- Lock the MainResource if we overwrite or supersede an existing file.  
- Use given allocation size, if we overwrite or supersede an existing file.

Modified: trunk/reactos/drivers/fs/vfat/create.c

--- trunk/reactos/drivers/fs/vfat/create.c	2005-11-27 15:37:06 UTC (rev 19688)
+++ trunk/reactos/drivers/fs/vfat/create.c	2005-11-27 15:44:36 UTC (rev 19689)
@@ -442,7 +442,6 @@

 	PVFATFCB ParentFcb;
 	PWCHAR c, last;
 	BOOLEAN PagingFileCreate = FALSE;

-	LARGE_INTEGER AllocationSize;

 	BOOLEAN Dots;
 	UNICODE_STRING FileNameU;
         UNICODE_STRING PathNameU;
@@ -565,9 +564,9 @@

 	if (!NT_SUCCESS (Status))
 	{
 		if (RequestedDisposition == FILE_CREATE ||

-			RequestedDisposition == FILE_OPEN_IF ||
-			RequestedDisposition == FILE_OVERWRITE_IF ||
-			RequestedDisposition == FILE_SUPERSEDE)

+		    RequestedDisposition == FILE_OPEN_IF ||
+		    RequestedDisposition == FILE_OVERWRITE_IF ||
+		    RequestedDisposition == FILE_SUPERSEDE)

 		{
 			ULONG Attributes;
 			Attributes = Stack->Parameters.Create.FileAttributes;
@@ -586,7 +585,6 @@

 				}
 
 				Irp->IoStatus.Information = FILE_CREATED;

-

 				VfatSetAllocationSizeInformation(FileObject,
 					pFcb,
 					DeviceExt,
@@ -691,13 +689,15 @@

 
 
 		if (RequestedDisposition == FILE_OVERWRITE ||

-			RequestedDisposition == FILE_OVERWRITE_IF)

+		    RequestedDisposition == FILE_OVERWRITE_IF ||
+		    RequestedDisposition == FILE_SUPERSEDE)

 		{

-			AllocationSize.QuadPart = 0;

+                        ExAcquireResourceExclusiveLite(&(pFcb->MainResource), TRUE);

 			Status = VfatSetAllocationSizeInformation (FileObject,

-				pFcb,
-				DeviceExt,
-				&AllocationSize);

+				                                   pFcb,
+				                                   DeviceExt,
+				                                   &Irp->Overlay.AllocationSize);
+                        ExReleaseResourceLite(&(pFcb->MainResource));

 			if (!NT_SUCCESS (Status))
 			{
 				VfatCloseFile (DeviceExt, FileObject);
@@ -705,15 +705,12 @@

 			}
 		}
 

-
-		/* Supersede the file */

 		if (RequestedDisposition == FILE_SUPERSEDE)
 		{

-			AllocationSize.QuadPart = 0;
-			VfatSetAllocationSizeInformation(FileObject, pFcb, DeviceExt, &AllocationSize);

 			Irp->IoStatus.Information = FILE_SUPERSEDED;
 		}

-		else if (RequestedDisposition == FILE_OVERWRITE || RequestedDisposition == FILE_OVERWRITE_IF)

+		else if (RequestedDisposition == FILE_OVERWRITE || 
+		         RequestedDisposition == FILE_OVERWRITE_IF)

 		{
 			Irp->IoStatus.Information = FILE_OVERWRITTEN;
 		}