_MDL

Metadatacopy
struct _MDL {
    struct _MDL* Next;/* 0x0  4 */
    short Size;/* 0x4  2 */
    short MdlFlags;/* 0x6  2 */
    struct _EPROCESS* Process;/* 0x8  4 */
    void* MappedSystemVa;/* 0xc  4 */
    void* StartVa;/* 0x10  4 */
    unsigned long ByteCount;/* 0x14  4 */
    unsigned long ByteOffset;/* 0x18  4 */
};
/* source: NT 4.0 DDK (August 1996) PPC LIBCNTPR.LIB CodeView type records; _EPROCESS/_ETHREAD offsets match KDEXTPPC.DLL (NT 4.0 Server CD) */