linux/drivers/md/dm-cache-policy.h

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright (C) 2012 Red Hat. All rights reserved.
 *
 * This file is released under the GPL.
 */

#ifndef DM_CACHE_POLICY_H
#define DM_CACHE_POLICY_H

#include "dm-cache-block-types.h"

#include <linux/device-mapper.h>

/*----------------------------------------------------------------*/

/*
 * The cache policy makes the important decisions about which blocks get to
 * live on the faster cache device.
 */
enum policy_operation { … };

/*
 * This is the instruction passed back to the core target.
 */
struct policy_work { … };

/*
 * The cache policy object.  It is envisaged that this structure will be
 * embedded in a bigger, policy specific structure (ie. use container_of()).
 */
struct dm_cache_policy { … };

/*----------------------------------------------------------------*/

/*
 * We maintain a little register of the different policy types.
 */
#define CACHE_POLICY_NAME_SIZE …
#define CACHE_POLICY_VERSION_SIZE …

struct dm_cache_policy_type { … };

int dm_cache_policy_register(struct dm_cache_policy_type *type);
void dm_cache_policy_unregister(struct dm_cache_policy_type *type);

/*----------------------------------------------------------------*/

#endif	/* DM_CACHE_POLICY_H */