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Date: Sat, 11 Dec 2010 21:34:15 -0500
From: "Ted Ts'o" <tytso@mit.edu>
To: Jon Nelson <jnelson@jamponi.net>
Cc: Matt <jackdachef@gmail.com>, Chris Mason <chris.mason@oracle.com>,
        Andi Kleen <andi@firstfloor.org>, Mike Snitzer <snitzer@redhat.com>,
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        htd <htd@fancy-poultry.org>, htejun <htejun@gmail.com>,
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Subject: Re: hunt for 2.6.37 dm-crypt+ext4 corruption? (was: Re: dm-crypt
 barrier support is effective)
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One experiment --- can you try this with the file system mounted with
data=writeback, and see if the problem reproduces in that journalling
mode?

I want to rule out (if possible) journal_submit_inode_data_buffers()
racing with mpage_da_submit_io().  I don't think that's the issue, but
I'd prefer to do the experiment to make sure.  So if you can use a
kernel and system configuration which triggers the problem, and then
try changing the mount options to include data=writeback, and then
rerun the test, and let me know if the problem still reproduces, I'd
be really grateful.

Thanks,

					- Ted
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