--- truecrypt/driver/encryptedioqueue.c 2018/04/24 16:54:55 1.1.1.5 +++ truecrypt/driver/encryptedioqueue.c 2018/04/24 17:03:15 1.1.1.9 @@ -1,7 +1,7 @@ /* - Copyright (c) 2008 TrueCrypt Foundation. All rights reserved. + Copyright (c) 2008-2009 TrueCrypt Foundation. All rights reserved. - Governed by the TrueCrypt License 2.5 the full text of which is contained + Governed by the TrueCrypt License 2.7 the full text of which is contained in the file License.txt included in TrueCrypt binary and source code distribution packages. */ @@ -9,11 +9,143 @@ #include "TCdefs.h" #include "Apidrvr.h" #include "Ntdriver.h" +#include "DriveFilter.h" #include "EncryptedIoQueue.h" #include "EncryptionThreadPool.h" #include "Volumes.h" +static void AcquireBufferPoolMutex (EncryptedIoQueue *queue) +{ + NTSTATUS status; + + status = KeWaitForMutexObject (&queue->BufferPoolMutex, Executive, KernelMode, FALSE, NULL); + if (!NT_SUCCESS (status)) + TC_BUG_CHECK (status); +} + + +static void ReleaseBufferPoolMutex (EncryptedIoQueue *queue) +{ + KeReleaseMutex (&queue->BufferPoolMutex, FALSE); +} + + +static void *GetPoolBuffer (EncryptedIoQueue *queue, ULONG requestedSize) +{ + EncryptedIoQueueBuffer *buffer; + void *bufferAddress = NULL; + BOOL requestedSizePresentInPool = FALSE; + + while (TRUE) + { + AcquireBufferPoolMutex (queue); + + for (buffer = queue->FirstPoolBuffer; ; buffer = buffer->NextBuffer) + { + if (buffer && buffer->Size == requestedSize) + { + requestedSizePresentInPool = TRUE; + + if (!buffer->InUse) + { + // Reuse a free buffer + buffer->InUse = TRUE; + bufferAddress = buffer->Address; + break; + } + } + + if (!buffer || !buffer->NextBuffer) + { + EncryptedIoQueueBuffer *newBuffer; + + if (requestedSizePresentInPool && !queue->StartPending) + break; + + // Allocate a new buffer + newBuffer = TCalloc (sizeof (EncryptedIoQueueBuffer)); + if (!newBuffer) + { + bufferAddress = NULL; + break; + } + + bufferAddress = TCalloc (requestedSize); + if (bufferAddress) + { + newBuffer->NextBuffer = NULL; + newBuffer->Address = bufferAddress; + newBuffer->Size = requestedSize; + newBuffer->InUse = TRUE; + + if (!buffer) + queue->FirstPoolBuffer = newBuffer; + else + buffer->NextBuffer = newBuffer; + } + else + TCfree (newBuffer); + + break; + } + } + + ReleaseBufferPoolMutex (queue); + + if (bufferAddress || !requestedSizePresentInPool || queue->StartPending) + break; + + KeWaitForSingleObject (&queue->PoolBufferFreeEvent, Executive, KernelMode, FALSE, NULL); + } + + return bufferAddress; +} + + +static void ReleasePoolBuffer (EncryptedIoQueue *queue, void *address) +{ + EncryptedIoQueueBuffer *buffer; + AcquireBufferPoolMutex (queue); + + for (buffer = queue->FirstPoolBuffer; buffer != NULL; buffer = buffer->NextBuffer) + { + if (buffer->Address == address) + { + ASSERT (buffer->InUse); + + buffer->InUse = FALSE; + break; + } + } + + ReleaseBufferPoolMutex (queue); + KeSetEvent (&queue->PoolBufferFreeEvent, IO_DISK_INCREMENT, FALSE); +} + + +static void FreePoolBuffers (EncryptedIoQueue *queue) +{ + EncryptedIoQueueBuffer *buffer; + AcquireBufferPoolMutex (queue); + + for (buffer = queue->FirstPoolBuffer; buffer != NULL; ) + { + EncryptedIoQueueBuffer *nextBuffer = buffer->NextBuffer; + + ASSERT (!buffer->InUse); + + TCfree (buffer->Address); + TCfree (buffer); + + buffer = nextBuffer; + } + + queue->FirstPoolBuffer = NULL; + ReleaseBufferPoolMutex (queue); +} + + static void DecrementOutstandingIoCount (EncryptedIoQueue *queue) { if (InterlockedDecrement (&queue->OutstandingIoCount) == 0 && (queue->SuspendPending || queue->StopPending)) @@ -37,14 +169,16 @@ static void OnItemCompleted (EncryptedIo } if (freeItem) - TCfree (item); + ReleasePoolBuffer (item->Queue, item); } static NTSTATUS CompleteOriginalIrp (EncryptedIoQueueItem *item, NTSTATUS status, ULONG_PTR information) { - //Dump ("Queue comp offset=%I64d status=%x info=%p out=%d\n", item->OriginalOffset, status, information, item->Queue->OutstandingIoCount - 1); - +#ifdef TC_TRACE_IO_QUEUE + Dump ("< %I64d [%I64d] %c status=%x info=%I64d\n", item->OriginalIrpOffset, GetElapsedTime (&item->Queue->LastPerformanceCounter), item->Write ? 'W' : 'R', status, (int64) information); +#endif + TCCompleteDiskIrp (item->OriginalIrp, status, information); item->Status = status; @@ -135,7 +269,7 @@ static VOID CompletionThreadProc (PVOID KeSetEvent (&queue->RequestCompletedEvent, IO_DISK_INCREMENT, FALSE); } - TCfree (request); + ReleasePoolBuffer (queue, request); } } @@ -143,6 +277,31 @@ static VOID CompletionThreadProc (PVOID } +static NTSTATUS TCCachedRead (EncryptedIoQueue *queue, IO_STATUS_BLOCK *ioStatus, PVOID buffer, LARGE_INTEGER offset, ULONG length) +{ + queue->LastReadOffset = offset; + queue->LastReadLength = length; + + if (queue->ReadAheadBufferValid && queue->ReadAheadOffset.QuadPart == offset.QuadPart && queue->ReadAheadLength >= length) + { + memcpy (buffer, queue->ReadAheadBuffer, length); + + if (!queue->IsFilterDevice) + { + ioStatus->Information = length; + ioStatus->Status = STATUS_SUCCESS; + } + + return STATUS_SUCCESS; + } + + if (queue->IsFilterDevice) + return TCReadDevice (queue->LowerDeviceObject, buffer, offset, length); + + return ZwReadFile (queue->HostFileHandle, NULL, NULL, NULL, ioStatus, buffer, length, &offset, NULL); +} + + static VOID IoThreadProc (PVOID threadArg) { EncryptedIoQueue *queue = (EncryptedIoQueue *) threadArg; @@ -151,6 +310,15 @@ static VOID IoThreadProc (PVOID threadAr KeSetPriorityThread (KeGetCurrentThread(), LOW_REALTIME_PRIORITY); + if (!queue->IsFilterDevice && queue->SecurityClientContext) + { +#ifdef DEBUG + NTSTATUS status = +#endif + SeImpersonateClientEx (queue->SecurityClientContext, NULL); + ASSERT (NT_SUCCESS (status)); + } + while (!queue->ThreadExitRequested) { if (!NT_SUCCESS (KeWaitForSingleObject (&queue->IoThreadQueueNotEmptyEvent, Executive, KernelMode, FALSE, NULL))) @@ -161,8 +329,13 @@ static VOID IoThreadProc (PVOID threadAr while ((listEntry = ExInterlockedRemoveHeadList (&queue->IoThreadQueue, &queue->IoThreadQueueLock))) { + InterlockedDecrement (&queue->IoThreadPendingRequestCount); request = CONTAINING_RECORD (listEntry, EncryptedIoRequest, ListEntry); +#ifdef TC_TRACE_IO_QUEUE + Dump ("%c %I64d [%I64d] roff=%I64d rlen=%d\n", request->Item->Write ? 'W' : 'R', request->Item->OriginalIrpOffset.QuadPart, GetElapsedTime (&queue->LastPerformanceCounter), request->Offset.QuadPart, request->Length); +#endif + // Perform IO request if no preceding request of the item failed if (NT_SUCCESS (request->Item->Status)) { @@ -204,7 +377,7 @@ static VOID IoThreadProc (PVOID threadAr if (request->Item->Write) request->Item->Status = TCWriteDevice (queue->LowerDeviceObject, subFragmentData, subFragmentOffset, subFragmentLength); else - request->Item->Status = TCReadDevice (queue->LowerDeviceObject, subFragmentData, subFragmentOffset, subFragmentLength); + request->Item->Status = TCCachedRead (queue, NULL, subFragmentData, subFragmentOffset, subFragmentLength); subFragmentData += subFragmentLength; } @@ -219,7 +392,7 @@ static VOID IoThreadProc (PVOID threadAr if (request->Item->Write) request->Item->Status = TCWriteDevice (queue->LowerDeviceObject, request->Data, remappedOffset, request->Length); else - request->Item->Status = TCReadDevice (queue->LowerDeviceObject, request->Data, remappedOffset, request->Length); + request->Item->Status = TCCachedRead (queue, NULL, request->Data, remappedOffset, request->Length); } } else @@ -227,7 +400,7 @@ static VOID IoThreadProc (PVOID threadAr if (request->Item->Write) request->Item->Status = TCWriteDevice (queue->LowerDeviceObject, request->Data, request->Offset, request->Length); else - request->Item->Status = TCReadDevice (queue->LowerDeviceObject, request->Data, request->Offset, request->Length); + request->Item->Status = TCCachedRead (queue, NULL, request->Data, request->Offset, request->Length); } } else @@ -237,7 +410,7 @@ static VOID IoThreadProc (PVOID threadAr if (request->Item->Write) request->Item->Status = ZwWriteFile (queue->HostFileHandle, NULL, NULL, NULL, &ioStatus, request->Data, request->Length, &request->Offset, NULL); else - request->Item->Status = ZwReadFile (queue->HostFileHandle, NULL, NULL, NULL, &ioStatus, request->Data, request->Length, &request->Offset, NULL); + request->Item->Status = TCCachedRead (queue, &ioStatus, request->Data, request->Offset, request->Length); if (NT_SUCCESS (request->Item->Status) && ioStatus.Information != request->Length) request->Item->Status = STATUS_END_OF_FILE; @@ -246,6 +419,8 @@ static VOID IoThreadProc (PVOID threadAr if (request->Item->Write) { + queue->ReadAheadBufferValid = FALSE; + ReleaseFragmentBuffer (queue, request->Data); if (request->CompleteOriginalIrp) @@ -259,18 +434,56 @@ static VOID IoThreadProc (PVOID threadAr KeSetEvent (&queue->RequestCompletedEvent, IO_DISK_INCREMENT, FALSE); } - TCfree (request); + ReleasePoolBuffer (queue, request); } else { + BOOL readAhead = FALSE; + if (NT_SUCCESS (request->Item->Status)) memcpy (request->OrigDataBufferFragment, request->Data, request->Length); ReleaseFragmentBuffer (queue, request->Data); request->Data = request->OrigDataBufferFragment; + if (request->CompleteOriginalIrp + && queue->LastReadLength > 0 + && NT_SUCCESS (request->Item->Status) + && InterlockedExchangeAdd (&queue->IoThreadPendingRequestCount, 0) == 0) + { + readAhead = TRUE; + InterlockedIncrement (&queue->OutstandingIoCount); + } + ExInterlockedInsertTailList (&queue->CompletionThreadQueue, &request->CompletionListEntry, &queue->CompletionThreadQueueLock); KeSetEvent (&queue->CompletionThreadQueueNotEmptyEvent, IO_DISK_INCREMENT, FALSE); + + if (readAhead) + { + queue->ReadAheadBufferValid = FALSE; + queue->ReadAheadOffset.QuadPart = queue->LastReadOffset.QuadPart + queue->LastReadLength; + queue->ReadAheadLength = queue->LastReadLength; + +#ifdef TC_TRACE_IO_QUEUE + Dump ("A %I64d [%I64d] roff=%I64d rlen=%d\n", request->Item->OriginalIrpOffset.QuadPart, GetElapsedTime (&queue->LastPerformanceCounter), queue->ReadAheadOffset, queue->ReadAheadLength); +#endif + + if (queue->ReadAheadOffset.QuadPart + queue->ReadAheadLength <= queue->MaxReadAheadOffset.QuadPart) + { + if (queue->IsFilterDevice) + { + queue->ReadAheadBufferValid = NT_SUCCESS (TCReadDevice (queue->LowerDeviceObject, queue->ReadAheadBuffer, queue->ReadAheadOffset, queue->ReadAheadLength)); + } + else + { + IO_STATUS_BLOCK ioStatus; + queue->ReadAheadBufferValid = NT_SUCCESS (ZwReadFile (queue->HostFileHandle, NULL, NULL, NULL, &ioStatus, queue->ReadAheadBuffer, queue->ReadAheadLength, &queue->ReadAheadOffset, NULL)); + queue->ReadAheadLength = (ULONG) ioStatus.Information; + } + } + + DecrementOutstandingIoCount (queue); + } } } } @@ -279,16 +492,6 @@ static VOID IoThreadProc (PVOID threadAr } -static NTSTATUS OnPassedIrpCompleted (PDEVICE_OBJECT filterDeviceObject, PIRP irp, EncryptedIoQueueItem *item) -{ - if (irp->PendingReturned) - IoMarkIrpPending (irp); - - OnItemCompleted (item, TRUE); - return STATUS_CONTINUE_COMPLETION; -} - - static VOID MainThreadProc (PVOID threadArg) { EncryptedIoQueue *queue = (EncryptedIoQueue *) threadArg; @@ -303,9 +506,8 @@ static VOID MainThreadProc (PVOID thread uint64 intersectStart; uint32 intersectLength; - int mdlWaitTime; - LARGE_INTEGER mdlWaitInterval; - mdlWaitInterval.QuadPart = TC_ENC_IO_QUEUE_MEM_ALLOC_RETRY_DELAY * -10000; + int64 mdlWaitTime; + LARGE_INTEGER mdlWaitPerfCounter; if (IsEncryptionThreadPoolRunning()) KeSetPriorityThread (KeGetCurrentThread(), LOW_REALTIME_PRIORITY); @@ -323,7 +525,7 @@ static VOID MainThreadProc (PVOID thread if (queue->Suspended) KeWaitForSingleObject (&queue->QueueResumedEvent, Executive, KernelMode, FALSE, NULL); - item = AllocateMemoryWithTimeout (sizeof (EncryptedIoQueueItem), TC_ENC_IO_QUEUE_MEM_ALLOC_RETRY_DELAY, TC_ENC_IO_QUEUE_MEM_ALLOC_TIMEOUT); + item = GetPoolBuffer (queue, sizeof (EncryptedIoQueueItem)); if (!item) { EncryptedIoQueueItem stackItem; @@ -367,12 +569,58 @@ static VOID MainThreadProc (PVOID thread continue; } - // Pass the IRP if the drive is not encrypted - if (queue->IsFilterDevice && (queue->EncryptedAreaStart == -1 || queue->EncryptedAreaEnd == -1)) +#ifdef TC_TRACE_IO_QUEUE + item->OriginalIrpOffset = item->OriginalOffset; +#endif + + // Handle misaligned read operations to work around a bug in Windows System Assessment Tool which does not follow FILE_FLAG_NO_BUFFERING requirements when benchmarking disk devices + if (queue->IsFilterDevice + && !item->Write + && item->OriginalLength > 0 + && (item->OriginalLength & (ENCRYPTION_DATA_UNIT_SIZE - 1)) == 0 + && (item->OriginalOffset.QuadPart & (ENCRYPTION_DATA_UNIT_SIZE - 1)) != 0) { - IoCopyCurrentIrpStackLocationToNext (irp); - IoSetCompletionRoutine (irp, OnPassedIrpCompleted, item, TRUE, TRUE, TRUE); - IoCallDriver (queue->LowerDeviceObject, irp); + byte *buffer; + ULONG alignedLength = item->OriginalLength + ENCRYPTION_DATA_UNIT_SIZE; + LARGE_INTEGER alignedOffset; + alignedOffset.QuadPart = item->OriginalOffset.QuadPart & ~((LONGLONG) ENCRYPTION_DATA_UNIT_SIZE - 1); + + buffer = TCalloc (alignedLength); + if (!buffer) + { + CompleteOriginalIrp (item, STATUS_INSUFFICIENT_RESOURCES, 0); + continue; + } + + item->Status = TCReadDevice (queue->LowerDeviceObject, buffer, alignedOffset, alignedLength); + + if (NT_SUCCESS (item->Status)) + { + UINT64_STRUCT dataUnit; + + dataBuffer = (PUCHAR) MmGetSystemAddressForMdlSafe (irp->MdlAddress, HighPagePriority); + if (!dataBuffer) + { + TCfree (buffer); + CompleteOriginalIrp (item, STATUS_INSUFFICIENT_RESOURCES, 0); + continue; + } + + if (queue->EncryptedAreaStart != -1 && queue->EncryptedAreaEnd != -1) + { + GetIntersection (alignedOffset.QuadPart, alignedLength, queue->EncryptedAreaStart, queue->EncryptedAreaEnd, &intersectStart, &intersectLength); + if (intersectLength > 0) + { + dataUnit.Value = intersectStart / ENCRYPTION_DATA_UNIT_SIZE; + DecryptDataUnits (buffer + (intersectStart - alignedOffset.QuadPart), &dataUnit, intersectLength / ENCRYPTION_DATA_UNIT_SIZE, queue->CryptoInfo); + } + } + + memcpy (dataBuffer, buffer + (item->OriginalOffset.LowPart & (ENCRYPTION_DATA_UNIT_SIZE - 1)), item->OriginalLength); + } + + TCfree (buffer); + CompleteOriginalIrp (item, item->Status, NT_SUCCESS (item->Status) ? item->OriginalLength : 0); continue; } @@ -386,7 +634,9 @@ static VOID MainThreadProc (PVOID thread continue; } - //Dump ("--- Queue %c %I64d (%I64d) %d out=%d\n", item->Write ? 'W' : 'R', item->OriginalOffset.QuadPart, item->OriginalOffset.QuadPart / 1024 / 1024, item->OriginalLength, queue->OutstandingIoCount); +#ifdef TC_TRACE_IO_QUEUE + Dump ("Q %I64d [%I64d] %c len=%d\n", item->OriginalOffset.QuadPart, GetElapsedTime (&queue->LastPerformanceCounter), item->Write ? 'W' : 'R', item->OriginalLength); +#endif if (!queue->IsFilterDevice) { @@ -425,9 +675,18 @@ static VOID MainThreadProc (PVOID thread } } } + else if (item->Write && IsHiddenSystemRunning() + && (RegionsOverlap (item->OriginalOffset.QuadPart, item->OriginalOffset.QuadPart + item->OriginalLength - 1, SECTOR_SIZE, TC_BOOT_LOADER_AREA_SECTOR_COUNT * SECTOR_SIZE - 1) + || RegionsOverlap (item->OriginalOffset.QuadPart, item->OriginalOffset.QuadPart + item->OriginalLength - 1, GetBootDriveLength(), _I64_MAX))) + { + Dump ("Preventing write to boot loader or host protected area\n"); + CompleteOriginalIrp (item, STATUS_MEDIA_WRITE_PROTECTED, 0); + continue; + } // Original IRP data buffer mdlWaitTime = 0; + mdlWaitPerfCounter.QuadPart = 0; while (TRUE) { dataBuffer = (PUCHAR) MmGetSystemAddressForMdlSafe (irp->MdlAddress, HighPagePriority); @@ -435,8 +694,11 @@ static VOID MainThreadProc (PVOID thread if (dataBuffer || mdlWaitTime >= TC_ENC_IO_QUEUE_MEM_ALLOC_TIMEOUT) break; - KeDelayExecutionThread (KernelMode, FALSE, &mdlWaitInterval); - mdlWaitTime += TC_ENC_IO_QUEUE_MEM_ALLOC_RETRY_DELAY; + if (mdlWaitPerfCounter.QuadPart == 0) + GetElapsedTimeInit (&mdlWaitPerfCounter); + + TCSleep (TC_ENC_IO_QUEUE_MEM_ALLOC_RETRY_DELAY); + mdlWaitTime += GetElapsedTime (&mdlWaitPerfCounter) / 1000; } if (dataBuffer == NULL) @@ -458,7 +720,7 @@ static VOID MainThreadProc (PVOID thread activeFragmentBuffer = (activeFragmentBuffer == queue->FragmentBufferA ? queue->FragmentBufferB : queue->FragmentBufferA); // Create IO request - request = (EncryptedIoRequest *) AllocateMemoryWithTimeout (sizeof (EncryptedIoRequest), TC_ENC_IO_QUEUE_MEM_ALLOC_RETRY_DELAY, TC_ENC_IO_QUEUE_MEM_ALLOC_TIMEOUT); + request = GetPoolBuffer (queue, sizeof (EncryptedIoRequest)); if (!request) { while (InterlockedExchangeAdd (&item->OutstandingRequestCount, 0) > 0) @@ -468,6 +730,8 @@ static VOID MainThreadProc (PVOID thread break; } + InterlockedIncrement (&queue->IoThreadPendingRequestCount); + request->Item = item; request->CompleteOriginalIrp = isLastFragment; request->Offset = fragmentOffset; @@ -477,11 +741,18 @@ static VOID MainThreadProc (PVOID thread if (queue->IsFilterDevice) { - // Get intersection of data fragment with encrypted area - GetIntersection (fragmentOffset.QuadPart, dataFragmentLength, queue->EncryptedAreaStart, queue->EncryptedAreaEnd, &intersectStart, &intersectLength); + if (queue->EncryptedAreaStart == -1 || queue->EncryptedAreaEnd == -1) + { + request->EncryptedLength = 0; + } + else + { + // Get intersection of data fragment with encrypted area + GetIntersection (fragmentOffset.QuadPart, dataFragmentLength, queue->EncryptedAreaStart, queue->EncryptedAreaEnd, &intersectStart, &intersectLength); - request->EncryptedOffset = intersectStart - fragmentOffset.QuadPart; - request->EncryptedLength = intersectLength; + request->EncryptedOffset = intersectStart - fragmentOffset.QuadPart; + request->EncryptedLength = intersectLength; + } } else { @@ -551,7 +822,13 @@ NTSTATUS EncryptedIoQueueAddIrp (Encrypt goto err; } - //Dump ("Queue irp %p out=%d\n", irp, queue->OutstandingIoCount); +#ifdef TC_TRACE_IO_QUEUE + { + PIO_STACK_LOCATION irpSp = IoGetCurrentIrpStackLocation (irp); + Dump ("* %I64d [%I64d] %c len=%d out=%d\n", irpSp->MajorFunction == IRP_MJ_WRITE ? irpSp->Parameters.Write.ByteOffset : irpSp->Parameters.Read.ByteOffset, GetElapsedTime (&queue->LastPerformanceCounter), irpSp->MajorFunction == IRP_MJ_WRITE ? 'W' : 'R', irpSp->MajorFunction == IRP_MJ_WRITE ? irpSp->Parameters.Write.Length : irpSp->Parameters.Read.Length, queue->OutstandingIoCount); + } +#endif + IoMarkIrpPending (irp); ExInterlockedInsertTailList (&queue->MainThreadQueue, &irp->Tail.Overlay.ListEntry, &queue->MainThreadQueueLock); @@ -585,7 +862,17 @@ NTSTATUS EncryptedIoQueueHoldWhenIdle (E status = STATUS_UNSUCCESSFUL; if (!NT_SUCCESS (status)) + { + queue->SuspendPending = FALSE; return status; + } + + TCSleep (1); + if (InterlockedExchangeAdd (&queue->OutstandingIoCount, 0) > 0) + { + queue->SuspendPending = FALSE; + return STATUS_UNSUCCESSFUL; + } } KeClearEvent (&queue->QueueResumedEvent); @@ -596,12 +883,11 @@ NTSTATUS EncryptedIoQueueHoldWhenIdle (E queue->Suspended = FALSE; KeSetEvent (&queue->QueueResumedEvent, IO_DISK_INCREMENT, FALSE); - } - queue->SuspendPending = FALSE; - //Dump ("Queue suspended out=%d\n", queue->OutstandingIoCount); + queue->ReadAheadBufferValid = FALSE; + queue->SuspendPending = FALSE; return STATUS_SUCCESS; } @@ -625,19 +911,28 @@ NTSTATUS EncryptedIoQueueResumeFromHold queue->Suspended = FALSE; KeSetEvent (&queue->QueueResumedEvent, IO_DISK_INCREMENT, FALSE); - //Dump ("Queue resumed out=%d\n", queue->OutstandingIoCount); - return STATUS_SUCCESS; } -NTSTATUS EncryptedIoQueueStart (EncryptedIoQueue *queue, PEPROCESS process) +NTSTATUS EncryptedIoQueueStart (EncryptedIoQueue *queue) { NTSTATUS status; + EncryptedIoQueueBuffer *buffer; + int i; + + queue->StartPending = TRUE; queue->ThreadExitRequested = FALSE; + queue->OutstandingIoCount = 0; + queue->IoThreadPendingRequestCount = 0; + + queue->FirstPoolBuffer = NULL; + KeInitializeMutex (&queue->BufferPoolMutex, 0); + KeInitializeEvent (&queue->NoOutstandingIoEvent, SynchronizationEvent, FALSE); KeInitializeEvent (&queue->RequestCompletedEvent, SynchronizationEvent, FALSE); + KeInitializeEvent (&queue->PoolBufferFreeEvent, SynchronizationEvent, FALSE); KeInitializeEvent (&queue->QueueResumedEvent, SynchronizationEvent, FALSE); queue->FragmentBufferA = TCalloc (TC_ENC_IO_QUEUE_MAX_FRAGMENT_SIZE); @@ -651,6 +946,26 @@ NTSTATUS EncryptedIoQueueStart (Encrypte KeInitializeEvent (&queue->FragmentBufferAFreeEvent, SynchronizationEvent, TRUE); KeInitializeEvent (&queue->FragmentBufferBFreeEvent, SynchronizationEvent, TRUE); + queue->ReadAheadBufferValid = FALSE; + queue->ReadAheadBuffer = TCalloc (TC_ENC_IO_QUEUE_MAX_FRAGMENT_SIZE); + if (!queue->ReadAheadBuffer) + goto noMemory; + + // Preallocate buffers + for (i = 0; i < TC_ENC_IO_QUEUE_PREALLOCATED_IO_REQUEST_COUNT; ++i) + { + if (i < TC_ENC_IO_QUEUE_PREALLOCATED_ITEM_COUNT && !GetPoolBuffer (queue, sizeof (EncryptedIoQueueItem))) + goto noMemory; + + if (!GetPoolBuffer (queue, sizeof (EncryptedIoRequest))) + goto noMemory; + } + + for (buffer = queue->FirstPoolBuffer; buffer != NULL; buffer = buffer->NextBuffer) + { + buffer->InUse = FALSE; + } + // Main thread InitializeListHead (&queue->MainThreadQueue); KeInitializeSpinLock (&queue->MainThreadQueueLock); @@ -665,7 +980,7 @@ NTSTATUS EncryptedIoQueueStart (Encrypte KeInitializeSpinLock (&queue->IoThreadQueueLock); KeInitializeEvent (&queue->IoThreadQueueNotEmptyEvent, SynchronizationEvent, FALSE); - status = TCStartThreadInProcess (IoThreadProc, queue, &queue->IoThread, process); + status = TCStartThread (IoThreadProc, queue, &queue->IoThread); if (!NT_SUCCESS (status)) { queue->ThreadExitRequested = TRUE; @@ -687,7 +1002,13 @@ NTSTATUS EncryptedIoQueueStart (Encrypte goto err; } +#ifdef TC_TRACE_IO_QUEUE + GetElapsedTimeInit (&queue->LastPerformanceCounter); +#endif + queue->StopPending = FALSE; + queue->StartPending = FALSE; + Dump ("Queue started\n"); return STATUS_SUCCESS; @@ -700,6 +1021,9 @@ err: if (queue->FragmentBufferB) TCfree (queue->FragmentBufferB); + FreePoolBuffers (queue); + + queue->StartPending = FALSE; return status; } @@ -724,6 +1048,9 @@ NTSTATUS EncryptedIoQueueStop (Encrypted TCfree (queue->FragmentBufferA); TCfree (queue->FragmentBufferB); + TCfree (queue->ReadAheadBuffer); + + FreePoolBuffers (queue); Dump ("Queue stopped out=%d\n", queue->OutstandingIoCount); return STATUS_SUCCESS;