insert_before
insert_before(list, tmp, iodev);
insert_before(&parent->is_children,
insert_before(&ss->s_iodevs, entry,
insert_before(&parent->is_children,
insert_before(&ss->s_iodevs,
int insert_before;
insert_before = 0;
insert_before = 1;
} else if (insert_before) {