Eric Sandeen wrote:
quoted text
> We saw problems w/ xfs doing AIO+DIO into a sparse file.
> https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=217098
> 
> It seemed that xfs was doing "extent conversion" at the wrong offsets, so
> written regions came up as unwritten (zeros) and stale data was exposed
> in the region after the write.  Thanks to Peter Backes for the very
> nice testcase.
> 
> This also broke xen with blktap over xfs.

Hrmph.  Zach's changes in -mm magically made this go away... I was about 
to submit a proper patch against -mm but it seem to be not needed.

So, now digging around to see why that is, and what exactly "fixed" things.

-Eric

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