Re: [PATCH] Fill in rqstp->rq_daddr in svc_tcp_recvfrom

["J. Bruce Fields" <bfields@fieldses.org>]

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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