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
31 int ocfs2_write_block(struct ocfs2_super *osb,
32 struct buffer_head *bh,
33 struct ocfs2_caching_info *ci);
34 int ocfs2_read_blocks_sync(struct ocfs2_super *osb, u64 block,
35 unsigned int nr, struct buffer_head *bhs[]);
36
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 */
44 int ocfs2_read_blocks(struct ocfs2_caching_info *ci, u64 block, int nr,
45 struct buffer_head *bhs[], int flags,
46 int (*validate)(struct super_block *sb,
47 struct buffer_head *bh));
48
49 int ocfs2_write_super_or_backup(struct ocfs2_super *osb,
50 struct buffer_head *bh);
51
52 #define OCFS2_BH_IGNORE_CACHE 1
53 #define OCFS2_BH_READAHEAD 8
54
ocfs2_read_block(struct ocfs2_caching_info * ci,u64 off,struct buffer_head ** bh,int (* validate)(struct super_block * sb,struct buffer_head * bh))55 static inline int ocfs2_read_block(struct ocfs2_caching_info *ci, u64 off,
56 struct buffer_head **bh,
57 int (*validate)(struct super_block *sb,
58 struct buffer_head *bh))
59 {
60 int status = 0;
61
62 if (bh == NULL) {
63 printk("ocfs2: bh == NULL\n");
64 status = -EINVAL;
65 goto bail;
66 }
67
68 status = ocfs2_read_blocks(ci, off, 1, bh, 0, validate);
69
70 bail:
71 return status;
72 }
73
74 #endif /* OCFS2_BUFFER_HEAD_IO_H */
75