168 	struct bootblock	*boot;  member
523 	return (fat->boot);  in boot_of_()
557 	const struct bootblock *boot = boot_of_(fat);  in valid_cl()  local
559 	return (cl >= CLUST_FIRST && cl < boot->NumClusters);  in valid_cl()
580 checkdirty(int fs, struct bootblock *boot)  in checkdirty()  argument
587 	if (boot->ClustMask != CLUST16_MASK && boot->ClustMask != CLUST32_MASK)  in checkdirty()
590 	off = boot->bpbResSectors;  in checkdirty()
591 	off *= boot->bpbBytesPerSec;  in checkdirty()
593 	buffer = malloc(len = boot->bpbBytesPerSec);  in checkdirty()
604 	if ((size_t)read(fs, buffer, boot->bpbBytesPerSec) !=  in checkdirty()
605 	    boot->bpbBytesPerSec) {  in checkdirty()
614 	if (buffer[0] != boot->bpbMedia || buffer[1] != 0xff)  in checkdirty()
616 	if (boot->ClustMask == CLUST16_MASK) {  in checkdirty()
629 	if (boot->ClustMask == CLUST16_MASK) {  in checkdirty()
646 	struct bootblock *boot;  in cleardirty()  local
651 	boot = boot_of_(fat);  in cleardirty()
654 	if (boot->ClustMask != CLUST16_MASK && boot->ClustMask != CLUST32_MASK)  in cleardirty()
657 	off = boot->bpbResSectors;  in cleardirty()
658 	off *= boot->bpbBytesPerSec;  in cleardirty()
660 	buffer = malloc(len = boot->bpbBytesPerSec);  in cleardirty()
671 	if (boot->ClustMask == CLUST16_MASK) {  in cleardirty()
699 	struct bootblock *boot;  in _readfat()  local
702 	boot = boot_of_(fat);  in _readfat()
704 	fat->fatsize = boot->FATsecs * boot->bpbBytesPerSec;  in _readfat()
706 	off = boot->bpbResSectors;  in _readfat()
707 	off *= boot->bpbBytesPerSec;  in _readfat()
732 	if (boot->ClustMask == CLUST32_MASK &&  in _readfat()
737 		fat->fat32_offset = boot->bpbResSectors * boot->bpbBytesPerSec;  in _readfat()
806 readfat(int fs, struct bootblock *boot, struct fat_descriptor **fp)  in readfat()  argument
813 	boot->NumFree = boot->NumBad = 0;  in readfat()
822 	fat->boot = boot;  in readfat()
831 	switch(boot->ClustMask) {  in readfat()
850 		pfatal("Invalid ClustMask: %d", boot->ClustMask);  in readfat()
856 	if (bitmap_ctor(&fat->headbitmap, boot->NumClusters,  in readfat()
859 		    (size_t)boot->NumClusters);  in readfat()
865 	if (buffer[0] != boot->bpbMedia  in readfat()
867 	    || (boot->ClustMask == CLUST16_MASK && buffer[3] != 0xff)  in readfat()
868 	    || (boot->ClustMask == CLUST32_MASK  in readfat()
875 		 * 0xXXffff0fffffff07 for FAT32 upon boot, to know that the  in readfat()
879 		if (buffer[0] == boot->bpbMedia && buffer[1] == 0xff  in readfat()
881 		    && ((boot->ClustMask == CLUST16_MASK && buffer[3] == 0x7f)  in readfat()
882 			|| (boot->ClustMask == CLUST32_MASK  in readfat()
890 			switch (boot->ClustMask) {  in readfat()
913 				*p++ = (u_char)boot->bpbMedia;  in readfat()
916 				switch (boot->ClustMask) {  in readfat()
964 	for (cl = CLUST_FIRST; cl < boot->NumClusters; cl++) {  in readfat()
970 			if (boot->FSNext == 0) {  in readfat()
971 				boot->FSNext = cl;  in readfat()
976 			boot->NumFree++;  in readfat()
981 			boot->NumBad++;  in readfat()
986 			    nextcl & boot->ClustMask);  in readfat()
1123 	struct bootblock *boot = boot_of_(fat);  in clearchain()  local
1130 		boot->NumFree++;  in clearchain()
1144 	struct bootblock *boot;  in copyfat()  local
1149 	boot = boot_of_(fat);  in copyfat()
1159 	dst_off = boot->bpbResSectors + n * boot->FATsecs;  in copyfat()
1160 	dst_off *= boot->bpbBytesPerSec;  in copyfat()
1194 	struct bootblock *boot;  in writefat()  local
1197 	boot = boot_of_(fat);  in writefat()
1219 		for (i = 1; i < boot->bpbFATs; i++) {  in writefat()
1226 		for (i = fat->is_mmapped ? 1 : 0; i < boot->bpbFATs; i++) {  in writefat()
1227 			dst_base = boot->bpbResSectors + i * boot->FATsecs;  in writefat()
1228 			dst_base *= boot->bpbBytesPerSec;  in writefat()
1251 	struct bootblock *boot;  in checklost()  local
1254 	boot = boot_of_(fat);  in checklost()
1263 	    chains > 0 && head < boot->NumClusters;  in checklost()
1296 	if (boot->bpbFSInfo) {  in checklost()
1298 		if (boot->FSFree != 0xffffffffU &&  in checklost()
1299 		    boot->FSFree != boot->NumFree) {  in checklost()
1301 			      boot->FSFree, boot->NumFree);  in checklost()
1303 				boot->FSFree = boot->NumFree;  in checklost()
1307 		if (boot->FSNext != 0xffffffffU &&  in checklost()
1308 		    (boot->FSNext >= boot->NumClusters ||  in checklost()
1309 		    (boot->NumFree && fat_get_cl_next(fat, boot->FSNext) != CLUST_FREE))) {  in checklost()
1311 			      boot->FSNext,  in checklost()
1312 			      (boot->FSNext >= boot->NumClusters) ? "invalid" : "not free");  in checklost()
1314 				for (head = CLUST_FIRST; head < boot->NumClusters; head++)  in checklost()
1316 						boot->FSNext = head;  in checklost()
1322 			mod |= writefsinfo(dosfs, boot);  in checklost()