Re: [Qemu-devel] [RFC PATCH 1/1] ceph/rbd block driver for qemu-kvm

[Avi Kivity]

On 05/24/2010 10:38 PM, Anthony Liguori wrote:
> > - Building a plugin API seems a bit simpler to me, although I'm to
> > sure if I'd get the
> >    idea correctly:
> >    The block layer has already some kind of api (.bdrv_file_open, 
> > .bdrv_read). We
> >    could simply compile the block-drivers as shared objects and 
> > create a method
> >    for loading the necessary modules at runtime.
>
> That approach would be a recipe for disaster.   We would have to 
> introduce a new, reduced functionality block API that was supported 
> for plugins.  Otherwise, the only way a plugin could keep up with our 
> API changes would be if it was in tree which defeats the purpose of 
> having plugins.

We could guarantee API/ABI stability in a stable branch but not across 
releases.

--
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