linux-ext4 - Re: Problem with fsstress on powerpc

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Message-ID: <20080409083341.GC944@dmon-lap.sw.ru>
Date:	Wed, 9 Apr 2008 12:33:41 +0400
From:	Dmitri Monakhov <dmonakhov@...nvz.org>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc:	Eric Sandeen <sandeen@...hat.com>, Mingming Cao <cmm@...ibm.com>,
	ext4 development <linux-ext4@...r.kernel.org>
Subject: Re: Problem with fsstress on powerpc

On 13:51 Wed 09 Apr     , Aneesh Kumar K.V wrote:
> On Wed, Apr 09, 2008 at 11:44:57AM +0400, Dmitri Monakhov wrote:
> > On 20:54 Tue 08 Apr     , Aneesh Kumar K.V wrote:
> > > Hi All,
> > > 
> > > Test case: fsstress with fallocate test case added.
> > This may happens because of direct write.
> > Please add  exact fsstess command and options.
> > > 
> 
> fsstress -c -n1000 -p1000  -d /mnt/tmp/
> 
> What i found was also related. The file which had errors had the below
> operations on them.
> 
> 82/901: dread d16/d20/d22/d2d/d63/d68/d9a/f93 [622592,53248] 0
> 82/939: dwrite d16/d20/d22/d2d/d63/d68/d9a/f93 [1093632,77824] 28
> 
> 
> 9/863: fallocate d1/d2d/d32/d8f/d97/d108/d9b/ffb [2041,75851] 28
> 
> 
> 18/733: fallocate d9/ddd/f86 [481025,18486] 0
> 18/735: dwrite d9/ddd/f86 [679936,36864] 0
> 18/764: dread d9/ddd/f86 [53248,8192] 0
> 18/910: dwrite d9/ddd/f86 [1454080,4096] 28
> 18/999: dwrite d9/ddd/f86 [1798144,61440] 28
> 
> 
> But what would happen during direct write that cause this ?
Ohh it is long live bug in direct-io error handling logic:
http://lkml.org/lkml/2006/12/18/103
So IMHO it is beter to disable direct-io writes in your case.
> 
> -aneesh
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