On Tue, Aug 15, 2023 at 2:00 PM Yu Kuai [off-list ref] wrote:
[...]

quoted

+
+not_running:
+     clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
+     clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
+     clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
+     clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
+     clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
+     mddev_unlock(mddev);
+
+     wake_up(&resync_wait);
+     if (test_and_clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery) &&
+         mddev->sysfs_action)
+             sysfs_notify_dirent_safe(mddev->sysfs_action);
  }

  /*

@@ -9379,7 +9402,6 @@ void md_check_recovery(struct mddev *mddev)
              return;

      if (mddev_trylock(mddev)) {
-             int spares = 0;
              bool try_set_sync = mddev->safemode != 0;

              if (!mddev->external && mddev->safemode == 1)

@@ -9467,29 +9489,11 @@ void md_check_recovery(struct mddev *mddev)
              clear_bit(MD_RECOVERY_DONE, &mddev->recovery);

              if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
-                 test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
-                     goto not_running;
-             if (!md_choose_sync_direction(mddev, &spares))
-                     goto not_running;
-             if (mddev->pers->sync_request) {
-                     if (spares) {
-                             /* We are adding a device or devices to an array
-                              * which has the bitmap stored on all devices.
-                              * So make sure all bitmap pages get written
-                              */
-                             md_bitmap_write_all(mddev->bitmap);
-                     }
+                 test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {

Sorry that I made a mistake here while rebasing v2, here should be

!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)

With this fixed, there are no new regression for mdadm tests using loop
devicein my VM.

                if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
                    !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
                        queue_work(md_misc_wq, &mddev->sync_work);
                } else {

This doesn't look right. Should we do

                if (test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) &&
                    !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) {
                        queue_work(md_misc_wq, &mddev->sync_work);
                } else {

instead?

Thanks,
Song