rw.h

 1// SPDX-License-Identifier: GPL-2.0
 2
 3#include <linux/io_uring_types.h>
 4#include <linux/pagemap.h>
 5
 6struct io_meta_state {
 7	u32			seed;
 8	struct iov_iter_state	iter_meta;
 9};
10
11struct io_async_rw {
12	struct iou_vec			vec;
13	size_t				bytes_done;
14
15	struct_group(clear,
16		struct iov_iter			iter;
17		struct iov_iter_state		iter_state;
18		struct iovec			fast_iov;
19		unsigned			buf_group;
20
21		/*
22		 * wpq is for buffered io, while meta fields are used with
23		 * direct io
24		 */
25		union {
26			struct wait_page_queue		wpq;
27			struct {
28				struct uio_meta			meta;
29				struct io_meta_state		meta_state;
30			};
31		};
32	);
33};
34
35int io_prep_read_fixed(struct io_kiocb *req, const struct io_uring_sqe *sqe);
36int io_prep_write_fixed(struct io_kiocb *req, const struct io_uring_sqe *sqe);
37int io_prep_readv_fixed(struct io_kiocb *req, const struct io_uring_sqe *sqe);
38int io_prep_writev_fixed(struct io_kiocb *req, const struct io_uring_sqe *sqe);
39int io_prep_readv(struct io_kiocb *req, const struct io_uring_sqe *sqe);
40int io_prep_writev(struct io_kiocb *req, const struct io_uring_sqe *sqe);
41int io_prep_read(struct io_kiocb *req, const struct io_uring_sqe *sqe);
42int io_prep_write(struct io_kiocb *req, const struct io_uring_sqe *sqe);
43int io_read(struct io_kiocb *req, unsigned int issue_flags);
44int io_write(struct io_kiocb *req, unsigned int issue_flags);
45int io_read_fixed(struct io_kiocb *req, unsigned int issue_flags);
46int io_write_fixed(struct io_kiocb *req, unsigned int issue_flags);
47void io_readv_writev_cleanup(struct io_kiocb *req);
48void io_rw_fail(struct io_kiocb *req);
49void io_req_rw_complete(struct io_tw_req tw_req, io_tw_token_t tw);
50int io_read_mshot_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
51int io_read_mshot(struct io_kiocb *req, unsigned int issue_flags);
52void io_rw_cache_free(const void *entry);