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    SubjectRe: [PATCH] xen-blkback: Switch to closed state after releasing the backing device
    On Fri, Sep 07, 2018 at 09:23:19AM +0200, Valentin Vidic wrote:
    > On Fri, Sep 07, 2018 at 09:15:30AM +0200, Roger Pau Monné wrote:
    > > I'm not sure that's a good idea, there are a lot of backends (apart
    > > from blkback), and the tools won't know whether a specific backend
    > > supports such state or not. Also the current protocol and states are
    > > shared between all the Xen PV devices, so new additions should be
    > > considered very carefully.
    >
    > Sure, I understand.
    >
    > > IMO the best options are either calling vbd_free/vbd_create at proper
    > > stages in blkback or changing the hotplug script so it waits for the
    > > device to have no open clients.
    >
    > Changing the block-drbd script would be ideal for me too, but I don't
    > think that piece of DRBD state is exposed at the moment.

    Then I'm afraid you will have to look into the vbd_free/create fix.

    Thanks, Roger.

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