contrib/amd/amd/amfs_direct.c

   1 /*
   2  * Copyright (c) 1997-1999 Erez Zadok
   3  * Copyright (c) 1990 Jan-Simon Pendry
   4  * Copyright (c) 1990 Imperial College of Science, Technology & Medicine
   5  * Copyright (c) 1990 The Regents of the University of California.
   6  * All rights reserved.
   7  *
   8  * This code is derived from software contributed to Berkeley by
   9  * Jan-Simon Pendry at Imperial College, London.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. All advertising materials mentioning features or use of this software
  20  *    must display the following acknowledgment:
  21  *      This product includes software developed by the University of
  22  *      California, Berkeley and its contributors.
  23  * 4. Neither the name of the University nor the names of its contributors
  24  *    may be used to endorse or promote products derived from this software
  25  *    without specific prior written permission.
  26  *
  27  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  30  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  37  * SUCH DAMAGE.
  38  *
  39  *      %W% (Berkeley) %G%
  40  *
  41  * $Id: amfs_direct.c,v 1.2 1999/01/10 21:53:41 ezk Exp $
  42  *
  43  */
  44
  45 /*
  46  * Direct file system
  47  */
  48
  49 #ifdef HAVE_CONFIG_H
  50 # include <config.h>
  51 #endif /* HAVE_CONFIG_H */
  52 #include <am_defs.h>
  53 #include <amd.h>
  54
  55 /****************************************************************************
  56  *** FORWARD DEFINITIONS                                                  ***
  57  ****************************************************************************/
  58 static am_node *amfs_direct_readlink(am_node *mp, int *error_return);
  59
  60 /****************************************************************************
  61  *** OPS STRUCTURES                                                       ***
  62  ****************************************************************************/
  63 am_ops amfs_direct_ops =
  64 {
  65   "direct",
  66   amfs_auto_match,
  67   0,                            /* amfs_direct_init */
  68   amfs_toplvl_mount,
  69   0,
  70   amfs_toplvl_umount,
  71   0,
  72   amfs_error_lookuppn,
  73   amfs_error_readdir,
  74   amfs_direct_readlink,
  75   amfs_toplvl_mounted,
  76   0,                            /* amfs_auto_umounted */
  77   find_amfs_auto_srvr,
  78   FS_MKMNT | FS_NOTIMEOUT | FS_BACKGROUND | FS_AMQINFO
  79 };
  80
  81
  82 /****************************************************************************
  83  *** FUNCTIONS                                                             ***
  84  ****************************************************************************/
  85
  86 static am_node *
  87 amfs_direct_readlink(am_node *mp, int *error_return)
  88 {
  89   am_node *xp;
  90   int rc = 0;
  91
  92   xp = next_nonerror_node(mp->am_child);
  93   if (!xp) {
  94     if (!mp->am_mnt->mf_private)
  95       amfs_auto_mkcacheref(mp->am_mnt); /* XXX */
  96     xp = amfs_auto_lookuppn(mp, mp->am_path + 1, &rc, VLOOK_CREATE);
  97   }
  98   if (xp) {
  99     new_ttl(xp);                /* (7/12/89) from Rein Tollevik */
 100     return xp;
 101   }
 102   if (amd_state == Finishing)
 103     rc = ENOENT;
 104   *error_return = rc;
 105   return 0;
 106 }