raid_internal
struct raid_internal *i = device_to_raid_internal(dev); \
struct raid_internal *i = kzalloc_obj(struct raid_internal);
struct raid_internal *i = to_raid_internal(r);
#define to_raid_internal(tmpl) container_of(tmpl, struct raid_internal, r)
struct raid_internal *i = ac_to_raid_internal(cont);