Messages in this thread | | | Subject | Re: [PATCH v7 08/14] nvmet-core: allow one host per passthru-ctrl | From | Sagi Grimberg <> | Date | Thu, 22 Aug 2019 10:41:09 -0700 |
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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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