mirror of
https://github.com/reactos/reactos.git
synced 2025-06-19 18:55:25 +00:00
780 lines
20 KiB
C
780 lines
20 KiB
C
/*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS kernel
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* FILE: drivers/fs/np/rw.c
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* PURPOSE: Named pipe filesystem
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* PROGRAMMER: David Welch <welch@cwcom.net>
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*/
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/* INCLUDES ******************************************************************/
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#include "npfs.h"
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#define NDEBUG
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#include <debug.h>
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/* FUNCTIONS *****************************************************************/
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#ifndef NDEBUG
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VOID HexDump(PUCHAR Buffer, ULONG Length)
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{
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CHAR Line[65];
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UCHAR ch;
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const char Hex[] = "0123456789ABCDEF";
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int i, j;
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DbgPrint("---------------\n");
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for (i = 0; i < Length; i+= 16)
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{
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memset(Line, ' ', 64);
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Line[64] = 0;
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for (j = 0; j < 16 && j + i < Length; j++)
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{
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ch = Buffer[i + j];
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Line[3*j + 0] = Hex[ch >> 4];
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Line[3*j + 1] = Hex[ch & 0x0f];
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Line[48 + j] = isprint(ch) ? ch : '.';
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}
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DbgPrint("%s\n", Line);
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}
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DbgPrint("---------------\n");
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}
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#endif
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static DRIVER_CANCEL NpfsReadWriteCancelRoutine;
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static VOID STDCALL
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NpfsReadWriteCancelRoutine(IN PDEVICE_OBJECT DeviceObject,
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IN PIRP Irp)
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{
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PNPFS_CONTEXT Context;
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PNPFS_DEVICE_EXTENSION DeviceExt;
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PIO_STACK_LOCATION IoStack;
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PNPFS_CCB Ccb;
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BOOLEAN Complete = FALSE;
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DPRINT("NpfsReadWriteCancelRoutine(DeviceObject %p, Irp %p)\n", DeviceObject, Irp);
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IoReleaseCancelSpinLock(Irp->CancelIrql);
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Context = (PNPFS_CONTEXT)&Irp->Tail.Overlay.DriverContext;
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DeviceExt = (PNPFS_DEVICE_EXTENSION)DeviceObject->DeviceExtension;
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IoStack = IoGetCurrentIrpStackLocation(Irp);
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Ccb = IoStack->FileObject->FsContext2;
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KeLockMutex(&DeviceExt->PipeListLock);
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ExAcquireFastMutex(&Ccb->DataListLock);
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switch(IoStack->MajorFunction)
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{
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case IRP_MJ_READ:
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if (Ccb->ReadRequestListHead.Flink != &Context->ListEntry)
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{
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/* we are not the first in the list, remove an complete us */
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RemoveEntryList(&Context->ListEntry);
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Complete = TRUE;
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}
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else
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{
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KeSetEvent(&Ccb->ReadEvent, IO_NO_INCREMENT, FALSE);
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}
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break;
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default:
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KEBUGCHECK(0);
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}
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ExReleaseFastMutex(&Ccb->DataListLock);
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KeUnlockMutex(&DeviceExt->PipeListLock);
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if (Complete)
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{
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Irp->IoStatus.Status = STATUS_CANCELLED;
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Irp->IoStatus.Information = 0;
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IoCompleteRequest(Irp, IO_NO_INCREMENT);
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}
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}
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static VOID STDCALL
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NpfsWaiterThread(PVOID InitContext)
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{
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PNPFS_THREAD_CONTEXT ThreadContext = (PNPFS_THREAD_CONTEXT) InitContext;
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ULONG CurrentCount;
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ULONG Count = 0;
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PIRP Irp = NULL;
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PIRP NextIrp;
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NTSTATUS Status;
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BOOLEAN Terminate = FALSE;
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BOOLEAN Cancel = FALSE;
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PIO_STACK_LOCATION IoStack = NULL;
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PNPFS_CONTEXT Context;
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PNPFS_CONTEXT NextContext;
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PNPFS_CCB Ccb;
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KeLockMutex(&ThreadContext->DeviceExt->PipeListLock);
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while (1)
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{
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CurrentCount = ThreadContext->Count;
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KeUnlockMutex(&ThreadContext->DeviceExt->PipeListLock);
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if (Irp)
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{
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if (Cancel)
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{
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Irp->IoStatus.Status = STATUS_CANCELLED;
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Irp->IoStatus.Information = 0;
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IoCompleteRequest(Irp, IO_NO_INCREMENT);
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}
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else
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{
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switch (IoStack->MajorFunction)
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{
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case IRP_MJ_READ:
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NpfsRead(IoStack->DeviceObject, Irp);
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break;
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default:
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KEBUGCHECK(0);
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}
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}
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}
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if (Terminate)
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{
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break;
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}
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Status = KeWaitForMultipleObjects(CurrentCount,
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ThreadContext->WaitObjectArray,
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WaitAny,
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Executive,
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KernelMode,
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FALSE,
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NULL,
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ThreadContext->WaitBlockArray);
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if (!NT_SUCCESS(Status))
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{
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KEBUGCHECK(0);
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}
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KeLockMutex(&ThreadContext->DeviceExt->PipeListLock);
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Count = Status - STATUS_SUCCESS;
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ASSERT (Count < CurrentCount);
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if (Count > 0)
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{
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Irp = ThreadContext->WaitIrpArray[Count];
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ThreadContext->Count--;
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ThreadContext->DeviceExt->EmptyWaiterCount++;
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ThreadContext->WaitObjectArray[Count] = ThreadContext->WaitObjectArray[ThreadContext->Count];
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ThreadContext->WaitIrpArray[Count] = ThreadContext->WaitIrpArray[ThreadContext->Count];
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Cancel = (NULL == IoSetCancelRoutine(Irp, NULL));
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Context = (PNPFS_CONTEXT)&Irp->Tail.Overlay.DriverContext;
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IoStack = IoGetCurrentIrpStackLocation(Irp);
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if (Cancel)
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{
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Ccb = IoStack->FileObject->FsContext2;
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ExAcquireFastMutex(&Ccb->DataListLock);
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RemoveEntryList(&Context->ListEntry);
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switch (IoStack->MajorFunction)
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{
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case IRP_MJ_READ:
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if (!IsListEmpty(&Ccb->ReadRequestListHead))
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{
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/* put the next request on the wait list */
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NextContext = CONTAINING_RECORD(Ccb->ReadRequestListHead.Flink, NPFS_CONTEXT, ListEntry);
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ThreadContext->WaitObjectArray[ThreadContext->Count] = NextContext->WaitEvent;
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NextIrp = CONTAINING_RECORD(NextContext, IRP, Tail.Overlay.DriverContext);
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ThreadContext->WaitIrpArray[ThreadContext->Count] = NextIrp;
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ThreadContext->Count++;
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ThreadContext->DeviceExt->EmptyWaiterCount--;
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}
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break;
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default:
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KEBUGCHECK(0);
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}
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ExReleaseFastMutex(&Ccb->DataListLock);
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}
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}
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else
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{
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/* someone has add a new wait request */
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Irp = NULL;
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}
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if (ThreadContext->Count == 1 && ThreadContext->DeviceExt->EmptyWaiterCount >= MAXIMUM_WAIT_OBJECTS)
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{
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/* it exist an other thread with empty wait slots, we can remove our thread from the list */
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RemoveEntryList(&ThreadContext->ListEntry);
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ThreadContext->DeviceExt->EmptyWaiterCount -= MAXIMUM_WAIT_OBJECTS - 1;
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Terminate = TRUE;
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}
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}
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ExFreePool(ThreadContext);
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}
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static NTSTATUS
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NpfsAddWaitingReadWriteRequest(IN PDEVICE_OBJECT DeviceObject,
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IN PIRP Irp)
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{
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PLIST_ENTRY ListEntry;
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PNPFS_THREAD_CONTEXT ThreadContext = NULL;
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NTSTATUS Status;
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HANDLE hThread;
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KIRQL oldIrql;
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PNPFS_CONTEXT Context = (PNPFS_CONTEXT)&Irp->Tail.Overlay.DriverContext;
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PNPFS_DEVICE_EXTENSION DeviceExt = (PNPFS_DEVICE_EXTENSION)DeviceObject->DeviceExtension;
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DPRINT("NpfsAddWaitingReadWriteRequest(DeviceObject %p, Irp %p)\n", DeviceObject, Irp);
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KeLockMutex(&DeviceExt->PipeListLock);
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ListEntry = DeviceExt->ThreadListHead.Flink;
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while (ListEntry != &DeviceExt->ThreadListHead)
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{
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ThreadContext = CONTAINING_RECORD(ListEntry, NPFS_THREAD_CONTEXT, ListEntry);
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if (ThreadContext->Count < MAXIMUM_WAIT_OBJECTS)
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{
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break;
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}
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ListEntry = ListEntry->Flink;
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}
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if (ListEntry == &DeviceExt->ThreadListHead)
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{
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ThreadContext = ExAllocatePool(NonPagedPool, sizeof(NPFS_THREAD_CONTEXT));
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if (ThreadContext == NULL)
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{
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KeUnlockMutex(&DeviceExt->PipeListLock);
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return STATUS_NO_MEMORY;
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}
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ThreadContext->DeviceExt = DeviceExt;
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KeInitializeEvent(&ThreadContext->Event, SynchronizationEvent, FALSE);
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ThreadContext->Count = 1;
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ThreadContext->WaitObjectArray[0] = &ThreadContext->Event;
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DPRINT("Creating a new system thread for waiting read/write requests\n");
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Status = PsCreateSystemThread(&hThread,
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THREAD_ALL_ACCESS,
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NULL,
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NULL,
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NULL,
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NpfsWaiterThread,
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(PVOID)ThreadContext);
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if (!NT_SUCCESS(Status))
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{
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ExFreePool(ThreadContext);
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KeUnlockMutex(&DeviceExt->PipeListLock);
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return Status;
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}
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InsertHeadList(&DeviceExt->ThreadListHead, &ThreadContext->ListEntry);
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DeviceExt->EmptyWaiterCount += MAXIMUM_WAIT_OBJECTS - 1;
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}
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IoMarkIrpPending(Irp);
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IoAcquireCancelSpinLock(&oldIrql);
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if (Irp->Cancel)
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{
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IoReleaseCancelSpinLock(oldIrql);
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Status = STATUS_CANCELLED;
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}
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else
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{
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(void)IoSetCancelRoutine(Irp, NpfsReadWriteCancelRoutine);
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IoReleaseCancelSpinLock(oldIrql);
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ThreadContext->WaitObjectArray[ThreadContext->Count] = Context->WaitEvent;
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ThreadContext->WaitIrpArray[ThreadContext->Count] = Irp;
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ThreadContext->Count++;
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DeviceExt->EmptyWaiterCount--;
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KeSetEvent(&ThreadContext->Event, IO_NO_INCREMENT, FALSE);
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Status = STATUS_SUCCESS;
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}
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KeUnlockMutex(&DeviceExt->PipeListLock);
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return Status;
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}
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NTSTATUS STDCALL
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NpfsRead(IN PDEVICE_OBJECT DeviceObject,
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IN PIRP Irp)
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{
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PFILE_OBJECT FileObject;
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NTSTATUS Status;
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NTSTATUS OriginalStatus = STATUS_SUCCESS;
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PNPFS_CCB Ccb;
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PNPFS_CONTEXT Context;
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KEVENT Event;
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ULONG Length;
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ULONG Information = 0;
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ULONG CopyLength;
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ULONG TempLength;
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BOOLEAN IsOriginalRequest = TRUE;
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PVOID Buffer;
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DPRINT("NpfsRead(DeviceObject %p, Irp %p)\n", DeviceObject, Irp);
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if (Irp->MdlAddress == NULL)
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{
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DPRINT("Irp->MdlAddress == NULL\n");
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Status = STATUS_UNSUCCESSFUL;
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Irp->IoStatus.Information = 0;
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goto done;
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}
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FileObject = IoGetCurrentIrpStackLocation(Irp)->FileObject;
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Ccb = FileObject->FsContext2;
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Context = (PNPFS_CONTEXT)&Irp->Tail.Overlay.DriverContext;
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if (Ccb->OtherSide == NULL)
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{
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DPRINT("Pipe is NOT connected!\n");
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if (Ccb->PipeState == FILE_PIPE_LISTENING_STATE)
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Status = STATUS_PIPE_LISTENING;
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else if (Ccb->PipeState == FILE_PIPE_DISCONNECTED_STATE)
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Status = STATUS_PIPE_DISCONNECTED;
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else
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Status = STATUS_UNSUCCESSFUL;
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Irp->IoStatus.Information = 0;
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goto done;
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}
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if (Ccb->Data == NULL)
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{
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DPRINT1("Pipe is NOT readable!\n");
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Status = STATUS_UNSUCCESSFUL;
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Irp->IoStatus.Information = 0;
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goto done;
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}
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ExAcquireFastMutex(&Ccb->DataListLock);
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if (IoIsOperationSynchronous(Irp))
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{
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InsertTailList(&Ccb->ReadRequestListHead, &Context->ListEntry);
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if (Ccb->ReadRequestListHead.Flink != &Context->ListEntry)
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{
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KeInitializeEvent(&Event, SynchronizationEvent, FALSE);
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Context->WaitEvent = &Event;
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ExReleaseFastMutex(&Ccb->DataListLock);
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Status = KeWaitForSingleObject(&Event,
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Executive,
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KernelMode,
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FALSE,
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NULL);
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if (!NT_SUCCESS(Status))
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{
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KEBUGCHECK(0);
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}
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ExAcquireFastMutex(&Ccb->DataListLock);
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}
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Irp->IoStatus.Information = 0;
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}
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else
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{
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KIRQL oldIrql;
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if (IsListEmpty(&Ccb->ReadRequestListHead) ||
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Ccb->ReadRequestListHead.Flink != &Context->ListEntry)
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{
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/* this is a new request */
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Irp->IoStatus.Information = 0;
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Context->WaitEvent = &Ccb->ReadEvent;
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InsertTailList(&Ccb->ReadRequestListHead, &Context->ListEntry);
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if (Ccb->ReadRequestListHead.Flink != &Context->ListEntry)
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{
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/* there was already a request on the list */
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IoAcquireCancelSpinLock(&oldIrql);
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if (Irp->Cancel)
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{
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IoReleaseCancelSpinLock(oldIrql);
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RemoveEntryList(&Context->ListEntry);
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ExReleaseFastMutex(&Ccb->DataListLock);
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Status = STATUS_CANCELLED;
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goto done;
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}
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(void)IoSetCancelRoutine(Irp, NpfsReadWriteCancelRoutine);
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IoReleaseCancelSpinLock(oldIrql);
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ExReleaseFastMutex(&Ccb->DataListLock);
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IoMarkIrpPending(Irp);
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Status = STATUS_PENDING;
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goto done;
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}
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}
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}
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while (1)
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{
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Buffer = MmGetSystemAddressForMdl(Irp->MdlAddress);
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Information = Irp->IoStatus.Information;
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Length = IoGetCurrentIrpStackLocation(Irp)->Parameters.Read.Length;
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ASSERT (Information <= Length);
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Buffer = (PVOID)((ULONG_PTR)Buffer + Information);
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Length -= Information;
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Status = STATUS_SUCCESS;
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while (1)
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{
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if (Ccb->ReadDataAvailable == 0)
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{
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if (Ccb->PipeState == FILE_PIPE_CONNECTED_STATE)
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{
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ASSERT(Ccb->OtherSide != NULL);
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KeSetEvent(&Ccb->OtherSide->WriteEvent, IO_NO_INCREMENT, FALSE);
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}
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if (Information > 0 &&
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(Ccb->Fcb->ReadMode != FILE_PIPE_BYTE_STREAM_MODE ||
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Ccb->PipeState != FILE_PIPE_CONNECTED_STATE))
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{
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break;
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}
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if (Ccb->PipeState != FILE_PIPE_CONNECTED_STATE)
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{
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DPRINT("PipeState: %x\n", Ccb->PipeState);
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Status = STATUS_PIPE_BROKEN;
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break;
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}
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ExReleaseFastMutex(&Ccb->DataListLock);
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if (IoIsOperationSynchronous(Irp))
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{
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/* Wait for ReadEvent to become signaled */
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DPRINT("Waiting for readable data (%wZ)\n", &Ccb->Fcb->PipeName);
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Status = KeWaitForSingleObject(&Ccb->ReadEvent,
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UserRequest,
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KernelMode,
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FALSE,
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NULL);
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DPRINT("Finished waiting (%wZ)! Status: %x\n", &Ccb->Fcb->PipeName, Status);
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ExAcquireFastMutex(&Ccb->DataListLock);
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}
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else
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{
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Context = (PNPFS_CONTEXT)&Irp->Tail.Overlay.DriverContext;
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Context->WaitEvent = &Ccb->ReadEvent;
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Status = NpfsAddWaitingReadWriteRequest(DeviceObject, Irp);
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if (NT_SUCCESS(Status))
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{
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Status = STATUS_PENDING;
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}
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ExAcquireFastMutex(&Ccb->DataListLock);
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break;
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}
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}
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ASSERT(IoGetCurrentIrpStackLocation(Irp)->FileObject != NULL);
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if (Ccb->Fcb->ReadMode == FILE_PIPE_BYTE_STREAM_MODE)
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{
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DPRINT("Byte stream mode\n");
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/* Byte stream mode */
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while (Length > 0 && Ccb->ReadDataAvailable > 0)
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{
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CopyLength = min(Ccb->ReadDataAvailable, Length);
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if ((ULONG_PTR)Ccb->ReadPtr + CopyLength <= (ULONG_PTR)Ccb->Data + Ccb->MaxDataLength)
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{
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memcpy(Buffer, Ccb->ReadPtr, CopyLength);
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Ccb->ReadPtr = (PVOID)((ULONG_PTR)Ccb->ReadPtr + CopyLength);
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if (Ccb->ReadPtr == (PVOID)((ULONG_PTR)Ccb->Data + Ccb->MaxDataLength))
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{
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Ccb->ReadPtr = Ccb->Data;
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}
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}
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else
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{
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TempLength = (ULONG)((ULONG_PTR)Ccb->Data + Ccb->MaxDataLength - (ULONG_PTR)Ccb->ReadPtr);
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memcpy(Buffer, Ccb->ReadPtr, TempLength);
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memcpy((PVOID)((ULONG_PTR)Buffer + TempLength), Ccb->Data, CopyLength - TempLength);
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Ccb->ReadPtr = (PVOID)((ULONG_PTR)Ccb->Data + CopyLength - TempLength);
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}
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Buffer = (PVOID)((ULONG_PTR)Buffer + CopyLength);
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Length -= CopyLength;
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Information += CopyLength;
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Ccb->ReadDataAvailable -= CopyLength;
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Ccb->WriteQuotaAvailable += CopyLength;
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}
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if (Length == 0)
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{
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if (Ccb->PipeState == FILE_PIPE_CONNECTED_STATE)
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{
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KeSetEvent(&Ccb->OtherSide->WriteEvent, IO_NO_INCREMENT, FALSE);
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}
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KeResetEvent(&Ccb->ReadEvent);
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break;
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}
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}
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else
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{
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DPRINT("Message mode\n");
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/* Message mode */
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if (Ccb->ReadDataAvailable)
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{
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/* Truncate the message if the receive buffer is too small */
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CopyLength = min(Ccb->ReadDataAvailable, Length);
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memcpy(Buffer, Ccb->Data, CopyLength);
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#ifndef NDEBUG
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DPRINT("Length %d Buffer %x\n",CopyLength,Buffer);
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HexDump((PUCHAR)Buffer, CopyLength);
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#endif
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Information = CopyLength;
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if (Ccb->ReadDataAvailable > Length)
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{
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memmove(Ccb->Data, (PVOID)((ULONG_PTR)Ccb->Data + Length),
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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 */
|