api.py 文件源码

def instance_for_device(image, mountdir, partition, device):
        """Get a Mount instance for the device type

        :param image: instance of nova.virt.image.model.Image
        :param mountdir: path to mount the image at
        :param partition: partition number to mount
        :param device: mounted device path
        """

        LOG.debug("Instance for device image=%(image)s "
                  "mountdir=%(mountdir)s partition=%(partition)s "
                  "device=%(device)s",
                  {'image': image, 'mountdir': mountdir,
                   'partition': partition, 'device': device})

        if "loop" in device:
            LOG.debug("Using LoopMount")
            return importutils.import_object(
                "nova.virt.disk.mount.loop.LoopMount",
                image, mountdir, partition, device)
        elif "nbd" in device:
            LOG.debug("Using NbdMount")
            return importutils.import_object(
                "nova.virt.disk.mount.nbd.NbdMount",
                image, mountdir, partition, device)
        else:
            LOG.debug("Using BlockMount")
            return importutils.import_object(
                "nova.virt.disk.mount.block.BlockMount",
                image, mountdir, partition, device)