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//0x38 bytes (sizeof)
struct _COMPOSITEFS_LAYER_INFORMATION
{
    ULONG DeviceType;                                                       //0x0
    union
    {
        struct _BLOCK_IO_LAYER_INFORMATION BlockIo;                         //0x8
        struct _CIMFS_LAYER_INFORMATION Cimfs;                              //0x8
    } u;                                                                    //0x8
};