Re: Orangefs ABI documentation

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On Wed, Feb 10, 2016 at 10:22:40PM -0500, Mike Marshall wrote:
> > If there is (or at least supposed to be) something that prevents completions
> > of readdir requests (on unrelated directories, by different processes, etc.)
> > out of order, PLEASE SAY SO.  I would really prefer not to have to fight
> > the readdir side of that mess; cancels are already bad enough ;-/
> 
> Hi Al... your ideas sound good to me, I'll try to get you good
> answers on stuff like the above sometime tomorrow...

OK, this is really, really completely untested, might chew your data,
bugger your dog, etc.  OTOH, if it somehow fails to do the above, it
ought to deal with cancels properly.

Pushed into #orangefs-untested, along with two wait_for_direct_io() fixes
discussed upthread.  This is _not_ all - it still needs saner "wait for slot"
logics, switching op->waitq to completion/killing loop in
wait_for_matching_downcall(), etc.
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