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--- old/usr/src/uts/common/fs/zfs/sys/dmu_impl.h
+++ new/usr/src/uts/common/fs/zfs/sys/dmu_impl.h
1 1 /*
2 2 * CDDL HEADER START
3 3 *
4 4 * The contents of this file are subject to the terms of the
5 5 * Common Development and Distribution License (the "License").
6 6 * You may not use this file except in compliance with the License.
7 7 *
8 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 9 * or http://www.opensolaris.org/os/licensing.
10 10 * See the License for the specific language governing permissions
11 11 * and limitations under the License.
12 12 *
13 13 * When distributing Covered Code, include this CDDL HEADER in each
14 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 15 * If applicable, add the following below this CDDL HEADER, with the
16 16 * fields enclosed by brackets "[]" replaced with your own identifying
17 17 * information: Portions Copyright [yyyy] [name of copyright owner]
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18 18 *
19 19 * CDDL HEADER END
20 20 */
21 21 /*
22 22 * Copyright 2010 Sun Microsystems, Inc. All rights reserved.
23 23 * Use is subject to license terms.
24 24 */
25 25 /*
26 26 * Copyright (c) 2012, Joyent, Inc. All rights reserved.
27 27 * Copyright (c) 2013, 2015 by Delphix. All rights reserved.
28 + * Copyright 2015 RackTop Systems.
28 29 */
29 30
30 31 #ifndef _SYS_DMU_IMPL_H
31 32 #define _SYS_DMU_IMPL_H
32 33
33 34 #include <sys/txg_impl.h>
34 35 #include <sys/zio.h>
35 36 #include <sys/dnode.h>
36 37 #include <sys/zfs_context.h>
37 38 #include <sys/zfs_ioctl.h>
38 39
39 40 #ifdef __cplusplus
40 41 extern "C" {
41 42 #endif
42 43
43 44 /*
44 45 * This is the locking strategy for the DMU. Numbers in parenthesis are
45 46 * cases that use that lock order, referenced below:
46 47 *
47 48 * ARC is self-contained
48 49 * bplist is self-contained
49 50 * refcount is self-contained
50 51 * txg is self-contained (hopefully!)
51 52 * zst_lock
52 53 * zf_rwlock
53 54 *
54 55 * XXX try to improve evicting path?
55 56 *
56 57 * dp_config_rwlock > os_obj_lock > dn_struct_rwlock >
57 58 * dn_dbufs_mtx > hash_mutexes > db_mtx > dd_lock > leafs
58 59 *
59 60 * dp_config_rwlock
60 61 * must be held before: everything
61 62 * protects dd namespace changes
62 63 * protects property changes globally
63 64 * held from:
64 65 * dsl_dir_open/r:
65 66 * dsl_dir_create_sync/w:
66 67 * dsl_dir_sync_destroy/w:
67 68 * dsl_dir_rename_sync/w:
68 69 * dsl_prop_changed_notify/r:
69 70 *
70 71 * os_obj_lock
71 72 * must be held before:
72 73 * everything except dp_config_rwlock
73 74 * protects os_obj_next
74 75 * held from:
75 76 * dmu_object_alloc: dn_dbufs_mtx, db_mtx, hash_mutexes, dn_struct_rwlock
76 77 *
77 78 * dn_struct_rwlock
78 79 * must be held before:
79 80 * everything except dp_config_rwlock and os_obj_lock
80 81 * protects structure of dnode (eg. nlevels)
81 82 * db_blkptr can change when syncing out change to nlevels
82 83 * dn_maxblkid
83 84 * dn_nlevels
84 85 * dn_*blksz*
85 86 * phys nlevels, maxblkid, physical blkptr_t's (?)
86 87 * held from:
87 88 * callers of dbuf_read_impl, dbuf_hold[_impl], dbuf_prefetch
88 89 * dmu_object_info_from_dnode: dn_dirty_mtx (dn_datablksz)
89 90 * dmu_tx_count_free:
90 91 * dbuf_read_impl: db_mtx, dmu_zfetch()
91 92 * dmu_zfetch: zf_rwlock/r, zst_lock, dbuf_prefetch()
92 93 * dbuf_new_size: db_mtx
93 94 * dbuf_dirty: db_mtx
94 95 * dbuf_findbp: (callers, phys? - the real need)
95 96 * dbuf_create: dn_dbufs_mtx, hash_mutexes, db_mtx (phys?)
96 97 * dbuf_prefetch: dn_dirty_mtx, hash_mutexes, db_mtx, dn_dbufs_mtx
97 98 * dbuf_hold_impl: hash_mutexes, db_mtx, dn_dbufs_mtx, dbuf_findbp()
98 99 * dnode_sync/w (increase_indirection): db_mtx (phys)
99 100 * dnode_set_blksz/w: dn_dbufs_mtx (dn_*blksz*)
100 101 * dnode_new_blkid/w: (dn_maxblkid)
101 102 * dnode_free_range/w: dn_dirty_mtx (dn_maxblkid)
102 103 * dnode_next_offset: (phys)
103 104 *
104 105 * dn_dbufs_mtx
105 106 * must be held before:
106 107 * db_mtx, hash_mutexes
107 108 * protects:
108 109 * dn_dbufs
109 110 * dn_evicted
110 111 * held from:
111 112 * dmu_evict_user: db_mtx (dn_dbufs)
112 113 * dbuf_free_range: db_mtx (dn_dbufs)
113 114 * dbuf_remove_ref: db_mtx, callees:
114 115 * dbuf_hash_remove: hash_mutexes, db_mtx
115 116 * dbuf_create: hash_mutexes, db_mtx (dn_dbufs)
116 117 * dnode_set_blksz: (dn_dbufs)
117 118 *
118 119 * hash_mutexes (global)
119 120 * must be held before:
120 121 * db_mtx
121 122 * protects dbuf_hash_table (global) and db_hash_next
122 123 * held from:
123 124 * dbuf_find: db_mtx
124 125 * dbuf_hash_insert: db_mtx
125 126 * dbuf_hash_remove: db_mtx
126 127 *
127 128 * db_mtx (meta-leaf)
128 129 * must be held before:
129 130 * dn_mtx, dn_dirty_mtx, dd_lock (leaf mutexes)
130 131 * protects:
131 132 * db_state
132 133 * db_holds
133 134 * db_buf
134 135 * db_changed
135 136 * db_data_pending
136 137 * db_dirtied
137 138 * db_link
138 139 * db_dirty_node (??)
139 140 * db_dirtycnt
140 141 * db_d.*
141 142 * db.*
142 143 * held from:
143 144 * dbuf_dirty: dn_mtx, dn_dirty_mtx
144 145 * dbuf_dirty->dsl_dir_willuse_space: dd_lock
145 146 * dbuf_dirty->dbuf_new_block->dsl_dataset_block_freeable: dd_lock
146 147 * dbuf_undirty: dn_dirty_mtx (db_d)
147 148 * dbuf_write_done: dn_dirty_mtx (db_state)
148 149 * dbuf_*
149 150 * dmu_buf_update_user: none (db_d)
150 151 * dmu_evict_user: none (db_d) (maybe can eliminate)
151 152 * dbuf_find: none (db_holds)
152 153 * dbuf_hash_insert: none (db_holds)
153 154 * dmu_buf_read_array_impl: none (db_state, db_changed)
154 155 * dmu_sync: none (db_dirty_node, db_d)
155 156 * dnode_reallocate: none (db)
156 157 *
157 158 * dn_mtx (leaf)
158 159 * protects:
159 160 * dn_dirty_dbufs
160 161 * dn_ranges
161 162 * phys accounting
162 163 * dn_allocated_txg
163 164 * dn_free_txg
164 165 * dn_assigned_txg
165 166 * dd_assigned_tx
166 167 * dn_notxholds
167 168 * dn_dirtyctx
168 169 * dn_dirtyctx_firstset
169 170 * (dn_phys copy fields?)
170 171 * (dn_phys contents?)
171 172 * held from:
172 173 * dnode_*
173 174 * dbuf_dirty: none
174 175 * dbuf_sync: none (phys accounting)
175 176 * dbuf_undirty: none (dn_ranges, dn_dirty_dbufs)
176 177 * dbuf_write_done: none (phys accounting)
177 178 * dmu_object_info_from_dnode: none (accounting)
178 179 * dmu_tx_commit: none
179 180 * dmu_tx_hold_object_impl: none
180 181 * dmu_tx_try_assign: dn_notxholds(cv)
181 182 * dmu_tx_unassign: none
182 183 *
183 184 * dd_lock
184 185 * must be held before:
185 186 * ds_lock
186 187 * ancestors' dd_lock
187 188 * protects:
188 189 * dd_prop_cbs
189 190 * dd_sync_*
190 191 * dd_used_bytes
191 192 * dd_tempreserved
192 193 * dd_space_towrite
193 194 * dd_myname
194 195 * dd_phys accounting?
195 196 * held from:
196 197 * dsl_dir_*
197 198 * dsl_prop_changed_notify: none (dd_prop_cbs)
198 199 * dsl_prop_register: none (dd_prop_cbs)
199 200 * dsl_prop_unregister: none (dd_prop_cbs)
200 201 * dsl_dataset_block_freeable: none (dd_sync_*)
201 202 *
202 203 * os_lock (leaf)
203 204 * protects:
204 205 * os_dirty_dnodes
205 206 * os_free_dnodes
206 207 * os_dnodes
207 208 * os_downgraded_dbufs
208 209 * dn_dirtyblksz
209 210 * dn_dirty_link
210 211 * held from:
211 212 * dnode_create: none (os_dnodes)
212 213 * dnode_destroy: none (os_dnodes)
213 214 * dnode_setdirty: none (dn_dirtyblksz, os_*_dnodes)
214 215 * dnode_free: none (dn_dirtyblksz, os_*_dnodes)
215 216 *
216 217 * ds_lock
217 218 * protects:
218 219 * ds_objset
219 220 * ds_open_refcount
220 221 * ds_snapname
221 222 * ds_phys accounting
222 223 * ds_phys userrefs zapobj
223 224 * ds_reserved
224 225 * held from:
225 226 * dsl_dataset_*
226 227 *
227 228 * dr_mtx (leaf)
228 229 * protects:
229 230 * dr_children
230 231 * held from:
231 232 * dbuf_dirty
232 233 * dbuf_undirty
233 234 * dbuf_sync_indirect
234 235 * dnode_new_blkid
235 236 */
236 237
237 238 struct objset;
238 239 struct dmu_pool;
239 240
240 241 typedef struct dmu_xuio {
241 242 int next;
242 243 int cnt;
243 244 struct arc_buf **bufs;
244 245 iovec_t *iovp;
245 246 } dmu_xuio_t;
246 247
247 248 typedef struct xuio_stats {
248 249 /* loaned yet not returned arc_buf */
249 250 kstat_named_t xuiostat_onloan_rbuf;
250 251 kstat_named_t xuiostat_onloan_wbuf;
251 252 /* whether a copy is made when loaning out a read buffer */
252 253 kstat_named_t xuiostat_rbuf_copied;
253 254 kstat_named_t xuiostat_rbuf_nocopy;
254 255 /* whether a copy is made when assigning a write buffer */
255 256 kstat_named_t xuiostat_wbuf_copied;
256 257 kstat_named_t xuiostat_wbuf_nocopy;
257 258 } xuio_stats_t;
258 259
259 260 static xuio_stats_t xuio_stats = {
260 261 { "onloan_read_buf", KSTAT_DATA_UINT64 },
261 262 { "onloan_write_buf", KSTAT_DATA_UINT64 },
262 263 { "read_buf_copied", KSTAT_DATA_UINT64 },
263 264 { "read_buf_nocopy", KSTAT_DATA_UINT64 },
264 265 { "write_buf_copied", KSTAT_DATA_UINT64 },
265 266 { "write_buf_nocopy", KSTAT_DATA_UINT64 }
266 267 };
267 268
268 269 #define XUIOSTAT_INCR(stat, val) \
269 270 atomic_add_64(&xuio_stats.stat.value.ui64, (val))
270 271 #define XUIOSTAT_BUMP(stat) XUIOSTAT_INCR(stat, 1)
271 272
272 273 /*
273 274 * The list of data whose inclusion in a send stream can be pending from
274 275 * one call to backup_cb to another. Multiple calls to dump_free() and
275 276 * dump_freeobjects() can be aggregated into a single DRR_FREE or
276 277 * DRR_FREEOBJECTS replay record.
277 278 */
278 279 typedef enum {
279 280 PENDING_NONE,
280 281 PENDING_FREE,
281 282 PENDING_FREEOBJECTS
282 283 } dmu_pendop_t;
283 284
284 285 typedef struct dmu_sendarg {
285 286 list_node_t dsa_link;
286 287 dmu_replay_record_t *dsa_drr;
287 288 vnode_t *dsa_vp;
288 289 int dsa_outfd;
289 290 struct proc *dsa_proc;
290 291 offset_t *dsa_off;
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291 292 objset_t *dsa_os;
292 293 zio_cksum_t dsa_zc;
293 294 uint64_t dsa_toguid;
294 295 int dsa_err;
295 296 dmu_pendop_t dsa_pending_op;
296 297 uint64_t dsa_featureflags;
297 298 uint64_t dsa_last_data_object;
298 299 uint64_t dsa_last_data_offset;
299 300 uint64_t dsa_resume_object;
300 301 uint64_t dsa_resume_offset;
302 + boolean_t dsa_skip_free;
301 303 } dmu_sendarg_t;
302 304
303 305 void dmu_object_zapify(objset_t *, uint64_t, dmu_object_type_t, dmu_tx_t *);
304 306 void dmu_object_free_zapified(objset_t *, uint64_t, dmu_tx_t *);
305 307 int dmu_buf_hold_noread(objset_t *, uint64_t, uint64_t,
306 308 void *, dmu_buf_t **);
307 309
308 310 #ifdef __cplusplus
309 311 }
310 312 #endif
311 313
312 314 #endif /* _SYS_DMU_IMPL_H */
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