1 | // SPDX-License-Identifier: GPL-2.0 |
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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(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 |