ck_sector
#define BBH_GETCK_SECTOR(X, ckp) ((ckp)->ck_sector)
ckp[0].ck_sector = GET_BP_SEC(bp);
if (ckp[idx].ck_sector > altp->bad_end)
if ((ckp[idx].ck_sector >= altp->bad_start) &&
ckp[idx].ck_sector = altp->good_start +
ckp[idx].ck_sector - altp->bad_start;
ckp[idx+1].ck_sector = altp->good_start;
if ((ckp[idx].ck_sector <= altp->bad_end) &&
(ckp[idx].ck_sector >= altp->bad_start)) {
ckp[idx].ck_sector + 1;
ckp[idx].ck_sector = altp->good_start +
ckp[idx].ck_sector - altp->bad_start;
ckp[idx].ck_sector = altp->bad_end + 1;
ckp[idx].ck_seclen = altp->bad_start - ckp[idx].ck_sector;
ckp[idx+1].ck_sector = altp->good_start;
ckp[idx].ck_sector = altp->bad_end + 1;