ceph: wake up 'safe' waiters when unregistering request

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>

1 files changed, 2 insertions, 1 deletions

diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index 8ef79266d064..d90861f45210 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -644,6 +644,8 @@ 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);
 }
 
@@ -2186,7 +2188,6 @@ 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) {
                         /*