io_uring/poll.h

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