| Kyle Swenson | 8d8f654 | 2021-03-15 11:02:55 -0600 | [diff] [blame^] | 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 | int __init btrfs_hash_init(void); |
| 23 | |
| 24 | void btrfs_hash_exit(void); |
| 25 | |
| 26 | u32 btrfs_crc32c(u32 crc, const void *address, unsigned int length); |
| 27 | |
| 28 | static inline u64 btrfs_name_hash(const char *name, int len) |
| 29 | { |
| 30 | return btrfs_crc32c((u32)~1, name, len); |
| 31 | } |
| 32 | |
| 33 | /* |
| 34 | * Figure the key offset of an extended inode ref |
| 35 | */ |
| 36 | static inline u64 btrfs_extref_hash(u64 parent_objectid, const char *name, |
| 37 | int len) |
| 38 | { |
| 39 | return (u64) btrfs_crc32c(parent_objectid, name, len); |
| 40 | } |
| 41 | |
| 42 | #endif |