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NLM version 4 requests estimate the call and reply header sizes rather conservatively, using the very maximum size allowed in the protocol even though Linux always uses only a small fraction of the allowable space. Reduce the size of caller and lock arguments to conserve RPC buffer space while XDR encoding NLM4 arguments. Add compile-time checks to ensure the hostname string won't overflow NLM protocol maximums. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>