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- Fixed checking for a FAT file system on a removable media.

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- Check more exactly for a FAT file system.

svn path=/trunk/; revision=9285
This commit is contained in:
Hartmut Birr 2004-05-02 20:16:46 +00:00
parent 38ed29a671
commit 7450b416e4
2 changed files with 99 additions and 44 deletions
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133
reactos/drivers/fs/vfat/fsctl.c
View file

@ -16,7 +16,7 @@
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/* $Id: fsctl.c,v 1.29 2004/03/31 03:30:36 jimtabor Exp $
/* $Id: fsctl.c,v 1.30 2004/05/02 20:16:45 hbirr Exp $
*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS kernel
@ -55,6 +55,9 @@ VfatHasFileSystem(PDEVICE_OBJECT DeviceToMount,
ULONG Sectors;
LARGE_INTEGER Offset;
struct _BootSector* Boot;
BOOL PartitionInfoIsValid = FALSE;
DPRINT("VfatHasFileSystem\n");
*RecognizedFS = FALSE;
@ -66,15 +69,12 @@ VfatHasFileSystem(PDEVICE_OBJECT DeviceToMount,
&DiskGeometry,
&Size,
FALSE);
DPRINT("VfatHasFileSystem start\n");
if (!NT_SUCCESS(Status))
{
DPRINT("VfatBlockDeviceIoControl faild (%x)\n", Status);
return Status;
}
if (DiskGeometry.MediaType == FixedMedia || RemovableMedia)
if (DiskGeometry.MediaType == FixedMedia || DiskGeometry.MediaType == RemovableMedia)
{
// We have found a hard disk
Size = sizeof(PARTITION_INFORMATION);
@ -90,7 +90,8 @@ VfatHasFileSystem(PDEVICE_OBJECT DeviceToMount,
DPRINT("VfatBlockDeviceIoControl faild (%x)\n", Status);
return Status;
}
/*#ifndef NDEBUG*/
PartitionInfoIsValid = TRUE;
#if defined(DBG) && !defined(NDEBUG)
DbgPrint("Partition Information:\n");
DbgPrint("StartingOffset %u\n", PartitionInfo.StartingOffset.QuadPart / 512);
DbgPrint("PartitionLength %u\n", PartitionInfo.PartitionLength.QuadPart / 512);
@ -100,18 +101,29 @@ VfatHasFileSystem(PDEVICE_OBJECT DeviceToMount,
DbgPrint("BootIndicator %u\n", PartitionInfo.BootIndicator);
DbgPrint("RecognizedPartition %u\n", PartitionInfo.RecognizedPartition);
DbgPrint("RewritePartition %u\n", PartitionInfo.RewritePartition);
/*#endif*/
if (PartitionInfo.PartitionType == PARTITION_FAT_12 ||
PartitionInfo.PartitionType == PARTITION_FAT_16 ||
PartitionInfo.PartitionType == PARTITION_HUGE ||
PartitionInfo.PartitionType == PARTITION_FAT32 ||
PartitionInfo.PartitionType == PARTITION_FAT32_XINT13 ||
PartitionInfo.PartitionType == PARTITION_XINT13)
#endif
if (PartitionInfo.PartitionType)
{
if (PartitionInfo.PartitionType == PARTITION_FAT_12 ||
PartitionInfo.PartitionType == PARTITION_FAT_16 ||
PartitionInfo.PartitionType == PARTITION_HUGE ||
PartitionInfo.PartitionType == PARTITION_FAT32 ||
PartitionInfo.PartitionType == PARTITION_FAT32_XINT13 ||
PartitionInfo.PartitionType == PARTITION_XINT13)
{
*RecognizedFS = TRUE;
}
}
else if (DiskGeometry.MediaType == RemovableMedia &&
PartitionInfo.PartitionNumber > 0 &&
PartitionInfo.StartingOffset.QuadPart == 0LL &&
PartitionInfo.PartitionLength.QuadPart > 0LL)
{
/* This is possible a removable media formated as super floppy */
*RecognizedFS = TRUE;
}
}
else if (DiskGeometry.MediaType > Unknown && DiskGeometry.MediaType <= RemovableMedia )
if (DiskGeometry.MediaType > Unknown && DiskGeometry.MediaType < RemovableMedia )
{
*RecognizedFS = TRUE;
}
@ -123,8 +135,6 @@ VfatHasFileSystem(PDEVICE_OBJECT DeviceToMount,
Boot = ExAllocatePool(NonPagedPool, DiskGeometry.BytesPerSector);
if (Boot == NULL)
{
DPRINT("VfatHasFileSystem 1\n");
*RecognizedFS=FALSE;
return STATUS_INSUFFICIENT_RESOURCES;
}
@ -134,9 +144,66 @@ VfatHasFileSystem(PDEVICE_OBJECT DeviceToMount,
Status = VfatReadDisk(DeviceToMount, &Offset, DiskGeometry.BytesPerSector, (PUCHAR) Boot, FALSE);
if (NT_SUCCESS(Status))
{
DPRINT("VfatHasFileSystem 2\n");
if (Boot->Signatur1 != 0xaa55)
{
DPRINT1("Signature %04x\n", Boot->Signatur1);
*RecognizedFS=FALSE;
}
if (*RecognizedFS &&
Boot->BytesPerSector != 512 &&
Boot->BytesPerSector != 1024 &&
Boot->BytesPerSector != 2048 &&
Boot->BytesPerSector == 4096)
{
DPRINT1("BytesPerSector %d\n", Boot->BytesPerSector);
*RecognizedFS=FALSE;
}
if (Boot->BytesPerSector != 0)
if (*RecognizedFS &&
Boot->FATCount != 1 &&
Boot->FATCount != 2)
{
DPRINT1("FATCount %d\n", Boot->FATCount);
*RecognizedFS=FALSE;
}
if (*RecognizedFS &&
Boot->Media != 0xf0 &&
Boot->Media != 0xf8 &&
Boot->Media != 0xf9 &&
Boot->Media != 0xfa &&
Boot->Media != 0xfb &&
Boot->Media != 0xfc &&
Boot->Media != 0xfd &&
Boot->Media != 0xfe &&
Boot->Media != 0xff)
{
DPRINT1("Media %02x\n", Boot->Media);
*RecognizedFS=FALSE;
}
if (*RecognizedFS &&
Boot->SectorsPerCluster != 1 &&
Boot->SectorsPerCluster != 2 &&
Boot->SectorsPerCluster != 4 &&
Boot->SectorsPerCluster != 8 &&
Boot->SectorsPerCluster != 16 &&
Boot->SectorsPerCluster != 32 &&
Boot->SectorsPerCluster != 64 &&
Boot->SectorsPerCluster != 128)
{
DPRINT1("SectorsPerCluster %02x\n", Boot->SectorsPerCluster);
*RecognizedFS=FALSE;
}
if (*RecognizedFS &&
Boot->BytesPerSector * Boot->SectorsPerCluster > 32 * 1024)
{
DPRINT1("ClusterSize %dx\n", Boot->BytesPerSector * Boot->SectorsPerCluster);
*RecognizedFS=FALSE;
}
if (*RecognizedFS)
{
FatInfo.VolumeID = Boot->VolumeID;
FatInfo.FATStart = Boot->ReservedSectors;
@ -169,21 +236,22 @@ VfatHasFileSystem(PDEVICE_OBJECT DeviceToMount,
DPRINT("FAT16\n");
FatInfo.FatType = FAT16;
}
if (pFatInfo)
if (PartitionInfoIsValid &&
FatInfo.Sectors > PartitionInfo.PartitionLength.QuadPart / FatInfo.BytesPerSector)
{
CHECKPOINT1;
*RecognizedFS = FALSE;
}
if (pFatInfo && *RecognizedFS)
{
*pFatInfo = FatInfo;
}
}
else
{
DPRINT("VfatHasFileSystem 3\n");
Status = STATUS_INSUFFICIENT_RESOURCES;
}
}
DPRINT("VfatHasFileSystem end\n");
ExFreePool(Boot);
DPRINT("VfatHasFileSystem done\n");
return Status;
}
@ -206,19 +274,6 @@ VfatMountDevice(PDEVICE_EXTENSION DeviceExt,
}
DPRINT("MountVfatdev %d, PAGE_SIZE = %d\n", DeviceExt->FatInfo.BytesPerCluster, PAGE_SIZE);
if (DeviceExt->FatInfo.BytesPerCluster >= PAGE_SIZE &&
(DeviceExt->FatInfo.BytesPerCluster % PAGE_SIZE) != 0)
{
DbgPrint("(%s:%d) Invalid cluster size\n", __FILE__, __LINE__);
KEBUGCHECK(0);
}
else if (DeviceExt->FatInfo.BytesPerCluster < PAGE_SIZE &&
(PAGE_SIZE % DeviceExt->FatInfo.BytesPerCluster) != 0)
{
DbgPrint("(%s:%d) Invalid cluster size2\n", __FILE__, __LINE__);
KEBUGCHECK(0);
}
return(STATUS_SUCCESS);
}

10
reactos/drivers/fs/vfat/vfat.h
View file

@ -1,4 +1,4 @@
/* $Id: vfat.h,v 1.61 2003/11/12 15:26:44 ekohl Exp $ */
/* $Id: vfat.h,v 1.62 2004/05/02 20:16:46 hbirr Exp $ */
#include <ddk/ntifs.h>
@ -20,8 +20,8 @@ struct _BootSector
unsigned char Drive, Res1, Sig;
unsigned long VolumeID;
unsigned char VolumeLabel[11], SysType[8];
unsigned char Res2[446];
unsigned long Signatur1;
unsigned char Res2[448];
unsigned short Signatur1;
} __attribute__((packed));
struct _BootSector32
@ -48,8 +48,8 @@ struct _BootSector32
unsigned char ExtBootSignature; // 66
unsigned long VolumeID; // 67
unsigned char VolumeLabel[11], SysType[8]; // 71
unsigned char Res2[418]; // 90
unsigned long Signature1; // 508
unsigned char Res2[420]; // 90
unsigned short Signature1; // 510
} __attribute__((packed));
struct _FsInfoSector