Re: [PATCH v7 08/14] nvmet-core: allow one host per passthru-ctrl

[Sagi Grimberg]

> 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)