Comment 4 for bug 1996188

Cool, on nova and cinder for qcow2. Glance would need to check that during/before the image format conversion, because the code you linked there would happen after we've already converted it to raw, I think. I don't see such a check here:

https://opendev.org/openstack/glance/src/branch/master/glance/async_/flows/plugins/image_conversion.py

That is an optional plugin, requires being enabled, and only impacts images being imported (not uploaded). So, a much smaller surface.