1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * ocfs2_buffer_head.h
4 *
5 * Buffer cache handling functions defined
6 *
7 * Copyright (C) 2002, 2004 Oracle. All rights reserved.
8 */
9
10#ifndef OCFS2_BUFFER_HEAD_IO_H
11#define OCFS2_BUFFER_HEAD_IO_H
12
13#include <linux/buffer_head.h>
14
15int ocfs2_write_block(struct ocfs2_super *osb,
16 struct buffer_head *bh,
17 struct ocfs2_caching_info *ci);
18int ocfs2_read_blocks_sync(struct ocfs2_super *osb, u64 block,
19 unsigned int nr, struct buffer_head *bhs[]);
20
21/*
22 * If not NULL, validate() will be called on a buffer that is freshly
23 * read from disk. It will not be called if the buffer was in cache.
24 * Note that if validate() is being used for this buffer, it needs to
25 * be set even for a READAHEAD call, as it marks the buffer for later
26 * validation.
27 */
28int ocfs2_read_blocks(struct ocfs2_caching_info *ci, u64 block, int nr,
29 struct buffer_head *bhs[], int flags,
30 int (*validate)(struct super_block *sb,
31 struct buffer_head *bh));
32
33int ocfs2_write_super_or_backup(struct ocfs2_super *osb,
34 struct buffer_head *bh);
35
36#define OCFS2_BH_IGNORE_CACHE 1
37#define OCFS2_BH_READAHEAD 8
38
39static inline int ocfs2_read_block(struct ocfs2_caching_info *ci, u64 off,
40 struct buffer_head **bh,
41 int (*validate)(struct super_block *sb,
42 struct buffer_head *bh))
43{
44 int status = 0;
45
46 if (bh == NULL) {
47 printk("ocfs2: bh == NULL\n");
48 status = -EINVAL;
49 goto bail;
50 }
51
52 status = ocfs2_read_blocks(ci, block: off, nr: 1, bhs: bh, flags: 0, validate);
53
54bail:
55 return status;
56}
57
58#endif /* OCFS2_BUFFER_HEAD_IO_H */
59

source code of linux/fs/ocfs2/buffer_head_io.h