ntoskrnl/cc/mdl.c

   1 /*
   2  * COPYRIGHT:       See COPYING in the top level directory
   3  * PROJECT:         ReactOS kernel
   4  * FILE:            ntoskrnl/cc/fs.c
   5  * PURPOSE:         Implements MDL Cache Manager Functions
   6  *
   7  * PROGRAMMERS:     Alex Ionescu
   8  */
   9
  10 /* INCLUDES ******************************************************************/
  11
  12 #include <ntoskrnl.h>
  13 #define NDEBUG
  14 #include <debug.h>
  15
  16 /* FUNCTIONS *****************************************************************/
  17
  18 /*
  19  * @implemented
  20  */
  21 VOID
  22 NTAPI
  23 CcMdlRead (
  24     IN PFILE_OBJECT FileObject,
  25     IN PLARGE_INTEGER FileOffset,
  26     IN ULONG Length,
  27     OUT PMDL * MdlChain,
  28     OUT PIO_STATUS_BLOCK IoStatus
  29     )
  30 {
  31     UNIMPLEMENTED;
  32 }
  33
  34 /*
  35  * NAME                            INTERNAL
  36  * CcMdlReadComplete2@8
  37  *
  38  * DESCRIPTION
  39  *
  40  * ARGUMENTS
  41  * MdlChain
  42  * DeviceObject
  43  *
  44  * RETURN VALUE
  45  *  None.
  46  *
  47  * NOTE
  48  *     Used by CcMdlReadComplete@8 and FsRtl
  49  *
  50  */
  51 VOID
  52 NTAPI
  53 CcMdlReadComplete2 (
  54     IN PMDL MemoryDescriptorList,
  55     IN PFILE_OBJECT FileObject)
  56 {
  57     PMDL Mdl;
  58
  59     /* Free MDLs */
  60     while ((Mdl = MemoryDescriptorList))
  61     {
  62         MemoryDescriptorList = Mdl->Next;
  63         MmUnlockPages(Mdl);
  64         IoFreeMdl(Mdl);
  65     }
  66 }
  67
  68 /*
  69  * NAME    EXPORTED
  70  * CcMdlReadComplete@8
  71  *
  72  * DESCRIPTION
  73  *
  74  * ARGUMENTS
  75  *
  76  * RETURN VALUE
  77  * None.
  78  *
  79  * NOTE
  80  * From Bo Branten's ntifs.h v13.
  81  *
  82  * @implemented
  83  */
  84 VOID
  85 NTAPI
  86 CcMdlReadComplete (
  87     IN PFILE_OBJECT FileObject,
  88     IN PMDL MdlChain)
  89 {
  90     PDEVICE_OBJECT DeviceObject = NULL;
  91     PFAST_IO_DISPATCH FastDispatch;
  92
  93     /* Get Fast Dispatch Data */
  94     DeviceObject = IoGetRelatedDeviceObject(FileObject);
  95     FastDispatch = DeviceObject->DriverObject->FastIoDispatch;
  96
  97     /* Check if we support Fast Calls, and check this one */
  98     if (FastDispatch && FastDispatch->MdlReadComplete)
  99     {
 100          /* Use the fast path */
 101         FastDispatch->MdlReadComplete(FileObject,
 102                                       MdlChain,
 103                                       DeviceObject);
 104     }
 105
 106     /* Use slow path */
 107     CcMdlReadComplete2(MdlChain, FileObject);
 108 }
 109
 110 /*
 111  * @implemented
 112  */
 113 VOID
 114 NTAPI
 115 CcMdlWriteComplete (
 116     IN PFILE_OBJECT FileObject,
 117     IN PLARGE_INTEGER FileOffset,
 118     IN PMDL MdlChain)
 119 {
 120     PDEVICE_OBJECT DeviceObject = NULL;
 121     PFAST_IO_DISPATCH FastDispatch;
 122
 123     /* Get Fast Dispatch Data */
 124     DeviceObject = IoGetRelatedDeviceObject(FileObject);
 125     FastDispatch = DeviceObject->DriverObject->FastIoDispatch;
 126
 127     /* Check if we support Fast Calls, and check this one */
 128     if (FastDispatch && FastDispatch->MdlWriteComplete)
 129     {
 130          /* Use the fast path */
 131         FastDispatch->MdlWriteComplete(FileObject,
 132                                        FileOffset,
 133                                        MdlChain,
 134                                        DeviceObject);
 135     }
 136
 137     /* Use slow path */
 138     CcMdlWriteComplete2(FileObject,FileOffset, MdlChain);
 139 }
 140
 141 VOID
 142 NTAPI
 143 CcMdlWriteComplete2 (
 144     IN PFILE_OBJECT FileObject,
 145     IN PLARGE_INTEGER FileOffset,
 146     IN PMDL MdlChain)
 147 {
 148     UNIMPLEMENTED;
 149 }
 150
 151 /*
 152  * @unimplemented
 153  */
 154 VOID
 155 NTAPI
 156 CcMdlWriteAbort (
 157     IN PFILE_OBJECT FileObject,
 158     IN PMDL MdlChain)
 159 {
 160     UNIMPLEMENTED;
 161 }
 162
 163 /*
 164  * @unimplemented
 165  */
 166 VOID
 167 NTAPI
 168 CcPrepareMdlWrite (
 169     IN PFILE_OBJECT FileObject,
 170     IN PLARGE_INTEGER FileOffset,
 171     IN ULONG Length,
 172     OUT PMDL * MdlChain,
 173     OUT PIO_STATUS_BLOCK IoStatus)
 174 {
 175     UNIMPLEMENTED;
 176 }