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 PFILE_OBJECT FileObject,
  55     IN PMDL MemoryDescriptorList
  56 )
  57 {
  58     PMDL Mdl;
  59
  60     /* Free MDLs */
  61     while ((Mdl = MemoryDescriptorList))
  62     {
  63         MemoryDescriptorList = Mdl->Next;
  64         MmUnlockPages(Mdl);
  65         IoFreeMdl(Mdl);
  66     }
  67 }
  68
  69 /*
  70  * NAME    EXPORTED
  71  * CcMdlReadComplete@8
  72  *
  73  * DESCRIPTION
  74  *
  75  * ARGUMENTS
  76  *
  77  * RETURN VALUE
  78  * None.
  79  *
  80  * NOTE
  81  * From Bo Branten's ntifs.h v13.
  82  *
  83  * @implemented
  84  */
  85 VOID
  86 NTAPI
  87 CcMdlReadComplete (
  88     IN PFILE_OBJECT FileObject,
  89     IN PMDL MdlChain)
  90 {
  91     PDEVICE_OBJECT DeviceObject = NULL;
  92     PFAST_IO_DISPATCH FastDispatch;
  93
  94     /* Get Fast Dispatch Data */
  95     DeviceObject = IoGetRelatedDeviceObject(FileObject);
  96     FastDispatch = DeviceObject->DriverObject->FastIoDispatch;
  97
  98     /* Check if we support Fast Calls, and check this one */
  99     if (FastDispatch && FastDispatch->MdlReadComplete)
 100     {
 101          /* Use the fast path */
 102         FastDispatch->MdlReadComplete(FileObject,
 103                                       MdlChain,
 104                                       DeviceObject);
 105     }
 106
 107     /* Use slow path */
 108     CcMdlReadComplete2(FileObject, MdlChain);
 109 }
 110
 111 /*
 112  * @implemented
 113  */
 114 VOID
 115 NTAPI
 116 CcMdlWriteComplete (
 117     IN PFILE_OBJECT FileObject,
 118     IN PLARGE_INTEGER FileOffset,
 119     IN PMDL MdlChain)
 120 {
 121     PDEVICE_OBJECT DeviceObject = NULL;
 122     PFAST_IO_DISPATCH FastDispatch;
 123
 124     /* Get Fast Dispatch Data */
 125     DeviceObject = IoGetRelatedDeviceObject(FileObject);
 126     FastDispatch = DeviceObject->DriverObject->FastIoDispatch;
 127
 128     /* Check if we support Fast Calls, and check this one */
 129     if (FastDispatch && FastDispatch->MdlWriteComplete)
 130     {
 131          /* Use the fast path */
 132         FastDispatch->MdlWriteComplete(FileObject,
 133                                        FileOffset,
 134                                        MdlChain,
 135                                        DeviceObject);
 136     }
 137
 138     /* Use slow path */
 139     CcMdlWriteComplete2(FileObject,FileOffset, MdlChain);
 140 }
 141
 142 VOID
 143 NTAPI
 144 CcMdlWriteComplete2 (
 145     IN PFILE_OBJECT FileObject,
 146     IN PLARGE_INTEGER FileOffset,
 147     IN PMDL MdlChain)
 148 {
 149     UNIMPLEMENTED;
 150 }
 151
 152 /*
 153  * @unimplemented
 154  */
 155 VOID
 156 NTAPI
 157 CcMdlWriteAbort (
 158     IN PFILE_OBJECT FileObject,
 159     IN PMDL MdlChain)
 160 {
 161     UNIMPLEMENTED;
 162 }
 163
 164 /*
 165  * @unimplemented
 166  */
 167 VOID
 168 NTAPI
 169 CcPrepareMdlWrite (
 170     IN PFILE_OBJECT FileObject,
 171     IN PLARGE_INTEGER FileOffset,
 172     IN ULONG Length,
 173     OUT PMDL * MdlChain,
 174     OUT PIO_STATUS_BLOCK IoStatus)
 175 {
 176     UNIMPLEMENTED;
 177 }