File storage link refreshing: log nr of documents to refresh.

pillar/api/file_storage/__init__.py

@@ -543,10 +543,17 @@ def refresh_links_for_backend(backend_name, chunk_size, expiry_seconds):
          }).sort([('link_expires', pymongo.ASCENDING)]).limit(
         chunk_size).batch_size(5)
 
-    if to_refresh.count() == 0:
+    document_count = to_refresh.count()
+    if document_count == 0:
         log.info('No links to refresh.')
         return
 
+    if 0 < chunk_size == document_count:
+        log.info('Found %d documents to refresh, probably limited by the chunk size.',
+                 document_count)
+    else:
+        log.info('Found %d documents to refresh.', document_count)
+
     refreshed = 0
     for file_doc in to_refresh:
         try: