ocfs2: temporarily disable automatic lock migration

Now we never change the owner of a lock resource until unmount or node
death. This will be re-enabled once some issues in the algorithm used have
been resolved.
Signed-off-by: Kurt Hackel <kurt.hackel@oracle.com>
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>

fs/ocfs2/dlm/dlmlock.c

@@ -227,14 +227,18 @@ static enum dlm_status dlmlock_remote(struct dlm_ctxt *dlm,
 	res->state &= ~DLM_LOCK_RES_IN_PROGRESS;
 	lock->lock_pending = 0;
 	if (status != DLM_NORMAL) {
-		if (status != DLM_NOTQUEUED)
+		if (status != DLM_NOTQUEUED) {
+			/*
+			 * DO NOT call calc_usage, as this would unhash
+			 * the remote lockres before we ever get to use
+			 * it.  treat as if we never made any change to
+			 * the lockres.
+			 */
+			lockres_changed = 0;
 			dlm_error(status);
+		}
 		dlm_revert_pending_lock(res, lock);
 		dlm_lock_put(lock);
-		/* do NOT call calc_usage, as this would unhash the remote
-		 * lockres before we ever get to use it.  treat as if we
-		 * never made any change to the lockres. */
-		lockres_changed = 0;
 	} else if (dlm_is_recovery_lock(res->lockname.name, 
 					res->lockname.len)) {
 		/* special case for the $RECOVERY lock.

fs/ocfs2/dlm/dlmthread.c

@@ -106,6 +106,20 @@ void __dlm_lockres_calc_usage(struct dlm_ctxt *dlm,
 	assert_spin_locked(&res->spinlock);
 
 	if (__dlm_lockres_unused(res)){
+		/* For now, just keep any resource we master */
+		if (res->owner == dlm->node_num)
+		{
+			if (!list_empty(&res->purge)) {
+				mlog(0, "we master %s:%.*s, but it is on "
+				     "the purge list.  Removing\n",
+				     dlm->name, res->lockname.len,
+				     res->lockname.name);
+				list_del_init(&res->purge);
+				dlm->purge_count--;
+			}
+			return;
+		}
+
 		if (list_empty(&res->purge)) {
 			mlog(0, "putting lockres %.*s from purge list\n",
 			     res->lockname.len, res->lockname.name);