1*3241b1d3SJoe Thornber /* 2*3241b1d3SJoe Thornber * Copyright (C) 2011 Red Hat, Inc. 3*3241b1d3SJoe Thornber * 4*3241b1d3SJoe Thornber * This file is released under the GPL. 5*3241b1d3SJoe Thornber */ 6*3241b1d3SJoe Thornber 7*3241b1d3SJoe Thornber #ifndef _DM_PERSISTENT_DATA_INTERNAL_H 8*3241b1d3SJoe Thornber #define _DM_PERSISTENT_DATA_INTERNAL_H 9*3241b1d3SJoe Thornber 10*3241b1d3SJoe Thornber #include "dm-block-manager.h" 11*3241b1d3SJoe Thornber 12*3241b1d3SJoe Thornber static inline unsigned dm_hash_block(dm_block_t b, unsigned hash_mask) 13*3241b1d3SJoe Thornber { 14*3241b1d3SJoe Thornber const unsigned BIG_PRIME = 4294967291UL; 15*3241b1d3SJoe Thornber 16*3241b1d3SJoe Thornber return (((unsigned) b) * BIG_PRIME) & hash_mask; 17*3241b1d3SJoe Thornber } 18*3241b1d3SJoe Thornber 19*3241b1d3SJoe Thornber #endif /* _PERSISTENT_DATA_INTERNAL_H */ 20