-+ DM_REAL_DEVICE="$(readlink -f "$GRUB_DEVICE")"
-+ DM_UUID="$(cat /sys/block/${DM_REAL_DEVICE#/dev/}/dm/uuid)"
-+ case "$DM_UUID" in
-+ LVM-*)
-+ # change "--" to / (as "/" is impossible in LV name)
-+ local dev=$(awk -vdev="${GRUB_DEVICE#/dev/mapper/}" 'BEGIN{gsub(/--/, "/", dev); print dev}')
-+ local VG=$(awk -vdev="$dev" 'BEGIN{split(dev, v, "-"); gsub("/", "-", v[1]); print v[1]}')
-+ local LV=$(awk -vdev="$dev" 'BEGIN{split(dev, v, "-"); gsub("/", "-", v[2]); print v[2]}')
-+ GRUB_DEVICE=/dev/$VG/$LV
-+ ;;
-+ esac
++ LVM2_LV_NAME='' LVM2_VG_NAME=''
++ eval $(lvs --noheadings --nameprefixes "$GRUB_DEVICE" 2>/dev/null)
++ if [ -n "$LVM2_VG_NAME$LVM2_LV_NAME" ]; then
++ GRUB_DEVICE=/dev/$LVM2_VG_NAME/$LVM2_LV_NAME
++ fi