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