5.15-stable review patch. If anyone has any objections, please let me know.
------------------
From: NeilBrown <neilb@xxxxxxx>
[ Upstream commit 2840fe864c91a0fe822169b1fbfddbcac9aeac43 ]
lockd has two globals - nlmsvc_task and nlmsvc_rqst - but mostly it
wants the 'struct svc_serv', and when it doesn't want it exactly it can
get to what it wants from the serv.
This patch is a first step to removing nlmsvc_task and nlmsvc_rqst. It
introduces nlmsvc_serv to store the 'struct svc_serv*'. This is set as
soon as the serv is created, and cleared only when it is destroyed.
Signed-off-by: NeilBrown <neilb@xxxxxxx>
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
---
fs/lockd/svc.c | 36 ++++++++++++++++++++----------------
1 file changed, 20 insertions(+), 16 deletions(-)
diff --git a/fs/lockd/svc.c b/fs/lockd/svc.c
index a9669b106dbde..83874878f41d8 100644
--- a/fs/lockd/svc.c
+++ b/fs/lockd/svc.c
@@ -54,6 +54,7 @@ EXPORT_SYMBOL_GPL(nlmsvc_ops);
static DEFINE_MUTEX(nlmsvc_mutex);
static unsigned int nlmsvc_users;
+static struct svc_serv *nlmsvc_serv;
static struct task_struct *nlmsvc_task;
static struct svc_rqst *nlmsvc_rqst;
unsigned long nlmsvc_timeout;
@@ -306,13 +307,12 @@ static int lockd_inetaddr_event(struct notifier_block *this,
!atomic_inc_not_zero(&nlm_ntf_refcnt))
goto out;
- if (nlmsvc_rqst) {
+ if (nlmsvc_serv) {
dprintk("lockd_inetaddr_event: removed %pI4\n",
&ifa->ifa_local);
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = ifa->ifa_local;
- svc_age_temp_xprts_now(nlmsvc_rqst->rq_server,
- (struct sockaddr *)&sin);
+ svc_age_temp_xprts_now(nlmsvc_serv, (struct sockaddr *)&sin);
}
atomic_dec(&nlm_ntf_refcnt);
wake_up(&nlm_ntf_wq);
@@ -336,14 +336,13 @@ static int lockd_inet6addr_event(struct notifier_block *this,
!atomic_inc_not_zero(&nlm_ntf_refcnt))
goto out;
- if (nlmsvc_rqst) {
+ if (nlmsvc_serv) {
dprintk("lockd_inet6addr_event: removed %pI6\n", &ifa->addr);
sin6.sin6_family = AF_INET6;
sin6.sin6_addr = ifa->addr;
if (ipv6_addr_type(&sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
sin6.sin6_scope_id = ifa->idev->dev->ifindex;
- svc_age_temp_xprts_now(nlmsvc_rqst->rq_server,
- (struct sockaddr *)&sin6);
+ svc_age_temp_xprts_now(nlmsvc_serv, (struct sockaddr *)&sin6);
}
atomic_dec(&nlm_ntf_refcnt);
wake_up(&nlm_ntf_wq);
@@ -423,15 +422,17 @@ static const struct svc_serv_ops lockd_sv_ops = {
.svo_enqueue_xprt = svc_xprt_do_enqueue,
};
-static struct svc_serv *lockd_create_svc(void)
+static int lockd_create_svc(void)
{
struct svc_serv *serv;
/*
* Check whether we're already up and running.
*/
- if (nlmsvc_rqst)
- return svc_get(nlmsvc_rqst->rq_server);
+ if (nlmsvc_serv) {
+ svc_get(nlmsvc_serv);
+ return 0;
+ }
/*
* Sanity check: if there's no pid,
@@ -448,14 +449,15 @@ static struct svc_serv *lockd_create_svc(void)
serv = svc_create(&nlmsvc_program, LOCKD_BUFSIZE, &lockd_sv_ops);
if (!serv) {
printk(KERN_WARNING "lockd_up: create service failed\n");
- return ERR_PTR(-ENOMEM);
+ return -ENOMEM;
}
+ nlmsvc_serv = serv;
register_inetaddr_notifier(&lockd_inetaddr_notifier);
#if IS_ENABLED(CONFIG_IPV6)
register_inet6addr_notifier(&lockd_inet6addr_notifier);
#endif
dprintk("lockd_up: service created\n");
- return serv;
+ return 0;
}
/*
@@ -468,11 +470,10 @@ int lockd_up(struct net *net, const struct cred *cred)
mutex_lock(&nlmsvc_mutex);
- serv = lockd_create_svc();
- if (IS_ERR(serv)) {
- error = PTR_ERR(serv);
+ error = lockd_create_svc();
+ if (error)
goto err_create;
- }
+ serv = nlmsvc_serv;
error = lockd_up_net(serv, net, cred);
if (error < 0) {
@@ -487,6 +488,8 @@ int lockd_up(struct net *net, const struct cred *cred)
}
nlmsvc_users++;
err_put:
+ if (nlmsvc_users == 0)
+ nlmsvc_serv = NULL;
svc_put(serv);
err_create:
mutex_unlock(&nlmsvc_mutex);
@@ -501,7 +504,7 @@ void
lockd_down(struct net *net)
{
mutex_lock(&nlmsvc_mutex);
- lockd_down_net(nlmsvc_rqst->rq_server, net);
+ lockd_down_net(nlmsvc_serv, net);
if (nlmsvc_users) {
if (--nlmsvc_users)
goto out;
@@ -519,6 +522,7 @@ lockd_down(struct net *net)
dprintk("lockd_down: service stopped\n");
lockd_svc_exit_thread();
dprintk("lockd_down: service destroyed\n");
+ nlmsvc_serv = NULL;
nlmsvc_task = NULL;
nlmsvc_rqst = NULL;
out:
--
2.43.0
