xref: /linux/drivers/md/persistent-data/dm-persistent-data-internal.h (revision 9a87ffc99ec8eb8d35eed7c4f816d75f5cc9662e) 
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 
dm_hash_block(dm_block_t b,unsigned int hash_mask)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