NFSv4: Fix callback server shutdown
We want to use kthread_stop() in order to ensure the threads are
shut down before we tear down the nfs_callback_info in nfs_callback_down.
Tested-and-reviewed-by: Kinglong Mee <kinglongmee@gmail.com>
Reported-by: Kinglong Mee <kinglongmee@gmail.com>
Fixes: bb6aeba736ba9 ("NFSv4.x: Switch to using svc_set_num_threads()...")
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
diff --git a/fs/nfs/callback.c b/fs/nfs/callback.c
index c5e27eb..73a1f92 100644
--- a/fs/nfs/callback.c
+++ b/fs/nfs/callback.c
@@ -76,7 +76,10 @@ nfs4_callback_svc(void *vrqstp)
set_freezable();
- while (!kthread_should_stop()) {
+ while (!kthread_freezable_should_stop(NULL)) {
+
+ if (signal_pending(current))
+ flush_signals(current);
/*
* Listen for a request on the socket
*/
@@ -85,6 +88,8 @@ nfs4_callback_svc(void *vrqstp)
continue;
svc_process(rqstp);
}
+ svc_exit_thread(rqstp);
+ module_put_and_exit(0);
return 0;
}
@@ -103,9 +108,10 @@ nfs41_callback_svc(void *vrqstp)
set_freezable();
- while (!kthread_should_stop()) {
- if (try_to_freeze())
- continue;
+ while (!kthread_freezable_should_stop(NULL)) {
+
+ if (signal_pending(current))
+ flush_signals(current);
prepare_to_wait(&serv->sv_cb_waitq, &wq, TASK_INTERRUPTIBLE);
spin_lock_bh(&serv->sv_cb_lock);
@@ -121,11 +127,13 @@ nfs41_callback_svc(void *vrqstp)
error);
} else {
spin_unlock_bh(&serv->sv_cb_lock);
- schedule();
+ if (!kthread_should_stop())
+ schedule();
finish_wait(&serv->sv_cb_waitq, &wq);
}
- flush_signals(current);
}
+ svc_exit_thread(rqstp);
+ module_put_and_exit(0);
return 0;
}
@@ -221,14 +229,14 @@ static int nfs_callback_up_net(int minorversion, struct svc_serv *serv,
static struct svc_serv_ops nfs40_cb_sv_ops = {
.svo_function = nfs4_callback_svc,
.svo_enqueue_xprt = svc_xprt_do_enqueue,
- .svo_setup = svc_set_num_threads,
+ .svo_setup = svc_set_num_threads_sync,
.svo_module = THIS_MODULE,
};
#if defined(CONFIG_NFS_V4_1)
static struct svc_serv_ops nfs41_cb_sv_ops = {
.svo_function = nfs41_callback_svc,
.svo_enqueue_xprt = svc_xprt_do_enqueue,
- .svo_setup = svc_set_num_threads,
+ .svo_setup = svc_set_num_threads_sync,
.svo_module = THIS_MODULE,
};