1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/md/md.h b/drivers/md/md.h
index 653f992b687a..20f02c0b5f2d 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -268,6 +268,14 @@ struct mddev {
 
         struct md_thread                *thread;        /* management thread */
         struct md_thread                *sync_thread;   /* doing resync or reconstruct */
+
+        /* 'last_sync_action' is initialized to "none".  It is set when a
+         * sync operation (i.e "data-check", "requested-resync", "resync",
+         * "recovery", or "reshape") is started.  It holds this value even
+         * when the sync thread is "frozen" (interrupted) or "idle" (stopped
+         * or finished).  It is overwritten when a new sync operation is begun.
+         */
+        char                            *last_sync_action;
         sector_t                        curr_resync;    /* last block scheduled */
         /* As resync requests can complete out of order, we cannot easily track
          * how much resync has been completed.  So we occasionally pause until