linux-kernel - Re: [PATCH -stable] block: destroy bdi before blockdev is unregistered.

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Message-ID: <20150429133512.GA4436@lst.de>
Date:	Wed, 29 Apr 2015 15:35:12 +0200
From:	Christoph Hellwig <hch@....de>
To:	NeilBrown <neilb@...e.de>
Cc:	Mike Snitzer <snitzer@...hat.com>, Jens Axboe <axboe@...com>,
	Azat Khuzhin <a3at.mail@...il.com>,
	Christoph Hellwig <hch@....de>,
	"Kernel.org-Linux-RAID" <linux-raid@...r.kernel.org>,
	Guoqing Jiang <GQJiang@...e.com>, Tejun Heo <tj@...nel.org>,
	Jan Kara <jack@...e.cz>, lkml <linux-kernel@...r.kernel.org>,
	device-mapper development <dm-devel@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH -stable] block: destroy bdi before blockdev is
	unregistered.

On Wed, Apr 29, 2015 at 07:25:30AM +1000, NeilBrown wrote:
> As bdi_set_min_ratio doesn't touch bdi->dev, there seems to be no need for
> the test, or the warning.
> 
> I wonder if it would make sense to move the bdi_set_min_ratio() call to
> bdi_destroy, and discard bdi_unregister??
> There is a comment which suggests bdi_unregister might be of use later, but
> it might be best to have a clean slate in which to add whatever might be
> needed??

This seems fine to me from the block dev point of view.  I don't really
understand the bdi_min_ratio logic, but Peter might have a better idea.
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