[PATCH] knfsd: SUNRPC: Use sockaddr_storage to store address in svc_deferred_req

Sockaddr_storage will allow us to store arbitrary socket addresses in the
svc_deferred_req struct.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Cc: Aurelien Charbon <aurelien.charbon@ext.bull.net>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/sunrpc/svc.h

@@ -292,8 +292,9 @@ static inline void svc_free_res_pages(struct svc_rqst *rqstp)
 
 struct svc_deferred_req {
 	u32			prot;	/* protocol (UDP or TCP) */
-	struct sockaddr_in	addr;
-	struct svc_sock		*svsk;	/* where reply must go */
+	struct svc_sock		*svsk;
+	struct sockaddr_storage	addr;	/* where reply must go */
+	size_t			addrlen;
 	__be32			daddr;	/* where reply must come from */
 	struct cache_deferred_req handle;
 	int			argslen;

net/sunrpc/svcsock.c

@@ -1785,7 +1785,8 @@ svc_defer(struct cache_req *req)
 
 		dr->handle.owner = rqstp->rq_server;
 		dr->prot = rqstp->rq_prot;
-		dr->addr = rqstp->rq_addr;
+		memcpy(&dr->addr, &rqstp->rq_addr, rqstp->rq_addrlen);
+		dr->addrlen = rqstp->rq_addrlen;
 		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);
@@ -1809,7 +1810,8 @@ static int svc_deferred_recv(struct svc_rqst *rqstp)
 	rqstp->rq_arg.page_len = 0;
 	rqstp->rq_arg.len = dr->argslen<<2;
 	rqstp->rq_prot        = dr->prot;
-	rqstp->rq_addr        = dr->addr;
+	memcpy(&rqstp->rq_addr, &dr->addr, dr->addrlen);
+	rqstp->rq_addrlen     = dr->addrlen;
 	rqstp->rq_daddr       = dr->daddr;
 	rqstp->rq_respages    = rqstp->rq_pages;
 	return dr->argslen<<2;