From 3b10c5633301f199dda19f1d90135e3c0e9468e5 Mon Sep 17 00:00:00 2001
From: Jonathan Bauer
Date: Tue, 19 Nov 2019 14:35:04 +0100
Subject: fix math

---
 builder/modules.d/slx-dmsetup/scripts/dmsetup-slx-device | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/builder/modules.d/slx-dmsetup/scripts/dmsetup-slx-device b/builder/modules.d/slx-dmsetup/scripts/dmsetup-slx-device
index ac1d5234..d65c0dbb 100755
--- a/builder/modules.d/slx-dmsetup/scripts/dmsetup-slx-device
+++ b/builder/modules.d/slx-dmsetup/scripts/dmsetup-slx-device
@@ -147,12 +147,12 @@ ramdisk_fallback() {
 	local ram_size_in_kb="$(awk '/MemTotal/ {printf("%d\n", $2 )}' /proc/meminfo)"
 	modprobe dm-zero
 	# fill the qcow2 device with a zero device to make it larger than it is
-	dmsetup_create_noudevsync filler "0 $(( ram_size_in_kb / 2 )) zero"
-	echo "0 $(( read_only_device_size / 2 )) linear $read_only_device 0
-	0 $(( ram_size_in_kb / 2 )) linear /dev/mapper/filler 0" | dmsetup create bigger --noudevsync
+	dmsetup_create_noudevsync filler "0 $ram_size_in_kb zero"
+	echo "0 $read_only_device_size linear $read_only_device 0
+	$read_only_device_size $ram_size_in_kb linear /dev/mapper/filler 0" | dmsetup create bigger --noudevsync
 	dmsetup mknodes --noudevsync bigger
 
-	# Use the qcow size + half the RAM as tmpfs size.
+	# Use the qcow size + ***************half************* the RAM as tmpfs size.
 	local cow_size="$(( qcow_size_in_kb + ( ram_size_in_kb / 2 ) ))"
 	if ! mount -t tmpfs tmpfs -o size="${cow_size}k" "$cow_tmpfs"; then
 		emergency_shell "Failed to prepare dedicated CoW tmpfs in $cow_tmpfs of size $cow_size."
@@ -164,7 +164,7 @@ ramdisk_fallback() {
 	fi
 	writable_device="$(losetup --show --find "$file")"
 	read_only_device=/dev/mapper/bigger
-	read_only_device_size="$cow_size"
+	read_only_device_size="$(( read_only_device_size + ram_size_in_kb ))"
 	cow_device_candidate="root"
 	while [ -b "/dev/mapper/$cow_device_candidate" ]; do
 		cow_device_candidate="root.$RANDOM"
-- 
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