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e0da14de JA |
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_types.h" | |
12 | #include "io_uring.h" | |
13 | #include "statx.h" | |
14 | ||
15 | struct io_statx { | |
16 | struct file *file; | |
17 | int dfd; | |
18 | unsigned int mask; | |
19 | unsigned int flags; | |
20 | struct filename *filename; | |
21 | struct statx __user *buffer; | |
22 | }; | |
23 | ||
24 | int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
25 | { | |
26 | struct io_statx *sx = io_kiocb_to_cmd(req); | |
27 | const char __user *path; | |
28 | ||
29 | if (sqe->buf_index || sqe->splice_fd_in) | |
30 | return -EINVAL; | |
31 | if (req->flags & REQ_F_FIXED_FILE) | |
32 | return -EBADF; | |
33 | ||
34 | sx->dfd = READ_ONCE(sqe->fd); | |
35 | sx->mask = READ_ONCE(sqe->len); | |
36 | path = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
37 | sx->buffer = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
38 | sx->flags = READ_ONCE(sqe->statx_flags); | |
39 | ||
40 | sx->filename = getname_flags(path, | |
41 | getname_statx_lookup_flags(sx->flags), | |
42 | NULL); | |
43 | ||
44 | if (IS_ERR(sx->filename)) { | |
45 | int ret = PTR_ERR(sx->filename); | |
46 | ||
47 | sx->filename = NULL; | |
48 | return ret; | |
49 | } | |
50 | ||
51 | req->flags |= REQ_F_NEED_CLEANUP; | |
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); | |
58 | int ret; | |
59 | ||
60 | if (issue_flags & IO_URING_F_NONBLOCK) | |
61 | return -EAGAIN; | |
62 | ||
63 | ret = do_statx(sx->dfd, sx->filename, sx->flags, sx->mask, sx->buffer); | |
64 | io_req_set_res(req, ret, 0); | |
65 | return IOU_OK; | |
66 | } | |
67 | ||
68 | void io_statx_cleanup(struct io_kiocb *req) | |
69 | { | |
70 | struct io_statx *sx = io_kiocb_to_cmd(req); | |
71 | ||
72 | if (sx->filename) | |
73 | putname(sx->filename); | |
74 | } |