def create(self, name, volume, description=None, force=False):
        """
        Adds exception handling to the default create() call.
        """
        try:
            snap = super(CloudBlockStorageSnapshotManager, self).create(
                    name=name, volume=volume, description=description,
                    force=force)
        except exc.BadRequest as e:
            msg = str(e)
            if "Invalid volume: must be available" in msg:
                # The volume for the snapshot was attached.
                raise exc.VolumeNotAvailable("Cannot create a snapshot from an "
                        "attached volume. Detach the volume before trying "
                        "again, or pass 'force=True' to the create_snapshot() "
                        "call.")
            else:
                # Some other error
                raise
        except exc.ClientException as e:
            if e.code == 409:
                if "Request conflicts with in-progress" in str(e):
                    txt = ("The volume is current creating a snapshot. You "
                            "must wait until that completes before attempting "
                            "to create an additional snapshot.")
                    raise exc.VolumeNotAvailable(txt)
                else:
                    raise
            else:
                raise
        return snap
Adds exception handling to the default create() call.