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SubjectRe: [PATCH v7 08/14] nvmet-core: allow one host per passthru-ctrl
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>>> I don't understand why we don't limit a regular ctrl to single access
>>> and we do it for the PT ctrl.
>>>
>>> I guess the block layer helps to sync between multiple access in
>>> parallel but we can do it as well.
>>>
>>> Also, let's say you limit the access to this subsystem to 1 user, the
>>> bdev is still accessibly for local user and also you can create a
>>> different subsystem that will use this device (PT and non-PT ctrl).
>>>
>>> Sagi,
>>>
>>> can you explain the trouble you meant and how this limitation solve it ?
>>
>> Its different to emulate the controller with all its admin
>> commands vs. passing it through to the nvme device.. (think of format
>> nvm)
>>
>>
>>
> we don't need to support format command for PT ctrl as we don't support
> other commands such create_sq/cq.

That is just an example, basically every command that we are not aware
of we simply passthru to the drive without knowing the implications
on a multi-host environment..

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