[PATCH] loop deadlock fix

This chunk is present in 2.4, missing in 2.5.  It
stops the loop thread from waiting on its owm buffers.

fs/buffer.c

@@ -995,7 +995,7 @@ static int balance_dirty_state(void)
 
 	/* First, check for the "real" dirty limit. */
 	if (dirty > soft_dirty_limit) {
-		if (dirty > hard_dirty_limit)
+		if (dirty > hard_dirty_limit && !(current->flags & PF_NOIO))
 			return 1;
 		return 0;
 	}