ntoskrnl/cache/mdlsup.c

   1 /*
   2  * COPYRIGHT:       See COPYING in the top level directory
   3  * PROJECT:         ReactOS Kernel
   4  * FILE:            ntoskrnl/cache/logsup.c
   5  * PURPOSE:         Logging and configuration routines
   6  * PROGRAMMERS:     Alex Ionescu (alex.ionescu@reactos.org)
   7  */
   8
   9 /* INCLUDES *******************************************************************/
  10
  11 #include <ntoskrnl.h>
  12 #include "newcc.h"
  13 #define NDEBUG
  14 #include <debug.h>
  15
  16 /* GLOBALS ********************************************************************/
  17
  18 /* FUNCTIONS ******************************************************************/
  19 \f
  20
  21 PMDL
  22 NTAPI
  23 CcpBuildCacheMdl
  24 (PFILE_OBJECT FileObject,
  25  PLARGE_INTEGER FileOffset,
  26  ULONG Length,
  27  PIO_STATUS_BLOCK IOSB)
  28 {
  29         PMDL Mdl;
  30         PVOID Bcb, Buffer;
  31
  32         BOOLEAN Result = CcMapData
  33                 (FileObject,
  34                  FileOffset,
  35                  Length,
  36                  PIN_WAIT,
  37                  &Bcb,
  38                  &Buffer);
  39
  40         if (!Result)
  41         {
  42                 IOSB->Information = 0;
  43                 IOSB->Status = STATUS_UNSUCCESSFUL;
  44                 return NULL;
  45         }
  46
  47         IOSB->Information = Length;
  48         IOSB->Status = STATUS_SUCCESS;
  49
  50         Mdl = IoAllocateMdl
  51                 (Buffer,
  52                  Length,
  53                  FALSE,
  54                  FALSE,
  55                  NULL);
  56
  57         if (!Mdl)
  58         {
  59                 IOSB->Information = 0;
  60                 IOSB->Status = STATUS_NO_MEMORY;
  61                 return NULL;
  62         }
  63
  64         IOSB->Information = Length;
  65         IOSB->Status = STATUS_SUCCESS;
  66
  67         return Mdl;
  68 }
  69
  70 VOID
  71 NTAPI
  72 CcMdlRead(IN PFILE_OBJECT FileObject,
  73           IN PLARGE_INTEGER FileOffset,
  74           IN ULONG Length,
  75           OUT PMDL *MdlChain,
  76           OUT PIO_STATUS_BLOCK IoStatus)
  77 {
  78         *MdlChain = CcpBuildCacheMdl
  79                 (FileObject,
  80                  FileOffset,
  81                  Length,
  82                  IoStatus);
  83 }
  84 \f
  85 VOID
  86 NTAPI
  87 CcMdlReadComplete(IN PFILE_OBJECT FileObject,
  88                   IN PMDL MdlChain)
  89 {
  90         IoFreeMdl(MdlChain);
  91 }
  92
  93 VOID
  94 NTAPI
  95 CcMdlReadComplete2(IN PMDL MdlChain,
  96                                    IN PFILE_OBJECT FileObject)
  97 {
  98         DPRINT("Not sure\n");
  99 }
 100 \f
 101 VOID
 102 NTAPI
 103 CcPrepareMdlWrite(IN PFILE_OBJECT FileObject,
 104                   IN PLARGE_INTEGER FileOffset,
 105                   IN ULONG Length,
 106                   OUT PMDL *MdlChain,
 107                   OUT PIO_STATUS_BLOCK IoStatus)
 108 {
 109         *MdlChain = CcpBuildCacheMdl
 110                 (FileObject,
 111                  FileOffset,
 112                  Length,
 113                  IoStatus);
 114 }
 115
 116 VOID
 117 NTAPI
 118 CcMdlWriteComplete(IN PFILE_OBJECT FileObject,
 119                    IN PLARGE_INTEGER FileOffset,
 120                    IN PMDL MdlChain)
 121 {
 122         IoFreeMdl(MdlChain);
 123 }
 124
 125 VOID
 126 NTAPI
 127 CcMdlWriteComplete2(IN PFILE_OBJECT FileObject,
 128                     IN PLARGE_INTEGER FileOffset,
 129                     IN PMDL MdlChain)
 130 {
 131         DPRINT("Not sure\n");
 132 }
 133
 134 VOID
 135 NTAPI
 136 CcMdlWriteAbort(IN PFILE_OBJECT FileObject,
 137                 IN PMDL MdlChain)
 138 {
 139         ASSERT(FALSE);
 140         IoFreeMdl(MdlChain);
 141 }
 142
 143 /* EOF */