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svc: Add xpo_prep_reply_hdr

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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 <tom@opengridcomputing.com>
Acked-by: Neil Brown <neilb@suse.de>
Reviewed-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Greg Banks <gnb@sgi.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
This commit is contained in:
Tom Tucker 2007-12-30 21:07:29 -06:00 committed by J. Bruce Fields
parent 755cceaba7
commit e831fe65b1
3 changed files with 21 additions and 3 deletions
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1
include/linux/sunrpc/svc_xprt.h
View file

@ -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 *);

6
net/sunrpc/svc.c
View file

@ -840,9 +840,9 @@ 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);

17
net/sunrpc/svcsock.c
View file

@ -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 = {