drop_delayed_ref  460 fs/btrfs/delayed-ref.c 		drop_delayed_ref(trans, delayed_refs, head, next);
drop_delayed_ref  463 fs/btrfs/delayed-ref.c 			drop_delayed_ref(trans, delayed_refs, head, ref);
drop_delayed_ref  635 fs/btrfs/delayed-ref.c 		drop_delayed_ref(trans, root, href, exist);