EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT
(1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT)
(test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
ret = ext4_test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT,