typedef enum _VI_CNT_INDEX_TYPE
{
         VF_CNT_IRPS_TOTAL_COUNT = 0,
         VF_CNT_IRPS_NOT_A_TARGET = 1,
         VF_CNT_IRPS_KMODE = 2,
         VF_CNT_IRPS_SKIP_FLAGS = 3,
         VF_CNT_IRPS_ALREADY_HOOKED = 4,
         VF_CNT_IRPS_WILL_ATTEMPT_CANCEL = 5,
         VF_CNT_IRPS_WILL_NOT_CANCEL = 6,
         VF_CNT_REAL_RACE_FOR_COMPLETION = 7,
         VF_CNT_IRPS_COMPLETED_BY_DRIVER = 8,
         VF_CNT_IRPS_COMPLETED_BY_CANCEL = 9,
         VF_CNT_IRPS_NO_CANCEL_ROUTINE = 10,
         VF_CNT_IRPS_CANCEL_RETURNED_TRUE = 11,
         VF_CNT_IRPS_CANCEL_RETURNED_FALSE = 12,
         VF_CNT_IRP_CANCEL_ROUTINE_NO_CHECK = 13,
         VF_CNT_IRP_CANCEL_ROUTINE_NEVER = 14,
         VF_CNT_IRP_CANCEL_ROUTINE_SOMETIMES = 15,
         VF_CNT_EXTRA_ALLOCS = 16,
         VF_CNT_EXTRA_FREES = 17,
         VF_CNT_CALLS_TO_TIMER_DPC = 18,
         VF_CNT_CALLS_TO_CANCEL_WORKER = 19,
         VF_CNT_FREE_FROM_CANCEL_ROUTINE = 20,
         VF_CNT_FREE_FROM_COMPLETION_ROUTINE = 21,
         VF_CNT_ISSUES_LOGGED = 22,
         VF_CNT_CANCEL_AND_COMPLETE_DIFFERENT_THREADS = 23,
         VF_CNT_IRPS_TOO_MANY_UNDER_WATCH = 24,
         VF_CNT_MAX_INDEX = 25
} VI_CNT_INDEX_TYPE;

Windows Vista Kernel Structures