ctdb-daemon: Add a function to check if db access is allowed

BUG: https://bugzilla.samba.org/show_bug.cgi?id=13021

Signed-off-by: Amitay Isaacs <amitay@gmail.com>
Reviewed-by: Martin Schwenke <martin@meltin.net>
(cherry picked from commit 5d2f2677de65a0fd6683bb759d80ebced604fa6b)

2 files changed, 19 insertions, 0 deletions

diff --git a/ctdb/include/ctdb_private.h b/ctdb/include/ctdb_private.h
index 067777a79f3..043149eedd9 100644
--- a/ctdb/include/ctdb_private.h
+++ b/ctdb/include/ctdb_private.h
@@ -629,6 +629,7 @@ int32_t ctdb_control_wipe_database(struct ctdb_context *ctdb, TDB_DATA indata);
 
 bool ctdb_db_frozen(struct ctdb_db_context *ctdb_db);
 bool ctdb_db_all_frozen(struct ctdb_context *ctdb);
+bool ctdb_db_allow_access(struct ctdb_db_context *ctdb_db);
 
 /* from server/ctdb_keepalive.c */
 
diff --git a/ctdb/server/ctdb_freeze.c b/ctdb/server/ctdb_freeze.c
index d92f707b25d..c41fc7d53ee 100644
--- a/ctdb/server/ctdb_freeze.c
+++ b/ctdb/server/ctdb_freeze.c
@@ -874,3 +874,21 @@ bool ctdb_db_all_frozen(struct ctdb_context *ctdb)
 	}
 	return true;
 }
+
+bool ctdb_db_allow_access(struct ctdb_db_context *ctdb_db)
+{
+	if (ctdb_db->freeze_mode == CTDB_FREEZE_NONE) {
+		/* If database is not frozen, then allow access. */
+		return true;
+	} else if (ctdb_db->freeze_transaction_started) {
+		/* If database is frozen, allow access only if the
+		 * transaction is started.  This is required during
+		 * recovery.
+		 *
+		 * If a node is inactive, then transaction is not started.
+		 */
+		return true;
+	}
+
+	return false;
+}