#endif
+#define ENSC_STRUCT_IDX(STRUCT,ATTR) \
+ ((char*)(&(STRUCT).ATTR) - (char*)(&(STRUCT)))
+#define ENSC_SAME_STRUCT_IDX(LHS,RHS,ATTR) \
+ (ENSC_STRUCT_IDX(LHS,ATTR) == ENSC_STRUCT_IDX(RHS,ATTR))
+
#define EXT2_IOC_GETCONTEXT _IOR('x', 1, long)
#define EXT2_IOC_SETCONTEXT _IOW('x', 2, long)