1/* SPDX-License-Identifier: GPL-2.0-or-later */
 2/* -*- mode: c; c-basic-offset: 8; -*-
 3 * vim: noexpandtab sw=8 ts=8 sts=0:
 4 *
 5 * ocfs2_buffer_head.h
 6 *
 7 * Buffer cache handling functions defined
 8 *
 9 * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
10 */
11
12#ifndef OCFS2_BUFFER_HEAD_IO_H
13#define OCFS2_BUFFER_HEAD_IO_H
14
15#include <linux/buffer_head.h>
16
17int ocfs2_write_block(struct ocfs2_super          *osb,
18		      struct buffer_head  *bh,
19		      struct ocfs2_caching_info   *ci);
20int ocfs2_read_blocks_sync(struct ocfs2_super *osb, u64 block,
21			   unsigned int nr, struct buffer_head *bhs[]);
22
23/*
24 * If not NULL, validate() will be called on a buffer that is freshly
25 * read from disk.  It will not be called if the buffer was in cache.
26 * Note that if validate() is being used for this buffer, it needs to
27 * be set even for a READAHEAD call, as it marks the buffer for later
28 * validation.
29 */
30int ocfs2_read_blocks(struct ocfs2_caching_info *ci, u64 block, int nr,
31		      struct buffer_head *bhs[], int flags,
32		      int (*validate)(struct super_block *sb,
33				      struct buffer_head *bh));
34
35int ocfs2_write_super_or_backup(struct ocfs2_super *osb,
36				struct buffer_head *bh);
37
38#define OCFS2_BH_IGNORE_CACHE      1
39#define OCFS2_BH_READAHEAD         8
40
41static inline int ocfs2_read_block(struct ocfs2_caching_info *ci, u64 off,
42				   struct buffer_head **bh,
43				   int (*validate)(struct super_block *sb,
44						   struct buffer_head *bh))
45{
46	int status = 0;
47
48	if (bh == NULL) {
49		printk("ocfs2: bh == NULL\n");
50		status = -EINVAL;
51		goto bail;
52	}
53
54	status = ocfs2_read_blocks(ci, off, 1, bh, 0, validate);
55
56bail:
57	return status;
58}
59
60#endif /* 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
31int ocfs2_write_block(struct ocfs2_super          *osb,
32		      struct buffer_head  *bh,
33		      struct ocfs2_caching_info   *ci);
34int ocfs2_read_blocks_sync(struct ocfs2_super *osb, u64 block,
35			   unsigned int nr, struct buffer_head *bhs[]);
36
37/*
38 * If not NULL, validate() will be called on a buffer that is freshly
39 * read from disk.  It will not be called if the buffer was in cache.
40 * Note that if validate() is being used for this buffer, it needs to
41 * be set even for a READAHEAD call, as it marks the buffer for later
42 * validation.
43 */
44int ocfs2_read_blocks(struct ocfs2_caching_info *ci, u64 block, int nr,
45		      struct buffer_head *bhs[], int flags,
46		      int (*validate)(struct super_block *sb,
47				      struct buffer_head *bh));
48
49int 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
55static inline int ocfs2_read_block(struct ocfs2_caching_info *ci, u64 off,
56				   struct buffer_head **bh,
57				   int (*validate)(struct super_block *sb,
58						   struct buffer_head *bh))
59{
60	int status = 0;
61
62	if (bh == NULL) {
63		printk("ocfs2: bh == NULL\n");
64		status = -EINVAL;
65		goto bail;
66	}
67
68	status = ocfs2_read_blocks(ci, off, 1, bh, 0, validate);
69
70bail:
71	return status;
72}
73
74#endif /* OCFS2_BUFFER_HEAD_IO_H */