IOCTL_DISK_PERFORMANCE IOCTL

Increments a reference counter that enables the collection of disk performance statistics, such as the numbers of bytes read and written since the driver last processed this request, for a corresponding disk monitoring application. In Microsoft Windows 2000 this IOCTL is handled by the filter driver diskperf. In Windows XP and later operating systems, the partition manager handles this request for disks and ftdisk.sys and dmio.sys handle this request for volumes.

Major Code

IRP_MJ_DEVICE_CONTROL

Input Buffer

None.

Input Buffer Length

None.

Output Buffer

The driver returns the DISK_PERFORMANCE data in the buffer at Irp->AssociatedIrp.SystemBuffer.

Output Buffer Length

Parameters.DeviceIoControl.OutputBufferLength in the I/O stack location of the IRP indicates the size, in bytes, of the buffer, which must be at least sizeof(DISK_PERFORMANCE).

Status Block

The Information field is set to sizeof(DISK_PERFORMANCE) when the Status field is set to STATUS_SUCCESS. Otherwise, the Status field can be set to STATUS_INVALID_PARAMETER or STATUS_BUFFER_TOO_SMALL.

Requirements

   
Header ntdddisk.h (include Ntdddisk.h)
IRQL PASSIVE_LEVEL

See Also

IOCTL_DISK_PERFORMANCE_OFF