IoAdjustPagingPathCount

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

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

Parameters

Count

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

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

Return Value

None

Headers

Declared in wdm.h and ntddk.h. Include wdm.h or ntddk.h.

Comments

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.

Callers of IoAdjustPagingPathCount can be running at any IRQL.

See Also

IRP_MN_DEVICE_USAGE_NOTIFICATION