> If we end up removing the module, we'll call "unregister_blockdev()" or
> whatever, which in turn gets rid of _all_ pages, and that that time we
> will correctly get rid of buffers.
>
> And before you remove the module I see no advantage to have any guarantees
> of quiescence and removing the buffer heads. I only see extra code that
> doesn't seem to have any real purpose..
As it is, driver has a right to destroy any internal data structures as
soon as the last ->release() is called. None of them expect requests
coming in after that and frankly, that makes sense.
IOW, if there is any point in _having_ ->release() at all, we'd better
make sure that nothing will bother the driver between the final ->release()
and the next ->open().
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