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由 Chuck Lever 提交于
Occasionally mountstats reports a negative retransmission rate. Ensure that two RPCs completing concurrently don't confuse the sums in the transport's op_metrics array. Since pNFS filelayout can invoke rpc_count_iostats() on another transport from xprt_release(), we can't rely on simply holding the transport_lock in xprt_release(). There's nothing for it but hard serialization. One spin lock per RPC operation should make this as painless as it can be. Signed-off-by: NChuck Lever <chuck.lever@oracle.com> Signed-off-by: NAnna Schumaker <Anna.Schumaker@Netapp.com>
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