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lockd: move lockd_start_svc() call into lockd_create_svc()

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lockd_start_svc() only needs to be called once, just after the svc is
created.  If the start fails, the svc is discarded too.

It thus makes sense to call lockd_start_svc() from lockd_create_svc().
This allows us to remove the test against nlmsvc_rqst at the start of
lockd_start_svc() - it must always be NULL.

lockd_up() only held an extra reference on the svc until a thread was
created - then it dropped it.  The thread - and thus the extra reference
- will remain until kthread_stop() is called.
Now that the thread is created in lockd_create_svc(), the extra
reference can be dropped there.  So the 'serv' variable is no longer
needed in lockd_up().

Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
NeilBrown 2021-11-29 15:51:25 +11:00 committed by Chuck Lever
parent 5a8a7ff574
commit b73a297204
1 changed files with 10 additions and 12 deletions
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22
fs/lockd/svc.c
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@ -359,9 +359,6 @@ static int lockd_start_svc(struct svc_serv *serv)
{
int error;
if (nlmsvc_rqst)
return 0;
/*
* Create the kernel thread and wait for it to start.
*/
@ -406,6 +403,7 @@ static const struct svc_serv_ops lockd_sv_ops = {
static int lockd_create_svc(void)
{
struct svc_serv *serv;
int error;
/*
* Check whether we're already up and running.
@ -432,6 +430,13 @@ static int lockd_create_svc(void)
printk(KERN_WARNING "lockd_up: create service failed\n");
return -ENOMEM;
}
error = lockd_start_svc(serv);
/* The thread now holds the only reference */
svc_put(serv);
if (error < 0)
return error;
nlmsvc_serv = serv;
register_inetaddr_notifier(&lockd_inetaddr_notifier);
#if IS_ENABLED(CONFIG_IPV6)
@ -446,7 +451,6 @@ static int lockd_create_svc(void)
*/
int lockd_up(struct net *net, const struct cred *cred)
{
struct svc_serv *serv;
int error;
mutex_lock(&nlmsvc_mutex);
@ -454,25 +458,19 @@ int lockd_up(struct net *net, const struct cred *cred)
error = lockd_create_svc();
if (error)
goto err_create;
serv = nlmsvc_serv;
error = lockd_up_net(serv, net, cred);
error = lockd_up_net(nlmsvc_serv, net, cred);
if (error < 0) {
goto err_put;
}
error = lockd_start_svc(serv);
if (error < 0) {
lockd_down_net(serv, net);
goto err_put;
}
nlmsvc_users++;
err_put:
if (nlmsvc_users == 0) {
lockd_unregister_notifiers();
kthread_stop(nlmsvc_task);
nlmsvc_serv = NULL;
}
svc_put(serv);
err_create:
mutex_unlock(&nlmsvc_mutex);
return error;