[Patch v2 04/10] drbd: New packet P_ZERO_OUT

[Nick Wang]

Using packet P_ZERO_OUT to get peer node's result
of zeroing out.

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      |  5 +++++
 drbd/drbd_main.c     | 28 ++++++++++++++++++++++++++++
 drbd/drbd_protocol.h |  1 +
 3 files changed, 34 insertions(+)

diff --git a/drbd/drbd_int.h b/drbd/drbd_int.h
index 9ecf971..014b65e 100644
--- a/drbd/drbd_int.h
+++ b/drbd/drbd_int.h
@@ -622,6 +622,9 @@ enum {
 	RS_START,		/* tell worker to start resync/OV */
 	RS_PROGRESS,		/* tell worker that resync made significant progress */
 	RS_DONE,		/* tell worker that resync is done */
+	/* used for zero out device */
+	ZERO_DONE,		/* succeed on zero out a device */
+	ZERO_FAIL,		/* fail to zero out a device */
 };
 
 struct drbd_bitmap; /* opaque for drbd_device */
@@ -1205,6 +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_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 *);
 extern int drbd_send_sizes(struct drbd_peer_device *peer_device, int trigger_reply, enum dds_flags flags);
 extern int drbd_send_state(struct drbd_peer_device *, union drbd_state);
diff --git a/drbd/drbd_main.c b/drbd/drbd_main.c
index a3dc39e..740015e 100644
--- a/drbd/drbd_main.c
+++ b/drbd/drbd_main.c
@@ -908,6 +908,34 @@ int drbd_send_uuids_skip_initial_sync(struct drbd_peer_device *peer_device)
 	return _drbd_send_uuids(peer_device, 8);
 }
 
+/**
+ * _drbd_send_zero_out_state() - Sends the drbd state to the peer
+ * @peer_device:	DRBD peer device.
+ * @state:	Device zero out status.
+ */
+static int _drbd_send_zero_out_state(struct drbd_peer_device *peer_device, unsigned int status)
+{
+	struct drbd_socket *sock;
+	struct p_state *p;
+
+	sock = &peer_device->connection->data;
+	p = drbd_prepare_command(peer_device, sock);
+	if (!p)
+		return -EIO;
+	p->state = cpu_to_be32(status);
+	return drbd_send_command(peer_device, sock, P_ZERO_OUT, sizeof(*p), NULL, 0);
+}
+
+int drbd_send_zero_out_ok(struct drbd_peer_device *peer_device)
+{
+	return _drbd_send_zero_out_state(peer_device, 0);
+}
+
+int drbd_send_zero_out_fail(struct drbd_peer_device *peer_device)
+{
+	return _drbd_send_zero_out_state(peer_device, 1);
+}
+
 void drbd_print_uuids(struct drbd_device *device, const char *text)
 {
 	if (get_ldev_if_state(device, D_NEGOTIATING)) {
diff --git a/drbd/drbd_protocol.h b/drbd/drbd_protocol.h
index 405b181..3a82442 100644
--- a/drbd/drbd_protocol.h
+++ b/drbd/drbd_protocol.h
@@ -59,6 +59,7 @@ enum drbd_packet {
 	/* REQ_DISCARD. We used "discard" in different contexts before,
 	 * which is why I chose TRIM here, to disambiguate. */
 	P_TRIM                = 0x31,
+	P_ZERO_OUT            = 0x32,
 
 	P_MAY_IGNORE	      = 0x100, /* Flag to test if (cmd > P_MAY_IGNORE) ... */
 	P_MAX_OPT_CMD	      = 0x101,
-- 
1.8.4.5

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