linux-ext4 - Re: status of the ext3/jbd error handling enhancement patches

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Date:	Wed, 22 Oct 2008 13:54:26 +0900
From:	Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>
To:	Simon Kirby <sim@...nation.com>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: status of the ext3/jbd error handling enhancement patches

Hi Simon,

Simon Kirby wrote:

> Hi Hidehiro,
> 
> It seems you have been looking the code behind the problems I reported
> (see linux-ext4 post "EXT3 way too happy with write errors", October
> 14th).
> 
> Are you aware of any patches that look at failed writes outside of JBD
> also not noticing write errors?  It seems that not all write errors are
> causing EXT3 to take the action of aborting the journal, which seems to
> be a very bad idea (an example in my previous posting, testing with fault
> injection).

Which kernel did you use for testing?  If you use the latest -mm kernel
(2.6.27-rc5-mm1) with a patch at http://userweb.kernel.org/~akpm/mmotm/
broken-out/jbd-test-bh_write_eio-to-detect-errors-on-metadata-buffers.patch,
most of this kind of problems may be solved.  But some additional works are
still needed; nobody checks I/O error on updating a journal super block.
 
> Anyway, I would be very happy to test out any patches in this area, and
> if none exist, I will try to track down why it is ignoring some of these
> errors.

Thanks,
-- 
Hidehiro Kawai
Hitachi, Systems Development Laboratory
Linux Technology Center

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