/*
* Copyright (C) 2012 Red Hat, Inc.
*
* This file is released under the GPL.
*/
#include "dm-cache-metadata.h"
#include "persistent-data/dm-array.h"
#include "persistent-data/dm-bitset.h"
#include "persistent-data/dm-space-map.h"
#include "persistent-data/dm-space-map-disk.h"
#include "persistent-data/dm-transaction-manager.h"
#include <linux/device-mapper.h>
/*----------------------------------------------------------------*/
#define DM_MSG_PREFIX "cache metadata"
#define CACHE_SUPERBLOCK_MAGIC 06142003
#define CACHE_SUPERBLOCK_LOCATION 0
/*
* defines a range of metadata versions that this module can handle.
*/
#define MIN_CACHE_VERSION 1
#define MAX_CACHE_VERSION 1
#define CACHE_METADATA_CACHE_SIZE 64
/*
* 3 for btree insert +
* 2 for btree lookup used within space map
*/
#define CACHE_MAX_CONCURRENT_LOCKS 5
#define SPACE_MAP_ROOT_SIZE 128
enum superblock_flag_bits {
/* for spotting crashes that would invalidate the dirty bitset */
CLEAN_SHUTDOWN,
/* metadata must be checked using the tools */
NEEDS_CHECK,
};
/*
* Each mapping from cache block -> origin block carries a set of flags.
*/
enum mapping_bits {
/*
* A valid mapping. Because we're using an array we clear this
* flag for an non existant mapping.
*/
M_VALID = 1,
/*
* The data on the cache is different from that on the origin.
*/
M_DIRTY = 2
