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 
io_statx_prep(struct io_kiocb * req,const struct io_uring_sqe * sqe)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(sx->flags));
41 
42 	if (IS_ERR(sx->filename)) {
43 		int ret = PTR_ERR(sx->filename);
44 
45 		sx->filename = NULL;
46 		return ret;
47 	}
48 
49 	req->flags |= REQ_F_NEED_CLEANUP;
50 	req->flags |= REQ_F_FORCE_ASYNC;
51 	return 0;
52 }
53 
io_statx(struct io_kiocb * req,unsigned int issue_flags)54 int io_statx(struct io_kiocb *req, unsigned int issue_flags)
55 {
56 	struct io_statx *sx = io_kiocb_to_cmd(req, struct io_statx);
57 	int ret;
58 
59 	WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
60 
61 	ret = do_statx(sx->dfd, sx->filename, sx->flags, sx->mask, sx->buffer);
62 	io_req_set_res(req, ret, 0);
63 	return IOU_OK;
64 }
65 
io_statx_cleanup(struct io_kiocb * req)66 void io_statx_cleanup(struct io_kiocb *req)
67 {
68 	struct io_statx *sx = io_kiocb_to_cmd(req, struct io_statx);
69 
70 	if (sx->filename)
71 		putname(sx->filename);
72 }
73