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       1                 :            : /*
       2                 :            :  * Copyright (C) 2007 Oracle.  All rights reserved.
       3                 :            :  *
       4                 :            :  * This program is free software; you can redistribute it and/or
       5                 :            :  * modify it under the terms of the GNU General Public
       6                 :            :  * License v2 as published by the Free Software Foundation.
       7                 :            :  *
       8                 :            :  * This program is distributed in the hope that it will be useful,
       9                 :            :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      10                 :            :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      11                 :            :  * General Public License for more details.
      12                 :            :  *
      13                 :            :  * You should have received a copy of the GNU General Public
      14                 :            :  * License along with this program; if not, write to the
      15                 :            :  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
      16                 :            :  * Boston, MA 021110-1307, USA.
      17                 :            :  */
      18                 :            : 
      19                 :            : #ifndef __HASH__
      20                 :            : #define __HASH__
      21                 :            : 
      22                 :            : #include <linux/crc32c.h>
      23                 :            : static inline u64 btrfs_name_hash(const char *name, int len)
      24                 :            : {
      25                 :          0 :         return crc32c((u32)~1, name, len);
      26                 :            : }
      27                 :            : 
      28                 :            : /*
      29                 :            :  * Figure the key offset of an extended inode ref
      30                 :            :  */
      31                 :            : static inline u64 btrfs_extref_hash(u64 parent_objectid, const char *name,
      32                 :            :                                     int len)
      33                 :            : {
      34                 :          0 :         return (u64) crc32c(parent_objectid, name, len);
      35                 :            : }
      36                 :            : 
      37                 :            : #endif