mod_dav question

Hello list,

We are using mod_dav with apache2.4 to manage files via webdav protocol.
We want to limit file uploading based on the user's total storage.
For instance, if a user has his storage size reached to the max limit, he
can't upload files anymore.
Do you have any suggestions on how I can implement this by modperl?

Thanks in advance.
Yamada