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ccd979bd MF |
1 | /* -*- mode: c; c-basic-offset: 8; -*- |
2 | * vim: noexpandtab sw=8 ts=8 sts=0: | |
3 | * | |
4 | * ocfs2_buffer_head.h | |
5 | * | |
6 | * Buffer cache handling functions defined | |
7 | * | |
8 | * Copyright (C) 2002, 2004 Oracle. All rights reserved. | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public | |
12 | * License as published by the Free Software Foundation; either | |
13 | * version 2 of the License, or (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
18 | * General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public | |
21 | * License along with this program; if not, write to the | |
22 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
23 | * Boston, MA 021110-1307, USA. | |
24 | */ | |
25 | ||
26 | #ifndef OCFS2_BUFFER_HEAD_IO_H | |
27 | #define OCFS2_BUFFER_HEAD_IO_H | |
28 | ||
29 | #include <linux/buffer_head.h> | |
30 | ||
ccd979bd MF |
31 | int ocfs2_write_block(struct ocfs2_super *osb, |
32 | struct buffer_head *bh, | |
8cb471e8 | 33 | struct ocfs2_caching_info *ci); |
da1e9098 JB |
34 | int ocfs2_read_blocks_sync(struct ocfs2_super *osb, u64 block, |
35 | unsigned int nr, struct buffer_head *bhs[]); | |
ccd979bd | 36 | |
970e4936 JB |
37 | /* |
38 | * If not NULL, validate() will be called on a buffer that is freshly | |
39 | * read from disk. It will not be called if the buffer was in cache. | |
40 | * Note that if validate() is being used for this buffer, it needs to | |
41 | * be set even for a READAHEAD call, as it marks the buffer for later | |
42 | * validation. | |
43 | */ | |
8cb471e8 | 44 | int ocfs2_read_blocks(struct ocfs2_caching_info *ci, u64 block, int nr, |
970e4936 JB |
45 | struct buffer_head *bhs[], int flags, |
46 | int (*validate)(struct super_block *sb, | |
47 | struct buffer_head *bh)); | |
48 | ||
d659072f TM |
49 | int ocfs2_write_super_or_backup(struct ocfs2_super *osb, |
50 | struct buffer_head *bh); | |
ccd979bd | 51 | |
d4a8c93c | 52 | #define OCFS2_BH_IGNORE_CACHE 1 |
aa958874 | 53 | #define OCFS2_BH_READAHEAD 8 |
ccd979bd | 54 | |
8cb471e8 | 55 | static inline int ocfs2_read_block(struct ocfs2_caching_info *ci, u64 off, |
970e4936 JB |
56 | struct buffer_head **bh, |
57 | int (*validate)(struct super_block *sb, | |
58 | struct buffer_head *bh)) | |
ccd979bd MF |
59 | { |
60 | int status = 0; | |
61 | ||
62 | if (bh == NULL) { | |
63 | printk("ocfs2: bh == NULL\n"); | |
64 | status = -EINVAL; | |
65 | goto bail; | |
66 | } | |
67 | ||
8cb471e8 | 68 | status = ocfs2_read_blocks(ci, off, 1, bh, 0, validate); |
ccd979bd MF |
69 | |
70 | bail: | |
71 | return status; | |
72 | } | |
73 | ||
74 | #endif /* OCFS2_BUFFER_HEAD_IO_H */ |