>> Actually, it occurs to me: the logical way for this to work is
>> 	mount -t devfs /etc/devfs.db /dev
> Keep in mind that /dev is not solely the .db file; it is the core
> devices MODIFIED by the .db file (i.e. a union).

Yes, that would be implicit in -t devfs.  Whether this actually uses
(the equivalent of) -o union is an implementation decision.

> - chown(2) and chmod(2) are VFS-safe, right?  i.e. they behave
>    differently on different fstypes...?

Yes, they turn into VOP_SETATTR, I think it is.

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