ramdisk: Make usage of ramdisk configurable

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

lfs/initscripts

@@ -61,8 +61,8 @@ $(TARGET) :
 	-rm -rf /etc/init.d
 	ln -svf rc.d/init.d /etc/init.d
 
-	#create ramdiskfile to force ramdiskcreation if FORCE=1
+	# Create default ramdisk configuration
-	echo "FORCE=0" > /etc/sysconfig/ramdisk
+	echo "RAMDISK_MODE=0" > /etc/sysconfig/ramdisk
 
 	for i in $(DIR_SRC)/src/initscripts/init.d/*; do \
 		install -v -m 754 $$i /etc/rc.d/init.d/; \

src/initscripts/init.d/collectd

@@ -1,12 +1,10 @@
 #!/bin/sh
 # Begin $rc_base/init.d/collecd
 
-
 . /etc/sysconfig/rc
 . $rc_functions
 
 eval $(/usr/local/bin/readhash /var/ipfire/main/settings)
-eval $(/usr/local/bin/readhash /etc/sysconfig/ramdisk)
 
 if [ "$RRDLOG" = '' ]; then
 	RRDLOG=/var/log/rrd
@@ -14,7 +12,7 @@ fi
 
 case "$1" in
 	start)
-		if [ "$FORCE" == '1' ] || [ "$(mem_amount)" -gt "490" ];then
+		if use_ramdisk; then
 			#mount ramdisk
 			if ! mountpoint $RRDLOG &>/dev/null; then
 				boot_mesg "Mount rrd Ramdisk..."

src/initscripts/init.d/functions

@@ -709,6 +709,39 @@ mem_amount() {
         echo "$(( ${pagesize} * ${pages} / 1024 / 1024 ))"
 }
 
+use_ramdisk() {
+	eval $(/usr/local/bin/readhash /etc/sysconfig/ramdisk)
+
+	case "${RAMDISK_MODE}" in
+		# Don't use ramdisk
+		0)
+			return 1
+			;;
+
+		# Always use ramdisk
+		1)
+			return 0
+			;;
+
+		# Automatic mode - use ramdisk if sufficient
+		# memory is available
+		2)
+			local mem_avail="$(mem_amount)"
+
+			if [ ${mem_avail} -ge 490 ]; then
+				return 0
+			else
+				return 1
+			fi
+			;;
+
+		# Fail for everything else
+		*)
+			return 2
+			;;
+	esac
+}
+
 mount_ramdisk() {
 	mount -t tmpfs none $1
 }

src/initscripts/init.d/vnstat

@@ -12,7 +12,7 @@ fi
 
 case "$1" in
 	start)
-		if [ "$FORCE" == '1' ] || [ "$(mem_amount)" -gt "490" ];then
+		if use_ramdisk; then
 			if ! mountpoint $VNSTATLOG &>/dev/null; then
 				boot_mesg "Mount vnstat ramdisk..."
 				if [ $(find "$VNSTATLOG" | wc -l) -ne 1 ]; then