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_uflags(path, sx->flags);
40
41	if (IS_ERR(sx->filename)) {
42		int ret = PTR_ERR(sx->filename);
43
44		sx->filename = NULL;
45		return ret;
46	}
47
48	req->flags |= REQ_F_NEED_CLEANUP;
49	req->flags |= REQ_F_FORCE_ASYNC;
50	return 0;
51}
52
53int io_statx(struct io_kiocb *req, unsigned int issue_flags)
54{
55	struct io_statx *sx = io_kiocb_to_cmd(req, struct io_statx);
56	int ret;
57
58	WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
59
60	ret = do_statx(sx->dfd, sx->filename, sx->flags, sx->mask, sx->buffer);
61	io_req_set_res(req, ret, 0);
62	return IOU_OK;
63}
64
65void io_statx_cleanup(struct io_kiocb *req)
66{
67	struct io_statx *sx = io_kiocb_to_cmd(req, struct io_statx);
68
69	if (sx->filename)
70		putname(sx->filename);
71}