drbd: don't pretend that barrier_nr == 0 was special

We used to have a barrier implementation where barrier_nr 0 was
reserved. That is long gone. Just use the full sequence space.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>

diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index 02fd1e1..519f286 100644 (file)
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -247,9 +247,7 @@ void _tl_add_barrier(struct drbd_conf *mdev, struct drbd_tl_epoch *new)
        new->n_writes = 0;
 
        newest_before = mdev->newest_tle;
-       /* never send a barrier number == 0, because that is special-cased
-        * when using TCQ for our write ordering code */
-       new->br_number = (newest_before->br_number+1) ?: 1;
+       new->br_number = newest_before->br_number+1;
        if (mdev->newest_tle != new) {
                mdev->newest_tle->next = new;
                mdev->newest_tle = new;