cluster/afr: Don't lookup/forget inodes

Problem:
All inodes that are looked-up are always forgotten without fail in
afr removing the benefits of them being in lru. This same code can
cause crashes if between inode_lookup, inode_forget in afr if the
top xlator does inode_forget(0).

Fix:
Don't use lookup/forget in afr. No benefits are there at the moment
for keeping this code. It is impossible to prevent top xlators to
do inode_forget(0). Found similar instances in ec
and removed them even though those code paths are not going to
be executed in any place other than heal-daemon.

BUG: 1321554
Change-Id: Ia4cb236178f7f129cc898d53f0bbd26f494a2a8d
Signed-off-by: Pranith Kumar K <pkarampu@redhat.com>
Reviewed-on: http://review.gluster.org/13834
Smoke: Gluster Build System <jenkins@build.gluster.com>
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
CentOS-regression: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Anuradha Talur <atalur@redhat.com>

4 files changed, 5 insertions, 32 deletions

diff --git a/xlators/cluster/afr/src/afr-common.c b/xlators/cluster/afr/src/afr-common.c
index 8c04cfbff2f..f4d74c57a5d 100644
--- a/xlators/cluster/afr/src/afr-common.c
+++ b/xlators/cluster/afr/src/afr-common.c
@@ -1948,12 +1948,11 @@ afr_lookup_sh_metadata_wrap (void *opaque)
         if (first == -1)
                 goto out;
 
-        inode = afr_inode_link (local->inode,&replies[first].poststat);
+        inode = inode_link (local->inode, NULL, NULL, &replies[first].poststat);
         if(!inode)
                 goto out;
 
         afr_selfheal_metadata (frame, this, inode);
-        inode_forget (inode, 1);
         inode_unref (inode);
 
         afr_local_replies_wipe (local, this->private);
@@ -4834,10 +4833,8 @@ out:
         AFR_STACK_UNWIND (getxattr, frame, ret, op_errno, dict, NULL);
         if (dict)
                dict_unref (dict);
-        if (inode) {
-                inode_forget (inode, 1);
+        if (inode)
                 inode_unref (inode);
-        }
         GF_FREE (substr);
         return ret;
 }
diff --git a/xlators/cluster/afr/src/afr-self-heal-common.c b/xlators/cluster/afr/src/afr-self-heal-common.c
index 151960d2516..3f4e9703546 100644
--- a/xlators/cluster/afr/src/afr-self-heal-common.c
+++ b/xlators/cluster/afr/src/afr-self-heal-common.c
@@ -1153,20 +1153,6 @@ afr_is_entry_set (xlator_t *this, dict_t *xdata)
 	return afr_is_pending_set (this, xdata, AFR_ENTRY_TRANSACTION);
 }
 
-
-inode_t*
-afr_inode_link (inode_t *inode, struct iatt *iatt)
-{
-	inode_t *linked_inode = NULL;
-
-	linked_inode = inode_link (inode, NULL, NULL, iatt);
-
-	if (linked_inode)
-		inode_lookup (linked_inode);
-        return linked_inode;
-}
-
-
 /*
  * This function inspects the looked up replies (in an unlocked manner)
  * and decides whether a locked verification and possible healing is
@@ -1293,7 +1279,7 @@ afr_selfheal_unlocked_inspect (call_frame_t *frame, xlator_t *this,
 	}
 
 	if (valid_cnt > 0 && link_inode) {
-		*link_inode = afr_inode_link (inode, &first);
+		*link_inode = inode_link (inode, NULL, NULL, &first);
                 if (!*link_inode) {
                         ret = -EINVAL;
                         goto out;
@@ -1454,10 +1440,8 @@ afr_selfheal_do (call_frame_t *frame, xlator_t *this, uuid_t gfid)
                 ret = 0;
 
 out:
-        if (inode) {
-                inode_forget (inode, 1);
+        if (inode)
                 inode_unref (inode);
-        }
         return ret;
 }
 /*
diff --git a/xlators/cluster/afr/src/afr-self-heal.h b/xlators/cluster/afr/src/afr-self-heal.h
index b0f545f2816..0bee7a023ad 100644
--- a/xlators/cluster/afr/src/afr-self-heal.h
+++ b/xlators/cluster/afr/src/afr-self-heal.h
@@ -189,9 +189,6 @@ afr_selfheal_newentry_mark (call_frame_t *frame, xlator_t *this, inode_t *inode,
                             int source, struct afr_reply *replies,
                             unsigned char *sources, unsigned char *newentry);
 
-inode_t*
-afr_inode_link (inode_t *inode, struct iatt *iatt);
-
 unsigned int
 afr_success_count (struct afr_reply *replies, unsigned int count);
 
diff --git a/xlators/cluster/afr/src/afr-self-heald.c b/xlators/cluster/afr/src/afr-self-heald.c
index 228ea388662..9439bba63ff 100644
--- a/xlators/cluster/afr/src/afr-self-heald.c
+++ b/xlators/cluster/afr/src/afr-self-heald.c
@@ -159,10 +159,8 @@ afr_shd_inode_find (xlator_t *this, xlator_t *subvol, uuid_t gfid)
 	struct iatt iatt = {0, };
 
 	inode = inode_find (this->itable, gfid);
-	if (inode) {
-                inode_lookup (inode);
+	if (inode)
 		goto out;
-        }
 
 	loc.inode = inode_new (this->itable);
 	if (!loc.inode)
@@ -174,8 +172,6 @@ afr_shd_inode_find (xlator_t *this, xlator_t *subvol, uuid_t gfid)
 		goto out;
 
 	inode = inode_link (loc.inode, NULL, NULL, &iatt);
-	if (inode)
-		inode_lookup (inode);
 out:
 	loc_wipe (&loc);
 	return inode;
@@ -444,7 +440,6 @@ afr_shd_index_sweep (struct subvol_healer *healer, char *vgfid)
         ret = syncop_dir_scan (subvol, &loc, GF_CLIENT_PID_SELF_HEALD,
                                healer, afr_shd_index_heal);
 
-        inode_forget (loc.inode, 1);
         loc_wipe (&loc);
 
         if (ret == 0)