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IoAdjustPagingPathCount routine

The IoAdjustPagingPathCount routine increments or decrements a caller-supplied page-file counter as an atomic operation.

Syntax


VOID IoAdjustPagingPathCount(
  _In_  PLONG Count,
  _In_  BOOLEAN Increment
);

Parameters

Count [in]

Pointer to a caller-supplied variable that contains a counter. A driver typically stores a page-file counter in the device extension for the device.

Increment [in]

Specifies whether the counter is to be incremented or decremented. A value of TRUE specifies an increment operation.

Return value

None

Remarks

This routine is useful for maintaining a count of paging files on a device. The operating system notifies a driver that a paging file has been created on, or removed from, one of the driver's devices by sending an IRP. The IRP has the major code IRP_MJ_PNP and the minor code IRP_MN_DEVICE_USAGE_NOTIFICATION.

This routine can be used for other counters, such as counters for hibernation files or crash-dump files.

Requirements

Version

Available starting with Windows 2000.

Header

Wdm.h (include Wdm.h, Ntddk.h, or Ntifs.h)

IRQL

Any level

See also

IRP_MJ_PNP
IRP_MN_DEVICE_USAGE_NOTIFICATION

 

 

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