1fa9e4066Sahrens /* 2fa9e4066Sahrens * CDDL HEADER START 3fa9e4066Sahrens * 4fa9e4066Sahrens * The contents of this file are subject to the terms of the 5ea8dc4b6Seschrock * Common Development and Distribution License (the "License"). 6ea8dc4b6Seschrock * You may not use this file except in compliance with the License. 7fa9e4066Sahrens * 8fa9e4066Sahrens * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9fa9e4066Sahrens * or http://www.opensolaris.org/os/licensing. 10fa9e4066Sahrens * See the License for the specific language governing permissions 11fa9e4066Sahrens * and limitations under the License. 12fa9e4066Sahrens * 13fa9e4066Sahrens * When distributing Covered Code, include this CDDL HEADER in each 14fa9e4066Sahrens * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15fa9e4066Sahrens * If applicable, add the following below this CDDL HEADER, with the 16fa9e4066Sahrens * fields enclosed by brackets "[]" replaced with your own identifying 17fa9e4066Sahrens * information: Portions Copyright [yyyy] [name of copyright owner] 18fa9e4066Sahrens * 19fa9e4066Sahrens * CDDL HEADER END 20fa9e4066Sahrens */ 21fa9e4066Sahrens /* 228f63aa46SLin Ling * Copyright 2009 Sun Microsystems, Inc. All rights reserved. 23fa9e4066Sahrens * Use is subject to license terms. 24fa9e4066Sahrens */ 25fa9e4066Sahrens 26fa9e4066Sahrens #include <sys/dsl_pool.h> 27fa9e4066Sahrens #include <sys/dsl_dataset.h> 28fa9e4066Sahrens #include <sys/dsl_dir.h> 291d452cf5Sahrens #include <sys/dsl_synctask.h> 30fa9e4066Sahrens #include <sys/dmu_tx.h> 31fa9e4066Sahrens #include <sys/dmu_objset.h> 32fa9e4066Sahrens #include <sys/arc.h> 33fa9e4066Sahrens #include <sys/zap.h> 34c717a561Smaybee #include <sys/zio.h> 35fa9e4066Sahrens #include <sys/zfs_context.h> 36fa9e4066Sahrens #include <sys/fs/zfs.h> 37088f3894Sahrens #include <sys/zfs_znode.h> 38088f3894Sahrens #include <sys/spa_impl.h> 39fa9e4066Sahrens 401ab7f2deSmaybee int zfs_no_write_throttle = 0; 4105715f94SMark Maybee int zfs_write_limit_shift = 3; /* 1/8th of physical memory */ 4205715f94SMark Maybee int zfs_txg_synctime = 5; /* target secs to sync a txg */ 4305715f94SMark Maybee 4405715f94SMark Maybee uint64_t zfs_write_limit_min = 32 << 20; /* min write limit is 32MB */ 4505715f94SMark Maybee uint64_t zfs_write_limit_max = 0; /* max data payload per txg */ 4605715f94SMark Maybee uint64_t zfs_write_limit_inflated = 0; 471ab7f2deSmaybee uint64_t zfs_write_limit_override = 0; 481ab7f2deSmaybee 4905715f94SMark Maybee kmutex_t zfs_write_limit_lock; 5005715f94SMark Maybee 5105715f94SMark Maybee static pgcnt_t old_physmem = 0; 52088f3894Sahrens 53ea8dc4b6Seschrock static int 54088f3894Sahrens dsl_pool_open_special_dir(dsl_pool_t *dp, const char *name, dsl_dir_t **ddp) 55fa9e4066Sahrens { 56fa9e4066Sahrens uint64_t obj; 57fa9e4066Sahrens int err; 58fa9e4066Sahrens 59fa9e4066Sahrens err = zap_lookup(dp->dp_meta_objset, 60fa9e4066Sahrens dp->dp_root_dir->dd_phys->dd_child_dir_zapobj, 61088f3894Sahrens name, sizeof (obj), 1, &obj); 62ea8dc4b6Seschrock if (err) 63ea8dc4b6Seschrock return (err); 64fa9e4066Sahrens 65088f3894Sahrens return (dsl_dir_open_obj(dp, obj, name, dp, ddp)); 66fa9e4066Sahrens } 67fa9e4066Sahrens 68fa9e4066Sahrens static dsl_pool_t * 69fa9e4066Sahrens dsl_pool_open_impl(spa_t *spa, uint64_t txg) 70fa9e4066Sahrens { 71fa9e4066Sahrens dsl_pool_t *dp; 72fa9e4066Sahrens blkptr_t *bp = spa_get_rootblkptr(spa); 73fa9e4066Sahrens 74fa9e4066Sahrens dp = kmem_zalloc(sizeof (dsl_pool_t), KM_SLEEP); 75fa9e4066Sahrens dp->dp_spa = spa; 76fa9e4066Sahrens dp->dp_meta_rootbp = *bp; 775ad82045Snd rw_init(&dp->dp_config_rwlock, NULL, RW_DEFAULT, NULL); 781ab7f2deSmaybee dp->dp_write_limit = zfs_write_limit_min; 79fa9e4066Sahrens txg_init(dp, txg); 80fa9e4066Sahrens 81fa9e4066Sahrens txg_list_create(&dp->dp_dirty_datasets, 82fa9e4066Sahrens offsetof(dsl_dataset_t, ds_dirty_link)); 83fa9e4066Sahrens txg_list_create(&dp->dp_dirty_dirs, 84fa9e4066Sahrens offsetof(dsl_dir_t, dd_dirty_link)); 851d452cf5Sahrens txg_list_create(&dp->dp_sync_tasks, 861d452cf5Sahrens offsetof(dsl_sync_task_group_t, dstg_node)); 873cb34c60Sahrens list_create(&dp->dp_synced_datasets, sizeof (dsl_dataset_t), 88fa9e4066Sahrens offsetof(dsl_dataset_t, ds_synced_link)); 89fa9e4066Sahrens 901ab7f2deSmaybee mutex_init(&dp->dp_lock, NULL, MUTEX_DEFAULT, NULL); 91088f3894Sahrens mutex_init(&dp->dp_scrub_cancel_lock, NULL, MUTEX_DEFAULT, NULL); 921ab7f2deSmaybee 939d3574bfSNeil Perrin dp->dp_vnrele_taskq = taskq_create("zfs_vn_rele_taskq", 1, minclsyspri, 949d3574bfSNeil Perrin 1, 4, 0); 959d3574bfSNeil Perrin 96fa9e4066Sahrens return (dp); 97fa9e4066Sahrens } 98fa9e4066Sahrens 99ea8dc4b6Seschrock int 100ea8dc4b6Seschrock dsl_pool_open(spa_t *spa, uint64_t txg, dsl_pool_t **dpp) 101fa9e4066Sahrens { 102fa9e4066Sahrens int err; 103fa9e4066Sahrens dsl_pool_t *dp = dsl_pool_open_impl(spa, txg); 104088f3894Sahrens dsl_dir_t *dd; 105088f3894Sahrens dsl_dataset_t *ds; 106fa9e4066Sahrens 107088f3894Sahrens rw_enter(&dp->dp_config_rwlock, RW_WRITER); 108503ad85cSMatthew Ahrens err = dmu_objset_open_impl(spa, NULL, &dp->dp_meta_rootbp, 109503ad85cSMatthew Ahrens &dp->dp_meta_objset); 110ea8dc4b6Seschrock if (err) 111ea8dc4b6Seschrock goto out; 112ea8dc4b6Seschrock 113fa9e4066Sahrens err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, 114fa9e4066Sahrens DMU_POOL_ROOT_DATASET, sizeof (uint64_t), 1, 115fa9e4066Sahrens &dp->dp_root_dir_obj); 116ea8dc4b6Seschrock if (err) 117ea8dc4b6Seschrock goto out; 118ea8dc4b6Seschrock 119ea8dc4b6Seschrock err = dsl_dir_open_obj(dp, dp->dp_root_dir_obj, 120ea8dc4b6Seschrock NULL, dp, &dp->dp_root_dir); 121ea8dc4b6Seschrock if (err) 122ea8dc4b6Seschrock goto out; 123fa9e4066Sahrens 124088f3894Sahrens err = dsl_pool_open_special_dir(dp, MOS_DIR_NAME, &dp->dp_mos_dir); 125ea8dc4b6Seschrock if (err) 126ea8dc4b6Seschrock goto out; 127ea8dc4b6Seschrock 128088f3894Sahrens if (spa_version(spa) >= SPA_VERSION_ORIGIN) { 129088f3894Sahrens err = dsl_pool_open_special_dir(dp, ORIGIN_DIR_NAME, &dd); 130088f3894Sahrens if (err) 131088f3894Sahrens goto out; 132088f3894Sahrens err = dsl_dataset_hold_obj(dp, dd->dd_phys->dd_head_dataset_obj, 133088f3894Sahrens FTAG, &ds); 1348f63aa46SLin Ling if (err == 0) { 1358f63aa46SLin Ling err = dsl_dataset_hold_obj(dp, 1368f63aa46SLin Ling ds->ds_phys->ds_prev_snap_obj, dp, 1378f63aa46SLin Ling &dp->dp_origin_snap); 1388f63aa46SLin Ling dsl_dataset_rele(ds, FTAG); 1398f63aa46SLin Ling } 1408f63aa46SLin Ling dsl_dir_close(dd, dp); 141088f3894Sahrens if (err) 142088f3894Sahrens goto out; 143088f3894Sahrens } 144088f3894Sahrens 145ca45db41SChris Kirby err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, 146ca45db41SChris Kirby DMU_POOL_TMP_USERREFS, sizeof (uint64_t), 1, 147ca45db41SChris Kirby &dp->dp_tmp_userrefs_obj); 148ca45db41SChris Kirby if (err == ENOENT) 149ca45db41SChris Kirby err = 0; 150ca45db41SChris Kirby if (err) 151ca45db41SChris Kirby goto out; 152ca45db41SChris Kirby 153088f3894Sahrens /* get scrub status */ 154088f3894Sahrens err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, 155088f3894Sahrens DMU_POOL_SCRUB_FUNC, sizeof (uint32_t), 1, 156088f3894Sahrens &dp->dp_scrub_func); 157088f3894Sahrens if (err == 0) { 158088f3894Sahrens err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, 159088f3894Sahrens DMU_POOL_SCRUB_QUEUE, sizeof (uint64_t), 1, 160088f3894Sahrens &dp->dp_scrub_queue_obj); 161088f3894Sahrens if (err) 162088f3894Sahrens goto out; 163088f3894Sahrens err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, 164088f3894Sahrens DMU_POOL_SCRUB_MIN_TXG, sizeof (uint64_t), 1, 165088f3894Sahrens &dp->dp_scrub_min_txg); 166088f3894Sahrens if (err) 167088f3894Sahrens goto out; 168088f3894Sahrens err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, 169088f3894Sahrens DMU_POOL_SCRUB_MAX_TXG, sizeof (uint64_t), 1, 170088f3894Sahrens &dp->dp_scrub_max_txg); 171088f3894Sahrens if (err) 172088f3894Sahrens goto out; 173088f3894Sahrens err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, 174088f3894Sahrens DMU_POOL_SCRUB_BOOKMARK, sizeof (uint64_t), 4, 175088f3894Sahrens &dp->dp_scrub_bookmark); 176088f3894Sahrens if (err) 177088f3894Sahrens goto out; 178088f3894Sahrens err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, 179088f3894Sahrens DMU_POOL_SCRUB_ERRORS, sizeof (uint64_t), 1, 180088f3894Sahrens &spa->spa_scrub_errors); 181088f3894Sahrens if (err) 182088f3894Sahrens goto out; 183088f3894Sahrens if (spa_version(spa) < SPA_VERSION_DSL_SCRUB) { 184088f3894Sahrens /* 185088f3894Sahrens * A new-type scrub was in progress on an old 186088f3894Sahrens * pool. Restart from the beginning, since the 187088f3894Sahrens * old software may have changed the pool in the 188088f3894Sahrens * meantime. 189088f3894Sahrens */ 190088f3894Sahrens dsl_pool_scrub_restart(dp); 191088f3894Sahrens } 192088f3894Sahrens } else { 193088f3894Sahrens /* 194088f3894Sahrens * It's OK if there is no scrub in progress (and if 195088f3894Sahrens * there was an I/O error, ignore it). 196088f3894Sahrens */ 197088f3894Sahrens err = 0; 198088f3894Sahrens } 199088f3894Sahrens 200ea8dc4b6Seschrock out: 201fa9e4066Sahrens rw_exit(&dp->dp_config_rwlock); 202ea8dc4b6Seschrock if (err) 203ea8dc4b6Seschrock dsl_pool_close(dp); 204ea8dc4b6Seschrock else 205ea8dc4b6Seschrock *dpp = dp; 206fa9e4066Sahrens 207ea8dc4b6Seschrock return (err); 208fa9e4066Sahrens } 209fa9e4066Sahrens 210fa9e4066Sahrens void 211fa9e4066Sahrens dsl_pool_close(dsl_pool_t *dp) 212fa9e4066Sahrens { 213088f3894Sahrens /* drop our references from dsl_pool_open() */ 214088f3894Sahrens 215088f3894Sahrens /* 216088f3894Sahrens * Since we held the origin_snap from "syncing" context (which 217088f3894Sahrens * includes pool-opening context), it actually only got a "ref" 218088f3894Sahrens * and not a hold, so just drop that here. 219088f3894Sahrens */ 220088f3894Sahrens if (dp->dp_origin_snap) 221088f3894Sahrens dsl_dataset_drop_ref(dp->dp_origin_snap, dp); 222ea8dc4b6Seschrock if (dp->dp_mos_dir) 223ea8dc4b6Seschrock dsl_dir_close(dp->dp_mos_dir, dp); 224ea8dc4b6Seschrock if (dp->dp_root_dir) 225ea8dc4b6Seschrock dsl_dir_close(dp->dp_root_dir, dp); 226fa9e4066Sahrens 227fa9e4066Sahrens /* undo the dmu_objset_open_impl(mos) from dsl_pool_open() */ 228ea8dc4b6Seschrock if (dp->dp_meta_objset) 229503ad85cSMatthew Ahrens dmu_objset_evict(dp->dp_meta_objset); 230fa9e4066Sahrens 231fa9e4066Sahrens txg_list_destroy(&dp->dp_dirty_datasets); 232fa9e4066Sahrens txg_list_destroy(&dp->dp_dirty_dirs); 2333cb34c60Sahrens list_destroy(&dp->dp_synced_datasets); 234fa9e4066Sahrens 235874395d5Smaybee arc_flush(dp->dp_spa); 236fa9e4066Sahrens txg_fini(dp); 2375ad82045Snd rw_destroy(&dp->dp_config_rwlock); 2381ab7f2deSmaybee mutex_destroy(&dp->dp_lock); 239088f3894Sahrens mutex_destroy(&dp->dp_scrub_cancel_lock); 2409d3574bfSNeil Perrin taskq_destroy(dp->dp_vnrele_taskq); 24188b7b0f2SMatthew Ahrens if (dp->dp_blkstats) 24288b7b0f2SMatthew Ahrens kmem_free(dp->dp_blkstats, sizeof (zfs_all_blkstats_t)); 243fa9e4066Sahrens kmem_free(dp, sizeof (dsl_pool_t)); 244fa9e4066Sahrens } 245fa9e4066Sahrens 246fa9e4066Sahrens dsl_pool_t * 2470a48a24eStimh dsl_pool_create(spa_t *spa, nvlist_t *zplprops, uint64_t txg) 248fa9e4066Sahrens { 249fa9e4066Sahrens int err; 250fa9e4066Sahrens dsl_pool_t *dp = dsl_pool_open_impl(spa, txg); 251fa9e4066Sahrens dmu_tx_t *tx = dmu_tx_create_assigned(dp, txg); 252503ad85cSMatthew Ahrens objset_t *os; 253088f3894Sahrens dsl_dataset_t *ds; 254088f3894Sahrens uint64_t dsobj; 255088f3894Sahrens 256088f3894Sahrens /* create and open the MOS (meta-objset) */ 257503ad85cSMatthew Ahrens dp->dp_meta_objset = dmu_objset_create_impl(spa, 258503ad85cSMatthew Ahrens NULL, &dp->dp_meta_rootbp, DMU_OST_META, tx); 259fa9e4066Sahrens 260fa9e4066Sahrens /* create the pool directory */ 261fa9e4066Sahrens err = zap_create_claim(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, 262fa9e4066Sahrens DMU_OT_OBJECT_DIRECTORY, DMU_OT_NONE, 0, tx); 263fa9e4066Sahrens ASSERT3U(err, ==, 0); 264fa9e4066Sahrens 265fa9e4066Sahrens /* create and open the root dir */ 266088f3894Sahrens dp->dp_root_dir_obj = dsl_dir_create_sync(dp, NULL, NULL, tx); 267ea8dc4b6Seschrock VERIFY(0 == dsl_dir_open_obj(dp, dp->dp_root_dir_obj, 268ea8dc4b6Seschrock NULL, dp, &dp->dp_root_dir)); 269fa9e4066Sahrens 270fa9e4066Sahrens /* create and open the meta-objset dir */ 271088f3894Sahrens (void) dsl_dir_create_sync(dp, dp->dp_root_dir, MOS_DIR_NAME, tx); 272088f3894Sahrens VERIFY(0 == dsl_pool_open_special_dir(dp, 273088f3894Sahrens MOS_DIR_NAME, &dp->dp_mos_dir)); 274088f3894Sahrens 275088f3894Sahrens if (spa_version(spa) >= SPA_VERSION_DSL_SCRUB) 276088f3894Sahrens dsl_pool_create_origin(dp, tx); 277088f3894Sahrens 278088f3894Sahrens /* create the root dataset */ 279088f3894Sahrens dsobj = dsl_dataset_create_sync_dd(dp->dp_root_dir, NULL, 0, tx); 280088f3894Sahrens 281088f3894Sahrens /* create the root objset */ 282088f3894Sahrens VERIFY(0 == dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds)); 283503ad85cSMatthew Ahrens os = dmu_objset_create_impl(dp->dp_spa, ds, 284088f3894Sahrens dsl_dataset_get_blkptr(ds), DMU_OST_ZFS, tx); 285088f3894Sahrens #ifdef _KERNEL 286503ad85cSMatthew Ahrens zfs_create_fs(os, kcred, zplprops, tx); 287088f3894Sahrens #endif 288088f3894Sahrens dsl_dataset_rele(ds, FTAG); 289fa9e4066Sahrens 290fa9e4066Sahrens dmu_tx_commit(tx); 291fa9e4066Sahrens 292fa9e4066Sahrens return (dp); 293fa9e4066Sahrens } 294fa9e4066Sahrens 295fa9e4066Sahrens void 296fa9e4066Sahrens dsl_pool_sync(dsl_pool_t *dp, uint64_t txg) 297fa9e4066Sahrens { 298c717a561Smaybee zio_t *zio; 299fa9e4066Sahrens dmu_tx_t *tx; 300c717a561Smaybee dsl_dir_t *dd; 301c717a561Smaybee dsl_dataset_t *ds; 302c717a561Smaybee dsl_sync_task_group_t *dstg; 303503ad85cSMatthew Ahrens objset_t *mos = dp->dp_meta_objset; 30405715f94SMark Maybee hrtime_t start, write_time; 30505715f94SMark Maybee uint64_t data_written; 306c717a561Smaybee int err; 307fa9e4066Sahrens 308fa9e4066Sahrens tx = dmu_tx_create_assigned(dp, txg); 309fa9e4066Sahrens 31005715f94SMark Maybee dp->dp_read_overhead = 0; 3110fd90d51SMark Maybee start = gethrtime(); 31214843421SMatthew Ahrens 313c717a561Smaybee zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED); 314c717a561Smaybee while (ds = txg_list_remove(&dp->dp_dirty_datasets, txg)) { 31514843421SMatthew Ahrens /* 31614843421SMatthew Ahrens * We must not sync any non-MOS datasets twice, because 31714843421SMatthew Ahrens * we may have taken a snapshot of them. However, we 31814843421SMatthew Ahrens * may sync newly-created datasets on pass 2. 31914843421SMatthew Ahrens */ 32014843421SMatthew Ahrens ASSERT(!list_link_active(&ds->ds_synced_link)); 32114843421SMatthew Ahrens list_insert_tail(&dp->dp_synced_datasets, ds); 322c717a561Smaybee dsl_dataset_sync(ds, zio, tx); 323c717a561Smaybee } 32405715f94SMark Maybee DTRACE_PROBE(pool_sync__1setup); 325c717a561Smaybee err = zio_wait(zio); 32614843421SMatthew Ahrens 32705715f94SMark Maybee write_time = gethrtime() - start; 328c717a561Smaybee ASSERT(err == 0); 32905715f94SMark Maybee DTRACE_PROBE(pool_sync__2rootzio); 330c717a561Smaybee 33114843421SMatthew Ahrens for (ds = list_head(&dp->dp_synced_datasets); ds; 33214843421SMatthew Ahrens ds = list_next(&dp->dp_synced_datasets, ds)) 333503ad85cSMatthew Ahrens dmu_objset_do_userquota_callbacks(ds->ds_objset, tx); 33414843421SMatthew Ahrens 33514843421SMatthew Ahrens /* 33614843421SMatthew Ahrens * Sync the datasets again to push out the changes due to 33714843421SMatthew Ahrens * userquota updates. This must be done before we process the 33814843421SMatthew Ahrens * sync tasks, because that could cause a snapshot of a dataset 33914843421SMatthew Ahrens * whose ds_bp will be rewritten when we do this 2nd sync. 34014843421SMatthew Ahrens */ 34114843421SMatthew Ahrens zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED); 34214843421SMatthew Ahrens while (ds = txg_list_remove(&dp->dp_dirty_datasets, txg)) { 34314843421SMatthew Ahrens ASSERT(list_link_active(&ds->ds_synced_link)); 34414843421SMatthew Ahrens dmu_buf_rele(ds->ds_dbuf, ds); 34514843421SMatthew Ahrens dsl_dataset_sync(ds, zio, tx); 34614843421SMatthew Ahrens } 34714843421SMatthew Ahrens err = zio_wait(zio); 34814843421SMatthew Ahrens 349*b24ab676SJeff Bonwick /* 350*b24ab676SJeff Bonwick * If anything was added to a deadlist during a zio done callback, 351*b24ab676SJeff Bonwick * it had to be put on the deferred queue. Enqueue it for real now. 352*b24ab676SJeff Bonwick */ 353*b24ab676SJeff Bonwick for (ds = list_head(&dp->dp_synced_datasets); ds; 354*b24ab676SJeff Bonwick ds = list_next(&dp->dp_synced_datasets, ds)) 355*b24ab676SJeff Bonwick bplist_sync(&ds->ds_deadlist, 356*b24ab676SJeff Bonwick bplist_enqueue_cb, &ds->ds_deadlist, tx); 357*b24ab676SJeff Bonwick 35814843421SMatthew Ahrens while (dstg = txg_list_remove(&dp->dp_sync_tasks, txg)) { 35914843421SMatthew Ahrens /* 36014843421SMatthew Ahrens * No more sync tasks should have been added while we 36114843421SMatthew Ahrens * were syncing. 36214843421SMatthew Ahrens */ 36314843421SMatthew Ahrens ASSERT(spa_sync_pass(dp->dp_spa) == 1); 364c717a561Smaybee dsl_sync_task_group_sync(dstg, tx); 36514843421SMatthew Ahrens } 36605715f94SMark Maybee DTRACE_PROBE(pool_sync__3task); 36705715f94SMark Maybee 36805715f94SMark Maybee start = gethrtime(); 369c717a561Smaybee while (dd = txg_list_remove(&dp->dp_dirty_dirs, txg)) 370c717a561Smaybee dsl_dir_sync(dd, tx); 37105715f94SMark Maybee write_time += gethrtime() - start; 372fa9e4066Sahrens 373088f3894Sahrens if (spa_sync_pass(dp->dp_spa) == 1) 374088f3894Sahrens dsl_pool_scrub_sync(dp, tx); 375088f3894Sahrens 37605715f94SMark Maybee start = gethrtime(); 377503ad85cSMatthew Ahrens if (list_head(&mos->os_dirty_dnodes[txg & TXG_MASK]) != NULL || 378503ad85cSMatthew Ahrens list_head(&mos->os_free_dnodes[txg & TXG_MASK]) != NULL) { 379c717a561Smaybee zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED); 380503ad85cSMatthew Ahrens dmu_objset_sync(mos, zio, tx); 381c717a561Smaybee err = zio_wait(zio); 382c717a561Smaybee ASSERT(err == 0); 383fa9e4066Sahrens dprintf_bp(&dp->dp_meta_rootbp, "meta objset rootbp is %s", ""); 384fa9e4066Sahrens spa_set_rootblkptr(dp->dp_spa, &dp->dp_meta_rootbp); 385fa9e4066Sahrens } 38605715f94SMark Maybee write_time += gethrtime() - start; 38705715f94SMark Maybee DTRACE_PROBE2(pool_sync__4io, hrtime_t, write_time, 38805715f94SMark Maybee hrtime_t, dp->dp_read_overhead); 38905715f94SMark Maybee write_time -= dp->dp_read_overhead; 390fa9e4066Sahrens 391fa9e4066Sahrens dmu_tx_commit(tx); 39205715f94SMark Maybee 39305715f94SMark Maybee data_written = dp->dp_space_towrite[txg & TXG_MASK]; 39405715f94SMark Maybee dp->dp_space_towrite[txg & TXG_MASK] = 0; 39505715f94SMark Maybee ASSERT(dp->dp_tempreserved[txg & TXG_MASK] == 0); 39605715f94SMark Maybee 39705715f94SMark Maybee /* 39805715f94SMark Maybee * If the write limit max has not been explicitly set, set it 39905715f94SMark Maybee * to a fraction of available physical memory (default 1/8th). 40005715f94SMark Maybee * Note that we must inflate the limit because the spa 40105715f94SMark Maybee * inflates write sizes to account for data replication. 40205715f94SMark Maybee * Check this each sync phase to catch changing memory size. 40305715f94SMark Maybee */ 40405715f94SMark Maybee if (physmem != old_physmem && zfs_write_limit_shift) { 40505715f94SMark Maybee mutex_enter(&zfs_write_limit_lock); 40605715f94SMark Maybee old_physmem = physmem; 40705715f94SMark Maybee zfs_write_limit_max = ptob(physmem) >> zfs_write_limit_shift; 40805715f94SMark Maybee zfs_write_limit_inflated = MAX(zfs_write_limit_min, 40905715f94SMark Maybee spa_get_asize(dp->dp_spa, zfs_write_limit_max)); 41005715f94SMark Maybee mutex_exit(&zfs_write_limit_lock); 41105715f94SMark Maybee } 41205715f94SMark Maybee 41305715f94SMark Maybee /* 41405715f94SMark Maybee * Attempt to keep the sync time consistent by adjusting the 41505715f94SMark Maybee * amount of write traffic allowed into each transaction group. 41605715f94SMark Maybee * Weight the throughput calculation towards the current value: 41705715f94SMark Maybee * thru = 3/4 old_thru + 1/4 new_thru 41805715f94SMark Maybee */ 41905715f94SMark Maybee ASSERT(zfs_write_limit_min > 0); 42005715f94SMark Maybee if (data_written > zfs_write_limit_min / 8 && write_time > 0) { 42105715f94SMark Maybee uint64_t throughput = (data_written * NANOSEC) / write_time; 42205715f94SMark Maybee if (dp->dp_throughput) 42305715f94SMark Maybee dp->dp_throughput = throughput / 4 + 42405715f94SMark Maybee 3 * dp->dp_throughput / 4; 42505715f94SMark Maybee else 42605715f94SMark Maybee dp->dp_throughput = throughput; 42705715f94SMark Maybee dp->dp_write_limit = MIN(zfs_write_limit_inflated, 42805715f94SMark Maybee MAX(zfs_write_limit_min, 42905715f94SMark Maybee dp->dp_throughput * zfs_txg_synctime)); 43005715f94SMark Maybee } 431fa9e4066Sahrens } 432fa9e4066Sahrens 433fa9e4066Sahrens void 434*b24ab676SJeff Bonwick dsl_pool_sync_done(dsl_pool_t *dp, uint64_t txg) 435fa9e4066Sahrens { 436fa9e4066Sahrens dsl_dataset_t *ds; 437*b24ab676SJeff Bonwick objset_t *os; 438fa9e4066Sahrens 4393cb34c60Sahrens while (ds = list_head(&dp->dp_synced_datasets)) { 4403cb34c60Sahrens list_remove(&dp->dp_synced_datasets, ds); 441*b24ab676SJeff Bonwick os = ds->ds_objset; 442*b24ab676SJeff Bonwick zil_clean(os->os_zil); 443*b24ab676SJeff Bonwick ASSERT(!dmu_objset_is_dirty(os, txg)); 444af2c4821Smaybee dmu_buf_rele(ds->ds_dbuf, ds); 445fa9e4066Sahrens } 446*b24ab676SJeff Bonwick ASSERT(!dmu_objset_is_dirty(dp->dp_meta_objset, txg)); 447fa9e4066Sahrens } 448fa9e4066Sahrens 449c717a561Smaybee /* 450c717a561Smaybee * TRUE if the current thread is the tx_sync_thread or if we 451c717a561Smaybee * are being called from SPA context during pool initialization. 452c717a561Smaybee */ 453fa9e4066Sahrens int 454fa9e4066Sahrens dsl_pool_sync_context(dsl_pool_t *dp) 455fa9e4066Sahrens { 456fa9e4066Sahrens return (curthread == dp->dp_tx.tx_sync_thread || 457c717a561Smaybee spa_get_dsl(dp->dp_spa) == NULL); 458fa9e4066Sahrens } 459fa9e4066Sahrens 460fa9e4066Sahrens uint64_t 461fa9e4066Sahrens dsl_pool_adjustedsize(dsl_pool_t *dp, boolean_t netfree) 462fa9e4066Sahrens { 463fa9e4066Sahrens uint64_t space, resv; 464fa9e4066Sahrens 465fa9e4066Sahrens /* 46644cd46caSbillm * Reserve about 1.6% (1/64), or at least 32MB, for allocation 467fa9e4066Sahrens * efficiency. 468fa9e4066Sahrens * XXX The intent log is not accounted for, so it must fit 469fa9e4066Sahrens * within this slop. 470fa9e4066Sahrens * 471fa9e4066Sahrens * If we're trying to assess whether it's OK to do a free, 472fa9e4066Sahrens * cut the reservation in half to allow forward progress 473fa9e4066Sahrens * (e.g. make it possible to rm(1) files from a full pool). 474fa9e4066Sahrens */ 475*b24ab676SJeff Bonwick space = metaslab_class_get_dspace(spa_normal_class(dp->dp_spa)); 47644cd46caSbillm resv = MAX(space >> 6, SPA_MINDEVSIZE >> 1); 477fa9e4066Sahrens if (netfree) 478fa9e4066Sahrens resv >>= 1; 479fa9e4066Sahrens 480fa9e4066Sahrens return (space - resv); 481fa9e4066Sahrens } 4821ab7f2deSmaybee 4831ab7f2deSmaybee int 4841ab7f2deSmaybee dsl_pool_tempreserve_space(dsl_pool_t *dp, uint64_t space, dmu_tx_t *tx) 4851ab7f2deSmaybee { 4861ab7f2deSmaybee uint64_t reserved = 0; 4871ab7f2deSmaybee uint64_t write_limit = (zfs_write_limit_override ? 4881ab7f2deSmaybee zfs_write_limit_override : dp->dp_write_limit); 4891ab7f2deSmaybee 4901ab7f2deSmaybee if (zfs_no_write_throttle) { 491c5904d13Seschrock atomic_add_64(&dp->dp_tempreserved[tx->tx_txg & TXG_MASK], 492c5904d13Seschrock space); 4931ab7f2deSmaybee return (0); 4941ab7f2deSmaybee } 4951ab7f2deSmaybee 4961ab7f2deSmaybee /* 4971ab7f2deSmaybee * Check to see if we have exceeded the maximum allowed IO for 4981ab7f2deSmaybee * this transaction group. We can do this without locks since 4991ab7f2deSmaybee * a little slop here is ok. Note that we do the reserved check 5001ab7f2deSmaybee * with only half the requested reserve: this is because the 5011ab7f2deSmaybee * reserve requests are worst-case, and we really don't want to 5021ab7f2deSmaybee * throttle based off of worst-case estimates. 5031ab7f2deSmaybee */ 5041ab7f2deSmaybee if (write_limit > 0) { 5051ab7f2deSmaybee reserved = dp->dp_space_towrite[tx->tx_txg & TXG_MASK] 5061ab7f2deSmaybee + dp->dp_tempreserved[tx->tx_txg & TXG_MASK] / 2; 5071ab7f2deSmaybee 5081ab7f2deSmaybee if (reserved && reserved > write_limit) 5091ab7f2deSmaybee return (ERESTART); 5101ab7f2deSmaybee } 5111ab7f2deSmaybee 5121ab7f2deSmaybee atomic_add_64(&dp->dp_tempreserved[tx->tx_txg & TXG_MASK], space); 5131ab7f2deSmaybee 5141ab7f2deSmaybee /* 5151ab7f2deSmaybee * If this transaction group is over 7/8ths capacity, delay 5161ab7f2deSmaybee * the caller 1 clock tick. This will slow down the "fill" 5171ab7f2deSmaybee * rate until the sync process can catch up with us. 5181ab7f2deSmaybee */ 519e8397a2bSgw if (reserved && reserved > (write_limit - (write_limit >> 3))) 5201ab7f2deSmaybee txg_delay(dp, tx->tx_txg, 1); 5211ab7f2deSmaybee 5221ab7f2deSmaybee return (0); 5231ab7f2deSmaybee } 5241ab7f2deSmaybee 5251ab7f2deSmaybee void 5261ab7f2deSmaybee dsl_pool_tempreserve_clear(dsl_pool_t *dp, int64_t space, dmu_tx_t *tx) 5271ab7f2deSmaybee { 5281ab7f2deSmaybee ASSERT(dp->dp_tempreserved[tx->tx_txg & TXG_MASK] >= space); 5291ab7f2deSmaybee atomic_add_64(&dp->dp_tempreserved[tx->tx_txg & TXG_MASK], -space); 5301ab7f2deSmaybee } 5311ab7f2deSmaybee 5321ab7f2deSmaybee void 5331ab7f2deSmaybee dsl_pool_memory_pressure(dsl_pool_t *dp) 5341ab7f2deSmaybee { 5351ab7f2deSmaybee uint64_t space_inuse = 0; 5361ab7f2deSmaybee int i; 5371ab7f2deSmaybee 5381ab7f2deSmaybee if (dp->dp_write_limit == zfs_write_limit_min) 5391ab7f2deSmaybee return; 5401ab7f2deSmaybee 5411ab7f2deSmaybee for (i = 0; i < TXG_SIZE; i++) { 5421ab7f2deSmaybee space_inuse += dp->dp_space_towrite[i]; 5431ab7f2deSmaybee space_inuse += dp->dp_tempreserved[i]; 5441ab7f2deSmaybee } 5451ab7f2deSmaybee dp->dp_write_limit = MAX(zfs_write_limit_min, 5461ab7f2deSmaybee MIN(dp->dp_write_limit, space_inuse / 4)); 5471ab7f2deSmaybee } 5481ab7f2deSmaybee 5491ab7f2deSmaybee void 5501ab7f2deSmaybee dsl_pool_willuse_space(dsl_pool_t *dp, int64_t space, dmu_tx_t *tx) 5511ab7f2deSmaybee { 5521ab7f2deSmaybee if (space > 0) { 5531ab7f2deSmaybee mutex_enter(&dp->dp_lock); 5541ab7f2deSmaybee dp->dp_space_towrite[tx->tx_txg & TXG_MASK] += space; 5551ab7f2deSmaybee mutex_exit(&dp->dp_lock); 5561ab7f2deSmaybee } 5571ab7f2deSmaybee } 558088f3894Sahrens 559088f3894Sahrens /* ARGSUSED */ 560088f3894Sahrens static int 561088f3894Sahrens upgrade_clones_cb(spa_t *spa, uint64_t dsobj, const char *dsname, void *arg) 562088f3894Sahrens { 563088f3894Sahrens dmu_tx_t *tx = arg; 564088f3894Sahrens dsl_dataset_t *ds, *prev = NULL; 565088f3894Sahrens int err; 566088f3894Sahrens dsl_pool_t *dp = spa_get_dsl(spa); 567088f3894Sahrens 568088f3894Sahrens err = dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds); 569088f3894Sahrens if (err) 570088f3894Sahrens return (err); 571088f3894Sahrens 572088f3894Sahrens while (ds->ds_phys->ds_prev_snap_obj != 0) { 573088f3894Sahrens err = dsl_dataset_hold_obj(dp, ds->ds_phys->ds_prev_snap_obj, 574088f3894Sahrens FTAG, &prev); 575088f3894Sahrens if (err) { 576088f3894Sahrens dsl_dataset_rele(ds, FTAG); 577088f3894Sahrens return (err); 578088f3894Sahrens } 579088f3894Sahrens 580088f3894Sahrens if (prev->ds_phys->ds_next_snap_obj != ds->ds_object) 581088f3894Sahrens break; 582088f3894Sahrens dsl_dataset_rele(ds, FTAG); 583088f3894Sahrens ds = prev; 584088f3894Sahrens prev = NULL; 585088f3894Sahrens } 586088f3894Sahrens 587088f3894Sahrens if (prev == NULL) { 588088f3894Sahrens prev = dp->dp_origin_snap; 589088f3894Sahrens 590088f3894Sahrens /* 591088f3894Sahrens * The $ORIGIN can't have any data, or the accounting 592088f3894Sahrens * will be wrong. 593088f3894Sahrens */ 594088f3894Sahrens ASSERT(prev->ds_phys->ds_bp.blk_birth == 0); 595088f3894Sahrens 596088f3894Sahrens /* The origin doesn't get attached to itself */ 597088f3894Sahrens if (ds->ds_object == prev->ds_object) { 598088f3894Sahrens dsl_dataset_rele(ds, FTAG); 599088f3894Sahrens return (0); 600088f3894Sahrens } 601088f3894Sahrens 602088f3894Sahrens dmu_buf_will_dirty(ds->ds_dbuf, tx); 603088f3894Sahrens ds->ds_phys->ds_prev_snap_obj = prev->ds_object; 604088f3894Sahrens ds->ds_phys->ds_prev_snap_txg = prev->ds_phys->ds_creation_txg; 605088f3894Sahrens 606088f3894Sahrens dmu_buf_will_dirty(ds->ds_dir->dd_dbuf, tx); 607088f3894Sahrens ds->ds_dir->dd_phys->dd_origin_obj = prev->ds_object; 608088f3894Sahrens 609088f3894Sahrens dmu_buf_will_dirty(prev->ds_dbuf, tx); 610088f3894Sahrens prev->ds_phys->ds_num_children++; 611088f3894Sahrens 612088f3894Sahrens if (ds->ds_phys->ds_next_snap_obj == 0) { 613088f3894Sahrens ASSERT(ds->ds_prev == NULL); 614088f3894Sahrens VERIFY(0 == dsl_dataset_hold_obj(dp, 615088f3894Sahrens ds->ds_phys->ds_prev_snap_obj, ds, &ds->ds_prev)); 616088f3894Sahrens } 617088f3894Sahrens } 618088f3894Sahrens 619088f3894Sahrens ASSERT(ds->ds_dir->dd_phys->dd_origin_obj == prev->ds_object); 620088f3894Sahrens ASSERT(ds->ds_phys->ds_prev_snap_obj == prev->ds_object); 621088f3894Sahrens 622088f3894Sahrens if (prev->ds_phys->ds_next_clones_obj == 0) { 623c33e334fSMatthew Ahrens dmu_buf_will_dirty(prev->ds_dbuf, tx); 624088f3894Sahrens prev->ds_phys->ds_next_clones_obj = 625088f3894Sahrens zap_create(dp->dp_meta_objset, 626088f3894Sahrens DMU_OT_NEXT_CLONES, DMU_OT_NONE, 0, tx); 627088f3894Sahrens } 628088f3894Sahrens VERIFY(0 == zap_add_int(dp->dp_meta_objset, 629088f3894Sahrens prev->ds_phys->ds_next_clones_obj, ds->ds_object, tx)); 630088f3894Sahrens 631088f3894Sahrens dsl_dataset_rele(ds, FTAG); 632088f3894Sahrens if (prev != dp->dp_origin_snap) 633088f3894Sahrens dsl_dataset_rele(prev, FTAG); 634088f3894Sahrens return (0); 635088f3894Sahrens } 636088f3894Sahrens 637088f3894Sahrens void 638088f3894Sahrens dsl_pool_upgrade_clones(dsl_pool_t *dp, dmu_tx_t *tx) 639088f3894Sahrens { 640088f3894Sahrens ASSERT(dmu_tx_is_syncing(tx)); 641088f3894Sahrens ASSERT(dp->dp_origin_snap != NULL); 642088f3894Sahrens 643c33e334fSMatthew Ahrens VERIFY3U(0, ==, dmu_objset_find_spa(dp->dp_spa, NULL, upgrade_clones_cb, 644c33e334fSMatthew Ahrens tx, DS_FIND_CHILDREN)); 645088f3894Sahrens } 646088f3894Sahrens 647088f3894Sahrens void 648088f3894Sahrens dsl_pool_create_origin(dsl_pool_t *dp, dmu_tx_t *tx) 649088f3894Sahrens { 650088f3894Sahrens uint64_t dsobj; 651088f3894Sahrens dsl_dataset_t *ds; 652088f3894Sahrens 653088f3894Sahrens ASSERT(dmu_tx_is_syncing(tx)); 654088f3894Sahrens ASSERT(dp->dp_origin_snap == NULL); 655088f3894Sahrens 656088f3894Sahrens /* create the origin dir, ds, & snap-ds */ 657088f3894Sahrens rw_enter(&dp->dp_config_rwlock, RW_WRITER); 658088f3894Sahrens dsobj = dsl_dataset_create_sync(dp->dp_root_dir, ORIGIN_DIR_NAME, 659088f3894Sahrens NULL, 0, kcred, tx); 660088f3894Sahrens VERIFY(0 == dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds)); 661088f3894Sahrens dsl_dataset_snapshot_sync(ds, ORIGIN_DIR_NAME, kcred, tx); 662088f3894Sahrens VERIFY(0 == dsl_dataset_hold_obj(dp, ds->ds_phys->ds_prev_snap_obj, 663088f3894Sahrens dp, &dp->dp_origin_snap)); 664088f3894Sahrens dsl_dataset_rele(ds, FTAG); 665088f3894Sahrens rw_exit(&dp->dp_config_rwlock); 666088f3894Sahrens } 6679d3574bfSNeil Perrin 6689d3574bfSNeil Perrin taskq_t * 6699d3574bfSNeil Perrin dsl_pool_vnrele_taskq(dsl_pool_t *dp) 6709d3574bfSNeil Perrin { 6719d3574bfSNeil Perrin return (dp->dp_vnrele_taskq); 6729d3574bfSNeil Perrin } 673ca45db41SChris Kirby 674ca45db41SChris Kirby /* 675ca45db41SChris Kirby * Walk through the pool-wide zap object of temporary snapshot user holds 676ca45db41SChris Kirby * and release them. 677ca45db41SChris Kirby */ 678ca45db41SChris Kirby void 679ca45db41SChris Kirby dsl_pool_clean_tmp_userrefs(dsl_pool_t *dp) 680ca45db41SChris Kirby { 681ca45db41SChris Kirby zap_attribute_t za; 682ca45db41SChris Kirby zap_cursor_t zc; 683ca45db41SChris Kirby objset_t *mos = dp->dp_meta_objset; 684ca45db41SChris Kirby uint64_t zapobj = dp->dp_tmp_userrefs_obj; 685ca45db41SChris Kirby 686ca45db41SChris Kirby if (zapobj == 0) 687ca45db41SChris Kirby return; 688ca45db41SChris Kirby ASSERT(spa_version(dp->dp_spa) >= SPA_VERSION_USERREFS); 689ca45db41SChris Kirby 690ca45db41SChris Kirby for (zap_cursor_init(&zc, mos, zapobj); 691ca45db41SChris Kirby zap_cursor_retrieve(&zc, &za) == 0; 692ca45db41SChris Kirby zap_cursor_advance(&zc)) { 693ca45db41SChris Kirby char *htag; 694ca45db41SChris Kirby uint64_t dsobj; 695ca45db41SChris Kirby 696ca45db41SChris Kirby htag = strchr(za.za_name, '-'); 697ca45db41SChris Kirby *htag = '\0'; 698ca45db41SChris Kirby ++htag; 699ca45db41SChris Kirby dsobj = strtonum(za.za_name, NULL); 700ca45db41SChris Kirby (void) dsl_dataset_user_release_tmp(dp, dsobj, htag); 701ca45db41SChris Kirby } 702ca45db41SChris Kirby zap_cursor_fini(&zc); 703ca45db41SChris Kirby } 704ca45db41SChris Kirby 705ca45db41SChris Kirby /* 706ca45db41SChris Kirby * Create the pool-wide zap object for storing temporary snapshot holds. 707ca45db41SChris Kirby */ 708ca45db41SChris Kirby void 709ca45db41SChris Kirby dsl_pool_user_hold_create_obj(dsl_pool_t *dp, dmu_tx_t *tx) 710ca45db41SChris Kirby { 711ca45db41SChris Kirby objset_t *mos = dp->dp_meta_objset; 712ca45db41SChris Kirby 713ca45db41SChris Kirby ASSERT(dp->dp_tmp_userrefs_obj == 0); 714ca45db41SChris Kirby ASSERT(dmu_tx_is_syncing(tx)); 715ca45db41SChris Kirby 716ca45db41SChris Kirby dp->dp_tmp_userrefs_obj = zap_create(mos, DMU_OT_USERREFS, 717ca45db41SChris Kirby DMU_OT_NONE, 0, tx); 718ca45db41SChris Kirby 719ca45db41SChris Kirby VERIFY(zap_add(mos, DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_TMP_USERREFS, 720ca45db41SChris Kirby sizeof (uint64_t), 1, &dp->dp_tmp_userrefs_obj, tx) == 0); 721ca45db41SChris Kirby } 722ca45db41SChris Kirby 723ca45db41SChris Kirby static int 724ca45db41SChris Kirby dsl_pool_user_hold_rele_impl(dsl_pool_t *dp, uint64_t dsobj, 725ca45db41SChris Kirby const char *tag, time_t *t, dmu_tx_t *tx, boolean_t holding) 726ca45db41SChris Kirby { 727ca45db41SChris Kirby objset_t *mos = dp->dp_meta_objset; 728ca45db41SChris Kirby uint64_t zapobj = dp->dp_tmp_userrefs_obj; 729ca45db41SChris Kirby char *name; 730ca45db41SChris Kirby int error; 731ca45db41SChris Kirby 732ca45db41SChris Kirby ASSERT(spa_version(dp->dp_spa) >= SPA_VERSION_USERREFS); 733ca45db41SChris Kirby ASSERT(dmu_tx_is_syncing(tx)); 734ca45db41SChris Kirby 735ca45db41SChris Kirby /* 736ca45db41SChris Kirby * If the pool was created prior to SPA_VERSION_USERREFS, the 737ca45db41SChris Kirby * zap object for temporary holds might not exist yet. 738ca45db41SChris Kirby */ 739ca45db41SChris Kirby if (zapobj == 0) { 740ca45db41SChris Kirby if (holding) { 741ca45db41SChris Kirby dsl_pool_user_hold_create_obj(dp, tx); 742ca45db41SChris Kirby zapobj = dp->dp_tmp_userrefs_obj; 743ca45db41SChris Kirby } else { 744ca45db41SChris Kirby return (ENOENT); 745ca45db41SChris Kirby } 746ca45db41SChris Kirby } 747ca45db41SChris Kirby 748ca45db41SChris Kirby name = kmem_asprintf("%llx-%s", (u_longlong_t)dsobj, tag); 749ca45db41SChris Kirby if (holding) 750ca45db41SChris Kirby error = zap_add(mos, zapobj, name, 8, 1, t, tx); 751ca45db41SChris Kirby else 752ca45db41SChris Kirby error = zap_remove(mos, zapobj, name, tx); 753ca45db41SChris Kirby strfree(name); 754ca45db41SChris Kirby 755ca45db41SChris Kirby return (error); 756ca45db41SChris Kirby } 757ca45db41SChris Kirby 758ca45db41SChris Kirby /* 759ca45db41SChris Kirby * Add a temporary hold for the given dataset object and tag. 760ca45db41SChris Kirby */ 761ca45db41SChris Kirby int 762ca45db41SChris Kirby dsl_pool_user_hold(dsl_pool_t *dp, uint64_t dsobj, const char *tag, 763ca45db41SChris Kirby time_t *t, dmu_tx_t *tx) 764ca45db41SChris Kirby { 765ca45db41SChris Kirby return (dsl_pool_user_hold_rele_impl(dp, dsobj, tag, t, tx, B_TRUE)); 766ca45db41SChris Kirby } 767ca45db41SChris Kirby 768ca45db41SChris Kirby /* 769ca45db41SChris Kirby * Release a temporary hold for the given dataset object and tag. 770ca45db41SChris Kirby */ 771ca45db41SChris Kirby int 772ca45db41SChris Kirby dsl_pool_user_release(dsl_pool_t *dp, uint64_t dsobj, const char *tag, 773ca45db41SChris Kirby dmu_tx_t *tx) 774ca45db41SChris Kirby { 775ca45db41SChris Kirby return (dsl_pool_user_hold_rele_impl(dp, dsobj, tag, NULL, 776ca45db41SChris Kirby tx, B_FALSE)); 777ca45db41SChris Kirby } 778