1 files changed, 2 insertions, 0 deletions

diff --git a/include/linux/journal-head.h b/include/linux/journal-head.h
index 423cb6d78ee0..c18b46f8aeeb 100644
--- a/include/linux/journal-head.h
+++ b/include/linux/journal-head.h
@@ -66,6 +66,8 @@ struct journal_head {
          * transaction (if there is one).  Only applies to buffers on a
          * transaction's data or metadata journaling list.
          * [j_list_lock] [jbd_lock_bh_state()]
+         * Either of these locks is enough for reading, both are needed for
+         * changes.
          */
         transaction_t *b_transaction;