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//0x20 bytes (sizeof)
struct _VOLUME_CACHE_MAP
{
    SHORT NodeTypeCode;                                                     //0x0
    SHORT NodeByteCode;                                                     //0x2
    ULONG UseCount;                                                         //0x4
    struct _DEVICE_OBJECT* DeviceObject;                                    //0x8
    struct _LIST_ENTRY VolumeCacheMapLinks;                                 //0xc
    ULONG Flags;                                                            //0x14
    ULONG DirtyPages;                                                       //0x18
    ULONG PagesQueuedToDisk;                                                //0x1c
};