ncl_bioread
int ncl_bioread(struct vnode *, struct uio *, int, struct ucred *);
return (ncl_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred));
return (ncl_bioread(vp, ap->a_uio, 0, ap->a_cred));
error = ncl_bioread(vp, uio, 0, ap->a_cred);