md: adjust resync_min usefully when resync aborts.

When a 'check' or 'repair' finished we should clear resync_min
so that a future check/repair will cover the whole array (by default).
However if it is interrupted, we should update resync_min to
where we got up to, so that when the check/repair continues it
just does the remainder of the array.

Signed-off-by: NeilBrown <neilb@suse.de>

1 files changed, 7 insertions, 3 deletions

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 1be7a16a7a53..a08aa582925b 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -6524,11 +6524,15 @@ void md_do_sync(mddev_t *mddev)
         set_bit(MD_CHANGE_DEVS, &mddev->flags);
 
  skip:
+        if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
+                /* We completed so min/max setting can be forgotten if used. */
+                if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
+                        mddev->resync_min = 0;
+                mddev->resync_max = MaxSector;
+        } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
+                mddev->resync_min = mddev->curr_resync_completed;
         mddev->curr_resync = 0;
         mddev->curr_resync_completed = 0;
-        if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
-                /* We completed so max setting can be forgotten. */
-                mddev->resync_max = MaxSector;
         sysfs_notify(&mddev->kobj, NULL, "sync_completed");
         wake_up(&resync_wait);
         set_bit(MD_RECOVERY_DONE, &mddev->recovery);