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3241b1d3 JT |
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 */ |