1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /* -*- mode: c; c-basic-offset: 8; -*-
3 * vim: noexpandtab sw=8 ts=8 sts=0:
4 *
5 * ocfs2_buffer_head.h
6 *
7 * Buffer cache handling functions defined
8 *
9 * Copyright (C) 2002, 2004 Oracle. All rights reserved.
10 */
11
12 #ifndef OCFS2_BUFFER_HEAD_IO_H
13 #define OCFS2_BUFFER_HEAD_IO_H
14
15 #include <linux/buffer_head.h>
16
17 int ocfs2_write_block(struct ocfs2_super *osb,
18 struct buffer_head *bh,
19 struct ocfs2_caching_info *ci);
20 int ocfs2_read_blocks_sync(struct ocfs2_super *osb, u64 block,
21 unsigned int nr, struct buffer_head *bhs[]);
22
23 /*
24 * If not NULL, validate() will be called on a buffer that is freshly
25 * read from disk. It will not be called if the buffer was in cache.
26 * Note that if validate() is being used for this buffer, it needs to
27 * be set even for a READAHEAD call, as it marks the buffer for later
28 * validation.
29 */
30 int ocfs2_read_blocks(struct ocfs2_caching_info *ci, u64 block, int nr,
31 struct buffer_head *bhs[], int flags,
32 int (*validate)(struct super_block *sb,
33 struct buffer_head *bh));
34
35 int ocfs2_write_super_or_backup(struct ocfs2_super *osb,
36 struct buffer_head *bh);
37
38 #define OCFS2_BH_IGNORE_CACHE 1
39 #define OCFS2_BH_READAHEAD 8
40
ocfs2_read_block(struct ocfs2_caching_info * ci,u64 off,struct buffer_head ** bh,int (* validate)(struct super_block * sb,struct buffer_head * bh))41 static inline int ocfs2_read_block(struct ocfs2_caching_info *ci, u64 off,
42 struct buffer_head **bh,
43 int (*validate)(struct super_block *sb,
44 struct buffer_head *bh))
45 {
46 int status = 0;
47
48 if (bh == NULL) {
49 printk("ocfs2: bh == NULL\n");
50 status = -EINVAL;
51 goto bail;
52 }
53
54 status = ocfs2_read_blocks(ci, off, 1, bh, 0, validate);
55
56 bail:
57 return status;
58 }
59
60 #endif /* OCFS2_BUFFER_HEAD_IO_H */
61