[dev] Rationel behind VFS

[Jeroen Huinink]

While I was doing some stuff on Gollem I noticed that the VFS behaves
differently for different backends. I assumed that the VFS would behave the
same for all backends and that that was the entire purpose behind the VFS.
Was this assumption wrong or is the VFS work in progress and should
differences be removed between different backends as much as possible. Could
somebody elaborate?

Regards,
Jeroen