linux-kernel - Re: 2.6.21-git10/11: files getting truncated on xfs? or maybe an nlink problem?

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Message-ID: <Pine.LNX.4.61.0705121320240.9570@yvahk01.tjqt.qr>
Date:	Sat, 12 May 2007 13:21:41 +0200 (MEST)
From:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
To:	Matt Mackall <mpm@...enic.com>
cc:	Jeremy Fitzhardinge <jeremy@...p.org>, David Chinner <dgc@....com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	xfs@....sgi.com, michal.k.k.piotrowski@...il.com
Subject: Re: 2.6.21-git10/11: files getting truncated on xfs? or maybe an
 nlink problem?


On May 10 2007 10:38, Matt Mackall wrote:
>> 
>>     for i in `seq 20`; do
>>     	hg clone -U --pull a b-$i
>>     	hg verify b-$i		# always OK
>>     	umount /home
>>     	sleep 5
>>     	mount /home
>>     	hg verify b-$i		# often found truncated files
>>     done
>>       
[...]
>
>This test looks like it should consist solely of open-for-append and
>write on about 20k files in the target directory. Because of the
>--pull, no hardlinks are involved. It shouldn't be all that different
>from doing tar cf - a | tar xf - b.
>
>The files get visited in alphabetical order, so the start of the
>corruption may be telling.

You should not assume alphabetical order. Filesystems may be free to
reorder things and return them (1) randomly like in a hash (2) by
creation time during readdir().


	Jan
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