afr: heal gfid as a part of entry heal

Problem:
If a brick crashes after an entry (file or dir) is created but before
gfid is assigned, the good bricks will have pending entry heal xattrs
but the heal won't complete because afr_selfheal_recreate_entry() tries
to create the entry again and it fails with EEXIST.

Fix:
We could have fixed posx_mknod/mkdir etc to assign the gfid if the file
already exists but the right thing to do seems to be to trigger a lookup
on the bad brick and let it heal the gfid instead of winding an
mknod/mkdir in the first place.

(cherry picked from commit 20fa80057eb430fd72b4fa31b9b65598b8ec1265)
Change-Id: I82f76665a7541f1893ef8d847b78af6466aff1ff
BUG: 1499202
Signed-off-by: Ravishankar N <ravishankar@redhat.com>

4 files changed, 120 insertions, 67 deletions

diff --git a/xlators/cluster/afr/src/afr-self-heal-common.c b/xlators/cluster/afr/src/afr-self-heal-common.c
index 55b978bf962..20e81dd43e0 100644
--- a/xlators/cluster/afr/src/afr-self-heal-common.c
+++ b/xlators/cluster/afr/src/afr-self-heal-common.c
@@ -20,6 +20,84 @@ void
 afr_heal_synctask (xlator_t *this, afr_local_t *local);
 
 int
+afr_lookup_and_heal_gfid (xlator_t *this, inode_t *parent, const char *name,
+                          inode_t *inode, struct afr_reply *replies,
+                          int source,  void *gfid)
+{
+        afr_private_t *priv = NULL;
+        call_frame_t   *frame    = NULL;
+        afr_local_t *local = NULL;
+        unsigned char *wind_on = NULL;
+        ia_type_t ia_type = IA_INVAL;
+        dict_t *xdata = NULL;
+        loc_t loc = {0, };
+        int ret = 0;
+        int i = 0;
+
+        priv = this->private;
+        wind_on = alloca0 (priv->child_count);
+        ia_type = replies[source].poststat.ia_type;
+
+        /* gfid heal on those subvolumes that do not have gfid associated
+         * with the inode and update those replies.
+         */
+        for (i = 0; i < priv->child_count; i++) {
+                if (!replies[i].valid || replies[i].op_ret != 0)
+                        continue;
+                if (!gf_uuid_is_null (replies[i].poststat.ia_gfid) ||
+                    replies[i].poststat.ia_type != ia_type)
+                        continue;
+
+                wind_on[i] = 1;
+        }
+
+        if (AFR_COUNT(wind_on, priv->child_count) == 0)
+                return 0;
+
+        xdata = dict_new ();
+        if (!xdata) {
+                ret = -ENOMEM;
+                goto out;
+        }
+
+        ret = dict_set_static_bin (xdata, "gfid-req", gfid, 16);
+        if (ret) {
+                ret = -ENOMEM;
+                goto out;
+        }
+
+        frame = afr_frame_create (this);
+        if (!frame) {
+                ret = -ENOMEM;
+                goto out;
+        }
+
+        local = frame->local;
+        loc.parent = inode_ref (parent);
+        gf_uuid_copy (loc.pargfid, parent->gfid);
+        loc.name = name;
+        loc.inode = inode_ref (inode);
+
+        AFR_ONLIST (wind_on, frame, afr_selfheal_discover_cbk, lookup,
+                    &loc, xdata);
+
+        for (i = 0; i < priv->child_count; i++) {
+                if (!wind_on[i])
+                        continue;
+                afr_reply_wipe (&replies[i]);
+                afr_reply_copy (&replies[i], &local->replies[i]);
+        }
+out:
+        loc_wipe (&loc);
+        if (frame)
+                AFR_STACK_DESTROY (frame);
+        if (xdata)
+                dict_unref (xdata);
+
+        return ret;
+}
+
+int
 afr_gfid_sbrain_source_from_src_brick (xlator_t *this,
                                        struct afr_reply *replies,
                                        char *src_brick)
diff --git a/xlators/cluster/afr/src/afr-self-heal-entry.c b/xlators/cluster/afr/src/afr-self-heal-entry.c
index afa3f9044e1..647dd71911b 100644
--- a/xlators/cluster/afr/src/afr-self-heal-entry.c
+++ b/xlators/cluster/afr/src/afr-self-heal-entry.c
@@ -64,7 +64,6 @@ afr_selfheal_entry_delete (xlator_t *this, inode_t *dir, const char *name,
 	return ret;
 }
 
-
 int
 afr_selfheal_recreate_entry (call_frame_t *frame, int dst, int source,
                              unsigned char *sources, inode_t *dir,
@@ -164,7 +163,6 @@ out:
 	return ret;
 }
 
-
 static int
 __afr_selfheal_heal_dirent (call_frame_t *frame, xlator_t *this, fd_t *fd,
 			    char *name, inode_t *inode, int source,
@@ -187,6 +185,14 @@ __afr_selfheal_heal_dirent (call_frame_t *frame, xlator_t *this, fd_t *fd,
             (replies[source].op_errno != ENOENT))
                 return -replies[source].op_errno;
 
+        if (replies[source].op_ret == 0) {
+                ret = afr_lookup_and_heal_gfid (this, fd->inode, name,
+                                                inode, replies, source,
+                                             &replies[source].poststat.ia_gfid);
+                if (ret)
+                        return ret;
+        }
+
 	for (i = 0; i < priv->child_count; i++) {
 		if (!healed_sinks[i])
 			continue;
@@ -223,8 +229,12 @@ afr_selfheal_detect_gfid_and_type_mismatch (xlator_t *this,
         int             i        = 0;
         int             ret      = -1;
         afr_private_t  *priv     = NULL;
+        void *gfid               = NULL;
+        ia_type_t ia_type        = IA_INVAL;
 
         priv = this->private;
+        gfid = &replies[src_idx].poststat.ia_gfid;
+        ia_type = replies[src_idx].poststat.ia_type;
 
         for (i = 0; i < priv->child_count; i++) {
                 if (i == src_idx)
@@ -236,8 +246,8 @@ afr_selfheal_detect_gfid_and_type_mismatch (xlator_t *this,
                 if (replies[i].op_ret != 0)
                         continue;
 
-                if (gf_uuid_compare (replies[src_idx].poststat.ia_gfid,
-                                     replies[i].poststat.ia_gfid)) {
+                if (gf_uuid_compare (gfid, replies[i].poststat.ia_gfid) &&
+                    (ia_type == replies[i].poststat.ia_type)) {
                         ret = afr_gfid_split_brain_source (this, replies, inode,
                                                            pargfid, bname,
                                                            src_idx, i,
@@ -251,8 +261,7 @@ afr_selfheal_detect_gfid_and_type_mismatch (xlator_t *this,
                         return ret;
                 }
 
-                if ((replies[src_idx].poststat.ia_type) !=
-                    (replies[i].poststat.ia_type)) {
+                if (ia_type != replies[i].poststat.ia_type) {
                         gf_msg (this->name, GF_LOG_ERROR, 0,
                                 AFR_MSG_SPLIT_BRAIN, "Type mismatch detected "
                                 "for <gfid:%s>/%s>, %s on %s and %s on %s. "
@@ -310,6 +319,12 @@ __afr_selfheal_merge_dirent (call_frame_t *frame, xlator_t *this, fd_t *fd,
 		}
 	}
 
+        ret = afr_lookup_and_heal_gfid (this, fd->inode, name, inode, replies,
+                                        source,
+                                        &replies[source].poststat.ia_gfid);
+        if (ret)
+                return ret;
+
         /* In case of type mismatch / unable to resolve gfid mismatch on the
          * entry, return -1.*/
         ret = afr_selfheal_detect_gfid_and_type_mismatch (this, replies, inode,
@@ -542,9 +557,19 @@ afr_selfheal_entry_dirent (call_frame_t *frame, xlator_t *this,
         struct afr_reply  *replies      = NULL;
         struct afr_reply  *par_replies  = NULL;
         afr_private_t     *priv         = NULL;
+        dict_t            *xattr        = NULL;
 
 	priv = this->private;
 
+        xattr = dict_new ();
+        if (!xattr)
+                return -ENOMEM;
+        ret = dict_set_int32 (xattr, GF_GFIDLESS_LOOKUP, 1);
+        if (ret) {
+                dict_unref (xattr);
+                return -1;
+        }
+
         sources = alloca0 (priv->child_count);
         sinks   = alloca0 (priv->child_count);
         healed_sinks = alloca0 (priv->child_count);
@@ -576,7 +601,7 @@ afr_selfheal_entry_dirent (call_frame_t *frame, xlator_t *this,
 
 		inode = afr_selfheal_unlocked_lookup_on (frame, fd->inode, name,
 							 replies, locked_on,
-                                                         NULL);
+                                                         xattr);
 		if (!inode) {
 			ret = -ENOMEM;
 			goto unlock;
@@ -608,6 +633,8 @@ unlock:
                 afr_replies_wipe (replies, priv->child_count);
         if (par_replies)
                 afr_replies_wipe (par_replies, priv->child_count);
+        if (xattr)
+                dict_unref (xattr);
 
 	return ret;
 }
diff --git a/xlators/cluster/afr/src/afr-self-heal-name.c b/xlators/cluster/afr/src/afr-self-heal-name.c
index 2aad4c75bee..352d151207e 100644
--- a/xlators/cluster/afr/src/afr-self-heal-name.c
+++ b/xlators/cluster/afr/src/afr-self-heal-name.c
@@ -18,50 +18,18 @@ int
 __afr_selfheal_assign_gfid (xlator_t *this, inode_t *parent, uuid_t pargfid,
                             const char *bname, inode_t *inode,
                             struct afr_reply *replies, void *gfid,
-                            unsigned char *locked_on,
+                            unsigned char *locked_on, int source,
                             gf_boolean_t is_gfid_absent)
 {
 	int             ret          = 0;
         int             up_count     = 0;
         int             locked_count = 0;
-        int             i            = 0;
 	afr_private_t  *priv         = NULL;
-	dict_t         *xdata        = NULL;
-	loc_t           loc          = {0, };
-        call_frame_t   *new_frame    = NULL;
-        afr_local_t    *new_local    = NULL;
-        unsigned char  *wind_on      = NULL;
 
 	priv = this->private;
-        wind_on = alloca0 (priv->child_count);
-
-        new_frame = afr_frame_create (this);
-        if (!new_frame) {
-                ret = -ENOMEM;
-                goto out;
-        }
-
-        new_local = new_frame->local;
 
 	gf_uuid_copy (parent->gfid, pargfid);
 
-	xdata = dict_new ();
-	if (!xdata) {
-                ret = -ENOMEM;
-		goto out;
-	}
-
-	ret = dict_set_static_bin (xdata, "gfid-req", gfid, 16);
-	if (ret) {
-		ret = -ENOMEM;
-		goto out;
-	}
-
-	loc.parent = inode_ref (parent);
-	loc.inode = inode_ref (inode);
-	gf_uuid_copy (loc.pargfid, pargfid);
-	loc.name = bname;
-
         if (is_gfid_absent) {
                 /* Ensure all children of AFR are up before performing gfid heal, to
                  * guard against the possibility of gfid split brain. */
@@ -79,34 +47,10 @@ __afr_selfheal_assign_gfid (xlator_t *this, inode_t *parent, uuid_t pargfid,
                 }
         }
 
-        /* gfid heal on those subvolumes that do not have gfid associated
-         * with the inode and update those replies.
-         */
-        for (i = 0; i < priv->child_count; i++) {
-                if (replies[i].valid && replies[i].op_ret == 0 &&
-                    !gf_uuid_is_null (replies[i].poststat.ia_gfid) &&
-                    !gf_uuid_compare (replies[i].poststat.ia_gfid, gfid))
-                        continue;
-                wind_on[i] = 1;
-        }
-
-        AFR_ONLIST (wind_on, new_frame, afr_selfheal_discover_cbk, lookup,
-                    &loc, xdata);
-
-        for (i = 0; i < priv->child_count; i++) {
-                if (!wind_on[i])
-                        continue;
-                afr_reply_wipe (&replies[i]);
-                afr_reply_copy (&replies[i], &new_local->replies[i]);
-        }
+        afr_lookup_and_heal_gfid (this, parent, bname, inode, replies, source,
+                                  gfid);
 
 out:
-	loc_wipe (&loc);
-        if (xdata)
-                dict_unref (xdata);
-        if (new_frame)
-                AFR_STACK_DESTROY (new_frame);
-
 	return ret;
 }
 
@@ -481,7 +425,7 @@ __afr_selfheal_name_do (call_frame_t *frame, xlator_t *this, inode_t *parent,
 
         is_gfid_absent = (gfid_idx == -1) ? _gf_true : _gf_false;
 	ret = __afr_selfheal_assign_gfid (this, parent, pargfid, bname, inode,
-                                          replies, gfid, locked_on,
+                                          replies, gfid, locked_on, source,
                                           is_gfid_absent);
         if (ret)
                 return ret;
diff --git a/xlators/cluster/afr/src/afr-self-heal.h b/xlators/cluster/afr/src/afr-self-heal.h
index f7c4695cd46..a1da4331fb7 100644
--- a/xlators/cluster/afr/src/afr-self-heal.h
+++ b/xlators/cluster/afr/src/afr-self-heal.h
@@ -110,6 +110,10 @@ afr_selfheal_metadata (call_frame_t *frame, xlator_t *this, inode_t *inode);
 int
 afr_selfheal_entry (call_frame_t *frame, xlator_t *this, inode_t *inode);
 
+int
+afr_lookup_and_heal_gfid (xlator_t *this, inode_t *parent, const char *name,
+                          inode_t *inode, struct afr_reply *replies, int source,
+                          void *gfid);
 
 int
 afr_selfheal_inodelk (call_frame_t *frame, xlator_t *this, inode_t *inode,