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