diff --git a/ntoskrnl/cc/fs.c b/ntoskrnl/cc/fs.c
index fddf76079a3..7be40ae82b4 100644
--- a/ntoskrnl/cc/fs.c
+++ b/ntoskrnl/cc/fs.c
@@ -362,7 +362,7 @@ CcUninitializeCacheMap (
 
         /* And free it */
         FileObject->PrivateCacheMap = NULL;
-        ExFreePoolWithTag(PrivateMap, 'cPcC');
+        ExFreePoolWithTag(PrivateMap, TAG_PRIVATE_CACHE_MAP);
     }
 
     Status = CcRosReleaseFileCache(FileObject);
diff --git a/ntoskrnl/cc/view.c b/ntoskrnl/cc/view.c
index 4933665bd11..0d6d51b2f8e 100644
--- a/ntoskrnl/cc/view.c
+++ b/ntoskrnl/cc/view.c
@@ -1233,6 +1233,8 @@ CcRosInitializeFileCache (
                                    FILE_ALL_ACCESS,
                                    NULL,
                                    KernelMode);
+        SharedCacheMap->NodeTypeCode = NODE_TYPE_SHARED_MAP;
+        SharedCacheMap->NodeByteSize = sizeof(*SharedCacheMap);
         SharedCacheMap->FileObject = FileObject;
         SharedCacheMap->Callbacks = CallBacks;
         SharedCacheMap->LazyWriteContext = LazyWriterContext;
@@ -1255,7 +1257,7 @@ CcRosInitializeFileCache (
         PPRIVATE_CACHE_MAP PrivateMap;
 
         /* Allocate the private cache map for this handle */
-        PrivateMap = ExAllocatePoolWithTag(NonPagedPool, sizeof(PRIVATE_CACHE_MAP), 'cPcC');
+        PrivateMap = ExAllocatePoolWithTag(NonPagedPool, sizeof(PRIVATE_CACHE_MAP), TAG_PRIVATE_CACHE_MAP);
         if (PrivateMap == NULL)
         {
             /* If we also allocated the shared cache map for this file, kill it */
diff --git a/ntoskrnl/include/internal/cc.h b/ntoskrnl/include/internal/cc.h
index 96792556971..63b6bc44f18 100644
--- a/ntoskrnl/include/internal/cc.h
+++ b/ntoskrnl/include/internal/cc.h
@@ -155,20 +155,24 @@ typedef struct _PFSN_PREFETCHER_GLOBALS
 
 typedef struct _ROS_SHARED_CACHE_MAP
 {
-    LIST_ENTRY CacheMapVacbListHead;
-    ULONG TimeStamp;
-    PFILE_OBJECT FileObject;
-    LARGE_INTEGER SectionSize;
+    CSHORT NodeTypeCode;
+    CSHORT NodeByteSize;
+    ULONG OpenCount;
     LARGE_INTEGER FileSize;
-    BOOLEAN PinAccess;
+    LARGE_INTEGER SectionSize;
+    PFILE_OBJECT FileObject;
+    ULONG DirtyPages;
+    LIST_ENTRY SharedCacheMapLinks;
     PCACHE_MANAGER_CALLBACKS Callbacks;
     PVOID LazyWriteContext;
     LIST_ENTRY PrivateList;
-    KSPIN_LOCK CacheMapLock;
-    ULONG OpenCount;
-    ULONG DirtyPages;
-    LIST_ENTRY SharedCacheMapLinks;
     ULONG DirtyPageThreshold;
+
+    /* ROS specific */
+    LIST_ENTRY CacheMapVacbListHead;
+    ULONG TimeStamp;
+    BOOLEAN PinAccess;
+    KSPIN_LOCK CacheMapLock;
 #if DBG
     BOOLEAN Trace; /* enable extra trace output for this cache map and it's VACBs */
 #endif
@@ -257,6 +261,7 @@ extern LAZY_WRITER LazyWriter;
 
 #define NODE_TYPE_DEFERRED_WRITE 0x02FC
 #define NODE_TYPE_PRIVATE_MAP    0x02FE
+#define NODE_TYPE_SHARED_MAP     0x02FF
 
 VOID
 NTAPI