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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 2009 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 #include <sys/metaslab.h>
     30 #include <sys/space_map.h>
     31 #include <sys/vdev.h>
     32 #include <sys/txg.h>
     33 #include <sys/avl.h>
     34 
     35 #ifdef	__cplusplus
     36 extern "C" {
     37 #endif
     38 
     39 struct metaslab_class {
     40 	spa_t			*mc_spa;
     41 	metaslab_group_t	*mc_rotor;
     42 	space_map_ops_t		*mc_ops;
     43 	uint64_t		mc_aliquot;
     44 	uint64_t		mc_alloc;	/* total allocated space */
     45 	uint64_t		mc_deferred;	/* total deferred frees */
     46 	uint64_t		mc_space;	/* total space (alloc + free) */
     47 	uint64_t		mc_dspace;	/* total deflated space */
     48 };
     49 
     50 struct metaslab_group {
     51 	kmutex_t		mg_lock;
     52 	avl_tree_t		mg_metaslab_tree;
     53 	uint64_t		mg_aliquot;
     54 	uint64_t		mg_bonus_area;
     55 	int64_t			mg_bias;
     56 	int64_t			mg_activation_count;
     57 	metaslab_class_t	*mg_class;
     58 	vdev_t			*mg_vd;
     59 	metaslab_group_t	*mg_prev;
     60 	metaslab_group_t	*mg_next;
     61 };
     62 
     63 /*
     64  * Each metaslab's free space is tracked in space map object in the MOS,
     65  * which is only updated in syncing context.  Each time we sync a txg,
     66  * we append the allocs and frees from that txg to the space map object.
     67  * When the txg is done syncing, metaslab_sync_done() updates ms_smo
     68  * to ms_smo_syncing.  Everything in ms_smo is always safe to allocate.
     69  */
     70 struct metaslab {
     71 	kmutex_t	ms_lock;	/* metaslab lock		*/
     72 	space_map_obj_t	ms_smo;		/* synced space map object	*/
     73 	space_map_obj_t	ms_smo_syncing;	/* syncing space map object	*/
     74 	space_map_t	ms_allocmap[TXG_SIZE];  /* allocated this txg	*/
     75 	space_map_t	ms_freemap[TXG_SIZE];	/* freed this txg	*/
     76 	space_map_t	ms_defermap[TXG_DEFER_SIZE]; /* deferred frees	*/
     77 	space_map_t	ms_map;		/* in-core free space map	*/
     78 	int64_t		ms_deferspace;	/* sum of ms_defermap[] space	*/
     79 	uint64_t	ms_weight;	/* weight vs. others in group	*/
     80 	metaslab_group_t *ms_group;	/* metaslab group		*/
     81 	avl_node_t	ms_group_node;	/* node in metaslab group tree	*/
     82 	txg_node_t	ms_txg_node;	/* per-txg dirty metaslab links	*/
     83 };
     84 
     85 #ifdef	__cplusplus
     86 }
     87 #endif
     88 
     89 #endif	/* _SYS_METASLAB_IMPL_H */
     90