#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);
if (kill(-1, SIGSTOP) < 0)
log_warning("Failed kill(-1, SIGSTOP): %m");
- processes = killall(sign);
+ n_processes = killall(sign);
if (kill(-1, SIGCONT) < 0)
log_warning("Failed kill(-1, SIGCONT): %m");
- if (processes <= 0)
+ if (n_processes <= 0)
goto finish;
until = now(CLOCK_MONOTONIC) + TIMEOUT_USEC;
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;
}
finish:
sigprocmask(SIG_SETMASK, &oldmask, NULL);
- return processes;
+ return n_processes;
}
static int rescue_send_signal(int sign) {
}
int main(int argc, char *argv[]) {
- int cmd, r, retries;
+ 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_CONSOLE); /* syslog will die if not gone yet */
log_warning("Cannot send SIGKILL to all process: %s", strerror(r));
/* Unmount all mountpoints, swaps, and loopback devices */
- retries = FINALIZE_ATTEMPTS;
- for (;;) {
+ for (retries = 0; retries < FINALIZE_ATTEMPTS; retries++) {
+ bool changed = false;
+
if (need_umount) {
log_info("Unmounting filesystems.");
- r = umount_all();
+ r = umount_all(&changed);
if (r == 0)
need_umount = false;
else if (r > 0)
if (need_swapoff) {
log_info("Disabling swaps.");
- r = swapoff_all();
+ r = swapoff_all(&changed);
if (r == 0)
need_swapoff = false;
else if (r > 0)
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)
if (need_dm_detach) {
log_info("Detaching DM devices.");
- r = dm_detach_all();
+ r = dm_detach_all(&changed);
if (r == 0)
need_dm_detach = false;
else if (r > 0)
log_error("Error detaching dm devices: %s", strerror(-r));
}
- if (need_umount || need_swapoff || need_loop_detach || need_dm_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("Giving up. Actions left: Umount=%s, Swap off=%s, Loop detach=%s, dm detach=%s",
- yes_no(need_umount), yes_no(need_swapoff), yes_no(need_loop_detach), yes_no(need_dm_detach));
+ if (killed_everbody) {
+ /* Hmm, we already killed everybody,
+ * let's just give up */
+ log_error("Cannot finalize all filesystems and devices, giving up.");
break;
}
- } else
- break;
+
+ log_warning("Cannot finalize filesystems and devices, trying to kill remaining processes.");
+ rescue_send_signal(SIGTERM);
+ rescue_send_signal(SIGKILL);
+ killed_everbody = true;
+ }
+
+ log_debug("Couldn't finalize filesystems 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 normal reboot.");
else if (pid > 0) {
LIST_FIELDS (struct MountPoint, mount_point);
} MountPoint;
-static void mount_point_remove_and_free(MountPoint *mount_point, MountPoint **mount_point_list_head) {
- LIST_REMOVE(MountPoint, mount_point, *mount_point_list_head, mount_point);
+static void mount_point_free(MountPoint **head, MountPoint *m) {
+ assert(head);
+ assert(m);
- free(mount_point->path);
- free(mount_point);
+ LIST_REMOVE(MountPoint, mount_point, *head, m);
+
+ free(m->path);
+ free(m);
}
-static void mount_points_list_free(MountPoint **mount_point_list_head) {
- while (*mount_point_list_head)
- mount_point_remove_and_free(*mount_point_list_head, mount_point_list_head);
+static void mount_points_list_free(MountPoint **head) {
+ assert(head);
+
+ while (*head)
+ mount_point_free(head, *head);
}
-static int mount_points_list_get(MountPoint **mount_point_list_head) {
+static int mount_points_list_get(MountPoint **head) {
FILE *proc_self_mountinfo;
char *path, *p;
unsigned int i;
int r;
+ assert(head);
+
if (!(proc_self_mountinfo = fopen("/proc/self/mountinfo", "re")))
return -errno;
for (i = 1;; i++) {
int k;
- MountPoint *mp;
+ MountPoint *m;
path = p = NULL;
continue;
}
- if (!(mp = new0(MountPoint, 1))) {
+ if (!(m = new0(MountPoint, 1))) {
free(p);
r = -ENOMEM;
goto finish;
}
- mp->path = p;
- LIST_PREPEND(MountPoint, mount_point, *mount_point_list_head, mp);
+ m->path = p;
+ LIST_PREPEND(MountPoint, mount_point, *head, m);
}
r = 0;
return r;
}
-static int swap_list_get(MountPoint **swap_list_head) {
+static int swap_list_get(MountPoint **head) {
FILE *proc_swaps;
unsigned int i;
int r;
+ assert(head);
+
if (!(proc_swaps = fopen("/proc/swaps", "re")))
return -errno;
}
swap->path = d;
- LIST_PREPEND(MountPoint, mount_point, *swap_list_head, swap);
+ LIST_PREPEND(MountPoint, mount_point, *head, swap);
}
r = 0;
return r;
}
-static int loopback_list_get(MountPoint **loopback_list_head) {
+static int loopback_list_get(MountPoint **head) {
int r;
struct udev *udev;
struct udev_enumerate *e = NULL;
struct udev_list_entry *item = NULL, *first = NULL;
+ assert(head);
+
if (!(udev = udev_new())) {
r = -ENOMEM;
goto finish;
}
lb->path = loop;
- LIST_PREPEND(MountPoint, mount_point, *loopback_list_head, lb);
+ LIST_PREPEND(MountPoint, mount_point, *head, lb);
}
r = 0;
return r;
}
-static int dm_list_get(MountPoint **dm_list_head) {
+static int dm_list_get(MountPoint **head) {
int r;
struct udev *udev;
struct udev_enumerate *e = NULL;
struct udev_list_entry *item = NULL, *first = NULL;
+ assert(head);
+
if (!(udev = udev_new())) {
r = -ENOMEM;
goto finish;
m->path = node;
m->devnum = devnum;
- LIST_PREPEND(MountPoint, mount_point, *dm_list_head, m);
+ LIST_PREPEND(MountPoint, mount_point, *head, m);
}
r = 0;
r = ioctl(fd, LOOP_CLR_FD, 0);
close_nointr_nofail(fd);
+ if (r >= 0)
+ return 1;
+
/* ENXIO: not bound, so no error */
- return (r >= 0 || errno == ENXIO) ? 0 : -errno;
+ if (errno == ENXIO)
+ return 0;
+
+ return -errno;
}
static int delete_dm(dev_t devnum) {
return r >= 0 ? 0 : -errno;
}
-static int mount_points_list_umount(MountPoint **mount_point_list_head) {
- MountPoint *mp, *mp_next;
- int failed = 0;
+static int mount_points_list_umount(MountPoint **head, bool *changed) {
+ MountPoint *m, *n;
+ int n_failed = 0;
- LIST_FOREACH_SAFE(mount_point, mp, mp_next, *mount_point_list_head) {
- if (streq(mp->path, "/"))
+ assert(head);
+
+ LIST_FOREACH_SAFE(mount_point, m, n, *head) {
+ if (streq(m->path, "/"))
continue;
/* Trying to umount. Forcing to umount if busy (only for NFS mounts) */
- if (umount2(mp->path, MNT_FORCE) == 0)
- mount_point_remove_and_free(mp, mount_point_list_head);
- else {
- log_warning("Could not unmount %s: %m", mp->path);
- failed++;
+ if (umount2(m->path, MNT_FORCE) == 0) {
+
+ if (changed)
+ *changed = true;
+
+ mount_point_free(head, m);
+ } else {
+ log_warning("Could not unmount %s: %m", m->path);
+ n_failed++;
}
}
- return failed;
+ return n_failed;
}
-static int mount_points_list_remount_read_only(MountPoint **mount_point_list_head) {
- MountPoint *mp, *mp_next;
- int failed = 0;
+static int mount_points_list_remount_read_only(MountPoint **head, bool *changed) {
+ MountPoint *m, *n;
+ int n_failed = 0;
+
+ assert(head);
+
+ LIST_FOREACH_SAFE(mount_point, m, n, *head) {
- LIST_FOREACH_SAFE(mount_point, mp, mp_next, *mount_point_list_head) {
/* Trying to remount read-only */
- if (mount(NULL, mp->path, NULL, MS_MGC_VAL|MS_REMOUNT|MS_RDONLY, NULL) == 0)
- mount_point_remove_and_free(mp, mount_point_list_head);
- else {
- log_warning("Could not remount as read-only %s: %m", mp->path);
- failed++;
+ if (mount(NULL, m->path, NULL, MS_MGC_VAL|MS_REMOUNT|MS_RDONLY, NULL) == 0) {
+ if (changed)
+ *changed = true;
+
+ mount_point_free(head, m);
+ } else {
+ log_warning("Could not remount as read-only %s: %m", m->path);
+ n_failed++;
}
}
- return failed;
+ return n_failed;
}
-static int swap_points_list_off(MountPoint **swap_list_head) {
- MountPoint *swap, *swap_next;
- int failed = 0;
+static int swap_points_list_off(MountPoint **head, bool *changed) {
+ MountPoint *m, *n;
+ int n_failed = 0;
+
+ assert(head);
- LIST_FOREACH_SAFE(mount_point, swap, swap_next, *swap_list_head) {
- if (swapoff(swap->path) == 0)
- mount_point_remove_and_free(swap, swap_list_head);
- else {
- log_warning("Could not deactivate swap %s: %m", swap->path);
- failed++;
+ LIST_FOREACH_SAFE(mount_point, m, n, *head) {
+ if (swapoff(m->path) == 0) {
+ if (changed)
+ *changed = true;
+
+ mount_point_free(head, m);
+ } else {
+ log_warning("Could not deactivate swap %s: %m", m->path);
+ n_failed++;
}
}
- return failed;
+ return n_failed;
}
-static int loopback_points_list_detach(MountPoint **loopback_list_head) {
- MountPoint *loopback, *loopback_next;
- int failed = 0;
+static int loopback_points_list_detach(MountPoint **head, bool *changed) {
+ MountPoint *m, *n;
+ int n_failed = 0;
+
+ assert(head);
+
+ LIST_FOREACH_SAFE(mount_point, m, n, *head) {
+ int r;
- LIST_FOREACH_SAFE(mount_point, loopback, loopback_next, *loopback_list_head) {
- if (delete_loopback(loopback->path) == 0)
- mount_point_remove_and_free(loopback, loopback_list_head);
- else {
- log_warning("Could not delete loopback %s: %m", loopback->path);
- failed++;
+ if ((r = delete_loopback(m->path)) >= 0) {
+
+ if (r > 0 && changed)
+ *changed = true;
+
+ mount_point_free(head, m);
+ } else {
+ log_warning("Could not delete loopback %s: %m", m->path);
+ n_failed++;
}
}
- return failed;
+ return n_failed;
}
-static int dm_points_list_detach(MountPoint **dm_list_head) {
- MountPoint *dm, *dm_next;
- int failed = 0;
+static int dm_points_list_detach(MountPoint **head, bool *changed) {
+ MountPoint *m, *n;
+ int n_failed = 0;
+
+ assert(head);
+
+ LIST_FOREACH_SAFE(mount_point, m, n, *head) {
+ int r;
+
+ if ((r = delete_dm(m->devnum)) >= 0) {
+
+ if (r > 0 && changed)
+ *changed = true;
- LIST_FOREACH_SAFE(mount_point, dm, dm_next, *dm_list_head) {
- if (delete_dm(dm->devnum) == 0)
- mount_point_remove_and_free(dm, dm_list_head);
- else {
- log_warning("Could not delete dm %s: %m", dm->path);
- failed++;
+ mount_point_free(head, m);
+ } else {
+ log_warning("Could not delete dm %s: %m", m->path);
+ n_failed++;
}
}
- return failed;
+ return n_failed;
}
-int umount_all(void) {
+int umount_all(bool *changed) {
int r;
LIST_HEAD(MountPoint, mp_list_head);
if (r < 0)
goto end;
- r = mount_points_list_umount(&mp_list_head);
+ r = mount_points_list_umount(&mp_list_head, changed);
if (r <= 0)
goto end;
- r = mount_points_list_remount_read_only(&mp_list_head);
+ r = mount_points_list_remount_read_only(&mp_list_head, changed);
end:
mount_points_list_free(&mp_list_head);
return r;
}
-int swapoff_all(void) {
+int swapoff_all(bool *changed) {
int r;
LIST_HEAD(MountPoint, swap_list_head);
if (r < 0)
goto end;
- r = swap_points_list_off(&swap_list_head);
+ r = swap_points_list_off(&swap_list_head, changed);
end:
mount_points_list_free(&swap_list_head);
return r;
}
-int loopback_detach_all(void) {
+int loopback_detach_all(bool *changed) {
int r;
LIST_HEAD(MountPoint, loopback_list_head);
if (r < 0)
goto end;
- r = loopback_points_list_detach(&loopback_list_head);
+ r = loopback_points_list_detach(&loopback_list_head, changed);
end:
mount_points_list_free(&loopback_list_head);
return r;
}
-int dm_detach_all(void) {
+int dm_detach_all(bool *changed) {
int r;
LIST_HEAD(MountPoint, dm_list_head);
if (r < 0)
goto end;
- r = dm_points_list_detach(&dm_list_head);
+ r = dm_points_list_detach(&dm_list_head, changed);
end:
mount_points_list_free(&dm_list_head);
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