420 clearchain(struct bootblock *boot, struct fatEntry *fat, cl_t head)  in clearchain()  argument
424 	for (p = head; p >= CLUST_FIRST && p < boot->NumClusters; p = q) {  in clearchain()
425 		if (fat[p].head != head)  in clearchain()
428 		fat[p].next = fat[p].head = CLUST_FREE;  in clearchain()
434 tryclear(struct bootblock *boot, struct fatEntry *fat, cl_t head, cl_t *trunc)  in tryclear()  argument
436 	if (ask(1, "Clear chain starting at %u", head)) {  in tryclear()
437 		clearchain(boot, fat, head);  in tryclear()
452 	cl_t head, p, h, n, wdk;  in checkfat()  local
460 	for (head = CLUST_FIRST; head < boot->NumClusters; head++) {  in checkfat()
462 		if (fat[head].head != 0		/* cluster already belongs to some chain */  in checkfat()
463 		    || fat[head].next == CLUST_FREE  in checkfat()
464 		    || fat[head].next == CLUST_BAD)  in checkfat()
468 		for (len = 0, p = head;  in checkfat()
473 					printf("detect cluster chain loop: head %u for p %u\n", head, p);  in checkfat()
477 			fat[p].head = head;  in checkfat()
482 		fat[head].length = fat[head].next == CLUST_FREE ? 0 : len;  in checkfat()
490 	for (head = CLUST_FIRST; head < boot->NumClusters; head++) {  in checkfat()
492 		if (fat[head].head != head)  in checkfat()
497 		for (p = head,wdk=boot->NumClusters;  in checkfat()
500 			if (fat[n].head != head)  in checkfat()
509 			      head, rsrvdcltype(n));  in checkfat()
510 			ret |= tryclear(boot, fat, head, &fat[p].next);  in checkfat()
515 			      head, n);  in checkfat()
516 			ret |= tryclear(boot, fat, head, &fat[p].next);  in checkfat()
520 		      head, fat[n].head, n);  in checkfat()
521 		conf = tryclear(boot, fat, head, &fat[p].next);  in checkfat()
522 		if (ask(1, "Clear chain starting at %u", h = fat[n].head)) {  in checkfat()
530 					if (h != fat[p].head) {  in checkfat()
534 						head--;  in checkfat()
537 					fat[p].head = head;  in checkfat()
663 	cl_t head;  in checklost()  local
667 	for (head = CLUST_FIRST; head < boot->NumClusters; head++) {  in checklost()
669 		if (fat[head].head != head  in checklost()
670 		    || fat[head].next == CLUST_FREE  in checklost()
671 		    || (fat[head].next >= CLUST_RSRVD  in checklost()
672 			&& fat[head].next < CLUST_EOFS)  in checklost()
673 		    || (fat[head].flags & FAT_USED))  in checklost()
677 		      head, fat[head].length);  in checklost()
678 		mod |= ret = reconnect(dosfs, boot, fat, head);  in checklost()
683 			clearchain(boot, fat, head);  in checklost()
688 			clearchain(boot, fat, head);  in checklost()
710 					for (head = CLUST_FIRST; head < boot->NumClusters; head++)  in checklost()
711 						if (fat[head].next == CLUST_FREE) {  in checklost()
712 							boot->FSNext = head;  in checklost()
729 				for (head = CLUST_FIRST; head < boot->NumClusters; head++)  in checklost()
730 					if (fat[head].next == CLUST_FREE) {  in checklost()
731 						boot->FSNext = head;  in checklost()