Re: [Qemu-devel] [PATCH v2 5/5] block: add header update capability for VHDX images.

[Jeff Cody <jcody@redhat.com>]

On Wed, Apr 24, 2013 at 04:47:15PM +0200, Stefan Hajnoczi wrote:
> On Tue, Apr 23, 2013 at 10:24:24AM -0400, Jeff Cody wrote:
> > This adds the ability to update the headers in a VHDX image, including
> > generating a new MS-compatible GUID.
> > 
> > As VHDX depends on uuid.h, VHDX is now a configurable build option.
> > If VHDX support is enabled, that will also enable uuid as well.
> > 
> > To enable/disable VHDX:  --enable-vhdx, --disable-vhdx
> > 
> > Signed-off-by: Jeff Cody <jcody@redhat.com>
> > ---
> >  block/Makefile.objs |   2 +-
> >  block/vhdx.c        | 157 +++++++++++++++++++++++++++++++++++++++++++++++++++-
> >  configure           |  13 +++++
> >  3 files changed, 169 insertions(+), 3 deletions(-)
> 
> Why is this part of the series?
> 
> Stefan

This could technically be dropped from the series, since the current
series only supports r/o functions.   

I included it because it is not log-dependent - This patch provides
the basic mechanism to update the headers (header updates do not go
through the log), so it is safe. It is not required yet, but it will
be in the future.