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5981 Deadlock in dmu_objset_find_dp
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--- old/usr/src/uts/common/fs/zfs/dmu_objset.c
+++ new/usr/src/uts/common/fs/zfs/dmu_objset.c
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]
18 18 *
19 19 * CDDL HEADER END
20 20 */
21 21 /*
22 22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23 23 * Copyright (c) 2012, 2014 by Delphix. All rights reserved.
24 24 * Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
25 25 * Copyright (c) 2013, Joyent, Inc. All rights reserved.
26 26 * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
27 27 * Copyright 2015 Nexenta Systems, Inc. All rights reserved.
28 28 * Copyright (c) 2015, STRATO AG, Inc. All rights reserved.
29 29 */
30 30
31 31 /* Portions Copyright 2010 Robert Milkowski */
32 32
33 33 #include <sys/cred.h>
34 34 #include <sys/zfs_context.h>
35 35 #include <sys/dmu_objset.h>
36 36 #include <sys/dsl_dir.h>
37 37 #include <sys/dsl_dataset.h>
38 38 #include <sys/dsl_prop.h>
39 39 #include <sys/dsl_pool.h>
40 40 #include <sys/dsl_synctask.h>
41 41 #include <sys/dsl_deleg.h>
42 42 #include <sys/dnode.h>
43 43 #include <sys/dbuf.h>
44 44 #include <sys/zvol.h>
45 45 #include <sys/dmu_tx.h>
46 46 #include <sys/zap.h>
47 47 #include <sys/zil.h>
48 48 #include <sys/dmu_impl.h>
49 49 #include <sys/zfs_ioctl.h>
50 50 #include <sys/sa.h>
51 51 #include <sys/zfs_onexit.h>
52 52 #include <sys/dsl_destroy.h>
53 53 #include <sys/vdev.h>
54 54
55 55 /*
56 56 * Needed to close a window in dnode_move() that allows the objset to be freed
57 57 * before it can be safely accessed.
58 58 */
59 59 krwlock_t os_lock;
60 60
61 61 /*
62 62 * Tunable to overwrite the maximum number of threads for the parallization
63 63 * of dmu_objset_find_dp, needed to speed up the import of pools with many
64 64 * datasets.
65 65 * Default is 4 times the number of leaf vdevs.
66 66 */
67 67 int dmu_find_threads = 0;
68 68
69 69 static void dmu_objset_find_dp_cb(void *arg);
70 70
71 71 void
72 72 dmu_objset_init(void)
73 73 {
74 74 rw_init(&os_lock, NULL, RW_DEFAULT, NULL);
75 75 }
76 76
77 77 void
78 78 dmu_objset_fini(void)
79 79 {
80 80 rw_destroy(&os_lock);
81 81 }
82 82
83 83 spa_t *
84 84 dmu_objset_spa(objset_t *os)
85 85 {
86 86 return (os->os_spa);
87 87 }
88 88
89 89 zilog_t *
90 90 dmu_objset_zil(objset_t *os)
91 91 {
92 92 return (os->os_zil);
93 93 }
94 94
95 95 dsl_pool_t *
96 96 dmu_objset_pool(objset_t *os)
97 97 {
98 98 dsl_dataset_t *ds;
99 99
100 100 if ((ds = os->os_dsl_dataset) != NULL && ds->ds_dir)
101 101 return (ds->ds_dir->dd_pool);
102 102 else
103 103 return (spa_get_dsl(os->os_spa));
104 104 }
105 105
106 106 dsl_dataset_t *
107 107 dmu_objset_ds(objset_t *os)
108 108 {
109 109 return (os->os_dsl_dataset);
110 110 }
111 111
112 112 dmu_objset_type_t
113 113 dmu_objset_type(objset_t *os)
114 114 {
115 115 return (os->os_phys->os_type);
116 116 }
117 117
118 118 void
119 119 dmu_objset_name(objset_t *os, char *buf)
120 120 {
121 121 dsl_dataset_name(os->os_dsl_dataset, buf);
122 122 }
123 123
124 124 uint64_t
125 125 dmu_objset_id(objset_t *os)
126 126 {
127 127 dsl_dataset_t *ds = os->os_dsl_dataset;
128 128
129 129 return (ds ? ds->ds_object : 0);
130 130 }
131 131
132 132 zfs_sync_type_t
133 133 dmu_objset_syncprop(objset_t *os)
134 134 {
135 135 return (os->os_sync);
136 136 }
137 137
138 138 zfs_logbias_op_t
139 139 dmu_objset_logbias(objset_t *os)
140 140 {
141 141 return (os->os_logbias);
142 142 }
143 143
144 144 static void
145 145 checksum_changed_cb(void *arg, uint64_t newval)
146 146 {
147 147 objset_t *os = arg;
148 148
149 149 /*
150 150 * Inheritance should have been done by now.
151 151 */
152 152 ASSERT(newval != ZIO_CHECKSUM_INHERIT);
153 153
154 154 os->os_checksum = zio_checksum_select(newval, ZIO_CHECKSUM_ON_VALUE);
155 155 }
156 156
157 157 static void
158 158 compression_changed_cb(void *arg, uint64_t newval)
159 159 {
160 160 objset_t *os = arg;
161 161
162 162 /*
163 163 * Inheritance and range checking should have been done by now.
164 164 */
165 165 ASSERT(newval != ZIO_COMPRESS_INHERIT);
166 166
167 167 os->os_compress = zio_compress_select(os->os_spa, newval,
168 168 ZIO_COMPRESS_ON);
169 169 }
170 170
171 171 static void
172 172 copies_changed_cb(void *arg, uint64_t newval)
173 173 {
174 174 objset_t *os = arg;
175 175
176 176 /*
177 177 * Inheritance and range checking should have been done by now.
178 178 */
179 179 ASSERT(newval > 0);
180 180 ASSERT(newval <= spa_max_replication(os->os_spa));
181 181
182 182 os->os_copies = newval;
183 183 }
184 184
185 185 static void
186 186 dedup_changed_cb(void *arg, uint64_t newval)
187 187 {
188 188 objset_t *os = arg;
189 189 spa_t *spa = os->os_spa;
190 190 enum zio_checksum checksum;
191 191
192 192 /*
193 193 * Inheritance should have been done by now.
194 194 */
195 195 ASSERT(newval != ZIO_CHECKSUM_INHERIT);
196 196
197 197 checksum = zio_checksum_dedup_select(spa, newval, ZIO_CHECKSUM_OFF);
198 198
199 199 os->os_dedup_checksum = checksum & ZIO_CHECKSUM_MASK;
200 200 os->os_dedup_verify = !!(checksum & ZIO_CHECKSUM_VERIFY);
201 201 }
202 202
203 203 static void
204 204 primary_cache_changed_cb(void *arg, uint64_t newval)
205 205 {
206 206 objset_t *os = arg;
207 207
208 208 /*
209 209 * Inheritance and range checking should have been done by now.
210 210 */
211 211 ASSERT(newval == ZFS_CACHE_ALL || newval == ZFS_CACHE_NONE ||
212 212 newval == ZFS_CACHE_METADATA);
213 213
214 214 os->os_primary_cache = newval;
215 215 }
216 216
217 217 static void
218 218 secondary_cache_changed_cb(void *arg, uint64_t newval)
219 219 {
220 220 objset_t *os = arg;
221 221
222 222 /*
223 223 * Inheritance and range checking should have been done by now.
224 224 */
225 225 ASSERT(newval == ZFS_CACHE_ALL || newval == ZFS_CACHE_NONE ||
226 226 newval == ZFS_CACHE_METADATA);
227 227
228 228 os->os_secondary_cache = newval;
229 229 }
230 230
231 231 static void
232 232 sync_changed_cb(void *arg, uint64_t newval)
233 233 {
234 234 objset_t *os = arg;
235 235
236 236 /*
237 237 * Inheritance and range checking should have been done by now.
238 238 */
239 239 ASSERT(newval == ZFS_SYNC_STANDARD || newval == ZFS_SYNC_ALWAYS ||
240 240 newval == ZFS_SYNC_DISABLED);
241 241
242 242 os->os_sync = newval;
243 243 if (os->os_zil)
244 244 zil_set_sync(os->os_zil, newval);
245 245 }
246 246
247 247 static void
248 248 redundant_metadata_changed_cb(void *arg, uint64_t newval)
249 249 {
250 250 objset_t *os = arg;
251 251
252 252 /*
253 253 * Inheritance and range checking should have been done by now.
254 254 */
255 255 ASSERT(newval == ZFS_REDUNDANT_METADATA_ALL ||
256 256 newval == ZFS_REDUNDANT_METADATA_MOST);
257 257
258 258 os->os_redundant_metadata = newval;
259 259 }
260 260
261 261 static void
262 262 logbias_changed_cb(void *arg, uint64_t newval)
263 263 {
264 264 objset_t *os = arg;
265 265
266 266 ASSERT(newval == ZFS_LOGBIAS_LATENCY ||
267 267 newval == ZFS_LOGBIAS_THROUGHPUT);
268 268 os->os_logbias = newval;
269 269 if (os->os_zil)
270 270 zil_set_logbias(os->os_zil, newval);
271 271 }
272 272
273 273 static void
274 274 recordsize_changed_cb(void *arg, uint64_t newval)
275 275 {
276 276 objset_t *os = arg;
277 277
278 278 os->os_recordsize = newval;
279 279 }
280 280
281 281 void
282 282 dmu_objset_byteswap(void *buf, size_t size)
283 283 {
284 284 objset_phys_t *osp = buf;
285 285
286 286 ASSERT(size == OBJSET_OLD_PHYS_SIZE || size == sizeof (objset_phys_t));
287 287 dnode_byteswap(&osp->os_meta_dnode);
288 288 byteswap_uint64_array(&osp->os_zil_header, sizeof (zil_header_t));
289 289 osp->os_type = BSWAP_64(osp->os_type);
290 290 osp->os_flags = BSWAP_64(osp->os_flags);
291 291 if (size == sizeof (objset_phys_t)) {
292 292 dnode_byteswap(&osp->os_userused_dnode);
293 293 dnode_byteswap(&osp->os_groupused_dnode);
294 294 }
295 295 }
296 296
297 297 int
298 298 dmu_objset_open_impl(spa_t *spa, dsl_dataset_t *ds, blkptr_t *bp,
299 299 objset_t **osp)
300 300 {
301 301 objset_t *os;
302 302 int i, err;
303 303
304 304 ASSERT(ds == NULL || MUTEX_HELD(&ds->ds_opening_lock));
305 305
306 306 os = kmem_zalloc(sizeof (objset_t), KM_SLEEP);
307 307 os->os_dsl_dataset = ds;
308 308 os->os_spa = spa;
309 309 os->os_rootbp = bp;
310 310 if (!BP_IS_HOLE(os->os_rootbp)) {
311 311 arc_flags_t aflags = ARC_FLAG_WAIT;
312 312 zbookmark_phys_t zb;
313 313 SET_BOOKMARK(&zb, ds ? ds->ds_object : DMU_META_OBJSET,
314 314 ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID);
315 315
316 316 if (DMU_OS_IS_L2CACHEABLE(os))
317 317 aflags |= ARC_FLAG_L2CACHE;
318 318 if (DMU_OS_IS_L2COMPRESSIBLE(os))
319 319 aflags |= ARC_FLAG_L2COMPRESS;
320 320
321 321 dprintf_bp(os->os_rootbp, "reading %s", "");
322 322 err = arc_read(NULL, spa, os->os_rootbp,
323 323 arc_getbuf_func, &os->os_phys_buf,
324 324 ZIO_PRIORITY_SYNC_READ, ZIO_FLAG_CANFAIL, &aflags, &zb);
325 325 if (err != 0) {
326 326 kmem_free(os, sizeof (objset_t));
327 327 /* convert checksum errors into IO errors */
328 328 if (err == ECKSUM)
329 329 err = SET_ERROR(EIO);
330 330 return (err);
331 331 }
332 332
333 333 /* Increase the blocksize if we are permitted. */
334 334 if (spa_version(spa) >= SPA_VERSION_USERSPACE &&
335 335 arc_buf_size(os->os_phys_buf) < sizeof (objset_phys_t)) {
336 336 arc_buf_t *buf = arc_buf_alloc(spa,
337 337 sizeof (objset_phys_t), &os->os_phys_buf,
338 338 ARC_BUFC_METADATA);
339 339 bzero(buf->b_data, sizeof (objset_phys_t));
340 340 bcopy(os->os_phys_buf->b_data, buf->b_data,
341 341 arc_buf_size(os->os_phys_buf));
342 342 (void) arc_buf_remove_ref(os->os_phys_buf,
343 343 &os->os_phys_buf);
344 344 os->os_phys_buf = buf;
345 345 }
346 346
347 347 os->os_phys = os->os_phys_buf->b_data;
348 348 os->os_flags = os->os_phys->os_flags;
349 349 } else {
350 350 int size = spa_version(spa) >= SPA_VERSION_USERSPACE ?
351 351 sizeof (objset_phys_t) : OBJSET_OLD_PHYS_SIZE;
352 352 os->os_phys_buf = arc_buf_alloc(spa, size,
353 353 &os->os_phys_buf, ARC_BUFC_METADATA);
354 354 os->os_phys = os->os_phys_buf->b_data;
355 355 bzero(os->os_phys, size);
356 356 }
357 357
358 358 /*
359 359 * Note: the changed_cb will be called once before the register
360 360 * func returns, thus changing the checksum/compression from the
361 361 * default (fletcher2/off). Snapshots don't need to know about
362 362 * checksum/compression/copies.
363 363 */
364 364 if (ds != NULL) {
365 365 err = dsl_prop_register(ds,
366 366 zfs_prop_to_name(ZFS_PROP_PRIMARYCACHE),
367 367 primary_cache_changed_cb, os);
368 368 if (err == 0) {
369 369 err = dsl_prop_register(ds,
370 370 zfs_prop_to_name(ZFS_PROP_SECONDARYCACHE),
371 371 secondary_cache_changed_cb, os);
372 372 }
373 373 if (!ds->ds_is_snapshot) {
374 374 if (err == 0) {
375 375 err = dsl_prop_register(ds,
376 376 zfs_prop_to_name(ZFS_PROP_CHECKSUM),
377 377 checksum_changed_cb, os);
378 378 }
379 379 if (err == 0) {
380 380 err = dsl_prop_register(ds,
381 381 zfs_prop_to_name(ZFS_PROP_COMPRESSION),
382 382 compression_changed_cb, os);
383 383 }
384 384 if (err == 0) {
385 385 err = dsl_prop_register(ds,
386 386 zfs_prop_to_name(ZFS_PROP_COPIES),
387 387 copies_changed_cb, os);
388 388 }
389 389 if (err == 0) {
390 390 err = dsl_prop_register(ds,
391 391 zfs_prop_to_name(ZFS_PROP_DEDUP),
392 392 dedup_changed_cb, os);
393 393 }
394 394 if (err == 0) {
395 395 err = dsl_prop_register(ds,
396 396 zfs_prop_to_name(ZFS_PROP_LOGBIAS),
397 397 logbias_changed_cb, os);
398 398 }
399 399 if (err == 0) {
400 400 err = dsl_prop_register(ds,
401 401 zfs_prop_to_name(ZFS_PROP_SYNC),
402 402 sync_changed_cb, os);
403 403 }
404 404 if (err == 0) {
405 405 err = dsl_prop_register(ds,
406 406 zfs_prop_to_name(
407 407 ZFS_PROP_REDUNDANT_METADATA),
408 408 redundant_metadata_changed_cb, os);
409 409 }
410 410 if (err == 0) {
411 411 err = dsl_prop_register(ds,
412 412 zfs_prop_to_name(ZFS_PROP_RECORDSIZE),
413 413 recordsize_changed_cb, os);
414 414 }
415 415 }
416 416 if (err != 0) {
417 417 VERIFY(arc_buf_remove_ref(os->os_phys_buf,
418 418 &os->os_phys_buf));
419 419 kmem_free(os, sizeof (objset_t));
420 420 return (err);
421 421 }
422 422 } else {
423 423 /* It's the meta-objset. */
424 424 os->os_checksum = ZIO_CHECKSUM_FLETCHER_4;
425 425 os->os_compress = ZIO_COMPRESS_ON;
426 426 os->os_copies = spa_max_replication(spa);
427 427 os->os_dedup_checksum = ZIO_CHECKSUM_OFF;
428 428 os->os_dedup_verify = B_FALSE;
429 429 os->os_logbias = ZFS_LOGBIAS_LATENCY;
430 430 os->os_sync = ZFS_SYNC_STANDARD;
431 431 os->os_primary_cache = ZFS_CACHE_ALL;
432 432 os->os_secondary_cache = ZFS_CACHE_ALL;
433 433 }
434 434
435 435 if (ds == NULL || !ds->ds_is_snapshot)
436 436 os->os_zil_header = os->os_phys->os_zil_header;
437 437 os->os_zil = zil_alloc(os, &os->os_zil_header);
438 438
439 439 for (i = 0; i < TXG_SIZE; i++) {
440 440 list_create(&os->os_dirty_dnodes[i], sizeof (dnode_t),
441 441 offsetof(dnode_t, dn_dirty_link[i]));
442 442 list_create(&os->os_free_dnodes[i], sizeof (dnode_t),
443 443 offsetof(dnode_t, dn_dirty_link[i]));
444 444 }
445 445 list_create(&os->os_dnodes, sizeof (dnode_t),
446 446 offsetof(dnode_t, dn_link));
447 447 list_create(&os->os_downgraded_dbufs, sizeof (dmu_buf_impl_t),
448 448 offsetof(dmu_buf_impl_t, db_link));
449 449
450 450 mutex_init(&os->os_lock, NULL, MUTEX_DEFAULT, NULL);
451 451 mutex_init(&os->os_obj_lock, NULL, MUTEX_DEFAULT, NULL);
452 452 mutex_init(&os->os_user_ptr_lock, NULL, MUTEX_DEFAULT, NULL);
453 453
454 454 dnode_special_open(os, &os->os_phys->os_meta_dnode,
455 455 DMU_META_DNODE_OBJECT, &os->os_meta_dnode);
456 456 if (arc_buf_size(os->os_phys_buf) >= sizeof (objset_phys_t)) {
457 457 dnode_special_open(os, &os->os_phys->os_userused_dnode,
458 458 DMU_USERUSED_OBJECT, &os->os_userused_dnode);
459 459 dnode_special_open(os, &os->os_phys->os_groupused_dnode,
460 460 DMU_GROUPUSED_OBJECT, &os->os_groupused_dnode);
461 461 }
462 462
463 463 *osp = os;
464 464 return (0);
465 465 }
466 466
467 467 int
468 468 dmu_objset_from_ds(dsl_dataset_t *ds, objset_t **osp)
469 469 {
470 470 int err = 0;
471 471
472 472 mutex_enter(&ds->ds_opening_lock);
473 473 if (ds->ds_objset == NULL) {
474 474 objset_t *os;
475 475 err = dmu_objset_open_impl(dsl_dataset_get_spa(ds),
476 476 ds, dsl_dataset_get_blkptr(ds), &os);
477 477
478 478 if (err == 0) {
479 479 mutex_enter(&ds->ds_lock);
480 480 ASSERT(ds->ds_objset == NULL);
481 481 ds->ds_objset = os;
482 482 mutex_exit(&ds->ds_lock);
483 483 }
484 484 }
485 485 *osp = ds->ds_objset;
486 486 mutex_exit(&ds->ds_opening_lock);
487 487 return (err);
488 488 }
489 489
490 490 /*
491 491 * Holds the pool while the objset is held. Therefore only one objset
492 492 * can be held at a time.
493 493 */
494 494 int
495 495 dmu_objset_hold(const char *name, void *tag, objset_t **osp)
496 496 {
497 497 dsl_pool_t *dp;
498 498 dsl_dataset_t *ds;
499 499 int err;
500 500
501 501 err = dsl_pool_hold(name, tag, &dp);
502 502 if (err != 0)
503 503 return (err);
504 504 err = dsl_dataset_hold(dp, name, tag, &ds);
505 505 if (err != 0) {
506 506 dsl_pool_rele(dp, tag);
507 507 return (err);
508 508 }
509 509
510 510 err = dmu_objset_from_ds(ds, osp);
511 511 if (err != 0) {
512 512 dsl_dataset_rele(ds, tag);
513 513 dsl_pool_rele(dp, tag);
514 514 }
515 515
516 516 return (err);
517 517 }
518 518
519 519 static int
520 520 dmu_objset_own_impl(dsl_dataset_t *ds, dmu_objset_type_t type,
521 521 boolean_t readonly, void *tag, objset_t **osp)
522 522 {
523 523 int err;
524 524
525 525 err = dmu_objset_from_ds(ds, osp);
526 526 if (err != 0) {
527 527 dsl_dataset_disown(ds, tag);
528 528 } else if (type != DMU_OST_ANY && type != (*osp)->os_phys->os_type) {
529 529 dsl_dataset_disown(ds, tag);
530 530 return (SET_ERROR(EINVAL));
531 531 } else if (!readonly && dsl_dataset_is_snapshot(ds)) {
532 532 dsl_dataset_disown(ds, tag);
533 533 return (SET_ERROR(EROFS));
534 534 }
535 535 return (err);
536 536 }
537 537
538 538 /*
539 539 * dsl_pool must not be held when this is called.
540 540 * Upon successful return, there will be a longhold on the dataset,
541 541 * and the dsl_pool will not be held.
542 542 */
543 543 int
544 544 dmu_objset_own(const char *name, dmu_objset_type_t type,
545 545 boolean_t readonly, void *tag, objset_t **osp)
546 546 {
547 547 dsl_pool_t *dp;
548 548 dsl_dataset_t *ds;
549 549 int err;
550 550
551 551 err = dsl_pool_hold(name, FTAG, &dp);
552 552 if (err != 0)
553 553 return (err);
554 554 err = dsl_dataset_own(dp, name, tag, &ds);
555 555 if (err != 0) {
556 556 dsl_pool_rele(dp, FTAG);
557 557 return (err);
558 558 }
559 559 err = dmu_objset_own_impl(ds, type, readonly, tag, osp);
560 560 dsl_pool_rele(dp, FTAG);
561 561
562 562 return (err);
563 563 }
564 564
565 565 int
566 566 dmu_objset_own_obj(dsl_pool_t *dp, uint64_t obj, dmu_objset_type_t type,
567 567 boolean_t readonly, void *tag, objset_t **osp)
568 568 {
569 569 dsl_dataset_t *ds;
570 570 int err;
571 571
572 572 err = dsl_dataset_own_obj(dp, obj, tag, &ds);
573 573 if (err != 0)
574 574 return (err);
575 575
576 576 return (dmu_objset_own_impl(ds, type, readonly, tag, osp));
577 577 }
578 578
579 579 void
580 580 dmu_objset_rele(objset_t *os, void *tag)
581 581 {
582 582 dsl_pool_t *dp = dmu_objset_pool(os);
583 583 dsl_dataset_rele(os->os_dsl_dataset, tag);
584 584 dsl_pool_rele(dp, tag);
585 585 }
586 586
587 587 /*
588 588 * When we are called, os MUST refer to an objset associated with a dataset
589 589 * that is owned by 'tag'; that is, is held and long held by 'tag' and ds_owner
590 590 * == tag. We will then release and reacquire ownership of the dataset while
591 591 * holding the pool config_rwlock to avoid intervening namespace or ownership
592 592 * changes may occur.
593 593 *
594 594 * This exists solely to accommodate zfs_ioc_userspace_upgrade()'s desire to
595 595 * release the hold on its dataset and acquire a new one on the dataset of the
596 596 * same name so that it can be partially torn down and reconstructed.
597 597 */
598 598 void
599 599 dmu_objset_refresh_ownership(objset_t *os, void *tag)
600 600 {
601 601 dsl_pool_t *dp;
602 602 dsl_dataset_t *ds, *newds;
603 603 char name[MAXNAMELEN];
604 604
605 605 ds = os->os_dsl_dataset;
606 606 VERIFY3P(ds, !=, NULL);
607 607 VERIFY3P(ds->ds_owner, ==, tag);
608 608 VERIFY(dsl_dataset_long_held(ds));
609 609
610 610 dsl_dataset_name(ds, name);
611 611 dp = dmu_objset_pool(os);
612 612 dsl_pool_config_enter(dp, FTAG);
613 613 dmu_objset_disown(os, tag);
614 614 VERIFY0(dsl_dataset_own(dp, name, tag, &newds));
615 615 VERIFY3P(newds, ==, os->os_dsl_dataset);
616 616 dsl_pool_config_exit(dp, FTAG);
617 617 }
618 618
619 619 void
620 620 dmu_objset_disown(objset_t *os, void *tag)
621 621 {
622 622 dsl_dataset_disown(os->os_dsl_dataset, tag);
623 623 }
624 624
625 625 void
626 626 dmu_objset_evict_dbufs(objset_t *os)
627 627 {
628 628 dnode_t dn_marker;
629 629 dnode_t *dn;
630 630
631 631 mutex_enter(&os->os_lock);
632 632 dn = list_head(&os->os_dnodes);
633 633 while (dn != NULL) {
634 634 /*
635 635 * Skip dnodes without holds. We have to do this dance
636 636 * because dnode_add_ref() only works if there is already a
637 637 * hold. If the dnode has no holds, then it has no dbufs.
638 638 */
639 639 if (dnode_add_ref(dn, FTAG)) {
640 640 list_insert_after(&os->os_dnodes, dn, &dn_marker);
641 641 mutex_exit(&os->os_lock);
642 642
643 643 dnode_evict_dbufs(dn);
644 644 dnode_rele(dn, FTAG);
645 645
646 646 mutex_enter(&os->os_lock);
647 647 dn = list_next(&os->os_dnodes, &dn_marker);
648 648 list_remove(&os->os_dnodes, &dn_marker);
649 649 } else {
650 650 dn = list_next(&os->os_dnodes, dn);
651 651 }
652 652 }
653 653 mutex_exit(&os->os_lock);
654 654
655 655 if (DMU_USERUSED_DNODE(os) != NULL) {
656 656 dnode_evict_dbufs(DMU_GROUPUSED_DNODE(os));
657 657 dnode_evict_dbufs(DMU_USERUSED_DNODE(os));
658 658 }
659 659 dnode_evict_dbufs(DMU_META_DNODE(os));
660 660 }
661 661
662 662 /*
663 663 * Objset eviction processing is split into into two pieces.
664 664 * The first marks the objset as evicting, evicts any dbufs that
665 665 * have a refcount of zero, and then queues up the objset for the
666 666 * second phase of eviction. Once os->os_dnodes has been cleared by
667 667 * dnode_buf_pageout()->dnode_destroy(), the second phase is executed.
668 668 * The second phase closes the special dnodes, dequeues the objset from
669 669 * the list of those undergoing eviction, and finally frees the objset.
670 670 *
671 671 * NOTE: Due to asynchronous eviction processing (invocation of
672 672 * dnode_buf_pageout()), it is possible for the meta dnode for the
673 673 * objset to have no holds even though os->os_dnodes is not empty.
674 674 */
675 675 void
676 676 dmu_objset_evict(objset_t *os)
677 677 {
678 678 dsl_dataset_t *ds = os->os_dsl_dataset;
679 679
680 680 for (int t = 0; t < TXG_SIZE; t++)
681 681 ASSERT(!dmu_objset_is_dirty(os, t));
682 682
683 683 if (ds) {
684 684 if (!ds->ds_is_snapshot) {
685 685 VERIFY0(dsl_prop_unregister(ds,
686 686 zfs_prop_to_name(ZFS_PROP_CHECKSUM),
687 687 checksum_changed_cb, os));
688 688 VERIFY0(dsl_prop_unregister(ds,
689 689 zfs_prop_to_name(ZFS_PROP_COMPRESSION),
690 690 compression_changed_cb, os));
691 691 VERIFY0(dsl_prop_unregister(ds,
692 692 zfs_prop_to_name(ZFS_PROP_COPIES),
693 693 copies_changed_cb, os));
694 694 VERIFY0(dsl_prop_unregister(ds,
695 695 zfs_prop_to_name(ZFS_PROP_DEDUP),
696 696 dedup_changed_cb, os));
697 697 VERIFY0(dsl_prop_unregister(ds,
698 698 zfs_prop_to_name(ZFS_PROP_LOGBIAS),
699 699 logbias_changed_cb, os));
700 700 VERIFY0(dsl_prop_unregister(ds,
701 701 zfs_prop_to_name(ZFS_PROP_SYNC),
702 702 sync_changed_cb, os));
703 703 VERIFY0(dsl_prop_unregister(ds,
704 704 zfs_prop_to_name(ZFS_PROP_REDUNDANT_METADATA),
705 705 redundant_metadata_changed_cb, os));
706 706 VERIFY0(dsl_prop_unregister(ds,
707 707 zfs_prop_to_name(ZFS_PROP_RECORDSIZE),
708 708 recordsize_changed_cb, os));
709 709 }
710 710 VERIFY0(dsl_prop_unregister(ds,
711 711 zfs_prop_to_name(ZFS_PROP_PRIMARYCACHE),
712 712 primary_cache_changed_cb, os));
713 713 VERIFY0(dsl_prop_unregister(ds,
714 714 zfs_prop_to_name(ZFS_PROP_SECONDARYCACHE),
715 715 secondary_cache_changed_cb, os));
716 716 }
717 717
718 718 if (os->os_sa)
719 719 sa_tear_down(os);
720 720
721 721 os->os_evicting = B_TRUE;
722 722 dmu_objset_evict_dbufs(os);
723 723
724 724 mutex_enter(&os->os_lock);
725 725 spa_evicting_os_register(os->os_spa, os);
726 726 if (list_is_empty(&os->os_dnodes)) {
727 727 mutex_exit(&os->os_lock);
728 728 dmu_objset_evict_done(os);
729 729 } else {
730 730 mutex_exit(&os->os_lock);
731 731 }
732 732 }
733 733
734 734 void
735 735 dmu_objset_evict_done(objset_t *os)
736 736 {
737 737 ASSERT3P(list_head(&os->os_dnodes), ==, NULL);
738 738
739 739 dnode_special_close(&os->os_meta_dnode);
740 740 if (DMU_USERUSED_DNODE(os)) {
741 741 dnode_special_close(&os->os_userused_dnode);
742 742 dnode_special_close(&os->os_groupused_dnode);
743 743 }
744 744 zil_free(os->os_zil);
745 745
746 746 VERIFY(arc_buf_remove_ref(os->os_phys_buf, &os->os_phys_buf));
747 747
748 748 /*
749 749 * This is a barrier to prevent the objset from going away in
750 750 * dnode_move() until we can safely ensure that the objset is still in
751 751 * use. We consider the objset valid before the barrier and invalid
752 752 * after the barrier.
753 753 */
754 754 rw_enter(&os_lock, RW_READER);
755 755 rw_exit(&os_lock);
756 756
757 757 mutex_destroy(&os->os_lock);
758 758 mutex_destroy(&os->os_obj_lock);
759 759 mutex_destroy(&os->os_user_ptr_lock);
760 760 spa_evicting_os_deregister(os->os_spa, os);
761 761 kmem_free(os, sizeof (objset_t));
762 762 }
763 763
764 764 timestruc_t
765 765 dmu_objset_snap_cmtime(objset_t *os)
766 766 {
767 767 return (dsl_dir_snap_cmtime(os->os_dsl_dataset->ds_dir));
768 768 }
769 769
770 770 /* called from dsl for meta-objset */
771 771 objset_t *
772 772 dmu_objset_create_impl(spa_t *spa, dsl_dataset_t *ds, blkptr_t *bp,
773 773 dmu_objset_type_t type, dmu_tx_t *tx)
774 774 {
775 775 objset_t *os;
776 776 dnode_t *mdn;
777 777
778 778 ASSERT(dmu_tx_is_syncing(tx));
779 779
780 780 if (ds != NULL)
781 781 VERIFY0(dmu_objset_from_ds(ds, &os));
782 782 else
783 783 VERIFY0(dmu_objset_open_impl(spa, NULL, bp, &os));
784 784
785 785 mdn = DMU_META_DNODE(os);
786 786
787 787 dnode_allocate(mdn, DMU_OT_DNODE, 1 << DNODE_BLOCK_SHIFT,
788 788 DN_MAX_INDBLKSHIFT, DMU_OT_NONE, 0, tx);
789 789
790 790 /*
791 791 * We don't want to have to increase the meta-dnode's nlevels
792 792 * later, because then we could do it in quescing context while
793 793 * we are also accessing it in open context.
794 794 *
795 795 * This precaution is not necessary for the MOS (ds == NULL),
796 796 * because the MOS is only updated in syncing context.
797 797 * This is most fortunate: the MOS is the only objset that
798 798 * needs to be synced multiple times as spa_sync() iterates
799 799 * to convergence, so minimizing its dn_nlevels matters.
800 800 */
801 801 if (ds != NULL) {
802 802 int levels = 1;
803 803
804 804 /*
805 805 * Determine the number of levels necessary for the meta-dnode
806 806 * to contain DN_MAX_OBJECT dnodes.
807 807 */
808 808 while ((uint64_t)mdn->dn_nblkptr << (mdn->dn_datablkshift +
809 809 (levels - 1) * (mdn->dn_indblkshift - SPA_BLKPTRSHIFT)) <
810 810 DN_MAX_OBJECT * sizeof (dnode_phys_t))
811 811 levels++;
812 812
813 813 mdn->dn_next_nlevels[tx->tx_txg & TXG_MASK] =
814 814 mdn->dn_nlevels = levels;
815 815 }
816 816
817 817 ASSERT(type != DMU_OST_NONE);
818 818 ASSERT(type != DMU_OST_ANY);
819 819 ASSERT(type < DMU_OST_NUMTYPES);
820 820 os->os_phys->os_type = type;
821 821 if (dmu_objset_userused_enabled(os)) {
822 822 os->os_phys->os_flags |= OBJSET_FLAG_USERACCOUNTING_COMPLETE;
823 823 os->os_flags = os->os_phys->os_flags;
824 824 }
825 825
826 826 dsl_dataset_dirty(ds, tx);
827 827
828 828 return (os);
829 829 }
830 830
831 831 typedef struct dmu_objset_create_arg {
832 832 const char *doca_name;
833 833 cred_t *doca_cred;
834 834 void (*doca_userfunc)(objset_t *os, void *arg,
835 835 cred_t *cr, dmu_tx_t *tx);
836 836 void *doca_userarg;
837 837 dmu_objset_type_t doca_type;
838 838 uint64_t doca_flags;
839 839 } dmu_objset_create_arg_t;
840 840
841 841 /*ARGSUSED*/
842 842 static int
843 843 dmu_objset_create_check(void *arg, dmu_tx_t *tx)
844 844 {
845 845 dmu_objset_create_arg_t *doca = arg;
846 846 dsl_pool_t *dp = dmu_tx_pool(tx);
847 847 dsl_dir_t *pdd;
848 848 const char *tail;
849 849 int error;
850 850
851 851 if (strchr(doca->doca_name, '@') != NULL)
852 852 return (SET_ERROR(EINVAL));
853 853
854 854 error = dsl_dir_hold(dp, doca->doca_name, FTAG, &pdd, &tail);
855 855 if (error != 0)
856 856 return (error);
857 857 if (tail == NULL) {
858 858 dsl_dir_rele(pdd, FTAG);
859 859 return (SET_ERROR(EEXIST));
860 860 }
861 861 error = dsl_fs_ss_limit_check(pdd, 1, ZFS_PROP_FILESYSTEM_LIMIT, NULL,
862 862 doca->doca_cred);
863 863 dsl_dir_rele(pdd, FTAG);
864 864
865 865 return (error);
866 866 }
867 867
868 868 static void
869 869 dmu_objset_create_sync(void *arg, dmu_tx_t *tx)
870 870 {
871 871 dmu_objset_create_arg_t *doca = arg;
872 872 dsl_pool_t *dp = dmu_tx_pool(tx);
873 873 dsl_dir_t *pdd;
874 874 const char *tail;
875 875 dsl_dataset_t *ds;
876 876 uint64_t obj;
877 877 blkptr_t *bp;
878 878 objset_t *os;
879 879
880 880 VERIFY0(dsl_dir_hold(dp, doca->doca_name, FTAG, &pdd, &tail));
881 881
882 882 obj = dsl_dataset_create_sync(pdd, tail, NULL, doca->doca_flags,
883 883 doca->doca_cred, tx);
884 884
885 885 VERIFY0(dsl_dataset_hold_obj(pdd->dd_pool, obj, FTAG, &ds));
886 886 bp = dsl_dataset_get_blkptr(ds);
887 887 os = dmu_objset_create_impl(pdd->dd_pool->dp_spa,
888 888 ds, bp, doca->doca_type, tx);
889 889
890 890 if (doca->doca_userfunc != NULL) {
891 891 doca->doca_userfunc(os, doca->doca_userarg,
892 892 doca->doca_cred, tx);
893 893 }
894 894
895 895 spa_history_log_internal_ds(ds, "create", tx, "");
896 896 dsl_dataset_rele(ds, FTAG);
897 897 dsl_dir_rele(pdd, FTAG);
898 898 }
899 899
900 900 int
901 901 dmu_objset_create(const char *name, dmu_objset_type_t type, uint64_t flags,
902 902 void (*func)(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx), void *arg)
903 903 {
904 904 dmu_objset_create_arg_t doca;
905 905
906 906 doca.doca_name = name;
907 907 doca.doca_cred = CRED();
908 908 doca.doca_flags = flags;
909 909 doca.doca_userfunc = func;
910 910 doca.doca_userarg = arg;
911 911 doca.doca_type = type;
912 912
913 913 return (dsl_sync_task(name,
914 914 dmu_objset_create_check, dmu_objset_create_sync, &doca,
915 915 5, ZFS_SPACE_CHECK_NORMAL));
916 916 }
917 917
918 918 typedef struct dmu_objset_clone_arg {
919 919 const char *doca_clone;
920 920 const char *doca_origin;
921 921 cred_t *doca_cred;
922 922 } dmu_objset_clone_arg_t;
923 923
924 924 /*ARGSUSED*/
925 925 static int
926 926 dmu_objset_clone_check(void *arg, dmu_tx_t *tx)
927 927 {
928 928 dmu_objset_clone_arg_t *doca = arg;
929 929 dsl_dir_t *pdd;
930 930 const char *tail;
931 931 int error;
932 932 dsl_dataset_t *origin;
933 933 dsl_pool_t *dp = dmu_tx_pool(tx);
934 934
935 935 if (strchr(doca->doca_clone, '@') != NULL)
936 936 return (SET_ERROR(EINVAL));
937 937
938 938 error = dsl_dir_hold(dp, doca->doca_clone, FTAG, &pdd, &tail);
939 939 if (error != 0)
940 940 return (error);
941 941 if (tail == NULL) {
942 942 dsl_dir_rele(pdd, FTAG);
943 943 return (SET_ERROR(EEXIST));
944 944 }
945 945
946 946 error = dsl_fs_ss_limit_check(pdd, 1, ZFS_PROP_FILESYSTEM_LIMIT, NULL,
947 947 doca->doca_cred);
948 948 if (error != 0) {
949 949 dsl_dir_rele(pdd, FTAG);
950 950 return (SET_ERROR(EDQUOT));
951 951 }
952 952 dsl_dir_rele(pdd, FTAG);
953 953
954 954 error = dsl_dataset_hold(dp, doca->doca_origin, FTAG, &origin);
955 955 if (error != 0)
956 956 return (error);
957 957
958 958 /* You can only clone snapshots, not the head datasets. */
959 959 if (!origin->ds_is_snapshot) {
960 960 dsl_dataset_rele(origin, FTAG);
961 961 return (SET_ERROR(EINVAL));
962 962 }
963 963 dsl_dataset_rele(origin, FTAG);
964 964
965 965 return (0);
966 966 }
967 967
968 968 static void
969 969 dmu_objset_clone_sync(void *arg, dmu_tx_t *tx)
970 970 {
971 971 dmu_objset_clone_arg_t *doca = arg;
972 972 dsl_pool_t *dp = dmu_tx_pool(tx);
973 973 dsl_dir_t *pdd;
974 974 const char *tail;
975 975 dsl_dataset_t *origin, *ds;
976 976 uint64_t obj;
977 977 char namebuf[MAXNAMELEN];
978 978
979 979 VERIFY0(dsl_dir_hold(dp, doca->doca_clone, FTAG, &pdd, &tail));
980 980 VERIFY0(dsl_dataset_hold(dp, doca->doca_origin, FTAG, &origin));
981 981
982 982 obj = dsl_dataset_create_sync(pdd, tail, origin, 0,
983 983 doca->doca_cred, tx);
984 984
985 985 VERIFY0(dsl_dataset_hold_obj(pdd->dd_pool, obj, FTAG, &ds));
986 986 dsl_dataset_name(origin, namebuf);
987 987 spa_history_log_internal_ds(ds, "clone", tx,
988 988 "origin=%s (%llu)", namebuf, origin->ds_object);
989 989 dsl_dataset_rele(ds, FTAG);
990 990 dsl_dataset_rele(origin, FTAG);
991 991 dsl_dir_rele(pdd, FTAG);
992 992 }
993 993
994 994 int
995 995 dmu_objset_clone(const char *clone, const char *origin)
996 996 {
997 997 dmu_objset_clone_arg_t doca;
998 998
999 999 doca.doca_clone = clone;
1000 1000 doca.doca_origin = origin;
1001 1001 doca.doca_cred = CRED();
1002 1002
1003 1003 return (dsl_sync_task(clone,
1004 1004 dmu_objset_clone_check, dmu_objset_clone_sync, &doca,
1005 1005 5, ZFS_SPACE_CHECK_NORMAL));
1006 1006 }
1007 1007
1008 1008 int
1009 1009 dmu_objset_snapshot_one(const char *fsname, const char *snapname)
1010 1010 {
1011 1011 int err;
1012 1012 char *longsnap = kmem_asprintf("%s@%s", fsname, snapname);
1013 1013 nvlist_t *snaps = fnvlist_alloc();
1014 1014
1015 1015 fnvlist_add_boolean(snaps, longsnap);
1016 1016 strfree(longsnap);
1017 1017 err = dsl_dataset_snapshot(snaps, NULL, NULL);
1018 1018 fnvlist_free(snaps);
1019 1019 return (err);
1020 1020 }
1021 1021
1022 1022 static void
1023 1023 dmu_objset_sync_dnodes(list_t *list, list_t *newlist, dmu_tx_t *tx)
1024 1024 {
1025 1025 dnode_t *dn;
1026 1026
1027 1027 while (dn = list_head(list)) {
1028 1028 ASSERT(dn->dn_object != DMU_META_DNODE_OBJECT);
1029 1029 ASSERT(dn->dn_dbuf->db_data_pending);
1030 1030 /*
1031 1031 * Initialize dn_zio outside dnode_sync() because the
1032 1032 * meta-dnode needs to set it ouside dnode_sync().
1033 1033 */
1034 1034 dn->dn_zio = dn->dn_dbuf->db_data_pending->dr_zio;
1035 1035 ASSERT(dn->dn_zio);
1036 1036
1037 1037 ASSERT3U(dn->dn_nlevels, <=, DN_MAX_LEVELS);
1038 1038 list_remove(list, dn);
1039 1039
1040 1040 if (newlist) {
1041 1041 (void) dnode_add_ref(dn, newlist);
1042 1042 list_insert_tail(newlist, dn);
1043 1043 }
1044 1044
1045 1045 dnode_sync(dn, tx);
1046 1046 }
1047 1047 }
1048 1048
1049 1049 /* ARGSUSED */
1050 1050 static void
1051 1051 dmu_objset_write_ready(zio_t *zio, arc_buf_t *abuf, void *arg)
1052 1052 {
1053 1053 blkptr_t *bp = zio->io_bp;
1054 1054 objset_t *os = arg;
1055 1055 dnode_phys_t *dnp = &os->os_phys->os_meta_dnode;
1056 1056
1057 1057 ASSERT(!BP_IS_EMBEDDED(bp));
1058 1058 ASSERT3P(bp, ==, os->os_rootbp);
1059 1059 ASSERT3U(BP_GET_TYPE(bp), ==, DMU_OT_OBJSET);
1060 1060 ASSERT0(BP_GET_LEVEL(bp));
1061 1061
1062 1062 /*
1063 1063 * Update rootbp fill count: it should be the number of objects
1064 1064 * allocated in the object set (not counting the "special"
1065 1065 * objects that are stored in the objset_phys_t -- the meta
1066 1066 * dnode and user/group accounting objects).
1067 1067 */
1068 1068 bp->blk_fill = 0;
1069 1069 for (int i = 0; i < dnp->dn_nblkptr; i++)
1070 1070 bp->blk_fill += BP_GET_FILL(&dnp->dn_blkptr[i]);
1071 1071 }
1072 1072
1073 1073 /* ARGSUSED */
1074 1074 static void
1075 1075 dmu_objset_write_done(zio_t *zio, arc_buf_t *abuf, void *arg)
1076 1076 {
1077 1077 blkptr_t *bp = zio->io_bp;
1078 1078 blkptr_t *bp_orig = &zio->io_bp_orig;
1079 1079 objset_t *os = arg;
1080 1080
1081 1081 if (zio->io_flags & ZIO_FLAG_IO_REWRITE) {
1082 1082 ASSERT(BP_EQUAL(bp, bp_orig));
1083 1083 } else {
1084 1084 dsl_dataset_t *ds = os->os_dsl_dataset;
1085 1085 dmu_tx_t *tx = os->os_synctx;
1086 1086
1087 1087 (void) dsl_dataset_block_kill(ds, bp_orig, tx, B_TRUE);
1088 1088 dsl_dataset_block_born(ds, bp, tx);
1089 1089 }
1090 1090 }
1091 1091
1092 1092 /* called from dsl */
1093 1093 void
1094 1094 dmu_objset_sync(objset_t *os, zio_t *pio, dmu_tx_t *tx)
1095 1095 {
1096 1096 int txgoff;
1097 1097 zbookmark_phys_t zb;
1098 1098 zio_prop_t zp;
1099 1099 zio_t *zio;
1100 1100 list_t *list;
1101 1101 list_t *newlist = NULL;
1102 1102 dbuf_dirty_record_t *dr;
1103 1103
1104 1104 dprintf_ds(os->os_dsl_dataset, "txg=%llu\n", tx->tx_txg);
1105 1105
1106 1106 ASSERT(dmu_tx_is_syncing(tx));
1107 1107 /* XXX the write_done callback should really give us the tx... */
1108 1108 os->os_synctx = tx;
1109 1109
1110 1110 if (os->os_dsl_dataset == NULL) {
1111 1111 /*
1112 1112 * This is the MOS. If we have upgraded,
1113 1113 * spa_max_replication() could change, so reset
1114 1114 * os_copies here.
1115 1115 */
1116 1116 os->os_copies = spa_max_replication(os->os_spa);
1117 1117 }
1118 1118
1119 1119 /*
1120 1120 * Create the root block IO
1121 1121 */
1122 1122 SET_BOOKMARK(&zb, os->os_dsl_dataset ?
1123 1123 os->os_dsl_dataset->ds_object : DMU_META_OBJSET,
1124 1124 ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID);
1125 1125 arc_release(os->os_phys_buf, &os->os_phys_buf);
1126 1126
1127 1127 dmu_write_policy(os, NULL, 0, 0, &zp);
1128 1128
1129 1129 zio = arc_write(pio, os->os_spa, tx->tx_txg,
1130 1130 os->os_rootbp, os->os_phys_buf, DMU_OS_IS_L2CACHEABLE(os),
1131 1131 DMU_OS_IS_L2COMPRESSIBLE(os), &zp, dmu_objset_write_ready,
1132 1132 NULL, dmu_objset_write_done, os, ZIO_PRIORITY_ASYNC_WRITE,
1133 1133 ZIO_FLAG_MUSTSUCCEED, &zb);
1134 1134
1135 1135 /*
1136 1136 * Sync special dnodes - the parent IO for the sync is the root block
1137 1137 */
1138 1138 DMU_META_DNODE(os)->dn_zio = zio;
1139 1139 dnode_sync(DMU_META_DNODE(os), tx);
1140 1140
1141 1141 os->os_phys->os_flags = os->os_flags;
1142 1142
1143 1143 if (DMU_USERUSED_DNODE(os) &&
1144 1144 DMU_USERUSED_DNODE(os)->dn_type != DMU_OT_NONE) {
1145 1145 DMU_USERUSED_DNODE(os)->dn_zio = zio;
1146 1146 dnode_sync(DMU_USERUSED_DNODE(os), tx);
1147 1147 DMU_GROUPUSED_DNODE(os)->dn_zio = zio;
1148 1148 dnode_sync(DMU_GROUPUSED_DNODE(os), tx);
1149 1149 }
1150 1150
1151 1151 txgoff = tx->tx_txg & TXG_MASK;
1152 1152
1153 1153 if (dmu_objset_userused_enabled(os)) {
1154 1154 newlist = &os->os_synced_dnodes;
1155 1155 /*
1156 1156 * We must create the list here because it uses the
1157 1157 * dn_dirty_link[] of this txg.
1158 1158 */
1159 1159 list_create(newlist, sizeof (dnode_t),
1160 1160 offsetof(dnode_t, dn_dirty_link[txgoff]));
1161 1161 }
1162 1162
1163 1163 dmu_objset_sync_dnodes(&os->os_free_dnodes[txgoff], newlist, tx);
1164 1164 dmu_objset_sync_dnodes(&os->os_dirty_dnodes[txgoff], newlist, tx);
1165 1165
1166 1166 list = &DMU_META_DNODE(os)->dn_dirty_records[txgoff];
1167 1167 while (dr = list_head(list)) {
1168 1168 ASSERT0(dr->dr_dbuf->db_level);
1169 1169 list_remove(list, dr);
1170 1170 if (dr->dr_zio)
1171 1171 zio_nowait(dr->dr_zio);
1172 1172 }
1173 1173 /*
1174 1174 * Free intent log blocks up to this tx.
1175 1175 */
1176 1176 zil_sync(os->os_zil, tx);
1177 1177 os->os_phys->os_zil_header = os->os_zil_header;
1178 1178 zio_nowait(zio);
1179 1179 }
1180 1180
1181 1181 boolean_t
1182 1182 dmu_objset_is_dirty(objset_t *os, uint64_t txg)
1183 1183 {
1184 1184 return (!list_is_empty(&os->os_dirty_dnodes[txg & TXG_MASK]) ||
1185 1185 !list_is_empty(&os->os_free_dnodes[txg & TXG_MASK]));
1186 1186 }
1187 1187
1188 1188 static objset_used_cb_t *used_cbs[DMU_OST_NUMTYPES];
1189 1189
1190 1190 void
1191 1191 dmu_objset_register_type(dmu_objset_type_t ost, objset_used_cb_t *cb)
1192 1192 {
1193 1193 used_cbs[ost] = cb;
1194 1194 }
1195 1195
1196 1196 boolean_t
1197 1197 dmu_objset_userused_enabled(objset_t *os)
1198 1198 {
1199 1199 return (spa_version(os->os_spa) >= SPA_VERSION_USERSPACE &&
1200 1200 used_cbs[os->os_phys->os_type] != NULL &&
1201 1201 DMU_USERUSED_DNODE(os) != NULL);
1202 1202 }
1203 1203
1204 1204 static void
1205 1205 do_userquota_update(objset_t *os, uint64_t used, uint64_t flags,
1206 1206 uint64_t user, uint64_t group, boolean_t subtract, dmu_tx_t *tx)
1207 1207 {
1208 1208 if ((flags & DNODE_FLAG_USERUSED_ACCOUNTED)) {
1209 1209 int64_t delta = DNODE_SIZE + used;
1210 1210 if (subtract)
1211 1211 delta = -delta;
1212 1212 VERIFY3U(0, ==, zap_increment_int(os, DMU_USERUSED_OBJECT,
1213 1213 user, delta, tx));
1214 1214 VERIFY3U(0, ==, zap_increment_int(os, DMU_GROUPUSED_OBJECT,
1215 1215 group, delta, tx));
1216 1216 }
1217 1217 }
1218 1218
1219 1219 void
1220 1220 dmu_objset_do_userquota_updates(objset_t *os, dmu_tx_t *tx)
1221 1221 {
1222 1222 dnode_t *dn;
1223 1223 list_t *list = &os->os_synced_dnodes;
1224 1224
1225 1225 ASSERT(list_head(list) == NULL || dmu_objset_userused_enabled(os));
1226 1226
1227 1227 while (dn = list_head(list)) {
1228 1228 int flags;
1229 1229 ASSERT(!DMU_OBJECT_IS_SPECIAL(dn->dn_object));
1230 1230 ASSERT(dn->dn_phys->dn_type == DMU_OT_NONE ||
1231 1231 dn->dn_phys->dn_flags &
1232 1232 DNODE_FLAG_USERUSED_ACCOUNTED);
1233 1233
1234 1234 /* Allocate the user/groupused objects if necessary. */
1235 1235 if (DMU_USERUSED_DNODE(os)->dn_type == DMU_OT_NONE) {
1236 1236 VERIFY(0 == zap_create_claim(os,
1237 1237 DMU_USERUSED_OBJECT,
1238 1238 DMU_OT_USERGROUP_USED, DMU_OT_NONE, 0, tx));
1239 1239 VERIFY(0 == zap_create_claim(os,
1240 1240 DMU_GROUPUSED_OBJECT,
1241 1241 DMU_OT_USERGROUP_USED, DMU_OT_NONE, 0, tx));
1242 1242 }
1243 1243
1244 1244 /*
1245 1245 * We intentionally modify the zap object even if the
1246 1246 * net delta is zero. Otherwise
1247 1247 * the block of the zap obj could be shared between
1248 1248 * datasets but need to be different between them after
1249 1249 * a bprewrite.
1250 1250 */
1251 1251
1252 1252 flags = dn->dn_id_flags;
1253 1253 ASSERT(flags);
1254 1254 if (flags & DN_ID_OLD_EXIST) {
1255 1255 do_userquota_update(os, dn->dn_oldused, dn->dn_oldflags,
1256 1256 dn->dn_olduid, dn->dn_oldgid, B_TRUE, tx);
1257 1257 }
1258 1258 if (flags & DN_ID_NEW_EXIST) {
1259 1259 do_userquota_update(os, DN_USED_BYTES(dn->dn_phys),
1260 1260 dn->dn_phys->dn_flags, dn->dn_newuid,
1261 1261 dn->dn_newgid, B_FALSE, tx);
1262 1262 }
1263 1263
1264 1264 mutex_enter(&dn->dn_mtx);
1265 1265 dn->dn_oldused = 0;
1266 1266 dn->dn_oldflags = 0;
1267 1267 if (dn->dn_id_flags & DN_ID_NEW_EXIST) {
1268 1268 dn->dn_olduid = dn->dn_newuid;
1269 1269 dn->dn_oldgid = dn->dn_newgid;
1270 1270 dn->dn_id_flags |= DN_ID_OLD_EXIST;
1271 1271 if (dn->dn_bonuslen == 0)
1272 1272 dn->dn_id_flags |= DN_ID_CHKED_SPILL;
1273 1273 else
1274 1274 dn->dn_id_flags |= DN_ID_CHKED_BONUS;
1275 1275 }
1276 1276 dn->dn_id_flags &= ~(DN_ID_NEW_EXIST);
1277 1277 mutex_exit(&dn->dn_mtx);
1278 1278
1279 1279 list_remove(list, dn);
1280 1280 dnode_rele(dn, list);
1281 1281 }
1282 1282 }
1283 1283
1284 1284 /*
1285 1285 * Returns a pointer to data to find uid/gid from
1286 1286 *
1287 1287 * If a dirty record for transaction group that is syncing can't
1288 1288 * be found then NULL is returned. In the NULL case it is assumed
1289 1289 * the uid/gid aren't changing.
1290 1290 */
1291 1291 static void *
1292 1292 dmu_objset_userquota_find_data(dmu_buf_impl_t *db, dmu_tx_t *tx)
1293 1293 {
1294 1294 dbuf_dirty_record_t *dr, **drp;
1295 1295 void *data;
1296 1296
1297 1297 if (db->db_dirtycnt == 0)
1298 1298 return (db->db.db_data); /* Nothing is changing */
1299 1299
1300 1300 for (drp = &db->db_last_dirty; (dr = *drp) != NULL; drp = &dr->dr_next)
1301 1301 if (dr->dr_txg == tx->tx_txg)
1302 1302 break;
1303 1303
1304 1304 if (dr == NULL) {
1305 1305 data = NULL;
1306 1306 } else {
1307 1307 dnode_t *dn;
1308 1308
1309 1309 DB_DNODE_ENTER(dr->dr_dbuf);
1310 1310 dn = DB_DNODE(dr->dr_dbuf);
1311 1311
1312 1312 if (dn->dn_bonuslen == 0 &&
1313 1313 dr->dr_dbuf->db_blkid == DMU_SPILL_BLKID)
1314 1314 data = dr->dt.dl.dr_data->b_data;
1315 1315 else
1316 1316 data = dr->dt.dl.dr_data;
1317 1317
1318 1318 DB_DNODE_EXIT(dr->dr_dbuf);
1319 1319 }
1320 1320
1321 1321 return (data);
1322 1322 }
1323 1323
1324 1324 void
1325 1325 dmu_objset_userquota_get_ids(dnode_t *dn, boolean_t before, dmu_tx_t *tx)
1326 1326 {
1327 1327 objset_t *os = dn->dn_objset;
1328 1328 void *data = NULL;
1329 1329 dmu_buf_impl_t *db = NULL;
1330 1330 uint64_t *user = NULL;
1331 1331 uint64_t *group = NULL;
1332 1332 int flags = dn->dn_id_flags;
1333 1333 int error;
1334 1334 boolean_t have_spill = B_FALSE;
1335 1335
1336 1336 if (!dmu_objset_userused_enabled(dn->dn_objset))
1337 1337 return;
1338 1338
1339 1339 if (before && (flags & (DN_ID_CHKED_BONUS|DN_ID_OLD_EXIST|
1340 1340 DN_ID_CHKED_SPILL)))
1341 1341 return;
1342 1342
1343 1343 if (before && dn->dn_bonuslen != 0)
1344 1344 data = DN_BONUS(dn->dn_phys);
1345 1345 else if (!before && dn->dn_bonuslen != 0) {
1346 1346 if (dn->dn_bonus) {
1347 1347 db = dn->dn_bonus;
1348 1348 mutex_enter(&db->db_mtx);
1349 1349 data = dmu_objset_userquota_find_data(db, tx);
1350 1350 } else {
1351 1351 data = DN_BONUS(dn->dn_phys);
1352 1352 }
1353 1353 } else if (dn->dn_bonuslen == 0 && dn->dn_bonustype == DMU_OT_SA) {
1354 1354 int rf = 0;
1355 1355
1356 1356 if (RW_WRITE_HELD(&dn->dn_struct_rwlock))
1357 1357 rf |= DB_RF_HAVESTRUCT;
1358 1358 error = dmu_spill_hold_by_dnode(dn,
1359 1359 rf | DB_RF_MUST_SUCCEED,
1360 1360 FTAG, (dmu_buf_t **)&db);
1361 1361 ASSERT(error == 0);
1362 1362 mutex_enter(&db->db_mtx);
1363 1363 data = (before) ? db->db.db_data :
1364 1364 dmu_objset_userquota_find_data(db, tx);
1365 1365 have_spill = B_TRUE;
1366 1366 } else {
1367 1367 mutex_enter(&dn->dn_mtx);
1368 1368 dn->dn_id_flags |= DN_ID_CHKED_BONUS;
1369 1369 mutex_exit(&dn->dn_mtx);
1370 1370 return;
1371 1371 }
1372 1372
1373 1373 if (before) {
1374 1374 ASSERT(data);
1375 1375 user = &dn->dn_olduid;
1376 1376 group = &dn->dn_oldgid;
1377 1377 } else if (data) {
1378 1378 user = &dn->dn_newuid;
1379 1379 group = &dn->dn_newgid;
1380 1380 }
1381 1381
1382 1382 /*
1383 1383 * Must always call the callback in case the object
1384 1384 * type has changed and that type isn't an object type to track
1385 1385 */
1386 1386 error = used_cbs[os->os_phys->os_type](dn->dn_bonustype, data,
1387 1387 user, group);
1388 1388
1389 1389 /*
1390 1390 * Preserve existing uid/gid when the callback can't determine
1391 1391 * what the new uid/gid are and the callback returned EEXIST.
1392 1392 * The EEXIST error tells us to just use the existing uid/gid.
1393 1393 * If we don't know what the old values are then just assign
1394 1394 * them to 0, since that is a new file being created.
1395 1395 */
1396 1396 if (!before && data == NULL && error == EEXIST) {
1397 1397 if (flags & DN_ID_OLD_EXIST) {
1398 1398 dn->dn_newuid = dn->dn_olduid;
1399 1399 dn->dn_newgid = dn->dn_oldgid;
1400 1400 } else {
1401 1401 dn->dn_newuid = 0;
1402 1402 dn->dn_newgid = 0;
1403 1403 }
1404 1404 error = 0;
1405 1405 }
1406 1406
1407 1407 if (db)
1408 1408 mutex_exit(&db->db_mtx);
1409 1409
1410 1410 mutex_enter(&dn->dn_mtx);
1411 1411 if (error == 0 && before)
1412 1412 dn->dn_id_flags |= DN_ID_OLD_EXIST;
1413 1413 if (error == 0 && !before)
1414 1414 dn->dn_id_flags |= DN_ID_NEW_EXIST;
1415 1415
1416 1416 if (have_spill) {
1417 1417 dn->dn_id_flags |= DN_ID_CHKED_SPILL;
1418 1418 } else {
1419 1419 dn->dn_id_flags |= DN_ID_CHKED_BONUS;
1420 1420 }
1421 1421 mutex_exit(&dn->dn_mtx);
1422 1422 if (have_spill)
1423 1423 dmu_buf_rele((dmu_buf_t *)db, FTAG);
1424 1424 }
1425 1425
1426 1426 boolean_t
1427 1427 dmu_objset_userspace_present(objset_t *os)
1428 1428 {
1429 1429 return (os->os_phys->os_flags &
1430 1430 OBJSET_FLAG_USERACCOUNTING_COMPLETE);
1431 1431 }
1432 1432
1433 1433 int
1434 1434 dmu_objset_userspace_upgrade(objset_t *os)
1435 1435 {
1436 1436 uint64_t obj;
1437 1437 int err = 0;
1438 1438
1439 1439 if (dmu_objset_userspace_present(os))
1440 1440 return (0);
1441 1441 if (!dmu_objset_userused_enabled(os))
1442 1442 return (SET_ERROR(ENOTSUP));
1443 1443 if (dmu_objset_is_snapshot(os))
1444 1444 return (SET_ERROR(EINVAL));
1445 1445
1446 1446 /*
1447 1447 * We simply need to mark every object dirty, so that it will be
1448 1448 * synced out and now accounted. If this is called
1449 1449 * concurrently, or if we already did some work before crashing,
1450 1450 * that's fine, since we track each object's accounted state
1451 1451 * independently.
1452 1452 */
1453 1453
1454 1454 for (obj = 0; err == 0; err = dmu_object_next(os, &obj, FALSE, 0)) {
1455 1455 dmu_tx_t *tx;
1456 1456 dmu_buf_t *db;
1457 1457 int objerr;
1458 1458
1459 1459 if (issig(JUSTLOOKING) && issig(FORREAL))
1460 1460 return (SET_ERROR(EINTR));
1461 1461
1462 1462 objerr = dmu_bonus_hold(os, obj, FTAG, &db);
1463 1463 if (objerr != 0)
1464 1464 continue;
1465 1465 tx = dmu_tx_create(os);
1466 1466 dmu_tx_hold_bonus(tx, obj);
1467 1467 objerr = dmu_tx_assign(tx, TXG_WAIT);
1468 1468 if (objerr != 0) {
1469 1469 dmu_tx_abort(tx);
1470 1470 continue;
1471 1471 }
1472 1472 dmu_buf_will_dirty(db, tx);
1473 1473 dmu_buf_rele(db, FTAG);
1474 1474 dmu_tx_commit(tx);
1475 1475 }
1476 1476
1477 1477 os->os_flags |= OBJSET_FLAG_USERACCOUNTING_COMPLETE;
1478 1478 txg_wait_synced(dmu_objset_pool(os), 0);
1479 1479 return (0);
1480 1480 }
1481 1481
1482 1482 void
1483 1483 dmu_objset_space(objset_t *os, uint64_t *refdbytesp, uint64_t *availbytesp,
1484 1484 uint64_t *usedobjsp, uint64_t *availobjsp)
1485 1485 {
1486 1486 dsl_dataset_space(os->os_dsl_dataset, refdbytesp, availbytesp,
1487 1487 usedobjsp, availobjsp);
1488 1488 }
1489 1489
1490 1490 uint64_t
1491 1491 dmu_objset_fsid_guid(objset_t *os)
1492 1492 {
1493 1493 return (dsl_dataset_fsid_guid(os->os_dsl_dataset));
1494 1494 }
1495 1495
1496 1496 void
1497 1497 dmu_objset_fast_stat(objset_t *os, dmu_objset_stats_t *stat)
1498 1498 {
1499 1499 stat->dds_type = os->os_phys->os_type;
1500 1500 if (os->os_dsl_dataset)
1501 1501 dsl_dataset_fast_stat(os->os_dsl_dataset, stat);
1502 1502 }
1503 1503
1504 1504 void
1505 1505 dmu_objset_stats(objset_t *os, nvlist_t *nv)
1506 1506 {
1507 1507 ASSERT(os->os_dsl_dataset ||
1508 1508 os->os_phys->os_type == DMU_OST_META);
1509 1509
1510 1510 if (os->os_dsl_dataset != NULL)
1511 1511 dsl_dataset_stats(os->os_dsl_dataset, nv);
1512 1512
1513 1513 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_TYPE,
1514 1514 os->os_phys->os_type);
1515 1515 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERACCOUNTING,
1516 1516 dmu_objset_userspace_present(os));
1517 1517 }
1518 1518
1519 1519 int
1520 1520 dmu_objset_is_snapshot(objset_t *os)
1521 1521 {
1522 1522 if (os->os_dsl_dataset != NULL)
1523 1523 return (os->os_dsl_dataset->ds_is_snapshot);
1524 1524 else
1525 1525 return (B_FALSE);
1526 1526 }
1527 1527
1528 1528 int
1529 1529 dmu_snapshot_realname(objset_t *os, char *name, char *real, int maxlen,
1530 1530 boolean_t *conflict)
1531 1531 {
1532 1532 dsl_dataset_t *ds = os->os_dsl_dataset;
1533 1533 uint64_t ignored;
1534 1534
1535 1535 if (dsl_dataset_phys(ds)->ds_snapnames_zapobj == 0)
1536 1536 return (SET_ERROR(ENOENT));
1537 1537
1538 1538 return (zap_lookup_norm(ds->ds_dir->dd_pool->dp_meta_objset,
1539 1539 dsl_dataset_phys(ds)->ds_snapnames_zapobj, name, 8, 1, &ignored,
1540 1540 MT_FIRST, real, maxlen, conflict));
1541 1541 }
1542 1542
1543 1543 int
1544 1544 dmu_snapshot_list_next(objset_t *os, int namelen, char *name,
1545 1545 uint64_t *idp, uint64_t *offp, boolean_t *case_conflict)
1546 1546 {
1547 1547 dsl_dataset_t *ds = os->os_dsl_dataset;
1548 1548 zap_cursor_t cursor;
1549 1549 zap_attribute_t attr;
1550 1550
1551 1551 ASSERT(dsl_pool_config_held(dmu_objset_pool(os)));
1552 1552
1553 1553 if (dsl_dataset_phys(ds)->ds_snapnames_zapobj == 0)
1554 1554 return (SET_ERROR(ENOENT));
1555 1555
1556 1556 zap_cursor_init_serialized(&cursor,
1557 1557 ds->ds_dir->dd_pool->dp_meta_objset,
1558 1558 dsl_dataset_phys(ds)->ds_snapnames_zapobj, *offp);
1559 1559
1560 1560 if (zap_cursor_retrieve(&cursor, &attr) != 0) {
1561 1561 zap_cursor_fini(&cursor);
1562 1562 return (SET_ERROR(ENOENT));
1563 1563 }
1564 1564
1565 1565 if (strlen(attr.za_name) + 1 > namelen) {
1566 1566 zap_cursor_fini(&cursor);
1567 1567 return (SET_ERROR(ENAMETOOLONG));
1568 1568 }
1569 1569
1570 1570 (void) strcpy(name, attr.za_name);
1571 1571 if (idp)
1572 1572 *idp = attr.za_first_integer;
1573 1573 if (case_conflict)
1574 1574 *case_conflict = attr.za_normalization_conflict;
1575 1575 zap_cursor_advance(&cursor);
1576 1576 *offp = zap_cursor_serialize(&cursor);
1577 1577 zap_cursor_fini(&cursor);
1578 1578
1579 1579 return (0);
1580 1580 }
1581 1581
1582 1582 int
1583 1583 dmu_dir_list_next(objset_t *os, int namelen, char *name,
1584 1584 uint64_t *idp, uint64_t *offp)
1585 1585 {
1586 1586 dsl_dir_t *dd = os->os_dsl_dataset->ds_dir;
1587 1587 zap_cursor_t cursor;
1588 1588 zap_attribute_t attr;
1589 1589
1590 1590 /* there is no next dir on a snapshot! */
1591 1591 if (os->os_dsl_dataset->ds_object !=
1592 1592 dsl_dir_phys(dd)->dd_head_dataset_obj)
1593 1593 return (SET_ERROR(ENOENT));
1594 1594
1595 1595 zap_cursor_init_serialized(&cursor,
1596 1596 dd->dd_pool->dp_meta_objset,
1597 1597 dsl_dir_phys(dd)->dd_child_dir_zapobj, *offp);
1598 1598
1599 1599 if (zap_cursor_retrieve(&cursor, &attr) != 0) {
1600 1600 zap_cursor_fini(&cursor);
1601 1601 return (SET_ERROR(ENOENT));
1602 1602 }
1603 1603
1604 1604 if (strlen(attr.za_name) + 1 > namelen) {
1605 1605 zap_cursor_fini(&cursor);
1606 1606 return (SET_ERROR(ENAMETOOLONG));
1607 1607 }
1608 1608
1609 1609 (void) strcpy(name, attr.za_name);
1610 1610 if (idp)
1611 1611 *idp = attr.za_first_integer;
1612 1612 zap_cursor_advance(&cursor);
1613 1613 *offp = zap_cursor_serialize(&cursor);
1614 1614 zap_cursor_fini(&cursor);
1615 1615
1616 1616 return (0);
1617 1617 }
1618 1618
1619 1619 typedef struct dmu_objset_find_ctx {
1620 1620 taskq_t *dc_tq;
1621 1621 dsl_pool_t *dc_dp;
1622 1622 uint64_t dc_ddobj;
1623 1623 int (*dc_func)(dsl_pool_t *, dsl_dataset_t *, void *);
1624 1624 void *dc_arg;
1625 1625 int dc_flags;
1626 1626 kmutex_t *dc_error_lock;
1627 1627 int *dc_error;
1628 1628 } dmu_objset_find_ctx_t;
1629 1629
1630 1630 static void
1631 1631 dmu_objset_find_dp_impl(dmu_objset_find_ctx_t *dcp)
1632 1632 {
1633 1633 dsl_pool_t *dp = dcp->dc_dp;
1634 1634 dmu_objset_find_ctx_t *child_dcp;
1635 1635 dsl_dir_t *dd;
1636 1636 dsl_dataset_t *ds;
1637 1637 zap_cursor_t zc;
1638 1638 zap_attribute_t *attr;
1639 1639 uint64_t thisobj;
1640 1640 int err = 0;
1641 1641
1642 1642 /* don't process if there already was an error */
1643 1643 if (*dcp->dc_error != 0)
1644 1644 goto out;
1645 1645
1646 1646 err = dsl_dir_hold_obj(dp, dcp->dc_ddobj, NULL, FTAG, &dd);
1647 1647 if (err != 0)
1648 1648 goto out;
1649 1649
1650 1650 /* Don't visit hidden ($MOS & $ORIGIN) objsets. */
1651 1651 if (dd->dd_myname[0] == '$') {
1652 1652 dsl_dir_rele(dd, FTAG);
1653 1653 goto out;
1654 1654 }
1655 1655
1656 1656 thisobj = dsl_dir_phys(dd)->dd_head_dataset_obj;
1657 1657 attr = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP);
1658 1658
1659 1659 /*
1660 1660 * Iterate over all children.
1661 1661 */
1662 1662 if (dcp->dc_flags & DS_FIND_CHILDREN) {
1663 1663 for (zap_cursor_init(&zc, dp->dp_meta_objset,
1664 1664 dsl_dir_phys(dd)->dd_child_dir_zapobj);
1665 1665 zap_cursor_retrieve(&zc, attr) == 0;
1666 1666 (void) zap_cursor_advance(&zc)) {
1667 1667 ASSERT3U(attr->za_integer_length, ==,
1668 1668 sizeof (uint64_t));
1669 1669 ASSERT3U(attr->za_num_integers, ==, 1);
1670 1670
1671 1671 child_dcp = kmem_alloc(sizeof(*child_dcp), KM_SLEEP);
1672 1672 *child_dcp = *dcp;
1673 1673 child_dcp->dc_ddobj = attr->za_first_integer;
1674 1674 if (dcp->dc_tq != NULL)
1675 1675 (void) taskq_dispatch(dcp->dc_tq,
1676 1676 dmu_objset_find_dp_cb, child_dcp, TQ_SLEEP);
1677 1677 else
1678 1678 dmu_objset_find_dp_impl(child_dcp);
1679 1679 }
1680 1680 zap_cursor_fini(&zc);
1681 1681 }
1682 1682
1683 1683 /*
1684 1684 * Iterate over all snapshots.
1685 1685 */
1686 1686 if (dcp->dc_flags & DS_FIND_SNAPSHOTS) {
1687 1687 dsl_dataset_t *ds;
1688 1688 err = dsl_dataset_hold_obj(dp, thisobj, FTAG, &ds);
1689 1689
1690 1690 if (err == 0) {
1691 1691 uint64_t snapobj;
1692 1692
1693 1693 snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj;
1694 1694 dsl_dataset_rele(ds, FTAG);
1695 1695
1696 1696 for (zap_cursor_init(&zc, dp->dp_meta_objset, snapobj);
1697 1697 zap_cursor_retrieve(&zc, attr) == 0;
1698 1698 (void) zap_cursor_advance(&zc)) {
1699 1699 ASSERT3U(attr->za_integer_length, ==,
1700 1700 sizeof (uint64_t));
1701 1701 ASSERT3U(attr->za_num_integers, ==, 1);
1702 1702
1703 1703 err = dsl_dataset_hold_obj(dp,
1704 1704 attr->za_first_integer, FTAG, &ds);
1705 1705 if (err != 0)
1706 1706 break;
1707 1707 err = dcp->dc_func(dp, ds, dcp->dc_arg);
1708 1708 dsl_dataset_rele(ds, FTAG);
1709 1709 if (err != 0)
1710 1710 break;
1711 1711 }
1712 1712 zap_cursor_fini(&zc);
1713 1713 }
1714 1714 }
1715 1715
1716 1716 dsl_dir_rele(dd, FTAG);
1717 1717 kmem_free(attr, sizeof (zap_attribute_t));
1718 1718
1719 1719 if (err != 0)
1720 1720 goto out;
1721 1721
1722 1722 /*
1723 1723 * Apply to self.
1724 1724 */
1725 1725 err = dsl_dataset_hold_obj(dp, thisobj, FTAG, &ds);
1726 1726 if (err != 0)
1727 1727 goto out;
1728 1728 err = dcp->dc_func(dp, ds, dcp->dc_arg);
1729 1729 dsl_dataset_rele(ds, FTAG);
1730 1730
1731 1731 out:
1732 1732 if (err != 0) {
1733 1733 mutex_enter(dcp->dc_error_lock);
1734 1734 /* only keep first error */
1735 1735 if (*dcp->dc_error == 0)
1736 1736 *dcp->dc_error = err;
1737 1737 mutex_exit(dcp->dc_error_lock);
1738 1738 }
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1739 1739
1740 1740 kmem_free(dcp, sizeof(*dcp));
1741 1741 }
1742 1742
1743 1743 static void
1744 1744 dmu_objset_find_dp_cb(void *arg)
1745 1745 {
1746 1746 dmu_objset_find_ctx_t *dcp = arg;
1747 1747 dsl_pool_t *dp = dcp->dc_dp;
1748 1748
1749 - dsl_pool_config_enter(dp, FTAG);
1749 + /*
1750 + * We need to get a pool_config_lock here, as there are several
1751 + * asssert(pool_config_held) down the stack. Getting a lock via
1752 + * dsl_pool_config_enter is risky, as it might be stalled by a
1753 + * pending writer. This would deadlock, as the write lock can
1754 + * only be granted when our parent thread gives up the lock.
1755 + * The _prio interface gives us priority over a pending writer.
1756 + * On the other hand, we don't risk to stall any pending writers,
1757 + * as the parent thread already holds a config lock. We give up
1758 + * our lock before the parent does, so in effect we do not prolong
1759 + * the waiting time for the writer.
1760 + */
1761 + dsl_pool_config_enter_prio(dp, FTAG);
1750 1762
1751 1763 dmu_objset_find_dp_impl(dcp);
1752 1764
1753 1765 dsl_pool_config_exit(dp, FTAG);
1754 1766 }
1755 1767
1756 1768 /*
1757 1769 * Find objsets under and including ddobj, call func(ds) on each.
1758 1770 * The order for the enumeration is completely undefined.
1759 1771 * func is called with dsl_pool_config held.
1760 1772 */
1761 1773 int
1762 1774 dmu_objset_find_dp(dsl_pool_t *dp, uint64_t ddobj,
1763 1775 int func(dsl_pool_t *, dsl_dataset_t *, void *), void *arg, int flags)
1764 1776 {
1765 1777 int error = 0;
1766 1778 taskq_t *tq = NULL;
1767 1779 int ntasks;
1768 1780 dmu_objset_find_ctx_t *dcp;
1769 1781 kmutex_t err_lock;
1770 1782
1771 1783 mutex_init(&err_lock, NULL, MUTEX_DEFAULT, NULL);
1772 1784 dcp = kmem_alloc(sizeof(*dcp), KM_SLEEP);
1773 1785 dcp->dc_tq = NULL;
1774 1786 dcp->dc_dp = dp;
1775 1787 dcp->dc_ddobj = ddobj;
1776 1788 dcp->dc_func = func;
1777 1789 dcp->dc_arg = arg;
1778 1790 dcp->dc_flags = flags;
1779 1791 dcp->dc_error_lock = &err_lock;
1780 1792 dcp->dc_error = &error;
1781 1793
1782 1794 if ((flags & DS_FIND_SERIALIZE) || dsl_pool_config_held_writer(dp)) {
1783 1795 /*
1784 1796 * In case a write lock is held we can't make use of
1785 1797 * parallelism, as down the stack of the worker threads
1786 1798 * the lock is asserted via dsl_pool_config_held.
1787 1799 * In case of a read lock this is solved by getting a read
1788 1800 * lock in each worker thread, which isn't possible in case
1789 1801 * of a writer lock. So we fall back to the synchronous path
1790 1802 * here.
1791 1803 * In the future it might be possible to get some magic into
1792 1804 * dsl_pool_config_held in a way that it returns true for
1793 1805 * the worker threads so that a single lock held from this
1794 1806 * thread suffices. For now, stay single threaded.
1795 1807 */
1796 1808 dmu_objset_find_dp_impl(dcp);
1797 1809
1798 1810 return (error);
1799 1811 }
1800 1812
1801 1813 ntasks = dmu_find_threads;
1802 1814 if (ntasks == 0)
1803 1815 ntasks = vdev_count_leaves(dp->dp_spa) * 4;
1804 1816 tq = taskq_create("dmu_objset_find", ntasks, minclsyspri, ntasks,
1805 1817 INT_MAX, 0);
1806 1818 if (tq == NULL) {
1807 1819 kmem_free(dcp, sizeof(*dcp));
1808 1820 return (SET_ERROR(ENOMEM));
1809 1821 }
1810 1822 dcp->dc_tq = tq;
1811 1823
1812 1824 /* dcp will be freed by task */
1813 1825 (void) taskq_dispatch(tq, dmu_objset_find_dp_cb, dcp, TQ_SLEEP);
1814 1826
1815 1827 /*
1816 1828 * PORTING: this code relies on the property of taskq_wait to wait
1817 1829 * until no more tasks are queued and no more tasks are active. As
1818 1830 * we always queue new tasks from within other tasks, task_wait
1819 1831 * reliably waits for the full recursion to finish, even though we
1820 1832 * enqueue new tasks after taskq_wait has been called.
1821 1833 * On platforms other than illumos, taskq_wait may not have this
1822 1834 * property.
1823 1835 */
1824 1836 taskq_wait(tq);
1825 1837 taskq_destroy(tq);
1826 1838 mutex_destroy(&err_lock);
1827 1839
1828 1840 return (error);
1829 1841 }
1830 1842
1831 1843 /*
1832 1844 * Find all objsets under name, and for each, call 'func(child_name, arg)'.
1833 1845 * The dp_config_rwlock must not be held when this is called, and it
1834 1846 * will not be held when the callback is called.
1835 1847 * Therefore this function should only be used when the pool is not changing
1836 1848 * (e.g. in syncing context), or the callback can deal with the possible races.
1837 1849 */
1838 1850 static int
1839 1851 dmu_objset_find_impl(spa_t *spa, const char *name,
1840 1852 int func(const char *, void *), void *arg, int flags)
1841 1853 {
1842 1854 dsl_dir_t *dd;
1843 1855 dsl_pool_t *dp = spa_get_dsl(spa);
1844 1856 dsl_dataset_t *ds;
1845 1857 zap_cursor_t zc;
1846 1858 zap_attribute_t *attr;
1847 1859 char *child;
1848 1860 uint64_t thisobj;
1849 1861 int err;
1850 1862
1851 1863 dsl_pool_config_enter(dp, FTAG);
1852 1864
1853 1865 err = dsl_dir_hold(dp, name, FTAG, &dd, NULL);
1854 1866 if (err != 0) {
1855 1867 dsl_pool_config_exit(dp, FTAG);
1856 1868 return (err);
1857 1869 }
1858 1870
1859 1871 /* Don't visit hidden ($MOS & $ORIGIN) objsets. */
1860 1872 if (dd->dd_myname[0] == '$') {
1861 1873 dsl_dir_rele(dd, FTAG);
1862 1874 dsl_pool_config_exit(dp, FTAG);
1863 1875 return (0);
1864 1876 }
1865 1877
1866 1878 thisobj = dsl_dir_phys(dd)->dd_head_dataset_obj;
1867 1879 attr = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP);
1868 1880
1869 1881 /*
1870 1882 * Iterate over all children.
1871 1883 */
1872 1884 if (flags & DS_FIND_CHILDREN) {
1873 1885 for (zap_cursor_init(&zc, dp->dp_meta_objset,
1874 1886 dsl_dir_phys(dd)->dd_child_dir_zapobj);
1875 1887 zap_cursor_retrieve(&zc, attr) == 0;
1876 1888 (void) zap_cursor_advance(&zc)) {
1877 1889 ASSERT3U(attr->za_integer_length, ==,
1878 1890 sizeof (uint64_t));
1879 1891 ASSERT3U(attr->za_num_integers, ==, 1);
1880 1892
1881 1893 child = kmem_asprintf("%s/%s", name, attr->za_name);
1882 1894 dsl_pool_config_exit(dp, FTAG);
1883 1895 err = dmu_objset_find_impl(spa, child,
1884 1896 func, arg, flags);
1885 1897 dsl_pool_config_enter(dp, FTAG);
1886 1898 strfree(child);
1887 1899 if (err != 0)
1888 1900 break;
1889 1901 }
1890 1902 zap_cursor_fini(&zc);
1891 1903
1892 1904 if (err != 0) {
1893 1905 dsl_dir_rele(dd, FTAG);
1894 1906 dsl_pool_config_exit(dp, FTAG);
1895 1907 kmem_free(attr, sizeof (zap_attribute_t));
1896 1908 return (err);
1897 1909 }
1898 1910 }
1899 1911
1900 1912 /*
1901 1913 * Iterate over all snapshots.
1902 1914 */
1903 1915 if (flags & DS_FIND_SNAPSHOTS) {
1904 1916 err = dsl_dataset_hold_obj(dp, thisobj, FTAG, &ds);
1905 1917
1906 1918 if (err == 0) {
1907 1919 uint64_t snapobj;
1908 1920
1909 1921 snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj;
1910 1922 dsl_dataset_rele(ds, FTAG);
1911 1923
1912 1924 for (zap_cursor_init(&zc, dp->dp_meta_objset, snapobj);
1913 1925 zap_cursor_retrieve(&zc, attr) == 0;
1914 1926 (void) zap_cursor_advance(&zc)) {
1915 1927 ASSERT3U(attr->za_integer_length, ==,
1916 1928 sizeof (uint64_t));
1917 1929 ASSERT3U(attr->za_num_integers, ==, 1);
1918 1930
1919 1931 child = kmem_asprintf("%s@%s",
1920 1932 name, attr->za_name);
1921 1933 dsl_pool_config_exit(dp, FTAG);
1922 1934 err = func(child, arg);
1923 1935 dsl_pool_config_enter(dp, FTAG);
1924 1936 strfree(child);
1925 1937 if (err != 0)
1926 1938 break;
1927 1939 }
1928 1940 zap_cursor_fini(&zc);
1929 1941 }
1930 1942 }
1931 1943
1932 1944 dsl_dir_rele(dd, FTAG);
1933 1945 kmem_free(attr, sizeof (zap_attribute_t));
1934 1946 dsl_pool_config_exit(dp, FTAG);
1935 1947
1936 1948 if (err != 0)
1937 1949 return (err);
1938 1950
1939 1951 /* Apply to self. */
1940 1952 return (func(name, arg));
1941 1953 }
1942 1954
1943 1955 /*
1944 1956 * See comment above dmu_objset_find_impl().
1945 1957 */
1946 1958 int
1947 1959 dmu_objset_find(char *name, int func(const char *, void *), void *arg,
1948 1960 int flags)
1949 1961 {
1950 1962 spa_t *spa;
1951 1963 int error;
1952 1964
1953 1965 error = spa_open(name, &spa, FTAG);
1954 1966 if (error != 0)
1955 1967 return (error);
1956 1968 error = dmu_objset_find_impl(spa, name, func, arg, flags);
1957 1969 spa_close(spa, FTAG);
1958 1970 return (error);
1959 1971 }
1960 1972
1961 1973 void
1962 1974 dmu_objset_set_user(objset_t *os, void *user_ptr)
1963 1975 {
1964 1976 ASSERT(MUTEX_HELD(&os->os_user_ptr_lock));
1965 1977 os->os_user_ptr = user_ptr;
1966 1978 }
1967 1979
1968 1980 void *
1969 1981 dmu_objset_get_user(objset_t *os)
1970 1982 {
1971 1983 ASSERT(MUTEX_HELD(&os->os_user_ptr_lock));
1972 1984 return (os->os_user_ptr);
1973 1985 }
1974 1986
1975 1987 /*
1976 1988 * Determine name of filesystem, given name of snapshot.
1977 1989 * buf must be at least MAXNAMELEN bytes
1978 1990 */
1979 1991 int
1980 1992 dmu_fsname(const char *snapname, char *buf)
1981 1993 {
1982 1994 char *atp = strchr(snapname, '@');
1983 1995 if (atp == NULL)
1984 1996 return (SET_ERROR(EINVAL));
1985 1997 if (atp - snapname >= MAXNAMELEN)
1986 1998 return (SET_ERROR(ENAMETOOLONG));
1987 1999 (void) strlcpy(buf, snapname, atp - snapname + 1);
1988 2000 return (0);
1989 2001 }
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