Implemented CcMapdata(), CcUnpinData() and CsSetDirtyPinnedData().

svn path=/trunk/; revision=2276

reactos/ntoskrnl/cc/pin.c

@@ -0,0 +1,122 @@
+/* $Id: pin.c,v 1.1 2001/10/10 21:49:15 hbirr Exp $
+ *
+ * COPYRIGHT:       See COPYING in the top level directory
+ * PROJECT:         ReactOS kernel
+ * FILE:            ntoskrnl/cc/pin.c
+ * PURPOSE:         Implements cache managers pinning interface
+ * PROGRAMMER:      Hartmut Birr
+ * UPDATE HISTORY:
+ *                  Created 05.10.2001
+ */
+
+/* INCLUDES ******************************************************************/
+
+#include <ddk/ntddk.h>
+#include <ddk/ntifs.h>
+#include <internal/mm.h>
+#include <internal/cc.h>
+#include <internal/pool.h>
+#include <internal/io.h>
+#include <ntos/minmax.h>
+
+#define NDEBUG
+#include <internal/debug.h>
+
+/* GLOBALS *******************************************************************/
+
+#define ROUND_DOWN(N, S) ((N) - ((N) % (S)))
+
+/* FUNCTIONS *****************************************************************/
+
+typedef struct _INTERNAL_BCB
+{
+  PUBLIC_BCB PFCB;
+  PCACHE_SEGMENT CacheSegment;
+}
+INTERNAL_BCB, *PINTERNAL_BCB;
+
+BOOLEAN STDCALL
+CcMapData (
+   IN PFILE_OBJECT FileObject,
+   IN PLARGE_INTEGER FileOffset,
+   IN ULONG Length,
+   IN BOOLEAN Wait,
+   OUT PVOID *pBcb,
+   OUT PVOID *pBuffer)
+{
+   ULONG ReadOffset;
+   BOOLEAN Valid;
+   PBCB Bcb;
+   PCACHE_SEGMENT CacheSeg;
+   NTSTATUS Status;
+   PINTERNAL_BCB iBcb;
+
+   DPRINT("CcMapData(FileObject %x, FileOffset %d, Length %d, Wait %d,"
+           " pBcb %x, pBuffer %x)\n", FileObject, (ULONG)FileOffset->QuadPart,
+           Length, Wait, pBcb, pBuffer);
+
+   ReadOffset = FileOffset->QuadPart;
+   Bcb = ((REACTOS_COMMON_FCB_HEADER*)FileObject->FsContext)->Bcb;
+
+   DPRINT("AllocationSize %d, FileSize %d\n",
+         (ULONG)Bcb->AllocationSize.QuadPart,
+         (ULONG)Bcb->FileSize.QuadPart);
+
+   if (ReadOffset % Bcb->CacheSegmentSize + Length > Bcb->CacheSegmentSize)
+   {
+      return FALSE;
+   }
+   Status = CcRosRequestCacheSegment(Bcb,
+               ROUND_DOWN (ReadOffset, Bcb->CacheSegmentSize),
+               pBuffer,
+               &Valid,
+               &CacheSeg);
+   if (!NT_SUCCESS(Status))
+   {
+      return FALSE;
+   }
+   if (!Valid)
+   {
+      if (!Wait)
+      {
+          CcRosReleaseCacheSegment(Bcb, CacheSeg, FALSE);
+	      return FALSE;
+      }
+      if (!NT_SUCCESS(ReadCacheSegment(CacheSeg)))
+      {
+        return FALSE;
+      }
+   }
+   *pBuffer += ReadOffset % Bcb->CacheSegmentSize;
+   iBcb = ExAllocatePool (NonPagedPool, sizeof(INTERNAL_BCB));
+   if (iBcb == NULL)
+   {
+     CcRosReleaseCacheSegment(Bcb, CacheSeg, TRUE);
+     return FALSE;
+   }
+   iBcb->CacheSegment = CacheSeg;
+   iBcb->PFCB.MappedLength = Length;
+   iBcb->PFCB.MappedFileOffset.QuadPart = FileOffset->QuadPart;
+   *pBcb = (PVOID)iBcb;
+   return TRUE;
+}
+
+VOID STDCALL
+CcUnpinData (
+   IN PVOID Bcb)
+{
+   PINTERNAL_BCB iBcb = Bcb;
+   CcRosReleaseCacheSegment(iBcb->CacheSegment->Bcb, iBcb->CacheSegment, TRUE);
+   ExFreePool(iBcb);
+}
+
+VOID STDCALL
+CcSetDirtyPinnedData (
+    IN PVOID Bcb,
+    IN PLARGE_INTEGER Lsn)
+{
+   PINTERNAL_BCB iBcb = Bcb;
+   // FIXME: write only the modifyed 4-pages back
+   WriteCacheSegment(iBcb->CacheSegment);
+}
+