SMAPSZ
nwords = (bitno == 0) ? SMAPSZ : SMAPSZ + 1;
sword = (sword == SMAPSZ - 1) ? 0 : sword + 1;
if (sword >= SMAPSZ) {
if (sword >= SMAPSZ) {
for (i = 0; i < SMAPSZ; i++)
__le32 inosmap[SMAPSZ]; /* 16: sum map of mapwords w/ free inodes;
__le32 extsmap[SMAPSZ]; /* 16: sum map of mapwords w/ free extents */