SUNRPC: Make create_client() take a reference to the rpciod workqueue

Ensures that an rpc_client always has the possibility to send asynchronous
RPC calls.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

2 files changed, 7 insertions, 31 deletions

diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index 78bbb359281d..fe838e996ee3 100644
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -111,6 +111,9 @@ static struct rpc_clnt * rpc_new_client(struct rpc_xprt *xprt, char *servname, s
         dprintk("RPC:       creating %s client for %s (xprt %p)\n",
                         program->name, servname, xprt);
 
+        err = rpciod_up();
+        if (err)
+                goto out_no_rpciod;
         err = -EINVAL;
         if (!xprt)
                 goto out_no_xprt;
@@ -191,6 +194,8 @@ out_no_stats:
 out_err:
         xprt_put(xprt);
 out_no_xprt:
+        rpciod_down();
+out_no_rpciod:
         return ERR_PTR(err);
 }
 
@@ -287,6 +292,7 @@ rpc_clone_client(struct rpc_clnt *clnt)
         xprt_get(clnt->cl_xprt);
         kref_get(&clnt->cl_kref);
         rpc_register_client(new);
+        rpciod_up();
         return new;
 out_no_path:
         rpc_free_iostats(new->cl_metrics);
@@ -344,6 +350,7 @@ out_free:
         rpc_free_iostats(clnt->cl_metrics);
         clnt->cl_metrics = NULL;
         xprt_put(clnt->cl_xprt);
+        rpciod_down();
         kfree(clnt);
 }
 
diff --git a/net/sunrpc/sched.c b/net/sunrpc/sched.c
index f6eed4d4e5dd..05825154ddd9 100644
--- a/net/sunrpc/sched.c
+++ b/net/sunrpc/sched.c
@@ -39,7 +39,6 @@ static mempool_t	*rpc_task_mempool __read_mostly;
 static mempool_t        *rpc_buffer_mempool __read_mostly;
 
 static void                     __rpc_default_timer(struct rpc_task *task);
-static void                     rpciod_killall(void);
 static void                     rpc_async_schedule(struct work_struct *);
 static void                      rpc_release_task(struct rpc_task *task);
 
@@ -52,7 +51,6 @@ static RPC_WAITQ(delay_queue, "delayq");
  * All RPC clients are linked into this list
  */
 static LIST_HEAD(all_clients);
-static DECLARE_WAIT_QUEUE_HEAD(client_kill_wait);
 
 /*
  * rpciod-related stuff
@@ -996,32 +994,6 @@ void rpc_killall_tasks(struct rpc_clnt *clnt)
         spin_unlock(&clnt->cl_lock);
 }
 
-static void rpciod_killall(void)
-{
-        struct rpc_clnt *clnt;
-        unsigned long flags;
-
-        for(;;) {
-                clear_thread_flag(TIF_SIGPENDING);
-
-                spin_lock(&rpc_sched_lock);
-                list_for_each_entry(clnt, &all_clients, cl_clients)
-                        rpc_killall_tasks(clnt);
-                spin_unlock(&rpc_sched_lock);
-                flush_workqueue(rpciod_workqueue);
-                if (!list_empty(&all_clients))
-                        break;
-                dprintk("RPC:       rpciod_killall: waiting for tasks "
-                                        "to exit\n");
-                wait_event_timeout(client_kill_wait,
-                                list_empty(&all_clients), 1*HZ);
-        }
-
-        spin_lock_irqsave(&current->sighand->siglock, flags);
-        recalc_sigpending();
-        spin_unlock_irqrestore(&current->sighand->siglock, flags);
-}
-
 void rpc_register_client(struct rpc_clnt *clnt)
 {
         spin_lock(&rpc_sched_lock);
@@ -1033,8 +1005,6 @@ void rpc_unregister_client(struct rpc_clnt *clnt)
 {
         spin_lock(&rpc_sched_lock);
         list_del(&clnt->cl_clients);
-        if (list_empty(&all_clients))
-                wake_up(&client_kill_wait);
         spin_unlock(&rpc_sched_lock);
 }
 
@@ -1083,7 +1053,6 @@ rpciod_down(void)
         dprintk("RPC:       destroying workqueue rpciod\n");
 
         if (atomic_read(&rpciod_users) == 0 && rpciod_workqueue != NULL) {
-                rpciod_killall();
                 destroy_workqueue(rpciod_workqueue);
                 rpciod_workqueue = NULL;
         }