fw_topology_map
#define FW_GTPMAP _IOR('S', 5, struct fw_topology_map)
struct fw_topology_map *topology_map;
fc->topology_map = (struct fw_topology_map *)malloc(
sizeof(struct fw_topology_map));
memset(fc->topology_map, 0, sizeof(struct fw_topology_map));
struct fw_topology_map *tmap;
tmap = malloc(sizeof(struct fw_topology_map));