1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/md/raid10.h b/drivers/md/raid10.h
index 1054cf602345..157d69e83ff4 100644
--- a/drivers/md/raid10.h
+++ b/drivers/md/raid10.h
@@ -33,6 +33,11 @@ struct r10conf {
                                                * far_offset, in which case it is
                                                * 1 stripe.
                                                */
+                int             far_set_size; /* The number of devices in a set,
+                                               * where a 'set' are devices that
+                                               * contain far/offset copies of
+                                               * each other.
+                                               */
                 int             chunk_shift; /* shift from chunks to sectors */
                 sector_t        chunk_mask;
         } prev, geo;