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Date: Mon, 15 Aug 2011 10:46:10 -0400
From: Christoph Hellwig <hch@infradead.org>
To: Joe Jin <joe.jin@oracle.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
        Jens Axboe <jaxboe@fusionio.com>,
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Subject: Re: [patch] xen-blkback: sync I/O after backend disconnected
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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.