1 files changed, 9 insertions, 2 deletions

diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 22cfc6660b18..8e717bd518e7 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -2752,9 +2752,16 @@ static int raid1_resize(struct mddev *mddev, sector_t sectors)
          * any io in the removed space completes, but it hardly seems
          * worth it.
          */
-        md_set_array_sectors(mddev, raid1_size(mddev, sectors, 0));
-        if (mddev->array_sectors > raid1_size(mddev, sectors, 0))
+        sector_t newsize = raid1_size(mddev, sectors, 0);
+        if (mddev->external_size &&
+            mddev->array_sectors > newsize)
                 return -EINVAL;
+        if (mddev->bitmap) {
+                int ret = bitmap_resize(mddev->bitmap, newsize, 0, 0);
+                if (ret)
+                        return ret;
+        }
+        md_set_array_sectors(mddev, newsize);
         set_capacity(mddev->gendisk, mddev->array_sectors);
         revalidate_disk(mddev->gendisk);
         if (sectors > mddev->dev_sectors &&