2396 int btrfs_backref_iter_start(struct btrfs_backref_iter *iter, u64 bytenr)  argument
2398 	struct btrfs_fs_info *fs_info = iter->fs_info;
2399 	struct btrfs_path *path = iter->path;
2407 	iter->bytenr = bytenr;
2429 	memcpy(&iter->cur_key, &key, sizeof(key));
2430 	iter->item_ptr = (u32)btrfs_item_ptr_offset(path->nodes[0],
2432 	iter->end_ptr = (u32)(iter->item_ptr +
2448 	iter->cur_ptr = (u32)(iter->item_ptr + sizeof(*ei));
2451 	if (iter->cur_ptr >= iter->end_ptr) {
2462 		btrfs_item_key_to_cpu(path->nodes[0], &iter->cur_key,
2464 		if (iter->cur_key.objectid != bytenr ||
2465 		    (iter->cur_key.type != BTRFS_SHARED_BLOCK_REF_KEY &&
2466 		     iter->cur_key.type != BTRFS_TREE_BLOCK_REF_KEY)) {
2470 		iter->cur_ptr = (u32)btrfs_item_ptr_offset(path->nodes[0],
2472 		iter->item_ptr = iter->cur_ptr;
2473 		iter->end_ptr = (u32)(iter->item_ptr + btrfs_item_size_nr(
2479 	btrfs_backref_iter_release(iter);
2493 int btrfs_backref_iter_next(struct btrfs_backref_iter *iter)  argument
2495 	struct extent_buffer *eb = btrfs_backref_get_eb(iter);
2496 	struct btrfs_path *path = iter->path;
2501 	if (btrfs_backref_iter_is_inline_ref(iter)) {
2503 		ASSERT(iter->cur_ptr < iter->end_ptr);
2505 		if (btrfs_backref_has_tree_block_info(iter)) {
2513 				((unsigned long)iter->cur_ptr);
2518 		iter->cur_ptr += size;
2519 		if (iter->cur_ptr < iter->end_ptr)
2526 	ret = btrfs_next_item(iter->fs_info->extent_root, iter->path);
2530 	btrfs_item_key_to_cpu(path->nodes[0], &iter->cur_key, path->slots[0]);
2531 	if (iter->cur_key.objectid != iter->bytenr ||
2532 	    (iter->cur_key.type != BTRFS_TREE_BLOCK_REF_KEY &&
2533 	     iter->cur_key.type != BTRFS_SHARED_BLOCK_REF_KEY))
2535 	iter->item_ptr = (u32)btrfs_item_ptr_offset(path->nodes[0],
2537 	iter->cur_ptr = iter->item_ptr;
2538 	iter->end_ptr = iter->item_ptr + (u32)btrfs_item_size_nr(path->nodes[0],
2915 				struct btrfs_backref_iter *iter,  argument
2924 	ret = btrfs_backref_iter_start(iter, cur->bytenr);
2931 	if (btrfs_backref_has_tree_block_info(iter)) {
2932 		ret = btrfs_backref_iter_next(iter);
2962 	for (; ret == 0; ret = btrfs_backref_iter_next(iter)) {
2968 		eb = btrfs_backref_get_eb(iter);
2970 		key.objectid = iter->bytenr;
2971 		if (btrfs_backref_iter_is_inline_ref(iter)) {
2976 				((unsigned long)iter->cur_ptr);
2986 			key.type = iter->cur_key.type;
2987 			key.offset = iter->cur_key.offset;
3032 	btrfs_backref_iter_release(iter);