1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/md/raid5.h b/drivers/md/raid5.h
index 8d8e13934a48..c6bdfa01d987 100644
--- a/drivers/md/raid5.h
+++ b/drivers/md/raid5.h
@@ -385,6 +385,12 @@ struct r5conf {
         short                   generation; /* increments with every reshape */
         unsigned long           reshape_checkpoint; /* Time we last updated
                                                      * metadata */
+        long long               min_offset_diff; /* minimum difference between
+                                                  * data_offset and
+                                                  * new_data_offset across all
+                                                  * devices.  May be negative,
+                                                  * but is closest to zero.
+                                                  */
 
         struct list_head        handle_list; /* stripes needing handling */
         struct list_head        hold_list; /* preread ready stripes */