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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 | 24 | |
07630cea LP |
25 | #include "libudev.h" |
26 | ||
4139c1b2 | 27 | #include "dbus-device.h" |
6bedfcbb | 28 | #include "device.h" |
07630cea | 29 | #include "log.h" |
6bedfcbb | 30 | #include "parse-util.h" |
9eb977db | 31 | #include "path-util.h" |
07630cea LP |
32 | #include "string-util.h" |
33 | #include "swap.h" | |
718db961 | 34 | #include "udev-util.h" |
07630cea | 35 | #include "unit-name.h" |
9670d583 | 36 | #include "unit.h" |
5cb5a6ff | 37 | |
f50e0a01 LP |
38 | static const UnitActiveState state_translation_table[_DEVICE_STATE_MAX] = { |
39 | [DEVICE_DEAD] = UNIT_INACTIVE, | |
628c89cc LP |
40 | [DEVICE_TENTATIVE] = UNIT_ACTIVATING, |
41 | [DEVICE_PLUGGED] = UNIT_ACTIVE, | |
f50e0a01 LP |
42 | }; |
43 | ||
718db961 LP |
44 | static int device_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata); |
45 | ||
8fe914ec | 46 | static void device_unset_sysfs(Device *d) { |
f1421cc6 | 47 | Hashmap *devices; |
8fe914ec LP |
48 | Device *first; |
49 | ||
50 | assert(d); | |
51 | ||
a7f241db LP |
52 | if (!d->sysfs) |
53 | return; | |
54 | ||
55 | /* Remove this unit from the chain of devices which share the | |
56 | * same sysfs path. */ | |
f1421cc6 LP |
57 | devices = UNIT(d)->manager->devices_by_sysfs; |
58 | first = hashmap_get(devices, d->sysfs); | |
71fda00f | 59 | LIST_REMOVE(same_sysfs, first, d); |
8fe914ec | 60 | |
a7f241db | 61 | if (first) |
f1421cc6 | 62 | hashmap_remove_and_replace(devices, d->sysfs, first->sysfs, first); |
a7f241db | 63 | else |
f1421cc6 | 64 | hashmap_remove(devices, d->sysfs); |
a7f241db | 65 | |
a1e58e8e | 66 | d->sysfs = mfree(d->sysfs); |
8fe914ec LP |
67 | } |
68 | ||
628c89cc LP |
69 | static int device_set_sysfs(Device *d, const char *sysfs) { |
70 | Device *first; | |
71 | char *copy; | |
72 | int r; | |
73 | ||
74 | assert(d); | |
75 | ||
76 | if (streq_ptr(d->sysfs, sysfs)) | |
77 | return 0; | |
78 | ||
79 | r = hashmap_ensure_allocated(&UNIT(d)->manager->devices_by_sysfs, &string_hash_ops); | |
80 | if (r < 0) | |
81 | return r; | |
82 | ||
83 | copy = strdup(sysfs); | |
84 | if (!copy) | |
85 | return -ENOMEM; | |
86 | ||
87 | device_unset_sysfs(d); | |
88 | ||
89 | first = hashmap_get(UNIT(d)->manager->devices_by_sysfs, sysfs); | |
90 | LIST_PREPEND(same_sysfs, first, d); | |
91 | ||
92 | r = hashmap_replace(UNIT(d)->manager->devices_by_sysfs, copy, first); | |
93 | if (r < 0) { | |
94 | LIST_REMOVE(same_sysfs, first, d); | |
95 | free(copy); | |
96 | return r; | |
97 | } | |
98 | ||
99 | d->sysfs = copy; | |
100 | ||
101 | return 0; | |
102 | } | |
103 | ||
faf919f1 LP |
104 | static void device_init(Unit *u) { |
105 | Device *d = DEVICE(u); | |
106 | ||
107 | assert(d); | |
1124fe6f | 108 | assert(UNIT(d)->load_state == UNIT_STUB); |
faf919f1 | 109 | |
8fe914ec LP |
110 | /* In contrast to all other unit types we timeout jobs waiting |
111 | * for devices by default. This is because they otherwise wait | |
35b8ca3a | 112 | * indefinitely for plugged in devices, something which cannot |
8fe914ec LP |
113 | * happen for the other units since their operations time out |
114 | * anyway. */ | |
f1421cc6 | 115 | u->job_timeout = u->manager->default_timeout_start_usec; |
c8f4d764 | 116 | |
f1421cc6 LP |
117 | u->ignore_on_isolate = true; |
118 | u->ignore_on_snapshot = true; | |
faf919f1 LP |
119 | } |
120 | ||
87f0e418 LP |
121 | static void device_done(Unit *u) { |
122 | Device *d = DEVICE(u); | |
034c6ed7 LP |
123 | |
124 | assert(d); | |
e537352b | 125 | |
8fe914ec | 126 | device_unset_sysfs(d); |
e537352b LP |
127 | } |
128 | ||
f50e0a01 LP |
129 | static void device_set_state(Device *d, DeviceState state) { |
130 | DeviceState old_state; | |
131 | assert(d); | |
5cb5a6ff | 132 | |
f50e0a01 LP |
133 | old_state = d->state; |
134 | d->state = state; | |
5cb5a6ff | 135 | |
e537352b | 136 | if (state != old_state) |
f2341e0a | 137 | log_unit_debug(UNIT(d), "Changed %s -> %s", device_state_to_string(old_state), device_state_to_string(state)); |
f50e0a01 | 138 | |
e2f3b44c | 139 | unit_notify(UNIT(d), state_translation_table[old_state], state_translation_table[state], true); |
f50e0a01 LP |
140 | } |
141 | ||
be847e82 | 142 | static int device_coldplug(Unit *u) { |
f50e0a01 LP |
143 | Device *d = DEVICE(u); |
144 | ||
145 | assert(d); | |
146 | assert(d->state == DEVICE_DEAD); | |
147 | ||
628c89cc LP |
148 | if (d->found & DEVICE_FOUND_UDEV) |
149 | /* If udev says the device is around, it's around */ | |
73608ed9 | 150 | device_set_state(d, DEVICE_PLUGGED); |
f6200941 | 151 | else if (d->found != DEVICE_NOT_FOUND && d->deserialized_state != DEVICE_PLUGGED) |
628c89cc | 152 | /* If a device is found in /proc/self/mountinfo or |
f6200941 LP |
153 | * /proc/swaps, and was not yet announced via udev, |
154 | * it's "tentatively" around. */ | |
628c89cc | 155 | device_set_state(d, DEVICE_TENTATIVE); |
f50e0a01 LP |
156 | |
157 | return 0; | |
158 | } | |
159 | ||
f6200941 LP |
160 | static int device_serialize(Unit *u, FILE *f, FDSet *fds) { |
161 | Device *d = DEVICE(u); | |
162 | ||
163 | assert(u); | |
164 | assert(f); | |
165 | assert(fds); | |
166 | ||
167 | unit_serialize_item(u, f, "state", device_state_to_string(d->state)); | |
0108f6ec DM |
168 | |
169 | return 0; | |
f6200941 LP |
170 | } |
171 | ||
172 | static int device_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
173 | Device *d = DEVICE(u); | |
174 | ||
175 | assert(u); | |
176 | assert(key); | |
177 | assert(value); | |
178 | assert(fds); | |
179 | ||
180 | if (streq(key, "state")) { | |
181 | DeviceState state; | |
182 | ||
183 | state = device_state_from_string(value); | |
184 | if (state < 0) | |
f2341e0a | 185 | log_unit_debug(u, "Failed to parse state value: %s", value); |
f6200941 LP |
186 | else |
187 | d->deserialized_state = state; | |
188 | } else | |
f2341e0a | 189 | log_unit_debug(u, "Unknown serialization key: %s", key); |
f6200941 LP |
190 | |
191 | return 0; | |
192 | } | |
193 | ||
f50e0a01 | 194 | static void device_dump(Unit *u, FILE *f, const char *prefix) { |
25ac040b | 195 | Device *d = DEVICE(u); |
5cb5a6ff | 196 | |
25ac040b | 197 | assert(d); |
5cb5a6ff LP |
198 | |
199 | fprintf(f, | |
25ac040b LP |
200 | "%sDevice State: %s\n" |
201 | "%sSysfs Path: %s\n", | |
a16e1123 | 202 | prefix, device_state_to_string(d->state), |
f50e0a01 LP |
203 | prefix, strna(d->sysfs)); |
204 | } | |
205 | ||
44a6b1b6 | 206 | _pure_ static UnitActiveState device_active_state(Unit *u) { |
f50e0a01 LP |
207 | assert(u); |
208 | ||
209 | return state_translation_table[DEVICE(u)->state]; | |
25ac040b LP |
210 | } |
211 | ||
44a6b1b6 | 212 | _pure_ static const char *device_sub_state_to_string(Unit *u) { |
10a94420 LP |
213 | assert(u); |
214 | ||
a16e1123 | 215 | return device_state_to_string(DEVICE(u)->state); |
10a94420 LP |
216 | } |
217 | ||
628c89cc | 218 | static int device_update_description(Unit *u, struct udev_device *dev, const char *path) { |
965e5c5d | 219 | const char *model; |
628c89cc | 220 | int r; |
965e5c5d LP |
221 | |
222 | assert(u); | |
223 | assert(dev); | |
224 | assert(path); | |
225 | ||
226 | model = udev_device_get_property_value(dev, "ID_MODEL_FROM_DATABASE"); | |
227 | if (!model) | |
228 | model = udev_device_get_property_value(dev, "ID_MODEL"); | |
229 | ||
230 | if (model) { | |
231 | const char *label; | |
232 | ||
233 | /* Try to concatenate the device model string with a label, if there is one */ | |
234 | label = udev_device_get_property_value(dev, "ID_FS_LABEL"); | |
235 | if (!label) | |
236 | label = udev_device_get_property_value(dev, "ID_PART_ENTRY_NAME"); | |
237 | if (!label) | |
238 | label = udev_device_get_property_value(dev, "ID_PART_ENTRY_NUMBER"); | |
239 | ||
240 | if (label) { | |
241 | _cleanup_free_ char *j; | |
242 | ||
243 | j = strjoin(model, " ", label, NULL); | |
244 | if (j) | |
628c89cc | 245 | r = unit_set_description(u, j); |
c43b2132 TA |
246 | else |
247 | r = -ENOMEM; | |
628c89cc LP |
248 | } else |
249 | r = unit_set_description(u, model); | |
250 | } else | |
251 | r = unit_set_description(u, path); | |
965e5c5d | 252 | |
628c89cc | 253 | if (r < 0) |
f2341e0a | 254 | log_unit_error_errno(u, r, "Failed to set device description: %m"); |
965e5c5d | 255 | |
628c89cc | 256 | return r; |
965e5c5d LP |
257 | } |
258 | ||
259 | static int device_add_udev_wants(Unit *u, struct udev_device *dev) { | |
260 | const char *wants; | |
a2a5291b | 261 | const char *word, *state; |
965e5c5d LP |
262 | size_t l; |
263 | int r; | |
b2fadec6 | 264 | const char *property; |
965e5c5d LP |
265 | |
266 | assert(u); | |
267 | assert(dev); | |
268 | ||
b2c23da8 | 269 | property = u->manager->running_as == MANAGER_USER ? "MANAGER_USER_WANTS" : "SYSTEMD_WANTS"; |
b2fadec6 | 270 | wants = udev_device_get_property_value(dev, property); |
965e5c5d LP |
271 | if (!wants) |
272 | return 0; | |
273 | ||
a2a5291b | 274 | FOREACH_WORD_QUOTED(word, l, wants, state) { |
965e5c5d LP |
275 | _cleanup_free_ char *n = NULL; |
276 | char e[l+1]; | |
277 | ||
a2a5291b | 278 | memcpy(e, word, l); |
965e5c5d LP |
279 | e[l] = 0; |
280 | ||
7410616c LP |
281 | r = unit_name_mangle(e, UNIT_NAME_NOGLOB, &n); |
282 | if (r < 0) | |
f2341e0a | 283 | return log_unit_error_errno(u, r, "Failed to mangle unit name: %m"); |
965e5c5d LP |
284 | |
285 | r = unit_add_dependency_by_name(u, UNIT_WANTS, n, NULL, true); | |
286 | if (r < 0) | |
f2341e0a | 287 | return log_unit_error_errno(u, r, "Failed to add wants dependency: %m"); |
965e5c5d | 288 | } |
b2fadec6 | 289 | if (!isempty(state)) |
f2341e0a | 290 | log_unit_warning(u, "Property %s on %s has trailing garbage, ignoring.", property, strna(udev_device_get_syspath(dev))); |
965e5c5d LP |
291 | |
292 | return 0; | |
293 | } | |
294 | ||
628c89cc LP |
295 | static int device_setup_unit(Manager *m, struct udev_device *dev, const char *path, bool main) { |
296 | _cleanup_free_ char *e = NULL; | |
2005219f | 297 | const char *sysfs = NULL; |
25ac040b | 298 | Unit *u = NULL; |
25ac040b | 299 | bool delete; |
965e5c5d | 300 | int r; |
25ac040b LP |
301 | |
302 | assert(m); | |
965e5c5d | 303 | assert(path); |
25ac040b | 304 | |
2005219f MP |
305 | if (dev) { |
306 | sysfs = udev_device_get_syspath(dev); | |
307 | if (!sysfs) | |
308 | return 0; | |
309 | } | |
7f275a9f | 310 | |
7410616c LP |
311 | r = unit_name_from_path(path, ".device", &e); |
312 | if (r < 0) | |
7f629b74 | 313 | return log_error_errno(r, "Failed to generate unit name from device path: %m"); |
628c89cc LP |
314 | |
315 | u = manager_get_unit(m, e); | |
25ac040b | 316 | |
628c89cc | 317 | if (u && |
2005219f | 318 | sysfs && |
628c89cc LP |
319 | DEVICE(u)->sysfs && |
320 | !path_equal(DEVICE(u)->sysfs, sysfs)) { | |
f2341e0a | 321 | log_unit_debug(u, "Device %s appeared twice with different sysfs paths %s and %s", e, DEVICE(u)->sysfs, sysfs); |
8fe914ec | 322 | return -EEXIST; |
628c89cc | 323 | } |
25ac040b | 324 | |
aab14b13 LP |
325 | if (!u) { |
326 | delete = true; | |
327 | ||
7d17cfbc MS |
328 | u = unit_new(m, sizeof(Device)); |
329 | if (!u) | |
f1421cc6 | 330 | return log_oom(); |
25ac040b | 331 | |
628c89cc | 332 | r = unit_add_name(u, e); |
7d17cfbc | 333 | if (r < 0) |
25ac040b LP |
334 | goto fail; |
335 | ||
ee6cb288 LP |
336 | unit_add_to_load_queue(u); |
337 | } else | |
338 | delete = false; | |
339 | ||
340 | /* If this was created via some dependency and has not | |
341 | * actually been seen yet ->sysfs will not be | |
342 | * initialized. Hence initialize it if necessary. */ | |
2005219f MP |
343 | if (sysfs) { |
344 | r = device_set_sysfs(DEVICE(u), sysfs); | |
345 | if (r < 0) | |
346 | goto fail; | |
ee6cb288 | 347 | |
2005219f | 348 | (void) device_update_description(u, dev, path); |
aab14b13 | 349 | |
2005219f MP |
350 | /* The additional systemd udev properties we only interpret |
351 | * for the main object */ | |
352 | if (main) | |
353 | (void) device_add_udev_wants(u, dev); | |
354 | } | |
25ac040b | 355 | |
f94ea366 | 356 | |
f1421cc6 LP |
357 | /* Note that this won't dispatch the load queue, the caller |
358 | * has to do that if needed and appropriate */ | |
359 | ||
c1e1601e | 360 | unit_add_to_dbus_queue(u); |
25ac040b LP |
361 | return 0; |
362 | ||
363 | fail: | |
f2341e0a | 364 | log_unit_warning_errno(u, r, "Failed to set up device unit: %m"); |
ee5f3479 | 365 | |
2bb9e620 | 366 | if (delete) |
25ac040b | 367 | unit_free(u); |
ee5f3479 | 368 | |
25ac040b LP |
369 | return r; |
370 | } | |
371 | ||
628c89cc | 372 | static int device_process_new(Manager *m, struct udev_device *dev) { |
f1421cc6 | 373 | const char *sysfs, *dn, *alias; |
8fe914ec | 374 | struct udev_list_entry *item = NULL, *first = NULL; |
003ac9d0 | 375 | int r; |
8fe914ec LP |
376 | |
377 | assert(m); | |
378 | ||
718db961 LP |
379 | sysfs = udev_device_get_syspath(dev); |
380 | if (!sysfs) | |
f1421cc6 | 381 | return 0; |
8fe914ec LP |
382 | |
383 | /* Add the main unit named after the sysfs path */ | |
628c89cc | 384 | r = device_setup_unit(m, dev, sysfs, true); |
003ac9d0 HH |
385 | if (r < 0) |
386 | return r; | |
8fe914ec LP |
387 | |
388 | /* Add an additional unit for the device node */ | |
f1421cc6 LP |
389 | dn = udev_device_get_devnode(dev); |
390 | if (dn) | |
628c89cc | 391 | (void) device_setup_unit(m, dev, dn, false); |
8fe914ec LP |
392 | |
393 | /* Add additional units for all symlinks */ | |
394 | first = udev_device_get_devlinks_list_entry(dev); | |
395 | udev_list_entry_foreach(item, first) { | |
396 | const char *p; | |
5845b46b | 397 | struct stat st; |
8fe914ec LP |
398 | |
399 | /* Don't bother with the /dev/block links */ | |
400 | p = udev_list_entry_get_name(item); | |
401 | ||
402 | if (path_startswith(p, "/dev/block/") || | |
403 | path_startswith(p, "/dev/char/")) | |
404 | continue; | |
405 | ||
5845b46b LP |
406 | /* Verify that the symlink in the FS actually belongs |
407 | * to this device. This is useful to deal with | |
408 | * conflicting devices, e.g. when two disks want the | |
409 | * same /dev/disk/by-label/xxx link because they have | |
410 | * the same label. We want to make sure that the same | |
411 | * device that won the symlink wins in systemd, so we | |
ee33e53a | 412 | * check the device node major/minor */ |
5845b46b LP |
413 | if (stat(p, &st) >= 0) |
414 | if ((!S_ISBLK(st.st_mode) && !S_ISCHR(st.st_mode)) || | |
415 | st.st_rdev != udev_device_get_devnum(dev)) | |
416 | continue; | |
417 | ||
628c89cc | 418 | (void) device_setup_unit(m, dev, p, false); |
8fe914ec LP |
419 | } |
420 | ||
f1421cc6 LP |
421 | /* Add additional units for all explicitly configured |
422 | * aliases */ | |
423 | alias = udev_device_get_property_value(dev, "SYSTEMD_ALIAS"); | |
424 | if (alias) { | |
a2a5291b | 425 | const char *word, *state; |
f1421cc6 | 426 | size_t l; |
8fe914ec | 427 | |
a2a5291b | 428 | FOREACH_WORD_QUOTED(word, l, alias, state) { |
f1421cc6 | 429 | char e[l+1]; |
8fe914ec | 430 | |
a2a5291b | 431 | memcpy(e, word, l); |
f1421cc6 LP |
432 | e[l] = 0; |
433 | ||
434 | if (path_is_absolute(e)) | |
628c89cc | 435 | (void) device_setup_unit(m, dev, e, false); |
f1421cc6 LP |
436 | else |
437 | log_warning("SYSTEMD_ALIAS for %s is not an absolute path, ignoring: %s", sysfs, e); | |
438 | } | |
b2fadec6 ZJS |
439 | if (!isempty(state)) |
440 | log_warning("SYSTEMD_ALIAS for %s has trailing garbage, ignoring.", sysfs); | |
8fe914ec LP |
441 | } |
442 | ||
443 | return 0; | |
444 | } | |
445 | ||
628c89cc | 446 | static void device_update_found_one(Device *d, bool add, DeviceFound found, bool now) { |
f6200941 | 447 | DeviceFound n, previous; |
628c89cc LP |
448 | |
449 | assert(d); | |
450 | ||
451 | n = add ? (d->found | found) : (d->found & ~found); | |
452 | if (n == d->found) | |
453 | return; | |
454 | ||
f6200941 | 455 | previous = d->found; |
628c89cc LP |
456 | d->found = n; |
457 | ||
f6200941 LP |
458 | if (!now) |
459 | return; | |
460 | ||
461 | if (d->found & DEVICE_FOUND_UDEV) | |
462 | /* When the device is known to udev we consider it | |
463 | * plugged. */ | |
464 | device_set_state(d, DEVICE_PLUGGED); | |
465 | else if (d->found != DEVICE_NOT_FOUND && (previous & DEVICE_FOUND_UDEV) == 0) | |
466 | /* If the device has not been seen by udev yet, but is | |
467 | * now referenced by the kernel, then we assume the | |
468 | * kernel knows it now, and udev might soon too. */ | |
469 | device_set_state(d, DEVICE_TENTATIVE); | |
470 | else | |
471 | /* If nobody sees the device, or if the device was | |
472 | * previously seen by udev and now is only referenced | |
473 | * from the kernel, then we consider the device is | |
474 | * gone, the kernel just hasn't noticed it yet. */ | |
475 | device_set_state(d, DEVICE_DEAD); | |
628c89cc LP |
476 | } |
477 | ||
478 | static int device_update_found_by_sysfs(Manager *m, const char *sysfs, bool add, DeviceFound found, bool now) { | |
f1421cc6 | 479 | Device *d, *l; |
25ac040b LP |
480 | |
481 | assert(m); | |
628c89cc | 482 | assert(sysfs); |
25ac040b | 483 | |
628c89cc LP |
484 | if (found == DEVICE_NOT_FOUND) |
485 | return 0; | |
25ac040b | 486 | |
f1421cc6 LP |
487 | l = hashmap_get(m->devices_by_sysfs, sysfs); |
488 | LIST_FOREACH(same_sysfs, d, l) | |
628c89cc LP |
489 | device_update_found_one(d, add, found, now); |
490 | ||
491 | return 0; | |
25ac040b LP |
492 | } |
493 | ||
628c89cc LP |
494 | static int device_update_found_by_name(Manager *m, const char *path, bool add, DeviceFound found, bool now) { |
495 | _cleanup_free_ char *e = NULL; | |
496 | Unit *u; | |
7410616c | 497 | int r; |
f94ea366 LP |
498 | |
499 | assert(m); | |
628c89cc | 500 | assert(path); |
f94ea366 | 501 | |
628c89cc LP |
502 | if (found == DEVICE_NOT_FOUND) |
503 | return 0; | |
f94ea366 | 504 | |
7410616c LP |
505 | r = unit_name_from_path(path, ".device", &e); |
506 | if (r < 0) | |
507 | return log_error_errno(r, "Failed to generate unit name from device path: %m"); | |
f94ea366 | 508 | |
628c89cc LP |
509 | u = manager_get_unit(m, e); |
510 | if (!u) | |
511 | return 0; | |
512 | ||
513 | device_update_found_one(DEVICE(u), add, found, now); | |
f94ea366 LP |
514 | return 0; |
515 | } | |
516 | ||
f1421cc6 LP |
517 | static bool device_is_ready(struct udev_device *dev) { |
518 | const char *ready; | |
519 | ||
520 | assert(dev); | |
521 | ||
522 | ready = udev_device_get_property_value(dev, "SYSTEMD_READY"); | |
523 | if (!ready) | |
524 | return true; | |
525 | ||
526 | return parse_boolean(ready) != 0; | |
527 | } | |
528 | ||
a7f241db LP |
529 | static Unit *device_following(Unit *u) { |
530 | Device *d = DEVICE(u); | |
531 | Device *other, *first = NULL; | |
532 | ||
533 | assert(d); | |
534 | ||
ac155bb8 | 535 | if (startswith(u->id, "sys-")) |
a7f241db LP |
536 | return NULL; |
537 | ||
538 | /* Make everybody follow the unit that's named after the sysfs path */ | |
539 | for (other = d->same_sysfs_next; other; other = other->same_sysfs_next) | |
1124fe6f | 540 | if (startswith(UNIT(other)->id, "sys-")) |
a7f241db LP |
541 | return UNIT(other); |
542 | ||
543 | for (other = d->same_sysfs_prev; other; other = other->same_sysfs_prev) { | |
1124fe6f | 544 | if (startswith(UNIT(other)->id, "sys-")) |
a7f241db LP |
545 | return UNIT(other); |
546 | ||
547 | first = other; | |
548 | } | |
549 | ||
550 | return UNIT(first); | |
551 | } | |
552 | ||
f1421cc6 LP |
553 | static int device_following_set(Unit *u, Set **_set) { |
554 | Device *d = DEVICE(u), *other; | |
555 | Set *set; | |
6210e7fc LP |
556 | int r; |
557 | ||
558 | assert(d); | |
f1421cc6 | 559 | assert(_set); |
6210e7fc | 560 | |
f1421cc6 LP |
561 | if (LIST_JUST_US(same_sysfs, d)) { |
562 | *_set = NULL; | |
6210e7fc LP |
563 | return 0; |
564 | } | |
565 | ||
d5099efc | 566 | set = set_new(NULL); |
f1421cc6 | 567 | if (!set) |
6210e7fc LP |
568 | return -ENOMEM; |
569 | ||
f1421cc6 LP |
570 | LIST_FOREACH_AFTER(same_sysfs, other, d) { |
571 | r = set_put(set, other); | |
572 | if (r < 0) | |
6210e7fc | 573 | goto fail; |
f1421cc6 | 574 | } |
6210e7fc | 575 | |
f1421cc6 LP |
576 | LIST_FOREACH_BEFORE(same_sysfs, other, d) { |
577 | r = set_put(set, other); | |
578 | if (r < 0) | |
6210e7fc | 579 | goto fail; |
f1421cc6 | 580 | } |
6210e7fc | 581 | |
f1421cc6 | 582 | *_set = set; |
6210e7fc LP |
583 | return 1; |
584 | ||
585 | fail: | |
f1421cc6 | 586 | set_free(set); |
6210e7fc LP |
587 | return r; |
588 | } | |
589 | ||
25ac040b LP |
590 | static void device_shutdown(Manager *m) { |
591 | assert(m); | |
592 | ||
718db961 LP |
593 | m->udev_event_source = sd_event_source_unref(m->udev_event_source); |
594 | ||
a16e1123 | 595 | if (m->udev_monitor) { |
f94ea366 | 596 | udev_monitor_unref(m->udev_monitor); |
a16e1123 LP |
597 | m->udev_monitor = NULL; |
598 | } | |
f94ea366 | 599 | |
525d3cc7 | 600 | m->devices_by_sysfs = hashmap_free(m->devices_by_sysfs); |
25ac040b LP |
601 | } |
602 | ||
603 | static int device_enumerate(Manager *m) { | |
718db961 | 604 | _cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL; |
25ac040b | 605 | struct udev_list_entry *item = NULL, *first = NULL; |
718db961 | 606 | int r; |
25ac040b LP |
607 | |
608 | assert(m); | |
609 | ||
9670d583 | 610 | if (!m->udev_monitor) { |
718db961 LP |
611 | m->udev_monitor = udev_monitor_new_from_netlink(m->udev, "udev"); |
612 | if (!m->udev_monitor) { | |
a16e1123 LP |
613 | r = -ENOMEM; |
614 | goto fail; | |
615 | } | |
f94ea366 | 616 | |
47ae6e67 LP |
617 | /* This will fail if we are unprivileged, but that |
618 | * should not matter much, as user instances won't run | |
619 | * during boot. */ | |
8fa158e7 | 620 | (void) udev_monitor_set_receive_buffer_size(m->udev_monitor, 128*1024*1024); |
99448c1f | 621 | |
718db961 LP |
622 | r = udev_monitor_filter_add_match_tag(m->udev_monitor, "systemd"); |
623 | if (r < 0) | |
e1ce2c27 | 624 | goto fail; |
e1ce2c27 | 625 | |
718db961 LP |
626 | r = udev_monitor_enable_receiving(m->udev_monitor); |
627 | if (r < 0) | |
a16e1123 | 628 | goto fail; |
f94ea366 | 629 | |
151b9b96 | 630 | 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 |
631 | if (r < 0) |
632 | goto fail; | |
7dfbe2e3 TG |
633 | |
634 | (void) sd_event_source_set_description(m->udev_event_source, "device"); | |
a16e1123 | 635 | } |
f94ea366 | 636 | |
718db961 LP |
637 | e = udev_enumerate_new(m->udev); |
638 | if (!e) { | |
4f2d528d LP |
639 | r = -ENOMEM; |
640 | goto fail; | |
641 | } | |
718db961 LP |
642 | |
643 | r = udev_enumerate_add_match_tag(e, "systemd"); | |
644 | if (r < 0) | |
e1ce2c27 | 645 | goto fail; |
25ac040b | 646 | |
e1202047 LP |
647 | r = udev_enumerate_add_match_is_initialized(e); |
648 | if (r < 0) | |
649 | goto fail; | |
650 | ||
718db961 LP |
651 | r = udev_enumerate_scan_devices(e); |
652 | if (r < 0) | |
4f2d528d | 653 | goto fail; |
25ac040b | 654 | |
4f2d528d | 655 | first = udev_enumerate_get_list_entry(e); |
628c89cc LP |
656 | udev_list_entry_foreach(item, first) { |
657 | _cleanup_udev_device_unref_ struct udev_device *dev = NULL; | |
658 | const char *sysfs; | |
659 | ||
660 | sysfs = udev_list_entry_get_name(item); | |
661 | ||
662 | dev = udev_device_new_from_syspath(m->udev, sysfs); | |
663 | if (!dev) { | |
664 | log_oom(); | |
665 | continue; | |
666 | } | |
667 | ||
668 | if (!device_is_ready(dev)) | |
669 | continue; | |
670 | ||
671 | (void) device_process_new(m, dev); | |
672 | ||
673 | device_update_found_by_sysfs(m, sysfs, true, DEVICE_FOUND_UDEV, false); | |
674 | } | |
25ac040b | 675 | |
25ac040b LP |
676 | return 0; |
677 | ||
678 | fail: | |
628c89cc LP |
679 | log_error_errno(r, "Failed to enumerate devices: %m"); |
680 | ||
25ac040b LP |
681 | device_shutdown(m); |
682 | return r; | |
5cb5a6ff LP |
683 | } |
684 | ||
718db961 LP |
685 | static int device_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) { |
686 | _cleanup_udev_device_unref_ struct udev_device *dev = NULL; | |
718db961 | 687 | Manager *m = userdata; |
628c89cc | 688 | const char *action, *sysfs; |
718db961 | 689 | int r; |
f94ea366 LP |
690 | |
691 | assert(m); | |
99448c1f | 692 | |
718db961 | 693 | if (revents != EPOLLIN) { |
99448c1f KS |
694 | static RATELIMIT_DEFINE(limit, 10*USEC_PER_SEC, 5); |
695 | ||
696 | if (!ratelimit_test(&limit)) | |
56f64d95 | 697 | log_error_errno(errno, "Failed to get udev event: %m"); |
718db961 LP |
698 | if (!(revents & EPOLLIN)) |
699 | return 0; | |
99448c1f | 700 | } |
f94ea366 | 701 | |
718db961 LP |
702 | /* |
703 | * libudev might filter-out devices which pass the bloom | |
704 | * filter, so getting NULL here is not necessarily an error. | |
705 | */ | |
706 | dev = udev_monitor_receive_device(m->udev_monitor); | |
707 | if (!dev) | |
708 | return 0; | |
f94ea366 | 709 | |
628c89cc LP |
710 | sysfs = udev_device_get_syspath(dev); |
711 | if (!sysfs) { | |
712 | log_error("Failed to get udev sys path."); | |
713 | return 0; | |
714 | } | |
715 | ||
718db961 LP |
716 | action = udev_device_get_action(dev); |
717 | if (!action) { | |
f94ea366 | 718 | log_error("Failed to get udev action string."); |
718db961 | 719 | return 0; |
f94ea366 LP |
720 | } |
721 | ||
628c89cc LP |
722 | if (streq(action, "remove")) { |
723 | r = swap_process_device_remove(m, dev); | |
9670d583 | 724 | if (r < 0) |
da927ba9 | 725 | log_error_errno(r, "Failed to process swap device remove event: %m"); |
9670d583 | 726 | |
628c89cc LP |
727 | /* If we get notified that a device was removed by |
728 | * udev, then it's completely gone, hence unset all | |
729 | * found bits */ | |
730 | device_update_found_by_sysfs(m, sysfs, false, DEVICE_FOUND_UDEV|DEVICE_FOUND_MOUNT|DEVICE_FOUND_SWAP, true); | |
f1421cc6 | 731 | |
628c89cc LP |
732 | } else if (device_is_ready(dev)) { |
733 | ||
734 | (void) device_process_new(m, dev); | |
735 | ||
736 | r = swap_process_device_new(m, dev); | |
9670d583 | 737 | if (r < 0) |
da927ba9 | 738 | log_error_errno(r, "Failed to process swap device new event: %m"); |
9670d583 | 739 | |
f1421cc6 LP |
740 | manager_dispatch_load_queue(m); |
741 | ||
628c89cc LP |
742 | /* The device is found now, set the udev found bit */ |
743 | device_update_found_by_sysfs(m, sysfs, true, DEVICE_FOUND_UDEV, true); | |
744 | ||
745 | } else { | |
746 | /* The device is nominally around, but not ready for | |
747 | * us. Hence unset the udev bit, but leave the rest | |
748 | * around. */ | |
749 | ||
750 | device_update_found_by_sysfs(m, sysfs, false, DEVICE_FOUND_UDEV, true); | |
f94ea366 LP |
751 | } |
752 | ||
718db961 | 753 | return 0; |
f94ea366 LP |
754 | } |
755 | ||
1c2e9646 | 756 | static bool device_supported(void) { |
0faacd47 | 757 | static int read_only = -1; |
0faacd47 LP |
758 | |
759 | /* If /sys is read-only we don't support device units, and any | |
760 | * attempts to start one should fail immediately. */ | |
761 | ||
762 | if (read_only < 0) | |
763 | read_only = path_is_read_only_fs("/sys"); | |
764 | ||
765 | return read_only <= 0; | |
766 | } | |
767 | ||
628c89cc LP |
768 | int device_found_node(Manager *m, const char *node, bool add, DeviceFound found, bool now) { |
769 | _cleanup_udev_device_unref_ struct udev_device *dev = NULL; | |
770 | struct stat st; | |
771 | ||
772 | assert(m); | |
773 | assert(node); | |
774 | ||
4c6d20de LP |
775 | if (!device_supported()) |
776 | return 0; | |
777 | ||
628c89cc LP |
778 | /* This is called whenever we find a device referenced in |
779 | * /proc/swaps or /proc/self/mounts. Such a device might be | |
780 | * mounted/enabled at a time where udev has not finished | |
781 | * probing it yet, and we thus haven't learned about it | |
782 | * yet. In this case we will set the device unit to | |
783 | * "tentative" state. */ | |
784 | ||
785 | if (add) { | |
786 | if (!path_startswith(node, "/dev")) | |
787 | return 0; | |
788 | ||
f6200941 LP |
789 | /* We make an extra check here, if the device node |
790 | * actually exists. If it's missing, then this is an | |
791 | * indication that device was unplugged but is still | |
792 | * referenced in /proc/swaps or | |
793 | * /proc/self/mountinfo. Note that this check doesn't | |
794 | * really cover all cases where a device might be gone | |
795 | * away, since drives that can have a medium inserted | |
796 | * will still have a device node even when the medium | |
797 | * is not there... */ | |
798 | ||
2005219f MP |
799 | if (stat(node, &st) >= 0) { |
800 | if (!S_ISBLK(st.st_mode) && !S_ISCHR(st.st_mode)) | |
628c89cc LP |
801 | return 0; |
802 | ||
2005219f MP |
803 | dev = udev_device_new_from_devnum(m->udev, S_ISBLK(st.st_mode) ? 'b' : 'c', st.st_rdev); |
804 | if (!dev && errno != ENOENT) | |
805 | return log_error_errno(errno, "Failed to get udev device from devnum %u:%u: %m", major(st.st_rdev), minor(st.st_rdev)); | |
628c89cc | 806 | |
2005219f MP |
807 | } else if (errno != ENOENT) |
808 | return log_error_errno(errno, "Failed to stat device node file %s: %m", node); | |
628c89cc LP |
809 | |
810 | /* If the device is known in the kernel and newly | |
811 | * appeared, then we'll create a device unit for it, | |
812 | * under the name referenced in /proc/swaps or | |
813 | * /proc/self/mountinfo. */ | |
814 | ||
815 | (void) device_setup_unit(m, dev, node, false); | |
816 | } | |
817 | ||
818 | /* Update the device unit's state, should it exist */ | |
819 | return device_update_found_by_name(m, node, add, found, now); | |
820 | } | |
821 | ||
87f0e418 | 822 | const UnitVTable device_vtable = { |
7d17cfbc | 823 | .object_size = sizeof(Device), |
f975e971 LP |
824 | .sections = |
825 | "Unit\0" | |
826 | "Device\0" | |
827 | "Install\0", | |
5cb5a6ff | 828 | |
9e2f7c11 LP |
829 | .no_instances = true, |
830 | ||
faf919f1 | 831 | .init = device_init, |
034c6ed7 | 832 | .done = device_done, |
718db961 LP |
833 | .load = unit_load_fragment_and_dropin_optional, |
834 | ||
f50e0a01 LP |
835 | .coldplug = device_coldplug, |
836 | ||
f6200941 LP |
837 | .serialize = device_serialize, |
838 | .deserialize_item = device_deserialize_item, | |
839 | ||
5cb5a6ff LP |
840 | .dump = device_dump, |
841 | ||
f50e0a01 | 842 | .active_state = device_active_state, |
10a94420 | 843 | .sub_state_to_string = device_sub_state_to_string, |
25ac040b | 844 | |
718db961 | 845 | .bus_vtable = bus_device_vtable, |
4139c1b2 | 846 | |
a7f241db | 847 | .following = device_following, |
6210e7fc | 848 | .following_set = device_following_set, |
a7f241db | 849 | |
f50e0a01 | 850 | .enumerate = device_enumerate, |
c6918296 | 851 | .shutdown = device_shutdown, |
0faacd47 | 852 | .supported = device_supported, |
c6918296 MS |
853 | |
854 | .status_message_formats = { | |
855 | .starting_stopping = { | |
856 | [0] = "Expecting device %s...", | |
857 | }, | |
858 | .finished_start_job = { | |
859 | [JOB_DONE] = "Found device %s.", | |
860 | [JOB_TIMEOUT] = "Timed out waiting for device %s.", | |
861 | }, | |
862 | }, | |
5cb5a6ff | 863 | }; |