ocfs2: recheck lockres master before sending an unlock request.

Recovery may have happened and it may now be mastered locally.
Signed-off-by: Kurt Hackel <kurt.hackel@oracle.com>
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>

fs/ocfs2/dlm/dlmunlock.c

@@ -317,6 +317,16 @@ static enum dlm_status dlm_send_remote_unlock_request(struct dlm_ctxt *dlm,
 	size_t veclen = 1;
 
 	mlog_entry("%.*s\n", res->lockname.len, res->lockname.name);
+			
+	if (owner == dlm->node_num) {
+		/* ended up trying to contact ourself.  this means
+		 * that the lockres had been remote but became local
+		 * via a migration.  just retry it, now as local */
+		mlog(0, "%s:%.*s: this node became the master due to a "
+		     "migration, re-evaluate now\n", dlm->name,
+		     res->lockname.len, res->lockname.name);
+		return DLM_FORWARD;
+	}
 
 	memset(&unlock, 0, sizeof(unlock));
 	unlock.node_idx = dlm->node_num;