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 /* 223f9d6ad7SLin Ling * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 232a104a52SAlex Reece * Copyright (c) 2011, 2014 by Delphix. All rights reserved. 24a7a845e4SSteven Hartland * Copyright (c) 2013 Steven Hartland. All rights reserved. 25bc9014e6SJustin Gibbs * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved. 26fa9e4066Sahrens */ 27fa9e4066Sahrens 28fa9e4066Sahrens #include <sys/dsl_pool.h> 29fa9e4066Sahrens #include <sys/dsl_dataset.h> 303f9d6ad7SLin Ling #include <sys/dsl_prop.h> 31fa9e4066Sahrens #include <sys/dsl_dir.h> 321d452cf5Sahrens #include <sys/dsl_synctask.h> 333f9d6ad7SLin Ling #include <sys/dsl_scan.h> 343f9d6ad7SLin Ling #include <sys/dnode.h> 35fa9e4066Sahrens #include <sys/dmu_tx.h> 36fa9e4066Sahrens #include <sys/dmu_objset.h> 37fa9e4066Sahrens #include <sys/arc.h> 38fa9e4066Sahrens #include <sys/zap.h> 39c717a561Smaybee #include <sys/zio.h> 40fa9e4066Sahrens #include <sys/zfs_context.h> 41fa9e4066Sahrens #include <sys/fs/zfs.h> 42088f3894Sahrens #include <sys/zfs_znode.h> 43088f3894Sahrens #include <sys/spa_impl.h> 44cde58dbcSMatthew Ahrens #include <sys/dsl_deadlist.h> 45ad135b5dSChristopher Siden #include <sys/bptree.h> 46ad135b5dSChristopher Siden #include <sys/zfeature.h> 47ce636f8bSMatthew Ahrens #include <sys/zil_impl.h> 483b2aab18SMatthew Ahrens #include <sys/dsl_userhold.h> 49fa9e4066Sahrens 5069962b56SMatthew Ahrens /* 5169962b56SMatthew Ahrens * ZFS Write Throttle 5269962b56SMatthew Ahrens * ------------------ 5369962b56SMatthew Ahrens * 5469962b56SMatthew Ahrens * ZFS must limit the rate of incoming writes to the rate at which it is able 5569962b56SMatthew Ahrens * to sync data modifications to the backend storage. Throttling by too much 5669962b56SMatthew Ahrens * creates an artificial limit; throttling by too little can only be sustained 5769962b56SMatthew Ahrens * for short periods and would lead to highly lumpy performance. On a per-pool 5869962b56SMatthew Ahrens * basis, ZFS tracks the amount of modified (dirty) data. As operations change 5969962b56SMatthew Ahrens * data, the amount of dirty data increases; as ZFS syncs out data, the amount 6069962b56SMatthew Ahrens * of dirty data decreases. When the amount of dirty data exceeds a 6169962b56SMatthew Ahrens * predetermined threshold further modifications are blocked until the amount 6269962b56SMatthew Ahrens * of dirty data decreases (as data is synced out). 6369962b56SMatthew Ahrens * 6469962b56SMatthew Ahrens * The limit on dirty data is tunable, and should be adjusted according to 6569962b56SMatthew Ahrens * both the IO capacity and available memory of the system. The larger the 6669962b56SMatthew Ahrens * window, the more ZFS is able to aggregate and amortize metadata (and data) 6769962b56SMatthew Ahrens * changes. However, memory is a limited resource, and allowing for more dirty 6869962b56SMatthew Ahrens * data comes at the cost of keeping other useful data in memory (for example 6969962b56SMatthew Ahrens * ZFS data cached by the ARC). 7069962b56SMatthew Ahrens * 7169962b56SMatthew Ahrens * Implementation 7269962b56SMatthew Ahrens * 7369962b56SMatthew Ahrens * As buffers are modified dsl_pool_willuse_space() increments both the per- 7469962b56SMatthew Ahrens * txg (dp_dirty_pertxg[]) and poolwide (dp_dirty_total) accounting of 7569962b56SMatthew Ahrens * dirty space used; dsl_pool_dirty_space() decrements those values as data 7669962b56SMatthew Ahrens * is synced out from dsl_pool_sync(). While only the poolwide value is 7769962b56SMatthew Ahrens * relevant, the per-txg value is useful for debugging. The tunable 7869962b56SMatthew Ahrens * zfs_dirty_data_max determines the dirty space limit. Once that value is 7969962b56SMatthew Ahrens * exceeded, new writes are halted until space frees up. 8069962b56SMatthew Ahrens * 8169962b56SMatthew Ahrens * The zfs_dirty_data_sync tunable dictates the threshold at which we 8269962b56SMatthew Ahrens * ensure that there is a txg syncing (see the comment in txg.c for a full 8369962b56SMatthew Ahrens * description of transaction group stages). 8469962b56SMatthew Ahrens * 8569962b56SMatthew Ahrens * The IO scheduler uses both the dirty space limit and current amount of 8669962b56SMatthew Ahrens * dirty data as inputs. Those values affect the number of concurrent IOs ZFS 8769962b56SMatthew Ahrens * issues. See the comment in vdev_queue.c for details of the IO scheduler. 8869962b56SMatthew Ahrens * 8969962b56SMatthew Ahrens * The delay is also calculated based on the amount of dirty data. See the 9069962b56SMatthew Ahrens * comment above dmu_tx_delay() for details. 9169962b56SMatthew Ahrens */ 9269962b56SMatthew Ahrens 9369962b56SMatthew Ahrens /* 9469962b56SMatthew Ahrens * zfs_dirty_data_max will be set to zfs_dirty_data_max_percent% of all memory, 9569962b56SMatthew Ahrens * capped at zfs_dirty_data_max_max. It can also be overridden in /etc/system. 9669962b56SMatthew Ahrens */ 9769962b56SMatthew Ahrens uint64_t zfs_dirty_data_max; 9869962b56SMatthew Ahrens uint64_t zfs_dirty_data_max_max = 4ULL * 1024 * 1024 * 1024; 9969962b56SMatthew Ahrens int zfs_dirty_data_max_percent = 10; 10069962b56SMatthew Ahrens 10169962b56SMatthew Ahrens /* 10269962b56SMatthew Ahrens * If there is at least this much dirty data, push out a txg. 10369962b56SMatthew Ahrens */ 10469962b56SMatthew Ahrens uint64_t zfs_dirty_data_sync = 64 * 1024 * 1024; 10569962b56SMatthew Ahrens 10669962b56SMatthew Ahrens /* 10769962b56SMatthew Ahrens * Once there is this amount of dirty data, the dmu_tx_delay() will kick in 10869962b56SMatthew Ahrens * and delay each transaction. 10969962b56SMatthew Ahrens * This value should be >= zfs_vdev_async_write_active_max_dirty_percent. 11069962b56SMatthew Ahrens */ 11169962b56SMatthew Ahrens int zfs_delay_min_dirty_percent = 60; 11269962b56SMatthew Ahrens 11369962b56SMatthew Ahrens /* 11469962b56SMatthew Ahrens * This controls how quickly the delay approaches infinity. 115d85a1e96SMatthew Ahrens * Larger values cause it to delay more for a given amount of dirty data. 116d85a1e96SMatthew Ahrens * Therefore larger values will cause there to be less dirty data for a 11769962b56SMatthew Ahrens * given throughput. 11869962b56SMatthew Ahrens * 11969962b56SMatthew Ahrens * For the smoothest delay, this value should be about 1 billion divided 12069962b56SMatthew Ahrens * by the maximum number of operations per second. This will smoothly 12169962b56SMatthew Ahrens * handle between 10x and 1/10th this number. 12269962b56SMatthew Ahrens * 12369962b56SMatthew Ahrens * Note: zfs_delay_scale * zfs_dirty_data_max must be < 2^64, due to the 12469962b56SMatthew Ahrens * multiply in dmu_tx_delay(). 12569962b56SMatthew Ahrens */ 12669962b56SMatthew Ahrens uint64_t zfs_delay_scale = 1000 * 1000 * 1000 / 2000; 12705715f94SMark Maybee 1281ab7f2deSmaybee 1290689f76cSAdam Leventhal hrtime_t zfs_throttle_delay = MSEC2NSEC(10); 1300689f76cSAdam Leventhal hrtime_t zfs_throttle_resolution = MSEC2NSEC(10); 1310689f76cSAdam Leventhal 1323f9d6ad7SLin Ling int 133088f3894Sahrens dsl_pool_open_special_dir(dsl_pool_t *dp, const char *name, dsl_dir_t **ddp) 134fa9e4066Sahrens { 135fa9e4066Sahrens uint64_t obj; 136fa9e4066Sahrens int err; 137fa9e4066Sahrens 138fa9e4066Sahrens err = zap_lookup(dp->dp_meta_objset, 139c1379625SJustin T. Gibbs dsl_dir_phys(dp->dp_root_dir)->dd_child_dir_zapobj, 140088f3894Sahrens name, sizeof (obj), 1, &obj); 141ea8dc4b6Seschrock if (err) 142ea8dc4b6Seschrock return (err); 143fa9e4066Sahrens 1443b2aab18SMatthew Ahrens return (dsl_dir_hold_obj(dp, obj, name, dp, ddp)); 145fa9e4066Sahrens } 146fa9e4066Sahrens 147fa9e4066Sahrens static dsl_pool_t * 148fa9e4066Sahrens dsl_pool_open_impl(spa_t *spa, uint64_t txg) 149fa9e4066Sahrens { 150fa9e4066Sahrens dsl_pool_t *dp; 151fa9e4066Sahrens blkptr_t *bp = spa_get_rootblkptr(spa); 152fa9e4066Sahrens 153fa9e4066Sahrens dp = kmem_zalloc(sizeof (dsl_pool_t), KM_SLEEP); 154fa9e4066Sahrens dp->dp_spa = spa; 155fa9e4066Sahrens dp->dp_meta_rootbp = *bp; 1563b2aab18SMatthew Ahrens rrw_init(&dp->dp_config_rwlock, B_TRUE); 157fa9e4066Sahrens txg_init(dp, txg); 158fa9e4066Sahrens 159fa9e4066Sahrens txg_list_create(&dp->dp_dirty_datasets, 160fa9e4066Sahrens offsetof(dsl_dataset_t, ds_dirty_link)); 161ce636f8bSMatthew Ahrens txg_list_create(&dp->dp_dirty_zilogs, 162ce636f8bSMatthew Ahrens offsetof(zilog_t, zl_dirty_link)); 163fa9e4066Sahrens txg_list_create(&dp->dp_dirty_dirs, 164fa9e4066Sahrens offsetof(dsl_dir_t, dd_dirty_link)); 1651d452cf5Sahrens txg_list_create(&dp->dp_sync_tasks, 1663b2aab18SMatthew Ahrens offsetof(dsl_sync_task_t, dst_node)); 167fa9e4066Sahrens 1681ab7f2deSmaybee mutex_init(&dp->dp_lock, NULL, MUTEX_DEFAULT, NULL); 16969962b56SMatthew Ahrens cv_init(&dp->dp_spaceavail_cv, NULL, CV_DEFAULT, NULL); 1701ab7f2deSmaybee 1719d3574bfSNeil Perrin dp->dp_vnrele_taskq = taskq_create("zfs_vn_rele_taskq", 1, minclsyspri, 1729d3574bfSNeil Perrin 1, 4, 0); 1739d3574bfSNeil Perrin 174fa9e4066Sahrens return (dp); 175fa9e4066Sahrens } 176fa9e4066Sahrens 177ea8dc4b6Seschrock int 178ad135b5dSChristopher Siden dsl_pool_init(spa_t *spa, uint64_t txg, dsl_pool_t **dpp) 179fa9e4066Sahrens { 180fa9e4066Sahrens int err; 181fa9e4066Sahrens dsl_pool_t *dp = dsl_pool_open_impl(spa, txg); 182ad135b5dSChristopher Siden 183ad135b5dSChristopher Siden err = dmu_objset_open_impl(spa, NULL, &dp->dp_meta_rootbp, 184ad135b5dSChristopher Siden &dp->dp_meta_objset); 185ad135b5dSChristopher Siden if (err != 0) 186ad135b5dSChristopher Siden dsl_pool_close(dp); 187ad135b5dSChristopher Siden else 188ad135b5dSChristopher Siden *dpp = dp; 189ad135b5dSChristopher Siden 190ad135b5dSChristopher Siden return (err); 191ad135b5dSChristopher Siden } 192ad135b5dSChristopher Siden 193ad135b5dSChristopher Siden int 194ad135b5dSChristopher Siden dsl_pool_open(dsl_pool_t *dp) 195ad135b5dSChristopher Siden { 196ad135b5dSChristopher Siden int err; 197088f3894Sahrens dsl_dir_t *dd; 198088f3894Sahrens dsl_dataset_t *ds; 199cde58dbcSMatthew Ahrens uint64_t obj; 200fa9e4066Sahrens 2013b2aab18SMatthew Ahrens rrw_enter(&dp->dp_config_rwlock, RW_WRITER, FTAG); 202fa9e4066Sahrens err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, 203fa9e4066Sahrens DMU_POOL_ROOT_DATASET, sizeof (uint64_t), 1, 204fa9e4066Sahrens &dp->dp_root_dir_obj); 205ea8dc4b6Seschrock if (err) 206ea8dc4b6Seschrock goto out; 207ea8dc4b6Seschrock 2083b2aab18SMatthew Ahrens err = dsl_dir_hold_obj(dp, dp->dp_root_dir_obj, 209ea8dc4b6Seschrock NULL, dp, &dp->dp_root_dir); 210ea8dc4b6Seschrock if (err) 211ea8dc4b6Seschrock goto out; 212fa9e4066Sahrens 213088f3894Sahrens err = dsl_pool_open_special_dir(dp, MOS_DIR_NAME, &dp->dp_mos_dir); 214ea8dc4b6Seschrock if (err) 215ea8dc4b6Seschrock goto out; 216ea8dc4b6Seschrock 217ad135b5dSChristopher Siden if (spa_version(dp->dp_spa) >= SPA_VERSION_ORIGIN) { 218088f3894Sahrens err = dsl_pool_open_special_dir(dp, ORIGIN_DIR_NAME, &dd); 219088f3894Sahrens if (err) 220088f3894Sahrens goto out; 221c1379625SJustin T. Gibbs err = dsl_dataset_hold_obj(dp, 222c1379625SJustin T. Gibbs dsl_dir_phys(dd)->dd_head_dataset_obj, FTAG, &ds); 2238f63aa46SLin Ling if (err == 0) { 2248f63aa46SLin Ling err = dsl_dataset_hold_obj(dp, 225c1379625SJustin T. Gibbs dsl_dataset_phys(ds)->ds_prev_snap_obj, dp, 2268f63aa46SLin Ling &dp->dp_origin_snap); 2278f63aa46SLin Ling dsl_dataset_rele(ds, FTAG); 2288f63aa46SLin Ling } 2293b2aab18SMatthew Ahrens dsl_dir_rele(dd, dp); 230088f3894Sahrens if (err) 231088f3894Sahrens goto out; 232088f3894Sahrens } 233088f3894Sahrens 234ad135b5dSChristopher Siden if (spa_version(dp->dp_spa) >= SPA_VERSION_DEADLISTS) { 235cde58dbcSMatthew Ahrens err = dsl_pool_open_special_dir(dp, FREE_DIR_NAME, 236cde58dbcSMatthew Ahrens &dp->dp_free_dir); 237cde58dbcSMatthew Ahrens if (err) 238cde58dbcSMatthew Ahrens goto out; 239cde58dbcSMatthew Ahrens 240cde58dbcSMatthew Ahrens err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, 241cde58dbcSMatthew Ahrens DMU_POOL_FREE_BPOBJ, sizeof (uint64_t), 1, &obj); 242cde58dbcSMatthew Ahrens if (err) 243cde58dbcSMatthew Ahrens goto out; 2443b2aab18SMatthew Ahrens VERIFY0(bpobj_open(&dp->dp_free_bpobj, 245cde58dbcSMatthew Ahrens dp->dp_meta_objset, obj)); 246cde58dbcSMatthew Ahrens } 247cde58dbcSMatthew Ahrens 2487fd05ac4SMatthew Ahrens /* 2497fd05ac4SMatthew Ahrens * Note: errors ignored, because the leak dir will not exist if we 2507fd05ac4SMatthew Ahrens * have not encountered a leak yet. 2517fd05ac4SMatthew Ahrens */ 2527fd05ac4SMatthew Ahrens (void) dsl_pool_open_special_dir(dp, LEAK_DIR_NAME, 2537fd05ac4SMatthew Ahrens &dp->dp_leak_dir); 2547fd05ac4SMatthew Ahrens 2552acef22dSMatthew Ahrens if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_ASYNC_DESTROY)) { 256ad135b5dSChristopher Siden err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, 257ad135b5dSChristopher Siden DMU_POOL_BPTREE_OBJ, sizeof (uint64_t), 1, 258ad135b5dSChristopher Siden &dp->dp_bptree_obj); 259ad135b5dSChristopher Siden if (err != 0) 260ad135b5dSChristopher Siden goto out; 261ad135b5dSChristopher Siden } 262ad135b5dSChristopher Siden 2632acef22dSMatthew Ahrens if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_EMPTY_BPOBJ)) { 264f1745736SMatthew Ahrens err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, 265f1745736SMatthew Ahrens DMU_POOL_EMPTY_BPOBJ, sizeof (uint64_t), 1, 266f1745736SMatthew Ahrens &dp->dp_empty_bpobj); 267f1745736SMatthew Ahrens if (err != 0) 268f1745736SMatthew Ahrens goto out; 269f1745736SMatthew Ahrens } 270f1745736SMatthew Ahrens 271ca45db41SChris Kirby err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, 272ca45db41SChris Kirby DMU_POOL_TMP_USERREFS, sizeof (uint64_t), 1, 273ca45db41SChris Kirby &dp->dp_tmp_userrefs_obj); 274ca45db41SChris Kirby if (err == ENOENT) 275ca45db41SChris Kirby err = 0; 276ca45db41SChris Kirby if (err) 277ca45db41SChris Kirby goto out; 278ca45db41SChris Kirby 279ad135b5dSChristopher Siden err = dsl_scan_init(dp, dp->dp_tx.tx_open_txg); 280088f3894Sahrens 281ea8dc4b6Seschrock out: 2823b2aab18SMatthew Ahrens rrw_exit(&dp->dp_config_rwlock, FTAG); 283ea8dc4b6Seschrock return (err); 284fa9e4066Sahrens } 285fa9e4066Sahrens 286fa9e4066Sahrens void 287fa9e4066Sahrens dsl_pool_close(dsl_pool_t *dp) 288fa9e4066Sahrens { 289088f3894Sahrens /* 29069962b56SMatthew Ahrens * Drop our references from dsl_pool_open(). 29169962b56SMatthew Ahrens * 292088f3894Sahrens * Since we held the origin_snap from "syncing" context (which 293088f3894Sahrens * includes pool-opening context), it actually only got a "ref" 294088f3894Sahrens * and not a hold, so just drop that here. 295088f3894Sahrens */ 296088f3894Sahrens if (dp->dp_origin_snap) 2973b2aab18SMatthew Ahrens dsl_dataset_rele(dp->dp_origin_snap, dp); 298ea8dc4b6Seschrock if (dp->dp_mos_dir) 2993b2aab18SMatthew Ahrens dsl_dir_rele(dp->dp_mos_dir, dp); 300cde58dbcSMatthew Ahrens if (dp->dp_free_dir) 3013b2aab18SMatthew Ahrens dsl_dir_rele(dp->dp_free_dir, dp); 3027fd05ac4SMatthew Ahrens if (dp->dp_leak_dir) 3037fd05ac4SMatthew Ahrens dsl_dir_rele(dp->dp_leak_dir, dp); 304ea8dc4b6Seschrock if (dp->dp_root_dir) 3053b2aab18SMatthew Ahrens dsl_dir_rele(dp->dp_root_dir, dp); 306fa9e4066Sahrens 307cde58dbcSMatthew Ahrens bpobj_close(&dp->dp_free_bpobj); 308cde58dbcSMatthew Ahrens 309fa9e4066Sahrens /* undo the dmu_objset_open_impl(mos) from dsl_pool_open() */ 310ea8dc4b6Seschrock if (dp->dp_meta_objset) 311503ad85cSMatthew Ahrens dmu_objset_evict(dp->dp_meta_objset); 312fa9e4066Sahrens 313fa9e4066Sahrens txg_list_destroy(&dp->dp_dirty_datasets); 314ce636f8bSMatthew Ahrens txg_list_destroy(&dp->dp_dirty_zilogs); 31554a91118SChris Kirby txg_list_destroy(&dp->dp_sync_tasks); 316fa9e4066Sahrens txg_list_destroy(&dp->dp_dirty_dirs); 317fa9e4066Sahrens 318*244781f1SPrakash Surya /* 319*244781f1SPrakash Surya * We can't set retry to TRUE since we're explicitly specifying 320*244781f1SPrakash Surya * a spa to flush. This is good enough; any missed buffers for 321*244781f1SPrakash Surya * this spa won't cause trouble, and they'll eventually fall 322*244781f1SPrakash Surya * out of the ARC just like any other unused buffer. 323*244781f1SPrakash Surya */ 324*244781f1SPrakash Surya arc_flush(dp->dp_spa, FALSE); 325*244781f1SPrakash Surya 326fa9e4066Sahrens txg_fini(dp); 3273f9d6ad7SLin Ling dsl_scan_fini(dp); 328bc9014e6SJustin Gibbs dmu_buf_user_evict_wait(); 329bc9014e6SJustin Gibbs 3303b2aab18SMatthew Ahrens rrw_destroy(&dp->dp_config_rwlock); 3311ab7f2deSmaybee mutex_destroy(&dp->dp_lock); 3329d3574bfSNeil Perrin taskq_destroy(dp->dp_vnrele_taskq); 33388b7b0f2SMatthew Ahrens if (dp->dp_blkstats) 33488b7b0f2SMatthew Ahrens kmem_free(dp->dp_blkstats, sizeof (zfs_all_blkstats_t)); 335fa9e4066Sahrens kmem_free(dp, sizeof (dsl_pool_t)); 336fa9e4066Sahrens } 337fa9e4066Sahrens 338fa9e4066Sahrens dsl_pool_t * 3390a48a24eStimh dsl_pool_create(spa_t *spa, nvlist_t *zplprops, uint64_t txg) 340fa9e4066Sahrens { 341fa9e4066Sahrens int err; 342fa9e4066Sahrens dsl_pool_t *dp = dsl_pool_open_impl(spa, txg); 343fa9e4066Sahrens dmu_tx_t *tx = dmu_tx_create_assigned(dp, txg); 344503ad85cSMatthew Ahrens objset_t *os; 345088f3894Sahrens dsl_dataset_t *ds; 346cde58dbcSMatthew Ahrens uint64_t obj; 347088f3894Sahrens 3483b2aab18SMatthew Ahrens rrw_enter(&dp->dp_config_rwlock, RW_WRITER, FTAG); 3493b2aab18SMatthew Ahrens 350088f3894Sahrens /* create and open the MOS (meta-objset) */ 351503ad85cSMatthew Ahrens dp->dp_meta_objset = dmu_objset_create_impl(spa, 352503ad85cSMatthew Ahrens NULL, &dp->dp_meta_rootbp, DMU_OST_META, tx); 353fa9e4066Sahrens 354fa9e4066Sahrens /* create the pool directory */ 355fa9e4066Sahrens err = zap_create_claim(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, 356fa9e4066Sahrens DMU_OT_OBJECT_DIRECTORY, DMU_OT_NONE, 0, tx); 357fb09f5aaSMadhav Suresh ASSERT0(err); 358fa9e4066Sahrens 3593f9d6ad7SLin Ling /* Initialize scan structures */ 3603b2aab18SMatthew Ahrens VERIFY0(dsl_scan_init(dp, txg)); 3613f9d6ad7SLin Ling 362fa9e4066Sahrens /* create and open the root dir */ 363088f3894Sahrens dp->dp_root_dir_obj = dsl_dir_create_sync(dp, NULL, NULL, tx); 3643b2aab18SMatthew Ahrens VERIFY0(dsl_dir_hold_obj(dp, dp->dp_root_dir_obj, 365ea8dc4b6Seschrock NULL, dp, &dp->dp_root_dir)); 366fa9e4066Sahrens 367fa9e4066Sahrens /* create and open the meta-objset dir */ 368088f3894Sahrens (void) dsl_dir_create_sync(dp, dp->dp_root_dir, MOS_DIR_NAME, tx); 3693b2aab18SMatthew Ahrens VERIFY0(dsl_pool_open_special_dir(dp, 370088f3894Sahrens MOS_DIR_NAME, &dp->dp_mos_dir)); 371088f3894Sahrens 372cde58dbcSMatthew Ahrens if (spa_version(spa) >= SPA_VERSION_DEADLISTS) { 373cde58dbcSMatthew Ahrens /* create and open the free dir */ 374cde58dbcSMatthew Ahrens (void) dsl_dir_create_sync(dp, dp->dp_root_dir, 375cde58dbcSMatthew Ahrens FREE_DIR_NAME, tx); 3763b2aab18SMatthew Ahrens VERIFY0(dsl_pool_open_special_dir(dp, 377cde58dbcSMatthew Ahrens FREE_DIR_NAME, &dp->dp_free_dir)); 378cde58dbcSMatthew Ahrens 379cde58dbcSMatthew Ahrens /* create and open the free_bplist */ 380b5152584SMatthew Ahrens obj = bpobj_alloc(dp->dp_meta_objset, SPA_OLD_MAXBLOCKSIZE, tx); 381cde58dbcSMatthew Ahrens VERIFY(zap_add(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, 382cde58dbcSMatthew Ahrens DMU_POOL_FREE_BPOBJ, sizeof (uint64_t), 1, &obj, tx) == 0); 3833b2aab18SMatthew Ahrens VERIFY0(bpobj_open(&dp->dp_free_bpobj, 384cde58dbcSMatthew Ahrens dp->dp_meta_objset, obj)); 385cde58dbcSMatthew Ahrens } 386cde58dbcSMatthew Ahrens 387088f3894Sahrens if (spa_version(spa) >= SPA_VERSION_DSL_SCRUB) 388088f3894Sahrens dsl_pool_create_origin(dp, tx); 389088f3894Sahrens 390088f3894Sahrens /* create the root dataset */ 391cde58dbcSMatthew Ahrens obj = dsl_dataset_create_sync_dd(dp->dp_root_dir, NULL, 0, tx); 392088f3894Sahrens 393088f3894Sahrens /* create the root objset */ 3943b2aab18SMatthew Ahrens VERIFY0(dsl_dataset_hold_obj(dp, obj, FTAG, &ds)); 395503ad85cSMatthew Ahrens os = dmu_objset_create_impl(dp->dp_spa, ds, 396088f3894Sahrens dsl_dataset_get_blkptr(ds), DMU_OST_ZFS, tx); 397088f3894Sahrens #ifdef _KERNEL 398503ad85cSMatthew Ahrens zfs_create_fs(os, kcred, zplprops, tx); 399088f3894Sahrens #endif 400088f3894Sahrens dsl_dataset_rele(ds, FTAG); 401fa9e4066Sahrens 402fa9e4066Sahrens dmu_tx_commit(tx); 403fa9e4066Sahrens 4043b2aab18SMatthew Ahrens rrw_exit(&dp->dp_config_rwlock, FTAG); 4053b2aab18SMatthew Ahrens 406fa9e4066Sahrens return (dp); 407fa9e4066Sahrens } 408fa9e4066Sahrens 409ce636f8bSMatthew Ahrens /* 410ce636f8bSMatthew Ahrens * Account for the meta-objset space in its placeholder dsl_dir. 411ce636f8bSMatthew Ahrens */ 412ce636f8bSMatthew Ahrens void 413ce636f8bSMatthew Ahrens dsl_pool_mos_diduse_space(dsl_pool_t *dp, 414ce636f8bSMatthew Ahrens int64_t used, int64_t comp, int64_t uncomp) 415ce636f8bSMatthew Ahrens { 416ce636f8bSMatthew Ahrens ASSERT3U(comp, ==, uncomp); /* it's all metadata */ 417ce636f8bSMatthew Ahrens mutex_enter(&dp->dp_lock); 418ce636f8bSMatthew Ahrens dp->dp_mos_used_delta += used; 419ce636f8bSMatthew Ahrens dp->dp_mos_compressed_delta += comp; 420ce636f8bSMatthew Ahrens dp->dp_mos_uncompressed_delta += uncomp; 421ce636f8bSMatthew Ahrens mutex_exit(&dp->dp_lock); 422ce636f8bSMatthew Ahrens } 423ce636f8bSMatthew Ahrens 424cde58dbcSMatthew Ahrens static int 425cde58dbcSMatthew Ahrens deadlist_enqueue_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx) 426cde58dbcSMatthew Ahrens { 427cde58dbcSMatthew Ahrens dsl_deadlist_t *dl = arg; 428cde58dbcSMatthew Ahrens dsl_deadlist_insert(dl, bp, tx); 429cde58dbcSMatthew Ahrens return (0); 430cde58dbcSMatthew Ahrens } 431cde58dbcSMatthew Ahrens 43269962b56SMatthew Ahrens static void 43369962b56SMatthew Ahrens dsl_pool_sync_mos(dsl_pool_t *dp, dmu_tx_t *tx) 43469962b56SMatthew Ahrens { 43569962b56SMatthew Ahrens zio_t *zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED); 43669962b56SMatthew Ahrens dmu_objset_sync(dp->dp_meta_objset, zio, tx); 43769962b56SMatthew Ahrens VERIFY0(zio_wait(zio)); 43869962b56SMatthew Ahrens dprintf_bp(&dp->dp_meta_rootbp, "meta objset rootbp is %s", ""); 43969962b56SMatthew Ahrens spa_set_rootblkptr(dp->dp_spa, &dp->dp_meta_rootbp); 44069962b56SMatthew Ahrens } 44169962b56SMatthew Ahrens 44269962b56SMatthew Ahrens static void 44369962b56SMatthew Ahrens dsl_pool_dirty_delta(dsl_pool_t *dp, int64_t delta) 44469962b56SMatthew Ahrens { 44569962b56SMatthew Ahrens ASSERT(MUTEX_HELD(&dp->dp_lock)); 44669962b56SMatthew Ahrens 44769962b56SMatthew Ahrens if (delta < 0) 44869962b56SMatthew Ahrens ASSERT3U(-delta, <=, dp->dp_dirty_total); 44969962b56SMatthew Ahrens 45069962b56SMatthew Ahrens dp->dp_dirty_total += delta; 45169962b56SMatthew Ahrens 45269962b56SMatthew Ahrens /* 45369962b56SMatthew Ahrens * Note: we signal even when increasing dp_dirty_total. 45469962b56SMatthew Ahrens * This ensures forward progress -- each thread wakes the next waiter. 45569962b56SMatthew Ahrens */ 45669962b56SMatthew Ahrens if (dp->dp_dirty_total <= zfs_dirty_data_max) 45769962b56SMatthew Ahrens cv_signal(&dp->dp_spaceavail_cv); 45869962b56SMatthew Ahrens } 45969962b56SMatthew Ahrens 460fa9e4066Sahrens void 461fa9e4066Sahrens dsl_pool_sync(dsl_pool_t *dp, uint64_t txg) 462fa9e4066Sahrens { 463c717a561Smaybee zio_t *zio; 464fa9e4066Sahrens dmu_tx_t *tx; 465c717a561Smaybee dsl_dir_t *dd; 466c717a561Smaybee dsl_dataset_t *ds; 467503ad85cSMatthew Ahrens objset_t *mos = dp->dp_meta_objset; 468ce636f8bSMatthew Ahrens list_t synced_datasets; 469ce636f8bSMatthew Ahrens 470ce636f8bSMatthew Ahrens list_create(&synced_datasets, sizeof (dsl_dataset_t), 471ce636f8bSMatthew Ahrens offsetof(dsl_dataset_t, ds_synced_link)); 472fa9e4066Sahrens 473fa9e4066Sahrens tx = dmu_tx_create_assigned(dp, txg); 474fa9e4066Sahrens 47569962b56SMatthew Ahrens /* 47669962b56SMatthew Ahrens * Write out all dirty blocks of dirty datasets. 47769962b56SMatthew Ahrens */ 478c717a561Smaybee zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED); 47969962b56SMatthew Ahrens while ((ds = txg_list_remove(&dp->dp_dirty_datasets, txg)) != NULL) { 48014843421SMatthew Ahrens /* 48114843421SMatthew Ahrens * We must not sync any non-MOS datasets twice, because 48214843421SMatthew Ahrens * we may have taken a snapshot of them. However, we 48314843421SMatthew Ahrens * may sync newly-created datasets on pass 2. 48414843421SMatthew Ahrens */ 48514843421SMatthew Ahrens ASSERT(!list_link_active(&ds->ds_synced_link)); 486ce636f8bSMatthew Ahrens list_insert_tail(&synced_datasets, ds); 487c717a561Smaybee dsl_dataset_sync(ds, zio, tx); 488c717a561Smaybee } 48969962b56SMatthew Ahrens VERIFY0(zio_wait(zio)); 49014843421SMatthew Ahrens 49169962b56SMatthew Ahrens /* 49269962b56SMatthew Ahrens * We have written all of the accounted dirty data, so our 49369962b56SMatthew Ahrens * dp_space_towrite should now be zero. However, some seldom-used 49469962b56SMatthew Ahrens * code paths do not adhere to this (e.g. dbuf_undirty(), also 49569962b56SMatthew Ahrens * rounding error in dbuf_write_physdone). 49669962b56SMatthew Ahrens * Shore up the accounting of any dirtied space now. 49769962b56SMatthew Ahrens */ 49869962b56SMatthew Ahrens dsl_pool_undirty_space(dp, dp->dp_dirty_pertxg[txg & TXG_MASK], txg); 499c717a561Smaybee 500ce636f8bSMatthew Ahrens /* 501ce636f8bSMatthew Ahrens * After the data blocks have been written (ensured by the zio_wait() 502ce636f8bSMatthew Ahrens * above), update the user/group space accounting. 503ce636f8bSMatthew Ahrens */ 50469962b56SMatthew Ahrens for (ds = list_head(&synced_datasets); ds != NULL; 50569962b56SMatthew Ahrens ds = list_next(&synced_datasets, ds)) { 5060a586ceaSMark Shellenbaum dmu_objset_do_userquota_updates(ds->ds_objset, tx); 50769962b56SMatthew Ahrens } 50814843421SMatthew Ahrens 50914843421SMatthew Ahrens /* 51014843421SMatthew Ahrens * Sync the datasets again to push out the changes due to 5113f9d6ad7SLin Ling * userspace updates. This must be done before we process the 512ce636f8bSMatthew Ahrens * sync tasks, so that any snapshots will have the correct 513ce636f8bSMatthew Ahrens * user accounting information (and we won't get confused 514ce636f8bSMatthew Ahrens * about which blocks are part of the snapshot). 51514843421SMatthew Ahrens */ 51614843421SMatthew Ahrens zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED); 51769962b56SMatthew Ahrens while ((ds = txg_list_remove(&dp->dp_dirty_datasets, txg)) != NULL) { 51814843421SMatthew Ahrens ASSERT(list_link_active(&ds->ds_synced_link)); 51914843421SMatthew Ahrens dmu_buf_rele(ds->ds_dbuf, ds); 52014843421SMatthew Ahrens dsl_dataset_sync(ds, zio, tx); 52114843421SMatthew Ahrens } 52269962b56SMatthew Ahrens VERIFY0(zio_wait(zio)); 52314843421SMatthew Ahrens 524b24ab676SJeff Bonwick /* 525ce636f8bSMatthew Ahrens * Now that the datasets have been completely synced, we can 526ce636f8bSMatthew Ahrens * clean up our in-memory structures accumulated while syncing: 527ce636f8bSMatthew Ahrens * 528ce636f8bSMatthew Ahrens * - move dead blocks from the pending deadlist to the on-disk deadlist 529ce636f8bSMatthew Ahrens * - release hold from dsl_dataset_dirty() 530b24ab676SJeff Bonwick */ 53169962b56SMatthew Ahrens while ((ds = list_remove_head(&synced_datasets)) != NULL) { 532ce636f8bSMatthew Ahrens objset_t *os = ds->ds_objset; 533cde58dbcSMatthew Ahrens bplist_iterate(&ds->ds_pending_deadlist, 534cde58dbcSMatthew Ahrens deadlist_enqueue_cb, &ds->ds_deadlist, tx); 535ce636f8bSMatthew Ahrens ASSERT(!dmu_objset_is_dirty(os, txg)); 536ce636f8bSMatthew Ahrens dmu_buf_rele(ds->ds_dbuf, ds); 537cde58dbcSMatthew Ahrens } 53869962b56SMatthew Ahrens while ((dd = txg_list_remove(&dp->dp_dirty_dirs, txg)) != NULL) { 539c717a561Smaybee dsl_dir_sync(dd, tx); 54069962b56SMatthew Ahrens } 541fa9e4066Sahrens 542ce636f8bSMatthew Ahrens /* 543ce636f8bSMatthew Ahrens * The MOS's space is accounted for in the pool/$MOS 544ce636f8bSMatthew Ahrens * (dp_mos_dir). We can't modify the mos while we're syncing 545ce636f8bSMatthew Ahrens * it, so we remember the deltas and apply them here. 546ce636f8bSMatthew Ahrens */ 547ce636f8bSMatthew Ahrens if (dp->dp_mos_used_delta != 0 || dp->dp_mos_compressed_delta != 0 || 548ce636f8bSMatthew Ahrens dp->dp_mos_uncompressed_delta != 0) { 549ce636f8bSMatthew Ahrens dsl_dir_diduse_space(dp->dp_mos_dir, DD_USED_HEAD, 550ce636f8bSMatthew Ahrens dp->dp_mos_used_delta, 551ce636f8bSMatthew Ahrens dp->dp_mos_compressed_delta, 552ce636f8bSMatthew Ahrens dp->dp_mos_uncompressed_delta, tx); 553ce636f8bSMatthew Ahrens dp->dp_mos_used_delta = 0; 554ce636f8bSMatthew Ahrens dp->dp_mos_compressed_delta = 0; 555ce636f8bSMatthew Ahrens dp->dp_mos_uncompressed_delta = 0; 556ce636f8bSMatthew Ahrens } 557ce636f8bSMatthew Ahrens 558503ad85cSMatthew Ahrens if (list_head(&mos->os_dirty_dnodes[txg & TXG_MASK]) != NULL || 559503ad85cSMatthew Ahrens list_head(&mos->os_free_dnodes[txg & TXG_MASK]) != NULL) { 56069962b56SMatthew Ahrens dsl_pool_sync_mos(dp, tx); 561fa9e4066Sahrens } 562fa9e4066Sahrens 563ce636f8bSMatthew Ahrens /* 564ce636f8bSMatthew Ahrens * If we modify a dataset in the same txg that we want to destroy it, 565ce636f8bSMatthew Ahrens * its dsl_dir's dd_dbuf will be dirty, and thus have a hold on it. 566ce636f8bSMatthew Ahrens * dsl_dir_destroy_check() will fail if there are unexpected holds. 567ce636f8bSMatthew Ahrens * Therefore, we want to sync the MOS (thus syncing the dd_dbuf 568ce636f8bSMatthew Ahrens * and clearing the hold on it) before we process the sync_tasks. 569ce636f8bSMatthew Ahrens * The MOS data dirtied by the sync_tasks will be synced on the next 570ce636f8bSMatthew Ahrens * pass. 571ce636f8bSMatthew Ahrens */ 572ce636f8bSMatthew Ahrens if (!txg_list_empty(&dp->dp_sync_tasks, txg)) { 5733b2aab18SMatthew Ahrens dsl_sync_task_t *dst; 574ce636f8bSMatthew Ahrens /* 575ce636f8bSMatthew Ahrens * No more sync tasks should have been added while we 576ce636f8bSMatthew Ahrens * were syncing. 577ce636f8bSMatthew Ahrens */ 57869962b56SMatthew Ahrens ASSERT3U(spa_sync_pass(dp->dp_spa), ==, 1); 57969962b56SMatthew Ahrens while ((dst = txg_list_remove(&dp->dp_sync_tasks, txg)) != NULL) 5803b2aab18SMatthew Ahrens dsl_sync_task_sync(dst, tx); 581ce636f8bSMatthew Ahrens } 582ce636f8bSMatthew Ahrens 583fa9e4066Sahrens dmu_tx_commit(tx); 58405715f94SMark Maybee 58569962b56SMatthew Ahrens DTRACE_PROBE2(dsl_pool_sync__done, dsl_pool_t *dp, dp, uint64_t, txg); 586fa9e4066Sahrens } 587fa9e4066Sahrens 588fa9e4066Sahrens void 589b24ab676SJeff Bonwick dsl_pool_sync_done(dsl_pool_t *dp, uint64_t txg) 590fa9e4066Sahrens { 591ce636f8bSMatthew Ahrens zilog_t *zilog; 592fa9e4066Sahrens 593ce636f8bSMatthew Ahrens while (zilog = txg_list_remove(&dp->dp_dirty_zilogs, txg)) { 59469962b56SMatthew Ahrens dsl_dataset_t *ds = dmu_objset_ds(zilog->zl_os); 595ce636f8bSMatthew Ahrens zil_clean(zilog, txg); 596ce636f8bSMatthew Ahrens ASSERT(!dmu_objset_is_dirty(zilog->zl_os, txg)); 597ce636f8bSMatthew Ahrens dmu_buf_rele(ds->ds_dbuf, zilog); 598fa9e4066Sahrens } 599b24ab676SJeff Bonwick ASSERT(!dmu_objset_is_dirty(dp->dp_meta_objset, txg)); 600fa9e4066Sahrens } 601fa9e4066Sahrens 602c717a561Smaybee /* 603c717a561Smaybee * TRUE if the current thread is the tx_sync_thread or if we 604c717a561Smaybee * are being called from SPA context during pool initialization. 605c717a561Smaybee */ 606fa9e4066Sahrens int 607fa9e4066Sahrens dsl_pool_sync_context(dsl_pool_t *dp) 608fa9e4066Sahrens { 609fa9e4066Sahrens return (curthread == dp->dp_tx.tx_sync_thread || 610ad135b5dSChristopher Siden spa_is_initializing(dp->dp_spa)); 611fa9e4066Sahrens } 612fa9e4066Sahrens 613fa9e4066Sahrens uint64_t 614fa9e4066Sahrens dsl_pool_adjustedsize(dsl_pool_t *dp, boolean_t netfree) 615fa9e4066Sahrens { 616fa9e4066Sahrens uint64_t space, resv; 617fa9e4066Sahrens 618fa9e4066Sahrens /* 619fa9e4066Sahrens * If we're trying to assess whether it's OK to do a free, 620fa9e4066Sahrens * cut the reservation in half to allow forward progress 621fa9e4066Sahrens * (e.g. make it possible to rm(1) files from a full pool). 622fa9e4066Sahrens */ 623485bbbf5SGeorge Wilson space = spa_get_dspace(dp->dp_spa); 624c39f2c8cSChristopher Siden resv = spa_get_slop_space(dp->dp_spa); 625fa9e4066Sahrens if (netfree) 626fa9e4066Sahrens resv >>= 1; 627fa9e4066Sahrens 628fa9e4066Sahrens return (space - resv); 629fa9e4066Sahrens } 6301ab7f2deSmaybee 63169962b56SMatthew Ahrens boolean_t 63269962b56SMatthew Ahrens dsl_pool_need_dirty_delay(dsl_pool_t *dp) 6331ab7f2deSmaybee { 63469962b56SMatthew Ahrens uint64_t delay_min_bytes = 63569962b56SMatthew Ahrens zfs_dirty_data_max * zfs_delay_min_dirty_percent / 100; 63669962b56SMatthew Ahrens boolean_t rv; 6371ab7f2deSmaybee 63869962b56SMatthew Ahrens mutex_enter(&dp->dp_lock); 63969962b56SMatthew Ahrens if (dp->dp_dirty_total > zfs_dirty_data_sync) 64069962b56SMatthew Ahrens txg_kick(dp); 64169962b56SMatthew Ahrens rv = (dp->dp_dirty_total > delay_min_bytes); 64269962b56SMatthew Ahrens mutex_exit(&dp->dp_lock); 64369962b56SMatthew Ahrens return (rv); 6441ab7f2deSmaybee } 6451ab7f2deSmaybee 6461ab7f2deSmaybee void 64769962b56SMatthew Ahrens dsl_pool_dirty_space(dsl_pool_t *dp, int64_t space, dmu_tx_t *tx) 6481ab7f2deSmaybee { 64969962b56SMatthew Ahrens if (space > 0) { 65069962b56SMatthew Ahrens mutex_enter(&dp->dp_lock); 65169962b56SMatthew Ahrens dp->dp_dirty_pertxg[tx->tx_txg & TXG_MASK] += space; 65269962b56SMatthew Ahrens dsl_pool_dirty_delta(dp, space); 65369962b56SMatthew Ahrens mutex_exit(&dp->dp_lock); 6541ab7f2deSmaybee } 6551ab7f2deSmaybee } 6561ab7f2deSmaybee 6571ab7f2deSmaybee void 65869962b56SMatthew Ahrens dsl_pool_undirty_space(dsl_pool_t *dp, int64_t space, uint64_t txg) 6591ab7f2deSmaybee { 66069962b56SMatthew Ahrens ASSERT3S(space, >=, 0); 66169962b56SMatthew Ahrens if (space == 0) 66269962b56SMatthew Ahrens return; 66369962b56SMatthew Ahrens mutex_enter(&dp->dp_lock); 66469962b56SMatthew Ahrens if (dp->dp_dirty_pertxg[txg & TXG_MASK] < space) { 66569962b56SMatthew Ahrens /* XXX writing something we didn't dirty? */ 66669962b56SMatthew Ahrens space = dp->dp_dirty_pertxg[txg & TXG_MASK]; 6671ab7f2deSmaybee } 66869962b56SMatthew Ahrens ASSERT3U(dp->dp_dirty_pertxg[txg & TXG_MASK], >=, space); 66969962b56SMatthew Ahrens dp->dp_dirty_pertxg[txg & TXG_MASK] -= space; 67069962b56SMatthew Ahrens ASSERT3U(dp->dp_dirty_total, >=, space); 67169962b56SMatthew Ahrens dsl_pool_dirty_delta(dp, -space); 67269962b56SMatthew Ahrens mutex_exit(&dp->dp_lock); 6731ab7f2deSmaybee } 674088f3894Sahrens 675088f3894Sahrens /* ARGSUSED */ 676088f3894Sahrens static int 6773b2aab18SMatthew Ahrens upgrade_clones_cb(dsl_pool_t *dp, dsl_dataset_t *hds, void *arg) 678088f3894Sahrens { 679088f3894Sahrens dmu_tx_t *tx = arg; 680088f3894Sahrens dsl_dataset_t *ds, *prev = NULL; 681088f3894Sahrens int err; 682088f3894Sahrens 6833b2aab18SMatthew Ahrens err = dsl_dataset_hold_obj(dp, hds->ds_object, FTAG, &ds); 684088f3894Sahrens if (err) 685088f3894Sahrens return (err); 686088f3894Sahrens 687c1379625SJustin T. Gibbs while (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { 688c1379625SJustin T. Gibbs err = dsl_dataset_hold_obj(dp, 689c1379625SJustin T. Gibbs dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &prev); 690088f3894Sahrens if (err) { 691088f3894Sahrens dsl_dataset_rele(ds, FTAG); 692088f3894Sahrens return (err); 693088f3894Sahrens } 694088f3894Sahrens 695c1379625SJustin T. Gibbs if (dsl_dataset_phys(prev)->ds_next_snap_obj != ds->ds_object) 696088f3894Sahrens break; 697088f3894Sahrens dsl_dataset_rele(ds, FTAG); 698088f3894Sahrens ds = prev; 699088f3894Sahrens prev = NULL; 700088f3894Sahrens } 701088f3894Sahrens 702088f3894Sahrens if (prev == NULL) { 703088f3894Sahrens prev = dp->dp_origin_snap; 704088f3894Sahrens 705088f3894Sahrens /* 706088f3894Sahrens * The $ORIGIN can't have any data, or the accounting 707088f3894Sahrens * will be wrong. 708088f3894Sahrens */ 709c1379625SJustin T. Gibbs ASSERT0(dsl_dataset_phys(prev)->ds_bp.blk_birth); 710088f3894Sahrens 711088f3894Sahrens /* The origin doesn't get attached to itself */ 712088f3894Sahrens if (ds->ds_object == prev->ds_object) { 713088f3894Sahrens dsl_dataset_rele(ds, FTAG); 714088f3894Sahrens return (0); 715088f3894Sahrens } 716088f3894Sahrens 717088f3894Sahrens dmu_buf_will_dirty(ds->ds_dbuf, tx); 718c1379625SJustin T. Gibbs dsl_dataset_phys(ds)->ds_prev_snap_obj = prev->ds_object; 719c1379625SJustin T. Gibbs dsl_dataset_phys(ds)->ds_prev_snap_txg = 720c1379625SJustin T. Gibbs dsl_dataset_phys(prev)->ds_creation_txg; 721088f3894Sahrens 722088f3894Sahrens dmu_buf_will_dirty(ds->ds_dir->dd_dbuf, tx); 723c1379625SJustin T. Gibbs dsl_dir_phys(ds->ds_dir)->dd_origin_obj = prev->ds_object; 724088f3894Sahrens 725088f3894Sahrens dmu_buf_will_dirty(prev->ds_dbuf, tx); 726c1379625SJustin T. Gibbs dsl_dataset_phys(prev)->ds_num_children++; 727088f3894Sahrens 728c1379625SJustin T. Gibbs if (dsl_dataset_phys(ds)->ds_next_snap_obj == 0) { 729088f3894Sahrens ASSERT(ds->ds_prev == NULL); 7303b2aab18SMatthew Ahrens VERIFY0(dsl_dataset_hold_obj(dp, 731c1379625SJustin T. Gibbs dsl_dataset_phys(ds)->ds_prev_snap_obj, 732c1379625SJustin T. Gibbs ds, &ds->ds_prev)); 733088f3894Sahrens } 734088f3894Sahrens } 735088f3894Sahrens 736c1379625SJustin T. Gibbs ASSERT3U(dsl_dir_phys(ds->ds_dir)->dd_origin_obj, ==, prev->ds_object); 737c1379625SJustin T. Gibbs ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_obj, ==, prev->ds_object); 738088f3894Sahrens 739c1379625SJustin T. Gibbs if (dsl_dataset_phys(prev)->ds_next_clones_obj == 0) { 740c33e334fSMatthew Ahrens dmu_buf_will_dirty(prev->ds_dbuf, tx); 741c1379625SJustin T. Gibbs dsl_dataset_phys(prev)->ds_next_clones_obj = 742088f3894Sahrens zap_create(dp->dp_meta_objset, 743088f3894Sahrens DMU_OT_NEXT_CLONES, DMU_OT_NONE, 0, tx); 744088f3894Sahrens } 7453b2aab18SMatthew Ahrens VERIFY0(zap_add_int(dp->dp_meta_objset, 746c1379625SJustin T. Gibbs dsl_dataset_phys(prev)->ds_next_clones_obj, ds->ds_object, tx)); 747088f3894Sahrens 748088f3894Sahrens dsl_dataset_rele(ds, FTAG); 749088f3894Sahrens if (prev != dp->dp_origin_snap) 750088f3894Sahrens dsl_dataset_rele(prev, FTAG); 751088f3894Sahrens return (0); 752088f3894Sahrens } 753088f3894Sahrens 754088f3894Sahrens void 755088f3894Sahrens dsl_pool_upgrade_clones(dsl_pool_t *dp, dmu_tx_t *tx) 756088f3894Sahrens { 757088f3894Sahrens ASSERT(dmu_tx_is_syncing(tx)); 758088f3894Sahrens ASSERT(dp->dp_origin_snap != NULL); 759088f3894Sahrens 7603b2aab18SMatthew Ahrens VERIFY0(dmu_objset_find_dp(dp, dp->dp_root_dir_obj, upgrade_clones_cb, 761c33e334fSMatthew Ahrens tx, DS_FIND_CHILDREN)); 762088f3894Sahrens } 763088f3894Sahrens 764cde58dbcSMatthew Ahrens /* ARGSUSED */ 765cde58dbcSMatthew Ahrens static int 7663b2aab18SMatthew Ahrens upgrade_dir_clones_cb(dsl_pool_t *dp, dsl_dataset_t *ds, void *arg) 767cde58dbcSMatthew Ahrens { 768cde58dbcSMatthew Ahrens dmu_tx_t *tx = arg; 769cde58dbcSMatthew Ahrens objset_t *mos = dp->dp_meta_objset; 770cde58dbcSMatthew Ahrens 771c1379625SJustin T. Gibbs if (dsl_dir_phys(ds->ds_dir)->dd_origin_obj != 0) { 772cde58dbcSMatthew Ahrens dsl_dataset_t *origin; 773cde58dbcSMatthew Ahrens 7743b2aab18SMatthew Ahrens VERIFY0(dsl_dataset_hold_obj(dp, 775c1379625SJustin T. Gibbs dsl_dir_phys(ds->ds_dir)->dd_origin_obj, FTAG, &origin)); 776cde58dbcSMatthew Ahrens 777c1379625SJustin T. Gibbs if (dsl_dir_phys(origin->ds_dir)->dd_clones == 0) { 778cde58dbcSMatthew Ahrens dmu_buf_will_dirty(origin->ds_dir->dd_dbuf, tx); 779c1379625SJustin T. Gibbs dsl_dir_phys(origin->ds_dir)->dd_clones = 780c1379625SJustin T. Gibbs zap_create(mos, DMU_OT_DSL_CLONES, DMU_OT_NONE, 781c1379625SJustin T. Gibbs 0, tx); 782cde58dbcSMatthew Ahrens } 783cde58dbcSMatthew Ahrens 7843b2aab18SMatthew Ahrens VERIFY0(zap_add_int(dp->dp_meta_objset, 785c1379625SJustin T. Gibbs dsl_dir_phys(origin->ds_dir)->dd_clones, 786c1379625SJustin T. Gibbs ds->ds_object, tx)); 787cde58dbcSMatthew Ahrens 788cde58dbcSMatthew Ahrens dsl_dataset_rele(origin, FTAG); 789cde58dbcSMatthew Ahrens } 790cde58dbcSMatthew Ahrens return (0); 791cde58dbcSMatthew Ahrens } 792cde58dbcSMatthew Ahrens 793cde58dbcSMatthew Ahrens void 794cde58dbcSMatthew Ahrens dsl_pool_upgrade_dir_clones(dsl_pool_t *dp, dmu_tx_t *tx) 795cde58dbcSMatthew Ahrens { 796cde58dbcSMatthew Ahrens ASSERT(dmu_tx_is_syncing(tx)); 797cde58dbcSMatthew Ahrens uint64_t obj; 798cde58dbcSMatthew Ahrens 799cde58dbcSMatthew Ahrens (void) dsl_dir_create_sync(dp, dp->dp_root_dir, FREE_DIR_NAME, tx); 8003b2aab18SMatthew Ahrens VERIFY0(dsl_pool_open_special_dir(dp, 801cde58dbcSMatthew Ahrens FREE_DIR_NAME, &dp->dp_free_dir)); 802cde58dbcSMatthew Ahrens 803cde58dbcSMatthew Ahrens /* 804cde58dbcSMatthew Ahrens * We can't use bpobj_alloc(), because spa_version() still 805cde58dbcSMatthew Ahrens * returns the old version, and we need a new-version bpobj with 806cde58dbcSMatthew Ahrens * subobj support. So call dmu_object_alloc() directly. 807cde58dbcSMatthew Ahrens */ 808cde58dbcSMatthew Ahrens obj = dmu_object_alloc(dp->dp_meta_objset, DMU_OT_BPOBJ, 809b5152584SMatthew Ahrens SPA_OLD_MAXBLOCKSIZE, DMU_OT_BPOBJ_HDR, sizeof (bpobj_phys_t), tx); 8103b2aab18SMatthew Ahrens VERIFY0(zap_add(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, 811cde58dbcSMatthew Ahrens DMU_POOL_FREE_BPOBJ, sizeof (uint64_t), 1, &obj, tx)); 8123b2aab18SMatthew Ahrens VERIFY0(bpobj_open(&dp->dp_free_bpobj, dp->dp_meta_objset, obj)); 813cde58dbcSMatthew Ahrens 8143b2aab18SMatthew Ahrens VERIFY0(dmu_objset_find_dp(dp, dp->dp_root_dir_obj, 815cde58dbcSMatthew Ahrens upgrade_dir_clones_cb, tx, DS_FIND_CHILDREN)); 816cde58dbcSMatthew Ahrens } 817cde58dbcSMatthew Ahrens 818088f3894Sahrens void 819088f3894Sahrens dsl_pool_create_origin(dsl_pool_t *dp, dmu_tx_t *tx) 820088f3894Sahrens { 821088f3894Sahrens uint64_t dsobj; 822088f3894Sahrens dsl_dataset_t *ds; 823088f3894Sahrens 824088f3894Sahrens ASSERT(dmu_tx_is_syncing(tx)); 825088f3894Sahrens ASSERT(dp->dp_origin_snap == NULL); 8263b2aab18SMatthew Ahrens ASSERT(rrw_held(&dp->dp_config_rwlock, RW_WRITER)); 827088f3894Sahrens 828088f3894Sahrens /* create the origin dir, ds, & snap-ds */ 829088f3894Sahrens dsobj = dsl_dataset_create_sync(dp->dp_root_dir, ORIGIN_DIR_NAME, 830088f3894Sahrens NULL, 0, kcred, tx); 8313b2aab18SMatthew Ahrens VERIFY0(dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds)); 8323b2aab18SMatthew Ahrens dsl_dataset_snapshot_sync_impl(ds, ORIGIN_DIR_NAME, tx); 833c1379625SJustin T. Gibbs VERIFY0(dsl_dataset_hold_obj(dp, dsl_dataset_phys(ds)->ds_prev_snap_obj, 834088f3894Sahrens dp, &dp->dp_origin_snap)); 835088f3894Sahrens dsl_dataset_rele(ds, FTAG); 836088f3894Sahrens } 8379d3574bfSNeil Perrin 8389d3574bfSNeil Perrin taskq_t * 8399d3574bfSNeil Perrin dsl_pool_vnrele_taskq(dsl_pool_t *dp) 8409d3574bfSNeil Perrin { 8419d3574bfSNeil Perrin return (dp->dp_vnrele_taskq); 8429d3574bfSNeil Perrin } 843ca45db41SChris Kirby 844ca45db41SChris Kirby /* 845ca45db41SChris Kirby * Walk through the pool-wide zap object of temporary snapshot user holds 846ca45db41SChris Kirby * and release them. 847ca45db41SChris Kirby */ 848ca45db41SChris Kirby void 849ca45db41SChris Kirby dsl_pool_clean_tmp_userrefs(dsl_pool_t *dp) 850ca45db41SChris Kirby { 851ca45db41SChris Kirby zap_attribute_t za; 852ca45db41SChris Kirby zap_cursor_t zc; 853ca45db41SChris Kirby objset_t *mos = dp->dp_meta_objset; 854ca45db41SChris Kirby uint64_t zapobj = dp->dp_tmp_userrefs_obj; 855a7a845e4SSteven Hartland nvlist_t *holds; 856ca45db41SChris Kirby 857ca45db41SChris Kirby if (zapobj == 0) 858ca45db41SChris Kirby return; 859ca45db41SChris Kirby ASSERT(spa_version(dp->dp_spa) >= SPA_VERSION_USERREFS); 860ca45db41SChris Kirby 861a7a845e4SSteven Hartland holds = fnvlist_alloc(); 862a7a845e4SSteven Hartland 863ca45db41SChris Kirby for (zap_cursor_init(&zc, mos, zapobj); 864ca45db41SChris Kirby zap_cursor_retrieve(&zc, &za) == 0; 865ca45db41SChris Kirby zap_cursor_advance(&zc)) { 866ca45db41SChris Kirby char *htag; 867a7a845e4SSteven Hartland nvlist_t *tags; 868ca45db41SChris Kirby 869ca45db41SChris Kirby htag = strchr(za.za_name, '-'); 870ca45db41SChris Kirby *htag = '\0'; 871ca45db41SChris Kirby ++htag; 872a7a845e4SSteven Hartland if (nvlist_lookup_nvlist(holds, za.za_name, &tags) != 0) { 873a7a845e4SSteven Hartland tags = fnvlist_alloc(); 874a7a845e4SSteven Hartland fnvlist_add_boolean(tags, htag); 875a7a845e4SSteven Hartland fnvlist_add_nvlist(holds, za.za_name, tags); 876a7a845e4SSteven Hartland fnvlist_free(tags); 877a7a845e4SSteven Hartland } else { 878a7a845e4SSteven Hartland fnvlist_add_boolean(tags, htag); 879a7a845e4SSteven Hartland } 880ca45db41SChris Kirby } 881a7a845e4SSteven Hartland dsl_dataset_user_release_tmp(dp, holds); 882a7a845e4SSteven Hartland fnvlist_free(holds); 883ca45db41SChris Kirby zap_cursor_fini(&zc); 884ca45db41SChris Kirby } 885ca45db41SChris Kirby 886ca45db41SChris Kirby /* 887ca45db41SChris Kirby * Create the pool-wide zap object for storing temporary snapshot holds. 888ca45db41SChris Kirby */ 889ca45db41SChris Kirby void 890ca45db41SChris Kirby dsl_pool_user_hold_create_obj(dsl_pool_t *dp, dmu_tx_t *tx) 891ca45db41SChris Kirby { 892ca45db41SChris Kirby objset_t *mos = dp->dp_meta_objset; 893ca45db41SChris Kirby 894ca45db41SChris Kirby ASSERT(dp->dp_tmp_userrefs_obj == 0); 895ca45db41SChris Kirby ASSERT(dmu_tx_is_syncing(tx)); 896ca45db41SChris Kirby 897ad135b5dSChristopher Siden dp->dp_tmp_userrefs_obj = zap_create_link(mos, DMU_OT_USERREFS, 898ad135b5dSChristopher Siden DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_TMP_USERREFS, tx); 899ca45db41SChris Kirby } 900ca45db41SChris Kirby 901ca45db41SChris Kirby static int 902ca45db41SChris Kirby dsl_pool_user_hold_rele_impl(dsl_pool_t *dp, uint64_t dsobj, 9033b2aab18SMatthew Ahrens const char *tag, uint64_t now, dmu_tx_t *tx, boolean_t holding) 904ca45db41SChris Kirby { 905ca45db41SChris Kirby objset_t *mos = dp->dp_meta_objset; 906ca45db41SChris Kirby uint64_t zapobj = dp->dp_tmp_userrefs_obj; 907ca45db41SChris Kirby char *name; 908ca45db41SChris Kirby int error; 909ca45db41SChris Kirby 910ca45db41SChris Kirby ASSERT(spa_version(dp->dp_spa) >= SPA_VERSION_USERREFS); 911ca45db41SChris Kirby ASSERT(dmu_tx_is_syncing(tx)); 912ca45db41SChris Kirby 913ca45db41SChris Kirby /* 914ca45db41SChris Kirby * If the pool was created prior to SPA_VERSION_USERREFS, the 915ca45db41SChris Kirby * zap object for temporary holds might not exist yet. 916ca45db41SChris Kirby */ 917ca45db41SChris Kirby if (zapobj == 0) { 918ca45db41SChris Kirby if (holding) { 919ca45db41SChris Kirby dsl_pool_user_hold_create_obj(dp, tx); 920ca45db41SChris Kirby zapobj = dp->dp_tmp_userrefs_obj; 921ca45db41SChris Kirby } else { 922be6fd75aSMatthew Ahrens return (SET_ERROR(ENOENT)); 923ca45db41SChris Kirby } 924ca45db41SChris Kirby } 925ca45db41SChris Kirby 926ca45db41SChris Kirby name = kmem_asprintf("%llx-%s", (u_longlong_t)dsobj, tag); 927ca45db41SChris Kirby if (holding) 9283b2aab18SMatthew Ahrens error = zap_add(mos, zapobj, name, 8, 1, &now, tx); 929ca45db41SChris Kirby else 930ca45db41SChris Kirby error = zap_remove(mos, zapobj, name, tx); 931ca45db41SChris Kirby strfree(name); 932ca45db41SChris Kirby 933ca45db41SChris Kirby return (error); 934ca45db41SChris Kirby } 935ca45db41SChris Kirby 936ca45db41SChris Kirby /* 937ca45db41SChris Kirby * Add a temporary hold for the given dataset object and tag. 938ca45db41SChris Kirby */ 939ca45db41SChris Kirby int 940ca45db41SChris Kirby dsl_pool_user_hold(dsl_pool_t *dp, uint64_t dsobj, const char *tag, 9413b2aab18SMatthew Ahrens uint64_t now, dmu_tx_t *tx) 942ca45db41SChris Kirby { 94315508ac0SChris Kirby return (dsl_pool_user_hold_rele_impl(dp, dsobj, tag, now, tx, B_TRUE)); 944ca45db41SChris Kirby } 945ca45db41SChris Kirby 946ca45db41SChris Kirby /* 947ca45db41SChris Kirby * Release a temporary hold for the given dataset object and tag. 948ca45db41SChris Kirby */ 949ca45db41SChris Kirby int 950ca45db41SChris Kirby dsl_pool_user_release(dsl_pool_t *dp, uint64_t dsobj, const char *tag, 951ca45db41SChris Kirby dmu_tx_t *tx) 952ca45db41SChris Kirby { 953ca45db41SChris Kirby return (dsl_pool_user_hold_rele_impl(dp, dsobj, tag, NULL, 954ca45db41SChris Kirby tx, B_FALSE)); 955ca45db41SChris Kirby } 9563b2aab18SMatthew Ahrens 9573b2aab18SMatthew Ahrens /* 9583b2aab18SMatthew Ahrens * DSL Pool Configuration Lock 9593b2aab18SMatthew Ahrens * 9603b2aab18SMatthew Ahrens * The dp_config_rwlock protects against changes to DSL state (e.g. dataset 9613b2aab18SMatthew Ahrens * creation / destruction / rename / property setting). It must be held for 9623b2aab18SMatthew Ahrens * read to hold a dataset or dsl_dir. I.e. you must call 9633b2aab18SMatthew Ahrens * dsl_pool_config_enter() or dsl_pool_hold() before calling 9643b2aab18SMatthew Ahrens * dsl_{dataset,dir}_hold{_obj}. In most circumstances, the dp_config_rwlock 9653b2aab18SMatthew Ahrens * must be held continuously until all datasets and dsl_dirs are released. 9663b2aab18SMatthew Ahrens * 9673b2aab18SMatthew Ahrens * The only exception to this rule is that if a "long hold" is placed on 9683b2aab18SMatthew Ahrens * a dataset, then the dp_config_rwlock may be dropped while the dataset 9693b2aab18SMatthew Ahrens * is still held. The long hold will prevent the dataset from being 9703b2aab18SMatthew Ahrens * destroyed -- the destroy will fail with EBUSY. A long hold can be 9713b2aab18SMatthew Ahrens * obtained by calling dsl_dataset_long_hold(), or by "owning" a dataset 9723b2aab18SMatthew Ahrens * (by calling dsl_{dataset,objset}_{try}own{_obj}). 9733b2aab18SMatthew Ahrens * 9743b2aab18SMatthew Ahrens * Legitimate long-holders (including owners) should be long-running, cancelable 9753b2aab18SMatthew Ahrens * tasks that should cause "zfs destroy" to fail. This includes DMU 9763b2aab18SMatthew Ahrens * consumers (i.e. a ZPL filesystem being mounted or ZVOL being open), 9773b2aab18SMatthew Ahrens * "zfs send", and "zfs diff". There are several other long-holders whose 9783b2aab18SMatthew Ahrens * uses are suboptimal (e.g. "zfs promote", and zil_suspend()). 9793b2aab18SMatthew Ahrens * 9803b2aab18SMatthew Ahrens * The usual formula for long-holding would be: 9813b2aab18SMatthew Ahrens * dsl_pool_hold() 9823b2aab18SMatthew Ahrens * dsl_dataset_hold() 9833b2aab18SMatthew Ahrens * ... perform checks ... 9843b2aab18SMatthew Ahrens * dsl_dataset_long_hold() 9853b2aab18SMatthew Ahrens * dsl_pool_rele() 9863b2aab18SMatthew Ahrens * ... perform long-running task ... 9873b2aab18SMatthew Ahrens * dsl_dataset_long_rele() 9883b2aab18SMatthew Ahrens * dsl_dataset_rele() 9893b2aab18SMatthew Ahrens * 9903b2aab18SMatthew Ahrens * Note that when the long hold is released, the dataset is still held but 9913b2aab18SMatthew Ahrens * the pool is not held. The dataset may change arbitrarily during this time 9923b2aab18SMatthew Ahrens * (e.g. it could be destroyed). Therefore you shouldn't do anything to the 9933b2aab18SMatthew Ahrens * dataset except release it. 9943b2aab18SMatthew Ahrens * 9953b2aab18SMatthew Ahrens * User-initiated operations (e.g. ioctls, zfs_ioc_*()) are either read-only 9963b2aab18SMatthew Ahrens * or modifying operations. 9973b2aab18SMatthew Ahrens * 9983b2aab18SMatthew Ahrens * Modifying operations should generally use dsl_sync_task(). The synctask 9993b2aab18SMatthew Ahrens * infrastructure enforces proper locking strategy with respect to the 10003b2aab18SMatthew Ahrens * dp_config_rwlock. See the comment above dsl_sync_task() for details. 10013b2aab18SMatthew Ahrens * 10023b2aab18SMatthew Ahrens * Read-only operations will manually hold the pool, then the dataset, obtain 10033b2aab18SMatthew Ahrens * information from the dataset, then release the pool and dataset. 10043b2aab18SMatthew Ahrens * dmu_objset_{hold,rele}() are convenience routines that also do the pool 10053b2aab18SMatthew Ahrens * hold/rele. 10063b2aab18SMatthew Ahrens */ 10073b2aab18SMatthew Ahrens 10083b2aab18SMatthew Ahrens int 10093b2aab18SMatthew Ahrens dsl_pool_hold(const char *name, void *tag, dsl_pool_t **dp) 10103b2aab18SMatthew Ahrens { 10113b2aab18SMatthew Ahrens spa_t *spa; 10123b2aab18SMatthew Ahrens int error; 10133b2aab18SMatthew Ahrens 10143b2aab18SMatthew Ahrens error = spa_open(name, &spa, tag); 10153b2aab18SMatthew Ahrens if (error == 0) { 10163b2aab18SMatthew Ahrens *dp = spa_get_dsl(spa); 10173b2aab18SMatthew Ahrens dsl_pool_config_enter(*dp, tag); 10183b2aab18SMatthew Ahrens } 10193b2aab18SMatthew Ahrens return (error); 10203b2aab18SMatthew Ahrens } 10213b2aab18SMatthew Ahrens 10223b2aab18SMatthew Ahrens void 10233b2aab18SMatthew Ahrens dsl_pool_rele(dsl_pool_t *dp, void *tag) 10243b2aab18SMatthew Ahrens { 10253b2aab18SMatthew Ahrens dsl_pool_config_exit(dp, tag); 10263b2aab18SMatthew Ahrens spa_close(dp->dp_spa, tag); 10273b2aab18SMatthew Ahrens } 10283b2aab18SMatthew Ahrens 10293b2aab18SMatthew Ahrens void 10303b2aab18SMatthew Ahrens dsl_pool_config_enter(dsl_pool_t *dp, void *tag) 10313b2aab18SMatthew Ahrens { 10323b2aab18SMatthew Ahrens /* 10333b2aab18SMatthew Ahrens * We use a "reentrant" reader-writer lock, but not reentrantly. 10343b2aab18SMatthew Ahrens * 10353b2aab18SMatthew Ahrens * The rrwlock can (with the track_all flag) track all reading threads, 10363b2aab18SMatthew Ahrens * which is very useful for debugging which code path failed to release 10373b2aab18SMatthew Ahrens * the lock, and for verifying that the *current* thread does hold 10383b2aab18SMatthew Ahrens * the lock. 10393b2aab18SMatthew Ahrens * 10403b2aab18SMatthew Ahrens * (Unlike a rwlock, which knows that N threads hold it for 10413b2aab18SMatthew Ahrens * read, but not *which* threads, so rw_held(RW_READER) returns TRUE 10423b2aab18SMatthew Ahrens * if any thread holds it for read, even if this thread doesn't). 10433b2aab18SMatthew Ahrens */ 10443b2aab18SMatthew Ahrens ASSERT(!rrw_held(&dp->dp_config_rwlock, RW_READER)); 10453b2aab18SMatthew Ahrens rrw_enter(&dp->dp_config_rwlock, RW_READER, tag); 10463b2aab18SMatthew Ahrens } 10473b2aab18SMatthew Ahrens 10483b2aab18SMatthew Ahrens void 10493b2aab18SMatthew Ahrens dsl_pool_config_exit(dsl_pool_t *dp, void *tag) 10503b2aab18SMatthew Ahrens { 10513b2aab18SMatthew Ahrens rrw_exit(&dp->dp_config_rwlock, tag); 10523b2aab18SMatthew Ahrens } 10533b2aab18SMatthew Ahrens 10543b2aab18SMatthew Ahrens boolean_t 10553b2aab18SMatthew Ahrens dsl_pool_config_held(dsl_pool_t *dp) 10563b2aab18SMatthew Ahrens { 10573b2aab18SMatthew Ahrens return (RRW_LOCK_HELD(&dp->dp_config_rwlock)); 10583b2aab18SMatthew Ahrens } 1059