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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 | ||
25ac040b | 26 | #include "log.h" |
9e2f7c11 | 27 | #include "unit-name.h" |
4139c1b2 | 28 | #include "dbus-device.h" |
9eb977db | 29 | #include "path-util.h" |
718db961 | 30 | #include "udev-util.h" |
9670d583 LP |
31 | #include "unit.h" |
32 | #include "swap.h" | |
33 | #include "device.h" | |
5cb5a6ff | 34 | |
f50e0a01 LP |
35 | static const UnitActiveState state_translation_table[_DEVICE_STATE_MAX] = { |
36 | [DEVICE_DEAD] = UNIT_INACTIVE, | |
628c89cc LP |
37 | [DEVICE_TENTATIVE] = UNIT_ACTIVATING, |
38 | [DEVICE_PLUGGED] = UNIT_ACTIVE, | |
f50e0a01 LP |
39 | }; |
40 | ||
718db961 LP |
41 | static int device_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata); |
42 | ||
8fe914ec | 43 | static void device_unset_sysfs(Device *d) { |
f1421cc6 | 44 | Hashmap *devices; |
8fe914ec LP |
45 | Device *first; |
46 | ||
47 | assert(d); | |
48 | ||
a7f241db LP |
49 | if (!d->sysfs) |
50 | return; | |
51 | ||
52 | /* Remove this unit from the chain of devices which share the | |
53 | * same sysfs path. */ | |
f1421cc6 LP |
54 | devices = UNIT(d)->manager->devices_by_sysfs; |
55 | first = hashmap_get(devices, d->sysfs); | |
71fda00f | 56 | LIST_REMOVE(same_sysfs, first, d); |
8fe914ec | 57 | |
a7f241db | 58 | if (first) |
f1421cc6 | 59 | hashmap_remove_and_replace(devices, d->sysfs, first->sysfs, first); |
a7f241db | 60 | else |
f1421cc6 | 61 | hashmap_remove(devices, d->sysfs); |
a7f241db LP |
62 | |
63 | free(d->sysfs); | |
64 | d->sysfs = NULL; | |
8fe914ec LP |
65 | } |
66 | ||
628c89cc LP |
67 | static int device_set_sysfs(Device *d, const char *sysfs) { |
68 | Device *first; | |
69 | char *copy; | |
70 | int r; | |
71 | ||
72 | assert(d); | |
73 | ||
74 | if (streq_ptr(d->sysfs, sysfs)) | |
75 | return 0; | |
76 | ||
77 | r = hashmap_ensure_allocated(&UNIT(d)->manager->devices_by_sysfs, &string_hash_ops); | |
78 | if (r < 0) | |
79 | return r; | |
80 | ||
81 | copy = strdup(sysfs); | |
82 | if (!copy) | |
83 | return -ENOMEM; | |
84 | ||
85 | device_unset_sysfs(d); | |
86 | ||
87 | first = hashmap_get(UNIT(d)->manager->devices_by_sysfs, sysfs); | |
88 | LIST_PREPEND(same_sysfs, first, d); | |
89 | ||
90 | r = hashmap_replace(UNIT(d)->manager->devices_by_sysfs, copy, first); | |
91 | if (r < 0) { | |
92 | LIST_REMOVE(same_sysfs, first, d); | |
93 | free(copy); | |
94 | return r; | |
95 | } | |
96 | ||
97 | d->sysfs = copy; | |
98 | ||
99 | return 0; | |
100 | } | |
101 | ||
faf919f1 LP |
102 | static void device_init(Unit *u) { |
103 | Device *d = DEVICE(u); | |
104 | ||
105 | assert(d); | |
1124fe6f | 106 | assert(UNIT(d)->load_state == UNIT_STUB); |
faf919f1 | 107 | |
8fe914ec LP |
108 | /* In contrast to all other unit types we timeout jobs waiting |
109 | * for devices by default. This is because they otherwise wait | |
35b8ca3a | 110 | * indefinitely for plugged in devices, something which cannot |
8fe914ec LP |
111 | * happen for the other units since their operations time out |
112 | * anyway. */ | |
f1421cc6 | 113 | u->job_timeout = u->manager->default_timeout_start_usec; |
c8f4d764 | 114 | |
f1421cc6 LP |
115 | u->ignore_on_isolate = true; |
116 | u->ignore_on_snapshot = true; | |
faf919f1 LP |
117 | } |
118 | ||
87f0e418 LP |
119 | static void device_done(Unit *u) { |
120 | Device *d = DEVICE(u); | |
034c6ed7 LP |
121 | |
122 | assert(d); | |
e537352b | 123 | |
8fe914ec | 124 | device_unset_sysfs(d); |
e537352b LP |
125 | } |
126 | ||
f50e0a01 LP |
127 | static void device_set_state(Device *d, DeviceState state) { |
128 | DeviceState old_state; | |
129 | assert(d); | |
5cb5a6ff | 130 | |
f50e0a01 LP |
131 | old_state = d->state; |
132 | d->state = state; | |
5cb5a6ff | 133 | |
e537352b | 134 | if (state != old_state) |
79008bdd | 135 | log_unit_debug(UNIT(d)->id, |
66870f90 ZJS |
136 | "%s changed %s -> %s", UNIT(d)->id, |
137 | device_state_to_string(old_state), | |
138 | device_state_to_string(state)); | |
f50e0a01 | 139 | |
e2f3b44c | 140 | unit_notify(UNIT(d), state_translation_table[old_state], state_translation_table[state], true); |
f50e0a01 LP |
141 | } |
142 | ||
be847e82 | 143 | static int device_coldplug(Unit *u) { |
f50e0a01 LP |
144 | Device *d = DEVICE(u); |
145 | ||
146 | assert(d); | |
147 | assert(d->state == DEVICE_DEAD); | |
148 | ||
628c89cc LP |
149 | if (d->found & DEVICE_FOUND_UDEV) |
150 | /* If udev says the device is around, it's around */ | |
73608ed9 | 151 | device_set_state(d, DEVICE_PLUGGED); |
f6200941 | 152 | else if (d->found != DEVICE_NOT_FOUND && d->deserialized_state != DEVICE_PLUGGED) |
628c89cc | 153 | /* If a device is found in /proc/self/mountinfo or |
f6200941 LP |
154 | * /proc/swaps, and was not yet announced via udev, |
155 | * it's "tentatively" around. */ | |
628c89cc | 156 | device_set_state(d, DEVICE_TENTATIVE); |
f50e0a01 LP |
157 | |
158 | return 0; | |
159 | } | |
160 | ||
f6200941 LP |
161 | static int device_serialize(Unit *u, FILE *f, FDSet *fds) { |
162 | Device *d = DEVICE(u); | |
163 | ||
164 | assert(u); | |
165 | assert(f); | |
166 | assert(fds); | |
167 | ||
168 | unit_serialize_item(u, f, "state", device_state_to_string(d->state)); | |
0108f6ec DM |
169 | |
170 | return 0; | |
f6200941 LP |
171 | } |
172 | ||
173 | static int device_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
174 | Device *d = DEVICE(u); | |
175 | ||
176 | assert(u); | |
177 | assert(key); | |
178 | assert(value); | |
179 | assert(fds); | |
180 | ||
181 | if (streq(key, "state")) { | |
182 | DeviceState state; | |
183 | ||
184 | state = device_state_from_string(value); | |
185 | if (state < 0) | |
186 | log_unit_debug(u->id, "Failed to parse state value %s", value); | |
187 | else | |
188 | d->deserialized_state = state; | |
189 | } else | |
190 | log_unit_debug(u->id, "Unknown serialization key '%s'", key); | |
191 | ||
192 | return 0; | |
193 | } | |
194 | ||
f50e0a01 | 195 | static void device_dump(Unit *u, FILE *f, const char *prefix) { |
25ac040b | 196 | Device *d = DEVICE(u); |
5cb5a6ff | 197 | |
25ac040b | 198 | assert(d); |
5cb5a6ff LP |
199 | |
200 | fprintf(f, | |
25ac040b LP |
201 | "%sDevice State: %s\n" |
202 | "%sSysfs Path: %s\n", | |
a16e1123 | 203 | prefix, device_state_to_string(d->state), |
f50e0a01 LP |
204 | prefix, strna(d->sysfs)); |
205 | } | |
206 | ||
44a6b1b6 | 207 | _pure_ static UnitActiveState device_active_state(Unit *u) { |
f50e0a01 LP |
208 | assert(u); |
209 | ||
210 | return state_translation_table[DEVICE(u)->state]; | |
25ac040b LP |
211 | } |
212 | ||
44a6b1b6 | 213 | _pure_ static const char *device_sub_state_to_string(Unit *u) { |
10a94420 LP |
214 | assert(u); |
215 | ||
a16e1123 | 216 | return device_state_to_string(DEVICE(u)->state); |
10a94420 LP |
217 | } |
218 | ||
628c89cc | 219 | static int device_update_description(Unit *u, struct udev_device *dev, const char *path) { |
965e5c5d | 220 | const char *model; |
628c89cc | 221 | int r; |
965e5c5d LP |
222 | |
223 | assert(u); | |
224 | assert(dev); | |
225 | assert(path); | |
226 | ||
227 | model = udev_device_get_property_value(dev, "ID_MODEL_FROM_DATABASE"); | |
228 | if (!model) | |
229 | model = udev_device_get_property_value(dev, "ID_MODEL"); | |
230 | ||
231 | if (model) { | |
232 | const char *label; | |
233 | ||
234 | /* Try to concatenate the device model string with a label, if there is one */ | |
235 | label = udev_device_get_property_value(dev, "ID_FS_LABEL"); | |
236 | if (!label) | |
237 | label = udev_device_get_property_value(dev, "ID_PART_ENTRY_NAME"); | |
238 | if (!label) | |
239 | label = udev_device_get_property_value(dev, "ID_PART_ENTRY_NUMBER"); | |
240 | ||
241 | if (label) { | |
242 | _cleanup_free_ char *j; | |
243 | ||
244 | j = strjoin(model, " ", label, NULL); | |
245 | if (j) | |
628c89cc | 246 | r = unit_set_description(u, j); |
c43b2132 TA |
247 | else |
248 | r = -ENOMEM; | |
628c89cc LP |
249 | } else |
250 | r = unit_set_description(u, model); | |
251 | } else | |
252 | r = unit_set_description(u, path); | |
965e5c5d | 253 | |
628c89cc LP |
254 | if (r < 0) |
255 | log_unit_error_errno(u->id, r, "Failed to set device description: %m"); | |
965e5c5d | 256 | |
628c89cc | 257 | return r; |
965e5c5d LP |
258 | } |
259 | ||
260 | static int device_add_udev_wants(Unit *u, struct udev_device *dev) { | |
261 | const char *wants; | |
a2a5291b | 262 | const char *word, *state; |
965e5c5d LP |
263 | size_t l; |
264 | int r; | |
b2fadec6 | 265 | const char *property; |
965e5c5d LP |
266 | |
267 | assert(u); | |
268 | assert(dev); | |
269 | ||
b2fadec6 ZJS |
270 | property = u->manager->running_as == SYSTEMD_USER ? "SYSTEMD_USER_WANTS" : "SYSTEMD_WANTS"; |
271 | wants = udev_device_get_property_value(dev, property); | |
965e5c5d LP |
272 | if (!wants) |
273 | return 0; | |
274 | ||
a2a5291b | 275 | FOREACH_WORD_QUOTED(word, l, wants, state) { |
965e5c5d LP |
276 | _cleanup_free_ char *n = NULL; |
277 | char e[l+1]; | |
278 | ||
a2a5291b | 279 | memcpy(e, word, l); |
965e5c5d LP |
280 | e[l] = 0; |
281 | ||
282 | n = unit_name_mangle(e, MANGLE_NOGLOB); | |
283 | if (!n) | |
628c89cc | 284 | return log_oom(); |
965e5c5d LP |
285 | |
286 | r = unit_add_dependency_by_name(u, UNIT_WANTS, n, NULL, true); | |
287 | if (r < 0) | |
628c89cc | 288 | return log_unit_error_errno(u->id, r, "Failed to add wants dependency: %m"); |
965e5c5d | 289 | } |
b2fadec6 | 290 | if (!isempty(state)) |
628c89cc | 291 | log_unit_warning(u->id, "Property %s on %s has trailing garbage, ignoring.", property, strna(udev_device_get_syspath(dev))); |
965e5c5d LP |
292 | |
293 | return 0; | |
294 | } | |
295 | ||
628c89cc LP |
296 | static int device_setup_unit(Manager *m, struct udev_device *dev, const char *path, bool main) { |
297 | _cleanup_free_ char *e = NULL; | |
965e5c5d | 298 | const char *sysfs; |
25ac040b | 299 | Unit *u = NULL; |
25ac040b | 300 | bool delete; |
965e5c5d | 301 | int r; |
25ac040b LP |
302 | |
303 | assert(m); | |
965e5c5d LP |
304 | assert(dev); |
305 | assert(path); | |
25ac040b | 306 | |
b47d419c ZJS |
307 | sysfs = udev_device_get_syspath(dev); |
308 | if (!sysfs) | |
f1421cc6 | 309 | return 0; |
7f275a9f | 310 | |
628c89cc LP |
311 | e = unit_name_from_path(path, ".device"); |
312 | if (!e) | |
313 | return log_oom(); | |
314 | ||
315 | u = manager_get_unit(m, e); | |
25ac040b | 316 | |
628c89cc LP |
317 | if (u && |
318 | DEVICE(u)->sysfs && | |
319 | !path_equal(DEVICE(u)->sysfs, sysfs)) { | |
5259bcf6 | 320 | log_unit_debug(u->id, "Device %s appeared twice with different sysfs paths %s and %s", e, DEVICE(u)->sysfs, sysfs); |
8fe914ec | 321 | return -EEXIST; |
628c89cc | 322 | } |
25ac040b | 323 | |
aab14b13 LP |
324 | if (!u) { |
325 | delete = true; | |
326 | ||
7d17cfbc MS |
327 | u = unit_new(m, sizeof(Device)); |
328 | if (!u) | |
f1421cc6 | 329 | return log_oom(); |
25ac040b | 330 | |
628c89cc | 331 | r = unit_add_name(u, e); |
7d17cfbc | 332 | if (r < 0) |
25ac040b LP |
333 | goto fail; |
334 | ||
ee6cb288 LP |
335 | unit_add_to_load_queue(u); |
336 | } else | |
337 | delete = false; | |
338 | ||
339 | /* If this was created via some dependency and has not | |
340 | * actually been seen yet ->sysfs will not be | |
341 | * initialized. Hence initialize it if necessary. */ | |
342 | ||
628c89cc LP |
343 | r = device_set_sysfs(DEVICE(u), sysfs); |
344 | if (r < 0) | |
345 | goto fail; | |
aab14b13 | 346 | |
628c89cc | 347 | (void) device_update_description(u, dev, path); |
25ac040b | 348 | |
628c89cc LP |
349 | /* The additional systemd udev properties we only interpret |
350 | * for the main object */ | |
351 | if (main) | |
352 | (void) device_add_udev_wants(u, dev); | |
f94ea366 | 353 | |
f1421cc6 LP |
354 | /* Note that this won't dispatch the load queue, the caller |
355 | * has to do that if needed and appropriate */ | |
356 | ||
c1e1601e | 357 | unit_add_to_dbus_queue(u); |
25ac040b LP |
358 | return 0; |
359 | ||
360 | fail: | |
628c89cc | 361 | log_unit_warning_errno(u->id, r, "Failed to set up device unit: %m"); |
ee5f3479 | 362 | |
2bb9e620 | 363 | if (delete) |
25ac040b | 364 | unit_free(u); |
ee5f3479 | 365 | |
25ac040b LP |
366 | return r; |
367 | } | |
368 | ||
628c89cc | 369 | static int device_process_new(Manager *m, struct udev_device *dev) { |
f1421cc6 | 370 | const char *sysfs, *dn, *alias; |
8fe914ec | 371 | struct udev_list_entry *item = NULL, *first = NULL; |
003ac9d0 | 372 | int r; |
8fe914ec LP |
373 | |
374 | assert(m); | |
375 | ||
718db961 LP |
376 | sysfs = udev_device_get_syspath(dev); |
377 | if (!sysfs) | |
f1421cc6 | 378 | return 0; |
8fe914ec LP |
379 | |
380 | /* Add the main unit named after the sysfs path */ | |
628c89cc | 381 | r = device_setup_unit(m, dev, sysfs, true); |
003ac9d0 HH |
382 | if (r < 0) |
383 | return r; | |
8fe914ec LP |
384 | |
385 | /* Add an additional unit for the device node */ | |
f1421cc6 LP |
386 | dn = udev_device_get_devnode(dev); |
387 | if (dn) | |
628c89cc | 388 | (void) device_setup_unit(m, dev, dn, false); |
8fe914ec LP |
389 | |
390 | /* Add additional units for all symlinks */ | |
391 | first = udev_device_get_devlinks_list_entry(dev); | |
392 | udev_list_entry_foreach(item, first) { | |
393 | const char *p; | |
5845b46b | 394 | struct stat st; |
8fe914ec LP |
395 | |
396 | /* Don't bother with the /dev/block links */ | |
397 | p = udev_list_entry_get_name(item); | |
398 | ||
399 | if (path_startswith(p, "/dev/block/") || | |
400 | path_startswith(p, "/dev/char/")) | |
401 | continue; | |
402 | ||
5845b46b LP |
403 | /* Verify that the symlink in the FS actually belongs |
404 | * to this device. This is useful to deal with | |
405 | * conflicting devices, e.g. when two disks want the | |
406 | * same /dev/disk/by-label/xxx link because they have | |
407 | * the same label. We want to make sure that the same | |
408 | * device that won the symlink wins in systemd, so we | |
ee33e53a | 409 | * check the device node major/minor */ |
5845b46b LP |
410 | if (stat(p, &st) >= 0) |
411 | if ((!S_ISBLK(st.st_mode) && !S_ISCHR(st.st_mode)) || | |
412 | st.st_rdev != udev_device_get_devnum(dev)) | |
413 | continue; | |
414 | ||
628c89cc | 415 | (void) device_setup_unit(m, dev, p, false); |
8fe914ec LP |
416 | } |
417 | ||
f1421cc6 LP |
418 | /* Add additional units for all explicitly configured |
419 | * aliases */ | |
420 | alias = udev_device_get_property_value(dev, "SYSTEMD_ALIAS"); | |
421 | if (alias) { | |
a2a5291b | 422 | const char *word, *state; |
f1421cc6 | 423 | size_t l; |
8fe914ec | 424 | |
a2a5291b | 425 | FOREACH_WORD_QUOTED(word, l, alias, state) { |
f1421cc6 | 426 | char e[l+1]; |
8fe914ec | 427 | |
a2a5291b | 428 | memcpy(e, word, l); |
f1421cc6 LP |
429 | e[l] = 0; |
430 | ||
431 | if (path_is_absolute(e)) | |
628c89cc | 432 | (void) device_setup_unit(m, dev, e, false); |
f1421cc6 LP |
433 | else |
434 | log_warning("SYSTEMD_ALIAS for %s is not an absolute path, ignoring: %s", sysfs, e); | |
435 | } | |
b2fadec6 ZJS |
436 | if (!isempty(state)) |
437 | log_warning("SYSTEMD_ALIAS for %s has trailing garbage, ignoring.", sysfs); | |
8fe914ec LP |
438 | } |
439 | ||
440 | return 0; | |
441 | } | |
442 | ||
628c89cc | 443 | static void device_update_found_one(Device *d, bool add, DeviceFound found, bool now) { |
f6200941 | 444 | DeviceFound n, previous; |
628c89cc LP |
445 | |
446 | assert(d); | |
447 | ||
448 | n = add ? (d->found | found) : (d->found & ~found); | |
449 | if (n == d->found) | |
450 | return; | |
451 | ||
f6200941 | 452 | previous = d->found; |
628c89cc LP |
453 | d->found = n; |
454 | ||
f6200941 LP |
455 | if (!now) |
456 | return; | |
457 | ||
458 | if (d->found & DEVICE_FOUND_UDEV) | |
459 | /* When the device is known to udev we consider it | |
460 | * plugged. */ | |
461 | device_set_state(d, DEVICE_PLUGGED); | |
462 | else if (d->found != DEVICE_NOT_FOUND && (previous & DEVICE_FOUND_UDEV) == 0) | |
463 | /* If the device has not been seen by udev yet, but is | |
464 | * now referenced by the kernel, then we assume the | |
465 | * kernel knows it now, and udev might soon too. */ | |
466 | device_set_state(d, DEVICE_TENTATIVE); | |
467 | else | |
468 | /* If nobody sees the device, or if the device was | |
469 | * previously seen by udev and now is only referenced | |
470 | * from the kernel, then we consider the device is | |
471 | * gone, the kernel just hasn't noticed it yet. */ | |
472 | device_set_state(d, DEVICE_DEAD); | |
628c89cc LP |
473 | } |
474 | ||
475 | static int device_update_found_by_sysfs(Manager *m, const char *sysfs, bool add, DeviceFound found, bool now) { | |
f1421cc6 | 476 | Device *d, *l; |
25ac040b LP |
477 | |
478 | assert(m); | |
628c89cc | 479 | assert(sysfs); |
25ac040b | 480 | |
628c89cc LP |
481 | if (found == DEVICE_NOT_FOUND) |
482 | return 0; | |
25ac040b | 483 | |
f1421cc6 LP |
484 | l = hashmap_get(m->devices_by_sysfs, sysfs); |
485 | LIST_FOREACH(same_sysfs, d, l) | |
628c89cc LP |
486 | device_update_found_one(d, add, found, now); |
487 | ||
488 | return 0; | |
25ac040b LP |
489 | } |
490 | ||
628c89cc LP |
491 | static int device_update_found_by_name(Manager *m, const char *path, bool add, DeviceFound found, bool now) { |
492 | _cleanup_free_ char *e = NULL; | |
493 | Unit *u; | |
f94ea366 LP |
494 | |
495 | assert(m); | |
628c89cc | 496 | assert(path); |
f94ea366 | 497 | |
628c89cc LP |
498 | if (found == DEVICE_NOT_FOUND) |
499 | return 0; | |
f94ea366 | 500 | |
628c89cc LP |
501 | e = unit_name_from_path(path, ".device"); |
502 | if (!e) | |
503 | return log_oom(); | |
f94ea366 | 504 | |
628c89cc LP |
505 | u = manager_get_unit(m, e); |
506 | if (!u) | |
507 | return 0; | |
508 | ||
509 | device_update_found_one(DEVICE(u), add, found, now); | |
f94ea366 LP |
510 | return 0; |
511 | } | |
512 | ||
f1421cc6 LP |
513 | static bool device_is_ready(struct udev_device *dev) { |
514 | const char *ready; | |
515 | ||
516 | assert(dev); | |
517 | ||
518 | ready = udev_device_get_property_value(dev, "SYSTEMD_READY"); | |
519 | if (!ready) | |
520 | return true; | |
521 | ||
522 | return parse_boolean(ready) != 0; | |
523 | } | |
524 | ||
a7f241db LP |
525 | static Unit *device_following(Unit *u) { |
526 | Device *d = DEVICE(u); | |
527 | Device *other, *first = NULL; | |
528 | ||
529 | assert(d); | |
530 | ||
ac155bb8 | 531 | if (startswith(u->id, "sys-")) |
a7f241db LP |
532 | return NULL; |
533 | ||
534 | /* Make everybody follow the unit that's named after the sysfs path */ | |
535 | for (other = d->same_sysfs_next; other; other = other->same_sysfs_next) | |
1124fe6f | 536 | if (startswith(UNIT(other)->id, "sys-")) |
a7f241db LP |
537 | return UNIT(other); |
538 | ||
539 | for (other = d->same_sysfs_prev; other; other = other->same_sysfs_prev) { | |
1124fe6f | 540 | if (startswith(UNIT(other)->id, "sys-")) |
a7f241db LP |
541 | return UNIT(other); |
542 | ||
543 | first = other; | |
544 | } | |
545 | ||
546 | return UNIT(first); | |
547 | } | |
548 | ||
f1421cc6 LP |
549 | static int device_following_set(Unit *u, Set **_set) { |
550 | Device *d = DEVICE(u), *other; | |
551 | Set *set; | |
6210e7fc LP |
552 | int r; |
553 | ||
554 | assert(d); | |
f1421cc6 | 555 | assert(_set); |
6210e7fc | 556 | |
f1421cc6 LP |
557 | if (LIST_JUST_US(same_sysfs, d)) { |
558 | *_set = NULL; | |
6210e7fc LP |
559 | return 0; |
560 | } | |
561 | ||
d5099efc | 562 | set = set_new(NULL); |
f1421cc6 | 563 | if (!set) |
6210e7fc LP |
564 | return -ENOMEM; |
565 | ||
f1421cc6 LP |
566 | LIST_FOREACH_AFTER(same_sysfs, other, d) { |
567 | r = set_put(set, other); | |
568 | if (r < 0) | |
6210e7fc | 569 | goto fail; |
f1421cc6 | 570 | } |
6210e7fc | 571 | |
f1421cc6 LP |
572 | LIST_FOREACH_BEFORE(same_sysfs, other, d) { |
573 | r = set_put(set, other); | |
574 | if (r < 0) | |
6210e7fc | 575 | goto fail; |
f1421cc6 | 576 | } |
6210e7fc | 577 | |
f1421cc6 | 578 | *_set = set; |
6210e7fc LP |
579 | return 1; |
580 | ||
581 | fail: | |
f1421cc6 | 582 | set_free(set); |
6210e7fc LP |
583 | return r; |
584 | } | |
585 | ||
25ac040b LP |
586 | static void device_shutdown(Manager *m) { |
587 | assert(m); | |
588 | ||
718db961 LP |
589 | m->udev_event_source = sd_event_source_unref(m->udev_event_source); |
590 | ||
a16e1123 | 591 | if (m->udev_monitor) { |
f94ea366 | 592 | udev_monitor_unref(m->udev_monitor); |
a16e1123 LP |
593 | m->udev_monitor = NULL; |
594 | } | |
f94ea366 | 595 | |
8fe914ec LP |
596 | hashmap_free(m->devices_by_sysfs); |
597 | m->devices_by_sysfs = NULL; | |
25ac040b LP |
598 | } |
599 | ||
600 | static int device_enumerate(Manager *m) { | |
718db961 | 601 | _cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL; |
25ac040b | 602 | struct udev_list_entry *item = NULL, *first = NULL; |
718db961 | 603 | int r; |
25ac040b LP |
604 | |
605 | assert(m); | |
606 | ||
9670d583 | 607 | if (!m->udev_monitor) { |
718db961 LP |
608 | m->udev_monitor = udev_monitor_new_from_netlink(m->udev, "udev"); |
609 | if (!m->udev_monitor) { | |
a16e1123 LP |
610 | r = -ENOMEM; |
611 | goto fail; | |
612 | } | |
f94ea366 | 613 | |
47ae6e67 LP |
614 | /* This will fail if we are unprivileged, but that |
615 | * should not matter much, as user instances won't run | |
616 | * during boot. */ | |
8fa158e7 | 617 | (void) udev_monitor_set_receive_buffer_size(m->udev_monitor, 128*1024*1024); |
99448c1f | 618 | |
718db961 LP |
619 | r = udev_monitor_filter_add_match_tag(m->udev_monitor, "systemd"); |
620 | if (r < 0) | |
e1ce2c27 | 621 | goto fail; |
e1ce2c27 | 622 | |
718db961 LP |
623 | r = udev_monitor_enable_receiving(m->udev_monitor); |
624 | if (r < 0) | |
a16e1123 | 625 | goto fail; |
f94ea366 | 626 | |
151b9b96 | 627 | 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 |
628 | if (r < 0) |
629 | goto fail; | |
7dfbe2e3 TG |
630 | |
631 | (void) sd_event_source_set_description(m->udev_event_source, "device"); | |
a16e1123 | 632 | } |
f94ea366 | 633 | |
718db961 LP |
634 | e = udev_enumerate_new(m->udev); |
635 | if (!e) { | |
4f2d528d LP |
636 | r = -ENOMEM; |
637 | goto fail; | |
638 | } | |
718db961 LP |
639 | |
640 | r = udev_enumerate_add_match_tag(e, "systemd"); | |
641 | if (r < 0) | |
e1ce2c27 | 642 | goto fail; |
25ac040b | 643 | |
e1202047 LP |
644 | r = udev_enumerate_add_match_is_initialized(e); |
645 | if (r < 0) | |
646 | goto fail; | |
647 | ||
718db961 LP |
648 | r = udev_enumerate_scan_devices(e); |
649 | if (r < 0) | |
4f2d528d | 650 | goto fail; |
25ac040b | 651 | |
4f2d528d | 652 | first = udev_enumerate_get_list_entry(e); |
628c89cc LP |
653 | udev_list_entry_foreach(item, first) { |
654 | _cleanup_udev_device_unref_ struct udev_device *dev = NULL; | |
655 | const char *sysfs; | |
656 | ||
657 | sysfs = udev_list_entry_get_name(item); | |
658 | ||
659 | dev = udev_device_new_from_syspath(m->udev, sysfs); | |
660 | if (!dev) { | |
661 | log_oom(); | |
662 | continue; | |
663 | } | |
664 | ||
665 | if (!device_is_ready(dev)) | |
666 | continue; | |
667 | ||
668 | (void) device_process_new(m, dev); | |
669 | ||
670 | device_update_found_by_sysfs(m, sysfs, true, DEVICE_FOUND_UDEV, false); | |
671 | } | |
25ac040b | 672 | |
25ac040b LP |
673 | return 0; |
674 | ||
675 | fail: | |
628c89cc LP |
676 | log_error_errno(r, "Failed to enumerate devices: %m"); |
677 | ||
25ac040b LP |
678 | device_shutdown(m); |
679 | return r; | |
5cb5a6ff LP |
680 | } |
681 | ||
718db961 LP |
682 | static int device_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) { |
683 | _cleanup_udev_device_unref_ struct udev_device *dev = NULL; | |
718db961 | 684 | Manager *m = userdata; |
628c89cc | 685 | const char *action, *sysfs; |
718db961 | 686 | int r; |
f94ea366 LP |
687 | |
688 | assert(m); | |
99448c1f | 689 | |
718db961 | 690 | if (revents != EPOLLIN) { |
99448c1f KS |
691 | static RATELIMIT_DEFINE(limit, 10*USEC_PER_SEC, 5); |
692 | ||
693 | if (!ratelimit_test(&limit)) | |
56f64d95 | 694 | log_error_errno(errno, "Failed to get udev event: %m"); |
718db961 LP |
695 | if (!(revents & EPOLLIN)) |
696 | return 0; | |
99448c1f | 697 | } |
f94ea366 | 698 | |
718db961 LP |
699 | /* |
700 | * libudev might filter-out devices which pass the bloom | |
701 | * filter, so getting NULL here is not necessarily an error. | |
702 | */ | |
703 | dev = udev_monitor_receive_device(m->udev_monitor); | |
704 | if (!dev) | |
705 | return 0; | |
f94ea366 | 706 | |
628c89cc LP |
707 | sysfs = udev_device_get_syspath(dev); |
708 | if (!sysfs) { | |
709 | log_error("Failed to get udev sys path."); | |
710 | return 0; | |
711 | } | |
712 | ||
718db961 LP |
713 | action = udev_device_get_action(dev); |
714 | if (!action) { | |
f94ea366 | 715 | log_error("Failed to get udev action string."); |
718db961 | 716 | return 0; |
f94ea366 LP |
717 | } |
718 | ||
628c89cc LP |
719 | if (streq(action, "remove")) { |
720 | r = swap_process_device_remove(m, dev); | |
9670d583 | 721 | if (r < 0) |
da927ba9 | 722 | log_error_errno(r, "Failed to process swap device remove event: %m"); |
9670d583 | 723 | |
628c89cc LP |
724 | /* If we get notified that a device was removed by |
725 | * udev, then it's completely gone, hence unset all | |
726 | * found bits */ | |
727 | device_update_found_by_sysfs(m, sysfs, false, DEVICE_FOUND_UDEV|DEVICE_FOUND_MOUNT|DEVICE_FOUND_SWAP, true); | |
f1421cc6 | 728 | |
628c89cc LP |
729 | } else if (device_is_ready(dev)) { |
730 | ||
731 | (void) device_process_new(m, dev); | |
732 | ||
733 | r = swap_process_device_new(m, dev); | |
9670d583 | 734 | if (r < 0) |
da927ba9 | 735 | log_error_errno(r, "Failed to process swap device new event: %m"); |
9670d583 | 736 | |
f1421cc6 LP |
737 | manager_dispatch_load_queue(m); |
738 | ||
628c89cc LP |
739 | /* The device is found now, set the udev found bit */ |
740 | device_update_found_by_sysfs(m, sysfs, true, DEVICE_FOUND_UDEV, true); | |
741 | ||
742 | } else { | |
743 | /* The device is nominally around, but not ready for | |
744 | * us. Hence unset the udev bit, but leave the rest | |
745 | * around. */ | |
746 | ||
747 | device_update_found_by_sysfs(m, sysfs, false, DEVICE_FOUND_UDEV, true); | |
f94ea366 LP |
748 | } |
749 | ||
718db961 | 750 | return 0; |
f94ea366 LP |
751 | } |
752 | ||
0faacd47 LP |
753 | static bool device_supported(Manager *m) { |
754 | static int read_only = -1; | |
755 | assert(m); | |
756 | ||
757 | /* If /sys is read-only we don't support device units, and any | |
758 | * attempts to start one should fail immediately. */ | |
759 | ||
760 | if (read_only < 0) | |
761 | read_only = path_is_read_only_fs("/sys"); | |
762 | ||
763 | return read_only <= 0; | |
764 | } | |
765 | ||
628c89cc LP |
766 | int device_found_node(Manager *m, const char *node, bool add, DeviceFound found, bool now) { |
767 | _cleanup_udev_device_unref_ struct udev_device *dev = NULL; | |
768 | struct stat st; | |
769 | ||
770 | assert(m); | |
771 | assert(node); | |
772 | ||
773 | /* This is called whenever we find a device referenced in | |
774 | * /proc/swaps or /proc/self/mounts. Such a device might be | |
775 | * mounted/enabled at a time where udev has not finished | |
776 | * probing it yet, and we thus haven't learned about it | |
777 | * yet. In this case we will set the device unit to | |
778 | * "tentative" state. */ | |
779 | ||
780 | if (add) { | |
781 | if (!path_startswith(node, "/dev")) | |
782 | return 0; | |
783 | ||
f6200941 LP |
784 | /* We make an extra check here, if the device node |
785 | * actually exists. If it's missing, then this is an | |
786 | * indication that device was unplugged but is still | |
787 | * referenced in /proc/swaps or | |
788 | * /proc/self/mountinfo. Note that this check doesn't | |
789 | * really cover all cases where a device might be gone | |
790 | * away, since drives that can have a medium inserted | |
791 | * will still have a device node even when the medium | |
792 | * is not there... */ | |
793 | ||
628c89cc LP |
794 | if (stat(node, &st) < 0) { |
795 | if (errno == ENOENT) | |
796 | return 0; | |
797 | ||
798 | return log_error_errno(errno, "Failed to stat device node file %s: %m", node); | |
799 | } | |
800 | ||
801 | if (!S_ISBLK(st.st_mode) && !S_ISCHR(st.st_mode)) | |
802 | return 0; | |
803 | ||
804 | dev = udev_device_new_from_devnum(m->udev, S_ISBLK(st.st_mode) ? 'b' : 'c', st.st_rdev); | |
805 | if (!dev) { | |
806 | if (errno == ENOENT) | |
807 | return 0; | |
808 | ||
809 | return log_oom(); | |
810 | } | |
811 | ||
812 | /* If the device is known in the kernel and newly | |
813 | * appeared, then we'll create a device unit for it, | |
814 | * under the name referenced in /proc/swaps or | |
815 | * /proc/self/mountinfo. */ | |
816 | ||
817 | (void) device_setup_unit(m, dev, node, false); | |
818 | } | |
819 | ||
820 | /* Update the device unit's state, should it exist */ | |
821 | return device_update_found_by_name(m, node, add, found, now); | |
822 | } | |
823 | ||
a16e1123 LP |
824 | static const char* const device_state_table[_DEVICE_STATE_MAX] = { |
825 | [DEVICE_DEAD] = "dead", | |
628c89cc LP |
826 | [DEVICE_TENTATIVE] = "tentative", |
827 | [DEVICE_PLUGGED] = "plugged", | |
a16e1123 LP |
828 | }; |
829 | ||
830 | DEFINE_STRING_TABLE_LOOKUP(device_state, DeviceState); | |
831 | ||
87f0e418 | 832 | const UnitVTable device_vtable = { |
7d17cfbc | 833 | .object_size = sizeof(Device), |
f975e971 LP |
834 | .sections = |
835 | "Unit\0" | |
836 | "Device\0" | |
837 | "Install\0", | |
5cb5a6ff | 838 | |
9e2f7c11 LP |
839 | .no_instances = true, |
840 | ||
faf919f1 | 841 | .init = device_init, |
034c6ed7 | 842 | .done = device_done, |
718db961 LP |
843 | .load = unit_load_fragment_and_dropin_optional, |
844 | ||
f50e0a01 LP |
845 | .coldplug = device_coldplug, |
846 | ||
f6200941 LP |
847 | .serialize = device_serialize, |
848 | .deserialize_item = device_deserialize_item, | |
849 | ||
5cb5a6ff LP |
850 | .dump = device_dump, |
851 | ||
f50e0a01 | 852 | .active_state = device_active_state, |
10a94420 | 853 | .sub_state_to_string = device_sub_state_to_string, |
25ac040b | 854 | |
c4e2ceae | 855 | .bus_interface = "org.freedesktop.systemd1.Device", |
718db961 | 856 | .bus_vtable = bus_device_vtable, |
4139c1b2 | 857 | |
a7f241db | 858 | .following = device_following, |
6210e7fc | 859 | .following_set = device_following_set, |
a7f241db | 860 | |
f50e0a01 | 861 | .enumerate = device_enumerate, |
c6918296 | 862 | .shutdown = device_shutdown, |
0faacd47 | 863 | .supported = device_supported, |
c6918296 MS |
864 | |
865 | .status_message_formats = { | |
866 | .starting_stopping = { | |
867 | [0] = "Expecting device %s...", | |
868 | }, | |
869 | .finished_start_job = { | |
870 | [JOB_DONE] = "Found device %s.", | |
871 | [JOB_TIMEOUT] = "Timed out waiting for device %s.", | |
872 | }, | |
873 | }, | |
5cb5a6ff | 874 | }; |