because LASSERT on both the data supplied by a client, and the data
on disk is dangerous and incorrect.
+Severity : enhancement
+Bugzilla : 10718
+Description: Slow trucate/writes to huge files at high offsets.
+Details : Directly associate cached pages to lock that protect those pages,
+ this allows us to quickly find what pages to write and remove
+ once lock callback is received.
+
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2007-08-10 Cluster File Systems, Inc. <info@clusterfs.com>