if [ -f "/sbin/dmsetup" ]
then
	# get a list of all dm-mappings on top of loop devices. Based on
	# the  assumption that loop devices always use major number 7
	for i in `/sbin/dmsetup deps | grep '(7,' | awk '{print substr($1,1,length($1)-1)}'`
	do
		# get minor number of loop device
		LN=`/sbin/dmsetup deps ${i} | awk '{print substr($5,1,length($5)-1)}'`
		umount /dev/mapper/${i} &>/dev/null; true
		/sbin/dmsetup remove ${i}
		/sbin/losetup -d /dev/loop${LN}
		unset LN
	done
fi