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/* Multiplexing filesystems by user
Copyright (C) 1997, 2000 Free Software Foundation, Inc.
Written by Miles Bader <miles@gnu.ai.mit.edu>
This file is part of the GNU Hurd.
The GNU Hurd 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, or (at
your option) any later version.
The GNU Hurd 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, USA. */
#ifndef __USERMUX_H__
#define __USERMUX_H__
#include <hurd/netfs.h>
#include <pthread.h>
#include <maptime.h>
struct passwd;
/* Filenos (aka inode numbers) for user nodes are the uid + this. */
#define USERMUX_FILENO_UID_OFFSET 10
/* Handy source of time. */
extern volatile struct mapped_time_value *usermux_maptime;
/* The state associated with a user multiplexer translator. */
struct usermux
{
/* The user nodes in this mux. */
struct usermux_name *names;
pthread_rwlock_t names_lock;
/* A template argz, which is used to start each user-specific translator
with the user name appropriately added. */
char *trans_template;
size_t trans_template_len;
/* What string to replace in TRANS_TEMPLATE with the name of the various
user params; if none occur in the template, the user's home dir is
appended as an additional argument. */
char *user_pat; /* User name */
char *home_pat; /* Home directory */
char *uid_pat; /* Numeric user id */
/* Constant fields for user stat entries. */
struct stat stat_template;
/* The file that this translator is sitting on top of; we inherit various
characteristics from it. */
file_t underlying;
};
/* The name of a recently looked up user entry. */
struct usermux_name
{
const char *name; /* Looked up name. */
/* A filesystem node associated with NAME. */
struct node *node;
struct usermux_name *next;
};
/* The fs specific storage that libnetfs associates with each filesystem
node. */
struct netnode
{
/* The mux this node belongs to (the node can either be the mux root, or
one of the users served by it). */
struct usermux *mux;
/* For mux nodes, 0, and for leaf nodes, the name under which the node was
looked up. */
struct usermux_name *name;
/* The translator associated with node, or if its a symlink, just the link
target. */
char *trans;
size_t trans_len;
};
error_t create_user_node (struct usermux *mux, struct usermux_name *name,
struct passwd *pw, struct node **node);
#ifndef USERMUX_EI
# define USERMUX_EI extern inline
#endif
#endif /* __USERMUX_H__ */
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