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81c32b1d YW |
1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
2 | ||
3 | #include "blockdev-util.h" | |
4 | #include "cgroup-util.h" | |
5 | #include "common-signal.h" | |
ce5ddbc4 | 6 | #include "cpu-set-util.h" |
81c32b1d YW |
7 | #include "daemon-util.h" |
8 | #include "device-monitor-private.h" | |
9 | #include "device-private.h" | |
10 | #include "device-util.h" | |
11 | #include "errno-list.h" | |
12 | #include "event-util.h" | |
13 | #include "fd-util.h" | |
14 | #include "fs-util.h" | |
15 | #include "hashmap.h" | |
16 | #include "inotify-util.h" | |
bd1ae178 | 17 | #include "iovec-util.h" |
ce5ddbc4 | 18 | #include "limits-util.h" |
81c32b1d YW |
19 | #include "list.h" |
20 | #include "mkdir.h" | |
21 | #include "process-util.h" | |
22 | #include "selinux-util.h" | |
23 | #include "signal-util.h" | |
24 | #include "socket-util.h" | |
25 | #include "string-util.h" | |
26 | #include "syslog-util.h" | |
27 | #include "udev-builtin.h" | |
28 | #include "udev-ctrl.h" | |
29 | #include "udev-event.h" | |
30 | #include "udev-manager.h" | |
31 | #include "udev-node.h" | |
32 | #include "udev-spawn.h" | |
33 | #include "udev-trace.h" | |
34 | #include "udev-util.h" | |
35 | #include "udev-watch.h" | |
36 | #include "udev-worker.h" | |
37 | ||
ce5ddbc4 YW |
38 | #define WORKER_NUM_MAX UINT64_C(2048) |
39 | ||
81c32b1d YW |
40 | #define EVENT_RETRY_INTERVAL_USEC (200 * USEC_PER_MSEC) |
41 | #define EVENT_RETRY_TIMEOUT_USEC (3 * USEC_PER_MINUTE) | |
42 | ||
43 | typedef enum EventState { | |
44 | EVENT_UNDEF, | |
45 | EVENT_QUEUED, | |
46 | EVENT_RUNNING, | |
47 | } EventState; | |
48 | ||
49 | typedef struct Event { | |
50 | Manager *manager; | |
51 | Worker *worker; | |
52 | EventState state; | |
53 | ||
54 | sd_device *dev; | |
55 | ||
56 | sd_device_action_t action; | |
57 | uint64_t seqnum; | |
58 | uint64_t blocker_seqnum; | |
59 | const char *id; | |
60 | const char *devpath; | |
61 | const char *devpath_old; | |
62 | const char *devnode; | |
63 | ||
64 | /* Used when the device is locked by another program. */ | |
65 | usec_t retry_again_next_usec; | |
66 | usec_t retry_again_timeout_usec; | |
67 | sd_event_source *retry_event_source; | |
68 | ||
69 | sd_event_source *timeout_warning_event; | |
70 | sd_event_source *timeout_event; | |
71 | ||
72 | LIST_FIELDS(Event, event); | |
73 | } Event; | |
74 | ||
75 | typedef enum WorkerState { | |
76 | WORKER_UNDEF, | |
77 | WORKER_RUNNING, | |
78 | WORKER_IDLE, | |
79 | WORKER_KILLED, | |
80 | WORKER_KILLING, | |
81 | } WorkerState; | |
82 | ||
83 | typedef struct Worker { | |
84 | Manager *manager; | |
85 | pid_t pid; | |
86 | sd_event_source *child_event_source; | |
87 | sd_device_monitor *monitor; | |
88 | WorkerState state; | |
89 | Event *event; | |
90 | } Worker; | |
91 | ||
92 | static Event *event_free(Event *event) { | |
93 | if (!event) | |
94 | return NULL; | |
95 | ||
96 | assert(event->manager); | |
97 | ||
98 | LIST_REMOVE(event, event->manager->events, event); | |
99 | sd_device_unref(event->dev); | |
100 | ||
101 | sd_event_source_unref(event->retry_event_source); | |
102 | sd_event_source_unref(event->timeout_warning_event); | |
103 | sd_event_source_unref(event->timeout_event); | |
104 | ||
105 | if (event->worker) | |
106 | event->worker->event = NULL; | |
107 | ||
108 | return mfree(event); | |
109 | } | |
110 | ||
111 | static void event_queue_cleanup(Manager *manager, EventState match_state) { | |
112 | LIST_FOREACH(event, event, manager->events) { | |
113 | if (match_state != EVENT_UNDEF && match_state != event->state) | |
114 | continue; | |
115 | ||
116 | event_free(event); | |
117 | } | |
118 | } | |
119 | ||
120 | static Worker *worker_free(Worker *worker) { | |
121 | if (!worker) | |
122 | return NULL; | |
123 | ||
124 | if (worker->manager) | |
125 | hashmap_remove(worker->manager->workers, PID_TO_PTR(worker->pid)); | |
126 | ||
127 | sd_event_source_unref(worker->child_event_source); | |
128 | sd_device_monitor_unref(worker->monitor); | |
129 | event_free(worker->event); | |
130 | ||
131 | return mfree(worker); | |
132 | } | |
133 | ||
134 | DEFINE_TRIVIAL_CLEANUP_FUNC(Worker*, worker_free); | |
135 | DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(worker_hash_op, void, trivial_hash_func, trivial_compare_func, Worker, worker_free); | |
136 | ||
137 | Manager* manager_free(Manager *manager) { | |
138 | if (!manager) | |
139 | return NULL; | |
140 | ||
141 | udev_builtin_exit(); | |
142 | ||
143 | hashmap_free_free_free(manager->properties); | |
144 | udev_rules_free(manager->rules); | |
145 | ||
146 | hashmap_free(manager->workers); | |
147 | event_queue_cleanup(manager, EVENT_UNDEF); | |
148 | ||
149 | safe_close(manager->inotify_fd); | |
150 | safe_close_pair(manager->worker_watch); | |
151 | ||
152 | sd_device_monitor_unref(manager->monitor); | |
153 | udev_ctrl_unref(manager->ctrl); | |
154 | ||
155 | sd_event_source_unref(manager->inotify_event); | |
156 | sd_event_source_unref(manager->kill_workers_event); | |
157 | sd_event_source_unref(manager->memory_pressure_event_source); | |
158 | sd_event_source_unref(manager->sigrtmin18_event_source); | |
159 | sd_event_unref(manager->event); | |
160 | ||
161 | free(manager->cgroup); | |
162 | return mfree(manager); | |
163 | } | |
164 | ||
165 | static int on_sigchld(sd_event_source *s, const siginfo_t *si, void *userdata); | |
166 | ||
167 | static int worker_new(Worker **ret, Manager *manager, sd_device_monitor *worker_monitor, pid_t pid) { | |
168 | _cleanup_(worker_freep) Worker *worker = NULL; | |
169 | int r; | |
170 | ||
171 | assert(ret); | |
172 | assert(manager); | |
173 | assert(worker_monitor); | |
174 | assert(pid > 1); | |
175 | ||
176 | /* close monitor, but keep address around */ | |
177 | device_monitor_disconnect(worker_monitor); | |
178 | ||
179 | worker = new(Worker, 1); | |
180 | if (!worker) | |
181 | return -ENOMEM; | |
182 | ||
183 | *worker = (Worker) { | |
184 | .monitor = sd_device_monitor_ref(worker_monitor), | |
185 | .pid = pid, | |
186 | }; | |
187 | ||
188 | r = sd_event_add_child(manager->event, &worker->child_event_source, pid, WEXITED, on_sigchld, worker); | |
189 | if (r < 0) | |
190 | return r; | |
191 | ||
192 | r = hashmap_ensure_put(&manager->workers, &worker_hash_op, PID_TO_PTR(pid), worker); | |
193 | if (r < 0) | |
194 | return r; | |
195 | ||
196 | worker->manager = manager; | |
197 | ||
198 | *ret = TAKE_PTR(worker); | |
199 | return 0; | |
200 | } | |
201 | ||
202 | static void manager_kill_workers(Manager *manager, bool force) { | |
203 | Worker *worker; | |
204 | ||
205 | assert(manager); | |
206 | ||
207 | HASHMAP_FOREACH(worker, manager->workers) { | |
208 | if (worker->state == WORKER_KILLED) | |
209 | continue; | |
210 | ||
211 | if (worker->state == WORKER_RUNNING && !force) { | |
212 | worker->state = WORKER_KILLING; | |
213 | continue; | |
214 | } | |
215 | ||
216 | worker->state = WORKER_KILLED; | |
217 | (void) kill(worker->pid, SIGTERM); | |
218 | } | |
219 | } | |
220 | ||
221 | static void manager_exit(Manager *manager) { | |
222 | assert(manager); | |
223 | ||
224 | manager->exit = true; | |
225 | ||
226 | (void) sd_notify(/* unset= */ false, NOTIFY_STOPPING); | |
227 | ||
228 | /* close sources of new events and discard buffered events */ | |
229 | manager->ctrl = udev_ctrl_unref(manager->ctrl); | |
230 | ||
231 | manager->inotify_event = sd_event_source_disable_unref(manager->inotify_event); | |
232 | manager->inotify_fd = safe_close(manager->inotify_fd); | |
233 | ||
234 | manager->monitor = sd_device_monitor_unref(manager->monitor); | |
235 | ||
236 | /* discard queued events and kill workers */ | |
237 | event_queue_cleanup(manager, EVENT_QUEUED); | |
238 | manager_kill_workers(manager, true); | |
239 | } | |
240 | ||
241 | static void notify_ready(Manager *manager) { | |
242 | int r; | |
243 | ||
244 | assert(manager); | |
245 | ||
246 | r = sd_notifyf(/* unset= */ false, | |
247 | "READY=1\n" | |
248 | "STATUS=Processing with %u children at max", manager->children_max); | |
249 | if (r < 0) | |
250 | log_warning_errno(r, "Failed to send readiness notification, ignoring: %m"); | |
251 | } | |
252 | ||
253 | /* reload requested, HUP signal received, rules changed, builtin changed */ | |
254 | static void manager_reload(Manager *manager, bool force) { | |
255 | _cleanup_(udev_rules_freep) UdevRules *rules = NULL; | |
256 | usec_t now_usec; | |
257 | int r; | |
258 | ||
259 | assert(manager); | |
260 | ||
261 | assert_se(sd_event_now(manager->event, CLOCK_MONOTONIC, &now_usec) >= 0); | |
262 | if (!force && now_usec < usec_add(manager->last_usec, 3 * USEC_PER_SEC)) | |
263 | /* check for changed config, every 3 seconds at most */ | |
264 | return; | |
265 | manager->last_usec = now_usec; | |
266 | ||
267 | /* Reload SELinux label database, to make the child inherit the up-to-date database. */ | |
268 | mac_selinux_maybe_reload(); | |
269 | ||
270 | /* Nothing changed. It is not necessary to reload. */ | |
271 | if (!udev_rules_should_reload(manager->rules) && !udev_builtin_should_reload()) { | |
272 | ||
273 | if (!force) | |
274 | return; | |
275 | ||
276 | /* If we eat this up, then tell our service manager to just continue */ | |
277 | (void) sd_notifyf(/* unset= */ false, | |
278 | "RELOADING=1\n" | |
279 | "STATUS=Skipping configuration reloading, nothing changed.\n" | |
280 | "MONOTONIC_USEC=" USEC_FMT, now(CLOCK_MONOTONIC)); | |
281 | } else { | |
282 | (void) sd_notifyf(/* unset= */ false, | |
283 | "RELOADING=1\n" | |
284 | "STATUS=Flushing configuration...\n" | |
285 | "MONOTONIC_USEC=" USEC_FMT, now(CLOCK_MONOTONIC)); | |
286 | ||
287 | manager_kill_workers(manager, false); | |
288 | ||
289 | udev_builtin_exit(); | |
290 | udev_builtin_init(); | |
291 | ||
292 | r = udev_rules_load(&rules, manager->resolve_name_timing); | |
293 | if (r < 0) | |
294 | log_warning_errno(r, "Failed to read udev rules, using the previously loaded rules, ignoring: %m"); | |
295 | else | |
296 | udev_rules_free_and_replace(manager->rules, rules); | |
297 | } | |
298 | ||
299 | notify_ready(manager); | |
300 | } | |
301 | ||
302 | static int on_kill_workers_event(sd_event_source *s, uint64_t usec, void *userdata) { | |
303 | Manager *manager = ASSERT_PTR(userdata); | |
304 | ||
305 | log_debug("Cleanup idle workers"); | |
306 | manager_kill_workers(manager, false); | |
307 | ||
308 | return 1; | |
309 | } | |
310 | ||
311 | static int on_event_timeout(sd_event_source *s, uint64_t usec, void *userdata) { | |
312 | Event *event = ASSERT_PTR(userdata); | |
313 | ||
314 | assert(event->manager); | |
315 | assert(event->worker); | |
316 | ||
317 | kill_and_sigcont(event->worker->pid, event->manager->timeout_signal); | |
318 | event->worker->state = WORKER_KILLED; | |
319 | ||
320 | log_device_error(event->dev, "Worker ["PID_FMT"] processing SEQNUM=%"PRIu64" killed", event->worker->pid, event->seqnum); | |
321 | ||
322 | return 1; | |
323 | } | |
324 | ||
325 | static int on_event_timeout_warning(sd_event_source *s, uint64_t usec, void *userdata) { | |
326 | Event *event = ASSERT_PTR(userdata); | |
327 | ||
328 | assert(event->worker); | |
329 | ||
330 | log_device_warning(event->dev, "Worker ["PID_FMT"] processing SEQNUM=%"PRIu64" is taking a long time", event->worker->pid, event->seqnum); | |
331 | ||
332 | return 1; | |
333 | } | |
334 | ||
335 | static void worker_attach_event(Worker *worker, Event *event) { | |
336 | Manager *manager; | |
337 | sd_event *e; | |
338 | ||
339 | assert(worker); | |
340 | assert(worker->manager); | |
341 | assert(event); | |
342 | assert(!event->worker); | |
343 | assert(!worker->event); | |
344 | ||
345 | worker->state = WORKER_RUNNING; | |
346 | worker->event = event; | |
347 | event->state = EVENT_RUNNING; | |
348 | event->worker = worker; | |
349 | ||
350 | manager = worker->manager; | |
351 | e = manager->event; | |
352 | ||
353 | (void) sd_event_add_time_relative(e, &event->timeout_warning_event, CLOCK_MONOTONIC, | |
354 | udev_warn_timeout(manager->timeout_usec), USEC_PER_SEC, | |
355 | on_event_timeout_warning, event); | |
356 | ||
357 | (void) sd_event_add_time_relative(e, &event->timeout_event, CLOCK_MONOTONIC, | |
358 | manager->timeout_usec, USEC_PER_SEC, | |
359 | on_event_timeout, event); | |
360 | } | |
361 | ||
362 | static int worker_spawn(Manager *manager, Event *event) { | |
363 | _cleanup_(sd_device_monitor_unrefp) sd_device_monitor *worker_monitor = NULL; | |
364 | Worker *worker; | |
365 | pid_t pid; | |
366 | int r; | |
367 | ||
368 | /* listen for new events */ | |
369 | r = device_monitor_new_full(&worker_monitor, MONITOR_GROUP_NONE, -1); | |
370 | if (r < 0) | |
371 | return r; | |
372 | ||
373 | (void) sd_device_monitor_set_description(worker_monitor, "worker"); | |
374 | ||
375 | /* allow the main daemon netlink address to send devices to the worker */ | |
376 | r = device_monitor_allow_unicast_sender(worker_monitor, manager->monitor); | |
377 | if (r < 0) | |
378 | return log_error_errno(r, "Worker: Failed to set unicast sender: %m"); | |
379 | ||
380 | r = device_monitor_enable_receiving(worker_monitor); | |
381 | if (r < 0) | |
382 | return log_error_errno(r, "Worker: Failed to enable receiving of device: %m"); | |
383 | ||
384 | r = safe_fork("(udev-worker)", FORK_DEATHSIG, &pid); | |
385 | if (r < 0) { | |
386 | event->state = EVENT_QUEUED; | |
387 | return log_error_errno(r, "Failed to fork() worker: %m"); | |
388 | } | |
389 | if (r == 0) { | |
390 | _cleanup_(udev_worker_done) UdevWorker w = { | |
391 | .monitor = TAKE_PTR(worker_monitor), | |
392 | .properties = TAKE_PTR(manager->properties), | |
393 | .rules = TAKE_PTR(manager->rules), | |
394 | .pipe_fd = TAKE_FD(manager->worker_watch[WRITE_END]), | |
395 | .inotify_fd = TAKE_FD(manager->inotify_fd), | |
396 | .exec_delay_usec = manager->exec_delay_usec, | |
397 | .timeout_usec = manager->timeout_usec, | |
398 | .timeout_signal = manager->timeout_signal, | |
399 | .log_level = manager->log_level, | |
400 | .blockdev_read_only = manager->blockdev_read_only, | |
401 | }; | |
402 | ||
403 | /* Worker process */ | |
404 | r = udev_worker_main(&w, event->dev); | |
405 | log_close(); | |
406 | _exit(r < 0 ? EXIT_FAILURE : EXIT_SUCCESS); | |
407 | } | |
408 | ||
409 | r = worker_new(&worker, manager, worker_monitor, pid); | |
410 | if (r < 0) | |
411 | return log_error_errno(r, "Failed to create worker object: %m"); | |
412 | ||
413 | worker_attach_event(worker, event); | |
414 | ||
415 | log_device_debug(event->dev, "Worker ["PID_FMT"] is forked for processing SEQNUM=%"PRIu64".", pid, event->seqnum); | |
416 | return 0; | |
417 | } | |
418 | ||
419 | static int event_run(Event *event) { | |
420 | static bool log_children_max_reached = true; | |
421 | Manager *manager; | |
422 | Worker *worker; | |
423 | int r; | |
424 | ||
425 | assert(event); | |
426 | assert(event->manager); | |
427 | ||
428 | log_device_uevent(event->dev, "Device ready for processing"); | |
429 | ||
430 | (void) event_source_disable(event->retry_event_source); | |
431 | ||
432 | manager = event->manager; | |
433 | HASHMAP_FOREACH(worker, manager->workers) { | |
434 | if (worker->state != WORKER_IDLE) | |
435 | continue; | |
436 | ||
437 | r = device_monitor_send_device(manager->monitor, worker->monitor, event->dev); | |
438 | if (r < 0) { | |
439 | log_device_error_errno(event->dev, r, "Worker ["PID_FMT"] did not accept message, killing the worker: %m", | |
440 | worker->pid); | |
441 | (void) kill(worker->pid, SIGKILL); | |
442 | worker->state = WORKER_KILLED; | |
443 | continue; | |
444 | } | |
445 | worker_attach_event(worker, event); | |
446 | return 1; /* event is now processing. */ | |
447 | } | |
448 | ||
449 | if (hashmap_size(manager->workers) >= manager->children_max) { | |
450 | /* Avoid spamming the debug logs if the limit is already reached and | |
451 | * many events still need to be processed */ | |
452 | if (log_children_max_reached && manager->children_max > 1) { | |
453 | log_debug("Maximum number (%u) of children reached.", hashmap_size(manager->workers)); | |
454 | log_children_max_reached = false; | |
455 | } | |
456 | return 0; /* no free worker */ | |
457 | } | |
458 | ||
459 | /* Re-enable the debug message for the next batch of events */ | |
460 | log_children_max_reached = true; | |
461 | ||
462 | /* start new worker and pass initial device */ | |
463 | r = worker_spawn(manager, event); | |
464 | if (r < 0) | |
465 | return r; | |
466 | ||
467 | return 1; /* event is now processing. */ | |
468 | } | |
469 | ||
470 | bool devpath_conflict(const char *a, const char *b) { | |
471 | /* This returns true when two paths are equivalent, or one is a child of another. */ | |
472 | ||
473 | if (!a || !b) | |
474 | return false; | |
475 | ||
476 | for (; *a != '\0' && *b != '\0'; a++, b++) | |
477 | if (*a != *b) | |
478 | return false; | |
479 | ||
480 | return *a == '/' || *b == '/' || *a == *b; | |
481 | } | |
482 | ||
483 | static int event_is_blocked(Event *event) { | |
484 | Event *loop_event = NULL; | |
485 | int r; | |
486 | ||
487 | /* lookup event for identical, parent, child device */ | |
488 | ||
489 | assert(event); | |
490 | assert(event->manager); | |
491 | assert(event->blocker_seqnum <= event->seqnum); | |
492 | ||
493 | if (event->retry_again_next_usec > 0) { | |
494 | usec_t now_usec; | |
495 | ||
496 | r = sd_event_now(event->manager->event, CLOCK_BOOTTIME, &now_usec); | |
497 | if (r < 0) | |
498 | return r; | |
499 | ||
500 | if (event->retry_again_next_usec > now_usec) | |
501 | return true; | |
502 | } | |
503 | ||
504 | if (event->blocker_seqnum == event->seqnum) | |
505 | /* we have checked previously and no blocker found */ | |
506 | return false; | |
507 | ||
508 | LIST_FOREACH(event, e, event->manager->events) { | |
509 | loop_event = e; | |
510 | ||
511 | /* we already found a later event, earlier cannot block us, no need to check again */ | |
512 | if (loop_event->seqnum < event->blocker_seqnum) | |
513 | continue; | |
514 | ||
515 | /* event we checked earlier still exists, no need to check again */ | |
516 | if (loop_event->seqnum == event->blocker_seqnum) | |
517 | return true; | |
518 | ||
519 | /* found ourself, no later event can block us */ | |
520 | if (loop_event->seqnum >= event->seqnum) | |
521 | goto no_blocker; | |
522 | ||
523 | /* found event we have not checked */ | |
524 | break; | |
525 | } | |
526 | ||
527 | assert(loop_event); | |
528 | assert(loop_event->seqnum > event->blocker_seqnum && | |
529 | loop_event->seqnum < event->seqnum); | |
530 | ||
531 | /* check if queue contains events we depend on */ | |
532 | LIST_FOREACH(event, e, loop_event) { | |
533 | loop_event = e; | |
534 | ||
535 | /* found ourself, no later event can block us */ | |
536 | if (loop_event->seqnum >= event->seqnum) | |
537 | goto no_blocker; | |
538 | ||
539 | if (streq_ptr(loop_event->id, event->id)) | |
540 | break; | |
541 | ||
542 | if (devpath_conflict(event->devpath, loop_event->devpath) || | |
543 | devpath_conflict(event->devpath, loop_event->devpath_old) || | |
544 | devpath_conflict(event->devpath_old, loop_event->devpath)) | |
545 | break; | |
546 | ||
547 | if (event->devnode && streq_ptr(event->devnode, loop_event->devnode)) | |
548 | break; | |
549 | } | |
550 | ||
551 | assert(loop_event); | |
552 | ||
553 | log_device_debug(event->dev, "SEQNUM=%" PRIu64 " blocked by SEQNUM=%" PRIu64, | |
554 | event->seqnum, loop_event->seqnum); | |
555 | ||
556 | event->blocker_seqnum = loop_event->seqnum; | |
557 | return true; | |
558 | ||
559 | no_blocker: | |
560 | event->blocker_seqnum = event->seqnum; | |
561 | return false; | |
562 | } | |
563 | ||
564 | static int event_queue_start(Manager *manager) { | |
565 | int r; | |
566 | ||
567 | assert(manager); | |
568 | ||
569 | if (!manager->events || manager->exit || manager->stop_exec_queue) | |
570 | return 0; | |
571 | ||
572 | /* To make the stack directory /run/udev/links cleaned up later. */ | |
573 | manager->udev_node_needs_cleanup = true; | |
574 | ||
575 | r = event_source_disable(manager->kill_workers_event); | |
576 | if (r < 0) | |
577 | log_warning_errno(r, "Failed to disable event source for cleaning up idle workers, ignoring: %m"); | |
578 | ||
579 | manager_reload(manager, /* force = */ false); | |
580 | ||
581 | LIST_FOREACH(event, event, manager->events) { | |
582 | if (event->state != EVENT_QUEUED) | |
583 | continue; | |
584 | ||
585 | /* do not start event if parent or child event is still running or queued */ | |
586 | r = event_is_blocked(event); | |
587 | if (r > 0) | |
588 | continue; | |
589 | if (r < 0) | |
590 | log_device_warning_errno(event->dev, r, | |
591 | "Failed to check dependencies for event (SEQNUM=%"PRIu64", ACTION=%s), " | |
592 | "assuming there is no blocking event, ignoring: %m", | |
593 | event->seqnum, | |
594 | strna(device_action_to_string(event->action))); | |
595 | ||
596 | r = event_run(event); | |
597 | if (r <= 0) /* 0 means there are no idle workers. Let's escape from the loop. */ | |
598 | return r; | |
599 | } | |
600 | ||
601 | return 0; | |
602 | } | |
603 | ||
604 | static int on_event_retry(sd_event_source *s, uint64_t usec, void *userdata) { | |
605 | /* This does nothing. The on_post() callback will start the event if there exists an idle worker. */ | |
606 | return 1; | |
607 | } | |
608 | ||
609 | static int event_requeue(Event *event) { | |
610 | usec_t now_usec; | |
611 | int r; | |
612 | ||
613 | assert(event); | |
614 | assert(event->manager); | |
615 | assert(event->manager->event); | |
616 | ||
617 | event->timeout_warning_event = sd_event_source_disable_unref(event->timeout_warning_event); | |
618 | event->timeout_event = sd_event_source_disable_unref(event->timeout_event); | |
619 | ||
620 | /* add a short delay to suppress busy loop */ | |
621 | r = sd_event_now(event->manager->event, CLOCK_BOOTTIME, &now_usec); | |
622 | if (r < 0) | |
623 | return log_device_warning_errno(event->dev, r, | |
624 | "Failed to get current time, " | |
625 | "skipping event (SEQNUM=%"PRIu64", ACTION=%s): %m", | |
626 | event->seqnum, strna(device_action_to_string(event->action))); | |
627 | ||
628 | if (event->retry_again_timeout_usec > 0 && event->retry_again_timeout_usec <= now_usec) | |
629 | return log_device_warning_errno(event->dev, SYNTHETIC_ERRNO(ETIMEDOUT), | |
630 | "The underlying block device is locked by a process more than %s, " | |
631 | "skipping event (SEQNUM=%"PRIu64", ACTION=%s).", | |
632 | FORMAT_TIMESPAN(EVENT_RETRY_TIMEOUT_USEC, USEC_PER_MINUTE), | |
633 | event->seqnum, strna(device_action_to_string(event->action))); | |
634 | ||
635 | event->retry_again_next_usec = usec_add(now_usec, EVENT_RETRY_INTERVAL_USEC); | |
636 | if (event->retry_again_timeout_usec == 0) | |
637 | event->retry_again_timeout_usec = usec_add(now_usec, EVENT_RETRY_TIMEOUT_USEC); | |
638 | ||
639 | r = event_reset_time_relative(event->manager->event, &event->retry_event_source, | |
640 | CLOCK_MONOTONIC, EVENT_RETRY_INTERVAL_USEC, 0, | |
641 | on_event_retry, NULL, | |
642 | 0, "retry-event", true); | |
643 | if (r < 0) | |
644 | return log_device_warning_errno(event->dev, r, "Failed to reset timer event source for retrying event, " | |
645 | "skipping event (SEQNUM=%"PRIu64", ACTION=%s): %m", | |
646 | event->seqnum, strna(device_action_to_string(event->action))); | |
647 | ||
648 | if (event->worker && event->worker->event == event) | |
649 | event->worker->event = NULL; | |
650 | event->worker = NULL; | |
651 | ||
652 | event->state = EVENT_QUEUED; | |
653 | return 0; | |
654 | } | |
655 | ||
656 | static int event_queue_assume_block_device_unlocked(Manager *manager, sd_device *dev) { | |
657 | const char *devname; | |
658 | int r; | |
659 | ||
660 | /* When a new event for a block device is queued or we get an inotify event, assume that the | |
661 | * device is not locked anymore. The assumption may not be true, but that should not cause any | |
662 | * issues, as in that case events will be requeued soon. */ | |
663 | ||
664 | r = udev_get_whole_disk(dev, NULL, &devname); | |
665 | if (r <= 0) | |
666 | return r; | |
667 | ||
668 | LIST_FOREACH(event, event, manager->events) { | |
669 | const char *event_devname; | |
670 | ||
671 | if (event->state != EVENT_QUEUED) | |
672 | continue; | |
673 | ||
674 | if (event->retry_again_next_usec == 0) | |
675 | continue; | |
676 | ||
677 | if (udev_get_whole_disk(event->dev, NULL, &event_devname) <= 0) | |
678 | continue; | |
679 | ||
680 | if (!streq(devname, event_devname)) | |
681 | continue; | |
682 | ||
683 | event->retry_again_next_usec = 0; | |
684 | } | |
685 | ||
686 | return 0; | |
687 | } | |
688 | ||
689 | static int event_queue_insert(Manager *manager, sd_device *dev) { | |
690 | const char *devpath, *devpath_old = NULL, *id = NULL, *devnode = NULL; | |
691 | sd_device_action_t action; | |
692 | uint64_t seqnum; | |
693 | Event *event; | |
694 | int r; | |
695 | ||
696 | assert(manager); | |
697 | assert(dev); | |
698 | ||
699 | /* We only accepts devices received by device monitor. */ | |
700 | r = sd_device_get_seqnum(dev, &seqnum); | |
701 | if (r < 0) | |
702 | return r; | |
703 | ||
704 | r = sd_device_get_action(dev, &action); | |
705 | if (r < 0) | |
706 | return r; | |
707 | ||
708 | r = sd_device_get_devpath(dev, &devpath); | |
709 | if (r < 0) | |
710 | return r; | |
711 | ||
712 | r = sd_device_get_property_value(dev, "DEVPATH_OLD", &devpath_old); | |
713 | if (r < 0 && r != -ENOENT) | |
714 | return r; | |
715 | ||
716 | r = device_get_device_id(dev, &id); | |
717 | if (r < 0 && r != -ENOENT) | |
718 | return r; | |
719 | ||
720 | r = sd_device_get_devname(dev, &devnode); | |
721 | if (r < 0 && r != -ENOENT) | |
722 | return r; | |
723 | ||
724 | event = new(Event, 1); | |
725 | if (!event) | |
726 | return -ENOMEM; | |
727 | ||
728 | *event = (Event) { | |
729 | .manager = manager, | |
730 | .dev = sd_device_ref(dev), | |
731 | .seqnum = seqnum, | |
732 | .action = action, | |
733 | .id = id, | |
734 | .devpath = devpath, | |
735 | .devpath_old = devpath_old, | |
736 | .devnode = devnode, | |
737 | .state = EVENT_QUEUED, | |
738 | }; | |
739 | ||
740 | if (!manager->events) { | |
741 | r = touch("/run/udev/queue"); | |
742 | if (r < 0) | |
743 | log_warning_errno(r, "Failed to touch /run/udev/queue, ignoring: %m"); | |
744 | } | |
745 | ||
746 | LIST_APPEND(event, manager->events, event); | |
747 | ||
748 | log_device_uevent(dev, "Device is queued"); | |
749 | ||
750 | return 0; | |
751 | } | |
752 | ||
753 | static int on_uevent(sd_device_monitor *monitor, sd_device *dev, void *userdata) { | |
754 | Manager *manager = ASSERT_PTR(userdata); | |
755 | int r; | |
756 | ||
757 | DEVICE_TRACE_POINT(kernel_uevent_received, dev); | |
758 | ||
759 | device_ensure_usec_initialized(dev, NULL); | |
760 | ||
761 | r = event_queue_insert(manager, dev); | |
762 | if (r < 0) { | |
763 | log_device_error_errno(dev, r, "Failed to insert device into event queue: %m"); | |
764 | return 1; | |
765 | } | |
766 | ||
767 | (void) event_queue_assume_block_device_unlocked(manager, dev); | |
768 | ||
769 | return 1; | |
770 | } | |
771 | ||
772 | static int on_worker(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
773 | Manager *manager = ASSERT_PTR(userdata); | |
774 | ||
775 | for (;;) { | |
776 | EventResult result; | |
777 | struct iovec iovec = IOVEC_MAKE(&result, sizeof(result)); | |
778 | CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(struct ucred))) control; | |
779 | struct msghdr msghdr = { | |
780 | .msg_iov = &iovec, | |
781 | .msg_iovlen = 1, | |
782 | .msg_control = &control, | |
783 | .msg_controllen = sizeof(control), | |
784 | }; | |
785 | ssize_t size; | |
786 | struct ucred *ucred; | |
787 | Worker *worker; | |
788 | ||
789 | size = recvmsg_safe(fd, &msghdr, MSG_DONTWAIT); | |
790 | if (size == -EINTR) | |
791 | continue; | |
792 | if (size == -EAGAIN) | |
793 | /* nothing more to read */ | |
794 | break; | |
795 | if (size < 0) | |
796 | return log_error_errno(size, "Failed to receive message: %m"); | |
797 | ||
798 | cmsg_close_all(&msghdr); | |
799 | ||
800 | if (size != sizeof(result)) { | |
801 | log_warning("Ignoring worker message with invalid size %zi bytes", size); | |
802 | continue; | |
803 | } | |
804 | ||
805 | ucred = CMSG_FIND_DATA(&msghdr, SOL_SOCKET, SCM_CREDENTIALS, struct ucred); | |
806 | if (!ucred || ucred->pid <= 0) { | |
807 | log_warning("Ignoring worker message without valid PID"); | |
808 | continue; | |
809 | } | |
810 | ||
811 | /* lookup worker who sent the signal */ | |
812 | worker = hashmap_get(manager->workers, PID_TO_PTR(ucred->pid)); | |
813 | if (!worker) { | |
814 | log_debug("Worker ["PID_FMT"] returned, but is no longer tracked", ucred->pid); | |
815 | continue; | |
816 | } | |
817 | ||
818 | if (worker->state == WORKER_KILLING) { | |
819 | worker->state = WORKER_KILLED; | |
820 | (void) kill(worker->pid, SIGTERM); | |
821 | } else if (worker->state != WORKER_KILLED) | |
822 | worker->state = WORKER_IDLE; | |
823 | ||
824 | /* worker returned */ | |
825 | if (result == EVENT_RESULT_TRY_AGAIN && | |
826 | event_requeue(worker->event) < 0) | |
827 | udev_broadcast_result(manager->monitor, worker->event->dev, -ETIMEDOUT); | |
828 | ||
829 | /* When event_requeue() succeeds, worker->event is NULL, and event_free() handles NULL gracefully. */ | |
830 | event_free(worker->event); | |
831 | } | |
832 | ||
833 | return 1; | |
834 | } | |
835 | ||
ce5ddbc4 YW |
836 | static void manager_set_default_children_max(Manager *manager) { |
837 | uint64_t cpu_limit, mem_limit, cpu_count = 1; | |
838 | int r; | |
839 | ||
840 | assert(manager); | |
841 | ||
842 | if (manager->children_max != 0) | |
843 | return; | |
844 | ||
845 | r = cpus_in_affinity_mask(); | |
846 | if (r < 0) | |
847 | log_warning_errno(r, "Failed to determine number of local CPUs, ignoring: %m"); | |
848 | else | |
849 | cpu_count = r; | |
850 | ||
851 | cpu_limit = cpu_count * 2 + 16; | |
852 | mem_limit = MAX(physical_memory() / (128*1024*1024), UINT64_C(10)); | |
853 | ||
854 | manager->children_max = MIN3(cpu_limit, mem_limit, WORKER_NUM_MAX); | |
855 | log_debug("Set children_max to %u", manager->children_max); | |
856 | } | |
857 | ||
81c32b1d YW |
858 | /* receive the udevd message from userspace */ |
859 | static int on_ctrl_msg(UdevCtrl *uctrl, UdevCtrlMessageType type, const UdevCtrlMessageValue *value, void *userdata) { | |
860 | Manager *manager = ASSERT_PTR(userdata); | |
861 | int r; | |
862 | ||
863 | assert(value); | |
864 | ||
865 | switch (type) { | |
866 | case UDEV_CTRL_SET_LOG_LEVEL: | |
867 | if ((value->intval & LOG_PRIMASK) != value->intval) { | |
868 | log_debug("Received invalid udev control message (SET_LOG_LEVEL, %i), ignoring.", value->intval); | |
869 | break; | |
870 | } | |
871 | ||
872 | log_debug("Received udev control message (SET_LOG_LEVEL), setting log_level=%i", value->intval); | |
873 | ||
874 | r = log_get_max_level(); | |
875 | if (r == value->intval) | |
876 | break; | |
877 | ||
878 | log_set_max_level(value->intval); | |
879 | manager->log_level = value->intval; | |
880 | manager_kill_workers(manager, false); | |
881 | break; | |
882 | case UDEV_CTRL_STOP_EXEC_QUEUE: | |
883 | log_debug("Received udev control message (STOP_EXEC_QUEUE)"); | |
884 | manager->stop_exec_queue = true; | |
885 | break; | |
886 | case UDEV_CTRL_START_EXEC_QUEUE: | |
887 | log_debug("Received udev control message (START_EXEC_QUEUE)"); | |
888 | manager->stop_exec_queue = false; | |
889 | /* It is not necessary to call event_queue_start() here, as it will be called in on_post() if necessary. */ | |
890 | break; | |
891 | case UDEV_CTRL_RELOAD: | |
892 | log_debug("Received udev control message (RELOAD)"); | |
893 | manager_reload(manager, /* force = */ true); | |
894 | break; | |
895 | case UDEV_CTRL_SET_ENV: { | |
896 | _unused_ _cleanup_free_ char *old_val = NULL; | |
897 | _cleanup_free_ char *key = NULL, *val = NULL, *old_key = NULL; | |
898 | const char *eq; | |
899 | ||
900 | eq = strchr(value->buf, '='); | |
901 | if (!eq) { | |
902 | log_error("Invalid key format '%s'", value->buf); | |
903 | return 1; | |
904 | } | |
905 | ||
906 | key = strndup(value->buf, eq - value->buf); | |
907 | if (!key) { | |
908 | log_oom(); | |
909 | return 1; | |
910 | } | |
911 | ||
912 | old_val = hashmap_remove2(manager->properties, key, (void **) &old_key); | |
913 | ||
914 | r = hashmap_ensure_allocated(&manager->properties, &string_hash_ops); | |
915 | if (r < 0) { | |
916 | log_oom(); | |
917 | return 1; | |
918 | } | |
919 | ||
920 | eq++; | |
921 | if (isempty(eq)) { | |
922 | log_debug("Received udev control message (ENV), unsetting '%s'", key); | |
923 | ||
924 | r = hashmap_put(manager->properties, key, NULL); | |
925 | if (r < 0) { | |
926 | log_oom(); | |
927 | return 1; | |
928 | } | |
929 | } else { | |
930 | val = strdup(eq); | |
931 | if (!val) { | |
932 | log_oom(); | |
933 | return 1; | |
934 | } | |
935 | ||
936 | log_debug("Received udev control message (ENV), setting '%s=%s'", key, val); | |
937 | ||
938 | r = hashmap_put(manager->properties, key, val); | |
939 | if (r < 0) { | |
940 | log_oom(); | |
941 | return 1; | |
942 | } | |
943 | } | |
944 | ||
945 | key = val = NULL; | |
946 | manager_kill_workers(manager, false); | |
947 | break; | |
948 | } | |
949 | case UDEV_CTRL_SET_CHILDREN_MAX: | |
2cba1d37 | 950 | if (value->intval < 0) { |
81c32b1d YW |
951 | log_debug("Received invalid udev control message (SET_MAX_CHILDREN, %i), ignoring.", value->intval); |
952 | return 0; | |
953 | } | |
954 | ||
955 | log_debug("Received udev control message (SET_MAX_CHILDREN), setting children_max=%i", value->intval); | |
956 | manager->children_max = value->intval; | |
957 | ||
2cba1d37 YW |
958 | /* When 0 is specified, determine the maximum based on the system resources. */ |
959 | manager_set_default_children_max(manager); | |
960 | ||
81c32b1d YW |
961 | notify_ready(manager); |
962 | break; | |
963 | case UDEV_CTRL_PING: | |
964 | log_debug("Received udev control message (PING)"); | |
965 | break; | |
966 | case UDEV_CTRL_EXIT: | |
967 | log_debug("Received udev control message (EXIT)"); | |
968 | manager_exit(manager); | |
969 | break; | |
970 | default: | |
971 | log_debug("Received unknown udev control message, ignoring"); | |
972 | } | |
973 | ||
974 | return 1; | |
975 | } | |
976 | ||
977 | static int synthesize_change_one(sd_device *dev, sd_device *target) { | |
978 | int r; | |
979 | ||
980 | if (DEBUG_LOGGING) { | |
981 | const char *syspath = NULL; | |
982 | (void) sd_device_get_syspath(target, &syspath); | |
983 | log_device_debug(dev, "device is closed, synthesising 'change' on %s", strna(syspath)); | |
984 | } | |
985 | ||
986 | r = sd_device_trigger(target, SD_DEVICE_CHANGE); | |
987 | if (r < 0) | |
988 | return log_device_debug_errno(target, r, "Failed to trigger 'change' uevent: %m"); | |
989 | ||
990 | DEVICE_TRACE_POINT(synthetic_change_event, dev); | |
991 | ||
992 | return 0; | |
993 | } | |
994 | ||
995 | static int synthesize_change(sd_device *dev) { | |
996 | _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL; | |
997 | bool part_table_read; | |
998 | const char *sysname; | |
999 | int r, k; | |
1000 | ||
1001 | r = sd_device_get_sysname(dev, &sysname); | |
1002 | if (r < 0) | |
1003 | return r; | |
1004 | ||
1005 | if (startswith(sysname, "dm-") || block_device_is_whole_disk(dev) <= 0) | |
1006 | return synthesize_change_one(dev, dev); | |
1007 | ||
1008 | r = blockdev_reread_partition_table(dev); | |
1009 | if (r < 0) | |
1010 | log_device_debug_errno(dev, r, "Failed to re-read partition table, ignoring: %m"); | |
1011 | part_table_read = r >= 0; | |
1012 | ||
1013 | /* search for partitions */ | |
1014 | r = partition_enumerator_new(dev, &e); | |
1015 | if (r < 0) | |
1016 | return r; | |
1017 | ||
1018 | /* We have partitions and re-read the table, the kernel already sent out a "change" | |
1019 | * event for the disk, and "remove/add" for all partitions. */ | |
1020 | if (part_table_read && sd_device_enumerator_get_device_first(e)) | |
1021 | return 0; | |
1022 | ||
1023 | /* We have partitions but re-reading the partition table did not work, synthesize | |
1024 | * "change" for the disk and all partitions. */ | |
1025 | r = synthesize_change_one(dev, dev); | |
1026 | FOREACH_DEVICE(e, d) { | |
1027 | k = synthesize_change_one(dev, d); | |
1028 | if (k < 0 && r >= 0) | |
1029 | r = k; | |
1030 | } | |
1031 | ||
1032 | return r; | |
1033 | } | |
1034 | ||
1035 | static int on_inotify(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
1036 | Manager *manager = ASSERT_PTR(userdata); | |
1037 | union inotify_event_buffer buffer; | |
1038 | ssize_t l; | |
1039 | int r; | |
1040 | ||
1041 | l = read(fd, &buffer, sizeof(buffer)); | |
1042 | if (l < 0) { | |
1043 | if (ERRNO_IS_TRANSIENT(errno)) | |
1044 | return 0; | |
1045 | ||
1046 | return log_error_errno(errno, "Failed to read inotify fd: %m"); | |
1047 | } | |
1048 | ||
1049 | FOREACH_INOTIFY_EVENT_WARN(e, buffer, l) { | |
1050 | _cleanup_(sd_device_unrefp) sd_device *dev = NULL; | |
1051 | const char *devnode; | |
1052 | ||
1053 | /* Do not handle IN_IGNORED here. Especially, do not try to call udev_watch_end() from the | |
1054 | * main process. Otherwise, the pair of the symlinks may become inconsistent, and several | |
1055 | * garbage may remain. The old symlinks are removed by a worker that processes the | |
1056 | * corresponding 'remove' uevent; | |
1057 | * udev_event_execute_rules() -> event_execute_rules_on_remove() -> udev_watch_end(). */ | |
1058 | ||
1059 | if (!FLAGS_SET(e->mask, IN_CLOSE_WRITE)) | |
1060 | continue; | |
1061 | ||
1062 | r = device_new_from_watch_handle(&dev, e->wd); | |
1063 | if (r < 0) { | |
1064 | /* Device may be removed just after closed. */ | |
1065 | log_debug_errno(r, "Failed to create sd_device object from watch handle, ignoring: %m"); | |
1066 | continue; | |
1067 | } | |
1068 | ||
1069 | r = sd_device_get_devname(dev, &devnode); | |
1070 | if (r < 0) { | |
1071 | /* Also here, device may be already removed. */ | |
1072 | log_device_debug_errno(dev, r, "Failed to get device node, ignoring: %m"); | |
1073 | continue; | |
1074 | } | |
1075 | ||
1076 | log_device_debug(dev, "Received inotify event for %s.", devnode); | |
1077 | ||
1078 | (void) event_queue_assume_block_device_unlocked(manager, dev); | |
1079 | (void) synthesize_change(dev); | |
1080 | } | |
1081 | ||
1082 | return 0; | |
1083 | } | |
1084 | ||
1085 | static int on_sigterm(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { | |
1086 | Manager *manager = ASSERT_PTR(userdata); | |
1087 | ||
1088 | manager_exit(manager); | |
1089 | ||
1090 | return 1; | |
1091 | } | |
1092 | ||
1093 | static int on_sighup(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { | |
1094 | Manager *manager = ASSERT_PTR(userdata); | |
1095 | ||
1096 | manager_reload(manager, /* force = */ true); | |
1097 | ||
1098 | return 1; | |
1099 | } | |
1100 | ||
1101 | static int on_sigchld(sd_event_source *s, const siginfo_t *si, void *userdata) { | |
1102 | Worker *worker = ASSERT_PTR(userdata); | |
1103 | Manager *manager = ASSERT_PTR(worker->manager); | |
1104 | sd_device *dev = worker->event ? ASSERT_PTR(worker->event->dev) : NULL; | |
1105 | EventResult result; | |
1106 | ||
1107 | assert(si); | |
1108 | ||
1109 | switch (si->si_code) { | |
1110 | case CLD_EXITED: | |
1111 | if (si->si_status == 0) | |
1112 | log_device_debug(dev, "Worker ["PID_FMT"] exited.", si->si_pid); | |
1113 | else | |
1114 | log_device_warning(dev, "Worker ["PID_FMT"] exited with return code %i.", | |
1115 | si->si_pid, si->si_status); | |
1116 | result = EVENT_RESULT_EXIT_STATUS_BASE + si->si_status; | |
1117 | break; | |
1118 | ||
1119 | case CLD_KILLED: | |
1120 | case CLD_DUMPED: | |
1121 | log_device_warning(dev, "Worker ["PID_FMT"] terminated by signal %i (%s).", | |
1122 | si->si_pid, si->si_status, signal_to_string(si->si_status)); | |
1123 | result = EVENT_RESULT_SIGNAL_BASE + si->si_status; | |
1124 | break; | |
1125 | ||
1126 | default: | |
1127 | assert_not_reached(); | |
1128 | } | |
1129 | ||
1130 | if (result != EVENT_RESULT_SUCCESS && dev) { | |
1131 | /* delete state from disk */ | |
1132 | device_delete_db(dev); | |
1133 | device_tag_index(dev, NULL, false); | |
1134 | ||
1135 | /* Forward kernel event to libudev listeners */ | |
1136 | udev_broadcast_result(manager->monitor, dev, result); | |
1137 | } | |
1138 | ||
1139 | worker_free(worker); | |
1140 | ||
1141 | return 1; | |
1142 | } | |
1143 | ||
1144 | static int on_post(sd_event_source *s, void *userdata) { | |
1145 | Manager *manager = ASSERT_PTR(userdata); | |
1146 | ||
1147 | if (manager->events) { | |
1148 | /* Try to process pending events if idle workers exist. Why is this necessary? | |
1149 | * When a worker finished an event and became idle, even if there was a pending event, | |
1150 | * the corresponding device might have been locked and the processing of the event | |
1151 | * delayed for a while, preventing the worker from processing the event immediately. | |
1152 | * Now, the device may be unlocked. Let's try again! */ | |
1153 | event_queue_start(manager); | |
1154 | return 1; | |
1155 | } | |
1156 | ||
1157 | /* There are no queued events. Let's remove /run/udev/queue and clean up the idle processes. */ | |
1158 | ||
1159 | if (unlink("/run/udev/queue") < 0) { | |
1160 | if (errno != ENOENT) | |
1161 | log_warning_errno(errno, "Failed to unlink /run/udev/queue, ignoring: %m"); | |
1162 | } else | |
1163 | log_debug("No events are queued, removing /run/udev/queue."); | |
1164 | ||
1165 | if (!hashmap_isempty(manager->workers)) { | |
1166 | /* There are idle workers */ | |
1167 | (void) event_reset_time_relative(manager->event, &manager->kill_workers_event, | |
1168 | CLOCK_MONOTONIC, 3 * USEC_PER_SEC, USEC_PER_SEC, | |
1169 | on_kill_workers_event, manager, | |
1170 | 0, "kill-workers-event", false); | |
1171 | return 1; | |
1172 | } | |
1173 | ||
1174 | /* There are no idle workers. */ | |
1175 | ||
1176 | if (manager->udev_node_needs_cleanup) { | |
1177 | (void) udev_node_cleanup(); | |
1178 | manager->udev_node_needs_cleanup = false; | |
1179 | } | |
1180 | ||
1181 | if (manager->exit) | |
1182 | return sd_event_exit(manager->event, 0); | |
1183 | ||
1184 | if (manager->cgroup) | |
1185 | /* cleanup possible left-over processes in our cgroup */ | |
bd1791b5 | 1186 | (void) cg_kill(manager->cgroup, SIGKILL, CGROUP_IGNORE_SELF, /* set=*/ NULL, /* kill_log= */ NULL, /* userdata= */ NULL); |
81c32b1d YW |
1187 | |
1188 | return 1; | |
1189 | } | |
1190 | ||
1191 | Manager* manager_new(void) { | |
1192 | Manager *manager; | |
1193 | ||
1194 | manager = new(Manager, 1); | |
1195 | if (!manager) | |
1196 | return NULL; | |
1197 | ||
1198 | *manager = (Manager) { | |
1199 | .inotify_fd = -EBADF, | |
71136404 | 1200 | .worker_watch = EBADF_PAIR, |
81c32b1d YW |
1201 | .log_level = LOG_INFO, |
1202 | .resolve_name_timing = RESOLVE_NAME_EARLY, | |
1203 | .timeout_usec = 180 * USEC_PER_SEC, | |
1204 | .timeout_signal = SIGKILL, | |
1205 | }; | |
1206 | ||
1207 | return manager; | |
1208 | } | |
1209 | ||
1210 | int manager_init(Manager *manager, int fd_ctrl, int fd_uevent) { | |
1211 | _cleanup_free_ char *cgroup = NULL; | |
1212 | int r; | |
1213 | ||
1214 | assert(manager); | |
1215 | ||
1216 | r = udev_ctrl_new_from_fd(&manager->ctrl, fd_ctrl); | |
1217 | if (r < 0) | |
1218 | return log_error_errno(r, "Failed to initialize udev control socket: %m"); | |
1219 | ||
1220 | r = udev_ctrl_enable_receiving(manager->ctrl); | |
1221 | if (r < 0) | |
1222 | return log_error_errno(r, "Failed to bind udev control socket: %m"); | |
1223 | ||
1224 | r = device_monitor_new_full(&manager->monitor, MONITOR_GROUP_KERNEL, fd_uevent); | |
1225 | if (r < 0) | |
1226 | return log_error_errno(r, "Failed to initialize device monitor: %m"); | |
1227 | ||
1228 | /* Bump receiver buffer, but only if we are not called via socket activation, as in that | |
1229 | * case systemd sets the receive buffer size for us, and the value in the .socket unit | |
1230 | * should take full effect. */ | |
1231 | if (fd_uevent < 0) { | |
1232 | r = sd_device_monitor_set_receive_buffer_size(manager->monitor, 128 * 1024 * 1024); | |
1233 | if (r < 0) | |
1234 | log_warning_errno(r, "Failed to set receive buffer size for device monitor, ignoring: %m"); | |
1235 | } | |
1236 | ||
1237 | (void) sd_device_monitor_set_description(manager->monitor, "manager"); | |
1238 | ||
1239 | r = device_monitor_enable_receiving(manager->monitor); | |
1240 | if (r < 0) | |
1241 | return log_error_errno(r, "Failed to bind netlink socket: %m"); | |
1242 | ||
1243 | manager->log_level = log_get_max_level(); | |
1244 | ||
1245 | r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 0, &cgroup); | |
1246 | if (r < 0) | |
1247 | log_debug_errno(r, "Failed to get cgroup, ignoring: %m"); | |
1248 | else if (endswith(cgroup, "/udev")) { /* If we are in a subcgroup /udev/ we assume it was delegated to us */ | |
1249 | log_debug("Running in delegated subcgroup '%s'.", cgroup); | |
1250 | manager->cgroup = TAKE_PTR(cgroup); | |
1251 | } | |
1252 | ||
1253 | return 0; | |
1254 | } | |
1255 | ||
1256 | int manager_main(Manager *manager) { | |
1257 | int fd_worker, r; | |
1258 | ||
ce5ddbc4 YW |
1259 | manager_set_default_children_max(manager); |
1260 | ||
81c32b1d YW |
1261 | /* unnamed socket from workers to the main daemon */ |
1262 | r = socketpair(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0, manager->worker_watch); | |
1263 | if (r < 0) | |
1264 | return log_error_errno(errno, "Failed to create socketpair for communicating with workers: %m"); | |
1265 | ||
1266 | fd_worker = manager->worker_watch[READ_END]; | |
1267 | ||
1268 | r = setsockopt_int(fd_worker, SOL_SOCKET, SO_PASSCRED, true); | |
1269 | if (r < 0) | |
1270 | return log_error_errno(r, "Failed to enable SO_PASSCRED: %m"); | |
1271 | ||
1272 | manager->inotify_fd = inotify_init1(IN_CLOEXEC); | |
1273 | if (manager->inotify_fd < 0) | |
1274 | return log_error_errno(errno, "Failed to create inotify descriptor: %m"); | |
1275 | ||
1276 | udev_watch_restore(manager->inotify_fd); | |
1277 | ||
1278 | /* block and listen to all signals on signalfd */ | |
1279 | assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, SIGHUP, SIGCHLD, SIGRTMIN+18, -1) >= 0); | |
1280 | ||
1281 | r = sd_event_default(&manager->event); | |
1282 | if (r < 0) | |
1283 | return log_error_errno(r, "Failed to allocate event loop: %m"); | |
1284 | ||
1285 | r = sd_event_add_signal(manager->event, NULL, SIGINT, on_sigterm, manager); | |
1286 | if (r < 0) | |
1287 | return log_error_errno(r, "Failed to create SIGINT event source: %m"); | |
1288 | ||
1289 | r = sd_event_add_signal(manager->event, NULL, SIGTERM, on_sigterm, manager); | |
1290 | if (r < 0) | |
1291 | return log_error_errno(r, "Failed to create SIGTERM event source: %m"); | |
1292 | ||
1293 | r = sd_event_add_signal(manager->event, NULL, SIGHUP, on_sighup, manager); | |
1294 | if (r < 0) | |
1295 | return log_error_errno(r, "Failed to create SIGHUP event source: %m"); | |
1296 | ||
1297 | r = sd_event_set_watchdog(manager->event, true); | |
1298 | if (r < 0) | |
1299 | return log_error_errno(r, "Failed to create watchdog event source: %m"); | |
1300 | ||
1301 | r = udev_ctrl_attach_event(manager->ctrl, manager->event); | |
1302 | if (r < 0) | |
1303 | return log_error_errno(r, "Failed to attach event to udev control: %m"); | |
1304 | ||
1305 | r = udev_ctrl_start(manager->ctrl, on_ctrl_msg, manager); | |
1306 | if (r < 0) | |
1307 | return log_error_errno(r, "Failed to start device monitor: %m"); | |
1308 | ||
1309 | /* This needs to be after the inotify and uevent handling, to make sure | |
1310 | * that the ping is send back after fully processing the pending uevents | |
1311 | * (including the synthetic ones we may create due to inotify events). | |
1312 | */ | |
1313 | r = sd_event_source_set_priority(udev_ctrl_get_event_source(manager->ctrl), SD_EVENT_PRIORITY_IDLE); | |
1314 | if (r < 0) | |
1315 | return log_error_errno(r, "Failed to set IDLE event priority for udev control event source: %m"); | |
1316 | ||
1317 | r = sd_event_add_io(manager->event, &manager->inotify_event, manager->inotify_fd, EPOLLIN, on_inotify, manager); | |
1318 | if (r < 0) | |
1319 | return log_error_errno(r, "Failed to create inotify event source: %m"); | |
1320 | ||
1321 | r = sd_device_monitor_attach_event(manager->monitor, manager->event); | |
1322 | if (r < 0) | |
1323 | return log_error_errno(r, "Failed to attach event to device monitor: %m"); | |
1324 | ||
1325 | r = sd_device_monitor_start(manager->monitor, on_uevent, manager); | |
1326 | if (r < 0) | |
1327 | return log_error_errno(r, "Failed to start device monitor: %m"); | |
1328 | ||
1329 | r = sd_event_add_io(manager->event, NULL, fd_worker, EPOLLIN, on_worker, manager); | |
1330 | if (r < 0) | |
1331 | return log_error_errno(r, "Failed to create worker event source: %m"); | |
1332 | ||
1333 | r = sd_event_add_post(manager->event, NULL, on_post, manager); | |
1334 | if (r < 0) | |
1335 | return log_error_errno(r, "Failed to create post event source: %m"); | |
1336 | ||
1337 | /* Eventually, we probably want to do more here on memory pressure, for example, kill idle workers immediately */ | |
1338 | r = sd_event_add_memory_pressure(manager->event, &manager->memory_pressure_event_source, NULL, NULL); | |
1339 | if (r < 0) | |
1340 | log_full_errno(ERRNO_IS_NOT_SUPPORTED(r) || ERRNO_IS_PRIVILEGE(r) || (r == -EHOSTDOWN) ? LOG_DEBUG : LOG_WARNING, r, | |
1341 | "Failed to allocate memory pressure watch, ignoring: %m"); | |
1342 | ||
1343 | r = sd_event_add_signal(manager->event, &manager->memory_pressure_event_source, SIGRTMIN+18, sigrtmin18_handler, NULL); | |
1344 | if (r < 0) | |
1345 | return log_error_errno(r, "Failed to allocate SIGRTMIN+18 event source, ignoring: %m"); | |
1346 | ||
1347 | manager->last_usec = now(CLOCK_MONOTONIC); | |
1348 | ||
1349 | udev_builtin_init(); | |
1350 | ||
1351 | r = udev_rules_load(&manager->rules, manager->resolve_name_timing); | |
1352 | if (r < 0) | |
1353 | return log_error_errno(r, "Failed to read udev rules: %m"); | |
1354 | ||
1355 | r = udev_rules_apply_static_dev_perms(manager->rules); | |
1356 | if (r < 0) | |
1357 | log_warning_errno(r, "Failed to apply permissions on static device nodes, ignoring: %m"); | |
1358 | ||
1359 | notify_ready(manager); | |
1360 | ||
1361 | r = sd_event_loop(manager->event); | |
1362 | if (r < 0) | |
1363 | log_error_errno(r, "Event loop failed: %m"); | |
1364 | ||
1365 | (void) sd_notify(/* unset= */ false, NOTIFY_STOPPING); | |
1366 | return r; | |
1367 | } |