/* -*- mode: c; c-basic-offset: 8; -*-
   * vim: noexpandtab sw=8 ts=8 sts=0:
   *
   * extent_map.h
   *
   * In-memory file extent mappings for OCFS2.
   *
   * Copyright (C) 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, version 2,  as published by the Free Software Foundation.
   *
   * 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 _EXTENT_MAP_H
  #define _EXTENT_MAP_H

  struct ocfs2_extent_map_item {
  	unsigned int			ei_cpos;
  	unsigned int			ei_phys;
  	unsigned int			ei_clusters;
  	unsigned int			ei_flags;
  
  	struct list_head		ei_list;
  };
  
  #define OCFS2_MAX_EXTENT_MAP_ITEMS			3
  struct ocfs2_extent_map {
  	unsigned int			em_num_items;
  	struct list_head		em_list;
  };
  
  void ocfs2_extent_map_init(struct inode *inode);
  void ocfs2_extent_map_trunc(struct inode *inode, unsigned int cluster);
  void ocfs2_extent_map_insert_rec(struct inode *inode,
  				 struct ocfs2_extent_rec *rec);

  int ocfs2_get_clusters(struct inode *inode, u32 v_cluster, u32 *p_cluster,

  		       u32 *num_clusters, unsigned int *extent_flags);

  int ocfs2_extent_map_get_blocks(struct inode *inode, u64 v_blkno, u64 *p_blkno,

  				u64 *ret_count, unsigned int *extent_flags);

  int ocfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
  		 u64 map_start, u64 map_len);

  int ocfs2_seek_data_hole_offset(struct file *file, loff_t *offset, int origin);

  int ocfs2_xattr_get_clusters(struct inode *inode, u32 v_cluster,
  			     u32 *p_cluster, u32 *num_clusters,

  			     struct ocfs2_extent_list *el,
  			     unsigned int *extent_flags);

  int ocfs2_read_virt_blocks(struct inode *inode, u64 v_block, int nr,
  			   struct buffer_head *bhs[], int flags,
  			   int (*validate)(struct super_block *sb,
  					   struct buffer_head *bh));

  int ocfs2_figure_hole_clusters(struct ocfs2_caching_info *ci,
  			       struct ocfs2_extent_list *el,
  			       struct buffer_head *eb_bh,
  			       u32 v_cluster,
  			       u32 *num_clusters);

  static inline int ocfs2_read_virt_block(struct inode *inode, u64 v_block,
  					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_virt_blocks(inode, v_block, 1, bh, 0, validate);
  
  bail:
  	return status;
  }

  #endif  /* _EXTENT_MAP_H */