From 98f1d83194f8950965d2c6207f036f4749e17e57 Mon Sep 17 00:00:00 2001
From: Emery Hemingway <ehmry@posteo.net>
Date: Thu, 24 May 2018 09:40:57 +0200
Subject: [PATCH] Automatic session quota upgrades for RM connections

Fix #2838
---
 repos/base/include/rm_session/connection.h | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/repos/base/include/rm_session/connection.h b/repos/base/include/rm_session/connection.h
index 607740a87..78fc56748 100644
--- a/repos/base/include/rm_session/connection.h
+++ b/repos/base/include/rm_session/connection.h
@@ -5,7 +5,7 @@
  */
 
 /*
- * Copyright (C) 2008-2017 Genode Labs GmbH
+ * Copyright (C) 2008-2018 Genode Labs GmbH
  *
  * This file is part of the Genode OS framework, which is distributed
  * under the terms of the GNU Affero General Public License version 3.
@@ -16,6 +16,7 @@
 
 #include <rm_session/client.h>
 #include <base/connection.h>
+#include <util/retry.h>
 
 namespace Genode { struct Rm_connection; }
 
@@ -46,6 +47,25 @@ struct Genode::Rm_connection : Connection<Rm_session>, Rm_session_client
 		Connection<Rm_session>(session("ram_quota=%u, cap_quota=%u", RAM_QUOTA, CAP_QUOTA)),
 		Rm_session_client(cap())
 	{ }
+
+	/**
+	 * Wrapper over 'create' that handles resource requests
+	 * from the server.
+	 */
+	Capability<Region_map> create(size_t size) override
+	{
+		enum { UPGRADE_ATTEMPTS = 16U };
+
+		return Genode::retry<Out_of_ram>(
+			[&] () {
+				return Genode::retry<Out_of_caps>(
+					[&] () { return Rm_session_client::create(size); },
+					[&] () { upgrade_caps(2); },
+					UPGRADE_ATTEMPTS);
+			},
+			[&] () { upgrade_ram(8*1024); },
+			UPGRADE_ATTEMPTS);
+	}
 };
 
 #endif /* _INCLUDE__RM_SESSION__CONNECTION_H_ */