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
22int __init btrfs_hash_init(void);
23
24void btrfs_hash_exit(void);
25const char* btrfs_crc32c_impl(void);
26
27u32 btrfs_crc32c(u32 crc, const void *address, unsigned int length);
28
29static inline u64 btrfs_name_hash(const char *name, int len)
30{
31	return btrfs_crc32c((u32)~1, name, len);
32}
33
34/*
35 * Figure the key offset of an extended inode ref
36 */
37static inline u64 btrfs_extref_hash(u64 parent_objectid, const char *name,
38				    int len)
39{
40	return (u64) btrfs_crc32c(parent_objectid, name, len);
41}
42
43#endif