iucv_array
headroom = sizeof(struct iucv_array) *
struct iucv_array *iba = (struct iucv_array *)skb->head;
headroom = sizeof(struct iucv_array) * (MAX_SKB_FRAGS + 1);
struct iucv_array *iba = (struct iucv_array *)skb->head;
struct iucv_array *array;