From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Hellwig <hch@infradead.org>
Subject: Re: [patch] xen-blkback: sync I/O after backend disconnected
Date: Mon, 15 Aug 2011 10:46:10 -0400
Message-ID: <20110815144610.GA3707@infradead.org>
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To: Joe Jin <joe.jin@oracle.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>, Jens Axboe <jaxboe@fusionio.com>, Ian Campbell <Ian.Campbell@eu.citrix.com>, Greg Marsden <greg.marsden@oracle.com>, Kurt C Hackel <KURT.HACKEL@oracle.com>, "xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
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On Mon, Aug 15, 2011 at 12:55:02PM +0800, Joe Jin wrote:
> When backend disconnect, sync IO requests to the disk.

Care to explain why?

Also you'll just need a sync_blockdev, fsync_bdev does far to many
things that don't make any sense when you don't have a file system
mounted on a device.