Commit 4690faf0 authored Jul 26, 2017 by Ilya Dryomov

libceph: don't call ->reencode_message() more than once per message



Reencoding an already reencoded message is a bad idea.  This could
happen on Policy::stateful_server connections (!CEPH_MSG_CONNECT_LOSSY),
such as MDS sessions.

This didn't pop up in testing because currently only OSD requests are
reencoded and OSD sessions are always lossy.

Fixes: 98ad5ebd ("libceph: ceph_connection_operations::reencode_message() method")
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: "Yan, Zheng" <zyan@redhat.com>

parent 986e8989

net/ceph/messenger.c

+3 −3

Original line number	Diff line number	Diff line
		@@ -1287,10 +1287,10 @@ static void prepare_write_message(struct ceph_connection *con)
		if (m->needs_out_seq) {
		m->hdr.seq = cpu_to_le64(++con->out_seq);
		m->needs_out_seq = false;
		}

		if (con->ops->reencode_message)
		con->ops->reencode_message(m);
		}

		dout("prepare_write_message %p seq %lld type %d len %d+%d+%zd\n",
		m, con->out_seq, le16_to_cpu(m->hdr.type),