xref: /openbmc/linux/fs/ocfs2/buffer_head_io.h (revision 9ac8d3fb)
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 static inline int ocfs2_read_block(struct inode	       *inode,
35 				   u64                  off,
36 				   struct buffer_head **bh);
37 
38 int ocfs2_write_block(struct ocfs2_super          *osb,
39 		      struct buffer_head  *bh,
40 		      struct inode        *inode);
41 int ocfs2_read_blocks(struct inode	  *inode,
42 		      u64                  block,
43 		      int                  nr,
44 		      struct buffer_head  *bhs[],
45 		      int                  flags);
46 int ocfs2_read_blocks_sync(struct ocfs2_super *osb, u64 block,
47 			   unsigned int nr, struct buffer_head *bhs[]);
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 
55 static inline int ocfs2_read_block(struct inode *inode, u64 off,
56 				   struct buffer_head **bh)
57 {
58 	int status = 0;
59 
60 	if (bh == NULL) {
61 		printk("ocfs2: bh == NULL\n");
62 		status = -EINVAL;
63 		goto bail;
64 	}
65 
66 	status = ocfs2_read_blocks(inode, off, 1, bh, 0);
67 
68 bail:
69 	return status;
70 }
71 
72 #endif /* OCFS2_BUFFER_HEAD_IO_H */
73