diff --git a/NTOSKRNL/CC/ccloghandler.cpp b/NTOSKRNL/CC/ccloghandler.cpp
index 975b641..5af923e 100644
--- a/NTOSKRNL/CC/ccloghandler.cpp
+++ b/NTOSKRNL/CC/ccloghandler.cpp
@@ -58,7 +58,8 @@ CcGetDirtyPages(IN PVOID LogHandle,
             FileObject = CcReferenceSharedCacheMapFileObject(SharedCacheMap);
 
             /* Acquire the BCB Lock */
-             oldIrql = ExAcquireSpinLockShared (&SharedCacheMap->BcbSpinLock);
+             KLOCK_QUEUE_HANDLE LockHandle;
+             KeAcquireInStackQueuedSpinLock(&SharedCacheMap->BcbLock, &LockHandle);
 
             /* Iterate over BCB List */
 			      for (auto it = ListEntryIterator::begin(&SharedCacheMap->BcbList); it != ListEntryIterator::end(&SharedCacheMap->BcbList); ++it)
@@ -75,7 +76,7 @@ CcGetDirtyPages(IN PVOID LogHandle,
                     Bcb->PinCount++;
 
                     /*Release the BCB lock temporarily for the callback*/
-                    ExReleaseSpinLockShared (&SharedCacheMap->BcbSpinLock,oldIrql);
+                    KeReleaseInStackQueuedSpinLock(&LockHandle);
 
                     /*Unpin any previously pinned BCB*/
                     if (BcbToUnpin) 
@@ -99,7 +100,7 @@ CcGetDirtyPages(IN PVOID LogHandle,
                }
 
                     // Reacquire the BCB lock
-                    oldIrql = ExAcquireSpinLockShared (&SharedCacheMap->BcbSpinLock);
+                    KeAcquireInStackQueuedSpinLock(&SharedCacheMap->BcbLock, &LockHandle);
                     // Decrement the PinCount or mark for unpinning
                     if (Bcb->PinCount > 1)
                      {
@@ -114,7 +115,7 @@ CcGetDirtyPages(IN PVOID LogHandle,
             }
 
             /*Release the BCB lock*/ 
-            ExReleaseSpinLockShared (&SharedCacheMap->BcbSpinLock,oldIrql);
+            KeReleaseInStackQueuedSpinLock(&LockHandle);
 			
             /* Dereference the shared cache map file object*/
             CcDereferenceSharedCacheMapFileObject(SharedCacheMap, FileObject);
@@ -143,7 +144,57 @@ NTAPI
 CcGetLsnForFileObject(IN PFILE_OBJECT FileObject,
                       OUT OPTIONAL PLARGE_INTEGER OldestLsn)
 {    
-     /* IMPLEMENTATION INCOMPLETE*/
+    PSHARED_CACHE_MAP SharedCacheMap = nullptr;
+    PMBCB Bcb = nullptr;
+    KLOCK_QUEUE_HANDLE LockHandle;
+    LARGE_INTEGER OldestLsnValue = {0};
+	LARGE_INTEGER Result  = {0};
+	BITMAP_RANGE  OldRangeBasePage = {0};
+
+    if (OldestLsn) 
+	{
+        OldestLsn->QuadPart = 0;
+    }
+    SharedCacheMap = FileObject->SectionObjectPointer->SharedCacheMap;
+    if (!SharedCacheMap || !SharedCacheMap->BcbList.Flink) {
+        return 0;
+    }
+
+    /* Acquire the spin lock*/
+    KeAcquireInStackQueuedSpinLock(&SharedCacheMap->BcbLock, &LockHandle);
+	for(auto it = ListEntryIterator::begin(&SharedCacheMap->BcbList); it != ListEntryIterator::end(&SharedCacheMap->BcbList); ++it) 
+	{
+        Bcb = CONTAINING_RECORD(*it, _MBCB, BitmapRange1);
+
+        if (Bcb->NodeTypeCode == NODE_TYPE_CODE_BCB && Bcb->NodeIsInZone) 
+		{
+            auto MostRecentlyDirtiedPage = Bcb->MostRecentlyDirtiedPage.QuadPart;
+
+            if (MostRecentlyDirtiedPage && (!OldestLsnValue.QuadPart || MostRecentlyDirtiedPage < OldestLsnValue.QuadPart)) 
+			{
+                OldestLsnValue = MostRecentlyDirtiedPage;
+            }
+			
+			if(Bcb->BitmapRange1.BasePage > OldRangeBasePage.BasePage)
+			{
+			    OldRangeBasePage = Bcb->BitmapRange1;
+			}
+         }
+        }
+    }
+
+    
+    KeReleaseInStackQueuedSpinLock(&LockHandle);
+
+    /* Set the OldestLsn value if requested*/
+    if (OldestLsn) 
+	{
+        OldestLsn->QuadPart = OldestLsnValue;
+    }
+    
+     Result.QuadPart = OldRangeBasePage.BasePage;
+	
+	return Result;
 }