6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Copyright (c) 2012, 2014 by Delphix. All rights reserved.
24 * Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
25 * Copyright (c) 2013, Joyent, Inc. All rights reserved.
26 */
27
28 /* Portions Copyright 2010 Robert Milkowski */
29
30 #include <sys/cred.h>
31 #include <sys/zfs_context.h>
32 #include <sys/dmu_objset.h>
33 #include <sys/dsl_dir.h>
34 #include <sys/dsl_dataset.h>
35 #include <sys/dsl_prop.h>
36 #include <sys/dsl_pool.h>
37 #include <sys/dsl_synctask.h>
38 #include <sys/dsl_deleg.h>
39 #include <sys/dnode.h>
40 #include <sys/dbuf.h>
41 #include <sys/zvol.h>
42 #include <sys/dmu_tx.h>
43 #include <sys/zap.h>
44 #include <sys/zil.h>
45 #include <sys/dmu_impl.h>
338 &os->os_phys_buf, ARC_BUFC_METADATA);
339 os->os_phys = os->os_phys_buf->b_data;
340 bzero(os->os_phys, size);
341 }
342
343 /*
344 * Note: the changed_cb will be called once before the register
345 * func returns, thus changing the checksum/compression from the
346 * default (fletcher2/off). Snapshots don't need to know about
347 * checksum/compression/copies.
348 */
349 if (ds != NULL) {
350 err = dsl_prop_register(ds,
351 zfs_prop_to_name(ZFS_PROP_PRIMARYCACHE),
352 primary_cache_changed_cb, os);
353 if (err == 0) {
354 err = dsl_prop_register(ds,
355 zfs_prop_to_name(ZFS_PROP_SECONDARYCACHE),
356 secondary_cache_changed_cb, os);
357 }
358 if (!dsl_dataset_is_snapshot(ds)) {
359 if (err == 0) {
360 err = dsl_prop_register(ds,
361 zfs_prop_to_name(ZFS_PROP_CHECKSUM),
362 checksum_changed_cb, os);
363 }
364 if (err == 0) {
365 err = dsl_prop_register(ds,
366 zfs_prop_to_name(ZFS_PROP_COMPRESSION),
367 compression_changed_cb, os);
368 }
369 if (err == 0) {
370 err = dsl_prop_register(ds,
371 zfs_prop_to_name(ZFS_PROP_COPIES),
372 copies_changed_cb, os);
373 }
374 if (err == 0) {
375 err = dsl_prop_register(ds,
376 zfs_prop_to_name(ZFS_PROP_DEDUP),
377 dedup_changed_cb, os);
378 }
400 }
401 if (err != 0) {
402 VERIFY(arc_buf_remove_ref(os->os_phys_buf,
403 &os->os_phys_buf));
404 kmem_free(os, sizeof (objset_t));
405 return (err);
406 }
407 } else {
408 /* It's the meta-objset. */
409 os->os_checksum = ZIO_CHECKSUM_FLETCHER_4;
410 os->os_compress = ZIO_COMPRESS_LZJB;
411 os->os_copies = spa_max_replication(spa);
412 os->os_dedup_checksum = ZIO_CHECKSUM_OFF;
413 os->os_dedup_verify = B_FALSE;
414 os->os_logbias = ZFS_LOGBIAS_LATENCY;
415 os->os_sync = ZFS_SYNC_STANDARD;
416 os->os_primary_cache = ZFS_CACHE_ALL;
417 os->os_secondary_cache = ZFS_CACHE_ALL;
418 }
419
420 if (ds == NULL || !dsl_dataset_is_snapshot(ds))
421 os->os_zil_header = os->os_phys->os_zil_header;
422 os->os_zil = zil_alloc(os, &os->os_zil_header);
423
424 for (i = 0; i < TXG_SIZE; i++) {
425 list_create(&os->os_dirty_dnodes[i], sizeof (dnode_t),
426 offsetof(dnode_t, dn_dirty_link[i]));
427 list_create(&os->os_free_dnodes[i], sizeof (dnode_t),
428 offsetof(dnode_t, dn_dirty_link[i]));
429 }
430 list_create(&os->os_dnodes, sizeof (dnode_t),
431 offsetof(dnode_t, dn_link));
432 list_create(&os->os_downgraded_dbufs, sizeof (dmu_buf_impl_t),
433 offsetof(dmu_buf_impl_t, db_link));
434
435 mutex_init(&os->os_lock, NULL, MUTEX_DEFAULT, NULL);
436 mutex_init(&os->os_obj_lock, NULL, MUTEX_DEFAULT, NULL);
437 mutex_init(&os->os_user_ptr_lock, NULL, MUTEX_DEFAULT, NULL);
438
439 DMU_META_DNODE(os) = dnode_special_open(os,
440 &os->os_phys->os_meta_dnode, DMU_META_DNODE_OBJECT,
441 &os->os_meta_dnode);
442 if (arc_buf_size(os->os_phys_buf) >= sizeof (objset_phys_t)) {
443 DMU_USERUSED_DNODE(os) = dnode_special_open(os,
444 &os->os_phys->os_userused_dnode, DMU_USERUSED_OBJECT,
445 &os->os_userused_dnode);
446 DMU_GROUPUSED_DNODE(os) = dnode_special_open(os,
447 &os->os_phys->os_groupused_dnode, DMU_GROUPUSED_OBJECT,
448 &os->os_groupused_dnode);
449 }
450
451 *osp = os;
452 return (0);
453 }
454
455 int
456 dmu_objset_from_ds(dsl_dataset_t *ds, objset_t **osp)
457 {
458 int err = 0;
459
460 mutex_enter(&ds->ds_opening_lock);
461 if (ds->ds_objset == NULL) {
462 objset_t *os;
463 err = dmu_objset_open_impl(dsl_dataset_get_spa(ds),
464 ds, dsl_dataset_get_blkptr(ds), &os);
465
466 if (err == 0) {
467 mutex_enter(&ds->ds_lock);
468 ASSERT(ds->ds_objset == NULL);
516 dsl_pool_t *dp;
517 dsl_dataset_t *ds;
518 int err;
519
520 err = dsl_pool_hold(name, FTAG, &dp);
521 if (err != 0)
522 return (err);
523 err = dsl_dataset_own(dp, name, tag, &ds);
524 if (err != 0) {
525 dsl_pool_rele(dp, FTAG);
526 return (err);
527 }
528
529 err = dmu_objset_from_ds(ds, osp);
530 dsl_pool_rele(dp, FTAG);
531 if (err != 0) {
532 dsl_dataset_disown(ds, tag);
533 } else if (type != DMU_OST_ANY && type != (*osp)->os_phys->os_type) {
534 dsl_dataset_disown(ds, tag);
535 return (SET_ERROR(EINVAL));
536 } else if (!readonly && dsl_dataset_is_snapshot(ds)) {
537 dsl_dataset_disown(ds, tag);
538 return (SET_ERROR(EROFS));
539 }
540 return (err);
541 }
542
543 void
544 dmu_objset_rele(objset_t *os, void *tag)
545 {
546 dsl_pool_t *dp = dmu_objset_pool(os);
547 dsl_dataset_rele(os->os_dsl_dataset, tag);
548 dsl_pool_rele(dp, tag);
549 }
550
551 /*
552 * When we are called, os MUST refer to an objset associated with a dataset
553 * that is owned by 'tag'; that is, is held and long held by 'tag' and ds_owner
554 * == tag. We will then release and reacquire ownership of the dataset while
555 * holding the pool config_rwlock to avoid intervening namespace or ownership
556 * changes may occur.
572 VERIFY(dsl_dataset_long_held(ds));
573
574 dsl_dataset_name(ds, name);
575 dp = dmu_objset_pool(os);
576 dsl_pool_config_enter(dp, FTAG);
577 dmu_objset_disown(os, tag);
578 VERIFY0(dsl_dataset_own(dp, name, tag, &newds));
579 VERIFY3P(newds, ==, os->os_dsl_dataset);
580 dsl_pool_config_exit(dp, FTAG);
581 }
582
583 void
584 dmu_objset_disown(objset_t *os, void *tag)
585 {
586 dsl_dataset_disown(os->os_dsl_dataset, tag);
587 }
588
589 void
590 dmu_objset_evict_dbufs(objset_t *os)
591 {
592 dnode_t *dn;
593
594 mutex_enter(&os->os_lock);
595
596 /* process the mdn last, since the other dnodes have holds on it */
597 list_remove(&os->os_dnodes, DMU_META_DNODE(os));
598 list_insert_tail(&os->os_dnodes, DMU_META_DNODE(os));
599
600 /*
601 * Find the first dnode with holds. We have to do this dance
602 * because dnode_add_ref() only works if you already have a
603 * hold. If there are no holds then it has no dbufs so OK to
604 * skip.
605 */
606 for (dn = list_head(&os->os_dnodes);
607 dn && !dnode_add_ref(dn, FTAG);
608 dn = list_next(&os->os_dnodes, dn))
609 continue;
610
611 while (dn) {
612 dnode_t *next_dn = dn;
613
614 do {
615 next_dn = list_next(&os->os_dnodes, next_dn);
616 } while (next_dn && !dnode_add_ref(next_dn, FTAG));
617
618 mutex_exit(&os->os_lock);
619 dnode_evict_dbufs(dn);
620 dnode_rele(dn, FTAG);
621 mutex_enter(&os->os_lock);
622 dn = next_dn;
623 }
624 mutex_exit(&os->os_lock);
625 }
626
627 void
628 dmu_objset_evict(objset_t *os)
629 {
630 dsl_dataset_t *ds = os->os_dsl_dataset;
631
632 for (int t = 0; t < TXG_SIZE; t++)
633 ASSERT(!dmu_objset_is_dirty(os, t));
634
635 if (ds) {
636 if (!dsl_dataset_is_snapshot(ds)) {
637 VERIFY0(dsl_prop_unregister(ds,
638 zfs_prop_to_name(ZFS_PROP_CHECKSUM),
639 checksum_changed_cb, os));
640 VERIFY0(dsl_prop_unregister(ds,
641 zfs_prop_to_name(ZFS_PROP_COMPRESSION),
642 compression_changed_cb, os));
643 VERIFY0(dsl_prop_unregister(ds,
644 zfs_prop_to_name(ZFS_PROP_COPIES),
645 copies_changed_cb, os));
646 VERIFY0(dsl_prop_unregister(ds,
647 zfs_prop_to_name(ZFS_PROP_DEDUP),
648 dedup_changed_cb, os));
649 VERIFY0(dsl_prop_unregister(ds,
650 zfs_prop_to_name(ZFS_PROP_LOGBIAS),
651 logbias_changed_cb, os));
652 VERIFY0(dsl_prop_unregister(ds,
653 zfs_prop_to_name(ZFS_PROP_SYNC),
654 sync_changed_cb, os));
655 VERIFY0(dsl_prop_unregister(ds,
656 zfs_prop_to_name(ZFS_PROP_REDUNDANT_METADATA),
657 redundant_metadata_changed_cb, os));
658 VERIFY0(dsl_prop_unregister(ds,
659 zfs_prop_to_name(ZFS_PROP_RECORDSIZE),
660 recordsize_changed_cb, os));
661 }
662 VERIFY0(dsl_prop_unregister(ds,
663 zfs_prop_to_name(ZFS_PROP_PRIMARYCACHE),
664 primary_cache_changed_cb, os));
665 VERIFY0(dsl_prop_unregister(ds,
666 zfs_prop_to_name(ZFS_PROP_SECONDARYCACHE),
667 secondary_cache_changed_cb, os));
668 }
669
670 if (os->os_sa)
671 sa_tear_down(os);
672
673 dmu_objset_evict_dbufs(os);
674
675 dnode_special_close(&os->os_meta_dnode);
676 if (DMU_USERUSED_DNODE(os)) {
677 dnode_special_close(&os->os_userused_dnode);
678 dnode_special_close(&os->os_groupused_dnode);
679 }
680 zil_free(os->os_zil);
681
682 ASSERT3P(list_head(&os->os_dnodes), ==, NULL);
683
684 VERIFY(arc_buf_remove_ref(os->os_phys_buf, &os->os_phys_buf));
685
686 /*
687 * This is a barrier to prevent the objset from going away in
688 * dnode_move() until we can safely ensure that the objset is still in
689 * use. We consider the objset valid before the barrier and invalid
690 * after the barrier.
691 */
692 rw_enter(&os_lock, RW_READER);
693 rw_exit(&os_lock);
694
695 mutex_destroy(&os->os_lock);
696 mutex_destroy(&os->os_obj_lock);
697 mutex_destroy(&os->os_user_ptr_lock);
698 kmem_free(os, sizeof (objset_t));
699 }
700
701 timestruc_t
702 dmu_objset_snap_cmtime(objset_t *os)
703 {
704 return (dsl_dir_snap_cmtime(os->os_dsl_dataset->ds_dir));
705 }
706
707 /* called from dsl for meta-objset */
708 objset_t *
709 dmu_objset_create_impl(spa_t *spa, dsl_dataset_t *ds, blkptr_t *bp,
710 dmu_objset_type_t type, dmu_tx_t *tx)
711 {
712 objset_t *os;
713 dnode_t *mdn;
714
715 ASSERT(dmu_tx_is_syncing(tx));
716
717 if (ds != NULL)
886 }
887 error = dsl_fs_ss_limit_check(pdd, 1, ZFS_PROP_FILESYSTEM_LIMIT, NULL,
888 doca->doca_cred);
889 if (error != 0) {
890 dsl_dir_rele(pdd, FTAG);
891 return (SET_ERROR(EDQUOT));
892 }
893 dsl_dir_rele(pdd, FTAG);
894
895 error = dsl_dataset_hold(dp, doca->doca_origin, FTAG, &origin);
896 if (error != 0)
897 return (error);
898
899 /* You can't clone across pools. */
900 if (origin->ds_dir->dd_pool != dp) {
901 dsl_dataset_rele(origin, FTAG);
902 return (SET_ERROR(EXDEV));
903 }
904
905 /* You can only clone snapshots, not the head datasets. */
906 if (!dsl_dataset_is_snapshot(origin)) {
907 dsl_dataset_rele(origin, FTAG);
908 return (SET_ERROR(EINVAL));
909 }
910 dsl_dataset_rele(origin, FTAG);
911
912 return (0);
913 }
914
915 static void
916 dmu_objset_clone_sync(void *arg, dmu_tx_t *tx)
917 {
918 dmu_objset_clone_arg_t *doca = arg;
919 dsl_pool_t *dp = dmu_tx_pool(tx);
920 dsl_dir_t *pdd;
921 const char *tail;
922 dsl_dataset_t *origin, *ds;
923 uint64_t obj;
924 char namebuf[MAXNAMELEN];
925
926 VERIFY0(dsl_dir_hold(dp, doca->doca_clone, FTAG, &pdd, &tail));
1450
1451 void
1452 dmu_objset_stats(objset_t *os, nvlist_t *nv)
1453 {
1454 ASSERT(os->os_dsl_dataset ||
1455 os->os_phys->os_type == DMU_OST_META);
1456
1457 if (os->os_dsl_dataset != NULL)
1458 dsl_dataset_stats(os->os_dsl_dataset, nv);
1459
1460 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_TYPE,
1461 os->os_phys->os_type);
1462 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERACCOUNTING,
1463 dmu_objset_userspace_present(os));
1464 }
1465
1466 int
1467 dmu_objset_is_snapshot(objset_t *os)
1468 {
1469 if (os->os_dsl_dataset != NULL)
1470 return (dsl_dataset_is_snapshot(os->os_dsl_dataset));
1471 else
1472 return (B_FALSE);
1473 }
1474
1475 int
1476 dmu_snapshot_realname(objset_t *os, char *name, char *real, int maxlen,
1477 boolean_t *conflict)
1478 {
1479 dsl_dataset_t *ds = os->os_dsl_dataset;
1480 uint64_t ignored;
1481
1482 if (dsl_dataset_phys(ds)->ds_snapnames_zapobj == 0)
1483 return (SET_ERROR(ENOENT));
1484
1485 return (zap_lookup_norm(ds->ds_dir->dd_pool->dp_meta_objset,
1486 dsl_dataset_phys(ds)->ds_snapnames_zapobj, name, 8, 1, &ignored,
1487 MT_FIRST, real, maxlen, conflict));
1488 }
1489
1490 int
|
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Copyright (c) 2012, 2014 by Delphix. All rights reserved.
24 * Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
25 * Copyright (c) 2013, Joyent, Inc. All rights reserved.
26 * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
27 */
28
29 /* Portions Copyright 2010 Robert Milkowski */
30
31 #include <sys/cred.h>
32 #include <sys/zfs_context.h>
33 #include <sys/dmu_objset.h>
34 #include <sys/dsl_dir.h>
35 #include <sys/dsl_dataset.h>
36 #include <sys/dsl_prop.h>
37 #include <sys/dsl_pool.h>
38 #include <sys/dsl_synctask.h>
39 #include <sys/dsl_deleg.h>
40 #include <sys/dnode.h>
41 #include <sys/dbuf.h>
42 #include <sys/zvol.h>
43 #include <sys/dmu_tx.h>
44 #include <sys/zap.h>
45 #include <sys/zil.h>
46 #include <sys/dmu_impl.h>
339 &os->os_phys_buf, ARC_BUFC_METADATA);
340 os->os_phys = os->os_phys_buf->b_data;
341 bzero(os->os_phys, size);
342 }
343
344 /*
345 * Note: the changed_cb will be called once before the register
346 * func returns, thus changing the checksum/compression from the
347 * default (fletcher2/off). Snapshots don't need to know about
348 * checksum/compression/copies.
349 */
350 if (ds != NULL) {
351 err = dsl_prop_register(ds,
352 zfs_prop_to_name(ZFS_PROP_PRIMARYCACHE),
353 primary_cache_changed_cb, os);
354 if (err == 0) {
355 err = dsl_prop_register(ds,
356 zfs_prop_to_name(ZFS_PROP_SECONDARYCACHE),
357 secondary_cache_changed_cb, os);
358 }
359 if (!ds->ds_is_snapshot) {
360 if (err == 0) {
361 err = dsl_prop_register(ds,
362 zfs_prop_to_name(ZFS_PROP_CHECKSUM),
363 checksum_changed_cb, os);
364 }
365 if (err == 0) {
366 err = dsl_prop_register(ds,
367 zfs_prop_to_name(ZFS_PROP_COMPRESSION),
368 compression_changed_cb, os);
369 }
370 if (err == 0) {
371 err = dsl_prop_register(ds,
372 zfs_prop_to_name(ZFS_PROP_COPIES),
373 copies_changed_cb, os);
374 }
375 if (err == 0) {
376 err = dsl_prop_register(ds,
377 zfs_prop_to_name(ZFS_PROP_DEDUP),
378 dedup_changed_cb, os);
379 }
401 }
402 if (err != 0) {
403 VERIFY(arc_buf_remove_ref(os->os_phys_buf,
404 &os->os_phys_buf));
405 kmem_free(os, sizeof (objset_t));
406 return (err);
407 }
408 } else {
409 /* It's the meta-objset. */
410 os->os_checksum = ZIO_CHECKSUM_FLETCHER_4;
411 os->os_compress = ZIO_COMPRESS_LZJB;
412 os->os_copies = spa_max_replication(spa);
413 os->os_dedup_checksum = ZIO_CHECKSUM_OFF;
414 os->os_dedup_verify = B_FALSE;
415 os->os_logbias = ZFS_LOGBIAS_LATENCY;
416 os->os_sync = ZFS_SYNC_STANDARD;
417 os->os_primary_cache = ZFS_CACHE_ALL;
418 os->os_secondary_cache = ZFS_CACHE_ALL;
419 }
420
421 if (ds == NULL || !ds->ds_is_snapshot)
422 os->os_zil_header = os->os_phys->os_zil_header;
423 os->os_zil = zil_alloc(os, &os->os_zil_header);
424
425 for (i = 0; i < TXG_SIZE; i++) {
426 list_create(&os->os_dirty_dnodes[i], sizeof (dnode_t),
427 offsetof(dnode_t, dn_dirty_link[i]));
428 list_create(&os->os_free_dnodes[i], sizeof (dnode_t),
429 offsetof(dnode_t, dn_dirty_link[i]));
430 }
431 list_create(&os->os_dnodes, sizeof (dnode_t),
432 offsetof(dnode_t, dn_link));
433 list_create(&os->os_downgraded_dbufs, sizeof (dmu_buf_impl_t),
434 offsetof(dmu_buf_impl_t, db_link));
435
436 mutex_init(&os->os_lock, NULL, MUTEX_DEFAULT, NULL);
437 mutex_init(&os->os_obj_lock, NULL, MUTEX_DEFAULT, NULL);
438 mutex_init(&os->os_user_ptr_lock, NULL, MUTEX_DEFAULT, NULL);
439
440 dnode_special_open(os, &os->os_phys->os_meta_dnode,
441 DMU_META_DNODE_OBJECT, &os->os_meta_dnode);
442 if (arc_buf_size(os->os_phys_buf) >= sizeof (objset_phys_t)) {
443 dnode_special_open(os, &os->os_phys->os_userused_dnode,
444 DMU_USERUSED_OBJECT, &os->os_userused_dnode);
445 dnode_special_open(os, &os->os_phys->os_groupused_dnode,
446 DMU_GROUPUSED_OBJECT, &os->os_groupused_dnode);
447 }
448
449 *osp = os;
450 return (0);
451 }
452
453 int
454 dmu_objset_from_ds(dsl_dataset_t *ds, objset_t **osp)
455 {
456 int err = 0;
457
458 mutex_enter(&ds->ds_opening_lock);
459 if (ds->ds_objset == NULL) {
460 objset_t *os;
461 err = dmu_objset_open_impl(dsl_dataset_get_spa(ds),
462 ds, dsl_dataset_get_blkptr(ds), &os);
463
464 if (err == 0) {
465 mutex_enter(&ds->ds_lock);
466 ASSERT(ds->ds_objset == NULL);
514 dsl_pool_t *dp;
515 dsl_dataset_t *ds;
516 int err;
517
518 err = dsl_pool_hold(name, FTAG, &dp);
519 if (err != 0)
520 return (err);
521 err = dsl_dataset_own(dp, name, tag, &ds);
522 if (err != 0) {
523 dsl_pool_rele(dp, FTAG);
524 return (err);
525 }
526
527 err = dmu_objset_from_ds(ds, osp);
528 dsl_pool_rele(dp, FTAG);
529 if (err != 0) {
530 dsl_dataset_disown(ds, tag);
531 } else if (type != DMU_OST_ANY && type != (*osp)->os_phys->os_type) {
532 dsl_dataset_disown(ds, tag);
533 return (SET_ERROR(EINVAL));
534 } else if (!readonly && ds->ds_is_snapshot) {
535 dsl_dataset_disown(ds, tag);
536 return (SET_ERROR(EROFS));
537 }
538 return (err);
539 }
540
541 void
542 dmu_objset_rele(objset_t *os, void *tag)
543 {
544 dsl_pool_t *dp = dmu_objset_pool(os);
545 dsl_dataset_rele(os->os_dsl_dataset, tag);
546 dsl_pool_rele(dp, tag);
547 }
548
549 /*
550 * When we are called, os MUST refer to an objset associated with a dataset
551 * that is owned by 'tag'; that is, is held and long held by 'tag' and ds_owner
552 * == tag. We will then release and reacquire ownership of the dataset while
553 * holding the pool config_rwlock to avoid intervening namespace or ownership
554 * changes may occur.
570 VERIFY(dsl_dataset_long_held(ds));
571
572 dsl_dataset_name(ds, name);
573 dp = dmu_objset_pool(os);
574 dsl_pool_config_enter(dp, FTAG);
575 dmu_objset_disown(os, tag);
576 VERIFY0(dsl_dataset_own(dp, name, tag, &newds));
577 VERIFY3P(newds, ==, os->os_dsl_dataset);
578 dsl_pool_config_exit(dp, FTAG);
579 }
580
581 void
582 dmu_objset_disown(objset_t *os, void *tag)
583 {
584 dsl_dataset_disown(os->os_dsl_dataset, tag);
585 }
586
587 void
588 dmu_objset_evict_dbufs(objset_t *os)
589 {
590 dnode_t dn_marker;
591 dnode_t *dn;
592
593 mutex_enter(&os->os_lock);
594 dn = list_head(&os->os_dnodes);
595 while (dn != NULL) {
596 /*
597 * Skip dnodes without holds. We have to do this dance
598 * because dnode_add_ref() only works if there is already a
599 * hold. If the dnode has no holds, then it has no dbufs.
600 */
601 if (dnode_add_ref(dn, FTAG)) {
602 list_insert_after(&os->os_dnodes, dn, &dn_marker);
603 mutex_exit(&os->os_lock);
604
605 dnode_evict_dbufs(dn);
606 dnode_rele(dn, FTAG);
607
608 mutex_enter(&os->os_lock);
609 dn = list_next(&os->os_dnodes, &dn_marker);
610 list_remove(&os->os_dnodes, &dn_marker);
611 } else {
612 dn = list_next(&os->os_dnodes, dn);
613 }
614 }
615 mutex_exit(&os->os_lock);
616
617 if (DMU_USERUSED_DNODE(os) != NULL) {
618 dnode_evict_dbufs(DMU_GROUPUSED_DNODE(os));
619 dnode_evict_dbufs(DMU_USERUSED_DNODE(os));
620 }
621 dnode_evict_dbufs(DMU_META_DNODE(os));
622 }
623
624 /*
625 * Objset eviction processing is split into into two pieces.
626 * The first marks the objset as evicting, evicts any dbufs that
627 * have a refcount of zero, and then queues up the objset for the
628 * second phase of eviction. Once os->os_dnodes has been cleared by
629 * dnode_buf_pageout()->dnode_destroy(), the second phase is executed.
630 * The second phase closes the special dnodes, dequeues the objset from
631 * the list of those undergoing eviction, and finally frees the objset.
632 *
633 * NOTE: Due to asynchronous eviction processing (invocation of
634 * dnode_buf_pageout()), it is possible for the meta dnode for the
635 * objset to have no holds even though os->os_dnodes is not empty.
636 */
637 void
638 dmu_objset_evict(objset_t *os)
639 {
640 dsl_dataset_t *ds = os->os_dsl_dataset;
641
642 for (int t = 0; t < TXG_SIZE; t++)
643 ASSERT(!dmu_objset_is_dirty(os, t));
644
645 if (ds) {
646 if (!ds->ds_is_snapshot) {
647 VERIFY0(dsl_prop_unregister(ds,
648 zfs_prop_to_name(ZFS_PROP_CHECKSUM),
649 checksum_changed_cb, os));
650 VERIFY0(dsl_prop_unregister(ds,
651 zfs_prop_to_name(ZFS_PROP_COMPRESSION),
652 compression_changed_cb, os));
653 VERIFY0(dsl_prop_unregister(ds,
654 zfs_prop_to_name(ZFS_PROP_COPIES),
655 copies_changed_cb, os));
656 VERIFY0(dsl_prop_unregister(ds,
657 zfs_prop_to_name(ZFS_PROP_DEDUP),
658 dedup_changed_cb, os));
659 VERIFY0(dsl_prop_unregister(ds,
660 zfs_prop_to_name(ZFS_PROP_LOGBIAS),
661 logbias_changed_cb, os));
662 VERIFY0(dsl_prop_unregister(ds,
663 zfs_prop_to_name(ZFS_PROP_SYNC),
664 sync_changed_cb, os));
665 VERIFY0(dsl_prop_unregister(ds,
666 zfs_prop_to_name(ZFS_PROP_REDUNDANT_METADATA),
667 redundant_metadata_changed_cb, os));
668 VERIFY0(dsl_prop_unregister(ds,
669 zfs_prop_to_name(ZFS_PROP_RECORDSIZE),
670 recordsize_changed_cb, os));
671 }
672 VERIFY0(dsl_prop_unregister(ds,
673 zfs_prop_to_name(ZFS_PROP_PRIMARYCACHE),
674 primary_cache_changed_cb, os));
675 VERIFY0(dsl_prop_unregister(ds,
676 zfs_prop_to_name(ZFS_PROP_SECONDARYCACHE),
677 secondary_cache_changed_cb, os));
678 }
679
680 if (os->os_sa)
681 sa_tear_down(os);
682
683 os->os_evicting = B_TRUE;
684 dmu_objset_evict_dbufs(os);
685
686 mutex_enter(&os->os_lock);
687 spa_evicting_os_register(os->os_spa, os);
688 if (list_is_empty(&os->os_dnodes)) {
689 mutex_exit(&os->os_lock);
690 dmu_objset_evict_done(os);
691 } else {
692 mutex_exit(&os->os_lock);
693 }
694 }
695
696 void
697 dmu_objset_evict_done(objset_t *os)
698 {
699 ASSERT3P(list_head(&os->os_dnodes), ==, NULL);
700
701 dnode_special_close(&os->os_meta_dnode);
702 if (DMU_USERUSED_DNODE(os)) {
703 dnode_special_close(&os->os_userused_dnode);
704 dnode_special_close(&os->os_groupused_dnode);
705 }
706 zil_free(os->os_zil);
707
708 VERIFY(arc_buf_remove_ref(os->os_phys_buf, &os->os_phys_buf));
709
710 /*
711 * This is a barrier to prevent the objset from going away in
712 * dnode_move() until we can safely ensure that the objset is still in
713 * use. We consider the objset valid before the barrier and invalid
714 * after the barrier.
715 */
716 rw_enter(&os_lock, RW_READER);
717 rw_exit(&os_lock);
718
719 mutex_destroy(&os->os_lock);
720 mutex_destroy(&os->os_obj_lock);
721 mutex_destroy(&os->os_user_ptr_lock);
722 spa_evicting_os_deregister(os->os_spa, os);
723 kmem_free(os, sizeof (objset_t));
724 }
725
726 timestruc_t
727 dmu_objset_snap_cmtime(objset_t *os)
728 {
729 return (dsl_dir_snap_cmtime(os->os_dsl_dataset->ds_dir));
730 }
731
732 /* called from dsl for meta-objset */
733 objset_t *
734 dmu_objset_create_impl(spa_t *spa, dsl_dataset_t *ds, blkptr_t *bp,
735 dmu_objset_type_t type, dmu_tx_t *tx)
736 {
737 objset_t *os;
738 dnode_t *mdn;
739
740 ASSERT(dmu_tx_is_syncing(tx));
741
742 if (ds != NULL)
911 }
912 error = dsl_fs_ss_limit_check(pdd, 1, ZFS_PROP_FILESYSTEM_LIMIT, NULL,
913 doca->doca_cred);
914 if (error != 0) {
915 dsl_dir_rele(pdd, FTAG);
916 return (SET_ERROR(EDQUOT));
917 }
918 dsl_dir_rele(pdd, FTAG);
919
920 error = dsl_dataset_hold(dp, doca->doca_origin, FTAG, &origin);
921 if (error != 0)
922 return (error);
923
924 /* You can't clone across pools. */
925 if (origin->ds_dir->dd_pool != dp) {
926 dsl_dataset_rele(origin, FTAG);
927 return (SET_ERROR(EXDEV));
928 }
929
930 /* You can only clone snapshots, not the head datasets. */
931 if (!origin->ds_is_snapshot) {
932 dsl_dataset_rele(origin, FTAG);
933 return (SET_ERROR(EINVAL));
934 }
935 dsl_dataset_rele(origin, FTAG);
936
937 return (0);
938 }
939
940 static void
941 dmu_objset_clone_sync(void *arg, dmu_tx_t *tx)
942 {
943 dmu_objset_clone_arg_t *doca = arg;
944 dsl_pool_t *dp = dmu_tx_pool(tx);
945 dsl_dir_t *pdd;
946 const char *tail;
947 dsl_dataset_t *origin, *ds;
948 uint64_t obj;
949 char namebuf[MAXNAMELEN];
950
951 VERIFY0(dsl_dir_hold(dp, doca->doca_clone, FTAG, &pdd, &tail));
1475
1476 void
1477 dmu_objset_stats(objset_t *os, nvlist_t *nv)
1478 {
1479 ASSERT(os->os_dsl_dataset ||
1480 os->os_phys->os_type == DMU_OST_META);
1481
1482 if (os->os_dsl_dataset != NULL)
1483 dsl_dataset_stats(os->os_dsl_dataset, nv);
1484
1485 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_TYPE,
1486 os->os_phys->os_type);
1487 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERACCOUNTING,
1488 dmu_objset_userspace_present(os));
1489 }
1490
1491 int
1492 dmu_objset_is_snapshot(objset_t *os)
1493 {
1494 if (os->os_dsl_dataset != NULL)
1495 return (os->os_dsl_dataset->ds_is_snapshot);
1496 else
1497 return (B_FALSE);
1498 }
1499
1500 int
1501 dmu_snapshot_realname(objset_t *os, char *name, char *real, int maxlen,
1502 boolean_t *conflict)
1503 {
1504 dsl_dataset_t *ds = os->os_dsl_dataset;
1505 uint64_t ignored;
1506
1507 if (dsl_dataset_phys(ds)->ds_snapnames_zapobj == 0)
1508 return (SET_ERROR(ENOENT));
1509
1510 return (zap_lookup_norm(ds->ds_dir->dd_pool->dp_meta_objset,
1511 dsl_dataset_phys(ds)->ds_snapnames_zapobj, name, 8, 1, &ignored,
1512 MT_FIRST, real, maxlen, conflict));
1513 }
1514
1515 int
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