Eric Sandeen wrote:
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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