DMU_OT_DSL_DIR
ASSERT3U(doi.doi_bonus_type, ==, DMU_OT_DSL_DIR);
dmu_object_zapify(mos, dd->dd_object, DMU_OT_DSL_DIR, tx);
ddobj = dmu_object_alloc(mos, DMU_OT_DSL_DIR, 0,
DMU_OT_DSL_DIR, sizeof (dsl_dir_phys_t), tx);