contrib/amd/amd/amfs_error.c

   1 /*
   2  * Copyright (c) 1997-1999 Erez Zadok
   3  * Copyright (c) 1989 Jan-Simon Pendry
   4  * Copyright (c) 1989 Imperial College of Science, Technology & Medicine
   5  * Copyright (c) 1989 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_error.c,v 1.2 1999/01/10 21:53:41 ezk Exp $
  42  *
  43  */
  44
  45 /*
  46  * Error file system.
  47  * This is used as a last resort catchall if
  48  * nothing else worked.  EFS just returns lots
  49  * of error codes, except for unmount which
  50  * always works of course.
  51  */
  52
  53 #ifdef HAVE_CONFIG_H
  54 # include <config.h>
  55 #endif /* HAVE_CONFIG_H */
  56 #include <am_defs.h>
  57 #include <amd.h>
  58
  59 static char * amfs_error_match(am_opts *fo);
  60 static int amfs_error_fmount(mntfs *mf);
  61 static int amfs_error_fumount(mntfs *mf);
  62 static void amfs_error_umounted(am_node *mp);
  63
  64
  65 /*
  66  * Ops structure
  67  */
  68 am_ops amfs_error_ops =
  69 {
  70   "error",
  71   amfs_error_match,
  72   0,                            /* amfs_error_init */
  73   amfs_auto_fmount,
  74   amfs_error_fmount,
  75   amfs_auto_fumount,
  76   amfs_error_fumount,
  77   amfs_error_lookuppn,
  78   amfs_error_readdir,
  79   0,                            /* amfs_error_readlink */
  80   0,                            /* amfs_error_mounted */
  81   amfs_error_umounted,
  82   find_amfs_auto_srvr,
  83   FS_DISCARD
  84 };
  85
  86
  87
  88 /*
  89  * EFS file system always matches
  90  */
  91 static char *
  92 amfs_error_match(am_opts *fo)
  93 {
  94   return strdup("(error-hook)");
  95 }
  96
  97
  98 static int
  99 amfs_error_fmount(mntfs *mf)
 100 {
 101   return ENOENT;
 102 }
 103
 104
 105 static int
 106 amfs_error_fumount(mntfs *mf)
 107 {
 108   /*
 109    * Always succeed
 110    */
 111   return 0;
 112 }
 113
 114
 115 /*
 116  * EFS interface to RPC lookup() routine.
 117  * Should never get here in the automounter.
 118  * If we do then just give an error.
 119  */
 120 am_node *
 121 amfs_error_lookuppn(am_node *mp, char *fname, int *error_return, int op)
 122 {
 123   *error_return = ESTALE;
 124   return 0;
 125 }
 126
 127
 128 /*
 129  * EFS interface to RPC readdir() routine.
 130  * Should never get here in the automounter.
 131  * If we do then just give an error.
 132  */
 133 int
 134 amfs_error_readdir(am_node *mp, nfscookie cookie, nfsdirlist *dp, nfsentry *ep, int count)
 135 {
 136   return ESTALE;
 137 }
 138
 139
 140 /*
 141  * umounted() callback for EFS.
 142  *
 143  * This prevents core-dumps on callbacks to error file-systems from
 144  * nfsx_fumount.
 145  */
 146 static void
 147 amfs_error_umounted(am_node *mp)
 148 {
 149   /* nothing to do */
 150 }