Add File Server Role to Existing Hyper-V Cluster - Storage Query

Hi,

I have a W2012R2 Hyper-V cluster. Two nodes, 3 CSVs (one for each node and one quorum).

I'd now like to add the File Server role to the Cluster. I have no new storage to assign to this additional role so I'd like to simply utilise one of the existing CSVs. Is this possible, or does will the File Server cluster role require its own exclusive storage?

Thanks.