This file is part of systemd.
Copyright 2010 ProFUSION embedded systems
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
- (at your option) any later version.
-
- systemd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <errno.h>
#include <unistd.h>
#include "alloc-util.h"
+#include "async.h"
#include "cgroup-util.h"
#include "def.h"
#include "exec-util.h"
+#include "fd-util.h"
#include "fileio.h"
#include "killall.h"
#include "log.h"
#include "missing.h"
#include "parse-util.h"
#include "process-util.h"
+#include "reboot-util.h"
+#include "signal-util.h"
#include "string-util.h"
#include "switch-root.h"
#include "terminal-util.h"
#include "virt.h"
#include "watchdog.h"
-#define FINALIZE_ATTEMPTS 50
+#define SYNC_PROGRESS_ATTEMPTS 3
+#define SYNC_TIMEOUT_USEC (10*USEC_PER_SEC)
static char* arg_verb;
static uint8_t arg_exit_code;
+static usec_t arg_timeout = DEFAULT_TIMEOUT_USEC;
static int parse_argv(int argc, char *argv[]) {
enum {
ARG_LOG_COLOR,
ARG_LOG_LOCATION,
ARG_EXIT_CODE,
+ ARG_TIMEOUT,
};
static const struct option options[] = {
{ "log-color", optional_argument, NULL, ARG_LOG_COLOR },
{ "log-location", optional_argument, NULL, ARG_LOG_LOCATION },
{ "exit-code", required_argument, NULL, ARG_EXIT_CODE },
+ { "timeout", required_argument, NULL, ARG_TIMEOUT },
{}
};
case ARG_LOG_LEVEL:
r = log_set_max_level_from_string(optarg);
if (r < 0)
- log_error("Failed to parse log level %s, ignoring.", optarg);
+ log_error_errno(r, "Failed to parse log level %s, ignoring.", optarg);
break;
case ARG_LOG_TARGET:
r = log_set_target_from_string(optarg);
if (r < 0)
- log_error("Failed to parse log target %s, ignoring", optarg);
+ log_error_errno(r, "Failed to parse log target %s, ignoring", optarg);
break;
if (optarg) {
r = log_show_color_from_string(optarg);
if (r < 0)
- log_error("Failed to parse log color setting %s, ignoring", optarg);
+ log_error_errno(r, "Failed to parse log color setting %s, ignoring", optarg);
} else
log_show_color(true);
if (optarg) {
r = log_show_location_from_string(optarg);
if (r < 0)
- log_error("Failed to parse log location setting %s, ignoring", optarg);
+ log_error_errno(r, "Failed to parse log location setting %s, ignoring", optarg);
} else
log_show_location(true);
case ARG_EXIT_CODE:
r = safe_atou8(optarg, &arg_exit_code);
if (r < 0)
- log_error("Failed to parse exit code %s, ignoring", optarg);
+ log_error_errno(r, "Failed to parse exit code %s, ignoring", optarg);
+
+ break;
+
+ case ARG_TIMEOUT:
+ r = parse_sec(optarg, &arg_timeout);
+ if (r < 0)
+ log_error_errno(r, "Failed to parse shutdown timeout %s, ignoring", optarg);
break;
return switch_root("/run/initramfs", "/oldroot", false, MS_BIND);
}
+/* Read the following fields from /proc/meminfo:
+ *
+ * NFS_Unstable
+ * Writeback
+ * Dirty
+ *
+ * Return true if the sum of these fields is greater than the previous
+ * value input. For all other issues, report the failure and indicate that
+ * the sync is not making progress.
+ */
+static bool sync_making_progress(unsigned long long *prev_dirty) {
+ _cleanup_fclose_ FILE *f = NULL;
+ char line[LINE_MAX];
+ bool r = false;
+ unsigned long long val = 0;
+
+ f = fopen("/proc/meminfo", "re");
+ if (!f)
+ return log_warning_errno(errno, "Failed to open /proc/meminfo: %m");
+
+ FOREACH_LINE(line, f, log_warning_errno(errno, "Failed to parse /proc/meminfo: %m")) {
+ unsigned long long ull = 0;
+
+ if (!first_word(line, "NFS_Unstable:") && !first_word(line, "Writeback:") && !first_word(line, "Dirty:"))
+ continue;
+
+ errno = 0;
+ if (sscanf(line, "%*s %llu %*s", &ull) != 1) {
+ if (errno != 0)
+ log_warning_errno(errno, "Failed to parse /proc/meminfo: %m");
+ else
+ log_warning("Failed to parse /proc/meminfo");
+
+ return false;
+ }
+
+ val += ull;
+ }
+
+ r = *prev_dirty > val;
+
+ *prev_dirty = val;
+
+ return r;
+}
+
+static void sync_with_progress(void) {
+ unsigned long long dirty = ULONG_LONG_MAX;
+ unsigned checks;
+ pid_t pid;
+ int r;
+
+ BLOCK_SIGNALS(SIGCHLD);
+
+ /* Due to the possiblity of the sync operation hanging, we fork a child process and monitor the progress. If
+ * the timeout lapses, the assumption is that that particular sync stalled. */
+
+ r = asynchronous_sync(&pid);
+ if (r < 0) {
+ log_error_errno(r, "Failed to fork sync(): %m");
+ return;
+ }
+
+ log_info("Syncing filesystems and block devices.");
+
+ /* Start monitoring the sync operation. If more than
+ * SYNC_PROGRESS_ATTEMPTS lapse without progress being made,
+ * we assume that the sync is stalled */
+ for (checks = 0; checks < SYNC_PROGRESS_ATTEMPTS; checks++) {
+ r = wait_for_terminate_with_timeout(pid, SYNC_TIMEOUT_USEC);
+ if (r == 0)
+ /* Sync finished without error.
+ * (The sync itself does not return an error code) */
+ return;
+ else if (r == -ETIMEDOUT) {
+ /* Reset the check counter if the "Dirty" value is
+ * decreasing */
+ if (sync_making_progress(&dirty))
+ checks = 0;
+ } else {
+ log_error_errno(r, "Failed to sync filesystems and block devices: %m");
+ return;
+ }
+ }
+
+ /* Only reached in the event of a timeout. We should issue a kill
+ * to the stray process. */
+ log_error("Syncing filesystems and block devices - timed out, issuing SIGKILL to PID "PID_FMT".", pid);
+ (void) kill(pid, SIGKILL);
+}
+
int main(int argc, char *argv[]) {
bool need_umount, need_swapoff, need_loop_detach, need_dm_detach;
- bool in_container, use_watchdog = false;
+ bool in_container, use_watchdog = false, can_initrd;
_cleanup_free_ char *cgroup = NULL;
char *arguments[3];
- unsigned retries;
- int cmd, r;
+ int cmd, r, umount_log_level = LOG_INFO;
static const char* const dirs[] = {SYSTEM_SHUTDOWN_PATH, NULL};
+ char *watchdog_device;
+ /* The log target defaults to console, but the original systemd process will pass its log target in through a
+ * command line argument, which will override this default. Also, ensure we'll never log to the journal or
+ * syslog, as these logging daemons are either already dead or will die very soon. */
+
+ log_set_target(LOG_TARGET_CONSOLE);
+ log_set_prohibit_ipc(true);
log_parse_environment();
+
r = parse_argv(argc, argv);
if (r < 0)
goto error;
- /* journald will die if not gone yet. The log target defaults
- * to console, but may have been changed by command line options. */
-
- log_close_console(); /* force reopen of /dev/console */
log_open();
umask(0022);
else if (streq(arg_verb, "exit"))
cmd = 0; /* ignored, just checking that arg_verb is valid */
else {
- r = -EINVAL;
log_error("Unknown action '%s'.", arg_verb);
+ r = -EINVAL;
goto error;
}
(void) cg_get_root_path(&cgroup);
in_container = detect_container() > 0;
- use_watchdog = !!getenv("WATCHDOG_USEC");
+ use_watchdog = getenv("WATCHDOG_USEC");
+ watchdog_device = getenv("WATCHDOG_DEVICE");
+ if (watchdog_device) {
+ r = watchdog_set_device(watchdog_device);
+ if (r < 0)
+ log_warning_errno(r, "Failed to set watchdog device to %s, ignoring: %m",
+ watchdog_device);
+ }
/* Lock us into memory */
- mlockall(MCL_CURRENT|MCL_FUTURE);
+ (void) mlockall(MCL_CURRENT|MCL_FUTURE);
/* Synchronize everything that is not written to disk yet at this point already. This is a good idea so that
* slow IO is processed here already and the final process killing spree is not impacted by processes
- * desperately trying to sync IO to disk within their timeout. */
+ * desperately trying to sync IO to disk within their timeout. Do not remove this sync, data corruption will
+ * result. */
if (!in_container)
- sync();
+ sync_with_progress();
+
+ disable_coredumps();
log_info("Sending SIGTERM to remaining processes...");
- broadcast_signal(SIGTERM, true, true);
+ broadcast_signal(SIGTERM, true, true, arg_timeout);
log_info("Sending SIGKILL to remaining processes...");
- broadcast_signal(SIGKILL, true, false);
+ broadcast_signal(SIGKILL, true, false, arg_timeout);
need_umount = !in_container;
need_swapoff = !in_container;
need_loop_detach = !in_container;
need_dm_detach = !in_container;
+ can_initrd = !in_container && !in_initrd() && access("/run/initramfs/shutdown", X_OK) == 0;
/* Unmount all mountpoints, swaps, and loopback devices */
- for (retries = 0; retries < FINALIZE_ATTEMPTS; retries++) {
+ for (;;) {
bool changed = false;
if (use_watchdog)
if (need_umount) {
log_info("Unmounting file systems.");
- r = umount_all(&changed);
+ r = umount_all(&changed, umount_log_level);
if (r == 0) {
need_umount = false;
log_info("All filesystems unmounted.");
if (need_loop_detach) {
log_info("Detaching loop devices.");
- r = loopback_detach_all(&changed);
+ r = loopback_detach_all(&changed, umount_log_level);
if (r == 0) {
need_loop_detach = false;
log_info("All loop devices detached.");
if (need_dm_detach) {
log_info("Detaching DM devices.");
- r = dm_detach_all(&changed);
+ r = dm_detach_all(&changed, umount_log_level);
if (r == 0) {
need_dm_detach = false;
log_info("All DM devices detached.");
}
if (!need_umount && !need_swapoff && !need_loop_detach && !need_dm_detach) {
- if (retries > 0)
- log_info("All filesystems, swaps, loop devices, DM devices detached.");
+ log_info("All filesystems, swaps, loop devices and DM devices detached.");
/* Yay, done */
- goto initrd_jump;
+ break;
+ }
+
+ if (!changed && umount_log_level == LOG_INFO && !can_initrd) {
+ /* There are things we cannot get rid of. Loop one more time
+ * with LOG_ERR to inform the user. Note that we don't need
+ * to do this if there is a initrd to switch to, because that
+ * one is likely to get rid of the remounting mounts. If not,
+ * it will log about them. */
+ umount_log_level = LOG_ERR;
+ continue;
}
/* If in this iteration we didn't manage to
need_swapoff ? " swap devices," : "",
need_loop_detach ? " loop devices," : "",
need_dm_detach ? " DM devices," : "");
- goto initrd_jump;
+ break;
}
- log_debug("After %u retries, couldn't finalize remaining %s%s%s%s trying again.",
- retries + 1,
+ log_debug("Couldn't finalize remaining %s%s%s%s trying again.",
need_umount ? " file systems," : "",
need_swapoff ? " swap devices," : "",
need_loop_detach ? " loop devices," : "",
need_dm_detach ? " DM devices," : "");
}
- log_error("Too many iterations, giving up.");
-
- initrd_jump:
+ /* We're done with the watchdog. */
+ watchdog_free_device();
arguments[0] = NULL;
arguments[1] = arg_verb;
arguments[2] = NULL;
execute_directories(dirs, DEFAULT_TIMEOUT_USEC, NULL, NULL, arguments);
- if (!in_container && !in_initrd() &&
- access("/run/initramfs/shutdown", X_OK) == 0) {
+ if (can_initrd) {
r = switch_root_initramfs();
if (r >= 0) {
argv[0] = (char*) "/shutdown";
/* The kernel will automatically flush ATA disks and suchlike on reboot(), but the file systems need to be
* sync'ed explicitly in advance. So let's do this here, but not needlessly slow down containers. Note that we
* sync'ed things already once above, but we did some more work since then which might have caused IO, hence
- * let's doit once more. */
+ * let's do it once more. Do not remove this sync, data corruption will result. */
if (!in_container)
- sync();
+ sync_with_progress();
if (streq(arg_verb, "exit")) {
if (in_container)
- exit(arg_exit_code);
- else {
- /* We cannot exit() on the host, fallback on another
- * method. */
- cmd = RB_POWER_OFF;
- }
+ return arg_exit_code;
+
+ cmd = RB_POWER_OFF; /* We cannot exit() on the host, fallback on another method. */
}
switch (cmd) {
if (!in_container) {
/* We cheat and exec kexec to avoid doing all its work */
- pid_t pid;
-
log_info("Rebooting with kexec.");
- pid = fork();
- if (pid < 0)
- log_error_errno(errno, "Failed to fork: %m");
- else if (pid == 0) {
-
+ r = safe_fork("(sd-kexec)", FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS|FORK_LOG|FORK_WAIT, NULL);
+ if (r == 0) {
const char * const args[] = {
KEXEC, "-e", NULL
};
execv(args[0], (char * const *) args);
_exit(EXIT_FAILURE);
- } else
- wait_for_terminate_and_warn("kexec", pid, true);
+ }
+
+ /* If we are still running, then the kexec can't have worked, let's fall through */
}
cmd = RB_AUTOBOOT;
- /* Fall through */
+ _fallthrough_;
case RB_AUTOBOOT:
-
- if (!in_container) {
- _cleanup_free_ char *param = NULL;
-
- r = read_one_line_file("/run/systemd/reboot-param", ¶m);
- if (r < 0 && r != -ENOENT)
- log_warning_errno(r, "Failed to read reboot parameter file: %m");
-
- if (!isempty(param)) {
- log_info("Rebooting with argument '%s'.", param);
- syscall(SYS_reboot, LINUX_REBOOT_MAGIC1, LINUX_REBOOT_MAGIC2, LINUX_REBOOT_CMD_RESTART2, param);
- log_warning_errno(errno, "Failed to reboot with parameter, retrying without: %m");
- }
- }
-
+ (void) reboot_with_parameter(REBOOT_LOG);
log_info("Rebooting.");
break;
assert_not_reached("Unknown magic");
}
- reboot(cmd);
+ (void) reboot(cmd);
if (errno == EPERM && in_container) {
/* If we are in a container, and we lacked
* CAP_SYS_BOOT just exit, this will kill our
* container for good. */
log_info("Exiting container.");
- exit(0);
+ return EXIT_SUCCESS;
}
r = log_error_errno(errno, "Failed to invoke reboot(): %m");
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