provisioning clients in teuthology with an extra local filesystem

I've been working on a patch series to overhaul the fscache code in the kclient. I also have this (really old) tracker to add fscache testing to teuthology: https://tracker.ceph.com/issues/6373 It would be ideal if the clients in such testing had a dedicated filesystem mounted on /var/cache/fscache, so that if it fills up it doesn't take down the rootfs with it. We'll also need to have cachefilesd installed and running in the client hosts. Is it possible to do this in teuthology? How would I approach this? Thanks, -- Jeff Layton <jlayton(a)redhat.com>