static void io_attempt_cancel(struct io_ring_ctx *ctx, struct io_kiocb *req)
{
	enum io_wq_cancel cret;

	/* cancel this particular work, if it's running */
	cret = io_wq_cancel_work(ctx->io_wq, &req->work);
	if (cret != IO_WQ_CANCEL_NOTFOUND)
		return;

	/* find links that hold this pending, cancel those */
	cret = io_wq_cancel_cb(ctx->io_wq, io_cancel_link_cb, req, true);
	if (cret != IO_WQ_CANCEL_NOTFOUND)
		return;

	/* if we have a poll link holding this pending, cancel that */
	if (io_poll_remove_link(ctx, req))
		return;

	/* final option, timeout link is holding this req pending */
	io_timeout_remove_link(ctx, req);
}
static void io_attempt_cancel(struct io_ring_ctx *ctx, struct io_kiocb *req)
{
	enum io_wq_cancel cret;

	 
	cret = io_wq_cancel_work(ctx->io_wq, &req->work);
	if (cret != IO_WQ_CANCEL_NOTFOUND)
		return;

	 
	cret = io_wq_cancel_cb(ctx->io_wq, io_cancel_link_cb, req, true);
	if (cret != IO_WQ_CANCEL_NOTFOUND)
		return;

	 
	if (io_poll_remove_link(ctx, req))
		return;

	 
	io_timeout_remove_link(ctx, req);
}