On Wed, May 15, 2013 at 04:42:57PM +0200, Paolo Bonzini wrote: > Il 15/05/2013 16:34, Stefan Hajnoczi ha scritto: > > The bdrv_add_before_write_cb() function installs a callback that is > > invoked before a write request is processed. This will be used to > > implement copy-on-write point-in-time snapshots where we need to copy > > out old data before overwriting it. > > Perhaps a notifier list that receives the BdrvTrackedRequest? (BTW we > should probably remove all the notifier_remove wrappers, they're useless).
Nice idea, done in v4. I originally rejected NotifierList because it only has a void * argument, but BdrvRequest has the information we need.
