[deliverable/linux.git] / drivers / md / persistent-data / dm-persistent-data-internal.h

/*
 * Copyright (C) 2011 Red Hat, Inc.
 *
 * This file is released under the GPL.
 */

#ifndef _DM_PERSISTENT_DATA_INTERNAL_H
#define _DM_PERSISTENT_DATA_INTERNAL_H

#include "dm-block-manager.h"

static inline unsigned dm_hash_block(dm_block_t b, unsigned hash_mask)
{
	const unsigned BIG_PRIME = 4294967291UL;

	return (((unsigned) b) * BIG_PRIME) & hash_mask;
}

#endif	/* _PERSISTENT_DATA_INTERNAL_H */
Commit	Line	Data
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 */