| Joe Thornber | 3241b1d | 2011-10-31 20:19:11 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2011 Red Hat, Inc. | ||||
| 3 | * | ||||
| 4 | * This file is released under the GPL. | ||||
| 5 | */ | ||||
| 6 | |||||
| 7 | #ifndef _DM_PERSISTENT_DATA_INTERNAL_H | ||||
| 8 | #define _DM_PERSISTENT_DATA_INTERNAL_H | ||||
| 9 | |||||
| 10 | #include "dm-block-manager.h" | ||||
| 11 | |||||
| 12 | static inline unsigned dm_hash_block(dm_block_t b, unsigned hash_mask) | ||||
| 13 | { | ||||
| 14 | const unsigned BIG_PRIME = 4294967291UL; | ||||
| 15 | |||||
| 16 | return (((unsigned) b) * BIG_PRIME) & hash_mask; | ||||
| 17 | } | ||||
| 18 | |||||
| 19 | #endif /* _PERSISTENT_DATA_INTERNAL_H */ | ||||