DHT/readdirp: Directory not shown/healed on mount point if exists

              on single brick(non first up subvolume).

Problem: If snapshot is taken, when mkdir has succeeded only on
hashed_subvolume, then after restoring snapshot the directory
is not shown on mount point.

Why:    dht_readdirp takes only those directory entries in to
account, which are present on first_up_subvolume. Hence, if the
"hashed subvolume" is not same as first_up_subvolume, it wont be listed
on mount point and also not healed.

Solution:
Case 1: (Rebalance not running)If hashed subvolume is NULL or down then
filter in first_up_subvolume. Other wise the corresponding hashed subvolume
will take care of the directory entry.

Case 2: If readdirp_optimize option is turned on then read from first_up_subvol

Change-Id: Idaad28f1c9f688dbfb1a8a3ab8b244510c02365e
BUG: 1139103
Signed-off-by: Susant Palai <spalai@redhat.com>
Reviewed-on: http://review.gluster.org/7599
Reviewed-by: Raghavendra G <rgowdapp@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>
(cherry picked from commit b8f3aab95f01ac7d590a5ba490e890d9cf8c2e50)
Signed-off-by: Nithya Balachandran <nbalacha@redhat.com>
Reviewed-on: http://review.gluster.org/8713
Reviewed-by: Jeff Darcy <jdarcy@redhat.com>
Reviewed-by: Niels de Vos <ndevos@redhat.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/xlators/cluster/dht/src/dht-helper.c b/xlators/cluster/dht/src/dht-helper.c
index eb6cd67c981..5d777394523 100644
--- a/xlators/cluster/dht/src/dht-helper.c
+++ b/xlators/cluster/dht/src/dht-helper.c
@@ -1164,3 +1164,16 @@ int dht_inode_ctx_set (inode_t *inode, xlator_t *this, dht_inode_ctx_t *ctx)
 out:
         return ret;
 }
+
+int
+dht_subvol_status (dht_conf_t *conf, xlator_t *subvol)
+{
+        int i;
+
+        for (i=0 ; i < conf->subvolume_cnt; i++) {
+                if (conf->subvolumes[i] == subvol) {
+                        return conf->subvolume_status[i];
+                }
+        }
+        return 0;
+}