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/* Multiplexing filesystems by host
Copyright (C) 1997 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 __HOSTMUX_H__
#define __HOSTMUX_H__
#include <hurd/netfs.h>
#include <rwlock.h>
#include <maptime.h>
/* Handy source of time. */
volatile struct mapped_time_value *hostmux_mapped_time;
/* The state associated with a host multiplexer translator. */
struct hostmux
{
/* The host hodes in this mux. */
struct hostmux_name *names;
struct rwlock names_lock;
/* The next inode number we'll use; protected by NAMES_LOCK. */
ino_t next_fileno;
/* A template argz, which is used to start each host-specific translator
with the host name appropriately added. */
char *trans_template;
size_t trans_template_len;
/* What string to replace in TRANS_TEMPLATE with the name of the host; if
0, or it doesn't occur, the host name is appended as an additional
argument. */
char *host_pat;
/* Constant fields for host 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 host entry. */
struct hostmux_name
{
const char *name; /* Looked up name (may be a number). */
const char *canon; /* The canonical (fq) host name. */
/* A filesystem node associated with NAME. If NAME = CANON, then this will
refer to a node with a translator for that host, otherwise, the node
will be a symbolic link to the canonical name. */
struct node *node;
ino_t fileno; /* The inode number for this entry. */
struct hostmux_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 hosts served by it). */
struct hostmux *mux;
/* For mux nodes, 0, and for leaf nodes, the name under which the node was
looked up. */
struct hostmux_name *name;
};
/* Timestamps to change. */
#define TOUCH_ATIME 0x1
#define TOUCH_MTIME 0x2
#define TOUCH_CTIME 0x4
#ifndef HOSTMUX_EI
# define HOSTMUX_EI extern inline
#endif
/* Change the stat times of NODE as indicated by WHAT (from the set TOUCH_*)
to the current time. */
HOSTMUX_EI void touch (struct node *node, unsigned what)
{
struct timeval tv;
maptime_read (hostmux_mapped_time, &tv);
if (what & TOUCH_ATIME)
{
netfs_root_node->nn_stat.st_atime = tv.tv_sec;
netfs_root_node->nn_stat.st_atime_usec = tv.tv_usec;
}
if (what & TOUCH_CTIME)
{
netfs_root_node->nn_stat.st_ctime = tv.tv_sec;
netfs_root_node->nn_stat.st_ctime_usec = tv.tv_usec;
}
if (what & TOUCH_MTIME)
{
netfs_root_node->nn_stat.st_mtime = tv.tv_sec;
netfs_root_node->nn_stat.st_mtime_usec = tv.tv_usec;
}
}
#endif /* __HOSTMUX_H__ */
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