dsl_destroy.c revision a7a845e4bf22fd1b2a284729ccd95c7370a0438c
13b2aab1Matthew Ahrens/*
23b2aab1Matthew Ahrens * CDDL HEADER START
33b2aab1Matthew Ahrens *
43b2aab1Matthew Ahrens * The contents of this file are subject to the terms of the
53b2aab1Matthew Ahrens * Common Development and Distribution License (the "License").
63b2aab1Matthew Ahrens * You may not use this file except in compliance with the License.
73b2aab1Matthew Ahrens *
83b2aab1Matthew Ahrens * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
93b2aab1Matthew Ahrens * or http://www.opensolaris.org/os/licensing.
103b2aab1Matthew Ahrens * See the License for the specific language governing permissions
113b2aab1Matthew Ahrens * and limitations under the License.
123b2aab1Matthew Ahrens *
133b2aab1Matthew Ahrens * When distributing Covered Code, include this CDDL HEADER in each
143b2aab1Matthew Ahrens * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
153b2aab1Matthew Ahrens * If applicable, add the following below this CDDL HEADER, with the
163b2aab1Matthew Ahrens * fields enclosed by brackets "[]" replaced with your own identifying
173b2aab1Matthew Ahrens * information: Portions Copyright [yyyy] [name of copyright owner]
183b2aab1Matthew Ahrens *
193b2aab1Matthew Ahrens * CDDL HEADER END
203b2aab1Matthew Ahrens */
213b2aab1Matthew Ahrens/*
223b2aab1Matthew Ahrens * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23be6fd75Matthew Ahrens * Copyright (c) 2013 by Delphix. All rights reserved.
24a7a845eSteven Hartland * Copyright (c) 2013 Steven Hartland. All rights reserved.
253b2aab1Matthew Ahrens */
263b2aab1Matthew Ahrens
273b2aab1Matthew Ahrens#include <sys/zfs_context.h>
283b2aab1Matthew Ahrens#include <sys/dsl_userhold.h>
293b2aab1Matthew Ahrens#include <sys/dsl_dataset.h>
303b2aab1Matthew Ahrens#include <sys/dsl_synctask.h>
313b2aab1Matthew Ahrens#include <sys/dmu_tx.h>
323b2aab1Matthew Ahrens#include <sys/dsl_pool.h>
333b2aab1Matthew Ahrens#include <sys/dsl_dir.h>
343b2aab1Matthew Ahrens#include <sys/dmu_traverse.h>
353b2aab1Matthew Ahrens#include <sys/dsl_scan.h>
363b2aab1Matthew Ahrens#include <sys/dmu_objset.h>
373b2aab1Matthew Ahrens#include <sys/zap.h>
383b2aab1Matthew Ahrens#include <sys/zfeature.h>
393b2aab1Matthew Ahrens#include <sys/zfs_ioctl.h>
403b2aab1Matthew Ahrens#include <sys/dsl_deleg.h>
413b2aab1Matthew Ahrens
423b2aab1Matthew Ahrenstypedef struct dmu_snapshots_destroy_arg {
433b2aab1Matthew Ahrens	nvlist_t *dsda_snaps;
443b2aab1Matthew Ahrens	nvlist_t *dsda_successful_snaps;
453b2aab1Matthew Ahrens	boolean_t dsda_defer;
463b2aab1Matthew Ahrens	nvlist_t *dsda_errlist;
473b2aab1Matthew Ahrens} dmu_snapshots_destroy_arg_t;
483b2aab1Matthew Ahrens
493b2aab1Matthew Ahrens/*
503b2aab1Matthew Ahrens * ds must be owned.
513b2aab1Matthew Ahrens */
523b2aab1Matthew Ahrensstatic int
533b2aab1Matthew Ahrensdsl_destroy_snapshot_check_impl(dsl_dataset_t *ds, boolean_t defer)
543b2aab1Matthew Ahrens{
553b2aab1Matthew Ahrens	if (!dsl_dataset_is_snapshot(ds))
56be6fd75Matthew Ahrens		return (SET_ERROR(EINVAL));
573b2aab1Matthew Ahrens
583b2aab1Matthew Ahrens	if (dsl_dataset_long_held(ds))
59be6fd75Matthew Ahrens		return (SET_ERROR(EBUSY));
603b2aab1Matthew Ahrens
613b2aab1Matthew Ahrens	/*
623b2aab1Matthew Ahrens	 * Only allow deferred destroy on pools that support it.
633b2aab1Matthew Ahrens	 * NOTE: deferred destroy is only supported on snapshots.
643b2aab1Matthew Ahrens	 */
653b2aab1Matthew Ahrens	if (defer) {
663b2aab1Matthew Ahrens		if (spa_version(ds->ds_dir->dd_pool->dp_spa) <
673b2aab1Matthew Ahrens		    SPA_VERSION_USERREFS)
68be6fd75Matthew Ahrens			return (SET_ERROR(ENOTSUP));
693b2aab1Matthew Ahrens		return (0);
703b2aab1Matthew Ahrens	}
713b2aab1Matthew Ahrens
723b2aab1Matthew Ahrens	/*
733b2aab1Matthew Ahrens	 * If this snapshot has an elevated user reference count,
743b2aab1Matthew Ahrens	 * we can't destroy it yet.
753b2aab1Matthew Ahrens	 */
763b2aab1Matthew Ahrens	if (ds->ds_userrefs > 0)
77be6fd75Matthew Ahrens		return (SET_ERROR(EBUSY));
783b2aab1Matthew Ahrens
793b2aab1Matthew Ahrens	/*
803b2aab1Matthew Ahrens	 * Can't delete a branch point.
813b2aab1Matthew Ahrens	 */
823b2aab1Matthew Ahrens	if (ds->ds_phys->ds_num_children > 1)
83be6fd75Matthew Ahrens		return (SET_ERROR(EEXIST));
843b2aab1Matthew Ahrens
853b2aab1Matthew Ahrens	return (0);
863b2aab1Matthew Ahrens}
873b2aab1Matthew Ahrens
883b2aab1Matthew Ahrensstatic int
893b2aab1Matthew Ahrensdsl_destroy_snapshot_check(void *arg, dmu_tx_t *tx)
903b2aab1Matthew Ahrens{
913b2aab1Matthew Ahrens	dmu_snapshots_destroy_arg_t *dsda = arg;
923b2aab1Matthew Ahrens	dsl_pool_t *dp = dmu_tx_pool(tx);
933b2aab1Matthew Ahrens	nvpair_t *pair;
943b2aab1Matthew Ahrens	int error = 0;
953b2aab1Matthew Ahrens
963b2aab1Matthew Ahrens	if (!dmu_tx_is_syncing(tx))
973b2aab1Matthew Ahrens		return (0);
983b2aab1Matthew Ahrens
993b2aab1Matthew Ahrens	for (pair = nvlist_next_nvpair(dsda->dsda_snaps, NULL);
1003b2aab1Matthew Ahrens	    pair != NULL; pair = nvlist_next_nvpair(dsda->dsda_snaps, pair)) {
1013b2aab1Matthew Ahrens		dsl_dataset_t *ds;
1023b2aab1Matthew Ahrens
1033b2aab1Matthew Ahrens		error = dsl_dataset_hold(dp, nvpair_name(pair),
1043b2aab1Matthew Ahrens		    FTAG, &ds);
1053b2aab1Matthew Ahrens
1063b2aab1Matthew Ahrens		/*
1073b2aab1Matthew Ahrens		 * If the snapshot does not exist, silently ignore it
1083b2aab1Matthew Ahrens		 * (it's "already destroyed").
1093b2aab1Matthew Ahrens		 */
1103b2aab1Matthew Ahrens		if (error == ENOENT)
1113b2aab1Matthew Ahrens			continue;
1123b2aab1Matthew Ahrens
1133b2aab1Matthew Ahrens		if (error == 0) {
1143b2aab1Matthew Ahrens			error = dsl_destroy_snapshot_check_impl(ds,
1153b2aab1Matthew Ahrens			    dsda->dsda_defer);
1163b2aab1Matthew Ahrens			dsl_dataset_rele(ds, FTAG);
1173b2aab1Matthew Ahrens		}
1183b2aab1Matthew Ahrens
1193b2aab1Matthew Ahrens		if (error == 0) {
1203b2aab1Matthew Ahrens			fnvlist_add_boolean(dsda->dsda_successful_snaps,
1213b2aab1Matthew Ahrens			    nvpair_name(pair));
1223b2aab1Matthew Ahrens		} else {
1233b2aab1Matthew Ahrens			fnvlist_add_int32(dsda->dsda_errlist,
1243b2aab1Matthew Ahrens			    nvpair_name(pair), error);
1253b2aab1Matthew Ahrens		}
1263b2aab1Matthew Ahrens	}
1273b2aab1Matthew Ahrens
1283b2aab1Matthew Ahrens	pair = nvlist_next_nvpair(dsda->dsda_errlist, NULL);
1293b2aab1Matthew Ahrens	if (pair != NULL)
1303b2aab1Matthew Ahrens		return (fnvpair_value_int32(pair));
131a7a845eSteven Hartland
132a7a845eSteven Hartland	if (nvlist_empty(dsda->dsda_successful_snaps))
133a7a845eSteven Hartland		return (SET_ERROR(ENOENT));
134a7a845eSteven Hartland
1353b2aab1Matthew Ahrens	return (0);
1363b2aab1Matthew Ahrens}
1373b2aab1Matthew Ahrens
1383b2aab1Matthew Ahrensstruct process_old_arg {
1393b2aab1Matthew Ahrens	dsl_dataset_t *ds;
1403b2aab1Matthew Ahrens	dsl_dataset_t *ds_prev;
1413b2aab1Matthew Ahrens	boolean_t after_branch_point;
1423b2aab1Matthew Ahrens	zio_t *pio;
1433b2aab1Matthew Ahrens	uint64_t used, comp, uncomp;
1443b2aab1Matthew Ahrens};
1453b2aab1Matthew Ahrens
1463b2aab1Matthew Ahrensstatic int
1473b2aab1Matthew Ahrensprocess_old_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx)
1483b2aab1Matthew Ahrens{
1493b2aab1Matthew Ahrens	struct process_old_arg *poa = arg;
1503b2aab1Matthew Ahrens	dsl_pool_t *dp = poa->ds->ds_dir->dd_pool;
1513b2aab1Matthew Ahrens
1523b2aab1Matthew Ahrens	if (bp->blk_birth <= poa->ds->ds_phys->ds_prev_snap_txg) {
1533b2aab1Matthew Ahrens		dsl_deadlist_insert(&poa->ds->ds_deadlist, bp, tx);
1543b2aab1Matthew Ahrens		if (poa->ds_prev && !poa->after_branch_point &&
1553b2aab1Matthew Ahrens		    bp->blk_birth >
1563b2aab1Matthew Ahrens		    poa->ds_prev->ds_phys->ds_prev_snap_txg) {
1573b2aab1Matthew Ahrens			poa->ds_prev->ds_phys->ds_unique_bytes +=
1583b2aab1Matthew Ahrens			    bp_get_dsize_sync(dp->dp_spa, bp);
1593b2aab1Matthew Ahrens		}
1603b2aab1Matthew Ahrens	} else {
1613b2aab1Matthew Ahrens		poa->used += bp_get_dsize_sync(dp->dp_spa, bp);
1623b2aab1Matthew Ahrens		poa->comp += BP_GET_PSIZE(bp);
1633b2aab1Matthew Ahrens		poa->uncomp += BP_GET_UCSIZE(bp);
1643b2aab1Matthew Ahrens		dsl_free_sync(poa->pio, dp, tx->tx_txg, bp);
1653b2aab1Matthew Ahrens	}
1663b2aab1Matthew Ahrens	return (0);
1673b2aab1Matthew Ahrens}
1683b2aab1Matthew Ahrens
1693b2aab1Matthew Ahrensstatic void
1703b2aab1Matthew Ahrensprocess_old_deadlist(dsl_dataset_t *ds, dsl_dataset_t *ds_prev,
1713b2aab1Matthew Ahrens    dsl_dataset_t *ds_next, boolean_t after_branch_point, dmu_tx_t *tx)
1723b2aab1Matthew Ahrens{
1733b2aab1Matthew Ahrens	struct process_old_arg poa = { 0 };
1743b2aab1Matthew Ahrens	dsl_pool_t *dp = ds->ds_dir->dd_pool;
1753b2aab1Matthew Ahrens	objset_t *mos = dp->dp_meta_objset;
1763b2aab1Matthew Ahrens	uint64_t deadlist_obj;
1773b2aab1Matthew Ahrens
1783b2aab1Matthew Ahrens	ASSERT(ds->ds_deadlist.dl_oldfmt);
1793b2aab1Matthew Ahrens	ASSERT(ds_next->ds_deadlist.dl_oldfmt);
1803b2aab1Matthew Ahrens
1813b2aab1Matthew Ahrens	poa.ds = ds;
1823b2aab1Matthew Ahrens	poa.ds_prev = ds_prev;
1833b2aab1Matthew Ahrens	poa.after_branch_point = after_branch_point;
1843b2aab1Matthew Ahrens	poa.pio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED);
1853b2aab1Matthew Ahrens	VERIFY0(bpobj_iterate(&ds_next->ds_deadlist.dl_bpobj,
1863b2aab1Matthew Ahrens	    process_old_cb, &poa, tx));
1873b2aab1Matthew Ahrens	VERIFY0(zio_wait(poa.pio));
1883b2aab1Matthew Ahrens	ASSERT3U(poa.used, ==, ds->ds_phys->ds_unique_bytes);
1893b2aab1Matthew Ahrens
1903b2aab1Matthew Ahrens	/* change snapused */
1913b2aab1Matthew Ahrens	dsl_dir_diduse_space(ds->ds_dir, DD_USED_SNAP,
1923b2aab1Matthew Ahrens	    -poa.used, -poa.comp, -poa.uncomp, tx);
1933b2aab1Matthew Ahrens
1943b2aab1Matthew Ahrens	/* swap next's deadlist to our deadlist */
1953b2aab1Matthew Ahrens	dsl_deadlist_close(&ds->ds_deadlist);
1963b2aab1Matthew Ahrens	dsl_deadlist_close(&ds_next->ds_deadlist);
1973b2aab1Matthew Ahrens	deadlist_obj = ds->ds_phys->ds_deadlist_obj;
1983b2aab1Matthew Ahrens	ds->ds_phys->ds_deadlist_obj = ds_next->ds_phys->ds_deadlist_obj;
1993b2aab1Matthew Ahrens	ds_next->ds_phys->ds_deadlist_obj = deadlist_obj;
2003b2aab1Matthew Ahrens	dsl_deadlist_open(&ds->ds_deadlist, mos, ds->ds_phys->ds_deadlist_obj);
2013b2aab1Matthew Ahrens	dsl_deadlist_open(&ds_next->ds_deadlist, mos,
2023b2aab1Matthew Ahrens	    ds_next->ds_phys->ds_deadlist_obj);
2033b2aab1Matthew Ahrens}
2043b2aab1Matthew Ahrens
2053b2aab1Matthew Ahrensstatic void
2063b2aab1Matthew Ahrensdsl_dataset_remove_clones_key(dsl_dataset_t *ds, uint64_t mintxg, dmu_tx_t *tx)
2073b2aab1Matthew Ahrens{
2083b2aab1Matthew Ahrens	objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
2093b2aab1Matthew Ahrens	zap_cursor_t zc;
2103b2aab1Matthew Ahrens	zap_attribute_t za;
2113b2aab1Matthew Ahrens
2123b2aab1Matthew Ahrens	/*
2133b2aab1Matthew Ahrens	 * If it is the old version, dd_clones doesn't exist so we can't
2143b2aab1Matthew Ahrens	 * find the clones, but dsl_deadlist_remove_key() is a no-op so it
2153b2aab1Matthew Ahrens	 * doesn't matter.
2163b2aab1Matthew Ahrens	 */
2173b2aab1Matthew Ahrens	if (ds->ds_dir->dd_phys->dd_clones == 0)
2183b2aab1Matthew Ahrens		return;
2193b2aab1Matthew Ahrens
2203b2aab1Matthew Ahrens	for (zap_cursor_init(&zc, mos, ds->ds_dir->dd_phys->dd_clones);
2213b2aab1Matthew Ahrens	    zap_cursor_retrieve(&zc, &za) == 0;
2223b2aab1Matthew Ahrens	    zap_cursor_advance(&zc)) {
2233b2aab1Matthew Ahrens		dsl_dataset_t *clone;
2243b2aab1Matthew Ahrens
2253b2aab1Matthew Ahrens		VERIFY0(dsl_dataset_hold_obj(ds->ds_dir->dd_pool,
2263b2aab1Matthew Ahrens		    za.za_first_integer, FTAG, &clone));
2273b2aab1Matthew Ahrens		if (clone->ds_dir->dd_origin_txg > mintxg) {
2283b2aab1Matthew Ahrens			dsl_deadlist_remove_key(&clone->ds_deadlist,
2293b2aab1Matthew Ahrens			    mintxg, tx);
2303b2aab1Matthew Ahrens			dsl_dataset_remove_clones_key(clone, mintxg, tx);
2313b2aab1Matthew Ahrens		}
2323b2aab1Matthew Ahrens		dsl_dataset_rele(clone, FTAG);
2333b2aab1Matthew Ahrens	}
2343b2aab1Matthew Ahrens	zap_cursor_fini(&zc);
2353b2aab1Matthew Ahrens}
2363b2aab1Matthew Ahrens
2373b2aab1Matthew Ahrensvoid
2383b2aab1Matthew Ahrensdsl_destroy_snapshot_sync_impl(dsl_dataset_t *ds, boolean_t defer, dmu_tx_t *tx)
2393b2aab1Matthew Ahrens{
2403b2aab1Matthew Ahrens	int err;
2413b2aab1Matthew Ahrens	int after_branch_point = FALSE;
2423b2aab1Matthew Ahrens	dsl_pool_t *dp = ds->ds_dir->dd_pool;
2433b2aab1Matthew Ahrens	objset_t *mos = dp->dp_meta_objset;
2443b2aab1Matthew Ahrens	dsl_dataset_t *ds_prev = NULL;
2453b2aab1Matthew Ahrens	uint64_t obj;
2463b2aab1Matthew Ahrens
2473b2aab1Matthew Ahrens	ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock));
2483b2aab1Matthew Ahrens	ASSERT3U(ds->ds_phys->ds_bp.blk_birth, <=, tx->tx_txg);
2493b2aab1Matthew Ahrens	ASSERT(refcount_is_zero(&ds->ds_longholds));
2503b2aab1Matthew Ahrens
2513b2aab1Matthew Ahrens	if (defer &&
2523b2aab1Matthew Ahrens	    (ds->ds_userrefs > 0 || ds->ds_phys->ds_num_children > 1)) {
2533b2aab1Matthew Ahrens		ASSERT(spa_version(dp->dp_spa) >= SPA_VERSION_USERREFS);
2543b2aab1Matthew Ahrens		dmu_buf_will_dirty(ds->ds_dbuf, tx);
2553b2aab1Matthew Ahrens		ds->ds_phys->ds_flags |= DS_FLAG_DEFER_DESTROY;
2563b2aab1Matthew Ahrens		spa_history_log_internal_ds(ds, "defer_destroy", tx, "");
2573b2aab1Matthew Ahrens		return;
2583b2aab1Matthew Ahrens	}
2593b2aab1Matthew Ahrens
2603b2aab1Matthew Ahrens	ASSERT3U(ds->ds_phys->ds_num_children, <=, 1);
2613b2aab1Matthew Ahrens
2623b2aab1Matthew Ahrens	/* We need to log before removing it from the namespace. */
2633b2aab1Matthew Ahrens	spa_history_log_internal_ds(ds, "destroy", tx, "");
2643b2aab1Matthew Ahrens
2653b2aab1Matthew Ahrens	dsl_scan_ds_destroyed(ds, tx);
2663b2aab1Matthew Ahrens
2673b2aab1Matthew Ahrens	obj = ds->ds_object;
2683b2aab1Matthew Ahrens
2693b2aab1Matthew Ahrens	if (ds->ds_phys->ds_prev_snap_obj != 0) {
2703b2aab1Matthew Ahrens		ASSERT3P(ds->ds_prev, ==, NULL);
2713b2aab1Matthew Ahrens		VERIFY0(dsl_dataset_hold_obj(dp,
2723b2aab1Matthew Ahrens		    ds->ds_phys->ds_prev_snap_obj, FTAG, &ds_prev));
2733b2aab1Matthew Ahrens		after_branch_point =
2743b2aab1Matthew Ahrens		    (ds_prev->ds_phys->ds_next_snap_obj != obj);
2753b2aab1Matthew Ahrens
2763b2aab1Matthew Ahrens		dmu_buf_will_dirty(ds_prev->ds_dbuf, tx);
2773b2aab1Matthew Ahrens		if (after_branch_point &&
2783b2aab1Matthew Ahrens		    ds_prev->ds_phys->ds_next_clones_obj != 0) {
2793b2aab1Matthew Ahrens			dsl_dataset_remove_from_next_clones(ds_prev, obj, tx);
2803b2aab1Matthew Ahrens			if (ds->ds_phys->ds_next_snap_obj != 0) {
2813b2aab1Matthew Ahrens				VERIFY0(zap_add_int(mos,
2823b2aab1Matthew Ahrens				    ds_prev->ds_phys->ds_next_clones_obj,
2833b2aab1Matthew Ahrens				    ds->ds_phys->ds_next_snap_obj, tx));
2843b2aab1Matthew Ahrens			}
2853b2aab1Matthew Ahrens		}
2863b2aab1Matthew Ahrens		if (!after_branch_point) {
2873b2aab1Matthew Ahrens			ds_prev->ds_phys->ds_next_snap_obj =
2883b2aab1Matthew Ahrens			    ds->ds_phys->ds_next_snap_obj;
2893b2aab1Matthew Ahrens		}
2903b2aab1Matthew Ahrens	}
2913b2aab1Matthew Ahrens
2923b2aab1Matthew Ahrens	dsl_dataset_t *ds_next;
2933b2aab1Matthew Ahrens	uint64_t old_unique;
2943b2aab1Matthew Ahrens	uint64_t used = 0, comp = 0, uncomp = 0;
2953b2aab1Matthew Ahrens
2963b2aab1Matthew Ahrens	VERIFY0(dsl_dataset_hold_obj(dp,
2973b2aab1Matthew Ahrens	    ds->ds_phys->ds_next_snap_obj, FTAG, &ds_next));
2983b2aab1Matthew Ahrens	ASSERT3U(ds_next->ds_phys->ds_prev_snap_obj, ==, obj);
2993b2aab1Matthew Ahrens
3003b2aab1Matthew Ahrens	old_unique = ds_next->ds_phys->ds_unique_bytes;
3013b2aab1Matthew Ahrens
3023b2aab1Matthew Ahrens	dmu_buf_will_dirty(ds_next->ds_dbuf, tx);
3033b2aab1Matthew Ahrens	ds_next->ds_phys->ds_prev_snap_obj =
3043b2aab1Matthew Ahrens	    ds->ds_phys->ds_prev_snap_obj;
3053b2aab1Matthew Ahrens	ds_next->ds_phys->ds_prev_snap_txg =
3063b2aab1Matthew Ahrens	    ds->ds_phys->ds_prev_snap_txg;
3073b2aab1Matthew Ahrens	ASSERT3U(ds->ds_phys->ds_prev_snap_txg, ==,
3083b2aab1Matthew Ahrens	    ds_prev ? ds_prev->ds_phys->ds_creation_txg : 0);
3093b2aab1Matthew Ahrens
3103b2aab1Matthew Ahrens	if (ds_next->ds_deadlist.dl_oldfmt) {
3113b2aab1Matthew Ahrens		process_old_deadlist(ds, ds_prev, ds_next,
3123b2aab1Matthew Ahrens		    after_branch_point, tx);
3133b2aab1Matthew Ahrens	} else {
3143b2aab1Matthew Ahrens		/* Adjust prev's unique space. */
3153b2aab1Matthew Ahrens		if (ds_prev && !after_branch_point) {
3163b2aab1Matthew Ahrens			dsl_deadlist_space_range(&ds_next->ds_deadlist,
3173b2aab1Matthew Ahrens			    ds_prev->ds_phys->ds_prev_snap_txg,
3183b2aab1Matthew Ahrens			    ds->ds_phys->ds_prev_snap_txg,
3193b2aab1Matthew Ahrens			    &used, &comp, &uncomp);
3203b2aab1Matthew Ahrens			ds_prev->ds_phys->ds_unique_bytes += used;
3213b2aab1Matthew Ahrens		}
3223b2aab1Matthew Ahrens
3233b2aab1Matthew Ahrens		/* Adjust snapused. */
3243b2aab1Matthew Ahrens		dsl_deadlist_space_range(&ds_next->ds_deadlist,
3253b2aab1Matthew Ahrens		    ds->ds_phys->ds_prev_snap_txg, UINT64_MAX,
3263b2aab1Matthew Ahrens		    &used, &comp, &uncomp);
3273b2aab1Matthew Ahrens		dsl_dir_diduse_space(ds->ds_dir, DD_USED_SNAP,
3283b2aab1Matthew Ahrens		    -used, -comp, -uncomp, tx);
3293b2aab1Matthew Ahrens
3303b2aab1Matthew Ahrens		/* Move blocks to be freed to pool's free list. */
3313b2aab1Matthew Ahrens		dsl_deadlist_move_bpobj(&ds_next->ds_deadlist,
3323b2aab1Matthew Ahrens		    &dp->dp_free_bpobj, ds->ds_phys->ds_prev_snap_txg,
3333b2aab1Matthew Ahrens		    tx);
3343b2aab1Matthew Ahrens		dsl_dir_diduse_space(tx->tx_pool->dp_free_dir,
3353b2aab1Matthew Ahrens		    DD_USED_HEAD, used, comp, uncomp, tx);
3363b2aab1Matthew Ahrens
3373b2aab1Matthew Ahrens		/* Merge our deadlist into next's and free it. */
3383b2aab1Matthew Ahrens		dsl_deadlist_merge(&ds_next->ds_deadlist,
3393b2aab1Matthew Ahrens		    ds->ds_phys->ds_deadlist_obj, tx);
3403b2aab1Matthew Ahrens	}
3413b2aab1Matthew Ahrens	dsl_deadlist_close(&ds->ds_deadlist);
3423b2aab1Matthew Ahrens	dsl_deadlist_free(mos, ds->ds_phys->ds_deadlist_obj, tx);
3433b2aab1Matthew Ahrens	dmu_buf_will_dirty(ds->ds_dbuf, tx);
3443b2aab1Matthew Ahrens	ds->ds_phys->ds_deadlist_obj = 0;
3453b2aab1Matthew Ahrens
3463b2aab1Matthew Ahrens	/* Collapse range in clone heads */
3473b2aab1Matthew Ahrens	dsl_dataset_remove_clones_key(ds,
3483b2aab1Matthew Ahrens	    ds->ds_phys->ds_creation_txg, tx);
3493b2aab1Matthew Ahrens
3503b2aab1Matthew Ahrens	if (dsl_dataset_is_snapshot(ds_next)) {
3513b2aab1Matthew Ahrens		dsl_dataset_t *ds_nextnext;
3523b2aab1Matthew Ahrens
3533b2aab1Matthew Ahrens		/*
3543b2aab1Matthew Ahrens		 * Update next's unique to include blocks which
3553b2aab1Matthew Ahrens		 * were previously shared by only this snapshot
3563b2aab1Matthew Ahrens		 * and it.  Those blocks will be born after the
3573b2aab1Matthew Ahrens		 * prev snap and before this snap, and will have
3583b2aab1Matthew Ahrens		 * died after the next snap and before the one
3593b2aab1Matthew Ahrens		 * after that (ie. be on the snap after next's
3603b2aab1Matthew Ahrens		 * deadlist).
3613b2aab1Matthew Ahrens		 */
3623b2aab1Matthew Ahrens		VERIFY0(dsl_dataset_hold_obj(dp,
3633b2aab1Matthew Ahrens		    ds_next->ds_phys->ds_next_snap_obj, FTAG, &ds_nextnext));
3643b2aab1Matthew Ahrens		dsl_deadlist_space_range(&ds_nextnext->ds_deadlist,
3653b2aab1Matthew Ahrens		    ds->ds_phys->ds_prev_snap_txg,
3663b2aab1Matthew Ahrens		    ds->ds_phys->ds_creation_txg,
3673b2aab1Matthew Ahrens		    &used, &comp, &uncomp);
3683b2aab1Matthew Ahrens		ds_next->ds_phys->ds_unique_bytes += used;
3693b2aab1Matthew Ahrens		dsl_dataset_rele(ds_nextnext, FTAG);
3703b2aab1Matthew Ahrens		ASSERT3P(ds_next->ds_prev, ==, NULL);
3713b2aab1Matthew Ahrens
3723b2aab1Matthew Ahrens		/* Collapse range in this head. */
3733b2aab1Matthew Ahrens		dsl_dataset_t *hds;
3743b2aab1Matthew Ahrens		VERIFY0(dsl_dataset_hold_obj(dp,
3753b2aab1Matthew Ahrens		    ds->ds_dir->dd_phys->dd_head_dataset_obj, FTAG, &hds));
3763b2aab1Matthew Ahrens		dsl_deadlist_remove_key(&hds->ds_deadlist,
3773b2aab1Matthew Ahrens		    ds->ds_phys->ds_creation_txg, tx);
3783b2aab1Matthew Ahrens		dsl_dataset_rele(hds, FTAG);
3793b2aab1Matthew Ahrens
3803b2aab1Matthew Ahrens	} else {
3813b2aab1Matthew Ahrens		ASSERT3P(ds_next->ds_prev, ==, ds);
3823b2aab1Matthew Ahrens		dsl_dataset_rele(ds_next->ds_prev, ds_next);
3833b2aab1Matthew Ahrens		ds_next->ds_prev = NULL;
3843b2aab1Matthew Ahrens		if (ds_prev) {
3853b2aab1Matthew Ahrens			VERIFY0(dsl_dataset_hold_obj(dp,
3863b2aab1Matthew Ahrens			    ds->ds_phys->ds_prev_snap_obj,
3873b2aab1Matthew Ahrens			    ds_next, &ds_next->ds_prev));
3883b2aab1Matthew Ahrens		}
3893b2aab1Matthew Ahrens
3903b2aab1Matthew Ahrens		dsl_dataset_recalc_head_uniq(ds_next);
3913b2aab1Matthew Ahrens
3923b2aab1Matthew Ahrens		/*
3933b2aab1Matthew Ahrens		 * Reduce the amount of our unconsumed refreservation
3943b2aab1Matthew Ahrens		 * being charged to our parent by the amount of
3953b2aab1Matthew Ahrens		 * new unique data we have gained.
3963b2aab1Matthew Ahrens		 */
3973b2aab1Matthew Ahrens		if (old_unique < ds_next->ds_reserved) {
3983b2aab1Matthew Ahrens			int64_t mrsdelta;
3993b2aab1Matthew Ahrens			uint64_t new_unique =
4003b2aab1Matthew Ahrens			    ds_next->ds_phys->ds_unique_bytes;
4013b2aab1Matthew Ahrens
4023b2aab1Matthew Ahrens			ASSERT(old_unique <= new_unique);
4033b2aab1Matthew Ahrens			mrsdelta = MIN(new_unique - old_unique,
4043b2aab1Matthew Ahrens			    ds_next->ds_reserved - old_unique);
4053b2aab1Matthew Ahrens			dsl_dir_diduse_space(ds->ds_dir,
4063b2aab1Matthew Ahrens			    DD_USED_REFRSRV, -mrsdelta, 0, 0, tx);
4073b2aab1Matthew Ahrens		}
4083b2aab1Matthew Ahrens	}
4093b2aab1Matthew Ahrens	dsl_dataset_rele(ds_next, FTAG);
4103b2aab1Matthew Ahrens
4113b2aab1Matthew Ahrens	/*
4123b2aab1Matthew Ahrens	 * This must be done after the dsl_traverse(), because it will
4133b2aab1Matthew Ahrens	 * re-open the objset.
4143b2aab1Matthew Ahrens	 */
4153b2aab1Matthew Ahrens	if (ds->ds_objset) {
4163b2aab1Matthew Ahrens		dmu_objset_evict(ds->ds_objset);
4173b2aab1Matthew Ahrens		ds->ds_objset = NULL;
4183b2aab1Matthew Ahrens	}
4193b2aab1Matthew Ahrens
4203b2aab1Matthew Ahrens	/* remove from snapshot namespace */
4213b2aab1Matthew Ahrens	dsl_dataset_t *ds_head;
4223b2aab1Matthew Ahrens	ASSERT(ds->ds_phys->ds_snapnames_zapobj == 0);
4233b2aab1Matthew Ahrens	VERIFY0(dsl_dataset_hold_obj(dp,
4243b2aab1Matthew Ahrens	    ds->ds_dir->dd_phys->dd_head_dataset_obj, FTAG, &ds_head));
4253b2aab1Matthew Ahrens	VERIFY0(dsl_dataset_get_snapname(ds));
4263b2aab1Matthew Ahrens#ifdef ZFS_DEBUG
4273b2aab1Matthew Ahrens	{
4283b2aab1Matthew Ahrens		uint64_t val;
4293b2aab1Matthew Ahrens
4303b2aab1Matthew Ahrens		err = dsl_dataset_snap_lookup(ds_head,
4313b2aab1Matthew Ahrens		    ds->ds_snapname, &val);
4323b2aab1Matthew Ahrens		ASSERT0(err);
4333b2aab1Matthew Ahrens		ASSERT3U(val, ==, obj);
4343b2aab1Matthew Ahrens	}
4353b2aab1Matthew Ahrens#endif
4363b2aab1Matthew Ahrens	VERIFY0(dsl_dataset_snap_remove(ds_head, ds->ds_snapname, tx));
4373b2aab1Matthew Ahrens	dsl_dataset_rele(ds_head, FTAG);
4383b2aab1Matthew Ahrens
4393b2aab1Matthew Ahrens	if (ds_prev != NULL)
4403b2aab1Matthew Ahrens		dsl_dataset_rele(ds_prev, FTAG);
4413b2aab1Matthew Ahrens
4423b2aab1Matthew Ahrens	spa_prop_clear_bootfs(dp->dp_spa, ds->ds_object, tx);
4433b2aab1Matthew Ahrens
4443b2aab1Matthew Ahrens	if (ds->ds_phys->ds_next_clones_obj != 0) {
4453b2aab1Matthew Ahrens		uint64_t count;
4463b2aab1Matthew Ahrens		ASSERT0(zap_count(mos,
4473b2aab1Matthew Ahrens		    ds->ds_phys->ds_next_clones_obj, &count) && count == 0);
4483b2aab1Matthew Ahrens		VERIFY0(dmu_object_free(mos,
4493b2aab1Matthew Ahrens		    ds->ds_phys->ds_next_clones_obj, tx));
4503b2aab1Matthew Ahrens	}
4513b2aab1Matthew Ahrens	if (ds->ds_phys->ds_props_obj != 0)
4523b2aab1Matthew Ahrens		VERIFY0(zap_destroy(mos, ds->ds_phys->ds_props_obj, tx));
4533b2aab1Matthew Ahrens	if (ds->ds_phys->ds_userrefs_obj != 0)
4543b2aab1Matthew Ahrens		VERIFY0(zap_destroy(mos, ds->ds_phys->ds_userrefs_obj, tx));
4553b2aab1Matthew Ahrens	dsl_dir_rele(ds->ds_dir, ds);
4563b2aab1Matthew Ahrens	ds->ds_dir = NULL;
4573b2aab1Matthew Ahrens	VERIFY0(dmu_object_free(mos, obj, tx));
4583b2aab1Matthew Ahrens}
4593b2aab1Matthew Ahrens
4603b2aab1Matthew Ahrensstatic void
4613b2aab1Matthew Ahrensdsl_destroy_snapshot_sync(void *arg, dmu_tx_t *tx)
4623b2aab1Matthew Ahrens{
4633b2aab1Matthew Ahrens	dmu_snapshots_destroy_arg_t *dsda = arg;
4643b2aab1Matthew Ahrens	dsl_pool_t *dp = dmu_tx_pool(tx);
4653b2aab1Matthew Ahrens	nvpair_t *pair;
4663b2aab1Matthew Ahrens
4673b2aab1Matthew Ahrens	for (pair = nvlist_next_nvpair(dsda->dsda_successful_snaps, NULL);
4683b2aab1Matthew Ahrens	    pair != NULL;
4693b2aab1Matthew Ahrens	    pair = nvlist_next_nvpair(dsda->dsda_successful_snaps, pair)) {
4703b2aab1Matthew Ahrens		dsl_dataset_t *ds;
4713b2aab1Matthew Ahrens
4723b2aab1Matthew Ahrens		VERIFY0(dsl_dataset_hold(dp, nvpair_name(pair), FTAG, &ds));
4733b2aab1Matthew Ahrens
4743b2aab1Matthew Ahrens		dsl_destroy_snapshot_sync_impl(ds, dsda->dsda_defer, tx);
4753b2aab1Matthew Ahrens		dsl_dataset_rele(ds, FTAG);
4763b2aab1Matthew Ahrens	}
4773b2aab1Matthew Ahrens}
4783b2aab1Matthew Ahrens
4793b2aab1Matthew Ahrens/*
4803b2aab1Matthew Ahrens * The semantics of this function are described in the comment above
4813b2aab1Matthew Ahrens * lzc_destroy_snaps().  To summarize:
4823b2aab1Matthew Ahrens *
4833b2aab1Matthew Ahrens * The snapshots must all be in the same pool.
4843b2aab1Matthew Ahrens *
4853b2aab1Matthew Ahrens * Snapshots that don't exist will be silently ignored (considered to be
4863b2aab1Matthew Ahrens * "already deleted").
4873b2aab1Matthew Ahrens *
4883b2aab1Matthew Ahrens * On success, all snaps will be destroyed and this will return 0.
4893b2aab1Matthew Ahrens * On failure, no snaps will be destroyed, the errlist will be filled in,
4903b2aab1Matthew Ahrens * and this will return an errno.
4913b2aab1Matthew Ahrens */
4923b2aab1Matthew Ahrensint
4933b2aab1Matthew Ahrensdsl_destroy_snapshots_nvl(nvlist_t *snaps, boolean_t defer,
4943b2aab1Matthew Ahrens    nvlist_t *errlist)
4953b2aab1Matthew Ahrens{
4963b2aab1Matthew Ahrens	dmu_snapshots_destroy_arg_t dsda;
4973b2aab1Matthew Ahrens	int error;
4983b2aab1Matthew Ahrens	nvpair_t *pair;
4993b2aab1Matthew Ahrens
5003b2aab1Matthew Ahrens	pair = nvlist_next_nvpair(snaps, NULL);
5013b2aab1Matthew Ahrens	if (pair == NULL)
5023b2aab1Matthew Ahrens		return (0);
5033b2aab1Matthew Ahrens
5043b2aab1Matthew Ahrens	dsda.dsda_snaps = snaps;
5053b2aab1Matthew Ahrens	dsda.dsda_successful_snaps = fnvlist_alloc();
5063b2aab1Matthew Ahrens	dsda.dsda_defer = defer;
5073b2aab1Matthew Ahrens	dsda.dsda_errlist = errlist;
5083b2aab1Matthew Ahrens
5093b2aab1Matthew Ahrens	error = dsl_sync_task(nvpair_name(pair),
5103b2aab1Matthew Ahrens	    dsl_destroy_snapshot_check, dsl_destroy_snapshot_sync,
5113b2aab1Matthew Ahrens	    &dsda, 0);
5123b2aab1Matthew Ahrens	fnvlist_free(dsda.dsda_successful_snaps);
5133b2aab1Matthew Ahrens
5143b2aab1Matthew Ahrens	return (error);
5153b2aab1Matthew Ahrens}
5163b2aab1Matthew Ahrens
5173b2aab1Matthew Ahrensint
5183b2aab1Matthew Ahrensdsl_destroy_snapshot(const char *name, boolean_t defer)
5193b2aab1Matthew Ahrens{
5203b2aab1Matthew Ahrens	int error;
5213b2aab1Matthew Ahrens	nvlist_t *nvl = fnvlist_alloc();
5223b2aab1Matthew Ahrens	nvlist_t *errlist = fnvlist_alloc();
5233b2aab1Matthew Ahrens
5243b2aab1Matthew Ahrens	fnvlist_add_boolean(nvl, name);
5253b2aab1Matthew Ahrens	error = dsl_destroy_snapshots_nvl(nvl, defer, errlist);
5263b2aab1Matthew Ahrens	fnvlist_free(errlist);
5273b2aab1Matthew Ahrens	fnvlist_free(nvl);
5283b2aab1Matthew Ahrens	return (error);
5293b2aab1Matthew Ahrens}
5303b2aab1Matthew Ahrens
5313b2aab1Matthew Ahrensstruct killarg {
5323b2aab1Matthew Ahrens	dsl_dataset_t *ds;
5333b2aab1Matthew Ahrens	dmu_tx_t *tx;
5343b2aab1Matthew Ahrens};
5353b2aab1Matthew Ahrens
5363b2aab1Matthew Ahrens/* ARGSUSED */
5373b2aab1Matthew Ahrensstatic int
5383b2aab1Matthew Ahrenskill_blkptr(spa_t *spa, zilog_t *zilog, const blkptr_t *bp,
5393b2aab1Matthew Ahrens    const zbookmark_t *zb, const dnode_phys_t *dnp, void *arg)
5403b2aab1Matthew Ahrens{
5413b2aab1Matthew Ahrens	struct killarg *ka = arg;
5423b2aab1Matthew Ahrens	dmu_tx_t *tx = ka->tx;
5433b2aab1Matthew Ahrens
5443b2aab1Matthew Ahrens	if (bp == NULL)
5453b2aab1Matthew Ahrens		return (0);
5463b2aab1Matthew Ahrens
5473b2aab1Matthew Ahrens	if (zb->zb_level == ZB_ZIL_LEVEL) {
5483b2aab1Matthew Ahrens		ASSERT(zilog != NULL);
5493b2aab1Matthew Ahrens		/*
5503b2aab1Matthew Ahrens		 * It's a block in the intent log.  It has no
5513b2aab1Matthew Ahrens		 * accounting, so just free it.
5523b2aab1Matthew Ahrens		 */
5533b2aab1Matthew Ahrens		dsl_free(ka->tx->tx_pool, ka->tx->tx_txg, bp);
5543b2aab1Matthew Ahrens	} else {
5553b2aab1Matthew Ahrens		ASSERT(zilog == NULL);
5563b2aab1Matthew Ahrens		ASSERT3U(bp->blk_birth, >, ka->ds->ds_phys->ds_prev_snap_txg);
5573b2aab1Matthew Ahrens		(void) dsl_dataset_block_kill(ka->ds, bp, tx, B_FALSE);
5583b2aab1Matthew Ahrens	}
5593b2aab1Matthew Ahrens
5603b2aab1Matthew Ahrens	return (0);
5613b2aab1Matthew Ahrens}
5623b2aab1Matthew Ahrens
5633b2aab1Matthew Ahrensstatic void
5643b2aab1Matthew Ahrensold_synchronous_dataset_destroy(dsl_dataset_t *ds, dmu_tx_t *tx)
5653b2aab1Matthew Ahrens{
5663b2aab1Matthew Ahrens	struct killarg ka;
5673b2aab1Matthew Ahrens
5683b2aab1Matthew Ahrens	/*
5693b2aab1Matthew Ahrens	 * Free everything that we point to (that's born after
5703b2aab1Matthew Ahrens	 * the previous snapshot, if we are a clone)
5713b2aab1Matthew Ahrens	 *
5723b2aab1Matthew Ahrens	 * NB: this should be very quick, because we already
5733b2aab1Matthew Ahrens	 * freed all the objects in open context.
5743b2aab1Matthew Ahrens	 */
5753b2aab1Matthew Ahrens	ka.ds = ds;
5763b2aab1Matthew Ahrens	ka.tx = tx;
5773b2aab1Matthew Ahrens	VERIFY0(traverse_dataset(ds,
5783b2aab1Matthew Ahrens	    ds->ds_phys->ds_prev_snap_txg, TRAVERSE_POST,
5793b2aab1Matthew Ahrens	    kill_blkptr, &ka));
5803b2aab1Matthew Ahrens	ASSERT(!DS_UNIQUE_IS_ACCURATE(ds) || ds->ds_phys->ds_unique_bytes == 0);
5813b2aab1Matthew Ahrens}
5823b2aab1Matthew Ahrens
5833b2aab1Matthew Ahrenstypedef struct dsl_destroy_head_arg {
5843b2aab1Matthew Ahrens	const char *ddha_name;
5853b2aab1Matthew Ahrens} dsl_destroy_head_arg_t;
5863b2aab1Matthew Ahrens
5873b2aab1Matthew Ahrensint
5883b2aab1Matthew Ahrensdsl_destroy_head_check_impl(dsl_dataset_t *ds, int expected_holds)
5893b2aab1Matthew Ahrens{
5903b2aab1Matthew Ahrens	int error;
5913b2aab1Matthew Ahrens	uint64_t count;
5923b2aab1Matthew Ahrens	objset_t *mos;
5933b2aab1Matthew Ahrens
5943b2aab1Matthew Ahrens	if (dsl_dataset_is_snapshot(ds))
595be6fd75Matthew Ahrens		return (SET_ERROR(EINVAL));
5963b2aab1Matthew Ahrens
5973b2aab1Matthew Ahrens	if (refcount_count(&ds->ds_longholds) != expected_holds)
598be6fd75Matthew Ahrens		return (SET_ERROR(EBUSY));
5993b2aab1Matthew Ahrens
6003b2aab1Matthew Ahrens	mos = ds->ds_dir->dd_pool->dp_meta_objset;
6013b2aab1Matthew Ahrens
6023b2aab1Matthew Ahrens	/*
6033b2aab1Matthew Ahrens	 * Can't delete a head dataset if there are snapshots of it.
6043b2aab1Matthew Ahrens	 * (Except if the only snapshots are from the branch we cloned
6053b2aab1Matthew Ahrens	 * from.)
6063b2aab1Matthew Ahrens	 */
6073b2aab1Matthew Ahrens	if (ds->ds_prev != NULL &&
6083b2aab1Matthew Ahrens	    ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object)
609be6fd75Matthew Ahrens		return (SET_ERROR(EBUSY));
6103b2aab1Matthew Ahrens
6113b2aab1Matthew Ahrens	/*
6123b2aab1Matthew Ahrens	 * Can't delete if there are children of this fs.
6133b2aab1Matthew Ahrens	 */
6143b2aab1Matthew Ahrens	error = zap_count(mos,
6153b2aab1Matthew Ahrens	    ds->ds_dir->dd_phys->dd_child_dir_zapobj, &count);
6163b2aab1Matthew Ahrens	if (error != 0)
6173b2aab1Matthew Ahrens		return (error);
6183b2aab1Matthew Ahrens	if (count != 0)
619be6fd75Matthew Ahrens		return (SET_ERROR(EEXIST));
6203b2aab1Matthew Ahrens
6213b2aab1Matthew Ahrens	if (dsl_dir_is_clone(ds->ds_dir) && DS_IS_DEFER_DESTROY(ds->ds_prev) &&
6223b2aab1Matthew Ahrens	    ds->ds_prev->ds_phys->ds_num_children == 2 &&
6233b2aab1Matthew Ahrens	    ds->ds_prev->ds_userrefs == 0) {
6243b2aab1Matthew Ahrens		/* We need to remove the origin snapshot as well. */
6253b2aab1Matthew Ahrens		if (!refcount_is_zero(&ds->ds_prev->ds_longholds))
626be6fd75Matthew Ahrens			return (SET_ERROR(EBUSY));
6273b2aab1Matthew Ahrens	}
6283b2aab1Matthew Ahrens	return (0);
6293b2aab1Matthew Ahrens}
6303b2aab1Matthew Ahrens
6313b2aab1Matthew Ahrensstatic int
6323b2aab1Matthew Ahrensdsl_destroy_head_check(void *arg, dmu_tx_t *tx)
6333b2aab1Matthew Ahrens{
6343b2aab1Matthew Ahrens	dsl_destroy_head_arg_t *ddha = arg;
6353b2aab1Matthew Ahrens	dsl_pool_t *dp = dmu_tx_pool(tx);
6363b2aab1Matthew Ahrens	dsl_dataset_t *ds;
6373b2aab1Matthew Ahrens	int error;
6383b2aab1Matthew Ahrens
6393b2aab1Matthew Ahrens	error = dsl_dataset_hold(dp, ddha->ddha_name, FTAG, &ds);
6403b2aab1Matthew Ahrens	if (error != 0)
6413b2aab1Matthew Ahrens		return (error);
6423b2aab1Matthew Ahrens
6433b2aab1Matthew Ahrens	error = dsl_destroy_head_check_impl(ds, 0);
6443b2aab1Matthew Ahrens	dsl_dataset_rele(ds, FTAG);
6453b2aab1Matthew Ahrens	return (error);
6463b2aab1Matthew Ahrens}
6473b2aab1Matthew Ahrens
6483b2aab1Matthew Ahrensstatic void
6493b2aab1Matthew Ahrensdsl_dir_destroy_sync(uint64_t ddobj, dmu_tx_t *tx)
6503b2aab1Matthew Ahrens{
6513b2aab1Matthew Ahrens	dsl_dir_t *dd;
6523b2aab1Matthew Ahrens	dsl_pool_t *dp = dmu_tx_pool(tx);
6533b2aab1Matthew Ahrens	objset_t *mos = dp->dp_meta_objset;
6543b2aab1Matthew Ahrens	dd_used_t t;
6553b2aab1Matthew Ahrens
6563b2aab1Matthew Ahrens	ASSERT(RRW_WRITE_HELD(&dmu_tx_pool(tx)->dp_config_rwlock));
6573b2aab1Matthew Ahrens
6583b2aab1Matthew Ahrens	VERIFY0(dsl_dir_hold_obj(dp, ddobj, NULL, FTAG, &dd));
6593b2aab1Matthew Ahrens
6603b2aab1Matthew Ahrens	ASSERT0(dd->dd_phys->dd_head_dataset_obj);
6613b2aab1Matthew Ahrens
6623b2aab1Matthew Ahrens	/*
6633b2aab1Matthew Ahrens	 * Remove our reservation. The impl() routine avoids setting the
6643b2aab1Matthew Ahrens	 * actual property, which would require the (already destroyed) ds.
6653b2aab1Matthew Ahrens	 */
6663b2aab1Matthew Ahrens	dsl_dir_set_reservation_sync_impl(dd, 0, tx);
6673b2aab1Matthew Ahrens
6683b2aab1Matthew Ahrens	ASSERT0(dd->dd_phys->dd_used_bytes);
6693b2aab1Matthew Ahrens	ASSERT0(dd->dd_phys->dd_reserved);
6703b2aab1Matthew Ahrens	for (t = 0; t < DD_USED_NUM; t++)
6713b2aab1Matthew Ahrens		ASSERT0(dd->dd_phys->dd_used_breakdown[t]);
6723b2aab1Matthew Ahrens
6733b2aab1Matthew Ahrens	VERIFY0(zap_destroy(mos, dd->dd_phys->dd_child_dir_zapobj, tx));
6743b2aab1Matthew Ahrens	VERIFY0(zap_destroy(mos, dd->dd_phys->dd_props_zapobj, tx));
6753b2aab1Matthew Ahrens	VERIFY0(dsl_deleg_destroy(mos, dd->dd_phys->dd_deleg_zapobj, tx));
6763b2aab1Matthew Ahrens	VERIFY0(zap_remove(mos,
6773b2aab1Matthew Ahrens	    dd->dd_parent->dd_phys->dd_child_dir_zapobj, dd->dd_myname, tx));
6783b2aab1Matthew Ahrens
6793b2aab1Matthew Ahrens	dsl_dir_rele(dd, FTAG);
6803b2aab1Matthew Ahrens	VERIFY0(dmu_object_free(mos, ddobj, tx));
6813b2aab1Matthew Ahrens}
6823b2aab1Matthew Ahrens
6833b2aab1Matthew Ahrensvoid
6843b2aab1Matthew Ahrensdsl_destroy_head_sync_impl(dsl_dataset_t *ds, dmu_tx_t *tx)
6853b2aab1Matthew Ahrens{
6863b2aab1Matthew Ahrens	dsl_pool_t *dp = dmu_tx_pool(tx);
6873b2aab1Matthew Ahrens	objset_t *mos = dp->dp_meta_objset;
6883b2aab1Matthew Ahrens	uint64_t obj, ddobj, prevobj = 0;
6893b2aab1Matthew Ahrens	boolean_t rmorigin;
6903b2aab1Matthew Ahrens
6913b2aab1Matthew Ahrens	ASSERT3U(ds->ds_phys->ds_num_children, <=, 1);
6923b2aab1Matthew Ahrens	ASSERT(ds->ds_prev == NULL ||
6933b2aab1Matthew Ahrens	    ds->ds_prev->ds_phys->ds_next_snap_obj != ds->ds_object);
6943b2aab1Matthew Ahrens	ASSERT3U(ds->ds_phys->ds_bp.blk_birth, <=, tx->tx_txg);
6953b2aab1Matthew Ahrens	ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock));
6963b2aab1Matthew Ahrens
6973b2aab1Matthew Ahrens	/* We need to log before removing it from the namespace. */
6983b2aab1Matthew Ahrens	spa_history_log_internal_ds(ds, "destroy", tx, "");
6993b2aab1Matthew Ahrens
7003b2aab1Matthew Ahrens	rmorigin = (dsl_dir_is_clone(ds->ds_dir) &&
7013b2aab1Matthew Ahrens	    DS_IS_DEFER_DESTROY(ds->ds_prev) &&
7023b2aab1Matthew Ahrens	    ds->ds_prev->ds_phys->ds_num_children == 2 &&
7033b2aab1Matthew Ahrens	    ds->ds_prev->ds_userrefs == 0);
7043b2aab1Matthew Ahrens
7053b2aab1Matthew Ahrens	/* Remove our reservation */
7063b2aab1Matthew Ahrens	if (ds->ds_reserved != 0) {
7073b2aab1Matthew Ahrens		dsl_dataset_set_refreservation_sync_impl(ds,
7083b2aab1Matthew Ahrens		    (ZPROP_SRC_NONE | ZPROP_SRC_LOCAL | ZPROP_SRC_RECEIVED),
7093b2aab1Matthew Ahrens		    0, tx);
7103b2aab1Matthew Ahrens		ASSERT0(ds->ds_reserved);
7113b2aab1Matthew Ahrens	}
7123b2aab1Matthew Ahrens
7133b2aab1Matthew Ahrens	dsl_scan_ds_destroyed(ds, tx);
7143b2aab1Matthew Ahrens
7153b2aab1Matthew Ahrens	obj = ds->ds_object;
7163b2aab1Matthew Ahrens
7173b2aab1Matthew Ahrens	if (ds->ds_phys->ds_prev_snap_obj != 0) {
7183b2aab1Matthew Ahrens		/* This is a clone */
7193b2aab1Matthew Ahrens		ASSERT(ds->ds_prev != NULL);
7203b2aab1Matthew Ahrens		ASSERT3U(ds->ds_prev->ds_phys->ds_next_snap_obj, !=, obj);
7213b2aab1Matthew Ahrens		ASSERT0(ds->ds_phys->ds_next_snap_obj);
7223b2aab1Matthew Ahrens
7233b2aab1Matthew Ahrens		dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx);
7243b2aab1Matthew Ahrens		if (ds->ds_prev->ds_phys->ds_next_clones_obj != 0) {
7253b2aab1Matthew Ahrens			dsl_dataset_remove_from_next_clones(ds->ds_prev,
7263b2aab1Matthew Ahrens			    obj, tx);
7273b2aab1Matthew Ahrens		}
7283b2aab1Matthew Ahrens
7293b2aab1Matthew Ahrens		ASSERT3U(ds->ds_prev->ds_phys->ds_num_children, >, 1);
7303b2aab1Matthew Ahrens		ds->ds_prev->ds_phys->ds_num_children--;
7313b2aab1Matthew Ahrens	}
7323b2aab1Matthew Ahrens
7333b2aab1Matthew Ahrens	zfeature_info_t *async_destroy =
7343b2aab1Matthew Ahrens	    &spa_feature_table[SPA_FEATURE_ASYNC_DESTROY];
7353b2aab1Matthew Ahrens	objset_t *os;
7363b2aab1Matthew Ahrens
7373b2aab1Matthew Ahrens	/*
7383b2aab1Matthew Ahrens	 * Destroy the deadlist.  Unless it's a clone, the
7393b2aab1Matthew Ahrens	 * deadlist should be empty.  (If it's a clone, it's
7403b2aab1Matthew Ahrens	 * safe to ignore the deadlist contents.)
7413b2aab1Matthew Ahrens	 */
7423b2aab1Matthew Ahrens	dsl_deadlist_close(&ds->ds_deadlist);
7433b2aab1Matthew Ahrens	dsl_deadlist_free(mos, ds->ds_phys->ds_deadlist_obj, tx);
7443b2aab1Matthew Ahrens	dmu_buf_will_dirty(ds->ds_dbuf, tx);
7453b2aab1Matthew Ahrens	ds->ds_phys->ds_deadlist_obj = 0;
7463b2aab1Matthew Ahrens
7473b2aab1Matthew Ahrens	VERIFY0(dmu_objset_from_ds(ds, &os));
7483b2aab1Matthew Ahrens
7493b2aab1Matthew Ahrens	if (!spa_feature_is_enabled(dp->dp_spa, async_destroy)) {
7503b2aab1Matthew Ahrens		old_synchronous_dataset_destroy(ds, tx);
7513b2aab1Matthew Ahrens	} else {
7523b2aab1Matthew Ahrens		/*
7533b2aab1Matthew Ahrens		 * Move the bptree into the pool's list of trees to
7543b2aab1Matthew Ahrens		 * clean up and update space accounting information.
7553b2aab1Matthew Ahrens		 */
7563b2aab1Matthew Ahrens		uint64_t used, comp, uncomp;
7573b2aab1Matthew Ahrens
7583b2aab1Matthew Ahrens		zil_destroy_sync(dmu_objset_zil(os), tx);
7593b2aab1Matthew Ahrens
7603b2aab1Matthew Ahrens		if (!spa_feature_is_active(dp->dp_spa, async_destroy)) {
7614a92375George Wilson			dsl_scan_t *scn = dp->dp_scan;
7624a92375George Wilson
7633b2aab1Matthew Ahrens			spa_feature_incr(dp->dp_spa, async_destroy, tx);
7643b2aab1Matthew Ahrens			dp->dp_bptree_obj = bptree_alloc(mos, tx);
7653b2aab1Matthew Ahrens			VERIFY0(zap_add(mos,
7663b2aab1Matthew Ahrens			    DMU_POOL_DIRECTORY_OBJECT,
7673b2aab1Matthew Ahrens			    DMU_POOL_BPTREE_OBJ, sizeof (uint64_t), 1,
7683b2aab1Matthew Ahrens			    &dp->dp_bptree_obj, tx));
7694a92375George Wilson			ASSERT(!scn->scn_async_destroying);
7704a92375George Wilson			scn->scn_async_destroying = B_TRUE;
7713b2aab1Matthew Ahrens		}
7723b2aab1Matthew Ahrens
7733b2aab1Matthew Ahrens		used = ds->ds_dir->dd_phys->dd_used_bytes;
7743b2aab1Matthew Ahrens		comp = ds->ds_dir->dd_phys->dd_compressed_bytes;
7753b2aab1Matthew Ahrens		uncomp = ds->ds_dir->dd_phys->dd_uncompressed_bytes;
7763b2aab1Matthew Ahrens
7773b2aab1Matthew Ahrens		ASSERT(!DS_UNIQUE_IS_ACCURATE(ds) ||
7783b2aab1Matthew Ahrens		    ds->ds_phys->ds_unique_bytes == used);
7793b2aab1Matthew Ahrens
7803b2aab1Matthew Ahrens		bptree_add(mos, dp->dp_bptree_obj,
7813b2aab1Matthew Ahrens		    &ds->ds_phys->ds_bp, ds->ds_phys->ds_prev_snap_txg,
7823b2aab1Matthew Ahrens		    used, comp, uncomp, tx);
7833b2aab1Matthew Ahrens		dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD,
7843b2aab1Matthew Ahrens		    -used, -comp, -uncomp, tx);
7853b2aab1Matthew Ahrens		dsl_dir_diduse_space(dp->dp_free_dir, DD_USED_HEAD,
7863b2aab1Matthew Ahrens		    used, comp, uncomp, tx);
7873b2aab1Matthew Ahrens	}
7883b2aab1Matthew Ahrens
7893b2aab1Matthew Ahrens	if (ds->ds_prev != NULL) {
7903b2aab1Matthew Ahrens		if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) {
7913b2aab1Matthew Ahrens			VERIFY0(zap_remove_int(mos,
7923b2aab1Matthew Ahrens			    ds->ds_prev->ds_dir->dd_phys->dd_clones,
7933b2aab1Matthew Ahrens			    ds->ds_object, tx));
7943b2aab1Matthew Ahrens		}
7953b2aab1Matthew Ahrens		prevobj = ds->ds_prev->ds_object;
7963b2aab1Matthew Ahrens		dsl_dataset_rele(ds->ds_prev, ds);
7973b2aab1Matthew Ahrens		ds->ds_prev = NULL;
7983b2aab1Matthew Ahrens	}
7993b2aab1Matthew Ahrens
8003b2aab1Matthew Ahrens	/*
8013b2aab1Matthew Ahrens	 * This must be done after the dsl_traverse(), because it will
8023b2aab1Matthew Ahrens	 * re-open the objset.
8033b2aab1Matthew Ahrens	 */
8043b2aab1Matthew Ahrens	if (ds->ds_objset) {
8053b2aab1Matthew Ahrens		dmu_objset_evict(ds->ds_objset);
8063b2aab1Matthew Ahrens		ds->ds_objset = NULL;
8073b2aab1Matthew Ahrens	}
808