• Kevin Wolf's avatar
    block: Add driver-specific options for backing files · 31ca6d07
    Kevin Wolf authored
    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,\
    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: default avatarKevin Wolf <kwolf@redhat.com>
    Reviewed-by: default avatarEric Blake <eblake@redhat.com>