linux-ext4 - Re: [RFC, PATCH 0/6] ext3: do not modify data on-disk when mounting read-only filesystem

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Message-Id: <20080305194220.f9cce55e.akpm@linux-foundation.org>
Date:	Wed, 5 Mar 2008 19:42:20 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Duane Griffin" <duaneg@...da.com>
Cc:	linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
	Theodore Tso <tytso@....edu>, sct@...hat.com,
	adilger@...sterfs.com
Subject: Re: [RFC, PATCH 0/6] ext3: do not modify data on-disk when mounting
 read-only filesystem

On Thu,  6 Mar 2008 01:59:08 +0000 "Duane Griffin" <duaneg@...da.com> wrote:

> At present, as discussed in this LKML thread,
> http://marc.info/?l=linux-kernel&m=117607695406580, when a dirty ext3
> filesystem is mounted read-only it writes to the disk while replaying the
> journal log and cleaning up the orphan list. This behaviour may surprise users
> and can potentially cause data corruption/loss (e.g. if a system is suspended,
> booted into a different OS, then resumed).
> 
> This patch series attempts to address this by using a block translation table
> instead of replaying the journal on a read-only filesystem.
> 
> Patches 1-3 are independent cleanups/bug-fixes for things I came across while
> working on this. They could be submitted separately and are not required for
> following patches.
> 
> Patch 4 is a refactoring change that simplifies the code prior to later
> substantive changes.
> 
> Patch 5 introduces the translation table and support for a truly read-only
> journal into jbd.
> 
> Patch 6 uses the facility introduced in patch 5 to add support for true
> read-only ext3.

I'll grab the first three for now, thanks.

Someone(tm) should do the jbd2 versions..
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