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[VFATLIB]

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Update the amount of FAT entries taking into account that the first two are reserved and thus not usable.

Patch by Wim Hueskes

CORE-11283 #resolve #comment Committed in r71370, thanks for your patch!

svn path=/trunk/; revision=71370
This commit is contained in:
Pierre Schweitzer 2016-05-22 07:56:45 +00:00
parent 3fa137bf9c
commit 02fde17b6f
1 changed files with 17 additions and 0 deletions
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17
reactos/sdk/lib/fslib/vfatlib/fat32.c
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@ -397,6 +397,9 @@ Fat32Format(IN HANDLE FileHandle,
ULONG TmpVal1;
ULONG TmpVal2;
NTSTATUS Status;
ULONG UsableFatEntries;
ULONG FirstDataSector;
ULONG DataClusters;
/* Calculate cluster size */
if (ClusterSize == 0)
@ -469,6 +472,20 @@ Fat32Format(IN HANDLE FileHandle,
BootSector.FATSectors32 = (TmpVal1 + (TmpVal2 - 1)) / TmpVal2;
DPRINT("FATSectors32 = %lu\n", BootSector.FATSectors32);
/* edge case: first 2 fat entries are not usable, so the calculation might need a correction */
UsableFatEntries = BootSector.FATSectors32 * (BootSector.BytesPerSector / 4) - 2;
FirstDataSector = BootSector.ReservedSectors + BootSector.FATCount * BootSector.FATSectors32;
DataClusters = (BootSector.SectorsHuge - FirstDataSector) / BootSector.SectorsPerCluster;
if (DataClusters > UsableFatEntries)
{
/* Need more fat entries */
BootSector.FATSectors32 += (DataClusters - UsableFatEntries);
DPRINT("UsableFatEntries = %lu\n", UsableFatEntries);
DPRINT("DataClusters = %lu\n", DataClusters);
DPRINT("BootSector.FATSectors32 incremented to %lu\n", BootSector.FATSectors32);
}
/* Init context data */
Context->TotalSectorCount =
2 + (BootSector.FATSectors32 * BootSector.FATCount) + BootSector.SectorsPerCluster;