door_node
#define VTOD(v) ((struct door_node *)(v->v_data))
struct door_node *door_list; /* List of active doors in proc */
struct door_node *door_ulist; /* Unref list */
struct door_node *d_active; /* Active door */
struct door_node *d_pool; /* our server thread pool */
struct door_node *p_door_list; /* active doors */
struct door_node *p_unref_list;