aboutsummaryrefslogtreecommitdiff
path: root/io_uring/advise.c
blob: 581956934c0bf0c96f83c9fa6df2c76c2916883f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
// SPDX-License-Identifier: GPL-2.0
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/namei.h>
#include <linux/io_uring.h>

#include <uapi/linux/fadvise.h>
#include <uapi/linux/io_uring.h>

#include "io_uring.h"
#include "advise.h"

struct io_fadvise {
	struct file			*file;
	u64				offset;
	u32				len;
	u32				advice;
};

struct io_madvise {
	struct file			*file;
	u64				addr;
	u32				len;
	u32				advice;
};

int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
#if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU)
	struct io_madvise *ma = io_kiocb_to_cmd(req);

	if (sqe->buf_index || sqe->off || sqe->splice_fd_in)
		return -EINVAL;

	ma->addr = READ_ONCE(sqe->addr);
	ma->len = READ_ONCE(sqe->len);
	ma->advice = READ_ONCE(sqe->fadvise_advice);
	return 0;
#else
	return -EOPNOTSUPP;
#endif
}

int io_madvise(struct io_kiocb *req, unsigned int issue_flags)
{
#if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU)
	struct io_madvise *ma = io_kiocb_to_cmd(req);
	int ret;

	if (issue_flags & IO_URING_F_NONBLOCK)
		return -EAGAIN;

	ret = do_madvise(current->mm, ma->addr, ma->len, ma->advice);
	io_req_set_res(req, ret, 0);
	return IOU_OK;
#else
	return -EOPNOTSUPP;
#endif
}

int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
	struct io_fadvise *fa = io_kiocb_to_cmd(req);

	if (sqe->buf_index || sqe->addr || sqe->splice_fd_in)
		return -EINVAL;

	fa->offset = READ_ONCE(sqe->off);
	fa->len = READ_ONCE(sqe->len);
	fa->advice = READ_ONCE(sqe->fadvise_advice);
	return 0;
}

int io_fadvise(struct io_kiocb *req, unsigned int issue_flags)
{
	struct io_fadvise *fa = io_kiocb_to_cmd(req);
	int ret;

	if (issue_flags & IO_URING_F_NONBLOCK) {
		switch (fa->advice) {
		case POSIX_FADV_NORMAL:
		case POSIX_FADV_RANDOM:
		case POSIX_FADV_SEQUENTIAL:
			break;
		default:
			return -EAGAIN;
		}
	}

	ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice);
	if (ret < 0)
		req_set_fail(req);
	io_req_set_res(req, ret, 0);
	return IOU_OK;
}