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 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 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 if (issue_flags & IO_URING_F_NONBLOCK)
60 return -EAGAIN;
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
io_statx_cleanup(struct io_kiocb * req)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(sx->filename);
73 }
74
