nfs: Add generic nfs translator

Signed-off-by: Shehjar Tikoo <shehjart@gluster.com>
Signed-off-by: Anand V. Avati <avati@dev.gluster.com>

BUG: 399 (NFS translator with Mount v3 and NFS v3 support)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=399

1 files changed, 1441 insertions, 0 deletions

diff --git a/xlators/nfs/server/src/nfs-fops.c b/xlators/nfs/server/src/nfs-fops.c
new file mode 100644
index 00000000000..3d4968a8b17
--- /dev/null
+++ b/xlators/nfs/server/src/nfs-fops.c
@@ -0,0 +1,1441 @@
+/*
+  Copyright (c) 2010 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 _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+
+#include "dict.h"
+#include "xlator.h"
+#include "iobuf.h"
+#include "call-stub.h"
+#include "stack.h"
+#include "nfs.h"
+#include "nfs-fops.h"
+#include "inode.h"
+#include "nfs-common.h"
+
+#include <libgen.h>
+#include <semaphore.h>
+
+#define nfs_stack_destroy(fram)                                         \
+        do {                                                            \
+                (fram)->local = NULL;                                   \
+                STACK_DESTROY ((fram)->root);                           \
+        } while (0)                                                     \
+
+
+struct nfs_fop_local *
+nfs_fop_local_init (xlator_t *xl)
+{
+        struct nfs_fop_local    *l = NULL;
+        struct nfs_state        *nfs = NULL;
+        if (!xl)
+                return NULL;
+
+        nfs = xlator_top_private (xl);
+        l = mem_get (nfs->foppool);
+
+        memset (l, 0, sizeof (*l));
+        return l;
+}
+
+void
+nfs_fop_local_wipe (xlator_t *xl, struct nfs_fop_local *l)
+{
+        struct nfs_state        *nfs = NULL;
+
+        if ((!xl) || (!l))
+                return;
+
+        nfs = xlator_top_private (xl);
+
+        if (l->iobref)
+                iobref_unref (l->iobref);
+
+        if (l->parent)
+                inode_unref (l->parent);
+
+        if (l->inode)
+                inode_unref (l->inode);
+
+        if (l->newparent)
+                inode_unref (l->newparent);
+
+        mem_put (nfs->foppool, l);
+
+        return;
+}
+
+call_frame_t *
+nfs_create_frame (xlator_t *xl, nfs_user_t *nfu)
+{
+        call_frame_t    *frame = NULL;
+        int             x = 0;
+        int             y = 0;
+
+        if ((!xl) || (!nfu) || (nfu->ngrps > NFS_NGROUPS))
+                return NULL;
+
+        frame = create_frame (xl, (call_pool_t *)xl->ctx->pool);
+        if (!frame)
+                goto err;
+        frame->root->uid = nfu->uid;
+        frame->root->gid = nfu->gids[NFS_PRIMGID_IDX];
+        if (nfu->ngrps == 1)
+                goto err;       /* Done, we only got primary gid */
+
+        frame->root->ngrps = nfu->ngrps - 1;
+
+        gf_log (GF_NFS, GF_LOG_TRACE,"uid: %d, gid %d, gids: %d",
+                frame->root->uid, frame->root->gid, frame->root->ngrps);
+        for(y = 0, x = 1;  y < frame->root->ngrps; x++,y++) {
+                gf_log (GF_NFS, GF_LOG_TRACE, "gid: %d", nfu->gids[x]);
+                frame->root->groups[y] = nfu->gids[x];
+        }
+
+err:
+        return frame;
+}
+
+#define nfs_fop_handle_frame_create(fram, xla, nfuser, retval, errlabel)      \
+        do {                                                                  \
+                fram = nfs_create_frame (xla, (nfuser));                      \
+                if (!fram) {                                                  \
+                        retval = (-ENOMEM);                                   \
+                        gf_log (GF_NFS, GF_LOG_ERROR,"Frame creation failed");\
+                        goto errlabel;                                        \
+                }                                                             \
+        } while (0)                                                           \
+
+/* Look into the  inode and parent inode of a loc and save enough state
+ * for us to determine in the callback whether to funge the ino in the stat buf
+ * with 1 for the parent.
+ */
+#define nfs_fop_save_root_ino(locl, loc)                                    \
+        do {                                                                \
+                if ((loc)->ino == 1)                                        \
+                        (locl)->rootinode = 1;                              \
+                else if (((loc)->parent) && ((loc)->parent->ino == 1))      \
+                        (locl)->rootparentinode = 1;                        \
+        } while (0)                                                         \
+
+/* Do the same for an fd */
+#define nfs_fop_save_root_fd_ino(locl, fdesc)                               \
+        do {                                                                \
+                if ((fdesc)->inode->ino == 1)                               \
+                        (locl)->rootinode = 1;                              \
+        } while (0)                                                         \
+
+
+
+/* Use the state saved by the previous macro to funge the ino in the appropriate
+ * structure.
+ */
+#define nfs_fop_restore_root_ino(locl, preattr, postattr, prepar, postpar)  \
+        do {                                                                \
+                if ((locl)->rootinode) {                                    \
+                        if ((preattr)) {                                    \
+                                ((struct iatt *)(preattr))->ia_ino = 1;     \
+                                ((struct iatt *)(preattr))->ia_dev = 0;     \
+                        }                                                   \
+                        if ((postattr)) {                                   \
+                                ((struct iatt *)(postattr))->ia_ino = 1;    \
+                                ((struct iatt *)(postattr))->ia_dev = 0;    \
+                        }                                                   \
+                } else if ((locl)->rootparentinode) {                       \
+                        if ((prepar)) {                                     \
+                                ((struct iatt *)(prepar))->ia_ino = 1;      \
+                                ((struct iatt *)(prepar))->ia_dev = 0;      \
+                        }                                                   \
+                        if ((postpar)) {                                    \
+                                ((struct iatt *)(postpar))->ia_ino = 1;     \
+                                ((struct iatt *)(postpar))->ia_dev = 0;     \
+                        }                                                   \
+                }                                                           \
+        } while (0)                                                         \
+
+/* If the newly created, inode's parent is root, we'll need to funge the ino
+ * in the parent attr when we receive them in the callback.
+ */
+#define nfs_fop_newloc_save_root_ino(locl, newloc)                             \
+        do {                                                                   \
+                if ((newloc)->ino == 1)                                        \
+                        (locl)->newrootinode = 1;                              \
+                else if (((newloc)->parent) && ((newloc)->parent->ino == 1))   \
+                        (locl)->newrootparentinode = 1;                        \
+        } while (0)                                                            \
+
+
+#define nfs_fop_newloc_restore_root_ino(locl, preattr, postattr, prepar, postpar)  \
+        do {                                                                   \
+                if ((locl)->newrootinode) {                                    \
+                        if ((preattr))                                         \
+                                ((struct iatt *)(preattr))->ia_ino = 1;        \
+                        if ((postattr))                                        \
+                                ((struct iatt *)(postattr))->ia_ino = 1;       \
+                } else if ((locl)->newrootparentinode) {                       \
+                        if ((prepar))                                          \
+                                ((struct iatt *)(prepar))->ia_ino = 1;         \
+                        if ((postpar))                                         \
+                                ((struct iatt *)(postpar))->ia_ino = 1;        \
+                }                                                              \
+        } while (0)                                                            \
+
+/* Fops Layer Explained
+ * The fops layer has three types of functions. They can all be identified by
+ * their names. Here are the three patterns:
+ *
+ * nfs_fop_<fopname>
+ * This is the lowest level function that knows nothing about states and
+ * callbacks. At most this is required to create a frame and call the
+ * fop. The idea here is to provide a convenient way to call fops than
+ * directly use STACK_WINDs. If this type of interface is used, the caller's
+ * callback is responsible for doing the relevant GlusterFS state
+ * maintenance operations on the data returned in the callbacks.
+ *
+ * nfs_fop_<fopname>_sync
+ * These are synchronous versions of the above fops. The idea is that
+ * if the user wants to wait for the fop to complete, this is the interface to
+ * use. The caller is responsible for doing the relevant GlusterFS
+ * state maintenance operations on the call_stub_t that is returned, including
+ * calling call_stub_destroy.
+ *
+ * nfs_<fopname>_sync
+ * This is help callers avoid the need to pass a pathloc to the
+ * nfs_fop_<fopname>_sync versions of the same fops.
+ *
+ * nfs_<fopname>
+ * Unlike the nfs_fop_<fopname> variety, this is the stateful type of fop, in
+ * that it silently performs all the relevant GlusterFS state maintainence
+ * operations on the data returned to the callbacks, leaving the caller's
+ * callback to just use the data returned for whatever it needs to do with that
+ * data, for eg. the nfs_lookup, will take care of looking up the inodes,
+ * revalidating them if needed and linking new inodes into the table, while
+ * the caller's callback, for eg, the NFSv3 LOOKUP callback can just use
+ * the stat bufs returned to create file handle, map the file handle into the
+ * fh cache and finally encode the fh and the stat bufs into a NFS reply.
+ *
+ */
+
+int32_t
+nfs_fop_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 *xattr, struct iatt *postparent)
+{
+        struct nfs_fop_local    *local = NULL;
+        fop_lookup_cbk_t        progcbk;
+
+        nfl_to_prog_data (this, local, progcbk, frame);
+        nfs_fop_restore_root_ino (local, buf, NULL, NULL, postparent);
+        if (progcbk)
+                progcbk (frame, cookie, this, op_ret, op_errno, inode, buf,
+                         xattr, postparent);
+
+        nfs_stack_destroy (frame);
+        return 0;
+}
+
+
+int
+nfs_fop_lookup (xlator_t *xl, nfs_user_t *nfu, loc_t *loc,
+                fop_lookup_cbk_t cbk, void *local)
+{
+        call_frame_t            *frame = NULL;
+        int                     ret = -EFAULT;
+        struct nfs_fop_local    *nfl = NULL;
+
+        if ((!xl) || (!loc) || (!nfu))
+                return ret;
+
+        gf_log (GF_NFS, GF_LOG_TRACE, "Lookup: %s", loc->path);
+        nfs_fop_handle_frame_create (frame, xl, nfu, ret, err);
+        nfs_fop_handle_local_init (frame, xl, nfl, cbk, local, ret, err);
+        nfs_fop_save_root_ino (nfl, loc);
+
+        STACK_WIND_COOKIE  (frame, nfs_fop_lookup_cbk, xl, xl, xl->fops->lookup,
+                            loc, NULL);
+
+        ret = 0;
+err:
+        if (ret < 0) {
+                if (frame)
+                        nfs_stack_destroy (frame);
+        }
+
+        return ret;
+}
+
+
+int32_t
+nfs_fop_stat_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                  int32_t op_ret, int32_t op_errno, struct iatt *buf)
+{
+        struct nfs_fop_local    *nfl = NULL;
+        fop_stat_cbk_t          progcbk = NULL;
+
+        nfl_to_prog_data (this, nfl, progcbk, frame);
+        nfs_fop_restore_root_ino (nfl, buf, NULL, NULL, NULL);
+        if (progcbk)
+                progcbk (frame, cookie, this, op_ret, op_errno, buf);
+
+        nfs_stack_destroy (frame);
+        return 0;
+}
+
+
+int
+nfs_fop_stat (xlator_t *xl, nfs_user_t *nfu, loc_t *loc,
+              fop_stat_cbk_t cbk, void *local)
+{
+        call_frame_t            *frame = NULL;
+        int                     ret = -EFAULT;
+        struct nfs_fop_local    *nfl = NULL;
+
+        if ((!xl) || (!loc) || (!nfu))
+                return ret;
+
+        gf_log (GF_NFS, GF_LOG_TRACE, "Stat: %s", loc->path);
+        nfs_fop_handle_frame_create (frame, xl, nfu, ret, err);
+        nfs_fop_handle_local_init (frame, xl, nfl, cbk, local, ret, err);
+        nfs_fop_save_root_ino (nfl, loc);
+
+        STACK_WIND_COOKIE  (frame, nfs_fop_stat_cbk, xl, xl, xl->fops->stat,
+                            loc);
+        ret = 0;
+err:
+        if (ret < 0) {
+                if (frame)
+                        nfs_stack_destroy (frame);
+        }
+
+        return ret;
+}
+
+
+int32_t
+nfs_fop_fstat_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                   int32_t op_ret, int32_t op_errno, struct iatt *buf)
+{
+        struct nfs_fop_local    *nfl = NULL;
+        fop_fstat_cbk_t         progcbk = NULL;
+
+        nfl_to_prog_data (this, nfl, progcbk, frame);
+        nfs_fop_restore_root_ino (nfl, buf, NULL, NULL, NULL);
+        if (progcbk)
+                progcbk (frame, cookie, this, op_ret, op_errno, buf);
+
+        nfs_stack_destroy (frame);
+        return 0;
+}
+
+
+int
+nfs_fop_fstat (xlator_t *xl, nfs_user_t *nfu, fd_t *fd,
+               fop_fstat_cbk_t cbk, void *local)
+{
+        call_frame_t            *frame = NULL;
+        int                     ret = -EFAULT;
+        struct nfs_fop_local    *nfl = NULL;
+
+        if ((!xl) || (!fd) || (!nfu))
+                return ret;
+
+        gf_log (GF_NFS, GF_LOG_TRACE, "FStat");
+        nfs_fop_handle_frame_create (frame, xl, nfu, ret, err);
+        nfs_fop_handle_local_init (frame, xl, nfl, cbk, local, ret, err);
+        nfs_fop_save_root_fd_ino (nfl, fd);
+
+        STACK_WIND_COOKIE  (frame, nfs_fop_fstat_cbk, xl, xl, xl->fops->fstat,
+                            fd);
+
+        ret = 0;
+err:
+        if (ret < 0) {
+                if (frame)
+                        nfs_stack_destroy (frame);
+        }
+
+        return ret;
+}
+
+
+int32_t
+nfs_fop_opendir_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                     int32_t op_ret, int32_t op_errno, fd_t *fd)
+{
+        struct nfs_fop_local    *nfl = NULL;
+        fop_opendir_cbk_t       progcbk = NULL;
+
+        nfl_to_prog_data (this, nfl, progcbk, frame);
+        if (progcbk)
+                progcbk (frame, cookie, this, op_ret, op_errno, fd);
+        nfs_stack_destroy (frame);
+        return 0;
+}
+
+
+int
+nfs_fop_opendir (xlator_t *xl, nfs_user_t *nfu, loc_t *pathloc,fd_t *dirfd,
+                 fop_opendir_cbk_t cbk, void *local)
+{
+        call_frame_t            *frame = NULL;
+        int                     ret = -EFAULT;
+        struct nfs_fop_local    *nfl = NULL;
+
+        if ((!xl) || (!pathloc) || (!dirfd) || (!nfu))
+                return ret;
+
+        gf_log (GF_NFS, GF_LOG_TRACE, "Opendir: %s", pathloc->path);
+        nfs_fop_handle_frame_create (frame, xl, nfu, ret, err);
+        nfs_fop_handle_local_init (frame, xl, nfl, cbk, local, ret, err);
+
+        STACK_WIND_COOKIE (frame, nfs_fop_opendir_cbk, xl, xl,
+                           xl->fops->opendir, pathloc, dirfd);
+        ret = 0;
+
+err:
+        if (ret < 0) {
+                if (frame)
+                        nfs_stack_destroy (frame);
+        }
+
+        return ret;
+}
+
+int
+nfs_fop_flush_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                   int32_t op_ret, int32_t op_errno)
+{
+        struct nfs_fop_local    *nfl = NULL;
+        fop_flush_cbk_t         progcbk = NULL;
+
+        nfl_to_prog_data (this, nfl, progcbk, frame);
+        if (progcbk)
+                progcbk (frame, cookie, this, op_ret, op_errno);
+
+        nfs_stack_destroy (frame);
+        return 0;
+}
+
+
+int
+nfs_fop_flush (xlator_t *xl, nfs_user_t *nfu, fd_t *fd,
+               fop_flush_cbk_t cbk, void *local)
+{
+        call_frame_t            *frame = NULL;
+        int                     ret = -EFAULT;
+        struct nfs_fop_local    *nfl = NULL;
+
+        if ((!xl) || (!fd) || (!nfu))
+                return ret;
+
+        nfs_fop_handle_frame_create (frame, xl, nfu, ret, err);
+        nfs_fop_handle_local_init (frame, xl, nfl, cbk, local, ret, err);
+
+        STACK_WIND_COOKIE (frame, nfs_fop_flush_cbk, xl, xl, xl->fops->flush,
+                           fd);
+        ret = 0;
+err:
+        if (ret < 0) {
+                if (frame)
+                        nfs_stack_destroy (frame);
+        }
+
+        return ret;
+}
+
+
+int32_t
+nfs_fop_readdirp_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                      int32_t op_ret, int32_t op_errno, gf_dirent_t *entries)
+{
+        struct nfs_fop_local    *nfl = NULL;
+        fop_readdirp_cbk_t      progcbk = NULL;
+
+        nfl_to_prog_data (this, nfl, progcbk, frame);
+        if (progcbk)
+                progcbk (frame, cookie, this, op_ret, op_errno, entries);
+
+        nfs_stack_destroy (frame);
+
+        return 0;
+}
+
+
+int
+nfs_fop_readdirp (xlator_t *xl, nfs_user_t *nfu, fd_t *dirfd,
+                  size_t bufsize, off_t offset, fop_readdirp_cbk_t cbk,
+                  void *local)
+{
+        call_frame_t            *frame = NULL;
+        int                     ret = -EFAULT;
+        struct nfs_fop_local    *nfl = NULL;
+
+        if ((!xl) || (!dirfd) || (!nfu))
+                return ret;
+
+        gf_log (GF_NFS, GF_LOG_TRACE, "readdir");
+        nfs_fop_handle_frame_create (frame, xl, nfu, ret, err);
+        nfs_fop_handle_local_init (frame, xl, nfl, cbk, local, ret, err);
+
+        STACK_WIND_COOKIE (frame, nfs_fop_readdirp_cbk, xl, xl,
+                           xl->fops->readdirp, dirfd, bufsize, offset);
+
+        ret = 0;
+err:
+        if (ret < 0) {
+                if (frame)
+                        nfs_stack_destroy (frame);
+        }
+
+        return ret;
+}
+
+
+int32_t
+nfs_fop_statfs_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                    int32_t op_ret, int32_t op_errno, struct statvfs *buf)
+{
+
+        struct nfs_fop_local    *nfl = NULL;
+        fop_statfs_cbk_t        progcbk = NULL;
+
+        nfl_to_prog_data (this, nfl, progcbk, frame);
+        if (progcbk)
+                progcbk (frame, cookie, this, op_ret, op_errno, buf);
+
+        nfs_stack_destroy (frame);
+        return 0;
+}
+
+
+int
+nfs_fop_statfs (xlator_t *xl, nfs_user_t *nfu, loc_t *pathloc,
+                fop_statfs_cbk_t cbk, void *local)
+{
+        call_frame_t            *frame = NULL;
+        int                     ret = -EFAULT;
+        struct nfs_fop_local    *nfl = NULL;
+
+        if ((!xl) || (!pathloc) || (!nfu))
+                return ret;
+
+        gf_log (GF_NFS, GF_LOG_TRACE, "Statfs: %s", pathloc->path);
+        nfs_fop_handle_frame_create (frame, xl, nfu, ret, err);
+        nfs_fop_handle_local_init (frame, xl, nfl, cbk, local, ret, err);
+
+        STACK_WIND_COOKIE  (frame, nfs_fop_statfs_cbk, xl, xl, xl->fops->statfs
+                            ,pathloc);
+        ret = 0;
+err:
+        if (ret < 0) {
+                if (frame)
+                        nfs_stack_destroy (frame);
+        }
+
+        return ret;
+}
+
+
+int32_t
+nfs_fop_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)
+{
+        struct nfs_fop_local    *nfl = NULL;
+        fop_create_cbk_t        progcbk = NULL;
+
+        nfl_to_prog_data (this, nfl, progcbk, frame);
+        nfs_fop_restore_root_ino (nfl, buf, NULL, preparent, postparent);
+        if (progcbk)
+                progcbk (frame, cookie, this, op_ret, op_errno, fd, inode, buf,
+                         preparent, postparent);
+
+        nfs_stack_destroy (frame);
+        return 0;
+}
+
+
+int
+nfs_fop_create (xlator_t *xl, nfs_user_t *nfu, loc_t *pathloc, int flags,
+                mode_t mode, fd_t *fd, fop_create_cbk_t cbk, void *local)
+{
+        call_frame_t            *frame = NULL;
+        int                     ret = -EFAULT;
+        struct nfs_fop_local    *nfl = NULL;
+
+        if ((!xl) || (!pathloc) || (!nfu))
+                return ret;
+
+        gf_log (GF_NFS, GF_LOG_TRACE, "Create: %s", pathloc->path);
+        nfs_fop_handle_frame_create (frame, xl, nfu, ret, err);
+        nfs_fop_handle_local_init (frame, xl, nfl, cbk, local, ret, err);
+        nfs_fop_save_root_ino (nfl, pathloc);
+
+        STACK_WIND_COOKIE  (frame, nfs_fop_create_cbk, xl, xl, xl->fops->create
+                            , pathloc, flags, mode, fd);
+        ret = 0;
+err:
+        if (ret < 0) {
+                if (frame)
+                        nfs_stack_destroy (frame);
+        }
+
+        return ret;
+}
+
+
+int32_t
+nfs_fop_setattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                     int32_t op_ret, int32_t op_errno, struct iatt *pre,
+                     struct iatt *post)
+{
+        struct nfs_fop_local    *nfl = NULL;
+        fop_setattr_cbk_t       progcbk = NULL;
+
+        nfl_to_prog_data (this, nfl, progcbk, frame);
+        nfs_fop_restore_root_ino (nfl, pre, post, NULL, NULL);
+        if (progcbk)
+                progcbk (frame, cookie, this, op_ret, op_errno, pre, post);
+        nfs_stack_destroy (frame);
+        return 0;
+}
+
+
+
+int
+nfs_fop_setattr (xlator_t *xl, nfs_user_t *nfu, loc_t *pathloc,
+                 struct iatt *buf, int32_t valid, fop_setattr_cbk_t cbk,
+                 void *local)
+{
+        call_frame_t            *frame = NULL;
+        int                     ret = -EFAULT;
+        struct nfs_fop_local    *nfl = NULL;
+
+        if ((!xl) || (!pathloc) || (!nfu))
+                return ret;
+
+        gf_log (GF_NFS, GF_LOG_TRACE, "Setattr: %s", pathloc->path);
+        nfs_fop_handle_frame_create (frame, xl, nfu, ret, err);
+        nfs_fop_handle_local_init (frame, xl, nfl, cbk, local, ret, err);
+        nfs_fop_save_root_ino (nfl, pathloc);
+
+        STACK_WIND_COOKIE (frame, nfs_fop_setattr_cbk, xl, xl,
+                           xl->fops->setattr, pathloc, buf, valid);
+        ret = 0;
+err:
+        if (ret < 0) {
+                if (frame)
+                        nfs_stack_destroy (frame);
+        }
+
+        return ret;
+}
+
+
+int32_t
+nfs_fop_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)
+{
+        struct nfs_fop_local    *nfl = NULL;
+        fop_mkdir_cbk_t         progcbk = NULL;
+
+        nfl_to_prog_data (this, nfl, progcbk, frame);
+        nfs_fop_restore_root_ino (nfl, buf, NULL, preparent, postparent);
+        if (progcbk)
+                progcbk (frame, cookie, this, op_ret, op_errno, inode, buf,
+                         preparent, postparent);
+        nfs_stack_destroy (frame);
+        return 0;
+}
+
+
+int
+nfs_fop_mkdir (xlator_t *xl, nfs_user_t *nfu, loc_t *pathloc, mode_t mode,
+               fop_mkdir_cbk_t cbk, void *local)
+{
+        call_frame_t            *frame = NULL;
+        int                     ret = -EFAULT;
+        struct nfs_fop_local    *nfl = NULL;
+
+        if ((!xl) || (!pathloc) || (!nfu))
+                return ret;
+
+        gf_log (GF_NFS, GF_LOG_TRACE, "Mkdir: %s", pathloc->path);
+        nfs_fop_handle_frame_create (frame, xl, nfu, ret, err);
+        nfs_fop_handle_local_init (frame, xl, nfl, cbk, local, ret, err);
+        nfs_fop_save_root_ino (nfl, pathloc);
+
+        STACK_WIND_COOKIE  (frame, nfs_fop_mkdir_cbk, xl, xl, xl->fops->mkdir,
+                            pathloc, mode);
+        ret = 0;
+err:
+        if (ret < 0) {
+                if (frame)
+                        nfs_stack_destroy (frame);
+        }
+
+        return ret;
+}
+
+
+int32_t
+nfs_fop_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)
+{
+        struct nfs_fop_local    *nfl = NULL;
+        fop_symlink_cbk_t       progcbk = NULL;
+
+        nfl_to_prog_data (this, nfl, progcbk, frame);
+        nfs_fop_restore_root_ino (nfl, buf, NULL, preparent, postparent);
+        if (progcbk)
+                progcbk (frame, cookie, this, op_ret, op_errno, inode, buf,
+                         preparent, postparent);
+        nfs_stack_destroy (frame);
+        return 0;
+}
+
+int
+nfs_fop_symlink (xlator_t *xl, nfs_user_t *nfu, char *target,
+                 loc_t *pathloc, fop_symlink_cbk_t cbk, void *local)
+{
+        call_frame_t            *frame = NULL;
+        int                     ret = -EFAULT;
+        struct nfs_fop_local    *nfl = NULL;
+
+        if ((!xl) || (!pathloc) || (!target) || (!nfu))
+                return ret;
+
+        gf_log (GF_NFS, GF_LOG_TRACE, "Symlink: %s", pathloc->path);
+        nfs_fop_handle_frame_create (frame, xl, nfu, ret, err);
+        nfs_fop_handle_local_init (frame, xl, nfl, cbk, local, ret, err);
+        nfs_fop_save_root_ino (nfl, pathloc);
+
+        STACK_WIND_COOKIE  (frame, nfs_fop_symlink_cbk, xl, xl,
+                            xl->fops->symlink, target, pathloc);
+        ret = 0;
+err:
+        if (ret < 0) {
+                if (frame)
+                        nfs_stack_destroy (frame);
+        }
+
+        return ret;
+}
+
+
+int32_t
+nfs_fop_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)
+{
+        struct nfs_fop_local    *nfl = NULL;
+        fop_readlink_cbk_t      progcbk = NULL;
+
+        nfl_to_prog_data (this, nfl, progcbk, frame);
+        nfs_fop_restore_root_ino (nfl, buf, NULL, NULL, NULL);
+        if (progcbk)
+                progcbk (frame, cookie, this, op_ret, op_errno, path, buf);
+        nfs_stack_destroy (frame);
+        return 0;
+}
+
+
+int
+nfs_fop_readlink (xlator_t *xl, nfs_user_t *nfu, loc_t *pathloc,
+                  size_t size, fop_readlink_cbk_t cbk, void *local)
+{
+        call_frame_t            *frame = NULL;
+        int                     ret = -EFAULT;
+        struct nfs_fop_local    *nfl = NULL;
+
+        if ((!xl) || (!pathloc) || (!nfu))
+                return ret;
+
+        gf_log (GF_NFS, GF_LOG_TRACE, "Readlink: %s", pathloc->path);
+        nfs_fop_handle_frame_create (frame, xl, nfu, ret, err);
+        nfs_fop_handle_local_init (frame, xl, nfl, cbk, local, ret, err);
+        nfs_fop_save_root_ino (nfl, pathloc);
+
+        STACK_WIND_COOKIE  (frame, nfs_fop_readlink_cbk, xl, xl,
+                            xl->fops->readlink, pathloc, size);
+        ret = 0;
+err:
+        if (ret < 0) {
+                if (frame)
+                        nfs_stack_destroy (frame);
+        }
+
+        return ret;
+}
+
+
+int32_t
+nfs_fop_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)
+{
+        struct nfs_fop_local    *nfl = NULL;
+        fop_mknod_cbk_t         progcbk = NULL;
+
+        nfl_to_prog_data (this, nfl, progcbk, frame);
+        nfs_fop_restore_root_ino (nfl, buf, NULL, preparent, postparent);
+        if (progcbk)
+                progcbk (frame, cookie, this, op_ret, op_errno, inode, buf,
+                         preparent, postparent);
+        nfs_stack_destroy (frame);
+        return 0;
+}
+
+
+int
+nfs_fop_mknod (xlator_t *xl, nfs_user_t *nfu, loc_t *pathloc, mode_t mode,
+               dev_t dev, fop_mknod_cbk_t cbk, void *local)
+{
+        call_frame_t            *frame = NULL;
+        int                     ret = -EFAULT;
+        struct nfs_fop_local    *nfl = NULL;
+
+        if ((!xl) || (!pathloc) || (!nfu))
+                return ret;
+
+        gf_log (GF_NFS, GF_LOG_TRACE, "Mknod: %s", pathloc->path);
+        nfs_fop_handle_frame_create (frame, xl, nfu, ret, err);
+        nfs_fop_handle_local_init (frame, xl, nfl, cbk, local, ret, err);
+        nfs_fop_save_root_ino (nfl, pathloc);
+
+        STACK_WIND_COOKIE  (frame, nfs_fop_mknod_cbk, xl, xl, xl->fops->mknod,
+                            pathloc, mode, dev);
+        ret = 0;
+err:
+        if (ret < 0) {
+                if (frame)
+                        nfs_stack_destroy (frame);
+        }
+
+        return ret;
+
+}
+
+int32_t
+nfs_fop_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)
+{
+        struct nfs_fop_local    *nfl = frame->local;
+        fop_rmdir_cbk_t         progcbk = NULL;
+
+        nfl_to_prog_data (this, nfl, progcbk, frame);
+        nfs_fop_restore_root_ino (nfl, NULL, NULL, preparent, postparent);
+        if (progcbk)
+                progcbk (frame, cookie, this, op_ret, op_errno, preparent,
+                         postparent);
+        nfs_stack_destroy (frame);
+        return 0;
+}
+
+
+
+int
+nfs_fop_rmdir (xlator_t *xl, nfs_user_t *nfu, loc_t *pathloc,
+               fop_rmdir_cbk_t cbk, void *local)
+{
+        call_frame_t            *frame = NULL;
+        int                     ret = -EFAULT;
+        struct nfs_fop_local    *nfl = NULL;
+
+        if ((!xl) || (!pathloc) || (!nfu))
+                return ret;
+
+        gf_log (GF_NFS, GF_LOG_TRACE, "Rmdir: %s", pathloc->path);
+        nfs_fop_handle_frame_create (frame, xl, nfu, ret, err);
+        nfs_fop_handle_local_init (frame, xl, nfl, cbk, local, ret, err);
+        nfs_fop_save_root_ino (nfl, pathloc);
+
+        STACK_WIND_COOKIE  (frame, nfs_fop_rmdir_cbk, xl, xl, xl->fops->rmdir,
+                            pathloc);
+        ret = 0;
+err:
+        if (ret < 0) {
+                if (frame)
+                        nfs_stack_destroy (frame);
+        }
+
+        return ret;
+
+}
+
+
+int32_t
+nfs_fop_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)
+{
+        struct nfs_fop_local    *nfl = frame->local;
+        fop_unlink_cbk_t         progcbk = NULL;
+
+        nfl_to_prog_data (this, nfl, progcbk, frame);
+        nfs_fop_restore_root_ino (nfl, NULL, NULL, preparent, postparent);
+        if (progcbk)
+                progcbk (frame, cookie, this, op_ret, op_errno, preparent,
+                         postparent);
+        nfs_stack_destroy (frame);
+        return 0;
+}
+
+
+int
+nfs_fop_unlink (xlator_t *xl, nfs_user_t *nfu, loc_t *pathloc,
+                fop_unlink_cbk_t cbk, void *local)
+{
+        call_frame_t            *frame = NULL;
+        int                     ret = -EFAULT;
+        struct nfs_fop_local    *nfl = NULL;
+
+        if ((!xl) || (!pathloc) || (!nfu))
+                return ret;
+
+        gf_log (GF_NFS, GF_LOG_TRACE, "Unlink: %s", pathloc->path);
+        nfs_fop_handle_frame_create (frame, xl, nfu, ret, err);
+        nfs_fop_handle_local_init (frame, xl, nfl, cbk, local, ret, err);
+        nfs_fop_save_root_ino (nfl, pathloc);
+
+        STACK_WIND_COOKIE  (frame, nfs_fop_unlink_cbk, xl, xl, xl->fops->unlink,
+                            pathloc);
+        ret = 0;
+err:
+        if (ret < 0) {
+                if (frame)
+                        nfs_stack_destroy (frame);
+        }
+
+        return ret;
+
+}
+
+
+int32_t
+nfs_fop_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)
+{
+        struct nfs_fop_local    *nfl = NULL;
+        fop_link_cbk_t          progcbk = NULL;
+
+        nfl_to_prog_data (this, nfl, progcbk, frame);
+        nfs_fop_restore_root_ino (nfl, buf, NULL, preparent, postparent);
+        if (progcbk)
+                progcbk (frame, cookie, this, op_ret, op_errno, inode, buf,
+                         preparent, postparent);
+
+        nfs_stack_destroy (frame);
+        return 0;
+}
+
+
+int
+nfs_fop_link (xlator_t *xl, nfs_user_t *nfu, loc_t *oldloc, loc_t *newloc,
+              fop_link_cbk_t cbk, void *local)
+{
+        call_frame_t            *frame = NULL;
+        int                     ret = -EFAULT;
+        struct nfs_fop_local    *nfl = NULL;
+
+        if ((!xl) || (!oldloc) || (!newloc) || (!nfu))
+                return ret;
+
+        gf_log (GF_NFS, GF_LOG_TRACE, "Link: %s -> %s", newloc->path,
+                oldloc->path);
+        nfs_fop_handle_frame_create (frame, xl, nfu, ret, err);
+        nfs_fop_handle_local_init (frame, xl, nfl, cbk, local, ret, err);
+        nfs_fop_save_root_ino (nfl, newloc);
+
+        STACK_WIND_COOKIE (frame, nfs_fop_link_cbk, xl, xl, xl->fops->link,
+                           oldloc, newloc);
+        ret = 0;
+err:
+        if (ret < 0) {
+                if (frame)
+                        nfs_stack_destroy (frame);
+        }
+
+        return ret;
+}
+
+
+int32_t
+nfs_fop_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)
+{
+
+        struct nfs_fop_local    *nfl = NULL;
+        fop_rename_cbk_t        progcbk = NULL;
+
+        nfl_to_prog_data (this, nfl, progcbk, frame);
+        /* The preattr arg needs to be NULL instead of @buf because it is
+         * possible that the new parent is not root whereas the source dir
+         * could've been. That is handled in the next macro.
+         */
+        nfs_fop_restore_root_ino (nfl, NULL, NULL, preoldparent, postoldparent);
+        nfs_fop_newloc_restore_root_ino (nfl, buf, NULL, prenewparent,
+                                         postnewparent);
+        if (progcbk)
+                progcbk (frame, cookie, this, op_ret, op_errno, buf,
+                         preoldparent, postoldparent, prenewparent,
+                         postnewparent);
+        nfs_stack_destroy (frame);
+        return 0;
+}
+
+
+int
+nfs_fop_rename (xlator_t *xl, nfs_user_t *nfu, loc_t *oldloc,
+                loc_t *newloc, fop_rename_cbk_t cbk, void *local)
+{
+        call_frame_t            *frame = NULL;
+        int                     ret = -EFAULT;
+        struct nfs_fop_local    *nfl = NULL;
+
+        if ((!xl) || (!oldloc) || (!newloc) || (!nfu))
+                return ret;
+
+        gf_log (GF_NFS, GF_LOG_TRACE, "Rename: %s -> %s", oldloc->path,
+                newloc->path);
+        nfs_fop_handle_frame_create (frame, xl, nfu, ret, err);
+        nfs_fop_handle_local_init (frame, xl, nfl, cbk, local, ret, err);
+        nfs_fop_save_root_ino (nfl, oldloc);
+        nfs_fop_newloc_save_root_ino (nfl, newloc);
+
+        STACK_WIND_COOKIE  (frame, nfs_fop_rename_cbk, xl, xl, xl->fops->rename,
+                            oldloc, newloc);
+        ret = 0;
+err:
+        if (ret < 0) {
+                if (frame)
+                        nfs_stack_destroy (frame);
+        }
+
+        return ret;
+}
+
+
+int32_t
+nfs_fop_open_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                  int32_t op_ret, int32_t op_errno, fd_t *fd)
+{
+        struct nfs_fop_local    *nfl = NULL;
+        fop_open_cbk_t          progcbk = NULL;
+
+        nfl_to_prog_data (this, nfl, progcbk, frame);
+        if (progcbk)
+                progcbk (frame, cookie, this, op_ret, op_errno, fd);
+        nfs_stack_destroy (frame);
+
+        return 0;
+}
+
+int
+nfs_fop_open (xlator_t *xl, nfs_user_t *nfu, loc_t *loc, int32_t flags,
+              fd_t *fd, int32_t wbflags, fop_open_cbk_t cbk, void *local)
+{
+        call_frame_t            *frame = NULL;
+        int                     ret = -EFAULT;
+        struct nfs_fop_local    *nfl = NULL;
+
+        if ((!xl) || (!loc) || (!fd) || (!nfu))
+                return ret;
+
+        gf_log (GF_NFS, GF_LOG_TRACE, "Open: %s", loc->path);
+        nfs_fop_handle_frame_create (frame, xl, nfu, ret, err);
+        nfs_fop_handle_local_init (frame, xl, nfl, cbk, local, ret, err);
+
+        STACK_WIND_COOKIE  (frame, nfs_fop_open_cbk, xl, xl, xl->fops->open,
+                            loc, flags, fd, wbflags);
+        ret = 0;
+err:
+        if (ret < 0) {
+                if (frame)
+                        nfs_stack_destroy (frame);
+        }
+
+        return ret;
+
+}
+
+
+int32_t
+nfs_fop_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)
+{
+        struct nfs_fop_local    *nfl = NULL;
+        fop_writev_cbk_t        progcbk = NULL;
+
+        nfl_to_prog_data (this, nfl, progcbk, frame);
+        nfs_fop_restore_root_ino (nfl, prebuf, postbuf, NULL, NULL);
+        if (progcbk)
+                progcbk (frame, cookie, this, op_ret, op_errno, prebuf,postbuf);
+
+        nfs_stack_destroy (frame);
+
+        return 0;
+}
+
+
+int
+nfs_fop_write (xlator_t *xl, nfs_user_t *nfu, fd_t *fd, struct iobuf *srciob,
+               struct iovec *vector, int32_t count, off_t offset,
+               fop_writev_cbk_t cbk, void *local)
+{
+        call_frame_t            *frame = NULL;
+        int                     ret = -EFAULT;
+        struct nfs_fop_local    *nfl = NULL;
+
+        if ((!xl) || (!fd) || (!vector) || (!nfu) || (!srciob))
+                return ret;
+
+        nfs_fop_handle_frame_create (frame, xl, nfu, ret, err);
+        nfs_fop_handle_local_init (frame, xl, nfl, cbk, local, ret, err);
+        nfs_fop_save_root_fd_ino (nfl, fd);
+
+        nfl->iobref = iobref_new ();
+        if (!nfl->iobref) {
+                gf_log (GF_NFS, GF_LOG_ERROR, "iobref creation failed");
+                ret = -ENOMEM;
+                goto err;
+        }
+
+        iobref_add (nfl->iobref, srciob);
+        STACK_WIND_COOKIE  (frame, nfs_fop_writev_cbk, xl, xl, xl->fops->writev
+                            , fd, vector, count, offset, nfl->iobref);
+        ret = 0;
+err:
+        if (ret < 0) {
+                if (frame)
+                        nfs_stack_destroy (frame);
+                nfs_fop_local_wipe (xl, nfl);
+        }
+
+        return ret;
+}
+
+
+int32_t
+nfs_fop_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)
+{
+        struct nfs_fop_local    *nfl = NULL;
+        fop_fsync_cbk_t         progcbk = NULL;
+
+        nfl_to_prog_data (this, nfl, progcbk, frame);
+        nfs_fop_restore_root_ino (nfl, prebuf, postbuf, NULL, NULL);
+        if (progcbk)
+                progcbk (frame, cookie, this, op_ret, op_errno, prebuf,postbuf);
+        nfs_stack_destroy (frame);
+        return 0;
+}
+
+
+
+int
+nfs_fop_fsync (xlator_t *xl, nfs_user_t *nfu, fd_t *fd, int32_t datasync,
+               fop_fsync_cbk_t cbk, void *local)
+{
+        call_frame_t            *frame = NULL;
+        int                     ret = -EFAULT;
+        struct nfs_fop_local    *nfl = NULL;
+
+        if ((!xl) || (!fd))
+                return ret;
+
+        nfs_fop_handle_frame_create (frame, xl, nfu, ret, err);
+        nfs_fop_handle_local_init (frame, xl, nfl, cbk, local, ret, err);
+        nfs_fop_save_root_fd_ino (nfl, fd);
+
+        STACK_WIND_COOKIE (frame, nfs_fop_fsync_cbk, xl, xl,
+                           xl->fops->fsync, fd, datasync);
+        ret = 0;
+err:
+        if (ret < 0) {
+                if (frame)
+                        nfs_stack_destroy (frame);
+        }
+
+        return ret;
+}
+
+
+int32_t
+nfs_fop_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)
+{
+        struct nfs_fop_local    *nfl = NULL;
+        fop_readv_cbk_t         progcbk = NULL;
+
+        nfl_to_prog_data (this, nfl, progcbk, frame);
+        nfs_fop_restore_root_ino (nfl, stbuf, NULL, NULL, NULL);
+        if (progcbk)
+                progcbk (frame, cookie, this, op_ret, op_errno, vector, count,
+                         stbuf, iobref);
+
+        nfs_stack_destroy (frame);
+        return 0;
+}
+
+
+int
+nfs_fop_read (xlator_t *xl, nfs_user_t *nfu, fd_t *fd, size_t size,
+              off_t offset, fop_readv_cbk_t cbk, void *local)
+{
+        call_frame_t            *frame = NULL;
+        int                     ret = -EFAULT;
+        struct nfs_fop_local    *nfl = NULL;
+
+        if ((!xl) || (!fd) || (!nfu))
+                return ret;
+
+        nfs_fop_handle_frame_create (frame, xl, nfu, ret, err);
+        nfs_fop_handle_local_init (frame, xl, nfl, cbk, local, ret, err);
+        nfs_fop_save_root_fd_ino (nfl, fd);
+
+        STACK_WIND_COOKIE (frame, nfs_fop_readv_cbk, xl, xl, xl->fops->readv, fd
+                           , size, offset);
+        ret = 0;
+err:
+        if (ret < 0) {
+                if (frame)
+                        nfs_stack_destroy (frame);
+        }
+
+        return ret;
+}
+
+
+int32_t
+nfs_fop_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)
+{
+        struct nfs_fop_local    *nfl = NULL;
+        fop_truncate_cbk_t      progcbk = NULL;
+
+        nfl_to_prog_data (this, nfl, progcbk, frame);
+        nfs_fop_restore_root_ino (nfl, prebuf, postbuf, NULL, NULL);
+        if (progcbk)
+                progcbk (frame, cookie, this, op_ret, op_errno, prebuf,postbuf);
+
+        nfs_stack_destroy (frame);
+        return 0;
+}
+
+
+int
+nfs_fop_truncate (xlator_t *xl, nfs_user_t *nfu, loc_t *loc, off_t offset,
+                  fop_truncate_cbk_t cbk, void *local)
+{
+        call_frame_t            *frame = NULL;
+        int                     ret = -EFAULT;
+        struct nfs_fop_local    *nfl = NULL;
+
+        if ((!xl) || (!loc) || (!nfu))
+                return ret;
+
+        nfs_fop_handle_frame_create (frame, xl, nfu, ret, err);
+        nfs_fop_handle_local_init (frame, xl, nfl, cbk, local, ret, err);
+        nfs_fop_save_root_ino (nfl, loc);
+
+        STACK_WIND_COOKIE  (frame, nfs_fop_truncate_cbk, xl, xl,
+                            xl->fops->truncate, loc, offset);
+
+        ret = 0;
+err:
+        if (ret < 0) {
+                if (frame)
+                        nfs_stack_destroy (frame);
+        }
+
+        return ret;
+}
+
+
+int
+nfs_fop_lookup_sync_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 *xattr,
+                         struct iatt *postparent)
+{
+        nfs_syncfop_t   *sf = frame->local;
+
+        if (!sf)
+                return -1;
+
+        if (op_ret == -1)
+                gf_log (GF_NFS, GF_LOG_TRACE, "Sync lookup failed: %s",
+                        strerror (op_errno));
+        else
+                gf_log (GF_NFS, GF_LOG_TRACE, "Sync lookup done");
+
+        sf->replystub = fop_lookup_cbk_stub (frame, NULL, op_ret, op_errno,
+                                             inode, buf, xattr, postparent);
+        nfs_syncfop_notify (sf);
+        return 0;
+}
+
+
+call_stub_t *
+nfs_fop_lookup_sync (xlator_t *xl, nfs_user_t *nfu, loc_t *loc)
+{
+        nfs_syncfop_t   *sf = NULL;
+        call_stub_t     *reply = NULL;
+        int             ret = -1;
+
+        if ((!xl) || (!loc) || (!nfu))
+                return NULL;
+
+        sf = nfs_syncfop_init ();
+        if (!sf) {
+                gf_log (GF_NFS, GF_LOG_ERROR, "synclocal init failed");
+                goto err;
+        }
+
+        ret = nfs_fop_lookup (xl, nfu, loc, nfs_fop_lookup_sync_cbk, sf);
+        if (ret < 0) {
+                gf_log (GF_NFS, GF_LOG_ERROR, "Sync lookup failed");
+                goto err;
+        }
+
+        reply = nfs_syncfop_wait (sf);
+
+err:
+        return reply;
+}
+
+
+
+int32_t
+nfs_fop_readdirp_sync_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                           int32_t op_ret, int32_t op_errno,
+                           gf_dirent_t *entries)
+{
+        nfs_syncfop_t   *sf = frame->local;
+
+        if (op_ret == -1)
+                gf_log (GF_NFS, GF_LOG_TRACE, "Sync readdir failed: %s",
+                        strerror (op_errno));
+        else
+                gf_log (GF_NFS, GF_LOG_TRACE, "Sync readdir done");
+
+        sf->replystub = fop_readdirp_cbk_stub (frame, NULL, op_ret, op_errno,
+                                               entries);
+
+        nfs_syncfop_notify (sf);
+        return 0;
+}
+
+
+/* This function does not update or map the st_dev in the d_stat of all the
+ * entries that were read. That mapping for the sync version of readdiring
+ * happens in the dcache.
+ */
+call_stub_t *
+nfs_fop_readdirp_sync (xlator_t *fopxl, nfs_user_t *nfu, fd_t *dirfd,
+                       off_t offset, size_t bufsize)
+{
+        nfs_syncfop_t           *sf = NULL;
+        call_stub_t             *reply = NULL;
+        int                     ret = -1;
+
+        if ((!fopxl) || (!nfu) || (!dirfd))
+                return NULL;
+
+        sf = nfs_syncfop_init ();
+        if (!sf) {
+                gf_log (GF_NFS, GF_LOG_ERROR, "sync fop local init failed");
+                goto ret;
+        }
+
+        ret = nfs_fop_readdirp (fopxl, nfu, dirfd, bufsize, offset,
+                                nfs_fop_readdirp_sync_cbk, sf);
+        if (ret < 0) {
+                gf_log (GF_NFS, GF_LOG_ERROR, "Fop readdir failed: %s",
+                        strerror (-ret));
+                goto ret;
+        }
+
+        reply = nfs_syncfop_wait (sf);
+
+ret:
+        return reply;
+}
+
+
+
+nfs_syncfop_t *
+nfs_syncfop_init ()
+{
+        nfs_syncfop_t   *sfl = NULL;
+
+        sfl = CALLOC (1, sizeof (*sfl));
+        if (!sfl) {
+                gf_log (GF_NFS, GF_LOG_ERROR, "Memory allocation failed");
+                return NULL;
+        }
+
+        sem_init (&sfl->replysig, 0, 0);
+
+        return sfl;
+}
+
+
+call_stub_t *
+nfs_syncfop_wait (nfs_syncfop_t *s)
+{
+        call_stub_t     *replystub = NULL;
+
+        gf_log (GF_NFS, GF_LOG_TRACE, "Waiting for sync fop");
+        sem_wait (&s->replysig);
+        gf_log (GF_NFS, GF_LOG_TRACE, "Sync fop notification received");
+        replystub = s->replystub;
+        FREE (s);
+        return replystub;
+}
+
+
+void
+nfs_syncfop_notify (nfs_syncfop_t *s)
+{
+        sem_post (&s->replysig);
+        gf_log (GF_NFS, GF_LOG_TRACE, "Sync fop notified");
+}
+
+
+