usbtype.h

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//
// Type definitions for USB Mass Storage Driver Sample
//

//Typedefs for exported functions in WDM driver
typedef DWORD (_stdcall *USBSTOR_GETNEXTPDO)(PVOID);
typedef PVOID (_stdcall *USBSTOR_STARTREQUEST)(PIOPACKET);
typedef PVOID (_stdcall *USBSTOR_REGISTERHANDLER)(DWORD, PVOID);

//Typedef for IOS callback handler
typedef VOID  (*PIOPCB) (pIOP);