linux-kernel - Re: [git pull] first batch of ufs fixes

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Message-ID: <20170613014302.GC31671@ZenIV.linux.org.uk>
Date:   Tue, 13 Jun 2017 02:43:02 +0100
From:   Al Viro <viro@...IV.linux.org.uk>
To:     Richard Narron <comet.berkeley@...il.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [git pull] first batch of ufs fixes

On Mon, Jun 12, 2017 at 05:54:06PM -0700, Richard Narron wrote:

> Earlier today I could not reproduce the OpenBSD 6.1 ufs1 fsck error after
> Linux 4.12-rc5 copy of my >2GB file using "cp".
> 
> But later today I get the error when I copy using your "dd" method...
> 
> In any case I always get a ufs1 fsck error after the Linux rm and rmdir.

Interesting...  Could you put together an image (starting with zeroing the
device before newfs, and ideally with dd from /dev/zero to create files)
that would
	a) pass fsck on OpenBSD
	b) after rm on Linux fail the same
then convert it to qcow2 and publish?  Or just compress it - all free and
data blocks would contain only zeroes, so any kind of compression (gzip,
bzip2, whatever) would reduce the size to something more managable...