Update 'etc-init.d-swapfile'

etc-init.d-swapfile

@@ -8,7 +8,8 @@ EXTRA_COMMANDS="status create"
 EXTRA_HELP="	status 	Check service status
 	create 	Create a swapfile"
 
-SWPATH="/mnt/routerdata/swapfile"
+# default value, it'd be better to use other place than overlay
+SWPATH="/overlay/swapfile"
 
 boot() {
 	if [ -f $SWPATH ]; then
@@ -56,7 +57,11 @@ stop() {
 create() {
 	RAMTOTAL=`fgrep MemTotal /proc/meminfo | awk '{print $2}'`
 	SWAPTOTAL=`fgrep SwapTotal /proc/meminfo | awk '{print $2}'`
-	if [ $SWAPTOTAL != 0 ]; then                      
+	OVERLAYSIZE=`df | grep overlayfs | awk '{print $3}'`
+	if [ $OVERLAYSIZE < $RAMTOTAL ]; then
+		echo "ERROR: Not enough storage for a swapfile, quitting..."
+		exit 1
+	elif [ $SWAPTOTAL != 0 ]; then                      
 		echo "ERROR: Swap already in use, quitting..."
 	else
 		dd if=/dev/zero of=$SWFILE bs=1024 count=$RAMTOTAL