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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
a7334b09 LP |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2010 Lennart Poettering | |
6 | ||
7 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
8 | under the terms of the GNU Lesser General Public License as published by |
9 | the Free Software Foundation; either version 2.1 of the License, or | |
a7334b09 LP |
10 | (at your option) any later version. |
11 | ||
12 | systemd is distributed in the hope that it will be useful, but | |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 15 | Lesser General Public License for more details. |
a7334b09 | 16 | |
5430f7f2 | 17 | You should have received a copy of the GNU Lesser General Public License |
a7334b09 LP |
18 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
19 | ***/ | |
20 | ||
25ac040b | 21 | #include <errno.h> |
f94ea366 | 22 | #include <sys/epoll.h> |
25ac040b | 23 | |
b4bbcaa9 TA |
24 | #include "libudev.h" |
25 | ||
b5efdb8a | 26 | #include "alloc-util.h" |
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" |
8fcde012 | 32 | #include "stat-util.h" |
07630cea LP |
33 | #include "string-util.h" |
34 | #include "swap.h" | |
718db961 | 35 | #include "udev-util.h" |
07630cea | 36 | #include "unit-name.h" |
9670d583 | 37 | #include "unit.h" |
5cb5a6ff | 38 | |
f50e0a01 LP |
39 | static const UnitActiveState state_translation_table[_DEVICE_STATE_MAX] = { |
40 | [DEVICE_DEAD] = UNIT_INACTIVE, | |
628c89cc LP |
41 | [DEVICE_TENTATIVE] = UNIT_ACTIVATING, |
42 | [DEVICE_PLUGGED] = UNIT_ACTIVE, | |
f50e0a01 LP |
43 | }; |
44 | ||
718db961 LP |
45 | static int device_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata); |
46 | ||
8fe914ec | 47 | static void device_unset_sysfs(Device *d) { |
f1421cc6 | 48 | Hashmap *devices; |
8fe914ec LP |
49 | Device *first; |
50 | ||
51 | assert(d); | |
52 | ||
a7f241db LP |
53 | if (!d->sysfs) |
54 | return; | |
55 | ||
56 | /* Remove this unit from the chain of devices which share the | |
57 | * same sysfs path. */ | |
f1421cc6 LP |
58 | devices = UNIT(d)->manager->devices_by_sysfs; |
59 | first = hashmap_get(devices, d->sysfs); | |
71fda00f | 60 | LIST_REMOVE(same_sysfs, first, d); |
8fe914ec | 61 | |
a7f241db | 62 | if (first) |
f1421cc6 | 63 | hashmap_remove_and_replace(devices, d->sysfs, first->sysfs, first); |
a7f241db | 64 | else |
f1421cc6 | 65 | hashmap_remove(devices, d->sysfs); |
a7f241db | 66 | |
a1e58e8e | 67 | d->sysfs = mfree(d->sysfs); |
8fe914ec LP |
68 | } |
69 | ||
628c89cc LP |
70 | static int device_set_sysfs(Device *d, const char *sysfs) { |
71 | Device *first; | |
72 | char *copy; | |
73 | int r; | |
74 | ||
75 | assert(d); | |
76 | ||
77 | if (streq_ptr(d->sysfs, sysfs)) | |
78 | return 0; | |
79 | ||
548f6937 | 80 | r = hashmap_ensure_allocated(&UNIT(d)->manager->devices_by_sysfs, &path_hash_ops); |
628c89cc LP |
81 | if (r < 0) |
82 | return r; | |
83 | ||
84 | copy = strdup(sysfs); | |
85 | if (!copy) | |
86 | return -ENOMEM; | |
87 | ||
88 | device_unset_sysfs(d); | |
89 | ||
90 | first = hashmap_get(UNIT(d)->manager->devices_by_sysfs, sysfs); | |
91 | LIST_PREPEND(same_sysfs, first, d); | |
92 | ||
93 | r = hashmap_replace(UNIT(d)->manager->devices_by_sysfs, copy, first); | |
94 | if (r < 0) { | |
95 | LIST_REMOVE(same_sysfs, first, d); | |
96 | free(copy); | |
97 | return r; | |
98 | } | |
99 | ||
100 | d->sysfs = copy; | |
101 | ||
102 | return 0; | |
103 | } | |
104 | ||
faf919f1 LP |
105 | static void device_init(Unit *u) { |
106 | Device *d = DEVICE(u); | |
107 | ||
108 | assert(d); | |
1124fe6f | 109 | assert(UNIT(d)->load_state == UNIT_STUB); |
faf919f1 | 110 | |
8fe914ec LP |
111 | /* In contrast to all other unit types we timeout jobs waiting |
112 | * for devices by default. This is because they otherwise wait | |
35b8ca3a | 113 | * indefinitely for plugged in devices, something which cannot |
8fe914ec LP |
114 | * happen for the other units since their operations time out |
115 | * anyway. */ | |
d9732d78 | 116 | u->job_running_timeout = u->manager->default_timeout_start_usec; |
c8f4d764 | 117 | |
f1421cc6 | 118 | u->ignore_on_isolate = 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 | ||
605405c6 | 243 | j = strjoin(model, " ", label); |
965e5c5d | 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) { | |
de040543 | 260 | const char *wants, *property; |
965e5c5d LP |
261 | int r; |
262 | ||
263 | assert(u); | |
264 | assert(dev); | |
265 | ||
463d0d15 | 266 | property = MANAGER_IS_USER(u->manager) ? "SYSTEMD_USER_WANTS" : "SYSTEMD_WANTS"; |
de040543 | 267 | |
b2fadec6 | 268 | wants = udev_device_get_property_value(dev, property); |
de040543 LP |
269 | if (!wants) |
270 | return 0; | |
271 | ||
272 | for (;;) { | |
ceed8f0c | 273 | _cleanup_free_ char *word = NULL, *k = NULL; |
965e5c5d | 274 | |
de040543 | 275 | r = extract_first_word(&wants, &word, NULL, EXTRACT_QUOTES); |
ceed8f0c ZJS |
276 | if (r == 0) |
277 | return 0; | |
278 | if (r == -ENOMEM) | |
279 | return log_oom(); | |
280 | if (r < 0) | |
dcebc9ba | 281 | return log_unit_error_errno(u, r, "Failed to parse property %s with value %s: %m", property, wants); |
965e5c5d | 282 | |
dcebc9ba LP |
283 | if (unit_name_is_valid(word, UNIT_NAME_TEMPLATE) && DEVICE(u)->sysfs) { |
284 | _cleanup_free_ char *escaped = NULL; | |
285 | ||
286 | /* If the unit name is specified as template, then automatically fill in the sysfs path of the | |
287 | * device as instance name, properly escaped. */ | |
288 | ||
289 | r = unit_name_path_escape(DEVICE(u)->sysfs, &escaped); | |
290 | if (r < 0) | |
291 | return log_unit_error_errno(u, r, "Failed to escape %s: %m", DEVICE(u)->sysfs); | |
292 | ||
293 | r = unit_name_replace_instance(word, escaped, &k); | |
294 | if (r < 0) | |
295 | return log_unit_error_errno(u, r, "Failed to build %s instance of template %s: %m", escaped, word); | |
296 | } else { | |
297 | /* If this is not a template, then let's mangle it so, that it becomes a valid unit name. */ | |
298 | ||
37cbc1d5 | 299 | r = unit_name_mangle(word, UNIT_NAME_MANGLE_WARN, &k); |
dcebc9ba LP |
300 | if (r < 0) |
301 | return log_unit_error_errno(u, r, "Failed to mangle unit name \"%s\": %m", word); | |
302 | } | |
965e5c5d | 303 | |
eef85c4a | 304 | r = unit_add_dependency_by_name(u, UNIT_WANTS, k, NULL, true, UNIT_DEPENDENCY_UDEV); |
965e5c5d | 305 | if (r < 0) |
de040543 | 306 | return log_unit_error_errno(u, r, "Failed to add Wants= dependency: %m"); |
965e5c5d | 307 | } |
965e5c5d LP |
308 | } |
309 | ||
40b1a32c | 310 | static bool device_is_bound_by_mounts(Device *d, struct udev_device *dev) { |
ebc8968b | 311 | const char *bound_by; |
40b1a32c | 312 | int r; |
ebc8968b FB |
313 | |
314 | assert(d); | |
315 | assert(dev); | |
316 | ||
317 | bound_by = udev_device_get_property_value(dev, "SYSTEMD_MOUNT_DEVICE_BOUND"); | |
40b1a32c LP |
318 | if (bound_by) { |
319 | r = parse_boolean(bound_by); | |
320 | if (r < 0) | |
321 | log_warning_errno(r, "Failed to parse SYSTEMD_MOUNT_DEVICE_BOUND='%s' udev property of %s, ignoring: %m", bound_by, strna(d->sysfs)); | |
ebc8968b | 322 | |
40b1a32c LP |
323 | d->bind_mounts = r > 0; |
324 | } else | |
325 | d->bind_mounts = false; | |
326 | ||
327 | return d->bind_mounts; | |
ebc8968b FB |
328 | } |
329 | ||
330 | static int device_upgrade_mount_deps(Unit *u) { | |
331 | Unit *other; | |
332 | Iterator i; | |
eef85c4a | 333 | void *v; |
ebc8968b FB |
334 | int r; |
335 | ||
eef85c4a LP |
336 | /* Let's upgrade Requires= to BindsTo= on us. (Used when SYSTEMD_MOUNT_DEVICE_BOUND is set) */ |
337 | ||
338 | HASHMAP_FOREACH_KEY(v, other, u->dependencies[UNIT_REQUIRED_BY], i) { | |
ebc8968b FB |
339 | if (other->type != UNIT_MOUNT) |
340 | continue; | |
341 | ||
eef85c4a | 342 | r = unit_add_dependency(other, UNIT_BINDS_TO, u, true, UNIT_DEPENDENCY_UDEV); |
ebc8968b FB |
343 | if (r < 0) |
344 | return r; | |
345 | } | |
346 | return 0; | |
347 | } | |
348 | ||
628c89cc LP |
349 | static int device_setup_unit(Manager *m, struct udev_device *dev, const char *path, bool main) { |
350 | _cleanup_free_ char *e = NULL; | |
2005219f | 351 | const char *sysfs = NULL; |
25ac040b | 352 | Unit *u = NULL; |
25ac040b | 353 | bool delete; |
965e5c5d | 354 | int r; |
25ac040b LP |
355 | |
356 | assert(m); | |
965e5c5d | 357 | assert(path); |
25ac040b | 358 | |
2005219f MP |
359 | if (dev) { |
360 | sysfs = udev_device_get_syspath(dev); | |
361 | if (!sysfs) | |
362 | return 0; | |
363 | } | |
7f275a9f | 364 | |
7410616c LP |
365 | r = unit_name_from_path(path, ".device", &e); |
366 | if (r < 0) | |
7f629b74 | 367 | return log_error_errno(r, "Failed to generate unit name from device path: %m"); |
628c89cc LP |
368 | |
369 | u = manager_get_unit(m, e); | |
38b9b72e LP |
370 | if (u) { |
371 | /* The device unit can still be present even if the device was unplugged: a mount unit can reference it hence | |
372 | * preventing the GC to have garbaged it. That's desired since the device unit may have a dependency on the | |
373 | * mount unit which was added during the loading of the later. */ | |
374 | if (dev && DEVICE(u)->state == DEVICE_PLUGGED) { | |
375 | ||
376 | /* This unit is in plugged state: we're sure it's attached to a device. */ | |
377 | if (!path_equal(DEVICE(u)->sysfs, sysfs)) { | |
378 | log_unit_debug(u, "Dev %s appeared twice with different sysfs paths %s and %s", | |
379 | e, DEVICE(u)->sysfs, sysfs); | |
380 | return -EEXIST; | |
381 | } | |
ac9d396b | 382 | } |
25ac040b | 383 | |
38b9b72e LP |
384 | delete = false; |
385 | ||
386 | /* Let's remove all dependencies generated due to udev properties. We'll readd whatever is configured | |
387 | * now below. */ | |
388 | unit_remove_dependencies(u, UNIT_DEPENDENCY_UDEV); | |
389 | } else { | |
aab14b13 LP |
390 | delete = true; |
391 | ||
a581e45a | 392 | r = unit_new_for_name(m, sizeof(Device), e, &u); |
7d17cfbc | 393 | if (r < 0) |
25ac040b LP |
394 | goto fail; |
395 | ||
ee6cb288 | 396 | unit_add_to_load_queue(u); |
38b9b72e | 397 | } |
ee6cb288 LP |
398 | |
399 | /* If this was created via some dependency and has not | |
400 | * actually been seen yet ->sysfs will not be | |
401 | * initialized. Hence initialize it if necessary. */ | |
2005219f MP |
402 | if (sysfs) { |
403 | r = device_set_sysfs(DEVICE(u), sysfs); | |
404 | if (r < 0) | |
405 | goto fail; | |
ee6cb288 | 406 | |
2005219f | 407 | (void) device_update_description(u, dev, path); |
aab14b13 | 408 | |
2005219f MP |
409 | /* The additional systemd udev properties we only interpret |
410 | * for the main object */ | |
411 | if (main) | |
412 | (void) device_add_udev_wants(u, dev); | |
413 | } | |
25ac040b | 414 | |
eef85c4a LP |
415 | /* So the user wants the mount units to be bound to the device but a mount unit might has been seen by systemd |
416 | * before the device appears on its radar. In this case the device unit is partially initialized and includes | |
417 | * the deps on the mount unit but at that time the "bind mounts" flag wasn't not present. Fix this up now. */ | |
40b1a32c | 418 | if (dev && device_is_bound_by_mounts(DEVICE(u), dev)) |
ebc8968b | 419 | device_upgrade_mount_deps(u); |
f94ea366 | 420 | |
38b9b72e | 421 | /* Note that this won't dispatch the load queue, the caller has to do that if needed and appropriate */ |
f1421cc6 | 422 | |
c1e1601e | 423 | unit_add_to_dbus_queue(u); |
25ac040b LP |
424 | return 0; |
425 | ||
426 | fail: | |
f2341e0a | 427 | log_unit_warning_errno(u, r, "Failed to set up device unit: %m"); |
ee5f3479 | 428 | |
c9d5c9c0 | 429 | if (delete) |
25ac040b | 430 | unit_free(u); |
ee5f3479 | 431 | |
25ac040b LP |
432 | return r; |
433 | } | |
434 | ||
628c89cc | 435 | static int device_process_new(Manager *m, struct udev_device *dev) { |
f1421cc6 | 436 | const char *sysfs, *dn, *alias; |
8fe914ec | 437 | struct udev_list_entry *item = NULL, *first = NULL; |
003ac9d0 | 438 | int r; |
8fe914ec LP |
439 | |
440 | assert(m); | |
441 | ||
718db961 LP |
442 | sysfs = udev_device_get_syspath(dev); |
443 | if (!sysfs) | |
f1421cc6 | 444 | return 0; |
8fe914ec LP |
445 | |
446 | /* Add the main unit named after the sysfs path */ | |
628c89cc | 447 | r = device_setup_unit(m, dev, sysfs, true); |
003ac9d0 HH |
448 | if (r < 0) |
449 | return r; | |
8fe914ec LP |
450 | |
451 | /* Add an additional unit for the device node */ | |
f1421cc6 LP |
452 | dn = udev_device_get_devnode(dev); |
453 | if (dn) | |
628c89cc | 454 | (void) device_setup_unit(m, dev, dn, false); |
8fe914ec LP |
455 | |
456 | /* Add additional units for all symlinks */ | |
457 | first = udev_device_get_devlinks_list_entry(dev); | |
458 | udev_list_entry_foreach(item, first) { | |
459 | const char *p; | |
5845b46b | 460 | struct stat st; |
8fe914ec LP |
461 | |
462 | /* Don't bother with the /dev/block links */ | |
463 | p = udev_list_entry_get_name(item); | |
464 | ||
465 | if (path_startswith(p, "/dev/block/") || | |
466 | path_startswith(p, "/dev/char/")) | |
467 | continue; | |
468 | ||
5845b46b LP |
469 | /* Verify that the symlink in the FS actually belongs |
470 | * to this device. This is useful to deal with | |
471 | * conflicting devices, e.g. when two disks want the | |
472 | * same /dev/disk/by-label/xxx link because they have | |
473 | * the same label. We want to make sure that the same | |
474 | * device that won the symlink wins in systemd, so we | |
ee33e53a | 475 | * check the device node major/minor */ |
5845b46b LP |
476 | if (stat(p, &st) >= 0) |
477 | if ((!S_ISBLK(st.st_mode) && !S_ISCHR(st.st_mode)) || | |
478 | st.st_rdev != udev_device_get_devnum(dev)) | |
479 | continue; | |
480 | ||
628c89cc | 481 | (void) device_setup_unit(m, dev, p, false); |
8fe914ec LP |
482 | } |
483 | ||
f1421cc6 LP |
484 | /* Add additional units for all explicitly configured |
485 | * aliases */ | |
486 | alias = udev_device_get_property_value(dev, "SYSTEMD_ALIAS"); | |
ceed8f0c | 487 | for (;;) { |
8fb242ab | 488 | _cleanup_free_ char *word = NULL; |
8fe914ec | 489 | |
ceed8f0c ZJS |
490 | r = extract_first_word(&alias, &word, NULL, EXTRACT_QUOTES); |
491 | if (r == 0) | |
492 | return 0; | |
493 | if (r == -ENOMEM) | |
494 | return log_oom(); | |
495 | if (r < 0) | |
496 | return log_warning_errno(r, "Failed to add parse SYSTEMD_ALIAS for %s: %m", sysfs); | |
f1421cc6 | 497 | |
ceed8f0c ZJS |
498 | if (path_is_absolute(word)) |
499 | (void) device_setup_unit(m, dev, word, false); | |
500 | else | |
501 | log_warning("SYSTEMD_ALIAS for %s is not an absolute path, ignoring: %s", sysfs, word); | |
8fe914ec | 502 | } |
8fe914ec LP |
503 | } |
504 | ||
628c89cc | 505 | static void device_update_found_one(Device *d, bool add, DeviceFound found, bool now) { |
f6200941 | 506 | DeviceFound n, previous; |
628c89cc LP |
507 | |
508 | assert(d); | |
509 | ||
510 | n = add ? (d->found | found) : (d->found & ~found); | |
511 | if (n == d->found) | |
512 | return; | |
513 | ||
f6200941 | 514 | previous = d->found; |
628c89cc LP |
515 | d->found = n; |
516 | ||
f6200941 LP |
517 | if (!now) |
518 | return; | |
519 | ||
4b58153d LP |
520 | /* Didn't exist before, but does now? if so, generate a new invocation ID for it */ |
521 | if (previous == DEVICE_NOT_FOUND && d->found != DEVICE_NOT_FOUND) | |
522 | (void) unit_acquire_invocation_id(UNIT(d)); | |
523 | ||
f6200941 LP |
524 | if (d->found & DEVICE_FOUND_UDEV) |
525 | /* When the device is known to udev we consider it | |
526 | * plugged. */ | |
527 | device_set_state(d, DEVICE_PLUGGED); | |
528 | else if (d->found != DEVICE_NOT_FOUND && (previous & DEVICE_FOUND_UDEV) == 0) | |
529 | /* If the device has not been seen by udev yet, but is | |
530 | * now referenced by the kernel, then we assume the | |
531 | * kernel knows it now, and udev might soon too. */ | |
532 | device_set_state(d, DEVICE_TENTATIVE); | |
05e33aa1 | 533 | else { |
f6200941 LP |
534 | /* If nobody sees the device, or if the device was |
535 | * previously seen by udev and now is only referenced | |
536 | * from the kernel, then we consider the device is | |
537 | * gone, the kernel just hasn't noticed it yet. */ | |
05e33aa1 | 538 | |
f6200941 | 539 | device_set_state(d, DEVICE_DEAD); |
05e33aa1 MS |
540 | device_unset_sysfs(d); |
541 | } | |
542 | ||
628c89cc LP |
543 | } |
544 | ||
545 | static int device_update_found_by_sysfs(Manager *m, const char *sysfs, bool add, DeviceFound found, bool now) { | |
cc0df6cc | 546 | Device *d, *l, *n; |
25ac040b LP |
547 | |
548 | assert(m); | |
628c89cc | 549 | assert(sysfs); |
25ac040b | 550 | |
628c89cc LP |
551 | if (found == DEVICE_NOT_FOUND) |
552 | return 0; | |
25ac040b | 553 | |
f1421cc6 | 554 | l = hashmap_get(m->devices_by_sysfs, sysfs); |
cc0df6cc | 555 | LIST_FOREACH_SAFE(same_sysfs, d, n, l) |
628c89cc LP |
556 | device_update_found_one(d, add, found, now); |
557 | ||
558 | return 0; | |
25ac040b LP |
559 | } |
560 | ||
628c89cc LP |
561 | static int device_update_found_by_name(Manager *m, const char *path, bool add, DeviceFound found, bool now) { |
562 | _cleanup_free_ char *e = NULL; | |
563 | Unit *u; | |
7410616c | 564 | int r; |
f94ea366 LP |
565 | |
566 | assert(m); | |
628c89cc | 567 | assert(path); |
f94ea366 | 568 | |
628c89cc LP |
569 | if (found == DEVICE_NOT_FOUND) |
570 | return 0; | |
f94ea366 | 571 | |
7410616c LP |
572 | r = unit_name_from_path(path, ".device", &e); |
573 | if (r < 0) | |
574 | return log_error_errno(r, "Failed to generate unit name from device path: %m"); | |
f94ea366 | 575 | |
628c89cc LP |
576 | u = manager_get_unit(m, e); |
577 | if (!u) | |
578 | return 0; | |
579 | ||
580 | device_update_found_one(DEVICE(u), add, found, now); | |
f94ea366 LP |
581 | return 0; |
582 | } | |
583 | ||
f1421cc6 LP |
584 | static bool device_is_ready(struct udev_device *dev) { |
585 | const char *ready; | |
586 | ||
587 | assert(dev); | |
588 | ||
589 | ready = udev_device_get_property_value(dev, "SYSTEMD_READY"); | |
590 | if (!ready) | |
591 | return true; | |
592 | ||
593 | return parse_boolean(ready) != 0; | |
594 | } | |
595 | ||
a7f241db LP |
596 | static Unit *device_following(Unit *u) { |
597 | Device *d = DEVICE(u); | |
598 | Device *other, *first = NULL; | |
599 | ||
600 | assert(d); | |
601 | ||
ac155bb8 | 602 | if (startswith(u->id, "sys-")) |
a7f241db LP |
603 | return NULL; |
604 | ||
605 | /* Make everybody follow the unit that's named after the sysfs path */ | |
606 | for (other = d->same_sysfs_next; other; other = other->same_sysfs_next) | |
1124fe6f | 607 | if (startswith(UNIT(other)->id, "sys-")) |
a7f241db LP |
608 | return UNIT(other); |
609 | ||
610 | for (other = d->same_sysfs_prev; other; other = other->same_sysfs_prev) { | |
1124fe6f | 611 | if (startswith(UNIT(other)->id, "sys-")) |
a7f241db LP |
612 | return UNIT(other); |
613 | ||
614 | first = other; | |
615 | } | |
616 | ||
617 | return UNIT(first); | |
618 | } | |
619 | ||
f1421cc6 LP |
620 | static int device_following_set(Unit *u, Set **_set) { |
621 | Device *d = DEVICE(u), *other; | |
622 | Set *set; | |
6210e7fc LP |
623 | int r; |
624 | ||
625 | assert(d); | |
f1421cc6 | 626 | assert(_set); |
6210e7fc | 627 | |
f1421cc6 LP |
628 | if (LIST_JUST_US(same_sysfs, d)) { |
629 | *_set = NULL; | |
6210e7fc LP |
630 | return 0; |
631 | } | |
632 | ||
d5099efc | 633 | set = set_new(NULL); |
f1421cc6 | 634 | if (!set) |
6210e7fc LP |
635 | return -ENOMEM; |
636 | ||
f1421cc6 LP |
637 | LIST_FOREACH_AFTER(same_sysfs, other, d) { |
638 | r = set_put(set, other); | |
639 | if (r < 0) | |
6210e7fc | 640 | goto fail; |
f1421cc6 | 641 | } |
6210e7fc | 642 | |
f1421cc6 LP |
643 | LIST_FOREACH_BEFORE(same_sysfs, other, d) { |
644 | r = set_put(set, other); | |
645 | if (r < 0) | |
6210e7fc | 646 | goto fail; |
f1421cc6 | 647 | } |
6210e7fc | 648 | |
f1421cc6 | 649 | *_set = set; |
6210e7fc LP |
650 | return 1; |
651 | ||
652 | fail: | |
f1421cc6 | 653 | set_free(set); |
6210e7fc LP |
654 | return r; |
655 | } | |
656 | ||
25ac040b LP |
657 | static void device_shutdown(Manager *m) { |
658 | assert(m); | |
659 | ||
718db961 LP |
660 | m->udev_event_source = sd_event_source_unref(m->udev_event_source); |
661 | ||
0dfb0a0a YW |
662 | if (m->udev_monitor) |
663 | m->udev_monitor = udev_monitor_unref(m->udev_monitor); | |
f94ea366 | 664 | |
525d3cc7 | 665 | m->devices_by_sysfs = hashmap_free(m->devices_by_sysfs); |
25ac040b LP |
666 | } |
667 | ||
ba64af90 | 668 | static void device_enumerate(Manager *m) { |
718db961 | 669 | _cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL; |
25ac040b | 670 | struct udev_list_entry *item = NULL, *first = NULL; |
718db961 | 671 | int r; |
25ac040b LP |
672 | |
673 | assert(m); | |
674 | ||
9670d583 | 675 | if (!m->udev_monitor) { |
718db961 LP |
676 | m->udev_monitor = udev_monitor_new_from_netlink(m->udev, "udev"); |
677 | if (!m->udev_monitor) { | |
ba64af90 | 678 | log_oom(); |
a16e1123 LP |
679 | goto fail; |
680 | } | |
f94ea366 | 681 | |
47ae6e67 LP |
682 | /* This will fail if we are unprivileged, but that |
683 | * should not matter much, as user instances won't run | |
684 | * during boot. */ | |
8fa158e7 | 685 | (void) udev_monitor_set_receive_buffer_size(m->udev_monitor, 128*1024*1024); |
99448c1f | 686 | |
718db961 | 687 | r = udev_monitor_filter_add_match_tag(m->udev_monitor, "systemd"); |
ba64af90 LP |
688 | if (r < 0) { |
689 | log_error_errno(r, "Failed to add udev tag match: %m"); | |
e1ce2c27 | 690 | goto fail; |
ba64af90 | 691 | } |
e1ce2c27 | 692 | |
718db961 | 693 | r = udev_monitor_enable_receiving(m->udev_monitor); |
ba64af90 LP |
694 | if (r < 0) { |
695 | log_error_errno(r, "Failed to enable udev event reception: %m"); | |
a16e1123 | 696 | goto fail; |
ba64af90 | 697 | } |
f94ea366 | 698 | |
151b9b96 | 699 | r = sd_event_add_io(m->event, &m->udev_event_source, udev_monitor_get_fd(m->udev_monitor), EPOLLIN, device_dispatch_io, m); |
ba64af90 LP |
700 | if (r < 0) { |
701 | log_error_errno(r, "Failed to watch udev file descriptor: %m"); | |
718db961 | 702 | goto fail; |
ba64af90 | 703 | } |
7dfbe2e3 TG |
704 | |
705 | (void) sd_event_source_set_description(m->udev_event_source, "device"); | |
a16e1123 | 706 | } |
f94ea366 | 707 | |
718db961 LP |
708 | e = udev_enumerate_new(m->udev); |
709 | if (!e) { | |
ba64af90 | 710 | log_oom(); |
4f2d528d LP |
711 | goto fail; |
712 | } | |
718db961 LP |
713 | |
714 | r = udev_enumerate_add_match_tag(e, "systemd"); | |
ba64af90 LP |
715 | if (r < 0) { |
716 | log_error_errno(r, "Failed to create udev tag enumeration: %m"); | |
e1ce2c27 | 717 | goto fail; |
ba64af90 | 718 | } |
25ac040b | 719 | |
e1202047 | 720 | r = udev_enumerate_add_match_is_initialized(e); |
ba64af90 LP |
721 | if (r < 0) { |
722 | log_error_errno(r, "Failed to install initialization match into enumeration: %m"); | |
e1202047 | 723 | goto fail; |
ba64af90 | 724 | } |
e1202047 | 725 | |
718db961 | 726 | r = udev_enumerate_scan_devices(e); |
ba64af90 LP |
727 | if (r < 0) { |
728 | log_error_errno(r, "Failed to enumerate devices: %m"); | |
4f2d528d | 729 | goto fail; |
ba64af90 | 730 | } |
25ac040b | 731 | |
4f2d528d | 732 | first = udev_enumerate_get_list_entry(e); |
628c89cc LP |
733 | udev_list_entry_foreach(item, first) { |
734 | _cleanup_udev_device_unref_ struct udev_device *dev = NULL; | |
735 | const char *sysfs; | |
736 | ||
737 | sysfs = udev_list_entry_get_name(item); | |
738 | ||
739 | dev = udev_device_new_from_syspath(m->udev, sysfs); | |
740 | if (!dev) { | |
741 | log_oom(); | |
742 | continue; | |
743 | } | |
744 | ||
745 | if (!device_is_ready(dev)) | |
746 | continue; | |
747 | ||
748 | (void) device_process_new(m, dev); | |
749 | ||
750 | device_update_found_by_sysfs(m, sysfs, true, DEVICE_FOUND_UDEV, false); | |
751 | } | |
25ac040b | 752 | |
ba64af90 | 753 | return; |
25ac040b LP |
754 | |
755 | fail: | |
25ac040b | 756 | device_shutdown(m); |
5cb5a6ff LP |
757 | } |
758 | ||
718db961 LP |
759 | static int device_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) { |
760 | _cleanup_udev_device_unref_ struct udev_device *dev = NULL; | |
718db961 | 761 | Manager *m = userdata; |
628c89cc | 762 | const char *action, *sysfs; |
718db961 | 763 | int r; |
f94ea366 LP |
764 | |
765 | assert(m); | |
99448c1f | 766 | |
718db961 | 767 | if (revents != EPOLLIN) { |
99448c1f KS |
768 | static RATELIMIT_DEFINE(limit, 10*USEC_PER_SEC, 5); |
769 | ||
770 | if (!ratelimit_test(&limit)) | |
56f64d95 | 771 | log_error_errno(errno, "Failed to get udev event: %m"); |
718db961 LP |
772 | if (!(revents & EPOLLIN)) |
773 | return 0; | |
99448c1f | 774 | } |
f94ea366 | 775 | |
718db961 LP |
776 | /* |
777 | * libudev might filter-out devices which pass the bloom | |
778 | * filter, so getting NULL here is not necessarily an error. | |
779 | */ | |
780 | dev = udev_monitor_receive_device(m->udev_monitor); | |
781 | if (!dev) | |
782 | return 0; | |
f94ea366 | 783 | |
628c89cc LP |
784 | sysfs = udev_device_get_syspath(dev); |
785 | if (!sysfs) { | |
786 | log_error("Failed to get udev sys path."); | |
787 | return 0; | |
788 | } | |
789 | ||
718db961 LP |
790 | action = udev_device_get_action(dev); |
791 | if (!action) { | |
f94ea366 | 792 | log_error("Failed to get udev action string."); |
718db961 | 793 | return 0; |
f94ea366 LP |
794 | } |
795 | ||
f332611a | 796 | if (streq(action, "change")) { |
f332611a | 797 | Unit *u; |
bf70ff2c | 798 | Device *d, *l, *n; |
f332611a | 799 | |
bf70ff2c JR |
800 | l = hashmap_get(m->devices_by_sysfs, sysfs); |
801 | LIST_FOREACH_SAFE(same_sysfs, d, n, l) { | |
802 | u = &d->meta; | |
f332611a JR |
803 | if (u && UNIT_VTABLE(u)->active_state(u) == UNIT_ACTIVE) { |
804 | r = manager_propagate_reload(m, u, JOB_REPLACE, NULL); | |
805 | if (r < 0) | |
806 | log_error_errno(r, "Failed to propagate reload: %m"); | |
807 | } | |
808 | } | |
809 | } | |
810 | ||
811 | /* A change event can signal that a device is becoming ready, in particular if | |
812 | * the device is using the SYSTEMD_READY logic in udev | |
813 | * so we need to reach the else block of the follwing if, even for change events */ | |
6d445911 | 814 | if (streq(action, "remove")) { |
628c89cc | 815 | r = swap_process_device_remove(m, dev); |
9670d583 | 816 | if (r < 0) |
da927ba9 | 817 | log_error_errno(r, "Failed to process swap device remove event: %m"); |
9670d583 | 818 | |
628c89cc LP |
819 | /* If we get notified that a device was removed by |
820 | * udev, then it's completely gone, hence unset all | |
821 | * found bits */ | |
822 | device_update_found_by_sysfs(m, sysfs, false, DEVICE_FOUND_UDEV|DEVICE_FOUND_MOUNT|DEVICE_FOUND_SWAP, true); | |
f1421cc6 | 823 | |
628c89cc LP |
824 | } else if (device_is_ready(dev)) { |
825 | ||
826 | (void) device_process_new(m, dev); | |
827 | ||
828 | r = swap_process_device_new(m, dev); | |
9670d583 | 829 | if (r < 0) |
da927ba9 | 830 | log_error_errno(r, "Failed to process swap device new event: %m"); |
9670d583 | 831 | |
f1421cc6 LP |
832 | manager_dispatch_load_queue(m); |
833 | ||
628c89cc LP |
834 | /* The device is found now, set the udev found bit */ |
835 | device_update_found_by_sysfs(m, sysfs, true, DEVICE_FOUND_UDEV, true); | |
836 | ||
837 | } else { | |
838 | /* The device is nominally around, but not ready for | |
839 | * us. Hence unset the udev bit, but leave the rest | |
840 | * around. */ | |
841 | ||
842 | device_update_found_by_sysfs(m, sysfs, false, DEVICE_FOUND_UDEV, true); | |
f94ea366 LP |
843 | } |
844 | ||
718db961 | 845 | return 0; |
f94ea366 LP |
846 | } |
847 | ||
1c2e9646 | 848 | static bool device_supported(void) { |
0faacd47 | 849 | static int read_only = -1; |
0faacd47 LP |
850 | |
851 | /* If /sys is read-only we don't support device units, and any | |
852 | * attempts to start one should fail immediately. */ | |
853 | ||
854 | if (read_only < 0) | |
855 | read_only = path_is_read_only_fs("/sys"); | |
856 | ||
857 | return read_only <= 0; | |
858 | } | |
859 | ||
628c89cc LP |
860 | int device_found_node(Manager *m, const char *node, bool add, DeviceFound found, bool now) { |
861 | _cleanup_udev_device_unref_ struct udev_device *dev = NULL; | |
862 | struct stat st; | |
863 | ||
864 | assert(m); | |
865 | assert(node); | |
866 | ||
4c6d20de LP |
867 | if (!device_supported()) |
868 | return 0; | |
869 | ||
628c89cc LP |
870 | /* This is called whenever we find a device referenced in |
871 | * /proc/swaps or /proc/self/mounts. Such a device might be | |
872 | * mounted/enabled at a time where udev has not finished | |
873 | * probing it yet, and we thus haven't learned about it | |
874 | * yet. In this case we will set the device unit to | |
875 | * "tentative" state. */ | |
876 | ||
877 | if (add) { | |
878 | if (!path_startswith(node, "/dev")) | |
879 | return 0; | |
880 | ||
f6200941 LP |
881 | /* We make an extra check here, if the device node |
882 | * actually exists. If it's missing, then this is an | |
883 | * indication that device was unplugged but is still | |
884 | * referenced in /proc/swaps or | |
885 | * /proc/self/mountinfo. Note that this check doesn't | |
886 | * really cover all cases where a device might be gone | |
887 | * away, since drives that can have a medium inserted | |
888 | * will still have a device node even when the medium | |
889 | * is not there... */ | |
890 | ||
2005219f MP |
891 | if (stat(node, &st) >= 0) { |
892 | if (!S_ISBLK(st.st_mode) && !S_ISCHR(st.st_mode)) | |
628c89cc LP |
893 | return 0; |
894 | ||
2005219f MP |
895 | dev = udev_device_new_from_devnum(m->udev, S_ISBLK(st.st_mode) ? 'b' : 'c', st.st_rdev); |
896 | if (!dev && errno != ENOENT) | |
897 | return log_error_errno(errno, "Failed to get udev device from devnum %u:%u: %m", major(st.st_rdev), minor(st.st_rdev)); | |
628c89cc | 898 | |
2005219f MP |
899 | } else if (errno != ENOENT) |
900 | return log_error_errno(errno, "Failed to stat device node file %s: %m", node); | |
628c89cc LP |
901 | |
902 | /* If the device is known in the kernel and newly | |
903 | * appeared, then we'll create a device unit for it, | |
904 | * under the name referenced in /proc/swaps or | |
905 | * /proc/self/mountinfo. */ | |
906 | ||
907 | (void) device_setup_unit(m, dev, node, false); | |
908 | } | |
909 | ||
910 | /* Update the device unit's state, should it exist */ | |
911 | return device_update_found_by_name(m, node, add, found, now); | |
912 | } | |
913 | ||
ebc8968b FB |
914 | bool device_shall_be_bound_by(Unit *device, Unit *u) { |
915 | ||
916 | if (u->type != UNIT_MOUNT) | |
917 | return false; | |
918 | ||
919 | return DEVICE(device)->bind_mounts; | |
920 | } | |
921 | ||
87f0e418 | 922 | const UnitVTable device_vtable = { |
7d17cfbc | 923 | .object_size = sizeof(Device), |
f975e971 LP |
924 | .sections = |
925 | "Unit\0" | |
926 | "Device\0" | |
927 | "Install\0", | |
5cb5a6ff | 928 | |
c5a97ed1 LP |
929 | .gc_jobs = true, |
930 | ||
faf919f1 | 931 | .init = device_init, |
034c6ed7 | 932 | .done = device_done, |
718db961 LP |
933 | .load = unit_load_fragment_and_dropin_optional, |
934 | ||
f50e0a01 LP |
935 | .coldplug = device_coldplug, |
936 | ||
f6200941 LP |
937 | .serialize = device_serialize, |
938 | .deserialize_item = device_deserialize_item, | |
939 | ||
5cb5a6ff LP |
940 | .dump = device_dump, |
941 | ||
f50e0a01 | 942 | .active_state = device_active_state, |
10a94420 | 943 | .sub_state_to_string = device_sub_state_to_string, |
25ac040b | 944 | |
718db961 | 945 | .bus_vtable = bus_device_vtable, |
4139c1b2 | 946 | |
a7f241db | 947 | .following = device_following, |
6210e7fc | 948 | .following_set = device_following_set, |
a7f241db | 949 | |
f50e0a01 | 950 | .enumerate = device_enumerate, |
c6918296 | 951 | .shutdown = device_shutdown, |
0faacd47 | 952 | .supported = device_supported, |
c6918296 MS |
953 | |
954 | .status_message_formats = { | |
955 | .starting_stopping = { | |
956 | [0] = "Expecting device %s...", | |
957 | }, | |
958 | .finished_start_job = { | |
959 | [JOB_DONE] = "Found device %s.", | |
960 | [JOB_TIMEOUT] = "Timed out waiting for device %s.", | |
961 | }, | |
962 | }, | |
5cb5a6ff | 963 | }; |