/*

 * CDDL HEADER START

 *

 * The contents of this file are subject to the terms of the

 * Common Development and Distribution License (the "License").

 * You may not use this file except in compliance with the License.

 *

 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE

 * or http://www.opensolaris.org/os/licensing.

 * See the License for the specific language governing permissions

 * and limitations under the License.

 *

 * When distributing Covered Code, include this CDDL HEADER in each

 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.

 * If applicable, add the following below this CDDL HEADER, with the

 * fields enclosed by brackets "[]" replaced with your own identifying

 * information: Portions Copyright [yyyy] [name of copyright owner]

 *

 * CDDL HEADER END

 */

/*

 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.

 * Use is subject to license terms.

 */

#ifndef _SYS_METASLAB_IMPL_H

#define	_SYS_METASLAB_IMPL_H

#include <sys/metaslab.h>

#include <sys/space_map.h>

#include <sys/vdev.h>

#include <sys/txg.h>

#include <sys/avl.h>

#ifdef	__cplusplus

extern "C" {

#endif

struct metaslab_class {

	spa_t			*mc_spa;

	metaslab_group_t	*mc_rotor;

	space_map_ops_t		*mc_ops;

};

struct metaslab_group {

	kmutex_t		mg_lock;

	avl_tree_t		mg_metaslab_tree;

	uint64_t		mg_aliquot;

	int64_t			mg_bias;

	metaslab_class_t	*mg_class;

	vdev_t			*mg_vd;

	metaslab_group_t	*mg_prev;

	metaslab_group_t	*mg_next;

};

/*

 * Each metaslab's free space is tracked in space map object in the MOS,

 * which is only updated in syncing context.  Each time we sync a txg,

 * we append the allocs and frees from that txg to the space map object.

 * When the txg is done syncing, metaslab_sync_done() updates ms_smo

 * to ms_smo_syncing.  Everything in ms_smo is always safe to allocate.

 */

struct metaslab {

	kmutex_t	ms_lock;	/* metaslab lock		*/

	space_map_obj_t	ms_smo;		/* synced space map object	*/

	space_map_obj_t	ms_smo_syncing;	/* syncing space map object	*/

	space_map_t	ms_allocmap[TXG_SIZE];  /* allocated this txg	*/

	space_map_t	ms_freemap[TXG_SIZE];	/* freed this txg	*/

	space_map_t	ms_defermap[TXG_DEFER_SIZE]; /* deferred frees	*/

	space_map_t	ms_map;		/* in-core free space map	*/

	int64_t		ms_deferspace;	/* sum of ms_defermap[] space	*/

	uint64_t	ms_weight;	/* weight vs. others in group	*/

	metaslab_group_t *ms_group;	/* metaslab group		*/

	avl_node_t	ms_group_node;	/* node in metaslab group tree	*/

	txg_node_t	ms_txg_node;	/* per-txg dirty metaslab links	*/

};

#ifdef	__cplusplus

}

#endif

#endif	/* _SYS_METASLAB_IMPL_H */