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 */ 20