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 */
51static char *tmpfs_match(am_opts *fo);
52static int tmpfs_mount(am_node *am, mntfs *mf);
53static int tmpfs_umount(am_node *am, mntfs *mf);
54
55/*
56 * Ops structure
57 */
58am_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 */
83static char *
84tmpfs_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
101static int
102mount_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
168static int
169tmpfs_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
185static int
186tmpfs_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