>> We (=NetBSD) may decide we don't care about supporting any such
>> filesystems, but [...]
> And where in this have we said we want to preclude this?

I don't think that's ever been said (in this thread).

> I feel your concern is mis-placed.  Nothing in this thread will
> preclude what you're describing.

Oh, good.  I must have misunderstood something, then; I thought someone
suggested collapsing all the layers' vnodes into one vnode, which it
seemed to me would make it rather difficult to have a single
upper-layer vnode map into multiple lower-layer vnodes.  If there is no
such obstacle, then yes, my concern is not applicable.

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