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由 Peter Krempa 提交于
Historically we've only supported the <backingStore> as an output-only element for domain disks. The documentation states that it may become supported on input. To allow management apps detectin once that happens add a domain capability which will be asserted if the hypervisor driver will be able to obey the <backingStore> as configured on input. Signed-off-by: NPeter Krempa <pkrempa@redhat.com> Reviewed-by: NDaniel P. Berrangé <berrange@redhat.com>
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