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/*
* Copyright (C) 2012 Red Hat, Inc.
*
* This file is released under the GPL.
*/
#ifndef DM_CACHE_METADATA_H
#define DM_CACHE_METADATA_H
#include "dm-cache-block-types.h"
#include "dm-cache-policy-internal.h"
#include "persistent-data/dm-space-map-metadata.h"
/*----------------------------------------------------------------*/
#define DM_CACHE_METADATA_BLOCK_SIZE DM_SM_METADATA_BLOCK_SIZE
/* FIXME: remove this restriction */
/*
* The metadata device is currently limited in size.
*/
#define DM_CACHE_METADATA_MAX_SECTORS DM_SM_METADATA_MAX_SECTORS
/*
* A metadata device larger than 16GB triggers a warning.
*/
#define DM_CACHE_METADATA_MAX_SECTORS_WARNING (16 * (1024 * 1024 * 1024 >> SECTOR_SHIFT))
/*----------------------------------------------------------------*/
/*
* Ext[234]-style compat feature flags.
*
* A new feature which old metadata will still be compatible with should
* define a DM_CACHE_FEATURE_COMPAT_* flag (rarely useful).
*
* A new feature that is not compatible with old code should define a
* DM_CACHE_FEATURE_INCOMPAT_* flag and guard the relevant code with
* that flag.
*
* A new feature that is not compatible with old code accessing the
* metadata RDWR should define a DM_CACHE_FEATURE_RO_COMPAT_* flag and
* guard the relevant code with that flag.
*
* As these various flags are defined they should be added to the
* following masks.
*/
#define DM_CACHE_FEATURE_COMPAT_SUPP 0UL
#define DM_CACHE_FEATURE_COMPAT_RO_SUPP 0UL
#define DM_CACHE_FEATURE_INCOMPAT_SUPP 0UL
/*
* Reopens or creates a new, empty metadata volume.
* Returns an ERR_PTR on failure.
*/
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