NSM: Use sockaddr_storage for sm_addr field

To store larger addresses in the nsm_handle structure, make sm_addr a
sockaddr_storage.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>

fs/lockd/host.c

@@ -551,7 +551,7 @@ __nsm_find(const struct sockaddr_in *sin,
 			if (strlen(pos->sm_name) != hostname_len
 			 || memcmp(pos->sm_name, hostname, hostname_len))
 				continue;
-		} else if (!nlm_cmp_addr(&pos->sm_addr, sin))
+		} else if (!nlm_cmp_addr(nsm_addr_in(pos), sin))
 			continue;
 		atomic_inc(&pos->sm_count);
 		kfree(nsm);
@@ -571,7 +571,8 @@ __nsm_find(const struct sockaddr_in *sin,
 	if (nsm == NULL)
 		return NULL;
 
-	nsm->sm_addr = *sin;
+	memcpy(nsm_addr(nsm), sin, sizeof(*sin));
+	nsm->sm_addrlen = sizeof(*sin);
 	nsm->sm_name = (char *) (nsm + 1);
 	memcpy(nsm->sm_name, hostname, hostname_len);
 	nsm->sm_name[hostname_len] = '\0';

fs/lockd/mon.c

@@ -51,7 +51,7 @@ nsm_mon_unmon(struct nsm_handle *nsm, u32 proc, struct nsm_res *res)
 
 	memset(&args, 0, sizeof(args));
 	args.mon_name = nsm->sm_name;
-	args.addr = nsm->sm_addr.sin_addr.s_addr;
+	args.addr = nsm_addr_in(nsm)->sin_addr.s_addr;
 	args.prog = NLM_PROGRAM;
 	args.vers = 3;
 	args.proc = NLMPROC_NSM_NOTIFY;

include/linux/lockd/lockd.h

@@ -71,7 +71,8 @@ struct nsm_handle {
 	struct list_head	sm_link;
 	atomic_t		sm_count;
 	char *			sm_name;
-	struct sockaddr_in	sm_addr;
+	struct sockaddr_storage	sm_addr;
+	size_t			sm_addrlen;
 	unsigned int		sm_monitored : 1,
 				sm_sticky : 1;	/* don't unmonitor */
 	char			sm_addrbuf[48];	/* address eyecatcher */
@@ -100,6 +101,16 @@ static inline struct sockaddr *nlm_srcaddr(const struct nlm_host *host)
 	return (struct sockaddr *)&host->h_srcaddr;
 }
 
+static inline struct sockaddr_in *nsm_addr_in(const struct nsm_handle *handle)
+{
+	return (struct sockaddr_in *)&handle->sm_addr;
+}
+
+static inline struct sockaddr *nsm_addr(const struct nsm_handle *handle)
+{
+	return (struct sockaddr *)&handle->sm_addr;
+}
+
 /*
  * Map an fl_owner_t into a unique 32-bit "pid"
  */