J. Bruce Fields 5ce8ba25d6 nfsd4: allow restarting callbacks
If we lose the backchannel and then the client repairs the problem,
resend any callbacks.

We use a new cb_done flag to track whether there is still work to be
done for the callback or whether it can be destroyed with the rpc.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2011-01-11 15:04:11 -05:00
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