#!/bin/sh
# Check if disk has been used since last check and spin it down if not

if [ "${1}" == "" ]; then
	echo "Usage: $(basename ${0}) <device file>"
	exit
fi

last_state_file="/tmp/storage-state-${1}"

touch $last_state_file
chmod 600 $last_state_file

new_storage_state=$(cat /proc/diskstats | grep "$1")
old_storage_state=$(cat $last_state_file)

if [ "$new_storage_state" = "$old_storage_state" ]; then
	sync
	sdparm --flexible --readonly --command=stop /dev/$1 2>&1 > /dev/null
fi

echo "$new_storage_state" > $last_state_file