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device.c
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/**
* @file sys/device.c
*
* @copyright 2015-2020 Bill Zissimopoulos
*/
/*
* This file is part of WinFsp.
*
* You can redistribute it and/or modify it under the terms of the GNU
* General Public License version 3 as published by the Free Software
* Foundation.
*
* Licensees holding a valid commercial license may use this software
* in accordance with the commercial license agreement provided in
* conjunction with the software. The terms and conditions of any such
* commercial license agreement shall govern, supersede, and render
* ineffective any application of the GPLv3 license to this software,
* notwithstanding of any reference thereto in the software or
* associated repository.
*/
#include <sys/driver.h>
NTSTATUS FspDeviceCreateSecure(UINT32 Kind, ULONG ExtraSize,
PUNICODE_STRING DeviceName, DEVICE_TYPE DeviceType, ULONG DeviceCharacteristics,
PUNICODE_STRING DeviceSddl, LPCGUID DeviceClassGuid,
PDEVICE_OBJECT *PDeviceObject);
NTSTATUS FspDeviceCreate(UINT32 Kind, ULONG ExtraSize,
DEVICE_TYPE DeviceType, ULONG DeviceCharacteristics,
PDEVICE_OBJECT *PDeviceObject);
NTSTATUS FspDeviceInitialize(PDEVICE_OBJECT DeviceObject);
VOID FspDeviceDelete(PDEVICE_OBJECT DeviceObject);
BOOLEAN FspDeviceReference(PDEVICE_OBJECT DeviceObject);
VOID FspDeviceDereference(PDEVICE_OBJECT DeviceObject);
_IRQL_requires_(DISPATCH_LEVEL)
static BOOLEAN FspDeviceReferenceAtDpcLevel(PDEVICE_OBJECT DeviceObject);
_IRQL_requires_(DISPATCH_LEVEL)
static VOID FspDeviceDereferenceFromDpcLevel(PDEVICE_OBJECT DeviceObject);
static NTSTATUS FspFsvolDeviceInit(PDEVICE_OBJECT DeviceObject);
static VOID FspFsvolDeviceFini(PDEVICE_OBJECT DeviceObject);
static IO_TIMER_ROUTINE FspFsvolDeviceTimerRoutine;
static WORKER_THREAD_ROUTINE FspFsvolDeviceExpirationRoutine;
VOID FspFsvolDeviceFileRenameAcquireShared(PDEVICE_OBJECT DeviceObject);
BOOLEAN FspFsvolDeviceFileRenameTryAcquireShared(PDEVICE_OBJECT DeviceObject);
VOID FspFsvolDeviceFileRenameAcquireExclusive(PDEVICE_OBJECT DeviceObject);
BOOLEAN FspFsvolDeviceFileRenameTryAcquireExclusive(PDEVICE_OBJECT DeviceObject);
VOID FspFsvolDeviceFileRenameSetOwner(PDEVICE_OBJECT DeviceObject, PVOID Owner);
VOID FspFsvolDeviceFileRenameRelease(PDEVICE_OBJECT DeviceObject);
VOID FspFsvolDeviceFileRenameReleaseOwner(PDEVICE_OBJECT DeviceObject, PVOID Owner);
BOOLEAN FspFsvolDeviceFileRenameIsAcquiredExclusive(PDEVICE_OBJECT DeviceObject);
VOID FspFsvolDeviceLockContextTable(PDEVICE_OBJECT DeviceObject);
VOID FspFsvolDeviceUnlockContextTable(PDEVICE_OBJECT DeviceObject);
NTSTATUS FspFsvolDeviceCopyContextList(PDEVICE_OBJECT DeviceObject,
PVOID **PContexts, PULONG PContextCount);
NTSTATUS FspFsvolDeviceCopyContextByNameList(PDEVICE_OBJECT DeviceObject,
PVOID **PContexts, PULONG PContextCount);
VOID FspFsvolDeviceDeleteContextList(PVOID *Contexts, ULONG ContextCount);
PVOID FspFsvolDeviceEnumerateContextByName(PDEVICE_OBJECT DeviceObject, PUNICODE_STRING FileName,
BOOLEAN NextFlag, FSP_DEVICE_CONTEXT_BY_NAME_TABLE_RESTART_KEY *RestartKey);
PVOID FspFsvolDeviceLookupContextByName(PDEVICE_OBJECT DeviceObject, PUNICODE_STRING FileName);
PVOID FspFsvolDeviceInsertContextByName(PDEVICE_OBJECT DeviceObject, PUNICODE_STRING FileName, PVOID Context,
FSP_DEVICE_CONTEXT_BY_NAME_TABLE_ELEMENT *ElementStorage, PBOOLEAN PInserted);
VOID FspFsvolDeviceDeleteContextByName(PDEVICE_OBJECT DeviceObject, PUNICODE_STRING FileName,
PBOOLEAN PDeleted);
static RTL_AVL_COMPARE_ROUTINE FspFsvolDeviceCompareContextByName;
static RTL_AVL_ALLOCATE_ROUTINE FspFsvolDeviceAllocateContextByName;
static RTL_AVL_FREE_ROUTINE FspFsvolDeviceFreeContextByName;
VOID FspFsvolDeviceGetVolumeInfo(PDEVICE_OBJECT DeviceObject, FSP_FSCTL_VOLUME_INFO *VolumeInfo);
BOOLEAN FspFsvolDeviceTryGetVolumeInfo(PDEVICE_OBJECT DeviceObject, FSP_FSCTL_VOLUME_INFO *VolumeInfo);
VOID FspFsvolDeviceSetVolumeInfo(PDEVICE_OBJECT DeviceObject, const FSP_FSCTL_VOLUME_INFO *VolumeInfo);
VOID FspFsvolDeviceInvalidateVolumeInfo(PDEVICE_OBJECT DeviceObject);
static NTSTATUS FspFsmupDeviceInit(PDEVICE_OBJECT DeviceObject);
static VOID FspFsmupDeviceFini(PDEVICE_OBJECT DeviceObject);
NTSTATUS FspDeviceCopyList(
PDEVICE_OBJECT **PDeviceObjects, PULONG PDeviceObjectCount);
VOID FspDeviceDeleteList(
PDEVICE_OBJECT *DeviceObjects, ULONG DeviceObjectCount);
VOID FspDeviceDeleteAll(VOID);
#ifdef ALLOC_PRAGMA
#pragma alloc_text(PAGE, FspDeviceCreateSecure)
#pragma alloc_text(PAGE, FspDeviceCreate)
#pragma alloc_text(PAGE, FspDeviceInitialize)
#pragma alloc_text(PAGE, FspDeviceDelete)
#pragma alloc_text(PAGE, FspFsvolDeviceInit)
#pragma alloc_text(PAGE, FspFsvolDeviceFini)
#pragma alloc_text(PAGE, FspFsvolDeviceFileRenameAcquireShared)
#pragma alloc_text(PAGE, FspFsvolDeviceFileRenameTryAcquireShared)
#pragma alloc_text(PAGE, FspFsvolDeviceFileRenameAcquireExclusive)
#pragma alloc_text(PAGE, FspFsvolDeviceFileRenameTryAcquireExclusive)
#pragma alloc_text(PAGE, FspFsvolDeviceFileRenameSetOwner)
#pragma alloc_text(PAGE, FspFsvolDeviceFileRenameRelease)
#pragma alloc_text(PAGE, FspFsvolDeviceFileRenameReleaseOwner)
#pragma alloc_text(PAGE, FspFsvolDeviceFileRenameIsAcquiredExclusive)
#pragma alloc_text(PAGE, FspFsvolDeviceLockContextTable)
#pragma alloc_text(PAGE, FspFsvolDeviceUnlockContextTable)
#pragma alloc_text(PAGE, FspFsvolDeviceCopyContextList)
#pragma alloc_text(PAGE, FspFsvolDeviceCopyContextByNameList)
#pragma alloc_text(PAGE, FspFsvolDeviceDeleteContextList)
#pragma alloc_text(PAGE, FspFsvolDeviceEnumerateContextByName)
#pragma alloc_text(PAGE, FspFsvolDeviceLookupContextByName)
#pragma alloc_text(PAGE, FspFsvolDeviceInsertContextByName)
#pragma alloc_text(PAGE, FspFsvolDeviceDeleteContextByName)
#pragma alloc_text(PAGE, FspFsvolDeviceCompareContextByName)
#pragma alloc_text(PAGE, FspFsvolDeviceAllocateContextByName)
#pragma alloc_text(PAGE, FspFsvolDeviceFreeContextByName)
#pragma alloc_text(PAGE, FspFsmupDeviceInit)
#pragma alloc_text(PAGE, FspFsmupDeviceFini)
#pragma alloc_text(PAGE, FspDeviceCopyList)
#pragma alloc_text(PAGE, FspDeviceDeleteList)
#pragma alloc_text(PAGE, FspDeviceDeleteAll)
#endif
NTSTATUS FspDeviceCreateSecure(UINT32 Kind, ULONG ExtraSize,
PUNICODE_STRING DeviceName, DEVICE_TYPE DeviceType, ULONG DeviceCharacteristics,
PUNICODE_STRING DeviceSddl, LPCGUID DeviceClassGuid,
PDEVICE_OBJECT *PDeviceObject)
{
PAGED_CODE();
NTSTATUS Result;
ULONG DeviceExtensionSize;
PDEVICE_OBJECT DeviceObject;
FSP_DEVICE_EXTENSION *DeviceExtension;
*PDeviceObject = 0;
switch (Kind)
{
case FspFsvolDeviceExtensionKind:
DeviceExtensionSize = sizeof(FSP_FSVOL_DEVICE_EXTENSION);
break;
case FspFsvrtDeviceExtensionKind:
DeviceExtensionSize = sizeof(FSP_FSVRT_DEVICE_EXTENSION);
break;
case FspFsmupDeviceExtensionKind:
DeviceExtensionSize = sizeof(FSP_FSMUP_DEVICE_EXTENSION);
break;
case FspFsctlDeviceExtensionKind:
DeviceExtensionSize = sizeof(FSP_DEVICE_EXTENSION);
break;
default:
ASSERT(0);
return STATUS_INVALID_PARAMETER;
}
if (0 != DeviceSddl)
Result = IoCreateDeviceSecure(FspDriverObject,
DeviceExtensionSize + ExtraSize, DeviceName, DeviceType,
DeviceCharacteristics, FALSE,
DeviceSddl, DeviceClassGuid,
&DeviceObject);
else
Result = IoCreateDevice(FspDriverObject,
DeviceExtensionSize + ExtraSize, DeviceName, DeviceType,
DeviceCharacteristics, FALSE,
&DeviceObject);
if (!NT_SUCCESS(Result))
return Result;
DeviceExtension = FspDeviceExtension(DeviceObject);
KeInitializeSpinLock(&DeviceExtension->SpinLock);
DeviceExtension->RefCount = 1;
DeviceExtension->Kind = Kind;
*PDeviceObject = DeviceObject;
return Result;
}
NTSTATUS FspDeviceCreate(UINT32 Kind, ULONG ExtraSize,
DEVICE_TYPE DeviceType, ULONG DeviceCharacteristics,
PDEVICE_OBJECT *PDeviceObject)
{
PAGED_CODE();
return FspDeviceCreateSecure(Kind, ExtraSize, 0, DeviceType, DeviceCharacteristics,
0, 0, PDeviceObject);
}
NTSTATUS FspDeviceInitialize(PDEVICE_OBJECT DeviceObject)
{
PAGED_CODE();
NTSTATUS Result;
FSP_DEVICE_EXTENSION *DeviceExtension = FspDeviceExtension(DeviceObject);
switch (DeviceExtension->Kind)
{
case FspFsvolDeviceExtensionKind:
Result = FspFsvolDeviceInit(DeviceObject);
break;
case FspFsvrtDeviceExtensionKind:
Result = STATUS_SUCCESS;
break;
case FspFsmupDeviceExtensionKind:
Result = FspFsmupDeviceInit(DeviceObject);
break;
case FspFsctlDeviceExtensionKind:
Result = STATUS_SUCCESS;
break;
default:
ASSERT(0);
return STATUS_INVALID_PARAMETER;
}
if (NT_SUCCESS(Result))
ClearFlag(DeviceObject->Flags, DO_DEVICE_INITIALIZING);
return Result;
}
VOID FspDeviceDelete(PDEVICE_OBJECT DeviceObject)
{
PAGED_CODE();
FSP_DEVICE_EXTENSION *DeviceExtension = FspDeviceExtension(DeviceObject);
switch (DeviceExtension->Kind)
{
case FspFsvolDeviceExtensionKind:
FspFsvolDeviceFini(DeviceObject);
break;
case FspFsvrtDeviceExtensionKind:
break;
case FspFsmupDeviceExtensionKind:
FspFsmupDeviceFini(DeviceObject);
break;
case FspFsctlDeviceExtensionKind:
break;
default:
ASSERT(0);
return;
}
#if DBG
#pragma prefast(suppress:28175, "Debugging only: ok to access DeviceObject->Size")
RtlFillMemory(&DeviceExtension->Kind,
(PUINT8)DeviceObject + DeviceObject->Size - (PUINT8)&DeviceExtension->Kind, 0xBD);
#endif
IoDeleteDevice(DeviceObject);
}
BOOLEAN FspDeviceReference(PDEVICE_OBJECT DeviceObject)
{
// !PAGED_CODE();
BOOLEAN Result;
FSP_DEVICE_EXTENSION *DeviceExtension;
KIRQL Irql;
DeviceExtension = FspDeviceExtension(DeviceObject);
KeAcquireSpinLock(&DeviceExtension->SpinLock, &Irql);
Result = 0 != DeviceExtension->RefCount;
if (Result)
DeviceExtension->RefCount++;
KeReleaseSpinLock(&DeviceExtension->SpinLock, Irql);
return Result;
}
VOID FspDeviceDereference(PDEVICE_OBJECT DeviceObject)
{
// !PAGED_CODE();
BOOLEAN Delete = FALSE;
FSP_DEVICE_EXTENSION *DeviceExtension;
KIRQL Irql;
DeviceExtension = FspDeviceExtension(DeviceObject);
KeAcquireSpinLock(&DeviceExtension->SpinLock, &Irql);
if (0 != DeviceExtension->RefCount)
{
DeviceExtension->RefCount--;
Delete = 0 == DeviceExtension->RefCount;
}
KeReleaseSpinLock(&DeviceExtension->SpinLock, Irql);
if (Delete)
FspDeviceDelete(DeviceObject);
}
_IRQL_requires_(DISPATCH_LEVEL)
static BOOLEAN FspDeviceReferenceAtDpcLevel(PDEVICE_OBJECT DeviceObject)
{
// !PAGED_CODE();
BOOLEAN Result;
FSP_DEVICE_EXTENSION *DeviceExtension;
DeviceExtension = FspDeviceExtension(DeviceObject);
KeAcquireSpinLockAtDpcLevel(&DeviceExtension->SpinLock);
Result = 0 != DeviceExtension->RefCount;
if (Result)
DeviceExtension->RefCount++;
KeReleaseSpinLockFromDpcLevel(&DeviceExtension->SpinLock);
return Result;
}
_IRQL_requires_(DISPATCH_LEVEL)
static VOID FspDeviceDereferenceFromDpcLevel(PDEVICE_OBJECT DeviceObject)
{
// !PAGED_CODE();
BOOLEAN Delete = FALSE;
FSP_DEVICE_EXTENSION *DeviceExtension;
DeviceExtension = FspDeviceExtension(DeviceObject);
KeAcquireSpinLockAtDpcLevel(&DeviceExtension->SpinLock);
if (0 != DeviceExtension->RefCount)
{
DeviceExtension->RefCount--;
Delete = 0 == DeviceExtension->RefCount;
}
KeReleaseSpinLockFromDpcLevel(&DeviceExtension->SpinLock);
ASSERT(!Delete);
}
static NTSTATUS FspFsvolDeviceInit(PDEVICE_OBJECT DeviceObject)
{
PAGED_CODE();
NTSTATUS Result;
FSP_FSVOL_DEVICE_EXTENSION *FsvolDeviceExtension = FspFsvolDeviceExtension(DeviceObject);
LARGE_INTEGER IrpTimeout;
LARGE_INTEGER SecurityTimeout, DirInfoTimeout, StreamInfoTimeout, EaTimeout;
/*
* Volume device initialization is a mess, because of the different ways of
* creating/initializing different resources. So we will use some bits just
* to track what has been initialized!
*/
/* initialize any fsext provider */
if (0 != FsvolDeviceExtension->VolumeParams.FsextControlCode)
{
FSP_FSEXT_PROVIDER *Provider = FspFsextProvider(
FsvolDeviceExtension->VolumeParams.FsextControlCode, 0);
if (0 != Provider)
{
Result = Provider->DeviceInit(DeviceObject, &FsvolDeviceExtension->VolumeParams);
if (!NT_SUCCESS(Result))
return Result;
FsvolDeviceExtension->Provider = Provider;
FsvolDeviceExtension->InitDoneFsext = 1;
}
else
return STATUS_OBJECT_NAME_NOT_FOUND;
}
/* is there a virtual disk? */
if (0 != FsvolDeviceExtension->FsvrtDeviceObject)
{
/* allocate a spare VPB so that we can be mounted on the virtual disk */
FsvolDeviceExtension->SwapVpb = FspAllocNonPagedExternal(sizeof *FsvolDeviceExtension->SwapVpb);
if (0 == FsvolDeviceExtension->SwapVpb)
return STATUS_INSUFFICIENT_RESOURCES;
RtlZeroMemory(FsvolDeviceExtension->SwapVpb, sizeof *FsvolDeviceExtension->SwapVpb);
/* reference the virtual disk device so that it will not go away while we are using it */
ObReferenceObject(FsvolDeviceExtension->FsvrtDeviceObject);
FsvolDeviceExtension->InitDoneFsvrt = 1;
}
/* create our Ioq */
IrpTimeout.QuadPart = FsvolDeviceExtension->VolumeParams.IrpTimeout * 10000ULL;
/* convert millis to nanos */
Result = FspIoqCreate(
FsvolDeviceExtension->VolumeParams.IrpCapacity, &IrpTimeout, FspIopCompleteCanceledIrp,
&FsvolDeviceExtension->Ioq);
if (!NT_SUCCESS(Result))
return Result;
FsvolDeviceExtension->InitDoneIoq = 1;
/* create our security meta cache */
SecurityTimeout.QuadPart = FspTimeoutFromMillis(FsvolDeviceExtension->VolumeParams.SecurityTimeout);
/* convert millis to nanos */
Result = FspMetaCacheCreate(
FspFsvolDeviceSecurityCacheCapacity, FspFsvolDeviceSecurityCacheItemSizeMax, &SecurityTimeout,
&FsvolDeviceExtension->SecurityCache);
if (!NT_SUCCESS(Result))
return Result;
FsvolDeviceExtension->InitDoneSec = 1;
/* create our directory meta cache */
DirInfoTimeout.QuadPart = FspTimeoutFromMillis(FsvolDeviceExtension->VolumeParams.DirInfoTimeout);
/* convert millis to nanos */
Result = FspMetaCacheCreate(
FspFsvolDeviceDirInfoCacheCapacity, FspFsvolDeviceDirInfoCacheItemSizeMax, &DirInfoTimeout,
&FsvolDeviceExtension->DirInfoCache);
if (!NT_SUCCESS(Result))
return Result;
FsvolDeviceExtension->InitDoneDir = 1;
/* create our stream info meta cache */
StreamInfoTimeout.QuadPart = FspTimeoutFromMillis(FsvolDeviceExtension->VolumeParams.StreamInfoTimeout);
/* convert millis to nanos */
Result = FspMetaCacheCreate(
FspFsvolDeviceStreamInfoCacheCapacity, FspFsvolDeviceStreamInfoCacheItemSizeMax, &StreamInfoTimeout,
&FsvolDeviceExtension->StreamInfoCache);
if (!NT_SUCCESS(Result))
return Result;
FsvolDeviceExtension->InitDoneStrm = 1;
/* create our EA meta cache */
EaTimeout.QuadPart = FspTimeoutFromMillis(FsvolDeviceExtension->VolumeParams.EaTimeout);
/* convert millis to nanos */
Result = FspMetaCacheCreate(
FspFsvolDeviceEaCacheCapacity, FspFsvolDeviceEaCacheItemSizeMax, &EaTimeout,
&FsvolDeviceExtension->EaCache);
if (!NT_SUCCESS(Result))
return Result;
FsvolDeviceExtension->InitDoneEa = 1;
/* initialize the Volume Notify and FSRTL Notify mechanisms */
Result = FspNotifyInitializeSync(&FsvolDeviceExtension->NotifySync);
if (!NT_SUCCESS(Result))
return Result;
FspWgroupInitialize(&FsvolDeviceExtension->VolumeNotifyWgroup);
InitializeListHead(&FsvolDeviceExtension->NotifyList);
FsvolDeviceExtension->InitDoneNotify = 1;
/* create file system statistics */
Result = FspStatisticsCreate(&FsvolDeviceExtension->Statistics);
if (!NT_SUCCESS(Result))
return Result;
FsvolDeviceExtension->InitDoneStat = 1;
/* initialize our context table */
ExInitializeResourceLite(&FsvolDeviceExtension->FileRenameResource);
ExInitializeResourceLite(&FsvolDeviceExtension->ContextTableResource);
InitializeListHead(&FsvolDeviceExtension->ContextList);
RtlInitializeGenericTableAvl(&FsvolDeviceExtension->ContextByNameTable,
FspFsvolDeviceCompareContextByName,
FspFsvolDeviceAllocateContextByName,
FspFsvolDeviceFreeContextByName,
0);
FsvolDeviceExtension->InitDoneCtxTab = 1;
/* initialize our timer routine and start our expiration timer */
#pragma prefast(suppress:28133, "We are a filesystem: we do not have AddDevice")
Result = IoInitializeTimer(DeviceObject, FspFsvolDeviceTimerRoutine, 0);
if (!NT_SUCCESS(Result))
return Result;
KeInitializeSpinLock(&FsvolDeviceExtension->ExpirationLock);
ExInitializeWorkItem(&FsvolDeviceExtension->ExpirationWorkItem,
FspFsvolDeviceExpirationRoutine, DeviceObject);
IoStartTimer(DeviceObject);
FsvolDeviceExtension->InitDoneTimer = 1;
/* initialize the volume information */
KeInitializeSpinLock(&FsvolDeviceExtension->InfoSpinLock);
FsvolDeviceExtension->InitDoneInfo = 1;
return STATUS_SUCCESS;
}
static VOID FspFsvolDeviceFini(PDEVICE_OBJECT DeviceObject)
{
PAGED_CODE();
FSP_FSVOL_DEVICE_EXTENSION *FsvolDeviceExtension = FspFsvolDeviceExtension(DeviceObject);
/*
* First things first: stop our timer.
*
* Our IoTimer routine will NOT be called again after IoStopTimer() returns.
* However a work item may be in flight. For this reason our IoTimer routine
* references our DeviceObject before queueing work items.
*/
if (FsvolDeviceExtension->InitDoneTimer)
IoStopTimer(DeviceObject);
/* delete the file system statistics */
if (FsvolDeviceExtension->InitDoneStat)
FspStatisticsDelete(FsvolDeviceExtension->Statistics);
/* uninitialize the Volume Notify and FSRTL Notify mechanisms */
if (FsvolDeviceExtension->InitDoneNotify)
{
FspNotifyCleanupAll(
FsvolDeviceExtension->NotifySync, &FsvolDeviceExtension->NotifyList);
FspNotifyUninitializeSync(&FsvolDeviceExtension->NotifySync);
}
/* delete the EA meta cache */
if (FsvolDeviceExtension->InitDoneEa)
FspMetaCacheDelete(FsvolDeviceExtension->EaCache);
/* delete the stream info meta cache */
if (FsvolDeviceExtension->InitDoneStrm)
FspMetaCacheDelete(FsvolDeviceExtension->StreamInfoCache);
/* delete the directory meta cache */
if (FsvolDeviceExtension->InitDoneDir)
FspMetaCacheDelete(FsvolDeviceExtension->DirInfoCache);
/* delete the security meta cache */
if (FsvolDeviceExtension->InitDoneSec)
FspMetaCacheDelete(FsvolDeviceExtension->SecurityCache);
/* delete the Ioq */
if (FsvolDeviceExtension->InitDoneIoq)
FspIoqDelete(FsvolDeviceExtension->Ioq);
if (FsvolDeviceExtension->InitDoneCtxTab)
{
/*
* FspDeviceFreeContext/FspDeviceFreeContextByName is a no-op, so it is not necessary
* to enumerate and delete all entries in the ContextTable.
*/
ExDeleteResourceLite(&FsvolDeviceExtension->ContextTableResource);
ExDeleteResourceLite(&FsvolDeviceExtension->FileRenameResource);
}
/* is there a virtual disk? */
if (FsvolDeviceExtension->InitDoneFsvrt)
{
/* dereference the virtual volume device so that it can now go away */
ObDereferenceObject(FsvolDeviceExtension->FsvrtDeviceObject);
/* free the spare VPB if we still have it */
if (0 != FsvolDeviceExtension->SwapVpb)
FspFreeExternal(FsvolDeviceExtension->SwapVpb);
}
/* finalize any fsext provider */
if (FsvolDeviceExtension->InitDoneFsext)
{
if (0 != FsvolDeviceExtension->Provider)
FsvolDeviceExtension->Provider->DeviceFini(DeviceObject);
}
}
static VOID FspFsvolDeviceTimerRoutine(PDEVICE_OBJECT DeviceObject, PVOID Context)
{
// !PAGED_CODE();
/*
* This routine runs at DPC level. Reference our DeviceObject and queue a work item
* so that we can do our processing at Passive level. Only do so if the work item
* is not already in flight (otherwise we could requeue the same work item).
*/
ASSERT(KeGetCurrentIrql() == DISPATCH_LEVEL);
if (!FspDeviceReferenceAtDpcLevel(DeviceObject))
return;
BOOLEAN ExpirationInProgress;
FSP_FSVOL_DEVICE_EXTENSION *FsvolDeviceExtension = FspFsvolDeviceExtension(DeviceObject);
KeAcquireSpinLockAtDpcLevel(&FsvolDeviceExtension->ExpirationLock);
ExpirationInProgress = FsvolDeviceExtension->ExpirationInProgress;
if (!ExpirationInProgress)
{
FsvolDeviceExtension->ExpirationInProgress = TRUE;
ExQueueWorkItem(&FsvolDeviceExtension->ExpirationWorkItem, DelayedWorkQueue);
}
KeReleaseSpinLockFromDpcLevel(&FsvolDeviceExtension->ExpirationLock);
if (ExpirationInProgress)
FspDeviceDereferenceFromDpcLevel(DeviceObject);
}
static VOID FspFsvolDeviceExpirationRoutine(PVOID Context)
{
// !PAGED_CODE();
PDEVICE_OBJECT DeviceObject = Context;
FSP_FSVOL_DEVICE_EXTENSION *FsvolDeviceExtension = FspFsvolDeviceExtension(DeviceObject);
UINT64 InterruptTime;
KIRQL Irql;
InterruptTime = KeQueryInterruptTime();
FspMetaCacheInvalidateExpired(FsvolDeviceExtension->SecurityCache, InterruptTime);
FspMetaCacheInvalidateExpired(FsvolDeviceExtension->DirInfoCache, InterruptTime);
FspMetaCacheInvalidateExpired(FsvolDeviceExtension->StreamInfoCache, InterruptTime);
/* run any fsext provider expiration routine */
if (0 != FsvolDeviceExtension->Provider)
FsvolDeviceExtension->Provider->DeviceExpirationRoutine(DeviceObject, InterruptTime);
FspIoqRemoveExpired(FsvolDeviceExtension->Ioq, InterruptTime);
KeAcquireSpinLock(&FsvolDeviceExtension->ExpirationLock, &Irql);
FsvolDeviceExtension->ExpirationInProgress = FALSE;
KeReleaseSpinLock(&FsvolDeviceExtension->ExpirationLock, Irql);
FspDeviceDereference(DeviceObject);
}
VOID FspFsvolDeviceFileRenameAcquireShared(PDEVICE_OBJECT DeviceObject)
{
PAGED_CODE();
FSP_FSVOL_DEVICE_EXTENSION *FsvolDeviceExtension = FspFsvolDeviceExtension(DeviceObject);
ExAcquireResourceSharedLite(&FsvolDeviceExtension->FileRenameResource, TRUE);
}
BOOLEAN FspFsvolDeviceFileRenameTryAcquireShared(PDEVICE_OBJECT DeviceObject)
{
PAGED_CODE();
FSP_FSVOL_DEVICE_EXTENSION *FsvolDeviceExtension = FspFsvolDeviceExtension(DeviceObject);
return ExAcquireResourceSharedLite(&FsvolDeviceExtension->FileRenameResource, FALSE);
}
VOID FspFsvolDeviceFileRenameAcquireExclusive(PDEVICE_OBJECT DeviceObject)
{
PAGED_CODE();
FSP_FSVOL_DEVICE_EXTENSION *FsvolDeviceExtension = FspFsvolDeviceExtension(DeviceObject);
ExAcquireResourceExclusiveLite(&FsvolDeviceExtension->FileRenameResource, TRUE);
}
BOOLEAN FspFsvolDeviceFileRenameTryAcquireExclusive(PDEVICE_OBJECT DeviceObject)
{
PAGED_CODE();
FSP_FSVOL_DEVICE_EXTENSION *FsvolDeviceExtension = FspFsvolDeviceExtension(DeviceObject);
return ExAcquireResourceExclusiveLite(&FsvolDeviceExtension->FileRenameResource, FALSE);
}
VOID FspFsvolDeviceFileRenameSetOwner(PDEVICE_OBJECT DeviceObject, PVOID Owner)
{
PAGED_CODE();
FSP_FSVOL_DEVICE_EXTENSION *FsvolDeviceExtension = FspFsvolDeviceExtension(DeviceObject);
Owner = (PVOID)((UINT_PTR)Owner | 3);
ExSetResourceOwnerPointer(&FsvolDeviceExtension->FileRenameResource, Owner);
}
VOID FspFsvolDeviceFileRenameRelease(PDEVICE_OBJECT DeviceObject)
{
PAGED_CODE();
FSP_FSVOL_DEVICE_EXTENSION *FsvolDeviceExtension = FspFsvolDeviceExtension(DeviceObject);
ExReleaseResourceLite(&FsvolDeviceExtension->FileRenameResource);
}
VOID FspFsvolDeviceFileRenameReleaseOwner(PDEVICE_OBJECT DeviceObject, PVOID Owner)
{
PAGED_CODE();
FSP_FSVOL_DEVICE_EXTENSION *FsvolDeviceExtension = FspFsvolDeviceExtension(DeviceObject);
Owner = (PVOID)((UINT_PTR)Owner | 3);
if (ExIsResourceAcquiredLite(&FsvolDeviceExtension->FileRenameResource))
ExReleaseResourceLite(&FsvolDeviceExtension->FileRenameResource);
else
ExReleaseResourceForThreadLite(&FsvolDeviceExtension->FileRenameResource, (ERESOURCE_THREAD)Owner);
}
BOOLEAN FspFsvolDeviceFileRenameIsAcquiredExclusive(PDEVICE_OBJECT DeviceObject)
{
PAGED_CODE();
FSP_FSVOL_DEVICE_EXTENSION *FsvolDeviceExtension = FspFsvolDeviceExtension(DeviceObject);
return ExIsResourceAcquiredExclusiveLite(&FsvolDeviceExtension->FileRenameResource);
}
VOID FspFsvolDeviceLockContextTable(PDEVICE_OBJECT DeviceObject)
{
PAGED_CODE();
FSP_FSVOL_DEVICE_EXTENSION *FsvolDeviceExtension = FspFsvolDeviceExtension(DeviceObject);
ExAcquireResourceExclusiveLite(&FsvolDeviceExtension->ContextTableResource, TRUE);
}
VOID FspFsvolDeviceUnlockContextTable(PDEVICE_OBJECT DeviceObject)
{
PAGED_CODE();
FSP_FSVOL_DEVICE_EXTENSION *FsvolDeviceExtension = FspFsvolDeviceExtension(DeviceObject);
ExReleaseResourceLite(&FsvolDeviceExtension->ContextTableResource);
}
NTSTATUS FspFsvolDeviceCopyContextList(PDEVICE_OBJECT DeviceObject,
PVOID **PContexts, PULONG PContextCount)
{
PAGED_CODE();
FSP_FSVOL_DEVICE_EXTENSION *FsvolDeviceExtension = FspFsvolDeviceExtension(DeviceObject);
PVOID *Contexts;
ULONG ContextCount, Index;
*PContexts = 0;
*PContextCount = 0;
ContextCount = 0;
for (
PLIST_ENTRY Head = &FsvolDeviceExtension->ContextList, Entry = Head->Flink;
Head != Entry;
Entry = Entry->Flink)
{
ContextCount++;
}
/* if ContextCount == 0 allocate an empty Context list */
Contexts = FspAlloc(sizeof(PVOID) * (0 != ContextCount ? ContextCount : 1));
if (0 == Contexts)
return STATUS_INSUFFICIENT_RESOURCES;
Index = 0;
for (
PLIST_ENTRY Head = &FsvolDeviceExtension->ContextList, Entry = Head->Flink;
Head != Entry;
Entry = Entry->Flink)
{
ASSERT(Index < ContextCount);
Contexts[Index++] = CONTAINING_RECORD(Entry, FSP_FILE_NODE, ActiveEntry);
/* assume that Contexts can only be FSP_FILE_NODE's */
}
ASSERT(Index == ContextCount);
*PContexts = Contexts;
*PContextCount = Index;
return STATUS_SUCCESS;
}
NTSTATUS FspFsvolDeviceCopyContextByNameList(PDEVICE_OBJECT DeviceObject,
PVOID **PContexts, PULONG PContextCount)
{
PAGED_CODE();
FSP_FSVOL_DEVICE_EXTENSION *FsvolDeviceExtension = FspFsvolDeviceExtension(DeviceObject);
FSP_DEVICE_CONTEXT_BY_NAME_TABLE_ELEMENT_DATA *Data;
PVOID *Contexts;
ULONG ContextCount, Index;
*PContexts = 0;
*PContextCount = 0;
ContextCount = RtlNumberGenericTableElementsAvl(&FsvolDeviceExtension->ContextByNameTable);
/* if ContextCount == 0 allocate an empty Context list */
Contexts = FspAlloc(sizeof(PVOID) * (0 != ContextCount ? ContextCount : 1));
if (0 == Contexts)
return STATUS_INSUFFICIENT_RESOURCES;
Index = 0;
Data = RtlEnumerateGenericTableAvl(&FsvolDeviceExtension->ContextByNameTable, TRUE);
while (Index < ContextCount && 0 != Data)
{
Contexts[Index++] = Data->Context;
Data = RtlEnumerateGenericTableAvl(&FsvolDeviceExtension->ContextByNameTable, FALSE);
}
*PContexts = Contexts;
*PContextCount = Index;
return STATUS_SUCCESS;
}
VOID FspFsvolDeviceDeleteContextList(PVOID *Contexts, ULONG ContextCount)
{
PAGED_CODE();
FspFree(Contexts);
}
PVOID FspFsvolDeviceEnumerateContextByName(PDEVICE_OBJECT DeviceObject, PUNICODE_STRING FileName,
BOOLEAN NextFlag, FSP_DEVICE_CONTEXT_BY_NAME_TABLE_RESTART_KEY *RestartKey)
{
PAGED_CODE();
FSP_FSVOL_DEVICE_EXTENSION *FsvolDeviceExtension = FspFsvolDeviceExtension(DeviceObject);
BOOLEAN CaseInsensitive = 0 == FsvolDeviceExtension->VolumeParams.CaseSensitiveSearch;
FSP_DEVICE_CONTEXT_BY_NAME_TABLE_ELEMENT_DATA *Result;
if (0 != RestartKey->RestartKey)
NextFlag = TRUE;
Result = RtlEnumerateGenericTableLikeADirectory(&FsvolDeviceExtension->ContextByNameTable,
0, 0, NextFlag, &RestartKey->RestartKey, &RestartKey->DeleteCount, &FileName);
if (0 != Result &&
FspFileNameIsPrefix(FileName, Result->FileName, CaseInsensitive, 0) &&
(FileName->Length == Result->FileName->Length ||
(L'\\' == Result->FileName->Buffer[FileName->Length / sizeof(WCHAR)] ||
L':' == Result->FileName->Buffer[FileName->Length / sizeof(WCHAR)])))
return Result->Context;
else
return 0;
}
PVOID FspFsvolDeviceLookupContextByName(PDEVICE_OBJECT DeviceObject, PUNICODE_STRING FileName)
{
PAGED_CODE();
FSP_FSVOL_DEVICE_EXTENSION *FsvolDeviceExtension = FspFsvolDeviceExtension(DeviceObject);
FSP_DEVICE_CONTEXT_BY_NAME_TABLE_ELEMENT_DATA *Result;
Result = RtlLookupElementGenericTableAvl(&FsvolDeviceExtension->ContextByNameTable, &FileName);
return 0 != Result ? Result->Context : 0;
}
PVOID FspFsvolDeviceInsertContextByName(PDEVICE_OBJECT DeviceObject, PUNICODE_STRING FileName, PVOID Context,
FSP_DEVICE_CONTEXT_BY_NAME_TABLE_ELEMENT *ElementStorage, PBOOLEAN PInserted)
{
PAGED_CODE();
FSP_FSVOL_DEVICE_EXTENSION *FsvolDeviceExtension = FspFsvolDeviceExtension(DeviceObject);
FSP_DEVICE_CONTEXT_BY_NAME_TABLE_ELEMENT_DATA *Result, Element = { 0 };
ASSERT(0 != ElementStorage);
Element.FileName = FileName;
Element.Context = Context;
FsvolDeviceExtension->ContextByNameTableElementStorage = ElementStorage;
Result = RtlInsertElementGenericTableAvl(&FsvolDeviceExtension->ContextByNameTable,
&Element, sizeof Element, PInserted);
FsvolDeviceExtension->ContextByNameTableElementStorage = 0;
ASSERT(0 != Result);
return Result->Context;
}
VOID FspFsvolDeviceDeleteContextByName(PDEVICE_OBJECT DeviceObject, PUNICODE_STRING FileName,
PBOOLEAN PDeleted)
{
PAGED_CODE();
FSP_FSVOL_DEVICE_EXTENSION *FsvolDeviceExtension = FspFsvolDeviceExtension(DeviceObject);
BOOLEAN Deleted;
Deleted = RtlDeleteElementGenericTableAvl(&FsvolDeviceExtension->ContextByNameTable, &FileName);
if (0 != PDeleted)
*PDeleted = Deleted;
}
static RTL_GENERIC_COMPARE_RESULTS NTAPI FspFsvolDeviceCompareContextByName(
PRTL_AVL_TABLE Table, PVOID FirstElement, PVOID SecondElement)
{
PAGED_CODE();
FSP_FSVOL_DEVICE_EXTENSION *FsvolDeviceExtension =
CONTAINING_RECORD(Table, FSP_FSVOL_DEVICE_EXTENSION, ContextByNameTable);
BOOLEAN CaseInsensitive = 0 == FsvolDeviceExtension->VolumeParams.CaseSensitiveSearch;
PUNICODE_STRING FirstFileName = *(PUNICODE_STRING *)FirstElement;
PUNICODE_STRING SecondFileName = *(PUNICODE_STRING *)SecondElement;
LONG ComparisonResult;
/*
* Since FileNode FileName's are now always normalized, we could perhaps get away
* with using CaseInsensitive == FALSE at all times. For safety reasons we avoid
* doing so here.
*/
ComparisonResult = FspFileNameCompare(FirstFileName, SecondFileName, CaseInsensitive, 0);
if (0 > ComparisonResult)
return GenericLessThan;
else
if (0 < ComparisonResult)
return GenericGreaterThan;
else
return GenericEqual;
}
static PVOID NTAPI FspFsvolDeviceAllocateContextByName(
PRTL_AVL_TABLE Table, CLONG ByteSize)
{
PAGED_CODE();
FSP_FSVOL_DEVICE_EXTENSION *FsvolDeviceExtension =
CONTAINING_RECORD(Table, FSP_FSVOL_DEVICE_EXTENSION, ContextByNameTable);
ASSERT(sizeof(FSP_DEVICE_CONTEXT_BY_NAME_TABLE_ELEMENT) == ByteSize);
return FsvolDeviceExtension->ContextByNameTableElementStorage;
}
static VOID NTAPI FspFsvolDeviceFreeContextByName(
PRTL_AVL_TABLE Table, PVOID Buffer)
{
PAGED_CODE();
}
VOID FspFsvolDeviceGetVolumeInfo(PDEVICE_OBJECT DeviceObject, FSP_FSCTL_VOLUME_INFO *VolumeInfo)
{
// !PAGED_CODE();
FSP_FSVOL_DEVICE_EXTENSION *FsvolDeviceExtension = FspFsvolDeviceExtension(DeviceObject);
FSP_FSCTL_VOLUME_INFO VolumeInfoNp;
KIRQL Irql;
KeAcquireSpinLock(&FsvolDeviceExtension->InfoSpinLock, &Irql);
VolumeInfoNp = FsvolDeviceExtension->VolumeInfo;
KeReleaseSpinLock(&FsvolDeviceExtension->InfoSpinLock, Irql);
*VolumeInfo = VolumeInfoNp;
}
#pragma warning(push)
#pragma warning(disable:4701) /* disable idiotic warning! */
BOOLEAN FspFsvolDeviceTryGetVolumeInfo(PDEVICE_OBJECT DeviceObject, FSP_FSCTL_VOLUME_INFO *VolumeInfo)
{
// !PAGED_CODE();
FSP_FSVOL_DEVICE_EXTENSION *FsvolDeviceExtension = FspFsvolDeviceExtension(DeviceObject);
FSP_FSCTL_VOLUME_INFO VolumeInfoNp;
KIRQL Irql;
BOOLEAN Result;
KeAcquireSpinLock(&FsvolDeviceExtension->InfoSpinLock, &Irql);
if (FspExpirationTimeValid(FsvolDeviceExtension->InfoExpirationTime))
{
VolumeInfoNp = FsvolDeviceExtension->VolumeInfo;
Result = TRUE;
}
else
Result = FALSE;
KeReleaseSpinLock(&FsvolDeviceExtension->InfoSpinLock, Irql);
if (Result)
*VolumeInfo = VolumeInfoNp;
return Result;
}
#pragma warning(pop)
VOID FspFsvolDeviceSetVolumeInfo(PDEVICE_OBJECT DeviceObject, const FSP_FSCTL_VOLUME_INFO *VolumeInfo)
{
// !PAGED_CODE();
FSP_FSVOL_DEVICE_EXTENSION *FsvolDeviceExtension = FspFsvolDeviceExtension(DeviceObject);
FSP_FSCTL_VOLUME_INFO VolumeInfoNp = *VolumeInfo;
KIRQL Irql;
KeAcquireSpinLock(&FsvolDeviceExtension->InfoSpinLock, &Irql);
FsvolDeviceExtension->VolumeInfo = VolumeInfoNp;
FsvolDeviceExtension->InfoExpirationTime = FspExpirationTimeFromMillis(
FsvolDeviceExtension->VolumeParams.VolumeInfoTimeout);
KeReleaseSpinLock(&FsvolDeviceExtension->InfoSpinLock, Irql);
}
VOID FspFsvolDeviceInvalidateVolumeInfo(PDEVICE_OBJECT DeviceObject)
{
// !PAGED_CODE();
FSP_FSVOL_DEVICE_EXTENSION *FsvolDeviceExtension = FspFsvolDeviceExtension(DeviceObject);
KIRQL Irql;
KeAcquireSpinLock(&FsvolDeviceExtension->InfoSpinLock, &Irql);
FsvolDeviceExtension->InfoExpirationTime = 0;
KeReleaseSpinLock(&FsvolDeviceExtension->InfoSpinLock, Irql);
}
static NTSTATUS FspFsmupDeviceInit(PDEVICE_OBJECT DeviceObject)
{
PAGED_CODE();
FSP_FSMUP_DEVICE_EXTENSION *FsmupDeviceExtension = FspFsmupDeviceExtension(DeviceObject);
/* initialize our prefix table */
ExInitializeResourceLite(&FsmupDeviceExtension->PrefixTableResource);
RtlInitializeUnicodePrefix(&FsmupDeviceExtension->PrefixTable);
RtlInitializeUnicodePrefix(&FsmupDeviceExtension->ClassTable);
FsmupDeviceExtension->InitDonePfxTab = 1;
return STATUS_SUCCESS;
}
static VOID FspFsmupDeviceFini(PDEVICE_OBJECT DeviceObject)
{
PAGED_CODE();
FSP_FSMUP_DEVICE_EXTENSION *FsmupDeviceExtension = FspFsmupDeviceExtension(DeviceObject);
if (FsmupDeviceExtension->InitDonePfxTab)
{
/*
* Normally we would have to finalize our prefix table. This is not necessary as all
* prefixes will be gone if this code ever gets reached.
*/
ASSERT(0 == RtlNextUnicodePrefix(&FsmupDeviceExtension->PrefixTable, TRUE));
ASSERT(0 == RtlNextUnicodePrefix(&FsmupDeviceExtension->ClassTable, TRUE));
ExDeleteResourceLite(&FsmupDeviceExtension->PrefixTableResource);
}
}
NTSTATUS FspDeviceCopyList(
PDEVICE_OBJECT **PDeviceObjects, PULONG PDeviceObjectCount)
{