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 (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
  23  * Copyright (c) 2013 by Delphix. All rights reserved.
  24  */
  25 
  26 #ifndef _SYS_METASLAB_H
  27 #define _SYS_METASLAB_H
  28 
  29 #include <sys/spa.h>
  30 #include <sys/space_map.h>
  31 #include <sys/txg.h>
  32 #include <sys/zio.h>
  33 #include <sys/avl.h>
  34 
  35 #ifdef  __cplusplus
  36 extern "C" {
  37 #endif
  38 
  39 typedef struct metaslab_ops {
  40         uint64_t (*msop_alloc)(metaslab_t *msp, uint64_t size);
  41         boolean_t (*msop_fragmented)(metaslab_t *msp);
  42 } metaslab_ops_t;
  43 
  44 extern metaslab_ops_t *zfs_metaslab_ops;
  45 
  46 metaslab_t *metaslab_init(metaslab_group_t *mg, uint64_t id,
  47     uint64_t object, uint64_t txg);
  48 void metaslab_fini(metaslab_t *msp);
  49 
  50 void metaslab_load_wait(metaslab_t *msp);
  51 int metaslab_load(metaslab_t *msp);
  52 void metaslab_unload(metaslab_t *msp);
  53 
  54 void metaslab_sync(metaslab_t *msp, uint64_t txg);
  55 void metaslab_sync_done(metaslab_t *msp, uint64_t txg);
  56 void metaslab_sync_reassess(metaslab_group_t *mg);
  57 uint64_t metaslab_block_maxsize(metaslab_t *msp);
  58 
  59 #define METASLAB_HINTBP_FAVOR   0x0
  60 #define METASLAB_HINTBP_AVOID   0x1
  61 #define METASLAB_GANG_HEADER    0x2
  62 #define METASLAB_GANG_CHILD     0x4
  63 #define METASLAB_GANG_AVOID     0x8
  64 
  65 int metaslab_alloc(spa_t *spa, metaslab_class_t *mc, uint64_t psize,
  66     blkptr_t *bp, int ncopies, uint64_t txg, blkptr_t *hintbp, int flags);
  67 void metaslab_free(spa_t *spa, const blkptr_t *bp, uint64_t txg, boolean_t now);
  68 int metaslab_claim(spa_t *spa, const blkptr_t *bp, uint64_t txg);
  69 void metaslab_check_free(spa_t *spa, const blkptr_t *bp);
  70 
  71 metaslab_class_t *metaslab_class_create(spa_t *spa, metaslab_ops_t *ops);
  72 void metaslab_class_destroy(metaslab_class_t *mc);
  73 int metaslab_class_validate(metaslab_class_t *mc);
  74 
  75 void metaslab_class_space_update(metaslab_class_t *mc,
  76     int64_t alloc_delta, int64_t defer_delta,
  77     int64_t space_delta, int64_t dspace_delta);
  78 uint64_t metaslab_class_get_alloc(metaslab_class_t *mc);
  79 uint64_t metaslab_class_get_space(metaslab_class_t *mc);
  80 uint64_t metaslab_class_get_dspace(metaslab_class_t *mc);
  81 uint64_t metaslab_class_get_deferred(metaslab_class_t *mc);
  82 
  83 metaslab_group_t *metaslab_group_create(metaslab_class_t *mc, vdev_t *vd);
  84 void metaslab_group_destroy(metaslab_group_t *mg);
  85 void metaslab_group_activate(metaslab_group_t *mg);
  86 void metaslab_group_passivate(metaslab_group_t *mg);
  87 
  88 #ifdef  __cplusplus
  89 }
  90 #endif
  91 
  92 #endif  /* _SYS_METASLAB_H */