IOCTL_DISK_PERFORMANCE IOCTL (ntdddisk.h)
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
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
| Requirement | Value |
|---|---|
| Header | ntdddisk.h (include Ntdddisk.h) |
| IRQL | PASSIVE_LEVEL |