From: Trond Myklebust <trond.myklebust@fys.uio.no>
Subject: Re: Linux' NFS locking b0rken?
Date: Thu, 27 May 2004 12:31:49 -0400
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Cc: "Ara.T.Howard" <Ara.T.Howard@noaa.gov>, Dan Stromberg <strombrg@dcs.nac.uci.edu>, Jeffrey Layton <jtlayton@poochiereds.net>,  nfs@lists.sourceforge.net
To: Olaf Kirch <okir@suse.de>
In-Reply-To: <20040527161412.GA19288@suse.de>
Errors-To: nfs-admin@lists.sourceforge.net

P=E5 to , 27/05/2004 klokka 12:14, skreiv Olaf Kirch:
> On Wed, May 26, 2004 at 12:04:01PM -0400, Trond Myklebust wrote:
> > Sure we could. The question is whether or not there are any application=
s
> > out there that set both flock and fcntl locks? They would break with
> > such a scheme.
>=20
> Don't they deserve to break?

Yep, but since the main users of flock tend to be mail-related
applications, we'd better check first. People tend to get grumpy when
their favourite MTA locks up and dies.

That said, I believe that RHEL-3 at least is returning an error these
days whenever you try to flock over NFS: I dunno if you are doing this
at SuSE yet?
Hopefully that will suffice to wipe the slate clean w.r.t. borken apps
(I know it caused my old uni to be aware of the problem and fix up a
couple of "movemail"s that were using flock).

> I'd rather make flock work over NFS (and have one FAQ less to deal with),
> than supporting patently broken apps.
>=20
> We could create a mount option or even better a lockd module option to
> make the old behavior selectable for those that need it.

lockd sysctl...

Cheers,
  Trond


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