GBF_FULL
clear_bit(GBF_FULL, &bi->bi_flags);
clear_bit(GBF_FULL, &bi->bi_flags);
set_bit(GBF_FULL, &bi->bi_flags);
if (test_bit(GBF_FULL, &bi->bi_flags) &&
set_bit(GBF_FULL, &bi->bi_flags);
test_bit(GBF_FULL, &rbm.rgd->rd_bits->bi_flags),