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6267 dn_bonus evicted too early
[unleashed.git] / usr / src / uts / common / fs / zfs / dmu_objset.c
blob79de1d127d426fe3c546a03e4a5d0e533b7672e6
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 boolean_t needlock = B_FALSE;
366
367 /*
368 * Note: it's valid to open the objset if the dataset is
369 * long-held, in which case the pool_config lock will not
370 * be held.
371 */
372 if (!dsl_pool_config_held(dmu_objset_pool(os))) {
373 needlock = B_TRUE;
374 dsl_pool_config_enter(dmu_objset_pool(os), FTAG);
375 }
376 err = dsl_prop_register(ds,
377 zfs_prop_to_name(ZFS_PROP_PRIMARYCACHE),
378 primary_cache_changed_cb, os);
379 if (err == 0) {
380 err = dsl_prop_register(ds,
381 zfs_prop_to_name(ZFS_PROP_SECONDARYCACHE),
382 secondary_cache_changed_cb, os);
383 }
384 if (!ds->ds_is_snapshot) {
385 if (err == 0) {
386 err = dsl_prop_register(ds,
387 zfs_prop_to_name(ZFS_PROP_CHECKSUM),
388 checksum_changed_cb, os);
389 }
390 if (err == 0) {
391 err = dsl_prop_register(ds,
392 zfs_prop_to_name(ZFS_PROP_COMPRESSION),
393 compression_changed_cb, os);
394 }
395 if (err == 0) {
396 err = dsl_prop_register(ds,
397 zfs_prop_to_name(ZFS_PROP_COPIES),
398 copies_changed_cb, os);
399 }
400 if (err == 0) {
401 err = dsl_prop_register(ds,
402 zfs_prop_to_name(ZFS_PROP_DEDUP),
403 dedup_changed_cb, os);
404 }
405 if (err == 0) {
406 err = dsl_prop_register(ds,
407 zfs_prop_to_name(ZFS_PROP_LOGBIAS),
408 logbias_changed_cb, os);
409 }
410 if (err == 0) {
411 err = dsl_prop_register(ds,
412 zfs_prop_to_name(ZFS_PROP_SYNC),
413 sync_changed_cb, os);
414 }
415 if (err == 0) {
416 err = dsl_prop_register(ds,
417 zfs_prop_to_name(
418 ZFS_PROP_REDUNDANT_METADATA),
419 redundant_metadata_changed_cb, os);
420 }
421 if (err == 0) {
422 err = dsl_prop_register(ds,
423 zfs_prop_to_name(ZFS_PROP_RECORDSIZE),
424 recordsize_changed_cb, os);
425 }
426 }
427 if (needlock)
428 dsl_pool_config_exit(dmu_objset_pool(os), FTAG);
429 if (err != 0) {
430 VERIFY(arc_buf_remove_ref(os->os_phys_buf,
431 &os->os_phys_buf));
432 kmem_free(os, sizeof (objset_t));
433 return (err);
434 }
435 } else {
436 /* It's the meta-objset. */
437 os->os_checksum = ZIO_CHECKSUM_FLETCHER_4;
438 os->os_compress = ZIO_COMPRESS_ON;
439 os->os_copies = spa_max_replication(spa);
440 os->os_dedup_checksum = ZIO_CHECKSUM_OFF;
441 os->os_dedup_verify = B_FALSE;
442 os->os_logbias = ZFS_LOGBIAS_LATENCY;
443 os->os_sync = ZFS_SYNC_STANDARD;
444 os->os_primary_cache = ZFS_CACHE_ALL;
445 os->os_secondary_cache = ZFS_CACHE_ALL;
446 }
447
448 if (ds == NULL || !ds->ds_is_snapshot)
449 os->os_zil_header = os->os_phys->os_zil_header;
450 os->os_zil = zil_alloc(os, &os->os_zil_header);
451
452 for (i = 0; i < TXG_SIZE; i++) {
453 list_create(&os->os_dirty_dnodes[i], sizeof (dnode_t),
454 offsetof(dnode_t, dn_dirty_link[i]));
455 list_create(&os->os_free_dnodes[i], sizeof (dnode_t),
456 offsetof(dnode_t, dn_dirty_link[i]));
457 }
458 list_create(&os->os_dnodes, sizeof (dnode_t),
459 offsetof(dnode_t, dn_link));
460 list_create(&os->os_downgraded_dbufs, sizeof (dmu_buf_impl_t),
461 offsetof(dmu_buf_impl_t, db_link));
462
463 mutex_init(&os->os_lock, NULL, MUTEX_DEFAULT, NULL);
464 mutex_init(&os->os_obj_lock, NULL, MUTEX_DEFAULT, NULL);
465 mutex_init(&os->os_user_ptr_lock, NULL, MUTEX_DEFAULT, NULL);
466
467 dnode_special_open(os, &os->os_phys->os_meta_dnode,
468 DMU_META_DNODE_OBJECT, &os->os_meta_dnode);
469 if (arc_buf_size(os->os_phys_buf) >= sizeof (objset_phys_t)) {
470 dnode_special_open(os, &os->os_phys->os_userused_dnode,
471 DMU_USERUSED_OBJECT, &os->os_userused_dnode);
472 dnode_special_open(os, &os->os_phys->os_groupused_dnode,
473 DMU_GROUPUSED_OBJECT, &os->os_groupused_dnode);
474 }
475
476 *osp = os;
477 return (0);
478 }
479
480 int
481 dmu_objset_from_ds(dsl_dataset_t *ds, objset_t **osp)
482 {
483 int err = 0;
484
485 /*
486 * We shouldn't be doing anything with dsl_dataset_t's unless the
487 * pool_config lock is held, or the dataset is long-held.
488 */
489 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool) ||
490 dsl_dataset_long_held(ds));
491
492 mutex_enter(&ds->ds_opening_lock);
493 if (ds->ds_objset == NULL) {
494 objset_t *os;
495 err = dmu_objset_open_impl(dsl_dataset_get_spa(ds),
496 ds, dsl_dataset_get_blkptr(ds), &os);
497
498 if (err == 0) {
499 mutex_enter(&ds->ds_lock);
500 ASSERT(ds->ds_objset == NULL);
501 ds->ds_objset = os;
502 mutex_exit(&ds->ds_lock);
503 }
504 }
505 *osp = ds->ds_objset;
506 mutex_exit(&ds->ds_opening_lock);
507 return (err);
508 }
509
510 /*
511 * Holds the pool while the objset is held. Therefore only one objset
512 * can be held at a time.
513 */
514 int
515 dmu_objset_hold(const char *name, void *tag, objset_t **osp)
516 {
517 dsl_pool_t *dp;
518 dsl_dataset_t *ds;
519 int err;
520
521 err = dsl_pool_hold(name, tag, &dp);
522 if (err != 0)
523 return (err);
524 err = dsl_dataset_hold(dp, name, tag, &ds);
525 if (err != 0) {
526 dsl_pool_rele(dp, tag);
527 return (err);
528 }
529
530 err = dmu_objset_from_ds(ds, osp);
531 if (err != 0) {
532 dsl_dataset_rele(ds, tag);
533 dsl_pool_rele(dp, tag);
534 }
535
536 return (err);
537 }
538
539 static int
540 dmu_objset_own_impl(dsl_dataset_t *ds, dmu_objset_type_t type,
541 boolean_t readonly, void *tag, objset_t **osp)
542 {
543 int err;
544
545 err = dmu_objset_from_ds(ds, osp);
546 if (err != 0) {
547 dsl_dataset_disown(ds, tag);
548 } else if (type != DMU_OST_ANY && type != (*osp)->os_phys->os_type) {
549 dsl_dataset_disown(ds, tag);
550 return (SET_ERROR(EINVAL));
551 } else if (!readonly && dsl_dataset_is_snapshot(ds)) {
552 dsl_dataset_disown(ds, tag);
553 return (SET_ERROR(EROFS));
554 }
555 return (err);
556 }
557
558 /*
559 * dsl_pool must not be held when this is called.
560 * Upon successful return, there will be a longhold on the dataset,
561 * and the dsl_pool will not be held.
562 */
563 int
564 dmu_objset_own(const char *name, dmu_objset_type_t type,
565 boolean_t readonly, void *tag, objset_t **osp)
566 {
567 dsl_pool_t *dp;
568 dsl_dataset_t *ds;
569 int err;
570
571 err = dsl_pool_hold(name, FTAG, &dp);
572 if (err != 0)
573 return (err);
574 err = dsl_dataset_own(dp, name, tag, &ds);
575 if (err != 0) {
576 dsl_pool_rele(dp, FTAG);
577 return (err);
578 }
579 err = dmu_objset_own_impl(ds, type, readonly, tag, osp);
580 dsl_pool_rele(dp, FTAG);
581
582 return (err);
583 }
584
585 int
586 dmu_objset_own_obj(dsl_pool_t *dp, uint64_t obj, dmu_objset_type_t type,
587 boolean_t readonly, void *tag, objset_t **osp)
588 {
589 dsl_dataset_t *ds;
590 int err;
591
592 err = dsl_dataset_own_obj(dp, obj, tag, &ds);
593 if (err != 0)
594 return (err);
595
596 return (dmu_objset_own_impl(ds, type, readonly, tag, osp));
597 }
598
599 void
600 dmu_objset_rele(objset_t *os, void *tag)
601 {
602 dsl_pool_t *dp = dmu_objset_pool(os);
603 dsl_dataset_rele(os->os_dsl_dataset, tag);
604 dsl_pool_rele(dp, tag);
605 }
606
607 /*
608 * When we are called, os MUST refer to an objset associated with a dataset
609 * that is owned by 'tag'; that is, is held and long held by 'tag' and ds_owner
610 * == tag. We will then release and reacquire ownership of the dataset while
611 * holding the pool config_rwlock to avoid intervening namespace or ownership
612 * changes may occur.
613 *
614 * This exists solely to accommodate zfs_ioc_userspace_upgrade()'s desire to
615 * release the hold on its dataset and acquire a new one on the dataset of the
616 * same name so that it can be partially torn down and reconstructed.
617 */
618 void
619 dmu_objset_refresh_ownership(objset_t *os, void *tag)
620 {
621 dsl_pool_t *dp;
622 dsl_dataset_t *ds, *newds;
623 char name[MAXNAMELEN];
624
625 ds = os->os_dsl_dataset;
626 VERIFY3P(ds, !=, NULL);
627 VERIFY3P(ds->ds_owner, ==, tag);
628 VERIFY(dsl_dataset_long_held(ds));
629
630 dsl_dataset_name(ds, name);
631 dp = dmu_objset_pool(os);
632 dsl_pool_config_enter(dp, FTAG);
633 dmu_objset_disown(os, tag);
634 VERIFY0(dsl_dataset_own(dp, name, tag, &newds));
635 VERIFY3P(newds, ==, os->os_dsl_dataset);
636 dsl_pool_config_exit(dp, FTAG);
637 }
638
639 void
640 dmu_objset_disown(objset_t *os, void *tag)
641 {
642 dsl_dataset_disown(os->os_dsl_dataset, tag);
643 }
644
645 void
646 dmu_objset_evict_dbufs(objset_t *os)
647 {
648 dnode_t dn_marker;
649 dnode_t *dn;
650
651 mutex_enter(&os->os_lock);
652 dn = list_head(&os->os_dnodes);
653 while (dn != NULL) {
654 /*
655 * Skip dnodes without holds. We have to do this dance
656 * because dnode_add_ref() only works if there is already a
657 * hold. If the dnode has no holds, then it has no dbufs.
658 */
659 if (dnode_add_ref(dn, FTAG)) {
660 list_insert_after(&os->os_dnodes, dn, &dn_marker);
661 mutex_exit(&os->os_lock);
662
663 dnode_evict_dbufs(dn);
664 dnode_rele(dn, FTAG);
665
666 mutex_enter(&os->os_lock);
667 dn = list_next(&os->os_dnodes, &dn_marker);
668 list_remove(&os->os_dnodes, &dn_marker);
669 } else {
670 dn = list_next(&os->os_dnodes, dn);
671 }
672 }
673 mutex_exit(&os->os_lock);
674
675 if (DMU_USERUSED_DNODE(os) != NULL) {
676 dnode_evict_dbufs(DMU_GROUPUSED_DNODE(os));
677 dnode_evict_dbufs(DMU_USERUSED_DNODE(os));
678 }
679 dnode_evict_dbufs(DMU_META_DNODE(os));
680 }
681
682 /*
683 * Objset eviction processing is split into into two pieces.
684 * The first marks the objset as evicting, evicts any dbufs that
685 * have a refcount of zero, and then queues up the objset for the
686 * second phase of eviction. Once os->os_dnodes has been cleared by
687 * dnode_buf_pageout()->dnode_destroy(), the second phase is executed.
688 * The second phase closes the special dnodes, dequeues the objset from
689 * the list of those undergoing eviction, and finally frees the objset.
690 *
691 * NOTE: Due to asynchronous eviction processing (invocation of
692 * dnode_buf_pageout()), it is possible for the meta dnode for the
693 * objset to have no holds even though os->os_dnodes is not empty.
694 */
695 void
696 dmu_objset_evict(objset_t *os)
697 {
698 dsl_dataset_t *ds = os->os_dsl_dataset;
699
700 for (int t = 0; t < TXG_SIZE; t++)
701 ASSERT(!dmu_objset_is_dirty(os, t));
702
703 if (ds)
704 dsl_prop_unregister_all(ds, os);
705
706 if (os->os_sa)
707 sa_tear_down(os);
708
709 dmu_objset_evict_dbufs(os);
710
711 mutex_enter(&os->os_lock);
712 spa_evicting_os_register(os->os_spa, os);
713 if (list_is_empty(&os->os_dnodes)) {
714 mutex_exit(&os->os_lock);
715 dmu_objset_evict_done(os);
716 } else {
717 mutex_exit(&os->os_lock);
718 }
719 }
720
721 void
722 dmu_objset_evict_done(objset_t *os)
723 {
724 ASSERT3P(list_head(&os->os_dnodes), ==, NULL);
725
726 dnode_special_close(&os->os_meta_dnode);
727 if (DMU_USERUSED_DNODE(os)) {
728 dnode_special_close(&os->os_userused_dnode);
729 dnode_special_close(&os->os_groupused_dnode);
730 }
731 zil_free(os->os_zil);
732
733 VERIFY(arc_buf_remove_ref(os->os_phys_buf, &os->os_phys_buf));
734
735 /*
736 * This is a barrier to prevent the objset from going away in
737 * dnode_move() until we can safely ensure that the objset is still in
738 * use. We consider the objset valid before the barrier and invalid
739 * after the barrier.
740 */
741 rw_enter(&os_lock, RW_READER);
742 rw_exit(&os_lock);
743
744 mutex_destroy(&os->os_lock);
745 mutex_destroy(&os->os_obj_lock);
746 mutex_destroy(&os->os_user_ptr_lock);
747 spa_evicting_os_deregister(os->os_spa, os);
748 kmem_free(os, sizeof (objset_t));
749 }
750
751 timestruc_t
752 dmu_objset_snap_cmtime(objset_t *os)
753 {
754 return (dsl_dir_snap_cmtime(os->os_dsl_dataset->ds_dir));
755 }
756
757 /* called from dsl for meta-objset */
758 objset_t *
759 dmu_objset_create_impl(spa_t *spa, dsl_dataset_t *ds, blkptr_t *bp,
760 dmu_objset_type_t type, dmu_tx_t *tx)
761 {
762 objset_t *os;
763 dnode_t *mdn;
764
765 ASSERT(dmu_tx_is_syncing(tx));
766
767 if (ds != NULL)
768 VERIFY0(dmu_objset_from_ds(ds, &os));
769 else
770 VERIFY0(dmu_objset_open_impl(spa, NULL, bp, &os));
771
772 mdn = DMU_META_DNODE(os);
773
774 dnode_allocate(mdn, DMU_OT_DNODE, 1 << DNODE_BLOCK_SHIFT,
775 DN_MAX_INDBLKSHIFT, DMU_OT_NONE, 0, tx);
776
777 /*
778 * We don't want to have to increase the meta-dnode's nlevels
779 * later, because then we could do it in quescing context while
780 * we are also accessing it in open context.
781 *
782 * This precaution is not necessary for the MOS (ds == NULL),
783 * because the MOS is only updated in syncing context.
784 * This is most fortunate: the MOS is the only objset that
785 * needs to be synced multiple times as spa_sync() iterates
786 * to convergence, so minimizing its dn_nlevels matters.
787 */
788 if (ds != NULL) {
789 int levels = 1;
790
791 /*
792 * Determine the number of levels necessary for the meta-dnode
793 * to contain DN_MAX_OBJECT dnodes.
794 */
795 while ((uint64_t)mdn->dn_nblkptr << (mdn->dn_datablkshift +
796 (levels - 1) * (mdn->dn_indblkshift - SPA_BLKPTRSHIFT)) <
797 DN_MAX_OBJECT * sizeof (dnode_phys_t))
798 levels++;
799
800 mdn->dn_next_nlevels[tx->tx_txg & TXG_MASK] =
801 mdn->dn_nlevels = levels;
802 }
803
804 ASSERT(type != DMU_OST_NONE);
805 ASSERT(type != DMU_OST_ANY);
806 ASSERT(type < DMU_OST_NUMTYPES);
807 os->os_phys->os_type = type;
808 if (dmu_objset_userused_enabled(os)) {
809 os->os_phys->os_flags |= OBJSET_FLAG_USERACCOUNTING_COMPLETE;
810 os->os_flags = os->os_phys->os_flags;
811 }
812
813 dsl_dataset_dirty(ds, tx);
814
815 return (os);
816 }
817
818 typedef struct dmu_objset_create_arg {
819 const char *doca_name;
820 cred_t *doca_cred;
821 void (*doca_userfunc)(objset_t *os, void *arg,
822 cred_t *cr, dmu_tx_t *tx);
823 void *doca_userarg;
824 dmu_objset_type_t doca_type;
825 uint64_t doca_flags;
826 } dmu_objset_create_arg_t;
827
828 /*ARGSUSED*/
829 static int
830 dmu_objset_create_check(void *arg, dmu_tx_t *tx)
831 {
832 dmu_objset_create_arg_t *doca = arg;
833 dsl_pool_t *dp = dmu_tx_pool(tx);
834 dsl_dir_t *pdd;
835 const char *tail;
836 int error;
837
838 if (strchr(doca->doca_name, '@') != NULL)
839 return (SET_ERROR(EINVAL));
840
841 error = dsl_dir_hold(dp, doca->doca_name, FTAG, &pdd, &tail);
842 if (error != 0)
843 return (error);
844 if (tail == NULL) {
845 dsl_dir_rele(pdd, FTAG);
846 return (SET_ERROR(EEXIST));
847 }
848 error = dsl_fs_ss_limit_check(pdd, 1, ZFS_PROP_FILESYSTEM_LIMIT, NULL,
849 doca->doca_cred);
850 dsl_dir_rele(pdd, FTAG);
851
852 return (error);
853 }
854
855 static void
856 dmu_objset_create_sync(void *arg, dmu_tx_t *tx)
857 {
858 dmu_objset_create_arg_t *doca = arg;
859 dsl_pool_t *dp = dmu_tx_pool(tx);
860 dsl_dir_t *pdd;
861 const char *tail;
862 dsl_dataset_t *ds;
863 uint64_t obj;
864 blkptr_t *bp;
865 objset_t *os;
866
867 VERIFY0(dsl_dir_hold(dp, doca->doca_name, FTAG, &pdd, &tail));
868
869 obj = dsl_dataset_create_sync(pdd, tail, NULL, doca->doca_flags,
870 doca->doca_cred, tx);
871
872 VERIFY0(dsl_dataset_hold_obj(pdd->dd_pool, obj, FTAG, &ds));
873 bp = dsl_dataset_get_blkptr(ds);
874 os = dmu_objset_create_impl(pdd->dd_pool->dp_spa,
875 ds, bp, doca->doca_type, tx);
876
877 if (doca->doca_userfunc != NULL) {
878 doca->doca_userfunc(os, doca->doca_userarg,
879 doca->doca_cred, tx);
880 }
881
882 spa_history_log_internal_ds(ds, "create", tx, "");
883 dsl_dataset_rele(ds, FTAG);
884 dsl_dir_rele(pdd, FTAG);
885 }
886
887 int
888 dmu_objset_create(const char *name, dmu_objset_type_t type, uint64_t flags,
889 void (*func)(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx), void *arg)
890 {
891 dmu_objset_create_arg_t doca;
892
893 doca.doca_name = name;
894 doca.doca_cred = CRED();
895 doca.doca_flags = flags;
896 doca.doca_userfunc = func;
897 doca.doca_userarg = arg;
898 doca.doca_type = type;
899
900 return (dsl_sync_task(name,
901 dmu_objset_create_check, dmu_objset_create_sync, &doca,
902 5, ZFS_SPACE_CHECK_NORMAL));
903 }
904
905 typedef struct dmu_objset_clone_arg {
906 const char *doca_clone;
907 const char *doca_origin;
908 cred_t *doca_cred;
909 } dmu_objset_clone_arg_t;
910
911 /*ARGSUSED*/
912 static int
913 dmu_objset_clone_check(void *arg, dmu_tx_t *tx)
914 {
915 dmu_objset_clone_arg_t *doca = arg;
916 dsl_dir_t *pdd;
917 const char *tail;
918 int error;
919 dsl_dataset_t *origin;
920 dsl_pool_t *dp = dmu_tx_pool(tx);
921
922 if (strchr(doca->doca_clone, '@') != NULL)
923 return (SET_ERROR(EINVAL));
924
925 error = dsl_dir_hold(dp, doca->doca_clone, FTAG, &pdd, &tail);
926 if (error != 0)
927 return (error);
928 if (tail == NULL) {
929 dsl_dir_rele(pdd, FTAG);
930 return (SET_ERROR(EEXIST));
931 }
932
933 error = dsl_fs_ss_limit_check(pdd, 1, ZFS_PROP_FILESYSTEM_LIMIT, NULL,
934 doca->doca_cred);
935 if (error != 0) {
936 dsl_dir_rele(pdd, FTAG);
937 return (SET_ERROR(EDQUOT));
938 }
939 dsl_dir_rele(pdd, FTAG);
940
941 error = dsl_dataset_hold(dp, doca->doca_origin, FTAG, &origin);
942 if (error != 0)
943 return (error);
944
945 /* You can only clone snapshots, not the head datasets. */
946 if (!origin->ds_is_snapshot) {
947 dsl_dataset_rele(origin, FTAG);
948 return (SET_ERROR(EINVAL));
949 }
950 dsl_dataset_rele(origin, FTAG);
951
952 return (0);
953 }
954
955 static void
956 dmu_objset_clone_sync(void *arg, dmu_tx_t *tx)
957 {
958 dmu_objset_clone_arg_t *doca = arg;
959 dsl_pool_t *dp = dmu_tx_pool(tx);
960 dsl_dir_t *pdd;
961 const char *tail;
962 dsl_dataset_t *origin, *ds;
963 uint64_t obj;
964 char namebuf[MAXNAMELEN];
965
966 VERIFY0(dsl_dir_hold(dp, doca->doca_clone, FTAG, &pdd, &tail));
967 VERIFY0(dsl_dataset_hold(dp, doca->doca_origin, FTAG, &origin));
968
969 obj = dsl_dataset_create_sync(pdd, tail, origin, 0,
970 doca->doca_cred, tx);
971
972 VERIFY0(dsl_dataset_hold_obj(pdd->dd_pool, obj, FTAG, &ds));
973 dsl_dataset_name(origin, namebuf);
974 spa_history_log_internal_ds(ds, "clone", tx,
975 "origin=%s (%llu)", namebuf, origin->ds_object);
976 dsl_dataset_rele(ds, FTAG);
977 dsl_dataset_rele(origin, FTAG);
978 dsl_dir_rele(pdd, FTAG);
979 }
980
981 int
982 dmu_objset_clone(const char *clone, const char *origin)
983 {
984 dmu_objset_clone_arg_t doca;
985
986 doca.doca_clone = clone;
987 doca.doca_origin = origin;
988 doca.doca_cred = CRED();
989
990 return (dsl_sync_task(clone,
991 dmu_objset_clone_check, dmu_objset_clone_sync, &doca,
992 5, ZFS_SPACE_CHECK_NORMAL));
993 }
994
995 int
996 dmu_objset_snapshot_one(const char *fsname, const char *snapname)
997 {
998 int err;
999 char *longsnap = kmem_asprintf("%s@%s", fsname, snapname);
1000 nvlist_t *snaps = fnvlist_alloc();
1001
1002 fnvlist_add_boolean(snaps, longsnap);
1003 strfree(longsnap);
1004 err = dsl_dataset_snapshot(snaps, NULL, NULL);
1005 fnvlist_free(snaps);
1006 return (err);
1007 }
1008
1009 static void
1010 dmu_objset_sync_dnodes(list_t *list, list_t *newlist, dmu_tx_t *tx)
1011 {
1012 dnode_t *dn;
1013
1014 while (dn = list_head(list)) {
1015 ASSERT(dn->dn_object != DMU_META_DNODE_OBJECT);
1016 ASSERT(dn->dn_dbuf->db_data_pending);
1017 /*
1018 * Initialize dn_zio outside dnode_sync() because the
1019 * meta-dnode needs to set it ouside dnode_sync().
1020 */
1021 dn->dn_zio = dn->dn_dbuf->db_data_pending->dr_zio;
1022 ASSERT(dn->dn_zio);
1023
1024 ASSERT3U(dn->dn_nlevels, <=, DN_MAX_LEVELS);
1025 list_remove(list, dn);
1026
1027 if (newlist) {
1028 (void) dnode_add_ref(dn, newlist);
1029 list_insert_tail(newlist, dn);
1030 }
1031
1032 dnode_sync(dn, tx);
1033 }
1034 }
1035
1036 /* ARGSUSED */
1037 static void
1038 dmu_objset_write_ready(zio_t *zio, arc_buf_t *abuf, void *arg)
1039 {
1040 blkptr_t *bp = zio->io_bp;
1041 objset_t *os = arg;
1042 dnode_phys_t *dnp = &os->os_phys->os_meta_dnode;
1043
1044 ASSERT(!BP_IS_EMBEDDED(bp));
1045 ASSERT3P(bp, ==, os->os_rootbp);
1046 ASSERT3U(BP_GET_TYPE(bp), ==, DMU_OT_OBJSET);
1047 ASSERT0(BP_GET_LEVEL(bp));
1048
1049 /*
1050 * Update rootbp fill count: it should be the number of objects
1051 * allocated in the object set (not counting the "special"
1052 * objects that are stored in the objset_phys_t -- the meta
1053 * dnode and user/group accounting objects).
1054 */
1055 bp->blk_fill = 0;
1056 for (int i = 0; i < dnp->dn_nblkptr; i++)
1057 bp->blk_fill += BP_GET_FILL(&dnp->dn_blkptr[i]);
1058 }
1059
1060 /* ARGSUSED */
1061 static void
1062 dmu_objset_write_done(zio_t *zio, arc_buf_t *abuf, void *arg)
1063 {
1064 blkptr_t *bp = zio->io_bp;
1065 blkptr_t *bp_orig = &zio->io_bp_orig;
1066 objset_t *os = arg;
1067
1068 if (zio->io_flags & ZIO_FLAG_IO_REWRITE) {
1069 ASSERT(BP_EQUAL(bp, bp_orig));
1070 } else {
1071 dsl_dataset_t *ds = os->os_dsl_dataset;
1072 dmu_tx_t *tx = os->os_synctx;
1073
1074 (void) dsl_dataset_block_kill(ds, bp_orig, tx, B_TRUE);
1075 dsl_dataset_block_born(ds, bp, tx);
1076 }
1077 }
1078
1079 /* called from dsl */
1080 void
1081 dmu_objset_sync(objset_t *os, zio_t *pio, dmu_tx_t *tx)
1082 {
1083 int txgoff;
1084 zbookmark_phys_t zb;
1085 zio_prop_t zp;
1086 zio_t *zio;
1087 list_t *list;
1088 list_t *newlist = NULL;
1089 dbuf_dirty_record_t *dr;
1090
1091 dprintf_ds(os->os_dsl_dataset, "txg=%llu\n", tx->tx_txg);
1092
1093 ASSERT(dmu_tx_is_syncing(tx));
1094 /* XXX the write_done callback should really give us the tx... */
1095 os->os_synctx = tx;
1096
1097 if (os->os_dsl_dataset == NULL) {
1098 /*
1099 * This is the MOS. If we have upgraded,
1100 * spa_max_replication() could change, so reset
1101 * os_copies here.
1102 */
1103 os->os_copies = spa_max_replication(os->os_spa);
1104 }
1105
1106 /*
1107 * Create the root block IO
1108 */
1109 SET_BOOKMARK(&zb, os->os_dsl_dataset ?
1110 os->os_dsl_dataset->ds_object : DMU_META_OBJSET,
1111 ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID);
1112 arc_release(os->os_phys_buf, &os->os_phys_buf);
1113
1114 dmu_write_policy(os, NULL, 0, 0, &zp);
1115
1116 zio = arc_write(pio, os->os_spa, tx->tx_txg,
1117 os->os_rootbp, os->os_phys_buf, DMU_OS_IS_L2CACHEABLE(os),
1118 DMU_OS_IS_L2COMPRESSIBLE(os), &zp, dmu_objset_write_ready,
1119 NULL, dmu_objset_write_done, os, ZIO_PRIORITY_ASYNC_WRITE,
1120 ZIO_FLAG_MUSTSUCCEED, &zb);
1121
1122 /*
1123 * Sync special dnodes - the parent IO for the sync is the root block
1124 */
1125 DMU_META_DNODE(os)->dn_zio = zio;
1126 dnode_sync(DMU_META_DNODE(os), tx);
1127
1128 os->os_phys->os_flags = os->os_flags;
1129
1130 if (DMU_USERUSED_DNODE(os) &&
1131 DMU_USERUSED_DNODE(os)->dn_type != DMU_OT_NONE) {
1132 DMU_USERUSED_DNODE(os)->dn_zio = zio;
1133 dnode_sync(DMU_USERUSED_DNODE(os), tx);
1134 DMU_GROUPUSED_DNODE(os)->dn_zio = zio;
1135 dnode_sync(DMU_GROUPUSED_DNODE(os), tx);
1136 }
1137
1138 txgoff = tx->tx_txg & TXG_MASK;
1139
1140 if (dmu_objset_userused_enabled(os)) {
1141 newlist = &os->os_synced_dnodes;
1142 /*
1143 * We must create the list here because it uses the
1144 * dn_dirty_link[] of this txg.
1145 */
1146 list_create(newlist, sizeof (dnode_t),
1147 offsetof(dnode_t, dn_dirty_link[txgoff]));
1148 }
1149
1150 dmu_objset_sync_dnodes(&os->os_free_dnodes[txgoff], newlist, tx);
1151 dmu_objset_sync_dnodes(&os->os_dirty_dnodes[txgoff], newlist, tx);
1152
1153 list = &DMU_META_DNODE(os)->dn_dirty_records[txgoff];
1154 while (dr = list_head(list)) {
1155 ASSERT0(dr->dr_dbuf->db_level);
1156 list_remove(list, dr);
1157 if (dr->dr_zio)
1158 zio_nowait(dr->dr_zio);
1159 }
1160 /*
1161 * Free intent log blocks up to this tx.
1162 */
1163 zil_sync(os->os_zil, tx);
1164 os->os_phys->os_zil_header = os->os_zil_header;
1165 zio_nowait(zio);
1166 }
1167
1168 boolean_t
1169 dmu_objset_is_dirty(objset_t *os, uint64_t txg)
1170 {
1171 return (!list_is_empty(&os->os_dirty_dnodes[txg & TXG_MASK]) ||
1172 !list_is_empty(&os->os_free_dnodes[txg & TXG_MASK]));
1173 }
1174
1175 static objset_used_cb_t *used_cbs[DMU_OST_NUMTYPES];
1176
1177 void
1178 dmu_objset_register_type(dmu_objset_type_t ost, objset_used_cb_t *cb)
1179 {
1180 used_cbs[ost] = cb;
1181 }
1182
1183 boolean_t
1184 dmu_objset_userused_enabled(objset_t *os)
1185 {
1186 return (spa_version(os->os_spa) >= SPA_VERSION_USERSPACE &&
1187 used_cbs[os->os_phys->os_type] != NULL &&
1188 DMU_USERUSED_DNODE(os) != NULL);
1189 }
1190
1191 static void
1192 do_userquota_update(objset_t *os, uint64_t used, uint64_t flags,
1193 uint64_t user, uint64_t group, boolean_t subtract, dmu_tx_t *tx)
1194 {
1195 if ((flags & DNODE_FLAG_USERUSED_ACCOUNTED)) {
1196 int64_t delta = DNODE_SIZE + used;
1197 if (subtract)
1198 delta = -delta;
1199 VERIFY3U(0, ==, zap_increment_int(os, DMU_USERUSED_OBJECT,
1200 user, delta, tx));
1201 VERIFY3U(0, ==, zap_increment_int(os, DMU_GROUPUSED_OBJECT,
1202 group, delta, tx));
1203 }
1204 }
1205
1206 void
1207 dmu_objset_do_userquota_updates(objset_t *os, dmu_tx_t *tx)
1208 {
1209 dnode_t *dn;
1210 list_t *list = &os->os_synced_dnodes;
1211
1212 ASSERT(list_head(list) == NULL || dmu_objset_userused_enabled(os));
1213
1214 while (dn = list_head(list)) {
1215 int flags;
1216 ASSERT(!DMU_OBJECT_IS_SPECIAL(dn->dn_object));
1217 ASSERT(dn->dn_phys->dn_type == DMU_OT_NONE ||
1218 dn->dn_phys->dn_flags &
1219 DNODE_FLAG_USERUSED_ACCOUNTED);
1220
1221 /* Allocate the user/groupused objects if necessary. */
1222 if (DMU_USERUSED_DNODE(os)->dn_type == DMU_OT_NONE) {
1223 VERIFY(0 == zap_create_claim(os,
1224 DMU_USERUSED_OBJECT,
1225 DMU_OT_USERGROUP_USED, DMU_OT_NONE, 0, tx));
1226 VERIFY(0 == zap_create_claim(os,
1227 DMU_GROUPUSED_OBJECT,
1228 DMU_OT_USERGROUP_USED, DMU_OT_NONE, 0, tx));
1229 }
1230
1231 /*
1232 * We intentionally modify the zap object even if the
1233 * net delta is zero. Otherwise
1234 * the block of the zap obj could be shared between
1235 * datasets but need to be different between them after
1236 * a bprewrite.
1237 */
1238
1239 flags = dn->dn_id_flags;
1240 ASSERT(flags);
1241 if (flags & DN_ID_OLD_EXIST) {
1242 do_userquota_update(os, dn->dn_oldused, dn->dn_oldflags,
1243 dn->dn_olduid, dn->dn_oldgid, B_TRUE, tx);
1244 }
1245 if (flags & DN_ID_NEW_EXIST) {
1246 do_userquota_update(os, DN_USED_BYTES(dn->dn_phys),
1247 dn->dn_phys->dn_flags, dn->dn_newuid,
1248 dn->dn_newgid, B_FALSE, tx);
1249 }
1250
1251 mutex_enter(&dn->dn_mtx);
1252 dn->dn_oldused = 0;
1253 dn->dn_oldflags = 0;
1254 if (dn->dn_id_flags & DN_ID_NEW_EXIST) {
1255 dn->dn_olduid = dn->dn_newuid;
1256 dn->dn_oldgid = dn->dn_newgid;
1257 dn->dn_id_flags |= DN_ID_OLD_EXIST;
1258 if (dn->dn_bonuslen == 0)
1259 dn->dn_id_flags |= DN_ID_CHKED_SPILL;
1260 else
1261 dn->dn_id_flags |= DN_ID_CHKED_BONUS;
1262 }
1263 dn->dn_id_flags &= ~(DN_ID_NEW_EXIST);
1264 mutex_exit(&dn->dn_mtx);
1265
1266 list_remove(list, dn);
1267 dnode_rele(dn, list);
1268 }
1269 }
1270
1271 /*
1272 * Returns a pointer to data to find uid/gid from
1273 *
1274 * If a dirty record for transaction group that is syncing can't
1275 * be found then NULL is returned. In the NULL case it is assumed
1276 * the uid/gid aren't changing.
1277 */
1278 static void *
1279 dmu_objset_userquota_find_data(dmu_buf_impl_t *db, dmu_tx_t *tx)
1280 {
1281 dbuf_dirty_record_t *dr, **drp;
1282 void *data;
1283
1284 if (db->db_dirtycnt == 0)
1285 return (db->db.db_data); /* Nothing is changing */
1286
1287 for (drp = &db->db_last_dirty; (dr = *drp) != NULL; drp = &dr->dr_next)
1288 if (dr->dr_txg == tx->tx_txg)
1289 break;
1290
1291 if (dr == NULL) {
1292 data = NULL;
1293 } else {
1294 dnode_t *dn;
1295
1296 DB_DNODE_ENTER(dr->dr_dbuf);
1297 dn = DB_DNODE(dr->dr_dbuf);
1298
1299 if (dn->dn_bonuslen == 0 &&
1300 dr->dr_dbuf->db_blkid == DMU_SPILL_BLKID)
1301 data = dr->dt.dl.dr_data->b_data;
1302 else
1303 data = dr->dt.dl.dr_data;
1304
1305 DB_DNODE_EXIT(dr->dr_dbuf);
1306 }
1307
1308 return (data);
1309 }
1310
1311 void
1312 dmu_objset_userquota_get_ids(dnode_t *dn, boolean_t before, dmu_tx_t *tx)
1313 {
1314 objset_t *os = dn->dn_objset;
1315 void *data = NULL;
1316 dmu_buf_impl_t *db = NULL;
1317 uint64_t *user = NULL;
1318 uint64_t *group = NULL;
1319 int flags = dn->dn_id_flags;
1320 int error;
1321 boolean_t have_spill = B_FALSE;
1322
1323 if (!dmu_objset_userused_enabled(dn->dn_objset))
1324 return;
1325
1326 if (before && (flags & (DN_ID_CHKED_BONUS|DN_ID_OLD_EXIST|
1327 DN_ID_CHKED_SPILL)))
1328 return;
1329
1330 if (before && dn->dn_bonuslen != 0)
1331 data = DN_BONUS(dn->dn_phys);
1332 else if (!before && dn->dn_bonuslen != 0) {
1333 if (dn->dn_bonus) {
1334 db = dn->dn_bonus;
1335 mutex_enter(&db->db_mtx);
1336 data = dmu_objset_userquota_find_data(db, tx);
1337 } else {
1338 data = DN_BONUS(dn->dn_phys);
1339 }
1340 } else if (dn->dn_bonuslen == 0 && dn->dn_bonustype == DMU_OT_SA) {
1341 int rf = 0;
1342
1343 if (RW_WRITE_HELD(&dn->dn_struct_rwlock))
1344 rf |= DB_RF_HAVESTRUCT;
1345 error = dmu_spill_hold_by_dnode(dn,
1346 rf | DB_RF_MUST_SUCCEED,
1347 FTAG, (dmu_buf_t **)&db);
1348 ASSERT(error == 0);
1349 mutex_enter(&db->db_mtx);
1350 data = (before) ? db->db.db_data :
1351 dmu_objset_userquota_find_data(db, tx);
1352 have_spill = B_TRUE;
1353 } else {
1354 mutex_enter(&dn->dn_mtx);
1355 dn->dn_id_flags |= DN_ID_CHKED_BONUS;
1356 mutex_exit(&dn->dn_mtx);
1357 return;
1358 }
1359
1360 if (before) {
1361 ASSERT(data);
1362 user = &dn->dn_olduid;
1363 group = &dn->dn_oldgid;
1364 } else if (data) {
1365 user = &dn->dn_newuid;
1366 group = &dn->dn_newgid;
1367 }
1368
1369 /*
1370 * Must always call the callback in case the object
1371 * type has changed and that type isn't an object type to track
1372 */
1373 error = used_cbs[os->os_phys->os_type](dn->dn_bonustype, data,
1374 user, group);
1375
1376 /*
1377 * Preserve existing uid/gid when the callback can't determine
1378 * what the new uid/gid are and the callback returned EEXIST.
1379 * The EEXIST error tells us to just use the existing uid/gid.
1380 * If we don't know what the old values are then just assign
1381 * them to 0, since that is a new file being created.
1382 */
1383 if (!before && data == NULL && error == EEXIST) {
1384 if (flags & DN_ID_OLD_EXIST) {
1385 dn->dn_newuid = dn->dn_olduid;
1386 dn->dn_newgid = dn->dn_oldgid;
1387 } else {
1388 dn->dn_newuid = 0;
1389 dn->dn_newgid = 0;
1390 }
1391 error = 0;
1392 }
1393
1394 if (db)
1395 mutex_exit(&db->db_mtx);
1396
1397 mutex_enter(&dn->dn_mtx);
1398 if (error == 0 && before)
1399 dn->dn_id_flags |= DN_ID_OLD_EXIST;
1400 if (error == 0 && !before)
1401 dn->dn_id_flags |= DN_ID_NEW_EXIST;
1402
1403 if (have_spill) {
1404 dn->dn_id_flags |= DN_ID_CHKED_SPILL;
1405 } else {
1406 dn->dn_id_flags |= DN_ID_CHKED_BONUS;
1407 }
1408 mutex_exit(&dn->dn_mtx);
1409 if (have_spill)
1410 dmu_buf_rele((dmu_buf_t *)db, FTAG);
1411 }
1412
1413 boolean_t
1414 dmu_objset_userspace_present(objset_t *os)
1415 {
1416 return (os->os_phys->os_flags &
1417 OBJSET_FLAG_USERACCOUNTING_COMPLETE);
1418 }
1419
1420 int
1421 dmu_objset_userspace_upgrade(objset_t *os)
1422 {
1423 uint64_t obj;
1424 int err = 0;
1425
1426 if (dmu_objset_userspace_present(os))
1427 return (0);
1428 if (!dmu_objset_userused_enabled(os))
1429 return (SET_ERROR(ENOTSUP));
1430 if (dmu_objset_is_snapshot(os))
1431 return (SET_ERROR(EINVAL));
1432
1433 /*
1434 * We simply need to mark every object dirty, so that it will be
1435 * synced out and now accounted. If this is called
1436 * concurrently, or if we already did some work before crashing,
1437 * that's fine, since we track each object's accounted state
1438 * independently.
1439 */
1440
1441 for (obj = 0; err == 0; err = dmu_object_next(os, &obj, FALSE, 0)) {
1442 dmu_tx_t *tx;
1443 dmu_buf_t *db;
1444 int objerr;
1445
1446 if (issig(JUSTLOOKING) && issig(FORREAL))
1447 return (SET_ERROR(EINTR));
1448
1449 objerr = dmu_bonus_hold(os, obj, FTAG, &db);
1450 if (objerr != 0)
1451 continue;
1452 tx = dmu_tx_create(os);
1453 dmu_tx_hold_bonus(tx, obj);
1454 objerr = dmu_tx_assign(tx, TXG_WAIT);
1455 if (objerr != 0) {
1456 dmu_tx_abort(tx);
1457 continue;
1458 }
1459 dmu_buf_will_dirty(db, tx);
1460 dmu_buf_rele(db, FTAG);
1461 dmu_tx_commit(tx);
1462 }
1463
1464 os->os_flags |= OBJSET_FLAG_USERACCOUNTING_COMPLETE;
1465 txg_wait_synced(dmu_objset_pool(os), 0);
1466 return (0);
1467 }
1468
1469 void
1470 dmu_objset_space(objset_t *os, uint64_t *refdbytesp, uint64_t *availbytesp,
1471 uint64_t *usedobjsp, uint64_t *availobjsp)
1472 {
1473 dsl_dataset_space(os->os_dsl_dataset, refdbytesp, availbytesp,
1474 usedobjsp, availobjsp);
1475 }
1476
1477 uint64_t
1478 dmu_objset_fsid_guid(objset_t *os)
1479 {
1480 return (dsl_dataset_fsid_guid(os->os_dsl_dataset));
1481 }
1482
1483 void
1484 dmu_objset_fast_stat(objset_t *os, dmu_objset_stats_t *stat)
1485 {
1486 stat->dds_type = os->os_phys->os_type;
1487 if (os->os_dsl_dataset)
1488 dsl_dataset_fast_stat(os->os_dsl_dataset, stat);
1489 }
1490
1491 void
1492 dmu_objset_stats(objset_t *os, nvlist_t *nv)
1493 {
1494 ASSERT(os->os_dsl_dataset ||
1495 os->os_phys->os_type == DMU_OST_META);
1496
1497 if (os->os_dsl_dataset != NULL)
1498 dsl_dataset_stats(os->os_dsl_dataset, nv);
1499
1500 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_TYPE,
1501 os->os_phys->os_type);
1502 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERACCOUNTING,
1503 dmu_objset_userspace_present(os));
1504 }
1505
1506 int
1507 dmu_objset_is_snapshot(objset_t *os)
1508 {
1509 if (os->os_dsl_dataset != NULL)
1510 return (os->os_dsl_dataset->ds_is_snapshot);
1511 else
1512 return (B_FALSE);
1513 }
1514
1515 int
1516 dmu_snapshot_realname(objset_t *os, char *name, char *real, int maxlen,
1517 boolean_t *conflict)
1518 {
1519 dsl_dataset_t *ds = os->os_dsl_dataset;
1520 uint64_t ignored;
1521
1522 if (dsl_dataset_phys(ds)->ds_snapnames_zapobj == 0)
1523 return (SET_ERROR(ENOENT));
1524
1525 return (zap_lookup_norm(ds->ds_dir->dd_pool->dp_meta_objset,
1526 dsl_dataset_phys(ds)->ds_snapnames_zapobj, name, 8, 1, &ignored,
1527 MT_FIRST, real, maxlen, conflict));
1528 }
1529
1530 int
1531 dmu_snapshot_list_next(objset_t *os, int namelen, char *name,
1532 uint64_t *idp, uint64_t *offp, boolean_t *case_conflict)
1533 {
1534 dsl_dataset_t *ds = os->os_dsl_dataset;
1535 zap_cursor_t cursor;
1536 zap_attribute_t attr;
1537
1538 ASSERT(dsl_pool_config_held(dmu_objset_pool(os)));
1539
1540 if (dsl_dataset_phys(ds)->ds_snapnames_zapobj == 0)
1541 return (SET_ERROR(ENOENT));
1542
1543 zap_cursor_init_serialized(&cursor,
1544 ds->ds_dir->dd_pool->dp_meta_objset,
1545 dsl_dataset_phys(ds)->ds_snapnames_zapobj, *offp);
1546
1547 if (zap_cursor_retrieve(&cursor, &attr) != 0) {
1548 zap_cursor_fini(&cursor);
1549 return (SET_ERROR(ENOENT));
1550 }
1551
1552 if (strlen(attr.za_name) + 1 > namelen) {
1553 zap_cursor_fini(&cursor);
1554 return (SET_ERROR(ENAMETOOLONG));
1555 }
1556
1557 (void) strcpy(name, attr.za_name);
1558 if (idp)
1559 *idp = attr.za_first_integer;
1560 if (case_conflict)
1561 *case_conflict = attr.za_normalization_conflict;
1562 zap_cursor_advance(&cursor);
1563 *offp = zap_cursor_serialize(&cursor);
1564 zap_cursor_fini(&cursor);
1565
1566 return (0);
1567 }
1568
1569 int
1570 dmu_dir_list_next(objset_t *os, int namelen, char *name,
1571 uint64_t *idp, uint64_t *offp)
1572 {
1573 dsl_dir_t *dd = os->os_dsl_dataset->ds_dir;
1574 zap_cursor_t cursor;
1575 zap_attribute_t attr;
1576
1577 /* there is no next dir on a snapshot! */
1578 if (os->os_dsl_dataset->ds_object !=
1579 dsl_dir_phys(dd)->dd_head_dataset_obj)
1580 return (SET_ERROR(ENOENT));
1581
1582 zap_cursor_init_serialized(&cursor,
1583 dd->dd_pool->dp_meta_objset,
1584 dsl_dir_phys(dd)->dd_child_dir_zapobj, *offp);
1585
1586 if (zap_cursor_retrieve(&cursor, &attr) != 0) {
1587 zap_cursor_fini(&cursor);
1588 return (SET_ERROR(ENOENT));
1589 }
1590
1591 if (strlen(attr.za_name) + 1 > namelen) {
1592 zap_cursor_fini(&cursor);
1593 return (SET_ERROR(ENAMETOOLONG));
1594 }
1595
1596 (void) strcpy(name, attr.za_name);
1597 if (idp)
1598 *idp = attr.za_first_integer;
1599 zap_cursor_advance(&cursor);
1600 *offp = zap_cursor_serialize(&cursor);
1601 zap_cursor_fini(&cursor);
1602
1603 return (0);
1604 }
1605
1606 typedef struct dmu_objset_find_ctx {
1607 taskq_t *dc_tq;
1608 dsl_pool_t *dc_dp;
1609 uint64_t dc_ddobj;
1610 int (*dc_func)(dsl_pool_t *, dsl_dataset_t *, void *);
1611 void *dc_arg;
1612 int dc_flags;
1613 kmutex_t *dc_error_lock;
1614 int *dc_error;
1615 } dmu_objset_find_ctx_t;
1616
1617 static void
1618 dmu_objset_find_dp_impl(dmu_objset_find_ctx_t *dcp)
1619 {
1620 dsl_pool_t *dp = dcp->dc_dp;
1621 dmu_objset_find_ctx_t *child_dcp;
1622 dsl_dir_t *dd;
1623 dsl_dataset_t *ds;
1624 zap_cursor_t zc;
1625 zap_attribute_t *attr;
1626 uint64_t thisobj;
1627 int err = 0;
1628
1629 /* don't process if there already was an error */
1630 if (*dcp->dc_error != 0)
1631 goto out;
1632
1633 err = dsl_dir_hold_obj(dp, dcp->dc_ddobj, NULL, FTAG, &dd);
1634 if (err != 0)
1635 goto out;
1636
1637 /* Don't visit hidden ($MOS & $ORIGIN) objsets. */
1638 if (dd->dd_myname[0] == '$') {
1639 dsl_dir_rele(dd, FTAG);
1640 goto out;
1641 }
1642
1643 thisobj = dsl_dir_phys(dd)->dd_head_dataset_obj;
1644 attr = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP);
1645
1646 /*
1647 * Iterate over all children.
1648 */
1649 if (dcp->dc_flags & DS_FIND_CHILDREN) {
1650 for (zap_cursor_init(&zc, dp->dp_meta_objset,
1651 dsl_dir_phys(dd)->dd_child_dir_zapobj);
1652 zap_cursor_retrieve(&zc, attr) == 0;
1653 (void) zap_cursor_advance(&zc)) {
1654 ASSERT3U(attr->za_integer_length, ==,
1655 sizeof (uint64_t));
1656 ASSERT3U(attr->za_num_integers, ==, 1);
1657
1658 child_dcp = kmem_alloc(sizeof (*child_dcp), KM_SLEEP);
1659 *child_dcp = *dcp;
1660 child_dcp->dc_ddobj = attr->za_first_integer;
1661 if (dcp->dc_tq != NULL)
1662 (void) taskq_dispatch(dcp->dc_tq,
1663 dmu_objset_find_dp_cb, child_dcp, TQ_SLEEP);
1664 else
1665 dmu_objset_find_dp_impl(child_dcp);
1666 }
1667 zap_cursor_fini(&zc);
1668 }
1669
1670 /*
1671 * Iterate over all snapshots.
1672 */
1673 if (dcp->dc_flags & DS_FIND_SNAPSHOTS) {
1674 dsl_dataset_t *ds;
1675 err = dsl_dataset_hold_obj(dp, thisobj, FTAG, &ds);
1676
1677 if (err == 0) {
1678 uint64_t snapobj;
1679
1680 snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj;
1681 dsl_dataset_rele(ds, FTAG);
1682
1683 for (zap_cursor_init(&zc, dp->dp_meta_objset, snapobj);
1684 zap_cursor_retrieve(&zc, attr) == 0;
1685 (void) zap_cursor_advance(&zc)) {
1686 ASSERT3U(attr->za_integer_length, ==,
1687 sizeof (uint64_t));
1688 ASSERT3U(attr->za_num_integers, ==, 1);
1689
1690 err = dsl_dataset_hold_obj(dp,
1691 attr->za_first_integer, FTAG, &ds);
1692 if (err != 0)
1693 break;
1694 err = dcp->dc_func(dp, ds, dcp->dc_arg);
1695 dsl_dataset_rele(ds, FTAG);
1696 if (err != 0)
1697 break;
1698 }
1699 zap_cursor_fini(&zc);
1700 }
1701 }
1702
1703 dsl_dir_rele(dd, FTAG);
1704 kmem_free(attr, sizeof (zap_attribute_t));
1705
1706 if (err != 0)
1707 goto out;
1708
1709 /*
1710 * Apply to self.
1711 */
1712 err = dsl_dataset_hold_obj(dp, thisobj, FTAG, &ds);
1713 if (err != 0)
1714 goto out;
1715 err = dcp->dc_func(dp, ds, dcp->dc_arg);
1716 dsl_dataset_rele(ds, FTAG);
1717
1718 out:
1719 if (err != 0) {
1720 mutex_enter(dcp->dc_error_lock);
1721 /* only keep first error */
1722 if (*dcp->dc_error == 0)
1723 *dcp->dc_error = err;
1724 mutex_exit(dcp->dc_error_lock);
1725 }
1726
1727 kmem_free(dcp, sizeof (*dcp));
1728 }
1729
1730 static void
1731 dmu_objset_find_dp_cb(void *arg)
1732 {
1733 dmu_objset_find_ctx_t *dcp = arg;
1734 dsl_pool_t *dp = dcp->dc_dp;
1735
1736 /*
1737 * We need to get a pool_config_lock here, as there are several
1738 * asssert(pool_config_held) down the stack. Getting a lock via
1739 * dsl_pool_config_enter is risky, as it might be stalled by a
1740 * pending writer. This would deadlock, as the write lock can
1741 * only be granted when our parent thread gives up the lock.
1742 * The _prio interface gives us priority over a pending writer.
1743 */
1744 dsl_pool_config_enter_prio(dp, FTAG);
1745
1746 dmu_objset_find_dp_impl(dcp);
1747
1748 dsl_pool_config_exit(dp, FTAG);
1749 }
1750
1751 /*
1752 * Find objsets under and including ddobj, call func(ds) on each.
1753 * The order for the enumeration is completely undefined.
1754 * func is called with dsl_pool_config held.
1755 */
1756 int
1757 dmu_objset_find_dp(dsl_pool_t *dp, uint64_t ddobj,
1758 int func(dsl_pool_t *, dsl_dataset_t *, void *), void *arg, int flags)
1759 {
1760 int error = 0;
1761 taskq_t *tq = NULL;
1762 int ntasks;
1763 dmu_objset_find_ctx_t *dcp;
1764 kmutex_t err_lock;
1765
1766 mutex_init(&err_lock, NULL, MUTEX_DEFAULT, NULL);
1767 dcp = kmem_alloc(sizeof (*dcp), KM_SLEEP);
1768 dcp->dc_tq = NULL;
1769 dcp->dc_dp = dp;
1770 dcp->dc_ddobj = ddobj;
1771 dcp->dc_func = func;
1772 dcp->dc_arg = arg;
1773 dcp->dc_flags = flags;
1774 dcp->dc_error_lock = &err_lock;
1775 dcp->dc_error = &error;
1776
1777 if ((flags & DS_FIND_SERIALIZE) || dsl_pool_config_held_writer(dp)) {
1778 /*
1779 * In case a write lock is held we can't make use of
1780 * parallelism, as down the stack of the worker threads
1781 * the lock is asserted via dsl_pool_config_held.
1782 * In case of a read lock this is solved by getting a read
1783 * lock in each worker thread, which isn't possible in case
1784 * of a writer lock. So we fall back to the synchronous path
1785 * here.
1786 * In the future it might be possible to get some magic into
1787 * dsl_pool_config_held in a way that it returns true for
1788 * the worker threads so that a single lock held from this
1789 * thread suffices. For now, stay single threaded.
1790 */
1791 dmu_objset_find_dp_impl(dcp);
1792
1793 return (error);
1794 }
1795
1796 ntasks = dmu_find_threads;
1797 if (ntasks == 0)
1798 ntasks = vdev_count_leaves(dp->dp_spa) * 4;
1799 tq = taskq_create("dmu_objset_find", ntasks, minclsyspri, ntasks,
1800 INT_MAX, 0);
1801 if (tq == NULL) {
1802 kmem_free(dcp, sizeof (*dcp));
1803 return (SET_ERROR(ENOMEM));
1804 }
1805 dcp->dc_tq = tq;
1806
1807 /* dcp will be freed by task */
1808 (void) taskq_dispatch(tq, dmu_objset_find_dp_cb, dcp, TQ_SLEEP);
1809
1810 /*
1811 * PORTING: this code relies on the property of taskq_wait to wait
1812 * until no more tasks are queued and no more tasks are active. As
1813 * we always queue new tasks from within other tasks, task_wait
1814 * reliably waits for the full recursion to finish, even though we
1815 * enqueue new tasks after taskq_wait has been called.
1816 * On platforms other than illumos, taskq_wait may not have this
1817 * property.
1818 */
1819 taskq_wait(tq);
1820 taskq_destroy(tq);
1821 mutex_destroy(&err_lock);
1822
1823 return (error);
1824 }
1825
1826 /*
1827 * Find all objsets under name, and for each, call 'func(child_name, arg)'.
1828 * The dp_config_rwlock must not be held when this is called, and it
1829 * will not be held when the callback is called.
1830 * Therefore this function should only be used when the pool is not changing
1831 * (e.g. in syncing context), or the callback can deal with the possible races.
1832 */
1833 static int
1834 dmu_objset_find_impl(spa_t *spa, const char *name,
1835 int func(const char *, void *), void *arg, int flags)
1836 {
1837 dsl_dir_t *dd;
1838 dsl_pool_t *dp = spa_get_dsl(spa);
1839 dsl_dataset_t *ds;
1840 zap_cursor_t zc;
1841 zap_attribute_t *attr;
1842 char *child;
1843 uint64_t thisobj;
1844 int err;
1845
1846 dsl_pool_config_enter(dp, FTAG);
1847
1848 err = dsl_dir_hold(dp, name, FTAG, &dd, NULL);
1849 if (err != 0) {
1850 dsl_pool_config_exit(dp, FTAG);
1851 return (err);
1852 }
1853
1854 /* Don't visit hidden ($MOS & $ORIGIN) objsets. */
1855 if (dd->dd_myname[0] == '$') {
1856 dsl_dir_rele(dd, FTAG);
1857 dsl_pool_config_exit(dp, FTAG);
1858 return (0);
1859 }
1860
1861 thisobj = dsl_dir_phys(dd)->dd_head_dataset_obj;
1862 attr = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP);
1863
1864 /*
1865 * Iterate over all children.
1866 */
1867 if (flags & DS_FIND_CHILDREN) {
1868 for (zap_cursor_init(&zc, dp->dp_meta_objset,
1869 dsl_dir_phys(dd)->dd_child_dir_zapobj);
1870 zap_cursor_retrieve(&zc, attr) == 0;
1871 (void) zap_cursor_advance(&zc)) {
1872 ASSERT3U(attr->za_integer_length, ==,
1873 sizeof (uint64_t));
1874 ASSERT3U(attr->za_num_integers, ==, 1);
1875
1876 child = kmem_asprintf("%s/%s", name, attr->za_name);
1877 dsl_pool_config_exit(dp, FTAG);
1878 err = dmu_objset_find_impl(spa, child,
1879 func, arg, flags);
1880 dsl_pool_config_enter(dp, FTAG);
1881 strfree(child);
1882 if (err != 0)
1883 break;
1884 }
1885 zap_cursor_fini(&zc);
1886
1887 if (err != 0) {
1888 dsl_dir_rele(dd, FTAG);
1889 dsl_pool_config_exit(dp, FTAG);
1890 kmem_free(attr, sizeof (zap_attribute_t));
1891 return (err);
1892 }
1893 }
1894
1895 /*
1896 * Iterate over all snapshots.
1897 */
1898 if (flags & DS_FIND_SNAPSHOTS) {
1899 err = dsl_dataset_hold_obj(dp, thisobj, FTAG, &ds);
1900
1901 if (err == 0) {
1902 uint64_t snapobj;
1903
1904 snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj;
1905 dsl_dataset_rele(ds, FTAG);
1906
1907 for (zap_cursor_init(&zc, dp->dp_meta_objset, snapobj);
1908 zap_cursor_retrieve(&zc, attr) == 0;
1909 (void) zap_cursor_advance(&zc)) {
1910 ASSERT3U(attr->za_integer_length, ==,
1911 sizeof (uint64_t));
1912 ASSERT3U(attr->za_num_integers, ==, 1);
1913
1914 child = kmem_asprintf("%s@%s",
1915 name, attr->za_name);
1916 dsl_pool_config_exit(dp, FTAG);
1917 err = func(child, arg);
1918 dsl_pool_config_enter(dp, FTAG);
1919 strfree(child);
1920 if (err != 0)
1921 break;
1922 }
1923 zap_cursor_fini(&zc);
1924 }
1925 }
1926
1927 dsl_dir_rele(dd, FTAG);
1928 kmem_free(attr, sizeof (zap_attribute_t));
1929 dsl_pool_config_exit(dp, FTAG);
1930
1931 if (err != 0)
1932 return (err);
1933
1934 /* Apply to self. */
1935 return (func(name, arg));
1936 }
1937
1938 /*
1939 * See comment above dmu_objset_find_impl().
1940 */
1941 int
1942 dmu_objset_find(char *name, int func(const char *, void *), void *arg,
1943 int flags)
1944 {
1945 spa_t *spa;
1946 int error;
1947
1948 error = spa_open(name, &spa, FTAG);
1949 if (error != 0)
1950 return (error);
1951 error = dmu_objset_find_impl(spa, name, func, arg, flags);
1952 spa_close(spa, FTAG);
1953 return (error);
1954 }
1955
1956 void
1957 dmu_objset_set_user(objset_t *os, void *user_ptr)
1958 {
1959 ASSERT(MUTEX_HELD(&os->os_user_ptr_lock));
1960 os->os_user_ptr = user_ptr;
1961 }
1962
1963 void *
1964 dmu_objset_get_user(objset_t *os)
1965 {
1966 ASSERT(MUTEX_HELD(&os->os_user_ptr_lock));
1967 return (os->os_user_ptr);
1968 }
1969
1970 /*
1971 * Determine name of filesystem, given name of snapshot.
1972 * buf must be at least MAXNAMELEN bytes
1973 */
1974 int
1975 dmu_fsname(const char *snapname, char *buf)
1976 {
1977 char *atp = strchr(snapname, '@');
1978 if (atp == NULL)
1979 return (SET_ERROR(EINVAL));
1980 if (atp - snapname >= MAXNAMELEN)
1981 return (SET_ERROR(ENAMETOOLONG));
1982 (void) strlcpy(buf, snapname, atp - snapname + 1);
1983 return (0);
1984 }
Unleashed OS