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) 2013 by Delphix. All rights reserved.
24 * Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
25 */
26
27 /* Portions Copyright 2010 Robert Milkowski */
28
29 #include <sys/cred.h>
30 #include <sys/zfs_context.h>
31 #include <sys/dmu_objset.h>
32 #include <sys/dsl_dir.h>
33 #include <sys/dsl_dataset.h>
34 #include <sys/dsl_prop.h>
35 #include <sys/dsl_pool.h>
36 #include <sys/dsl_synctask.h>
37 #include <sys/dsl_deleg.h>
38 #include <sys/dnode.h>
39 #include <sys/dbuf.h>
40 #include <sys/zvol.h>
41 #include <sys/dmu_tx.h>
42 #include <sys/zap.h>
43 #include <sys/zil.h>
44 #include <sys/dmu_impl.h>
45 #include <sys/zfs_ioctl.h>
46 #include <sys/sa.h>
47 #include <sys/zfs_onexit.h>
48 #include <sys/dsl_destroy.h>
49
50 /*
51 * Needed to close a window in dnode_move() that allows the objset to be freed
52 * before it can be safely accessed.
53 */
54 krwlock_t os_lock;
55
56 void
57 dmu_objset_init(void)
58 {
59 rw_init(&os_lock, NULL, RW_DEFAULT, NULL);
60 }
61
62 void
63 dmu_objset_fini(void)
64 {
65 rw_destroy(&os_lock);
66 }
67
68 spa_t *
69 dmu_objset_spa(objset_t *os)
70 {
71 return (os->os_spa);
72 }
73
74 zilog_t *
75 dmu_objset_zil(objset_t *os)
76 {
77 return (os->os_zil);
78 }
79
80 dsl_pool_t *
81 dmu_objset_pool(objset_t *os)
82 {
83 dsl_dataset_t *ds;
84
85 if ((ds = os->os_dsl_dataset) != NULL && ds->ds_dir)
86 return (ds->ds_dir->dd_pool);
87 else
88 return (spa_get_dsl(os->os_spa));
89 }
90
91 dsl_dataset_t *
92 dmu_objset_ds(objset_t *os)
93 {
94 return (os->os_dsl_dataset);
95 }
96
97 dmu_objset_type_t
98 dmu_objset_type(objset_t *os)
99 {
100 return (os->os_phys->os_type);
101 }
102
103 void
104 dmu_objset_name(objset_t *os, char *buf)
105 {
106 dsl_dataset_name(os->os_dsl_dataset, buf);
107 }
108
109 uint64_t
110 dmu_objset_id(objset_t *os)
111 {
112 dsl_dataset_t *ds = os->os_dsl_dataset;
113
114 return (ds ? ds->ds_object : 0);
115 }
116
117 uint64_t
118 dmu_objset_syncprop(objset_t *os)
119 {
120 return (os->os_sync);
121 }
122
123 uint64_t
124 dmu_objset_logbias(objset_t *os)
125 {
126 return (os->os_logbias);
127 }
128
129 static void
130 checksum_changed_cb(void *arg, uint64_t newval)
131 {
132 objset_t *os = arg;
133
134 /*
135 * Inheritance should have been done by now.
136 */
137 ASSERT(newval != ZIO_CHECKSUM_INHERIT);
138
139 os->os_checksum = zio_checksum_select(newval, ZIO_CHECKSUM_ON_VALUE);
140 }
141
142 static void
143 compression_changed_cb(void *arg, uint64_t newval)
144 {
145 objset_t *os = arg;
146
147 /*
148 * Inheritance and range checking should have been done by now.
149 */
150 ASSERT(newval != ZIO_COMPRESS_INHERIT);
151
152 os->os_compress = zio_compress_select(newval, ZIO_COMPRESS_ON_VALUE);
153 }
154
155 static void
156 copies_changed_cb(void *arg, uint64_t newval)
157 {
158 objset_t *os = arg;
159
160 /*
161 * Inheritance and range checking should have been done by now.
162 */
163 ASSERT(newval > 0);
164 ASSERT(newval <= spa_max_replication(os->os_spa));
165
166 os->os_copies = newval;
167 }
168
169 static void
170 dedup_changed_cb(void *arg, uint64_t newval)
171 {
172 objset_t *os = arg;
173 spa_t *spa = os->os_spa;
174 enum zio_checksum checksum;
175
176 /*
177 * Inheritance should have been done by now.
178 */
179 ASSERT(newval != ZIO_CHECKSUM_INHERIT);
180
181 checksum = zio_checksum_dedup_select(spa, newval, ZIO_CHECKSUM_OFF);
182
183 os->os_dedup_checksum = checksum & ZIO_CHECKSUM_MASK;
184 os->os_dedup_verify = !!(checksum & ZIO_CHECKSUM_VERIFY);
185 }
186
187 static void
188 primary_cache_changed_cb(void *arg, uint64_t newval)
189 {
190 objset_t *os = arg;
191
192 /*
193 * Inheritance and range checking should have been done by now.
194 */
195 ASSERT(newval == ZFS_CACHE_ALL || newval == ZFS_CACHE_NONE ||
196 newval == ZFS_CACHE_METADATA);
197
198 os->os_primary_cache = newval;
199 }
200
201 static void
202 secondary_cache_changed_cb(void *arg, uint64_t newval)
203 {
204 objset_t *os = arg;
205
206 /*
207 * Inheritance and range checking should have been done by now.
208 */
209 ASSERT(newval == ZFS_CACHE_ALL || newval == ZFS_CACHE_NONE ||
210 newval == ZFS_CACHE_METADATA);
211
212 os->os_secondary_cache = newval;
213 }
214
215 static void
216 sync_changed_cb(void *arg, uint64_t newval)
217 {
218 objset_t *os = arg;
219
220 /*
221 * Inheritance and range checking should have been done by now.
222 */
223 ASSERT(newval == ZFS_SYNC_STANDARD || newval == ZFS_SYNC_ALWAYS ||
224 newval == ZFS_SYNC_DISABLED);
225
226 os->os_sync = newval;
227 if (os->os_zil)
228 zil_set_sync(os->os_zil, newval);
229 }
230
231 static void
232 logbias_changed_cb(void *arg, uint64_t newval)
233 {
234 objset_t *os = arg;
235
236 ASSERT(newval == ZFS_LOGBIAS_LATENCY ||
237 newval == ZFS_LOGBIAS_THROUGHPUT);
238 os->os_logbias = newval;
239 if (os->os_zil)
240 zil_set_logbias(os->os_zil, newval);
241 }
242
243 void
244 dmu_objset_byteswap(void *buf, size_t size)
245 {
246 objset_phys_t *osp = buf;
247
248 ASSERT(size == OBJSET_OLD_PHYS_SIZE || size == sizeof (objset_phys_t));
249 dnode_byteswap(&osp->os_meta_dnode);
250 byteswap_uint64_array(&osp->os_zil_header, sizeof (zil_header_t));
251 osp->os_type = BSWAP_64(osp->os_type);
252 osp->os_flags = BSWAP_64(osp->os_flags);
253 if (size == sizeof (objset_phys_t)) {
254 dnode_byteswap(&osp->os_userused_dnode);
255 dnode_byteswap(&osp->os_groupused_dnode);
256 }
257 }
258
259 int
260 dmu_objset_open_impl(spa_t *spa, dsl_dataset_t *ds, blkptr_t *bp,
261 objset_t **osp)
262 {
263 objset_t *os;
264 int i, err;
265
266 ASSERT(ds == NULL || MUTEX_HELD(&ds->ds_opening_lock));
267
268 os = kmem_zalloc(sizeof (objset_t), KM_SLEEP);
269 os->os_dsl_dataset = ds;
270 os->os_spa = spa;
271 os->os_rootbp = bp;
272 if (!BP_IS_HOLE(os->os_rootbp)) {
273 uint32_t aflags = ARC_WAIT;
274 zbookmark_t zb;
275 SET_BOOKMARK(&zb, ds ? ds->ds_object : DMU_META_OBJSET,
276 ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID);
277
278 if (DMU_OS_IS_L2CACHEABLE(os))
279 aflags |= ARC_L2CACHE;
280 if (DMU_OS_IS_L2COMPRESSIBLE(os))
281 aflags |= ARC_L2COMPRESS;
282
283 dprintf_bp(os->os_rootbp, "reading %s", "");
284 err = arc_read(NULL, spa, os->os_rootbp,
285 arc_getbuf_func, &os->os_phys_buf,
286 ZIO_PRIORITY_SYNC_READ, ZIO_FLAG_CANFAIL, &aflags, &zb);
287 if (err != 0) {
288 kmem_free(os, sizeof (objset_t));
289 /* convert checksum errors into IO errors */
290 if (err == ECKSUM)
291 err = SET_ERROR(EIO);
292 return (err);
293 }
294
295 /* Increase the blocksize if we are permitted. */
296 if (spa_version(spa) >= SPA_VERSION_USERSPACE &&
297 arc_buf_size(os->os_phys_buf) < sizeof (objset_phys_t)) {
298 arc_buf_t *buf = arc_buf_alloc(spa,
299 sizeof (objset_phys_t), &os->os_phys_buf,
300 ARC_BUFC_METADATA);
301 bzero(buf->b_data, sizeof (objset_phys_t));
302 bcopy(os->os_phys_buf->b_data, buf->b_data,
303 arc_buf_size(os->os_phys_buf));
304 (void) arc_buf_remove_ref(os->os_phys_buf,
305 &os->os_phys_buf);
306 os->os_phys_buf = buf;
307 }
308
309 os->os_phys = os->os_phys_buf->b_data;
310 os->os_flags = os->os_phys->os_flags;
311 } else {
312 int size = spa_version(spa) >= SPA_VERSION_USERSPACE ?
313 sizeof (objset_phys_t) : OBJSET_OLD_PHYS_SIZE;
314 os->os_phys_buf = arc_buf_alloc(spa, size,
315 &os->os_phys_buf, ARC_BUFC_METADATA);
316 os->os_phys = os->os_phys_buf->b_data;
317 bzero(os->os_phys, size);
318 }
319
320 /*
321 * Note: the changed_cb will be called once before the register
322 * func returns, thus changing the checksum/compression from the
323 * default (fletcher2/off). Snapshots don't need to know about
324 * checksum/compression/copies.
325 */
326 if (ds) {
327 err = dsl_prop_register(ds,
328 zfs_prop_to_name(ZFS_PROP_PRIMARYCACHE),
329 primary_cache_changed_cb, os);
330 if (err == 0) {
331 err = dsl_prop_register(ds,
332 zfs_prop_to_name(ZFS_PROP_SECONDARYCACHE),
333 secondary_cache_changed_cb, os);
334 }
335 if (!dsl_dataset_is_snapshot(ds)) {
336 if (err == 0) {
337 err = dsl_prop_register(ds,
338 zfs_prop_to_name(ZFS_PROP_CHECKSUM),
339 checksum_changed_cb, os);
340 }
341 if (err == 0) {
342 err = dsl_prop_register(ds,
343 zfs_prop_to_name(ZFS_PROP_COMPRESSION),
344 compression_changed_cb, os);
345 }
346 if (err == 0) {
347 err = dsl_prop_register(ds,
348 zfs_prop_to_name(ZFS_PROP_COPIES),
349 copies_changed_cb, os);
350 }
351 if (err == 0) {
352 err = dsl_prop_register(ds,
353 zfs_prop_to_name(ZFS_PROP_DEDUP),
354 dedup_changed_cb, os);
355 }
356 if (err == 0) {
357 err = dsl_prop_register(ds,
358 zfs_prop_to_name(ZFS_PROP_LOGBIAS),
359 logbias_changed_cb, os);
360 }
361 if (err == 0) {
362 err = dsl_prop_register(ds,
363 zfs_prop_to_name(ZFS_PROP_SYNC),
364 sync_changed_cb, os);
365 }
366 }
367 if (err != 0) {
368 VERIFY(arc_buf_remove_ref(os->os_phys_buf,
369 &os->os_phys_buf));
370 kmem_free(os, sizeof (objset_t));
371 return (err);
372 }
373 } else if (ds == NULL) {
374 /* It's the meta-objset. */
375 os->os_checksum = ZIO_CHECKSUM_FLETCHER_4;
376 os->os_compress = ZIO_COMPRESS_LZJB;
377 os->os_copies = spa_max_replication(spa);
378 os->os_dedup_checksum = ZIO_CHECKSUM_OFF;
379 os->os_dedup_verify = 0;
380 os->os_logbias = 0;
381 os->os_sync = 0;
382 os->os_primary_cache = ZFS_CACHE_ALL;
383 os->os_secondary_cache = ZFS_CACHE_ALL;
384 }
385
386 if (ds == NULL || !dsl_dataset_is_snapshot(ds))
387 os->os_zil_header = os->os_phys->os_zil_header;
388 os->os_zil = zil_alloc(os, &os->os_zil_header);
389
390 for (i = 0; i < TXG_SIZE; i++) {
391 list_create(&os->os_dirty_dnodes[i], sizeof (dnode_t),
392 offsetof(dnode_t, dn_dirty_link[i]));
393 list_create(&os->os_free_dnodes[i], sizeof (dnode_t),
394 offsetof(dnode_t, dn_dirty_link[i]));
395 }
396 list_create(&os->os_dnodes, sizeof (dnode_t),
397 offsetof(dnode_t, dn_link));
398 list_create(&os->os_downgraded_dbufs, sizeof (dmu_buf_impl_t),
399 offsetof(dmu_buf_impl_t, db_link));
400
401 mutex_init(&os->os_lock, NULL, MUTEX_DEFAULT, NULL);
402 mutex_init(&os->os_obj_lock, NULL, MUTEX_DEFAULT, NULL);
403 mutex_init(&os->os_user_ptr_lock, NULL, MUTEX_DEFAULT, NULL);
404
405 DMU_META_DNODE(os) = dnode_special_open(os,
406 &os->os_phys->os_meta_dnode, DMU_META_DNODE_OBJECT,
407 &os->os_meta_dnode);
408 if (arc_buf_size(os->os_phys_buf) >= sizeof (objset_phys_t)) {
409 DMU_USERUSED_DNODE(os) = dnode_special_open(os,
410 &os->os_phys->os_userused_dnode, DMU_USERUSED_OBJECT,
411 &os->os_userused_dnode);
412 DMU_GROUPUSED_DNODE(os) = dnode_special_open(os,
413 &os->os_phys->os_groupused_dnode, DMU_GROUPUSED_OBJECT,
414 &os->os_groupused_dnode);
415 }
416
417 /*
418 * We should be the only thread trying to do this because we
419 * have ds_opening_lock
420 */
421 if (ds) {
422 mutex_enter(&ds->ds_lock);
423 ASSERT(ds->ds_objset == NULL);
424 ds->ds_objset = os;
425 mutex_exit(&ds->ds_lock);
426 }
427
428 *osp = os;
429 return (0);
430 }
431
432 int
433 dmu_objset_from_ds(dsl_dataset_t *ds, objset_t **osp)
434 {
435 int err = 0;
436
437 mutex_enter(&ds->ds_opening_lock);
438 *osp = ds->ds_objset;
439 if (*osp == NULL) {
440 err = dmu_objset_open_impl(dsl_dataset_get_spa(ds),
441 ds, dsl_dataset_get_blkptr(ds), osp);
442 }
443 mutex_exit(&ds->ds_opening_lock);
444 return (err);
445 }
446
447 /*
448 * Holds the pool while the objset is held. Therefore only one objset
449 * can be held at a time.
450 */
451 int
452 dmu_objset_hold(const char *name, void *tag, objset_t **osp)
453 {
454 dsl_pool_t *dp;
455 dsl_dataset_t *ds;
456 int err;
457
458 err = dsl_pool_hold(name, tag, &dp);
459 if (err != 0)
460 return (err);
461 err = dsl_dataset_hold(dp, name, tag, &ds);
462 if (err != 0) {
463 dsl_pool_rele(dp, tag);
464 return (err);
465 }
466
467 err = dmu_objset_from_ds(ds, osp);
468 if (err != 0) {
469 dsl_dataset_rele(ds, tag);
470 dsl_pool_rele(dp, tag);
471 }
472
473 return (err);
474 }
475
476 /*
477 * dsl_pool must not be held when this is called.
478 * Upon successful return, there will be a longhold on the dataset,
479 * and the dsl_pool will not be held.
480 */
481 int
482 dmu_objset_own(const char *name, dmu_objset_type_t type,
483 boolean_t readonly, void *tag, objset_t **osp)
484 {
485 dsl_pool_t *dp;
486 dsl_dataset_t *ds;
487 int err;
488
489 err = dsl_pool_hold(name, FTAG, &dp);
490 if (err != 0)
491 return (err);
492 err = dsl_dataset_own(dp, name, tag, &ds);
493 if (err != 0) {
494 dsl_pool_rele(dp, FTAG);
495 return (err);
496 }
497
498 err = dmu_objset_from_ds(ds, osp);
499 dsl_pool_rele(dp, FTAG);
500 if (err != 0) {
501 dsl_dataset_disown(ds, tag);
502 } else if (type != DMU_OST_ANY && type != (*osp)->os_phys->os_type) {
503 dsl_dataset_disown(ds, tag);
504 return (SET_ERROR(EINVAL));
505 } else if (!readonly && dsl_dataset_is_snapshot(ds)) {
506 dsl_dataset_disown(ds, tag);
507 return (SET_ERROR(EROFS));
508 }
509 return (err);
510 }
511
512 void
513 dmu_objset_rele(objset_t *os, void *tag)
514 {
515 dsl_pool_t *dp = dmu_objset_pool(os);
516 dsl_dataset_rele(os->os_dsl_dataset, tag);
517 dsl_pool_rele(dp, tag);
518 }
519
520 /*
521 * When we are called, os MUST refer to an objset associated with a dataset
522 * that is owned by 'tag'; that is, is held and long held by 'tag' and ds_owner
523 * == tag. We will then release and reacquire ownership of the dataset while
524 * holding the pool config_rwlock to avoid intervening namespace or ownership
525 * changes may occur.
526 *
527 * This exists solely to accommodate zfs_ioc_userspace_upgrade()'s desire to
528 * release the hold on its dataset and acquire a new one on the dataset of the
529 * same name so that it can be partially torn down and reconstructed.
530 */
531 void
532 dmu_objset_refresh_ownership(objset_t *os, void *tag)
533 {
534 dsl_pool_t *dp;
535 dsl_dataset_t *ds, *newds;
536 char name[MAXNAMELEN];
537
538 ds = os->os_dsl_dataset;
539 VERIFY3P(ds, !=, NULL);
540 VERIFY3P(ds->ds_owner, ==, tag);
541 VERIFY(dsl_dataset_long_held(ds));
542
543 dsl_dataset_name(ds, name);
544 dp = dmu_objset_pool(os);
545 dsl_pool_config_enter(dp, FTAG);
546 dmu_objset_disown(os, tag);
547 VERIFY0(dsl_dataset_own(dp, name, tag, &newds));
548 VERIFY3P(newds, ==, os->os_dsl_dataset);
549 dsl_pool_config_exit(dp, FTAG);
550 }
551
552 void
553 dmu_objset_disown(objset_t *os, void *tag)
554 {
555 dsl_dataset_disown(os->os_dsl_dataset, tag);
556 }
557
558 void
559 dmu_objset_evict_dbufs(objset_t *os)
560 {
561 dnode_t *dn;
562
563 mutex_enter(&os->os_lock);
564
565 /* process the mdn last, since the other dnodes have holds on it */
566 list_remove(&os->os_dnodes, DMU_META_DNODE(os));
567 list_insert_tail(&os->os_dnodes, DMU_META_DNODE(os));
568
569 /*
570 * Find the first dnode with holds. We have to do this dance
571 * because dnode_add_ref() only works if you already have a
572 * hold. If there are no holds then it has no dbufs so OK to
573 * skip.
574 */
575 for (dn = list_head(&os->os_dnodes);
576 dn && !dnode_add_ref(dn, FTAG);
577 dn = list_next(&os->os_dnodes, dn))
578 continue;
579
580 while (dn) {
581 dnode_t *next_dn = dn;
582
583 do {
584 next_dn = list_next(&os->os_dnodes, next_dn);
585 } while (next_dn && !dnode_add_ref(next_dn, FTAG));
586
587 mutex_exit(&os->os_lock);
588 dnode_evict_dbufs(dn);
589 dnode_rele(dn, FTAG);
590 mutex_enter(&os->os_lock);
591 dn = next_dn;
592 }
593 mutex_exit(&os->os_lock);
594 }
595
596 void
597 dmu_objset_evict(objset_t *os)
598 {
599 dsl_dataset_t *ds = os->os_dsl_dataset;
600
601 for (int t = 0; t < TXG_SIZE; t++)
602 ASSERT(!dmu_objset_is_dirty(os, t));
603
604 if (ds) {
605 if (!dsl_dataset_is_snapshot(ds)) {
606 VERIFY0(dsl_prop_unregister(ds,
607 zfs_prop_to_name(ZFS_PROP_CHECKSUM),
608 checksum_changed_cb, os));
609 VERIFY0(dsl_prop_unregister(ds,
610 zfs_prop_to_name(ZFS_PROP_COMPRESSION),
611 compression_changed_cb, os));
612 VERIFY0(dsl_prop_unregister(ds,
613 zfs_prop_to_name(ZFS_PROP_COPIES),
614 copies_changed_cb, os));
615 VERIFY0(dsl_prop_unregister(ds,
616 zfs_prop_to_name(ZFS_PROP_DEDUP),
617 dedup_changed_cb, os));
618 VERIFY0(dsl_prop_unregister(ds,
619 zfs_prop_to_name(ZFS_PROP_LOGBIAS),
620 logbias_changed_cb, os));
621 VERIFY0(dsl_prop_unregister(ds,
622 zfs_prop_to_name(ZFS_PROP_SYNC),
623 sync_changed_cb, os));
624 }
625 VERIFY0(dsl_prop_unregister(ds,
626 zfs_prop_to_name(ZFS_PROP_PRIMARYCACHE),
627 primary_cache_changed_cb, os));
628 VERIFY0(dsl_prop_unregister(ds,
629 zfs_prop_to_name(ZFS_PROP_SECONDARYCACHE),
630 secondary_cache_changed_cb, os));
631 }
632
633 if (os->os_sa)
634 sa_tear_down(os);
635
636 dmu_objset_evict_dbufs(os);
637
638 dnode_special_close(&os->os_meta_dnode);
639 if (DMU_USERUSED_DNODE(os)) {
640 dnode_special_close(&os->os_userused_dnode);
641 dnode_special_close(&os->os_groupused_dnode);
642 }
643 zil_free(os->os_zil);
644
645 ASSERT3P(list_head(&os->os_dnodes), ==, NULL);
646
647 VERIFY(arc_buf_remove_ref(os->os_phys_buf, &os->os_phys_buf));
648
649 /*
650 * This is a barrier to prevent the objset from going away in
651 * dnode_move() until we can safely ensure that the objset is still in
652 * use. We consider the objset valid before the barrier and invalid
653 * after the barrier.
654 */
655 rw_enter(&os_lock, RW_READER);
656 rw_exit(&os_lock);
657
658 mutex_destroy(&os->os_lock);
659 mutex_destroy(&os->os_obj_lock);
660 mutex_destroy(&os->os_user_ptr_lock);
661 kmem_free(os, sizeof (objset_t));
662 }
663
664 timestruc_t
665 dmu_objset_snap_cmtime(objset_t *os)
666 {
667 return (dsl_dir_snap_cmtime(os->os_dsl_dataset->ds_dir));
668 }
669
670 /* called from dsl for meta-objset */
671 objset_t *
672 dmu_objset_create_impl(spa_t *spa, dsl_dataset_t *ds, blkptr_t *bp,
673 dmu_objset_type_t type, dmu_tx_t *tx)
674 {
675 objset_t *os;
676 dnode_t *mdn;
677
678 ASSERT(dmu_tx_is_syncing(tx));
679
680 if (ds != NULL)
681 VERIFY0(dmu_objset_from_ds(ds, &os));
682 else
683 VERIFY0(dmu_objset_open_impl(spa, NULL, bp, &os));
684
685 mdn = DMU_META_DNODE(os);
686
687 dnode_allocate(mdn, DMU_OT_DNODE, 1 << DNODE_BLOCK_SHIFT,
688 DN_MAX_INDBLKSHIFT, DMU_OT_NONE, 0, tx);
689
690 /*
691 * We don't want to have to increase the meta-dnode's nlevels
692 * later, because then we could do it in quescing context while
693 * we are also accessing it in open context.
694 *
695 * This precaution is not necessary for the MOS (ds == NULL),
696 * because the MOS is only updated in syncing context.
697 * This is most fortunate: the MOS is the only objset that
698 * needs to be synced multiple times as spa_sync() iterates
699 * to convergence, so minimizing its dn_nlevels matters.
700 */
701 if (ds != NULL) {
702 int levels = 1;
703
704 /*
705 * Determine the number of levels necessary for the meta-dnode
706 * to contain DN_MAX_OBJECT dnodes.
707 */
708 while ((uint64_t)mdn->dn_nblkptr << (mdn->dn_datablkshift +
709 (levels - 1) * (mdn->dn_indblkshift - SPA_BLKPTRSHIFT)) <
710 DN_MAX_OBJECT * sizeof (dnode_phys_t))
711 levels++;
712
713 mdn->dn_next_nlevels[tx->tx_txg & TXG_MASK] =
714 mdn->dn_nlevels = levels;
715 }
716
717 ASSERT(type != DMU_OST_NONE);
718 ASSERT(type != DMU_OST_ANY);
719 ASSERT(type < DMU_OST_NUMTYPES);
720 os->os_phys->os_type = type;
721 if (dmu_objset_userused_enabled(os)) {
722 os->os_phys->os_flags |= OBJSET_FLAG_USERACCOUNTING_COMPLETE;
723 os->os_flags = os->os_phys->os_flags;
724 }
725
726 dsl_dataset_dirty(ds, tx);
727
728 return (os);
729 }
730
731 typedef struct dmu_objset_create_arg {
732 const char *doca_name;
733 cred_t *doca_cred;
734 void (*doca_userfunc)(objset_t *os, void *arg,
735 cred_t *cr, dmu_tx_t *tx);
736 void *doca_userarg;
737 dmu_objset_type_t doca_type;
738 uint64_t doca_flags;
739 } dmu_objset_create_arg_t;
740
741 /*ARGSUSED*/
742 static int
743 dmu_objset_create_check(void *arg, dmu_tx_t *tx)
744 {
745 dmu_objset_create_arg_t *doca = arg;
746 dsl_pool_t *dp = dmu_tx_pool(tx);
747 dsl_dir_t *pdd;
748 const char *tail;
749 int error;
750
751 if (strchr(doca->doca_name, '@') != NULL)
752 return (SET_ERROR(EINVAL));
753
754 error = dsl_dir_hold(dp, doca->doca_name, FTAG, &pdd, &tail);
755 if (error != 0)
756 return (error);
757 if (tail == NULL) {
758 dsl_dir_rele(pdd, FTAG);
759 return (SET_ERROR(EEXIST));
760 }
761 dsl_dir_rele(pdd, FTAG);
762
763 return (0);
764 }
765
766 static void
767 dmu_objset_create_sync(void *arg, dmu_tx_t *tx)
768 {
769 dmu_objset_create_arg_t *doca = arg;
770 dsl_pool_t *dp = dmu_tx_pool(tx);
771 dsl_dir_t *pdd;
772 const char *tail;
773 dsl_dataset_t *ds;
774 uint64_t obj;
775 blkptr_t *bp;
776 objset_t *os;
777
778 VERIFY0(dsl_dir_hold(dp, doca->doca_name, FTAG, &pdd, &tail));
779
780 obj = dsl_dataset_create_sync(pdd, tail, NULL, doca->doca_flags,
781 doca->doca_cred, tx);
782
783 VERIFY0(dsl_dataset_hold_obj(pdd->dd_pool, obj, FTAG, &ds));
784 bp = dsl_dataset_get_blkptr(ds);
785 os = dmu_objset_create_impl(pdd->dd_pool->dp_spa,
786 ds, bp, doca->doca_type, tx);
787
788 if (doca->doca_userfunc != NULL) {
789 doca->doca_userfunc(os, doca->doca_userarg,
790 doca->doca_cred, tx);
791 }
792
793 spa_history_log_internal_ds(ds, "create", tx, "");
794 dsl_dataset_rele(ds, FTAG);
795 dsl_dir_rele(pdd, FTAG);
796 }
797
798 int
799 dmu_objset_create(const char *name, dmu_objset_type_t type, uint64_t flags,
800 void (*func)(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx), void *arg)
801 {
802 dmu_objset_create_arg_t doca;
803
804 doca.doca_name = name;
805 doca.doca_cred = CRED();
806 doca.doca_flags = flags;
807 doca.doca_userfunc = func;
808 doca.doca_userarg = arg;
809 doca.doca_type = type;
810
811 return (dsl_sync_task(name,
812 dmu_objset_create_check, dmu_objset_create_sync, &doca, 5));
813 }
814
815 typedef struct dmu_objset_clone_arg {
816 const char *doca_clone;
817 const char *doca_origin;
818 cred_t *doca_cred;
819 } dmu_objset_clone_arg_t;
820
821 /*ARGSUSED*/
822 static int
823 dmu_objset_clone_check(void *arg, dmu_tx_t *tx)
824 {
825 dmu_objset_clone_arg_t *doca = arg;
826 dsl_dir_t *pdd;
827 const char *tail;
828 int error;
829 dsl_dataset_t *origin;
830 dsl_pool_t *dp = dmu_tx_pool(tx);
831
832 if (strchr(doca->doca_clone, '@') != NULL)
833 return (SET_ERROR(EINVAL));
834
835 error = dsl_dir_hold(dp, doca->doca_clone, FTAG, &pdd, &tail);
836 if (error != 0)
837 return (error);
838 if (tail == NULL) {
839 dsl_dir_rele(pdd, FTAG);
840 return (SET_ERROR(EEXIST));
841 }
842 /* You can't clone across pools. */
843 if (pdd->dd_pool != dp) {
844 dsl_dir_rele(pdd, FTAG);
845 return (SET_ERROR(EXDEV));
846 }
847 dsl_dir_rele(pdd, FTAG);
848
849 error = dsl_dataset_hold(dp, doca->doca_origin, FTAG, &origin);
850 if (error != 0)
851 return (error);
852
853 /* You can't clone across pools. */
854 if (origin->ds_dir->dd_pool != dp) {
855 dsl_dataset_rele(origin, FTAG);
856 return (SET_ERROR(EXDEV));
857 }
858
859 /* You can only clone snapshots, not the head datasets. */
860 if (!dsl_dataset_is_snapshot(origin)) {
861 dsl_dataset_rele(origin, FTAG);
862 return (SET_ERROR(EINVAL));
863 }
864 dsl_dataset_rele(origin, FTAG);
865
866 return (0);
867 }
868
869 static void
870 dmu_objset_clone_sync(void *arg, dmu_tx_t *tx)
871 {
872 dmu_objset_clone_arg_t *doca = arg;
873 dsl_pool_t *dp = dmu_tx_pool(tx);
874 dsl_dir_t *pdd;
875 const char *tail;
876 dsl_dataset_t *origin, *ds;
877 uint64_t obj;
878 char namebuf[MAXNAMELEN];
879
880 VERIFY0(dsl_dir_hold(dp, doca->doca_clone, FTAG, &pdd, &tail));
881 VERIFY0(dsl_dataset_hold(dp, doca->doca_origin, FTAG, &origin));
882
883 obj = dsl_dataset_create_sync(pdd, tail, origin, 0,
884 doca->doca_cred, tx);
885
886 VERIFY0(dsl_dataset_hold_obj(pdd->dd_pool, obj, FTAG, &ds));
887 dsl_dataset_name(origin, namebuf);
888 spa_history_log_internal_ds(ds, "clone", tx,
889 "origin=%s (%llu)", namebuf, origin->ds_object);
890 dsl_dataset_rele(ds, FTAG);
891 dsl_dataset_rele(origin, FTAG);
892 dsl_dir_rele(pdd, FTAG);
893 }
894
895 int
896 dmu_objset_clone(const char *clone, const char *origin)
897 {
898 dmu_objset_clone_arg_t doca;
899
900 doca.doca_clone = clone;
901 doca.doca_origin = origin;
902 doca.doca_cred = CRED();
903
904 return (dsl_sync_task(clone,
905 dmu_objset_clone_check, dmu_objset_clone_sync, &doca, 5));
906 }
907
908 int
909 dmu_objset_snapshot_one(const char *fsname, const char *snapname)
910 {
911 int err;
912 char *longsnap = kmem_asprintf("%s@%s", fsname, snapname);
913 nvlist_t *snaps = fnvlist_alloc();
914
915 fnvlist_add_boolean(snaps, longsnap);
916 strfree(longsnap);
917 err = dsl_dataset_snapshot(snaps, NULL, NULL);
918 fnvlist_free(snaps);
919 return (err);
920 }
921
922 static void
923 dmu_objset_sync_dnodes(list_t *list, list_t *newlist, dmu_tx_t *tx)
924 {
925 dnode_t *dn;
926
927 while (dn = list_head(list)) {
928 ASSERT(dn->dn_object != DMU_META_DNODE_OBJECT);
929 ASSERT(dn->dn_dbuf->db_data_pending);
930 /*
931 * Initialize dn_zio outside dnode_sync() because the
932 * meta-dnode needs to set it ouside dnode_sync().
933 */
934 dn->dn_zio = dn->dn_dbuf->db_data_pending->dr_zio;
935 ASSERT(dn->dn_zio);
936
937 ASSERT3U(dn->dn_nlevels, <=, DN_MAX_LEVELS);
938 list_remove(list, dn);
939
940 if (newlist) {
941 (void) dnode_add_ref(dn, newlist);
942 list_insert_tail(newlist, dn);
943 }
944
945 dnode_sync(dn, tx);
946 }
947 }
948
949 /* ARGSUSED */
950 static void
951 dmu_objset_write_ready(zio_t *zio, arc_buf_t *abuf, void *arg)
952 {
953 blkptr_t *bp = zio->io_bp;
954 objset_t *os = arg;
955 dnode_phys_t *dnp = &os->os_phys->os_meta_dnode;
956
957 ASSERT3P(bp, ==, os->os_rootbp);
958 ASSERT3U(BP_GET_TYPE(bp), ==, DMU_OT_OBJSET);
959 ASSERT0(BP_GET_LEVEL(bp));
960
961 /*
962 * Update rootbp fill count: it should be the number of objects
963 * allocated in the object set (not counting the "special"
964 * objects that are stored in the objset_phys_t -- the meta
965 * dnode and user/group accounting objects).
966 */
967 bp->blk_fill = 0;
968 for (int i = 0; i < dnp->dn_nblkptr; i++)
969 bp->blk_fill += dnp->dn_blkptr[i].blk_fill;
970 }
971
972 /* ARGSUSED */
973 static void
974 dmu_objset_write_done(zio_t *zio, arc_buf_t *abuf, void *arg)
975 {
976 blkptr_t *bp = zio->io_bp;
977 blkptr_t *bp_orig = &zio->io_bp_orig;
978 objset_t *os = arg;
979
980 if (zio->io_flags & ZIO_FLAG_IO_REWRITE) {
981 ASSERT(BP_EQUAL(bp, bp_orig));
982 } else {
983 dsl_dataset_t *ds = os->os_dsl_dataset;
984 dmu_tx_t *tx = os->os_synctx;
985
986 (void) dsl_dataset_block_kill(ds, bp_orig, tx, B_TRUE);
987 dsl_dataset_block_born(ds, bp, tx);
988 }
989 }
990
991 /* called from dsl */
992 void
993 dmu_objset_sync(objset_t *os, zio_t *pio, dmu_tx_t *tx)
994 {
995 int txgoff;
996 zbookmark_t zb;
997 zio_prop_t zp;
998 zio_t *zio;
999 list_t *list;
1000 list_t *newlist = NULL;
1001 dbuf_dirty_record_t *dr;
1002
1003 dprintf_ds(os->os_dsl_dataset, "txg=%llu\n", tx->tx_txg);
1004
1005 ASSERT(dmu_tx_is_syncing(tx));
1006 /* XXX the write_done callback should really give us the tx... */
1007 os->os_synctx = tx;
1008
1009 if (os->os_dsl_dataset == NULL) {
1010 /*
1011 * This is the MOS. If we have upgraded,
1012 * spa_max_replication() could change, so reset
1013 * os_copies here.
1014 */
1015 os->os_copies = spa_max_replication(os->os_spa);
1016 }
1017
1018 /*
1019 * Create the root block IO
1020 */
1021 SET_BOOKMARK(&zb, os->os_dsl_dataset ?
1022 os->os_dsl_dataset->ds_object : DMU_META_OBJSET,
1023 ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID);
1024 arc_release(os->os_phys_buf, &os->os_phys_buf);
1025
1026 dmu_write_policy(os, NULL, 0, 0, &zp);
1027
1028 zio = arc_write(pio, os->os_spa, tx->tx_txg,
1029 os->os_rootbp, os->os_phys_buf, DMU_OS_IS_L2CACHEABLE(os),
1030 DMU_OS_IS_L2COMPRESSIBLE(os), &zp, dmu_objset_write_ready,
1031 dmu_objset_write_done, os, ZIO_PRIORITY_ASYNC_WRITE,
1032 ZIO_FLAG_MUSTSUCCEED, &zb);
1033
1034 /*
1035 * Sync special dnodes - the parent IO for the sync is the root block
1036 */
1037 DMU_META_DNODE(os)->dn_zio = zio;
1038 dnode_sync(DMU_META_DNODE(os), tx);
1039
1040 os->os_phys->os_flags = os->os_flags;
1041
1042 if (DMU_USERUSED_DNODE(os) &&
1043 DMU_USERUSED_DNODE(os)->dn_type != DMU_OT_NONE) {
1044 DMU_USERUSED_DNODE(os)->dn_zio = zio;
1045 dnode_sync(DMU_USERUSED_DNODE(os), tx);
1046 DMU_GROUPUSED_DNODE(os)->dn_zio = zio;
1047 dnode_sync(DMU_GROUPUSED_DNODE(os), tx);
1048 }
1049
1050 txgoff = tx->tx_txg & TXG_MASK;
1051
1052 if (dmu_objset_userused_enabled(os)) {
1053 newlist = &os->os_synced_dnodes;
1054 /*
1055 * We must create the list here because it uses the
1056 * dn_dirty_link[] of this txg.
1057 */
1058 list_create(newlist, sizeof (dnode_t),
1059 offsetof(dnode_t, dn_dirty_link[txgoff]));
1060 }
1061
1062 dmu_objset_sync_dnodes(&os->os_free_dnodes[txgoff], newlist, tx);
1063 dmu_objset_sync_dnodes(&os->os_dirty_dnodes[txgoff], newlist, tx);
1064
1065 list = &DMU_META_DNODE(os)->dn_dirty_records[txgoff];
1066 while (dr = list_head(list)) {
1067 ASSERT0(dr->dr_dbuf->db_level);
1068 list_remove(list, dr);
1069 if (dr->dr_zio)
1070 zio_nowait(dr->dr_zio);
1071 }
1072 /*
1073 * Free intent log blocks up to this tx.
1074 */
1075 zil_sync(os->os_zil, tx);
1076 os->os_phys->os_zil_header = os->os_zil_header;
1077 zio_nowait(zio);
1078 }
1079
1080 boolean_t
1081 dmu_objset_is_dirty(objset_t *os, uint64_t txg)
1082 {
1083 return (!list_is_empty(&os->os_dirty_dnodes[txg & TXG_MASK]) ||
1084 !list_is_empty(&os->os_free_dnodes[txg & TXG_MASK]));
1085 }
1086
1087 static objset_used_cb_t *used_cbs[DMU_OST_NUMTYPES];
1088
1089 void
1090 dmu_objset_register_type(dmu_objset_type_t ost, objset_used_cb_t *cb)
1091 {
1092 used_cbs[ost] = cb;
1093 }
1094
1095 boolean_t
1096 dmu_objset_userused_enabled(objset_t *os)
1097 {
1098 return (spa_version(os->os_spa) >= SPA_VERSION_USERSPACE &&
1099 used_cbs[os->os_phys->os_type] != NULL &&
1100 DMU_USERUSED_DNODE(os) != NULL);
1101 }
1102
1103 static void
1104 do_userquota_update(objset_t *os, uint64_t used, uint64_t flags,
1105 uint64_t user, uint64_t group, boolean_t subtract, dmu_tx_t *tx)
1106 {
1107 if ((flags & DNODE_FLAG_USERUSED_ACCOUNTED)) {
1108 int64_t delta = DNODE_SIZE + used;
1109 if (subtract)
1110 delta = -delta;
1111 VERIFY3U(0, ==, zap_increment_int(os, DMU_USERUSED_OBJECT,
1112 user, delta, tx));
1113 VERIFY3U(0, ==, zap_increment_int(os, DMU_GROUPUSED_OBJECT,
1114 group, delta, tx));
1115 }
1116 }
1117
1118 void
1119 dmu_objset_do_userquota_updates(objset_t *os, dmu_tx_t *tx)
1120 {
1121 dnode_t *dn;
1122 list_t *list = &os->os_synced_dnodes;
1123
1124 ASSERT(list_head(list) == NULL || dmu_objset_userused_enabled(os));
1125
1126 while (dn = list_head(list)) {
1127 int flags;
1128 ASSERT(!DMU_OBJECT_IS_SPECIAL(dn->dn_object));
1129 ASSERT(dn->dn_phys->dn_type == DMU_OT_NONE ||
1130 dn->dn_phys->dn_flags &
1131 DNODE_FLAG_USERUSED_ACCOUNTED);
1132
1133 /* Allocate the user/groupused objects if necessary. */
1134 if (DMU_USERUSED_DNODE(os)->dn_type == DMU_OT_NONE) {
1135 VERIFY(0 == zap_create_claim(os,
1136 DMU_USERUSED_OBJECT,
1137 DMU_OT_USERGROUP_USED, DMU_OT_NONE, 0, tx));
1138 VERIFY(0 == zap_create_claim(os,
1139 DMU_GROUPUSED_OBJECT,
1140 DMU_OT_USERGROUP_USED, DMU_OT_NONE, 0, tx));
1141 }
1142
1143 /*
1144 * We intentionally modify the zap object even if the
1145 * net delta is zero. Otherwise
1146 * the block of the zap obj could be shared between
1147 * datasets but need to be different between them after
1148 * a bprewrite.
1149 */
1150
1151 flags = dn->dn_id_flags;
1152 ASSERT(flags);
1153 if (flags & DN_ID_OLD_EXIST) {
1154 do_userquota_update(os, dn->dn_oldused, dn->dn_oldflags,
1155 dn->dn_olduid, dn->dn_oldgid, B_TRUE, tx);
1156 }
1157 if (flags & DN_ID_NEW_EXIST) {
1158 do_userquota_update(os, DN_USED_BYTES(dn->dn_phys),
1159 dn->dn_phys->dn_flags, dn->dn_newuid,
1160 dn->dn_newgid, B_FALSE, tx);
1161 }
1162
1163 mutex_enter(&dn->dn_mtx);
1164 dn->dn_oldused = 0;
1165 dn->dn_oldflags = 0;
1166 if (dn->dn_id_flags & DN_ID_NEW_EXIST) {
1167 dn->dn_olduid = dn->dn_newuid;
1168 dn->dn_oldgid = dn->dn_newgid;
1169 dn->dn_id_flags |= DN_ID_OLD_EXIST;
1170 if (dn->dn_bonuslen == 0)
1171 dn->dn_id_flags |= DN_ID_CHKED_SPILL;
1172 else
1173 dn->dn_id_flags |= DN_ID_CHKED_BONUS;
1174 }
1175 dn->dn_id_flags &= ~(DN_ID_NEW_EXIST);
1176 mutex_exit(&dn->dn_mtx);
1177
1178 list_remove(list, dn);
1179 dnode_rele(dn, list);
1180 }
1181 }
1182
1183 /*
1184 * Returns a pointer to data to find uid/gid from
1185 *
1186 * If a dirty record for transaction group that is syncing can't
1187 * be found then NULL is returned. In the NULL case it is assumed
1188 * the uid/gid aren't changing.
1189 */
1190 static void *
1191 dmu_objset_userquota_find_data(dmu_buf_impl_t *db, dmu_tx_t *tx)
1192 {
1193 dbuf_dirty_record_t *dr, **drp;
1194 void *data;
1195
1196 if (db->db_dirtycnt == 0)
1197 return (db->db.db_data); /* Nothing is changing */
1198
1199 for (drp = &db->db_last_dirty; (dr = *drp) != NULL; drp = &dr->dr_next)
1200 if (dr->dr_txg == tx->tx_txg)
1201 break;
1202
1203 if (dr == NULL) {
1204 data = NULL;
1205 } else {
1206 dnode_t *dn;
1207
1208 DB_DNODE_ENTER(dr->dr_dbuf);
1209 dn = DB_DNODE(dr->dr_dbuf);
1210
1211 if (dn->dn_bonuslen == 0 &&
1212 dr->dr_dbuf->db_blkid == DMU_SPILL_BLKID)
1213 data = dr->dt.dl.dr_data->b_data;
1214 else
1215 data = dr->dt.dl.dr_data;
1216
1217 DB_DNODE_EXIT(dr->dr_dbuf);
1218 }
1219
1220 return (data);
1221 }
1222
1223 void
1224 dmu_objset_userquota_get_ids(dnode_t *dn, boolean_t before, dmu_tx_t *tx)
1225 {
1226 objset_t *os = dn->dn_objset;
1227 void *data = NULL;
1228 dmu_buf_impl_t *db = NULL;
1229 uint64_t *user = NULL;
1230 uint64_t *group = NULL;
1231 int flags = dn->dn_id_flags;
1232 int error;
1233 boolean_t have_spill = B_FALSE;
1234
1235 if (!dmu_objset_userused_enabled(dn->dn_objset))
1236 return;
1237
1238 if (before && (flags & (DN_ID_CHKED_BONUS|DN_ID_OLD_EXIST|
1239 DN_ID_CHKED_SPILL)))
1240 return;
1241
1242 if (before && dn->dn_bonuslen != 0)
1243 data = DN_BONUS(dn->dn_phys);
1244 else if (!before && dn->dn_bonuslen != 0) {
1245 if (dn->dn_bonus) {
1246 db = dn->dn_bonus;
1247 mutex_enter(&db->db_mtx);
1248 data = dmu_objset_userquota_find_data(db, tx);
1249 } else {
1250 data = DN_BONUS(dn->dn_phys);
1251 }
1252 } else if (dn->dn_bonuslen == 0 && dn->dn_bonustype == DMU_OT_SA) {
1253 int rf = 0;
1254
1255 if (RW_WRITE_HELD(&dn->dn_struct_rwlock))
1256 rf |= DB_RF_HAVESTRUCT;
1257 error = dmu_spill_hold_by_dnode(dn,
1258 rf | DB_RF_MUST_SUCCEED,
1259 FTAG, (dmu_buf_t **)&db);
1260 ASSERT(error == 0);
1261 mutex_enter(&db->db_mtx);
1262 data = (before) ? db->db.db_data :
1263 dmu_objset_userquota_find_data(db, tx);
1264 have_spill = B_TRUE;
1265 } else {
1266 mutex_enter(&dn->dn_mtx);
1267 dn->dn_id_flags |= DN_ID_CHKED_BONUS;
1268 mutex_exit(&dn->dn_mtx);
1269 return;
1270 }
1271
1272 if (before) {
1273 ASSERT(data);
1274 user = &dn->dn_olduid;
1275 group = &dn->dn_oldgid;
1276 } else if (data) {
1277 user = &dn->dn_newuid;
1278 group = &dn->dn_newgid;
1279 }
1280
1281 /*
1282 * Must always call the callback in case the object
1283 * type has changed and that type isn't an object type to track
1284 */
1285 error = used_cbs[os->os_phys->os_type](dn->dn_bonustype, data,
1286 user, group);
1287
1288 /*
1289 * Preserve existing uid/gid when the callback can't determine
1290 * what the new uid/gid are and the callback returned EEXIST.
1291 * The EEXIST error tells us to just use the existing uid/gid.
1292 * If we don't know what the old values are then just assign
1293 * them to 0, since that is a new file being created.
1294 */
1295 if (!before && data == NULL && error == EEXIST) {
1296 if (flags & DN_ID_OLD_EXIST) {
1297 dn->dn_newuid = dn->dn_olduid;
1298 dn->dn_newgid = dn->dn_oldgid;
1299 } else {
1300 dn->dn_newuid = 0;
1301 dn->dn_newgid = 0;
1302 }
1303 error = 0;
1304 }
1305
1306 if (db)
1307 mutex_exit(&db->db_mtx);
1308
1309 mutex_enter(&dn->dn_mtx);
1310 if (error == 0 && before)
1311 dn->dn_id_flags |= DN_ID_OLD_EXIST;
1312 if (error == 0 && !before)
1313 dn->dn_id_flags |= DN_ID_NEW_EXIST;
1314
1315 if (have_spill) {
1316 dn->dn_id_flags |= DN_ID_CHKED_SPILL;
1317 } else {
1318 dn->dn_id_flags |= DN_ID_CHKED_BONUS;
1319 }
1320 mutex_exit(&dn->dn_mtx);
1321 if (have_spill)
1322 dmu_buf_rele((dmu_buf_t *)db, FTAG);
1323 }
1324
1325 boolean_t
1326 dmu_objset_userspace_present(objset_t *os)
1327 {
1328 return (os->os_phys->os_flags &
1329 OBJSET_FLAG_USERACCOUNTING_COMPLETE);
1330 }
1331
1332 int
1333 dmu_objset_userspace_upgrade(objset_t *os)
1334 {
1335 uint64_t obj;
1336 int err = 0;
1337
1338 if (dmu_objset_userspace_present(os))
1339 return (0);
1340 if (!dmu_objset_userused_enabled(os))
1341 return (SET_ERROR(ENOTSUP));
1342 if (dmu_objset_is_snapshot(os))
1343 return (SET_ERROR(EINVAL));
1344
1345 /*
1346 * We simply need to mark every object dirty, so that it will be
1347 * synced out and now accounted. If this is called
1348 * concurrently, or if we already did some work before crashing,
1349 * that's fine, since we track each object's accounted state
1350 * independently.
1351 */
1352
1353 for (obj = 0; err == 0; err = dmu_object_next(os, &obj, FALSE, 0)) {
1354 dmu_tx_t *tx;
1355 dmu_buf_t *db;
1356 int objerr;
1357
1358 if (issig(JUSTLOOKING) && issig(FORREAL))
1359 return (SET_ERROR(EINTR));
1360
1361 objerr = dmu_bonus_hold(os, obj, FTAG, &db);
1362 if (objerr != 0)
1363 continue;
1364 tx = dmu_tx_create(os);
1365 dmu_tx_hold_bonus(tx, obj);
1366 objerr = dmu_tx_assign(tx, TXG_WAIT);
1367 if (objerr != 0) {
1368 dmu_tx_abort(tx);
1369 continue;
1370 }
1371 dmu_buf_will_dirty(db, tx);
1372 dmu_buf_rele(db, FTAG);
1373 dmu_tx_commit(tx);
1374 }
1375
1376 os->os_flags |= OBJSET_FLAG_USERACCOUNTING_COMPLETE;
1377 txg_wait_synced(dmu_objset_pool(os), 0);
1378 return (0);
1379 }
1380
1381 void
1382 dmu_objset_space(objset_t *os, uint64_t *refdbytesp, uint64_t *availbytesp,
1383 uint64_t *usedobjsp, uint64_t *availobjsp)
1384 {
1385 dsl_dataset_space(os->os_dsl_dataset, refdbytesp, availbytesp,
1386 usedobjsp, availobjsp);
1387 }
1388
1389 uint64_t
1390 dmu_objset_fsid_guid(objset_t *os)
1391 {
1392 return (dsl_dataset_fsid_guid(os->os_dsl_dataset));
1393 }
1394
1395 void
1396 dmu_objset_fast_stat(objset_t *os, dmu_objset_stats_t *stat)
1397 {
1398 stat->dds_type = os->os_phys->os_type;
1399 if (os->os_dsl_dataset)
1400 dsl_dataset_fast_stat(os->os_dsl_dataset, stat);
1401 }
1402
1403 void
1404 dmu_objset_stats(objset_t *os, nvlist_t *nv)
1405 {
1406 ASSERT(os->os_dsl_dataset ||
1407 os->os_phys->os_type == DMU_OST_META);
1408
1409 if (os->os_dsl_dataset != NULL)
1410 dsl_dataset_stats(os->os_dsl_dataset, nv);
1411
1412 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_TYPE,
1413 os->os_phys->os_type);
1414 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERACCOUNTING,
1415 dmu_objset_userspace_present(os));
1416 }
1417
1418 int
1419 dmu_objset_is_snapshot(objset_t *os)
1420 {
1421 if (os->os_dsl_dataset != NULL)
1422 return (dsl_dataset_is_snapshot(os->os_dsl_dataset));
1423 else
1424 return (B_FALSE);
1425 }
1426
1427 int
1428 dmu_snapshot_realname(objset_t *os, char *name, char *real, int maxlen,
1429 boolean_t *conflict)
1430 {
1431 dsl_dataset_t *ds = os->os_dsl_dataset;
1432 uint64_t ignored;
1433
1434 if (ds->ds_phys->ds_snapnames_zapobj == 0)
1435 return (SET_ERROR(ENOENT));
1436
1437 return (zap_lookup_norm(ds->ds_dir->dd_pool->dp_meta_objset,
1438 ds->ds_phys->ds_snapnames_zapobj, name, 8, 1, &ignored, MT_FIRST,
1439 real, maxlen, conflict));
1440 }
1441
1442 int
1443 dmu_snapshot_list_next(objset_t *os, int namelen, char *name,
1444 uint64_t *idp, uint64_t *offp, boolean_t *case_conflict)
1445 {
1446 dsl_dataset_t *ds = os->os_dsl_dataset;
1447 zap_cursor_t cursor;
1448 zap_attribute_t attr;
1449
1450 ASSERT(dsl_pool_config_held(dmu_objset_pool(os)));
1451
1452 if (ds->ds_phys->ds_snapnames_zapobj == 0)
1453 return (SET_ERROR(ENOENT));
1454
1455 zap_cursor_init_serialized(&cursor,
1456 ds->ds_dir->dd_pool->dp_meta_objset,
1457 ds->ds_phys->ds_snapnames_zapobj, *offp);
1458
1459 if (zap_cursor_retrieve(&cursor, &attr) != 0) {
1460 zap_cursor_fini(&cursor);
1461 return (SET_ERROR(ENOENT));
1462 }
1463
1464 if (strlen(attr.za_name) + 1 > namelen) {
1465 zap_cursor_fini(&cursor);
1466 return (SET_ERROR(ENAMETOOLONG));
1467 }
1468
1469 (void) strcpy(name, attr.za_name);
1470 if (idp)
1471 *idp = attr.za_first_integer;
1472 if (case_conflict)
1473 *case_conflict = attr.za_normalization_conflict;
1474 zap_cursor_advance(&cursor);
1475 *offp = zap_cursor_serialize(&cursor);
1476 zap_cursor_fini(&cursor);
1477
1478 return (0);
1479 }
1480
1481 int
1482 dmu_dir_list_next(objset_t *os, int namelen, char *name,
1483 uint64_t *idp, uint64_t *offp)
1484 {
1485 dsl_dir_t *dd = os->os_dsl_dataset->ds_dir;
1486 zap_cursor_t cursor;
1487 zap_attribute_t attr;
1488
1489 /* there is no next dir on a snapshot! */
1490 if (os->os_dsl_dataset->ds_object !=
1491 dd->dd_phys->dd_head_dataset_obj)
1492 return (SET_ERROR(ENOENT));
1493
1494 zap_cursor_init_serialized(&cursor,
1495 dd->dd_pool->dp_meta_objset,
1496 dd->dd_phys->dd_child_dir_zapobj, *offp);
1497
1498 if (zap_cursor_retrieve(&cursor, &attr) != 0) {
1499 zap_cursor_fini(&cursor);
1500 return (SET_ERROR(ENOENT));
1501 }
1502
1503 if (strlen(attr.za_name) + 1 > namelen) {
1504 zap_cursor_fini(&cursor);
1505 return (SET_ERROR(ENAMETOOLONG));
1506 }
1507
1508 (void) strcpy(name, attr.za_name);
1509 if (idp)
1510 *idp = attr.za_first_integer;
1511 zap_cursor_advance(&cursor);
1512 *offp = zap_cursor_serialize(&cursor);
1513 zap_cursor_fini(&cursor);
1514
1515 return (0);
1516 }
1517
1518 /*
1519 * Find objsets under and including ddobj, call func(ds) on each.
1520 */
1521 int
1522 dmu_objset_find_dp(dsl_pool_t *dp, uint64_t ddobj,
1523 int func(dsl_pool_t *, dsl_dataset_t *, void *), void *arg, int flags)
1524 {
1525 dsl_dir_t *dd;
1526 dsl_dataset_t *ds;
1527 zap_cursor_t zc;
1528 zap_attribute_t *attr;
1529 uint64_t thisobj;
1530 int err;
1531
1532 ASSERT(dsl_pool_config_held(dp));
1533
1534 err = dsl_dir_hold_obj(dp, ddobj, NULL, FTAG, &dd);
1535 if (err != 0)
1536 return (err);
1537
1538 /* Don't visit hidden ($MOS & $ORIGIN) objsets. */
1539 if (dd->dd_myname[0] == '$') {
1540 dsl_dir_rele(dd, FTAG);
1541 return (0);
1542 }
1543
1544 thisobj = dd->dd_phys->dd_head_dataset_obj;
1545 attr = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP);
1546
1547 /*
1548 * Iterate over all children.
1549 */
1550 if (flags & DS_FIND_CHILDREN) {
1551 for (zap_cursor_init(&zc, dp->dp_meta_objset,
1552 dd->dd_phys->dd_child_dir_zapobj);
1553 zap_cursor_retrieve(&zc, attr) == 0;
1554 (void) zap_cursor_advance(&zc)) {
1555 ASSERT3U(attr->za_integer_length, ==,
1556 sizeof (uint64_t));
1557 ASSERT3U(attr->za_num_integers, ==, 1);
1558
1559 err = dmu_objset_find_dp(dp, attr->za_first_integer,
1560 func, arg, flags);
1561 if (err != 0)
1562 break;
1563 }
1564 zap_cursor_fini(&zc);
1565
1566 if (err != 0) {
1567 dsl_dir_rele(dd, FTAG);
1568 kmem_free(attr, sizeof (zap_attribute_t));
1569 return (err);
1570 }
1571 }
1572
1573 /*
1574 * Iterate over all snapshots.
1575 */
1576 if (flags & DS_FIND_SNAPSHOTS) {
1577 dsl_dataset_t *ds;
1578 err = dsl_dataset_hold_obj(dp, thisobj, FTAG, &ds);
1579
1580 if (err == 0) {
1581 uint64_t snapobj = ds->ds_phys->ds_snapnames_zapobj;
1582 dsl_dataset_rele(ds, FTAG);
1583
1584 for (zap_cursor_init(&zc, dp->dp_meta_objset, snapobj);
1585 zap_cursor_retrieve(&zc, attr) == 0;
1586 (void) zap_cursor_advance(&zc)) {
1587 ASSERT3U(attr->za_integer_length, ==,
1588 sizeof (uint64_t));
1589 ASSERT3U(attr->za_num_integers, ==, 1);
1590
1591 err = dsl_dataset_hold_obj(dp,
1592 attr->za_first_integer, FTAG, &ds);
1593 if (err != 0)
1594 break;
1595 err = func(dp, ds, arg);
1596 dsl_dataset_rele(ds, FTAG);
1597 if (err != 0)
1598 break;
1599 }
1600 zap_cursor_fini(&zc);
1601 }
1602 }
1603
1604 dsl_dir_rele(dd, FTAG);
1605 kmem_free(attr, sizeof (zap_attribute_t));
1606
1607 if (err != 0)
1608 return (err);
1609
1610 /*
1611 * Apply to self.
1612 */
1613 err = dsl_dataset_hold_obj(dp, thisobj, FTAG, &ds);
1614 if (err != 0)
1615 return (err);
1616 err = func(dp, ds, arg);
1617 dsl_dataset_rele(ds, FTAG);
1618 return (err);
1619 }
1620
1621 /*
1622 * Find all objsets under name, and for each, call 'func(child_name, arg)'.
1623 * The dp_config_rwlock must not be held when this is called, and it
1624 * will not be held when the callback is called.
1625 * Therefore this function should only be used when the pool is not changing
1626 * (e.g. in syncing context), or the callback can deal with the possible races.
1627 */
1628 static int
1629 dmu_objset_find_impl(spa_t *spa, const char *name,
1630 int func(const char *, void *), void *arg, int flags)
1631 {
1632 dsl_dir_t *dd;
1633 dsl_pool_t *dp = spa_get_dsl(spa);
1634 dsl_dataset_t *ds;
1635 zap_cursor_t zc;
1636 zap_attribute_t *attr;
1637 char *child;
1638 uint64_t thisobj;
1639 int err;
1640
1641 dsl_pool_config_enter(dp, FTAG);
1642
1643 err = dsl_dir_hold(dp, name, FTAG, &dd, NULL);
1644 if (err != 0) {
1645 dsl_pool_config_exit(dp, FTAG);
1646 return (err);
1647 }
1648
1649 /* Don't visit hidden ($MOS & $ORIGIN) objsets. */
1650 if (dd->dd_myname[0] == '$') {
1651 dsl_dir_rele(dd, FTAG);
1652 dsl_pool_config_exit(dp, FTAG);
1653 return (0);
1654 }
1655
1656 thisobj = dd->dd_phys->dd_head_dataset_obj;
1657 attr = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP);
1658
1659 /*
1660 * Iterate over all children.
1661 */
1662 if (flags & DS_FIND_CHILDREN) {
1663 for (zap_cursor_init(&zc, dp->dp_meta_objset,
1664 dd->dd_phys->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 = kmem_asprintf("%s/%s", name, attr->za_name);
1672 dsl_pool_config_exit(dp, FTAG);
1673 err = dmu_objset_find_impl(spa, child,
1674 func, arg, flags);
1675 dsl_pool_config_enter(dp, FTAG);
1676 strfree(child);
1677 if (err != 0)
1678 break;
1679 }
1680 zap_cursor_fini(&zc);
1681
1682 if (err != 0) {
1683 dsl_dir_rele(dd, FTAG);
1684 dsl_pool_config_exit(dp, FTAG);
1685 kmem_free(attr, sizeof (zap_attribute_t));
1686 return (err);
1687 }
1688 }
1689
1690 /*
1691 * Iterate over all snapshots.
1692 */
1693 if (flags & DS_FIND_SNAPSHOTS) {
1694 err = dsl_dataset_hold_obj(dp, thisobj, FTAG, &ds);
1695
1696 if (err == 0) {
1697 uint64_t snapobj = ds->ds_phys->ds_snapnames_zapobj;
1698 dsl_dataset_rele(ds, FTAG);
1699
1700 for (zap_cursor_init(&zc, dp->dp_meta_objset, snapobj);
1701 zap_cursor_retrieve(&zc, attr) == 0;
1702 (void) zap_cursor_advance(&zc)) {
1703 ASSERT3U(attr->za_integer_length, ==,
1704 sizeof (uint64_t));
1705 ASSERT3U(attr->za_num_integers, ==, 1);
1706
1707 child = kmem_asprintf("%s@%s",
1708 name, attr->za_name);
1709 dsl_pool_config_exit(dp, FTAG);
1710 err = func(child, arg);
1711 dsl_pool_config_enter(dp, FTAG);
1712 strfree(child);
1713 if (err != 0)
1714 break;
1715 }
1716 zap_cursor_fini(&zc);
1717 }
1718 }
1719
1720 dsl_dir_rele(dd, FTAG);
1721 kmem_free(attr, sizeof (zap_attribute_t));
1722 dsl_pool_config_exit(dp, FTAG);
1723
1724 if (err != 0)
1725 return (err);
1726
1727 /* Apply to self. */
1728 return (func(name, arg));
1729 }
1730
1731 /*
1732 * See comment above dmu_objset_find_impl().
1733 */
1734 int
1735 dmu_objset_find(char *name, int func(const char *, void *), void *arg,
1736 int flags)
1737 {
1738 spa_t *spa;
1739 int error;
1740
1741 error = spa_open(name, &spa, FTAG);
1742 if (error != 0)
1743 return (error);
1744 error = dmu_objset_find_impl(spa, name, func, arg, flags);
1745 spa_close(spa, FTAG);
1746 return (error);
1747 }
1748
1749 void
1750 dmu_objset_set_user(objset_t *os, void *user_ptr)
1751 {
1752 ASSERT(MUTEX_HELD(&os->os_user_ptr_lock));
1753 os->os_user_ptr = user_ptr;
1754 }
1755
1756 void *
1757 dmu_objset_get_user(objset_t *os)
1758 {
1759 ASSERT(MUTEX_HELD(&os->os_user_ptr_lock));
1760 return (os->os_user_ptr);
1761 }
1762
1763 /*
1764 * Determine name of filesystem, given name of snapshot.
1765 * buf must be at least MAXNAMELEN bytes
1766 */
1767 int
1768 dmu_fsname(const char *snapname, char *buf)
1769 {
1770 char *atp = strchr(snapname, '@');
1771 if (atp == NULL)
1772 return (SET_ERROR(EINVAL));
1773 if (atp - snapname >= MAXNAMELEN)
1774 return (SET_ERROR(ENAMETOOLONG));
1775 (void) strlcpy(buf, snapname, atp - snapname + 1);
1776 return (0);
1777 }