static bool io_match_link(struct io_kiocb *preq, struct io_kiocb *req)
{
	struct io_kiocb *link;

	if (!(preq->flags & REQ_F_LINK_HEAD))
		return false;

	list_for_each_entry(link, &preq->link_list, link_list) {
		if (link == req)
			return true;
	}

	return false;
}
static bool io_match_link(struct io_kiocb *preq, struct io_kiocb *req)
{
	struct io_kiocb *link;

	if (!(preq->flags & REQ_F_LINK_HEAD))
		return false;

	list_for_each_entry(link, &preq->link_list, link_list) {
		if (link == req)
			return true;
	}

	return false;
}