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Windows: Fix failure to format some disks (e.g. VHDX) caused by partition offset not 4K aligned

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Now we set offset to 1MB which is a typical values used for MBR disks.
We also use a more standard way to calculate legacy number of cylinders
This commit is contained in:
Mounir IDRASSI 2023-11-08 22:43:18 +01:00
parent e70aa13c5b
commit 1688779bc3
No known key found for this signature in database
GPG Key ID: FC1B00364B3FE937
2 changed files with 10 additions and 11 deletions
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18
src/Driver/Ntdriver.c
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@ -1033,8 +1033,8 @@ NTSTATUS ProcessVolumeDeviceControlIrp (PDEVICE_OBJECT DeviceObject, PEXTENSION
outputBuffer->Geometry.TracksPerCylinder = Extension->TracksPerCylinder;
outputBuffer->Geometry.SectorsPerTrack = Extension->SectorsPerTrack;
outputBuffer->Geometry.BytesPerSector = Extension->BytesPerSector;
/* add one sector to DiskLength since our partition size is DiskLength and its offset if BytesPerSector */
outputBuffer->DiskSize.QuadPart = Extension->DiskLength + Extension->BytesPerSector;
// Add 1MB to the disk size to emulate the geometry of a real MBR disk
outputBuffer->DiskSize.QuadPart = Extension->DiskLength + BYTES_PER_MB;
if (bFullBuffer)
{
@ -1305,7 +1305,7 @@ NTSTATUS ProcessVolumeDeviceControlIrp (PDEVICE_OBJECT DeviceObject, PEXTENSION
outputBuffer->BootIndicator = FALSE;
outputBuffer->RecognizedPartition = TRUE;
outputBuffer->RewritePartition = FALSE;
outputBuffer->StartingOffset.QuadPart = Extension->BytesPerSector;
outputBuffer->StartingOffset.QuadPart = BYTES_PER_MB; // Set offset to 1MB to emulate the partition offset on a real MBR disk
outputBuffer->PartitionLength.QuadPart= Extension->DiskLength;
outputBuffer->PartitionNumber = 1;
outputBuffer->HiddenSectors = 0;
@ -1322,7 +1322,7 @@ NTSTATUS ProcessVolumeDeviceControlIrp (PDEVICE_OBJECT DeviceObject, PEXTENSION
outputBuffer->PartitionStyle = PARTITION_STYLE_MBR;
outputBuffer->RewritePartition = FALSE;
outputBuffer->StartingOffset.QuadPart = Extension->BytesPerSector;
outputBuffer->StartingOffset.QuadPart = BYTES_PER_MB; // Set offset to 1MB to emulate the partition offset on a real MBR disk
outputBuffer->PartitionLength.QuadPart= Extension->DiskLength;
outputBuffer->PartitionNumber = 1;
outputBuffer->Mbr.PartitionType = Extension->PartitionType;
@ -1350,7 +1350,7 @@ NTSTATUS ProcessVolumeDeviceControlIrp (PDEVICE_OBJECT DeviceObject, PEXTENSION
outputBuffer->PartitionEntry->BootIndicator = FALSE;
outputBuffer->PartitionEntry->RecognizedPartition = TRUE;
outputBuffer->PartitionEntry->RewritePartition = FALSE;
outputBuffer->PartitionEntry->StartingOffset.QuadPart = Extension->BytesPerSector;
outputBuffer->PartitionEntry->StartingOffset.QuadPart = BYTES_PER_MB; // Set offset to 1MB to emulate the partition offset on a real MBR disk
outputBuffer->PartitionEntry->PartitionLength.QuadPart = Extension->DiskLength;
outputBuffer->PartitionEntry->PartitionNumber = 1;
outputBuffer->PartitionEntry->HiddenSectors = 0;
@ -1386,7 +1386,7 @@ NTSTATUS ProcessVolumeDeviceControlIrp (PDEVICE_OBJECT DeviceObject, PEXTENSION
outputBuffer->PartitionEntry->Mbr.BootIndicator = FALSE;
outputBuffer->PartitionEntry->Mbr.RecognizedPartition = TRUE;
outputBuffer->PartitionEntry->RewritePartition = FALSE;
outputBuffer->PartitionEntry->StartingOffset.QuadPart = Extension->BytesPerSector;
outputBuffer->PartitionEntry->StartingOffset.QuadPart = BYTES_PER_MB; // Set offset to 1MB to emulate the partition offset on a real MBR disk
outputBuffer->PartitionEntry->PartitionLength.QuadPart = Extension->DiskLength;
outputBuffer->PartitionEntry->PartitionNumber = 1;
outputBuffer->PartitionEntry->Mbr.HiddenSectors = 0;
@ -1547,7 +1547,7 @@ NTSTATUS ProcessVolumeDeviceControlIrp (PDEVICE_OBJECT DeviceObject, PEXTENSION
// of the underlaying physical disk and we report a single extent
extents->NumberOfDiskExtents = 1;
extents->Extents[0].DiskNumber = Extension->DeviceNumber;
extents->Extents[0].StartingOffset.QuadPart = Extension->BytesPerSector;
extents->Extents[0].StartingOffset.QuadPart = BYTES_PER_MB; // Set offset to 1MB to emulate the partition offset on a real MBR disk
extents->Extents[0].ExtentLength.QuadPart = Extension->DiskLength;
}
else
@ -1575,8 +1575,8 @@ NTSTATUS ProcessVolumeDeviceControlIrp (PDEVICE_OBJECT DeviceObject, PEXTENSION
capacity->Version = sizeof (STORAGE_READ_CAPACITY);
capacity->Size = sizeof (STORAGE_READ_CAPACITY);
capacity->BlockLength = Extension->BytesPerSector;
capacity->NumberOfBlocks.QuadPart = (Extension->DiskLength / Extension->BytesPerSector) + 1;
capacity->DiskLength.QuadPart = Extension->DiskLength + Extension->BytesPerSector;
capacity->DiskLength.QuadPart = Extension->DiskLength + BYTES_PER_MB; // Add 1MB to the disk size to emulate the geometry of a real MBR disk
capacity->NumberOfBlocks.QuadPart = capacity->DiskLength.QuadPart / capacity->BlockLength;
Irp->IoStatus.Status = STATUS_SUCCESS;
Irp->IoStatus.Information = sizeof (STORAGE_READ_CAPACITY);

3
src/Driver/Ntvol.c
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@ -798,8 +798,7 @@ NTSTATUS TCOpenVolume (PDEVICE_OBJECT DeviceObject,
Extension->TracksPerCylinder = 1;
Extension->SectorsPerTrack = 1;
Extension->BytesPerSector = Extension->cryptoInfo->SectorSize;
// Add extra sector since our virtual partition starts at Extension->BytesPerSector and not 0
Extension->NumberOfCylinders = (Extension->DiskLength / Extension->BytesPerSector) + 1;
Extension->NumberOfCylinders = Extension->DiskLength / Extension->BytesPerSector;
Extension->PartitionType = 0;
Extension->bRawDevice = bRawDevice;