From: Ted Ts'o <tytso@mit.edu>
Subject: Re: [RFC v2] ext4: Don't send extra barrier during fsync if there
 are no dirty pages.
Date: Thu, 5 Aug 2010 12:45:04 -0400
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P.S.  If it wasn't clear, I'm still in favor of trying to coordinate
barriers across the whole file system, since that is much more likely
to help use cases that arise in real life.

   	    	       	     	     - Ted