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Use disk signature or MBR checksum to find the right disk.
Add missing device objects to device extensions. svn path=/trunk/; revision=4609
This commit is contained in:
Eric Kohl
parent
ffebf21131
commit
29a610ad56
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@ -16,7 +16,7 @@
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/* $Id: disk.c,v 1.26 2003/04/27 18:10:38 ekohl Exp $
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/* $Id: disk.c,v 1.27 2003/04/28 11:05:34 ekohl Exp $
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*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS kernel
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@ -41,6 +41,8 @@
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typedef struct _DISK_DATA
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{
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PDEVICE_EXTENSION NextPartition;
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ULONG Signature;
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ULONG MbrCheckSum;
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ULONG HiddenSectors;
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ULONG PartitionNumber;
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ULONG PartitionOrdinal;
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@ -90,6 +92,10 @@ DiskClassUpdatePartitionDeviceObjects (IN PDEVICE_OBJECT DeviceObject,
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static VOID
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ScsiDiskUpdateFixedDiskGeometry(IN PDEVICE_EXTENSION DeviceExtension);
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static BOOLEAN
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ScsiDiskCalcMbrCheckSum(IN PDEVICE_EXTENSION DeviceExtension,
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OUT PULONG Checksum);
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/* FUNCTIONS ****************************************************************/
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@ -494,6 +500,7 @@ DiskClassCreateDeviceObject(IN PDRIVER_OBJECT DriverObject,
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DiskDeviceExtension = DiskDeviceObject->DeviceExtension;
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DiskDeviceExtension->LockCount = 0;
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DiskDeviceExtension->DeviceNumber = DiskNumber;
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DiskDeviceExtension->DeviceObject = DiskDeviceObject;
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DiskDeviceExtension->PortDeviceObject = PortDeviceObject;
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DiskDeviceExtension->PhysicalDevice = DiskDeviceObject;
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DiskDeviceExtension->PortCapabilities = Capabilities;
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@ -628,9 +635,35 @@ DiskClassCreateDeviceObject(IN PDRIVER_OBJECT DriverObject,
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if (NT_SUCCESS(Status))
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{
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DPRINT("Read partition table!\n");
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DPRINT(" Number of partitions: %u\n", PartitionList->PartitionCount);
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/* Set disk signature */
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DiskData->Signature = PartitionList->Signature;
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/* Calculate MBR checksum if disk got no signature */
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if (DiskData->Signature == 0)
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{
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if (!ScsiDiskCalcMbrCheckSum(DiskDeviceExtension,
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&DiskData->MbrCheckSum))
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{
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DPRINT1("MBR checksum calculation failed for disk %lu\n",
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DiskDeviceExtension->DeviceNumber);
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}
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else
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{
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DPRINT1("MBR checksum for disk %lu is %lx\n",
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DiskDeviceExtension->DeviceNumber,
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DiskData->MbrCheckSum);
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}
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}
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else
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{
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DPRINT1("Signature on disk %lu is %lx\n",
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DiskDeviceExtension->DeviceNumber,
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DiskData->Signature);
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}
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/* Update disk geometry if disk is visible to the BIOS */
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ScsiDiskUpdateFixedDiskGeometry(DiskDeviceExtension);
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for (PartitionNumber = 0; PartitionNumber < PartitionList->PartitionCount; PartitionNumber++)
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@ -667,6 +700,7 @@ DiskClassCreateDeviceObject(IN PDRIVER_OBJECT DriverObject,
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PartitionDeviceExtension = PartitionDeviceObject->DeviceExtension;
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PartitionDeviceExtension->LockCount = 0;
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PartitionDeviceExtension->DeviceNumber = DiskNumber;
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PartitionDeviceExtension->DeviceObject = PartitionDeviceObject;
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PartitionDeviceExtension->PortDeviceObject = PortDeviceObject;
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PartitionDeviceExtension->DiskGeometry = DiskDeviceExtension->DiskGeometry;
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PartitionDeviceExtension->PhysicalDevice = DiskDeviceExtension->PhysicalDevice;
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@ -1323,6 +1357,18 @@ DiskClassUpdatePartitionDeviceObjects(IN PDEVICE_OBJECT DiskDeviceObject,
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}
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static NTSTATUS
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ScsiDiskEnumerateBusKey(IN PDEVICE_EXTENSION DeviceExtension,
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IN HANDLE BusKey,
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OUT PULONG DiskNumber)
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{
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DPRINT1("ScsiDiskEnumerateBusKey() called\n");
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}
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/**********************************************************************
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* NAME INTERNAL
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* DiskClassUpdateFixedDiskGeometry
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@ -1352,6 +1398,8 @@ ScsiDiskUpdateFixedDiskGeometry(IN PDEVICE_EXTENSION DeviceExtension)
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UNICODE_STRING KeyName;
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UNICODE_STRING ValueName;
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HANDLE SystemKey;
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HANDLE BusKey;
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ULONG DiskNumber;
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ULONG Length;
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ULONG i;
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NTSTATUS Status;
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@ -1405,8 +1453,37 @@ ScsiDiskUpdateFixedDiskGeometry(IN PDEVICE_EXTENSION DeviceExtension)
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return;
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}
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ZwClose(SystemKey);
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/* Open the 'MultifunctionAdapter' subkey */
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RtlInitUnicodeString(&KeyName,
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L"MultifunctionAdapter");
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InitializeObjectAttributes(&ObjectAttributes,
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&KeyName,
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OBJ_CASE_INSENSITIVE,
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SystemKey,
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NULL);
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Status = ZwOpenKey(&BusKey,
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KEY_READ,
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&ObjectAttributes);
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ZwClose(SystemKey);
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if (!NT_SUCCESS(Status))
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{
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DPRINT1("ZwQueryValueKey() failed (Status %lx)\n", Status);
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ExFreePool(ValueBuffer);
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return;
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}
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Status = ScsiDiskEnumerateBusKey(DeviceExtension,
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BusKey,
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&DiskNumber);
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ZwClose(BusKey);
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if (!NT_SUCCESS(Status))
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{
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DPRINT1("ScsiDiskEnumerateBusKey() failed (Status %lx)\n", Status);
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ExFreePool(ValueBuffer);
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return;
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}
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ResourceDescriptor = (PCM_FULL_RESOURCE_DESCRIPTOR)
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((PUCHAR)ValueBuffer + ValueBuffer->DataOffset);
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@ -1431,4 +1508,85 @@ ScsiDiskUpdateFixedDiskGeometry(IN PDEVICE_EXTENSION DeviceExtension)
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DPRINT1("ScsiDiskUpdateFixedDiskGeometry() done\n");
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}
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static BOOLEAN
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ScsiDiskCalcMbrCheckSum(IN PDEVICE_EXTENSION DeviceExtension,
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OUT PULONG Checksum)
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{
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IO_STATUS_BLOCK IoStatusBlock;
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LARGE_INTEGER SectorOffset;
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ULONG SectorSize;
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PULONG MbrBuffer;
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KEVENT Event;
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PIRP Irp;
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ULONG i;
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ULONG Sum;
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NTSTATUS Status;
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KeInitializeEvent(&Event,
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NotificationEvent,
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FALSE);
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/* Get the disk sector size */
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SectorSize = DeviceExtension->DiskGeometry->BytesPerSector;
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if (SectorSize < 512)
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{
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SectorSize = 512;
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}
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/* Allocate MBR buffer */
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MbrBuffer = ExAllocatePool(NonPagedPool,
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SectorSize);
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if (MbrBuffer == NULL)
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{
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return FALSE;
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}
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/* Allocate an IRP */
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SectorOffset.QuadPart = 0ULL;
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Irp = IoBuildSynchronousFsdRequest(IRP_MJ_READ,
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DeviceExtension->DeviceObject,
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MbrBuffer,
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SectorSize,
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&SectorOffset,
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&Event,
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&IoStatusBlock);
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if (Irp == NULL)
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{
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ExFreePool(MbrBuffer);
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return FALSE;
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}
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/* Call the miniport driver */
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Status = IoCallDriver(DeviceExtension->DeviceObject,
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Irp);
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if (Status == STATUS_PENDING)
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{
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KeWaitForSingleObject(&Event,
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Suspended,
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KernelMode,
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FALSE,
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NULL);
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Status = IoStatusBlock.Status;
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}
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if (!NT_SUCCESS(Status))
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{
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ExFreePool(MbrBuffer);
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return FALSE;
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}
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/* Calculate MBR checksum */
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Sum = 0;
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for (i = 0; i < 128; i++)
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{
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Sum += MbrBuffer[i];
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}
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*Checksum = ~Sum + 1;
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ExFreePool(MbrBuffer);
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return TRUE;
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}
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/* EOF */
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