mgr/cephadm: add ordering function for SMB

SMB with CTDB (needed for HA) assumes the SMB daemons
of a lower rank will be starting before the daemons of
a higher rank. The new function in this commit tells
cephadm it must deploy them sequentially in that order.

Signed-off-by: Adam King <[email protected]>
(cherry picked from commit 833f74d)

Resolves: rhbz#2372821

Author: adk3798

src/pybind/mgr/cephadm/services/smb.py

@@ -114,6 +114,14 @@ def generate_config(
         self._configure_cluster_meta(smb_spec, daemon_spec)
         return config_blobs, []
 
+    def get_daemon_deployment_ordering(self, daemons: List[CephadmDaemonDeploySpec]) -> Dict[int, List[CephadmDaemonDeploySpec]]:
+        if not daemons:
+            return {}
+        # order SMB deployment by the rank of the daemon
+        # This is necessary in order for CTDB to work
+        sorted_by_rank = sorted(daemons, key=lambda dd: dd.rank or -1)
+        return {i: [sorted_by_rank[i]] for i in range(len(sorted_by_rank))}
+
     def config_dashboard(
         self, daemon_descrs: List[DaemonDescription]
     ) -> None: