From: "Lever, Charles" <Charles.Lever@netapp.com>
Subject: RE: possible client stale filehandle bug?
Date: Wed, 16 Feb 2005 13:18:41 -0800
Message-ID: <482A3FA0050D21419C269D13989C61130853976D@lavender-fe.eng.netapp.com>
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Cc: "Garrick Staples" <garrick@usc.edu>, <nfs@lists.sourceforge.net>
To: "Neil Horman" <nhorman@redhat.com>
Sender: nfs-admin@lists.sourceforge.net
Errors-To: nfs-admin@lists.sourceforge.net

hi neil-

> >>It seems that the Solaris clients never report any such=20
> errors, only the Linux
> >>clients.  However, watching 'snoop' on the Solaris NFS=20
> server, I see that it IS
> >>returning stale file handles to both OSes, but Solaris=20
> clients seem to retry
> >>the request several times; and the Linux clients=20
> immediately pass the error up
> >>to the application.
> >>
> >>Is there some condition that the 2.4 kernel is handling incorrectly?
> >=20
> >=20
> > I do not believe that Solaris redrives ESTALE on read, but=20
> they may do
> > it on open(). Linux does not redrive either case. See the many
> > discussions in the NFS list archives for why.
> >=20
>=20
> Solaris does in fact retry on operations on ESTALE errors,=20
> definately on=20
> open, and I think on read/readdir/stat/etc. as well.  We had some=20
> discussion about tht here recently.

as far as i know Solaris doesn't redrive on read or write, but only
during pathname resolution.  redriving a read or write will only work in
the case where the server has taken the export offline temporarily; if
the file handle really is bad, then redriving a read or write is
probably safe, but won't accomplish anything.

i have a patch that adds support for pathname resolution retry to 2.6
(now in Trond's NFS_ALL for 2.6.11-rc4) and a pair of patches that
implement this for RHEL 3.0 that i've sent to steve and al viro for
review.


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