#include "umount.h"
#include "util.h"
-#define TIMEOUT_USEC (5 * USEC_PER_SEC)
+#define TIMEOUT_USEC (5 * USEC_PER_SEC)
#define FINALIZE_ATTEMPTS 50
-#define FINALIZE_CRITICAL_ATTEMPTS 10
static bool ignore_proc(pid_t pid) {
if (pid == 1)
static int killall(int sign) {
DIR *dir;
struct dirent *d;
- unsigned int processes = 0;
+ unsigned int n_processes = 0;
if ((dir = opendir("/proc")) == NULL)
return -errno;
continue;
if (kill(pid, sign) == 0)
- processes++;
+ n_processes++;
else
log_warning("Could not kill %d: %m", pid);
}
closedir(dir);
- return processes;
+ return n_processes;
}
static int send_signal(int sign) {
sigset_t mask, oldmask;
usec_t until;
- int processes;
+ int n_processes;
struct timespec ts;
assert_se(sigemptyset(&mask) == 0);
return -errno;
if (kill(-1, SIGSTOP) < 0)
- log_warning("Failed kill(-1, SIGSTOP): %m");
+ log_warning("kill(-1, SIGSTOP) failed: %m");
- processes = killall(sign);
+ n_processes = killall(sign);
if (kill(-1, SIGCONT) < 0)
- log_warning("Failed kill(-1, SIGCONT): %m");
+ log_warning("kill(-1, SIGCONT) failed: %m");
- if (processes <= 0)
+ if (n_processes <= 0)
goto finish;
until = now(CLOCK_MONOTONIC) + TIMEOUT_USEC;
for (;;) {
+ int k;
usec_t n = now(CLOCK_MONOTONIC);
+
for (;;) {
pid_t pid = waitpid(-1, NULL, WNOHANG);
+
if (pid == 0)
break;
else if (pid < 0 && errno == ECHILD) {
- processes = 0;
+ n_processes = 0;
goto finish;
}
- if (--processes == 0)
+ if (--n_processes == 0)
goto finish;
}
goto finish;
timespec_store(&ts, until - n);
- if (sigtimedwait(&mask, NULL, &ts) != SIGCHLD)
- log_warning("Failed: sigtimedwait did not return SIGCHLD: %m");
+ if ((k = sigtimedwait(&mask, NULL, &ts)) != SIGCHLD) {
+ if (k >= 0)
+ log_warning("sigtimedwait() returned unexpected signal.");
+ if (k < 0 && errno != EAGAIN)
+ log_warning("sigtimedwait() failed: %m");
+ }
}
finish:
sigprocmask(SIG_SETMASK, &oldmask, NULL);
- return processes;
+ return n_processes;
}
static int rescue_send_signal(int sign) {
return -errno;
if (kill(-1, SIGSTOP) < 0)
- log_warning("Failed kill(-1, SIGSTOP): %m");
+ log_warning("kill(-1, SIGSTOP) failed: %m");
r = kill(-1, sign);
if (r < 0)
- log_warning("Failed kill(-1, %d): %m", sign);
+ log_warning("kill(-1, %d) failed: %m", sign);
if (kill(-1, SIGCONT) < 0)
- log_warning("Failed kill(-1, SIGCONT): %m");
+ log_warning("kill(-1, SIGCONT) failed: %m");
if (r < 0)
goto finish;
until = now(CLOCK_MONOTONIC) + TIMEOUT_USEC;
for (;;) {
+ int k;
usec_t n = now(CLOCK_MONOTONIC);
+
for (;;) {
pid_t pid = waitpid(-1, NULL, WNOHANG);
if (pid == 0)
goto finish;
timespec_store(&ts, until - n);
- if (sigtimedwait(&mask, NULL, &ts) != SIGCHLD)
- log_warning("Failed: sigtimedwait did not return SIGCHLD: %m");
+ if ((k = sigtimedwait(&mask, NULL, &ts)) != SIGCHLD) {
+ if (k >= 0)
+ log_warning("sigtimedwait() returned unexpected signal.");
+ if (k < 0 && errno != EAGAIN)
+ log_warning("sigtimedwait() failed: %m");
+ }
}
finish:
return r;
}
-
int main(int argc, char *argv[]) {
- int cmd, r, retries;
- bool need_umount = true, need_swapoff = true, need_loop_detach = true;
+ int cmd, r;
+ unsigned retries;
+ bool need_umount = true, need_swapoff = true, need_loop_detach = true, need_dm_detach = true;
+ bool killed_everbody = false;
log_parse_environment();
- log_set_target(LOG_TARGET_KMSG); /* syslog will die if not gone yet */
+ log_set_target(LOG_TARGET_CONSOLE); /* syslog will die if not gone yet */
log_open();
if (getpid() != 1) {
- log_error("Not executed by init (pid-1).");
+ log_error("Not executed by init (pid 1).");
r = -EPERM;
goto error;
}
if (mlockall(MCL_CURRENT|MCL_FUTURE) != 0)
log_warning("Cannot lock process memory: %m");
- log_info("Sending SIGTERM to processes");
+ log_info("Sending SIGTERM to remaining processes...");
r = send_signal(SIGTERM);
if (r < 0)
- log_warning("Cannot send SIGTERM to all process: %s", strerror(r));
+ log_warning("Failed to send SIGTERM to remaining processes: %s", strerror(r));
- log_info("Sending SIGKILL to processes");
+ log_info("Sending SIGKILL to remaining processes...");
r = send_signal(SIGKILL);
if (r < 0)
- log_warning("Cannot send SIGKILL to all process: %s", strerror(r));
+ log_warning("Failed to send SIGKILL to remaining processes: %s", strerror(r));
+ /* Unmount all mountpoints, swaps, and loopback devices */
+ for (retries = 0; retries < FINALIZE_ATTEMPTS; retries++) {
+ bool changed = false;
- /* preventing that we won't block umounts */
- if (chdir("/") != 0)
- log_warning("Cannot chdir(\"/\"): %m. Unmounts likely to fail.");
-
- /* umount all mountpoints, swaps, and loopback devices */
- retries = FINALIZE_ATTEMPTS;
- while (need_umount || need_swapoff || need_loop_detach) {
if (need_umount) {
- log_info("Unmounting filesystems.");
- r = umount_all();
+ log_info("Unmounting file systems.");
+ r = umount_all(&changed);
if (r == 0)
need_umount = false;
else if (r > 0)
- log_warning("Not all filesystems unmounted, %d left.", r);
+ log_info("Not all file systems unmounted, %d left.", r);
else
- log_error("Error unmounting filesystems: %s", strerror(-r));
+ log_error("Failed to unmount file systems: %s", strerror(-r));
}
if (need_swapoff) {
log_info("Disabling swaps.");
- r = swapoff_all();
+ r = swapoff_all(&changed);
if (r == 0)
need_swapoff = false;
else if (r > 0)
- log_warning("Not all swaps are off, %d left.", r);
+ log_info("Not all swaps are turned off, %d left.", r);
else
- log_error("Error turning off swaps: %s", strerror(-r));
+ log_error("Failed to turn off swaps: %s", strerror(-r));
}
if (need_loop_detach) {
log_info("Detaching loop devices.");
- r = loopback_detach_all();
+ r = loopback_detach_all(&changed);
if (r == 0)
need_loop_detach = false;
else if (r > 0)
- log_warning("Not all loop devices detached, %d left.", r);
+ log_info("Not all loop devices detached, %d left.", r);
else
- log_error("Error detaching loop devices: %s", strerror(-r));
+ log_error("Failed to detach loop devices: %s", strerror(-r));
+ }
+ if (need_dm_detach) {
+ log_info("Detaching DM devices.");
+ r = dm_detach_all(&changed);
+ if (r == 0)
+ need_dm_detach = false;
+ else if (r > 0)
+ log_warning("Not all DM devices detached, %d left.", r);
+ else
+ log_error("Failed to detach DM devices: %s", strerror(-r));
}
- if (need_umount || need_swapoff || need_loop_detach) {
- retries--;
+ if (!need_umount && !need_swapoff && !need_loop_detach && !need_dm_detach)
+ /* Yay, done */
+ break;
- if (retries <= FINALIZE_CRITICAL_ATTEMPTS) {
- log_warning("Approaching critical level to finalize filesystem and devices, try to kill all processes.");
- rescue_send_signal(SIGTERM);
- rescue_send_signal(SIGKILL);
- }
+ /* If in this iteration we didn't manage to
+ * unmount/deactivate anything, we either kill more
+ * processes, or simply give up */
+ if (!changed) {
- if (retries > 0)
- log_info("Action still required, %d tries left", retries);
- else {
- log_error("Tried enough but still action required need_umount=%d, need_swapoff=%d, need_loop_detach=%d", need_umount, need_swapoff, need_loop_detach);
- r = -EBUSY;
- goto error;
+ if (killed_everbody) {
+ /* Hmm, we already killed everybody,
+ * let's just give up */
+ log_error("Cannot finalize remaining file systems and devices, giving up.");
+ break;
}
+
+ log_warning("Cannot finalize remaining file systems and devices, trying to kill remaining processes.");
+ rescue_send_signal(SIGTERM);
+ rescue_send_signal(SIGKILL);
+ killed_everbody = true;
}
+
+ log_debug("Couldn't finalize remaining file systems and devices after %u retries, trying again.", retries+1);
}
+ if (retries >= FINALIZE_ATTEMPTS)
+ log_error("Too many interations, giving up.");
+
sync();
if (cmd == LINUX_REBOOT_CMD_KEXEC) {
- /* we cheat and exec kexec to avoid doing all its work */
+ /* We cheat and exec kexec to avoid doing all its work */
pid_t pid = fork();
- if (pid < 0) {
- log_error("Could not fork: %m. Falling back to reboot.");
- cmd = RB_AUTOBOOT;
- } else if (pid > 0) {
- waitpid(pid, NULL, 0);
- log_warning("Failed %s -e -x -f. Falling back to reboot", KEXEC_BINARY_PATH);
- cmd = RB_AUTOBOOT;
+
+ if (pid < 0)
+ log_error("Could not fork: %m. Falling back to normal reboot.");
+ else if (pid > 0) {
+ wait_for_terminate_and_warn("kexec", pid);
+ log_warning("kexec failed. Falling back to normal reboot.");
} else {
- const char *args[5] = {KEXEC_BINARY_PATH, "-e", "-f", "-x", NULL};
+ /* Child */
+ const char *args[5] = { KEXEC_BINARY_PATH, "-e", "-f", "-x", NULL };
execv(args[0], (char * const *) args);
return EXIT_FAILURE;
}
+
+ cmd = RB_AUTOBOOT;
}
reboot(cmd);
- r = errno;
+ log_error("Failed to invoke reboot(): %m");
+ r = -errno;
error:
sync();
- if (r < 0)
- r = -r;
- log_error("Critical error while doing system shutdown: %s", strerror(r));
+ log_error("Critical error while doing system shutdown: %s", strerror(-r));
+
freeze();
return EXIT_FAILURE;
}
~ianmdlvl / elogind.git / blobdiff