From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from gossamer.nmsrv.com ([208.70.244.21]:39928 "EHLO gossamer.nmsrv.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752936Ab1AYWi0 (ORCPT ); Tue, 25 Jan 2011 17:38:26 -0500 Message-ID: <4D3F50DA.3060208@gt.net> Date: Tue, 25 Jan 2011 14:38:18 -0800 From: Nathan March To: Trond Myklebust CC: linux-nfs@vger.kernel.org Subject: Re: Stale file not being refreshed automatically? References: <4D3F4A8A.7040003@gt.net> <1295994532.6867.12.camel@heimdal.trondhjem.org> In-Reply-To: <1295994532.6867.12.camel@heimdal.trondhjem.org> Content-Type: text/plain; charset=UTF-8; format=flowed Sender: linux-nfs-owner@vger.kernel.org List-ID: MIME-Version: 1.0 Ah ha, yes, it's using a stat call. What would be the proper C call to check the file exists without incurring the stat()? Thanks! - Nathan On 1/25/2011 2:28 PM, Trond Myklebust wrote: > On Tue, 2011-01-25 at 14:11 -0800, Nathan March wrote: >> Hi All, >> >> Having a strange issue, I've reproduced this both on nfs 3 and 4. >> Currently using v4 with: >> >> exports: >> /var/home/voyage >> 10.2.1.0/24(rw,fsid=0,async,wdelay,secure,no_subtree_check,anonuid=1000,anongid=1006) >> >> fstab: >> 10.2.1.1:/ /mnt/voyage nfs4 >> rsize=32768,wsize=32768,noatime,nosuid,rw,bg,hard,intr 0 0 >> >> Can be produced using these two commands on 2 machines: >> >> perl -le '$| = 1 ; while (1) { sleep 1; $res = -e "/home/voyage/test"; >> if ($res) { print "-e : $res"; } else { print "-e : $res ($!)"; } }' >> -e : 1 >> >> perl -le '$| = 1 ; while (1) { sleep 5; open(F, ">", >> "/home/voyage/test.foo"); close F; my $res = >> rename("/home/voyage/test.foo", "/home/voyage/test"); print "rename >> ($res)"; }' >> >> The first command will occasionally print out: -e : (Stale NFS file handle) >> >> Now according to http://nfs.sourceforge.net/#faq_a10 as of 2.6.12 the >> vfs should automatically retry when it gets a estale during path >> resolution. This doesn't appear to be happening though based on the >> errors I'm seeing. >> >> Anyone have any thoughts on what might be happening here? Or am I >> misinterpreting that faq entry? (This is on ext3 if it matters) > Does '-e' in perl only do a lookup, or does it result in a 'stat()' > call? If the latter, then your test is flawed: a stat() is a lookup+a > getattr, and the latter can definitely return ESTALE when you are > constantly replacing the file. > > Cheers > Trond