1 /* $NetBSD: ops_tmpfs.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_tmpfs.c
39 *
40 */
41
42 /*
43 * TMPFS file system (combines RAM-fs and swap-fs)
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 declarations */
53 static char *tmpfs_match(am_opts *fo);
54 static int tmpfs_mount(am_node *am, mntfs *mf);
55 static int tmpfs_umount(am_node *am, mntfs *mf);
56
57 /*
58 * Ops structure
59 */
60 am_ops tmpfs_ops =
61 {
62 "tmpfs",
63 tmpfs_match,
64 0, /* tmpfs_init */
65 tmpfs_mount,
66 tmpfs_umount,
67 amfs_error_lookup_child,
68 amfs_error_mount_child,
69 amfs_error_readdir,
70 0, /* tmpfs_readlink */
71 0, /* tmpfs_mounted */
72 0, /* tmpfs_umounted */
73 amfs_generic_find_srvr,
74 0, /* tmpfs_get_wchan */
75 FS_MKMNT | FS_NOTIMEOUT | FS_UBACKGROUND | FS_AMQINFO, /* nfs_fs_flags */
76 #if defined(HAVE_FS_AUTOFS) && defined(AUTOFS_TMPFS_FS_FLAGS)
77 AUTOFS_TMPFS_FS_FLAGS,
78 #endif /* HAVE_FS_AUTOFS */
79 };
80
81
82 /*
83 * EFS needs local filesystem and device.
84 */
85 static char *
tmpfs_match(am_opts * fo)86 tmpfs_match(am_opts *fo)
87 {
88
89 if (!fo->opt_dev) {
90 plog(XLOG_USER, "tmpfs: no device specified");
91 return 0;
92 }
93
94 dlog("EFS: mounting device \"%s\" on \"%s\"", fo->opt_dev, fo->opt_fs);
95
96 /*
97 * Determine magic cookie to put in mtab
98 */
99 return xstrdup(fo->opt_dev);
100 }
101
102
103 static int
mount_tmpfs(char * mntdir,char * fs_name,char * opts,int on_autofs)104 mount_tmpfs(char *mntdir, char *fs_name, char *opts, int on_autofs)
105 {
106 tmpfs_args_t tmpfs_args;
107 mntent_t mnt;
108 int flags;
109 const char *p;
110
111 /*
112 * Figure out the name of the file system type.
113 */
114 MTYPE_TYPE type = MOUNT_TYPE_TMPFS;
115
116 p = NULL;
117 memset((voidp) &tmpfs_args, 0, sizeof(tmpfs_args)); /* Paranoid */
118
119 /*
120 * Fill in the mount structure
121 */
122 memset((voidp) &mnt, 0, sizeof(mnt));
123 mnt.mnt_dir = mntdir;
124 mnt.mnt_fsname = fs_name;
125 mnt.mnt_type = MNTTAB_TYPE_TMPFS;
126 mnt.mnt_opts = opts;
127
128 flags = compute_mount_flags(&mnt);
129 #ifdef HAVE_FS_AUTOFS
130 if (on_autofs)
131 flags |= autofs_compute_mount_flags(&mnt);
132 #endif /* HAVE_FS_AUTOFS */
133
134 #if defined(HAVE_TMPFS_ARGS_T_TA_VERSION) && defined(TMPFS_ARGS_VERSION)
135 tmpfs_args.ta_version = TMPFS_ARGS_VERSION;
136 #endif /* HAVE_TMPFS_ARGS_T_TA_VERSION && TMPFS_ARGS_VERSION */
137 #ifdef HAVE_TMPFS_ARGS_T_TA_NODES_MAX
138 if ((p = amu_hasmntopt(&mnt, "nodes")) == NULL)
139 p = "1000000";
140 tmpfs_args.ta_nodes_max = atoi(p);
141 #endif /* HAVE_TMPFS_ARGS_T_TA_SIZE_MAX */
142 #ifdef HAVE_TMPFS_ARGS_T_TA_SIZE_MAX
143 if ((p = amu_hasmntopt(&mnt, "size")) == NULL)
144 p = "10000000";
145 tmpfs_args.ta_size_max = atoi(p);
146 #endif /* HAVE_TMPFS_ARGS_T_TA_SIZE_MAX */
147 #ifdef HAVE_TMPFS_ARGS_T_TA_ROOT_UID
148 if ((p = amu_hasmntopt(&mnt, "uid")) == NULL)
149 p = "0";
150 tmpfs_args.ta_root_uid = atoi(p);
151 #endif /* HAVE_TMPFS_ARGS_T_TA_ROOT_UID */
152 #ifdef HAVE_TMPFS_ARGS_T_TA_ROOT_GID
153 if ((p = amu_hasmntopt(&mnt, "gid")) == NULL)
154 p = "0";
155 tmpfs_args.ta_root_gid = atoi(p);
156 #endif /* HAVE_TMPFS_ARGS_T_TA_ROOT_GID */
157 #ifdef HAVE_TMPFS_ARGS_T_TA_ROOT_MODE
158 if ((p = amu_hasmntopt(&mnt, "mode")) == NULL)
159 p = "01777";
160 tmpfs_args.ta_root_mode = strtol(p, NULL, 8);
161 #endif /* HAVE_TMPFS_ARGS_T_TA_ROOT_MODE */
162
163 /*
164 * Call generic mount routine
165 */
166 return mount_fs(&mnt, flags, (caddr_t) &tmpfs_args, 0, type, 0, NULL, mnttab_file_name, on_autofs);
167 }
168
169
170 static int
tmpfs_mount(am_node * am,mntfs * mf)171 tmpfs_mount(am_node *am, mntfs *mf)
172 {
173 int on_autofs = mf->mf_flags & MFF_ON_AUTOFS;
174 int error;
175
176 error = mount_tmpfs(mf->mf_mount, mf->mf_info, mf->mf_mopts, on_autofs);
177 if (error) {
178 errno = error;
179 plog(XLOG_ERROR, "mount_tmpfs: %m");
180 return error;
181 }
182
183 return 0;
184 }
185
186
187 static int
tmpfs_umount(am_node * am,mntfs * mf)188 tmpfs_umount(am_node *am, mntfs *mf)
189 {
190 int unmount_flags = (mf->mf_flags & MFF_ON_AUTOFS) ? AMU_UMOUNT_AUTOFS : 0;
191
192 return UMOUNT_FS(mf->mf_mount, mnttab_file_name, unmount_flags);
193 }
194
195