diff --git a/block/mirror.c b/block/mirror.c
index 11d4d66f43..454365ce00 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -1488,15 +1488,6 @@ static void bdrv_mirror_top_child_perm(BlockDriverState *bs, BdrvChild *c,
     *nshared = BLK_PERM_ALL;
 }
 
-static void bdrv_mirror_top_refresh_limits(BlockDriverState *bs, Error **errp)
-{
-    MirrorBDSOpaque *s = bs->opaque;
-
-    if (s && s->job && s->job->copy_mode == MIRROR_COPY_MODE_WRITE_BLOCKING) {
-        bs->bl.request_alignment = s->job->granularity;
-    }
-}
-
 /* Dummy node that provides consistent read to its users without requiring it
  * from its backing file and that allows writes on the backing file chain. */
 static BlockDriver bdrv_mirror_top = {
@@ -1509,7 +1500,6 @@ static BlockDriver bdrv_mirror_top = {
     .bdrv_co_block_status       = bdrv_co_block_status_from_backing,
     .bdrv_refresh_filename      = bdrv_mirror_top_refresh_filename,
     .bdrv_child_perm            = bdrv_mirror_top_child_perm,
-    .bdrv_refresh_limits        = bdrv_mirror_top_refresh_limits,
 };
 
 static BlockJob *mirror_start_job(
@@ -1657,25 +1647,6 @@ static BlockJob *mirror_start_job(
         s->should_complete = true;
     }
 
-    /*
-     * Must be called before we start tracking writes, but after
-     *
-     *     ((MirrorBlockJob *)
-     *         ((MirrorBDSOpaque *)
-     *             mirror_top_bs->opaque
-     *         )->job
-     *     )->copy_mode
-     *
-     * has the correct value.
-     * (We start tracking writes as of the following
-     * bdrv_create_dirty_bitmap() call.)
-     */
-    bdrv_refresh_limits(mirror_top_bs, &local_err);
-    if (local_err) {
-        error_propagate(errp, local_err);
-        goto fail;
-    }
-
     s->dirty_bitmap = bdrv_create_dirty_bitmap(bs, granularity, NULL, errp);
     if (!s->dirty_bitmap) {
         goto fail;