I'm trying to find out which qcow2 options could be inherited to snapshot/blockcopy and then test them. 

From https://github.com/qemu/qemu/blob/master/qapi/block-core.json#L4720 we can know all the qcow2 options. As far as I know, size, cluster_size and extended-l2 have already been implemented. So I'm curious that:

1) What are the current status and future plans of other options? Like compat option. 

2) Also whether the vol-clone can cover all options?

Thank you very much. And please help to correct me if I have something wrong.