io_uring/rw.h

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