Re: [PATCH] SUNRPC/backchanel: set XPT_CONG_CTRL flag for bc xprt

[Jeff Layton <jlayton@redhat.com>]

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@gmail.com>
> ---
>  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@redhat.com>