1 /* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*-
2 *
3 * Copyright (C) 2013 Marius Vollmer <marius.vollmer@redhat.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 *
19 */
20
21 #include "config.h"
22 #include <glib/gi18n-lib.h>
23 #include <glib/gstdio.h>
24 #include <gio/gunixfdlist.h>
25
26 #include <stdio.h>
27 #include <ctype.h>
28
29 #include <sys/types.h>
30 #include <sys/stat.h>
31 #include <fcntl.h>
32 #include <errno.h>
33 #include <pwd.h>
34 #include <fcntl.h>
35 #include <sys/ioctl.h>
36 #include <linux/fs.h>
37
38 #include <blockdev/lvm.h>
39
40 #include <limits.h>
41 #include <stdlib.h>
42
43 #include <src/udisksdaemon.h>
44 #include <src/udisksdaemonutil.h>
45 #include <src/udisksstate.h>
46 #include <src/udiskslogging.h>
47 #include <src/udiskslinuxblockobject.h>
48 #include <src/udiskslinuxdriveobject.h>
49 #include <src/udisksmodulemanager.h>
50
51 #include "udiskslvm2daemonutil.h"
52
53 /**
54 * SECTION:udiskslvm2daemonutil
55 * @title: Utilities
56 * @short_description: Various utility routines
57 *
58 * Various utility routines.
59 */
60
61 gboolean
udisks_daemon_util_lvm2_block_is_unused(UDisksBlock * block,GError ** error)62 udisks_daemon_util_lvm2_block_is_unused (UDisksBlock *block,
63 GError **error)
64 {
65 const gchar *device_file;
66 int fd;
67
68 device_file = udisks_block_get_device (block);
69 fd = open (device_file, O_RDONLY | O_EXCL);
70 if (fd < 0)
71 {
72 g_set_error (error, UDISKS_ERROR, UDISKS_ERROR_FAILED,
73 "Error opening device %s for unused block device detection: %m",
74 device_file);
75 return FALSE;
76 }
77 close (fd);
78
79 return TRUE;
80 }
81
82 static gboolean
run_sync(const gchar * prog,...)83 run_sync (const gchar *prog, ...)
84 {
85 va_list ap;
86 GError **error;
87 enum { max_argc = 20 };
88 const gchar *argv[max_argc+1];
89 int argc = 0;
90 const gchar *arg;
91 gchar *standard_output;
92 gchar *standard_error;
93 gint exit_status;
94
95 argv[argc++] = prog;
96 va_start (ap, prog);
97 while ((arg = va_arg (ap, const gchar *)))
98 {
99 if (argc < max_argc)
100 argv[argc] = arg;
101 argc++;
102 }
103 error = va_arg (ap, GError **);
104 va_end (ap);
105
106 if (argc > max_argc)
107 {
108 g_set_error (error, UDISKS_ERROR, UDISKS_ERROR_FAILED,
109 "Too many arguments.");
110 return FALSE;
111 }
112
113 argv[argc] = NULL;
114 if (!g_spawn_sync (NULL,
115 (gchar **)argv,
116 NULL,
117 G_SPAWN_SEARCH_PATH,
118 NULL,
119 NULL,
120 &standard_output,
121 &standard_error,
122 &exit_status,
123 error))
124 return FALSE;
125
126 if (!g_spawn_check_exit_status (exit_status, error))
127 {
128 g_prefix_error (error, "stdout: '%s', stderr: '%s', ", standard_output, standard_error);
129 g_free (standard_output);
130 g_free (standard_error);
131 return FALSE;
132 }
133
134 g_free (standard_output);
135 g_free (standard_error);
136 return TRUE;
137 }
138
139 gboolean
udisks_daemon_util_lvm2_wipe_block(UDisksDaemon * daemon,UDisksBlock * block,GError ** error)140 udisks_daemon_util_lvm2_wipe_block (UDisksDaemon *daemon,
141 UDisksBlock *block,
142 GError **error)
143 {
144 UDisksObject *block_object;
145 UDisksPhysicalVolume *physical_volume;
146 const gchar *volume_group_objpath;
147 UDisksObject *volume_group_object = NULL;
148 UDisksVolumeGroup *volume_group;
149 gchar *volume_group_name = NULL;
150 gboolean was_partitioned;
151
152 const gchar *device_file;
153 int fd = -1;
154 gchar zeroes[512];
155 gboolean ret = TRUE;
156 GError *local_error = NULL;
157
158 /* Find the name of the volume group that this device is a physical
159 * member of, if any. Easy.
160 */
161
162 block_object = UDISKS_OBJECT (g_dbus_interface_get_object (G_DBUS_INTERFACE (block)));
163 physical_volume = udisks_object_peek_physical_volume (block_object);
164 if (physical_volume)
165 {
166 volume_group_objpath = udisks_physical_volume_get_volume_group (physical_volume);
167 volume_group_object = udisks_daemon_find_object (daemon, volume_group_objpath);
168 if (volume_group_object)
169 {
170 volume_group = udisks_object_peek_volume_group (volume_group_object);
171 if (volume_group)
172 volume_group_name = g_strdup (udisks_volume_group_get_name (volume_group));
173 }
174 }
175
176 was_partitioned = (udisks_object_peek_partition_table (block_object) != NULL);
177
178 device_file = udisks_block_get_device (block);
179
180 /* Remove partition table */
181 memset (zeroes, 0, 512);
182 fd = open (device_file, O_RDWR | O_EXCL);
183 if (fd < 0)
184 {
185 g_set_error (error, UDISKS_ERROR, UDISKS_ERROR_FAILED,
186 "Error opening device %s for wiping: %m",
187 device_file);
188 ret = FALSE;
189 goto out;
190 }
191
192 if (write (fd, zeroes, 512) != 512)
193 {
194 g_set_error (error, UDISKS_ERROR, UDISKS_ERROR_FAILED,
195 "Error erasing device %s: %m",
196 device_file);
197 ret = FALSE;
198 goto out;
199 }
200
201 if (was_partitioned && ioctl (fd, BLKRRPART, NULL) < 0)
202 {
203 g_set_error (error, UDISKS_ERROR, UDISKS_ERROR_FAILED,
204 "Error removing partition devices of %s: %m",
205 device_file);
206 ret = FALSE;
207 goto out;
208 }
209 close (fd);
210 fd = -1;
211
212 /* wipe other labels */
213 if (!run_sync ("wipefs", "-a", device_file, NULL, error))
214 {
215 ret = FALSE;
216 goto out;
217 }
218
219 /* Try to bring affected volume group back into consistency. */
220 if (volume_group_name != NULL)
221 if (!bd_lvm_vgreduce (volume_group_name, NULL /* device */, NULL /* extra */, &local_error)) {
222 udisks_warning ("%s", local_error->message);
223 g_clear_error (&local_error);
224 }
225
226 /* Make sure lvmetad knows about all this.
227 *
228 * XXX - We need to do this because of a bug in the LVM udev rules
229 * which often fail to run pvscan on "change" events.
230 *
231 * https://bugzilla.redhat.com/show_bug.cgi?id=1063813
232 */
233 if (!run_sync ("pvscan", "--cache", device_file, NULL, &local_error))
234 {
235 udisks_warning ("%s", local_error->message);
236 g_clear_error (&local_error);
237 }
238
239 out:
240 if (fd >= 0)
241 close (fd);
242 g_clear_object (&volume_group_object);
243 g_free (volume_group_name);
244 return ret;
245 }
246
247 /* -------------------------------------------------------------------------------- */
248
249 gboolean
udisks_daemon_util_lvm2_name_is_reserved(const gchar * name)250 udisks_daemon_util_lvm2_name_is_reserved (const gchar *name)
251 {
252 return (strchr (name, '[')
253 || strchr (name, ']')
254 || strstr (name, "_mlog")
255 || strstr (name, "_mimage")
256 || strstr (name, "_rimage")
257 || strstr (name, "_rmeta")
258 || strstr (name, "_tdata")
259 || strstr (name, "_tmeta")
260 || strstr (name, "_pmspare")
261 || g_str_has_prefix (name, "pvmove")
262 || g_str_has_prefix (name, "snapshot"));
263 }
264
265 /* -------------------------------------------------------------------------------- */
266
267 void
udisks_daemon_util_lvm2_trigger_udev(const gchar * device_file)268 udisks_daemon_util_lvm2_trigger_udev (const gchar *device_file)
269 {
270 int fd = open (device_file, O_RDWR);
271 if (fd >= 0)
272 close (fd);
273 }
274