15bed8c46b
During code inspection I noticed that the n_direofoffset field of the NFS node was being manipulated without any lock being held to make it SMP safe. This patch adds locking of the NFS node's mutex around handling of n_direofoffset to make it SMP safe. I have not seen any failure that could be attributed to n_direofoffset being manipulated concurrently by multiple processors, but I think this is possible, since directories are read with shared vnode locking, plus locks only on individual buffer cache blocks. However, there have been as yet unexplained issues w.r.t reading large directories over NFS that could have conceivably been caused by concurrent manipulation of n_direofoffset. MFC after: 2 weeks
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