--- ./source/private_module/mcachelayer/mcachelayer_v2/mcache_layer_extent.c	2018-02-09 13:47:03.000000000 +0000
+++ ./source/private_module/mcachelayer/mcachelayer_v2/mcache_layer_extent.c.hotpatch	2018-10-18 14:12:39.000000000 +0000
@@ -800,7 +800,7 @@
     {
         return RETURN_ERROR;
     }
-    
+    DBG_LogDebug(DBG_LOGID_NEW, "Start delete extent info(poolid %u volumeid 0x%llx, extentnum %u).", diskPoolId, volumeId, extentNum);
     atomic_set(&extentInfoContext->optFinishNum, 0);
     extentInfoContext->optResult = RETURN_OK;
     extentInfoContext->delOpType = OP_EXTENT_DEL_FOR_FREE_DATA_EXTENT;
@@ -1502,4 +1502,5 @@
     DELETE_MEMORY_PARTITION(g_extentInfoContextPartitionId);
     g_extentInfoContextPartitionId = INVALID_VALUE32;
 }
+EXPORT_SYMBOL(delExtentInfoFromMCacheForSpa);
 
