kv: reset 'm_total_bytes' when reloading.

Signed-off-by: Haodong Tang <haodong.tang@intel.com>

src/kv/MemDB.cc

@@ -114,18 +114,20 @@ int MemDB::_load()
   }
 
   ssize_t file_size = st.st_size;
-  ssize_t bytes_done = 0;
-  while (bytes_done < file_size) {
+  ssize_t bytes_key_done = 0;
+  ssize_t bytes_data_done = 0;
+  while ((bytes_key_done + bytes_data_done) < file_size) {
     string key;
     bufferptr datap;
 
-    bytes_done += ::decode_file(fd, key);
-    bytes_done += ::decode_file(fd, datap);
+    bytes_key_done += ::decode_file(fd, key);
+    bytes_data_done += ::decode_file(fd, datap);
 
     dout(10) << __func__ << " Key:"<< key << dendl;
     m_btree[key] = datap;
     m_total_bytes += datap.length();
   }
+  m_total_bytes = bytes_data_done;
   VOID_TEMP_FAILURE_RETRY(::close(fd));
   return 0;
 }