initial lock functionality commit

2 files changed, 24 insertions, 0 deletions

diff --git a/nova/db/sqlalchemy/api.py b/nova/db/sqlalchemy/api.py
index 7e945e4cb..6d774b39c 100644
--- a/nova/db/sqlalchemy/api.py
+++ b/nova/db/sqlalchemy/api.py
@@ -856,6 +856,28 @@ def instance_action_create(context, values):
     return action_ref
 
 
+@require_admin_context
+def instance_set_lock(context, instance_id, lock):
+    """
+    twiddle the locked bit in the db
+    lock is a boolean
+
+    """
+    db.instance_update(context,
+                       instance_id,
+                       {'locked': lock})
+
+
+#@require_admin_context
+#def instance_is_locked(context, instance_id):
+#    """
+#    return the boolean state of (instance with instance_id)'s lock
+#
+#    """
+#    instance_ref = instance_get(context, instance_id)
+#    return instance_ref['locked']
+
+
 ###################
 
 
diff --git a/nova/db/sqlalchemy/models.py b/nova/db/sqlalchemy/models.py
index 693db8d23..830ef30a1 100644
--- a/nova/db/sqlalchemy/models.py
+++ b/nova/db/sqlalchemy/models.py
@@ -224,6 +224,8 @@ class Instance(BASE, NovaBase):
     display_name = Column(String(255))
     display_description = Column(String(255))
 
+    locked = Column(Boolean)
+
     # TODO(vish): see Ewan's email about state improvements, probably
     #             should be in a driver base class or some such
     # vmstate_state = running, halted, suspended, paused