md-cluster/raid10: call update_size in md_reap_sync_thread

We need to change the capacity in all nodes after one node
finishs reshape. And as we did before, we can't change the
capacity directly in md_do_sync, instead, the capacity should
be only changed in update_size or received CHANGE_CAPACITY
msg.

So master node calls update_size after completes reshape in
md_reap_sync_thread, but we need to skip ops->update_size if
MD_CLOSING is set since reshaping could not be finish.

Reviewed-by: NeilBrown <neilb@suse.com>
Signed-off-by: Guoqing Jiang <gqjiang@suse.com>
Signed-off-by: Shaohua Li <shli@fb.com>

1 files changed, 18 insertions, 3 deletions

diff --git a/drivers/md/md.c b/drivers/md/md.c
index e07096c4ff20..e28f5db0a882 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -8623,8 +8623,10 @@ void md_do_sync(struct md_thread *thread)
                 mddev_lock_nointr(mddev);
                 md_set_array_sectors(mddev, mddev->pers->size(mddev, 0, 0));
                 mddev_unlock(mddev);
-                set_capacity(mddev->gendisk, mddev->array_sectors);
-                revalidate_disk(mddev->gendisk);
+                if (!mddev_is_clustered(mddev)) {
+                        set_capacity(mddev->gendisk, mddev->array_sectors);
+                        revalidate_disk(mddev->gendisk);
+                }
         }
 
         spin_lock(&mddev->lock);
@@ -8968,6 +8970,8 @@ EXPORT_SYMBOL(md_check_recovery);
 void md_reap_sync_thread(struct mddev *mddev)
 {
         struct md_rdev *rdev;
+        sector_t old_dev_sectors = mddev->dev_sectors;
+        bool is_reshaped = false;
 
         /* resync has finished, collect result */
         md_unregister_thread(&mddev->sync_thread);
@@ -8982,8 +8986,11 @@ void md_reap_sync_thread(struct mddev *mddev)
                 }
         }
         if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
-            mddev->pers->finish_reshape)
+            mddev->pers->finish_reshape) {
                 mddev->pers->finish_reshape(mddev);
+                if (mddev_is_clustered(mddev))
+                        is_reshaped = true;
+        }
 
         /* If array is no-longer degraded, then any saved_raid_disk
          * information must be scrapped.
@@ -9004,6 +9011,14 @@ void md_reap_sync_thread(struct mddev *mddev)
         clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
         clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
         clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
+        /*
+         * We call md_cluster_ops->update_size here because sync_size could
+         * be changed by md_update_sb, and MD_RECOVERY_RESHAPE is cleared,
+         * so it is time to update size across cluster.
+         */
+        if (mddev_is_clustered(mddev) && is_reshaped
+                                      && !test_bit(MD_CLOSING, &mddev->flags))
+                md_cluster_ops->update_size(mddev, old_dev_sectors);
         wake_up(&resync_wait);
         /* flag recovery needed just to double check */
         set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);