Matthew D Fleming d19511c357 Add INVARIANTS checking that numfreebufs values are sane. Also add a
per-buf flag to catch if a buf is double-counted in the free count.
This code was useful to debug an instance where a local patch at Isilon
was incorrectly managing numfreebufs for a new buf state.

Reviewed by:	jeff
Approved by:	zml (mentor)
2010-06-11 17:03:26 +00:00
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