Re: COW improvements and always_cow support V3

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On Thu, Dec 06, 2018 at 09:09:30PM +0100, Christoph Hellwig wrote:
> I see the 050 one, and it looks odd.
> 
> > --- /tmp/xfstests/tests/generic/075.out	2017-02-28 09:23:56.049065953 -0800
> > +++ /var/tmp/xfstests//generic/075.out.bad	2018-12-03 22:11:12.392566688 -0800
> 
> This and a few other fsx tests assume you can always fallocate
> on XFS.  I sent a series for this:
> 
> https://www.spinics.net/lists/linux-xfs/msg23433.html
> 
> But I need to rework some of the patches a little more based on the
> review feedback.

"the patches"... as in the fstests patches, or the always_cow series?

> Similarly the badly fragmented warnings are simply expected, that
> is the nature of an always out of place write fs.  But the quota
> run turned up a few more failures than I expected for the always_cow
> mode, I can look into them.  But so far 95% of the always_cow bugs
> were either issues with the text, or genuine XFS COW path bugs not
> otherwise uncovered..

<nod> generic/311 and generic/476 regularly trigger assertion warnings
about negative quota counts, which I have yet to diagnose.  FWIW
fstests' post-run quota checking never complains about problems, which
means we're probably just moving quota accounting in the wrong order or
something.

--D



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