/*
   * Copyright (c) 2006-2007 Silicon Graphics, Inc.
   * 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.
   *
   * This program is distributed in the hope that it would 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 the Free Software Foundation,
   * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
   */
  #ifndef __XFS_MRU_CACHE_H__
  #define __XFS_MRU_CACHE_H__

  struct xfs_mru_cache;

  struct xfs_mru_cache_elem {
  	struct list_head list_node;
  	unsigned long	key;
  };

  /* Function pointer type for callback to free a client's data pointer. */
  typedef void (*xfs_mru_cache_free_func_t)(struct xfs_mru_cache_elem *elem);

  
  int xfs_mru_cache_init(void);
  void xfs_mru_cache_uninit(void);
  int xfs_mru_cache_create(struct xfs_mru_cache **mrup, unsigned int lifetime_ms,
  			     unsigned int grp_count,
  			     xfs_mru_cache_free_func_t free_func);

  void xfs_mru_cache_destroy(struct xfs_mru_cache *mru);
  int xfs_mru_cache_insert(struct xfs_mru_cache *mru, unsigned long key,

  		struct xfs_mru_cache_elem *elem);
  struct xfs_mru_cache_elem *
  xfs_mru_cache_remove(struct xfs_mru_cache *mru, unsigned long key);

  void xfs_mru_cache_delete(struct xfs_mru_cache *mru, unsigned long key);

  struct xfs_mru_cache_elem *
  xfs_mru_cache_lookup(struct xfs_mru_cache *mru, unsigned long key);

  void xfs_mru_cache_done(struct xfs_mru_cache *mru);
  
  #endif /* __XFS_MRU_CACHE_H__ */