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
14struct 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
23int 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(sx->flags),
41				     NULL);
42
43	if (IS_ERR(sx->filename)) {
44		int ret = PTR_ERR(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
55int 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(sx->dfd, sx->filename, sx->flags, sx->mask, sx->buffer);
63	io_req_set_res(req, ret, 0);
64	return IOU_OK;
65}
66
67void 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(sx->filename);
73}
74