From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH] writeback: Don't wait for completion in
 writeback_inodes_sb_nr
Date: Mon, 11 Jul 2011 16:11:57 -0400
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Cc: Curt Wohlgemuth <curtw@google.com>,
	Christoph Hellwig <hch@infradead.org>,
	Al Viro <viro@zeniv.linux.org.uk>,
	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
	fengguang.wu@intel.com
To: Jan Kara <jack@suse.cz>
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On Mon, Jul 11, 2011 at 09:48:35PM +0200, Jan Kara wrote:
>   Well, they're not exactly cheap (journaling filesystems have to force
> transaction commits and wait for them) but that does not really matter.
> The real problem is that to wait for IO completion you need some list of
> inodes you want to wait for and you can currently get such list only from
> superblock.

All block device inodes sit on blockdev_superblock, we got rid of inodes
without a superblock long time ago.