Cache coherence thoughts.

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+The BlueSky lock manager is used to coordinate access to the same
+filesystem among independent BlueSky processes.  As presently designed,
+the lock manager itself is not fault tolerant nor meant for the wide
+area.
+
+TODO: Investigate whether there are any existing tools which could be
+used instead.  Something like ZooKeeper might work, but is probably too
+heavy-weight for now.
+
+
+Objects can have small data values associated with them (i.e., version
+number associated with an inode)
+
+Cache states (for a single object):
+    MESI?