Root/fs/ocfs2/buffer_head_io.h

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
31void ocfs2_end_buffer_io_sync(struct buffer_head *bh,
32                 int uptodate);
33
34int ocfs2_write_block(struct ocfs2_super *osb,
35              struct buffer_head *bh,
36              struct ocfs2_caching_info *ci);
37int ocfs2_read_blocks_sync(struct ocfs2_super *osb, u64 block,
38               unsigned int nr, struct buffer_head *bhs[]);
39
40/*
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 ocfs2_caching_info *ci, u64 block, int nr,
48              struct buffer_head *bhs[], int flags,
49              int (*validate)(struct super_block *sb,
50                      struct buffer_head *bh));
51
52int ocfs2_write_super_or_backup(struct ocfs2_super *osb,
53                struct buffer_head *bh);
54
55#define OCFS2_BH_IGNORE_CACHE 1
56#define OCFS2_BH_READAHEAD 8
57
58static inline int ocfs2_read_block(struct ocfs2_caching_info *ci, u64 off,
59                   struct buffer_head **bh,
60                   int (*validate)(struct super_block *sb,
61                           struct buffer_head *bh))
62{
63    int status = 0;
64
65    if (bh == NULL) {
66        printk("ocfs2: bh == NULL\n");
67        status = -EINVAL;
68        goto bail;
69    }
70
71    status = ocfs2_read_blocks(ci, off, 1, bh, 0, validate);
72
73bail:
74    return status;
75}
76
77#endif /* OCFS2_BUFFER_HEAD_IO_H */
78

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