umount_bsd44.c revision 310490 
1/*
2 * Copyright (c) 1997-2014 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. Neither the name of the University nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 *
36 * File: am-utils/conf/umount/umount_bsd44.c
37 *
38 */
39
40/*
41 * Unmounting filesystems under BSD 4.4.
42 */
43
44#ifdef HAVE_CONFIG_H
45# include <config.h>
46#endif /* HAVE_CONFIG_H */
47#include <am_defs.h>
48#include <amu.h>
49
50
51int
52umount_fs(char *mntdir, const char *mnttabname, u_int unmount_flags)
53{
54  int error;
55
56eintr:
57  error = unmount(mntdir, 0);
58  if (error < 0)
59    error = errno;
60
61  switch (error) {
62  case EINVAL:
63  case ENOTBLK:
64  case ENOENT:
65    plog(XLOG_WARNING, "unmount: %s is not mounted", mntdir);
66    error = 0;			/* Not really an error */
67    break;
68
69  case EINTR:
70    /* not sure why this happens, but it does.  ask kirk one day... */
71    dlog("%s: unmount: %m", mntdir);
72    goto eintr;
73
74#ifdef MNT2_GEN_OPT_FORCE
75  case EBUSY:
76  case EIO:
77  case ESTALE:
78    /* caller determines if forced unmounts should be used */
79    if (unmount_flags & AMU_UMOUNT_FORCE) {
80      error = umount2_fs(mntdir, unmount_flags);
81      if (error < 0)
82	error = errno;
83      else
84	return error;
85    }
86    /* fallthrough */
87#endif /* MNT2_GEN_OPT_FORCE */
88
89  default:
90    dlog("%s: unmount: %m", mntdir);
91    break;
92  }
93
94  return error;
95}
96
97
98#ifdef MNT2_GEN_OPT_FORCE
99/* force unmount, no questions asked, without touching mnttab file */
100int
101umount2_fs(const char *mntdir, u_int unmount_flags)
102{
103  int error = 0;
104
105  if (unmount_flags & AMU_UMOUNT_FORCE) {
106    plog(XLOG_INFO, "umount2_fs: trying unmount/forced on %s", mntdir);
107    error = unmount(mntdir, MNT2_GEN_OPT_FORCE);
108    if (error < 0 && (errno == EINVAL || errno == ENOENT))
109      error = 0;		/* ignore EINVAL/ENOENT */
110    if (error < 0)
111      plog(XLOG_WARNING, "%s: unmount/force: %m", mntdir);
112    else
113      dlog("%s: unmount/force: OK", mntdir);
114  }
115  return error;
116}
117#endif /* MNT2_GEN_OPT_FORCE */
118