On 02/29/2012 06:37 AM, Paolo Bonzini wrote: > From: Marcelo Tosatti <mtosa...@redhat.com> > > Mirrored writes are used by live block copy. > > The blkmirror driver is for internal use only, because it requires > bdrv_append to set up a backing_hd for it. It relies on a quirk > of bdrv_append, which leaves the old image open for writes. > > The source is hardcoded as the backing_hd for the destination, so that > copy-on-write functions properly. Since the source is not yet available > at the time blkmirror_open is called, the backing_hd is set later. >
> +++ b/block/blkmirror.c > @@ -0,0 +1,153 @@ > +/* > + * Block driver for mirrored writes. > + * > + * Copyright (C) 2011 Red Hat, Inc. It's now 2012; should this be expanded? -- Eric Blake ebl...@redhat.com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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