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     CCTRACE(CC_API_DEBUG, "FileObject=%p FileOffset=%I64d Length=%lu\n",
  32         FileObject, FileOffset->QuadPart, Length);
  33
  34     UNIMPLEMENTED;
  35 }
  36
  37 /*
  38  * NAME                            INTERNAL
  39  * CcMdlReadComplete2@8
  40  *
  41  * DESCRIPTION
  42  *
  43  * ARGUMENTS
  44  * MdlChain
  45  * DeviceObject
  46  *
  47  * RETURN VALUE
  48  *  None.
  49  *
  50  * NOTE
  51  *     Used by CcMdlReadComplete@8 and FsRtl
  52  *
  53  */
  54 VOID
  55 NTAPI
  56 CcMdlReadComplete2 (
  57     IN PFILE_OBJECT FileObject,
  58     IN PMDL MemoryDescriptorList
  59 )
  60 {
  61     PMDL Mdl;
  62
  63     /* Free MDLs */
  64     while ((Mdl = MemoryDescriptorList))
  65     {
  66         MemoryDescriptorList = Mdl->Next;
  67         MmUnlockPages(Mdl);
  68         IoFreeMdl(Mdl);
  69     }
  70 }
  71
  72 /*
  73  * NAME    EXPORTED
  74  * CcMdlReadComplete@8
  75  *
  76  * DESCRIPTION
  77  *
  78  * ARGUMENTS
  79  *
  80  * RETURN VALUE
  81  * None.
  82  *
  83  * NOTE
  84  * From Bo Branten's ntifs.h v13.
  85  *
  86  * @implemented
  87  */
  88 VOID
  89 NTAPI
  90 CcMdlReadComplete (
  91     IN PFILE_OBJECT FileObject,
  92     IN PMDL MdlChain)
  93 {
  94     PDEVICE_OBJECT DeviceObject = NULL;
  95     PFAST_IO_DISPATCH FastDispatch;
  96
  97     /* Get Fast Dispatch Data */
  98     DeviceObject = IoGetRelatedDeviceObject(FileObject);
  99     FastDispatch = DeviceObject->DriverObject->FastIoDispatch;
 100
 101     /* Check if we support Fast Calls, and check this one */
 102     if (FastDispatch && FastDispatch->MdlReadComplete)
 103     {
 104          /* Use the fast path */
 105         FastDispatch->MdlReadComplete(FileObject,
 106                                       MdlChain,
 107                                       DeviceObject);
 108     }
 109
 110     /* Use slow path */
 111     CcMdlReadComplete2(FileObject, MdlChain);
 112 }
 113
 114 /*
 115  * @implemented
 116  */
 117 VOID
 118 NTAPI
 119 CcMdlWriteComplete (
 120     IN PFILE_OBJECT FileObject,
 121     IN PLARGE_INTEGER FileOffset,
 122     IN PMDL MdlChain)
 123 {
 124     PDEVICE_OBJECT DeviceObject = NULL;
 125     PFAST_IO_DISPATCH FastDispatch;
 126
 127     /* Get Fast Dispatch Data */
 128     DeviceObject = IoGetRelatedDeviceObject(FileObject);
 129     FastDispatch = DeviceObject->DriverObject->FastIoDispatch;
 130
 131     /* Check if we support Fast Calls, and check this one */
 132     if (FastDispatch && FastDispatch->MdlWriteComplete)
 133     {
 134          /* Use the fast path */
 135         FastDispatch->MdlWriteComplete(FileObject,
 136                                        FileOffset,
 137                                        MdlChain,
 138                                        DeviceObject);
 139     }
 140
 141     /* Use slow path */
 142     CcMdlWriteComplete2(FileObject,FileOffset, MdlChain);
 143 }
 144
 145 VOID
 146 NTAPI
 147 CcMdlWriteComplete2 (
 148     IN PFILE_OBJECT FileObject,
 149     IN PLARGE_INTEGER FileOffset,
 150     IN PMDL MdlChain)
 151 {
 152     UNIMPLEMENTED;
 153 }
 154
 155 /*
 156  * @unimplemented
 157  */
 158 VOID
 159 NTAPI
 160 CcMdlWriteAbort (
 161     IN PFILE_OBJECT FileObject,
 162     IN PMDL MdlChain)
 163 {
 164     UNIMPLEMENTED;
 165 }
 166
 167 /*
 168  * @unimplemented
 169  */
 170 VOID
 171 NTAPI
 172 CcPrepareMdlWrite (
 173     IN PFILE_OBJECT FileObject,
 174     IN PLARGE_INTEGER FileOffset,
 175     IN ULONG Length,
 176     OUT PMDL * MdlChain,
 177     OUT PIO_STATUS_BLOCK IoStatus)
 178 {
 179     CCTRACE(CC_API_DEBUG, "FileObject=%p FileOffset=%I64d Length=%lu\n",
 180         FileObject, FileOffset->QuadPart, Length);
 181
 182     UNIMPLEMENTED;
 183 }