Re: 2.6.38: Quota over NFS4

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On Thu Mar 17, 2011 at 18:27:32 -0400, J. Bruce Fields wrote:
> On Thu, Mar 17, 2011 at 10:33:03PM +0100, Adam Lackorzynski wrote:
> > 
> > On Thu Mar 17, 2011 at 13:38:05 -0400, J. Bruce Fields wrote:
> > > On Thu, Mar 17, 2011 at 02:32:47PM +0100, Adam Lackorzynski wrote:
> > > > Hello,
> > > > 
> > > > I'm seeing a problem with quotas in a system where the server running
> > > > 2.6.38 exports an XFS filesystem via NFS4 to a client. The client kernel
> > > > version does not seem to play a role, checked with 2.6.38, 2.6.37 and
> > > > 2.6.36. The following script and output show the problem:
> > > > 
> > > > #! /bin/sh
> > > > 
> > > > quota | grep home
> > > > du
> > > > cp /bin/ls x1
> > > > du
> > > > cat x1 > /dev/null
> > > > rm x1
> > > > du
> > > > quota | grep home
> > > > 
> > > > Output:
> > > > 
> > > >    homes:/home/ 8194720  9072000 9174400          403670  500000  550000        
> > > > 0       .
> > > > 96      .
> > > > 0       .
> > > >    homes:/home/ 8194816  9072000 9174400          403671  500000  550000        
> > > > 
> > > > 
> > > > As can be seen the 96 kb are still accounted on the quota of the user.
> > > > Removing the 'cat' command from the script makes the quota be ok again
> > > > (original value). Also mounting via nfs3 does not exhibit it, same for running
> > > > the script on the nfs-server directly.
> > > 
> > > Does "df" show the same problem?
> > 
> > With '/bin/ls' it does not change at all, so I took a bigger binary
> > which yields to:
> > 
> >    homes:/home/ 8203780  9072000 9174400          403688  500000  550000        
> > 0       .
> > Filesystem           1K-blocks      Used Available Use% Mounted on
> >   homes:/home        513671168 335251456 178419712  66% /tmp/xx
> > 4592    .
> > Filesystem           1K-blocks      Used Available Use% Mounted on
> >   homes:/home        513671168 335256576 178414592  66% /tmp/xx
> > 0       .
> > Filesystem           1K-blocks      Used Available Use% Mounted on
> >   homes:/home        513671168 335256576 178414592  66% /tmp/xx
> >    homes:/home/ 8208372  9072000 9174400          403689  500000  550000        
> > 
> > So yes, it seems to be there as well.
> 
> It might be easier to see with "df -i" (assuming we're leaking an
> inode).

Result is as expected, inode goes one up and not down again.
 
> > > And does unmounting/remounting on the
> > > client clear the problem?
> > 
> > No.
> > 
> > > (Or that, in combination with stopping the
> > > server, unmounting the xfs export, remounting it, and restarting?)
> > 
> > I rebooted once, got a recovery and then the quotas were ok again (and
> > supposedly the used blocks as well). I assume a unmount/mount would show
> > the same behaviour but requires a bit of preparation to try out.
> > 
> > > Was there an earlier server version that didn't exhibit this problem?
> > 
> > Had 2.6.37 on the server before and that was fine regarding this.
> 
> OK, thanks.  Sounds like a server bug, but I'm not managing to reproduce
> it here yet....


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