sdk/include/ddk/buffring.h

   1 #ifndef __BUFFRING_H__
   2 #define __BUFFRING_H__
   3
   4 #define RX_REQUEST_PREPARED_FOR_HANDLING 0x10000000
   5
   6 typedef struct _CHANGE_BUFFERING_STATE_REQUEST_
   7 {
   8     LIST_ENTRY ListEntry;
   9     ULONG Flags;
  10 #if (_WIN32_WINNT < 0x0600)
  11     PSRV_CALL pSrvCall;
  12 #endif
  13     PSRV_OPEN SrvOpen;
  14     PVOID SrvOpenKey;
  15     PVOID MRxContext;
  16 } CHANGE_BUFFERING_STATE_REQUEST, *PCHANGE_BUFFERING_STATE_REQUEST;
  17
  18 typedef struct _RX_BUFFERING_MANAGER_
  19 {
  20     BOOLEAN DispatcherActive;
  21     BOOLEAN HandlerInactive;
  22     BOOLEAN LastChanceHandlerActive;
  23     UCHAR Pad;
  24     KSPIN_LOCK SpinLock;
  25     volatile LONG CumulativeNumberOfBufferingChangeRequests;
  26     LONG NumberOfUnhandledRequests;
  27     LONG NumberOfUndispatchedRequests;
  28     volatile LONG NumberOfOutstandingOpens;
  29     LIST_ENTRY DispatcherList;
  30     LIST_ENTRY HandlerList;
  31     LIST_ENTRY LastChanceHandlerList;
  32     RX_WORK_QUEUE_ITEM DispatcherWorkItem;
  33     RX_WORK_QUEUE_ITEM HandlerWorkItem;
  34     RX_WORK_QUEUE_ITEM LastChanceHandlerWorkItem;
  35     FAST_MUTEX Mutex;
  36     LIST_ENTRY SrvOpenLists[1];
  37 } RX_BUFFERING_MANAGER, *PRX_BUFFERING_MANAGER;
  38
  39 #if (_WIN32_WINNT >= 0x0600)
  40 #define RxAcquireBufferingManagerMutex(BufMan) ExAcquireFastMutex(&(BufMan)->Mutex)
  41 #else
  42 #define RxAcquireBufferingManagerMutex(BufMan)          \
  43     {                                                   \
  44         if (!ExTryToAcquireFastMutex(&(BufMan)->Mutex)) \
  45         {                                               \
  46             ExAcquireFastMutex(&(BufMan)->Mutex);       \
  47         }                                               \
  48     }
  49 #endif
  50 #define RxReleaseBufferingManagerMutex(BufMan) ExReleaseFastMutex(&(BufMan)->Mutex)
  51
  52 VOID
  53 RxpProcessChangeBufferingStateRequests(
  54     PSRV_CALL SrvCall,
  55     BOOLEAN UpdateHandlerState);
  56
  57 VOID
  58 NTAPI
  59 RxProcessChangeBufferingStateRequests(
  60     _In_ PVOID SrvCall);
  61
  62 VOID
  63 RxProcessFcbChangeBufferingStateRequest(
  64     _In_ PFCB Fcb);
  65
  66 VOID
  67 RxPurgeChangeBufferingStateRequestsForSrvOpen(
  68     _In_ PSRV_OPEN SrvOpen);
  69
  70 VOID
  71 RxCompleteSrvOpenKeyAssociation(
  72     _Inout_ PSRV_OPEN SrvOpen);
  73
  74 VOID
  75 RxInitiateSrvOpenKeyAssociation(
  76    _Inout_ PSRV_OPEN SrvOpen);
  77
  78 NTSTATUS
  79 RxInitializeBufferingManager(
  80    _In_ PSRV_CALL SrvCall);
  81
  82 NTSTATUS
  83 RxTearDownBufferingManager(
  84    _In_ PSRV_CALL SrvCall);
  85
  86 NTSTATUS
  87 RxFlushFcbInSystemCache(
  88     _In_ PFCB Fcb,
  89     _In_ BOOLEAN SynchronizeWithLazyWriter);
  90
  91 NTSTATUS
  92 RxPurgeFcbInSystemCache(
  93     _In_ PFCB Fcb,
  94     _In_ PLARGE_INTEGER FileOffset OPTIONAL,
  95     _In_ ULONG Length,
  96     _In_ BOOLEAN UninitializeCacheMaps,
  97     _In_ BOOLEAN FlushFile);
  98
  99 #endif