protocol/server: use different dict for resolving

                 Backport of http://review.gluster.org/11661

protocol/server has to resolve the inode before continuing with any fop coming
from the clients. For resolving it, server xlator was using the same dict
associated with the fop. It causes problems in some situations.

If a directory's inode was forgotten because of lru limit being exceeded, then
when a create fop comes for an entry within that directory, server tries to
resolve it. But since the parent directory's inode is not found in the inode
table, it tries to do a hard resolve by doing a lookup on the parent gfid.

If any xlator below server wants to get some extended attributes whenever
lookup comes, then they set the new keys in the same dict that came along with
the create fop. Now, the lookup of the parent succeeds and the create fop
proceeds with the same dict (with extra keys present). posix xlaror creates
those xattrs that are present in the dict. Thus the xattrs which were not to
be present by default are also set as part of create. (Ex: bit-rot related
xattrs such as bad-file, version and sign xattrs)

Change-Id: I62b0b012b0af3c92df6fced61f87dd0b6b015d4c
BUG: 1244100
Signed-off-by: Raghavendra Bhat <raghavendra@redhat.com>
Reviewed-on: http://review.gluster.org/11703
Tested-by: NetBSD Build System <jenkins@build.gluster.org>
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Raghavendra G <rgowdapp@redhat.com>

1 files changed, 24 insertions, 2 deletions

diff --git a/xlators/protocol/server/src/server-resolve.c b/xlators/protocol/server/src/server-resolve.c
index a7da519488d..906dc00acf5 100644
--- a/xlators/protocol/server/src/server-resolve.c
+++ b/xlators/protocol/server/src/server-resolve.c
@@ -106,6 +106,7 @@ resolve_gfid_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
         server_resolve_t     *resolve = NULL;
         inode_t              *link_inode = NULL;
         loc_t                *resolve_loc = NULL;
+        dict_t               *dict = NULL;
 
         state = CALL_STATE (frame);
         resolve = state->resolve_now;
@@ -166,10 +167,19 @@ resolve_gfid_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
         inode_path (resolve_loc->parent, resolve_loc->name,
                     (char **) &resolve_loc->path);
 
+        dict = dict_copy_with_ref (state->xdata, NULL);
+        if (!dict && state->xdata)
+                gf_msg (this->name, GF_LOG_ERROR, ENOMEM, PS_MSG_NO_MEMORY,
+                        "BUG: dict allocation failed (pargfid: %s, name: %s), "
+                        "still continuing", uuid_utoa (resolve_loc->gfid),
+                        resolve_loc->name);
+
         STACK_WIND (frame, resolve_gfid_entry_cbk,
                     frame->root->client->bound_xl,
                     frame->root->client->bound_xl->fops->lookup,
-                    &resolve->resolve_loc, state->xdata);
+                    &resolve->resolve_loc, dict);
+        if (dict)
+                dict_unref (dict);
         return 0;
 out:
         resolve_continue (frame);
@@ -185,6 +195,7 @@ resolve_gfid (call_frame_t *frame)
         server_resolve_t     *resolve = NULL;
         loc_t                *resolve_loc = NULL;
         int                   ret = 0;
+        dict_t               *xdata = NULL;
 
         state = CALL_STATE (frame);
         this  = frame->this;
@@ -199,10 +210,21 @@ resolve_gfid (call_frame_t *frame)
         resolve_loc->inode = inode_new (state->itable);
         ret = loc_path (resolve_loc, NULL);
 
+        xdata = dict_copy_with_ref (state->xdata, NULL);
+        if (!xdata && state->xdata)
+                gf_msg (this->name, GF_LOG_ERROR, ENOMEM, PS_MSG_NO_MEMORY,
+                        "BUG: dict allocation failed (gfid: %s), "
+                        "still continuing",
+                        uuid_utoa (resolve_loc->gfid));
+
         STACK_WIND (frame, resolve_gfid_cbk,
                     frame->root->client->bound_xl,
                     frame->root->client->bound_xl->fops->lookup,
-                    &resolve->resolve_loc, state->xdata);
+                    &resolve->resolve_loc, xdata);
+
+        if (xdata)
+                dict_unref (xdata);
+
         return 0;
 }