linux-ext4 - [PATCH 0/4] ext3/jbd: possible filesystem corruption fixes (take 3)

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Message-ID: <488876D3.80004@hitachi.com>
Date:	Thu, 24 Jul 2008 21:34:27 +0900
From:	Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>
To:	akpm@...ux-foundation.org, sct@...hat.com
Cc:	linux-kernel@...r.kernel.org, linux-ext4@...r.kernel.org,
	jack@...e.cz, jbacik@...hat.com, cmm@...ibm.com, tytso@....edu,
	adilger@...sterfs.com, snitzer@...il.com, tglx@...utronix.de,
	yumiko.sugita.yf@...achi.com, satoshi.oshima.fk@...achi.com
Subject: [PATCH 0/4] ext3/jbd: possible filesystem corruption fixes (take 3)

This patch set is the take 3 of fixing error handling problem in
ext3/JBD.  The previous discussion can be found here:
http://kerneltrap.org/mailarchive/linux-kernel/2008/6/2/2002094

Problem
=======
Currently some error checkings are missing, so the journal cannot abort
correctly.  This can cause a filesystem corruption.  Missing error
checkings are:

(1) error check for the metadata writes to the journal before the
    commit (addressed by PATCH 1/4)
(2) error check for checkpointing and replay (addressed by PATCH 2/4
    and 3/4)

PATCH 2/4 makes another problem worse; replaying old journaled
metadata can overwrite the latest metadata on the filesystem and
break its consistency.  This is fixed by PATCH 4/4.


Changes since Take 2
====================
[PATCH x/x]
o file data error handling fixes were separated to other patch set

[PATCH 3/4]
o fix return value handlings (trivial)

[PATCH 4/4]
o newly added to prevent unjournaled metadata buffers from being
  written to the filesystem on abort

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


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