lfs_fcntl_markv_70
#define LFCNBMAPV_COMPAT_70 _FCNRW_FSPRIV('L', 2, struct lfs_fcntl_markv_70)
#define LFCNMARKV_COMPAT_70 _FCNRW_FSPRIV('L', 3, struct lfs_fcntl_markv_70)
struct lfs_fcntl_markv_70 blkvp70;
blkvp70 = *(struct lfs_fcntl_markv_70 *)ap->a_data;