root_uiter       1908 fs/btrfs/backref.c 	struct ulist_iterator root_uiter;
root_uiter       1941 fs/btrfs/backref.c 		ULIST_ITER_INIT(&root_uiter);
root_uiter       1942 fs/btrfs/backref.c 		while (!ret && (root_node = ulist_next(roots, &root_uiter))) {