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      1 /*
      2  * CDDL HEADER START
      3  *
      4  * The contents of this file are subject to the terms of the
      5  * Common Development and Distribution License (the "License").
      6  * You may not use this file except in compliance with the License.
      7  *
      8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      9  * or http://www.opensolaris.org/os/licensing.
     10  * See the License for the specific language governing permissions
     11  * and limitations under the License.
     12  *
     13  * When distributing Covered Code, include this CDDL HEADER in each
     14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     15  * If applicable, add the following below this CDDL HEADER, with the
     16  * fields enclosed by brackets "[]" replaced with your own identifying
     17  * information: Portions Copyright [yyyy] [name of copyright owner]
     18  *
     19  * CDDL HEADER END
     20  */
     21 /*
     22  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
     23  * Use is subject to license terms.
     24  */
     25 
     26 #ifndef _SYS_METASLAB_IMPL_H
     27 #define	_SYS_METASLAB_IMPL_H
     28 
     29 #pragma ident	"@(#)metaslab_impl.h	1.2	06/04/02 SMI"
     30 
     31 #include <sys/metaslab.h>
     32 #include <sys/space_map.h>
     33 #include <sys/vdev.h>
     34 #include <sys/txg.h>
     35 #include <sys/avl.h>
     36 
     37 #ifdef	__cplusplus
     38 extern "C" {
     39 #endif
     40 
     41 struct metaslab_class {
     42 	metaslab_group_t	*mc_rotor;
     43 	uint64_t		mc_allocated;
     44 };
     45 
     46 struct metaslab_group {
     47 	kmutex_t		mg_lock;
     48 	avl_tree_t		mg_metaslab_tree;
     49 	uint64_t		mg_aliquot;
     50 	int64_t			mg_bias;
     51 	metaslab_class_t	*mg_class;
     52 	vdev_t			*mg_vd;
     53 	metaslab_group_t	*mg_prev;
     54 	metaslab_group_t	*mg_next;
     55 };
     56 
     57 /*
     58  * Each metaslab's free space is tracked in space map object in the MOS,
     59  * which is only updated in syncing context.  Each time we sync a txg,
     60  * we append the allocs and frees from that txg to the space map object.
     61  * When the txg is done syncing, metaslab_sync_done() updates ms_smo
     62  * to ms_smo_syncing.  Everything in ms_smo is always safe to allocate.
     63  */
     64 struct metaslab {
     65 	kmutex_t	ms_lock;	/* metaslab lock		*/
     66 	space_map_obj_t	ms_smo;		/* synced space map object	*/
     67 	space_map_obj_t	ms_smo_syncing;	/* syncing space map object	*/
     68 	space_map_t	ms_allocmap[TXG_SIZE];  /* allocated this txg	*/
     69 	space_map_t	ms_freemap[TXG_SIZE];	/* freed this txg	*/
     70 	space_map_t	ms_map;		/* in-core free space map	*/
     71 	uint64_t	ms_weight;	/* weight vs. others in group	*/
     72 	metaslab_group_t *ms_group;	/* metaslab group		*/
     73 	avl_node_t	ms_group_node;	/* node in metaslab group tree	*/
     74 	txg_node_t	ms_txg_node;	/* per-txg dirty metaslab links	*/
     75 };
     76 
     77 #ifdef	__cplusplus
     78 }
     79 #endif
     80 
     81 #endif	/* _SYS_METASLAB_IMPL_H */
     82