linux-ext4 - Re: [LSF/MM TOPIC] Drop ext2/ext3 codebase? When?

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Date:	Thu, 3 Feb 2011 23:57:25 +0200
From:	Amir Goldstein <amir73il@...il.com>
To:	Eric Sandeen <sandeen@...hat.com>
Cc:	Michael Rubin <mrubin@...gle.com>, Jan Kara <jack@...e.cz>,
	lsf-pc@...ts.linuxfoundation.org, linux-fsdevel@...r.kernel.org,
	linux-ext4@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [LSF/MM TOPIC] Drop ext2/ext3 codebase? When?

On Thu, Feb 3, 2011 at 9:49 PM, Eric Sandeen <sandeen@...hat.com> wrote:
>
> On 2/3/11 1:32 PM, Michael Rubin wrote:
> > On Thu, Feb 3, 2011 at 7:08 AM, Eric Sandeen <sandeen@...hat.com> wrote:
> >> If we can have a real plan for moving in this direction though, I'd
> >> support it.  I'm just not sure how we get enough real testing under
> >> our belts to be comfortable with dropping ext[23], especially as
> >> most distros now default to ext4 anyway.
> >
> > Eric what sort of testing are you looking for?
>
> Anything, the more formal or more widespread the better.
>
> I just don't think it's used much this way today...
>
> We can start with xfstests etc but I'd be more concerned about
> unexpected behavioral or performance changes.
>
> > I admit I like having ext2 around for comparisons in bug situations.
> > It really helps to isolate the problem area. How painful is the
> > upkeep?
>
> since ext4 was merged, about 450 commits to ext2 & ext3 files.
>
> since 2.6.32, about 150 commits.
>

Can you give a rough estimate of how those commits diverge between
bugfixes, kernel API changes, code cleanups?

Next3 has been following ext3 since 2.6.31 and I remember changes of
the 2 latter,
but not many major bugfixes.

I hardly think we can get away with throwing out ext3 code base, but
maybe it can go
into bugfixes-only mode? that is unless Jan likes to apply cleanups ;-)

Amir.

> Translating that into pain units, I dunno.  In distro-land, I often
> have bugfixes that need to hit 2 or 3 of the filesystems as well.
>
> -Eric
>
> > mrubin
> > --
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