Added some fixes for accessing the page file.

[reactos.git] / reactos / drivers / fs / vfat / create.c

diff --git a/reactos/drivers/fs/vfat/create.c b/reactos/drivers/fs/vfat/create.c
index a1896c8..aa67ad5 100644 (file)
--- a/reactos/drivers/fs/vfat/create.c
+++ b/reactos/drivers/fs/vfat/create.c
@@ -1,4 +1,4 @@
-/* $Id: create.c,v 1.35 2002/01/08 00:49:01 dwelch Exp $
+/* $Id: create.c,v 1.36 2002/01/15 21:54:51 hbirr Exp $
  *
  * COPYRIGHT:        See COPYING in the top level directory
  * PROJECT:          ReactOS kernel
@@ -643,7 +643,19 @@ VfatCreateFile (PDEVICE_OBJECT DeviceObject, PIRP Irp)
                      (Stack->Parameters.
                       Create.FileAttributes & FILE_ATTRIBUTE_VALID_FLAGS));
          if (NT_SUCCESS (Status))
+         {
+               if (PagingFileCreate)
+               {
+                 DPRINT("Creating a new paging file.\n");
+                 pCcb = FileObject->FsContext2;
+                 pFcb = pCcb->pFcb;
+             pFcb->Flags |= FCB_IS_PAGE_FILE;
+             pFcb->FatChainSize = 0;
+                 pFcb->FatChain = NULL;
+               }
+
            Irp->IoStatus.Information = FILE_CREATED;
+         }
          /* FIXME set size if AllocationSize requested */
          /* FIXME set extended attributes? */
          /* FIXME set share access */
@@ -703,12 +715,15 @@ VfatCreateFile (PDEVICE_OBJECT DeviceObject, PIRP Irp)
     if (PagingFileCreate)
       {
        ULONG CurrentCluster, NextCluster, i;
-
+       DPRINT("Open an existing paging file\n");
        pFcb->Flags |= FCB_IS_PAGE_FILE;
        pFcb->FatChainSize = 
-         ((pFcb->entry.FileSize / DeviceExt->BytesPerCluster) + 2);
-       pFcb->FatChain = ExAllocatePool(NonPagedPool, 
+         ((pFcb->entry.FileSize + DeviceExt->BytesPerCluster - 1) / DeviceExt->BytesPerCluster);
+       if (pFcb->FatChainSize)
+       {
+         pFcb->FatChain = ExAllocatePool(NonPagedPool, 
                                        pFcb->FatChainSize * sizeof(ULONG));
+       }
 
        if (DeviceExt->FatType == FAT32)
          {
@@ -721,16 +736,18 @@ VfatCreateFile (PDEVICE_OBJECT DeviceObject, PIRP Irp)
          }
 
        i = 0;
-       while (CurrentCluster != 0xffffffff)
-         {
-           Status = GetNextCluster (DeviceExt, CurrentCluster, &NextCluster, 
+       if (pFcb->FatChainSize)
+       {
+               while (CurrentCluster != 0xffffffff)
+               {
+                 pFcb->FatChain[i] = CurrentCluster;   
+             Status = GetNextCluster (DeviceExt, CurrentCluster, &NextCluster, 
                                     FALSE);
-           pFcb->FatChain[i] = NextCluster;
-           i++;
-           CurrentCluster = NextCluster;
-         }
-       pFcb->FatChain[i] = 0xFFFFFFFF;
+             i++;
+             CurrentCluster = NextCluster;
+               }
       }
+       }
 
     /*
      * Check the file has the requested attributes