vacl_get_acl
error = vacl_get_acl(vp, uap->type, uap->aclp);
error = vacl_get_acl((struct vnode *)fp->f_data, uap->type, uap->aclp);
static int vacl_get_acl(struct vnode *vp, acl_type_t type, struct acl *aclp);