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
17 struct io_fadvise {
18 struct file *file;
19 u64 offset;
20 u32 len;
21 u32 advice;
22 };
23
24 struct io_madvise {
25 struct file *file;
26 u64 addr;
27 u32 len;
28 u32 advice;
29 };
30
io_madvise_prep(struct io_kiocb * req,const struct io_uring_sqe * sqe)31 int 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
io_madvise(struct io_kiocb * req,unsigned int issue_flags)49 int 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
io_fadvise_force_async(struct io_fadvise * fa)65 static 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
io_fadvise_prep(struct io_kiocb * req,const struct io_uring_sqe * sqe)77 int 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
io_fadvise(struct io_kiocb * req,unsigned int issue_flags)92 int 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
