// SPDX-License-Identifier: GPL-2.0

#include <linux/io_uring_types.h>
#include <linux/pagemap.h>

struct io_meta_state {
        u32                     seed;
        struct iov_iter_state   iter_meta;
};

struct io_async_rw {
        struct iou_vec                  vec;
        size_t                          bytes_done;

        struct_group(clear,
                struct iov_iter                 iter;
                struct iov_iter_state           iter_state;
                struct iovec                    fast_iov;
                unsigned                        buf_group;

                /*
                 * wpq is for buffered io, while meta fields are used with
                 * direct io
                 */
                union {
                        struct wait_page_queue          wpq;
                        struct {
                                struct uio_meta                 meta;
                                struct io_meta_state            meta_state;
                        };
                };
        );
};

int io_prep_read_fixed(struct io_kiocb *req, const struct io_uring_sqe *sqe);
int io_prep_write_fixed(struct io_kiocb *req, const struct io_uring_sqe *sqe);
int io_prep_readv_fixed(struct io_kiocb *req, const struct io_uring_sqe *sqe);
int io_prep_writev_fixed(struct io_kiocb *req, const struct io_uring_sqe *sqe);
int io_prep_readv(struct io_kiocb *req, const struct io_uring_sqe *sqe);
int io_prep_writev(struct io_kiocb *req, const struct io_uring_sqe *sqe);
int io_prep_read(struct io_kiocb *req, const struct io_uring_sqe *sqe);
int io_prep_write(struct io_kiocb *req, const struct io_uring_sqe *sqe);
int io_read(struct io_kiocb *req, unsigned int issue_flags);
int io_write(struct io_kiocb *req, unsigned int issue_flags);
int io_read_fixed(struct io_kiocb *req, unsigned int issue_flags);
int io_write_fixed(struct io_kiocb *req, unsigned int issue_flags);
void io_readv_writev_cleanup(struct io_kiocb *req);
void io_rw_fail(struct io_kiocb *req);
void io_req_rw_complete(struct io_tw_req tw_req, io_tw_token_t tw);
int io_read_mshot_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
int io_read_mshot(struct io_kiocb *req, unsigned int issue_flags);
void io_rw_cache_free(const void *entry);