From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH 04/25] fs: Provide infrastructure for dynamic BDIs in
 filesystems
Date: Wed, 12 Apr 2017 01:09:28 -0700
Message-ID: <20170412080928.GD9830@infradead.org>
References: <20170329105623.18241-1-jack@suse.cz>
 <20170329105623.18241-5-jack@suse.cz>
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To: Jan Kara <jack@suse.cz>
Cc: linux-fsdevel@vger.kernel.org, linux-block@vger.kernel.org, Christoph Hellwig <hch@infradead.org>, linux-mtd@lists.infradead.org, linux-nfs@vger.kernel.org, Petr Vandrovec <petr@vandrovec.name>, linux-nilfs@vger.kernel.org, cluster-devel@redhat.com, osd-dev@open-osd.org, codalist@coda.cs.cmu.edu, linux-afs@lists.infradead.org, ecryptfs@vger.kernel.org, linux-cifs@vger.kernel.org, ceph-devel@vger.kernel.org, linux-btrfs@vger.kernel.org, v9fs-developer@lists.sourceforge.net, lustre-devel@lists.lustre.org

> +	if (sb->s_iflags & SB_I_DYNBDI) {
> +		bdi_put(sb->s_bdi);
> +		sb->s_bdi = &noop_backing_dev_info;

At some point I'd really like to get rid of noop_backing_dev_info and
have a NULL here..

Otherwise this looks fine..

Reviewed-by: Christoph Hellwig <hch@lst.de>