linux-kernel - Re: [patch] xen-blkback: sync I/O after backend disconnected

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Message-ID: <4E4A149E.5080608@oracle.com>
Date:	Tue, 16 Aug 2011 14:56:30 +0800
From:	Joe Jin <joe.jin@...cle.com>
To:	Christoph Hellwig <hch@...radead.org>
CC:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Jens Axboe <jaxboe@...ionio.com>,
	Ian Campbell <Ian.Campbell@...citrix.com>,
	Greg Marsden <greg.marsden@...cle.com>,
	Kurt C Hackel <KURT.HACKEL@...cle.com>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: 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()? 

Thanks,
Joe
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