From 11365e353eaa2f0ac18ffdb0bf556d1905075cd9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marek=20Marczykowski-G=C3=B3recki?=
 <marmarek@invisiblethingslab.com>
Date: Mon, 30 Mar 2015 04:54:37 +0200
Subject: [PATCH] udev: ignore temporary devices created during VM startup

(cherry picked from commit c731fa5b28580c0e97e293f9b5f3fe8aee15147e)
---
 udev/udev-block-add-change | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/udev/udev-block-add-change b/udev/udev-block-add-change
index fe90f29..a59356c 100755
--- a/udev/udev-block-add-change
+++ b/udev/udev-block-add-change
@@ -34,6 +34,13 @@ if [ "$MAJOR" -eq 7 -a ! -d /sys/$DEVPATH/loop ]; then
     xs_remove
     exit 0
 fi
+# ... and temporary device-mapper devices used during VM startup
+if [[ "$DM_NAME" = 'loop'* ] && \
+       [[ "`cat /sys/block/${DM_NAME%p*}/loop/backing_file`" = \
+            '/var/lib/qubes/'*'/volatile.img' ]]; then
+    xs_remove
+    exit 0
+fi
 
 # Check if device is read-only
 if [ "`cat /sys/$DEVPATH/ro`" -eq 1 ]; then