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.
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.
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]
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.
27 /* Portions Copyright 2010 Robert Milkowski */
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>
41 #include <sys/dmu_tx.h>
44 #include <sys/dmu_impl.h>
45 #include <sys/zfs_ioctl.h>
47 #include <sys/zfs_onexit.h>
48 #include <sys/dsl_destroy.h>
51 * Needed to close a window in dnode_move() that allows the objset to be freed
52 * before it can be safely accessed.
59 rw_init(&os_lock, NULL, RW_DEFAULT, NULL);
69 dmu_objset_spa(objset_t *os)
75 dmu_objset_zil(objset_t *os)
81 dmu_objset_pool(objset_t *os)
85 if ((ds = os->os_dsl_dataset) != NULL && ds->ds_dir)
86 return (ds->ds_dir->dd_pool);
88 return (spa_get_dsl(os->os_spa));
92 dmu_objset_ds(objset_t *os)
94 return (os->os_dsl_dataset);
98 dmu_objset_type(objset_t *os)
100 return (os->os_phys->os_type);
104 dmu_objset_name(objset_t *os, char *buf)
106 dsl_dataset_name(os->os_dsl_dataset, buf);
110 dmu_objset_id(objset_t *os)
112 dsl_dataset_t *ds = os->os_dsl_dataset;
114 return (ds ? ds->ds_object : 0);
118 dmu_objset_syncprop(objset_t *os)
120 return (os->os_sync);
124 dmu_objset_logbias(objset_t *os)
126 return (os->os_logbias);
130 checksum_changed_cb(void *arg, uint64_t newval)
135 * Inheritance should have been done by now.
137 ASSERT(newval != ZIO_CHECKSUM_INHERIT);
139 os->os_checksum = zio_checksum_select(newval, ZIO_CHECKSUM_ON_VALUE);
143 compression_changed_cb(void *arg, uint64_t newval)
148 * Inheritance and range checking should have been done by now.
150 ASSERT(newval != ZIO_COMPRESS_INHERIT);
152 os->os_compress = zio_compress_select(newval, ZIO_COMPRESS_ON_VALUE);
156 copies_changed_cb(void *arg, uint64_t newval)
161 * Inheritance and range checking should have been done by now.
164 ASSERT(newval <= spa_max_replication(os->os_spa));
166 os->os_copies = newval;
170 dedup_changed_cb(void *arg, uint64_t newval)
173 spa_t *spa = os->os_spa;
174 enum zio_checksum checksum;
177 * Inheritance should have been done by now.
179 ASSERT(newval != ZIO_CHECKSUM_INHERIT);
181 checksum = zio_checksum_dedup_select(spa, newval, ZIO_CHECKSUM_OFF);
183 os->os_dedup_checksum = checksum & ZIO_CHECKSUM_MASK;
184 os->os_dedup_verify = !!(checksum & ZIO_CHECKSUM_VERIFY);
188 primary_cache_changed_cb(void *arg, uint64_t newval)
193 * Inheritance and range checking should have been done by now.
195 ASSERT(newval == ZFS_CACHE_ALL || newval == ZFS_CACHE_NONE ||
196 newval == ZFS_CACHE_METADATA);
198 os->os_primary_cache = newval;
202 secondary_cache_changed_cb(void *arg, uint64_t newval)
207 * Inheritance and range checking should have been done by now.
209 ASSERT(newval == ZFS_CACHE_ALL || newval == ZFS_CACHE_NONE ||
210 newval == ZFS_CACHE_METADATA);
212 os->os_secondary_cache = newval;
216 sync_changed_cb(void *arg, uint64_t newval)
221 * Inheritance and range checking should have been done by now.
223 ASSERT(newval == ZFS_SYNC_STANDARD || newval == ZFS_SYNC_ALWAYS ||
224 newval == ZFS_SYNC_DISABLED);
226 os->os_sync = newval;
228 zil_set_sync(os->os_zil, newval);
232 logbias_changed_cb(void *arg, uint64_t newval)
236 ASSERT(newval == ZFS_LOGBIAS_LATENCY ||
237 newval == ZFS_LOGBIAS_THROUGHPUT);
238 os->os_logbias = newval;
240 zil_set_logbias(os->os_zil, newval);
244 dmu_objset_byteswap(void *buf, size_t size)
246 objset_phys_t *osp = buf;
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);
260 dmu_objset_open_impl(spa_t *spa, dsl_dataset_t *ds, blkptr_t *bp,
266 ASSERT(ds == NULL || MUTEX_HELD(&ds->ds_opening_lock));
268 os = kmem_zalloc(sizeof (objset_t), KM_SLEEP);
269 os->os_dsl_dataset = ds;
272 if (!BP_IS_HOLE(os->os_rootbp)) {
273 uint32_t aflags = ARC_WAIT;
275 SET_BOOKMARK(&zb, ds ? ds->ds_object : DMU_META_OBJSET,
276 ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID);
278 if (DMU_OS_IS_L2CACHEABLE(os))
279 aflags |= ARC_L2CACHE;
280 if (DMU_OS_IS_L2COMPRESSIBLE(os))
281 aflags |= ARC_L2COMPRESS;
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);
288 kmem_free(os, sizeof (objset_t));
289 /* convert checksum errors into IO errors */
291 err = SET_ERROR(EIO);
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,
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,
306 os->os_phys_buf = buf;
309 os->os_phys = os->os_phys_buf->b_data;
310 os->os_flags = os->os_phys->os_flags;
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);
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.
327 err = dsl_prop_register(ds,
328 zfs_prop_to_name(ZFS_PROP_PRIMARYCACHE),
329 primary_cache_changed_cb, os);
331 err = dsl_prop_register(ds,
332 zfs_prop_to_name(ZFS_PROP_SECONDARYCACHE),
333 secondary_cache_changed_cb, os);
335 if (!dsl_dataset_is_snapshot(ds)) {
337 err = dsl_prop_register(ds,
338 zfs_prop_to_name(ZFS_PROP_CHECKSUM),
339 checksum_changed_cb, os);
342 err = dsl_prop_register(ds,
343 zfs_prop_to_name(ZFS_PROP_COMPRESSION),
344 compression_changed_cb, os);
347 err = dsl_prop_register(ds,
348 zfs_prop_to_name(ZFS_PROP_COPIES),
349 copies_changed_cb, os);
352 err = dsl_prop_register(ds,
353 zfs_prop_to_name(ZFS_PROP_DEDUP),
354 dedup_changed_cb, os);
357 err = dsl_prop_register(ds,
358 zfs_prop_to_name(ZFS_PROP_LOGBIAS),
359 logbias_changed_cb, os);
362 err = dsl_prop_register(ds,
363 zfs_prop_to_name(ZFS_PROP_SYNC),
364 sync_changed_cb, os);
368 VERIFY(arc_buf_remove_ref(os->os_phys_buf,
370 kmem_free(os, sizeof (objset_t));
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;
382 os->os_primary_cache = ZFS_CACHE_ALL;
383 os->os_secondary_cache = ZFS_CACHE_ALL;
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);
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]));
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));
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);
405 DMU_META_DNODE(os) = dnode_special_open(os,
406 &os->os_phys->os_meta_dnode, DMU_META_DNODE_OBJECT,
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);
418 * We should be the only thread trying to do this because we
419 * have ds_opening_lock
422 mutex_enter(&ds->ds_lock);
423 ASSERT(ds->ds_objset == NULL);
425 mutex_exit(&ds->ds_lock);
433 dmu_objset_from_ds(dsl_dataset_t *ds, objset_t **osp)
437 mutex_enter(&ds->ds_opening_lock);
438 *osp = ds->ds_objset;
440 err = dmu_objset_open_impl(dsl_dataset_get_spa(ds),
441 ds, dsl_dataset_get_blkptr(ds), osp);
443 mutex_exit(&ds->ds_opening_lock);
448 * Holds the pool while the objset is held. Therefore only one objset
449 * can be held at a time.
452 dmu_objset_hold(const char *name, void *tag, objset_t **osp)
458 err = dsl_pool_hold(name, tag, &dp);
461 err = dsl_dataset_hold(dp, name, tag, &ds);
463 dsl_pool_rele(dp, tag);
467 err = dmu_objset_from_ds(ds, osp);
469 dsl_dataset_rele(ds, tag);
470 dsl_pool_rele(dp, tag);
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.
482 dmu_objset_own(const char *name, dmu_objset_type_t type,
483 boolean_t readonly, void *tag, objset_t **osp)
489 err = dsl_pool_hold(name, FTAG, &dp);
492 err = dsl_dataset_own(dp, name, tag, &ds);
494 dsl_pool_rele(dp, FTAG);
498 err = dmu_objset_from_ds(ds, osp);
499 dsl_pool_rele(dp, FTAG);
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));
513 dmu_objset_rele(objset_t *os, void *tag)
515 dsl_pool_t *dp = dmu_objset_pool(os);
516 dsl_dataset_rele(os->os_dsl_dataset, tag);
517 dsl_pool_rele(dp, tag);
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
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.
532 dmu_objset_refresh_ownership(objset_t *os, void *tag)
535 dsl_dataset_t *ds, *newds;
536 char name[MAXNAMELEN];
538 ds = os->os_dsl_dataset;
539 VERIFY3P(ds, !=, NULL);
540 VERIFY3P(ds->ds_owner, ==, tag);
541 VERIFY(dsl_dataset_long_held(ds));
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);
553 dmu_objset_disown(objset_t *os, void *tag)
555 dsl_dataset_disown(os->os_dsl_dataset, tag);
559 dmu_objset_evict_dbufs(objset_t *os)
563 mutex_enter(&os->os_lock);
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));
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
575 for (dn = list_head(&os->os_dnodes);
576 dn && !dnode_add_ref(dn, FTAG);
577 dn = list_next(&os->os_dnodes, dn))
581 dnode_t *next_dn = dn;
584 next_dn = list_next(&os->os_dnodes, next_dn);
585 } while (next_dn && !dnode_add_ref(next_dn, FTAG));
587 mutex_exit(&os->os_lock);
588 dnode_evict_dbufs(dn);
589 dnode_rele(dn, FTAG);
590 mutex_enter(&os->os_lock);
593 mutex_exit(&os->os_lock);
597 dmu_objset_evict(objset_t *os)
599 dsl_dataset_t *ds = os->os_dsl_dataset;
601 for (int t = 0; t < TXG_SIZE; t++)
602 ASSERT(!dmu_objset_is_dirty(os, t));
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));
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));
636 dmu_objset_evict_dbufs(os);
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);
643 zil_free(os->os_zil);
645 ASSERT3P(list_head(&os->os_dnodes), ==, NULL);
647 VERIFY(arc_buf_remove_ref(os->os_phys_buf, &os->os_phys_buf));
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
655 rw_enter(&os_lock, RW_READER);
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));
665 dmu_objset_snap_cmtime(objset_t *os)
667 return (dsl_dir_snap_cmtime(os->os_dsl_dataset->ds_dir));
670 /* called from dsl for meta-objset */
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)
678 ASSERT(dmu_tx_is_syncing(tx));
681 VERIFY0(dmu_objset_from_ds(ds, &os));
683 VERIFY0(dmu_objset_open_impl(spa, NULL, bp, &os));
685 mdn = DMU_META_DNODE(os);
687 dnode_allocate(mdn, DMU_OT_DNODE, 1 << DNODE_BLOCK_SHIFT,
688 DN_MAX_INDBLKSHIFT, DMU_OT_NONE, 0, tx);
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.
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.
705 * Determine the number of levels necessary for the meta-dnode
706 * to contain DN_MAX_OBJECT dnodes.
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))
713 mdn->dn_next_nlevels[tx->tx_txg & TXG_MASK] =
714 mdn->dn_nlevels = levels;
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;
726 dsl_dataset_dirty(ds, tx);
731 typedef struct dmu_objset_create_arg {
732 const char *doca_name;
734 void (*doca_userfunc)(objset_t *os, void *arg,
735 cred_t *cr, dmu_tx_t *tx);
737 dmu_objset_type_t doca_type;
739 } dmu_objset_create_arg_t;
743 dmu_objset_create_check(void *arg, dmu_tx_t *tx)
745 dmu_objset_create_arg_t *doca = arg;
746 dsl_pool_t *dp = dmu_tx_pool(tx);
751 if (strchr(doca->doca_name, '@') != NULL)
752 return (SET_ERROR(EINVAL));
754 error = dsl_dir_hold(dp, doca->doca_name, FTAG, &pdd, &tail);
758 dsl_dir_rele(pdd, FTAG);
759 return (SET_ERROR(EEXIST));
761 dsl_dir_rele(pdd, FTAG);
767 dmu_objset_create_sync(void *arg, dmu_tx_t *tx)
769 dmu_objset_create_arg_t *doca = arg;
770 dsl_pool_t *dp = dmu_tx_pool(tx);
778 VERIFY0(dsl_dir_hold(dp, doca->doca_name, FTAG, &pdd, &tail));
780 obj = dsl_dataset_create_sync(pdd, tail, NULL, doca->doca_flags,
781 doca->doca_cred, tx);
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);
788 if (doca->doca_userfunc != NULL) {
789 doca->doca_userfunc(os, doca->doca_userarg,
790 doca->doca_cred, tx);
793 spa_history_log_internal_ds(ds, "create", tx, "");
794 dsl_dataset_rele(ds, FTAG);
795 dsl_dir_rele(pdd, FTAG);
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)
802 dmu_objset_create_arg_t doca;
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;
811 return (dsl_sync_task(name,
812 dmu_objset_create_check, dmu_objset_create_sync, &doca, 5));
815 typedef struct dmu_objset_clone_arg {
816 const char *doca_clone;
817 const char *doca_origin;
819 } dmu_objset_clone_arg_t;
823 dmu_objset_clone_check(void *arg, dmu_tx_t *tx)
825 dmu_objset_clone_arg_t *doca = arg;
829 dsl_dataset_t *origin;
830 dsl_pool_t *dp = dmu_tx_pool(tx);
832 if (strchr(doca->doca_clone, '@') != NULL)
833 return (SET_ERROR(EINVAL));
835 error = dsl_dir_hold(dp, doca->doca_clone, FTAG, &pdd, &tail);
839 dsl_dir_rele(pdd, FTAG);
840 return (SET_ERROR(EEXIST));
842 /* You can't clone across pools. */
843 if (pdd->dd_pool != dp) {
844 dsl_dir_rele(pdd, FTAG);
845 return (SET_ERROR(EXDEV));
847 dsl_dir_rele(pdd, FTAG);
849 error = dsl_dataset_hold(dp, doca->doca_origin, FTAG, &origin);
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));
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));
864 dsl_dataset_rele(origin, FTAG);
870 dmu_objset_clone_sync(void *arg, dmu_tx_t *tx)
872 dmu_objset_clone_arg_t *doca = arg;
873 dsl_pool_t *dp = dmu_tx_pool(tx);
876 dsl_dataset_t *origin, *ds;
878 char namebuf[MAXNAMELEN];
880 VERIFY0(dsl_dir_hold(dp, doca->doca_clone, FTAG, &pdd, &tail));
881 VERIFY0(dsl_dataset_hold(dp, doca->doca_origin, FTAG, &origin));
883 obj = dsl_dataset_create_sync(pdd, tail, origin, 0,
884 doca->doca_cred, tx);
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);
896 dmu_objset_clone(const char *clone, const char *origin)
898 dmu_objset_clone_arg_t doca;
900 doca.doca_clone = clone;
901 doca.doca_origin = origin;
902 doca.doca_cred = CRED();
904 return (dsl_sync_task(clone,
905 dmu_objset_clone_check, dmu_objset_clone_sync, &doca, 5));
909 dmu_objset_snapshot_one(const char *fsname, const char *snapname)
912 char *longsnap = kmem_asprintf("%s@%s", fsname, snapname);
913 nvlist_t *snaps = fnvlist_alloc();
915 fnvlist_add_boolean(snaps, longsnap);
917 err = dsl_dataset_snapshot(snaps, NULL, NULL);
923 dmu_objset_sync_dnodes(list_t *list, list_t *newlist, dmu_tx_t *tx)
927 while (dn = list_head(list)) {
928 ASSERT(dn->dn_object != DMU_META_DNODE_OBJECT);
929 ASSERT(dn->dn_dbuf->db_data_pending);
931 * Initialize dn_zio outside dnode_sync() because the
932 * meta-dnode needs to set it ouside dnode_sync().
934 dn->dn_zio = dn->dn_dbuf->db_data_pending->dr_zio;
937 ASSERT3U(dn->dn_nlevels, <=, DN_MAX_LEVELS);
938 list_remove(list, dn);
941 (void) dnode_add_ref(dn, newlist);
942 list_insert_tail(newlist, dn);
951 dmu_objset_write_ready(zio_t *zio, arc_buf_t *abuf, void *arg)
953 blkptr_t *bp = zio->io_bp;
955 dnode_phys_t *dnp = &os->os_phys->os_meta_dnode;
957 ASSERT3P(bp, ==, os->os_rootbp);
958 ASSERT3U(BP_GET_TYPE(bp), ==, DMU_OT_OBJSET);
959 ASSERT0(BP_GET_LEVEL(bp));
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).
968 for (int i = 0; i < dnp->dn_nblkptr; i++)
969 bp->blk_fill += dnp->dn_blkptr[i].blk_fill;
974 dmu_objset_write_done(zio_t *zio, arc_buf_t *abuf, void *arg)
976 blkptr_t *bp = zio->io_bp;
977 blkptr_t *bp_orig = &zio->io_bp_orig;
980 if (zio->io_flags & ZIO_FLAG_IO_REWRITE) {
981 ASSERT(BP_EQUAL(bp, bp_orig));
983 dsl_dataset_t *ds = os->os_dsl_dataset;
984 dmu_tx_t *tx = os->os_synctx;
986 (void) dsl_dataset_block_kill(ds, bp_orig, tx, B_TRUE);
987 dsl_dataset_block_born(ds, bp, tx);
991 /* called from dsl */
993 dmu_objset_sync(objset_t *os, zio_t *pio, dmu_tx_t *tx)
1000 list_t *newlist = NULL;
1001 dbuf_dirty_record_t *dr;
1003 dprintf_ds(os->os_dsl_dataset, "txg=%llu\n", tx->tx_txg);
1005 ASSERT(dmu_tx_is_syncing(tx));
1006 /* XXX the write_done callback should really give us the tx... */
1009 if (os->os_dsl_dataset == NULL) {
1011 * This is the MOS. If we have upgraded,
1012 * spa_max_replication() could change, so reset
1015 os->os_copies = spa_max_replication(os->os_spa);
1019 * Create the root block IO
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);
1026 dmu_write_policy(os, NULL, 0, 0, &zp);
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 NULL, dmu_objset_write_done, os, ZIO_PRIORITY_ASYNC_WRITE,
1032 ZIO_FLAG_MUSTSUCCEED, &zb);
1035 * Sync special dnodes - the parent IO for the sync is the root block
1037 DMU_META_DNODE(os)->dn_zio = zio;
1038 dnode_sync(DMU_META_DNODE(os), tx);
1040 os->os_phys->os_flags = os->os_flags;
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);
1050 txgoff = tx->tx_txg & TXG_MASK;
1052 if (dmu_objset_userused_enabled(os)) {
1053 newlist = &os->os_synced_dnodes;
1055 * We must create the list here because it uses the
1056 * dn_dirty_link[] of this txg.
1058 list_create(newlist, sizeof (dnode_t),
1059 offsetof(dnode_t, dn_dirty_link[txgoff]));
1062 dmu_objset_sync_dnodes(&os->os_free_dnodes[txgoff], newlist, tx);
1063 dmu_objset_sync_dnodes(&os->os_dirty_dnodes[txgoff], newlist, tx);
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);
1070 zio_nowait(dr->dr_zio);
1073 * Free intent log blocks up to this tx.
1075 zil_sync(os->os_zil, tx);
1076 os->os_phys->os_zil_header = os->os_zil_header;
1081 dmu_objset_is_dirty(objset_t *os, uint64_t txg)
1083 return (!list_is_empty(&os->os_dirty_dnodes[txg & TXG_MASK]) ||
1084 !list_is_empty(&os->os_free_dnodes[txg & TXG_MASK]));
1087 static objset_used_cb_t *used_cbs[DMU_OST_NUMTYPES];
1090 dmu_objset_register_type(dmu_objset_type_t ost, objset_used_cb_t *cb)
1096 dmu_objset_userused_enabled(objset_t *os)
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);
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)
1107 if ((flags & DNODE_FLAG_USERUSED_ACCOUNTED)) {
1108 int64_t delta = DNODE_SIZE + used;
1111 VERIFY3U(0, ==, zap_increment_int(os, DMU_USERUSED_OBJECT,
1113 VERIFY3U(0, ==, zap_increment_int(os, DMU_GROUPUSED_OBJECT,
1119 dmu_objset_do_userquota_updates(objset_t *os, dmu_tx_t *tx)
1122 list_t *list = &os->os_synced_dnodes;
1124 ASSERT(list_head(list) == NULL || dmu_objset_userused_enabled(os));
1126 while (dn = list_head(list)) {
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);
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));
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
1151 flags = dn->dn_id_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);
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);
1163 mutex_enter(&dn->dn_mtx);
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;
1173 dn->dn_id_flags |= DN_ID_CHKED_BONUS;
1175 dn->dn_id_flags &= ~(DN_ID_NEW_EXIST);
1176 mutex_exit(&dn->dn_mtx);
1178 list_remove(list, dn);
1179 dnode_rele(dn, list);
1184 * Returns a pointer to data to find uid/gid from
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.
1191 dmu_objset_userquota_find_data(dmu_buf_impl_t *db, dmu_tx_t *tx)
1193 dbuf_dirty_record_t *dr, **drp;
1196 if (db->db_dirtycnt == 0)
1197 return (db->db.db_data); /* Nothing is changing */
1199 for (drp = &db->db_last_dirty; (dr = *drp) != NULL; drp = &dr->dr_next)
1200 if (dr->dr_txg == tx->tx_txg)
1208 DB_DNODE_ENTER(dr->dr_dbuf);
1209 dn = DB_DNODE(dr->dr_dbuf);
1211 if (dn->dn_bonuslen == 0 &&
1212 dr->dr_dbuf->db_blkid == DMU_SPILL_BLKID)
1213 data = dr->dt.dl.dr_data->b_data;
1215 data = dr->dt.dl.dr_data;
1217 DB_DNODE_EXIT(dr->dr_dbuf);
1224 dmu_objset_userquota_get_ids(dnode_t *dn, boolean_t before, dmu_tx_t *tx)
1226 objset_t *os = dn->dn_objset;
1228 dmu_buf_impl_t *db = NULL;
1229 uint64_t *user = NULL;
1230 uint64_t *group = NULL;
1231 int flags = dn->dn_id_flags;
1233 boolean_t have_spill = B_FALSE;
1235 if (!dmu_objset_userused_enabled(dn->dn_objset))
1238 if (before && (flags & (DN_ID_CHKED_BONUS|DN_ID_OLD_EXIST|
1239 DN_ID_CHKED_SPILL)))
1242 if (before && dn->dn_bonuslen != 0)
1243 data = DN_BONUS(dn->dn_phys);
1244 else if (!before && dn->dn_bonuslen != 0) {
1247 mutex_enter(&db->db_mtx);
1248 data = dmu_objset_userquota_find_data(db, tx);
1250 data = DN_BONUS(dn->dn_phys);
1252 } else if (dn->dn_bonuslen == 0 && dn->dn_bonustype == DMU_OT_SA) {
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);
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;
1266 mutex_enter(&dn->dn_mtx);
1267 dn->dn_id_flags |= DN_ID_CHKED_BONUS;
1268 mutex_exit(&dn->dn_mtx);
1274 user = &dn->dn_olduid;
1275 group = &dn->dn_oldgid;
1277 user = &dn->dn_newuid;
1278 group = &dn->dn_newgid;
1282 * Must always call the callback in case the object
1283 * type has changed and that type isn't an object type to track
1285 error = used_cbs[os->os_phys->os_type](dn->dn_bonustype, data,
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.
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;
1307 mutex_exit(&db->db_mtx);
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;
1316 dn->dn_id_flags |= DN_ID_CHKED_SPILL;
1318 dn->dn_id_flags |= DN_ID_CHKED_BONUS;
1320 mutex_exit(&dn->dn_mtx);
1322 dmu_buf_rele((dmu_buf_t *)db, FTAG);
1326 dmu_objset_userspace_present(objset_t *os)
1328 return (os->os_phys->os_flags &
1329 OBJSET_FLAG_USERACCOUNTING_COMPLETE);
1333 dmu_objset_userspace_upgrade(objset_t *os)
1338 if (dmu_objset_userspace_present(os))
1340 if (!dmu_objset_userused_enabled(os))
1341 return (SET_ERROR(ENOTSUP));
1342 if (dmu_objset_is_snapshot(os))
1343 return (SET_ERROR(EINVAL));
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
1353 for (obj = 0; err == 0; err = dmu_object_next(os, &obj, FALSE, 0)) {
1358 if (issig(JUSTLOOKING) && issig(FORREAL))
1359 return (SET_ERROR(EINTR));
1361 objerr = dmu_bonus_hold(os, obj, FTAG, &db);
1364 tx = dmu_tx_create(os);
1365 dmu_tx_hold_bonus(tx, obj);
1366 objerr = dmu_tx_assign(tx, TXG_WAIT);
1371 dmu_buf_will_dirty(db, tx);
1372 dmu_buf_rele(db, FTAG);
1376 os->os_flags |= OBJSET_FLAG_USERACCOUNTING_COMPLETE;
1377 txg_wait_synced(dmu_objset_pool(os), 0);
1382 dmu_objset_space(objset_t *os, uint64_t *refdbytesp, uint64_t *availbytesp,
1383 uint64_t *usedobjsp, uint64_t *availobjsp)
1385 dsl_dataset_space(os->os_dsl_dataset, refdbytesp, availbytesp,
1386 usedobjsp, availobjsp);
1390 dmu_objset_fsid_guid(objset_t *os)
1392 return (dsl_dataset_fsid_guid(os->os_dsl_dataset));
1396 dmu_objset_fast_stat(objset_t *os, dmu_objset_stats_t *stat)
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);
1404 dmu_objset_stats(objset_t *os, nvlist_t *nv)
1406 ASSERT(os->os_dsl_dataset ||
1407 os->os_phys->os_type == DMU_OST_META);
1409 if (os->os_dsl_dataset != NULL)
1410 dsl_dataset_stats(os->os_dsl_dataset, nv);
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));
1419 dmu_objset_is_snapshot(objset_t *os)
1421 if (os->os_dsl_dataset != NULL)
1422 return (dsl_dataset_is_snapshot(os->os_dsl_dataset));
1428 dmu_snapshot_realname(objset_t *os, char *name, char *real, int maxlen,
1429 boolean_t *conflict)
1431 dsl_dataset_t *ds = os->os_dsl_dataset;
1434 if (ds->ds_phys->ds_snapnames_zapobj == 0)
1435 return (SET_ERROR(ENOENT));
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));
1443 dmu_snapshot_list_next(objset_t *os, int namelen, char *name,
1444 uint64_t *idp, uint64_t *offp, boolean_t *case_conflict)
1446 dsl_dataset_t *ds = os->os_dsl_dataset;
1447 zap_cursor_t cursor;
1448 zap_attribute_t attr;
1450 ASSERT(dsl_pool_config_held(dmu_objset_pool(os)));
1452 if (ds->ds_phys->ds_snapnames_zapobj == 0)
1453 return (SET_ERROR(ENOENT));
1455 zap_cursor_init_serialized(&cursor,
1456 ds->ds_dir->dd_pool->dp_meta_objset,
1457 ds->ds_phys->ds_snapnames_zapobj, *offp);
1459 if (zap_cursor_retrieve(&cursor, &attr) != 0) {
1460 zap_cursor_fini(&cursor);
1461 return (SET_ERROR(ENOENT));
1464 if (strlen(attr.za_name) + 1 > namelen) {
1465 zap_cursor_fini(&cursor);
1466 return (SET_ERROR(ENAMETOOLONG));
1469 (void) strcpy(name, attr.za_name);
1471 *idp = attr.za_first_integer;
1473 *case_conflict = attr.za_normalization_conflict;
1474 zap_cursor_advance(&cursor);
1475 *offp = zap_cursor_serialize(&cursor);
1476 zap_cursor_fini(&cursor);
1482 dmu_dir_list_next(objset_t *os, int namelen, char *name,
1483 uint64_t *idp, uint64_t *offp)
1485 dsl_dir_t *dd = os->os_dsl_dataset->ds_dir;
1486 zap_cursor_t cursor;
1487 zap_attribute_t attr;
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));
1494 zap_cursor_init_serialized(&cursor,
1495 dd->dd_pool->dp_meta_objset,
1496 dd->dd_phys->dd_child_dir_zapobj, *offp);
1498 if (zap_cursor_retrieve(&cursor, &attr) != 0) {
1499 zap_cursor_fini(&cursor);
1500 return (SET_ERROR(ENOENT));
1503 if (strlen(attr.za_name) + 1 > namelen) {
1504 zap_cursor_fini(&cursor);
1505 return (SET_ERROR(ENAMETOOLONG));
1508 (void) strcpy(name, attr.za_name);
1510 *idp = attr.za_first_integer;
1511 zap_cursor_advance(&cursor);
1512 *offp = zap_cursor_serialize(&cursor);
1513 zap_cursor_fini(&cursor);
1519 * Find objsets under and including ddobj, call func(ds) on each.
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)
1528 zap_attribute_t *attr;
1532 ASSERT(dsl_pool_config_held(dp));
1534 err = dsl_dir_hold_obj(dp, ddobj, NULL, FTAG, &dd);
1538 /* Don't visit hidden ($MOS & $ORIGIN) objsets. */
1539 if (dd->dd_myname[0] == '$') {
1540 dsl_dir_rele(dd, FTAG);
1544 thisobj = dd->dd_phys->dd_head_dataset_obj;
1545 attr = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP);
1548 * Iterate over all children.
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, ==,
1557 ASSERT3U(attr->za_num_integers, ==, 1);
1559 err = dmu_objset_find_dp(dp, attr->za_first_integer,
1564 zap_cursor_fini(&zc);
1567 dsl_dir_rele(dd, FTAG);
1568 kmem_free(attr, sizeof (zap_attribute_t));
1574 * Iterate over all snapshots.
1576 if (flags & DS_FIND_SNAPSHOTS) {
1578 err = dsl_dataset_hold_obj(dp, thisobj, FTAG, &ds);
1581 uint64_t snapobj = ds->ds_phys->ds_snapnames_zapobj;
1582 dsl_dataset_rele(ds, FTAG);
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, ==,
1589 ASSERT3U(attr->za_num_integers, ==, 1);
1591 err = dsl_dataset_hold_obj(dp,
1592 attr->za_first_integer, FTAG, &ds);
1595 err = func(dp, ds, arg);
1596 dsl_dataset_rele(ds, FTAG);
1600 zap_cursor_fini(&zc);
1604 dsl_dir_rele(dd, FTAG);
1605 kmem_free(attr, sizeof (zap_attribute_t));
1613 err = dsl_dataset_hold_obj(dp, thisobj, FTAG, &ds);
1616 err = func(dp, ds, arg);
1617 dsl_dataset_rele(ds, FTAG);
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.
1629 dmu_objset_find_impl(spa_t *spa, const char *name,
1630 int func(const char *, void *), void *arg, int flags)
1633 dsl_pool_t *dp = spa_get_dsl(spa);
1636 zap_attribute_t *attr;
1641 dsl_pool_config_enter(dp, FTAG);
1643 err = dsl_dir_hold(dp, name, FTAG, &dd, NULL);
1645 dsl_pool_config_exit(dp, FTAG);
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);
1656 thisobj = dd->dd_phys->dd_head_dataset_obj;
1657 attr = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP);
1660 * Iterate over all children.
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, ==,
1669 ASSERT3U(attr->za_num_integers, ==, 1);
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,
1675 dsl_pool_config_enter(dp, FTAG);
1680 zap_cursor_fini(&zc);
1683 dsl_dir_rele(dd, FTAG);
1684 dsl_pool_config_exit(dp, FTAG);
1685 kmem_free(attr, sizeof (zap_attribute_t));
1691 * Iterate over all snapshots.
1693 if (flags & DS_FIND_SNAPSHOTS) {
1694 err = dsl_dataset_hold_obj(dp, thisobj, FTAG, &ds);
1697 uint64_t snapobj = ds->ds_phys->ds_snapnames_zapobj;
1698 dsl_dataset_rele(ds, FTAG);
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, ==,
1705 ASSERT3U(attr->za_num_integers, ==, 1);
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);
1716 zap_cursor_fini(&zc);
1720 dsl_dir_rele(dd, FTAG);
1721 kmem_free(attr, sizeof (zap_attribute_t));
1722 dsl_pool_config_exit(dp, FTAG);
1727 /* Apply to self. */
1728 return (func(name, arg));
1732 * See comment above dmu_objset_find_impl().
1735 dmu_objset_find(char *name, int func(const char *, void *), void *arg,
1741 error = spa_open(name, &spa, FTAG);
1744 error = dmu_objset_find_impl(spa, name, func, arg, flags);
1745 spa_close(spa, FTAG);
1750 dmu_objset_set_user(objset_t *os, void *user_ptr)
1752 ASSERT(MUTEX_HELD(&os->os_user_ptr_lock));
1753 os->os_user_ptr = user_ptr;
1757 dmu_objset_get_user(objset_t *os)
1759 ASSERT(MUTEX_HELD(&os->os_user_ptr_lock));
1760 return (os->os_user_ptr);
1764 * Determine name of filesystem, given name of snapshot.
1765 * buf must be at least MAXNAMELEN bytes
1768 dmu_fsname(const char *snapname, char *buf)
1770 char *atp = strchr(snapname, '@');
1772 return (SET_ERROR(EINVAL));
1773 if (atp - snapname >= MAXNAMELEN)
1774 return (SET_ERROR(ENAMETOOLONG));
1775 (void) strlcpy(buf, snapname, atp - snapname + 1);