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+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#ifndef _SYS_METASLAB_IMPL_H
+#define _SYS_METASLAB_IMPL_H
+
+#include <sys/metaslab.h>
+#include <sys/space_map.h>
+#include <sys/vdev.h>
+#include <sys/txg.h>
+#include <sys/avl.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct metaslab_class {
+ spa_t *mc_spa;
+ metaslab_group_t *mc_rotor;
+ space_map_ops_t *mc_ops;
+ uint64_t mc_aliquot;
+ uint64_t mc_alloc; /* total allocated space */
+ uint64_t mc_deferred; /* total deferred frees */
+ uint64_t mc_space; /* total space (alloc + free) */
+ uint64_t mc_dspace; /* total deflated space */
+};
+
+struct metaslab_group {
+ kmutex_t mg_lock;
+ avl_tree_t mg_metaslab_tree;
+ uint64_t mg_aliquot;
+ uint64_t mg_bonus_area;
+ int64_t mg_bias;
+ int64_t mg_activation_count;
+ metaslab_class_t *mg_class;
+ vdev_t *mg_vd;
+ metaslab_group_t *mg_prev;
+ metaslab_group_t *mg_next;
+};
+
+/*
+ * Each metaslab's free space is tracked in space map object in the MOS,
+ * which is only updated in syncing context. Each time we sync a txg,
+ * we append the allocs and frees from that txg to the space map object.
+ * When the txg is done syncing, metaslab_sync_done() updates ms_smo
+ * to ms_smo_syncing. Everything in ms_smo is always safe to allocate.
+ */
+struct metaslab {
+ kmutex_t ms_lock; /* metaslab lock */
+ space_map_obj_t ms_smo; /* synced space map object */
+ space_map_obj_t ms_smo_syncing; /* syncing space map object */
+ space_map_t ms_allocmap[TXG_SIZE]; /* allocated this txg */
+ space_map_t ms_freemap[TXG_SIZE]; /* freed this txg */
+ space_map_t ms_defermap[TXG_DEFER_SIZE]; /* deferred frees */
+ space_map_t ms_map; /* in-core free space map */
+ int64_t ms_deferspace; /* sum of ms_defermap[] space */
+ uint64_t ms_weight; /* weight vs. others in group */
+ metaslab_group_t *ms_group; /* metaslab group */
+ avl_node_t ms_group_node; /* node in metaslab group tree */
+ txg_node_t ms_txg_node; /* per-txg dirty metaslab links */
+};
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _SYS_METASLAB_IMPL_H */