itter Eric Van Hensbergen <ericvh@gmail.com> 1224265540 -0500

9p: add more conservative locking

During the reorganization some of the multi-theaded locking assumptions were
accidently relaxed.  This patch moves us back towards a more conservative 
locking strategy.

Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>

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