117 lines
4.1 KiB
C
117 lines
4.1 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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/*
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* Copyright (c) 2013 by Delphix. All rights reserved.
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*/
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#ifndef _SYS_METASLAB_IMPL_H
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#define _SYS_METASLAB_IMPL_H
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#include <sys/metaslab.h>
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#include <sys/space_map.h>
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#include <sys/vdev.h>
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#include <sys/txg.h>
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#include <sys/avl.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct metaslab_class {
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spa_t *mc_spa;
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metaslab_group_t *mc_rotor;
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space_map_ops_t *mc_ops;
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uint64_t mc_aliquot;
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uint64_t mc_alloc_groups; /* # of allocatable groups */
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uint64_t mc_alloc; /* total allocated space */
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uint64_t mc_deferred; /* total deferred frees */
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uint64_t mc_space; /* total space (alloc + free) */
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uint64_t mc_dspace; /* total deflated space */
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kmutex_t mc_fastwrite_lock;
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};
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struct metaslab_group {
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kmutex_t mg_lock;
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avl_tree_t mg_metaslab_tree;
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uint64_t mg_aliquot;
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uint64_t mg_bonus_area;
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uint64_t mg_alloc_failures;
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boolean_t mg_allocatable; /* can we allocate? */
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uint64_t mg_free_capacity; /* percentage free */
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int64_t mg_bias;
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int64_t mg_activation_count;
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metaslab_class_t *mg_class;
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vdev_t *mg_vd;
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metaslab_group_t *mg_prev;
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metaslab_group_t *mg_next;
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};
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/*
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* Each metaslab maintains an in-core free map (ms_map) that contains the
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* current list of free segments. As blocks are allocated, the allocated
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* segment is removed from the ms_map and added to a per txg allocation map.
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* As blocks are freed, they are added to the per txg free map. These per
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* txg maps allow us to process all allocations and frees in syncing context
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* where it is safe to update the on-disk space maps.
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*
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* Each metaslab's free space is tracked in a space map object in the MOS,
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* which is only updated in syncing context. Each time we sync a txg,
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* we append the allocs and frees from that txg to the space map object.
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* When the txg is done syncing, metaslab_sync_done() updates ms_smo
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* to ms_smo_syncing. Everything in ms_smo is always safe to allocate.
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*
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* To load the in-core free map we read the space map object from disk.
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* This object contains a series of alloc and free records that are
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* combined to make up the list of all free segments in this metaslab. These
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* segments are represented in-core by the ms_map and are stored in an
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* AVL tree.
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*
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* As the space map objects grows (as a result of the appends) it will
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* eventually become space-inefficient. When the space map object is
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* zfs_condense_pct/100 times the size of the minimal on-disk representation,
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* we rewrite it in its minimized form.
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*/
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struct metaslab {
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kmutex_t ms_lock; /* metaslab lock */
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space_map_obj_t ms_smo; /* synced space map object */
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space_map_obj_t ms_smo_syncing; /* syncing space map object */
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space_map_t *ms_allocmap[TXG_SIZE]; /* allocated this txg */
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space_map_t *ms_freemap[TXG_SIZE]; /* freed this txg */
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space_map_t *ms_defermap[TXG_DEFER_SIZE]; /* deferred frees */
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space_map_t *ms_map; /* in-core free space map */
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int64_t ms_deferspace; /* sum of ms_defermap[] space */
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uint64_t ms_weight; /* weight vs. others in group */
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metaslab_group_t *ms_group; /* metaslab group */
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avl_node_t ms_group_node; /* node in metaslab group tree */
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txg_node_t ms_txg_node; /* per-txg dirty metaslab links */
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};
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SYS_METASLAB_IMPL_H */
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