linux-ext4 - Re: [PATCH 1/5] jbd: strictly check for write errors on data buffers

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Message-Id: <20080605092006.ba7dceef.akpm@linux-foundation.org>
Date:	Thu, 5 Jun 2008 09:20:06 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Theodore Tso <tytso@....edu>
Cc:	Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>,
	Jan Kara <jack@...e.cz>, sct@...hat.com, adilger@....com,
	linux-kernel@...r.kernel.org, linux-ext4@...r.kernel.org,
	jbacik@...hat.com, cmm@...ibm.com, yumiko.sugita.yf@...achi.com,
	satoshi.oshima.fk@...achi.com
Subject: Re: [PATCH 1/5] jbd: strictly check for write errors on data
 buffers

On Thu, 5 Jun 2008 10:29:48 -0400 Theodore Tso <tytso@....edu> wrote:

> On Thu, Jun 05, 2008 at 08:33:27PM +0900, Hidehiro Kawai wrote:
> > 
> > My patch doesn't change the policy.  JBD aborts the journal when
> > it detects I/O error in file data since 2.6.11.  Perhaps this patch:
> > http://marc.info/?l=linux-kernel&m=110483888632225
> > I just added missing error checkings.
> > 
> 
> Looking at the code paths touched by patch you referenced, you are
> correct.  And Andrew even signed off on it.  :-)
> 
> But if someone was only examining the patch, it wasn't obvious that
> the journal was getting aborted when the JBD layer was forcing buffers
> from t_sync_datalist to disk.  So I suspect the change went in without
> proper consideration of the net effect.  You just called it out
> explicitly in the subject line, which caused Andrew to ask some good
> questions; questions that weren't asked in 2005.

Sigh. An object lesson in the value of good changelogging :(

I guess we need to undo this.  And yes, propagating errors into AS_EIO
is the way.  I guess that's safe without holding lock_page(), as long
as the bh is pinned.

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