From 4690faf00cf838392ce038202a85ac0d5f1df598 Mon Sep 17 00:00:00 2001 From: Ilya Dryomov Date: Wed, 26 Jul 2017 09:59:15 +0200 Subject: [PATCH] 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: 98ad5ebd1505 ("libceph: ceph_connection_operations::reencode_message() method") Signed-off-by: Ilya Dryomov Reviewed-by: "Yan, Zheng" --- net/ceph/messenger.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c index b7cc615d42ef..a67298c7e0cd 100644 --- a/net/ceph/messenger.c +++ b/net/ceph/messenger.c @@ -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); + 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),