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 | |
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, block: off, nr: 1, bhs: bh, flags: 0, validate); |
53 | |
54 | bail: |
55 | return status; |
56 | } |
57 | |
58 | #endif /* OCFS2_BUFFER_HEAD_IO_H */ |
59 | |