From: Peter Staubach <staubach@redhat.com>
Subject: Re: [PATCH] locks: provide a file lease method
 enabling	cluster-coherent leases
Date: Fri, 01 Jun 2007 09:14:53 -0400
Message-ID: <46601BCD.8050609@redhat.com>
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Cc: linux-fsdevel@vger.kernel.org, nfs@lists.sourceforge.net,
	"J. Bruce Fields" <bfields@citi.umich.edu>,
	David Teigland <teigland@redhat.com>,
	Marc Eshel <eshel@almaden.ibm.com>
To: "J. Bruce Fields" <bfields@fieldses.org>
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J. Bruce Fields wrote:
> From: J. Bruce Fields <bfields@fieldses.org>
>
> Currently leases are only kept locally, so there's no way for a distributed
> filesystem to enforce them against multiple clients.  We're particularly
> interested in the case of nfsd exporting a cluster filesystem, in which
> case nfsd needs cluster-coherent leases in order to implement delegations
> correctly.

A couple of naive questions --

Do the semantics of these leases really match the requirements from NFSv4?
Does the internal NFSv4 server state also need to be shared?

    Thanx...

       ps

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