101 lines
2 KiB
C
101 lines
2 KiB
C
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/*++
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Copyright (c) 1997-2000 Microsoft Corporation
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Module Name:
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common.c
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Abstract:
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This module provides the functions which are common to both the PDO and FDO.
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Author:
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Andy Thornton (andrewth) 20-Oct-97
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Revision History:
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--*/
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#include "mfp.h"
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/*++
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The majority of functions in this file are called based on their presence
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in Pnp and Po dispatch tables. In the interests of brevity the arguments
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to all those functions will be described below:
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NTSTATUS
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MfXxxCommon(
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IN PIRP Irp,
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IN PMF_COMMON_EXTENSION Common,
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IN PIO_STACK_LOCATION IrpStack
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)
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Routine Description:
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This function handles the Xxx requests for all multifunction devices
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Arguments:
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Irp - Points to the IRP associated with this request.
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Parent - Points to the common device extension.
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IrpStack - Points to the current stack location for this request.
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Return Value:
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Status code that indicates whether or not the function was successful.
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STATUS_NOT_SUPPORTED indicates that the IRP should be passed down without
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changing the Irp->IoStatus.Status field otherwise it is updated with this
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status.
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--*/
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NTSTATUS
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MfDeviceUsageNotificationCommon(
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IN PIRP Irp,
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IN PMF_COMMON_EXTENSION Common,
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IN PIO_STACK_LOCATION IrpStack
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)
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{
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PULONG counter;
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//
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// Select the appropriate counter
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//
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switch (IrpStack->Parameters.UsageNotification.Type) {
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case DeviceUsageTypePaging:
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counter = &Common->PagingCount;
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break;
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case DeviceUsageTypeHibernation:
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counter = &Common->HibernationCount;
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break;
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case DeviceUsageTypeDumpFile:
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counter = &Common->DumpCount;
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break;
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default:
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return STATUS_NOT_SUPPORTED;
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}
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//
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// Update it...
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//
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IoAdjustPagingPathCount(counter,
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IrpStack->Parameters.UsageNotification.InPath
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);
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return STATUS_SUCCESS;
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}
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