from ganeti import config
from ganeti import ssconf
from ganeti import logger
+from ganeti import locking
class Processor(object):
"""
self.context = context
self._feedback_fn = feedback
+ self.exclusive_BGL = False
def ExecOpCode(self, op):
"""Execute an opcode.
sstore = ssconf.SimpleStore()
write_count = self.context.cfg.write_count
- lu = lu_class(self, op, self.context.cfg, sstore)
- lu.CheckPrereq()
- hm = HooksMaster(rpc.call_hooks_runner, self, lu)
- h_results = hm.RunPhase(constants.HOOKS_PHASE_PRE)
- lu.HooksCallBack(constants.HOOKS_PHASE_PRE,
- h_results, self._feedback_fn, None)
+
+ # Acquire the Big Ganeti Lock exclusively if this LU requires it, and in a
+ # shared fashion otherwise (to prevent concurrent run with an exclusive LU.
+ self.context.GLM.acquire(locking.LEVEL_CLUSTER, [locking.BGL],
+ shared=not lu_class.REQ_BGL)
try:
- result = lu.Exec(self._feedback_fn)
- h_results = hm.RunPhase(constants.HOOKS_PHASE_POST)
- result = lu.HooksCallBack(constants.HOOKS_PHASE_POST,
- h_results, self._feedback_fn, result)
- finally:
- if lu.cfg is not None:
- # we use lu.cfg and not self.cfg as for init cluster, self.cfg
- # is None but lu.cfg has been recently initialized in the
- # lu.Exec method
- if write_count != lu.cfg.write_count:
+ self.exclusive_BGL = lu_class.REQ_BGL
+ lu = lu_class(self, op, self.context.cfg, sstore)
+ lu.CheckPrereq()
+ hm = HooksMaster(rpc.call_hooks_runner, self, lu)
+ h_results = hm.RunPhase(constants.HOOKS_PHASE_PRE)
+ lu.HooksCallBack(constants.HOOKS_PHASE_PRE, h_results,
+ self._feedback_fn, None)
+ try:
+ result = lu.Exec(self._feedback_fn)
+ h_results = hm.RunPhase(constants.HOOKS_PHASE_POST)
+ result = lu.HooksCallBack(constants.HOOKS_PHASE_POST, h_results,
+ self._feedback_fn, result)
+ finally:
+ # FIXME: This needs locks if not lu_class.REQ_BGL
+ if write_count != self.context.cfg.write_count:
hm.RunConfigUpdate()
+ finally:
+ self.context.GLM.release(locking.LEVEL_CLUSTER)
+ self.exclusive_BGL = False
return result
if lu_class is None:
raise errors.OpCodeUnknown("Unknown opcode")
+ if lu_class.REQ_BGL and not self.exclusive_BGL:
+ raise errors.ProgrammerError("LUs which require the BGL cannot"
+ " be chained to granular ones.")
+
if lu_class.REQ_WSSTORE:
sstore = ssconf.WritableSimpleStore()
else: