On Wed 10 Jun 2020 09:43:53 PM CEST, Eric Blake wrote: > On 6/10/20 10:03 AM, Alberto Garcia wrote: >> This function is only used by qcow2_expand_zero_clusters() to >> downgrade a qcow2 image to a previous version. It is however not >> possible to downgrade an image with extended L2 entries because older >> versions of qcow2 do not have this feature. > > Well, it _is_ possible, but it would involve rewriting the entire > L1/L2 tables (including all internal snapshots)
Right :-) Let's try this way: This function is only used by qcow2_expand_zero_clusters() to downgrade a qcow2 image to a previous version. This would require transforming all extended L2 entries into normal L2 entries but this is not a simple task and there are no plans to implement this at the moment. Berto