linux-kernel - Re: Wrong free space reported for XFS filesystem

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Date:	Fri, 8 Sep 2006 12:33:39 +1000
From:	David Chinner <dgc@....com>
To:	Jesper Juhl <jesper.juhl@...il.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	xfs@....sgi.com
Subject: Re: Wrong free space reported for XFS filesystem

On Thu, Sep 07, 2006 at 04:17:53PM +0200, Jesper Juhl wrote:
> On 07/09/06, David Chinner <dgc@....com> wrote:
> >On Wed, Sep 06, 2006 at 10:54:34AM +0200, Jesper Juhl wrote:
> >> For your information;
> >>
> >> I've been running a bunch of benchmarks on a 250GB XFS filesystem.
> >> After the benchmarks had run for a few hours and almost filled up the
> >> fs, I removed all the files and did a "df -h" with interresting
> >> results :
.....
> >So the in-core accounting has underflowed by a small amount but the
> >on disk accounting is correct.
> >
> >We've had a few reports of this that I know of over the past
> >couple of years, but we've never managed to find a reproducable
> >test case for it.
> >Can you describe what benchmark you were runnin, wht kernel you were
> >using
> 
> The kernel is 2.6.18-rc6 SMP

Ok, so it's a current problem....

> >and whether any of the tests hit  an ENOSPC condition?
> >
> That I don't know.
> 
> The script I was running is this one :

<snip>

That doesn't really narrow down the scope at all. All that script
tells me is that problem is <waves hands> somewhere inside XFS....  :/
Can you try to isolate which of the loads is causing the problem?

That being said, this looks like a good stress load - I'll pass it
onto our QA folks...

Cheers,

Dave.
-- 
Dave Chinner
Principal Engineer
SGI Australian Software Group
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