for fuse queue length and congestion threshold */
         int background_qlen;
         int congestion_threshold;
+
+        /* for using fuse-kernel readdirp*/
+        gf_boolean_t use_readdirp;
 };
 typedef struct fuse_private fuse_private_t;
 
@@ -142,9 +145,10 @@ typedef struct fuse_graph_switch_args fuse_graph_switch_args_t;
 
 #define FUSE_FOP(state, ret, op_num, fop, args ...)                     \
         do {                                                            \
-                call_frame_t *frame  = NULL;                            \
-                xlator_t     *xl     = NULL;                            \
-                int32_t       op_ret = 0, op_errno = 0;                 \
+                call_frame_t   *frame   = NULL;                         \
+                xlator_t       *xl      = NULL;                         \
+                int32_t         op_ret  = 0, op_errno = 0;              \
+                fuse_resolve_t *resolve = NULL;                         \
                                                                         \
                 frame = get_call_frame_for_req (state);                 \
                 if (!frame) {                                           \
@@ -171,14 +175,20 @@ typedef struct fuse_graph_switch_args fuse_graph_switch_args_t;
                 frame->root->op    = op_num;                            \
                 frame->op          = op_num;                            \
                                                                         \
+                if ( state->resolve_now ) {                             \
+                        resolve = state->resolve_now;                   \
+                } else {                                                \
+                        resolve = &(state->resolve);                    \
+                }                                                       \
+                                                                        \
                 xl = state->active_subvol;				\
                 if (!xl) {                                              \
                         gf_log_callingfn ("glusterfs-fuse", GF_LOG_ERROR, \
                                           "xl is NULL");                \
                         op_errno = ENOENT;                              \
                         op_ret = -1;                                    \
-                } else if (state->resolve.op_ret < 0) {                 \
-                        op_errno = state->resolve.op_errno;             \
+                } else if (resolve->op_ret < 0) {                       \
+                        op_errno = resolve->op_errno;                   \
                         op_ret = -1;                                    \
                         if (op_num == GF_FOP_LOOKUP) {                  \
                                 gf_log ("glusterfs-fuse",               \
@@ -187,7 +197,7 @@ typedef struct fuse_graph_switch_args fuse_graph_switch_args_t;
                                         "%"PRIu64": %s() %s => -1 (%s)", \
                                         frame->root->unique,            \
                                         gf_fop_list[frame->root->op],   \
-                                        state->resolve.resolve_loc.path, \
+                                        resolve->resolve_loc.path,      \
                                         strerror (op_errno));           \
                         } else {                                        \
                                 gf_log ("glusterfs-fuse",               \
@@ -196,7 +206,7 @@ typedef struct fuse_graph_switch_args fuse_graph_switch_args_t;
                                         "migration of %s failed (%s)",  \
                                         frame->root->unique,            \
                                         gf_fop_list[frame->root->op],   \
-                                        state->resolve.resolve_loc.path, \
+                                        resolve->resolve_loc.path,      \
                                         strerror (op_errno));           \
                         }                                               \
                 } else if (state->resolve2.op_ret < 0) {                \
diff --git a/xlators/mount/fuse/src/fuse-helpers.c b/xlators/mount/fuse/src/fuse-helpers.c
index d4dcc2e61..4d478b919 100644
--- a/xlators/mount/fuse/src/fuse-helpers.c
+++ b/xlators/mount/fuse/src/fuse-helpers.c
@@ -7,6 +7,10 @@
    later), or the GNU General Public License, version 2 (GPLv2), in all
    cases as published by the Free Software Foundation.
 */
+#ifdef __NetBSD__
+#define _KMEMUSER
+#endif
+
 #include "fuse-bridge.h"
 #if defined(GF_SOLARIS_HOST_OS)
 #include <sys/procfs.h>
@@ -14,9 +18,6 @@
 #include <sys/sysctl.h>
 #endif
 
-#ifndef GF_REQUEST_MAXGROUPS
-#define GF_REQUEST_MAXGROUPS    16
-#endif /* GF_REQUEST_MAXGROUPS */
 
 static void
 fuse_resolve_wipe (fuse_resolve_t *resolve)
@@ -138,6 +139,7 @@ get_fuse_state (xlator_t *this, fuse_in_header_t *finh)
 }
 
 
+#define FUSE_MAX_AUX_GROUPS 32 /* We can get only up to 32 aux groups from /proc */
 void
 frame_fill_groups (call_frame_t *frame)
 {
@@ -160,6 +162,9 @@ frame_fill_groups (call_frame_t *frame)
         if (!fp)
                 goto out;
 
+	if (call_stack_alloc_groups (frame->root, FUSE_MAX_AUX_GROUPS) != 0)
+		goto out;
+
         while ((ptr = fgets (line, sizeof line, fp))) {
                 if (strncmp (ptr, "Groups:", 7) != 0)
                         continue;
@@ -176,7 +181,7 @@ frame_fill_groups (call_frame_t *frame)
                         if (!endptr || *endptr)
                                 break;
                         frame->root->groups[idx++] = id;
-                        if (idx == GF_MAX_AUX_GROUPS)
+                        if (idx == FUSE_MAX_AUX_GROUPS)
                                 break;
                 }
 
@@ -192,6 +197,7 @@ out:
         prcred_t    *prcred = (prcred_t *) scratch;
         FILE        *fp = NULL;
         int          ret = 0;
+	int          ngrps;
 
         ret = snprintf (filename, sizeof filename,
                         "/proc/%d/cred", frame->root->pid);
@@ -200,8 +206,11 @@ out:
                 fp = fopen (filename, "r");
                 if (fp != NULL) {
                         if (fgets (scratch, sizeof scratch, fp) != NULL) {
-                                frame->root->ngrps = MIN(prcred->pr_ngroups,
-                                                         GF_REQUEST_MAXGROUPS);
+                                ngrps = MIN(prcred->pr_ngroups,
+					    GF_MAX_AUX_GROUPS);
+				if (call_stack_alloc_groups (frame->root,
+							     ngrps) != 0)
+					return;
                         }
                         fclose (fp);
                  }
@@ -226,7 +235,9 @@ out:
 
         if (sysctl(name, namelen, &kp, &kplen, NULL, 0) != 0)
                 return;
-        ngroups = MIN(kp.kp_eproc.e_ucred.cr_ngroups, GF_REQUEST_MAXGROUPS);
+        ngroups = MIN(kp.kp_eproc.e_ucred.cr_ngroups, GF_MAX_AUX_GROUPS);
+	if (call_stack_alloc_groups (frame->root, ngroups) != 0)
+		return;
         for (i = 0; i < ngroups; i++)
                 frame->root->groups[i] = kp.kp_eproc.e_ucred.cr_groups[i];
         frame->root->ngrps = ngroups;
@@ -257,6 +268,8 @@ static void get_groups(fuse_private_t *priv, call_frame_t *frame)
 
 	gl = gid_cache_lookup(&priv->gid_cache, frame->root->pid);
 	if (gl) {
+		if (call_stack_alloc_groups (frame->root, gl->gl_count) != 0)
+			return;
 		frame->root->ngrps = gl->gl_count;
 		for (i = 0; i < gl->gl_count; i++)
 			frame->root->groups[i] = gl->gl_list[i];
diff --git a/xlators/mount/fuse/src/fuse-resolve.c b/xlators/mount/fuse/src/fuse-resolve.c
index 88ce32ab9..8565ce0e4 100644
--- a/xlators/mount/fuse/src/fuse-resolve.c
+++ b/xlators/mount/fuse/src/fuse-resolve.c
@@ -26,6 +26,8 @@ int fuse_migrate_fd (xlator_t *this, fd_t *fd, xlator_t *old_subvol,
 fuse_fd_ctx_t *
 fuse_fd_ctx_get (xlator_t *this, fd_t *fd);
 
+gf_boolean_t fuse_inode_needs_lookup (inode_t *inode, xlator_t *this);
+
 static int
 fuse_resolve_loc_touchup (fuse_state_t *state)
 {
@@ -201,7 +203,11 @@ fuse_resolve_gfid (fuse_state_t *state)
                 uuid_copy (resolve_loc->gfid, resolve->gfid);
         }
 
-	resolve_loc->inode = inode_new (state->itable);
+	/* inode may already exist in case we are looking up an inode which was
+	   linked through readdirplus */
+	resolve_loc->inode = inode_find (state->itable, resolve_loc->gfid);
+	if (!resolve_loc->inode)
+		resolve_loc->inode = inode_new (state->itable);
 	ret = loc_path (resolve_loc, NULL);
 
         if (ret <= 0) {
@@ -239,6 +245,9 @@ fuse_resolve_parent_simple (fuse_state_t *state)
 
 	parent = resolve->parhint;
 	if (parent->table == state->itable) {
+		if (fuse_inode_needs_lookup (parent, THIS))
+			return 1;
+
 		/* no graph switches since */
 		loc->parent = inode_ref (parent);
 		uuid_copy (loc->pargfid, parent->gfid);
@@ -265,6 +274,10 @@ fuse_resolve_parent_simple (fuse_state_t *state)
 		/* non decisive result - parent missing */
 		return 1;
 	}
+	if (fuse_inode_needs_lookup (parent, THIS)) {
+		inode_unref (parent);
+		return 1;
+	}
 
 	loc->parent = parent;
         uuid_copy (loc->pargfid, resolve->pargfid);
@@ -314,15 +327,18 @@ fuse_resolve_inode_simple (fuse_state_t *state)
 	loc = state->loc_now;
 
 	inode = resolve->hint;
-	if (inode->table == state->itable) {
+	if (inode->table == state->itable)
 		inode_ref (inode);
-		goto found;
+	else
+		inode = inode_find (state->itable, resolve->gfid);
+
+        if (inode) {
+		if (!fuse_inode_needs_lookup (inode, THIS))
+			goto found;
+		/* inode was linked through readdirplus */
+		inode_unref (inode);
 	}
 
-        inode = inode_find (state->itable, resolve->gfid);
-        if (inode)
-		goto found;
-
         return 1;
 found:
 	loc->inode = inode;
diff --git a/xlators/mount/fuse/utils/mount.glusterfs.in b/xlators/mount/fuse/utils/mount.glusterfs.in
index 8fcd0d32b..a192d6059 100755
--- a/xlators/mount/fuse/utils/mount.glusterfs.in
+++ b/xlators/mount/fuse/utils/mount.glusterfs.in
@@ -27,6 +27,8 @@ _init ()
     LOG_DEBUG=DEBUG;
     LOG_TRACE=TRACE;
 
+    HOST_NAME_MAX=64;
+
     prefix="@prefix@";
     exec_prefix=@exec_prefix@;
     cmd_line=$(echo "@sbindir@/glusterfs");
@@ -51,8 +53,24 @@ _init ()
     esac
 
     UPDATEDBCONF=/etc/updatedb.conf
-    LD_LIBRARY_PATH=@libdir@:${LD_LIBRARY_PATH}
-    export LD_LIBRARY_PATH
+}
+
+parse_backup_volfile_servers ()
+{
+    local server_list=$1
+    local servers=""
+    local new_servers=""
+
+    servers=$(echo ${server_list} | sed 's/\:/ /g')
+    for server in ${servers}; do
+        length=$(echo $server | wc -c)
+        if [ ${length} -gt ${HOST_NAME_MAX} ]; then
+            echo "Hostname:${server} provided is too long.. skipping"
+            continue
+        fi
+        new_servers=$(echo "$new_servers $server")
+    done
+    echo ${new_servers}
 }
 
 start_glusterfs ()
@@ -60,46 +78,46 @@ start_glusterfs ()
     # lets the comparsion be case insensitive for all strings
 
     if [ -n "$log_level_str" ]; then
-	case "$( echo $log_level_str | tr '[a-z]' '[A-Z]')" in
-	    "ERROR")
-		log_level=$LOG_ERROR;
-		;;
+        case "$( echo $log_level_str | tr '[a-z]' '[A-Z]')" in
+            "ERROR")
+                log_level=$LOG_ERROR;
+                ;;
             "INFO")
                 log_level=$LOG_INFO
                 ;;
-	    "DEBUG")
-		log_level=$LOG_DEBUG;
-		;;
-	    "CRITICAL")
-		log_level=$LOG_CRITICAL;
-		;;
-	    "WARNING")
-		log_level=$LOG_WARNING;
-		;;
-	    "TRACE")
-		log_level=$LOG_TRACE;
-		;;
-	    "NONE")
-		log_level=$LOG_NONE;
-		;;
-	    *)
-		echo "invalid log level $log_level_str, using INFO";
-		log_level=$LOG_INFO;
-		;;
-	esac
+            "DEBUG")
+                log_level=$LOG_DEBUG;
+                ;;
+            "CRITICAL")
+                log_level=$LOG_CRITICAL;
+                ;;
+            "WARNING")
+                log_level=$LOG_WARNING;
+                ;;
+            "TRACE")
+                log_level=$LOG_TRACE;
+                ;;
+            "NONE")
+                log_level=$LOG_NONE;
+                ;;
+            *)
+                echo "invalid log level $log_level_str, using INFO";
+                log_level=$LOG_INFO;
+                ;;
+        esac
     fi
 
 #options without values start here
     if [ -n "$read_only" ]; then
-	cmd_line=$(echo "$cmd_line --read-only");
+        cmd_line=$(echo "$cmd_line --read-only");
     fi
 
     if [ -n "$acl" ]; then
-	cmd_line=$(echo "$cmd_line --acl");
+        cmd_line=$(echo "$cmd_line --acl");
     fi
 
     if [ -n "$selinux" ]; then
-	cmd_line=$(echo "$cmd_line --selinux");
+        cmd_line=$(echo "$cmd_line --selinux");
     fi
 
     if [ -n "$enable_ino32" ]; then
@@ -111,28 +129,36 @@ start_glusterfs ()
     fi
 
     if [ -n "$fopen_keep_cache" ]; then
-	cmd_line=$(echo "$cmd_line --fopen-keep-cache");
+        cmd_line=$(echo "$cmd_line --fopen-keep-cache");
     fi
 
     if [ -n "$volfile_check" ]; then
-	cmd_line=$(echo "$cmd_line --volfile-check");
+        cmd_line=$(echo "$cmd_line --volfile-check");
     fi
 
     if [ -n "$mem_accounting" ]; then
         cmd_line=$(echo "$cmd_line --mem-accounting");
     fi
 
+    if [ -n "$aux_gfid_mount" ]; then
+        cmd_line=$(echo "$cmd_line --aux-gfid-mount");
+    fi
+
 #options with values start here
     if [ -n "$log_level" ]; then
         cmd_line=$(echo "$cmd_line --log-level=$log_level");
     fi
 
     if [ -n "$log_file" ]; then
-	cmd_line=$(echo "$cmd_line --log-file=$log_file");
+        cmd_line=$(echo "$cmd_line --log-file=$log_file");
     fi
 
     if [ -n "$direct_io_mode" ]; then
-	cmd_line=$(echo "$cmd_line --direct-io-mode=$direct_io_mode");
+        cmd_line=$(echo "$cmd_line --direct-io-mode=$direct_io_mode");
+    fi
+
+    if [ -n "$use_readdirp" ]; then
+        cmd_line=$(echo "$cmd_line --use-readdirp=$use_readdirp");
     fi
 
     if [ -n "$volume_name" ]; then
@@ -152,19 +178,24 @@ start_glusterfs ()
     fi
 
     if [ -n "$gid_timeout" ]; then
-	cmd_line=$(echo "$cmd_line --gid-timeout=$gid_timeout");
+        cmd_line=$(echo "$cmd_line --gid-timeout=$gid_timeout");
     fi
 
     if [ -n "$bg_qlen" ]; then
-	cmd_line=$(echo "$cmd_line --background-qlen=$bg_qlen");
+        cmd_line=$(echo "$cmd_line --background-qlen=$bg_qlen");
     fi
 
     if [ -n "$cong_threshold" ]; then
-	cmd_line=$(echo "$cmd_line --congestion-threshold=$cong_threshold");
+        cmd_line=$(echo "$cmd_line --congestion-threshold=$cong_threshold");
     fi
 
     if [ -n "$fuse_mountopts" ]; then
-	cmd_line=$(echo "$cmd_line --fuse-mountopts=$fuse_mountopts");
+        cmd_line=$(echo "$cmd_line --fuse-mountopts=$fuse_mountopts");
+    fi
+
+    if [ -n "$xlator_option" ]; then
+        xlator_option=$(echo $xlator_option | sed s/"xlator-option="/"--xlator-option "/g)
+        cmd_line=$(echo "$cmd_line $xlator_option");
     fi
 
     # for rdma volume, we have to fetch volfile with '.rdma' added
@@ -173,36 +204,40 @@ start_glusterfs ()
 
     if [ -z "$volfile_loc" ]; then
         if  [ -n "$server_ip" ]; then
+
+            cmd_line=$(echo "$cmd_line --volfile-server=$server_ip");
+
+            if [ -n "$backup_volfile_servers" ]; then
+                servers=$(parse_backup_volfile_servers ${backup_volfile_servers})
+                for i in $(echo ${servers}); do
+                    cmd_line=$(echo "$cmd_line --volfile-server=$i");
+                done
+            fi
+
             if [ -n "$server_port" ]; then
                 cmd_line=$(echo "$cmd_line --volfile-server-port=$server_port");
             fi
-	    if [ -n "$transport" ]; then
+
+            if [ -n "$transport" ]; then
                 cmd_line=$(echo "$cmd_line --volfile-server-transport=$transport");
                 if [ "$transport" = "rdma" ]; then
                     volume_id_rdma=".rdma";
                 fi
             fi
+
             if [ -n "$volume_id" ]; then
                 if [ -n "$volume_id_rdma" ]; then
                     volume_id="$volume_id$volume_id_rdma";
                 fi
                 cmd_line=$(echo "$cmd_line --volfile-id=$volume_id");
             fi
-
-            if [ -n "$backupvolfile_server" ]; then
-                cmd_line1=$(echo "$cmd_line --volfile-server=$backupvolfile_server");
-            fi
-            if [ -n "$volfile_max_fetch_attempts" ]; then
-                cmd_line=$(echo "$cmd_line --volfile-max-fetch-attempts=$volfile_max_fetch_attempts");
-            fi
-	    cmd_line=$(echo "$cmd_line --volfile-server=$server_ip");
         fi
     else
         cmd_line=$(echo "$cmd_line --volfile=$volfile_loc");
     fi
 
     if [ -n "$fuse_mountopts" ]; then
-	cmd_line=$(echo "$cmd_line --fuse-mountopts=$fuse_mountopts");
+        cmd_line=$(echo "$cmd_line --fuse-mountopts=$fuse_mountopts");
     fi
 
     cmd_line=$(echo "$cmd_line $mount_point");
@@ -217,24 +252,8 @@ start_glusterfs ()
         inode="0";
     fi
 
-    # retry the failover
-    # if [ $? != "0" ]; then # <--- TODO: Once glusterfs returns proper error code, change it.
     if [ $inode -ne 1 ]; then
         err=1;
-        if [ -n "$cmd_line1" ]; then
-            cmd_line1=$(echo "$cmd_line1 $mount_point");
-            $cmd_line1;
-            err=0;
-
-            inode=$( ${getinode} $mount_point 2>/dev/null);
-            # this is required if the stat returns error
-            if [ -z "$inode" ]; then
-                inode="0";
-            fi
-            if [ $inode -ne 1 ]; then
-                err=1;
-            fi
-        fi
     fi
 
     if [ $err -eq "1" ]; then
@@ -259,13 +278,13 @@ mount.glusterfs --version"
 # check for recursive mounts. i.e, mounting over an existing brick
 check_recursive_mount ()
 {
-    if [ $2 = "/" ]; then
+    if [ $1 = "/" ]; then
         echo Cannot mount over root;
         exit 2;
     fi
     # GFID check first
     # remove trailing / from mount point
-    mnt_dir=${2%/};
+    mnt_dir=${1%/};
 
     export PATH;
     # check whether getfattr exists
@@ -324,7 +343,6 @@ check_recursive_mount ()
 main ()
 {
     helper=$(echo "$@" | sed -n 's/.*\--[ ]*\([^ ]*\).*/\1/p');
-
     in_opt="no"
     pos_args=0
     for opt in "$@"; do
@@ -336,9 +354,14 @@ main ()
                     "acl")              acl=1 ;;
                     "selinux")          selinux=1 ;;
                     "worm")             worm=1 ;;
-		    "fopen-keep-cache")	fopen_keep_cache=1 ;;
+                    "fopen-keep-cache") fopen_keep_cache=1 ;;
                     "enable-ino32")     enable_ino32=1 ;;
                     "mem-accounting")   mem_accounting=1;;
+                    "aux-gfid-mount")
+                        if [ `uname -s` = "Linux" ]; then
+                            aux_gfid_mount=1
+                        fi
+                        ;;
                     # "mount -t glusterfs" sends this, but it's useless.
                     "rw")       ;;
                     # these ones are interpreted during system initialization
@@ -358,18 +381,17 @@ main ()
                             "volume-id")        volume_id=$value ;;
                             "volfile-check")    volfile_check=$value ;;
                             "server-port")      server_port=$value ;;
-                            "fetch-attempts")
-                                volfile_max_fetch_attempts=$value ;;
-                            "backupvolfile-server")
-                                backupvolfile_server=$value ;;
                             "attribute-timeout")
                                 attribute_timeout=$value ;;
                             "entry-timeout")    entry_timeout=$value ;;
                             "negative-timeout")    negative_timeout=$value ;;
-			    "gid-timeout")	gid_timeout=$value ;;
-			    "background-qlen")	bg_qlen=$value ;;
-			    "congestion-threshold")	cong_threshold=$value ;;
-			    "fuse-mountopts")	fuse_mountopts=$value ;;
+                            "gid-timeout")   gid_timeout=$value ;;
+                            "background-qlen") bg_qlen=$value ;;
+                            "backup-volfile-servers") backup_volfile_servers=$value ;;
+                            "congestion-threshold")  cong_threshold=$value ;;
+                            "xlator-option")  xlator_option=$xlator_option" "$pair ;;
+                            "fuse-mountopts")  fuse_mountopts=$value ;;
+                            "use-readdirp") use_readdirp=$value ;;
                             *)
                                 # Passthru
                                 [ -z "$fuse_mountopts" ] || fuse_mountopts="$fuse_mountopts,"
@@ -401,7 +423,7 @@ main ()
         [ -n "$test_str" ] && {
             volume_id="$test_str";
         }
-	volfile_loc="";
+        volfile_loc="";
     }
 
     #
@@ -426,7 +448,7 @@ main ()
         exit 0;
     fi
 
-    check_recursive_mount "$@";
+    check_recursive_mount "$mount_point";
 
     # Append fuse.glusterfs to PRUNEFS variable in updatedb.conf(5). updatedb(8)
     # should not index files under GlusterFS, indexing will slow down GlusteFS
diff --git a/xlators/nfs/server/src/Makefile.am b/xlators/nfs/server/src/Makefile.am
index 2795a935d..62fbf6535 100644
--- a/xlators/nfs/server/src/Makefile.am
+++ b/xlators/nfs/server/src/Makefile.am
@@ -14,7 +14,7 @@ noinst_HEADERS = nfs.h nfs-common.h nfs-fops.h nfs-inodes.h nfs-generics.h \
 AM_CPPFLAGS = $(GF_CPPFLAGS) \
 	-DLIBDIR=\"$(libdir)/glusterfs/$(PACKAGE_VERSION)/auth\" \
 	-I$(top_srcdir)/libglusterfs/src \
-	-I$(nfsrpclibdir) -I$(CONTRIBDIR)/rbtree\
+	-I$(nfsrpclibdir) -I$(CONTRIBDIR)/rbtree \
 	-I$(top_srcdir)/rpc/xdr/src/
 
 AM_CFLAGS = -Wall $(GF_CFLAGS)
diff --git a/xlators/nfs/server/src/acl3.c b/xlators/nfs/server/src/acl3.c
index ed60775ab..08b099b4e 100644
--- a/xlators/nfs/server/src/acl3.c
+++ b/xlators/nfs/server/src/acl3.c
@@ -113,8 +113,10 @@ nfs3_fh_to_xlator (struct nfs3_state *nfs3, struct nfs3_fh *fh);
                         xlatorp = nfs3_fh_to_xlator (cst->nfs3state,    \
                                                      &cst->resolvefh);  \
                         uuid_unparse (cst->resolvefh.gfid, gfid);       \
-                        sprintf (buf, "(%s) %s : %s", trans->peerinfo.identifier,\
-                        xlatorp ? xlatorp->name : "ERR", gfid);         \
+                        snprintf (buf, sizeof (buf), "(%s) %s : %s",             \
+                                  trans->peerinfo.identifier,           \
+                                  xlatorp ? xlatorp->name : "ERR",      \
+                                  gfid);                                \
                         gf_log (GF_ACL, GF_LOG_ERROR, "Unable to resolve FH"\
                                 ": %s", buf);                           \
                         nfstat = nfs3_errno_to_nfsstat3 (cst->resolve_errno);\
@@ -138,10 +140,11 @@ nfs3_fh_to_xlator (struct nfs3_state *nfs3, struct nfs3_fh *fh);
 int
 acl3svc_submit_reply (rpcsvc_request_t *req, void *arg, acl3_serializer sfunc)
 {
-        struct iovec            outmsg = {0, };
-        struct iobuf            *iob = NULL;
-        struct nfs3_state       *nfs3 = NULL;
-        int                     ret = -1;
+        struct iovec            outmsg  = {0, };
+        struct iobuf            *iob    = NULL;
+        struct nfs3_state       *nfs3   = NULL;
+        int                     ret     = -1;
+        ssize_t                 msglen  = 0;
         struct iobref           *iobref = NULL;
 
         if (!req)
@@ -166,7 +169,12 @@ acl3svc_submit_reply (rpcsvc_request_t *req, void *arg, acl3_serializer sfunc)
         /* Use the given serializer to translate the give C structure in arg
          * to XDR format which will be written into the buffer in outmsg.
          */
-        outmsg.iov_len = sfunc (outmsg, arg);
+        msglen = sfunc (outmsg, arg);
+        if (msglen < 0) {
+                gf_log (GF_ACL, GF_LOG_ERROR, "Failed to encode message");
+                goto ret;
+        }
+        outmsg.iov_len = msglen;
 
         iobref = iobref_new ();
         if (iobref == NULL) {
@@ -174,7 +182,11 @@ acl3svc_submit_reply (rpcsvc_request_t *req, void *arg, acl3_serializer sfunc)
                 goto ret;
         }
 
-        iobref_add (iobref, iob);
+        ret = iobref_add (iobref, iob);
+        if (ret) {
+                gf_log (GF_ACL, GF_LOG_ERROR, "Failed to add iob to iobref");
+                goto ret;
+        }
 
         /* Then, submit the message for transmission. */
         ret = rpcsvc_submit_message (req, &outmsg, 1, NULL, 0, iobref);
@@ -228,12 +240,15 @@ acl3_getacl_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
         int                             i = 0;
         getaclreply                     *getaclreply = NULL;
 
+        if (!frame->local) {
+                gf_log (GF_ACL, GF_LOG_ERROR, "Invalid argument,"
+                       " frame->local NULL");
+                return  EINVAL;
+        }
         cs = frame->local;
-        if (cs)
-                getaclreply = &cs->args.getaclreply;
-
+        getaclreply = &cs->args.getaclreply;
         if (op_ret == -1) {
-                stat = nfs3_errno_to_nfsstat3 (op_errno);
+                stat = nfs3_cbk_errno_status (op_ret, op_errno);
                 goto err;
         }
 
@@ -241,9 +256,9 @@ acl3_getacl_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
         getaclreply->daclentry.daclentry_val = cs->daclentry;
 
         /* FIXME: use posix_acl_from_xattr() */
-        data = dict_get (dict, "system.posix_acl_access");
+        data = dict_get (dict, POSIX_ACL_ACCESS_XATTR);
         if (data && (p = data_to_bin (data))) {
-                /* POSIX_ACL_XATTR_VERSION */
+                /* POSIX_ACL_VERSION */
                 p++;
                 while ((char *)p < (data->data + data->len)) {
                         getaclreply->aclentry.aclentry_val[i].type = *(*(short **)&p)++;
@@ -255,9 +270,9 @@ acl3_getacl_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
         }
         i = 0;
 
-        data = dict_get (dict, "system.posix_acl_default");
+        data = dict_get (dict, POSIX_ACL_DEFAULT_XATTR);
         if (data && (p = data_to_bin (data))) {
-                /* POSIX_ACL_XATTR_VERSION */
+                /* POSIX_ACL_VERSION */
                 p++;
                 while ((char *)p < (data->data + data->len)) {
                         getaclreply->daclentry.daclentry_val[i].type = *(*(short **)&p)++;
@@ -291,12 +306,17 @@ acl3_stat_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
         int                             ret = -1;
         nfs_user_t                      nfu = {0, };
 
+        if (!frame->local) {
+                gf_log (GF_ACL, GF_LOG_ERROR, "Invalid argument,"
+                       " frame->local NULL");
+                return EINVAL;
+        }
+
         cs = frame->local;
-        if (cs)
-                getaclreply = &cs->args.getaclreply;
+        getaclreply = &cs->args.getaclreply;
 
         if (op_ret == -1) {
-                stat = nfs3_errno_to_nfsstat3 (op_errno);
+                stat = nfs3_cbk_errno_status (op_ret, op_errno);
                 goto err;
         }
 
@@ -307,7 +327,7 @@ acl3_stat_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
         ret = nfs_getxattr (cs->nfsx, cs->vol, &nfu, &cs->resolvedloc, NULL, NULL,
                             acl3_getacl_cbk, cs);
         if (ret == -1) {
-                stat = nfs3_errno_to_nfsstat3 (op_errno);
+                stat = nfs3_cbk_errno_status (op_ret, op_errno);
                 goto err;
         }
         return 0;
@@ -409,7 +429,8 @@ acl3_setacl_cbk (call_frame_t *frame, void *cookie,
         nfs3_call_state_t               *cs = NULL;
         cs = frame->local;
         if (op_ret < 0) {
-                cs->args.setaclreply.status = nfs3_errno_to_nfsstat3 (op_errno);
+                nfsstat3 status = nfs3_cbk_errno_status (op_ret, op_errno);
+                cs->args.setaclreply.status = status;
         }
 
         acl3svc_submit_reply (cs->req, (void *)&cs->args.setaclreply,
@@ -428,17 +449,16 @@ acl3_setacl_resume (void *carg)
 
         if (!carg)
                 return ret;
-
         cs = (nfs3_call_state_t *)carg;
         acl3_check_fh_resolve_status (cs, stat, acl3err);
         nfs_request_user_init (&nfu, cs->req);
         xattr = dict_new();
         if (cs->aclcount)
-        ret = dict_set_static_bin (xattr, "system.posix_acl_access", cs->aclxattr,
+        ret = dict_set_static_bin (xattr, POSIX_ACL_ACCESS_XATTR, cs->aclxattr,
                                    cs->aclcount * 8 + 4);
         if (cs->daclcount)
-        ret = dict_set_static_bin (xattr, "system.posix_acl_default", cs->daclxattr,
-                                   cs->daclcount * 8 + 4);
+        ret = dict_set_static_bin (xattr, POSIX_ACL_DEFAULT_XATTR,
+                                   cs->daclxattr, cs->daclcount * 8 + 4);
 
         ret = nfs_setxattr (cs->nfsx, cs->vol, &nfu, &cs->resolvedloc, xattr,
                             0, NULL, acl3_setacl_cbk, cs);
@@ -470,12 +490,24 @@ acl3svc_setacl (rpcsvc_request_t *req)
         struct nfs3_fh                  fh;
         struct nfs3_fh                 *fhp = NULL;
         setaclargs                      setaclargs;
-        aclentry                        aclentry[NFS_ACL_MAX_ENTRIES];
-        struct aclentry                 daclentry[NFS_ACL_MAX_ENTRIES];
-        int                             *p = NULL, i = 0;
+        aclentry                        *aclentry = NULL;
+        struct aclentry                 *daclentry = NULL;
+        int                             i = 0;
+        struct posix_acl_xattr_header   *bufheader = NULL;
+        struct posix_acl_xattr_entry    *bufentry  = NULL;
 
         if (!req)
                 return ret;
+        aclentry =  GF_CALLOC (NFS_ACL_MAX_ENTRIES, sizeof(*aclentry),
+                               gf_nfs_mt_arr);
+        if (!aclentry) {
+                goto rpcerr;
+        }
+        daclentry = GF_CALLOC (NFS_ACL_MAX_ENTRIES, sizeof(*daclentry),
+                               gf_nfs_mt_arr);
+        if (!daclentry) {
+                goto rpcerr;
+        }
 
         acl3_validate_nfs3_state (req, nfs3, stat, rpcerr, ret);
         nfs = nfs_state (nfs3->nfsx);
@@ -506,19 +538,58 @@ acl3svc_setacl (rpcsvc_request_t *req)
                         (cs->daclcount > NFS_ACL_MAX_ENTRIES))
                 goto acl3err;
         /* FIXME: use posix_acl_to_xattr() */
-        p = (int *)cs->aclxattr;
-        *(*(int **)&p)++ = POSIX_ACL_XATTR_VERSION;
+        /* Populate xattr buffer for user ACL */
+        bufheader = (struct posix_acl_xattr_header *)(cs->aclxattr);
+        bufheader->version = htole32(POSIX_ACL_VERSION);
+        bufentry  = bufheader->entries;
         for (i = 0; i < cs->aclcount; i++) {
-                *(*(short **)&p)++ = aclentry[i].type;
-                *(*(short **)&p)++ = aclentry[i].perm;
-                *(*(int **)&p)++ = aclentry[i].uid;
+                int uaceuid;
+                const struct aclentry *uace = &aclentry[i];
+                switch (uace->type) {
+                    case POSIX_ACL_USER:
+                    case POSIX_ACL_GROUP:
+                        uaceuid = uace->uid;
+                        break;
+                    default:
+                        uaceuid = POSIX_ACL_UNDEFINED_ID;
+                        break;
+                }
+                bufentry->tag  = htole16(uace->type);
+                bufentry->perm = htole16(uace->perm);
+                bufentry->id   = htole32(uaceuid);
+
+                bufentry++;
         }
-        p = (int *)cs->daclxattr;
-        *(*(int **)&p)++ = POSIX_ACL_XATTR_VERSION;
+
+        /* Populate xattr buffer for Default ACL */
+        bufheader = (struct posix_acl_xattr_header *)(cs->aclxattr);
+        bufheader->version = htole32(POSIX_ACL_VERSION);
+        bufentry  = bufheader->entries;
         for (i = 0; i < cs->daclcount; i++) {
-                *(*(short **)&p)++ = daclentry[i].type;
-                *(*(short **)&p)++ = daclentry[i].perm;
-                *(*(int **)&p)++ = daclentry[i].uid;
+                int daceuid;
+                int dacetype;
+                const struct aclentry *dace = &daclentry[i];
+                /*
+                 * For "default ACL", NFSv3 handles the 'type' differently
+                 * i.e. by logical OR'ing 'type' with NFS_ACL_DEFAULT.
+                 * Which the backend File system does not understand and
+                 * that needs to be masked OFF.
+                 */
+                dacetype = (dace->type & ~(NFS_ACL_DEFAULT));
+                switch (dacetype) {
+                    case POSIX_ACL_USER:
+                    case POSIX_ACL_GROUP:
+                        daceuid = dace->uid;
+                        break;
+                    default:
+                        daceuid = POSIX_ACL_UNDEFINED_ID;
+                        break;
+                }
+                bufentry->tag  = htole16(dacetype);
+                bufentry->perm = htole16(dace->perm);
+                bufentry->id   = htole32(daceuid);
+
+                bufentry++;
         }
 
 
@@ -532,19 +603,23 @@ acl3err:
                 acl3svc_submit_reply (cs->req, (void *)&cs->args.setaclreply,
                                       (acl3_serializer)xdr_serialize_setaclreply);
                 nfs3_call_state_wipe (cs);
+                GF_FREE(aclentry);
+                GF_FREE(daclentry);
                 return 0;
         }
 
 rpcerr:
         if (ret < 0)
                 nfs3_call_state_wipe (cs);
-
+        if (aclentry)
+                GF_FREE (aclentry);
+        if (daclentry)
+                GF_FREE (daclentry);
         return ret;
 }
 
 
 
-
 rpcsvc_actor_t  acl3svc_actors[ACL3_PROC_COUNT] = {
         {"NULL",       ACL3_NULL,      acl3svc_null,   NULL,   0},
         {"GETACL",     ACL3_GETACL,    acl3svc_getacl, NULL,   0},
@@ -554,7 +629,7 @@ rpcsvc_actor_t  acl3svc_actors[ACL3_PROC_COUNT] = {
 rpcsvc_program_t        acl3prog = {
         .progname       = "ACL3",
         .prognum        = ACL_PROGRAM,
-        .progver        = ACL_V3,
+        .progver        = ACLV3_VERSION,
         .progport       = GF_NFS3_PORT,
         .actors         = acl3svc_actors,
         .numactors      = ACL3_PROC_COUNT,
@@ -569,6 +644,11 @@ acl3svc_init(xlator_t *nfsx)
         dict_t *options = NULL;
         int ret = -1;
         char *portstr = NULL;
+        static gf_boolean_t acl3_inited = _gf_false;
+
+        /* Already inited */
+        if (acl3_inited)
+                return &acl3prog;
 
         nfs = (struct nfs_state*)nfsx->private;
 
@@ -614,13 +694,14 @@ acl3svc_init(xlator_t *nfsx)
                 goto err;
         }
 
-        rpcsvc_create_listeners (nfs->rpcsvc, options, "ACL");
+        ret = rpcsvc_create_listeners (nfs->rpcsvc, options, "ACL");
         if (ret == -1) {
                 gf_log (GF_ACL, GF_LOG_ERROR, "Unable to create listeners");
                 dict_unref (options);
                 goto err;
         }
 
+        acl3_inited = _gf_true;
         return &acl3prog;
 err:
         return NULL;
diff --git a/xlators/nfs/server/src/acl3.h b/xlators/nfs/server/src/acl3.h
index b668723c8..e0e61281a 100644
--- a/xlators/nfs/server/src/acl3.h
+++ b/xlators/nfs/server/src/acl3.h
@@ -11,18 +11,19 @@
 #ifndef _ACL3_H
 #define _ACL3_H
 
+#include "glusterfs-acl.h"
+
 #define GF_ACL3_PORT            38469
 #define GF_ACL                  GF_NFS"-ACL"
 
-#define ACL_PROGRAM 100227
-#define ACL_V3 3
-
-#define ACL_USER_OBJ 0x1
-#define ACL_GROUP_OBJ 0x4
-#define ACL_OTHER_OBJ 0x20
+/*
+ * NFSv3, identifies the default ACL by NFS_ACL_DEFAULT. Gluster
+ * NFS needs to mask it OFF before sending it upto POSIX layer
+ * or File system layer.
+ */
+#define NFS_ACL_DEFAULT             0x1000
 
-#define POSIX_ACL_XATTR_VERSION 0x0002
-#define NFS_ACL_MAX_ENTRIES     1024
+#define NFS_ACL_MAX_ENTRIES         1024
 
 rpcsvc_program_t *
 acl3svc_init(xlator_t *nfsx);
diff --git a/xlators/nfs/server/src/mount3.c b/xlators/nfs/server/src/mount3.c
index 255310fa8..b0824bf10 100644
--- a/xlators/nfs/server/src/mount3.c
+++ b/xlators/nfs/server/src/mount3.c
@@ -2,19 +2,10 @@
   Copyright (c) 2010-2011 Gluster, Inc. <http://www.gluster.com>
   This file is part of GlusterFS.
 
-  GlusterFS is free software; you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published
-  by the Free Software Foundation; either version 3 of the License,
-  or (at your option) any later version.
-
-  GlusterFS is distributed in the hope that it will be useful, but
-  WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-  General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see
-  <http://www.gnu.org/licenses/>.
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
 */
 
 #ifndef _CONFIG_H
@@ -39,26 +30,71 @@
 #include "nfs-mem-types.h"
 #include "nfs.h"
 #include "common-utils.h"
-
+#include "store.h"
 
 #include <errno.h>
 #include <sys/socket.h>
 #include <sys/uio.h>
 
+
+#define IPv4_ADDR_SIZE  32
+
+/* Macro to typecast the parameter to struct sockaddr_in
+ */
+#define SA(addr) ((struct sockaddr_in*)(addr))
+
+/* Macro will mask the ip address with netmask.
+ */
+#define MASKED_IP(ipv4addr, netmask)                    \
+                (ntohl(SA(ipv4addr)->sin_addr.s_addr) & (netmask))
+
+/* Macro will compare two IP address after applying the mask
+ */
+#define COMPARE_IPv4_ADDRS(ip1, ip2, netmask)           \
+                ((MASKED_IP(ip1, netmask)) == (MASKED_IP(ip2, netmask)))
+
+/* This macro will assist in freeing up entire link list
+ * of host_auth_spec structure.
+ */
+#define FREE_HOSTSPEC(exp) do {                                 \
+                struct host_auth_spec *host= exp->hostspec;     \
+                while (NULL != host){                           \
+                        struct host_auth_spec* temp = host;     \
+                        host = host->next;                      \
+                        if (NULL != temp->host_addr) {          \
+                                GF_FREE (temp->host_addr);      \
+                        }                                       \
+                        GF_FREE (temp);                         \
+                }                                               \
+                exp->hostspec = NULL;                           \
+        } while (0)
+
 typedef ssize_t (*mnt3_serializer) (struct iovec outmsg, void *args);
 
 extern void *
 mount3udp_thread (void *argv);
 
+static inline void
+mnt3_export_free (struct mnt3_export *exp)
+{
+        if (!exp)
+                return;
+
+        if (exp->exptype == MNT3_EXPTYPE_DIR)
+                FREE_HOSTSPEC (exp);
+        GF_FREE (exp->expname);
+        GF_FREE (exp);
+}
 
 /* Generic reply function for MOUNTv3 specific replies. */
 int
 mnt3svc_submit_reply (rpcsvc_request_t *req, void *arg, mnt3_serializer sfunc)
 {
-        struct iovec            outmsg = {0, };
-        struct iobuf            *iob = NULL;
-        struct mount3_state     *ms = NULL;
-        int                     ret = -1;
+        struct iovec            outmsg  = {0, };
+        struct iobuf            *iob    = NULL;
+        struct mount3_state     *ms     = NULL;
+        int                     ret     = -1;
+        ssize_t                 msglen  = 0;
         struct iobref           *iobref = NULL;
 
         if (!req)
@@ -84,7 +120,12 @@ mnt3svc_submit_reply (rpcsvc_request_t *req, void *arg, mnt3_serializer sfunc)
         /* Use the given serializer to translate the give C structure in arg
          * to XDR format which will be written into the buffer in outmsg.
          */
-        outmsg.iov_len = sfunc (outmsg, arg);
+        msglen = sfunc (outmsg, arg);
+        if (msglen < 0) {
+                gf_log (GF_MNT, GF_LOG_ERROR, "Failed to encode message");
+                goto ret;
+        }
+        outmsg.iov_len = msglen;
 
         iobref = iobref_new ();
         if (iobref == NULL) {
@@ -92,12 +133,14 @@ mnt3svc_submit_reply (rpcsvc_request_t *req, void *arg, mnt3_serializer sfunc)
                 goto ret;
         }
 
-        iobref_add (iobref, iob);
+        ret = iobref_add (iobref, iob);
+        if (ret) {
+                gf_log (GF_MNT, GF_LOG_ERROR, "Failed to add iob to iobref");
+                goto ret;
+        }
 
         /* Then, submit the message for transmission. */
         ret = rpcsvc_submit_message (req, &outmsg, 1, NULL, 0, iobref);
-        iobuf_unref (iob);
-        iobref_unref (iobref);
         if (ret == -1) {
                 gf_log (GF_MNT, GF_LOG_ERROR, "Reply submission failed");
                 goto ret;
@@ -105,6 +148,11 @@ mnt3svc_submit_reply (rpcsvc_request_t *req, void *arg, mnt3_serializer sfunc)
 
         ret = 0;
 ret:
+        if (NULL != iob)
+                iobuf_unref (iob);
+        if (NULL != iobref)
+                iobref_unref (iobref);
+
         return ret;
 }
 
@@ -188,14 +236,278 @@ mnt3svc_set_mountres3 (mountstat3 stat, struct nfs3_fh *fh, int *authflavor,
         return res;
 }
 
+/* Read the rmtab from the store_handle and append (or not) the entries to the
+ * mountlist.
+ *
+ * Requires the store_handle to be locked.
+ */
+static int
+__mount_read_rmtab (gf_store_handle_t *sh, struct list_head *mountlist,
+                    gf_boolean_t append)
+{
+        int                     ret = 0;
+        unsigned int            idx = 0;
+        struct mountentry       *me = NULL, *tmp = NULL;
+                                /* me->hostname is a char[MNTPATHLEN] */
+        char                    key[MNTPATHLEN + 11];
+
+        GF_ASSERT (sh && mountlist);
+
+        if (!gf_store_locked_local (sh)) {
+                gf_log (GF_MNT, GF_LOG_WARNING, "Not reading unlocked %s",
+                        sh->path);
+                return -1;
+        }
+
+        if (!append) {
+                list_for_each_entry_safe (me, tmp, mountlist, mlist) {
+                        list_del (&me->mlist);
+                        GF_FREE (me);
+                }
+                me = NULL;
+        }
+
+        for (;;) {
+                char *value = NULL;
+
+                if (me && append) {
+                        /* do not add duplicates */
+                        list_for_each_entry (tmp, mountlist, mlist) {
+                                if (!strcmp(tmp->hostname, me->hostname) &&
+                                    !strcmp(tmp->exname, me->exname)) {
+                                        GF_FREE (me);
+                                        goto dont_add;
+                                }
+                        }
+                        list_add_tail (&me->mlist, mountlist);
+                } else if (me) {
+                        list_add_tail (&me->mlist, mountlist);
+                }
+
+dont_add:
+                me = GF_CALLOC (1, sizeof (*me), gf_nfs_mt_mountentry);
+                if (!me) {
+                        gf_log (GF_MNT, GF_LOG_ERROR, "Out of memory");
+                        ret = -1;
+                        goto out;
+                }
+
+                INIT_LIST_HEAD (&me->mlist);
+
+                snprintf (key, 9 + MNTPATHLEN, "hostname-%d", idx);
+                ret = gf_store_retrieve_value (sh, key, &value);
+                if (ret)
+                        break;
+                strncpy (me->hostname, value, MNTPATHLEN);
+                GF_FREE (value);
+
+                snprintf (key, 11 + MNTPATHLEN, "mountpoint-%d", idx);
+                ret = gf_store_retrieve_value (sh, key, &value);
+                if (ret)
+                        break;
+                strncpy (me->exname, value, MNTPATHLEN);
+                GF_FREE (value);
+
+                idx++;
+                gf_log (GF_MNT, GF_LOG_TRACE, "Read entries %s:%s", me->hostname, me->exname);
+        }
+        gf_log (GF_MNT, GF_LOG_DEBUG, "Read %d entries from '%s'", idx, sh->path);
+        GF_FREE (me);
+out:
+        return ret;
+}
+
+/* Overwrite the contents of the rwtab with te in-memory client list.
+ * Fail gracefully if the stora_handle is not locked.
+ */
+static void
+__mount_rewrite_rmtab(struct mount3_state *ms, gf_store_handle_t *sh)
+{
+        struct mountentry       *me = NULL;
+        char                    key[16];
+        int                     fd, ret;
+        unsigned int            idx = 0;
+
+        if (!gf_store_locked_local (sh)) {
+                gf_log (GF_MNT, GF_LOG_WARNING, "Not modifying unlocked %s",
+                        sh->path);
+                return;
+        }
+
+        fd = gf_store_mkstemp (sh);
+        if (fd == -1) {
+                gf_log (GF_MNT, GF_LOG_ERROR, "Failed to open %s", sh->path);
+                return;
+        }
+
+        list_for_each_entry (me, &ms->mountlist, mlist) {
+                snprintf (key, 16, "hostname-%d", idx);
+                ret = gf_store_save_value (fd, key, me->hostname);
+                if (ret)
+                        goto fail;
+
+                snprintf (key, 16, "mountpoint-%d", idx);
+                ret = gf_store_save_value (fd, key, me->exname);
+                if (ret)
+                        goto fail;
+
+                idx++;
+        }
+
+        gf_log (GF_MNT, GF_LOG_DEBUG, "Updated rmtab with %d entries", idx);
+
+        close (fd);
+        if (gf_store_rename_tmppath (sh))
+                gf_log (GF_MNT, GF_LOG_ERROR, "Failed to overwrite rwtab %s",
+                        sh->path);
+
+        return;
+
+fail:
+        gf_log (GF_MNT, GF_LOG_ERROR, "Failed to update %s", sh->path);
+        close (fd);
+        gf_store_unlink_tmppath (sh);
+}
+
+/* Read the rmtab into a clean ms->mountlist.
+ */
+static void
+mount_read_rmtab (struct mount3_state *ms)
+{
+        gf_store_handle_t       *sh = NULL;
+        struct nfs_state        *nfs = NULL;
+        int                     ret;
+
+        nfs = (struct nfs_state *)ms->nfsx->private;
+
+        ret = gf_store_handle_new (nfs->rmtab, &sh);
+        if (ret) {
+                gf_log (GF_MNT, GF_LOG_WARNING, "Failed to open '%s'",
+                        nfs->rmtab);
+                return;
+        }
+
+        if (gf_store_lock (sh)) {
+                gf_log (GF_MNT, GF_LOG_WARNING, "Failed to lock '%s'",
+                        nfs->rmtab);
+                goto out;
+        }
+
+        __mount_read_rmtab (sh, &ms->mountlist, _gf_false);
+        gf_store_unlock (sh);
+
+out:
+        gf_store_handle_destroy (sh);
+}
+
+/* Write the ms->mountlist to the rmtab.
+ *
+ * The rmtab could be empty, or it can exists and have been updated by a
+ * different storage server without our knowing.
+ *
+ * 1. takes the store_handle lock on the current rmtab
+ *    - blocks if an other storage server rewrites the rmtab at the same time
+ * 2. [if new_rmtab] takes the store_handle lock on the new rmtab
+ * 3. reads/merges the entries from the current rmtab
+ * 4. [if new_rmtab] reads/merges the entries from the new rmtab
+ * 5. [if new_rmtab] writes the new rmtab
+ * 6. [if not new_rmtab] writes the current rmtab
+ * 7  [if new_rmtab] replaces nfs->rmtab to point to the new location
+ * 8. [if new_rmtab] releases the store_handle lock of the new rmtab
+ * 9. releases the store_handle lock of the old rmtab
+ */
+void
+mount_rewrite_rmtab (struct mount3_state *ms, char *new_rmtab)
+{
+        gf_store_handle_t       *sh = NULL, *nsh = NULL;
+        struct nfs_state        *nfs = NULL;
+        int                     ret;
+        char                    *rmtab = NULL;
+
+        nfs = (struct nfs_state *)ms->nfsx->private;
+
+        ret = gf_store_handle_new (nfs->rmtab, &sh);
+        if (ret) {
+                gf_log (GF_MNT, GF_LOG_WARNING, "Failed to open '%s'",
+                        nfs->rmtab);
+                return;
+        }
+
+        if (gf_store_lock (sh)) {
+                gf_log (GF_MNT, GF_LOG_WARNING, "Not rewriting '%s'",
+                        nfs->rmtab);
+                goto free_sh;
+        }
+
+        if (new_rmtab) {
+                ret = gf_store_handle_new (new_rmtab, &nsh);
+                if (ret) {
+                        gf_log (GF_MNT, GF_LOG_WARNING, "Failed to open '%s'",
+                                new_rmtab);
+                        goto unlock_sh;
+                }
+
+                if (gf_store_lock (nsh)) {
+                        gf_log (GF_MNT, GF_LOG_WARNING, "Not rewriting '%s'",
+                                new_rmtab);
+                        goto free_nsh;
+                }
+        }
 
+        /* always read the currently used rmtab */
+        __mount_read_rmtab (sh, &ms->mountlist, _gf_true);
+
+        if (new_rmtab) {
+                /* read the new rmtab and write changes to the new location */
+                __mount_read_rmtab (nsh, &ms->mountlist, _gf_true);
+                __mount_rewrite_rmtab (ms, nsh);
+
+                /* replace the nfs->rmtab reference to the new rmtab */
+                rmtab = gf_strdup(new_rmtab);
+                if (rmtab == NULL) {
+                        gf_log (GF_MNT, GF_LOG_ERROR, "Out of memory, keeping "
+                                "%s as rmtab", nfs->rmtab);
+                } else {
+                        GF_FREE (nfs->rmtab);
+                        nfs->rmtab = new_rmtab;
+                }
+
+                gf_store_unlock (nsh);
+        } else {
+                /* rewrite the current (unchanged location) rmtab */
+                __mount_rewrite_rmtab (ms, sh);
+        }
+
+free_nsh:
+        if (new_rmtab)
+                gf_store_handle_destroy (nsh);
+unlock_sh:
+        gf_store_unlock (sh);
+free_sh:
+        gf_store_handle_destroy (sh);
+}
+
+/* Add a new NFS-client to the ms->mountlist and update the rmtab if we can.
+ *
+ * A NFS-client will only be removed from the ms->mountlist in case the
+ * NFS-client sends a unmount request. It is possible that a NFS-client
+ * crashed/rebooted had network loss or something else prevented the NFS-client
+ * to unmount cleanly. In this case, a duplicate entry would be added to the
+ * ms->mountlist, which is wrong and we should prevent.
+ *
+ * It is fully acceptible that the ms->mountlist is not 100% correct, this is a
+ * common issue for all(?) NFS-servers.
+ */
 int
 mnt3svc_update_mountlist (struct mount3_state *ms, rpcsvc_request_t *req,
                           char  *expname)
 {
         struct mountentry       *me = NULL;
+        struct mountentry       *cur = NULL;
         int                     ret = -1;
         char                    *colon = NULL;
+        struct nfs_state        *nfs = NULL;
+        gf_store_handle_t       *sh = NULL;
 
         if ((!ms) || (!req) || (!expname))
                 return -1;
@@ -205,14 +517,24 @@ mnt3svc_update_mountlist (struct mount3_state *ms, rpcsvc_request_t *req,
         if (!me)
                 return -1;
 
-        strcpy (me->exname, expname);
+        nfs = (struct nfs_state *)ms->nfsx->private;
+
+        ret = gf_store_handle_new (nfs->rmtab, &sh);
+        if (ret) {
+                gf_log (GF_MNT, GF_LOG_WARNING, "Failed to open '%s'",
+                        nfs->rmtab);
+                goto free_err;
+        }
+
+        strncpy (me->exname, expname, MNTPATHLEN);
+
         INIT_LIST_HEAD (&me->mlist);
         /* Must get the IP or hostname of the client so we
          * can map it into the mount entry.
          */
         ret = rpcsvc_transport_peername (req->trans, me->hostname, MNTPATHLEN);
         if (ret == -1)
-                goto free_err;
+                goto free_err2;
 
         colon = strrchr (me->hostname, ':');
         if (colon) {
@@ -220,10 +542,37 @@ mnt3svc_update_mountlist (struct mount3_state *ms, rpcsvc_request_t *req,
         }
         LOCK (&ms->mountlock);
         {
+                /* in case locking fails, we just don't write the rmtab */
+                if (gf_store_lock (sh)) {
+                        gf_log (GF_MNT, GF_LOG_WARNING, "Failed to lock '%s'"
+                                ", changes will not be written", nfs->rmtab);
+                } else {
+                        __mount_read_rmtab (sh, &ms->mountlist, _gf_false);
+                }
+
+                /* do not add duplicates */
+                list_for_each_entry (cur, &ms->mountlist, mlist) {
+                        if (!strcmp(cur->hostname, me->hostname) &&
+                            !strcmp(cur->exname, me->exname)) {
+                                GF_FREE (me);
+                                goto dont_add;
+                        }
+                }
                 list_add_tail (&me->mlist, &ms->mountlist);
+
+                /* only write the rmtab in case it was locked */
+                if (gf_store_locked_local (sh))
+                        __mount_rewrite_rmtab (ms, sh);
         }
+dont_add:
+        if (gf_store_locked_local (sh))
+                gf_store_unlock (sh);
+
         UNLOCK (&ms->mountlock);
 
+free_err2:
+        gf_store_handle_destroy (sh);
+
 free_err:
         if (ret == -1)
                 GF_FREE (me);
@@ -242,6 +591,7 @@ __mnt3_get_volume_id (struct mount3_state *ms, xlator_t *mntxl,
         if ((!ms) || (!mntxl))
                 return ret;
 
+        LOCK (&ms->mountlock);
         list_for_each_entry (exp, &ms->exportlist, explist) {
                 if (exp->vol == mntxl) {
                         uuid_copy (volumeid, exp->volumeid);
@@ -251,6 +601,7 @@ __mnt3_get_volume_id (struct mount3_state *ms, xlator_t *mntxl,
         }
 
 out:
+        UNLOCK (&ms->mountlock);
         return ret;
 }
 
@@ -271,7 +622,7 @@ mnt3svc_lookup_mount_cbk (call_frame_t *frame, void  *cookie,
         rpcsvc_t                *svc = NULL;
         xlator_t                *mntxl = NULL;
         uuid_t                  volumeid = {0, };
-        char                    fhstr[1024];
+        char                    fhstr[1024], *path = NULL;
 
         req = (rpcsvc_request_t *)frame->local;
 
@@ -293,7 +644,15 @@ mnt3svc_lookup_mount_cbk (call_frame_t *frame, void  *cookie,
         if (status != MNT3_OK)
                 goto xmit_res;
 
-        mnt3svc_update_mountlist (ms, req, mntxl->name);
+        path = GF_CALLOC (PATH_MAX, sizeof (char), gf_nfs_mt_char);
+        if (!path) {
+                gf_log (GF_MNT, GF_LOG_ERROR, "Out of memory");
+                goto xmit_res;
+        }
+
+        snprintf (path, PATH_MAX, "/%s", mntxl->name);
+        mnt3svc_update_mountlist (ms, req, path);
+        GF_FREE (path);
         if (gf_nfs_dvm_off (nfs_state (ms->nfsx))) {
                 fh = nfs3_fh_build_indexed_root_fh (ms->nfsx->children, mntxl);
                 goto xmit_res;
@@ -303,7 +662,7 @@ mnt3svc_lookup_mount_cbk (call_frame_t *frame, void  *cookie,
         fh = nfs3_fh_build_uuid_root_fh (volumeid);
 
 xmit_res:
-        nfs3_fh_to_str (&fh, fhstr);
+        nfs3_fh_to_str (&fh, fhstr, sizeof (fhstr));
         gf_log (GF_MNT, GF_LOG_DEBUG, "MNT reply: fh %s, status: %d", fhstr,
                 status);
         if (op_ret == 0) {
@@ -467,8 +826,8 @@ mnt3_resolve_state_wipe (mnt3_resolve_t *mres)
 /* Sets up the component argument to contain the next component in the path and
  * sets up path as an absolute path starting from the next component.
  */
-char *
-__setup_next_component (char *path, char *component)
+static char *
+setup_next_component (char *path, size_t plen, char *component, size_t clen)
 {
         char    *comp = NULL;
         char    *nextcomp = NULL;
@@ -476,7 +835,7 @@ __setup_next_component (char *path, char *component)
         if ((!path) || (!component))
                 return NULL;
 
-        strcpy (component, path);
+        strncpy (component, path, clen);
         comp = index (component, (int)'/');
         if (!comp)
                 goto err;
@@ -484,7 +843,7 @@ __setup_next_component (char *path, char *component)
         comp++;
         nextcomp = index (comp, (int)'/');
         if (nextcomp) {
-                strcpy (path, nextcomp);
+                strncpy (path, nextcomp, plen);
                 *nextcomp = '\0';
         } else
                 path[0] = '\0';
@@ -514,7 +873,9 @@ __mnt3_resolve_export_subdir_comp (mnt3_resolve_t *mres)
         if (!mres)
                 return ret;
 
-        nextcomp = __setup_next_component (mres->remainingdir, dupsubdir);
+        nextcomp = setup_next_component (mres->remainingdir,
+                                         sizeof (mres->remainingdir),
+                                         dupsubdir, sizeof (dupsubdir));
         if (!nextcomp)
                 goto err;
 
@@ -526,7 +887,7 @@ __mnt3_resolve_export_subdir_comp (mnt3_resolve_t *mres)
         if ((ret < 0) && (ret != -2)) {
                 gf_log (GF_MNT, GF_LOG_ERROR, "Failed to resolve and create "
                         "inode: parent gfid %s, entry %s",
-                        uuid_utoa (mres->resolveloc.inode->gfid), nextcomp);
+                        uuid_utoa (gfid), nextcomp);
                 ret = -EFAULT;
                 goto err;
         }
@@ -554,6 +915,7 @@ mnt3_resolve_subdir_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
         rpcsvc_t                *svc = NULL;
         mountres3               res = {0, };
         xlator_t                *mntxl = NULL;
+        char                    *path = NULL;
 
         mres = frame->local;
         mntxl = (xlator_t *)cookie;
@@ -571,15 +933,23 @@ mnt3_resolve_subdir_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
         if (strlen (mres->remainingdir) <= 0) {
                 op_ret = -1;
                 mntstat = MNT3_OK;
+                path = GF_CALLOC (PATH_MAX, sizeof (char), gf_nfs_mt_char);
+                if (!path) {
+                        gf_log (GF_MNT, GF_LOG_ERROR, "Memory allocation "
+                                "failed");
+                        goto err;
+                }
+                snprintf (path, PATH_MAX, "/%s%s", mres->exp->vol->name,
+                         mres->resolveloc.path);
                 mnt3svc_update_mountlist (mres->mstate, mres->req,
-                                          mres->exp->expname);
-                goto err;
+                                          path);
+                GF_FREE (path);
+        } else {
+                mres->parentfh = fh;
+                op_ret = __mnt3_resolve_export_subdir_comp (mres);
+                if (op_ret < 0)
+                        mntstat = mnt3svc_errno_to_mnterr (-op_ret);
         }
-
-        mres->parentfh = fh;
-        op_ret = __mnt3_resolve_export_subdir_comp (mres);
-        if (op_ret < 0)
-                mntstat = mnt3svc_errno_to_mnterr (-op_ret);
 err:
         if (op_ret == -1) {
                 gf_log (GF_MNT, GF_LOG_DEBUG, "Mount reply status: %d",
@@ -622,7 +992,9 @@ __mnt3_resolve_subdir (mnt3_resolve_t *mres)
         if (!mres)
                 return ret;
 
-        firstcomp = __setup_next_component (mres->remainingdir, dupsubdir);
+        firstcomp = setup_next_component (mres->remainingdir,
+                                          sizeof (mres->remainingdir),
+                                          dupsubdir, sizeof (dupsubdir));
         if (!firstcomp)
                 goto err;
 
@@ -645,6 +1017,132 @@ err:
 }
 
 
+/**
+ * This function will verify if the client is allowed to mount
+ * the directory or not. Client's IP address will be compared with
+ * allowed IP list or range present in mnt3_export structure.
+ *
+ * @param req - RPC request. This structure contains client's IP address.
+ * @param export - mnt3_export structure. Contains allowed IP list/range.
+ *
+ * @return 0 - on Success and -EACCES on failure.
+ */
+int
+mnt3_verify_auth (rpcsvc_request_t *req, struct mnt3_export *export)
+{
+        int                     retvalue = -EACCES;
+        int                     ret = 0;
+        int                     shiftbits = 0;
+        uint32_t                ipv4netmask = 0;
+        uint32_t                routingprefix = 0;
+        struct host_auth_spec   *host = NULL;
+        struct sockaddr_in      *client_addr = NULL;
+        struct sockaddr_in      *allowed_addr = NULL;
+        struct addrinfo         *allowed_addrinfo = NULL;
+
+        /* Sanity check */
+        if ((NULL == req) ||
+            (NULL == req->trans) ||
+            (NULL == export) ||
+            (NULL == export->hostspec)) {
+                gf_log (GF_MNT, GF_LOG_ERROR, "Invalid argument");
+                return retvalue;
+        }
+
+        host = export->hostspec;
+
+
+        /* Client's IP address. */
+        client_addr = (struct sockaddr_in *)(&(req->trans->peerinfo.sockaddr));
+
+        /* Try to see if the client IP matches the allowed IP list.*/
+        while (NULL != host){
+                GF_ASSERT (host->host_addr);
+
+                if (NULL != allowed_addrinfo) {
+                        freeaddrinfo (allowed_addrinfo);
+                        allowed_addrinfo = NULL;
+                }
+
+                /* Get the addrinfo for the allowed host (host_addr). */
+                ret = getaddrinfo (host->host_addr,
+                                NULL,
+                                NULL,
+                                &allowed_addrinfo);
+                if (0 != ret){
+                        gf_log (GF_MNT, GF_LOG_ERROR, "getaddrinfo: %s\n",
+                                gai_strerror (ret));
+                        host = host->next;
+
+                        /* Failed to get IP addrinfo. Continue to check other
+                         * allowed IPs in the list.
+                         */
+                        continue;
+                }
+
+                allowed_addr = (struct sockaddr_in *)(allowed_addrinfo->ai_addr);
+
+                if (NULL == allowed_addr) {
+                        gf_log (GF_MNT, GF_LOG_ERROR, "Invalid structure");
+                        break;
+                }
+
+                if (AF_INET == allowed_addr->sin_family){
+                        if (IPv4_ADDR_SIZE < host->routeprefix) {
+                                gf_log (GF_MNT, GF_LOG_ERROR, "invalid IP "
+                                        "configured for export-dir AUTH");
+                                host = host->next;
+                                continue;
+                        }
+
+                        /* -1 means no route prefix is provided. In this case
+                         * the IP should be an exact match. Which is same as
+                         * providing a route prefix of IPv4_ADDR_SIZE.
+                         */
+                        if (-1 == host->routeprefix) {
+                                routingprefix = IPv4_ADDR_SIZE;
+                        } else {
+                                routingprefix = host->routeprefix;
+                        }
+
+                        /* Create a mask from the routing prefix. User provided
+                         * CIDR address is split into IP address (host_addr) and
+                         * routing prefix (routeprefix). This CIDR address may
+                         * denote a single, distinct interface address or the
+                         * beginning address of an entire network.
+                         *
+                         * e.g. the IPv4 block 192.168.100.0/24 represents the
+                         * 256 IPv4 addresses from 192.168.100.0 to
+                         * 192.168.100.255.
+                         * Therefore to check if an IP matches 192.168.100.0/24
+                         * we should mask the IP with FFFFFF00 and compare it
+                         * with host address part of CIDR.
+                         */
+                        shiftbits = IPv4_ADDR_SIZE - routingprefix;
+                        ipv4netmask = 0xFFFFFFFFUL << shiftbits;
+
+                        /* Mask both the IPs and then check if they match
+                         * or not. */
+                        if (COMPARE_IPv4_ADDRS (allowed_addr,
+                                                client_addr,
+                                                ipv4netmask)){
+                                retvalue = 0;
+                                break;
+                        }
+                }
+
+                /* Client IP didn't match the allowed IP.
+                 * Check with the next allowed IP.*/
+               host = host->next;
+        }
+
+        if (NULL != allowed_addrinfo) {
+               freeaddrinfo (allowed_addrinfo);
+        }
+
+        return retvalue;
+}
+
 int
 mnt3_resolve_subdir (rpcsvc_request_t *req, struct mount3_state *ms,
                      struct mnt3_export *exp, char *subdir)
@@ -656,6 +1154,16 @@ mnt3_resolve_subdir (rpcsvc_request_t *req, struct mount3_state *ms,
         if ((!req) || (!ms) || (!exp) || (!subdir))
                 return ret;
 
+        /* Need to check AUTH */
+        if (NULL != exp->hostspec) {
+                ret = mnt3_verify_auth (req, exp);
+                if (0 != ret) {
+                        gf_log (GF_MNT,GF_LOG_ERROR,
+                                        "AUTH verification failed");
+                        return ret;
+                }
+        }
+
         mres = GF_CALLOC (1, sizeof (mnt3_resolve_t), gf_nfs_mt_mnt3_resolve);
         if (!mres) {
                 gf_log (GF_MNT, GF_LOG_ERROR, "Memory allocation failed");
@@ -665,7 +1173,7 @@ mnt3_resolve_subdir (rpcsvc_request_t *req, struct mount3_state *ms,
         mres->exp = exp;
         mres->mstate = ms;
         mres->req = req;
-        strcpy (mres->remainingdir, subdir);
+        strncpy (mres->remainingdir, subdir, MNTPATHLEN);
         if (gf_nfs_dvm_off (nfs_state (ms->nfsx)))
                 pfh = nfs3_fh_build_indexed_root_fh (mres->mstate->nfsx->children, mres->exp->vol);
         else
@@ -740,6 +1248,7 @@ mnt3_mntpath_to_export (struct mount3_state *ms, char *dirpath)
         if ((!ms) || (!dirpath))
                 return NULL;
 
+        LOCK (&ms->mountlock);
         list_for_each_entry (exp, &ms->exportlist, explist) {
 
                 /* Search for the an exact match with the volume */
@@ -753,6 +1262,7 @@ mnt3_mntpath_to_export (struct mount3_state *ms, char *dirpath)
 
         gf_log (GF_MNT, GF_LOG_DEBUG, "Export not found");
 foundexp:
+        UNLOCK (&ms->mountlock);
         return found;
 }
 
@@ -781,8 +1291,7 @@ mnt3_check_client_net (struct mount3_state *ms, rpcsvc_request_t *req,
                         gai_strerror (ret));
         }
 
-        ret = rpcsvc_transport_peer_check (svc->options, targetxl->name,
-                                           trans);
+        ret = rpcsvc_auth_check (svc, targetxl->name, trans);
         if (ret == RPCSVC_AUTH_REJECT) {
                 gf_log (GF_MNT, GF_LOG_INFO, "Peer %s  not allowed", peer);
                 goto err;
@@ -977,6 +1486,9 @@ __build_mountlist (struct mount3_state *ms, int *count)
         if ((!ms) || (!count))
                 return NULL;
 
+        /* read rmtab, other peers might have updated it */
+        mount_read_rmtab(ms);
+
         *count = 0;
         gf_log (GF_MNT, GF_LOG_DEBUG, "Building mount list:");
         list_for_each_entry (me, &ms->mountlist, mlist) {
@@ -987,6 +1499,8 @@ __build_mountlist (struct mount3_state *ms, int *count)
                                 " failed");
                         goto free_list;
                 }
+                if (!first)
+                        first = mlist;
 
                 mlist->ml_directory = GF_CALLOC (namelen + 2, sizeof (char),
                                                  gf_nfs_mt_char);
@@ -996,8 +1510,7 @@ __build_mountlist (struct mount3_state *ms, int *count)
                         goto free_list;
                 }
 
-                strcpy (mlist->ml_directory, "/");
-                strcat (mlist->ml_directory, me->exname);
+                strcpy (mlist->ml_directory, me->exname);
 
                 namelen = strlen (me->hostname);
                 mlist->ml_hostname = GF_CALLOC (namelen + 2, sizeof (char),
@@ -1018,9 +1531,6 @@ __build_mountlist (struct mount3_state *ms, int *count)
                 } else
                         prev = mlist;
 
-                if (!first)
-                        first = mlist;
-
                 (*count)++;
         }
 
@@ -1097,67 +1607,71 @@ rpcerr:
 
 
 int
-__mnt3svc_umount (struct mount3_state *ms, char *dirpath, char *hostname)
+mnt3svc_umount (struct mount3_state *ms, char *dirpath, char *hostname)
 {
         struct mountentry       *me = NULL;
-        char                    *exname = NULL;
         int                     ret = -1;
+        gf_store_handle_t       *sh = NULL;
+        struct nfs_state        *nfs = NULL;
 
         if ((!ms) || (!dirpath) || (!hostname))
                 return -1;
 
-        if (list_empty (&ms->mountlist))
-                return 0;
-
-        if (dirpath[0] == '/')
-                exname = dirpath+1;
-        else
-                exname = dirpath;
+        nfs = (struct nfs_state *)ms->nfsx->private;
 
-        list_for_each_entry (me, &ms->mountlist, mlist) {
-               if ((strcmp (me->exname, exname) == 0) &&
-                    (strcmp (me->hostname, hostname) == 0)) {
-                       ret = 0;
-                       break;
-               }
+        ret = gf_store_handle_new (nfs->rmtab, &sh);
+        if (ret) {
+                gf_log (GF_MNT, GF_LOG_WARNING, "Failed to open '%s'",
+                        nfs->rmtab);
+                return 0;
         }
 
-        /* Need this check here because at the end of the search me might still
-         * be pointing to the last entry, which may not be the one we're
-         * looking for.
-         */
-        if (ret == -1)  {/* Not found in list. */
-                gf_log (GF_MNT, GF_LOG_DEBUG, "Export not found");
-                goto ret;
+        ret = gf_store_lock (sh);
+        if (ret) {
+                goto out_free;
         }
 
-        if (!me)
-                goto ret;
+        LOCK (&ms->mountlock);
+        {
+                __mount_read_rmtab (sh, &ms->mountlist, _gf_false);
+                if (list_empty (&ms->mountlist)) {
+                        ret = 0;
+                        goto out_unlock;
+                }
 
-        gf_log (GF_MNT, GF_LOG_DEBUG, "Unmounting: dir %s, host: %s",
-                me->exname, me->hostname);
-        list_del (&me->mlist);
-        GF_FREE (me);
-        ret = 0;
-ret:
-        return ret;
-}
+                ret = -1;
+                list_for_each_entry (me, &ms->mountlist, mlist) {
+                       if ((strcmp (me->exname, dirpath) == 0) &&
+                            (strcmp (me->hostname, hostname) == 0)) {
+                               ret = 0;
+                               break;
+                       }
+                }
 
+                /* Need this check here because at the end of the search me
+                 * might still be pointing to the last entry, which may not be
+                 * the one we're looking for.
+                 */
+                if (ret == -1)  {/* Not found in list. */
+                        gf_log (GF_MNT, GF_LOG_TRACE, "Export not found");
+                        goto out_unlock;
+                }
 
+                if (!me)
+                        goto out_unlock;
 
-int
-mnt3svc_umount (struct mount3_state *ms, char *dirpath, char *hostname)
-{
-        int ret = -1;
-        if ((!ms) || (!dirpath) || (!hostname))
-                return -1;
+                gf_log (GF_MNT, GF_LOG_DEBUG, "Unmounting: dir %s, host: %s",
+                        me->exname, me->hostname);
 
-        LOCK (&ms->mountlock);
-        {
-               ret = __mnt3svc_umount (ms, dirpath, hostname);
+                list_del (&me->mlist);
+                GF_FREE (me);
+                __mount_rewrite_rmtab (ms, sh);
         }
+out_unlock:
         UNLOCK (&ms->mountlock);
-
+        gf_store_unlock (sh);
+out_free:
+        gf_store_handle_destroy (sh);
         return ret;
 }
 
@@ -1305,6 +1819,10 @@ mnt3_xlchildren_to_exports (rpcsvc_t *svc, struct mount3_state *ms)
                 return NULL;
 
         nfs = (struct nfs_state *)ms->nfsx->private;
+        if (!nfs)
+                return NULL;
+
+        LOCK (&ms->mountlock);
         list_for_each_entry(ent, &ms->exportlist, explist) {
 
                 /* If volume is not started yet, do not list it for tools like
@@ -1320,7 +1838,8 @@ mnt3_xlchildren_to_exports (rpcsvc_t *svc, struct mount3_state *ms)
                                 " failed");
                         goto free_list;
                 }
-
+                 if (!first)
+                         first = elist;
                 elist->ex_dir = GF_CALLOC (namelen + 2, sizeof (char),
                                            gf_nfs_mt_char);
                 if (!elist->ex_dir) {
@@ -1328,16 +1847,10 @@ mnt3_xlchildren_to_exports (rpcsvc_t *svc, struct mount3_state *ms)
                                 " failed");
                         goto free_list;
                 }
-
                 strcpy (elist->ex_dir, ent->expname);
 
                 addrstr = rpcsvc_volume_allowed (svc->options,
                                                  ent->vol->name);
-                if (addrstr)
-                        addrstr = gf_strdup (addrstr);
-                else
-                        addrstr = gf_strdup ("No Access");
-
                 elist->ex_groups = GF_CALLOC (1, sizeof (struct groupnode),
                                               gf_nfs_mt_groupnode);
                 if (!elist->ex_groups) {
@@ -1345,21 +1858,29 @@ mnt3_xlchildren_to_exports (rpcsvc_t *svc, struct mount3_state *ms)
                                 " failed");
                         goto free_list;
                 }
+                /*This check has to be done after checking
+                 * elist->ex_groups allocation check to avoid resource leak;
+                */
+                if (addrstr)
+                        addrstr = gf_strdup (addrstr);
+                else
+                        addrstr = gf_strdup ("No Access");
 
+                if (!addrstr) {
+                        goto free_list;
+                }
                 elist->ex_groups->gr_name = addrstr;
                 if (prev) {
                         prev->ex_next = elist;
                         prev = elist;
                 } else
                         prev = elist;
-
-                if (!first)
-                        first = elist;
         }
 
         ret = 0;
 
 free_list:
+        UNLOCK (&ms->mountlock);
         if (ret == -1) {
                 xdr_free_exports_list (first);
                 first = NULL;
@@ -1465,12 +1986,13 @@ mount3udp_add_mountlist (char *host, dirpath *expname)
         while (*export == '/')
                 export++;
 
-        strcpy (me->exname, export);
-        strcpy (me->hostname, host);
+        strncpy (me->exname, export, MNTPATHLEN);
+        strncpy (me->hostname, host, MNTPATHLEN);
         INIT_LIST_HEAD (&me->mlist);
         LOCK (&ms->mountlock);
         {
                 list_add_tail (&me->mlist, &ms->mountlist);
+                mount_rewrite_rmtab(ms, NULL);
         }
         UNLOCK (&ms->mountlock);
         return 0;
@@ -1486,11 +2008,155 @@ mount3udp_delete_mountlist (char *hostname, dirpath *expname)
         export = (char *)expname;
         while (*export == '/')
                 export++;
-        __mnt3svc_umount (ms, export, hostname);
+        mnt3svc_umount (ms, export, hostname);
         return 0;
 }
 
+/**
+ * This function will parse the hostip (IP addres, IP range, or hostname)
+ * and fill the host_auth_spec structure.
+ *
+ * @param hostspec - struct host_auth_spec
+ * @param hostip   - IP address, IP range (CIDR format) or hostname
+ *
+ * @return 0 - on success and -1 on failure
+ */
+int
+mnt3_export_fill_hostspec (struct host_auth_spec* hostspec, const char* hostip)
+{
+        char *ipdupstr = NULL;
+        char *savptr = NULL;
+        char *ip = NULL;
+        char *token = NULL;
+        int  ret = -1;
+
+        /* Create copy of the string so that the source won't change
+         */
+        ipdupstr = gf_strdup (hostip);
+        if (NULL == ipdupstr) {
+                gf_log (GF_MNT, GF_LOG_ERROR, "Memory allocation failed");
+                goto err;
+        }
+
+        ip = strtok_r (ipdupstr, "/", &savptr);
+        hostspec->host_addr = gf_strdup (ip);
+        if (NULL == hostspec->host_addr) {
+                gf_log (GF_MNT, GF_LOG_ERROR, "Memory allocation failed");
+                goto err;
+        }
+
+        /* Check if the IP is in <IP address> / <Range> format.
+         * If yes, then strip the range and store it separately.
+         */
+        token = strtok_r (NULL, "/", &savptr);
+
+        if (NULL == token) {
+              hostspec->routeprefix = -1;
+        } else {
+              hostspec->routeprefix = atoi (token);
+        }
+
+        // success
+        ret = 0;
+err:
+        if (NULL != ipdupstr) {
+                GF_FREE (ipdupstr);
+        }
+        return ret;
+}
+
+
+/**
+ * This function will parse the AUTH parameter passed along with
+ * "export-dir" option. If AUTH parameter is present then it will be
+ * stripped from exportpath and stored in mnt3_export (exp) structure.
+ *
+ * @param exp - mnt3_export structure. Holds information needed for mount.
+ * @param exportpath - Value of "export-dir" key. Holds both export path
+ *                     and AUTH parameter for the path.
+ *                     exportpath format: <abspath>[(hostdesc[|hostspec|...])]
+ *
+ * @return This function will return 0 on success and -1 on failure.
+ */
+int
+mnt3_export_parse_auth_param (struct mnt3_export* exp, char* exportpath)
+{
+        char *token = NULL;
+        char *savPtr = NULL;
+        char *hostip = NULL;
+        struct host_auth_spec *host = NULL;
+        int ret = 0;
+
+        /* Using exportpath directly in strtok_r because we want
+         * to strip off AUTH parameter from exportpath. */
+        token = strtok_r (exportpath, "(", &savPtr);
+
+        /* Get the next token, which will be the AUTH parameter. */
+        token = strtok_r (NULL, ")", &savPtr);
+
+        if (NULL == token) {
+                /* If AUTH is not present then we should return success. */
+                return 0;
+        }
+
+        /* Free any previously allocated hostspec structure. */
+        if (NULL != exp->hostspec) {
+                GF_FREE (exp->hostspec);
+                exp->hostspec = NULL;
+        }
+
+        exp->hostspec = GF_CALLOC (1,
+                        sizeof (*(exp->hostspec)),
+                        gf_nfs_mt_auth_spec);
+        if (NULL == exp->hostspec){
+                gf_log (GF_MNT, GF_LOG_ERROR, "Memory allocation failed");
+                return -1;
+        }
+
+        /* AUTH parameter can have multiple entries. For each entry
+         * a host_auth_spec structure is created. */
+        host = exp->hostspec;
+
+        hostip = strtok_r (token, "|", &savPtr);
+
+        /* Parse all AUTH parameters separated by '|' */
+        while (NULL != hostip){
+                ret = mnt3_export_fill_hostspec (host, hostip);
+                if (0 != ret) {
+                        gf_log(GF_MNT, GF_LOG_WARNING,
+                                        "Failed to parse hostspec: %s", hostip);
+                        goto err;
+                }
+
+                hostip = strtok_r (NULL, "|", &savPtr);
+                if (NULL == hostip) {
+                        break;
+                }
+
+                host->next = GF_CALLOC (1, sizeof (*(host)),
+                                gf_nfs_mt_auth_spec);
+                if (NULL == host->next){
+                        gf_log (GF_MNT,GF_LOG_ERROR,
+                                        "Memory allocation failed");
+                        goto err;
+                }
+                host = host->next;
+        }
+
+        /* In case of success return from here */
+        return 0;
+err:
+        /* In case of failure free up hostspec structure.  */
+        FREE_HOSTSPEC (exp);
+
+        return -1;
+}
 
+/**
+ * exportpath will also have AUTH options (ip address, subnet address or
+ * hostname) mentioned.
+ * exportpath format: <abspath>[(hostdesc[|hostspec|...])]
+ */
 struct mnt3_export *
 mnt3_init_export_ent (struct mount3_state *ms, xlator_t *xl, char *exportpath,
                       uuid_t volumeid)
@@ -1508,6 +2174,20 @@ mnt3_init_export_ent (struct mount3_state *ms, xlator_t *xl, char *exportpath,
                 return NULL;
         }
 
+        if (NULL != exportpath) {
+                /* If exportpath is not NULL then we should check if AUTH
+                 * parameter is present or not. If AUTH parameter is present
+                 * then it will be stripped and stored in mnt3_export (exp)
+                 * structure.
+                 */
+                if (0 != mnt3_export_parse_auth_param (exp, exportpath)){
+                        gf_log (GF_MNT, GF_LOG_ERROR,
+                                                "Failed to parse auth param");
+                        goto err;
+                }
+        }
+
+
         INIT_LIST_HEAD (&exp->explist);
         if (exportpath)
                 alloclen = strlen (xl->name) + 2 + strlen (exportpath);
@@ -1517,8 +2197,6 @@ mnt3_init_export_ent (struct mount3_state *ms, xlator_t *xl, char *exportpath,
         exp->expname = GF_CALLOC (alloclen, sizeof (char), gf_nfs_mt_char);
         if (!exp->expname) {
                 gf_log (GF_MNT, GF_LOG_ERROR, "Memory allocation failed");
-                GF_FREE (exp);
-                exp = NULL;
                 goto err;
         }
 
@@ -1535,8 +2213,9 @@ mnt3_init_export_ent (struct mount3_state *ms, xlator_t *xl, char *exportpath,
                 ret = snprintf (exp->expname, alloclen, "/%s", xl->name);
         }
         if (ret < 0) {
-                gf_log (xl->name, GF_LOG_WARNING,
-                        "failed to get the export name");
+                gf_log (xl->name, GF_LOG_ERROR,
+                        "Failed to set the export name");
+                goto err;
         }
         /* Just copy without discrimination, we'll determine whether to
          * actually use it when a mount request comes in and a file handle
@@ -1544,7 +2223,16 @@ mnt3_init_export_ent (struct mount3_state *ms, xlator_t *xl, char *exportpath,
          */
         uuid_copy (exp->volumeid, volumeid);
         exp->vol = xl;
+
+        /* On success we should return from here*/
+        return exp;
 err:
+        /* On failure free exp and it's members.*/
+        if (NULL != exp) {
+                mnt3_export_free (exp);
+                exp = NULL;
+        }
+
         return exp;
 }
 
@@ -1705,8 +2393,11 @@ __mnt3_init_volume_export (struct mount3_state *ms, dict_t *opts)
                 goto err;
         }
 
-        gf_string2boolean (optstr, &boolt);
-        ret = 0;
+        ret = gf_string2boolean (optstr, &boolt);
+        if (ret < 0) {
+                gf_log (GF_MNT, GF_LOG_ERROR, "Failed to convert"
+                        " string to boolean");
+        }
 
 err:
         if (boolt == _gf_false) {
@@ -1745,8 +2436,11 @@ __mnt3_init_dir_export (struct mount3_state *ms, dict_t *opts)
                 goto err;
         }
 
-        gf_string2boolean (optstr, &boolt);
-        ret = 0;
+        ret = gf_string2boolean (optstr, &boolt);
+        if (ret < 0) {
+                gf_log (GF_MNT, GF_LOG_ERROR, "Failed to convert"
+                        " string to boolean");
+         }
 
 err:
         if (boolt == _gf_false) {
@@ -1844,12 +2538,12 @@ out:
 }
 
 rpcsvc_actor_t  mnt3svc_actors[MOUNT3_PROC_COUNT] = {
-        {"NULL", MOUNT3_NULL, mnt3svc_null, NULL, 0},
-        {"MNT", MOUNT3_MNT, mnt3svc_mnt, NULL, 0},
-        {"DUMP", MOUNT3_DUMP, mnt3svc_dump, NULL, 0},
-        {"UMNT", MOUNT3_UMNT, mnt3svc_umnt, NULL, 0},
-        {"UMNTALL", MOUNT3_UMNTALL, mnt3svc_umntall, NULL, 0},
-        {"EXPORT", MOUNT3_EXPORT, mnt3svc_export, NULL, 0}
+        {"NULL",    MOUNT3_NULL,    mnt3svc_null,    NULL, 0, DRC_NA},
+        {"MNT",     MOUNT3_MNT,     mnt3svc_mnt,     NULL, 0, DRC_NA},
+        {"DUMP",    MOUNT3_DUMP,    mnt3svc_dump,    NULL, 0, DRC_NA},
+        {"UMNT",    MOUNT3_UMNT,    mnt3svc_umnt,    NULL, 0, DRC_NA},
+        {"UMNTALL", MOUNT3_UMNTALL, mnt3svc_umntall, NULL, 0, DRC_NA},
+        {"EXPORT",  MOUNT3_EXPORT,  mnt3svc_export,  NULL, 0, DRC_NA}
 };
 
 
@@ -1923,7 +2617,7 @@ mnt3svc_init (xlator_t *nfsx)
                 }
         }
 
-        rpcsvc_create_listeners (nfs->rpcsvc, options, nfsx->name);
+        ret= rpcsvc_create_listeners (nfs->rpcsvc, options, nfsx->name);
         if (ret == -1) {
                 gf_log (GF_NFS, GF_LOG_ERROR, "Unable to create listeners");
                 dict_unref (options);
@@ -1940,12 +2634,12 @@ err:
 
 
 rpcsvc_actor_t  mnt1svc_actors[MOUNT1_PROC_COUNT] = {
-        {"NULL", MOUNT1_NULL, mnt3svc_null, NULL, 0},
-        {{0, 0}, },
-        {"DUMP", MOUNT1_DUMP, mnt3svc_dump, NULL, 0},
-        {"UMNT", MOUNT1_UMNT, mnt3svc_umnt, NULL, 0},
-        {{0, 0}, },
-        {"EXPORT", MOUNT1_EXPORT, mnt3svc_export, NULL, 0}
+        {"NULL",    MOUNT1_NULL,    mnt3svc_null,   NULL, 0, DRC_NA},
+        {"MNT",     MOUNT1_MNT,     NULL,           NULL, 0, DRC_NA },
+        {"DUMP",    MOUNT1_DUMP,    mnt3svc_dump,   NULL, 0, DRC_NA},
+        {"UMNT",    MOUNT1_UMNT,    mnt3svc_umnt,   NULL, 0, DRC_NA},
+        {"UMNTALL", MOUNT1_UMNTALL, NULL,           NULL, 0, DRC_NA},
+        {"EXPORT",  MOUNT1_EXPORT,  mnt3svc_export, NULL, 0, DRC_NA}
 };
 
 rpcsvc_program_t        mnt1prog = {
@@ -2011,7 +2705,7 @@ mnt1svc_init (xlator_t *nfsx)
                 }
         }
 
-        rpcsvc_create_listeners (nfs->rpcsvc, options, nfsx->name);
+        ret = rpcsvc_create_listeners (nfs->rpcsvc, options, nfsx->name);
         if (ret == -1) {
                 gf_log (GF_NFS, GF_LOG_ERROR, "Unable to create listeners");
                 dict_unref (options);
@@ -2022,3 +2716,44 @@ mnt1svc_init (xlator_t *nfsx)
 err:
         return NULL;
 }
+
+int
+mount_reconfigure_state (xlator_t *nfsx, dict_t *options)
+{
+        int                    ret      = -1;
+        struct nfs_state       *nfs     = NULL;
+        struct mount3_state    *ms      = NULL;
+        struct mnt3_export     *exp     = NULL;
+        struct mnt3_export     *texp  = NULL;
+
+        if ((!nfsx) || (!options))
+                return (-1);
+
+        nfs = (struct nfs_state *)nfs_state (nfsx);
+        if (!nfs)
+                return (-1);
+
+        ms = nfs->mstate;
+        if (!ms)
+                return (-1);
+
+        /*
+         * Free() up the old export list. mnt3_init_options() will
+         * rebuild the export list from scratch. Do it with locking
+         * to avoid unnecessary race conditions.
+         */
+        LOCK (&ms->mountlock);
+        list_for_each_entry_safe (exp, texp, &ms->exportlist, explist) {
+                list_del (&exp->explist);
+                mnt3_export_free (exp);
+        }
+        ret = mnt3_init_options (ms, options);
+        UNLOCK (&ms->mountlock);
+
+        if (ret < 0) {
+                gf_log (GF_MNT, GF_LOG_ERROR, "Options reconfigure failed");
+                return (-1);
+        }
+
+        return (0);
+}
diff --git a/xlators/nfs/server/src/mount3.h b/xlators/nfs/server/src/mount3.h
index c0eae3644..7fc16ed57 100644
--- a/xlators/nfs/server/src/mount3.h
+++ b/xlators/nfs/server/src/mount3.h
@@ -2,19 +2,10 @@
   Copyright (c) 2010-2011 Gluster, Inc. <http://www.gluster.com>
   This file is part of GlusterFS.
 
-  GlusterFS is free software; you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published
-  by the Free Software Foundation; either version 3 of the License,
-  or (at your option) any later version.
-
-  GlusterFS is distributed in the hope that it will be useful, but
-  WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-  General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see
-  <http://www.gnu.org/licenses/>.
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
 */
 
 #ifndef _MOUNT3_H_
@@ -53,6 +44,12 @@ mnt1svc_init (xlator_t *nfsx);
 extern int
 mount_init_state (xlator_t *nfsx);
 
+extern int
+mount_reconfigure_state (xlator_t *nfsx, dict_t *options);
+
+void
+mount_rewrite_rmtab (struct mount3_state *ms, char *new_rmtab);
+
 /* Data structure used to store the list of mounts points currently
  * in use by NFS clients.
  */
@@ -68,6 +65,13 @@ struct mountentry {
 #define MNT3_EXPTYPE_VOLUME     1
 #define MNT3_EXPTYPE_DIR        2
 
+/* Structure to hold export-dir AUTH parameter */
+struct host_auth_spec {
+        char                    *host_addr;    /* Allowed IP or host name */
+        int                     routeprefix;   /* Routing prefix */
+        struct host_auth_spec   *next;         /* Pointer to next AUTH struct */
+};
+
 struct mnt3_export {
         struct list_head        explist;
 
@@ -75,6 +79,11 @@ struct mnt3_export {
          * is exported or the subdirectory in the volume.
          */
         char                    *expname;
+        /*
+         * IP address, hostname or subnets who are allowed to connect to expname
+         * subvolume or subdirectory
+         */
+        struct host_auth_spec*  hostspec;
         xlator_t                *vol;
         int                     exptype;
 
@@ -101,8 +110,8 @@ struct mount3_state {
         gf_lock_t               mountlock;
 
         /* Set to 0 if exporting full volumes is disabled. On by default. */
-        int                     export_volumes;
-        int                     export_dirs;
+        gf_boolean_t            export_volumes;
+        gf_boolean_t            export_dirs;
 };
 
 #define gf_mnt3_export_dirs(mst)        ((mst)->export_dirs)
diff --git a/xlators/nfs/server/src/mount3udp_svc.c b/xlators/nfs/server/src/mount3udp_svc.c
index aa38b1cc4..fb59e282c 100644
--- a/xlators/nfs/server/src/mount3udp_svc.c
+++ b/xlators/nfs/server/src/mount3udp_svc.c
@@ -2,19 +2,10 @@
   Copyright (c) 2012 Gluster, Inc. <http://www.gluster.com>
   This file is part of GlusterFS.
 
-  GlusterFS is free software; you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published
-  by the Free Software Foundation; either version 3 of the License,
-  or (at your option) any later version.
-
-  GlusterFS is distributed in the hope that it will be useful, but
-  WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-  General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see
-  <http://www.gnu.org/licenses/>.
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
 */
 
 
diff --git a/xlators/nfs/server/src/nfs-common.c b/xlators/nfs/server/src/nfs-common.c
index b3853ded5..f74396ee8 100644
--- a/xlators/nfs/server/src/nfs-common.c
+++ b/xlators/nfs/server/src/nfs-common.c
@@ -2,19 +2,10 @@
   Copyright (c) 2010-2011 Gluster, Inc. <http://www.gluster.com>
   This file is part of GlusterFS.
 
-  GlusterFS is free software; you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published
-  by the Free Software Foundation; either version 3 of the License,
-  or (at your option) any later version.
-
-  GlusterFS is distributed in the hope that it will be useful, but
-  WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-  General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see
-  <http://www.gnu.org/licenses/>.
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
 */
 
 #ifndef _CONFIG_H
@@ -94,7 +85,7 @@ nfs_mntpath_to_xlator (xlator_list_t *cl, char *path)
         if ((!cl) || (!path))
                 return NULL;
 
-        strcpy (volname, path);
+        strncpy (volname, path, MNTPATHLEN);
         pathlen = strlen (volname);
         gf_log (GF_NFS, GF_LOG_TRACE, "Subvolume search: %s", path);
         if (volname[0] == '/')
diff --git a/xlators/nfs/server/src/nfs-common.h b/xlators/nfs/server/src/nfs-common.h
index f74bb3187..2e97f1563 100644
--- a/xlators/nfs/server/src/nfs-common.h
+++ b/xlators/nfs/server/src/nfs-common.h
@@ -2,19 +2,10 @@
   Copyright (c) 2010-2011 Gluster, Inc. <http://www.gluster.com>
   This file is part of GlusterFS.
 
-  GlusterFS is free software; you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published
-  by the Free Software Foundation; either version 3 of the License,
-  or (at your option) any later version.
-
-  GlusterFS is distributed in the hope that it will be useful, but
-  WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-  General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see
-  <http://www.gnu.org/licenses/>.
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
 */
 
 #ifndef _NFS_COMMON_H_
diff --git a/xlators/nfs/server/src/nfs-fops.c b/xlators/nfs/server/src/nfs-fops.c
index df09d22bb..236b80c76 100644
--- a/xlators/nfs/server/src/nfs-fops.c
+++ b/xlators/nfs/server/src/nfs-fops.c
@@ -2,19 +2,10 @@
   Copyright (c) 2010-2011 Gluster, Inc. <http://www.gluster.com>
   This file is part of GlusterFS.
 
-  GlusterFS is free software; you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published
-  by the Free Software Foundation; either version 3 of the License,
-  or (at your option) any later version.
-
-  GlusterFS is distributed in the hope that it will be useful, but
-  WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-  General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see
-  <http://www.gnu.org/licenses/>.
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
 */
 
 #ifndef _CONFIG_H
@@ -191,6 +182,12 @@ nfs_create_frame (xlator_t *xl, nfs_user_t *nfu)
         frame = create_frame (xl, (call_pool_t *)xl->ctx->pool);
         if (!frame)
                 goto err;
+	if (call_stack_alloc_groups (frame->root, nfu->ngrps) != 0) {
+		STACK_DESTROY (frame->root);
+		frame = NULL;
+		goto err;
+	}
+
         frame->root->pid = NFS_PID;
         frame->root->uid = nfu->uid;
         frame->root->gid = nfu->gids[NFS_PRIMGID_IDX];
@@ -385,19 +382,6 @@ nfs_fop_lookup_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
 {
         struct nfs_fop_local    *local = NULL;
         fop_lookup_cbk_t        progcbk;
-        char                    *sh_fail_val = NULL;
-
-        /*
-         * With native protocol, self-heal failures would be detected during
-         * open.  NFS doesn't issue that open when revalidating cache, so we
-         * have to check for failures here instead.
-         */
-        if (dict_get_str(xattr,"sh-failed",&sh_fail_val) == 0) {
-                if (strcmp(sh_fail_val,"1") == 0) {
-                        op_ret = -1;
-                        op_errno = EIO;
-                }
-        }
 
         if (op_ret == 0) {
                 nfs_fix_generation(this,inode);
@@ -1379,7 +1363,7 @@ nfs_fop_write (xlator_t *nfsx, xlator_t *xl, nfs_user_t *nfu, fd_t *fd,
         iobref_add (nfl->iobref, srciob);
 */
         STACK_WIND_COOKIE (frame, nfs_fop_writev_cbk, xl, xl,xl->fops->writev,
-                           fd, vector, count, offset, 0, srciobref, NULL);
+                           fd, vector, count, offset, fd->flags, srciobref, NULL);
         ret = 0;
 err:
         if (ret < 0) {
diff --git a/xlators/nfs/server/src/nfs-fops.h b/xlators/nfs/server/src/nfs-fops.h
index d846e14de..44e99c66b 100644
--- a/xlators/nfs/server/src/nfs-fops.h
+++ b/xlators/nfs/server/src/nfs-fops.h
@@ -2,19 +2,10 @@
   Copyright (c) 2010-2011 Gluster, Inc. <http://www.gluster.com>
   This file is part of GlusterFS.
 
-  GlusterFS is free software; you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published
-  by the Free Software Foundation; either version 3 of the License,
-  or (at your option) any later version.
-
-  GlusterFS is distributed in the hope that it will be useful, but
-  WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-  General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see
-  <http://www.gnu.org/licenses/>.
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
 */
 
 #ifndef _NFS_FOPS_H_
diff --git a/xlators/nfs/server/src/nfs-generics.c b/xlators/nfs/server/src/nfs-generics.c
index 7f79bba9b..cb32b7f1b 100644
--- a/xlators/nfs/server/src/nfs-generics.c
+++ b/xlators/nfs/server/src/nfs-generics.c
@@ -2,19 +2,10 @@
   Copyright (c) 2010-2011 Gluster, Inc. <http://www.gluster.com>
   This file is part of GlusterFS.
 
-  GlusterFS is free software; you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published
-  by the Free Software Foundation; either version 3 of the License,
-  or (at your option) any later version.
-
-  GlusterFS is distributed in the hope that it will be useful, but
-  WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-  General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see
-  <http://www.gnu.org/licenses/>.
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
 */
 
 #ifndef _CONFIG_H
diff --git a/xlators/nfs/server/src/nfs-generics.h b/xlators/nfs/server/src/nfs-generics.h
index 34e203a62..01876d68e 100644
--- a/xlators/nfs/server/src/nfs-generics.h
+++ b/xlators/nfs/server/src/nfs-generics.h
@@ -2,19 +2,10 @@
   Copyright (c) 2010-2011 Gluster, Inc. <http://www.gluster.com>
   This file is part of GlusterFS.
 
-  GlusterFS is free software; you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published
-  by the Free Software Foundation; either version 3 of the License,
-  or (at your option) any later version.
-
-  GlusterFS is distributed in the hope that it will be useful, but
-  WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-  General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see
-  <http://www.gnu.org/licenses/>.
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
 */
 
 #ifndef _NFS_GENERICS_H_
diff --git a/xlators/nfs/server/src/nfs-inodes.c b/xlators/nfs/server/src/nfs-inodes.c
index a68f8b227..63d5e8a19 100644
--- a/xlators/nfs/server/src/nfs-inodes.c
+++ b/xlators/nfs/server/src/nfs-inodes.c
@@ -2,19 +2,10 @@
   Copyright (c) 2010-2011 Gluster, Inc. <http://www.gluster.com>
   This file is part of GlusterFS.
 
-  GlusterFS is free software; you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published
-  by the Free Software Foundation; either version 3 of the License,
-  or (at your option) any later version.
-
-  GlusterFS is distributed in the hope that it will be useful, but
-  WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-  General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see
-  <http://www.gnu.org/licenses/>.
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
 */
 
 #ifndef _CONFIG_H
@@ -57,10 +48,10 @@ nfl_inodes_init (struct nfs_fop_local *nfl, inode_t *inode, inode_t *parent,
                 nfl->newparent = inode_ref (newparent);
 
         if (name)
-                strcpy (nfl->path, name);
+                strncpy (nfl->path, name, NFS_NAME_MAX);
 
         if (newname)
-                strcpy (nfl->newpath, newname);
+                strncpy (nfl->newpath, newname, NFS_NAME_MAX);
 
         return;
 }
@@ -572,9 +563,7 @@ nfs_inode_opendir_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
         struct nfs_fop_local    *nfl = NULL;
         fop_open_cbk_t          progcbk = NULL;
 
-        if ((op_ret == -1) && (fd))
-                fd_unref (fd);
-        else
+        if (op_ret != -1)
                 fd_bind (fd);
 
         inodes_nfl_to_prog_data (nfl, progcbk, frame);
diff --git a/xlators/nfs/server/src/nfs-inodes.h b/xlators/nfs/server/src/nfs-inodes.h
index 7c962b339..ba7a57124 100644
--- a/xlators/nfs/server/src/nfs-inodes.h
+++ b/xlators/nfs/server/src/nfs-inodes.h
@@ -2,19 +2,10 @@
   Copyright (c) 2010-2011 Gluster, Inc. <http://www.gluster.com>
   This file is part of GlusterFS.
 
-  GlusterFS is free software; you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published
-  by the Free Software Foundation; either version 3 of the License,
-  or (at your option) any later version.
-
-  GlusterFS is distributed in the hope that it will be useful, but
-  WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-  General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see
-  <http://www.gnu.org/licenses/>.
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
 */
 
 #ifndef _NFS_INODES_H_
diff --git a/xlators/nfs/server/src/nfs-mem-types.h b/xlators/nfs/server/src/nfs-mem-types.h
index 005598c1f..450b6f2fe 100644
--- a/xlators/nfs/server/src/nfs-mem-types.h
+++ b/xlators/nfs/server/src/nfs-mem-types.h
@@ -2,19 +2,10 @@
    Copyright (c) 2008-2011 Gluster, Inc. <http://www.gluster.com>
    This file is part of GlusterFS.
 
-   GlusterFS is free software; you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published
-   by the Free Software Foundation; either version 3 of the License,
-   or (at your option) any later version.
-
-   GlusterFS is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program.  If not, see
-   <http://www.gnu.org/licenses/>.
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
 */
 
 
@@ -54,6 +45,8 @@ enum gf_nfs_mem_types_ {
         gf_nfs_mt_nlm4_share,
         gf_nfs_mt_aux_gids,
         gf_nfs_mt_inode_ctx,
+        gf_nfs_mt_auth_spec,
+        gf_nfs_mt_arr,
         gf_nfs_mt_end
 };
 #endif
diff --git a/xlators/nfs/server/src/nfs.c b/xlators/nfs/server/src/nfs.c
index 466393e34..75c8fe44e 100644
--- a/xlators/nfs/server/src/nfs.c
+++ b/xlators/nfs/server/src/nfs.c
@@ -2,19 +2,10 @@
   Copyright (c) 2010-2011 Gluster, Inc. <http://www.gluster.com>
   This file is part of GlusterFS.
 
-  GlusterFS is free software; you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published
-  by the Free Software Foundation; either version 3 of the License,
-  or (at your option) any later version.
-
-  GlusterFS is distributed in the hope that it will be useful, but
-  WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-  General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see
-  <http://www.gnu.org/licenses/>.
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
 */
 
 /* This is the primary translator source for NFS.
@@ -43,10 +34,206 @@
 #include "nlm4.h"
 #include "options.h"
 #include "acl3.h"
+#include "rpc-drc.h"
+
+#define STRINGIFY(val) #val
+#define TOSTRING(val) STRINGIFY(val)
 
 #define OPT_SERVER_AUX_GIDS             "nfs.server-aux-gids"
 #define OPT_SERVER_GID_CACHE_TIMEOUT    "nfs.server.aux-gid-timeout"
 
+/* TODO: DATADIR should be based on configure's $(localstatedir) */
+#define DATADIR                         "/var/lib/glusterd"
+#define NFS_DATADIR                     DATADIR "/nfs"
+
+/* Forward declaration */
+int nfs_add_initer (struct list_head *list, nfs_version_initer_t init);
+
+static int
+nfs_init_version (xlator_t *this, nfs_version_initer_t init)
+{
+        int                       ret       = -1;
+        struct nfs_initer_list    *version  = NULL;
+        struct nfs_initer_list    *tmp      = NULL;
+        rpcsvc_program_t          *prog     = NULL;
+        struct list_head          *versions = NULL;
+        struct nfs_state          *nfs      = NULL;
+        gf_boolean_t              found     = _gf_false;
+
+        if ((!this) || (!this->private) || (!init))
+                return (-1);
+
+        nfs = (struct nfs_state *)this->private;
+
+        ret = nfs_add_initer (&nfs->versions, init);
+        if (ret == -1) {
+                gf_log (GF_NFS, GF_LOG_ERROR,
+                                "Failed to add protocol initializer");
+                goto err;
+        }
+
+        versions = &nfs->versions;
+        list_for_each_entry_safe (version, tmp, versions, list) {
+                prog = version->program;
+                if (version->init == init) {
+                        prog = init(this);
+                        if (!prog) {
+                                ret = -1;
+                                goto err;
+                        }
+                        version->program = prog;
+                        found = _gf_true;
+                        break;
+                }
+        }
+
+        /* program not added */
+        if (!found) {
+                gf_log (GF_NFS, GF_LOG_ERROR,
+                                "Program: %s NOT found", prog->progname);
+                goto err;
+        }
+
+        /* Check if nfs.port is configured */
+        if (nfs->override_portnum)
+                prog->progport = nfs->override_portnum;
+
+        gf_log (GF_NFS, GF_LOG_DEBUG, "Starting program: %s", prog->progname);
+
+        ret = rpcsvc_program_register (nfs->rpcsvc, prog);
+        if (ret == -1) {
+                gf_log (GF_NFS, GF_LOG_ERROR, "Program: %s init failed",
+                                                      prog->progname);
+                goto err;
+        }
+
+        /* Registration with portmapper is disabled, Nothing to do */
+        if (!nfs->register_portmap)
+                goto err;
+
+        ret = rpcsvc_program_register_portmap (prog, prog->progport);
+        if (ret == -1) {
+                gf_log (GF_NFS, GF_LOG_ERROR,
+                                "Program  %s registration failed",
+                                prog->progname);
+                goto err;
+        }
+        ret = 0; /* All well */
+err:
+        return ret;
+}
+
+static int
+nfs_deinit_version (struct nfs_state *nfs, nfs_version_initer_t init)
+{
+        int                       ret       = -1;
+        struct nfs_initer_list    *version  = NULL;
+        struct nfs_initer_list    *tmp      = NULL;
+        rpcsvc_program_t          *prog     = NULL;
+        struct list_head          *versions = NULL;
+
+        if ((!nfs) || (!init))
+                return (-1);
+
+        versions = &nfs->versions;
+        list_for_each_entry_safe (version, tmp, versions, list) {
+                prog = version->program;
+                if (version->init == init) {
+                        prog = version->program;
+                        ret = rpcsvc_program_unregister (nfs->rpcsvc, prog);
+                        if (ret != 0)
+                                return (-1);
+                        list_del (&version->list);
+                        GF_FREE (version);
+                        return (0);
+                }
+        }
+
+        return (-1);
+}
+
+static int
+nfs_reconfigure_acl3 (xlator_t *this)
+{
+        struct nfs_state          *nfs     = NULL;
+
+        if ((!this) || (!this->private))
+                return (-1);
+
+        nfs = (struct nfs_state *)this->private;
+
+        /* ACL is enabled */
+        if (nfs->enable_acl)
+                return nfs_init_version (this, acl3svc_init);
+
+        /* ACL is disabled */
+        return nfs_deinit_version (nfs, acl3svc_init);
+}
+
+static int
+nfs_reconfigure_nlm4 (xlator_t *this)
+{
+        struct nfs_state          *nfs     = NULL;
+
+        if ((!this) || (!this->private))
+                return (-1);
+
+        nfs = (struct nfs_state *)this->private;
+
+        /* NLM is enabled */
+        if (nfs->enable_nlm)
+                return nfs_init_version (this, nlm4svc_init);
+
+        /* NLM is disabled */
+        return nfs_deinit_version (nfs, nlm4svc_init);
+}
+
+static int
+nfs_program_register_portmap_all (struct nfs_state *nfs)
+{
+        struct list_head                *versions = NULL;
+        struct nfs_initer_list          *version = NULL;
+        struct nfs_initer_list          *tmp = NULL;
+        rpcsvc_program_t                *prog = NULL;
+
+        if (nfs == NULL)
+                return (-1);
+
+        versions = &nfs->versions;
+        list_for_each_entry_safe (version, tmp, versions, list) {
+                prog = version->program;
+                if (prog == NULL)
+                        continue;
+                if (nfs->override_portnum)
+                        prog->progport = nfs->override_portnum;
+                (void) rpcsvc_program_register_portmap (prog, prog->progport);
+        }
+
+        return (0);
+}
+
+static int
+nfs_program_unregister_portmap_all (struct nfs_state *nfs)
+{
+        struct list_head                *versions = NULL;
+        struct nfs_initer_list          *version = NULL;
+        struct nfs_initer_list          *tmp = NULL;
+        rpcsvc_program_t                *prog = NULL;
+
+        if (nfs == NULL)
+                return (-1);
+
+        versions = &nfs->versions;
+        list_for_each_entry_safe (version, tmp, versions, list) {
+                prog = version->program;
+                if (prog == NULL)
+                        continue;
+                (void) rpcsvc_program_unregister_portmap (prog);
+        }
+
+        return (0);
+}
+
 /* Every NFS version must call this function with the init function
  * for its particular version.
  */
@@ -123,7 +310,7 @@ nfs_init_versions (struct nfs_state *nfs, xlator_t *this)
                         ret = -1;
                         goto err;
                 }
-//                prog->actorxl = this;
+
                 version->program = prog;
                 if (nfs->override_portnum)
                         prog->progport = nfs->override_portnum;
@@ -132,17 +319,21 @@ nfs_init_versions (struct nfs_state *nfs, xlator_t *this)
 
                 ret = rpcsvc_program_register (nfs->rpcsvc, prog);
                 if (ret == -1) {
-                        gf_log (GF_NFS, GF_LOG_ERROR, "Program init failed");
+                        gf_log (GF_NFS, GF_LOG_ERROR, "Program: %s init failed",
+                                                      prog->progname);
                         goto err;
                 }
-                if (rpcsvc_register_portmap_enabled(nfs->rpcsvc)) {
+                if (nfs->register_portmap) {
                         ret = rpcsvc_program_register_portmap (prog,
                                                                prog->progport);
                         if (ret == -1) {
-                                gf_log (GF_NFS, GF_LOG_ERROR, "Program registration failed");
+                                gf_log (GF_NFS, GF_LOG_ERROR,
+                                        "Program  %s registration failed",
+                                        prog->progname);
                                 goto err;
                         }
                 }
+
         }
 
         ret = 0;
@@ -159,22 +350,22 @@ nfs_add_all_initiators (struct nfs_state *nfs)
         /* Add the initializers for all versions. */
         ret = nfs_add_initer (&nfs->versions, mnt3svc_init);
         if (ret == -1) {
-                gf_log (GF_NFS, GF_LOG_ERROR, "Failed to add protocol"
-                        " initializer");
+                gf_log (GF_NFS, GF_LOG_ERROR, "Failed to add "
+                                "MOUNT3 protocol initializer");
                 goto ret;
         }
 
         ret = nfs_add_initer (&nfs->versions, mnt1svc_init);
         if (ret == -1) {
-                gf_log (GF_NFS, GF_LOG_ERROR, "Failed to add protocol"
-                        " initializer");
+                gf_log (GF_NFS, GF_LOG_ERROR, "Failed to add "
+                                "MOUNT1 protocol initializer");
                 goto ret;
         }
 
         ret = nfs_add_initer (&nfs->versions, nfs3svc_init);
         if (ret == -1) {
-                gf_log (GF_NFS, GF_LOG_ERROR, "Failed to add protocol"
-                        " initializer");
+                gf_log (GF_NFS, GF_LOG_ERROR, "Failed to add "
+                                "NFS3 protocol initializer");
                 goto ret;
         }
 
@@ -187,11 +378,13 @@ nfs_add_all_initiators (struct nfs_state *nfs)
                 }
         }
 
-        ret = nfs_add_initer (&nfs->versions, acl3svc_init);
-        if (ret == -1) {
-                gf_log (GF_NFS, GF_LOG_ERROR, "Failed to add protocol"
-                        " initializer");
-                goto ret;
+        if (nfs->enable_acl == _gf_true) {
+                ret = nfs_add_initer (&nfs->versions, acl3svc_init);
+                if (ret == -1) {
+                        gf_log (GF_NFS, GF_LOG_ERROR, "Failed to add "
+                                "ACL protocol initializer");
+                        goto ret;
+                }
         }
 
         ret = 0;
@@ -527,10 +720,11 @@ nfs_init_state (xlator_t *this)
         if (!this)
                 return NULL;
 
-        if ((!this->children) || (!this->children->xlator)) {
-                gf_log (GF_NFS, GF_LOG_ERROR, "nfs must have at least one"
-                        " child subvolume");
-                return NULL;
+        if (!this->children) {
+                gf_log (GF_NFS, GF_LOG_INFO,
+                        "NFS is manually disabled: Exiting");
+                /* Nothing for nfs process to do, exit cleanly */
+                kill (getpid (), SIGTERM);
         }
 
         nfs = GF_CALLOC (1, sizeof (*nfs), gf_nfs_mt_nfs_state);
@@ -586,19 +780,17 @@ nfs_init_state (xlator_t *this)
         }
 
         nfs->enable_nlm = _gf_true;
-        if (!dict_get_str (this->options, "nfs.nlm", &optstr)) {
-
-                ret = gf_string2boolean (optstr, &boolt);
-                if (ret < 0) {
-                        gf_log (GF_NFS, GF_LOG_ERROR, "Failed to parse"
-                                " bool string");
-                        goto free_foppool;
-                }
+        ret = dict_get_str_boolean (this->options, "nfs.nlm", _gf_true);
+        if (ret == _gf_false) {
+                gf_log (GF_NFS, GF_LOG_INFO, "NLM is manually disabled");
+                nfs->enable_nlm = _gf_false;
+        }
 
-                if (boolt == _gf_false) {
-                        gf_log (GF_NFS, GF_LOG_INFO, "NLM is manually disabled");
-                        nfs->enable_nlm = _gf_false;
-                }
+        nfs->enable_acl = _gf_true;
+        ret = dict_get_str_boolean (this->options, "nfs.acl", _gf_true);
+        if (ret == _gf_false) {
+                gf_log (GF_NFS, GF_LOG_INFO, "ACL is manually disabled");
+                nfs->enable_acl = _gf_false;
         }
 
         nfs->enable_ino32 = 0;
@@ -682,6 +874,15 @@ nfs_init_state (xlator_t *this)
                         nfs->mount_udp = 1;
         }
 
+        nfs->rmtab = gf_strdup (NFS_DATADIR "/rmtab");
+        if (dict_get(this->options, "nfs.mount-rmtab")) {
+                ret = dict_get_str (this->options, "nfs.mount-rmtab", &nfs->rmtab);
+                if (ret == -1) {
+                        gf_log (GF_NFS, GF_LOG_ERROR, "Failed to parse dict");
+                        goto free_foppool;
+                }
+        }
+
         /* support both options rpc-auth.ports.insecure and
          * rpc-auth-allow-insecure for backward compatibility
          */
@@ -747,10 +948,10 @@ nfs_init_state (xlator_t *this)
         GF_OPTION_INIT (OPT_SERVER_GID_CACHE_TIMEOUT, nfs->server_aux_gids_max_age,
                         uint32, free_foppool);
 
-	if (gid_cache_init(&nfs->gid_cache, nfs->server_aux_gids_max_age) < 0) {
-		gf_log(GF_NFS, GF_LOG_ERROR, "Failed to initialize group cache.");
-		goto free_foppool;
-	}
+        if (gid_cache_init(&nfs->gid_cache, nfs->server_aux_gids_max_age) < 0) {
+                gf_log(GF_NFS, GF_LOG_ERROR, "Failed to initialize group cache.");
+                goto free_foppool;
+        }
 
         if (stat("/sbin/rpc.statd", &stbuf) == -1) {
                 gf_log (GF_NFS, GF_LOG_WARNING, "/sbin/rpc.statd not found. "
@@ -765,6 +966,8 @@ nfs_init_state (xlator_t *this)
                 goto free_foppool;
         }
 
+        nfs->register_portmap = rpcsvc_register_portmap_enabled (nfs->rpcsvc);
+
         this->private = (void *)nfs;
         INIT_LIST_HEAD (&nfs->versions);
         nfs->generation = 1965;
@@ -786,6 +989,243 @@ free_rpcsvc:
         return nfs;
 }
 
+int
+nfs_drc_init (xlator_t *this)
+{
+        int       ret     = -1;
+        rpcsvc_t *svc     = NULL;
+
+        svc = ((struct nfs_state *)(this->private))->rpcsvc;
+        if (!svc)
+                goto out;
+
+        ret = rpcsvc_drc_init (svc, this->options);
+
+ out:
+        return ret;
+}
+
+int
+nfs_reconfigure_state (xlator_t *this, dict_t *options)
+{
+        int                 ret = 0;
+        int                 keyindx = 0;
+        char                *optstr = NULL;
+        gf_boolean_t        optbool;
+        uint32_t            optuint32;
+        struct nfs_state    *nfs = NULL;
+        char                *blacklist_keys[] = {
+                                        "nfs.port",
+                                        "nfs.transport-type",
+                                        "nfs.mem-factor",
+                                        NULL};
+
+        GF_VALIDATE_OR_GOTO (GF_NFS, this, out);
+        GF_VALIDATE_OR_GOTO (GF_NFS, this->private, out);
+        GF_VALIDATE_OR_GOTO (GF_NFS, options, out);
+
+        nfs = (struct nfs_state *)this->private;
+
+        /* Black listed options can't be reconfigured, they need
+         * NFS to be restarted. There are two cases 1. SET 2. UNSET.
+         * 1. SET */
+        while (blacklist_keys[keyindx]) {
+                if (dict_get (options, blacklist_keys[keyindx])) {
+                        gf_log (GF_NFS, GF_LOG_ERROR,
+                                "Reconfiguring %s needs NFS restart",
+                                blacklist_keys[keyindx]);
+                        goto out;
+                }
+                keyindx ++;
+        }
+
+        /* UNSET for nfs.mem-factor */
+        if ((!dict_get (options, "nfs.mem-factor")) &&
+            (nfs->memfactor != GF_NFS_DEFAULT_MEMFACTOR)) {
+                gf_log (GF_NFS, GF_LOG_INFO,
+                        "Reconfiguring nfs.mem-factor needs NFS restart");
+                goto out;
+        }
+
+        /* UNSET for nfs.port */
+        if ((!dict_get (options, "nfs.port")) &&
+            (nfs->override_portnum)) {
+                gf_log (GF_NFS, GF_LOG_ERROR,
+                        "Reconfiguring nfs.port needs NFS restart");
+                goto out;
+        }
+
+        /* reconfig nfs.mount-rmtab */
+        optstr = NFS_DATADIR "/rmtab";
+        if (dict_get (options, "nfs.mount-rmtab")) {
+                ret = dict_get_str (options, "nfs.mount-rmtab", &optstr);
+                if (ret < 0) {
+                        gf_log (GF_NFS, GF_LOG_ERROR, "Failed to read "
+                                "reconfigured option: nfs.mount-rmtab");
+                        goto out;
+                }
+                gf_path_strip_trailing_slashes (optstr);
+        }
+        if (strcmp (nfs->rmtab, optstr) != 0) {
+                mount_rewrite_rmtab (nfs->mstate, optstr);
+                gf_log (GF_NFS, GF_LOG_INFO,
+                                "Reconfigured nfs.mount-rmtab path: %s",
+                                nfs->rmtab);
+        }
+
+        GF_OPTION_RECONF (OPT_SERVER_AUX_GIDS, optbool,
+                                               options, bool, out);
+        if (nfs->server_aux_gids != optbool) {
+                nfs->server_aux_gids = optbool;
+                gf_log(GF_NFS, GF_LOG_INFO, "Reconfigured %s with value %d",
+                               OPT_SERVER_AUX_GIDS, optbool);
+        }
+
+        GF_OPTION_RECONF (OPT_SERVER_GID_CACHE_TIMEOUT, optuint32,
+                                               options, uint32, out);
+        if (nfs->server_aux_gids_max_age != optuint32) {
+                nfs->server_aux_gids_max_age = optuint32;
+                gid_cache_reconf (&nfs->gid_cache, optuint32);
+                gf_log(GF_NFS, GF_LOG_INFO, "Reconfigured %s with value %d",
+                               OPT_SERVER_GID_CACHE_TIMEOUT, optuint32);
+        }
+
+        /* reconfig nfs.dynamic-volumes */
+        ret = dict_get_str_boolean (options, "nfs.dynamic-volumes",
+                                             GF_NFS_DVM_OFF);
+        switch (ret) {
+        case GF_NFS_DVM_ON:
+        case GF_NFS_DVM_OFF:
+                optbool = ret;
+                break;
+        default:
+                optbool = GF_NFS_DVM_OFF;
+                break;
+        }
+        if (nfs->dynamicvolumes != optbool) {
+                nfs->dynamicvolumes = optbool;
+                gf_log(GF_NFS, GF_LOG_INFO, "Reconfigured nfs.dynamic-volumes"
+                                            " with value %d", optbool);
+        }
+
+        optbool = _gf_false;
+        if (dict_get (options, "nfs.enable-ino32")) {
+                ret = dict_get_str_boolean (options, "nfs.enable-ino32",
+                                                      _gf_false);
+                if (ret < 0) {
+                        gf_log (GF_NFS, GF_LOG_ERROR,
+                                "Failed to read reconfigured option: "
+                                "nfs.enable-ino32");
+                        goto out;
+                }
+                optbool = ret;
+        }
+        if (nfs->enable_ino32 != optbool) {
+                nfs->enable_ino32 = optbool;
+                gf_log(GF_NFS, GF_LOG_INFO, "Reconfigured nfs.enable-ino32"
+                                            " with value %d", optbool);
+        }
+
+        /* nfs.nlm is enabled by default */
+        ret = dict_get_str_boolean (options, "nfs.nlm", _gf_true);
+        if (ret < 0) {
+                optbool = _gf_true;
+        } else {
+                optbool = ret;
+        }
+        if (nfs->enable_nlm != optbool) {
+                gf_log (GF_NFS, GF_LOG_INFO, "NLM is manually %s",
+                                (optbool ? "enabled":"disabled"));
+                nfs->enable_nlm = optbool;
+                nfs_reconfigure_nlm4 (this);
+        }
+
+        /* nfs.acl is enabled by default */
+        ret = dict_get_str_boolean (options, "nfs.acl", _gf_true);
+        if (ret < 0) {
+                optbool = _gf_true;
+        } else {
+                optbool = ret;
+        }
+        if (nfs->enable_acl != optbool) {
+                gf_log (GF_NFS, GF_LOG_INFO, "ACL is manually %s",
+                                (optbool ? "enabled":"disabled"));
+                nfs->enable_acl = optbool;
+                nfs_reconfigure_acl3 (this);
+        }
+
+        ret = 0;
+out:
+        return ret;
+}
+
+
+/*
+ * reconfigure() for NFS server xlator.
+ */
+int
+reconfigure (xlator_t *this, dict_t *options)
+{
+        int                      ret = 0;
+        struct nfs_state         *nfs = NULL;
+        gf_boolean_t             regpmap = _gf_true;
+
+        if ((!this) || (!this->private) || (!options))
+                return (-1);
+
+        nfs = (struct nfs_state *)this->private;
+
+        /* Reconfigure nfs options */
+        ret = nfs_reconfigure_state(this, options);
+        if (ret) {
+                gf_log (GF_NFS, GF_LOG_ERROR,
+                        "nfs reconfigure state failed");
+                return (-1);
+        }
+
+        /* Reconfigure nfs3 options */
+        ret = nfs3_reconfigure_state(this, options);
+        if (ret) {
+                gf_log (GF_NFS, GF_LOG_ERROR,
+                        "nfs3 reconfigure state failed");
+                return (-1);
+        }
+
+        /* Reconfigure mount options */
+        ret = mount_reconfigure_state(this, options);
+        if (ret) {
+                gf_log (GF_NFS, GF_LOG_ERROR,
+                        "mount reconfigure state failed");
+                return (-1);
+        }
+
+        /* Reconfigure rpc layer */
+        ret = rpcsvc_reconfigure_options (nfs->rpcsvc, options);
+        if (ret) {
+                gf_log (GF_NFS, GF_LOG_ERROR,
+                        "rpcsvc reconfigure options failed");
+                return (-1);
+        }
+        regpmap = rpcsvc_register_portmap_enabled(nfs->rpcsvc);
+        if (nfs->register_portmap != regpmap) {
+                nfs->register_portmap = regpmap;
+                if (regpmap) {
+                        (void) nfs_program_register_portmap_all (nfs);
+                } else {
+                        (void) nfs_program_unregister_portmap_all (nfs);
+                }
+        }
+
+        /* Reconfigure drc */
+        ret = rpcsvc_drc_reconfigure (nfs->rpcsvc, options);
+        if (ret) {
+                gf_log (GF_NFS, GF_LOG_ERROR,
+                        "rpcsvc DRC reconfigure failed");
+                return (-1);
+        }
+
+        return (0);
+}
 
 int
 init (xlator_t *this) {
@@ -841,7 +1281,9 @@ init (xlator_t *this) {
                 goto err;
         }
 
-        gf_log (GF_NFS, GF_LOG_INFO, "NFS service started");
+        ret = nfs_drc_init (this);
+        if (ret == 0)
+                gf_log (GF_NFS, GF_LOG_INFO, "NFS service started");
 err:
 
         return ret;
@@ -996,7 +1438,22 @@ nlm_priv (xlator_t *this);
 int32_t
 nfs_priv (xlator_t *this)
 {
-        return nlm_priv (this);
+        int32_t ret = -1;
+
+        /* DRC needs the global drc structure, xl is of no use to it. */
+        ret = rpcsvc_drc_priv (((struct nfs_state *)(this->private))->rpcsvc->drc);
+        if (ret) {
+                gf_log (this->name, GF_LOG_DEBUG, "Statedump of DRC failed");
+                goto out;
+        }
+
+        ret = nlm_priv (this);
+        if (ret) {
+                gf_log (this->name, GF_LOG_DEBUG, "Statedump of NLM failed");
+                goto out;
+        }
+ out:
+        return ret;
 }
 
 
@@ -1019,29 +1476,53 @@ struct xlator_dumpops dumpops = {
 struct volume_options options[] = {
         { .key  = {"nfs3.read-size"},
           .type = GF_OPTION_TYPE_SIZET,
-          .description = "Size in which the client should issue read requests"
-                         " to the Gluster NFSv3 server. Must be a multiple of"
-                         " 4KB."
+          .min  = GF_NFS3_RTMIN,
+          .max  = GF_NFS3_RTMAX,
+          .default_value = TOSTRING(GF_NFS3_RTPREF),
+          .description = "Size in which the client should issue read requests "
+                         "to the Gluster NFSv3 server. Must be a multiple of "
+                         "4KB (4096). Min and Max supported values are 4KB "
+                         "(4096) and 1MB (1048576) respectively. If the "
+                         "specified value is within the supported range but "
+                         "not a multiple of 4096, it is rounded up to the "
+                         "nearest multiple of 4096."
         },
         { .key  = {"nfs3.write-size"},
           .type = GF_OPTION_TYPE_SIZET,
-          .description = "Size in which the client should issue write requests"
-                         " to the Gluster NFSv3 server. Must be a multiple of"
-                         " 4KB."
+          .min  = GF_NFS3_WTMIN,
+          .max  = GF_NFS3_WTMAX,
+          .default_value = TOSTRING(GF_NFS3_WTPREF),
+          .description = "Size in which the client should issue write requests "
+                         "to the Gluster NFSv3 server. Must be a multiple of "
+                         "1KB (1024). Min and Max supported values are "
+                         "4KB (4096) and 1MB(1048576) respectively. If the "
+                         "specified value is within the supported range but "
+                         "not a multiple of 4096, it is rounded up to the "
+                         "nearest multiple of 4096."
         },
         { .key  = {"nfs3.readdir-size"},
           .type = GF_OPTION_TYPE_SIZET,
+          .min  = GF_NFS3_DTMIN,
+          .max  = GF_NFS3_DTMAX,
+          .default_value = TOSTRING(GF_NFS3_DTPREF),
           .description = "Size in which the client should issue directory "
-                         " reading requests."
+                         "reading requests to the Gluster NFSv3 server. Must "
+                         "be a multiple of 1KB (1024). Min and Max supported "
+                         "values are 4KB (4096) and 1MB (1048576) respectively."
+                         "If the specified value is within the supported range "
+                         "but not a multiple of 4096, it is rounded up to the "
+                         "nearest multiple of 4096."
         },
         { .key  = {"nfs3.*.volume-access"},
           .type = GF_OPTION_TYPE_STR,
           .value = {"read-only", "read-write"},
+          .default_value = "read-write",
           .description = "Type of access desired for this subvolume: "
                          " read-only, read-write(default)"
         },
         { .key  = {"nfs3.*.trusted-write"},
           .type = GF_OPTION_TYPE_BOOL,
+          .default_value = "off",
           .description = "On an UNSTABLE write from client, return STABLE flag"
                          " to force client to not send a COMMIT request. In "
                          "some environments, combined with a replicated "
@@ -1056,6 +1537,7 @@ struct volume_options options[] = {
         },
         { .key  = {"nfs3.*.trusted-sync"},
           .type = GF_OPTION_TYPE_BOOL,
+          .default_value = "off",
           .description = "All writes and COMMIT requests are treated as async."
                          " This implies that no write requests are guaranteed"
                          " to be on server disks when the write reply is "
@@ -1065,25 +1547,40 @@ struct volume_options options[] = {
         },
         { .key  = {"nfs3.*.export-dir"},
           .type = GF_OPTION_TYPE_PATH,
+          .default_value = "",
           .description = "By default, all subvolumes of nfs are exported as "
                          "individual exports. There are cases where a "
                          "subdirectory or subdirectories in the volume need to "
                          "be exported separately. This option can also be used "
                          "in conjunction with nfs3.export-volumes option to "
                          "restrict exports only to the subdirectories specified"
-                         " through this option. Must be an absolute path."
+                         " through this option. Must be an absolute path. Along"
+                         " with path allowed list of IPs/hostname can be "
+                         "associated with each subdirectory. If provided "
+                         "connection will allowed only from these IPs. By "
+                         "default connections from all IPs are allowed. "
+                         "Format: <dir>[(hostspec[|hostspec|...])][,...]. Where"
+                         " hostspec can be an IP address, hostname or an IP "
+                         "range in CIDR notation. "
+                         "e.g. /foo(192.168.1.0/24|host1|10.1.1.8),/host2."
+                         " NOTE: Care must be taken while configuring this "
+                         "option as invalid entries and/or unreachable DNS "
+                         "servers can introduce unwanted delay in all the mount"
+                         " calls."
         },
         { .key  = {"nfs3.export-dirs"},
           .type = GF_OPTION_TYPE_BOOL,
+          .default_value = "on",
           .description = "By default, all subvolumes of nfs are exported as "
                          "individual exports. There are cases where a "
                          "subdirectory or subdirectories in the volume need to "
                          "be exported separately. Enabling this option allows "
                          "any directory on a volumes to be exported separately."
-                         " Directory exports are enabled by default."
+                         "Directory exports are enabled by default."
         },
         { .key  = {"nfs3.export-volumes"},
           .type = GF_OPTION_TYPE_BOOL,
+          .default_value = "on",
           .description = "Enable or disable exporting whole volumes, instead "
                          "if used in conjunction with nfs3.export-dir, can "
                          "allow setting up only subdirectories as exports. On "
@@ -1091,6 +1588,7 @@ struct volume_options options[] = {
         },
         { .key  = {"rpc-auth.auth-unix"},
           .type = GF_OPTION_TYPE_BOOL,
+          .default_value = "on",
           .description = "Disable or enable the AUTH_UNIX authentication type."
                          "Must always be enabled for better interoperability."
                          "However, can be disabled if needed. Enabled by"
@@ -1098,12 +1596,14 @@ struct volume_options options[] = {
         },
         { .key  = {"rpc-auth.auth-null"},
           .type = GF_OPTION_TYPE_BOOL,
+          .default_value = "on",
           .description = "Disable or enable the AUTH_NULL authentication type."
                          "Must always be enabled. This option is here only to"
                          " avoid unrecognized option warnings"
         },
         { .key  = {"rpc-auth.auth-unix.*"},
           .type = GF_OPTION_TYPE_BOOL,
+          .default_value = "on",
           .description = "Disable or enable the AUTH_UNIX authentication type "
                          "for a particular exported volume overriding defaults"
                          " and general setting for AUTH_UNIX scheme. Must "
@@ -1113,6 +1613,7 @@ struct volume_options options[] = {
         },
         { .key  = {"rpc-auth.auth-unix.*.allow"},
           .type = GF_OPTION_TYPE_STR,
+          .default_value = "on",
           .description = "Disable or enable the AUTH_UNIX authentication type "
                          "for a particular exported volume overriding defaults"
                          " and general setting for AUTH_UNIX scheme. Must "
@@ -1122,6 +1623,7 @@ struct volume_options options[] = {
         },
         { .key  = {"rpc-auth.auth-null.*"},
           .type = GF_OPTION_TYPE_BOOL,
+          .default_value = "on",
           .description = "Disable or enable the AUTH_NULL authentication type "
                          "for a particular exported volume overriding defaults"
                          " and general setting for AUTH_NULL. Must always be "
@@ -1130,6 +1632,7 @@ struct volume_options options[] = {
         },
         { .key  = {"rpc-auth.addr.allow"},
           .type = GF_OPTION_TYPE_INTERNET_ADDRESS_LIST,
+          .default_value = "all",
           .description = "Allow a comma separated list of addresses and/or"
                          " hostnames to connect to the server. By default, all"
                          " connections are allowed. This allows users to "
@@ -1137,6 +1640,7 @@ struct volume_options options[] = {
         },
         { .key  = {"rpc-auth.addr.reject"},
           .type = GF_OPTION_TYPE_INTERNET_ADDRESS_LIST,
+          .default_value = "none",
           .description = "Reject a comma separated list of addresses and/or"
                          " hostnames from connecting to the server. By default,"
                          " all connections are allowed. This allows users to"
@@ -1144,6 +1648,7 @@ struct volume_options options[] = {
         },
         { .key  = {"rpc-auth.addr.*.allow"},
           .type = GF_OPTION_TYPE_INTERNET_ADDRESS_LIST,
+          .default_value = "all",
           .description = "Allow a comma separated list of addresses and/or"
                          " hostnames to connect to the server. By default, all"
                          " connections are allowed. This allows users to "
@@ -1151,6 +1656,7 @@ struct volume_options options[] = {
         },
         { .key  = {"rpc-auth.addr.*.reject"},
           .type = GF_OPTION_TYPE_INTERNET_ADDRESS_LIST,
+          .default_value = "none",
           .description = "Reject a comma separated list of addresses and/or"
                          " hostnames from connecting to the server. By default,"
                          " all connections are allowed. This allows users to"
@@ -1158,6 +1664,7 @@ struct volume_options options[] = {
         },
         { .key  = {"rpc-auth.ports.insecure"},
           .type = GF_OPTION_TYPE_BOOL,
+          .default_value = "off",
           .description = "Allow client connections from unprivileged ports. By "
                          "default only privileged ports are allowed. This is a"
                          "global setting in case insecure ports are to be "
@@ -1165,31 +1672,35 @@ struct volume_options options[] = {
         },
         { .key  = {"rpc-auth.ports.*.insecure"},
           .type = GF_OPTION_TYPE_BOOL,
+          .default_value = "off",
           .description = "Allow client connections from unprivileged ports. By "
                          "default only privileged ports are allowed. Use this"
                          " option to enable or disable insecure ports for "
-                         "a specific subvolume and to override the global setting "
-                         " set by the previous option."
+                         "a specific subvolume and to override the global "
+                         "setting set by the previous option."
         },
         { .key  = {"rpc-auth.addr.namelookup"},
           .type = GF_OPTION_TYPE_BOOL,
+          .default_value = "off",
           .description = "Users have the option of turning on name lookup for"
                   " incoming client connections using this option. Use this "
                   "option to turn on name lookups during address-based "
                   "authentication. Turning this on will enable you to"
-                  " use hostnames in rpc-auth.addr.* filters. In some "
+                  " use hostnames in nfs.rpc-auth-* filters. In some "
                   "setups, the name server can take too long to reply to DNS "
-                  "queries resulting in timeouts of mount requests. By default, "
-                  " name lookup is off"
+                  "queries resulting in timeouts of mount requests. By "
+                  "default, name lookup is off"
         },
         { .key  = {"nfs.dynamic-volumes"},
           .type = GF_OPTION_TYPE_BOOL,
+          .default_value = "off",
           .description = "Internal option set to tell gnfs to use a different"
                          " scheme for encoding file handles when DVM is being"
                          " used."
         },
         { .key  = {"nfs3.*.volume-id"},
           .type = GF_OPTION_TYPE_STR,
+          .default_value = "",
           .description = "When nfs.dynamic-volumes is set, gnfs expects every "
                          "subvolume to have this option set for it, so that "
                          "gnfs can use this option to identify the volume. "
@@ -1198,22 +1709,34 @@ struct volume_options options[] = {
         },
         { .key  = {"nfs.enable-ino32"},
           .type = GF_OPTION_TYPE_BOOL,
+          .default_value = "no",
           .description = "For nfs clients or apps that do not support 64-bit "
                          "inode numbers, use this option to make NFS return "
-                         "32-bit inode numbers instead. Disabled by default, so "
-                         "NFS returns 64-bit inode numbers."
+                         "32-bit inode numbers instead. Disabled by default, so"
+                         " NFS returns 64-bit inode numbers."
         },
         { .key  = {"rpc.register-with-portmap"},
           .type = GF_OPTION_TYPE_BOOL,
+          .default_value = "on",
           .description = "For systems that need to run multiple nfs servers, "
                          "only one registration is possible with "
                          "portmap service. Use this option to turn off portmap "
                          "registration for Gluster NFS. On by default"
         },
+        { .key  = {"rpc.outstanding-rpc-limit"},
+          .type = GF_OPTION_TYPE_INT,
+          .min  = RPCSVC_MIN_OUTSTANDING_RPC_LIMIT,
+          .max  = RPCSVC_MAX_OUTSTANDING_RPC_LIMIT,
+          .default_value = TOSTRING(RPCSVC_DEFAULT_OUTSTANDING_RPC_LIMIT),
+          .description = "Parameter to throttle the number of incoming RPC "
+                         "requests from a client. 0 means no limit (can "
+                         "potentially run out of memory)"
+        },
         { .key  = {"nfs.port"},
           .type = GF_OPTION_TYPE_INT,
           .min  = 1,
           .max  = 0xffff,
+          .default_value = TOSTRING(GF_NFS3_PORT),
           .description = "Use this option on systems that need Gluster NFS to "
                          "be associated with a non-default port number."
         },
@@ -1221,6 +1744,7 @@ struct volume_options options[] = {
           .type = GF_OPTION_TYPE_INT,
           .min  = 1,
           .max  = 1024,
+          .default_value = TOSTRING(GF_NFS_DEFAULT_MEMFACTOR),
           .description = "Use this option to make NFS be faster on systems by "
                          "using more memory. This option specifies a multiple "
                          "that determines the total amount of memory used. "
@@ -1231,12 +1755,14 @@ struct volume_options options[] = {
         },
         { .key  = {"nfs.*.disable"},
           .type = GF_OPTION_TYPE_BOOL,
+          .default_value = "false",
           .description = "This option is used to start or stop NFS server"
                          "for individual volume."
         },
 
         { .key  = {"nfs.nlm"},
           .type = GF_OPTION_TYPE_BOOL,
+          .default_value = "on",
           .description = "This option, if set to 'off', disables NLM server "
                          "by not registering the service with the portmapper."
                          " Set it to 'on' to re-enable it. Default value: 'on'"
@@ -1244,11 +1770,21 @@ struct volume_options options[] = {
 
         { .key = {"nfs.mount-udp"},
           .type = GF_OPTION_TYPE_BOOL,
+          .default_value = "off",
           .description = "set the option to 'on' to enable mountd on UDP. "
                          "Required for some Solaris and AIX NFS clients. "
                          "The need for enabling this option often depends "
                          "on the usage of NLM."
         },
+        { .key = {"nfs.mount-rmtab"},
+          .type = GF_OPTION_TYPE_PATH,
+          .default_value = DATADIR "/rmtab",
+          .description = "Set the location of the cache file that is used to "
+                         "list all the NFS-clients that have connected "
+                         "through the MOUNT protocol. If this is on shared "
+                         "storage, all GlusterFS servers will update and "
+                         "output (with 'showmount') the same list."
+        },
         { .key = {OPT_SERVER_AUX_GIDS},
           .type = GF_OPTION_TYPE_BOOL,
           .default_value = "off",
@@ -1267,7 +1803,23 @@ struct volume_options options[] = {
           .description = "Number of seconds to cache auxiliary-GID data, when "
                          OPT_SERVER_AUX_GIDS " is set."
         },
-
+        { .key = {"nfs.acl"},
+          .type = GF_OPTION_TYPE_BOOL,
+          .default_value = "on",
+          .description = "This option is used to control ACL support for NFS."
+        },
+        { .key  = {"nfs.drc"},
+          .type = GF_OPTION_TYPE_STR,
+          .default_value = "on",
+          .description = "Enable Duplicate Request Cache in gNFS server to "
+                         "improve correctness of non-idempotent operations like "
+                         "write, delete, link, et al"
+        },
+        { .key  = {"nfs.drc-size"},
+          .type = GF_OPTION_TYPE_INT,
+          .default_value = "0x20000",
+          .description = "Sets the number of non-idempotent "
+                         "requests to cache in drc"
+        },
         { .key  = {NULL} },
 };
-
diff --git a/xlators/nfs/server/src/nfs.h b/xlators/nfs/server/src/nfs.h
index 7d5163dfe..00c7f8046 100644
--- a/xlators/nfs/server/src/nfs.h
+++ b/xlators/nfs/server/src/nfs.h
@@ -2,19 +2,10 @@
   Copyright (c) 2010-2011 Gluster, Inc. <http://www.gluster.com>
   This file is part of GlusterFS.
 
-  GlusterFS is free software; you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published
-  by the Free Software Foundation; either version 3 of the License,
-  or (at your option) any later version.
-
-  GlusterFS is distributed in the hope that it will be useful, but
-  WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-  General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see
-  <http://www.gnu.org/licenses/>.
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
 */
 
 #ifndef __NFS_H__
@@ -45,7 +36,7 @@
 #define GF_NFS_MAX_MEMFACTOR            30
 
 #define GF_NFS_DVM_ON                   1
-#define GF_NFS_DVM_OFF                  2
+#define GF_NFS_DVM_OFF                  0
 
 /* This corresponds to the max 16 number of group IDs that are sent through an
  * RPC request. Since NFS is the only one going to set this, we can be safe
@@ -86,12 +77,15 @@ struct nfs_state {
         unsigned int            override_portnum;
         int                     allow_insecure;
         int                     enable_nlm;
+        int                     enable_acl;
         int                     mount_udp;
+        char                    *rmtab;
         struct rpc_clnt         *rpc_clnt;
         gf_boolean_t            server_aux_gids;
 	uint32_t		server_aux_gids_max_age;
 	gid_cache_t		gid_cache;
         uint32_t                generation;
+        gf_boolean_t            register_portmap;
 };
 
 struct nfs_inode_ctx {
diff --git a/xlators/nfs/server/src/nfs3-fh.c b/xlators/nfs/server/src/nfs3-fh.c
index eb8223924..e199c56dc 100644
--- a/xlators/nfs/server/src/nfs3-fh.c
+++ b/xlators/nfs/server/src/nfs3-fh.c
@@ -2,19 +2,10 @@
   Copyright (c) 2010-2011 Gluster, Inc. <http://www.gluster.com>
   This file is part of GlusterFS.
 
-  GlusterFS is free software; you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published
-  by the Free Software Foundation; either version 3 of the License,
-  or (at your option) any later version.
-
-  GlusterFS is distributed in the hope that it will be useful, but
-  WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-  General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see
-  <http://www.gnu.org/licenses/>.
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
 */
 
 #ifndef _CONFIG_H
@@ -46,6 +37,12 @@ nfs3_fh_validate (struct nfs3_fh *fh)
 	if (fh->ident[1] != GF_NFSFH_IDENT1)
 		return 0;
 
+       if (fh->ident[2] != GF_NFSFH_IDENT2)
+               return 0;
+
+       if (fh->ident[3] != GF_NFSFH_IDENT3)
+               return 0;
+
         return 1;
 }
 
@@ -58,6 +55,8 @@ nfs3_fh_init (struct nfs3_fh *fh, struct iatt *buf)
 
         fh->ident[0] = GF_NFSFH_IDENT0;
         fh->ident[1] = GF_NFSFH_IDENT1;
+        fh->ident[2] = GF_NFSFH_IDENT2;
+        fh->ident[3] = GF_NFSFH_IDENT3;
 
         uuid_copy (fh->gfid, buf->ia_gfid);
 }
@@ -112,17 +111,17 @@ nfs3_fh_is_root_fh (struct nfs3_fh *fh)
 
 
 void
-nfs3_fh_to_str (struct nfs3_fh *fh, char *str)
+nfs3_fh_to_str (struct nfs3_fh *fh, char *str, size_t len)
 {
-        char            gfid[512];
-        char            exportid[512];
+        char            gfid[GF_UUID_BUF_SIZE];
+        char            exportid[GF_UUID_BUF_SIZE];
 
         if ((!fh) || (!str))
                 return;
 
-        sprintf (str, "FH: exportid %s, gfid %s",
-                 uuid_utoa_r (fh->exportid, exportid),
-                 uuid_utoa_r (fh->gfid, gfid));
+        snprintf (str, len, "FH: exportid %s, gfid %s",
+                  uuid_utoa_r (fh->exportid, exportid),
+                  uuid_utoa_r (fh->gfid, gfid));
 }
 
 void
@@ -161,6 +160,8 @@ nfs3_build_fh (inode_t *inode, uuid_t exportid, struct nfs3_fh *newfh)
 
         newfh->ident[0] = GF_NFSFH_IDENT0;
         newfh->ident[1] = GF_NFSFH_IDENT1;
+        newfh->ident[2] = GF_NFSFH_IDENT2;
+        newfh->ident[3] = GF_NFSFH_IDENT3;
         uuid_copy (newfh->gfid, inode->gfid);
         uuid_copy (newfh->exportid, exportid);
         return 0;
diff --git a/xlators/nfs/server/src/nfs3-fh.h b/xlators/nfs/server/src/nfs3-fh.h
index a9002afe7..1049cdc96 100644
--- a/xlators/nfs/server/src/nfs3-fh.h
+++ b/xlators/nfs/server/src/nfs3-fh.h
@@ -2,19 +2,10 @@
   Copyright (c) 2010-2011 Gluster, Inc. <http://www.gluster.com>
   This file is part of GlusterFS.
 
-  GlusterFS is free software; you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published
-  by the Free Software Foundation; either version 3 of the License,
-  or (at your option) any later version.
-
-  GlusterFS is distributed in the hope that it will be useful, but
-  WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-  General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see
-  <http://www.gnu.org/licenses/>.
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
 */
 
 #ifndef _NFS_FH_H_
@@ -35,7 +26,9 @@
  * handles for now. This will change if and when we need v4. */
 #define GF_NFSFH_IDENT0         ':'
 #define GF_NFSFH_IDENT1         'O'
-#define GF_NFSFH_IDENT_SIZE     (sizeof(char) * 2)
+#define GF_NFSFH_IDENT2         'G'
+#define GF_NFSFH_IDENT3         'L'
+#define GF_NFSFH_IDENT_SIZE     (sizeof(char) * 4)
 #define GF_NFSFH_STATIC_SIZE    (GF_NFSFH_IDENT_SIZE + (2*sizeof (uuid_t)))
 
 #define nfs3_fh_exportid_to_index(exprtid)      ((uint16_t)exprtid[15])
@@ -45,9 +38,9 @@
 struct nfs3_fh {
 
         /* Used to ensure that a bunch of bytes are actually a GlusterFS NFS
-         * file handle. Should contain ":O"
+         * file handle. Should contain ":OGL"
          */
-        char                    ident[2];
+        char                    ident[4];
 
         /* UUID that identifies an export. The value stored in exportid
          * depends on the usage of gluster nfs. If the DVM is enabled using
@@ -63,6 +56,11 @@ struct nfs3_fh {
 
         /* File/dir gfid. */
         uuid_t                  gfid;
+        /* This structure must be exactly NFS3_FHSIZE (64) bytes long.
+           Having the structure shorter results in buffer overflows
+           during XDR decoding.
+        */
+        unsigned char padding[NFS3_FHSIZE - GF_NFSFH_STATIC_SIZE];
 } __attribute__((__packed__));
 
 #define GF_NFS3FH_STATIC_INITIALIZER    {{0},}
@@ -90,7 +88,7 @@ extern void
 nfs3_log_fh (struct nfs3_fh *fh);
 
 extern void
-nfs3_fh_to_str (struct nfs3_fh *fh, char *str);
+nfs3_fh_to_str (struct nfs3_fh *fh, char *str, size_t len);
 
 extern int
 nfs3_fh_build_parent_fh (struct nfs3_fh *child, struct iatt *newstat,
diff --git a/xlators/nfs/server/src/nfs3-helpers.c b/xlators/nfs/server/src/nfs3-helpers.c
index fbfd17d1a..9059fc341 100644
--- a/xlators/nfs/server/src/nfs3-helpers.c
+++ b/xlators/nfs/server/src/nfs3-helpers.c
@@ -2,19 +2,10 @@
   Copyright (c) 2010-2011 Gluster, Inc. <http://www.gluster.com>
   This file is part of GlusterFS.
 
-  GlusterFS is free software; you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published
-  by the Free Software Foundation; either version 3 of the License,
-  or (at your option) any later version.
-
-  GlusterFS is distributed in the hope that it will be useful, but
-  WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-  General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see
-  <http://www.gnu.org/licenses/>.
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
 */
 
 #ifndef _CONFIG_H
@@ -265,6 +256,20 @@ nfs3_errno_to_nfsstat3 (int errnum)
         return stat;
 }
 
+/*
+ * Special case: If op_ret is -1, it's very unusual op_errno being
+ * 0 which means something came wrong from upper layer(s). If it
+ * happens by any means, then set NFS3 status to NFS3ERR_SERVERFAULT.
+ */
+inline nfsstat3
+nfs3_cbk_errno_status (int32_t op_ret, int32_t op_errno)
+{
+        if ((op_ret == -1) && (op_errno == 0)) {
+                return NFS3ERR_SERVERFAULT;
+        }
+
+        return nfs3_errno_to_nfsstat3 (op_errno);
+}
 
 void
 nfs3_fill_lookup3res_error (lookup3res *res, nfsstat3 stat,
@@ -284,6 +289,9 @@ nfs3_stat_to_fattr3 (struct iatt *buf)
 {
         fattr3          fa = {0, };
 
+        if (buf == NULL)
+                goto out;
+
         if (IA_ISDIR (buf->ia_type))
                 fa.type = NF3DIR;
         else if (IA_ISREG (buf->ia_type))
@@ -353,6 +361,7 @@ nfs3_stat_to_fattr3 (struct iatt *buf)
         fa.mtime.seconds = buf->ia_mtime;
         fa.mtime.nseconds = buf->ia_mtime_nsec;
 
+out:
         return fa;
 }
 
@@ -496,7 +505,7 @@ nfs3_fill_fsinfo3res (struct nfs3_state *nfs3, fsinfo3res *res,
         resok.wtpref = nfs3->writesize;
         resok.wtmult = GF_NFS3_WTMULT;
         resok.dtpref = nfs3->readdirsize;
-        resok.maxfilesize = GF_NFS3_MAXFILE;
+        resok.maxfilesize = GF_NFS3_MAXFILESIZE;
         resok.time_delta = tdelta;
         resok.properties = GF_NFS3_FS_PROP;
 
@@ -591,7 +600,8 @@ nfs3_request_to_accessbits (int32_t accbits)
         return acc_request;
 }
 void
-nfs3_fill_access3res (access3res *res, nfsstat3 status, int32_t accbits)
+nfs3_fill_access3res (access3res *res, nfsstat3 status, int32_t accbits,
+		      int32_t reqaccbits)
 {
         uint32_t        accres = 0;
 
@@ -602,7 +612,8 @@ nfs3_fill_access3res (access3res *res, nfsstat3 status, int32_t accbits)
 
         accres = nfs3_accessbits (accbits);
 
-        res->access3res_u.resok.access = accres;
+	/* do not answer what was not asked */
+        res->access3res_u.resok.access = accres & reqaccbits;
 }
 
 void
@@ -1605,13 +1616,14 @@ err:
 
 void
 nfs3_stat_to_errstr (uint32_t xid, char *op, nfsstat3 stat, int pstat,
-                     char *errstr)
+                     char *errstr, size_t len)
 {
         if ((!op) || (!errstr))
                 return;
 
-        sprintf (errstr, "XID: %x, %s: NFS: %d(%s), POSIX: %d(%s)", xid, op,
-                 stat, nfsstat3_strerror (stat), pstat, strerror (pstat));
+        snprintf (errstr, len, "XID: %x, %s: NFS: %d(%s), POSIX: %d(%s)",
+                  xid, op,stat, nfsstat3_strerror (stat), pstat,
+                  strerror (pstat));
 }
 
 void
@@ -1619,10 +1631,10 @@ nfs3_log_common_call (uint32_t xid, char *op, struct nfs3_fh *fh)
 {
         char    fhstr[1024];
 
-	if (THIS->ctx->log.loglevel < GF_LOG_DEBUG)
-		return;
+        if (THIS->ctx->log.loglevel < GF_LOG_DEBUG)
+                return;
 
-        nfs3_fh_to_str (fh, fhstr);
+        nfs3_fh_to_str (fh, fhstr, sizeof (fhstr));
         gf_log (GF_NFS3, GF_LOG_DEBUG, "XID: %x, %s: args: %s", xid, op,
                 fhstr);
 }
@@ -1634,9 +1646,9 @@ nfs3_log_fh_entry_call (uint32_t xid, char *op, struct nfs3_fh *fh,
 {
         char    fhstr[1024];
 
-	if (THIS->ctx->log.loglevel < GF_LOG_DEBUG)
-		return;
-        nfs3_fh_to_str (fh, fhstr);
+        if (THIS->ctx->log.loglevel < GF_LOG_DEBUG)
+                return;
+        nfs3_fh_to_str (fh, fhstr, sizeof (fhstr));
         gf_log (GF_NFS3, GF_LOG_DEBUG, "XID: %x, %s: args: %s, name: %s", xid,
                 op, fhstr, name);
 }
@@ -1649,10 +1661,10 @@ nfs3_log_rename_call (uint32_t xid, struct nfs3_fh *src, char *sname,
         char    sfhstr[1024];
         char    dfhstr[1024];
 
-	if (THIS->ctx->log.loglevel < GF_LOG_DEBUG)
-		return;
-        nfs3_fh_to_str (src, sfhstr);
-        nfs3_fh_to_str (dst, dfhstr);
+        if (THIS->ctx->log.loglevel < GF_LOG_DEBUG)
+                return;
+        nfs3_fh_to_str (src, sfhstr, sizeof (sfhstr));
+        nfs3_fh_to_str (dst, dfhstr, sizeof (dfhstr));
         gf_log (GF_NFS3, GF_LOG_DEBUG, "XID: %x, RENAME: args: Src: %s, "
                 "name: %s, Dst: %s, name: %s", xid, sfhstr, sname, dfhstr,
                 dname);
@@ -1670,9 +1682,9 @@ nfs3_log_create_call (uint32_t xid, struct nfs3_fh *fh, char *name,
         char    unchkd[] = "UNCHECKED";
         char    guarded[] = "GUARDED";
 
-	if (THIS->ctx->log.loglevel < GF_LOG_DEBUG)
-		return;
-        nfs3_fh_to_str (fh, fhstr);
+        if (THIS->ctx->log.loglevel < GF_LOG_DEBUG)
+                return;
+        nfs3_fh_to_str (fh, fhstr, sizeof (fhstr));
         if (mode == EXCLUSIVE)
                 modestr = exclmode;
         else if (mode == GUARDED)
@@ -1695,9 +1707,9 @@ nfs3_log_mknod_call (uint32_t xid, struct nfs3_fh *fh, char *name, int type)
         char    sock[] = "SOCK";
         char    fifo[] = "FIFO";
 
-	if (THIS->ctx->log.loglevel < GF_LOG_DEBUG)
-		return;
-        nfs3_fh_to_str (fh, fhstr);
+        if (THIS->ctx->log.loglevel < GF_LOG_DEBUG)
+                return;
+        nfs3_fh_to_str (fh, fhstr, sizeof (fhstr));
         if (type == NF3CHR)
                 modestr = chr;
         else if (type == NF3BLK)
@@ -1718,9 +1730,9 @@ nfs3_log_symlink_call (uint32_t xid, struct nfs3_fh *fh, char *name, char *tgt)
 {
         char    fhstr[1024];
 
-	if (THIS->ctx->log.loglevel < GF_LOG_DEBUG)
-		return;
-        nfs3_fh_to_str (fh, fhstr);
+        if (THIS->ctx->log.loglevel < GF_LOG_DEBUG)
+                return;
+        nfs3_fh_to_str (fh, fhstr, sizeof (fhstr));
         gf_log (GF_NFS3, GF_LOG_DEBUG, "XID: %x, SYMLINK: args: %s, name: %s,"
                 " target: %s", xid, fhstr, name, tgt);
 }
@@ -1733,10 +1745,10 @@ nfs3_log_link_call (uint32_t xid, struct nfs3_fh *fh, char *name,
         char    dfhstr[1024];
         char    tfhstr[1024];
 
-	if (THIS->ctx->log.loglevel < GF_LOG_DEBUG)
-		return;
-        nfs3_fh_to_str (fh, dfhstr);
-        nfs3_fh_to_str (tgt, tfhstr);
+        if (THIS->ctx->log.loglevel < GF_LOG_DEBUG)
+                return;
+        nfs3_fh_to_str (fh, dfhstr, sizeof (dfhstr));
+        nfs3_fh_to_str (tgt, tfhstr, sizeof (tfhstr));
         gf_log (GF_NFS3, GF_LOG_DEBUG, "XID: %x, LINK: args: %s, name: %s,"
                 " target: %s", xid, dfhstr, name, tfhstr);
 }
@@ -1748,9 +1760,9 @@ nfs3_log_rw_call (uint32_t xid, char *op, struct nfs3_fh *fh, offset3 offt,
 {
         char    fhstr[1024];
 
-	if (THIS->ctx->log.loglevel < GF_LOG_DEBUG)
-		return;
-        nfs3_fh_to_str (fh, fhstr);
+        if (THIS->ctx->log.loglevel < GF_LOG_DEBUG)
+                return;
+        nfs3_fh_to_str (fh, fhstr, sizeof (fhstr));
         if (stablewrite == -1)
                 gf_log (GF_NFS3, GF_LOG_DEBUG, "XID: %x, %s: args: %s, offset:"
                         " %"PRIu64",  count: %"PRIu32, xid, op, fhstr, offt,
@@ -3381,11 +3393,11 @@ void
 nfs3_log_common_res (uint32_t xid, int op, nfsstat3 stat, int pstat)
 {
         char    errstr[1024];
-	int	ll = nfs3_loglevel (op, stat);
+        int     ll = nfs3_loglevel (op, stat);
 
-	if (THIS->ctx->log.loglevel < ll)
-		return;
-        nfs3_stat_to_errstr (xid, nfs3op_strings[op].str, stat, pstat, errstr);
+        if (THIS->ctx->log.loglevel < ll)
+                return;
+        nfs3_stat_to_errstr (xid, nfs3op_strings[op].str, stat, pstat, errstr, sizeof (errstr));
         gf_log (GF_NFS3, ll, "%s", errstr);
 }
 
@@ -3393,14 +3405,14 @@ void
 nfs3_log_readlink_res (uint32_t xid, nfsstat3 stat, int pstat, char *linkpath)
 {
         char    errstr[1024];
-	int	ll = nfs3_loglevel (NFS3_READLINK, stat);
+        int     ll = nfs3_loglevel (NFS3_READLINK, stat);
 
-	if (THIS->ctx->log.loglevel < ll)
-		return;
+        if (THIS->ctx->log.loglevel < ll)
+                return;
 
-        nfs3_stat_to_errstr (xid, "READLINK", stat, pstat, errstr);
+        nfs3_stat_to_errstr (xid, "READLINK", stat, pstat, errstr, sizeof (errstr));
         gf_log (GF_NFS3, ll, "%s, target: %s",
-		errstr, linkpath);
+                errstr, linkpath);
 
 }
 
@@ -3409,12 +3421,12 @@ nfs3_log_read_res (uint32_t xid, nfsstat3 stat, int pstat, count3 count,
                    int is_eof, struct iovec *vec, int32_t veccount)
 {
         char    errstr[1024];
-	int	ll = GF_LOG_DEBUG;
+        int     ll = GF_LOG_DEBUG;
 
 	ll = nfs3_loglevel (NFS3_READ, stat);
-	if (THIS->ctx->log.loglevel < ll)
-		return;
-        nfs3_stat_to_errstr (xid, "READ", stat, pstat, errstr);
+        if (THIS->ctx->log.loglevel < ll)
+                return;
+        nfs3_stat_to_errstr (xid, "READ", stat, pstat, errstr, sizeof (errstr));
         if (vec)
                 gf_log (GF_NFS3, ll, "%s, count: %"PRIu32", is_eof:"
                         " %d, vector: count: %d, len: %zd", errstr, count,
@@ -3430,12 +3442,12 @@ nfs3_log_write_res (uint32_t xid, nfsstat3 stat, int pstat, count3 count,
                     int stable, uint64_t wverf)
 {
         char    errstr[1024];
-	int	ll = nfs3_loglevel (NFS3_WRITE, stat);
+        int     ll = nfs3_loglevel (NFS3_WRITE, stat);
 
-	if (THIS->ctx->log.loglevel < ll)
-		return;
+        if (THIS->ctx->log.loglevel < ll)
+                 return;
 
-        nfs3_stat_to_errstr (xid, "WRITE", stat, pstat, errstr);
+        nfs3_stat_to_errstr (xid, "WRITE", stat, pstat, errstr, sizeof (errstr));
         gf_log (GF_NFS3, ll, "%s, count: %"PRIu32", %s,wverf: %"PRIu64
                 , errstr, count, (stable == UNSTABLE)?"UNSTABLE":"STABLE",
                 wverf);
@@ -3448,12 +3460,12 @@ nfs3_log_newfh_res (uint32_t xid, int op, nfsstat3 stat, int pstat,
 {
         char    errstr[1024];
         char    fhstr[1024];
-	int	ll = nfs3_loglevel (op, stat);
+        int     ll = nfs3_loglevel (op, stat);
 
-	if (THIS->ctx->log.loglevel < ll)
-		return;
-        nfs3_stat_to_errstr (xid, nfs3op_strings[op].str, stat, pstat, errstr);
-        nfs3_fh_to_str (newfh, fhstr);
+        if (THIS->ctx->log.loglevel < ll)
+                return;
+        nfs3_stat_to_errstr (xid, nfs3op_strings[op].str, stat, pstat, errstr, sizeof (errstr));
+        nfs3_fh_to_str (newfh, fhstr, sizeof (fhstr));
 
         gf_log (GF_NFS3, nfs3_loglevel (op, stat), "%s, %s", errstr, fhstr);
 }
@@ -3464,11 +3476,11 @@ nfs3_log_readdir_res (uint32_t xid, nfsstat3 stat, int pstat, uint64_t cverf,
                       count3 count, int is_eof)
 {
         char    errstr[1024];
-	int	ll = nfs3_loglevel (NFS3_READDIR, stat);
+        int     ll = nfs3_loglevel (NFS3_READDIR, stat);
 
-	if (THIS->ctx->log.loglevel < ll)
-		return;
-        nfs3_stat_to_errstr (xid, "READDIR", stat, pstat, errstr);
+        if (THIS->ctx->log.loglevel < ll)
+                return;
+        nfs3_stat_to_errstr (xid, "READDIR", stat, pstat, errstr, sizeof (errstr));
         gf_log (GF_NFS3, ll, "%s, count: %"PRIu32", cverf: %"PRIu64
                 ", is_eof: %d", errstr, count, cverf, is_eof);
 }
@@ -3481,9 +3493,9 @@ nfs3_log_readdirp_res (uint32_t xid, nfsstat3 stat, int pstat, uint64_t cverf,
         char    errstr[1024];
 	int	ll = nfs3_loglevel (NFS3_READDIRP, stat);
 
-	if (THIS->ctx->log.loglevel < ll)
-		return;
-        nfs3_stat_to_errstr (xid, "READDIRPLUS", stat, pstat, errstr);
+        if (THIS->ctx->log.loglevel < ll)
+                return;
+        nfs3_stat_to_errstr (xid, "READDIRPLUS", stat, pstat, errstr, sizeof (errstr));
         gf_log (GF_NFS3, ll, "%s, dircount: %"PRIu32", maxcount: %"
                 PRIu32", cverf: %"PRIu64", is_eof: %d", errstr, dircount,
                 maxcount, cverf, is_eof);
@@ -3496,9 +3508,9 @@ nfs3_log_commit_res (uint32_t xid, nfsstat3 stat, int pstat, uint64_t wverf)
         char    errstr[1024];
 	int	ll = nfs3_loglevel (NFS3_COMMIT, stat);
 
-	if (THIS->ctx->log.loglevel < ll)
-		return;
-        nfs3_stat_to_errstr (xid, "COMMIT", stat, pstat, errstr);
+        if (THIS->ctx->log.loglevel < ll)
+                return;
+        nfs3_stat_to_errstr (xid, "COMMIT", stat, pstat, errstr, sizeof (errstr));
         gf_log (GF_NFS3, ll, "%s, wverf: %"PRIu64, errstr, wverf);
 }
 
@@ -3509,10 +3521,10 @@ nfs3_log_readdir_call (uint32_t xid, struct nfs3_fh *fh, count3 dircount,
 {
         char    fhstr[1024];
 
-	if (THIS->ctx->log.loglevel < GF_LOG_DEBUG)
-		return;
+        if (THIS->ctx->log.loglevel < GF_LOG_DEBUG)
+                return;
 
-        nfs3_fh_to_str (fh, fhstr);
+        nfs3_fh_to_str (fh, fhstr, sizeof (fhstr));
 
         if (maxcount == 0)
                 gf_log (GF_NFS3, GF_LOG_DEBUG, "XID: %x, READDIR: args: %s,"
diff --git a/xlators/nfs/server/src/nfs3-helpers.h b/xlators/nfs/server/src/nfs3-helpers.h
index 67935d143..4de1d5623 100644
--- a/xlators/nfs/server/src/nfs3-helpers.h
+++ b/xlators/nfs/server/src/nfs3-helpers.h
@@ -2,19 +2,10 @@
   Copyright (c) 2010-2011 Gluster, Inc. <http://www.gluster.com>
   This file is part of GlusterFS.
 
-  GlusterFS is free software; you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published
-  by the Free Software Foundation; either version 3 of the License,
-  or (at your option) any later version.
-
-  GlusterFS is distributed in the hope that it will be useful, but
-  WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-  General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see
-  <http://www.gnu.org/licenses/>.
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
 */
 
 #ifndef _NFS3_HELPER_H_
@@ -44,6 +35,9 @@ nfs3_extract_lookup_name (lookup3args *args);
 extern nfsstat3
 nfs3_errno_to_nfsstat3 (int errnum);
 
+extern nfsstat3
+nfs3_cbk_errno_status (int32_t, int32_t);
+
 extern void
 nfs3_fill_lookup3res (lookup3res *res, nfsstat3 stat, struct nfs3_fh *newfh,
                       struct iatt *stbuf, struct iatt *postparent,
@@ -99,7 +93,8 @@ extern void
 nfs3_prep_access3args (access3args *args, struct nfs3_fh *fh);
 
 extern void
-nfs3_fill_access3res (access3res *res, nfsstat3 status, int32_t accbits);
+nfs3_fill_access3res (access3res *res, nfsstat3 status, int32_t accbits,
+		      int32_t reqaccbits);
 
 extern char *
 nfs3_fhcache_getpath (struct nfs3_state *nfs3, struct nfs3_fh *fh);
diff --git a/xlators/nfs/server/src/nfs3.c b/xlators/nfs/server/src/nfs3.c
index 3a4ad4c0a..f914c3193 100644
--- a/xlators/nfs/server/src/nfs3.c
+++ b/xlators/nfs/server/src/nfs3.c
@@ -2,19 +2,10 @@
   Copyright (c) 2010-2011 Gluster, Inc. <http://www.gluster.com>
   This file is part of GlusterFS.
 
-  GlusterFS is free software; you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published
-  by the Free Software Foundation; either version 3 of the License,
-  or (at your option) any later version.
-
-  GlusterFS is distributed in the hope that it will be useful, but
-  WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-  General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see
-  <http://www.gnu.org/licenses/>.
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
 */
 
 #ifndef _CONFIG_H
@@ -226,32 +217,32 @@ out:
                         uuid_unparse (handle->exportid, exportid);      \
                         uuid_unparse (handle->gfid, gfid);              \
                         trans = rpcsvc_request_transport (req);         \
-                        gf_log (GF_NFS3, GF_LOG_ERROR, "Failed to map " \
-                                "FH to vol: client=%s, exportid=%s, gfid=%s",\
-                                trans->peerinfo.identifier, exportid,   \
-                                gfid);                                  \
-                        gf_log (GF_NFS3, GF_LOG_ERROR,                   \
-                                "Stale nfs client %s must be trying to "\
-                                "connect to a deleted volume, please "  \
-                                "unmount it.", trans->peerinfo.identifier);\
+                        GF_LOG_OCCASIONALLY (nfs3state->occ_logger,     \
+                                GF_NFS3, GF_LOG_ERROR, "Failed to map " \
+                                "FH to vol: client=%s, exportid=%s, "   \
+                                "gfid=%s", trans->peerinfo.identifier,  \
+                                exportid, gfid);                        \
+                        GF_LOG_OCCASIONALLY (nfs3state->occ_logger,     \
+                                GF_NFS3, GF_LOG_ERROR, "Stale nfs "     \
+                                "client %s must be trying to connect to"\
+                                " a deleted volume, please unmount it.",\
+                                trans->peerinfo.identifier);            \
                         status = NFS3ERR_STALE;                         \
                         goto label;                                     \
                 } else {                                                \
-                        gf_log (GF_NFS3, GF_LOG_TRACE, "FH to Volume: %s"\
-                                ,volume->name);                         \
-                        rpcsvc_request_set_private (req, volume);   \
+                        gf_log (GF_NFS3, GF_LOG_TRACE, "FH to Volume:"  \
+                                "%s", volume->name);                    \
+                        rpcsvc_request_set_private (req, volume);       \
                 }                                                       \
         } while (0);                                                    \
 
 
 #define nfs3_validate_gluster_fh(handle, status, errlabel)              \
         do {                                                            \
-                if ((handle)) {                                         \
-                        if (!nfs3_fh_validate (handle)) {               \
-                                gf_log (GF_NFS3, GF_LOG_ERROR, "Bad Handle");\
-                                status = NFS3ERR_BADHANDLE;             \
-                                goto errlabel;                          \
-                        }                                               \
+                if (!nfs3_fh_validate (handle)) {                       \
+                        gf_log (GF_NFS3, GF_LOG_ERROR, "Bad Handle");   \
+                        status = NFS3ERR_BADHANDLE;                     \
+                        goto errlabel;                                  \
                 }                                                       \
         } while (0)                                                     \
 
@@ -265,10 +256,12 @@ out:
                         xlatorp = nfs3_fh_to_xlator (cst->nfs3state,    \
                                                      &cst->resolvefh);  \
                         uuid_unparse (cst->resolvefh.gfid, gfid);       \
-                        sprintf (buf, "(%s) %s : %s", trans->peerinfo.identifier,\
-                        xlatorp ? xlatorp->name : "ERR", gfid);         \
-                        gf_log (GF_NFS3, GF_LOG_ERROR, "Unable to resolve FH"\
-                                ": %s", buf);                           \
+                        snprintf (buf, sizeof (buf), "(%s) %s : %s",             \
+                                  trans->peerinfo.identifier,           \
+                                  xlatorp ? xlatorp->name : "ERR",      \
+                                  gfid );                                \
+                        gf_log (GF_NFS3, GF_LOG_ERROR, "%s: %s",        \
+                                strerror(cst->resolve_errno), buf);     \
                         nfstat = nfs3_errno_to_nfsstat3 (cst->resolve_errno);\
                         goto erlabl;                                    \
                 }                                                       \
@@ -285,10 +278,12 @@ out:
                         xlatorp = nfs3_fh_to_xlator (cst->nfs3state,    \
                                                      &cst->resolvefh);  \
                         uuid_unparse (cst->resolvefh.gfid, gfid);       \
-                        sprintf (buf, "(%s) %s : %s", trans->peerinfo.identifier,\
-                        xlatorp ? xlatorp->name : "ERR", gfid);         \
-                        gf_log (GF_NFS3, GF_LOG_ERROR, "Unable to resolve FH"\
-                                ": %s", buf);                           \
+                        snprintf (buf, sizeof (buf), "(%s) %s : %s",             \
+                                  trans->peerinfo.identifier,     \
+                                  xlatorp ? xlatorp->name : "ERR",      \
+                                  gfid);         \
+                        gf_log (GF_NFS3, GF_LOG_ERROR, "%s: %s",        \
+                                strerror(cst->resolve_errno), buf);     \
                         nfstat = nfs3_errno_to_nfsstat3 (cs->resolve_errno);\
                         goto erlabl;                                    \
                 }                                                       \
@@ -554,23 +549,18 @@ nfs3svc_submit_reply (rpcsvc_request_t *req, void *arg, nfs3_serializer sfunc)
 
         iobref = iobref_new ();
         if (!iobref) {
-                iobuf_unref (iob);
                 gf_log (GF_NFS3, GF_LOG_ERROR, "failed on iobref_new()");
                 goto ret;
         }
 
-        iobref_add (iobref, iob);
+        ret = iobref_add (iobref, iob);
+        if (ret) {
+                gf_log (GF_NFS3, GF_LOG_ERROR, "Failed to add iob to iobref");
+                goto ret;
+        }
 
         /* Then, submit the message for transmission. */
         ret = rpcsvc_submit_message (req, &outmsg, 1, NULL, 0, iobref);
-
-        /* Now that we've done our job of handing the message to the RPC layer
-         * we can safely unref the iob in the hope that RPC layer must have
-         * ref'ed the iob on receiving into the txlist.
-         */
-        iobuf_unref (iob);
-        iobref_unref (iobref);
-
         if (ret == -1) {
                 gf_log (GF_NFS3, GF_LOG_ERROR, "Reply submission failed");
                 goto ret;
@@ -578,6 +568,14 @@ nfs3svc_submit_reply (rpcsvc_request_t *req, void *arg, nfs3_serializer sfunc)
 
         ret = 0;
 ret:
+        /* Now that we've done our job of handing the message to the RPC layer
+         * we can safely unref the iob in the hope that RPC layer must have
+         * ref'ed the iob on receiving into the txlist.
+         */
+        if (NULL != iob)
+                iobuf_unref (iob);
+        if (NULL != iobref)
+                iobref_unref (iobref);
         return ret;
 }
 
@@ -609,19 +607,14 @@ nfs3svc_submit_vector_reply (rpcsvc_request_t *req, void *arg,
                 new_iobref = 1;
         }
 
-        iobref_add (iobref, iob);
+        ret = iobref_add (iobref, iob);
+        if (ret) {
+                gf_log (GF_NFS3, GF_LOG_ERROR, "Failed to add iob to iobref");
+                goto ret;
+        }
 
         /* Then, submit the message for transmission. */
         ret = rpcsvc_submit_message (req, &outmsg, 1, payload, vcount, iobref);
-
-        /* Now that we've done our job of handing the message to the RPC layer
-         * we can safely unref the iob in the hope that RPC layer must have
-         * ref'ed the iob on receiving into the txlist.
-         */
-        iobuf_unref (iob);
-        if (new_iobref)
-                iobref_unref (iobref);
-
         if (ret == -1) {
                 gf_log (GF_NFS3, GF_LOG_ERROR, "Reply submission failed");
                 goto ret;
@@ -629,6 +622,14 @@ nfs3svc_submit_vector_reply (rpcsvc_request_t *req, void *arg,
 
         ret = 0;
 ret:
+        /* Now that we've done our job of handing the message to the RPC layer
+         * we can safely unref the iob in the hope that RPC layer must have
+         * ref'ed the iob on receiving into the txlist.
+         */
+        if (NULL != iob)
+                iobuf_unref (iob);
+        if (new_iobref)
+                iobref_unref (iobref);
         return ret;
 }
 
@@ -703,7 +704,7 @@ nfs3svc_getattr_lookup_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                 gf_log (GF_NFS, GF_LOG_WARNING,
                         "%x: %s => -1 (%s)", rpcsvc_request_xid (cs->req),
                         cs->resolvedloc.path, strerror (op_errno));
-                status = nfs3_errno_to_nfsstat3 (op_errno);
+                status = nfs3_cbk_errno_status (op_ret, op_errno);
         }
         else {
                 nfs_fix_generation(this,inode);
@@ -733,7 +734,7 @@ nfs3svc_getattr_stat_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                 gf_log (GF_NFS, GF_LOG_WARNING,
                         "%x: %s => -1 (%s)", rpcsvc_request_xid (cs->req),
                         cs->resolvedloc.path, strerror (op_errno));
-                status = nfs3_errno_to_nfsstat3 (op_errno);
+                status = nfs3_cbk_errno_status (op_ret, op_errno);
         }
 
         nfs3_log_common_res (rpcsvc_request_xid (cs->req), NFS3_GETATTR,
@@ -917,7 +918,7 @@ nfs3svc_truncate_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                 gf_log (GF_NFS, GF_LOG_WARNING,
                         "%x: %s => -1 (%s)", rpcsvc_request_xid (cs->req),
                         cs->resolvedloc.path, strerror (op_errno));
-                stat = nfs3_errno_to_nfsstat3 (op_errno);
+                stat = nfs3_cbk_errno_status (op_ret, op_errno);
                 goto nfs3err;
         }
 
@@ -957,7 +958,7 @@ nfs3svc_setattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                 gf_log (GF_NFS, GF_LOG_WARNING,
                         "%x: %s => -1 (%s)", rpcsvc_request_xid (cs->req),
                         cs->resolvedloc.path, strerror (op_errno));
-                stat = nfs3_errno_to_nfsstat3 (op_errno);
+                stat = nfs3_cbk_errno_status (op_ret, op_errno);
                 goto nfs3err;
         }
 
@@ -971,7 +972,8 @@ nfs3svc_setattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
          * truncation and also only if this is not a directory.
          */
         if ((gf_attr_size_set (cs->setattr_valid)) &&
-            (!IA_ISDIR (postop->ia_type))) {
+            (!IA_ISDIR (postop->ia_type)) &&
+            (preop->ia_size != cs->stbuf.ia_size)) {
                 nfs_request_user_init (&nfu, cs->req);
                 ret = nfs_truncate (cs->nfsx, cs->vol, &nfu, &cs->resolvedloc,
                                     cs->stbuf.ia_size, nfs3svc_truncate_cbk,cs);
@@ -1012,7 +1014,7 @@ nfs3svc_setattr_stat_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                 gf_log (GF_NFS, GF_LOG_WARNING,
                         "%x: %s => -1 (%s)", rpcsvc_request_xid (cs->req),
                         cs->resolvedloc.path, strerror (op_errno));
-                stat = nfs3_errno_to_nfsstat3 (op_errno);
+                stat = nfs3_cbk_errno_status (op_ret, op_errno);
                 goto nfs3err;
         }
 
@@ -1226,7 +1228,7 @@ nfs3svc_lookup_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                         (op_errno == ENOENT ? GF_LOG_TRACE : GF_LOG_WARNING),
                         "%x: %s => -1 (%s)", rpcsvc_request_xid (cs->req),
                         cs->resolvedloc.path, strerror (op_errno));
-                status = nfs3_errno_to_nfsstat3 (op_errno);
+                status = nfs3_cbk_errno_status (op_ret, op_errno);
                 goto xmit_res;
         }
 
@@ -1270,7 +1272,7 @@ nfs3svc_lookup_parentdir_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                 gf_log (GF_NFS, GF_LOG_WARNING,
                         "%x: %s => -1 (%s)", rpcsvc_request_xid (cs->req),
                         cs->resolvedloc.path, strerror (op_errno));
-                status = nfs3_errno_to_nfsstat3 (op_errno);
+                status = nfs3_cbk_errno_status (op_ret, op_errno);
                 goto xmit_res;
         }
 
@@ -1312,7 +1314,11 @@ nfs3_lookup_parentdir_resume (void *carg)
         nfs3_call_state_t               *cs = NULL;
         inode_t                         *parent = NULL;
 
-        GF_VALIDATE_OR_GOTO (GF_NFS3, carg, nfs3err);
+        if (!carg) {
+                gf_log (GF_NFS3, GF_LOG_ERROR, "Invalid argument,"
+                        " carg value NULL");
+                return EINVAL;
+        }
 
         cs = (nfs3_call_state_t *)carg;
         nfs3_check_fh_resolve_status (cs, stat, nfs3err);
@@ -1383,7 +1389,11 @@ nfs3_lookup_resume (void *carg)
         nfs3_call_state_t               *cs = NULL;
         struct nfs3_fh                  newfh = {{0},};
 
-        GF_VALIDATE_OR_GOTO (GF_NFS3, carg, nfs3err);
+        if (!carg) {
+                gf_log (GF_NFS3, GF_LOG_ERROR, "Invalid argument,"
+                        " carg value NULL");
+                return EINVAL;
+        }
 
         cs = (nfs3_call_state_t *)carg;
         nfs3_check_fh_resolve_status (cs, stat, nfs3err);
@@ -1495,11 +1505,12 @@ rpcerr:
 
 
 int
-nfs3_access_reply (rpcsvc_request_t *req, nfsstat3 status, int32_t accbits)
+nfs3_access_reply (rpcsvc_request_t *req, nfsstat3 status, int32_t accbits,
+		   int32_t reqaccbits)
 {
         access3res      res;
 
-        nfs3_fill_access3res (&res, status, accbits);
+        nfs3_fill_access3res (&res, status, accbits, reqaccbits);
         nfs3svc_submit_reply (req, &res,
                               (nfs3_serializer)xdr_serialize_access3res);
         return 0;
@@ -1519,11 +1530,11 @@ nfs3svc_access_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                 gf_log (GF_NFS, GF_LOG_WARNING,
                         "%x: %s => -1 (%s)", rpcsvc_request_xid (cs->req),
                         cs->resolvedloc.path, strerror (op_errno));
-                status = nfs3_errno_to_nfsstat3 (op_errno);
+                status = nfs3_cbk_errno_status (op_ret, op_errno);
         }
         nfs3_log_common_res (rpcsvc_request_xid (cs->req), NFS3_ACCESS, status,
                              op_errno);
-        nfs3_access_reply (cs->req, status, op_errno);
+        nfs3_access_reply (cs->req, status, op_errno, cs->accessbits);
         nfs3_call_state_wipe (cs);
 
         return 0;
@@ -1537,7 +1548,11 @@ nfs3_access_resume (void *carg)
         nfs_user_t              nfu = {0, };
         nfs3_call_state_t       *cs = NULL;
 
-        GF_VALIDATE_OR_GOTO (GF_NFS3, carg, nfs3err);
+        if (!carg) {
+                gf_log (GF_NFS3, GF_LOG_ERROR, "Invalid argument,"
+                        " carg value NULL");
+                return EINVAL;
+        }
 
         cs = (nfs3_call_state_t *)carg;
         nfs3_check_fh_resolve_status (cs, stat, nfs3err);
@@ -1552,7 +1567,7 @@ nfs3err:
         if (ret < 0) {
                 nfs3_log_common_res (rpcsvc_request_xid (cs->req), NFS3_ACCESS,
                                      stat, -ret);
-                nfs3_access_reply (cs->req, stat, 0);
+                nfs3_access_reply (cs->req, stat, 0, 0);
                 nfs3_call_state_wipe (cs);
                 ret = 0;
         }
@@ -1588,7 +1603,7 @@ nfs3err:
         if (ret < 0) {
                 nfs3_log_common_res (rpcsvc_request_xid (req), NFS3_ACCESS,
                                      stat, -ret);
-                nfs3_access_reply (req, stat, 0);
+                nfs3_access_reply (req, stat, 0, 0);
                 nfs3_call_state_wipe (cs);
                 ret = 0;
         }
@@ -1655,7 +1670,7 @@ nfs3svc_readlink_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                 gf_log (GF_NFS, GF_LOG_WARNING,
                         "%x: %s => -1 (%s)", rpcsvc_request_xid (cs->req),
                         cs->resolvedloc.path, strerror (op_errno));
-                stat = nfs3_errno_to_nfsstat3 (op_errno);
+                stat = nfs3_cbk_errno_status (op_ret, op_errno);
                 goto nfs3err;
         }
 
@@ -1822,7 +1837,7 @@ nfs3svc_read_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                 gf_log (GF_NFS, GF_LOG_WARNING,
                         "%x: %s => -1 (%s)", rpcsvc_request_xid (cs->req),
                         cs->resolvedloc.path, strerror (op_errno));
-                stat = nfs3_errno_to_nfsstat3 (op_errno);
+                stat = nfs3_cbk_errno_status (op_ret, op_errno);
                 goto err;
         } else
                 stat = NFS3_OK;
@@ -2008,7 +2023,7 @@ nfs3svc_write_fsync_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                 gf_log (GF_NFS, GF_LOG_WARNING,
                         "%x: %s => -1 (%s)", rpcsvc_request_xid (cs->req),
                         cs->resolvedloc.path, strerror (op_errno));
-                stat = nfs3_errno_to_nfsstat3 (op_errno);
+                stat = nfs3_cbk_errno_status (op_ret, op_errno);
         } else
                 stat = NFS3_OK;
 
@@ -2021,41 +2036,6 @@ nfs3svc_write_fsync_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
 }
 
 
-/*
- * If this logic determines that the write should return a reply to the client
- * after this function, the return value is -1 and the writetype is reset to
- * the type of write we want to signify to the client.
- *
- * In case the write should continue to serve the request according to the type
- * of stable write, a 0 is returned and writetype is left as it is.
- */
-int
-nfs3_write_how (int *writetype, int write_trusted, int sync_trusted)
-{
-        int     ret = -1;
-
-        if (*writetype == UNSTABLE) {
-                /* On an UNSTABLE write, only return STABLE when trusted-write
-                 * is set. TW is also set when trusted-sync is set.
-                 */
-                if (write_trusted)
-                        *writetype = FILE_SYNC;
-
-                goto err;
-        } else if ((*writetype == DATA_SYNC) || (*writetype == FILE_SYNC)) {
-
-                /* On a STABLE write, if sync-trusted is on, only then, return
-                 * without syncing.
-                 */
-                if (sync_trusted)
-                        goto err;
-        }
-
-        ret = 0;
-err:
-        return ret;
-}
-
 
 /*
  * Before going into the write reply logic, here is a matrix that shows the
@@ -2094,12 +2074,8 @@ nfs3svc_write_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                    struct iatt *postbuf, dict_t *xdata)
 {
         nfsstat3                stat = NFS3ERR_SERVERFAULT;
-        int                     ret = -EFAULT;
-        nfs_user_t              nfu = {0, };
         nfs3_call_state_t       *cs = NULL;
         struct nfs3_state       *nfs3 = NULL;
-        int                     write_trusted = 0;
-        int                     sync_trusted = 0;
 
         cs = frame->local;
         nfs3 = rpcsvc_request_program_private (cs->req);
@@ -2107,42 +2083,21 @@ nfs3svc_write_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                 gf_log (GF_NFS, GF_LOG_WARNING,
                         "%x: %s => -1 (%s)", rpcsvc_request_xid (cs->req),
                         cs->resolvedloc.path, strerror (op_errno));
-                stat = nfs3_errno_to_nfsstat3 (op_errno);
+                stat = nfs3_cbk_errno_status (op_ret, op_errno);
                 goto err;
         }
 
         stat = NFS3_OK;
         cs->maxcount = op_ret;
 
-        write_trusted = nfs3_export_write_trusted (cs->nfs3state,
-                                                   cs->resolvefh.exportid);
-        sync_trusted = nfs3_export_sync_trusted (cs->nfs3state,
-                                                 cs->resolvefh.exportid);
-        ret = nfs3_write_how (&cs->writetype, write_trusted, sync_trusted);
-        if (ret == -1)
-                goto err;
-
-        nfs_request_user_init (&nfu, cs->req);
-        /* Store the current preattr so that this can be used as the pre attr
-         * when fsync returns. We dont want to use the preattr in fsync because
-         * the write fop happened before the fsync.
-         */
-        cs->stbuf = *prebuf;
-        ret = nfs_fsync (cs->nfsx, cs->vol, &nfu, cs->fd, 0,
-                         nfs3svc_write_fsync_cbk, cs);
-        if (ret < 0)
-                stat = nfs3_errno_to_nfsstat3 (-ret);
-
 err:
-        if (ret < 0) {
-                nfs3_log_write_res (rpcsvc_request_xid (cs->req), stat,
-                                    op_errno, cs->maxcount, cs->writetype,
-                                    nfs3->serverstart);
-                nfs3_write_reply (cs->req, stat, cs->maxcount,
-                                  cs->writetype, nfs3->serverstart, prebuf,
-                                  postbuf);
-                nfs3_call_state_wipe (cs);
-        }
+	nfs3_log_write_res (rpcsvc_request_xid (cs->req), stat,
+			    op_errno, cs->maxcount, cs->writetype,
+			    nfs3->serverstart);
+	nfs3_write_reply (cs->req, stat, cs->maxcount,
+			  cs->writetype, nfs3->serverstart, prebuf,
+			  postbuf);
+	nfs3_call_state_wipe (cs);
 
         return 0;
 }
@@ -2198,6 +2153,25 @@ nfs3_write_resume (void *carg)
         }
 
         cs->fd = fd;    /* Gets unrefd when the call state is wiped. */
+
+/*
+  enum stable_how {
+  UNSTABLE = 0,
+  DATA_SYNC = 1,
+  FILE_SYNC = 2,
+  };
+*/
+	switch (cs->writetype) {
+	case UNSTABLE:
+		break;
+	case DATA_SYNC:
+		fd->flags |= O_DSYNC;
+		break;
+	case FILE_SYNC:
+		fd->flags |= O_SYNC;
+		break;
+	}
+
         ret = __nfs3_write_resume (cs);
         if (ret < 0)
                 stat = nfs3_errno_to_nfsstat3 (-ret);
@@ -2361,7 +2335,7 @@ nfs3svc_create_setattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                 gf_log (GF_NFS, GF_LOG_WARNING,
                         "%x: %s => -1 (%s)", rpcsvc_request_xid (cs->req),
                         cs->resolvedloc.path, strerror (op_errno));
-                stat = nfs3_errno_to_nfsstat3 (op_errno);
+                stat = nfs3_cbk_errno_status (op_ret, op_errno);
                 goto nfs3err;
         }
 
@@ -2394,7 +2368,7 @@ nfs3svc_create_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                 gf_log (GF_NFS, GF_LOG_WARNING,
                         "%x: %s => -1 (%s)", rpcsvc_request_xid (cs->req),
                         cs->resolvedloc.path, strerror (op_errno));
-                stat = nfs3_errno_to_nfsstat3 (op_errno);
+                stat = nfs3_cbk_errno_status (op_ret, op_errno);
                 goto nfs3err;
         }
 
@@ -2499,7 +2473,7 @@ nfs3svc_create_stat_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                         "%x: %s => -1 (%s)", rpcsvc_request_xid (cs->req),
                         cs->resolvedloc.path, strerror (op_errno));
                 ret = -op_errno;
-                stat = nfs3_errno_to_nfsstat3 (op_errno);
+                stat = nfs3_cbk_errno_status (op_ret, op_errno);
                 goto nfs3err;
         }
 
@@ -2670,13 +2644,7 @@ nfs3svc_create (rpcsvc_request_t *req)
         }
 
         cval = (uint64_t *)args.how.createhow3_u.verf;
-        if (cval)
-                cverf = *cval;
-        else {
-                gf_log(GF_NFS3, GF_LOG_ERROR,
-                       "Error getting createverf3 from args");
-                goto rpcerr;
-        }
+        cverf = *cval;
 
         ret = nfs3_create (req, &dirfh, name, args.how.mode,
                            &args.how.createhow3_u.obj_attributes, cverf);
@@ -2720,7 +2688,7 @@ nfs3svc_mkdir_setattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                 gf_log (GF_NFS, GF_LOG_WARNING,
                         "%x: %s => -1 (%s)", rpcsvc_request_xid (cs->req),
                         cs->resolvedloc.path, strerror (op_errno));
-                stat = nfs3_errno_to_nfsstat3 (op_errno);
+                stat = nfs3_cbk_errno_status (op_ret, op_errno);
                 goto nfs3err;
         }
 
@@ -2752,7 +2720,7 @@ nfs3svc_mkdir_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                 gf_log (GF_NFS, GF_LOG_WARNING,
                         "%x: %s => -1 (%s)", rpcsvc_request_xid (cs->req),
                         cs->resolvedloc.path, strerror (op_errno));
-                stat = nfs3_errno_to_nfsstat3 (op_errno);
+                stat = nfs3_cbk_errno_status (op_ret, op_errno);
                 goto nfs3err;
         }
 
@@ -2930,7 +2898,7 @@ nfs3svc_symlink_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                 gf_log (GF_NFS, GF_LOG_WARNING,
                         "%x: %s => -1 (%s)", rpcsvc_request_xid (cs->req),
                         cs->resolvedloc.path, strerror (op_errno));
-                stat = nfs3_errno_to_nfsstat3 (op_errno);
+                stat = nfs3_cbk_errno_status (op_ret, op_errno);
                 goto nfs3err;
         }
 
@@ -3092,7 +3060,7 @@ nfs3svc_mknod_setattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                 gf_log (GF_NFS, GF_LOG_WARNING,
                         "%x: %s => -1 (%s)", rpcsvc_request_xid (cs->req),
                         cs->resolvedloc.path, strerror (op_errno));
-                stat = nfs3_errno_to_nfsstat3 (op_errno);
+                stat = nfs3_cbk_errno_status (op_ret, op_errno);
                 goto nfs3err;
         }
 
@@ -3124,7 +3092,7 @@ nfs3svc_mknod_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                 gf_log (GF_NFS, GF_LOG_WARNING,
                         "%x: %s => -1 (%s)", rpcsvc_request_xid (cs->req),
                         cs->resolvedloc.path, strerror (op_errno));
-                stat = nfs3_errno_to_nfsstat3 (op_errno);
+                stat = nfs3_cbk_errno_status (op_ret, op_errno);
                 goto nfs3err;
         }
 
@@ -3382,7 +3350,7 @@ nfs3svc_remove_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                 gf_log (GF_NFS, GF_LOG_WARNING,
                         "%x: %s => -1 (%s)", rpcsvc_request_xid (cs->req),
                         cs->resolvedloc.path, strerror (op_errno));
-                stat = nfs3_errno_to_nfsstat3 (op_errno);
+                stat = nfs3_cbk_errno_status (op_ret, op_errno);
         }
 
         if (op_ret == 0)
@@ -3548,7 +3516,7 @@ nfs3svc_rmdir_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                 gf_log (GF_NFS, GF_LOG_WARNING,
                         "%x: %s => -1 (%s)", rpcsvc_request_xid (cs->req),
                         cs->resolvedloc.path, strerror (op_errno));
-                stat = nfs3_errno_to_nfsstat3 (op_errno);
+                stat = nfs3_cbk_errno_status (op_ret, op_errno);
         } else {
                 stat = NFS3_OK;
         }
@@ -3703,7 +3671,7 @@ nfs3svc_rename_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                         "%x: rename %s -> %s => -1 (%s)",
                         rpcsvc_request_xid (cs->req), cs->oploc.path,
                         cs->resolvedloc.path, strerror (op_errno));
-                stat = nfs3_errno_to_nfsstat3 (op_errno);
+                stat = nfs3_cbk_errno_status (op_ret, op_errno);
                 goto nfs3err;
         }
 
@@ -3908,7 +3876,7 @@ nfs3svc_link_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                         "%x: link %s <- %s => -1 (%s)",
                         rpcsvc_request_xid (cs->req), cs->oploc.path,
                         cs->resolvedloc.path, strerror (op_errno));
-                stat = nfs3_errno_to_nfsstat3 (op_errno);
+                stat = nfs3_cbk_errno_status (op_ret, op_errno);
         } else
                 stat = NFS3_OK;
 
@@ -4118,7 +4086,7 @@ nfs3svc_readdir_fstat_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                 gf_log (GF_NFS, GF_LOG_WARNING,
                         "%x: %s => -1 (%s)", rpcsvc_request_xid (cs->req),
                         cs->resolvedloc.path, strerror (op_errno));
-                stat = nfs3_errno_to_nfsstat3 (op_errno);
+                stat = nfs3_cbk_errno_status (op_ret, op_errno);
                 goto nfs3err;
         }
 
@@ -4173,7 +4141,7 @@ nfs3svc_readdir_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                 gf_log (GF_NFS, GF_LOG_WARNING,
                         "%x: %s => -1 (%s)", rpcsvc_request_xid (cs->req),
                         cs->resolvedloc.path, strerror (op_errno));
-                stat = nfs3_errno_to_nfsstat3 (op_errno);
+                stat = nfs3_cbk_errno_status (op_ret, op_errno);
                 goto err;
         }
 
@@ -4421,16 +4389,8 @@ nfs3svc_readdir (rpcsvc_request_t *req)
                 rpcsvc_request_seterr (req, GARBAGE_ARGS);
                 goto rpcerr;
         }
-
         cval = (uint64_t *) ra.cookieverf;
-
-        if (cval)
-                verf =  *cval;
-        else {
-                gf_log(GF_NFS3, GF_LOG_ERROR,
-                       "Error getting cookieverf from readdir args");
-                goto rpcerr;
-        }
+        verf =  *cval;
 
         ret = nfs3_readdir (req, &fh, ra.cookie, verf, ra.count, 0);
         if ((ret < 0) && (ret != RPCSVC_ACTOR_IGNORE)) {
@@ -4461,16 +4421,8 @@ nfs3svc_readdirp (rpcsvc_request_t *req)
                 rpcsvc_request_seterr (req, GARBAGE_ARGS);
                 goto rpcerr;
         }
-
         cval = (uint64_t *) ra.cookieverf;
-
-        if (cval)
-                cverf = *cval;
-        else {
-                gf_log (GF_NFS3, GF_LOG_ERROR,
-                        "Error getting cookieverf from readdirp args");
-                goto rpcerr;
-	}
+        cverf = *cval;
 
         ret = nfs3_readdir (req, &fh, ra.cookie, cverf, ra.dircount,
                             ra.maxcount);
@@ -4513,7 +4465,7 @@ nfs3_fsstat_stat_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                 gf_log (GF_NFS, GF_LOG_WARNING,
                         "%x: %s => -1 (%s)", rpcsvc_request_xid (cs->req),
                         cs->resolvedloc.path, strerror (op_errno));
-                stat = nfs3_errno_to_nfsstat3 (op_errno);
+                stat = nfs3_cbk_errno_status (op_ret, op_errno);
         } else
                 stat = NFS3_OK;
 
@@ -4541,7 +4493,7 @@ nfs3_fsstat_statfs_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                         "%x: %s => -1 (%s)", rpcsvc_request_xid (cs->req),
                         cs->resolvedloc.path, strerror (op_errno));
                 ret = -op_errno;
-                stat = nfs3_errno_to_nfsstat3 (op_errno);
+                stat = nfs3_cbk_errno_status (op_ret, op_errno);
                 goto err;
         }
 
@@ -4700,7 +4652,7 @@ nfs3svc_fsinfo_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                 gf_log (GF_NFS, GF_LOG_WARNING,
                         "%x: %s => -1 (%s)", rpcsvc_request_xid (cs->req),
                         cs->resolvedloc.path, strerror (op_errno));
-                status = nfs3_errno_to_nfsstat3 (op_errno);
+                status = nfs3_cbk_errno_status (op_ret, op_errno);
         }else
                 status = NFS3_OK;
 
@@ -4842,7 +4794,7 @@ nfs3svc_pathconf_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                 gf_log (GF_NFS, GF_LOG_WARNING,
                         "%x: %s => -1 (%s)", rpcsvc_request_xid (cs->req),
                         cs->resolvedloc.path, strerror (op_errno));
-                stat = nfs3_errno_to_nfsstat3 (op_errno);
+                stat = nfs3_cbk_errno_status (op_ret, op_errno);
         } else {
                 /* If stat fop failed, we can still send the other components
                  * in a pathconf reply.
@@ -4986,7 +4938,7 @@ nfs3svc_commit_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                 gf_log (GF_NFS, GF_LOG_WARNING,
                         "%x: %s => -1 (%s)", rpcsvc_request_xid (cs->req),
                         cs->resolvedloc.path, strerror (op_errno));
-                stat = nfs3_errno_to_nfsstat3 (op_errno);
+                stat = nfs3_cbk_errno_status (op_ret, op_errno);
         } else
                 stat = NFS3_OK;
 
@@ -5147,28 +5099,28 @@ rpcerr:
 
 
 rpcsvc_actor_t          nfs3svc_actors[NFS3_PROC_COUNT] = {
-        {"NULL",        NFS3_NULL,      nfs3svc_null,   NULL,   0},
-        {"GETATTR",     NFS3_GETATTR,   nfs3svc_getattr,NULL,   0},
-        {"SETATTR",     NFS3_SETATTR,   nfs3svc_setattr,NULL,   0},
-        {"LOOKUP",      NFS3_LOOKUP,    nfs3svc_lookup, NULL,   0},
-        {"ACCESS",      NFS3_ACCESS,    nfs3svc_access, NULL,   0},
-        {"READLINK",    NFS3_READLINK,  nfs3svc_readlink,NULL,  0},
-        {"READ",        NFS3_READ,      nfs3svc_read,   NULL,   0},
-        {"WRITE",       NFS3_WRITE,     nfs3svc_write, nfs3svc_write_vecsizer, 0},
-        {"CREATE",      NFS3_CREATE,    nfs3svc_create, NULL,   0},
-        {"MKDIR",       NFS3_MKDIR,     nfs3svc_mkdir,  NULL,   0},
-        {"SYMLINK",     NFS3_SYMLINK,   nfs3svc_symlink,NULL,   0},
-        {"MKNOD",       NFS3_MKNOD,     nfs3svc_mknod,  NULL,   0},
-        {"REMOVE",      NFS3_REMOVE,    nfs3svc_remove, NULL,   0},
-        {"RMDIR",       NFS3_RMDIR,     nfs3svc_rmdir,  NULL,   0},
-        {"RENAME",      NFS3_RENAME,    nfs3svc_rename, NULL,   0},
-        {"LINK",        NFS3_LINK,      nfs3svc_link,   NULL,   0},
-        {"READDIR",     NFS3_READDIR,   nfs3svc_readdir,NULL,   0},
-        {"READDIRPLUS", NFS3_READDIRP,  nfs3svc_readdirp,NULL,  0},
-        {"FSSTAT",      NFS3_FSSTAT,    nfs3svc_fsstat, NULL,   0},
-        {"FSINFO",      NFS3_FSINFO,    nfs3svc_fsinfo, NULL,   0},
-        {"PATHCONF",    NFS3_PATHCONF,  nfs3svc_pathconf,NULL,  0},
-        {"COMMIT",      NFS3_COMMIT,    nfs3svc_commit, NULL,   0}
+        {"NULL",        NFS3_NULL,      nfs3svc_null,      NULL,   0, DRC_IDEMPOTENT},
+        {"GETATTR",     NFS3_GETATTR,   nfs3svc_getattr,   NULL,   0, DRC_IDEMPOTENT},
+        {"SETATTR",     NFS3_SETATTR,   nfs3svc_setattr,   NULL,   0, DRC_NON_IDEMPOTENT},
+        {"LOOKUP",      NFS3_LOOKUP,    nfs3svc_lookup,    NULL,   0, DRC_IDEMPOTENT},
+        {"ACCESS",      NFS3_ACCESS,    nfs3svc_access,    NULL,   0, DRC_IDEMPOTENT},
+        {"READLINK",    NFS3_READLINK,  nfs3svc_readlink,  NULL,   0, DRC_IDEMPOTENT},
+        {"READ",        NFS3_READ,      nfs3svc_read,      NULL,   0, DRC_IDEMPOTENT},
+        {"WRITE",       NFS3_WRITE,     nfs3svc_write,     nfs3svc_write_vecsizer, 0, DRC_NON_IDEMPOTENT},
+        {"CREATE",      NFS3_CREATE,    nfs3svc_create,    NULL,   0, DRC_NON_IDEMPOTENT},
+        {"MKDIR",       NFS3_MKDIR,     nfs3svc_mkdir,     NULL,   0, DRC_NON_IDEMPOTENT},
+        {"SYMLINK",     NFS3_SYMLINK,   nfs3svc_symlink,   NULL,   0, DRC_NON_IDEMPOTENT},
+        {"MKNOD",       NFS3_MKNOD,     nfs3svc_mknod,     NULL,   0, DRC_NON_IDEMPOTENT},
+        {"REMOVE",      NFS3_REMOVE,    nfs3svc_remove,    NULL,   0, DRC_NON_IDEMPOTENT},
+        {"RMDIR",       NFS3_RMDIR,     nfs3svc_rmdir,     NULL,   0, DRC_NON_IDEMPOTENT},
+        {"RENAME",      NFS3_RENAME,    nfs3svc_rename,    NULL,   0, DRC_NON_IDEMPOTENT},
+        {"LINK",        NFS3_LINK,      nfs3svc_link,      NULL,   0, DRC_NON_IDEMPOTENT},
+        {"READDIR",     NFS3_READDIR,   nfs3svc_readdir,   NULL,   0, DRC_IDEMPOTENT},
+        {"READDIRPLUS", NFS3_READDIRP,  nfs3svc_readdirp,  NULL,   0, DRC_IDEMPOTENT},
+        {"FSSTAT",      NFS3_FSSTAT,    nfs3svc_fsstat,    NULL,   0, DRC_IDEMPOTENT},
+        {"FSINFO",      NFS3_FSINFO,    nfs3svc_fsinfo,    NULL,   0, DRC_IDEMPOTENT},
+        {"PATHCONF",    NFS3_PATHCONF,  nfs3svc_pathconf,  NULL,   0, DRC_IDEMPOTENT},
+        {"COMMIT",      NFS3_COMMIT,    nfs3svc_commit,    NULL,   0, DRC_IDEMPOTENT}
 };
 
 
@@ -5185,21 +5137,48 @@ rpcsvc_program_t        nfs3prog = {
                         .min_auth       = AUTH_NULL,
 };
 
+/*
+ * This function rounds up the input value to multiple of 4096. Min and Max
+ * supported I/O size limits are 4KB (GF_NFS3_FILE_IO_SIZE_MIN) and
+ * 1MB (GF_NFS3_FILE_IO_SIZE_MAX).
+ */
+void
+nfs3_iosize_roundup_4KB (uint64_t *ioszptr)
+{
+        uint64_t iosize;
+        uint64_t iopages;
+
+        if (!ioszptr)
+                return;
+
+        iosize  = *ioszptr;
+        iopages = (iosize + GF_NFS3_IO_SIZE -1) >> GF_NFS3_IO_SHIFT;
+        iosize  = (iopages * GF_NFS3_IO_SIZE);
+
+        /* Double check - boundary conditions */
+        if (iosize < GF_NFS3_FILE_IO_SIZE_MIN) {
+                iosize = GF_NFS3_FILE_IO_SIZE_MIN;
+        } else if (iosize > GF_NFS3_FILE_IO_SIZE_MAX) {
+                iosize = GF_NFS3_FILE_IO_SIZE_MAX;
+        }
+
+        *ioszptr = iosize;
+}
 
 int
-nfs3_init_options (struct nfs3_state *nfs3, xlator_t *nfsx)
+nfs3_init_options (struct nfs3_state *nfs3, dict_t *options)
 {
         int      ret = -1;
         char     *optstr = NULL;
         uint64_t size64 = 0;
 
-        if ((!nfs3) || (!nfsx))
+        if ((!nfs3) || (!options))
                 return -1;
 
         /* nfs3.read-size */
         nfs3->readsize = GF_NFS3_RTPREF;
-        if (dict_get (nfsx->options, "nfs3.read-size")) {
-                ret = dict_get_str (nfsx->options, "nfs3.read-size", &optstr);
+        if (dict_get (options, "nfs3.read-size")) {
+                ret = dict_get_str (options, "nfs3.read-size", &optstr);
                 if (ret < 0) {
                         gf_log (GF_NFS3, GF_LOG_ERROR, "Failed to read "
                                 " option: nfs3.read-size");
@@ -5208,19 +5187,21 @@ nfs3_init_options (struct nfs3_state *nfs3, xlator_t *nfsx)
                 }
 
                 ret = gf_string2bytesize (optstr, &size64);
-                nfs3->readsize = size64;
                 if (ret == -1) {
                         gf_log (GF_NFS3, GF_LOG_ERROR, "Failed to format"
                                 " option: nfs3.read-size");
                         ret = -1;
                         goto err;
                 }
+
+                nfs3_iosize_roundup_4KB (&size64);
+                nfs3->readsize = size64;
         }
 
         /* nfs3.write-size */
         nfs3->writesize = GF_NFS3_WTPREF;
-        if (dict_get (nfsx->options, "nfs3.write-size")) {
-                ret = dict_get_str (nfsx->options, "nfs3.write-size", &optstr);
+        if (dict_get (options, "nfs3.write-size")) {
+                ret = dict_get_str (options, "nfs3.write-size", &optstr);
                 if (ret < 0) {
                         gf_log (GF_NFS3, GF_LOG_ERROR, "Failed to read "
                                 " option: nfs3.write-size");
@@ -5229,19 +5210,21 @@ nfs3_init_options (struct nfs3_state *nfs3, xlator_t *nfsx)
                 }
 
                 ret = gf_string2bytesize (optstr, &size64);
-                nfs3->writesize = size64;
                 if (ret == -1) {
                         gf_log (GF_NFS3, GF_LOG_ERROR, "Failed to format"
                                 " option: nfs3.write-size");
                         ret = -1;
                         goto err;
                 }
+
+                nfs3_iosize_roundup_4KB (&size64);
+                nfs3->writesize = size64;
         }
 
         /* nfs3.readdir.size */
         nfs3->readdirsize = GF_NFS3_DTPREF;
-        if (dict_get (nfsx->options, "nfs3.readdir-size")) {
-                ret = dict_get_str (nfsx->options,"nfs3.readdir-size", &optstr);
+        if (dict_get (options, "nfs3.readdir-size")) {
+                ret = dict_get_str (options,"nfs3.readdir-size", &optstr);
                 if (ret < 0) {
                         gf_log (GF_NFS3, GF_LOG_ERROR, "Failed to read"
                                 " option: nfs3.readdir-size");
@@ -5250,15 +5233,16 @@ nfs3_init_options (struct nfs3_state *nfs3, xlator_t *nfsx)
                 }
 
                 ret = gf_string2bytesize (optstr, &size64);
-                nfs3->readdirsize = size64;
                 if (ret == -1) {
                         gf_log (GF_NFS3, GF_LOG_ERROR, "Failed to format"
                                 " option: nfs3.readdir-size");
                         ret = -1;
                         goto err;
                 }
-        }
 
+                nfs3_iosize_roundup_4KB (&size64);
+                nfs3->readdirsize = size64;
+        }
 
         /* We want to use the size of the biggest param for the io buffer size.
          */
@@ -5279,9 +5263,10 @@ err:
         return ret;
 }
 
-
 int
-nfs3_init_subvolume_options (struct nfs3_state *nfs3, struct nfs3_export *exp)
+nfs3_init_subvolume_options (xlator_t *nfsx,
+                             struct nfs3_export *exp,
+                             dict_t *options)
 {
         int             ret = -1;
         char            *optstr = NULL;
@@ -5289,14 +5274,20 @@ nfs3_init_subvolume_options (struct nfs3_state *nfs3, struct nfs3_export *exp)
         char            *name = NULL;
         gf_boolean_t    boolt = _gf_false;
         uuid_t          volumeid = {0, };
-        dict_t          *options = NULL;
 
-        if ((!exp) || (!nfs3))
+        if ((!nfsx) || (!exp))
                 return -1;
 
-        options = nfs3->nfsx->options;
+        /* For init, fetch options from xlator but for
+         * reconfigure, take the parameter */
+        if (!options)
+                options = nfsx->options;
+
+        if (!options)
+                return (-1);
+
         uuid_clear (volumeid);
-        if (gf_nfs_dvm_off (nfs_state (nfs3->nfsx)))
+        if (gf_nfs_dvm_off (nfs_state (nfsx)))
                 goto no_dvm;
 
         ret = snprintf (searchkey, 1024, "nfs3.%s.volume-id",exp->subvol->name);
@@ -5462,7 +5453,7 @@ nfs3_init_subvolume (struct nfs3_state *nfs3, xlator_t *subvol)
         INIT_LIST_HEAD (&exp->explist);
         gf_log (GF_NFS3, GF_LOG_TRACE, "Initing state: %s", exp->subvol->name);
 
-        ret = nfs3_init_subvolume_options (nfs3, exp);
+        ret = nfs3_init_subvolume_options (nfs3->nfsx, exp, NULL);
         if (ret == -1) {
                 gf_log (GF_NFS3, GF_LOG_ERROR, "Failed to init subvol");
                 goto exp_free;
@@ -5527,7 +5518,7 @@ nfs3_init_state (xlator_t *nfsx)
         }
 
         nfs = nfsx->private;
-        ret = nfs3_init_options (nfs3, nfsx);
+        ret = nfs3_init_options (nfs3, nfsx->options);
         if (ret == -1) {
                 gf_log (GF_NFS3, GF_LOG_ERROR, "Failed to init options");
                 goto ret;
@@ -5559,7 +5550,7 @@ nfs3_init_state (xlator_t *nfsx)
         LOCK_INIT (&nfs3->fdlrulock);
         nfs3->fdcount = 0;
 
-        rpcsvc_create_listeners (nfs->rpcsvc, nfsx->options, nfsx->name);
+        ret = rpcsvc_create_listeners (nfs->rpcsvc, nfsx->options, nfsx->name);
         if (ret == -1) {
                 gf_log (GF_NFS, GF_LOG_ERROR, "Unable to create listeners");
                 goto free_localpool;
@@ -5601,4 +5592,39 @@ nfs3svc_init (xlator_t *nfsx)
         return &nfs3prog;
 }
 
+int
+nfs3_reconfigure_state (xlator_t *nfsx, dict_t *options)
+{
+        int                   ret   = -1;
+        struct nfs3_export    *exp  = NULL;
+        struct nfs_state      *nfs  = NULL;
+        struct nfs3_state     *nfs3 = NULL;
+
+        if ((!nfsx) || (!nfsx->private) || (!options))
+                goto out;
 
+        nfs = (struct nfs_state *)nfsx->private;
+        nfs3 = nfs->nfs3state;
+        if (!nfs3)
+                goto out;
+
+        ret = nfs3_init_options (nfs3, options);
+        if (ret) {
+                gf_log (GF_NFS3, GF_LOG_ERROR,
+                        "Failed to reconfigure options");
+                goto out;
+        }
+
+        list_for_each_entry (exp, &nfs3->exports, explist) {
+                ret = nfs3_init_subvolume_options (nfsx, exp, options);
+                if (ret) {
+                        gf_log (GF_NFS3, GF_LOG_ERROR,
+                                "Failed to reconfigure subvol options");
+                        goto out;
+                }
+        }
+
+        ret = 0;
+out:
+        return ret;
+}
diff --git a/xlators/nfs/server/src/nfs3.h b/xlators/nfs/server/src/nfs3.h
index 111542bc6..0c35445a4 100644
--- a/xlators/nfs/server/src/nfs3.h
+++ b/xlators/nfs/server/src/nfs3.h
@@ -2,19 +2,10 @@
   Copyright (c) 2010-2011 Gluster, Inc. <http://www.gluster.com>
   This file is part of GlusterFS.
 
-  GlusterFS is free software; you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published
-  by the Free Software Foundation; either version 3 of the License,
-  or (at your option) any later version.
-
-  GlusterFS is distributed in the hope that it will be useful, but
-  WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-  General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see
-  <http://www.gnu.org/licenses/>.
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
 */
 
 #ifndef _NFS3_H_
@@ -48,16 +39,39 @@
 
 
 /* Static values used for FSINFO
-FIXME: This should be configurable */
-#define GF_NFS3_RTMAX      (64 * GF_UNIT_KB)
-#define GF_NFS3_RTPREF     (64 * GF_UNIT_KB)
-#define GF_NFS3_RTMULT     (4 * GF_UNIT_KB)
-#define GF_NFS3_WTMAX      (64 * GF_UNIT_KB)
-#define GF_NFS3_WTPREF     (64 * GF_UNIT_KB)
-#define GF_NFS3_WTMULT     (4 * GF_UNIT_KB)
-#define GF_NFS3_DTMIN      (4 * GF_UNIT_KB)
-#define GF_NFS3_DTPREF     (64 * GF_UNIT_KB)
-#define GF_NFS3_MAXFILE    (1 * GF_UNIT_PB)
+ * To change the maximum rsize and wsize supported by the NFS client, adjust
+ * GF_NFS3_FILE_IO_SIZE_MAX. The Gluster NFS server defaults to 1MB(1048576)
+ * (same as kernel NFS server). For slower network, rsize/wsize can be trimmed
+ * to 16/32/64-KB. rsize and wsize can be tuned through nfs.read-size and
+ * nfs.write-size respectively.
+ *
+ * NB: For Kernel-NFS, NFS_MAX_FILE_IO_SIZE is 1048576U (1MB).
+ */
+#define GF_NFS3_FILE_IO_SIZE_MAX     (1  * GF_UNIT_MB) /* 1048576 */
+#define GF_NFS3_FILE_IO_SIZE_MIN     (4  * GF_UNIT_KB) /* 4096 */
+
+#define GF_NFS3_FILE_IO_SIZE_DEF     GF_NFS3_FILE_IO_SIZE_MAX
+
+#define GF_NFS3_RTMAX          GF_NFS3_FILE_IO_SIZE_MAX
+#define GF_NFS3_RTMIN          GF_NFS3_FILE_IO_SIZE_MIN
+#define GF_NFS3_RTPREF         GF_NFS3_FILE_IO_SIZE_DEF
+#define GF_NFS3_RTMULT         GF_NFS3_FILE_IO_SIZE_MIN
+
+#define GF_NFS3_WTMAX          GF_NFS3_FILE_IO_SIZE_MAX
+#define GF_NFS3_WTMIN          GF_NFS3_FILE_IO_SIZE_MIN
+#define GF_NFS3_WTPREF         GF_NFS3_FILE_IO_SIZE_DEF
+#define GF_NFS3_WTMULT         GF_NFS3_FILE_IO_SIZE_MIN
+
+/* This can be tuned through nfs.readdir-size */
+#define GF_NFS3_DTMAX          GF_NFS3_FILE_IO_SIZE_MAX
+#define GF_NFS3_DTMIN          GF_NFS3_FILE_IO_SIZE_MIN
+#define GF_NFS3_DTPREF         GF_NFS3_FILE_IO_SIZE_DEF
+
+#define GF_NFS3_MAXFILESIZE    (1 * GF_UNIT_PB)
+
+#define GF_NFS3_IO_SIZE        4096 /* 4-KB */
+#define GF_NFS3_IO_SHIFT       12   /* 2^12 = 4KB */
+
 /* FIXME: Handle time resolutions */
 #define GF_NFS3_TIMEDELTA_SECS     {1,0}
 #define GF_NFS3_TIMEDELTA_NSECS    {0,1}
@@ -120,20 +134,21 @@ typedef struct nfs3_state {
         uint64_t                serverstart;
 
         /* NFSv3 Protocol configurables */
-        size_t                  readsize;
-        size_t                  writesize;
-        size_t                  readdirsize;
+        uint64_t                readsize;
+        uint64_t                writesize;
+        uint64_t                readdirsize;
 
         /* Size of the iobufs used, depends on the sizes of the three params
          * above.
          */
-        size_t                  iobsize;
+        uint64_t                iobsize;
 
         unsigned int            memfactor;
 
         struct list_head        fdlru;
         gf_lock_t               fdlrulock;
         int                     fdcount;
+        uint32_t                occ_logger;
 } nfs3_state_t;
 
 typedef enum nfs3_lookup_type {
@@ -262,9 +277,9 @@ struct inode_op_queue {
         pthread_mutex_t         qlock;
 };
 
-
-
-
 extern rpcsvc_program_t *
 nfs3svc_init (xlator_t *nfsx);
+
+extern int
+nfs3_reconfigure_state (xlator_t *nfsx, dict_t *options);
 #endif
diff --git a/xlators/nfs/server/src/nlm4.c b/xlators/nfs/server/src/nlm4.c
index 595738b2c..5c5d87412 100644
--- a/xlators/nfs/server/src/nlm4.c
+++ b/xlators/nfs/server/src/nlm4.c
@@ -2,19 +2,10 @@
   Copyright (c) 2012 Gluster, Inc. <http://www.gluster.com>
   This file is part of GlusterFS.
 
-  GlusterFS is free software; you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published
-  by the Free Software Foundation; either version 3 of the License,
-  or (at your option) any later version.
-
-  GlusterFS is distributed in the hope that it will be useful, but
-  WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-  General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see
-  <http://www.gnu.org/licenses/>.
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
 */
 
 #ifndef _CONFIG_H
@@ -149,8 +140,10 @@ nfs3_fh_to_xlator (struct nfs3_state *nfs3, struct nfs3_fh *fh);
                         xlatorp = nfs3_fh_to_xlator (cst->nfs3state,    \
                                                      &cst->resolvefh);  \
                         uuid_unparse (cst->resolvefh.gfid, gfid);       \
-                        sprintf (buf, "(%s) %s : %s", trans->peerinfo.identifier,\
-                        xlatorp ? xlatorp->name : "ERR", gfid);         \
+                        snprintf (buf, sizeof (buf), "(%s) %s : %s",             \
+                                  trans->peerinfo.identifier,           \
+                                  xlatorp ? xlatorp->name : "ERR",      \
+                                  gfid);                                \
                         gf_log (GF_NLM, GF_LOG_ERROR, "Unable to resolve FH"\
                                 ": %s", buf);                           \
                         nfstat = nlm4_errno_to_nlm4stat (cst->resolve_errno);\
@@ -235,7 +228,7 @@ nlm_is_oh_same_lkowner (gf_lkowner_t *a, netobj *b)
                 !memcmp (a->data, b->n_bytes, a->len));
 }
 
-nfsstat3
+nlm4_stats
 nlm4_errno_to_nlm4stat (int errnum)
 {
         nlm4_stats        stat = nlm4_denied;
@@ -434,10 +427,11 @@ ret:
 int
 nlm4svc_submit_reply (rpcsvc_request_t *req, void *arg, nlm4_serializer sfunc)
 {
-        struct iovec            outmsg = {0, };
-        struct iobuf            *iob = NULL;
-        struct nfs3_state       *nfs3 = NULL;
-        int                     ret = -1;
+        struct iovec            outmsg  = {0, };
+        struct iobuf            *iob    = NULL;
+        struct nfs3_state       *nfs3   = NULL;
+        int                     ret     = -1;
+        ssize_t                 msglen  = 0;
         struct iobref           *iobref = NULL;
 
         if (!req)
@@ -462,7 +456,12 @@ nlm4svc_submit_reply (rpcsvc_request_t *req, void *arg, nlm4_serializer sfunc)
         /* Use the given serializer to translate the give C structure in arg
          * to XDR format which will be written into the buffer in outmsg.
          */
-        outmsg.iov_len = sfunc (outmsg, arg);
+        msglen = sfunc (outmsg, arg);
+        if (msglen < 0) {
+                gf_log (GF_NLM, GF_LOG_ERROR, "Failed to encode message");
+                goto ret;
+        }
+        outmsg.iov_len = msglen;
 
         iobref = iobref_new ();
         if (iobref == NULL) {
@@ -470,7 +469,11 @@ nlm4svc_submit_reply (rpcsvc_request_t *req, void *arg, nlm4_serializer sfunc)
                 goto ret;
         }
 
-        iobref_add (iobref, iob);
+        ret = iobref_add (iobref, iob);
+        if (ret) {
+                gf_log (GF_NLM, GF_LOG_ERROR, "Failed to add iob to iobref");
+                goto ret;
+        }
 
         /* Then, submit the message for transmission. */
         ret = rpcsvc_submit_message (req, &outmsg, 1, NULL, 0, iobref);
@@ -956,7 +959,7 @@ nlm4_establish_callback (void *csarg)
         case AF_INET:
                 inet_ntop (AF_INET, &sock_union.sin.sin_addr, peerip,
                            INET6_ADDRSTRLEN+1);
-                inet_ntop (AF_INET, &(((struct sockaddr_in *)&cs->req->trans->myinfo.sockaddr)->sin_addr),
+                inet_ntop (AF_INET, &(((struct sockaddr_in *)&cs->trans->myinfo.sockaddr)->sin_addr),
                            myip, INET6_ADDRSTRLEN + 1);
 
                 break;
@@ -1094,7 +1097,11 @@ nlm4svc_send_granted (nfs3_call_state_t *cs)
                 goto ret;
         }
 
-        iobref_add (iobref, iobuf);
+        ret = iobref_add (iobref, iobuf);
+        if (ret) {
+                gf_log (GF_NLM, GF_LOG_ERROR, "Failed to add iob to iobref");
+                goto ret;
+        }
 
         ret = rpc_clnt_submit (rpc_clnt, &nlm4clntprog, NLM4_GRANTED,
                                nlm4svc_send_granted_cbk, &outmsg, 1,
@@ -1814,7 +1821,7 @@ nlm4_add_share_to_inode (nlm_share_t *share)
         inode = share->inode;
         ret = inode_ctx_get (inode, this, &ctx);
 
-        if (ret || !head) {
+        if (ret == -1) {
                 ictx = GF_CALLOC (1, sizeof (struct nfs_inode_ctx),
                                   gf_nfs_mt_inode_ctx);
                 if (!ictx ) {
@@ -2286,34 +2293,34 @@ nlm4svc_sm_notify (struct nlm_sm_status *status)
 
 rpcsvc_actor_t  nlm4svc_actors[NLM4_PROC_COUNT] = {
         /* 0 */
-        {"NULL",       NLM4_NULL,         nlm4svc_null,      NULL},
-        {"TEST",       NLM4_TEST,         nlm4svc_test,      NULL},
-        {"LOCK",       NLM4_LOCK,         nlm4svc_lock,      NULL},
-        {"CANCEL",     NLM4_CANCEL,       nlm4svc_cancel,    NULL},
-        {"UNLOCK",     NLM4_UNLOCK,       nlm4svc_unlock,    NULL},
+        {"NULL",       NLM4_NULL,         nlm4svc_null,      NULL, 0, DRC_IDEMPOTENT},
+        {"TEST",       NLM4_TEST,         nlm4svc_test,      NULL, 0, DRC_IDEMPOTENT},
+        {"LOCK",       NLM4_LOCK,         nlm4svc_lock,      NULL, 0, DRC_NON_IDEMPOTENT},
+        {"CANCEL",     NLM4_CANCEL,       nlm4svc_cancel,    NULL, 0, DRC_NON_IDEMPOTENT},
+        {"UNLOCK",     NLM4_UNLOCK,       nlm4svc_unlock,    NULL, 0, DRC_NON_IDEMPOTENT},
         /* 5 */
-        {"GRANTED",    NLM4_GRANTED,      NULL,              NULL},
-        {"TEST",       NLM4_TEST_MSG,     NULL,              NULL},
-        {"LOCK",       NLM4_LOCK_MSG,     NULL,              NULL},
-        {"CANCEL",     NLM4_CANCEL_MSG,   NULL,              NULL},
-        {"UNLOCK",     NLM4_UNLOCK_MSG,   NULL,              NULL},
+        {"GRANTED",    NLM4_GRANTED,      NULL,              NULL, 0, DRC_NA},
+        {"TEST",       NLM4_TEST_MSG,     NULL,              NULL, 0, DRC_NA},
+        {"LOCK",       NLM4_LOCK_MSG,     NULL,              NULL, 0, DRC_NA},
+        {"CANCEL",     NLM4_CANCEL_MSG,   NULL,              NULL, 0, DRC_NA},
+        {"UNLOCK",     NLM4_UNLOCK_MSG,   NULL,              NULL, 0, DRC_NA},
         /* 10 */
-        {"GRANTED",    NLM4_GRANTED_MSG,  NULL,              NULL},
-        {"TEST",       NLM4_TEST_RES,     NULL,              NULL},
-        {"LOCK",       NLM4_LOCK_RES,     NULL,              NULL},
-        {"CANCEL",     NLM4_CANCEL_RES,   NULL,              NULL},
-        {"UNLOCK",     NLM4_UNLOCK_RES,   NULL,              NULL},
+        {"GRANTED",    NLM4_GRANTED_MSG,  NULL,              NULL, 0, DRC_NA},
+        {"TEST",       NLM4_TEST_RES,     NULL,              NULL, 0, DRC_NA},
+        {"LOCK",       NLM4_LOCK_RES,     NULL,              NULL, 0, DRC_NA},
+        {"CANCEL",     NLM4_CANCEL_RES,   NULL,              NULL, 0, DRC_NA},
+        {"UNLOCK",     NLM4_UNLOCK_RES,   NULL,              NULL, 0, DRC_NA},
         /* 15 ; procedures 17,18,19 are not defined by nlm */
-        {"GRANTED",    NLM4_GRANTED_RES,  NULL,              NULL},
-        {"SM_NOTIFY",  NLM4_SM_NOTIFY,    NULL,              NULL},
-        {"SEVENTEEN",  NLM4_SEVENTEEN,    NULL,              NULL},
-        {"EIGHTEEN",   NLM4_EIGHTEEN,     NULL,              NULL},
-        {"NINETEEN",   NLM4_NINETEEN,     NULL,              NULL},
+        {"GRANTED",    NLM4_GRANTED_RES,  NULL,              NULL, 0, DRC_NA},
+        {"SM_NOTIFY",  NLM4_SM_NOTIFY,    NULL,              NULL, 0, DRC_NA},
+        {"SEVENTEEN",  NLM4_SEVENTEEN,    NULL,              NULL, 0, DRC_NA},
+        {"EIGHTEEN",   NLM4_EIGHTEEN,     NULL,              NULL, 0, DRC_NA},
+        {"NINETEEN",   NLM4_NINETEEN,     NULL,              NULL, 0, DRC_NA},
         /* 20 */
-        {"SHARE",      NLM4_SHARE,        nlm4svc_share,     NULL},
-        {"UNSHARE",    NLM4_UNSHARE,      nlm4svc_unshare,   NULL},
-        {"NM_LOCK",    NLM4_NM_LOCK,      nlm4svc_nm_lock,   NULL},
-        {"FREE_ALL",   NLM4_FREE_ALL,     nlm4svc_free_all,  NULL},
+        {"SHARE",      NLM4_SHARE,        nlm4svc_share,     NULL, 0, DRC_NON_IDEMPOTENT},
+        {"UNSHARE",    NLM4_UNSHARE,      nlm4svc_unshare,   NULL, 0, DRC_NON_IDEMPOTENT},
+        {"NM_LOCK",    NLM4_NM_LOCK,      nlm4svc_nm_lock,   NULL, 0, DRC_NON_IDEMPOTENT},
+        {"FREE_ALL",   NLM4_FREE_ALL,     nlm4svc_free_all,  NULL, 0, DRC_IDEMPOTENT},
 };
 
 rpcsvc_program_t        nlm4prog = {
@@ -2349,9 +2356,14 @@ nlm4svc_init(xlator_t *nfsx)
         int ret = -1;
         char *portstr = NULL;
         pthread_t thr;
-        struct timeval timeout = {0,};
+        struct timespec timeout = {0,};
         FILE   *pidfile = NULL;
         pid_t   pid     = -1;
+        static gf_boolean_t nlm4_inited = _gf_false;
+
+        /* Already inited */
+        if (nlm4_inited)
+                return &nlm4prog;
 
         nfs = (struct nfs_state*)nfsx->private;
 
@@ -2397,7 +2409,7 @@ nlm4svc_init(xlator_t *nfsx)
                 goto err;
         }
 
-        rpcsvc_create_listeners (nfs->rpcsvc, options, "NLM");
+        ret = rpcsvc_create_listeners (nfs->rpcsvc, options, "NLM");
         if (ret == -1) {
                 gf_log (GF_NLM, GF_LOG_ERROR, "Unable to create listeners");
                 dict_unref (options);
@@ -2453,7 +2465,10 @@ nlm4svc_init(xlator_t *nfsx)
         pthread_create (&thr, NULL, nsm_thread, (void*)NULL);
 
         timeout.tv_sec = nlm_grace_period;
+        timeout.tv_nsec = 0;
+
         gf_timer_call_after (nfsx->ctx, timeout, nlm_grace_period_over, NULL);
+        nlm4_inited = _gf_true;
         return &nlm4prog;
 err:
         return NULL;
diff --git a/xlators/nfs/server/src/nlm4.h b/xlators/nfs/server/src/nlm4.h
index 4659915aa..9b5d54081 100644
--- a/xlators/nfs/server/src/nlm4.h
+++ b/xlators/nfs/server/src/nlm4.h
@@ -2,19 +2,10 @@
   Copyright (c) 2012 Gluster, Inc. <http://www.gluster.com>
   This file is part of GlusterFS.
 
-  GlusterFS is free software; you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published
-  by the Free Software Foundation; either version 3 of the License,
-  or (at your option) any later version.
-
-  GlusterFS is distributed in the hope that it will be useful, but
-  WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-  General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see
-  <http://www.gnu.org/licenses/>.
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
 */
 
 #ifndef _NLM4_H_
diff --git a/xlators/nfs/server/src/nlmcbk_svc.c b/xlators/nfs/server/src/nlmcbk_svc.c
index 5401dc39b..e1b588765 100644
--- a/xlators/nfs/server/src/nlmcbk_svc.c
+++ b/xlators/nfs/server/src/nlmcbk_svc.c
@@ -2,19 +2,10 @@
   Copyright (c) 2012 Gluster, Inc. <http://www.gluster.com>
   This file is part of GlusterFS.
 
-  GlusterFS is free software; you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published
-  by the Free Software Foundation; either version 3 of the License,
-  or (at your option) any later version.
-
-  GlusterFS is distributed in the hope that it will be useful, but
-  WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-  General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see
-  <http://www.gnu.org/licenses/>.
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
 */
 
 /*
@@ -92,10 +83,14 @@ void *
 nsm_thread (void *argv)
 {
 	register SVCXPRT *transp;
+        int ret = 0;
 
-	pmap_unset (NLMCBK_PROGRAM, NLMCBK_V1);
-
-	transp = svcudp_create(RPC_ANYSOCK);
+        ret = pmap_unset (NLMCBK_PROGRAM, NLMCBK_V1);
+        if (ret == 0) {
+                gf_log (GF_NLM, GF_LOG_ERROR, "pmap_unset failed");
+                return NULL;
+        }
+        transp = svcudp_create(RPC_ANYSOCK);
 	if (transp == NULL) {
 		gf_log (GF_NLM, GF_LOG_ERROR, "cannot create udp service.");
                 return NULL;
diff --git a/xlators/performance/Makefile.am b/xlators/performance/Makefile.am
index f99e11829..a494190ba 100644
--- a/xlators/performance/Makefile.am
+++ b/xlators/performance/Makefile.am
@@ -1,3 +1,3 @@
-SUBDIRS = write-behind read-ahead io-threads io-cache symlink-cache quick-read md-cache open-behind
+SUBDIRS = write-behind read-ahead readdir-ahead io-threads io-cache symlink-cache quick-read md-cache open-behind
 
 CLEANFILES = 
diff --git a/xlators/performance/io-cache/src/io-cache.c b/xlators/performance/io-cache/src/io-cache.c
index a7459a9a3..201777b38 100644
--- a/xlators/performance/io-cache/src/io-cache.c
+++ b/xlators/performance/io-cache/src/io-cache.c
@@ -316,9 +316,11 @@ ioc_forget (xlator_t *this, inode_t *inode)
 static int32_t
 ioc_invalidate(xlator_t *this, inode_t *inode)
 {
+	uint64_t     ioc_addr = 0;
 	ioc_inode_t *ioc_inode = NULL;
 
-	inode_ctx_get(inode, this, (uint64_t *) &ioc_inode);
+	inode_ctx_get(inode, this, (uint64_t *) &ioc_addr);
+	ioc_inode = (void *) ioc_addr;
 
 	if (ioc_inode)
 		ioc_inode_flush(ioc_inode);
@@ -551,6 +553,13 @@ ioc_open_cbk (call_frame_t *frame, void *cookie, xlator_t *this, int32_t op_ret,
                 inode_ctx_get (fd->inode, this, &tmp_ioc_inode);
                 ioc_inode = (ioc_inode_t *)(long)tmp_ioc_inode;
 
+                //TODO: see why inode context is NULL and handle it.
+                if (!ioc_inode) {
+                        gf_log (this->name, GF_LOG_ERROR, "inode context is "
+                                "NULL (%s)", uuid_utoa (fd->inode->gfid));
+                        goto out;
+                }
+
                 ioc_table_lock (ioc_inode->table);
                 {
                         list_move_tail (&ioc_inode->inode_lru,
@@ -1415,6 +1424,58 @@ ioc_readdirp (call_frame_t *frame, xlator_t *this, fd_t *fd, size_t size,
         return 0;
 }
 
+static int32_t
+ioc_discard_cbk(call_frame_t *frame, void *cookie, xlator_t *this,
+		int32_t op_ret, int32_t op_errno, struct iatt *pre,
+		struct iatt *post, dict_t *xdata)
+{
+	STACK_UNWIND_STRICT(discard, frame, op_ret, op_errno, pre, post, xdata);
+	return 0;
+}
+
+static int32_t
+ioc_discard(call_frame_t *frame, xlator_t *this, fd_t *fd, off_t offset,
+	    size_t len, dict_t *xdata)
+{
+	uint64_t ioc_inode = 0;
+
+	inode_ctx_get (fd->inode, this, &ioc_inode);
+
+	if (ioc_inode)
+		ioc_inode_flush ((ioc_inode_t *)(long)ioc_inode);
+
+	STACK_WIND(frame, ioc_discard_cbk, FIRST_CHILD(this),
+		   FIRST_CHILD(this)->fops->discard, fd, offset, len, xdata);
+       return 0;
+}
+
+static int32_t
+ioc_zerofill_cbk(call_frame_t *frame, void *cookie, xlator_t *this,
+                int32_t op_ret, int32_t op_errno, struct iatt *pre,
+                struct iatt *post, dict_t *xdata)
+{
+        STACK_UNWIND_STRICT(zerofill, frame, op_ret,
+                            op_errno, pre, post, xdata);
+        return 0;
+}
+
+static int32_t
+ioc_zerofill(call_frame_t *frame, xlator_t *this, fd_t *fd, off_t offset,
+            size_t len, dict_t *xdata)
+{
+        uint64_t ioc_inode = 0;
+
+        inode_ctx_get (fd->inode, this, &ioc_inode);
+
+        if (ioc_inode)
+                ioc_inode_flush ((ioc_inode_t *)(long)ioc_inode);
+
+        STACK_WIND(frame, ioc_zerofill_cbk, FIRST_CHILD(this),
+                   FIRST_CHILD(this)->fops->zerofill, fd, offset, len, xdata);
+       return 0;
+}
+
+
 int32_t
 ioc_get_priority_list (const char *opt_str, struct list_head *first)
 {
@@ -1878,11 +1939,11 @@ int
 ioc_inode_dump (xlator_t *this, inode_t *inode)
 {
 
-        char          *path                           = NULL;
+        char         *path                            = NULL;
         int           ret                             = -1;
         char          key_prefix[GF_DUMP_MAX_BUF_LEN] = {0, };
         uint64_t      tmp_ioc_inode                   = 0;
-        ioc_inode_t   *ioc_inode                      = NULL;
+        ioc_inode_t  *ioc_inode                       = NULL;
         gf_boolean_t  section_added                   = _gf_false;
         char          uuid_str[64]                    = {0,};
 
@@ -1896,9 +1957,6 @@ ioc_inode_dump (xlator_t *this, inode_t *inode)
         if (ioc_inode == NULL)
                 goto out;
 
-        gf_proc_dump_add_section (key_prefix);
-        section_added = _gf_true;
-
         /* Similar to ioc_page_dump function its better to use
          * pthread_mutex_trylock and not to use gf_log in statedump
          * to avoid deadlocks.
@@ -1906,24 +1964,30 @@ ioc_inode_dump (xlator_t *this, inode_t *inode)
         ret = pthread_mutex_trylock (&ioc_inode->inode_lock);
         if (ret)
                 goto out;
-        else
+
         {
-                gf_proc_dump_write ("inode.weight", "%d", ioc_inode->weight);
+                if (uuid_is_null (ioc_inode->inode->gfid))
+                        goto unlock;
+
+                gf_proc_dump_add_section (key_prefix);
+                section_added = _gf_true;
 
-                //inode_path takes blocking lock on the itable.
                 __inode_path (ioc_inode->inode, NULL, &path);
 
+                gf_proc_dump_write ("inode.weight", "%d", ioc_inode->weight);
+
                 if (path) {
                         gf_proc_dump_write ("path", "%s", path);
                         GF_FREE (path);
                 }
+
                 gf_proc_dump_write ("uuid", "%s", uuid_utoa_r
                                     (ioc_inode->inode->gfid, uuid_str));
                 __ioc_cache_dump (ioc_inode, key_prefix);
                 __ioc_inode_waitq_dump (ioc_inode, key_prefix);
-
-                pthread_mutex_unlock (&ioc_inode->inode_lock);
         }
+unlock:
+        pthread_mutex_unlock (&ioc_inode->inode_lock);
 
 out:
         if (ret && ioc_inode) {
@@ -2037,6 +2101,8 @@ struct xlator_fops fops = {
         .mknod       = ioc_mknod,
 
         .readdirp    = ioc_readdirp,
+	.discard     = ioc_discard,
+        .zerofill    = ioc_zerofill,
 };
 
 
diff --git a/xlators/performance/io-cache/src/page.c b/xlators/performance/io-cache/src/page.c
index 54c6f9b50..b2e20ba65 100644
--- a/xlators/performance/io-cache/src/page.c
+++ b/xlators/performance/io-cache/src/page.c
@@ -824,7 +824,6 @@ ioc_frame_unwind (call_frame_t *frame)
         }
 
         //  ioc_local_lock (local);
-        frame->local = NULL;
         iobref = iobref_new ();
         if (iobref == NULL) {
                 op_ret = -1;
@@ -875,6 +874,7 @@ unwind:
 
         //  ioc_local_unlock (local);
 
+        frame->local = NULL;
         STACK_UNWIND_STRICT (readv, frame, op_ret, op_errno, vector,
                              count, &stbuf, iobref, NULL);
 
@@ -888,7 +888,8 @@ unwind:
         }
 
         pthread_mutex_destroy (&local->local_lock);
-        mem_put (local);
+        if (local)
+                mem_put (local);
 
         return;
 }
diff --git a/xlators/performance/io-threads/src/io-threads.c b/xlators/performance/io-threads/src/io-threads.c
index ccbd41194..bbcf4ed26 100644
--- a/xlators/performance/io-threads/src/io-threads.c
+++ b/xlators/performance/io-threads/src/io-threads.c
@@ -307,6 +307,9 @@ iot_schedule (call_frame_t *frame, xlator_t *this, call_stub_t *stub)
         case GF_FOP_XATTROP:
         case GF_FOP_FXATTROP:
         case GF_FOP_RCHECKSUM:
+	case GF_FOP_FALLOCATE:
+	case GF_FOP_DISCARD:
+        case GF_FOP_ZEROFILL:
                 pri = IOT_PRI_LO;
                 break;
 
@@ -321,9 +324,9 @@ iot_schedule (call_frame_t *frame, xlator_t *this, call_stub_t *stub)
                 break;
         }
 out:
-        ret = do_iot_schedule (this->private, stub, pri);
         gf_log (this->name, GF_LOG_DEBUG, "%s scheduled as %s fop",
                 gf_fop_list[stub->fop], iot_get_pri_meaning (pri));
+        ret = do_iot_schedule (this->private, stub, pri);
         return ret;
 }
 
@@ -2406,6 +2409,155 @@ out:
         return 0;
 }
 
+int
+iot_fallocate_cbk(call_frame_t *frame, void *cookie, xlator_t *this,
+                  int32_t op_ret, int32_t op_errno,
+                  struct iatt *preop, struct iatt *postop, dict_t *xdata)
+{
+        STACK_UNWIND_STRICT (fallocate, frame, op_ret, op_errno, preop, postop,
+                             xdata);
+        return 0;
+}
+
+
+int
+iot_fallocate_wrapper(call_frame_t *frame, xlator_t *this, fd_t *fd, int32_t mode,
+		      off_t offset, size_t len, dict_t *xdata)
+{
+        STACK_WIND (frame, iot_fallocate_cbk, FIRST_CHILD (this),
+                    FIRST_CHILD (this)->fops->fallocate, fd, mode, offset, len,
+		    xdata);
+        return 0;
+}
+
+
+int
+iot_fallocate(call_frame_t *frame, xlator_t *this, fd_t *fd, int32_t mode,
+	      off_t offset, size_t len, dict_t *xdata)
+{
+        call_stub_t     *stub = NULL;
+        int              ret = -1;
+
+        stub = fop_fallocate_stub(frame, iot_fallocate_wrapper, fd, mode, offset,
+				  len, xdata);
+        if (!stub) {
+                gf_log (this->name, GF_LOG_ERROR, "cannot create fallocate stub"
+                        "(out of memory)");
+                ret = -ENOMEM;
+                goto out;
+        }
+
+        ret = iot_schedule (frame, this, stub);
+
+out:
+        if (ret < 0) {
+                STACK_UNWIND_STRICT (fallocate, frame, -1, -ret, NULL, NULL,
+                                     NULL);
+                if (stub != NULL) {
+                        call_stub_destroy (stub);
+                }
+        }
+        return 0;
+}
+
+int
+iot_discard_cbk(call_frame_t *frame, void *cookie, xlator_t *this,
+                  int32_t op_ret, int32_t op_errno,
+                  struct iatt *preop, struct iatt *postop, dict_t *xdata)
+{
+        STACK_UNWIND_STRICT (discard, frame, op_ret, op_errno, preop, postop,
+                             xdata);
+        return 0;
+}
+
+
+int
+iot_discard_wrapper(call_frame_t *frame, xlator_t *this, fd_t *fd, off_t offset,
+		    size_t len, dict_t *xdata)
+{
+        STACK_WIND (frame, iot_discard_cbk, FIRST_CHILD (this),
+                    FIRST_CHILD (this)->fops->discard, fd, offset, len, xdata);
+        return 0;
+}
+
+
+int
+iot_discard(call_frame_t *frame, xlator_t *this, fd_t *fd, off_t offset,
+	    size_t len, dict_t *xdata)
+{
+        call_stub_t     *stub = NULL;
+        int              ret = -1;
+
+        stub = fop_discard_stub(frame, iot_discard_wrapper, fd, offset, len,
+				xdata);
+        if (!stub) {
+                gf_log (this->name, GF_LOG_ERROR, "cannot create discard stub"
+                        "(out of memory)");
+                ret = -ENOMEM;
+                goto out;
+        }
+
+        ret = iot_schedule (frame, this, stub);
+
+out:
+        if (ret < 0) {
+                STACK_UNWIND_STRICT (discard, frame, -1, -ret, NULL, NULL,
+                                     NULL);
+                if (stub != NULL) {
+                        call_stub_destroy (stub);
+                }
+        }
+        return 0;
+}
+
+int
+iot_zerofill_cbk(call_frame_t *frame, void *cookie, xlator_t *this,
+                  int32_t op_ret, int32_t op_errno,
+                  struct iatt *preop, struct iatt *postop, dict_t *xdata)
+{
+        STACK_UNWIND_STRICT (zerofill, frame, op_ret, op_errno, preop, postop,
+                             xdata);
+        return 0;
+}
+
+int
+iot_zerofill_wrapper(call_frame_t *frame, xlator_t *this, fd_t *fd,
+                     off_t offset, size_t len, dict_t *xdata)
+{
+        STACK_WIND (frame, iot_zerofill_cbk, FIRST_CHILD (this),
+                    FIRST_CHILD (this)->fops->zerofill, fd, offset, len, xdata);
+        return 0;
+}
+
+int
+iot_zerofill(call_frame_t *frame, xlator_t *this, fd_t *fd, off_t offset,
+            size_t len, dict_t *xdata)
+{
+        call_stub_t     *stub     = NULL;
+        int              ret      = -1;
+
+        stub = fop_zerofill_stub(frame, iot_zerofill_wrapper, fd,
+                                 offset, len, xdata);
+        if (!stub) {
+                gf_log (this->name, GF_LOG_ERROR, "cannot create zerofill stub"
+                        "(out of memory)");
+                ret = -ENOMEM;
+                goto out;
+        }
+
+        ret = iot_schedule (frame, this, stub);
+
+out:
+        if (ret < 0) {
+                STACK_UNWIND_STRICT (zerofill, frame, -1, -ret, NULL, NULL,
+                                     NULL);
+                if (stub != NULL) {
+                        call_stub_destroy (stub);
+                }
+        }
+        return 0;
+}
+
 
 int
 __iot_workers_scale (iot_conf_t *conf)
@@ -2432,7 +2584,7 @@ __iot_workers_scale (iot_conf_t *conf)
         while (diff) {
                 diff --;
 
-                ret = pthread_create (&thread, &conf->w_attr, iot_worker, conf);
+                ret = gf_thread_create (&thread, &conf->w_attr, iot_worker, conf);
                 if (ret == 0) {
                         conf->curr_count++;
                         gf_log (conf->this->name, GF_LOG_DEBUG,
@@ -2736,6 +2888,9 @@ struct xlator_fops fops = {
         .xattrop     = iot_xattrop,
 	.fxattrop    = iot_fxattrop,
         .rchecksum   = iot_rchecksum,
+	.fallocate   = iot_fallocate,
+	.discard     = iot_discard,
+        .zerofill    = iot_zerofill,
 };
 
 struct xlator_cbks cbks;
@@ -2799,6 +2954,7 @@ struct volume_options options[] = {
 	{.key	= {"least-rate-limit"},
 	 .type	= GF_OPTION_TYPE_INT,
 	 .min	= 0,
+         .max	= INT_MAX,
 	 .default_value = "0",
 	 .description = "Max number of least priority operations to handle "
 			"per-second"
diff --git a/xlators/performance/md-cache/src/md-cache.c b/xlators/performance/md-cache/src/md-cache.c
index 0c5ca87d2..84c363ad9 100644
--- a/xlators/performance/md-cache/src/md-cache.c
+++ b/xlators/performance/md-cache/src/md-cache.c
@@ -18,6 +18,7 @@
 #include "dict.h"
 #include "xlator.h"
 #include "md-cache-mem-types.h"
+#include "glusterfs-acl.h"
 #include <assert.h>
 #include <sys/time.h>
 
@@ -42,17 +43,17 @@ static struct mdc_key {
 	int         check;
 } mdc_keys[] = {
 	{
-		.name = "system.posix_acl_access",
+		.name = POSIX_ACL_ACCESS_XATTR,
 		.load = 0,
 		.check = 1,
 	},
 	{
-		.name = "system.posix_acl_default",
+		.name = POSIX_ACL_DEFAULT_XATTR,
 		.load = 0,
 		.check = 1,
 	},
 	{
-		.name = "security.selinux",
+		.name = GF_SELINUX_XATTR_KEY,
 		.load = 0,
 		.check = 1,
 	},
@@ -132,6 +133,7 @@ struct mdc_local {
         loc_t   loc2;
         fd_t   *fd;
         char   *linkname;
+	char   *key;
         dict_t *xattr;
 };
 
@@ -174,7 +176,7 @@ __mdc_inode_ctx_set (xlator_t *this, inode_t *inode, struct md_cache *mdc)
         uint64_t         mdc_int = 0;
 
 	mdc_int = (long) mdc;
-	ret = __inode_ctx_set2 (inode, this, &mdc_int, 0);
+	ret = __inode_ctx_set (inode, this, &mdc_int);
 
 	return ret;
 }
@@ -229,6 +231,8 @@ mdc_local_wipe (xlator_t *this, mdc_local_t *local)
 
         GF_FREE (local->linkname);
 
+        GF_FREE (local->key);
+
         if (local->xattr)
                 dict_unref (local->xattr);
 
@@ -585,6 +589,31 @@ out:
 
 
 int
+mdc_inode_xatt_unset (xlator_t *this, inode_t *inode, char *name)
+{
+        int              ret = -1;
+        struct md_cache *mdc = NULL;
+
+        mdc = mdc_inode_prep (this, inode);
+        if (!mdc)
+                goto out;
+
+        if (!name)
+                goto out;
+
+        LOCK (&mdc->lock);
+        {
+		dict_del (mdc->xattr, name);
+        }
+        UNLOCK (&mdc->lock);
+
+        ret = 0;
+out:
+        return ret;
+}
+
+
+int
 mdc_inode_xatt_get (xlator_t *this, inode_t *inode, dict_t **dict)
 {
         int              ret = -1;
@@ -598,13 +627,15 @@ mdc_inode_xatt_get (xlator_t *this, inode_t *inode, dict_t **dict)
 
         LOCK (&mdc->lock);
         {
+                ret = 0;
+		/* Missing xattr only means no keys were there, i.e
+		   a negative cache for the "loaded" keys
+		*/
                 if (!mdc->xattr)
                         goto unlock;
 
                 if (dict)
                         *dict = dict_ref (mdc->xattr);
-
-                ret = 0;
         }
 unlock:
         UNLOCK (&mdc->lock);
@@ -614,6 +645,46 @@ out:
 }
 
 
+int
+mdc_inode_iatt_invalidate (xlator_t *this, inode_t *inode)
+{
+        int              ret = -1;
+        struct md_cache *mdc = NULL;
+
+        if (mdc_inode_ctx_get (this, inode, &mdc) != 0)
+                goto out;
+
+        LOCK (&mdc->lock);
+        {
+		mdc->ia_time = 0;
+        }
+        UNLOCK (&mdc->lock);
+
+out:
+        return ret;
+}
+
+
+int
+mdc_inode_xatt_invalidate (xlator_t *this, inode_t *inode)
+{
+        int              ret = -1;
+        struct md_cache *mdc = NULL;
+
+        if (mdc_inode_ctx_get (this, inode, &mdc) != 0)
+                goto out;
+
+        LOCK (&mdc->lock);
+        {
+		mdc->xa_time = 0;
+        }
+        UNLOCK (&mdc->lock);
+
+out:
+        return ret;
+}
+
+
 void
 mdc_load_reqs (xlator_t *this, dict_t *dict)
 {
@@ -647,7 +718,7 @@ is_mdc_key_satisfied (const char *key)
 		return 0;
 
 	for (mdc_key = mdc_keys[i].name; (mdc_key = mdc_keys[i].name); i++) {
-		if (!mdc_keys[i].check)
+		if (!mdc_keys[i].load)
 			continue;
 		if (strcmp (mdc_key, key) == 0)
 			return 1;
@@ -721,6 +792,7 @@ mdc_lookup (call_frame_t *frame, xlator_t *this, loc_t *loc,
         struct iatt  stbuf = {0, };
         struct iatt  postparent = {0, };
         dict_t      *xattr_rsp = NULL;
+        dict_t      *xattr_alloc = NULL;
         mdc_local_t *local = NULL;
 
 
@@ -728,6 +800,13 @@ mdc_lookup (call_frame_t *frame, xlator_t *this, loc_t *loc,
         if (!local)
                 goto uncached;
 
+	if (!loc->name)
+		/* A nameless discovery is dangerous to cache. We
+		   perform nameless lookup with the intention of
+		   re-establishing an inode "properly"
+		*/
+		goto uncached;
+
         loc_copy (&local->loc, loc);
 
         ret = mdc_inode_iatt_get (this, loc->inode, &stbuf);
@@ -752,6 +831,8 @@ mdc_lookup (call_frame_t *frame, xlator_t *this, loc_t *loc,
         return 0;
 
 uncached:
+	if (!xdata)
+		xdata = xattr_alloc = dict_new ();
 	if (xdata)
 		mdc_load_reqs (this, xdata);
 
@@ -760,7 +841,8 @@ uncached:
 
         if (xattr_rsp)
                 dict_unref (xattr_rsp);
-
+	if (xattr_alloc)
+		dict_unref (xattr_alloc);
         return 0;
 }
 
@@ -1573,6 +1655,8 @@ mdc_setxattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
 
         mdc_inode_xatt_update (this, local->loc.inode, local->xattr);
 
+	mdc_inode_iatt_invalidate (this, local->loc.inode);
+
 out:
         MDC_STACK_UNWIND (setxattr, frame, op_ret, op_errno, xdata);
 
@@ -1614,6 +1698,7 @@ mdc_fsetxattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
 
         mdc_inode_xatt_update (this, local->fd->inode, local->xattr);
 
+	mdc_inode_iatt_invalidate (this, local->fd->inode);
 out:
         MDC_STACK_UNWIND (fsetxattr, frame, op_ret, op_errno, xdata);
 
@@ -1666,6 +1751,7 @@ mdc_getxattr (call_frame_t *frame, xlator_t *this, loc_t *loc, const char *key,
               dict_t *xdata)
 {
         int           ret;
+	int           op_errno = ENODATA;
         mdc_local_t  *local = NULL;
 	dict_t       *xattr = NULL;
 
@@ -1682,10 +1768,12 @@ mdc_getxattr (call_frame_t *frame, xlator_t *this, loc_t *loc, const char *key,
 	if (ret != 0)
 		goto uncached;
 
-	if (!dict_get (xattr, (char *)key))
-		goto uncached;
+	if (!xattr || !dict_get (xattr, (char *)key)) {
+		ret = -1;
+		op_errno = ENODATA;
+	}
 
-        MDC_STACK_UNWIND (getxattr, frame, 0, 0, xattr, xdata);
+        MDC_STACK_UNWIND (getxattr, frame, ret, op_errno, xattr, xdata);
 
         return 0;
 
@@ -1727,6 +1815,7 @@ mdc_fgetxattr (call_frame_t *frame, xlator_t *this, fd_t *fd, const char *key,
         int           ret;
         mdc_local_t  *local = NULL;
 	dict_t       *xattr = NULL;
+	int           op_errno = ENODATA;
 
         local = mdc_local_get (frame);
         if (!local)
@@ -1741,10 +1830,12 @@ mdc_fgetxattr (call_frame_t *frame, xlator_t *this, fd_t *fd, const char *key,
 	if (ret != 0)
 		goto uncached;
 
-	if (!dict_get (xattr, (char *)key))
-		goto uncached;
+	if (!xattr || !dict_get (xattr, (char *)key)) {
+		ret = -1;
+		op_errno = ENODATA;
+	}
 
-        MDC_STACK_UNWIND (fgetxattr, frame, 0, 0, xattr, xdata);
+        MDC_STACK_UNWIND (fgetxattr, frame, ret, op_errno, xattr, xdata);
 
         return 0;
 
@@ -1755,6 +1846,97 @@ uncached:
         return 0;
 }
 
+int
+mdc_removexattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+		     int32_t op_ret, int32_t op_errno, dict_t *xdata)
+{
+        mdc_local_t  *local = NULL;
+
+        local = frame->local;
+
+        if (op_ret != 0)
+                goto out;
+
+        if (!local)
+                goto out;
+
+	if (local->key)
+		mdc_inode_xatt_unset (this, local->loc.inode, local->key);
+	else
+		mdc_inode_xatt_invalidate (this, local->loc.inode);
+
+	mdc_inode_iatt_invalidate (this, local->loc.inode);
+out:
+        MDC_STACK_UNWIND (removexattr, frame, op_ret, op_errno, xdata);
+
+        return 0;
+}
+
+
+int
+mdc_removexattr (call_frame_t *frame, xlator_t *this, loc_t *loc,
+		 const char *name, dict_t *xdata)
+{
+        mdc_local_t  *local = NULL;
+
+        local = mdc_local_get (frame);
+
+	loc_copy (&local->loc, loc);
+
+	local->key = gf_strdup (name);
+
+        STACK_WIND (frame, mdc_removexattr_cbk,
+                    FIRST_CHILD(this), FIRST_CHILD(this)->fops->removexattr,
+                    loc, name, xdata);
+        return 0;
+}
+
+
+int
+mdc_fremovexattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+		      int32_t op_ret, int32_t op_errno, dict_t *xdata)
+{
+        mdc_local_t  *local = NULL;
+
+        local = frame->local;
+
+        if (op_ret != 0)
+                goto out;
+
+        if (!local)
+                goto out;
+
+	if (local->key)
+		mdc_inode_xatt_unset (this, local->fd->inode, local->key);
+	else
+		mdc_inode_xatt_invalidate (this, local->fd->inode);
+
+	mdc_inode_iatt_invalidate (this, local->fd->inode);
+out:
+        MDC_STACK_UNWIND (fremovexattr, frame, op_ret, op_errno, xdata);
+
+        return 0;
+}
+
+
+int
+mdc_fremovexattr (call_frame_t *frame, xlator_t *this, fd_t *fd,
+		  const char *name, dict_t *xdata)
+{
+        mdc_local_t  *local = NULL;
+
+        local = mdc_local_get (frame);
+
+	local->fd = fd_ref (fd);
+
+	local->key = gf_strdup (name);
+
+        STACK_WIND (frame, mdc_fremovexattr_cbk,
+                    FIRST_CHILD(this), FIRST_CHILD(this)->fops->fremovexattr,
+                    fd, name, xdata);
+        return 0;
+}
+
 
 int
 mdc_readdirp_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
@@ -1782,9 +1964,18 @@ int
 mdc_readdirp (call_frame_t *frame, xlator_t *this, fd_t *fd,
 	      size_t size, off_t offset, dict_t *xdata)
 {
+	dict_t *xattr_alloc = NULL;
+
+	if (!xdata)
+		xdata = xattr_alloc = dict_new ();
+	if (xdata)
+		mdc_load_reqs (this, xdata);
+
 	STACK_WIND (frame, mdc_readdirp_cbk,
 		    FIRST_CHILD (this), FIRST_CHILD (this)->fops->readdirp,
 		    fd, size, offset, xdata);
+	if (xattr_alloc)
+		dict_unref (xattr_alloc);
 	return 0;
 }
 
@@ -1828,6 +2019,123 @@ mdc_readdir (call_frame_t *frame, xlator_t *this, fd_t *fd,
 	return 0;
 }
 
+int
+mdc_fallocate_cbk(call_frame_t *frame, void *cookie, xlator_t *this,
+                  int32_t op_ret, int32_t op_errno,
+                  struct iatt *prebuf, struct iatt *postbuf, dict_t *xdata)
+{
+        mdc_local_t  *local = NULL;
+
+        local = frame->local;
+
+        if (op_ret != 0)
+                goto out;
+
+        if (!local)
+                goto out;
+
+        mdc_inode_iatt_set_validate(this, local->fd->inode, prebuf, postbuf);
+
+out:
+        MDC_STACK_UNWIND (fallocate, frame, op_ret, op_errno, prebuf, postbuf,
+                          xdata);
+
+        return 0;
+}
+
+int mdc_fallocate(call_frame_t *frame, xlator_t *this, fd_t *fd, int32_t mode,
+		  off_t offset, size_t len, dict_t *xdata)
+{
+	mdc_local_t *local;
+
+	local = mdc_local_get(frame);
+	local->fd = fd_ref(fd);
+
+	STACK_WIND(frame, mdc_fallocate_cbk, FIRST_CHILD(this),
+		   FIRST_CHILD(this)->fops->fallocate, fd, mode, offset, len,
+		   xdata);
+
+	return 0;
+}
+
+int
+mdc_discard_cbk(call_frame_t *frame, void *cookie, xlator_t *this,
+                int32_t op_ret, int32_t op_errno,
+                struct iatt *prebuf, struct iatt *postbuf, dict_t *xdata)
+{
+        mdc_local_t  *local = NULL;
+
+        local = frame->local;
+
+        if (op_ret != 0)
+                goto out;
+
+        if (!local)
+                goto out;
+
+        mdc_inode_iatt_set_validate(this, local->fd->inode, prebuf, postbuf);
+
+out:
+        MDC_STACK_UNWIND(discard, frame, op_ret, op_errno, prebuf, postbuf,
+                         xdata);
+
+        return 0;
+}
+
+int mdc_discard(call_frame_t *frame, xlator_t *this, fd_t *fd, off_t offset,
+		size_t len, dict_t *xdata)
+{
+	mdc_local_t *local;
+
+	local = mdc_local_get(frame);
+	local->fd = fd_ref(fd);
+
+	STACK_WIND(frame, mdc_discard_cbk, FIRST_CHILD(this),
+		   FIRST_CHILD(this)->fops->discard, fd, offset, len,
+		   xdata);
+
+	return 0;
+}
+
+int
+mdc_zerofill_cbk(call_frame_t *frame, void *cookie, xlator_t *this,
+                int32_t op_ret, int32_t op_errno,
+                struct iatt *prebuf, struct iatt *postbuf, dict_t *xdata)
+{
+        mdc_local_t  *local = NULL;
+
+        local = frame->local;
+
+        if (op_ret != 0)
+                goto out;
+
+        if (!local)
+                goto out;
+
+        mdc_inode_iatt_set_validate(this, local->fd->inode, prebuf, postbuf);
+
+out:
+        MDC_STACK_UNWIND(zerofill, frame, op_ret, op_errno, prebuf, postbuf,
+                         xdata);
+
+        return 0;
+}
+
+int mdc_zerofill(call_frame_t *frame, xlator_t *this, fd_t *fd, off_t offset,
+                size_t len, dict_t *xdata)
+{
+        mdc_local_t *local;
+
+        local = mdc_local_get(frame);
+        local->fd = fd_ref(fd);
+
+        STACK_WIND(frame, mdc_zerofill_cbk, FIRST_CHILD(this),
+                   FIRST_CHILD(this)->fops->zerofill, fd, offset, len,
+                   xdata);
+
+        return 0;
+}
+
 
 int
 mdc_forget (xlator_t *this, inode_t *inode)
@@ -1955,8 +2263,13 @@ struct xlator_fops fops = {
         .fsetxattr   = mdc_fsetxattr,
         .getxattr    = mdc_getxattr,
         .fgetxattr   = mdc_fgetxattr,
+	.removexattr = mdc_removexattr,
+	.fremovexattr= mdc_fremovexattr,
 	.readdirp    = mdc_readdirp,
-	.readdir     = mdc_readdir
+	.readdir     = mdc_readdir,
+	.fallocate   = mdc_fallocate,
+	.discard     = mdc_discard,
+        .zerofill    = mdc_zerofill,
 };
 
 
@@ -1986,4 +2299,5 @@ struct volume_options options[] = {
 	  .description = "Convert all readdir requests to readdirplus to "
 			 "collect stat info on each entry.",
 	},
+    { .key = {NULL} },
 };
diff --git a/xlators/performance/open-behind/src/open-behind.c b/xlators/performance/open-behind/src/open-behind.c
index e23a23325..7e5b57278 100644
--- a/xlators/performance/open-behind/src/open-behind.c
+++ b/xlators/performance/open-behind/src/open-behind.c
@@ -681,6 +681,63 @@ err:
 	return 0;
 }
 
+int
+ob_fallocate(call_frame_t *frame, xlator_t *this, fd_t *fd, int32_t mode,
+	     off_t offset, size_t len, dict_t *xdata)
+{
+	call_stub_t *stub;
+
+	stub = fop_fallocate_stub(frame, default_fallocate_resume, fd, mode,
+				  offset, len, xdata);
+	if (!stub)
+		goto err;
+
+	open_and_resume(this, fd, stub);
+
+	return 0;
+err:
+	STACK_UNWIND_STRICT(fallocate, frame, -1, ENOMEM, NULL, NULL, NULL);
+	return 0;
+}
+
+int
+ob_discard(call_frame_t *frame, xlator_t *this, fd_t *fd, off_t offset,
+	   size_t len, dict_t *xdata)
+{
+	call_stub_t *stub;
+
+	stub = fop_discard_stub(frame, default_discard_resume, fd, offset, len,
+				xdata);
+	if (!stub)
+		goto err;
+
+	open_and_resume(this, fd, stub);
+
+	return 0;
+err:
+	STACK_UNWIND_STRICT(discard, frame, -1, ENOMEM, NULL, NULL, NULL);
+	return 0;
+}
+
+int
+ob_zerofill(call_frame_t *frame, xlator_t *this, fd_t *fd, off_t offset,
+           size_t len, dict_t *xdata)
+{
+        call_stub_t *stub;
+
+        stub = fop_zerofill_stub(frame, default_zerofill_resume, fd,
+                                 offset, len, xdata);
+        if (!stub)
+                goto err;
+
+        open_and_resume(this, fd, stub);
+
+        return 0;
+err:
+        STACK_UNWIND_STRICT(zerofill, frame, -1, ENOMEM, NULL, NULL, NULL);
+        return 0;
+}
+
 
 int
 ob_unlink (call_frame_t *frame, xlator_t *this, loc_t *loc, int xflags,
@@ -697,6 +754,8 @@ ob_unlink (call_frame_t *frame, xlator_t *this, loc_t *loc, int xflags,
 	fd = fd_lookup (loc->inode, 0);
 
 	open_and_resume (this, fd, stub);
+        if (fd)
+                fd_unref (fd);
 
 	return 0;
 err:
@@ -721,6 +780,8 @@ ob_rename (call_frame_t *frame, xlator_t *this, loc_t *src, loc_t *dst,
 		fd = fd_lookup (dst->inode, 0);
 
 	open_and_resume (this, fd, stub);
+        if (fd)
+                fd_unref (fd);
 
 	return 0;
 err:
@@ -903,6 +964,9 @@ struct xlator_fops fops = {
 	.fentrylk    = ob_fentrylk,
 	.fxattrop    = ob_fxattrop,
 	.fsetattr    = ob_fsetattr,
+	.fallocate   = ob_fallocate,
+	.discard     = ob_discard,
+        .zerofill    = ob_zerofill,
 	.unlink      = ob_unlink,
 	.rename      = ob_rename,
 	.lk          = ob_lk,
@@ -922,15 +986,16 @@ struct volume_options options[] = {
         { .key  = {"use-anonymous-fd"},
           .type = GF_OPTION_TYPE_BOOL,
           .default_value = "yes",
-	  .description = "For read operations, use anonymous FD when "
-	  "original FD is open-behind and not yet opened in the backend.",
+          .description = "For read operations, use anonymous FD when "
+          "original FD is open-behind and not yet opened in the backend.",
         },
         { .key  = {"lazy-open"},
           .type = GF_OPTION_TYPE_BOOL,
           .default_value = "yes",
-	  .description = "Perform open in the backend only when a necessary "
-	  "FOP arrives (e.g writev on the FD, unlink of the file). When option "
-	  "is disabled, perform backend open right after unwinding open().",
+          .description = "Perform open in the backend only when a necessary "
+          "FOP arrives (e.g writev on the FD, unlink of the file). When option "
+          "is disabled, perform backend open right after unwinding open().",
         },
+        { .key  = {NULL} }
 
 };
diff --git a/xlators/performance/quick-read/src/quick-read.c b/xlators/performance/quick-read/src/quick-read.c
index 1a0f8675e..445ea8658 100644
--- a/xlators/performance/quick-read/src/quick-read.c
+++ b/xlators/performance/quick-read/src/quick-read.c
@@ -622,6 +622,46 @@ wind:
 
 
 int
+qr_writev (call_frame_t *frame, xlator_t *this, fd_t *fd, struct iovec *iov,
+	   int count, off_t offset, uint32_t flags, struct iobref *iobref,
+	   dict_t *xdata)
+{
+	qr_inode_prune (this, fd->inode);
+
+	STACK_WIND (frame, default_writev_cbk,
+		    FIRST_CHILD (this), FIRST_CHILD (this)->fops->writev,
+		    fd, iov, count, offset, flags, iobref, xdata);
+	return 0;
+}
+
+
+int
+qr_truncate (call_frame_t *frame, xlator_t *this, loc_t *loc, off_t offset,
+	     dict_t *xdata)
+{
+	qr_inode_prune (this, loc->inode);
+
+	STACK_WIND (frame, default_truncate_cbk,
+		    FIRST_CHILD (this), FIRST_CHILD (this)->fops->truncate,
+		    loc, offset, xdata);
+	return 0;
+}
+
+
+int
+qr_ftruncate (call_frame_t *frame, xlator_t *this, fd_t *fd, off_t offset,
+	      dict_t *xdata)
+{
+	qr_inode_prune (this, fd->inode);
+
+	STACK_WIND (frame, default_ftruncate_cbk,
+		    FIRST_CHILD (this), FIRST_CHILD (this)->fops->ftruncate,
+		    fd, offset, xdata);
+	return 0;
+}
+
+
+int
 qr_open (call_frame_t *frame, xlator_t *this, loc_t *loc, int flags,
 	 fd_t *fd, dict_t *xdata)
 {
@@ -1066,6 +1106,9 @@ struct xlator_fops fops = {
 	.readdirp    = qr_readdirp,
         .open        = qr_open,
         .readv       = qr_readv,
+	.writev      = qr_writev,
+	.truncate    = qr_truncate,
+	.ftruncate   = qr_ftruncate
 };
 
 struct xlator_cbks cbks = {
@@ -1100,4 +1143,5 @@ struct volume_options options[] = {
           .max  = 1 * GF_UNIT_KB * 1000,
           .default_value = "64KB",
         },
+        { .key  = {NULL} }
 };
diff --git a/xlators/performance/read-ahead/src/read-ahead.c b/xlators/performance/read-ahead/src/read-ahead.c
index 522fa52b8..069ab1f1a 100644
--- a/xlators/performance/read-ahead/src/read-ahead.c
+++ b/xlators/performance/read-ahead/src/read-ahead.c
@@ -942,6 +942,106 @@ unwind:
         return 0;
 }
 
+int
+ra_discard_cbk(call_frame_t *frame, void *cookie, xlator_t *this,
+               int32_t op_ret, int32_t op_errno, struct iatt *prebuf,
+               struct iatt *postbuf, dict_t *xdata)
+{
+        GF_ASSERT (frame);
+
+        STACK_UNWIND_STRICT (discard, frame, op_ret, op_errno, prebuf,
+                             postbuf, xdata);
+        return 0;
+}
+
+static int
+ra_discard(call_frame_t *frame, xlator_t *this, fd_t *fd, off_t offset,
+	     size_t len, dict_t *xdata)
+{
+        ra_file_t *file    = NULL;
+        fd_t      *iter_fd = NULL;
+        inode_t   *inode   = NULL;
+        uint64_t  tmp_file = 0;
+        int32_t   op_errno = EINVAL;
+
+        GF_ASSERT (frame);
+        GF_VALIDATE_OR_GOTO (frame->this->name, this, unwind);
+        GF_VALIDATE_OR_GOTO (frame->this->name, fd, unwind);
+
+        inode = fd->inode;
+
+        LOCK (&inode->lock);
+        {
+                list_for_each_entry (iter_fd, &inode->fd_list, inode_list) {
+                        fd_ctx_get (iter_fd, this, &tmp_file);
+                        file = (ra_file_t *)(long)tmp_file;
+                        if (!file)
+                                continue;
+
+                        flush_region(frame, file, offset, len, 1);
+                }
+        }
+        UNLOCK (&inode->lock);
+
+        STACK_WIND (frame, ra_discard_cbk, FIRST_CHILD (this),
+                    FIRST_CHILD (this)->fops->discard, fd, offset, len, xdata);
+        return 0;
+
+unwind:
+        STACK_UNWIND_STRICT (discard, frame, -1, op_errno, NULL, NULL, NULL);
+        return 0;
+}
+
+int
+ra_zerofill_cbk(call_frame_t *frame, void *cookie, xlator_t *this,
+               int32_t op_ret, int32_t op_errno, struct iatt *prebuf,
+               struct iatt *postbuf, dict_t *xdata)
+{
+        GF_ASSERT (frame);
+
+        STACK_UNWIND_STRICT (zerofill, frame, op_ret, op_errno, prebuf,
+                             postbuf, xdata);
+        return 0;
+}
+
+static int
+ra_zerofill(call_frame_t *frame, xlator_t *this, fd_t *fd, off_t offset,
+             size_t len, dict_t *xdata)
+{
+        ra_file_t *file    = NULL;
+        fd_t      *iter_fd = NULL;
+        inode_t   *inode   = NULL;
+        uint64_t  tmp_file = 0;
+        int32_t   op_errno = EINVAL;
+
+        GF_ASSERT (frame);
+        GF_VALIDATE_OR_GOTO (frame->this->name, this, unwind);
+        GF_VALIDATE_OR_GOTO (frame->this->name, fd, unwind);
+
+        inode = fd->inode;
+
+        LOCK (&inode->lock);
+        {
+                list_for_each_entry (iter_fd, &inode->fd_list, inode_list) {
+                        fd_ctx_get (iter_fd, this, &tmp_file);
+                        file = (ra_file_t *)(long)tmp_file;
+                        if (!file)
+                                continue;
+
+                        flush_region(frame, file, offset, len, 1);
+                }
+        }
+        UNLOCK (&inode->lock);
+
+        STACK_WIND (frame, ra_zerofill_cbk, FIRST_CHILD (this),
+                    FIRST_CHILD (this)->fops->zerofill, fd,
+                    offset, len, xdata);
+        return 0;
+
+unwind:
+        STACK_UNWIND_STRICT (zerofill, frame, -1, op_errno, NULL, NULL, NULL);
+        return 0;
+}
 
 int
 ra_priv_dump (xlator_t *this)
@@ -1123,6 +1223,8 @@ struct xlator_fops fops = {
         .truncate    = ra_truncate,
         .ftruncate   = ra_ftruncate,
         .fstat       = ra_fstat,
+	.discard     = ra_discard,
+        .zerofill    = ra_zerofill,
 };
 
 struct xlator_cbks cbks = {
diff --git a/xlators/performance/readdir-ahead/Makefile.am b/xlators/performance/readdir-ahead/Makefile.am
new file mode 100644
index 000000000..a985f42a8
--- /dev/null
+++ b/xlators/performance/readdir-ahead/Makefile.am
@@ -0,0 +1,3 @@
+SUBDIRS = src
+
+CLEANFILES =
diff --git a/xlators/performance/readdir-ahead/src/Makefile.am b/xlators/performance/readdir-ahead/src/Makefile.am
new file mode 100644
index 000000000..cdabd1428
--- /dev/null
+++ b/xlators/performance/readdir-ahead/src/Makefile.am
@@ -0,0 +1,15 @@
+xlator_LTLIBRARIES = readdir-ahead.la
+xlatordir = $(libdir)/glusterfs/$(PACKAGE_VERSION)/xlator/performance
+
+readdir_ahead_la_LDFLAGS = -module -avoidversion
+
+readdir_ahead_la_SOURCES = readdir-ahead.c
+readdir_ahead_la_LIBADD = $(top_builddir)/libglusterfs/src/libglusterfs.la
+
+noinst_HEADERS = readdir-ahead.h readdir-ahead-mem-types.h
+
+AM_CPPFLAGS = $(GF_CPPFLAGS) -I$(top_srcdir)/libglusterfs/src
+
+AM_CFLAGS = -Wall $(GF_CFLAGS)
+
+CLEANFILES =
diff --git a/xlators/performance/readdir-ahead/src/readdir-ahead-mem-types.h b/xlators/performance/readdir-ahead/src/readdir-ahead-mem-types.h
new file mode 100644
index 000000000..39e2c5369
--- /dev/null
+++ b/xlators/performance/readdir-ahead/src/readdir-ahead-mem-types.h
@@ -0,0 +1,24 @@
+/*
+  Copyright (c) 2008-2013 Red Hat, Inc. <http://www.redhat.com>
+  This file is part of GlusterFS.
+
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
+*/
+
+
+#ifndef __RDA_MEM_TYPES_H__
+#define __RDA_MEM_TYPES_H__
+
+#include "mem-types.h"
+
+enum gf_rda_mem_types_ {
+        gf_rda_mt_rda_local   = gf_common_mt_end + 1,
+	gf_rda_mt_rda_fd_ctx,
+	gf_rda_mt_rda_priv,
+        gf_rda_mt_end
+};
+
+#endif
diff --git a/xlators/performance/readdir-ahead/src/readdir-ahead.c b/xlators/performance/readdir-ahead/src/readdir-ahead.c
new file mode 100644
index 000000000..53e6756f0
--- /dev/null
+++ b/xlators/performance/readdir-ahead/src/readdir-ahead.c
@@ -0,0 +1,560 @@
+/*
+  Copyright (c) 2008-2013 Red Hat, Inc. <http://www.redhat.com>
+  This file is part of GlusterFS.
+
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
+*/
+
+/*
+ * performance/readdir-ahead preloads a local buffer with directory entries
+ * on opendir. The optimization involves using maximum sized gluster rpc
+ * requests (128k) to minimize overhead of smaller client requests.
+ *
+ * For example, fuse currently supports a maximum readdir buffer of 4k
+ * (regardless of the filesystem client's buffer size). readdir-ahead should
+ * effectively convert these smaller requests into fewer, larger sized requests
+ * for simple, sequential workloads (i.e., ls).
+ *
+ * The translator is currently designed to handle the simple, sequential case
+ * only. If a non-sequential directory read occurs, readdir-ahead disables
+ * preloads on the directory.
+ */
+
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+
+#include "glusterfs.h"
+#include "xlator.h"
+#include "call-stub.h"
+#include "readdir-ahead.h"
+#include "readdir-ahead-mem-types.h"
+#include "defaults.h"
+
+static int rda_fill_fd(call_frame_t *, xlator_t *, fd_t *);
+
+/*
+ * Get (or create) the fd context for storing prepopulated directory
+ * entries.
+ */
+static struct
+rda_fd_ctx *get_rda_fd_ctx(fd_t *fd, xlator_t *this)
+{
+	uint64_t val;
+	struct rda_fd_ctx *ctx;
+
+	LOCK(&fd->lock);
+
+	if (__fd_ctx_get(fd, this, &val) < 0) {
+		ctx = GF_CALLOC(1, sizeof(struct rda_fd_ctx),
+				gf_rda_mt_rda_fd_ctx);
+		if (!ctx)
+			goto out;
+
+		LOCK_INIT(&ctx->lock);
+		INIT_LIST_HEAD(&ctx->entries.list);
+		ctx->state = RDA_FD_NEW;
+		/* ctx offset values initialized to 0 */
+
+		if (__fd_ctx_set(fd, this, (uint64_t) ctx) < 0) {
+			GF_FREE(ctx);
+			ctx = NULL;
+			goto out;
+		}
+	} else {
+		ctx = (struct rda_fd_ctx *) val;
+	}
+out:
+	UNLOCK(&fd->lock);
+	return ctx;
+}
+
+/*
+ * Reset the tracking state of the context.
+ */
+static void
+rda_reset_ctx(struct rda_fd_ctx *ctx)
+{
+	ctx->state = RDA_FD_NEW;
+	ctx->cur_offset = 0;
+	ctx->cur_size = 0;
+	ctx->next_offset = 0;
+	gf_dirent_free(&ctx->entries);
+}
+
+/*
+ * Check whether we can handle a request. Offset verification is done by the
+ * caller, so we only check whether the preload buffer has completion status
+ * (including an error) or has some data to return.
+ */
+static gf_boolean_t
+rda_can_serve_readdirp(struct rda_fd_ctx *ctx, size_t request_size)
+{
+	if ((ctx->state & RDA_FD_EOD) ||
+	    (ctx->state & RDA_FD_ERROR) ||
+	    (!(ctx->state & RDA_FD_PLUGGED) && (ctx->cur_size > 0)))
+		return _gf_true;
+
+	return _gf_false;
+}
+
+/*
+ * Serve a request from the fd dentry list based on the size of the request
+ * buffer. ctx must be locked.
+ */
+static int32_t
+__rda_serve_readdirp(xlator_t *this, gf_dirent_t *entries, size_t request_size,
+		   struct rda_fd_ctx *ctx)
+{
+	gf_dirent_t *dirent, *tmp;
+	size_t dirent_size, size = 0;
+	int32_t count = 0;
+	struct rda_priv *priv = this->private;
+
+	list_for_each_entry_safe(dirent, tmp, &ctx->entries.list, list) {
+		dirent_size = gf_dirent_size(dirent->d_name);
+		if (size + dirent_size > request_size)
+			break;
+
+		size += dirent_size;
+		list_del_init(&dirent->list);
+		ctx->cur_size -= dirent_size;
+
+		list_add_tail(&dirent->list, &entries->list);
+		ctx->cur_offset = dirent->d_off;
+		count++;
+	}
+
+	if (ctx->cur_size <= priv->rda_low_wmark)
+		ctx->state |= RDA_FD_PLUGGED;
+
+	return count;
+}
+
+static int32_t
+rda_readdirp_stub(call_frame_t *frame, xlator_t *this, fd_t *fd, size_t size,
+		  off_t offset, dict_t *xdata)
+{
+	gf_dirent_t entries;
+	int32_t ret;
+	struct rda_fd_ctx *ctx;
+	int op_errno = 0;
+
+	ctx = get_rda_fd_ctx(fd, this);
+	INIT_LIST_HEAD(&entries.list);
+	ret = __rda_serve_readdirp(this, &entries, size, ctx);
+
+	if (!ret && (ctx->state & RDA_FD_ERROR)) {
+		ret = -1;
+		op_errno = ctx->op_errno;
+		ctx->state &= ~RDA_FD_ERROR;
+
+		/*
+		 * the preload has stopped running in the event of an error, so
+		 * pass all future requests along
+		 */
+		ctx->state |= RDA_FD_BYPASS;
+	}
+
+	STACK_UNWIND_STRICT(readdirp, frame, ret, op_errno, &entries, xdata);
+	gf_dirent_free(&entries);
+
+	return 0;
+}
+
+static int32_t
+rda_readdirp(call_frame_t *frame, xlator_t *this, fd_t *fd, size_t size,
+	     off_t off, dict_t *xdata)
+{
+	struct rda_fd_ctx *ctx;
+	call_stub_t *stub;
+	int fill = 0;
+
+	ctx = get_rda_fd_ctx(fd, this);
+	if (!ctx)
+		goto err;
+
+	if (ctx->state & RDA_FD_BYPASS)
+		goto bypass;
+
+	LOCK(&ctx->lock);
+
+	/* recheck now that we have the lock */
+	if (ctx->state & RDA_FD_BYPASS) {
+		UNLOCK(&ctx->lock);
+		goto bypass;
+	}
+
+	/*
+	 * If a new read comes in at offset 0 and the buffer has been
+	 * completed, reset the context and kickstart the filler again.
+	 */
+	if (!off && (ctx->state & RDA_FD_EOD) && (ctx->cur_size == 0)) {
+		rda_reset_ctx(ctx);
+		fill = 1;
+	}
+
+	/*
+	 * If a readdir occurs at an unexpected offset or we already have a
+	 * request pending, admit defeat and just get out of the way.
+	 */
+	if (off != ctx->cur_offset || ctx->stub) {
+		ctx->state |= RDA_FD_BYPASS;
+		UNLOCK(&ctx->lock);
+		goto bypass;
+	}
+
+	stub = fop_readdirp_stub(frame, rda_readdirp_stub, fd, size, off, xdata);
+	if (!stub) {
+		UNLOCK(&ctx->lock);
+		goto err;
+	}
+
+	/*
+	 * If we haven't bypassed the preload, this means we can either serve
+	 * the request out of the preload or the request that enables us to do
+	 * so is in flight...
+	 */
+	if (rda_can_serve_readdirp(ctx, size))
+		call_resume(stub);
+	else
+		ctx->stub = stub;
+
+	UNLOCK(&ctx->lock);
+
+	if (fill)
+		rda_fill_fd(frame, this, fd);
+
+	return 0;
+
+bypass:
+	STACK_WIND(frame, default_readdirp_cbk, FIRST_CHILD(this),
+		   FIRST_CHILD(this)->fops->readdirp, fd, size, off, xdata);
+	return 0;
+
+err:
+	STACK_UNWIND_STRICT(readdirp, frame, -1, ENOMEM, NULL, NULL);
+	return 0;
+}
+
+static int32_t
+rda_fill_fd_cbk(call_frame_t *frame, void *cookie, xlator_t *this,
+		 int32_t op_ret, int32_t op_errno, gf_dirent_t *entries,
+		 dict_t *xdata)
+{
+	gf_dirent_t *dirent, *tmp;
+	struct rda_local *local = frame->local;
+	struct rda_fd_ctx *ctx = local->ctx;
+	struct rda_priv *priv = this->private;
+	int fill = 1;
+
+	LOCK(&ctx->lock);
+
+	/* Verify that the preload buffer is still pending on this data. */
+	if (ctx->next_offset != local->offset) {
+		gf_log(this->name, GF_LOG_ERROR,
+			"Out of sequence directory preload.");
+		ctx->state |= (RDA_FD_BYPASS|RDA_FD_ERROR);
+		ctx->op_errno = EUCLEAN;
+
+		goto out;
+	}
+
+	if (entries) {
+		list_for_each_entry_safe(dirent, tmp, &entries->list, list) {
+			list_del_init(&dirent->list);
+			/* must preserve entry order */
+			list_add_tail(&dirent->list, &ctx->entries.list);
+
+			ctx->cur_size += gf_dirent_size(dirent->d_name);
+			ctx->next_offset = dirent->d_off;
+		}
+	}
+
+	if (ctx->cur_size >= priv->rda_high_wmark)
+		ctx->state &= ~RDA_FD_PLUGGED;
+
+	if (!op_ret) {
+		/* we've hit eod */
+		ctx->state &= ~RDA_FD_RUNNING;
+		ctx->state |= RDA_FD_EOD;
+	} else if (op_ret == -1) {
+		/* kill the preload and pend the error */
+		ctx->state &= ~RDA_FD_RUNNING;
+		ctx->state |= RDA_FD_ERROR;
+		ctx->op_errno = op_errno;
+	}
+
+	/*
+	 * NOTE: The strict bypass logic in readdirp() means a pending request
+	 * is always based on ctx->cur_offset.
+	 */
+	if (ctx->stub &&
+	    rda_can_serve_readdirp(ctx, ctx->stub->args.size)) {
+		call_resume(ctx->stub);
+		ctx->stub = NULL;
+	}
+
+out:
+	/*
+	 * If we have been marked for bypass and have no pending stub, clear the
+	 * run state so we stop preloading the context with entries.
+	 */
+	if ((ctx->state & RDA_FD_BYPASS) && !ctx->stub)
+		ctx->state &= ~RDA_FD_RUNNING;
+
+	if (!(ctx->state & RDA_FD_RUNNING)) {
+		fill = 0;
+		STACK_DESTROY(ctx->fill_frame->root);
+		ctx->fill_frame = NULL;
+	}
+
+	UNLOCK(&ctx->lock);
+
+	if (fill)
+		rda_fill_fd(frame, this, local->fd);
+
+	return 0;
+}
+
+/*
+ * Start prepopulating the fd context with directory entries.
+ */
+static int
+rda_fill_fd(call_frame_t *frame, xlator_t *this, fd_t *fd)
+{
+	call_frame_t *nframe = NULL;
+	struct rda_local *local = NULL;
+	struct rda_fd_ctx *ctx;
+	off_t offset;
+	struct rda_priv *priv = this->private;
+
+	ctx = get_rda_fd_ctx(fd, this);
+	if (!ctx)
+		goto err;
+
+	LOCK(&ctx->lock);
+
+	if (ctx->state & RDA_FD_NEW) {
+		ctx->state &= ~RDA_FD_NEW;
+		ctx->state |= RDA_FD_RUNNING;
+		if (priv->rda_low_wmark)
+			ctx->state |= RDA_FD_PLUGGED;
+	}
+
+	offset = ctx->next_offset;
+
+	if (!ctx->fill_frame) {
+		nframe = copy_frame(frame);
+		if (!nframe) {
+			UNLOCK(&ctx->lock);
+			goto err;
+		}
+
+		local = mem_get0(this->local_pool);
+		if (!local) {
+			UNLOCK(&ctx->lock);
+			goto err;
+		}
+
+		local->ctx = ctx;
+		local->fd = fd;
+		nframe->local = local;
+
+		ctx->fill_frame = nframe;
+	} else {
+		nframe = ctx->fill_frame;
+		local = nframe->local;
+	}
+
+	local->offset = offset;
+
+	UNLOCK(&ctx->lock);
+
+	STACK_WIND(nframe, rda_fill_fd_cbk, FIRST_CHILD(this),
+		   FIRST_CHILD(this)->fops->readdirp, fd, priv->rda_req_size,
+		   offset, NULL);
+
+	return 0;
+
+err:
+	if (nframe)
+		FRAME_DESTROY(nframe);
+
+	return -1;
+}
+
+static int32_t
+rda_opendir_cbk(call_frame_t *frame, void *cookie, xlator_t *this,
+		    int32_t op_ret, int32_t op_errno, fd_t *fd, dict_t *xdata)
+{
+	if (!op_ret)
+		rda_fill_fd(frame, this, fd);
+
+	STACK_UNWIND_STRICT(opendir, frame, op_ret, op_errno, fd, xdata);
+	return 0;
+}
+
+static int32_t
+rda_opendir(call_frame_t *frame, xlator_t *this, loc_t *loc, fd_t *fd,
+		dict_t *xdata)
+{
+	STACK_WIND(frame, rda_opendir_cbk, FIRST_CHILD(this),
+		   FIRST_CHILD(this)->fops->opendir, loc, fd, xdata);
+	return 0;
+}
+
+static int32_t
+rda_releasedir(xlator_t *this, fd_t *fd)
+{
+	uint64_t val;
+	struct rda_fd_ctx *ctx;
+
+	if (fd_ctx_del(fd, this, &val) < 0)
+		return -1;
+
+	ctx = (struct rda_fd_ctx *) val;
+	if (!ctx)
+		return 0;
+
+	rda_reset_ctx(ctx);
+
+	if (ctx->fill_frame)
+		STACK_DESTROY(ctx->fill_frame->root);
+
+	if (ctx->stub)
+		gf_log(this->name, GF_LOG_ERROR,
+			"released a directory with a pending stub");
+
+	GF_FREE(ctx);
+	return 0;
+}
+
+int32_t
+mem_acct_init(xlator_t *this)
+{
+	int ret = -1;
+
+	if (!this)
+		goto out;
+
+	ret = xlator_mem_acct_init(this, gf_rda_mt_end + 1);
+
+	if (ret != 0)
+		gf_log(this->name, GF_LOG_ERROR, "Memory accounting init"
+		       "failed");
+
+out:
+	return ret;
+}
+
+int
+reconfigure(xlator_t *this, dict_t *options)
+{
+	struct rda_priv *priv = this->private;
+
+	GF_OPTION_RECONF("rda-request-size", priv->rda_req_size, options,
+			 uint32, err);
+	GF_OPTION_RECONF("rda-low-wmark", priv->rda_low_wmark, options, size,
+			 err);
+	GF_OPTION_RECONF("rda-high-wmark", priv->rda_high_wmark, options, size,
+			 err);
+
+	return 0;
+err:
+	return -1;
+}
+
+int
+init(xlator_t *this)
+{
+	struct rda_priv *priv = NULL;
+
+        GF_VALIDATE_OR_GOTO("readdir-ahead", this, err);
+
+        if (!this->children || this->children->next) {
+                gf_log(this->name,  GF_LOG_ERROR,
+                        "FATAL: readdir-ahead not configured with exactly one"
+                        " child");
+                goto err;
+        }
+
+        if (!this->parents) {
+                gf_log(this->name, GF_LOG_WARNING,
+                        "dangling volume. check volfile ");
+        }
+
+	priv = GF_CALLOC(1, sizeof(struct rda_priv), gf_rda_mt_rda_priv);
+	if (!priv)
+		goto err;
+	this->private = priv;
+
+	this->local_pool = mem_pool_new(struct rda_local, 32);
+	if (!this->local_pool)
+		goto err;
+
+	GF_OPTION_INIT("rda-request-size", priv->rda_req_size, uint32, err);
+	GF_OPTION_INIT("rda-low-wmark", priv->rda_low_wmark, size, err);
+	GF_OPTION_INIT("rda-high-wmark", priv->rda_high_wmark, size, err);
+
+	return 0;
+
+err:
+	if (this->local_pool)
+		mem_pool_destroy(this->local_pool);
+	if (priv)
+		GF_FREE(priv);
+
+        return -1;
+}
+
+
+void
+fini(xlator_t *this)
+{
+        GF_VALIDATE_OR_GOTO ("readdir-ahead", this, out);
+
+	GF_FREE(this->private);
+
+out:
+        return;
+}
+
+struct xlator_fops fops = {
+	.opendir	= rda_opendir,
+	.readdirp	= rda_readdirp,
+};
+
+struct xlator_cbks cbks = {
+	.releasedir	= rda_releasedir,
+};
+
+struct volume_options options[] = {
+	{ .key = {"rda-request-size"},
+	  .type = GF_OPTION_TYPE_INT,
+	  .min = 4096,
+	  .max = 131072,
+	  .default_value = "131072",
+	  .description = "readdir-ahead request size",
+	},
+	{ .key = {"rda-low-wmark"},
+	  .type = GF_OPTION_TYPE_SIZET,
+	  .min = 0,
+	  .max = 10 * GF_UNIT_MB,
+	  .default_value = "4096",
+	  .description = "the value under which we plug",
+	},
+	{ .key = {"rda-high-wmark"},
+	  .type = GF_OPTION_TYPE_SIZET,
+	  .min = 0,
+	  .max = 100 * GF_UNIT_MB,
+	  .default_value = "131072",
+	  .description = "the value over which we unplug",
+	},
+        { .key = {NULL} },
+};
+
diff --git a/xlators/performance/readdir-ahead/src/readdir-ahead.h b/xlators/performance/readdir-ahead/src/readdir-ahead.h
new file mode 100644
index 000000000..e48786dae
--- /dev/null
+++ b/xlators/performance/readdir-ahead/src/readdir-ahead.h
@@ -0,0 +1,46 @@
+/*
+  Copyright (c) 2008-2013 Red Hat, Inc. <http://www.redhat.com>
+  This file is part of GlusterFS.
+
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
+*/
+
+#ifndef __READDIR_AHEAD_H
+#define __READDIR_AHEAD_H
+
+/* state flags */
+#define RDA_FD_NEW	(1 << 0)
+#define RDA_FD_RUNNING	(1 << 1)
+#define RDA_FD_EOD	(1 << 2)
+#define RDA_FD_ERROR	(1 << 3)
+#define RDA_FD_BYPASS	(1 << 4)
+#define RDA_FD_PLUGGED	(1 << 5)
+
+struct rda_fd_ctx {
+	off_t cur_offset;	/* current head of the ctx */
+	size_t cur_size;	/* current size of the preload */
+	off_t next_offset;	/* tail of the ctx */
+	uint32_t state;
+	gf_lock_t lock;
+	gf_dirent_t entries;
+	call_frame_t *fill_frame;
+	call_stub_t *stub;
+	int op_errno;
+};
+
+struct rda_local {
+	struct rda_fd_ctx *ctx;
+	fd_t *fd;
+	off_t offset;
+};
+
+struct rda_priv {
+	uint32_t rda_req_size;
+	uint64_t rda_low_wmark;
+	uint64_t rda_high_wmark;
+};
+
+#endif /* __READDIR_AHEAD_H */
diff --git a/xlators/performance/write-behind/src/write-behind.c b/xlators/performance/write-behind/src/write-behind.c
index 055eed677..95c5921c6 100644
--- a/xlators/performance/write-behind/src/write-behind.c
+++ b/xlators/performance/write-behind/src/write-behind.c
@@ -213,11 +213,7 @@ wb_fd_err (fd_t *fd, xlator_t *this, int32_t *op_errno)
         int32_t      tmp   = 0;
 
 	if (fd_ctx_get (fd, this, &value) == 0) {
-                if (value != EBADF) {
-                        fd_ctx_set (fd, this, EBADF);
-                }
-
-                if (op_errno != NULL) {
+                if (op_errno) {
                         tmp = value;
                         *op_errno = tmp;
                 }
@@ -749,7 +745,7 @@ wb_fulfill_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
 	} while (0)
 
 
-void
+int
 wb_fulfill_head (wb_inode_t *wb_inode, wb_request_t *head)
 {
 	struct iovec  vector[MAX_VECTOR_COUNT];
@@ -799,22 +795,23 @@ wb_fulfill_head (wb_inode_t *wb_inode, wb_request_t *head)
 		    head->stub->args.flags,
 		    head->stub->args.iobref, NULL);
 
-	return;
+	return 0;
 err:
         if (!fderr) {
                 /* frame creation failure */
-                wb_fulfill_err (head, ENOMEM);
+                fderr = ENOMEM;
+                wb_fulfill_err (head, fderr);
         }
 
 	wb_head_done (head);
 
-	return;
+	return fderr;
 }
 
 
 #define NEXT_HEAD(head, req) do {					\
 		if (head)						\
-			wb_fulfill_head (wb_inode, head);		\
+			ret |= wb_fulfill_head (wb_inode, head);	\
 		head = req;						\
 		expected_offset = req->stub->args.offset +		\
 			req->write_size;				\
@@ -823,7 +820,7 @@ err:
 	} while (0)
 
 
-void
+int
 wb_fulfill (wb_inode_t *wb_inode, list_head_t *liabilities)
 {
 	wb_request_t  *req     = NULL;
@@ -833,6 +830,7 @@ wb_fulfill (wb_inode_t *wb_inode, list_head_t *liabilities)
 	off_t          expected_offset = 0;
 	size_t         curr_aggregate = 0;
 	size_t         vector_count = 0;
+        int            ret          = 0;
 
 	conf = wb_inode->this->private;
 
@@ -876,8 +874,9 @@ wb_fulfill (wb_inode_t *wb_inode, list_head_t *liabilities)
 	}
 
 	if (head)
-		wb_fulfill_head (wb_inode, head);
-	return;
+		ret |= wb_fulfill_head (wb_inode, head);
+
+	return ret;
 }
 
 
@@ -1162,27 +1161,35 @@ wb_process_queue (wb_inode_t *wb_inode)
         list_head_t tasks  = {0, };
 	list_head_t lies = {0, };
 	list_head_t liabilities = {0, };
+        int         retry       = 0;
 
         INIT_LIST_HEAD (&tasks);
         INIT_LIST_HEAD (&lies);
         INIT_LIST_HEAD (&liabilities);
 
-        LOCK (&wb_inode->lock);
-        {
-		__wb_preprocess_winds (wb_inode);
+        do {
+                LOCK (&wb_inode->lock);
+                {
+                        __wb_preprocess_winds (wb_inode);
 
-		__wb_pick_winds (wb_inode, &tasks, &liabilities);
+                        __wb_pick_winds (wb_inode, &tasks, &liabilities);
 
-                __wb_pick_unwinds (wb_inode, &lies);
+                        __wb_pick_unwinds (wb_inode, &lies);
 
-        }
-        UNLOCK (&wb_inode->lock);
+                }
+                UNLOCK (&wb_inode->lock);
 
-	wb_do_unwinds (wb_inode, &lies);
+                wb_do_unwinds (wb_inode, &lies);
 
-	wb_do_winds (wb_inode, &tasks);
+                wb_do_winds (wb_inode, &tasks);
 
-	wb_fulfill (wb_inode, &liabilities);
+                /* fd might've been marked bad due to previous errors.
+                 * Since, caller of wb_process_queue might be the last fop on
+                 * inode, make sure we keep processing request queue, till there
+                 * are no requests left.
+                 */
+                retry = wb_fulfill (wb_inode, &liabilities);
+        } while (retry);
 
         return;
 }
@@ -1194,12 +1201,17 @@ wb_writev_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
 	       struct iatt *prebuf, struct iatt *postbuf, dict_t *xdata)
 {
 	wb_request_t *req = NULL;
+	wb_inode_t *wb_inode;
 
 	req = frame->local;
 	frame->local = NULL;
+	wb_inode = req->wb_inode;
 
 	wb_request_unref (req);
 
+	/* requests could be pending while this was in progress */
+	wb_process_queue(wb_inode);
+
 	STACK_UNWIND_STRICT (writev, frame, op_ret, op_errno, prebuf, postbuf,
 			     xdata);
 	return 0;
@@ -1249,8 +1261,7 @@ wb_writev (call_frame_t *frame, xlator_t *this, fd_t *fd, struct iovec *vector,
 	if (fd->flags & (O_SYNC|O_DSYNC|o_direct))
 		wb_disabled = 1;
 
-	if (flags & (O_SYNC|O_DSYNC|O_DIRECT))
-		/* O_DIRECT flag in params of writev must _always_ be honored */
+	if (flags & (O_SYNC|O_DSYNC|o_direct))
 		wb_disabled = 1;
 
 	if (wb_disabled)
@@ -1409,7 +1420,7 @@ wb_flush (call_frame_t *frame, xlator_t *this, fd_t *fd, dict_t *xdata)
 	if (!wb_enqueue (wb_inode, stub))
 		goto unwind;
 
-	wb_process_queue (wb_inode);
+        wb_process_queue (wb_inode);
 
         return 0;
 
diff --git a/xlators/playground/Makefile.am b/xlators/playground/Makefile.am
new file mode 100644
index 000000000..e7de6b31a
--- /dev/null
+++ b/xlators/playground/Makefile.am
@@ -0,0 +1,2 @@
+SUBDIRS = template
+CLEANFILES =
diff --git a/xlators/playground/template/Makefile.am b/xlators/playground/template/Makefile.am
new file mode 100644
index 000000000..f26892443
--- /dev/null
+++ b/xlators/playground/template/Makefile.am
@@ -0,0 +1,2 @@
+SUBDIRS = src
+
diff --git a/xlators/playground/template/src/Makefile.am b/xlators/playground/template/src/Makefile.am
new file mode 100644
index 000000000..21f1c5f6b
--- /dev/null
+++ b/xlators/playground/template/src/Makefile.am
@@ -0,0 +1,16 @@
+xlator_LTLIBRARIES = template.la
+xlatordir = $(libdir)/glusterfs/$(PACKAGE_VERSION)/xlator/testing/features
+
+template_la_LDFLAGS = -module -avoid-version
+
+template_la_SOURCES = template.c
+template_la_LIBADD = $(top_builddir)/libglusterfs/src/libglusterfs.la
+
+noinst_HEADERS = template.h
+
+AM_CPPFLAGS = $(GF_CPPFLAGS) -I$(top_srcdir)/libglusterfs/src
+
+AM_CFLAGS = -Wall $(GF_CFLAGS)
+
+CLEANFILES =
+
diff --git a/xlators/playground/template/src/template.c b/xlators/playground/template/src/template.c
new file mode 100644
index 000000000..37a7794a0
--- /dev/null
+++ b/xlators/playground/template/src/template.c
@@ -0,0 +1,49 @@
+/*
+   Copyright (c) 2006-2012 Red Hat, Inc. <http://www.redhat.com>
+   This file is part of GlusterFS.
+
+   This file is licensed to you under your choice of the GNU Lesser
+   General Public License, version 3 or any later version (LGPLv3 or
+   later), or the GNU General Public License, version 2 (GPLv2), in all
+   cases as published by the Free Software Foundation.
+*/
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+
+#include "template.h"
+
+int32_t
+init (xlator_t *this)
+{
+
+        if (!this->children || this->children->next) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "not configured with exactly one child. exiting");
+                return -1;
+        }
+
+        if (!this->parents) {
+                gf_log (this->name, GF_LOG_WARNING,
+                        "dangling volume. check volfile ");
+        }
+
+        return 0;
+}
+
+void
+fini (xlator_t *this)
+{
+        return;
+}
+
+struct xlator_fops fops = {
+};
+
+struct xlator_cbks cbks = {
+};
+
+struct volume_options options[] = {
+        { .key  = {NULL} },
+};
diff --git a/xlators/playground/template/src/template.h b/xlators/playground/template/src/template.h
new file mode 100644
index 000000000..d6aced501
--- /dev/null
+++ b/xlators/playground/template/src/template.h
@@ -0,0 +1,24 @@
+/*
+   Copyright (c) 2013 Red Hat, Inc. <http://www.redhat.com>
+   This file is part of GlusterFS.
+
+   This file is licensed to you under your choice of the GNU Lesser
+   General Public License, version 3 or any later version (LGPLv3 or
+   later), or the GNU General Public License, version 2 (GPLv2), in all
+   cases as published by the Free Software Foundation.
+*/
+#ifndef __TEMPLATE_H__
+#define __TEMPLATE_H__
+
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+
+#include "glusterfs.h"
+#include "logging.h"
+#include "dict.h"
+#include "xlator.h"
+#include "defaults.h"
+
+#endif /* __TEMPLATE_H__ */
diff --git a/xlators/protocol/auth/addr/src/addr.c b/xlators/protocol/auth/addr/src/addr.c
index 199fc6db0..64e8d0fc6 100644
--- a/xlators/protocol/auth/addr/src/addr.c
+++ b/xlators/protocol/auth/addr/src/addr.c
@@ -2,19 +2,10 @@
   Copyright (c) 2008-2012 Red Hat, Inc. <http://www.redhat.com>
   This file is part of GlusterFS.
 
-  GlusterFS is free software; you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published
-  by the Free Software Foundation; either version 3 of the License,
-  or (at your option) any later version.
-
-  GlusterFS is distributed in the hope that it will be useful, but
-  WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-  General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see
-  <http://www.gnu.org/licenses/>.
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
 */
 
 
diff --git a/xlators/protocol/auth/login/src/login.c b/xlators/protocol/auth/login/src/login.c
index 702a876ac..c2f0bf0d0 100644
--- a/xlators/protocol/auth/login/src/login.c
+++ b/xlators/protocol/auth/login/src/login.c
@@ -2,19 +2,10 @@
   Copyright (c) 2008-2012 Red Hat, Inc. <http://www.redhat.com>
   This file is part of GlusterFS.
 
-  GlusterFS is free software; you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published
-  by the Free Software Foundation; either version 3 of the License,
-  or (at your option) any later version.
-
-  GlusterFS is distributed in the hope that it will be useful, but
-  WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-  General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see
-  <http://www.gnu.org/licenses/>.
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
 */
 
 #ifndef _CONFIG_H
diff --git a/xlators/protocol/client/src/client-handshake.c b/xlators/protocol/client/src/client-handshake.c
index ff0e162c6..5668fea53 100644
--- a/xlators/protocol/client/src/client-handshake.c
+++ b/xlators/protocol/client/src/client-handshake.c
@@ -53,7 +53,7 @@ rpc_client_ping_timer_expired (void *data)
         rpc_clnt_connection_t   *conn               = NULL;
         int                      disconnect         = 0;
         int                      transport_activity = 0;
-        struct timeval           timeout            = {0, };
+        struct timespec          timeout            = {0, };
         struct timeval           current            = {0, };
         struct rpc_clnt         *clnt               = NULL;
         xlator_t                *this               = NULL;
@@ -101,7 +101,7 @@ rpc_client_ping_timer_expired (void *data)
                                 "ping timer expired but transport activity "
                                 "detected - not bailing transport");
                         timeout.tv_sec = conf->opt.ping_timeout;
-                        timeout.tv_usec = 0;
+                        timeout.tv_nsec = 0;
 
                         conn->ping_timer =
                                 gf_timer_call_after (this->ctx, timeout,
@@ -140,7 +140,7 @@ client_start_ping (void *data)
         clnt_conf_t             *conf        = NULL;
         rpc_clnt_connection_t   *conn        = NULL;
         int32_t                  ret         = -1;
-        struct timeval           timeout     = {0, };
+        struct timespec          timeout     = {0, };
         call_frame_t            *frame       = NULL;
         int                      frame_count = 0;
 
@@ -196,7 +196,7 @@ client_start_ping (void *data)
                 }
 
                 timeout.tv_sec = conf->opt.ping_timeout;
-                timeout.tv_usec = 0;
+                timeout.tv_nsec = 0;
 
                 conn->ping_timer =
                         gf_timer_call_after (this->ctx, timeout,
@@ -241,7 +241,7 @@ client_ping_cbk (struct rpc_req *req, struct iovec *iov, int count,
 {
         xlator_t              *this    = NULL;
         rpc_clnt_connection_t *conn    = NULL;
-        struct timeval         timeout = {0, };
+        struct timespec        timeout = {0, };
         call_frame_t          *frame   = NULL;
         clnt_conf_t           *conf    = NULL;
 
@@ -281,7 +281,7 @@ client_ping_cbk (struct rpc_req *req, struct iovec *iov, int count,
 
 
                 timeout.tv_sec  = conf->opt.ping_timeout;
-                timeout.tv_usec = 0;
+                timeout.tv_nsec = 0;
 
                 gf_timer_call_cancel (this->ctx,
                                       conn->ping_timer);
@@ -1744,6 +1744,7 @@ client_query_portmap_cbk (struct rpc_req *req, struct iovec *iov, int count, voi
         }
 
         conf->portmap_err_logged = 0;
+        conf->disconnect_err_logged = 0;
 
         config.remote_port = rsp.port;
         rpc_clnt_reconfig (conf->rpc, &config);
diff --git a/xlators/protocol/client/src/client-rpc-fops.c b/xlators/protocol/client/src/client-rpc-fops.c
index f524c1a37..6355450c3 100644
--- a/xlators/protocol/client/src/client-rpc-fops.c
+++ b/xlators/protocol/client/src/client-rpc-fops.c
@@ -185,8 +185,7 @@ out:
                 gf_log (this->name, GF_LOG_WARNING,
                         "remote operation failed: %s. Path: (%s to %s)",
                         strerror (gf_error_to_errno (rsp.op_errno)),
-                        (local) ? local->loc.path : "--",
-                        (local) ? local->loc2.path: "--");
+                        local->loc.path, local->loc2.path);
         }
 
         CLIENT_STACK_UNWIND (symlink, frame, rsp.op_ret,
@@ -252,11 +251,9 @@ client3_3_mknod_cbk (struct rpc_req *req, struct iovec *iov, int count,
 out:
         if (rsp.op_ret == -1) {
                 gf_log (this->name, GF_LOG_WARNING,
-                        "remote operation failed: %s. Path: %s (%s)",
+                        "remote operation failed: %s. Path: %s",
                         strerror (gf_error_to_errno (rsp.op_errno)),
-                        (local) ? local->loc.path : "--",
-                        (local && local->loc.inode) ?
-                        uuid_utoa (local->loc.inode->gfid) : "--");
+                        local->loc.path);
         }
 
         CLIENT_STACK_UNWIND (mknod, frame, rsp.op_ret,
@@ -320,11 +317,9 @@ client3_3_mkdir_cbk (struct rpc_req *req, struct iovec *iov, int count,
 out:
         if (rsp.op_ret == -1) {
                 gf_log (this->name, GF_LOG_WARNING,
-                        "remote operation failed: %s. Path: %s (%s)",
+                        "remote operation failed: %s. Path: %s",
                         strerror (gf_error_to_errno (rsp.op_errno)),
-                        (local) ? local->loc.path : "--",
-                        (local && local->loc.inode) ?
-                        uuid_utoa (local->loc.inode->gfid) : "--");
+                        local->loc.path);
         }
 
         CLIENT_STACK_UNWIND (mkdir, frame, rsp.op_ret,
@@ -466,9 +461,7 @@ out:
                 gf_log (this->name, GF_LOG_WARNING,
                         "remote operation failed: %s. Path: %s (%s)",
                         strerror (gf_error_to_errno (rsp.op_errno)),
-                        (local) ? local->loc.path : "--",
-                        (local && local->loc.inode) ?
-                        uuid_utoa (local->loc.inode->gfid) : "--");
+                        local->loc.path, loc_gfid_utoa (&local->loc));
         }
 
         CLIENT_STACK_UNWIND (open, frame, rsp.op_ret,
@@ -1106,10 +1099,8 @@ out:
                                      GF_LOG_DEBUG : GF_LOG_WARNING),
                         "remote operation failed: %s. Path: %s (%s). Key: %s",
                         strerror (op_errno),
-                        (local) ? local->loc.path : "--",
-                        (local && local->loc.inode) ?
-                        uuid_utoa (local->loc.inode->gfid) : "--",
-                        (local) ? local->name : "(null)");
+                        local->loc.path, loc_gfid_utoa (&local->loc),
+                        (local->name) ? local->name : "(null)");
         }
 
         CLIENT_STACK_UNWIND (getxattr, frame, rsp.op_ret, op_errno, dict, xdata);
@@ -1750,9 +1741,7 @@ out:
                 gf_log (this->name, GF_LOG_WARNING,
                         "remote operation failed: %s. Path: %s (%s)",
                         strerror (gf_error_to_errno (rsp.op_errno)),
-                        (local) ? local->loc.path : "--",
-                        (local && local->loc.inode) ?
-                        uuid_utoa (local->loc.inode->gfid) : "--");
+                        local->loc.path, loc_gfid_utoa (&local->loc));
         }
 
         CLIENT_STACK_UNWIND (xattrop, frame, rsp.op_ret,
@@ -1947,6 +1936,172 @@ out:
         return 0;
 }
 
+int
+client3_3_fallocate_cbk (struct rpc_req *req, struct iovec *iov, int count,
+                        void *myframe)
+{
+        call_frame_t    *frame      = NULL;
+        gfs3_fallocate_rsp rsp      = {0,};
+        struct iatt      prestat    = {0,};
+        struct iatt      poststat   = {0,};
+        int              ret        = 0;
+        xlator_t *this       = NULL;
+        dict_t  *xdata       = NULL;
+
+
+        this = THIS;
+
+        frame = myframe;
+
+        if (-1 == req->rpc_status) {
+                rsp.op_ret   = -1;
+                rsp.op_errno = ENOTCONN;
+                goto out;
+        }
+        ret = xdr_to_generic (*iov, &rsp, (xdrproc_t)xdr_gfs3_fallocate_rsp);
+        if (ret < 0) {
+                gf_log (this->name, GF_LOG_ERROR, "XDR decoding failed");
+                rsp.op_ret   = -1;
+                rsp.op_errno = EINVAL;
+                goto out;
+        }
+
+        if (-1 != rsp.op_ret) {
+                gf_stat_to_iatt (&rsp.statpre, &prestat);
+                gf_stat_to_iatt (&rsp.statpost, &poststat);
+        }
+
+        GF_PROTOCOL_DICT_UNSERIALIZE (this, xdata, (rsp.xdata.xdata_val),
+                                      (rsp.xdata.xdata_len), ret,
+                                      rsp.op_errno, out);
+
+out:
+        if (rsp.op_ret == -1) {
+                gf_log (this->name, GF_LOG_WARNING, "remote operation failed: %s",
+                        strerror (gf_error_to_errno (rsp.op_errno)));
+        }
+        CLIENT_STACK_UNWIND (fallocate, frame, rsp.op_ret,
+                             gf_error_to_errno (rsp.op_errno), &prestat,
+                             &poststat, xdata);
+
+        free (rsp.xdata.xdata_val);
+
+        if (xdata)
+                dict_unref (xdata);
+
+        return 0;
+}
+
+int
+client3_3_discard_cbk(struct rpc_req *req, struct iovec *iov, int count,
+		      void *myframe)
+{
+        call_frame_t    *frame      = NULL;
+        gfs3_discard_rsp rsp      = {0,};
+        struct iatt      prestat    = {0,};
+        struct iatt      poststat   = {0,};
+        int              ret        = 0;
+        xlator_t *this       = NULL;
+        dict_t  *xdata       = NULL;
+
+        this = THIS;
+
+        frame = myframe;
+
+        if (-1 == req->rpc_status) {
+                rsp.op_ret   = -1;
+                rsp.op_errno = ENOTCONN;
+                goto out;
+        }
+        ret = xdr_to_generic(*iov, &rsp, (xdrproc_t) xdr_gfs3_discard_rsp);
+        if (ret < 0) {
+                gf_log (this->name, GF_LOG_ERROR, "XDR decoding failed");
+                rsp.op_ret   = -1;
+                rsp.op_errno = EINVAL;
+                goto out;
+        }
+
+        if (-1 != rsp.op_ret) {
+                gf_stat_to_iatt (&rsp.statpre, &prestat);
+                gf_stat_to_iatt (&rsp.statpost, &poststat);
+        }
+
+        GF_PROTOCOL_DICT_UNSERIALIZE (this, xdata, (rsp.xdata.xdata_val),
+                                      (rsp.xdata.xdata_len), ret,
+                                      rsp.op_errno, out);
+
+out:
+        if (rsp.op_ret == -1) {
+                gf_log (this->name, GF_LOG_WARNING, "remote operation failed: %s",
+                        strerror (gf_error_to_errno (rsp.op_errno)));
+        }
+        CLIENT_STACK_UNWIND (discard, frame, rsp.op_ret,
+                             gf_error_to_errno (rsp.op_errno), &prestat,
+                             &poststat, xdata);
+
+        free (rsp.xdata.xdata_val);
+
+        if (xdata)
+                dict_unref (xdata);
+
+        return 0;
+}
+
+int
+client3_3_zerofill_cbk(struct rpc_req *req, struct iovec *iov, int count,
+                      void *myframe)
+{
+        call_frame_t    *frame         = NULL;
+        gfs3_zerofill_rsp rsp          = {0,};
+        struct iatt      prestat       = {0,};
+        struct iatt      poststat      = {0,};
+        int              ret           = 0;
+        xlator_t *this                 = NULL;
+        dict_t  *xdata                 = NULL;
+
+        this = THIS;
+
+        frame = myframe;
+
+        if (-1 == req->rpc_status) {
+                rsp.op_ret   = -1;
+                rsp.op_errno = ENOTCONN;
+                goto out;
+        }
+        ret = xdr_to_generic(*iov, &rsp, (xdrproc_t) xdr_gfs3_zerofill_rsp);
+        if (ret < 0) {
+                gf_log (this->name, GF_LOG_ERROR, "XDR decoding failed");
+                rsp.op_ret   = -1;
+                rsp.op_errno = EINVAL;
+                goto out;
+        }
+
+        if (-1 != rsp.op_ret) {
+                gf_stat_to_iatt (&rsp.statpre, &prestat);
+                gf_stat_to_iatt (&rsp.statpost, &poststat);
+        }
+
+        GF_PROTOCOL_DICT_UNSERIALIZE (this, xdata, (rsp.xdata.xdata_val),
+                                      (rsp.xdata.xdata_len), ret,
+                                      rsp.op_errno, out);
+
+out:
+        if (rsp.op_ret == -1) {
+                gf_log (this->name, GF_LOG_WARNING,
+                        "remote operation failed: %s",
+                        strerror (gf_error_to_errno (rsp.op_errno)));
+        }
+        CLIENT_STACK_UNWIND (zerofill, frame, rsp.op_ret,
+                             gf_error_to_errno (rsp.op_errno), &prestat,
+                             &poststat, xdata);
+
+        free (rsp.xdata.xdata_val);
+
+        if (xdata)
+                dict_unref (xdata);
+
+        return 0;
+}
 
 int
 client3_3_setattr_cbk (struct rpc_req *req, struct iovec *iov, int count,
@@ -2064,11 +2219,9 @@ client3_3_create_cbk (struct rpc_req *req, struct iovec *iov, int count,
 out:
         if (rsp.op_ret == -1) {
                 gf_log (this->name, GF_LOG_WARNING,
-                        "remote operation failed: %s. Path: %s (%s)",
+                        "remote operation failed: %s. Path: %s",
                         strerror (gf_error_to_errno (rsp.op_errno)),
-                        (local) ? local->loc.path : "--",
-                        (local && local->loc.inode) ?
-                        uuid_utoa (local->loc.inode->gfid) : "--");
+                        local->loc.path);
         }
 
         CLIENT_STACK_UNWIND (create, frame, rsp.op_ret,
@@ -2463,10 +2616,7 @@ out:
                 gf_log (this->name, GF_LOG_WARNING,
                         "remote operation failed: %s (%s -> %s)",
                         strerror (gf_error_to_errno (rsp.op_errno)),
-                        (local) ? ((local->loc.path)? local->loc.path :
-                                   uuid_utoa (local->loc.inode->gfid)) : "--",
-                        (local) ? ((local->loc2.path)? local->loc2.path :
-                                   local->loc2.name) : "--");
+                        local->loc.path, local->loc2.path);
         }
 
         CLIENT_STACK_UNWIND (link, frame, rsp.op_ret,
@@ -2536,9 +2686,7 @@ out:
                 gf_log (this->name, GF_LOG_WARNING,
                         "remote operation failed: %s. Path: %s (%s)",
                         strerror (gf_error_to_errno (rsp.op_errno)),
-                        (local) ? local->loc.path : "--",
-                        (local && local->loc.inode) ?
-                        uuid_utoa (local->loc.inode->gfid) : "--");
+                        local->loc.path, loc_gfid_utoa (&local->loc));
         }
         CLIENT_STACK_UNWIND (opendir, frame, rsp.op_ret,
                              gf_error_to_errno (rsp.op_errno), fd, xdata);
@@ -2618,10 +2766,8 @@ out:
                 if (rsp.op_errno != ENOENT)
                         gf_log (this->name, GF_LOG_WARNING,
                                 "remote operation failed: %s. Path: %s (%s)",
-                                strerror (rsp.op_errno),
-                                (local) ? local->loc.path : "--",
-                                (local && local->loc.inode) ?
-                                uuid_utoa (local->loc.inode->gfid) : "--");
+                                strerror (rsp.op_errno), local->loc.path,
+                                loc_gfid_utoa (&local->loc));
                 else
                         gf_log (this->name, GF_LOG_TRACE, "not found on remote node");
 
@@ -2777,7 +2923,7 @@ client_fdctx_destroy (xlator_t *this, clnt_fd_ctx_t *fdctx)
         if (fdctx->is_dir) {
                 gfs3_releasedir_req  req = {{0,},};
                 req.fd = fdctx->remote_fd;
-                gf_log (this->name, GF_LOG_DEBUG, "sending releasedir on fd");
+                gf_log (this->name, GF_LOG_TRACE, "sending releasedir on fd");
                 client_submit_request (this, &req, fr, &clnt3_3_fop_prog,
                                        GFS3_OP_RELEASEDIR,
                                        client3_3_releasedir_cbk,
@@ -2786,7 +2932,7 @@ client_fdctx_destroy (xlator_t *this, clnt_fd_ctx_t *fdctx)
         } else {
                 gfs3_release_req  req = {{0,},};
                 req.fd = fdctx->remote_fd;
-                gf_log (this->name, GF_LOG_DEBUG, "sending release on fd");
+                gf_log (this->name, GF_LOG_TRACE, "sending release on fd");
                 client_submit_request (this, &req, fr, &clnt3_3_fop_prog,
                                        GFS3_OP_RELEASE,
                                        client3_3_release_cbk, NULL,
@@ -2926,6 +3072,7 @@ client3_3_lookup (call_frame_t *frame, xlator_t *this,
                 goto unwind;
 
         loc_copy (&local->loc, args->loc);
+        loc_path (&local->loc, NULL);
         frame->local = local;
 
         if (args->loc->parent) {
@@ -3442,6 +3589,7 @@ client3_3_symlink (call_frame_t *frame, xlator_t *this,
                 goto unwind;
 
         loc_copy (&local->loc, args->loc);
+        loc_path (&local->loc, NULL);
 
         if (!uuid_is_null (args->loc->parent->gfid))
                 memcpy (req.pargfid,  args->loc->parent->gfid, 16);
@@ -3591,7 +3739,9 @@ client3_3_link (call_frame_t *frame, xlator_t *this,
         }
 
         loc_copy (&local->loc, args->oldloc);
+        loc_path (&local->loc, NULL);
         loc_copy (&local->loc2, args->newloc);
+        loc_path (&local->loc2, NULL);
         frame->local = local;
 
         req.newbname = (char *)args->newloc->name;
@@ -3646,6 +3796,7 @@ client3_3_mknod (call_frame_t *frame, xlator_t *this,
                 goto unwind;
 
         loc_copy (&local->loc, args->loc);
+        loc_path (&local->loc, NULL);
         frame->local = local;
 
         if (!uuid_is_null (args->loc->parent->gfid))
@@ -3713,6 +3864,7 @@ client3_3_mkdir (call_frame_t *frame, xlator_t *this,
                 goto unwind;
 
         loc_copy (&local->loc, args->loc);
+        loc_path (&local->loc, NULL);
         frame->local = local;
 
         if (!uuid_is_null (args->loc->parent->gfid))
@@ -3781,6 +3933,7 @@ client3_3_create (call_frame_t *frame, xlator_t *this,
         local->flags = args->flags;
 
         loc_copy (&local->loc, args->loc);
+        loc_path (&local->loc, NULL);
         frame->local = local;
 
         if (!uuid_is_null (args->loc->parent->gfid))
@@ -3850,6 +4003,7 @@ client3_3_open (call_frame_t *frame, xlator_t *this,
         local->fd = fd_ref (args->fd);
         local->flags = args->flags;
         loc_copy (&local->loc, args->loc);
+        loc_path (&local->loc, NULL);
         frame->local = local;
 
         if (!uuid_is_null (args->loc->inode->gfid))
@@ -4238,6 +4392,7 @@ client3_3_opendir (call_frame_t *frame, xlator_t *this,
 
         local->fd = fd_ref (args->fd);
         loc_copy (&local->loc, args->loc);
+        loc_path (&local->loc, NULL);
         frame->local = local;
 
         if (!uuid_is_null (args->loc->inode->gfid))
@@ -4644,6 +4799,7 @@ client3_3_getxattr (call_frame_t *frame, xlator_t *this,
         }
 
         loc_copy (&local->loc, args->loc);
+        loc_path (&local->loc, NULL);
         if (args->name)
                 local->name = gf_strdup (args->name);
 
@@ -4808,6 +4964,8 @@ client3_3_xattrop (call_frame_t *frame, xlator_t *this,
         else
                 memcpy (req.gfid, args->loc->gfid, 16);
 
+        loc_copy (&local->loc, args->loc);
+        loc_path (&local->loc, NULL);
         GF_ASSERT_AND_GOTO_WITH_ERROR (this->name,
                                        !uuid_is_null (*((uuid_t*)req.gfid)),
                                        unwind, op_errno, EINVAL);
@@ -5794,7 +5952,140 @@ unwind:
         return 0;
 }
 
+int32_t
+client3_3_fallocate(call_frame_t *frame, xlator_t *this, void *data)
+{
+        clnt_args_t       *args     = NULL;
+        int64_t            remote_fd = -1;
+        clnt_conf_t       *conf     = NULL;
+	gfs3_fallocate_req req	    = {{0},};
+        int                op_errno = ESTALE;
+        int                ret        = 0;
+
+        if (!frame || !this || !data)
+                goto unwind;
+
+        args = data;
+        conf = this->private;
+
+        CLIENT_GET_REMOTE_FD (this, args->fd, DEFAULT_REMOTE_FD,
+                              remote_fd, op_errno, unwind);
+
+        req.fd = remote_fd;
+	req.flags = args->flags;
+	req.offset = args->offset;
+	req.size = args->size;
+	memcpy(req.gfid, args->fd->inode->gfid, 16);
 
+        GF_PROTOCOL_DICT_SERIALIZE (this, args->xdata, (&req.xdata.xdata_val),
+                                    req.xdata.xdata_len, op_errno, unwind);
+
+        ret = client_submit_request (this, &req, frame, conf->fops,
+                                     GFS3_OP_FALLOCATE,
+                                     client3_3_fallocate_cbk, NULL,
+                                     NULL, 0, NULL, 0,
+                                     NULL, (xdrproc_t)xdr_gfs3_fallocate_req);
+        if (ret) {
+                gf_log (this->name, GF_LOG_WARNING, "failed to send the fop");
+        }
+
+        GF_FREE (req.xdata.xdata_val);
+
+        return 0;
+unwind:
+        CLIENT_STACK_UNWIND (fallocate, frame, -1, op_errno, NULL, NULL, NULL);
+        GF_FREE (req.xdata.xdata_val);
+
+        return 0;
+}
+
+int32_t
+client3_3_discard(call_frame_t *frame, xlator_t *this, void *data)
+{
+        clnt_args_t       *args     = NULL;
+        int64_t            remote_fd = -1;
+        clnt_conf_t       *conf     = NULL;
+	gfs3_discard_req   req	    = {{0},};
+        int                op_errno = ESTALE;
+        int                ret        = 0;
+
+        if (!frame || !this || !data)
+                goto unwind;
+
+        args = data;
+        conf = this->private;
+
+        CLIENT_GET_REMOTE_FD (this, args->fd, DEFAULT_REMOTE_FD,
+                              remote_fd, op_errno, unwind);
+
+        req.fd = remote_fd;
+	req.offset = args->offset;
+	req.size = args->size;
+	memcpy(req.gfid, args->fd->inode->gfid, 16);
+
+        GF_PROTOCOL_DICT_SERIALIZE (this, args->xdata, (&req.xdata.xdata_val),
+                                    req.xdata.xdata_len, op_errno, unwind);
+
+        ret = client_submit_request(this, &req, frame, conf->fops,
+                                    GFS3_OP_DISCARD, client3_3_discard_cbk,
+				    NULL, NULL, 0, NULL, 0, NULL,
+                                    (xdrproc_t) xdr_gfs3_discard_req);
+        if (ret)
+                gf_log (this->name, GF_LOG_WARNING, "failed to send the fop");
+
+        GF_FREE (req.xdata.xdata_val);
+
+        return 0;
+unwind:
+        CLIENT_STACK_UNWIND(discard, frame, -1, op_errno, NULL, NULL, NULL);
+        GF_FREE (req.xdata.xdata_val);
+
+        return 0;
+}
+
+int32_t
+client3_3_zerofill(call_frame_t *frame, xlator_t *this, void *data)
+{
+        clnt_args_t       *args        = NULL;
+        int64_t            remote_fd   = -1;
+        clnt_conf_t       *conf        = NULL;
+        gfs3_zerofill_req   req        = {{0},};
+        int                op_errno    = ESTALE;
+        int                ret         = 0;
+
+        if (!frame || !this || !data)
+                goto unwind;
+
+        args = data;
+        conf = this->private;
+
+        CLIENT_GET_REMOTE_FD (this, args->fd, DEFAULT_REMOTE_FD,
+                              remote_fd, op_errno, unwind);
+
+        req.fd = remote_fd;
+        req.offset = args->offset;
+        req.size = args->size;
+        memcpy(req.gfid, args->fd->inode->gfid, 16);
+
+        GF_PROTOCOL_DICT_SERIALIZE (this, args->xdata, (&req.xdata.xdata_val),
+                                    req.xdata.xdata_len, op_errno, unwind);
+
+        ret = client_submit_request(this, &req, frame, conf->fops,
+                                    GFS3_OP_ZEROFILL, client3_3_zerofill_cbk,
+                                    NULL, NULL, 0, NULL, 0, NULL,
+                                    (xdrproc_t) xdr_gfs3_zerofill_req);
+        if (ret)
+                gf_log (this->name, GF_LOG_WARNING, "failed to send the fop");
+
+        GF_FREE (req.xdata.xdata_val);
+
+        return 0;
+unwind:
+        CLIENT_STACK_UNWIND(zerofill, frame, -1, op_errno, NULL, NULL, NULL);
+        GF_FREE (req.xdata.xdata_val);
+
+        return 0;
+}
 
 /* Table Specific to FOPS */
 
@@ -5841,6 +6132,9 @@ rpc_clnt_procedure_t clnt3_3_fop_actors[GF_FOP_MAXVALUE] = {
         [GF_FOP_SETATTR]     = { "SETATTR",     client3_3_setattr },
         [GF_FOP_FSETATTR]    = { "FSETATTR",    client3_3_fsetattr },
         [GF_FOP_READDIRP]    = { "READDIRP",    client3_3_readdirp },
+	[GF_FOP_FALLOCATE]   = { "FALLOCATE",	client3_3_fallocate },
+	[GF_FOP_DISCARD]     = { "DISCARD",	client3_3_discard },
+        [GF_FOP_ZEROFILL]    = { "ZEROFILL",    client3_3_zerofill},
         [GF_FOP_RELEASE]     = { "RELEASE",     client3_3_release },
         [GF_FOP_RELEASEDIR]  = { "RELEASEDIR",  client3_3_releasedir },
         [GF_FOP_GETSPEC]     = { "GETSPEC",     client3_getspec },
@@ -5893,6 +6187,10 @@ char *clnt3_3_fop_names[GFS3_OP_MAXVALUE] = {
         [GFS3_OP_RELEASE]     = "RELEASE",
         [GFS3_OP_RELEASEDIR]  = "RELEASEDIR",
         [GFS3_OP_FREMOVEXATTR] = "FREMOVEXATTR",
+	[GFS3_OP_FALLOCATE]   = "FALLOCATE",
+	[GFS3_OP_DISCARD]     = "DISCARD",
+        [GFS3_OP_ZEROFILL]    = "ZEROFILL",
+
 };
 
 rpc_clnt_prog_t clnt3_3_fop_prog = {
diff --git a/xlators/protocol/client/src/client.c b/xlators/protocol/client/src/client.c
index 931c67156..1f7d13ea4 100644
--- a/xlators/protocol/client/src/client.c
+++ b/xlators/protocol/client/src/client.c
@@ -130,7 +130,7 @@ client_register_grace_timer (xlator_t *this, clnt_conf_t *conf)
 
                         conf->grace_timer =
                                 gf_timer_call_after (this->ctx,
-                                                     conf->grace_tv,
+                                                     conf->grace_ts,
                                                      client_grace_timeout,
                                                      conf->rpc);
                 }
@@ -1961,6 +1961,110 @@ out:
 	return 0;
 }
 
+int32_t
+client_fallocate(call_frame_t *frame, xlator_t *this, fd_t *fd, int32_t mode,
+		 off_t offset, size_t len, dict_t *xdata)
+{
+        int          ret  = -1;
+        clnt_conf_t *conf = NULL;
+        rpc_clnt_procedure_t *proc = NULL;
+        clnt_args_t  args = {0,};
+
+        conf = this->private;
+        if (!conf || !conf->fops)
+                goto out;
+
+        args.fd = fd;
+	args.flags = mode;
+	args.offset = offset;
+	args.size = len;
+        args.xdata = xdata;
+
+        proc = &conf->fops->proctable[GF_FOP_FALLOCATE];
+        if (!proc) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "rpc procedure not found for %s",
+                        gf_fop_list[GF_FOP_FALLOCATE]);
+                goto out;
+        }
+        if (proc->fn)
+                ret = proc->fn (frame, this, &args);
+out:
+        if (ret)
+                STACK_UNWIND_STRICT (fallocate, frame, -1, ENOTCONN, NULL, NULL, NULL);
+
+	return 0;
+}
+
+int32_t
+client_discard(call_frame_t *frame, xlator_t *this, fd_t *fd, off_t offset,
+	       size_t len, dict_t *xdata)
+{
+        int          ret  = -1;
+        clnt_conf_t *conf = NULL;
+        rpc_clnt_procedure_t *proc = NULL;
+        clnt_args_t  args = {0,};
+
+        conf = this->private;
+        if (!conf || !conf->fops)
+                goto out;
+
+        args.fd = fd;
+	args.offset = offset;
+	args.size = len;
+        args.xdata = xdata;
+
+        proc = &conf->fops->proctable[GF_FOP_DISCARD];
+        if (!proc) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "rpc procedure not found for %s",
+                        gf_fop_list[GF_FOP_DISCARD]);
+                goto out;
+        }
+        if (proc->fn)
+                ret = proc->fn (frame, this, &args);
+out:
+        if (ret)
+                STACK_UNWIND_STRICT(discard, frame, -1, ENOTCONN, NULL, NULL, NULL);
+
+	return 0;
+}
+
+int32_t
+client_zerofill(call_frame_t *frame, xlator_t *this, fd_t *fd, off_t offset,
+               size_t len, dict_t *xdata)
+{
+        int          ret              = -1;
+        clnt_conf_t *conf             = NULL;
+        rpc_clnt_procedure_t *proc    = NULL;
+        clnt_args_t  args             = {0,};
+
+        conf = this->private;
+        if (!conf || !conf->fops)
+                goto out;
+
+        args.fd = fd;
+        args.offset = offset;
+        args.size = len;
+        args.xdata = xdata;
+
+        proc = &conf->fops->proctable[GF_FOP_ZEROFILL];
+        if (!proc) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "rpc procedure not found for %s",
+                        gf_fop_list[GF_FOP_ZEROFILL]);
+                goto out;
+        }
+        if (proc->fn)
+                ret = proc->fn (frame, this, &args);
+out:
+        if (ret)
+                STACK_UNWIND_STRICT(zerofill, frame, -1, ENOTCONN,
+                                    NULL, NULL, NULL);
+
+        return 0;
+}
+
 
 int32_t
 client_getspec (call_frame_t *frame, xlator_t *this, const char *key,
@@ -2050,7 +2154,7 @@ client_rpc_notify (struct rpc_clnt *rpc, void *mydata, rpc_clnt_event_t event,
                 gf_log (this->name, GF_LOG_DEBUG, "got RPC_CLNT_CONNECT");
 
                 if ((ret < 0) || (strcasecmp (handshake, "on"))) {
-                        ret = client_handshake (this, conf->rpc);
+                        ret = client_handshake (this, rpc);
                         if (ret)
                                 gf_log (this->name, GF_LOG_WARNING,
                                         "handshake msg returned %d", ret);
@@ -2092,9 +2196,19 @@ client_rpc_notify (struct rpc_clnt *rpc, void *mydata, rpc_clnt_event_t event,
                         client_register_grace_timer (this, conf);
 
                 if (!conf->skip_notify) {
-                        if (conf->connected)
-                                gf_log (this->name, GF_LOG_INFO,
-                                        "disconnected");
+                        if (conf->connected) {
+                               gf_log (this->name,
+                                        ((!conf->disconnect_err_logged)
+                                        ? GF_LOG_INFO : GF_LOG_DEBUG),
+                                        "disconnected from %s. Client process "
+                                        "will keep trying to connect to "
+                                        "glusterd until brick's port is "
+                                        "available",
+                                  conf->rpc->conn.trans->peerinfo.identifier);
+
+                                if (conf->portmap_err_logged)
+                                        conf->disconnect_err_logged = 1;
+                        }
 
                         /* If the CHILD_DOWN event goes to parent xlator
                            multiple times, the logic of parent xlator notify
@@ -2118,10 +2232,14 @@ client_rpc_notify (struct rpc_clnt *rpc, void *mydata, rpc_clnt_event_t event,
                 conf->connected = 0;
                 conf->skip_notify = 0;
 
-		if (conf->quick_reconnect) {
-			conf->quick_reconnect = 0;
-			rpc_clnt_start (conf->rpc);
-		}
+                if (conf->quick_reconnect) {
+                        conf->quick_reconnect = 0;
+                        rpc_clnt_start (rpc);
+
+                } else {
+                        rpc->conn.config.remote_port = 0;
+
+                }
 
                 break;
 
@@ -2332,14 +2450,14 @@ client_init_grace_timer (xlator_t *this, dict_t *options,
 
         ret = dict_get_int32 (options, "grace-timeout", &grace_timeout);
         if (!ret)
-                conf->grace_tv.tv_sec = grace_timeout;
+                conf->grace_ts.tv_sec = grace_timeout;
         else
-                conf->grace_tv.tv_sec = 10;
+                conf->grace_ts.tv_sec = 10;
 
-        conf->grace_tv.tv_usec  = 0;
+        conf->grace_ts.tv_nsec  = 0;
 
         gf_log (this->name, GF_LOG_DEBUG, "Client grace timeout "
-                "value = %"PRIu64, conf->grace_tv.tv_sec);
+                "value = %"PRIu64, conf->grace_ts.tv_sec);
 
         ret = 0;
 out:
@@ -2665,6 +2783,9 @@ struct xlator_fops fops = {
         .fxattrop    = client_fxattrop,
         .setattr     = client_setattr,
         .fsetattr    = client_fsetattr,
+	.fallocate   = client_fallocate,
+	.discard     = client_discard,
+        .zerofill    = client_zerofill,
         .getspec     = client_getspec,
 };
 
diff --git a/xlators/protocol/client/src/client.h b/xlators/protocol/client/src/client.h
index 0a27c095c..afab2d74f 100644
--- a/xlators/protocol/client/src/client.h
+++ b/xlators/protocol/client/src/client.h
@@ -93,6 +93,10 @@ typedef struct clnt_conf {
                                                    which was sent earlier */
         char                   portmap_err_logged; /* flag used to prevent
                                                       excessive logging */
+        char                   disconnect_err_logged; /* flag used to prevent
+                                                         excessive disconnect
+                                                         logging */
+
         char                   need_different_port; /* flag used to change the
                                                        portmap path in case of
                                                        'tcp,rdma' on server */
@@ -100,7 +104,7 @@ typedef struct clnt_conf {
         uint16_t               lk_version; /* this variable is used to distinguish
                                               client-server transaction while
                                               performing lock healing */
-        struct timeval         grace_tv;
+        struct timespec        grace_ts;
         gf_timer_t            *grace_timer;
         gf_boolean_t           grace_timer_needed; /* The state of this flag will
                                                       be used to decide whether
diff --git a/xlators/protocol/server/src/Makefile.am b/xlators/protocol/server/src/Makefile.am
index 25d6706cc..6a18bf025 100644
--- a/xlators/protocol/server/src/Makefile.am
+++ b/xlators/protocol/server/src/Makefile.am
@@ -16,9 +16,9 @@ AM_CPPFLAGS = $(GF_CPPFLAGS) \
 	-I$(top_srcdir)/libglusterfs/src \
 	-DCONFDIR=\"$(sysconfdir)/glusterfs\" \
 	-DLIBDIR=\"$(libdir)/glusterfs/$(PACKAGE_VERSION)/auth\" \
-	-I$(top_srcdir)/xlators/protocol/lib/src   \
-	-I$(top_srcdir)/rpc/rpc-lib/src/       \
-	-I$(top_srcdir)/rpc/xdr/src/
+	-I$(top_srcdir)/xlators/protocol/lib/src \
+	-I$(top_srcdir)/rpc/rpc-lib/src \
+	-I$(top_srcdir)/rpc/xdr/src
 
 AM_CFLAGS = -Wall $(GF_CFLAGS) \
             -DDATADIR=\"$(localstatedir)\"
diff --git a/xlators/protocol/server/src/authenticate.c b/xlators/protocol/server/src/authenticate.c
index eb6deb801..d8d138a84 100644
--- a/xlators/protocol/server/src/authenticate.c
+++ b/xlators/protocol/server/src/authenticate.c
@@ -1,21 +1,14 @@
 /*
-  Copyright (c) 2007-2011 Gluster, Inc. <http://www.gluster.com>
+  Copyright (c) 2007-2013 Red Hat, Inc. <http://www.redhat.com>
   This file is part of GlusterFS.
 
-  GlusterFS is free software; you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published
-  by the Free Software Foundation; either version 3 of the License,
-  or (at your option) any later version.
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
+*/
 
-  GlusterFS is distributed in the hope that it will be useful, but
-  WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-  General Public License for more details.
 
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see
-  <http://www.gnu.org/licenses/>.
-*/
 
 #ifndef _CONFIG_H
 #define _CONFIG_H
diff --git a/xlators/protocol/server/src/authenticate.h b/xlators/protocol/server/src/authenticate.h
index bb9f77e45..d4d43e498 100644
--- a/xlators/protocol/server/src/authenticate.h
+++ b/xlators/protocol/server/src/authenticate.h
@@ -1,20 +1,11 @@
 /*
-  Copyright (c) 2007-2011 Gluster, Inc. <http://www.gluster.com>
+  Copyright (c) 2007-2013 Red Hat, Inc. <http://www.redhat.com>
   This file is part of GlusterFS.
 
-  GlusterFS is free software; you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published
-  by the Free Software Foundation; either version 3 of the License,
-  or (at your option) any later version.
-
-  GlusterFS is distributed in the hope that it will be useful, but
-  WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-  General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see
-  <http://www.gnu.org/licenses/>.
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
 */
 
 #ifndef _AUTHENTICATE_H
diff --git a/xlators/protocol/server/src/server-handshake.c b/xlators/protocol/server/src/server-handshake.c
index 330f32be7..d4941011d 100644
--- a/xlators/protocol/server/src/server-handshake.c
+++ b/xlators/protocol/server/src/server-handshake.c
@@ -1,20 +1,11 @@
 /*
-  Copyright (c) 2010-2011 Gluster, Inc. <http://www.gluster.com>
+  Copyright (c) 2010-2013 Red Hat, Inc. <http://www.redhat.com>
   This file is part of GlusterFS.
 
-  GlusterFS is free software; you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published
-  by the Free Software Foundation; either version 3 of the License,
-  or (at your option) any later version.
-
-  GlusterFS is distributed in the hope that it will be useful, but
-  WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-  General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see
-  <http://www.gnu.org/licenses/>.
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
 */
 
 
@@ -103,9 +94,9 @@ _volfile_update_checksum (xlator_t *this, char *key, uint32_t checksum)
 
         if (temp_volfile->checksum != checksum) {
                 gf_log (this->name, GF_LOG_INFO,
-                        "the volume file got modified between earlier access "
-                        "and now, this may lead to inconsistency between "
-                        "clients, advised to remount client");
+                        "the volume file was modified between a prior access "
+                        "and now. This may lead to inconsistency between "
+                        "clients, you are advised to remount client");
                 temp_volfile->checksum  = checksum;
         }
 
@@ -118,10 +109,10 @@ static size_t
 getspec_build_volfile_path (xlator_t *this, const char *key, char *path,
                             size_t path_len)
 {
-        int              ret = -1;
+        char            *filename      = NULL;
+        server_conf_t   *conf          = NULL;
+        int              ret           = -1;
         int              free_filename = 0;
-        char            *filename = NULL;
-        server_conf_t   *conf = NULL;
         char             data_key[256] = {0,};
 
         conf = this->private;
@@ -338,14 +329,15 @@ server_setvolume (rpcsvc_request_t *req)
 {
         gf_setvolume_req     args          = {{0,},};
         gf_setvolume_rsp     rsp           = {0,};
-        server_connection_t *conn          = NULL;
+        client_t            *client        = NULL;
+        server_ctx_t        *serv_ctx      = NULL;
         server_conf_t       *conf          = NULL;
         peer_info_t         *peerinfo      = NULL;
         dict_t              *reply         = NULL;
         dict_t              *config_params = NULL;
         dict_t              *params        = NULL;
         char                *name          = NULL;
-        char                *process_uuid  = NULL;
+        char                *client_uid    = NULL;
         char                *clnt_version  = NULL;
         xlator_t            *xl            = NULL;
         char                *msg           = NULL;
@@ -402,7 +394,7 @@ server_setvolume (rpcsvc_request_t *req)
         params->extra_free = buf;
         buf = NULL;
 
-        ret = dict_get_str (params, "process-uuid", &process_uuid);
+        ret = dict_get_str (params, "process-uuid", &client_uid);
         if (ret < 0) {
                 ret = dict_set_str (reply, "ERROR",
                                     "UUID not specified");
@@ -429,25 +421,32 @@ server_setvolume (rpcsvc_request_t *req)
                 goto fail;
         }
 
-        conn = server_connection_get (this, process_uuid);
-        if (!conn) {
+        client = gf_client_get (this, &req->cred, client_uid);
+        if (client == NULL) {
                 op_ret = -1;
                 op_errno = ENOMEM;
                 goto fail;
         }
 
-        gf_log (this->name, GF_LOG_DEBUG, "Connected to %s", conn->id);
-        cancelled = server_cancel_conn_timer (this, conn);
-        if (cancelled)//Do connection_put on behalf of grace-timer-handler.
-                server_connection_put (this, conn, NULL);
-        if (conn->lk_version != 0 &&
-            conn->lk_version != lk_version) {
-                (void) server_connection_cleanup (this, conn,
+        gf_log (this->name, GF_LOG_DEBUG, "Connected to %s", client->client_uid);
+        cancelled = server_cancel_grace_timer (this, client);
+        if (cancelled)//Do gf_client_put on behalf of grace-timer-handler.
+                gf_client_put (client, NULL);
+
+        serv_ctx = server_ctx_get (client, client->this);
+        if (serv_ctx == NULL) {
+                gf_log (this->name, GF_LOG_INFO, "server_ctx_get() failed");
+                goto fail;
+        }
+
+        if (serv_ctx->lk_version != 0 &&
+            serv_ctx->lk_version != lk_version) {
+                (void) server_connection_cleanup (this, client,
                                                   INTERNAL_LOCKS | POSIX_LOCKS);
         }
 
-        if (req->trans->xl_private != conn)
-                req->trans->xl_private = conn;
+        if (req->trans->xl_private != client)
+                req->trans->xl_private = client;
 
         ret = dict_get_int32 (params, "fops-version", &fop_version);
         if (ret < 0) {
@@ -572,10 +571,10 @@ server_setvolume (rpcsvc_request_t *req)
 
                 gf_log (this->name, GF_LOG_INFO,
                         "accepted client from %s (version: %s)",
-                        conn->id,
+                        client->client_uid,
                         (clnt_version) ? clnt_version : "old");
                 op_ret = 0;
-                conn->bound_xl = xl;
+                client->bound_xl = xl;
                 ret = dict_set_str (reply, "ERROR", "Success");
                 if (ret < 0)
                         gf_log (this->name, GF_LOG_DEBUG,
@@ -583,7 +582,7 @@ server_setvolume (rpcsvc_request_t *req)
         } else {
                 gf_log (this->name, GF_LOG_ERROR,
                         "Cannot authenticate client from %s %s",
-                        conn->id,
+                        client->client_uid,
                         (clnt_version) ? clnt_version : "old");
 
                 op_ret = -1;
@@ -595,7 +594,7 @@ server_setvolume (rpcsvc_request_t *req)
                 goto fail;
         }
 
-        if (conn->bound_xl == NULL) {
+        if (client->bound_xl == NULL) {
                 ret = dict_set_str (reply, "ERROR",
                                     "Check volfile and handshake "
                                     "options in protocol/client");
@@ -608,20 +607,21 @@ server_setvolume (rpcsvc_request_t *req)
                 goto fail;
         }
 
-        if ((conn->bound_xl != NULL) &&
+        if ((client->bound_xl != NULL) &&
             (ret >= 0)                   &&
-            (conn->bound_xl->itable == NULL)) {
+            (client->bound_xl->itable == NULL)) {
                 /* create inode table for this bound_xl, if one doesn't
                    already exist */
 
                 gf_log (this->name, GF_LOG_TRACE,
                         "creating inode table with lru_limit=%"PRId32", "
                         "xlator=%s", conf->inode_lru_limit,
-                        conn->bound_xl->name);
+                        client->bound_xl->name);
 
                 /* TODO: what is this ? */
-                conn->bound_xl->itable = inode_table_new (conf->inode_lru_limit,
-                                                          conn->bound_xl);
+                client->bound_xl->itable =
+                        inode_table_new (conf->inode_lru_limit,
+                                         client->bound_xl);
         }
 
         ret = dict_set_str (reply, "process-uuid",
@@ -630,8 +630,7 @@ server_setvolume (rpcsvc_request_t *req)
                 gf_log (this->name, GF_LOG_DEBUG,
                         "failed to set 'process-uuid'");
 
-        ret = dict_set_uint32 (reply, "clnt-lk-version",
-                               conn->lk_version);
+        ret = dict_set_uint32 (reply, "clnt-lk-version", serv_ctx->lk_version);
         if (ret)
                 gf_log (this->name, GF_LOG_WARNING,
                         "failed to set 'clnt-lk-version'");
@@ -673,15 +672,15 @@ fail:
          * list of connections the server is maintaining and might segfault
          * during statedump when bound_xl of the connection is accessed.
          */
-        if (op_ret && conn && !xl) {
+        if (op_ret && !xl) {
                 /* We would have set the xl_private of the transport to the
                  * @conn. But if we have put the connection i.e shutting down
                  * the connection, then we should set xl_private to NULL as it
                  * would be pointing to a freed memory and would segfault when
                  * accessed upon getting DISCONNECT.
                  */
-                if (server_connection_put (this, conn, NULL) == NULL)
-                        req->trans->xl_private = NULL;
+                gf_client_put (client, NULL);
+                req->trans->xl_private = NULL;
         }
         server_submit_reply (NULL, req, &rsp, NULL, 0, NULL,
                              (xdrproc_t)xdr_gf_setvolume_rsp);
@@ -718,12 +717,13 @@ server_ping (rpcsvc_request_t *req)
 int
 server_set_lk_version (rpcsvc_request_t *req)
 {
-        int                     op_ret          = -1;
-        int                     op_errno        = EINVAL;
-        gf_set_lk_ver_req       args            = {0, };
-        gf_set_lk_ver_rsp       rsp             = {0,};
-        server_connection_t     *conn           = NULL;
-        xlator_t                *this           = NULL;
+        int                 op_ret   = -1;
+        int                 op_errno = EINVAL;
+        gf_set_lk_ver_req   args     = {0,};
+        gf_set_lk_ver_rsp   rsp      = {0,};
+        client_t           *client   = NULL;
+        server_ctx_t       *serv_ctx = NULL;
+        xlator_t           *this     = NULL;
 
         this = req->svc->mydata;
         //TODO: Decide on an appropriate errno for the error-path
@@ -739,9 +739,15 @@ server_set_lk_version (rpcsvc_request_t *req)
                 goto fail;
         }
 
-        conn = server_connection_get (this, args.uid);
-        conn->lk_version = args.lk_ver;
-        server_connection_put (this, conn, NULL);
+        client = gf_client_get (this, &req->cred, args.uid);
+        serv_ctx = server_ctx_get (client, client->this);
+        if (serv_ctx == NULL) {
+                gf_log (this->name, GF_LOG_INFO, "server_ctx_get() failed");
+                goto fail;
+        }
+
+        serv_ctx->lk_version = args.lk_ver;
+        gf_client_put (client, NULL);
 
         rsp.lk_ver   = args.lk_ver;
 
@@ -758,11 +764,11 @@ fail:
 }
 
 rpcsvc_actor_t gluster_handshake_actors[] = {
-        [GF_HNDSK_NULL]       = {"NULL",      GF_HNDSK_NULL,      server_null, NULL, 0},
-        [GF_HNDSK_SETVOLUME]  = {"SETVOLUME", GF_HNDSK_SETVOLUME, server_setvolume, NULL, 0},
-        [GF_HNDSK_GETSPEC]    = {"GETSPEC",   GF_HNDSK_GETSPEC,   server_getspec, NULL, 0},
-        [GF_HNDSK_PING]       = {"PING",      GF_HNDSK_PING,      server_ping, NULL, 0},
-        [GF_HNDSK_SET_LK_VER] = {"SET_LK_VER", GF_HNDSK_SET_LK_VER, server_set_lk_version, NULL, 0},
+        [GF_HNDSK_NULL]       = {"NULL",       GF_HNDSK_NULL,       server_null,           NULL, 0, DRC_NA},
+        [GF_HNDSK_SETVOLUME]  = {"SETVOLUME",  GF_HNDSK_SETVOLUME,  server_setvolume,      NULL, 0, DRC_NA},
+        [GF_HNDSK_GETSPEC]    = {"GETSPEC",    GF_HNDSK_GETSPEC,    server_getspec,        NULL, 0, DRC_NA},
+        [GF_HNDSK_PING]       = {"PING",       GF_HNDSK_PING,       server_ping,           NULL, 0, DRC_NA},
+        [GF_HNDSK_SET_LK_VER] = {"SET_LK_VER", GF_HNDSK_SET_LK_VER, server_set_lk_version, NULL, 0, DRC_NA},
 };
 
 
diff --git a/xlators/protocol/server/src/server-helpers.c b/xlators/protocol/server/src/server-helpers.c
index 28b912eec..f0b040c74 100644
--- a/xlators/protocol/server/src/server-helpers.c
+++ b/xlators/protocol/server/src/server-helpers.c
@@ -1,20 +1,11 @@
 /*
-  Copyright (c) 2010-2011 Gluster, Inc. <http://www.gluster.com>
+  Copyright (c) 2010-2013 Red Hat, Inc. <http://www.redhat.com>
   This file is part of GlusterFS.
 
-  GlusterFS is free software; you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published
-  by the Free Software Foundation; either version 3 of the License,
-  or (at your option) any later version.
-
-  GlusterFS is distributed in the hope that it will be useful, but
-  WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-  General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see
-  <http://www.gnu.org/licenses/>.
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
 */
 
 #ifndef _CONFIG_H
@@ -35,6 +26,9 @@ server_decode_groups (call_frame_t *frame, rpcsvc_request_t *req)
         GF_VALIDATE_OR_GOTO ("server", frame, out);
         GF_VALIDATE_OR_GOTO ("server", req, out);
 
+        if (call_stack_alloc_groups (frame->root, req->auxgidcount) != 0)
+                return -1;
+
         frame->root->ngrps = req->auxgidcount;
         if (frame->root->ngrps == 0)
                 return 0;
@@ -48,6 +42,7 @@ out:
         return 0;
 }
 
+
 void
 server_loc_wipe (loc_t *loc)
 {
@@ -79,11 +74,6 @@ server_resolve_wipe (server_resolve_t *resolve)
 void
 free_state (server_state_t *state)
 {
-        if (state->conn) {
-                //xprt_svc_unref (state->conn);
-                state->conn = NULL;
-        }
-
         if (state->xprt) {
                 rpc_transport_unref (state->xprt);
                 state->xprt = NULL;
@@ -132,301 +122,26 @@ free_state (server_state_t *state)
 }
 
 
-int
-gf_add_locker (server_connection_t *conn, const char *volume,
-               loc_t *loc, fd_t *fd, pid_t pid, gf_lkowner_t *owner,
-               glusterfs_fop_t type)
-{
-        int32_t         ret = -1;
-        struct _locker *new = NULL;
-        struct _lock_table *table = NULL;
-
-        GF_VALIDATE_OR_GOTO ("server", volume, out);
-
-        new = GF_CALLOC (1, sizeof (struct _locker), gf_server_mt_locker_t);
-        if (new == NULL) {
-                goto out;
-        }
-        INIT_LIST_HEAD (&new->lockers);
-
-        new->volume = gf_strdup (volume);
-
-        if (fd == NULL) {
-                loc_copy (&new->loc, loc);
-        } else {
-                new->fd = fd_ref (fd);
-        }
-
-        new->pid   = pid;
-        new->owner = *owner;
-
-        pthread_mutex_lock (&conn->lock);
-        {
-                table = conn->ltable;
-                if (type == GF_FOP_ENTRYLK)
-                        list_add_tail (&new->lockers, &table->entrylk_lockers);
-                else
-                        list_add_tail (&new->lockers, &table->inodelk_lockers);
-        }
-        pthread_mutex_unlock (&conn->lock);
-out:
-        return ret;
-}
-
-
-int
-gf_del_locker (server_connection_t *conn, const char *volume,
-               loc_t *loc, fd_t *fd, gf_lkowner_t *owner,
-               glusterfs_fop_t type)
-{
-        struct _locker    *locker = NULL;
-        struct _locker    *tmp = NULL;
-        int32_t            ret = -1;
-        struct list_head  *head = NULL;
-        struct _lock_table *table = NULL;
-        int                found = 0;
-
-        GF_VALIDATE_OR_GOTO ("server", volume, out);
-
-        pthread_mutex_lock (&conn->lock);
-        {
-                table = conn->ltable;
-                if (type == GF_FOP_ENTRYLK) {
-                        head = &table->entrylk_lockers;
-                } else {
-                        head = &table->inodelk_lockers;
-                }
-
-                list_for_each_entry_safe (locker, tmp, head, lockers) {
-                        if (!is_same_lkowner (&locker->owner, owner) ||
-                            strcmp (locker->volume, volume))
-                                continue;
-
-                        if (locker->fd && fd && (locker->fd == fd))
-                                found = 1;
-                        else if (locker->loc.inode && loc &&
-                                 (locker->loc.inode == loc->inode))
-                                found = 1;
-                        if (found) {
-                                list_del_init (&locker->lockers);
-                                break;
-                        }
-                }
-                if (!found)
-                        locker = NULL;
-        }
-        pthread_mutex_unlock (&conn->lock);
-
-        if (locker) {
-                if (locker->fd)
-                        fd_unref (locker->fd);
-                else
-                        loc_wipe (&locker->loc);
-
-                GF_FREE (locker->volume);
-                GF_FREE (locker);
-        }
-
-        ret = 0;
-out:
-        return ret;
-}
-
-static struct _lock_table *
-gf_lock_table_new (void)
-{
-        struct _lock_table *new = NULL;
-
-        new = GF_CALLOC (1, sizeof (struct _lock_table), gf_server_mt_lock_table_t);
-        if (new == NULL) {
-                goto out;
-        }
-        INIT_LIST_HEAD (&new->entrylk_lockers);
-        INIT_LIST_HEAD (&new->inodelk_lockers);
-out:
-        return new;
-}
-
-static int
-server_nop_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
-                int32_t op_ret, int32_t op_errno, dict_t *xdata)
-{
-        int             ret   = -1;
-        server_state_t *state = NULL;
-
-        GF_VALIDATE_OR_GOTO ("server", frame, out);
-        GF_VALIDATE_OR_GOTO ("server", cookie, out);
-        GF_VALIDATE_OR_GOTO ("server", this, out);
-
-        if (frame->root->trans)
-                server_conn_unref (frame->root->trans);
-        state = CALL_STATE(frame);
-
-        if (state)
-                free_state (state);
-        STACK_DESTROY (frame->root);
-
-        ret = 0;
-out:
-        return ret;
-}
-
-int
-do_lock_table_cleanup (xlator_t *this, server_connection_t *conn,
-                       call_frame_t *frame, struct _lock_table *ltable)
-{
-        struct list_head  inodelk_lockers, entrylk_lockers;
-        call_frame_t     *tmp_frame = NULL;
-        struct gf_flock      flock = {0, };
-        xlator_t         *bound_xl = NULL;
-        struct _locker   *locker = NULL, *tmp = NULL;
-        int               ret = -1;
-        char             *path = NULL;
-
-        GF_VALIDATE_OR_GOTO ("server", this, out);
-        GF_VALIDATE_OR_GOTO ("server", conn, out);
-        GF_VALIDATE_OR_GOTO ("server", frame, out);
-        GF_VALIDATE_OR_GOTO ("server", ltable, out);
-
-        bound_xl = conn->bound_xl;
-        INIT_LIST_HEAD (&inodelk_lockers);
-        INIT_LIST_HEAD (&entrylk_lockers);
-
-        list_splice_init (&ltable->inodelk_lockers,
-                          &inodelk_lockers);
-
-        list_splice_init (&ltable->entrylk_lockers, &entrylk_lockers);
-        GF_FREE (ltable);
-
-        flock.l_type  = F_UNLCK;
-        flock.l_start = 0;
-        flock.l_len   = 0;
-        list_for_each_entry_safe (locker,
-                                  tmp, &inodelk_lockers, lockers) {
-                tmp_frame = copy_frame (frame);
-                if (tmp_frame == NULL) {
-                        goto out;
-                }
-                /*
-                  lock owner = 0 is a special case that tells posix-locks
-                  to release all locks from this transport
-                */
-                tmp_frame->root->pid         = 0;
-                tmp_frame->root->trans       = server_conn_ref (conn);
-                memset (&tmp_frame->root->lk_owner, 0, sizeof (gf_lkowner_t));
-
-                if (locker->fd) {
-                        GF_ASSERT (locker->fd->inode);
-
-                        ret = inode_path (locker->fd->inode, NULL, &path);
-
-                        if (ret > 0) {
-                                gf_log (this->name, GF_LOG_INFO, "finodelk "
-                                        "released on %s", path);
-                                GF_FREE (path);
-                        } else {
-
-                                gf_log (this->name, GF_LOG_INFO, "finodelk "
-                                        "released on inode with gfid %s",
-                                        uuid_utoa (locker->fd->inode->gfid));
-                        }
-
-                        STACK_WIND (tmp_frame, server_nop_cbk, bound_xl,
-                                    bound_xl->fops->finodelk,
-                                    locker->volume,
-                                    locker->fd, F_SETLK, &flock, NULL);
-                        fd_unref (locker->fd);
-                } else {
-                        gf_log (this->name, GF_LOG_INFO, "inodelk released "
-                                "on %s", locker->loc.path);
-
-                        STACK_WIND (tmp_frame, server_nop_cbk, bound_xl,
-                                    bound_xl->fops->inodelk,
-                                    locker->volume,
-                                    &(locker->loc), F_SETLK, &flock, NULL);
-                        loc_wipe (&locker->loc);
-                }
-
-                GF_FREE (locker->volume);
-
-                list_del_init (&locker->lockers);
-                GF_FREE (locker);
-        }
-
-        tmp = NULL;
-        locker = NULL;
-        list_for_each_entry_safe (locker, tmp, &entrylk_lockers, lockers) {
-                tmp_frame = copy_frame (frame);
-
-                tmp_frame->root->pid         = 0;
-                tmp_frame->root->trans       = server_conn_ref (conn);
-                memset (&tmp_frame->root->lk_owner, 0, sizeof (gf_lkowner_t));
-
-                if (locker->fd) {
-                        GF_ASSERT (locker->fd->inode);
-
-                        ret = inode_path (locker->fd->inode, NULL, &path);
-
-                        if (ret > 0) {
-                                gf_log (this->name, GF_LOG_INFO, "fentrylk "
-                                        "released on %s", path);
-                                GF_FREE (path);
-                        }  else {
-
-                                gf_log (this->name, GF_LOG_INFO, "fentrylk "
-                                        "released on inode with gfid %s",
-                                        uuid_utoa (locker->fd->inode->gfid));
-                        }
-
-                        STACK_WIND (tmp_frame, server_nop_cbk, bound_xl,
-                                    bound_xl->fops->fentrylk,
-                                    locker->volume,
-                                    locker->fd, NULL,
-                                    ENTRYLK_UNLOCK, ENTRYLK_WRLCK, NULL);
-                        fd_unref (locker->fd);
-                } else {
-                        gf_log (this->name, GF_LOG_INFO, "entrylk released "
-                                "on %s", locker->loc.path);
-
-                        STACK_WIND (tmp_frame, server_nop_cbk, bound_xl,
-                                    bound_xl->fops->entrylk,
-                                    locker->volume,
-                                    &(locker->loc), NULL,
-                                    ENTRYLK_UNLOCK, ENTRYLK_WRLCK, NULL);
-                        loc_wipe (&locker->loc);
-                }
-
-                GF_FREE (locker->volume);
-
-                list_del_init (&locker->lockers);
-                GF_FREE (locker);
-        }
-        ret = 0;
-
-out:
-        return ret;
-}
-
-
 static int
 server_connection_cleanup_flush_cbk (call_frame_t *frame, void *cookie,
                                      xlator_t *this, int32_t op_ret,
                                      int32_t op_errno, dict_t *xdata)
 {
-        int32_t ret = -1;
-        fd_t *fd = NULL;
+        int32_t    ret    = -1;
+        fd_t      *fd     = NULL;
+        client_t  *client = NULL;
 
         GF_VALIDATE_OR_GOTO ("server", this, out);
         GF_VALIDATE_OR_GOTO ("server", cookie, out);
         GF_VALIDATE_OR_GOTO ("server", frame, out);
 
         fd = frame->local;
+        client = frame->root->client;
 
         fd_unref (fd);
         frame->local = NULL;
 
-        if (frame->root->trans)
-                server_conn_unref (frame->root->trans);
+        gf_client_unref (client);
         STACK_DESTROY (frame->root);
 
         ret = 0;
@@ -435,9 +150,8 @@ out:
 }
 
 
-int
-do_fd_cleanup (xlator_t *this, server_connection_t *conn, call_frame_t *frame,
-               fdentry_t *fdentries, int fd_count)
+static int
+do_fd_cleanup (xlator_t *this, client_t* client, fdentry_t *fdentries, int fd_count)
 {
         fd_t               *fd = NULL;
         int                 i = 0, ret = -1;
@@ -446,16 +160,14 @@ do_fd_cleanup (xlator_t *this, server_connection_t *conn, call_frame_t *frame,
         char               *path     = NULL;
 
         GF_VALIDATE_OR_GOTO ("server", this, out);
-        GF_VALIDATE_OR_GOTO ("server", conn, out);
-        GF_VALIDATE_OR_GOTO ("server", frame, out);
         GF_VALIDATE_OR_GOTO ("server", fdentries, out);
 
-        bound_xl = conn->bound_xl;
+        bound_xl = client->bound_xl;
         for (i = 0;i < fd_count; i++) {
                 fd = fdentries[i].fd;
 
                 if (fd != NULL) {
-                        tmp_frame = copy_frame (frame);
+                        tmp_frame = create_frame (this, this->ctx->pool);
                         if (tmp_frame == NULL) {
                                 goto out;
                         }
@@ -465,20 +177,20 @@ do_fd_cleanup (xlator_t *this, server_connection_t *conn, call_frame_t *frame,
                         ret = inode_path (fd->inode, NULL, &path);
 
                         if (ret > 0) {
-                                gf_log (this->name, GF_LOG_INFO, "fd cleanup on "
-                                        "%s", path);
+                                gf_log (this->name, GF_LOG_INFO,
+                                        "fd cleanup on %s", path);
                                 GF_FREE (path);
                         }  else {
 
-                                gf_log (this->name, GF_LOG_INFO, "fd cleanup on"
-                                        " inode with gfid %s",
+                                gf_log (this->name, GF_LOG_INFO,
+                                        "fd cleanup on inode with gfid %s",
                                         uuid_utoa (fd->inode->gfid));
                         }
 
                         tmp_frame->local = fd;
 
                         tmp_frame->root->pid = 0;
-                        tmp_frame->root->trans = server_conn_ref (conn);
+                        gf_client_ref (client);
                         memset (&tmp_frame->root->lk_owner, 0,
                                 sizeof (gf_lkowner_t));
 
@@ -495,268 +207,72 @@ out:
         return ret;
 }
 
-int
-do_connection_cleanup (xlator_t *this, server_connection_t *conn,
-                       struct _lock_table *ltable, fdentry_t *fdentries, int fd_count)
-{
-        int             ret = 0;
-        int             saved_ret = 0;
-        call_frame_t   *frame = NULL;
-        server_state_t *state = NULL;
-
-        GF_VALIDATE_OR_GOTO ("server", this, out);
-        GF_VALIDATE_OR_GOTO ("server", conn, out);
-
-        if (!ltable && !fdentries)
-                goto out;
-
-        frame = create_frame (this, this->ctx->pool);
-        if (frame == NULL) {
-                goto out;
-        }
-
-        if (ltable)
-                saved_ret = do_lock_table_cleanup (this, conn, frame, ltable);
-
-        if (fdentries != NULL) {
-                ret = do_fd_cleanup (this, conn, frame, fdentries, fd_count);
-        }
-
-        state = CALL_STATE (frame);
-        GF_FREE (state);
-
-        STACK_DESTROY (frame->root);
-
-        if (saved_ret || ret) {
-                ret = -1;
-        }
-
-out:
-        return ret;
-}
-
 
 int
-server_connection_cleanup (xlator_t *this, server_connection_t *conn,
+server_connection_cleanup (xlator_t *this, client_t *client,
                            int32_t flags)
 {
-        struct _lock_table *ltable = NULL;
-        fdentry_t          *fdentries = NULL;
-        uint32_t            fd_count = 0;
-        int                 ret = 0;
+        server_ctx_t        *serv_ctx  = NULL;
+        fdentry_t           *fdentries = NULL;
+        uint32_t             fd_count  = 0;
+        int                  cd_ret    = 0;
+        int                  ret       = 0;
 
         GF_VALIDATE_OR_GOTO (this->name, this, out);
-        GF_VALIDATE_OR_GOTO (this->name, conn, out);
+        GF_VALIDATE_OR_GOTO (this->name, client, out);
         GF_VALIDATE_OR_GOTO (this->name, flags, out);
 
-        pthread_mutex_lock (&conn->lock);
-        {
-                if (conn->ltable && (flags & INTERNAL_LOCKS)) {
-                        ltable = conn->ltable;
-                        conn->ltable = gf_lock_table_new ();
-                }
-
-                if (conn->fdtable && (flags & POSIX_LOCKS))
-                        fdentries = gf_fd_fdtable_get_all_fds (conn->fdtable,
-                                                               &fd_count);
-        }
-        pthread_mutex_unlock (&conn->lock);
-
-        if (conn->bound_xl)
-                ret = do_connection_cleanup (this, conn, ltable,
-                                             fdentries, fd_count);
-
-out:
-        return ret;
-}
+        serv_ctx = server_ctx_get (client, client->this);
 
-
-int
-server_connection_destroy (xlator_t *this, server_connection_t *conn)
-{
-        xlator_t           *bound_xl = NULL;
-        int32_t             ret = -1;
-        struct list_head    inodelk_lockers;
-        struct list_head    entrylk_lockers;
-        struct _lock_table *ltable = NULL;
-        fdtable_t          *fdtable = NULL;
-
-        GF_VALIDATE_OR_GOTO ("server", this, out);
-        GF_VALIDATE_OR_GOTO ("server", conn, out);
-
-        bound_xl = (xlator_t *) (conn->bound_xl);
-
-        if (bound_xl) {
-                pthread_mutex_lock (&(conn->lock));
-                {
-                        if (conn->ltable) {
-                                ltable = conn->ltable;
-                                conn->ltable = NULL;
-                        }
-                        if (conn->fdtable) {
-                                fdtable = conn->fdtable;
-                                conn->fdtable = NULL;
-                        }
-                }
-                pthread_mutex_unlock (&conn->lock);
-
-                INIT_LIST_HEAD (&inodelk_lockers);
-                INIT_LIST_HEAD (&entrylk_lockers);
-
-                if (ltable) {
-                        list_splice_init (&ltable->inodelk_lockers,
-                                          &inodelk_lockers);
-
-                        list_splice_init (&ltable->entrylk_lockers,
-                                          &entrylk_lockers);
-                        GF_FREE (ltable);
-                }
-
-                GF_ASSERT (list_empty (&inodelk_lockers));
-                GF_ASSERT (list_empty (&entrylk_lockers));
-
-                if (fdtable)
-                        gf_fd_fdtable_destroy (fdtable);
+        if (serv_ctx == NULL) {
+                gf_log (this->name, GF_LOG_INFO, "server_ctx_get() failed");
+                goto out;
         }
 
-        gf_log (this->name, GF_LOG_INFO, "destroyed connection of %s",
-                conn->id);
-
-        pthread_mutex_destroy (&conn->lock);
-        GF_FREE (conn->id);
-        GF_FREE (conn);
-        ret = 0;
-out:
-        return ret;
-}
-
-server_connection_t*
-server_conn_unref (server_connection_t *conn)
-{
-        server_connection_t *todel = NULL;
-        xlator_t            *this = NULL;
-
-        pthread_mutex_lock (&conn->lock);
+        LOCK (&serv_ctx->fdtable_lock);
         {
-                conn->ref--;
-
-                if (!conn->ref) {
-                        todel = conn;
-                }
+                if (serv_ctx->fdtable && (flags & POSIX_LOCKS))
+                        fdentries = gf_fd_fdtable_get_all_fds (serv_ctx->fdtable,
+                                                               &fd_count);
         }
-        pthread_mutex_unlock (&conn->lock);
+        UNLOCK (&serv_ctx->fdtable_lock);
 
-        if (todel) {
-                this = THIS;
-                server_connection_destroy (this, todel);
-                conn = NULL;
-        }
-        return conn;
-}
+        if (client->bound_xl == NULL)
+                goto out;
 
-server_connection_t*
-server_conn_ref (server_connection_t *conn)
-{
-        pthread_mutex_lock (&conn->lock);
-        {
-                conn->ref++;
+        if (flags & INTERNAL_LOCKS) {
+                cd_ret = gf_client_disconnect (client);
         }
-        pthread_mutex_unlock (&conn->lock);
-
-        return conn;
-}
 
-server_connection_t *
-server_connection_get (xlator_t *this, const char *id)
-{
-        server_connection_t *conn = NULL;
-        server_connection_t *trav = NULL;
-        server_conf_t       *conf = NULL;
+        if (fdentries != NULL)
+                ret = do_fd_cleanup (this, client, fdentries, fd_count);
+        else
+                gf_log (this->name, GF_LOG_INFO, "no fdentries to clean");
 
-        GF_VALIDATE_OR_GOTO ("server", this, out);
-        GF_VALIDATE_OR_GOTO ("server", id, out);
-
-        conf = this->private;
-
-        pthread_mutex_lock (&conf->mutex);
-        {
-                list_for_each_entry (trav, &conf->conns, list) {
-                        if (!strcmp (trav->id, id)) {
-                                conn = trav;
-                                conn->bind_ref++;
-                                goto unlock;
-                        }
-                }
-
-                conn = (void *) GF_CALLOC (1, sizeof (*conn),
-                                           gf_server_mt_conn_t);
-                if (!conn)
-                        goto unlock;
-
-                conn->id = gf_strdup (id);
-                /*'0' denotes uninitialised lock state*/
-                conn->lk_version = 0;
-                conn->fdtable = gf_fd_fdtable_alloc ();
-                conn->ltable  = gf_lock_table_new ();
-                conn->this    = this;
-                conn->bind_ref = 1;
-                conn->ref     = 1;//when bind_ref becomes 0 it calls conn_unref
-                pthread_mutex_init (&conn->lock, NULL);
-                list_add (&conn->list, &conf->conns);
+        if (cd_ret || ret)
+                ret = -1;
 
-        }
-unlock:
-        pthread_mutex_unlock (&conf->mutex);
 out:
-        return conn;
+        return ret;
 }
 
-server_connection_t*
-server_connection_put (xlator_t *this, server_connection_t *conn,
-                       gf_boolean_t *detached)
-{
-        server_conf_t       *conf = NULL;
-        gf_boolean_t        unref = _gf_false;
-
-        if (detached)
-                *detached = _gf_false;
-        conf = this->private;
-        pthread_mutex_lock (&conf->mutex);
-        {
-                conn->bind_ref--;
-                if (!conn->bind_ref) {
-                        list_del_init (&conn->list);
-                        unref = _gf_true;
-                }
-        }
-        pthread_mutex_unlock (&conf->mutex);
-        if (unref) {
-                gf_log (this->name, GF_LOG_INFO, "Shutting down connection %s",
-                        conn->id);
-                if (detached)
-                        *detached = _gf_true;
-                server_conn_unref (conn);
-                conn = NULL;
-        }
-        return conn;
-}
 
 static call_frame_t *
 server_alloc_frame (rpcsvc_request_t *req)
 {
-        call_frame_t         *frame = NULL;
-        server_state_t       *state = NULL;
-        server_connection_t  *conn  = NULL;
+        call_frame_t    *frame  = NULL;
+        server_state_t  *state  = NULL;
+        client_t        *client = NULL;
 
         GF_VALIDATE_OR_GOTO ("server", req, out);
         GF_VALIDATE_OR_GOTO ("server", req->trans, out);
         GF_VALIDATE_OR_GOTO ("server", req->svc, out);
         GF_VALIDATE_OR_GOTO ("server", req->svc->ctx, out);
 
-        conn = (server_connection_t *)req->trans->xl_private;
-        GF_VALIDATE_OR_GOTO ("server", conn, out);
+        client = req->trans->xl_private;
+        GF_VALIDATE_OR_GOTO ("server", client, out);
 
-        frame = create_frame (conn->this, req->svc->ctx->pool);
+        frame = create_frame (client->this, req->svc->ctx->pool);
         if (!frame)
                 goto out;
 
@@ -764,45 +280,46 @@ server_alloc_frame (rpcsvc_request_t *req)
         if (!state)
                 goto out;
 
-        if (conn->bound_xl)
-                state->itable = conn->bound_xl->itable;
+        if (client->bound_xl)
+                state->itable = client->bound_xl->itable;
 
         state->xprt  = rpc_transport_ref (req->trans);
-        state->conn  = conn;
-
         state->resolve.fd_no = -1;
         state->resolve2.fd_no = -1;
 
+        frame->root->client  = client;
         frame->root->state = state;        /* which socket */
         frame->root->unique = 0;           /* which call */
 
-        frame->this = conn->this;
+        frame->this = client->this;
 out:
         return frame;
 }
 
 
-
 call_frame_t *
 get_frame_from_request (rpcsvc_request_t *req)
 {
-        call_frame_t *frame = NULL;
+        call_frame_t  *frame = NULL;
+        client_t      *client = NULL;
 
         GF_VALIDATE_OR_GOTO ("server", req, out);
 
+        client = req->trans->xl_private;
+
         frame = server_alloc_frame (req);
         if (!frame)
                 goto out;
 
         frame->root->op       = req->procnum;
-        frame->root->type     = req->type;
 
         frame->root->unique   = req->xid;
 
         frame->root->uid      = req->uid;
         frame->root->gid      = req->gid;
         frame->root->pid      = req->pid;
-        frame->root->trans    = server_conn_ref (req->trans->xl_private);
+        gf_client_ref (client);
+        frame->root->client   = client;
         frame->root->lk_owner = req->lk_owner;
 
         server_decode_groups (frame, req);
@@ -887,84 +404,6 @@ out:
         return ret;
 }
 
-void
-put_server_conn_state (xlator_t *this, rpc_transport_t *xprt)
-{
-        GF_VALIDATE_OR_GOTO ("server", this, out);
-        GF_VALIDATE_OR_GOTO ("server", xprt, out);
-
-        xprt->xl_private = NULL;
-out:
-        return;
-}
-
-server_connection_t *
-get_server_conn_state (xlator_t *this, rpc_transport_t *xprt)
-{
-        GF_VALIDATE_OR_GOTO ("server", this, out);
-        GF_VALIDATE_OR_GOTO ("server", xprt, out);
-
-        return (server_connection_t *)xprt->xl_private;
-out:
-        return NULL;
-}
-
-server_connection_t *
-create_server_conn_state (xlator_t *this, rpc_transport_t *xprt)
-{
-        server_connection_t *conn = NULL;
-        int                  ret = -1;
-
-        GF_VALIDATE_OR_GOTO ("server", this, out);
-        GF_VALIDATE_OR_GOTO ("server", xprt, out);
-
-        conn = GF_CALLOC (1, sizeof (*conn), gf_server_mt_conn_t);
-        if (!conn)
-                goto out;
-
-        pthread_mutex_init (&conn->lock, NULL);
-
-        conn->fdtable = gf_fd_fdtable_alloc ();
-        if (!conn->fdtable)
-                goto out;
-
-        conn->ltable  = gf_lock_table_new ();
-        if (!conn->ltable)
-                goto out;
-
-        conn->this = this;
-
-        xprt->xl_private = conn;
-
-        ret = 0;
-out:
-        if (ret)
-                destroy_server_conn_state (conn);
-
-        return conn;
-}
-
-void
-destroy_server_conn_state (server_connection_t *conn)
-{
-        GF_VALIDATE_OR_GOTO ("server", conn, out);
-
-        if (conn->ltable) {
-                /* TODO */
-                //FREE (conn->ltable);
-                ;
-        }
-
-        if (conn->fdtable)
-                gf_fd_fdtable_destroy (conn->fdtable);
-
-        pthread_mutex_destroy (&conn->lock);
-
-        GF_FREE (conn);
-out:
-        return;
-}
-
 
 void
 print_caller (char *str, int size, call_frame_t *frame)
@@ -1091,12 +530,15 @@ server_print_params (char *str, int size, server_state_t *state)
                 filled += snprintf (str + filled, size - filled,
                                     "volume=%s,", state->volume);
 
+/* FIXME
         snprintf (str + filled, size - filled,
-                  "bound_xl=%s}", state->conn->bound_xl->name);
+                  "bound_xl=%s}", state->client->bound_xl->name);
+*/
 out:
         return;
 }
 
+
 int
 server_resolve_is_empty (server_resolve_t *resolve)
 {
@@ -1112,6 +554,7 @@ server_resolve_is_empty (server_resolve_t *resolve)
         return 1;
 }
 
+
 void
 server_print_reply (call_frame_t *frame, int op_ret, int op_errno)
 {
@@ -1157,16 +600,16 @@ out:
 void
 server_print_request (call_frame_t *frame)
 {
-        server_conf_t   *conf = NULL;
-        xlator_t        *this = NULL;
+        server_conf_t   *conf  = NULL;
+        xlator_t        *this  = NULL;
         server_state_t  *state = NULL;
+        char            *op    = "UNKNOWN";
         char             resolve_vars[256];
         char             resolve2_vars[256];
         char             loc_vars[256];
         char             loc2_vars[256];
         char             other_vars[512];
         char             caller[512];
-        char            *op = "UNKNOWN";
 
         GF_VALIDATE_OR_GOTO ("server", frame, out);
 
@@ -1217,13 +660,14 @@ out:
         return;
 }
 
+
 int
 serialize_rsp_direntp (gf_dirent_t *entries, gfs3_readdirp_rsp *rsp)
 {
         gf_dirent_t         *entry = NULL;
-        gfs3_dirplist       *trav = NULL;
-        gfs3_dirplist       *prev = NULL;
-        int                  ret = -1;
+        gfs3_dirplist       *trav  = NULL;
+        gfs3_dirplist       *prev  = NULL;
+        int                  ret   = -1;
 
         GF_VALIDATE_OR_GOTO ("server", entries, out);
         GF_VALIDATE_OR_GOTO ("server", rsp, out);
@@ -1291,10 +735,10 @@ out:
 int
 serialize_rsp_dirent (gf_dirent_t *entries, gfs3_readdir_rsp *rsp)
 {
-        gf_dirent_t         *entry = NULL;
-        gfs3_dirlist        *trav = NULL;
-        gfs3_dirlist        *prev = NULL;
-        int                  ret = -1;
+        gf_dirent_t   *entry = NULL;
+        gfs3_dirlist  *trav  = NULL;
+        gfs3_dirlist  *prev  = NULL;
+        int           ret    = -1;
 
         GF_VALIDATE_OR_GOTO ("server", entries, out);
         GF_VALIDATE_OR_GOTO ("server", rsp, out);
@@ -1321,11 +765,12 @@ out:
         return ret;
 }
 
+
 int
 readdir_rsp_cleanup (gfs3_readdir_rsp *rsp)
 {
-        gfs3_dirlist *prev = NULL;
-        gfs3_dirlist *trav = NULL;
+        gfs3_dirlist  *prev = NULL;
+        gfs3_dirlist  *trav = NULL;
 
         trav = rsp->reply;
         prev = trav;
@@ -1338,6 +783,7 @@ readdir_rsp_cleanup (gfs3_readdir_rsp *rsp)
         return 0;
 }
 
+
 int
 readdirp_rsp_cleanup (gfs3_readdirp_rsp *rsp)
 {
@@ -1356,6 +802,7 @@ readdirp_rsp_cleanup (gfs3_readdirp_rsp *rsp)
         return 0;
 }
 
+
 int
 gf_server_check_getxattr_cmd (call_frame_t *frame, const char *key)
 {
@@ -1384,13 +831,14 @@ gf_server_check_getxattr_cmd (call_frame_t *frame, const char *key)
         return 0;
 }
 
+
 int
 gf_server_check_setxattr_cmd (call_frame_t *frame, dict_t *dict)
 {
 
-        server_conf_t    *conf = NULL;
-        rpc_transport_t  *xprt = NULL;
-        uint64_t          total_read = 0;
+        server_conf_t    *conf        = NULL;
+        rpc_transport_t  *xprt        = NULL;
+        uint64_t          total_read  = 0;
         uint64_t          total_write = 0;
 
         conf = frame->this->private;
@@ -1411,32 +859,403 @@ gf_server_check_setxattr_cmd (call_frame_t *frame, dict_t *dict)
         return 0;
 }
 
+
 gf_boolean_t
-server_cancel_conn_timer (xlator_t *this, server_connection_t *conn)
+server_cancel_grace_timer (xlator_t *this, client_t *client)
 {
-        gf_timer_t      *timer = NULL;
-        gf_boolean_t    cancelled = _gf_false;
+        server_ctx_t  *serv_ctx  = NULL;
+        gf_timer_t    *timer     = NULL;
+        gf_boolean_t   cancelled = _gf_false;
 
-        if (!this || !conn) {
-                gf_log (THIS->name, GF_LOG_ERROR, "Invalid arguments to "
-                        "cancel connection timer");
+        if (!this || !client) {
+                gf_log (THIS->name, GF_LOG_ERROR,
+                        "Invalid arguments to cancel connection timer");
                 return cancelled;
         }
 
-        pthread_mutex_lock (&conn->lock);
-        {
-                if (!conn->timer)
-                        goto unlock;
+        serv_ctx = server_ctx_get (client, client->this);
 
-                timer = conn->timer;
-                conn->timer = NULL;
+        if (serv_ctx == NULL) {
+                gf_log (this->name, GF_LOG_INFO, "server_ctx_get() failed");
+                goto out;
         }
-unlock:
-        pthread_mutex_unlock (&conn->lock);
+
+        LOCK (&serv_ctx->fdtable_lock);
+        {
+                if (serv_ctx->grace_timer) {
+                        timer = serv_ctx->grace_timer;
+                        serv_ctx->grace_timer = NULL;
+                }
+        }
+        UNLOCK (&serv_ctx->fdtable_lock);
 
         if (timer) {
                 gf_timer_call_cancel (this->ctx, timer);
                 cancelled = _gf_true;
         }
+out:
         return cancelled;
 }
+
+server_ctx_t*
+server_ctx_get (client_t *client, xlator_t *xlator)
+{
+        void *tmp = NULL;
+        server_ctx_t *ctx = NULL;
+
+        client_ctx_get (client, xlator, &tmp);
+
+        ctx = tmp;
+
+        if (ctx != NULL)
+                goto out;
+
+        ctx = GF_CALLOC (1, sizeof (server_ctx_t), gf_server_mt_server_conf_t);
+
+        if (ctx == NULL)
+                goto out;
+
+     /* ctx->lk_version = 0; redundant */
+        ctx->fdtable = gf_fd_fdtable_alloc ();
+
+        if (ctx->fdtable == NULL) {
+                GF_FREE (ctx);
+                ctx = NULL;
+                goto out;
+        }
+
+        LOCK_INIT (&ctx->fdtable_lock);
+
+        if (client_ctx_set (client, xlator, ctx) != 0) {
+              LOCK_DESTROY (&ctx->fdtable_lock);
+              GF_FREE (ctx);
+              ctx = NULL;
+        }
+
+out:
+        return ctx;
+}
+
+int32_t
+gf_barrier_transmit (server_conf_t *conf, gf_barrier_payload_t *payload)
+{
+        gf_barrier_t            *barrier = NULL;
+        int32_t                  ret     = -1;
+        client_t                *client  = NULL;
+        gf_boolean_t             lk_heal = _gf_false;
+        call_frame_t            *frame   = NULL;
+        server_state_t          *state   = NULL;
+
+        GF_VALIDATE_OR_GOTO ("barrier", conf, out);
+        GF_VALIDATE_OR_GOTO ("barrier", conf->barrier, out);
+        GF_VALIDATE_OR_GOTO ("barrier", payload, out);
+
+        barrier = conf->barrier;
+
+        frame = payload->frame;
+        if (frame) {
+                state = CALL_STATE (frame);
+                frame->local = NULL;
+                client = frame->root->client;
+        }
+        /* currently lk fops are not barrier'ed. This is reflecting code in
+         * server_submit_reply */
+        if (client)
+                lk_heal = ((server_conf_t *) client->this->private)->lk_heal;
+
+        ret = rpcsvc_submit_generic (payload->req, &payload->rsp, 1,
+                                     payload->payload, payload->payload_count,
+                                     payload->iobref);
+        iobuf_unref (payload->iob);
+        if (ret == -1) {
+                gf_log_callingfn ("", GF_LOG_ERROR, "Reply submission failed");
+                if (frame && client && !lk_heal) {
+                        server_connection_cleanup (frame->this, client,
+                                                  INTERNAL_LOCKS | POSIX_LOCKS);
+                } else {
+                        /* TODO: Failure of open(dir), create, inodelk, entrylk
+                           or lk fops send failure must be handled specially. */
+                }
+                goto ret;
+        }
+
+        ret = 0;
+ret:
+        if (state) {
+                free_state (state);
+        }
+
+        if (frame) {
+                gf_client_unref (client);
+                STACK_DESTROY (frame->root);
+        }
+
+        if (payload->free_iobref) {
+                iobref_unref (payload->iobref);
+        }
+out:
+        return ret;
+}
+
+gf_barrier_payload_t *
+gf_barrier_dequeue (gf_barrier_t *barrier)
+{
+        gf_barrier_payload_t  *payload = NULL;
+
+        if (!barrier || list_empty (&barrier->queue))
+                return NULL;
+
+        payload = list_entry (barrier->queue.next,
+                              gf_barrier_payload_t, list);
+        if (payload) {
+                list_del_init (&payload->list);
+                barrier->cur_size--;
+        }
+
+        return payload;
+}
+
+
+void*
+gf_barrier_dequeue_start (void *data)
+{
+        server_conf_t           *conf = NULL;
+        gf_barrier_t            *barrier = NULL;
+        gf_barrier_payload_t    *payload = NULL;
+
+        conf = (server_conf_t *)data;
+        if (!conf || !conf->barrier)
+                return NULL;
+        barrier = conf->barrier;
+
+        LOCK (&barrier->lock);
+        {
+                while (barrier->cur_size) {
+                        payload = gf_barrier_dequeue (barrier);
+                        if (payload) {
+                                if (gf_barrier_transmit (conf, payload)) {
+                                        gf_log ("server", GF_LOG_WARNING,
+                                                "Failed to transmit");
+                                }
+                                GF_FREE (payload);
+                        }
+                }
+        }
+        UNLOCK (&barrier->lock);
+        return NULL;
+}
+
+void
+gf_barrier_timeout (void *data)
+{
+        server_conf_t *conf = NULL;
+        gf_barrier_t  *barrier = NULL;
+        gf_boolean_t   need_dequeue = _gf_false;
+
+        conf = (server_conf_t *)data;
+        if (!conf || !conf->barrier)
+                goto out;
+        barrier = conf->barrier;
+
+        gf_log ("", GF_LOG_INFO, "barrier timed-out");
+        LOCK (&barrier->lock);
+        {
+                need_dequeue = barrier->on;
+                barrier->on = _gf_false;
+        }
+        UNLOCK (&barrier->lock);
+
+        if (need_dequeue == _gf_true)
+                gf_barrier_dequeue_start (data);
+out:
+        return;
+}
+
+
+int32_t
+gf_barrier_start (xlator_t *this)
+{
+        server_conf_t *conf = NULL;
+        gf_barrier_t  *barrier = NULL;
+        int32_t        ret  = -1;
+        struct timespec time = {0,};
+
+        conf = this->private;
+
+        GF_VALIDATE_OR_GOTO ("server", this, out);
+        GF_VALIDATE_OR_GOTO (this->name, conf, out);
+        GF_VALIDATE_OR_GOTO (this->name, conf->barrier, out);
+
+        barrier = conf->barrier;
+
+        gf_log (this->name, GF_LOG_INFO, "barrier start called");
+        LOCK (&barrier->lock);
+        {
+                /* if barrier is on, reset timer */
+                if (barrier->on == _gf_true) {
+                        ret = gf_timer_call_cancel (this->ctx, barrier->timer);
+                        if (ret) {
+                                gf_log (this->name, GF_LOG_ERROR, "Failed to "
+                                        "unset timer, failing barrier start");
+                                goto unlock;
+                        }
+                }
+
+                barrier->on = _gf_true;
+                time.tv_sec = barrier->time_out;
+                time.tv_nsec = 0;
+
+                barrier->timer = gf_timer_call_after (this->ctx, time,
+                                                      gf_barrier_timeout,
+                                                      (void *)conf);
+                if (!barrier->timer) {
+                        gf_log (this->name, GF_LOG_ERROR, "Failed to set "
+                                "timer, failing barrier start");
+                        barrier->on = _gf_false;
+                }
+        }
+unlock:
+        UNLOCK (&barrier->lock);
+
+        ret = 0;
+out:
+        return ret;
+}
+
+int32_t
+gf_barrier_stop (xlator_t *this)
+{
+        server_conf_t *conf = NULL;
+        gf_barrier_t  *barrier = NULL;
+        int32_t        ret  = -1;
+        gf_boolean_t   need_dequeue = _gf_false;
+
+        conf = this->private;
+
+        GF_VALIDATE_OR_GOTO ("server", this, out);
+        GF_VALIDATE_OR_GOTO (this->name, conf, out);
+        GF_VALIDATE_OR_GOTO (this->name, conf->barrier, out);
+
+        barrier = conf->barrier;
+
+        gf_log (this->name, GF_LOG_INFO, "barrier stop called");
+        LOCK (&barrier->lock);
+        {
+                need_dequeue = barrier->on;
+                barrier->on = _gf_false;
+        }
+        UNLOCK (&barrier->lock);
+
+        if (need_dequeue == _gf_true) {
+                gf_timer_call_cancel (this->ctx, barrier->timer);
+                ret = gf_thread_create (&conf->barrier_th, NULL,
+                                        gf_barrier_dequeue_start,
+                                        conf);
+                if (ret) {
+                        gf_log (this->name, GF_LOG_CRITICAL,
+                                "Failed to start un-barriering");
+                        goto out;
+                }
+        }
+        ret = 0;
+out:
+        return ret;
+}
+
+int32_t
+gf_barrier_fops_configure (xlator_t *this, gf_barrier_t *barrier, char *str)
+{
+        int32_t         ret = -1;
+        char           *dup_str = NULL;
+        char           *str_tok = NULL;
+        char           *save_ptr = NULL;
+        uint64_t        fops = 0;
+
+        /* by defaul fsync & flush needs to be barriered */
+
+        fops |= 1 << GFS3_OP_FSYNC;
+        fops |= 1 << GFS3_OP_FLUSH;
+
+        if (!str)
+                goto done;
+
+        dup_str = gf_strdup (str);
+        if (!dup_str)
+                goto done;
+
+        str_tok = strtok_r (dup_str, ",", &save_ptr);
+        if (!str_tok)
+                goto done;
+
+        fops = 0;
+        while (str_tok) {
+                if (!strcmp(str_tok, "writev")) {
+                        fops |= ((uint64_t)1 << GFS3_OP_WRITE);
+                } else if (!strcmp(str_tok, "fsync")) {
+                        fops |= ((uint64_t)1 << GFS3_OP_FSYNC);
+                } else if (!strcmp(str_tok, "read")) {
+                        fops |= ((uint64_t)1 << GFS3_OP_READ);
+                } else if (!strcmp(str_tok, "rename")) {
+                        fops |= ((uint64_t)1 << GFS3_OP_RENAME);
+                } else if (!strcmp(str_tok, "flush")) {
+                        fops |= ((uint64_t)1 << GFS3_OP_FLUSH);
+                } else if (!strcmp(str_tok, "ftruncate")) {
+                        fops |= ((uint64_t)1 << GFS3_OP_FTRUNCATE);
+                } else if (!strcmp(str_tok, "fallocate")) {
+                        fops |= ((uint64_t)1 << GFS3_OP_FALLOCATE);
+                } else if (!strcmp(str_tok, "rmdir")) {
+                        fops |= ((uint64_t)1 << GFS3_OP_RMDIR);
+                }  else {
+                        gf_log ("barrier", GF_LOG_ERROR,
+                                "Invalid barrier fop %s", str_tok);
+                }
+
+                str_tok = strtok_r (NULL, ",", &save_ptr);
+        }
+done:
+        LOCK (&barrier->lock);
+        {
+                barrier->fops = fops;
+        }
+        UNLOCK (&barrier->lock);
+        ret = 0;
+
+        GF_FREE (dup_str);
+        return ret;
+}
+
+void
+gf_barrier_enqueue (gf_barrier_t *barrier, gf_barrier_payload_t *payload)
+{
+        list_add_tail (&payload->list, &barrier->queue);
+        barrier->cur_size++;
+}
+
+gf_barrier_payload_t *
+gf_barrier_payload (rpcsvc_request_t *req, struct iovec *rsp,
+                    call_frame_t *frame, struct iovec *payload_orig,
+                    int payloadcount, struct iobref *iobref,
+                    struct iobuf *iob, gf_boolean_t free_iobref)
+{
+        gf_barrier_payload_t *payload = NULL;
+
+        if (!rsp)
+                return NULL;
+
+        payload = GF_CALLOC (1, sizeof (*payload),1);
+        if (!payload)
+                return NULL;
+
+        INIT_LIST_HEAD (&payload->list);
+
+        payload->req = req;
+        memcpy (&payload->rsp, rsp, sizeof (struct iovec));
+        payload->frame = frame;
+        payload->payload = payload_orig;
+        payload->payload_count = payloadcount;
+        payload->iobref = iobref;
+        payload->iob = iob;
+        payload->free_iobref = free_iobref;
+
+        return payload;
+}
diff --git a/xlators/protocol/server/src/server-helpers.h b/xlators/protocol/server/src/server-helpers.h
index 5ce5e36ac..b455aa6df 100644
--- a/xlators/protocol/server/src/server-helpers.h
+++ b/xlators/protocol/server/src/server-helpers.h
@@ -1,20 +1,11 @@
 /*
-  Copyright (c) 2010-2011 Gluster, Inc. <http://www.gluster.com>
+  Copyright (c) 2010-2013 Red Hat, Inc. <http://www.redhat.com>
   This file is part of GlusterFS.
 
-  GlusterFS is free software; you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published
-  by the Free Software Foundation; either version 3 of the License,
-  or (at your option) any later version.
-
-  GlusterFS is distributed in the hope that it will be useful, but
-  WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-  General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see
-  <http://www.gnu.org/licenses/>.
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
 */
 
 #ifndef _SERVER_HELPERS_H
@@ -24,13 +15,8 @@
 
 #define CALL_STATE(frame)   ((server_state_t *)frame->root->state)
 
-#define BOUND_XL(frame)     ((xlator_t *) CALL_STATE(frame)->conn->bound_xl)
-
 #define XPRT_FROM_FRAME(frame) ((rpc_transport_t *) CALL_STATE(frame)->xprt)
 
-#define SERVER_CONNECTION(frame)                                \
-        ((server_connection_t *) CALL_STATE(frame)->conn)
-
 #define SERVER_CONF(frame)                                              \
         ((server_conf_t *)XPRT_FROM_FRAME(frame)->this->private)
 
@@ -43,45 +29,26 @@
 
 #define IS_NOT_ROOT(pathlen) ((pathlen > 2)? 1 : 0)
 
+#define is_fop_barriered(fops, procnum) (fops & ((uint64_t)1 << procnum))
+
+#define barrier_add_to_queue(barrier) (barrier->on || barrier->cur_size)
+
 void free_state (server_state_t *state);
 
 void server_loc_wipe (loc_t *loc);
 
-int32_t
-gf_add_locker (server_connection_t *conn, const char *volume,
-               loc_t *loc,
-               fd_t *fd,
-               pid_t pid,
-               gf_lkowner_t *owner,
-               glusterfs_fop_t type);
-
-int32_t
-gf_del_locker (server_connection_t *conn, const char *volume,
-               loc_t *loc,
-               fd_t *fd,
-               gf_lkowner_t *owner,
-               glusterfs_fop_t type);
-
 void
 server_print_request (call_frame_t *frame);
 
 call_frame_t *
 get_frame_from_request (rpcsvc_request_t *req);
 
-gf_boolean_t
-server_cancel_conn_timer (xlator_t *this, server_connection_t *conn);
-
-void
-put_server_conn_state (xlator_t *this, rpc_transport_t *xprt);
-
-server_connection_t *
-get_server_conn_state (xlator_t *this, rpc_transport_t *xptr);
-
-server_connection_t *
-create_server_conn_state (xlator_t *this, rpc_transport_t *xptr);
+int
+server_connection_cleanup (xlator_t *this, struct _client_t *client,
+                           int32_t flags);
 
-void
-destroy_server_conn_state (server_connection_t *conn);
+gf_boolean_t
+server_cancel_grace_timer (xlator_t *this, struct _client_t *client);
 
 int
 server_build_config (xlator_t *this, server_conf_t *conf);
@@ -91,4 +58,17 @@ int serialize_rsp_direntp (gf_dirent_t *entries, gfs3_readdirp_rsp *rsp);
 int readdirp_rsp_cleanup (gfs3_readdirp_rsp *rsp);
 int readdir_rsp_cleanup (gfs3_readdir_rsp *rsp);
 
+server_ctx_t *server_ctx_get (client_t *client, xlator_t *xlator);
+
+int32_t gf_barrier_start (xlator_t *this);
+int32_t gf_barrier_stop (xlator_t *this);
+int32_t gf_barrier_fops_configure (xlator_t *this, gf_barrier_t *barrier,
+                                   char *str);
+void gf_barrier_enqueue (gf_barrier_t *barrier, gf_barrier_payload_t *stub);
+gf_barrier_payload_t *
+gf_barrier_payload (rpcsvc_request_t *req, struct iovec *rsp,
+                    call_frame_t *frame, struct iovec *payload,
+                    int payloadcount, struct iobref *iobref,
+                    struct iobuf *iob, gf_boolean_t free_iobref);
+
 #endif /* !_SERVER_HELPERS_H */
diff --git a/xlators/protocol/server/src/server-mem-types.h b/xlators/protocol/server/src/server-mem-types.h
index 5438ed6db..19c3466d3 100644
--- a/xlators/protocol/server/src/server-mem-types.h
+++ b/xlators/protocol/server/src/server-mem-types.h
@@ -1,20 +1,11 @@
 /*
-  Copyright (c) 2010-2011 Gluster, Inc. <http://www.gluster.com>
+  Copyright (c) 2010-2013 Red Hat, Inc. <http://www.redhat.com>
   This file is part of GlusterFS.
 
-  GlusterFS is free software; you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published
-  by the Free Software Foundation; either version 3 of the License,
-  or (at your option) any later version.
-
-  GlusterFS is distributed in the hope that it will be useful, but
-  WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-  General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see
-  <http://www.gnu.org/licenses/>.
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
 */
 
 
diff --git a/xlators/protocol/server/src/server-resolve.c b/xlators/protocol/server/src/server-resolve.c
index 159f6386d..cc4686a03 100644
--- a/xlators/protocol/server/src/server-resolve.c
+++ b/xlators/protocol/server/src/server-resolve.c
@@ -1,20 +1,11 @@
 /*
-  Copyright (c) 2010-2011 Gluster, Inc. <http://www.gluster.com>
+  Copyright (c) 2010-2013 Red Hat, Inc. <http://www.redhat.com>
   This file is part of GlusterFS.
 
-  GlusterFS is free software; you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published
-  by the Free Software Foundation; either version 3 of the License,
-  or (at your option) any later version.
-
-  GlusterFS is distributed in the hope that it will be useful, but
-  WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-  General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see
-  <http://www.gnu.org/licenses/>.
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
 */
 
 #ifndef _CONFIG_H
@@ -156,7 +147,8 @@ resolve_gfid_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                     (char **) &resolve_loc->path);
 
         STACK_WIND (frame, resolve_gfid_entry_cbk,
-                    BOUND_XL (frame), BOUND_XL (frame)->fops->lookup,
+                    frame->root->client->bound_xl,
+                    frame->root->client->bound_xl->fops->lookup,
                     &resolve->resolve_loc, NULL);
         return 0;
 out:
@@ -188,7 +180,8 @@ resolve_gfid (call_frame_t *frame)
         ret = loc_path (resolve_loc, NULL);
 
         STACK_WIND (frame, resolve_gfid_cbk,
-                    BOUND_XL (frame), BOUND_XL (frame)->fops->lookup,
+                    frame->root->client->bound_xl,
+                    frame->root->client->bound_xl->fops->lookup,
                     &resolve->resolve_loc, NULL);
         return 0;
 }
@@ -458,14 +451,14 @@ server_resolve_anonfd (call_frame_t *frame)
 int
 server_resolve_fd (call_frame_t *frame)
 {
-        server_state_t       *state = NULL;
-        server_resolve_t     *resolve = NULL;
-        server_connection_t  *conn = NULL;
-        uint64_t              fd_no = -1;
+        server_ctx_t         *serv_ctx = NULL;
+        server_state_t       *state    = NULL;
+        client_t             *client   = NULL;
+        server_resolve_t     *resolve  = NULL;
+        uint64_t              fd_no    = -1;
 
         state = CALL_STATE (frame);
         resolve = state->resolve_now;
-        conn  = SERVER_CONNECTION (frame);
 
         fd_no = resolve->fd_no;
 
@@ -474,7 +467,18 @@ server_resolve_fd (call_frame_t *frame)
                 return 0;
         }
 
-        state->fd = gf_fd_fdptr_get (conn->fdtable, fd_no);
+        client = frame->root->client;
+
+        serv_ctx = server_ctx_get (client, client->this);
+
+        if (serv_ctx == NULL) {
+                gf_log ("", GF_LOG_INFO, "server_ctx_get() failed");
+                resolve->op_ret   = -1;
+                resolve->op_errno = ENOMEM;
+                return 0;
+        }
+
+        state->fd = gf_fd_fdptr_get (serv_ctx->fdtable, fd_no);
 
         if (!state->fd) {
                 gf_log ("", GF_LOG_INFO, "fd not found in context");
@@ -529,14 +533,12 @@ int
 server_resolve_done (call_frame_t *frame)
 {
         server_state_t    *state = NULL;
-        xlator_t          *bound_xl = NULL;
 
         state = CALL_STATE (frame);
-        bound_xl = BOUND_XL (frame);
 
         server_print_request (frame);
 
-        state->resume_fn (frame, bound_xl);
+        state->resume_fn (frame, frame->root->client->bound_xl);
 
         return 0;
 }
diff --git a/xlators/protocol/server/src/server-rpc-fops.c b/xlators/protocol/server/src/server-rpc-fops.c
index f44ced41d..138e601ce 100644
--- a/xlators/protocol/server/src/server-rpc-fops.c
+++ b/xlators/protocol/server/src/server-rpc-fops.c
@@ -1,20 +1,11 @@
 /*
-  Copyright (c) 2010-2011 Gluster, Inc. <http://www.gluster.com>
+  Copyright (c) 2010-2013 Red Hat, Inc. <http://www.redhat.com>
   This file is part of GlusterFS.
 
-  GlusterFS is free software; you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published
-  by the Free Software Foundation; either version 3 of the License,
-  or (at your option) any later version.
-
-  GlusterFS is distributed in the hope that it will be useful, but
-  WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-  General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see
-  <http://www.gnu.org/licenses/>.
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
 */
 
 
@@ -33,6 +24,11 @@
 
 #include "xdr-nfs3.h"
 
+#define SERVER_REQ_SET_ERROR(req, ret)                          \
+        do {                                                    \
+                rpcsvc_request_seterr (req, GARBAGE_ARGS);      \
+                ret = RPCSVC_ACTOR_ERROR;                       \
+        } while (0)
 
 /* Callback function section */
 int
@@ -40,17 +36,14 @@ server_statfs_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                    int32_t op_ret, int32_t op_errno, struct statvfs *buf,
                    dict_t *xdata)
 {
-        gfs3_statfs_rsp   rsp = {0,};
-        rpcsvc_request_t *req = NULL;
-
-        req = frame->local;
+        gfs3_statfs_rsp      rsp    = {0,};
+        rpcsvc_request_t    *req    = NULL;
 
-        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, (&rsp.xdata.xdata_val),
+        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, &rsp.xdata.xdata_val,
                                     rsp.xdata.xdata_len, op_errno, out);
 
         if (op_ret < 0) {
-                gf_log (this->name, GF_LOG_WARNING,
-                        "%"PRId64": STATFS (%s)",
+                gf_log (this->name, GF_LOG_WARNING, "%"PRId64": STATFS (%s)",
                         frame->root->unique, strerror (op_errno));
                 goto out;
         }
@@ -61,7 +54,7 @@ out:
         rsp.op_ret    = op_ret;
         rsp.op_errno  = gf_errno_to_error (op_errno);
 
-
+        req = frame->local;
         server_submit_reply (frame, req, &rsp, NULL, 0, NULL,
                              (xdrproc_t)xdr_gfs3_statfs_rsp);
 
@@ -76,16 +69,15 @@ server_lookup_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                    inode_t *inode, struct iatt *stbuf, dict_t *xdata,
                    struct iatt *postparent)
 {
-        rpcsvc_request_t *req        = NULL;
-        server_state_t   *state      = NULL;
-        inode_t          *root_inode = NULL;
-        inode_t          *link_inode = NULL;
-        loc_t             fresh_loc  = {0,};
-        gfs3_lookup_rsp   rsp        = {0,};
-        uuid_t            rootgfid   = {0,};
+        rpcsvc_request_t    *req        = NULL;
+        server_state_t      *state      = NULL;
+        inode_t             *root_inode = NULL;
+        inode_t             *link_inode = NULL;
+        loc_t                fresh_loc  = {0,};
+        gfs3_lookup_rsp      rsp        = {0,};
+        uuid_t               rootgfid   = {0,};
 
-        req = frame->local;
-        state = CALL_STATE(frame);
+        state = CALL_STATE (frame);
 
         if (state->is_revalidate == 1 && op_ret == -1) {
                 state->is_revalidate = 2;
@@ -93,8 +85,9 @@ server_lookup_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                 inode_unref (fresh_loc.inode);
                 fresh_loc.inode = inode_new (state->itable);
 
-                STACK_WIND (frame, server_lookup_cbk, BOUND_XL (frame),
-                            BOUND_XL (frame)->fops->lookup,
+                STACK_WIND (frame, server_lookup_cbk,
+                            frame->root->client->bound_xl,
+                            frame->root->client->bound_xl->fops->lookup,
                             &fresh_loc, state->xdata);
 
                 loc_wipe (&fresh_loc);
@@ -103,7 +96,7 @@ server_lookup_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
 
         gf_stat_from_iatt (&rsp.postparent, postparent);
 
-        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, (&rsp.xdata.xdata_val),
+        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, &rsp.xdata.xdata_val,
                                     rsp.xdata.xdata_len, op_errno, out);
 
         if (op_ret) {
@@ -117,7 +110,7 @@ server_lookup_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                 goto out;
         }
 
-        root_inode = BOUND_XL(frame)->itable->root;
+        root_inode = frame->root->client->bound_xl->itable->root;
         if (inode == root_inode) {
                 /* we just looked up root ("/") */
                 stbuf->ia_ino = 1;
@@ -146,8 +139,9 @@ out:
                 if (state->resolve.bname) {
                         gf_log (this->name, ((op_errno == ENOENT) ?
                                              GF_LOG_TRACE : GF_LOG_INFO),
-                                "%"PRId64": LOOKUP %s (%s/%s) ==> (%s)",
-                                frame->root->unique, state->loc.path,
+                                "%"PRId64": LOOKUP %s (%s/%s) ==> "
+                                "(%s)", frame->root->unique,
+                                state->loc.path,
                                 uuid_utoa (state->resolve.pargfid),
                                 state->resolve.bname,
                                 strerror (op_errno));
@@ -161,6 +155,7 @@ out:
                 }
         }
 
+        req = frame->local;
         server_submit_reply (frame, req, &rsp, NULL, 0, NULL,
                              (xdrproc_t)xdr_gfs3_lookup_rsp);
 
@@ -175,21 +170,20 @@ server_lk_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                int32_t op_ret, int32_t op_errno, struct gf_flock *lock,
                dict_t *xdata)
 {
-        gfs3_lk_rsp       rsp   = {0,};
-        rpcsvc_request_t *req   = NULL;
-        server_state_t   *state = NULL;
-
-        req = frame->local;
-        state = CALL_STATE(frame);
+        gfs3_lk_rsp          rsp   = {0,};
+        rpcsvc_request_t    *req   = NULL;
+        server_state_t      *state = NULL;
 
-        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, (&rsp.xdata.xdata_val),
+        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, &rsp.xdata.xdata_val,
                                     rsp.xdata.xdata_len, op_errno, out);
 
         if (op_ret) {
                 if ((op_errno != ENOSYS) && (op_errno != EAGAIN)) {
+                        state = CALL_STATE (frame);
                         gf_log (this->name, GF_LOG_INFO,
-                                "%"PRId64": LK %"PRId64" (%s) ==> (%s)",
-                                frame->root->unique, state->resolve.fd_no,
+                                "%"PRId64": LK %"PRId64" (%s) ==> "
+                                "(%s)", frame->root->unique,
+                                state->resolve.fd_no,
                                 uuid_utoa (state->resolve.gfid),
                                 strerror (op_errno));
                 }
@@ -218,6 +212,7 @@ out:
         rsp.op_ret    = op_ret;
         rsp.op_errno  = gf_errno_to_error (op_errno);
 
+        req = frame->local;
         server_submit_reply (frame, req, &rsp, NULL, 0, NULL,
                              (xdrproc_t)xdr_gfs3_lk_rsp);
 
@@ -231,21 +226,19 @@ int
 server_inodelk_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                     int32_t op_ret, int32_t op_errno, dict_t *xdata)
 {
-        gf_common_rsp        rsp   = {0,};
-        server_connection_t *conn  = NULL;
-        server_state_t      *state = NULL;
-        rpcsvc_request_t    *req   = NULL;
-
-        req = frame->local;
-        conn = SERVER_CONNECTION(frame);
-        state = CALL_STATE(frame);
+        gf_common_rsp    rsp        = {0,};
+        server_state_t   *state     = NULL;
+        rpcsvc_request_t *req       = NULL;
 
-        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, (&rsp.xdata.xdata_val),
+        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, &rsp.xdata.xdata_val,
                                     rsp.xdata.xdata_len, op_errno, out);
 
+        state = CALL_STATE (frame);
+
         if (op_ret < 0) {
                 if ((op_errno != ENOSYS) && (op_errno != EAGAIN)) {
-                        gf_log (this->name, GF_LOG_INFO,
+                        gf_log (this->name, (op_errno == ENOENT)?
+                                GF_LOG_DEBUG:GF_LOG_ERROR,
                                 "%"PRId64": INODELK %s (%s) ==> (%s)",
                                 frame->root->unique, state->loc.path,
                                 uuid_utoa (state->resolve.gfid),
@@ -254,20 +247,11 @@ server_inodelk_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                 goto out;
         }
 
-        if (state->flock.l_type == F_UNLCK)
-                gf_del_locker (conn, state->volume,
-                               &state->loc, NULL, &frame->root->lk_owner,
-                               GF_FOP_INODELK);
-        else
-                gf_add_locker (conn, state->volume,
-                               &state->loc, NULL, frame->root->pid,
-                               &frame->root->lk_owner,
-                               GF_FOP_INODELK);
-
 out:
         rsp.op_ret    = op_ret;
         rsp.op_errno  = gf_errno_to_error (op_errno);
 
+        req = frame->local;
         server_submit_reply (frame, req, &rsp, NULL, 0, NULL,
                              (xdrproc_t)xdr_gf_common_rsp);
 
@@ -281,43 +265,32 @@ int
 server_finodelk_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                      int32_t op_ret, int32_t op_errno, dict_t *xdata)
 {
-        gf_common_rsp        rsp   = {0,};
-        server_state_t      *state = NULL;
-        server_connection_t *conn  = NULL;
-        rpcsvc_request_t    *req   = NULL;
-
-        req = frame->local;
-        conn = SERVER_CONNECTION(frame);
-        state = CALL_STATE(frame);
+        gf_common_rsp     rsp       = {0,};
+        server_state_t   *state     = NULL;
+        rpcsvc_request_t *req       = NULL;
 
-        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, (&rsp.xdata.xdata_val),
+        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, &rsp.xdata.xdata_val,
                                     rsp.xdata.xdata_len, op_errno, out);
 
+        state = CALL_STATE (frame);
+
         if (op_ret < 0) {
                 if ((op_errno != ENOSYS) && (op_errno != EAGAIN)) {
                         gf_log (this->name, GF_LOG_INFO,
-                                "%"PRId64": FINODELK %"PRId64" (%s) ==> (%s)",
-                                frame->root->unique, state->resolve.fd_no,
+                                "%"PRId64": FINODELK %"PRId64" (%s) "
+                                "==> (%s)", frame->root->unique,
+                                state->resolve.fd_no,
                                 uuid_utoa (state->resolve.gfid),
                                 strerror (op_errno));
                 }
                 goto out;
         }
 
-        if (state->flock.l_type == F_UNLCK)
-                gf_del_locker (conn, state->volume,
-                               NULL, state->fd,
-                               &frame->root->lk_owner,  GF_FOP_INODELK);
-        else
-                gf_add_locker (conn, state->volume,
-                               NULL, state->fd,
-                               frame->root->pid,
-                               &frame->root->lk_owner, GF_FOP_INODELK);
-
 out:
         rsp.op_ret    = op_ret;
         rsp.op_errno  = gf_errno_to_error (op_errno);
 
+        req = frame->local;
         server_submit_reply (frame, req, &rsp, NULL, 0, NULL,
                              (xdrproc_t)xdr_gf_common_rsp);
 
@@ -330,18 +303,15 @@ int
 server_entrylk_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                     int32_t op_ret, int32_t op_errno, dict_t *xdata)
 {
-        server_connection_t *conn  = NULL;
-        server_state_t      *state = NULL;
-        rpcsvc_request_t    *req   = NULL;
-        gf_common_rsp        rsp   = {0,};
+        gf_common_rsp     rsp       = {0,};
+        server_state_t   *state     = NULL;
+        rpcsvc_request_t *req       = NULL;
 
-        req = frame->local;
-        conn = SERVER_CONNECTION(frame);
-        state = CALL_STATE(frame);
-
-        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, (&rsp.xdata.xdata_val),
+        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, &rsp.xdata.xdata_val,
                                     rsp.xdata.xdata_len, op_errno, out);
 
+        state = CALL_STATE (frame);
+
         if (op_ret < 0) {
                 if ((op_errno != ENOSYS) && (op_errno != EAGAIN)) {
                         gf_log (this->name, GF_LOG_INFO,
@@ -353,20 +323,11 @@ server_entrylk_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                 goto out;
         }
 
-        if (state->cmd == ENTRYLK_UNLOCK)
-                gf_del_locker (conn, state->volume,
-                               &state->loc, NULL, &frame->root->lk_owner,
-                               GF_FOP_ENTRYLK);
-        else
-                gf_add_locker (conn, state->volume,
-                               &state->loc, NULL, frame->root->pid,
-                               &frame->root->lk_owner,
-                               GF_FOP_ENTRYLK);
-
 out:
         rsp.op_ret    = op_ret;
         rsp.op_errno  = gf_errno_to_error (op_errno);
 
+        req = frame->local;
         server_submit_reply (frame, req, &rsp, NULL, 0, NULL,
                              (xdrproc_t)xdr_gf_common_rsp);
 
@@ -380,18 +341,15 @@ int
 server_fentrylk_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                      int32_t op_ret, int32_t op_errno, dict_t *xdata)
 {
-        gf_common_rsp        rsp   = {0,};
-        server_connection_t *conn  = NULL;
-        server_state_t      *state = NULL;
-        rpcsvc_request_t    *req   = NULL;
+        gf_common_rsp     rsp       = {0,};
+        server_state_t   *state     = NULL;
+        rpcsvc_request_t *req       = NULL;
 
-        req   = frame->local;
-        conn  = SERVER_CONNECTION(frame);
-        state = CALL_STATE(frame);
-
-        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, (&rsp.xdata.xdata_val),
+        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, &rsp.xdata.xdata_val,
                                     rsp.xdata.xdata_len, op_errno, out);
 
+        state = CALL_STATE (frame);
+
         if (op_ret < 0) {
                 if ((op_errno != ENOSYS) && (op_errno != EAGAIN)) {
                         gf_log (this->name, GF_LOG_INFO,
@@ -403,19 +361,11 @@ server_fentrylk_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                 goto out;
         }
 
-        if (state->cmd == ENTRYLK_UNLOCK)
-                gf_del_locker (conn, state->volume,
-                               NULL, state->fd, &frame->root->lk_owner,
-                               GF_FOP_ENTRYLK);
-        else
-                gf_add_locker (conn, state->volume,
-                               NULL, state->fd, frame->root->pid,
-                               &frame->root->lk_owner, GF_FOP_ENTRYLK);
-
 out:
         rsp.op_ret    = op_ret;
         rsp.op_errno  = gf_errno_to_error (op_errno);
 
+        req   = frame->local;
         server_submit_reply (frame, req, &rsp, NULL, 0, NULL,
                              (xdrproc_t)xdr_gf_common_rsp);
 
@@ -429,17 +379,15 @@ int
 server_access_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                    int32_t op_ret, int32_t op_errno, dict_t *xdata)
 {
-        gf_common_rsp     rsp = {0,};
-        rpcsvc_request_t *req = NULL;
-        server_state_t   *state = NULL;
-
-        req = frame->local;
-        state = CALL_STATE(frame);
+        gf_common_rsp        rsp   = {0,};
+        rpcsvc_request_t    *req   = NULL;
+        server_state_t      *state = NULL;
 
-        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, (&rsp.xdata.xdata_val),
+        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, &rsp.xdata.xdata_val,
                                     rsp.xdata.xdata_len, op_errno, out);
 
         if (op_ret) {
+                state = CALL_STATE (frame);
                 gf_log (this->name, GF_LOG_INFO,
                         "%"PRId64": ACCESS %s (%s) ==> (%s)",
                         frame->root->unique, state->loc.path,
@@ -452,6 +400,7 @@ out:
         rsp.op_ret    = op_ret;
         rsp.op_errno  = gf_errno_to_error (op_errno);
 
+        req = frame->local;
         server_submit_reply (frame, req, &rsp, NULL, 0, NULL,
                              (xdrproc_t)xdr_gf_common_rsp);
 
@@ -465,17 +414,16 @@ server_rmdir_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                   int32_t op_ret, int32_t op_errno, struct iatt *preparent,
                   struct iatt *postparent, dict_t *xdata)
 {
-        gfs3_rmdir_rsp    rsp    = {0,};
-        server_state_t   *state  = NULL;
-        inode_t          *parent = NULL;
-        rpcsvc_request_t *req    = NULL;
-
-        req = frame->local;
-        state = CALL_STATE(frame);
+        gfs3_rmdir_rsp       rsp    = {0,};
+        server_state_t      *state  = NULL;
+        inode_t             *parent = NULL;
+        rpcsvc_request_t    *req    = NULL;
 
-        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, (&rsp.xdata.xdata_val),
+        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, &rsp.xdata.xdata_val,
                                     rsp.xdata.xdata_len, op_errno, out);
 
+        state = CALL_STATE (frame);
+
         if (op_ret) {
                 gf_log (this->name, GF_LOG_INFO,
                         "%"PRId64": RMDIR %s (%s/%s) ==> (%s)",
@@ -504,6 +452,7 @@ out:
         rsp.op_ret    = op_ret;
         rsp.op_errno  = gf_errno_to_error (op_errno);
 
+        req = frame->local;
         server_submit_reply (frame, req, &rsp, NULL, 0, NULL,
                              (xdrproc_t)xdr_gfs3_rmdir_rsp);
 
@@ -518,17 +467,16 @@ server_mkdir_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                   struct iatt *stbuf, struct iatt *preparent,
                   struct iatt *postparent, dict_t *xdata)
 {
-        gfs3_mkdir_rsp    rsp        = {0,};
-        server_state_t   *state      = NULL;
-        inode_t          *link_inode = NULL;
-        rpcsvc_request_t *req        = NULL;
-
-        req = frame->local;
-        state = CALL_STATE(frame);
+        gfs3_mkdir_rsp       rsp        = {0,};
+        server_state_t      *state      = NULL;
+        inode_t             *link_inode = NULL;
+        rpcsvc_request_t    *req        = NULL;
 
-        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, (&rsp.xdata.xdata_val),
+        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, &rsp.xdata.xdata_val,
                                     rsp.xdata.xdata_len, op_errno, out);
 
+        state = CALL_STATE (frame);
+
         if (op_ret < 0) {
                 gf_log (this->name, GF_LOG_INFO,
                         "%"PRId64": MKDIR %s (%s/%s) ==> (%s)",
@@ -551,6 +499,7 @@ out:
         rsp.op_ret    = op_ret;
         rsp.op_errno  = gf_errno_to_error (op_errno);
 
+        req = frame->local;
         server_submit_reply (frame, req, &rsp, NULL, 0, NULL,
                              (xdrproc_t)xdr_gfs3_mkdir_rsp);
 
@@ -565,17 +514,16 @@ server_mknod_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                   inode_t *inode, struct iatt *stbuf, struct iatt *preparent,
                   struct iatt *postparent, dict_t *xdata)
 {
-        gfs3_mknod_rsp    rsp        = {0,};
-        server_state_t   *state      = NULL;
-        inode_t          *link_inode = NULL;
-        rpcsvc_request_t *req        = NULL;
-
-        req = frame->local;
-        state = CALL_STATE(frame);
+        gfs3_mknod_rsp       rsp        = {0,};
+        server_state_t      *state      = NULL;
+        inode_t             *link_inode = NULL;
+        rpcsvc_request_t    *req        = NULL;
 
-        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, (&rsp.xdata.xdata_val),
+        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, &rsp.xdata.xdata_val,
                                     rsp.xdata.xdata_len, op_errno, out);
 
+        state = CALL_STATE (frame);
+
         if (op_ret < 0) {
                 gf_log (this->name, GF_LOG_INFO,
                         "%"PRId64": MKNOD %s (%s/%s) ==> (%s)",
@@ -598,6 +546,7 @@ out:
         rsp.op_ret    = op_ret;
         rsp.op_errno  = gf_errno_to_error (op_errno);
 
+        req = frame->local;
         server_submit_reply (frame, req, &rsp, NULL, 0, NULL,
                              (xdrproc_t)xdr_gfs3_mknod_rsp);
 
@@ -610,17 +559,15 @@ int
 server_fsyncdir_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                      int32_t op_ret, int32_t op_errno, dict_t *xdata)
 {
-        gf_common_rsp     rsp   = {0,};
-        server_state_t   *state = NULL;
-        rpcsvc_request_t *req   = NULL;
-
-        req = frame->local;
-        state = CALL_STATE(frame);
+        gf_common_rsp        rsp   = {0,};
+        server_state_t      *state = NULL;
+        rpcsvc_request_t    *req   = NULL;
 
-        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, (&rsp.xdata.xdata_val),
+        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, &rsp.xdata.xdata_val,
                                     rsp.xdata.xdata_len, op_errno, out);
 
         if (op_ret < 0) {
+                state = CALL_STATE (frame);
                 gf_log (this->name, GF_LOG_INFO,
                         "%"PRId64": FSYNCDIR %"PRId64" (%s) ==> (%s)",
                         frame->root->unique, state->resolve.fd_no,
@@ -633,6 +580,7 @@ out:
         rsp.op_ret    = op_ret;
         rsp.op_errno  = gf_errno_to_error (op_errno);
 
+        req = frame->local;
         server_submit_reply (frame, req, &rsp, NULL, 0, NULL,
                              (xdrproc_t)xdr_gf_common_rsp);
 
@@ -646,18 +594,16 @@ server_readdir_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                     int32_t op_ret, int32_t op_errno, gf_dirent_t *entries,
                     dict_t *xdata)
 {
-        gfs3_readdir_rsp  rsp   = {0,};
-        server_state_t   *state = NULL;
-        rpcsvc_request_t *req   = NULL;
-        int               ret   = 0;
-
-        req = frame->local;
-        state = CALL_STATE(frame);
+        gfs3_readdir_rsp     rsp   = {0,};
+        server_state_t      *state = NULL;
+        rpcsvc_request_t    *req   = NULL;
+        int                  ret   = 0;
 
-        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, (&rsp.xdata.xdata_val),
+        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, &rsp.xdata.xdata_val,
                                     rsp.xdata.xdata_len, op_errno, out);
 
         if (op_ret < 0) {
+                state = CALL_STATE (frame);
                 gf_log (this->name, GF_LOG_INFO,
                         "%"PRId64": READDIR %"PRId64" (%s) ==> (%s)",
                         frame->root->unique, state->resolve.fd_no,
@@ -680,6 +626,7 @@ out:
         rsp.op_ret    = op_ret;
         rsp.op_errno  = gf_errno_to_error (op_errno);
 
+        req = frame->local;
         server_submit_reply (frame, req, &rsp, NULL, 0, NULL,
                              (xdrproc_t)xdr_gfs3_readdir_rsp);
 
@@ -694,29 +641,33 @@ int
 server_opendir_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                     int32_t op_ret, int32_t op_errno, fd_t *fd, dict_t *xdata)
 {
-        server_connection_t *conn  = NULL;
-        server_state_t      *state = NULL;
-        rpcsvc_request_t    *req   = NULL;
-        gfs3_opendir_rsp     rsp   = {0,};
-        uint64_t             fd_no = 0;
-
-        req = frame->local;
-        conn = SERVER_CONNECTION (frame);
-        state = CALL_STATE (frame);
+        server_state_t      *state    = NULL;
+        server_ctx_t        *serv_ctx = NULL;
+        rpcsvc_request_t    *req      = NULL;
+        gfs3_opendir_rsp     rsp      = {0,};
+        uint64_t             fd_no    = 0;
 
-        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, (&rsp.xdata.xdata_val),
+        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, &rsp.xdata.xdata_val,
                                     rsp.xdata.xdata_len, op_errno, out);
 
         if (op_ret < 0) {
-                gf_log (this->name, GF_LOG_INFO,
+                state = CALL_STATE (frame);
+                gf_log (this->name, (op_errno == ENOENT)?
+                        GF_LOG_DEBUG:GF_LOG_ERROR,
                         "%"PRId64": OPENDIR %s (%s) ==> (%s)",
                         frame->root->unique, state->loc.path,
                         uuid_utoa (state->resolve.gfid), strerror (op_errno));
                 goto out;
         }
 
+        serv_ctx = server_ctx_get (frame->root->client, this);
+        if (serv_ctx == NULL) {
+                gf_log (this->name, GF_LOG_INFO, "server_ctx_get() failed");
+                goto out;
+        }
+
         fd_bind (fd);
-        fd_no = gf_fd_unused_get (conn->fdtable, fd);
+        fd_no = gf_fd_unused_get (serv_ctx->fdtable, fd);
         fd_ref (fd); // on behalf of the client
 
 out:
@@ -724,6 +675,7 @@ out:
         rsp.op_ret    = op_ret;
         rsp.op_errno  = gf_errno_to_error (op_errno);
 
+        req = frame->local;
         server_submit_reply (frame, req, &rsp, NULL, 0, NULL,
                              (xdrproc_t)xdr_gfs3_opendir_rsp);
 
@@ -736,17 +688,15 @@ int
 server_removexattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                         int32_t op_ret, int32_t op_errno, dict_t *xdata)
 {
-        gf_common_rsp     rsp = {0,};
-        rpcsvc_request_t *req = NULL;
-        server_state_t   *state = NULL;
-
-        req   = frame->local;
-        state = CALL_STATE(frame);
+        gf_common_rsp        rsp   = {0,};
+        rpcsvc_request_t    *req   = NULL;
+        server_state_t      *state = NULL;
 
-        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, (&rsp.xdata.xdata_val),
+        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, &rsp.xdata.xdata_val,
                                     rsp.xdata.xdata_len, op_errno, out);
 
         if (op_ret == -1) {
+                state = CALL_STATE (frame);
                 gf_log (this->name, GF_LOG_INFO,
                         "%"PRId64": REMOVEXATTR %s (%s) of key %s ==> (%s)",
                         frame->root->unique, state->loc.path,
@@ -759,6 +709,7 @@ out:
         rsp.op_ret    = op_ret;
         rsp.op_errno  = gf_errno_to_error (op_errno);
 
+        req   = frame->local;
         server_submit_reply (frame, req, &rsp, NULL, 0, NULL,
                              (xdrproc_t)xdr_gf_common_rsp);
 
@@ -771,17 +722,15 @@ int
 server_fremovexattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                          int32_t op_ret, int32_t op_errno, dict_t *xdata)
 {
-        gf_common_rsp     rsp = {0,};
-        rpcsvc_request_t *req = NULL;
+        gf_common_rsp        rsp   = {0,};
+        rpcsvc_request_t    *req   = NULL;
         server_state_t      *state = NULL;
 
-        req   = frame->local;
-        state = CALL_STATE(frame);
-
-        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, (&rsp.xdata.xdata_val),
+        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, &rsp.xdata.xdata_val,
                                     rsp.xdata.xdata_len, op_errno, out);
 
         if (op_ret == -1) {
+                state = CALL_STATE (frame);
                 gf_log (this->name, GF_LOG_INFO,
                         "%"PRId64": FREMOVEXATTR %"PRId64" (%s) (%s) ==> (%s)",
                         frame->root->unique, state->resolve.fd_no,
@@ -794,6 +743,7 @@ out:
         rsp.op_ret    = op_ret;
         rsp.op_errno  = gf_errno_to_error (op_errno);
 
+        req   = frame->local;
         server_submit_reply (frame, req, &rsp, NULL, 0, NULL,
                              (xdrproc_t)xdr_gf_common_rsp);
 
@@ -807,17 +757,15 @@ server_getxattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                      int32_t op_ret, int32_t op_errno, dict_t *dict,
                      dict_t *xdata)
 {
-        gfs3_getxattr_rsp  rsp   = {0,};
-        rpcsvc_request_t  *req   = NULL;
-        server_state_t    *state = NULL;
-
-        req = frame->local;
-        state = CALL_STATE (frame);
+        gfs3_getxattr_rsp    rsp   = {0,};
+        rpcsvc_request_t    *req   = NULL;
+        server_state_t      *state = NULL;
 
-        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, (&rsp.xdata.xdata_val),
+        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, &rsp.xdata.xdata_val,
                                     rsp.xdata.xdata_len, op_errno, out);
 
         if (op_ret == -1) {
+                state = CALL_STATE (frame);
                 gf_log (this->name, (((op_errno == ENOTSUP) ||
                                       (op_errno == ENODATA) ||
                                       (op_errno == ENOENT)) ?
@@ -829,13 +777,14 @@ server_getxattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                 goto out;
         }
 
-        GF_PROTOCOL_DICT_SERIALIZE (this, dict, (&rsp.dict.dict_val),
+        GF_PROTOCOL_DICT_SERIALIZE (this, dict, &rsp.dict.dict_val,
                                     rsp.dict.dict_len, op_errno, out);
 
 out:
         rsp.op_ret        = op_ret;
         rsp.op_errno      = gf_errno_to_error (op_errno);
 
+        req = frame->local;
         server_submit_reply (frame, req, &rsp, NULL, 0, NULL,
                              (xdrproc_t)xdr_gfs3_getxattr_rsp);
 
@@ -852,17 +801,15 @@ server_fgetxattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                       int32_t op_ret, int32_t op_errno, dict_t *dict,
                       dict_t *xdata)
 {
-        gfs3_fgetxattr_rsp  rsp   = {0,};
-        server_state_t     *state = NULL;
-        rpcsvc_request_t   *req   = NULL;
-
-        req = frame->local;
-        state = CALL_STATE (frame);
+        gfs3_fgetxattr_rsp   rsp   = {0,};
+        server_state_t      *state = NULL;
+        rpcsvc_request_t    *req   = NULL;
 
-        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, (&rsp.xdata.xdata_val),
+        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, &rsp.xdata.xdata_val,
                                     rsp.xdata.xdata_len, op_errno, out);
 
         if (op_ret == -1) {
+                state = CALL_STATE (frame);
                 gf_log (this->name, ((op_errno == ENOTSUP) ?
                                      GF_LOG_DEBUG : GF_LOG_INFO),
                         "%"PRId64": FGETXATTR %"PRId64" (%s) (%s) ==> (%s)",
@@ -872,7 +819,7 @@ server_fgetxattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                 goto out;
         }
 
-        GF_PROTOCOL_DICT_SERIALIZE (this, dict, (&rsp.dict.dict_val),
+        GF_PROTOCOL_DICT_SERIALIZE (this, dict, &rsp.dict.dict_val,
                                     rsp.dict.dict_len, op_errno, out);
 
 out:
@@ -880,6 +827,7 @@ out:
         rsp.op_ret        = op_ret;
         rsp.op_errno      = gf_errno_to_error (op_errno);
 
+        req = frame->local;
         server_submit_reply (frame, req, &rsp, NULL, 0, NULL,
                              (xdrproc_t)xdr_gfs3_fgetxattr_rsp);
 
@@ -895,11 +843,11 @@ static int
 _gf_server_log_setxattr_failure (dict_t *d, char *k, data_t *v,
                                  void *tmp)
 {
-        server_state_t *state = NULL;
-        call_frame_t   *frame = NULL;
+        server_state_t      *state = NULL;
+        call_frame_t        *frame = NULL;
 
         frame = tmp;
-        state = CALL_STATE(frame);
+        state = CALL_STATE (frame);
 
         gf_log (THIS->name, GF_LOG_INFO,
                 "%"PRId64": SETXATTR %s (%s) ==> %s",
@@ -916,13 +864,11 @@ server_setxattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
         rpcsvc_request_t *req = NULL;
         server_state_t      *state = NULL;
 
-        req = frame->local;
-        state = CALL_STATE(frame);
-
-        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, (&rsp.xdata.xdata_val),
+        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, &rsp.xdata.xdata_val,
                                     rsp.xdata.xdata_len, op_errno, out);
 
         if (op_ret == -1) {
+                state = CALL_STATE (frame);
                 if (op_errno != ENOTSUP)
                         dict_foreach (state->dict,
                                       _gf_server_log_setxattr_failure,
@@ -938,6 +884,7 @@ out:
         rsp.op_ret    = op_ret;
         rsp.op_errno  = gf_errno_to_error (op_errno);
 
+        req = frame->local;
         server_submit_reply (frame, req, &rsp, NULL, 0, NULL,
                              (xdrproc_t)xdr_gf_common_rsp);
 
@@ -951,11 +898,11 @@ static int
 _gf_server_log_fsetxattr_failure (dict_t *d, char *k, data_t *v,
                                  void *tmp)
 {
-        call_frame_t   *frame = NULL;
-        server_state_t *state = NULL;
+        call_frame_t        *frame = NULL;
+        server_state_t      *state = NULL;
 
         frame = tmp;
-        state = CALL_STATE(frame);
+        state = CALL_STATE (frame);
 
         gf_log (THIS->name, GF_LOG_INFO,
                 "%"PRId64": FSETXATTR %"PRId64" (%s) ==> %s",
@@ -973,13 +920,11 @@ server_fsetxattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
         rpcsvc_request_t *req = NULL;
         server_state_t      *state = NULL;
 
-        req = frame->local;
-        state = CALL_STATE(frame);
-
-        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, (&rsp.xdata.xdata_val),
+        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, &rsp.xdata.xdata_val,
                                     rsp.xdata.xdata_len, op_errno, out);
 
         if (op_ret == -1) {
+                state = CALL_STATE (frame);
                 if (op_errno != ENOTSUP) {
                         dict_foreach (state->dict,
                                       _gf_server_log_fsetxattr_failure,
@@ -995,6 +940,7 @@ out:
         rsp.op_ret    = op_ret;
         rsp.op_errno  = gf_errno_to_error (op_errno);
 
+        req = frame->local;
         server_submit_reply (frame, req, &rsp, NULL, 0, NULL,
                              (xdrproc_t)xdr_gf_common_rsp);
 
@@ -1010,20 +956,19 @@ server_rename_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                    struct iatt *prenewparent, struct iatt *postnewparent,
                    dict_t *xdata)
 {
-        gfs3_rename_rsp   rsp   = {0,};
-        server_state_t   *state = NULL;
-        rpcsvc_request_t *req   = NULL;
-        inode_t     *tmp_inode = NULL;
-        inode_t     *tmp_parent = NULL;
-        char         oldpar_str[50] = {0,};
-        char         newpar_str[50] = {0,};
-
-        req   = frame->local;
-        state = CALL_STATE(frame);
+        gfs3_rename_rsp      rsp        = {0,};
+        server_state_t      *state      = NULL;
+        rpcsvc_request_t    *req        = NULL;
+        inode_t             *tmp_inode  = NULL;
+        inode_t             *tmp_parent = NULL;
+        char         oldpar_str[50]     = {0,};
+        char         newpar_str[50]     = {0,};
 
-        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, (&rsp.xdata.xdata_val),
+        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, &rsp.xdata.xdata_val,
                                     rsp.xdata.xdata_len, op_errno, out);
 
+        state = CALL_STATE (frame);
+
         if (op_ret == -1) {
                 uuid_utoa_r (state->resolve.gfid, oldpar_str);
                 uuid_utoa_r (state->resolve2.gfid, newpar_str);
@@ -1038,7 +983,7 @@ server_rename_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
         stbuf->ia_type = state->loc.inode->ia_type;
 
         /* TODO: log gfid of the inodes */
-        gf_log (state->conn->bound_xl->name, GF_LOG_TRACE,
+        gf_log (frame->root->client->bound_xl->name, GF_LOG_TRACE,
                 "%"PRId64": RENAME_CBK  %s ==> %s",
                 frame->root->unique, state->loc.name, state->loc2.name);
 
@@ -1080,6 +1025,7 @@ out:
         rsp.op_ret    = op_ret;
         rsp.op_errno  = gf_errno_to_error (op_errno);
 
+        req   = frame->local;
         server_submit_reply (frame, req, &rsp, NULL, 0, NULL,
                              (xdrproc_t)xdr_gfs3_rename_rsp);
 
@@ -1093,17 +1039,16 @@ server_unlink_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                    int32_t op_ret, int32_t op_errno, struct iatt *preparent,
                    struct iatt *postparent, dict_t *xdata)
 {
-        gfs3_unlink_rsp   rsp    = {0,};
-        server_state_t   *state  = NULL;
-        inode_t          *parent = NULL;
-        rpcsvc_request_t *req    = NULL;
-
-        req = frame->local;
-        state = CALL_STATE(frame);
+        gfs3_unlink_rsp      rsp    = {0,};
+        server_state_t      *state  = NULL;
+        inode_t             *parent = NULL;
+        rpcsvc_request_t    *req    = NULL;
 
-        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, (&rsp.xdata.xdata_val),
+        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, &rsp.xdata.xdata_val,
                                     rsp.xdata.xdata_len, op_errno, out);
 
+        state = CALL_STATE (frame);
+
         if (op_ret) {
                 gf_log (this->name, (op_errno == ENOENT)?
                         GF_LOG_DEBUG:GF_LOG_ERROR,
@@ -1115,7 +1060,7 @@ server_unlink_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
         }
 
         /* TODO: log gfid of the inodes */
-        gf_log (state->conn->bound_xl->name, GF_LOG_TRACE,
+        gf_log (frame->root->client->bound_xl->name, GF_LOG_TRACE,
                 "%"PRId64": UNLINK_CBK %s",
                 frame->root->unique, state->loc.name);
 
@@ -1135,6 +1080,7 @@ out:
         rsp.op_ret    = op_ret;
         rsp.op_errno  = gf_errno_to_error (op_errno);
 
+        req = frame->local;
         server_submit_reply (frame, req, &rsp, NULL, 0, NULL,
                              (xdrproc_t)xdr_gfs3_unlink_rsp);
 
@@ -1149,17 +1095,16 @@ server_symlink_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                     struct iatt *stbuf, struct iatt *preparent,
                     struct iatt *postparent, dict_t *xdata)
 {
-        gfs3_symlink_rsp  rsp        = {0,};
-        server_state_t   *state      = NULL;
-        inode_t          *link_inode = NULL;
-        rpcsvc_request_t *req        = NULL;
-
-        req = frame->local;
-        state = CALL_STATE(frame);
+        gfs3_symlink_rsp     rsp        = {0,};
+        server_state_t      *state      = NULL;
+        inode_t             *link_inode = NULL;
+        rpcsvc_request_t    *req        = NULL;
 
-        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, (&rsp.xdata.xdata_val),
+        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, &rsp.xdata.xdata_val,
                                     rsp.xdata.xdata_len, op_errno, out);
 
+        state = CALL_STATE (frame);
+
         if (op_ret < 0) {
                 gf_log (this->name, GF_LOG_INFO,
                         "%"PRId64": SYMLINK %s (%s/%s) ==> (%s)",
@@ -1182,6 +1127,7 @@ out:
         rsp.op_ret    = op_ret;
         rsp.op_errno  = gf_errno_to_error (op_errno);
 
+        req = frame->local;
         server_submit_reply (frame, req, &rsp, NULL, 0, NULL,
                              (xdrproc_t)xdr_gfs3_symlink_rsp);
 
@@ -1197,27 +1143,27 @@ server_link_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                  struct iatt *stbuf, struct iatt *preparent,
                  struct iatt *postparent, dict_t *xdata)
 {
-        gfs3_link_rsp     rsp        = {0,};
-        server_state_t   *state      = NULL;
-        inode_t          *link_inode = NULL;
-        rpcsvc_request_t *req        = NULL;
+        gfs3_link_rsp        rsp         = {0,};
+        server_state_t      *state       = NULL;
+        inode_t             *link_inode  = NULL;
+        rpcsvc_request_t    *req         = NULL;
         char              gfid_str[50]   = {0,};
         char              newpar_str[50] = {0,};
 
-        req = frame->local;
-        state = CALL_STATE(frame);
-
-        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, (&rsp.xdata.xdata_val),
+        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, &rsp.xdata.xdata_val,
                                     rsp.xdata.xdata_len, op_errno, out);
 
+        state = CALL_STATE (frame);
+
         if (op_ret) {
                 uuid_utoa_r (state->resolve.gfid, gfid_str);
                 uuid_utoa_r (state->resolve2.pargfid, newpar_str);
 
                 gf_log (this->name, GF_LOG_INFO,
                         "%"PRId64": LINK %s (%s) -> %s/%s ==> (%s)",
-                        frame->root->unique, state->loc.path, gfid_str,
-                        newpar_str, state->resolve2.bname, strerror (op_errno));
+                        frame->root->unique, state->loc.path,
+                        gfid_str, newpar_str, state->resolve2.bname,
+                        strerror (op_errno));
                 goto out;
         }
 
@@ -1233,6 +1179,7 @@ out:
         rsp.op_ret    = op_ret;
         rsp.op_errno  = gf_errno_to_error (op_errno);
 
+        req = frame->local;
         server_submit_reply (frame, req, &rsp, NULL, 0, NULL,
                              (xdrproc_t)xdr_gfs3_link_rsp);
 
@@ -1246,17 +1193,15 @@ server_truncate_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                      int32_t op_ret, int32_t op_errno, struct iatt *prebuf,
                      struct iatt *postbuf, dict_t *xdata)
 {
-        gfs3_truncate_rsp  rsp   = {0,};
-        server_state_t    *state = NULL;
-        rpcsvc_request_t  *req   = NULL;
-
-        req = frame->local;
-        state = CALL_STATE (frame);
+        gfs3_truncate_rsp    rsp   = {0,};
+        server_state_t      *state = NULL;
+        rpcsvc_request_t    *req   = NULL;
 
-        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, (&rsp.xdata.xdata_val),
+        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, &rsp.xdata.xdata_val,
                                     rsp.xdata.xdata_len, op_errno, out);
 
         if (op_ret) {
+                state = CALL_STATE (frame);
                 gf_log (this->name, GF_LOG_INFO,
                         "%"PRId64": TRUNCATE %s (%s) ==> (%s)",
                         frame->root->unique, state->loc.path,
@@ -1271,6 +1216,7 @@ out:
         rsp.op_ret    = op_ret;
         rsp.op_errno  = gf_errno_to_error (op_errno);
 
+        req = frame->local;
         server_submit_reply (frame, req, &rsp, NULL, 0, NULL,
                              (xdrproc_t)xdr_gfs3_truncate_rsp);
 
@@ -1284,17 +1230,15 @@ server_fstat_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                   int32_t op_ret, int32_t op_errno, struct iatt *stbuf,
                   dict_t *xdata)
 {
-        gfs3_fstat_rsp    rsp   = {0,};
-        server_state_t   *state = NULL;
-        rpcsvc_request_t *req   = NULL;
-
-        req = frame->local;
-        state = CALL_STATE(frame);
+        gfs3_fstat_rsp       rsp   = {0,};
+        server_state_t      *state = NULL;
+        rpcsvc_request_t    *req   = NULL;
 
-        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, (&rsp.xdata.xdata_val),
+        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, &rsp.xdata.xdata_val,
                                     rsp.xdata.xdata_len, op_errno, out);
 
         if (op_ret) {
+                state = CALL_STATE (frame);
                 gf_log (this->name, GF_LOG_INFO,
                         "%"PRId64": FSTAT %"PRId64" (%s) ==> (%s)",
                         frame->root->unique, state->resolve.fd_no,
@@ -1308,6 +1252,7 @@ out:
         rsp.op_ret    = op_ret;
         rsp.op_errno  = gf_errno_to_error (op_errno);
 
+        req = frame->local;
         server_submit_reply (frame, req, &rsp, NULL, 0, NULL,
                              (xdrproc_t)xdr_gfs3_fstat_rsp);
 
@@ -1321,17 +1266,15 @@ server_ftruncate_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                       int32_t op_ret, int32_t op_errno, struct iatt *prebuf,
                       struct iatt *postbuf, dict_t *xdata)
 {
-        gfs3_ftruncate_rsp  rsp   = {0};
-        server_state_t     *state = NULL;
-        rpcsvc_request_t   *req   = NULL;
-
-        req = frame->local;
-        state = CALL_STATE (frame);
+        gfs3_ftruncate_rsp   rsp   = {0};
+        server_state_t      *state = NULL;
+        rpcsvc_request_t    *req   = NULL;
 
-        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, (&rsp.xdata.xdata_val),
+        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, &rsp.xdata.xdata_val,
                                     rsp.xdata.xdata_len, op_errno, out);
 
         if (op_ret) {
+                state = CALL_STATE (frame);
                 gf_log (this->name, GF_LOG_INFO,
                         "%"PRId64": FTRUNCATE %"PRId64" (%s)==> (%s)",
                         frame->root->unique, state->resolve.fd_no,
@@ -1346,6 +1289,7 @@ out:
         rsp.op_ret    = op_ret;
         rsp.op_errno  = gf_errno_to_error (op_errno);
 
+        req = frame->local;
         server_submit_reply (frame, req, &rsp, NULL, 0, NULL,
                              (xdrproc_t)xdr_gfs3_ftruncate_rsp);
 
@@ -1358,21 +1302,20 @@ int
 server_flush_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                   int32_t op_ret, int32_t op_errno, dict_t *xdata)
 {
-        gf_common_rsp     rsp   = {0,};
-        server_state_t   *state = NULL;
-        rpcsvc_request_t *req   = NULL;
-
-        req = frame->local;
-        state = CALL_STATE(frame);
+        gf_common_rsp        rsp   = {0,};
+        server_state_t      *state = NULL;
+        rpcsvc_request_t    *req   = NULL;
 
-        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, (&rsp.xdata.xdata_val),
+        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, &rsp.xdata.xdata_val,
                                     rsp.xdata.xdata_len, op_errno, out);
 
         if (op_ret < 0) {
-                gf_log (this->name, GF_LOG_INFO,
-                        "%"PRId64": FLUSH %"PRId64" (%s) ==>  (%s)",
+                state = CALL_STATE (frame);
+                gf_log (this->name, (op_errno == ENOENT)?
+                        GF_LOG_DEBUG:GF_LOG_ERROR,
+                        "%"PRId64": FLUSH %"PRId64" (%s) ==> (%s)",
                         frame->root->unique, state->resolve.fd_no,
-                         uuid_utoa (state->resolve.gfid), strerror (op_errno));
+                        uuid_utoa (state->resolve.gfid), strerror (op_errno));
                 goto out;
         }
 
@@ -1380,6 +1323,7 @@ out:
         rsp.op_ret    = op_ret;
         rsp.op_errno  = gf_errno_to_error (op_errno);
 
+        req = frame->local;
         server_submit_reply (frame, req, &rsp, NULL, 0, NULL,
                              (xdrproc_t)xdr_gf_common_rsp);
 
@@ -1393,17 +1337,15 @@ server_fsync_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                   int32_t op_ret, int32_t op_errno, struct iatt *prebuf,
                   struct iatt *postbuf, dict_t *xdata)
 {
-        gfs3_fsync_rsp    rsp   = {0,};
-        server_state_t   *state = NULL;
-        rpcsvc_request_t *req   = NULL;
-
-        req = frame->local;
-        state = CALL_STATE(frame);
+        gfs3_fsync_rsp       rsp   = {0,};
+        server_state_t      *state = NULL;
+        rpcsvc_request_t    *req   = NULL;
 
-        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, (&rsp.xdata.xdata_val),
+        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, &rsp.xdata.xdata_val,
                                     rsp.xdata.xdata_len, op_errno, out);
 
         if (op_ret < 0) {
+                state = CALL_STATE (frame);
                 gf_log (this->name, GF_LOG_INFO,
                         "%"PRId64": FSYNC %"PRId64" (%s) ==> (%s)",
                         frame->root->unique, state->resolve.fd_no,
@@ -1418,6 +1360,7 @@ out:
         rsp.op_ret    = op_ret;
         rsp.op_errno  = gf_errno_to_error (op_errno);
 
+        req = frame->local;
         server_submit_reply (frame, req, &rsp, NULL, 0, NULL,
                              (xdrproc_t)xdr_gfs3_fsync_rsp);
 
@@ -1431,17 +1374,15 @@ server_writev_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                    int32_t op_ret, int32_t op_errno, struct iatt *prebuf,
                    struct iatt *postbuf, dict_t *xdata)
 {
-        gfs3_write_rsp    rsp   = {0,};
-        server_state_t   *state = NULL;
-        rpcsvc_request_t *req   = NULL;
-
-        req = frame->local;
-        state = CALL_STATE(frame);
+        gfs3_write_rsp       rsp   = {0,};
+        server_state_t      *state = NULL;
+        rpcsvc_request_t    *req   = NULL;
 
-        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, (&rsp.xdata.xdata_val),
+        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, &rsp.xdata.xdata_val,
                                     rsp.xdata.xdata_len, op_errno, out);
 
         if (op_ret < 0) {
+                state = CALL_STATE (frame);
                 gf_log (this->name, GF_LOG_INFO,
                         "%"PRId64": WRITEV %"PRId64" (%s) ==> (%s)",
                         frame->root->unique, state->resolve.fd_no,
@@ -1456,6 +1397,7 @@ out:
         rsp.op_ret    = op_ret;
         rsp.op_errno  = gf_errno_to_error (op_errno);
 
+        req = frame->local;
         server_submit_reply (frame, req, &rsp, NULL, 0, NULL,
                              (xdrproc_t)xdr_gfs3_write_rsp);
 
@@ -1471,12 +1413,9 @@ server_readv_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                   struct iovec *vector, int32_t count,
                   struct iatt *stbuf, struct iobref *iobref, dict_t *xdata)
 {
-        gfs3_read_rsp     rsp   = {0,};
-        server_state_t   *state = NULL;
-        rpcsvc_request_t *req   = NULL;
-
-        req = frame->local;
-        state = CALL_STATE(frame);
+        gfs3_read_rsp        rsp   = {0,};
+        server_state_t      *state = NULL;
+        rpcsvc_request_t    *req   = NULL;
 
 #ifdef GF_TESTING_IO_XDATA
         {
@@ -1488,10 +1427,11 @@ server_readv_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                                        "testing-xdata-value");
         }
 #endif
-        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, (&rsp.xdata.xdata_val),
+        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, &rsp.xdata.xdata_val,
                                     rsp.xdata.xdata_len, op_errno, out);
 
         if (op_ret < 0) {
+                state = CALL_STATE (frame);
                 gf_log (this->name, GF_LOG_INFO,
                         "%"PRId64": READV %"PRId64" (%s) ==> (%s)",
                         frame->root->unique, state->resolve.fd_no,
@@ -1506,6 +1446,7 @@ out:
         rsp.op_ret    = op_ret;
         rsp.op_errno  = gf_errno_to_error (op_errno);
 
+        req = frame->local;
         server_submit_reply (frame, req, &rsp, vector, count, iobref,
                              (xdrproc_t)xdr_gfs3_read_rsp);
 
@@ -1520,17 +1461,15 @@ server_rchecksum_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                       uint32_t weak_checksum, uint8_t *strong_checksum,
                       dict_t *xdata)
 {
-        gfs3_rchecksum_rsp  rsp = {0,};
-        rpcsvc_request_t   *req = NULL;
+        gfs3_rchecksum_rsp   rsp   = {0,};
+        rpcsvc_request_t    *req   = NULL;
         server_state_t      *state = NULL;
 
-        req = frame->local;
-        state = CALL_STATE(frame);
-
-        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, (&rsp.xdata.xdata_val),
+        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, &rsp.xdata.xdata_val,
                                     rsp.xdata.xdata_len, op_errno, out);
 
         if (op_ret < 0) {
+                state = CALL_STATE (frame);
                 gf_log (this->name, GF_LOG_INFO,
                         "%"PRId64": RCHECKSUM %"PRId64" (%s)==> (%s)",
                         frame->root->unique, state->resolve.fd_no,
@@ -1547,6 +1486,7 @@ out:
         rsp.op_ret    = op_ret;
         rsp.op_errno  = gf_errno_to_error (op_errno);
 
+        req = frame->local;
         server_submit_reply (frame, req, &rsp, NULL, 0, NULL,
                              (xdrproc_t)xdr_gfs3_rchecksum_rsp);
 
@@ -1560,21 +1500,19 @@ int
 server_open_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                  int32_t op_ret, int32_t op_errno, fd_t *fd, dict_t *xdata)
 {
-        server_connection_t *conn  = NULL;
-        server_state_t      *state = NULL;
-        rpcsvc_request_t    *req   = NULL;
-        uint64_t             fd_no = 0;
-        gfs3_open_rsp        rsp   = {0,};
-
-        req = frame->local;
-        conn = SERVER_CONNECTION (frame);
-        state = CALL_STATE (frame);
+        server_state_t      *state    = NULL;
+        server_ctx_t        *serv_ctx = NULL;
+        rpcsvc_request_t    *req      = NULL;
+        uint64_t             fd_no    = 0;
+        gfs3_open_rsp        rsp      = {0,};
 
-        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, (&rsp.xdata.xdata_val),
+        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, &rsp.xdata.xdata_val,
                                     rsp.xdata.xdata_len, op_errno, out);
 
         if (op_ret < 0) {
-                gf_log (this->name, GF_LOG_INFO,
+                state = CALL_STATE (frame);
+                gf_log (this->name, (op_errno == ENOENT)?
+                        GF_LOG_DEBUG:GF_LOG_ERROR,
                         "%"PRId64": OPEN %s (%s) ==> (%s)",
                         frame->root->unique, state->loc.path,
                         uuid_utoa (state->resolve.gfid),
@@ -1582,8 +1520,14 @@ server_open_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                 goto out;
         }
 
+        serv_ctx = server_ctx_get (frame->root->client, this);
+        if (serv_ctx == NULL) {
+                gf_log (this->name, GF_LOG_INFO, "server_ctx_get() failed");
+                goto out;
+        }
+
         fd_bind (fd);
-        fd_no = gf_fd_unused_get (conn->fdtable, fd);
+        fd_no = gf_fd_unused_get (serv_ctx->fdtable, fd);
         fd_ref (fd);
         rsp.fd = fd_no;
 
@@ -1591,6 +1535,7 @@ out:
         rsp.op_ret    = op_ret;
         rsp.op_errno  = gf_errno_to_error (op_errno);
 
+        req = frame->local;
         server_submit_reply (frame, req, &rsp, NULL, 0, NULL,
                              (xdrproc_t)xdr_gfs3_open_rsp);
         GF_FREE (rsp.xdata.xdata_val);
@@ -1605,20 +1550,18 @@ server_create_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                    struct iatt *stbuf, struct iatt *preparent,
                    struct iatt *postparent, dict_t *xdata)
 {
-        server_connection_t *conn       = NULL;
         server_state_t      *state      = NULL;
+        server_ctx_t        *serv_ctx   = NULL;
         inode_t             *link_inode = NULL;
         rpcsvc_request_t    *req        = NULL;
         uint64_t             fd_no      = 0;
         gfs3_create_rsp      rsp        = {0,};
 
-        req = frame->local;
-        conn = SERVER_CONNECTION (frame);
-        state = CALL_STATE (frame);
-
-        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, (&rsp.xdata.xdata_val),
+        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, &rsp.xdata.xdata_val,
                                     rsp.xdata.xdata_len, op_errno, out);
 
+        state = CALL_STATE (frame);
+
         if (op_ret < 0) {
                 gf_log (this->name, GF_LOG_INFO,
                         "%"PRId64": CREATE %s (%s/%s) ==> (%s)",
@@ -1629,7 +1572,7 @@ server_create_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
         }
 
         /* TODO: log gfid too */
-        gf_log (state->conn->bound_xl->name, GF_LOG_TRACE,
+        gf_log (frame->root->client->bound_xl->name, GF_LOG_TRACE,
                 "%"PRId64": CREATE %s (%s)",
                 frame->root->unique, state->loc.name,
                 uuid_utoa (stbuf->ia_gfid));
@@ -1656,9 +1599,14 @@ server_create_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
         inode_lookup (link_inode);
         inode_unref (link_inode);
 
-        fd_bind (fd);
+        serv_ctx = server_ctx_get (frame->root->client, this);
+        if (serv_ctx == NULL) {
+                gf_log (this->name, GF_LOG_INFO, "server_ctx_get() failed");
+                goto out;
+        }
 
-        fd_no = gf_fd_unused_get (conn->fdtable, fd);
+        fd_bind (fd);
+        fd_no = gf_fd_unused_get (serv_ctx->fdtable, fd);
         fd_ref (fd);
 
         if ((fd_no < 0) || (fd == 0)) {
@@ -1675,6 +1623,7 @@ out:
         rsp.op_ret    = op_ret;
         rsp.op_errno  = gf_errno_to_error (op_errno);
 
+        req = frame->local;
         server_submit_reply (frame, req, &rsp, NULL, 0, NULL,
                              (xdrproc_t)xdr_gfs3_create_rsp);
 
@@ -1688,17 +1637,15 @@ server_readlink_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                      int32_t op_ret, int32_t op_errno, const char *buf,
                      struct iatt *stbuf, dict_t *xdata)
 {
-        gfs3_readlink_rsp  rsp   = {0,};
-        server_state_t    *state = NULL;
-        rpcsvc_request_t  *req   = NULL;
-
-        req = frame->local;
-        state = CALL_STATE(frame);
+        gfs3_readlink_rsp    rsp   = {0,};
+        server_state_t      *state = NULL;
+        rpcsvc_request_t    *req   = NULL;
 
-        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, (&rsp.xdata.xdata_val),
+        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, &rsp.xdata.xdata_val,
                                     rsp.xdata.xdata_len, op_errno, out);
 
         if (op_ret < 0) {
+                state = CALL_STATE (frame);
                 gf_log (this->name, GF_LOG_INFO,
                         "%"PRId64": READLINK %s (%s) ==> (%s)",
                         frame->root->unique, state->loc.path,
@@ -1717,6 +1664,7 @@ out:
         if (!rsp.path)
                 rsp.path = "";
 
+        req = frame->local;
         server_submit_reply (frame, req, &rsp, NULL, 0, NULL,
                              (xdrproc_t)xdr_gfs3_readlink_rsp);
 
@@ -1730,18 +1678,17 @@ server_stat_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                  int32_t op_ret, int32_t op_errno, struct iatt *stbuf,
                  dict_t *xdata)
 {
-        gfs3_stat_rsp     rsp   = {0,};
-        server_state_t   *state = NULL;
-        rpcsvc_request_t *req   = NULL;
-
-        req = frame->local;
-        state  = CALL_STATE (frame);
+        gfs3_stat_rsp        rsp   = {0,};
+        server_state_t      *state = NULL;
+        rpcsvc_request_t    *req   = NULL;
 
-        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, (&rsp.xdata.xdata_val),
+        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, &rsp.xdata.xdata_val,
                                     rsp.xdata.xdata_len, op_errno, out);
 
         if (op_ret) {
-                gf_log (this->name, GF_LOG_INFO,
+                state  = CALL_STATE (frame);
+                gf_log (this->name, (op_errno == ENOENT)?
+                        GF_LOG_DEBUG:GF_LOG_ERROR,
                         "%"PRId64": STAT %s (%s) ==> (%s)",
                         frame->root->unique, state->loc.path,
                         uuid_utoa (state->resolve.gfid),
@@ -1755,6 +1702,7 @@ out:
         rsp.op_ret    = op_ret;
         rsp.op_errno  = gf_errno_to_error (op_errno);
 
+        req = frame->local;
         server_submit_reply (frame, req, &rsp, NULL, 0, NULL,
                              (xdrproc_t)xdr_gfs3_stat_rsp);
 
@@ -1769,17 +1717,15 @@ server_setattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                     int32_t op_ret, int32_t op_errno,
                     struct iatt *statpre, struct iatt *statpost, dict_t *xdata)
 {
-        gfs3_setattr_rsp  rsp   = {0,};
-        server_state_t   *state = NULL;
-        rpcsvc_request_t *req   = NULL;
-
-        req = frame->local;
-        state = CALL_STATE (frame);
+        gfs3_setattr_rsp     rsp   = {0,};
+        server_state_t      *state = NULL;
+        rpcsvc_request_t    *req   = NULL;
 
-        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, (&rsp.xdata.xdata_val),
+        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, &rsp.xdata.xdata_val,
                                     rsp.xdata.xdata_len, op_errno, out);
 
         if (op_ret) {
+                state = CALL_STATE (frame);
                 gf_log (this->name, GF_LOG_INFO,
                         "%"PRId64": SETATTR %s (%s) ==> (%s)",
                         frame->root->unique, state->loc.path,
@@ -1795,6 +1741,7 @@ out:
         rsp.op_ret    = op_ret;
         rsp.op_errno  = gf_errno_to_error (op_errno);
 
+        req = frame->local;
         server_submit_reply (frame, req, &rsp, NULL, 0, NULL,
                              (xdrproc_t)xdr_gfs3_setattr_rsp);
 
@@ -1808,17 +1755,15 @@ server_fsetattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                      int32_t op_ret, int32_t op_errno,
                      struct iatt *statpre, struct iatt *statpost, dict_t *xdata)
 {
-        gfs3_fsetattr_rsp  rsp   = {0,};
-        server_state_t    *state = NULL;
-        rpcsvc_request_t  *req   = NULL;
-
-        req = frame->local;
-        state  = CALL_STATE (frame);
+        gfs3_fsetattr_rsp    rsp   = {0,};
+        server_state_t      *state = NULL;
+        rpcsvc_request_t    *req   = NULL;
 
-        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, (&rsp.xdata.xdata_val),
+        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, &rsp.xdata.xdata_val,
                                     rsp.xdata.xdata_len, op_errno, out);
 
         if (op_ret) {
+                state  = CALL_STATE (frame);
                 gf_log (this->name, GF_LOG_INFO,
                         "%"PRId64": FSETATTR %"PRId64" (%s) ==> (%s)",
                         frame->root->unique, state->resolve.fd_no,
@@ -1834,6 +1779,7 @@ out:
         rsp.op_ret    = op_ret;
         rsp.op_errno  = gf_errno_to_error (op_errno);
 
+        req = frame->local;
         server_submit_reply (frame, req, &rsp, NULL, 0, NULL,
                              (xdrproc_t)xdr_gfs3_fsetattr_rsp);
 
@@ -1848,17 +1794,15 @@ server_xattrop_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                     int32_t op_ret, int32_t op_errno, dict_t *dict,
                     dict_t *xdata)
 {
-        gfs3_xattrop_rsp  rsp   = {0,};
-        server_state_t   *state = NULL;
-        rpcsvc_request_t *req   = NULL;
-
-        req = frame->local;
-        state = CALL_STATE (frame);
+        gfs3_xattrop_rsp     rsp   = {0,};
+        server_state_t      *state = NULL;
+        rpcsvc_request_t    *req   = NULL;
 
-        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, (&rsp.xdata.xdata_val),
+        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, &rsp.xdata.xdata_val,
                                     rsp.xdata.xdata_len, op_errno, out);
 
         if (op_ret < 0) {
+                state = CALL_STATE (frame);
                 gf_log (this->name, GF_LOG_INFO,
                         "%"PRId64": XATTROP %s (%s) ==> (%s)",
                         frame->root->unique, state->loc.path,
@@ -1867,13 +1811,14 @@ server_xattrop_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                 goto out;
         }
 
-        GF_PROTOCOL_DICT_SERIALIZE (this, dict, (&rsp.dict.dict_val),
+        GF_PROTOCOL_DICT_SERIALIZE (this, dict, &rsp.dict.dict_val,
                                     rsp.dict.dict_len, op_errno, out);
 
 out:
         rsp.op_ret        = op_ret;
         rsp.op_errno      = gf_errno_to_error (op_errno);
 
+        req = frame->local;
         server_submit_reply (frame, req, &rsp, NULL, 0, NULL,
                              (xdrproc_t)xdr_gfs3_xattrop_rsp);
 
@@ -1890,17 +1835,15 @@ server_fxattrop_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                      int32_t op_ret, int32_t op_errno, dict_t *dict,
                      dict_t *xdata)
 {
-        gfs3_xattrop_rsp  rsp   = {0,};
-        server_state_t   *state = NULL;
-        rpcsvc_request_t *req   = NULL;
-
-        req = frame->local;
-        state = CALL_STATE(frame);
+        gfs3_xattrop_rsp     rsp   = {0,};
+        server_state_t      *state = NULL;
+        rpcsvc_request_t    *req   = NULL;
 
-        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, (&rsp.xdata.xdata_val),
+        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, &rsp.xdata.xdata_val,
                                     rsp.xdata.xdata_len, op_errno, out);
 
         if (op_ret < 0) {
+                state = CALL_STATE (frame);
                 gf_log (this->name, GF_LOG_INFO,
                         "%"PRId64": FXATTROP %"PRId64" (%s) ==> (%s)",
                         frame->root->unique, state->resolve.fd_no,
@@ -1909,13 +1852,14 @@ server_fxattrop_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                 goto out;
         }
 
-        GF_PROTOCOL_DICT_SERIALIZE (this, dict, (&rsp.dict.dict_val),
+        GF_PROTOCOL_DICT_SERIALIZE (this, dict, &rsp.dict.dict_val,
                                     rsp.dict.dict_len, op_errno, out);
 
 out:
         rsp.op_ret        = op_ret;
         rsp.op_errno      = gf_errno_to_error (op_errno);
 
+        req = frame->local;
         server_submit_reply (frame, req, &rsp, NULL, 0, NULL,
                              (xdrproc_t)xdr_gfs3_fxattrop_rsp);
 
@@ -1929,20 +1873,19 @@ out:
 
 int
 server_readdirp_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
-                     int32_t op_ret, int32_t op_errno, gf_dirent_t *entries, dict_t *xdata)
+                     int32_t op_ret, int32_t op_errno, gf_dirent_t *entries,
+                     dict_t *xdata)
 {
-        gfs3_readdirp_rsp  rsp   = {0,};
-        server_state_t    *state = NULL;
-        rpcsvc_request_t  *req   = NULL;
-        int                ret   = 0;
-
-        req = frame->local;
-        state = CALL_STATE(frame);
+        gfs3_readdirp_rsp    rsp   = {0,};
+        server_state_t      *state = NULL;
+        rpcsvc_request_t    *req   = NULL;
+        int                  ret   = 0;
 
-        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, (&rsp.xdata.xdata_val),
+        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, &rsp.xdata.xdata_val,
                                     rsp.xdata.xdata_len, op_errno, out);
 
         if (op_ret < 0) {
+                state = CALL_STATE (frame);
                 gf_log (this->name, GF_LOG_INFO,
                         "%"PRId64": READDIRP %"PRId64" (%s) ==> (%s)",
                         frame->root->unique, state->resolve.fd_no,
@@ -1968,6 +1911,7 @@ out:
         rsp.op_ret    = op_ret;
         rsp.op_errno  = gf_errno_to_error (op_errno);
 
+        req = frame->local;
         server_submit_reply (frame, req, &rsp, NULL, 0, NULL,
                              (xdrproc_t)xdr_gfs3_readdirp_rsp);
 
@@ -1978,6 +1922,122 @@ out:
         return 0;
 }
 
+int
+server_fallocate_cbk(call_frame_t *frame, void *cookie, xlator_t *this,
+                     int32_t op_ret, int32_t op_errno,
+                     struct iatt *statpre, struct iatt *statpost, dict_t *xdata)
+{
+        gfs3_fallocate_rsp rsp   = {0,};
+        server_state_t    *state = NULL;
+        rpcsvc_request_t  *req   = NULL;
+
+        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, &rsp.xdata.xdata_val,
+                                    rsp.xdata.xdata_len, op_errno, out);
+
+        if (op_ret) {
+                state  = CALL_STATE (frame);
+                gf_log (this->name, GF_LOG_INFO,
+                        "%"PRId64": FALLOCATE %"PRId64" (%s) ==> (%s)",
+                        frame->root->unique, state->resolve.fd_no,
+                        uuid_utoa (state->resolve.gfid),
+                        strerror (op_errno));
+                goto out;
+        }
+
+        gf_stat_from_iatt (&rsp.statpre, statpre);
+        gf_stat_from_iatt (&rsp.statpost, statpost);
+
+out:
+        rsp.op_ret    = op_ret;
+        rsp.op_errno  = gf_errno_to_error (op_errno);
+
+        req = frame->local;
+        server_submit_reply(frame, req, &rsp, NULL, 0, NULL,
+                            (xdrproc_t) xdr_gfs3_fallocate_rsp);
+
+        GF_FREE (rsp.xdata.xdata_val);
+
+        return 0;
+}
+
+int
+server_discard_cbk(call_frame_t *frame, void *cookie, xlator_t *this,
+                   int32_t op_ret, int32_t op_errno,
+                   struct iatt *statpre, struct iatt *statpost, dict_t *xdata)
+{
+        gfs3_discard_rsp rsp     = {0,};
+        server_state_t    *state = NULL;
+        rpcsvc_request_t  *req   = NULL;
+
+        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, &rsp.xdata.xdata_val,
+                                    rsp.xdata.xdata_len, op_errno, out);
+
+        if (op_ret) {
+                state  = CALL_STATE (frame);
+                gf_log (this->name, GF_LOG_INFO,
+                        "%"PRId64": DISCARD %"PRId64" (%s) ==> (%s)",
+                        frame->root->unique, state->resolve.fd_no,
+                        uuid_utoa (state->resolve.gfid),
+                        strerror (op_errno));
+                goto out;
+        }
+
+        gf_stat_from_iatt (&rsp.statpre, statpre);
+        gf_stat_from_iatt (&rsp.statpost, statpost);
+
+out:
+        rsp.op_ret    = op_ret;
+        rsp.op_errno  = gf_errno_to_error (op_errno);
+
+        req = frame->local;
+        server_submit_reply(frame, req, &rsp, NULL, 0, NULL,
+                            (xdrproc_t) xdr_gfs3_discard_rsp);
+
+        GF_FREE (rsp.xdata.xdata_val);
+
+        return 0;
+}
+
+int
+server_zerofill_cbk(call_frame_t *frame, void *cookie, xlator_t *this,
+                   int32_t op_ret, int32_t op_errno,
+                   struct iatt *statpre, struct iatt *statpost, dict_t *xdata)
+{
+        gfs3_zerofill_rsp  rsp    = {0,};
+        server_state_t    *state  = NULL;
+        rpcsvc_request_t  *req    = NULL;
+
+        req = frame->local;
+        state  = CALL_STATE (frame);
+
+        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, (&rsp.xdata.xdata_val),
+                                    rsp.xdata.xdata_len, op_errno, out);
+
+        if (op_ret) {
+                gf_log (this->name, GF_LOG_INFO,
+                        "%"PRId64": ZEROFILL%"PRId64" (%s) ==> (%s)",
+                        frame->root->unique, state->resolve.fd_no,
+                        uuid_utoa (state->resolve.gfid),
+                        strerror (op_errno));
+                goto out;
+        }
+
+        gf_stat_from_iatt (&rsp.statpre, statpre);
+        gf_stat_from_iatt (&rsp.statpost, statpost);
+
+out:
+        rsp.op_ret    = op_ret;
+        rsp.op_errno  = gf_errno_to_error (op_errno);
+
+        server_submit_reply(frame, req, &rsp, NULL, 0, NULL,
+                            (xdrproc_t) xdr_gfs3_zerofill_rsp);
+
+        GF_FREE (rsp.xdata.xdata_val);
+
+        return 0;
+}
+
+
 /* Resume function section */
 
 int
@@ -2141,6 +2201,7 @@ err:
 int
 server_fentrylk_resume (call_frame_t *frame, xlator_t *bound_xl)
 {
+        GF_UNUSED  int  ret   = -1;
         server_state_t *state = NULL;
 
         state = CALL_STATE (frame);
@@ -2148,6 +2209,13 @@ server_fentrylk_resume (call_frame_t *frame, xlator_t *bound_xl)
         if (state->resolve.op_ret != 0)
                 goto err;
 
+        if (!state->xdata)
+                state->xdata = dict_new ();
+
+        if (state->xdata)
+                ret = dict_set_str (state->xdata, "connection-id",
+                                    frame->root->client->client_uid);
+
         STACK_WIND (frame, server_fentrylk_cbk, bound_xl,
                     bound_xl->fops->fentrylk,
                     state->volume, state->fd, state->name,
@@ -2164,6 +2232,7 @@ err:
 int
 server_entrylk_resume (call_frame_t *frame, xlator_t *bound_xl)
 {
+        GF_UNUSED int   ret   = -1;
         server_state_t *state = NULL;
 
         state = CALL_STATE (frame);
@@ -2171,6 +2240,13 @@ server_entrylk_resume (call_frame_t *frame, xlator_t *bound_xl)
         if (state->resolve.op_ret != 0)
                 goto err;
 
+        if (!state->xdata)
+                state->xdata = dict_new ();
+
+        if (state->xdata)
+                ret = dict_set_str (state->xdata, "connection-id",
+                                    frame->root->client->client_uid);
+
         STACK_WIND (frame, server_entrylk_cbk,
                     bound_xl, bound_xl->fops->entrylk,
                     state->volume, &state->loc, state->name,
@@ -2186,13 +2262,24 @@ err:
 int
 server_finodelk_resume (call_frame_t *frame, xlator_t *bound_xl)
 {
+        GF_UNUSED int   ret   = -1;
         server_state_t *state = NULL;
 
+        gf_log (bound_xl->name, GF_LOG_WARNING, "frame %p, xlator %p",
+                frame, bound_xl);
+
         state = CALL_STATE (frame);
 
         if (state->resolve.op_ret != 0)
                 goto err;
 
+        if (!state->xdata)
+                state->xdata = dict_new ();
+
+        if (state->xdata)
+                ret = dict_set_str (state->xdata, "connection-id",
+                                    frame->root->client->client_uid);
+
         STACK_WIND (frame, server_finodelk_cbk, bound_xl,
                     bound_xl->fops->finodelk, state->volume, state->fd,
                     state->cmd, &state->flock, state->xdata);
@@ -2208,13 +2295,24 @@ err:
 int
 server_inodelk_resume (call_frame_t *frame, xlator_t *bound_xl)
 {
+        GF_UNUSED int   ret   = -1;
         server_state_t *state = NULL;
 
+        gf_log (bound_xl->name, GF_LOG_WARNING, "frame %p, xlator %p",
+                frame, bound_xl);
+
         state = CALL_STATE (frame);
 
         if (state->resolve.op_ret != 0)
                 goto err;
 
+        if (!state->xdata)
+                state->xdata = dict_new ();
+
+        if (state->xdata)
+                ret = dict_set_str (state->xdata, "connection-id",
+                                    frame->root->client->client_uid);
+
         STACK_WIND (frame, server_inodelk_cbk, bound_xl,
                     bound_xl->fops->inodelk, state->volume, &state->loc,
                     state->cmd, &state->flock, state->xdata);
@@ -2923,6 +3021,69 @@ err:
         return 0;
 }
 
+int
+server_fallocate_resume (call_frame_t *frame, xlator_t *bound_xl)
+{
+        server_state_t *state = NULL;
+
+        state = CALL_STATE (frame);
+
+        if (state->resolve.op_ret != 0)
+                goto err;
+
+        STACK_WIND (frame, server_fallocate_cbk,
+                    bound_xl, bound_xl->fops->fallocate,
+                    state->fd, state->flags, state->offset, state->size,
+                    state->xdata);
+        return 0;
+err:
+        server_fallocate_cbk(frame, NULL, frame->this, state->resolve.op_ret,
+                             state->resolve.op_errno, NULL, NULL, NULL);
+
+        return 0;
+}
+
+int
+server_discard_resume (call_frame_t *frame, xlator_t *bound_xl)
+{
+        server_state_t *state = NULL;
+
+        state = CALL_STATE (frame);
+
+        if (state->resolve.op_ret != 0)
+                goto err;
+
+        STACK_WIND (frame, server_discard_cbk,
+                    bound_xl, bound_xl->fops->discard,
+                    state->fd, state->offset, state->size, state->xdata);
+        return 0;
+err:
+        server_discard_cbk(frame, NULL, frame->this, state->resolve.op_ret,
+                           state->resolve.op_errno, NULL, NULL, NULL);
+
+        return 0;
+}
+
+int
+server_zerofill_resume (call_frame_t *frame, xlator_t *bound_xl)
+{
+        server_state_t *state = NULL;
+
+        state = CALL_STATE (frame);
+
+        if (state->resolve.op_ret != 0)
+                goto err;
+
+        STACK_WIND (frame, server_zerofill_cbk,
+                    bound_xl, bound_xl->fops->zerofill,
+                    state->fd, state->offset, state->size, state->xdata);
+        return 0;
+err:
+        server_zerofill_cbk(frame, NULL, frame->this, state->resolve.op_ret,
+                           state->resolve.op_errno, NULL, NULL, NULL);
+
+        return 0;
+}
 
 
 
@@ -2945,31 +3106,31 @@ server3_3_stat (rpcsvc_request_t *req)
         ret = xdr_to_generic (req->msg[0], &args, (xdrproc_t)xdr_gfs3_stat_req);
         if (ret < 0) {
                 //failed to decode msg;
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
 
         frame = get_frame_from_request (req);
         if (!frame) {
-                // something wrong, mostly insufficient memory
-                req->rpc_err = GARBAGE_ARGS; /* TODO */
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
         frame->root->op = GF_FOP_STAT;
 
         state = CALL_STATE (frame);
-        if (!state->conn->bound_xl) {
+        if (!frame->root->client->bound_xl) {
                 /* auth failure, request on subvolume without setvolume */
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
 
         state->resolve.type  = RESOLVE_MUST;
         memcpy (state->resolve.gfid, args.gfid, 16);
 
-        GF_PROTOCOL_DICT_UNSERIALIZE (state->conn->bound_xl, state->xdata,
-                                      (args.xdata.xdata_val),
-                                      (args.xdata.xdata_len), ret,
+        GF_PROTOCOL_DICT_UNSERIALIZE (frame->root->client->bound_xl,
+                                      state->xdata,
+                                      args.xdata.xdata_val,
+                                      args.xdata.xdata_len, ret,
                                       op_errno, out);
 
 
@@ -2980,7 +3141,7 @@ out:
         free (args.xdata.xdata_val);
 
         if (op_errno)
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
 
         return ret;
 }
@@ -3002,22 +3163,22 @@ server3_3_setattr (rpcsvc_request_t *req)
                               (xdrproc_t)xdr_gfs3_setattr_req);
         if (ret < 0) {
                 //failed to decode msg;
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
 
         frame = get_frame_from_request (req);
         if (!frame) {
                 // something wrong, mostly insufficient memory
-                req->rpc_err = GARBAGE_ARGS; /* TODO */
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
         frame->root->op = GF_FOP_SETATTR;
 
         state = CALL_STATE (frame);
-        if (!state->conn->bound_xl) {
+        if (!frame->root->client->bound_xl) {
                 /* auth failure, request on subvolume without setvolume */
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
 
@@ -3027,9 +3188,10 @@ server3_3_setattr (rpcsvc_request_t *req)
         gf_stat_to_iatt (&args.stbuf, &state->stbuf);
         state->valid = args.valid;
 
-        GF_PROTOCOL_DICT_UNSERIALIZE (state->conn->bound_xl, state->xdata,
-                                      (args.xdata.xdata_val),
-                                      (args.xdata.xdata_len), ret,
+        GF_PROTOCOL_DICT_UNSERIALIZE (frame->root->client->bound_xl,
+                                      state->xdata,
+                                      args.xdata.xdata_val,
+                                      args.xdata.xdata_len, ret,
                                       op_errno, out);
 
         ret = 0;
@@ -3037,7 +3199,7 @@ server3_3_setattr (rpcsvc_request_t *req)
 
 out:
         if (op_errno)
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
 
         free (args.xdata.xdata_val);
 
@@ -3061,22 +3223,21 @@ server3_3_fsetattr (rpcsvc_request_t *req)
                               (xdrproc_t)xdr_gfs3_fsetattr_req);
         if (ret < 0) {
                 //failed to decode msg;
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
 
         frame = get_frame_from_request (req);
         if (!frame) {
-                // something wrong, mostly insufficient memory
-                req->rpc_err = GARBAGE_ARGS; /* TODO */
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
         frame->root->op = GF_FOP_FSETATTR;
 
         state = CALL_STATE (frame);
-        if (!state->conn->bound_xl) {
+        if (!frame->root->client->bound_xl) {
                 /* auth failure, request on subvolume without setvolume */
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
 
@@ -3086,13 +3247,196 @@ server3_3_fsetattr (rpcsvc_request_t *req)
         gf_stat_to_iatt (&args.stbuf, &state->stbuf);
         state->valid = args.valid;
 
-        GF_PROTOCOL_DICT_UNSERIALIZE (state->conn->bound_xl, state->xdata,
+        GF_PROTOCOL_DICT_UNSERIALIZE (frame->root->client->bound_xl,
+                                      state->xdata,
+                                      args.xdata.xdata_val,
+                                      args.xdata.xdata_len, ret,
+                                      op_errno, out);
+
+        ret = 0;
+        resolve_and_resume (frame, server_fsetattr_resume);
+
+out:
+        free (args.xdata.xdata_val);
+
+        if (op_errno)
+                SERVER_REQ_SET_ERROR (req, ret);
+
+        return ret;
+}
+
+int
+server3_3_fallocate(rpcsvc_request_t *req)
+{
+        server_state_t    *state = NULL;
+        call_frame_t      *frame = NULL;
+        gfs3_fallocate_req args  = {{0},};
+        int                ret   = -1;
+        int                op_errno = 0;
+
+        if (!req)
+                return ret;
+
+        ret = xdr_to_generic (req->msg[0], &args,
+                              (xdrproc_t)xdr_gfs3_fallocate_req);
+        if (ret < 0) {
+                //failed to decode msg;
+                SERVER_REQ_SET_ERROR (req, ret);
+                goto out;
+        }
+
+        frame = get_frame_from_request (req);
+        if (!frame) {
+                // something wrong, mostly insufficient memory
+                SERVER_REQ_SET_ERROR (req, ret);
+                goto out;
+        }
+        frame->root->op = GF_FOP_FALLOCATE;
+
+        state = CALL_STATE (frame);
+        if (!frame->root->client->bound_xl) {
+                /* auth failure, request on subvolume without setvolume */
+                SERVER_REQ_SET_ERROR (req, ret);
+                goto out;
+        }
+
+        state->resolve.type   = RESOLVE_MUST;
+        state->resolve.fd_no  = args.fd;
+
+        state->flags = args.flags;
+        state->offset = args.offset;
+        state->size = args.size;
+        memcpy(state->resolve.gfid, args.gfid, 16);
+
+        GF_PROTOCOL_DICT_UNSERIALIZE (frame->root->client->bound_xl,
+                                      state->xdata,
+                                      args.xdata.xdata_val,
+                                      args.xdata.xdata_len, ret,
+                                      op_errno, out);
+
+        ret = 0;
+        resolve_and_resume (frame, server_fallocate_resume);
+
+out:
+        free (args.xdata.xdata_val);
+
+        if (op_errno)
+                SERVER_REQ_SET_ERROR (req, ret);
+
+        return ret;
+}
+
+
+int
+server3_3_discard(rpcsvc_request_t *req)
+{
+        server_state_t    *state = NULL;
+        call_frame_t      *frame = NULL;
+        gfs3_discard_req args    = {{0},};
+        int                ret   = -1;
+        int                op_errno = 0;
+
+        if (!req)
+                return ret;
+
+        ret = xdr_to_generic (req->msg[0], &args,
+                              (xdrproc_t)xdr_gfs3_discard_req);
+        if (ret < 0) {
+                //failed to decode msg;
+                SERVER_REQ_SET_ERROR (req, ret);
+                goto out;
+        }
+
+        frame = get_frame_from_request (req);
+        if (!frame) {
+                // something wrong, mostly insufficient memory
+                SERVER_REQ_SET_ERROR (req, ret);
+                goto out;
+        }
+        frame->root->op = GF_FOP_DISCARD;
+
+        state = CALL_STATE (frame);
+        if (!frame->root->client->bound_xl) {
+                /* auth failure, request on subvolume without setvolume */
+                SERVER_REQ_SET_ERROR (req, ret);
+                goto out;
+        }
+
+        state->resolve.type   = RESOLVE_MUST;
+        state->resolve.fd_no  = args.fd;
+
+        state->offset = args.offset;
+        state->size = args.size;
+        memcpy(state->resolve.gfid, args.gfid, 16);
+
+        GF_PROTOCOL_DICT_UNSERIALIZE (frame->root->client->bound_xl,
+                                      state->xdata,
+                                      args.xdata.xdata_val,
+                                      args.xdata.xdata_len, ret,
+                                      op_errno, out);
+
+        ret = 0;
+        resolve_and_resume (frame, server_discard_resume);
+
+out:
+        free (args.xdata.xdata_val);
+
+        if (op_errno)
+                SERVER_REQ_SET_ERROR (req, ret);
+
+        return ret;
+}
+
+
+int
+server3_3_zerofill(rpcsvc_request_t *req)
+{
+        server_state_t       *state      = NULL;
+        call_frame_t         *frame      = NULL;
+        gfs3_zerofill_req     args       = {{0},};
+        int                   ret        = -1;
+        int                   op_errno   = 0;
+
+        if (!req)
+                return ret;
+
+        ret = xdr_to_generic (req->msg[0], &args,
+                              (xdrproc_t)xdr_gfs3_zerofill_req);
+        if (ret < 0) {
+                /*failed to decode msg*/;
+                req->rpc_err = GARBAGE_ARGS;
+                goto out;
+        }
+
+        frame = get_frame_from_request (req);
+        if (!frame) {
+                /* something wrong, mostly insufficient memory*/
+                req->rpc_err = GARBAGE_ARGS; /* TODO */
+                goto out;
+        }
+        frame->root->op = GF_FOP_ZEROFILL;
+
+        state = CALL_STATE (frame);
+        if (!frame->root->client->bound_xl) {
+                /* auth failure, request on subvolume without setvolume */
+                req->rpc_err = GARBAGE_ARGS;
+                goto out;
+        }
+
+        state->resolve.type   = RESOLVE_MUST;
+        state->resolve.fd_no  = args.fd;
+
+        state->offset = args.offset;
+        state->size = args.size;
+        memcpy(state->resolve.gfid, args.gfid, 16);
+
+        GF_PROTOCOL_DICT_UNSERIALIZE (frame->root->client->bound_xl, state->xdata,
                                       (args.xdata.xdata_val),
                                       (args.xdata.xdata_len), ret,
                                       op_errno, out);
 
         ret = 0;
-        resolve_and_resume (frame, server_fsetattr_resume);
+        resolve_and_resume (frame, server_zerofill_resume);
 
 out:
         free (args.xdata.xdata_val);
@@ -3103,7 +3447,6 @@ out:
         return ret;
 }
 
-
 int
 server3_3_readlink (rpcsvc_request_t *req)
 {
@@ -3120,22 +3463,22 @@ server3_3_readlink (rpcsvc_request_t *req)
                               (xdrproc_t)xdr_gfs3_readlink_req);
         if (ret < 0) {
                 //failed to decode msg;
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
 
         frame = get_frame_from_request (req);
         if (!frame) {
                 // something wrong, mostly insufficient memory
-                req->rpc_err = GARBAGE_ARGS; /* TODO */
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
         frame->root->op = GF_FOP_READLINK;
 
         state = CALL_STATE (frame);
-        if (!state->conn->bound_xl) {
+        if (!frame->root->client->bound_xl) {
                 /* auth failure, request on subvolume without setvolume */
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
 
@@ -3144,9 +3487,10 @@ server3_3_readlink (rpcsvc_request_t *req)
 
         state->size  = args.size;
 
-        GF_PROTOCOL_DICT_UNSERIALIZE (state->conn->bound_xl, state->xdata,
-                                      (args.xdata.xdata_val),
-                                      (args.xdata.xdata_len), ret,
+        GF_PROTOCOL_DICT_UNSERIALIZE (frame->root->client->bound_xl,
+                                      state->xdata,
+                                      args.xdata.xdata_val,
+                                      args.xdata.xdata_len, ret,
                                       op_errno, out);
 
         ret = 0;
@@ -3156,7 +3500,7 @@ out:
         free (args.xdata.xdata_val);
 
         if (op_errno)
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
 
         return ret;
 }
@@ -3180,22 +3524,22 @@ server3_3_create (rpcsvc_request_t *req)
                               (xdrproc_t)xdr_gfs3_create_req);
         if (ret < 0) {
                 //failed to decode msg;
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
 
         frame = get_frame_from_request (req);
         if (!frame) {
                 // something wrong, mostly insufficient memory
-                req->rpc_err = GARBAGE_ARGS; /* TODO */
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
         frame->root->op = GF_FOP_CREATE;
 
         state = CALL_STATE (frame);
-        if (!state->conn->bound_xl) {
+        if (!frame->root->client->bound_xl) {
                 /* auth failure, request on subvolume without setvolume */
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
 
@@ -3213,9 +3557,10 @@ server3_3_create (rpcsvc_request_t *req)
         }
 
         /* TODO: can do alloca for xdata field instead of stdalloc */
-        GF_PROTOCOL_DICT_UNSERIALIZE (state->conn->bound_xl, state->xdata,
-                                      (args.xdata.xdata_val),
-                                      (args.xdata.xdata_len), ret,
+        GF_PROTOCOL_DICT_UNSERIALIZE (frame->root->client->bound_xl,
+                                      state->xdata,
+                                      args.xdata.xdata_val,
+                                      args.xdata.xdata_len, ret,
                                       op_errno, out);
 
         ret = 0;
@@ -3226,7 +3571,7 @@ out:
         free (args.xdata.xdata_val);
 
         if (op_errno)
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
 
         return ret;
 }
@@ -3247,22 +3592,22 @@ server3_3_open (rpcsvc_request_t *req)
         ret = xdr_to_generic (req->msg[0], &args, (xdrproc_t)xdr_gfs3_open_req);
         if (ret < 0) {
                 //failed to decode msg;
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
 
         frame = get_frame_from_request (req);
         if (!frame) {
                 // something wrong, mostly insufficient memory
-                req->rpc_err = GARBAGE_ARGS; /* TODO */
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
         frame->root->op = GF_FOP_OPEN;
 
         state = CALL_STATE (frame);
-        if (!state->conn->bound_xl) {
+        if (!frame->root->client->bound_xl) {
                 /* auth failure, request on subvolume without setvolume */
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
 
@@ -3271,16 +3616,17 @@ server3_3_open (rpcsvc_request_t *req)
 
         state->flags = gf_flags_to_flags (args.flags);
 
-        GF_PROTOCOL_DICT_UNSERIALIZE (state->conn->bound_xl, state->xdata,
-                                      (args.xdata.xdata_val),
-                                      (args.xdata.xdata_len), ret,
+        GF_PROTOCOL_DICT_UNSERIALIZE (frame->root->client->bound_xl,
+                                      state->xdata,
+                                      args.xdata.xdata_val,
+                                      args.xdata.xdata_len, ret,
                                       op_errno, out);
 
         ret = 0;
         resolve_and_resume (frame, server_open_resume);
 out:
         if (op_errno)
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
 
         free (args.xdata.xdata_val);
 
@@ -3303,22 +3649,22 @@ server3_3_readv (rpcsvc_request_t *req)
         ret = xdr_to_generic (req->msg[0], &args, (xdrproc_t)xdr_gfs3_read_req);
         if (ret < 0) {
                 //failed to decode msg;
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
 
         frame = get_frame_from_request (req);
         if (!frame) {
                 // something wrong, mostly insufficient memory
-                req->rpc_err = GARBAGE_ARGS; /* TODO */
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
         frame->root->op = GF_FOP_READ;
 
         state = CALL_STATE (frame);
-        if (!state->conn->bound_xl) {
+        if (!frame->root->client->bound_xl) {
                 /* auth failure, request on subvolume without setvolume */
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
 
@@ -3330,9 +3676,10 @@ server3_3_readv (rpcsvc_request_t *req)
 
         memcpy (state->resolve.gfid, args.gfid, 16);
 
-        GF_PROTOCOL_DICT_UNSERIALIZE (state->conn->bound_xl, state->xdata,
-                                      (args.xdata.xdata_val),
-                                      (args.xdata.xdata_len), ret,
+        GF_PROTOCOL_DICT_UNSERIALIZE (frame->root->client->bound_xl,
+                                      state->xdata,
+                                      args.xdata.xdata_val,
+                                      args.xdata.xdata_len, ret,
                                       op_errno, out);
 
         ret = 0;
@@ -3342,7 +3689,7 @@ out:
         free (args.xdata.xdata_val);
 
         if (op_errno)
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
 
         return ret;
 }
@@ -3366,22 +3713,22 @@ server3_3_writev (rpcsvc_request_t *req)
                               (xdrproc_t)xdr_gfs3_write_req);
         if (len < 0) {
                 //failed to decode msg;
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
 
         frame = get_frame_from_request (req);
         if (!frame) {
                 // something wrong, mostly insufficient memory
-                req->rpc_err = GARBAGE_ARGS; /* TODO */
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
         frame->root->op = GF_FOP_WRITE;
 
         state = CALL_STATE (frame);
-        if (!state->conn->bound_xl) {
+        if (!frame->root->client->bound_xl) {
                 /* auth failure, request on subvolume without setvolume */
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
 
@@ -3409,9 +3756,10 @@ server3_3_writev (rpcsvc_request_t *req)
                 state->size += state->payload_vector[i].iov_len;
         }
 
-        GF_PROTOCOL_DICT_UNSERIALIZE (state->conn->bound_xl, state->xdata,
-                                      (args.xdata.xdata_val),
-                                      (args.xdata.xdata_len), ret,
+        GF_PROTOCOL_DICT_UNSERIALIZE (frame->root->client->bound_xl,
+                                      state->xdata,
+                                      args.xdata.xdata_val,
+                                      args.xdata.xdata_len, ret,
                                       op_errno, out);
 
 #ifdef GF_TESTING_IO_XDATA
@@ -3424,7 +3772,7 @@ out:
         free (args.xdata.xdata_val);
 
         if (op_errno)
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
 
         return ret;
 }
@@ -3490,26 +3838,36 @@ server3_3_writev_vecsizer (int state, ssize_t *readsize, char *base_addr,
 int
 server3_3_release (rpcsvc_request_t *req)
 {
-        server_connection_t *conn = NULL;
-        gfs3_release_req     args = {{0,},};
-        gf_common_rsp        rsp  = {0,};
-        int                  ret  = -1;
+        client_t         *client   = NULL;
+        server_ctx_t     *serv_ctx = NULL;
+        gfs3_release_req  args     = {{0,},};
+        gf_common_rsp     rsp      = {0,};
+        int               ret      = -1;
 
         ret = xdr_to_generic (req->msg[0], &args,
                               (xdrproc_t)xdr_gfs3_release_req);
         if (ret < 0) {
                 //failed to decode msg;
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
 
-        conn = req->trans->xl_private;
-        if (!conn) {
+        client = req->trans->xl_private;
+        if (!client) {
                 /* Handshake is not complete yet. */
                 req->rpc_err = SYSTEM_ERR;
                 goto out;
         }
-        gf_fd_put (conn->fdtable, args.fd);
+
+        serv_ctx = server_ctx_get (client, client->this);
+        if (serv_ctx == NULL) {
+                gf_log (req->trans->name, GF_LOG_INFO,
+                        "server_ctx_get() failed");
+                req->rpc_err = SYSTEM_ERR;
+                goto out;
+        }
+
+        gf_fd_put (serv_ctx->fdtable, args.fd);
 
         server_submit_reply (NULL, req, &rsp, NULL, 0, NULL,
                              (xdrproc_t)xdr_gf_common_rsp);
@@ -3522,26 +3880,35 @@ out:
 int
 server3_3_releasedir (rpcsvc_request_t *req)
 {
-        server_connection_t *conn = NULL;
-        gfs3_releasedir_req  args = {{0,},};
-        gf_common_rsp        rsp  = {0,};
-        int                  ret  = -1;
+        client_t            *client   = NULL;
+        server_ctx_t        *serv_ctx = NULL;
+        gfs3_releasedir_req  args     = {{0,},};
+        gf_common_rsp        rsp      = {0,};
+        int                  ret      = -1;
 
         ret = xdr_to_generic (req->msg[0], &args,
                               (xdrproc_t)xdr_gfs3_release_req);
         if (ret < 0) {
                 //failed to decode msg;
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
 
-        conn = req->trans->xl_private;
-        if (!conn) {
-                req->rpc_err = GARBAGE_ARGS;
+        client = req->trans->xl_private;
+        if (!client) {
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
 
-        gf_fd_put (conn->fdtable, args.fd);
+        serv_ctx = server_ctx_get (client, client->this);
+        if (serv_ctx == NULL) {
+                gf_log (req->trans->name, GF_LOG_INFO,
+                        "server_ctx_get() failed");
+                req->rpc_err = SYSTEM_ERR;
+                goto out;
+        }
+
+        gf_fd_put (serv_ctx->fdtable, args.fd);
 
         server_submit_reply (NULL, req, &rsp, NULL, 0, NULL,
                              (xdrproc_t)xdr_gf_common_rsp);
@@ -3568,22 +3935,22 @@ server3_3_fsync (rpcsvc_request_t *req)
                               (xdrproc_t)xdr_gfs3_fsync_req);
         if (ret < 0) {
                 //failed to decode msg;
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
 
         frame = get_frame_from_request (req);
         if (!frame) {
                 // something wrong, mostly insufficient memory
-                req->rpc_err = GARBAGE_ARGS; /* TODO */
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
         frame->root->op = GF_FOP_FSYNC;
 
         state = CALL_STATE (frame);
-        if (!state->conn->bound_xl) {
+        if (!frame->root->client->bound_xl) {
                 /* auth failure, request on subvolume without setvolume */
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
 
@@ -3592,9 +3959,10 @@ server3_3_fsync (rpcsvc_request_t *req)
         state->flags         = args.data;
         memcpy (state->resolve.gfid, args.gfid, 16);
 
-        GF_PROTOCOL_DICT_UNSERIALIZE (state->conn->bound_xl, state->xdata,
-                                      (args.xdata.xdata_val),
-                                      (args.xdata.xdata_len), ret,
+        GF_PROTOCOL_DICT_UNSERIALIZE (frame->root->client->bound_xl,
+                                      state->xdata,
+                                      args.xdata.xdata_val,
+                                      args.xdata.xdata_len, ret,
                                       op_errno, out);
 
         ret = 0;
@@ -3603,7 +3971,7 @@ out:
         free (args.xdata.xdata_val);
 
         if (op_errno)
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
 
         return ret;
 }
@@ -3626,22 +3994,22 @@ server3_3_flush (rpcsvc_request_t *req)
                               (xdrproc_t)xdr_gfs3_flush_req);
         if (ret < 0) {
                 //failed to decode msg;
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
 
         frame = get_frame_from_request (req);
         if (!frame) {
                 // something wrong, mostly insufficient memory
-                req->rpc_err = GARBAGE_ARGS; /* TODO */
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
         frame->root->op = GF_FOP_FLUSH;
 
         state = CALL_STATE (frame);
-        if (!state->conn->bound_xl) {
+        if (!frame->root->client->bound_xl) {
                 /* auth failure, request on subvolume without setvolume */
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
 
@@ -3649,9 +4017,10 @@ server3_3_flush (rpcsvc_request_t *req)
         state->resolve.fd_no = args.fd;
         memcpy (state->resolve.gfid, args.gfid, 16);
 
-        GF_PROTOCOL_DICT_UNSERIALIZE (state->conn->bound_xl, state->xdata,
-                                      (args.xdata.xdata_val),
-                                      (args.xdata.xdata_len), ret,
+        GF_PROTOCOL_DICT_UNSERIALIZE (frame->root->client->bound_xl,
+                                      state->xdata,
+                                      args.xdata.xdata_val,
+                                      args.xdata.xdata_len, ret,
                                       op_errno, out);
 
         ret = 0;
@@ -3660,7 +4029,7 @@ out:
         free (args.xdata.xdata_val);
 
         if (op_errno)
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
 
         return ret;
 }
@@ -3683,22 +4052,22 @@ server3_3_ftruncate (rpcsvc_request_t *req)
                               (xdrproc_t)xdr_gfs3_ftruncate_req);
         if (ret < 0) {
                 //failed to decode msg;
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
 
         frame = get_frame_from_request (req);
         if (!frame) {
                 // something wrong, mostly insufficient memory
-                req->rpc_err = GARBAGE_ARGS; /* TODO */
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
         frame->root->op = GF_FOP_FTRUNCATE;
 
         state = CALL_STATE (frame);
-        if (!state->conn->bound_xl) {
+        if (!frame->root->client->bound_xl) {
                 /* auth failure, request on subvolume without setvolume */
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
 
@@ -3707,9 +4076,10 @@ server3_3_ftruncate (rpcsvc_request_t *req)
         state->offset         = args.offset;
         memcpy (state->resolve.gfid, args.gfid, 16);
 
-        GF_PROTOCOL_DICT_UNSERIALIZE (state->conn->bound_xl, state->xdata,
-                                      (args.xdata.xdata_val),
-                                      (args.xdata.xdata_len), ret,
+        GF_PROTOCOL_DICT_UNSERIALIZE (frame->root->client->bound_xl,
+                                      state->xdata,
+                                      args.xdata.xdata_val,
+                                      args.xdata.xdata_len, ret,
                                       op_errno, out);
 
         ret = 0;
@@ -3718,7 +4088,7 @@ out:
         free (args.xdata.xdata_val);
 
         if (op_errno)
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
 
         return ret;
 }
@@ -3740,22 +4110,22 @@ server3_3_fstat (rpcsvc_request_t *req)
                               (xdrproc_t)xdr_gfs3_fstat_req);
         if (ret < 0) {
                 //failed to decode msg;
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
 
         frame = get_frame_from_request (req);
         if (!frame) {
                 // something wrong, mostly insufficient memory
-                req->rpc_err = GARBAGE_ARGS; /* TODO */
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
         frame->root->op = GF_FOP_FSTAT;
 
         state = CALL_STATE (frame);
-        if (!state->conn->bound_xl) {
+        if (!frame->root->client->bound_xl) {
                 /* auth failure, request on subvolume without setvolume */
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
 
@@ -3763,9 +4133,10 @@ server3_3_fstat (rpcsvc_request_t *req)
         state->resolve.fd_no   = args.fd;
         memcpy (state->resolve.gfid, args.gfid, 16);
 
-        GF_PROTOCOL_DICT_UNSERIALIZE (state->conn->bound_xl, state->xdata,
-                                      (args.xdata.xdata_val),
-                                      (args.xdata.xdata_len), ret,
+        GF_PROTOCOL_DICT_UNSERIALIZE (frame->root->client->bound_xl,
+                                      state->xdata,
+                                      args.xdata.xdata_val,
+                                      args.xdata.xdata_len, ret,
                                       op_errno, out);
 
         ret = 0;
@@ -3774,7 +4145,7 @@ out:
         free (args.xdata.xdata_val);
 
         if (op_errno)
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
 
         return ret;
 }
@@ -3796,22 +4167,22 @@ server3_3_truncate (rpcsvc_request_t *req)
                               (xdrproc_t)xdr_gfs3_truncate_req);
         if (ret < 0) {
                 //failed to decode msg;
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
 
         frame = get_frame_from_request (req);
         if (!frame) {
                 // something wrong, mostly insufficient memory
-                req->rpc_err = GARBAGE_ARGS; /* TODO */
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
         frame->root->op = GF_FOP_TRUNCATE;
 
         state = CALL_STATE (frame);
-        if (!state->conn->bound_xl) {
+        if (!frame->root->client->bound_xl) {
                 /* auth failure, request on subvolume without setvolume */
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
 
@@ -3819,9 +4190,10 @@ server3_3_truncate (rpcsvc_request_t *req)
         memcpy (state->resolve.gfid, args.gfid, 16);
         state->offset        = args.offset;
 
-        GF_PROTOCOL_DICT_UNSERIALIZE (state->conn->bound_xl, state->xdata,
-                                      (args.xdata.xdata_val),
-                                      (args.xdata.xdata_len), ret,
+        GF_PROTOCOL_DICT_UNSERIALIZE (frame->root->client->bound_xl,
+                                      state->xdata,
+                                      args.xdata.xdata_val,
+                                      args.xdata.xdata_len, ret,
                                       op_errno, out);
 
         ret = 0;
@@ -3830,7 +4202,7 @@ out:
         free (args.xdata.xdata_val);
 
         if (op_errno)
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
 
         return ret;
 }
@@ -3855,22 +4227,22 @@ server3_3_unlink (rpcsvc_request_t *req)
                               (xdrproc_t)xdr_gfs3_unlink_req);
         if (ret < 0) {
                 //failed to decode msg;
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
 
         frame = get_frame_from_request (req);
         if (!frame) {
                 // something wrong, mostly insufficient memory
-                req->rpc_err = GARBAGE_ARGS; /* TODO */
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
         frame->root->op = GF_FOP_UNLINK;
 
         state = CALL_STATE (frame);
-        if (!state->conn->bound_xl) {
+        if (!frame->root->client->bound_xl) {
                 /* auth failure, request on subvolume without setvolume */
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
 
@@ -3880,9 +4252,10 @@ server3_3_unlink (rpcsvc_request_t *req)
 
         state->flags = args.xflags;
 
-        GF_PROTOCOL_DICT_UNSERIALIZE (state->conn->bound_xl, state->xdata,
-                                      (args.xdata.xdata_val),
-                                      (args.xdata.xdata_len), ret,
+        GF_PROTOCOL_DICT_UNSERIALIZE (frame->root->client->bound_xl,
+                                      state->xdata,
+                                      args.xdata.xdata_val,
+                                      args.xdata.xdata_len, ret,
                                       op_errno, out);
 
         ret = 0;
@@ -3891,7 +4264,7 @@ out:
         free (args.xdata.xdata_val);
 
         if (op_errno)
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
 
         return ret;
 }
@@ -3916,22 +4289,22 @@ server3_3_setxattr (rpcsvc_request_t *req)
                               (xdrproc_t)xdr_gfs3_setxattr_req);
         if (ret < 0) {
                 //failed to decode msg;
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
 
         frame = get_frame_from_request (req);
         if (!frame) {
                 // something wrong, mostly insufficient memory
-                req->rpc_err = GARBAGE_ARGS; /* TODO */
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
         frame->root->op = GF_FOP_SETXATTR;
 
         state = CALL_STATE (frame);
-        if (!state->conn->bound_xl) {
+        if (!frame->root->client->bound_xl) {
                 /* auth failure, request on subvolume without setvolume */
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
 
@@ -3939,7 +4312,8 @@ server3_3_setxattr (rpcsvc_request_t *req)
         state->flags            = args.flags;
         memcpy (state->resolve.gfid, args.gfid, 16);
 
-        GF_PROTOCOL_DICT_UNSERIALIZE (state->conn->bound_xl, dict,
+        GF_PROTOCOL_DICT_UNSERIALIZE (frame->root->client->bound_xl,
+                                      dict,
                                       (args.dict.dict_val),
                                       (args.dict.dict_len), ret,
                                       op_errno, out);
@@ -3949,9 +4323,10 @@ server3_3_setxattr (rpcsvc_request_t *req)
         /* There can be some commands hidden in key, check and proceed */
         gf_server_check_setxattr_cmd (frame, dict);
 
-        GF_PROTOCOL_DICT_UNSERIALIZE (state->conn->bound_xl, state->xdata,
-                                      (args.xdata.xdata_val),
-                                      (args.xdata.xdata_len), ret,
+        GF_PROTOCOL_DICT_UNSERIALIZE (frame->root->client->bound_xl,
+                                      state->xdata,
+                                      args.xdata.xdata_val,
+                                      args.xdata.xdata_len, ret,
                                       op_errno, out);
 
         ret = 0;
@@ -3962,7 +4337,7 @@ out:
         free (args.xdata.xdata_val);
 
         if (op_errno)
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
 
         if (dict)
                 dict_unref (dict);
@@ -3990,22 +4365,22 @@ server3_3_fsetxattr (rpcsvc_request_t *req)
                               (xdrproc_t)xdr_gfs3_fsetxattr_req);
         if (ret < 0) {
                 //failed to decode msg;
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
 
         frame = get_frame_from_request (req);
         if (!frame) {
                 // something wrong, mostly insufficient memory
-                req->rpc_err = GARBAGE_ARGS; /* TODO */
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
         frame->root->op = GF_FOP_FSETXATTR;
 
         state = CALL_STATE (frame);
-        if (!state->conn->bound_xl) {
+        if (!frame->root->client->bound_xl) {
                 /* auth failure, request on subvolume without setvolume */
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
 
@@ -4014,16 +4389,18 @@ server3_3_fsetxattr (rpcsvc_request_t *req)
         state->flags             = args.flags;
         memcpy (state->resolve.gfid, args.gfid, 16);
 
-        GF_PROTOCOL_DICT_UNSERIALIZE (state->conn->bound_xl, dict,
+        GF_PROTOCOL_DICT_UNSERIALIZE (frame->root->client->bound_xl,
+                                      dict,
                                       (args.dict.dict_val),
                                       (args.dict.dict_len), ret,
                                       op_errno, out);
 
         state->dict = dict;
 
-        GF_PROTOCOL_DICT_UNSERIALIZE (state->conn->bound_xl, state->xdata,
-                                      (args.xdata.xdata_val),
-                                      (args.xdata.xdata_len), ret,
+        GF_PROTOCOL_DICT_UNSERIALIZE (frame->root->client->bound_xl,
+                                      state->xdata,
+                                      args.xdata.xdata_val,
+                                      args.xdata.xdata_len, ret,
                                       op_errno, out);
 
         ret = 0;
@@ -4034,7 +4411,7 @@ out:
         free (args.xdata.xdata_val);
 
         if (op_errno)
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
 
         if (dict)
                 dict_unref (dict);
@@ -4062,22 +4439,22 @@ server3_3_fxattrop (rpcsvc_request_t *req)
                               (xdrproc_t)xdr_gfs3_fxattrop_req);
         if (ret < 0) {
                 //failed to decode msg;
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
 
         frame = get_frame_from_request (req);
         if (!frame) {
                 // something wrong, mostly insufficient memory
-                req->rpc_err = GARBAGE_ARGS; /* TODO */
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
         frame->root->op = GF_FOP_FXATTROP;
 
-        state = CALL_STATE(frame);
-        if (!state->conn->bound_xl) {
+        state = CALL_STATE (frame);
+        if (!frame->root->client->bound_xl) {
                 /* auth failure, request on subvolume without setvolume */
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
 
@@ -4086,16 +4463,18 @@ server3_3_fxattrop (rpcsvc_request_t *req)
         state->flags           = args.flags;
         memcpy (state->resolve.gfid, args.gfid, 16);
 
-        GF_PROTOCOL_DICT_UNSERIALIZE (state->conn->bound_xl, dict,
+        GF_PROTOCOL_DICT_UNSERIALIZE (frame->root->client->bound_xl,
+                                      dict,
                                       (args.dict.dict_val),
                                       (args.dict.dict_len), ret,
                                       op_errno, out);
 
         state->dict = dict;
 
-        GF_PROTOCOL_DICT_UNSERIALIZE (state->conn->bound_xl, state->xdata,
-                                      (args.xdata.xdata_val),
-                                      (args.xdata.xdata_len), ret,
+        GF_PROTOCOL_DICT_UNSERIALIZE (frame->root->client->bound_xl,
+                                      state->xdata,
+                                      args.xdata.xdata_val,
+                                      args.xdata.xdata_len, ret,
                                       op_errno, out);
 
         ret = 0;
@@ -4107,7 +4486,7 @@ out:
         free (args.xdata.xdata_val);
 
         if (op_errno)
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
 
         if (dict)
                 dict_unref (dict);
@@ -4136,22 +4515,22 @@ server3_3_xattrop (rpcsvc_request_t *req)
                               (xdrproc_t)xdr_gfs3_xattrop_req);
         if (ret < 0) {
                 //failed to decode msg;
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
 
         frame = get_frame_from_request (req);
         if (!frame) {
                 // something wrong, mostly insufficient memory
-                req->rpc_err = GARBAGE_ARGS; /* TODO */
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
         frame->root->op = GF_FOP_XATTROP;
 
-        state = CALL_STATE(frame);
-        if (!state->conn->bound_xl) {
+        state = CALL_STATE (frame);
+        if (!frame->root->client->bound_xl) {
                 /* auth failure, request on subvolume without setvolume */
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
 
@@ -4159,16 +4538,18 @@ server3_3_xattrop (rpcsvc_request_t *req)
         state->flags           = args.flags;
         memcpy (state->resolve.gfid, args.gfid, 16);
 
-        GF_PROTOCOL_DICT_UNSERIALIZE (state->conn->bound_xl, dict,
+        GF_PROTOCOL_DICT_UNSERIALIZE (frame->root->client->bound_xl,
+                                      dict,
                                       (args.dict.dict_val),
                                       (args.dict.dict_len), ret,
                                       op_errno, out);
 
         state->dict = dict;
 
-        GF_PROTOCOL_DICT_UNSERIALIZE (state->conn->bound_xl, state->xdata,
-                                      (args.xdata.xdata_val),
-                                      (args.xdata.xdata_len), ret,
+        GF_PROTOCOL_DICT_UNSERIALIZE (frame->root->client->bound_xl,
+                                      state->xdata,
+                                      args.xdata.xdata_val,
+                                      args.xdata.xdata_len, ret,
                                       op_errno, out);
 
         ret = 0;
@@ -4179,7 +4560,7 @@ out:
         free (args.xdata.xdata_val);
 
         if (op_errno)
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
 
         if (dict)
                 dict_unref (dict);
@@ -4206,22 +4587,22 @@ server3_3_getxattr (rpcsvc_request_t *req)
                               (xdrproc_t)xdr_gfs3_getxattr_req);
         if (ret < 0) {
                 //failed to decode msg;
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
 
         frame = get_frame_from_request (req);
         if (!frame) {
                 // something wrong, mostly insufficient memory
-                req->rpc_err = GARBAGE_ARGS; /* TODO */
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
         frame->root->op = GF_FOP_GETXATTR;
 
         state = CALL_STATE (frame);
-        if (!state->conn->bound_xl) {
+        if (!frame->root->client->bound_xl) {
                 /* auth failure, request on subvolume without setvolume */
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
 
@@ -4234,9 +4615,10 @@ server3_3_getxattr (rpcsvc_request_t *req)
                 gf_server_check_getxattr_cmd (frame, state->name);
         }
 
-        GF_PROTOCOL_DICT_UNSERIALIZE (state->conn->bound_xl, state->xdata,
-                                      (args.xdata.xdata_val),
-                                      (args.xdata.xdata_len), ret,
+        GF_PROTOCOL_DICT_UNSERIALIZE (frame->root->client->bound_xl,
+                                      state->xdata,
+                                      args.xdata.xdata_val,
+                                      args.xdata.xdata_len, ret,
                                       op_errno, out);
 
         ret = 0;
@@ -4245,7 +4627,7 @@ out:
         free (args.xdata.xdata_val);
 
         if (op_errno)
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
 
         return ret;
 }
@@ -4268,22 +4650,22 @@ server3_3_fgetxattr (rpcsvc_request_t *req)
                               (xdrproc_t)xdr_gfs3_fgetxattr_req);
         if (ret < 0) {
                 //failed to decode msg;
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
 
         frame = get_frame_from_request (req);
         if (!frame) {
                 // something wrong, mostly insufficient memory
-                req->rpc_err = GARBAGE_ARGS; /* TODO */
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
         frame->root->op = GF_FOP_FGETXATTR;
 
         state = CALL_STATE (frame);
-        if (!state->conn->bound_xl) {
+        if (!frame->root->client->bound_xl) {
                 /* auth failure, request on subvolume without setvolume */
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
 
@@ -4294,9 +4676,10 @@ server3_3_fgetxattr (rpcsvc_request_t *req)
         if (args.namelen)
                 state->name = gf_strdup (args.name);
 
-        GF_PROTOCOL_DICT_UNSERIALIZE (state->conn->bound_xl, state->xdata,
-                                      (args.xdata.xdata_val),
-                                      (args.xdata.xdata_len), ret,
+        GF_PROTOCOL_DICT_UNSERIALIZE (frame->root->client->bound_xl,
+                                      state->xdata,
+                                      args.xdata.xdata_val,
+                                      args.xdata.xdata_len, ret,
                                       op_errno, out);
 
         ret = 0;
@@ -4305,7 +4688,7 @@ out:
         free (args.xdata.xdata_val);
 
         if (op_errno)
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
 
         return ret;
 }
@@ -4330,22 +4713,22 @@ server3_3_removexattr (rpcsvc_request_t *req)
                               (xdrproc_t)xdr_gfs3_removexattr_req);
         if (ret < 0) {
                 //failed to decode msg;
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
 
         frame = get_frame_from_request (req);
         if (!frame) {
                 // something wrong, mostly insufficient memory
-                req->rpc_err = GARBAGE_ARGS; /* TODO */
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
         frame->root->op = GF_FOP_REMOVEXATTR;
 
         state = CALL_STATE (frame);
-        if (!state->conn->bound_xl) {
+        if (!frame->root->client->bound_xl) {
                 /* auth failure, request on subvolume without setvolume */
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
 
@@ -4353,9 +4736,10 @@ server3_3_removexattr (rpcsvc_request_t *req)
         memcpy (state->resolve.gfid, args.gfid, 16);
         state->name           = gf_strdup (args.name);
 
-        GF_PROTOCOL_DICT_UNSERIALIZE (state->conn->bound_xl, state->xdata,
-                                      (args.xdata.xdata_val),
-                                      (args.xdata.xdata_len), ret,
+        GF_PROTOCOL_DICT_UNSERIALIZE (frame->root->client->bound_xl,
+                                      state->xdata,
+                                      args.xdata.xdata_val,
+                                      args.xdata.xdata_len, ret,
                                       op_errno, out);
 
         ret = 0;
@@ -4364,7 +4748,7 @@ out:
         free (args.xdata.xdata_val);
 
         if (op_errno)
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
 
         return ret;
 }
@@ -4387,22 +4771,22 @@ server3_3_fremovexattr (rpcsvc_request_t *req)
                               (xdrproc_t)xdr_gfs3_fremovexattr_req);
         if (ret < 0) {
                 //failed to decode msg;
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
 
         frame = get_frame_from_request (req);
         if (!frame) {
                 // something wrong, mostly insufficient memory
-                req->rpc_err = GARBAGE_ARGS; /* TODO */
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
         frame->root->op = GF_FOP_FREMOVEXATTR;
 
         state = CALL_STATE (frame);
-        if (!state->conn->bound_xl) {
+        if (!frame->root->client->bound_xl) {
                 /* auth failure, request on subvolume without setvolume */
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
 
@@ -4411,9 +4795,10 @@ server3_3_fremovexattr (rpcsvc_request_t *req)
         memcpy (state->resolve.gfid, args.gfid, 16);
         state->name           = gf_strdup (args.name);
 
-        GF_PROTOCOL_DICT_UNSERIALIZE (state->conn->bound_xl, state->xdata,
-                                      (args.xdata.xdata_val),
-                                      (args.xdata.xdata_len), ret,
+        GF_PROTOCOL_DICT_UNSERIALIZE (frame->root->client->bound_xl,
+                                      state->xdata,
+                                      args.xdata.xdata_val,
+                                      args.xdata.xdata_len, ret,
                                       op_errno, out);
 
         ret = 0;
@@ -4422,7 +4807,7 @@ out:
         free (args.xdata.xdata_val);
 
         if (op_errno)
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
 
         return ret;
 }
@@ -4446,31 +4831,32 @@ server3_3_opendir (rpcsvc_request_t *req)
                               (xdrproc_t)xdr_gfs3_opendir_req);
         if (ret < 0) {
                 //failed to decode msg;
-                req->rpc_err = GARBAGE_ARGS;
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
 
         frame = get_frame_from_request (req);
         if (!frame) {
                 // something wrong, mostly insufficient memory
-                req->rpc_err = GARBAGE_ARGS; /* TODO */
+                SERVER_REQ_SET_ERROR (req, ret);
                 goto out;
         }
         frame->root->op = GF_FOP_OPENDIR;
 
         state = CALL_STATE (frame);
-        if (!state->conn->bound_xl) {
+        if (!frame->
author	Anoop C S <anoopcs@redhat.com>	2015-10-14 13:11:37 +0530
committer	Niels de Vos <ndevos@redhat.com>	2015-11-09 01:11:58 -0800
commit	f68c95a429b44afc0197152a7819d17ce1de734c (patch)
tree	c4b5e670ecabeb6d8d2d07e16cdce5f49f7d1a19 /geo-replication/syncdaemon
parent	01ed634a490d3ea7c4bbb051a0a9f0512f8f7694 (diff)