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dm: add persistent data library

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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>
This commit is contained in:
Joe Thornber 2011-10-31 20:19:11 +00:00 • committed by Alasdair G Kergon
parent 95d402f057
commit 3241b1d3e0
22 changed files with 5709 additions and 0 deletions
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19
drivers/md/persistent-data/dm-persistent-data-internal.h Normal file
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/*
* 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 */