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  * Copyright (c) 2011 by Delphix. All rights reserved.
  25  */
  26
  27 #ifndef _SYS_METASLAB_IMPL_H
  28 #define _SYS_METASLAB_IMPL_H
  29
  30 #include <sys/metaslab.h>
  31 #include <sys/space_map.h>
  32 #include <sys/vdev.h>
  33 #include <sys/txg.h>
  34 #include <sys/avl.h>
  35
  36 #ifdef  __cplusplus
  37 extern "C" {
  38 #endif
  39
  40 struct metaslab_class {
  41         spa_t                   *mc_spa;
  42         metaslab_group_t        *mc_rotor;
  43         space_map_ops_t         *mc_ops;
  44         uint64_t                mc_aliquot;
  45         uint64_t                mc_alloc;       /* total allocated space */
  46         uint64_t                mc_deferred;    /* total deferred frees */
  47         uint64_t                mc_space;       /* total space (alloc + free) */
  48         uint64_t                mc_dspace;      /* total deflated space */
  49 };
  50
  51 struct metaslab_group {
  52         kmutex_t                mg_lock;
  53         avl_tree_t              mg_metaslab_tree;
  54         uint64_t                mg_aliquot;
  55         uint64_t                mg_bonus_area;
  56         uint64_t                mg_alloc_failures;
  57         int64_t                 mg_bias;
  58         int64_t                 mg_activation_count;
  59         metaslab_class_t        *mg_class;
  60         vdev_t                  *mg_vd;
  61         metaslab_group_t        *mg_prev;
  62         metaslab_group_t        *mg_next;
  63 };
  64
  65 /*
  66  * Each metaslab's free space is tracked in space map object in the MOS,
  67  * which is only updated in syncing context.  Each time we sync a txg,
  68  * we append the allocs and frees from that txg to the space map object.
  69  * When the txg is done syncing, metaslab_sync_done() updates ms_smo
  70  * to ms_smo_syncing.  Everything in ms_smo is always safe to allocate.
  71  */
  72 struct metaslab {
  73         kmutex_t        ms_lock;        /* metaslab lock                */
  74         space_map_obj_t ms_smo;         /* synced space map object      */
  75         space_map_obj_t ms_smo_syncing; /* syncing space map object     */
  76         space_map_t     ms_allocmap[TXG_SIZE];  /* allocated this txg   */
  77         space_map_t     ms_freemap[TXG_SIZE];   /* freed this txg       */
  78         space_map_t     ms_defermap[TXG_DEFER_SIZE]; /* deferred frees  */
  79         space_map_t     ms_map;         /* in-core free space map       */
  80         int64_t         ms_deferspace;  /* sum of ms_defermap[] space   */
  81         uint64_t        ms_weight;      /* weight vs. others in group   */
  82         metaslab_group_t *ms_group;     /* metaslab group               */
  83         avl_node_t      ms_group_node;  /* node in metaslab group tree  */
  84         txg_node_t      ms_txg_node;    /* per-txg dirty metaslab links */
  85 };
  86
  87 #ifdef  __cplusplus
  88 }
  89 #endif
  90
  91 #endif  /* _SYS_METASLAB_IMPL_H */