io_uring: add sync cancelation API through io_uring_register()
[linux-2.6-microblaze.git] / io_uring / statx.c
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
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);
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
54 int io_statx(struct io_kiocb *req, unsigned int issue_flags)
55 {
56         struct io_statx *sx = io_kiocb_to_cmd(req);
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
67 void io_statx_cleanup(struct io_kiocb *req)
68 {
69         struct io_statx *sx = io_kiocb_to_cmd(req);
70
71         if (sx->filename)
72                 putname(sx->filename);
73 }