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a7334b09 LP |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2010 Lennart Poettering | |
5 | ||
6 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
7 | under the terms of the GNU Lesser General Public License as published by |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
a7334b09 LP |
9 | (at your option) any later version. |
10 | ||
11 | systemd is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 14 | Lesser General Public License for more details. |
a7334b09 | 15 | |
5430f7f2 | 16 | You should have received a copy of the GNU Lesser General Public License |
a7334b09 LP |
17 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
18 | ***/ | |
19 | ||
25ac040b | 20 | #include <errno.h> |
f94ea366 | 21 | #include <sys/epoll.h> |
25ac040b | 22 | |
b4bbcaa9 TA |
23 | #include "libudev.h" |
24 | ||
b5efdb8a | 25 | #include "alloc-util.h" |
4139c1b2 | 26 | #include "dbus-device.h" |
6bedfcbb | 27 | #include "device.h" |
07630cea | 28 | #include "log.h" |
6bedfcbb | 29 | #include "parse-util.h" |
9eb977db | 30 | #include "path-util.h" |
8fcde012 | 31 | #include "stat-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. */ | |
d9732d78 | 115 | u->job_running_timeout = u->manager->default_timeout_start_usec; |
c8f4d764 | 116 | |
f1421cc6 | 117 | u->ignore_on_isolate = true; |
faf919f1 LP |
118 | } |
119 | ||
87f0e418 LP |
120 | static void device_done(Unit *u) { |
121 | Device *d = DEVICE(u); | |
034c6ed7 LP |
122 | |
123 | assert(d); | |
e537352b | 124 | |
8fe914ec | 125 | device_unset_sysfs(d); |
e537352b LP |
126 | } |
127 | ||
f50e0a01 LP |
128 | static void device_set_state(Device *d, DeviceState state) { |
129 | DeviceState old_state; | |
130 | assert(d); | |
5cb5a6ff | 131 | |
f50e0a01 LP |
132 | old_state = d->state; |
133 | d->state = state; | |
5cb5a6ff | 134 | |
e537352b | 135 | if (state != old_state) |
f2341e0a | 136 | log_unit_debug(UNIT(d), "Changed %s -> %s", device_state_to_string(old_state), device_state_to_string(state)); |
f50e0a01 | 137 | |
e2f3b44c | 138 | unit_notify(UNIT(d), state_translation_table[old_state], state_translation_table[state], true); |
f50e0a01 LP |
139 | } |
140 | ||
be847e82 | 141 | static int device_coldplug(Unit *u) { |
f50e0a01 LP |
142 | Device *d = DEVICE(u); |
143 | ||
144 | assert(d); | |
145 | assert(d->state == DEVICE_DEAD); | |
146 | ||
628c89cc LP |
147 | if (d->found & DEVICE_FOUND_UDEV) |
148 | /* If udev says the device is around, it's around */ | |
73608ed9 | 149 | device_set_state(d, DEVICE_PLUGGED); |
f6200941 | 150 | else if (d->found != DEVICE_NOT_FOUND && d->deserialized_state != DEVICE_PLUGGED) |
628c89cc | 151 | /* If a device is found in /proc/self/mountinfo or |
f6200941 LP |
152 | * /proc/swaps, and was not yet announced via udev, |
153 | * it's "tentatively" around. */ | |
628c89cc | 154 | device_set_state(d, DEVICE_TENTATIVE); |
f50e0a01 LP |
155 | |
156 | return 0; | |
157 | } | |
158 | ||
f6200941 LP |
159 | static int device_serialize(Unit *u, FILE *f, FDSet *fds) { |
160 | Device *d = DEVICE(u); | |
161 | ||
162 | assert(u); | |
163 | assert(f); | |
164 | assert(fds); | |
165 | ||
166 | unit_serialize_item(u, f, "state", device_state_to_string(d->state)); | |
0108f6ec DM |
167 | |
168 | return 0; | |
f6200941 LP |
169 | } |
170 | ||
171 | static int device_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
172 | Device *d = DEVICE(u); | |
173 | ||
174 | assert(u); | |
175 | assert(key); | |
176 | assert(value); | |
177 | assert(fds); | |
178 | ||
179 | if (streq(key, "state")) { | |
180 | DeviceState state; | |
181 | ||
182 | state = device_state_from_string(value); | |
183 | if (state < 0) | |
f2341e0a | 184 | log_unit_debug(u, "Failed to parse state value: %s", value); |
f6200941 LP |
185 | else |
186 | d->deserialized_state = state; | |
187 | } else | |
f2341e0a | 188 | log_unit_debug(u, "Unknown serialization key: %s", key); |
f6200941 LP |
189 | |
190 | return 0; | |
191 | } | |
192 | ||
f50e0a01 | 193 | static void device_dump(Unit *u, FILE *f, const char *prefix) { |
25ac040b | 194 | Device *d = DEVICE(u); |
5cb5a6ff | 195 | |
25ac040b | 196 | assert(d); |
5cb5a6ff LP |
197 | |
198 | fprintf(f, | |
25ac040b LP |
199 | "%sDevice State: %s\n" |
200 | "%sSysfs Path: %s\n", | |
a16e1123 | 201 | prefix, device_state_to_string(d->state), |
f50e0a01 LP |
202 | prefix, strna(d->sysfs)); |
203 | } | |
204 | ||
44a6b1b6 | 205 | _pure_ static UnitActiveState device_active_state(Unit *u) { |
f50e0a01 LP |
206 | assert(u); |
207 | ||
208 | return state_translation_table[DEVICE(u)->state]; | |
25ac040b LP |
209 | } |
210 | ||
44a6b1b6 | 211 | _pure_ static const char *device_sub_state_to_string(Unit *u) { |
10a94420 LP |
212 | assert(u); |
213 | ||
a16e1123 | 214 | return device_state_to_string(DEVICE(u)->state); |
10a94420 LP |
215 | } |
216 | ||
628c89cc | 217 | static int device_update_description(Unit *u, struct udev_device *dev, const char *path) { |
965e5c5d | 218 | const char *model; |
628c89cc | 219 | int r; |
965e5c5d LP |
220 | |
221 | assert(u); | |
222 | assert(dev); | |
223 | assert(path); | |
224 | ||
225 | model = udev_device_get_property_value(dev, "ID_MODEL_FROM_DATABASE"); | |
226 | if (!model) | |
227 | model = udev_device_get_property_value(dev, "ID_MODEL"); | |
228 | ||
229 | if (model) { | |
230 | const char *label; | |
231 | ||
232 | /* Try to concatenate the device model string with a label, if there is one */ | |
233 | label = udev_device_get_property_value(dev, "ID_FS_LABEL"); | |
234 | if (!label) | |
235 | label = udev_device_get_property_value(dev, "ID_PART_ENTRY_NAME"); | |
236 | if (!label) | |
237 | label = udev_device_get_property_value(dev, "ID_PART_ENTRY_NUMBER"); | |
238 | ||
239 | if (label) { | |
240 | _cleanup_free_ char *j; | |
241 | ||
605405c6 | 242 | j = strjoin(model, " ", label); |
965e5c5d | 243 | if (j) |
628c89cc | 244 | r = unit_set_description(u, j); |
c43b2132 TA |
245 | else |
246 | r = -ENOMEM; | |
628c89cc LP |
247 | } else |
248 | r = unit_set_description(u, model); | |
249 | } else | |
250 | r = unit_set_description(u, path); | |
965e5c5d | 251 | |
628c89cc | 252 | if (r < 0) |
f2341e0a | 253 | log_unit_error_errno(u, r, "Failed to set device description: %m"); |
965e5c5d | 254 | |
628c89cc | 255 | return r; |
965e5c5d LP |
256 | } |
257 | ||
258 | static int device_add_udev_wants(Unit *u, struct udev_device *dev) { | |
de040543 | 259 | const char *wants, *property; |
965e5c5d LP |
260 | int r; |
261 | ||
262 | assert(u); | |
263 | assert(dev); | |
264 | ||
463d0d15 | 265 | property = MANAGER_IS_USER(u->manager) ? "SYSTEMD_USER_WANTS" : "SYSTEMD_WANTS"; |
de040543 | 266 | |
b2fadec6 | 267 | wants = udev_device_get_property_value(dev, property); |
de040543 LP |
268 | if (!wants) |
269 | return 0; | |
270 | ||
271 | for (;;) { | |
ceed8f0c | 272 | _cleanup_free_ char *word = NULL, *k = NULL; |
965e5c5d | 273 | |
de040543 | 274 | r = extract_first_word(&wants, &word, NULL, EXTRACT_QUOTES); |
ceed8f0c ZJS |
275 | if (r == 0) |
276 | return 0; | |
277 | if (r == -ENOMEM) | |
278 | return log_oom(); | |
279 | if (r < 0) | |
dcebc9ba | 280 | return log_unit_error_errno(u, r, "Failed to parse property %s with value %s: %m", property, wants); |
965e5c5d | 281 | |
dcebc9ba LP |
282 | if (unit_name_is_valid(word, UNIT_NAME_TEMPLATE) && DEVICE(u)->sysfs) { |
283 | _cleanup_free_ char *escaped = NULL; | |
284 | ||
285 | /* If the unit name is specified as template, then automatically fill in the sysfs path of the | |
286 | * device as instance name, properly escaped. */ | |
287 | ||
288 | r = unit_name_path_escape(DEVICE(u)->sysfs, &escaped); | |
289 | if (r < 0) | |
290 | return log_unit_error_errno(u, r, "Failed to escape %s: %m", DEVICE(u)->sysfs); | |
291 | ||
292 | r = unit_name_replace_instance(word, escaped, &k); | |
293 | if (r < 0) | |
294 | return log_unit_error_errno(u, r, "Failed to build %s instance of template %s: %m", escaped, word); | |
295 | } else { | |
296 | /* If this is not a template, then let's mangle it so, that it becomes a valid unit name. */ | |
297 | ||
298 | r = unit_name_mangle(word, UNIT_NAME_NOGLOB, &k); | |
299 | if (r < 0) | |
300 | return log_unit_error_errno(u, r, "Failed to mangle unit name \"%s\": %m", word); | |
301 | } | |
965e5c5d | 302 | |
eef85c4a | 303 | r = unit_add_dependency_by_name(u, UNIT_WANTS, k, NULL, true, UNIT_DEPENDENCY_UDEV); |
965e5c5d | 304 | if (r < 0) |
de040543 | 305 | return log_unit_error_errno(u, r, "Failed to add Wants= dependency: %m"); |
965e5c5d | 306 | } |
965e5c5d LP |
307 | } |
308 | ||
40b1a32c | 309 | static bool device_is_bound_by_mounts(Device *d, struct udev_device *dev) { |
ebc8968b | 310 | const char *bound_by; |
40b1a32c | 311 | int r; |
ebc8968b FB |
312 | |
313 | assert(d); | |
314 | assert(dev); | |
315 | ||
316 | bound_by = udev_device_get_property_value(dev, "SYSTEMD_MOUNT_DEVICE_BOUND"); | |
40b1a32c LP |
317 | if (bound_by) { |
318 | r = parse_boolean(bound_by); | |
319 | if (r < 0) | |
320 | log_warning_errno(r, "Failed to parse SYSTEMD_MOUNT_DEVICE_BOUND='%s' udev property of %s, ignoring: %m", bound_by, strna(d->sysfs)); | |
ebc8968b | 321 | |
40b1a32c LP |
322 | d->bind_mounts = r > 0; |
323 | } else | |
324 | d->bind_mounts = false; | |
325 | ||
326 | return d->bind_mounts; | |
ebc8968b FB |
327 | } |
328 | ||
329 | static int device_upgrade_mount_deps(Unit *u) { | |
330 | Unit *other; | |
331 | Iterator i; | |
eef85c4a | 332 | void *v; |
ebc8968b FB |
333 | int r; |
334 | ||
eef85c4a LP |
335 | /* Let's upgrade Requires= to BindsTo= on us. (Used when SYSTEMD_MOUNT_DEVICE_BOUND is set) */ |
336 | ||
337 | HASHMAP_FOREACH_KEY(v, other, u->dependencies[UNIT_REQUIRED_BY], i) { | |
ebc8968b FB |
338 | if (other->type != UNIT_MOUNT) |
339 | continue; | |
340 | ||
eef85c4a | 341 | r = unit_add_dependency(other, UNIT_BINDS_TO, u, true, UNIT_DEPENDENCY_UDEV); |
ebc8968b FB |
342 | if (r < 0) |
343 | return r; | |
344 | } | |
345 | return 0; | |
346 | } | |
347 | ||
628c89cc LP |
348 | static int device_setup_unit(Manager *m, struct udev_device *dev, const char *path, bool main) { |
349 | _cleanup_free_ char *e = NULL; | |
2005219f | 350 | const char *sysfs = NULL; |
25ac040b | 351 | Unit *u = NULL; |
25ac040b | 352 | bool delete; |
965e5c5d | 353 | int r; |
25ac040b LP |
354 | |
355 | assert(m); | |
965e5c5d | 356 | assert(path); |
25ac040b | 357 | |
2005219f MP |
358 | if (dev) { |
359 | sysfs = udev_device_get_syspath(dev); | |
360 | if (!sysfs) | |
361 | return 0; | |
362 | } | |
7f275a9f | 363 | |
7410616c LP |
364 | r = unit_name_from_path(path, ".device", &e); |
365 | if (r < 0) | |
7f629b74 | 366 | return log_error_errno(r, "Failed to generate unit name from device path: %m"); |
628c89cc LP |
367 | |
368 | u = manager_get_unit(m, e); | |
38b9b72e LP |
369 | if (u) { |
370 | /* The device unit can still be present even if the device was unplugged: a mount unit can reference it hence | |
371 | * preventing the GC to have garbaged it. That's desired since the device unit may have a dependency on the | |
372 | * mount unit which was added during the loading of the later. */ | |
373 | if (dev && DEVICE(u)->state == DEVICE_PLUGGED) { | |
374 | ||
375 | /* This unit is in plugged state: we're sure it's attached to a device. */ | |
376 | if (!path_equal(DEVICE(u)->sysfs, sysfs)) { | |
377 | log_unit_debug(u, "Dev %s appeared twice with different sysfs paths %s and %s", | |
378 | e, DEVICE(u)->sysfs, sysfs); | |
379 | return -EEXIST; | |
380 | } | |
ac9d396b | 381 | } |
25ac040b | 382 | |
38b9b72e LP |
383 | delete = false; |
384 | ||
385 | /* Let's remove all dependencies generated due to udev properties. We'll readd whatever is configured | |
386 | * now below. */ | |
387 | unit_remove_dependencies(u, UNIT_DEPENDENCY_UDEV); | |
388 | } else { | |
aab14b13 LP |
389 | delete = true; |
390 | ||
a581e45a | 391 | r = unit_new_for_name(m, sizeof(Device), e, &u); |
7d17cfbc | 392 | if (r < 0) |
25ac040b LP |
393 | goto fail; |
394 | ||
ee6cb288 | 395 | unit_add_to_load_queue(u); |
38b9b72e | 396 | } |
ee6cb288 LP |
397 | |
398 | /* If this was created via some dependency and has not | |
399 | * actually been seen yet ->sysfs will not be | |
400 | * initialized. Hence initialize it if necessary. */ | |
2005219f MP |
401 | if (sysfs) { |
402 | r = device_set_sysfs(DEVICE(u), sysfs); | |
403 | if (r < 0) | |
404 | goto fail; | |
ee6cb288 | 405 | |
2005219f | 406 | (void) device_update_description(u, dev, path); |
aab14b13 | 407 | |
2005219f MP |
408 | /* The additional systemd udev properties we only interpret |
409 | * for the main object */ | |
410 | if (main) | |
411 | (void) device_add_udev_wants(u, dev); | |
412 | } | |
25ac040b | 413 | |
eef85c4a LP |
414 | /* So the user wants the mount units to be bound to the device but a mount unit might has been seen by systemd |
415 | * before the device appears on its radar. In this case the device unit is partially initialized and includes | |
416 | * the deps on the mount unit but at that time the "bind mounts" flag wasn't not present. Fix this up now. */ | |
40b1a32c | 417 | if (dev && device_is_bound_by_mounts(DEVICE(u), dev)) |
ebc8968b | 418 | device_upgrade_mount_deps(u); |
f94ea366 | 419 | |
38b9b72e | 420 | /* Note that this won't dispatch the load queue, the caller has to do that if needed and appropriate */ |
f1421cc6 | 421 | |
c1e1601e | 422 | unit_add_to_dbus_queue(u); |
25ac040b LP |
423 | return 0; |
424 | ||
425 | fail: | |
f2341e0a | 426 | log_unit_warning_errno(u, r, "Failed to set up device unit: %m"); |
ee5f3479 | 427 | |
c9d5c9c0 | 428 | if (delete) |
25ac040b | 429 | unit_free(u); |
ee5f3479 | 430 | |
25ac040b LP |
431 | return r; |
432 | } | |
433 | ||
628c89cc | 434 | static int device_process_new(Manager *m, struct udev_device *dev) { |
f1421cc6 | 435 | const char *sysfs, *dn, *alias; |
8fe914ec | 436 | struct udev_list_entry *item = NULL, *first = NULL; |
003ac9d0 | 437 | int r; |
8fe914ec LP |
438 | |
439 | assert(m); | |
440 | ||
718db961 LP |
441 | sysfs = udev_device_get_syspath(dev); |
442 | if (!sysfs) | |
f1421cc6 | 443 | return 0; |
8fe914ec LP |
444 | |
445 | /* Add the main unit named after the sysfs path */ | |
628c89cc | 446 | r = device_setup_unit(m, dev, sysfs, true); |
003ac9d0 HH |
447 | if (r < 0) |
448 | return r; | |
8fe914ec LP |
449 | |
450 | /* Add an additional unit for the device node */ | |
f1421cc6 LP |
451 | dn = udev_device_get_devnode(dev); |
452 | if (dn) | |
628c89cc | 453 | (void) device_setup_unit(m, dev, dn, false); |
8fe914ec LP |
454 | |
455 | /* Add additional units for all symlinks */ | |
456 | first = udev_device_get_devlinks_list_entry(dev); | |
457 | udev_list_entry_foreach(item, first) { | |
458 | const char *p; | |
5845b46b | 459 | struct stat st; |
8fe914ec LP |
460 | |
461 | /* Don't bother with the /dev/block links */ | |
462 | p = udev_list_entry_get_name(item); | |
463 | ||
464 | if (path_startswith(p, "/dev/block/") || | |
465 | path_startswith(p, "/dev/char/")) | |
466 | continue; | |
467 | ||
5845b46b LP |
468 | /* Verify that the symlink in the FS actually belongs |
469 | * to this device. This is useful to deal with | |
470 | * conflicting devices, e.g. when two disks want the | |
471 | * same /dev/disk/by-label/xxx link because they have | |
472 | * the same label. We want to make sure that the same | |
473 | * device that won the symlink wins in systemd, so we | |
ee33e53a | 474 | * check the device node major/minor */ |
5845b46b LP |
475 | if (stat(p, &st) >= 0) |
476 | if ((!S_ISBLK(st.st_mode) && !S_ISCHR(st.st_mode)) || | |
477 | st.st_rdev != udev_device_get_devnum(dev)) | |
478 | continue; | |
479 | ||
628c89cc | 480 | (void) device_setup_unit(m, dev, p, false); |
8fe914ec LP |
481 | } |
482 | ||
f1421cc6 LP |
483 | /* Add additional units for all explicitly configured |
484 | * aliases */ | |
485 | alias = udev_device_get_property_value(dev, "SYSTEMD_ALIAS"); | |
ceed8f0c | 486 | for (;;) { |
8fb242ab | 487 | _cleanup_free_ char *word = NULL; |
8fe914ec | 488 | |
ceed8f0c ZJS |
489 | r = extract_first_word(&alias, &word, NULL, EXTRACT_QUOTES); |
490 | if (r == 0) | |
491 | return 0; | |
492 | if (r == -ENOMEM) | |
493 | return log_oom(); | |
494 | if (r < 0) | |
495 | return log_warning_errno(r, "Failed to add parse SYSTEMD_ALIAS for %s: %m", sysfs); | |
f1421cc6 | 496 | |
ceed8f0c ZJS |
497 | if (path_is_absolute(word)) |
498 | (void) device_setup_unit(m, dev, word, false); | |
499 | else | |
500 | log_warning("SYSTEMD_ALIAS for %s is not an absolute path, ignoring: %s", sysfs, word); | |
8fe914ec | 501 | } |
8fe914ec LP |
502 | } |
503 | ||
628c89cc | 504 | static void device_update_found_one(Device *d, bool add, DeviceFound found, bool now) { |
f6200941 | 505 | DeviceFound n, previous; |
628c89cc LP |
506 | |
507 | assert(d); | |
508 | ||
509 | n = add ? (d->found | found) : (d->found & ~found); | |
510 | if (n == d->found) | |
511 | return; | |
512 | ||
f6200941 | 513 | previous = d->found; |
628c89cc LP |
514 | d->found = n; |
515 | ||
f6200941 LP |
516 | if (!now) |
517 | return; | |
518 | ||
4b58153d LP |
519 | /* Didn't exist before, but does now? if so, generate a new invocation ID for it */ |
520 | if (previous == DEVICE_NOT_FOUND && d->found != DEVICE_NOT_FOUND) | |
521 | (void) unit_acquire_invocation_id(UNIT(d)); | |
522 | ||
f6200941 LP |
523 | if (d->found & DEVICE_FOUND_UDEV) |
524 | /* When the device is known to udev we consider it | |
525 | * plugged. */ | |
526 | device_set_state(d, DEVICE_PLUGGED); | |
527 | else if (d->found != DEVICE_NOT_FOUND && (previous & DEVICE_FOUND_UDEV) == 0) | |
528 | /* If the device has not been seen by udev yet, but is | |
529 | * now referenced by the kernel, then we assume the | |
530 | * kernel knows it now, and udev might soon too. */ | |
531 | device_set_state(d, DEVICE_TENTATIVE); | |
05e33aa1 | 532 | else { |
f6200941 LP |
533 | /* If nobody sees the device, or if the device was |
534 | * previously seen by udev and now is only referenced | |
535 | * from the kernel, then we consider the device is | |
536 | * gone, the kernel just hasn't noticed it yet. */ | |
05e33aa1 | 537 | |
f6200941 | 538 | device_set_state(d, DEVICE_DEAD); |
05e33aa1 MS |
539 | device_unset_sysfs(d); |
540 | } | |
541 | ||
628c89cc LP |
542 | } |
543 | ||
544 | static int device_update_found_by_sysfs(Manager *m, const char *sysfs, bool add, DeviceFound found, bool now) { | |
cc0df6cc | 545 | Device *d, *l, *n; |
25ac040b LP |
546 | |
547 | assert(m); | |
628c89cc | 548 | assert(sysfs); |
25ac040b | 549 | |
628c89cc LP |
550 | if (found == DEVICE_NOT_FOUND) |
551 | return 0; | |
25ac040b | 552 | |
f1421cc6 | 553 | l = hashmap_get(m->devices_by_sysfs, sysfs); |
cc0df6cc | 554 | LIST_FOREACH_SAFE(same_sysfs, d, n, l) |
628c89cc LP |
555 | device_update_found_one(d, add, found, now); |
556 | ||
557 | return 0; | |
25ac040b LP |
558 | } |
559 | ||
628c89cc LP |
560 | static int device_update_found_by_name(Manager *m, const char *path, bool add, DeviceFound found, bool now) { |
561 | _cleanup_free_ char *e = NULL; | |
562 | Unit *u; | |
7410616c | 563 | int r; |
f94ea366 LP |
564 | |
565 | assert(m); | |
628c89cc | 566 | assert(path); |
f94ea366 | 567 | |
628c89cc LP |
568 | if (found == DEVICE_NOT_FOUND) |
569 | return 0; | |
f94ea366 | 570 | |
7410616c LP |
571 | r = unit_name_from_path(path, ".device", &e); |
572 | if (r < 0) | |
573 | return log_error_errno(r, "Failed to generate unit name from device path: %m"); | |
f94ea366 | 574 | |
628c89cc LP |
575 | u = manager_get_unit(m, e); |
576 | if (!u) | |
577 | return 0; | |
578 | ||
579 | device_update_found_one(DEVICE(u), add, found, now); | |
f94ea366 LP |
580 | return 0; |
581 | } | |
582 | ||
f1421cc6 LP |
583 | static bool device_is_ready(struct udev_device *dev) { |
584 | const char *ready; | |
585 | ||
586 | assert(dev); | |
587 | ||
588 | ready = udev_device_get_property_value(dev, "SYSTEMD_READY"); | |
589 | if (!ready) | |
590 | return true; | |
591 | ||
592 | return parse_boolean(ready) != 0; | |
593 | } | |
594 | ||
a7f241db LP |
595 | static Unit *device_following(Unit *u) { |
596 | Device *d = DEVICE(u); | |
597 | Device *other, *first = NULL; | |
598 | ||
599 | assert(d); | |
600 | ||
ac155bb8 | 601 | if (startswith(u->id, "sys-")) |
a7f241db LP |
602 | return NULL; |
603 | ||
604 | /* Make everybody follow the unit that's named after the sysfs path */ | |
605 | for (other = d->same_sysfs_next; other; other = other->same_sysfs_next) | |
1124fe6f | 606 | if (startswith(UNIT(other)->id, "sys-")) |
a7f241db LP |
607 | return UNIT(other); |
608 | ||
609 | for (other = d->same_sysfs_prev; other; other = other->same_sysfs_prev) { | |
1124fe6f | 610 | if (startswith(UNIT(other)->id, "sys-")) |
a7f241db LP |
611 | return UNIT(other); |
612 | ||
613 | first = other; | |
614 | } | |
615 | ||
616 | return UNIT(first); | |
617 | } | |
618 | ||
f1421cc6 LP |
619 | static int device_following_set(Unit *u, Set **_set) { |
620 | Device *d = DEVICE(u), *other; | |
621 | Set *set; | |
6210e7fc LP |
622 | int r; |
623 | ||
624 | assert(d); | |
f1421cc6 | 625 | assert(_set); |
6210e7fc | 626 | |
f1421cc6 LP |
627 | if (LIST_JUST_US(same_sysfs, d)) { |
628 | *_set = NULL; | |
6210e7fc LP |
629 | return 0; |
630 | } | |
631 | ||
d5099efc | 632 | set = set_new(NULL); |
f1421cc6 | 633 | if (!set) |
6210e7fc LP |
634 | return -ENOMEM; |
635 | ||
f1421cc6 LP |
636 | LIST_FOREACH_AFTER(same_sysfs, other, d) { |
637 | r = set_put(set, other); | |
638 | if (r < 0) | |
6210e7fc | 639 | goto fail; |
f1421cc6 | 640 | } |
6210e7fc | 641 | |
f1421cc6 LP |
642 | LIST_FOREACH_BEFORE(same_sysfs, other, d) { |
643 | r = set_put(set, other); | |
644 | if (r < 0) | |
6210e7fc | 645 | goto fail; |
f1421cc6 | 646 | } |
6210e7fc | 647 | |
f1421cc6 | 648 | *_set = set; |
6210e7fc LP |
649 | return 1; |
650 | ||
651 | fail: | |
f1421cc6 | 652 | set_free(set); |
6210e7fc LP |
653 | return r; |
654 | } | |
655 | ||
25ac040b LP |
656 | static void device_shutdown(Manager *m) { |
657 | assert(m); | |
658 | ||
718db961 LP |
659 | m->udev_event_source = sd_event_source_unref(m->udev_event_source); |
660 | ||
a16e1123 | 661 | if (m->udev_monitor) { |
f94ea366 | 662 | udev_monitor_unref(m->udev_monitor); |
a16e1123 LP |
663 | m->udev_monitor = NULL; |
664 | } | |
f94ea366 | 665 | |
525d3cc7 | 666 | m->devices_by_sysfs = hashmap_free(m->devices_by_sysfs); |
25ac040b LP |
667 | } |
668 | ||
ba64af90 | 669 | static void device_enumerate(Manager *m) { |
718db961 | 670 | _cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL; |
25ac040b | 671 | struct udev_list_entry *item = NULL, *first = NULL; |
718db961 | 672 | int r; |
25ac040b LP |
673 | |
674 | assert(m); | |
675 | ||
9670d583 | 676 | if (!m->udev_monitor) { |
718db961 LP |
677 | m->udev_monitor = udev_monitor_new_from_netlink(m->udev, "udev"); |
678 | if (!m->udev_monitor) { | |
ba64af90 | 679 | log_oom(); |
a16e1123 LP |
680 | goto fail; |
681 | } | |
f94ea366 | 682 | |
47ae6e67 LP |
683 | /* This will fail if we are unprivileged, but that |
684 | * should not matter much, as user instances won't run | |
685 | * during boot. */ | |
8fa158e7 | 686 | (void) udev_monitor_set_receive_buffer_size(m->udev_monitor, 128*1024*1024); |
99448c1f | 687 | |
718db961 | 688 | r = udev_monitor_filter_add_match_tag(m->udev_monitor, "systemd"); |
ba64af90 LP |
689 | if (r < 0) { |
690 | log_error_errno(r, "Failed to add udev tag match: %m"); | |
e1ce2c27 | 691 | goto fail; |
ba64af90 | 692 | } |
e1ce2c27 | 693 | |
718db961 | 694 | r = udev_monitor_enable_receiving(m->udev_monitor); |
ba64af90 LP |
695 | if (r < 0) { |
696 | log_error_errno(r, "Failed to enable udev event reception: %m"); | |
a16e1123 | 697 | goto fail; |
ba64af90 | 698 | } |
f94ea366 | 699 | |
151b9b96 | 700 | 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 |
701 | if (r < 0) { |
702 | log_error_errno(r, "Failed to watch udev file descriptor: %m"); | |
718db961 | 703 | goto fail; |
ba64af90 | 704 | } |
7dfbe2e3 TG |
705 | |
706 | (void) sd_event_source_set_description(m->udev_event_source, "device"); | |
a16e1123 | 707 | } |
f94ea366 | 708 | |
718db961 LP |
709 | e = udev_enumerate_new(m->udev); |
710 | if (!e) { | |
ba64af90 | 711 | log_oom(); |
4f2d528d LP |
712 | goto fail; |
713 | } | |
718db961 LP |
714 | |
715 | r = udev_enumerate_add_match_tag(e, "systemd"); | |
ba64af90 LP |
716 | if (r < 0) { |
717 | log_error_errno(r, "Failed to create udev tag enumeration: %m"); | |
e1ce2c27 | 718 | goto fail; |
ba64af90 | 719 | } |
25ac040b | 720 | |
e1202047 | 721 | r = udev_enumerate_add_match_is_initialized(e); |
ba64af90 LP |
722 | if (r < 0) { |
723 | log_error_errno(r, "Failed to install initialization match into enumeration: %m"); | |
e1202047 | 724 | goto fail; |
ba64af90 | 725 | } |
e1202047 | 726 | |
718db961 | 727 | r = udev_enumerate_scan_devices(e); |
ba64af90 LP |
728 | if (r < 0) { |
729 | log_error_errno(r, "Failed to enumerate devices: %m"); | |
4f2d528d | 730 | goto fail; |
ba64af90 | 731 | } |
25ac040b | 732 | |
4f2d528d | 733 | first = udev_enumerate_get_list_entry(e); |
628c89cc LP |
734 | udev_list_entry_foreach(item, first) { |
735 | _cleanup_udev_device_unref_ struct udev_device *dev = NULL; | |
736 | const char *sysfs; | |
737 | ||
738 | sysfs = udev_list_entry_get_name(item); | |
739 | ||
740 | dev = udev_device_new_from_syspath(m->udev, sysfs); | |
741 | if (!dev) { | |
742 | log_oom(); | |
743 | continue; | |
744 | } | |
745 | ||
746 | if (!device_is_ready(dev)) | |
747 | continue; | |
748 | ||
749 | (void) device_process_new(m, dev); | |
750 | ||
751 | device_update_found_by_sysfs(m, sysfs, true, DEVICE_FOUND_UDEV, false); | |
752 | } | |
25ac040b | 753 | |
ba64af90 | 754 | return; |
25ac040b LP |
755 | |
756 | fail: | |
25ac040b | 757 | device_shutdown(m); |
5cb5a6ff LP |
758 | } |
759 | ||
718db961 LP |
760 | static int device_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) { |
761 | _cleanup_udev_device_unref_ struct udev_device *dev = NULL; | |
718db961 | 762 | Manager *m = userdata; |
628c89cc | 763 | const char *action, *sysfs; |
718db961 | 764 | int r; |
f94ea366 LP |
765 | |
766 | assert(m); | |
99448c1f | 767 | |
718db961 | 768 | if (revents != EPOLLIN) { |
99448c1f KS |
769 | static RATELIMIT_DEFINE(limit, 10*USEC_PER_SEC, 5); |
770 | ||
771 | if (!ratelimit_test(&limit)) | |
56f64d95 | 772 | log_error_errno(errno, "Failed to get udev event: %m"); |
718db961 LP |
773 | if (!(revents & EPOLLIN)) |
774 | return 0; | |
99448c1f | 775 | } |
f94ea366 | 776 | |
718db961 LP |
777 | /* |
778 | * libudev might filter-out devices which pass the bloom | |
779 | * filter, so getting NULL here is not necessarily an error. | |
780 | */ | |
781 | dev = udev_monitor_receive_device(m->udev_monitor); | |
782 | if (!dev) | |
783 | return 0; | |
f94ea366 | 784 | |
628c89cc LP |
785 | sysfs = udev_device_get_syspath(dev); |
786 | if (!sysfs) { | |
787 | log_error("Failed to get udev sys path."); | |
788 | return 0; | |
789 | } | |
790 | ||
718db961 LP |
791 | action = udev_device_get_action(dev); |
792 | if (!action) { | |
f94ea366 | 793 | log_error("Failed to get udev action string."); |
718db961 | 794 | return 0; |
f94ea366 LP |
795 | } |
796 | ||
f332611a JR |
797 | if (streq(action, "change")) { |
798 | _cleanup_free_ char *e = NULL; | |
799 | Unit *u; | |
800 | ||
801 | r = unit_name_from_path(sysfs, ".device", &e); | |
802 | if (r < 0) | |
803 | log_error_errno(r, "Failed to generate unit name from device path: %m"); | |
804 | else { | |
805 | u = manager_get_unit(m, e); | |
806 | if (u && UNIT_VTABLE(u)->active_state(u) == UNIT_ACTIVE) { | |
807 | r = manager_propagate_reload(m, u, JOB_REPLACE, NULL); | |
808 | if (r < 0) | |
809 | log_error_errno(r, "Failed to propagate reload: %m"); | |
810 | } | |
811 | } | |
812 | } | |
813 | ||
814 | /* A change event can signal that a device is becoming ready, in particular if | |
815 | * the device is using the SYSTEMD_READY logic in udev | |
816 | * so we need to reach the else block of the follwing if, even for change events */ | |
6d445911 | 817 | if (streq(action, "remove")) { |
628c89cc | 818 | r = swap_process_device_remove(m, dev); |
9670d583 | 819 | if (r < 0) |
da927ba9 | 820 | log_error_errno(r, "Failed to process swap device remove event: %m"); |
9670d583 | 821 | |
628c89cc LP |
822 | /* If we get notified that a device was removed by |
823 | * udev, then it's completely gone, hence unset all | |
824 | * found bits */ | |
825 | device_update_found_by_sysfs(m, sysfs, false, DEVICE_FOUND_UDEV|DEVICE_FOUND_MOUNT|DEVICE_FOUND_SWAP, true); | |
f1421cc6 | 826 | |
628c89cc LP |
827 | } else if (device_is_ready(dev)) { |
828 | ||
829 | (void) device_process_new(m, dev); | |
830 | ||
831 | r = swap_process_device_new(m, dev); | |
9670d583 | 832 | if (r < 0) |
da927ba9 | 833 | log_error_errno(r, "Failed to process swap device new event: %m"); |
9670d583 | 834 | |
f1421cc6 LP |
835 | manager_dispatch_load_queue(m); |
836 | ||
628c89cc LP |
837 | /* The device is found now, set the udev found bit */ |
838 | device_update_found_by_sysfs(m, sysfs, true, DEVICE_FOUND_UDEV, true); | |
839 | ||
840 | } else { | |
841 | /* The device is nominally around, but not ready for | |
842 | * us. Hence unset the udev bit, but leave the rest | |
843 | * around. */ | |
844 | ||
845 | device_update_found_by_sysfs(m, sysfs, false, DEVICE_FOUND_UDEV, true); | |
f94ea366 LP |
846 | } |
847 | ||
718db961 | 848 | return 0; |
f94ea366 LP |
849 | } |
850 | ||
1c2e9646 | 851 | static bool device_supported(void) { |
0faacd47 | 852 | static int read_only = -1; |
0faacd47 LP |
853 | |
854 | /* If /sys is read-only we don't support device units, and any | |
855 | * attempts to start one should fail immediately. */ | |
856 | ||
857 | if (read_only < 0) | |
858 | read_only = path_is_read_only_fs("/sys"); | |
859 | ||
860 | return read_only <= 0; | |
861 | } | |
862 | ||
628c89cc LP |
863 | int device_found_node(Manager *m, const char *node, bool add, DeviceFound found, bool now) { |
864 | _cleanup_udev_device_unref_ struct udev_device *dev = NULL; | |
865 | struct stat st; | |
866 | ||
867 | assert(m); | |
868 | assert(node); | |
869 | ||
4c6d20de LP |
870 | if (!device_supported()) |
871 | return 0; | |
872 | ||
628c89cc LP |
873 | /* This is called whenever we find a device referenced in |
874 | * /proc/swaps or /proc/self/mounts. Such a device might be | |
875 | * mounted/enabled at a time where udev has not finished | |
876 | * probing it yet, and we thus haven't learned about it | |
877 | * yet. In this case we will set the device unit to | |
878 | * "tentative" state. */ | |
879 | ||
880 | if (add) { | |
881 | if (!path_startswith(node, "/dev")) | |
882 | return 0; | |
883 | ||
f6200941 LP |
884 | /* We make an extra check here, if the device node |
885 | * actually exists. If it's missing, then this is an | |
886 | * indication that device was unplugged but is still | |
887 | * referenced in /proc/swaps or | |
888 | * /proc/self/mountinfo. Note that this check doesn't | |
889 | * really cover all cases where a device might be gone | |
890 | * away, since drives that can have a medium inserted | |
891 | * will still have a device node even when the medium | |
892 | * is not there... */ | |
893 | ||
2005219f MP |
894 | if (stat(node, &st) >= 0) { |
895 | if (!S_ISBLK(st.st_mode) && !S_ISCHR(st.st_mode)) | |
628c89cc LP |
896 | return 0; |
897 | ||
2005219f MP |
898 | dev = udev_device_new_from_devnum(m->udev, S_ISBLK(st.st_mode) ? 'b' : 'c', st.st_rdev); |
899 | if (!dev && errno != ENOENT) | |
900 | return log_error_errno(errno, "Failed to get udev device from devnum %u:%u: %m", major(st.st_rdev), minor(st.st_rdev)); | |
628c89cc | 901 | |
2005219f MP |
902 | } else if (errno != ENOENT) |
903 | return log_error_errno(errno, "Failed to stat device node file %s: %m", node); | |
628c89cc LP |
904 | |
905 | /* If the device is known in the kernel and newly | |
906 | * appeared, then we'll create a device unit for it, | |
907 | * under the name referenced in /proc/swaps or | |
908 | * /proc/self/mountinfo. */ | |
909 | ||
910 | (void) device_setup_unit(m, dev, node, false); | |
911 | } | |
912 | ||
913 | /* Update the device unit's state, should it exist */ | |
914 | return device_update_found_by_name(m, node, add, found, now); | |
915 | } | |
916 | ||
ebc8968b FB |
917 | bool device_shall_be_bound_by(Unit *device, Unit *u) { |
918 | ||
919 | if (u->type != UNIT_MOUNT) | |
920 | return false; | |
921 | ||
922 | return DEVICE(device)->bind_mounts; | |
923 | } | |
924 | ||
87f0e418 | 925 | const UnitVTable device_vtable = { |
7d17cfbc | 926 | .object_size = sizeof(Device), |
f975e971 LP |
927 | .sections = |
928 | "Unit\0" | |
929 | "Device\0" | |
930 | "Install\0", | |
5cb5a6ff | 931 | |
c5a97ed1 LP |
932 | .gc_jobs = true, |
933 | ||
faf919f1 | 934 | .init = device_init, |
034c6ed7 | 935 | .done = device_done, |
718db961 LP |
936 | .load = unit_load_fragment_and_dropin_optional, |
937 | ||
f50e0a01 LP |
938 | .coldplug = device_coldplug, |
939 | ||
f6200941 LP |
940 | .serialize = device_serialize, |
941 | .deserialize_item = device_deserialize_item, | |
942 | ||
5cb5a6ff LP |
943 | .dump = device_dump, |
944 | ||
f50e0a01 | 945 | .active_state = device_active_state, |
10a94420 | 946 | .sub_state_to_string = device_sub_state_to_string, |
25ac040b | 947 | |
718db961 | 948 | .bus_vtable = bus_device_vtable, |
4139c1b2 | 949 | |
a7f241db | 950 | .following = device_following, |
6210e7fc | 951 | .following_set = device_following_set, |
a7f241db | 952 | |
f50e0a01 | 953 | .enumerate = device_enumerate, |
c6918296 | 954 | .shutdown = device_shutdown, |
0faacd47 | 955 | .supported = device_supported, |
c6918296 MS |
956 | |
957 | .status_message_formats = { | |
958 | .starting_stopping = { | |
959 | [0] = "Expecting device %s...", | |
960 | }, | |
961 | .finished_start_job = { | |
962 | [JOB_DONE] = "Found device %s.", | |
963 | [JOB_TIMEOUT] = "Timed out waiting for device %s.", | |
964 | }, | |
965 | }, | |
5cb5a6ff | 966 | }; |