ceph: wake up 'safe' waiters when unregistering request

commit fc55d2c9448b34218ca58733a6f51fbede09575b upstream.

We also need to wake up 'safe' waiters if error occurs or request
aborted. Otherwise sync(2)/fsync(2) may hang forever.

Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
Signed-off-by: Sage Weil <sage@inktank.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index 0af8e29..1ce14c1 100644 (file)
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -639,6 +639,8 @@ static void __unregister_request(struct ceph_mds_client *mdsc,
                req->r_unsafe_dir = NULL;
        }
 
+       complete_all(&req->r_safe_completion);
+
        ceph_mdsc_put_request(req);
 }
 
@@ -2154,7 +2156,6 @@ static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
        if (head->safe) {
                req->r_got_safe = true;
                __unregister_request(mdsc, req);
-               complete_all(&req->r_safe_completion);
 
                if (req->r_got_unsafe) {
                        /*