xref: /titanic_51/usr/src/uts/common/fs/zfs/sys/metaslab.h (revision db9ce1c953f094d292df951aada6b8a85e1ff103)
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 2009 Sun Microsystems, Inc.  All rights reserved.
23  * Use is subject to license terms.
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 
47 #define	METASLAB_HINTBP_FAVOR	0x0
48 #define	METASLAB_HINTBP_AVOID	0x1
49 #define	METASLAB_GANG_HEADER	0x2
50 
51 extern int metaslab_alloc(spa_t *spa, metaslab_class_t *mc, uint64_t psize,
52     blkptr_t *bp, int ncopies, uint64_t txg, blkptr_t *hintbp, int flags);
53 extern void metaslab_free(spa_t *spa, const blkptr_t *bp, uint64_t txg,
54     boolean_t now);
55 extern int metaslab_claim(spa_t *spa, const blkptr_t *bp, uint64_t txg);
56 
57 extern metaslab_class_t *metaslab_class_create(spa_t *spa,
58     space_map_ops_t *ops);
59 extern void metaslab_class_destroy(metaslab_class_t *mc);
60 extern int metaslab_class_validate(metaslab_class_t *mc);
61 
62 extern void metaslab_class_space_update(metaslab_class_t *mc,
63     int64_t alloc_delta, int64_t defer_delta,
64     int64_t space_delta, int64_t dspace_delta);
65 extern uint64_t metaslab_class_get_alloc(metaslab_class_t *mc);
66 extern uint64_t metaslab_class_get_space(metaslab_class_t *mc);
67 extern uint64_t metaslab_class_get_dspace(metaslab_class_t *mc);
68 extern uint64_t metaslab_class_get_deferred(metaslab_class_t *mc);
69 
70 extern metaslab_group_t *metaslab_group_create(metaslab_class_t *mc,
71     vdev_t *vd);
72 extern void metaslab_group_destroy(metaslab_group_t *mg);
73 extern void metaslab_group_activate(metaslab_group_t *mg);
74 extern void metaslab_group_passivate(metaslab_group_t *mg);
75 
76 #ifdef	__cplusplus
77 }
78 #endif
79 
80 #endif	/* _SYS_METASLAB_H */
81