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From: Andreas Dilger <adilger@clusterfs.com>
Date: Fri, 19 Jul 2002 10:39:07 -0600
To: linux-kernel@vger.kernel.org
Subject: Re: [ANNOUNCE] Ext3 vs Reiserfs benchmarks
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On Jul 19, 2002  10:29 +0200, Matthias Andree wrote:
> What kernel version is necessary to achieve this on production kernels
> (i. e. 2.4)?
> 
> Does "consistent" mean "fsck proof"?
> 
> Here's what I tried, on Linux-2.4.19-pre10-ac3 (IIRC) (ext3fs):
> 
> (from memory, history not available, different machine):
> lvcreate --snapshot snap /dev/vg0/home
> e2fsck -f /dev/vg0/snap
> dump -0 ...
> 
> It reported zero dtime for one file and two bitmap differences.

That is because one critical piece is missing from 2.4, the VFS lock
patch.  It is part of the LVM sources at sistina.com.  Chris Mason has
been trying to get it in, but it is delayed until 2.4.19 is out.

> dump did not complain however, and given what e2fsck had to complain,
> I'd happily force mount such a file system when just a deletion has not
> completed.

You cannot mount a dirty ext3 filesystem from read-only media.

Cheers, Andreas
--
Andreas Dilger
http://www-mddsp.enel.ucalgary.ca/People/adilger/
http://sourceforge.net/projects/ext2resize/

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