IOCTL_DISK_GET_LENGTH_INFO IOCTL (ntdddisk.h)

Returns the length, in bytes, of the disk, partition, or volume associated with the device object that is the target of the request.

Major code

IRP_MJ_DEVICE_CONTROL

Input buffer

None.

Input buffer length

None.

Output buffer

The driver returns the GET_LENGTH_INFORMATION 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 >= sizeof(GET_LENGTH_INFORMATION).

Status block

The Information field is set to the size, in bytes, of the returned data. The Status field can be set to STATUS_SUCCESS, or to STATUS_BUFFER_TOO_SMALL if the buffer supplied by the caller is inadequate.

Requirements

See also

GET_LENGTH_INFORMATION