ZFS_ONLINE_EXPAND
flags |= ZFS_ONLINE_EXPAND;
error = vdev_online(spa, guid, ZFS_ONLINE_EXPAND, &newstate);
if (flags & ZFS_ONLINE_EXPAND) {
if ((flags & ZFS_ONLINE_EXPAND ||
pvd->vdev_expanding = !!(flags & ZFS_ONLINE_EXPAND);
if ((flags & ZFS_ONLINE_EXPAND) || spa->spa_autoexpand) {