module/zfs/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 2006 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 #pragma ident   "%Z%%M% %I%     %E% SMI"
  30
  31 #include <sys/metaslab.h>
  32 #include <sys/space_map.h>
  33 #include <sys/vdev.h>
  34 #include <sys/txg.h>
  35 #include <sys/avl.h>
  36
  37 #ifdef  __cplusplus
  38 extern "C" {
  39 #endif
  40
  41 struct metaslab_class {
  42         metaslab_group_t        *mc_rotor;
  43         uint64_t                mc_allocated;
  44 };
  45
  46 struct metaslab_group {
  47         kmutex_t                mg_lock;
  48         avl_tree_t              mg_metaslab_tree;
  49         uint64_t                mg_aliquot;
  50         int64_t                 mg_bias;
  51         metaslab_class_t        *mg_class;
  52         vdev_t                  *mg_vd;
  53         metaslab_group_t        *mg_prev;
  54         metaslab_group_t        *mg_next;
  55 };
  56
  57 /*
  58  * Each metaslab's free space is tracked in space map object in the MOS,
  59  * which is only updated in syncing context.  Each time we sync a txg,
  60  * we append the allocs and frees from that txg to the space map object.
  61  * When the txg is done syncing, metaslab_sync_done() updates ms_smo
  62  * to ms_smo_syncing.  Everything in ms_smo is always safe to allocate.
  63  */
  64 struct metaslab {
  65         kmutex_t        ms_lock;        /* metaslab lock                */
  66         space_map_obj_t ms_smo;         /* synced space map object      */
  67         space_map_obj_t ms_smo_syncing; /* syncing space map object     */
  68         space_map_t     ms_allocmap[TXG_SIZE];  /* allocated this txg   */
  69         space_map_t     ms_freemap[TXG_SIZE];   /* freed this txg       */
  70         space_map_t     ms_map;         /* in-core free space map       */
  71         uint64_t        ms_weight;      /* weight vs. others in group   */
  72         metaslab_group_t *ms_group;     /* metaslab group               */
  73         avl_node_t      ms_group_node;  /* node in metaslab group tree  */
  74         txg_node_t      ms_txg_node;    /* per-txg dirty metaslab links */
  75 };
  76
  77 #ifdef  __cplusplus
  78 }
  79 #endif
  80
  81 #endif  /* _SYS_METASLAB_IMPL_H */