#ifndef _NTIOAPI_H
typedef struct DECLSPEC_ALIGN(8) _FILE_IO_PRIORITY_HINT_INFORMATION
{
    IO_PRIORITY_HINT PriorityHint;
} FILE_IO_PRIORITY_HINT_INFORMATION, *PFILE_IO_PRIORITY_HINT_INFORMATION;
View code on GitHubThis structure is documented in Windows Driver Kit.