On 04/12/2013 02:47 PM, Kevin Wolf wrote: > Options starting in "backing." are passed to the backing file now. If > you don't need to specify the filename for the backing file, you can add > it on the command line instead of in the image file: > > $ qemu-nbd -t /tmp/test.img > $ qemu-img create -f qcow2 empty.qcow2 1G > $ qemu-system-x86_64 -drive file=empty.qcow2,backing.file.driver=nbd,\ > backing.file.host=localhost
So effectively empty.qcow2 is booted as though it had an explicit nbd://localhost in its backing metadata? Looks interesting! > > Note that this doesn't override the backing filename from the image. If > the image has one, this will fail because NBD doesn't want the options > and a filename at the same time. > > Signed-off-by: Kevin Wolf <kw...@redhat.com> > --- > block.c | 27 +++++++++++++++++++++++---- > block/mirror.c | 2 +- > include/block/block.h | 2 +- > 3 files changed, 25 insertions(+), 6 deletions(-) Reviewed-by: Eric Blake <ebl...@redhat.com> -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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