vfs/vnode/file overhaul

["Simon 'corecode' Schubert" <corecode@xxxxxxxxxxxx>]

Hey,

as a 1.11 topic I think we should change the vnode/file interface to make more sense.  these are of course just stupid ideas to illustrate what I am thinking of:

- all per-fdesc-I/O runs through a struct file and not directly to a vnode
- vnodes only represent logical entities (on disk), NOT devices or whatnot.
- thus drop specfs, this always seemed switched in at the wrong place in the stack
- this will allow us to do device cloning
- a slim vnode interface makes it easier to do support a...
- userland vfs interface which can support something like the kernel API, so userland drivers have a chance to be easily ported to the kernel.

do I make sense?  feedback expected!

cheers
 simon

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