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
18struct io_ftrunc {
19 struct file *file;
20 loff_t len;
21};
22
23int 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
37int 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(file: req->file, length: ft->len, small: 1);
45
46 io_req_set_res(req, res: ret, cflags: 0);
47 return IOU_OK;
48}
49

source code of linux/io_uring/truncate.c