dsl_dataset.c revision 308083
1492SN/A/* 21929Sihse * CDDL HEADER START 3492SN/A * 4492SN/A * The contents of this file are subject to the terms of the 5492SN/A * Common Development and Distribution License (the "License"). 6492SN/A * You may not use this file except in compliance with the License. 7492SN/A * 8492SN/A * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9492SN/A * or http://www.opensolaris.org/os/licensing. 10492SN/A * See the License for the specific language governing permissions 11492SN/A * and limitations under the License. 12492SN/A * 13492SN/A * When distributing Covered Code, include this CDDL HEADER in each 14492SN/A * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15492SN/A * If applicable, add the following below this CDDL HEADER, with the 16492SN/A * fields enclosed by brackets "[]" replaced with your own identifying 17492SN/A * information: Portions Copyright [yyyy] [name of copyright owner] 18492SN/A * 19492SN/A * CDDL HEADER END 20492SN/A */ 21492SN/A/* 22492SN/A * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 23492SN/A * Portions Copyright (c) 2011 Martin Matuska <mm@FreeBSD.org> 24492SN/A * Copyright (c) 2011, 2015 by Delphix. All rights reserved. 25492SN/A * Copyright (c) 2014, Joyent, Inc. All rights reserved. 261120Schegar * Copyright (c) 2014 RackTop Systems. 271120Schegar * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved. 281120Schegar * Copyright (c) 2014 Integros [integros.com] 291410Sihse * Copyright 2016, OmniTI Computer Consulting, Inc. All rights reserved. 301120Schegar */ 311120Schegar 321120Schegar#include <sys/dmu_objset.h> 33492SN/A#include <sys/dsl_dataset.h> 341410Sihse#include <sys/dsl_dir.h> 351410Sihse#include <sys/dsl_prop.h> 361410Sihse#include <sys/dsl_synctask.h> 371410Sihse#include <sys/dmu_traverse.h> 38492SN/A#include <sys/dmu_impl.h> 39492SN/A#include <sys/dmu_send.h> 40492SN/A#include <sys/dmu_tx.h> 411410Sihse#include <sys/arc.h> 421120Schegar#include <sys/zio.h> 43837SN/A#include <sys/zap.h> 44910Sihse#include <sys/zfeature.h> 451131Serikj#include <sys/unique.h> 46492SN/A#include <sys/zfs_context.h> 471120Schegar#include <sys/zfs_ioctl.h> 481236Sihse#include <sys/spa.h> 491120Schegar#include <sys/zfs_znode.h> 501120Schegar#include <sys/zfs_onexit.h> 511120Schegar#include <sys/zvol.h> 52968Sihse#include <sys/dsl_scan.h> 53968Sihse#include <sys/dsl_deadlist.h> 54492SN/A#include <sys/dsl_destroy.h> 551120Schegar#include <sys/dsl_userhold.h> 561804Serikj#include <sys/dsl_bookmark.h> 571120Schegar#include <sys/dmu_send.h> 581120Schegar#include <sys/zio_checksum.h> 591120Schegar#include <sys/zio_compress.h> 601120Schegar#include <zfs_fletcher.h> 611120Schegar 621120SchegarSYSCTL_DECL(_vfs_zfs); 631120Schegar 641120Schegar/* 651120Schegar * The SPA supports block sizes up to 16MB. However, very large blocks 661120Schegar * can have an impact on i/o latency (e.g. tying up a spinning disk for 671120Schegar * ~300ms), and also potentially on the memory allocator. Therefore, 681223Schegar * we do not allow the recordsize to be set larger than zfs_max_recordsize 691223Schegar * (default 1MB). Larger blocks can be created by changing this tunable, 701223Schegar * and pools with larger blocks can always be imported and used, regardless 711120Schegar * of this setting. 721120Schegar */ 731120Schegarint zfs_max_recordsize = 1 * 1024 * 1024; 741120SchegarSYSCTL_INT(_vfs_zfs, OID_AUTO, max_recordsize, CTLFLAG_RWTUN, 751120Schegar &zfs_max_recordsize, 0, 761120Schegar "Maximum block size. Expect dragons when tuning this."); 771600Snaoto 781600Snaoto#define SWITCH64(x, y) \ 791600Snaoto { \ 801223Schegar uint64_t __tmp = (x); \ 811862Serikj (x) = (y); \ 821120Schegar (y) = __tmp; \ 831659Serikj } 841600Snaoto 851120Schegar#define DS_REF_MAX (1ULL << 62) 861120Schegar 871120Schegarextern inline dsl_dataset_phys_t *dsl_dataset_phys(dsl_dataset_t *ds); 881120Schegar 891120Schegarextern int spa_asize_inflation; 901120Schegar 91492SN/A/* 921120Schegar * Figure out how much of this delta should be propogated to the dsl_dir 931120Schegar * layer. If there's a refreservation, that space has already been 941120Schegar * partially accounted for in our ancestors. 951735Sbobv */ 961735Sbobvstatic int64_t 971735Sbobvparent_delta(dsl_dataset_t *ds, int64_t delta) 981735Sbobv{ 99492SN/A dsl_dataset_phys_t *ds_phys; 1001120Schegar uint64_t old_bytes, new_bytes; 1011120Schegar 1021223Schegar if (ds->ds_reserved == 0) 1031223Schegar return (delta); 1041223Schegar 1051223Schegar ds_phys = dsl_dataset_phys(ds); 1061223Schegar old_bytes = MAX(ds_phys->ds_unique_bytes, ds->ds_reserved); 1071223Schegar new_bytes = MAX(ds_phys->ds_unique_bytes + delta, ds->ds_reserved); 108492SN/A 1091223Schegar ASSERT3U(ABS((int64_t)(new_bytes - old_bytes)), <=, ABS(delta)); 1101223Schegar return (new_bytes - old_bytes); 1111223Schegar} 1121695Stwisti 113557SN/Avoid 1141961Salanbdsl_dataset_block_born(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx) 1151961Salanb{ 1161961Salanb int used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp); 1171961Salanb int compressed = BP_GET_PSIZE(bp); 1181961Salanb int uncompressed = BP_GET_UCSIZE(bp); 1191961Salanb int64_t delta; 1201961Salanb 1211961Salanb dprintf_bp(bp, "ds=%p", ds); 1221961Salanb 1231961Salanb ASSERT(dmu_tx_is_syncing(tx)); 1241961Salanb /* It could have been compressed away to nothing */ 1251961Salanb if (BP_IS_HOLE(bp)) 1261961Salanb return; 1271961Salanb ASSERT(BP_GET_TYPE(bp) != DMU_OT_NONE); 1281961Salanb ASSERT(DMU_OT_IS_VALID(BP_GET_TYPE(bp))); 1291961Salanb if (ds == NULL) { 1301961Salanb dsl_pool_mos_diduse_space(tx->tx_pool, 1311961Salanb used, compressed, uncompressed); 1321120Schegar return; 1331120Schegar } 1341120Schegar 1351120Schegar dmu_buf_will_dirty(ds->ds_dbuf, tx); 1361223Schegar mutex_enter(&ds->ds_lock); 1371223Schegar delta = parent_delta(ds, used); 1381223Schegar dsl_dataset_phys(ds)->ds_referenced_bytes += used; 1391223Schegar dsl_dataset_phys(ds)->ds_compressed_bytes += compressed; 1401223Schegar dsl_dataset_phys(ds)->ds_uncompressed_bytes += uncompressed; 1411223Schegar dsl_dataset_phys(ds)->ds_unique_bytes += used; 1421120Schegar 1431120Schegar if (BP_GET_LSIZE(bp) > SPA_OLD_MAXBLOCKSIZE) { 1441120Schegar ds->ds_feature_activation_needed[SPA_FEATURE_LARGE_BLOCKS] = 1451120Schegar B_TRUE; 1461120Schegar } 1471223Schegar 1481223Schegar spa_feature_t f = zio_checksum_to_feature(BP_GET_CHECKSUM(bp)); 1491223Schegar if (f != SPA_FEATURE_NONE) 1501223Schegar ds->ds_feature_activation_needed[f] = B_TRUE; 1511223Schegar 1521695Stwisti mutex_exit(&ds->ds_lock); 1531695Stwisti dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, delta, 1541120Schegar compressed, uncompressed, tx); 1551961Salanb dsl_dir_transfer_space(ds->ds_dir, used - delta, 1561961Salanb DD_USED_REFRSRV, DD_USED_HEAD, NULL); 1571961Salanb} 1581961Salanb 1591961Salanbint 1601961Salanbdsl_dataset_block_kill(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx, 1611961Salanb boolean_t async) 1621961Salanb{ 1631961Salanb int used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp); 1641961Salanb int compressed = BP_GET_PSIZE(bp); 1651961Salanb int uncompressed = BP_GET_UCSIZE(bp); 1661961Salanb 1671961Salanb if (BP_IS_HOLE(bp)) 1681961Salanb return (0); 1691961Salanb 1701961Salanb ASSERT(dmu_tx_is_syncing(tx)); 1711961Salanb ASSERT(bp->blk_birth <= tx->tx_txg); 172607SN/A 1731120Schegar if (ds == NULL) { 1741120Schegar dsl_free(tx->tx_pool, tx->tx_txg, bp); 1751961Salanb dsl_pool_mos_diduse_space(tx->tx_pool, 1761120Schegar -used, -compressed, -uncompressed); 177492SN/A return (used); 1781120Schegar } 1791120Schegar ASSERT3P(tx->tx_pool, ==, ds->ds_dir->dd_pool); 1801790Serikj 1811790Serikj ASSERT(!ds->ds_is_snapshot); 1821120Schegar dmu_buf_will_dirty(ds->ds_dbuf, tx); 1831120Schegar 1841120Schegar if (bp->blk_birth > dsl_dataset_phys(ds)->ds_prev_snap_txg) { 1851120Schegar int64_t delta; 1861120Schegar 1871120Schegar dprintf_bp(bp, "freeing ds=%llu", ds->ds_object); 1881120Schegar dsl_free(tx->tx_pool, tx->tx_txg, bp); 1891120Schegar 1901790Serikj mutex_enter(&ds->ds_lock); 1911790Serikj ASSERT(dsl_dataset_phys(ds)->ds_unique_bytes >= used || 192492SN/A !DS_UNIQUE_IS_ACCURATE(ds)); 1931120Schegar delta = parent_delta(ds, -used); 1941120Schegar dsl_dataset_phys(ds)->ds_unique_bytes -= used; 1951120Schegar mutex_exit(&ds->ds_lock); 1961120Schegar dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, 1971223Schegar delta, -compressed, -uncompressed, tx); 1981223Schegar dsl_dir_transfer_space(ds->ds_dir, -used - delta, 1991223Schegar DD_USED_REFRSRV, DD_USED_HEAD, NULL); 2001223Schegar } else { 2011223Schegar dprintf_bp(bp, "putting on dead list: %s", ""); 2021120Schegar if (async) { 2031120Schegar /* 2041120Schegar * We are here as part of zio's write done callback, 2051120Schegar * which means we're a zio interrupt thread. We can't 2061120Schegar * call dsl_deadlist_insert() now because it may block 2071223Schegar * waiting for I/O. Instead, put bp on the deferred 2081223Schegar * queue and let dsl_pool_sync() finish the job. 2091223Schegar */ 2101223Schegar bplist_append(&ds->ds_pending_deadlist, bp); 2111223Schegar } else { 2121223Schegar dsl_deadlist_insert(&ds->ds_deadlist, bp, tx); 213492SN/A } 2141223Schegar ASSERT3U(ds->ds_prev->ds_object, ==, 215492SN/A dsl_dataset_phys(ds)->ds_prev_snap_obj); 2161120Schegar ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_num_children > 0); 2171120Schegar /* if (bp->blk_birth > prev prev snap txg) prev unique += bs */ 2181223Schegar if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 2191223Schegar ds->ds_object && bp->blk_birth > 2201223Schegar dsl_dataset_phys(ds->ds_prev)->ds_prev_snap_txg) { 2211223Schegar dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 2221223Schegar mutex_enter(&ds->ds_prev->ds_lock); 2231223Schegar dsl_dataset_phys(ds->ds_prev)->ds_unique_bytes += used; 2241120Schegar mutex_exit(&ds->ds_prev->ds_lock); 2251120Schegar } 2261120Schegar if (bp->blk_birth > ds->ds_dir->dd_origin_txg) { 2271120Schegar dsl_dir_transfer_space(ds->ds_dir, used, 2281120Schegar DD_USED_HEAD, DD_USED_SNAP, tx); 229492SN/A } 230504SN/A } 2312072Serikj mutex_enter(&ds->ds_lock); 2322072Serikj ASSERT3U(dsl_dataset_phys(ds)->ds_referenced_bytes, >=, used); 233504SN/A dsl_dataset_phys(ds)->ds_referenced_bytes -= used; 234492SN/A ASSERT3U(dsl_dataset_phys(ds)->ds_compressed_bytes, >=, compressed); 2352024Serikj dsl_dataset_phys(ds)->ds_compressed_bytes -= compressed; 2362072Serikj ASSERT3U(dsl_dataset_phys(ds)->ds_uncompressed_bytes, >=, uncompressed); 2372024Serikj dsl_dataset_phys(ds)->ds_uncompressed_bytes -= uncompressed; 2382024Serikj mutex_exit(&ds->ds_lock); 239643SN/A 2401120Schegar return (used); 2411120Schegar} 242492SN/A 2431550Serikjuint64_t 2441120Schegardsl_dataset_prev_snap_txg(dsl_dataset_t *ds) 245492SN/A{ 2461550Serikj uint64_t trysnap = 0; 2471120Schegar 248492SN/A if (ds == NULL) 2491550Serikj return (0); 250492SN/A /* 2511120Schegar * The snapshot creation could fail, but that would cause an 2521961Salanb * incorrect FALSE return, which would only result in an 2531961Salanb * overestimation of the amount of space that an operation would 2541961Salanb * consume, which is OK. 2551961Salanb * 2561961Salanb * There's also a small window where we could miss a pending 2571961Salanb * snapshot, because we could set the sync task in the quiescing 2581961Salanb * phase. So this should only be used as a guess. 2591961Salanb */ 2601961Salanb if (ds->ds_trysnap_txg > 2611961Salanb spa_last_synced_txg(ds->ds_dir->dd_pool->dp_spa)) 2621961Salanb trysnap = ds->ds_trysnap_txg; 2631961Salanb return (MAX(dsl_dataset_phys(ds)->ds_prev_snap_txg, trysnap)); 2641961Salanb} 2651961Salanb 2661961Salanbboolean_t 2671961Salanbdsl_dataset_block_freeable(dsl_dataset_t *ds, const blkptr_t *bp, 2681961Salanb uint64_t blk_birth) 2691961Salanb{ 2701961Salanb if (blk_birth <= dsl_dataset_prev_snap_txg(ds) || 2711961Salanb (bp != NULL && BP_IS_HOLE(bp))) 2721961Salanb return (B_FALSE); 2731961Salanb 2741961Salanb ddt_prefetch(dsl_dataset_get_spa(ds), bp); 2751961Salanb 2761961Salanb return (B_TRUE); 2771961Salanb} 2781961Salanb 2791961Salanbstatic void 2801961Salanbdsl_dataset_evict(void *dbu) 2811961Salanb{ 2821961Salanb dsl_dataset_t *ds = dbu; 2831961Salanb 2841961Salanb ASSERT(ds->ds_owner == NULL); 2851961Salanb 2861961Salanb ds->ds_dbuf = NULL; 2871961Salanb 2881961Salanb unique_remove(ds->ds_fsid_guid); 2891961Salanb 2901961Salanb if (ds->ds_objset != NULL) 2911961Salanb dmu_objset_evict(ds->ds_objset); 2921961Salanb 2931961Salanb if (ds->ds_prev) { 294492SN/A dsl_dataset_rele(ds->ds_prev, ds); 295492SN/A ds->ds_prev = NULL; 296492SN/A } 2971223Schegar 2981223Schegar bplist_destroy(&ds->ds_pending_deadlist); 2991862Serikj if (ds->ds_deadlist.dl_os != NULL) 300492SN/A dsl_deadlist_close(&ds->ds_deadlist); 301745SN/A if (ds->ds_dir) 302492SN/A dsl_dir_async_rele(ds->ds_dir, ds); 3031317Sihse 3041120Schegar ASSERT(!list_link_active(&ds->ds_synced_link)); 3052092Serikj 3062092Serikj list_destroy(&ds->ds_prop_cbs); 3072092Serikj if (mutex_owned(&ds->ds_lock)) 3082092Serikj mutex_exit(&ds->ds_lock); 3092092Serikj mutex_destroy(&ds->ds_lock); 3102092Serikj if (mutex_owned(&ds->ds_opening_lock)) 3112092Serikj mutex_exit(&ds->ds_opening_lock); 3121223Schegar mutex_destroy(&ds->ds_opening_lock); 3131223Schegar mutex_destroy(&ds->ds_sendstream_lock); 3141223Schegar refcount_destroy(&ds->ds_longholds); 3151223Schegar rrw_destroy(&ds->ds_bp_rwlock); 3161223Schegar 3171223Schegar kmem_free(ds, sizeof (dsl_dataset_t)); 3181223Schegar} 3191223Schegar 3201223Schegarint 3211223Schegardsl_dataset_get_snapname(dsl_dataset_t *ds) 3221223Schegar{ 3231223Schegar dsl_dataset_phys_t *headphys; 3241223Schegar int err; 3251223Schegar dmu_buf_t *headdbuf; 3261223Schegar dsl_pool_t *dp = ds->ds_dir->dd_pool; 3271223Schegar objset_t *mos = dp->dp_meta_objset; 3281550Serikj 3291223Schegar if (ds->ds_snapname[0]) 3301223Schegar return (0); 3311961Salanb if (dsl_dataset_phys(ds)->ds_next_snap_obj == 0) 3321550Serikj return (0); 3331120Schegar 3341120Schegar err = dmu_bonus_hold(mos, dsl_dir_phys(ds->ds_dir)->dd_head_dataset_obj, 3351120Schegar FTAG, &headdbuf); 3361120Schegar if (err != 0) 3371120Schegar return (err); 3381120Schegar headphys = headdbuf->db_data; 3391120Schegar err = zap_value_search(dp->dp_meta_objset, 3401120Schegar headphys->ds_snapnames_zapobj, ds->ds_object, 0, ds->ds_snapname); 3411120Schegar dmu_buf_rele(headdbuf, FTAG); 3421120Schegar return (err); 3432034Serikj} 3442016Sneugens 3452016Sneugensint 3462034Serikjdsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name, uint64_t *value) 3471120Schegar{ 3481120Schegar objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 3491961Salanb uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj; 3501961Salanb matchtype_t mt; 3512052Sredestad int err; 3521961Salanb 3532052Sredestad if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET) 3542052Sredestad mt = MT_FIRST; 3551961Salanb else 3561961Salanb mt = MT_EXACT; 3571961Salanb 3581961Salanb err = zap_lookup_norm(mos, snapobj, name, 8, 1, 3591961Salanb value, mt, NULL, 0, NULL); 3602052Sredestad if (err == ENOTSUP && mt == MT_FIRST) 3611961Salanb err = zap_lookup(mos, snapobj, name, 8, 1, value); 3621961Salanb return (err); 3631961Salanb} 3641961Salanb 3651961Salanbint 3661961Salanbdsl_dataset_snap_remove(dsl_dataset_t *ds, const char *name, dmu_tx_t *tx, 3672052Sredestad boolean_t adj_cnt) 3682052Sredestad{ 3692052Sredestad objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 3702052Sredestad uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj; 3712052Sredestad matchtype_t mt; 3722052Sredestad int err; 3732052Sredestad 3742052Sredestad dsl_dir_snap_cmtime_update(ds->ds_dir); 3752052Sredestad 3762096Serikj if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET) 3772096Serikj mt = MT_FIRST; 3782052Sredestad else 3792096Serikj mt = MT_EXACT; 3802052Sredestad 3812052Sredestad err = zap_remove_norm(mos, snapobj, name, mt, tx); 3821961Salanb if (err == ENOTSUP && mt == MT_FIRST) 3831961Salanb err = zap_remove(mos, snapobj, name, tx); 3841345Sihse 3851345Sihse if (err == 0 && adj_cnt) 3861345Sihse dsl_fs_ss_count_adjust(ds->ds_dir, -1, 3871345Sihse DD_FIELD_SNAPSHOT_COUNT, tx); 3881345Sihse 3891345Sihse return (err); 3901345Sihse} 3911345Sihse 3921345Sihseboolean_t 3931345Sihsedsl_dataset_try_add_ref(dsl_pool_t *dp, dsl_dataset_t *ds, void *tag) 3941345Sihse{ 3951345Sihse dmu_buf_t *dbuf = ds->ds_dbuf; 3961345Sihse boolean_t result = B_FALSE; 3971345Sihse 3981120Schegar if (dbuf != NULL && dmu_buf_try_add_ref(dbuf, dp->dp_meta_objset, 3991345Sihse ds->ds_object, DMU_BONUS_BLKID, tag)) { 4001345Sihse 4011345Sihse if (ds == dmu_buf_get_user(dbuf)) 4021345Sihse result = B_TRUE; 4031345Sihse else 4041345Sihse dmu_buf_rele(dbuf, tag); 4051345Sihse } 4061345Sihse 4072079Siignatyev return (result); 4082079Siignatyev} 4092079Siignatyev 4102079Siignatyevint 4112079Siignatyevdsl_dataset_hold_obj(dsl_pool_t *dp, uint64_t dsobj, void *tag, 4121641Sihse dsl_dataset_t **dsp) 4131641Sihse{ 4141641Sihse objset_t *mos = dp->dp_meta_objset; 4152017Serikj dmu_buf_t *dbuf; 4162017Serikj dsl_dataset_t *ds; 4172017Serikj int err; 4182013Serikj dmu_object_info_t doi; 4192013Serikj 4202013Serikj ASSERT(dsl_pool_config_held(dp)); 4212017Serikj 4222017Serikj err = dmu_bonus_hold(mos, dsobj, tag, &dbuf); 4232013Serikj if (err != 0) 4242013Serikj return (err); 4252013Serikj 4262017Serikj /* Make sure dsobj has the correct object type. */ 4272017Serikj dmu_object_info_from_db(dbuf, &doi); 4282013Serikj if (doi.doi_bonus_type != DMU_OT_DSL_DATASET) { 4292013Serikj dmu_buf_rele(dbuf, tag); 4302017Serikj return (SET_ERROR(EINVAL)); 4312013Serikj } 4321345Sihse 4331345Sihse ds = dmu_buf_get_user(dbuf); 4342013Serikj if (ds == NULL) { 4352079Siignatyev dsl_dataset_t *winner = NULL; 4361345Sihse 4371345Sihse ds = kmem_zalloc(sizeof (dsl_dataset_t), KM_SLEEP); 4381345Sihse ds->ds_dbuf = dbuf; 4391345Sihse ds->ds_object = dsobj; 4401345Sihse ds->ds_is_snapshot = dsl_dataset_phys(ds)->ds_num_children != 0; 4411120Schegar 4422086Sehelin mutex_init(&ds->ds_lock, NULL, MUTEX_DEFAULT, NULL); 4431345Sihse mutex_init(&ds->ds_opening_lock, NULL, MUTEX_DEFAULT, NULL); 4441739Sehelin mutex_init(&ds->ds_sendstream_lock, NULL, MUTEX_DEFAULT, NULL); 4452086Sehelin rrw_init(&ds->ds_bp_rwlock, B_FALSE); 4461739Sehelin refcount_create(&ds->ds_longholds); 4471345Sihse 4482086Sehelin bplist_create(&ds->ds_pending_deadlist); 4491345Sihse dsl_deadlist_open(&ds->ds_deadlist, 4501738Sehelin mos, dsl_dataset_phys(ds)->ds_deadlist_obj); 4512086Sehelin 4522086Sehelin list_create(&ds->ds_sendstreams, sizeof (dmu_sendarg_t), 4532086Sehelin offsetof(dmu_sendarg_t, dsa_link)); 4542086Sehelin 4551738Sehelin list_create(&ds->ds_prop_cbs, sizeof (dsl_prop_cb_record_t), 4561345Sihse offsetof(dsl_prop_cb_record_t, cbr_ds_node)); 4572086Sehelin 4581120Schegar if (doi.doi_type == DMU_OTN_ZAP_METADATA) { 4591120Schegar for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 4601120Schegar if (!(spa_feature_table[f].fi_flags & 4611120Schegar ZFEATURE_FLAG_PER_DATASET)) 4621739Sehelin continue; 4632086Sehelin err = zap_contains(mos, dsobj, 4641120Schegar spa_feature_table[f].fi_guid); 4651120Schegar if (err == 0) { 4662084Serikj ds->ds_feature_inuse[f] = B_TRUE; 4672084Serikj } else { 4682084Serikj ASSERT3U(err, ==, ENOENT); 4692084Serikj err = 0; 4702084Serikj } 4712084Serikj } 4722084Serikj } 4732084Serikj 4742084Serikj err = dsl_dir_hold_obj(dp, 4752084Serikj dsl_dataset_phys(ds)->ds_dir_obj, NULL, ds, &ds->ds_dir); 4762084Serikj if (err != 0) { 4772084Serikj mutex_destroy(&ds->ds_lock); 4782084Serikj mutex_destroy(&ds->ds_opening_lock); 4792084Serikj mutex_destroy(&ds->ds_sendstream_lock); 4801120Schegar refcount_destroy(&ds->ds_longholds); 4811120Schegar bplist_destroy(&ds->ds_pending_deadlist); 4821120Schegar dsl_deadlist_close(&ds->ds_deadlist); 4831120Schegar kmem_free(ds, sizeof (dsl_dataset_t)); 4841120Schegar dmu_buf_rele(dbuf, tag); 4851120Schegar return (err); 4861120Schegar } 4871120Schegar 4881120Schegar if (!ds->ds_is_snapshot) { 4891236Sihse ds->ds_snapname[0] = '\0'; 4901120Schegar if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { 4911236Sihse err = dsl_dataset_hold_obj(dp, 4921120Schegar dsl_dataset_phys(ds)->ds_prev_snap_obj, 4931120Schegar ds, &ds->ds_prev); 4941120Schegar } 4951120Schegar if (doi.doi_type == DMU_OTN_ZAP_METADATA) { 4961120Schegar int zaperr = zap_lookup(mos, ds->ds_object, 4971120Schegar DS_FIELD_BOOKMARK_NAMES, 4981120Schegar sizeof (ds->ds_bookmarks), 1, 4991236Sihse &ds->ds_bookmarks); 5001236Sihse if (zaperr != ENOENT) 5011120Schegar VERIFY0(zaperr); 5021236Sihse } 5031120Schegar } else { 5041120Schegar if (zfs_flags & ZFS_DEBUG_SNAPNAMES) 5051120Schegar err = dsl_dataset_get_snapname(ds); 5061223Schegar if (err == 0 && 5071223Schegar dsl_dataset_phys(ds)->ds_userrefs_obj != 0) { 5081120Schegar err = zap_count( 5091120Schegar ds->ds_dir->dd_pool->dp_meta_objset, 5101600Snaoto dsl_dataset_phys(ds)->ds_userrefs_obj, 5111120Schegar &ds->ds_userrefs); 5121120Schegar } 5131120Schegar } 5141695Stwisti 5151695Stwisti if (err == 0 && !ds->ds_is_snapshot) { 5161223Schegar err = dsl_prop_get_int_ds(ds, 5171120Schegar zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 5181961Salanb &ds->ds_reserved); 5191961Salanb if (err == 0) { 5201223Schegar err = dsl_prop_get_int_ds(ds, 5211120Schegar zfs_prop_to_name(ZFS_PROP_REFQUOTA), 5221120Schegar &ds->ds_quota); 5231120Schegar } 5241659Serikj } else { 5251120Schegar ds->ds_reserved = ds->ds_quota = 0; 5261550Serikj } 5271550Serikj 5282024Serikj dmu_buf_init_user(&ds->ds_dbu, dsl_dataset_evict, &ds->ds_dbuf); 5292024Serikj if (err == 0) 5301120Schegar winner = dmu_buf_set_user_ie(dbuf, &ds->ds_dbu); 5311120Schegar 5321735Sbobv if (err != 0 || winner != NULL) { 5331735Sbobv bplist_destroy(&ds->ds_pending_deadlist); 5341223Schegar dsl_deadlist_close(&ds->ds_deadlist); 5351120Schegar if (ds->ds_prev) 5361120Schegar dsl_dataset_rele(ds->ds_prev, ds); 5371120Schegar dsl_dir_rele(ds->ds_dir, ds); 5381735Sbobv mutex_destroy(&ds->ds_lock); 5391735Sbobv mutex_destroy(&ds->ds_opening_lock); 5401735Sbobv mutex_destroy(&ds->ds_sendstream_lock); 5411735Sbobv refcount_destroy(&ds->ds_longholds); 5421130Serikj kmem_free(ds, sizeof (dsl_dataset_t)); 5431130Serikj if (err != 0) { 5441130Serikj dmu_buf_rele(dbuf, tag); 5451550Serikj return (err); 5461120Schegar } 5471120Schegar ds = winner; 5481120Schegar } else { 5491120Schegar ds->ds_fsid_guid = 5501120Schegar unique_insert(dsl_dataset_phys(ds)->ds_fsid_guid); 5511120Schegar } 5521120Schegar } 5531120Schegar ASSERT3P(ds->ds_dbuf, ==, dbuf); 5541120Schegar ASSERT3P(dsl_dataset_phys(ds), ==, dbuf->db_data); 5551120Schegar ASSERT(dsl_dataset_phys(ds)->ds_prev_snap_obj != 0 || 5561120Schegar spa_version(dp->dp_spa) < SPA_VERSION_ORIGIN || 5571120Schegar dp->dp_origin_snap == NULL || ds == dp->dp_origin_snap); 5581120Schegar *dsp = ds; 5592052Sredestad return (0); 5602052Sredestad} 5612052Sredestad 5621961Salanbint 5632052Sredestaddsl_dataset_hold(dsl_pool_t *dp, const char *name, 5641961Salanb void *tag, dsl_dataset_t **dsp) 5651120Schegar{ 5661120Schegar dsl_dir_t *dd; 5671223Schegar const char *snapname; 5681120Schegar uint64_t obj; 5691120Schegar int err = 0; 5701433Sptbrunet dsl_dataset_t *ds; 5711433Sptbrunet 5721433Sptbrunet err = dsl_dir_hold(dp, name, FTAG, &dd, &snapname); 5731236Sihse if (err != 0) 5741223Schegar return (err); 5751223Schegar 5761223Schegar ASSERT(dsl_pool_config_held(dp)); 5771223Schegar obj = dsl_dir_phys(dd)->dd_head_dataset_obj; 5781178Serikj if (obj != 0) 5791178Serikj err = dsl_dataset_hold_obj(dp, obj, tag, &ds); 5801223Schegar else 5811178Serikj err = SET_ERROR(ENOENT); 5821882Samurillo 5831882Samurillo /* we may be looking for a snapshot */ 5841929Sihse if (err == 0 && snapname != NULL) { 5851882Samurillo dsl_dataset_t *snap_ds; 5861120Schegar 5871120Schegar if (*snapname++ != '@') { 5881120Schegar dsl_dataset_rele(ds, tag); 5891695Stwisti dsl_dir_rele(dd, FTAG); 5901695Stwisti return (SET_ERROR(ENOENT)); 5911695Stwisti } 5921515Smchung 5931147Smchung dprintf("looking for snapshot '%s'\n", snapname); 5941961Salanb err = dsl_dataset_snap_lookup(ds, snapname, &obj); 5951961Salanb if (err == 0) 5961961Salanb err = dsl_dataset_hold_obj(dp, obj, tag, &snap_ds); 5971961Salanb dsl_dataset_rele(ds, tag); 5981961Salanb 5991961Salanb if (err == 0) { 6002046Salanb mutex_enter(&snap_ds->ds_lock); 6012046Salanb if (snap_ds->ds_snapname[0] == 0) 6022052Sredestad (void) strlcpy(snap_ds->ds_snapname, snapname, 6032052Sredestad sizeof (snap_ds->ds_snapname)); 6042052Sredestad mutex_exit(&snap_ds->ds_lock); 6052087Serikj ds = snap_ds; 6062087Serikj } 6072052Sredestad } 6081961Salanb if (err == 0) 6091961Salanb *dsp = ds; 6101961Salanb dsl_dir_rele(dd, FTAG); 6112052Sredestad return (err); 6122052Sredestad} 6132052Sredestad 6142052Sredestadint 6152052Sredestaddsl_dataset_own_obj(dsl_pool_t *dp, uint64_t dsobj, 6161961Salanb void *tag, dsl_dataset_t **dsp) 6171961Salanb{ 6181961Salanb int err = dsl_dataset_hold_obj(dp, dsobj, tag, dsp); 6191961Salanb if (err != 0) 6201961Salanb return (err); 6211961Salanb if (!dsl_dataset_tryown(*dsp, tag)) { 6221961Salanb dsl_dataset_rele(*dsp, tag); 6231961Salanb *dsp = NULL; 6242052Sredestad return (SET_ERROR(EBUSY)); 6252052Sredestad } 6262052Sredestad return (0); 6272052Sredestad} 6282052Sredestad 6292052Sredestadint 6301961Salanbdsl_dataset_own(dsl_pool_t *dp, const char *name, 6311961Salanb void *tag, dsl_dataset_t **dsp) 6322052Sredestad{ 6332052Sredestad int err = dsl_dataset_hold(dp, name, tag, dsp); 6342052Sredestad if (err != 0) 6352052Sredestad return (err); 6361961Salanb if (!dsl_dataset_tryown(*dsp, tag)) { 6371961Salanb dsl_dataset_rele(*dsp, tag); 6381223Schegar return (SET_ERROR(EBUSY)); 6391223Schegar } 6401120Schegar return (0); 6411223Schegar} 6421223Schegar 6431961Salanb/* 6441120Schegar * See the comment above dsl_pool_hold() for details. In summary, a long 6452096Serikj * hold is used to prevent destruction of a dataset while the pool hold 6462096Serikj * is dropped, allowing other concurrent operations (e.g. spa_sync()). 6472096Serikj * 6482096Serikj * The dataset and pool must be held when this function is called. After it 6492096Serikj * is called, the pool hold may be released while the dataset is still held 6502096Serikj * and accessed. 6512096Serikj */ 6522096Serikjvoid 6532096Serikjdsl_dataset_long_hold(dsl_dataset_t *ds, void *tag) 6542096Serikj{ 6552096Serikj ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 6562096Serikj (void) refcount_add(&ds->ds_longholds, tag); 6572096Serikj} 6582052Sredestad 6592052Sredestadvoid 6602096Serikjdsl_dataset_long_rele(dsl_dataset_t *ds, void *tag) 6611120Schegar{ 6621961Salanb (void) refcount_remove(&ds->ds_longholds, tag); 6631120Schegar} 6641550Serikj 6651120Schegar/* Return B_TRUE if there are any long holds on this dataset. */ 6661223Schegarboolean_t 6671120Schegardsl_dataset_long_held(dsl_dataset_t *ds) 6681961Salanb{ 6691120Schegar return (!refcount_is_zero(&ds->ds_longholds)); 6701120Schegar} 6711120Schegar 6722034Serikjvoid 6732034Serikjdsl_dataset_name(dsl_dataset_t *ds, char *name) 6741345Sihse{ 6751120Schegar if (ds == NULL) { 6762052Sredestad (void) strcpy(name, "mos"); 6772052Sredestad } else { 6781961Salanb dsl_dir_name(ds->ds_dir, name); 6792052Sredestad VERIFY0(dsl_dataset_get_snapname(ds)); 6802052Sredestad if (ds->ds_snapname[0]) { 6812052Sredestad VERIFY3U(strlcat(name, "@", ZFS_MAX_DATASET_NAME_LEN), 6821120Schegar <, ZFS_MAX_DATASET_NAME_LEN); 6831299Serikj /* 6841299Serikj * We use a "recursive" mutex so that we 6851724Serikj * can call dprintf_ds() with ds_lock held. 6861724Serikj */ 6872013Serikj if (!MUTEX_HELD(&ds->ds_lock)) { 6882013Serikj mutex_enter(&ds->ds_lock); 6892013Serikj VERIFY3U(strlcat(name, ds->ds_snapname, 6902013Serikj ZFS_MAX_DATASET_NAME_LEN), <, 6912013Serikj ZFS_MAX_DATASET_NAME_LEN); 6922013Serikj mutex_exit(&ds->ds_lock); 6931348Serikj } else { 6941348Serikj VERIFY3U(strlcat(name, ds->ds_snapname, 6951348Serikj ZFS_MAX_DATASET_NAME_LEN), <, 6961348Serikj ZFS_MAX_DATASET_NAME_LEN); 6971345Sihse } 6981345Sihse } 6991345Sihse } 7001345Sihse} 7012079Siignatyev 7022079Siignatyevint 7031738Sehelindsl_dataset_namelen(dsl_dataset_t *ds) 7041738Sehelin{ 7051739Sehelin VERIFY0(dsl_dataset_get_snapname(ds)); 7061739Sehelin mutex_enter(&ds->ds_lock); 7072086Sehelin int len = dsl_dir_namelen(ds->ds_dir) + 1 + strlen(ds->ds_snapname); 7082086Sehelin mutex_exit(&ds->ds_lock); 7091750Serikj return (len); 7101750Serikj} 7112084Serikj 7122084Serikjvoid 7132084Serikjdsl_dataset_rele(dsl_dataset_t *ds, void *tag) 7142084Serikj{ 7152084Serikj dmu_buf_rele(ds->ds_dbuf, tag); 7162084Serikj} 7171961Salanb 7181961Salanbvoid 7191120Schegardsl_dataset_disown(dsl_dataset_t *ds, void *tag) 7201120Schegar{ 7211120Schegar ASSERT3P(ds->ds_owner, ==, tag); 7221120Schegar ASSERT(ds->ds_dbuf != NULL); 7231120Schegar 7241659Serikj mutex_enter(&ds->ds_lock); 7251223Schegar ds->ds_owner = NULL; 7261223Schegar mutex_exit(&ds->ds_lock); 7271120Schegar dsl_dataset_long_rele(ds, tag); 7281120Schegar dsl_dataset_rele(ds, tag); 7291120Schegar} 7301120Schegar 7311961Salanbboolean_t 7321120Schegardsl_dataset_tryown(dsl_dataset_t *ds, void *tag) 7331120Schegar{ 7341120Schegar boolean_t gotit = FALSE; 7351120Schegar 7361120Schegar ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 7371223Schegar mutex_enter(&ds->ds_lock); 7381120Schegar if (ds->ds_owner == NULL && !DS_IS_INCONSISTENT(ds)) { 7391120Schegar ds->ds_owner = tag; 7401120Schegar dsl_dataset_long_hold(ds, tag); 7411961Salanb gotit = TRUE; 7421961Salanb } 7431961Salanb mutex_exit(&ds->ds_lock); 7441961Salanb return (gotit); 7451223Schegar} 7461223Schegar 7471223Schegarboolean_t 7481120Schegardsl_dataset_has_owner(dsl_dataset_t *ds) 7491120Schegar{ 7501790Serikj boolean_t rv; 7511120Schegar mutex_enter(&ds->ds_lock); 7521120Schegar rv = (ds->ds_owner != NULL); 7531120Schegar mutex_exit(&ds->ds_lock); 7541120Schegar return (rv); 7551223Schegar} 7561120Schegar 7571961Salanbstatic void 7581550Serikjdsl_dataset_activate_feature(uint64_t dsobj, spa_feature_t f, dmu_tx_t *tx) 7591550Serikj{ 7601550Serikj spa_t *spa = dmu_tx_pool(tx)->dp_spa; 7611550Serikj objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset; 7621317Sihse uint64_t zero = 0; 7631790Serikj 7641317Sihse VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET); 7652052Sredestad 7661961Salanb spa_feature_incr(spa, f, tx); 7671550Serikj dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx); 7681550Serikj 7691345Sihse VERIFY0(zap_add(mos, dsobj, spa_feature_table[f].fi_guid, 7701317Sihse sizeof (zero), 1, &zero, tx)); 7711120Schegar} 7721317Sihse 7731317Sihsevoid 7741961Salanbdsl_dataset_deactivate_feature(uint64_t dsobj, spa_feature_t f, dmu_tx_t *tx) 7751961Salanb{ 7762052Sredestad spa_t *spa = dmu_tx_pool(tx)->dp_spa; 7772052Sredestad objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset; 7782052Sredestad 7792052Sredestad VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET); 7801961Salanb 7812052Sredestad VERIFY0(zap_remove(mos, dsobj, spa_feature_table[f].fi_guid, tx)); 7822052Sredestad spa_feature_decr(spa, f, tx); 7832052Sredestad} 7841961Salanb 7851120Schegaruint64_t 7861223Schegardsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin, 7871317Sihse uint64_t flags, dmu_tx_t *tx) 7881223Schegar{ 7891120Schegar dsl_pool_t *dp = dd->dd_pool; 7901317Sihse dmu_buf_t *dbuf; 7912034Serikj dsl_dataset_phys_t *dsphys; 7921120Schegar uint64_t dsobj; 7931317Sihse objset_t *mos = dp->dp_meta_objset; 7941345Sihse 7952079Siignatyev if (origin == NULL) 7961275Sihse origin = dp->dp_origin_snap; 7972084Serikj 7981317Sihse ASSERT(origin == NULL || origin->ds_dir->dd_pool == dp); 7991317Sihse ASSERT(origin == NULL || dsl_dataset_phys(origin)->ds_num_children > 0); 8002084Serikj ASSERT(dmu_tx_is_syncing(tx)); 8012084Serikj ASSERT(dsl_dir_phys(dd)->dd_head_dataset_obj == 0); 8022084Serikj 8031961Salanb dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 8041790Serikj DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 8052084Serikj VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 8062084Serikj dmu_buf_will_dirty(dbuf, tx); 8071120Schegar dsphys = dbuf->db_data; 8081120Schegar bzero(dsphys, sizeof (dsl_dataset_phys_t)); 8091120Schegar dsphys->ds_dir_obj = dd->dd_object; 8101317Sihse dsphys->ds_flags = flags; 8111317Sihse dsphys->ds_fsid_guid = unique_create(); 8121317Sihse do { 8131817Serikj (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 8141317Sihse sizeof (dsphys->ds_guid)); 8151317Sihse } while (dsphys->ds_guid == 0); 8161317Sihse dsphys->ds_snapnames_zapobj = 8172084Serikj zap_create_norm(mos, U8_TEXTPREP_TOUPPER, DMU_OT_DSL_DS_SNAP_MAP, 8181317Sihse DMU_OT_NONE, 0, tx); 8191120Schegar dsphys->ds_creation_time = gethrestime_sec(); 8202084Serikj dsphys->ds_creation_txg = tx->tx_txg == TXG_INITIAL ? 1 : tx->tx_txg; 8211120Schegar 8221120Schegar if (origin == NULL) { 8231120Schegar dsphys->ds_deadlist_obj = dsl_deadlist_alloc(mos, tx); 8241120Schegar } else { 8251120Schegar dsl_dataset_t *ohds; /* head of the origin snapshot */ 8261120Schegar 8271120Schegar dsphys->ds_prev_snap_obj = origin->ds_object; 8281236Sihse dsphys->ds_prev_snap_txg = 8291156Serikj dsl_dataset_phys(origin)->ds_creation_txg; 8301120Schegar dsphys->ds_referenced_bytes = 8311223Schegar dsl_dataset_phys(origin)->ds_referenced_bytes; 8321961Salanb dsphys->ds_compressed_bytes = 8331223Schegar dsl_dataset_phys(origin)->ds_compressed_bytes; 8341725Sihse dsphys->ds_uncompressed_bytes = 8351725Sihse dsl_dataset_phys(origin)->ds_uncompressed_bytes; 8361641Sihse rrw_enter(&origin->ds_bp_rwlock, RW_READER, FTAG); 8371345Sihse dsphys->ds_bp = dsl_dataset_phys(origin)->ds_bp; 8381428Serikj rrw_exit(&origin->ds_bp_rwlock, FTAG); 8391223Schegar 8401223Schegar /* 8411223Schegar * Inherit flags that describe the dataset's contents 8421223Schegar * (INCONSISTENT) or properties (Case Insensitive). 8431223Schegar */ 844492SN/A dsphys->ds_flags |= dsl_dataset_phys(origin)->ds_flags & 845492SN/A (DS_FLAG_INCONSISTENT | DS_FLAG_CI_DATASET); 8461223Schegar 8471428Serikj for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 8481120Schegar if (origin->ds_feature_inuse[f]) 8491120Schegar dsl_dataset_activate_feature(dsobj, f, tx); 8501223Schegar } 8511223Schegar 8521223Schegar dmu_buf_will_dirty(origin->ds_dbuf, tx); 8531725Sihse dsl_dataset_phys(origin)->ds_num_children++; 8541725Sihse 8551725Sihse VERIFY0(dsl_dataset_hold_obj(dp, 8561345Sihse dsl_dir_phys(origin->ds_dir)->dd_head_dataset_obj, 8571345Sihse FTAG, &ohds)); 8581345Sihse dsphys->ds_deadlist_obj = dsl_deadlist_clone(&ohds->ds_deadlist, 8591223Schegar dsphys->ds_prev_snap_txg, dsphys->ds_prev_snap_obj, tx); 8601223Schegar dsl_dataset_rele(ohds, FTAG); 8611223Schegar 8621223Schegar if (spa_version(dp->dp_spa) >= SPA_VERSION_NEXT_CLONES) { 8631223Schegar if (dsl_dataset_phys(origin)->ds_next_clones_obj == 0) { 8641223Schegar dsl_dataset_phys(origin)->ds_next_clones_obj = 8651223Schegar zap_create(mos, 8661223Schegar DMU_OT_NEXT_CLONES, DMU_OT_NONE, 0, tx); 8671223Schegar } 8681223Schegar VERIFY0(zap_add_int(mos, 8691223Schegar dsl_dataset_phys(origin)->ds_next_clones_obj, 8701223Schegar dsobj, tx)); 8711223Schegar } 8721223Schegar 8731120Schegar dmu_buf_will_dirty(dd->dd_dbuf, tx); 8741428Serikj dsl_dir_phys(dd)->dd_origin_obj = origin->ds_object; 8751428Serikj if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 876492SN/A if (dsl_dir_phys(origin->ds_dir)->dd_clones == 0) { 8771428Serikj dmu_buf_will_dirty(origin->ds_dir->dd_dbuf, tx); 8781428Serikj dsl_dir_phys(origin->ds_dir)->dd_clones = 8791120Schegar zap_create(mos, 880837SN/A DMU_OT_DSL_CLONES, DMU_OT_NONE, 0, tx); 881837SN/A } 882837SN/A VERIFY0(zap_add_int(mos, 8831120Schegar dsl_dir_phys(origin->ds_dir)->dd_clones, 8841120Schegar dsobj, tx)); 885837SN/A } 886837SN/A } 8871120Schegar 8881120Schegar if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 8891725Sihse dsphys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 8901725Sihse 8911725Sihse dmu_buf_rele(dbuf, FTAG); 8921120Schegar 8931120Schegar dmu_buf_will_dirty(dd->dd_dbuf, tx); 8941120Schegar dsl_dir_phys(dd)->dd_head_dataset_obj = dsobj; 8951120Schegar 896492SN/A return (dsobj); 8971410Sihse} 8981410Sihse 8991410Sihsestatic void 9001410Sihsedsl_dataset_zero_zil(dsl_dataset_t *ds, dmu_tx_t *tx) 9011410Sihse{ 9021410Sihse objset_t *os; 9031410Sihse 9041410Sihse VERIFY0(dmu_objset_from_ds(ds, &os)); 9051410Sihse bzero(&os->os_zil_header, sizeof (os->os_zil_header)); 9061426Sihse dsl_dataset_dirty(ds, tx); 9071426Sihse} 9081426Sihse 9091410Sihseuint64_t 9101410Sihsedsl_dataset_create_sync(dsl_dir_t *pdd, const char *lastname, 9111410Sihse dsl_dataset_t *origin, uint64_t flags, cred_t *cr, dmu_tx_t *tx) 9121410Sihse{ 9131410Sihse dsl_pool_t *dp = pdd->dd_pool; 9141410Sihse uint64_t dsobj, ddobj; 9151426Sihse dsl_dir_t *dd; 9161862Serikj 9171426Sihse ASSERT(dmu_tx_is_syncing(tx)); 9181426Sihse ASSERT(lastname[0] != '@'); 9191120Schegar 9201120Schegar ddobj = dsl_dir_create_sync(dp, pdd, lastname, tx); 9211120Schegar VERIFY0(dsl_dir_hold_obj(dp, ddobj, lastname, FTAG, &dd)); 9222040Sdholmes 9232040Sdholmes dsobj = dsl_dataset_create_sync_dd(dd, origin, 9242040Sdholmes flags & ~DS_CREATE_FLAG_NODIRTY, tx); 9252040Sdholmes 9261120Schegar dsl_deleg_set_create_perms(dd, tx, cr); 9271120Schegar 928492SN/A /* 929 * Since we're creating a new node we know it's a leaf, so we can 930 * initialize the counts if the limit feature is active. 931 */ 932 if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT)) { 933 uint64_t cnt = 0; 934 objset_t *os = dd->dd_pool->dp_meta_objset; 935 936 dsl_dir_zapify(dd, tx); 937 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT, 938 sizeof (cnt), 1, &cnt, tx)); 939 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_SNAPSHOT_COUNT, 940 sizeof (cnt), 1, &cnt, tx)); 941 } 942 943 dsl_dir_rele(dd, FTAG); 944 945 /* 946 * If we are creating a clone, make sure we zero out any stale 947 * data from the origin snapshots zil header. 948 */ 949 if (origin != NULL && !(flags & DS_CREATE_FLAG_NODIRTY)) { 950 dsl_dataset_t *ds; 951 952 VERIFY0(dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds)); 953 dsl_dataset_zero_zil(ds, tx); 954 dsl_dataset_rele(ds, FTAG); 955 } 956 957 return (dsobj); 958} 959 960#ifdef __FreeBSD__ 961/* FreeBSD ioctl compat begin */ 962struct destroyarg { 963 nvlist_t *nvl; 964 const char *snapname; 965}; 966 967static int 968dsl_check_snap_cb(const char *name, void *arg) 969{ 970 struct destroyarg *da = arg; 971 dsl_dataset_t *ds; 972 char *dsname; 973 974 dsname = kmem_asprintf("%s@%s", name, da->snapname); 975 fnvlist_add_boolean(da->nvl, dsname); 976 kmem_free(dsname, strlen(dsname) + 1); 977 978 return (0); 979} 980 981int 982dmu_get_recursive_snaps_nvl(char *fsname, const char *snapname, 983 nvlist_t *snaps) 984{ 985 struct destroyarg *da; 986 int err; 987 988 da = kmem_zalloc(sizeof (struct destroyarg), KM_SLEEP); 989 da->nvl = snaps; 990 da->snapname = snapname; 991 err = dmu_objset_find(fsname, dsl_check_snap_cb, da, 992 DS_FIND_CHILDREN); 993 kmem_free(da, sizeof (struct destroyarg)); 994 995 return (err); 996} 997/* FreeBSD ioctl compat end */ 998#endif /* __FreeBSD__ */ 999 1000/* 1001 * The unique space in the head dataset can be calculated by subtracting 1002 * the space used in the most recent snapshot, that is still being used 1003 * in this file system, from the space currently in use. To figure out 1004 * the space in the most recent snapshot still in use, we need to take 1005 * the total space used in the snapshot and subtract out the space that 1006 * has been freed up since the snapshot was taken. 1007 */ 1008void 1009dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds) 1010{ 1011 uint64_t mrs_used; 1012 uint64_t dlused, dlcomp, dluncomp; 1013 1014 ASSERT(!ds->ds_is_snapshot); 1015 1016 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) 1017 mrs_used = dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes; 1018 else 1019 mrs_used = 0; 1020 1021 dsl_deadlist_space(&ds->ds_deadlist, &dlused, &dlcomp, &dluncomp); 1022 1023 ASSERT3U(dlused, <=, mrs_used); 1024 dsl_dataset_phys(ds)->ds_unique_bytes = 1025 dsl_dataset_phys(ds)->ds_referenced_bytes - (mrs_used - dlused); 1026 1027 if (spa_version(ds->ds_dir->dd_pool->dp_spa) >= 1028 SPA_VERSION_UNIQUE_ACCURATE) 1029 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1030} 1031 1032void 1033dsl_dataset_remove_from_next_clones(dsl_dataset_t *ds, uint64_t obj, 1034 dmu_tx_t *tx) 1035{ 1036 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 1037 uint64_t count; 1038 int err; 1039 1040 ASSERT(dsl_dataset_phys(ds)->ds_num_children >= 2); 1041 err = zap_remove_int(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 1042 obj, tx); 1043 /* 1044 * The err should not be ENOENT, but a bug in a previous version 1045 * of the code could cause upgrade_clones_cb() to not set 1046 * ds_next_snap_obj when it should, leading to a missing entry. 1047 * If we knew that the pool was created after 1048 * SPA_VERSION_NEXT_CLONES, we could assert that it isn't 1049 * ENOENT. However, at least we can check that we don't have 1050 * too many entries in the next_clones_obj even after failing to 1051 * remove this one. 1052 */ 1053 if (err != ENOENT) 1054 VERIFY0(err); 1055 ASSERT0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 1056 &count)); 1057 ASSERT3U(count, <=, dsl_dataset_phys(ds)->ds_num_children - 2); 1058} 1059 1060 1061blkptr_t * 1062dsl_dataset_get_blkptr(dsl_dataset_t *ds) 1063{ 1064 return (&dsl_dataset_phys(ds)->ds_bp); 1065} 1066 1067spa_t * 1068dsl_dataset_get_spa(dsl_dataset_t *ds) 1069{ 1070 return (ds->ds_dir->dd_pool->dp_spa); 1071} 1072 1073void 1074dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx) 1075{ 1076 dsl_pool_t *dp; 1077 1078 if (ds == NULL) /* this is the meta-objset */ 1079 return; 1080 1081 ASSERT(ds->ds_objset != NULL); 1082 1083 if (dsl_dataset_phys(ds)->ds_next_snap_obj != 0) 1084 panic("dirtying snapshot!"); 1085 1086 dp = ds->ds_dir->dd_pool; 1087 1088 if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg)) { 1089 /* up the hold count until we can be written out */ 1090 dmu_buf_add_ref(ds->ds_dbuf, ds); 1091 } 1092} 1093 1094boolean_t 1095dsl_dataset_is_dirty(dsl_dataset_t *ds) 1096{ 1097 for (int t = 0; t < TXG_SIZE; t++) { 1098 if (txg_list_member(&ds->ds_dir->dd_pool->dp_dirty_datasets, 1099 ds, t)) 1100 return (B_TRUE); 1101 } 1102 return (B_FALSE); 1103} 1104 1105static int 1106dsl_dataset_snapshot_reserve_space(dsl_dataset_t *ds, dmu_tx_t *tx) 1107{ 1108 uint64_t asize; 1109 1110 if (!dmu_tx_is_syncing(tx)) 1111 return (0); 1112 1113 /* 1114 * If there's an fs-only reservation, any blocks that might become 1115 * owned by the snapshot dataset must be accommodated by space 1116 * outside of the reservation. 1117 */ 1118 ASSERT(ds->ds_reserved == 0 || DS_UNIQUE_IS_ACCURATE(ds)); 1119 asize = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, ds->ds_reserved); 1120 if (asize > dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) 1121 return (SET_ERROR(ENOSPC)); 1122 1123 /* 1124 * Propagate any reserved space for this snapshot to other 1125 * snapshot checks in this sync group. 1126 */ 1127 if (asize > 0) 1128 dsl_dir_willuse_space(ds->ds_dir, asize, tx); 1129 1130 return (0); 1131} 1132 1133typedef struct dsl_dataset_snapshot_arg { 1134 nvlist_t *ddsa_snaps; 1135 nvlist_t *ddsa_props; 1136 nvlist_t *ddsa_errors; 1137 cred_t *ddsa_cr; 1138} dsl_dataset_snapshot_arg_t; 1139 1140int 1141dsl_dataset_snapshot_check_impl(dsl_dataset_t *ds, const char *snapname, 1142 dmu_tx_t *tx, boolean_t recv, uint64_t cnt, cred_t *cr) 1143{ 1144 int error; 1145 uint64_t value; 1146 1147 ds->ds_trysnap_txg = tx->tx_txg; 1148 1149 if (!dmu_tx_is_syncing(tx)) 1150 return (0); 1151 1152 /* 1153 * We don't allow multiple snapshots of the same txg. If there 1154 * is already one, try again. 1155 */ 1156 if (dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg) 1157 return (SET_ERROR(EAGAIN)); 1158 1159 /* 1160 * Check for conflicting snapshot name. 1161 */ 1162 error = dsl_dataset_snap_lookup(ds, snapname, &value); 1163 if (error == 0) 1164 return (SET_ERROR(EEXIST)); 1165 if (error != ENOENT) 1166 return (error); 1167 1168 /* 1169 * We don't allow taking snapshots of inconsistent datasets, such as 1170 * those into which we are currently receiving. However, if we are 1171 * creating this snapshot as part of a receive, this check will be 1172 * executed atomically with respect to the completion of the receive 1173 * itself but prior to the clearing of DS_FLAG_INCONSISTENT; in this 1174 * case we ignore this, knowing it will be fixed up for us shortly in 1175 * dmu_recv_end_sync(). 1176 */ 1177 if (!recv && DS_IS_INCONSISTENT(ds)) 1178 return (SET_ERROR(EBUSY)); 1179 1180 /* 1181 * Skip the check for temporary snapshots or if we have already checked 1182 * the counts in dsl_dataset_snapshot_check. This means we really only 1183 * check the count here when we're receiving a stream. 1184 */ 1185 if (cnt != 0 && cr != NULL) { 1186 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt, 1187 ZFS_PROP_SNAPSHOT_LIMIT, NULL, cr); 1188 if (error != 0) 1189 return (error); 1190 } 1191 1192 error = dsl_dataset_snapshot_reserve_space(ds, tx); 1193 if (error != 0) 1194 return (error); 1195 1196 return (0); 1197} 1198 1199static int 1200dsl_dataset_snapshot_check(void *arg, dmu_tx_t *tx) 1201{ 1202 dsl_dataset_snapshot_arg_t *ddsa = arg; 1203 dsl_pool_t *dp = dmu_tx_pool(tx); 1204 nvpair_t *pair; 1205 int rv = 0; 1206 1207 /* 1208 * Pre-compute how many total new snapshots will be created for each 1209 * level in the tree and below. This is needed for validating the 1210 * snapshot limit when either taking a recursive snapshot or when 1211 * taking multiple snapshots. 1212 * 1213 * The problem is that the counts are not actually adjusted when 1214 * we are checking, only when we finally sync. For a single snapshot, 1215 * this is easy, the count will increase by 1 at each node up the tree, 1216 * but its more complicated for the recursive/multiple snapshot case. 1217 * 1218 * The dsl_fs_ss_limit_check function does recursively check the count 1219 * at each level up the tree but since it is validating each snapshot 1220 * independently we need to be sure that we are validating the complete 1221 * count for the entire set of snapshots. We do this by rolling up the 1222 * counts for each component of the name into an nvlist and then 1223 * checking each of those cases with the aggregated count. 1224 * 1225 * This approach properly handles not only the recursive snapshot 1226 * case (where we get all of those on the ddsa_snaps list) but also 1227 * the sibling case (e.g. snapshot a/b and a/c so that we will also 1228 * validate the limit on 'a' using a count of 2). 1229 * 1230 * We validate the snapshot names in the third loop and only report 1231 * name errors once. 1232 */ 1233 if (dmu_tx_is_syncing(tx)) { 1234 nvlist_t *cnt_track = NULL; 1235 cnt_track = fnvlist_alloc(); 1236 1237 /* Rollup aggregated counts into the cnt_track list */ 1238 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1239 pair != NULL; 1240 pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1241 char *pdelim; 1242 uint64_t val; 1243 char nm[MAXPATHLEN]; 1244 1245 (void) strlcpy(nm, nvpair_name(pair), sizeof (nm)); 1246 pdelim = strchr(nm, '@'); 1247 if (pdelim == NULL) 1248 continue; 1249 *pdelim = '\0'; 1250 1251 do { 1252 if (nvlist_lookup_uint64(cnt_track, nm, 1253 &val) == 0) { 1254 /* update existing entry */ 1255 fnvlist_add_uint64(cnt_track, nm, 1256 val + 1); 1257 } else { 1258 /* add to list */ 1259 fnvlist_add_uint64(cnt_track, nm, 1); 1260 } 1261 1262 pdelim = strrchr(nm, '/'); 1263 if (pdelim != NULL) 1264 *pdelim = '\0'; 1265 } while (pdelim != NULL); 1266 } 1267 1268 /* Check aggregated counts at each level */ 1269 for (pair = nvlist_next_nvpair(cnt_track, NULL); 1270 pair != NULL; pair = nvlist_next_nvpair(cnt_track, pair)) { 1271 int error = 0; 1272 char *name; 1273 uint64_t cnt = 0; 1274 dsl_dataset_t *ds; 1275 1276 name = nvpair_name(pair); 1277 cnt = fnvpair_value_uint64(pair); 1278 ASSERT(cnt > 0); 1279 1280 error = dsl_dataset_hold(dp, name, FTAG, &ds); 1281 if (error == 0) { 1282 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt, 1283 ZFS_PROP_SNAPSHOT_LIMIT, NULL, 1284 ddsa->ddsa_cr); 1285 dsl_dataset_rele(ds, FTAG); 1286 } 1287 1288 if (error != 0) { 1289 if (ddsa->ddsa_errors != NULL) 1290 fnvlist_add_int32(ddsa->ddsa_errors, 1291 name, error); 1292 rv = error; 1293 /* only report one error for this check */ 1294 break; 1295 } 1296 } 1297 nvlist_free(cnt_track); 1298 } 1299 1300 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1301 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1302 int error = 0; 1303 dsl_dataset_t *ds; 1304 char *name, *atp; 1305 char dsname[ZFS_MAX_DATASET_NAME_LEN]; 1306 1307 name = nvpair_name(pair); 1308 if (strlen(name) >= ZFS_MAX_DATASET_NAME_LEN) 1309 error = SET_ERROR(ENAMETOOLONG); 1310 if (error == 0) { 1311 atp = strchr(name, '@'); 1312 if (atp == NULL) 1313 error = SET_ERROR(EINVAL); 1314 if (error == 0) 1315 (void) strlcpy(dsname, name, atp - name + 1); 1316 } 1317 if (error == 0) 1318 error = dsl_dataset_hold(dp, dsname, FTAG, &ds); 1319 if (error == 0) { 1320 /* passing 0/NULL skips dsl_fs_ss_limit_check */ 1321 error = dsl_dataset_snapshot_check_impl(ds, 1322 atp + 1, tx, B_FALSE, 0, NULL); 1323 dsl_dataset_rele(ds, FTAG); 1324 } 1325 1326 if (error != 0) { 1327 if (ddsa->ddsa_errors != NULL) { 1328 fnvlist_add_int32(ddsa->ddsa_errors, 1329 name, error); 1330 } 1331 rv = error; 1332 } 1333 } 1334 1335 return (rv); 1336} 1337 1338void 1339dsl_dataset_snapshot_sync_impl(dsl_dataset_t *ds, const char *snapname, 1340 dmu_tx_t *tx) 1341{ 1342 static zil_header_t zero_zil; 1343 1344 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1345 dmu_buf_t *dbuf; 1346 dsl_dataset_phys_t *dsphys; 1347 uint64_t dsobj, crtxg; 1348 objset_t *mos = dp->dp_meta_objset; 1349 objset_t *os; 1350 1351 ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock)); 1352 1353 /* 1354 * If we are on an old pool, the zil must not be active, in which 1355 * case it will be zeroed. Usually zil_suspend() accomplishes this. 1356 */ 1357 ASSERT(spa_version(dmu_tx_pool(tx)->dp_spa) >= SPA_VERSION_FAST_SNAP || 1358 dmu_objset_from_ds(ds, &os) != 0 || 1359 bcmp(&os->os_phys->os_zil_header, &zero_zil, 1360 sizeof (zero_zil)) == 0); 1361 1362 dsl_fs_ss_count_adjust(ds->ds_dir, 1, DD_FIELD_SNAPSHOT_COUNT, tx); 1363 1364 /* 1365 * The origin's ds_creation_txg has to be < TXG_INITIAL 1366 */ 1367 if (strcmp(snapname, ORIGIN_DIR_NAME) == 0) 1368 crtxg = 1; 1369 else 1370 crtxg = tx->tx_txg; 1371 1372 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 1373 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 1374 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 1375 dmu_buf_will_dirty(dbuf, tx); 1376 dsphys = dbuf->db_data; 1377 bzero(dsphys, sizeof (dsl_dataset_phys_t)); 1378 dsphys->ds_dir_obj = ds->ds_dir->dd_object; 1379 dsphys->ds_fsid_guid = unique_create(); 1380 do { 1381 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 1382 sizeof (dsphys->ds_guid)); 1383 } while (dsphys->ds_guid == 0); 1384 dsphys->ds_prev_snap_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 1385 dsphys->ds_prev_snap_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg; 1386 dsphys->ds_next_snap_obj = ds->ds_object; 1387 dsphys->ds_num_children = 1; 1388 dsphys->ds_creation_time = gethrestime_sec(); 1389 dsphys->ds_creation_txg = crtxg; 1390 dsphys->ds_deadlist_obj = dsl_dataset_phys(ds)->ds_deadlist_obj; 1391 dsphys->ds_referenced_bytes = dsl_dataset_phys(ds)->ds_referenced_bytes; 1392 dsphys->ds_compressed_bytes = dsl_dataset_phys(ds)->ds_compressed_bytes; 1393 dsphys->ds_uncompressed_bytes = 1394 dsl_dataset_phys(ds)->ds_uncompressed_bytes; 1395 dsphys->ds_flags = dsl_dataset_phys(ds)->ds_flags; 1396 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG); 1397 dsphys->ds_bp = dsl_dataset_phys(ds)->ds_bp; 1398 rrw_exit(&ds->ds_bp_rwlock, FTAG); 1399 dmu_buf_rele(dbuf, FTAG); 1400 1401 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 1402 if (ds->ds_feature_inuse[f]) 1403 dsl_dataset_activate_feature(dsobj, f, tx); 1404 } 1405 1406 ASSERT3U(ds->ds_prev != 0, ==, 1407 dsl_dataset_phys(ds)->ds_prev_snap_obj != 0); 1408 if (ds->ds_prev) { 1409 uint64_t next_clones_obj = 1410 dsl_dataset_phys(ds->ds_prev)->ds_next_clones_obj; 1411 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 1412 ds->ds_object || 1413 dsl_dataset_phys(ds->ds_prev)->ds_num_children > 1); 1414 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 1415 ds->ds_object) { 1416 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 1417 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, ==, 1418 dsl_dataset_phys(ds->ds_prev)->ds_creation_txg); 1419 dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj = dsobj; 1420 } else if (next_clones_obj != 0) { 1421 dsl_dataset_remove_from_next_clones(ds->ds_prev, 1422 dsphys->ds_next_snap_obj, tx); 1423 VERIFY0(zap_add_int(mos, 1424 next_clones_obj, dsobj, tx)); 1425 } 1426 } 1427 1428 /* 1429 * If we have a reference-reservation on this dataset, we will 1430 * need to increase the amount of refreservation being charged 1431 * since our unique space is going to zero. 1432 */ 1433 if (ds->ds_reserved) { 1434 int64_t delta; 1435 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 1436 delta = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, 1437 ds->ds_reserved); 1438 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, 1439 delta, 0, 0, tx); 1440 } 1441 1442 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1443 dsl_dataset_phys(ds)->ds_deadlist_obj = 1444 dsl_deadlist_clone(&ds->ds_deadlist, UINT64_MAX, 1445 dsl_dataset_phys(ds)->ds_prev_snap_obj, tx); 1446 dsl_deadlist_close(&ds->ds_deadlist); 1447 dsl_deadlist_open(&ds->ds_deadlist, mos, 1448 dsl_dataset_phys(ds)->ds_deadlist_obj); 1449 dsl_deadlist_add_key(&ds->ds_deadlist, 1450 dsl_dataset_phys(ds)->ds_prev_snap_txg, tx); 1451 1452 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, <, tx->tx_txg); 1453 dsl_dataset_phys(ds)->ds_prev_snap_obj = dsobj; 1454 dsl_dataset_phys(ds)->ds_prev_snap_txg = crtxg; 1455 dsl_dataset_phys(ds)->ds_unique_bytes = 0; 1456 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 1457 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1458 1459 VERIFY0(zap_add(mos, dsl_dataset_phys(ds)->ds_snapnames_zapobj, 1460 snapname, 8, 1, &dsobj, tx)); 1461 1462 if (ds->ds_prev) 1463 dsl_dataset_rele(ds->ds_prev, ds); 1464 VERIFY0(dsl_dataset_hold_obj(dp, 1465 dsl_dataset_phys(ds)->ds_prev_snap_obj, ds, &ds->ds_prev)); 1466 1467 dsl_scan_ds_snapshotted(ds, tx); 1468 1469 dsl_dir_snap_cmtime_update(ds->ds_dir); 1470 1471 spa_history_log_internal_ds(ds->ds_prev, "snapshot", tx, ""); 1472} 1473 1474static void 1475dsl_dataset_snapshot_sync(void *arg, dmu_tx_t *tx) 1476{ 1477 dsl_dataset_snapshot_arg_t *ddsa = arg; 1478 dsl_pool_t *dp = dmu_tx_pool(tx); 1479 nvpair_t *pair; 1480 1481 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1482 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1483 dsl_dataset_t *ds; 1484 char *name, *atp; 1485 char dsname[ZFS_MAX_DATASET_NAME_LEN]; 1486 1487 name = nvpair_name(pair); 1488 atp = strchr(name, '@'); 1489 (void) strlcpy(dsname, name, atp - name + 1); 1490 VERIFY0(dsl_dataset_hold(dp, dsname, FTAG, &ds)); 1491 1492 dsl_dataset_snapshot_sync_impl(ds, atp + 1, tx); 1493 if (ddsa->ddsa_props != NULL) { 1494 dsl_props_set_sync_impl(ds->ds_prev, 1495 ZPROP_SRC_LOCAL, ddsa->ddsa_props, tx); 1496 } 1497 dsl_dataset_rele(ds, FTAG); 1498 } 1499} 1500 1501/* 1502 * The snapshots must all be in the same pool. 1503 * All-or-nothing: if there are any failures, nothing will be modified. 1504 */ 1505int 1506dsl_dataset_snapshot(nvlist_t *snaps, nvlist_t *props, nvlist_t *errors) 1507{ 1508 dsl_dataset_snapshot_arg_t ddsa; 1509 nvpair_t *pair; 1510 boolean_t needsuspend; 1511 int error; 1512 spa_t *spa; 1513 char *firstname; 1514 nvlist_t *suspended = NULL; 1515 1516 pair = nvlist_next_nvpair(snaps, NULL); 1517 if (pair == NULL) 1518 return (0); 1519 firstname = nvpair_name(pair); 1520 1521 error = spa_open(firstname, &spa, FTAG); 1522 if (error != 0) 1523 return (error); 1524 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); 1525 spa_close(spa, FTAG); 1526 1527 if (needsuspend) { 1528 suspended = fnvlist_alloc(); 1529 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL; 1530 pair = nvlist_next_nvpair(snaps, pair)) { 1531 char fsname[ZFS_MAX_DATASET_NAME_LEN]; 1532 char *snapname = nvpair_name(pair); 1533 char *atp; 1534 void *cookie; 1535 1536 atp = strchr(snapname, '@'); 1537 if (atp == NULL) { 1538 error = SET_ERROR(EINVAL); 1539 break; 1540 } 1541 (void) strlcpy(fsname, snapname, atp - snapname + 1); 1542 1543 error = zil_suspend(fsname, &cookie); 1544 if (error != 0) 1545 break; 1546 fnvlist_add_uint64(suspended, fsname, 1547 (uintptr_t)cookie); 1548 } 1549 } 1550 1551 ddsa.ddsa_snaps = snaps; 1552 ddsa.ddsa_props = props; 1553 ddsa.ddsa_errors = errors; 1554 ddsa.ddsa_cr = CRED(); 1555 1556 if (error == 0) { 1557 error = dsl_sync_task(firstname, dsl_dataset_snapshot_check, 1558 dsl_dataset_snapshot_sync, &ddsa, 1559 fnvlist_num_pairs(snaps) * 3, ZFS_SPACE_CHECK_NORMAL); 1560 } 1561 1562 if (suspended != NULL) { 1563 for (pair = nvlist_next_nvpair(suspended, NULL); pair != NULL; 1564 pair = nvlist_next_nvpair(suspended, pair)) { 1565 zil_resume((void *)(uintptr_t) 1566 fnvpair_value_uint64(pair)); 1567 } 1568 fnvlist_free(suspended); 1569 } 1570 1571#ifdef __FreeBSD__ 1572#ifdef _KERNEL 1573 if (error == 0) { 1574 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL; 1575 pair = nvlist_next_nvpair(snaps, pair)) { 1576 char *snapname = nvpair_name(pair); 1577 zvol_create_minors(snapname); 1578 } 1579 } 1580#endif 1581#endif 1582 return (error); 1583} 1584 1585typedef struct dsl_dataset_snapshot_tmp_arg { 1586 const char *ddsta_fsname; 1587 const char *ddsta_snapname; 1588 minor_t ddsta_cleanup_minor; 1589 const char *ddsta_htag; 1590} dsl_dataset_snapshot_tmp_arg_t; 1591 1592static int 1593dsl_dataset_snapshot_tmp_check(void *arg, dmu_tx_t *tx) 1594{ 1595 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; 1596 dsl_pool_t *dp = dmu_tx_pool(tx); 1597 dsl_dataset_t *ds; 1598 int error; 1599 1600 error = dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds); 1601 if (error != 0) 1602 return (error); 1603 1604 /* NULL cred means no limit check for tmp snapshot */ 1605 error = dsl_dataset_snapshot_check_impl(ds, ddsta->ddsta_snapname, 1606 tx, B_FALSE, 0, NULL); 1607 if (error != 0) { 1608 dsl_dataset_rele(ds, FTAG); 1609 return (error); 1610 } 1611 1612 if (spa_version(dp->dp_spa) < SPA_VERSION_USERREFS) { 1613 dsl_dataset_rele(ds, FTAG); 1614 return (SET_ERROR(ENOTSUP)); 1615 } 1616 error = dsl_dataset_user_hold_check_one(NULL, ddsta->ddsta_htag, 1617 B_TRUE, tx); 1618 if (error != 0) { 1619 dsl_dataset_rele(ds, FTAG); 1620 return (error); 1621 } 1622 1623 dsl_dataset_rele(ds, FTAG); 1624 return (0); 1625} 1626 1627static void 1628dsl_dataset_snapshot_tmp_sync(void *arg, dmu_tx_t *tx) 1629{ 1630 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; 1631 dsl_pool_t *dp = dmu_tx_pool(tx); 1632 dsl_dataset_t *ds; 1633 1634 VERIFY0(dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds)); 1635 1636 dsl_dataset_snapshot_sync_impl(ds, ddsta->ddsta_snapname, tx); 1637 dsl_dataset_user_hold_sync_one(ds->ds_prev, ddsta->ddsta_htag, 1638 ddsta->ddsta_cleanup_minor, gethrestime_sec(), tx); 1639 dsl_destroy_snapshot_sync_impl(ds->ds_prev, B_TRUE, tx); 1640 1641 dsl_dataset_rele(ds, FTAG); 1642} 1643 1644int 1645dsl_dataset_snapshot_tmp(const char *fsname, const char *snapname, 1646 minor_t cleanup_minor, const char *htag) 1647{ 1648 dsl_dataset_snapshot_tmp_arg_t ddsta; 1649 int error; 1650 spa_t *spa; 1651 boolean_t needsuspend; 1652 void *cookie; 1653 1654 ddsta.ddsta_fsname = fsname; 1655 ddsta.ddsta_snapname = snapname; 1656 ddsta.ddsta_cleanup_minor = cleanup_minor; 1657 ddsta.ddsta_htag = htag; 1658 1659 error = spa_open(fsname, &spa, FTAG); 1660 if (error != 0) 1661 return (error); 1662 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); 1663 spa_close(spa, FTAG); 1664 1665 if (needsuspend) { 1666 error = zil_suspend(fsname, &cookie); 1667 if (error != 0) 1668 return (error); 1669 } 1670 1671 error = dsl_sync_task(fsname, dsl_dataset_snapshot_tmp_check, 1672 dsl_dataset_snapshot_tmp_sync, &ddsta, 3, ZFS_SPACE_CHECK_RESERVED); 1673 1674 if (needsuspend) 1675 zil_resume(cookie); 1676 return (error); 1677} 1678 1679 1680void 1681dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx) 1682{ 1683 ASSERT(dmu_tx_is_syncing(tx)); 1684 ASSERT(ds->ds_objset != NULL); 1685 ASSERT(dsl_dataset_phys(ds)->ds_next_snap_obj == 0); 1686 1687 /* 1688 * in case we had to change ds_fsid_guid when we opened it, 1689 * sync it out now. 1690 */ 1691 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1692 dsl_dataset_phys(ds)->ds_fsid_guid = ds->ds_fsid_guid; 1693 1694 if (ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] != 0) { 1695 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 1696 ds->ds_object, DS_FIELD_RESUME_OBJECT, 8, 1, 1697 &ds->ds_resume_object[tx->tx_txg & TXG_MASK], tx)); 1698 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 1699 ds->ds_object, DS_FIELD_RESUME_OFFSET, 8, 1, 1700 &ds->ds_resume_offset[tx->tx_txg & TXG_MASK], tx)); 1701 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 1702 ds->ds_object, DS_FIELD_RESUME_BYTES, 8, 1, 1703 &ds->ds_resume_bytes[tx->tx_txg & TXG_MASK], tx)); 1704 ds->ds_resume_object[tx->tx_txg & TXG_MASK] = 0; 1705 ds->ds_resume_offset[tx->tx_txg & TXG_MASK] = 0; 1706 ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] = 0; 1707 } 1708 1709 dmu_objset_sync(ds->ds_objset, zio, tx); 1710 1711 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 1712 if (ds->ds_feature_activation_needed[f]) { 1713 if (ds->ds_feature_inuse[f]) 1714 continue; 1715 dsl_dataset_activate_feature(ds->ds_object, f, tx); 1716 ds->ds_feature_inuse[f] = B_TRUE; 1717 } 1718 } 1719} 1720 1721static void 1722get_clones_stat(dsl_dataset_t *ds, nvlist_t *nv) 1723{ 1724 uint64_t count = 0; 1725 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 1726 zap_cursor_t zc; 1727 zap_attribute_t za; 1728 nvlist_t *propval = fnvlist_alloc(); 1729 nvlist_t *val = fnvlist_alloc(); 1730 1731 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 1732 1733 /* 1734 * There may be missing entries in ds_next_clones_obj 1735 * due to a bug in a previous version of the code. 1736 * Only trust it if it has the right number of entries. 1737 */ 1738 if (dsl_dataset_phys(ds)->ds_next_clones_obj != 0) { 1739 VERIFY0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 1740 &count)); 1741 } 1742 if (count != dsl_dataset_phys(ds)->ds_num_children - 1) 1743 goto fail; 1744 for (zap_cursor_init(&zc, mos, 1745 dsl_dataset_phys(ds)->ds_next_clones_obj); 1746 zap_cursor_retrieve(&zc, &za) == 0; 1747 zap_cursor_advance(&zc)) { 1748 dsl_dataset_t *clone; 1749 char buf[ZFS_MAX_DATASET_NAME_LEN]; 1750 VERIFY0(dsl_dataset_hold_obj(ds->ds_dir->dd_pool, 1751 za.za_first_integer, FTAG, &clone)); 1752 dsl_dir_name(clone->ds_dir, buf); 1753 fnvlist_add_boolean(val, buf); 1754 dsl_dataset_rele(clone, FTAG); 1755 } 1756 zap_cursor_fini(&zc); 1757 fnvlist_add_nvlist(propval, ZPROP_VALUE, val); 1758 fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_CLONES), propval); 1759fail: 1760 nvlist_free(val); 1761 nvlist_free(propval); 1762} 1763 1764static void 1765get_receive_resume_stats(dsl_dataset_t *ds, nvlist_t *nv) 1766{ 1767 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1768 1769 if (dsl_dataset_has_resume_receive_state(ds)) { 1770 char *str; 1771 void *packed; 1772 uint8_t *compressed; 1773 uint64_t val; 1774 nvlist_t *token_nv = fnvlist_alloc(); 1775 size_t packed_size, compressed_size; 1776 1777 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1778 DS_FIELD_RESUME_FROMGUID, sizeof (val), 1, &val) == 0) { 1779 fnvlist_add_uint64(token_nv, "fromguid", val); 1780 } 1781 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1782 DS_FIELD_RESUME_OBJECT, sizeof (val), 1, &val) == 0) { 1783 fnvlist_add_uint64(token_nv, "object", val); 1784 } 1785 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1786 DS_FIELD_RESUME_OFFSET, sizeof (val), 1, &val) == 0) { 1787 fnvlist_add_uint64(token_nv, "offset", val); 1788 } 1789 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1790 DS_FIELD_RESUME_BYTES, sizeof (val), 1, &val) == 0) { 1791 fnvlist_add_uint64(token_nv, "bytes", val); 1792 } 1793 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1794 DS_FIELD_RESUME_TOGUID, sizeof (val), 1, &val) == 0) { 1795 fnvlist_add_uint64(token_nv, "toguid", val); 1796 } 1797 char buf[256]; 1798 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1799 DS_FIELD_RESUME_TONAME, 1, sizeof (buf), buf) == 0) { 1800 fnvlist_add_string(token_nv, "toname", buf); 1801 } 1802 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 1803 DS_FIELD_RESUME_EMBEDOK) == 0) { 1804 fnvlist_add_boolean(token_nv, "embedok"); 1805 } 1806 packed = fnvlist_pack(token_nv, &packed_size); 1807 fnvlist_free(token_nv); 1808 compressed = kmem_alloc(packed_size, KM_SLEEP); 1809 1810 compressed_size = gzip_compress(packed, compressed, 1811 packed_size, packed_size, 6); 1812 1813 zio_cksum_t cksum; 1814 fletcher_4_native(compressed, compressed_size, NULL, &cksum); 1815 1816 str = kmem_alloc(compressed_size * 2 + 1, KM_SLEEP); 1817 for (int i = 0; i < compressed_size; i++) { 1818 (void) sprintf(str + i * 2, "%02x", compressed[i]); 1819 } 1820 str[compressed_size * 2] = '\0'; 1821 char *propval = kmem_asprintf("%u-%llx-%llx-%s", 1822 ZFS_SEND_RESUME_TOKEN_VERSION, 1823 (longlong_t)cksum.zc_word[0], 1824 (longlong_t)packed_size, str); 1825 dsl_prop_nvlist_add_string(nv, 1826 ZFS_PROP_RECEIVE_RESUME_TOKEN, propval); 1827 kmem_free(packed, packed_size); 1828 kmem_free(str, compressed_size * 2 + 1); 1829 kmem_free(compressed, packed_size); 1830 strfree(propval); 1831 } 1832} 1833 1834void 1835dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv) 1836{ 1837 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1838 uint64_t refd, avail, uobjs, aobjs, ratio; 1839 1840 ASSERT(dsl_pool_config_held(dp)); 1841 1842 ratio = dsl_dataset_phys(ds)->ds_compressed_bytes == 0 ? 100 : 1843 (dsl_dataset_phys(ds)->ds_uncompressed_bytes * 100 / 1844 dsl_dataset_phys(ds)->ds_compressed_bytes); 1845 1846 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRATIO, ratio); 1847 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_LOGICALREFERENCED, 1848 dsl_dataset_phys(ds)->ds_uncompressed_bytes); 1849 1850 if (ds->ds_is_snapshot) { 1851 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, ratio); 1852 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED, 1853 dsl_dataset_phys(ds)->ds_unique_bytes); 1854 get_clones_stat(ds, nv); 1855 } else { 1856 if (ds->ds_prev != NULL && ds->ds_prev != dp->dp_origin_snap) { 1857 char buf[ZFS_MAX_DATASET_NAME_LEN]; 1858 dsl_dataset_name(ds->ds_prev, buf); 1859 dsl_prop_nvlist_add_string(nv, ZFS_PROP_PREV_SNAP, buf); 1860 } 1861 1862 dsl_dir_stats(ds->ds_dir, nv); 1863 } 1864 1865 dsl_dataset_space(ds, &refd, &avail, &uobjs, &aobjs); 1866 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_AVAILABLE, avail); 1867 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED, refd); 1868 1869 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION, 1870 dsl_dataset_phys(ds)->ds_creation_time); 1871 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG, 1872 dsl_dataset_phys(ds)->ds_creation_txg); 1873 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFQUOTA, 1874 ds->ds_quota); 1875 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRESERVATION, 1876 ds->ds_reserved); 1877 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_GUID, 1878 dsl_dataset_phys(ds)->ds_guid); 1879 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_UNIQUE, 1880 dsl_dataset_phys(ds)->ds_unique_bytes); 1881 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_OBJSETID, 1882 ds->ds_object); 1883 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERREFS, 1884 ds->ds_userrefs); 1885 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_DEFER_DESTROY, 1886 DS_IS_DEFER_DESTROY(ds) ? 1 : 0); 1887 1888 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { 1889 uint64_t written, comp, uncomp; 1890 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1891 dsl_dataset_t *prev; 1892 1893 int err = dsl_dataset_hold_obj(dp, 1894 dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &prev); 1895 if (err == 0) { 1896 err = dsl_dataset_space_written(prev, ds, &written, 1897 &comp, &uncomp); 1898 dsl_dataset_rele(prev, FTAG); 1899 if (err == 0) { 1900 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_WRITTEN, 1901 written); 1902 } 1903 } 1904 } 1905 1906 if (!dsl_dataset_is_snapshot(ds)) { 1907 /* 1908 * A failed "newfs" (e.g. full) resumable receive leaves 1909 * the stats set on this dataset. Check here for the prop. 1910 */ 1911 get_receive_resume_stats(ds, nv); 1912 1913 /* 1914 * A failed incremental resumable receive leaves the 1915 * stats set on our child named "%recv". Check the child 1916 * for the prop. 1917 */ 1918 /* 6 extra bytes for /%recv */ 1919 char recvname[ZFS_MAX_DATASET_NAME_LEN + 6]; 1920 dsl_dataset_t *recv_ds; 1921 dsl_dataset_name(ds, recvname); 1922 if (strlcat(recvname, "/", sizeof (recvname)) < 1923 sizeof (recvname) && 1924 strlcat(recvname, recv_clone_name, sizeof (recvname)) < 1925 sizeof (recvname) && 1926 dsl_dataset_hold(dp, recvname, FTAG, &recv_ds) == 0) { 1927 get_receive_resume_stats(recv_ds, nv); 1928 dsl_dataset_rele(recv_ds, FTAG); 1929 } 1930 } 1931} 1932 1933void 1934dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat) 1935{ 1936 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1937 ASSERT(dsl_pool_config_held(dp)); 1938 1939 stat->dds_creation_txg = dsl_dataset_phys(ds)->ds_creation_txg; 1940 stat->dds_inconsistent = 1941 dsl_dataset_phys(ds)->ds_flags & DS_FLAG_INCONSISTENT; 1942 stat->dds_guid = dsl_dataset_phys(ds)->ds_guid; 1943 stat->dds_origin[0] = '\0'; 1944 if (ds->ds_is_snapshot) { 1945 stat->dds_is_snapshot = B_TRUE; 1946 stat->dds_num_clones = 1947 dsl_dataset_phys(ds)->ds_num_children - 1; 1948 } else { 1949 stat->dds_is_snapshot = B_FALSE; 1950 stat->dds_num_clones = 0; 1951 1952 if (dsl_dir_is_clone(ds->ds_dir)) { 1953 dsl_dataset_t *ods; 1954 1955 VERIFY0(dsl_dataset_hold_obj(dp, 1956 dsl_dir_phys(ds->ds_dir)->dd_origin_obj, 1957 FTAG, &ods)); 1958 dsl_dataset_name(ods, stat->dds_origin); 1959 dsl_dataset_rele(ods, FTAG); 1960 } 1961 } 1962} 1963 1964uint64_t 1965dsl_dataset_fsid_guid(dsl_dataset_t *ds) 1966{ 1967 return (ds->ds_fsid_guid); 1968} 1969 1970void 1971dsl_dataset_space(dsl_dataset_t *ds, 1972 uint64_t *refdbytesp, uint64_t *availbytesp, 1973 uint64_t *usedobjsp, uint64_t *availobjsp) 1974{ 1975 *refdbytesp = dsl_dataset_phys(ds)->ds_referenced_bytes; 1976 *availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE); 1977 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) 1978 *availbytesp += 1979 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes; 1980 if (ds->ds_quota != 0) { 1981 /* 1982 * Adjust available bytes according to refquota 1983 */ 1984 if (*refdbytesp < ds->ds_quota) 1985 *availbytesp = MIN(*availbytesp, 1986 ds->ds_quota - *refdbytesp); 1987 else 1988 *availbytesp = 0; 1989 } 1990 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG); 1991 *usedobjsp = BP_GET_FILL(&dsl_dataset_phys(ds)->ds_bp); 1992 rrw_exit(&ds->ds_bp_rwlock, FTAG); 1993 *availobjsp = DN_MAX_OBJECT - *usedobjsp; 1994} 1995 1996boolean_t 1997dsl_dataset_modified_since_snap(dsl_dataset_t *ds, dsl_dataset_t *snap) 1998{ 1999 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2000 uint64_t birth; 2001 2002 ASSERT(dsl_pool_config_held(dp)); 2003 if (snap == NULL) 2004 return (B_FALSE); 2005 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG); 2006 birth = dsl_dataset_get_blkptr(ds)->blk_birth; 2007 rrw_exit(&ds->ds_bp_rwlock, FTAG); 2008 if (birth > dsl_dataset_phys(snap)->ds_creation_txg) { 2009 objset_t *os, *os_snap; 2010 /* 2011 * It may be that only the ZIL differs, because it was 2012 * reset in the head. Don't count that as being 2013 * modified. 2014 */ 2015 if (dmu_objset_from_ds(ds, &os) != 0) 2016 return (B_TRUE); 2017 if (dmu_objset_from_ds(snap, &os_snap) != 0) 2018 return (B_TRUE); 2019 return (bcmp(&os->os_phys->os_meta_dnode, 2020 &os_snap->os_phys->os_meta_dnode, 2021 sizeof (os->os_phys->os_meta_dnode)) != 0); 2022 } 2023 return (B_FALSE); 2024} 2025 2026typedef struct dsl_dataset_rename_snapshot_arg { 2027 const char *ddrsa_fsname; 2028 const char *ddrsa_oldsnapname; 2029 const char *ddrsa_newsnapname; 2030 boolean_t ddrsa_recursive; 2031 dmu_tx_t *ddrsa_tx; 2032} dsl_dataset_rename_snapshot_arg_t; 2033 2034/* ARGSUSED */ 2035static int 2036dsl_dataset_rename_snapshot_check_impl(dsl_pool_t *dp, 2037 dsl_dataset_t *hds, void *arg) 2038{ 2039 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2040 int error; 2041 uint64_t val; 2042 2043 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 2044 if (error != 0) { 2045 /* ignore nonexistent snapshots */ 2046 return (error == ENOENT ? 0 : error); 2047 } 2048 2049 /* new name should not exist */ 2050 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_newsnapname, &val); 2051 if (error == 0) 2052 error = SET_ERROR(EEXIST); 2053 else if (error == ENOENT) 2054 error = 0; 2055 2056 /* dataset name + 1 for the "@" + the new snapshot name must fit */ 2057 if (dsl_dir_namelen(hds->ds_dir) + 1 + 2058 strlen(ddrsa->ddrsa_newsnapname) >= ZFS_MAX_DATASET_NAME_LEN) 2059 error = SET_ERROR(ENAMETOOLONG); 2060 2061 return (error); 2062} 2063 2064static int 2065dsl_dataset_rename_snapshot_check(void *arg, dmu_tx_t *tx) 2066{ 2067 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2068 dsl_pool_t *dp = dmu_tx_pool(tx); 2069 dsl_dataset_t *hds; 2070 int error; 2071 2072 error = dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds); 2073 if (error != 0) 2074 return (error); 2075 2076 if (ddrsa->ddrsa_recursive) { 2077 error = dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 2078 dsl_dataset_rename_snapshot_check_impl, ddrsa, 2079 DS_FIND_CHILDREN); 2080 } else { 2081 error = dsl_dataset_rename_snapshot_check_impl(dp, hds, ddrsa); 2082 } 2083 dsl_dataset_rele(hds, FTAG); 2084 return (error); 2085} 2086 2087static int 2088dsl_dataset_rename_snapshot_sync_impl(dsl_pool_t *dp, 2089 dsl_dataset_t *hds, void *arg) 2090{ 2091#ifdef __FreeBSD__ 2092#ifdef _KERNEL 2093 char *oldname, *newname; 2094#endif 2095#endif 2096 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2097 dsl_dataset_t *ds; 2098 uint64_t val; 2099 dmu_tx_t *tx = ddrsa->ddrsa_tx; 2100 int error; 2101 2102 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 2103 ASSERT(error == 0 || error == ENOENT); 2104 if (error == ENOENT) { 2105 /* ignore nonexistent snapshots */ 2106 return (0); 2107 } 2108 2109 VERIFY0(dsl_dataset_hold_obj(dp, val, FTAG, &ds)); 2110 2111 /* log before we change the name */ 2112 spa_history_log_internal_ds(ds, "rename", tx, 2113 "-> @%s", ddrsa->ddrsa_newsnapname); 2114 2115 VERIFY0(dsl_dataset_snap_remove(hds, ddrsa->ddrsa_oldsnapname, tx, 2116 B_FALSE)); 2117 mutex_enter(&ds->ds_lock); 2118 (void) strcpy(ds->ds_snapname, ddrsa->ddrsa_newsnapname); 2119 mutex_exit(&ds->ds_lock); 2120 VERIFY0(zap_add(dp->dp_meta_objset, 2121 dsl_dataset_phys(hds)->ds_snapnames_zapobj, 2122 ds->ds_snapname, 8, 1, &ds->ds_object, tx)); 2123 2124#ifdef __FreeBSD__ 2125#ifdef _KERNEL 2126 oldname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 2127 newname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 2128 snprintf(oldname, MAXPATHLEN, "%s@%s", ddrsa->ddrsa_fsname, 2129 ddrsa->ddrsa_oldsnapname); 2130 snprintf(newname, MAXPATHLEN, "%s@%s", ddrsa->ddrsa_fsname, 2131 ddrsa->ddrsa_newsnapname); 2132 zfsvfs_update_fromname(oldname, newname); 2133 zvol_rename_minors(oldname, newname); 2134 kmem_free(newname, MAXPATHLEN); 2135 kmem_free(oldname, MAXPATHLEN); 2136#endif 2137#endif 2138 dsl_dataset_rele(ds, FTAG); 2139 2140 return (0); 2141} 2142 2143static void 2144dsl_dataset_rename_snapshot_sync(void *arg, dmu_tx_t *tx) 2145{ 2146 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2147 dsl_pool_t *dp = dmu_tx_pool(tx); 2148 dsl_dataset_t *hds; 2149 2150 VERIFY0(dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds)); 2151 ddrsa->ddrsa_tx = tx; 2152 if (ddrsa->ddrsa_recursive) { 2153 VERIFY0(dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 2154 dsl_dataset_rename_snapshot_sync_impl, ddrsa, 2155 DS_FIND_CHILDREN)); 2156 } else { 2157 VERIFY0(dsl_dataset_rename_snapshot_sync_impl(dp, hds, ddrsa)); 2158 } 2159 dsl_dataset_rele(hds, FTAG); 2160} 2161 2162int 2163dsl_dataset_rename_snapshot(const char *fsname, 2164 const char *oldsnapname, const char *newsnapname, boolean_t recursive) 2165{ 2166 dsl_dataset_rename_snapshot_arg_t ddrsa; 2167 2168 ddrsa.ddrsa_fsname = fsname; 2169 ddrsa.ddrsa_oldsnapname = oldsnapname; 2170 ddrsa.ddrsa_newsnapname = newsnapname; 2171 ddrsa.ddrsa_recursive = recursive; 2172 2173 return (dsl_sync_task(fsname, dsl_dataset_rename_snapshot_check, 2174 dsl_dataset_rename_snapshot_sync, &ddrsa, 2175 1, ZFS_SPACE_CHECK_RESERVED)); 2176} 2177 2178/* 2179 * If we're doing an ownership handoff, we need to make sure that there is 2180 * only one long hold on the dataset. We're not allowed to change anything here 2181 * so we don't permanently release the long hold or regular hold here. We want 2182 * to do this only when syncing to avoid the dataset unexpectedly going away 2183 * when we release the long hold. 2184 */ 2185static int 2186dsl_dataset_handoff_check(dsl_dataset_t *ds, void *owner, dmu_tx_t *tx) 2187{ 2188 boolean_t held; 2189 2190 if (!dmu_tx_is_syncing(tx)) 2191 return (0); 2192 2193 if (owner != NULL) { 2194 VERIFY3P(ds->ds_owner, ==, owner); 2195 dsl_dataset_long_rele(ds, owner); 2196 } 2197 2198 held = dsl_dataset_long_held(ds); 2199 2200 if (owner != NULL) 2201 dsl_dataset_long_hold(ds, owner); 2202 2203 if (held) 2204 return (SET_ERROR(EBUSY)); 2205 2206 return (0); 2207} 2208 2209typedef struct dsl_dataset_rollback_arg { 2210 const char *ddra_fsname; 2211 void *ddra_owner; 2212 nvlist_t *ddra_result; 2213} dsl_dataset_rollback_arg_t; 2214 2215static int 2216dsl_dataset_rollback_check(void *arg, dmu_tx_t *tx) 2217{ 2218 dsl_dataset_rollback_arg_t *ddra = arg; 2219 dsl_pool_t *dp = dmu_tx_pool(tx); 2220 dsl_dataset_t *ds; 2221 int64_t unused_refres_delta; 2222 int error; 2223 2224 error = dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds); 2225 if (error != 0) 2226 return (error); 2227 2228 /* must not be a snapshot */ 2229 if (ds->ds_is_snapshot) { 2230 dsl_dataset_rele(ds, FTAG); 2231 return (SET_ERROR(EINVAL)); 2232 } 2233 2234 /* must have a most recent snapshot */ 2235 if (dsl_dataset_phys(ds)->ds_prev_snap_txg < TXG_INITIAL) { 2236 dsl_dataset_rele(ds, FTAG); 2237 return (SET_ERROR(EINVAL)); 2238 } 2239 2240 /* must not have any bookmarks after the most recent snapshot */ 2241 nvlist_t *proprequest = fnvlist_alloc(); 2242 fnvlist_add_boolean(proprequest, zfs_prop_to_name(ZFS_PROP_CREATETXG)); 2243 nvlist_t *bookmarks = fnvlist_alloc(); 2244 error = dsl_get_bookmarks_impl(ds, proprequest, bookmarks); 2245 fnvlist_free(proprequest); 2246 if (error != 0) 2247 return (error); 2248 for (nvpair_t *pair = nvlist_next_nvpair(bookmarks, NULL); 2249 pair != NULL; pair = nvlist_next_nvpair(bookmarks, pair)) { 2250 nvlist_t *valuenv = 2251 fnvlist_lookup_nvlist(fnvpair_value_nvlist(pair), 2252 zfs_prop_to_name(ZFS_PROP_CREATETXG)); 2253 uint64_t createtxg = fnvlist_lookup_uint64(valuenv, "value"); 2254 if (createtxg > dsl_dataset_phys(ds)->ds_prev_snap_txg) { 2255 fnvlist_free(bookmarks); 2256 dsl_dataset_rele(ds, FTAG); 2257 return (SET_ERROR(EEXIST)); 2258 } 2259 } 2260 fnvlist_free(bookmarks); 2261 2262 error = dsl_dataset_handoff_check(ds, ddra->ddra_owner, tx); 2263 if (error != 0) { 2264 dsl_dataset_rele(ds, FTAG); 2265 return (error); 2266 } 2267 2268 /* 2269 * Check if the snap we are rolling back to uses more than 2270 * the refquota. 2271 */ 2272 if (ds->ds_quota != 0 && 2273 dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes > ds->ds_quota) { 2274 dsl_dataset_rele(ds, FTAG); 2275 return (SET_ERROR(EDQUOT)); 2276 } 2277 2278 /* 2279 * When we do the clone swap, we will temporarily use more space 2280 * due to the refreservation (the head will no longer have any 2281 * unique space, so the entire amount of the refreservation will need 2282 * to be free). We will immediately destroy the clone, freeing 2283 * this space, but the freeing happens over many txg's. 2284 */ 2285 unused_refres_delta = (int64_t)MIN(ds->ds_reserved, 2286 dsl_dataset_phys(ds)->ds_unique_bytes); 2287 2288 if (unused_refres_delta > 0 && 2289 unused_refres_delta > 2290 dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) { 2291 dsl_dataset_rele(ds, FTAG); 2292 return (SET_ERROR(ENOSPC)); 2293 } 2294 2295 dsl_dataset_rele(ds, FTAG); 2296 return (0); 2297} 2298 2299static void 2300dsl_dataset_rollback_sync(void *arg, dmu_tx_t *tx) 2301{ 2302 dsl_dataset_rollback_arg_t *ddra = arg; 2303 dsl_pool_t *dp = dmu_tx_pool(tx); 2304 dsl_dataset_t *ds, *clone; 2305 uint64_t cloneobj; 2306 char namebuf[ZFS_MAX_DATASET_NAME_LEN]; 2307 2308 VERIFY0(dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds)); 2309 2310 dsl_dataset_name(ds->ds_prev, namebuf); 2311 fnvlist_add_string(ddra->ddra_result, "target", namebuf); 2312 2313 cloneobj = dsl_dataset_create_sync(ds->ds_dir, "%rollback", 2314 ds->ds_prev, DS_CREATE_FLAG_NODIRTY, kcred, tx); 2315 2316 VERIFY0(dsl_dataset_hold_obj(dp, cloneobj, FTAG, &clone)); 2317 2318 dsl_dataset_clone_swap_sync_impl(clone, ds, tx); 2319 dsl_dataset_zero_zil(ds, tx); 2320 2321 dsl_destroy_head_sync_impl(clone, tx); 2322 2323 dsl_dataset_rele(clone, FTAG); 2324 dsl_dataset_rele(ds, FTAG); 2325} 2326 2327/* 2328 * Rolls back the given filesystem or volume to the most recent snapshot. 2329 * The name of the most recent snapshot will be returned under key "target" 2330 * in the result nvlist. 2331 * 2332 * If owner != NULL: 2333 * - The existing dataset MUST be owned by the specified owner at entry 2334 * - Upon return, dataset will still be held by the same owner, whether we 2335 * succeed or not. 2336 * 2337 * This mode is required any time the existing filesystem is mounted. See 2338 * notes above zfs_suspend_fs() for further details. 2339 */ 2340int 2341dsl_dataset_rollback(const char *fsname, void *owner, nvlist_t *result) 2342{ 2343 dsl_dataset_rollback_arg_t ddra; 2344 2345 ddra.ddra_fsname = fsname; 2346 ddra.ddra_owner = owner; 2347 ddra.ddra_result = result; 2348 2349 return (dsl_sync_task(fsname, dsl_dataset_rollback_check, 2350 dsl_dataset_rollback_sync, &ddra, 2351 1, ZFS_SPACE_CHECK_RESERVED)); 2352} 2353 2354struct promotenode { 2355 list_node_t link; 2356 dsl_dataset_t *ds; 2357}; 2358 2359typedef struct dsl_dataset_promote_arg { 2360 const char *ddpa_clonename; 2361 dsl_dataset_t *ddpa_clone; 2362 list_t shared_snaps, origin_snaps, clone_snaps; 2363 dsl_dataset_t *origin_origin; /* origin of the origin */ 2364 uint64_t used, comp, uncomp, unique, cloneusedsnap, originusedsnap; 2365 char *err_ds; 2366 cred_t *cr; 2367} dsl_dataset_promote_arg_t; 2368 2369static int snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep); 2370static int promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, 2371 void *tag); 2372static void promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag); 2373 2374static int 2375dsl_dataset_promote_check(void *arg, dmu_tx_t *tx) 2376{ 2377 dsl_dataset_promote_arg_t *ddpa = arg; 2378 dsl_pool_t *dp = dmu_tx_pool(tx); 2379 dsl_dataset_t *hds; 2380 struct promotenode *snap; 2381 dsl_dataset_t *origin_ds; 2382 int err; 2383 uint64_t unused; 2384 uint64_t ss_mv_cnt; 2385 size_t max_snap_len; 2386 2387 err = promote_hold(ddpa, dp, FTAG); 2388 if (err != 0) 2389 return (err); 2390 2391 hds = ddpa->ddpa_clone; 2392 max_snap_len = MAXNAMELEN - strlen(ddpa->ddpa_clonename) - 1; 2393 2394 if (dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE) { 2395 promote_rele(ddpa, FTAG); 2396 return (SET_ERROR(EXDEV)); 2397 } 2398 2399 /* 2400 * Compute and check the amount of space to transfer. Since this is 2401 * so expensive, don't do the preliminary check. 2402 */ 2403 if (!dmu_tx_is_syncing(tx)) { 2404 promote_rele(ddpa, FTAG); 2405 return (0); 2406 } 2407 2408 snap = list_head(&ddpa->shared_snaps); 2409 origin_ds = snap->ds; 2410 2411 /* compute origin's new unique space */ 2412 snap = list_tail(&ddpa->clone_snaps); 2413 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==, 2414 origin_ds->ds_object); 2415 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 2416 dsl_dataset_phys(origin_ds)->ds_prev_snap_txg, UINT64_MAX, 2417 &ddpa->unique, &unused, &unused); 2418 2419 /* 2420 * Walk the snapshots that we are moving 2421 * 2422 * Compute space to transfer. Consider the incremental changes 2423 * to used by each snapshot: 2424 * (my used) = (prev's used) + (blocks born) - (blocks killed) 2425 * So each snapshot gave birth to: 2426 * (blocks born) = (my used) - (prev's used) + (blocks killed) 2427 * So a sequence would look like: 2428 * (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0) 2429 * Which simplifies to: 2430 * uN + kN + kN-1 + ... + k1 + k0 2431 * Note however, if we stop before we reach the ORIGIN we get: 2432 * uN + kN + kN-1 + ... + kM - uM-1 2433 */ 2434 ss_mv_cnt = 0; 2435 ddpa->used = dsl_dataset_phys(origin_ds)->ds_referenced_bytes; 2436 ddpa->comp = dsl_dataset_phys(origin_ds)->ds_compressed_bytes; 2437 ddpa->uncomp = dsl_dataset_phys(origin_ds)->ds_uncompressed_bytes; 2438 for (snap = list_head(&ddpa->shared_snaps); snap; 2439 snap = list_next(&ddpa->shared_snaps, snap)) { 2440 uint64_t val, dlused, dlcomp, dluncomp; 2441 dsl_dataset_t *ds = snap->ds; 2442 2443 ss_mv_cnt++; 2444 2445 /* 2446 * If there are long holds, we won't be able to evict 2447 * the objset. 2448 */ 2449 if (dsl_dataset_long_held(ds)) { 2450 err = SET_ERROR(EBUSY); 2451 goto out; 2452 } 2453 2454 /* Check that the snapshot name does not conflict */ 2455 VERIFY0(dsl_dataset_get_snapname(ds)); 2456 if (strlen(ds->ds_snapname) >= max_snap_len) { 2457 err = SET_ERROR(ENAMETOOLONG); 2458 goto out; 2459 } 2460 err = dsl_dataset_snap_lookup(hds, ds->ds_snapname, &val); 2461 if (err == 0) { 2462 (void) strcpy(ddpa->err_ds, snap->ds->ds_snapname); 2463 err = SET_ERROR(EEXIST); 2464 goto out; 2465 } 2466 if (err != ENOENT) 2467 goto out; 2468 2469 /* The very first snapshot does not have a deadlist */ 2470 if (dsl_dataset_phys(ds)->ds_prev_snap_obj == 0) 2471 continue; 2472 2473 dsl_deadlist_space(&ds->ds_deadlist, 2474 &dlused, &dlcomp, &dluncomp); 2475 ddpa->used += dlused; 2476 ddpa->comp += dlcomp; 2477 ddpa->uncomp += dluncomp; 2478 } 2479 2480 /* 2481 * If we are a clone of a clone then we never reached ORIGIN, 2482 * so we need to subtract out the clone origin's used space. 2483 */ 2484 if (ddpa->origin_origin) { 2485 ddpa->used -= 2486 dsl_dataset_phys(ddpa->origin_origin)->ds_referenced_bytes; 2487 ddpa->comp -= 2488 dsl_dataset_phys(ddpa->origin_origin)->ds_compressed_bytes; 2489 ddpa->uncomp -= 2490 dsl_dataset_phys(ddpa->origin_origin)-> 2491 ds_uncompressed_bytes; 2492 } 2493 2494 /* Check that there is enough space and limit headroom here */ 2495 err = dsl_dir_transfer_possible(origin_ds->ds_dir, hds->ds_dir, 2496 0, ss_mv_cnt, ddpa->used, ddpa->cr); 2497 if (err != 0) 2498 goto out; 2499 2500 /* 2501 * Compute the amounts of space that will be used by snapshots 2502 * after the promotion (for both origin and clone). For each, 2503 * it is the amount of space that will be on all of their 2504 * deadlists (that was not born before their new origin). 2505 */ 2506 if (dsl_dir_phys(hds->ds_dir)->dd_flags & DD_FLAG_USED_BREAKDOWN) { 2507 uint64_t space; 2508 2509 /* 2510 * Note, typically this will not be a clone of a clone, 2511 * so dd_origin_txg will be < TXG_INITIAL, so 2512 * these snaplist_space() -> dsl_deadlist_space_range() 2513 * calls will be fast because they do not have to 2514 * iterate over all bps. 2515 */ 2516 snap = list_head(&ddpa->origin_snaps); 2517 err = snaplist_space(&ddpa->shared_snaps, 2518 snap->ds->ds_dir->dd_origin_txg, &ddpa->cloneusedsnap); 2519 if (err != 0) 2520 goto out; 2521 2522 err = snaplist_space(&ddpa->clone_snaps, 2523 snap->ds->ds_dir->dd_origin_txg, &space); 2524 if (err != 0) 2525 goto out; 2526 ddpa->cloneusedsnap += space; 2527 } 2528 if (dsl_dir_phys(origin_ds->ds_dir)->dd_flags & 2529 DD_FLAG_USED_BREAKDOWN) { 2530 err = snaplist_space(&ddpa->origin_snaps, 2531 dsl_dataset_phys(origin_ds)->ds_creation_txg, 2532 &ddpa->originusedsnap); 2533 if (err != 0) 2534 goto out; 2535 } 2536 2537out: 2538 promote_rele(ddpa, FTAG); 2539 return (err); 2540} 2541 2542static void 2543dsl_dataset_promote_sync(void *arg, dmu_tx_t *tx) 2544{ 2545 dsl_dataset_promote_arg_t *ddpa = arg; 2546 dsl_pool_t *dp = dmu_tx_pool(tx); 2547 dsl_dataset_t *hds; 2548 struct promotenode *snap; 2549 dsl_dataset_t *origin_ds; 2550 dsl_dataset_t *origin_head; 2551 dsl_dir_t *dd; 2552 dsl_dir_t *odd = NULL; 2553 uint64_t oldnext_obj; 2554 int64_t delta; 2555#if defined(__FreeBSD__) && defined(_KERNEL) 2556 char *oldname, *newname; 2557#endif 2558 2559 VERIFY0(promote_hold(ddpa, dp, FTAG)); 2560 hds = ddpa->ddpa_clone; 2561 2562 ASSERT0(dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE); 2563 2564 snap = list_head(&ddpa->shared_snaps); 2565 origin_ds = snap->ds; 2566 dd = hds->ds_dir; 2567 2568 snap = list_head(&ddpa->origin_snaps); 2569 origin_head = snap->ds; 2570 2571 /* 2572 * We need to explicitly open odd, since origin_ds's dd will be 2573 * changing. 2574 */ 2575 VERIFY0(dsl_dir_hold_obj(dp, origin_ds->ds_dir->dd_object, 2576 NULL, FTAG, &odd)); 2577 2578 /* change origin's next snap */ 2579 dmu_buf_will_dirty(origin_ds->ds_dbuf, tx); 2580 oldnext_obj = dsl_dataset_phys(origin_ds)->ds_next_snap_obj; 2581 snap = list_tail(&ddpa->clone_snaps); 2582 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==, 2583 origin_ds->ds_object); 2584 dsl_dataset_phys(origin_ds)->ds_next_snap_obj = snap->ds->ds_object; 2585 2586 /* change the origin's next clone */ 2587 if (dsl_dataset_phys(origin_ds)->ds_next_clones_obj) { 2588 dsl_dataset_remove_from_next_clones(origin_ds, 2589 snap->ds->ds_object, tx); 2590 VERIFY0(zap_add_int(dp->dp_meta_objset, 2591 dsl_dataset_phys(origin_ds)->ds_next_clones_obj, 2592 oldnext_obj, tx)); 2593 } 2594 2595 /* change origin */ 2596 dmu_buf_will_dirty(dd->dd_dbuf, tx); 2597 ASSERT3U(dsl_dir_phys(dd)->dd_origin_obj, ==, origin_ds->ds_object); 2598 dsl_dir_phys(dd)->dd_origin_obj = dsl_dir_phys(odd)->dd_origin_obj; 2599 dd->dd_origin_txg = origin_head->ds_dir->dd_origin_txg; 2600 dmu_buf_will_dirty(odd->dd_dbuf, tx); 2601 dsl_dir_phys(odd)->dd_origin_obj = origin_ds->ds_object; 2602 origin_head->ds_dir->dd_origin_txg = 2603 dsl_dataset_phys(origin_ds)->ds_creation_txg; 2604 2605 /* change dd_clone entries */ 2606 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 2607 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2608 dsl_dir_phys(odd)->dd_clones, hds->ds_object, tx)); 2609 VERIFY0(zap_add_int(dp->dp_meta_objset, 2610 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones, 2611 hds->ds_object, tx)); 2612 2613 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2614 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones, 2615 origin_head->ds_object, tx)); 2616 if (dsl_dir_phys(dd)->dd_clones == 0) { 2617 dsl_dir_phys(dd)->dd_clones = 2618 zap_create(dp->dp_meta_objset, DMU_OT_DSL_CLONES, 2619 DMU_OT_NONE, 0, tx); 2620 } 2621 VERIFY0(zap_add_int(dp->dp_meta_objset, 2622 dsl_dir_phys(dd)->dd_clones, origin_head->ds_object, tx)); 2623 } 2624 2625#if defined(__FreeBSD__) && defined(_KERNEL) 2626 /* Take the spa_namespace_lock early so zvol renames don't deadlock. */ 2627 mutex_enter(&spa_namespace_lock); 2628 2629 oldname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 2630 newname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 2631#endif 2632 2633 /* move snapshots to this dir */ 2634 for (snap = list_head(&ddpa->shared_snaps); snap; 2635 snap = list_next(&ddpa->shared_snaps, snap)) { 2636 dsl_dataset_t *ds = snap->ds; 2637 2638 /* 2639 * Property callbacks are registered to a particular 2640 * dsl_dir. Since ours is changing, evict the objset 2641 * so that they will be unregistered from the old dsl_dir. 2642 */ 2643 if (ds->ds_objset) { 2644 dmu_objset_evict(ds->ds_objset); 2645 ds->ds_objset = NULL; 2646 } 2647 2648 /* move snap name entry */ 2649 VERIFY0(dsl_dataset_get_snapname(ds)); 2650 VERIFY0(dsl_dataset_snap_remove(origin_head, 2651 ds->ds_snapname, tx, B_TRUE)); 2652 VERIFY0(zap_add(dp->dp_meta_objset, 2653 dsl_dataset_phys(hds)->ds_snapnames_zapobj, ds->ds_snapname, 2654 8, 1, &ds->ds_object, tx)); 2655 dsl_fs_ss_count_adjust(hds->ds_dir, 1, 2656 DD_FIELD_SNAPSHOT_COUNT, tx); 2657 2658 /* change containing dsl_dir */ 2659 dmu_buf_will_dirty(ds->ds_dbuf, tx); 2660 ASSERT3U(dsl_dataset_phys(ds)->ds_dir_obj, ==, odd->dd_object); 2661 dsl_dataset_phys(ds)->ds_dir_obj = dd->dd_object; 2662 ASSERT3P(ds->ds_dir, ==, odd); 2663 dsl_dir_rele(ds->ds_dir, ds); 2664 VERIFY0(dsl_dir_hold_obj(dp, dd->dd_object, 2665 NULL, ds, &ds->ds_dir)); 2666 2667#if defined(__FreeBSD__) && defined(_KERNEL) 2668 dsl_dataset_name(ds, newname); 2669 zfsvfs_update_fromname(oldname, newname); 2670 zvol_rename_minors(oldname, newname); 2671#endif 2672 2673 /* move any clone references */ 2674 if (dsl_dataset_phys(ds)->ds_next_clones_obj && 2675 spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 2676 zap_cursor_t zc; 2677 zap_attribute_t za; 2678 2679 for (zap_cursor_init(&zc, dp->dp_meta_objset, 2680 dsl_dataset_phys(ds)->ds_next_clones_obj); 2681 zap_cursor_retrieve(&zc, &za) == 0; 2682 zap_cursor_advance(&zc)) { 2683 dsl_dataset_t *cnds; 2684 uint64_t o; 2685 2686 if (za.za_first_integer == oldnext_obj) { 2687 /* 2688 * We've already moved the 2689 * origin's reference. 2690 */ 2691 continue; 2692 } 2693 2694 VERIFY0(dsl_dataset_hold_obj(dp, 2695 za.za_first_integer, FTAG, &cnds)); 2696 o = dsl_dir_phys(cnds->ds_dir)-> 2697 dd_head_dataset_obj; 2698 2699 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2700 dsl_dir_phys(odd)->dd_clones, o, tx)); 2701 VERIFY0(zap_add_int(dp->dp_meta_objset, 2702 dsl_dir_phys(dd)->dd_clones, o, tx)); 2703 dsl_dataset_rele(cnds, FTAG); 2704 } 2705 zap_cursor_fini(&zc); 2706 } 2707 2708 ASSERT(!dsl_prop_hascb(ds)); 2709 } 2710 2711#if defined(__FreeBSD__) && defined(_KERNEL) 2712 mutex_exit(&spa_namespace_lock); 2713 2714 kmem_free(newname, MAXPATHLEN); 2715 kmem_free(oldname, MAXPATHLEN); 2716#endif 2717 /* 2718 * Change space accounting. 2719 * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either 2720 * both be valid, or both be 0 (resulting in delta == 0). This 2721 * is true for each of {clone,origin} independently. 2722 */ 2723 2724 delta = ddpa->cloneusedsnap - 2725 dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_SNAP]; 2726 ASSERT3S(delta, >=, 0); 2727 ASSERT3U(ddpa->used, >=, delta); 2728 dsl_dir_diduse_space(dd, DD_USED_SNAP, delta, 0, 0, tx); 2729 dsl_dir_diduse_space(dd, DD_USED_HEAD, 2730 ddpa->used - delta, ddpa->comp, ddpa->uncomp, tx); 2731 2732 delta = ddpa->originusedsnap - 2733 dsl_dir_phys(odd)->dd_used_breakdown[DD_USED_SNAP]; 2734 ASSERT3S(delta, <=, 0); 2735 ASSERT3U(ddpa->used, >=, -delta); 2736 dsl_dir_diduse_space(odd, DD_USED_SNAP, delta, 0, 0, tx); 2737 dsl_dir_diduse_space(odd, DD_USED_HEAD, 2738 -ddpa->used - delta, -ddpa->comp, -ddpa->uncomp, tx); 2739 2740 dsl_dataset_phys(origin_ds)->ds_unique_bytes = ddpa->unique; 2741 2742 /* log history record */ 2743 spa_history_log_internal_ds(hds, "promote", tx, ""); 2744 2745 dsl_dir_rele(odd, FTAG); 2746 promote_rele(ddpa, FTAG); 2747} 2748 2749/* 2750 * Make a list of dsl_dataset_t's for the snapshots between first_obj 2751 * (exclusive) and last_obj (inclusive). The list will be in reverse 2752 * order (last_obj will be the list_head()). If first_obj == 0, do all 2753 * snapshots back to this dataset's origin. 2754 */ 2755static int 2756snaplist_make(dsl_pool_t *dp, 2757 uint64_t first_obj, uint64_t last_obj, list_t *l, void *tag) 2758{ 2759 uint64_t obj = last_obj; 2760 2761 list_create(l, sizeof (struct promotenode), 2762 offsetof(struct promotenode, link)); 2763 2764 while (obj != first_obj) { 2765 dsl_dataset_t *ds; 2766 struct promotenode *snap; 2767 int err; 2768 2769 err = dsl_dataset_hold_obj(dp, obj, tag, &ds); 2770 ASSERT(err != ENOENT); 2771 if (err != 0) 2772 return (err); 2773 2774 if (first_obj == 0) 2775 first_obj = dsl_dir_phys(ds->ds_dir)->dd_origin_obj; 2776 2777 snap = kmem_alloc(sizeof (*snap), KM_SLEEP); 2778 snap->ds = ds; 2779 list_insert_tail(l, snap); 2780 obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 2781 } 2782 2783 return (0); 2784} 2785 2786static int 2787snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep) 2788{ 2789 struct promotenode *snap; 2790 2791 *spacep = 0; 2792 for (snap = list_head(l); snap; snap = list_next(l, snap)) { 2793 uint64_t used, comp, uncomp; 2794 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 2795 mintxg, UINT64_MAX, &used, &comp, &uncomp); 2796 *spacep += used; 2797 } 2798 return (0); 2799} 2800 2801static void 2802snaplist_destroy(list_t *l, void *tag) 2803{ 2804 struct promotenode *snap; 2805 2806 if (l == NULL || !list_link_active(&l->list_head)) 2807 return; 2808 2809 while ((snap = list_tail(l)) != NULL) { 2810 list_remove(l, snap); 2811 dsl_dataset_rele(snap->ds, tag); 2812 kmem_free(snap, sizeof (*snap)); 2813 } 2814 list_destroy(l); 2815} 2816 2817static int 2818promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, void *tag) 2819{ 2820 int error; 2821 dsl_dir_t *dd; 2822 struct promotenode *snap; 2823 2824 error = dsl_dataset_hold(dp, ddpa->ddpa_clonename, tag, 2825 &ddpa->ddpa_clone); 2826 if (error != 0) 2827 return (error); 2828 dd = ddpa->ddpa_clone->ds_dir; 2829 2830 if (ddpa->ddpa_clone->ds_is_snapshot || 2831 !dsl_dir_is_clone(dd)) { 2832 dsl_dataset_rele(ddpa->ddpa_clone, tag); 2833 return (SET_ERROR(EINVAL)); 2834 } 2835 2836 error = snaplist_make(dp, 0, dsl_dir_phys(dd)->dd_origin_obj, 2837 &ddpa->shared_snaps, tag); 2838 if (error != 0) 2839 goto out; 2840 2841 error = snaplist_make(dp, 0, ddpa->ddpa_clone->ds_object, 2842 &ddpa->clone_snaps, tag); 2843 if (error != 0) 2844 goto out; 2845 2846 snap = list_head(&ddpa->shared_snaps); 2847 ASSERT3U(snap->ds->ds_object, ==, dsl_dir_phys(dd)->dd_origin_obj); 2848 error = snaplist_make(dp, dsl_dir_phys(dd)->dd_origin_obj, 2849 dsl_dir_phys(snap->ds->ds_dir)->dd_head_dataset_obj, 2850 &ddpa->origin_snaps, tag); 2851 if (error != 0) 2852 goto out; 2853 2854 if (dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj != 0) { 2855 error = dsl_dataset_hold_obj(dp, 2856 dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj, 2857 tag, &ddpa->origin_origin); 2858 if (error != 0) 2859 goto out; 2860 } 2861out: 2862 if (error != 0) 2863 promote_rele(ddpa, tag); 2864 return (error); 2865} 2866 2867static void 2868promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag) 2869{ 2870 snaplist_destroy(&ddpa->shared_snaps, tag); 2871 snaplist_destroy(&ddpa->clone_snaps, tag); 2872 snaplist_destroy(&ddpa->origin_snaps, tag); 2873 if (ddpa->origin_origin != NULL) 2874 dsl_dataset_rele(ddpa->origin_origin, tag); 2875 dsl_dataset_rele(ddpa->ddpa_clone, tag); 2876} 2877 2878/* 2879 * Promote a clone. 2880 * 2881 * If it fails due to a conflicting snapshot name, "conflsnap" will be filled 2882 * in with the name. (It must be at least ZFS_MAX_DATASET_NAME_LEN bytes long.) 2883 */ 2884int 2885dsl_dataset_promote(const char *name, char *conflsnap) 2886{ 2887 dsl_dataset_promote_arg_t ddpa = { 0 }; 2888 uint64_t numsnaps; 2889 int error; 2890 objset_t *os; 2891 2892 /* 2893 * We will modify space proportional to the number of 2894 * snapshots. Compute numsnaps. 2895 */ 2896 error = dmu_objset_hold(name, FTAG, &os); 2897 if (error != 0) 2898 return (error); 2899 error = zap_count(dmu_objset_pool(os)->dp_meta_objset, 2900 dsl_dataset_phys(dmu_objset_ds(os))->ds_snapnames_zapobj, 2901 &numsnaps); 2902 dmu_objset_rele(os, FTAG); 2903 if (error != 0) 2904 return (error); 2905 2906 ddpa.ddpa_clonename = name; 2907 ddpa.err_ds = conflsnap; 2908 ddpa.cr = CRED(); 2909 2910 return (dsl_sync_task(name, dsl_dataset_promote_check, 2911 dsl_dataset_promote_sync, &ddpa, 2912 2 + numsnaps, ZFS_SPACE_CHECK_RESERVED)); 2913} 2914 2915int 2916dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone, 2917 dsl_dataset_t *origin_head, boolean_t force, void *owner, dmu_tx_t *tx) 2918{ 2919 /* 2920 * "slack" factor for received datasets with refquota set on them. 2921 * See the bottom of this function for details on its use. 2922 */ 2923 uint64_t refquota_slack = DMU_MAX_ACCESS * spa_asize_inflation; 2924 int64_t unused_refres_delta; 2925 2926 /* they should both be heads */ 2927 if (clone->ds_is_snapshot || 2928 origin_head->ds_is_snapshot) 2929 return (SET_ERROR(EINVAL)); 2930 2931 /* if we are not forcing, the branch point should be just before them */ 2932 if (!force && clone->ds_prev != origin_head->ds_prev) 2933 return (SET_ERROR(EINVAL)); 2934 2935 /* clone should be the clone (unless they are unrelated) */ 2936 if (clone->ds_prev != NULL && 2937 clone->ds_prev != clone->ds_dir->dd_pool->dp_origin_snap && 2938 origin_head->ds_dir != clone->ds_prev->ds_dir) 2939 return (SET_ERROR(EINVAL)); 2940 2941 /* the clone should be a child of the origin */ 2942 if (clone->ds_dir->dd_parent != origin_head->ds_dir) 2943 return (SET_ERROR(EINVAL)); 2944 2945 /* origin_head shouldn't be modified unless 'force' */ 2946 if (!force && 2947 dsl_dataset_modified_since_snap(origin_head, origin_head->ds_prev)) 2948 return (SET_ERROR(ETXTBSY)); 2949 2950 /* origin_head should have no long holds (e.g. is not mounted) */ 2951 if (dsl_dataset_handoff_check(origin_head, owner, tx)) 2952 return (SET_ERROR(EBUSY)); 2953 2954 /* check amount of any unconsumed refreservation */ 2955 unused_refres_delta = 2956 (int64_t)MIN(origin_head->ds_reserved, 2957 dsl_dataset_phys(origin_head)->ds_unique_bytes) - 2958 (int64_t)MIN(origin_head->ds_reserved, 2959 dsl_dataset_phys(clone)->ds_unique_bytes); 2960 2961 if (unused_refres_delta > 0 && 2962 unused_refres_delta > 2963 dsl_dir_space_available(origin_head->ds_dir, NULL, 0, TRUE)) 2964 return (SET_ERROR(ENOSPC)); 2965 2966 /* 2967 * The clone can't be too much over the head's refquota. 2968 * 2969 * To ensure that the entire refquota can be used, we allow one 2970 * transaction to exceed the the refquota. Therefore, this check 2971 * needs to also allow for the space referenced to be more than the 2972 * refquota. The maximum amount of space that one transaction can use 2973 * on disk is DMU_MAX_ACCESS * spa_asize_inflation. Allowing this 2974 * overage ensures that we are able to receive a filesystem that 2975 * exceeds the refquota on the source system. 2976 * 2977 * So that overage is the refquota_slack we use below. 2978 */ 2979 if (origin_head->ds_quota != 0 && 2980 dsl_dataset_phys(clone)->ds_referenced_bytes > 2981 origin_head->ds_quota + refquota_slack) 2982 return (SET_ERROR(EDQUOT)); 2983 2984 return (0); 2985} 2986 2987void 2988dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone, 2989 dsl_dataset_t *origin_head, dmu_tx_t *tx) 2990{ 2991 dsl_pool_t *dp = dmu_tx_pool(tx); 2992 int64_t unused_refres_delta; 2993 2994 ASSERT(clone->ds_reserved == 0); 2995 /* 2996 * NOTE: On DEBUG kernels there could be a race between this and 2997 * the check function if spa_asize_inflation is adjusted... 2998 */ 2999 ASSERT(origin_head->ds_quota == 0 || 3000 dsl_dataset_phys(clone)->ds_unique_bytes <= origin_head->ds_quota + 3001 DMU_MAX_ACCESS * spa_asize_inflation); 3002 ASSERT3P(clone->ds_prev, ==, origin_head->ds_prev); 3003 3004 /* 3005 * Swap per-dataset feature flags. 3006 */ 3007 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 3008 if (!(spa_feature_table[f].fi_flags & 3009 ZFEATURE_FLAG_PER_DATASET)) { 3010 ASSERT(!clone->ds_feature_inuse[f]); 3011 ASSERT(!origin_head->ds_feature_inuse[f]); 3012 continue; 3013 } 3014 3015 boolean_t clone_inuse = clone->ds_feature_inuse[f]; 3016 boolean_t origin_head_inuse = origin_head->ds_feature_inuse[f]; 3017 3018 if (clone_inuse) { 3019 dsl_dataset_deactivate_feature(clone->ds_object, f, tx); 3020 clone->ds_feature_inuse[f] = B_FALSE; 3021 } 3022 if (origin_head_inuse) { 3023 dsl_dataset_deactivate_feature(origin_head->ds_object, 3024 f, tx); 3025 origin_head->ds_feature_inuse[f] = B_FALSE; 3026 } 3027 if (clone_inuse) { 3028 dsl_dataset_activate_feature(origin_head->ds_object, 3029 f, tx); 3030 origin_head->ds_feature_inuse[f] = B_TRUE; 3031 } 3032 if (origin_head_inuse) { 3033 dsl_dataset_activate_feature(clone->ds_object, f, tx); 3034 clone->ds_feature_inuse[f] = B_TRUE; 3035 } 3036 } 3037 3038 dmu_buf_will_dirty(clone->ds_dbuf, tx); 3039 dmu_buf_will_dirty(origin_head->ds_dbuf, tx); 3040 3041 if (clone->ds_objset != NULL) { 3042 dmu_objset_evict(clone->ds_objset); 3043 clone->ds_objset = NULL; 3044 } 3045 3046 if (origin_head->ds_objset != NULL) { 3047 dmu_objset_evict(origin_head->ds_objset); 3048 origin_head->ds_objset = NULL; 3049 } 3050 3051 unused_refres_delta = 3052 (int64_t)MIN(origin_head->ds_reserved, 3053 dsl_dataset_phys(origin_head)->ds_unique_bytes) - 3054 (int64_t)MIN(origin_head->ds_reserved, 3055 dsl_dataset_phys(clone)->ds_unique_bytes); 3056 3057 /* 3058 * Reset origin's unique bytes, if it exists. 3059 */ 3060 if (clone->ds_prev) { 3061 dsl_dataset_t *origin = clone->ds_prev; 3062 uint64_t comp, uncomp; 3063 3064 dmu_buf_will_dirty(origin->ds_dbuf, tx); 3065 dsl_deadlist_space_range(&clone->ds_deadlist, 3066 dsl_dataset_phys(origin)->ds_prev_snap_txg, UINT64_MAX, 3067 &dsl_dataset_phys(origin)->ds_unique_bytes, &comp, &uncomp); 3068 } 3069 3070 /* swap blkptrs */ 3071 { 3072 rrw_enter(&clone->ds_bp_rwlock, RW_WRITER, FTAG); 3073 rrw_enter(&origin_head->ds_bp_rwlock, RW_WRITER, FTAG); 3074 blkptr_t tmp; 3075 tmp = dsl_dataset_phys(origin_head)->ds_bp; 3076 dsl_dataset_phys(origin_head)->ds_bp = 3077 dsl_dataset_phys(clone)->ds_bp; 3078 dsl_dataset_phys(clone)->ds_bp = tmp; 3079 rrw_exit(&origin_head->ds_bp_rwlock, FTAG); 3080 rrw_exit(&clone->ds_bp_rwlock, FTAG); 3081 } 3082 3083 /* set dd_*_bytes */ 3084 { 3085 int64_t dused, dcomp, duncomp; 3086 uint64_t cdl_used, cdl_comp, cdl_uncomp; 3087 uint64_t odl_used, odl_comp, odl_uncomp; 3088 3089 ASSERT3U(dsl_dir_phys(clone->ds_dir)-> 3090 dd_used_breakdown[DD_USED_SNAP], ==, 0); 3091 3092 dsl_deadlist_space(&clone->ds_deadlist, 3093 &cdl_used, &cdl_comp, &cdl_uncomp); 3094 dsl_deadlist_space(&origin_head->ds_deadlist, 3095 &odl_used, &odl_comp, &odl_uncomp); 3096 3097 dused = dsl_dataset_phys(clone)->ds_referenced_bytes + 3098 cdl_used - 3099 (dsl_dataset_phys(origin_head)->ds_referenced_bytes + 3100 odl_used); 3101 dcomp = dsl_dataset_phys(clone)->ds_compressed_bytes + 3102 cdl_comp - 3103 (dsl_dataset_phys(origin_head)->ds_compressed_bytes + 3104 odl_comp); 3105 duncomp = dsl_dataset_phys(clone)->ds_uncompressed_bytes + 3106 cdl_uncomp - 3107 (dsl_dataset_phys(origin_head)->ds_uncompressed_bytes + 3108 odl_uncomp); 3109 3110 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_HEAD, 3111 dused, dcomp, duncomp, tx); 3112 dsl_dir_diduse_space(clone->ds_dir, DD_USED_HEAD, 3113 -dused, -dcomp, -duncomp, tx); 3114 3115 /* 3116 * The difference in the space used by snapshots is the 3117 * difference in snapshot space due to the head's 3118 * deadlist (since that's the only thing that's 3119 * changing that affects the snapused). 3120 */ 3121 dsl_deadlist_space_range(&clone->ds_deadlist, 3122 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 3123 &cdl_used, &cdl_comp, &cdl_uncomp); 3124 dsl_deadlist_space_range(&origin_head->ds_deadlist, 3125 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 3126 &odl_used, &odl_comp, &odl_uncomp); 3127 dsl_dir_transfer_space(origin_head->ds_dir, cdl_used - odl_used, 3128 DD_USED_HEAD, DD_USED_SNAP, NULL); 3129 } 3130 3131 /* swap ds_*_bytes */ 3132 SWITCH64(dsl_dataset_phys(origin_head)->ds_referenced_bytes, 3133 dsl_dataset_phys(clone)->ds_referenced_bytes); 3134 SWITCH64(dsl_dataset_phys(origin_head)->ds_compressed_bytes, 3135 dsl_dataset_phys(clone)->ds_compressed_bytes); 3136 SWITCH64(dsl_dataset_phys(origin_head)->ds_uncompressed_bytes, 3137 dsl_dataset_phys(clone)->ds_uncompressed_bytes); 3138 SWITCH64(dsl_dataset_phys(origin_head)->ds_unique_bytes, 3139 dsl_dataset_phys(clone)->ds_unique_bytes); 3140 3141 /* apply any parent delta for change in unconsumed refreservation */ 3142 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_REFRSRV, 3143 unused_refres_delta, 0, 0, tx); 3144 3145 /* 3146 * Swap deadlists. 3147 */ 3148 dsl_deadlist_close(&clone->ds_deadlist); 3149 dsl_deadlist_close(&origin_head->ds_deadlist); 3150 SWITCH64(dsl_dataset_phys(origin_head)->ds_deadlist_obj, 3151 dsl_dataset_phys(clone)->ds_deadlist_obj); 3152 dsl_deadlist_open(&clone->ds_deadlist, dp->dp_meta_objset, 3153 dsl_dataset_phys(clone)->ds_deadlist_obj); 3154 dsl_deadlist_open(&origin_head->ds_deadlist, dp->dp_meta_objset, 3155 dsl_dataset_phys(origin_head)->ds_deadlist_obj); 3156 3157 dsl_scan_ds_clone_swapped(origin_head, clone, tx); 3158 3159 spa_history_log_internal_ds(clone, "clone swap", tx, 3160 "parent=%s", origin_head->ds_dir->dd_myname); 3161} 3162 3163/* 3164 * Given a pool name and a dataset object number in that pool, 3165 * return the name of that dataset. 3166 */ 3167int 3168dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf) 3169{ 3170 dsl_pool_t *dp; 3171 dsl_dataset_t *ds; 3172 int error; 3173 3174 error = dsl_pool_hold(pname, FTAG, &dp); 3175 if (error != 0) 3176 return (error); 3177 3178 error = dsl_dataset_hold_obj(dp, obj, FTAG, &ds); 3179 if (error == 0) { 3180 dsl_dataset_name(ds, buf); 3181 dsl_dataset_rele(ds, FTAG); 3182 } 3183 dsl_pool_rele(dp, FTAG); 3184 3185 return (error); 3186} 3187 3188int 3189dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota, 3190 uint64_t asize, uint64_t inflight, uint64_t *used, uint64_t *ref_rsrv) 3191{ 3192 int error = 0; 3193 3194 ASSERT3S(asize, >, 0); 3195 3196 /* 3197 * *ref_rsrv is the portion of asize that will come from any 3198 * unconsumed refreservation space. 3199 */ 3200 *ref_rsrv = 0; 3201 3202 mutex_enter(&ds->ds_lock); 3203 /* 3204 * Make a space adjustment for reserved bytes. 3205 */ 3206 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) { 3207 ASSERT3U(*used, >=, 3208 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes); 3209 *used -= 3210 (ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes); 3211 *ref_rsrv = 3212 asize - MIN(asize, parent_delta(ds, asize + inflight)); 3213 } 3214 3215 if (!check_quota || ds->ds_quota == 0) { 3216 mutex_exit(&ds->ds_lock); 3217 return (0); 3218 } 3219 /* 3220 * If they are requesting more space, and our current estimate 3221 * is over quota, they get to try again unless the actual 3222 * on-disk is over quota and there are no pending changes (which 3223 * may free up space for us). 3224 */ 3225 if (dsl_dataset_phys(ds)->ds_referenced_bytes + inflight >= 3226 ds->ds_quota) { 3227 if (inflight > 0 || 3228 dsl_dataset_phys(ds)->ds_referenced_bytes < ds->ds_quota) 3229 error = SET_ERROR(ERESTART); 3230 else 3231 error = SET_ERROR(EDQUOT); 3232 } 3233 mutex_exit(&ds->ds_lock); 3234 3235 return (error); 3236} 3237 3238typedef struct dsl_dataset_set_qr_arg { 3239 const char *ddsqra_name; 3240 zprop_source_t ddsqra_source; 3241 uint64_t ddsqra_value; 3242} dsl_dataset_set_qr_arg_t; 3243 3244 3245/* ARGSUSED */ 3246static int 3247dsl_dataset_set_refquota_check(void *arg, dmu_tx_t *tx) 3248{ 3249 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3250 dsl_pool_t *dp = dmu_tx_pool(tx); 3251 dsl_dataset_t *ds; 3252 int error; 3253 uint64_t newval; 3254 3255 if (spa_version(dp->dp_spa) < SPA_VERSION_REFQUOTA) 3256 return (SET_ERROR(ENOTSUP)); 3257 3258 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 3259 if (error != 0) 3260 return (error); 3261 3262 if (ds->ds_is_snapshot) { 3263 dsl_dataset_rele(ds, FTAG); 3264 return (SET_ERROR(EINVAL)); 3265 } 3266 3267 error = dsl_prop_predict(ds->ds_dir, 3268 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 3269 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 3270 if (error != 0) { 3271 dsl_dataset_rele(ds, FTAG); 3272 return (error); 3273 } 3274 3275 if (newval == 0) { 3276 dsl_dataset_rele(ds, FTAG); 3277 return (0); 3278 } 3279 3280 if (newval < dsl_dataset_phys(ds)->ds_referenced_bytes || 3281 newval < ds->ds_reserved) { 3282 dsl_dataset_rele(ds, FTAG); 3283 return (SET_ERROR(ENOSPC)); 3284 } 3285 3286 dsl_dataset_rele(ds, FTAG); 3287 return (0); 3288} 3289 3290static void 3291dsl_dataset_set_refquota_sync(void *arg, dmu_tx_t *tx) 3292{ 3293 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3294 dsl_pool_t *dp = dmu_tx_pool(tx); 3295 dsl_dataset_t *ds; 3296 uint64_t newval; 3297 3298 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 3299 3300 dsl_prop_set_sync_impl(ds, 3301 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 3302 ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1, 3303 &ddsqra->ddsqra_value, tx); 3304 3305 VERIFY0(dsl_prop_get_int_ds(ds, 3306 zfs_prop_to_name(ZFS_PROP_REFQUOTA), &newval)); 3307 3308 if (ds->ds_quota != newval) { 3309 dmu_buf_will_dirty(ds->ds_dbuf, tx); 3310 ds->ds_quota = newval; 3311 } 3312 dsl_dataset_rele(ds, FTAG); 3313} 3314 3315int 3316dsl_dataset_set_refquota(const char *dsname, zprop_source_t source, 3317 uint64_t refquota) 3318{ 3319 dsl_dataset_set_qr_arg_t ddsqra; 3320 3321 ddsqra.ddsqra_name = dsname; 3322 ddsqra.ddsqra_source = source; 3323 ddsqra.ddsqra_value = refquota; 3324 3325 return (dsl_sync_task(dsname, dsl_dataset_set_refquota_check, 3326 dsl_dataset_set_refquota_sync, &ddsqra, 0, ZFS_SPACE_CHECK_NONE)); 3327} 3328 3329static int 3330dsl_dataset_set_refreservation_check(void *arg, dmu_tx_t *tx) 3331{ 3332 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3333 dsl_pool_t *dp = dmu_tx_pool(tx); 3334 dsl_dataset_t *ds; 3335 int error; 3336 uint64_t newval, unique; 3337 3338 if (spa_version(dp->dp_spa) < SPA_VERSION_REFRESERVATION) 3339 return (SET_ERROR(ENOTSUP)); 3340 3341 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 3342 if (error != 0) 3343 return (error); 3344 3345 if (ds->ds_is_snapshot) { 3346 dsl_dataset_rele(ds, FTAG); 3347 return (SET_ERROR(EINVAL)); 3348 } 3349 3350 error = dsl_prop_predict(ds->ds_dir, 3351 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 3352 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 3353 if (error != 0) { 3354 dsl_dataset_rele(ds, FTAG); 3355 return (error); 3356 } 3357 3358 /* 3359 * If we are doing the preliminary check in open context, the 3360 * space estimates may be inaccurate. 3361 */ 3362 if (!dmu_tx_is_syncing(tx)) { 3363 dsl_dataset_rele(ds, FTAG); 3364 return (0); 3365 } 3366 3367 mutex_enter(&ds->ds_lock); 3368 if (!DS_UNIQUE_IS_ACCURATE(ds)) 3369 dsl_dataset_recalc_head_uniq(ds); 3370 unique = dsl_dataset_phys(ds)->ds_unique_bytes; 3371 mutex_exit(&ds->ds_lock); 3372 3373 if (MAX(unique, newval) > MAX(unique, ds->ds_reserved)) { 3374 uint64_t delta = MAX(unique, newval) - 3375 MAX(unique, ds->ds_reserved); 3376 3377 if (delta > 3378 dsl_dir_space_available(ds->ds_dir, NULL, 0, B_TRUE) || 3379 (ds->ds_quota > 0 && newval > ds->ds_quota)) { 3380 dsl_dataset_rele(ds, FTAG); 3381 return (SET_ERROR(ENOSPC)); 3382 } 3383 } 3384 3385 dsl_dataset_rele(ds, FTAG); 3386 return (0); 3387} 3388 3389void 3390dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds, 3391 zprop_source_t source, uint64_t value, dmu_tx_t *tx) 3392{ 3393 uint64_t newval; 3394 uint64_t unique; 3395 int64_t delta; 3396 3397 dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 3398 source, sizeof (value), 1, &value, tx); 3399 3400 VERIFY0(dsl_prop_get_int_ds(ds, 3401 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &newval)); 3402 3403 dmu_buf_will_dirty(ds->ds_dbuf, tx); 3404 mutex_enter(&ds->ds_dir->dd_lock); 3405 mutex_enter(&ds->ds_lock); 3406 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 3407 unique = dsl_dataset_phys(ds)->ds_unique_bytes; 3408 delta = MAX(0, (int64_t)(newval - unique)) - 3409 MAX(0, (int64_t)(ds->ds_reserved - unique)); 3410 ds->ds_reserved = newval; 3411 mutex_exit(&ds->ds_lock); 3412 3413 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, delta, 0, 0, tx); 3414 mutex_exit(&ds->ds_dir->dd_lock); 3415} 3416 3417static void 3418dsl_dataset_set_refreservation_sync(void *arg, dmu_tx_t *tx) 3419{ 3420 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3421 dsl_pool_t *dp = dmu_tx_pool(tx); 3422 dsl_dataset_t *ds; 3423 3424 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 3425 dsl_dataset_set_refreservation_sync_impl(ds, 3426 ddsqra->ddsqra_source, ddsqra->ddsqra_value, tx); 3427 dsl_dataset_rele(ds, FTAG); 3428} 3429 3430int 3431dsl_dataset_set_refreservation(const char *dsname, zprop_source_t source, 3432 uint64_t refreservation) 3433{ 3434 dsl_dataset_set_qr_arg_t ddsqra; 3435 3436 ddsqra.ddsqra_name = dsname; 3437 ddsqra.ddsqra_source = source; 3438 ddsqra.ddsqra_value = refreservation; 3439 3440 return (dsl_sync_task(dsname, dsl_dataset_set_refreservation_check, 3441 dsl_dataset_set_refreservation_sync, &ddsqra, 3442 0, ZFS_SPACE_CHECK_NONE)); 3443} 3444 3445/* 3446 * Return (in *usedp) the amount of space written in new that is not 3447 * present in oldsnap. New may be a snapshot or the head. Old must be 3448 * a snapshot before new, in new's filesystem (or its origin). If not then 3449 * fail and return EINVAL. 3450 * 3451 * The written space is calculated by considering two components: First, we 3452 * ignore any freed space, and calculate the written as new's used space 3453 * minus old's used space. Next, we add in the amount of space that was freed 3454 * between the two snapshots, thus reducing new's used space relative to old's. 3455 * Specifically, this is the space that was born before old->ds_creation_txg, 3456 * and freed before new (ie. on new's deadlist or a previous deadlist). 3457 * 3458 * space freed [---------------------] 3459 * snapshots ---O-------O--------O-------O------ 3460 * oldsnap new 3461 */ 3462int 3463dsl_dataset_space_written(dsl_dataset_t *oldsnap, dsl_dataset_t *new, 3464 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 3465{ 3466 int err = 0; 3467 uint64_t snapobj; 3468 dsl_pool_t *dp = new->ds_dir->dd_pool; 3469 3470 ASSERT(dsl_pool_config_held(dp)); 3471 3472 *usedp = 0; 3473 *usedp += dsl_dataset_phys(new)->ds_referenced_bytes; 3474 *usedp -= dsl_dataset_phys(oldsnap)->ds_referenced_bytes; 3475 3476 *compp = 0; 3477 *compp += dsl_dataset_phys(new)->ds_compressed_bytes; 3478 *compp -= dsl_dataset_phys(oldsnap)->ds_compressed_bytes; 3479 3480 *uncompp = 0; 3481 *uncompp += dsl_dataset_phys(new)->ds_uncompressed_bytes; 3482 *uncompp -= dsl_dataset_phys(oldsnap)->ds_uncompressed_bytes; 3483 3484 snapobj = new->ds_object; 3485 while (snapobj != oldsnap->ds_object) { 3486 dsl_dataset_t *snap; 3487 uint64_t used, comp, uncomp; 3488 3489 if (snapobj == new->ds_object) { 3490 snap = new; 3491 } else { 3492 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &snap); 3493 if (err != 0) 3494 break; 3495 } 3496 3497 if (dsl_dataset_phys(snap)->ds_prev_snap_txg == 3498 dsl_dataset_phys(oldsnap)->ds_creation_txg) { 3499 /* 3500 * The blocks in the deadlist can not be born after 3501 * ds_prev_snap_txg, so get the whole deadlist space, 3502 * which is more efficient (especially for old-format 3503 * deadlists). Unfortunately the deadlist code 3504 * doesn't have enough information to make this 3505 * optimization itself. 3506 */ 3507 dsl_deadlist_space(&snap->ds_deadlist, 3508 &used, &comp, &uncomp); 3509 } else { 3510 dsl_deadlist_space_range(&snap->ds_deadlist, 3511 0, dsl_dataset_phys(oldsnap)->ds_creation_txg, 3512 &used, &comp, &uncomp); 3513 } 3514 *usedp += used; 3515 *compp += comp; 3516 *uncompp += uncomp; 3517 3518 /* 3519 * If we get to the beginning of the chain of snapshots 3520 * (ds_prev_snap_obj == 0) before oldsnap, then oldsnap 3521 * was not a snapshot of/before new. 3522 */ 3523 snapobj = dsl_dataset_phys(snap)->ds_prev_snap_obj; 3524 if (snap != new) 3525 dsl_dataset_rele(snap, FTAG); 3526 if (snapobj == 0) { 3527 err = SET_ERROR(EINVAL); 3528 break; 3529 } 3530 3531 } 3532 return (err); 3533} 3534 3535/* 3536 * Return (in *usedp) the amount of space that will be reclaimed if firstsnap, 3537 * lastsnap, and all snapshots in between are deleted. 3538 * 3539 * blocks that would be freed [---------------------------] 3540 * snapshots ---O-------O--------O-------O--------O 3541 * firstsnap lastsnap 3542 * 3543 * This is the set of blocks that were born after the snap before firstsnap, 3544 * (birth > firstsnap->prev_snap_txg) and died before the snap after the 3545 * last snap (ie, is on lastsnap->ds_next->ds_deadlist or an earlier deadlist). 3546 * We calculate this by iterating over the relevant deadlists (from the snap 3547 * after lastsnap, backward to the snap after firstsnap), summing up the 3548 * space on the deadlist that was born after the snap before firstsnap. 3549 */ 3550int 3551dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap, 3552 dsl_dataset_t *lastsnap, 3553 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 3554{ 3555 int err = 0; 3556 uint64_t snapobj; 3557 dsl_pool_t *dp = firstsnap->ds_dir->dd_pool; 3558 3559 ASSERT(firstsnap->ds_is_snapshot); 3560 ASSERT(lastsnap->ds_is_snapshot); 3561 3562 /* 3563 * Check that the snapshots are in the same dsl_dir, and firstsnap 3564 * is before lastsnap. 3565 */ 3566 if (firstsnap->ds_dir != lastsnap->ds_dir || 3567 dsl_dataset_phys(firstsnap)->ds_creation_txg > 3568 dsl_dataset_phys(lastsnap)->ds_creation_txg) 3569 return (SET_ERROR(EINVAL)); 3570 3571 *usedp = *compp = *uncompp = 0; 3572 3573 snapobj = dsl_dataset_phys(lastsnap)->ds_next_snap_obj; 3574 while (snapobj != firstsnap->ds_object) { 3575 dsl_dataset_t *ds; 3576 uint64_t used, comp, uncomp; 3577 3578 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &ds); 3579 if (err != 0) 3580 break; 3581 3582 dsl_deadlist_space_range(&ds->ds_deadlist, 3583 dsl_dataset_phys(firstsnap)->ds_prev_snap_txg, UINT64_MAX, 3584 &used, &comp, &uncomp); 3585 *usedp += used; 3586 *compp += comp; 3587 *uncompp += uncomp; 3588 3589 snapobj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 3590 ASSERT3U(snapobj, !=, 0); 3591 dsl_dataset_rele(ds, FTAG); 3592 } 3593 return (err); 3594} 3595 3596/* 3597 * Return TRUE if 'earlier' is an earlier snapshot in 'later's timeline. 3598 * For example, they could both be snapshots of the same filesystem, and 3599 * 'earlier' is before 'later'. Or 'earlier' could be the origin of 3600 * 'later's filesystem. Or 'earlier' could be an older snapshot in the origin's 3601 * filesystem. Or 'earlier' could be the origin's origin. 3602 * 3603 * If non-zero, earlier_txg is used instead of earlier's ds_creation_txg. 3604 */ 3605boolean_t 3606dsl_dataset_is_before(dsl_dataset_t *later, dsl_dataset_t *earlier, 3607 uint64_t earlier_txg) 3608{ 3609 dsl_pool_t *dp = later->ds_dir->dd_pool; 3610 int error; 3611 boolean_t ret; 3612 3613 ASSERT(dsl_pool_config_held(dp)); 3614 ASSERT(earlier->ds_is_snapshot || earlier_txg != 0); 3615 3616 if (earlier_txg == 0) 3617 earlier_txg = dsl_dataset_phys(earlier)->ds_creation_txg; 3618 3619 if (later->ds_is_snapshot && 3620 earlier_txg >= dsl_dataset_phys(later)->ds_creation_txg) 3621 return (B_FALSE); 3622 3623 if (later->ds_dir == earlier->ds_dir) 3624 return (B_TRUE); 3625 if (!dsl_dir_is_clone(later->ds_dir)) 3626 return (B_FALSE); 3627 3628 if (dsl_dir_phys(later->ds_dir)->dd_origin_obj == earlier->ds_object) 3629 return (B_TRUE); 3630 dsl_dataset_t *origin; 3631 error = dsl_dataset_hold_obj(dp, 3632 dsl_dir_phys(later->ds_dir)->dd_origin_obj, FTAG, &origin); 3633 if (error != 0) 3634 return (B_FALSE); 3635 ret = dsl_dataset_is_before(origin, earlier, earlier_txg); 3636 dsl_dataset_rele(origin, FTAG); 3637 return (ret); 3638} 3639 3640void 3641dsl_dataset_zapify(dsl_dataset_t *ds, dmu_tx_t *tx) 3642{ 3643 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 3644 dmu_object_zapify(mos, ds->ds_object, DMU_OT_DSL_DATASET, tx); 3645} 3646 3647boolean_t 3648dsl_dataset_is_zapified(dsl_dataset_t *ds) 3649{ 3650 dmu_object_info_t doi; 3651 3652 dmu_object_info_from_db(ds->ds_dbuf, &doi); 3653 return (doi.doi_type == DMU_OTN_ZAP_METADATA); 3654} 3655 3656boolean_t 3657dsl_dataset_has_resume_receive_state(dsl_dataset_t *ds) 3658{ 3659 return (dsl_dataset_is_zapified(ds) && 3660 zap_contains(ds->ds_dir->dd_pool->dp_meta_objset, 3661 ds->ds_object, DS_FIELD_RESUME_TOGUID) == 0); 3662} 3663