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_tmpfs.c
37 *
38 */
39
40 /*
41 * TMPFS file system (combines RAM-fs and swap-fs)
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 declarations */
51 static char *tmpfs_match(am_opts *fo);
52 static int tmpfs_mount(am_node *am, mntfs *mf);
53 static int tmpfs_umount(am_node *am, mntfs *mf);
54
55 /*
56 * Ops structure
57 */
58 am_ops tmpfs_ops =
59 {
60 "tmpfs",
61 tmpfs_match,
62 0, /* tmpfs_init */
63 tmpfs_mount,
64 tmpfs_umount,
65 amfs_error_lookup_child,
66 amfs_error_mount_child,
67 amfs_error_readdir,
68 0, /* tmpfs_readlink */
69 0, /* tmpfs_mounted */
70 0, /* tmpfs_umounted */
71 amfs_generic_find_srvr,
72 0, /* tmpfs_get_wchan */
73 FS_MKMNT | FS_NOTIMEOUT | FS_UBACKGROUND | FS_AMQINFO, /* nfs_fs_flags */
74 #if defined(HAVE_FS_AUTOFS) && defined(AUTOFS_TMPFS_FS_FLAGS)
75 AUTOFS_TMPFS_FS_FLAGS,
76 #endif /* HAVE_FS_AUTOFS */
77 };
78
79
80 /*
81 * EFS needs local filesystem and device.
82 */
83 static char *
tmpfs_match(am_opts * fo)84 tmpfs_match(am_opts *fo)
85 {
86
87 if (!fo->opt_dev) {
88 plog(XLOG_USER, "tmpfs: no device specified");
89 return 0;
90 }
91
92 dlog("EFS: mounting device \"%s\" on \"%s\"", fo->opt_dev, fo->opt_fs);
93
94 /*
95 * Determine magic cookie to put in mtab
96 */
97 return xstrdup(fo->opt_dev);
98 }
99
100
101 static int
mount_tmpfs(char * mntdir,char * fs_name,char * opts,int on_autofs)102 mount_tmpfs(char *mntdir, char *fs_name, char *opts, int on_autofs)
103 {
104 tmpfs_args_t tmpfs_args;
105 mntent_t mnt;
106 int flags;
107 const char *p;
108
109 /*
110 * Figure out the name of the file system type.
111 */
112 MTYPE_TYPE type = MOUNT_TYPE_TMPFS;
113
114 p = NULL;
115 memset((voidp) &tmpfs_args, 0, sizeof(tmpfs_args)); /* Paranoid */
116
117 /*
118 * Fill in the mount structure
119 */
120 memset((voidp) &mnt, 0, sizeof(mnt));
121 mnt.mnt_dir = mntdir;
122 mnt.mnt_fsname = fs_name;
123 mnt.mnt_type = MNTTAB_TYPE_TMPFS;
124 mnt.mnt_opts = opts;
125
126 flags = compute_mount_flags(&mnt);
127 #ifdef HAVE_FS_AUTOFS
128 if (on_autofs)
129 flags |= autofs_compute_mount_flags(&mnt);
130 #endif /* HAVE_FS_AUTOFS */
131
132 #if defined(HAVE_TMPFS_ARGS_T_TA_VERSION) && defined(TMPFS_ARGS_VERSION)
133 tmpfs_args.ta_version = TMPFS_ARGS_VERSION;
134 #endif /* HAVE_TMPFS_ARGS_T_TA_VERSION && TMPFS_ARGS_VERSION */
135 #ifdef HAVE_TMPFS_ARGS_T_TA_NODES_MAX
136 if ((p = amu_hasmntopt(&mnt, "nodes")) == NULL)
137 p = "1000000";
138 tmpfs_args.ta_nodes_max = atoi(p);
139 #endif /* HAVE_TMPFS_ARGS_T_TA_SIZE_MAX */
140 #ifdef HAVE_TMPFS_ARGS_T_TA_SIZE_MAX
141 if ((p = amu_hasmntopt(&mnt, "size")) == NULL)
142 p = "10000000";
143 tmpfs_args.ta_size_max = atoi(p);
144 #endif /* HAVE_TMPFS_ARGS_T_TA_SIZE_MAX */
145 #ifdef HAVE_TMPFS_ARGS_T_TA_ROOT_UID
146 if ((p = amu_hasmntopt(&mnt, "uid")) == NULL)
147 p = "0";
148 tmpfs_args.ta_root_uid = atoi(p);
149 #endif /* HAVE_TMPFS_ARGS_T_TA_ROOT_UID */
150 #ifdef HAVE_TMPFS_ARGS_T_TA_ROOT_GID
151 if ((p = amu_hasmntopt(&mnt, "gid")) == NULL)
152 p = "0";
153 tmpfs_args.ta_root_gid = atoi(p);
154 #endif /* HAVE_TMPFS_ARGS_T_TA_ROOT_GID */
155 #ifdef HAVE_TMPFS_ARGS_T_TA_ROOT_MODE
156 if ((p = amu_hasmntopt(&mnt, "mode")) == NULL)
157 p = "01777";
158 tmpfs_args.ta_root_mode = strtol(p, NULL, 8);
159 #endif /* HAVE_TMPFS_ARGS_T_TA_ROOT_MODE */
160
161 /*
162 * Call generic mount routine
163 */
164 return mount_fs(&mnt, flags, (caddr_t) &tmpfs_args, 0, type, 0, NULL, mnttab_file_name, on_autofs);
165 }
166
167
168 static int
tmpfs_mount(am_node * am,mntfs * mf)169 tmpfs_mount(am_node *am, mntfs *mf)
170 {
171 int on_autofs = mf->mf_flags & MFF_ON_AUTOFS;
172 int error;
173
174 error = mount_tmpfs(mf->mf_mount, mf->mf_info, mf->mf_mopts, on_autofs);
175 if (error) {
176 errno = error;
177 plog(XLOG_ERROR, "mount_tmpfs: %m");
178 return error;
179 }
180
181 return 0;
182 }
183
184
185 static int
tmpfs_umount(am_node * am,mntfs * mf)186 tmpfs_umount(am_node *am, mntfs *mf)
187 {
188 int unmount_flags = (mf->mf_flags & MFF_ON_AUTOFS) ? AMU_UMOUNT_AUTOFS : 0;
189
190 return UMOUNT_FS(mf->mf_mount, mnttab_file_name, unmount_flags);
191 }
192
193