growroot()
{
  echo "[] linux-rootfs-resize ..."
  root_part=$(echo ${root} |sed "s/block://")
  root_dev=$(echo ${root_part}| sed "s/[^a-z]//g" | sed "s/^dev//g")
  part_num=$(echo ${root_part}| sed "s/[^0-9]//g")
  echo "part=${root_part} dev=${root_dev} num=${part_num}"
  growpart -v /dev/${root_dev} ${part_num}
  partprobe -s /dev/${root_dev}
  e2fsck -p -f /dev/${root_dev}${part_num}
  resize2fs -p /dev/${root_dev}${part_num}
}