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* Added trailing fs info sector signature

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* Calculate correct cluster size

svn path=/trunk/; revision=5677
This commit is contained in:
Eric Kohl 2003-08-19 19:15:20 +00:00
parent 57a76c0f45
commit cb15da56e1
2 changed files with 39 additions and 12 deletions
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32
reactos/lib/fslib/vfatlib/vfatlib.c
View file

@ -134,6 +134,7 @@ VfatWriteFsInfo(IN HANDLE FileHandle,
FsInfo->StrucSig = 0x61417272;
FsInfo->FreeCount = 0xffffffff;
FsInfo->NextFree = 0xffffffff;
FsInfo->TrailSig = 0xaa550000;
/* Write sector */
FileOffset.QuadPart = BootSector->FSInfoSector * BootSector->BytesPerSector;
@ -194,7 +195,7 @@ VfatWriteFAT(IN HANDLE FileHandle,
Buffer[4] = 0xff; /* Clean shutdown, no disk read/write errors, end-of-cluster (EOC) mark */
Buffer[5] = 0xff;
Buffer[6] = 0xff;
Buffer[7] = 0x0f;
Buffer[7] = 0x0f;
/* FAT cluster 2 */
Buffer[8] = 0xff; /* End of root directory */
Buffer[9] = 0xff;
@ -425,10 +426,35 @@ VfatFormat(
return Status;
}
/* Calculate cluster size */
if (ClusterSize == 0)
{
if (PartitionInfo.PartitionLength.QuadPart < 8ULL * 1024ULL * 1024ULL)
{
/* Partition < 8GB ==> 4KB Cluster */
ClusterSize = 4096;
}
else if (PartitionInfo.PartitionLength.QuadPart < 16ULL * 1024ULL * 1024ULL)
{
/* Partition 8GB - 16GB ==> 8KB Cluster */
ClusterSize = 8192;
}
else if (PartitionInfo.PartitionLength.QuadPart < 32ULL * 1024ULL * 1024ULL)
{
/* Partition 16GB - 32GB ==> 16KB Cluster */
ClusterSize = 16384;
}
else
{
/* Partition >= 32GB ==> 32KB Cluster */
ClusterSize = 32768;
}
}
memset(&BootSector, 0, sizeof(FAT32_BOOT_SECTOR));
memcpy(&BootSector.OEMName[0], "MSWIN4.1", 8);
BootSector.BytesPerSector = DiskGeometry.BytesPerSector;
BootSector.SectorsPerCluster = 4096 / BootSector.BytesPerSector; // 4KB clusters /* FIXME: */
BootSector.SectorsPerCluster = ClusterSize / BootSector.BytesPerSector;
BootSector.ReservedSectors = 32;
BootSector.FATCount = 2;
BootSector.RootEntries = 0;
@ -437,7 +463,7 @@ VfatFormat(
BootSector.FATSectors = 0;
BootSector.SectorsPerTrack = DiskGeometry.SectorsPerTrack;
BootSector.Heads = DiskGeometry.TracksPerCylinder;
BootSector.HiddenSectors = PartitionInfo.HiddenSectors;
BootSector.HiddenSectors = DiskGeometry.SectorsPerTrack; //PartitionInfo.HiddenSectors;
BootSector.SectorsHuge = PartitionInfo.PartitionLength.QuadPart >>
GetShiftCount(BootSector.BytesPerSector); /* Use shifting to avoid 64-bit division */
BootSector.FATSectors32 = 0; /* Set later */

19
reactos/lib/fslib/vfatlib/vfatlib.h
View file

@ -26,9 +26,9 @@ typedef struct _FAT32_BOOT_SECTOR
unsigned char Media; // 21
unsigned short FATSectors; // 22
unsigned short SectorsPerTrack; // 24
unsigned short Heads; // 22
unsigned long HiddenSectors; // 24
unsigned long SectorsHuge; // 28
unsigned short Heads; // 26
unsigned long HiddenSectors; // 28
unsigned long SectorsHuge; // 32
unsigned long FATSectors32; // 36
unsigned short ExtFlag; // 40
unsigned short FSVersion; // 42
@ -48,10 +48,11 @@ typedef struct _FAT32_BOOT_SECTOR
typedef struct _FAT32_FSINFO
{
unsigned int LeadSig; // 0
unsigned char Res1[480]; // 4
unsigned int StrucSig; // 484
unsigned int FreeCount; // 488
unsigned int NextFree; // 492
unsigned int Res2; // 496
unsigned long LeadSig; // 0
unsigned char Res1[480]; // 4
unsigned long StrucSig; // 484
unsigned long FreeCount; // 488
unsigned long NextFree; // 492
unsigned long Res2[3]; // 496
unsigned long TrailSig; // 508
} __attribute__((packed)) FAT32_FSINFO, *PFAT32_FSINFO;