bb792609dc
Use CLSET_TIMEOUT to set the timeout for connections to DSs instead of specifying a timeout on each RPC. This is done so that SO_SNDTIMEO is set on the TCP socket as well as specifying a time limit when waiting for an RPC reply. Useful if the send queue for the TCP connection has become constipated, due to a failed DS. The choice of lease_duration / 4 is fairly arbitrary, but seems to work ok, with a lower bound of 10sec. For client connections to a DS, set the retry limit to vfs.nfsd.dsretries, which is 2 by default. This patch should only affect pNFS connections to DSs. This patch requires r336542. MFC after: 2 weeks
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