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 req->flags |= REQ_F_FORCE_ASYNC;
43 return 0;
44#else
45 return -EOPNOTSUPP;
46#endif
47}
48
49int io_madvise(struct io_kiocb *req, unsigned int issue_flags)
50{
51#if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU)
52 struct io_madvise *ma = io_kiocb_to_cmd(req, struct io_madvise);
53 int ret;
54
55 WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
56
57 ret = do_madvise(current->mm, start: ma->addr, len_in: ma->len, behavior: ma->advice);
58 io_req_set_res(req, res: ret, cflags: 0);
59 return IOU_OK;
60#else
61 return -EOPNOTSUPP;
62#endif
63}
64
65static bool io_fadvise_force_async(struct io_fadvise *fa)
66{
67 switch (fa->advice) {
68 case POSIX_FADV_NORMAL:
69 case POSIX_FADV_RANDOM:
70 case POSIX_FADV_SEQUENTIAL:
71 return false;
72 default:
73 return true;
74 }
75}
76
77int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
78{
79 struct io_fadvise *fa = io_kiocb_to_cmd(req, struct io_fadvise);
80
81 if (sqe->buf_index || sqe->addr || sqe->splice_fd_in)
82 return -EINVAL;
83
84 fa->offset = READ_ONCE(sqe->off);
85 fa->len = READ_ONCE(sqe->len);
86 fa->advice = READ_ONCE(sqe->fadvise_advice);
87 if (io_fadvise_force_async(fa))
88 req->flags |= REQ_F_FORCE_ASYNC;
89 return 0;
90}
91
92int io_fadvise(struct io_kiocb *req, unsigned int issue_flags)
93{
94 struct io_fadvise *fa = io_kiocb_to_cmd(req, struct io_fadvise);
95 int ret;
96
97 WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK && io_fadvise_force_async(fa));
98
99 ret = vfs_fadvise(file: req->file, offset: fa->offset, len: fa->len, advice: fa->advice);
100 if (ret < 0)
101 req_set_fail(req);
102 io_req_set_res(req, res: ret, cflags: 0);
103 return IOU_OK;
104}
105

source code of linux/io_uring/advise.c