tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1// SPDX-License-Identifier: GPL-2.0
2#include <linux/kernel.h>
3#include <linux/errno.h>
4#include <linux/fs.h>
5#include <linux/file.h>
6#include <linux/mm.h>
7#include <linux/slab.h>
8#include <linux/namei.h>
9#include <linux/io_uring.h>
10
11#include <uapi/linux/fadvise.h>
12#include <uapi/linux/io_uring.h>
13
14#include "io_uring.h"
15#include "advise.h"
16
17struct io_fadvise {
18 struct file *file;
19 u64 offset;
20 u32 len;
21 u32 advice;
22};
23
24struct io_madvise {
25 struct file *file;
26 u64 addr;
27 u32 len;
28 u32 advice;
29};
30
31int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
32{
33#if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU)
34 struct io_madvise *ma = io_kiocb_to_cmd(req, struct io_madvise);
35
36 if (sqe->buf_index || sqe->off || sqe->splice_fd_in)
37 return -EINVAL;
38
39 ma->addr = READ_ONCE(sqe->addr);
40 ma->len = READ_ONCE(sqe->len);
41 ma->advice = READ_ONCE(sqe->fadvise_advice);
42 return 0;
43#else
44 return -EOPNOTSUPP;
45#endif
46}
47
48int io_madvise(struct io_kiocb *req, unsigned int issue_flags)
49{
50#if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU)
51 struct io_madvise *ma = io_kiocb_to_cmd(req, struct io_madvise);
52 int ret;
53
54 if (issue_flags & IO_URING_F_NONBLOCK)
55 return -EAGAIN;
56
57 ret = do_madvise(current->mm, ma->addr, ma->len, ma->advice);
58 io_req_set_res(req, ret, 0);
59 return IOU_OK;
60#else
61 return -EOPNOTSUPP;
62#endif
63}
64
65int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
66{
67 struct io_fadvise *fa = io_kiocb_to_cmd(req, struct io_fadvise);
68
69 if (sqe->buf_index || sqe->addr || sqe->splice_fd_in)
70 return -EINVAL;
71
72 fa->offset = READ_ONCE(sqe->off);
73 fa->len = READ_ONCE(sqe->len);
74 fa->advice = READ_ONCE(sqe->fadvise_advice);
75 return 0;
76}
77
78int io_fadvise(struct io_kiocb *req, unsigned int issue_flags)
79{
80 struct io_fadvise *fa = io_kiocb_to_cmd(req, struct io_fadvise);
81 int ret;
82
83 if (issue_flags & IO_URING_F_NONBLOCK) {
84 switch (fa->advice) {
85 case POSIX_FADV_NORMAL:
86 case POSIX_FADV_RANDOM:
87 case POSIX_FADV_SEQUENTIAL:
88 break;
89 default:
90 return -EAGAIN;
91 }
92 }
93
94 ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice);
95 if (ret < 0)
96 req_set_fail(req);
97 io_req_set_res(req, ret, 0);
98 return IOU_OK;
99}