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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" |
618234a5 | 34 | #include "cpu-set-util.h" |
5ba2dc25 | 35 | #include "dev-setup.h" |
7f2e3a14 | 36 | #include "device-monitor-private.h" |
abde5ea8 | 37 | #include "device-private.h" |
70068602 | 38 | #include "device-util.h" |
6467bda5 | 39 | #include "errno-list.h" |
6d63048a | 40 | #include "event-util.h" |
3ffd4af2 | 41 | #include "fd-util.h" |
a5c32cff | 42 | #include "fileio.h" |
f97b34a6 | 43 | #include "format-util.h" |
f4f15635 | 44 | #include "fs-util.h" |
a505965d | 45 | #include "hashmap.h" |
9e5fd717 | 46 | #include "inotify-util.h" |
c004493c | 47 | #include "io-util.h" |
eefc66aa | 48 | #include "limits-util.h" |
40a57716 | 49 | #include "list.h" |
0c5a109a | 50 | #include "main-func.h" |
5ea78a39 | 51 | #include "mkdir.h" |
618234a5 | 52 | #include "netlink-util.h" |
6bedfcbb | 53 | #include "parse-util.h" |
a1f4fd38 | 54 | #include "path-util.h" |
294bf0c3 | 55 | #include "pretty-print.h" |
4e731273 | 56 | #include "proc-cmdline.h" |
618234a5 LP |
57 | #include "process-util.h" |
58 | #include "selinux-util.h" | |
59 | #include "signal-util.h" | |
8f328d36 | 60 | #include "socket-util.h" |
07630cea | 61 | #include "string-util.h" |
49fe5c09 | 62 | #include "strv.h" |
5ea78a39 | 63 | #include "strxcpyx.h" |
46f0fbd8 | 64 | #include "syslog-util.h" |
63e2d171 | 65 | #include "udevd.h" |
07a26e42 | 66 | #include "udev-builtin.h" |
7d68eb1b | 67 | #include "udev-ctrl.h" |
25de7aa7 | 68 | #include "udev-event.h" |
10551728 | 69 | #include "udev-node.h" |
618234a5 | 70 | #include "udev-util.h" |
70068602 | 71 | #include "udev-watch.h" |
ee104e11 | 72 | #include "user-util.h" |
47350c5f | 73 | #include "version.h" |
7fafc032 | 74 | |
88bd5a32 | 75 | #define WORKER_NUM_MAX 2048U |
5d354e52 YW |
76 | #define EVENT_RETRY_INTERVAL_USEC (200 * USEC_PER_MSEC) |
77 | #define EVENT_RETRY_TIMEOUT_USEC (3 * USEC_PER_MINUTE) | |
88bd5a32 | 78 | |
bba7a484 TG |
79 | static bool arg_debug = false; |
80 | static int arg_daemonize = false; | |
c4d44cba | 81 | static ResolveNameTiming arg_resolve_name_timing = RESOLVE_NAME_EARLY; |
216e8bbe | 82 | static unsigned arg_children_max = 0; |
6b92f429 | 83 | static usec_t arg_exec_delay_usec = 0; |
bba7a484 | 84 | static usec_t arg_event_timeout_usec = 180 * USEC_PER_SEC; |
e2099267 | 85 | static int arg_timeout_signal = SIGKILL; |
95ac5230 | 86 | static bool arg_blockdev_read_only = false; |
c0c6806b | 87 | |
d9239923 YW |
88 | typedef struct Event Event; |
89 | typedef struct Worker Worker; | |
90 | ||
c0c6806b | 91 | typedef struct Manager { |
693d371d | 92 | sd_event *event; |
c0c6806b | 93 | Hashmap *workers; |
d9239923 | 94 | LIST_HEAD(Event, events); |
a1f4fd38 | 95 | char *cgroup; |
cb49a4f2 | 96 | pid_t pid; /* the process that originally allocated the manager object */ |
1a0bd015 | 97 | int log_level; |
c0c6806b | 98 | |
9a07157d | 99 | UdevRules *rules; |
9b5150b6 | 100 | Hashmap *properties; |
c0c6806b | 101 | |
0bed242c YW |
102 | sd_netlink *rtnl; |
103 | ||
7f2e3a14 | 104 | sd_device_monitor *monitor; |
e0d61dac | 105 | UdevCtrl *ctrl; |
e237d8cb TG |
106 | int worker_watch[2]; |
107 | ||
df7ee959 YW |
108 | /* used by udev-watch */ |
109 | int inotify_fd; | |
693d371d | 110 | sd_event_source *inotify_event; |
df7ee959 | 111 | |
eca195ec | 112 | sd_event_source *kill_workers_event; |
693d371d | 113 | |
7c4c7e89 TG |
114 | usec_t last_usec; |
115 | ||
10551728 | 116 | bool udev_node_needs_cleanup; |
481f24d1 YW |
117 | bool stop_exec_queue; |
118 | bool exit; | |
c0c6806b | 119 | } Manager; |
1e03b754 | 120 | |
d9239923 | 121 | typedef enum EventState { |
912541b0 KS |
122 | EVENT_UNDEF, |
123 | EVENT_QUEUED, | |
124 | EVENT_RUNNING, | |
d9239923 | 125 | } EventState; |
1e03b754 | 126 | |
d9239923 | 127 | typedef struct Event { |
cb49a4f2 | 128 | Manager *manager; |
d9239923 YW |
129 | Worker *worker; |
130 | EventState state; | |
eb546b35 YW |
131 | |
132 | sd_device *dev; | |
eb546b35 | 133 | |
0c3d8182 | 134 | sd_device_action_t action; |
eb546b35 | 135 | uint64_t seqnum; |
a1fa99d8 | 136 | uint64_t blocker_seqnum; |
29d02458 YW |
137 | const char *id; |
138 | const char *devpath; | |
139 | const char *devpath_old; | |
34458dbb | 140 | const char *devnode; |
4f294ffd YW |
141 | |
142 | /* Used when the device is locked by another program. */ | |
5d354e52 YW |
143 | usec_t retry_again_next_usec; |
144 | usec_t retry_again_timeout_usec; | |
4f294ffd | 145 | sd_event_source *retry_event_source; |
d8f462b4 YW |
146 | |
147 | sd_event_source *timeout_warning_event; | |
148 | sd_event_source *timeout_event; | |
eb546b35 | 149 | |
d9239923 YW |
150 | LIST_FIELDS(Event, event); |
151 | } Event; | |
1e03b754 | 152 | |
d9239923 | 153 | typedef enum WorkerState { |
912541b0 KS |
154 | WORKER_UNDEF, |
155 | WORKER_RUNNING, | |
156 | WORKER_IDLE, | |
157 | WORKER_KILLED, | |
f257a8fc | 158 | WORKER_KILLING, |
d9239923 | 159 | } WorkerState; |
1e03b754 | 160 | |
d9239923 | 161 | typedef struct Worker { |
c0c6806b | 162 | Manager *manager; |
912541b0 | 163 | pid_t pid; |
82e0b631 | 164 | sd_event_source *child_event_source; |
7f2e3a14 | 165 | sd_device_monitor *monitor; |
d9239923 YW |
166 | WorkerState state; |
167 | Event *event; | |
168 | } Worker; | |
1e03b754 KS |
169 | |
170 | /* passed from worker to main process */ | |
5d354e52 | 171 | typedef enum EventResult { |
6467bda5 YW |
172 | EVENT_RESULT_NERRNO_MIN = -ERRNO_MAX, |
173 | EVENT_RESULT_NERRNO_MAX = -1, | |
a79cba33 | 174 | EVENT_RESULT_SUCCESS = 0, |
6467bda5 YW |
175 | EVENT_RESULT_EXIT_STATUS_BASE = 0, |
176 | EVENT_RESULT_EXIT_STATUS_MAX = 255, | |
177 | EVENT_RESULT_TRY_AGAIN = 256, /* when the block device is locked by another process. */ | |
178 | EVENT_RESULT_SIGNAL_BASE = 257, | |
179 | EVENT_RESULT_SIGNAL_MAX = EVENT_RESULT_SIGNAL_BASE + _NSIG, | |
5d354e52 | 180 | _EVENT_RESULT_MAX, |
6467bda5 | 181 | _EVENT_RESULT_INVALID = -EINVAL, |
5d354e52 | 182 | } EventResult; |
1e03b754 | 183 | |
5393c528 | 184 | static Event *event_free(Event *event) { |
c6aa11f2 | 185 | if (!event) |
5393c528 | 186 | return NULL; |
ba47b71c | 187 | |
40a57716 | 188 | assert(event->manager); |
c6aa11f2 | 189 | |
40a57716 | 190 | LIST_REMOVE(event, event->manager->events, event); |
eb546b35 | 191 | sd_device_unref(event->dev); |
c6aa11f2 | 192 | |
72151060 YW |
193 | /* Do not use sd_event_source_disable_unref() here, as this is called by both workers and the |
194 | * main process. */ | |
4f294ffd | 195 | sd_event_source_unref(event->retry_event_source); |
72151060 YW |
196 | sd_event_source_unref(event->timeout_warning_event); |
197 | sd_event_source_unref(event->timeout_event); | |
693d371d | 198 | |
c6aa11f2 TG |
199 | if (event->worker) |
200 | event->worker->event = NULL; | |
201 | ||
5393c528 | 202 | return mfree(event); |
aa8734ff | 203 | } |
7a770250 | 204 | |
419ec631 | 205 | static void event_queue_cleanup(Manager *manager, EventState match_state) { |
80a226b2 | 206 | LIST_FOREACH(event, event, manager->events) { |
419ec631 YW |
207 | if (match_state != EVENT_UNDEF && match_state != event->state) |
208 | continue; | |
209 | ||
210 | event_free(event); | |
211 | } | |
212 | } | |
213 | ||
d9239923 | 214 | static Worker *worker_free(Worker *worker) { |
c6aa11f2 | 215 | if (!worker) |
75db809a | 216 | return NULL; |
bc113de9 | 217 | |
82e0b631 YW |
218 | if (worker->manager) |
219 | hashmap_remove(worker->manager->workers, PID_TO_PTR(worker->pid)); | |
c0c6806b | 220 | |
82e0b631 | 221 | sd_event_source_unref(worker->child_event_source); |
7f2e3a14 | 222 | sd_device_monitor_unref(worker->monitor); |
c6aa11f2 TG |
223 | event_free(worker->event); |
224 | ||
75db809a | 225 | return mfree(worker); |
ff2c503d KS |
226 | } |
227 | ||
d9239923 YW |
228 | DEFINE_TRIVIAL_CLEANUP_FUNC(Worker*, worker_free); |
229 | DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(worker_hash_op, void, trivial_hash_func, trivial_compare_func, Worker, worker_free); | |
fc465079 | 230 | |
419ec631 YW |
231 | static void manager_clear_for_worker(Manager *manager) { |
232 | assert(manager); | |
233 | ||
f777e745 YW |
234 | /* Do not use sd_event_source_disable_unref() here, as this is called by both workers and the |
235 | * main process. */ | |
236 | manager->inotify_event = sd_event_source_unref(manager->inotify_event); | |
237 | manager->kill_workers_event = sd_event_source_unref(manager->kill_workers_event); | |
419ec631 YW |
238 | |
239 | manager->event = sd_event_unref(manager->event); | |
240 | ||
241 | manager->workers = hashmap_free(manager->workers); | |
242 | event_queue_cleanup(manager, EVENT_UNDEF); | |
243 | ||
244 | manager->monitor = sd_device_monitor_unref(manager->monitor); | |
245 | manager->ctrl = udev_ctrl_unref(manager->ctrl); | |
246 | ||
247 | manager->worker_watch[READ_END] = safe_close(manager->worker_watch[READ_END]); | |
248 | } | |
249 | ||
250 | static Manager* manager_free(Manager *manager) { | |
251 | if (!manager) | |
252 | return NULL; | |
253 | ||
254 | udev_builtin_exit(); | |
255 | ||
419ec631 YW |
256 | manager_clear_for_worker(manager); |
257 | ||
258 | sd_netlink_unref(manager->rtnl); | |
259 | ||
260 | hashmap_free_free_free(manager->properties); | |
261 | udev_rules_free(manager->rules); | |
262 | ||
263 | safe_close(manager->inotify_fd); | |
264 | safe_close_pair(manager->worker_watch); | |
265 | ||
a1f4fd38 | 266 | free(manager->cgroup); |
419ec631 YW |
267 | return mfree(manager); |
268 | } | |
269 | ||
270 | DEFINE_TRIVIAL_CLEANUP_FUNC(Manager*, manager_free); | |
271 | ||
82e0b631 YW |
272 | static int on_sigchld(sd_event_source *s, const siginfo_t *si, void *userdata); |
273 | ||
d9239923 YW |
274 | static int worker_new(Worker **ret, Manager *manager, sd_device_monitor *worker_monitor, pid_t pid) { |
275 | _cleanup_(worker_freep) Worker *worker = NULL; | |
a505965d | 276 | int r; |
3a19b32a TG |
277 | |
278 | assert(ret); | |
c0c6806b | 279 | assert(manager); |
3a19b32a TG |
280 | assert(worker_monitor); |
281 | assert(pid > 1); | |
282 | ||
d4053464 YW |
283 | /* close monitor, but keep address around */ |
284 | device_monitor_disconnect(worker_monitor); | |
285 | ||
d9239923 | 286 | worker = new(Worker, 1); |
3a19b32a TG |
287 | if (!worker) |
288 | return -ENOMEM; | |
289 | ||
d9239923 | 290 | *worker = (Worker) { |
d4053464 YW |
291 | .monitor = sd_device_monitor_ref(worker_monitor), |
292 | .pid = pid, | |
293 | }; | |
a505965d | 294 | |
82e0b631 YW |
295 | r = sd_event_add_child(manager->event, &worker->child_event_source, pid, WEXITED, on_sigchld, worker); |
296 | if (r < 0) | |
297 | return r; | |
298 | ||
92a74c47 | 299 | r = hashmap_ensure_put(&manager->workers, &worker_hash_op, PID_TO_PTR(pid), worker); |
a505965d TG |
300 | if (r < 0) |
301 | return r; | |
302 | ||
82e0b631 | 303 | worker->manager = manager; |
3a19b32a | 304 | |
82e0b631 | 305 | *ret = TAKE_PTR(worker); |
3a19b32a TG |
306 | return 0; |
307 | } | |
308 | ||
419ec631 YW |
309 | static void manager_kill_workers(Manager *manager, bool force) { |
310 | Worker *worker; | |
4fa4d885 | 311 | |
419ec631 | 312 | assert(manager); |
4fa4d885 | 313 | |
419ec631 YW |
314 | HASHMAP_FOREACH(worker, manager->workers) { |
315 | if (worker->state == WORKER_KILLED) | |
316 | continue; | |
4fa4d885 | 317 | |
419ec631 YW |
318 | if (worker->state == WORKER_RUNNING && !force) { |
319 | worker->state = WORKER_KILLING; | |
320 | continue; | |
321 | } | |
4fa4d885 | 322 | |
419ec631 YW |
323 | worker->state = WORKER_KILLED; |
324 | (void) kill(worker->pid, SIGTERM); | |
325 | } | |
4fa4d885 TG |
326 | } |
327 | ||
419ec631 YW |
328 | static void manager_exit(Manager *manager) { |
329 | assert(manager); | |
693d371d | 330 | |
419ec631 | 331 | manager->exit = true; |
693d371d | 332 | |
419ec631 YW |
333 | sd_notify(false, |
334 | "STOPPING=1\n" | |
335 | "STATUS=Starting shutdown..."); | |
39c19cf1 | 336 | |
419ec631 YW |
337 | /* close sources of new events and discard buffered events */ |
338 | manager->ctrl = udev_ctrl_unref(manager->ctrl); | |
0bed242c | 339 | |
9612da36 | 340 | manager->inotify_event = sd_event_source_disable_unref(manager->inotify_event); |
419ec631 | 341 | manager->inotify_fd = safe_close(manager->inotify_fd); |
0bed242c | 342 | |
7f2e3a14 | 343 | manager->monitor = sd_device_monitor_unref(manager->monitor); |
0bed242c | 344 | |
419ec631 YW |
345 | /* discard queued events and kill workers */ |
346 | event_queue_cleanup(manager, EVENT_QUEUED); | |
347 | manager_kill_workers(manager, true); | |
0bed242c YW |
348 | } |
349 | ||
4bf4f50f ZJS |
350 | static void notify_ready(void) { |
351 | int r; | |
352 | ||
353 | r = sd_notifyf(false, | |
354 | "READY=1\n" | |
355 | "STATUS=Processing with %u children at max", arg_children_max); | |
356 | if (r < 0) | |
357 | log_warning_errno(r, "Failed to send readiness notification, ignoring: %m"); | |
358 | } | |
359 | ||
419ec631 | 360 | /* reload requested, HUP signal received, rules changed, builtin changed */ |
e9d1fae3 YW |
361 | static void manager_reload(Manager *manager, bool force) { |
362 | _cleanup_(udev_rules_freep) UdevRules *rules = NULL; | |
363 | usec_t now_usec; | |
364 | int r; | |
365 | ||
419ec631 | 366 | assert(manager); |
b2d21d93 | 367 | |
e9d1fae3 YW |
368 | assert_se(sd_event_now(manager->event, CLOCK_MONOTONIC, &now_usec) >= 0); |
369 | if (!force && now_usec < usec_add(manager->last_usec, 3 * USEC_PER_SEC)) | |
370 | /* check for changed config, every 3 seconds at most */ | |
371 | return; | |
372 | manager->last_usec = now_usec; | |
373 | ||
374 | /* Reload SELinux label database, to make the child inherit the up-to-date database. */ | |
375 | mac_selinux_maybe_reload(); | |
376 | ||
377 | /* Nothing changed. It is not necessary to reload. */ | |
f9b3b990 | 378 | if (!udev_rules_should_reload(manager->rules) && !udev_builtin_should_reload()) |
e9d1fae3 YW |
379 | return; |
380 | ||
419ec631 YW |
381 | sd_notify(false, |
382 | "RELOADING=1\n" | |
383 | "STATUS=Flushing configuration..."); | |
76e62a4d | 384 | |
419ec631 | 385 | manager_kill_workers(manager, false); |
e9d1fae3 | 386 | |
419ec631 | 387 | udev_builtin_exit(); |
e9d1fae3 YW |
388 | udev_builtin_init(); |
389 | ||
390 | r = udev_rules_load(&rules, arg_resolve_name_timing); | |
391 | if (r < 0) | |
392 | log_warning_errno(r, "Failed to read udev rules, using the previously loaded rules, ignoring: %m"); | |
393 | else | |
394 | udev_rules_free_and_replace(manager->rules, rules); | |
693d371d | 395 | |
4bf4f50f | 396 | notify_ready(); |
419ec631 | 397 | } |
e237d8cb | 398 | |
419ec631 | 399 | static int on_kill_workers_event(sd_event_source *s, uint64_t usec, void *userdata) { |
99534007 | 400 | Manager *manager = ASSERT_PTR(userdata); |
e237d8cb | 401 | |
419ec631 YW |
402 | log_debug("Cleanup idle workers"); |
403 | manager_kill_workers(manager, false); | |
e237d8cb | 404 | |
419ec631 YW |
405 | return 1; |
406 | } | |
e237d8cb | 407 | |
a79cba33 | 408 | static void device_broadcast(sd_device_monitor *monitor, sd_device *dev, EventResult result) { |
c17ab900 YW |
409 | int r; |
410 | ||
411 | assert(dev); | |
412 | ||
413 | /* On exit, manager->monitor is already NULL. */ | |
414 | if (!monitor) | |
415 | return; | |
416 | ||
a79cba33 | 417 | if (result != EVENT_RESULT_SUCCESS) { |
6467bda5 YW |
418 | (void) device_add_property(dev, "UDEV_WORKER_FAILED", "1"); |
419 | ||
420 | switch (result) { | |
fb544617 YW |
421 | case EVENT_RESULT_NERRNO_MIN ... EVENT_RESULT_NERRNO_MAX: { |
422 | const char *str; | |
423 | ||
6467bda5 | 424 | (void) device_add_propertyf(dev, "UDEV_WORKER_ERRNO", "%i", -result); |
6467bda5 | 425 | |
fb544617 YW |
426 | str = errno_to_name(result); |
427 | if (str) | |
428 | (void) device_add_property(dev, "UDEV_WORKER_ERRNO_NAME", str); | |
429 | break; | |
430 | } | |
6467bda5 YW |
431 | case EVENT_RESULT_EXIT_STATUS_BASE ... EVENT_RESULT_EXIT_STATUS_MAX: |
432 | (void) device_add_propertyf(dev, "UDEV_WORKER_EXIT_STATUS", "%i", result - EVENT_RESULT_EXIT_STATUS_BASE); | |
433 | break; | |
434 | ||
435 | case EVENT_RESULT_TRY_AGAIN: | |
436 | assert_not_reached(); | |
437 | break; | |
438 | ||
fb544617 YW |
439 | case EVENT_RESULT_SIGNAL_BASE ... EVENT_RESULT_SIGNAL_MAX: { |
440 | const char *str; | |
441 | ||
6467bda5 | 442 | (void) device_add_propertyf(dev, "UDEV_WORKER_SIGNAL", "%i", result - EVENT_RESULT_SIGNAL_BASE); |
6467bda5 | 443 | |
fb544617 YW |
444 | str = signal_to_string(result - EVENT_RESULT_SIGNAL_BASE); |
445 | if (str) | |
446 | (void) device_add_property(dev, "UDEV_WORKER_SIGNAL_NAME", str); | |
447 | break; | |
448 | } | |
6467bda5 YW |
449 | default: |
450 | log_device_warning(dev, "Unknown event result \"%i\", ignoring.", result); | |
451 | } | |
452 | } | |
453 | ||
c17ab900 YW |
454 | r = device_monitor_send_device(monitor, NULL, dev); |
455 | if (r < 0) | |
456 | log_device_warning_errno(dev, r, | |
457 | "Failed to broadcast event to libudev listeners, ignoring: %m"); | |
458 | } | |
459 | ||
a79cba33 | 460 | static int worker_send_result(Manager *manager, EventResult result) { |
5d354e52 YW |
461 | assert(manager); |
462 | assert(manager->worker_watch[WRITE_END] >= 0); | |
9a73bd7c | 463 | |
5d354e52 | 464 | return loop_write(manager->worker_watch[WRITE_END], &result, sizeof(result), false); |
9a73bd7c TG |
465 | } |
466 | ||
78e278ad | 467 | static int device_get_whole_disk(sd_device *dev, sd_device **ret_device, const char **ret_devname) { |
b97897e3 YW |
468 | const char *val; |
469 | int r; | |
fee854ee | 470 | |
0bed242c | 471 | assert(dev); |
a1130022 LP |
472 | |
473 | if (device_for_action(dev, SD_DEVICE_REMOVE)) | |
7b7959fb | 474 | goto irrelevant; |
0bed242c | 475 | |
b97897e3 YW |
476 | r = sd_device_get_sysname(dev, &val); |
477 | if (r < 0) | |
478 | return log_device_debug_errno(dev, r, "Failed to get sysname: %m"); | |
479 | ||
a9e83209 YW |
480 | /* Exclude the following devices: |
481 | * For "dm-", see the comment added by e918a1b5a94f270186dca59156354acd2a596494. | |
482 | * For "md", see the commit message of 2e5b17d01347d3c3118be2b8ad63d20415dbb1f0, | |
483 | * but not sure the assumption is still valid even when partitions are created on the md | |
484 | * devices, surprisingly which seems to be possible, see PR #22973. | |
485 | * For "drbd", see the commit message of fee854ee8ccde0cd28e0f925dea18cce35f3993d. */ | |
49fe5c09 | 486 | if (STARTSWITH_SET(val, "dm-", "md", "drbd")) |
7b7959fb | 487 | goto irrelevant; |
0bed242c | 488 | |
8f71534e YW |
489 | r = block_device_get_whole_disk(dev, &dev); |
490 | if (IN_SET(r, | |
491 | -ENOTBLK, /* The device is not a block device. */ | |
492 | -ENODEV /* The whole disk device was not found, it may already be removed. */)) | |
493 | goto irrelevant; | |
494 | if (r < 0) | |
495 | return log_device_debug_errno(dev, r, "Failed to get whole disk device: %m"); | |
0bed242c | 496 | |
b97897e3 | 497 | r = sd_device_get_devname(dev, &val); |
b97897e3 YW |
498 | if (r < 0) |
499 | return log_device_debug_errno(dev, r, "Failed to get devname: %m"); | |
0bed242c | 500 | |
78e278ad YW |
501 | if (ret_device) |
502 | *ret_device = dev; | |
503 | if (ret_devname) | |
504 | *ret_devname = val; | |
7b7959fb YW |
505 | return 1; |
506 | ||
507 | irrelevant: | |
78e278ad YW |
508 | if (ret_device) |
509 | *ret_device = NULL; | |
510 | if (ret_devname) | |
511 | *ret_devname = NULL; | |
7b7959fb YW |
512 | return 0; |
513 | } | |
514 | ||
03a24ce7 | 515 | static int worker_lock_whole_disk(sd_device *dev, int *ret_fd) { |
254d1313 | 516 | _cleanup_close_ int fd = -EBADF; |
78e278ad | 517 | sd_device *dev_whole_disk; |
7b7959fb YW |
518 | const char *val; |
519 | int r; | |
520 | ||
521 | assert(dev); | |
522 | assert(ret_fd); | |
523 | ||
524 | /* Take a shared lock on the device node; this establishes a concept of device "ownership" to | |
525 | * serialize device access. External processes holding an exclusive lock will cause udev to skip the | |
526 | * event handling; in the case udev acquired the lock, the external process can block until udev has | |
527 | * finished its event handling. */ | |
528 | ||
78e278ad | 529 | r = device_get_whole_disk(dev, &dev_whole_disk, &val); |
7b7959fb YW |
530 | if (r < 0) |
531 | return r; | |
532 | if (r == 0) | |
533 | goto nolock; | |
534 | ||
32703bd1 | 535 | fd = sd_device_open(dev_whole_disk, O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_NOCTTY); |
b97897e3 | 536 | if (fd < 0) { |
78e278ad | 537 | bool ignore = ERRNO_IS_DEVICE_ABSENT(fd); |
ef400c38 | 538 | |
78e278ad | 539 | log_device_debug_errno(dev, fd, "Failed to open '%s'%s: %m", val, ignore ? ", ignoring" : ""); |
7b7959fb | 540 | if (!ignore) |
78e278ad | 541 | return fd; |
7b7959fb YW |
542 | |
543 | goto nolock; | |
b97897e3 | 544 | } |
0bed242c YW |
545 | |
546 | if (flock(fd, LOCK_SH|LOCK_NB) < 0) | |
b97897e3 | 547 | return log_device_debug_errno(dev, errno, "Failed to flock(%s): %m", val); |
0bed242c YW |
548 | |
549 | *ret_fd = TAKE_FD(fd); | |
550 | return 1; | |
7b7959fb YW |
551 | |
552 | nolock: | |
254d1313 | 553 | *ret_fd = -EBADF; |
7b7959fb | 554 | return 0; |
fee854ee RK |
555 | } |
556 | ||
95ac5230 | 557 | static int worker_mark_block_device_read_only(sd_device *dev) { |
254d1313 | 558 | _cleanup_close_ int fd = -EBADF; |
95ac5230 LP |
559 | const char *val; |
560 | int state = 1, r; | |
561 | ||
562 | assert(dev); | |
563 | ||
564 | if (!arg_blockdev_read_only) | |
565 | return 0; | |
566 | ||
567 | /* Do this only once, when the block device is new. If the device is later retriggered let's not | |
568 | * toggle the bit again, so that people can boot up with full read-only mode and then unset the bit | |
569 | * for specific devices only. */ | |
a1130022 | 570 | if (!device_for_action(dev, SD_DEVICE_ADD)) |
95ac5230 LP |
571 | return 0; |
572 | ||
573 | r = sd_device_get_subsystem(dev, &val); | |
574 | if (r < 0) | |
575 | return log_device_debug_errno(dev, r, "Failed to get subsystem: %m"); | |
576 | ||
577 | if (!streq(val, "block")) | |
578 | return 0; | |
579 | ||
580 | r = sd_device_get_sysname(dev, &val); | |
581 | if (r < 0) | |
582 | return log_device_debug_errno(dev, r, "Failed to get sysname: %m"); | |
583 | ||
584 | /* Exclude synthetic devices for now, this is supposed to be a safety feature to avoid modification | |
585 | * of physical devices, and what sits on top of those doesn't really matter if we don't allow the | |
cb713f16 | 586 | * underlying block devices to receive changes. */ |
95ac5230 LP |
587 | if (STARTSWITH_SET(val, "dm-", "md", "drbd", "loop", "nbd", "zram")) |
588 | return 0; | |
589 | ||
32703bd1 | 590 | fd = sd_device_open(dev, O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_NOCTTY); |
95ac5230 | 591 | if (fd < 0) |
78e278ad | 592 | return log_device_debug_errno(dev, fd, "Failed to open '%s', ignoring: %m", val); |
95ac5230 LP |
593 | |
594 | if (ioctl(fd, BLKROSET, &state) < 0) | |
595 | return log_device_warning_errno(dev, errno, "Failed to mark block device '%s' read-only: %m", val); | |
596 | ||
597 | log_device_info(dev, "Successfully marked block device '%s' read-only.", val); | |
598 | return 0; | |
599 | } | |
600 | ||
abde5ea8 | 601 | static int worker_process_device(Manager *manager, sd_device *dev) { |
2e088715 | 602 | _cleanup_(udev_event_freep) UdevEvent *udev_event = NULL; |
254d1313 | 603 | _cleanup_close_ int fd_lock = -EBADF; |
0bed242c | 604 | int r; |
912541b0 | 605 | |
0bed242c YW |
606 | assert(manager); |
607 | assert(dev); | |
608 | ||
b2d9e58f | 609 | log_device_uevent(dev, "Processing device"); |
abde5ea8 | 610 | |
1a0bd015 | 611 | udev_event = udev_event_new(dev, arg_exec_delay_usec, manager->rtnl, manager->log_level); |
0bed242c YW |
612 | if (!udev_event) |
613 | return -ENOMEM; | |
614 | ||
5d354e52 YW |
615 | /* If this is a block device and the device is locked currently via the BSD advisory locks, |
616 | * someone else is using it exclusively. We don't run our udev rules now to not interfere. | |
617 | * Instead of processing the event, we requeue the event and will try again after a delay. | |
618 | * | |
619 | * The user-facing side of this: https://systemd.io/BLOCK_DEVICE_LOCKING */ | |
03a24ce7 | 620 | r = worker_lock_whole_disk(dev, &fd_lock); |
6467bda5 YW |
621 | if (r == -EAGAIN) |
622 | return EVENT_RESULT_TRY_AGAIN; | |
b6aab8ef | 623 | if (r < 0) |
0bed242c | 624 | return r; |
912541b0 | 625 | |
95ac5230 LP |
626 | (void) worker_mark_block_device_read_only(dev); |
627 | ||
0bed242c | 628 | /* apply rules, create node, symlinks */ |
df7ee959 YW |
629 | r = udev_event_execute_rules( |
630 | udev_event, | |
631 | manager->inotify_fd, | |
632 | arg_event_timeout_usec, | |
633 | arg_timeout_signal, | |
634 | manager->properties, | |
635 | manager->rules); | |
99058cd6 YW |
636 | if (r < 0) |
637 | return r; | |
638 | ||
e2099267 | 639 | udev_event_execute_run(udev_event, arg_event_timeout_usec, arg_timeout_signal); |
2dd9f98d | 640 | |
0bed242c YW |
641 | if (!manager->rtnl) |
642 | /* in case rtnl was initialized */ | |
643 | manager->rtnl = sd_netlink_ref(udev_event->rtnl); | |
912541b0 | 644 | |
04b25410 YW |
645 | if (udev_event->inotify_watch) { |
646 | r = udev_watch_begin(manager->inotify_fd, dev); | |
647 | if (r < 0 && r != -ENOENT) /* The device may be already removed, ignore -ENOENT. */ | |
648 | log_device_warning_errno(dev, r, "Failed to add inotify watch, ignoring: %m"); | |
649 | } | |
912541b0 | 650 | |
b2d9e58f | 651 | log_device_uevent(dev, "Device processed"); |
0bed242c YW |
652 | return 0; |
653 | } | |
912541b0 | 654 | |
e2130348 | 655 | static int worker_device_monitor_handler(sd_device_monitor *monitor, sd_device *dev, void *userdata) { |
99534007 | 656 | Manager *manager = ASSERT_PTR(userdata); |
e2130348 YW |
657 | int r; |
658 | ||
659 | assert(dev); | |
e2130348 YW |
660 | |
661 | r = worker_process_device(manager, dev); | |
6467bda5 | 662 | if (r == EVENT_RESULT_TRY_AGAIN) |
5d354e52 | 663 | /* if we couldn't acquire the flock(), then requeue the event */ |
6467bda5 YW |
664 | log_device_debug(dev, "Block device is currently locked, requeueing the event."); |
665 | else { | |
666 | if (r < 0) | |
667 | log_device_warning_errno(dev, r, "Failed to process device, ignoring: %m"); | |
e2130348 | 668 | |
5abee64e | 669 | /* send processed event back to libudev listeners */ |
6467bda5 YW |
670 | device_broadcast(monitor, dev, r); |
671 | } | |
e2130348 YW |
672 | |
673 | /* send udevd the result of the event execution */ | |
6467bda5 | 674 | r = worker_send_result(manager, r); |
e2130348 YW |
675 | if (r < 0) |
676 | log_device_warning_errno(dev, r, "Failed to send signal to main daemon, ignoring: %m"); | |
677 | ||
1a0bd015 | 678 | /* Reset the log level, as it might be changed by "OPTIONS=log_level=". */ |
3cc6b14a | 679 | log_set_max_level(manager->log_level); |
1a0bd015 | 680 | |
e2130348 YW |
681 | return 1; |
682 | } | |
683 | ||
7f2e3a14 YW |
684 | static int worker_main(Manager *_manager, sd_device_monitor *monitor, sd_device *first_device) { |
685 | _cleanup_(sd_device_unrefp) sd_device *dev = first_device; | |
0bed242c | 686 | _cleanup_(manager_freep) Manager *manager = _manager; |
44dcf454 | 687 | int r; |
145dae7e | 688 | |
0bed242c YW |
689 | assert(manager); |
690 | assert(monitor); | |
691 | assert(dev); | |
912541b0 | 692 | |
44ee03d1 | 693 | assert_se(unsetenv("NOTIFY_SOCKET") == 0); |
3b64e4d4 | 694 | |
e2130348 YW |
695 | assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, -1) >= 0); |
696 | ||
697 | /* Reset OOM score, we only protect the main daemon. */ | |
698 | r = set_oom_score_adjust(0); | |
699 | if (r < 0) | |
700 | log_debug_errno(r, "Failed to reset OOM score, ignoring: %m"); | |
912541b0 | 701 | |
7802194a | 702 | /* Clear unnecessary data in Manager object. */ |
e2130348 | 703 | manager_clear_for_worker(manager); |
3ebdb81e | 704 | |
e2130348 YW |
705 | r = sd_event_new(&manager->event); |
706 | if (r < 0) | |
707 | return log_error_errno(r, "Failed to allocate event loop: %m"); | |
912541b0 | 708 | |
e2130348 YW |
709 | r = sd_event_add_signal(manager->event, NULL, SIGTERM, NULL, NULL); |
710 | if (r < 0) | |
711 | return log_error_errno(r, "Failed to set SIGTERM event: %m"); | |
4c83d994 | 712 | |
e2130348 YW |
713 | r = sd_device_monitor_attach_event(monitor, manager->event); |
714 | if (r < 0) | |
715 | return log_error_errno(r, "Failed to attach event loop to device monitor: %m"); | |
912541b0 | 716 | |
e2130348 | 717 | r = sd_device_monitor_start(monitor, worker_device_monitor_handler, manager); |
0bed242c | 718 | if (r < 0) |
e2130348 | 719 | return log_error_errno(r, "Failed to start device monitor: %m"); |
912541b0 | 720 | |
e2130348 YW |
721 | /* Process first device */ |
722 | (void) worker_device_monitor_handler(monitor, dev, manager); | |
912541b0 | 723 | |
e2130348 YW |
724 | r = sd_event_loop(manager->event); |
725 | if (r < 0) | |
726 | return log_error_errno(r, "Event loop failed: %m"); | |
727 | ||
44dcf454 | 728 | return 0; |
0bed242c YW |
729 | } |
730 | ||
419ec631 | 731 | static int on_event_timeout(sd_event_source *s, uint64_t usec, void *userdata) { |
99534007 | 732 | Event *event = ASSERT_PTR(userdata); |
419ec631 | 733 | |
419ec631 YW |
734 | assert(event->worker); |
735 | ||
736 | kill_and_sigcont(event->worker->pid, arg_timeout_signal); | |
737 | event->worker->state = WORKER_KILLED; | |
738 | ||
739 | log_device_error(event->dev, "Worker ["PID_FMT"] processing SEQNUM=%"PRIu64" killed", event->worker->pid, event->seqnum); | |
740 | ||
741 | return 1; | |
742 | } | |
743 | ||
744 | static int on_event_timeout_warning(sd_event_source *s, uint64_t usec, void *userdata) { | |
99534007 | 745 | Event *event = ASSERT_PTR(userdata); |
419ec631 | 746 | |
419ec631 YW |
747 | assert(event->worker); |
748 | ||
749 | log_device_warning(event->dev, "Worker ["PID_FMT"] processing SEQNUM=%"PRIu64" is taking a long time", event->worker->pid, event->seqnum); | |
750 | ||
751 | return 1; | |
752 | } | |
753 | ||
754 | static void worker_attach_event(Worker *worker, Event *event) { | |
755 | sd_event *e; | |
756 | ||
757 | assert(worker); | |
758 | assert(worker->manager); | |
759 | assert(event); | |
760 | assert(!event->worker); | |
761 | assert(!worker->event); | |
762 | ||
763 | worker->state = WORKER_RUNNING; | |
764 | worker->event = event; | |
765 | event->state = EVENT_RUNNING; | |
766 | event->worker = worker; | |
767 | ||
768 | e = worker->manager->event; | |
769 | ||
770 | (void) sd_event_add_time_relative(e, &event->timeout_warning_event, CLOCK_MONOTONIC, | |
771 | udev_warn_timeout(arg_event_timeout_usec), USEC_PER_SEC, | |
772 | on_event_timeout_warning, event); | |
773 | ||
774 | (void) sd_event_add_time_relative(e, &event->timeout_event, CLOCK_MONOTONIC, | |
775 | arg_event_timeout_usec, USEC_PER_SEC, | |
776 | on_event_timeout, event); | |
777 | } | |
778 | ||
d9239923 | 779 | static int worker_spawn(Manager *manager, Event *event) { |
7f2e3a14 | 780 | _cleanup_(sd_device_monitor_unrefp) sd_device_monitor *worker_monitor = NULL; |
d9239923 | 781 | Worker *worker; |
0bed242c | 782 | pid_t pid; |
7443654e | 783 | int r; |
0bed242c YW |
784 | |
785 | /* listen for new events */ | |
7f2e3a14 YW |
786 | r = device_monitor_new_full(&worker_monitor, MONITOR_GROUP_NONE, -1); |
787 | if (r < 0) | |
788 | return r; | |
7443654e | 789 | |
f714ecd4 YW |
790 | (void) sd_device_monitor_set_description(worker_monitor, "worker"); |
791 | ||
0bed242c | 792 | /* allow the main daemon netlink address to send devices to the worker */ |
7f2e3a14 YW |
793 | r = device_monitor_allow_unicast_sender(worker_monitor, manager->monitor); |
794 | if (r < 0) | |
795 | return log_error_errno(r, "Worker: Failed to set unicast sender: %m"); | |
796 | ||
797 | r = device_monitor_enable_receiving(worker_monitor); | |
0bed242c | 798 | if (r < 0) |
7f2e3a14 | 799 | return log_error_errno(r, "Worker: Failed to enable receiving of device: %m"); |
0bed242c | 800 | |
ff86c92e | 801 | r = safe_fork(NULL, FORK_DEATHSIG, &pid); |
7443654e YW |
802 | if (r < 0) { |
803 | event->state = EVENT_QUEUED; | |
804 | return log_error_errno(r, "Failed to fork() worker: %m"); | |
805 | } | |
806 | if (r == 0) { | |
b428efa5 MS |
807 | DEVICE_TRACE_POINT(worker_spawned, event->dev, getpid()); |
808 | ||
7443654e | 809 | /* Worker process */ |
eb546b35 | 810 | r = worker_main(manager, worker_monitor, sd_device_ref(event->dev)); |
baa30fbc | 811 | log_close(); |
8b46c3fc | 812 | _exit(r < 0 ? EXIT_FAILURE : EXIT_SUCCESS); |
912541b0 | 813 | } |
e03c7cc2 | 814 | |
7443654e YW |
815 | r = worker_new(&worker, manager, worker_monitor, pid); |
816 | if (r < 0) | |
817 | return log_error_errno(r, "Failed to create worker object: %m"); | |
e03c7cc2 | 818 | |
7443654e | 819 | worker_attach_event(worker, event); |
39c19cf1 | 820 | |
eb546b35 | 821 | log_device_debug(event->dev, "Worker ["PID_FMT"] is forked for processing SEQNUM=%"PRIu64".", pid, event->seqnum); |
7443654e | 822 | return 0; |
7fafc032 KS |
823 | } |
824 | ||
f2a5412b | 825 | static int event_run(Event *event) { |
5406c368 | 826 | static bool log_children_max_reached = true; |
f2a5412b | 827 | Manager *manager; |
d9239923 | 828 | Worker *worker; |
7f2e3a14 | 829 | int r; |
912541b0 | 830 | |
c0c6806b | 831 | assert(event); |
f2a5412b | 832 | assert(event->manager); |
c0c6806b | 833 | |
b2d9e58f | 834 | log_device_uevent(event->dev, "Device ready for processing"); |
7600dbb8 | 835 | |
4f294ffd YW |
836 | (void) event_source_disable(event->retry_event_source); |
837 | ||
f2a5412b | 838 | manager = event->manager; |
90e74a66 | 839 | HASHMAP_FOREACH(worker, manager->workers) { |
912541b0 KS |
840 | if (worker->state != WORKER_IDLE) |
841 | continue; | |
842 | ||
eb546b35 | 843 | r = device_monitor_send_device(manager->monitor, worker->monitor, event->dev); |
7f2e3a14 | 844 | if (r < 0) { |
eb546b35 | 845 | log_device_error_errno(event->dev, r, "Worker ["PID_FMT"] did not accept message, killing the worker: %m", |
7f2e3a14 | 846 | worker->pid); |
cb542e84 | 847 | (void) kill(worker->pid, SIGKILL); |
912541b0 KS |
848 | worker->state = WORKER_KILLED; |
849 | continue; | |
850 | } | |
39c19cf1 | 851 | worker_attach_event(worker, event); |
f2a5412b | 852 | return 1; /* event is now processing. */ |
912541b0 KS |
853 | } |
854 | ||
c0c6806b | 855 | if (hashmap_size(manager->workers) >= arg_children_max) { |
5406c368 FB |
856 | /* Avoid spamming the debug logs if the limit is already reached and |
857 | * many events still need to be processed */ | |
858 | if (log_children_max_reached && arg_children_max > 1) { | |
044497e2 | 859 | log_debug("Maximum number (%u) of children reached.", hashmap_size(manager->workers)); |
5406c368 FB |
860 | log_children_max_reached = false; |
861 | } | |
f2a5412b | 862 | return 0; /* no free worker */ |
912541b0 KS |
863 | } |
864 | ||
5406c368 FB |
865 | /* Re-enable the debug message for the next batch of events */ |
866 | log_children_max_reached = true; | |
867 | ||
912541b0 | 868 | /* start new worker and pass initial device */ |
f2a5412b YW |
869 | r = worker_spawn(manager, event); |
870 | if (r < 0) | |
871 | return r; | |
872 | ||
873 | return 1; /* event is now processing. */ | |
1e03b754 KS |
874 | } |
875 | ||
a1fa99d8 | 876 | static int event_is_blocked(Event *event) { |
03677889 | 877 | Event *loop_event = NULL; |
29d02458 | 878 | int r; |
eb546b35 | 879 | |
a1fa99d8 YW |
880 | /* lookup event for identical, parent, child device */ |
881 | ||
044ac33c YW |
882 | assert(event); |
883 | assert(event->manager); | |
884 | assert(event->blocker_seqnum <= event->seqnum); | |
885 | ||
5d354e52 YW |
886 | if (event->retry_again_next_usec > 0) { |
887 | usec_t now_usec; | |
888 | ||
ba4e0427 | 889 | r = sd_event_now(event->manager->event, CLOCK_BOOTTIME, &now_usec); |
5d354e52 YW |
890 | if (r < 0) |
891 | return r; | |
892 | ||
400e3d21 | 893 | if (event->retry_again_next_usec > now_usec) |
5d354e52 YW |
894 | return true; |
895 | } | |
896 | ||
044ac33c YW |
897 | if (event->blocker_seqnum == event->seqnum) |
898 | /* we have checked previously and no blocker found */ | |
899 | return false; | |
900 | ||
03677889 YW |
901 | LIST_FOREACH(event, e, event->manager->events) { |
902 | loop_event = e; | |
903 | ||
044ac33c YW |
904 | /* we already found a later event, earlier cannot block us, no need to check again */ |
905 | if (loop_event->seqnum < event->blocker_seqnum) | |
906 | continue; | |
907 | ||
908 | /* event we checked earlier still exists, no need to check again */ | |
909 | if (loop_event->seqnum == event->blocker_seqnum) | |
910 | return true; | |
911 | ||
912 | /* found ourself, no later event can block us */ | |
913 | if (loop_event->seqnum >= event->seqnum) | |
914 | goto no_blocker; | |
915 | ||
916 | /* found event we have not checked */ | |
917 | break; | |
918 | } | |
919 | ||
920 | assert(loop_event); | |
921 | assert(loop_event->seqnum > event->blocker_seqnum && | |
922 | loop_event->seqnum < event->seqnum); | |
923 | ||
912541b0 | 924 | /* check if queue contains events we depend on */ |
03677889 | 925 | LIST_FOREACH(event, e, loop_event) { |
03677889 YW |
926 | loop_event = e; |
927 | ||
912541b0 KS |
928 | /* found ourself, no later event can block us */ |
929 | if (loop_event->seqnum >= event->seqnum) | |
044ac33c | 930 | goto no_blocker; |
912541b0 | 931 | |
29d02458 | 932 | if (streq_ptr(loop_event->id, event->id)) |
a1fa99d8 | 933 | break; |
912541b0 | 934 | |
a1af9668 YW |
935 | if (devpath_conflict(event->devpath, loop_event->devpath) || |
936 | devpath_conflict(event->devpath, loop_event->devpath_old) || | |
937 | devpath_conflict(event->devpath_old, loop_event->devpath)) | |
a1fa99d8 | 938 | break; |
912541b0 | 939 | |
34458dbb | 940 | if (event->devnode && streq_ptr(event->devnode, loop_event->devnode)) |
a1fa99d8 | 941 | break; |
912541b0 KS |
942 | } |
943 | ||
a1fa99d8 | 944 | assert(loop_event); |
0bd0407e | 945 | |
7600dbb8 UKK |
946 | log_device_debug(event->dev, "SEQNUM=%" PRIu64 " blocked by SEQNUM=%" PRIu64, |
947 | event->seqnum, loop_event->seqnum); | |
948 | ||
a1fa99d8 | 949 | event->blocker_seqnum = loop_event->seqnum; |
0bd0407e | 950 | return true; |
044ac33c YW |
951 | |
952 | no_blocker: | |
953 | event->blocker_seqnum = event->seqnum; | |
954 | return false; | |
7fafc032 KS |
955 | } |
956 | ||
0744e74c | 957 | static int event_queue_start(Manager *manager) { |
0725c4b9 | 958 | int r; |
8ab44e3f | 959 | |
c0c6806b TG |
960 | assert(manager); |
961 | ||
64903d18 | 962 | if (!manager->events || manager->exit || manager->stop_exec_queue) |
0744e74c | 963 | return 0; |
7c4c7e89 | 964 | |
10551728 YW |
965 | /* To make the stack directory /run/udev/links cleaned up later. */ |
966 | manager->udev_node_needs_cleanup = true; | |
967 | ||
0725c4b9 YW |
968 | r = event_source_disable(manager->kill_workers_event); |
969 | if (r < 0) | |
970 | log_warning_errno(r, "Failed to disable event source for cleaning up idle workers, ignoring: %m"); | |
eca195ec | 971 | |
e9d1fae3 | 972 | manager_reload(manager, /* force = */ false); |
c02fb804 | 973 | |
80a226b2 | 974 | LIST_FOREACH(event, event, manager->events) { |
912541b0 KS |
975 | if (event->state != EVENT_QUEUED) |
976 | continue; | |
0bc74ea7 | 977 | |
c6f78234 YW |
978 | /* do not start event if parent or child event is still running or queued */ |
979 | r = event_is_blocked(event); | |
2d40f02e YW |
980 | if (r > 0) |
981 | continue; | |
0c3d8182 | 982 | if (r < 0) |
c6f78234 | 983 | log_device_warning_errno(event->dev, r, |
2d40f02e YW |
984 | "Failed to check dependencies for event (SEQNUM=%"PRIu64", ACTION=%s), " |
985 | "assuming there is no blocking event, ignoring: %m", | |
c6f78234 | 986 | event->seqnum, |
0c3d8182 | 987 | strna(device_action_to_string(event->action))); |
fc465079 | 988 | |
f2a5412b | 989 | r = event_run(event); |
2d40f02e | 990 | if (r <= 0) /* 0 means there are no idle workers. Let's escape from the loop. */ |
f2a5412b | 991 | return r; |
912541b0 | 992 | } |
0744e74c YW |
993 | |
994 | return 0; | |
1e03b754 KS |
995 | } |
996 | ||
4f294ffd YW |
997 | static int on_event_retry(sd_event_source *s, uint64_t usec, void *userdata) { |
998 | /* This does nothing. The on_post() callback will start the event if there exists an idle worker. */ | |
999 | return 1; | |
1000 | } | |
1001 | ||
5d354e52 YW |
1002 | static int event_requeue(Event *event) { |
1003 | usec_t now_usec; | |
1004 | int r; | |
1005 | ||
1006 | assert(event); | |
1007 | assert(event->manager); | |
1008 | assert(event->manager->event); | |
1009 | ||
1010 | event->timeout_warning_event = sd_event_source_disable_unref(event->timeout_warning_event); | |
1011 | event->timeout_event = sd_event_source_disable_unref(event->timeout_event); | |
1012 | ||
1013 | /* add a short delay to suppress busy loop */ | |
ba4e0427 | 1014 | r = sd_event_now(event->manager->event, CLOCK_BOOTTIME, &now_usec); |
5d354e52 YW |
1015 | if (r < 0) |
1016 | return log_device_warning_errno(event->dev, r, | |
1017 | "Failed to get current time, " | |
1018 | "skipping event (SEQNUM=%"PRIu64", ACTION=%s): %m", | |
1019 | event->seqnum, strna(device_action_to_string(event->action))); | |
1020 | ||
1021 | if (event->retry_again_timeout_usec > 0 && event->retry_again_timeout_usec <= now_usec) | |
1022 | return log_device_warning_errno(event->dev, SYNTHETIC_ERRNO(ETIMEDOUT), | |
1023 | "The underlying block device is locked by a process more than %s, " | |
1024 | "skipping event (SEQNUM=%"PRIu64", ACTION=%s).", | |
1025 | FORMAT_TIMESPAN(EVENT_RETRY_TIMEOUT_USEC, USEC_PER_MINUTE), | |
1026 | event->seqnum, strna(device_action_to_string(event->action))); | |
1027 | ||
1028 | event->retry_again_next_usec = usec_add(now_usec, EVENT_RETRY_INTERVAL_USEC); | |
1029 | if (event->retry_again_timeout_usec == 0) | |
1030 | event->retry_again_timeout_usec = usec_add(now_usec, EVENT_RETRY_TIMEOUT_USEC); | |
1031 | ||
4f294ffd YW |
1032 | r = event_reset_time_relative(event->manager->event, &event->retry_event_source, |
1033 | CLOCK_MONOTONIC, EVENT_RETRY_INTERVAL_USEC, 0, | |
1034 | on_event_retry, NULL, | |
1035 | 0, "retry-event", true); | |
1036 | if (r < 0) | |
1037 | return log_device_warning_errno(event->dev, r, "Failed to reset timer event source for retrying event, " | |
1038 | "skipping event (SEQNUM=%"PRIu64", ACTION=%s): %m", | |
1039 | event->seqnum, strna(device_action_to_string(event->action))); | |
1040 | ||
5d354e52 YW |
1041 | if (event->worker && event->worker->event == event) |
1042 | event->worker->event = NULL; | |
1043 | event->worker = NULL; | |
1044 | ||
1045 | event->state = EVENT_QUEUED; | |
1046 | return 0; | |
1047 | } | |
1048 | ||
82a5de9f YW |
1049 | static int event_queue_assume_block_device_unlocked(Manager *manager, sd_device *dev) { |
1050 | const char *devname; | |
1051 | int r; | |
1052 | ||
1053 | /* When a new event for a block device is queued or we get an inotify event, assume that the | |
1054 | * device is not locked anymore. The assumption may not be true, but that should not cause any | |
1055 | * issues, as in that case events will be requeued soon. */ | |
1056 | ||
78e278ad | 1057 | r = device_get_whole_disk(dev, NULL, &devname); |
82a5de9f YW |
1058 | if (r <= 0) |
1059 | return r; | |
1060 | ||
1061 | LIST_FOREACH(event, event, manager->events) { | |
1062 | const char *event_devname; | |
1063 | ||
1064 | if (event->state != EVENT_QUEUED) | |
1065 | continue; | |
1066 | ||
1067 | if (event->retry_again_next_usec == 0) | |
1068 | continue; | |
1069 | ||
78e278ad | 1070 | if (device_get_whole_disk(event->dev, NULL, &event_devname) <= 0) |
82a5de9f YW |
1071 | continue; |
1072 | ||
1073 | if (!streq(devname, event_devname)) | |
1074 | continue; | |
1075 | ||
1076 | event->retry_again_next_usec = 0; | |
1077 | } | |
1078 | ||
1079 | return 0; | |
1080 | } | |
1081 | ||
419ec631 | 1082 | static int event_queue_insert(Manager *manager, sd_device *dev) { |
34458dbb | 1083 | const char *devpath, *devpath_old = NULL, *id = NULL, *devnode = NULL; |
0c3d8182 | 1084 | sd_device_action_t action; |
419ec631 | 1085 | uint64_t seqnum; |
c9473aaa | 1086 | Event *event; |
419ec631 | 1087 | int r; |
ff2c503d | 1088 | |
419ec631 YW |
1089 | assert(manager); |
1090 | assert(dev); | |
ff2c503d | 1091 | |
419ec631 YW |
1092 | /* only one process can add events to the queue */ |
1093 | assert(manager->pid == getpid_cached()); | |
1094 | ||
1095 | /* We only accepts devices received by device monitor. */ | |
1096 | r = sd_device_get_seqnum(dev, &seqnum); | |
1097 | if (r < 0) | |
1098 | return r; | |
1099 | ||
0c3d8182 YW |
1100 | r = sd_device_get_action(dev, &action); |
1101 | if (r < 0) | |
1102 | return r; | |
1103 | ||
29d02458 YW |
1104 | r = sd_device_get_devpath(dev, &devpath); |
1105 | if (r < 0) | |
1106 | return r; | |
1107 | ||
1108 | r = sd_device_get_property_value(dev, "DEVPATH_OLD", &devpath_old); | |
1109 | if (r < 0 && r != -ENOENT) | |
1110 | return r; | |
1111 | ||
1112 | r = device_get_device_id(dev, &id); | |
1113 | if (r < 0 && r != -ENOENT) | |
1114 | return r; | |
1115 | ||
34458dbb YW |
1116 | r = sd_device_get_devname(dev, &devnode); |
1117 | if (r < 0 && r != -ENOENT) | |
1118 | return r; | |
1119 | ||
419ec631 YW |
1120 | event = new(Event, 1); |
1121 | if (!event) | |
1122 | return -ENOMEM; | |
1123 | ||
1124 | *event = (Event) { | |
1125 | .manager = manager, | |
1126 | .dev = sd_device_ref(dev), | |
419ec631 | 1127 | .seqnum = seqnum, |
0c3d8182 | 1128 | .action = action, |
29d02458 YW |
1129 | .id = id, |
1130 | .devpath = devpath, | |
1131 | .devpath_old = devpath_old, | |
34458dbb | 1132 | .devnode = devnode, |
419ec631 YW |
1133 | .state = EVENT_QUEUED, |
1134 | }; | |
1135 | ||
64903d18 | 1136 | if (!manager->events) { |
419ec631 YW |
1137 | r = touch("/run/udev/queue"); |
1138 | if (r < 0) | |
6be97d67 | 1139 | log_warning_errno(r, "Failed to touch /run/udev/queue, ignoring: %m"); |
912541b0 | 1140 | } |
419ec631 YW |
1141 | |
1142 | LIST_APPEND(event, manager->events, event); | |
1143 | ||
1144 | log_device_uevent(dev, "Device is queued"); | |
1145 | ||
1146 | return 0; | |
1147 | } | |
1148 | ||
1149 | static int on_uevent(sd_device_monitor *monitor, sd_device *dev, void *userdata) { | |
99534007 | 1150 | Manager *manager = ASSERT_PTR(userdata); |
419ec631 YW |
1151 | int r; |
1152 | ||
419ec631 YW |
1153 | DEVICE_TRACE_POINT(kernel_uevent_received, dev); |
1154 | ||
1155 | device_ensure_usec_initialized(dev, NULL); | |
1156 | ||
1157 | r = event_queue_insert(manager, dev); | |
1158 | if (r < 0) { | |
1159 | log_device_error_errno(dev, r, "Failed to insert device into event queue: %m"); | |
1160 | return 1; | |
1161 | } | |
1162 | ||
82a5de9f YW |
1163 | (void) event_queue_assume_block_device_unlocked(manager, dev); |
1164 | ||
419ec631 | 1165 | return 1; |
ff2c503d KS |
1166 | } |
1167 | ||
e82e8fa5 | 1168 | static int on_worker(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
99534007 | 1169 | Manager *manager = ASSERT_PTR(userdata); |
c0c6806b | 1170 | |
912541b0 | 1171 | for (;;) { |
a79cba33 | 1172 | EventResult result; |
5d354e52 | 1173 | struct iovec iovec = IOVEC_MAKE(&result, sizeof(result)); |
fb29cdbe | 1174 | CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(struct ucred))) control; |
979558f3 TG |
1175 | struct msghdr msghdr = { |
1176 | .msg_iov = &iovec, | |
1177 | .msg_iovlen = 1, | |
1178 | .msg_control = &control, | |
1179 | .msg_controllen = sizeof(control), | |
1180 | }; | |
912541b0 | 1181 | ssize_t size; |
371d72e0 | 1182 | struct ucred *ucred; |
d9239923 | 1183 | Worker *worker; |
912541b0 | 1184 | |
3691bcf3 LP |
1185 | size = recvmsg_safe(fd, &msghdr, MSG_DONTWAIT); |
1186 | if (size == -EINTR) | |
1187 | continue; | |
1188 | if (size == -EAGAIN) | |
1189 | /* nothing more to read */ | |
1190 | break; | |
1191 | if (size < 0) | |
1192 | return log_error_errno(size, "Failed to receive message: %m"); | |
1193 | ||
1194 | cmsg_close_all(&msghdr); | |
979558f3 | 1195 | |
6467bda5 | 1196 | if (size != sizeof(result)) { |
d4e98880 | 1197 | log_warning("Ignoring worker message with invalid size %zi bytes", size); |
e82e8fa5 | 1198 | continue; |
979558f3 TG |
1199 | } |
1200 | ||
371d72e0 | 1201 | ucred = CMSG_FIND_DATA(&msghdr, SOL_SOCKET, SCM_CREDENTIALS, struct ucred); |
979558f3 | 1202 | if (!ucred || ucred->pid <= 0) { |
d4e98880 | 1203 | log_warning("Ignoring worker message without valid PID"); |
979558f3 TG |
1204 | continue; |
1205 | } | |
912541b0 KS |
1206 | |
1207 | /* lookup worker who sent the signal */ | |
4a0b58c4 | 1208 | worker = hashmap_get(manager->workers, PID_TO_PTR(ucred->pid)); |
a505965d | 1209 | if (!worker) { |
044497e2 | 1210 | log_debug("Worker ["PID_FMT"] returned, but is no longer tracked", ucred->pid); |
a505965d | 1211 | continue; |
912541b0 | 1212 | } |
c0bbfd72 | 1213 | |
f257a8fc YG |
1214 | if (worker->state == WORKER_KILLING) { |
1215 | worker->state = WORKER_KILLED; | |
1216 | (void) kill(worker->pid, SIGTERM); | |
1217 | } else if (worker->state != WORKER_KILLED) | |
a505965d TG |
1218 | worker->state = WORKER_IDLE; |
1219 | ||
1220 | /* worker returned */ | |
5d354e52 YW |
1221 | if (result == EVENT_RESULT_TRY_AGAIN && |
1222 | event_requeue(worker->event) < 0) | |
6467bda5 | 1223 | device_broadcast(manager->monitor, worker->event->dev, -ETIMEDOUT); |
5d354e52 YW |
1224 | |
1225 | /* When event_requeue() succeeds, worker->event is NULL, and event_free() handles NULL gracefully. */ | |
a505965d | 1226 | event_free(worker->event); |
912541b0 | 1227 | } |
e82e8fa5 TG |
1228 | |
1229 | return 1; | |
1230 | } | |
1231 | ||
3b47c739 | 1232 | /* receive the udevd message from userspace */ |
e0d61dac | 1233 | static int on_ctrl_msg(UdevCtrl *uctrl, UdevCtrlMessageType type, const UdevCtrlMessageValue *value, void *userdata) { |
99534007 | 1234 | Manager *manager = ASSERT_PTR(userdata); |
d02c6f54 | 1235 | int r; |
912541b0 | 1236 | |
d02c6f54 | 1237 | assert(value); |
e4f66b77 | 1238 | |
d02c6f54 YW |
1239 | switch (type) { |
1240 | case UDEV_CTRL_SET_LOG_LEVEL: | |
53c8590f YW |
1241 | if ((value->intval & LOG_PRIMASK) != value->intval) { |
1242 | log_debug("Received invalid udev control message (SET_LOG_LEVEL, %i), ignoring.", value->intval); | |
1243 | break; | |
1244 | } | |
1245 | ||
64a3494c | 1246 | log_debug("Received udev control message (SET_LOG_LEVEL), setting log_level=%i", value->intval); |
53c8590f YW |
1247 | |
1248 | r = log_get_max_level(); | |
1249 | if (r == value->intval) | |
1250 | break; | |
1251 | ||
3cc6b14a | 1252 | log_set_max_level(value->intval); |
1a0bd015 | 1253 | manager->log_level = value->intval; |
f257a8fc | 1254 | manager_kill_workers(manager, false); |
d02c6f54 YW |
1255 | break; |
1256 | case UDEV_CTRL_STOP_EXEC_QUEUE: | |
044497e2 | 1257 | log_debug("Received udev control message (STOP_EXEC_QUEUE)"); |
c0c6806b | 1258 | manager->stop_exec_queue = true; |
d02c6f54 YW |
1259 | break; |
1260 | case UDEV_CTRL_START_EXEC_QUEUE: | |
044497e2 | 1261 | log_debug("Received udev control message (START_EXEC_QUEUE)"); |
c0c6806b | 1262 | manager->stop_exec_queue = false; |
d7bddfa1 | 1263 | /* It is not necessary to call event_queue_start() here, as it will be called in on_post() if necessary. */ |
d02c6f54 YW |
1264 | break; |
1265 | case UDEV_CTRL_RELOAD: | |
044497e2 | 1266 | log_debug("Received udev control message (RELOAD)"); |
e9d1fae3 | 1267 | manager_reload(manager, /* force = */ true); |
d02c6f54 YW |
1268 | break; |
1269 | case UDEV_CTRL_SET_ENV: { | |
d7ac0952 FS |
1270 | _unused_ _cleanup_free_ char *old_val = NULL; |
1271 | _cleanup_free_ char *key = NULL, *val = NULL, *old_key = NULL; | |
d02c6f54 | 1272 | const char *eq; |
9b5150b6 | 1273 | |
d02c6f54 | 1274 | eq = strchr(value->buf, '='); |
9b5150b6 | 1275 | if (!eq) { |
d02c6f54 | 1276 | log_error("Invalid key format '%s'", value->buf); |
9b5150b6 YW |
1277 | return 1; |
1278 | } | |
1279 | ||
d02c6f54 | 1280 | key = strndup(value->buf, eq - value->buf); |
9b5150b6 YW |
1281 | if (!key) { |
1282 | log_oom(); | |
1283 | return 1; | |
1284 | } | |
1285 | ||
1286 | old_val = hashmap_remove2(manager->properties, key, (void **) &old_key); | |
1287 | ||
1288 | r = hashmap_ensure_allocated(&manager->properties, &string_hash_ops); | |
1289 | if (r < 0) { | |
1290 | log_oom(); | |
1291 | return 1; | |
912541b0 | 1292 | } |
9b5150b6 YW |
1293 | |
1294 | eq++; | |
f053fc33 | 1295 | if (isempty(eq)) { |
044497e2 | 1296 | log_debug("Received udev control message (ENV), unsetting '%s'", key); |
9b5150b6 YW |
1297 | |
1298 | r = hashmap_put(manager->properties, key, NULL); | |
1299 | if (r < 0) { | |
1300 | log_oom(); | |
1301 | return 1; | |
1302 | } | |
1303 | } else { | |
1304 | val = strdup(eq); | |
1305 | if (!val) { | |
1306 | log_oom(); | |
1307 | return 1; | |
1308 | } | |
1309 | ||
044497e2 | 1310 | log_debug("Received udev control message (ENV), setting '%s=%s'", key, val); |
9b5150b6 YW |
1311 | |
1312 | r = hashmap_put(manager->properties, key, val); | |
1313 | if (r < 0) { | |
1314 | log_oom(); | |
1315 | return 1; | |
1316 | } | |
1317 | } | |
1318 | ||
1319 | key = val = NULL; | |
f257a8fc | 1320 | manager_kill_workers(manager, false); |
d02c6f54 | 1321 | break; |
912541b0 | 1322 | } |
d02c6f54 YW |
1323 | case UDEV_CTRL_SET_CHILDREN_MAX: |
1324 | if (value->intval <= 0) { | |
1325 | log_debug("Received invalid udev control message (SET_MAX_CHILDREN, %i), ignoring.", value->intval); | |
1326 | return 0; | |
1327 | } | |
912541b0 | 1328 | |
d02c6f54 YW |
1329 | log_debug("Received udev control message (SET_MAX_CHILDREN), setting children_max=%i", value->intval); |
1330 | arg_children_max = value->intval; | |
1ef72b55 | 1331 | |
4bf4f50f | 1332 | notify_ready(); |
d02c6f54 YW |
1333 | break; |
1334 | case UDEV_CTRL_PING: | |
d30f43ee | 1335 | log_debug("Received udev control message (PING)"); |
d02c6f54 YW |
1336 | break; |
1337 | case UDEV_CTRL_EXIT: | |
044497e2 | 1338 | log_debug("Received udev control message (EXIT)"); |
62d43dac | 1339 | manager_exit(manager); |
d02c6f54 YW |
1340 | break; |
1341 | default: | |
1342 | log_debug("Received unknown udev control message, ignoring"); | |
912541b0 | 1343 | } |
e4f66b77 | 1344 | |
e82e8fa5 | 1345 | return 1; |
88f4b648 | 1346 | } |
4a231017 | 1347 | |
25677a05 | 1348 | static int synthesize_change_one(sd_device *dev, sd_device *target) { |
0584b17a ZJS |
1349 | int r; |
1350 | ||
25677a05 YW |
1351 | if (DEBUG_LOGGING) { |
1352 | const char *syspath = NULL; | |
1353 | (void) sd_device_get_syspath(target, &syspath); | |
1354 | log_device_debug(dev, "device is closed, synthesising 'change' on %s", strna(syspath)); | |
1355 | } | |
1356 | ||
1357 | r = sd_device_trigger(target, SD_DEVICE_CHANGE); | |
0584b17a | 1358 | if (r < 0) |
25677a05 YW |
1359 | return log_device_debug_errno(target, r, "Failed to trigger 'change' uevent: %m"); |
1360 | ||
b428efa5 MS |
1361 | DEVICE_TRACE_POINT(synthetic_change_event, dev); |
1362 | ||
0584b17a ZJS |
1363 | return 0; |
1364 | } | |
1365 | ||
70068602 | 1366 | static int synthesize_change(sd_device *dev) { |
2f9d2317 YW |
1367 | _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL; |
1368 | bool part_table_read; | |
1369 | const char *sysname; | |
1370 | sd_device *d; | |
1371 | int r, k; | |
edd32000 | 1372 | |
2f9d2317 | 1373 | r = sd_device_get_sysname(dev, &sysname); |
70068602 YW |
1374 | if (r < 0) |
1375 | return r; | |
1376 | ||
2f9d2317 YW |
1377 | if (startswith(sysname, "dm-") || block_device_is_whole_disk(dev) <= 0) |
1378 | return synthesize_change_one(dev, dev); | |
1379 | ||
1380 | r = blockdev_reread_partition_table(dev); | |
70068602 | 1381 | if (r < 0) |
2f9d2317 YW |
1382 | log_device_debug_errno(dev, r, "Failed to re-read partition table, ignoring: %m"); |
1383 | part_table_read = r >= 0; | |
70068602 | 1384 | |
2f9d2317 YW |
1385 | /* search for partitions */ |
1386 | r = partition_enumerator_new(dev, &e); | |
70068602 YW |
1387 | if (r < 0) |
1388 | return r; | |
1389 | ||
2f9d2317 YW |
1390 | /* We have partitions and re-read the table, the kernel already sent out a "change" |
1391 | * event for the disk, and "remove/add" for all partitions. */ | |
1392 | if (part_table_read && sd_device_enumerator_get_device_first(e)) | |
1393 | return 0; | |
e9fc29f4 | 1394 | |
2f9d2317 YW |
1395 | /* We have partitions but re-reading the partition table did not work, synthesize |
1396 | * "change" for the disk and all partitions. */ | |
1397 | r = synthesize_change_one(dev, dev); | |
1398 | FOREACH_DEVICE(e, d) { | |
1399 | k = synthesize_change_one(dev, d); | |
1400 | if (k < 0 && r >= 0) | |
1401 | r = k; | |
1402 | } | |
ede34445 | 1403 | |
2f9d2317 | 1404 | return r; |
edd32000 KS |
1405 | } |
1406 | ||
e82e8fa5 | 1407 | static int on_inotify(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
ea8213dc | 1408 | Manager *manager = ASSERT_PTR(userdata); |
0254e944 | 1409 | union inotify_event_buffer buffer; |
f7c1ad4f | 1410 | ssize_t l; |
0725c4b9 | 1411 | int r; |
912541b0 | 1412 | |
e82e8fa5 | 1413 | l = read(fd, &buffer, sizeof(buffer)); |
f7c1ad4f | 1414 | if (l < 0) { |
8add30a0 | 1415 | if (ERRNO_IS_TRANSIENT(errno)) |
ea8213dc | 1416 | return 0; |
912541b0 | 1417 | |
f7c1ad4f | 1418 | return log_error_errno(errno, "Failed to read inotify fd: %m"); |
912541b0 KS |
1419 | } |
1420 | ||
00adc340 | 1421 | FOREACH_INOTIFY_EVENT_WARN(e, buffer, l) { |
70068602 YW |
1422 | _cleanup_(sd_device_unrefp) sd_device *dev = NULL; |
1423 | const char *devnode; | |
1424 | ||
cd66f972 YW |
1425 | /* Do not handle IN_IGNORED here. Especially, do not try to call udev_watch_end() from the |
1426 | * main process. Otherwise, the pair of the symlinks may become inconsistent, and several | |
1427 | * garbage may remain. The old symlinks are removed by a worker that processes the | |
1428 | * corresponding 'remove' uevent; | |
1429 | * udev_event_execute_rules() -> event_execute_rules_on_remove() -> udev_watch_end(). */ | |
1430 | ||
1431 | if (!FLAGS_SET(e->mask, IN_CLOSE_WRITE)) | |
1432 | continue; | |
1433 | ||
e7f781e4 YW |
1434 | r = device_new_from_watch_handle(&dev, e->wd); |
1435 | if (r < 0) { | |
cd66f972 | 1436 | /* Device may be removed just after closed. */ |
e7f781e4 | 1437 | log_debug_errno(r, "Failed to create sd_device object from watch handle, ignoring: %m"); |
70068602 | 1438 | continue; |
e7f781e4 | 1439 | } |
912541b0 | 1440 | |
cd66f972 YW |
1441 | r = sd_device_get_devname(dev, &devnode); |
1442 | if (r < 0) { | |
1443 | /* Also here, device may be already removed. */ | |
1444 | log_device_debug_errno(dev, r, "Failed to get device node, ignoring: %m"); | |
edd32000 | 1445 | continue; |
82a5de9f | 1446 | } |
e7f781e4 | 1447 | |
cd66f972 YW |
1448 | log_device_debug(dev, "Received inotify event for %s.", devnode); |
1449 | ||
1450 | (void) event_queue_assume_block_device_unlocked(manager, dev); | |
1451 | (void) synthesize_change(dev); | |
912541b0 KS |
1452 | } |
1453 | ||
ea8213dc | 1454 | return 0; |
bd284db1 SJR |
1455 | } |
1456 | ||
0561329d | 1457 | static int on_sigterm(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
99534007 | 1458 | Manager *manager = ASSERT_PTR(userdata); |
c0c6806b | 1459 | |
62d43dac | 1460 | manager_exit(manager); |
912541b0 | 1461 | |
e82e8fa5 TG |
1462 | return 1; |
1463 | } | |
912541b0 | 1464 | |
0561329d | 1465 | static int on_sighup(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
99534007 | 1466 | Manager *manager = ASSERT_PTR(userdata); |
c0c6806b | 1467 | |
e9d1fae3 | 1468 | manager_reload(manager, /* force = */ true); |
912541b0 | 1469 | |
e82e8fa5 TG |
1470 | return 1; |
1471 | } | |
912541b0 | 1472 | |
82e0b631 YW |
1473 | static int on_sigchld(sd_event_source *s, const siginfo_t *si, void *userdata) { |
1474 | Worker *worker = ASSERT_PTR(userdata); | |
1475 | Manager *manager = ASSERT_PTR(worker->manager); | |
1476 | sd_device *dev = worker->event ? ASSERT_PTR(worker->event->dev) : NULL; | |
1477 | EventResult result; | |
c0c6806b | 1478 | |
82e0b631 | 1479 | assert(si); |
e82e8fa5 | 1480 | |
82e0b631 YW |
1481 | switch (si->si_code) { |
1482 | case CLD_EXITED: | |
1483 | if (si->si_status == 0) | |
1484 | log_device_debug(dev, "Worker ["PID_FMT"] exited.", si->si_pid); | |
1485 | else | |
1486 | log_device_warning(dev, "Worker ["PID_FMT"] exited with return code %i.", | |
1487 | si->si_pid, si->si_status); | |
1488 | result = EVENT_RESULT_EXIT_STATUS_BASE + si->si_status; | |
1489 | break; | |
e82e8fa5 | 1490 | |
82e0b631 YW |
1491 | case CLD_KILLED: |
1492 | case CLD_DUMPED: | |
1493 | log_device_warning(dev, "Worker ["PID_FMT"] terminated by signal %i (%s).", | |
1494 | si->si_pid, si->si_status, signal_to_string(si->si_status)); | |
1495 | result = EVENT_RESULT_SIGNAL_BASE + si->si_status; | |
1496 | break; | |
dc7faf2a | 1497 | |
82e0b631 YW |
1498 | default: |
1499 | assert_not_reached(); | |
1500 | } | |
dc7faf2a | 1501 | |
82e0b631 YW |
1502 | if (result != EVENT_RESULT_SUCCESS && dev) { |
1503 | /* delete state from disk */ | |
1504 | device_delete_db(dev); | |
1505 | device_tag_index(dev, NULL, false); | |
e82e8fa5 | 1506 | |
82e0b631 YW |
1507 | /* Forward kernel event to libudev listeners */ |
1508 | device_broadcast(manager->monitor, dev, result); | |
912541b0 | 1509 | } |
e82e8fa5 | 1510 | |
82e0b631 YW |
1511 | worker_free(worker); |
1512 | ||
e82e8fa5 | 1513 | return 1; |
f27125f9 | 1514 | } |
1515 | ||
693d371d | 1516 | static int on_post(sd_event_source *s, void *userdata) { |
99534007 | 1517 | Manager *manager = ASSERT_PTR(userdata); |
693d371d | 1518 | |
64903d18 | 1519 | if (manager->events) { |
5d354e52 YW |
1520 | /* Try to process pending events if idle workers exist. Why is this necessary? |
1521 | * When a worker finished an event and became idle, even if there was a pending event, | |
1522 | * the corresponding device might have been locked and the processing of the event | |
1523 | * delayed for a while, preventing the worker from processing the event immediately. | |
1524 | * Now, the device may be unlocked. Let's try again! */ | |
1525 | event_queue_start(manager); | |
b6107f01 | 1526 | return 1; |
5d354e52 | 1527 | } |
b6107f01 | 1528 | |
40293280 YW |
1529 | /* There are no queued events. Let's remove /run/udev/queue and clean up the idle processes. */ |
1530 | ||
1531 | if (unlink("/run/udev/queue") < 0) { | |
1532 | if (errno != ENOENT) | |
1533 | log_warning_errno(errno, "Failed to unlink /run/udev/queue, ignoring: %m"); | |
1534 | } else | |
1535 | log_debug("No events are queued, removing /run/udev/queue."); | |
b6107f01 YW |
1536 | |
1537 | if (!hashmap_isempty(manager->workers)) { | |
1538 | /* There are idle workers */ | |
8e543eb8 YW |
1539 | (void) event_reset_time_relative(manager->event, &manager->kill_workers_event, |
1540 | CLOCK_MONOTONIC, 3 * USEC_PER_SEC, USEC_PER_SEC, | |
1541 | on_kill_workers_event, manager, | |
1542 | 0, "kill-workers-event", false); | |
b6107f01 | 1543 | return 1; |
693d371d TG |
1544 | } |
1545 | ||
b6107f01 YW |
1546 | /* There are no idle workers. */ |
1547 | ||
10551728 YW |
1548 | if (manager->udev_node_needs_cleanup) { |
1549 | (void) udev_node_cleanup(); | |
1550 | manager->udev_node_needs_cleanup = false; | |
1551 | } | |
1552 | ||
b6107f01 YW |
1553 | if (manager->exit) |
1554 | return sd_event_exit(manager->event, 0); | |
1555 | ||
42670846 YW |
1556 | if (manager->cgroup) |
1557 | /* cleanup possible left-over processes in our cgroup */ | |
1558 | (void) cg_kill(SYSTEMD_CGROUP_CONTROLLER, manager->cgroup, SIGKILL, CGROUP_IGNORE_SELF, NULL, NULL, NULL); | |
b6107f01 | 1559 | |
693d371d TG |
1560 | return 1; |
1561 | } | |
1562 | ||
c4b69e99 | 1563 | static int listen_fds(int *ret_ctrl, int *ret_netlink) { |
254d1313 | 1564 | int ctrl_fd = -EBADF, netlink_fd = -EBADF; |
c4b69e99 | 1565 | int fd, n; |
912541b0 | 1566 | |
c4b69e99 YW |
1567 | assert(ret_ctrl); |
1568 | assert(ret_netlink); | |
fcff1e72 | 1569 | |
912541b0 | 1570 | n = sd_listen_fds(true); |
fcff1e72 TG |
1571 | if (n < 0) |
1572 | return n; | |
912541b0 KS |
1573 | |
1574 | for (fd = SD_LISTEN_FDS_START; fd < n + SD_LISTEN_FDS_START; fd++) { | |
618b3642 | 1575 | if (sd_is_socket(fd, AF_UNIX, SOCK_SEQPACKET, -1) > 0) { |
fcff1e72 TG |
1576 | if (ctrl_fd >= 0) |
1577 | return -EINVAL; | |
1578 | ctrl_fd = fd; | |
912541b0 KS |
1579 | continue; |
1580 | } | |
1581 | ||
c52cff07 | 1582 | if (sd_is_socket(fd, AF_NETLINK, SOCK_RAW, -1) > 0) { |
fcff1e72 TG |
1583 | if (netlink_fd >= 0) |
1584 | return -EINVAL; | |
1585 | netlink_fd = fd; | |
912541b0 KS |
1586 | continue; |
1587 | } | |
1588 | ||
fcff1e72 | 1589 | return -EINVAL; |
912541b0 KS |
1590 | } |
1591 | ||
c4b69e99 YW |
1592 | *ret_ctrl = ctrl_fd; |
1593 | *ret_netlink = netlink_fd; | |
912541b0 | 1594 | |
912541b0 | 1595 | return 0; |
7459bcdc KS |
1596 | } |
1597 | ||
e6f86cac | 1598 | /* |
3f85ef0f | 1599 | * read the kernel command line, in case we need to get into debug mode |
64a3494c | 1600 | * udev.log_level=<level> syslog priority |
1d84ad94 LP |
1601 | * udev.children_max=<number of workers> events are fully serialized if set to 1 |
1602 | * udev.exec_delay=<number of seconds> delay execution of every executed program | |
1603 | * udev.event_timeout=<number of seconds> seconds to wait before terminating an event | |
95ac5230 | 1604 | * udev.blockdev_read_only<=bool> mark all block devices read-only when they appear |
e6f86cac | 1605 | */ |
96287a49 | 1606 | static int parse_proc_cmdline_item(const char *key, const char *value, void *data) { |
95ac5230 | 1607 | int r; |
e6f86cac | 1608 | |
614a823c | 1609 | assert(key); |
e6f86cac | 1610 | |
64a3494c FB |
1611 | if (proc_cmdline_key_streq(key, "udev.log_level") || |
1612 | proc_cmdline_key_streq(key, "udev.log_priority")) { /* kept for backward compatibility */ | |
1d84ad94 LP |
1613 | |
1614 | if (proc_cmdline_value_missing(key, value)) | |
1615 | return 0; | |
1616 | ||
46f0fbd8 | 1617 | r = log_level_from_string(value); |
92e72467 ZJS |
1618 | if (r >= 0) |
1619 | log_set_max_level(r); | |
1d84ad94 LP |
1620 | |
1621 | } else if (proc_cmdline_key_streq(key, "udev.event_timeout")) { | |
1622 | ||
1623 | if (proc_cmdline_value_missing(key, value)) | |
1624 | return 0; | |
1625 | ||
9d9264ba | 1626 | r = parse_sec(value, &arg_event_timeout_usec); |
1d84ad94 LP |
1627 | |
1628 | } else if (proc_cmdline_key_streq(key, "udev.children_max")) { | |
1629 | ||
1630 | if (proc_cmdline_value_missing(key, value)) | |
1631 | return 0; | |
1632 | ||
020328e1 | 1633 | r = safe_atou(value, &arg_children_max); |
1d84ad94 LP |
1634 | |
1635 | } else if (proc_cmdline_key_streq(key, "udev.exec_delay")) { | |
1636 | ||
1637 | if (proc_cmdline_value_missing(key, value)) | |
1638 | return 0; | |
1639 | ||
6b92f429 | 1640 | r = parse_sec(value, &arg_exec_delay_usec); |
1d84ad94 | 1641 | |
e2099267 | 1642 | } else if (proc_cmdline_key_streq(key, "udev.timeout_signal")) { |
95ac5230 | 1643 | |
e2099267 MS |
1644 | if (proc_cmdline_value_missing(key, value)) |
1645 | return 0; | |
1646 | ||
1647 | r = signal_from_string(value); | |
1648 | if (r > 0) | |
1649 | arg_timeout_signal = r; | |
95ac5230 LP |
1650 | |
1651 | } else if (proc_cmdline_key_streq(key, "udev.blockdev_read_only")) { | |
1652 | ||
1653 | if (!value) | |
1654 | arg_blockdev_read_only = true; | |
1655 | else { | |
1656 | r = parse_boolean(value); | |
1657 | if (r < 0) | |
1658 | log_warning_errno(r, "Failed to parse udev.blockdev-read-only argument, ignoring: %s", value); | |
1659 | else | |
1660 | arg_blockdev_read_only = r; | |
1661 | } | |
1662 | ||
1663 | if (arg_blockdev_read_only) | |
1664 | log_notice("All physical block devices will be marked read-only."); | |
1665 | ||
1666 | return 0; | |
1667 | ||
1668 | } else { | |
1669 | if (startswith(key, "udev.")) | |
1670 | log_warning("Unknown udev kernel command line option \"%s\", ignoring.", key); | |
1671 | ||
1672 | return 0; | |
1673 | } | |
614a823c | 1674 | |
92e72467 ZJS |
1675 | if (r < 0) |
1676 | log_warning_errno(r, "Failed to parse \"%s=%s\", ignoring: %m", key, value); | |
1d84ad94 | 1677 | |
614a823c | 1678 | return 0; |
e6f86cac KS |
1679 | } |
1680 | ||
37ec0fdd LP |
1681 | static int help(void) { |
1682 | _cleanup_free_ char *link = NULL; | |
1683 | int r; | |
1684 | ||
1685 | r = terminal_urlify_man("systemd-udevd.service", "8", &link); | |
1686 | if (r < 0) | |
1687 | return log_oom(); | |
1688 | ||
ed216e1f | 1689 | printf("%s [OPTIONS...]\n\n" |
d1109e12 | 1690 | "Rule-based manager for device events and files.\n\n" |
5ac0162c | 1691 | " -h --help Print this message\n" |
2d19c17e MF |
1692 | " -V --version Print version of the program\n" |
1693 | " -d --daemon Detach and run in the background\n" | |
1694 | " -D --debug Enable debug output\n" | |
1695 | " -c --children-max=INT Set maximum number of workers\n" | |
1696 | " -e --exec-delay=SECONDS Seconds to wait before executing RUN=\n" | |
1697 | " -t --event-timeout=SECONDS Seconds to wait before terminating an event\n" | |
1698 | " -N --resolve-names=early|late|never\n" | |
5ac0162c | 1699 | " When to resolve users and groups\n" |
bc556335 DDM |
1700 | "\nSee the %s for details.\n", |
1701 | program_invocation_short_name, | |
1702 | link); | |
37ec0fdd LP |
1703 | |
1704 | return 0; | |
ed216e1f TG |
1705 | } |
1706 | ||
bba7a484 | 1707 | static int parse_argv(int argc, char *argv[]) { |
e2099267 MS |
1708 | enum { |
1709 | ARG_TIMEOUT_SIGNAL, | |
1710 | }; | |
1711 | ||
912541b0 | 1712 | static const struct option options[] = { |
e2099267 MS |
1713 | { "daemon", no_argument, NULL, 'd' }, |
1714 | { "debug", no_argument, NULL, 'D' }, | |
1715 | { "children-max", required_argument, NULL, 'c' }, | |
1716 | { "exec-delay", required_argument, NULL, 'e' }, | |
1717 | { "event-timeout", required_argument, NULL, 't' }, | |
1718 | { "resolve-names", required_argument, NULL, 'N' }, | |
1719 | { "help", no_argument, NULL, 'h' }, | |
1720 | { "version", no_argument, NULL, 'V' }, | |
1721 | { "timeout-signal", required_argument, NULL, ARG_TIMEOUT_SIGNAL }, | |
912541b0 KS |
1722 | {} |
1723 | }; | |
689a97f5 | 1724 | |
044497e2 | 1725 | int c, r; |
689a97f5 | 1726 | |
bba7a484 TG |
1727 | assert(argc >= 0); |
1728 | assert(argv); | |
912541b0 | 1729 | |
e14b6f21 | 1730 | while ((c = getopt_long(argc, argv, "c:de:Dt:N:hV", options, NULL)) >= 0) { |
bba7a484 | 1731 | switch (c) { |
912541b0 | 1732 | |
912541b0 | 1733 | case 'd': |
bba7a484 | 1734 | arg_daemonize = true; |
912541b0 KS |
1735 | break; |
1736 | case 'c': | |
020328e1 | 1737 | r = safe_atou(optarg, &arg_children_max); |
6f5cf8a8 | 1738 | if (r < 0) |
389f9bf2 | 1739 | log_warning_errno(r, "Failed to parse --children-max= value '%s', ignoring: %m", optarg); |
912541b0 KS |
1740 | break; |
1741 | case 'e': | |
6b92f429 | 1742 | r = parse_sec(optarg, &arg_exec_delay_usec); |
6f5cf8a8 | 1743 | if (r < 0) |
6b92f429 | 1744 | log_warning_errno(r, "Failed to parse --exec-delay= value '%s', ignoring: %m", optarg); |
912541b0 | 1745 | break; |
e2099267 MS |
1746 | case ARG_TIMEOUT_SIGNAL: |
1747 | r = signal_from_string(optarg); | |
1748 | if (r <= 0) | |
1749 | log_warning_errno(r, "Failed to parse --timeout-signal= value '%s', ignoring: %m", optarg); | |
1750 | else | |
1751 | arg_timeout_signal = r; | |
1752 | ||
1753 | break; | |
9719859c | 1754 | case 't': |
9d9264ba | 1755 | r = parse_sec(optarg, &arg_event_timeout_usec); |
f1e8664e | 1756 | if (r < 0) |
9d9264ba | 1757 | log_warning_errno(r, "Failed to parse --event-timeout= value '%s', ignoring: %m", optarg); |
9719859c | 1758 | break; |
912541b0 | 1759 | case 'D': |
bba7a484 | 1760 | arg_debug = true; |
912541b0 | 1761 | break; |
c4d44cba YW |
1762 | case 'N': { |
1763 | ResolveNameTiming t; | |
1764 | ||
1765 | t = resolve_name_timing_from_string(optarg); | |
1766 | if (t < 0) | |
1767 | log_warning("Invalid --resolve-names= value '%s', ignoring.", optarg); | |
1768 | else | |
1769 | arg_resolve_name_timing = t; | |
912541b0 | 1770 | break; |
c4d44cba | 1771 | } |
912541b0 | 1772 | case 'h': |
37ec0fdd | 1773 | return help(); |
912541b0 | 1774 | case 'V': |
681bd2c5 | 1775 | printf("%s\n", GIT_VERSION); |
bba7a484 TG |
1776 | return 0; |
1777 | case '?': | |
1778 | return -EINVAL; | |
912541b0 | 1779 | default: |
04499a70 | 1780 | assert_not_reached(); |
bba7a484 | 1781 | |
912541b0 KS |
1782 | } |
1783 | } | |
1784 | ||
bba7a484 TG |
1785 | return 1; |
1786 | } | |
1787 | ||
a1f4fd38 YW |
1788 | static int create_subcgroup(char **ret) { |
1789 | _cleanup_free_ char *cgroup = NULL, *subcgroup = NULL; | |
1790 | int r; | |
1791 | ||
1792 | if (getppid() != 1) | |
1793 | return log_debug_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), "Not invoked by PID1."); | |
1794 | ||
1795 | r = sd_booted(); | |
1796 | if (r < 0) | |
1797 | return log_debug_errno(r, "Failed to check if systemd is running: %m"); | |
1798 | if (r == 0) | |
1799 | return log_debug_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), "systemd is not running."); | |
1800 | ||
1801 | /* Get our own cgroup, we regularly kill everything udev has left behind. | |
1802 | * We only do this on systemd systems, and only if we are directly spawned | |
1803 | * by PID1. Otherwise we are not guaranteed to have a dedicated cgroup. */ | |
1804 | ||
1805 | r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 0, &cgroup); | |
1806 | if (r < 0) { | |
1807 | if (IN_SET(r, -ENOENT, -ENOMEDIUM)) | |
1808 | return log_debug_errno(r, "Dedicated cgroup not found: %m"); | |
1809 | return log_debug_errno(r, "Failed to get cgroup: %m"); | |
1810 | } | |
1811 | ||
1812 | r = cg_get_xattr_bool(SYSTEMD_CGROUP_CONTROLLER, cgroup, "trusted.delegate"); | |
00675c36 | 1813 | if (r == 0 || (r < 0 && ERRNO_IS_XATTR_ABSENT(r))) |
a1f4fd38 YW |
1814 | return log_debug_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), "The cgroup %s is not delegated to us.", cgroup); |
1815 | if (r < 0) | |
1816 | return log_debug_errno(r, "Failed to read trusted.delegate attribute: %m"); | |
1817 | ||
1818 | /* We are invoked with our own delegated cgroup tree, let's move us one level down, so that we | |
1819 | * don't collide with the "no processes in inner nodes" rule of cgroups, when the service | |
1820 | * manager invokes the ExecReload= job in the .control/ subcgroup. */ | |
1821 | ||
1822 | subcgroup = path_join(cgroup, "/udev"); | |
1823 | if (!subcgroup) | |
1824 | return log_oom_debug(); | |
1825 | ||
1826 | r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, subcgroup, 0); | |
1827 | if (r < 0) | |
1828 | return log_debug_errno(r, "Failed to create %s subcgroup: %m", subcgroup); | |
1829 | ||
1830 | log_debug("Created %s subcgroup.", subcgroup); | |
1831 | if (ret) | |
1832 | *ret = TAKE_PTR(subcgroup); | |
1833 | return 0; | |
1834 | } | |
1835 | ||
1836 | static int manager_new(Manager **ret, int fd_ctrl, int fd_uevent) { | |
c0c6806b | 1837 | _cleanup_(manager_freep) Manager *manager = NULL; |
a1f4fd38 | 1838 | _cleanup_free_ char *cgroup = NULL; |
b5af8c8c | 1839 | int r; |
c0c6806b TG |
1840 | |
1841 | assert(ret); | |
1842 | ||
a1f4fd38 YW |
1843 | (void) create_subcgroup(&cgroup); |
1844 | ||
6f19b42f | 1845 | manager = new(Manager, 1); |
c0c6806b TG |
1846 | if (!manager) |
1847 | return log_oom(); | |
1848 | ||
6f19b42f | 1849 | *manager = (Manager) { |
254d1313 | 1850 | .inotify_fd = -EBADF, |
6f19b42f | 1851 | .worker_watch = { -1, -1 }, |
a1f4fd38 | 1852 | .cgroup = TAKE_PTR(cgroup), |
6f19b42f | 1853 | }; |
e237d8cb | 1854 | |
100bc5bf YW |
1855 | r = udev_ctrl_new_from_fd(&manager->ctrl, fd_ctrl); |
1856 | if (r < 0) | |
1857 | return log_error_errno(r, "Failed to initialize udev control socket: %m"); | |
e237d8cb | 1858 | |
b5af8c8c ZJS |
1859 | r = udev_ctrl_enable_receiving(manager->ctrl); |
1860 | if (r < 0) | |
1861 | return log_error_errno(r, "Failed to bind udev control socket: %m"); | |
c4b69e99 | 1862 | |
7f2e3a14 YW |
1863 | r = device_monitor_new_full(&manager->monitor, MONITOR_GROUP_KERNEL, fd_uevent); |
1864 | if (r < 0) | |
1865 | return log_error_errno(r, "Failed to initialize device monitor: %m"); | |
e237d8cb | 1866 | |
1ffadeaa FB |
1867 | /* Bump receiver buffer, but only if we are not called via socket activation, as in that |
1868 | * case systemd sets the receive buffer size for us, and the value in the .socket unit | |
1869 | * should take full effect. */ | |
e77f52e5 YW |
1870 | if (fd_uevent < 0) { |
1871 | r = sd_device_monitor_set_receive_buffer_size(manager->monitor, 128 * 1024 * 1024); | |
1872 | if (r < 0) | |
1873 | log_warning_errno(r, "Failed to set receive buffer size for device monitor, ignoring: %m"); | |
1874 | } | |
c4b69e99 | 1875 | |
f714ecd4 YW |
1876 | (void) sd_device_monitor_set_description(manager->monitor, "manager"); |
1877 | ||
b5af8c8c ZJS |
1878 | r = device_monitor_enable_receiving(manager->monitor); |
1879 | if (r < 0) | |
1880 | return log_error_errno(r, "Failed to bind netlink socket: %m"); | |
1881 | ||
1a0bd015 YW |
1882 | manager->log_level = log_get_max_level(); |
1883 | ||
b5af8c8c ZJS |
1884 | *ret = TAKE_PTR(manager); |
1885 | ||
1886 | return 0; | |
1887 | } | |
1888 | ||
1889 | static int main_loop(Manager *manager) { | |
d02c6f54 | 1890 | int fd_worker, r; |
b5af8c8c | 1891 | |
76e62a4d YW |
1892 | manager->pid = getpid_cached(); |
1893 | ||
e237d8cb | 1894 | /* unnamed socket from workers to the main daemon */ |
618b3642 | 1895 | r = socketpair(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0, manager->worker_watch); |
e237d8cb | 1896 | if (r < 0) |
044497e2 | 1897 | return log_error_errno(errno, "Failed to create socketpair for communicating with workers: %m"); |
e237d8cb | 1898 | |
693d371d | 1899 | fd_worker = manager->worker_watch[READ_END]; |
e237d8cb | 1900 | |
2ff48e98 | 1901 | r = setsockopt_int(fd_worker, SOL_SOCKET, SO_PASSCRED, true); |
e237d8cb | 1902 | if (r < 0) |
044497e2 | 1903 | return log_error_errno(r, "Failed to enable SO_PASSCRED: %m"); |
e237d8cb | 1904 | |
df7ee959 YW |
1905 | manager->inotify_fd = inotify_init1(IN_CLOEXEC); |
1906 | if (manager->inotify_fd < 0) | |
1907 | return log_error_errno(errno, "Failed to create inotify descriptor: %m"); | |
e237d8cb | 1908 | |
df7ee959 | 1909 | udev_watch_restore(manager->inotify_fd); |
e237d8cb TG |
1910 | |
1911 | /* block and listen to all signals on signalfd */ | |
72c0a2c2 | 1912 | assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, SIGHUP, SIGCHLD, -1) >= 0); |
693d371d | 1913 | |
49f997f3 TG |
1914 | r = sd_event_default(&manager->event); |
1915 | if (r < 0) | |
044497e2 | 1916 | return log_error_errno(r, "Failed to allocate event loop: %m"); |
49f997f3 | 1917 | |
693d371d TG |
1918 | r = sd_event_add_signal(manager->event, NULL, SIGINT, on_sigterm, manager); |
1919 | if (r < 0) | |
044497e2 | 1920 | return log_error_errno(r, "Failed to create SIGINT event source: %m"); |
693d371d TG |
1921 | |
1922 | r = sd_event_add_signal(manager->event, NULL, SIGTERM, on_sigterm, manager); | |
1923 | if (r < 0) | |
044497e2 | 1924 | return log_error_errno(r, "Failed to create SIGTERM event source: %m"); |
693d371d TG |
1925 | |
1926 | r = sd_event_add_signal(manager->event, NULL, SIGHUP, on_sighup, manager); | |
1927 | if (r < 0) | |
044497e2 | 1928 | return log_error_errno(r, "Failed to create SIGHUP event source: %m"); |
693d371d | 1929 | |
693d371d TG |
1930 | r = sd_event_set_watchdog(manager->event, true); |
1931 | if (r < 0) | |
044497e2 | 1932 | return log_error_errno(r, "Failed to create watchdog event source: %m"); |
693d371d | 1933 | |
d02c6f54 YW |
1934 | r = udev_ctrl_attach_event(manager->ctrl, manager->event); |
1935 | if (r < 0) | |
1936 | return log_error_errno(r, "Failed to attach event to udev control: %m"); | |
b5af8c8c | 1937 | |
d02c6f54 | 1938 | r = udev_ctrl_start(manager->ctrl, on_ctrl_msg, manager); |
693d371d | 1939 | if (r < 0) |
d02c6f54 | 1940 | return log_error_errno(r, "Failed to start device monitor: %m"); |
693d371d TG |
1941 | |
1942 | /* This needs to be after the inotify and uevent handling, to make sure | |
1943 | * that the ping is send back after fully processing the pending uevents | |
1944 | * (including the synthetic ones we may create due to inotify events). | |
1945 | */ | |
d02c6f54 | 1946 | r = sd_event_source_set_priority(udev_ctrl_get_event_source(manager->ctrl), SD_EVENT_PRIORITY_IDLE); |
693d371d | 1947 | if (r < 0) |
044497e2 | 1948 | return log_error_errno(r, "Failed to set IDLE event priority for udev control event source: %m"); |
693d371d | 1949 | |
df7ee959 | 1950 | r = sd_event_add_io(manager->event, &manager->inotify_event, manager->inotify_fd, EPOLLIN, on_inotify, manager); |
693d371d | 1951 | if (r < 0) |
044497e2 | 1952 | return log_error_errno(r, "Failed to create inotify event source: %m"); |
693d371d | 1953 | |
f00d2b6d YW |
1954 | r = sd_device_monitor_attach_event(manager->monitor, manager->event); |
1955 | if (r < 0) | |
1956 | return log_error_errno(r, "Failed to attach event to device monitor: %m"); | |
1957 | ||
1958 | r = sd_device_monitor_start(manager->monitor, on_uevent, manager); | |
693d371d | 1959 | if (r < 0) |
f00d2b6d YW |
1960 | return log_error_errno(r, "Failed to start device monitor: %m"); |
1961 | ||
693d371d TG |
1962 | r = sd_event_add_io(manager->event, NULL, fd_worker, EPOLLIN, on_worker, manager); |
1963 | if (r < 0) | |
044497e2 | 1964 | return log_error_errno(r, "Failed to create worker event source: %m"); |
693d371d TG |
1965 | |
1966 | r = sd_event_add_post(manager->event, NULL, on_post, manager); | |
1967 | if (r < 0) | |
044497e2 | 1968 | return log_error_errno(r, "Failed to create post event source: %m"); |
e237d8cb | 1969 | |
e9d1fae3 YW |
1970 | manager->last_usec = now(CLOCK_MONOTONIC); |
1971 | ||
b5af8c8c | 1972 | udev_builtin_init(); |
077fc5e2 | 1973 | |
c238a1f5 | 1974 | r = udev_rules_load(&manager->rules, arg_resolve_name_timing); |
298316eb | 1975 | if (r < 0) |
b5af8c8c | 1976 | return log_error_errno(r, "Failed to read udev rules: %m"); |
077fc5e2 DH |
1977 | |
1978 | r = udev_rules_apply_static_dev_perms(manager->rules); | |
1979 | if (r < 0) | |
6e40ed53 | 1980 | log_warning_errno(r, "Failed to apply permissions on static device nodes, ignoring: %m"); |
077fc5e2 | 1981 | |
4bf4f50f | 1982 | notify_ready(); |
077fc5e2 DH |
1983 | |
1984 | r = sd_event_loop(manager->event); | |
44dcf454 | 1985 | if (r < 0) |
044497e2 | 1986 | log_error_errno(r, "Event loop failed: %m"); |
077fc5e2 | 1987 | |
077fc5e2 DH |
1988 | sd_notify(false, |
1989 | "STOPPING=1\n" | |
1990 | "STATUS=Shutting down..."); | |
077fc5e2 DH |
1991 | return r; |
1992 | } | |
1993 | ||
63e2d171 | 1994 | int run_udevd(int argc, char *argv[]) { |
b5af8c8c | 1995 | _cleanup_(manager_freep) Manager *manager = NULL; |
254d1313 | 1996 | int fd_ctrl = -EBADF, fd_uevent = -EBADF; |
e5d7bce1 | 1997 | int r; |
bba7a484 | 1998 | |
bba7a484 | 1999 | log_set_target(LOG_TARGET_AUTO); |
6b413782 | 2000 | log_open(); |
e2099267 | 2001 | udev_parse_config_full(&arg_children_max, &arg_exec_delay_usec, &arg_event_timeout_usec, &arg_resolve_name_timing, &arg_timeout_signal); |
bba7a484 | 2002 | log_parse_environment(); |
6b413782 | 2003 | log_open(); /* Done again to update after reading configuration. */ |
bba7a484 | 2004 | |
bba7a484 TG |
2005 | r = parse_argv(argc, argv); |
2006 | if (r <= 0) | |
0c5a109a | 2007 | return r; |
bba7a484 | 2008 | |
1d84ad94 | 2009 | r = proc_cmdline_parse(parse_proc_cmdline_item, NULL, PROC_CMDLINE_STRIP_RD_PREFIX); |
614a823c | 2010 | if (r < 0) |
044497e2 | 2011 | log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m"); |
912541b0 | 2012 | |
78d3e041 KS |
2013 | if (arg_debug) { |
2014 | log_set_target(LOG_TARGET_CONSOLE); | |
bba7a484 | 2015 | log_set_max_level(LOG_DEBUG); |
78d3e041 | 2016 | } |
bba7a484 | 2017 | |
fba868fa LP |
2018 | r = must_be_root(); |
2019 | if (r < 0) | |
0c5a109a | 2020 | return r; |
912541b0 | 2021 | |
712cebf1 | 2022 | if (arg_children_max == 0) { |
fe56acd8 | 2023 | unsigned long cpu_limit, mem_limit, cpu_count = 1; |
d457ff83 | 2024 | |
fe56acd8 LP |
2025 | r = cpus_in_affinity_mask(); |
2026 | if (r < 0) | |
2027 | log_warning_errno(r, "Failed to determine number of local CPUs, ignoring: %m"); | |
2028 | else | |
2029 | cpu_count = r; | |
88bd5a32 FB |
2030 | |
2031 | cpu_limit = cpu_count * 2 + 16; | |
2032 | mem_limit = MAX(physical_memory() / (128UL*1024*1024), 10U); | |
912541b0 | 2033 | |
88bd5a32 FB |
2034 | arg_children_max = MIN(cpu_limit, mem_limit); |
2035 | arg_children_max = MIN(WORKER_NUM_MAX, arg_children_max); | |
e438c57a | 2036 | |
044497e2 | 2037 | log_debug("Set children_max to %u", arg_children_max); |
d457ff83 | 2038 | } |
912541b0 | 2039 | |
712cebf1 | 2040 | /* set umask before creating any file/directory */ |
712cebf1 | 2041 | umask(022); |
912541b0 | 2042 | |
c3dacc8b | 2043 | r = mac_selinux_init(); |
0c5a109a | 2044 | if (r < 0) |
a9ba0e32 | 2045 | return r; |
912541b0 | 2046 | |
3f692e2e | 2047 | r = RET_NERRNO(mkdir("/run/udev", 0755)); |
0c5a109a ZJS |
2048 | if (r < 0 && r != -EEXIST) |
2049 | return log_error_errno(r, "Failed to create /run/udev: %m"); | |
712cebf1 | 2050 | |
b7f74dd4 | 2051 | r = listen_fds(&fd_ctrl, &fd_uevent); |
0c5a109a ZJS |
2052 | if (r < 0) |
2053 | return log_error_errno(r, "Failed to listen on fds: %m"); | |
b7f74dd4 | 2054 | |
a1f4fd38 | 2055 | r = manager_new(&manager, fd_ctrl, fd_uevent); |
b5af8c8c ZJS |
2056 | if (r < 0) |
2057 | return log_error_errno(r, "Failed to create manager: %m"); | |
2058 | ||
bba7a484 | 2059 | if (arg_daemonize) { |
912541b0 | 2060 | pid_t pid; |
912541b0 | 2061 | |
2751ad9c | 2062 | log_info("Starting systemd-udevd version " GIT_VERSION); |
3cbb2057 | 2063 | |
40e749b5 | 2064 | /* connect /dev/null to stdin, stdout, stderr */ |
c76cf844 AK |
2065 | if (log_get_max_level() < LOG_DEBUG) { |
2066 | r = make_null_stdio(); | |
2067 | if (r < 0) | |
2068 | log_warning_errno(r, "Failed to redirect standard streams to /dev/null: %m"); | |
2069 | } | |
2070 | ||
912541b0 | 2071 | pid = fork(); |
0c5a109a ZJS |
2072 | if (pid < 0) |
2073 | return log_error_errno(errno, "Failed to fork daemon: %m"); | |
2074 | if (pid > 0) | |
2075 | /* parent */ | |
2076 | return 0; | |
912541b0 | 2077 | |
0c5a109a | 2078 | /* child */ |
ece0fe12 | 2079 | (void) setsid(); |
7500cd5e | 2080 | } |
912541b0 | 2081 | |
76e62a4d | 2082 | return main_loop(manager); |
7fafc032 | 2083 | } |