io_uring/nop.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/kernel.h>
   3 #include <linux/errno.h>
   4 #include <linux/fs.h>
   5 #include <linux/file.h>
   6 #include <linux/io_uring.h>
   7
   8 #include <uapi/linux/io_uring.h>
   9
  10 #include "io_uring.h"
  11 #include "nop.h"
  12
  13 struct io_nop {
  14         /* NOTE: kiocb has the file as the first member, so don't do it here */
  15         struct file     *file;
  16         int             result;
  17 };
  18
  19 int io_nop_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
  20 {
  21         unsigned int flags;
  22         struct io_nop *nop = io_kiocb_to_cmd(req, struct io_nop);
  23
  24         flags = READ_ONCE(sqe->nop_flags);
  25         if (flags & ~IORING_NOP_INJECT_RESULT)
  26                 return -EINVAL;
  27
  28         if (flags & IORING_NOP_INJECT_RESULT)
  29                 nop->result = READ_ONCE(sqe->len);
  30         else
  31                 nop->result = 0;
  32         return 0;
  33 }
  34
  35 int io_nop(struct io_kiocb *req, unsigned int issue_flags)
  36 {
  37         struct io_nop *nop = io_kiocb_to_cmd(req, struct io_nop);
  38
  39         if (nop->result < 0)
  40                 req_set_fail(req);
  41         io_req_set_res(req, nop->result, 0);
  42         return IOU_OK;
  43 }