include/sys/metaslab_impl.h

   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 */