1 | // SPDX-License-Identifier: GPL-2.0 |
2 | #include <linux/kernel.h> |
3 | #include <linux/errno.h> |
4 | #include <linux/file.h> |
5 | #include <linux/io_uring.h> |
6 | |
7 | #include <uapi/linux/io_uring.h> |
8 | |
9 | #include "../fs/internal.h" |
10 | |
11 | #include "io_uring.h" |
12 | #include "statx.h" |
13 | |
14 | struct io_statx { |
15 | struct file *file; |
16 | int dfd; |
17 | unsigned int mask; |
18 | unsigned int flags; |
19 | struct filename *filename; |
20 | struct statx __user *buffer; |
21 | }; |
22 | |
23 | int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
24 | { |
25 | struct io_statx *sx = io_kiocb_to_cmd(req, struct io_statx); |
26 | const char __user *path; |
27 | |
28 | if (sqe->buf_index || sqe->splice_fd_in) |
29 | return -EINVAL; |
30 | if (req->flags & REQ_F_FIXED_FILE) |
31 | return -EBADF; |
32 | |
33 | sx->dfd = READ_ONCE(sqe->fd); |
34 | sx->mask = READ_ONCE(sqe->len); |
35 | path = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
36 | sx->buffer = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
37 | sx->flags = READ_ONCE(sqe->statx_flags); |
38 | |
39 | sx->filename = getname_flags(path, |
40 | getname_statx_lookup_flags(flags: sx->flags), |
41 | NULL); |
42 | |
43 | if (IS_ERR(ptr: sx->filename)) { |
44 | int ret = PTR_ERR(ptr: sx->filename); |
45 | |
46 | sx->filename = NULL; |
47 | return ret; |
48 | } |
49 | |
50 | req->flags |= REQ_F_NEED_CLEANUP; |
51 | req->flags |= REQ_F_FORCE_ASYNC; |
52 | return 0; |
53 | } |
54 | |
55 | int io_statx(struct io_kiocb *req, unsigned int issue_flags) |
56 | { |
57 | struct io_statx *sx = io_kiocb_to_cmd(req, struct io_statx); |
58 | int ret; |
59 | |
60 | WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK); |
61 | |
62 | ret = do_statx(dfd: sx->dfd, filename: sx->filename, flags: sx->flags, mask: sx->mask, buffer: sx->buffer); |
63 | io_req_set_res(req, res: ret, cflags: 0); |
64 | return IOU_OK; |
65 | } |
66 | |
67 | void io_statx_cleanup(struct io_kiocb *req) |
68 | { |
69 | struct io_statx *sx = io_kiocb_to_cmd(req, struct io_statx); |
70 | |
71 | if (sx->filename) |
72 | putname(name: sx->filename); |
73 | } |
74 | |