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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.
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.
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]
22 * Copyright 2010 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
26 #ifndef _SYS_DMU_IMPL_H
27 #define _SYS_DMU_IMPL_H
29 #include <sys/txg_impl.h>
31 #include <sys/dnode.h>
32 #include <sys/zfs_context.h>
39 * This is the locking strategy for the DMU. Numbers in parenthesis are
40 * cases that use that lock order, referenced below:
42 * ARC is self-contained
43 * bplist is self-contained
44 * refcount is self-contained
45 * txg is self-contained (hopefully!)
49 * XXX try to improve evicting path?
51 * dp_config_rwlock > os_obj_lock > dn_struct_rwlock >
52 * dn_dbufs_mtx > hash_mutexes > db_mtx > dd_lock > leafs
55 * must be held before: everything
56 * protects dd namespace changes
57 * protects property changes globally
60 * dsl_dir_create_sync/w:
61 * dsl_dir_sync_destroy/w:
62 * dsl_dir_rename_sync/w:
63 * dsl_prop_changed_notify/r:
66 * must be held before:
67 * everything except dp_config_rwlock
68 * protects os_obj_next
70 * dmu_object_alloc: dn_dbufs_mtx, db_mtx, hash_mutexes, dn_struct_rwlock
73 * must be held before:
74 * everything except dp_config_rwlock and os_obj_lock
75 * protects structure of dnode (eg. nlevels)
76 * db_blkptr can change when syncing out change to nlevels
80 * phys nlevels, maxblkid, physical blkptr_t's (?)
82 * callers of dbuf_read_impl, dbuf_hold[_impl], dbuf_prefetch
83 * dmu_object_info_from_dnode: dn_dirty_mtx (dn_datablksz)
85 * dbuf_read_impl: db_mtx, dmu_zfetch()
86 * dmu_zfetch: zf_rwlock/r, zst_lock, dbuf_prefetch()
87 * dbuf_new_size: db_mtx
89 * dbuf_findbp: (callers, phys? - the real need)
90 * dbuf_create: dn_dbufs_mtx, hash_mutexes, db_mtx (phys?)
91 * dbuf_prefetch: dn_dirty_mtx, hash_mutexes, db_mtx, dn_dbufs_mtx
92 * dbuf_hold_impl: hash_mutexes, db_mtx, dn_dbufs_mtx, dbuf_findbp()
93 * dnode_sync/w (increase_indirection): db_mtx (phys)
94 * dnode_set_blksz/w: dn_dbufs_mtx (dn_*blksz*)
95 * dnode_new_blkid/w: (dn_maxblkid)
96 * dnode_free_range/w: dn_dirty_mtx (dn_maxblkid)
97 * dnode_next_offset: (phys)
100 * must be held before:
101 * db_mtx, hash_mutexes
106 * dmu_evict_user: db_mtx (dn_dbufs)
107 * dbuf_free_range: db_mtx (dn_dbufs)
108 * dbuf_remove_ref: db_mtx, callees:
109 * dbuf_hash_remove: hash_mutexes, db_mtx
110 * dbuf_create: hash_mutexes, db_mtx (dn_dbufs)
111 * dnode_set_blksz: (dn_dbufs)
113 * hash_mutexes (global)
114 * must be held before:
116 * protects dbuf_hash_table (global) and db_hash_next
119 * dbuf_hash_insert: db_mtx
120 * dbuf_hash_remove: db_mtx
123 * must be held before:
124 * dn_mtx, dn_dirty_mtx, dd_lock (leaf mutexes)
138 * dbuf_dirty: dn_mtx, dn_dirty_mtx
139 * dbuf_dirty->dsl_dir_willuse_space: dd_lock
140 * dbuf_dirty->dbuf_new_block->dsl_dataset_block_freeable: dd_lock
141 * dbuf_undirty: dn_dirty_mtx (db_d)
142 * dbuf_write_done: dn_dirty_mtx (db_state)
144 * dmu_buf_update_user: none (db_d)
145 * dmu_evict_user: none (db_d) (maybe can eliminate)
146 * dbuf_find: none (db_holds)
147 * dbuf_hash_insert: none (db_holds)
148 * dmu_buf_read_array_impl: none (db_state, db_changed)
149 * dmu_sync: none (db_dirty_node, db_d)
150 * dnode_reallocate: none (db)
163 * dn_dirtyctx_firstset
164 * (dn_phys copy fields?)
165 * (dn_phys contents?)
169 * dbuf_sync: none (phys accounting)
170 * dbuf_undirty: none (dn_ranges, dn_dirty_dbufs)
171 * dbuf_write_done: none (phys accounting)
172 * dmu_object_info_from_dnode: none (accounting)
173 * dmu_tx_commit: none
174 * dmu_tx_hold_object_impl: none
175 * dmu_tx_try_assign: dn_notxholds(cv)
176 * dmu_tx_unassign: none
179 * must be held before:
189 * dd_phys accounting?
192 * dsl_prop_changed_notify: none (dd_prop_cbs)
193 * dsl_prop_register: none (dd_prop_cbs)
194 * dsl_prop_unregister: none (dd_prop_cbs)
195 * dsl_dataset_block_freeable: none (dd_sync_*)
202 * os_downgraded_dbufs
206 * dnode_create: none (os_dnodes)
207 * dnode_destroy: none (os_dnodes)
208 * dnode_setdirty: none (dn_dirtyblksz, os_*_dnodes)
209 * dnode_free: none (dn_dirtyblksz, os_*_dnodes)
217 * ds_phys userrefs zapobj
235 typedef struct dmu_xuio
{
238 struct arc_buf
**bufs
;
246 #endif /* _SYS_DMU_IMPL_H */