1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3  * ocfs2_buffer_head.h
4  *
5  * Buffer cache handling functions defined
6  *
7  * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
8  */
9 
10 #ifndef OCFS2_BUFFER_HEAD_IO_H
11 #define OCFS2_BUFFER_HEAD_IO_H
12 
13 #include <linux/buffer_head.h>
14 
15 int ocfs2_write_block(struct ocfs2_super          *osb,
16 		      struct buffer_head  *bh,
17 		      struct ocfs2_caching_info   *ci);
18 int ocfs2_read_blocks_sync(struct ocfs2_super *osb, u64 block,
19 			   unsigned int nr, struct buffer_head *bhs[]);
20 
21 /*
22  * If not NULL, validate() will be called on a buffer that is freshly
23  * read from disk.  It will not be called if the buffer was in cache.
24  * Note that if validate() is being used for this buffer, it needs to
25  * be set even for a READAHEAD call, as it marks the buffer for later
26  * validation.
27  */
28 int ocfs2_read_blocks(struct ocfs2_caching_info *ci, u64 block, int nr,
29 		      struct buffer_head *bhs[], int flags,
30 		      int (*validate)(struct super_block *sb,
31 				      struct buffer_head *bh));
32 
33 int ocfs2_write_super_or_backup(struct ocfs2_super *osb,
34 				struct buffer_head *bh);
35 
36 #define OCFS2_BH_IGNORE_CACHE      1
37 #define OCFS2_BH_READAHEAD         8
38 
ocfs2_read_block(struct ocfs2_caching_info * ci,u64 off,struct buffer_head ** bh,int (* validate)(struct super_block * sb,struct buffer_head * bh))39 static inline int ocfs2_read_block(struct ocfs2_caching_info *ci, u64 off,
40 				   struct buffer_head **bh,
41 				   int (*validate)(struct super_block *sb,
42 						   struct buffer_head *bh))
43 {
44 	int status = 0;
45 
46 	if (bh == NULL) {
47 		printk("ocfs2: bh == NULL\n");
48 		status = -EINVAL;
49 		goto bail;
50 	}
51 
52 	status = ocfs2_read_blocks(ci, off, 1, bh, 0, validate);
53 
54 bail:
55 	return status;
56 }
57 
58 #endif /* OCFS2_BUFFER_HEAD_IO_H */
59