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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) |
f2341e0a | 135 | log_unit_debug(UNIT(d), "Changed %s -> %s", device_state_to_string(old_state), device_state_to_string(state)); |
f50e0a01 | 136 | |
e2f3b44c | 137 | unit_notify(UNIT(d), state_translation_table[old_state], state_translation_table[state], true); |
f50e0a01 LP |
138 | } |
139 | ||
be847e82 | 140 | static int device_coldplug(Unit *u) { |
f50e0a01 LP |
141 | Device *d = DEVICE(u); |
142 | ||
143 | assert(d); | |
144 | assert(d->state == DEVICE_DEAD); | |
145 | ||
628c89cc LP |
146 | if (d->found & DEVICE_FOUND_UDEV) |
147 | /* If udev says the device is around, it's around */ | |
73608ed9 | 148 | device_set_state(d, DEVICE_PLUGGED); |
f6200941 | 149 | else if (d->found != DEVICE_NOT_FOUND && d->deserialized_state != DEVICE_PLUGGED) |
628c89cc | 150 | /* If a device is found in /proc/self/mountinfo or |
f6200941 LP |
151 | * /proc/swaps, and was not yet announced via udev, |
152 | * it's "tentatively" around. */ | |
628c89cc | 153 | device_set_state(d, DEVICE_TENTATIVE); |
f50e0a01 LP |
154 | |
155 | return 0; | |
156 | } | |
157 | ||
f6200941 LP |
158 | static int device_serialize(Unit *u, FILE *f, FDSet *fds) { |
159 | Device *d = DEVICE(u); | |
160 | ||
161 | assert(u); | |
162 | assert(f); | |
163 | assert(fds); | |
164 | ||
165 | unit_serialize_item(u, f, "state", device_state_to_string(d->state)); | |
0108f6ec DM |
166 | |
167 | return 0; | |
f6200941 LP |
168 | } |
169 | ||
170 | static int device_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
171 | Device *d = DEVICE(u); | |
172 | ||
173 | assert(u); | |
174 | assert(key); | |
175 | assert(value); | |
176 | assert(fds); | |
177 | ||
178 | if (streq(key, "state")) { | |
179 | DeviceState state; | |
180 | ||
181 | state = device_state_from_string(value); | |
182 | if (state < 0) | |
f2341e0a | 183 | log_unit_debug(u, "Failed to parse state value: %s", value); |
f6200941 LP |
184 | else |
185 | d->deserialized_state = state; | |
186 | } else | |
f2341e0a | 187 | log_unit_debug(u, "Unknown serialization key: %s", key); |
f6200941 LP |
188 | |
189 | return 0; | |
190 | } | |
191 | ||
f50e0a01 | 192 | static void device_dump(Unit *u, FILE *f, const char *prefix) { |
25ac040b | 193 | Device *d = DEVICE(u); |
5cb5a6ff | 194 | |
25ac040b | 195 | assert(d); |
5cb5a6ff LP |
196 | |
197 | fprintf(f, | |
25ac040b LP |
198 | "%sDevice State: %s\n" |
199 | "%sSysfs Path: %s\n", | |
a16e1123 | 200 | prefix, device_state_to_string(d->state), |
f50e0a01 LP |
201 | prefix, strna(d->sysfs)); |
202 | } | |
203 | ||
44a6b1b6 | 204 | _pure_ static UnitActiveState device_active_state(Unit *u) { |
f50e0a01 LP |
205 | assert(u); |
206 | ||
207 | return state_translation_table[DEVICE(u)->state]; | |
25ac040b LP |
208 | } |
209 | ||
44a6b1b6 | 210 | _pure_ static const char *device_sub_state_to_string(Unit *u) { |
10a94420 LP |
211 | assert(u); |
212 | ||
a16e1123 | 213 | return device_state_to_string(DEVICE(u)->state); |
10a94420 LP |
214 | } |
215 | ||
628c89cc | 216 | static int device_update_description(Unit *u, struct udev_device *dev, const char *path) { |
965e5c5d | 217 | const char *model; |
628c89cc | 218 | int r; |
965e5c5d LP |
219 | |
220 | assert(u); | |
221 | assert(dev); | |
222 | assert(path); | |
223 | ||
224 | model = udev_device_get_property_value(dev, "ID_MODEL_FROM_DATABASE"); | |
225 | if (!model) | |
226 | model = udev_device_get_property_value(dev, "ID_MODEL"); | |
227 | ||
228 | if (model) { | |
229 | const char *label; | |
230 | ||
231 | /* Try to concatenate the device model string with a label, if there is one */ | |
232 | label = udev_device_get_property_value(dev, "ID_FS_LABEL"); | |
233 | if (!label) | |
234 | label = udev_device_get_property_value(dev, "ID_PART_ENTRY_NAME"); | |
235 | if (!label) | |
236 | label = udev_device_get_property_value(dev, "ID_PART_ENTRY_NUMBER"); | |
237 | ||
238 | if (label) { | |
239 | _cleanup_free_ char *j; | |
240 | ||
241 | j = strjoin(model, " ", label, NULL); | |
242 | if (j) | |
628c89cc | 243 | r = unit_set_description(u, j); |
c43b2132 TA |
244 | else |
245 | r = -ENOMEM; | |
628c89cc LP |
246 | } else |
247 | r = unit_set_description(u, model); | |
248 | } else | |
249 | r = unit_set_description(u, path); | |
965e5c5d | 250 | |
628c89cc | 251 | if (r < 0) |
f2341e0a | 252 | log_unit_error_errno(u, r, "Failed to set device description: %m"); |
965e5c5d | 253 | |
628c89cc | 254 | return r; |
965e5c5d LP |
255 | } |
256 | ||
257 | static int device_add_udev_wants(Unit *u, struct udev_device *dev) { | |
258 | const char *wants; | |
a2a5291b | 259 | const char *word, *state; |
965e5c5d LP |
260 | size_t l; |
261 | int r; | |
b2fadec6 | 262 | const char *property; |
965e5c5d LP |
263 | |
264 | assert(u); | |
265 | assert(dev); | |
266 | ||
b2fadec6 ZJS |
267 | property = u->manager->running_as == SYSTEMD_USER ? "SYSTEMD_USER_WANTS" : "SYSTEMD_WANTS"; |
268 | wants = udev_device_get_property_value(dev, property); | |
965e5c5d LP |
269 | if (!wants) |
270 | return 0; | |
271 | ||
a2a5291b | 272 | FOREACH_WORD_QUOTED(word, l, wants, state) { |
965e5c5d LP |
273 | _cleanup_free_ char *n = NULL; |
274 | char e[l+1]; | |
275 | ||
a2a5291b | 276 | memcpy(e, word, l); |
965e5c5d LP |
277 | e[l] = 0; |
278 | ||
7410616c LP |
279 | r = unit_name_mangle(e, UNIT_NAME_NOGLOB, &n); |
280 | if (r < 0) | |
f2341e0a | 281 | return log_unit_error_errno(u, r, "Failed to mangle unit name: %m"); |
965e5c5d LP |
282 | |
283 | r = unit_add_dependency_by_name(u, UNIT_WANTS, n, NULL, true); | |
284 | if (r < 0) | |
f2341e0a | 285 | return log_unit_error_errno(u, r, "Failed to add wants dependency: %m"); |
965e5c5d | 286 | } |
b2fadec6 | 287 | if (!isempty(state)) |
f2341e0a | 288 | log_unit_warning(u, "Property %s on %s has trailing garbage, ignoring.", property, strna(udev_device_get_syspath(dev))); |
965e5c5d LP |
289 | |
290 | return 0; | |
291 | } | |
292 | ||
628c89cc LP |
293 | static int device_setup_unit(Manager *m, struct udev_device *dev, const char *path, bool main) { |
294 | _cleanup_free_ char *e = NULL; | |
965e5c5d | 295 | const char *sysfs; |
25ac040b | 296 | Unit *u = NULL; |
25ac040b | 297 | bool delete; |
965e5c5d | 298 | int r; |
25ac040b LP |
299 | |
300 | assert(m); | |
965e5c5d LP |
301 | assert(dev); |
302 | assert(path); | |
25ac040b | 303 | |
b47d419c ZJS |
304 | sysfs = udev_device_get_syspath(dev); |
305 | if (!sysfs) | |
f1421cc6 | 306 | return 0; |
7f275a9f | 307 | |
7410616c LP |
308 | r = unit_name_from_path(path, ".device", &e); |
309 | if (r < 0) | |
7f629b74 | 310 | return log_error_errno(r, "Failed to generate unit name from device path: %m"); |
628c89cc LP |
311 | |
312 | u = manager_get_unit(m, e); | |
25ac040b | 313 | |
628c89cc LP |
314 | if (u && |
315 | DEVICE(u)->sysfs && | |
316 | !path_equal(DEVICE(u)->sysfs, sysfs)) { | |
f2341e0a | 317 | log_unit_debug(u, "Device %s appeared twice with different sysfs paths %s and %s", e, DEVICE(u)->sysfs, sysfs); |
8fe914ec | 318 | return -EEXIST; |
628c89cc | 319 | } |
25ac040b | 320 | |
aab14b13 LP |
321 | if (!u) { |
322 | delete = true; | |
323 | ||
7d17cfbc MS |
324 | u = unit_new(m, sizeof(Device)); |
325 | if (!u) | |
f1421cc6 | 326 | return log_oom(); |
25ac040b | 327 | |
628c89cc | 328 | r = unit_add_name(u, e); |
7d17cfbc | 329 | if (r < 0) |
25ac040b LP |
330 | goto fail; |
331 | ||
ee6cb288 LP |
332 | unit_add_to_load_queue(u); |
333 | } else | |
334 | delete = false; | |
335 | ||
336 | /* If this was created via some dependency and has not | |
337 | * actually been seen yet ->sysfs will not be | |
338 | * initialized. Hence initialize it if necessary. */ | |
339 | ||
628c89cc LP |
340 | r = device_set_sysfs(DEVICE(u), sysfs); |
341 | if (r < 0) | |
342 | goto fail; | |
aab14b13 | 343 | |
628c89cc | 344 | (void) device_update_description(u, dev, path); |
25ac040b | 345 | |
628c89cc LP |
346 | /* The additional systemd udev properties we only interpret |
347 | * for the main object */ | |
348 | if (main) | |
349 | (void) device_add_udev_wants(u, dev); | |
f94ea366 | 350 | |
f1421cc6 LP |
351 | /* Note that this won't dispatch the load queue, the caller |
352 | * has to do that if needed and appropriate */ | |
353 | ||
c1e1601e | 354 | unit_add_to_dbus_queue(u); |
25ac040b LP |
355 | return 0; |
356 | ||
357 | fail: | |
f2341e0a | 358 | log_unit_warning_errno(u, r, "Failed to set up device unit: %m"); |
ee5f3479 | 359 | |
2bb9e620 | 360 | if (delete) |
25ac040b | 361 | unit_free(u); |
ee5f3479 | 362 | |
25ac040b LP |
363 | return r; |
364 | } | |
365 | ||
628c89cc | 366 | static int device_process_new(Manager *m, struct udev_device *dev) { |
f1421cc6 | 367 | const char *sysfs, *dn, *alias; |
8fe914ec | 368 | struct udev_list_entry *item = NULL, *first = NULL; |
003ac9d0 | 369 | int r; |
8fe914ec LP |
370 | |
371 | assert(m); | |
372 | ||
718db961 LP |
373 | sysfs = udev_device_get_syspath(dev); |
374 | if (!sysfs) | |
f1421cc6 | 375 | return 0; |
8fe914ec LP |
376 | |
377 | /* Add the main unit named after the sysfs path */ | |
628c89cc | 378 | r = device_setup_unit(m, dev, sysfs, true); |
003ac9d0 HH |
379 | if (r < 0) |
380 | return r; | |
8fe914ec LP |
381 | |
382 | /* Add an additional unit for the device node */ | |
f1421cc6 LP |
383 | dn = udev_device_get_devnode(dev); |
384 | if (dn) | |
628c89cc | 385 | (void) device_setup_unit(m, dev, dn, false); |
8fe914ec LP |
386 | |
387 | /* Add additional units for all symlinks */ | |
388 | first = udev_device_get_devlinks_list_entry(dev); | |
389 | udev_list_entry_foreach(item, first) { | |
390 | const char *p; | |
5845b46b | 391 | struct stat st; |
8fe914ec LP |
392 | |
393 | /* Don't bother with the /dev/block links */ | |
394 | p = udev_list_entry_get_name(item); | |
395 | ||
396 | if (path_startswith(p, "/dev/block/") || | |
397 | path_startswith(p, "/dev/char/")) | |
398 | continue; | |
399 | ||
5845b46b LP |
400 | /* Verify that the symlink in the FS actually belongs |
401 | * to this device. This is useful to deal with | |
402 | * conflicting devices, e.g. when two disks want the | |
403 | * same /dev/disk/by-label/xxx link because they have | |
404 | * the same label. We want to make sure that the same | |
405 | * device that won the symlink wins in systemd, so we | |
ee33e53a | 406 | * check the device node major/minor */ |
5845b46b LP |
407 | if (stat(p, &st) >= 0) |
408 | if ((!S_ISBLK(st.st_mode) && !S_ISCHR(st.st_mode)) || | |
409 | st.st_rdev != udev_device_get_devnum(dev)) | |
410 | continue; | |
411 | ||
628c89cc | 412 | (void) device_setup_unit(m, dev, p, false); |
8fe914ec LP |
413 | } |
414 | ||
f1421cc6 LP |
415 | /* Add additional units for all explicitly configured |
416 | * aliases */ | |
417 | alias = udev_device_get_property_value(dev, "SYSTEMD_ALIAS"); | |
418 | if (alias) { | |
a2a5291b | 419 | const char *word, *state; |
f1421cc6 | 420 | size_t l; |
8fe914ec | 421 | |
a2a5291b | 422 | FOREACH_WORD_QUOTED(word, l, alias, state) { |
f1421cc6 | 423 | char e[l+1]; |
8fe914ec | 424 | |
a2a5291b | 425 | memcpy(e, word, l); |
f1421cc6 LP |
426 | e[l] = 0; |
427 | ||
428 | if (path_is_absolute(e)) | |
628c89cc | 429 | (void) device_setup_unit(m, dev, e, false); |
f1421cc6 LP |
430 | else |
431 | log_warning("SYSTEMD_ALIAS for %s is not an absolute path, ignoring: %s", sysfs, e); | |
432 | } | |
b2fadec6 ZJS |
433 | if (!isempty(state)) |
434 | log_warning("SYSTEMD_ALIAS for %s has trailing garbage, ignoring.", sysfs); | |
8fe914ec LP |
435 | } |
436 | ||
437 | return 0; | |
438 | } | |
439 | ||
628c89cc | 440 | static void device_update_found_one(Device *d, bool add, DeviceFound found, bool now) { |
f6200941 | 441 | DeviceFound n, previous; |
628c89cc LP |
442 | |
443 | assert(d); | |
444 | ||
445 | n = add ? (d->found | found) : (d->found & ~found); | |
446 | if (n == d->found) | |
447 | return; | |
448 | ||
f6200941 | 449 | previous = d->found; |
628c89cc LP |
450 | d->found = n; |
451 | ||
f6200941 LP |
452 | if (!now) |
453 | return; | |
454 | ||
455 | if (d->found & DEVICE_FOUND_UDEV) | |
456 | /* When the device is known to udev we consider it | |
457 | * plugged. */ | |
458 | device_set_state(d, DEVICE_PLUGGED); | |
459 | else if (d->found != DEVICE_NOT_FOUND && (previous & DEVICE_FOUND_UDEV) == 0) | |
460 | /* If the device has not been seen by udev yet, but is | |
461 | * now referenced by the kernel, then we assume the | |
462 | * kernel knows it now, and udev might soon too. */ | |
463 | device_set_state(d, DEVICE_TENTATIVE); | |
464 | else | |
465 | /* If nobody sees the device, or if the device was | |
466 | * previously seen by udev and now is only referenced | |
467 | * from the kernel, then we consider the device is | |
468 | * gone, the kernel just hasn't noticed it yet. */ | |
469 | device_set_state(d, DEVICE_DEAD); | |
628c89cc LP |
470 | } |
471 | ||
472 | static int device_update_found_by_sysfs(Manager *m, const char *sysfs, bool add, DeviceFound found, bool now) { | |
f1421cc6 | 473 | Device *d, *l; |
25ac040b LP |
474 | |
475 | assert(m); | |
628c89cc | 476 | assert(sysfs); |
25ac040b | 477 | |
628c89cc LP |
478 | if (found == DEVICE_NOT_FOUND) |
479 | return 0; | |
25ac040b | 480 | |
f1421cc6 LP |
481 | l = hashmap_get(m->devices_by_sysfs, sysfs); |
482 | LIST_FOREACH(same_sysfs, d, l) | |
628c89cc LP |
483 | device_update_found_one(d, add, found, now); |
484 | ||
485 | return 0; | |
25ac040b LP |
486 | } |
487 | ||
628c89cc LP |
488 | static int device_update_found_by_name(Manager *m, const char *path, bool add, DeviceFound found, bool now) { |
489 | _cleanup_free_ char *e = NULL; | |
490 | Unit *u; | |
7410616c | 491 | int r; |
f94ea366 LP |
492 | |
493 | assert(m); | |
628c89cc | 494 | assert(path); |
f94ea366 | 495 | |
628c89cc LP |
496 | if (found == DEVICE_NOT_FOUND) |
497 | return 0; | |
f94ea366 | 498 | |
7410616c LP |
499 | r = unit_name_from_path(path, ".device", &e); |
500 | if (r < 0) | |
501 | return log_error_errno(r, "Failed to generate unit name from device path: %m"); | |
f94ea366 | 502 | |
628c89cc LP |
503 | u = manager_get_unit(m, e); |
504 | if (!u) | |
505 | return 0; | |
506 | ||
507 | device_update_found_one(DEVICE(u), add, found, now); | |
f94ea366 LP |
508 | return 0; |
509 | } | |
510 | ||
f1421cc6 LP |
511 | static bool device_is_ready(struct udev_device *dev) { |
512 | const char *ready; | |
513 | ||
514 | assert(dev); | |
515 | ||
516 | ready = udev_device_get_property_value(dev, "SYSTEMD_READY"); | |
517 | if (!ready) | |
518 | return true; | |
519 | ||
520 | return parse_boolean(ready) != 0; | |
521 | } | |
522 | ||
a7f241db LP |
523 | static Unit *device_following(Unit *u) { |
524 | Device *d = DEVICE(u); | |
525 | Device *other, *first = NULL; | |
526 | ||
527 | assert(d); | |
528 | ||
ac155bb8 | 529 | if (startswith(u->id, "sys-")) |
a7f241db LP |
530 | return NULL; |
531 | ||
532 | /* Make everybody follow the unit that's named after the sysfs path */ | |
533 | for (other = d->same_sysfs_next; other; other = other->same_sysfs_next) | |
1124fe6f | 534 | if (startswith(UNIT(other)->id, "sys-")) |
a7f241db LP |
535 | return UNIT(other); |
536 | ||
537 | for (other = d->same_sysfs_prev; other; other = other->same_sysfs_prev) { | |
1124fe6f | 538 | if (startswith(UNIT(other)->id, "sys-")) |
a7f241db LP |
539 | return UNIT(other); |
540 | ||
541 | first = other; | |
542 | } | |
543 | ||
544 | return UNIT(first); | |
545 | } | |
546 | ||
f1421cc6 LP |
547 | static int device_following_set(Unit *u, Set **_set) { |
548 | Device *d = DEVICE(u), *other; | |
549 | Set *set; | |
6210e7fc LP |
550 | int r; |
551 | ||
552 | assert(d); | |
f1421cc6 | 553 | assert(_set); |
6210e7fc | 554 | |
f1421cc6 LP |
555 | if (LIST_JUST_US(same_sysfs, d)) { |
556 | *_set = NULL; | |
6210e7fc LP |
557 | return 0; |
558 | } | |
559 | ||
d5099efc | 560 | set = set_new(NULL); |
f1421cc6 | 561 | if (!set) |
6210e7fc LP |
562 | return -ENOMEM; |
563 | ||
f1421cc6 LP |
564 | LIST_FOREACH_AFTER(same_sysfs, other, d) { |
565 | r = set_put(set, other); | |
566 | if (r < 0) | |
6210e7fc | 567 | goto fail; |
f1421cc6 | 568 | } |
6210e7fc | 569 | |
f1421cc6 LP |
570 | LIST_FOREACH_BEFORE(same_sysfs, other, d) { |
571 | r = set_put(set, other); | |
572 | if (r < 0) | |
6210e7fc | 573 | goto fail; |
f1421cc6 | 574 | } |
6210e7fc | 575 | |
f1421cc6 | 576 | *_set = set; |
6210e7fc LP |
577 | return 1; |
578 | ||
579 | fail: | |
f1421cc6 | 580 | set_free(set); |
6210e7fc LP |
581 | return r; |
582 | } | |
583 | ||
25ac040b LP |
584 | static void device_shutdown(Manager *m) { |
585 | assert(m); | |
586 | ||
718db961 LP |
587 | m->udev_event_source = sd_event_source_unref(m->udev_event_source); |
588 | ||
a16e1123 | 589 | if (m->udev_monitor) { |
f94ea366 | 590 | udev_monitor_unref(m->udev_monitor); |
a16e1123 LP |
591 | m->udev_monitor = NULL; |
592 | } | |
f94ea366 | 593 | |
8fe914ec LP |
594 | hashmap_free(m->devices_by_sysfs); |
595 | m->devices_by_sysfs = NULL; | |
25ac040b LP |
596 | } |
597 | ||
598 | static int device_enumerate(Manager *m) { | |
718db961 | 599 | _cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL; |
25ac040b | 600 | struct udev_list_entry *item = NULL, *first = NULL; |
718db961 | 601 | int r; |
25ac040b LP |
602 | |
603 | assert(m); | |
604 | ||
9670d583 | 605 | if (!m->udev_monitor) { |
718db961 LP |
606 | m->udev_monitor = udev_monitor_new_from_netlink(m->udev, "udev"); |
607 | if (!m->udev_monitor) { | |
a16e1123 LP |
608 | r = -ENOMEM; |
609 | goto fail; | |
610 | } | |
f94ea366 | 611 | |
47ae6e67 LP |
612 | /* This will fail if we are unprivileged, but that |
613 | * should not matter much, as user instances won't run | |
614 | * during boot. */ | |
8fa158e7 | 615 | (void) udev_monitor_set_receive_buffer_size(m->udev_monitor, 128*1024*1024); |
99448c1f | 616 | |
718db961 LP |
617 | r = udev_monitor_filter_add_match_tag(m->udev_monitor, "systemd"); |
618 | if (r < 0) | |
e1ce2c27 | 619 | goto fail; |
e1ce2c27 | 620 | |
718db961 LP |
621 | r = udev_monitor_enable_receiving(m->udev_monitor); |
622 | if (r < 0) | |
a16e1123 | 623 | goto fail; |
f94ea366 | 624 | |
151b9b96 | 625 | 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 |
626 | if (r < 0) |
627 | goto fail; | |
7dfbe2e3 TG |
628 | |
629 | (void) sd_event_source_set_description(m->udev_event_source, "device"); | |
a16e1123 | 630 | } |
f94ea366 | 631 | |
718db961 LP |
632 | e = udev_enumerate_new(m->udev); |
633 | if (!e) { | |
4f2d528d LP |
634 | r = -ENOMEM; |
635 | goto fail; | |
636 | } | |
718db961 LP |
637 | |
638 | r = udev_enumerate_add_match_tag(e, "systemd"); | |
639 | if (r < 0) | |
e1ce2c27 | 640 | goto fail; |
25ac040b | 641 | |
e1202047 LP |
642 | r = udev_enumerate_add_match_is_initialized(e); |
643 | if (r < 0) | |
644 | goto fail; | |
645 | ||
718db961 LP |
646 | r = udev_enumerate_scan_devices(e); |
647 | if (r < 0) | |
4f2d528d | 648 | goto fail; |
25ac040b | 649 | |
4f2d528d | 650 | first = udev_enumerate_get_list_entry(e); |
628c89cc LP |
651 | udev_list_entry_foreach(item, first) { |
652 | _cleanup_udev_device_unref_ struct udev_device *dev = NULL; | |
653 | const char *sysfs; | |
654 | ||
655 | sysfs = udev_list_entry_get_name(item); | |
656 | ||
657 | dev = udev_device_new_from_syspath(m->udev, sysfs); | |
658 | if (!dev) { | |
659 | log_oom(); | |
660 | continue; | |
661 | } | |
662 | ||
663 | if (!device_is_ready(dev)) | |
664 | continue; | |
665 | ||
666 | (void) device_process_new(m, dev); | |
667 | ||
668 | device_update_found_by_sysfs(m, sysfs, true, DEVICE_FOUND_UDEV, false); | |
669 | } | |
25ac040b | 670 | |
25ac040b LP |
671 | return 0; |
672 | ||
673 | fail: | |
628c89cc LP |
674 | log_error_errno(r, "Failed to enumerate devices: %m"); |
675 | ||
25ac040b LP |
676 | device_shutdown(m); |
677 | return r; | |
5cb5a6ff LP |
678 | } |
679 | ||
718db961 LP |
680 | static int device_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) { |
681 | _cleanup_udev_device_unref_ struct udev_device *dev = NULL; | |
718db961 | 682 | Manager *m = userdata; |
628c89cc | 683 | const char *action, *sysfs; |
718db961 | 684 | int r; |
f94ea366 LP |
685 | |
686 | assert(m); | |
99448c1f | 687 | |
718db961 | 688 | if (revents != EPOLLIN) { |
99448c1f KS |
689 | static RATELIMIT_DEFINE(limit, 10*USEC_PER_SEC, 5); |
690 | ||
691 | if (!ratelimit_test(&limit)) | |
56f64d95 | 692 | log_error_errno(errno, "Failed to get udev event: %m"); |
718db961 LP |
693 | if (!(revents & EPOLLIN)) |
694 | return 0; | |
99448c1f | 695 | } |
f94ea366 | 696 | |
718db961 LP |
697 | /* |
698 | * libudev might filter-out devices which pass the bloom | |
699 | * filter, so getting NULL here is not necessarily an error. | |
700 | */ | |
701 | dev = udev_monitor_receive_device(m->udev_monitor); | |
702 | if (!dev) | |
703 | return 0; | |
f94ea366 | 704 | |
628c89cc LP |
705 | sysfs = udev_device_get_syspath(dev); |
706 | if (!sysfs) { | |
707 | log_error("Failed to get udev sys path."); | |
708 | return 0; | |
709 | } | |
710 | ||
718db961 LP |
711 | action = udev_device_get_action(dev); |
712 | if (!action) { | |
f94ea366 | 713 | log_error("Failed to get udev action string."); |
718db961 | 714 | return 0; |
f94ea366 LP |
715 | } |
716 | ||
628c89cc LP |
717 | if (streq(action, "remove")) { |
718 | r = swap_process_device_remove(m, dev); | |
9670d583 | 719 | if (r < 0) |
da927ba9 | 720 | log_error_errno(r, "Failed to process swap device remove event: %m"); |
9670d583 | 721 | |
628c89cc LP |
722 | /* If we get notified that a device was removed by |
723 | * udev, then it's completely gone, hence unset all | |
724 | * found bits */ | |
725 | device_update_found_by_sysfs(m, sysfs, false, DEVICE_FOUND_UDEV|DEVICE_FOUND_MOUNT|DEVICE_FOUND_SWAP, true); | |
f1421cc6 | 726 | |
628c89cc LP |
727 | } else if (device_is_ready(dev)) { |
728 | ||
729 | (void) device_process_new(m, dev); | |
730 | ||
731 | r = swap_process_device_new(m, dev); | |
9670d583 | 732 | if (r < 0) |
da927ba9 | 733 | log_error_errno(r, "Failed to process swap device new event: %m"); |
9670d583 | 734 | |
f1421cc6 LP |
735 | manager_dispatch_load_queue(m); |
736 | ||
628c89cc LP |
737 | /* The device is found now, set the udev found bit */ |
738 | device_update_found_by_sysfs(m, sysfs, true, DEVICE_FOUND_UDEV, true); | |
739 | ||
740 | } else { | |
741 | /* The device is nominally around, but not ready for | |
742 | * us. Hence unset the udev bit, but leave the rest | |
743 | * around. */ | |
744 | ||
745 | device_update_found_by_sysfs(m, sysfs, false, DEVICE_FOUND_UDEV, true); | |
f94ea366 LP |
746 | } |
747 | ||
718db961 | 748 | return 0; |
f94ea366 LP |
749 | } |
750 | ||
1c2e9646 | 751 | static bool device_supported(void) { |
0faacd47 | 752 | static int read_only = -1; |
0faacd47 LP |
753 | |
754 | /* If /sys is read-only we don't support device units, and any | |
755 | * attempts to start one should fail immediately. */ | |
756 | ||
757 | if (read_only < 0) | |
758 | read_only = path_is_read_only_fs("/sys"); | |
759 | ||
760 | return read_only <= 0; | |
761 | } | |
762 | ||
628c89cc LP |
763 | int device_found_node(Manager *m, const char *node, bool add, DeviceFound found, bool now) { |
764 | _cleanup_udev_device_unref_ struct udev_device *dev = NULL; | |
765 | struct stat st; | |
766 | ||
767 | assert(m); | |
768 | assert(node); | |
769 | ||
770 | /* This is called whenever we find a device referenced in | |
771 | * /proc/swaps or /proc/self/mounts. Such a device might be | |
772 | * mounted/enabled at a time where udev has not finished | |
773 | * probing it yet, and we thus haven't learned about it | |
774 | * yet. In this case we will set the device unit to | |
775 | * "tentative" state. */ | |
776 | ||
777 | if (add) { | |
778 | if (!path_startswith(node, "/dev")) | |
779 | return 0; | |
780 | ||
f6200941 LP |
781 | /* We make an extra check here, if the device node |
782 | * actually exists. If it's missing, then this is an | |
783 | * indication that device was unplugged but is still | |
784 | * referenced in /proc/swaps or | |
785 | * /proc/self/mountinfo. Note that this check doesn't | |
786 | * really cover all cases where a device might be gone | |
787 | * away, since drives that can have a medium inserted | |
788 | * will still have a device node even when the medium | |
789 | * is not there... */ | |
790 | ||
628c89cc LP |
791 | if (stat(node, &st) < 0) { |
792 | if (errno == ENOENT) | |
793 | return 0; | |
794 | ||
795 | return log_error_errno(errno, "Failed to stat device node file %s: %m", node); | |
796 | } | |
797 | ||
798 | if (!S_ISBLK(st.st_mode) && !S_ISCHR(st.st_mode)) | |
799 | return 0; | |
800 | ||
801 | dev = udev_device_new_from_devnum(m->udev, S_ISBLK(st.st_mode) ? 'b' : 'c', st.st_rdev); | |
802 | if (!dev) { | |
803 | if (errno == ENOENT) | |
804 | return 0; | |
805 | ||
806 | return log_oom(); | |
807 | } | |
808 | ||
809 | /* If the device is known in the kernel and newly | |
810 | * appeared, then we'll create a device unit for it, | |
811 | * under the name referenced in /proc/swaps or | |
812 | * /proc/self/mountinfo. */ | |
813 | ||
814 | (void) device_setup_unit(m, dev, node, false); | |
815 | } | |
816 | ||
817 | /* Update the device unit's state, should it exist */ | |
818 | return device_update_found_by_name(m, node, add, found, now); | |
819 | } | |
820 | ||
a16e1123 LP |
821 | static const char* const device_state_table[_DEVICE_STATE_MAX] = { |
822 | [DEVICE_DEAD] = "dead", | |
628c89cc LP |
823 | [DEVICE_TENTATIVE] = "tentative", |
824 | [DEVICE_PLUGGED] = "plugged", | |
a16e1123 LP |
825 | }; |
826 | ||
827 | DEFINE_STRING_TABLE_LOOKUP(device_state, DeviceState); | |
828 | ||
87f0e418 | 829 | const UnitVTable device_vtable = { |
7d17cfbc | 830 | .object_size = sizeof(Device), |
f975e971 LP |
831 | .sections = |
832 | "Unit\0" | |
833 | "Device\0" | |
834 | "Install\0", | |
5cb5a6ff | 835 | |
9e2f7c11 LP |
836 | .no_instances = true, |
837 | ||
faf919f1 | 838 | .init = device_init, |
034c6ed7 | 839 | .done = device_done, |
718db961 LP |
840 | .load = unit_load_fragment_and_dropin_optional, |
841 | ||
f50e0a01 LP |
842 | .coldplug = device_coldplug, |
843 | ||
f6200941 LP |
844 | .serialize = device_serialize, |
845 | .deserialize_item = device_deserialize_item, | |
846 | ||
5cb5a6ff LP |
847 | .dump = device_dump, |
848 | ||
f50e0a01 | 849 | .active_state = device_active_state, |
10a94420 | 850 | .sub_state_to_string = device_sub_state_to_string, |
25ac040b | 851 | |
c4e2ceae | 852 | .bus_interface = "org.freedesktop.systemd1.Device", |
718db961 | 853 | .bus_vtable = bus_device_vtable, |
4139c1b2 | 854 | |
a7f241db | 855 | .following = device_following, |
6210e7fc | 856 | .following_set = device_following_set, |
a7f241db | 857 | |
f50e0a01 | 858 | .enumerate = device_enumerate, |
c6918296 | 859 | .shutdown = device_shutdown, |
0faacd47 | 860 | .supported = device_supported, |
c6918296 MS |
861 | |
862 | .status_message_formats = { | |
863 | .starting_stopping = { | |
864 | [0] = "Expecting device %s...", | |
865 | }, | |
866 | .finished_start_job = { | |
867 | [JOB_DONE] = "Found device %s.", | |
868 | [JOB_TIMEOUT] = "Timed out waiting for device %s.", | |
869 | }, | |
870 | }, | |
5cb5a6ff | 871 | }; |