From: Yan, Zheng <zyan@redhat.com>
Date: Fri, 5 May 2017 10:47:37 +0000 (+0800)
Subject: libceph: cleanup old messages according to reconnect seq
X-Git-Tag: MMI-PSA29.97-13-9~5534^2~1
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=0a2ad541071f99eaf4589c3551176fca191c1ee2;p=GitHub%2FMotorolaMobilityLLC%2Fkernel-slsi.git

libceph: cleanup old messages according to reconnect seq

when reopen a connection, use 'reconnect seq' to clean up
messages that have already been received by peer.

Link: http://tracker.ceph.com/issues/18690
Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
Reviewed-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
---

diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c
index d7ab481b2508..588a91930051 100644
--- a/net/ceph/messenger.c
+++ b/net/ceph/messenger.c
@@ -2228,10 +2228,18 @@ static void process_ack(struct ceph_connection *con)
 	struct ceph_msg *m;
 	u64 ack = le64_to_cpu(con->in_temp_ack);
 	u64 seq;
+	bool reconnect = (con->in_tag == CEPH_MSGR_TAG_SEQ);
+	struct list_head *list = reconnect ? &con->out_queue : &con->out_sent;
 
-	while (!list_empty(&con->out_sent)) {
-		m = list_first_entry(&con->out_sent, struct ceph_msg,
-				     list_head);
+	/*
+	 * In the reconnect case, con_fault() has requeued messages
+	 * in out_sent. We should cleanup old messages according to
+	 * the reconnect seq.
+	 */
+	while (!list_empty(list)) {
+		m = list_first_entry(list, struct ceph_msg, list_head);
+		if (reconnect && m->needs_out_seq)
+			break;
 		seq = le64_to_cpu(m->hdr.seq);
 		if (seq > ack)
 			break;
@@ -2240,6 +2248,7 @@ static void process_ack(struct ceph_connection *con)
 		m->ack_stamp = jiffies;
 		ceph_msg_remove(m);
 	}
+
 	prepare_read_tag(con);
 }