165 lines
3.3 KiB
C
165 lines
3.3 KiB
C
/*++
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Copyright (c) 1991, 1992, 1993 Microsoft Corporation
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Module Name:
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flush.c
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Abstract:
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This module contains the code that is very specific to flush
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operations in the serial driver
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Author:
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Anthony V. Ercolano 26-Sep-1991
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Environment:
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Kernel mode
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Revision History :
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--*/
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#include "precomp.h"
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NTSTATUS
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SerialStartFlush(
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IN PSERIAL_DEVICE_EXTENSION Extension
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);
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text(PAGESRP0,SerialFlush)
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#pragma alloc_text(PAGESRP0,SerialStartFlush)
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#endif
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NTSTATUS
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SerialFlush(
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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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Routine Description:
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This is the dispatch routine for flush. Flushing works by placing
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this request in the write queue. When this request reaches the
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front of the write queue we simply complete it since this implies
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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:
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Could return status success, cancelled, or pending.
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--*/
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{
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PSERIAL_DEVICE_EXTENSION Extension = DeviceObject->DeviceExtension;
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NTSTATUS status;
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PAGED_CODE();
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SerialDump(
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SERIRPPATH,
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("SERIAL: Dispatch entry for: %x\n",Irp)
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);
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SerialDump(SERTRACECALLS, ("SERIAL: Entering SerialFlush\n"));
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Irp->IoStatus.Information = 0L;
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if ((status = SerialIRPPrologue(Irp, Extension)) == STATUS_SUCCESS) {
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if (SerialCompleteIfError(DeviceObject, Irp) != STATUS_SUCCESS) {
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SerialDump(SERTRACECALLS, ("SERIAL: Leaving SerialFlush (1)\n"));
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return STATUS_CANCELLED;
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}
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SerialDump(SERTRACECALLS, ("SERIAL: Leaving SerialFlush (2)\n"));
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return SerialStartOrQueue(Extension, Irp, &Extension->WriteQueue,
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&Extension->CurrentWriteIrp, SerialStartFlush);
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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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SerialCompleteRequest(Extension, Irp, IO_NO_INCREMENT);
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}
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SerialDump(SERTRACECALLS, ("SERIAL: Leaving SerialFlush (3)\n"));
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return status;
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}
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}
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NTSTATUS
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SerialStartFlush(
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IN PSERIAL_DEVICE_EXTENSION Extension
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)
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/*++
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Routine Description:
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This routine is called if there were no writes in the queue.
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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
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nothing in the queue now! So, we will start off the write
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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:
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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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//
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// The following call will actually complete the flush.
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//
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SerialGetNextWrite(
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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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SerialStartWrite(Extension);
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}
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return STATUS_SUCCESS;
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}
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