Re: [Qemu-devel] [RFC] Replication agent design (was [RFC PATCH] replication agent module)

[Paolo Bonzini]

On 02/19/2012 02:40 PM, Ori Mamluk wrote:
> 
> I think it might be better to go back to my original less generic design.
> We can regard it as a 'plugin' for a specific application - in this
> case, replication.
> I can add a plugin interface in the generic block layer that allows
> building a proper storage stack.
> The plugin will have capabilities like a filter driver - getting hold of
> the request on its way down (from VM to storage) and on its way up (IO
> completion), allowing to block or stall both.

I and Stefan talked about this recently... we called it a BlockListener.
 It seems like a good idea, and probably copy-on-read should be
converted in due to time to a BlockListener, too.

Paolo