> Not even getting into per-user namespaces, it would be nice to be able
> to make parts of a filesystem appear in different places.
As soon as you have done that you will have no problems with full
namespaces. It's *not* easier (i.e. has the same problems).
> Think about that. When you do a normal umount, you are really doing two
> operations at once. The filesystem is first disconnected from the namespace,
> then it is shut down (blocks written, marked clean, etc.). The opposite
> happens at mount time. If these operations are made independent, then
> admins could make a filesystem appear in 0, 1, or many places while it is
> in a running state.
Yes, it makes sense. Except that you'll have to be very accurate with
knfsd - it will be more than happy to break apart. And you'll have to be
accurate with .. from filesystem root.
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