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) 2012 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 extern space_map_ops_t *zfs_metaslab_ops;
  40 
  41 extern metaslab_t *metaslab_init(metaslab_group_t *mg, space_map_obj_t *smo,
  42     uint64_t start, uint64_t size, uint64_t txg);
  43 extern void metaslab_fini(metaslab_t *msp);
  44 extern void metaslab_sync(metaslab_t *msp, uint64_t txg);
  45 extern void metaslab_sync_done(metaslab_t *msp, uint64_t txg);
  46 extern void metaslab_sync_reassess(metaslab_group_t *mg);
  47 
  48 #define METASLAB_HINTBP_FAVOR   0x0
  49 #define METASLAB_HINTBP_AVOID   0x1
  50 #define METASLAB_GANG_HEADER    0x2
  51 #define METASLAB_GANG_CHILD     0x4
  52 #define METASLAB_GANG_AVOID     0x8
  53 
  54 extern int metaslab_alloc(spa_t *spa, metaslab_class_t *mc, uint64_t psize,
  55     blkptr_t *bp, int ncopies, uint64_t txg, blkptr_t *hintbp, int flags);
  56 extern void metaslab_free(spa_t *spa, const blkptr_t *bp, uint64_t txg,
  57     boolean_t now);
  58 extern int metaslab_claim(spa_t *spa, const blkptr_t *bp, uint64_t txg);
  59 extern void metaslab_check_free(spa_t *spa, const blkptr_t *bp);
  60 
  61 extern metaslab_class_t *metaslab_class_create(spa_t *spa,
  62     space_map_ops_t *ops);
  63 extern void metaslab_class_destroy(metaslab_class_t *mc);
  64 extern int metaslab_class_validate(metaslab_class_t *mc);
  65 
  66 extern void metaslab_class_space_update(metaslab_class_t *mc,
  67     int64_t alloc_delta, int64_t defer_delta,
  68     int64_t space_delta, int64_t dspace_delta);
  69 extern uint64_t metaslab_class_get_alloc(metaslab_class_t *mc);
  70 extern uint64_t metaslab_class_get_space(metaslab_class_t *mc);
  71 extern uint64_t metaslab_class_get_dspace(metaslab_class_t *mc);
  72 extern uint64_t metaslab_class_get_deferred(metaslab_class_t *mc);
  73 
  74 extern metaslab_group_t *metaslab_group_create(metaslab_class_t *mc,
  75     vdev_t *vd);
  76 extern void metaslab_group_destroy(metaslab_group_t *mg);
  77 extern void metaslab_group_activate(metaslab_group_t *mg);
  78 extern void metaslab_group_passivate(metaslab_group_t *mg);
  79 
  80 #ifdef  __cplusplus
  81 }
  82 #endif
  83 
  84 #endif  /* _SYS_METASLAB_H */