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--reflink only works with raw images, since copying anything else will hit the qemu-img code path in libvirt storage driver. This can pop up more nowadays since UEFI support is using qcow2 as well. Let's only attempt --reflink for raw disk images. It's basically an optimization anyways https://bugzilla.redhat.com/show_bug.cgi?id=2256285 Signed-off-by: Cole Robinson <crobinso@redhat.com>