- Add CTR calls to trace the lifecycle of a buffer.

 - Remove some KASSERTs which are invalid if the appropriate lock is
   not held.
 - Slightly restructure bremfree() so that it is more sane.
 - Change the flush code in bdwrite() to avoid acquiring a mutex
   whenever possible.
 - Change the flush code in bdwrite() to avoid holding the bufobj mutex
   while calling buf_countdeps().  This introduces a lock-order
   relationship with the softdep lock that can not otherwise be resolved.
 - Don't set B_DONE until bufdone() is complete, otherwise another
   processor may believe the buf is done before it is.
 - Only acquire Giant if the caller has set b_iodone.  Don't grab giant
   around normal bufdone() calls.

Sponsored By:	Isilon Systems, Inc.

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