Here's a patch we added to SLES in response to a customer bug report:
# Subject: Fill in rqstp->rq_daddr in svc_tcp_recvfrom
#
# This patch fills the daddr member of the rpc struct svc_rqst structure for
# TCP-based sockets in the recvfrom proceedure. Currently, the field is
# not set thus leaving it with left over garbage from a previous allocation.
#
# This makes the behavior consistent between UDP- and TCP-based RPC.
#
# This patch enables HA software to failover TCP-based RPC services
# such as TCP-based NFS.
#
# Signed-off-by: [email protected]
Index: linux-2.6.12.orig/net/sunrpc/svcsock.c
===================================================================
--- linux-2.6.12.orig/net/sunrpc/svcsock.c 2005-07-08 11:45:25.000000000 +0200
+++ linux-2.6.12/net/sunrpc/svcsock.c 2005-07-12 10:57:05.000000000 +0200
@@ -455,8 +455,9 @@ svc_recvfrom(struct svc_rqst *rqstp, str
struct socket *sock;
int len, alen;
- rqstp->rq_addrlen = sizeof(rqstp->rq_addr);
sock = rqstp->rq_sock->sk_sock;
+ rqstp->rq_daddr = inet_sk((const struct sock *)sock)->rcv_saddr;
+ rqstp->rq_addrlen = sizeof(rqstp->rq_addr);
msg.msg_name = &rqstp->rq_addr;
msg.msg_namelen = sizeof(rqstp->rq_addr);
--
Olaf Kirch | --- o --- Nous sommes du soleil we love when we play
[email protected] | / | \ sol.dhoop.naytheet.ah kin.ir.samse.qurax
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On Tue, Jul 12, 2005 at 11:04:56AM +0200, Olaf Kirch wrote:
> Here's a patch we added to SLES in response to a customer bug report:
>
> # Subject: Fill in rqstp->rq_daddr in svc_tcp_recvfrom
> #
> # This patch fills the daddr member of the rpc struct svc_rqst structure for
> # TCP-based sockets in the recvfrom proceedure. Currently, the field is
> # not set thus leaving it with left over garbage from a previous allocation.
> #
> # This makes the behavior consistent between UDP- and TCP-based RPC.
> #
> # This patch enables HA software to failover TCP-based RPC services
> # such as TCP-based NFS.
Could you explain how this patch makes a difference? I can only see the
value of rq_daddr used in one place, in svc_sendto:
if (rqstp->rq_prot == IPPROTO_UDP) {
...
pki->ipi_spec_dst.s_addr = rqstp->rq_daddr;
if (sock_sendmsg(sock, &msg, 0) < 0)
goto out;
}
So it doesn't seem to be used at all in the TCP case. Am I confused?
--b.
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Hi Bruce,
> Could you explain how this patch makes a difference? I can only see the
> value of rq_daddr used in one place, in svc_sendto:
It doesn't make a difference for the existing RPC users, but the customer
had some kernel RPC code of their own (I think some HA capable nfsd)
that needed this information for migration/failover.
It's not strictly necessary, but it doesn't hurt either - and it makes
sense in the way that UDP and TCP now fill in the same set of information.
Olaf
--
Olaf Kirch | --- o --- Nous sommes du soleil we love when we play
[email protected] | / | \ sol.dhoop.naytheet.ah kin.ir.samse.qurax
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On Wed, Jul 13, 2005 at 07:17:50AM +0200, Olaf Kirch wrote:
> Hi Bruce,
>
> > Could you explain how this patch makes a difference? I can only see the
> > value of rq_daddr used in one place, in svc_sendto:
>
> It doesn't make a difference for the existing RPC users, but the customer
> had some kernel RPC code of their own (I think some HA capable nfsd)
> that needed this information for migration/failover.
So let the customer post the patch, including the code that uses it,
as that might actually be useful for others aswell.
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