This will be used to lock the instance's nodes in addition to some more.
---
 lib/cmdlib.py    |    6 +++++-
 lib/constants.py |    1 +
 2 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/lib/cmdlib.py b/lib/cmdlib.py
index 272f07f..6bd14b8 100644
--- a/lib/cmdlib.py
+++ b/lib/cmdlib.py
@@ -298,7 +298,11 @@ class LogicalUnit(object):
       wanted_nodes.append(instance.primary_node)
       if not primary_only:
         wanted_nodes.extend(instance.secondary_nodes)
-    self.needed_locks[locking.LEVEL_NODE] = wanted_nodes
+
+    if self.recalculate_locks[locking.LEVEL_NODE] == constants.LOCKS_REPLACE:
+      self.needed_locks[locking.LEVEL_NODE] = wanted_nodes
+    elif self.recalculate_locks[locking.LEVEL_NODE] == constants.LOCKS_APPEND:
+      self.needed_locks[locking.LEVEL_NODE].extend(wanted_nodes)
 
     del self.recalculate_locks[locking.LEVEL_NODE]
 
diff --git a/lib/constants.py b/lib/constants.py
index c3863ea..ba0e1d7 100644
--- a/lib/constants.py
+++ b/lib/constants.py
@@ -190,6 +190,7 @@ REPLACE_DISK_ALL = "replace_all"
 
 # lock recalculate mode
 LOCKS_REPLACE = 'replace'
+LOCKS_APPEND = 'append'
 
 # instance creation modes
 INSTANCE_CREATE = "create"
-- 
1.5.6.5

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