/* -*- mode: c; c-basic-offset: 8; -*-
   * vim: noexpandtab sw=8 ts=8 sts=0:
   *
   * slotmap.h
   *
   * description here
   *
   * 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 SLOTMAP_H
  #define SLOTMAP_H
  
  struct ocfs2_slot_info {
  	spinlock_t si_lock;
  
         	struct inode *si_inode;
  	struct buffer_head *si_bh;
  	unsigned int si_num_slots;
  	unsigned int si_size;
  	s16 si_global_node_nums[OCFS2_MAX_SLOTS];
  };
  
  int ocfs2_init_slot_info(struct ocfs2_super *osb);
  void ocfs2_free_slot_info(struct ocfs2_slot_info *si);
  
  int ocfs2_find_slot(struct ocfs2_super *osb);
  void ocfs2_put_slot(struct ocfs2_super *osb);
  
  void ocfs2_update_slot_info(struct ocfs2_slot_info *si);
  int ocfs2_update_disk_slots(struct ocfs2_super *osb,
  			    struct ocfs2_slot_info *si);
  
  s16 ocfs2_node_num_to_slot(struct ocfs2_slot_info *si,
  			   s16 global);
  void ocfs2_clear_slot(struct ocfs2_slot_info *si,
  		      s16 slot_num);

  static inline int ocfs2_is_empty_slot(struct ocfs2_slot_info *si,
  				      int slot_num)
  {
  	BUG_ON(slot_num == OCFS2_INVALID_SLOT);
  	assert_spin_locked(&si->si_lock);
  
  	return si->si_global_node_nums[slot_num] == OCFS2_INVALID_SLOT;
  }
  
  #endif