1 files changed, 6 insertions, 1 deletions

diff --git a/fs/nilfs2/the_nilfs.h b/fs/nilfs2/the_nilfs.h
index be4c040fd629..d0cf4fb7c9ce 100644
--- a/fs/nilfs2/the_nilfs.h
+++ b/fs/nilfs2/the_nilfs.h
@@ -48,6 +48,7 @@ enum {
  * @ns_bdi: backing dev info
  * @ns_writer: back pointer to writable nilfs_sb_info
  * @ns_sem: semaphore for shared states
+ * @ns_super_sem: semaphore for global operations across super block instances
  * @ns_writer_mutex: mutex protecting ns_writer attach/detach
  * @ns_writer_refcount: number of referrers on ns_writer
  * @ns_current: back pointer to current mount
@@ -96,10 +97,15 @@ struct the_nilfs {
         struct backing_dev_info *ns_bdi;
         struct nilfs_sb_info   *ns_writer;
         struct rw_semaphore     ns_sem;
+        struct rw_semaphore     ns_super_sem;
         struct mutex            ns_writer_mutex;
         atomic_t                ns_writer_refcount;
 
+        /*
+         * components protected by ns_super_sem
+         */
         struct nilfs_sb_info   *ns_current;
+        struct list_head        ns_supers;
 
         /*
          * used for
@@ -113,7 +119,6 @@ struct the_nilfs {
         time_t                  ns_sbwtime[2];
         unsigned                ns_sbsize;
         unsigned                ns_mount_state;
-        struct list_head        ns_supers;
 
         /*
          * Following fields are dedicated to a writable FS-instance.