typedef struct _MMPAGING_FILE
{
     ULONG Size;
     ULONG MaximumSize;
     ULONG MinimumSize;
     ULONG FreeSpace;
     ULONG PeakUsage;
     ULONG HighestPage;
     PFILE_OBJECT File;
     PMMMOD_WRITER_MDL_ENTRY Entry[2];
     UNICODE_STRING PageFileName;
     PRTL_BITMAP Bitmap;
     ULONG BitmapHint;
     ULONG LastAllocationSize;
     ULONG PageFileNumber: 4;
     ULONG BootPartition: 1;
     ULONG Spare0: 11;
     ULONG AdriftMdls: 1;
     ULONG Spare1: 15;
     PVOID FileHandle;
     SLIST_HEADER AvailableList;
     SLIST_HEADER NeedProcessingList;
} MMPAGING_FILE, *PMMPAGING_FILE;

Windows Vista Kernel Structures