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[Xen-devel] Re: [patch] xen-blkback: sync I/O after backend disconnected

On 08/15/11 22:46, Christoph Hellwig wrote:
> 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?

When backend disconnect, I think we'd better flush all dirty data 
to the disk ASAP.

> 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.

xen-blkback support physical device and loopback file, so I think
here should be fsync_bdev()? 


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