linux-ext4 - Re: Something wrong with extent-based journal creation

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Message-id: <20090617080432.GC13073@webber.adilger.int>
Date:	Wed, 17 Jun 2009 02:04:32 -0600
From:	Andreas Dilger <adilger@....com>
To:	Eric Sandeen <sandeen@...hat.com>
Cc:	ext4 development <linux-ext4@...r.kernel.org>
Subject: Re: Something wrong with extent-based journal creation

On Jun 16, 2009  17:38 -0500, Eric Sandeen wrote:
> I've narrowed it down to the commit (961306d3) which creates the journal
> with extent format; if that's commented out, it works fine.

Hmm, this seems like it might be a troublesome feature...  Are we sure
that there is proper kernel/tool compatibility for an extent-mapped
journal?  At least none of the Lustre code has any support for this,
though they can handle the INCOMPAT_EXTENTS feature, and I don't think
this was present in older kernels either.

I haven't looked at the code for this yet, so it may be that it will
"just work", but if this is a new feature I would urge caution w.r.t.
compatibility before this is merged upstream (in either e2fsprogs or
the kernel).

Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.

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