linux-ext4 - Re: [PATCH 0/4] jbd: possible filesystem corruption fixes

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Date:	Fri, 18 Apr 2008 12:26:47 -0700
From:	Mingming Cao <cmm@...ibm.com>
To:	Josef Bacik <jbacik@...hat.com>
Cc:	Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>,
	akpm@...ux-foundation.org, sct@...hat.com, adilger@...sterfs.com,
	linux-kernel@...r.kernel.org, linux-ext4@...r.kernel.org,
	jack@...e.cz, sugita <yumiko.sugita.yf@...achi.com>,
	Satoshi OSHIMA <satoshi.oshima.fk@...achi.com>
Subject: Re: [PATCH 0/4] jbd: possible filesystem corruption fixes

On Fri, 2008-04-18 at 10:09 -0400, Josef Bacik wrote:
> On Fri, Apr 18, 2008 at 10:00:54PM +0900, Hidehiro Kawai wrote:
> > Subject: [PATCH 0/4] jbd: possible filesystem corruption fixes
> > 
> > The current JBD is not sufficient for I/O error handling.  It can
> > cause filesystem corruption.   An example scenario:
> > 
> > 1. fail to write a metadata buffer to block B in the journal
> > 2. succeed to write the commit record
> > 3. the system crashes, reboots and mount the filesystem
> > 4. in the recovery phase, succeed to read data from block B
> > 5. write back the read data to the filesystem, but it is a stale
> >    metadata
> > 6. lose some files and directories!
> > 
> > This scenario is a rare case, but it (temporal I/O error)
> > can occur.  If we abort the journal between 1. and 2., this
> > tragedy can be avoided.
> > 
> > This patch set fixes several error handling problems to protect
> > from filesystem corruption caused by I/O errors.  It has been
> > done only for JBD and ext3 parts.
> >
> 

Could you sent Ext4/JBD2 version patches? Thanks!

> There doesn't seem like much point in taking these patches as Jan is rewriting
> the ordered mode path and most of these functions will be going away soon.
> Those patches seem like they will be coming soon and will obsolete these.
> 

I hope we have a better ordered mode very soon too. Just thought it's
still valid to fix the current ordered mode for people who uses
linux-2.6.25 kernel today. 

Mingming
> Josef 
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