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150 lines
4.2 KiB
150 lines
4.2 KiB
/*--------------------------------------------------------------------------
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*
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* Copyright (C) Cyclades Corporation, 1996-2001.
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* All rights reserved.
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*
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* Cyclom-Y Port Driver
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*
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* This file: cyyflush.c
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*
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* Description: This module contains the code related to flush
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* operations in the Cyclom-Y Port driver.
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*
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* Notes: This code supports Windows 2000 and Windows XP,
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* x86 and IA64 processors.
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*
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* Complies with Cyclades SW Coding Standard rev 1.3.
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*
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*--------------------------------------------------------------------------
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*/
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/*-------------------------------------------------------------------------
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*
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* Change History
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*
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*--------------------------------------------------------------------------
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*
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*
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*--------------------------------------------------------------------------
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*/
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#include "precomp.h"
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NTSTATUS
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CyyStartFlush(
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IN PCYY_DEVICE_EXTENSION Extension
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);
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text(PAGESRP0,CyyFlush)
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#pragma alloc_text(PAGESRP0,CyyStartFlush)
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#endif
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NTSTATUS
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CyyFlush(
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IN PDEVICE_OBJECT DeviceObject,
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IN PIRP Irp
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)
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/*--------------------------------------------------------------------------
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CyyFlush()
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Routine Description: This is the dispatch routine for flush. Flushing
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works by placing this request in the write queue. When this request
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reaches the front of the write queue we simply complete it since this
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implies that all previous writes have completed.
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Arguments:
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DeviceObject - Pointer to the device object for this device
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Irp - Pointer to the IRP for the current request
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Return Value: Could return status success, cancelled, or pending.
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--------------------------------------------------------------------------*/
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{
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PCYY_DEVICE_EXTENSION Extension = DeviceObject->DeviceExtension;
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NTSTATUS status;
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PAGED_CODE();
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CyyDbgPrintEx(CYYIRPPATH, "Dispatch entry for: %x\n", Irp);
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CyyDbgPrintEx(DPFLTR_TRACE_LEVEL, ">CyyFlush(%X, %X)\n",
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DeviceObject, Irp);
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Irp->IoStatus.Information = 0L;
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if ((status = CyyIRPPrologue(Irp, Extension)) == STATUS_SUCCESS) {
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if (CyyCompleteIfError(DeviceObject,Irp) != STATUS_SUCCESS) {
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CyyDbgPrintEx(DPFLTR_TRACE_LEVEL, "<CyyFlush (1) %X\n",
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STATUS_CANCELLED);
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return STATUS_CANCELLED;
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}
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status = CyyStartOrQueue(Extension, Irp, &Extension->WriteQueue,
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&Extension->CurrentWriteIrp,
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CyyStartFlush);
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CyyDbgPrintEx(DPFLTR_TRACE_LEVEL, "<CyyFlush (2) %X\n", status);
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return status;
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} else {
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Irp->IoStatus.Status = status;
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if (!NT_SUCCESS(status)) {
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CyyCompleteRequest(Extension, Irp, IO_NO_INCREMENT);
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}
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CyyDbgPrintEx(DPFLTR_TRACE_LEVEL, "<CyyFlush (3) %X\n", status);
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return status;
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}
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}
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NTSTATUS
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CyyStartFlush(
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IN PCYY_DEVICE_EXTENSION Extension
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)
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/*--------------------------------------------------------------------------
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CyyStartFlush()
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Routine Description: This routine is called if there were no writes in
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the queue. The flush became the current write because there was nothing
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in the queue. Note however that does not mean there is nothing in the
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queue now! So, we will start off the write that might follow us.
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Arguments:
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Extension - Points to the serial device extension
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Return Value: This will always return STATUS_SUCCESS.
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--------------------------------------------------------------------------*/
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{
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PIRP NewIrp;
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PAGED_CODE();
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Extension->CurrentWriteIrp->IoStatus.Status = STATUS_SUCCESS;
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// The following call will actually complete the flush.
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CyyGetNextWrite(
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&Extension->CurrentWriteIrp,
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&Extension->WriteQueue,
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&NewIrp,
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TRUE,
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Extension
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);
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if (NewIrp) {
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ASSERT(NewIrp == Extension->CurrentWriteIrp);
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CyyStartWrite(Extension);
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}
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return STATUS_SUCCESS;
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}
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