When the block copy operation is started with a reused external file in
incremental mode libvirt will need to open and insert the backing chain
for that file into qemu (in -blockdev mode). This means that we'll need
to track the backing chain and metadata such as node names for the full
chain of <mirror>.
This patch invokes the full backing chain formatter and parser for
<mirror> so that the chain can be kept with <mirror>.
Signed-off-by: Peter Krempa <pkrempa@xxxxxxxxxx>
---
docs/schemas/domaincommon.rng | 1 +
src/conf/domain_conf.c | 5 +++++
tests/qemustatusxml2xmldata/blockjob-mirror-in.xml | 13 +++++++++++++
tests/qemuxml2argvdata/disk-mirror.xml | 6 ++++++
tests/qemuxml2xmloutdata/disk-mirror-active.xml | 6 ++++++
5 files changed, 31 insertions(+)
diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index 1828e0795b..623ef28719 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -5676,6 +5676,7 @@
</choice>
</attribute>
</optional>
+ <ref name="diskBackingChain"/>
</element>
</define>
<define name="diskAuth">
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 2514c60744..0970d48045 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -9351,6 +9351,8 @@ virDomainDiskDefMirrorParse(virDomainDiskDefPtr def,
if (mirrorType) {
if (virDomainStorageSourceParse(NULL, ctxt, def->mirror, flags, xmlopt) < 0)
return -1;
+ if (virDomainDiskBackingStoreParse(ctxt, def->mirror, flags, xmlopt) < 0)
+ return -1;
} else {
/* For back-compat reasons, we handle a file name encoded as
* attributes, even though we prefer modern output in the style of
@@ -24033,6 +24035,9 @@ virDomainDiskDefFormatMirror(virBufferPtr buf,
if (virDomainDiskSourceFormat(&childBuf, disk->mirror, 0, false, flags, xmlopt) < 0)
return -1;
+ if (virDomainDiskBackingStoreFormat(&childBuf, disk->mirror, xmlopt, flags) < 0)
+ return -1;
+
if (virXMLFormatElement(buf, "mirror", &attrBuf, &childBuf) < 0)
return -1;
diff --git a/tests/qemustatusxml2xmldata/blockjob-mirror-in.xml b/tests/qemustatusxml2xmldata/blockjob-mirror-in.xml
index 32bde1ba66..df23ac00aa 100644
--- a/tests/qemustatusxml2xmldata/blockjob-mirror-in.xml
+++ b/tests/qemustatusxml2xmldata/blockjob-mirror-in.xml
@@ -65,6 +65,7 @@
<mirror type='file' file='/tmp/copy.img' format='qcow2' job='copy'>
<format type='qcow2'/>
<source file='/tmp/copy.img'/>
+ <backingStore/>
</mirror>
<target dev='vda' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
@@ -76,6 +77,18 @@
<mirror type='file' file='/tmp/logcopy.img' format='qcow2' job='copy' ready='abort'>
<format type='qcow2'/>
<source file='/tmp/logcopy.img'/>
+ <backingStore type='block' index='1'>
+ <format type='raw'/>
+ <source dev='/dev/HostVG/backing'>
+ <privateData>
+ <nodenames>
+ <nodename type='storage' name='test-backing-storage'/>
+ <nodename type='format' name='test-backing-format'/>
+ </nodenames>
+ </privateData>
+ </source>
+ <backingStore/>
+ </backingStore>
</mirror>
<target dev='vdb' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
diff --git a/tests/qemuxml2argvdata/disk-mirror.xml b/tests/qemuxml2argvdata/disk-mirror.xml
index e89eee47ed..c1e6e94e33 100644
--- a/tests/qemuxml2argvdata/disk-mirror.xml
+++ b/tests/qemuxml2argvdata/disk-mirror.xml
@@ -36,6 +36,7 @@
<mirror type='file' file='/tmp/copy.img' format='qcow2' job='copy'>
<format type='qcow2'/>
<source file='/tmp/copy.img'/>
+ <backingStore/>
</mirror>
<target dev='vda' bus='virtio'/>
</disk>
@@ -45,6 +46,11 @@
<mirror type='file' file='/tmp/logcopy.img' format='qcow2' job='copy' ready='abort'>
<format type='qcow2'/>
<source file='/tmp/logcopy.img'/>
+ <backingStore type='block' index='1'>
+ <format type='raw'/>
+ <source dev='/dev/HostVG/backing'/>
+ <backingStore/>
+ </backingStore>
</mirror>
<target dev='vdb' bus='virtio'/>
</disk>
diff --git a/tests/qemuxml2xmloutdata/disk-mirror-active.xml b/tests/qemuxml2xmloutdata/disk-mirror-active.xml
index d689eac6b8..32ffc647be 100644
--- a/tests/qemuxml2xmloutdata/disk-mirror-active.xml
+++ b/tests/qemuxml2xmloutdata/disk-mirror-active.xml
@@ -40,6 +40,7 @@
<mirror type='file' file='/tmp/copy.img' format='qcow2' job='copy'>
<format type='qcow2'/>
<source file='/tmp/copy.img'/>
+ <backingStore/>
</mirror>
<target dev='vda' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
@@ -51,6 +52,11 @@
<mirror type='file' file='/tmp/logcopy.img' format='qcow2' job='copy' ready='abort'>
<format type='qcow2'/>
<source file='/tmp/logcopy.img'/>
+ <backingStore type='block' index='1'>
+ <format type='raw'/>
+ <source dev='/dev/HostVG/backing'/>
+ <backingStore/>
+ </backingStore>
</mirror>
<target dev='vdb' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
--
2.20.1
--
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