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
36extern "C" {
37#endif
38
39struct 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
50struct 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 */
70struct 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