NFSv4: Use the correct net namespace in nfs4_update_server

We need to use the same net namespace that was used to resolve
the hostname and sockaddr arguments.

Fixes: 32e62b7c (NFS: Add nfs4_update_server)
Cc: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>

fs/nfs/internal.h

@@ -176,7 +176,8 @@ extern struct nfs_server *nfs4_create_server(
 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
 						      struct nfs_fh *);
 extern int nfs4_update_server(struct nfs_server *server, const char *hostname,
-					struct sockaddr *sap, size_t salen);
+					struct sockaddr *sap, size_t salen,
+					struct net *net);
 extern void nfs_free_server(struct nfs_server *server);
 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
 					   struct nfs_fh *,

fs/nfs/nfs4client.c

@@ -1135,6 +1135,7 @@ static int nfs_probe_destination(struct nfs_server *server)
  * @hostname: new end-point's hostname
  * @sap: new end-point's socket address
  * @salen: size of "sap"
+ * @net: net namespace
  *
  * The nfs_server must be quiescent before this function is invoked.
  * Either its session is drained (NFSv4.1+), or its transport is
@@ -1143,13 +1144,13 @@ static int nfs_probe_destination(struct nfs_server *server)
  * Returns zero on success, or a negative errno value.
  */
 int nfs4_update_server(struct nfs_server *server, const char *hostname,
-		       struct sockaddr *sap, size_t salen)
+		       struct sockaddr *sap, size_t salen, struct net *net)
 {
 	struct nfs_client *clp = server->nfs_client;
 	struct rpc_clnt *clnt = server->client;
 	struct xprt_create xargs = {
 		.ident		= clp->cl_proto,
-		.net		= &init_net,
+		.net		= net,
 		.dstaddr	= sap,
 		.addrlen	= salen,
 		.servername	= hostname,
@@ -1189,7 +1190,7 @@ int nfs4_update_server(struct nfs_server *server, const char *hostname,
 	error = nfs4_set_client(server, hostname, sap, salen, buf,
 				clp->cl_rpcclient->cl_auth->au_flavor,
 				clp->cl_proto, clnt->cl_timeout,
-				clp->cl_minorversion, clp->cl_net);
+				clp->cl_minorversion, net);
 	nfs_put_client(clp);
 	if (error != 0) {
 		nfs_server_insert_lists(server);

fs/nfs/nfs4namespace.c

@@ -121,9 +121,8 @@ static int nfs4_validate_fspath(struct dentry *dentry,
 }
 
 static size_t nfs_parse_server_name(char *string, size_t len,
-		struct sockaddr *sa, size_t salen, struct nfs_server *server)
+		struct sockaddr *sa, size_t salen, struct net *net)
 {
-	struct net *net = rpc_net_ns(server->client);
 	ssize_t ret;
 
 	ret = rpc_pton(net, string, len, sa, salen);
@@ -223,6 +222,7 @@ static struct vfsmount *try_location(struct nfs_clone_mount *mountdata,
 				     const struct nfs4_fs_location *location)
 {
 	const size_t addr_bufsize = sizeof(struct sockaddr_storage);
+	struct net *net = rpc_net_ns(NFS_SB(mountdata->sb)->client);
 	struct vfsmount *mnt = ERR_PTR(-ENOENT);
 	char *mnt_path;
 	unsigned int maxbuflen;
@@ -248,8 +248,7 @@ static struct vfsmount *try_location(struct nfs_clone_mount *mountdata,
 			continue;
 
 		mountdata->addrlen = nfs_parse_server_name(buf->data, buf->len,
-				mountdata->addr, addr_bufsize,
-				NFS_SB(mountdata->sb));
+				mountdata->addr, addr_bufsize, net);
 		if (mountdata->addrlen == 0)
 			continue;
 
@@ -419,6 +418,7 @@ static int nfs4_try_replacing_one_location(struct nfs_server *server,
 		const struct nfs4_fs_location *location)
 {
 	const size_t addr_bufsize = sizeof(struct sockaddr_storage);
+	struct net *net = rpc_net_ns(server->client);
 	struct sockaddr *sap;
 	unsigned int s;
 	size_t salen;
@@ -440,7 +440,7 @@ static int nfs4_try_replacing_one_location(struct nfs_server *server,
 			continue;
 
 		salen = nfs_parse_server_name(buf->data, buf->len,
-						sap, addr_bufsize, server);
+						sap, addr_bufsize, net);
 		if (salen == 0)
 			continue;
 		rpc_set_port(sap, NFS_PORT);
@@ -450,7 +450,7 @@ static int nfs4_try_replacing_one_location(struct nfs_server *server,
 		if (hostname == NULL)
 			break;
 
-		error = nfs4_update_server(server, hostname, sap, salen);
+		error = nfs4_update_server(server, hostname, sap, salen, net);
 		kfree(hostname);
 		if (error == 0)
 			break;