Re: [Xen-devel][PATCH]: Support dynamic resizing of vbds

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

On 03/11/2010 02:01 PM, Ky Srinivasan wrote:
>    
> > > > On 3/11/2010 at  4:44 PM, in message<4B996436.1000600@xxxxxxxx>, Jeremy
> > > >          
> Fitzhardinge<jeremy@xxxxxxxx>  wrote:
>    
> > On 03/11/2010 12:15 PM, Pasi KÃrkkÃinen wrote:
> >      
> > > On Tue, Mar 09, 2010 at 01:39:23PM -0700, Ky Srinivasan wrote:
> > >
> > >        
> > > >          
> > > > > > > On 3/9/2010 at  3:35 PM, in message<20100309203557.GJ1878@xxxxxxxxxxx>, Pasi
> > > > > > >
> > > > > > >                
> > > > KÃrkkÃinen<pasik@xxxxxx>   wrote:
> > > >
> > > >          
> > > > > On Tue, Mar 09, 2010 at 01:31:17PM -0700, Ky Srinivasan wrote:
> > > > >
> > > > >            
> > > > > >              
> > > > > > > > > On 3/9/2010 at  3:15 PM, in message<20100309201529.GH1878@xxxxxxxxxxx>, Pasi
> > > > > > > > >
> > > > > > > > >                    
> > > > > > KÃrkkÃinen<pasik@xxxxxx>   wrote:
> > > > > >
> > > > > >              
> > > > > > > On Tue, Mar 09, 2010 at 12:56:11PM -0700, Ky Srinivasan wrote:
> > > > > > >
> > > > > > >                
> > > > > > > > The attached patch supports dynamic resizing of vbds.
> > > > > > > >
> > > > > > > >
> > > > > > > >                  
> > > > > > > Nice! Did you also implement the xm/xend side of resizing?
> > > > > > >
> > > > > > >                
> > > > > > My goal was to not have the end-user do anything other than what
> > > > > > was minimally required to  resizing the device on the host side.
> > > > > > Once the device is resized on the host side, this capacity change
> > > > > > is propagated to the guest without having to invoke any xm command.
> > > > > >
> > > > > >
> > > > > >              
> > > > > Oh, even better!
> > > > > What version of the kernel did you test with? 2.6.27?
> > > > >
> > > > >            
> > > > I tested this on 2.6.32. The patches should apply to earlier kernels without
> > > >          
> > too much trouble.
> >      
> > > >          
> > > Great!
> > >
> > > Jeremy: Hopefully you can add this patch to your tree.
> > >
> > >        
> > It applied fairly cleanly, but I haven't tested it yet.  Ky, by 2.6.32 I
> > assume I mean your one, not pvops? (Because your patch is touching
> > blkfront in the wrong place.)
> >      
> Yes. This patch was against our sles11 sp1.
>    
What happens if the frontend doesn't support the resize, and the device 
shrinks?  Will the backend just raise IO errors for out of range requests?
    J

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