1/*
2 * Copyright (c) 1997-2006 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 *
40 * File: am-utils/amd/ops_lofs.c
41 *
42 */
43
44/*
45 * Loopback file system
46 */
47
48#ifdef HAVE_CONFIG_H
49# include <config.h>
50#endif /* HAVE_CONFIG_H */
51#include <am_defs.h>
52#include <amd.h>
53
54/* forward definitions */
55static char *lofs_match(am_opts *fo);
56static int lofs_mount(am_node *am, mntfs *mf);
57static int lofs_umount(am_node *am, mntfs *mf);
58
59/*
60 * Ops structure
61 */
62am_ops lofs_ops =
63{
64  "lofs",
65  lofs_match,
66  0,				/* lofs_init */
67  lofs_mount,
68  lofs_umount,
69  amfs_error_lookup_child,
70  amfs_error_mount_child,
71  amfs_error_readdir,
72  0,				/* lofs_readlink */
73  0,				/* lofs_mounted */
74  0,				/* lofs_umounted */
75  amfs_generic_find_srvr,
76  0,				/* lofs_get_wchan */
77  FS_MKMNT | FS_NOTIMEOUT | FS_UBACKGROUND | FS_AMQINFO, /* nfs_fs_flags */
78#ifdef HAVE_FS_AUTOFS
79  AUTOFS_LOFS_FS_FLAGS,
80#endif /* HAVE_FS_AUTOFS */
81};
82
83
84/*
85 * LOFS needs remote filesystem.
86 */
87static char *
88lofs_match(am_opts *fo)
89{
90  if (!fo->opt_rfs) {
91    plog(XLOG_USER, "lofs: no source filesystem specified");
92    return 0;
93  }
94  dlog("LOFS: mounting fs \"%s\" on \"%s\"",
95       fo->opt_rfs, fo->opt_fs);
96
97  /*
98   * Determine magic cookie to put in mtab
99   */
100  return strdup(fo->opt_rfs);
101}
102
103
104int
105mount_lofs(char *mntdir, char *fs_name, char *opts, int on_autofs)
106{
107  mntent_t mnt;
108  int flags;
109
110  /*
111   * Figure out the name of the file system type.
112   */
113  MTYPE_TYPE type = MOUNT_TYPE_LOFS;
114
115  /*
116   * Fill in the mount structure
117   */
118  memset((voidp) &mnt, 0, sizeof(mnt));
119  mnt.mnt_dir = mntdir;
120  mnt.mnt_fsname = fs_name;
121  mnt.mnt_type = MNTTAB_TYPE_LOFS;
122  mnt.mnt_opts = opts;
123
124  flags = compute_mount_flags(&mnt);
125#ifdef HAVE_FS_AUTOFS
126  if (on_autofs)
127    flags |= autofs_compute_mount_flags(&mnt);
128#endif /* HAVE_FS_AUTOFS */
129
130  /*
131   * Call generic mount routine
132   */
133  return mount_fs(&mnt, flags, NULL, 0, type, 0, NULL, mnttab_file_name, on_autofs);
134}
135
136
137static int
138lofs_mount(am_node *am, mntfs *mf)
139{
140  int on_autofs = mf->mf_flags & MFF_ON_AUTOFS;
141  int error;
142
143  error = mount_lofs(mf->mf_mount, mf->mf_info, mf->mf_mopts, on_autofs);
144  if (error) {
145    errno = error;
146    plog(XLOG_ERROR, "mount_lofs: %m");
147    return error;
148  }
149  return 0;
150}
151
152
153static int
154lofs_umount(am_node *am, mntfs *mf)
155{
156  int unmount_flags = (mf->mf_flags & MFF_ON_AUTOFS) ? AMU_UMOUNT_AUTOFS : 0;
157
158  return UMOUNT_FS(mf->mf_mount, mnttab_file_name, unmount_flags);
159}
160