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Date: Sun, 22 Nov 2015 16:02:16 +0100
From: Christoph Hellwig <hch@lst.de>
To: Ilya Dryomov <idryomov@gmail.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>,
	Tejun Heo <tj@kernel.org>, Christoph Hellwig <hch@lst.de>,
	linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH] block: detach bdev inode from its wb in __blkdev_put()
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The right fix is to never point from the inode to a BDI.  I fixed this
with a lot of effort, and the BDI writeback series put it back a little
later.  We need to revert that damage (not neseccarily literally, but the
effect).