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/*---------------------------------------------------------------------------*/
/*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>
/*---------------------------------------------------------------------------*/
#include "lnode.h"
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
/*--------Macros-------------------------------------------------------------*/
/*Checks whether the give node is the root of the proxy 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*/
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
/*--------Types--------------------------------------------------------------*/
/*A list element containing a port*/
struct port_el
{
/*the port */
mach_port_t p;
/*the next element in the list */
struct port_el *next;
}; /*struct port_el */
/*---------------------------------------------------------------------------*/
typedef struct port_el port_el_t;
/*---------------------------------------------------------------------------*/
/*The user-defined node for libnetfs*/
struct netnode
{
/*the reference to the corresponding light node */
lnode_t *lnode;
/*the flags associated with this node */
int flags;
/*a port to the underlying filesystem */
file_t port;
/*the control port of the translator sitting on this node, in case
this node is a shadow node */
fsys_t trans_cntl;
/*the reference to the shadow node that is below the current shadow
node in the dynamic translator stack */
node_t * below;
/*the neighbouring entries in the cache */
node_t *ncache_prev, *ncache_next;
}; /*struct netnode */
/*---------------------------------------------------------------------------*/
typedef struct netnode netnode_t;
/*---------------------------------------------------------------------------*/
/*A list element containing directory entry*/
struct node_dirent
{
/*the directory entry */
struct dirent *dirent;
/*the next element */
struct node_dirent *next;
}; /*struct node_dirent */
/*---------------------------------------------------------------------------*/
typedef struct node_dirent node_dirent_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 (lnode_t * lnode, node_t ** node);
/*---------------------------------------------------------------------------*/
/*Derives a new proxy from `lnode`*/
error_t node_create_proxy (lnode_t * lnode, node_t ** node);
/*---------------------------------------------------------------------------*/
/*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);
/*---------------------------------------------------------------------------*/
/*Initializes the port to the underlying filesystem for the root node*/
error_t node_init_root (node_t * node);
/*---------------------------------------------------------------------------*/
/*Frees a list of dirents*/
void node_entries_free (node_dirent_t * dirents);
/*---------------------------------------------------------------------------*/
/*Reads the directory entries from `node`, which must be locked*/
error_t node_entries_get (node_t * node, node_dirent_t ** dirents);
/*---------------------------------------------------------------------------*/
/*Makes sure that all ports to the underlying filesystem of `node` are
up to date*/
error_t node_update (node_t * node);
/*---------------------------------------------------------------------------*/
/*Computes the size of the given directory*/
error_t node_get_size (node_t * dir, OFFSET_T * off);
/*---------------------------------------------------------------------------*/
/*Remove the file called `name` under `dir`*/
error_t node_unlink_file (node_t * dir, char *name);
/*---------------------------------------------------------------------------*/
/*Starts translator `trans` on the (shadow) node `np`, which should
mirror the file `filename`, and returns the port `port` to the root
of the translator opened as `flags.`*/
error_t
node_set_translator
(struct protid *diruser, node_t * np, char * trans, int flags,
char * filename, mach_port_t * port);
/*---------------------------------------------------------------------------*/
#endif /*__NODE_H__*/
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