LU-4596 lprocfs: mdt/*/exports/*/uuid is empty after remount

need to assign exp_nid_stats even if old stats are present

Change-Id: I9b0ac4c7ccee6cbd457827b20123bf40d91aaf33
Xyratex-bug-id: MRP-1641
Signed-off-by: Andriy Skulysh <Andriy_Skulysh@xyratex.com>
Reviewed-on: http://review.whamcloud.com/9171
Reviewed-by: Lai Siyao <lai.siyao@intel.com>
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Emoly Liu <emoly.liu@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>

diff --git a/lustre/obdclass/lprocfs_status.c b/lustre/obdclass/lprocfs_status.c
index 29604ff..9956ada 100644 (file)
--- a/lustre/obdclass/lprocfs_status.c
+++ b/lustre/obdclass/lprocfs_status.c
@@ -2848,7 +2848,13 @@ int lprocfs_exp_setup(struct obd_export *exp, lnet_nid_t *nid, int *newnid)
        /* Return -EALREADY here so that we know that the /proc
         * entry already has been created */
        if (old_stat != new_stat) {
-               nidstat_putref(old_stat);
+               spin_lock(&exp->exp_lock);
+               if (exp->exp_nid_stats) {
+                       LASSERT(exp->exp_nid_stats == old_stat);
+                       nidstat_putref(exp->exp_nid_stats);
+               }
+               exp->exp_nid_stats = old_stat;
+               spin_unlock(&exp->exp_lock);
                GOTO(destroy_new, rc = -EALREADY);
        }
         /* not found - create */