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Subject[PATCH v3 2/2] SUNRPC: move per-net operations from svc_destroy()
From
Date
v2:
1) Increase per-net usage counted in lockd_up_net(), because of note 2.

The idea is to separate service destruction and per-net operations, because
these are two different things and it's mix looks ugly.

Notes:
1) For NFS server this patch looks ugly (sorry for that). But these place will be
rewritten soon during NFSd containerization.
2) LockD per-net counter increase int lockd_up() was moved prior to
make_socks() to make lockd_down_net() call safe in case of error.

Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com>
---
fs/lockd/svc.c | 27 +++++++++++++++------------
fs/nfs/callback.c | 3 +++
fs/nfsd/nfsctl.c | 4 ++++
fs/nfsd/nfssvc.c | 7 +++++++
net/sunrpc/svc.c | 4 ----
5 files changed, 29 insertions(+), 16 deletions(-)
diff --git a/fs/lockd/svc.c b/fs/lockd/svc.c
index b7e92ed..3250f28 100644
--- a/fs/lockd/svc.c
+++ b/fs/lockd/svc.c
@@ -257,7 +257,7 @@ static int lockd_up_net(struct net *net)
struct svc_serv *serv = nlmsvc_rqst->rq_server;
int error;

- if (ln->nlmsvc_users)
+ if (ln->nlmsvc_users++)
return 0;

error = svc_rpcb_setup(serv, net);
@@ -272,6 +272,7 @@ static int lockd_up_net(struct net *net)
err_socks:
svc_rpcb_cleanup(serv, net);
err_rpcb:
+ ln->nlmsvc_users--;
return error;
}

@@ -299,6 +300,7 @@ int lockd_up(struct net *net)
{
struct svc_serv *serv;
int error = 0;
+ struct lockd_net *ln = net_generic(net, lockd_net_id);

mutex_lock(&nlmsvc_mutex);
/*
@@ -330,9 +332,11 @@ int lockd_up(struct net *net)
goto destroy_and_out;
}

+ ln->nlmsvc_users++;
+
error = make_socks(serv, net);
if (error < 0)
- goto destroy_and_out;
+ goto err_start;

/*
* Create the kernel thread and wait for it to start.
@@ -344,7 +348,7 @@ int lockd_up(struct net *net)
printk(KERN_WARNING
"lockd_up: svc_rqst allocation failed, error=%d\n",
error);
- goto destroy_and_out;
+ goto err_start;
}

svc_sock_update_bufs(serv);
@@ -358,7 +362,7 @@ int lockd_up(struct net *net)
nlmsvc_rqst = NULL;
printk(KERN_WARNING
"lockd_up: kthread_run failed, error=%d\n", error);
- goto destroy_and_out;
+ goto err_start;
}

/*
@@ -368,14 +372,14 @@ int lockd_up(struct net *net)
destroy_and_out:
svc_destroy(serv);
out:
- if (!error) {
- struct lockd_net *ln = net_generic(net, lockd_net_id);
-
- ln->nlmsvc_users++;
+ if (!error)
nlmsvc_users++;
- }
mutex_unlock(&nlmsvc_mutex);
return error;
+
+err_start:
+ lockd_down_net(net);
+ goto destroy_and_out;
}
EXPORT_SYMBOL_GPL(lockd_up);

@@ -386,11 +390,10 @@ void
lockd_down(struct net *net)
{
mutex_lock(&nlmsvc_mutex);
+ lockd_down_net(net);
if (nlmsvc_users) {
- if (--nlmsvc_users) {
- lockd_down_net(net);
+ if (--nlmsvc_users)
goto out;
- }
} else {
printk(KERN_ERR "lockd_down: no users! task=%p\n",
nlmsvc_task);
diff --git a/fs/nfs/callback.c b/fs/nfs/callback.c
index 26b38fb..cff3940 100644
--- a/fs/nfs/callback.c
+++ b/fs/nfs/callback.c
@@ -314,6 +314,8 @@ out_err:
dprintk("NFS: Couldn't create callback socket or server thread; "
"err = %d\n", ret);
cb_info->users--;
+ if (serv)
+ svc_shutdown_net(serv, net);
goto out;
}

@@ -328,6 +330,7 @@ void nfs_callback_down(int minorversion)
cb_info->users--;
if (cb_info->users == 0 && cb_info->task != NULL) {
kthread_stop(cb_info->task);
+ svc_shutdown_net(cb_info->serv, current->nsproxy->net_ns);
svc_exit_thread(cb_info->rqst);
cb_info->serv = NULL;
cb_info->rqst = NULL;
diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index 7269988..efb3818 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -672,6 +672,8 @@ static ssize_t __write_ports_addfd(char *buf)

err = svc_addsock(nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT);
if (err < 0) {
+ if (nfsd_serv->sv_nrthreads == 1)
+ svc_shutdown_net(nfsd_serv, current->nsproxy->net_ns);
svc_destroy(nfsd_serv);
return err;
}
@@ -740,6 +742,8 @@ out_close:
svc_xprt_put(xprt);
}
out_err:
+ if (nfsd_serv->sv_nrthreads == 1)
+ svc_shutdown_net(nfsd_serv, current->nsproxy->net_ns);
svc_destroy(nfsd_serv);
return err;
}
diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c
index 0762f3c..3fffe6c 100644
--- a/fs/nfsd/nfssvc.c
+++ b/fs/nfsd/nfssvc.c
@@ -426,6 +426,9 @@ int nfsd_set_nrthreads(int n, int *nthreads)
if (err)
break;
}
+
+ if (nfsd_serv->sv_nrthreads == 1)
+ svc_shutdown_net(nfsd_serv, current->nsproxy->net_ns);
svc_destroy(nfsd_serv);

return err;
@@ -473,6 +476,8 @@ out_shutdown:
if (error < 0 && !nfsd_up_before)
nfsd_shutdown();
out_destroy:
+ if (nfsd_serv->sv_nrthreads == 1)
+ svc_shutdown_net(nfsd_serv, current->nsproxy->net_ns);
svc_destroy(nfsd_serv); /* Release server */
out:
mutex_unlock(&nfsd_mutex);
@@ -670,6 +675,8 @@ int nfsd_pool_stats_release(struct inode *inode, struct file *file)
int ret = seq_release(inode, file);
mutex_lock(&nfsd_mutex);
/* this function really, really should have been called svc_put() */
+ if (nfsd_serv->sv_nrthreads == 1)
+ svc_shutdown_net(nfsd_serv, current->nsproxy->net_ns);
svc_destroy(nfsd_serv);
mutex_unlock(&nfsd_mutex);
return ret;
diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c
index e6d542c..b7210f5 100644
--- a/net/sunrpc/svc.c
+++ b/net/sunrpc/svc.c
@@ -537,8 +537,6 @@ EXPORT_SYMBOL_GPL(svc_shutdown_net);
void
svc_destroy(struct svc_serv *serv)
{
- struct net *net = current->nsproxy->net_ns;
-
dprintk("svc: svc_destroy(%s, %d)\n",
serv->sv_program->pg_name,
serv->sv_nrthreads);
@@ -553,8 +551,6 @@ svc_destroy(struct svc_serv *serv)

del_timer_sync(&serv->sv_temptimer);

- svc_shutdown_net(serv, net);
-
/*
* The last user is gone and thus all sockets have to be destroyed to
* the point. Check this.


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