/*
   * Copyright (C) 2007 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 v2 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 __HASH__
  #define __HASH__

  int __init btrfs_hash_init(void);
  
  void btrfs_hash_exit(void);
  
  u32 btrfs_crc32c(u32 crc, const void *address, unsigned int length);

  static inline u64 btrfs_name_hash(const char *name, int len)
  {

  	return btrfs_crc32c((u32)~1, name, len);

  }

  
  /*
   * Figure the key offset of an extended inode ref
   */
  static inline u64 btrfs_extref_hash(u64 parent_objectid, const char *name,
  				    int len)
  {

  	return (u64) btrfs_crc32c(parent_objectid, name, len);

  }

  #endif