1f4c163ddSJens Axboe // SPDX-License-Identifier: GPL-2.0
2f4c163ddSJens Axboe #include <linux/kernel.h>
3f4c163ddSJens Axboe #include <linux/errno.h>
4f4c163ddSJens Axboe #include <linux/fs.h>
5f4c163ddSJens Axboe #include <linux/file.h>
6f4c163ddSJens Axboe #include <linux/mm.h>
7f4c163ddSJens Axboe #include <linux/slab.h>
8f4c163ddSJens Axboe #include <linux/namei.h>
9f4c163ddSJens Axboe #include <linux/io_uring.h>
10f4c163ddSJens Axboe
11f4c163ddSJens Axboe #include <uapi/linux/fadvise.h>
12f4c163ddSJens Axboe #include <uapi/linux/io_uring.h>
13f4c163ddSJens Axboe
14f4c163ddSJens Axboe #include "io_uring.h"
15f4c163ddSJens Axboe #include "advise.h"
16f4c163ddSJens Axboe
17f4c163ddSJens Axboe struct io_fadvise {
18f4c163ddSJens Axboe struct file *file;
19f4c163ddSJens Axboe u64 offset;
20f4c163ddSJens Axboe u32 len;
21f4c163ddSJens Axboe u32 advice;
22f4c163ddSJens Axboe };
23f4c163ddSJens Axboe
24f4c163ddSJens Axboe struct io_madvise {
25f4c163ddSJens Axboe struct file *file;
26f4c163ddSJens Axboe u64 addr;
27f4c163ddSJens Axboe u32 len;
28f4c163ddSJens Axboe u32 advice;
29f4c163ddSJens Axboe };
30f4c163ddSJens Axboe
io_madvise_prep(struct io_kiocb * req,const struct io_uring_sqe * sqe)31f4c163ddSJens Axboe int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
32f4c163ddSJens Axboe {
33f4c163ddSJens Axboe #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU)
34f2ccb5aeSStefan Metzmacher struct io_madvise *ma = io_kiocb_to_cmd(req, struct io_madvise);
35f4c163ddSJens Axboe
36f4c163ddSJens Axboe if (sqe->buf_index || sqe->off || sqe->splice_fd_in)
37f4c163ddSJens Axboe return -EINVAL;
38f4c163ddSJens Axboe
39f4c163ddSJens Axboe ma->addr = READ_ONCE(sqe->addr);
40f4c163ddSJens Axboe ma->len = READ_ONCE(sqe->len);
41f4c163ddSJens Axboe ma->advice = READ_ONCE(sqe->fadvise_advice);
42aebb224fSDylan Yudaken req->flags |= REQ_F_FORCE_ASYNC;
43f4c163ddSJens Axboe return 0;
44f4c163ddSJens Axboe #else
45f4c163ddSJens Axboe return -EOPNOTSUPP;
46f4c163ddSJens Axboe #endif
47f4c163ddSJens Axboe }
48f4c163ddSJens Axboe
io_madvise(struct io_kiocb * req,unsigned int issue_flags)49f4c163ddSJens Axboe int io_madvise(struct io_kiocb *req, unsigned int issue_flags)
50f4c163ddSJens Axboe {
51f4c163ddSJens Axboe #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU)
52f2ccb5aeSStefan Metzmacher struct io_madvise *ma = io_kiocb_to_cmd(req, struct io_madvise);
53f4c163ddSJens Axboe int ret;
54f4c163ddSJens Axboe
55aebb224fSDylan Yudaken WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
56f4c163ddSJens Axboe
57f4c163ddSJens Axboe ret = do_madvise(current->mm, ma->addr, ma->len, ma->advice);
58f4c163ddSJens Axboe io_req_set_res(req, ret, 0);
59f4c163ddSJens Axboe return IOU_OK;
60f4c163ddSJens Axboe #else
61f4c163ddSJens Axboe return -EOPNOTSUPP;
62f4c163ddSJens Axboe #endif
63f4c163ddSJens Axboe }
64f4c163ddSJens Axboe
io_fadvise_force_async(struct io_fadvise * fa)65*c31cc60fSDylan Yudaken static bool io_fadvise_force_async(struct io_fadvise *fa)
66*c31cc60fSDylan Yudaken {
67*c31cc60fSDylan Yudaken switch (fa->advice) {
68*c31cc60fSDylan Yudaken case POSIX_FADV_NORMAL:
69*c31cc60fSDylan Yudaken case POSIX_FADV_RANDOM:
70*c31cc60fSDylan Yudaken case POSIX_FADV_SEQUENTIAL:
71*c31cc60fSDylan Yudaken return false;
72*c31cc60fSDylan Yudaken default:
73*c31cc60fSDylan Yudaken return true;
74*c31cc60fSDylan Yudaken }
75*c31cc60fSDylan Yudaken }
76*c31cc60fSDylan Yudaken
io_fadvise_prep(struct io_kiocb * req,const struct io_uring_sqe * sqe)77f4c163ddSJens Axboe int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
78f4c163ddSJens Axboe {
79f2ccb5aeSStefan Metzmacher struct io_fadvise *fa = io_kiocb_to_cmd(req, struct io_fadvise);
80f4c163ddSJens Axboe
81f4c163ddSJens Axboe if (sqe->buf_index || sqe->addr || sqe->splice_fd_in)
82f4c163ddSJens Axboe return -EINVAL;
83f4c163ddSJens Axboe
84f4c163ddSJens Axboe fa->offset = READ_ONCE(sqe->off);
85f4c163ddSJens Axboe fa->len = READ_ONCE(sqe->len);
86f4c163ddSJens Axboe fa->advice = READ_ONCE(sqe->fadvise_advice);
87*c31cc60fSDylan Yudaken if (io_fadvise_force_async(fa))
88*c31cc60fSDylan Yudaken req->flags |= REQ_F_FORCE_ASYNC;
89f4c163ddSJens Axboe return 0;
90f4c163ddSJens Axboe }
91f4c163ddSJens Axboe
io_fadvise(struct io_kiocb * req,unsigned int issue_flags)92f4c163ddSJens Axboe int io_fadvise(struct io_kiocb *req, unsigned int issue_flags)
93f4c163ddSJens Axboe {
94f2ccb5aeSStefan Metzmacher struct io_fadvise *fa = io_kiocb_to_cmd(req, struct io_fadvise);
95f4c163ddSJens Axboe int ret;
96f4c163ddSJens Axboe
97*c31cc60fSDylan Yudaken WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK && io_fadvise_force_async(fa));
98f4c163ddSJens Axboe
99f4c163ddSJens Axboe ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice);
100f4c163ddSJens Axboe if (ret < 0)
101f4c163ddSJens Axboe req_set_fail(req);
102f4c163ddSJens Axboe io_req_set_res(req, ret, 0);
103f4c163ddSJens Axboe return IOU_OK;
104f4c163ddSJens Axboe }
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