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Date: Tue, 25 Jan 2011 14:11:22 -0800
From: Nathan March <nathan@gt.net>
To: linux-nfs@vger.kernel.org
Subject: Stale file not being refreshed automatically?
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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)

- Nathan