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The code only converts from bpbHugeSectors to bpbSectors if the sum of

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the hidden and huge sectors is less than or equal MAXU16. When
formatting in Windows bpbSectors is still used for 63488 sectors and
2048 hidden (sum > MAXU16). The hidden sectors count is the number of
sectors before the FAT16 Boot Record so it shouldn't affect the sector
count. Attached patch (huge_sec_conversion.patch) to only check for
bpb.bpbHugeSectors <= MAXU16 when converting to bpbSectors.

Submitted by: Guy Yur
PR: 183234
This commit is contained in:
Warner Losh 2016-08-30 18:01:26 +00:00
parent 4a9fb9fb80
commit bf0d940a2f
1 changed files with 1 additions and 1 deletions
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2
sbin/newfs_msdos/mkfs_msdos.c
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@ -556,7 +556,7 @@ mkfs_msdos(const char *fname, const char *dtype, const struct msdos_options *op)
bpb.bpbMedia = !bpb.bpbHiddenSecs ? 0xf0 : 0xf8;
if (fat == 32)
bpb.bpbRootClust = RESFTE;
if (bpb.bpbHiddenSecs + bpb.bpbHugeSectors <= MAXU16) {
if (bpb.bpbHugeSectors <= MAXU16) {
bpb.bpbSectors = bpb.bpbHugeSectors;
bpb.bpbHugeSectors = 0;
}