2 files changed, 27 insertions, 0 deletions

diff --git a/Documentation/filesystems/caching/backend-api.txt b/Documentation/filesystems/caching/backend-api.txt
index 277d1e810670..c0bd5677271b 100644
--- a/Documentation/filesystems/caching/backend-api.txt
+++ b/Documentation/filesystems/caching/backend-api.txt
@@ -676,6 +676,29 @@ FS-Cache provides some utilities that a cache backend may make use of:
      as possible.
 
 
+ (*) Indicate that a stale object was found and discarded:
+
+        void fscache_object_retrying_stale(struct fscache_object *object);
+
+     This is called to indicate that the lookup procedure found an object in
+     the cache that the netfs decided was stale.  The object has been
+     discarded from the cache and the lookup will be performed again.
+
+
+ (*) Indicate that the caching backend killed an object:
+
+        void fscache_object_mark_killed(struct fscache_object *object,
+                                        enum fscache_why_object_killed why);
+
+     This is called to indicate that the cache backend preemptively killed an
+     object.  The why parameter should be set to indicate the reason:
+
+        FSCACHE_OBJECT_IS_STALE - the object was stale and needs discarding.
+        FSCACHE_OBJECT_NO_SPACE - there was insufficient cache space
+        FSCACHE_OBJECT_WAS_RETIRED - the object was retired when relinquished.
+        FSCACHE_OBJECT_WAS_CULLED - the object was culled to make space.
+
+
  (*) Get and release references on a retrieval record:
 
         void fscache_get_retrieval(struct fscache_retrieval *op);
diff --git a/Documentation/filesystems/caching/fscache.txt b/Documentation/filesystems/caching/fscache.txt
index 770267af5b3e..66fa7fbccfa4 100644
--- a/Documentation/filesystems/caching/fscache.txt
+++ b/Documentation/filesystems/caching/fscache.txt
@@ -303,6 +303,10 @@ proc files.
                 wrp=N   Number of in-progress write_page() cache ops
                 ucp=N   Number of in-progress uncache_page() cache ops
                 dsp=N   Number of in-progress dissociate_pages() cache ops
+        CacheEv nsp=N   Number of object lookups/creations rejected due to lack of space
+                stl=N   Number of stale objects deleted
+                rtr=N   Number of objects retired when relinquished
+                cul=N   Number of objects culled
 
 
  (*) /proc/fs/fscache/histogram