/*
* Callback received when the frontend's state changes.
*/
static void frontend_changed(struct xenbus_device *dev,
enum xenbus_state frontend_state)
{
struct backend_info *be = dev_get_drvdata(&dev->dev);
int err;
DPRINTK("%s", xenbus_strstate(frontend_state));
switch (frontend_state) {
case XenbusStateInitialising:
if (dev->state == XenbusStateClosed) {
pr_info(DRV_PFX "%s: prepare for reconnect\n",
dev->nodename);
xenbus_switch_state(dev, XenbusStateInitWait);
}
break;
case XenbusStateInitialised:
case XenbusStateConnected:
/*
* Ensure we connect even when two watches fire in
* close successsion and we miss the intermediate value
* of frontend_state.
*/
if (dev->state == XenbusStateConnected)
break;
/*
* Enforce precondition before potential leak point.
* xen_blkif_disconnect() is idempotent.
*/
xen_blkif_disconnect(be->blkif);
err = connect_ring(be);
if (err)
break;
xen_update_blkif_status(be->blkif);
break;
case XenbusStateClosing:
xenbus_switch_state(dev, XenbusStateClosing);
break;
case XenbusStateClosed:
xen_blkif_disconnect(be->blkif);
xenbus_switch_state(dev, XenbusStateClosed);
if (xenbus_dev_is_online(dev))
break;
/* fall through if not online */
case XenbusStateUnknown:
/* implies xen_blkif_disconnect() via xen_blkbk_remove() */
device_unregister(&dev->dev);
break;
default:
xenbus_dev_fatal(dev, -EINVAL, "saw state %d at frontend",
frontend_state);
break;
}
}
static void frontend_changed(struct xenbus_device *dev,
enum xenbus_state frontend_state)
{
struct backend_info *be = dev->data;
int err;
be->frontend_state = frontend_state;
switch (frontend_state) {
case XenbusStateInitialising:
case XenbusStateInitialised:
break;
case XenbusStateConnected:
err = connect_ring(be);
if (err) {
return;
}
maybe_connect(be);
break;
case XenbusStateClosing:
be->tpmif->tpm_instance = -1;
break;
case XenbusStateClosed:
/*
* Notify the vTPM manager about the front-end
* having left.
*/
tpmif_vtpm_close(be->instance);
device_unregister(&be->dev->dev);
tpmback_remove(dev);
break;
case XenbusStateUnknown:
case XenbusStateInitWait:
default:
xenbus_dev_fatal(dev, -EINVAL,
"saw state %d at frontend",
frontend_state);
break;
}
}
/**
* Callback received when the frontend's state changes.
*/
static void frontend_changed(struct xenbus_device *dev,
enum xenbus_state frontend_state)
{
struct backend_info *be = dev->data;
int err;
DPRINTK("");
switch (frontend_state) {
case XenbusStateInitialising:
break;
case XenbusStateInitialised:
case XenbusStateConnected:
/* Ensure we connect even when two watches fire in
close successsion and we miss the intermediate value
of frontend_state. */
if (dev->state == XenbusStateConnected)
break;
err = connect_ring(be);
if (err)
break;
update_blkif_status(be->blkif);
break;
case XenbusStateClosing:
xenbus_switch_state(dev, XenbusStateClosing);
break;
case XenbusStateClosed:
device_unregister(&dev->dev);
break;
case XenbusStateUnknown:
case XenbusStateInitWait:
default:
xenbus_dev_fatal(dev, -EINVAL, "saw state %d at frontend",
frontend_state);
break;
}
}
static void connect(struct backend_info *be)
{
int err;
struct xenbus_device *dev = be->dev;
err = connect_ring(be);
if(err){
printk("\nxen: dom0: connect ring fail");
return;
}
/*
err = xenbus_watch_pathfmt(dev, &be->hotplug_status_watch,
hotplug_status_changed, "%s/%s", dev->nodename,"hotplug-status");
if(err){
xenbus_switch_state(dev, XenbusStateConnected);
}else{
*/
xenbus_switch_state(dev, XenbusStateConnected);
printk("\nxen: dom0: connect()--change state to XenbusStateConnected");
printk("\nxen: dom0: connect finished, otherend_id ");
}
static void frontend_changed(struct xenbus_device *dev,
enum xenbus_state frontend_state)
{
struct backend_info *be = dev->dev.driver_data;
int err;
switch (frontend_state) {
case XenbusStateInitialising:
case XenbusStateInitialised:
break;
case XenbusStateConnected:
err = connect_ring(be);
if (err) {
return;
}
maybe_connect(be);
break;
case XenbusStateClosing:
be->instance = -1;
break;
case XenbusStateUnknown:
case XenbusStateClosed:
device_unregister(&be->dev->dev);
tpmback_remove(dev);
break;
default:
xenbus_dev_fatal(dev, -EINVAL,
"saw state %d at frontend",
frontend_state);
break;
}
}
