fs: scale files_lock
[linux-2.6.git] / fs / super.c
index 9674ab2..8819e3a 100644 (file)
@@ -54,7 +54,22 @@ static struct super_block *alloc_super(struct file_system_type *type)
                        s = NULL;
                        goto out;
                }
+#ifdef CONFIG_SMP
+               s->s_files = alloc_percpu(struct list_head);
+               if (!s->s_files) {
+                       security_sb_free(s);
+                       kfree(s);
+                       s = NULL;
+                       goto out;
+               } else {
+                       int i;
+
+                       for_each_possible_cpu(i)
+                               INIT_LIST_HEAD(per_cpu_ptr(s->s_files, i));
+               }
+#else
                INIT_LIST_HEAD(&s->s_files);
+#endif
                INIT_LIST_HEAD(&s->s_instances);
                INIT_HLIST_HEAD(&s->s_anon);
                INIT_LIST_HEAD(&s->s_inodes);
@@ -108,6 +123,9 @@ out:
  */
 static inline void destroy_super(struct super_block *s)
 {
+#ifdef CONFIG_SMP
+       free_percpu(s->s_files);
+#endif
        security_sb_free(s);
        kfree(s->s_subtype);
        kfree(s->s_options);