smbfs_readvnode
int smbfs_readvnode(struct vnode *vp, struct uio *uiop, struct ucred *cred, int *eofp);
return smbfs_readvnode(vp, uio, ap->a_cred, NULL);
return (smbfs_readvnode(vp, uio, ap->a_cred, ap->a_eofflag));