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      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, 2016 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 
     40 typedef struct metaslab_ops {
     41 	uint64_t (*msop_alloc)(metaslab_t *, uint64_t);
     42 } metaslab_ops_t;
     43 
     44 
     45 extern metaslab_ops_t *zfs_metaslab_ops;
     46 
     47 int metaslab_init(metaslab_group_t *, uint64_t, uint64_t, uint64_t,
     48     metaslab_t **);
     49 void metaslab_fini(metaslab_t *);
     50 
     51 void metaslab_load_wait(metaslab_t *);
     52 int metaslab_load(metaslab_t *);
     53 void metaslab_unload(metaslab_t *);
     54 
     55 void metaslab_sync(metaslab_t *, uint64_t);
     56 void metaslab_sync_done(metaslab_t *, uint64_t);
     57 void metaslab_sync_reassess(metaslab_group_t *);
     58 uint64_t metaslab_block_maxsize(metaslab_t *);
     59 
     60 #define	METASLAB_HINTBP_FAVOR		0x0
     61 #define	METASLAB_HINTBP_AVOID		0x1
     62 #define	METASLAB_GANG_HEADER		0x2
     63 #define	METASLAB_GANG_CHILD		0x4
     64 #define	METASLAB_ASYNC_ALLOC		0x8
     65 #define	METASLAB_DONT_THROTTLE		0x10
     66 
     67 int metaslab_alloc(spa_t *, metaslab_class_t *, uint64_t,
     68     blkptr_t *, int, uint64_t, blkptr_t *, int, zio_alloc_list_t *, zio_t *);
     69 void metaslab_free(spa_t *, const blkptr_t *, uint64_t, boolean_t);
     70 int metaslab_claim(spa_t *, const blkptr_t *, uint64_t);
     71 void metaslab_check_free(spa_t *, const blkptr_t *);
     72 
     73 void metaslab_alloc_trace_init(void);
     74 void metaslab_alloc_trace_fini(void);
     75 void metaslab_trace_init(zio_alloc_list_t *);
     76 void metaslab_trace_fini(zio_alloc_list_t *);
     77 
     78 metaslab_class_t *metaslab_class_create(spa_t *, metaslab_ops_t *);
     79 void metaslab_class_destroy(metaslab_class_t *);
     80 int metaslab_class_validate(metaslab_class_t *);
     81 void metaslab_class_histogram_verify(metaslab_class_t *);
     82 uint64_t metaslab_class_fragmentation(metaslab_class_t *);
     83 uint64_t metaslab_class_expandable_space(metaslab_class_t *);
     84 boolean_t metaslab_class_throttle_reserve(metaslab_class_t *, int,
     85     zio_t *, int);
     86 void metaslab_class_throttle_unreserve(metaslab_class_t *, int, zio_t *);
     87 
     88 void metaslab_class_space_update(metaslab_class_t *, int64_t, int64_t,
     89     int64_t, int64_t);
     90 uint64_t metaslab_class_get_alloc(metaslab_class_t *);
     91 uint64_t metaslab_class_get_space(metaslab_class_t *);
     92 uint64_t metaslab_class_get_dspace(metaslab_class_t *);
     93 uint64_t metaslab_class_get_deferred(metaslab_class_t *);
     94 uint64_t metaslab_class_get_minblocksize(metaslab_class_t *mc);
     95 
     96 metaslab_group_t *metaslab_group_create(metaslab_class_t *, vdev_t *);
     97 void metaslab_group_destroy(metaslab_group_t *);
     98 void metaslab_group_activate(metaslab_group_t *);
     99 void metaslab_group_passivate(metaslab_group_t *);
    100 boolean_t metaslab_group_initialized(metaslab_group_t *);
    101 uint64_t metaslab_group_get_space(metaslab_group_t *);
    102 void metaslab_group_histogram_verify(metaslab_group_t *);
    103 uint64_t metaslab_group_fragmentation(metaslab_group_t *);
    104 void metaslab_group_histogram_remove(metaslab_group_t *, metaslab_t *);
    105 void metaslab_group_alloc_decrement(spa_t *, uint64_t, void *, int);
    106 void metaslab_group_alloc_verify(spa_t *, const blkptr_t *, void *);
    107 
    108 #ifdef	__cplusplus
    109 }
    110 #endif
    111 
    112 #endif	/* _SYS_METASLAB_H */
    113