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//0x58 bytes (sizeof)
struct _MMPAGE_FILE_EXPANSION
{
    struct _SEGMENT* Segment;                                               //0x0
    struct _LIST_ENTRY DereferenceList;                                     //0x8
    struct _MI_PARTITION* Partition;                                        //0x18
    ULONGLONG RequestedExpansionSize;                                       //0x20
    ULONGLONG ActualExpansion;                                              //0x28
    struct _KEVENT Event;                                                   //0x30
    volatile LONG InProgress;                                               //0x48
    union
    {
        ULONG LongFlags;                                                    //0x4c
        struct _MMPAGE_FILE_EXPANSION_FLAGS Flags;                          //0x4c
    } u1;                                                                   //0x4c
    VOID** volatile ActiveEntry;                                            //0x50
};