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>
diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index 78bbb35..fe838e9 100644
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -111,6 +111,9 @@
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_err:
xprt_put(xprt);
out_no_xprt:
+ rpciod_down();
+out_no_rpciod:
return ERR_PTR(err);
}
@@ -287,6 +292,7 @@
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 @@
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 f6eed4d..0582515 100644
--- a/net/sunrpc/sched.c
+++ b/net/sunrpc/sched.c
@@ -39,7 +39,6 @@
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 @@
* 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 @@
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(¤t->sighand->siglock, flags);
- recalc_sigpending();
- spin_unlock_irqrestore(¤t->sighand->siglock, flags);
-}
-
void rpc_register_client(struct rpc_clnt *clnt)
{
spin_lock(&rpc_sched_lock);
@@ -1033,8 +1005,6 @@
{
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 @@
dprintk("RPC: destroying workqueue rpciod\n");
if (atomic_read(&rpciod_users) == 0 && rpciod_workqueue != NULL) {
- rpciod_killall();
destroy_workqueue(rpciod_workqueue);
rpciod_workqueue = NULL;
}