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b/doc/design-daemons.rst
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  provided for convenience, it's redundant wrt. *list* and *update*. Immediate,
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  never fails.
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Addidional restrictions due to lock implications:
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  Ganeti supports locks that act as if a lock on a whole group (like all nodes)
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  were held. To avoid dead locks caused by the additional blockage of those
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  group locks, we impose certain restrictions. Whenever `A` is a group lock and
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  `B` belongs to `A`, then the following holds.
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  - `A` is in lock order before `B`.
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  - All locks that are in the lock order between `A` and `B` also belong to `A`.
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  - It is considered a lock-order violation to ask for an exclusive lock on `B`
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    while holding a shared lock on `A`.
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After this step it'll be possible to use locks from jobs as separate processes.
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The above set of operations allows the clients to use various work-flows. In particular:

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