RBD volumes for bare-metal hosts

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Hello Guys,

I wonder about a method for providing bare-metal hosts with an access
to RBD volumes.

The most obvious solution is krbd. Unfortunately, it has a substantial
feature gap in comparison to librbd [1][2]. exclusive-lock seems to be
the basic dependency that should be satisfied to even start thinking
about the rest. Is someone working on this feature? What are the plans
in general?

I also saw that Jewel brought a new interesting concept: rbd-nbd.
It was mentioned in the pull request [2] that an internal testing
shows performance comparable with krbd. Could someone share
a bit more detail in that matter?

Best regards,
Radoslaw Zarzynski

[1] https://github.com/ceph/ceph-client/blob/for-linus/drivers/block/rbd.c#L121
[2] https://github.com/ceph/ceph/blob/master/src/include/rbd/features.h#L25
[3] https://github.com/ceph/ceph/pull/6657
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