1 // SPDX-License-Identifier: GPL-2.0
2 
3 #include <linux/io_uring_types.h>
4 #include <linux/pagemap.h>
5 
6 struct io_meta_state {
7 	u32			seed;
8 	struct iov_iter_state	iter_meta;
9 };
10 
11 struct 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 
35 int io_prep_read_fixed(struct io_kiocb *req, const struct io_uring_sqe *sqe);
36 int io_prep_write_fixed(struct io_kiocb *req, const struct io_uring_sqe *sqe);
37 int io_prep_readv_fixed(struct io_kiocb *req, const struct io_uring_sqe *sqe);
38 int io_prep_writev_fixed(struct io_kiocb *req, const struct io_uring_sqe *sqe);
39 int io_prep_readv(struct io_kiocb *req, const struct io_uring_sqe *sqe);
40 int io_prep_writev(struct io_kiocb *req, const struct io_uring_sqe *sqe);
41 int io_prep_read(struct io_kiocb *req, const struct io_uring_sqe *sqe);
42 int io_prep_write(struct io_kiocb *req, const struct io_uring_sqe *sqe);
43 int io_read(struct io_kiocb *req, unsigned int issue_flags);
44 int io_write(struct io_kiocb *req, unsigned int issue_flags);
45 int io_read_fixed(struct io_kiocb *req, unsigned int issue_flags);
46 int io_write_fixed(struct io_kiocb *req, unsigned int issue_flags);
47 void io_readv_writev_cleanup(struct io_kiocb *req);
48 void io_rw_fail(struct io_kiocb *req);
49 void io_req_rw_complete(struct io_kiocb *req, io_tw_token_t tw);
50 int io_read_mshot_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
51 int io_read_mshot(struct io_kiocb *req, unsigned int issue_flags);
52 void io_rw_cache_free(const void *entry);
53