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#include <linux/fsnotify.h>
11
12#include <uapi/linux/io_uring.h>
13
14#include "io_uring.h"
15#include "sync.h"
16
17struct io_sync {
18	struct file			*file;
19	loff_t				len;
20	loff_t				off;
21	int				flags;
22	int				mode;
23};
24
25int io_sfr_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
26{
27	struct io_sync *sync = io_kiocb_to_cmd(req, struct io_sync);
28
29	if (unlikely(sqe->addr || sqe->buf_index || sqe->splice_fd_in))
30		return -EINVAL;
31
32	sync->off = READ_ONCE(sqe->off);
33	sync->len = READ_ONCE(sqe->len);
34	sync->flags = READ_ONCE(sqe->sync_range_flags);
35	req->flags |= REQ_F_FORCE_ASYNC;
36
37	return 0;
38}
39
40int io_sync_file_range(struct io_kiocb *req, unsigned int issue_flags)
41{
42	struct io_sync *sync = io_kiocb_to_cmd(req, struct io_sync);
43	int ret;
44
45	/* sync_file_range always requires a blocking context */
46	WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
47
48	ret = sync_file_range(req->file, sync->off, sync->len, sync->flags);
49	io_req_set_res(req, ret, 0);
50	return IOU_OK;
51}
52
53int io_fsync_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
54{
55	struct io_sync *sync = io_kiocb_to_cmd(req, struct io_sync);
56
57	if (unlikely(sqe->addr || sqe->buf_index || sqe->splice_fd_in))
58		return -EINVAL;
59
60	sync->flags = READ_ONCE(sqe->fsync_flags);
61	if (unlikely(sync->flags & ~IORING_FSYNC_DATASYNC))
62		return -EINVAL;
63
64	sync->off = READ_ONCE(sqe->off);
65	sync->len = READ_ONCE(sqe->len);
66	req->flags |= REQ_F_FORCE_ASYNC;
67	return 0;
68}
69
70int io_fsync(struct io_kiocb *req, unsigned int issue_flags)
71{
72	struct io_sync *sync = io_kiocb_to_cmd(req, struct io_sync);
73	loff_t end = sync->off + sync->len;
74	int ret;
75
76	/* fsync always requires a blocking context */
77	WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
78
79	ret = vfs_fsync_range(req->file, sync->off, end > 0 ? end : LLONG_MAX,
80				sync->flags & IORING_FSYNC_DATASYNC);
81	io_req_set_res(req, ret, 0);
82	return IOU_OK;
83}
84
85int io_fallocate_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
86{
87	struct io_sync *sync = io_kiocb_to_cmd(req, struct io_sync);
88
89	if (sqe->buf_index || sqe->rw_flags || sqe->splice_fd_in)
90		return -EINVAL;
91
92	sync->off = READ_ONCE(sqe->off);
93	sync->len = READ_ONCE(sqe->addr);
94	sync->mode = READ_ONCE(sqe->len);
95	req->flags |= REQ_F_FORCE_ASYNC;
96	return 0;
97}
98
99int io_fallocate(struct io_kiocb *req, unsigned int issue_flags)
100{
101	struct io_sync *sync = io_kiocb_to_cmd(req, struct io_sync);
102	int ret;
103
104	/* fallocate always requiring blocking context */
105	WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
106
107	ret = vfs_fallocate(req->file, sync->mode, sync->off, sync->len);
108	if (ret >= 0)
109		fsnotify_modify(req->file);
110	io_req_set_res(req, ret, 0);
111	return IOU_OK;
112}
113