[Patch v2 05/10] drbd: Functions to notify peer node to zero out

[Nick Wang]

Notify peer node to start zeroing out device.
Update state of peer node when both nodes are
finished zeroing.

Signed-off-by: Nick Wang <nwang@xxxxxxxx>
CC: Philipp Reisner <philipp.reisner@xxxxxxxxxx>
CC: Lars Ellenberg <lars.ellenberg@xxxxxxxxxx>
CC: drbd-dev@xxxxxxxxxxxxxxxx
CC: linux-kernel@xxxxxxxxxxxxxxx
---
 drbd/drbd_int.h  |  2 ++
 drbd/drbd_main.c | 19 +++++++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/drbd/drbd_int.h b/drbd/drbd_int.h
index 014b65e..f43f957 100644
--- a/drbd/drbd_int.h
+++ b/drbd/drbd_int.h
@@ -1208,6 +1208,8 @@ extern int __drbd_send_protocol(struct drbd_connection *connection, enum drbd_pa
 extern int drbd_send_protocol(struct drbd_connection *connection);
 extern int drbd_send_uuids(struct drbd_peer_device *);
 extern int drbd_send_uuids_skip_initial_sync(struct drbd_peer_device *);
+extern int drbd_send_zero_out_start(struct drbd_peer_device *);
+extern int drbd_send_zero_out_finish(struct drbd_peer_device *);
 extern int drbd_send_zero_out_ok(struct drbd_peer_device *);
 extern int drbd_send_zero_out_fail(struct drbd_peer_device *);
 extern void drbd_gen_and_send_sync_uuid(struct drbd_peer_device *);
diff --git a/drbd/drbd_main.c b/drbd/drbd_main.c
index 740015e..2b821cd 100644
--- a/drbd/drbd_main.c
+++ b/drbd/drbd_main.c
@@ -908,6 +908,25 @@ int drbd_send_uuids_skip_initial_sync(struct drbd_peer_device *peer_device)
 	return _drbd_send_uuids(peer_device, 8);
 }
 
+
+/**
+ * drbd_send_zero_out_start() - Notify peer node to start zero out
+ * @peer_device:	DRBD peer device.
+ */
+int drbd_send_zero_out_start(struct drbd_peer_device *peer_device)
+{
+	return _drbd_send_uuids(peer_device, 16);
+}
+
+/**
+ * drbd_send_zero_out_finish() - Notify both node finished zeroing out
+ * @peer_device:	DRBD peer device.
+ */
+int drbd_send_zero_out_finish(struct drbd_peer_device *peer_device)
+{
+	return _drbd_send_uuids(peer_device, 32);
+}
+
 /**
  * _drbd_send_zero_out_state() - Sends the drbd state to the peer
  * @peer_device:	DRBD peer device.
-- 
1.8.4.5

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