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reactos/ntoskrnl/fstub/disksup.c
Pierre Schweitzer 324285f0b9
[NTOSKRNL] Properly check for Ft volumes 
This fixes a regression introduced in 5ab1cfc which
was causing Unix (BtrFS, ExtX, and so on) volumes not
to be assigned a drive letter assigned anymore. And
thus, they were no longer mounted and presented to the
users.

CORE-16499
2019-11-11 21:20:58 +01:00

2803 lines
94 KiB
C
Raw Blame History

/*
* PROJECT: ReactOS Kernel
* LICENSE: GPL - See COPYING in the top level directory
* FILE: ntoskrnl/fstub/disksup.c
* PURPOSE: I/O HAL Routines for Disk Access
* PROGRAMMERS: Alex Ionescu (alex.ionescu@reactos.org)
* Eric Kohl
* Casper S. Hornstrup (chorns@users.sourceforge.net)
* Pierre Schweitzer
*/
/* INCLUDES ******************************************************************/
#include <ntoskrnl.h>
#define NDEBUG
#include <debug.h>
#include <internal/hal.h>
const WCHAR DiskMountString[] = L"\\DosDevices\\%C:";
#define AUTO_DRIVE MAXULONG
#define PARTITION_MAGIC 0xaa55
#define EFI_PMBR_OSTYPE_EFI 0xEE
#include <pshpack1.h>
typedef struct _REG_DISK_MOUNT_INFO
{
ULONG Signature;
LARGE_INTEGER StartingOffset;
} REG_DISK_MOUNT_INFO, *PREG_DISK_MOUNT_INFO;
#include <poppack.h>
typedef enum _DISK_MANAGER
{
NoDiskManager,
OntrackDiskManager,
EZ_Drive
} DISK_MANAGER;
typedef enum _PARTITION_TYPE
{
BootablePartition,
PrimaryPartition,
LogicalPartition,
FtPartition,
UnknownPartition,
DataPartition
} PARTITION_TYPE, *PPARTITION_TYPE;
NTSTATUS
FASTCALL
HalpQueryDriveLayout(IN PUNICODE_STRING DeviceName,
OUT PDRIVE_LAYOUT_INFORMATION *LayoutInfo)
{
IO_STATUS_BLOCK StatusBlock;
PDEVICE_OBJECT DeviceObject = NULL;
PFILE_OBJECT FileObject;
KEVENT Event;
PIRP Irp;
NTSTATUS Status;
ULONG BufferSize;
PDRIVE_LAYOUT_INFORMATION Buffer;
PAGED_CODE();
/* Get device pointers */
Status = IoGetDeviceObjectPointer(DeviceName,
FILE_READ_ATTRIBUTES,
&FileObject,
&DeviceObject);
if (!NT_SUCCESS(Status))
{
return Status;
}
/* Get attached device object */
DeviceObject = IoGetAttachedDeviceReference(FileObject->DeviceObject);
ObDereferenceObject(FileObject);
/* Do not handle removable media */
if (BooleanFlagOn(DeviceObject->Characteristics, FILE_REMOVABLE_MEDIA))
{
ObDereferenceObject(DeviceObject);
return STATUS_NO_MEDIA;
}
/* We'll loop until our buffer is big enough */
Buffer = NULL;
BufferSize = 0x1000;
KeInitializeEvent(&Event, NotificationEvent, FALSE);
do
{
/* If we already had a buffer, it means it's not big
* enough, so free and multiply size by two
*/
if (Buffer != NULL)
{
ExFreePoolWithTag(Buffer, TAG_FSTUB);
BufferSize *= 2;
}
/* Allocate buffer for output buffer */
Buffer = ExAllocatePoolWithTag(NonPagedPool, BufferSize, TAG_FSTUB);
if (Buffer == NULL)
{
Status = STATUS_NO_MEMORY;
break;
}
/* Build the IRP to query drive layout */
Irp = IoBuildDeviceIoControlRequest(IOCTL_DISK_GET_DRIVE_LAYOUT,
DeviceObject,
NULL,
0,
Buffer,
BufferSize,
FALSE,
&Event,
&StatusBlock);
if (Irp == NULL)
{
Status = STATUS_INSUFFICIENT_RESOURCES;
break;
}
/* Call the driver and wait if appropriate */
Status = IoCallDriver(DeviceObject, Irp);
if (Status == STATUS_PENDING)
{
KeWaitForSingleObject(&Event,
Executive,
KernelMode,
FALSE,
NULL);
Status = StatusBlock.Status;
}
/* If buffer is too small, keep looping */
} while (Status == STATUS_BUFFER_TOO_SMALL);
/* We're done with the device */
ObDereferenceObject(DeviceObject);
/* If querying worked, then return the buffer to the caller */
if (NT_SUCCESS(Status))
{
ASSERT(Buffer != NULL);
*LayoutInfo = Buffer;
}
/* Else, release the buffer if still allocated and fail */
else
{
if (Buffer != NULL)
{
ExFreePoolWithTag(Buffer, TAG_FSTUB);
}
}
return Status;
}
NTSTATUS
HalpQueryPartitionType(IN PUNICODE_STRING DeviceName,
IN PDRIVE_LAYOUT_INFORMATION LayoutInfo,
OUT PPARTITION_TYPE PartitionType)
{
USHORT i;
PIRP Irp;
KEVENT Event;
NTSTATUS Status;
PFILE_OBJECT FileObject;
PDEVICE_OBJECT DeviceObject;
IO_STATUS_BLOCK IoStatusBlock;
PARTITION_INFORMATION_EX PartitionInfo;
PAGED_CODE();
/* Get device pointers */
Status = IoGetDeviceObjectPointer(DeviceName,
FILE_READ_ATTRIBUTES,
&FileObject,
&DeviceObject);
if (!NT_SUCCESS(Status))
{
return Status;
}
/* Get attached device object */
DeviceObject = IoGetAttachedDeviceReference(FileObject->DeviceObject);
ObDereferenceObject(FileObject);
/* Assume logical partition for removable devices */
if (BooleanFlagOn(DeviceObject->Characteristics, FILE_REMOVABLE_MEDIA))
{
ObDereferenceObject(DeviceObject);
*PartitionType = LogicalPartition;
return STATUS_SUCCESS;
}
/* For the others, query partition info */
KeInitializeEvent(&Event, NotificationEvent, FALSE);
Irp = IoBuildDeviceIoControlRequest(IOCTL_DISK_GET_PARTITION_INFO_EX,
DeviceObject,
NULL,
0,
&PartitionInfo,
sizeof(PartitionInfo),
FALSE,
&Event,
&IoStatusBlock);
if (Irp == NULL)
{
ObDereferenceObject(DeviceObject);
return STATUS_INSUFFICIENT_RESOURCES;
}
Status = IoCallDriver(DeviceObject, Irp);
if (Status == STATUS_PENDING)
{
KeWaitForSingleObject(&Event,
Executive,
KernelMode,
FALSE,
NULL);
Status = IoStatusBlock.Status;
}
/* We're done with the device */
ObDereferenceObject(DeviceObject);
/* If we failed querying partition info, try to return something
* if caller didn't provide a precise layout, assume logical
* partition and fake success. Otherwise, just fail.
*/
if (!NT_SUCCESS(Status))
{
if (LayoutInfo == NULL)
{
*PartitionType = LogicalPartition;
return STATUS_SUCCESS;
}
return Status;
}
/* First, handle non MBR style (easy cases) */
if (PartitionInfo.PartitionStyle != PARTITION_STYLE_MBR)
{
/* If not GPT, we don't know what it is */
if (PartitionInfo.PartitionStyle != PARTITION_STYLE_GPT)
{
*PartitionType = UnknownPartition;
return STATUS_SUCCESS;
}
/* Check whether that's data partition */
if (RtlCompareMemory(&PartitionInfo.Gpt.PartitionType,
&PARTITION_BASIC_DATA_GUID,
sizeof(GUID)) == sizeof(GUID))
{
*PartitionType = DataPartition;
return STATUS_SUCCESS;
}
/* Otherwise, we don't know */
*PartitionType = UnknownPartition;
return STATUS_SUCCESS;
}
/* If we don't recognize partition type, return unknown */
if (!IsRecognizedPartition(PartitionInfo.Mbr.PartitionType))
{
*PartitionType = UnknownPartition;
return STATUS_SUCCESS;
}
/* Check if that's a FT volume */
if (IsFTPartition(PartitionInfo.Mbr.PartitionType))
{
*PartitionType = FtPartition;
return STATUS_SUCCESS;
}
/* If the caller didn't provide the complete layout, just return */
if (LayoutInfo == NULL)
{
*PartitionType = LogicalPartition;
return STATUS_SUCCESS;
}
/* Now, evaluate the partition to the 4 in the input layout */
for (i = 0; i < 4; ++i)
{
/* If we find a partition matching */
if (LayoutInfo->PartitionEntry[i].StartingOffset.QuadPart == PartitionInfo.StartingOffset.QuadPart)
{
/* Return boot if boot flag is set */
if (PartitionInfo.Mbr.BootIndicator)
{
*PartitionType = BootablePartition;
}
/* Primary otherwise */
else
{
*PartitionType = PrimaryPartition;
}
return STATUS_SUCCESS;
}
}
/* Otherwise, assume logical */
*PartitionType = LogicalPartition;
return STATUS_SUCCESS;
}
PULONG
IopComputeHarddiskDerangements(IN ULONG DiskCount)
{
PIRP Irp;
KEVENT Event;
ULONG i, j, k;
PULONG Devices;
NTSTATUS Status;
WCHAR Buffer[100];
UNICODE_STRING ArcName;
PFILE_OBJECT FileObject;
PDEVICE_OBJECT DeviceObject;
IO_STATUS_BLOCK IoStatusBlock;
STORAGE_DEVICE_NUMBER DeviceNumber;
/* No disks, nothing to do */
if (DiskCount == 0)
{
return NULL;
}
/* Allocate a buffer big enough to hold all the disks */
Devices = ExAllocatePoolWithTag(PagedPool | POOL_COLD_ALLOCATION,
sizeof(ULONG) * DiskCount,
TAG_FSTUB);
if (Devices == NULL)
{
return NULL;
}
/* Now, we'll query all the disks */
for (i = 0; i < DiskCount; ++i)
{
/* Using their ARC name */
swprintf(Buffer, L"\\ArcName\\multi(0)disk(0)rdisk(%d)", i);
RtlInitUnicodeString(&ArcName, Buffer);
/* Get the attached DeviceObject */
if (NT_SUCCESS(IoGetDeviceObjectPointer(&ArcName, FILE_READ_ATTRIBUTES, &FileObject, &DeviceObject)))
{
DeviceObject = IoGetAttachedDeviceReference(FileObject->DeviceObject);
ObDereferenceObject(FileObject);
/* And query it for device number */
KeInitializeEvent(&Event, NotificationEvent, FALSE);
Irp = IoBuildDeviceIoControlRequest(IOCTL_STORAGE_GET_DEVICE_NUMBER,
DeviceObject,
NULL,
0,
&DeviceNumber,
sizeof(DeviceNumber),
FALSE,
&Event,
&IoStatusBlock);
if (Irp != NULL)
{
Status = IoCallDriver(DeviceObject, Irp);
if (Status == STATUS_PENDING)
{
KeWaitForSingleObject(&Event,
Executive,
KernelMode,
FALSE,
NULL);
Status = IoStatusBlock.Status;
}
ObDereferenceObject(DeviceObject);
/* In case of a success remember device number */
if (NT_SUCCESS(Status))
{
Devices[i] = DeviceNumber.DeviceNumber;
/* Move on, not to fall into our default case */
continue;
}
}
else
{
ObDereferenceObject(DeviceObject);
}
/* Default case, for failures, set -1 */
Devices[i] = -1;
}
}
/* Now, we'll check all device numbers */
for (i = 0; i < DiskCount; ++i)
{
/* First of all, check if we're at the right place */
for (j = 0; j < DiskCount; ++j)
{
if (Devices[j] == i)
{
break;
}
}
/* If not, perform the change */
if (j >= DiskCount)
{
k = 0;
while (Devices[k] != -1)
{
if (++k >= DiskCount)
{
break;
}
}
if (k < DiskCount)
{
Devices[k] = i;
}
}
}
/* Return our device derangement map */
return Devices;
}
NTSTATUS
HalpNextMountLetter(IN PUNICODE_STRING DeviceName,
OUT PUCHAR DriveLetter)
{
PIRP Irp;
KEVENT Event;
NTSTATUS Status;
UNICODE_STRING MountMgr;
PFILE_OBJECT FileObject;
PDEVICE_OBJECT DeviceObject;
IO_STATUS_BLOCK IoStatusBlock;
PMOUNTMGR_DRIVE_LETTER_TARGET Target;
MOUNTMGR_DRIVE_LETTER_INFORMATION LetterInfo;
/* To get next mount letter, we need the MountMgr */
RtlInitUnicodeString(&MountMgr, L"\\Device\\MountPointManager");
Status = IoGetDeviceObjectPointer(&MountMgr,
FILE_READ_ATTRIBUTES,
&FileObject,
&DeviceObject);
if (!NT_SUCCESS(Status))
{
return Status;
}
/* Allocate our input buffer */
Target = ExAllocatePoolWithTag(PagedPool,
DeviceName->Length + FIELD_OFFSET(MOUNTMGR_DRIVE_LETTER_TARGET, DeviceName),
TAG_FSTUB);
if (Target == NULL)
{
ObDereferenceObject(FileObject);
return STATUS_INSUFFICIENT_RESOURCES;
}
/* And fill it with the device hat needs a drive letter */
Target->DeviceNameLength = DeviceName->Length;
RtlCopyMemory(&Target->DeviceName[0], DeviceName->Buffer, DeviceName->Length);
/* Call the mount manager */
KeInitializeEvent(&Event, NotificationEvent, FALSE);
Irp = IoBuildDeviceIoControlRequest(IOCTL_MOUNTMGR_NEXT_DRIVE_LETTER,
DeviceObject,
Target,
DeviceName->Length + FIELD_OFFSET(MOUNTMGR_DRIVE_LETTER_TARGET, DeviceName),
&LetterInfo,
sizeof(LetterInfo),
FALSE,
&Event,
&IoStatusBlock);
if (Irp == NULL)
{
ExFreePoolWithTag(Target, TAG_FSTUB);
ObDereferenceObject(FileObject);
return STATUS_INSUFFICIENT_RESOURCES;
}
Status = IoCallDriver(DeviceObject, Irp);
if (Status == STATUS_PENDING)
{
KeWaitForSingleObject(&Event,
Executive,
KernelMode,
FALSE,
NULL);
Status = IoStatusBlock.Status;
}
ExFreePoolWithTag(Target, TAG_FSTUB);
ObDereferenceObject(FileObject);
DPRINT("Done: %d %c\n", LetterInfo.DriveLetterWasAssigned,
LetterInfo.CurrentDriveLetter);
/* Return the drive letter the MountMgr potentially assigned */
*DriveLetter = LetterInfo.CurrentDriveLetter;
/* Also return the success */
return Status;
}
NTSTATUS
HalpSetMountLetter(IN PUNICODE_STRING DeviceName,
UCHAR DriveLetter)
{
PIRP Irp;
KEVENT Event;
NTSTATUS Status;
WCHAR Buffer[30];
ULONG InputBufferLength;
PFILE_OBJECT FileObject;
PDEVICE_OBJECT DeviceObject;
IO_STATUS_BLOCK IoStatusBlock;
UNICODE_STRING DosDevice, MountMgr;
PMOUNTMGR_CREATE_POINT_INPUT InputBuffer;
/* Setup the DosDevice name */
swprintf(Buffer, L"\\DosDevices\\%c:", DriveLetter);
RtlInitUnicodeString(&DosDevice, Buffer);
/* Allocate the input buffer for the MountMgr */
InputBufferLength = DosDevice.Length + DeviceName->Length + sizeof(MOUNTMGR_CREATE_POINT_INPUT);
InputBuffer = ExAllocatePoolWithTag(PagedPool, InputBufferLength, TAG_FSTUB);
if (InputBuffer == NULL)
{
return STATUS_INSUFFICIENT_RESOURCES;
}
/* Fill the input buffer */
InputBuffer->SymbolicLinkNameOffset = sizeof(MOUNTMGR_CREATE_POINT_INPUT);
InputBuffer->SymbolicLinkNameLength = DosDevice.Length;
InputBuffer->DeviceNameOffset = DosDevice.Length + sizeof(MOUNTMGR_CREATE_POINT_INPUT);
InputBuffer->DeviceNameLength = DeviceName->Length;
RtlCopyMemory(&InputBuffer[1], DosDevice.Buffer, DosDevice.Length);
RtlCopyMemory((PVOID)((ULONG_PTR)InputBuffer + InputBuffer->DeviceNameOffset),
DeviceName->Buffer,
DeviceName->Length);
/* Get the MountMgr device pointer, to send the IOCTL */
RtlInitUnicodeString(&MountMgr, L"\\Device\\MountPointManager");
Status = IoGetDeviceObjectPointer(&MountMgr,
FILE_READ_ATTRIBUTES,
&FileObject,
&DeviceObject);
if (!NT_SUCCESS(Status))
{
ExFreePoolWithTag(InputBuffer, TAG_FSTUB);
return Status;
}
/* Call the MountMgr */
KeInitializeEvent(&Event, NotificationEvent, FALSE);
Irp = IoBuildDeviceIoControlRequest(IOCTL_MOUNTMGR_CREATE_POINT,
DeviceObject,
InputBuffer,
InputBufferLength,
NULL,
0,
FALSE,
&Event,
&IoStatusBlock);
if (Irp == NULL)
{
ObDereferenceObject(FileObject);
ExFreePoolWithTag(InputBuffer, TAG_FSTUB);
return STATUS_INSUFFICIENT_RESOURCES;
}
Status = IoCallDriver(DeviceObject, Irp);
if (Status == STATUS_PENDING)
{
KeWaitForSingleObject(&Event,
Executive,
KernelMode,
FALSE,
NULL);
Status = IoStatusBlock.Status;
}
ObDereferenceObject(FileObject);
ExFreePoolWithTag(InputBuffer, TAG_FSTUB);
/* Return the MountMgr status */
return Status;
}
UCHAR
HalpNextDriveLetter(IN PUNICODE_STRING DeviceName,
IN PSTRING NtDeviceName,
OUT PUCHAR NtSystemPath,
BOOLEAN IsRemovable)
{
UCHAR i;
WCHAR Buffer[40];
UCHAR DriveLetter;
UNICODE_STRING FloppyString, CdString, NtDeviceNameU, DosDevice;
/* Quick path, ask directly the mount manager to assign the next
* free drive letter
*/
if (NT_SUCCESS(HalpNextMountLetter(DeviceName, &DriveLetter)))
{
return DriveLetter;
}
/* We'll allow MountMgr to fail only for non vital path */
if (NtDeviceName == NULL || NtSystemPath == NULL)
{
return -1;
}
/* And for removable devices */
if (!IsRemovable)
{
return 0;
}
/* Removable might be floppy or cdrom */
RtlInitUnicodeString(&FloppyString, L"\\Device\\Floppy");
RtlInitUnicodeString(&CdString, L"\\Device\\CdRom");
/* If floppy, start at A */
if (RtlPrefixUnicodeString(&FloppyString, DeviceName, TRUE))
{
DriveLetter = 'A';
}
/* If CD start C */
else if (RtlPrefixUnicodeString(&CdString, DeviceName, TRUE))
{
DriveLetter = 'D';
}
/* For the rest start at C */
else
{
DriveLetter = 'C';
}
/* Now, try to assign a drive letter manually with the MountMgr */
for (i = DriveLetter; i <= 'Z'; ++i)
{
if (NT_SUCCESS(HalpSetMountLetter(DeviceName, i)))
{
/* If it worked, if we were managing system path, update manually */
if (NT_SUCCESS(RtlAnsiStringToUnicodeString(&NtDeviceNameU, NtDeviceName, TRUE)))
{
if (RtlEqualUnicodeString(&NtDeviceNameU, DeviceName, TRUE))
{
*NtSystemPath = i;
}
RtlFreeUnicodeString(&NtDeviceNameU);
}
return i;
}
}
/* Last fall back, we're not on a PnP device... */
for (i = DriveLetter; i <= 'Z'; ++i)
{
/* We'll link manually, without MountMgr knowing anything about the device */
swprintf(Buffer, L"\\DosDevices\\%c:", i);
RtlInitUnicodeString(&DosDevice, Buffer);
/* If linking worked, then the letter was free ;-) */
if (NT_SUCCESS(IoCreateSymbolicLink(&DosDevice, DeviceName)))
{
/* If it worked, if we were managing system path, update manually */
if (NT_SUCCESS(RtlAnsiStringToUnicodeString(&NtDeviceNameU, NtDeviceName, TRUE)))
{
if (RtlEqualUnicodeString(&NtDeviceNameU, DeviceName, TRUE))
{
*NtSystemPath = i;
}
RtlFreeUnicodeString(&NtDeviceNameU);
}
return i;
}
}
/* We're done, nothing happened */
return 0;
}
BOOLEAN
HalpIsOldStyleFloppy(PUNICODE_STRING DeviceName)
{
PIRP Irp;
KEVENT Event;
NTSTATUS Status;
MOUNTDEV_NAME DevName;
PFILE_OBJECT FileObject;
PDEVICE_OBJECT DeviceObject;
IO_STATUS_BLOCK IoStatusBlock;
PAGED_CODE();
/* Get the attached device object to our device */
if (!NT_SUCCESS(IoGetDeviceObjectPointer(DeviceName,
FILE_READ_ATTRIBUTES,
&FileObject,
&DeviceObject)))
{
return FALSE;
}
DeviceObject = IoGetAttachedDeviceReference(FileObject->DeviceObject);
ObDereferenceObject(FileObject);
/* Query its device name (ie, check floppy.sys implements MountMgr interface) */
KeInitializeEvent(&Event, NotificationEvent, FALSE);
Irp = IoBuildDeviceIoControlRequest(IOCTL_MOUNTDEV_QUERY_DEVICE_NAME,
DeviceObject,
NULL,
0,
&DevName,
sizeof(DevName),
FALSE,
&Event,
&IoStatusBlock);
if (Irp == NULL)
{
ObDereferenceObject(DeviceObject);
return FALSE;
}
Status = IoCallDriver(DeviceObject, Irp);
if (Status == STATUS_PENDING)
{
KeWaitForSingleObject(&Event,
Executive,
KernelMode,
FALSE,
NULL);
Status = IoStatusBlock.Status;
}
/* If status is not STATUS_BUFFER_OVERFLOW, it means
* it's pre-mountmgr driver, aka "Old style".
*/
ObDereferenceObject(DeviceObject);
return (Status != STATUS_BUFFER_OVERFLOW);
}
NTSTATUS
HalpDeleteMountLetter(UCHAR DriveLetter)
{
PIRP Irp;
KEVENT Event;
NTSTATUS Status;
WCHAR Buffer[30];
ULONG InputBufferLength;
PFILE_OBJECT FileObject;
PDEVICE_OBJECT DeviceObject;
IO_STATUS_BLOCK IoStatusBlock;
PMOUNTMGR_MOUNT_POINT InputBuffer;
UNICODE_STRING DosDevice, MountMgr;
PMOUNTMGR_MOUNT_POINTS OutputBuffer;
/* Setup the device name of the letter to delete */
swprintf(Buffer, L"\\DosDevices\\%c:", DriveLetter);
RtlInitUnicodeString(&DosDevice, Buffer);
/* Allocate the input buffer for MountMgr */
InputBufferLength = DosDevice.Length + sizeof(MOUNTMGR_MOUNT_POINT);
InputBuffer = ExAllocatePoolWithTag(PagedPool, InputBufferLength, TAG_FSTUB);
if (InputBuffer == NULL)
{
return STATUS_INSUFFICIENT_RESOURCES;
}
/* Fill it in */
RtlZeroMemory(InputBuffer, InputBufferLength);
InputBuffer->SymbolicLinkNameOffset = sizeof(MOUNTMGR_MOUNT_POINT);
InputBuffer->SymbolicLinkNameLength = DosDevice.Length;
RtlCopyMemory(&InputBuffer[1], DosDevice.Buffer, DosDevice.Length);
/* Allocate big enough output buffer (we don't care about the output) */
OutputBuffer = ExAllocatePoolWithTag(PagedPool, 0x1000, TAG_FSTUB);
if (OutputBuffer == NULL)
{
ExFreePoolWithTag(InputBuffer, TAG_FSTUB);
return STATUS_INSUFFICIENT_RESOURCES;
}
/* Get the device pointer to the MountMgr */
RtlInitUnicodeString(&MountMgr, L"\\Device\\MountPointManager");
Status = IoGetDeviceObjectPointer(&MountMgr,
FILE_READ_ATTRIBUTES,
&FileObject,
&DeviceObject);
if (!NT_SUCCESS(Status))
{
ExFreePoolWithTag(OutputBuffer, TAG_FSTUB);
ExFreePoolWithTag(InputBuffer, TAG_FSTUB);
return Status;
}
/* Call the mount manager to delete the drive letter */
KeInitializeEvent(&Event, NotificationEvent, FALSE);
Irp = IoBuildDeviceIoControlRequest(IOCTL_MOUNTMGR_DELETE_POINTS,
DeviceObject,
InputBuffer,
InputBufferLength,
OutputBuffer,
0x1000,
FALSE,
&Event,
&IoStatusBlock);
if (Irp == NULL)
{
ObDereferenceObject(FileObject);
ExFreePoolWithTag(OutputBuffer, TAG_FSTUB);
ExFreePoolWithTag(InputBuffer, TAG_FSTUB);
return STATUS_INSUFFICIENT_RESOURCES;
}
Status = IoCallDriver(DeviceObject, Irp);
if (Status == STATUS_PENDING)
{
KeWaitForSingleObject(&Event,
Executive,
KernelMode,
FALSE,
NULL);
Status = IoStatusBlock.Status;
}
ObDereferenceObject(FileObject);
ExFreePoolWithTag(OutputBuffer, TAG_FSTUB);
ExFreePoolWithTag(InputBuffer, TAG_FSTUB);
return Status;
}
VOID
HalpEnableAutomaticDriveLetterAssignment(VOID)
{
PIRP Irp;
KEVENT Event;
NTSTATUS Status;
UNICODE_STRING MountMgr;
PFILE_OBJECT FileObject;
PDEVICE_OBJECT DeviceObject;
IO_STATUS_BLOCK IoStatusBlock;
/* Get the device pointer to the MountMgr */
RtlInitUnicodeString(&MountMgr, L"\\Device\\MountPointManager");
Status = IoGetDeviceObjectPointer(&MountMgr,
FILE_READ_ATTRIBUTES,
&FileObject,
&DeviceObject);
if (!NT_SUCCESS(Status))
{
return;
}
/* Just send an IOCTL to enable the feature */
KeInitializeEvent(&Event, NotificationEvent, FALSE);
Irp = IoBuildDeviceIoControlRequest(IOCTL_MOUNTMGR_AUTO_DL_ASSIGNMENTS,
DeviceObject,
NULL,
0,
NULL,
0,
FALSE,
&Event,
&IoStatusBlock);
if (Irp == NULL)
{
return;
}
Status = IoCallDriver(DeviceObject, Irp);
if (Status == STATUS_PENDING)
{
KeWaitForSingleObject(&Event,
Executive,
KernelMode,
FALSE,
NULL);
Status = IoStatusBlock.Status;
}
ObDereferenceObject(FileObject);
return;
}
VOID
FASTCALL
xHalIoAssignDriveLetters(IN PLOADER_PARAMETER_BLOCK LoaderBlock,
IN PSTRING NtDeviceName,
OUT PUCHAR NtSystemPath,
OUT PSTRING NtSystemPathString)
{
USHORT i;
PULONG Devices;
NTSTATUS Status;
WCHAR Buffer[50];
HANDLE FileHandle;
UCHAR DriveLetter;
BOOLEAN SystemFound;
IO_STATUS_BLOCK StatusBlock;
PARTITION_TYPE PartitionType;
ANSI_STRING StringA1, StringA2;
PSTR Buffer1, Buffer2, LoadOptions;
OBJECT_ATTRIBUTES ObjectAttributes;
PDRIVE_LAYOUT_INFORMATION LayoutInfo;
PCONFIGURATION_INFORMATION ConfigInfo;
UNICODE_STRING StringU1, StringU2, StringU3;
ULONG Increment, DiskCount, RealDiskCount, HarddiskCount, PartitionCount, SystemPartition;
PAGED_CODE();
/* Get our disk count */
ConfigInfo = IoGetConfigurationInformation();
DiskCount = ConfigInfo->DiskCount;
RealDiskCount = 0;
/* Allocate two generic string buffers we'll use and reuser later on */
Buffer1 = ExAllocatePoolWithTag(NonPagedPool, 128, TAG_FSTUB);
Buffer2 = ExAllocatePoolWithTag(NonPagedPool, 64, TAG_FSTUB);
if (Buffer1 == NULL || Buffer2 == NULL)
{
KeBugCheck(ASSIGN_DRIVE_LETTERS_FAILED);
}
/* In case of a remote boot, setup system path */
if (IoRemoteBootClient)
{
PSTR Last, Saved;
/* Find last \ */
Last = strrchr(LoaderBlock->NtBootPathName, '\\');
Saved = NULL;
/* Misformed name, fail */
if (Last == NULL)
{
KeBugCheck(ASSIGN_DRIVE_LETTERS_FAILED);
}
/* In case the name was terminated by a \... */
if (Last[1] == ANSI_NULL)
{
/* Erase it, save position and find the previous \ */
*Last = ANSI_NULL;
Saved = Last;
Last = strrchr(LoaderBlock->NtBootPathName, '\\');
*Saved = '\\';
}
/* Misformed name, fail */
if (Last == NULL)
{
KeBugCheck(ASSIGN_DRIVE_LETTERS_FAILED);
}
/* For a remote boot, assign X drive letter */
NtSystemPath[0] = 'X';
NtSystemPath[1] = ':';
/* And copy the end of the boot path */
strcpy((PSTR)&NtSystemPath[2], Last);
/* If we had to remove the trailing \, remove it here too */
if (Saved != NULL)
{
NtSystemPath[strlen((PSTR)NtSystemPath) - 1] = ANSI_NULL;
}
/* Setup output string */
RtlInitString(NtSystemPathString, (PSTR)NtSystemPath);
}
/* For each of our disks, create the physical device DOS device */
Increment = 0;
if (DiskCount != 0)
{
for (i = 0; i < DiskCount; ++i)
{
/* Setup the origin name */
sprintf(Buffer1, "\\Device\\Harddisk%d\\Partition%d", i, 0);
RtlInitAnsiString(&StringA1, Buffer1);
if (!NT_SUCCESS(RtlAnsiStringToUnicodeString(&StringU1, &StringA1, TRUE)))
{
/* We cannot fail */
KeBugCheck(ASSIGN_DRIVE_LETTERS_FAILED);
}
/* Open the device */
InitializeObjectAttributes(&ObjectAttributes,
&StringU1,
OBJ_CASE_INSENSITIVE,
NULL,
NULL);
Status = ZwOpenFile(&FileHandle,
SYNCHRONIZE | FILE_READ_DATA,
&ObjectAttributes,
&StatusBlock,
FILE_SHARE_READ,
FILE_SYNCHRONOUS_IO_NONALERT);
if (NT_SUCCESS(Status))
{
/* If we managed, create the link */
sprintf(Buffer2, "\\DosDevices\\PhysicalDrive%d", i);
RtlInitAnsiString(&StringA2, Buffer2);
Status = RtlAnsiStringToUnicodeString(&StringU2, &StringA2, TRUE);
if (NT_SUCCESS(Status))
{
IoCreateSymbolicLink(&StringU2, &StringU1);
RtlFreeUnicodeString(&StringU2);
}
ZwClose(FileHandle);
RealDiskCount = i + 1;
}
RtlFreeUnicodeString(&StringU1);
if (!NT_SUCCESS(Status))
{
if (Increment < 50)
{
++Increment;
++DiskCount;
}
}
}
}
/* We done for our buffers */
ExFreePoolWithTag(Buffer1, TAG_FSTUB);
ExFreePoolWithTag(Buffer2, TAG_FSTUB);
/* Upcase our load options, if any */
if (LoaderBlock->LoadOptions != NULL)
{
LoadOptions = _strupr(LoaderBlock->LoadOptions);
}
else
{
LoadOptions = NULL;
}
/* If we boot with /MININT (system hive as volatile) option, assign X letter to boot device */
if (LoadOptions != NULL &&
strstr(LoadOptions, "MININT") != 0 &&
NT_SUCCESS(RtlAnsiStringToUnicodeString(&StringU1, NtDeviceName, TRUE)))
{
if (NT_SUCCESS(HalpSetMountLetter(&StringU1, 'X')))
{
*NtSystemPath = 'X';
}
RtlFreeUnicodeString(&StringU1);
}
/* Compute our disks derangements */
DiskCount -= Increment;
if (RealDiskCount > DiskCount)
{
DiskCount = RealDiskCount;
}
Devices = IopComputeHarddiskDerangements(DiskCount);
/* Now, start browsing all our disks for assigning drive letters
* Here, we'll only handle boot partition and primary partitions
*/
HarddiskCount = 0;
for (i = 0; i < DiskCount; ++i)
{
/* Get device ID according to derangements map */
if (Devices != NULL)
{
HarddiskCount = Devices[i];
}
/* Query disk layout */
swprintf(Buffer, L"\\Device\\Harddisk%d\\Partition0", HarddiskCount);
RtlInitUnicodeString(&StringU1, Buffer);
if (!NT_SUCCESS(HalpQueryDriveLayout(&StringU1, &LayoutInfo)))
{
LayoutInfo = NULL;
}
/* Assume we didn't find system */
SystemFound = FALSE;
swprintf(Buffer, L"\\Device\\Harddisk%d\\Partition%d", HarddiskCount, 1);
RtlInitUnicodeString(&StringU1, Buffer);
/* Query partition info for our disk */
if (!NT_SUCCESS(HalpQueryPartitionType(&StringU1, LayoutInfo, &PartitionType)))
{
/* It failed, retry for all the partitions */
for (PartitionCount = 1; ; ++PartitionCount)
{
swprintf(Buffer, L"\\Device\\Harddisk%d\\Partition%d", HarddiskCount, PartitionCount);
RtlInitUnicodeString(&StringU1, Buffer);
if (!NT_SUCCESS(HalpQueryPartitionType(&StringU1, LayoutInfo, &PartitionType)))
{
break;
}
/* We found a primary partition, assign a drive letter */
if (PartitionType == PrimaryPartition)
{
HalpNextDriveLetter(&StringU1, NtDeviceName, NtSystemPath, 0);
break;
}
}
}
else
{
/* All right */
for (PartitionCount = 2; ; ++PartitionCount)
{
/* If our partition is bootable (MBR) or data (GPT), that's system partition */
if (PartitionType == BootablePartition || PartitionType == DataPartition)
{
SystemFound = TRUE;
/* Assign a drive letter and stop here if MBR */
HalpNextDriveLetter(&StringU1, NtDeviceName, NtSystemPath, 0);
if (PartitionType == BootablePartition)
{
break;
}
}
/* Keep looping on all the partitions */
swprintf(Buffer, L"\\Device\\Harddisk%d\\Partition%d", HarddiskCount, PartitionCount);
RtlInitUnicodeString(&StringU1, Buffer);
if (!NT_SUCCESS(HalpQueryPartitionType(&StringU1, LayoutInfo, &PartitionType)))
{
/* Mount every primary partition if we didn't find system */
if (!SystemFound)
{
for (PartitionCount = 1; ; ++PartitionCount)
{
swprintf(Buffer, L"\\Device\\Harddisk%d\\Partition%d", HarddiskCount, PartitionCount);
RtlInitUnicodeString(&StringU1, Buffer);
if (!NT_SUCCESS(HalpQueryPartitionType(&StringU1, LayoutInfo, &PartitionType)))
{
break;
}
if (PartitionType == PrimaryPartition)
{
HalpNextDriveLetter(&StringU1, NtDeviceName, NtSystemPath, 0);
break;
}
}
}
break;
}
}
}
/* Free layout, we'll reallocate it for next device */
if (LayoutInfo != NULL)
{
ExFreePoolWithTag(LayoutInfo, TAG_FSTUB);
}
HarddiskCount = i + 1;
}
/* Now, assign logical partitions */
for (i = 0; i < DiskCount; ++i)
{
/* Get device ID according to derangements map */
if (Devices != NULL)
{
HarddiskCount = Devices[i];
}
else
{
HarddiskCount = i;
}
/* Query device layout */
swprintf(Buffer, L"\\Device\\Harddisk%d\\Partition0", HarddiskCount);
RtlInitUnicodeString(&StringU1, Buffer);
if (!NT_SUCCESS(HalpQueryDriveLayout(&StringU1, &LayoutInfo)))
{
LayoutInfo = NULL;
}
/* And assign drive letter to logical partitions */
for (PartitionCount = 1; ; ++PartitionCount)
{
swprintf(Buffer, L"\\Device\\Harddisk%d\\Partition%d", HarddiskCount, PartitionCount);
RtlInitUnicodeString(&StringU1, Buffer);
if (!NT_SUCCESS(HalpQueryPartitionType(&StringU1, LayoutInfo, &PartitionType)))
{
break;
}
if (PartitionType == LogicalPartition)
{
HalpNextDriveLetter(&StringU1, NtDeviceName, NtSystemPath, 0);
}
}
/* Free layout, we'll reallocate it for next device */
if (LayoutInfo != NULL)
{
ExFreePoolWithTag(LayoutInfo, 0);
}
}
/* Now, assign drive letters to everything else */
for (i = 0; i < DiskCount; ++i)
{
/* Get device ID according to derangements map */
if (Devices != NULL)
{
HarddiskCount = Devices[i];
}
else
{
HarddiskCount = i;
}
/* Query device layout */
swprintf(Buffer, L"\\Device\\Harddisk%d\\Partition0", HarddiskCount);
RtlInitUnicodeString(&StringU1, Buffer);
if (!NT_SUCCESS(HalpQueryDriveLayout(&StringU1, &LayoutInfo)))
{
LayoutInfo = NULL;
}
/* Save system partition if any */
SystemPartition = 0;
for (PartitionCount = 1; ; ++PartitionCount)
{
swprintf(Buffer, L"\\Device\\Harddisk%d\\Partition%d", HarddiskCount, PartitionCount);
RtlInitUnicodeString(&StringU1, Buffer);
if (!NT_SUCCESS(HalpQueryPartitionType(&StringU1, LayoutInfo, &PartitionType)))
{
break;
}
if ((PartitionType == BootablePartition || PartitionType == PrimaryPartition) && (SystemPartition == 0))
{
SystemPartition = PartitionCount;
}
}
/* And assign drive letter to anything but system partition */
for (PartitionCount = 1; ; ++PartitionCount)
{
if (PartitionCount != SystemPartition)
{
swprintf(Buffer, L"\\Device\\Harddisk%d\\Partition%d", HarddiskCount, PartitionCount);
RtlInitUnicodeString(&StringU1, Buffer);
if (!NT_SUCCESS(HalpQueryPartitionType(&StringU1, LayoutInfo, &PartitionType)))
{
if (LayoutInfo != NULL)
{
ExFreePoolWithTag(LayoutInfo, 0);
}
break;
}
if (PartitionType == PrimaryPartition || PartitionType == FtPartition)
{
HalpNextDriveLetter(&StringU1, NtDeviceName, NtSystemPath, 0);
}
}
}
}
/* We're done with disks, if we have a device map, free it */
if (Devices != NULL)
{
ExFreePoolWithTag(Devices, TAG_FSTUB);
}
/* Now, assign drive letter to floppy drives */
for (i = 0; i < ConfigInfo->FloppyCount; ++i)
{
swprintf(Buffer, L"\\Device\\Floppy%d", i);
RtlInitUnicodeString(&StringU1, Buffer);
if (HalpIsOldStyleFloppy(&StringU1))
{
HalpNextDriveLetter(&StringU1, NtDeviceName, NtSystemPath, TRUE);
}
}
/* And CD drives */
for (i = 0; i < ConfigInfo->CdRomCount; ++i)
{
swprintf(Buffer, L"\\Device\\CdRom%d", i);
RtlInitUnicodeString(&StringU1, Buffer);
HalpNextDriveLetter(&StringU1, NtDeviceName, NtSystemPath, TRUE);
}
/* If not remote boot, handle NtDeviceName */
if (!IoRemoteBootClient && NT_SUCCESS(RtlAnsiStringToUnicodeString(&StringU1, NtDeviceName, TRUE)))
{
/* Assign it a drive letter */
DriveLetter = HalpNextDriveLetter(&StringU1, NULL, NULL, TRUE);
if (DriveLetter != 0)
{
if (DriveLetter != 0xFF)
{
*NtSystemPath = DriveLetter;
}
}
/* If it fails through mount manager, retry manually */
else
{
RtlInitUnicodeString(&StringU2, L"\\Device\\Floppy");
RtlInitUnicodeString(&StringU3, L"\\Device\\CdRom");
if (RtlPrefixUnicodeString(&StringU2, &StringU1, TRUE))
{
DriveLetter = 'A';
}
else if (RtlPrefixUnicodeString(&StringU3, &StringU1, TRUE))
{
DriveLetter = 'D';
}
else
{
DriveLetter = 'C';
}
/* Try any drive letter */
while (HalpSetMountLetter(&StringU1, DriveLetter) != STATUS_SUCCESS)
{
++DriveLetter;
if (DriveLetter > 'Z')
{
break;
}
}
/* If we're beyond Z (ie, no slot left) */
if (DriveLetter > 'Z')
{
/* Delete Z, and reuse it for system */
HalpDeleteMountLetter('Z');
HalpSetMountLetter(&StringU1, 'Z');
*NtSystemPath = 'Z';
}
else
{
/* Return matching drive letter */
*NtSystemPath = DriveLetter;
}
}
RtlFreeUnicodeString(&StringU1);
}
/* Enable auto assignement for mountmgr */
HalpEnableAutomaticDriveLetterAssignment();
}
/* PRIVATE FUNCTIONS *********************************************************/
NTSTATUS
NTAPI
HalpGetFullGeometry(IN PDEVICE_OBJECT DeviceObject,
IN PDISK_GEOMETRY Geometry,
OUT PULONGLONG RealSectorCount)
{
PIRP Irp;
IO_STATUS_BLOCK IoStatusBlock;
PKEVENT Event;
NTSTATUS Status;
PARTITION_INFORMATION PartitionInfo;
PAGED_CODE();
/* Allocate a non-paged event */
Event = ExAllocatePoolWithTag(NonPagedPool,
sizeof(KEVENT),
TAG_FILE_SYSTEM);
if (!Event) return STATUS_INSUFFICIENT_RESOURCES;
/* Initialize it */
KeInitializeEvent(Event, NotificationEvent, FALSE);
/* Build the IRP */
Irp = IoBuildDeviceIoControlRequest(IOCTL_DISK_GET_DRIVE_GEOMETRY,
DeviceObject,
NULL,
0UL,
Geometry,
sizeof(DISK_GEOMETRY),
FALSE,
Event,
&IoStatusBlock);
if (!Irp)
{
/* Fail, free the event */
ExFreePoolWithTag(Event, TAG_FILE_SYSTEM);
return STATUS_INSUFFICIENT_RESOURCES;
}
/* Call the driver and check if it's pending */
Status = IoCallDriver(DeviceObject, Irp);
if (Status == STATUS_PENDING)
{
/* Wait on the driver */
KeWaitForSingleObject(Event, Executive, KernelMode, FALSE, NULL);
Status = IoStatusBlock.Status;
}
/* Check if the driver returned success */
if(NT_SUCCESS(Status))
{
/* Build another IRP */
Irp = IoBuildDeviceIoControlRequest(IOCTL_DISK_GET_PARTITION_INFO,
DeviceObject,
NULL,
0UL,
&PartitionInfo,
sizeof(PARTITION_INFORMATION),
FALSE,
Event,
&IoStatusBlock);
if (!Irp)
{
/* Fail, free the event */
ExFreePoolWithTag(Event, TAG_FILE_SYSTEM);
return STATUS_INSUFFICIENT_RESOURCES;
}
/* Reset event */
KeClearEvent(Event);
/* Call the driver and check if it's pending */
Status = IoCallDriver(DeviceObject, Irp);
if (Status == STATUS_PENDING)
{
/* Wait on the driver */
KeWaitForSingleObject(Event, Executive, KernelMode, FALSE, NULL);
Status = IoStatusBlock.Status;
}
/* Check if the driver returned success */
if(NT_SUCCESS(Status))
{
/* Get the number of sectors */
*RealSectorCount = (PartitionInfo.PartitionLength.QuadPart /
Geometry->BytesPerSector);
}
}
/* Free the event and return the Status */
ExFreePoolWithTag(Event, TAG_FILE_SYSTEM);
return Status;
}
BOOLEAN
NTAPI
HalpIsValidPartitionEntry(IN PPARTITION_DESCRIPTOR Entry,
IN ULONGLONG MaxOffset,
IN ULONGLONG MaxSector)
{
ULONGLONG EndingSector;
PAGED_CODE();
/* Unused partitions are considered valid */
if (Entry->PartitionType == PARTITION_ENTRY_UNUSED) return TRUE;
/* Get the last sector of the partition */
EndingSector = GET_STARTING_SECTOR(Entry) + GET_PARTITION_LENGTH(Entry);
/* Check if it's more then the maximum sector */
if (EndingSector > MaxSector)
{
/* Invalid partition */
DPRINT1("FSTUB: entry is invalid\n");
DPRINT1("FSTUB: offset %#08lx\n", GET_STARTING_SECTOR(Entry));
DPRINT1("FSTUB: length %#08lx\n", GET_PARTITION_LENGTH(Entry));
DPRINT1("FSTUB: end %#I64x\n", EndingSector);
DPRINT1("FSTUB: max %#I64x\n", MaxSector);
return FALSE;
}
else if(GET_STARTING_SECTOR(Entry) > MaxOffset)
{
/* Invalid partition */
DPRINT1("FSTUB: entry is invalid\n");
DPRINT1("FSTUB: offset %#08lx\n", GET_STARTING_SECTOR(Entry));
DPRINT1("FSTUB: length %#08lx\n", GET_PARTITION_LENGTH(Entry));
DPRINT1("FSTUB: end %#I64x\n", EndingSector);
DPRINT1("FSTUB: maxOffset %#I64x\n", MaxOffset);
return FALSE;
}
/* It's fine, return success */
return TRUE;
}
VOID
NTAPI
HalpCalculateChsValues(IN PLARGE_INTEGER PartitionOffset,
IN PLARGE_INTEGER PartitionLength,
IN CCHAR ShiftCount,
IN ULONG SectorsPerTrack,
IN ULONG NumberOfTracks,
IN ULONG ConventionalCylinders,
OUT PPARTITION_DESCRIPTOR PartitionDescriptor)
{
LARGE_INTEGER FirstSector, SectorCount;
ULONG LastSector, Remainder, SectorsPerCylinder;
ULONG StartingCylinder, EndingCylinder;
ULONG StartingTrack, EndingTrack;
ULONG StartingSector, EndingSector;
PAGED_CODE();
/* Calculate the number of sectors for each cylinder */
SectorsPerCylinder = SectorsPerTrack * NumberOfTracks;
/* Calculate the first sector, and the sector count */
FirstSector.QuadPart = PartitionOffset->QuadPart >> ShiftCount;
SectorCount.QuadPart = PartitionLength->QuadPart >> ShiftCount;
/* Now calculate the last sector */
LastSector = FirstSector.LowPart + SectorCount.LowPart - 1;
/* Calculate the first and last cylinders */
StartingCylinder = FirstSector.LowPart / SectorsPerCylinder;
EndingCylinder = LastSector / SectorsPerCylinder;
/* Set the default number of cylinders */
if (!ConventionalCylinders) ConventionalCylinders = 1024;
/* Normalize the values */
if (StartingCylinder >= ConventionalCylinders)
{
/* Set the maximum to 1023 */
StartingCylinder = ConventionalCylinders - 1;
}
if (EndingCylinder >= ConventionalCylinders)
{
/* Set the maximum to 1023 */
EndingCylinder = ConventionalCylinders - 1;
}
/* Calculate the starting head and sector that still remain */
Remainder = FirstSector.LowPart % SectorsPerCylinder;
StartingTrack = Remainder / SectorsPerTrack;
StartingSector = Remainder % SectorsPerTrack;
/* Calculate the ending head and sector that still remain */
Remainder = LastSector % SectorsPerCylinder;
EndingTrack = Remainder / SectorsPerTrack;
EndingSector = Remainder % SectorsPerTrack;
/* Set cylinder data for the MSB */
PartitionDescriptor->StartingCylinderMsb = (UCHAR)StartingCylinder;
PartitionDescriptor->EndingCylinderMsb = (UCHAR)EndingCylinder;
/* Set the track data */
PartitionDescriptor->StartingTrack = (UCHAR)StartingTrack;
PartitionDescriptor->EndingTrack = (UCHAR)EndingTrack;
/* Update cylinder data for the LSB */
StartingCylinder = ((StartingSector + 1) & 0x3F) |
((StartingCylinder >> 2) & 0xC0);
EndingCylinder = ((EndingSector + 1) & 0x3F) |
((EndingCylinder >> 2) & 0xC0);
/* Set the cylinder data for the LSB */
PartitionDescriptor->StartingCylinderLsb = (UCHAR)StartingCylinder;
PartitionDescriptor->EndingCylinderLsb = (UCHAR)EndingCylinder;
}
VOID
FASTCALL
xHalGetPartialGeometry(IN PDEVICE_OBJECT DeviceObject,
IN PULONG ConventionalCylinders,
IN PLONGLONG DiskSize)
{
PDISK_GEOMETRY DiskGeometry = NULL;
PIO_STATUS_BLOCK IoStatusBlock = NULL;
PKEVENT Event = NULL;
PIRP Irp;
NTSTATUS Status;
/* Set defaults */
*ConventionalCylinders = 0;
*DiskSize = 0;
/* Allocate the structure in nonpaged pool */
DiskGeometry = ExAllocatePoolWithTag(NonPagedPool,
sizeof(DISK_GEOMETRY),
TAG_FILE_SYSTEM);
if (!DiskGeometry) goto Cleanup;
/* Allocate the status block in nonpaged pool */
IoStatusBlock = ExAllocatePoolWithTag(NonPagedPool,
sizeof(IO_STATUS_BLOCK),
TAG_FILE_SYSTEM);
if (!IoStatusBlock) goto Cleanup;
/* Allocate the event in nonpaged pool too */
Event = ExAllocatePoolWithTag(NonPagedPool,
sizeof(KEVENT),
TAG_FILE_SYSTEM);
if (!Event) goto Cleanup;
/* Initialize the event */
KeInitializeEvent(Event, NotificationEvent, FALSE);
/* Build the IRP */
Irp = IoBuildDeviceIoControlRequest(IOCTL_DISK_GET_DRIVE_GEOMETRY,
DeviceObject,
NULL,
0,
DiskGeometry,
sizeof(DISK_GEOMETRY),
FALSE,
Event,
IoStatusBlock);
if (!Irp) goto Cleanup;
/* Now call the driver */
Status = IoCallDriver(DeviceObject, Irp);
if (Status == STATUS_PENDING)
{
/* Wait for it to complete */
KeWaitForSingleObject(Event, Executive, KernelMode, FALSE, NULL);
Status = IoStatusBlock->Status;
}
/* Check driver status */
if (NT_SUCCESS(Status))
{
/* Return the cylinder count */
*ConventionalCylinders = DiskGeometry->Cylinders.LowPart;
/* Make sure it's not larger then 1024 */
if (DiskGeometry->Cylinders.LowPart >= 1024)
{
/* Otherwise, normalize the value */
*ConventionalCylinders = 1024;
}
/* Calculate the disk size */
*DiskSize = DiskGeometry->Cylinders.QuadPart *
DiskGeometry->TracksPerCylinder *
DiskGeometry->SectorsPerTrack *
DiskGeometry->BytesPerSector;
}
Cleanup:
/* Free all the pointers */
if (Event) ExFreePoolWithTag(Event, TAG_FILE_SYSTEM);
if (IoStatusBlock) ExFreePoolWithTag(IoStatusBlock, TAG_FILE_SYSTEM);
if (DiskGeometry) ExFreePoolWithTag(DiskGeometry, TAG_FILE_SYSTEM);
return;
}
VOID
FASTCALL
xHalExamineMBR(IN PDEVICE_OBJECT DeviceObject,
IN ULONG SectorSize,
IN ULONG MbrTypeIdentifier,
OUT PVOID *MbrBuffer)
{
LARGE_INTEGER Offset;
PUCHAR Buffer;
ULONG BufferSize;
KEVENT Event;
IO_STATUS_BLOCK IoStatusBlock;
PIRP Irp;
PPARTITION_DESCRIPTOR PartitionDescriptor;
NTSTATUS Status;
PIO_STACK_LOCATION IoStackLocation;
Offset.QuadPart = 0;
/* Assume failure */
*MbrBuffer = NULL;
/* Normalize the buffer size */
BufferSize = max(SectorSize, 512);
/* Allocate the buffer */
Buffer = ExAllocatePoolWithTag(NonPagedPool,
PAGE_SIZE > BufferSize ?
PAGE_SIZE : BufferSize,
TAG_FILE_SYSTEM);
if (!Buffer) return;
/* Initialize the Event */
KeInitializeEvent(&Event, NotificationEvent, FALSE);
/* Build the IRP */
Irp = IoBuildSynchronousFsdRequest(IRP_MJ_READ,
DeviceObject,
Buffer,
BufferSize,
&Offset,
&Event,
&IoStatusBlock);
if (!Irp)
{
/* Failed */
ExFreePoolWithTag(Buffer, TAG_FILE_SYSTEM);
return;
}
/* Make sure to override volume verification */
IoStackLocation = IoGetNextIrpStackLocation(Irp);
IoStackLocation->Flags |= SL_OVERRIDE_VERIFY_VOLUME;
/* Call the driver */
Status = IoCallDriver(DeviceObject, Irp);
if (Status == STATUS_PENDING)
{
/* Wait for completion */
KeWaitForSingleObject(&Event, Executive, KernelMode, FALSE, NULL);
Status = IoStatusBlock.Status;
}
/* Check driver Status */
if (NT_SUCCESS(Status))
{
/* Validate the MBR Signature */
if (((PUSHORT)Buffer)[BOOT_SIGNATURE_OFFSET] != BOOT_RECORD_SIGNATURE)
{
/* Failed */
ExFreePoolWithTag(Buffer, TAG_FILE_SYSTEM);
return;
}
/* Get the partition entry */
PartitionDescriptor = (PPARTITION_DESCRIPTOR)
&(((PUSHORT)Buffer)[PARTITION_TABLE_OFFSET]);
/* Make sure it's what the caller wanted */
if (PartitionDescriptor->PartitionType != MbrTypeIdentifier)
{
/* It's not, free our buffer */
ExFreePoolWithTag(Buffer, TAG_FILE_SYSTEM);
}
else
{
/* Check if this is a secondary entry */
if (PartitionDescriptor->PartitionType == 0x54)
{
/* Return our buffer, but at sector 63 */
*(PULONG)Buffer = 63;
*MbrBuffer = Buffer;
}
else if (PartitionDescriptor->PartitionType == 0x55)
{
/* EZ Drive, return the buffer directly */
*MbrBuffer = Buffer;
}
else
{
/* Otherwise crash on debug builds */
ASSERT(PartitionDescriptor->PartitionType == 0x55);
}
}
}
}
VOID
NTAPI
FstubFixupEfiPartition(IN PPARTITION_DESCRIPTOR PartitionDescriptor,
IN ULONGLONG MaxOffset)
{
ULONG PartitionMaxOffset, PartitionLength;
PAGED_CODE();
/* Compute partition length (according to MBR entry) */
PartitionMaxOffset = GET_STARTING_SECTOR(PartitionDescriptor) + GET_PARTITION_LENGTH(PartitionDescriptor);
/* In case the partition length goes beyond disk size... */
if (PartitionMaxOffset > MaxOffset)
{
/* Resize partition to its maximum real length */
PartitionLength = (ULONG)(PartitionMaxOffset - GET_STARTING_SECTOR(PartitionDescriptor));
SET_PARTITION_LENGTH(PartitionDescriptor, PartitionLength);
}
}
NTSTATUS
FASTCALL
xHalIoReadPartitionTable(IN PDEVICE_OBJECT DeviceObject,
IN ULONG SectorSize,
IN BOOLEAN ReturnRecognizedPartitions,
IN OUT PDRIVE_LAYOUT_INFORMATION *PartitionBuffer)
{
KEVENT Event;
IO_STATUS_BLOCK IoStatusBlock;
PIRP Irp;
PPARTITION_DESCRIPTOR PartitionDescriptor;
CCHAR Entry;
NTSTATUS Status;
PPARTITION_INFORMATION PartitionInfo;
PUCHAR Buffer = NULL;
ULONG BufferSize = 2048, InputSize;
PDRIVE_LAYOUT_INFORMATION DriveLayoutInfo = NULL;
LONG j = -1, i = -1, k;
DISK_GEOMETRY DiskGeometry;
LONGLONG EndSector, MaxSector, StartOffset;
ULONGLONG MaxOffset;
LARGE_INTEGER Offset, VolumeOffset;
BOOLEAN IsPrimary = TRUE, IsEzDrive = FALSE, MbrFound = FALSE;
BOOLEAN IsValid, IsEmpty = TRUE;
PVOID MbrBuffer;
PIO_STACK_LOCATION IoStackLocation;
UCHAR PartitionType;
LARGE_INTEGER HiddenSectors64;
VolumeOffset.QuadPart = Offset.QuadPart = 0;
PAGED_CODE();
/* Allocate the buffer */
*PartitionBuffer = ExAllocatePoolWithTag(NonPagedPool,
BufferSize,
TAG_FILE_SYSTEM);
if (!(*PartitionBuffer)) return STATUS_INSUFFICIENT_RESOURCES;
/* Normalize the buffer size */
InputSize = max(512, SectorSize);
/* Check for EZ Drive */
HalExamineMBR(DeviceObject, InputSize, 0x55, &MbrBuffer);
if (MbrBuffer)
{
/* EZ Drive found, bias the offset */
IsEzDrive = TRUE;
ExFreePoolWithTag(MbrBuffer, TAG_FILE_SYSTEM);
Offset.QuadPart = 512;
}
/* Get drive geometry */
Status = HalpGetFullGeometry(DeviceObject, &DiskGeometry, &MaxOffset);
if (!NT_SUCCESS(Status))
{
ExFreePoolWithTag(*PartitionBuffer, TAG_FILE_SYSTEM);
*PartitionBuffer = NULL;
return Status;
}
/* Get the end and maximum sector */
EndSector = MaxOffset;
MaxSector = MaxOffset << 1;
DPRINT("FSTUB: MaxOffset = %#I64x, MaxSector = %#I64x\n",
MaxOffset, MaxSector);
/* Allocate our buffer */
Buffer = ExAllocatePoolWithTag(NonPagedPool, InputSize, TAG_FILE_SYSTEM);
if (!Buffer)
{
/* Fail, free the input buffer */
ExFreePoolWithTag(*PartitionBuffer, TAG_FILE_SYSTEM);
*PartitionBuffer = NULL;
return STATUS_INSUFFICIENT_RESOURCES;
}
/* Start partition loop */
do
{
/* Assume the partition is valid */
IsValid = TRUE;
/* Initialize the event */
KeInitializeEvent(&Event, NotificationEvent, FALSE);
/* Clear the buffer and build the IRP */
RtlZeroMemory(Buffer, InputSize);
Irp = IoBuildSynchronousFsdRequest(IRP_MJ_READ,
DeviceObject,
Buffer,
InputSize,
&Offset,
&Event,
&IoStatusBlock);
if (!Irp)
{
/* Failed */
Status = STATUS_INSUFFICIENT_RESOURCES;
break;
}
/* Make sure to disable volume verification */
IoStackLocation = IoGetNextIrpStackLocation(Irp);
IoStackLocation->Flags |= SL_OVERRIDE_VERIFY_VOLUME;
/* Call the driver */
Status = IoCallDriver(DeviceObject, Irp);
if (Status == STATUS_PENDING)
{
/* Wait for completion */
KeWaitForSingleObject(&Event, Executive, KernelMode, FALSE, NULL);
Status = IoStatusBlock.Status;
}
/* Normalize status code and check for failure */
if (Status == STATUS_NO_DATA_DETECTED) Status = STATUS_SUCCESS;
if (!NT_SUCCESS(Status)) break;
/* If we biased for EZ-Drive, unbias now */
if (IsEzDrive && (Offset.QuadPart == 512)) Offset.QuadPart = 0;
/* Make sure this is a valid MBR */
if (((PUSHORT)Buffer)[BOOT_SIGNATURE_OFFSET] != BOOT_RECORD_SIGNATURE)
{
/* It's not, fail */
DPRINT1("FSTUB: (IoReadPartitionTable) No 0xaa55 found in "
"partition table %d\n", j + 1);
break;
}
/* At this point we have a valid MBR */
MbrFound = TRUE;
/* Check if we weren't given an offset */
if (!Offset.QuadPart)
{
/* Then read the signature off the disk */
(*PartitionBuffer)->Signature = ((PULONG)Buffer)[PARTITION_TABLE_OFFSET / 2 - 1];
}
/* Get the partition descriptor array */
PartitionDescriptor = (PPARTITION_DESCRIPTOR)
&(((PUSHORT)Buffer)[PARTITION_TABLE_OFFSET]);
/* Start looping partitions */
j++;
DPRINT("FSTUB: Partition Table %d:\n", j);
for (Entry = 1, k = 0; Entry <= 4; Entry++, PartitionDescriptor++)
{
/* Get the partition type */
PartitionType = PartitionDescriptor->PartitionType;
/* Print debug messages */
DPRINT("Partition Entry %d,%d: type %#x %s\n",
j,
Entry,
PartitionType,
(PartitionDescriptor->ActiveFlag) ? "Active" : "");
DPRINT("\tOffset %#08lx for %#08lx Sectors\n",
GET_STARTING_SECTOR(PartitionDescriptor),
GET_PARTITION_LENGTH(PartitionDescriptor));
/* Check whether we're facing a protective MBR */
if (PartitionType == EFI_PMBR_OSTYPE_EFI)
{
/* Partition length might be bigger than disk size */
FstubFixupEfiPartition(PartitionDescriptor,
MaxOffset);
}
/* Make sure that the partition is valid, unless it's the first */
if (!(HalpIsValidPartitionEntry(PartitionDescriptor,
MaxOffset,
MaxSector)) && (j == 0))
{
/* It's invalid, so fail */
IsValid = FALSE;
break;
}
/* Check if it's a container */
if (IsContainerPartition(PartitionType))
{
/* Increase the count of containers */
if (++k != 1)
{
/* More then one table is invalid */
DPRINT1("FSTUB: Multiple container partitions found in "
"partition table %d\n - table is invalid\n",
j);
IsValid = FALSE;
break;
}
}
/* Check if the partition is supposedly empty */
if (IsEmpty)
{
/* But check if it actually has a start and/or length */
if ((GET_STARTING_SECTOR(PartitionDescriptor)) ||
(GET_PARTITION_LENGTH(PartitionDescriptor)))
{
/* So then it's not really empty */
IsEmpty = FALSE;
}
}
/* Check if the caller wanted only recognized partitions */
if (ReturnRecognizedPartitions)
{
/* Then check if this one is unused, or a container */
if ((PartitionType == PARTITION_ENTRY_UNUSED) ||
IsContainerPartition(PartitionType))
{
/* Skip it, since the caller doesn't want it */
continue;
}
}
/* Increase the structure count and check if they can fit */
if ((sizeof(DRIVE_LAYOUT_INFORMATION) +
(++i * sizeof(PARTITION_INFORMATION))) >
BufferSize)
{
/* Allocate a new buffer that's twice as big */
DriveLayoutInfo = ExAllocatePoolWithTag(NonPagedPool,
BufferSize << 1,
TAG_FILE_SYSTEM);
if (!DriveLayoutInfo)
{
/* Out of memory, unto this extra structure */
--i;
Status = STATUS_INSUFFICIENT_RESOURCES;
break;
}
/* Copy the contents of the old buffer */
RtlMoveMemory(DriveLayoutInfo,
*PartitionBuffer,
BufferSize);
/* Free the old buffer and set this one as the new one */
ExFreePoolWithTag(*PartitionBuffer, TAG_FILE_SYSTEM);
*PartitionBuffer = DriveLayoutInfo;
/* Double the size */
BufferSize <<= 1;
}
/* Now get the current structure being filled and initialize it */
PartitionInfo = &(*PartitionBuffer)->PartitionEntry[i];
PartitionInfo->PartitionType = PartitionType;
PartitionInfo->RewritePartition = FALSE;
/* Check if we're dealing with a partition that's in use */
if (PartitionType != PARTITION_ENTRY_UNUSED)
{
/* Check if it's bootable */
PartitionInfo->BootIndicator = PartitionDescriptor->
ActiveFlag & 0x80 ?
TRUE : FALSE;
/* Check if its' a container */
if (IsContainerPartition(PartitionType))
{
/* Then don't recognize it and use the volume offset */
PartitionInfo->RecognizedPartition = FALSE;
StartOffset = VolumeOffset.QuadPart;
}
else
{
/* Then recognize it and use the partition offset */
PartitionInfo->RecognizedPartition = TRUE;
StartOffset = Offset.QuadPart;
}
/* Get the starting offset */
PartitionInfo->StartingOffset.QuadPart =
StartOffset +
UInt32x32To64(GET_STARTING_SECTOR(PartitionDescriptor),
SectorSize);
/* Calculate the number of hidden sectors */
HiddenSectors64.QuadPart = (PartitionInfo->
StartingOffset.QuadPart -
StartOffset) /
SectorSize;
PartitionInfo->HiddenSectors = HiddenSectors64.LowPart;
/* Get the partition length */
PartitionInfo->PartitionLength.QuadPart =
UInt32x32To64(GET_PARTITION_LENGTH(PartitionDescriptor),
SectorSize);
/* Get the partition number */
PartitionInfo->PartitionNumber = (!IsContainerPartition(PartitionType)) ? i + 1 : 0;
}
else
{
/* Otherwise, clear all the relevant fields */
PartitionInfo->BootIndicator = FALSE;
PartitionInfo->RecognizedPartition = FALSE;
PartitionInfo->StartingOffset.QuadPart = 0;
PartitionInfo->PartitionLength.QuadPart = 0;
PartitionInfo->HiddenSectors = 0;
PartitionInfo->PartitionNumber = 0;
}
}
/* Finish debug log, and check for failure */
DPRINT("\n");
if (!NT_SUCCESS(Status)) break;
/* Also check if we hit an invalid entry here */
if (!IsValid)
{
/* We did, so break out of the loop minus one entry */
j--;
break;
}
/* Reset the offset */
Offset.QuadPart = 0;
/* Go back to the descriptor array and loop it */
PartitionDescriptor = (PPARTITION_DESCRIPTOR)
&(((PUSHORT)Buffer)[PARTITION_TABLE_OFFSET]);
for (Entry = 1; Entry <= 4; Entry++, PartitionDescriptor++)
{
/* Check if this is a container partition, since we skipped them */
if (IsContainerPartition(PartitionDescriptor->PartitionType))
{
/* Get its offset */
Offset.QuadPart = VolumeOffset.QuadPart +
UInt32x32To64(
GET_STARTING_SECTOR(PartitionDescriptor),
SectorSize);
/* If this is a primary partition, this is the volume offset */
if (IsPrimary) VolumeOffset = Offset;
/* Also update the maximum sector */
MaxSector = GET_PARTITION_LENGTH(PartitionDescriptor);
DPRINT1("FSTUB: MaxSector now = %I64d\n", MaxSector);
break;
}
}
/* Loop the next partitions, which are not primary anymore */
IsPrimary = FALSE;
} while (Offset.HighPart | Offset.LowPart);
/* Check if this is a removable device that's probably a super-floppy */
if ((DiskGeometry.MediaType == RemovableMedia) &&
(j == 0) && (MbrFound) && (IsEmpty))
{
PBOOT_SECTOR_INFO BootSectorInfo = (PBOOT_SECTOR_INFO)Buffer;
/* Read the jump bytes to detect super-floppy */
if ((BootSectorInfo->JumpByte[0] == 0xeb) ||
(BootSectorInfo->JumpByte[0] == 0xe9))
{
/* Super floppes don't have typical MBRs, so skip them */
DPRINT1("FSTUB: Jump byte %#x found along with empty partition "
"table - disk is a super floppy and has no valid MBR\n",
BootSectorInfo->JumpByte);
j = -1;
}
}
/* Check if we're still at partition -1 */
if (j == -1)
{
/* The likely cause is the super floppy detection above */
if ((MbrFound) || (DiskGeometry.MediaType == RemovableMedia))
{
/* Print out debugging information */
DPRINT1("FSTUB: Drive %#p has no valid MBR. Make it into a "
"super-floppy\n",
DeviceObject);
DPRINT1("FSTUB: Drive has %I64d sectors and is %#016I64x "
"bytes large\n",
EndSector, EndSector * DiskGeometry.BytesPerSector);
/* We should at least have some sectors */
if (EndSector > 0)
{
/* Get the entry we'll use */
PartitionInfo = &(*PartitionBuffer)->PartitionEntry[0];
/* Fill it out with data for a super-floppy */
PartitionInfo->RewritePartition = FALSE;
PartitionInfo->RecognizedPartition = TRUE;
PartitionInfo->PartitionType = PARTITION_FAT_16;
PartitionInfo->BootIndicator = FALSE;
PartitionInfo->HiddenSectors = 0;
PartitionInfo->StartingOffset.QuadPart = 0;
PartitionInfo->PartitionLength.QuadPart = (EndSector *
DiskGeometry.
BytesPerSector);
/* FIXME: REACTOS HACK */
PartitionInfo->PartitionNumber = 0;
/* Set the signature and set the count back to 0 */
(*PartitionBuffer)->Signature = 1;
i = 0;
}
}
else
{
/* Otherwise, this isn't a super floppy, so set an invalid count */
i = -1;
}
}
/* Set the partition count */
(*PartitionBuffer)->PartitionCount = ++i;
/* If we have no count, delete the signature */
if (!i) (*PartitionBuffer)->Signature = 0;
/* Free the buffer and check for success */
if (Buffer) ExFreePoolWithTag(Buffer, TAG_FILE_SYSTEM);
if (!NT_SUCCESS(Status))
{
ExFreePoolWithTag(*PartitionBuffer, TAG_FILE_SYSTEM);
*PartitionBuffer = NULL;
}
/* Return status */
return Status;
}
NTSTATUS
FASTCALL
xHalIoSetPartitionInformation(IN PDEVICE_OBJECT DeviceObject,
IN ULONG SectorSize,
IN ULONG PartitionNumber,
IN ULONG PartitionType)
{
PIRP Irp;
KEVENT Event;
IO_STATUS_BLOCK IoStatusBlock;
NTSTATUS Status;
LARGE_INTEGER Offset, VolumeOffset;
PUCHAR Buffer = NULL;
ULONG BufferSize;
ULONG i = 0;
ULONG Entry;
PPARTITION_DESCRIPTOR PartitionDescriptor;
BOOLEAN IsPrimary = TRUE, IsEzDrive = FALSE;
PVOID MbrBuffer;
PIO_STACK_LOCATION IoStackLocation;
VolumeOffset.QuadPart = Offset.QuadPart = 0;
PAGED_CODE();
/* Normalize the buffer size */
BufferSize = max(512, SectorSize);
/* Check for EZ Drive */
HalExamineMBR(DeviceObject, BufferSize, 0x55, &MbrBuffer);
if (MbrBuffer)
{
/* EZ Drive found, bias the offset */
IsEzDrive = TRUE;
ExFreePoolWithTag(MbrBuffer, TAG_FILE_SYSTEM);
Offset.QuadPart = 512;
}
/* Allocate our partition buffer */
Buffer = ExAllocatePoolWithTag(NonPagedPool, PAGE_SIZE, TAG_FILE_SYSTEM);
if (!Buffer) return STATUS_INSUFFICIENT_RESOURCES;
/* Initialize the event we'll use and loop partitions */
KeInitializeEvent(&Event, NotificationEvent, FALSE);
do
{
/* Reset the event since we reuse it */
KeClearEvent(&Event);
/* Build the read IRP */
Irp = IoBuildSynchronousFsdRequest(IRP_MJ_READ,
DeviceObject,
Buffer,
BufferSize,
&Offset,
&Event,
&IoStatusBlock);
if (!Irp)
{
/* Fail */
Status = STATUS_INSUFFICIENT_RESOURCES;
break;
}
/* Make sure to disable volume verification */
IoStackLocation = IoGetNextIrpStackLocation(Irp);
IoStackLocation->Flags |= SL_OVERRIDE_VERIFY_VOLUME;
/* Call the driver */
Status = IoCallDriver(DeviceObject, Irp);
if (Status == STATUS_PENDING)
{
/* Wait for completion */
KeWaitForSingleObject(&Event, Executive, KernelMode, FALSE, NULL);
Status = IoStatusBlock.Status;
}
/* Check for failure */
if (!NT_SUCCESS(Status)) break;
/* If we biased for EZ-Drive, unbias now */
if (IsEzDrive && (Offset.QuadPart == 512)) Offset.QuadPart = 0;
/* Make sure this is a valid MBR */
if (((PUSHORT)Buffer)[BOOT_SIGNATURE_OFFSET] != BOOT_RECORD_SIGNATURE)
{
/* It's not, fail */
Status = STATUS_BAD_MASTER_BOOT_RECORD;
break;
}
/* Get the partition descriptors and loop them */
PartitionDescriptor = (PPARTITION_DESCRIPTOR)
&(((PUSHORT)Buffer)[PARTITION_TABLE_OFFSET]);
for (Entry = 1; Entry <= 4; Entry++, PartitionDescriptor++)
{
/* Check if it's unused or a container partition */
if ((PartitionDescriptor->PartitionType ==
PARTITION_ENTRY_UNUSED) ||
(IsContainerPartition(PartitionDescriptor->PartitionType)))
{
/* Go to the next one */
continue;
}
/* It's a valid partition, so increase the partition count */
if (++i == PartitionNumber)
{
/* We found a match, set the type */
PartitionDescriptor->PartitionType = (UCHAR)PartitionType;
/* Reset the reusable event */
KeClearEvent(&Event);
/* Build the write IRP */
Irp = IoBuildSynchronousFsdRequest(IRP_MJ_WRITE,
DeviceObject,
Buffer,
BufferSize,
&Offset,
&Event,
&IoStatusBlock);
if (!Irp)
{
/* Fail */
Status = STATUS_INSUFFICIENT_RESOURCES;
break;
}
/* Disable volume verification */
IoStackLocation = IoGetNextIrpStackLocation(Irp);
IoStackLocation->Flags |= SL_OVERRIDE_VERIFY_VOLUME;
/* Call the driver */
Status = IoCallDriver(DeviceObject, Irp);
if (Status == STATUS_PENDING)
{
/* Wait for completion */
KeWaitForSingleObject(&Event,
Executive,
KernelMode,
FALSE,
NULL);
Status = IoStatusBlock.Status;
}
/* We're done, break out of the loop */
break;
}
}
/* If we looped all the partitions, break out */
if (Entry <= NUM_PARTITION_TABLE_ENTRIES) break;
/* Nothing found yet, get the partition array again */
PartitionDescriptor = (PPARTITION_DESCRIPTOR)
&(((PUSHORT)Buffer)[PARTITION_TABLE_OFFSET]);
for (Entry = 1; Entry <= 4; Entry++, PartitionDescriptor++)
{
/* Check if this was a container partition (we skipped these) */
if (IsContainerPartition(PartitionDescriptor->PartitionType))
{
/* Update the partition offset */
Offset.QuadPart = VolumeOffset.QuadPart +
GET_STARTING_SECTOR(PartitionDescriptor) *
SectorSize;
/* If this was the primary partition, update the volume too */
if (IsPrimary) VolumeOffset = Offset;
break;
}
}
/* Check if we already searched all the partitions */
if (Entry > NUM_PARTITION_TABLE_ENTRIES)
{
/* Then we failed to find a good MBR */
Status = STATUS_BAD_MASTER_BOOT_RECORD;
break;
}
/* Loop the next partitions, which are not primary anymore */
IsPrimary = FALSE;
} while (i < PartitionNumber);
/* Everything done, cleanup */
if (Buffer) ExFreePoolWithTag(Buffer, TAG_FILE_SYSTEM);
return Status;
}
NTSTATUS
FASTCALL
xHalIoWritePartitionTable(IN PDEVICE_OBJECT DeviceObject,
IN ULONG SectorSize,
IN ULONG SectorsPerTrack,
IN ULONG NumberOfHeads,
IN PDRIVE_LAYOUT_INFORMATION PartitionBuffer)
{
KEVENT Event;
IO_STATUS_BLOCK IoStatusBlock;
PIRP Irp;
NTSTATUS Status = STATUS_SUCCESS;
ULONG BufferSize;
PUSHORT Buffer;
PPTE Entry;
PPARTITION_TABLE PartitionTable;
LARGE_INTEGER Offset, NextOffset, ExtendedOffset, SectorOffset;
LARGE_INTEGER StartOffset, PartitionLength;
ULONG i, j;
CCHAR k;
BOOLEAN IsEzDrive = FALSE, IsSuperFloppy = FALSE, DoRewrite = FALSE, IsMbr;
ULONG ConventionalCylinders;
LONGLONG DiskSize;
PDISK_LAYOUT DiskLayout = (PDISK_LAYOUT)PartitionBuffer;
PVOID MbrBuffer;
UCHAR PartitionType;
PIO_STACK_LOCATION IoStackLocation;
PPARTITION_INFORMATION PartitionInfo = PartitionBuffer->PartitionEntry;
PPARTITION_INFORMATION TableEntry;
ExtendedOffset.QuadPart = NextOffset.QuadPart = Offset.QuadPart = 0;
PAGED_CODE();
/* Normalize the buffer size */
BufferSize = max(512, SectorSize);
/* Get the partial drive geometry */
xHalGetPartialGeometry(DeviceObject, &ConventionalCylinders, &DiskSize);
/* Check for EZ Drive */
HalExamineMBR(DeviceObject, BufferSize, 0x55, &MbrBuffer);
if (MbrBuffer)
{
/* EZ Drive found, bias the offset */
IsEzDrive = TRUE;
ExFreePoolWithTag(MbrBuffer, TAG_FILE_SYSTEM);
Offset.QuadPart = 512;
}
/* Get the number of bits to shift to multiply by the sector size */
for (k = 0; k < 32; k++) if ((SectorSize >> k) == 1) break;
/* Check if there's only one partition */
if (PartitionBuffer->PartitionCount == 1)
{
/* Check if it has no starting offset or hidden sectors */
if (!(PartitionInfo->StartingOffset.QuadPart) &&
!(PartitionInfo->HiddenSectors))
{
/* Then it's a super floppy */
IsSuperFloppy = TRUE;
/* Which also means it must be non-bootable FAT-16 */
if ((PartitionInfo->PartitionNumber) ||
(PartitionInfo->PartitionType != PARTITION_FAT_16) ||
(PartitionInfo->BootIndicator))
{
/* It's not, so we fail */
return STATUS_INVALID_PARAMETER;
}
/* Check if it needs a rewrite, and disable EZ drive for sure */
if (PartitionInfo->RewritePartition) DoRewrite = TRUE;
IsEzDrive = FALSE;
}
}
/* Count the number of partition tables */
DiskLayout->TableCount = (PartitionBuffer->PartitionCount + 4 - 1) / 4;
/* Allocate our partition buffer */
Buffer = ExAllocatePoolWithTag(NonPagedPool, PAGE_SIZE, TAG_FILE_SYSTEM);
if (!Buffer) return STATUS_INSUFFICIENT_RESOURCES;
/* Loop the entries */
Entry = (PPTE)&Buffer[PARTITION_TABLE_OFFSET];
for (i = 0; i < DiskLayout->TableCount; i++)
{
/* Set if this is the MBR partition */
IsMbr= (BOOLEAN)!i;
/* Initialize th event */
KeInitializeEvent(&Event, NotificationEvent, FALSE);
/* Build the read IRP */
Irp = IoBuildSynchronousFsdRequest(IRP_MJ_READ,
DeviceObject,
Buffer,
BufferSize,
&Offset,
&Event,
&IoStatusBlock);
if (!Irp)
{
/* Fail */
Status = STATUS_INSUFFICIENT_RESOURCES;
break;
}
/* Make sure to disable volume verification */
IoStackLocation = IoGetNextIrpStackLocation(Irp);
IoStackLocation->Flags |= SL_OVERRIDE_VERIFY_VOLUME;
/* Call the driver */
Status = IoCallDriver(DeviceObject, Irp);
if (Status == STATUS_PENDING)
{
/* Wait for completion */
KeWaitForSingleObject(&Event, Executive, KernelMode, FALSE, NULL);
Status = IoStatusBlock.Status;
}
/* Check for failure */
if (!NT_SUCCESS(Status)) break;
/* If we biased for EZ-Drive, unbias now */
if (IsEzDrive && (Offset.QuadPart == 512)) Offset.QuadPart = 0;
/* Check if this is a normal disk */
if (!IsSuperFloppy)
{
/* Set the boot record signature */
Buffer[BOOT_SIGNATURE_OFFSET] = BOOT_RECORD_SIGNATURE;
/* By default, don't require a rewrite */
DoRewrite = FALSE;
/* Check if we don't have an offset */
if (!Offset.QuadPart)
{
/* Check if the signature doesn't match */
if (((PULONG)Buffer)[PARTITION_TABLE_OFFSET / 2 - 1] !=
PartitionBuffer->Signature)
{
/* Then write the signature and now we need a rewrite */
((PULONG)Buffer)[PARTITION_TABLE_OFFSET / 2 - 1] =
PartitionBuffer->Signature;
DoRewrite = TRUE;
}
}
/* Loop the partition table entries */
PartitionTable = &DiskLayout->PartitionTable[i];
for (j = 0; j < 4; j++)
{
/* Get the current entry and type */
TableEntry = &PartitionTable->PartitionEntry[j];
PartitionType = TableEntry->PartitionType;
/* Check if the entry needs a rewrite */
if (TableEntry->RewritePartition)
{
/* Then we need one too */
DoRewrite = TRUE;
/* Save the type and if it's a bootable partition */
Entry[j].PartitionType = TableEntry->PartitionType;
Entry[j].ActiveFlag = TableEntry->BootIndicator ? 0x80 : 0;
/* Make sure it's used */
if (PartitionType != PARTITION_ENTRY_UNUSED)
{
/* Make sure it's not a container (unless primary) */
if ((IsMbr) || !(IsContainerPartition(PartitionType)))
{
/* Use the partition offset */
StartOffset.QuadPart = Offset.QuadPart;
}
else
{
/* Use the extended logical partition offset */
StartOffset.QuadPart = ExtendedOffset.QuadPart;
}
/* Set the sector offset */
SectorOffset.QuadPart = TableEntry->
StartingOffset.QuadPart -
StartOffset.QuadPart;
/* Now calculate the starting sector */
StartOffset.QuadPart = SectorOffset.QuadPart >> k;
Entry[j].StartingSector = StartOffset.LowPart;
/* As well as the length */
PartitionLength.QuadPart = TableEntry->PartitionLength.
QuadPart >> k;
Entry[j].PartitionLength = PartitionLength.LowPart;
/* Calculate the CHS values */
HalpCalculateChsValues(&TableEntry->StartingOffset,
&TableEntry->PartitionLength,
k,
SectorsPerTrack,
NumberOfHeads,
ConventionalCylinders,
(PPARTITION_DESCRIPTOR)
&Entry[j]);
}
else
{
/* Otherwise set up an empty entry */
Entry[j].StartingSector = 0;
Entry[j].PartitionLength = 0;
Entry[j].StartingTrack = 0;
Entry[j].EndingTrack = 0;
Entry[j].StartingCylinder = 0;
Entry[j].EndingCylinder = 0;
}
}
/* Check if this is a container partition */
if (IsContainerPartition(PartitionType))
{
/* Then update the offset to use */
NextOffset = TableEntry->StartingOffset;
}
}
}
/* Check if we need to write back the buffer */
if (DoRewrite)
{
/* We don't need to do this again */
DoRewrite = FALSE;
/* Initialize the event */
KeInitializeEvent(&Event, NotificationEvent, FALSE);
/* If we unbiased for EZ-Drive, rebias now */
if ((IsEzDrive) && !(Offset.QuadPart)) Offset.QuadPart = 512;
/* Build the write IRP */
Irp = IoBuildSynchronousFsdRequest(IRP_MJ_WRITE,
DeviceObject,
Buffer,
BufferSize,
&Offset,
&Event,
&IoStatusBlock);
if (!Irp)
{
/* Fail */
Status = STATUS_INSUFFICIENT_RESOURCES;
break;
}
/* Make sure to disable volume verification */
IoStackLocation = IoGetNextIrpStackLocation(Irp);
IoStackLocation->Flags |= SL_OVERRIDE_VERIFY_VOLUME;
/* Call the driver */
Status = IoCallDriver(DeviceObject, Irp);
if (Status == STATUS_PENDING)
{
/* Wait for completion */
KeWaitForSingleObject(&Event,
Executive,
KernelMode,
FALSE,
NULL);
Status = IoStatusBlock.Status;
}
/* Check for failure */
if (!NT_SUCCESS(Status)) break;
/* If we biased for EZ-Drive, unbias now */
if (IsEzDrive && (Offset.QuadPart == 512)) Offset.QuadPart = 0;
}
/* Update the partition offset and set the extended offset if needed */
Offset = NextOffset;
if (IsMbr) ExtendedOffset = NextOffset;
}
/* If we had a buffer, free it, then return status */
if (Buffer) ExFreePoolWithTag(Buffer, TAG_FILE_SYSTEM);
return Status;
}
/* PUBLIC FUNCTIONS **********************************************************/
/*
* @implemented
*/
VOID
FASTCALL
HalExamineMBR(IN PDEVICE_OBJECT DeviceObject,
IN ULONG SectorSize,
IN ULONG MbrTypeIdentifier,
OUT PVOID *MbrBuffer)
{
HALDISPATCH->HalExamineMBR(DeviceObject,
SectorSize,
MbrTypeIdentifier,
MbrBuffer);
}
/*
* @implemented
*/
NTSTATUS
FASTCALL
IoReadPartitionTable(IN PDEVICE_OBJECT DeviceObject,
IN ULONG SectorSize,
IN BOOLEAN ReturnRecognizedPartitions,
IN OUT PDRIVE_LAYOUT_INFORMATION *PartitionBuffer)
{
return HALDISPATCH->HalIoReadPartitionTable(DeviceObject,
SectorSize,
ReturnRecognizedPartitions,
PartitionBuffer);
}
/*
* @implemented
*/
NTSTATUS
FASTCALL
IoSetPartitionInformation(IN PDEVICE_OBJECT DeviceObject,
IN ULONG SectorSize,
IN ULONG PartitionNumber,
IN ULONG PartitionType)
{
return HALDISPATCH->HalIoSetPartitionInformation(DeviceObject,
SectorSize,
PartitionNumber,
PartitionType);
}
/*
* @implemented
*/
NTSTATUS
FASTCALL
IoWritePartitionTable(IN PDEVICE_OBJECT DeviceObject,
IN ULONG SectorSize,
IN ULONG SectorsPerTrack,
IN ULONG NumberOfHeads,
IN PDRIVE_LAYOUT_INFORMATION PartitionBuffer)
{
return HALDISPATCH->HalIoWritePartitionTable(DeviceObject,
SectorSize,
SectorsPerTrack,
NumberOfHeads,
PartitionBuffer);
}
/*
* @implemented
*/
VOID
FASTCALL
IoAssignDriveLetters(IN PLOADER_PARAMETER_BLOCK LoaderBlock,
IN PSTRING NtDeviceName,
OUT PUCHAR NtSystemPath,
OUT PSTRING NtSystemPathString)
{
HALDISPATCH->HalIoAssignDriveLetters(LoaderBlock,
NtDeviceName,
NtSystemPath,
NtSystemPathString);
}
/* EOF */
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