SUNRPC: move per-net operations from svc_destroy()

The idea is to separate service destruction and per-net operations,
because these are two different things and the 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>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

5 files changed, 41 insertions, 19 deletions

diff --git a/fs/lockd/svc.c b/fs/lockd/svc.c
index b7e92ed56885..3250f280a171 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 26b38fb8102e..cff39406f965 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 72699885ac48..c55298ed5772 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -661,6 +661,7 @@ static ssize_t __write_ports_addfd(char *buf)
 {
         char *mesg = buf;
         int fd, err;
+        struct net *net = &init_net;
 
         err = get_int(&mesg, &fd);
         if (err != 0 || fd < 0)
@@ -672,6 +673,8 @@ 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, net);
                 svc_destroy(nfsd_serv);
                 return err;
         }
@@ -709,6 +712,7 @@ static ssize_t __write_ports_addxprt(char *buf)
         char transport[16];
         struct svc_xprt *xprt;
         int port, err;
+        struct net *net = &init_net;
 
         if (sscanf(buf, "%15s %4u", transport, &port) != 2)
                 return -EINVAL;
@@ -720,12 +724,12 @@ static ssize_t __write_ports_addxprt(char *buf)
         if (err != 0)
                 return err;
 
-        err = svc_create_xprt(nfsd_serv, transport, &init_net,
+        err = svc_create_xprt(nfsd_serv, transport, net,
                                 PF_INET, port, SVC_SOCK_ANONYMOUS);
         if (err < 0)
                 goto out_err;
 
-        err = svc_create_xprt(nfsd_serv, transport, &init_net,
+        err = svc_create_xprt(nfsd_serv, transport, net,
                                 PF_INET6, port, SVC_SOCK_ANONYMOUS);
         if (err < 0 && err != -EAFNOSUPPORT)
                 goto out_close;
@@ -734,12 +738,14 @@ static ssize_t __write_ports_addxprt(char *buf)
         nfsd_serv->sv_nrthreads--;
         return 0;
 out_close:
-        xprt = svc_find_xprt(nfsd_serv, transport, &init_net, PF_INET, port);
+        xprt = svc_find_xprt(nfsd_serv, transport, net, PF_INET, port);
         if (xprt != NULL) {
                 svc_close_xprt(xprt);
                 svc_xprt_put(xprt);
         }
 out_err:
+        if (nfsd_serv->sv_nrthreads == 1)
+                svc_shutdown_net(nfsd_serv, net);
         svc_destroy(nfsd_serv);
         return err;
 }
diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c
index 0762f3c9e0fb..ee709fc8f58b 100644
--- a/fs/nfsd/nfssvc.c
+++ b/fs/nfsd/nfssvc.c
@@ -382,6 +382,7 @@ int nfsd_set_nrthreads(int n, int *nthreads)
         int i = 0;
         int tot = 0;
         int err = 0;
+        struct net *net = &init_net;
 
         WARN_ON(!mutex_is_locked(&nfsd_mutex));
 
@@ -426,6 +427,9 @@ int nfsd_set_nrthreads(int n, int *nthreads)
                 if (err)
                         break;
         }
+
+        if (nfsd_serv->sv_nrthreads == 1)
+                svc_shutdown_net(nfsd_serv, net);
         svc_destroy(nfsd_serv);
 
         return err;
@@ -441,6 +445,7 @@ nfsd_svc(unsigned short port, int nrservs)
 {
         int     error;
         bool    nfsd_up_before;
+        struct net *net = &init_net;
 
         mutex_lock(&nfsd_mutex);
         dprintk("nfsd: creating service\n");
@@ -473,6 +478,8 @@ out_shutdown:
         if (error < 0 && !nfsd_up_before)
                 nfsd_shutdown();
 out_destroy:
+        if (nfsd_serv->sv_nrthreads == 1)
+                svc_shutdown_net(nfsd_serv, net);
         svc_destroy(nfsd_serv);         /* Release server */
 out:
         mutex_unlock(&nfsd_mutex);
@@ -556,6 +563,9 @@ nfsd(void *vrqstp)
         nfsdstats.th_cnt --;
 
 out:
+        if (rqstp->rq_server->sv_nrthreads == 1)
+                svc_shutdown_net(rqstp->rq_server, &init_net);
+
         /* Release the thread */
         svc_exit_thread(rqstp);
 
@@ -668,8 +678,12 @@ int nfsd_pool_stats_open(struct inode *inode, struct file *file)
 int nfsd_pool_stats_release(struct inode *inode, struct file *file)
 {
         int ret = seq_release(inode, file);
+        struct net *net = &init_net;
+
         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, net);
         svc_destroy(nfsd_serv);
         mutex_unlock(&nfsd_mutex);
         return ret;
diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c
index e6d542cee0f3..b7210f5cc893 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.