- If we fail to do a non-blocking acquire of a buf lock while doing a

   waiting sync pass we need to do a blocking acquire and restart.
   Another thread, typically the buf daemon, may have this buf locked and
   if we don't wait we can fail to sync the file.  This lead to a great
   variety of softdep panics because we rely on all dependencies being
   flushed before proceeding in several cases.

Reported by:	pho
Discussed with:	mckusick
Sponsored by:	EMC / Isilon Storage Division
MFC after:	2 weeks

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