From: Tom Tucker Subject: [RFC,PATCH 08/38] svc: Add xpo_prep_reply_hdr Date: Thu, 29 Nov 2007 16:40:10 -0600 Message-ID: <20071129224010.14563.11421.stgit@dell3.ogc.int> References: <20071129223917.14563.77633.stgit@dell3.ogc.int> Content-Type: text/plain; charset=utf-8; format=fixed Cc: linux-nfs@vger.kernel.org To: bfields-ag9A2Eb6PFsgsBAKwltoeQ@public.gmane.org Return-path: Received: from 209-198-142-2-host.prismnet.net ([209.198.142.2]:48887 "EHLO smtp.opengridcomputing.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933935AbXK2XDd (ORCPT ); Thu, 29 Nov 2007 18:03:33 -0500 In-Reply-To: <20071129223917.14563.77633.stgit-gUwIgmpLGaKNDNWfRnPdfg@public.gmane.org> Sender: linux-nfs-owner@vger.kernel.org List-ID: Some transports add fields to the RPC header for replies, e.g. the TCP record length. This function is called when preparing the reply header to allow each transport to add whatever fields it requires. Signed-off-by: Tom Tucker --- include/linux/sunrpc/svc_xprt.h | 1 + net/sunrpc/svc.c | 6 +++--- net/sunrpc/svcsock.c | 17 +++++++++++++++++ 3 files changed, 21 insertions(+), 3 deletions(-) diff --git a/include/linux/sunrpc/svc_xprt.h b/include/linux/sunrpc/svc_xprt.h index 5d7b2a6..8501115 100644 --- a/include/linux/sunrpc/svc_xprt.h +++ b/include/linux/sunrpc/svc_xprt.h @@ -11,6 +11,7 @@ struct svc_xprt_ops { int (*xpo_recvfrom)(struct svc_rqst *); + void (*xpo_prep_reply_hdr)(struct svc_rqst *); int (*xpo_sendto)(struct svc_rqst *); void (*xpo_release_rqst)(struct svc_rqst *); void (*xpo_detach)(struct svc_xprt *); diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c index ce59044..4e084a2 100644 --- a/net/sunrpc/svc.c +++ b/net/sunrpc/svc.c @@ -839,9 +839,9 @@ svc_process(struct svc_rqst *rqstp) rqstp->rq_res.tail[0].iov_len = 0; /* Will be turned off only in gss privacy case: */ rqstp->rq_splice_ok = 1; - /* tcp needs a space for the record length... */ - if (rqstp->rq_prot == IPPROTO_TCP) - svc_putnl(resv, 0); + + /* Setup reply header */ + rqstp->rq_xprt->xpt_ops->xpo_prep_reply_hdr(rqstp); rqstp->rq_xid = svc_getu32(argv); svc_putu32(resv, rqstp->rq_xid); diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c index 478fa33..510ad45 100644 --- a/net/sunrpc/svcsock.c +++ b/net/sunrpc/svcsock.c @@ -893,12 +893,17 @@ svc_udp_sendto(struct svc_rqst *rqstp) return error; } +static void svc_udp_prep_reply_hdr(struct svc_rqst *rqstp) +{ +} + static struct svc_xprt_ops svc_udp_ops = { .xpo_recvfrom = svc_udp_recvfrom, .xpo_sendto = svc_udp_sendto, .xpo_release_rqst = svc_release_skb, .xpo_detach = svc_sock_detach, .xpo_free = svc_sock_free, + .xpo_prep_reply_hdr = svc_udp_prep_reply_hdr, }; static struct svc_xprt_class svc_udp_class = { @@ -1350,12 +1355,24 @@ svc_tcp_sendto(struct svc_rqst *rqstp) return sent; } +/* + * Setup response header. TCP has a 4B record length field. + */ +static void svc_tcp_prep_reply_hdr(struct svc_rqst *rqstp) +{ + struct kvec *resv = &rqstp->rq_res.head[0]; + + /* tcp needs a space for the record length... */ + svc_putnl(resv, 0); +} + static struct svc_xprt_ops svc_tcp_ops = { .xpo_recvfrom = svc_tcp_recvfrom, .xpo_sendto = svc_tcp_sendto, .xpo_release_rqst = svc_release_skb, .xpo_detach = svc_sock_detach, .xpo_free = svc_sock_free, + .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr, }; static struct svc_xprt_class svc_tcp_class = {