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Re: 2.6.38: Quota over NFS4

To: "J. Bruce Fields" <bfields@xxxxxxxxxxxx>
Subject: Re: 2.6.38: Quota over NFS4
From: Adam Lackorzynski <adam@xxxxxxxxxxxxxxxxxxxx>
Date: Thu, 24 Mar 2011 23:28:07 +0100
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>, linux-nfs@xxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx
In-reply-to: <20110324175106.GB1886@xxxxxxxxxxxx>
References: <20110320214316.GB26036@xxxxxxxxxxxx> <20110321184043.GC4992@xxxxxxxxxxxxxxxxxxxx> <20110321222301.GB472@xxxxxxxxxxxx> <20110322221305.GA5857@xxxxxxxxxxxxxxxxxxxx> <20110323150328.GD23418@xxxxxxxxxxxx> <20110323174052.GE5005@xxxxxxxxxxxxxxxxxxxx> <20110323190632.GA26306@xxxxxxxxxxxx> <20110323223017.GA5177@xxxxxxxxxxxxxxxxxxxx> <20110324171704.GA1784@xxxxxxxxxxxxx> <20110324175106.GB1886@xxxxxxxxxxxx>
User-agent: Mutt/1.5.20 (2009-06-14)
On Thu Mar 24, 2011 at 13:51:06 -0400, J. Bruce Fields wrote:
> On Thu, Mar 24, 2011 at 01:17:05PM -0400, Christoph Hellwig wrote:
> > On Wed, Mar 23, 2011 at 11:30:17PM +0100, Adam Lackorzynski wrote:
> > > I probably mistyped something and thus bisected again:
> > 
> > maybe this is just a symptom.  When was the nfs4 code converted
> > to just use a single open struct file, and what are the lifetime
> > rules for it?  It would easily be that a long alive file might
> > make XFS keep persistent preallocations longer or similar issues.
> 
> Definitely, the commit he's bisect to there seems much more likely to be
> a culprit.  I'll take a closer look....
> 
> > Adam, can you create a loop filesystem with ext3 or something else
> > on it and see if the problem is XFS-specific?
> 
> Originally it sounded like he was able to reproduce this only on one
> specific filesystem so I wondered whether there was something particular
> to that filesystem.

I just found out it happens also with a newly created xfs and also with
ext3 and ext4. The reason that I did not see that initially is that the
script I'm using needs to be on the same fs which wasn't the case when I
initially tried it with a new fs. The sequence I'm using is:

# mount x.x.x:/home /tmp/st
# su - foo
$ cd /tmp/st/foo/x
$ ../test-script
foo@host:/tmp/st/foo/x$ ../test-script 
Filesystem            Inodes   IUsed   IFree IUse% Mounted on
x.x.x:/home    39321600      15 39321585    1% /tmp/st
Filesystem            Inodes   IUsed   IFree IUse% Mounted on
x.x.x:/home    39321600      16 39321584    1% /tmp/st
Filesystem            Inodes   IUsed   IFree IUse% Mounted on
x.x.x:/home    39321600      16 39321584    1% /tmp/st



test-script:
#! /bin/sh

df -i .
cp /bin/ls x1
df -i .
cat x1 > /dev/null
rm x1
df -i .






Adam
-- 
Adam                 adam@xxxxxxxxxxxxxxxxxxxx
  Lackorzynski         http://os.inf.tu-dresden.de/~adam/

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