Add READ_READY support to file-system session

The read-ready packet informs the server that the client wants to be
notified if a handle becomes readable. When becoming readable, the
server acknowledges packet and the client may queue a read requests
accordingly.

repos/dde_rump/src/server/rump_fs/main.cc

@@ -80,6 +80,10 @@ class File_system::Session_component : public Session_rpc_object
 			case Packet_descriptor::WRITE:
 				res_length = node.write((char const *)content, length, offset);
 				break;
+
+			case Packet_descriptor::READ_READY:
+				/* not supported */
+				break;
 			}
 
 			packet.length(res_length);

repos/libports/src/server/ffat_fs/main.cc

@@ -98,6 +98,10 @@ namespace File_system {
 					case Packet_descriptor::WRITE:
 						res_length = node.write((char const *)content, length, offset);
 						break;
+
+					case Packet_descriptor::READ_READY:
+						/* not supported */
+						break;
 				}
 
 				packet.length(res_length);

repos/libports/src/server/fuse_fs/fuse_fs_main.cc

@@ -86,6 +86,10 @@ class File_system::Session_component : public Session_rpc_object
 
 				res_length = node.write((char const *)content, length, offset);
 				break;
+
+			case Packet_descriptor::READ_READY:
+				/* not supported */
+				break;
 			}
 
 			packet.length(res_length);

repos/os/include/file_system_session/file_system_session.h

@@ -1,11 +1,13 @@
 /*
  * \brief  File-system session interface
  * \author Norman Feske
+ * \author Emery Hemingway
+ * \author Christian Helmuth
  * \date   2012-04-05
  */
 
 /*
- * Copyright (C) 2012-2016 Genode Labs GmbH
+ * Copyright (C) 2012-2017 Genode Labs GmbH
  *
  * This file is part of the Genode OS framework, which is distributed
  * under the terms of the GNU General Public License version 2.
@@ -117,7 +119,7 @@ class File_system::Packet_descriptor : public Genode::Packet_descriptor
 {
 	public:
 
-		enum Opcode { READ, WRITE };
+		enum Opcode { READ, WRITE, READ_READY };
 
 	private:
 

repos/os/src/server/lx_fs/main.cc

@@ -77,6 +77,10 @@ class File_system::Session_component : public Session_rpc_object
 			case Packet_descriptor::WRITE:
 				res_length = node.write((char const *)content, length, offset);
 				break;
+
+			case Packet_descriptor::READ_READY:
+				/* not supported */
+				break;
 			}
 
 			packet.length(res_length);

repos/os/src/server/ram_fs/main.cc

@@ -83,6 +83,10 @@ class File_system::Session_component : public Session_rpc_object
 			case Packet_descriptor::WRITE:
 				res_length = node.write((char const *)content, length, offset);
 				break;
+
+			case Packet_descriptor::READ_READY:
+				/* not supported */
+				break;
 			}
 
 			packet.length(res_length);

repos/os/src/server/trace_fs/main.cc

@@ -668,6 +668,10 @@ class File_system::Session_component : public Session_rpc_object
 			case Packet_descriptor::WRITE:
 				res_length = node.write((char const *)content, length, offset);
 				break;
+
+			case Packet_descriptor::READ_READY:
+				/* not supported */
+				break;
 			}
 
 			packet.length(res_length);

repos/os/src/server/vfs/main.cc

@@ -1,11 +1,12 @@
 /*
  * \brief  VFS File_system server
  * \author Emery Hemingway
+ * \author Christian Helmuth
  * \date   2015-08-16
  */
 
 /*
- * Copyright (C) 2015-2016 Genode Labs GmbH
+ * Copyright (C) 2015-2017 Genode Labs GmbH
  *
  * This file is part of the Genode OS framework, which is distributed
  * under the terms of the GNU General Public License version 2.
@@ -139,6 +140,10 @@ class Vfs_server::Session_component :
 						res_length = node.write(_vfs, (char const *)content, length, seek);
 				}); } catch (...) { }
 				break;
+
+			case Packet_descriptor::READ_READY:
+				/* not supported */
+				break;
 			}
 
 			packet.length(res_length);