DMU_POOL_DIRECTORY_OBJECT
DMU_POOL_DIRECTORY_OBJECT, &dir))
if (objset_get_dnode(spa, spa->spa_mos, DMU_POOL_DIRECTORY_OBJECT, &dir)) {
DMU_POOL_DIRECTORY_OBJECT, &dir)) {
objdir = objset_dnode_lookup(zfs->mos, DMU_POOL_DIRECTORY_OBJECT);
assert(dnid == DMU_POOL_DIRECTORY_OBJECT);