X-Git-Url: https://git.arvados.org/arvados.git/blobdiff_plain/408cbfd4f3737ef5bfbf908d96ac9c469fcf6cdd..b17f04b7797eda5a5d888264f7d480d762a9966f:/services/fuse/arvados_fuse/fresh.py

diff --git a/services/fuse/arvados_fuse/fresh.py b/services/fuse/arvados_fuse/fresh.py
index a51dd909b6..2a3a19c54c 100644
--- a/services/fuse/arvados_fuse/fresh.py
+++ b/services/fuse/arvados_fuse/fresh.py
@@ -59,6 +59,10 @@ class FreshBase(object):
     * Clear the object contents (invalidates the object)
 
     """
+
+    __slots__ = ("_stale", "_poll", "_last_update", "_atime", "_poll_time", "use_count",
+                 "ref_count", "dead", "cache_size", "cache_uuid", "allow_attr_cache")
+
     def __init__(self):
         self._stale = True
         self._poll = False
@@ -70,8 +74,9 @@ class FreshBase(object):
         self.dead = False
         self.cache_size = 0
         self.cache_uuid = None
+
+        # Can the kernel cache attributes?
         self.allow_attr_cache = True
-        self.allow_dirent_cache = True
 
     def invalidate(self):
         """Indicate that object contents should be refreshed from source."""
@@ -142,3 +147,13 @@ class FreshBase(object):
 
     def child_event(self, ev):
         pass
+
+    def time_to_next_poll(self):
+        if self._poll:
+            t = (self._last_update + self._poll_time) - self._atime
+            if t < 0:
+                return 0
+            else:
+                return t
+        else:
+            return self._poll_time