ext2_clusteracct
ext2_clusteracct(fs, bbp, cg, bno, -1);
ext2_clusteracct(fs, bbp, cg, bno + i, -1);
ext2_clusteracct(fs, bbp, cg, bno, 1);
void ext2_clusteracct(struct m_ext2fs *, char *, int, e4fs_daddr_t, int);