1 /* $NetBSD: ops_lofs.c,v 1.1.1.3 2015/01/17 16:34:15 christos Exp $ */
2
3 /*
4 * Copyright (c) 1997-2014 Erez Zadok
5 * Copyright (c) 1990 Jan-Simon Pendry
6 * Copyright (c) 1990 Imperial College of Science, Technology & Medicine
7 * Copyright (c) 1990 The Regents of the University of California.
8 * All rights reserved.
9 *
10 * This code is derived from software contributed to Berkeley by
11 * Jan-Simon Pendry at Imperial College, London.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 *
37 *
38 * File: am-utils/amd/ops_lofs.c
39 *
40 */
41
42 /*
43 * Loopback file system
44 */
45
46 #ifdef HAVE_CONFIG_H
47 # include <config.h>
48 #endif /* HAVE_CONFIG_H */
49 #include <am_defs.h>
50 #include <amd.h>
51
52 /* forward definitions */
53 static char *lofs_match(am_opts *fo);
54 static int lofs_mount(am_node *am, mntfs *mf);
55 static int lofs_umount(am_node *am, mntfs *mf);
56
57 /*
58 * Ops structure
59 */
60 am_ops lofs_ops =
61 {
62 "lofs",
63 lofs_match,
64 0, /* lofs_init */
65 lofs_mount,
66 lofs_umount,
67 amfs_error_lookup_child,
68 amfs_error_mount_child,
69 amfs_error_readdir,
70 0, /* lofs_readlink */
71 0, /* lofs_mounted */
72 0, /* lofs_umounted */
73 amfs_generic_find_srvr,
74 0, /* lofs_get_wchan */
75 FS_MKMNT | FS_NOTIMEOUT | FS_UBACKGROUND | FS_AMQINFO, /* nfs_fs_flags */
76 #ifdef HAVE_FS_AUTOFS
77 AUTOFS_LOFS_FS_FLAGS,
78 #endif /* HAVE_FS_AUTOFS */
79 };
80
81
82 /*
83 * LOFS needs remote filesystem.
84 */
85 static char *
lofs_match(am_opts * fo)86 lofs_match(am_opts *fo)
87 {
88 if (!fo->opt_rfs) {
89 plog(XLOG_USER, "lofs: no source filesystem specified");
90 return 0;
91 }
92 dlog("LOFS: mounting fs \"%s\" on \"%s\"",
93 fo->opt_rfs, fo->opt_fs);
94
95 /*
96 * Determine magic cookie to put in mtab
97 */
98 return xstrdup(fo->opt_rfs);
99 }
100
101
102 int
mount_lofs(char * mntdir,char * fs_name,char * opts,int on_autofs)103 mount_lofs(char *mntdir, char *fs_name, char *opts, int on_autofs)
104 {
105 mntent_t mnt;
106 int flags;
107
108 /*
109 * Figure out the name of the file system type.
110 */
111 MTYPE_TYPE type = MOUNT_TYPE_LOFS;
112
113 /*
114 * Fill in the mount structure
115 */
116 memset((voidp) &mnt, 0, sizeof(mnt));
117 mnt.mnt_dir = mntdir;
118 mnt.mnt_fsname = fs_name;
119 mnt.mnt_type = MNTTAB_TYPE_LOFS;
120 mnt.mnt_opts = opts;
121
122 flags = compute_mount_flags(&mnt);
123 #ifdef HAVE_FS_AUTOFS
124 if (on_autofs)
125 flags |= autofs_compute_mount_flags(&mnt);
126 #endif /* HAVE_FS_AUTOFS */
127
128 /*
129 * Call generic mount routine
130 */
131 return mount_fs(&mnt, flags, NULL, 0, type, 0, NULL, mnttab_file_name, on_autofs);
132 }
133
134
135 static int
lofs_mount(am_node * am,mntfs * mf)136 lofs_mount(am_node *am, mntfs *mf)
137 {
138 int on_autofs = mf->mf_flags & MFF_ON_AUTOFS;
139 int error;
140
141 error = mount_lofs(mf->mf_mount, mf->mf_info, mf->mf_mopts, on_autofs);
142 if (error) {
143 errno = error;
144 plog(XLOG_ERROR, "mount_lofs: %m");
145 return error;
146 }
147 return 0;
148 }
149
150
151 static int
lofs_umount(am_node * am,mntfs * mf)152 lofs_umount(am_node *am, mntfs *mf)
153 {
154 int unmount_flags = (mf->mf_flags & MFF_ON_AUTOFS) ? AMU_UMOUNT_AUTOFS : 0;
155
156 return UMOUNT_FS(mf->mf_mount, mnttab_file_name, unmount_flags);
157 }
158