markInUse
(void) markInUse(fd, c, ndp, NULL, 0, VISIBLE, NULL);
(void) markInUse(fd, clusterNum, dp, NULL, 0, VISIBLE, NULL);
(void) markInUse(fd, c, &BlankPCDIR, NULL, 0, VISIBLE,
(void) markInUse(fd, c, ndp, NULL, 0, VISIBLE, &tmpl);
if ((markInUse(fd, chain, dp, lp, longEntryStartCluster,
extern int markInUse(int fd, int32_t clusterNum, struct pcdir *referencer,