linux-ext4 - Re: REGRESSION: [PATCH 04/12] ext4: Disable merging of uninitialized extents

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Message-ID: <20130214190555.GA6641@thunk.org>
Date:	Thu, 14 Feb 2013 14:05:55 -0500
From:	Theodore Ts'o <tytso@....edu>
To:	Jan Kara <jack@...e.cz>
Cc:	Dmitry Monakhov <dmonakhov@...nvz.org>, linux-ext4@...r.kernel.org
Subject: Re: REGRESSION: [PATCH 04/12] ext4: Disable merging of uninitialized
 extents

On Thu, Feb 14, 2013 at 05:11:16PM +0100, Jan Kara wrote:
>   OK, so I've debugged this. It wasn't actually that hard. The problem is
> that mpage_da_map_and_submit() prepares extent with e.g. 256 blocks but
> later we submit a shorter bio e.g. because it cannot carry that many pages.
> So ->end_io is called only for first 128 blocks or so. I spotted this
> problem already before, just it didn't come up when Ted sent me this bug
> report.

So can we get a corruption without these patches, but it was a lot
harder to hit that case before?

						- Ted
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