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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: 98ad5ebd15 ("libceph: ceph_connection_operations::reencode_message() method")
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: "Yan, Zheng" <zyan@redhat.com>
This commit is contained in:
Ilya Dryomov 2017-07-26 09:59:15 +02:00
parent 986e89898a
commit 4690faf00c
1 changed files with 3 additions and 3 deletions
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2
net/ceph/messenger.c
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@ -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),