linux-ext4 - Re: [PATCH] extend e2fsprogs functionality to add EXT2_FLAG

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Date:	Tue, 12 Jan 2010 17:51:18 +0100
From:	Michal Novotny <minovotn@...hat.com>
To:	Christoph Hellwig <hch@...radead.org>
CC:	Ric Wheeler <rwheeler@...hat.com>, linux-ext4@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] extend e2fsprogs functionality to add EXT2_FLAG_DIRECT
 option

On 01/12/2010 05:47 PM, Christoph Hellwig wrote:
> On Tue, Jan 12, 2010 at 05:43:21PM +0100, Michal Novotny wrote:
>    
>> So, do you think the problem is in the Xen backend drivers and to make
>> it working right in Xen the driver fix is needed?
>>      
> Yes, the Xen blkback driver just submits I/O directly without using
> the right interfaces to force cache coherency.  It might be relatively
> easy to hack a call in to flush all caches when it starts up, but given
> how it bypasses all abstractions it's almost impossible to give full
> coherency as if using the normal block device interfaces.
>
>    
Ok, this way the fix to the drivers should be done. Thanks for your 
investigation. I just forwarded your reply to other members of my team.

Thanks,
Michal
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