int register_xenstore_notifier(struct notifier_block *nb)
{
int ret = 0;
if (is_xenstored_ready())
ret = nb->notifier_call(nb, 0, NULL);
else
blocking_notifier_chain_register(&xenstore_chain, nb);
return ret;
}
void xenbus_probe(void *unused)
{
BUG_ON(!is_xenstored_ready());
/* Enumerate devices in xenstore and watch for changes. */
xenbus_probe_devices(&xenbus_frontend);
register_xenbus_watch(&fe_watch);
xenbus_backend_probe_and_watch();
/* Notify others that xenstore is up */
blocking_notifier_call_chain(&xenstore_chain, 0, NULL);
}
static ssize_t uuid_show(struct hyp_sysfs_attr *attr, char *buffer)
{
char *vm, *val;
int ret;
if (!is_xenstored_ready())
return -EBUSY;
vm = xenbus_read(XBT_NIL, "vm", "", NULL);
if (IS_ERR(vm))
return PTR_ERR(vm);
val = xenbus_read(XBT_NIL, vm, "uuid", NULL);
kfree(vm);
if (IS_ERR(val))
return PTR_ERR(val);
ret = sprintf(buffer, "%s\n", val);
kfree(val);
return ret;
}
