dm_dev             16 include/linux/device-mapper.h struct dm_dev;
dm_dev             93 include/linux/device-mapper.h 					   struct dm_dev *dev,
dm_dev            129 include/linux/device-mapper.h 		  struct dm_dev **result);
dm_dev            130 include/linux/device-mapper.h void dm_put_device(struct dm_target *ti, struct dm_dev *d);