Revision fb8dcb62
| b/lib/cmdlib.py | ||
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| 150 | 150 |
else: |
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raise NotImplementedError |
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def DeclareLocks(self, level): |
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"""Declare LU locking needs for a level |
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While most LUs can just declare their locking needs at ExpandNames time, |
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sometimes there's the need to calculate some locks after having acquired |
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the ones before. This function is called just before acquiring locks at a |
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particular level, but after acquiring the ones at lower levels, and permits |
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such calculations. It can be used to modify self.needed_locks, and by |
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default it does nothing. |
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This function is only called if you have something already set in |
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self.needed_locks for the level. |
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@param level: Locking level which is going to be locked |
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@type level: member of ganeti.locking.LEVELS |
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""" |
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def CheckPrereq(self): |
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"""Check prerequisites for this LU. |
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|
| b/lib/mcpu.py | ||
|---|---|---|
| 131 | 131 |
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""" |
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if level in lu.needed_locks: |
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# This gives a chance to LUs to make last-minute changes after acquiring |
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# locks at any preceding level. |
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lu.DeclareLocks(level) |
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# This is always safe to do, as we can't acquire more/less locks than |
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# what was requested. |
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lu.needed_locks[level] = self.context.glm.acquire(level, |
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