linux-kernel - RE: [PATCH] NLM program ID for user space NLM server

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Message-ID: <A6FDE6B975803043804A49F12F49028E0F59DA@hawk.exanet-il.co.il>
Date:	Thu, 10 May 2007 20:11:19 +0300
From:	"Menny Hamburger" <menny@...net.com>
To:	"Trond Myklebust" <trond.myklebust@....uio.no>
Cc:	"Neil Brown" <neilb@...e.de>, <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] NLM program ID for user space NLM server

Well,

That maybe a better idea then what we do - we'll try it.

Thnx,
Menny

-----Original Message-----
From: Trond Myklebust [mailto:trond.myklebust@....uio.no] 
Sent: Thursday, May 10, 2007 7:04 PM
To: Menny Hamburger
Cc: Neil Brown; linux-kernel@...r.kernel.org
Subject: RE: [PATCH] NLM program ID for user space NLM server

On Thu, 2007-05-10 at 19:45 +0300, Menny Hamburger wrote:
> Yes, but in our case we don't care. This is a dedicated server where 
> we don't see any usage for NLM client. We just want to prevent the 
> kernel from taking the port in case of some accidental NFS mount that 
> ommitted 'nolock'.

Which is _wrong_. If you omit the 'nolock' mount option, then the client
_does_ use NLM locking, and so will need the RPC downcall.

If you don't need NLM locking, and want to make sure nobody else can
enable it, then you can triviall 'fix' this on your server by patching
it to force the nolock mount option. This isn't a patch that we
particularly want to see in mainline, though.

Trond

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