1 files changed, 77 insertions, 0 deletions
diff --git a/unionfs/lnode.h b/unionfs/lnode.h
new file mode 100644
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+++ b/unionfs/lnode.h
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+/* 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.  */
+
+/* `light node' management.  */
+
+#ifndef INCLUDED_LNODE_H
+#define INCLUDED_LNODE_H
+
+#include <hurd/netfs.h>
+#include <error.h>
+
+struct lnode
+{
+  char *name;			/* The name of this light node.  */
+  int name_len;			/* This is used quite often and since
+				   NAME does not change, just
+				   calculate it once.  */
+  int flags;			/* Associated flags.  */
+  int references;		/* References to this light node.  */
+  struct node *node;	        /* Reference to the real node.  */
+  struct lnode *next, **prevp;	/* Light nodes are connected in a
+				   linked list.  */
+  struct lnode *dir;		/* The light node this light node is
+				   contained int.  */
+  struct lnode *entries;	/* A reference to the list containing
+				   the entries of this light node.  */
+  struct mutex lock;		/* A lock.  */
+};
+typedef struct lnode lnode_t;
+
+/* Create a new light node as an entry with the name NAME and store it
+   in *NODE.  The new node is not locked and contains a single
+   reference.  */
+error_t lnode_create (char *name, lnode_t **node);
+
+/* Destroy a light node.  */
+void lnode_destroy (lnode_t *node);
+
+/* Install the node in the node tree; add a reference to DIR.  */
+void lnode_install (lnode_t *dir, lnode_t *node);
+
+/* Uninstall the node from the node tree; remove a reference from the
+   lnode containing NODE.  */
+void lnode_uninstall (lnode_t *node);
+
+/* Add a reference to NODE, which must be locked.  */
+void lnode_ref_add (lnode_t *node);
+
+/* Remove a reference to NODE, which must be locked.  If that was the
+   last reference, destroy the node, otherwise simply unlock NODE.  */
+void lnode_ref_remove (lnode_t *node);
+
+/* Get a light node by it's name.  The looked up node is locked and
+   got one reference added.  */
+error_t lnode_get (lnode_t *dir, char *name,
+		   lnode_t **node);
+
+/* Construct the full path for a given light node.  */
+error_t lnode_path_construct (lnode_t *node, char **path);
+
+#endif