rpc_gssd_dummy_populate(): don't bother with rpc_populate()

Just have it create gssd (in root), clntXX in gssd, then info and gssd in clntXX
- all with explicit rpc_new_dir()/rpc_new_file()/rpc_mkpipe_dentry().

Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

Author: Al Viro

net/sunrpc/rpc_pipe.c

@@ -997,7 +997,6 @@ enum {
 	RPCAUTH_nfsd4_cb,
 	RPCAUTH_cache,
 	RPCAUTH_nfsd,
-	RPCAUTH_gssd,
 	RPCAUTH_RootEOF
 };
 
@@ -1034,10 +1033,6 @@ static const struct rpc_filelist files[] = {
 		.name = "nfsd",
 		.mode = S_IFDIR | 0555,
 	},
-	[RPCAUTH_gssd] = {
-		.name = "gssd",
-		.mode = S_IFDIR | 0555,
-	},
 };
 
 /*
@@ -1097,13 +1092,6 @@ void rpc_put_sb_net(const struct net *net)
 }
 EXPORT_SYMBOL_GPL(rpc_put_sb_net);
 
-static const struct rpc_filelist gssd_dummy_clnt_dir[] = {
-	[0] = {
-		.name = "clntXX",
-		.mode = S_IFDIR | 0555,
-	},
-};
-
 static ssize_t
 dummy_downcall(struct file *filp, const char __user *src, size_t len)
 {
@@ -1132,14 +1120,6 @@ rpc_dummy_info_show(struct seq_file *m, void *v)
 }
 DEFINE_SHOW_ATTRIBUTE(rpc_dummy_info);
 
-static const struct rpc_filelist gssd_dummy_info_file[] = {
-	[0] = {
-		.name = "info",
-		.i_fop = &rpc_dummy_info_fops,
-		.mode = S_IFREG | 0400,
-	},
-};
-
 /**
  * rpc_gssd_dummy_populate - create a dummy gssd pipe
  * @root:	root of the rpc_pipefs filesystem
@@ -1151,35 +1131,22 @@ static const struct rpc_filelist gssd_dummy_info_file[] = {
 static int
 rpc_gssd_dummy_populate(struct dentry *root, struct rpc_pipe *pipe_data)
 {
-	int ret = 0;
-	struct dentry *gssd_dentry;
-	struct dentry *clnt_dentry = NULL;
+	struct dentry *gssd_dentry, *clnt_dentry;
+	int err;
 
-	/* We should never get this far if "gssd" doesn't exist */
-	gssd_dentry = try_lookup_noperm(&QSTR(files[RPCAUTH_gssd].name), root);
-	if (!gssd_dentry)
+	gssd_dentry = rpc_new_dir(root, "gssd", 0555, NULL);
+	if (IS_ERR(gssd_dentry))
 		return -ENOENT;
 
-	ret = rpc_populate(gssd_dentry, gssd_dummy_clnt_dir, 0, 1, NULL);
-	if (ret) {
-		dput(gssd_dentry);
-		return ret;
-	}
-
-	clnt_dentry = try_lookup_noperm(&QSTR(gssd_dummy_clnt_dir[0].name),
-					  gssd_dentry);
-	dput(gssd_dentry);
-	if (!clnt_dentry)
+	clnt_dentry = rpc_new_dir(gssd_dentry, "clntXX", 0555, NULL);
+	if (IS_ERR(clnt_dentry))
 		return -ENOENT;
 
-	ret = rpc_populate(clnt_dentry, gssd_dummy_info_file, 0, 1, NULL);
-	if (ret) {
-		dput(clnt_dentry);
-		return ret;
-	}
-	ret = rpc_mkpipe_dentry(clnt_dentry, "gssd", NULL, pipe_data);
-	dput(clnt_dentry);
-	return ret;
+	err = rpc_new_file(clnt_dentry, "info", 0400,
+				   &rpc_dummy_info_fops, NULL);
+	if (!err)
+		err = rpc_mkpipe_dentry(clnt_dentry, "gssd", NULL, pipe_data);
+	return err;
 }
 
 static int