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, 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
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(req->file, fa->offset, fa->len, fa->advice);
100	if (ret < 0)
101		req_set_fail(req);
102	io_req_set_res(req, ret, 0);
103	return IOU_OK;
104}
105