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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 2010 Sun Microsystems, Inc. All rights reserved. | |
23 | * Use is subject to license terms. | |
24 | */ | |
25 | ||
26 | #ifndef _SYS_DMU_IMPL_H | |
27 | #define _SYS_DMU_IMPL_H | |
28 | ||
29 | #include <sys/txg_impl.h> | |
30 | #include <sys/zio.h> | |
31 | #include <sys/dnode.h> | |
32 | #include <sys/zfs_context.h> | |
33 | ||
34 | #ifdef __cplusplus | |
35 | extern "C" { | |
36 | #endif | |
37 | ||
38 | /* | |
39 | * This is the locking strategy for the DMU. Numbers in parenthesis are | |
40 | * cases that use that lock order, referenced below: | |
41 | * | |
42 | * ARC is self-contained | |
43 | * bplist is self-contained | |
44 | * refcount is self-contained | |
45 | * txg is self-contained (hopefully!) | |
46 | * zst_lock | |
47 | * zf_rwlock | |
48 | * | |
49 | * XXX try to improve evicting path? | |
50 | * | |
51 | * dp_config_rwlock > os_obj_lock > dn_struct_rwlock > | |
52 | * dn_dbufs_mtx > hash_mutexes > db_mtx > dd_lock > leafs | |
53 | * | |
54 | * dp_config_rwlock | |
55 | * must be held before: everything | |
56 | * protects dd namespace changes | |
57 | * protects property changes globally | |
58 | * held from: | |
59 | * dsl_dir_open/r: | |
60 | * dsl_dir_create_sync/w: | |
61 | * dsl_dir_sync_destroy/w: | |
62 | * dsl_dir_rename_sync/w: | |
63 | * dsl_prop_changed_notify/r: | |
64 | * | |
65 | * os_obj_lock | |
66 | * must be held before: | |
67 | * everything except dp_config_rwlock | |
68 | * protects os_obj_next | |
69 | * held from: | |
70 | * dmu_object_alloc: dn_dbufs_mtx, db_mtx, hash_mutexes, dn_struct_rwlock | |
71 | * | |
72 | * 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 | |
77 | * dn_maxblkid | |
78 | * dn_nlevels | |
79 | * dn_*blksz* | |
80 | * phys nlevels, maxblkid, physical blkptr_t's (?) | |
81 | * held from: | |
82 | * callers of dbuf_read_impl, dbuf_hold[_impl], dbuf_prefetch | |
83 | * dmu_object_info_from_dnode: dn_dirty_mtx (dn_datablksz) | |
84 | * dmu_tx_count_free: | |
85 | * dbuf_read_impl: db_mtx, dmu_zfetch() | |
86 | * dmu_zfetch: zf_rwlock/r, zst_lock, dbuf_prefetch() | |
87 | * dbuf_new_size: db_mtx | |
88 | * dbuf_dirty: 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) | |
98 | * | |
99 | * dn_dbufs_mtx | |
100 | * must be held before: | |
101 | * db_mtx, hash_mutexes | |
102 | * protects: | |
103 | * dn_dbufs | |
104 | * dn_evicted | |
105 | * held from: | |
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) | |
112 | * | |
113 | * hash_mutexes (global) | |
114 | * must be held before: | |
115 | * db_mtx | |
116 | * protects dbuf_hash_table (global) and db_hash_next | |
117 | * held from: | |
118 | * dbuf_find: db_mtx | |
119 | * dbuf_hash_insert: db_mtx | |
120 | * dbuf_hash_remove: db_mtx | |
121 | * | |
122 | * db_mtx (meta-leaf) | |
123 | * must be held before: | |
124 | * dn_mtx, dn_dirty_mtx, dd_lock (leaf mutexes) | |
125 | * protects: | |
126 | * db_state | |
127 | * db_holds | |
128 | * db_buf | |
129 | * db_changed | |
130 | * db_data_pending | |
131 | * db_dirtied | |
132 | * db_link | |
133 | * db_dirty_node (??) | |
134 | * db_dirtycnt | |
135 | * db_d.* | |
136 | * db.* | |
137 | * held from: | |
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) | |
143 | * dbuf_* | |
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) | |
151 | * | |
152 | * dn_mtx (leaf) | |
153 | * protects: | |
154 | * dn_dirty_dbufs | |
155 | * dn_ranges | |
156 | * phys accounting | |
157 | * dn_allocated_txg | |
158 | * dn_free_txg | |
159 | * dn_assigned_txg | |
160 | * dd_assigned_tx | |
161 | * dn_notxholds | |
162 | * dn_dirtyctx | |
163 | * dn_dirtyctx_firstset | |
164 | * (dn_phys copy fields?) | |
165 | * (dn_phys contents?) | |
166 | * held from: | |
167 | * dnode_* | |
168 | * dbuf_dirty: none | |
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 | |
177 | * | |
178 | * dd_lock | |
179 | * must be held before: | |
180 | * ds_lock | |
181 | * ancestors' dd_lock | |
182 | * protects: | |
183 | * dd_prop_cbs | |
184 | * dd_sync_* | |
185 | * dd_used_bytes | |
186 | * dd_tempreserved | |
187 | * dd_space_towrite | |
188 | * dd_myname | |
189 | * dd_phys accounting? | |
190 | * held from: | |
191 | * dsl_dir_* | |
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_*) | |
196 | * | |
197 | * os_lock (leaf) | |
198 | * protects: | |
199 | * os_dirty_dnodes | |
200 | * os_free_dnodes | |
201 | * os_dnodes | |
202 | * os_downgraded_dbufs | |
203 | * dn_dirtyblksz | |
204 | * dn_dirty_link | |
205 | * held from: | |
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) | |
210 | * | |
211 | * ds_lock | |
212 | * protects: | |
213 | * ds_objset | |
214 | * ds_open_refcount | |
215 | * ds_snapname | |
216 | * ds_phys accounting | |
217 | * ds_phys userrefs zapobj | |
218 | * ds_reserved | |
219 | * held from: | |
220 | * dsl_dataset_* | |
221 | * | |
222 | * dr_mtx (leaf) | |
223 | * protects: | |
224 | * dr_children | |
225 | * held from: | |
226 | * dbuf_dirty | |
227 | * dbuf_undirty | |
228 | * dbuf_sync_indirect | |
229 | * dnode_new_blkid | |
230 | */ | |
231 | ||
232 | struct objset; | |
233 | struct dmu_pool; | |
234 | ||
235 | typedef struct dmu_xuio { | |
236 | int next; | |
237 | int cnt; | |
238 | struct arc_buf **bufs; | |
239 | iovec_t *iovp; | |
240 | } dmu_xuio_t; | |
241 | ||
242 | #ifdef __cplusplus | |
243 | } | |
244 | #endif | |
245 | ||
246 | #endif /* _SYS_DMU_IMPL_H */ |