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qemu: backup: Configure backup store image with backing file

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In contrast to snapshots the backup job does not complain when the
backup job's store file has backing pre-configured. It's actually
required so that the NBD server exposes all the data properly.

Remove our fake termination and use the existing disk source as backing.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
This commit is contained in:
Peter Krempa 2019-12-20 09:33:40 +01:00
parent 728b993c8a
commit d6b994bafd
1 changed files with 2 additions and 6 deletions
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8
src/qemu/qemu_backup.c
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@ -302,7 +302,6 @@ qemuBackupDiskPrepareDataOne(virDomainObjPtr vm,
bool removeStore)
{
qemuDomainObjPrivatePtr priv = vm->privateData;
g_autoptr(virStorageSource) terminator = NULL;
/* set data structure */
dd->backupdisk = backupdisk;
@ -331,17 +330,14 @@ qemuBackupDiskPrepareDataOne(virDomainObjPtr vm,
return -1;
}
/* install terminator to prevent qemu form opening backing images */
if (!(terminator = virStorageSourceNew()))
return -1;
if (!(dd->blockjob = qemuBlockJobDiskNewBackup(vm, dd->domdisk, dd->store,
removeStore,
dd->incrementalBitmap)))
return -1;
/* use original disk as backing to prevent opening the backing chain */
if (!(dd->crdata = qemuBuildStorageSourceChainAttachPrepareBlockdevTop(dd->store,
terminator,
dd->domdisk->src,
priv->qemuCaps)))
return -1;