#ifndef _NTPFAPI_H

/**
 * The PF_PREFETCH_REQUEST structure supplies a variable-length file and private-page prefetch request.
 */
typedef struct _PF_PREFETCH_REQUEST
{
    ULONG Version;                              // PF_PREFETCH_REQUEST_VERSION
    ULONG Size;                                 // Entire buffer size, including the 0x80-byte header (x64).
    ULONG VolumeCount;                          // Number of PF_PREFETCH_VOLUME_INFO records.
    ULONG PrefetchFileCount;                    // Total number of PF_PREFETCH_FILE_INFO records.
    ULONG RangeCount;                           // Number of PF_PREFETCH_RANGE records, not paths.
    ULONG SourceCount;                          // Number of PF_PREFETCH_SOURCE_INFO records.
    ULONG UnicodeTextSize;                      // Bytes.
    USHORT PrefetchPriority;                    // 0..7.
    USHORT VolumePrefetchPriority;              // 0..7.
    ULONG VolumeInfoOffset;                     // Byte offset to the volume records; zero when VolumeCount is zero.
    ULONG Reserved0;                            // Reserved field; initialize to zero and do not interpret on output.
    ULONG PrefetchFileInfoOffset;               // Byte offset to the file records; zero when PrefetchFileCount is zero.
    ULONG Reserved1;                            // Reserved field; initialize to zero and do not interpret on output.
    ULONG RangeInfoOffset;                      // Byte offset to PF_PREFETCH_RANGE records; zero when RangeCount is zero.
    ULONG Reserved2;                            // Reserved field; initialize to zero and do not interpret on output.
    ULONG SourceInfoOffset;                     // Byte offset to private-source records; zero when SourceCount is zero.
    ULONG Reserved3;                            // Reserved field; initialize to zero and do not interpret on output.
    ULONG UnicodeTextOffset;                    // Byte offset to the UTF-16 text area; zero when UnicodeTextSize is zero.
    ULONG Reserved4;                            // Reserved field; initialize to zero and do not interpret on output.
    HANDLE CompletionEvent;                     // Optional event handle; captured as an object in the kernel's private copy.
    union
    {
        ULONG Flags;                            // Packed request flags and scenario selector.
        struct
        {
            ULONG ContinueIO : 1;               // Bit 0: Continue-I/O flag retained from the reconstructed layout.
            ULONG LowPowerMode : 1;             // Bit 1: Low-power flag retained from the reconstructed layout.
            ULONG UseScenarioTimeouts : 1;      // Bit 2: Selects scenario-timeout and trickled-prefetch processing.
            ULONG OtherFlags : 3;               // Accepted bits whose semantics are not yet identified.
            ULONG ReservedFlags : 2;            // Must be zero.
            ULONG ScenarioType : 8;             // PF_PHASED_SCENARIO_TYPE, 0..5.
            ULONG Spare : 16;                   // Reserved field; initialize to zero and do not interpret on output.
        };
    };
    ULONG FilePrefetchCount;                    // Output count of files considered for prefetching.
    ULONG MetadataPrefetchCount;                // Output count of metadata prefetch operations.
    ULONG PrivatePrefetchCount;                 // Output count of private-source prefetch operations.
    ULONG FilePageCount;                        // Output page count for the first file-prefetch pass.
    ULONG FilePageCountSecondPass;              // Output page count for the second file-prefetch pass.
    ULONG PrivatePageCount;                     // Output count of private pages submitted for prefetching.
    ULONG MetadataPrefetchTime;                 // Milliseconds.
    ULONG FilePrefetchTime;                     // Milliseconds.
    ULONG FilePrefetchTimeSecondPass;           // Milliseconds.
    ULONG PrivatePrefetchTime;                  // Milliseconds.
    ULONG Reserved5;                            // Reserved field; initialize to zero and do not interpret on output.
} PF_PREFETCH_REQUEST, *PPF_PREFETCH_REQUEST;

#endif
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