umount: try to get rid of DM devices

[elogind.git] / src / shutdown.c

diff --git a/src/shutdown.c b/src/shutdown.c
index b78c74112a0c1930703e9c88963de4562cd246e6..2c14371df2692bf0b9105ccbc133cf7a7bc68309 100644 (file)
--- a/src/shutdown.c
+++ b/src/shutdown.c
@@ -36,7 +36,7 @@
 #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
 
@@ -198,17 +198,16 @@ finish:
         return r;
 }
 
-
 int main(int argc, char *argv[]) {
         int cmd, r, retries;
-        bool need_umount = true, need_swapoff = true, need_loop_detach = true;
+        bool need_umount = true, need_swapoff = true, need_loop_detach = true, need_dm_detach = true;
 
         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;
         }
@@ -247,14 +246,9 @@ int main(int argc, char *argv[]) {
         if (r < 0)
                 log_warning("Cannot send SIGKILL to all process: %s", strerror(r));
 
-
-        /* 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 */
+        /* Unmount all mountpoints, swaps, and loopback devices */
         retries = FINALIZE_ATTEMPTS;
-        while (need_umount || need_swapoff || need_loop_detach) {
+        for (;;) {
                 if (need_umount) {
                         log_info("Unmounting filesystems.");
                         r = umount_all();
@@ -286,26 +280,37 @@ int main(int argc, char *argv[]) {
                                 log_warning("Not all loop devices detached, %d left.", r);
                         else
                                 log_error("Error detaching loop devices: %s", strerror(-r));
+                }
 
+                if (need_dm_detach) {
+                        log_info("Detaching DM devices.");
+                        r = dm_detach_all();
+                        if (r == 0)
+                                need_dm_detach = false;
+                        else if (r > 0)
+                                log_warning("Not all dm devices detached, %d left.", r);
+                        else
+                                log_error("Error detaching dm devices: %s", strerror(-r));
                 }
 
-                if (need_umount || need_swapoff || need_loop_detach) {
+                if (need_umount || need_swapoff || need_loop_detach || need_dm_detach) {
                         retries--;
 
-                        if (retries <= FINALIZE_CRITICAL_ATTEMPTS) {
+                        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 (retries > 0)
-                                log_info("Action still required, %d tries left", retries);
+                                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;
+                                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));
+                                break;
                         }
-                }
+                } else
+                        break;
         }
 
         sync();
@@ -313,28 +318,29 @@ int main(int argc, char *argv[]) {
         if (cmd == LINUX_REBOOT_CMD_KEXEC) {
                 /* 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;
 }