[PATCH 5.4 083/156] ceph: flush cap releases when the session is flushed

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From: Xiubo Li <xiubli@xxxxxxxxxx>

commit e7d84c6a1296d059389f7342d9b4b7defb518d3a upstream.

MDS expects the completed cap release prior to responding to the
session flush for cache drop.

Cc: stable@xxxxxxxxxxxxxxx
Link: http://tracker.ceph.com/issues/38009
Signed-off-by: Xiubo Li <xiubli@xxxxxxxxxx>
Reviewed-by: Venky Shankar <vshankar@xxxxxxxxxx>
Reviewed-by: Jeff Layton <jlayton@xxxxxxxxxx>
Signed-off-by: Ilya Dryomov <idryomov@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 fs/ceph/mds_client.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -3151,6 +3151,12 @@ static void handle_session(struct ceph_m
 		break;
 
 	case CEPH_SESSION_FLUSHMSG:
+		/* flush cap releases */
+		spin_lock(&session->s_cap_lock);
+		if (session->s_num_cap_releases)
+			ceph_flush_cap_releases(mdsc, session);
+		spin_unlock(&session->s_cap_lock);
+
 		send_flushmsg_ack(mdsc, session, seq);
 		break;
 





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