tarfs_fid
struct tarfs_fid *tfp;
tfp = (struct tarfs_fid *)fhp;
struct tarfs_fid *tfp;
_Static_assert(sizeof(struct tarfs_fid) <= sizeof(struct fid),
tfp = (struct tarfs_fid *)ap->a_fhp;
tfp->len = sizeof(struct tarfs_fid);