Date: Mon, 6 Apr 2009 13:13:00 +0100 (BST) From: Robert Watson <rwatson@FreeBSD.org> To: zachary.loafman@isilon.com Cc: arch@freebsd.org Subject: Re: VOP_LEASE Message-ID: <alpine.BSF.2.00.0904061311020.34905@fledge.watson.org> In-Reply-To: <20090405201048.GB6319@isilon.com> References: <20080412021209.W43186@desktop> <alpine.BSF.2.00.0904051829490.12639@fledge.watson.org> <20090405201048.GB6319@isilon.com>
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On Sun, 5 Apr 2009, zachary.loafman@isilon.com wrote: > On Sun, Apr 05, 2009 at 06:31:59PM +0100, Robert Watson wrote: >> >> On Sat, 12 Apr 2008, Jeff Roberson wrote: >> >>> As far as I can tell this has never been used. Unless someone can show me >>> otherwise I'm going to go ahead and remove it. >> >> (A year, +/- one week, passes...) >> >> Since we now have an NFSv4 client/server and it doesn't use VOP_LEASE, and >> NQNFS is long-gone, I propose we revisit removing VOP_LEASE [...] > > I haven't had a chance to dig into the code, but can you explain how the v4 > server is granting delegations without something like VOP_LEASE? This was > actually a conversation I was going to prep for prior to BSDcan. We already > have a cluster-coherent oplock mechanism for CIFS, and we were planning on > trying to hook that in with v4 delegations, but our FS very much needs VOP > calls to accomplish things like delegations. We can't use a local lease > manager. > > Like I said, I need to look at code; it's very likely the existing VOP_LEASE > isn't right for us, anyways. Zach, Let me know if/when you're ready for the VOP_LEASE-axing to take place, and I'll move ahead with it. And we should perhaps add delegation/oplock/etc mechanisms to our agenda for the devsummit? Robert N M Watson Computer Laboratory University of Cambridge
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