Index: close.c
===================================================================
--- drivers/filesystems/fastfat/close.c	(revision 65165)
+++ drivers/filesystems/fastfat/close.c	(working copy)
@@ -42,7 +42,7 @@
     if (pFcb->Flags & FCB_IS_VOLUME)
     {
         DPRINT1("Volume\n");
-        pFcb->RefCount--;
+        vfatReleaseFCB(DeviceExt, pFcb);
         FileObject->FsContext2 = NULL;
     }
     else
Index: fcb.c
===================================================================
--- drivers/filesystems/fastfat/fcb.c	(revision 65165)
+++ drivers/filesystems/fastfat/fcb.c	(working copy)
@@ -294,6 +294,7 @@
 {
     ASSERT(ExIsResourceAcquiredExclusive(&pVCB->DirResource));
 
+    ASSERT(pFCB->RefCount > 0);
     ++pFCB->RefCount;
 }
 
@@ -311,6 +312,7 @@
 
     while (pFCB)
     {
+        ASSERT(pFCB->RefCount > 0);
         pFCB->RefCount--;
         if (pFCB->RefCount == 0)
         {
@@ -508,7 +510,7 @@
     _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
     {
         status = _SEH2_GetExceptionCode();
-        fcb->RefCount--;
+        vfatReleaseFCB(vcb, fcb);
         fcb->FileObject = NULL;
         ExFreeToNPagedLookasideList(&VfatGlobalData->CcbLookasideList, newCCB);
         ObDereferenceObject(fileObject);
@@ -661,7 +663,9 @@
     rcFCB->RFCB.FileSize.QuadPart = Size;
     rcFCB->RFCB.ValidDataLength.QuadPart = Size;
     rcFCB->RFCB.AllocationSize.QuadPart = ROUND_UP(Size, vcb->FatInfo.BytesPerCluster);
-    vfatGrabFCB(vcb, rcFCB);
+    ASSERT(ExIsResourceAcquiredExclusiveLite(&vcb->DirResource));
+    ASSERT(rcFCB->RefCount == 0);
+    rcFCB->RefCount = 1;
     if (vfatFCBIsDirectory(rcFCB))
     {
         vfatFCBInitializeCacheFromVolume(vcb, rcFCB);