44 lines
1.2 KiB
C
44 lines
1.2 KiB
C
/*
|
|
* 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);
|
|
const char* btrfs_crc32c_impl(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
|