191 	while (!list_empty(&node->upper)) {  in walk_up_backref()
192 		edge = list_entry(node->upper.next,  in walk_up_backref()
215 		if (list_is_last(&edge->list[LOWER], &lower->upper)) {  in walk_down_backref()
399 		ASSERT(list_empty(&cur->upper));  in handle_useless_nodes()
423 			if (list_empty(&lower->upper))  in handle_useless_nodes()
607 				      &new_edge->node[LOWER]->upper);  in clone_backref_node()
2326 			if (list_empty(&next->upper))  in calcu_metadata_size()
2329 			edge = list_entry(next->upper.next,  in calcu_metadata_size()
2393 	struct btrfs_backref_node *upper;  in do_relocation()  local
2411 	list_for_each_entry(edge, &node->upper, list[LOWER]) {  in do_relocation()
2416 		upper = edge->node[UPPER];  in do_relocation()
2417 		root = select_reloc_root(trans, rc, upper, edges);  in do_relocation()
2423 		if (upper->eb && !upper->locked) {  in do_relocation()
2425 				ret = btrfs_bin_search(upper->eb, key, &slot);  in do_relocation()
2429 				bytenr = btrfs_node_blockptr(upper->eb, slot);  in do_relocation()
2433 			btrfs_backref_drop_node_buffer(upper);  in do_relocation()
2436 		if (!upper->eb) {  in do_relocation()
2446 			if (!upper->eb) {  in do_relocation()
2447 				upper->eb = path->nodes[upper->level];  in do_relocation()
2448 				path->nodes[upper->level] = NULL;  in do_relocation()
2450 				BUG_ON(upper->eb != path->nodes[upper->level]);  in do_relocation()
2453 			upper->locked = 1;  in do_relocation()
2454 			path->locks[upper->level] = 0;  in do_relocation()
2456 			slot = path->slots[upper->level];  in do_relocation()
2459 			ret = btrfs_bin_search(upper->eb, key, &slot);  in do_relocation()
2465 		bytenr = btrfs_node_blockptr(upper->eb, slot);  in do_relocation()
2471 					  upper->eb->start);  in do_relocation()
2481 		eb = btrfs_read_node_slot(upper->eb, slot);  in do_relocation()
2489 			ret = btrfs_cow_block(trans, root, eb, upper->eb,  in do_relocation()
2501 			btrfs_set_node_blockptr(upper->eb, slot,  in do_relocation()
2503 			btrfs_set_node_ptr_generation(upper->eb, slot,  in do_relocation()
2505 			btrfs_mark_buffer_dirty(upper->eb);  in do_relocation()
2509 					       upper->eb->start);  in do_relocation()
2511 					    btrfs_header_owner(upper->eb),  in do_relocation()
2516 							 upper->eb);  in do_relocation()
2521 		if (!upper->pending)  in do_relocation()
2522 			btrfs_backref_drop_node_buffer(upper);  in do_relocation()
2524 			btrfs_backref_unlock_node_buffer(upper);  in do_relocation()
2604 			if (list_empty(&next->upper))  in update_processed_blocks()
2607 			edge = list_entry(next->upper.next,  in update_processed_blocks()