LU-12491 obdclass: use RCU to release lu_env_item

[fs/lustre-release.git] / lustre / obdclass / lu_object.c

diff --git a/lustre/obdclass/lu_object.c b/lustre/obdclass/lu_object.c
index fbe034a..e308851 100644 (file)
--- a/lustre/obdclass/lu_object.c
+++ b/lustre/obdclass/lu_object.c
@@ -1886,6 +1886,7 @@ struct lu_env_item {
        struct task_struct *lei_task;   /* rhashtable key */
        struct rhash_head lei_linkage;
        struct lu_env *lei_env;
+       struct rcu_head lei_rcu_head;
 };
 
 static const struct rhashtable_params lu_env_rhash_params = {
@@ -1925,6 +1926,14 @@ int lu_env_add(struct lu_env *env)
 }
 EXPORT_SYMBOL(lu_env_add);
 
+static void lu_env_item_free(struct rcu_head *head)
+{
+       struct lu_env_item *lei;
+
+       lei = container_of(head, struct lu_env_item, lei_rcu_head);
+       OBD_FREE_PTR(lei);
+}
+
 void lu_env_remove(struct lu_env *env)
 {
        struct lu_env_item *lei;
@@ -1939,13 +1948,11 @@ void lu_env_remove(struct lu_env *env)
                }
        }
 
-       rcu_read_lock();
        lei = rhashtable_lookup_fast(&lu_env_rhash, &task,
                                     lu_env_rhash_params);
        if (lei && rhashtable_remove_fast(&lu_env_rhash, &lei->lei_linkage,
                                          lu_env_rhash_params) == 0)
-               OBD_FREE_PTR(lei);
-       rcu_read_unlock();
+               call_rcu(&lei->lei_rcu_head, lu_env_item_free);
 }
 EXPORT_SYMBOL(lu_env_remove);