poll.h

 1// SPDX-License-Identifier: GPL-2.0
 2
 3#include <linux/io_uring_types.h>
 4
 5#define IO_POLL_ALLOC_CACHE_MAX 32
 6
 7enum {
 8	IO_APOLL_OK,
 9	IO_APOLL_ABORTED,
10	IO_APOLL_READY
11};
12
13struct io_poll {
14	struct file			*file;
15	struct wait_queue_head		*head;
16	__poll_t			events;
17	int				retries;
18	struct wait_queue_entry		wait;
19};
20
21struct async_poll {
22	struct io_poll		poll;
23	struct io_poll		*double_poll;
24};
25
26/*
27 * Must only be called inside issue_flags & IO_URING_F_MULTISHOT, or
28 * potentially other cases where we already "own" this poll request.
29 */
30static inline void io_poll_multishot_retry(struct io_kiocb *req)
31{
32	atomic_inc(&req->poll_refs);
33}
34
35int io_poll_add_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
36int io_poll_add(struct io_kiocb *req, unsigned int issue_flags);
37
38int io_poll_remove_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
39int io_poll_remove(struct io_kiocb *req, unsigned int issue_flags);
40
41struct io_cancel_data;
42int io_poll_cancel(struct io_ring_ctx *ctx, struct io_cancel_data *cd,
43		   unsigned issue_flags);
44int io_arm_apoll(struct io_kiocb *req, unsigned issue_flags, __poll_t mask);
45int io_arm_poll_handler(struct io_kiocb *req, unsigned issue_flags);
46bool io_poll_remove_all(struct io_ring_ctx *ctx, struct io_uring_task *tctx,
47			bool cancel_all);
48
49void io_poll_task_func(struct io_tw_req tw_req, io_tw_token_t tw);