1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2010 ProFUSION embedded systems
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
23 #include <sys/types.h>
24 #include <sys/reboot.h>
25 #include <linux/reboot.h>
27 #include <sys/types.h>
29 #include <sys/mount.h>
30 #include <sys/syscall.h>
48 #define FINALIZE_ATTEMPTS 50
50 static int prepare_new_root(void) {
51 static const char dirs[] =
52 "/run/initramfs/oldroot\0"
53 "/run/initramfs/proc\0"
54 "/run/initramfs/sys\0"
55 "/run/initramfs/dev\0"
56 "/run/initramfs/run\0";
60 if (mount("/run/initramfs", "/run/initramfs", NULL, MS_BIND, NULL) < 0) {
61 log_error("Failed to mount bind /run/initramfs on /run/initramfs: %m");
65 if (mount(NULL, "/run/initramfs", NULL, MS_PRIVATE, NULL) < 0) {
66 log_error("Failed to make /run/initramfs private mount: %m");
70 NULSTR_FOREACH(dir, dirs)
71 if (mkdir_p_label(dir, 0755) < 0 && errno != EEXIST) {
72 log_error("Failed to mkdir %s: %m", dir);
76 if (mount("/sys", "/run/initramfs/sys", NULL, MS_BIND, NULL) < 0) {
77 log_error("Failed to mount bind /sys on /run/initramfs/sys: %m");
81 if (mount("/proc", "/run/initramfs/proc", NULL, MS_BIND, NULL) < 0) {
82 log_error("Failed to mount bind /proc on /run/initramfs/proc: %m");
86 if (mount("/dev", "/run/initramfs/dev", NULL, MS_BIND, NULL) < 0) {
87 log_error("Failed to mount bind /dev on /run/initramfs/dev: %m");
91 if (mount("/run", "/run/initramfs/run", NULL, MS_BIND, NULL) < 0) {
92 log_error("Failed to mount bind /run on /run/initramfs/run: %m");
99 static int pivot_to_new_root(void) {
101 if (chdir("/run/initramfs") < 0) {
102 log_error("Failed to change directory to /run/initramfs: %m");
107 In case some evil process made "/" MS_SHARED
108 It works for pivot_root, but the ref count for the root device
109 is not decreasing :-/
111 if (mount(NULL, "/", NULL, MS_PRIVATE, NULL) < 0) {
112 log_error("Failed to make \"/\" private mount %m");
116 if (pivot_root(".", "oldroot") < 0) {
117 log_error("pivot failed: %m");
118 /* only chroot if pivot root succeded */
125 make_console_stdio();
127 log_info("Successfully changed into root pivot.");
132 int main(int argc, char *argv[]) {
135 bool need_umount = true, need_swapoff = true, need_loop_detach = true, need_dm_detach = true;
136 bool in_container, use_watchdog = false;
139 log_parse_environment();
140 log_set_target(LOG_TARGET_CONSOLE); /* syslog will die if not gone yet */
146 log_error("Not executed by init (pid 1).");
152 log_error("Invalid number of arguments.");
157 in_container = detect_container(NULL) > 0;
159 if (streq(argv[1], "reboot"))
161 else if (streq(argv[1], "poweroff"))
163 else if (streq(argv[1], "halt"))
164 cmd = RB_HALT_SYSTEM;
165 else if (streq(argv[1], "kexec"))
166 cmd = LINUX_REBOOT_CMD_KEXEC;
168 log_error("Unknown action '%s'.", argv[1]);
173 use_watchdog = !!getenv("WATCHDOG_USEC");
175 /* lock us into memory */
176 mlockall(MCL_CURRENT|MCL_FUTURE);
178 log_info("Sending SIGTERM to remaining processes...");
179 broadcast_signal(SIGTERM);
181 log_info("Sending SIGKILL to remaining processes...");
182 broadcast_signal(SIGKILL);
185 need_swapoff = false;
186 need_dm_detach = false;
189 /* Unmount all mountpoints, swaps, and loopback devices */
190 for (retries = 0; retries < FINALIZE_ATTEMPTS; retries++) {
191 bool changed = false;
197 log_info("Unmounting file systems.");
198 r = umount_all(&changed);
202 log_info("Not all file systems unmounted, %d left.", r);
204 log_error("Failed to unmount file systems: %s", strerror(-r));
208 log_info("Disabling swaps.");
209 r = swapoff_all(&changed);
211 need_swapoff = false;
213 log_info("Not all swaps are turned off, %d left.", r);
215 log_error("Failed to turn off swaps: %s", strerror(-r));
218 if (need_loop_detach) {
219 log_info("Detaching loop devices.");
220 r = loopback_detach_all(&changed);
222 need_loop_detach = false;
224 log_info("Not all loop devices detached, %d left.", r);
226 log_error("Failed to detach loop devices: %s", strerror(-r));
229 if (need_dm_detach) {
230 log_info("Detaching DM devices.");
231 r = dm_detach_all(&changed);
233 need_dm_detach = false;
235 log_warning("Not all DM devices detached, %d left.", r);
237 log_error("Failed to detach DM devices: %s", strerror(-r));
240 if (!need_umount && !need_swapoff && !need_loop_detach && !need_dm_detach) {
242 log_info("All filesystems, swaps, loop devices, DM devices detached.");
247 /* If in this iteration we didn't manage to
248 * unmount/deactivate anything, we simply give up */
250 log_error("Cannot finalize remaining file systems and devices, giving up.");
254 log_debug("Couldn't finalize remaining file systems and devices after %u retries, trying again.", retries+1);
257 if (retries >= FINALIZE_ATTEMPTS)
258 log_error("Too many iterations, giving up.");
261 arguments[1] = argv[1];
263 execute_directory(SYSTEM_SHUTDOWN_PATH, NULL, arguments);
265 /* If we are in a container, just exit, this will kill our
266 * container for good. */
268 log_error("Exiting container.");
272 if (access("/run/initramfs/shutdown", X_OK) == 0) {
274 if (prepare_new_root() >= 0 &&
275 pivot_to_new_root() >= 0) {
276 execv("/shutdown", argv);
277 log_error("Failed to execute shutdown binary: %m");
283 if (cmd == LINUX_REBOOT_CMD_KEXEC) {
284 /* We cheat and exec kexec to avoid doing all its work */
288 log_error("Could not fork: %m. Falling back to normal reboot.");
290 wait_for_terminate_and_warn("kexec", pid);
291 log_warning("kexec failed. Falling back to normal reboot.");
294 const char *args[3] = { "/sbin/kexec", "-e", NULL };
295 execv(args[0], (char * const *) args);
303 log_error("Failed to invoke reboot(): %m");
307 log_error("Critical error while doing system shutdown: %s", strerror(-r));