disk.c File Reference

#include <ntddk.h>
#include <ntdddisk.h>
#include <scsi.h>
#include <ntddscsi.h>
#include <mountdev.h>
#include <mountmgr.h>
#include <ntiologc.h>
#include <include/class2.h>
#include <stdio.h>
#include <debug.h>

Include dependency graph for disk.c:

Go to the source code of this file.

Classes
struct	_DISK_DATA
struct	_BAD_CONTROLLER_INFORMATION

Macros
#define	NDEBUG
#define	NUMBER_OF_BAD_CONTROLLERS   (sizeof(ScsiDiskBadControllers) / sizeof(BAD_CONTROLLER_INFORMATION))
#define	DEVICE_EXTENSION_SIZE   sizeof(DEVICE_EXTENSION) + sizeof(DISK_DATA)
#define	MODE_DATA_SIZE   192
#define	VALUE_BUFFER_SIZE   2048
#define	SCSI_DISK_TIMEOUT   10
#define	PARTITION0_LIST_SIZE   4

Typedefs
typedef struct _DISK_DATA	DISK_DATA
typedef struct _DISK_DATA *	PDISK_DATA
typedef struct _BAD_CONTROLLER_INFORMATION	BAD_CONTROLLER_INFORMATION
typedef struct _BAD_CONTROLLER_INFORMATION *	PBAD_CONTROLLER_INFORMATION

Enumerations
enum	PARTITION_LIST_STATE { NotInitialized, Initializing, Initialized }

Functions
NTSTATUS NTAPI	DriverEntry (IN PDRIVER_OBJECT DriverObject, IN PUNICODE_STRING RegistryPath)
BOOLEAN NTAPI	ScsiDiskDeviceVerification (IN PINQUIRYDATA InquiryData)
BOOLEAN NTAPI	FindScsiDisks (IN PDRIVER_OBJECT DriveObject, IN PUNICODE_STRING RegistryPath, IN PCLASS_INIT_DATA InitializationData, IN PDEVICE_OBJECT PortDeviceObject, IN ULONG PortNumber)
NTSTATUS NTAPI	ScsiDiskCreateClose (IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp)
NTSTATUS NTAPI	ScsiDiskReadWriteVerification (IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp)
NTSTATUS NTAPI	ScsiDiskDeviceControl (IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp)
VOID NTAPI	ScsiDiskProcessError (PDEVICE_OBJECT DeviceObject, PSCSI_REQUEST_BLOCK Srb, NTSTATUS *Status, BOOLEAN *Retry)
NTSTATUS NTAPI	ScsiDiskShutdownFlush (IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp)
VOID NTAPI	DisableWriteCache (IN PDEVICE_OBJECT DeviceObject, IN PSCSI_INQUIRY_DATA LunInfo)
BOOLEAN NTAPI	ScsiDiskModeSelect (IN PDEVICE_OBJECT DeviceObject, IN PCHAR ModeSelectBuffer, IN ULONG Length, IN BOOLEAN SavePage)
BOOLEAN NTAPI	IsFloppyDevice (IN PDEVICE_OBJECT DeviceObject)
BOOLEAN NTAPI	CalculateMbrCheckSum (IN PDEVICE_EXTENSION DeviceExtension, OUT PULONG Checksum)
BOOLEAN NTAPI	EnumerateBusKey (IN PDEVICE_EXTENSION DeviceExtension, HANDLE BusKey, PULONG DiskNumber)
VOID NTAPI	UpdateGeometry (IN PDEVICE_EXTENSION DeviceExtension)
NTSTATUS NTAPI	UpdateRemovableGeometry (IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp)
NTSTATUS NTAPI	CreateDiskDeviceObject (IN PDRIVER_OBJECT DriverObject, IN PUNICODE_STRING RegistryPath, IN PDEVICE_OBJECT PortDeviceObject, IN ULONG PortNumber, IN PULONG DeviceCount, IN PIO_SCSI_CAPABILITIES PortCapabilities, IN PSCSI_INQUIRY_DATA LunInfo, IN PCLASS_INIT_DATA InitData)
NTSTATUS NTAPI	CreatePartitionDeviceObjects (IN PDEVICE_OBJECT PhysicalDeviceObject, IN PUNICODE_STRING RegistryPath)
VOID NTAPI	UpdateDeviceObjects (IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp)
VOID NTAPI	ScanForSpecial (PDEVICE_OBJECT DeviceObject, PSCSI_INQUIRY_DATA LunInfo, PIO_SCSI_CAPABILITIES PortCapabilities)
VOID NTAPI	ResetScsiBus (IN PDEVICE_OBJECT DeviceObject)
NTSTATUS NTAPI	ScsiDiskFileSystemControl (PDEVICE_OBJECT DeviceObject, PIRP Irp)
VOID NTAPI	ReportToMountMgr (IN PDEVICE_OBJECT DiskDeviceObject)
NTSTATUS NTAPI	ScsiDiskDeviceControl (PDEVICE_OBJECT DeviceObject, PIRP Irp)
BOOLEAN NTAPI	IsFloppyDevice (PDEVICE_OBJECT DeviceObject)

Variables
BAD_CONTROLLER_INFORMATION const	ScsiDiskBadControllers []

Macro Definition Documentation

DEVICE_EXTENSION_SIZE

#define DEVICE_EXTENSION_SIZE   sizeof(DEVICE_EXTENSION) + sizeof(DISK_DATA)

Definition at line 162 of file disk.c.

MODE_DATA_SIZE

#define MODE_DATA_SIZE   192

Definition at line 164 of file disk.c.

NDEBUG

#define NDEBUG

Definition at line 19 of file disk.c.

NUMBER_OF_BAD_CONTROLLERS

#define NUMBER_OF_BAD_CONTROLLERS   (sizeof(ScsiDiskBadControllers) / sizeof(BAD_CONTROLLER_INFORMATION))

Definition at line 161 of file disk.c.

PARTITION0_LIST_SIZE

#define PARTITION0_LIST_SIZE   4

Definition at line 167 of file disk.c.

SCSI_DISK_TIMEOUT

#define SCSI_DISK_TIMEOUT   10

Definition at line 166 of file disk.c.

VALUE_BUFFER_SIZE

#define VALUE_BUFFER_SIZE   2048

Definition at line 165 of file disk.c.

Typedef Documentation

BAD_CONTROLLER_INFORMATION

typedef struct _BAD_CONTROLLER_INFORMATION BAD_CONTROLLER_INFORMATION

DISK_DATA

typedef struct _DISK_DATA DISK_DATA

PBAD_CONTROLLER_INFORMATION

typedef struct _BAD_CONTROLLER_INFORMATION * PBAD_CONTROLLER_INFORMATION

PDISK_DATA

typedef struct _DISK_DATA * PDISK_DATA

Enumeration Type Documentation

PARTITION_LIST_STATE

enum PARTITION_LIST_STATE

Enumerator
NotInitialized
Initializing
Initialized

Definition at line 30 of file disk.c.

             {
    NotInitialized,
    Initializing,
    Initialized
} PARTITION_LIST_STATE;

Function Documentation

CalculateMbrCheckSum()

BOOLEAN NTAPI CalculateMbrCheckSum	(	IN PDEVICE_EXTENSION	DeviceExtension,
		OUT PULONG	Checksum
	)

Definition at line 3759 of file disk.c.

{
    LARGE_INTEGER   sectorZero;
    PIRP            irp;
    IO_STATUS_BLOCK ioStatus;
    KEVENT          event;
    NTSTATUS        status;
    ULONG           sectorSize;
    PULONG          mbr;
    ULONG           i;

    PAGED_CODE();
    sectorZero.QuadPart = (LONGLONG) 0;

    //
    // Create notification event object to be used to signal the inquiry
    // request completion.
    //

    KeInitializeEvent(&event, NotificationEvent, FALSE);

    //
    // Get sector size.
    //

    sectorSize = DeviceExtension->DiskGeometry->Geometry.BytesPerSector;

    //
    // Make sure sector size is at least 512 bytes.
    //

    if (sectorSize < 512) {
        sectorSize = 512;
    }

    //
    // Allocate buffer for sector read.
    //

    mbr = ExAllocatePool(NonPagedPoolCacheAligned, sectorSize);

    if (!mbr) {
        return FALSE;
    }

    //
    // Build IRP to read MBR.
    //

    irp = IoBuildSynchronousFsdRequest(IRP_MJ_READ,
                                       DeviceExtension->DeviceObject,
                                       mbr,
                                       sectorSize,
                                       &sectorZero,
                                       &event,
                                       &ioStatus );

    if (!irp) {
        ExFreePool(mbr);
        return FALSE;
    }

    //
    // Pass request to port driver and wait for request to complete.
    //

    status = IoCallDriver(DeviceExtension->DeviceObject,
                          irp);

    if (status == STATUS_PENDING) {
        KeWaitForSingleObject(&event,
                              Suspended,
                              KernelMode,
                              FALSE,
                              NULL);
        status = ioStatus.Status;
    }

    if (!NT_SUCCESS(status)) {
        ExFreePool(mbr);
        return FALSE;
    }

    //
    // Calculate MBR checksum.
    //

    *Checksum = 0;

    for (i = 0; i < 128; i++) {
        *Checksum += mbr[i];
    }

    *Checksum = ~*Checksum + 1;

    ExFreePool(mbr);
    return TRUE;
}

Referenced by CreatePartitionDeviceObjects().

CreateDiskDeviceObject()

NTSTATUS NTAPI CreateDiskDeviceObject	(	IN PDRIVER_OBJECT	DriverObject,
		IN PUNICODE_STRING	RegistryPath,
		IN PDEVICE_OBJECT	PortDeviceObject,
		IN ULONG	PortNumber,
		IN PULONG	DeviceCount,
		IN PIO_SCSI_CAPABILITIES	PortCapabilities,
		IN PSCSI_INQUIRY_DATA	LunInfo,
		IN PCLASS_INIT_DATA	InitData
	)

Definition at line 621 of file disk.c.

{
    CCHAR          ntNameBuffer[MAXIMUM_FILENAME_LENGTH];
    STRING         ntNameString;
    UNICODE_STRING ntUnicodeString;
    OBJECT_ATTRIBUTES objectAttributes;
    HANDLE         handle;
    NTSTATUS       status;
    PDEVICE_OBJECT deviceObject = NULL;
    //PDEVICE_OBJECT physicalDevice;
    PDISK_GEOMETRY_EX diskGeometry = NULL;
    PDEVICE_EXTENSION deviceExtension = NULL;
    //PDEVICE_EXTENSION physicalDeviceExtension;
    UCHAR          pathId = LunInfo->PathId;
    UCHAR          targetId = LunInfo->TargetId;
    UCHAR          lun = LunInfo->Lun;
    //BOOLEAN        writeCache;
    PVOID          senseData = NULL;
    //ULONG          srbFlags;
    ULONG          timeOut = 0;
    BOOLEAN        srbListInitialized = FALSE;


    PAGED_CODE();

    //
    // Set up an object directory to contain the objects for this
    // device and all its partitions.
    //

    sprintf(ntNameBuffer,
            "\\Device\\Harddisk%lu",
            *DeviceCount);

    RtlInitString(&ntNameString,
                  ntNameBuffer);

    status = RtlAnsiStringToUnicodeString(&ntUnicodeString,
                                          &ntNameString,
                                          TRUE);

    if (!NT_SUCCESS(status)) {
        return(status);
    }

    InitializeObjectAttributes(&objectAttributes,
                               &ntUnicodeString,
                               OBJ_CASE_INSENSITIVE | OBJ_PERMANENT,
                               NULL,
                               NULL);

    status = ZwCreateDirectoryObject(&handle,
                                     DIRECTORY_ALL_ACCESS,
                                     &objectAttributes);

    RtlFreeUnicodeString(&ntUnicodeString);

    if (!NT_SUCCESS(status)) {

        DebugPrint((1,
                    "CreateDiskDeviceObjects: Could not create directory %s\n",
                    ntNameBuffer));

        return(status);
    }

    //
    // Claim the device.
    //

    status = ScsiClassClaimDevice(PortDeviceObject,
                                  LunInfo,
                                  FALSE,
                                  &PortDeviceObject);

    if (!NT_SUCCESS(status)) {
        ZwMakeTemporaryObject(handle);
        ZwClose(handle);
        return status;
    }

    //
    // Create a device object for this device. Each physical disk will
    // have at least one device object. The required device object
    // describes the entire device. Its directory path is
    // \Device\HarddiskN\Partition0, where N = device number.
    //

    sprintf(ntNameBuffer,
            "\\Device\\Harddisk%lu\\Partition0",
            *DeviceCount);


    status = ScsiClassCreateDeviceObject(DriverObject,
                                         ntNameBuffer,
                                         NULL,
                                         &deviceObject,
                                         InitData);

    if (!NT_SUCCESS(status)) {

        DebugPrint((1,
                    "CreateDiskDeviceObjects: Can not create device object %s\n",
                    ntNameBuffer));

        goto CreateDiskDeviceObjectsExit;
    }

    //
    // Indicate that IRPs should include MDLs for data transfers.
    //

    deviceObject->Flags |= DO_DIRECT_IO;

    //
    // Check if this is during initialization. If not indicate that
    // system initialization already took place and this disk is ready
    // to be accessed.
    //

    if (!RegistryPath) {
        deviceObject->Flags &= ~DO_DEVICE_INITIALIZING;
    }

    //
    // Check for removable media support.
    //

    if (((PINQUIRYDATA)LunInfo->InquiryData)->RemovableMedia) {
        deviceObject->Characteristics |= FILE_REMOVABLE_MEDIA;
    }

    //
    // Set up required stack size in device object.
    //

    deviceObject->StackSize = (CCHAR)PortDeviceObject->StackSize + 1;

    deviceExtension = deviceObject->DeviceExtension;

    //
    // Allocate spinlock for split request completion.
    //

    KeInitializeSpinLock(&deviceExtension->SplitRequestSpinLock);

    //
    // Initialize lock count to zero. The lock count is used to
    // disable the ejection mechanism on devices that support
    // removable media. Only the lock count in the physical
    // device extension is used.
    //

    deviceExtension->LockCount = 0;

    //
    // Save system disk number.
    //

    deviceExtension->DeviceNumber = *DeviceCount;

    //
    // Copy port device object pointer to the device extension.
    //

    deviceExtension->PortDeviceObject = PortDeviceObject;

    //
    // Set the alignment requirements for the device based on the
    // host adapter requirements
    //

    if (PortDeviceObject->AlignmentRequirement > deviceObject->AlignmentRequirement) {
        deviceObject->AlignmentRequirement = PortDeviceObject->AlignmentRequirement;
    }

    //
    // This is the physical device object.
    //

    //physicalDevice = deviceObject;
    //physicalDeviceExtension = deviceExtension;

    //
    // Save address of port driver capabilities.
    //

    deviceExtension->PortCapabilities = PortCapabilities;

    //
    // Build the lookaside list for srb's for the physical disk. Should only
    // need a couple.
    //

    ScsiClassInitializeSrbLookasideList(deviceExtension,
                                        PARTITION0_LIST_SIZE);

    srbListInitialized = TRUE;

    //
    // Initialize the srb flags.
    //

    if (((PINQUIRYDATA)LunInfo->InquiryData)->CommandQueue &&
        PortCapabilities->TaggedQueuing) {

        deviceExtension->SrbFlags  = SRB_FLAGS_QUEUE_ACTION_ENABLE;

    } else {

        deviceExtension->SrbFlags  = 0;

    }

    //
    // Allow queued requests if this is not removable media.
    //

    if (!(deviceObject->Characteristics & FILE_REMOVABLE_MEDIA)) {

        deviceExtension->SrbFlags |= SRB_FLAGS_NO_QUEUE_FREEZE;

    }

    //
    // Look for controller that require special flags.
    //

    ScanForSpecial(deviceObject,
                    LunInfo,
                    PortCapabilities);

    //srbFlags = deviceExtension->SrbFlags;

    //
    // Allocate buffer for drive geometry.
    //

    diskGeometry = ExAllocatePool(NonPagedPool, sizeof(DISK_GEOMETRY_EX));

    if (diskGeometry == NULL) {

        DebugPrint((1,
           "CreateDiskDeviceObjects: Can not allocate disk geometry buffer\n"));
        status = STATUS_INSUFFICIENT_RESOURCES;
        goto CreateDiskDeviceObjectsExit;
    }

    deviceExtension->DiskGeometry = diskGeometry;

    //
    // Allocate request sense buffer.
    //

    senseData = ExAllocatePool(NonPagedPoolCacheAligned, SENSE_BUFFER_SIZE);

    if (senseData == NULL) {

        //
        // The buffer can not be allocated.
        //

        DebugPrint((1,
           "CreateDiskDeviceObjects: Can not allocate request sense buffer\n"));

        status = STATUS_INSUFFICIENT_RESOURCES;
        goto CreateDiskDeviceObjectsExit;
    }

    //
    // Set the sense data pointer in the device extension.
    //

    deviceExtension->SenseData = senseData;

    //
    // Physical device object will describe the entire
    // device, starting at byte offset 0.
    //

    deviceExtension->StartingOffset.QuadPart = (LONGLONG)(0);

    //
    // TargetId/LUN describes a device location on the SCSI bus.
    // This information comes from the inquiry buffer.
    //

    deviceExtension->PortNumber = (UCHAR)PortNumber;
    deviceExtension->PathId = pathId;
    deviceExtension->TargetId = targetId;
    deviceExtension->Lun = lun;

    //
    // Set timeout value in seconds.
    //

    timeOut = ScsiClassQueryTimeOutRegistryValue(RegistryPath);
    if (timeOut) {
        deviceExtension->TimeOutValue = timeOut;
    } else {
        deviceExtension->TimeOutValue = SCSI_DISK_TIMEOUT;
    }

    //
    // Back pointer to device object.
    //

    deviceExtension->DeviceObject = deviceObject;

    //
    // If this is a removable device, then make sure it is not a floppy.
    // Perform a mode sense command to determine the media type. Note
    // IsFloppyDevice also checks for write cache enabled.
    //

#if 0
    if (IsFloppyDevice(deviceObject) && deviceObject->Characteristics & FILE_REMOVABLE_MEDIA &&
        (((PINQUIRYDATA)LunInfo->InquiryData)->DeviceType == DIRECT_ACCESS_DEVICE)) {

        status = STATUS_NO_SUCH_DEVICE;
        goto CreateDiskDeviceObjectsExit;
    }
#endif

    DisableWriteCache(deviceObject,LunInfo);

    //writeCache = deviceExtension->DeviceFlags & DEV_WRITE_CACHE;

    //
    // NOTE: At this point one device object has been successfully created.
    // from here on out return success.
    //

    //
    // Do READ CAPACITY. This SCSI command
    // returns the number of bytes on a device.
    // Device extension is updated with device size.
    //

    status = ScsiClassReadDriveCapacity(deviceObject);

    //
    // If the read capacity failed then just return, unless this is a
    // removable disk where a device object partition needs to be created.
    //

    if (!NT_SUCCESS(status) &&
        !(deviceObject->Characteristics & FILE_REMOVABLE_MEDIA)) {

        DebugPrint((1,
            "CreateDiskDeviceObjects: Can't read capacity for device %s\n",
            ntNameBuffer));

        return(STATUS_SUCCESS);

    } else {

        //
        // Make sure the volume verification bit is off so that
        // IoReadPartitionTable will work.
        //

        deviceObject->Flags &= ~DO_VERIFY_VOLUME;
    }

    status = CreatePartitionDeviceObjects(deviceObject, RegistryPath);

    if (NT_SUCCESS(status))
        return STATUS_SUCCESS;


CreateDiskDeviceObjectsExit:

    //
    // Release the device since an error occurred.
    //

    ScsiClassClaimDevice(PortDeviceObject,
                         LunInfo,
                         TRUE,
                         NULL);

    if (diskGeometry != NULL) {
        ExFreePool(diskGeometry);
    }

    if (senseData != NULL) {
        ExFreePool(senseData);
    }

    if (deviceObject != NULL) {

        if (srbListInitialized) {
            ExDeleteNPagedLookasideList(&deviceExtension->SrbLookasideListHead);
        }

        IoDeleteDevice(deviceObject);
    }

    //
    // Delete directory and return.
    //

    if (!NT_SUCCESS(status)) {
        ZwMakeTemporaryObject(handle);
    }

    ZwClose(handle);

    return(status);

} // end CreateDiskDeviceObjects()

Referenced by FindScsiDisks().

CreatePartitionDeviceObjects()

NTSTATUS NTAPI CreatePartitionDeviceObjects	(	IN PDEVICE_OBJECT	PhysicalDeviceObject,
		IN PUNICODE_STRING	RegistryPath
	)

Definition at line 1196 of file disk.c.

{
    CCHAR          ntNameBuffer[MAXIMUM_FILENAME_LENGTH];
    ULONG          partitionNumber = 0;
    NTSTATUS       status;
    PDEVICE_OBJECT deviceObject = NULL;
    PDISK_GEOMETRY_EX diskGeometry = NULL;
    PDRIVE_LAYOUT_INFORMATION partitionList = NULL;
    PDEVICE_EXTENSION deviceExtension;
    PDEVICE_EXTENSION physicalDeviceExtension;
    PCLASS_INIT_DATA initData = NULL;
    PDISK_DATA     diskData;
    PDISK_DATA     physicalDiskData;
    ULONG          bytesPerSector;
    UCHAR          sectorShift;
    ULONG          srbFlags;
    ULONG          dmByteSkew = 0;
    PULONG         dmSkew;
    BOOLEAN        dmActive = FALSE;
    ULONG          numberListElements = 0;


    //
    // Get physical device geometry information for partition table reads.
    //

    physicalDeviceExtension = PhysicalDeviceObject->DeviceExtension;
    diskGeometry = physicalDeviceExtension->DiskGeometry;
    bytesPerSector = diskGeometry->Geometry.BytesPerSector;

    //
    // Make sure sector size is not zero.
    //

    if (bytesPerSector == 0) {

        //
        // Default sector size for disk is 512.
        //

        bytesPerSector = diskGeometry->Geometry.BytesPerSector = 512;
    }

    sectorShift = physicalDeviceExtension->SectorShift;

    //
    // Set pointer to disk data area that follows device extension.
    //

    diskData = (PDISK_DATA)(physicalDeviceExtension + 1);
    diskData->PartitionListState = Initializing;

    //
    // Determine is DM Driver is loaded on an IDE drive that is
    // under control of Atapi - this could be either a crashdump or
    // an Atapi device is sharing the controller with an IDE disk.
    //

    HalExamineMBR(PhysicalDeviceObject,
                  physicalDeviceExtension->DiskGeometry->Geometry.BytesPerSector,
                  (ULONG)0x54,
                  (PVOID)&dmSkew);

    if (dmSkew) {

        //
        // Update the device extension, so that the call to IoReadPartitionTable
        // will get the correct information. Any I/O to this disk will have
        // to be skewed by *dmSkew sectors aka DMByteSkew.
        //

        physicalDeviceExtension->DMSkew = *dmSkew;
        physicalDeviceExtension->DMActive = TRUE;
        physicalDeviceExtension->DMByteSkew = physicalDeviceExtension->DMSkew * bytesPerSector;

        //
        // Save away the information that we need, since this deviceExtension will soon be
        // blown away.
        //

        dmActive = TRUE;
        dmByteSkew = physicalDeviceExtension->DMByteSkew;

    }

#ifdef __REACTOS__
    //
    // HACK so that we can use NT5+ NTOS functions with this NT4 driver
    // for removable devices and avoid an infinite recursive loop between
    // disk!UpdateRemovableGeometry() and ntos!IoReadPartitionTable().
    //
    diskData->UpdateRemovableGeometryCount = 0;
#endif

    //
    // Create objects for all the partitions on the device.
    //

    status = IoReadPartitionTable(PhysicalDeviceObject,
                                  physicalDeviceExtension->DiskGeometry->Geometry.BytesPerSector,
                                  TRUE,
                                  (PVOID)&partitionList);

    //
    // If the I/O read partition table failed and this is a removable device,
    // then fix up the partition list to make it look like there is one
    // zero length partition.
    //
    DPRINT("IoReadPartitionTable() status: 0x%08X\n", status);
    if ((!NT_SUCCESS(status) || partitionList->PartitionCount == 0) &&
        PhysicalDeviceObject->Characteristics & FILE_REMOVABLE_MEDIA) {

        if (!NT_SUCCESS(status)) {

            //
            // Remember this disk is not ready.
            //

            diskData->DriveNotReady = TRUE;

        } else {

            //
            // Free the partition list allocated by IoReadPartitionTable.
            //

            ExFreePool(partitionList);
        }

        //
        // Allocate and zero a partition list.
        //

        partitionList = ExAllocatePool(NonPagedPool, sizeof(*partitionList));


        if (partitionList != NULL) {

            RtlZeroMemory( partitionList, sizeof( *partitionList ));

            //
            // Set the partition count to one and the status to success
            // so one device object will be created. Set the partition type
            // to a bogus value.
            //

            partitionList->PartitionCount = 1;

            status = STATUS_SUCCESS;
        }
    }

    if (NT_SUCCESS(status)) {

        //
        // Record disk signature.
        //

        diskData->Signature = partitionList->Signature;

        //
        // If disk signature is zero, then calculate the MBR checksum.
        //

        if (!diskData->Signature) {

            if (!CalculateMbrCheckSum(physicalDeviceExtension,
                                      &diskData->MbrCheckSum)) {

                DebugPrint((1,
                            "SCSIDISK: Can't calculate MBR checksum for disk %x\n",
                            physicalDeviceExtension->DeviceNumber));
            } else {

                DebugPrint((2,
                           "SCSIDISK: MBR checksum for disk %x is %x\n",
                           physicalDeviceExtension->DeviceNumber,
                           diskData->MbrCheckSum));
            }
        }

        //
        // Check the registry and determine if the BIOS knew about this drive.  If
        // it did then update the geometry with the BIOS information.
        //

        UpdateGeometry(physicalDeviceExtension);

        srbFlags = physicalDeviceExtension->SrbFlags;

        initData = ExAllocatePool(NonPagedPool, sizeof(CLASS_INIT_DATA));
        if (!initData)
        {
            DebugPrint((1,
                        "Disk.CreatePartitionDeviceObjects - Allocation of initData failed\n"));

            status = STATUS_INSUFFICIENT_RESOURCES;
            goto CreatePartitionDeviceObjectsExit;
        }

        RtlZeroMemory(initData, sizeof(CLASS_INIT_DATA));

        initData->InitializationDataSize     = sizeof(CLASS_INIT_DATA);
        initData->DeviceExtensionSize        = DEVICE_EXTENSION_SIZE;
        initData->DeviceType                 = FILE_DEVICE_DISK;
        initData->DeviceCharacteristics      = PhysicalDeviceObject->Characteristics;
        initData->ClassError                 = physicalDeviceExtension->ClassError;
        initData->ClassReadWriteVerification = physicalDeviceExtension->ClassReadWriteVerification;
        initData->ClassFindDevices           = physicalDeviceExtension->ClassFindDevices;
        initData->ClassDeviceControl         = physicalDeviceExtension->ClassDeviceControl;
        initData->ClassShutdownFlush         = physicalDeviceExtension->ClassShutdownFlush;
        initData->ClassCreateClose           = physicalDeviceExtension->ClassCreateClose;
        initData->ClassStartIo               = physicalDeviceExtension->ClassStartIo;

        //
        // Create device objects for the device partitions (if any).
        // PartitionCount includes physical device partition 0,
        // so only one partition means no objects to create.
        //

        DebugPrint((2,
                    "CreateDiskDeviceObjects: Number of partitions is %d\n",
                    partitionList->PartitionCount));

        for (partitionNumber = 0; partitionNumber <
            partitionList->PartitionCount; partitionNumber++) {

            //
            // Create partition object and set up partition parameters.
            //

            sprintf(ntNameBuffer,
                    "\\Device\\Harddisk%lu\\Partition%lu",
                    physicalDeviceExtension->DeviceNumber,
                    partitionNumber + 1);

            DebugPrint((2,
                        "CreateDiskDeviceObjects: Create device object %s\n",
                        ntNameBuffer));

            status = ScsiClassCreateDeviceObject(PhysicalDeviceObject->DriverObject,
                                                 ntNameBuffer,
                                                 PhysicalDeviceObject,
                                                 &deviceObject,
                                                 initData);

            if (!NT_SUCCESS(status)) {

                DebugPrint((1, "CreateDiskDeviceObjects: Can't create device object for %s\n", ntNameBuffer));

                break;
            }

            //
            // Set up device object fields.
            //

            deviceObject->Flags |= DO_DIRECT_IO;

            //
            // Check if this is during initialization. If not indicate that
            // system initialization already took place and this disk is ready
            // to be accessed.
            //

            if (!RegistryPath) {
                deviceObject->Flags &= ~DO_DEVICE_INITIALIZING;
            }

            deviceObject->StackSize = (CCHAR)physicalDeviceExtension->PortDeviceObject->StackSize + 1;

            //
            // Set up device extension fields.
            //

            deviceExtension = deviceObject->DeviceExtension;

            if (dmActive) {

                //
                // Restore any saved DM values.
                //

                deviceExtension->DMByteSkew = dmByteSkew;
                deviceExtension->DMSkew     = *dmSkew;
                deviceExtension->DMActive   = TRUE;

            }

            //
            // Link new device extension to previous disk data
            // to support dynamic partitioning.
            //

            diskData->NextPartition = deviceExtension;

            //
            // Get pointer to new disk data.
            //

            diskData = (PDISK_DATA)(deviceExtension + 1);

            //
            // Set next partition pointer to NULL in case this is the
            // last partition.
            //

            diskData->NextPartition = NULL;

            //
            // Allocate spinlock for zoning for split-request completion.
            //

            KeInitializeSpinLock(&deviceExtension->SplitRequestSpinLock);

            //
            // Copy port device object pointer to device extension.
            //

            deviceExtension->PortDeviceObject = physicalDeviceExtension->PortDeviceObject;

            //
            // Set the alignment requirements for the device based on the
            // host adapter requirements
            //

            if (physicalDeviceExtension->PortDeviceObject->AlignmentRequirement > deviceObject->AlignmentRequirement) {
                deviceObject->AlignmentRequirement = physicalDeviceExtension->PortDeviceObject->AlignmentRequirement;
            }


            if (srbFlags & SRB_FLAGS_QUEUE_ACTION_ENABLE) {
                numberListElements = 30;
            } else {
                numberListElements = 8;
            }

            //
            // Build the lookaside list for srb's for this partition based on
            // whether the adapter and disk can do tagged queueing.
            //

            ScsiClassInitializeSrbLookasideList(deviceExtension,
                                                numberListElements);

            deviceExtension->SrbFlags = srbFlags;

            //
            // Set the sense-data pointer in the device extension.
            //

            deviceExtension->SenseData        = physicalDeviceExtension->SenseData;
            deviceExtension->PortCapabilities = physicalDeviceExtension->PortCapabilities;
            deviceExtension->DiskGeometry     = diskGeometry;
            diskData->PartitionOrdinal        = diskData->PartitionNumber = partitionNumber + 1;
            diskData->PartitionType           = partitionList->PartitionEntry[partitionNumber].PartitionType;
            diskData->BootIndicator           = partitionList->PartitionEntry[partitionNumber].BootIndicator;

            DebugPrint((2, "CreateDiskDeviceObjects: Partition type is %x\n",
                diskData->PartitionType));

            deviceExtension->StartingOffset  = partitionList->PartitionEntry[partitionNumber].StartingOffset;
            deviceExtension->PartitionLength = partitionList->PartitionEntry[partitionNumber].PartitionLength;
            diskData->HiddenSectors          = partitionList->PartitionEntry[partitionNumber].HiddenSectors;
            deviceExtension->PortNumber      = physicalDeviceExtension->PortNumber;
            deviceExtension->PathId          = physicalDeviceExtension->PathId;
            deviceExtension->TargetId        = physicalDeviceExtension->TargetId;
            deviceExtension->Lun             = physicalDeviceExtension->Lun;

            //
            // Check for removable media support.
            //

            if (PhysicalDeviceObject->Characteristics & FILE_REMOVABLE_MEDIA) {
                deviceObject->Characteristics |= FILE_REMOVABLE_MEDIA;
            }

            //
            // Set timeout value in seconds.
            //

            deviceExtension->TimeOutValue = physicalDeviceExtension->TimeOutValue;
            deviceExtension->DiskGeometry->Geometry.BytesPerSector = bytesPerSector;
            deviceExtension->SectorShift  = sectorShift;
            deviceExtension->DeviceObject = deviceObject;
            deviceExtension->DeviceFlags |= physicalDeviceExtension->DeviceFlags;

            //
            // Now we're done, report to the MountMgr.
            // This is a HACK required to have the driver
            // handle the associated DosDevices.
            //

            ReportToMountMgr(deviceObject);

        } // end for (partitionNumber) ...

        //
        // Free the buffer allocated by reading the
        // partition table.
        //

        ExFreePool(partitionList);

        if (dmSkew) {
            ExFreePool(dmSkew);
        }

    } else {

CreatePartitionDeviceObjectsExit:

        if (partitionList) {
            ExFreePool(partitionList);
        }
        if (initData) {
            ExFreePool(initData);
        }

        if (dmSkew) {
            ExFreePool(dmSkew);
        }

        return status;

    } // end if...else


    physicalDiskData = (PDISK_DATA)(physicalDeviceExtension + 1);
    physicalDiskData->PartitionListState = Initialized;

    return(STATUS_SUCCESS);


} // end CreatePartitionDeviceObjects()

Referenced by CreateDiskDeviceObject(), and ScsiDiskDeviceControl().

DisableWriteCache()

VOID NTAPI DisableWriteCache	(	IN PDEVICE_OBJECT	DeviceObject,
		IN PSCSI_INQUIRY_DATA	LunInfo
	)

Definition at line 3552 of file disk.c.

{
    PDEVICE_EXTENSION          deviceExtension = DeviceObject->DeviceExtension;
    PINQUIRYDATA               InquiryData     = (PINQUIRYDATA)LunInfo->InquiryData;
    BAD_CONTROLLER_INFORMATION const *controller;
    ULONG                      j,length;
    PVOID                      modeData;
    PUCHAR                     pageData;

    for (j = 0; j <  NUMBER_OF_BAD_CONTROLLERS; j++) {

        controller = &ScsiDiskBadControllers[j];

        if (!controller->DisableWriteCache || strncmp(controller->InquiryString, (PCCHAR)InquiryData->VendorId, strlen(controller->InquiryString))) {
            continue;
        }

        DebugPrint((1, "ScsiDisk.DisableWriteCache, Found bad controller! %s\n", controller->InquiryString));

        modeData = ExAllocatePool(NonPagedPoolCacheAligned, MODE_DATA_SIZE);

        if (modeData == NULL) {

            DebugPrint((1,
                        "ScsiDisk.DisableWriteCache: Check for write-cache enable failed\n"));
            return;
        }

        RtlZeroMemory(modeData, MODE_DATA_SIZE);

        length = ScsiClassModeSense(DeviceObject,
                                    modeData,
                                    MODE_DATA_SIZE,
                                    MODE_SENSE_RETURN_ALL);

        if (length < sizeof(MODE_PARAMETER_HEADER)) {

            //
            // Retry the request in case of a check condition.
            //

            length = ScsiClassModeSense(DeviceObject,
                                    modeData,
                                    MODE_DATA_SIZE,
                                    MODE_SENSE_RETURN_ALL);

            if (length < sizeof(MODE_PARAMETER_HEADER)) {


                DebugPrint((1,
                            "ScsiDisk.DisableWriteCache: Mode Sense failed\n"));

                ExFreePool(modeData);
                return;

            }
        }

        //
        // If the length is greater than length indicated by the mode data reset
        // the data to the mode data.
        //

        if (length > (ULONG) ((PMODE_PARAMETER_HEADER) modeData)->ModeDataLength + 1) {
            length = ((PMODE_PARAMETER_HEADER) modeData)->ModeDataLength + 1;
        }

        //
        // Check to see if the write cache is enabled.
        //

        pageData = ScsiClassFindModePage( modeData, length, MODE_PAGE_CACHING, TRUE);

        //
        // Assume that write cache is disabled or not supported.
        //

        deviceExtension->DeviceFlags &= ~DEV_WRITE_CACHE;

        //
        // Check if valid caching page exists.
        //

        if (pageData != NULL) {

            BOOLEAN savePage = FALSE;

            savePage = (BOOLEAN)(((PMODE_CACHING_PAGE)pageData)->PageSavable);

            //
            // Check if write cache is disabled.
            //

            if (((PMODE_CACHING_PAGE)pageData)->WriteCacheEnable) {

                PIO_ERROR_LOG_PACKET errorLogEntry;
                LONG                 errorCode;


                //
                // Disable write cache and ensure necessary fields are zeroed.
                //

                ((PMODE_CACHING_PAGE)pageData)->WriteCacheEnable = FALSE;
                ((PMODE_CACHING_PAGE)pageData)->Reserved = 0;
                ((PMODE_CACHING_PAGE)pageData)->PageSavable = 0;
                ((PMODE_CACHING_PAGE)pageData)->Reserved2 = 0;

                //
                // Extract length from caching page.
                //

                length = ((PMODE_CACHING_PAGE)pageData)->PageLength;

                //
                // Compensate for page code and page length.
                //

                length += 2;

                //
                // Issue mode select to set the parameter.
                //

                if (ScsiDiskModeSelect(DeviceObject,
                                       (PCHAR)pageData,
                                       length,
                                       savePage)) {

                    DebugPrint((1,
                               "SCSIDISK: Disk write cache disabled\n"));

                    deviceExtension->DeviceFlags &= ~DEV_WRITE_CACHE;
                    errorCode = IO_WRITE_CACHE_DISABLED;

                } else {
                    if (ScsiDiskModeSelect(DeviceObject,
                                           (PCHAR)pageData,
                                           length,
                                           savePage)) {

                        DebugPrint((1,
                                   "SCSIDISK: Disk write cache disabled\n"));


                        deviceExtension->DeviceFlags &= ~DEV_WRITE_CACHE;
                        errorCode = IO_WRITE_CACHE_DISABLED;

                    } else {

                            DebugPrint((1,
                                       "SCSIDISK: Mode select to disable write cache failed\n"));

                            deviceExtension->DeviceFlags |= DEV_WRITE_CACHE;
                            errorCode = IO_WRITE_CACHE_ENABLED;
                    }
                }

                //
                // Log the appropriate informational or error entry.
                //

                errorLogEntry = (PIO_ERROR_LOG_PACKET)IoAllocateErrorLogEntry(
                                                         DeviceObject,
                                                         sizeof(IO_ERROR_LOG_PACKET) + 3
                                                             * sizeof(ULONG));

                if (errorLogEntry != NULL) {

                    errorLogEntry->FinalStatus     = STATUS_SUCCESS;
                    errorLogEntry->ErrorCode       = errorCode;
                    errorLogEntry->SequenceNumber  = 0;
                    errorLogEntry->MajorFunctionCode = IRP_MJ_SCSI;
                    errorLogEntry->IoControlCode   = 0;
                    errorLogEntry->RetryCount      = 0;
                    errorLogEntry->UniqueErrorValue = 0x1;
                    errorLogEntry->DumpDataSize    = 3 * sizeof(ULONG);
                    errorLogEntry->DumpData[0]     = LunInfo->PathId;
                    errorLogEntry->DumpData[1]     = LunInfo->TargetId;
                    errorLogEntry->DumpData[2]     = LunInfo->Lun;

                    //
                    // Write the error log packet.
                    //

                    IoWriteErrorLogEntry(errorLogEntry);
                }
            }
        }

        //
        // Found device so exit the loop and return.
        //

        break;
    }

    return;
}

Referenced by CreateDiskDeviceObject(), and DiskFdoProcessError().

DriverEntry()

NTSTATUS NTAPI DriverEntry	(	IN PDRIVER_OBJECT	DriverObject,
		IN PUNICODE_STRING	RegistryPath
	)

Definition at line 342 of file disk.c.

{
    CLASS_INIT_DATA InitializationData;

    //
    // Zero InitData
    //

    RtlZeroMemory (&InitializationData, sizeof(CLASS_INIT_DATA));

    //
    // Set sizes
    //

    InitializationData.InitializationDataSize = sizeof(CLASS_INIT_DATA);
    InitializationData.DeviceExtensionSize = DEVICE_EXTENSION_SIZE;

    InitializationData.DeviceType = FILE_DEVICE_DISK;
    InitializationData.DeviceCharacteristics = 0;

    //
    // Set entry points
    //

    InitializationData.ClassError = ScsiDiskProcessError;
    InitializationData.ClassReadWriteVerification = ScsiDiskReadWriteVerification;
    InitializationData.ClassFindDevices = FindScsiDisks;
    InitializationData.ClassFindDeviceCallBack = ScsiDiskDeviceVerification;
    InitializationData.ClassDeviceControl = ScsiDiskDeviceControl;
    InitializationData.ClassShutdownFlush = ScsiDiskShutdownFlush;
    InitializationData.ClassCreateClose = NULL;

    //
    // Call the class init routine
    //

    return ScsiClassInitialize( DriverObject, RegistryPath, &InitializationData);

} // end DriverEntry()

Referenced by ScsiDiskDeviceControl().

EnumerateBusKey()

BOOLEAN NTAPI EnumerateBusKey	(	IN PDEVICE_EXTENSION	DeviceExtension,
		HANDLE	BusKey,
		PULONG	DiskNumber
	)

Definition at line 3881 of file disk.c.

{
    PDISK_DATA        diskData = (PDISK_DATA)(DeviceExtension + 1);
    BOOLEAN           diskFound = FALSE;
    OBJECT_ATTRIBUTES objectAttributes;
    UNICODE_STRING    unicodeString;
    UNICODE_STRING    identifier;
    ULONG             busNumber;
    ULONG             adapterNumber;
    ULONG             diskNumber;
    HANDLE            adapterKey;
    HANDLE            spareKey;
    HANDLE            diskKey;
    HANDLE            targetKey;
    NTSTATUS          status;
    STRING            string;
    STRING            anotherString;
    ULONG             length;
    UCHAR             buffer[20];
    PKEY_VALUE_FULL_INFORMATION keyData;

    PAGED_CODE();

    for (busNumber = 0; ; busNumber++) {

        //
        // Open controller name key.
        //

        sprintf((PCHAR)buffer,
                "%lu",
                busNumber);

        RtlInitString(&string,
                      (PCSZ)buffer);

        status = RtlAnsiStringToUnicodeString(&unicodeString,
                                              &string,
                                              TRUE);

        if (!NT_SUCCESS(status)){
            break;
        }

        InitializeObjectAttributes(&objectAttributes,
                                   &unicodeString,
                                   OBJ_CASE_INSENSITIVE,
                                   BusKey,
                                   (PSECURITY_DESCRIPTOR)NULL);

        status = ZwOpenKey(&spareKey,
                           KEY_READ,
                           &objectAttributes);

        RtlFreeUnicodeString(&unicodeString);

        if (!NT_SUCCESS(status)) {
            break;
        }

        //
        // Open up controller ordinal key.
        //

        RtlInitUnicodeString(&unicodeString, L"DiskController");
        InitializeObjectAttributes(&objectAttributes,
                                   &unicodeString,
                                   OBJ_CASE_INSENSITIVE,
                                   spareKey,
                                   (PSECURITY_DESCRIPTOR)NULL);

        status = ZwOpenKey(&adapterKey,
                           KEY_READ,
                           &objectAttributes);

        //
        // This could fail even with additional adapters of this type
        // to search.
        //

        if (!NT_SUCCESS(status)) {
            continue;
        }

        for (adapterNumber = 0; ; adapterNumber++) {

            //
            // Open disk key.
            //

            sprintf((PCHAR)buffer,
                    "%lu\\DiskPeripheral",
                    adapterNumber);

            RtlInitString(&string,
                          (PCSZ)buffer);

            status = RtlAnsiStringToUnicodeString(&unicodeString,
                                                  &string,
                                                  TRUE);

            if (!NT_SUCCESS(status)){
                break;
            }

            InitializeObjectAttributes(&objectAttributes,
                                       &unicodeString,
                                       OBJ_CASE_INSENSITIVE,
                                       adapterKey,
                                       (PSECURITY_DESCRIPTOR)NULL);

            status = ZwOpenKey(&diskKey,
                               KEY_READ,
                               &objectAttributes);

            RtlFreeUnicodeString(&unicodeString);

            if (!NT_SUCCESS(status)) {
                break;
            }

            for (diskNumber = 0; ; diskNumber++) {

                sprintf((PCHAR)buffer,
                        "%lu",
                        diskNumber);

                RtlInitString(&string,
                              (PCSZ)buffer);

                status = RtlAnsiStringToUnicodeString(&unicodeString,
                                                      &string,
                                                      TRUE);

                if (!NT_SUCCESS(status)){
                    break;
                }

                InitializeObjectAttributes(&objectAttributes,
                                           &unicodeString,
                                           OBJ_CASE_INSENSITIVE,
                                           diskKey,
                                           (PSECURITY_DESCRIPTOR)NULL);

                status = ZwOpenKey(&targetKey,
                                   KEY_READ,
                                   &objectAttributes);

                RtlFreeUnicodeString(&unicodeString);

                if (!NT_SUCCESS(status)) {
                    break;
                }

                //
                // Allocate buffer for registry query.
                //

                keyData = ExAllocatePool(PagedPool, VALUE_BUFFER_SIZE);

                if (keyData == NULL) {
                    ZwClose(targetKey);
                    continue;
                }

                //
                // Get disk peripheral identifier.
                //

                RtlInitUnicodeString(&unicodeString, L"Identifier");
                status = ZwQueryValueKey(targetKey,
                                         &unicodeString,
                                         KeyValueFullInformation,
                                         keyData,
                                         VALUE_BUFFER_SIZE,
                                         &length);

                ZwClose(targetKey);

                if (!NT_SUCCESS(status)) {
                    ExFreePool(keyData);
                    continue;
                }

                if (keyData->DataLength < 9*sizeof(WCHAR)) {
                    //
                    // the data is too short to use (we subtract 9 chars in normal path)
                    //
                    DebugPrint((1, "EnumerateBusKey: Saved data was invalid, "
                                "not enough data in registry!\n"));
                    ExFreePool(keyData);
                    continue;
                }

                //
                // Complete unicode string.
                //

                identifier.Buffer =
                    (PWSTR)((PUCHAR)keyData + keyData->DataOffset);
                identifier.Length = (USHORT)keyData->DataLength;
                identifier.MaximumLength = (USHORT)keyData->DataLength;

                //
                // Convert unicode identifier to ansi string.
                //

                status =
                    RtlUnicodeStringToAnsiString(&anotherString,
                                                 &identifier,
                                                 TRUE);

                if (!NT_SUCCESS(status)) {
                    ExFreePool(keyData);
                    continue;
                }

                //
                // If checksum is zero, then the MBR is valid and
                // the signature is meaningful.
                //

                if (diskData->MbrCheckSum) {

                    //
                    // Convert checksum to ansi string.
                    //

                    sprintf((PCHAR)buffer, "%08lx", diskData->MbrCheckSum);

                } else {

                    //
                    // Convert signature to ansi string.
                    //

                    sprintf((PCHAR)buffer, "%08lx", diskData->Signature);

                    //
                    // Make string point at signature. Can't use scan
                    // functions because they are not exported for driver use.
                    //

                    anotherString.Buffer+=9;
                }

                //
                // Convert to ansi string.
                //

                RtlInitString(&string,
                              (PCSZ)buffer);


                //
                // Make string lengths equal.
                //

                anotherString.Length = string.Length;

                //
                // Check if strings match.
                //

                if (RtlCompareString(&string,
                                     &anotherString,
                                     TRUE) == 0)  {

                    diskFound = TRUE;
                    *DiskNumber = diskNumber;
                }

                ExFreePool(keyData);

                //
                // Readjust identifier string if necessary.
                //

                if (!diskData->MbrCheckSum) {
                    anotherString.Buffer-=9;
                }

                RtlFreeAnsiString(&anotherString);

                if (diskFound) {
                    break;
                }
            }

            ZwClose(diskKey);
        }

        ZwClose(adapterKey);
    }

    ZwClose(BusKey);
    return diskFound;

} // end EnumerateBusKey()

Referenced by UpdateGeometry().

FindScsiDisks()

BOOLEAN NTAPI FindScsiDisks	(	IN PDRIVER_OBJECT	DriveObject,
		IN PUNICODE_STRING	RegistryPath,
		IN PCLASS_INIT_DATA	InitializationData,
		IN PDEVICE_OBJECT	PortDeviceObject,
		IN ULONG	PortNumber
	)

Definition at line 443 of file disk.c.

{
    PIO_SCSI_CAPABILITIES portCapabilities;
    PULONG diskCount;
    PCONFIGURATION_INFORMATION configurationInformation;
    PCHAR buffer;
    PSCSI_INQUIRY_DATA lunInfo;
    PSCSI_ADAPTER_BUS_INFO  adapterInfo;
    PINQUIRYDATA inquiryData;
    ULONG scsiBus;
    ULONG adapterDisk;
    NTSTATUS status;
    BOOLEAN foundOne = FALSE;

    PAGED_CODE();

    //
    // Call port driver to get adapter capabilities.
    //

    status = ScsiClassGetCapabilities(PortDeviceObject, &portCapabilities);

    if (!NT_SUCCESS(status)) {
        DebugPrint((1,"FindScsiDevices: ScsiClassGetCapabilities failed\n"));
        return(FALSE);
    }

    //
    // Call port driver to get inquiry information to find disks.
    //

    status = ScsiClassGetInquiryData(PortDeviceObject, (PSCSI_ADAPTER_BUS_INFO *) &buffer);

    if (!NT_SUCCESS(status)) {
        DebugPrint((1,"FindScsiDevices: ScsiClassGetInquiryData failed\n"));
        return(FALSE);
    }

    //
    // Do a quick scan of the devices on this adapter to determine how many
    // disks are on this adapter.  This is used to determine the number of
    // SRB zone elements to allocate.
    //

    adapterInfo = (PVOID) buffer;

    adapterDisk = ScsiClassFindUnclaimedDevices(InitializationData, adapterInfo);

    //
    // Allocate a zone of SRB for disks on this adapter.
    //

    if (adapterDisk == 0) {

        //
        // No free disks were found.
        //

        return(FALSE);
    }

    //
    // Get the number of disks already initialized.
    //

    configurationInformation = IoGetConfigurationInformation();
    diskCount = &configurationInformation->DiskCount;

    //
    // For each SCSI bus this adapter supports ...
    //

    for (scsiBus=0; scsiBus < (ULONG)adapterInfo->NumberOfBuses; scsiBus++) {

        //
        // Get the SCSI bus scan data for this bus.
        //

        lunInfo = (PVOID) (buffer + adapterInfo->BusData[scsiBus].InquiryDataOffset);

        //
        // Search list for unclaimed disk devices.
        //

        while (adapterInfo->BusData[scsiBus].InquiryDataOffset) {

            inquiryData = (PVOID)lunInfo->InquiryData;

            if (((inquiryData->DeviceType == DIRECT_ACCESS_DEVICE) ||
                (inquiryData->DeviceType == OPTICAL_DEVICE)) &&
                inquiryData->DeviceTypeQualifier == 0 &&
                (!lunInfo->DeviceClaimed)) {

                DebugPrint((1,
                            "FindScsiDevices: Vendor string is %.24s\n",
                            inquiryData->VendorId));

                //
                // Create device objects for disk
                //

                status = CreateDiskDeviceObject(DriverObject,
                                                RegistryPath,
                                                PortDeviceObject,
                                                PortNumber,
                                                diskCount,
                                                portCapabilities,
                                                lunInfo,
                                                InitializationData);

                if (NT_SUCCESS(status)) {

                    //
                    // Increment system disk device count.
                    //

                    (*diskCount)++;
                    foundOne = TRUE;

                }
            }

            //
            // Get next LunInfo.
            //

            if (lunInfo->NextInquiryDataOffset == 0) {
                break;
            }

            lunInfo = (PVOID) (buffer + lunInfo->NextInquiryDataOffset);

        }
    }

    //
    // Buffer is allocated by ScsiClassGetInquiryData and must be free returning.
    //

    ExFreePool(buffer);

    return(foundOne);

} // end FindScsiDisks()

Referenced by DriverEntry().

IsFloppyDevice() [1/2]

BOOLEAN NTAPI IsFloppyDevice

(

IN PDEVICE_OBJECT

DeviceObject

)

Referenced by CreateDiskDeviceObject().

IsFloppyDevice() [2/2]

BOOLEAN NTAPI IsFloppyDevice

(

PDEVICE_OBJECT

DeviceObject

)

Definition at line 3276 of file disk.c.

{
    PDEVICE_EXTENSION deviceExtension = DeviceObject->DeviceExtension;
    PVOID modeData;
    PUCHAR pageData;
    ULONG length;

    PAGED_CODE();

    modeData = ExAllocatePool(NonPagedPoolCacheAligned, MODE_DATA_SIZE);

    if (modeData == NULL) {
        return(FALSE);
    }

    RtlZeroMemory(modeData, MODE_DATA_SIZE);

    length = ScsiClassModeSense(DeviceObject,
                                modeData,
                                MODE_DATA_SIZE,
                                MODE_SENSE_RETURN_ALL);

    if (length < sizeof(MODE_PARAMETER_HEADER)) {

        //
        // Retry the request in case of a check condition.
        //

        length = ScsiClassModeSense(DeviceObject,
                                modeData,
                                MODE_DATA_SIZE,
                                MODE_SENSE_RETURN_ALL);

        if (length < sizeof(MODE_PARAMETER_HEADER)) {

            ExFreePool(modeData);
            return(FALSE);

        }
    }

    //
    // If the length is greater than length indicated by the mode data reset
    // the data to the mode data.
    //

    if (length > (ULONG) ((PMODE_PARAMETER_HEADER) modeData)->ModeDataLength + 1) {
        length = ((PMODE_PARAMETER_HEADER) modeData)->ModeDataLength + 1;
    }

    //
    // Look for the flexible disk mode page.
    //

    pageData = ScsiClassFindModePage( modeData, length, MODE_PAGE_FLEXIBILE, TRUE);

    if (pageData != NULL) {

        DebugPrint((1, "Scsidisk: Flexible disk page found, This is a floppy.\n"));
        ExFreePool(modeData);
        return(TRUE);
    }

    //
    // Check to see if the write cache is enabled.
    //

    pageData = ScsiClassFindModePage( modeData, length, MODE_PAGE_CACHING, TRUE);

    //
    // Assume that write cache is disabled or not supported.
    //

    deviceExtension->DeviceFlags &= ~DEV_WRITE_CACHE;

    //
    // Check if valid caching page exists.
    //

    if (pageData != NULL) {

        //
        // Check if write cache is disabled.
        //

        if (((PMODE_CACHING_PAGE)pageData)->WriteCacheEnable) {

            DebugPrint((1,
                       "SCSIDISK: Disk write cache enabled\n"));

            //
            // Check if forced unit access (FUA) is supported.
            //

            if (((PMODE_PARAMETER_HEADER)modeData)->DeviceSpecificParameter & MODE_DSP_FUA_SUPPORTED) {

                deviceExtension->DeviceFlags |= DEV_WRITE_CACHE;

            } else {

                DebugPrint((1,
                           "SCSIDISK: Disk does not support FUA or DPO\n"));

                //
                // TODO: Log this.
                //

            }
        }
    }

    ExFreePool(modeData);
    return(FALSE);

} // end IsFloppyDevice()

Referenced by ScsiFlopInitDevice().

ReportToMountMgr()

VOID NTAPI ReportToMountMgr

(

IN PDEVICE_OBJECT

DiskDeviceObject

)

Definition at line 1073 of file disk.c.

{
    NTSTATUS              status;
    UNICODE_STRING        mountMgrDevice;
    PDEVICE_OBJECT        deviceObject;
    PFILE_OBJECT          fileObject;
    PMOUNTMGR_TARGET_NAME mountTarget;
    ULONG                 diskLen;
    PDEVICE_EXTENSION     deviceExtension;
    PIRP                  irp;
    KEVENT                event;
    IO_STATUS_BLOCK       ioStatus;

    //
    // First, get MountMgr DeviceObject.
    //

    RtlInitUnicodeString(&mountMgrDevice, MOUNTMGR_DEVICE_NAME);
    status = IoGetDeviceObjectPointer(&mountMgrDevice, FILE_READ_ATTRIBUTES,
                                      &fileObject, &deviceObject);

    if (!NT_SUCCESS(status)) {

        DebugPrint((1,
                   "ReportToMountMgr: Can't get MountMgr pointers %lx\n",
                   status));

        return;
    }

    deviceExtension = DiskDeviceObject->DeviceExtension;
    diskLen = deviceExtension->DeviceName.Length;

    //
    // Allocate input buffer to report our partition device.
    //

    mountTarget = ExAllocatePool(NonPagedPool,
                                 sizeof(MOUNTMGR_TARGET_NAME) + diskLen);

    if (!mountTarget) {

        DebugPrint((1,
                   "ReportToMountMgr: Allocation of mountTarget failed\n"));

        ObDereferenceObject(fileObject);
        return;
    }

    mountTarget->DeviceNameLength = diskLen;
    RtlCopyMemory(mountTarget->DeviceName, deviceExtension->DeviceName.Buffer, diskLen);

    KeInitializeEvent(&event, NotificationEvent, FALSE);

    //
    // Build the IRP used to communicate with the MountMgr.
    //

    irp = IoBuildDeviceIoControlRequest(IOCTL_MOUNTMGR_VOLUME_ARRIVAL_NOTIFICATION,
                                        deviceObject,
                                        mountTarget,
                                        sizeof(MOUNTMGR_TARGET_NAME) + diskLen,
                                        NULL,
                                        0,
                                        FALSE,
                                        &event,
                                        &ioStatus);

    if (!irp) {

        DebugPrint((1,
                    "ReportToMountMgr: Allocation of irp failed\n"));

        ExFreePool(mountTarget);
        ObDereferenceObject(fileObject);
        return;
    }

    //
    // Call the MountMgr.
    //

    status = IoCallDriver(deviceObject, irp);

    if (status == STATUS_PENDING) {
        KeWaitForSingleObject(&event, Suspended, KernelMode, FALSE, NULL);
        status = ioStatus.Status;
    }

    //
    // We're done.
    //

    DPRINT1("Reported to the MountMgr: %lx\n", status);

    ExFreePool(mountTarget);
    ObDereferenceObject(fileObject);

    return;
}

Referenced by CreatePartitionDeviceObjects().

ResetScsiBus()

VOID NTAPI ResetScsiBus

(

IN PDEVICE_OBJECT

DeviceObject

)

Definition at line 4872 of file disk.c.

{
    PIO_STACK_LOCATION irpStack;
    PIRP irp;
    PDEVICE_EXTENSION deviceExtension = DeviceObject->DeviceExtension;
    PSCSI_REQUEST_BLOCK srb;
    PCOMPLETION_CONTEXT context;

    DebugPrint((1, "ScsiDisk ResetScsiBus: Sending reset bus request to port driver.\n"));

    //
    // Allocate Srb from nonpaged pool.
    //

    context = ExAllocatePool(NonPagedPoolMustSucceed,
                             sizeof(COMPLETION_CONTEXT));

    //
    // Save the device object in the context for use by the completion
    // routine.
    //

    context->DeviceObject = DeviceObject;
    srb = &context->Srb;

    //
    // Zero out srb.
    //

    RtlZeroMemory(srb, SCSI_REQUEST_BLOCK_SIZE);

    //
    // Write length to SRB.
    //

    srb->Length = SCSI_REQUEST_BLOCK_SIZE;

    //
    // Set up SCSI bus address.
    //

    srb->PathId = deviceExtension->PathId;
    srb->TargetId = deviceExtension->TargetId;
    srb->Lun = deviceExtension->Lun;

    srb->Function = SRB_FUNCTION_RESET_BUS;

    //
    // Build the asynchronous request to be sent to the port driver.
    // Since this routine is called from a DPC the IRP should always be
    // available.
    //

    irp = IoAllocateIrp(DeviceObject->StackSize, FALSE);

    IoSetCompletionRoutine(irp,
                           (PIO_COMPLETION_ROUTINE)ScsiClassAsynchronousCompletion,
                           context,
                           TRUE,
                           TRUE,
                           TRUE);

    irpStack = IoGetNextIrpStackLocation(irp);

    irpStack->MajorFunction = IRP_MJ_SCSI;

    srb->OriginalRequest = irp;

    //
    // Store the SRB address in next stack for port driver.
    //

    irpStack->Parameters.Scsi.Srb = srb;

    //
    // Call the port driver with the IRP.
    //

    IoCallDriver(deviceExtension->PortDeviceObject, irp);

    return;

} // end ResetScsiBus()

Referenced by ScsiDiskProcessError().

ScanForSpecial()

VOID NTAPI ScanForSpecial	(	PDEVICE_OBJECT	DeviceObject,
		PSCSI_INQUIRY_DATA	LunInfo,
		PIO_SCSI_CAPABILITIES	PortCapabilities
	)

Definition at line 4770 of file disk.c.

{
    PDEVICE_EXTENSION          deviceExtension = DeviceObject->DeviceExtension;
    PINQUIRYDATA               InquiryData     = (PINQUIRYDATA)LunInfo->InquiryData;
    BAD_CONTROLLER_INFORMATION const *controller;
    ULONG                      j;

    for (j = 0; j <  NUMBER_OF_BAD_CONTROLLERS; j++) {

        controller = &ScsiDiskBadControllers[j];

        if (strncmp(controller->InquiryString, (PCCHAR)InquiryData->VendorId, strlen(controller->InquiryString))) {
            continue;
        }

        DebugPrint((1, "ScsiDisk ScanForSpecial, Found bad controller! %s\n", controller->InquiryString));

        //
        // Found a listed controller.  Determine what must be done.
        //

        if (controller->DisableTaggedQueuing) {

            //
            // Disable tagged queuing.
            //

            deviceExtension->SrbFlags &= ~SRB_FLAGS_QUEUE_ACTION_ENABLE;
        }

        if (controller->DisableSynchronousTransfers) {

            //
            // Disable synchronous data transfers.
            //

            deviceExtension->SrbFlags |= SRB_FLAGS_DISABLE_SYNCH_TRANSFER;

        }

        if (controller->DisableDisconnects) {

            //
            // Disable disconnects.
            //

            deviceExtension->SrbFlags |= SRB_FLAGS_DISABLE_DISCONNECT;

        }

        //
        // Found device so exit the loop and return.
        //

        break;
    }

    //
    // Set the StartUnit flag appropriately.
    //

    if (DeviceObject->DeviceType == FILE_DEVICE_DISK) {
        deviceExtension->DeviceFlags |= DEV_SAFE_START_UNIT;

        if (DeviceObject->Characteristics & FILE_REMOVABLE_MEDIA) {
            if (_strnicmp((PCCHAR)InquiryData->VendorId, "iomega", strlen("iomega"))) {
                deviceExtension->DeviceFlags &= ~DEV_SAFE_START_UNIT;
            }
        }
    }

    return;
}

Referenced by CreateDiskDeviceObject().

ScsiDiskCreateClose()

NTSTATUS NTAPI ScsiDiskCreateClose	(	IN PDEVICE_OBJECT	DeviceObject,
		IN PIRP	Irp
	)

ScsiDiskDeviceControl() [1/2]

NTSTATUS NTAPI ScsiDiskDeviceControl	(	IN PDEVICE_OBJECT	DeviceObject,
		IN PIRP	Irp
	)

Referenced by DriverEntry().

ScsiDiskDeviceControl() [2/2]

NTSTATUS NTAPI ScsiDiskDeviceControl	(	PDEVICE_OBJECT	DeviceObject,
		PIRP	Irp
	)

Definition at line 1733 of file disk.c.

{
    PIO_STACK_LOCATION     irpStack = IoGetCurrentIrpStackLocation(Irp);
    PDEVICE_EXTENSION      deviceExtension = DeviceObject->DeviceExtension;
    PDISK_DATA             diskData = (PDISK_DATA)(deviceExtension + 1);
    PSCSI_REQUEST_BLOCK    srb;
    PCDB                   cdb;
    PMODE_PARAMETER_HEADER modeData;
    PIRP                   irp2;
    ULONG                  length;
    NTSTATUS               status;
    KEVENT                 event;
    IO_STATUS_BLOCK        ioStatus;

    PAGED_CODE();

    srb = ExAllocatePool(NonPagedPool, SCSI_REQUEST_BLOCK_SIZE);

    if (srb == NULL) {

        Irp->IoStatus.Status = STATUS_INSUFFICIENT_RESOURCES;
        IoCompleteRequest(Irp, IO_NO_INCREMENT);
        return(STATUS_INSUFFICIENT_RESOURCES);
    }

    //
    // Write zeros to Srb.
    //

    RtlZeroMemory(srb, SCSI_REQUEST_BLOCK_SIZE);

    cdb = (PCDB)srb->Cdb;

    switch (irpStack->Parameters.DeviceIoControl.IoControlCode) {

    case SMART_GET_VERSION: {

        ULONG_PTR buffer;
        PSRB_IO_CONTROL  srbControl;
        PGETVERSIONINPARAMS versionParams;

        if (irpStack->Parameters.DeviceIoControl.OutputBufferLength <
            sizeof(GETVERSIONINPARAMS)) {
                status = STATUS_INVALID_PARAMETER;
                break;
        }

        //
        // Create notification event object to be used to signal the
        // request completion.
        //

        KeInitializeEvent(&event, NotificationEvent, FALSE);

        srbControl = ExAllocatePool(NonPagedPool,
                                    sizeof(SRB_IO_CONTROL) + sizeof(GETVERSIONINPARAMS));

        if (!srbControl) {
            status =  STATUS_INSUFFICIENT_RESOURCES;
            break;
        }

        //
        // fill in srbControl fields
        //

        srbControl->HeaderLength = sizeof(SRB_IO_CONTROL);
        RtlMoveMemory (srbControl->Signature, "SCSIDISK", 8);
        srbControl->Timeout = deviceExtension->TimeOutValue;
        srbControl->Length = sizeof(GETVERSIONINPARAMS);
        srbControl->ControlCode = IOCTL_SCSI_MINIPORT_SMART_VERSION;

        //
        // Point to the 'buffer' portion of the SRB_CONTROL
        //

        buffer = (ULONG_PTR)srbControl + srbControl->HeaderLength;

        //
        // Ensure correct target is set in the cmd parameters.
        //

        versionParams = (PGETVERSIONINPARAMS)buffer;
        versionParams->bIDEDeviceMap = deviceExtension->TargetId;

        //
        // Copy the IOCTL parameters to the srb control buffer area.
        //

        RtlMoveMemory((PVOID)buffer, Irp->AssociatedIrp.SystemBuffer, sizeof(GETVERSIONINPARAMS));


        irp2 = IoBuildDeviceIoControlRequest(IOCTL_SCSI_MINIPORT,
                                            deviceExtension->PortDeviceObject,
                                            srbControl,
                                            sizeof(SRB_IO_CONTROL) + sizeof(GETVERSIONINPARAMS),
                                            srbControl,
                                            sizeof(SRB_IO_CONTROL) + sizeof(GETVERSIONINPARAMS),
                                            FALSE,
                                            &event,
                                            &ioStatus);

        if (irp2 == NULL) {
            status = STATUS_INSUFFICIENT_RESOURCES;
            break;
        }

        //
        // Call the port driver with the request and wait for it to complete.
        //

        status = IoCallDriver(deviceExtension->PortDeviceObject, irp2);

        if (status == STATUS_PENDING) {
            KeWaitForSingleObject(&event, Suspended, KernelMode, FALSE, NULL);
            status = ioStatus.Status;
        }

        //
        // If successful, copy the data received into the output buffer.
        // This should only fail in the event that the IDE driver is older than this driver.
        //

        if (NT_SUCCESS(status)) {

            buffer = (ULONG_PTR)srbControl + srbControl->HeaderLength;

            RtlMoveMemory ( Irp->AssociatedIrp.SystemBuffer, (PVOID)buffer, sizeof(GETVERSIONINPARAMS));
            Irp->IoStatus.Information = sizeof(GETVERSIONINPARAMS);
        }

        ExFreePool(srbControl);
        break;
    }

    case SMART_RCV_DRIVE_DATA: {

        PSENDCMDINPARAMS cmdInParameters = ((PSENDCMDINPARAMS)Irp->AssociatedIrp.SystemBuffer);
        ULONG            controlCode = 0;
        PSRB_IO_CONTROL  srbControl;
        ULONG_PTR        buffer;

        if (irpStack->Parameters.DeviceIoControl.InputBufferLength <
            (sizeof(SENDCMDINPARAMS) - 1)) {
                status = STATUS_INVALID_PARAMETER;
                break;

        } else if (irpStack->Parameters.DeviceIoControl.OutputBufferLength <
            (sizeof(SENDCMDOUTPARAMS) + 512 - 1)) {
                status = STATUS_INVALID_PARAMETER;
                break;
        }

        //
        // Create notification event object to be used to signal the
        // request completion.
        //

        KeInitializeEvent(&event, NotificationEvent, FALSE);

        if (cmdInParameters->irDriveRegs.bCommandReg == ID_CMD) {

            length = IDENTIFY_BUFFER_SIZE + sizeof(SENDCMDOUTPARAMS);
            controlCode = IOCTL_SCSI_MINIPORT_IDENTIFY;

        } else if (cmdInParameters->irDriveRegs.bCommandReg == SMART_CMD) {
            switch (cmdInParameters->irDriveRegs.bFeaturesReg) {
                case READ_ATTRIBUTES:
                    controlCode = IOCTL_SCSI_MINIPORT_READ_SMART_ATTRIBS;
                    length = READ_ATTRIBUTE_BUFFER_SIZE + sizeof(SENDCMDOUTPARAMS);
                    break;
                case READ_THRESHOLDS:
                    controlCode = IOCTL_SCSI_MINIPORT_READ_SMART_THRESHOLDS;
                    length = READ_THRESHOLD_BUFFER_SIZE + sizeof(SENDCMDOUTPARAMS);
                    break;
                default:
                    status = STATUS_INVALID_PARAMETER;
                    break;
            }
        } else {

            status = STATUS_INVALID_PARAMETER;
        }

        if (controlCode == 0) {
            status = STATUS_INVALID_PARAMETER;
            break;
        }

        srbControl = ExAllocatePool(NonPagedPool,
                                    sizeof(SRB_IO_CONTROL) + length);

        if (!srbControl) {
            status =  STATUS_INSUFFICIENT_RESOURCES;
            break;
        }

        //
        // fill in srbControl fields
        //

        srbControl->HeaderLength = sizeof(SRB_IO_CONTROL);
        RtlMoveMemory (srbControl->Signature, "SCSIDISK", 8);
        srbControl->Timeout = deviceExtension->TimeOutValue;
        srbControl->Length = length;
        srbControl->ControlCode = controlCode;

        //
        // Point to the 'buffer' portion of the SRB_CONTROL
        //

        buffer = (ULONG_PTR)srbControl + srbControl->HeaderLength;

        //
        // Ensure correct target is set in the cmd parameters.
        //

        cmdInParameters->bDriveNumber = deviceExtension->TargetId;

        //
        // Copy the IOCTL parameters to the srb control buffer area.
        //

        RtlMoveMemory((PVOID)buffer, Irp->AssociatedIrp.SystemBuffer, sizeof(SENDCMDINPARAMS) - 1);

        irp2 = IoBuildDeviceIoControlRequest(IOCTL_SCSI_MINIPORT,
                                            deviceExtension->PortDeviceObject,
                                            srbControl,
                                            sizeof(SRB_IO_CONTROL) + sizeof(SENDCMDINPARAMS) - 1,
                                            srbControl,
                                            sizeof(SRB_IO_CONTROL) + length,
                                            FALSE,
                                            &event,
                                            &ioStatus);

        if (irp2 == NULL) {
            status = STATUS_INSUFFICIENT_RESOURCES;
            break;
        }

        //
        // Call the port driver with the request and wait for it to complete.
        //

        status = IoCallDriver(deviceExtension->PortDeviceObject, irp2);

        if (status == STATUS_PENDING) {
            KeWaitForSingleObject(&event, Suspended, KernelMode, FALSE, NULL);
            status = ioStatus.Status;
        }

        //
        // If successful, copy the data received into the output buffer
        //

        buffer = (ULONG_PTR)srbControl + srbControl->HeaderLength;

        if (NT_SUCCESS(status)) {

            RtlMoveMemory ( Irp->AssociatedIrp.SystemBuffer, (PVOID)buffer, length - 1);
            Irp->IoStatus.Information = length - 1;

        } else {

            RtlMoveMemory ( Irp->AssociatedIrp.SystemBuffer, (PVOID)buffer, (sizeof(SENDCMDOUTPARAMS) - 1));
            Irp->IoStatus.Information = sizeof(SENDCMDOUTPARAMS) - 1;

        }

        ExFreePool(srbControl);
        break;

    }

    case SMART_SEND_DRIVE_COMMAND: {

        PSENDCMDINPARAMS cmdInParameters = ((PSENDCMDINPARAMS)Irp->AssociatedIrp.SystemBuffer);
        PSRB_IO_CONTROL  srbControl;
        ULONG            controlCode = 0;
        ULONG_PTR        buffer;

        if (irpStack->Parameters.DeviceIoControl.InputBufferLength <
               (sizeof(SENDCMDINPARAMS) - 1)) {
                status = STATUS_INVALID_PARAMETER;
                break;

        } else if (irpStack->Parameters.DeviceIoControl.OutputBufferLength <
                      (sizeof(SENDCMDOUTPARAMS) - 1)) {
                status = STATUS_INVALID_PARAMETER;
                break;
        }

        //
        // Create notification event object to be used to signal the
        // request completion.
        //

        KeInitializeEvent(&event, NotificationEvent, FALSE);

        length = 0;

        if (cmdInParameters->irDriveRegs.bCommandReg == SMART_CMD) {
            switch (cmdInParameters->irDriveRegs.bFeaturesReg) {

                case ENABLE_SMART:
                    controlCode = IOCTL_SCSI_MINIPORT_ENABLE_SMART;
                    break;

                case DISABLE_SMART:
                    controlCode = IOCTL_SCSI_MINIPORT_DISABLE_SMART;
                    break;

                case  RETURN_SMART_STATUS:

                    //
                    // Ensure bBuffer is at least 2 bytes (to hold the values of
                    // cylinderLow and cylinderHigh).
                    //

                    if (irpStack->Parameters.DeviceIoControl.OutputBufferLength <
                        (sizeof(SENDCMDOUTPARAMS) - 1 + sizeof(IDEREGS))) {

                        status = STATUS_INVALID_PARAMETER;
                        break;
                    }

                    controlCode = IOCTL_SCSI_MINIPORT_RETURN_STATUS;
                    length = sizeof(IDEREGS);
                    break;

                case ENABLE_DISABLE_AUTOSAVE:
                    controlCode = IOCTL_SCSI_MINIPORT_ENABLE_DISABLE_AUTOSAVE;
                    break;

                case SAVE_ATTRIBUTE_VALUES:
                    controlCode = IOCTL_SCSI_MINIPORT_SAVE_ATTRIBUTE_VALUES;
                    break;

                case EXECUTE_OFFLINE_DIAGS:
                    controlCode = IOCTL_SCSI_MINIPORT_EXECUTE_OFFLINE_DIAGS;
                    break;

          default:
                    status = STATUS_INVALID_PARAMETER;
                    break;
            }
        } else {

            status = STATUS_INVALID_PARAMETER;
        }

        if (controlCode == 0) {
            status = STATUS_INVALID_PARAMETER;
            break;
        }

        length += (sizeof(SENDCMDOUTPARAMS) > sizeof(SENDCMDINPARAMS)) ? sizeof(SENDCMDOUTPARAMS) : sizeof(SENDCMDINPARAMS);
        srbControl = ExAllocatePool(NonPagedPool,
                                    sizeof(SRB_IO_CONTROL) + length);

        if (!srbControl) {
            status =  STATUS_INSUFFICIENT_RESOURCES;
            break;
        }

        //
        // fill in srbControl fields
        //

        srbControl->HeaderLength = sizeof(SRB_IO_CONTROL);
        RtlMoveMemory (srbControl->Signature, "SCSIDISK", 8);
        srbControl->Timeout = deviceExtension->TimeOutValue;
        srbControl->Length = length;

        //
        // Point to the 'buffer' portion of the SRB_CONTROL
        //

        buffer = (ULONG_PTR)srbControl + srbControl->HeaderLength;

        //
        // Ensure correct target is set in the cmd parameters.
        //

        cmdInParameters->bDriveNumber = deviceExtension->TargetId;

        //
        // Copy the IOCTL parameters to the srb control buffer area.
        //

        RtlMoveMemory((PVOID)buffer, Irp->AssociatedIrp.SystemBuffer, sizeof(SENDCMDINPARAMS) - 1);

        srbControl->ControlCode = controlCode;

        irp2 = IoBuildDeviceIoControlRequest(IOCTL_SCSI_MINIPORT,
                                            deviceExtension->PortDeviceObject,
                                            srbControl,
                                            sizeof(SRB_IO_CONTROL) + sizeof(SENDCMDINPARAMS) - 1,
                                            srbControl,
                                            sizeof(SRB_IO_CONTROL) + length,
                                            FALSE,
                                            &event,
                                            &ioStatus);

        if (irp2 == NULL) {
            status = STATUS_INSUFFICIENT_RESOURCES;
            break;
        }

        //
        // Call the port driver with the request and wait for it to complete.
        //

        status = IoCallDriver(deviceExtension->PortDeviceObject, irp2);

        if (status == STATUS_PENDING) {
            KeWaitForSingleObject(&event, Suspended, KernelMode, FALSE, NULL);
            status = ioStatus.Status;
        }

        //
        // Copy the data received into the output buffer. Since the status buffer
        // contains error information also, always perform this copy. IO will will
        // either pass this back to the app, or zero it, in case of error.
        //

        buffer = (ULONG_PTR)srbControl + srbControl->HeaderLength;

        //
        // Update the return buffer size based on the sub-command.
        //

        if (cmdInParameters->irDriveRegs.bFeaturesReg == RETURN_SMART_STATUS) {
            length = sizeof(SENDCMDOUTPARAMS) - 1 + sizeof(IDEREGS);
        } else {
            length = sizeof(SENDCMDOUTPARAMS) - 1;
        }

        RtlMoveMemory ( Irp->AssociatedIrp.SystemBuffer, (PVOID)buffer, length);
        Irp->IoStatus.Information = length;

        ExFreePool(srbControl);
        break;

    }

    case IOCTL_DISK_GET_DRIVE_GEOMETRY:
    case IOCTL_DISK_GET_DRIVE_GEOMETRY_EX:
        {

        PDEVICE_EXTENSION physicalDeviceExtension;
        PDISK_DATA        physicalDiskData;
        BOOLEAN           removable = FALSE;
        BOOLEAN           listInitialized = FALSE;
        ULONG             copyLength;

        if (irpStack->Parameters.DeviceIoControl.IoControlCode == IOCTL_DISK_GET_DRIVE_GEOMETRY) {
            if (irpStack->Parameters.DeviceIoControl.OutputBufferLength < sizeof(DISK_GEOMETRY)) {
                status = STATUS_BUFFER_TOO_SMALL;
                break;
            }

            copyLength = sizeof(DISK_GEOMETRY);
        } else {
            ASSERT(irpStack->Parameters.DeviceIoControl.IoControlCode == IOCTL_DISK_GET_DRIVE_GEOMETRY_EX);
            if (irpStack->Parameters.DeviceIoControl.OutputBufferLength < FIELD_OFFSET(DISK_GEOMETRY_EX, Data)) {
                status = STATUS_BUFFER_TOO_SMALL;
                break;
            }

            if (irpStack->Parameters.DeviceIoControl.OutputBufferLength >= sizeof(DISK_GEOMETRY_EX)) {
                copyLength = sizeof(DISK_GEOMETRY_EX);
            } else {
                copyLength = FIELD_OFFSET(DISK_GEOMETRY_EX, Data);
            }
        }

        status = STATUS_SUCCESS;

        physicalDeviceExtension = deviceExtension->PhysicalDevice->DeviceExtension;
        physicalDiskData = (PDISK_DATA)(physicalDeviceExtension + 1);

        removable = (BOOLEAN)DeviceObject->Characteristics & FILE_REMOVABLE_MEDIA;
        listInitialized = (physicalDiskData->PartitionListState == Initialized);

        if (removable || (!listInitialized))
        {
            //
            // Issue ReadCapacity to update device extension
            // with information for current media.
            //

            status = ScsiClassReadDriveCapacity(deviceExtension->PhysicalDevice);

        }

        if (removable) {

            if (!NT_SUCCESS(status)) {

                //
                // Note the drive is not ready.
                //

                diskData->DriveNotReady = TRUE;

                break;
            }

            //
            // Note the drive is now ready.
            //

            diskData->DriveNotReady = FALSE;

        } else if (NT_SUCCESS(status)) {

            // ReadDriveCapacity was alright, create Partition Objects

            if (physicalDiskData->PartitionListState == NotInitialized) {
                    status = CreatePartitionDeviceObjects(deviceExtension->PhysicalDevice, NULL);
            }
        }

        if (NT_SUCCESS(status)) {

            //
            // Copy drive geometry information from device extension.
            //

            RtlMoveMemory(Irp->AssociatedIrp.SystemBuffer,
                          deviceExtension->DiskGeometry,
                          copyLength);

            status = STATUS_SUCCESS;
            Irp->IoStatus.Information = copyLength;
        }

        break;

        }

    case IOCTL_DISK_VERIFY:

        {

        PVERIFY_INFORMATION verifyInfo = Irp->AssociatedIrp.SystemBuffer;
        LARGE_INTEGER byteOffset;
        ULONG         sectorOffset;
        USHORT        sectorCount;

        //
        // Validate buffer length.
        //

        if (irpStack->Parameters.DeviceIoControl.InputBufferLength <
            sizeof(VERIFY_INFORMATION)) {

            status = STATUS_INFO_LENGTH_MISMATCH;
            break;
        }

        //
        // Verify sectors
        //

        srb->CdbLength = 10;

        cdb->CDB10.OperationCode = SCSIOP_VERIFY;

        //
        // Add disk offset to starting sector.
        //

        byteOffset.QuadPart = deviceExtension->StartingOffset.QuadPart +
                                        verifyInfo->StartingOffset.QuadPart;

        //
        // Convert byte offset to sector offset.
        //

        sectorOffset = (ULONG)(byteOffset.QuadPart >> deviceExtension->SectorShift);

        //
        // Convert ULONG byte count to USHORT sector count.
        //

        sectorCount = (USHORT)(verifyInfo->Length >> deviceExtension->SectorShift);

        //
        // Move little endian values into CDB in big endian format.
        //

        cdb->CDB10.LogicalBlockByte0 = ((PFOUR_BYTE)&sectorOffset)->Byte3;
        cdb->CDB10.LogicalBlockByte1 = ((PFOUR_BYTE)&sectorOffset)->Byte2;
        cdb->CDB10.LogicalBlockByte2 = ((PFOUR_BYTE)&sectorOffset)->Byte1;
        cdb->CDB10.LogicalBlockByte3 = ((PFOUR_BYTE)&sectorOffset)->Byte0;

        cdb->CDB10.TransferBlocksMsb = ((PFOUR_BYTE)&sectorCount)->Byte1;
        cdb->CDB10.TransferBlocksLsb = ((PFOUR_BYTE)&sectorCount)->Byte0;

        //
        // The verify command is used by the NT FORMAT utility and
        // requests are sent down for 5% of the volume size. The
        // request timeout value is calculated based on the number of
        // sectors verified.
        //

        srb->TimeOutValue = ((sectorCount + 0x7F) >> 7) *
                                              deviceExtension->TimeOutValue;

        status = ScsiClassSendSrbAsynchronous(DeviceObject,
                                              srb,
                                              Irp,
                                              NULL,
                                              0,
                                              FALSE);

        return(status);

        }

    case IOCTL_DISK_GET_PARTITION_INFO:

        //
        // Return the information about the partition specified by the device
        // object.  Note that no information is ever returned about the size
        // or partition type of the physical disk, as this doesn't make any
        // sense.
        //

        if (irpStack->Parameters.DeviceIoControl.OutputBufferLength <
            sizeof(PARTITION_INFORMATION)) {

            status = STATUS_INFO_LENGTH_MISMATCH;
            break;
        }

        //
        // Update the geometry in case it has changed.
        //

        status = UpdateRemovableGeometry (DeviceObject, Irp);

        if (!NT_SUCCESS(status)) {

            //
            // Note the drive is not ready.
            //

            diskData->DriveNotReady = TRUE;
            break;
        }

        //
        // Note the drive is now ready.
        //

        diskData->DriveNotReady = FALSE;

        //
        // Handle the case were we query the whole disk
        //

        if (diskData->PartitionNumber == 0) {

            PPARTITION_INFORMATION outputBuffer;

            outputBuffer =
                    (PPARTITION_INFORMATION)Irp->AssociatedIrp.SystemBuffer;

            outputBuffer->PartitionType = PARTITION_ENTRY_UNUSED;
            outputBuffer->StartingOffset = deviceExtension->StartingOffset;
            outputBuffer->PartitionLength.QuadPart = deviceExtension->PartitionLength.QuadPart;
            outputBuffer->HiddenSectors = 0;
            outputBuffer->PartitionNumber = diskData->PartitionNumber;
            outputBuffer->BootIndicator = FALSE;
            outputBuffer->RewritePartition = FALSE;
            outputBuffer->RecognizedPartition = FALSE;

            status = STATUS_SUCCESS;
            Irp->IoStatus.Information = sizeof(PARTITION_INFORMATION);

        } else {

            PPARTITION_INFORMATION outputBuffer;

            //
            // We query a single partition here
            // FIXME: this can only work for MBR-based disks, check for this!
            //

            outputBuffer =
                    (PPARTITION_INFORMATION)Irp->AssociatedIrp.SystemBuffer;

            outputBuffer->PartitionType = diskData->PartitionType;
            outputBuffer->StartingOffset = deviceExtension->StartingOffset;
            outputBuffer->PartitionLength.QuadPart = deviceExtension->PartitionLength.QuadPart;
            outputBuffer->HiddenSectors = diskData->HiddenSectors;
            outputBuffer->PartitionNumber = diskData->PartitionNumber;
            outputBuffer->BootIndicator = diskData->BootIndicator;
            outputBuffer->RewritePartition = FALSE;
            outputBuffer->RecognizedPartition =
                IsRecognizedPartition(diskData->PartitionType);

            status = STATUS_SUCCESS;
            Irp->IoStatus.Information = sizeof(PARTITION_INFORMATION);
        }

        break;

    case IOCTL_DISK_GET_PARTITION_INFO_EX:

        //
        // Return the information about the partition specified by the device
        // object.  Note that no information is ever returned about the size
        // or partition type of the physical disk, as this doesn't make any
        // sense.
        //

        if (irpStack->Parameters.DeviceIoControl.OutputBufferLength <
            sizeof(PARTITION_INFORMATION_EX)) {

            status = STATUS_INFO_LENGTH_MISMATCH;

        }
#if 0 // HACK: ReactOS partition numbers must be wrong
        else if (diskData->PartitionNumber == 0) {

            //
            // Partition zero is not a partition so this is not a
            // reasonable request.
            //

            status = STATUS_INVALID_DEVICE_REQUEST;

        }
#endif
        else {

            PPARTITION_INFORMATION_EX outputBuffer;

            if (diskData->PartitionNumber == 0) {
                DPRINT1("HACK: Handling partition 0 request!\n");
                //ASSERT(FALSE);
            }

            //
            // Update the geometry in case it has changed.
            //

            status = UpdateRemovableGeometry (DeviceObject, Irp);

            if (!NT_SUCCESS(status)) {

                //
                // Note the drive is not ready.
                //

                diskData->DriveNotReady = TRUE;
                break;
            }

            //
            // Note the drive is now ready.
            //

            diskData->DriveNotReady = FALSE;

            if (diskData->PartitionType == 0 && (diskData->PartitionNumber > 0)) {

                status = STATUS_INVALID_DEVICE_REQUEST;
                break;
            }

            outputBuffer =
                    (PPARTITION_INFORMATION_EX)Irp->AssociatedIrp.SystemBuffer;

            //
            // FIXME: hack of the year, assume that partition is MBR
            // Thing that can obviously be wrong...
            //

            outputBuffer->PartitionStyle = PARTITION_STYLE_MBR;
            outputBuffer->Mbr.PartitionType = diskData->PartitionType;
            outputBuffer->StartingOffset = deviceExtension->StartingOffset;
            outputBuffer->PartitionLength.QuadPart = deviceExtension->PartitionLength.QuadPart;
            outputBuffer->Mbr.HiddenSectors = diskData->HiddenSectors;
            outputBuffer->PartitionNumber = diskData->PartitionNumber;
            outputBuffer->Mbr.BootIndicator = diskData->BootIndicator;
            outputBuffer->RewritePartition = FALSE;
            outputBuffer->Mbr.RecognizedPartition =
                IsRecognizedPartition(diskData->PartitionType);

            status = STATUS_SUCCESS;
            Irp->IoStatus.Information = sizeof(PARTITION_INFORMATION_EX);
        }

        break;

    case IOCTL_DISK_SET_PARTITION_INFO:

        if (diskData->PartitionNumber == 0) {

            status = STATUS_UNSUCCESSFUL;

        } else {

            PSET_PARTITION_INFORMATION inputBuffer =
                (PSET_PARTITION_INFORMATION)Irp->AssociatedIrp.SystemBuffer;

            //
            // Validate buffer length.
            //

            if (irpStack->Parameters.DeviceIoControl.InputBufferLength <
                sizeof(SET_PARTITION_INFORMATION)) {

                status = STATUS_INFO_LENGTH_MISMATCH;
                break;
            }

            //
            // The HAL routines IoGet- and IoSetPartitionInformation were
            // developed before support of dynamic partitioning and therefore
            // don't distinguish between partition ordinal (that is the order
            // of a partition on a disk) and the partition number. (The
            // partition number is assigned to a partition to identify it to
            // the system.) Use partition ordinals for these legacy calls.
            //

            status = IoSetPartitionInformation(
                          deviceExtension->PhysicalDevice,
                          deviceExtension->DiskGeometry->Geometry.BytesPerSector,
                          diskData->PartitionOrdinal,
                          inputBuffer->PartitionType);

            if (NT_SUCCESS(status)) {

                diskData->PartitionType = inputBuffer->PartitionType;
            }
        }

        break;

    case IOCTL_DISK_GET_DRIVE_LAYOUT:

        //
        // Return the partition layout for the physical drive.  Note that
        // the layout is returned for the actual physical drive, regardless
        // of which partition was specified for the request.
        //

        if (irpStack->Parameters.DeviceIoControl.OutputBufferLength <
            sizeof(DRIVE_LAYOUT_INFORMATION)) {
            status = STATUS_INFO_LENGTH_MISMATCH;

        } else {

            PDRIVE_LAYOUT_INFORMATION partitionList;
            PDEVICE_EXTENSION         physicalExtension = deviceExtension;
            PPARTITION_INFORMATION    partitionEntry;
            PDISK_DATA                diskData;
            ULONG                     tempSize;
            ULONG                     i;

            //
            // Read partition information.
            //

            status = IoReadPartitionTable(deviceExtension->PhysicalDevice,
                              deviceExtension->DiskGeometry->Geometry.BytesPerSector,
                              FALSE,
                              &partitionList);

            if (!NT_SUCCESS(status)) {
                break;
            }

            //
            // The disk layout has been returned in the partitionList
            // buffer.  Determine its size and, if the data will fit
            // into the intermediary buffer, return it.
            //

            tempSize = FIELD_OFFSET(DRIVE_LAYOUT_INFORMATION,PartitionEntry[0]);
            tempSize += partitionList->PartitionCount *
                        sizeof(PARTITION_INFORMATION);

            if (tempSize >
               irpStack->Parameters.DeviceIoControl.OutputBufferLength) {

                status = STATUS_BUFFER_TOO_SMALL;
                ExFreePool(partitionList);
                break;
            }

            //
            // Walk partition list to associate partition numbers with
            // partition entries.
            //

            for (i = 0; i < partitionList->PartitionCount; i++) {

                //
                // Walk partition chain anchored at physical disk extension.
                //

                deviceExtension = physicalExtension;
                diskData = (PDISK_DATA)(deviceExtension + 1);

                do {

                    deviceExtension = diskData->NextPartition;

                    //
                    // Check if this is the last partition in the chain.
                    //

                    if (!deviceExtension) {
                       break;
                    }

                    //
                    // Get the partition device extension from disk data.
                    //

                    diskData = (PDISK_DATA)(deviceExtension + 1);

                    //
                    // Check if this partition is not currently being used.
                    //

                    if (!deviceExtension->PartitionLength.QuadPart) {
                       continue;
                    }

                    partitionEntry = &partitionList->PartitionEntry[i];

                    //
                    // Check if empty, or describes extended partition or hasn't changed.
                    //

                    if (partitionEntry->PartitionType == PARTITION_ENTRY_UNUSED ||
                        IsContainerPartition(partitionEntry->PartitionType)) {
                        continue;
                    }

                    //
                    // Check if new partition starts where this partition starts.
                    //

                    if (partitionEntry->StartingOffset.QuadPart !=
                              deviceExtension->StartingOffset.QuadPart) {
                        continue;
                    }

                    //
                    // Check if partition length is the same.
                    //

                    if (partitionEntry->PartitionLength.QuadPart ==
                              deviceExtension->PartitionLength.QuadPart) {

                        //
                        // Partitions match. Update partition number.
                        //

                        partitionEntry->PartitionNumber =
                            diskData->PartitionNumber;
                        break;
                    }

                } while (TRUE);
            }

            //
            // Copy partition information to system buffer.
            //

            RtlMoveMemory(Irp->AssociatedIrp.SystemBuffer,
                          partitionList,
                          tempSize);
            status = STATUS_SUCCESS;
            Irp->IoStatus.Information = tempSize;

            //
            // Finally, free the buffer allocated by reading the
            // partition table.
            //

            ExFreePool(partitionList);
        }

        break;

    case IOCTL_DISK_SET_DRIVE_LAYOUT:

        {

        //
        // Update the disk with new partition information.
        //

        PDRIVE_LAYOUT_INFORMATION partitionList = Irp->AssociatedIrp.SystemBuffer;

        //
        // Validate buffer length.
        //

        if (irpStack->Parameters.DeviceIoControl.InputBufferLength <
            sizeof(DRIVE_LAYOUT_INFORMATION)) {

            status = STATUS_INFO_LENGTH_MISMATCH;
            break;
        }

        length = sizeof(DRIVE_LAYOUT_INFORMATION) +
            (partitionList->PartitionCount - 1) * sizeof(PARTITION_INFORMATION);


        if (irpStack->Parameters.DeviceIoControl.InputBufferLength <
            length) {

            status = STATUS_BUFFER_TOO_SMALL;
            break;
        }

        //
        // Verify that device object is for physical disk.
        //

        if (deviceExtension->PhysicalDevice->DeviceExtension != deviceExtension) {
            status = STATUS_INVALID_PARAMETER;
            break;
        }

        //
        // Walk through partition table comparing partitions to
        // existing partitions to create, delete and change
        // device objects as necessary.
        //

        UpdateDeviceObjects(DeviceObject,
                            Irp);

        //
        // Write changes to disk.
        //

        status = IoWritePartitionTable(
                           deviceExtension->DeviceObject,
                           deviceExtension->DiskGeometry->Geometry.BytesPerSector,
                           deviceExtension->DiskGeometry->Geometry.SectorsPerTrack,
                           deviceExtension->DiskGeometry->Geometry.TracksPerCylinder,
                           partitionList);
        }

        //
        // Update IRP with bytes returned.
        //

        if (NT_SUCCESS(status)) {
            Irp->IoStatus.Information = length;
        }

        break;

    case IOCTL_DISK_REASSIGN_BLOCKS:

        //
        // Map defective blocks to new location on disk.
        //

        {

        PREASSIGN_BLOCKS badBlocks = Irp->AssociatedIrp.SystemBuffer;
        ULONG bufferSize;
        ULONG blockNumber;
        ULONG blockCount;

        //
        // Validate buffer length.
        //

        if (irpStack->Parameters.DeviceIoControl.InputBufferLength <
            sizeof(REASSIGN_BLOCKS)) {

            status = STATUS_INFO_LENGTH_MISMATCH;
            break;
        }

        bufferSize = sizeof(REASSIGN_BLOCKS) +
            (badBlocks->Count - 1) * sizeof(ULONG);

        if (irpStack->Parameters.DeviceIoControl.InputBufferLength <
            bufferSize) {

            status = STATUS_INFO_LENGTH_MISMATCH;
            break;
        }

        //
        // Build the data buffer to be transferred in the input buffer.
        // The format of the data to the device is:
        //
        //      2 bytes Reserved
        //      2 bytes Length
        //      x * 4 btyes Block Address
        //
        // All values are big endian.
        //

        badBlocks->Reserved = 0;
        blockCount = badBlocks->Count;

        //
        // Convert # of entries to # of bytes.
        //

        blockCount *= 4;
        badBlocks->Count = (USHORT) ((blockCount >> 8) & 0XFF);
        badBlocks->Count |= (USHORT) ((blockCount << 8) & 0XFF00);

        //
        // Convert back to number of entries.
        //

        blockCount /= 4;

        for (; blockCount > 0; blockCount--) {

            blockNumber = badBlocks->BlockNumber[blockCount-1];

            REVERSE_BYTES((PFOUR_BYTE) &badBlocks->BlockNumber[blockCount-1],
                          (PFOUR_BYTE) &blockNumber);
        }

        srb->CdbLength = 6;

        cdb->CDB6GENERIC.OperationCode = SCSIOP_REASSIGN_BLOCKS;

        //
        // Set timeout value.
        //

        srb->TimeOutValue = deviceExtension->TimeOutValue;

        status = ScsiClassSendSrbSynchronous(DeviceObject,
                                             srb,
                                             badBlocks,
                                             bufferSize,
                                             TRUE);

        Irp->IoStatus.Status = status;
        Irp->IoStatus.Information = 0;
        ExFreePool(srb);
        IoCompleteRequest(Irp, IO_DISK_INCREMENT);
        }

        return(status);

    case IOCTL_DISK_IS_WRITABLE:

        //
        // Determine if the device is writable.
        //

        modeData = ExAllocatePool(NonPagedPoolCacheAligned, MODE_DATA_SIZE);

        if (modeData == NULL) {
            status = STATUS_INSUFFICIENT_RESOURCES;
            break;
        }

        RtlZeroMemory(modeData, MODE_DATA_SIZE);

        length = ScsiClassModeSense(DeviceObject,
                                    (PCHAR) modeData,
                                    MODE_DATA_SIZE,
                                    MODE_SENSE_RETURN_ALL);

        if (length < sizeof(MODE_PARAMETER_HEADER)) {

            //
            // Retry the request in case of a check condition.
            //

            length = ScsiClassModeSense(DeviceObject,
                                        (PCHAR) modeData,
                                        MODE_DATA_SIZE,
                                        MODE_SENSE_RETURN_ALL);

            if (length < sizeof(MODE_PARAMETER_HEADER)) {
                status = STATUS_IO_DEVICE_ERROR;
                ExFreePool(modeData);
                break;
            }
        }

        if (modeData->DeviceSpecificParameter & MODE_DSP_WRITE_PROTECT) {
            status = STATUS_MEDIA_WRITE_PROTECTED;
        } else {
            status = STATUS_SUCCESS;
        }

        ExFreePool(modeData);
        break;

    case IOCTL_DISK_INTERNAL_SET_VERIFY:

        //
        // If the caller is kernel mode, set the verify bit.
        //

        if (Irp->RequestorMode == KernelMode) {
            DeviceObject->Flags |= DO_VERIFY_VOLUME;
        }
        status = STATUS_SUCCESS;
        break;

    case IOCTL_DISK_INTERNAL_CLEAR_VERIFY:

        //
        // If the caller is kernel mode, clear the verify bit.
        //

        if (Irp->RequestorMode == KernelMode) {
            DeviceObject->Flags &= ~DO_VERIFY_VOLUME;
        }
        status = STATUS_SUCCESS;
        break;

    case IOCTL_DISK_FIND_NEW_DEVICES:

        //
        // Search for devices that have been powered on since the last
        // device search or system initialization.
        //

        DebugPrint((3,"CdRomDeviceControl: Find devices\n"));
        status = DriverEntry(DeviceObject->DriverObject,
                             NULL);

        Irp->IoStatus.Status = status;
        ExFreePool(srb);
        IoCompleteRequest(Irp, IO_NO_INCREMENT);
        return status;

    case IOCTL_DISK_MEDIA_REMOVAL:

        //
        // If the disk is not removable then don't allow this command.
        //

        if (!(DeviceObject->Characteristics & FILE_REMOVABLE_MEDIA)) {
            status = STATUS_INVALID_DEVICE_REQUEST;
            break;
        }

        //
        // Fall through and let the class driver process the request.
        //

    case IOCTL_DISK_GET_LENGTH_INFO:

        //
        // Validate buffer length.
        //

        if (irpStack->Parameters.DeviceIoControl.OutputBufferLength <
            sizeof(GET_LENGTH_INFORMATION)) {
            status = STATUS_BUFFER_TOO_SMALL;

        } else {

            PGET_LENGTH_INFORMATION lengthInformation = Irp->AssociatedIrp.SystemBuffer;

            //
            // Update the geometry in case it has changed.
            //

            status = UpdateRemovableGeometry (DeviceObject, Irp);

            if (!NT_SUCCESS(status)) {

                //
                // Note the drive is not ready.
                //

                diskData->DriveNotReady = TRUE;
                break;
            }

            //
            // Note the drive is now ready.
            //

            diskData->DriveNotReady = FALSE;

            //
            // Output data, and return
            //

            lengthInformation->Length.QuadPart = deviceExtension->PartitionLength.QuadPart;
            status = STATUS_SUCCESS;
            Irp->IoStatus.Information = sizeof(GET_LENGTH_INFORMATION);
        }

        break;

    default:

        //
        // Free the Srb, since it is not needed.
        //

        ExFreePool(srb);

        //
        // Pass the request to the common device control routine.
        //

        return(ScsiClassDeviceControl(DeviceObject, Irp));

        break;

    } // end switch( ...

    Irp->IoStatus.Status = status;

    if (!NT_SUCCESS(status) && IoIsErrorUserInduced(status)) {

        IoSetHardErrorOrVerifyDevice(Irp, DeviceObject);
    }

    IoCompleteRequest(Irp, IO_NO_INCREMENT);
    ExFreePool(srb);
    return(status);

} // end ScsiDiskDeviceControl()

ScsiDiskDeviceVerification()

BOOLEAN NTAPI ScsiDiskDeviceVerification

(

IN PINQUIRYDATA

InquiryData

)

Definition at line 408 of file disk.c.

{

    if (((InquiryData->DeviceType == DIRECT_ACCESS_DEVICE) ||
        (InquiryData->DeviceType == OPTICAL_DEVICE)) &&
        InquiryData->DeviceTypeQualifier == 0) {

        return TRUE;

    } else {
        return FALSE;
    }
}

Referenced by DriverEntry().

ScsiDiskFileSystemControl()

NTSTATUS NTAPI ScsiDiskFileSystemControl	(	PDEVICE_OBJECT	DeviceObject,
		PIRP	Irp
	)

ScsiDiskModeSelect()

BOOLEAN NTAPI ScsiDiskModeSelect	(	IN PDEVICE_OBJECT	DeviceObject,
		IN PCHAR	ModeSelectBuffer,
		IN ULONG	Length,
		IN BOOLEAN	SavePage
	)

Definition at line 3416 of file disk.c.

{
    PDEVICE_EXTENSION deviceExtension = DeviceObject->DeviceExtension;
    PCDB cdb;
    SCSI_REQUEST_BLOCK srb;
    ULONG retries = 1;
    ULONG length2;
    NTSTATUS status;
    ULONG_PTR buffer;
    PMODE_PARAMETER_BLOCK blockDescriptor;

    PAGED_CODE();

    length2 = Length + sizeof(MODE_PARAMETER_HEADER) + sizeof(MODE_PARAMETER_BLOCK);

    //
    // Allocate buffer for mode select header, block descriptor, and mode page.
    //

    buffer = (ULONG_PTR)ExAllocatePool(NonPagedPoolCacheAligned,length2);

    RtlZeroMemory((PVOID)buffer, length2);

    //
    // Set length in header to size of mode page.
    //

    ((PMODE_PARAMETER_HEADER)buffer)->BlockDescriptorLength = sizeof(MODE_PARAMETER_BLOCK);

    blockDescriptor = (PMODE_PARAMETER_BLOCK)(buffer + 1);

    //
    // Set size
    //

    blockDescriptor->BlockLength[1]=0x02;

    //
    // Copy mode page to buffer.
    //

    RtlCopyMemory((PVOID)(buffer + 3), ModeSelectBuffer, Length);

    //
    // Zero SRB.
    //

    RtlZeroMemory(&srb, sizeof(SCSI_REQUEST_BLOCK));

    //
    // Build the MODE SELECT CDB.
    //

    srb.CdbLength = 6;
    cdb = (PCDB)srb.Cdb;

    //
    // Set timeout value from device extension.
    //

    srb.TimeOutValue = deviceExtension->TimeOutValue * 2;

    cdb->MODE_SELECT.OperationCode = SCSIOP_MODE_SELECT;
    cdb->MODE_SELECT.SPBit = SavePage;
    cdb->MODE_SELECT.PFBit = 1;
    cdb->MODE_SELECT.ParameterListLength = (UCHAR)(length2);

Retry:

    status = ScsiClassSendSrbSynchronous(DeviceObject,
                                         &srb,
                                         (PVOID)buffer,
                                         length2,
                                         TRUE);


    if (status == STATUS_VERIFY_REQUIRED) {

        //
        // Routine ScsiClassSendSrbSynchronous does not retry requests returned with
        // this status.
        //

        if (retries--) {

            //
            // Retry request.
            //

            goto Retry;
        }

    } else if (SRB_STATUS(srb.SrbStatus) == SRB_STATUS_DATA_OVERRUN) {
        status = STATUS_SUCCESS;
    }

    ExFreePool((PVOID)buffer);

    if (NT_SUCCESS(status)) {
        return(TRUE);
    } else {
        return(FALSE);
    }

} // end SciDiskModeSelect()

Referenced by DisableWriteCache().

ScsiDiskProcessError()

VOID NTAPI ScsiDiskProcessError	(	PDEVICE_OBJECT	DeviceObject,
		PSCSI_REQUEST_BLOCK	Srb,
		NTSTATUS *	Status,
		BOOLEAN *	Retry
	)

Definition at line 4706 of file disk.c.

{
    PDEVICE_EXTENSION deviceExtension = DeviceObject->DeviceExtension;

    if (*Status == STATUS_DATA_OVERRUN &&
        ( Srb->Cdb[0] == SCSIOP_WRITE || Srb->Cdb[0] == SCSIOP_READ)) {

            *Retry = TRUE;

            //
            // Update the error count for the device.
            //

            deviceExtension->ErrorCount++;
    }

    if (SRB_STATUS(Srb->SrbStatus) == SRB_STATUS_ERROR &&
        Srb->ScsiStatus == SCSISTAT_BUSY) {

        //
        // The disk drive should never be busy this long. Reset the scsi bus
        // maybe this will clear the condition.
        //

        ResetScsiBus(DeviceObject);

        //
        // Update the error count for the device.
        //

        deviceExtension->ErrorCount++;
    }
}

Referenced by DriverEntry().

ScsiDiskReadWriteVerification()

NTSTATUS NTAPI ScsiDiskReadWriteVerification	(	IN PDEVICE_OBJECT	DeviceObject,
		IN PIRP	Irp
	)

Definition at line 1638 of file disk.c.

{
    PDEVICE_EXTENSION deviceExtension = DeviceObject->DeviceExtension;
    PIO_STACK_LOCATION currentIrpStack = IoGetCurrentIrpStackLocation(Irp);
    ULONG transferByteCount = currentIrpStack->Parameters.Read.Length;
    LARGE_INTEGER startingOffset;

    //
    // HACK: How can we end here with null sector size?!
    //

    if (deviceExtension->DiskGeometry->Geometry.BytesPerSector == 0) {
        DPRINT1("Hack! Received invalid sector size\n");
        deviceExtension->DiskGeometry->Geometry.BytesPerSector = 512;
    }

    //
    // Verify parameters of this request.
    // Check that ending sector is within partition and
    // that number of bytes to transfer is a multiple of
    // the sector size.
    //

    startingOffset.QuadPart = (currentIrpStack->Parameters.Read.ByteOffset.QuadPart +
                               transferByteCount);

    if ((startingOffset.QuadPart > deviceExtension->PartitionLength.QuadPart) ||
        (transferByteCount & (deviceExtension->DiskGeometry->Geometry.BytesPerSector - 1))) {

        //
        // This error maybe caused by the fact that the drive is not ready.
        //

        if (((PDISK_DATA)(deviceExtension + 1))->DriveNotReady) {

            //
            // Flag this as a user error so that a popup is generated.
            //

            Irp->IoStatus.Status = STATUS_DEVICE_NOT_READY;
            IoSetHardErrorOrVerifyDevice(Irp, DeviceObject);

        } else {

            //
            // Note fastfat depends on this parameter to determine when to
            // remount do to a sector size change.
            //

            Irp->IoStatus.Status = STATUS_INVALID_PARAMETER;
        }

        if (startingOffset.QuadPart > deviceExtension->PartitionLength.QuadPart) {
            DPRINT1("Reading beyond partition end! startingOffset: %I64d, PartitionLength: %I64d\n", startingOffset.QuadPart, deviceExtension->PartitionLength.QuadPart);
        }

        if (transferByteCount & (deviceExtension->DiskGeometry->Geometry.BytesPerSector - 1)) {
            DPRINT1("Not reading sectors! TransferByteCount: %lu, BytesPerSector: %lu\n", transferByteCount, deviceExtension->DiskGeometry->Geometry.BytesPerSector);
        }

        if (Irp->IoStatus.Status == STATUS_DEVICE_NOT_READY) {
            DPRINT1("Failing due to device not ready!\n");
        }

        return STATUS_INVALID_PARAMETER;
    }

    return STATUS_SUCCESS;

} // end ScsiDiskReadWrite()

Referenced by DriverEntry().

ScsiDiskShutdownFlush()

NTSTATUS NTAPI ScsiDiskShutdownFlush	(	IN PDEVICE_OBJECT	DeviceObject,
		IN PIRP	Irp
	)

Definition at line 3098 of file disk.c.

{
    PDEVICE_EXTENSION deviceExtension = DeviceObject->DeviceExtension;
    PIO_STACK_LOCATION irpStack;
    PSCSI_REQUEST_BLOCK srb;
    NTSTATUS status;
    PCDB cdb;

    //
    // Allocate SCSI request block.
    //

    srb = ExAllocatePool(NonPagedPool, sizeof(SCSI_REQUEST_BLOCK));

    if (srb == NULL) {

        //
        // Set the status and complete the request.
        //

        Irp->IoStatus.Status = STATUS_INSUFFICIENT_RESOURCES;
        IoCompleteRequest(Irp, IO_NO_INCREMENT);
        return(STATUS_INSUFFICIENT_RESOURCES);
    }

    RtlZeroMemory(srb, SCSI_REQUEST_BLOCK_SIZE);

    //
    // Write length to SRB.
    //

    srb->Length = SCSI_REQUEST_BLOCK_SIZE;

    //
    // Set SCSI bus address.
    //

    srb->PathId = deviceExtension->PathId;
    srb->TargetId = deviceExtension->TargetId;
    srb->Lun = deviceExtension->Lun;

    //
    // Set timeout value and mark the request as not being a tagged request.
    //

    srb->TimeOutValue = deviceExtension->TimeOutValue * 4;
    srb->QueueTag = SP_UNTAGGED;
    srb->QueueAction = SRB_SIMPLE_TAG_REQUEST;
    srb->SrbFlags = deviceExtension->SrbFlags;

    //
    // If the write cache is enabled then send a synchronize cache request.
    //

    if (deviceExtension->DeviceFlags & DEV_WRITE_CACHE) {

        srb->Function = SRB_FUNCTION_EXECUTE_SCSI;
        srb->CdbLength = 10;

        srb->Cdb[0] = SCSIOP_SYNCHRONIZE_CACHE;

        status = ScsiClassSendSrbSynchronous(DeviceObject,
                                             srb,
                                             NULL,
                                             0,
                                             TRUE);

        DebugPrint((1, "ScsiDiskShutdownFlush: Synchronize cache sent. Status = %lx\n", status ));
    }

    //
    // Unlock the device if it is removable and this is a shutdown.
    //

    irpStack = IoGetCurrentIrpStackLocation(Irp);

    if (DeviceObject->Characteristics & FILE_REMOVABLE_MEDIA &&
        irpStack->MajorFunction == IRP_MJ_SHUTDOWN) {

        srb->CdbLength = 6;
        cdb = (PVOID) srb->Cdb;
        cdb->MEDIA_REMOVAL.OperationCode = SCSIOP_MEDIUM_REMOVAL;
        cdb->MEDIA_REMOVAL.Prevent = FALSE;

        //
        // Set timeout value.
        //

        srb->TimeOutValue = deviceExtension->TimeOutValue;
        status = ScsiClassSendSrbSynchronous(DeviceObject,
                                             srb,
                                             NULL,
                                             0,
                                             TRUE);

        DebugPrint((1, "ScsiDiskShutdownFlush: Unlock device request sent. Status = %lx\n", status ));
    }

    srb->CdbLength = 0;

    //
    // Save a few parameters in the current stack location.
    //

    srb->Function = irpStack->MajorFunction == IRP_MJ_SHUTDOWN ?
        SRB_FUNCTION_SHUTDOWN : SRB_FUNCTION_FLUSH;

    //
    // Set the retry count to zero.
    //

    irpStack->Parameters.Others.Argument4 = (PVOID) 0;

    //
    // Set up IoCompletion routine address.
    //