diff --git a/include/sys/dsl_synctask.h b/include/sys/dsl_synctask.h
index 957963ffe5..0bb602e8f7 100644
--- a/include/sys/dsl_synctask.h
+++ b/include/sys/dsl_synctask.h
@@ -112,11 +112,11 @@ void dsl_sync_task_sync(dsl_sync_task_t *, dmu_tx_t *);
 int dsl_sync_task(const char *, dsl_checkfunc_t *,
     dsl_syncfunc_t *, void *, int, zfs_space_check_t);
 void dsl_sync_task_nowait(struct dsl_pool *, dsl_syncfunc_t *,
-    void *, int, zfs_space_check_t, dmu_tx_t *);
+    void *, dmu_tx_t *);
 int dsl_early_sync_task(const char *, dsl_checkfunc_t *,
     dsl_syncfunc_t *, void *, int, zfs_space_check_t);
 void dsl_early_sync_task_nowait(struct dsl_pool *, dsl_syncfunc_t *,
-    void *, int, zfs_space_check_t, dmu_tx_t *);
+    void *, dmu_tx_t *);
 int dsl_sync_task_sig(const char *, dsl_checkfunc_t *, dsl_syncfunc_t *,
     dsl_sigfunc_t *, void *, int, zfs_space_check_t);
 
diff --git a/module/zfs/dmu_redact.c b/module/zfs/dmu_redact.c
index df10d8d6fa..1c5f1bd248 100644
--- a/module/zfs/dmu_redact.c
+++ b/module/zfs/dmu_redact.c
@@ -568,8 +568,7 @@ commit_rl_updates(objset_t *os, struct merge_data *md, uint64_t object,
 	uint64_t txg = dmu_tx_get_txg(tx);
 	if (!md->md_synctask_txg[txg & TXG_MASK]) {
 		dsl_sync_task_nowait(dmu_tx_pool(tx),
-		    redaction_list_update_sync, md, 5, ZFS_SPACE_CHECK_NONE,
-		    tx);
+		    redaction_list_update_sync, md, tx);
 		md->md_synctask_txg[txg & TXG_MASK] = B_TRUE;
 		md->md_latest_synctask_txg = txg;
 	}
diff --git a/module/zfs/dsl_synctask.c b/module/zfs/dsl_synctask.c
index 2d6ca8549e..148e8fff24 100644
--- a/module/zfs/dsl_synctask.c
+++ b/module/zfs/dsl_synctask.c
@@ -170,15 +170,13 @@ dsl_sync_task_sig(const char *pool, dsl_checkfunc_t *checkfunc,
 
 static void
 dsl_sync_task_nowait_common(dsl_pool_t *dp, dsl_syncfunc_t *syncfunc, void *arg,
-    int blocks_modified, zfs_space_check_t space_check, dmu_tx_t *tx,
-    boolean_t early)
+    dmu_tx_t *tx, boolean_t early)
 {
 	dsl_sync_task_t *dst = kmem_zalloc(sizeof (*dst), KM_SLEEP);
 
 	dst->dst_pool = dp;
 	dst->dst_txg = dmu_tx_get_txg(tx);
-	dst->dst_space = blocks_modified << DST_AVG_BLKSHIFT;
-	dst->dst_space_check = space_check;
+	dst->dst_space_check = ZFS_SPACE_CHECK_NONE;
 	dst->dst_checkfunc = dsl_null_checkfunc;
 	dst->dst_syncfunc = syncfunc;
 	dst->dst_arg = arg;
@@ -192,18 +190,16 @@ dsl_sync_task_nowait_common(dsl_pool_t *dp, dsl_syncfunc_t *syncfunc, void *arg,
 
 void
 dsl_sync_task_nowait(dsl_pool_t *dp, dsl_syncfunc_t *syncfunc, void *arg,
-    int blocks_modified, zfs_space_check_t space_check, dmu_tx_t *tx)
+    dmu_tx_t *tx)
 {
-	dsl_sync_task_nowait_common(dp, syncfunc, arg,
-	    blocks_modified, space_check, tx, B_FALSE);
+	dsl_sync_task_nowait_common(dp, syncfunc, arg, tx, B_FALSE);
 }
 
 void
 dsl_early_sync_task_nowait(dsl_pool_t *dp, dsl_syncfunc_t *syncfunc, void *arg,
-    int blocks_modified, zfs_space_check_t space_check, dmu_tx_t *tx)
+    dmu_tx_t *tx)
 {
-	dsl_sync_task_nowait_common(dp, syncfunc, arg,
-	    blocks_modified, space_check, tx, B_TRUE);
+	dsl_sync_task_nowait_common(dp, syncfunc, arg, tx, B_TRUE);
 }
 
 /*
diff --git a/module/zfs/spa.c b/module/zfs/spa.c
index aac469f44b..31fa52d1d0 100644
--- a/module/zfs/spa.c
+++ b/module/zfs/spa.c
@@ -2688,8 +2688,7 @@ spa_livelist_condense_cb(void *arg, zthr_t *t)
 			lca->first_size = first_size;
 			lca->next_size = next_size;
 			dsl_sync_task_nowait(spa_get_dsl(spa),
-			    spa_livelist_condense_sync, lca, 0,
-			    ZFS_SPACE_CHECK_NONE, tx);
+			    spa_livelist_condense_sync, lca, tx);
 			dmu_tx_commit(tx);
 			return;
 		}
diff --git a/module/zfs/spa_history.c b/module/zfs/spa_history.c
index f47adb94d5..2ab5881540 100644
--- a/module/zfs/spa_history.c
+++ b/module/zfs/spa_history.c
@@ -397,8 +397,7 @@ spa_history_log_nvl(spa_t *spa, nvlist_t *nvl)
 	fnvlist_add_uint64(nvarg, ZPOOL_HIST_WHO, crgetruid(CRED()));
 
 	/* Kick this off asynchronously; errors are ignored. */
-	dsl_sync_task_nowait(spa_get_dsl(spa), spa_history_log_sync,
-	    nvarg, 0, ZFS_SPACE_CHECK_NONE, tx);
+	dsl_sync_task_nowait(spa_get_dsl(spa), spa_history_log_sync, nvarg, tx);
 	dmu_tx_commit(tx);
 
 	/* spa_history_log_sync will free nvl */
@@ -532,7 +531,7 @@ log_internal(nvlist_t *nvl, const char *operation, spa_t *spa,
 		spa_history_log_sync(nvl, tx);
 	} else {
 		dsl_sync_task_nowait(spa_get_dsl(spa),
-		    spa_history_log_sync, nvl, 0, ZFS_SPACE_CHECK_NONE, tx);
+		    spa_history_log_sync, nvl, tx);
 	}
 	/* spa_history_log_sync() will free nvl */
 }
diff --git a/module/zfs/vdev_indirect.c b/module/zfs/vdev_indirect.c
index 6bc2d917d5..5301e0665a 100644
--- a/module/zfs/vdev_indirect.c
+++ b/module/zfs/vdev_indirect.c
@@ -576,8 +576,7 @@ spa_condense_indirect_commit_entry(spa_t *spa,
 	 */
 	if (list_is_empty(&sci->sci_new_mapping_entries[txgoff])) {
 		dsl_sync_task_nowait(dmu_tx_pool(tx),
-		    spa_condense_indirect_commit_sync, sci,
-		    0, ZFS_SPACE_CHECK_NONE, tx);
+		    spa_condense_indirect_commit_sync, sci, tx);
 	}
 
 	vdev_indirect_mapping_entry_t *vime =
diff --git a/module/zfs/vdev_initialize.c b/module/zfs/vdev_initialize.c
index ab711441d9..7ff7fffcc8 100644
--- a/module/zfs/vdev_initialize.c
+++ b/module/zfs/vdev_initialize.c
@@ -126,7 +126,7 @@ vdev_initialize_change_state(vdev_t *vd, vdev_initializing_state_t new_state)
 	dmu_tx_t *tx = dmu_tx_create_dd(spa_get_dsl(spa)->dp_mos_dir);
 	VERIFY0(dmu_tx_assign(tx, TXG_WAIT));
 	dsl_sync_task_nowait(spa_get_dsl(spa), vdev_initialize_zap_update_sync,
-	    guid, 2, ZFS_SPACE_CHECK_NONE, tx);
+	    guid, tx);
 
 	switch (new_state) {
 	case VDEV_INITIALIZE_ACTIVE:
@@ -216,8 +216,7 @@ vdev_initialize_write(vdev_t *vd, uint64_t start, uint64_t size, abd_t *data)
 
 		/* This is the first write of this txg. */
 		dsl_sync_task_nowait(spa_get_dsl(spa),
-		    vdev_initialize_zap_update_sync, guid, 2,
-		    ZFS_SPACE_CHECK_RESERVED, tx);
+		    vdev_initialize_zap_update_sync, guid, tx);
 	}
 
 	/*
diff --git a/module/zfs/vdev_rebuild.c b/module/zfs/vdev_rebuild.c
index 85ed8afe1c..3362d608c0 100644
--- a/module/zfs/vdev_rebuild.c
+++ b/module/zfs/vdev_rebuild.c
@@ -267,7 +267,7 @@ vdev_rebuild_initiate(vdev_t *vd)
 	vd->vdev_rebuilding = B_TRUE;
 
 	dsl_sync_task_nowait(spa_get_dsl(spa), vdev_rebuild_initiate_sync,
-	    (void *)(uintptr_t)vd->vdev_id, 0, ZFS_SPACE_CHECK_NONE, tx);
+	    (void *)(uintptr_t)vd->vdev_id, tx);
 	dmu_tx_commit(tx);
 
 	vdev_rebuild_log_notify(spa, vd, ESC_ZFS_RESILVER_START);
@@ -553,8 +553,7 @@ vdev_rebuild_range(vdev_rebuild_t *vr, uint64_t start, uint64_t size)
 		vr->vr_scan_offset[txg & TXG_MASK] = start;
 		dsl_sync_task_nowait(spa_get_dsl(spa),
 		    vdev_rebuild_update_sync,
-		    (void *)(uintptr_t)vd->vdev_id, 2,
-		    ZFS_SPACE_CHECK_RESERVED, tx);
+		    (void *)(uintptr_t)vd->vdev_id, tx);
 	}
 
 	/* When exiting write out our progress. */
@@ -875,16 +874,14 @@ vdev_rebuild_thread(void *arg)
 		 * by a pool checkpoint.  See the dsl_scan_done() comments.
 		 */
 		dsl_sync_task_nowait(dp, vdev_rebuild_complete_sync,
-		    (void *)(uintptr_t)vd->vdev_id, 0,
-		    ZFS_SPACE_CHECK_NONE, tx);
+		    (void *)(uintptr_t)vd->vdev_id, tx);
 	} else if (vd->vdev_rebuild_cancel_wanted) {
 		/*
 		 * The rebuild operation was canceled.  This will occur when
 		 * a device participating in the rebuild is detached.
 		 */
 		dsl_sync_task_nowait(dp, vdev_rebuild_cancel_sync,
-		    (void *)(uintptr_t)vd->vdev_id, 0,
-		    ZFS_SPACE_CHECK_NONE, tx);
+		    (void *)(uintptr_t)vd->vdev_id, tx);
 	} else if (vd->vdev_rebuild_reset_wanted) {
 		/*
 		 * Reset the running rebuild without canceling and restarting
@@ -892,8 +889,7 @@ vdev_rebuild_thread(void *arg)
 		 * participate in the rebuild.
 		 */
 		dsl_sync_task_nowait(dp, vdev_rebuild_reset_sync,
-		    (void *)(uintptr_t)vd->vdev_id, 0,
-		    ZFS_SPACE_CHECK_NONE, tx);
+		    (void *)(uintptr_t)vd->vdev_id, tx);
 	} else {
 		/*
 		 * The rebuild operation should be suspended.  This may occur
diff --git a/module/zfs/vdev_removal.c b/module/zfs/vdev_removal.c
index 56e420871f..fdeca7ab34 100644
--- a/module/zfs/vdev_removal.c
+++ b/module/zfs/vdev_removal.c
@@ -1167,8 +1167,8 @@ vdev_remove_replace_with_indirect(vdev_t *vd, uint64_t txg)
 
 	/* After this, we can not use svr. */
 	tx = dmu_tx_create_assigned(spa->spa_dsl_pool, txg);
-	dsl_sync_task_nowait(spa->spa_dsl_pool, vdev_remove_complete_sync, svr,
-	    0, ZFS_SPACE_CHECK_NONE, tx);
+	dsl_sync_task_nowait(spa->spa_dsl_pool,
+	    vdev_remove_complete_sync, svr, tx);
 	dmu_tx_commit(tx);
 }
 
@@ -1317,7 +1317,7 @@ spa_vdev_copy_impl(vdev_t *vd, spa_vdev_removal_t *svr, vdev_copy_arg_t *vca,
 
 	if (svr->svr_max_offset_to_sync[txg & TXG_MASK] == 0) {
 		dsl_sync_task_nowait(dmu_tx_pool(tx), vdev_mapping_sync,
-		    svr, 0, ZFS_SPACE_CHECK_NONE, tx);
+		    svr, tx);
 	}
 
 	svr->svr_max_offset_to_sync[txg & TXG_MASK] = range_tree_max(segs);
@@ -2143,8 +2143,7 @@ spa_vdev_remove_top(vdev_t *vd, uint64_t *txg)
 	vdev_config_dirty(vd);
 	dmu_tx_t *tx = dmu_tx_create_assigned(spa->spa_dsl_pool, *txg);
 	dsl_sync_task_nowait(spa->spa_dsl_pool,
-	    vdev_remove_initiate_sync,
-	    (void *)(uintptr_t)vd->vdev_id, 0, ZFS_SPACE_CHECK_NONE, tx);
+	    vdev_remove_initiate_sync, (void *)(uintptr_t)vd->vdev_id, tx);
 	dmu_tx_commit(tx);
 
 	return (0);
diff --git a/module/zfs/vdev_trim.c b/module/zfs/vdev_trim.c
index 7383e14933..02b42ddd5a 100644
--- a/module/zfs/vdev_trim.c
+++ b/module/zfs/vdev_trim.c
@@ -317,7 +317,7 @@ vdev_trim_change_state(vdev_t *vd, vdev_trim_state_t new_state,
 	dmu_tx_t *tx = dmu_tx_create_dd(spa_get_dsl(spa)->dp_mos_dir);
 	VERIFY0(dmu_tx_assign(tx, TXG_WAIT));
 	dsl_sync_task_nowait(spa_get_dsl(spa), vdev_trim_zap_update_sync,
-	    guid, 2, ZFS_SPACE_CHECK_NONE, tx);
+	    guid, tx);
 
 	switch (new_state) {
 	case VDEV_TRIM_ACTIVE:
@@ -510,8 +510,7 @@ vdev_trim_range(trim_args_t *ta, uint64_t start, uint64_t size)
 
 		/* This is the first write of this txg. */
 		dsl_sync_task_nowait(spa_get_dsl(spa),
-		    vdev_trim_zap_update_sync, guid, 2,
-		    ZFS_SPACE_CHECK_RESERVED, tx);
+		    vdev_trim_zap_update_sync, guid, tx);
 	}
 
 	/*