amfs_error.c revision 82794 
1/*
2 * Copyright (c) 1997-2001 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 1.3.2.2 2001/01/12 23:28:56 ro 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
59static char *amfs_error_match(am_opts *fo);
60static int amfs_error_fmount(mntfs *mf);
61static int amfs_error_fumount(mntfs *mf);
62static void amfs_error_umounted(am_node *mp);
63
64
65/*
66 * Ops structure
67 */
68am_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 */
91static char *
92amfs_error_match(am_opts *fo)
93{
94  return strdup("(error-hook)");
95}
96
97
98static int
99amfs_error_fmount(mntfs *mf)
100{
101  return ENOENT;
102}
103
104
105static int
106amfs_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 */
120am_node *
121amfs_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 */
133int
134amfs_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 */
146static void
147amfs_error_umounted(am_node *mp)
148{
149  /* nothing to do */
150}
151