protocol/server: Relax lktable finodelk del_locker check

Problem:
Client xlator issues finodelk using anon-fd when the fd is not
opened on the file. This can also happen between attempts to re-open
the file after client disconnects. It can so happen that lock is taken
using anon-fd and the file is now re-opened and unlock would come with
re-opened fd. This will lead to leak in lk-table entry, which also
holds reference to fd which leads to fd-leak on the brick.

Fix:
Don't check for fds to be equal for tracking finodelks.
Since inodelk is identified by (gfid, connection, lk-owner)
fd equality is not needed.

Change-Id: I62152d84caef0b863c973845e618076d388e6848
BUG: 993247
Signed-off-by: Pranith Kumar K <pkarampu@redhat.com>
Reviewed-on: http://review.gluster.org/5499
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Anand Avati <avati@redhat.com>

2 files changed, 9 insertions, 1 deletions

diff --git a/libglusterfs/src/lock-table.c b/libglusterfs/src/lock-table.c
index a2fff2e3..42b7ed8a 100644
--- a/libglusterfs/src/lock-table.c
+++ b/libglusterfs/src/lock-table.c
@@ -97,7 +97,12 @@ gf_del_locker (struct _lock_table *table, const char *volume,
                             strcmp (locker->volume, volume))
                                 continue;
 
-                        if (locker->fd && fd && (locker->fd == fd))
+                        /*
+                         * 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))
diff --git a/tests/bugs/bug-821056.t b/tests/bugs/bug-821056.t
index 0c937cee..5e81541a 100644
--- a/tests/bugs/bug-821056.t
+++ b/tests/bugs/bug-821056.t
@@ -8,6 +8,7 @@ TEST glusterd
 TEST pidof glusterd
 
 TEST $CLI volume create $V0 replica 2 $H0:$B0/${V0}{0,1}
+TEST $CLI volume set $V0 eager-lock off
 TEST $CLI volume set $V0 cluster.self-heal-daemon off
 TEST $CLI volume set $V0 performance.quick-read off
 TEST $CLI volume set $V0 performance.open-behind off
@@ -46,4 +47,6 @@ EXPECT_WITHIN 20 "Y" gf_check_file_opened_in_brick $V0 $H0 $B0/${V0}0 $B0/${V0}0
 #close the fd
 exec 5>&-
 
+#Check that anon-fd based file is not leaking.
+EXPECT_WITHIN 20 "N" gf_check_file_opened_in_brick $V0 $H0 $B0/${V0}0 "$realpath"
 cleanup;