Differential D26524 Diff 77400 head/sbin/fsck_msdosfs/dir.c

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head/sbin/fsck_msdosfs/dir.c

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	/*			/*
	* Check an in-memory file entry			* Check an in-memory file entry
	*/			*/
	static int			static int
	checksize(struct fat_descriptor fat, u_char p, struct dosDirEntry *dir)			checksize(struct fat_descriptor fat, u_char p, struct dosDirEntry *dir)
	{			{
	int ret = FSOK;			int ret = FSOK;
	size_t physicalSize;			size_t chainsize;
				u_int64_t physicalSize;
	struct bootblock *boot;			struct bootblock *boot;

	boot = fat_get_boot(fat);			boot = fat_get_boot(fat);

	/*			/*
	* Check size on ordinary files			* Check size on ordinary files
	*/			*/
	if (dir->head == CLUST_FREE) {			if (dir->head == CLUST_FREE) {
	physicalSize = 0;			physicalSize = 0;
	} else {			} else {
	if (!fat_is_valid_cl(fat, dir->head))			if (!fat_is_valid_cl(fat, dir->head))
	return FSERROR;			return FSERROR;
	ret = checkchain(fat, dir->head, &physicalSize);			ret = checkchain(fat, dir->head, &chainsize);
	/*			/*
	* Upon return, physicalSize would hold the chain length			* Upon return, chainsize would hold the chain length
	* that checkchain() was able to validate, but if the user			* that checkchain() was able to validate, but if the user
	* refused the proposed repair, it would be unsafe to			* refused the proposed repair, it would be unsafe to
	* proceed with directory entry fix, so bail out in that			* proceed with directory entry fix, so bail out in that
	* case.			* case.
	*/			*/
	if (ret == FSERROR) {			if (ret == FSERROR) {
	return (FSERROR);			return (FSERROR);
	}			}
	physicalSize *= boot->ClusterSize;			/*
				* The maximum file size on FAT32 is 4GiB - 1, which
				* will occupy a cluster chain of exactly 4GiB in
				* size. On 32-bit platforms, since size_t is 32-bit,
				* it would wrap back to 0.
				*/
				physicalSize = (u_int64_t)chainsize * boot->ClusterSize;
	}			}
	if (physicalSize < dir->size) {			if (physicalSize < dir->size) {
	pwarn("size of %s is %u, should at most be %zu\n",			pwarn("size of %s is %u, should at most be %zu\n",
	fullpath(dir), dir->size, physicalSize);			fullpath(dir), dir->size, physicalSize);
	if (ask(1, "Truncate")) {			if (ask(1, "Truncate")) {
	dir->size = physicalSize;			dir->size = physicalSize;
	p[28] = (u_char)physicalSize;			p[28] = (u_char)physicalSize;
	p[29] = (u_char)(physicalSize >> 8);			p[29] = (u_char)(physicalSize >> 8);
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