walk_down_tree   5312 fs/btrfs/extent-tree.c 		ret = walk_down_tree(trans, root, path, wc);
walk_down_tree   5478 fs/btrfs/extent-tree.c 		wret = walk_down_tree(trans, root, path, wc);
walk_down_tree   1005 fs/btrfs/ref-verify.c 		ret = walk_down_tree(fs_info->extent_root, path, level,