File libvirt-Fix-probing-of-QED-file-format.patch of Package libvirt

From 55276493d15d227cb378b92f922ef3adf84da6d6 Mon Sep 17 00:00:00 2001
Message-Id: <55276493d15d227cb378b92f922ef3adf84da6d6.1373271637.git.jdenemar@redhat.com>
From: "Daniel P. Berrange" <berrange@redhat.com>
Date: Mon, 25 Feb 2013 16:21:46 -0700
Subject: [PATCH] Fix probing of QED file format

https://bugzilla.redhat.com/show_bug.cgi?id=903248

The QED file format is non-versioned, so although the magic
value matched, libvirt rejected it due to lack of a version
number to compare against. We need to distinguish this case
by allowing a value of '-2' to indicate a non-versioned file
where only the magic is required to match

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
(cherry picked from commit 32bef82a2d061fc131ab26c6d8ee09705ccab5c4)
---
 src/util/storage_file.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/util/storage_file.c b/src/util/storage_file.c
index 24ef3ea..f354693 100644
--- a/src/util/storage_file.c
+++ b/src/util/storage_file.c
@@ -174,8 +174,8 @@ static struct FileTypeInfo const fileTypeInfo[] = {
     },
     [VIR_STORAGE_FILE_QED] = {
         /* http://wiki.qemu.org/Features/QED */
-        "QED\0", NULL,
-        LV_LITTLE_ENDIAN, -1, -1,
+        "QED", NULL,
+        LV_LITTLE_ENDIAN, -2, -1,
         QED_HDR_IMAGE_SIZE, 8, 1, -1, qedGetBackingStore,
     },
     [VIR_STORAGE_FILE_VMDK] = {
@@ -612,6 +612,10 @@ virStorageFileMatchesVersion(int format,
     if (fileTypeInfo[format].versionOffset == -1)
         return false;
 
+    /* -2 == non-versioned file format, so trivially match */
+    if (fileTypeInfo[format].versionOffset == -2)
+        return true;
+
     if ((fileTypeInfo[format].versionOffset + 4) > buflen)
         return false;
 
-- 
1.8.2.1