On Tue, 2017-03-07 at 17:22 +0800, Kinglong Mee wrote:
> The xprt for backchannel is created separately, not in TCP/UDP code.
> Because without the flags, the requests from NFSv41 backchannel are
> rejected in svc_process_common(),
>
> 1191 if (versp->vs_need_cong_ctrl &&
> 1192 !test_bit(XPT_CONG_CTRL, &rqstp->rq_xprt->xpt_flags))
> 1193 goto err_bad_vers;
>
> Fixes: 5283b03ee5 ("nfs/nfsd/sunrpc: enforce transport...")
> Signed-off-by: Kinglong Mee <kinglongmee@xxxxxxxxx>
> ---
> net/sunrpc/svcsock.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c
> index 8931e33..2b720fa 100644
> --- a/net/sunrpc/svcsock.c
> +++ b/net/sunrpc/svcsock.c
> @@ -1635,6 +1635,7 @@ static struct svc_xprt *svc_bc_create_socket(struct svc_serv *serv,
>
> xprt = &svsk->sk_xprt;
> svc_xprt_init(net, &svc_tcp_bc_class, xprt, serv);
> + set_bit(XPT_CONG_CTRL, &svsk->sk_xprt.xpt_flags);
>
> serv->sv_bc_xprt = xprt;
>
Good catch.
Reviewed-by: Jeff Layton <jlayton@xxxxxxxxxx>
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