io_uring/truncate.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/mm.h>
   7 #include <linux/slab.h>
   8 #include <linux/syscalls.h>
   9 #include <linux/io_uring.h>
  10
  11 #include <uapi/linux/io_uring.h>
  12
  13 #include "../fs/internal.h"
  14
  15 #include "io_uring.h"
  16 #include "truncate.h"
  17
  18 struct io_ftrunc {
  19         struct file                     *file;
  20         loff_t                          len;
  21 };
  22
  23 int io_ftruncate_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
  24 {
  25         struct io_ftrunc *ft = io_kiocb_to_cmd(req, struct io_ftrunc);
  26
  27         if (sqe->rw_flags || sqe->addr || sqe->len || sqe->buf_index ||
  28             sqe->splice_fd_in || sqe->addr3)
  29                 return -EINVAL;
  30
  31         ft->len = READ_ONCE(sqe->off);
  32
  33         req->flags |= REQ_F_FORCE_ASYNC;
  34         return 0;
  35 }
  36
  37 int io_ftruncate(struct io_kiocb *req, unsigned int issue_flags)
  38 {
  39         struct io_ftrunc *ft = io_kiocb_to_cmd(req, struct io_ftrunc);
  40         int ret;
  41
  42         WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
  43
  44         ret = do_ftruncate(req->file, ft->len, 1);
  45
  46         io_req_set_res(req, ret, 0);
  47         return IOU_OK;
  48 }