It's simple if it's synchronous. When I discussed this a while
back with the LVM and EVMS developers the consensus was that an
async API would be better - so we'd need some sort of completion
cookie or callback or whatever.
It would end up with almost as much state as the rather amazing
`struct dio'.
Of course, one could do a synchronous API and see if anyone really,
really complains ;) But a bit of requirements-gathering would be
needed before getting in and coding it.
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