From: J. Bruce Fields <bfields@citi.umich.edu>
Date: Mon, 8 Mar 2010 04:39:01 +0000 (-0500)
Subject: nfsd4: allow 4.0 clients to change callback path
X-Git-Tag: v2.6.35-rc1~489^2~23
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4b21d0defcc9680da8a694e92d5fe8eb668c2c0b;p=pandora-kernel.git

nfsd4: allow 4.0 clients to change callback path

The rfc allows a client to change the callback parameters, but we didn't
previously implement it.

Teach the callbacks to rerun themselves (by placing themselves on a
workqueue) when they recognize that their rpc task has been killed and
that the callback connection has changed.

Then we can change the callback connection by setting up a new rpc
client, modifying the nfs4 client to point at it, waiting for any work
in progress to complete, and then shutting down the old client.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
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