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buffer_head_io.h
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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 void ocfs2_end_buffer_io_sync(struct buffer_head *bh,
32  int uptodate);
33 
34 int ocfs2_write_block(struct ocfs2_super *osb,
35  struct buffer_head *bh,
36  struct ocfs2_caching_info *ci);
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  */
47 int 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 
53  struct buffer_head *bh);
54 
55 #define OCFS2_BH_IGNORE_CACHE 1
56 #define OCFS2_BH_READAHEAD 8
57 
58 static 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 
73 bail:
74  return status;
75 }
76 
77 #endif /* OCFS2_BUFFER_HEAD_IO_H */