This is my initial working version.

There is a bug in boot in this version: subhurd sometimes cannot boot.

1 files changed, 59 insertions, 0 deletions

diff --git a/unionfs/ncache.h b/unionfs/ncache.h
new file mode 100644
index 00000000..8fa7d107
--- /dev/null
+++ b/unionfs/ncache.h
@@ -0,0 +1,59 @@
+/* Hurd unionfs
+   Copyright (C) 2001, 2002 Free Software Foundation, Inc.
+   Written by Moritz Schulte <moritz@duesseldorf.ccc.de>.
+
+   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 INCLUDED_NCACHE_H
+#define INCLUDED_NCACHE_H
+
+#include <error.h>
+#include <hurd/netfs.h>
+
+#include "node.h"
+
+typedef struct ncache
+{
+  node_t *mru; 		        /* Reference to the mru end of the
+				   cache chain.  */
+  node_t *lru;		        /* Reference to the lru end of the
+				   cache chain.  */
+  int size_max;			/* Maximal number of nodes to
+				   cache.  */
+  int size_current;		/* Current number of nodes in the
+				   cache.  */
+  struct mutex lock;		/* A lock.  */
+} ncache_t;
+
+/* Cache size, may be overwritten by the user.  */
+extern int ncache_size;
+
+/* Initialize the node cache, set the maximum number of allowed nodes
+   in the cache to SIZE_MAX.  */
+void ncache_init (int size_max);
+
+/* Lookup the node for the light node LNODE.  If it does not exist
+   anymore in the cache, create a new node.  Store the looked up node
+   in *NODE.  */
+error_t ncache_node_lookup (lnode_t *lnode, node_t **node);
+
+void ncache_reset (void);
+
+/* Add the given node NODE to the node cache; remove
+   least-recently-used nodes, if needed.  */
+void ncache_node_add (node_t *node);
+
+#endif