4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
25 #include <sys/dsl_pool.h>
26 #include <sys/dsl_dataset.h>
27 #include <sys/dsl_prop.h>
28 #include <sys/dsl_dir.h>
29 #include <sys/dsl_synctask.h>
30 #include <sys/dsl_scan.h>
31 #include <sys/dnode.h>
32 #include <sys/dmu_tx.h>
33 #include <sys/dmu_objset.h>
37 #include <sys/zfs_context.h>
38 #include <sys/fs/zfs.h>
39 #include <sys/zfs_znode.h>
40 #include <sys/spa_impl.h>
41 #include <sys/dsl_deadlist.h>
43 int zfs_no_write_throttle = 0;
44 int zfs_write_limit_shift = 3; /* 1/8th of physical memory */
45 int zfs_txg_synctime_ms = 1000; /* target millisecs to sync a txg */
47 uint64_t zfs_write_limit_min = 32 << 20; /* min write limit is 32MB */
48 uint64_t zfs_write_limit_max = 0; /* max data payload per txg */
49 uint64_t zfs_write_limit_inflated = 0;
50 uint64_t zfs_write_limit_override = 0;
52 kmutex_t zfs_write_limit_lock;
54 static pgcnt_t old_physmem = 0;
57 dsl_pool_open_special_dir(dsl_pool_t *dp, const char *name, dsl_dir_t **ddp)
62 err = zap_lookup(dp->dp_meta_objset,
63 dp->dp_root_dir->dd_phys->dd_child_dir_zapobj,
64 name, sizeof (obj), 1, &obj);
68 return (dsl_dir_open_obj(dp, obj, name, dp, ddp));
72 dsl_pool_open_impl(spa_t *spa, uint64_t txg)
75 blkptr_t *bp = spa_get_rootblkptr(spa);
77 dp = kmem_zalloc(sizeof (dsl_pool_t), KM_SLEEP);
79 dp->dp_meta_rootbp = *bp;
80 rw_init(&dp->dp_config_rwlock, NULL, RW_DEFAULT, NULL);
81 dp->dp_write_limit = zfs_write_limit_min;
84 txg_list_create(&dp->dp_dirty_datasets,
85 offsetof(dsl_dataset_t, ds_dirty_link));
86 txg_list_create(&dp->dp_dirty_dirs,
87 offsetof(dsl_dir_t, dd_dirty_link));
88 txg_list_create(&dp->dp_sync_tasks,
89 offsetof(dsl_sync_task_group_t, dstg_node));
90 list_create(&dp->dp_synced_datasets, sizeof (dsl_dataset_t),
91 offsetof(dsl_dataset_t, ds_synced_link));
93 mutex_init(&dp->dp_lock, NULL, MUTEX_DEFAULT, NULL);
95 dp->dp_iput_taskq = taskq_create("zfs_iput_taskq", 1, minclsyspri,
102 dsl_pool_open(spa_t *spa, uint64_t txg, dsl_pool_t **dpp)
105 dsl_pool_t *dp = dsl_pool_open_impl(spa, txg);
110 rw_enter(&dp->dp_config_rwlock, RW_WRITER);
111 err = dmu_objset_open_impl(spa, NULL, &dp->dp_meta_rootbp,
112 &dp->dp_meta_objset);
116 err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
117 DMU_POOL_ROOT_DATASET, sizeof (uint64_t), 1,
118 &dp->dp_root_dir_obj);
122 err = dsl_dir_open_obj(dp, dp->dp_root_dir_obj,
123 NULL, dp, &dp->dp_root_dir);
127 err = dsl_pool_open_special_dir(dp, MOS_DIR_NAME, &dp->dp_mos_dir);
131 if (spa_version(spa) >= SPA_VERSION_ORIGIN) {
132 err = dsl_pool_open_special_dir(dp, ORIGIN_DIR_NAME, &dd);
135 err = dsl_dataset_hold_obj(dp, dd->dd_phys->dd_head_dataset_obj,
138 err = dsl_dataset_hold_obj(dp,
139 ds->ds_phys->ds_prev_snap_obj, dp,
140 &dp->dp_origin_snap);
141 dsl_dataset_rele(ds, FTAG);
143 dsl_dir_close(dd, dp);
148 if (spa_version(spa) >= SPA_VERSION_DEADLISTS) {
149 err = dsl_pool_open_special_dir(dp, FREE_DIR_NAME,
154 err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
155 DMU_POOL_FREE_BPOBJ, sizeof (uint64_t), 1, &obj);
158 VERIFY3U(0, ==, bpobj_open(&dp->dp_free_bpobj,
159 dp->dp_meta_objset, obj));
162 err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
163 DMU_POOL_TMP_USERREFS, sizeof (uint64_t), 1,
164 &dp->dp_tmp_userrefs_obj);
170 err = dsl_scan_init(dp, txg);
173 rw_exit(&dp->dp_config_rwlock);
183 dsl_pool_close(dsl_pool_t *dp)
185 /* drop our references from dsl_pool_open() */
188 * Since we held the origin_snap from "syncing" context (which
189 * includes pool-opening context), it actually only got a "ref"
190 * and not a hold, so just drop that here.
192 if (dp->dp_origin_snap)
193 dsl_dataset_drop_ref(dp->dp_origin_snap, dp);
195 dsl_dir_close(dp->dp_mos_dir, dp);
197 dsl_dir_close(dp->dp_free_dir, dp);
199 dsl_dir_close(dp->dp_root_dir, dp);
201 bpobj_close(&dp->dp_free_bpobj);
203 /* undo the dmu_objset_open_impl(mos) from dsl_pool_open() */
204 if (dp->dp_meta_objset)
205 dmu_objset_evict(dp->dp_meta_objset);
207 txg_list_destroy(&dp->dp_dirty_datasets);
208 txg_list_destroy(&dp->dp_sync_tasks);
209 txg_list_destroy(&dp->dp_dirty_dirs);
210 list_destroy(&dp->dp_synced_datasets);
212 arc_flush(dp->dp_spa);
215 rw_destroy(&dp->dp_config_rwlock);
216 mutex_destroy(&dp->dp_lock);
217 taskq_destroy(dp->dp_iput_taskq);
219 kmem_free(dp->dp_blkstats, sizeof (zfs_all_blkstats_t));
220 kmem_free(dp, sizeof (dsl_pool_t));
224 dsl_pool_create(spa_t *spa, nvlist_t *zplprops, uint64_t txg)
227 dsl_pool_t *dp = dsl_pool_open_impl(spa, txg);
228 dmu_tx_t *tx = dmu_tx_create_assigned(dp, txg);
233 /* create and open the MOS (meta-objset) */
234 dp->dp_meta_objset = dmu_objset_create_impl(spa,
235 NULL, &dp->dp_meta_rootbp, DMU_OST_META, tx);
237 /* create the pool directory */
238 err = zap_create_claim(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
239 DMU_OT_OBJECT_DIRECTORY, DMU_OT_NONE, 0, tx);
240 ASSERT3U(err, ==, 0);
242 /* Initialize scan structures */
243 VERIFY3U(0, ==, dsl_scan_init(dp, txg));
245 /* create and open the root dir */
246 dp->dp_root_dir_obj = dsl_dir_create_sync(dp, NULL, NULL, tx);
247 VERIFY(0 == dsl_dir_open_obj(dp, dp->dp_root_dir_obj,
248 NULL, dp, &dp->dp_root_dir));
250 /* create and open the meta-objset dir */
251 (void) dsl_dir_create_sync(dp, dp->dp_root_dir, MOS_DIR_NAME, tx);
252 VERIFY(0 == dsl_pool_open_special_dir(dp,
253 MOS_DIR_NAME, &dp->dp_mos_dir));
255 if (spa_version(spa) >= SPA_VERSION_DEADLISTS) {
256 /* create and open the free dir */
257 (void) dsl_dir_create_sync(dp, dp->dp_root_dir,
259 VERIFY(0 == dsl_pool_open_special_dir(dp,
260 FREE_DIR_NAME, &dp->dp_free_dir));
262 /* create and open the free_bplist */
263 obj = bpobj_alloc(dp->dp_meta_objset, SPA_MAXBLOCKSIZE, tx);
264 VERIFY(zap_add(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
265 DMU_POOL_FREE_BPOBJ, sizeof (uint64_t), 1, &obj, tx) == 0);
266 VERIFY3U(0, ==, bpobj_open(&dp->dp_free_bpobj,
267 dp->dp_meta_objset, obj));
270 if (spa_version(spa) >= SPA_VERSION_DSL_SCRUB)
271 dsl_pool_create_origin(dp, tx);
273 /* create the root dataset */
274 obj = dsl_dataset_create_sync_dd(dp->dp_root_dir, NULL, 0, tx);
276 /* create the root objset */
277 VERIFY(0 == dsl_dataset_hold_obj(dp, obj, FTAG, &ds));
278 os = dmu_objset_create_impl(dp->dp_spa, ds,
279 dsl_dataset_get_blkptr(ds), DMU_OST_ZFS, tx);
281 zfs_create_fs(os, kcred, zplprops, tx);
283 dsl_dataset_rele(ds, FTAG);
291 deadlist_enqueue_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx)
293 dsl_deadlist_t *dl = arg;
294 dsl_deadlist_insert(dl, bp, tx);
299 dsl_pool_sync(dsl_pool_t *dp, uint64_t txg)
305 dsl_sync_task_group_t *dstg;
306 objset_t *mos = dp->dp_meta_objset;
307 hrtime_t start, write_time;
308 uint64_t data_written;
312 * We need to copy dp_space_towrite() before doing
313 * dsl_sync_task_group_sync(), because
314 * dsl_dataset_snapshot_reserve_space() will increase
315 * dp_space_towrite but not actually write anything.
317 data_written = dp->dp_space_towrite[txg & TXG_MASK];
319 tx = dmu_tx_create_assigned(dp, txg);
321 dp->dp_read_overhead = 0;
324 zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED);
325 while ((ds = txg_list_remove(&dp->dp_dirty_datasets, txg))) {
327 * We must not sync any non-MOS datasets twice, because
328 * we may have taken a snapshot of them. However, we
329 * may sync newly-created datasets on pass 2.
331 ASSERT(!list_link_active(&ds->ds_synced_link));
332 list_insert_tail(&dp->dp_synced_datasets, ds);
333 dsl_dataset_sync(ds, zio, tx);
335 DTRACE_PROBE(pool_sync__1setup);
338 write_time = gethrtime() - start;
340 DTRACE_PROBE(pool_sync__2rootzio);
342 for (ds = list_head(&dp->dp_synced_datasets); ds;
343 ds = list_next(&dp->dp_synced_datasets, ds))
344 dmu_objset_do_userquota_updates(ds->ds_objset, tx);
347 * Sync the datasets again to push out the changes due to
348 * userspace updates. This must be done before we process the
349 * sync tasks, because that could cause a snapshot of a dataset
350 * whose ds_bp will be rewritten when we do this 2nd sync.
352 zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED);
353 while ((ds = txg_list_remove(&dp->dp_dirty_datasets, txg))) {
354 ASSERT(list_link_active(&ds->ds_synced_link));
355 dmu_buf_rele(ds->ds_dbuf, ds);
356 dsl_dataset_sync(ds, zio, tx);
361 * Move dead blocks from the pending deadlist to the on-disk
364 for (ds = list_head(&dp->dp_synced_datasets); ds;
365 ds = list_next(&dp->dp_synced_datasets, ds)) {
366 bplist_iterate(&ds->ds_pending_deadlist,
367 deadlist_enqueue_cb, &ds->ds_deadlist, tx);
370 while ((dstg = txg_list_remove(&dp->dp_sync_tasks, txg))) {
372 * No more sync tasks should have been added while we
375 ASSERT(spa_sync_pass(dp->dp_spa) == 1);
376 dsl_sync_task_group_sync(dstg, tx);
378 DTRACE_PROBE(pool_sync__3task);
381 while ((dd = txg_list_remove(&dp->dp_dirty_dirs, txg)))
382 dsl_dir_sync(dd, tx);
383 write_time += gethrtime() - start;
386 if (list_head(&mos->os_dirty_dnodes[txg & TXG_MASK]) != NULL ||
387 list_head(&mos->os_free_dnodes[txg & TXG_MASK]) != NULL) {
388 zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED);
389 dmu_objset_sync(mos, zio, tx);
392 dprintf_bp(&dp->dp_meta_rootbp, "meta objset rootbp is %s", "");
393 spa_set_rootblkptr(dp->dp_spa, &dp->dp_meta_rootbp);
395 write_time += gethrtime() - start;
396 DTRACE_PROBE2(pool_sync__4io, hrtime_t, write_time,
397 hrtime_t, dp->dp_read_overhead);
398 write_time -= dp->dp_read_overhead;
402 dp->dp_space_towrite[txg & TXG_MASK] = 0;
403 ASSERT(dp->dp_tempreserved[txg & TXG_MASK] == 0);
406 * If the write limit max has not been explicitly set, set it
407 * to a fraction of available physical memory (default 1/8th).
408 * Note that we must inflate the limit because the spa
409 * inflates write sizes to account for data replication.
410 * Check this each sync phase to catch changing memory size.
412 if (physmem != old_physmem && zfs_write_limit_shift) {
413 mutex_enter(&zfs_write_limit_lock);
414 old_physmem = physmem;
415 zfs_write_limit_max = ptob(physmem) >> zfs_write_limit_shift;
416 zfs_write_limit_inflated = MAX(zfs_write_limit_min,
417 spa_get_asize(dp->dp_spa, zfs_write_limit_max));
418 mutex_exit(&zfs_write_limit_lock);
422 * Attempt to keep the sync time consistent by adjusting the
423 * amount of write traffic allowed into each transaction group.
424 * Weight the throughput calculation towards the current value:
425 * thru = 3/4 old_thru + 1/4 new_thru
427 * Note: write_time is in nanosecs, so write_time/MICROSEC
430 ASSERT(zfs_write_limit_min > 0);
431 if (data_written > zfs_write_limit_min / 8 && write_time > MICROSEC) {
432 uint64_t throughput = data_written / (write_time / MICROSEC);
434 if (dp->dp_throughput)
435 dp->dp_throughput = throughput / 4 +
436 3 * dp->dp_throughput / 4;
438 dp->dp_throughput = throughput;
439 dp->dp_write_limit = MIN(zfs_write_limit_inflated,
440 MAX(zfs_write_limit_min,
441 dp->dp_throughput * zfs_txg_synctime_ms));
446 dsl_pool_sync_done(dsl_pool_t *dp, uint64_t txg)
451 while ((ds = list_head(&dp->dp_synced_datasets))) {
452 list_remove(&dp->dp_synced_datasets, ds);
454 zil_clean(os->os_zil, txg);
455 ASSERT(!dmu_objset_is_dirty(os, txg));
456 dmu_buf_rele(ds->ds_dbuf, ds);
458 ASSERT(!dmu_objset_is_dirty(dp->dp_meta_objset, txg));
462 * TRUE if the current thread is the tx_sync_thread or if we
463 * are being called from SPA context during pool initialization.
466 dsl_pool_sync_context(dsl_pool_t *dp)
468 return (curthread == dp->dp_tx.tx_sync_thread ||
469 spa_get_dsl(dp->dp_spa) == NULL);
473 dsl_pool_adjustedsize(dsl_pool_t *dp, boolean_t netfree)
475 uint64_t space, resv;
478 * Reserve about 1.6% (1/64), or at least 32MB, for allocation
480 * XXX The intent log is not accounted for, so it must fit
483 * If we're trying to assess whether it's OK to do a free,
484 * cut the reservation in half to allow forward progress
485 * (e.g. make it possible to rm(1) files from a full pool).
487 space = spa_get_dspace(dp->dp_spa);
488 resv = MAX(space >> 6, SPA_MINDEVSIZE >> 1);
492 return (space - resv);
496 dsl_pool_tempreserve_space(dsl_pool_t *dp, uint64_t space, dmu_tx_t *tx)
498 uint64_t reserved = 0;
499 uint64_t write_limit = (zfs_write_limit_override ?
500 zfs_write_limit_override : dp->dp_write_limit);
502 if (zfs_no_write_throttle) {
503 atomic_add_64(&dp->dp_tempreserved[tx->tx_txg & TXG_MASK],
509 * Check to see if we have exceeded the maximum allowed IO for
510 * this transaction group. We can do this without locks since
511 * a little slop here is ok. Note that we do the reserved check
512 * with only half the requested reserve: this is because the
513 * reserve requests are worst-case, and we really don't want to
514 * throttle based off of worst-case estimates.
516 if (write_limit > 0) {
517 reserved = dp->dp_space_towrite[tx->tx_txg & TXG_MASK]
518 + dp->dp_tempreserved[tx->tx_txg & TXG_MASK] / 2;
520 if (reserved && reserved > write_limit)
524 atomic_add_64(&dp->dp_tempreserved[tx->tx_txg & TXG_MASK], space);
527 * If this transaction group is over 7/8ths capacity, delay
528 * the caller 1 clock tick. This will slow down the "fill"
529 * rate until the sync process can catch up with us.
531 if (reserved && reserved > (write_limit - (write_limit >> 3)))
532 txg_delay(dp, tx->tx_txg, 1);
538 dsl_pool_tempreserve_clear(dsl_pool_t *dp, int64_t space, dmu_tx_t *tx)
540 ASSERT(dp->dp_tempreserved[tx->tx_txg & TXG_MASK] >= space);
541 atomic_add_64(&dp->dp_tempreserved[tx->tx_txg & TXG_MASK], -space);
545 dsl_pool_memory_pressure(dsl_pool_t *dp)
547 uint64_t space_inuse = 0;
550 if (dp->dp_write_limit == zfs_write_limit_min)
553 for (i = 0; i < TXG_SIZE; i++) {
554 space_inuse += dp->dp_space_towrite[i];
555 space_inuse += dp->dp_tempreserved[i];
557 dp->dp_write_limit = MAX(zfs_write_limit_min,
558 MIN(dp->dp_write_limit, space_inuse / 4));
562 dsl_pool_willuse_space(dsl_pool_t *dp, int64_t space, dmu_tx_t *tx)
565 mutex_enter(&dp->dp_lock);
566 dp->dp_space_towrite[tx->tx_txg & TXG_MASK] += space;
567 mutex_exit(&dp->dp_lock);
573 upgrade_clones_cb(spa_t *spa, uint64_t dsobj, const char *dsname, void *arg)
576 dsl_dataset_t *ds, *prev = NULL;
578 dsl_pool_t *dp = spa_get_dsl(spa);
580 err = dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds);
584 while (ds->ds_phys->ds_prev_snap_obj != 0) {
585 err = dsl_dataset_hold_obj(dp, ds->ds_phys->ds_prev_snap_obj,
588 dsl_dataset_rele(ds, FTAG);
592 if (prev->ds_phys->ds_next_snap_obj != ds->ds_object)
594 dsl_dataset_rele(ds, FTAG);
600 prev = dp->dp_origin_snap;
603 * The $ORIGIN can't have any data, or the accounting
606 ASSERT(prev->ds_phys->ds_bp.blk_birth == 0);
608 /* The origin doesn't get attached to itself */
609 if (ds->ds_object == prev->ds_object) {
610 dsl_dataset_rele(ds, FTAG);
614 dmu_buf_will_dirty(ds->ds_dbuf, tx);
615 ds->ds_phys->ds_prev_snap_obj = prev->ds_object;
616 ds->ds_phys->ds_prev_snap_txg = prev->ds_phys->ds_creation_txg;
618 dmu_buf_will_dirty(ds->ds_dir->dd_dbuf, tx);
619 ds->ds_dir->dd_phys->dd_origin_obj = prev->ds_object;
621 dmu_buf_will_dirty(prev->ds_dbuf, tx);
622 prev->ds_phys->ds_num_children++;
624 if (ds->ds_phys->ds_next_snap_obj == 0) {
625 ASSERT(ds->ds_prev == NULL);
626 VERIFY(0 == dsl_dataset_hold_obj(dp,
627 ds->ds_phys->ds_prev_snap_obj, ds, &ds->ds_prev));
631 ASSERT(ds->ds_dir->dd_phys->dd_origin_obj == prev->ds_object);
632 ASSERT(ds->ds_phys->ds_prev_snap_obj == prev->ds_object);
634 if (prev->ds_phys->ds_next_clones_obj == 0) {
635 dmu_buf_will_dirty(prev->ds_dbuf, tx);
636 prev->ds_phys->ds_next_clones_obj =
637 zap_create(dp->dp_meta_objset,
638 DMU_OT_NEXT_CLONES, DMU_OT_NONE, 0, tx);
640 VERIFY(0 == zap_add_int(dp->dp_meta_objset,
641 prev->ds_phys->ds_next_clones_obj, ds->ds_object, tx));
643 dsl_dataset_rele(ds, FTAG);
644 if (prev != dp->dp_origin_snap)
645 dsl_dataset_rele(prev, FTAG);
650 dsl_pool_upgrade_clones(dsl_pool_t *dp, dmu_tx_t *tx)
652 ASSERT(dmu_tx_is_syncing(tx));
653 ASSERT(dp->dp_origin_snap != NULL);
655 VERIFY3U(0, ==, dmu_objset_find_spa(dp->dp_spa, NULL, upgrade_clones_cb,
656 tx, DS_FIND_CHILDREN));
661 upgrade_dir_clones_cb(spa_t *spa, uint64_t dsobj, const char *dsname, void *arg)
665 dsl_pool_t *dp = spa_get_dsl(spa);
666 objset_t *mos = dp->dp_meta_objset;
668 VERIFY3U(0, ==, dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds));
670 if (ds->ds_dir->dd_phys->dd_origin_obj) {
671 dsl_dataset_t *origin;
673 VERIFY3U(0, ==, dsl_dataset_hold_obj(dp,
674 ds->ds_dir->dd_phys->dd_origin_obj, FTAG, &origin));
676 if (origin->ds_dir->dd_phys->dd_clones == 0) {
677 dmu_buf_will_dirty(origin->ds_dir->dd_dbuf, tx);
678 origin->ds_dir->dd_phys->dd_clones = zap_create(mos,
679 DMU_OT_DSL_CLONES, DMU_OT_NONE, 0, tx);
682 VERIFY3U(0, ==, zap_add_int(dp->dp_meta_objset,
683 origin->ds_dir->dd_phys->dd_clones, dsobj, tx));
685 dsl_dataset_rele(origin, FTAG);
688 dsl_dataset_rele(ds, FTAG);
693 dsl_pool_upgrade_dir_clones(dsl_pool_t *dp, dmu_tx_t *tx)
697 ASSERT(dmu_tx_is_syncing(tx));
699 (void) dsl_dir_create_sync(dp, dp->dp_root_dir, FREE_DIR_NAME, tx);
700 VERIFY(0 == dsl_pool_open_special_dir(dp,
701 FREE_DIR_NAME, &dp->dp_free_dir));
704 * We can't use bpobj_alloc(), because spa_version() still
705 * returns the old version, and we need a new-version bpobj with
706 * subobj support. So call dmu_object_alloc() directly.
708 obj = dmu_object_alloc(dp->dp_meta_objset, DMU_OT_BPOBJ,
709 SPA_MAXBLOCKSIZE, DMU_OT_BPOBJ_HDR, sizeof (bpobj_phys_t), tx);
710 VERIFY3U(0, ==, zap_add(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
711 DMU_POOL_FREE_BPOBJ, sizeof (uint64_t), 1, &obj, tx));
712 VERIFY3U(0, ==, bpobj_open(&dp->dp_free_bpobj,
713 dp->dp_meta_objset, obj));
715 VERIFY3U(0, ==, dmu_objset_find_spa(dp->dp_spa, NULL,
716 upgrade_dir_clones_cb, tx, DS_FIND_CHILDREN));
720 dsl_pool_create_origin(dsl_pool_t *dp, dmu_tx_t *tx)
725 ASSERT(dmu_tx_is_syncing(tx));
726 ASSERT(dp->dp_origin_snap == NULL);
728 /* create the origin dir, ds, & snap-ds */
729 rw_enter(&dp->dp_config_rwlock, RW_WRITER);
730 dsobj = dsl_dataset_create_sync(dp->dp_root_dir, ORIGIN_DIR_NAME,
732 VERIFY(0 == dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds));
733 dsl_dataset_snapshot_sync(ds, ORIGIN_DIR_NAME, tx);
734 VERIFY(0 == dsl_dataset_hold_obj(dp, ds->ds_phys->ds_prev_snap_obj,
735 dp, &dp->dp_origin_snap));
736 dsl_dataset_rele(ds, FTAG);
737 rw_exit(&dp->dp_config_rwlock);
741 dsl_pool_iput_taskq(dsl_pool_t *dp)
743 return (dp->dp_iput_taskq);
747 * Walk through the pool-wide zap object of temporary snapshot user holds
751 dsl_pool_clean_tmp_userrefs(dsl_pool_t *dp)
755 objset_t *mos = dp->dp_meta_objset;
756 uint64_t zapobj = dp->dp_tmp_userrefs_obj;
760 ASSERT(spa_version(dp->dp_spa) >= SPA_VERSION_USERREFS);
762 for (zap_cursor_init(&zc, mos, zapobj);
763 zap_cursor_retrieve(&zc, &za) == 0;
764 zap_cursor_advance(&zc)) {
768 htag = strchr(za.za_name, '-');
771 dsobj = strtonum(za.za_name, NULL);
772 (void) dsl_dataset_user_release_tmp(dp, dsobj, htag, B_FALSE);
774 zap_cursor_fini(&zc);
778 * Create the pool-wide zap object for storing temporary snapshot holds.
781 dsl_pool_user_hold_create_obj(dsl_pool_t *dp, dmu_tx_t *tx)
783 objset_t *mos = dp->dp_meta_objset;
785 ASSERT(dp->dp_tmp_userrefs_obj == 0);
786 ASSERT(dmu_tx_is_syncing(tx));
788 dp->dp_tmp_userrefs_obj = zap_create(mos, DMU_OT_USERREFS,
791 VERIFY(zap_add(mos, DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_TMP_USERREFS,
792 sizeof (uint64_t), 1, &dp->dp_tmp_userrefs_obj, tx) == 0);
796 dsl_pool_user_hold_rele_impl(dsl_pool_t *dp, uint64_t dsobj,
797 const char *tag, uint64_t *now, dmu_tx_t *tx, boolean_t holding)
799 objset_t *mos = dp->dp_meta_objset;
800 uint64_t zapobj = dp->dp_tmp_userrefs_obj;
804 ASSERT(spa_version(dp->dp_spa) >= SPA_VERSION_USERREFS);
805 ASSERT(dmu_tx_is_syncing(tx));
808 * If the pool was created prior to SPA_VERSION_USERREFS, the
809 * zap object for temporary holds might not exist yet.
813 dsl_pool_user_hold_create_obj(dp, tx);
814 zapobj = dp->dp_tmp_userrefs_obj;
820 name = kmem_asprintf("%llx-%s", (u_longlong_t)dsobj, tag);
822 error = zap_add(mos, zapobj, name, 8, 1, now, tx);
824 error = zap_remove(mos, zapobj, name, tx);
831 * Add a temporary hold for the given dataset object and tag.
834 dsl_pool_user_hold(dsl_pool_t *dp, uint64_t dsobj, const char *tag,
835 uint64_t *now, dmu_tx_t *tx)
837 return (dsl_pool_user_hold_rele_impl(dp, dsobj, tag, now, tx, B_TRUE));
841 * Release a temporary hold for the given dataset object and tag.
844 dsl_pool_user_release(dsl_pool_t *dp, uint64_t dsobj, const char *tag,
847 return (dsl_pool_user_hold_rele_impl(dp, dsobj, tag, NULL,