ext2_cg_has_sb
if (!ext2_cg_has_sb(fs, cg))
number = ext2_cg_has_sb(fs, cg);
int ext2_cg_has_sb(struct m_ext2fs *fs, int cg);
if (ext2_cg_has_sb(fs, i))
if (ext2_cg_has_sb(fs, cg))