From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Hellwig <hch@infradead.org>
Subject: Re: device mapper and the BLKFLSBUF ioctl
Date: Tue, 25 Oct 2016 06:07:12 -0700
Message-ID: <20161025130712.GA12717@infradead.org>
References: <alpine.LRH.2.02.1610211406290.9197@file01.intranet.prod.int.rdu2.redhat.com>
	<20161021200022.GA12580@redhat.com>
	<alpine.LRH.2.02.1610211616450.31606@file01.intranet.prod.int.rdu2.redhat.com>
	<20161024155756.GA48306@redhat.com>
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I think the right fix is to kill off the BLKFLSBUF special case in
brd.  Yes, it break compatibility - but in this case the compatibility
breaks more than it helps.