glusterd: mount directory getting truncated on mounting shared_storage

Issue:
In case of a user created volume the mount point
is the brick path 'ex: /data/brick' but in case of
shared_storage the mount point is '/'.So, here
we increment the array by one so as to get the exact
path of brick without '/', which works fine for other
volumes as the pointer of the brick_dir variable is
at '/', but for shared_storage it is at 'v'(where v is
starting letter of 'var' directory). So, on incrementing
the path we get in case of shared_storage starts from
'ar/lib/glusterd/...'

Fix:
Only, increment the pointer if the current position is '/',
else the path will be wrong.

Fixes: gluster#1480

Change-Id: Id31bb13f58134ae2099884fbc5984c4e055fb357
Signed-off-by: nik-redhat <[email protected]>

xlators/mgmt/glusterd/src/glusterd-utils.c

@@ -1125,7 +1125,8 @@ glusterd_get_brick_mount_dir(char *brickpath, char *hostname, char *mount_dir)
         }
 
         brick_dir = &brickpath[strlen(mnt_pt)];
-        brick_dir++;
+        if (brick_dir[0] == '/')
+            brick_dir++;
 
         snprintf(mount_dir, VALID_GLUSTERD_PATHMAX, "/%s", brick_dir);
     }