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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 <pthread.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. */
pthread_mutex_t 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
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