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    |   xen-devel
[Xen-devel] Re: [RFC PATCH 35/35] Add Xen virtual block device	driver. 
| To: | Anthony Liguori <aliguori@xxxxxxxxxx> |  
| Subject: | [Xen-devel] Re: [RFC PATCH 35/35] Add Xen virtual block device	driver. |  
| From: | Christoph Hellwig <hch@xxxxxxxxxxxxx> |  
| Date: | Wed, 22 Mar 2006 16:54:44 +0000 |  
| Cc: | Chris Wright <chrisw@xxxxxxxxxxxx>, virtualization@xxxxxxxxxxxxxx,	xen-devel@xxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx,	Ian Pratt <ian.pratt@xxxxxxxxxxxxx> |  
| Delivery-date: | Thu, 23 Mar 2006 17:44:04 +0000 |  
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| Mail-followup-to: | Christoph Hellwig <hch@xxxxxxxxxxxxx>,	Anthony Liguori <aliguori@xxxxxxxxxx>,	Chris Wright <chrisw@xxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx,	virtualization@xxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxx,	Ian Pratt <ian.pratt@xxxxxxxxxxxxx> |  
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| User-agent: | Mutt/1.4.2.1i |  
| On Wed, Mar 22, 2006 at 10:39:25AM -0600, Anthony Liguori wrote:
> This is another thing that has always put me off.  The virtual block 
> device driver has the ability to masquerade as other types of block 
> devices.  It actually claims to be an IDE or SCSI device allocating the 
> appropriate major/minor numbers.
> 
> This seems to be pretty evil and creating interesting failure conditions 
> for users who load IDE or SCSI modules.  I've seen it trip up a number 
> of people in the past.  I think we should only ever use the major number 
> that was actually allocated to us.
Exactly.  We vetoed crap like that in the ibm vio drivers already so
it was removed before merging those drivers.
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