dosetattr
error = dosetattr(ap->a_vp, ap->a_vap, ap->a_cred, SETATTR_CHSIZE);
error = dosetattr(vp, &va, FSCRED,
ret = dosetattr(vp, &va, FSCRED, 0);
error = dosetattr(vp, &va, FSCRED, 0);