dmu_objset.h revision 308083 
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, 2015 by Delphix. All rights reserved.
24 * Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
25 * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
26 * Copyright (c) 2014 Integros [integros.com]
27 */
28
29/* Portions Copyright 2010 Robert Milkowski */
30
31#ifndef	_SYS_DMU_OBJSET_H
32#define	_SYS_DMU_OBJSET_H
33
34#include <sys/spa.h>
35#include <sys/arc.h>
36#include <sys/txg.h>
37#include <sys/zfs_context.h>
38#include <sys/dnode.h>
39#include <sys/zio.h>
40#include <sys/zil.h>
41#include <sys/sa.h>
42
43#ifdef	__cplusplus
44extern "C" {
45#endif
46
47extern krwlock_t os_lock;
48
49struct dsl_pool;
50struct dsl_dataset;
51struct dmu_tx;
52
53#define	OBJSET_PHYS_SIZE 2048
54#define	OBJSET_OLD_PHYS_SIZE 1024
55
56#define	OBJSET_BUF_HAS_USERUSED(buf) \
57	(arc_buf_size(buf) > OBJSET_OLD_PHYS_SIZE)
58
59#define	OBJSET_FLAG_USERACCOUNTING_COMPLETE	(1ULL<<0)
60
61typedef struct objset_phys {
62	dnode_phys_t os_meta_dnode;
63	zil_header_t os_zil_header;
64	uint64_t os_type;
65	uint64_t os_flags;
66	char os_pad[OBJSET_PHYS_SIZE - sizeof (dnode_phys_t)*3 -
67	    sizeof (zil_header_t) - sizeof (uint64_t)*2];
68	dnode_phys_t os_userused_dnode;
69	dnode_phys_t os_groupused_dnode;
70} objset_phys_t;
71
72struct objset {
73	/* Immutable: */
74	struct dsl_dataset *os_dsl_dataset;
75	spa_t *os_spa;
76	arc_buf_t *os_phys_buf;
77	objset_phys_t *os_phys;
78	/*
79	 * The following "special" dnodes have no parent, are exempt
80	 * from dnode_move(), and are not recorded in os_dnodes, but they
81	 * root their descendents in this objset using handles anyway, so
82	 * that all access to dnodes from dbufs consistently uses handles.
83	 */
84	dnode_handle_t os_meta_dnode;
85	dnode_handle_t os_userused_dnode;
86	dnode_handle_t os_groupused_dnode;
87	zilog_t *os_zil;
88
89	list_node_t os_evicting_node;
90
91	/* can change, under dsl_dir's locks: */
92	enum zio_checksum os_checksum;
93	enum zio_compress os_compress;
94	uint8_t os_copies;
95	enum zio_checksum os_dedup_checksum;
96	boolean_t os_dedup_verify;
97	zfs_logbias_op_t os_logbias;
98	zfs_cache_type_t os_primary_cache;
99	zfs_cache_type_t os_secondary_cache;
100	zfs_sync_type_t os_sync;
101	zfs_redundant_metadata_type_t os_redundant_metadata;
102	int os_recordsize;
103
104	/*
105	 * Pointer is constant; the blkptr it points to is protected by
106	 * os_dsl_dataset->ds_bp_rwlock
107	 */
108	blkptr_t *os_rootbp;
109
110	/* no lock needed: */
111	struct dmu_tx *os_synctx; /* XXX sketchy */
112	zil_header_t os_zil_header;
113	list_t os_synced_dnodes;
114	uint64_t os_flags;
115
116	/* Protected by os_obj_lock */
117	kmutex_t os_obj_lock;
118	uint64_t os_obj_next;
119
120	/* Protected by os_lock */
121	kmutex_t os_lock;
122	list_t os_dirty_dnodes[TXG_SIZE];
123	list_t os_free_dnodes[TXG_SIZE];
124	list_t os_dnodes;
125	list_t os_downgraded_dbufs;
126
127	/* stuff we store for the user */
128	kmutex_t os_user_ptr_lock;
129	void *os_user_ptr;
130	sa_os_t *os_sa;
131};
132
133#define	DMU_META_OBJSET		0
134#define	DMU_META_DNODE_OBJECT	0
135#define	DMU_OBJECT_IS_SPECIAL(obj) ((int64_t)(obj) <= 0)
136#define	DMU_META_DNODE(os)	((os)->os_meta_dnode.dnh_dnode)
137#define	DMU_USERUSED_DNODE(os)	((os)->os_userused_dnode.dnh_dnode)
138#define	DMU_GROUPUSED_DNODE(os)	((os)->os_groupused_dnode.dnh_dnode)
139
140#define	DMU_OS_IS_L2CACHEABLE(os)				\
141	((os)->os_secondary_cache == ZFS_CACHE_ALL ||		\
142	(os)->os_secondary_cache == ZFS_CACHE_METADATA)
143
144#define	DMU_OS_IS_L2COMPRESSIBLE(os)	(zfs_mdcomp_disable == B_FALSE)
145
146/* called from zpl */
147int dmu_objset_hold(const char *name, void *tag, objset_t **osp);
148int dmu_objset_own(const char *name, dmu_objset_type_t type,
149    boolean_t readonly, void *tag, objset_t **osp);
150int dmu_objset_own_obj(struct dsl_pool *dp, uint64_t obj,
151    dmu_objset_type_t type, boolean_t readonly, void *tag, objset_t **osp);
152void dmu_objset_refresh_ownership(objset_t *os, void *tag);
153void dmu_objset_rele(objset_t *os, void *tag);
154void dmu_objset_disown(objset_t *os, void *tag);
155int dmu_objset_from_ds(struct dsl_dataset *ds, objset_t **osp);
156
157void dmu_objset_stats(objset_t *os, nvlist_t *nv);
158void dmu_objset_fast_stat(objset_t *os, dmu_objset_stats_t *stat);
159void dmu_objset_space(objset_t *os, uint64_t *refdbytesp, uint64_t *availbytesp,
160    uint64_t *usedobjsp, uint64_t *availobjsp);
161uint64_t dmu_objset_fsid_guid(objset_t *os);
162int dmu_objset_find_dp(struct dsl_pool *dp, uint64_t ddobj,
163    int func(struct dsl_pool *, struct dsl_dataset *, void *),
164    void *arg, int flags);
165int dmu_objset_prefetch(const char *name, void *arg);
166void dmu_objset_evict_dbufs(objset_t *os);
167timestruc_t dmu_objset_snap_cmtime(objset_t *os);
168
169/* called from dsl */
170void dmu_objset_sync(objset_t *os, zio_t *zio, dmu_tx_t *tx);
171boolean_t dmu_objset_is_dirty(objset_t *os, uint64_t txg);
172objset_t *dmu_objset_create_impl(spa_t *spa, struct dsl_dataset *ds,
173    blkptr_t *bp, dmu_objset_type_t type, dmu_tx_t *tx);
174int dmu_objset_open_impl(spa_t *spa, struct dsl_dataset *ds, blkptr_t *bp,
175    objset_t **osp);
176void dmu_objset_evict(objset_t *os);
177void dmu_objset_do_userquota_updates(objset_t *os, dmu_tx_t *tx);
178void dmu_objset_userquota_get_ids(dnode_t *dn, boolean_t before, dmu_tx_t *tx);
179boolean_t dmu_objset_userused_enabled(objset_t *os);
180int dmu_objset_userspace_upgrade(objset_t *os);
181boolean_t dmu_objset_userspace_present(objset_t *os);
182int dmu_fsname(const char *snapname, char *buf);
183
184void dmu_objset_evict_done(objset_t *os);
185
186void dmu_objset_init(void);
187void dmu_objset_fini(void);
188
189#ifdef	__cplusplus
190}
191#endif
192
193#endif /* _SYS_DMU_OBJSET_H */
194