udev: unify event timeout handling

[elogind.git] / src / udev / udevd.c

diff --git a/src/udev/udevd.c b/src/udev/udevd.c
index a45d3240c6661165b35b92b4f6bcab62e2a8dda8..dee7a87647eba31e8a2efdd634704731dc2b87d2 100644 (file)
--- a/src/udev/udevd.c
+++ b/src/udev/udevd.c
@@ -74,6 +74,7 @@ static bool reload;
 static int children;
 static int children_max;
 static int exec_delay;
+static usec_t event_timeout_usec = 30 * USEC_PER_SEC;
 static sigset_t sigmask_orig;
 static UDEV_LIST(event_list);
 static UDEV_LIST(worker_list);
@@ -285,26 +286,17 @@ static void worker_new(struct event *event)
                                 udev_event->exec_delay = exec_delay;
 
                         /*
-                         * Take a "read lock" on the device node; this establishes
+                         * Take a shared lock on the device node; this establishes
                          * a concept of device "ownership" to serialize device
-                         * access. External processes holding a "write lock" will
+                         * access. External processes holding an exclusive lock will
                          * cause udev to skip the event handling; in the case udev
-                         * acquired the lock, the external process will block until
+                         * acquired the lock, the external process can block until
                          * udev has finished its event handling.
                          */
-
-                        /*
-                         * <kabi_> since we make check - device seems unused - we try
-                         *         ioctl to deactivate - and device is found to be opened
-                         * <kay> sure, you try to take a write lock
-                         * <kay> if you get it udev is out
-                         * <kay> if you can't get it, udev is busy
-                         * <kabi_> we cannot deactivate openned device  (as it is in-use)
-                         * <kay> maybe we should just exclude dm from that thing entirely
-                         * <kabi_> IMHO this sounds like a good plan for this moment
-                         */
-                        if (streq_ptr("block", udev_device_get_subsystem(dev)) &&
-                            !startswith(udev_device_get_sysname(dev), "dm-")) {
+                        if (!streq_ptr(udev_device_get_action(dev), "remove") &&
+                            streq_ptr("block", udev_device_get_subsystem(dev)) &&
+                            !startswith(udev_device_get_sysname(dev), "dm-") &&
+                            !startswith(udev_device_get_sysname(dev), "md")) {
                                 struct udev_device *d = dev;
 
                                 if (streq_ptr("partition", udev_device_get_devtype(d)))
@@ -322,9 +314,9 @@ static void worker_new(struct event *event)
                         }
 
                         /* apply rules, create node, symlinks */
-                        udev_event_execute_rules(udev_event, rules, &sigmask_orig);
+                        udev_event_execute_rules(udev_event, event_timeout_usec, rules, &sigmask_orig);
 
-                        udev_event_execute_run(udev_event, &sigmask_orig);
+                        udev_event_execute_run(udev_event, event_timeout_usec, &sigmask_orig);
 
                         /* apply/restore inotify watch */
                         if (udev_event->inotify_watch) {
@@ -1018,14 +1010,15 @@ static void kernel_cmdline_options(struct udev *udev)
                         children_max = strtoul(opt + 18, NULL, 0);
                 } else if (startswith(opt, "udev.exec-delay=")) {
                         exec_delay = strtoul(opt + 16, NULL, 0);
+                } else if (startswith(opt, "udev.event-timeout=")) {
+                        event_timeout_usec = strtoul(opt + 16, NULL, 0) * USEC_PER_SEC;
                 }
 
                 free(s);
         }
 }
 
-int main(int argc, char *argv[])
-{
+int main(int argc, char *argv[]) {
         struct udev *udev;
         sigset_t mask;
         int daemonize = false;
@@ -1035,6 +1028,7 @@ int main(int argc, char *argv[])
                 { "debug", no_argument, NULL, 'D' },
                 { "children-max", required_argument, NULL, 'c' },
                 { "exec-delay", required_argument, NULL, 'e' },
+                { "event-timeout", required_argument, NULL, 't' },
                 { "resolve-names", required_argument, NULL, 'N' },
                 { "help", no_argument, NULL, 'h' },
                 { "version", no_argument, NULL, 'V' },
@@ -1078,6 +1072,9 @@ int main(int argc, char *argv[])
                 case 'e':
                         exec_delay = strtoul(optarg, NULL, 0);
                         break;
+                case 't':
+                        event_timeout_usec = strtoul(optarg, NULL, 0) * USEC_PER_SEC;
+                        break;
                 case 'D':
                         debug = true;
                         log_set_max_level(LOG_DEBUG);
@@ -1102,6 +1099,7 @@ int main(int argc, char *argv[])
                                "  --debug\n"
                                "  --children-max=<maximum number of workers>\n"
                                "  --exec-delay=<seconds to wait before executing RUN=>\n"
+                               "  --event-timeout=<seconds to wait before terminating an event>\n"
                                "  --resolve-names=early|late|never\n"
                                "  --version\n"
                                "  --help\n"
@@ -1415,20 +1413,17 @@ int main(int argc, char *argv[])
                                 if (worker->state != WORKER_RUNNING)
                                         continue;
 
-                                if ((now(CLOCK_MONOTONIC) - worker->event_start_usec) > 30 * USEC_PER_SEC) {
-                                        log_error("worker [%u] %s timeout; kill it", worker->pid,
-                                            worker->event ? worker->event->devpath : "<idle>");
+                                if ((now(CLOCK_MONOTONIC) - worker->event_start_usec) > event_timeout_usec) {
+                                        log_error("worker [%u] %s timeout; kill it", worker->pid, worker->event->devpath);
                                         kill(worker->pid, SIGKILL);
                                         worker->state = WORKER_KILLED;
 
                                         /* drop reference taken for state 'running' */
                                         worker_unref(worker);
-                                        if (worker->event) {
-                                                log_error("seq %llu '%s' killed", udev_device_get_seqnum(worker->event->dev), worker->event->devpath);
-                                                worker->event->exitcode = -64;
-                                                event_queue_delete(worker->event);
-                                                worker->event = NULL;
-                                        }
+                                        log_error("seq %llu '%s' killed", udev_device_get_seqnum(worker->event->dev), worker->event->devpath);
+                                        worker->event->exitcode = -64;
+                                        event_queue_delete(worker->event);
+                                        worker->event = NULL;
                                 }
                         }