Partially revert eee9362

With commit 34ce4c4 applied, there is no need for eee9362.
Revert that aside from the test. All tests introduced in those commits
pass.

Signed-off-by: George Amanakis <gamanakis@gmail.com>

module/zfs/dmu_objset.c

@@ -2408,6 +2408,13 @@ dmu_objset_id_quota_upgrade_cb(objset_t *os)
 	    dmu_objset_userobjspace_present(os))
 		return (SET_ERROR(ENOTSUP));
 
+	if (dmu_objset_userobjused_enabled(os))
+		dmu_objset_ds(os)->ds_feature_activation[
+		    SPA_FEATURE_USEROBJ_ACCOUNTING] = (void *)B_TRUE;
+	if (dmu_objset_projectquota_enabled(os))
+		dmu_objset_ds(os)->ds_feature_activation[
+		    SPA_FEATURE_PROJECT_QUOTA] = (void *)B_TRUE;
+
 	err = dmu_objset_space_upgrade(os);
 	if (err)
 		return (err);

module/zfs/dsl_dataset.c

@@ -1759,25 +1759,6 @@ dsl_dataset_snapshot_sync_impl(dsl_dataset_t *ds, const char *snapname,
 		}
 	}
 
-	/*
-	 * We are not allowed to dirty a filesystem when done receiving
-	 * a snapshot. In this case some flags such as SPA_FEATURE_LARGE_BLOCKS
-	 * will not be set and a subsequent encrypted raw send will fail. Hence
-	 * activate this feature if needed here. This needs to happen only in
-	 * syncing context.
-	 */
-	if (dmu_tx_is_syncing(tx)) {
-		for (spa_feature_t f = 0; f < SPA_FEATURES; f++) {
-			if (zfeature_active(f, ds->ds_feature_activation[f]) &&
-			    !(zfeature_active(f, ds->ds_feature[f]))) {
-				dsl_dataset_activate_feature(dsobj, f,
-				    ds->ds_feature_activation[f], tx);
-				ds->ds_feature[f] =
-				    ds->ds_feature_activation[f];
-			}
-		}
-	}
-
 	ASSERT3U(ds->ds_prev != 0, ==,
 	    dsl_dataset_phys(ds)->ds_prev_snap_obj != 0);
 	if (ds->ds_prev) {

module/zfs/dsl_scan.c

@@ -2058,11 +2058,6 @@ dsl_scan_visitbp(blkptr_t *bp, const zbookmark_phys_t *zb,
 		return;
 	}
 
-	if (bp->blk_birth <= scn->scn_phys.scn_cur_min_txg) {
-		scn->scn_lt_min_this_txg++;
-		return;
-	}
-
 	bp_toread = kmem_alloc(sizeof (blkptr_t), KM_SLEEP);
 	*bp_toread = *bp;