3 files changed, 13 insertions, 2 deletions

diff --git a/fs/fscache/internal.h b/fs/fscache/internal.h
index 5b49a373689b..0ca2566e038c 100644
--- a/fs/fscache/internal.h
+++ b/fs/fscache/internal.h
@@ -215,6 +215,7 @@ extern atomic_t fscache_n_object_no_alloc;
 extern atomic_t fscache_n_object_lookups;
 extern atomic_t fscache_n_object_lookups_negative;
 extern atomic_t fscache_n_object_lookups_positive;
+extern atomic_t fscache_n_object_lookups_timed_out;
 extern atomic_t fscache_n_object_created;
 extern atomic_t fscache_n_object_avail;
 extern atomic_t fscache_n_object_dead;
diff --git a/fs/fscache/object.c b/fs/fscache/object.c
index f3f952cf887e..e513ac599c8e 100644
--- a/fs/fscache/object.c
+++ b/fs/fscache/object.c
@@ -468,6 +468,7 @@ static void fscache_lookup_object(struct fscache_object *object)
 {
         struct fscache_cookie *cookie = object->cookie;
         struct fscache_object *parent;
+        int ret;
 
         _enter("");
 
@@ -493,12 +494,19 @@ static void fscache_lookup_object(struct fscache_object *object)
 
         fscache_stat(&fscache_n_object_lookups);
         fscache_stat(&fscache_n_cop_lookup_object);
-        object->cache->ops->lookup_object(object);
+        ret = object->cache->ops->lookup_object(object);
         fscache_stat_d(&fscache_n_cop_lookup_object);
 
         if (test_bit(FSCACHE_OBJECT_EV_ERROR, &object->events))
                 set_bit(FSCACHE_COOKIE_UNAVAILABLE, &cookie->flags);
 
+        if (ret == -ETIMEDOUT) {
+                /* probably stuck behind another object, so move this one to
+                 * the back of the queue */
+                fscache_stat(&fscache_n_object_lookups_timed_out);
+                set_bit(FSCACHE_OBJECT_EV_REQUEUE, &object->events);
+        }
+
         _leave("");
 }
 
diff --git a/fs/fscache/stats.c b/fs/fscache/stats.c
index 05f77caf4a2d..46435f3aae68 100644
--- a/fs/fscache/stats.c
+++ b/fs/fscache/stats.c
@@ -98,6 +98,7 @@ atomic_t fscache_n_object_no_alloc;
 atomic_t fscache_n_object_lookups;
 atomic_t fscache_n_object_lookups_negative;
 atomic_t fscache_n_object_lookups_positive;
+atomic_t fscache_n_object_lookups_timed_out;
 atomic_t fscache_n_object_created;
 atomic_t fscache_n_object_avail;
 atomic_t fscache_n_object_dead;
@@ -160,10 +161,11 @@ static int fscache_stats_show(struct seq_file *m, void *v)
                    atomic_read(&fscache_n_acquires_nobufs),
                    atomic_read(&fscache_n_acquires_oom));
 
-        seq_printf(m, "Lookups: n=%u neg=%u pos=%u crt=%u\n",
+        seq_printf(m, "Lookups: n=%u neg=%u pos=%u crt=%u tmo=%u\n",
                    atomic_read(&fscache_n_object_lookups),
                    atomic_read(&fscache_n_object_lookups_negative),
                    atomic_read(&fscache_n_object_lookups_positive),
+                   atomic_read(&fscache_n_object_lookups_timed_out),
                    atomic_read(&fscache_n_object_created));
 
         seq_printf(m, "Updates: n=%u nul=%u run=%u\n",