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 by Delphix. All rights reserved.
24 */
25
26 /* Portions Copyright 2010 Robert Milkowski */
27
28 #include <sys/cred.h>
29 #include <sys/zfs_context.h>
30 #include <sys/dmu_objset.h>
31 #include <sys/dsl_dir.h>
32 #include <sys/dsl_dataset.h>
33 #include <sys/dsl_prop.h>
34 #include <sys/dsl_pool.h>
35 #include <sys/dsl_synctask.h>
36 #include <sys/dsl_deleg.h>
37 #include <sys/dnode.h>
38 #include <sys/dbuf.h>
39 #include <sys/zvol.h>
40 #include <sys/dmu_tx.h>
41 #include <sys/zap.h>
42 #include <sys/zil.h>
43 #include <sys/dmu_impl.h>
44 #include <sys/zfs_ioctl.h>
45 #include <sys/sa.h>
46 #include <sys/zfs_onexit.h>
47
48 /*
49 * Needed to close a window in dnode_move() that allows the objset to be freed
50 * before it can be safely accessed.
51 */
52 krwlock_t os_lock;
53
54 void
55 dmu_objset_init(void)
56 {
57 rw_init(&os_lock, NULL, RW_DEFAULT, NULL);
58 }
59
60 void
61 dmu_objset_fini(void)
62 {
63 rw_destroy(&os_lock);
64 }
65
66 spa_t *
67 dmu_objset_spa(objset_t *os)
68 {
69 return (os->os_spa);
70 }
71
72 zilog_t *
73 dmu_objset_zil(objset_t *os)
74 {
75 return (os->os_zil);
76 }
77
78 dsl_pool_t *
79 dmu_objset_pool(objset_t *os)
80 {
81 dsl_dataset_t *ds;
82
83 if ((ds = os->os_dsl_dataset) != NULL && ds->ds_dir)
84 return (ds->ds_dir->dd_pool);
85 else
86 return (spa_get_dsl(os->os_spa));
87 }
88
89 dsl_dataset_t *
90 dmu_objset_ds(objset_t *os)
91 {
92 return (os->os_dsl_dataset);
93 }
94
95 dmu_objset_type_t
96 dmu_objset_type(objset_t *os)
97 {
98 return (os->os_phys->os_type);
99 }
100
101 void
102 dmu_objset_name(objset_t *os, char *buf)
103 {
104 dsl_dataset_name(os->os_dsl_dataset, buf);
105 }
106
107 uint64_t
108 dmu_objset_id(objset_t *os)
109 {
110 dsl_dataset_t *ds = os->os_dsl_dataset;
111
112 return (ds ? ds->ds_object : 0);
113 }
114
115 uint64_t
116 dmu_objset_syncprop(objset_t *os)
117 {
118 return (os->os_sync);
119 }
120
121 uint64_t
122 dmu_objset_logbias(objset_t *os)
123 {
124 return (os->os_logbias);
125 }
126
127 static void
128 checksum_changed_cb(void *arg, uint64_t newval)
129 {
130 objset_t *os = arg;
131
132 /*
133 * Inheritance should have been done by now.
134 */
135 ASSERT(newval != ZIO_CHECKSUM_INHERIT);
136
137 os->os_checksum = zio_checksum_select(newval, ZIO_CHECKSUM_ON_VALUE);
138 }
139
140 static void
141 compression_changed_cb(void *arg, uint64_t newval)
142 {
143 objset_t *os = arg;
144
145 /*
146 * Inheritance and range checking should have been done by now.
147 */
148 ASSERT(newval != ZIO_COMPRESS_INHERIT);
149
150 os->os_compress = zio_compress_select(newval, ZIO_COMPRESS_ON_VALUE);
151 }
152
153 static void
154 copies_changed_cb(void *arg, uint64_t newval)
155 {
156 objset_t *os = arg;
157
158 /*
159 * Inheritance and range checking should have been done by now.
160 */
161 ASSERT(newval > 0);
162 ASSERT(newval <= spa_max_replication(os->os_spa));
163
164 os->os_copies = newval;
165 }
166
167 static void
168 dedup_changed_cb(void *arg, uint64_t newval)
169 {
170 objset_t *os = arg;
171 spa_t *spa = os->os_spa;
172 enum zio_checksum checksum;
173
174 /*
175 * Inheritance should have been done by now.
176 */
177 ASSERT(newval != ZIO_CHECKSUM_INHERIT);
178
179 checksum = zio_checksum_dedup_select(spa, newval, ZIO_CHECKSUM_OFF);
180
181 os->os_dedup_checksum = checksum & ZIO_CHECKSUM_MASK;
182 os->os_dedup_verify = !!(checksum & ZIO_CHECKSUM_VERIFY);
183 }
184
185 static void
186 primary_cache_changed_cb(void *arg, uint64_t newval)
187 {
188 objset_t *os = arg;
189
190 /*
191 * Inheritance and range checking should have been done by now.
192 */
193 ASSERT(newval == ZFS_CACHE_ALL || newval == ZFS_CACHE_NONE ||
194 newval == ZFS_CACHE_METADATA);
195
196 os->os_primary_cache = newval;
197 }
198
199 static void
200 secondary_cache_changed_cb(void *arg, uint64_t newval)
201 {
202 objset_t *os = arg;
203
204 /*
205 * Inheritance and range checking should have been done by now.
206 */
207 ASSERT(newval == ZFS_CACHE_ALL || newval == ZFS_CACHE_NONE ||
208 newval == ZFS_CACHE_METADATA);
209
210 os->os_secondary_cache = newval;
211 }
212
213 static void
214 sync_changed_cb(void *arg, uint64_t newval)
215 {
216 objset_t *os = arg;
217
218 /*
219 * Inheritance and range checking should have been done by now.
220 */
221 ASSERT(newval == ZFS_SYNC_STANDARD || newval == ZFS_SYNC_ALWAYS ||
222 newval == ZFS_SYNC_DISABLED);
223
224 os->os_sync = newval;
225 if (os->os_zil)
226 zil_set_sync(os->os_zil, newval);
227 }
228
229 static void
230 logbias_changed_cb(void *arg, uint64_t newval)
231 {
232 objset_t *os = arg;
233
234 ASSERT(newval == ZFS_LOGBIAS_LATENCY ||
235 newval == ZFS_LOGBIAS_THROUGHPUT);
236 os->os_logbias = newval;
237 if (os->os_zil)
238 zil_set_logbias(os->os_zil, newval);
239 }
240
241 void
242 dmu_objset_byteswap(void *buf, size_t size)
243 {
244 objset_phys_t *osp = buf;
245
246 ASSERT(size == OBJSET_OLD_PHYS_SIZE || size == sizeof (objset_phys_t));
247 dnode_byteswap(&osp->os_meta_dnode);
248 byteswap_uint64_array(&osp->os_zil_header, sizeof (zil_header_t));
249 osp->os_type = BSWAP_64(osp->os_type);
250 osp->os_flags = BSWAP_64(osp->os_flags);
251 if (size == sizeof (objset_phys_t)) {
252 dnode_byteswap(&osp->os_userused_dnode);
253 dnode_byteswap(&osp->os_groupused_dnode);
254 }
255 }
256
257 int
258 dmu_objset_open_impl(spa_t *spa, dsl_dataset_t *ds, blkptr_t *bp,
259 objset_t **osp)
260 {
261 objset_t *os;
262 int i, err;
263
264 ASSERT(ds == NULL || MUTEX_HELD(&ds->ds_opening_lock));
265
266 os = kmem_zalloc(sizeof (objset_t), KM_SLEEP);
267 os->os_dsl_dataset = ds;
268 os->os_spa = spa;
269 os->os_rootbp = bp;
270 if (!BP_IS_HOLE(os->os_rootbp)) {
271 uint32_t aflags = ARC_WAIT;
272 zbookmark_t zb;
273 SET_BOOKMARK(&zb, ds ? ds->ds_object : DMU_META_OBJSET,
274 ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID);
275
276 if (DMU_OS_IS_L2CACHEABLE(os))
277 aflags |= ARC_L2CACHE;
278
279 dprintf_bp(os->os_rootbp, "reading %s", "");
280 /*
281 * XXX when bprewrite scrub can change the bp,
282 * and this is called from dmu_objset_open_ds_os, the bp
283 * could change, and we'll need a lock.
284 */
285 err = dsl_read_nolock(NULL, spa, os->os_rootbp,
286 arc_getbuf_func, &os->os_phys_buf,
287 ZIO_PRIORITY_SYNC_READ, ZIO_FLAG_CANFAIL, &aflags, &zb);
288 if (err) {
289 kmem_free(os, sizeof (objset_t));
290 /* convert checksum errors into IO errors */
291 if (err == ECKSUM)
292 err = EIO;
293 return (err);
294 }
295
296 /* Increase the blocksize if we are permitted. */
297 if (spa_version(spa) >= SPA_VERSION_USERSPACE &&
298 arc_buf_size(os->os_phys_buf) < sizeof (objset_phys_t)) {
299 arc_buf_t *buf = arc_buf_alloc(spa,
300 sizeof (objset_phys_t), &os->os_phys_buf,
301 ARC_BUFC_METADATA);
302 bzero(buf->b_data, sizeof (objset_phys_t));
303 bcopy(os->os_phys_buf->b_data, buf->b_data,
304 arc_buf_size(os->os_phys_buf));
305 (void) arc_buf_remove_ref(os->os_phys_buf,
306 &os->os_phys_buf);
307 os->os_phys_buf = buf;
308 }
309
310 os->os_phys = os->os_phys_buf->b_data;
311 os->os_flags = os->os_phys->os_flags;
312 } else {
313 int size = spa_version(spa) >= SPA_VERSION_USERSPACE ?
314 sizeof (objset_phys_t) : OBJSET_OLD_PHYS_SIZE;
315 os->os_phys_buf = arc_buf_alloc(spa, size,
316 &os->os_phys_buf, ARC_BUFC_METADATA);
317 os->os_phys = os->os_phys_buf->b_data;
318 bzero(os->os_phys, size);
319 }
320
321 /*
322 * Note: the changed_cb will be called once before the register
323 * func returns, thus changing the checksum/compression from the
324 * default (fletcher2/off). Snapshots don't need to know about
325 * checksum/compression/copies.
326 */
327 if (ds) {
328 err = dsl_prop_register(ds, "primarycache",
329 primary_cache_changed_cb, os);
330 if (err == 0)
331 err = dsl_prop_register(ds, "secondarycache",
332 secondary_cache_changed_cb, os);
333 if (!dsl_dataset_is_snapshot(ds)) {
334 if (err == 0)
335 err = dsl_prop_register(ds, "checksum",
336 checksum_changed_cb, os);
337 if (err == 0)
338 err = dsl_prop_register(ds, "compression",
339 compression_changed_cb, os);
340 if (err == 0)
341 err = dsl_prop_register(ds, "copies",
342 copies_changed_cb, os);
343 if (err == 0)
344 err = dsl_prop_register(ds, "dedup",
345 dedup_changed_cb, os);
346 if (err == 0)
347 err = dsl_prop_register(ds, "logbias",
348 logbias_changed_cb, os);
349 if (err == 0)
350 err = dsl_prop_register(ds, "sync",
351 sync_changed_cb, os);
352 }
353 if (err) {
354 VERIFY(arc_buf_remove_ref(os->os_phys_buf,
355 &os->os_phys_buf) == 1);
356 kmem_free(os, sizeof (objset_t));
357 return (err);
358 }
359 } else if (ds == NULL) {
360 /* It's the meta-objset. */
361 os->os_checksum = ZIO_CHECKSUM_FLETCHER_4;
362 os->os_compress = ZIO_COMPRESS_LZJB;
363 os->os_copies = spa_max_replication(spa);
364 os->os_dedup_checksum = ZIO_CHECKSUM_OFF;
365 os->os_dedup_verify = 0;
366 os->os_logbias = 0;
367 os->os_sync = 0;
368 os->os_primary_cache = ZFS_CACHE_ALL;
369 os->os_secondary_cache = ZFS_CACHE_ALL;
370 }
371
372 if (ds == NULL || !dsl_dataset_is_snapshot(ds))
373 os->os_zil_header = os->os_phys->os_zil_header;
374 os->os_zil = zil_alloc(os, &os->os_zil_header);
375
376 for (i = 0; i < TXG_SIZE; i++) {
377 list_create(&os->os_dirty_dnodes[i], sizeof (dnode_t),
378 offsetof(dnode_t, dn_dirty_link[i]));
379 list_create(&os->os_free_dnodes[i], sizeof (dnode_t),
380 offsetof(dnode_t, dn_dirty_link[i]));
381 }
382 list_create(&os->os_dnodes, sizeof (dnode_t),
383 offsetof(dnode_t, dn_link));
384 list_create(&os->os_downgraded_dbufs, sizeof (dmu_buf_impl_t),
385 offsetof(dmu_buf_impl_t, db_link));
386
387 mutex_init(&os->os_lock, NULL, MUTEX_DEFAULT, NULL);
388 mutex_init(&os->os_obj_lock, NULL, MUTEX_DEFAULT, NULL);
389 mutex_init(&os->os_user_ptr_lock, NULL, MUTEX_DEFAULT, NULL);
390
391 DMU_META_DNODE(os) = dnode_special_open(os,
392 &os->os_phys->os_meta_dnode, DMU_META_DNODE_OBJECT,
393 &os->os_meta_dnode);
394 if (arc_buf_size(os->os_phys_buf) >= sizeof (objset_phys_t)) {
395 DMU_USERUSED_DNODE(os) = dnode_special_open(os,
396 &os->os_phys->os_userused_dnode, DMU_USERUSED_OBJECT,
397 &os->os_userused_dnode);
398 DMU_GROUPUSED_DNODE(os) = dnode_special_open(os,
399 &os->os_phys->os_groupused_dnode, DMU_GROUPUSED_OBJECT,
400 &os->os_groupused_dnode);
401 }
402
403 /*
404 * We should be the only thread trying to do this because we
405 * have ds_opening_lock
406 */
407 if (ds) {
408 mutex_enter(&ds->ds_lock);
409 ASSERT(ds->ds_objset == NULL);
410 ds->ds_objset = os;
411 mutex_exit(&ds->ds_lock);
412 }
413
414 *osp = os;
415 return (0);
416 }
417
418 int
419 dmu_objset_from_ds(dsl_dataset_t *ds, objset_t **osp)
420 {
421 int err = 0;
422
423 mutex_enter(&ds->ds_opening_lock);
424 *osp = ds->ds_objset;
425 if (*osp == NULL) {
426 err = dmu_objset_open_impl(dsl_dataset_get_spa(ds),
427 ds, dsl_dataset_get_blkptr(ds), osp);
428 }
429 mutex_exit(&ds->ds_opening_lock);
430 return (err);
431 }
432
433 /* called from zpl */
434 int
435 dmu_objset_hold(const char *name, void *tag, objset_t **osp)
436 {
437 dsl_dataset_t *ds;
438 int err;
439
440 err = dsl_dataset_hold(name, tag, &ds);
441 if (err)
442 return (err);
443
444 err = dmu_objset_from_ds(ds, osp);
445 if (err)
446 dsl_dataset_rele(ds, tag);
447
448 return (err);
449 }
450
451 /* called from zpl */
452 int
453 dmu_objset_own(const char *name, dmu_objset_type_t type,
454 boolean_t readonly, void *tag, objset_t **osp)
455 {
456 dsl_dataset_t *ds;
457 int err;
458
459 err = dsl_dataset_own(name, B_FALSE, tag, &ds);
460 if (err)
461 return (err);
462
463 err = dmu_objset_from_ds(ds, osp);
464 if (err) {
465 dsl_dataset_disown(ds, tag);
466 } else if (type != DMU_OST_ANY && type != (*osp)->os_phys->os_type) {
467 dmu_objset_disown(*osp, tag);
468 return (EINVAL);
469 } else if (!readonly && dsl_dataset_is_snapshot(ds)) {
470 dmu_objset_disown(*osp, tag);
471 return (EROFS);
472 }
473 return (err);
474 }
475
476 void
477 dmu_objset_rele(objset_t *os, void *tag)
478 {
479 dsl_dataset_rele(os->os_dsl_dataset, tag);
480 }
481
482 void
483 dmu_objset_disown(objset_t *os, void *tag)
484 {
485 dsl_dataset_disown(os->os_dsl_dataset, tag);
486 }
487
488 int
489 dmu_objset_evict_dbufs(objset_t *os)
490 {
491 dnode_t *dn;
492
493 mutex_enter(&os->os_lock);
494
495 /* process the mdn last, since the other dnodes have holds on it */
496 list_remove(&os->os_dnodes, DMU_META_DNODE(os));
497 list_insert_tail(&os->os_dnodes, DMU_META_DNODE(os));
498
499 /*
500 * Find the first dnode with holds. We have to do this dance
501 * because dnode_add_ref() only works if you already have a
502 * hold. If there are no holds then it has no dbufs so OK to
503 * skip.
504 */
505 for (dn = list_head(&os->os_dnodes);
506 dn && !dnode_add_ref(dn, FTAG);
507 dn = list_next(&os->os_dnodes, dn))
508 continue;
509
510 while (dn) {
511 dnode_t *next_dn = dn;
512
513 do {
514 next_dn = list_next(&os->os_dnodes, next_dn);
515 } while (next_dn && !dnode_add_ref(next_dn, FTAG));
516
517 mutex_exit(&os->os_lock);
518 dnode_evict_dbufs(dn);
519 dnode_rele(dn, FTAG);
520 mutex_enter(&os->os_lock);
521 dn = next_dn;
522 }
523 dn = list_head(&os->os_dnodes);
524 mutex_exit(&os->os_lock);
525 return (dn != DMU_META_DNODE(os));
526 }
527
528 void
529 dmu_objset_evict(objset_t *os)
530 {
531 dsl_dataset_t *ds = os->os_dsl_dataset;
532
533 for (int t = 0; t < TXG_SIZE; t++)
534 ASSERT(!dmu_objset_is_dirty(os, t));
535
536 if (ds) {
537 if (!dsl_dataset_is_snapshot(ds)) {
538 VERIFY(0 == dsl_prop_unregister(ds, "checksum",
539 checksum_changed_cb, os));
540 VERIFY(0 == dsl_prop_unregister(ds, "compression",
541 compression_changed_cb, os));
542 VERIFY(0 == dsl_prop_unregister(ds, "copies",
543 copies_changed_cb, os));
544 VERIFY(0 == dsl_prop_unregister(ds, "dedup",
545 dedup_changed_cb, os));
546 VERIFY(0 == dsl_prop_unregister(ds, "logbias",
547 logbias_changed_cb, os));
548 VERIFY(0 == dsl_prop_unregister(ds, "sync",
549 sync_changed_cb, os));
550 }
551 VERIFY(0 == dsl_prop_unregister(ds, "primarycache",
552 primary_cache_changed_cb, os));
553 VERIFY(0 == dsl_prop_unregister(ds, "secondarycache",
554 secondary_cache_changed_cb, os));
555 }
556
557 if (os->os_sa)
558 sa_tear_down(os);
559
560 /*
561 * We should need only a single pass over the dnode list, since
562 * nothing can be added to the list at this point.
563 */
564 (void) dmu_objset_evict_dbufs(os);
565
566 dnode_special_close(&os->os_meta_dnode);
567 if (DMU_USERUSED_DNODE(os)) {
568 dnode_special_close(&os->os_userused_dnode);
569 dnode_special_close(&os->os_groupused_dnode);
570 }
571 zil_free(os->os_zil);
572
573 ASSERT3P(list_head(&os->os_dnodes), ==, NULL);
574
575 VERIFY(arc_buf_remove_ref(os->os_phys_buf, &os->os_phys_buf) == 1);
576
577 /*
578 * This is a barrier to prevent the objset from going away in
579 * dnode_move() until we can safely ensure that the objset is still in
580 * use. We consider the objset valid before the barrier and invalid
581 * after the barrier.
582 */
583 rw_enter(&os_lock, RW_READER);
584 rw_exit(&os_lock);
585
586 mutex_destroy(&os->os_lock);
587 mutex_destroy(&os->os_obj_lock);
588 mutex_destroy(&os->os_user_ptr_lock);
589 kmem_free(os, sizeof (objset_t));
590 }
591
592 timestruc_t
593 dmu_objset_snap_cmtime(objset_t *os)
594 {
595 return (dsl_dir_snap_cmtime(os->os_dsl_dataset->ds_dir));
596 }
597
598 /* called from dsl for meta-objset */
599 objset_t *
600 dmu_objset_create_impl(spa_t *spa, dsl_dataset_t *ds, blkptr_t *bp,
601 dmu_objset_type_t type, dmu_tx_t *tx)
602 {
603 objset_t *os;
604 dnode_t *mdn;
605
606 ASSERT(dmu_tx_is_syncing(tx));
607 if (ds != NULL)
608 VERIFY(0 == dmu_objset_from_ds(ds, &os));
609 else
610 VERIFY(0 == dmu_objset_open_impl(spa, NULL, bp, &os));
611
612 mdn = DMU_META_DNODE(os);
613
614 dnode_allocate(mdn, DMU_OT_DNODE, 1 << DNODE_BLOCK_SHIFT,
615 DN_MAX_INDBLKSHIFT, DMU_OT_NONE, 0, tx);
616
617 /*
618 * We don't want to have to increase the meta-dnode's nlevels
619 * later, because then we could do it in quescing context while
620 * we are also accessing it in open context.
621 *
622 * This precaution is not necessary for the MOS (ds == NULL),
623 * because the MOS is only updated in syncing context.
624 * This is most fortunate: the MOS is the only objset that
625 * needs to be synced multiple times as spa_sync() iterates
626 * to convergence, so minimizing its dn_nlevels matters.
627 */
628 if (ds != NULL) {
629 int levels = 1;
630
631 /*
632 * Determine the number of levels necessary for the meta-dnode
633 * to contain DN_MAX_OBJECT dnodes.
634 */
635 while ((uint64_t)mdn->dn_nblkptr << (mdn->dn_datablkshift +
636 (levels - 1) * (mdn->dn_indblkshift - SPA_BLKPTRSHIFT)) <
637 DN_MAX_OBJECT * sizeof (dnode_phys_t))
638 levels++;
639
640 mdn->dn_next_nlevels[tx->tx_txg & TXG_MASK] =
641 mdn->dn_nlevels = levels;
642 }
643
644 ASSERT(type != DMU_OST_NONE);
645 ASSERT(type != DMU_OST_ANY);
646 ASSERT(type < DMU_OST_NUMTYPES);
647 os->os_phys->os_type = type;
648 if (dmu_objset_userused_enabled(os)) {
649 os->os_phys->os_flags |= OBJSET_FLAG_USERACCOUNTING_COMPLETE;
650 os->os_flags = os->os_phys->os_flags;
651 }
652
653 dsl_dataset_dirty(ds, tx);
654
655 return (os);
656 }
657
658 struct oscarg {
659 void (*userfunc)(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx);
660 void *userarg;
661 dsl_dataset_t *clone_origin;
662 const char *lastname;
663 dmu_objset_type_t type;
664 uint64_t flags;
665 cred_t *cr;
666 };
667
668 /*ARGSUSED*/
669 static int
670 dmu_objset_create_check(void *arg1, void *arg2, dmu_tx_t *tx)
671 {
672 dsl_dir_t *dd = arg1;
673 struct oscarg *oa = arg2;
674 objset_t *mos = dd->dd_pool->dp_meta_objset;
675 int err;
676 uint64_t ddobj;
677
678 err = zap_lookup(mos, dd->dd_phys->dd_child_dir_zapobj,
679 oa->lastname, sizeof (uint64_t), 1, &ddobj);
680 if (err != ENOENT)
681 return (err ? err : EEXIST);
682
683 if (oa->clone_origin != NULL) {
684 /* You can't clone across pools. */
685 if (oa->clone_origin->ds_dir->dd_pool != dd->dd_pool)
686 return (EXDEV);
687
688 /* You can only clone snapshots, not the head datasets. */
689 if (!dsl_dataset_is_snapshot(oa->clone_origin))
690 return (EINVAL);
691 }
692
693 return (0);
694 }
695
696 static void
697 dmu_objset_create_sync(void *arg1, void *arg2, dmu_tx_t *tx)
698 {
699 dsl_dir_t *dd = arg1;
700 spa_t *spa = dd->dd_pool->dp_spa;
701 struct oscarg *oa = arg2;
702 uint64_t obj;
703 dsl_dataset_t *ds;
704 blkptr_t *bp;
705
706 ASSERT(dmu_tx_is_syncing(tx));
707
708 obj = dsl_dataset_create_sync(dd, oa->lastname,
709 oa->clone_origin, oa->flags, oa->cr, tx);
710
711 VERIFY3U(0, ==, dsl_dataset_hold_obj(dd->dd_pool, obj, FTAG, &ds));
712 bp = dsl_dataset_get_blkptr(ds);
713 if (BP_IS_HOLE(bp)) {
714 objset_t *os =
715 dmu_objset_create_impl(spa, ds, bp, oa->type, tx);
716
717 if (oa->userfunc)
718 oa->userfunc(os, oa->userarg, oa->cr, tx);
719 }
720
721 if (oa->clone_origin == NULL) {
722 spa_history_log_internal_ds(ds, "create", tx, "");
723 } else {
724 char namebuf[MAXNAMELEN];
725 dsl_dataset_name(oa->clone_origin, namebuf);
726 spa_history_log_internal_ds(ds, "clone", tx,
727 "origin=%s (%llu)", namebuf, oa->clone_origin->ds_object);
728 }
729 dsl_dataset_rele(ds, FTAG);
730 }
731
732 int
733 dmu_objset_create(const char *name, dmu_objset_type_t type, uint64_t flags,
734 void (*func)(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx), void *arg)
735 {
736 dsl_dir_t *pdd;
737 const char *tail;
738 int err = 0;
739 struct oscarg oa = { 0 };
740
741 ASSERT(strchr(name, '@') == NULL);
742 err = dsl_dir_open(name, FTAG, &pdd, &tail);
743 if (err)
744 return (err);
745 if (tail == NULL) {
746 dsl_dir_close(pdd, FTAG);
747 return (EEXIST);
748 }
749
750 oa.userfunc = func;
751 oa.userarg = arg;
752 oa.lastname = tail;
753 oa.type = type;
754 oa.flags = flags;
755 oa.cr = CRED();
756
757 err = dsl_sync_task_do(pdd->dd_pool, dmu_objset_create_check,
758 dmu_objset_create_sync, pdd, &oa, 5);
759 dsl_dir_close(pdd, FTAG);
760 return (err);
761 }
762
763 int
764 dmu_objset_clone(const char *name, dsl_dataset_t *clone_origin, uint64_t flags)
765 {
766 dsl_dir_t *pdd;
767 const char *tail;
768 int err = 0;
769 struct oscarg oa = { 0 };
770
771 ASSERT(strchr(name, '@') == NULL);
772 err = dsl_dir_open(name, FTAG, &pdd, &tail);
773 if (err)
774 return (err);
775 if (tail == NULL) {
776 dsl_dir_close(pdd, FTAG);
777 return (EEXIST);
778 }
779
780 oa.lastname = tail;
781 oa.clone_origin = clone_origin;
782 oa.flags = flags;
783 oa.cr = CRED();
784
785 err = dsl_sync_task_do(pdd->dd_pool, dmu_objset_create_check,
786 dmu_objset_create_sync, pdd, &oa, 5);
787 dsl_dir_close(pdd, FTAG);
788 return (err);
789 }
790
791 int
792 dmu_objset_destroy(const char *name, boolean_t defer)
793 {
794 dsl_dataset_t *ds;
795 int error;
796
797 error = dsl_dataset_own(name, B_TRUE, FTAG, &ds);
798 if (error == 0) {
799 error = dsl_dataset_destroy(ds, FTAG, defer);
800 /* dsl_dataset_destroy() closes the ds. */
801 }
802
803 return (error);
804 }
805
806 typedef struct snapallarg {
807 dsl_sync_task_group_t *saa_dstg;
808 boolean_t saa_needsuspend;
809 nvlist_t *saa_props;
810
811 /* the following are used only if 'temporary' is set: */
812 boolean_t saa_temporary;
813 const char *saa_htag;
814 struct dsl_ds_holdarg *saa_ha;
815 dsl_dataset_t *saa_newds;
816 } snapallarg_t;
817
818 typedef struct snaponearg {
819 const char *soa_longname; /* long snap name */
820 const char *soa_snapname; /* short snap name */
821 snapallarg_t *soa_saa;
822 } snaponearg_t;
823
824 static int
825 snapshot_check(void *arg1, void *arg2, dmu_tx_t *tx)
826 {
827 objset_t *os = arg1;
828 snaponearg_t *soa = arg2;
829 snapallarg_t *saa = soa->soa_saa;
830 int error;
831
832 /* The props have already been checked by zfs_check_userprops(). */
833
834 error = dsl_dataset_snapshot_check(os->os_dsl_dataset,
835 soa->soa_snapname, tx);
836 if (error)
837 return (error);
838
839 if (saa->saa_temporary) {
840 /*
841 * Ideally we would just call
842 * dsl_dataset_user_hold_check() and
843 * dsl_dataset_destroy_check() here. However the
844 * dataset we want to hold and destroy is the snapshot
845 * that we just confirmed we can create, but it won't
846 * exist until after these checks are run. Do any
847 * checks we can here and if more checks are added to
848 * those routines in the future, similar checks may be
849 * necessary here.
850 */
851 if (spa_version(os->os_spa) < SPA_VERSION_USERREFS)
852 return (ENOTSUP);
853 /*
854 * Not checking number of tags because the tag will be
855 * unique, as it will be the only tag.
856 */
857 if (strlen(saa->saa_htag) + MAX_TAG_PREFIX_LEN >= MAXNAMELEN)
858 return (E2BIG);
859
860 saa->saa_ha = kmem_alloc(sizeof (struct dsl_ds_holdarg),
861 KM_SLEEP);
862 saa->saa_ha->temphold = B_TRUE;
863 saa->saa_ha->htag = saa->saa_htag;
864 }
865 return (error);
866 }
867
868 static void
869 snapshot_sync(void *arg1, void *arg2, dmu_tx_t *tx)
870 {
871 objset_t *os = arg1;
872 dsl_dataset_t *ds = os->os_dsl_dataset;
873 snaponearg_t *soa = arg2;
874 snapallarg_t *saa = soa->soa_saa;
875
876 dsl_dataset_snapshot_sync(ds, soa->soa_snapname, tx);
877
878 if (saa->saa_props != NULL) {
879 dsl_props_arg_t pa;
880 pa.pa_props = saa->saa_props;
881 pa.pa_source = ZPROP_SRC_LOCAL;
882 dsl_props_set_sync(ds->ds_prev, &pa, tx);
883 }
884
885 if (saa->saa_temporary) {
886 struct dsl_ds_destroyarg da;
887
888 dsl_dataset_user_hold_sync(ds->ds_prev, saa->saa_ha, tx);
889 kmem_free(saa->saa_ha, sizeof (struct dsl_ds_holdarg));
890 saa->saa_ha = NULL;
891 saa->saa_newds = ds->ds_prev;
892
893 da.ds = ds->ds_prev;
894 da.defer = B_TRUE;
895 dsl_dataset_destroy_sync(&da, FTAG, tx);
896 }
897 }
898
899 static int
900 snapshot_one_impl(const char *snapname, void *arg)
901 {
902 char fsname[MAXPATHLEN];
903 snapallarg_t *saa = arg;
904 snaponearg_t *soa;
905 objset_t *os;
906 int err;
907
908 (void) strlcpy(fsname, snapname, sizeof (fsname));
909 strchr(fsname, '@')[0] = '\0';
910
911 err = dmu_objset_hold(fsname, saa, &os);
912 if (err != 0)
913 return (err);
914
915 /*
916 * If the objset is in an inconsistent state (eg, in the process
917 * of being destroyed), don't snapshot it.
918 */
919 if (os->os_dsl_dataset->ds_phys->ds_flags & DS_FLAG_INCONSISTENT) {
920 dmu_objset_rele(os, saa);
921 return (EBUSY);
922 }
923
924 if (saa->saa_needsuspend) {
925 err = zil_suspend(dmu_objset_zil(os));
926 if (err) {
927 dmu_objset_rele(os, saa);
928 return (err);
929 }
930 }
931
932 soa = kmem_zalloc(sizeof (*soa), KM_SLEEP);
933 soa->soa_saa = saa;
934 soa->soa_longname = snapname;
935 soa->soa_snapname = strchr(snapname, '@') + 1;
936
937 dsl_sync_task_create(saa->saa_dstg, snapshot_check, snapshot_sync,
938 os, soa, 3);
939
940 return (0);
941 }
942
943 /*
944 * The snapshots must all be in the same pool.
945 */
946 int
947 dmu_objset_snapshot(nvlist_t *snaps, nvlist_t *props, nvlist_t *errors)
948 {
949 dsl_sync_task_t *dst;
950 snapallarg_t saa = { 0 };
951 spa_t *spa;
952 int rv = 0;
953 int err;
954 nvpair_t *pair;
955
956 pair = nvlist_next_nvpair(snaps, NULL);
957 if (pair == NULL)
958 return (0);
959
960 err = spa_open(nvpair_name(pair), &spa, FTAG);
961 if (err)
962 return (err);
963 saa.saa_dstg = dsl_sync_task_group_create(spa_get_dsl(spa));
964 saa.saa_props = props;
965 saa.saa_needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP);
966
967 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL;
968 pair = nvlist_next_nvpair(snaps, pair)) {
969 err = snapshot_one_impl(nvpair_name(pair), &saa);
970 if (err != 0) {
971 if (errors != NULL) {
972 fnvlist_add_int32(errors,
973 nvpair_name(pair), err);
974 }
975 rv = err;
976 }
977 }
978
979 /*
980 * If any call to snapshot_one_impl() failed, don't execute the
981 * sync task. The error handling code below will clean up the
982 * snaponearg_t from any successful calls to
983 * snapshot_one_impl().
984 */
985 if (rv == 0)
986 err = dsl_sync_task_group_wait(saa.saa_dstg);
987 if (err != 0)
988 rv = err;
989
990 for (dst = list_head(&saa.saa_dstg->dstg_tasks); dst;
991 dst = list_next(&saa.saa_dstg->dstg_tasks, dst)) {
992 objset_t *os = dst->dst_arg1;
993 snaponearg_t *soa = dst->dst_arg2;
994 if (dst->dst_err != 0) {
995 if (errors != NULL) {
996 fnvlist_add_int32(errors,
997 soa->soa_longname, dst->dst_err);
998 }
999 rv = dst->dst_err;
1000 }
1001
1002 if (saa.saa_needsuspend)
1003 zil_resume(dmu_objset_zil(os));
1004 dmu_objset_rele(os, &saa);
1005 kmem_free(soa, sizeof (*soa));
1006 }
1007
1008 dsl_sync_task_group_destroy(saa.saa_dstg);
1009 spa_close(spa, FTAG);
1010 return (rv);
1011 }
1012
1013 int
1014 dmu_objset_snapshot_one(const char *fsname, const char *snapname)
1015 {
1016 int err;
1017 char *longsnap = kmem_asprintf("%s@%s", fsname, snapname);
1018 nvlist_t *snaps = fnvlist_alloc();
1019
1020 fnvlist_add_boolean(snaps, longsnap);
1021 err = dmu_objset_snapshot(snaps, NULL, NULL);
1022 fnvlist_free(snaps);
1023 strfree(longsnap);
1024 return (err);
1025 }
1026
1027 int
1028 dmu_objset_snapshot_tmp(const char *snapname, const char *tag, int cleanup_fd)
1029 {
1030 dsl_sync_task_t *dst;
1031 snapallarg_t saa = { 0 };
1032 spa_t *spa;
1033 minor_t minor;
1034 int err;
1035
1036 err = spa_open(snapname, &spa, FTAG);
1037 if (err)
1038 return (err);
1039 saa.saa_dstg = dsl_sync_task_group_create(spa_get_dsl(spa));
1040 saa.saa_htag = tag;
1041 saa.saa_needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP);
1042 saa.saa_temporary = B_TRUE;
1043
1044 if (cleanup_fd < 0) {
1045 spa_close(spa, FTAG);
1046 return (EINVAL);
1047 }
1048 if ((err = zfs_onexit_fd_hold(cleanup_fd, &minor)) != 0) {
1049 spa_close(spa, FTAG);
1050 return (err);
1051 }
1052
1053 err = snapshot_one_impl(snapname, &saa);
1054
1055 if (err == 0)
1056 err = dsl_sync_task_group_wait(saa.saa_dstg);
1057
1058 for (dst = list_head(&saa.saa_dstg->dstg_tasks); dst;
1059 dst = list_next(&saa.saa_dstg->dstg_tasks, dst)) {
1060 objset_t *os = dst->dst_arg1;
1061 dsl_register_onexit_hold_cleanup(saa.saa_newds, tag, minor);
1062 if (saa.saa_needsuspend)
1063 zil_resume(dmu_objset_zil(os));
1064 dmu_objset_rele(os, &saa);
1065 }
1066
1067 zfs_onexit_fd_rele(cleanup_fd);
1068 dsl_sync_task_group_destroy(saa.saa_dstg);
1069 spa_close(spa, FTAG);
1070 return (err);
1071 }
1072
1073
1074 static void
1075 dmu_objset_sync_dnodes(list_t *list, list_t *newlist, dmu_tx_t *tx)
1076 {
1077 dnode_t *dn;
1078
1079 while (dn = list_head(list)) {
1080 ASSERT(dn->dn_object != DMU_META_DNODE_OBJECT);
1081 ASSERT(dn->dn_dbuf->db_data_pending);
1082 /*
1083 * Initialize dn_zio outside dnode_sync() because the
1084 * meta-dnode needs to set it ouside dnode_sync().
1085 */
1086 dn->dn_zio = dn->dn_dbuf->db_data_pending->dr_zio;
1087 ASSERT(dn->dn_zio);
1088
1089 ASSERT3U(dn->dn_nlevels, <=, DN_MAX_LEVELS);
1090 list_remove(list, dn);
1091
1092 if (newlist) {
1093 (void) dnode_add_ref(dn, newlist);
1094 list_insert_tail(newlist, dn);
1095 }
1096
1097 dnode_sync(dn, tx);
1098 }
1099 }
1100
1101 /* ARGSUSED */
1102 static void
1103 dmu_objset_write_ready(zio_t *zio, arc_buf_t *abuf, void *arg)
1104 {
1105 blkptr_t *bp = zio->io_bp;
1106 objset_t *os = arg;
1107 dnode_phys_t *dnp = &os->os_phys->os_meta_dnode;
1108
1109 ASSERT(bp == os->os_rootbp);
1110 ASSERT(BP_GET_TYPE(bp) == DMU_OT_OBJSET);
1111 ASSERT(BP_GET_LEVEL(bp) == 0);
1112
1113 /*
1114 * Update rootbp fill count: it should be the number of objects
1115 * allocated in the object set (not counting the "special"
1116 * objects that are stored in the objset_phys_t -- the meta
1117 * dnode and user/group accounting objects).
1118 */
1119 bp->blk_fill = 0;
1120 for (int i = 0; i < dnp->dn_nblkptr; i++)
1121 bp->blk_fill += dnp->dn_blkptr[i].blk_fill;
1122 }
1123
1124 /* ARGSUSED */
1125 static void
1126 dmu_objset_write_done(zio_t *zio, arc_buf_t *abuf, void *arg)
1127 {
1128 blkptr_t *bp = zio->io_bp;
1129 blkptr_t *bp_orig = &zio->io_bp_orig;
1130 objset_t *os = arg;
1131
1132 if (zio->io_flags & ZIO_FLAG_IO_REWRITE) {
1133 ASSERT(BP_EQUAL(bp, bp_orig));
1134 } else {
1135 dsl_dataset_t *ds = os->os_dsl_dataset;
1136 dmu_tx_t *tx = os->os_synctx;
1137
1138 (void) dsl_dataset_block_kill(ds, bp_orig, tx, B_TRUE);
1139 dsl_dataset_block_born(ds, bp, tx);
1140 }
1141 }
1142
1143 /* called from dsl */
1144 void
1145 dmu_objset_sync(objset_t *os, zio_t *pio, dmu_tx_t *tx)
1146 {
1147 int txgoff;
1148 zbookmark_t zb;
1149 zio_prop_t zp;
1150 zio_t *zio;
1151 list_t *list;
1152 list_t *newlist = NULL;
1153 dbuf_dirty_record_t *dr;
1154
1155 dprintf_ds(os->os_dsl_dataset, "txg=%llu\n", tx->tx_txg);
1156
1157 ASSERT(dmu_tx_is_syncing(tx));
1158 /* XXX the write_done callback should really give us the tx... */
1159 os->os_synctx = tx;
1160
1161 if (os->os_dsl_dataset == NULL) {
1162 /*
1163 * This is the MOS. If we have upgraded,
1164 * spa_max_replication() could change, so reset
1165 * os_copies here.
1166 */
1167 os->os_copies = spa_max_replication(os->os_spa);
1168 }
1169
1170 /*
1171 * Create the root block IO
1172 */
1173 SET_BOOKMARK(&zb, os->os_dsl_dataset ?
1174 os->os_dsl_dataset->ds_object : DMU_META_OBJSET,
1175 ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID);
1176 VERIFY3U(0, ==, arc_release_bp(os->os_phys_buf, &os->os_phys_buf,
1177 os->os_rootbp, os->os_spa, &zb));
1178
1179 dmu_write_policy(os, NULL, 0, 0, &zp);
1180
1181 zio = arc_write(pio, os->os_spa, tx->tx_txg,
1182 os->os_rootbp, os->os_phys_buf, DMU_OS_IS_L2CACHEABLE(os), &zp,
1183 dmu_objset_write_ready, dmu_objset_write_done, os,
1184 ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_MUSTSUCCEED, &zb);
1185
1186 /*
1187 * Sync special dnodes - the parent IO for the sync is the root block
1188 */
1189 DMU_META_DNODE(os)->dn_zio = zio;
1190 dnode_sync(DMU_META_DNODE(os), tx);
1191
1192 os->os_phys->os_flags = os->os_flags;
1193
1194 if (DMU_USERUSED_DNODE(os) &&
1195 DMU_USERUSED_DNODE(os)->dn_type != DMU_OT_NONE) {
1196 DMU_USERUSED_DNODE(os)->dn_zio = zio;
1197 dnode_sync(DMU_USERUSED_DNODE(os), tx);
1198 DMU_GROUPUSED_DNODE(os)->dn_zio = zio;
1199 dnode_sync(DMU_GROUPUSED_DNODE(os), tx);
1200 }
1201
1202 txgoff = tx->tx_txg & TXG_MASK;
1203
1204 if (dmu_objset_userused_enabled(os)) {
1205 newlist = &os->os_synced_dnodes;
1206 /*
1207 * We must create the list here because it uses the
1208 * dn_dirty_link[] of this txg.
1209 */
1210 list_create(newlist, sizeof (dnode_t),
1211 offsetof(dnode_t, dn_dirty_link[txgoff]));
1212 }
1213
1214 dmu_objset_sync_dnodes(&os->os_free_dnodes[txgoff], newlist, tx);
1215 dmu_objset_sync_dnodes(&os->os_dirty_dnodes[txgoff], newlist, tx);
1216
1217 list = &DMU_META_DNODE(os)->dn_dirty_records[txgoff];
1218 while (dr = list_head(list)) {
1219 ASSERT(dr->dr_dbuf->db_level == 0);
1220 list_remove(list, dr);
1221 if (dr->dr_zio)
1222 zio_nowait(dr->dr_zio);
1223 }
1224 /*
1225 * Free intent log blocks up to this tx.
1226 */
1227 zil_sync(os->os_zil, tx);
1228 os->os_phys->os_zil_header = os->os_zil_header;
1229 zio_nowait(zio);
1230 }
1231
1232 boolean_t
1233 dmu_objset_is_dirty(objset_t *os, uint64_t txg)
1234 {
1235 return (!list_is_empty(&os->os_dirty_dnodes[txg & TXG_MASK]) ||
1236 !list_is_empty(&os->os_free_dnodes[txg & TXG_MASK]));
1237 }
1238
1239 static objset_used_cb_t *used_cbs[DMU_OST_NUMTYPES];
1240
1241 void
1242 dmu_objset_register_type(dmu_objset_type_t ost, objset_used_cb_t *cb)
1243 {
1244 used_cbs[ost] = cb;
1245 }
1246
1247 boolean_t
1248 dmu_objset_userused_enabled(objset_t *os)
1249 {
1250 return (spa_version(os->os_spa) >= SPA_VERSION_USERSPACE &&
1251 used_cbs[os->os_phys->os_type] != NULL &&
1252 DMU_USERUSED_DNODE(os) != NULL);
1253 }
1254
1255 static void
1256 do_userquota_update(objset_t *os, uint64_t used, uint64_t flags,
1257 uint64_t user, uint64_t group, boolean_t subtract, dmu_tx_t *tx)
1258 {
1259 if ((flags & DNODE_FLAG_USERUSED_ACCOUNTED)) {
1260 int64_t delta = DNODE_SIZE + used;
1261 if (subtract)
1262 delta = -delta;
1263 VERIFY3U(0, ==, zap_increment_int(os, DMU_USERUSED_OBJECT,
1264 user, delta, tx));
1265 VERIFY3U(0, ==, zap_increment_int(os, DMU_GROUPUSED_OBJECT,
1266 group, delta, tx));
1267 }
1268 }
1269
1270 void
1271 dmu_objset_do_userquota_updates(objset_t *os, dmu_tx_t *tx)
1272 {
1273 dnode_t *dn;
1274 list_t *list = &os->os_synced_dnodes;
1275
1276 ASSERT(list_head(list) == NULL || dmu_objset_userused_enabled(os));
1277
1278 while (dn = list_head(list)) {
1279 int flags;
1280 ASSERT(!DMU_OBJECT_IS_SPECIAL(dn->dn_object));
1281 ASSERT(dn->dn_phys->dn_type == DMU_OT_NONE ||
1282 dn->dn_phys->dn_flags &
1283 DNODE_FLAG_USERUSED_ACCOUNTED);
1284
1285 /* Allocate the user/groupused objects if necessary. */
1286 if (DMU_USERUSED_DNODE(os)->dn_type == DMU_OT_NONE) {
1287 VERIFY(0 == zap_create_claim(os,
1288 DMU_USERUSED_OBJECT,
1289 DMU_OT_USERGROUP_USED, DMU_OT_NONE, 0, tx));
1290 VERIFY(0 == zap_create_claim(os,
1291 DMU_GROUPUSED_OBJECT,
1292 DMU_OT_USERGROUP_USED, DMU_OT_NONE, 0, tx));
1293 }
1294
1295 /*
1296 * We intentionally modify the zap object even if the
1297 * net delta is zero. Otherwise
1298 * the block of the zap obj could be shared between
1299 * datasets but need to be different between them after
1300 * a bprewrite.
1301 */
1302
1303 flags = dn->dn_id_flags;
1304 ASSERT(flags);
1305 if (flags & DN_ID_OLD_EXIST) {
1306 do_userquota_update(os, dn->dn_oldused, dn->dn_oldflags,
1307 dn->dn_olduid, dn->dn_oldgid, B_TRUE, tx);
1308 }
1309 if (flags & DN_ID_NEW_EXIST) {
1310 do_userquota_update(os, DN_USED_BYTES(dn->dn_phys),
1311 dn->dn_phys->dn_flags, dn->dn_newuid,
1312 dn->dn_newgid, B_FALSE, tx);
1313 }
1314
1315 mutex_enter(&dn->dn_mtx);
1316 dn->dn_oldused = 0;
1317 dn->dn_oldflags = 0;
1318 if (dn->dn_id_flags & DN_ID_NEW_EXIST) {
1319 dn->dn_olduid = dn->dn_newuid;
1320 dn->dn_oldgid = dn->dn_newgid;
1321 dn->dn_id_flags |= DN_ID_OLD_EXIST;
1322 if (dn->dn_bonuslen == 0)
1323 dn->dn_id_flags |= DN_ID_CHKED_SPILL;
1324 else
1325 dn->dn_id_flags |= DN_ID_CHKED_BONUS;
1326 }
1327 dn->dn_id_flags &= ~(DN_ID_NEW_EXIST);
1328 mutex_exit(&dn->dn_mtx);
1329
1330 list_remove(list, dn);
1331 dnode_rele(dn, list);
1332 }
1333 }
1334
1335 /*
1336 * Returns a pointer to data to find uid/gid from
1337 *
1338 * If a dirty record for transaction group that is syncing can't
1339 * be found then NULL is returned. In the NULL case it is assumed
1340 * the uid/gid aren't changing.
1341 */
1342 static void *
1343 dmu_objset_userquota_find_data(dmu_buf_impl_t *db, dmu_tx_t *tx)
1344 {
1345 dbuf_dirty_record_t *dr, **drp;
1346 void *data;
1347
1348 if (db->db_dirtycnt == 0)
1349 return (db->db.db_data); /* Nothing is changing */
1350
1351 for (drp = &db->db_last_dirty; (dr = *drp) != NULL; drp = &dr->dr_next)
1352 if (dr->dr_txg == tx->tx_txg)
1353 break;
1354
1355 if (dr == NULL) {
1356 data = NULL;
1357 } else {
1358 dnode_t *dn;
1359
1360 DB_DNODE_ENTER(dr->dr_dbuf);
1361 dn = DB_DNODE(dr->dr_dbuf);
1362
1363 if (dn->dn_bonuslen == 0 &&
1364 dr->dr_dbuf->db_blkid == DMU_SPILL_BLKID)
1365 data = dr->dt.dl.dr_data->b_data;
1366 else
1367 data = dr->dt.dl.dr_data;
1368
1369 DB_DNODE_EXIT(dr->dr_dbuf);
1370 }
1371
1372 return (data);
1373 }
1374
1375 void
1376 dmu_objset_userquota_get_ids(dnode_t *dn, boolean_t before, dmu_tx_t *tx)
1377 {
1378 objset_t *os = dn->dn_objset;
1379 void *data = NULL;
1380 dmu_buf_impl_t *db = NULL;
1381 uint64_t *user, *group;
1382 int flags = dn->dn_id_flags;
1383 int error;
1384 boolean_t have_spill = B_FALSE;
1385
1386 if (!dmu_objset_userused_enabled(dn->dn_objset))
1387 return;
1388
1389 if (before && (flags & (DN_ID_CHKED_BONUS|DN_ID_OLD_EXIST|
1390 DN_ID_CHKED_SPILL)))
1391 return;
1392
1393 if (before && dn->dn_bonuslen != 0)
1394 data = DN_BONUS(dn->dn_phys);
1395 else if (!before && dn->dn_bonuslen != 0) {
1396 if (dn->dn_bonus) {
1397 db = dn->dn_bonus;
1398 mutex_enter(&db->db_mtx);
1399 data = dmu_objset_userquota_find_data(db, tx);
1400 } else {
1401 data = DN_BONUS(dn->dn_phys);
1402 }
1403 } else if (dn->dn_bonuslen == 0 && dn->dn_bonustype == DMU_OT_SA) {
1404 int rf = 0;
1405
1406 if (RW_WRITE_HELD(&dn->dn_struct_rwlock))
1407 rf |= DB_RF_HAVESTRUCT;
1408 error = dmu_spill_hold_by_dnode(dn,
1409 rf | DB_RF_MUST_SUCCEED,
1410 FTAG, (dmu_buf_t **)&db);
1411 ASSERT(error == 0);
1412 mutex_enter(&db->db_mtx);
1413 data = (before) ? db->db.db_data :
1414 dmu_objset_userquota_find_data(db, tx);
1415 have_spill = B_TRUE;
1416 } else {
1417 mutex_enter(&dn->dn_mtx);
1418 dn->dn_id_flags |= DN_ID_CHKED_BONUS;
1419 mutex_exit(&dn->dn_mtx);
1420 return;
1421 }
1422
1423 if (before) {
1424 ASSERT(data);
1425 user = &dn->dn_olduid;
1426 group = &dn->dn_oldgid;
1427 } else if (data) {
1428 user = &dn->dn_newuid;
1429 group = &dn->dn_newgid;
1430 }
1431
1432 /*
1433 * Must always call the callback in case the object
1434 * type has changed and that type isn't an object type to track
1435 */
1436 error = used_cbs[os->os_phys->os_type](dn->dn_bonustype, data,
1437 user, group);
1438
1439 /*
1440 * Preserve existing uid/gid when the callback can't determine
1441 * what the new uid/gid are and the callback returned EEXIST.
1442 * The EEXIST error tells us to just use the existing uid/gid.
1443 * If we don't know what the old values are then just assign
1444 * them to 0, since that is a new file being created.
1445 */
1446 if (!before && data == NULL && error == EEXIST) {
1447 if (flags & DN_ID_OLD_EXIST) {
1448 dn->dn_newuid = dn->dn_olduid;
1449 dn->dn_newgid = dn->dn_oldgid;
1450 } else {
1451 dn->dn_newuid = 0;
1452 dn->dn_newgid = 0;
1453 }
1454 error = 0;
1455 }
1456
1457 if (db)
1458 mutex_exit(&db->db_mtx);
1459
1460 mutex_enter(&dn->dn_mtx);
1461 if (error == 0 && before)
1462 dn->dn_id_flags |= DN_ID_OLD_EXIST;
1463 if (error == 0 && !before)
1464 dn->dn_id_flags |= DN_ID_NEW_EXIST;
1465
1466 if (have_spill) {
1467 dn->dn_id_flags |= DN_ID_CHKED_SPILL;
1468 } else {
1469 dn->dn_id_flags |= DN_ID_CHKED_BONUS;
1470 }
1471 mutex_exit(&dn->dn_mtx);
1472 if (have_spill)
1473 dmu_buf_rele((dmu_buf_t *)db, FTAG);
1474 }
1475
1476 boolean_t
1477 dmu_objset_userspace_present(objset_t *os)
1478 {
1479 return (os->os_phys->os_flags &
1480 OBJSET_FLAG_USERACCOUNTING_COMPLETE);
1481 }
1482
1483 int
1484 dmu_objset_userspace_upgrade(objset_t *os)
1485 {
1486 uint64_t obj;
1487 int err = 0;
1488
1489 if (dmu_objset_userspace_present(os))
1490 return (0);
1491 if (!dmu_objset_userused_enabled(os))
1492 return (ENOTSUP);
1493 if (dmu_objset_is_snapshot(os))
1494 return (EINVAL);
1495
1496 /*
1497 * We simply need to mark every object dirty, so that it will be
1498 * synced out and now accounted. If this is called
1499 * concurrently, or if we already did some work before crashing,
1500 * that's fine, since we track each object's accounted state
1501 * independently.
1502 */
1503
1504 for (obj = 0; err == 0; err = dmu_object_next(os, &obj, FALSE, 0)) {
1505 dmu_tx_t *tx;
1506 dmu_buf_t *db;
1507 int objerr;
1508
1509 if (issig(JUSTLOOKING) && issig(FORREAL))
1510 return (EINTR);
1511
1512 objerr = dmu_bonus_hold(os, obj, FTAG, &db);
1513 if (objerr)
1514 continue;
1515 tx = dmu_tx_create(os);
1516 dmu_tx_hold_bonus(tx, obj);
1517 objerr = dmu_tx_assign(tx, TXG_WAIT);
1518 if (objerr) {
1519 dmu_tx_abort(tx);
1520 continue;
1521 }
1522 dmu_buf_will_dirty(db, tx);
1523 dmu_buf_rele(db, FTAG);
1524 dmu_tx_commit(tx);
1525 }
1526
1527 os->os_flags |= OBJSET_FLAG_USERACCOUNTING_COMPLETE;
1528 txg_wait_synced(dmu_objset_pool(os), 0);
1529 return (0);
1530 }
1531
1532 void
1533 dmu_objset_space(objset_t *os, uint64_t *refdbytesp, uint64_t *availbytesp,
1534 uint64_t *usedobjsp, uint64_t *availobjsp)
1535 {
1536 dsl_dataset_space(os->os_dsl_dataset, refdbytesp, availbytesp,
1537 usedobjsp, availobjsp);
1538 }
1539
1540 uint64_t
1541 dmu_objset_fsid_guid(objset_t *os)
1542 {
1543 return (dsl_dataset_fsid_guid(os->os_dsl_dataset));
1544 }
1545
1546 void
1547 dmu_objset_fast_stat(objset_t *os, dmu_objset_stats_t *stat)
1548 {
1549 stat->dds_type = os->os_phys->os_type;
1550 if (os->os_dsl_dataset)
1551 dsl_dataset_fast_stat(os->os_dsl_dataset, stat);
1552 }
1553
1554 void
1555 dmu_objset_stats(objset_t *os, nvlist_t *nv)
1556 {
1557 ASSERT(os->os_dsl_dataset ||
1558 os->os_phys->os_type == DMU_OST_META);
1559
1560 if (os->os_dsl_dataset != NULL)
1561 dsl_dataset_stats(os->os_dsl_dataset, nv);
1562
1563 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_TYPE,
1564 os->os_phys->os_type);
1565 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERACCOUNTING,
1566 dmu_objset_userspace_present(os));
1567 }
1568
1569 int
1570 dmu_objset_is_snapshot(objset_t *os)
1571 {
1572 if (os->os_dsl_dataset != NULL)
1573 return (dsl_dataset_is_snapshot(os->os_dsl_dataset));
1574 else
1575 return (B_FALSE);
1576 }
1577
1578 int
1579 dmu_snapshot_realname(objset_t *os, char *name, char *real, int maxlen,
1580 boolean_t *conflict)
1581 {
1582 dsl_dataset_t *ds = os->os_dsl_dataset;
1583 uint64_t ignored;
1584
1585 if (ds->ds_phys->ds_snapnames_zapobj == 0)
1586 return (ENOENT);
1587
1588 return (zap_lookup_norm(ds->ds_dir->dd_pool->dp_meta_objset,
1589 ds->ds_phys->ds_snapnames_zapobj, name, 8, 1, &ignored, MT_FIRST,
1590 real, maxlen, conflict));
1591 }
1592
1593 int
1594 dmu_snapshot_list_next(objset_t *os, int namelen, char *name,
1595 uint64_t *idp, uint64_t *offp, boolean_t *case_conflict)
1596 {
1597 dsl_dataset_t *ds = os->os_dsl_dataset;
1598 zap_cursor_t cursor;
1599 zap_attribute_t attr;
1600
1601 if (ds->ds_phys->ds_snapnames_zapobj == 0)
1602 return (ENOENT);
1603
1604 zap_cursor_init_serialized(&cursor,
1605 ds->ds_dir->dd_pool->dp_meta_objset,
1606 ds->ds_phys->ds_snapnames_zapobj, *offp);
1607
1608 if (zap_cursor_retrieve(&cursor, &attr) != 0) {
1609 zap_cursor_fini(&cursor);
1610 return (ENOENT);
1611 }
1612
1613 if (strlen(attr.za_name) + 1 > namelen) {
1614 zap_cursor_fini(&cursor);
1615 return (ENAMETOOLONG);
1616 }
1617
1618 (void) strcpy(name, attr.za_name);
1619 if (idp)
1620 *idp = attr.za_first_integer;
1621 if (case_conflict)
1622 *case_conflict = attr.za_normalization_conflict;
1623 zap_cursor_advance(&cursor);
1624 *offp = zap_cursor_serialize(&cursor);
1625 zap_cursor_fini(&cursor);
1626
1627 return (0);
1628 }
1629
1630 int
1631 dmu_dir_list_next(objset_t *os, int namelen, char *name,
1632 uint64_t *idp, uint64_t *offp)
1633 {
1634 dsl_dir_t *dd = os->os_dsl_dataset->ds_dir;
1635 zap_cursor_t cursor;
1636 zap_attribute_t attr;
1637
1638 /* there is no next dir on a snapshot! */
1639 if (os->os_dsl_dataset->ds_object !=
1640 dd->dd_phys->dd_head_dataset_obj)
1641 return (ENOENT);
1642
1643 zap_cursor_init_serialized(&cursor,
1644 dd->dd_pool->dp_meta_objset,
1645 dd->dd_phys->dd_child_dir_zapobj, *offp);
1646
1647 if (zap_cursor_retrieve(&cursor, &attr) != 0) {
1648 zap_cursor_fini(&cursor);
1649 return (ENOENT);
1650 }
1651
1652 if (strlen(attr.za_name) + 1 > namelen) {
1653 zap_cursor_fini(&cursor);
1654 return (ENAMETOOLONG);
1655 }
1656
1657 (void) strcpy(name, attr.za_name);
1658 if (idp)
1659 *idp = attr.za_first_integer;
1660 zap_cursor_advance(&cursor);
1661 *offp = zap_cursor_serialize(&cursor);
1662 zap_cursor_fini(&cursor);
1663
1664 return (0);
1665 }
1666
1667 struct findarg {
1668 int (*func)(const char *, void *);
1669 void *arg;
1670 };
1671
1672 /* ARGSUSED */
1673 static int
1674 findfunc(spa_t *spa, uint64_t dsobj, const char *dsname, void *arg)
1675 {
1676 struct findarg *fa = arg;
1677 return (fa->func(dsname, fa->arg));
1678 }
1679
1680 /*
1681 * Find all objsets under name, and for each, call 'func(child_name, arg)'.
1682 * Perhaps change all callers to use dmu_objset_find_spa()?
1683 */
1684 int
1685 dmu_objset_find(char *name, int func(const char *, void *), void *arg,
1686 int flags)
1687 {
1688 struct findarg fa;
1689 fa.func = func;
1690 fa.arg = arg;
1691 return (dmu_objset_find_spa(NULL, name, findfunc, &fa, flags));
1692 }
1693
1694 /*
1695 * Find all objsets under name, call func on each
1696 */
1697 int
1698 dmu_objset_find_spa(spa_t *spa, const char *name,
1699 int func(spa_t *, uint64_t, const char *, void *), void *arg, int flags)
1700 {
1701 dsl_dir_t *dd;
1702 dsl_pool_t *dp;
1703 dsl_dataset_t *ds;
1704 zap_cursor_t zc;
1705 zap_attribute_t *attr;
1706 char *child;
1707 uint64_t thisobj;
1708 int err;
1709
1710 if (name == NULL)
1711 name = spa_name(spa);
1712 err = dsl_dir_open_spa(spa, name, FTAG, &dd, NULL);
1713 if (err)
1714 return (err);
1715
1716 /* Don't visit hidden ($MOS & $ORIGIN) objsets. */
1717 if (dd->dd_myname[0] == '$') {
1718 dsl_dir_close(dd, FTAG);
1719 return (0);
1720 }
1721
1722 thisobj = dd->dd_phys->dd_head_dataset_obj;
1723 attr = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP);
1724 dp = dd->dd_pool;
1725
1726 /*
1727 * Iterate over all children.
1728 */
1729 if (flags & DS_FIND_CHILDREN) {
1730 for (zap_cursor_init(&zc, dp->dp_meta_objset,
1731 dd->dd_phys->dd_child_dir_zapobj);
1732 zap_cursor_retrieve(&zc, attr) == 0;
1733 (void) zap_cursor_advance(&zc)) {
1734 ASSERT(attr->za_integer_length == sizeof (uint64_t));
1735 ASSERT(attr->za_num_integers == 1);
1736
1737 child = kmem_asprintf("%s/%s", name, attr->za_name);
1738 err = dmu_objset_find_spa(spa, child, func, arg, flags);
1739 strfree(child);
1740 if (err)
1741 break;
1742 }
1743 zap_cursor_fini(&zc);
1744
1745 if (err) {
1746 dsl_dir_close(dd, FTAG);
1747 kmem_free(attr, sizeof (zap_attribute_t));
1748 return (err);
1749 }
1750 }
1751
1752 /*
1753 * Iterate over all snapshots.
1754 */
1755 if (flags & DS_FIND_SNAPSHOTS) {
1756 if (!dsl_pool_sync_context(dp))
1757 rw_enter(&dp->dp_config_rwlock, RW_READER);
1758 err = dsl_dataset_hold_obj(dp, thisobj, FTAG, &ds);
1759 if (!dsl_pool_sync_context(dp))
1760 rw_exit(&dp->dp_config_rwlock);
1761
1762 if (err == 0) {
1763 uint64_t snapobj = ds->ds_phys->ds_snapnames_zapobj;
1764 dsl_dataset_rele(ds, FTAG);
1765
1766 for (zap_cursor_init(&zc, dp->dp_meta_objset, snapobj);
1767 zap_cursor_retrieve(&zc, attr) == 0;
1768 (void) zap_cursor_advance(&zc)) {
1769 ASSERT(attr->za_integer_length ==
1770 sizeof (uint64_t));
1771 ASSERT(attr->za_num_integers == 1);
1772
1773 child = kmem_asprintf("%s@%s",
1774 name, attr->za_name);
1775 err = func(spa, attr->za_first_integer,
1776 child, arg);
1777 strfree(child);
1778 if (err)
1779 break;
1780 }
1781 zap_cursor_fini(&zc);
1782 }
1783 }
1784
1785 dsl_dir_close(dd, FTAG);
1786 kmem_free(attr, sizeof (zap_attribute_t));
1787
1788 if (err)
1789 return (err);
1790
1791 /*
1792 * Apply to self if appropriate.
1793 */
1794 err = func(spa, thisobj, name, arg);
1795 return (err);
1796 }
1797
1798 /* ARGSUSED */
1799 int
1800 dmu_objset_prefetch(const char *name, void *arg)
1801 {
1802 dsl_dataset_t *ds;
1803
1804 if (dsl_dataset_hold(name, FTAG, &ds))
1805 return (0);
1806
1807 if (!BP_IS_HOLE(&ds->ds_phys->ds_bp)) {
1808 mutex_enter(&ds->ds_opening_lock);
1809 if (ds->ds_objset == NULL) {
1810 uint32_t aflags = ARC_NOWAIT | ARC_PREFETCH;
1811 zbookmark_t zb;
1812
1813 SET_BOOKMARK(&zb, ds->ds_object, ZB_ROOT_OBJECT,
1814 ZB_ROOT_LEVEL, ZB_ROOT_BLKID);
1815
1816 (void) dsl_read_nolock(NULL, dsl_dataset_get_spa(ds),
1817 &ds->ds_phys->ds_bp, NULL, NULL,
1818 ZIO_PRIORITY_ASYNC_READ,
1819 ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE,
1820 &aflags, &zb);
1821 }
1822 mutex_exit(&ds->ds_opening_lock);
1823 }
1824
1825 dsl_dataset_rele(ds, FTAG);
1826 return (0);
1827 }
1828
1829 void
1830 dmu_objset_set_user(objset_t *os, void *user_ptr)
1831 {
1832 ASSERT(MUTEX_HELD(&os->os_user_ptr_lock));
1833 os->os_user_ptr = user_ptr;
1834 }
1835
1836 void *
1837 dmu_objset_get_user(objset_t *os)
1838 {
1839 ASSERT(MUTEX_HELD(&os->os_user_ptr_lock));
1840 return (os->os_user_ptr);
1841 }