xref: /illumos-gate/usr/src/uts/common/fs/zfs/sys/metaslab_impl.h (revision 88ecc943b4eb72f7c4fbbd8435997b85ef171fc3)
1fa9e4066Sahrens /*
2fa9e4066Sahrens  * CDDL HEADER START
3fa9e4066Sahrens  *
4fa9e4066Sahrens  * The contents of this file are subject to the terms of the
5ecc2d604Sbonwick  * Common Development and Distribution License (the "License").
6ecc2d604Sbonwick  * You may not use this file except in compliance with the License.
7fa9e4066Sahrens  *
8fa9e4066Sahrens  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9fa9e4066Sahrens  * or http://www.opensolaris.org/os/licensing.
10fa9e4066Sahrens  * See the License for the specific language governing permissions
11fa9e4066Sahrens  * and limitations under the License.
12fa9e4066Sahrens  *
13fa9e4066Sahrens  * When distributing Covered Code, include this CDDL HEADER in each
14fa9e4066Sahrens  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15fa9e4066Sahrens  * If applicable, add the following below this CDDL HEADER, with the
16fa9e4066Sahrens  * fields enclosed by brackets "[]" replaced with your own identifying
17fa9e4066Sahrens  * information: Portions Copyright [yyyy] [name of copyright owner]
18fa9e4066Sahrens  *
19fa9e4066Sahrens  * CDDL HEADER END
20fa9e4066Sahrens  */
21fa9e4066Sahrens /*
22d6e555bdSGeorge Wilson  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
23fa9e4066Sahrens  * Use is subject to license terms.
24fa9e4066Sahrens  */
25fa9e4066Sahrens 
26fa9e4066Sahrens #ifndef _SYS_METASLAB_IMPL_H
27fa9e4066Sahrens #define	_SYS_METASLAB_IMPL_H
28fa9e4066Sahrens 
29fa9e4066Sahrens #include <sys/metaslab.h>
30fa9e4066Sahrens #include <sys/space_map.h>
31fa9e4066Sahrens #include <sys/vdev.h>
32fa9e4066Sahrens #include <sys/txg.h>
33fa9e4066Sahrens #include <sys/avl.h>
34fa9e4066Sahrens 
35fa9e4066Sahrens #ifdef	__cplusplus
36fa9e4066Sahrens extern "C" {
37fa9e4066Sahrens #endif
38fa9e4066Sahrens 
39fa9e4066Sahrens struct metaslab_class {
40*88ecc943SGeorge Wilson 	spa_t			*mc_spa;
41fa9e4066Sahrens 	metaslab_group_t	*mc_rotor;
42fa9e4066Sahrens 	uint64_t		mc_allocated;
43d6e555bdSGeorge Wilson 	space_map_ops_t		*mc_ops;
44fa9e4066Sahrens };
45fa9e4066Sahrens 
46fa9e4066Sahrens struct metaslab_group {
47fa9e4066Sahrens 	kmutex_t		mg_lock;
48fa9e4066Sahrens 	avl_tree_t		mg_metaslab_tree;
49fa9e4066Sahrens 	uint64_t		mg_aliquot;
50fa9e4066Sahrens 	int64_t			mg_bias;
51fa9e4066Sahrens 	metaslab_class_t	*mg_class;
52fa9e4066Sahrens 	vdev_t			*mg_vd;
53fa9e4066Sahrens 	metaslab_group_t	*mg_prev;
54fa9e4066Sahrens 	metaslab_group_t	*mg_next;
55fa9e4066Sahrens };
56fa9e4066Sahrens 
57fa9e4066Sahrens /*
58ecc2d604Sbonwick  * Each metaslab's free space is tracked in space map object in the MOS,
59ecc2d604Sbonwick  * which is only updated in syncing context.  Each time we sync a txg,
60ecc2d604Sbonwick  * we append the allocs and frees from that txg to the space map object.
61ecc2d604Sbonwick  * When the txg is done syncing, metaslab_sync_done() updates ms_smo
62ecc2d604Sbonwick  * to ms_smo_syncing.  Everything in ms_smo is always safe to allocate.
63fa9e4066Sahrens  */
64fa9e4066Sahrens struct metaslab {
65fa9e4066Sahrens 	kmutex_t	ms_lock;	/* metaslab lock		*/
66ecc2d604Sbonwick 	space_map_obj_t	ms_smo;		/* synced space map object	*/
67ecc2d604Sbonwick 	space_map_obj_t	ms_smo_syncing;	/* syncing space map object	*/
68fa9e4066Sahrens 	space_map_t	ms_allocmap[TXG_SIZE];  /* allocated this txg	*/
69fa9e4066Sahrens 	space_map_t	ms_freemap[TXG_SIZE];	/* freed this txg	*/
70fa9e4066Sahrens 	space_map_t	ms_map;		/* in-core free space map	*/
71ecc2d604Sbonwick 	uint64_t	ms_weight;	/* weight vs. others in group	*/
72ecc2d604Sbonwick 	metaslab_group_t *ms_group;	/* metaslab group		*/
73ecc2d604Sbonwick 	avl_node_t	ms_group_node;	/* node in metaslab group tree	*/
74ecc2d604Sbonwick 	txg_node_t	ms_txg_node;	/* per-txg dirty metaslab links	*/
75fa9e4066Sahrens };
76fa9e4066Sahrens 
77fa9e4066Sahrens #ifdef	__cplusplus
78fa9e4066Sahrens }
79fa9e4066Sahrens #endif
80fa9e4066Sahrens 
81fa9e4066Sahrens #endif	/* _SYS_METASLAB_IMPL_H */
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