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Mark Fashehccd979b2005-12-15 14:31:24 -08001/* -*- 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
31void ocfs2_end_buffer_io_sync(struct buffer_head *bh,
32 int uptodate);
33
Mark Fashehccd979b2005-12-15 14:31:24 -080034int ocfs2_write_block(struct ocfs2_super *osb,
35 struct buffer_head *bh,
36 struct inode *inode);
Joel Beckerda1e9092008-10-09 17:20:29 -070037int ocfs2_read_blocks_sync(struct ocfs2_super *osb, u64 block,
38 unsigned int nr, struct buffer_head *bhs[]);
Mark Fashehccd979b2005-12-15 14:31:24 -080039
Joel Becker970e4932008-11-13 14:49:19 -080040/*
41 * If not NULL, validate() will be called on a buffer that is freshly
42 * read from disk. It will not be called if the buffer was in cache.
43 * Note that if validate() is being used for this buffer, it needs to
44 * be set even for a READAHEAD call, as it marks the buffer for later
45 * validation.
46 */
47int ocfs2_read_blocks(struct inode *inode, u64 block, int nr,
48 struct buffer_head *bhs[], int flags,
49 int (*validate)(struct super_block *sb,
50 struct buffer_head *bh));
51
Tao Mad6590722007-12-18 15:47:03 +080052int ocfs2_write_super_or_backup(struct ocfs2_super *osb,
53 struct buffer_head *bh);
Mark Fashehccd979b2005-12-15 14:31:24 -080054
Joel Beckerd4a8c932008-10-09 17:20:34 -070055#define OCFS2_BH_IGNORE_CACHE 1
Mark Fashehaa958872006-04-21 13:49:02 -070056#define OCFS2_BH_READAHEAD 8
Mark Fashehccd979b2005-12-15 14:31:24 -080057
Joel Becker31d33072008-10-09 17:20:30 -070058static inline int ocfs2_read_block(struct inode *inode, u64 off,
Joel Becker970e4932008-11-13 14:49:19 -080059 struct buffer_head **bh,
60 int (*validate)(struct super_block *sb,
61 struct buffer_head *bh))
Mark Fashehccd979b2005-12-15 14:31:24 -080062{
63 int status = 0;
64
65 if (bh == NULL) {
66 printk("ocfs2: bh == NULL\n");
67 status = -EINVAL;
68 goto bail;
69 }
70
Joel Becker970e4932008-11-13 14:49:19 -080071 status = ocfs2_read_blocks(inode, off, 1, bh, 0, validate);
Mark Fashehccd979b2005-12-15 14:31:24 -080072
73bail:
74 return status;
75}
76
77#endif /* OCFS2_BUFFER_HEAD_IO_H */