Speed up LVM-activation

Change vgscan and vgchange so they are done in one go.
Faster since less work for the lvm command.
vgscan is still needed for some cases like dmcrypt where
/etc/lvm/cache is created, but not updated with the unlocked devices.

defaults/initrd.scripts

@@ -632,17 +632,22 @@ startVolumes() {
 
 	if [ "${USE_LVM_NORMAL}" = '1' ]
 	then
-		if [ -e '/bin/vgscan' -a -e '/bin/vgchange' ]
+		if [ -e '/bin/lvm' ]
 		then
 			for dev in ${RAID_DEVICES}
 			do
 				setup_md_device "${dev}"
 			done
 
-			good_msg "Scanning for Volume Groups"
-			/bin/vgscan --ignorelockingfailure --mknodes 2>/dev/null
-			good_msg "Activating Volume Groups"
-			/bin/vgchange -ay --sysinit 2>/dev/null
+			# This is needed for /bin/lvm to accept the following logic
+			lvm_commands="#! /bin/lvm"
+			# If there is a cahe, update it. Unbreak at least dmcrypt
+			[ -d /etc/lvm/cache ] && lvm_commands="$lvm_commands \nvgscan"
+			# To activate volumegroups on all devices in the cache
+			lvm_commands="$lvm_commands \nvgchange -ay --sysinit"
+			# And finally execute it all (/proc/... needed if lvm is compiled without readline)
+			good_msg "Scanning for and activating Volume Groups"
+			printf "%b\n" "$lvm_commands" | /bin/lvm /proc/self/fd/0
 
 			# Disable EVMS since lvm is activated and they dont work together.
 			if [ "${USE_EVMS_NORMAL}" = '1' ]

defaults/linuxrc

@@ -31,12 +31,6 @@ then
 	[ -e /linuxrc ] && rm /linuxrc
 fi
 
-if [ -e /bin/lvm ]
-then
-	[ -e /bin/vgscan   ] || ln -s /bin/lvm /bin/vgscan
-	[ -e /bin/vgchange ] || ln -s /bin/lvm /bin/vgchange
-fi
-
 quiet_kmsg
 
 CMDLINE=`cat /proc/cmdline`