// SPDX-License-Identifier: GPL-2.0 #define IO_POLL_ALLOC_CACHE_MAX 32 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 {	struct io_poll		poll;	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 io_uring_task *tctx,			bool cancel_all); void io_poll_task_func(struct io_kiocb *req, struct io_tw_state *ts);