Re: [PATCH] extend e2fsprogs functionality to add EXT2_FLAG_DIRECToption

[Michal Novotny]

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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