75 строки
2.3 KiB
C
75 строки
2.3 KiB
C
/* -*- mode: c; c-basic-offset: 8; -*-
|
|
* vim: noexpandtab sw=8 ts=8 sts=0:
|
|
*
|
|
* ocfs2_buffer_head.h
|
|
*
|
|
* Buffer cache handling functions defined
|
|
*
|
|
* Copyright (C) 2002, 2004 Oracle. All rights reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2 of the License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public
|
|
* License along with this program; if not, write to the
|
|
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
* Boston, MA 021110-1307, USA.
|
|
*/
|
|
|
|
#ifndef OCFS2_BUFFER_HEAD_IO_H
|
|
#define OCFS2_BUFFER_HEAD_IO_H
|
|
|
|
#include <linux/buffer_head.h>
|
|
|
|
int ocfs2_write_block(struct ocfs2_super *osb,
|
|
struct buffer_head *bh,
|
|
struct ocfs2_caching_info *ci);
|
|
int ocfs2_read_blocks_sync(struct ocfs2_super *osb, u64 block,
|
|
unsigned int nr, struct buffer_head *bhs[]);
|
|
|
|
/*
|
|
* If not NULL, validate() will be called on a buffer that is freshly
|
|
* read from disk. It will not be called if the buffer was in cache.
|
|
* Note that if validate() is being used for this buffer, it needs to
|
|
* be set even for a READAHEAD call, as it marks the buffer for later
|
|
* validation.
|
|
*/
|
|
int ocfs2_read_blocks(struct ocfs2_caching_info *ci, u64 block, int nr,
|
|
struct buffer_head *bhs[], int flags,
|
|
int (*validate)(struct super_block *sb,
|
|
struct buffer_head *bh));
|
|
|
|
int ocfs2_write_super_or_backup(struct ocfs2_super *osb,
|
|
struct buffer_head *bh);
|
|
|
|
#define OCFS2_BH_IGNORE_CACHE 1
|
|
#define OCFS2_BH_READAHEAD 8
|
|
|
|
static inline int ocfs2_read_block(struct ocfs2_caching_info *ci, u64 off,
|
|
struct buffer_head **bh,
|
|
int (*validate)(struct super_block *sb,
|
|
struct buffer_head *bh))
|
|
{
|
|
int status = 0;
|
|
|
|
if (bh == NULL) {
|
|
printk("ocfs2: bh == NULL\n");
|
|
status = -EINVAL;
|
|
goto bail;
|
|
}
|
|
|
|
status = ocfs2_read_blocks(ci, off, 1, bh, 0, validate);
|
|
|
|
bail:
|
|
return status;
|
|
}
|
|
|
|
#endif /* OCFS2_BUFFER_HEAD_IO_H */
|