- Allocate memory for mdl's for paging io  from stack instead of the non paged pool.

reactos/ntoskrnl/mm

diff -u -r1.46 -r1.47
--- pagefile.c	6 Jun 2004 07:52:22 -0000	1.46
+++ pagefile.c	6 Jun 2004 09:13:21 -0000	1.47
@@ -16,7 +16,7 @@

  *  along with this program; if not, write to the Free Software
  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */

-/* $Id: pagefile.c,v 1.46 2004/06/06 07:52:22 hbirr Exp $

+/* $Id: pagefile.c,v 1.47 2004/06/06 09:13:21 hbirr Exp $

  *
  * PROJECT:         ReactOS kernel
  * FILE:            ntoskrnl/mm/pagefile.c

@@ -191,13 +191,15 @@

 #endif
 }
 

-NTSTATUS MmWriteToSwapPage(SWAPENTRY SwapEntry, PMDL Mdl)

+NTSTATUS MmWriteToSwapPage(SWAPENTRY SwapEntry, PHYSICAL_ADDRESS* Page)

 {
    ULONG i, offset;
    LARGE_INTEGER file_offset;
    IO_STATUS_BLOCK Iosb;
    NTSTATUS Status;
    KEVENT Event;

+   UCHAR MdlBase[sizeof(MDL) + sizeof(ULONG)];
+   PMDL Mdl = (PMDL)MdlBase;

 
    DPRINT("MmWriteToSwapPage\n");
 

@@ -222,6 +224,9 @@

       KEBUGCHECK(0);
    }
 

+   MmInitializeMdl(Mdl, NULL, PAGE_SIZE);
+   MmBuildMdlFromPages(Mdl, (PULONG)Page);
+

    file_offset.QuadPart = offset * PAGE_SIZE;
    file_offset = MmGetOffsetPageFile(PagingFileList[i]->RetrievalPointers, file_offset);
 

@@ -234,18 +239,21 @@

    if (Status == STATUS_PENDING)
    {
       KeWaitForSingleObject(&Event, Executive, KernelMode, FALSE, NULL);

-      return(Iosb.Status);

+      Status = Iosb.Status;

    }

+   MmUnmapLockedPages(Mdl->MappedSystemVa, Mdl);            

    return(Status);
 }
 

-NTSTATUS MmReadFromSwapPage(SWAPENTRY SwapEntry, PMDL Mdl)

+NTSTATUS MmReadFromSwapPage(SWAPENTRY SwapEntry, PHYSICAL_ADDRESS* Page)

 {
    ULONG i, offset;
    LARGE_INTEGER file_offset;
    IO_STATUS_BLOCK Iosb;
    NTSTATUS Status;
    KEVENT Event;

+   UCHAR MdlBase[sizeof(MDL) + sizeof(ULONG)];
+   PMDL Mdl = (PMDL)MdlBase;

 
    DPRINT("MmReadFromSwapPage\n");
 

@@ -270,6 +278,9 @@

       KEBUGCHECK(0);
    }
 

+   MmInitializeMdl(Mdl, NULL, PAGE_SIZE);
+   MmBuildMdlFromPages(Mdl, (PULONG)Page);
+

    file_offset.QuadPart = offset * PAGE_SIZE;
    file_offset = MmGetOffsetPageFile(PagingFileList[i]->RetrievalPointers, file_offset);
 

@@ -282,8 +293,9 @@

    if (Status == STATUS_PENDING)
    {
       KeWaitForSingleObject(&Event, Executive, KernelMode, FALSE, NULL);

-      return(Iosb.Status);

+      Status = Iosb.Status;

    }

+   MmUnmapLockedPages(Mdl->MappedSystemVa, Mdl);            

    return(Status);
 }
 

@@ -538,14 +550,8 @@

    }
 
    /* Initialize the MDL. */

-   Mdl->Next = NULL;
-   Mdl->Size = sizeof(MDL) + sizeof(PVOID);
-   Mdl->MdlFlags = MDL_SOURCE_IS_NONPAGED_POOL;
-   Mdl->Process = NULL;
-   Mdl->MappedSystemVa = MmCoreDumpPageFrame;
-   Mdl->StartVa = NULL;
-   Mdl->ByteCount = PAGE_SIZE;
-   Mdl->ByteOffset = 0;

+   MmInitializeMdl(Mdl, MmCoreDumpPageFrame, PAGE_SIZE);
+   Mdl->MdlFlags = MDL_PAGES_LOCKED|MDL_IO_PAGE_READ|MDL_SOURCE_IS_NONPAGED_POOL;

    MdlMap = (PULONG)(Mdl + 1);