summaryrefslogtreecommitdiffstats
path: root/io_uring/poll.h
blob: 1dacae9e816c9269e8a1ae5bfab4d12fa9aaa9ac (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
// SPDX-License-Identifier: GPL-2.0

#include "alloc_cache.h"

enum {
	IO_APOLL_OK,
	IO_APOLL_ABORTED,
	IO_APOLL_READY
};

struct io_poll {
	struct file			*file;
	struct wait_queue_head		*head;
	__poll_t			events;
	int				retries;
	struct wait_queue_entry		wait;
};

struct async_poll {
	union {
		struct io_poll		poll;
		struct io_cache_entry	cache;
	};
	struct io_poll		*double_poll;
};

/*
 * Must only be called inside issue_flags & IO_URING_F_MULTISHOT, or
 * potentially other cases where we already "own" this poll request.
 */
static inline void io_poll_multishot_retry(struct io_kiocb *req)
{
	atomic_inc(&req->poll_refs);
}

int io_poll_add_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
int io_poll_add(struct io_kiocb *req, unsigned int issue_flags);

int io_poll_remove_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
int io_poll_remove(struct io_kiocb *req, unsigned int issue_flags);

struct io_cancel_data;
int io_poll_cancel(struct io_ring_ctx *ctx, struct io_cancel_data *cd,
		   unsigned issue_flags);
int io_arm_poll_handler(struct io_kiocb *req, unsigned issue_flags);
bool io_poll_remove_all(struct io_ring_ctx *ctx, struct task_struct *tsk,
			bool cancel_all);

void io_apoll_cache_free(struct io_cache_entry *entry);

void io_poll_task_func(struct io_kiocb *req, struct io_tw_state *ts);