Initial checkin.

1 files changed, 122 insertions, 0 deletions

diff --git a/hostmux/hostmux.h b/hostmux/hostmux.h
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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__ */