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Message-ID: <20110317225908.GB2445@os.inf.tu-dresden.de> Date: Thu, 17 Mar 2011 23:59:08 +0100 From: Adam Lackorzynski <adam@...inf.tu-dresden.de> To: "J. Bruce Fields" <bfields@...ldses.org> Cc: Trond Myklebust <Trond.Myklebust@...app.com>, linux-kernel@...r.kernel.org, linux-nfs@...r.kernel.org Subject: Re: 2.6.38: Quota over NFS4 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@...inf.tu-dresden.de Lackorzynski http://os.inf.tu-dresden.de/~adam/ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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