dm_copy_name_and_uuid
r = dm_copy_name_and_uuid(md, *dev_name, *dev_uuid);
EXPORT_SYMBOL_GPL(dm_copy_name_and_uuid);
if (dm_copy_name_and_uuid(md, buf, NULL))
if (dm_copy_name_and_uuid(md, NULL, buf))
if (dm_copy_name_and_uuid(event->md, event->name,
int dm_copy_name_and_uuid(struct mapped_device *md, char *name, char *uuid);