linux-ext4 - Re: hunt for 2.6.37 dm-crypt+ext4 corruption? (was: Re: dm-crypt barrier support is effective)

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Date:	Sat, 11 Dec 2010 21:34:15 -0500
From:	Ted Ts'o <tytso@....edu>
To:	Jon Nelson <jnelson@...poni.net>
Cc:	Matt <jackdachef@...il.com>, Chris Mason <chris.mason@...cle.com>,
	Andi Kleen <andi@...stfloor.org>,
	Mike Snitzer <snitzer@...hat.com>,
	Milan Broz <mbroz@...hat.com>,
	linux-btrfs <linux-btrfs@...r.kernel.org>,
	dm-devel <dm-devel@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	htd <htd@...cy-poultry.org>, htejun <htejun@...il.com>,
	linux-ext4 <linux-ext4@...r.kernel.org>
Subject: Re: hunt for 2.6.37 dm-crypt+ext4 corruption? (was: Re: dm-crypt
 barrier support is effective)

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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