drbd: consolidate explicit drbd_md_sync into drbd_create_new_uuid

Every code path changing the current UUID needs to get it on stable
storage anyways. Flush it to disk right there, remove the now obsolte
explicit drbd_md_sync statements in the other code paths.

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 8bfedc7..8d029b1 100644 (file)
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -1267,7 +1267,6 @@ static void after_state_ch(struct drbd_conf *mdev, union drbd_state os,
                        if (test_bit(NEW_CUR_UUID, &mdev->flags)) {
                                drbd_uuid_new_current(mdev);
                                clear_bit(NEW_CUR_UUID, &mdev->flags);
-                               drbd_md_sync(mdev);
                        }
                        spin_lock_irq(&mdev->req_lock);
                        _drbd_set_state(_NS(mdev, susp_fen, 0), CS_VERBOSE, NULL);
@@ -3659,6 +3658,8 @@ void drbd_uuid_new_current(struct drbd_conf *mdev) __must_hold(local)
 
        get_random_bytes(&val, sizeof(u64));
        _drbd_uuid_set(mdev, UI_CURRENT, val);
+       /* get it to stable storage _now_ */
+       drbd_md_sync(mdev);
 }
 
 void drbd_uuid_set_bm(struct drbd_conf *mdev, u64 val) __must_hold(local)

diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c
index 87925e9..c498c48 100644 (file)
--- a/drivers/block/drbd/drbd_nl.c
+++ b/drivers/block/drbd/drbd_nl.c
@@ -1953,7 +1953,6 @@ static int drbd_nl_resume_io(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp
        if (test_bit(NEW_CUR_UUID, &mdev->flags)) {
                drbd_uuid_new_current(mdev);
                clear_bit(NEW_CUR_UUID, &mdev->flags);
-               drbd_md_sync(mdev);
        }
        drbd_suspend_io(mdev);
        reply->ret_code = drbd_request_state(mdev, NS3(susp, 0, susp_nod, 0, susp_fen, 0));