lockd: introduce lockd_put()
There is some cleanup that is duplicated in lockd_down() and the failure path of lockd_up(). Factor these out into a new lockd_put() and call it from both places. lockd_put() does *not* take the mutex - that must be held by the caller. It decrements nlmsvc_users and if that reaches zero, it cleans up. Signed-off-by: NeilBrown <neilb@suse.de> Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
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@ -351,14 +351,6 @@ static struct notifier_block lockd_inet6addr_notifier = {
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};
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};
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#endif
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#endif
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static void lockd_unregister_notifiers(void)
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{
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unregister_inetaddr_notifier(&lockd_inetaddr_notifier);
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#if IS_ENABLED(CONFIG_IPV6)
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unregister_inet6addr_notifier(&lockd_inet6addr_notifier);
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#endif
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}
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static int lockd_start_svc(struct svc_serv *serv)
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static int lockd_start_svc(struct svc_serv *serv)
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{
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{
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int error;
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int error;
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@ -450,6 +442,27 @@ static int lockd_create_svc(void)
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return 0;
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return 0;
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}
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}
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static void lockd_put(void)
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{
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if (WARN(nlmsvc_users <= 0, "lockd_down: no users!\n"))
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return;
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if (--nlmsvc_users)
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return;
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unregister_inetaddr_notifier(&lockd_inetaddr_notifier);
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#if IS_ENABLED(CONFIG_IPV6)
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unregister_inet6addr_notifier(&lockd_inet6addr_notifier);
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#endif
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if (nlmsvc_task) {
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kthread_stop(nlmsvc_task);
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dprintk("lockd_down: service stopped\n");
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nlmsvc_task = NULL;
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}
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nlmsvc_serv = NULL;
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dprintk("lockd_down: service destroyed\n");
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}
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/*
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/*
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* Bring up the lockd process if it's not already up.
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* Bring up the lockd process if it's not already up.
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*/
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*/
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@ -461,21 +474,16 @@ int lockd_up(struct net *net, const struct cred *cred)
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error = lockd_create_svc();
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error = lockd_create_svc();
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if (error)
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if (error)
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goto err_create;
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goto err;
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nlmsvc_users++;
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error = lockd_up_net(nlmsvc_serv, net, cred);
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error = lockd_up_net(nlmsvc_serv, net, cred);
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if (error < 0) {
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if (error < 0) {
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goto err_put;
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lockd_put();
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goto err;
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}
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}
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nlmsvc_users++;
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err:
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err_put:
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if (nlmsvc_users == 0) {
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lockd_unregister_notifiers();
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kthread_stop(nlmsvc_task);
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nlmsvc_serv = NULL;
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}
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err_create:
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mutex_unlock(&nlmsvc_mutex);
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mutex_unlock(&nlmsvc_mutex);
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return error;
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return error;
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}
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}
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@ -489,25 +497,7 @@ lockd_down(struct net *net)
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{
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{
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mutex_lock(&nlmsvc_mutex);
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mutex_lock(&nlmsvc_mutex);
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lockd_down_net(nlmsvc_serv, net);
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lockd_down_net(nlmsvc_serv, net);
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if (nlmsvc_users) {
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lockd_put();
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if (--nlmsvc_users)
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goto out;
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} else {
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printk(KERN_ERR "lockd_down: no users! task=%p\n",
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nlmsvc_task);
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BUG();
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}
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if (!nlmsvc_task) {
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printk(KERN_ERR "lockd_down: no lockd running.\n");
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BUG();
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}
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lockd_unregister_notifiers();
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kthread_stop(nlmsvc_task);
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dprintk("lockd_down: service destroyed\n");
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nlmsvc_serv = NULL;
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nlmsvc_task = NULL;
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out:
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mutex_unlock(&nlmsvc_mutex);
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mutex_unlock(&nlmsvc_mutex);
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}
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}
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EXPORT_SYMBOL_GPL(lockd_down);
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EXPORT_SYMBOL_GPL(lockd_down);
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