--- /dev/null
+/*
+* COPYRIGHT: See COPYING in the top level directory
+* PROJECT: ReactOS kernel
+* FILE: drivers/filesystems/npfs/rw.c
+* PURPOSE: Named pipe filesystem
+* PROGRAMMER: David Welch <welch@cwcom.net>
+* Michael Martin
+*/
+
+/* INCLUDES ******************************************************************/
+
+#include "npfs.h"
+
+#define NDEBUG
+#include <debug.h>
+
+/* FUNCTIONS *****************************************************************/
+
+VOID HexDump(PUCHAR Buffer, ULONG Length)
+{
+ CHAR Line[65];
+ UCHAR ch;
+ const char Hex[] = "0123456789ABCDEF";
+ ULONG i, j;
+
+ DbgPrint("---------------\n");
+
+ for (i = 0; i < Length; i+= 16)
+ {
+ memset(Line, ' ', 64);
+ Line[64] = 0;
+
+ for (j = 0; j < 16 && j + i < Length; j++)
+ {
+ ch = Buffer[i + j];
+ Line[3*j + 0] = Hex[ch >> 4];
+ Line[3*j + 1] = Hex[ch & 0x0f];
+ Line[48 + j] = isprint(ch) ? ch : '.';
+ }
+ DbgPrint("%s\n", Line);
+ }
+ DbgPrint("---------------\n");
+}
+
+static DRIVER_CANCEL NpfsReadWriteCancelRoutine;
+static VOID NTAPI
+NpfsReadWriteCancelRoutine(IN PDEVICE_OBJECT DeviceObject,
+ IN PIRP Irp)
+{
+ PNPFS_CONTEXT Context;
+ PIO_STACK_LOCATION IoStack;
+ PNPFS_VCB Vcb;
+ PNPFS_CCB Ccb;
+ PLIST_ENTRY ListEntry;
+ PNPFS_THREAD_CONTEXT ThreadContext;
+ ULONG i;
+
+ DPRINT("NpfsReadWriteCancelRoutine(DeviceObject %p, Irp %p)\n", DeviceObject, Irp);
+
+ IoReleaseCancelSpinLock(Irp->CancelIrql);
+
+ Context = (PNPFS_CONTEXT)&Irp->Tail.Overlay.DriverContext;
+ Vcb = (PNPFS_VCB)DeviceObject->DeviceExtension;
+ IoStack = IoGetCurrentIrpStackLocation(Irp);
+ Ccb = IoStack->FileObject->FsContext2;
+
+ KeLockMutex(&Vcb->PipeListLock);
+ ExAcquireFastMutex(&Ccb->DataListLock);
+ switch(IoStack->MajorFunction)
+ {
+ case IRP_MJ_READ:
+ ListEntry = Vcb->ThreadListHead.Flink;
+ while (ListEntry != &Vcb->ThreadListHead)
+ {
+ ThreadContext = CONTAINING_RECORD(ListEntry, NPFS_THREAD_CONTEXT, ListEntry);
+ /* Real events start at index 1 */
+ for (i = 1; i < ThreadContext->Count; i++)
+ {
+ if (ThreadContext->WaitIrpArray[i] == Irp)
+ {
+ ASSERT(ThreadContext->WaitObjectArray[i] == Context->WaitEvent);
+
+ ThreadContext->WaitIrpArray[i] = NULL;
+
+ RemoveEntryList(&Context->ListEntry);
+
+ Irp->IoStatus.Status = STATUS_CANCELLED;
+ Irp->IoStatus.Information = 0;
+
+ IoCompleteRequest(Irp, IO_NO_INCREMENT);
+
+ KeSetEvent(&ThreadContext->Event, IO_NO_INCREMENT, FALSE);
+
+ ExReleaseFastMutex(&Ccb->DataListLock);
+ KeUnlockMutex(&Vcb->PipeListLock);
+
+ return;
+ }
+ }
+ ListEntry = ListEntry->Flink;
+ }
+
+ RemoveEntryList(&Context->ListEntry);
+
+ ExReleaseFastMutex(&Ccb->DataListLock);
+ KeUnlockMutex(&Vcb->PipeListLock);
+
+ Irp->IoStatus.Status = STATUS_CANCELLED;
+ Irp->IoStatus.Information = 0;
+
+ IoCompleteRequest(Irp, IO_NO_INCREMENT);
+ break;
+ default:
+ ASSERT(FALSE);
+ }
+}
+
+static KSTART_ROUTINE NpfsWaiterThread;
+static VOID NTAPI
+NpfsWaiterThread(PVOID InitContext)
+{
+ PNPFS_THREAD_CONTEXT ThreadContext = InitContext;
+ ULONG CurrentCount;
+ ULONG Count = 0, i;
+ PIRP Irp = NULL;
+ NTSTATUS Status;
+ PIO_STACK_LOCATION IoStack = NULL;
+ KIRQL OldIrql;
+
+ KeLockMutex(&ThreadContext->Vcb->PipeListLock);
+
+ while (1)
+ {
+ CurrentCount = ThreadContext->Count;
+ KeUnlockMutex(&ThreadContext->Vcb->PipeListLock);
+ IoAcquireCancelSpinLock(&OldIrql);
+ if (Irp && IoSetCancelRoutine(Irp, NULL) != NULL)
+ {
+ IoReleaseCancelSpinLock(OldIrql);
+ IoStack = IoGetCurrentIrpStackLocation(Irp);
+ switch (IoStack->MajorFunction)
+ {
+ case IRP_MJ_READ:
+ NpfsRead(IoStack->DeviceObject, Irp);
+ break;
+ default:
+ ASSERT(FALSE);
+ }
+ }
+ else
+ {
+ IoReleaseCancelSpinLock(OldIrql);
+ }
+ Status = KeWaitForMultipleObjects(CurrentCount,
+ ThreadContext->WaitObjectArray,
+ WaitAny,
+ Executive,
+ KernelMode,
+ FALSE,
+ NULL,
+ ThreadContext->WaitBlockArray);
+ if (!NT_SUCCESS(Status))
+ {
+ ASSERT(FALSE);
+ }
+ KeLockMutex(&ThreadContext->Vcb->PipeListLock);
+ Count = Status - STATUS_WAIT_0;
+ ASSERT (Count < CurrentCount);
+ if (Count > 0)
+ {
+ Irp = ThreadContext->WaitIrpArray[Count];
+ ThreadContext->Count--;
+ ThreadContext->Vcb->EmptyWaiterCount++;
+ ThreadContext->WaitObjectArray[Count] = ThreadContext->WaitObjectArray[ThreadContext->Count];
+ ThreadContext->WaitIrpArray[Count] = ThreadContext->WaitIrpArray[ThreadContext->Count];
+ }
+ else
+ {
+ /* someone has added a new wait request or cancelled an old one */
+ Irp = NULL;
+
+ /* Look for cancelled requests */
+ for (i = 1; i < ThreadContext->Count; i++)
+ {
+ if (ThreadContext->WaitIrpArray[i] == NULL)
+ {
+ ThreadContext->Count--;
+ ThreadContext->Vcb->EmptyWaiterCount++;
+ ThreadContext->WaitObjectArray[i] = ThreadContext->WaitObjectArray[ThreadContext->Count];
+ ThreadContext->WaitIrpArray[i] = ThreadContext->WaitIrpArray[ThreadContext->Count];
+ }
+ }
+ }
+ if (ThreadContext->Count == 1 && ThreadContext->Vcb->EmptyWaiterCount >= MAXIMUM_WAIT_OBJECTS)
+ {
+ /* there is another thread with empty wait slots, we can remove our thread from the list */
+ ASSERT(Irp == NULL);
+ ThreadContext->Vcb->EmptyWaiterCount -= MAXIMUM_WAIT_OBJECTS - 1;
+ RemoveEntryList(&ThreadContext->ListEntry);
+ KeUnlockMutex(&ThreadContext->Vcb->PipeListLock);
+ ExFreePoolWithTag(ThreadContext, TAG_NPFS_THREAD_CONTEXT);
+ break;
+ }
+ }
+}
+
+static NTSTATUS
+NpfsAddWaitingReadWriteRequest(IN PDEVICE_OBJECT DeviceObject,
+ IN PIRP Irp)
+{
+ PLIST_ENTRY ListEntry;
+ PNPFS_THREAD_CONTEXT ThreadContext = NULL;
+ PNPFS_CONTEXT Context;
+ HANDLE hThread;
+ PNPFS_VCB Vcb;
+ KIRQL oldIrql;
+ NTSTATUS Status;
+
+ Context = (PNPFS_CONTEXT)&Irp->Tail.Overlay.DriverContext;
+ Vcb = (PNPFS_VCB)DeviceObject->DeviceExtension;
+
+ DPRINT("NpfsAddWaitingReadWriteRequest(DeviceObject %p, Irp %p)\n", DeviceObject, Irp);
+
+ KeLockMutex(&Vcb->PipeListLock);
+
+ ListEntry = Vcb->ThreadListHead.Flink;
+ while (ListEntry != &Vcb->ThreadListHead)
+ {
+ ThreadContext = CONTAINING_RECORD(ListEntry, NPFS_THREAD_CONTEXT, ListEntry);
+ if (ThreadContext->Count < MAXIMUM_WAIT_OBJECTS)
+ {
+ break;
+ }
+ ListEntry = ListEntry->Flink;
+ }
+
+ if (ListEntry == &Vcb->ThreadListHead)
+ {
+ ThreadContext = ExAllocatePoolWithTag(NonPagedPool,
+ sizeof(NPFS_THREAD_CONTEXT),
+ TAG_NPFS_THREAD_CONTEXT);
+ if (ThreadContext == NULL)
+ {
+ KeUnlockMutex(&Vcb->PipeListLock);
+ return STATUS_NO_MEMORY;
+ }
+
+ ThreadContext->Vcb = Vcb;
+ KeInitializeEvent(&ThreadContext->Event, SynchronizationEvent, FALSE);
+ ThreadContext->Count = 1;
+ ThreadContext->WaitObjectArray[0] = &ThreadContext->Event;
+
+ DPRINT("Creating a new system thread for waiting read/write requests\n");
+
+ Status = PsCreateSystemThread(&hThread,
+ THREAD_ALL_ACCESS,
+ NULL,
+ NULL,
+ NULL,
+ NpfsWaiterThread,
+ (PVOID)ThreadContext);
+ if (!NT_SUCCESS(Status))
+ {
+ ExFreePoolWithTag(ThreadContext, TAG_NPFS_THREAD_CONTEXT);
+ KeUnlockMutex(&Vcb->PipeListLock);
+ return Status;
+ }
+
+ InsertHeadList(&Vcb->ThreadListHead, &ThreadContext->ListEntry);
+ Vcb->EmptyWaiterCount += MAXIMUM_WAIT_OBJECTS - 1;
+ }
+ IoMarkIrpPending(Irp);
+
+ IoAcquireCancelSpinLock(&oldIrql);
+ if (Irp->Cancel)
+ {
+ IoReleaseCancelSpinLock(oldIrql);
+ Status = STATUS_CANCELLED;
+ }
+ else
+ {
+ (void)IoSetCancelRoutine(Irp, NpfsReadWriteCancelRoutine);
+ IoReleaseCancelSpinLock(oldIrql);
+ ThreadContext->WaitObjectArray[ThreadContext->Count] = Context->WaitEvent;
+ ThreadContext->WaitIrpArray[ThreadContext->Count] = Irp;
+ ThreadContext->Count++;
+ Vcb->EmptyWaiterCount--;
+ KeSetEvent(&ThreadContext->Event, IO_NO_INCREMENT, FALSE);
+ Status = STATUS_SUCCESS;
+ }
+ KeUnlockMutex(&Vcb->PipeListLock);
+ return Status;
+}
+
+NTSTATUS NTAPI
+NpfsRead(IN PDEVICE_OBJECT DeviceObject,
+ IN PIRP Irp)
+{
+ PFILE_OBJECT FileObject;
+ NTSTATUS Status;
+ NTSTATUS OriginalStatus = STATUS_SUCCESS;
+ PNPFS_CCB Ccb;
+ PNPFS_CONTEXT Context;
+ KEVENT Event;
+ ULONG Length;
+ ULONG Information = 0;
+ ULONG CopyLength = 0;
+ ULONG TempLength;
+ BOOLEAN IsOriginalRequest = TRUE;
+ PVOID Buffer;
+
+ DPRINT("NpfsRead(DeviceObject %p, Irp %p)\n", DeviceObject, Irp);
+
+ FileObject = IoGetCurrentIrpStackLocation(Irp)->FileObject;
+ DPRINT("FileObject %p\n", FileObject);
+ DPRINT("Pipe name %wZ\n", &FileObject->FileName);
+ Ccb = FileObject->FsContext2;
+
+ /* Fail, if the CCB is not a pipe CCB */
+ if (Ccb->Type != CCB_PIPE)
+ {
+ DPRINT("Not a pipe!\n");
+ Status = STATUS_INVALID_PARAMETER;
+ Irp->IoStatus.Information = 0;
+ goto done;
+ }
+
+ if (Irp->MdlAddress == NULL)
+ {
+ DPRINT("Irp->MdlAddress == NULL\n");
+ Status = STATUS_UNSUCCESSFUL;
+ Irp->IoStatus.Information = 0;
+ goto done;
+ }
+
+ Context = (PNPFS_CONTEXT)&Irp->Tail.Overlay.DriverContext;
+
+ if ((Ccb->OtherSide) && (Ccb->OtherSide->PipeState == FILE_PIPE_DISCONNECTED_STATE) && (Ccb->PipeState == FILE_PIPE_DISCONNECTED_STATE))
+ {
+ DPRINT("Both Client and Server are disconnected!\n");
+ Status = STATUS_PIPE_DISCONNECTED;
+ Irp->IoStatus.Information = 0;
+ goto done;
+
+ }
+
+ if ((Ccb->OtherSide == NULL) && (Ccb->ReadDataAvailable == 0))
+ {
+ if (Ccb->PipeState == FILE_PIPE_CONNECTED_STATE)
+ Status = STATUS_PIPE_BROKEN;
+ else if (Ccb->PipeState == FILE_PIPE_LISTENING_STATE)
+ Status = STATUS_PIPE_LISTENING;
+ else if (Ccb->PipeState == FILE_PIPE_DISCONNECTED_STATE)
+ Status = STATUS_PIPE_DISCONNECTED;
+ else
+ Status = STATUS_UNSUCCESSFUL;
+ Irp->IoStatus.Information = 0;
+ goto done;
+ }
+
+ if (Ccb->Data == NULL)
+ {
+ DPRINT("Pipe is NOT readable!\n");
+ Status = STATUS_UNSUCCESSFUL;
+ Irp->IoStatus.Information = 0;
+ goto done;
+ }
+
+ ExAcquireFastMutex(&Ccb->DataListLock);
+
+ if (IoIsOperationSynchronous(Irp))
+ {
+ InsertTailList(&Ccb->ReadRequestListHead, &Context->ListEntry);
+ if (Ccb->ReadRequestListHead.Flink != &Context->ListEntry)
+ {
+ KeInitializeEvent(&Event, SynchronizationEvent, FALSE);
+ Context->WaitEvent = &Event;
+ ExReleaseFastMutex(&Ccb->DataListLock);
+ KeWaitForSingleObject(&Event,
+ Executive,
+ KernelMode,
+ FALSE,
+ NULL);
+ ExAcquireFastMutex(&Ccb->DataListLock);
+ }
+ Irp->IoStatus.Information = 0;
+ }
+ else
+ {
+ KIRQL oldIrql;
+ if (IsListEmpty(&Ccb->ReadRequestListHead) ||
+ Ccb->ReadRequestListHead.Flink != &Context->ListEntry)
+ {
+ /* this is a new request */
+ Irp->IoStatus.Information = 0;
+ KeResetEvent(&Ccb->ReadEvent);
+ Context->WaitEvent = &Ccb->ReadEvent;
+ InsertTailList(&Ccb->ReadRequestListHead, &Context->ListEntry);
+ if (Ccb->ReadRequestListHead.Flink != &Context->ListEntry)
+ {
+ /* there was already a request on the list */
+ IoAcquireCancelSpinLock(&oldIrql);
+ if (Irp->Cancel)
+ {
+ IoReleaseCancelSpinLock(oldIrql);
+ RemoveEntryList(&Context->ListEntry);
+ ExReleaseFastMutex(&Ccb->DataListLock);
+ Status = STATUS_CANCELLED;
+ goto done;
+ }
+ (void)IoSetCancelRoutine(Irp, NpfsReadWriteCancelRoutine);
+ IoReleaseCancelSpinLock(oldIrql);
+ ExReleaseFastMutex(&Ccb->DataListLock);
+ IoMarkIrpPending(Irp);
+ Status = STATUS_PENDING;
+ goto done;
+ }
+ }
+ }
+
+ while (1)
+ {
+ Buffer = MmGetSystemAddressForMdlSafe(Irp->MdlAddress,
+ NormalPagePriority);
+ Information = Irp->IoStatus.Information;
+ Length = IoGetCurrentIrpStackLocation(Irp)->Parameters.Read.Length;
+ ASSERT(Information <= Length);
+ Buffer = (PVOID)((ULONG_PTR)Buffer + Information);
+ Length -= Information;
+ Status = STATUS_SUCCESS;
+
+ while (1)
+ {
+ if (Ccb->ReadDataAvailable == 0)
+ {
+ ULONG ConnectionSideReadMode;
+
+ if (Ccb->PipeEnd == FILE_PIPE_CLIENT_END) ConnectionSideReadMode=Ccb->Fcb->ClientReadMode;
+ else ConnectionSideReadMode = Ccb->Fcb->ServerReadMode;
+
+ if ((Ccb->PipeState == FILE_PIPE_CONNECTED_STATE) && (Ccb->OtherSide))
+ {
+ KeSetEvent(&Ccb->OtherSide->WriteEvent, IO_NO_INCREMENT, FALSE);
+ }
+ if (Information > 0 &&
+ (ConnectionSideReadMode != FILE_PIPE_BYTE_STREAM_MODE ||
+ Ccb->PipeState != FILE_PIPE_CONNECTED_STATE))
+ {
+ break;
+ }
+ ASSERT(Ccb->ReadDataAvailable == 0);
+ if ((Ccb->PipeState != FILE_PIPE_CONNECTED_STATE) || (!Ccb->OtherSide))
+ {
+ DPRINT("PipeState: %x\n", Ccb->PipeState);
+ Status = STATUS_PIPE_BROKEN;
+ break;
+ }
+ KeResetEvent(&Ccb->ReadEvent);
+ ExReleaseFastMutex(&Ccb->DataListLock);
+
+ if (IoIsOperationSynchronous(Irp))
+ {
+ /* Wait for ReadEvent to become signaled */
+
+ DPRINT("Waiting for readable data (%wZ)\n", &Ccb->Fcb->PipeName);
+ Status = KeWaitForSingleObject(&Ccb->ReadEvent,
+ UserRequest,
+ Irp->RequestorMode,
+ (FileObject->Flags & FO_ALERTABLE_IO) != 0,
+ NULL);
+ DPRINT("Finished waiting (%wZ)! Status: %lx\n", &Ccb->Fcb->PipeName, Status);
+
+ ExAcquireFastMutex(&Ccb->DataListLock);
+
+ if ((Status == STATUS_USER_APC) || (Status == STATUS_KERNEL_APC) || (Status == STATUS_ALERTED))
+ {
+ Status = STATUS_CANCELLED;
+ break;
+ }
+ if (!NT_SUCCESS(Status))
+ {
+ ASSERT(FALSE);
+ }
+ }
+ else
+ {
+ Context = (PNPFS_CONTEXT)&Irp->Tail.Overlay.DriverContext;
+
+ Context->WaitEvent = &Ccb->ReadEvent;
+ Status = NpfsAddWaitingReadWriteRequest(DeviceObject, Irp);
+
+ if (NT_SUCCESS(Status))
+ {
+ Status = STATUS_PENDING;
+ goto done;
+ }
+ ExAcquireFastMutex(&Ccb->DataListLock);
+ break;
+ }
+ }
+ ASSERT(IoGetCurrentIrpStackLocation(Irp)->FileObject != NULL);
+
+ /* If the pipe type and read mode are both byte stream */
+ if (Ccb->Fcb->PipeType == FILE_PIPE_BYTE_STREAM_TYPE)
+ {
+ DPRINT("Byte stream mode: Ccb->Data %p\n", Ccb->Data);
+ /* Byte stream mode */
+ while (Length > 0 && Ccb->ReadDataAvailable > 0)
+ {
+ CopyLength = min(Ccb->ReadDataAvailable, Length);
+ if ((ULONG_PTR)Ccb->ReadPtr + CopyLength <= (ULONG_PTR)Ccb->Data + Ccb->MaxDataLength)
+ {
+ memcpy(Buffer, Ccb->ReadPtr, CopyLength);
+ Ccb->ReadPtr = (PVOID)((ULONG_PTR)Ccb->ReadPtr + CopyLength);
+ if (Ccb->ReadPtr == (PVOID)((ULONG_PTR)Ccb->Data + Ccb->MaxDataLength))
+ {
+ Ccb->ReadPtr = Ccb->Data;
+ }
+ }
+ else
+ {
+ TempLength = (ULONG)((ULONG_PTR)Ccb->Data + Ccb->MaxDataLength - (ULONG_PTR)Ccb->ReadPtr);
+ memcpy(Buffer, Ccb->ReadPtr, TempLength);
+ memcpy((PVOID)((ULONG_PTR)Buffer + TempLength), Ccb->Data, CopyLength - TempLength);
+ Ccb->ReadPtr = (PVOID)((ULONG_PTR)Ccb->Data + CopyLength - TempLength);
+ }
+
+ Buffer = (PVOID)((ULONG_PTR)Buffer + CopyLength);
+ Length -= CopyLength;
+ Information += CopyLength;
+
+ Ccb->ReadDataAvailable -= CopyLength;
+ Ccb->WriteQuotaAvailable += CopyLength;
+ }
+
+ if ((Length == 0) || (Ccb->ReadDataAvailable == 0))
+ {
+ if ((Ccb->PipeState == FILE_PIPE_CONNECTED_STATE) && (Ccb->OtherSide))
+ {
+ KeSetEvent(&Ccb->OtherSide->WriteEvent, IO_NO_INCREMENT, FALSE);
+ }
+ break;
+ }
+ }
+ else if (Ccb->Fcb->PipeType == FILE_PIPE_MESSAGE_TYPE)
+ {
+ DPRINT("Message mode: Ccb>Data %p\n", Ccb->Data);
+
+ /* Check if buffer is full and the read pointer is not at the start of the buffer */
+ if ((Ccb->WriteQuotaAvailable == 0) && (Ccb->ReadPtr > Ccb->Data))
+ {
+ Ccb->WriteQuotaAvailable += (ULONG_PTR)Ccb->ReadPtr - (ULONG_PTR)Ccb->Data;
+ memcpy(Ccb->Data, Ccb->ReadPtr, (ULONG_PTR)Ccb->WritePtr - (ULONG_PTR)Ccb->ReadPtr);
+ Ccb->WritePtr = (PVOID)((ULONG_PTR)Ccb->WritePtr - ((ULONG_PTR)Ccb->ReadPtr - (ULONG_PTR)Ccb->Data));
+ Ccb->ReadPtr = Ccb->Data;
+ ASSERT((ULONG_PTR)Ccb->WritePtr < ((ULONG_PTR)Ccb->Data + Ccb->MaxDataLength));
+ ASSERT(Ccb->WritePtr >= Ccb->Data);
+ }
+
+ /* For Message mode, the Message length is stored in the buffer preceeding the Message. */
+ if (Ccb->ReadDataAvailable)
+ {
+ ULONG NextMessageLength = 0;
+
+ /* First get the size of the message */
+ memcpy(&NextMessageLength, Ccb->ReadPtr, sizeof(NextMessageLength));
+
+ if ((NextMessageLength == 0) || (NextMessageLength > Ccb->ReadDataAvailable))
+ {
+ DPRINT1("Possible memory corruption.\n");
+ HexDump(Ccb->Data, (ULONG_PTR)Ccb->WritePtr - (ULONG_PTR)Ccb->Data);
+ ASSERT(FALSE);
+ }
+
+ /* Use the smaller value */
+ CopyLength = min(NextMessageLength, Length);
+ ASSERT(CopyLength > 0);
+ ASSERT(CopyLength <= Ccb->ReadDataAvailable);
+ /* retrieve the message from the buffer */
+ memcpy(Buffer, (PVOID)((ULONG_PTR)Ccb->ReadPtr + sizeof(NextMessageLength)), CopyLength);
+
+ if (Ccb->ReadDataAvailable > CopyLength)
+ {
+ if (CopyLength < NextMessageLength)
+ /* Client only requested part of the message */
+ {
+ /* Calculate the remaining message new size */
+ ULONG NewMessageSize = NextMessageLength - CopyLength;
+
+ /* Update ReadPtr to point to new Message size location */
+ Ccb->ReadPtr = (PVOID)((ULONG_PTR)Ccb->ReadPtr + CopyLength);
+
+ /* Write a new Message size to buffer for the part of the message still there */
+ memcpy(Ccb->ReadPtr, &NewMessageSize, sizeof(NewMessageSize));
+ }
+ else
+ /* Client wanted the entire message */
+ {
+ /* Update ReadPtr to point to next message size */
+ Ccb->ReadPtr = (PVOID)((ULONG_PTR)Ccb->ReadPtr + CopyLength + sizeof(CopyLength));
+ }
+ }
+ else
+ {
+ /* This was the last Message, so just zero start of buffer for safety sake */
+ memset(Ccb->Data, 0, NextMessageLength + sizeof(NextMessageLength));
+
+ /* Reset to MaxDataLength as partial message retrievals dont
+ give the length back to Quota */
+ Ccb->WriteQuotaAvailable = Ccb->MaxDataLength;
+
+ /* reset read and write pointer to beginning of buffer */
+ Ccb->WritePtr = Ccb->Data;
+ Ccb->ReadPtr = Ccb->Data;
+ }
+#ifndef NDEBUG
+ DPRINT("Length %d Buffer %x\n", CopyLength, Buffer);
+ HexDump((PUCHAR)Buffer, CopyLength);
+#endif
+
+ Information += CopyLength;
+
+ Ccb->ReadDataAvailable -= CopyLength;
+
+ ASSERT(Ccb->WriteQuotaAvailable <= Ccb->MaxDataLength);
+ }
+
+ if (Information > 0)
+ {
+ ULONG ConnectionSideReadMode;
+
+ if (Ccb->PipeEnd == FILE_PIPE_CLIENT_END) ConnectionSideReadMode=Ccb->Fcb->ClientReadMode;
+ else ConnectionSideReadMode = Ccb->Fcb->ServerReadMode;
+
+ if ((ConnectionSideReadMode == FILE_PIPE_BYTE_STREAM_MODE) && (Ccb->ReadDataAvailable) && (Length > CopyLength))
+ {
+ Buffer = (PVOID)((ULONG_PTR)Buffer + CopyLength);
+ Length -= CopyLength;
+ }
+ else
+ {
+ if ((Ccb->PipeState == FILE_PIPE_CONNECTED_STATE) && (Ccb->WriteQuotaAvailable > 0) && (Ccb->OtherSide))
+ {
+ KeSetEvent(&Ccb->OtherSide->WriteEvent, IO_NO_INCREMENT, FALSE);
+ }
+ break;
+ }
+ }
+ }
+ else
+ {
+ DPRINT1("Unhandled Pipe Mode!\n");
+ ASSERT(FALSE);
+ }
+ }
+ Irp->IoStatus.Information = Information;
+ Irp->IoStatus.Status = Status;
+
+ ASSERT(IoGetCurrentIrpStackLocation(Irp)->FileObject != NULL);
+
+ if (IoIsOperationSynchronous(Irp))
+ {
+ RemoveEntryList(&Context->ListEntry);
+ if (!IsListEmpty(&Ccb->ReadRequestListHead))
+ {
+ Context = CONTAINING_RECORD(Ccb->ReadRequestListHead.Flink, NPFS_CONTEXT, ListEntry);
+ KeSetEvent(Context->WaitEvent, IO_NO_INCREMENT, FALSE);
+ }
+ ExReleaseFastMutex(&Ccb->DataListLock);
+ IoCompleteRequest(Irp, IO_NO_INCREMENT);
+
+ DPRINT("NpfsRead done (Status %lx)\n", Status);
+ return Status;
+ }
+ else
+ {
+ KIRQL oldIrql;
+
+ if (IsOriginalRequest)
+ {
+ IsOriginalRequest = FALSE;
+ OriginalStatus = Status;
+ }
+ if (Status == STATUS_PENDING)
+ {
+ ExReleaseFastMutex(&Ccb->DataListLock);
+ DPRINT("NpfsRead done (Status %lx)\n", OriginalStatus);
+ return OriginalStatus;
+ }
+ RemoveEntryList(&Context->ListEntry);
+ IoCompleteRequest(Irp, IO_NO_INCREMENT);
+ if (IsListEmpty(&Ccb->ReadRequestListHead))
+ {
+ ExReleaseFastMutex(&Ccb->DataListLock);
+ DPRINT("NpfsRead done (Status %lx)\n", OriginalStatus);
+ return OriginalStatus;
+ }
+
+ IoAcquireCancelSpinLock(&oldIrql);
+ Context = CONTAINING_RECORD(Ccb->ReadRequestListHead.Flink, NPFS_CONTEXT, ListEntry);
+
+ Irp = CONTAINING_RECORD(Context, IRP, Tail.Overlay.DriverContext);
+ /* Verify the Irp wasnt cancelled */
+ if (Irp->Cancel)
+ {
+ IoReleaseCancelSpinLock(oldIrql);
+ RemoveEntryList(&Context->ListEntry);
+ ExReleaseFastMutex(&Ccb->DataListLock);
+ Status = STATUS_CANCELLED;
+ goto done;
+ }
+ /* The Irp will now be handled, so remove the CancelRoutine */
+ (void)IoSetCancelRoutine(Irp, NULL);
+ IoReleaseCancelSpinLock(oldIrql);
+ }
+ }
+
+done:
+ Irp->IoStatus.Status = Status;
+
+ if (Status != STATUS_PENDING)
+ {
+ IoCompleteRequest(Irp, IO_NO_INCREMENT);
+ }
+ DPRINT("NpfsRead done (Status %lx)\n", Status);
+
+ return Status;
+}
+
+NTSTATUS NTAPI
+NpfsWrite(PDEVICE_OBJECT DeviceObject,
+ PIRP Irp)
+{
+ PIO_STACK_LOCATION IoStack;
+ PFILE_OBJECT FileObject;
+ PNPFS_FCB Fcb = NULL;
+ PNPFS_CCB Ccb = NULL;
+ PNPFS_CCB ReaderCcb;
+ PUCHAR Buffer;
+ NTSTATUS Status = STATUS_SUCCESS;
+ ULONG Length;
+ ULONG Offset;
+ ULONG Information = 0;
+ ULONG CopyLength;
+ ULONG TempLength;
+
+ UNREFERENCED_PARAMETER(DeviceObject);
+
+ DPRINT("NpfsWrite()\n");
+
+ IoStack = IoGetCurrentIrpStackLocation(Irp);
+ FileObject = IoStack->FileObject;
+ DPRINT("FileObject %p\n", FileObject);
+ DPRINT("Pipe name %wZ\n", &FileObject->FileName);
+
+ Ccb = FileObject->FsContext2;
+
+ /* Fail, if the CCB is not a pipe CCB */
+ if (Ccb->Type != CCB_PIPE)
+ {
+ DPRINT("Not a pipe!\n");
+ Status = STATUS_INVALID_PARAMETER;
+ Length = 0;
+ goto done;
+ }
+
+ ReaderCcb = Ccb->OtherSide;
+ Fcb = Ccb->Fcb;
+
+ Length = IoStack->Parameters.Write.Length;
+ Offset = IoStack->Parameters.Write.ByteOffset.u.LowPart;
+
+ if (Irp->MdlAddress == NULL)
+ {
+ DPRINT("Irp->MdlAddress == NULL\n");
+ Status = STATUS_UNSUCCESSFUL;
+ Length = 0;
+ goto done;
+ }
+
+ if ((ReaderCcb == NULL) || (Ccb->PipeState != FILE_PIPE_CONNECTED_STATE))
+ {
+ DPRINT("Pipe is NOT connected!\n");
+ if (Ccb->PipeState == FILE_PIPE_LISTENING_STATE)
+ Status = STATUS_PIPE_LISTENING;
+ else if (Ccb->PipeState == FILE_PIPE_DISCONNECTED_STATE)
+ Status = STATUS_PIPE_DISCONNECTED;
+ else
+ Status = STATUS_UNSUCCESSFUL;
+ Length = 0;
+ goto done;
+ }
+
+ if (ReaderCcb->Data == NULL)
+ {
+ DPRINT("Pipe is NOT writable!\n");
+ Status = STATUS_UNSUCCESSFUL;
+ Length = 0;
+ goto done;
+ }
+
+ Status = STATUS_SUCCESS;
+ Buffer = MmGetSystemAddressForMdlSafe(Irp->MdlAddress, NormalPagePriority);
+
+ if (!Buffer)
+ {
+ DPRINT("MmGetSystemAddressForMdlSafe failed\n");
+ Status = STATUS_INSUFFICIENT_RESOURCES;
+ Length = 0;
+ goto done;
+
+ }
+
+ ExAcquireFastMutex(&ReaderCcb->DataListLock);
+
+ DPRINT("Length %lu Buffer %p Offset %lu\n", Length, Buffer, Offset);
+
+#ifndef NDEBUG
+ HexDump(Buffer, Length);
+#endif
+
+ while (1)
+ {
+ if (ReaderCcb->WriteQuotaAvailable == 0)
+ {
+ if (Ccb->PipeState != FILE_PIPE_CONNECTED_STATE || !Ccb->OtherSide)
+ {
+ Status = STATUS_PIPE_BROKEN;
+ ExReleaseFastMutex(&ReaderCcb->DataListLock);
+ goto done;
+ }
+ KeSetEvent(&ReaderCcb->ReadEvent, IO_NO_INCREMENT, FALSE);
+ KeResetEvent(&Ccb->WriteEvent);
+ ExReleaseFastMutex(&ReaderCcb->DataListLock);
+
+ DPRINT("Write Waiting for buffer space (%wZ)\n", &Fcb->PipeName);
+ Status = KeWaitForSingleObject(&Ccb->WriteEvent,
+ UserRequest,
+ Irp->RequestorMode,
+ (FileObject->Flags & FO_ALERTABLE_IO) != 0,
+ NULL);
+ DPRINT("Write Finished waiting (%wZ)! Status: %lx\n", &Fcb->PipeName, Status);
+
+ if ((Status == STATUS_USER_APC) || (Status == STATUS_KERNEL_APC) || (Status == STATUS_ALERTED))
+ {
+ Status = STATUS_CANCELLED;
+ goto done;
+ }
+ if (!NT_SUCCESS(Status))
+ {
+ ASSERT(FALSE);
+ }
+ /*
+ * It's possible that the event was signaled because the
+ * other side of pipe was closed.
+ */
+ if (Ccb->PipeState != FILE_PIPE_CONNECTED_STATE || !Ccb->OtherSide)
+ {
+ DPRINT("PipeState: %lx\n", Ccb->PipeState);
+ Status = STATUS_PIPE_BROKEN;
+ goto done;
+ }
+ /* Check that the pipe has not been closed */
+ if (ReaderCcb->PipeState != FILE_PIPE_CONNECTED_STATE || !ReaderCcb->OtherSide)
+ {
+ Status = STATUS_PIPE_BROKEN;
+ goto done;
+ }
+ ExAcquireFastMutex(&ReaderCcb->DataListLock);
+ }
+
+ if (Ccb->Fcb->PipeType == FILE_PIPE_BYTE_STREAM_TYPE)
+ {
+ DPRINT("Byte stream mode: Ccb->Data %p, Ccb->WritePtr %p\n", ReaderCcb->Data, ReaderCcb->WritePtr);
+
+ while (Length > 0 && ReaderCcb->WriteQuotaAvailable > 0)
+ {
+ CopyLength = min(Length, ReaderCcb->WriteQuotaAvailable);
+
+ if ((ULONG_PTR)ReaderCcb->WritePtr + CopyLength <= (ULONG_PTR)ReaderCcb->Data + ReaderCcb->MaxDataLength)
+ {
+ memcpy(ReaderCcb->WritePtr, Buffer, CopyLength);
+ ReaderCcb->WritePtr = (PVOID)((ULONG_PTR)ReaderCcb->WritePtr + CopyLength);
+ if ((ULONG_PTR)ReaderCcb->WritePtr == (ULONG_PTR)ReaderCcb->Data + ReaderCcb->MaxDataLength)
+ {
+ ReaderCcb->WritePtr = ReaderCcb->Data;
+ }
+ }
+ else
+ {
+
+ TempLength = (ULONG)((ULONG_PTR)ReaderCcb->Data + ReaderCcb->MaxDataLength -
+ (ULONG_PTR)ReaderCcb->WritePtr);
+
+ memcpy(ReaderCcb->WritePtr, Buffer, TempLength);
+ memcpy(ReaderCcb->Data, Buffer + TempLength, CopyLength - TempLength);
+ ReaderCcb->WritePtr = (PVOID)((ULONG_PTR)ReaderCcb->Data + CopyLength - TempLength);
+ }
+
+ Buffer += CopyLength;
+ Length -= CopyLength;
+ Information += CopyLength;
+
+ ReaderCcb->ReadDataAvailable += CopyLength;
+ ReaderCcb->WriteQuotaAvailable -= CopyLength;
+ }
+
+ if (Length == 0)
+ {
+ KeSetEvent(&ReaderCcb->ReadEvent, IO_NO_INCREMENT, FALSE);
+ break;
+ }
+ }
+ else if (Ccb->Fcb->PipeType == FILE_PIPE_MESSAGE_TYPE)
+ {
+ /* For Message Type Pipe, the Pipes memory will be used to store the size of each message */
+ DPRINT("Message mode: Ccb->Data %p, Ccb->WritePtr %p\n", ReaderCcb->Data, ReaderCcb->WritePtr);
+ if (Length > 0)
+ {
+ /* Verify the WritePtr is still inside the buffer */
+ if (((ULONG_PTR)ReaderCcb->WritePtr > ((ULONG_PTR)ReaderCcb->Data + (ULONG_PTR)ReaderCcb->MaxDataLength)) ||
+ ((ULONG_PTR)ReaderCcb->WritePtr < (ULONG_PTR)ReaderCcb->Data))
+ {
+ DPRINT1("NPFS is writing out of its buffer. Report to developer!\n");
+ DPRINT1("ReaderCcb->WritePtr %p, ReaderCcb->Data %p, ReaderCcb->MaxDataLength %lu\n",
+ ReaderCcb->WritePtr, ReaderCcb->Data, ReaderCcb->MaxDataLength);
+ ASSERT(FALSE);
+ }
+
+ CopyLength = min(Length, ReaderCcb->WriteQuotaAvailable - sizeof(ULONG));
+ if (CopyLength > ReaderCcb->WriteQuotaAvailable)
+ {
+ DPRINT1("Writing %lu byte to pipe would overflow as only %lu bytes are available\n",
+ CopyLength, ReaderCcb->WriteQuotaAvailable);
+ ASSERT(FALSE);
+ }
+
+ /* First Copy the Length of the message into the pipes buffer */
+ memcpy(ReaderCcb->WritePtr, &CopyLength, sizeof(CopyLength));
+
+ /* Now the user buffer itself */
+ memcpy((PVOID)((ULONG_PTR)ReaderCcb->WritePtr + sizeof(CopyLength)), Buffer, CopyLength);
+
+ /* Update the write pointer */
+ ReaderCcb->WritePtr = (PVOID)((ULONG_PTR)ReaderCcb->WritePtr + sizeof(CopyLength) + CopyLength);
+
+ Information += CopyLength;
+
+ ReaderCcb->ReadDataAvailable += CopyLength;
+
+ ReaderCcb->WriteQuotaAvailable -= (CopyLength + sizeof(ULONG));
+
+ if ((ULONG_PTR)ReaderCcb->WriteQuotaAvailable > (ULONG)ReaderCcb->MaxDataLength)
+ {
+ DPRINT1("QuotaAvailable is greater than buffer size!\n");
+ ASSERT(FALSE);
+ }
+ }
+
+ if (Information > 0)
+ {
+ KeSetEvent(&ReaderCcb->ReadEvent, IO_NO_INCREMENT, FALSE);
+ break;
+ }
+ }
+ else
+ {
+ DPRINT1("Unhandled Pipe Type Mode and Read Write Mode!\n");
+ ASSERT(FALSE);
+ }
+ }
+
+ ExReleaseFastMutex(&ReaderCcb->DataListLock);
+
+done:
+ Irp->IoStatus.Status = Status;
+ Irp->IoStatus.Information = Information;
+
+ IoCompleteRequest(Irp, IO_NO_INCREMENT);
+
+ DPRINT("NpfsWrite done (Status %lx)\n", Status);
+
+ return Status;
+}
+
+/* EOF */
projects / reactos.git / blobdiff