[PATCH 2/3] libceph: switch to the new "osd blocklist add" command

[Ilya Dryomov <idryomov@gmail.com>]

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
---
 net/ceph/mon_client.c | 65 +++++++++++++++++++++++++++++++++----------
 1 file changed, 50 insertions(+), 15 deletions(-)

diff --git a/net/ceph/mon_client.c b/net/ceph/mon_client.c
index efcdde471278..32bce480f8e4 100644
--- a/net/ceph/mon_client.c
+++ b/net/ceph/mon_client.c
@@ -896,8 +896,8 @@ static void handle_command_ack(struct ceph_mon_client *monc,
 	ceph_msg_dump(msg);
 }
 
-int ceph_monc_blocklist_add(struct ceph_mon_client *monc,
-			    struct ceph_entity_addr *client_addr)
+static int do_mon_command_vargs(struct ceph_mon_client *monc,
+				const char *fmt, va_list ap)
 {
 	struct ceph_mon_generic_request *req;
 	struct ceph_mon_command *h;
@@ -925,28 +925,63 @@ int ceph_monc_blocklist_add(struct ceph_mon_client *monc,
 	h->monhdr.session_mon_tid = 0;
 	h->fsid = monc->monmap->fsid;
 	h->num_strs = cpu_to_le32(1);
-	len = sprintf(h->str, "{ \"prefix\": \"osd blacklist\", \
-		                 \"blacklistop\": \"add\", \
-				 \"addr\": \"%pISpc/%u\" }",
-		      &client_addr->in_addr, le32_to_cpu(client_addr->nonce));
+	len = vsprintf(h->str, fmt, ap);
 	h->str_len = cpu_to_le32(len);
 	send_generic_request(monc, req);
 	mutex_unlock(&monc->mutex);
 
 	ret = wait_generic_request(req);
-	if (!ret)
-		/*
-		 * Make sure we have the osdmap that includes the blocklist
-		 * entry.  This is needed to ensure that the OSDs pick up the
-		 * new blocklist before processing any future requests from
-		 * this client.
-		 */
-		ret = ceph_wait_for_latest_osdmap(monc->client, 0);
-
 out:
 	put_generic_request(req);
 	return ret;
 }
+
+static int do_mon_command(struct ceph_mon_client *monc, const char *fmt, ...)
+{
+	va_list ap;
+	int ret;
+
+	va_start(ap, fmt);
+	ret = do_mon_command_vargs(monc, fmt, ap);
+	va_end(ap);
+	return ret;
+}
+
+int ceph_monc_blocklist_add(struct ceph_mon_client *monc,
+			    struct ceph_entity_addr *client_addr)
+{
+	int ret;
+
+	ret = do_mon_command(monc,
+			     "{ \"prefix\": \"osd blocklist\", \
+				\"blocklistop\": \"add\", \
+				\"addr\": \"%pISpc/%u\" }",
+			     &client_addr->in_addr,
+			     le32_to_cpu(client_addr->nonce));
+	if (ret == -EINVAL) {
+		/*
+		 * The monitor returns EINVAL on an unrecognized command.
+		 * Try the legacy command -- it is exactly the same except
+		 * for the name.
+		 */
+		ret = do_mon_command(monc,
+				     "{ \"prefix\": \"osd blacklist\", \
+					\"blacklistop\": \"add\", \
+					\"addr\": \"%pISpc/%u\" }",
+				     &client_addr->in_addr,
+				     le32_to_cpu(client_addr->nonce));
+	}
+	if (ret)
+		return ret;
+
+	/*
+	 * Make sure we have the osdmap that includes the blocklist
+	 * entry.  This is needed to ensure that the OSDs pick up the
+	 * new blocklist before processing any future requests from
+	 * this client.
+	 */
+	return ceph_wait_for_latest_osdmap(monc->client, 0);
+}
 EXPORT_SYMBOL(ceph_monc_blocklist_add);
 
 /*
-- 
2.19.2