Created the most basic one-node libnetfs-based stackable translator.

The filter is going to be an ordinary translator in most
regards, save for its attitude towards the translators
sitting on the real filesystem node associated with the
mirror on which the filter is sitting (see README).

1 files changed, 114 insertions, 0 deletions

diff --git a/node.h b/node.h
new file mode 100644
index 000000000..c8c8945c7
--- /dev/null
+++ b/node.h
@@ -0,0 +1,114 @@
+/*----------------------------------------------------------------------------*/
+/*node.h*/
+/*----------------------------------------------------------------------------*/
+/*Node management. Also see lnode.h*/
+/*----------------------------------------------------------------------------*/
+/*Based on the code of unionfs translator.*/
+/*----------------------------------------------------------------------------*/
+/*Copyright (C) 2001, 2002, 2005, 2008 Free Software Foundation, Inc.
+  Written by Sergiu Ivanov <unlimitedscolobb@gmail.com>.
+
+  This program is free software; you can redistribute it and/or
+  modify it under the terms of the GNU General Public License as
+  published by the Free Software Foundation; either version 2 of the
+  License, or * (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+  USA.*/
+/*----------------------------------------------------------------------------*/
+#ifndef __NODE_H__
+#define __NODE_H__
+
+/*----------------------------------------------------------------------------*/
+#include <error.h>
+#include <sys/stat.h>
+#include <hurd/netfs.h>
+/*----------------------------------------------------------------------------*/
+
+/*----------------------------------------------------------------------------*/
+/*--------Macros--------------------------------------------------------------*/
+/*Checks whether the give node is the root of the filterfs filesystem*/
+#define NODE_IS_ROOT(n) (((n)->nn->lnode->dir) ? (0) : (1))
+/*----------------------------------------------------------------------------*/
+/*Node flags*/
+#define FLAG_NODE_ULFS_FIXED 		0x00000001	/*this node should not be updated*/
+#define FLAG_NODE_INVALIDATE		0x00000002 	/*this node must be updated*/
+#define FLAG_NODE_ULFS_UPTODATE	0x00000004 	/*this node has just been updated*/
+/*----------------------------------------------------------------------------*/
+/*The type of offset corresponding to the current platform*/
+#ifdef __USE_FILE_OFFSET64
+#	define OFFSET_T __off64_t
+#else
+#	define OFFSET_T __off_t
+#endif /*__USE_FILE_OFFSET64*/
+/*----------------------------------------------------------------------------*/
+/*The size of a chunk of a string (for a small optimization in checking
+	the property)*/
+#define STRING_CHUNK 256
+/*----------------------------------------------------------------------------*/
+/*Deallocates the specified port*/
+#define PORT_DEALLOC(p) (mach_port_deallocate(mach_task_self(), (p)))
+/*----------------------------------------------------------------------------*/
+
+/*----------------------------------------------------------------------------*/
+/*The user-defined node for libnetfs*/
+struct netnode
+	{
+	/*the flags associated with this node (might be not required)*/
+	int flags;
+
+	/*a port to the underlying filesystem*/
+	file_t port;
+	};/*struct netnode*/
+/*----------------------------------------------------------------------------*/
+typedef struct netnode netnode_t;
+/*----------------------------------------------------------------------------*/
+typedef struct node node_t;
+/*----------------------------------------------------------------------------*/
+
+/*----------------------------------------------------------------------------*/
+/*--------Global Variables----------------------------------------------------*/
+/*The lock protecting the underlying filesystem*/
+extern struct mutex ulfs_lock;
+/*----------------------------------------------------------------------------*/
+
+/*----------------------------------------------------------------------------*/
+/*--------Functions-----------------------------------------------------------*/
+/*Derives a new node from `lnode` and adds a reference to `lnode`*/
+error_t
+node_create
+	(
+	node_t ** node	/*store the result here*/
+	);
+/*----------------------------------------------------------------------------*/
+/*Destroys the specified node and removes a light reference from the
+	associated light node*/
+void
+node_destroy
+	(
+	node_t * np
+	);
+/*----------------------------------------------------------------------------*/
+/*Creates the root node and the corresponding lnode*/
+error_t
+node_create_root
+	(
+	node_t ** root_node	/*store the result here*/
+	);
+/*----------------------------------------------------------------------------*/
+/*Initializes the port to the underlying filesystem for the root node*/
+error_t
+node_init_root
+	(
+	mach_port_t underlying,	/*the port to the underlying node*/
+	node_t * node						/*the root node*/
+	);
+/*----------------------------------------------------------------------------*/
+#endif /*__NODE_H__*/