157 lines
2.9 KiB
C
157 lines
2.9 KiB
C
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/*++
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Copyright (c) 1989-2000 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 implements device flush functionality for UDF.
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// @@BEGIN_DDKSPLIT
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Author:
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Tom Jolly [08-15-2000]
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Revision History:
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// @@END_DDKSPLIT
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--*/
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#include "UdfProcs.h"
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//
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// The Bug check file id for this module
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//
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#define BugCheckFileId (UDFS_BUG_CHECK_FLUSH)
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//
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// The local debug trace level
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//
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#define Dbg (UDFS_DEBUG_LEVEL_FLUSH)
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text(PAGE, UdfHijackIrpAndFlushDevice)
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#endif
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//
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// Local support routine
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//
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NTSTATUS
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UdfHijackCompletionRoutine (
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IN PDEVICE_OBJECT DeviceObject,
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IN PIRP Irp,
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IN PVOID Contxt
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)
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{
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//
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// Set the event so that our call will wake up.
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//
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KeSetEvent( (PKEVENT)Contxt, 0, FALSE );
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UNREFERENCED_PARAMETER( DeviceObject );
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UNREFERENCED_PARAMETER( Irp );
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return STATUS_MORE_PROCESSING_REQUIRED;
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}
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NTSTATUS
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UdfHijackIrpAndFlushDevice (
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IN PIRP_CONTEXT IrpContext,
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IN PIRP Irp,
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IN PDEVICE_OBJECT TargetDeviceObject
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)
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/*++
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Routine Description:
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This routine is called when we need to send a flush to a device but
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we don't have a flush Irp. What this routine does is make a copy
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of its current Irp stack location, but changes the Irp Major code
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to a IRP_MJ_FLUSH_BUFFERS amd then send it down, but cut it off at
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the knees in the completion routine, fix it up and return to the
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user as if nothing had happened.
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Arguments:
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Irp - The Irp to hijack
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TargetDeviceObject - The device to send the request to.
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Return Value:
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NTSTATUS - The Status from the flush in case anybody cares.
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--*/
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{
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KEVENT Event;
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NTSTATUS Status;
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PIO_STACK_LOCATION NextIrpSp;
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PAGED_CODE();
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//
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// Get the next stack location, and copy over the stack location
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//
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NextIrpSp = IoGetNextIrpStackLocation( Irp );
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*NextIrpSp = *IoGetCurrentIrpStackLocation( Irp );
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NextIrpSp->MajorFunction = IRP_MJ_FLUSH_BUFFERS;
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NextIrpSp->MinorFunction = 0;
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//
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// Set up the completion routine
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//
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KeInitializeEvent( &Event, NotificationEvent, FALSE );
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IoSetCompletionRoutine( Irp,
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UdfHijackCompletionRoutine,
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&Event,
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TRUE,
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TRUE,
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TRUE );
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//
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// Send the request.
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//
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Status = IoCallDriver( TargetDeviceObject, Irp );
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if (Status == STATUS_PENDING) {
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KeWaitForSingleObject( &Event, Executive, KernelMode, FALSE, NULL );
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Status = Irp->IoStatus.Status;
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}
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//
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// If the driver doesn't support flushes, return SUCCESS.
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//
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if (Status == STATUS_INVALID_DEVICE_REQUEST) {
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Status = STATUS_SUCCESS;
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}
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Irp->IoStatus.Status = 0;
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Irp->IoStatus.Information = 0;
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return Status;
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}
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