ops_lofs.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/amd/ops_lofs.c
37 *
38 */
39
40/*
41 * Loopback file system
42 */
43
44#ifdef HAVE_CONFIG_H
45# include <config.h>
46#endif /* HAVE_CONFIG_H */
47#include <am_defs.h>
48#include <amd.h>
49
50/* forward definitions */
51static char *lofs_match(am_opts *fo);
52static int lofs_mount(am_node *am, mntfs *mf);
53static int lofs_umount(am_node *am, mntfs *mf);
54
55/*
56 * Ops structure
57 */
58am_ops lofs_ops =
59{
60  "lofs",
61  lofs_match,
62  0,				/* lofs_init */
63  lofs_mount,
64  lofs_umount,
65  amfs_error_lookup_child,
66  amfs_error_mount_child,
67  amfs_error_readdir,
68  0,				/* lofs_readlink */
69  0,				/* lofs_mounted */
70  0,				/* lofs_umounted */
71  amfs_generic_find_srvr,
72  0,				/* lofs_get_wchan */
73  FS_MKMNT | FS_NOTIMEOUT | FS_UBACKGROUND | FS_AMQINFO, /* nfs_fs_flags */
74#ifdef HAVE_FS_AUTOFS
75  AUTOFS_LOFS_FS_FLAGS,
76#endif /* HAVE_FS_AUTOFS */
77};
78
79
80/*
81 * LOFS needs remote filesystem.
82 */
83static char *
84lofs_match(am_opts *fo)
85{
86  if (!fo->opt_rfs) {
87    plog(XLOG_USER, "lofs: no source filesystem specified");
88    return 0;
89  }
90  dlog("LOFS: mounting fs \"%s\" on \"%s\"",
91       fo->opt_rfs, fo->opt_fs);
92
93  /*
94   * Determine magic cookie to put in mtab
95   */
96  return xstrdup(fo->opt_rfs);
97}
98
99
100int
101mount_lofs(char *mntdir, char *fs_name, char *opts, int on_autofs)
102{
103  mntent_t mnt;
104  int flags;
105
106  /*
107   * Figure out the name of the file system type.
108   */
109  MTYPE_TYPE type = MOUNT_TYPE_LOFS;
110
111  /*
112   * Fill in the mount structure
113   */
114  memset((voidp) &mnt, 0, sizeof(mnt));
115  mnt.mnt_dir = mntdir;
116  mnt.mnt_fsname = fs_name;
117  mnt.mnt_type = MNTTAB_TYPE_LOFS;
118  mnt.mnt_opts = opts;
119
120  flags = compute_mount_flags(&mnt);
121#ifdef HAVE_FS_AUTOFS
122  if (on_autofs)
123    flags |= autofs_compute_mount_flags(&mnt);
124#endif /* HAVE_FS_AUTOFS */
125
126  /*
127   * Call generic mount routine
128   */
129  return mount_fs(&mnt, flags, NULL, 0, type, 0, NULL, mnttab_file_name, on_autofs);
130}
131
132
133static int
134lofs_mount(am_node *am, mntfs *mf)
135{
136  int on_autofs = mf->mf_flags & MFF_ON_AUTOFS;
137  int error;
138
139  error = mount_lofs(mf->mf_mount, mf->mf_info, mf->mf_mopts, on_autofs);
140  if (error) {
141    errno = error;
142    plog(XLOG_ERROR, "mount_lofs: %m");
143    return error;
144  }
145  return 0;
146}
147
148
149static int
150lofs_umount(am_node *am, mntfs *mf)
151{
152  int unmount_flags = (mf->mf_flags & MFF_ON_AUTOFS) ? AMU_UMOUNT_AUTOFS : 0;
153
154  return UMOUNT_FS(mf->mf_mount, mnttab_file_name, unmount_flags);
155}
156