Re: [PATCH 4/4] backup: Allow configuring incremental backup per-disk individually

The semantics of the backup operation don't strictly require that all disks being backed up are part of the same incremental part (when a disk was checkpointed/backed up separately or in a different VM), or even they may not have an previous checkpoint at all (e.g. when the disk

was freshly hotplugged to the vm). In such cases we can still create a common checkpoint for all of them and backup differences according to configuration. This patch adds a per-disk configuration of the checkpoint to do the incremental backup from via the 'incremental' attribute and allows perform full backups via the 'backupmode' attribute. Note that no changes to the qemu driver are necessary to take advantage of this as we already obey the per-disk 'incremental' field. https://bugzilla.redhat.com/show_bug.cgi?id=1829829 Signed-off-by: Peter Krempa <pkrempa(a)redhat.com&gt; --- v2: - backupmode=full incremental="..." is now rejected by the RNG schema - test output changes as we now validate virDomainBackupAlignDisks - typo fix