[PATCH v2 03/19] xprtrdma: Replace use of xdr_stream_pos in rpcrdma_marshal_req

[Chuck Lever <chuck.lever@oracle.com>]

This is a latent bug. xdr_stream_pos works by subtracting
xdr_stream::nwords from xdr_buf::len. But xdr_stream::nwords is not
initialized by xdr_init_encode().

It works today only because all fields in rpcrdma_req::rl_stream
are initialized to zero by rpcrdma_req_create, making the
subtraction in xdr_stream_pos always a no-op.

I found this issue via code inspection. It was introduced by commit
39f4cd9e9982 ("xprtrdma: Harden chunk list encoding against send
buffer overflow"), but the code has changed enough since then that
this fix can't be automatically applied to stable.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
---
 include/trace/events/rpcrdma.h |    9 +++++----
 net/sunrpc/xprtrdma/rpc_rdma.c |    6 +++---
 2 files changed, 8 insertions(+), 7 deletions(-)

diff --git a/include/trace/events/rpcrdma.h b/include/trace/events/rpcrdma.h
index f0678e3..59492a93 100644
--- a/include/trace/events/rpcrdma.h
+++ b/include/trace/events/rpcrdma.h
@@ -470,13 +470,12 @@
 
 TRACE_EVENT(xprtrdma_marshal,
 	TP_PROTO(
-		const struct rpc_rqst *rqst,
-		unsigned int hdrlen,
+		const struct rpcrdma_req *req,
 		unsigned int rtype,
 		unsigned int wtype
 	),
 
-	TP_ARGS(rqst, hdrlen, rtype, wtype),
+	TP_ARGS(req, rtype, wtype),
 
 	TP_STRUCT__entry(
 		__field(unsigned int, task_id)
@@ -491,10 +490,12 @@
 	),
 
 	TP_fast_assign(
+		const struct rpc_rqst *rqst = &req->rl_slot;
+
 		__entry->task_id = rqst->rq_task->tk_pid;
 		__entry->client_id = rqst->rq_task->tk_client->cl_clid;
 		__entry->xid = be32_to_cpu(rqst->rq_xid);
-		__entry->hdrlen = hdrlen;
+		__entry->hdrlen = req->rl_hdrbuf.len;
 		__entry->headlen = rqst->rq_snd_buf.head[0].iov_len;
 		__entry->pagelen = rqst->rq_snd_buf.page_len;
 		__entry->taillen = rqst->rq_snd_buf.tail[0].iov_len;
diff --git a/net/sunrpc/xprtrdma/rpc_rdma.c b/net/sunrpc/xprtrdma/rpc_rdma.c
index 85115a2..97bfb80 100644
--- a/net/sunrpc/xprtrdma/rpc_rdma.c
+++ b/net/sunrpc/xprtrdma/rpc_rdma.c
@@ -867,12 +867,12 @@ static bool rpcrdma_prepare_msg_sges(struct rpcrdma_xprt *r_xprt,
 	if (ret)
 		goto out_err;
 
-	trace_xprtrdma_marshal(rqst, xdr_stream_pos(xdr), rtype, wtype);
-
-	ret = rpcrdma_prepare_send_sges(r_xprt, req, xdr_stream_pos(xdr),
+	ret = rpcrdma_prepare_send_sges(r_xprt, req, req->rl_hdrbuf.len,
 					&rqst->rq_snd_buf, rtype);
 	if (ret)
 		goto out_err;
+
+	trace_xprtrdma_marshal(req, rtype, wtype);
 	return 0;
 
 out_err: