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Date: Sun, 23 Jun 2013 15:42:50 -0400
From: Jim Rees <rees@umich.edu>
To: "Myklebust, Trond" <Trond.Myklebust@netapp.com>
Cc: James <purpleidea@gmail.com>, Chuck Lever <chuck.lever@oracle.com>,
        "linux-nfs@vger.kernel.org" <linux-nfs@vger.kernel.org>
Subject: Re: NFS clientaddr, kerberos
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Myklebust, Trond wrote:

  > > 	echo "options nfs callback_tcpport=<port>" >>/etc/modprobe.d/options-local.conf
  > This is very useful to know.
  > Is there any way to specify this as a mount option?
  
  No. The NFSv4 callback channel port number is a global property. It does
  not want to be a per-mount thing.

Would it make sense as a sysctl? I can sort of imagine cases where this
might be useful. Not that I'm volunteering to implement it.