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The persistent-data library offers a re-usable framework for the storage and management of on-disk metadata in device-mapper targets. It's used by the thin-provisioning target in the next patch and in an upcoming hierarchical storage target. For further information, please read Documentation/device-mapper/persistent-data.txt Signed-off-by: Joe Thornber <thornber@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
20 lines
407 B
C
20 lines
407 B
C
/*
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* Copyright (C) 2011 Red Hat, Inc.
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*
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* This file is released under the GPL.
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*/
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#ifndef _DM_PERSISTENT_DATA_INTERNAL_H
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#define _DM_PERSISTENT_DATA_INTERNAL_H
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#include "dm-block-manager.h"
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static inline unsigned dm_hash_block(dm_block_t b, unsigned hash_mask)
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{
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const unsigned BIG_PRIME = 4294967291UL;
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return (((unsigned) b) * BIG_PRIME) & hash_mask;
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}
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#endif /* _PERSISTENT_DATA_INTERNAL_H */
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