Is it possible to restrict to map rbd image on different client hosts same time?

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Hello

I've just created a bug about list of watchers of rbd image and list of clients actually using this rbd image: http://tracker.ceph.com/issues/20943

During reproducing of this bug several questions raised:

1) Does watcher in rbd status output should be treated as 100% reliable mark that disk was mapped?

2) And in other way: Does watcher absence should be treated as 100% reliable mark that disk was not mapped?

3) And finally: Is it possible to restrict to map disk on several clients in the same time (exclusive mapping)?



Thanks!

--
Aleksei
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