Synnefo » snf-ganeti

Addidional restrictions due to lock implications:

  Ganeti supports locks that act as if a lock on a whole group (like all nodes)

  were held. To avoid dead locks caused by the additional blockage of those

  group locks, we impose certain restrictions. Whenever `A` is a group lock and

  `B` belongs to `A`, then the following holds.

  - `A` is in lock order before `B`.

  - All locks that are in the lock order between `A` and `B` also belong to `A`.

  - It is considered a lock-order violation to ask for an exclusive lock on `B`

    while holding a shared lock on `A`.