--- /dev/null
+/*
+ * PROJECT: ReactOS Drivers
+ * LICENSE: GPL - See COPYING in the top level directory
+ * FILE: drivers/filesystems/npfs/rw.c
+ * PURPOSE: Named pipe filesystem
+ * PROGRAMMERS:
+ */
+
+/* INCLUDES ******************************************************************/
+
+#include "npfs.h"
+
+//#define NDEBUG
+#include <debug.h>
+
+/* FUNCTIONS *****************************************************************/
+
+#ifndef NDEBUG
+VOID HexDump(PUCHAR Buffer, ULONG Length)
+{
+ CHAR Line[65];
+ UCHAR ch;
+ const char Hex[] = "0123456789ABCDEF";
+ int 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");
+}
+#endif
+
+static VOID STDCALL
+NpfsReadWriteCancelRoutine(IN PDEVICE_OBJECT DeviceObject,
+ IN PIRP Irp)
+{
+ PNPFS_CONTEXT Context;
+ PNPFS_DEVICE_EXTENSION DeviceExt;
+ PIO_STACK_LOCATION IoStack;
+ PNPFS_CCB Ccb;
+ BOOLEAN Complete = FALSE;
+
+ DPRINT("NpfsReadWriteCancelRoutine(DeviceObject %x, Irp %x)\n", DeviceObject, Irp);
+
+ IoReleaseCancelSpinLock(Irp->CancelIrql);
+
+ Context = (PNPFS_CONTEXT)&Irp->Tail.Overlay.DriverContext;
+ DeviceExt = (PNPFS_DEVICE_EXTENSION)DeviceObject->DeviceExtension;
+ IoStack = IoGetCurrentIrpStackLocation(Irp);
+ Ccb = IoStack->FileObject->FsContext2;
+
+ KeLockMutex(&DeviceExt->PipeListLock);
+ ExAcquireFastMutex(&Ccb->DataListLock);
+ switch(IoStack->MajorFunction)
+ {
+ case IRP_MJ_READ:
+ if (Ccb->ReadRequestListHead.Flink != &Context->ListEntry)
+ {
+ /* we are not the first in the list, remove an complete us */
+ RemoveEntryList(&Context->ListEntry);
+ Complete = TRUE;
+ }
+ else
+ {
+ KeSetEvent(&Ccb->ReadEvent, IO_NO_INCREMENT, FALSE);
+ }
+ break;
+ default:
+ KEBUGCHECK(0);
+ }
+ ExReleaseFastMutex(&Ccb->DataListLock);
+ KeUnlockMutex(&DeviceExt->PipeListLock);
+ if (Complete)
+ {
+ Irp->IoStatus.Status = STATUS_CANCELLED;
+ Irp->IoStatus.Information = 0;
+ IoCompleteRequest(Irp, IO_NO_INCREMENT);
+ }
+}
+
+static VOID STDCALL
+NpfsWaiterThread(PVOID InitContext)
+{
+ PNPFS_THREAD_CONTEXT ThreadContext = (PNPFS_THREAD_CONTEXT) InitContext;
+ ULONG CurrentCount;
+ ULONG Count = 0;
+ PIRP Irp = NULL;
+ PIRP NextIrp;
+ NTSTATUS Status;
+ BOOLEAN Terminate = FALSE;
+ BOOLEAN Cancel = FALSE;
+ PIO_STACK_LOCATION IoStack = NULL;
+ PNPFS_CONTEXT Context;
+ PNPFS_CONTEXT NextContext;
+ PNPFS_CCB Ccb;
+
+ KeLockMutex(&ThreadContext->DeviceExt->PipeListLock);
+
+ while (1)
+ {
+ CurrentCount = ThreadContext->Count;
+ KeUnlockMutex(&ThreadContext->DeviceExt->PipeListLock);
+ if (Irp)
+ {
+ if (Cancel)
+ {
+ Irp->IoStatus.Status = STATUS_CANCELLED;
+ Irp->IoStatus.Information = 0;
+ IoCompleteRequest(Irp, IO_NO_INCREMENT);
+ }
+ else
+ {
+ switch (IoStack->MajorFunction)
+ {
+ case IRP_MJ_READ:
+ NpfsRead(IoStack->DeviceObject, Irp);
+ break;
+ default:
+ KEBUGCHECK(0);
+ }
+ }
+ }
+ if (Terminate)
+ {
+ break;
+ }
+ Status = KeWaitForMultipleObjects(CurrentCount,
+ ThreadContext->WaitObjectArray,
+ WaitAny,
+ Executive,
+ KernelMode,
+ FALSE,
+ NULL,
+ ThreadContext->WaitBlockArray);
+ if (!NT_SUCCESS(Status))
+ {
+ KEBUGCHECK(0);
+ }
+ KeLockMutex(&ThreadContext->DeviceExt->PipeListLock);
+ Count = Status - STATUS_SUCCESS;
+ ASSERT (Count < CurrentCount);
+ if (Count > 0)
+ {
+ Irp = ThreadContext->WaitIrpArray[Count];
+ ThreadContext->Count--;
+ ThreadContext->DeviceExt->EmptyWaiterCount++;
+ ThreadContext->WaitObjectArray[Count] = ThreadContext->WaitObjectArray[ThreadContext->Count];
+ ThreadContext->WaitIrpArray[Count] = ThreadContext->WaitIrpArray[ThreadContext->Count];
+
+ Cancel = (NULL == IoSetCancelRoutine(Irp, NULL));
+ Context = (PNPFS_CONTEXT)&Irp->Tail.Overlay.DriverContext;
+ IoStack = IoGetCurrentIrpStackLocation(Irp);
+
+ if (Cancel)
+ {
+ Ccb = IoStack->FileObject->FsContext2;
+ ExAcquireFastMutex(&Ccb->DataListLock);
+ RemoveEntryList(&Context->ListEntry);
+ switch (IoStack->MajorFunction)
+ {
+ case IRP_MJ_READ:
+ if (!IsListEmpty(&Ccb->ReadRequestListHead))
+ {
+ /* put the next request on the wait list */
+ NextContext = CONTAINING_RECORD(Ccb->ReadRequestListHead.Flink, NPFS_CONTEXT, ListEntry);
+ ThreadContext->WaitObjectArray[ThreadContext->Count] = NextContext->WaitEvent;
+ NextIrp = CONTAINING_RECORD(NextContext, IRP, Tail.Overlay.DriverContext);
+ ThreadContext->WaitIrpArray[ThreadContext->Count] = NextIrp;
+ ThreadContext->Count++;
+ ThreadContext->DeviceExt->EmptyWaiterCount--;
+ }
+ break;
+ default:
+ KEBUGCHECK(0);
+ }
+ ExReleaseFastMutex(&Ccb->DataListLock);
+ }
+ }
+ else
+ {
+ /* someone has add a new wait request */
+ Irp = NULL;
+ }
+ if (ThreadContext->Count == 1 && ThreadContext->DeviceExt->EmptyWaiterCount >= MAXIMUM_WAIT_OBJECTS)
+ {
+ /* it exist an other thread with empty wait slots, we can remove our thread from the list */
+ RemoveEntryList(&ThreadContext->ListEntry);
+ ThreadContext->DeviceExt->EmptyWaiterCount -= MAXIMUM_WAIT_OBJECTS - 1;
+ Terminate = TRUE;
+ }
+ }
+ ExFreePool(ThreadContext);
+}
+
+static NTSTATUS
+NpfsAddWaitingReadWriteRequest(IN PDEVICE_OBJECT DeviceObject,
+ IN PIRP Irp)
+{
+ PLIST_ENTRY ListEntry;
+ PNPFS_THREAD_CONTEXT ThreadContext = NULL;
+ NTSTATUS Status;
+ HANDLE hThread;
+ KIRQL oldIrql;
+
+ PNPFS_CONTEXT Context = (PNPFS_CONTEXT)&Irp->Tail.Overlay.DriverContext;
+ PNPFS_DEVICE_EXTENSION DeviceExt = (PNPFS_DEVICE_EXTENSION)DeviceObject->DeviceExtension;
+
+ DPRINT("NpfsAddWaitingReadWriteRequest(DeviceObject %p, Irp %p)\n", DeviceObject, Irp);
+
+ KeLockMutex(&DeviceExt->PipeListLock);
+
+ ListEntry = DeviceExt->ThreadListHead.Flink;
+ while (ListEntry != &DeviceExt->ThreadListHead)
+ {
+ ThreadContext = CONTAINING_RECORD(ListEntry, NPFS_THREAD_CONTEXT, ListEntry);
+ if (ThreadContext->Count < MAXIMUM_WAIT_OBJECTS)
+ {
+ break;
+ }
+ ListEntry = ListEntry->Flink;
+ }
+ if (ListEntry == &DeviceExt->ThreadListHead)
+ {
+ ThreadContext = ExAllocatePool(NonPagedPool, sizeof(NPFS_THREAD_CONTEXT));
+ if (ThreadContext == NULL)
+ {
+ KeUnlockMutex(&DeviceExt->PipeListLock);
+ return STATUS_NO_MEMORY;
+ }
+ ThreadContext->DeviceExt = DeviceExt;
+ 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))
+ {
+ ExFreePool(ThreadContext);
+ KeUnlockMutex(&DeviceExt->PipeListLock);
+ return Status;
+ }
+ InsertHeadList(&DeviceExt->ThreadListHead, &ThreadContext->ListEntry);
+ DeviceExt->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++;
+ DeviceExt->EmptyWaiterCount--;
+ KeSetEvent(&ThreadContext->Event, IO_NO_INCREMENT, FALSE);
+ Status = STATUS_SUCCESS;
+ }
+ KeUnlockMutex(&DeviceExt->PipeListLock);
+ return Status;
+}
+
+NTSTATUS STDCALL
+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;
+ ULONG TempLength;
+ BOOLEAN IsOriginalRequest = TRUE;
+ PVOID Buffer;
+
+ DPRINT("NpfsRead(DeviceObject %p, Irp %p)\n", DeviceObject, Irp);
+
+ if (Irp->MdlAddress == NULL)
+ {
+ DPRINT("Irp->MdlAddress == NULL\n");
+ Status = STATUS_UNSUCCESSFUL;
+ Irp->IoStatus.Information = 0;
+ goto done;
+ }
+
+ FileObject = IoGetCurrentIrpStackLocation(Irp)->FileObject;
+ Ccb = FileObject->FsContext2;
+ Context = (PNPFS_CONTEXT)&Irp->Tail.Overlay.DriverContext;
+
+ if (Ccb->OtherSide == NULL)
+ {
+ 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;
+ Irp->IoStatus.Information = 0;
+ goto done;
+ }
+
+ if (Ccb->Data == NULL)
+ {
+ DPRINT1("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);
+ Status = KeWaitForSingleObject(&Event,
+ Executive,
+ KernelMode,
+ FALSE,
+ NULL);
+ if (!NT_SUCCESS(Status))
+ {
+ KEBUGCHECK(0);
+ }
+ 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;
+ 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 = MmGetSystemAddressForMdl(Irp->MdlAddress);
+ 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)
+ {
+ if (Ccb->PipeState == FILE_PIPE_CONNECTED_STATE)
+ {
+ ASSERT(Ccb->OtherSide != NULL);
+ KeSetEvent(&Ccb->OtherSide->WriteEvent, IO_NO_INCREMENT, FALSE);
+ }
+ if (Information > 0 &&
+ (Ccb->Fcb->ReadMode != FILE_PIPE_BYTE_STREAM_MODE ||
+ Ccb->PipeState != FILE_PIPE_CONNECTED_STATE))
+ {
+ break;
+ }
+ if (Ccb->PipeState != FILE_PIPE_CONNECTED_STATE)
+ {
+ DPRINT("PipeState: %x\n", Ccb->PipeState);
+ Status = STATUS_PIPE_BROKEN;
+ break;
+ }
+ 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,
+ KernelMode,
+ FALSE,
+ NULL);
+ DPRINT("Finished waiting (%wZ)! Status: %x\n", &Ccb->Fcb->PipeName, Status);
+ ExAcquireFastMutex(&Ccb->DataListLock);
+ }
+ else
+ {
+ Context = (PNPFS_CONTEXT)&Irp->Tail.Overlay.DriverContext;
+
+ Context->WaitEvent = &Ccb->ReadEvent;
+ Status = NpfsAddWaitingReadWriteRequest(DeviceObject, Irp);
+
+ if (NT_SUCCESS(Status))
+ {
+ Status = STATUS_PENDING;
+ }
+ ExAcquireFastMutex(&Ccb->DataListLock);
+ break;
+ }
+ }
+ ASSERT(IoGetCurrentIrpStackLocation(Irp)->FileObject != NULL);
+ if (Ccb->Fcb->ReadMode == FILE_PIPE_BYTE_STREAM_MODE)
+ {
+ DPRINT("Byte stream mode\n");
+ /* 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)
+ {
+ if (Ccb->PipeState == FILE_PIPE_CONNECTED_STATE)
+ {
+ KeSetEvent(&Ccb->OtherSide->WriteEvent, IO_NO_INCREMENT, FALSE);
+ }
+ KeResetEvent(&Ccb->ReadEvent);
+ break;
+ }
+ }
+ else
+ {
+ DPRINT("Message mode\n");
+
+ /* Message mode */
+ if (Ccb->ReadDataAvailable)
+ {
+ /* Truncate the message if the receive buffer is too small */
+ CopyLength = min(Ccb->ReadDataAvailable, Length);
+ memcpy(Buffer, Ccb->Data, CopyLength);
+
+#ifndef NDEBUG
+ DPRINT("Length %d Buffer %x\n",CopyLength,Buffer);
+ HexDump((PUCHAR)Buffer, CopyLength);
+#endif
+
+ Information = CopyLength;
+
+ if (Ccb->ReadDataAvailable > Length)
+ {
+ memmove(Ccb->Data, (PVOID)((ULONG_PTR)Ccb->Data + Length),
+ Ccb->ReadDataAvailable - Length);
+ Ccb->ReadDataAvailable -= Length;
+ Status = STATUS_MORE_ENTRIES;
+ }
+ else
+ {
+ KeResetEvent(&Ccb->ReadEvent);
+ if (Ccb->PipeState == FILE_PIPE_CONNECTED_STATE)
+ {
+ KeSetEvent(&Ccb->OtherSide->WriteEvent, IO_NO_INCREMENT, FALSE);
+ }
+ Ccb->ReadDataAvailable = 0;
+ Ccb->WriteQuotaAvailable = Ccb->MaxDataLength;
+ }
+ }
+
+ if (Information > 0)
+ {
+ break;
+ }
+ }
+ }
+ 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
+ {
+ 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;
+ }
+ Context = CONTAINING_RECORD(Ccb->ReadRequestListHead.Flink, NPFS_CONTEXT, ListEntry);
+ Irp = CONTAINING_RECORD(Context, IRP, Tail.Overlay.DriverContext);
+ }
+ }
+
+done:
+ Irp->IoStatus.Status = Status;
+
+ if (Status != STATUS_PENDING)
+ {
+ IoCompleteRequest(Irp, IO_NO_INCREMENT);
+ }
+ DPRINT("NpfsRead done (Status %lx)\n", Status);
+
+ return Status;
+}
+
+NTSTATUS STDCALL
+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;
+ ULONG CopyLength;
+ ULONG TempLength;
+
+ DPRINT("NpfsWrite()\n");
+
+ IoStack = IoGetCurrentIrpStackLocation(Irp);
+ FileObject = IoStack->FileObject;
+ DPRINT("FileObject %p\n", FileObject);
+ DPRINT("Pipe name %wZ\n", &FileObject->FileName);
+
+ Ccb = FileObject->FsContext2;
+ ReaderCcb = Ccb->OtherSide;
+ Fcb = Ccb->Fcb;
+
+ Length = IoStack->Parameters.Write.Length;
+ Offset = IoStack->Parameters.Write.ByteOffset.u.LowPart;
+ Information = 0;
+
+ if (Irp->MdlAddress == NULL)
+ {
+ DPRINT("Irp->MdlAddress == NULL\n");
+ Status = STATUS_UNSUCCESSFUL;
+ Length = 0;
+ goto done;
+ }
+
+ if (ReaderCcb == NULL)
+ {
+ 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 = MmGetSystemAddressForMdl (Irp->MdlAddress);
+
+ ExAcquireFastMutex(&ReaderCcb->DataListLock);
+#ifndef NDEBUG
+ DPRINT("Length %d Buffer %x Offset %x\n",Length,Buffer,Offset);
+ HexDump(Buffer, Length);
+#endif
+
+ while(1)
+ {
+ if (ReaderCcb->WriteQuotaAvailable == 0)
+ {
+ KeSetEvent(&ReaderCcb->ReadEvent, IO_NO_INCREMENT, FALSE);
+ if (Ccb->PipeState != FILE_PIPE_CONNECTED_STATE)
+ {
+ Status = STATUS_PIPE_BROKEN;
+ ExReleaseFastMutex(&ReaderCcb->DataListLock);
+ goto done;
+ }
+ ExReleaseFastMutex(&ReaderCcb->DataListLock);
+
+ DPRINT("Waiting for buffer space (%S)\n", Fcb->PipeName.Buffer);
+ Status = KeWaitForSingleObject(&Ccb->WriteEvent,
+ UserRequest,
+ KernelMode,
+ FALSE,
+ NULL);
+ DPRINT("Finished waiting (%S)! Status: %x\n", Fcb->PipeName.Buffer, Status);
+
+ /*
+ * It's possible that the event was signaled because the
+ * other side of pipe was closed.
+ */
+ if (Ccb->PipeState != FILE_PIPE_CONNECTED_STATE)
+ {
+ DPRINT("PipeState: %x\n", Ccb->PipeState);
+ Status = STATUS_PIPE_BROKEN;
+ // ExReleaseFastMutex(&ReaderCcb->DataListLock);
+ goto done;
+ }
+
+ ExAcquireFastMutex(&ReaderCcb->DataListLock);
+ }
+
+ if (Fcb->WriteMode == FILE_PIPE_BYTE_STREAM_MODE)
+ {
+ DPRINT("Byte stream mode\n");
+ 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);
+ KeResetEvent(&Ccb->WriteEvent);
+ break;
+ }
+ }
+ else
+ {
+ DPRINT("Message mode\n");
+ if (Length > 0)
+ {
+ CopyLength = min(Length, ReaderCcb->WriteQuotaAvailable);
+ memcpy(ReaderCcb->Data, Buffer, CopyLength);
+
+ Information = CopyLength;
+ ReaderCcb->ReadDataAvailable = CopyLength;
+ ReaderCcb->WriteQuotaAvailable = 0;
+ }
+
+ if (Information > 0)
+ {
+ KeSetEvent(&ReaderCcb->ReadEvent, IO_NO_INCREMENT, FALSE);
+ KeResetEvent(&Ccb->WriteEvent);
+ break;
+ }
+ }
+ }
+
+ 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 / commitdiff