- nbits = ((fs->super->s_blocks_count
- - fs->super->s_first_data_block)
- % EXT2_BLOCKS_PER_GROUP(fs->super));
+ nbits = EXT2FS_NUM_B2C(fs,
+ ((ext2fs_blocks_count(fs->super)
+ - (__u64) fs->super->s_first_data_block)
+ % (__u64) EXT2_BLOCKS_PER_GROUP(fs->super)));