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Commit | Line | Data |
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f13467ec | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
7fafc032 | 2 | /* |
810adae9 LP |
3 | * Copyright © 2004 Chris Friesen <chris_friesen@sympatico.ca> |
4 | * Copyright © 2009 Canonical Ltd. | |
5 | * Copyright © 2009 Scott James Remnant <scott@netsplit.com> | |
7fafc032 KS |
6 | */ |
7 | ||
7fafc032 | 8 | #include <errno.h> |
618234a5 LP |
9 | #include <fcntl.h> |
10 | #include <getopt.h> | |
618234a5 LP |
11 | #include <stdbool.h> |
12 | #include <stddef.h> | |
7fafc032 KS |
13 | #include <stdio.h> |
14 | #include <stdlib.h> | |
618234a5 | 15 | #include <sys/epoll.h> |
3ebdb81e | 16 | #include <sys/file.h> |
618234a5 LP |
17 | #include <sys/inotify.h> |
18 | #include <sys/ioctl.h> | |
19 | #include <sys/mount.h> | |
1e03b754 | 20 | #include <sys/prctl.h> |
1e03b754 | 21 | #include <sys/signalfd.h> |
dc117daa | 22 | #include <sys/stat.h> |
618234a5 LP |
23 | #include <sys/time.h> |
24 | #include <sys/wait.h> | |
25 | #include <unistd.h> | |
7fafc032 | 26 | |
392ef7a2 | 27 | #include "sd-daemon.h" |
693d371d | 28 | #include "sd-event.h" |
8314de1d | 29 | |
b5efdb8a | 30 | #include "alloc-util.h" |
9409174e | 31 | #include "blockdev-util.h" |
a1f4fd38 | 32 | #include "cgroup-setup.h" |
194bbe33 | 33 | #include "cgroup-util.h" |
79d905af | 34 | #include "common-signal.h" |
618234a5 | 35 | #include "cpu-set-util.h" |
f8433153 | 36 | #include "daemon-util.h" |
5ba2dc25 | 37 | #include "dev-setup.h" |
7f2e3a14 | 38 | #include "device-monitor-private.h" |
abde5ea8 | 39 | #include "device-private.h" |
70068602 | 40 | #include "device-util.h" |
6467bda5 | 41 | #include "errno-list.h" |
6d63048a | 42 | #include "event-util.h" |
3ffd4af2 | 43 | #include "fd-util.h" |
a5c32cff | 44 | #include "fileio.h" |
f97b34a6 | 45 | #include "format-util.h" |
f4f15635 | 46 | #include "fs-util.h" |
a505965d | 47 | #include "hashmap.h" |
9e5fd717 | 48 | #include "inotify-util.h" |
c004493c | 49 | #include "io-util.h" |
eefc66aa | 50 | #include "limits-util.h" |
40a57716 | 51 | #include "list.h" |
0c5a109a | 52 | #include "main-func.h" |
5ea78a39 | 53 | #include "mkdir.h" |
618234a5 | 54 | #include "netlink-util.h" |
6bedfcbb | 55 | #include "parse-util.h" |
a1f4fd38 | 56 | #include "path-util.h" |
294bf0c3 | 57 | #include "pretty-print.h" |
4e731273 | 58 | #include "proc-cmdline.h" |
618234a5 LP |
59 | #include "process-util.h" |
60 | #include "selinux-util.h" | |
61 | #include "signal-util.h" | |
8f328d36 | 62 | #include "socket-util.h" |
07630cea | 63 | #include "string-util.h" |
49fe5c09 | 64 | #include "strv.h" |
5ea78a39 | 65 | #include "strxcpyx.h" |
46f0fbd8 | 66 | #include "syslog-util.h" |
63e2d171 | 67 | #include "udevd.h" |
07a26e42 | 68 | #include "udev-builtin.h" |
7d68eb1b | 69 | #include "udev-ctrl.h" |
25de7aa7 | 70 | #include "udev-event.h" |
10551728 | 71 | #include "udev-node.h" |
618234a5 | 72 | #include "udev-util.h" |
70068602 | 73 | #include "udev-watch.h" |
ee104e11 | 74 | #include "user-util.h" |
47350c5f | 75 | #include "version.h" |
7fafc032 | 76 | |
88bd5a32 | 77 | #define WORKER_NUM_MAX 2048U |
5d354e52 YW |
78 | #define EVENT_RETRY_INTERVAL_USEC (200 * USEC_PER_MSEC) |
79 | #define EVENT_RETRY_TIMEOUT_USEC (3 * USEC_PER_MINUTE) | |
88bd5a32 | 80 | |
bba7a484 TG |
81 | static bool arg_debug = false; |
82 | static int arg_daemonize = false; | |
c4d44cba | 83 | static ResolveNameTiming arg_resolve_name_timing = RESOLVE_NAME_EARLY; |
216e8bbe | 84 | static unsigned arg_children_max = 0; |
6b92f429 | 85 | static usec_t arg_exec_delay_usec = 0; |
bba7a484 | 86 | static usec_t arg_event_timeout_usec = 180 * USEC_PER_SEC; |
e2099267 | 87 | static int arg_timeout_signal = SIGKILL; |
95ac5230 | 88 | static bool arg_blockdev_read_only = false; |
c0c6806b | 89 | |
d9239923 YW |
90 | typedef struct Event Event; |
91 | typedef struct Worker Worker; | |
92 | ||
c0c6806b | 93 | typedef struct Manager { |
693d371d | 94 | sd_event *event; |
c0c6806b | 95 | Hashmap *workers; |
d9239923 | 96 | LIST_HEAD(Event, events); |
a1f4fd38 | 97 | char *cgroup; |
cb49a4f2 | 98 | pid_t pid; /* the process that originally allocated the manager object */ |
1a0bd015 | 99 | int log_level; |
c0c6806b | 100 | |
9a07157d | 101 | UdevRules *rules; |
9b5150b6 | 102 | Hashmap *properties; |
c0c6806b | 103 | |
0bed242c YW |
104 | sd_netlink *rtnl; |
105 | ||
7f2e3a14 | 106 | sd_device_monitor *monitor; |
e0d61dac | 107 | UdevCtrl *ctrl; |
e237d8cb TG |
108 | int worker_watch[2]; |
109 | ||
df7ee959 YW |
110 | /* used by udev-watch */ |
111 | int inotify_fd; | |
693d371d | 112 | sd_event_source *inotify_event; |
df7ee959 | 113 | |
eca195ec | 114 | sd_event_source *kill_workers_event; |
693d371d | 115 | |
79d905af LP |
116 | sd_event_source *memory_pressure_event_source; |
117 | sd_event_source *sigrtmin18_event_source; | |
118 | ||
7c4c7e89 TG |
119 | usec_t last_usec; |
120 | ||
10551728 | 121 | bool udev_node_needs_cleanup; |
481f24d1 YW |
122 | bool stop_exec_queue; |
123 | bool exit; | |
c0c6806b | 124 | } Manager; |
1e03b754 | 125 | |
d9239923 | 126 | typedef enum EventState { |
912541b0 KS |
127 | EVENT_UNDEF, |
128 | EVENT_QUEUED, | |
129 | EVENT_RUNNING, | |
d9239923 | 130 | } EventState; |
1e03b754 | 131 | |
d9239923 | 132 | typedef struct Event { |
cb49a4f2 | 133 | Manager *manager; |
d9239923 YW |
134 | Worker *worker; |
135 | EventState state; | |
eb546b35 YW |
136 | |
137 | sd_device *dev; | |
eb546b35 | 138 | |
0c3d8182 | 139 | sd_device_action_t action; |
eb546b35 | 140 | uint64_t seqnum; |
a1fa99d8 | 141 | uint64_t blocker_seqnum; |
29d02458 YW |
142 | const char *id; |
143 | const char *devpath; | |
144 | const char *devpath_old; | |
34458dbb | 145 | const char *devnode; |
4f294ffd YW |
146 | |
147 | /* Used when the device is locked by another program. */ | |
5d354e52 YW |
148 | usec_t retry_again_next_usec; |
149 | usec_t retry_again_timeout_usec; | |
4f294ffd | 150 | sd_event_source *retry_event_source; |
d8f462b4 YW |
151 | |
152 | sd_event_source *timeout_warning_event; | |
153 | sd_event_source *timeout_event; | |
eb546b35 | 154 | |
d9239923 YW |
155 | LIST_FIELDS(Event, event); |
156 | } Event; | |
1e03b754 | 157 | |
d9239923 | 158 | typedef enum WorkerState { |
912541b0 KS |
159 | WORKER_UNDEF, |
160 | WORKER_RUNNING, | |
161 | WORKER_IDLE, | |
162 | WORKER_KILLED, | |
f257a8fc | 163 | WORKER_KILLING, |
d9239923 | 164 | } WorkerState; |
1e03b754 | 165 | |
d9239923 | 166 | typedef struct Worker { |
c0c6806b | 167 | Manager *manager; |
912541b0 | 168 | pid_t pid; |
82e0b631 | 169 | sd_event_source *child_event_source; |
7f2e3a14 | 170 | sd_device_monitor *monitor; |
d9239923 YW |
171 | WorkerState state; |
172 | Event *event; | |
173 | } Worker; | |
1e03b754 KS |
174 | |
175 | /* passed from worker to main process */ | |
5d354e52 | 176 | typedef enum EventResult { |
6467bda5 YW |
177 | EVENT_RESULT_NERRNO_MIN = -ERRNO_MAX, |
178 | EVENT_RESULT_NERRNO_MAX = -1, | |
a79cba33 | 179 | EVENT_RESULT_SUCCESS = 0, |
6467bda5 YW |
180 | EVENT_RESULT_EXIT_STATUS_BASE = 0, |
181 | EVENT_RESULT_EXIT_STATUS_MAX = 255, | |
182 | EVENT_RESULT_TRY_AGAIN = 256, /* when the block device is locked by another process. */ | |
183 | EVENT_RESULT_SIGNAL_BASE = 257, | |
184 | EVENT_RESULT_SIGNAL_MAX = EVENT_RESULT_SIGNAL_BASE + _NSIG, | |
5d354e52 | 185 | _EVENT_RESULT_MAX, |
6467bda5 | 186 | _EVENT_RESULT_INVALID = -EINVAL, |
5d354e52 | 187 | } EventResult; |
1e03b754 | 188 | |
5393c528 | 189 | static Event *event_free(Event *event) { |
c6aa11f2 | 190 | if (!event) |
5393c528 | 191 | return NULL; |
ba47b71c | 192 | |
40a57716 | 193 | assert(event->manager); |
c6aa11f2 | 194 | |
40a57716 | 195 | LIST_REMOVE(event, event->manager->events, event); |
eb546b35 | 196 | sd_device_unref(event->dev); |
c6aa11f2 | 197 | |
72151060 YW |
198 | /* Do not use sd_event_source_disable_unref() here, as this is called by both workers and the |
199 | * main process. */ | |
4f294ffd | 200 | sd_event_source_unref(event->retry_event_source); |
72151060 YW |
201 | sd_event_source_unref(event->timeout_warning_event); |
202 | sd_event_source_unref(event->timeout_event); | |
693d371d | 203 | |
c6aa11f2 TG |
204 | if (event->worker) |
205 | event->worker->event = NULL; | |
206 | ||
5393c528 | 207 | return mfree(event); |
aa8734ff | 208 | } |
7a770250 | 209 | |
419ec631 | 210 | static void event_queue_cleanup(Manager *manager, EventState match_state) { |
80a226b2 | 211 | LIST_FOREACH(event, event, manager->events) { |
419ec631 YW |
212 | if (match_state != EVENT_UNDEF && match_state != event->state) |
213 | continue; | |
214 | ||
215 | event_free(event); | |
216 | } | |
217 | } | |
218 | ||
d9239923 | 219 | static Worker *worker_free(Worker *worker) { |
c6aa11f2 | 220 | if (!worker) |
75db809a | 221 | return NULL; |
bc113de9 | 222 | |
82e0b631 YW |
223 | if (worker->manager) |
224 | hashmap_remove(worker->manager->workers, PID_TO_PTR(worker->pid)); | |
c0c6806b | 225 | |
82e0b631 | 226 | sd_event_source_unref(worker->child_event_source); |
7f2e3a14 | 227 | sd_device_monitor_unref(worker->monitor); |
c6aa11f2 TG |
228 | event_free(worker->event); |
229 | ||
75db809a | 230 | return mfree(worker); |
ff2c503d KS |
231 | } |
232 | ||
d9239923 YW |
233 | DEFINE_TRIVIAL_CLEANUP_FUNC(Worker*, worker_free); |
234 | DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(worker_hash_op, void, trivial_hash_func, trivial_compare_func, Worker, worker_free); | |
fc465079 | 235 | |
419ec631 YW |
236 | static void manager_clear_for_worker(Manager *manager) { |
237 | assert(manager); | |
238 | ||
f777e745 YW |
239 | /* Do not use sd_event_source_disable_unref() here, as this is called by both workers and the |
240 | * main process. */ | |
241 | manager->inotify_event = sd_event_source_unref(manager->inotify_event); | |
242 | manager->kill_workers_event = sd_event_source_unref(manager->kill_workers_event); | |
419ec631 YW |
243 | |
244 | manager->event = sd_event_unref(manager->event); | |
245 | ||
246 | manager->workers = hashmap_free(manager->workers); | |
247 | event_queue_cleanup(manager, EVENT_UNDEF); | |
248 | ||
249 | manager->monitor = sd_device_monitor_unref(manager->monitor); | |
250 | manager->ctrl = udev_ctrl_unref(manager->ctrl); | |
251 | ||
252 | manager->worker_watch[READ_END] = safe_close(manager->worker_watch[READ_END]); | |
253 | } | |
254 | ||
255 | static Manager* manager_free(Manager *manager) { | |
256 | if (!manager) | |
257 | return NULL; | |
258 | ||
259 | udev_builtin_exit(); | |
260 | ||
419ec631 YW |
261 | manager_clear_for_worker(manager); |
262 | ||
263 | sd_netlink_unref(manager->rtnl); | |
264 | ||
265 | hashmap_free_free_free(manager->properties); | |
266 | udev_rules_free(manager->rules); | |
267 | ||
268 | safe_close(manager->inotify_fd); | |
269 | safe_close_pair(manager->worker_watch); | |
270 | ||
79d905af LP |
271 | sd_event_source_unref(manager->memory_pressure_event_source); |
272 | sd_event_source_unref(manager->sigrtmin18_event_source); | |
273 | ||
a1f4fd38 | 274 | free(manager->cgroup); |
419ec631 YW |
275 | return mfree(manager); |
276 | } | |
277 | ||
278 | DEFINE_TRIVIAL_CLEANUP_FUNC(Manager*, manager_free); | |
279 | ||
82e0b631 YW |
280 | static int on_sigchld(sd_event_source *s, const siginfo_t *si, void *userdata); |
281 | ||
d9239923 YW |
282 | static int worker_new(Worker **ret, Manager *manager, sd_device_monitor *worker_monitor, pid_t pid) { |
283 | _cleanup_(worker_freep) Worker *worker = NULL; | |
a505965d | 284 | int r; |
3a19b32a TG |
285 | |
286 | assert(ret); | |
c0c6806b | 287 | assert(manager); |
3a19b32a TG |
288 | assert(worker_monitor); |
289 | assert(pid > 1); | |
290 | ||
d4053464 YW |
291 | /* close monitor, but keep address around */ |
292 | device_monitor_disconnect(worker_monitor); | |
293 | ||
d9239923 | 294 | worker = new(Worker, 1); |
3a19b32a TG |
295 | if (!worker) |
296 | return -ENOMEM; | |
297 | ||
d9239923 | 298 | *worker = (Worker) { |
d4053464 YW |
299 | .monitor = sd_device_monitor_ref(worker_monitor), |
300 | .pid = pid, | |
301 | }; | |
a505965d | 302 | |
82e0b631 YW |
303 | r = sd_event_add_child(manager->event, &worker->child_event_source, pid, WEXITED, on_sigchld, worker); |
304 | if (r < 0) | |
305 | return r; | |
306 | ||
92a74c47 | 307 | r = hashmap_ensure_put(&manager->workers, &worker_hash_op, PID_TO_PTR(pid), worker); |
a505965d TG |
308 | if (r < 0) |
309 | return r; | |
310 | ||
82e0b631 | 311 | worker->manager = manager; |
3a19b32a | 312 | |
82e0b631 | 313 | *ret = TAKE_PTR(worker); |
3a19b32a TG |
314 | return 0; |
315 | } | |
316 | ||
419ec631 YW |
317 | static void manager_kill_workers(Manager *manager, bool force) { |
318 | Worker *worker; | |
4fa4d885 | 319 | |
419ec631 | 320 | assert(manager); |
4fa4d885 | 321 | |
419ec631 YW |
322 | HASHMAP_FOREACH(worker, manager->workers) { |
323 | if (worker->state == WORKER_KILLED) | |
324 | continue; | |
4fa4d885 | 325 | |
419ec631 YW |
326 | if (worker->state == WORKER_RUNNING && !force) { |
327 | worker->state = WORKER_KILLING; | |
328 | continue; | |
329 | } | |
4fa4d885 | 330 | |
419ec631 YW |
331 | worker->state = WORKER_KILLED; |
332 | (void) kill(worker->pid, SIGTERM); | |
333 | } | |
4fa4d885 TG |
334 | } |
335 | ||
419ec631 YW |
336 | static void manager_exit(Manager *manager) { |
337 | assert(manager); | |
693d371d | 338 | |
419ec631 | 339 | manager->exit = true; |
693d371d | 340 | |
f8433153 | 341 | (void) sd_notify(/* unset= */ false, NOTIFY_STOPPING); |
39c19cf1 | 342 | |
419ec631 YW |
343 | /* close sources of new events and discard buffered events */ |
344 | manager->ctrl = udev_ctrl_unref(manager->ctrl); | |
0bed242c | 345 | |
9612da36 | 346 | manager->inotify_event = sd_event_source_disable_unref(manager->inotify_event); |
419ec631 | 347 | manager->inotify_fd = safe_close(manager->inotify_fd); |
0bed242c | 348 | |
7f2e3a14 | 349 | manager->monitor = sd_device_monitor_unref(manager->monitor); |
0bed242c | 350 | |
419ec631 YW |
351 | /* discard queued events and kill workers */ |
352 | event_queue_cleanup(manager, EVENT_QUEUED); | |
353 | manager_kill_workers(manager, true); | |
0bed242c YW |
354 | } |
355 | ||
4bf4f50f ZJS |
356 | static void notify_ready(void) { |
357 | int r; | |
358 | ||
f8433153 | 359 | r = sd_notifyf(/* unset= */ false, |
4bf4f50f ZJS |
360 | "READY=1\n" |
361 | "STATUS=Processing with %u children at max", arg_children_max); | |
362 | if (r < 0) | |
363 | log_warning_errno(r, "Failed to send readiness notification, ignoring: %m"); | |
364 | } | |
365 | ||
419ec631 | 366 | /* reload requested, HUP signal received, rules changed, builtin changed */ |
e9d1fae3 YW |
367 | static void manager_reload(Manager *manager, bool force) { |
368 | _cleanup_(udev_rules_freep) UdevRules *rules = NULL; | |
369 | usec_t now_usec; | |
370 | int r; | |
371 | ||
419ec631 | 372 | assert(manager); |
b2d21d93 | 373 | |
e9d1fae3 YW |
374 | assert_se(sd_event_now(manager->event, CLOCK_MONOTONIC, &now_usec) >= 0); |
375 | if (!force && now_usec < usec_add(manager->last_usec, 3 * USEC_PER_SEC)) | |
376 | /* check for changed config, every 3 seconds at most */ | |
377 | return; | |
378 | manager->last_usec = now_usec; | |
379 | ||
380 | /* Reload SELinux label database, to make the child inherit the up-to-date database. */ | |
381 | mac_selinux_maybe_reload(); | |
382 | ||
383 | /* Nothing changed. It is not necessary to reload. */ | |
f8433153 | 384 | if (!udev_rules_should_reload(manager->rules) && !udev_builtin_should_reload()) { |
e9d1fae3 | 385 | |
f8433153 LP |
386 | if (!force) |
387 | return; | |
76e62a4d | 388 | |
f8433153 LP |
389 | /* If we eat this up, then tell our service manager to just continue */ |
390 | (void) sd_notifyf(/* unset= */ false, | |
391 | "RELOADING=1\n" | |
392 | "STATUS=Skipping configuration reloading, nothing changed.\n" | |
393 | "MONOTONIC_USEC=" USEC_FMT, now(CLOCK_MONOTONIC)); | |
394 | } else { | |
395 | (void) sd_notifyf(/* unset= */ false, | |
396 | "RELOADING=1\n" | |
397 | "STATUS=Flushing configuration...\n" | |
398 | "MONOTONIC_USEC=" USEC_FMT, now(CLOCK_MONOTONIC)); | |
e9d1fae3 | 399 | |
f8433153 | 400 | manager_kill_workers(manager, false); |
e9d1fae3 | 401 | |
f8433153 LP |
402 | udev_builtin_exit(); |
403 | udev_builtin_init(); | |
404 | ||
405 | r = udev_rules_load(&rules, arg_resolve_name_timing); | |
406 | if (r < 0) | |
407 | log_warning_errno(r, "Failed to read udev rules, using the previously loaded rules, ignoring: %m"); | |
408 | else | |
409 | udev_rules_free_and_replace(manager->rules, rules); | |
410 | } | |
693d371d | 411 | |
4bf4f50f | 412 | notify_ready(); |
419ec631 | 413 | } |
e237d8cb | 414 | |
419ec631 | 415 | static int on_kill_workers_event(sd_event_source *s, uint64_t usec, void *userdata) { |
99534007 | 416 | Manager *manager = ASSERT_PTR(userdata); |
e237d8cb | 417 | |
419ec631 YW |
418 | log_debug("Cleanup idle workers"); |
419 | manager_kill_workers(manager, false); | |
e237d8cb | 420 | |
419ec631 YW |
421 | return 1; |
422 | } | |
e237d8cb | 423 | |
a79cba33 | 424 | static void device_broadcast(sd_device_monitor *monitor, sd_device *dev, EventResult result) { |
c17ab900 YW |
425 | int r; |
426 | ||
427 | assert(dev); | |
428 | ||
429 | /* On exit, manager->monitor is already NULL. */ | |
430 | if (!monitor) | |
431 | return; | |
432 | ||
a79cba33 | 433 | if (result != EVENT_RESULT_SUCCESS) { |
6467bda5 YW |
434 | (void) device_add_property(dev, "UDEV_WORKER_FAILED", "1"); |
435 | ||
436 | switch (result) { | |
fb544617 YW |
437 | case EVENT_RESULT_NERRNO_MIN ... EVENT_RESULT_NERRNO_MAX: { |
438 | const char *str; | |
439 | ||
6467bda5 | 440 | (void) device_add_propertyf(dev, "UDEV_WORKER_ERRNO", "%i", -result); |
6467bda5 | 441 | |
fb544617 YW |
442 | str = errno_to_name(result); |
443 | if (str) | |
444 | (void) device_add_property(dev, "UDEV_WORKER_ERRNO_NAME", str); | |
445 | break; | |
446 | } | |
6467bda5 YW |
447 | case EVENT_RESULT_EXIT_STATUS_BASE ... EVENT_RESULT_EXIT_STATUS_MAX: |
448 | (void) device_add_propertyf(dev, "UDEV_WORKER_EXIT_STATUS", "%i", result - EVENT_RESULT_EXIT_STATUS_BASE); | |
449 | break; | |
450 | ||
451 | case EVENT_RESULT_TRY_AGAIN: | |
452 | assert_not_reached(); | |
453 | break; | |
454 | ||
fb544617 YW |
455 | case EVENT_RESULT_SIGNAL_BASE ... EVENT_RESULT_SIGNAL_MAX: { |
456 | const char *str; | |
457 | ||
6467bda5 | 458 | (void) device_add_propertyf(dev, "UDEV_WORKER_SIGNAL", "%i", result - EVENT_RESULT_SIGNAL_BASE); |
6467bda5 | 459 | |
fb544617 YW |
460 | str = signal_to_string(result - EVENT_RESULT_SIGNAL_BASE); |
461 | if (str) | |
462 | (void) device_add_property(dev, "UDEV_WORKER_SIGNAL_NAME", str); | |
463 | break; | |
464 | } | |
6467bda5 YW |
465 | default: |
466 | log_device_warning(dev, "Unknown event result \"%i\", ignoring.", result); | |
467 | } | |
468 | } | |
469 | ||
c17ab900 YW |
470 | r = device_monitor_send_device(monitor, NULL, dev); |
471 | if (r < 0) | |
472 | log_device_warning_errno(dev, r, | |
473 | "Failed to broadcast event to libudev listeners, ignoring: %m"); | |
474 | } | |
475 | ||
a79cba33 | 476 | static int worker_send_result(Manager *manager, EventResult result) { |
5d354e52 YW |
477 | assert(manager); |
478 | assert(manager->worker_watch[WRITE_END] >= 0); | |
9a73bd7c | 479 | |
5d354e52 | 480 | return loop_write(manager->worker_watch[WRITE_END], &result, sizeof(result), false); |
9a73bd7c TG |
481 | } |
482 | ||
78e278ad | 483 | static int device_get_whole_disk(sd_device *dev, sd_device **ret_device, const char **ret_devname) { |
b97897e3 YW |
484 | const char *val; |
485 | int r; | |
fee854ee | 486 | |
0bed242c | 487 | assert(dev); |
a1130022 LP |
488 | |
489 | if (device_for_action(dev, SD_DEVICE_REMOVE)) | |
7b7959fb | 490 | goto irrelevant; |
0bed242c | 491 | |
b97897e3 YW |
492 | r = sd_device_get_sysname(dev, &val); |
493 | if (r < 0) | |
494 | return log_device_debug_errno(dev, r, "Failed to get sysname: %m"); | |
495 | ||
a9e83209 YW |
496 | /* Exclude the following devices: |
497 | * For "dm-", see the comment added by e918a1b5a94f270186dca59156354acd2a596494. | |
498 | * For "md", see the commit message of 2e5b17d01347d3c3118be2b8ad63d20415dbb1f0, | |
499 | * but not sure the assumption is still valid even when partitions are created on the md | |
500 | * devices, surprisingly which seems to be possible, see PR #22973. | |
501 | * For "drbd", see the commit message of fee854ee8ccde0cd28e0f925dea18cce35f3993d. */ | |
49fe5c09 | 502 | if (STARTSWITH_SET(val, "dm-", "md", "drbd")) |
7b7959fb | 503 | goto irrelevant; |
0bed242c | 504 | |
8f71534e YW |
505 | r = block_device_get_whole_disk(dev, &dev); |
506 | if (IN_SET(r, | |
507 | -ENOTBLK, /* The device is not a block device. */ | |
508 | -ENODEV /* The whole disk device was not found, it may already be removed. */)) | |
509 | goto irrelevant; | |
510 | if (r < 0) | |
511 | return log_device_debug_errno(dev, r, "Failed to get whole disk device: %m"); | |
0bed242c | 512 | |
b97897e3 | 513 | r = sd_device_get_devname(dev, &val); |
b97897e3 YW |
514 | if (r < 0) |
515 | return log_device_debug_errno(dev, r, "Failed to get devname: %m"); | |
0bed242c | 516 | |
78e278ad YW |
517 | if (ret_device) |
518 | *ret_device = dev; | |
519 | if (ret_devname) | |
520 | *ret_devname = val; | |
7b7959fb YW |
521 | return 1; |
522 | ||
523 | irrelevant: | |
78e278ad YW |
524 | if (ret_device) |
525 | *ret_device = NULL; | |
526 | if (ret_devname) | |
527 | *ret_devname = NULL; | |
7b7959fb YW |
528 | return 0; |
529 | } | |
530 | ||
03a24ce7 | 531 | static int worker_lock_whole_disk(sd_device *dev, int *ret_fd) { |
254d1313 | 532 | _cleanup_close_ int fd = -EBADF; |
78e278ad | 533 | sd_device *dev_whole_disk; |
7b7959fb YW |
534 | const char *val; |
535 | int r; | |
536 | ||
537 | assert(dev); | |
538 | assert(ret_fd); | |
539 | ||
540 | /* Take a shared lock on the device node; this establishes a concept of device "ownership" to | |
541 | * serialize device access. External processes holding an exclusive lock will cause udev to skip the | |
542 | * event handling; in the case udev acquired the lock, the external process can block until udev has | |
543 | * finished its event handling. */ | |
544 | ||
78e278ad | 545 | r = device_get_whole_disk(dev, &dev_whole_disk, &val); |
7b7959fb YW |
546 | if (r < 0) |
547 | return r; | |
548 | if (r == 0) | |
549 | goto nolock; | |
550 | ||
32703bd1 | 551 | fd = sd_device_open(dev_whole_disk, O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_NOCTTY); |
b97897e3 | 552 | if (fd < 0) { |
78e278ad | 553 | bool ignore = ERRNO_IS_DEVICE_ABSENT(fd); |
ef400c38 | 554 | |
78e278ad | 555 | log_device_debug_errno(dev, fd, "Failed to open '%s'%s: %m", val, ignore ? ", ignoring" : ""); |
7b7959fb | 556 | if (!ignore) |
78e278ad | 557 | return fd; |
7b7959fb YW |
558 | |
559 | goto nolock; | |
b97897e3 | 560 | } |
0bed242c YW |
561 | |
562 | if (flock(fd, LOCK_SH|LOCK_NB) < 0) | |
b97897e3 | 563 | return log_device_debug_errno(dev, errno, "Failed to flock(%s): %m", val); |
0bed242c YW |
564 | |
565 | *ret_fd = TAKE_FD(fd); | |
566 | return 1; | |
7b7959fb YW |
567 | |
568 | nolock: | |
254d1313 | 569 | *ret_fd = -EBADF; |
7b7959fb | 570 | return 0; |
fee854ee RK |
571 | } |
572 | ||
95ac5230 | 573 | static int worker_mark_block_device_read_only(sd_device *dev) { |
254d1313 | 574 | _cleanup_close_ int fd = -EBADF; |
95ac5230 LP |
575 | const char *val; |
576 | int state = 1, r; | |
577 | ||
578 | assert(dev); | |
579 | ||
580 | if (!arg_blockdev_read_only) | |
581 | return 0; | |
582 | ||
583 | /* Do this only once, when the block device is new. If the device is later retriggered let's not | |
584 | * toggle the bit again, so that people can boot up with full read-only mode and then unset the bit | |
585 | * for specific devices only. */ | |
a1130022 | 586 | if (!device_for_action(dev, SD_DEVICE_ADD)) |
95ac5230 LP |
587 | return 0; |
588 | ||
589 | r = sd_device_get_subsystem(dev, &val); | |
590 | if (r < 0) | |
591 | return log_device_debug_errno(dev, r, "Failed to get subsystem: %m"); | |
592 | ||
593 | if (!streq(val, "block")) | |
594 | return 0; | |
595 | ||
596 | r = sd_device_get_sysname(dev, &val); | |
597 | if (r < 0) | |
598 | return log_device_debug_errno(dev, r, "Failed to get sysname: %m"); | |
599 | ||
600 | /* Exclude synthetic devices for now, this is supposed to be a safety feature to avoid modification | |
601 | * of physical devices, and what sits on top of those doesn't really matter if we don't allow the | |
cb713f16 | 602 | * underlying block devices to receive changes. */ |
95ac5230 LP |
603 | if (STARTSWITH_SET(val, "dm-", "md", "drbd", "loop", "nbd", "zram")) |
604 | return 0; | |
605 | ||
32703bd1 | 606 | fd = sd_device_open(dev, O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_NOCTTY); |
95ac5230 | 607 | if (fd < 0) |
78e278ad | 608 | return log_device_debug_errno(dev, fd, "Failed to open '%s', ignoring: %m", val); |
95ac5230 LP |
609 | |
610 | if (ioctl(fd, BLKROSET, &state) < 0) | |
611 | return log_device_warning_errno(dev, errno, "Failed to mark block device '%s' read-only: %m", val); | |
612 | ||
613 | log_device_info(dev, "Successfully marked block device '%s' read-only.", val); | |
614 | return 0; | |
615 | } | |
616 | ||
abde5ea8 | 617 | static int worker_process_device(Manager *manager, sd_device *dev) { |
2e088715 | 618 | _cleanup_(udev_event_freep) UdevEvent *udev_event = NULL; |
254d1313 | 619 | _cleanup_close_ int fd_lock = -EBADF; |
0bed242c | 620 | int r; |
912541b0 | 621 | |
0bed242c YW |
622 | assert(manager); |
623 | assert(dev); | |
624 | ||
b2d9e58f | 625 | log_device_uevent(dev, "Processing device"); |
abde5ea8 | 626 | |
1a0bd015 | 627 | udev_event = udev_event_new(dev, arg_exec_delay_usec, manager->rtnl, manager->log_level); |
0bed242c YW |
628 | if (!udev_event) |
629 | return -ENOMEM; | |
630 | ||
5d354e52 YW |
631 | /* If this is a block device and the device is locked currently via the BSD advisory locks, |
632 | * someone else is using it exclusively. We don't run our udev rules now to not interfere. | |
633 | * Instead of processing the event, we requeue the event and will try again after a delay. | |
634 | * | |
635 | * The user-facing side of this: https://systemd.io/BLOCK_DEVICE_LOCKING */ | |
03a24ce7 | 636 | r = worker_lock_whole_disk(dev, &fd_lock); |
6467bda5 YW |
637 | if (r == -EAGAIN) |
638 | return EVENT_RESULT_TRY_AGAIN; | |
b6aab8ef | 639 | if (r < 0) |
0bed242c | 640 | return r; |
912541b0 | 641 | |
95ac5230 LP |
642 | (void) worker_mark_block_device_read_only(dev); |
643 | ||
0bed242c | 644 | /* apply rules, create node, symlinks */ |
df7ee959 YW |
645 | r = udev_event_execute_rules( |
646 | udev_event, | |
647 | manager->inotify_fd, | |
648 | arg_event_timeout_usec, | |
649 | arg_timeout_signal, | |
650 | manager->properties, | |
651 | manager->rules); | |
99058cd6 YW |
652 | if (r < 0) |
653 | return r; | |
654 | ||
e2099267 | 655 | udev_event_execute_run(udev_event, arg_event_timeout_usec, arg_timeout_signal); |
2dd9f98d | 656 | |
0bed242c YW |
657 | if (!manager->rtnl) |
658 | /* in case rtnl was initialized */ | |
659 | manager->rtnl = sd_netlink_ref(udev_event->rtnl); | |
912541b0 | 660 | |
04b25410 YW |
661 | if (udev_event->inotify_watch) { |
662 | r = udev_watch_begin(manager->inotify_fd, dev); | |
663 | if (r < 0 && r != -ENOENT) /* The device may be already removed, ignore -ENOENT. */ | |
664 | log_device_warning_errno(dev, r, "Failed to add inotify watch, ignoring: %m"); | |
665 | } | |
912541b0 | 666 | |
b2d9e58f | 667 | log_device_uevent(dev, "Device processed"); |
0bed242c YW |
668 | return 0; |
669 | } | |
912541b0 | 670 | |
e2130348 | 671 | static int worker_device_monitor_handler(sd_device_monitor *monitor, sd_device *dev, void *userdata) { |
99534007 | 672 | Manager *manager = ASSERT_PTR(userdata); |
e2130348 YW |
673 | int r; |
674 | ||
675 | assert(dev); | |
e2130348 YW |
676 | |
677 | r = worker_process_device(manager, dev); | |
6467bda5 | 678 | if (r == EVENT_RESULT_TRY_AGAIN) |
5d354e52 | 679 | /* if we couldn't acquire the flock(), then requeue the event */ |
6467bda5 YW |
680 | log_device_debug(dev, "Block device is currently locked, requeueing the event."); |
681 | else { | |
682 | if (r < 0) | |
683 | log_device_warning_errno(dev, r, "Failed to process device, ignoring: %m"); | |
e2130348 | 684 | |
5abee64e | 685 | /* send processed event back to libudev listeners */ |
6467bda5 YW |
686 | device_broadcast(monitor, dev, r); |
687 | } | |
e2130348 YW |
688 | |
689 | /* send udevd the result of the event execution */ | |
6467bda5 | 690 | r = worker_send_result(manager, r); |
e2130348 YW |
691 | if (r < 0) |
692 | log_device_warning_errno(dev, r, "Failed to send signal to main daemon, ignoring: %m"); | |
693 | ||
1a0bd015 | 694 | /* Reset the log level, as it might be changed by "OPTIONS=log_level=". */ |
3cc6b14a | 695 | log_set_max_level(manager->log_level); |
1a0bd015 | 696 | |
e2130348 YW |
697 | return 1; |
698 | } | |
699 | ||
7f2e3a14 YW |
700 | static int worker_main(Manager *_manager, sd_device_monitor *monitor, sd_device *first_device) { |
701 | _cleanup_(sd_device_unrefp) sd_device *dev = first_device; | |
0bed242c | 702 | _cleanup_(manager_freep) Manager *manager = _manager; |
44dcf454 | 703 | int r; |
145dae7e | 704 | |
0bed242c YW |
705 | assert(manager); |
706 | assert(monitor); | |
707 | assert(dev); | |
912541b0 | 708 | |
e2130348 YW |
709 | assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, -1) >= 0); |
710 | ||
711 | /* Reset OOM score, we only protect the main daemon. */ | |
712 | r = set_oom_score_adjust(0); | |
713 | if (r < 0) | |
714 | log_debug_errno(r, "Failed to reset OOM score, ignoring: %m"); | |
912541b0 | 715 | |
7802194a | 716 | /* Clear unnecessary data in Manager object. */ |
e2130348 | 717 | manager_clear_for_worker(manager); |
3ebdb81e | 718 | |
e2130348 YW |
719 | r = sd_event_new(&manager->event); |
720 | if (r < 0) | |
721 | return log_error_errno(r, "Failed to allocate event loop: %m"); | |
912541b0 | 722 | |
e2130348 YW |
723 | r = sd_event_add_signal(manager->event, NULL, SIGTERM, NULL, NULL); |
724 | if (r < 0) | |
725 | return log_error_errno(r, "Failed to set SIGTERM event: %m"); | |
4c83d994 | 726 | |
e2130348 YW |
727 | r = sd_device_monitor_attach_event(monitor, manager->event); |
728 | if (r < 0) | |
729 | return log_error_errno(r, "Failed to attach event loop to device monitor: %m"); | |
912541b0 | 730 | |
e2130348 | 731 | r = sd_device_monitor_start(monitor, worker_device_monitor_handler, manager); |
0bed242c | 732 | if (r < 0) |
e2130348 | 733 | return log_error_errno(r, "Failed to start device monitor: %m"); |
912541b0 | 734 | |
e2130348 YW |
735 | /* Process first device */ |
736 | (void) worker_device_monitor_handler(monitor, dev, manager); | |
912541b0 | 737 | |
e2130348 YW |
738 | r = sd_event_loop(manager->event); |
739 | if (r < 0) | |
740 | return log_error_errno(r, "Event loop failed: %m"); | |
741 | ||
44dcf454 | 742 | return 0; |
0bed242c YW |
743 | } |
744 | ||
419ec631 | 745 | static int on_event_timeout(sd_event_source *s, uint64_t usec, void *userdata) { |
99534007 | 746 | Event *event = ASSERT_PTR(userdata); |
419ec631 | 747 | |
419ec631 YW |
748 | assert(event->worker); |
749 | ||
750 | kill_and_sigcont(event->worker->pid, arg_timeout_signal); | |
751 | event->worker->state = WORKER_KILLED; | |
752 | ||
753 | log_device_error(event->dev, "Worker ["PID_FMT"] processing SEQNUM=%"PRIu64" killed", event->worker->pid, event->seqnum); | |
754 | ||
755 | return 1; | |
756 | } | |
757 | ||
758 | static int on_event_timeout_warning(sd_event_source *s, uint64_t usec, void *userdata) { | |
99534007 | 759 | Event *event = ASSERT_PTR(userdata); |
419ec631 | 760 | |
419ec631 YW |
761 | assert(event->worker); |
762 | ||
763 | log_device_warning(event->dev, "Worker ["PID_FMT"] processing SEQNUM=%"PRIu64" is taking a long time", event->worker->pid, event->seqnum); | |
764 | ||
765 | return 1; | |
766 | } | |
767 | ||
768 | static void worker_attach_event(Worker *worker, Event *event) { | |
769 | sd_event *e; | |
770 | ||
771 | assert(worker); | |
772 | assert(worker->manager); | |
773 | assert(event); | |
774 | assert(!event->worker); | |
775 | assert(!worker->event); | |
776 | ||
777 | worker->state = WORKER_RUNNING; | |
778 | worker->event = event; | |
779 | event->state = EVENT_RUNNING; | |
780 | event->worker = worker; | |
781 | ||
782 | e = worker->manager->event; | |
783 | ||
784 | (void) sd_event_add_time_relative(e, &event->timeout_warning_event, CLOCK_MONOTONIC, | |
785 | udev_warn_timeout(arg_event_timeout_usec), USEC_PER_SEC, | |
786 | on_event_timeout_warning, event); | |
787 | ||
788 | (void) sd_event_add_time_relative(e, &event->timeout_event, CLOCK_MONOTONIC, | |
789 | arg_event_timeout_usec, USEC_PER_SEC, | |
790 | on_event_timeout, event); | |
791 | } | |
792 | ||
d9239923 | 793 | static int worker_spawn(Manager *manager, Event *event) { |
7f2e3a14 | 794 | _cleanup_(sd_device_monitor_unrefp) sd_device_monitor *worker_monitor = NULL; |
d9239923 | 795 | Worker *worker; |
0bed242c | 796 | pid_t pid; |
7443654e | 797 | int r; |
0bed242c YW |
798 | |
799 | /* listen for new events */ | |
7f2e3a14 YW |
800 | r = device_monitor_new_full(&worker_monitor, MONITOR_GROUP_NONE, -1); |
801 | if (r < 0) | |
802 | return r; | |
7443654e | 803 | |
f714ecd4 YW |
804 | (void) sd_device_monitor_set_description(worker_monitor, "worker"); |
805 | ||
0bed242c | 806 | /* allow the main daemon netlink address to send devices to the worker */ |
7f2e3a14 YW |
807 | r = device_monitor_allow_unicast_sender(worker_monitor, manager->monitor); |
808 | if (r < 0) | |
809 | return log_error_errno(r, "Worker: Failed to set unicast sender: %m"); | |
810 | ||
811 | r = device_monitor_enable_receiving(worker_monitor); | |
0bed242c | 812 | if (r < 0) |
7f2e3a14 | 813 | return log_error_errno(r, "Worker: Failed to enable receiving of device: %m"); |
0bed242c | 814 | |
e955a7f4 | 815 | r = safe_fork("(udev-worker)", FORK_DEATHSIG, &pid); |
7443654e YW |
816 | if (r < 0) { |
817 | event->state = EVENT_QUEUED; | |
818 | return log_error_errno(r, "Failed to fork() worker: %m"); | |
819 | } | |
820 | if (r == 0) { | |
19b761a0 | 821 | DEVICE_TRACE_POINT(worker_spawned, event->dev, getpid_cached()); |
b428efa5 | 822 | |
7443654e | 823 | /* Worker process */ |
eb546b35 | 824 | r = worker_main(manager, worker_monitor, sd_device_ref(event->dev)); |
baa30fbc | 825 | log_close(); |
8b46c3fc | 826 | _exit(r < 0 ? EXIT_FAILURE : EXIT_SUCCESS); |
912541b0 | 827 | } |
e03c7cc2 | 828 | |
7443654e YW |
829 | r = worker_new(&worker, manager, worker_monitor, pid); |
830 | if (r < 0) | |
831 | return log_error_errno(r, "Failed to create worker object: %m"); | |
e03c7cc2 | 832 | |
7443654e | 833 | worker_attach_event(worker, event); |
39c19cf1 | 834 | |
eb546b35 | 835 | log_device_debug(event->dev, "Worker ["PID_FMT"] is forked for processing SEQNUM=%"PRIu64".", pid, event->seqnum); |
7443654e | 836 | return 0; |
7fafc032 KS |
837 | } |
838 | ||
f2a5412b | 839 | static int event_run(Event *event) { |
5406c368 | 840 | static bool log_children_max_reached = true; |
f2a5412b | 841 | Manager *manager; |
d9239923 | 842 | Worker *worker; |
7f2e3a14 | 843 | int r; |
912541b0 | 844 | |
c0c6806b | 845 | assert(event); |
f2a5412b | 846 | assert(event->manager); |
c0c6806b | 847 | |
b2d9e58f | 848 | log_device_uevent(event->dev, "Device ready for processing"); |
7600dbb8 | 849 | |
4f294ffd YW |
850 | (void) event_source_disable(event->retry_event_source); |
851 | ||
f2a5412b | 852 | manager = event->manager; |
90e74a66 | 853 | HASHMAP_FOREACH(worker, manager->workers) { |
912541b0 KS |
854 | if (worker->state != WORKER_IDLE) |
855 | continue; | |
856 | ||
eb546b35 | 857 | r = device_monitor_send_device(manager->monitor, worker->monitor, event->dev); |
7f2e3a14 | 858 | if (r < 0) { |
eb546b35 | 859 | log_device_error_errno(event->dev, r, "Worker ["PID_FMT"] did not accept message, killing the worker: %m", |
7f2e3a14 | 860 | worker->pid); |
cb542e84 | 861 | (void) kill(worker->pid, SIGKILL); |
912541b0 KS |
862 | worker->state = WORKER_KILLED; |
863 | continue; | |
864 | } | |
39c19cf1 | 865 | worker_attach_event(worker, event); |
f2a5412b | 866 | return 1; /* event is now processing. */ |
912541b0 KS |
867 | } |
868 | ||
c0c6806b | 869 | if (hashmap_size(manager->workers) >= arg_children_max) { |
5406c368 FB |
870 | /* Avoid spamming the debug logs if the limit is already reached and |
871 | * many events still need to be processed */ | |
872 | if (log_children_max_reached && arg_children_max > 1) { | |
044497e2 | 873 | log_debug("Maximum number (%u) of children reached.", hashmap_size(manager->workers)); |
5406c368 FB |
874 | log_children_max_reached = false; |
875 | } | |
f2a5412b | 876 | return 0; /* no free worker */ |
912541b0 KS |
877 | } |
878 | ||
5406c368 FB |
879 | /* Re-enable the debug message for the next batch of events */ |
880 | log_children_max_reached = true; | |
881 | ||
912541b0 | 882 | /* start new worker and pass initial device */ |
f2a5412b YW |
883 | r = worker_spawn(manager, event); |
884 | if (r < 0) | |
885 | return r; | |
886 | ||
887 | return 1; /* event is now processing. */ | |
1e03b754 KS |
888 | } |
889 | ||
a1fa99d8 | 890 | static int event_is_blocked(Event *event) { |
03677889 | 891 | Event *loop_event = NULL; |
29d02458 | 892 | int r; |
eb546b35 | 893 | |
a1fa99d8 YW |
894 | /* lookup event for identical, parent, child device */ |
895 | ||
044ac33c YW |
896 | assert(event); |
897 | assert(event->manager); | |
898 | assert(event->blocker_seqnum <= event->seqnum); | |
899 | ||
5d354e52 YW |
900 | if (event->retry_again_next_usec > 0) { |
901 | usec_t now_usec; | |
902 | ||
ba4e0427 | 903 | r = sd_event_now(event->manager->event, CLOCK_BOOTTIME, &now_usec); |
5d354e52 YW |
904 | if (r < 0) |
905 | return r; | |
906 | ||
400e3d21 | 907 | if (event->retry_again_next_usec > now_usec) |
5d354e52 YW |
908 | return true; |
909 | } | |
910 | ||
044ac33c YW |
911 | if (event->blocker_seqnum == event->seqnum) |
912 | /* we have checked previously and no blocker found */ | |
913 | return false; | |
914 | ||
03677889 YW |
915 | LIST_FOREACH(event, e, event->manager->events) { |
916 | loop_event = e; | |
917 | ||
044ac33c YW |
918 | /* we already found a later event, earlier cannot block us, no need to check again */ |
919 | if (loop_event->seqnum < event->blocker_seqnum) | |
920 | continue; | |
921 | ||
922 | /* event we checked earlier still exists, no need to check again */ | |
923 | if (loop_event->seqnum == event->blocker_seqnum) | |
924 | return true; | |
925 | ||
926 | /* found ourself, no later event can block us */ | |
927 | if (loop_event->seqnum >= event->seqnum) | |
928 | goto no_blocker; | |
929 | ||
930 | /* found event we have not checked */ | |
931 | break; | |
932 | } | |
933 | ||
934 | assert(loop_event); | |
935 | assert(loop_event->seqnum > event->blocker_seqnum && | |
936 | loop_event->seqnum < event->seqnum); | |
937 | ||
912541b0 | 938 | /* check if queue contains events we depend on */ |
03677889 | 939 | LIST_FOREACH(event, e, loop_event) { |
03677889 YW |
940 | loop_event = e; |
941 | ||
912541b0 KS |
942 | /* found ourself, no later event can block us */ |
943 | if (loop_event->seqnum >= event->seqnum) | |
044ac33c | 944 | goto no_blocker; |
912541b0 | 945 | |
29d02458 | 946 | if (streq_ptr(loop_event->id, event->id)) |
a1fa99d8 | 947 | break; |
912541b0 | 948 | |
a1af9668 YW |
949 | if (devpath_conflict(event->devpath, loop_event->devpath) || |
950 | devpath_conflict(event->devpath, loop_event->devpath_old) || | |
951 | devpath_conflict(event->devpath_old, loop_event->devpath)) | |
a1fa99d8 | 952 | break; |
912541b0 | 953 | |
34458dbb | 954 | if (event->devnode && streq_ptr(event->devnode, loop_event->devnode)) |
a1fa99d8 | 955 | break; |
912541b0 KS |
956 | } |
957 | ||
a1fa99d8 | 958 | assert(loop_event); |
0bd0407e | 959 | |
7600dbb8 UKK |
960 | log_device_debug(event->dev, "SEQNUM=%" PRIu64 " blocked by SEQNUM=%" PRIu64, |
961 | event->seqnum, loop_event->seqnum); | |
962 | ||
a1fa99d8 | 963 | event->blocker_seqnum = loop_event->seqnum; |
0bd0407e | 964 | return true; |
044ac33c YW |
965 | |
966 | no_blocker: | |
967 | event->blocker_seqnum = event->seqnum; | |
968 | return false; | |
7fafc032 KS |
969 | } |
970 | ||
0744e74c | 971 | static int event_queue_start(Manager *manager) { |
0725c4b9 | 972 | int r; |
8ab44e3f | 973 | |
c0c6806b TG |
974 | assert(manager); |
975 | ||
64903d18 | 976 | if (!manager->events || manager->exit || manager->stop_exec_queue) |
0744e74c | 977 | return 0; |
7c4c7e89 | 978 | |
10551728 YW |
979 | /* To make the stack directory /run/udev/links cleaned up later. */ |
980 | manager->udev_node_needs_cleanup = true; | |
981 | ||
0725c4b9 YW |
982 | r = event_source_disable(manager->kill_workers_event); |
983 | if (r < 0) | |
984 | log_warning_errno(r, "Failed to disable event source for cleaning up idle workers, ignoring: %m"); | |
eca195ec | 985 | |
e9d1fae3 | 986 | manager_reload(manager, /* force = */ false); |
c02fb804 | 987 | |
80a226b2 | 988 | LIST_FOREACH(event, event, manager->events) { |
912541b0 KS |
989 | if (event->state != EVENT_QUEUED) |
990 | continue; | |
0bc74ea7 | 991 | |
c6f78234 YW |
992 | /* do not start event if parent or child event is still running or queued */ |
993 | r = event_is_blocked(event); | |
2d40f02e YW |
994 | if (r > 0) |
995 | continue; | |
0c3d8182 | 996 | if (r < 0) |
c6f78234 | 997 | log_device_warning_errno(event->dev, r, |
2d40f02e YW |
998 | "Failed to check dependencies for event (SEQNUM=%"PRIu64", ACTION=%s), " |
999 | "assuming there is no blocking event, ignoring: %m", | |
c6f78234 | 1000 | event->seqnum, |
0c3d8182 | 1001 | strna(device_action_to_string(event->action))); |
fc465079 | 1002 | |
f2a5412b | 1003 | r = event_run(event); |
2d40f02e | 1004 | if (r <= 0) /* 0 means there are no idle workers. Let's escape from the loop. */ |
f2a5412b | 1005 | return r; |
912541b0 | 1006 | } |
0744e74c YW |
1007 | |
1008 | return 0; | |
1e03b754 KS |
1009 | } |
1010 | ||
4f294ffd YW |
1011 | static int on_event_retry(sd_event_source *s, uint64_t usec, void *userdata) { |
1012 | /* This does nothing. The on_post() callback will start the event if there exists an idle worker. */ | |
1013 | return 1; | |
1014 | } | |
1015 | ||
5d354e52 YW |
1016 | static int event_requeue(Event *event) { |
1017 | usec_t now_usec; | |
1018 | int r; | |
1019 | ||
1020 | assert(event); | |
1021 | assert(event->manager); | |
1022 | assert(event->manager->event); | |
1023 | ||
1024 | event->timeout_warning_event = sd_event_source_disable_unref(event->timeout_warning_event); | |
1025 | event->timeout_event = sd_event_source_disable_unref(event->timeout_event); | |
1026 | ||
1027 | /* add a short delay to suppress busy loop */ | |
ba4e0427 | 1028 | r = sd_event_now(event->manager->event, CLOCK_BOOTTIME, &now_usec); |
5d354e52 YW |
1029 | if (r < 0) |
1030 | return log_device_warning_errno(event->dev, r, | |
1031 | "Failed to get current time, " | |
1032 | "skipping event (SEQNUM=%"PRIu64", ACTION=%s): %m", | |
1033 | event->seqnum, strna(device_action_to_string(event->action))); | |
1034 | ||
1035 | if (event->retry_again_timeout_usec > 0 && event->retry_again_timeout_usec <= now_usec) | |
1036 | return log_device_warning_errno(event->dev, SYNTHETIC_ERRNO(ETIMEDOUT), | |
1037 | "The underlying block device is locked by a process more than %s, " | |
1038 | "skipping event (SEQNUM=%"PRIu64", ACTION=%s).", | |
1039 | FORMAT_TIMESPAN(EVENT_RETRY_TIMEOUT_USEC, USEC_PER_MINUTE), | |
1040 | event->seqnum, strna(device_action_to_string(event->action))); | |
1041 | ||
1042 | event->retry_again_next_usec = usec_add(now_usec, EVENT_RETRY_INTERVAL_USEC); | |
1043 | if (event->retry_again_timeout_usec == 0) | |
1044 | event->retry_again_timeout_usec = usec_add(now_usec, EVENT_RETRY_TIMEOUT_USEC); | |
1045 | ||
4f294ffd YW |
1046 | r = event_reset_time_relative(event->manager->event, &event->retry_event_source, |
1047 | CLOCK_MONOTONIC, EVENT_RETRY_INTERVAL_USEC, 0, | |
1048 | on_event_retry, NULL, | |
1049 | 0, "retry-event", true); | |
1050 | if (r < 0) | |
1051 | return log_device_warning_errno(event->dev, r, "Failed to reset timer event source for retrying event, " | |
1052 | "skipping event (SEQNUM=%"PRIu64", ACTION=%s): %m", | |
1053 | event->seqnum, strna(device_action_to_string(event->action))); | |
1054 | ||
5d354e52 YW |
1055 | if (event->worker && event->worker->event == event) |
1056 | event->worker->event = NULL; | |
1057 | event->worker = NULL; | |
1058 | ||
1059 | event->state = EVENT_QUEUED; | |
1060 | return 0; | |
1061 | } | |
1062 | ||
82a5de9f YW |
1063 | static int event_queue_assume_block_device_unlocked(Manager *manager, sd_device *dev) { |
1064 | const char *devname; | |
1065 | int r; | |
1066 | ||
1067 | /* When a new event for a block device is queued or we get an inotify event, assume that the | |
1068 | * device is not locked anymore. The assumption may not be true, but that should not cause any | |
1069 | * issues, as in that case events will be requeued soon. */ | |
1070 | ||
78e278ad | 1071 | r = device_get_whole_disk(dev, NULL, &devname); |
82a5de9f YW |
1072 | if (r <= 0) |
1073 | return r; | |
1074 | ||
1075 | LIST_FOREACH(event, event, manager->events) { | |
1076 | const char *event_devname; | |
1077 | ||
1078 | if (event->state != EVENT_QUEUED) | |
1079 | continue; | |
1080 | ||
1081 | if (event->retry_again_next_usec == 0) | |
1082 | continue; | |
1083 | ||
78e278ad | 1084 | if (device_get_whole_disk(event->dev, NULL, &event_devname) <= 0) |
82a5de9f YW |
1085 | continue; |
1086 | ||
1087 | if (!streq(devname, event_devname)) | |
1088 | continue; | |
1089 | ||
1090 | event->retry_again_next_usec = 0; | |
1091 | } | |
1092 | ||
1093 | return 0; | |
1094 | } | |
1095 | ||
419ec631 | 1096 | static int event_queue_insert(Manager *manager, sd_device *dev) { |
34458dbb | 1097 | const char *devpath, *devpath_old = NULL, *id = NULL, *devnode = NULL; |
0c3d8182 | 1098 | sd_device_action_t action; |
419ec631 | 1099 | uint64_t seqnum; |
c9473aaa | 1100 | Event *event; |
419ec631 | 1101 | int r; |
ff2c503d | 1102 | |
419ec631 YW |
1103 | assert(manager); |
1104 | assert(dev); | |
ff2c503d | 1105 | |
419ec631 YW |
1106 | /* only one process can add events to the queue */ |
1107 | assert(manager->pid == getpid_cached()); | |
1108 | ||
1109 | /* We only accepts devices received by device monitor. */ | |
1110 | r = sd_device_get_seqnum(dev, &seqnum); | |
1111 | if (r < 0) | |
1112 | return r; | |
1113 | ||
0c3d8182 YW |
1114 | r = sd_device_get_action(dev, &action); |
1115 | if (r < 0) | |
1116 | return r; | |
1117 | ||
29d02458 YW |
1118 | r = sd_device_get_devpath(dev, &devpath); |
1119 | if (r < 0) | |
1120 | return r; | |
1121 | ||
1122 | r = sd_device_get_property_value(dev, "DEVPATH_OLD", &devpath_old); | |
1123 | if (r < 0 && r != -ENOENT) | |
1124 | return r; | |
1125 | ||
1126 | r = device_get_device_id(dev, &id); | |
1127 | if (r < 0 && r != -ENOENT) | |
1128 | return r; | |
1129 | ||
34458dbb YW |
1130 | r = sd_device_get_devname(dev, &devnode); |
1131 | if (r < 0 && r != -ENOENT) | |
1132 | return r; | |
1133 | ||
419ec631 YW |
1134 | event = new(Event, 1); |
1135 | if (!event) | |
1136 | return -ENOMEM; | |
1137 | ||
1138 | *event = (Event) { | |
1139 | .manager = manager, | |
1140 | .dev = sd_device_ref(dev), | |
419ec631 | 1141 | .seqnum = seqnum, |
0c3d8182 | 1142 | .action = action, |
29d02458 YW |
1143 | .id = id, |
1144 | .devpath = devpath, | |
1145 | .devpath_old = devpath_old, | |
34458dbb | 1146 | .devnode = devnode, |
419ec631 YW |
1147 | .state = EVENT_QUEUED, |
1148 | }; | |
1149 | ||
64903d18 | 1150 | if (!manager->events) { |
419ec631 YW |
1151 | r = touch("/run/udev/queue"); |
1152 | if (r < 0) | |
6be97d67 | 1153 | log_warning_errno(r, "Failed to touch /run/udev/queue, ignoring: %m"); |
912541b0 | 1154 | } |
419ec631 YW |
1155 | |
1156 | LIST_APPEND(event, manager->events, event); | |
1157 | ||
1158 | log_device_uevent(dev, "Device is queued"); | |
1159 | ||
1160 | return 0; | |
1161 | } | |
1162 | ||
1163 | static int on_uevent(sd_device_monitor *monitor, sd_device *dev, void *userdata) { | |
99534007 | 1164 | Manager *manager = ASSERT_PTR(userdata); |
419ec631 YW |
1165 | int r; |
1166 | ||
419ec631 YW |
1167 | DEVICE_TRACE_POINT(kernel_uevent_received, dev); |
1168 | ||
1169 | device_ensure_usec_initialized(dev, NULL); | |
1170 | ||
1171 | r = event_queue_insert(manager, dev); | |
1172 | if (r < 0) { | |
1173 | log_device_error_errno(dev, r, "Failed to insert device into event queue: %m"); | |
1174 | return 1; | |
1175 | } | |
1176 | ||
82a5de9f YW |
1177 | (void) event_queue_assume_block_device_unlocked(manager, dev); |
1178 | ||
419ec631 | 1179 | return 1; |
ff2c503d KS |
1180 | } |
1181 | ||
e82e8fa5 | 1182 | static int on_worker(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
99534007 | 1183 | Manager *manager = ASSERT_PTR(userdata); |
c0c6806b | 1184 | |
912541b0 | 1185 | for (;;) { |
a79cba33 | 1186 | EventResult result; |
5d354e52 | 1187 | struct iovec iovec = IOVEC_MAKE(&result, sizeof(result)); |
fb29cdbe | 1188 | CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(struct ucred))) control; |
979558f3 TG |
1189 | struct msghdr msghdr = { |
1190 | .msg_iov = &iovec, | |
1191 | .msg_iovlen = 1, | |
1192 | .msg_control = &control, | |
1193 | .msg_controllen = sizeof(control), | |
1194 | }; | |
912541b0 | 1195 | ssize_t size; |
371d72e0 | 1196 | struct ucred *ucred; |
d9239923 | 1197 | Worker *worker; |
912541b0 | 1198 | |
3691bcf3 LP |
1199 | size = recvmsg_safe(fd, &msghdr, MSG_DONTWAIT); |
1200 | if (size == -EINTR) | |
1201 | continue; | |
1202 | if (size == -EAGAIN) | |
1203 | /* nothing more to read */ | |
1204 | break; | |
1205 | if (size < 0) | |
1206 | return log_error_errno(size, "Failed to receive message: %m"); | |
1207 | ||
1208 | cmsg_close_all(&msghdr); | |
979558f3 | 1209 | |
6467bda5 | 1210 | if (size != sizeof(result)) { |
d4e98880 | 1211 | log_warning("Ignoring worker message with invalid size %zi bytes", size); |
e82e8fa5 | 1212 | continue; |
979558f3 TG |
1213 | } |
1214 | ||
371d72e0 | 1215 | ucred = CMSG_FIND_DATA(&msghdr, SOL_SOCKET, SCM_CREDENTIALS, struct ucred); |
979558f3 | 1216 | if (!ucred || ucred->pid <= 0) { |
d4e98880 | 1217 | log_warning("Ignoring worker message without valid PID"); |
979558f3 TG |
1218 | continue; |
1219 | } | |
912541b0 KS |
1220 | |
1221 | /* lookup worker who sent the signal */ | |
4a0b58c4 | 1222 | worker = hashmap_get(manager->workers, PID_TO_PTR(ucred->pid)); |
a505965d | 1223 | if (!worker) { |
044497e2 | 1224 | log_debug("Worker ["PID_FMT"] returned, but is no longer tracked", ucred->pid); |
a505965d | 1225 | continue; |
912541b0 | 1226 | } |
c0bbfd72 | 1227 | |
f257a8fc YG |
1228 | if (worker->state == WORKER_KILLING) { |
1229 | worker->state = WORKER_KILLED; | |
1230 | (void) kill(worker->pid, SIGTERM); | |
1231 | } else if (worker->state != WORKER_KILLED) | |
a505965d TG |
1232 | worker->state = WORKER_IDLE; |
1233 | ||
1234 | /* worker returned */ | |
5d354e52 YW |
1235 | if (result == EVENT_RESULT_TRY_AGAIN && |
1236 | event_requeue(worker->event) < 0) | |
6467bda5 | 1237 | device_broadcast(manager->monitor, worker->event->dev, -ETIMEDOUT); |
5d354e52 YW |
1238 | |
1239 | /* When event_requeue() succeeds, worker->event is NULL, and event_free() handles NULL gracefully. */ | |
a505965d | 1240 | event_free(worker->event); |
912541b0 | 1241 | } |
e82e8fa5 TG |
1242 | |
1243 | return 1; | |
1244 | } | |
1245 | ||
3b47c739 | 1246 | /* receive the udevd message from userspace */ |
e0d61dac | 1247 | static int on_ctrl_msg(UdevCtrl *uctrl, UdevCtrlMessageType type, const UdevCtrlMessageValue *value, void *userdata) { |
99534007 | 1248 | Manager *manager = ASSERT_PTR(userdata); |
d02c6f54 | 1249 | int r; |
912541b0 | 1250 | |
d02c6f54 | 1251 | assert(value); |
e4f66b77 | 1252 | |
d02c6f54 YW |
1253 | switch (type) { |
1254 | case UDEV_CTRL_SET_LOG_LEVEL: | |
53c8590f YW |
1255 | if ((value->intval & LOG_PRIMASK) != value->intval) { |
1256 | log_debug("Received invalid udev control message (SET_LOG_LEVEL, %i), ignoring.", value->intval); | |
1257 | break; | |
1258 | } | |
1259 | ||
64a3494c | 1260 | log_debug("Received udev control message (SET_LOG_LEVEL), setting log_level=%i", value->intval); |
53c8590f YW |
1261 | |
1262 | r = log_get_max_level(); | |
1263 | if (r == value->intval) | |
1264 | break; | |
1265 | ||
3cc6b14a | 1266 | log_set_max_level(value->intval); |
1a0bd015 | 1267 | manager->log_level = value->intval; |
f257a8fc | 1268 | manager_kill_workers(manager, false); |
d02c6f54 YW |
1269 | break; |
1270 | case UDEV_CTRL_STOP_EXEC_QUEUE: | |
044497e2 | 1271 | log_debug("Received udev control message (STOP_EXEC_QUEUE)"); |
c0c6806b | 1272 | manager->stop_exec_queue = true; |
d02c6f54 YW |
1273 | break; |
1274 | case UDEV_CTRL_START_EXEC_QUEUE: | |
044497e2 | 1275 | log_debug("Received udev control message (START_EXEC_QUEUE)"); |
c0c6806b | 1276 | manager->stop_exec_queue = false; |
d7bddfa1 | 1277 | /* It is not necessary to call event_queue_start() here, as it will be called in on_post() if necessary. */ |
d02c6f54 YW |
1278 | break; |
1279 | case UDEV_CTRL_RELOAD: | |
044497e2 | 1280 | log_debug("Received udev control message (RELOAD)"); |
e9d1fae3 | 1281 | manager_reload(manager, /* force = */ true); |
d02c6f54 YW |
1282 | break; |
1283 | case UDEV_CTRL_SET_ENV: { | |
d7ac0952 FS |
1284 | _unused_ _cleanup_free_ char *old_val = NULL; |
1285 | _cleanup_free_ char *key = NULL, *val = NULL, *old_key = NULL; | |
d02c6f54 | 1286 | const char *eq; |
9b5150b6 | 1287 | |
d02c6f54 | 1288 | eq = strchr(value->buf, '='); |
9b5150b6 | 1289 | if (!eq) { |
d02c6f54 | 1290 | log_error("Invalid key format '%s'", value->buf); |
9b5150b6 YW |
1291 | return 1; |
1292 | } | |
1293 | ||
d02c6f54 | 1294 | key = strndup(value->buf, eq - value->buf); |
9b5150b6 YW |
1295 | if (!key) { |
1296 | log_oom(); | |
1297 | return 1; | |
1298 | } | |
1299 | ||
1300 | old_val = hashmap_remove2(manager->properties, key, (void **) &old_key); | |
1301 | ||
1302 | r = hashmap_ensure_allocated(&manager->properties, &string_hash_ops); | |
1303 | if (r < 0) { | |
1304 | log_oom(); | |
1305 | return 1; | |
912541b0 | 1306 | } |
9b5150b6 YW |
1307 | |
1308 | eq++; | |
f053fc33 | 1309 | if (isempty(eq)) { |
044497e2 | 1310 | log_debug("Received udev control message (ENV), unsetting '%s'", key); |
9b5150b6 YW |
1311 | |
1312 | r = hashmap_put(manager->properties, key, NULL); | |
1313 | if (r < 0) { | |
1314 | log_oom(); | |
1315 | return 1; | |
1316 | } | |
1317 | } else { | |
1318 | val = strdup(eq); | |
1319 | if (!val) { | |
1320 | log_oom(); | |
1321 | return 1; | |
1322 | } | |
1323 | ||
044497e2 | 1324 | log_debug("Received udev control message (ENV), setting '%s=%s'", key, val); |
9b5150b6 YW |
1325 | |
1326 | r = hashmap_put(manager->properties, key, val); | |
1327 | if (r < 0) { | |
1328 | log_oom(); | |
1329 | return 1; | |
1330 | } | |
1331 | } | |
1332 | ||
1333 | key = val = NULL; | |
f257a8fc | 1334 | manager_kill_workers(manager, false); |
d02c6f54 | 1335 | break; |
912541b0 | 1336 | } |
d02c6f54 YW |
1337 | case UDEV_CTRL_SET_CHILDREN_MAX: |
1338 | if (value->intval <= 0) { | |
1339 | log_debug("Received invalid udev control message (SET_MAX_CHILDREN, %i), ignoring.", value->intval); | |
1340 | return 0; | |
1341 | } | |
912541b0 | 1342 | |
d02c6f54 YW |
1343 | log_debug("Received udev control message (SET_MAX_CHILDREN), setting children_max=%i", value->intval); |
1344 | arg_children_max = value->intval; | |
1ef72b55 | 1345 | |
4bf4f50f | 1346 | notify_ready(); |
d02c6f54 YW |
1347 | break; |
1348 | case UDEV_CTRL_PING: | |
d30f43ee | 1349 | log_debug("Received udev control message (PING)"); |
d02c6f54 YW |
1350 | break; |
1351 | case UDEV_CTRL_EXIT: | |
044497e2 | 1352 | log_debug("Received udev control message (EXIT)"); |
62d43dac | 1353 | manager_exit(manager); |
d02c6f54 YW |
1354 | break; |
1355 | default: | |
1356 | log_debug("Received unknown udev control message, ignoring"); | |
912541b0 | 1357 | } |
e4f66b77 | 1358 | |
e82e8fa5 | 1359 | return 1; |
88f4b648 | 1360 | } |
4a231017 | 1361 | |
25677a05 | 1362 | static int synthesize_change_one(sd_device *dev, sd_device *target) { |
0584b17a ZJS |
1363 | int r; |
1364 | ||
25677a05 YW |
1365 | if (DEBUG_LOGGING) { |
1366 | const char *syspath = NULL; | |
1367 | (void) sd_device_get_syspath(target, &syspath); | |
1368 | log_device_debug(dev, "device is closed, synthesising 'change' on %s", strna(syspath)); | |
1369 | } | |
1370 | ||
1371 | r = sd_device_trigger(target, SD_DEVICE_CHANGE); | |
0584b17a | 1372 | if (r < 0) |
25677a05 YW |
1373 | return log_device_debug_errno(target, r, "Failed to trigger 'change' uevent: %m"); |
1374 | ||
b428efa5 MS |
1375 | DEVICE_TRACE_POINT(synthetic_change_event, dev); |
1376 | ||
0584b17a ZJS |
1377 | return 0; |
1378 | } | |
1379 | ||
70068602 | 1380 | static int synthesize_change(sd_device *dev) { |
2f9d2317 YW |
1381 | _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL; |
1382 | bool part_table_read; | |
1383 | const char *sysname; | |
2f9d2317 | 1384 | int r, k; |
edd32000 | 1385 | |
2f9d2317 | 1386 | r = sd_device_get_sysname(dev, &sysname); |
70068602 YW |
1387 | if (r < 0) |
1388 | return r; | |
1389 | ||
2f9d2317 YW |
1390 | if (startswith(sysname, "dm-") || block_device_is_whole_disk(dev) <= 0) |
1391 | return synthesize_change_one(dev, dev); | |
1392 | ||
1393 | r = blockdev_reread_partition_table(dev); | |
70068602 | 1394 | if (r < 0) |
2f9d2317 YW |
1395 | log_device_debug_errno(dev, r, "Failed to re-read partition table, ignoring: %m"); |
1396 | part_table_read = r >= 0; | |
70068602 | 1397 | |
2f9d2317 YW |
1398 | /* search for partitions */ |
1399 | r = partition_enumerator_new(dev, &e); | |
70068602 YW |
1400 | if (r < 0) |
1401 | return r; | |
1402 | ||
2f9d2317 YW |
1403 | /* We have partitions and re-read the table, the kernel already sent out a "change" |
1404 | * event for the disk, and "remove/add" for all partitions. */ | |
1405 | if (part_table_read && sd_device_enumerator_get_device_first(e)) | |
1406 | return 0; | |
e9fc29f4 | 1407 | |
2f9d2317 YW |
1408 | /* We have partitions but re-reading the partition table did not work, synthesize |
1409 | * "change" for the disk and all partitions. */ | |
1410 | r = synthesize_change_one(dev, dev); | |
1411 | FOREACH_DEVICE(e, d) { | |
1412 | k = synthesize_change_one(dev, d); | |
1413 | if (k < 0 && r >= 0) | |
1414 | r = k; | |
1415 | } | |
ede34445 | 1416 | |
2f9d2317 | 1417 | return r; |
edd32000 KS |
1418 | } |
1419 | ||
e82e8fa5 | 1420 | static int on_inotify(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
ea8213dc | 1421 | Manager *manager = ASSERT_PTR(userdata); |
0254e944 | 1422 | union inotify_event_buffer buffer; |
f7c1ad4f | 1423 | ssize_t l; |
0725c4b9 | 1424 | int r; |
912541b0 | 1425 | |
e82e8fa5 | 1426 | l = read(fd, &buffer, sizeof(buffer)); |
f7c1ad4f | 1427 | if (l < 0) { |
8add30a0 | 1428 | if (ERRNO_IS_TRANSIENT(errno)) |
ea8213dc | 1429 | return 0; |
912541b0 | 1430 | |
f7c1ad4f | 1431 | return log_error_errno(errno, "Failed to read inotify fd: %m"); |
912541b0 KS |
1432 | } |
1433 | ||
00adc340 | 1434 | FOREACH_INOTIFY_EVENT_WARN(e, buffer, l) { |
70068602 YW |
1435 | _cleanup_(sd_device_unrefp) sd_device *dev = NULL; |
1436 | const char *devnode; | |
1437 | ||
cd66f972 YW |
1438 | /* Do not handle IN_IGNORED here. Especially, do not try to call udev_watch_end() from the |
1439 | * main process. Otherwise, the pair of the symlinks may become inconsistent, and several | |
1440 | * garbage may remain. The old symlinks are removed by a worker that processes the | |
1441 | * corresponding 'remove' uevent; | |
1442 | * udev_event_execute_rules() -> event_execute_rules_on_remove() -> udev_watch_end(). */ | |
1443 | ||
1444 | if (!FLAGS_SET(e->mask, IN_CLOSE_WRITE)) | |
1445 | continue; | |
1446 | ||
e7f781e4 YW |
1447 | r = device_new_from_watch_handle(&dev, e->wd); |
1448 | if (r < 0) { | |
cd66f972 | 1449 | /* Device may be removed just after closed. */ |
e7f781e4 | 1450 | log_debug_errno(r, "Failed to create sd_device object from watch handle, ignoring: %m"); |
70068602 | 1451 | continue; |
e7f781e4 | 1452 | } |
912541b0 | 1453 | |
cd66f972 YW |
1454 | r = sd_device_get_devname(dev, &devnode); |
1455 | if (r < 0) { | |
1456 | /* Also here, device may be already removed. */ | |
1457 | log_device_debug_errno(dev, r, "Failed to get device node, ignoring: %m"); | |
edd32000 | 1458 | continue; |
82a5de9f | 1459 | } |
e7f781e4 | 1460 | |
cd66f972 YW |
1461 | log_device_debug(dev, "Received inotify event for %s.", devnode); |
1462 | ||
1463 | (void) event_queue_assume_block_device_unlocked(manager, dev); | |
1464 | (void) synthesize_change(dev); | |
912541b0 KS |
1465 | } |
1466 | ||
ea8213dc | 1467 | return 0; |
bd284db1 SJR |
1468 | } |
1469 | ||
0561329d | 1470 | static int on_sigterm(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
99534007 | 1471 | Manager *manager = ASSERT_PTR(userdata); |
c0c6806b | 1472 | |
62d43dac | 1473 | manager_exit(manager); |
912541b0 | 1474 | |
e82e8fa5 TG |
1475 | return 1; |
1476 | } | |
912541b0 | 1477 | |
0561329d | 1478 | static int on_sighup(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
99534007 | 1479 | Manager *manager = ASSERT_PTR(userdata); |
c0c6806b | 1480 | |
e9d1fae3 | 1481 | manager_reload(manager, /* force = */ true); |
912541b0 | 1482 | |
e82e8fa5 TG |
1483 | return 1; |
1484 | } | |
912541b0 | 1485 | |
82e0b631 YW |
1486 | static int on_sigchld(sd_event_source *s, const siginfo_t *si, void *userdata) { |
1487 | Worker *worker = ASSERT_PTR(userdata); | |
1488 | Manager *manager = ASSERT_PTR(worker->manager); | |
1489 | sd_device *dev = worker->event ? ASSERT_PTR(worker->event->dev) : NULL; | |
1490 | EventResult result; | |
c0c6806b | 1491 | |
82e0b631 | 1492 | assert(si); |
e82e8fa5 | 1493 | |
82e0b631 YW |
1494 | switch (si->si_code) { |
1495 | case CLD_EXITED: | |
1496 | if (si->si_status == 0) | |
1497 | log_device_debug(dev, "Worker ["PID_FMT"] exited.", si->si_pid); | |
1498 | else | |
1499 | log_device_warning(dev, "Worker ["PID_FMT"] exited with return code %i.", | |
1500 | si->si_pid, si->si_status); | |
1501 | result = EVENT_RESULT_EXIT_STATUS_BASE + si->si_status; | |
1502 | break; | |
e82e8fa5 | 1503 | |
82e0b631 YW |
1504 | case CLD_KILLED: |
1505 | case CLD_DUMPED: | |
1506 | log_device_warning(dev, "Worker ["PID_FMT"] terminated by signal %i (%s).", | |
1507 | si->si_pid, si->si_status, signal_to_string(si->si_status)); | |
1508 | result = EVENT_RESULT_SIGNAL_BASE + si->si_status; | |
1509 | break; | |
dc7faf2a | 1510 | |
82e0b631 YW |
1511 | default: |
1512 | assert_not_reached(); | |
1513 | } | |
dc7faf2a | 1514 | |
82e0b631 YW |
1515 | if (result != EVENT_RESULT_SUCCESS && dev) { |
1516 | /* delete state from disk */ | |
1517 | device_delete_db(dev); | |
1518 | device_tag_index(dev, NULL, false); | |
e82e8fa5 | 1519 | |
82e0b631 YW |
1520 | /* Forward kernel event to libudev listeners */ |
1521 | device_broadcast(manager->monitor, dev, result); | |
912541b0 | 1522 | } |
e82e8fa5 | 1523 | |
82e0b631 YW |
1524 | worker_free(worker); |
1525 | ||
e82e8fa5 | 1526 | return 1; |
f27125f9 | 1527 | } |
1528 | ||
693d371d | 1529 | static int on_post(sd_event_source *s, void *userdata) { |
99534007 | 1530 | Manager *manager = ASSERT_PTR(userdata); |
693d371d | 1531 | |
64903d18 | 1532 | if (manager->events) { |
5d354e52 YW |
1533 | /* Try to process pending events if idle workers exist. Why is this necessary? |
1534 | * When a worker finished an event and became idle, even if there was a pending event, | |
1535 | * the corresponding device might have been locked and the processing of the event | |
1536 | * delayed for a while, preventing the worker from processing the event immediately. | |
1537 | * Now, the device may be unlocked. Let's try again! */ | |
1538 | event_queue_start(manager); | |
b6107f01 | 1539 | return 1; |
5d354e52 | 1540 | } |
b6107f01 | 1541 | |
40293280 YW |
1542 | /* There are no queued events. Let's remove /run/udev/queue and clean up the idle processes. */ |
1543 | ||
1544 | if (unlink("/run/udev/queue") < 0) { | |
1545 | if (errno != ENOENT) | |
1546 | log_warning_errno(errno, "Failed to unlink /run/udev/queue, ignoring: %m"); | |
1547 | } else | |
1548 | log_debug("No events are queued, removing /run/udev/queue."); | |
b6107f01 YW |
1549 | |
1550 | if (!hashmap_isempty(manager->workers)) { | |
1551 | /* There are idle workers */ | |
8e543eb8 YW |
1552 | (void) event_reset_time_relative(manager->event, &manager->kill_workers_event, |
1553 | CLOCK_MONOTONIC, 3 * USEC_PER_SEC, USEC_PER_SEC, | |
1554 | on_kill_workers_event, manager, | |
1555 | 0, "kill-workers-event", false); | |
b6107f01 | 1556 | return 1; |
693d371d TG |
1557 | } |
1558 | ||
b6107f01 YW |
1559 | /* There are no idle workers. */ |
1560 | ||
10551728 YW |
1561 | if (manager->udev_node_needs_cleanup) { |
1562 | (void) udev_node_cleanup(); | |
1563 | manager->udev_node_needs_cleanup = false; | |
1564 | } | |
1565 | ||
b6107f01 YW |
1566 | if (manager->exit) |
1567 | return sd_event_exit(manager->event, 0); | |
1568 | ||
42670846 YW |
1569 | if (manager->cgroup) |
1570 | /* cleanup possible left-over processes in our cgroup */ | |
1571 | (void) cg_kill(SYSTEMD_CGROUP_CONTROLLER, manager->cgroup, SIGKILL, CGROUP_IGNORE_SELF, NULL, NULL, NULL); | |
b6107f01 | 1572 | |
693d371d TG |
1573 | return 1; |
1574 | } | |
1575 | ||
c4b69e99 | 1576 | static int listen_fds(int *ret_ctrl, int *ret_netlink) { |
254d1313 | 1577 | int ctrl_fd = -EBADF, netlink_fd = -EBADF; |
c4b69e99 | 1578 | int fd, n; |
912541b0 | 1579 | |
c4b69e99 YW |
1580 | assert(ret_ctrl); |
1581 | assert(ret_netlink); | |
fcff1e72 | 1582 | |
912541b0 | 1583 | n = sd_listen_fds(true); |
fcff1e72 TG |
1584 | if (n < 0) |
1585 | return n; | |
912541b0 KS |
1586 | |
1587 | for (fd = SD_LISTEN_FDS_START; fd < n + SD_LISTEN_FDS_START; fd++) { | |
618b3642 | 1588 | if (sd_is_socket(fd, AF_UNIX, SOCK_SEQPACKET, -1) > 0) { |
fcff1e72 TG |
1589 | if (ctrl_fd >= 0) |
1590 | return -EINVAL; | |
1591 | ctrl_fd = fd; | |
912541b0 KS |
1592 | continue; |
1593 | } | |
1594 | ||
c52cff07 | 1595 | if (sd_is_socket(fd, AF_NETLINK, SOCK_RAW, -1) > 0) { |
fcff1e72 TG |
1596 | if (netlink_fd >= 0) |
1597 | return -EINVAL; | |
1598 | netlink_fd = fd; | |
912541b0 KS |
1599 | continue; |
1600 | } | |
1601 | ||
fcff1e72 | 1602 | return -EINVAL; |
912541b0 KS |
1603 | } |
1604 | ||
c4b69e99 YW |
1605 | *ret_ctrl = ctrl_fd; |
1606 | *ret_netlink = netlink_fd; | |
912541b0 | 1607 | |
912541b0 | 1608 | return 0; |
7459bcdc KS |
1609 | } |
1610 | ||
e6f86cac | 1611 | /* |
3f85ef0f | 1612 | * read the kernel command line, in case we need to get into debug mode |
64a3494c | 1613 | * udev.log_level=<level> syslog priority |
1d84ad94 LP |
1614 | * udev.children_max=<number of workers> events are fully serialized if set to 1 |
1615 | * udev.exec_delay=<number of seconds> delay execution of every executed program | |
1616 | * udev.event_timeout=<number of seconds> seconds to wait before terminating an event | |
95ac5230 | 1617 | * udev.blockdev_read_only<=bool> mark all block devices read-only when they appear |
e6f86cac | 1618 | */ |
96287a49 | 1619 | static int parse_proc_cmdline_item(const char *key, const char *value, void *data) { |
95ac5230 | 1620 | int r; |
e6f86cac | 1621 | |
614a823c | 1622 | assert(key); |
e6f86cac | 1623 | |
64a3494c FB |
1624 | if (proc_cmdline_key_streq(key, "udev.log_level") || |
1625 | proc_cmdline_key_streq(key, "udev.log_priority")) { /* kept for backward compatibility */ | |
1d84ad94 LP |
1626 | |
1627 | if (proc_cmdline_value_missing(key, value)) | |
1628 | return 0; | |
1629 | ||
46f0fbd8 | 1630 | r = log_level_from_string(value); |
92e72467 ZJS |
1631 | if (r >= 0) |
1632 | log_set_max_level(r); | |
1d84ad94 LP |
1633 | |
1634 | } else if (proc_cmdline_key_streq(key, "udev.event_timeout")) { | |
1635 | ||
1636 | if (proc_cmdline_value_missing(key, value)) | |
1637 | return 0; | |
1638 | ||
9d9264ba | 1639 | r = parse_sec(value, &arg_event_timeout_usec); |
1d84ad94 LP |
1640 | |
1641 | } else if (proc_cmdline_key_streq(key, "udev.children_max")) { | |
1642 | ||
1643 | if (proc_cmdline_value_missing(key, value)) | |
1644 | return 0; | |
1645 | ||
020328e1 | 1646 | r = safe_atou(value, &arg_children_max); |
1d84ad94 LP |
1647 | |
1648 | } else if (proc_cmdline_key_streq(key, "udev.exec_delay")) { | |
1649 | ||
1650 | if (proc_cmdline_value_missing(key, value)) | |
1651 | return 0; | |
1652 | ||
6b92f429 | 1653 | r = parse_sec(value, &arg_exec_delay_usec); |
1d84ad94 | 1654 | |
e2099267 | 1655 | } else if (proc_cmdline_key_streq(key, "udev.timeout_signal")) { |
95ac5230 | 1656 | |
e2099267 MS |
1657 | if (proc_cmdline_value_missing(key, value)) |
1658 | return 0; | |
1659 | ||
1660 | r = signal_from_string(value); | |
1661 | if (r > 0) | |
1662 | arg_timeout_signal = r; | |
95ac5230 LP |
1663 | |
1664 | } else if (proc_cmdline_key_streq(key, "udev.blockdev_read_only")) { | |
1665 | ||
1666 | if (!value) | |
1667 | arg_blockdev_read_only = true; | |
1668 | else { | |
1669 | r = parse_boolean(value); | |
1670 | if (r < 0) | |
1671 | log_warning_errno(r, "Failed to parse udev.blockdev-read-only argument, ignoring: %s", value); | |
1672 | else | |
1673 | arg_blockdev_read_only = r; | |
1674 | } | |
1675 | ||
1676 | if (arg_blockdev_read_only) | |
1677 | log_notice("All physical block devices will be marked read-only."); | |
1678 | ||
1679 | return 0; | |
1680 | ||
1681 | } else { | |
1682 | if (startswith(key, "udev.")) | |
1683 | log_warning("Unknown udev kernel command line option \"%s\", ignoring.", key); | |
1684 | ||
1685 | return 0; | |
1686 | } | |
614a823c | 1687 | |
92e72467 ZJS |
1688 | if (r < 0) |
1689 | log_warning_errno(r, "Failed to parse \"%s=%s\", ignoring: %m", key, value); | |
1d84ad94 | 1690 | |
614a823c | 1691 | return 0; |
e6f86cac KS |
1692 | } |
1693 | ||
37ec0fdd LP |
1694 | static int help(void) { |
1695 | _cleanup_free_ char *link = NULL; | |
1696 | int r; | |
1697 | ||
1698 | r = terminal_urlify_man("systemd-udevd.service", "8", &link); | |
1699 | if (r < 0) | |
1700 | return log_oom(); | |
1701 | ||
ed216e1f | 1702 | printf("%s [OPTIONS...]\n\n" |
d1109e12 | 1703 | "Rule-based manager for device events and files.\n\n" |
5ac0162c | 1704 | " -h --help Print this message\n" |
2d19c17e MF |
1705 | " -V --version Print version of the program\n" |
1706 | " -d --daemon Detach and run in the background\n" | |
1707 | " -D --debug Enable debug output\n" | |
1708 | " -c --children-max=INT Set maximum number of workers\n" | |
1709 | " -e --exec-delay=SECONDS Seconds to wait before executing RUN=\n" | |
1710 | " -t --event-timeout=SECONDS Seconds to wait before terminating an event\n" | |
1711 | " -N --resolve-names=early|late|never\n" | |
5ac0162c | 1712 | " When to resolve users and groups\n" |
bc556335 DDM |
1713 | "\nSee the %s for details.\n", |
1714 | program_invocation_short_name, | |
1715 | link); | |
37ec0fdd LP |
1716 | |
1717 | return 0; | |
ed216e1f TG |
1718 | } |
1719 | ||
bba7a484 | 1720 | static int parse_argv(int argc, char *argv[]) { |
e2099267 MS |
1721 | enum { |
1722 | ARG_TIMEOUT_SIGNAL, | |
1723 | }; | |
1724 | ||
912541b0 | 1725 | static const struct option options[] = { |
e2099267 MS |
1726 | { "daemon", no_argument, NULL, 'd' }, |
1727 | { "debug", no_argument, NULL, 'D' }, | |
1728 | { "children-max", required_argument, NULL, 'c' }, | |
1729 | { "exec-delay", required_argument, NULL, 'e' }, | |
1730 | { "event-timeout", required_argument, NULL, 't' }, | |
1731 | { "resolve-names", required_argument, NULL, 'N' }, | |
1732 | { "help", no_argument, NULL, 'h' }, | |
1733 | { "version", no_argument, NULL, 'V' }, | |
1734 | { "timeout-signal", required_argument, NULL, ARG_TIMEOUT_SIGNAL }, | |
912541b0 KS |
1735 | {} |
1736 | }; | |
689a97f5 | 1737 | |
044497e2 | 1738 | int c, r; |
689a97f5 | 1739 | |
bba7a484 TG |
1740 | assert(argc >= 0); |
1741 | assert(argv); | |
912541b0 | 1742 | |
e14b6f21 | 1743 | while ((c = getopt_long(argc, argv, "c:de:Dt:N:hV", options, NULL)) >= 0) { |
bba7a484 | 1744 | switch (c) { |
912541b0 | 1745 | |
912541b0 | 1746 | case 'd': |
bba7a484 | 1747 | arg_daemonize = true; |
912541b0 KS |
1748 | break; |
1749 | case 'c': | |
020328e1 | 1750 | r = safe_atou(optarg, &arg_children_max); |
6f5cf8a8 | 1751 | if (r < 0) |
389f9bf2 | 1752 | log_warning_errno(r, "Failed to parse --children-max= value '%s', ignoring: %m", optarg); |
912541b0 KS |
1753 | break; |
1754 | case 'e': | |
6b92f429 | 1755 | r = parse_sec(optarg, &arg_exec_delay_usec); |
6f5cf8a8 | 1756 | if (r < 0) |
6b92f429 | 1757 | log_warning_errno(r, "Failed to parse --exec-delay= value '%s', ignoring: %m", optarg); |
912541b0 | 1758 | break; |
e2099267 MS |
1759 | case ARG_TIMEOUT_SIGNAL: |
1760 | r = signal_from_string(optarg); | |
1761 | if (r <= 0) | |
1762 | log_warning_errno(r, "Failed to parse --timeout-signal= value '%s', ignoring: %m", optarg); | |
1763 | else | |
1764 | arg_timeout_signal = r; | |
1765 | ||
1766 | break; | |
9719859c | 1767 | case 't': |
9d9264ba | 1768 | r = parse_sec(optarg, &arg_event_timeout_usec); |
f1e8664e | 1769 | if (r < 0) |
9d9264ba | 1770 | log_warning_errno(r, "Failed to parse --event-timeout= value '%s', ignoring: %m", optarg); |
9719859c | 1771 | break; |
912541b0 | 1772 | case 'D': |
bba7a484 | 1773 | arg_debug = true; |
912541b0 | 1774 | break; |
c4d44cba YW |
1775 | case 'N': { |
1776 | ResolveNameTiming t; | |
1777 | ||
1778 | t = resolve_name_timing_from_string(optarg); | |
1779 | if (t < 0) | |
1780 | log_warning("Invalid --resolve-names= value '%s', ignoring.", optarg); | |
1781 | else | |
1782 | arg_resolve_name_timing = t; | |
912541b0 | 1783 | break; |
c4d44cba | 1784 | } |
912541b0 | 1785 | case 'h': |
37ec0fdd | 1786 | return help(); |
912541b0 | 1787 | case 'V': |
681bd2c5 | 1788 | printf("%s\n", GIT_VERSION); |
bba7a484 TG |
1789 | return 0; |
1790 | case '?': | |
1791 | return -EINVAL; | |
912541b0 | 1792 | default: |
04499a70 | 1793 | assert_not_reached(); |
bba7a484 | 1794 | |
912541b0 KS |
1795 | } |
1796 | } | |
1797 | ||
bba7a484 TG |
1798 | return 1; |
1799 | } | |
1800 | ||
a1f4fd38 | 1801 | static int manager_new(Manager **ret, int fd_ctrl, int fd_uevent) { |
c0c6806b | 1802 | _cleanup_(manager_freep) Manager *manager = NULL; |
a1f4fd38 | 1803 | _cleanup_free_ char *cgroup = NULL; |
b5af8c8c | 1804 | int r; |
c0c6806b TG |
1805 | |
1806 | assert(ret); | |
1807 | ||
6f19b42f | 1808 | manager = new(Manager, 1); |
c0c6806b TG |
1809 | if (!manager) |
1810 | return log_oom(); | |
1811 | ||
6f19b42f | 1812 | *manager = (Manager) { |
254d1313 | 1813 | .inotify_fd = -EBADF, |
19ee48a6 | 1814 | .worker_watch = PIPE_EBADF, |
6f19b42f | 1815 | }; |
e237d8cb | 1816 | |
100bc5bf YW |
1817 | r = udev_ctrl_new_from_fd(&manager->ctrl, fd_ctrl); |
1818 | if (r < 0) | |
1819 | return log_error_errno(r, "Failed to initialize udev control socket: %m"); | |
e237d8cb | 1820 | |
b5af8c8c ZJS |
1821 | r = udev_ctrl_enable_receiving(manager->ctrl); |
1822 | if (r < 0) | |
1823 | return log_error_errno(r, "Failed to bind udev control socket: %m"); | |
c4b69e99 | 1824 | |
7f2e3a14 YW |
1825 | r = device_monitor_new_full(&manager->monitor, MONITOR_GROUP_KERNEL, fd_uevent); |
1826 | if (r < 0) | |
1827 | return log_error_errno(r, "Failed to initialize device monitor: %m"); | |
e237d8cb | 1828 | |
1ffadeaa FB |
1829 | /* Bump receiver buffer, but only if we are not called via socket activation, as in that |
1830 | * case systemd sets the receive buffer size for us, and the value in the .socket unit | |
1831 | * should take full effect. */ | |
e77f52e5 YW |
1832 | if (fd_uevent < 0) { |
1833 | r = sd_device_monitor_set_receive_buffer_size(manager->monitor, 128 * 1024 * 1024); | |
1834 | if (r < 0) | |
1835 | log_warning_errno(r, "Failed to set receive buffer size for device monitor, ignoring: %m"); | |
1836 | } | |
c4b69e99 | 1837 | |
f714ecd4 YW |
1838 | (void) sd_device_monitor_set_description(manager->monitor, "manager"); |
1839 | ||
b5af8c8c ZJS |
1840 | r = device_monitor_enable_receiving(manager->monitor); |
1841 | if (r < 0) | |
1842 | return log_error_errno(r, "Failed to bind netlink socket: %m"); | |
1843 | ||
1a0bd015 YW |
1844 | manager->log_level = log_get_max_level(); |
1845 | ||
f8371dbd LP |
1846 | r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 0, &cgroup); |
1847 | if (r < 0) | |
1848 | log_warning_errno(r, "Failed to get cgroup, ignoring: %m"); | |
1849 | else if (endswith(cgroup, "/udev")) { /* If we are in a subcgroup /udev/ we assume it was delegated to us */ | |
1850 | log_debug("Running in delegated subcgroup '%s'.", cgroup); | |
1851 | manager->cgroup = TAKE_PTR(cgroup); | |
1852 | } | |
1853 | ||
b5af8c8c ZJS |
1854 | *ret = TAKE_PTR(manager); |
1855 | ||
1856 | return 0; | |
1857 | } | |
1858 | ||
1859 | static int main_loop(Manager *manager) { | |
d02c6f54 | 1860 | int fd_worker, r; |
b5af8c8c | 1861 | |
76e62a4d YW |
1862 | manager->pid = getpid_cached(); |
1863 | ||
e237d8cb | 1864 | /* unnamed socket from workers to the main daemon */ |
618b3642 | 1865 | r = socketpair(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0, manager->worker_watch); |
e237d8cb | 1866 | if (r < 0) |
044497e2 | 1867 | return log_error_errno(errno, "Failed to create socketpair for communicating with workers: %m"); |
e237d8cb | 1868 | |
693d371d | 1869 | fd_worker = manager->worker_watch[READ_END]; |
e237d8cb | 1870 | |
2ff48e98 | 1871 | r = setsockopt_int(fd_worker, SOL_SOCKET, SO_PASSCRED, true); |
e237d8cb | 1872 | if (r < 0) |
044497e2 | 1873 | return log_error_errno(r, "Failed to enable SO_PASSCRED: %m"); |
e237d8cb | 1874 | |
df7ee959 YW |
1875 | manager->inotify_fd = inotify_init1(IN_CLOEXEC); |
1876 | if (manager->inotify_fd < 0) | |
1877 | return log_error_errno(errno, "Failed to create inotify descriptor: %m"); | |
e237d8cb | 1878 | |
df7ee959 | 1879 | udev_watch_restore(manager->inotify_fd); |
e237d8cb TG |
1880 | |
1881 | /* block and listen to all signals on signalfd */ | |
79d905af | 1882 | assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, SIGHUP, SIGCHLD, SIGRTMIN+18, -1) >= 0); |
693d371d | 1883 | |
49f997f3 TG |
1884 | r = sd_event_default(&manager->event); |
1885 | if (r < 0) | |
044497e2 | 1886 | return log_error_errno(r, "Failed to allocate event loop: %m"); |
49f997f3 | 1887 | |
693d371d TG |
1888 | r = sd_event_add_signal(manager->event, NULL, SIGINT, on_sigterm, manager); |
1889 | if (r < 0) | |
044497e2 | 1890 | return log_error_errno(r, "Failed to create SIGINT event source: %m"); |
693d371d TG |
1891 | |
1892 | r = sd_event_add_signal(manager->event, NULL, SIGTERM, on_sigterm, manager); | |
1893 | if (r < 0) | |
044497e2 | 1894 | return log_error_errno(r, "Failed to create SIGTERM event source: %m"); |
693d371d TG |
1895 | |
1896 | r = sd_event_add_signal(manager->event, NULL, SIGHUP, on_sighup, manager); | |
1897 | if (r < 0) | |
044497e2 | 1898 | return log_error_errno(r, "Failed to create SIGHUP event source: %m"); |
693d371d | 1899 | |
693d371d TG |
1900 | r = sd_event_set_watchdog(manager->event, true); |
1901 | if (r < 0) | |
044497e2 | 1902 | return log_error_errno(r, "Failed to create watchdog event source: %m"); |
693d371d | 1903 | |
d02c6f54 YW |
1904 | r = udev_ctrl_attach_event(manager->ctrl, manager->event); |
1905 | if (r < 0) | |
1906 | return log_error_errno(r, "Failed to attach event to udev control: %m"); | |
b5af8c8c | 1907 | |
d02c6f54 | 1908 | r = udev_ctrl_start(manager->ctrl, on_ctrl_msg, manager); |
693d371d | 1909 | if (r < 0) |
d02c6f54 | 1910 | return log_error_errno(r, "Failed to start device monitor: %m"); |
693d371d TG |
1911 | |
1912 | /* This needs to be after the inotify and uevent handling, to make sure | |
1913 | * that the ping is send back after fully processing the pending uevents | |
1914 | * (including the synthetic ones we may create due to inotify events). | |
1915 | */ | |
d02c6f54 | 1916 | r = sd_event_source_set_priority(udev_ctrl_get_event_source(manager->ctrl), SD_EVENT_PRIORITY_IDLE); |
693d371d | 1917 | if (r < 0) |
044497e2 | 1918 | return log_error_errno(r, "Failed to set IDLE event priority for udev control event source: %m"); |
693d371d | 1919 | |
df7ee959 | 1920 | r = sd_event_add_io(manager->event, &manager->inotify_event, manager->inotify_fd, EPOLLIN, on_inotify, manager); |
693d371d | 1921 | if (r < 0) |
044497e2 | 1922 | return log_error_errno(r, "Failed to create inotify event source: %m"); |
693d371d | 1923 | |
f00d2b6d YW |
1924 | r = sd_device_monitor_attach_event(manager->monitor, manager->event); |
1925 | if (r < 0) | |
1926 | return log_error_errno(r, "Failed to attach event to device monitor: %m"); | |
1927 | ||
1928 | r = sd_device_monitor_start(manager->monitor, on_uevent, manager); | |
693d371d | 1929 | if (r < 0) |
f00d2b6d YW |
1930 | return log_error_errno(r, "Failed to start device monitor: %m"); |
1931 | ||
693d371d TG |
1932 | r = sd_event_add_io(manager->event, NULL, fd_worker, EPOLLIN, on_worker, manager); |
1933 | if (r < 0) | |
044497e2 | 1934 | return log_error_errno(r, "Failed to create worker event source: %m"); |
693d371d TG |
1935 | |
1936 | r = sd_event_add_post(manager->event, NULL, on_post, manager); | |
1937 | if (r < 0) | |
044497e2 | 1938 | return log_error_errno(r, "Failed to create post event source: %m"); |
e237d8cb | 1939 | |
79d905af LP |
1940 | /* Eventually, we probably want to do more here on memory pressure, for example, kill idle workers immediately */ |
1941 | r = sd_event_add_memory_pressure(manager->event, &manager->memory_pressure_event_source, NULL, NULL); | |
1942 | if (r < 0) | |
1943 | log_full_errno(ERRNO_IS_NOT_SUPPORTED(r) || ERRNO_IS_PRIVILEGE(r) || (r == -EHOSTDOWN) ? LOG_DEBUG : LOG_WARNING, r, | |
1944 | "Failed to allocate memory pressure watch, ignoring: %m"); | |
1945 | ||
1946 | r = sd_event_add_signal(manager->event, &manager->memory_pressure_event_source, SIGRTMIN+18, sigrtmin18_handler, NULL); | |
1947 | if (r < 0) | |
1948 | return log_error_errno(r, "Failed to allocate SIGRTMIN+18 event source, ignoring: %m"); | |
1949 | ||
e9d1fae3 YW |
1950 | manager->last_usec = now(CLOCK_MONOTONIC); |
1951 | ||
b5af8c8c | 1952 | udev_builtin_init(); |
077fc5e2 | 1953 | |
c238a1f5 | 1954 | r = udev_rules_load(&manager->rules, arg_resolve_name_timing); |
298316eb | 1955 | if (r < 0) |
b5af8c8c | 1956 | return log_error_errno(r, "Failed to read udev rules: %m"); |
077fc5e2 DH |
1957 | |
1958 | r = udev_rules_apply_static_dev_perms(manager->rules); | |
1959 | if (r < 0) | |
6e40ed53 | 1960 | log_warning_errno(r, "Failed to apply permissions on static device nodes, ignoring: %m"); |
077fc5e2 | 1961 | |
4bf4f50f | 1962 | notify_ready(); |
077fc5e2 DH |
1963 | |
1964 | r = sd_event_loop(manager->event); | |
44dcf454 | 1965 | if (r < 0) |
044497e2 | 1966 | log_error_errno(r, "Event loop failed: %m"); |
077fc5e2 | 1967 | |
f8433153 | 1968 | (void) sd_notify(/* unset= */ false, NOTIFY_STOPPING); |
077fc5e2 DH |
1969 | return r; |
1970 | } | |
1971 | ||
63e2d171 | 1972 | int run_udevd(int argc, char *argv[]) { |
b5af8c8c | 1973 | _cleanup_(manager_freep) Manager *manager = NULL; |
254d1313 | 1974 | int fd_ctrl = -EBADF, fd_uevent = -EBADF; |
e5d7bce1 | 1975 | int r; |
bba7a484 | 1976 | |
bba7a484 | 1977 | log_set_target(LOG_TARGET_AUTO); |
6b413782 | 1978 | log_open(); |
e2099267 | 1979 | udev_parse_config_full(&arg_children_max, &arg_exec_delay_usec, &arg_event_timeout_usec, &arg_resolve_name_timing, &arg_timeout_signal); |
bba7a484 | 1980 | log_parse_environment(); |
6b413782 | 1981 | log_open(); /* Done again to update after reading configuration. */ |
bba7a484 | 1982 | |
bba7a484 TG |
1983 | r = parse_argv(argc, argv); |
1984 | if (r <= 0) | |
0c5a109a | 1985 | return r; |
bba7a484 | 1986 | |
1d84ad94 | 1987 | r = proc_cmdline_parse(parse_proc_cmdline_item, NULL, PROC_CMDLINE_STRIP_RD_PREFIX); |
614a823c | 1988 | if (r < 0) |
044497e2 | 1989 | log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m"); |
912541b0 | 1990 | |
78d3e041 KS |
1991 | if (arg_debug) { |
1992 | log_set_target(LOG_TARGET_CONSOLE); | |
bba7a484 | 1993 | log_set_max_level(LOG_DEBUG); |
78d3e041 | 1994 | } |
bba7a484 | 1995 | |
fba868fa LP |
1996 | r = must_be_root(); |
1997 | if (r < 0) | |
0c5a109a | 1998 | return r; |
912541b0 | 1999 | |
712cebf1 | 2000 | if (arg_children_max == 0) { |
fe56acd8 | 2001 | unsigned long cpu_limit, mem_limit, cpu_count = 1; |
d457ff83 | 2002 | |
fe56acd8 LP |
2003 | r = cpus_in_affinity_mask(); |
2004 | if (r < 0) | |
2005 | log_warning_errno(r, "Failed to determine number of local CPUs, ignoring: %m"); | |
2006 | else | |
2007 | cpu_count = r; | |
88bd5a32 FB |
2008 | |
2009 | cpu_limit = cpu_count * 2 + 16; | |
2010 | mem_limit = MAX(physical_memory() / (128UL*1024*1024), 10U); | |
912541b0 | 2011 | |
88bd5a32 FB |
2012 | arg_children_max = MIN(cpu_limit, mem_limit); |
2013 | arg_children_max = MIN(WORKER_NUM_MAX, arg_children_max); | |
e438c57a | 2014 | |
044497e2 | 2015 | log_debug("Set children_max to %u", arg_children_max); |
d457ff83 | 2016 | } |
912541b0 | 2017 | |
712cebf1 | 2018 | /* set umask before creating any file/directory */ |
712cebf1 | 2019 | umask(022); |
912541b0 | 2020 | |
a452c807 | 2021 | r = mac_init(); |
0c5a109a | 2022 | if (r < 0) |
a9ba0e32 | 2023 | return r; |
912541b0 | 2024 | |
3f692e2e | 2025 | r = RET_NERRNO(mkdir("/run/udev", 0755)); |
0c5a109a ZJS |
2026 | if (r < 0 && r != -EEXIST) |
2027 | return log_error_errno(r, "Failed to create /run/udev: %m"); | |
712cebf1 | 2028 | |
b7f74dd4 | 2029 | r = listen_fds(&fd_ctrl, &fd_uevent); |
0c5a109a ZJS |
2030 | if (r < 0) |
2031 | return log_error_errno(r, "Failed to listen on fds: %m"); | |
b7f74dd4 | 2032 | |
a1f4fd38 | 2033 | r = manager_new(&manager, fd_ctrl, fd_uevent); |
b5af8c8c ZJS |
2034 | if (r < 0) |
2035 | return log_error_errno(r, "Failed to create manager: %m"); | |
2036 | ||
bba7a484 | 2037 | if (arg_daemonize) { |
912541b0 | 2038 | pid_t pid; |
912541b0 | 2039 | |
2751ad9c | 2040 | log_info("Starting systemd-udevd version " GIT_VERSION); |
3cbb2057 | 2041 | |
40e749b5 | 2042 | /* connect /dev/null to stdin, stdout, stderr */ |
c76cf844 AK |
2043 | if (log_get_max_level() < LOG_DEBUG) { |
2044 | r = make_null_stdio(); | |
2045 | if (r < 0) | |
2046 | log_warning_errno(r, "Failed to redirect standard streams to /dev/null: %m"); | |
2047 | } | |
2048 | ||
912541b0 | 2049 | pid = fork(); |
0c5a109a ZJS |
2050 | if (pid < 0) |
2051 | return log_error_errno(errno, "Failed to fork daemon: %m"); | |
2052 | if (pid > 0) | |
2053 | /* parent */ | |
2054 | return 0; | |
912541b0 | 2055 | |
0c5a109a | 2056 | /* child */ |
ece0fe12 | 2057 | (void) setsid(); |
7500cd5e | 2058 | } |
912541b0 | 2059 | |
76e62a4d | 2060 | return main_loop(manager); |
7fafc032 | 2061 | } |