Btrfs: try to allocate from cluster even at LOOP_NO_EMPTY_SIZE

		spin_unlock(&block_group->free_space_ctl->tree_lock);

		/*

		 * Ok we want to try and use the cluster allocator, so lets look

		 * there, unless we are on LOOP_NO_EMPTY_SIZE, since we will

		 * have tried the cluster allocator plenty of times at this

		 * point and not have found anything, so we are likely way too

		 * fragmented for the clustering stuff to find anything, so lets

		 * just skip it and let the allocator find whatever block it can

		 * find

		 */

		if (last_ptr && loop < LOOP_NO_EMPTY_SIZE) {

		 * Ok we want to try and use the cluster allocator, so

		 * lets look there

		 */

		if (last_ptr) {

			/*

			 * the refill lock keeps out other

			 * people trying to start a new cluster

			}

			spin_unlock(&last_ptr->lock);

refill_cluster:

			/* If we are on LOOP_NO_EMPTY_SIZE, we can't

			 * set up a new clusters, so lets just skip it

			 * and let the allocator find whatever block

			 * it can find.  If we reach this point, we

			 * will have tried the cluster allocator

			 * plenty of times and not have found

			 * anything, so we are likely way too

			 * fragmented for the clustering stuff to find

			 * anything.  */

			if (loop >= LOOP_NO_EMPTY_SIZE) {

				spin_unlock(&last_ptr->refill_lock);

				goto unclustered_alloc;

			}

			/*

			 * this cluster didn't work out, free it and

			 * start over

			goto loop;

		}

unclustered_alloc:

		offset = btrfs_find_space_for_alloc(block_group, search_start,

						    num_bytes, empty_size);

		/*