zfs/include/sys/metaslab.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 (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
  23  * Copyright (c) 2011, 2014 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 } metaslab_ops_t;
  42
  43 extern metaslab_ops_t *zfs_metaslab_ops;
  44
  45 int metaslab_init(metaslab_group_t *, uint64_t, uint64_t, uint64_t,
  46     metaslab_t **);
  47 void metaslab_fini(metaslab_t *);
  48
  49 void metaslab_load_wait(metaslab_t *);
  50 int metaslab_load(metaslab_t *);
  51 void metaslab_unload(metaslab_t *);
  52
  53 void metaslab_sync(metaslab_t *, uint64_t);
  54 void metaslab_sync_done(metaslab_t *, uint64_t);
  55 void metaslab_sync_reassess(metaslab_group_t *);
  56 uint64_t metaslab_block_maxsize(metaslab_t *);
  57
  58 #define METASLAB_HINTBP_FAVOR   0x0
  59 #define METASLAB_HINTBP_AVOID   0x1
  60 #define METASLAB_GANG_HEADER    0x2
  61 #define METASLAB_GANG_CHILD     0x4
  62 #define METASLAB_GANG_AVOID     0x8
  63 #define METASLAB_FASTWRITE      0x10
  64
  65 int metaslab_alloc(spa_t *, metaslab_class_t *, uint64_t,
  66     blkptr_t *, int, uint64_t, blkptr_t *, int);
  67 void metaslab_free(spa_t *, const blkptr_t *, uint64_t, boolean_t);
  68 int metaslab_claim(spa_t *, const blkptr_t *, uint64_t);
  69 void metaslab_check_free(spa_t *, const blkptr_t *);
  70 void metaslab_fastwrite_mark(spa_t *, const blkptr_t *);
  71 void metaslab_fastwrite_unmark(spa_t *, const blkptr_t *);
  72
  73 metaslab_class_t *metaslab_class_create(spa_t *, metaslab_ops_t *);
  74 void metaslab_class_destroy(metaslab_class_t *);
  75 int metaslab_class_validate(metaslab_class_t *);
  76 void metaslab_class_histogram_verify(metaslab_class_t *);
  77 uint64_t metaslab_class_fragmentation(metaslab_class_t *);
  78 uint64_t metaslab_class_expandable_space(metaslab_class_t *);
  79
  80 void metaslab_class_space_update(metaslab_class_t *, int64_t, int64_t,
  81     int64_t, int64_t);
  82 uint64_t metaslab_class_get_alloc(metaslab_class_t *);
  83 uint64_t metaslab_class_get_space(metaslab_class_t *);
  84 uint64_t metaslab_class_get_dspace(metaslab_class_t *);
  85 uint64_t metaslab_class_get_deferred(metaslab_class_t *);
  86
  87 metaslab_group_t *metaslab_group_create(metaslab_class_t *, vdev_t *);
  88 void metaslab_group_destroy(metaslab_group_t *);
  89 void metaslab_group_activate(metaslab_group_t *);
  90 void metaslab_group_passivate(metaslab_group_t *);
  91 uint64_t metaslab_group_get_space(metaslab_group_t *);
  92 void metaslab_group_histogram_verify(metaslab_group_t *);
  93 uint64_t metaslab_group_fragmentation(metaslab_group_t *);
  94 void metaslab_group_histogram_remove(metaslab_group_t *, metaslab_t *);
  95
  96 #ifdef  __cplusplus
  97 }
  98 #endif
  99
 100 #endif  /* _SYS_METASLAB_H */