Re: [RFC 00/11] DAX fsynx/msync support

Jeff Moyer [off-list ref] writes:

quoted

Hence once the filesystem has waited on the REQ_WRITE|REQ_FLUSH IO
to complete, we know that all the earlier REQ_WRITE IOs are on
stable storage, too. Hence there's no need for the elevator to drain
the queue to guarantee completion ordering - the dispatch ordering
and flush/fua write semantics guarantee that when the flush/fua
completes, all the IOs dispatch prior to that flush/fua write are
also on stable storage...

Des xfs rely on this model for correctness?  If so, I'd say we've got a
problem.

Dave?

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