Now that they are not used in by other opcodes by chaining,
this can easily be done.
---
 lib/cmdlib.py |   39 ++++++++++++++++++++++++++-------------
 1 files changed, 26 insertions(+), 13 deletions(-)

diff --git a/lib/cmdlib.py b/lib/cmdlib.py
index 3f7fc04..e450a6f 100644
--- a/lib/cmdlib.py
+++ b/lib/cmdlib.py
@@ -1832,6 +1832,16 @@ class LUActivateInstanceDisks(NoHooksLU):
 
   """
   _OP_REQP = ["instance_name"]
+  REQ_BGL = False
+
+  def ExpandNames(self):
+    self._ExpandAndLockInstance()
+    self.needed_locks[locking.LEVEL_NODE] = []
+    self.recalculate_locks[locking.LEVEL_NODE] = 'replace'
+
+  def DeclareLocks(self, level):
+    if level == locking.LEVEL_NODE:
+      self._LockInstancesNodes()
 
   def CheckPrereq(self):
     """Check prerequisites.
@@ -1839,13 +1849,9 @@ class LUActivateInstanceDisks(NoHooksLU):
     This checks that the instance is in the cluster.
 
     """
-    instance = self.cfg.GetInstanceInfo(
-      self.cfg.ExpandInstanceName(self.op.instance_name))
-    if instance is None:
-      raise errors.OpPrereqError("Instance '%s' not known" %
-                                 self.op.instance_name)
-    self.instance = instance
-
+    self.instance = self.cfg.GetInstanceInfo(self.op.instance_name)
+    assert self.instance is not None, \
+      "Cannot retrieve locked instance %s" % self.op.instance_name
 
   def Exec(self, feedback_fn):
     """Activate the disks.
@@ -1939,6 +1945,16 @@ class LUDeactivateInstanceDisks(NoHooksLU):
 
   """
   _OP_REQP = ["instance_name"]
+  REQ_BGL = False
+
+  def ExpandNames(self):
+    self._ExpandAndLockInstance()
+    self.needed_locks[locking.LEVEL_NODE] = []
+    self.recalculate_locks[locking.LEVEL_NODE] = 'replace'
+
+  def DeclareLocks(self, level):
+    if level == locking.LEVEL_NODE:
+      self._LockInstancesNodes()
 
   def CheckPrereq(self):
     """Check prerequisites.
@@ -1946,12 +1962,9 @@ class LUDeactivateInstanceDisks(NoHooksLU):
     This checks that the instance is in the cluster.
 
     """
-    instance = self.cfg.GetInstanceInfo(
-      self.cfg.ExpandInstanceName(self.op.instance_name))
-    if instance is None:
-      raise errors.OpPrereqError("Instance '%s' not known" %
-                                 self.op.instance_name)
-    self.instance = instance
+    self.instance = self.cfg.GetInstanceInfo(self.op.instance_name)
+    assert self.instance is not None, \
+      "Cannot retrieve locked instance %s" % self.op.instance_name
 
   def Exec(self, feedback_fn):
     """Deactivate the disks
-- 
1.5.6.5

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