[Xen-devel] Xenbus state and domain state are different or same?

To:	xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject:	[Xen-devel] Xenbus state and domain state are different or same?
From:	"pradeep singh rautela" <rautelap@xxxxxxxxx>
Date:	Fri, 18 May 2007 20:37:44 +0530
Cc:	"xen. kernelnewbies" <xenkernelnewbies@xxxxxxxxxxxxxxxx>
Delivery-date:	Fri, 18 May 2007 08:06:00 -0700
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Hi All,

Following definition is from Xen-3.0.4-1 src.

static void backend_changed(struct xenbus_device *dev,
                            enum xenbus_state backend_state)
{
        struct netfront_info *np = dev->dev.driver_data;
        struct net_device *netdev = np->netdev;

        DPRINTK("%s\n", xenbus_strstate(backend_state));

        switch (backend_state) {
        case XenbusStateInitialising:
        case XenbusStateInitialised:
        case XenbusStateConnected:
        case XenbusStateUnknown:
        case XenbusStateClosed:
                break;

        case XenbusStateInitWait:
                if (dev->state != XenbusStateInitialising)
                        break;
                if (network_connect(netdev) != 0)
                        break;
                xenbus_switch_state(dev, XenbusStateConnected);
                (void)send_fake_arp(netdev);
                break;

        case XenbusStateClosing:
                xenbus_frontend_closed(dev);
                break;
        }
}

Now my query is, Can backend state of backend domain  different from
that of dev->state here as depicted here -
 case XenbusStateInitWait:
                if (dev->state != XenbusStateInitialising)

Does this means that state of the backend domain and that of the
Xenbus may not necessarily be same for the frontend Domain?

Thanks in advance

--psr
--
---
pradeep singh rautela

"Genius is 1% inspiration, and 99% perspiration" - not me :)

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[Xen-devel] Xenbus state and domain state are different or same?