From: Yan, Zheng <zheng.z.yan@intel.com>
Date: Thu, 31 Oct 2013 01:10:47 +0000 (+0800)
Subject: ceph: wake up 'safe' waiters when unregistering request
X-Git-Tag: v3.12.7~150
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=b419588352e9a826082d7784dd3398c490314eab;p=thirdparty%2Fkernel%2Fstable.git

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 91214b2054da0..788901552eb1c 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -642,6 +642,8 @@ 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);
 }
 
@@ -2189,7 +2191,6 @@ 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) {
 			/*