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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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25
drivers/md/persistent-data/dm-space-map-disk.h Normal file
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/*
* Copyright (C) 2011 Red Hat, Inc.
*
* This file is released under the GPL.
*/
#ifndef _LINUX_DM_SPACE_MAP_DISK_H
#define _LINUX_DM_SPACE_MAP_DISK_H
#include "dm-block-manager.h"
struct dm_space_map;
struct dm_transaction_manager;
/*
* Unfortunately we have to use two-phase construction due to the cycle
* between the tm and sm.
*/
struct dm_space_map *dm_sm_disk_create(struct dm_transaction_manager *tm,
dm_block_t nr_blocks);
struct dm_space_map *dm_sm_disk_open(struct dm_transaction_manager *tm,
void *root, size_t len);
#endif /* _LINUX_DM_SPACE_MAP_DISK_H */