[PATCH] svcrpc: save and restore the daddr field when request deferred

The server code currently keeps track of the destination address on every
request so that it can reply using the same address.  However we forget to do
that in the case of a deferred request.  Remedy this oversight.  >From folks
at PolyServe.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

include/linux/sunrpc/svc.h

@@ -246,6 +246,7 @@ struct svc_deferred_req {
 	u32			prot;	/* protocol (UDP or TCP) */
 	struct sockaddr_in	addr;
 	struct svc_sock		*svsk;	/* where reply must go */
+	u32			daddr;	/* where reply must come from */
 	struct cache_deferred_req handle;
 	int			argslen;
 	u32			args[0];

net/sunrpc/svcsock.c

@@ -1527,6 +1527,7 @@ svc_defer(struct cache_req *req)
 		dr->handle.owner = rqstp->rq_server;
 		dr->prot = rqstp->rq_prot;
 		dr->addr = rqstp->rq_addr;
+		dr->daddr = rqstp->rq_daddr;
 		dr->argslen = rqstp->rq_arg.len >> 2;
 		memcpy(dr->args, rqstp->rq_arg.head[0].iov_base-skip, dr->argslen<<2);
 	}
@@ -1552,6 +1553,7 @@ static int svc_deferred_recv(struct svc_rqst *rqstp)
 	rqstp->rq_arg.len = dr->argslen<<2;
 	rqstp->rq_prot        = dr->prot;
 	rqstp->rq_addr        = dr->addr;
+	rqstp->rq_daddr       = dr->daddr;
 	return dr->argslen<<2;
 }