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reactos/drivers/storage/mountmgr/device.c
Victor Perevertkin f9f5a78715
[MOUNTMGR] Fix bugs in MountMgrQueryDosVolumePath 
- Do not access uninitialized SymlinkInformation on failure case
  and just return
- Do not make an assumption that MOUNTMGR_TARGET_NAME has a zero-string
2020-12-16 01:13:57 +03:00

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/*
* ReactOS kernel
* Copyright (C) 2011-2012 ReactOS Team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS kernel
* FILE: drivers/filesystem/mountmgr/device.c
* PURPOSE: Mount Manager - Device Control
* PROGRAMMER: Pierre Schweitzer (pierre.schweitzer@reactos.org)
*/
#include "mntmgr.h"
#define MAX_DEVICES 0x3E8 /* Matches 1000 devices */
#define NDEBUG
#include <debug.h>
/*
* @implemented
*/
NTSTATUS
MountMgrChangeNotify(IN PDEVICE_EXTENSION DeviceExtension,
IN PIRP Irp)
{
KIRQL OldIrql;
NTSTATUS Status;
PIO_STACK_LOCATION Stack;
PMOUNTMGR_CHANGE_NOTIFY_INFO ChangeNotify;
/* Get the I/O buffer */
Stack = IoGetCurrentIrpStackLocation(Irp);
ChangeNotify = (PMOUNTMGR_CHANGE_NOTIFY_INFO)Irp->AssociatedIrp.SystemBuffer;
/* Validate it */
if (Stack->Parameters.DeviceIoControl.OutputBufferLength < sizeof(MOUNTMGR_CHANGE_NOTIFY_INFO) ||
Stack->Parameters.DeviceIoControl.InputBufferLength < sizeof(MOUNTMGR_CHANGE_NOTIFY_INFO))
{
return STATUS_INVALID_PARAMETER;
}
/* If epic number doesn't match, just return now one */
if (DeviceExtension->EpicNumber != ChangeNotify->EpicNumber)
{
ChangeNotify->EpicNumber = DeviceExtension->EpicNumber;
Irp->IoStatus.Information = sizeof(MOUNTMGR_CHANGE_NOTIFY_INFO);
return STATUS_SUCCESS;
}
/* If IRP is to be canceled, forget about that */
IoAcquireCancelSpinLock(&OldIrql);
if (Irp->Cancel)
{
Status = STATUS_CANCELLED;
}
/* Otherwise queue the IRP to be notified with the next epic number change */
else
{
InsertTailList(&(DeviceExtension->IrpListHead), &(Irp->Tail.Overlay.ListEntry));
IoMarkIrpPending(Irp);
IoSetCancelRoutine(Irp, MountMgrCancel);
Status = STATUS_PENDING;
}
IoReleaseCancelSpinLock(OldIrql);
return Status;
}
/*
* @implemented
*/
NTSTATUS
MountmgrWriteNoAutoMount(IN PDEVICE_EXTENSION DeviceExtension)
{
ULONG Value = DeviceExtension->NoAutoMount;
return RtlWriteRegistryValue(RTL_REGISTRY_ABSOLUTE,
DeviceExtension->RegistryPath.Buffer,
L"NoAutoMount",
REG_DWORD,
&Value,
sizeof(Value));
}
/*
* @implemented
*/
NTSTATUS
MountMgrSetAutoMount(IN PDEVICE_EXTENSION DeviceExtension,
IN PIRP Irp)
{
PIO_STACK_LOCATION Stack;
PMOUNTMGR_SET_AUTO_MOUNT SetState;
Stack = IoGetCurrentIrpStackLocation(Irp);
if (Stack->Parameters.DeviceIoControl.InputBufferLength < sizeof(MOUNTMGR_SET_AUTO_MOUNT))
{
Irp->IoStatus.Information = 0;
return STATUS_INVALID_PARAMETER;
}
/* Only change if there's a real difference */
SetState = (PMOUNTMGR_SET_AUTO_MOUNT)Irp->AssociatedIrp.SystemBuffer;
if (SetState->NewState == !DeviceExtension->NoAutoMount)
{
Irp->IoStatus.Information = 0;
return STATUS_SUCCESS;
}
/* Set new state; ! on purpose */
DeviceExtension->NoAutoMount = !SetState->NewState;
Irp->IoStatus.Information = 0;
return MountmgrWriteNoAutoMount(DeviceExtension);
}
/*
* @implemented
*/
NTSTATUS
MountMgrQueryAutoMount(IN PDEVICE_EXTENSION DeviceExtension,
IN PIRP Irp)
{
PIO_STACK_LOCATION Stack;
PMOUNTMGR_QUERY_AUTO_MOUNT QueryState;
Stack = IoGetCurrentIrpStackLocation(Irp);
if (Stack->Parameters.DeviceIoControl.OutputBufferLength < sizeof(MOUNTMGR_QUERY_AUTO_MOUNT))
{
Irp->IoStatus.Information = 0;
return STATUS_INVALID_PARAMETER;
}
QueryState = (PMOUNTMGR_QUERY_AUTO_MOUNT)Irp->AssociatedIrp.SystemBuffer;
QueryState->CurrentState = !DeviceExtension->NoAutoMount;
Irp->IoStatus.Information = sizeof(MOUNTMGR_QUERY_AUTO_MOUNT);
return STATUS_SUCCESS;
}
/*
* @implemented
*/
NTSTATUS
NTAPI
ScrubRegistryRoutine(IN PWSTR ValueName,
IN ULONG ValueType,
IN PVOID ValueData,
IN ULONG ValueLength,
IN PVOID Context,
IN PVOID EntryContext)
{
NTSTATUS Status;
PLIST_ENTRY NextEntry;
PDEVICE_INFORMATION DeviceInfo;
PBOOLEAN Continue = EntryContext;
PDEVICE_EXTENSION DeviceExtension = Context;
if (ValueType != REG_BINARY)
{
return STATUS_SUCCESS;
}
/* Delete values for devices that don't have the matching unique ID */
if (!IsListEmpty(&(DeviceExtension->DeviceListHead)))
{
for (NextEntry = DeviceExtension->DeviceListHead.Flink;
NextEntry != &(DeviceExtension->DeviceListHead);
NextEntry = NextEntry->Flink)
{
DeviceInfo = CONTAINING_RECORD(NextEntry,
DEVICE_INFORMATION,
DeviceListEntry);
if (!DeviceInfo->UniqueId || DeviceInfo->UniqueId->UniqueIdLength != ValueLength)
{
continue;
}
if (RtlCompareMemory(DeviceInfo->UniqueId->UniqueId, ValueData, ValueLength) == ValueLength)
{
return STATUS_SUCCESS;
}
}
}
/* Wrong unique ID, scrub it */
Status = RtlDeleteRegistryValue(RTL_REGISTRY_ABSOLUTE,
DatabasePath,
ValueName);
if (!NT_SUCCESS(Status))
{
*Continue = TRUE;
return STATUS_UNSUCCESSFUL;
}
*Continue = FALSE;
return Status;
}
/*
* @implemented
*/
NTSTATUS
MountMgrScrubRegistry(IN PDEVICE_EXTENSION DeviceExtension)
{
NTSTATUS Status;
BOOLEAN Continue;
RTL_QUERY_REGISTRY_TABLE QueryTable[2];
do
{
RtlZeroMemory(QueryTable, sizeof(QueryTable));
QueryTable[0].QueryRoutine = ScrubRegistryRoutine;
QueryTable[0].EntryContext = &Continue;
Continue = FALSE;
Status = RtlQueryRegistryValues(RTL_REGISTRY_ABSOLUTE,
DatabasePath,
QueryTable,
DeviceExtension,
NULL);
}
while (Continue);
return Status;
}
/*
* @implemented
*/
NTSTATUS
MountMgrCreatePoint(IN PDEVICE_EXTENSION DeviceExtension,
IN PIRP Irp)
{
ULONG MaxLength;
PIO_STACK_LOCATION Stack;
PMOUNTMGR_CREATE_POINT_INPUT Point;
UNICODE_STRING DeviceName, SymbolicName;
Stack = IoGetCurrentIrpStackLocation(Irp);
if (Stack->Parameters.DeviceIoControl.InputBufferLength < sizeof(MOUNTMGR_CREATE_POINT_INPUT))
{
return STATUS_INVALID_PARAMETER;
}
Point = (PMOUNTMGR_CREATE_POINT_INPUT)Irp->AssociatedIrp.SystemBuffer;
MaxLength = MAX((Point->DeviceNameOffset + Point->DeviceNameLength),
(Point->SymbolicLinkNameLength + Point->SymbolicLinkNameOffset));
if (MaxLength > Stack->Parameters.DeviceIoControl.InputBufferLength)
{
return STATUS_INVALID_PARAMETER;
}
/* Get all the strings and call the worker */
SymbolicName.Length = Point->SymbolicLinkNameLength;
SymbolicName.MaximumLength = Point->SymbolicLinkNameLength;
DeviceName.Length = Point->DeviceNameLength;
DeviceName.MaximumLength = Point->DeviceNameLength;
SymbolicName.Buffer = (PVOID)((ULONG_PTR)Point + Point->SymbolicLinkNameOffset);
DeviceName.Buffer = (PVOID)((ULONG_PTR)Point + Point->DeviceNameOffset);
return MountMgrCreatePointWorker(DeviceExtension, &SymbolicName, &DeviceName);
}
/*
* @implemented
*/
NTSTATUS
MountMgrCheckUnprocessedVolumes(IN PDEVICE_EXTENSION DeviceExtension,
IN PIRP Irp)
{
PLIST_ENTRY NextEntry;
PDEVICE_INFORMATION DeviceInformation;
NTSTATUS ArrivalStatus, Status = STATUS_SUCCESS;
UNREFERENCED_PARAMETER(Irp);
/* No offline volumes, nothing more to do */
if (IsListEmpty(&(DeviceExtension->OfflineDeviceListHead)))
{
KeReleaseSemaphore(&(DeviceExtension->DeviceLock), IO_NO_INCREMENT, 1, FALSE);
return STATUS_SUCCESS;
}
KeReleaseSemaphore(&(DeviceExtension->DeviceLock), IO_NO_INCREMENT, 1, FALSE);
/* Reactivate all the offline volumes */
while (!IsListEmpty(&(DeviceExtension->OfflineDeviceListHead)))
{
NextEntry = RemoveHeadList(&(DeviceExtension->OfflineDeviceListHead));
DeviceInformation = CONTAINING_RECORD(NextEntry, DEVICE_INFORMATION, DeviceListEntry);
ArrivalStatus = MountMgrMountedDeviceArrival(DeviceExtension,
&(DeviceInformation->SymbolicName),
DeviceInformation->ManuallyRegistered);
/* Then, remove them dead information */
MountMgrFreeDeadDeviceInfo(DeviceInformation);
if (NT_SUCCESS(Status))
{
Status = ArrivalStatus;
}
}
return Status;
}
/*
* @implemented
*/
BOOLEAN
IsFtVolume(IN PUNICODE_STRING SymbolicName)
{
PIRP Irp;
KEVENT Event;
NTSTATUS Status;
PFILE_OBJECT FileObject;
IO_STATUS_BLOCK IoStatusBlock;
PARTITION_INFORMATION PartitionInfo;
PDEVICE_OBJECT DeviceObject, FileDeviceObject;
/* Get device object */
Status = IoGetDeviceObjectPointer(SymbolicName,
FILE_READ_ATTRIBUTES,
&FileObject,
&DeviceObject);
if (!NT_SUCCESS(Status))
{
return FALSE;
}
/* Get attached device */
FileDeviceObject = FileObject->DeviceObject;
DeviceObject = IoGetAttachedDeviceReference(FileDeviceObject);
/* FT volume can't be removable */
if (FileDeviceObject->Characteristics & FILE_REMOVABLE_MEDIA)
{
ObDereferenceObject(DeviceObject);
ObDereferenceObject(FileObject);
return FALSE;
}
ObDereferenceObject(FileObject);
/* Get partition information */
KeInitializeEvent(&Event, NotificationEvent, FALSE);
Irp = IoBuildDeviceIoControlRequest(IOCTL_DISK_GET_PARTITION_INFO,
DeviceObject,
NULL,
0,
&PartitionInfo,
sizeof(PartitionInfo),
FALSE,
&Event,
&IoStatusBlock);
if (!Irp)
{
ObDereferenceObject(DeviceObject);
return FALSE;
}
Status = IoCallDriver(DeviceObject, Irp);
if (Status == STATUS_PENDING)
{
KeWaitForSingleObject(&Event, Executive, KernelMode, FALSE, NULL);
Status = IoStatusBlock.Status;
}
ObDereferenceObject(DeviceObject);
if (!NT_SUCCESS(Status))
{
return FALSE;
}
/* Check if this is a FT volume */
return IsFTPartition(PartitionInfo.PartitionType);
}
/*
* @implemented
*/
VOID
ProcessSuggestedDriveLetters(IN PDEVICE_EXTENSION DeviceExtension)
{
WCHAR NameBuffer[DRIVE_LETTER_LENGTH / sizeof(WCHAR)];
PLIST_ENTRY NextEntry;
UNICODE_STRING SymbolicName;
PDEVICE_INFORMATION DeviceInformation;
/* No devices? Nothing to do! */
if (IsListEmpty(&(DeviceExtension->DeviceListHead)))
{
return;
}
/* For all the devices */
for (NextEntry = DeviceExtension->DeviceListHead.Flink;
NextEntry != &(DeviceExtension->DeviceListHead);
NextEntry = NextEntry->Flink)
{
DeviceInformation = CONTAINING_RECORD(NextEntry, DEVICE_INFORMATION, DeviceListEntry);
/* If no drive letter */
if (DeviceInformation->SuggestedDriveLetter == (UCHAR)-1)
{
/* Ensure it has no entry yet */
if (!HasDriveLetter(DeviceInformation) &&
!HasNoDriveLetterEntry(DeviceInformation->UniqueId))
{
/* And create one */
CreateNoDriveLetterEntry(DeviceInformation->UniqueId);
}
DeviceInformation->SuggestedDriveLetter = 0;
}
/* Suggested letter & no entry */
else if (DeviceInformation->SuggestedDriveLetter &&
!HasNoDriveLetterEntry(DeviceInformation->UniqueId))
{
/* Just create a mount point */
SymbolicName.Buffer = NameBuffer;
RtlCopyMemory(NameBuffer, DosDevices.Buffer, DosDevices.Length);
NameBuffer[LETTER_POSITION] = DeviceInformation->SuggestedDriveLetter;
NameBuffer[COLON_POSITION] = L':';
SymbolicName.Length =
SymbolicName.MaximumLength = DRIVE_LETTER_LENGTH;
MountMgrCreatePointWorker(DeviceExtension, &SymbolicName, &(DeviceInformation->DeviceName));
}
}
}
/*
* @implemented
*/
NTSTATUS
MountMgrNextDriveLetterWorker(IN PDEVICE_EXTENSION DeviceExtension,
IN PUNICODE_STRING DeviceName,
OUT PMOUNTMGR_DRIVE_LETTER_INFORMATION DriveLetterInfo)
{
NTSTATUS Status;
UCHAR DriveLetter;
PLIST_ENTRY NextEntry;
PMOUNTDEV_UNIQUE_ID UniqueId;
BOOLEAN Removable, GptDriveLetter;
PDEVICE_INFORMATION DeviceInformation;
WCHAR NameBuffer[DRIVE_LETTER_LENGTH];
PSYMLINK_INFORMATION SymlinkInformation;
UNICODE_STRING TargetDeviceName, SymbolicName;
/* First, process suggested letters */
if (!DeviceExtension->ProcessedSuggestions)
{
ProcessSuggestedDriveLetters(DeviceExtension);
DeviceExtension->ProcessedSuggestions = TRUE;
}
/* Then, get information about the device */
Status = QueryDeviceInformation(DeviceName, &TargetDeviceName, NULL, &Removable, &GptDriveLetter, NULL, NULL, NULL);
if (!NT_SUCCESS(Status))
{
return Status;
}
/* Ensure we have such device */
NextEntry = DeviceExtension->DeviceListHead.Flink;
while (NextEntry != &(DeviceExtension->DeviceListHead))
{
DeviceInformation = CONTAINING_RECORD(NextEntry, DEVICE_INFORMATION, DeviceListEntry);
if (RtlCompareUnicodeString(&(DeviceInformation->DeviceName), &TargetDeviceName, TRUE) == 0)
{
break;
}
NextEntry = NextEntry->Flink;
}
if (NextEntry == &(DeviceExtension->DeviceListHead))
{
FreePool(TargetDeviceName.Buffer);
return STATUS_OBJECT_NAME_NOT_FOUND;
}
/* Now, mark we have assigned a letter (assumption) */
DeviceInformation->LetterAssigned =
DriveLetterInfo->DriveLetterWasAssigned = TRUE;
/* Browse all the symlinks to check if there is already a drive letter */
NextEntry = DeviceInformation->SymbolicLinksListHead.Flink;
while (NextEntry != &(DeviceInformation->SymbolicLinksListHead))
{
SymlinkInformation = CONTAINING_RECORD(NextEntry, SYMLINK_INFORMATION, SymbolicLinksListEntry);
/* If this is a drive letter and it is online, forget about new drive letter */
if (IsDriveLetter(&(SymlinkInformation->Name)) && SymlinkInformation->Online)
{
DriveLetterInfo->DriveLetterWasAssigned = FALSE;
DriveLetterInfo->CurrentDriveLetter = (CHAR)SymlinkInformation->Name.Buffer[LETTER_POSITION];
break;
}
NextEntry = NextEntry->Flink;
}
/* If we didn't find a drive letter online
* ensure this is not a no drive entry
* by querying GPT attributes & database
*/
if (NextEntry == &(DeviceInformation->SymbolicLinksListHead))
{
if (!GptDriveLetter || HasNoDriveLetterEntry(DeviceInformation->UniqueId))
{
DriveLetterInfo->DriveLetterWasAssigned = FALSE;
DriveLetterInfo->CurrentDriveLetter = 0;
goto Release;
}
}
/* No, ensure that the device is not automounted nor removable */
if (!DeviceExtension->NoAutoMount && !Removable)
{
if (DriveLetterInfo->DriveLetterWasAssigned)
{
DriveLetterInfo->DriveLetterWasAssigned = FALSE;
DriveLetterInfo->CurrentDriveLetter = 0;
goto Release;
}
}
if (!DriveLetterInfo->DriveLetterWasAssigned)
{
goto Release;
}
/* Now everything is fine, start processing */
if (RtlPrefixUnicodeString(&DeviceFloppy, &TargetDeviceName, TRUE))
{
/* If the device is a floppy, start with letter A */
DriveLetter = 'A';
}
else if (RtlPrefixUnicodeString(&DeviceCdRom, &TargetDeviceName, TRUE))
{
/* If the device is a CD-ROM, start with letter D */
DriveLetter = 'D';
}
else
{
/* Finally, if it's a disk, use C */
DriveLetter = 'C';
}
/* We cannot set NO drive letter */
ASSERT(DeviceInformation->SuggestedDriveLetter != (UCHAR)-1);
/* If we don't have suggested letter but it's a FT volume, fail */
if (!DeviceInformation->SuggestedDriveLetter && IsFtVolume(&(DeviceInformation->DeviceName)))
{
DriveLetterInfo->DriveLetterWasAssigned = FALSE;
DriveLetterInfo->CurrentDriveLetter = 0;
goto Release;
}
/* Prepare buffer */
RtlCopyMemory(NameBuffer, DosDevices.Buffer, DosDevices.Length);
NameBuffer[COLON_POSITION] = L':';
SymbolicName.Buffer = NameBuffer;
SymbolicName.Length =
SymbolicName.MaximumLength = DRIVE_LETTER_LENGTH;
/* It's all prepared, create mount point */
if (DeviceInformation->SuggestedDriveLetter)
{
DriveLetterInfo->CurrentDriveLetter = DeviceInformation->SuggestedDriveLetter;
NameBuffer[LETTER_POSITION] = DeviceInformation->SuggestedDriveLetter;
Status = MountMgrCreatePointWorker(DeviceExtension, &SymbolicName, &TargetDeviceName);
if (NT_SUCCESS(Status))
{
goto Release;
}
}
/* It failed with this letter... Try another one! */
for (DriveLetterInfo->CurrentDriveLetter = DriveLetter;
DriveLetterInfo->CurrentDriveLetter <= L'Z';
DriveLetterInfo->CurrentDriveLetter++)
{
NameBuffer[LETTER_POSITION] = DriveLetterInfo->CurrentDriveLetter;
Status = MountMgrCreatePointWorker(DeviceExtension, &SymbolicName, &TargetDeviceName);
if (NT_SUCCESS(Status))
{
break;
}
}
/* We failed setting a letter */
if (DriveLetterInfo->CurrentDriveLetter > L'Z')
{
DriveLetterInfo->DriveLetterWasAssigned = FALSE;
DriveLetterInfo->CurrentDriveLetter = 0;
/* Try at least to add a no drive letter entry */
Status = QueryDeviceInformation(&TargetDeviceName, NULL, &UniqueId, NULL, NULL, NULL, NULL, NULL);
if (NT_SUCCESS(Status))
{
CreateNoDriveLetterEntry(UniqueId);
FreePool(UniqueId);
}
}
Release:
FreePool(TargetDeviceName.Buffer);
return STATUS_SUCCESS;
}
/*
* @implemented
*/
NTSTATUS
MountMgrNextDriveLetter(IN PDEVICE_EXTENSION DeviceExtension,
IN PIRP Irp)
{
NTSTATUS Status;
PIO_STACK_LOCATION Stack;
UNICODE_STRING DeviceName;
PMOUNTMGR_DRIVE_LETTER_TARGET DriveLetterTarget;
MOUNTMGR_DRIVE_LETTER_INFORMATION DriveLetterInformation;
Stack = IoGetCurrentIrpStackLocation(Irp);
/* Validate input */
if (Stack->Parameters.DeviceIoControl.InputBufferLength < sizeof(MOUNTMGR_DRIVE_LETTER_TARGET) ||
Stack->Parameters.DeviceIoControl.OutputBufferLength < sizeof(MOUNTMGR_DRIVE_LETTER_INFORMATION))
{
return STATUS_INVALID_PARAMETER;
}
DriveLetterTarget = (PMOUNTMGR_DRIVE_LETTER_TARGET)Irp->AssociatedIrp.SystemBuffer;
if (DriveLetterTarget->DeviceNameLength + sizeof(USHORT) > Stack->Parameters.DeviceIoControl.InputBufferLength)
{
return STATUS_INVALID_PARAMETER;
}
/* Call the worker */
DeviceName.Buffer = DriveLetterTarget->DeviceName;
DeviceName.Length =
DeviceName.MaximumLength = DriveLetterTarget->DeviceNameLength;
Status = MountMgrNextDriveLetterWorker(DeviceExtension, &DeviceName,
&DriveLetterInformation);
if (NT_SUCCESS(Status))
{
*(PMOUNTMGR_DRIVE_LETTER_INFORMATION)Irp->AssociatedIrp.SystemBuffer =
DriveLetterInformation;
Irp->IoStatus.Information = sizeof(MOUNTMGR_DRIVE_LETTER_INFORMATION);
}
return Status;
}
/*
* @implemented
*/
NTSTATUS
NTAPI
MountMgrQuerySystemVolumeNameQueryRoutine(IN PWSTR ValueName,
IN ULONG ValueType,
IN PVOID ValueData,
IN ULONG ValueLength,
IN PVOID Context,
IN PVOID EntryContext)
{
UNICODE_STRING ValueString;
PUNICODE_STRING SystemVolumeName;
UNREFERENCED_PARAMETER(ValueName);
UNREFERENCED_PARAMETER(ValueLength);
UNREFERENCED_PARAMETER(EntryContext);
if (ValueType != REG_SZ)
{
return STATUS_SUCCESS;
}
RtlInitUnicodeString(&ValueString, ValueData);
SystemVolumeName = Context;
/* Return a string containing system volume name */
SystemVolumeName->Length = ValueString.Length;
SystemVolumeName->MaximumLength = ValueString.Length + sizeof(WCHAR);
SystemVolumeName->Buffer = AllocatePool(SystemVolumeName->MaximumLength);
if (SystemVolumeName->Buffer)
{
RtlCopyMemory(SystemVolumeName->Buffer, ValueData, ValueString.Length);
SystemVolumeName->Buffer[ValueString.Length / sizeof(WCHAR)] = UNICODE_NULL;
}
return STATUS_SUCCESS;
}
/*
* @implemented
*/
NTSTATUS
MountMgrQuerySystemVolumeName(OUT PUNICODE_STRING SystemVolumeName)
{
RTL_QUERY_REGISTRY_TABLE QueryTable[2];
RtlZeroMemory(QueryTable, sizeof(QueryTable));
QueryTable[0].QueryRoutine = MountMgrQuerySystemVolumeNameQueryRoutine;
QueryTable[0].Flags = RTL_QUERY_REGISTRY_REQUIRED;
QueryTable[0].Name = L"SystemPartition";
SystemVolumeName->Buffer = NULL;
RtlQueryRegistryValues(RTL_REGISTRY_ABSOLUTE,
L"\\Registry\\Machine\\System\\Setup",
QueryTable,
SystemVolumeName,
NULL);
if (SystemVolumeName->Buffer)
{
return STATUS_SUCCESS;
}
return STATUS_UNSUCCESSFUL;
}
/*
* @implemented
*/
VOID
MountMgrAssignDriveLetters(IN PDEVICE_EXTENSION DeviceExtension)
{
NTSTATUS Status;
PLIST_ENTRY NextEntry;
UNICODE_STRING SystemVolumeName;
PDEVICE_INFORMATION DeviceInformation;
MOUNTMGR_DRIVE_LETTER_INFORMATION DriveLetterInformation;
/* First, get system volume name */
Status = MountMgrQuerySystemVolumeName(&SystemVolumeName);
/* If there are no device, it's all done */
if (IsListEmpty(&(DeviceExtension->DeviceListHead)))
{
if (NT_SUCCESS(Status))
{
FreePool(SystemVolumeName.Buffer);
}
return;
}
/* Now, for all the devices... */
for (NextEntry = DeviceExtension->DeviceListHead.Flink;
NextEntry != &(DeviceExtension->DeviceListHead);
NextEntry = NextEntry->Flink)
{
DeviceInformation = CONTAINING_RECORD(NextEntry, DEVICE_INFORMATION, DeviceListEntry);
/* If the device doesn't have a letter assigned, do it! */
if (!DeviceInformation->LetterAssigned)
{
MountMgrNextDriveLetterWorker(DeviceExtension,
&(DeviceInformation->DeviceName),
&DriveLetterInformation);
}
/* If it was the system volume */
if (NT_SUCCESS(Status) && RtlEqualUnicodeString(&SystemVolumeName, &(DeviceInformation->DeviceName), TRUE))
{
/* Keep track of it */
DeviceExtension->DriveLetterData = AllocatePool(DeviceInformation->UniqueId->UniqueIdLength +
sizeof(MOUNTDEV_UNIQUE_ID));
if (DeviceExtension->DriveLetterData)
{
RtlCopyMemory(DeviceExtension->DriveLetterData,
DeviceInformation->UniqueId,
DeviceInformation->UniqueId->UniqueIdLength + sizeof(MOUNTDEV_UNIQUE_ID));
}
/* If it was not automount, ensure it gets mounted */
if (!DeviceExtension->NoAutoMount)
{
DeviceExtension->NoAutoMount = TRUE;
MountMgrNextDriveLetterWorker(DeviceExtension,
&(DeviceInformation->DeviceName),
&DriveLetterInformation);
DeviceExtension->NoAutoMount = FALSE;
}
}
}
if (NT_SUCCESS(Status))
{
FreePool(SystemVolumeName.Buffer);
}
}
/*
* @implemented
*/
NTSTATUS
MountMgrQueryDosVolumePath(IN PDEVICE_EXTENSION DeviceExtension,
IN PIRP Irp)
{
NTSTATUS Status;
ULONG DevicesFound;
PIO_STACK_LOCATION Stack;
PLIST_ENTRY SymlinksEntry;
UNICODE_STRING SymbolicName;
PMOUNTMGR_TARGET_NAME Target;
PWSTR DeviceString, OldBuffer;
USHORT DeviceLength, OldLength;
PDEVICE_INFORMATION DeviceInformation;
PSYMLINK_INFORMATION SymlinkInformation;
PASSOCIATED_DEVICE_ENTRY AssociatedDevice;
Stack = IoGetCurrentIrpStackLocation(Irp);
/* Validate input size */
if (Stack->Parameters.DeviceIoControl.InputBufferLength < sizeof(MOUNTMGR_TARGET_NAME))
{
return STATUS_INVALID_PARAMETER;
}
/* Ensure we have received UNICODE_STRING */
Target = (PMOUNTMGR_TARGET_NAME)Irp->AssociatedIrp.SystemBuffer;
if (Target->DeviceNameLength & 1)
{
return STATUS_INVALID_PARAMETER;
}
/* Validate the entry structure size */
if ((FIELD_OFFSET(MOUNTMGR_TARGET_NAME, DeviceNameLength) + Target->DeviceNameLength) >
Stack->Parameters.DeviceIoControl.InputBufferLength)
{
return STATUS_INVALID_PARAMETER;
}
/* Ensure we can at least return needed size */
if (Stack->Parameters.DeviceIoControl.OutputBufferLength < sizeof(ULONG))
{
return STATUS_INVALID_PARAMETER;
}
/* Construct string for query */
SymbolicName.Length = Target->DeviceNameLength;
SymbolicName.MaximumLength = Target->DeviceNameLength;
SymbolicName.Buffer = Target->DeviceName;
/* Find device with our info */
Status = FindDeviceInfo(DeviceExtension, &SymbolicName, FALSE, &DeviceInformation);
if (!NT_SUCCESS(Status))
{
return Status;
}
DeviceLength = 0;
DeviceString = NULL;
DevicesFound = 0;
/* Try to find associated device info */
while (TRUE)
{
for (SymlinksEntry = DeviceInformation->SymbolicLinksListHead.Flink;
SymlinksEntry != &(DeviceInformation->SymbolicLinksListHead);
SymlinksEntry = SymlinksEntry->Flink)
{
SymlinkInformation = CONTAINING_RECORD(SymlinksEntry, SYMLINK_INFORMATION, SymbolicLinksListEntry);
/* Try to find with drive letter */
if (MOUNTMGR_IS_DRIVE_LETTER(&SymlinkInformation->Name) && SymlinkInformation->Online)
{
break;
}
}
/* We didn't find, break */
if (SymlinksEntry == &(DeviceInformation->SymbolicLinksListHead))
{
return STATUS_NOT_FOUND;
}
/* It doesn't have associated device, go to fallback method */
if (IsListEmpty(&DeviceInformation->AssociatedDevicesHead))
{
goto TryWithVolumeName;
}
/* Create a string with the information about the device */
AssociatedDevice = CONTAINING_RECORD(&(DeviceInformation->SymbolicLinksListHead), ASSOCIATED_DEVICE_ENTRY, AssociatedDevicesEntry);
OldLength = DeviceLength;
OldBuffer = DeviceString;
DeviceLength += AssociatedDevice->String.Length;
DeviceString = AllocatePool(DeviceLength);
if (!DeviceString)
{
if (OldBuffer)
{
FreePool(OldBuffer);
}
return STATUS_INSUFFICIENT_RESOURCES;
}
/* Store our info and previous if any */
RtlCopyMemory(DeviceString, AssociatedDevice->String.Buffer, AssociatedDevice->String.Length);
if (OldBuffer)
{
RtlCopyMemory(&DeviceString[AssociatedDevice->String.Length / sizeof(WCHAR)], OldBuffer, OldLength);
FreePool(OldBuffer);
}
/* Count and continue looking */
++DevicesFound;
DeviceInformation = AssociatedDevice->DeviceInformation;
/* If too many devices, try another way */
if (DevicesFound > MAX_DEVICES) /* 1000 */
{
goto TryWithVolumeName;
}
}
/* Reallocate our string, so that we can prepend disk letter */
OldBuffer = DeviceString;
OldLength = DeviceLength;
DeviceLength += 2 * sizeof(WCHAR);
DeviceString = AllocatePool(DeviceLength);
if (!DeviceString)
{
if (OldBuffer)
{
FreePool(OldBuffer);
}
return STATUS_INSUFFICIENT_RESOURCES;
}
/* Get the letter */
DeviceString[0] = SymlinkInformation->Name.Buffer[LETTER_POSITION];
DeviceString[1] = L':';
/* And copy the rest */
if (OldBuffer)
{
RtlCopyMemory(&DeviceString[2], OldBuffer, OldLength);
FreePool(OldBuffer);
}
TryWithVolumeName:
/* If we didn't find anything, try differently */
if (DeviceLength < 2 * sizeof(WCHAR) || DeviceString[1] != L':')
{
if (DeviceString)
{
FreePool(DeviceString);
DeviceLength = 0;
}
/* Try to find a volume name matching */
for (SymlinksEntry = DeviceInformation->SymbolicLinksListHead.Flink;
SymlinksEntry != &(DeviceInformation->SymbolicLinksListHead);
SymlinksEntry = SymlinksEntry->Flink)
{
SymlinkInformation = CONTAINING_RECORD(SymlinksEntry, SYMLINK_INFORMATION, SymbolicLinksListEntry);
if (MOUNTMGR_IS_VOLUME_NAME(&SymlinkInformation->Name))
{
break;
}
}
/* If found copy */
if (SymlinksEntry != &(DeviceInformation->SymbolicLinksListHead))
{
DeviceLength = SymlinkInformation->Name.Length;
DeviceString = AllocatePool(DeviceLength);
if (!DeviceString)
{
return STATUS_INSUFFICIENT_RESOURCES;
}
RtlCopyMemory(DeviceString, SymlinkInformation->Name.Buffer, DeviceLength);
/* Ensure we are in the right namespace; [1] can be ? */
DeviceString[1] = L'\\';
}
}
/* If we found something */
if (DeviceString)
{
/* At least, we will return our length */
((PMOUNTMGR_VOLUME_PATHS)Irp->AssociatedIrp.SystemBuffer)->MultiSzLength = DeviceLength;
/* MOUNTMGR_VOLUME_PATHS is a string + a ULONG */
Irp->IoStatus.Information = DeviceLength + sizeof(ULONG);
/* If we have enough room for copying the string */
if (sizeof(ULONG) + DeviceLength <= Stack->Parameters.DeviceIoControl.OutputBufferLength)
{
/* Copy it */
if (DeviceLength)
{
RtlCopyMemory(((PMOUNTMGR_VOLUME_PATHS)Irp->AssociatedIrp.SystemBuffer)->MultiSz, DeviceString, DeviceLength);
}
/* And double zero at its end - this is needed in case of multiple paths which are separated by a single 0 */
FreePool(DeviceString);
((PMOUNTMGR_VOLUME_PATHS)Irp->AssociatedIrp.SystemBuffer)->MultiSz[DeviceLength / sizeof(WCHAR)] = 0;
((PMOUNTMGR_VOLUME_PATHS)Irp->AssociatedIrp.SystemBuffer)->MultiSz[DeviceLength / sizeof(WCHAR) + 1] = 0;
return STATUS_SUCCESS;
}
else
{
/* Just return appropriate size and leave */
FreePool(DeviceString);
Irp->IoStatus.Information = sizeof(ULONG);
return STATUS_BUFFER_OVERFLOW;
}
}
/* Fail */
return STATUS_NOT_FOUND;
}
/*
* @implemented
*/
NTSTATUS
MountMgrValidateBackPointer(IN PASSOCIATED_DEVICE_ENTRY AssociatedDeviceEntry,
IN PDEVICE_INFORMATION DeviceInformation,
OUT PBOOLEAN Invalid)
{
HANDLE Handle;
NTSTATUS Status;
PLIST_ENTRY SymlinksEntry;
IO_STATUS_BLOCK IoStatusBlock;
PREPARSE_DATA_BUFFER ReparseData;
OBJECT_ATTRIBUTES ObjectAttributes;
UNICODE_STRING FullName, SubstituteName;
PSYMLINK_INFORMATION SymlinkInformation;
/* Initialize & allocate a string big enough to contain our complete mount point name */
FullName.Length = 0;
FullName.MaximumLength = AssociatedDeviceEntry->String.Length
+ AssociatedDeviceEntry->DeviceInformation->DeviceName.Length
+ sizeof(WCHAR)
+ sizeof(UNICODE_NULL);
FullName.Buffer = AllocatePool(FullName.MaximumLength);
if (!FullName.Buffer)
{
return STATUS_INSUFFICIENT_RESOURCES;
}
/* Create the path */
RtlAppendUnicodeStringToString(&FullName, &AssociatedDeviceEntry->DeviceInformation->DeviceName);
FullName.Buffer[FullName.Length / sizeof(WCHAR)] = L'\\';
RtlAppendUnicodeStringToString(&FullName, &AssociatedDeviceEntry->String);
FullName.Buffer[FullName.Length / sizeof(WCHAR)] = UNICODE_NULL;
/* Open it to query the reparse point */
InitializeObjectAttributes(&ObjectAttributes,
&FullName,
OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE,
NULL,
NULL);
Status = ZwOpenFile(&Handle,
SYNCHRONIZE | FILE_READ_ATTRIBUTES,
&ObjectAttributes, &IoStatusBlock,
FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
FILE_SYNCHRONOUS_IO_NONALERT | FILE_OPEN_REPARSE_POINT);
FreePool(FullName.Buffer);
if (!NT_SUCCESS(Status))
{
*Invalid = TRUE;
return STATUS_SUCCESS;
}
/* Allocate a buffer big enough to read reparse data */
ReparseData = AllocatePool(MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
if (ReparseData == NULL)
{
ZwClose(Handle);
return STATUS_INSUFFICIENT_RESOURCES;
}
/* Query reparse data */
Status = ZwFsControlFile(Handle,
NULL, NULL, NULL,
&IoStatusBlock,
FSCTL_GET_REPARSE_POINT,
NULL, 0,
ReparseData, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
ZwClose(Handle);
if (!NT_SUCCESS(Status))
{
FreePool(ReparseData);
*Invalid = TRUE;
return STATUS_SUCCESS;
}
/* Create a string with the substitute name */
SubstituteName.Length = ReparseData->SymbolicLinkReparseBuffer.SubstituteNameLength;
SubstituteName.MaximumLength = SubstituteName.Length;
SubstituteName.Buffer = (PWSTR)((ULONG_PTR)ReparseData->SymbolicLinkReparseBuffer.PathBuffer + ReparseData->SymbolicLinkReparseBuffer.SubstituteNameOffset);
/* If that's a volume name that matches our associated device, that's a success! */
if (MOUNTMGR_IS_VOLUME_NAME(&SubstituteName))
{
if (SubstituteName.Length == 98 && SubstituteName.Buffer[1] == L'?')
{
for (SymlinksEntry = DeviceInformation->SymbolicLinksListHead.Flink;
SymlinksEntry != &(DeviceInformation->SymbolicLinksListHead);
SymlinksEntry = SymlinksEntry->Flink)
{
SymlinkInformation = CONTAINING_RECORD(SymlinksEntry, SYMLINK_INFORMATION, SymbolicLinksListEntry);
if (RtlEqualUnicodeString(&SubstituteName, &SymlinkInformation->Name, TRUE))
{
FreePool(ReparseData);
return STATUS_SUCCESS;
}
}
}
}
FreePool(ReparseData);
*Invalid = TRUE;
return STATUS_SUCCESS;
}
/*
* @implemented
*/
NTSTATUS
MountMgrQueryVolumePaths(IN PDEVICE_EXTENSION DeviceExtension,
IN PDEVICE_INFORMATION DeviceInformation,
IN PLIST_ENTRY DeviceInfoList,
OUT PMOUNTMGR_VOLUME_PATHS * VolumePaths,
OUT PDEVICE_INFORMATION *FailedDevice)
{
ULONG Written;
NTSTATUS Status;
PLIST_ENTRY Entry;
PSYMLINK_INFORMATION SymlinkInformation;
PDEVICE_INFORMATION_ENTRY DeviceInfoEntry;
PASSOCIATED_DEVICE_ENTRY AssociatedDeviceEntry;
PMOUNTMGR_VOLUME_PATHS * Paths = NULL, * CurrentPath;
ULONG OutputPathLength, NumberOfPaths, ReturnedPaths;
/* We return at least null char */
OutputPathLength = sizeof(UNICODE_NULL);
for (Entry = DeviceInformation->SymbolicLinksListHead.Flink;
Entry != &(DeviceInformation->SymbolicLinksListHead);
Entry = Entry->Flink)
{
SymlinkInformation = CONTAINING_RECORD(Entry, SYMLINK_INFORMATION, SymbolicLinksListEntry);
/* Try to find the drive letter (ie, DOS device) */
if (MOUNTMGR_IS_DRIVE_LETTER(&SymlinkInformation->Name) && SymlinkInformation->Online)
{
/* We'll return the letter */
OutputPathLength = 4 * sizeof(WCHAR);
break;
}
}
/* We didn't find any */
if (Entry == &(DeviceInformation->SymbolicLinksListHead))
{
SymlinkInformation = NULL;
}
/* Do we have any device info to return? */
for (Entry = DeviceInfoList->Flink; Entry != DeviceInfoList; Entry = Entry->Flink)
{
DeviceInfoEntry = CONTAINING_RECORD(Entry, DEVICE_INFORMATION_ENTRY, DeviceInformationEntry);
/* Matching current device */
if (DeviceInfoEntry->DeviceInformation == DeviceInformation)
{
/* Allocate the output buffer */
*VolumePaths = AllocatePool(sizeof(ULONG) + OutputPathLength);
if (*VolumePaths == NULL)
{
return STATUS_INSUFFICIENT_RESOURCES;
}
/* Set size */
(*VolumePaths)->MultiSzLength = OutputPathLength;
/* If we have a drive letter, return it */
if (SymlinkInformation != NULL)
{
(*VolumePaths)->MultiSz[0] = SymlinkInformation->Name.Buffer[LETTER_POSITION];
(*VolumePaths)->MultiSz[1] = L':';
(*VolumePaths)->MultiSz[2] = UNICODE_NULL;
(*VolumePaths)->MultiSz[3] = UNICODE_NULL;
}
else
{
(*VolumePaths)->MultiSz[0] = UNICODE_NULL;
}
return STATUS_SUCCESS;
}
}
/* Allocate a new device entry */
DeviceInfoEntry = AllocatePool(sizeof(DEVICE_INFORMATION_ENTRY));
if (DeviceInfoEntry == NULL)
{
return STATUS_INSUFFICIENT_RESOURCES;
}
/* Add it to the list */
DeviceInfoEntry->DeviceInformation = DeviceInformation;
InsertTailList(DeviceInfoList, &DeviceInfoEntry->DeviceInformationEntry);
NumberOfPaths = 0;
/* Count the amount of devices we will have to handle */
if (!IsListEmpty(&DeviceInformation->AssociatedDevicesHead))
{
for (Entry = DeviceInformation->AssociatedDevicesHead.Flink;
Entry != &DeviceInformation->AssociatedDevicesHead;
Entry = Entry->Flink)
{
++NumberOfPaths;
}
ASSERT(NumberOfPaths != 0);
/* And allocate a big enough buffer */
Paths = AllocatePool(NumberOfPaths * sizeof(PMOUNTMGR_VOLUME_PATHS));
if (Paths == NULL)
{
RemoveEntryList(&DeviceInfoEntry->DeviceInformationEntry);
FreePool(DeviceInfoEntry);
return STATUS_INSUFFICIENT_RESOURCES;
}
}
/* Start the hot loop to gather all the paths and be able to compute total output length! */
ReturnedPaths = 0;
CurrentPath = Paths;
for (Entry = DeviceInformation->AssociatedDevicesHead.Flink;
Entry != &DeviceInformation->AssociatedDevicesHead;
Entry = Entry->Flink)
{
USHORT InnerStrings;
BOOLEAN Invalid = FALSE;
AssociatedDeviceEntry = CONTAINING_RECORD(Entry, ASSOCIATED_DEVICE_ENTRY, AssociatedDevicesEntry);
/* Validate the fact its a mount point by query reparse data */
Status = MountMgrValidateBackPointer(AssociatedDeviceEntry, DeviceInformation, &Invalid);
/* If we found an invalid device, that's a failure */
if (Invalid)
{
*FailedDevice = AssociatedDeviceEntry->DeviceInformation;
Status = STATUS_UNSUCCESSFUL;
}
/* Check whether we failed, if so, bail out */
if (!NT_SUCCESS(Status))
{
ULONG i;
for (i = 0; i < ReturnedPaths; ++i)
{
FreePool(Paths[i]);
}
if (Paths != NULL)
{
FreePool(Paths);
}
RemoveEntryList(&DeviceInfoEntry->DeviceInformationEntry);
FreePool(DeviceInfoEntry);
return Status;
}
/* Query associated paths (hello ourselves :-)) */
Status = MountMgrQueryVolumePaths(DeviceExtension,
AssociatedDeviceEntry->DeviceInformation,
DeviceInfoList,
CurrentPath,
FailedDevice);
if (!NT_SUCCESS(Status))
{
ULONG i;
for (i = 0; i < ReturnedPaths; ++i)
{
FreePool(Paths[i]);
}
if (Paths != NULL)
{
FreePool(Paths);
}
RemoveEntryList(&DeviceInfoEntry->DeviceInformationEntry);
FreePool(DeviceInfoEntry);
return Status;
}
/* Count the number of strings we have in the multi string buffer */
InnerStrings = 0;
if ((*CurrentPath)->MultiSzLength != sizeof(UNICODE_NULL))
{
ULONG i;
PWSTR MultiSz = (*CurrentPath)->MultiSz;
for (i = 0; i < (*CurrentPath)->MultiSzLength / sizeof(WCHAR); ++i, ++MultiSz)
{
if (*MultiSz == UNICODE_NULL)
{
++InnerStrings;
}
}
}
/* We returned one more path (ie, one more allocated buffer) */
++ReturnedPaths;
/* Move the next pointer to use in the array */
++CurrentPath;
/* Multiply String.Length by the number of found paths, we always add it after a path */
OutputPathLength += (*CurrentPath)->MultiSzLength + InnerStrings * AssociatedDeviceEntry->String.Length - sizeof(UNICODE_NULL);
}
/* Allocate the output buffer */
*VolumePaths = AllocatePool(sizeof(ULONG) + OutputPathLength);
if (*VolumePaths == NULL)
{
ULONG i;
for (i = 0; i < ReturnedPaths; ++i)
{
FreePool(Paths[i]);
}
if (Paths != NULL)
{
FreePool(Paths);
}
RemoveEntryList(&DeviceInfoEntry->DeviceInformationEntry);
FreePool(DeviceInfoEntry);
return STATUS_INSUFFICIENT_RESOURCES;
}
Written = 0;
/* If we had found a DOS letter, that's the first thing we return */
(*VolumePaths)->MultiSzLength = OutputPathLength;
if (SymlinkInformation != NULL)
{
(*VolumePaths)->MultiSz[0] = SymlinkInformation->Name.Buffer[LETTER_POSITION];
(*VolumePaths)->MultiSz[1] = L':';
(*VolumePaths)->MultiSz[2] = UNICODE_NULL;
Written = 3;
}
/* Now, browse again all our paths to return them */
CurrentPath = Paths;
for (Entry = DeviceInformation->AssociatedDevicesHead.Flink;
Entry != &DeviceInformation->AssociatedDevicesHead;
Entry = Entry->Flink)
{
AssociatedDeviceEntry = CONTAINING_RECORD(Entry, ASSOCIATED_DEVICE_ENTRY, AssociatedDevicesEntry);
/* If we had a path... */
if ((*CurrentPath)->MultiSzLength != sizeof(UNICODE_NULL))
{
ULONG i, Offset;
PWSTR MultiSz;
/* This offset is used to "jump" into MultiSz, so, start with the string begin (ie, skip MultiSzLength) */
Offset = sizeof(ULONG);
/* Browse every single letter, and skip last UNICODE_NULL */
for (i = 0; i < (*CurrentPath)->MultiSzLength / sizeof(WCHAR) - 1; ++i)
{
/* Get the letter */
MultiSz = (PWSTR)((ULONG_PTR)(*CurrentPath) + Offset);
/* If it was part of the path, just return it */
if (*MultiSz != UNICODE_NULL)
{
(*VolumePaths)->MultiSz[Written] = *MultiSz;
}
else
{
/* Otherwise, as planed, return our whole associated device name */
RtlCopyMemory(&(*VolumePaths)->MultiSz[Written],
AssociatedDeviceEntry->String.Buffer,
AssociatedDeviceEntry->String.Length);
Written += AssociatedDeviceEntry->String.Length / sizeof(WCHAR);
/* And don't forget to nullify */
(*VolumePaths)->MultiSz[Written] = UNICODE_NULL;
}
/* We at least return a letter or a null char */
++Written;
/* Move to the next letter */
Offset += sizeof(WCHAR);
}
}
FreePool(*CurrentPath);
++CurrentPath;
}
/* MultiSz: don't forget last null char */
(*VolumePaths)->MultiSz[Written] = UNICODE_NULL;
/* Cleanup everything and return success! */
if (Paths != NULL)
{
FreePool(Paths);
}
RemoveEntryList(&DeviceInfoEntry->DeviceInformationEntry);
FreePool(DeviceInfoEntry);
return STATUS_SUCCESS;
}
/*
* @implemented
*/
NTSTATUS
MountMgrQueryDosVolumePaths(IN PDEVICE_EXTENSION DeviceExtension,
IN PIRP Irp)
{
NTSTATUS Status;
PLIST_ENTRY Entry;
LIST_ENTRY Devices;
BOOLEAN NeedNotification;
PIO_STACK_LOCATION Stack;
UNICODE_STRING SymbolicName;
ULONG Attempts, OutputLength;
PMOUNTMGR_TARGET_NAME Target;
PMOUNTMGR_VOLUME_PATHS Paths, Output;
RECONCILE_WORK_ITEM_CONTEXT ReconcileContext;
PDEVICE_INFORMATION DeviceInformation, ListDeviceInfo, FailedDevice;
Stack = IoGetCurrentIrpStackLocation(Irp);
/* Validate input size */
if (Stack->Parameters.DeviceIoControl.InputBufferLength < sizeof(MOUNTMGR_TARGET_NAME))
{
return STATUS_INVALID_PARAMETER;
}
/* Ensure we have received UNICODE_STRING */
Target = (PMOUNTMGR_TARGET_NAME)Irp->AssociatedIrp.SystemBuffer;
if (Target->DeviceNameLength & 1)
{
return STATUS_INVALID_PARAMETER;
}
/* Validate the entry structure size */
if (Target->DeviceNameLength + FIELD_OFFSET(MOUNTMGR_TARGET_NAME, DeviceName) > Stack->Parameters.DeviceIoControl.InputBufferLength)
{
return STATUS_INVALID_PARAMETER;
}
/* Ensure we can at least return needed size */
if (Stack->Parameters.DeviceIoControl.OutputBufferLength < sizeof(ULONG))
{
return STATUS_INVALID_PARAMETER;
}
/* Construct string for query */
SymbolicName.Length = Target->DeviceNameLength;
SymbolicName.MaximumLength = Target->DeviceNameLength + sizeof(UNICODE_NULL);
SymbolicName.Buffer = Target->DeviceName;
/* Find device with our info */
Status = FindDeviceInfo(DeviceExtension, &SymbolicName, FALSE, &DeviceInformation);
if (!NT_SUCCESS(Status))
{
return Status;
}
NeedNotification = FALSE;
Attempts = 0;
for (;;)
{
FailedDevice = NULL;
InitializeListHead(&Devices);
/* Query paths */
Status = MountMgrQueryVolumePaths(DeviceExtension, DeviceInformation, &Devices, &Paths, &FailedDevice);
if (NT_SUCCESS(Status))
{
break;
}
/* If it failed for generic reason (memory, whatever), bail out (ie, FailedDevice not set) */
if (FailedDevice == NULL)
{
return Status;
}
/* If PnP, let's notify in case of success */
if (!DeviceInformation->ManuallyRegistered)
{
NeedNotification = TRUE;
}
/* Reconcile database */
ReconcileContext.DeviceExtension = DeviceExtension;
ReconcileContext.DeviceInformation = FailedDevice;
KeReleaseSemaphore(&DeviceExtension->DeviceLock, IO_NO_INCREMENT, 1, FALSE);
ReconcileThisDatabaseWithMasterWorker(&ReconcileContext);
KeWaitForSingleObject(&DeviceExtension->DeviceLock, Executive, KernelMode, FALSE, NULL);
/* Look for our device, to check it's online */
for (Entry = DeviceExtension->DeviceListHead.Flink;
Entry != &DeviceExtension->DeviceListHead;
Entry = Entry->Flink)
{
ListDeviceInfo = CONTAINING_RECORD(Entry, DEVICE_INFORMATION, DeviceListEntry);
/* It's online, it's OK! */
if (ListDeviceInfo == DeviceInformation)
{
break;
}
}
/* It's not online, it's not good */
if (Entry == &DeviceExtension->DeviceListHead)
{
return STATUS_OBJECT_NAME_NOT_FOUND;
}
/* Increase attempts count */
++Attempts;
/* Don't look forever and fail if we get out of attempts */
if (Attempts >= 1000)
{
return Status;
}
}
/* We need to notify? Go ahead */
if (NeedNotification)
{
MountMgrNotifyNameChange(DeviceExtension, &SymbolicName, FALSE);
}
/* Get output buffer */
Output = (PMOUNTMGR_VOLUME_PATHS)Irp->AssociatedIrp.SystemBuffer;
/* Set required size */
Output->MultiSzLength = Paths->MultiSzLength;
/* Compute total length */
OutputLength = Output->MultiSzLength + sizeof(ULONG);
/* If it cannot fit, just return need size and quit */
if (OutputLength > Stack->Parameters.DeviceIoControl.OutputBufferLength)
{
Irp->IoStatus.Information = sizeof(ULONG);
FreePool(Paths);
return STATUS_BUFFER_OVERFLOW;
}
/* Copy data and quit */
Irp->IoStatus.Information = OutputLength;
RtlCopyMemory(Output->MultiSz, Paths->MultiSz, Output->MultiSzLength);
FreePool(Paths);
return STATUS_SUCCESS;
}
/*
* @implemented
*/
NTSTATUS
MountMgrKeepLinksWhenOffline(IN PDEVICE_EXTENSION DeviceExtension,
IN PIRP Irp)
{
NTSTATUS Status;
PIO_STACK_LOCATION Stack;
UNICODE_STRING SymbolicName;
PMOUNTMGR_TARGET_NAME Target;
PDEVICE_INFORMATION DeviceInformation;
Stack = IoGetCurrentIrpStackLocation(Irp);
/* Validate input */
if (Stack->Parameters.DeviceIoControl.InputBufferLength < sizeof(MOUNTMGR_TARGET_NAME))
{
return STATUS_INVALID_PARAMETER;
}
Target = (PMOUNTMGR_TARGET_NAME)Irp->AssociatedIrp.SystemBuffer;
if (Target->DeviceNameLength + sizeof(USHORT) > Stack->Parameters.DeviceIoControl.InputBufferLength)
{
return STATUS_INVALID_PARAMETER;
}
SymbolicName.Length =
SymbolicName.MaximumLength = Target->DeviceNameLength;
SymbolicName.Buffer = Target->DeviceName;
/* Find the associated device */
Status = FindDeviceInfo(DeviceExtension, &SymbolicName, FALSE, &DeviceInformation);
if (!NT_SUCCESS(Status))
{
return Status;
}
/* Mark we want to keep links */
DeviceInformation->KeepLinks = TRUE;
return STATUS_SUCCESS;
}
/*
* @implemented
*/
NTSTATUS
MountMgrVolumeArrivalNotification(IN PDEVICE_EXTENSION DeviceExtension,
IN PIRP Irp)
{
NTSTATUS Status;
BOOLEAN OldState;
PIO_STACK_LOCATION Stack;
UNICODE_STRING SymbolicName;
PMOUNTMGR_TARGET_NAME Target;
Stack = IoGetCurrentIrpStackLocation(Irp);
/* Validate input */
if (Stack->Parameters.DeviceIoControl.InputBufferLength < sizeof(MOUNTMGR_TARGET_NAME))
{
return STATUS_INVALID_PARAMETER;
}
Target = (PMOUNTMGR_TARGET_NAME)Irp->AssociatedIrp.SystemBuffer;
if (Target->DeviceNameLength + sizeof(USHORT) > Stack->Parameters.DeviceIoControl.InputBufferLength)
{
return STATUS_INVALID_PARAMETER;
}
SymbolicName.Length =
SymbolicName.MaximumLength = Target->DeviceNameLength;
SymbolicName.Buffer = Target->DeviceName;
/* Disable hard errors */
OldState = PsGetThreadHardErrorsAreDisabled(PsGetCurrentThread());
PsSetThreadHardErrorsAreDisabled(PsGetCurrentThread(), TRUE);
/* Call real worker */
Status = MountMgrMountedDeviceArrival(DeviceExtension, &SymbolicName, TRUE);
PsSetThreadHardErrorsAreDisabled(PsGetCurrentThread(), OldState);
return Status;
}
/*
* @implemented
*/
NTSTATUS
MountMgrQueryPoints(IN PDEVICE_EXTENSION DeviceExtension,
IN PIRP Irp)
{
NTSTATUS Status;
PIO_STACK_LOCATION Stack;
PMOUNTDEV_UNIQUE_ID UniqueId;
PMOUNTMGR_MOUNT_POINT MountPoint;
UNICODE_STRING SymbolicName, DeviceName;
Stack = IoGetCurrentIrpStackLocation(Irp);
/* Validate input... */
if (Stack->Parameters.DeviceIoControl.InputBufferLength < sizeof(MOUNTMGR_MOUNT_POINT))
{
return STATUS_INVALID_PARAMETER;
}
MountPoint = (PMOUNTMGR_MOUNT_POINT)Irp->AssociatedIrp.SystemBuffer;
if (!MountPoint->SymbolicLinkNameLength)
{
MountPoint->SymbolicLinkNameOffset = 0;
}
if (!MountPoint->UniqueIdLength)
{
MountPoint->UniqueIdOffset = 0;
}
if (!MountPoint->DeviceNameLength)
{
MountPoint->DeviceNameOffset = 0;
}
/* Addresses can't be odd */
if ((MountPoint->SymbolicLinkNameOffset & 1) ||
(MountPoint->SymbolicLinkNameLength & 1))
{
return STATUS_INVALID_PARAMETER;
}
if ((MountPoint->UniqueIdOffset & 1) ||
(MountPoint->UniqueIdLength & 1))
{
return STATUS_INVALID_PARAMETER;
}
if ((MountPoint->DeviceNameOffset & 1) ||
(MountPoint->DeviceNameLength & 1))
{
return STATUS_INVALID_PARAMETER;
}
/* We can't go beyond */
if (((ULONG)MountPoint->SymbolicLinkNameLength + MountPoint->UniqueIdLength +
MountPoint->DeviceNameLength) > Stack->Parameters.DeviceIoControl.InputBufferLength)
{
return STATUS_INVALID_PARAMETER;
}
if (Stack->Parameters.DeviceIoControl.OutputBufferLength < sizeof(MOUNTMGR_MOUNT_POINTS))
{
return STATUS_INVALID_PARAMETER;
}
/* If caller provided a Symlink, use it */
if (MountPoint->SymbolicLinkNameLength != 0)
{
if (MountPoint->SymbolicLinkNameLength > MAXSHORT)
{
return STATUS_INVALID_PARAMETER;
}
SymbolicName.Length = MountPoint->SymbolicLinkNameLength;
SymbolicName.MaximumLength = MountPoint->SymbolicLinkNameLength + sizeof(WCHAR);
SymbolicName.Buffer = AllocatePool(SymbolicName.MaximumLength);
if (!SymbolicName.Buffer)
{
return STATUS_INSUFFICIENT_RESOURCES;
}
RtlCopyMemory(SymbolicName.Buffer,
(PWSTR)((ULONG_PTR)MountPoint + MountPoint->SymbolicLinkNameOffset),
SymbolicName.Length);
SymbolicName.Buffer[SymbolicName.Length / sizeof(WCHAR)] = UNICODE_NULL;
/* Query links using it */
Status = QueryPointsFromSymbolicLinkName(DeviceExtension, &SymbolicName, Irp);
FreePool(SymbolicName.Buffer);
}
/* If user provided an unique ID */
else if (MountPoint->UniqueIdLength != 0)
{
UniqueId = AllocatePool(MountPoint->UniqueIdLength + sizeof(MOUNTDEV_UNIQUE_ID));
if (!UniqueId)
{
return STATUS_INSUFFICIENT_RESOURCES;
}
UniqueId->UniqueIdLength = MountPoint->UniqueIdLength;
RtlCopyMemory(UniqueId->UniqueId,
(PVOID)((ULONG_PTR)MountPoint + MountPoint->UniqueIdOffset),
MountPoint->UniqueIdLength);
/* Query links using it */
Status = QueryPointsFromMemory(DeviceExtension, Irp, UniqueId, NULL);
FreePool(UniqueId);
}
/* If caller provided a device name */
else if (MountPoint->DeviceNameLength != 0)
{
if (MountPoint->DeviceNameLength > MAXSHORT)
{
return STATUS_INVALID_PARAMETER;
}
DeviceName.Length = MountPoint->DeviceNameLength;
DeviceName.MaximumLength = MountPoint->DeviceNameLength + sizeof(WCHAR);
DeviceName.Buffer = AllocatePool(DeviceName.MaximumLength);
if (!DeviceName.Buffer)
{
return STATUS_INSUFFICIENT_RESOURCES;
}
RtlCopyMemory(DeviceName.Buffer,
(PWSTR)((ULONG_PTR)MountPoint + MountPoint->DeviceNameOffset),
DeviceName.Length);
DeviceName.Buffer[DeviceName.Length / sizeof(WCHAR)] = UNICODE_NULL;
/* Query links using it */
Status = QueryPointsFromMemory(DeviceExtension, Irp, NULL, &DeviceName);
FreePool(DeviceName.Buffer);
}
else
{
/* Otherwise, query all links */
Status = QueryPointsFromMemory(DeviceExtension, Irp, NULL, NULL);
}
return Status;
}
/*
* @implemented
*/
NTSTATUS
MountMgrDeletePoints(IN PDEVICE_EXTENSION DeviceExtension,
IN PIRP Irp)
{
ULONG Link;
NTSTATUS Status;
BOOLEAN CreateNoDrive;
PIO_STACK_LOCATION Stack;
PMOUNTDEV_UNIQUE_ID UniqueId;
PMOUNTMGR_MOUNT_POINT MountPoint;
PMOUNTMGR_MOUNT_POINTS MountPoints;
UNICODE_STRING SymbolicName, DeviceName;
Stack = IoGetCurrentIrpStackLocation(Irp);
/* Validate input */
if (Stack->Parameters.DeviceIoControl.InputBufferLength < sizeof(MOUNTMGR_MOUNT_POINT))
{
return STATUS_INVALID_PARAMETER;
}
/* Query points */
MountPoint = (PMOUNTMGR_MOUNT_POINT)Irp->AssociatedIrp.SystemBuffer;
CreateNoDrive = (MountPoint->SymbolicLinkNameOffset && MountPoint->SymbolicLinkNameLength);
Status = MountMgrQueryPoints(DeviceExtension, Irp);
if (!NT_SUCCESS(Status))
{
return Status;
}
/* For all the points matching the request */
MountPoints = (PMOUNTMGR_MOUNT_POINTS)Irp->AssociatedIrp.SystemBuffer;
for (Link = 0; Link < MountPoints->NumberOfMountPoints; Link++)
{
SymbolicName.Length = MountPoints->MountPoints[Link].SymbolicLinkNameLength;
SymbolicName.MaximumLength = SymbolicName.Length + sizeof(WCHAR);
SymbolicName.Buffer = AllocatePool(SymbolicName.MaximumLength);
if (!SymbolicName.Buffer)
{
return STATUS_INSUFFICIENT_RESOURCES;
}
RtlCopyMemory(SymbolicName.Buffer,
(PWSTR)((ULONG_PTR)MountPoints + MountPoints->MountPoints[Link].SymbolicLinkNameOffset),
SymbolicName.Length);
SymbolicName.Buffer[SymbolicName.Length / sizeof(WCHAR)] = UNICODE_NULL;
/* Create a no drive entry for the drive letters */
if (CreateNoDrive && IsDriveLetter(&SymbolicName))
{
UniqueId = AllocatePool(MountPoints->MountPoints[Link].UniqueIdLength + sizeof(MOUNTDEV_UNIQUE_ID));
if (UniqueId)
{
UniqueId->UniqueIdLength = MountPoints->MountPoints[Link].UniqueIdLength;
RtlCopyMemory(UniqueId->UniqueId,
(PMOUNTDEV_UNIQUE_ID)((ULONG_PTR)MountPoints + MountPoints->MountPoints[Link].UniqueIdOffset),
MountPoints->MountPoints[Link].UniqueIdLength);
CreateNoDriveLetterEntry(UniqueId);
FreePool(UniqueId);
}
}
/* If there are no link any more, and no need to create a no drive entry */
if (Link == 0 && !CreateNoDrive)
{
/* Then, delete everything */
UniqueId = AllocatePool(MountPoints->MountPoints[Link].UniqueIdLength);
if (UniqueId)
{
RtlCopyMemory(UniqueId,
(PMOUNTDEV_UNIQUE_ID)((ULONG_PTR)MountPoints + MountPoints->MountPoints[Link].UniqueIdOffset),
MountPoints->MountPoints[Link].UniqueIdLength);
DeleteNoDriveLetterEntry(UniqueId);
FreePool(UniqueId);
}
}
/* Delete all the information about the mount point */
GlobalDeleteSymbolicLink(&SymbolicName);
DeleteSymbolicLinkNameFromMemory(DeviceExtension, &SymbolicName, FALSE);
RtlDeleteRegistryValue(RTL_REGISTRY_ABSOLUTE, DatabasePath, SymbolicName.Buffer);
FreePool(SymbolicName.Buffer);
/* Notify the change */
DeviceName.Length = DeviceName.MaximumLength =
MountPoints->MountPoints[Link].DeviceNameLength;
DeviceName.Buffer = (PWSTR)((ULONG_PTR)MountPoints + MountPoints->MountPoints[Link].DeviceNameOffset);
MountMgrNotifyNameChange(DeviceExtension, &DeviceName, TRUE);
}
MountMgrNotify(DeviceExtension);
return Status;
}
/*
* @implemented
*/
NTSTATUS
MountMgrDeletePointsDbOnly(IN PDEVICE_EXTENSION DeviceExtension,
IN PIRP Irp)
{
ULONG Link;
NTSTATUS Status;
UNICODE_STRING SymbolicName;
PMOUNTDEV_UNIQUE_ID UniqueId;
PMOUNTMGR_MOUNT_POINTS MountPoints;
/* Query points */
Status = MountMgrQueryPoints(DeviceExtension, Irp);
if (!NT_SUCCESS(Status))
{
return Status;
}
MountPoints = (PMOUNTMGR_MOUNT_POINTS)Irp->AssociatedIrp.SystemBuffer;
if (MountPoints->NumberOfMountPoints == 0)
{
return Status;
}
/* For all the mount points */
for (Link = 0; Link < MountPoints->NumberOfMountPoints; Link++)
{
SymbolicName.Length = MountPoints->MountPoints[Link].SymbolicLinkNameLength;
SymbolicName.MaximumLength = SymbolicName.Length + sizeof(WCHAR);
SymbolicName.Buffer = AllocatePool(SymbolicName.MaximumLength);
if (!SymbolicName.Buffer)
{
return STATUS_INSUFFICIENT_RESOURCES;
}
RtlCopyMemory(SymbolicName.Buffer,
(PWSTR)((ULONG_PTR)MountPoints + MountPoints->MountPoints[Link].SymbolicLinkNameOffset),
SymbolicName.Length);
SymbolicName.Buffer[SymbolicName.Length / sizeof(WCHAR)] = UNICODE_NULL;
/* If the only mount point is a drive letter, then create a no letter drive entry */
if (MountPoints->NumberOfMountPoints == 1 && IsDriveLetter(&SymbolicName))
{
UniqueId = AllocatePool(MountPoints->MountPoints[Link].UniqueIdLength + sizeof(MOUNTDEV_UNIQUE_ID));
if (UniqueId)
{
UniqueId->UniqueIdLength = MountPoints->MountPoints[Link].UniqueIdLength;
RtlCopyMemory(UniqueId->UniqueId,
(PMOUNTDEV_UNIQUE_ID)((ULONG_PTR)MountPoints + MountPoints->MountPoints[Link].UniqueIdOffset),
MountPoints->MountPoints[Link].UniqueIdLength);
CreateNoDriveLetterEntry(UniqueId);
FreePool(UniqueId);
}
}
/* Simply delete mount point from DB */
DeleteSymbolicLinkNameFromMemory(DeviceExtension, &SymbolicName, TRUE);
RtlDeleteRegistryValue(RTL_REGISTRY_ABSOLUTE, DatabasePath, SymbolicName.Buffer);
FreePool(SymbolicName.Buffer);
}
return Status;
}
/*
* @implemented
*/
NTSTATUS
MountMgrVolumeMountPointChanged(IN PDEVICE_EXTENSION DeviceExtension,
IN PIRP Irp,
IN NTSTATUS LockStatus,
OUT PUNICODE_STRING SourceDeviceName,
OUT PUNICODE_STRING SourceSymbolicName,
OUT PUNICODE_STRING TargetVolumeName)
{
HANDLE Handle;
NTSTATUS Status;
PFILE_OBJECT FileObject;
PIO_STACK_LOCATION Stack;
ULONG Length, SavedLength;
BOOLEAN FOReferenced = FALSE;
IO_STATUS_BLOCK IoStatusBlock;
OBJECT_ATTRIBUTES ObjectAttributes;
PDEVICE_INFORMATION DeviceInformation;
OBJECT_NAME_INFORMATION ObjectNameInfo;
FILE_FS_DEVICE_INFORMATION FsDeviceInfo;
PFILE_NAME_INFORMATION FileNameInfo = NULL;
PMOUNTMGR_VOLUME_MOUNT_POINT VolumeMountPoint;
POBJECT_NAME_INFORMATION ObjectNameInfoPtr = NULL;
UNICODE_STRING SourceVolumeName, TargetDeviceName;
Stack = IoGetCurrentIrpStackLocation(Irp);
/* Validate input */
if (Stack->Parameters.DeviceIoControl.InputBufferLength < sizeof(MOUNTMGR_VOLUME_MOUNT_POINT))
{
return STATUS_INVALID_PARAMETER;
}
VolumeMountPoint = (PMOUNTMGR_VOLUME_MOUNT_POINT)Irp->AssociatedIrp.SystemBuffer;
if (((ULONG)VolumeMountPoint->SourceVolumeNameLength + VolumeMountPoint->TargetVolumeNameLength) <
Stack->Parameters.DeviceIoControl.InputBufferLength)
{
return STATUS_INVALID_PARAMETER;
}
/* Get source volume name */
SourceVolumeName.Length =
SourceVolumeName.MaximumLength = VolumeMountPoint->SourceVolumeNameLength;
SourceVolumeName.Buffer = (PWSTR)((ULONG_PTR)VolumeMountPoint + VolumeMountPoint->SourceVolumeNameOffset);
InitializeObjectAttributes(&ObjectAttributes,
&SourceVolumeName,
OBJ_KERNEL_HANDLE | OBJ_CASE_INSENSITIVE,
NULL,
NULL);
/* Open it */
Status = ZwOpenFile(&Handle,
SYNCHRONIZE | FILE_READ_ATTRIBUTES,
&ObjectAttributes,
&IoStatusBlock,
FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
FILE_SYNCHRONOUS_IO_NONALERT | FILE_OPEN_REPARSE_POINT);
if (!NT_SUCCESS(Status))
{
return Status;
}
TargetDeviceName.Buffer = NULL;
/* Query its attributes */
Status = ZwQueryVolumeInformationFile(Handle,
&IoStatusBlock,
&FsDeviceInfo,
sizeof(FsDeviceInfo),
FileFsDeviceInformation);
if (!NT_SUCCESS(Status))
{
goto Cleanup;
}
if (FsDeviceInfo.DeviceType != FILE_DEVICE_DISK && FsDeviceInfo.DeviceType != FILE_DEVICE_VIRTUAL_DISK)
{
goto Cleanup;
}
if (FsDeviceInfo.Characteristics != (FILE_REMOTE_DEVICE | FILE_REMOVABLE_MEDIA))
{
goto Cleanup;
}
/* Reference it */
Status = ObReferenceObjectByHandle(Handle, 0, *IoFileObjectType, KernelMode, (PVOID *)&FileObject, NULL);
if (!NT_SUCCESS(Status))
{
goto Cleanup;
}
FOReferenced = TRUE;
/* Get file name */
FileNameInfo = AllocatePool(sizeof(FILE_NAME_INFORMATION));
if (!FileNameInfo)
{
Status = STATUS_INSUFFICIENT_RESOURCES;
goto Cleanup;
}
Status = ZwQueryInformationFile(Handle, &IoStatusBlock, FileNameInfo,
sizeof(FILE_NAME_INFORMATION),
FileNameInformation);
if (Status == STATUS_BUFFER_OVERFLOW)
{
/* Now we have real length, use it */
Length = FileNameInfo->FileNameLength;
FreePool(FileNameInfo);
FileNameInfo = AllocatePool(sizeof(FILE_NAME_INFORMATION) + Length);
if (!FileNameInfo)
{
Status = STATUS_INSUFFICIENT_RESOURCES;
goto Cleanup;
}
/* Really query file name */
Status = ZwQueryInformationFile(Handle, &IoStatusBlock, FileNameInfo,
sizeof(FILE_NAME_INFORMATION) + Length,
FileNameInformation);
}
if (!NT_SUCCESS(Status))
{
goto Cleanup;
}
/* Get symbolic name */
ObjectNameInfoPtr = &ObjectNameInfo;
SavedLength = sizeof(OBJECT_NAME_INFORMATION);
Status = ObQueryNameString(FileObject->DeviceObject, ObjectNameInfoPtr, sizeof(OBJECT_NAME_INFORMATION), &Length);
if (Status == STATUS_INFO_LENGTH_MISMATCH)
{
/* Once again, with proper size, it works better */
ObjectNameInfoPtr = AllocatePool(Length);
if (!ObjectNameInfoPtr)
{
Status = STATUS_INSUFFICIENT_RESOURCES;
goto Cleanup;
}
SavedLength = Length;
Status = ObQueryNameString(FileObject->DeviceObject, ObjectNameInfoPtr, SavedLength, &Length);
}
if (!NT_SUCCESS(Status))
{
goto Cleanup;
}
/* Now, query the device name */
Status = QueryDeviceInformation(&ObjectNameInfoPtr->Name, SourceDeviceName,
NULL, NULL, NULL, NULL, NULL, NULL);
if (!NT_SUCCESS(Status))
{
goto Cleanup;
}
/* For target volume name, use input */
TargetVolumeName->Length =
TargetVolumeName->MaximumLength = VolumeMountPoint->TargetVolumeNameLength;
TargetVolumeName->Buffer = (PWSTR)((ULONG_PTR)VolumeMountPoint + VolumeMountPoint->TargetVolumeNameOffset);
/* Query its device name */
Status = QueryDeviceInformation(TargetVolumeName, &TargetDeviceName,
NULL, NULL, NULL, NULL, NULL, NULL);
if (!NT_SUCCESS(Status))
{
goto Cleanup;
}
/* Return symbolic name */
SourceSymbolicName->Length =
SourceSymbolicName->MaximumLength = (USHORT)FileNameInfo->FileNameLength;
SourceSymbolicName->Buffer = (PWSTR)FileNameInfo;
/* memmove allows memory overlap */
RtlMoveMemory(SourceSymbolicName->Buffer, FileNameInfo->FileName, SourceSymbolicName->Length);
FileNameInfo = NULL;
/* Notify the change */
MountMgrNotify(DeviceExtension);
MountMgrNotifyNameChange(DeviceExtension, &TargetDeviceName, TRUE);
/* If we are locked, sync databases if possible */
if (NT_SUCCESS(LockStatus))
{
Status = FindDeviceInfo(DeviceExtension, SourceDeviceName, FALSE, &DeviceInformation);
if (NT_SUCCESS(Status))
{
ReconcileThisDatabaseWithMaster(DeviceExtension, DeviceInformation);
}
else
{
Status = STATUS_PENDING;
}
}
Cleanup:
if (TargetDeviceName.Buffer)
{
FreePool(TargetDeviceName.Buffer);
}
if (ObjectNameInfoPtr && ObjectNameInfoPtr != &ObjectNameInfo)
{
FreePool(ObjectNameInfoPtr);
}
if (FileNameInfo)
{
FreePool(FileNameInfo);
}
if (FOReferenced)
{
ObDereferenceObject(FileObject);
}
return Status;
}
/*
* @implemented
*/
NTSTATUS
MountMgrVolumeMountPointCreated(IN PDEVICE_EXTENSION DeviceExtension,
IN PIRP Irp,
IN NTSTATUS LockStatus)
{
LONG Offset;
BOOLEAN Found;
NTSTATUS Status;
HANDLE RemoteDatabase;
PMOUNTDEV_UNIQUE_ID UniqueId;
PDATABASE_ENTRY DatabaseEntry;
PASSOCIATED_DEVICE_ENTRY AssociatedEntry;
PDEVICE_INFORMATION DeviceInformation, TargetDeviceInformation;
UNICODE_STRING LinkTarget, SourceDeviceName, SourceSymbolicName, TargetVolumeName, VolumeName, DbName;
/* Initialize string */
LinkTarget.Length = 0;
LinkTarget.MaximumLength = 0xC8;
LinkTarget.Buffer = AllocatePool(LinkTarget.MaximumLength);
if (LinkTarget.Buffer == NULL)
{
return STATUS_INSUFFICIENT_RESOURCES;
}
/* If the mount point was created, then, it changed!
* Also use it to query some information
*/
Status = MountMgrVolumeMountPointChanged(DeviceExtension, Irp, LockStatus, &SourceDeviceName, &SourceSymbolicName, &TargetVolumeName);
/* Pending means DB are under synchronization, bail out */
if (Status == STATUS_PENDING)
{
FreePool(LinkTarget.Buffer);
FreePool(SourceDeviceName.Buffer);
FreePool(SourceSymbolicName.Buffer);
return STATUS_SUCCESS;
}
else if (!NT_SUCCESS(Status))
{
FreePool(LinkTarget.Buffer);
return Status;
}
/* Query the device information */
Status = FindDeviceInfo(DeviceExtension, &SourceDeviceName, FALSE, &DeviceInformation);
if (!NT_SUCCESS(Status))
{
/* If it failed, first try to get volume name */
Status = QueryVolumeName(0, NULL, &SourceDeviceName, &LinkTarget, &VolumeName);
if (!NT_SUCCESS(Status))
{
/* Then, try to read the symlink */
Status = MountMgrQuerySymbolicLink(&SourceDeviceName, &LinkTarget);
if (!NT_SUCCESS(Status))
{
FreePool(LinkTarget.Buffer);
FreePool(SourceDeviceName.Buffer);
FreePool(SourceSymbolicName.Buffer);
return Status;
}
}
else
{
FreePool(VolumeName.Buffer);
}
FreePool(SourceDeviceName.Buffer);
SourceDeviceName.Length = LinkTarget.Length;
SourceDeviceName.MaximumLength = LinkTarget.MaximumLength;
SourceDeviceName.Buffer = LinkTarget.Buffer;
/* Now that we have the correct source, reattempt to query information */
Status = FindDeviceInfo(DeviceExtension, &SourceDeviceName, FALSE, &DeviceInformation);
if (!NT_SUCCESS(Status))
{
FreePool(SourceDeviceName.Buffer);
FreePool(SourceSymbolicName.Buffer);
return Status;
}
}
FreePool(SourceDeviceName.Buffer);
/* Get information about target device */
Status = FindDeviceInfo(DeviceExtension, &TargetVolumeName, FALSE, &TargetDeviceInformation);
if (!NT_SUCCESS(Status))
{
FreePool(SourceSymbolicName.Buffer);
return Status;
}
/* Notify if not disabled */
if (!TargetDeviceInformation->SkipNotifications)
{
PostOnlineNotification(DeviceExtension, &TargetDeviceInformation->SymbolicName);
}
/* Open the remote database */
RemoteDatabase = OpenRemoteDatabase(DeviceInformation, TRUE);
if (RemoteDatabase == 0)
{
FreePool(SourceSymbolicName.Buffer);
return STATUS_INSUFFICIENT_RESOURCES;
}
/* Browse all the entries */
Offset = 0;
Found = FALSE;
for (;;)
{
DatabaseEntry = GetRemoteDatabaseEntry(RemoteDatabase, Offset);
if (DatabaseEntry == NULL)
{
break;
}
/* Try to find ourselves */
DbName.MaximumLength = DatabaseEntry->SymbolicNameLength;
DbName.Length = DbName.MaximumLength;
DbName.Buffer = (PWSTR)((ULONG_PTR)DatabaseEntry + DatabaseEntry->SymbolicNameOffset);
if (RtlEqualUnicodeString(&TargetVolumeName, &DbName, TRUE))
{
/* Reference ourselves and update the entry */
++DatabaseEntry->EntryReferences;
Status = WriteRemoteDatabaseEntry(RemoteDatabase, Offset, DatabaseEntry);
FreePool(DatabaseEntry);
Found = TRUE;
break;
}
Offset += DatabaseEntry->EntrySize;
FreePool(DatabaseEntry);
}
/* We couldn't find ourselves, we'll have to add ourselves */
if (!Found)
{
ULONG EntrySize;
PUNIQUE_ID_REPLICATE UniqueIdReplicate;
/* Query the device unique ID */
Status = QueryDeviceInformation(&TargetVolumeName, NULL, &UniqueId, NULL, NULL, NULL, NULL, NULL);
if (!NT_SUCCESS(Status))
{
FreePool(SourceSymbolicName.Buffer);
CloseRemoteDatabase(RemoteDatabase);
return Status;
}
/* Allocate a database entry */
EntrySize = UniqueId->UniqueIdLength + TargetVolumeName.Length + sizeof(DATABASE_ENTRY);
DatabaseEntry = AllocatePool(EntrySize);
if (DatabaseEntry == NULL)
{
FreePool(UniqueId);
FreePool(SourceSymbolicName.Buffer);
CloseRemoteDatabase(RemoteDatabase);
return STATUS_INSUFFICIENT_RESOURCES;
}
/* Fill it in */
DatabaseEntry->EntrySize = EntrySize;
DatabaseEntry->EntryReferences = 1;
DatabaseEntry->SymbolicNameOffset = sizeof(DATABASE_ENTRY);
DatabaseEntry->SymbolicNameLength = TargetVolumeName.Length;
DatabaseEntry->UniqueIdOffset = TargetVolumeName.Length + sizeof(DATABASE_ENTRY);
DatabaseEntry->UniqueIdLength = UniqueId->UniqueIdLength;
RtlCopyMemory((PVOID)((ULONG_PTR)DatabaseEntry + sizeof(DATABASE_ENTRY)), TargetVolumeName.Buffer, DatabaseEntry->SymbolicNameLength);
RtlCopyMemory((PVOID)((ULONG_PTR)DatabaseEntry + DatabaseEntry->UniqueIdOffset), UniqueId->UniqueId, UniqueId->UniqueIdLength);
/* And write it down */
Status = AddRemoteDatabaseEntry(RemoteDatabase, DatabaseEntry);
FreePool(DatabaseEntry);
if (!NT_SUCCESS(Status))
{
FreePool(UniqueId);
FreePool(SourceSymbolicName.Buffer);
CloseRemoteDatabase(RemoteDatabase);
return Status;
}
/* And now, allocate an Unique ID item */
UniqueIdReplicate = AllocatePool(sizeof(UNIQUE_ID_REPLICATE));
if (UniqueIdReplicate == NULL)
{
FreePool(UniqueId);
FreePool(SourceSymbolicName.Buffer);
CloseRemoteDatabase(RemoteDatabase);
return Status;
}
/* To associate it with the device */
UniqueIdReplicate->UniqueId = UniqueId;
InsertTailList(&DeviceInformation->ReplicatedUniqueIdsListHead, &UniqueIdReplicate->ReplicatedUniqueIdsListEntry);
}
/* We're done with the remote database */
CloseRemoteDatabase(RemoteDatabase);
/* Check we were find writing the entry */
if (!NT_SUCCESS(Status))
{
FreePool(SourceSymbolicName.Buffer);
return Status;
}
/* This is the end, allocate an associated entry */
AssociatedEntry = AllocatePool(sizeof(ASSOCIATED_DEVICE_ENTRY));
if (AssociatedEntry == NULL)
{
FreePool(SourceSymbolicName.Buffer);
return STATUS_INSUFFICIENT_RESOURCES;
}
/* Initialize its source name string */
AssociatedEntry->String.Length = SourceSymbolicName.Length;
AssociatedEntry->String.MaximumLength = AssociatedEntry->String.Length + sizeof(UNICODE_NULL);
AssociatedEntry->String.Buffer = AllocatePool(AssociatedEntry->String.MaximumLength);
if (AssociatedEntry->String.Buffer == NULL)
{
FreePool(AssociatedEntry);
FreePool(SourceSymbolicName.Buffer);
return STATUS_INSUFFICIENT_RESOURCES;
}
/* Copy data & insert in list */
RtlCopyMemory(AssociatedEntry->String.Buffer, SourceSymbolicName.Buffer, SourceSymbolicName.Length);
AssociatedEntry->String.Buffer[SourceSymbolicName.Length / sizeof(WCHAR)] = UNICODE_NULL;
AssociatedEntry->DeviceInformation = DeviceInformation;
InsertTailList(&TargetDeviceInformation->AssociatedDevicesHead, &AssociatedEntry->AssociatedDevicesEntry);
/* We're done! */
FreePool(SourceSymbolicName.Buffer);
return STATUS_SUCCESS;
}
/*
* @implemented
*/
NTSTATUS
MountMgrVolumeMountPointDeleted(IN PDEVICE_EXTENSION DeviceExtension,
IN PIRP Irp,
IN NTSTATUS LockStatus)
{
LONG Offset;
NTSTATUS Status;
PLIST_ENTRY Entry;
HANDLE RemoteDatabase;
PDATABASE_ENTRY DatabaseEntry;
PUNIQUE_ID_REPLICATE UniqueIdReplicate;
PASSOCIATED_DEVICE_ENTRY AssociatedEntry;
PDEVICE_INFORMATION DeviceInformation, TargetDeviceInformation;
UNICODE_STRING LinkTarget, SourceDeviceName, SourceSymbolicName, TargetVolumeName, VolumeName, DbName;
/* Initialize string */
LinkTarget.Length = 0;
LinkTarget.MaximumLength = 0xC8;
LinkTarget.Buffer = AllocatePool(LinkTarget.MaximumLength);
if (LinkTarget.Buffer == NULL)
{
return STATUS_INSUFFICIENT_RESOURCES;
}
/* If the mount point was deleted, then, it changed!
* Also use it to query some information
*/
Status = MountMgrVolumeMountPointChanged(DeviceExtension, Irp, LockStatus, &SourceDeviceName, &SourceSymbolicName, &TargetVolumeName);
/* Pending means DB are under synchronization, bail out */
if (Status == STATUS_PENDING)
{
FreePool(LinkTarget.Buffer);
FreePool(SourceDeviceName.Buffer);
FreePool(SourceSymbolicName.Buffer);
return STATUS_SUCCESS;
}
else if (!NT_SUCCESS(Status))
{
FreePool(LinkTarget.Buffer);
return Status;
}
/* Query the device information */
Status = FindDeviceInfo(DeviceExtension, &SourceDeviceName, FALSE, &DeviceInformation);
if (!NT_SUCCESS(Status))
{
/* If it failed, first try to get volume name */
Status = QueryVolumeName(0, NULL, &SourceDeviceName, &LinkTarget, &VolumeName);
if (!NT_SUCCESS(Status))
{
/* Then, try to read the symlink */
Status = MountMgrQuerySymbolicLink(&SourceDeviceName, &LinkTarget);
if (!NT_SUCCESS(Status))
{
FreePool(LinkTarget.Buffer);
FreePool(SourceDeviceName.Buffer);
FreePool(SourceSymbolicName.Buffer);
return Status;
}
}
else
{
FreePool(VolumeName.Buffer);
}
FreePool(SourceDeviceName.Buffer);
SourceDeviceName.Length = LinkTarget.Length;
SourceDeviceName.MaximumLength = LinkTarget.MaximumLength;
SourceDeviceName.Buffer = LinkTarget.Buffer;
/* Now that we have the correct source, reattempt to query information */
Status = FindDeviceInfo(DeviceExtension, &SourceDeviceName, FALSE, &DeviceInformation);
if (!NT_SUCCESS(Status))
{
FreePool(SourceDeviceName.Buffer);
FreePool(SourceSymbolicName.Buffer);
return Status;
}
}
FreePool(SourceDeviceName.Buffer);
/* Get information about target device */
Status = FindDeviceInfo(DeviceExtension, &TargetVolumeName, FALSE, &TargetDeviceInformation);
if (!NT_SUCCESS(Status))
{
FreePool(SourceSymbolicName.Buffer);
return Status;
}
/* Open the remote database */
RemoteDatabase = OpenRemoteDatabase(DeviceInformation, TRUE);
if (RemoteDatabase == 0)
{
FreePool(SourceSymbolicName.Buffer);
return STATUS_INSUFFICIENT_RESOURCES;
}
/* Browse all the entries */
Offset = 0;
for (;;)
{
DatabaseEntry = GetRemoteDatabaseEntry(RemoteDatabase, Offset);
if (DatabaseEntry == NULL)
{
/* We didn't find ourselves, that's infortunate! */
FreePool(SourceSymbolicName.Buffer);
CloseRemoteDatabase(RemoteDatabase);
return STATUS_INVALID_PARAMETER;
}
/* Try to find ourselves */
DbName.MaximumLength = DatabaseEntry->SymbolicNameLength;
DbName.Length = DbName.MaximumLength;
DbName.Buffer = (PWSTR)((ULONG_PTR)DatabaseEntry + DatabaseEntry->SymbolicNameOffset);
if (RtlEqualUnicodeString(&TargetVolumeName, &DbName, TRUE))
{
break;
}
Offset += DatabaseEntry->EntrySize;
FreePool(DatabaseEntry);
}
/* Dereference ourselves */
DatabaseEntry->EntryReferences--;
if (DatabaseEntry->EntryReferences == 0)
{
/* If we're still referenced, just update the entry */
Status = WriteRemoteDatabaseEntry(RemoteDatabase, Offset, DatabaseEntry);
}
else
{
/* Otherwise, delete the entry */
Status = DeleteRemoteDatabaseEntry(RemoteDatabase, Offset);
if (!NT_SUCCESS(Status))
{
FreePool(DatabaseEntry);
FreePool(SourceSymbolicName.Buffer);
CloseRemoteDatabase(RemoteDatabase);
return Status;
}
/* Also, delete our unique ID replicated record */
for (Entry = DeviceInformation->ReplicatedUniqueIdsListHead.Flink;
Entry != &DeviceInformation->ReplicatedUniqueIdsListHead;
Entry = Entry->Flink)
{
UniqueIdReplicate = CONTAINING_RECORD(Entry, UNIQUE_ID_REPLICATE, ReplicatedUniqueIdsListEntry);
if (UniqueIdReplicate->UniqueId->UniqueIdLength == DatabaseEntry->UniqueIdLength &&
RtlCompareMemory(UniqueIdReplicate->UniqueId->UniqueId,
(PVOID)((ULONG_PTR)DatabaseEntry + DatabaseEntry->UniqueIdOffset),
DatabaseEntry->UniqueIdLength) == DatabaseEntry->UniqueIdLength)
{
break;
}
}
/* It has to exist! */
if (Entry == &DeviceInformation->ReplicatedUniqueIdsListHead)
{
FreePool(DatabaseEntry);
FreePool(SourceSymbolicName.Buffer);
CloseRemoteDatabase(RemoteDatabase);
return STATUS_UNSUCCESSFUL;
}
/* Remove it and free it */
RemoveEntryList(&UniqueIdReplicate->ReplicatedUniqueIdsListEntry);
FreePool(UniqueIdReplicate->UniqueId);
FreePool(UniqueIdReplicate);
}
/* We're done with the remote database */
FreePool(DatabaseEntry);
CloseRemoteDatabase(RemoteDatabase);
/* Check write operation succeed */
if (!NT_SUCCESS(Status))
{
FreePool(SourceSymbolicName.Buffer);
return Status;
}
/* Try to find our associated device entry */
for (Entry = TargetDeviceInformation->AssociatedDevicesHead.Flink;
Entry != &TargetDeviceInformation->AssociatedDevicesHead;
Entry = Entry->Flink)
{
AssociatedEntry = CONTAINING_RECORD(Entry, ASSOCIATED_DEVICE_ENTRY, AssociatedDevicesEntry);
/* If found, delete it */
if (AssociatedEntry->DeviceInformation == DeviceInformation &&
RtlEqualUnicodeString(&AssociatedEntry->String, &SourceSymbolicName, TRUE))
{
RemoveEntryList(&AssociatedEntry->AssociatedDevicesEntry);
FreePool(AssociatedEntry->String.Buffer);
FreePool(AssociatedEntry);
break;
}
}
/* We're done! */
FreePool(SourceSymbolicName.Buffer);
return STATUS_SUCCESS;
}
/*
* @implemented
*/
NTSTATUS
NTAPI
MountMgrDeviceControl(IN PDEVICE_OBJECT DeviceObject,
IN PIRP Irp)
{
PIO_STACK_LOCATION Stack;
NTSTATUS Status, LockStatus;
PDEVICE_EXTENSION DeviceExtension;
Stack = IoGetCurrentIrpStackLocation(Irp);
DeviceExtension = DeviceObject->DeviceExtension;
KeWaitForSingleObject(&(DeviceExtension->DeviceLock), Executive, KernelMode, FALSE, NULL);
switch (Stack->Parameters.DeviceIoControl.IoControlCode)
{
case IOCTL_MOUNTMGR_CREATE_POINT:
Status = MountMgrCreatePoint(DeviceExtension, Irp);
break;
case IOCTL_MOUNTMGR_DELETE_POINTS:
Status = MountMgrDeletePoints(DeviceExtension, Irp);
break;
case IOCTL_MOUNTMGR_QUERY_POINTS:
Status = MountMgrQueryPoints(DeviceExtension, Irp);
break;
case IOCTL_MOUNTMGR_DELETE_POINTS_DBONLY:
Status = MountMgrDeletePointsDbOnly(DeviceExtension, Irp);
break;
case IOCTL_MOUNTMGR_NEXT_DRIVE_LETTER:
Status = MountMgrNextDriveLetter(DeviceExtension, Irp);
break;
case IOCTL_MOUNTMGR_AUTO_DL_ASSIGNMENTS:
DeviceExtension->AutomaticDriveLetter = TRUE;
Status = STATUS_SUCCESS;
MountMgrAssignDriveLetters(DeviceExtension);
ReconcileAllDatabasesWithMaster(DeviceExtension);
WaitForOnlinesToComplete(DeviceExtension);
break;
case IOCTL_MOUNTMGR_VOLUME_MOUNT_POINT_CREATED:
KeReleaseSemaphore(&(DeviceExtension->DeviceLock), IO_NO_INCREMENT, 1, FALSE);
LockStatus = WaitForRemoteDatabaseSemaphore(DeviceExtension);
KeWaitForSingleObject(&(DeviceExtension->DeviceLock), Executive, KernelMode, FALSE, NULL);
Status = MountMgrVolumeMountPointCreated(DeviceExtension, Irp, LockStatus);
if (NT_SUCCESS(LockStatus))
{
ReleaseRemoteDatabaseSemaphore(DeviceExtension);
}
break;
case IOCTL_MOUNTMGR_VOLUME_MOUNT_POINT_DELETED:
KeReleaseSemaphore(&(DeviceExtension->DeviceLock), IO_NO_INCREMENT, 1, FALSE);
LockStatus = WaitForRemoteDatabaseSemaphore(DeviceExtension);
KeWaitForSingleObject(&(DeviceExtension->DeviceLock), Executive, KernelMode, FALSE, NULL);
Status = MountMgrVolumeMountPointDeleted(DeviceExtension, Irp, LockStatus);
if (NT_SUCCESS(LockStatus))
{
ReleaseRemoteDatabaseSemaphore(DeviceExtension);
}
break;
case IOCTL_MOUNTMGR_CHANGE_NOTIFY:
Status = MountMgrChangeNotify(DeviceExtension, Irp);
break;
case IOCTL_MOUNTMGR_KEEP_LINKS_WHEN_OFFLINE:
Status = MountMgrKeepLinksWhenOffline(DeviceExtension, Irp);
break;
case IOCTL_MOUNTMGR_CHECK_UNPROCESSED_VOLUMES:
Status = MountMgrCheckUnprocessedVolumes(DeviceExtension, Irp);
goto Complete;
case IOCTL_MOUNTMGR_VOLUME_ARRIVAL_NOTIFICATION:
KeReleaseSemaphore(&(DeviceExtension->DeviceLock), IO_NO_INCREMENT, 1, FALSE);
Status = MountMgrVolumeArrivalNotification(DeviceExtension, Irp);
goto Complete;
case IOCTL_MOUNTMGR_QUERY_DOS_VOLUME_PATH:
Status = MountMgrQueryDosVolumePath(DeviceExtension, Irp);
break;
case IOCTL_MOUNTMGR_QUERY_DOS_VOLUME_PATHS:
Status = MountMgrQueryDosVolumePaths(DeviceExtension, Irp);
break;
case IOCTL_MOUNTMGR_SCRUB_REGISTRY:
Status = MountMgrScrubRegistry(DeviceExtension);
break;
case IOCTL_MOUNTMGR_QUERY_AUTO_MOUNT:
Status = MountMgrQueryAutoMount(DeviceExtension, Irp);
break;
case IOCTL_MOUNTMGR_SET_AUTO_MOUNT:
Status = MountMgrSetAutoMount(DeviceExtension, Irp);
break;
case IOCTL_MOUNTMGR_DEFINE_UNIX_DRIVE:
case IOCTL_MOUNTMGR_QUERY_UNIX_DRIVE:
DPRINT1("Winism! Rewrite the caller!\n");
default:
Status = STATUS_INVALID_DEVICE_REQUEST;
}
KeReleaseSemaphore(&(DeviceExtension->DeviceLock), IO_NO_INCREMENT, 1, FALSE);
if (Status != STATUS_PENDING)
{
goto Complete;
}
return Status;
Complete:
Irp->IoStatus.Status = Status;
IoCompleteRequest(Irp, IO_NO_INCREMENT);
return Status;
}
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