/* -*- 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>
  
  void ocfs2_end_buffer_io_sync(struct buffer_head *bh,
  			     int uptodate);

  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
  ");
  		status = -EINVAL;
  		goto bail;
  	}

  	status = ocfs2_read_blocks(ci, off, 1, bh, 0, validate);

  
  bail:
  	return status;
  }
  
  #endif /* OCFS2_BUFFER_HEAD_IO_H */