The more I'm thinking about this, why don't we simply have these (the
various possible vdsos as well as vvar) as actual files in sysfs instead
of introducing a new filesystem? I don't believe sysfs actually has to
be mounted in order for sysfs files to have an inode.
It could also be in procfs, I guess, but sysfs probably makes more sense.
I'm thinking something like:
Not only would this let the container people and so on do weird things
much easier, but it ought to eliminate a whole slew of special cases.