On 04/08/14 09:27, jgross@xxxxxxxx wrote:
>
> +
> +static void scsifront_backend_changed(struct xenbus_device *dev,
> + enum xenbus_state backend_state)
> +{
> + struct vscsifrnt_info *info = dev_get_drvdata(&dev->dev);
> +
> + DPRINTK("%p %u %u\n", dev, dev->state, backend_state);
> +
> + switch (backend_state) {
> + case XenbusStateUnknown:
> + case XenbusStateInitialising:
> + case XenbusStateInitWait:
> + case XenbusStateInitialised:
> + break;
> +
> + case XenbusStateConnected:
> + scsifront_read_backend_params(dev, info);
> + if (xenbus_read_driver_state(dev->nodename) ==
> + XenbusStateInitialised) {
> + scsifront_do_lun_hotplug(info, VSCSIFRONT_OP_ADD_LUN);
> + }
> +
> + if (dev->state != XenbusStateConnected)
> + xenbus_switch_state(dev, XenbusStateConnected);
> + break;
> +
> + case XenbusStateClosed:
> + if (dev->state == XenbusStateClosed)
> + break;
> + /* Missed the backend's Closing state -- fallthrough */
> + case XenbusStateClosing:
> + scsifront_disconnect(info);
> + break;
> +
> + case XenbusStateReconfiguring:
> + scsifront_do_lun_hotplug(info, VSCSIFRONT_OP_DEL_LUN);
> + xenbus_switch_state(dev, XenbusStateReconfiguring);
> + break;
> +
> + case XenbusStateReconfigured:
> + scsifront_do_lun_hotplug(info, VSCSIFRONT_OP_ADD_LUN);
> + xenbus_switch_state(dev, XenbusStateConnected);
> + break;
> + }
> +}
I would like to see this state machine in common code but I'm not going
to insist on it since this is a existing driver.
Xen related parts:
Acked-by: David Vrabel <david.vrabel@xxxxxxxxxx>
David
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