1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (C) 2011 Red Hat, Inc. 4 * 5 * This file is released under the GPL. 6 */ 7 8 #ifndef _DM_PERSISTENT_DATA_INTERNAL_H 9 #define _DM_PERSISTENT_DATA_INTERNAL_H 10 11 #include "dm-block-manager.h" 12 13 static inline unsigned int dm_hash_block(dm_block_t b, unsigned int hash_mask) 14 { 15 const unsigned int BIG_PRIME = 4294967291UL; 16 17 return (((unsigned int) b) * BIG_PRIME) & hash_mask; 18 } 19 20 #endif /* _PERSISTENT_DATA_INTERNAL_H */ 21