drbd: Revert "drbd: Create new current UUID as late as possible"

The late-UUID writing is delayed until the next release.

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

drivers/block/drbd/drbd_int.h

@@ -943,8 +943,7 @@ struct drbd_conf {
 	struct drbd_work  resync_work,
 			  unplug_work,
 			  md_sync_work,
-			  delay_probe_work,
-			  uuid_work;
+			  delay_probe_work;
 	struct timer_list resync_timer;
 	struct timer_list md_sync_timer;
 	struct timer_list delay_probe_timer;
@@ -1069,7 +1068,6 @@ struct drbd_conf {
 	struct timeval dps_time; /* delay-probes-start-time */
 	unsigned int dp_volume_last;  /* send_cnt of last delay probe */
 	int c_sync_rate; /* current resync rate after delay_probe magic */
-	atomic_t new_c_uuid;
 };
 
 static inline struct drbd_conf *minor_to_mdev(unsigned int minor)
@@ -2219,8 +2217,6 @@ static inline int __inc_ap_bio_cond(struct drbd_conf *mdev)
 		return 0;
 	if (test_bit(BITMAP_IO, &mdev->flags))
 		return 0;
-	if (atomic_read(&mdev->new_c_uuid))
-		return 0;
 	return 1;
 }
 
@@ -2241,9 +2237,6 @@ static inline void inc_ap_bio(struct drbd_conf *mdev, int count)
 	 * to avoid races with the reconnect code,
 	 * we need to atomic_inc within the spinlock. */
 
-	if (atomic_read(&mdev->new_c_uuid) && atomic_add_unless(&mdev->new_c_uuid, -1, 1))
-		drbd_queue_work_front(&mdev->data.work, &mdev->uuid_work);
-
 	spin_lock_irq(&mdev->req_lock);
 	while (!__inc_ap_bio_cond(mdev)) {
 		prepare_to_wait(&mdev->misc_wait, &wait, TASK_UNINTERRUPTIBLE);

drivers/block/drbd/drbd_main.c

@@ -1215,18 +1215,17 @@ static void after_state_ch(struct drbd_conf *mdev, union drbd_state os,
 	     ns.pdsk == D_OUTDATED)) {
 		if (get_ldev(mdev)) {
 			if ((ns.role == R_PRIMARY || ns.peer == R_PRIMARY) &&
-			    mdev->ldev->md.uuid[UI_BITMAP] == 0 && ns.disk >= D_UP_TO_DATE &&
-			    !atomic_read(&mdev->new_c_uuid))
-				atomic_set(&mdev->new_c_uuid, 2);
+			    mdev->ldev->md.uuid[UI_BITMAP] == 0 && ns.disk >= D_UP_TO_DATE) {
+				drbd_uuid_new_current(mdev);
+				drbd_send_uuids(mdev);
+			}
 			put_ldev(mdev);
 		}
 	}
 
 	if (ns.pdsk < D_INCONSISTENT && get_ldev(mdev)) {
-		/* Diskless peer becomes primary or got connected do diskless, primary peer. */
-		if (ns.peer == R_PRIMARY && mdev->ldev->md.uuid[UI_BITMAP] == 0 &&
-		    !atomic_read(&mdev->new_c_uuid))
-			atomic_set(&mdev->new_c_uuid, 2);
+		if (ns.peer == R_PRIMARY && mdev->ldev->md.uuid[UI_BITMAP] == 0)
+			drbd_uuid_new_current(mdev);
 
 		/* D_DISKLESS Peer becomes secondary */
 		if (os.peer == R_PRIMARY && ns.peer == R_SECONDARY)
@@ -1350,24 +1349,6 @@ static void after_state_ch(struct drbd_conf *mdev, union drbd_state os,
 	drbd_md_sync(mdev);
 }
 
-static int w_new_current_uuid(struct drbd_conf *mdev, struct drbd_work *w, int cancel)
-{
-	if (get_ldev(mdev)) {
-		if (mdev->ldev->md.uuid[UI_BITMAP] == 0) {
-			drbd_uuid_new_current(mdev);
-			if (get_net_conf(mdev)) {
-				drbd_send_uuids(mdev);
-				put_net_conf(mdev);
-			}
-			drbd_md_sync(mdev);
-		}
-		put_ldev(mdev);
-	}
-	atomic_dec(&mdev->new_c_uuid);
-	wake_up(&mdev->misc_wait);
-
-	return 1;
-}
 
 static int drbd_thread_setup(void *arg)
 {
@@ -2708,7 +2689,6 @@ void drbd_init_set_defaults(struct drbd_conf *mdev)
 	atomic_set(&mdev->net_cnt, 0);
 	atomic_set(&mdev->packet_seq, 0);
 	atomic_set(&mdev->pp_in_use, 0);
-	atomic_set(&mdev->new_c_uuid, 0);
 
 	mutex_init(&mdev->md_io_mutex);
 	mutex_init(&mdev->data.mutex);
@@ -2739,14 +2719,12 @@ void drbd_init_set_defaults(struct drbd_conf *mdev)
 	INIT_LIST_HEAD(&mdev->bm_io_work.w.list);
 	INIT_LIST_HEAD(&mdev->delay_probes);
 	INIT_LIST_HEAD(&mdev->delay_probe_work.list);
-	INIT_LIST_HEAD(&mdev->uuid_work.list);
 
 	mdev->resync_work.cb  = w_resync_inactive;
 	mdev->unplug_work.cb  = w_send_write_hint;
 	mdev->md_sync_work.cb = w_md_sync;
 	mdev->bm_io_work.w.cb = w_bitmap_io;
 	mdev->delay_probe_work.cb = w_delay_probes;
-	mdev->uuid_work.cb = w_new_current_uuid;
 	init_timer(&mdev->resync_timer);
 	init_timer(&mdev->md_sync_timer);
 	init_timer(&mdev->delay_probe_timer);

drivers/block/drbd/drbd_receiver.c

@@ -1154,17 +1154,6 @@ int drbd_submit_ee(struct drbd_conf *mdev, struct drbd_epoch_entry *e,
 	unsigned n_bios = 0;
 	unsigned nr_pages = (ds + PAGE_SIZE -1) >> PAGE_SHIFT;
 
-	if (atomic_read(&mdev->new_c_uuid)) {
-		if (atomic_add_unless(&mdev->new_c_uuid, -1, 1)) {
-			drbd_uuid_new_current(mdev);
-			drbd_md_sync(mdev);
-
-			atomic_dec(&mdev->new_c_uuid);
-			wake_up(&mdev->misc_wait);
-		}
-		wait_event(mdev->misc_wait, !atomic_read(&mdev->new_c_uuid));
-	}
-
 	/* In most cases, we will only need one bio.  But in case the lower
 	 * level restrictions happen to be different at this offset on this
 	 * side than those of the sending peer, we may need to submit the