diff -urN slinx-pristine/linux/drivers/md/md.c slinx-md/linux/drivers/md/md.c
--- slinx-pristine/linux/drivers/md/md.c        Sat Feb  3 18:58:15 2001
+++ slinx-md/linux/drivers/md/md.c      Sat Feb  3 19:00:59 2001
@@ -2710,6 +2710,10 @@
                        err = do_md_stop (mddev, 1);
                        goto done_unlock;
 
+               case BLKSETSIZE:
+                       set_blocksize (mddev, (int *) arg);
+                       goto done_unlock;
+
        /*
         * We have a problem here : there is no easy way to give a CHS
         * virtual geometry. We currently pretend that we have a 2 heads