drbd: implemented receiving of P_CONN_ST_CHG_REQ

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

drivers/block/drbd/drbd_int.h

@@ -1219,6 +1219,7 @@ extern int drbd_send_ov_request(struct drbd_conf *mdev,sector_t sector,int size)
 extern int drbd_send_bitmap(struct drbd_conf *mdev);
 extern int _drbd_send_bitmap(struct drbd_conf *mdev);
 extern int drbd_send_sr_reply(struct drbd_conf *mdev, enum drbd_state_rv retcode);
+extern int conn_send_sr_reply(struct drbd_tconn *tconn, enum drbd_state_rv retcode);
 extern void drbd_free_bc(struct drbd_backing_dev *ldev);
 extern void drbd_mdev_cleanup(struct drbd_conf *mdev);
 void drbd_print_uuids(struct drbd_conf *mdev, const char *text);

drivers/block/drbd/drbd_main.c

@@ -990,6 +990,16 @@ int drbd_send_sr_reply(struct drbd_conf *mdev, enum drbd_state_rv retcode)
 	return drbd_send_cmd(mdev, USE_META_SOCKET, P_STATE_CHG_REPLY, &p.head, sizeof(p));
 }
 
+int conn_send_sr_reply(struct drbd_tconn *tconn, enum drbd_state_rv retcode)
+{
+	struct p_req_state_reply p;
+	enum drbd_packet cmd = tconn->agreed_pro_version < 100 ? P_STATE_CHG_REPLY : P_CONN_ST_CHG_REPLY;
+
+	p.retcode    = cpu_to_be32(retcode);
+
+	return conn_send_cmd(tconn, 0, USE_META_SOCKET, cmd, &p.head, sizeof(p));
+}
+
 int fill_bitmap_rle_bits(struct drbd_conf *mdev,
 	struct p_compressed_bm *p,
 	struct bm_xfer_ctx *c)

drivers/block/drbd/drbd_receiver.c

@@ -3232,9 +3232,14 @@ static int receive_req_state(struct drbd_conf *mdev, enum drbd_packet cmd,
 	mask = convert_state(mask);
 	val = convert_state(val);
 
-	rv = drbd_change_state(mdev, CS_VERBOSE, mask, val);
+	if (cmd == P_CONN_ST_CHG_REQ) {
+		rv = conn_request_state(mdev->tconn, mask, val, CS_VERBOSE | CS_LOCAL_ONLY);
+		conn_send_sr_reply(mdev->tconn, rv);
+	} else {
+		rv = drbd_change_state(mdev, CS_VERBOSE, mask, val);
+		drbd_send_sr_reply(mdev, rv);
+	}
 
-	drbd_send_sr_reply(mdev, rv);
 	drbd_md_sync(mdev);
 
 	return true;
@@ -3768,6 +3773,7 @@ static struct data_cmd drbd_cmd_handler[] = {
 	[P_CSUM_RS_REQUEST] = { 1, sizeof(struct p_block_req), receive_DataRequest },
 	[P_DELAY_PROBE]     = { 0, sizeof(struct p_delay_probe93), receive_skip },
 	[P_OUT_OF_SYNC]     = { 0, sizeof(struct p_block_desc), receive_out_of_sync },
+	[P_CONN_ST_CHG_REQ] = { 0, sizeof(struct p_req_state), receive_req_state },
 	/* anything missing from this table is in
 	 * the asender_tbl, see get_asender_cmd */
 	[P_MAX_CMD]	    = { 0, 0, NULL },

drivers/block/drbd/drbd_state.h

@@ -63,6 +63,7 @@ enum chg_state_flags {
 	CS_SERIALIZE    = 8,
 	CS_ORDERED      = CS_WAIT_COMPLETE + CS_SERIALIZE,
 	CS_NO_CSTATE_CHG = 16, /* Do not display changes in cstate. Internal to drbd_state.c */
+	CS_LOCAL_ONLY = 32, /* Do not consider a device pair wide state change */
 };
 
 extern enum drbd_state_rv drbd_change_state(struct drbd_conf *mdev,