From 03adce7ea2b92a0650652fe9f12279207459a860 Mon Sep 17 00:00:00 2001
Message-Id: <03adce7ea2b92a0650652fe9f12279207459a860@dist-git>
From: Peter Krempa <pkrempa@redhat.com>
Date: Fri, 26 Sep 2014 09:47:01 +0200
Subject: [PATCH] qemu: Always re-detect backing chain

Since 363e9a68 we track backing chain metadata when creating snapshots
the right way even for the inactive configuration. As we did not yet
update other code paths that modify the backing chain (blockpull) the
newDef backing chain gets out of sync.

After stopping of a VM the new definition gets copied to the next start
one. The new VM then has incorrect backing chain info. This patch
switches the backing chain detector to always purge the existing backing
chain and forces re-detection to avoid this issue until we'll have full
backing chain tracking support.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1144922
(cherry picked from commit fe7ef7b112b3b4d6f9c9edf499a79683fb0b7edb)

Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
---
 src/qemu/qemu_domain.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index ac70f62..72d7279 100644
--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@@ -2544,7 +2544,7 @@ qemuDomainCheckDiskPresence(virQEMUDriverPtr driver,
             virFileExists(path))
             continue;
 
-        if (qemuDomainDetermineDiskChain(driver, vm, disk, false, true) >= 0)
+        if (qemuDomainDetermineDiskChain(driver, vm, disk, true, true) >= 0)
             continue;
 
         if (disk->startupPolicy &&
-- 
2.1.1