FS_READ
err = FS_READ(nof->f.f_ops)(&nof->f, buf, size, NULL);
err = FS_READ(f.f_ops)
while (FS_READ(f.f_ops)(&f, dirbuf, UFS_DIRBLKSIZ, &resid) == 0 &&
if ((errno = FS_READ(f->f_ops)(f, dest, bcount, &resid)))