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d6c9574f | 1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
5cb5a6ff | 2 | |
a7334b09 LP |
3 | /*** |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2010 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
9 | under the terms of the GNU Lesser General Public License as published by |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
a7334b09 LP |
11 | (at your option) any later version. |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 16 | Lesser General Public License for more details. |
a7334b09 | 17 | |
5430f7f2 | 18 | You should have received a copy of the GNU Lesser General Public License |
a7334b09 LP |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
20 | ***/ | |
21 | ||
25ac040b | 22 | #include <errno.h> |
f94ea366 | 23 | #include <sys/epoll.h> |
25ac040b LP |
24 | #include <libudev.h> |
25 | ||
5cb5a6ff | 26 | #include "strv.h" |
25ac040b | 27 | #include "log.h" |
9e2f7c11 | 28 | #include "unit-name.h" |
4139c1b2 | 29 | #include "dbus-device.h" |
f6a6225e | 30 | #include "def.h" |
9eb977db | 31 | #include "path-util.h" |
718db961 | 32 | #include "udev-util.h" |
9670d583 LP |
33 | #include "unit.h" |
34 | #include "swap.h" | |
35 | #include "device.h" | |
5cb5a6ff | 36 | |
f50e0a01 LP |
37 | static const UnitActiveState state_translation_table[_DEVICE_STATE_MAX] = { |
38 | [DEVICE_DEAD] = UNIT_INACTIVE, | |
73608ed9 | 39 | [DEVICE_PLUGGED] = UNIT_ACTIVE |
f50e0a01 LP |
40 | }; |
41 | ||
718db961 LP |
42 | static int device_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata); |
43 | ||
8fe914ec | 44 | static void device_unset_sysfs(Device *d) { |
f1421cc6 | 45 | Hashmap *devices; |
8fe914ec LP |
46 | Device *first; |
47 | ||
48 | assert(d); | |
49 | ||
a7f241db LP |
50 | if (!d->sysfs) |
51 | return; | |
52 | ||
53 | /* Remove this unit from the chain of devices which share the | |
54 | * same sysfs path. */ | |
f1421cc6 LP |
55 | devices = UNIT(d)->manager->devices_by_sysfs; |
56 | first = hashmap_get(devices, d->sysfs); | |
71fda00f | 57 | LIST_REMOVE(same_sysfs, first, d); |
8fe914ec | 58 | |
a7f241db | 59 | if (first) |
f1421cc6 | 60 | hashmap_remove_and_replace(devices, d->sysfs, first->sysfs, first); |
a7f241db | 61 | else |
f1421cc6 | 62 | hashmap_remove(devices, d->sysfs); |
a7f241db LP |
63 | |
64 | free(d->sysfs); | |
65 | d->sysfs = NULL; | |
8fe914ec LP |
66 | } |
67 | ||
faf919f1 LP |
68 | static void device_init(Unit *u) { |
69 | Device *d = DEVICE(u); | |
70 | ||
71 | assert(d); | |
1124fe6f | 72 | assert(UNIT(d)->load_state == UNIT_STUB); |
faf919f1 | 73 | |
8fe914ec LP |
74 | /* In contrast to all other unit types we timeout jobs waiting |
75 | * for devices by default. This is because they otherwise wait | |
35b8ca3a | 76 | * indefinitely for plugged in devices, something which cannot |
8fe914ec LP |
77 | * happen for the other units since their operations time out |
78 | * anyway. */ | |
f1421cc6 | 79 | u->job_timeout = u->manager->default_timeout_start_usec; |
c8f4d764 | 80 | |
f1421cc6 LP |
81 | u->ignore_on_isolate = true; |
82 | u->ignore_on_snapshot = true; | |
faf919f1 LP |
83 | } |
84 | ||
87f0e418 LP |
85 | static void device_done(Unit *u) { |
86 | Device *d = DEVICE(u); | |
034c6ed7 LP |
87 | |
88 | assert(d); | |
e537352b | 89 | |
8fe914ec | 90 | device_unset_sysfs(d); |
e537352b LP |
91 | } |
92 | ||
f50e0a01 LP |
93 | static void device_set_state(Device *d, DeviceState state) { |
94 | DeviceState old_state; | |
95 | assert(d); | |
5cb5a6ff | 96 | |
f50e0a01 LP |
97 | old_state = d->state; |
98 | d->state = state; | |
5cb5a6ff | 99 | |
e537352b | 100 | if (state != old_state) |
66870f90 ZJS |
101 | log_debug_unit(UNIT(d)->id, |
102 | "%s changed %s -> %s", UNIT(d)->id, | |
103 | device_state_to_string(old_state), | |
104 | device_state_to_string(state)); | |
f50e0a01 | 105 | |
e2f3b44c | 106 | unit_notify(UNIT(d), state_translation_table[old_state], state_translation_table[state], true); |
f50e0a01 LP |
107 | } |
108 | ||
109 | static int device_coldplug(Unit *u) { | |
110 | Device *d = DEVICE(u); | |
111 | ||
112 | assert(d); | |
113 | assert(d->state == DEVICE_DEAD); | |
114 | ||
115 | if (d->sysfs) | |
73608ed9 | 116 | device_set_state(d, DEVICE_PLUGGED); |
f50e0a01 LP |
117 | |
118 | return 0; | |
119 | } | |
120 | ||
121 | static void device_dump(Unit *u, FILE *f, const char *prefix) { | |
25ac040b | 122 | Device *d = DEVICE(u); |
5cb5a6ff | 123 | |
25ac040b | 124 | assert(d); |
5cb5a6ff LP |
125 | |
126 | fprintf(f, | |
25ac040b LP |
127 | "%sDevice State: %s\n" |
128 | "%sSysfs Path: %s\n", | |
a16e1123 | 129 | prefix, device_state_to_string(d->state), |
f50e0a01 LP |
130 | prefix, strna(d->sysfs)); |
131 | } | |
132 | ||
44a6b1b6 | 133 | _pure_ static UnitActiveState device_active_state(Unit *u) { |
f50e0a01 LP |
134 | assert(u); |
135 | ||
136 | return state_translation_table[DEVICE(u)->state]; | |
25ac040b LP |
137 | } |
138 | ||
44a6b1b6 | 139 | _pure_ static const char *device_sub_state_to_string(Unit *u) { |
10a94420 LP |
140 | assert(u); |
141 | ||
a16e1123 | 142 | return device_state_to_string(DEVICE(u)->state); |
10a94420 LP |
143 | } |
144 | ||
8fe914ec | 145 | static int device_add_escaped_name(Unit *u, const char *dn) { |
718db961 | 146 | _cleanup_free_ char *e = NULL; |
25ac040b LP |
147 | int r; |
148 | ||
149 | assert(u); | |
150 | assert(dn); | |
151 | assert(dn[0] == '/'); | |
152 | ||
b0193f1c LP |
153 | e = unit_name_from_path(dn, ".device"); |
154 | if (!e) | |
25ac040b LP |
155 | return -ENOMEM; |
156 | ||
157 | r = unit_add_name(u, e); | |
25ac040b LP |
158 | if (r < 0 && r != -EEXIST) |
159 | return r; | |
160 | ||
161 | return 0; | |
162 | } | |
163 | ||
aab14b13 | 164 | static int device_find_escape_name(Manager *m, const char *dn, Unit **_u) { |
718db961 | 165 | _cleanup_free_ char *e = NULL; |
aab14b13 LP |
166 | Unit *u; |
167 | ||
168 | assert(m); | |
169 | assert(dn); | |
170 | assert(dn[0] == '/'); | |
171 | assert(_u); | |
172 | ||
b0193f1c LP |
173 | e = unit_name_from_path(dn, ".device"); |
174 | if (!e) | |
aab14b13 LP |
175 | return -ENOMEM; |
176 | ||
177 | u = manager_get_unit(m, e); | |
aab14b13 LP |
178 | if (u) { |
179 | *_u = u; | |
180 | return 1; | |
181 | } | |
182 | ||
183 | return 0; | |
184 | } | |
185 | ||
965e5c5d LP |
186 | static int device_make_description(Unit *u, struct udev_device *dev, const char *path) { |
187 | const char *model; | |
188 | ||
189 | assert(u); | |
190 | assert(dev); | |
191 | assert(path); | |
192 | ||
193 | model = udev_device_get_property_value(dev, "ID_MODEL_FROM_DATABASE"); | |
194 | if (!model) | |
195 | model = udev_device_get_property_value(dev, "ID_MODEL"); | |
196 | ||
197 | if (model) { | |
198 | const char *label; | |
199 | ||
200 | /* Try to concatenate the device model string with a label, if there is one */ | |
201 | label = udev_device_get_property_value(dev, "ID_FS_LABEL"); | |
202 | if (!label) | |
203 | label = udev_device_get_property_value(dev, "ID_PART_ENTRY_NAME"); | |
204 | if (!label) | |
205 | label = udev_device_get_property_value(dev, "ID_PART_ENTRY_NUMBER"); | |
206 | ||
207 | if (label) { | |
208 | _cleanup_free_ char *j; | |
209 | ||
210 | j = strjoin(model, " ", label, NULL); | |
211 | if (j) | |
212 | return unit_set_description(u, j); | |
213 | } | |
214 | ||
215 | return unit_set_description(u, model); | |
216 | } | |
217 | ||
218 | return unit_set_description(u, path); | |
219 | } | |
220 | ||
221 | static int device_add_udev_wants(Unit *u, struct udev_device *dev) { | |
222 | const char *wants; | |
223 | char *state, *w; | |
224 | size_t l; | |
225 | int r; | |
226 | ||
227 | assert(u); | |
228 | assert(dev); | |
229 | ||
230 | wants = udev_device_get_property_value( | |
231 | dev, | |
232 | u->manager->running_as == SYSTEMD_USER ? "SYSTEMD_USER_WANTS" : "SYSTEMD_WANTS"); | |
233 | ||
234 | if (!wants) | |
235 | return 0; | |
236 | ||
237 | FOREACH_WORD_QUOTED(w, l, wants, state) { | |
238 | _cleanup_free_ char *n = NULL; | |
239 | char e[l+1]; | |
240 | ||
241 | memcpy(e, w, l); | |
242 | e[l] = 0; | |
243 | ||
244 | n = unit_name_mangle(e, MANGLE_NOGLOB); | |
245 | if (!n) | |
246 | return -ENOMEM; | |
247 | ||
248 | r = unit_add_dependency_by_name(u, UNIT_WANTS, n, NULL, true); | |
249 | if (r < 0) | |
250 | return r; | |
251 | } | |
252 | ||
253 | return 0; | |
254 | } | |
255 | ||
8fe914ec | 256 | static int device_update_unit(Manager *m, struct udev_device *dev, const char *path, bool main) { |
965e5c5d | 257 | const char *sysfs; |
25ac040b | 258 | Unit *u = NULL; |
25ac040b | 259 | bool delete; |
965e5c5d | 260 | int r; |
25ac040b LP |
261 | |
262 | assert(m); | |
965e5c5d LP |
263 | assert(dev); |
264 | assert(path); | |
25ac040b | 265 | |
b47d419c ZJS |
266 | sysfs = udev_device_get_syspath(dev); |
267 | if (!sysfs) | |
f1421cc6 | 268 | return 0; |
7f275a9f | 269 | |
b47d419c ZJS |
270 | r = device_find_escape_name(m, path, &u); |
271 | if (r < 0) | |
aab14b13 | 272 | return r; |
25ac040b | 273 | |
5845b46b | 274 | if (u && DEVICE(u)->sysfs && !path_equal(DEVICE(u)->sysfs, sysfs)) |
8fe914ec | 275 | return -EEXIST; |
25ac040b | 276 | |
aab14b13 LP |
277 | if (!u) { |
278 | delete = true; | |
279 | ||
7d17cfbc MS |
280 | u = unit_new(m, sizeof(Device)); |
281 | if (!u) | |
f1421cc6 | 282 | return log_oom(); |
25ac040b | 283 | |
7d17cfbc MS |
284 | r = device_add_escaped_name(u, path); |
285 | if (r < 0) | |
25ac040b LP |
286 | goto fail; |
287 | ||
ee6cb288 LP |
288 | unit_add_to_load_queue(u); |
289 | } else | |
290 | delete = false; | |
291 | ||
292 | /* If this was created via some dependency and has not | |
293 | * actually been seen yet ->sysfs will not be | |
294 | * initialized. Hence initialize it if necessary. */ | |
295 | ||
296 | if (!DEVICE(u)->sysfs) { | |
297 | Device *first; | |
298 | ||
718db961 LP |
299 | DEVICE(u)->sysfs = strdup(sysfs); |
300 | if (!DEVICE(u)->sysfs) { | |
25ac040b LP |
301 | r = -ENOMEM; |
302 | goto fail; | |
303 | } | |
304 | ||
718db961 LP |
305 | r = hashmap_ensure_allocated(&m->devices_by_sysfs, string_hash_func, string_compare_func); |
306 | if (r < 0) | |
307 | goto fail; | |
25ac040b | 308 | |
8fe914ec | 309 | first = hashmap_get(m->devices_by_sysfs, sysfs); |
71fda00f | 310 | LIST_PREPEND(same_sysfs, first, DEVICE(u)); |
8fe914ec | 311 | |
b47d419c ZJS |
312 | r = hashmap_replace(m->devices_by_sysfs, DEVICE(u)->sysfs, first); |
313 | if (r < 0) | |
25ac040b | 314 | goto fail; |
ee6cb288 | 315 | } |
8fe914ec | 316 | |
965e5c5d | 317 | device_make_description(u, dev, path); |
aab14b13 | 318 | |
8fe914ec LP |
319 | if (main) { |
320 | /* The additional systemd udev properties we only | |
321 | * interpret for the main object */ | |
25ac040b | 322 | |
965e5c5d LP |
323 | r = device_add_udev_wants(u, dev); |
324 | if (r < 0) | |
325 | goto fail; | |
a7f241db | 326 | } |
f94ea366 | 327 | |
f1421cc6 LP |
328 | /* Note that this won't dispatch the load queue, the caller |
329 | * has to do that if needed and appropriate */ | |
330 | ||
c1e1601e | 331 | unit_add_to_dbus_queue(u); |
25ac040b LP |
332 | return 0; |
333 | ||
334 | fail: | |
ee5f3479 LP |
335 | log_warning("Failed to load device unit: %s", strerror(-r)); |
336 | ||
25ac040b LP |
337 | if (delete && u) |
338 | unit_free(u); | |
ee5f3479 | 339 | |
25ac040b LP |
340 | return r; |
341 | } | |
342 | ||
f1421cc6 LP |
343 | static int device_process_new_device(Manager *m, struct udev_device *dev) { |
344 | const char *sysfs, *dn, *alias; | |
8fe914ec | 345 | struct udev_list_entry *item = NULL, *first = NULL; |
003ac9d0 | 346 | int r; |
8fe914ec LP |
347 | |
348 | assert(m); | |
349 | ||
718db961 LP |
350 | sysfs = udev_device_get_syspath(dev); |
351 | if (!sysfs) | |
f1421cc6 | 352 | return 0; |
8fe914ec LP |
353 | |
354 | /* Add the main unit named after the sysfs path */ | |
003ac9d0 HH |
355 | r = device_update_unit(m, dev, sysfs, true); |
356 | if (r < 0) | |
357 | return r; | |
8fe914ec LP |
358 | |
359 | /* Add an additional unit for the device node */ | |
f1421cc6 LP |
360 | dn = udev_device_get_devnode(dev); |
361 | if (dn) | |
8fe914ec LP |
362 | device_update_unit(m, dev, dn, false); |
363 | ||
364 | /* Add additional units for all symlinks */ | |
365 | first = udev_device_get_devlinks_list_entry(dev); | |
366 | udev_list_entry_foreach(item, first) { | |
367 | const char *p; | |
5845b46b | 368 | struct stat st; |
8fe914ec LP |
369 | |
370 | /* Don't bother with the /dev/block links */ | |
371 | p = udev_list_entry_get_name(item); | |
372 | ||
373 | if (path_startswith(p, "/dev/block/") || | |
374 | path_startswith(p, "/dev/char/")) | |
375 | continue; | |
376 | ||
5845b46b LP |
377 | /* Verify that the symlink in the FS actually belongs |
378 | * to this device. This is useful to deal with | |
379 | * conflicting devices, e.g. when two disks want the | |
380 | * same /dev/disk/by-label/xxx link because they have | |
381 | * the same label. We want to make sure that the same | |
382 | * device that won the symlink wins in systemd, so we | |
383 | * check the device node major/minor*/ | |
384 | if (stat(p, &st) >= 0) | |
385 | if ((!S_ISBLK(st.st_mode) && !S_ISCHR(st.st_mode)) || | |
386 | st.st_rdev != udev_device_get_devnum(dev)) | |
387 | continue; | |
388 | ||
8fe914ec LP |
389 | device_update_unit(m, dev, p, false); |
390 | } | |
391 | ||
f1421cc6 LP |
392 | /* Add additional units for all explicitly configured |
393 | * aliases */ | |
394 | alias = udev_device_get_property_value(dev, "SYSTEMD_ALIAS"); | |
395 | if (alias) { | |
396 | char *state, *w; | |
397 | size_t l; | |
8fe914ec | 398 | |
f1421cc6 LP |
399 | FOREACH_WORD_QUOTED(w, l, alias, state) { |
400 | char e[l+1]; | |
8fe914ec | 401 | |
f1421cc6 LP |
402 | memcpy(e, w, l); |
403 | e[l] = 0; | |
404 | ||
405 | if (path_is_absolute(e)) | |
406 | device_update_unit(m, dev, e, false); | |
407 | else | |
408 | log_warning("SYSTEMD_ALIAS for %s is not an absolute path, ignoring: %s", sysfs, e); | |
409 | } | |
8fe914ec LP |
410 | } |
411 | ||
412 | return 0; | |
413 | } | |
414 | ||
f1421cc6 LP |
415 | static void device_set_path_plugged(Manager *m, struct udev_device *dev) { |
416 | const char *sysfs; | |
417 | Device *d, *l; | |
25ac040b LP |
418 | |
419 | assert(m); | |
f1421cc6 | 420 | assert(dev); |
25ac040b | 421 | |
f1421cc6 LP |
422 | sysfs = udev_device_get_syspath(dev); |
423 | if (!sysfs) | |
424 | return; | |
25ac040b | 425 | |
f1421cc6 LP |
426 | l = hashmap_get(m->devices_by_sysfs, sysfs); |
427 | LIST_FOREACH(same_sysfs, d, l) | |
428 | device_set_state(d, DEVICE_PLUGGED); | |
25ac040b LP |
429 | } |
430 | ||
f94ea366 LP |
431 | static int device_process_removed_device(Manager *m, struct udev_device *dev) { |
432 | const char *sysfs; | |
f94ea366 LP |
433 | Device *d; |
434 | ||
435 | assert(m); | |
436 | assert(dev); | |
437 | ||
f1421cc6 LP |
438 | sysfs = udev_device_get_syspath(dev); |
439 | if (!sysfs) | |
f94ea366 LP |
440 | return -ENOMEM; |
441 | ||
8fe914ec LP |
442 | /* Remove all units of this sysfs path */ |
443 | while ((d = hashmap_get(m->devices_by_sysfs, sysfs))) { | |
444 | device_unset_sysfs(d); | |
445 | device_set_state(d, DEVICE_DEAD); | |
446 | } | |
f94ea366 | 447 | |
f94ea366 LP |
448 | return 0; |
449 | } | |
450 | ||
f1421cc6 LP |
451 | static bool device_is_ready(struct udev_device *dev) { |
452 | const char *ready; | |
453 | ||
454 | assert(dev); | |
455 | ||
456 | ready = udev_device_get_property_value(dev, "SYSTEMD_READY"); | |
457 | if (!ready) | |
458 | return true; | |
459 | ||
460 | return parse_boolean(ready) != 0; | |
461 | } | |
462 | ||
463 | static int device_process_new_path(Manager *m, const char *path) { | |
464 | _cleanup_udev_device_unref_ struct udev_device *dev = NULL; | |
465 | ||
466 | assert(m); | |
467 | assert(path); | |
468 | ||
469 | dev = udev_device_new_from_syspath(m->udev, path); | |
470 | if (!dev) | |
471 | return log_oom(); | |
472 | ||
473 | if (!device_is_ready(dev)) | |
474 | return 0; | |
475 | ||
476 | return device_process_new_device(m, dev); | |
477 | } | |
478 | ||
a7f241db LP |
479 | static Unit *device_following(Unit *u) { |
480 | Device *d = DEVICE(u); | |
481 | Device *other, *first = NULL; | |
482 | ||
483 | assert(d); | |
484 | ||
ac155bb8 | 485 | if (startswith(u->id, "sys-")) |
a7f241db LP |
486 | return NULL; |
487 | ||
488 | /* Make everybody follow the unit that's named after the sysfs path */ | |
489 | for (other = d->same_sysfs_next; other; other = other->same_sysfs_next) | |
1124fe6f | 490 | if (startswith(UNIT(other)->id, "sys-")) |
a7f241db LP |
491 | return UNIT(other); |
492 | ||
493 | for (other = d->same_sysfs_prev; other; other = other->same_sysfs_prev) { | |
1124fe6f | 494 | if (startswith(UNIT(other)->id, "sys-")) |
a7f241db LP |
495 | return UNIT(other); |
496 | ||
497 | first = other; | |
498 | } | |
499 | ||
500 | return UNIT(first); | |
501 | } | |
502 | ||
f1421cc6 LP |
503 | static int device_following_set(Unit *u, Set **_set) { |
504 | Device *d = DEVICE(u), *other; | |
505 | Set *set; | |
6210e7fc LP |
506 | int r; |
507 | ||
508 | assert(d); | |
f1421cc6 | 509 | assert(_set); |
6210e7fc | 510 | |
f1421cc6 LP |
511 | if (LIST_JUST_US(same_sysfs, d)) { |
512 | *_set = NULL; | |
6210e7fc LP |
513 | return 0; |
514 | } | |
515 | ||
f1421cc6 LP |
516 | set = set_new(NULL, NULL); |
517 | if (!set) | |
6210e7fc LP |
518 | return -ENOMEM; |
519 | ||
f1421cc6 LP |
520 | LIST_FOREACH_AFTER(same_sysfs, other, d) { |
521 | r = set_put(set, other); | |
522 | if (r < 0) | |
6210e7fc | 523 | goto fail; |
f1421cc6 | 524 | } |
6210e7fc | 525 | |
f1421cc6 LP |
526 | LIST_FOREACH_BEFORE(same_sysfs, other, d) { |
527 | r = set_put(set, other); | |
528 | if (r < 0) | |
6210e7fc | 529 | goto fail; |
f1421cc6 | 530 | } |
6210e7fc | 531 | |
f1421cc6 | 532 | *_set = set; |
6210e7fc LP |
533 | return 1; |
534 | ||
535 | fail: | |
f1421cc6 | 536 | set_free(set); |
6210e7fc LP |
537 | return r; |
538 | } | |
539 | ||
25ac040b LP |
540 | static void device_shutdown(Manager *m) { |
541 | assert(m); | |
542 | ||
718db961 LP |
543 | m->udev_event_source = sd_event_source_unref(m->udev_event_source); |
544 | ||
a16e1123 | 545 | if (m->udev_monitor) { |
f94ea366 | 546 | udev_monitor_unref(m->udev_monitor); |
a16e1123 LP |
547 | m->udev_monitor = NULL; |
548 | } | |
f94ea366 | 549 | |
8fe914ec LP |
550 | hashmap_free(m->devices_by_sysfs); |
551 | m->devices_by_sysfs = NULL; | |
25ac040b LP |
552 | } |
553 | ||
554 | static int device_enumerate(Manager *m) { | |
718db961 | 555 | _cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL; |
25ac040b | 556 | struct udev_list_entry *item = NULL, *first = NULL; |
718db961 | 557 | int r; |
25ac040b LP |
558 | |
559 | assert(m); | |
560 | ||
9670d583 | 561 | if (!m->udev_monitor) { |
718db961 LP |
562 | m->udev_monitor = udev_monitor_new_from_netlink(m->udev, "udev"); |
563 | if (!m->udev_monitor) { | |
a16e1123 LP |
564 | r = -ENOMEM; |
565 | goto fail; | |
566 | } | |
f94ea366 | 567 | |
47ae6e67 LP |
568 | /* This will fail if we are unprivileged, but that |
569 | * should not matter much, as user instances won't run | |
570 | * during boot. */ | |
571 | udev_monitor_set_receive_buffer_size(m->udev_monitor, 128*1024*1024); | |
99448c1f | 572 | |
718db961 LP |
573 | r = udev_monitor_filter_add_match_tag(m->udev_monitor, "systemd"); |
574 | if (r < 0) | |
e1ce2c27 | 575 | goto fail; |
e1ce2c27 | 576 | |
718db961 LP |
577 | r = udev_monitor_enable_receiving(m->udev_monitor); |
578 | if (r < 0) | |
a16e1123 | 579 | goto fail; |
f94ea366 | 580 | |
151b9b96 | 581 | r = sd_event_add_io(m->event, &m->udev_event_source, udev_monitor_get_fd(m->udev_monitor), EPOLLIN, device_dispatch_io, m); |
718db961 LP |
582 | if (r < 0) |
583 | goto fail; | |
a16e1123 | 584 | } |
f94ea366 | 585 | |
718db961 LP |
586 | e = udev_enumerate_new(m->udev); |
587 | if (!e) { | |
4f2d528d LP |
588 | r = -ENOMEM; |
589 | goto fail; | |
590 | } | |
718db961 LP |
591 | |
592 | r = udev_enumerate_add_match_tag(e, "systemd"); | |
593 | if (r < 0) | |
e1ce2c27 | 594 | goto fail; |
25ac040b | 595 | |
e1202047 LP |
596 | r = udev_enumerate_add_match_is_initialized(e); |
597 | if (r < 0) | |
598 | goto fail; | |
599 | ||
718db961 LP |
600 | r = udev_enumerate_scan_devices(e); |
601 | if (r < 0) | |
4f2d528d | 602 | goto fail; |
25ac040b | 603 | |
4f2d528d LP |
604 | first = udev_enumerate_get_list_entry(e); |
605 | udev_list_entry_foreach(item, first) | |
f1421cc6 | 606 | device_process_new_path(m, udev_list_entry_get_name(item)); |
25ac040b | 607 | |
25ac040b LP |
608 | return 0; |
609 | ||
610 | fail: | |
25ac040b LP |
611 | device_shutdown(m); |
612 | return r; | |
5cb5a6ff LP |
613 | } |
614 | ||
718db961 LP |
615 | static int device_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) { |
616 | _cleanup_udev_device_unref_ struct udev_device *dev = NULL; | |
718db961 | 617 | Manager *m = userdata; |
f1421cc6 | 618 | const char *action; |
718db961 | 619 | int r; |
f94ea366 LP |
620 | |
621 | assert(m); | |
99448c1f | 622 | |
718db961 | 623 | if (revents != EPOLLIN) { |
99448c1f KS |
624 | static RATELIMIT_DEFINE(limit, 10*USEC_PER_SEC, 5); |
625 | ||
626 | if (!ratelimit_test(&limit)) | |
627 | log_error("Failed to get udev event: %m"); | |
718db961 LP |
628 | if (!(revents & EPOLLIN)) |
629 | return 0; | |
99448c1f | 630 | } |
f94ea366 | 631 | |
718db961 LP |
632 | /* |
633 | * libudev might filter-out devices which pass the bloom | |
634 | * filter, so getting NULL here is not necessarily an error. | |
635 | */ | |
636 | dev = udev_monitor_receive_device(m->udev_monitor); | |
637 | if (!dev) | |
638 | return 0; | |
f94ea366 | 639 | |
718db961 LP |
640 | action = udev_device_get_action(dev); |
641 | if (!action) { | |
f94ea366 | 642 | log_error("Failed to get udev action string."); |
718db961 | 643 | return 0; |
f94ea366 LP |
644 | } |
645 | ||
f1421cc6 | 646 | if (streq(action, "remove") || !device_is_ready(dev)) { |
718db961 LP |
647 | r = device_process_removed_device(m, dev); |
648 | if (r < 0) | |
f1421cc6 | 649 | log_error("Failed to process device remove event: %s", strerror(-r)); |
9670d583 LP |
650 | |
651 | r = swap_process_removed_device(m, dev); | |
652 | if (r < 0) | |
653 | log_error("Failed to process swap device remove event: %s", strerror(-r)); | |
654 | ||
f94ea366 | 655 | } else { |
f1421cc6 | 656 | r = device_process_new_device(m, dev); |
718db961 | 657 | if (r < 0) |
f1421cc6 LP |
658 | log_error("Failed to process device new event: %s", strerror(-r)); |
659 | ||
9670d583 LP |
660 | r = swap_process_new_device(m, dev); |
661 | if (r < 0) | |
662 | log_error("Failed to process swap device new event: %s", strerror(-r)); | |
663 | ||
f1421cc6 LP |
664 | manager_dispatch_load_queue(m); |
665 | ||
666 | device_set_path_plugged(m, dev); | |
f94ea366 LP |
667 | } |
668 | ||
718db961 | 669 | return 0; |
f94ea366 LP |
670 | } |
671 | ||
a16e1123 LP |
672 | static const char* const device_state_table[_DEVICE_STATE_MAX] = { |
673 | [DEVICE_DEAD] = "dead", | |
73608ed9 | 674 | [DEVICE_PLUGGED] = "plugged" |
a16e1123 LP |
675 | }; |
676 | ||
677 | DEFINE_STRING_TABLE_LOOKUP(device_state, DeviceState); | |
678 | ||
87f0e418 | 679 | const UnitVTable device_vtable = { |
7d17cfbc | 680 | .object_size = sizeof(Device), |
f975e971 LP |
681 | .sections = |
682 | "Unit\0" | |
683 | "Device\0" | |
684 | "Install\0", | |
5cb5a6ff | 685 | |
9e2f7c11 LP |
686 | .no_instances = true, |
687 | ||
faf919f1 | 688 | .init = device_init, |
034c6ed7 | 689 | .done = device_done, |
718db961 LP |
690 | .load = unit_load_fragment_and_dropin_optional, |
691 | ||
f50e0a01 LP |
692 | .coldplug = device_coldplug, |
693 | ||
5cb5a6ff LP |
694 | .dump = device_dump, |
695 | ||
f50e0a01 | 696 | .active_state = device_active_state, |
10a94420 | 697 | .sub_state_to_string = device_sub_state_to_string, |
25ac040b | 698 | |
c4e2ceae | 699 | .bus_interface = "org.freedesktop.systemd1.Device", |
718db961 | 700 | .bus_vtable = bus_device_vtable, |
4139c1b2 | 701 | |
a7f241db | 702 | .following = device_following, |
6210e7fc | 703 | .following_set = device_following_set, |
a7f241db | 704 | |
f50e0a01 | 705 | .enumerate = device_enumerate, |
c6918296 MS |
706 | .shutdown = device_shutdown, |
707 | ||
708 | .status_message_formats = { | |
709 | .starting_stopping = { | |
710 | [0] = "Expecting device %s...", | |
711 | }, | |
712 | .finished_start_job = { | |
713 | [JOB_DONE] = "Found device %s.", | |
714 | [JOB_TIMEOUT] = "Timed out waiting for device %s.", | |
715 | }, | |
716 | }, | |
5cb5a6ff | 717 | }; |