nvmet: Fix possible infinite loop triggered on hot namespace removal
When removing a namespace we delete it from the subsystem namespaces list with list_del_init which allows us to know if it is enabled or not. The problem is that list_del_init initialize the list next and does not respect the RCU list-traversal we do on the IO path for locating a namespace. Instead we need to use list_del_rcu which is allowed to run concurrently with the _rcu list-traversal primitives (keeps list next intact) and guarantees concurrent nvmet_find_naespace forward progress. By changing that, we cannot rely on ns->dev_link for knowing if the namspace is enabled, so add enabled indicator entry to nvmet_ns for that. Signed-off-by: NSagi Grimberg <sagi@grimberg.me> Signed-off-by: NSolganik Alexander <sashas@lightbitslabs.com> Cc: <stable@vger.kernel.org> # v4.8+
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