libceph: print more info for short message header

If an osd client response message arrives that has a front section
that's too big for the buffer set aside to receive it, a warning
gets reported and a new buffer is allocated.

The warning says nothing about which connection had the problem.
Add the peer type and number to what gets reported, to be a bit more
informative.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>

net/ceph/osd_client.c

diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c
index e0abb83..61147fe 100644
--- a/net/ceph/osd_client.c
+++ b/net/ceph/osd_client.c
@@ -2454,8 +2454,10 @@
 	ceph_msg_revoke_incoming(req->r_reply);
 
 	if (front > req->r_reply->front.iov_len) {
-		pr_warning("get_reply front %d > preallocated %d\n",
-			   front, (int)req->r_reply->front.iov_len);
+		pr_warning("get_reply front %d > preallocated %d (%u#%llu)\n",
+			   front, (int)req->r_reply->front.iov_len,
+			   (unsigned int)con->peer_name.type,
+			   le64_to_cpu(con->peer_name.num));
 		m = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, front, GFP_NOFS, false);
 		if (!m)
 			goto out;