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
15 int ocfs2_write_block(struct ocfs2_super *osb,
16 struct buffer_head *bh,
17 struct ocfs2_caching_info *ci);
18 int 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 */
28 int 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
33 int 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
ocfs2_read_block(struct ocfs2_caching_info * ci,u64 off,struct buffer_head ** bh,int (* validate)(struct super_block * sb,struct buffer_head * bh))39 static 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, off, 1, bh, 0, validate);
53
54 bail:
55 return status;
56 }
57
58 #endif /* OCFS2_BUFFER_HEAD_IO_H */
59