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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) | |
280 | return log_unit_error_errno(u, r, "Failed to add parse %s: %m", property); | |
965e5c5d | 281 | |
ceed8f0c | 282 | r = unit_name_mangle(word, UNIT_NAME_NOGLOB, &k); |
7410616c | 283 | if (r < 0) |
ceed8f0c | 284 | return log_unit_error_errno(u, r, "Failed to mangle unit name \"%s\": %m", word); |
965e5c5d | 285 | |
eef85c4a | 286 | r = unit_add_dependency_by_name(u, UNIT_WANTS, k, NULL, true, UNIT_DEPENDENCY_UDEV); |
965e5c5d | 287 | if (r < 0) |
de040543 | 288 | return log_unit_error_errno(u, r, "Failed to add Wants= dependency: %m"); |
965e5c5d | 289 | } |
965e5c5d LP |
290 | } |
291 | ||
40b1a32c | 292 | static bool device_is_bound_by_mounts(Device *d, struct udev_device *dev) { |
ebc8968b | 293 | const char *bound_by; |
40b1a32c | 294 | int r; |
ebc8968b FB |
295 | |
296 | assert(d); | |
297 | assert(dev); | |
298 | ||
299 | bound_by = udev_device_get_property_value(dev, "SYSTEMD_MOUNT_DEVICE_BOUND"); | |
40b1a32c LP |
300 | if (bound_by) { |
301 | r = parse_boolean(bound_by); | |
302 | if (r < 0) | |
303 | log_warning_errno(r, "Failed to parse SYSTEMD_MOUNT_DEVICE_BOUND='%s' udev property of %s, ignoring: %m", bound_by, strna(d->sysfs)); | |
ebc8968b | 304 | |
40b1a32c LP |
305 | d->bind_mounts = r > 0; |
306 | } else | |
307 | d->bind_mounts = false; | |
308 | ||
309 | return d->bind_mounts; | |
ebc8968b FB |
310 | } |
311 | ||
312 | static int device_upgrade_mount_deps(Unit *u) { | |
313 | Unit *other; | |
314 | Iterator i; | |
eef85c4a | 315 | void *v; |
ebc8968b FB |
316 | int r; |
317 | ||
eef85c4a LP |
318 | /* Let's upgrade Requires= to BindsTo= on us. (Used when SYSTEMD_MOUNT_DEVICE_BOUND is set) */ |
319 | ||
320 | HASHMAP_FOREACH_KEY(v, other, u->dependencies[UNIT_REQUIRED_BY], i) { | |
ebc8968b FB |
321 | if (other->type != UNIT_MOUNT) |
322 | continue; | |
323 | ||
eef85c4a | 324 | r = unit_add_dependency(other, UNIT_BINDS_TO, u, true, UNIT_DEPENDENCY_UDEV); |
ebc8968b FB |
325 | if (r < 0) |
326 | return r; | |
327 | } | |
328 | return 0; | |
329 | } | |
330 | ||
628c89cc LP |
331 | static int device_setup_unit(Manager *m, struct udev_device *dev, const char *path, bool main) { |
332 | _cleanup_free_ char *e = NULL; | |
2005219f | 333 | const char *sysfs = NULL; |
25ac040b | 334 | Unit *u = NULL; |
25ac040b | 335 | bool delete; |
965e5c5d | 336 | int r; |
25ac040b LP |
337 | |
338 | assert(m); | |
965e5c5d | 339 | assert(path); |
25ac040b | 340 | |
2005219f MP |
341 | if (dev) { |
342 | sysfs = udev_device_get_syspath(dev); | |
343 | if (!sysfs) | |
344 | return 0; | |
345 | } | |
7f275a9f | 346 | |
7410616c LP |
347 | r = unit_name_from_path(path, ".device", &e); |
348 | if (r < 0) | |
7f629b74 | 349 | return log_error_errno(r, "Failed to generate unit name from device path: %m"); |
628c89cc LP |
350 | |
351 | u = manager_get_unit(m, e); | |
25ac040b | 352 | |
ac9d396b FB |
353 | /* The device unit can still be present even if the device was |
354 | * unplugged: a mount unit can reference it hence preventing | |
355 | * the GC to have garbaged it. That's desired since the device | |
356 | * unit may have a dependency on the mount unit which was | |
357 | * added during the loading of the later. */ | |
51f21740 | 358 | if (dev && u && DEVICE(u)->state == DEVICE_PLUGGED) { |
ac9d396b FB |
359 | /* This unit is in plugged state: we're sure it's |
360 | * attached to a device. */ | |
361 | if (!path_equal(DEVICE(u)->sysfs, sysfs)) { | |
071e0b8b | 362 | log_unit_debug(u, "Dev %s appeared twice with different sysfs paths %s and %s", |
ac9d396b FB |
363 | e, DEVICE(u)->sysfs, sysfs); |
364 | return -EEXIST; | |
365 | } | |
628c89cc | 366 | } |
25ac040b | 367 | |
aab14b13 LP |
368 | if (!u) { |
369 | delete = true; | |
370 | ||
a581e45a | 371 | r = unit_new_for_name(m, sizeof(Device), e, &u); |
7d17cfbc | 372 | if (r < 0) |
25ac040b LP |
373 | goto fail; |
374 | ||
ee6cb288 LP |
375 | unit_add_to_load_queue(u); |
376 | } else | |
377 | delete = false; | |
378 | ||
379 | /* If this was created via some dependency and has not | |
380 | * actually been seen yet ->sysfs will not be | |
381 | * initialized. Hence initialize it if necessary. */ | |
2005219f MP |
382 | if (sysfs) { |
383 | r = device_set_sysfs(DEVICE(u), sysfs); | |
384 | if (r < 0) | |
385 | goto fail; | |
ee6cb288 | 386 | |
2005219f | 387 | (void) device_update_description(u, dev, path); |
aab14b13 | 388 | |
2005219f MP |
389 | /* The additional systemd udev properties we only interpret |
390 | * for the main object */ | |
391 | if (main) | |
392 | (void) device_add_udev_wants(u, dev); | |
393 | } | |
25ac040b | 394 | |
eef85c4a LP |
395 | /* So the user wants the mount units to be bound to the device but a mount unit might has been seen by systemd |
396 | * before the device appears on its radar. In this case the device unit is partially initialized and includes | |
397 | * the deps on the mount unit but at that time the "bind mounts" flag wasn't not present. Fix this up now. */ | |
40b1a32c | 398 | if (dev && device_is_bound_by_mounts(DEVICE(u), dev)) |
ebc8968b | 399 | device_upgrade_mount_deps(u); |
f94ea366 | 400 | |
f1421cc6 LP |
401 | /* Note that this won't dispatch the load queue, the caller |
402 | * has to do that if needed and appropriate */ | |
403 | ||
c1e1601e | 404 | unit_add_to_dbus_queue(u); |
25ac040b LP |
405 | return 0; |
406 | ||
407 | fail: | |
f2341e0a | 408 | log_unit_warning_errno(u, r, "Failed to set up device unit: %m"); |
ee5f3479 | 409 | |
c9d5c9c0 | 410 | if (delete) |
25ac040b | 411 | unit_free(u); |
ee5f3479 | 412 | |
25ac040b LP |
413 | return r; |
414 | } | |
415 | ||
628c89cc | 416 | static int device_process_new(Manager *m, struct udev_device *dev) { |
f1421cc6 | 417 | const char *sysfs, *dn, *alias; |
8fe914ec | 418 | struct udev_list_entry *item = NULL, *first = NULL; |
003ac9d0 | 419 | int r; |
8fe914ec LP |
420 | |
421 | assert(m); | |
422 | ||
718db961 LP |
423 | sysfs = udev_device_get_syspath(dev); |
424 | if (!sysfs) | |
f1421cc6 | 425 | return 0; |
8fe914ec LP |
426 | |
427 | /* Add the main unit named after the sysfs path */ | |
628c89cc | 428 | r = device_setup_unit(m, dev, sysfs, true); |
003ac9d0 HH |
429 | if (r < 0) |
430 | return r; | |
8fe914ec LP |
431 | |
432 | /* Add an additional unit for the device node */ | |
f1421cc6 LP |
433 | dn = udev_device_get_devnode(dev); |
434 | if (dn) | |
628c89cc | 435 | (void) device_setup_unit(m, dev, dn, false); |
8fe914ec LP |
436 | |
437 | /* Add additional units for all symlinks */ | |
438 | first = udev_device_get_devlinks_list_entry(dev); | |
439 | udev_list_entry_foreach(item, first) { | |
440 | const char *p; | |
5845b46b | 441 | struct stat st; |
8fe914ec LP |
442 | |
443 | /* Don't bother with the /dev/block links */ | |
444 | p = udev_list_entry_get_name(item); | |
445 | ||
446 | if (path_startswith(p, "/dev/block/") || | |
447 | path_startswith(p, "/dev/char/")) | |
448 | continue; | |
449 | ||
5845b46b LP |
450 | /* Verify that the symlink in the FS actually belongs |
451 | * to this device. This is useful to deal with | |
452 | * conflicting devices, e.g. when two disks want the | |
453 | * same /dev/disk/by-label/xxx link because they have | |
454 | * the same label. We want to make sure that the same | |
455 | * device that won the symlink wins in systemd, so we | |
ee33e53a | 456 | * check the device node major/minor */ |
5845b46b LP |
457 | if (stat(p, &st) >= 0) |
458 | if ((!S_ISBLK(st.st_mode) && !S_ISCHR(st.st_mode)) || | |
459 | st.st_rdev != udev_device_get_devnum(dev)) | |
460 | continue; | |
461 | ||
628c89cc | 462 | (void) device_setup_unit(m, dev, p, false); |
8fe914ec LP |
463 | } |
464 | ||
f1421cc6 LP |
465 | /* Add additional units for all explicitly configured |
466 | * aliases */ | |
467 | alias = udev_device_get_property_value(dev, "SYSTEMD_ALIAS"); | |
ceed8f0c | 468 | for (;;) { |
8fb242ab | 469 | _cleanup_free_ char *word = NULL; |
8fe914ec | 470 | |
ceed8f0c ZJS |
471 | r = extract_first_word(&alias, &word, NULL, EXTRACT_QUOTES); |
472 | if (r == 0) | |
473 | return 0; | |
474 | if (r == -ENOMEM) | |
475 | return log_oom(); | |
476 | if (r < 0) | |
477 | return log_warning_errno(r, "Failed to add parse SYSTEMD_ALIAS for %s: %m", sysfs); | |
f1421cc6 | 478 | |
ceed8f0c ZJS |
479 | if (path_is_absolute(word)) |
480 | (void) device_setup_unit(m, dev, word, false); | |
481 | else | |
482 | log_warning("SYSTEMD_ALIAS for %s is not an absolute path, ignoring: %s", sysfs, word); | |
8fe914ec | 483 | } |
8fe914ec LP |
484 | } |
485 | ||
628c89cc | 486 | static void device_update_found_one(Device *d, bool add, DeviceFound found, bool now) { |
f6200941 | 487 | DeviceFound n, previous; |
628c89cc LP |
488 | |
489 | assert(d); | |
490 | ||
491 | n = add ? (d->found | found) : (d->found & ~found); | |
492 | if (n == d->found) | |
493 | return; | |
494 | ||
f6200941 | 495 | previous = d->found; |
628c89cc LP |
496 | d->found = n; |
497 | ||
f6200941 LP |
498 | if (!now) |
499 | return; | |
500 | ||
4b58153d LP |
501 | /* Didn't exist before, but does now? if so, generate a new invocation ID for it */ |
502 | if (previous == DEVICE_NOT_FOUND && d->found != DEVICE_NOT_FOUND) | |
503 | (void) unit_acquire_invocation_id(UNIT(d)); | |
504 | ||
f6200941 LP |
505 | if (d->found & DEVICE_FOUND_UDEV) |
506 | /* When the device is known to udev we consider it | |
507 | * plugged. */ | |
508 | device_set_state(d, DEVICE_PLUGGED); | |
509 | else if (d->found != DEVICE_NOT_FOUND && (previous & DEVICE_FOUND_UDEV) == 0) | |
510 | /* If the device has not been seen by udev yet, but is | |
511 | * now referenced by the kernel, then we assume the | |
512 | * kernel knows it now, and udev might soon too. */ | |
513 | device_set_state(d, DEVICE_TENTATIVE); | |
05e33aa1 | 514 | else { |
f6200941 LP |
515 | /* If nobody sees the device, or if the device was |
516 | * previously seen by udev and now is only referenced | |
517 | * from the kernel, then we consider the device is | |
518 | * gone, the kernel just hasn't noticed it yet. */ | |
05e33aa1 | 519 | |
f6200941 | 520 | device_set_state(d, DEVICE_DEAD); |
05e33aa1 MS |
521 | device_unset_sysfs(d); |
522 | } | |
523 | ||
628c89cc LP |
524 | } |
525 | ||
526 | static int device_update_found_by_sysfs(Manager *m, const char *sysfs, bool add, DeviceFound found, bool now) { | |
cc0df6cc | 527 | Device *d, *l, *n; |
25ac040b LP |
528 | |
529 | assert(m); | |
628c89cc | 530 | assert(sysfs); |
25ac040b | 531 | |
628c89cc LP |
532 | if (found == DEVICE_NOT_FOUND) |
533 | return 0; | |
25ac040b | 534 | |
f1421cc6 | 535 | l = hashmap_get(m->devices_by_sysfs, sysfs); |
cc0df6cc | 536 | LIST_FOREACH_SAFE(same_sysfs, d, n, l) |
628c89cc LP |
537 | device_update_found_one(d, add, found, now); |
538 | ||
539 | return 0; | |
25ac040b LP |
540 | } |
541 | ||
628c89cc LP |
542 | static int device_update_found_by_name(Manager *m, const char *path, bool add, DeviceFound found, bool now) { |
543 | _cleanup_free_ char *e = NULL; | |
544 | Unit *u; | |
7410616c | 545 | int r; |
f94ea366 LP |
546 | |
547 | assert(m); | |
628c89cc | 548 | assert(path); |
f94ea366 | 549 | |
628c89cc LP |
550 | if (found == DEVICE_NOT_FOUND) |
551 | return 0; | |
f94ea366 | 552 | |
7410616c LP |
553 | r = unit_name_from_path(path, ".device", &e); |
554 | if (r < 0) | |
555 | return log_error_errno(r, "Failed to generate unit name from device path: %m"); | |
f94ea366 | 556 | |
628c89cc LP |
557 | u = manager_get_unit(m, e); |
558 | if (!u) | |
559 | return 0; | |
560 | ||
561 | device_update_found_one(DEVICE(u), add, found, now); | |
f94ea366 LP |
562 | return 0; |
563 | } | |
564 | ||
f1421cc6 LP |
565 | static bool device_is_ready(struct udev_device *dev) { |
566 | const char *ready; | |
567 | ||
568 | assert(dev); | |
569 | ||
570 | ready = udev_device_get_property_value(dev, "SYSTEMD_READY"); | |
571 | if (!ready) | |
572 | return true; | |
573 | ||
574 | return parse_boolean(ready) != 0; | |
575 | } | |
576 | ||
a7f241db LP |
577 | static Unit *device_following(Unit *u) { |
578 | Device *d = DEVICE(u); | |
579 | Device *other, *first = NULL; | |
580 | ||
581 | assert(d); | |
582 | ||
ac155bb8 | 583 | if (startswith(u->id, "sys-")) |
a7f241db LP |
584 | return NULL; |
585 | ||
586 | /* Make everybody follow the unit that's named after the sysfs path */ | |
587 | for (other = d->same_sysfs_next; other; other = other->same_sysfs_next) | |
1124fe6f | 588 | if (startswith(UNIT(other)->id, "sys-")) |
a7f241db LP |
589 | return UNIT(other); |
590 | ||
591 | for (other = d->same_sysfs_prev; other; other = other->same_sysfs_prev) { | |
1124fe6f | 592 | if (startswith(UNIT(other)->id, "sys-")) |
a7f241db LP |
593 | return UNIT(other); |
594 | ||
595 | first = other; | |
596 | } | |
597 | ||
598 | return UNIT(first); | |
599 | } | |
600 | ||
f1421cc6 LP |
601 | static int device_following_set(Unit *u, Set **_set) { |
602 | Device *d = DEVICE(u), *other; | |
603 | Set *set; | |
6210e7fc LP |
604 | int r; |
605 | ||
606 | assert(d); | |
f1421cc6 | 607 | assert(_set); |
6210e7fc | 608 | |
f1421cc6 LP |
609 | if (LIST_JUST_US(same_sysfs, d)) { |
610 | *_set = NULL; | |
6210e7fc LP |
611 | return 0; |
612 | } | |
613 | ||
d5099efc | 614 | set = set_new(NULL); |
f1421cc6 | 615 | if (!set) |
6210e7fc LP |
616 | return -ENOMEM; |
617 | ||
f1421cc6 LP |
618 | LIST_FOREACH_AFTER(same_sysfs, other, d) { |
619 | r = set_put(set, other); | |
620 | if (r < 0) | |
6210e7fc | 621 | goto fail; |
f1421cc6 | 622 | } |
6210e7fc | 623 | |
f1421cc6 LP |
624 | LIST_FOREACH_BEFORE(same_sysfs, other, d) { |
625 | r = set_put(set, other); | |
626 | if (r < 0) | |
6210e7fc | 627 | goto fail; |
f1421cc6 | 628 | } |
6210e7fc | 629 | |
f1421cc6 | 630 | *_set = set; |
6210e7fc LP |
631 | return 1; |
632 | ||
633 | fail: | |
f1421cc6 | 634 | set_free(set); |
6210e7fc LP |
635 | return r; |
636 | } | |
637 | ||
25ac040b LP |
638 | static void device_shutdown(Manager *m) { |
639 | assert(m); | |
640 | ||
718db961 LP |
641 | m->udev_event_source = sd_event_source_unref(m->udev_event_source); |
642 | ||
a16e1123 | 643 | if (m->udev_monitor) { |
f94ea366 | 644 | udev_monitor_unref(m->udev_monitor); |
a16e1123 LP |
645 | m->udev_monitor = NULL; |
646 | } | |
f94ea366 | 647 | |
525d3cc7 | 648 | m->devices_by_sysfs = hashmap_free(m->devices_by_sysfs); |
25ac040b LP |
649 | } |
650 | ||
ba64af90 | 651 | static void device_enumerate(Manager *m) { |
718db961 | 652 | _cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL; |
25ac040b | 653 | struct udev_list_entry *item = NULL, *first = NULL; |
718db961 | 654 | int r; |
25ac040b LP |
655 | |
656 | assert(m); | |
657 | ||
9670d583 | 658 | if (!m->udev_monitor) { |
718db961 LP |
659 | m->udev_monitor = udev_monitor_new_from_netlink(m->udev, "udev"); |
660 | if (!m->udev_monitor) { | |
ba64af90 | 661 | log_oom(); |
a16e1123 LP |
662 | goto fail; |
663 | } | |
f94ea366 | 664 | |
47ae6e67 LP |
665 | /* This will fail if we are unprivileged, but that |
666 | * should not matter much, as user instances won't run | |
667 | * during boot. */ | |
8fa158e7 | 668 | (void) udev_monitor_set_receive_buffer_size(m->udev_monitor, 128*1024*1024); |
99448c1f | 669 | |
718db961 | 670 | r = udev_monitor_filter_add_match_tag(m->udev_monitor, "systemd"); |
ba64af90 LP |
671 | if (r < 0) { |
672 | log_error_errno(r, "Failed to add udev tag match: %m"); | |
e1ce2c27 | 673 | goto fail; |
ba64af90 | 674 | } |
e1ce2c27 | 675 | |
718db961 | 676 | r = udev_monitor_enable_receiving(m->udev_monitor); |
ba64af90 LP |
677 | if (r < 0) { |
678 | log_error_errno(r, "Failed to enable udev event reception: %m"); | |
a16e1123 | 679 | goto fail; |
ba64af90 | 680 | } |
f94ea366 | 681 | |
151b9b96 | 682 | 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 |
683 | if (r < 0) { |
684 | log_error_errno(r, "Failed to watch udev file descriptor: %m"); | |
718db961 | 685 | goto fail; |
ba64af90 | 686 | } |
7dfbe2e3 TG |
687 | |
688 | (void) sd_event_source_set_description(m->udev_event_source, "device"); | |
a16e1123 | 689 | } |
f94ea366 | 690 | |
718db961 LP |
691 | e = udev_enumerate_new(m->udev); |
692 | if (!e) { | |
ba64af90 | 693 | log_oom(); |
4f2d528d LP |
694 | goto fail; |
695 | } | |
718db961 LP |
696 | |
697 | r = udev_enumerate_add_match_tag(e, "systemd"); | |
ba64af90 LP |
698 | if (r < 0) { |
699 | log_error_errno(r, "Failed to create udev tag enumeration: %m"); | |
e1ce2c27 | 700 | goto fail; |
ba64af90 | 701 | } |
25ac040b | 702 | |
e1202047 | 703 | r = udev_enumerate_add_match_is_initialized(e); |
ba64af90 LP |
704 | if (r < 0) { |
705 | log_error_errno(r, "Failed to install initialization match into enumeration: %m"); | |
e1202047 | 706 | goto fail; |
ba64af90 | 707 | } |
e1202047 | 708 | |
718db961 | 709 | r = udev_enumerate_scan_devices(e); |
ba64af90 LP |
710 | if (r < 0) { |
711 | log_error_errno(r, "Failed to enumerate devices: %m"); | |
4f2d528d | 712 | goto fail; |
ba64af90 | 713 | } |
25ac040b | 714 | |
4f2d528d | 715 | first = udev_enumerate_get_list_entry(e); |
628c89cc LP |
716 | udev_list_entry_foreach(item, first) { |
717 | _cleanup_udev_device_unref_ struct udev_device *dev = NULL; | |
718 | const char *sysfs; | |
719 | ||
720 | sysfs = udev_list_entry_get_name(item); | |
721 | ||
722 | dev = udev_device_new_from_syspath(m->udev, sysfs); | |
723 | if (!dev) { | |
724 | log_oom(); | |
725 | continue; | |
726 | } | |
727 | ||
728 | if (!device_is_ready(dev)) | |
729 | continue; | |
730 | ||
731 | (void) device_process_new(m, dev); | |
732 | ||
733 | device_update_found_by_sysfs(m, sysfs, true, DEVICE_FOUND_UDEV, false); | |
734 | } | |
25ac040b | 735 | |
ba64af90 | 736 | return; |
25ac040b LP |
737 | |
738 | fail: | |
25ac040b | 739 | device_shutdown(m); |
5cb5a6ff LP |
740 | } |
741 | ||
718db961 LP |
742 | static int device_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) { |
743 | _cleanup_udev_device_unref_ struct udev_device *dev = NULL; | |
718db961 | 744 | Manager *m = userdata; |
628c89cc | 745 | const char *action, *sysfs; |
718db961 | 746 | int r; |
f94ea366 LP |
747 | |
748 | assert(m); | |
99448c1f | 749 | |
718db961 | 750 | if (revents != EPOLLIN) { |
99448c1f KS |
751 | static RATELIMIT_DEFINE(limit, 10*USEC_PER_SEC, 5); |
752 | ||
753 | if (!ratelimit_test(&limit)) | |
56f64d95 | 754 | log_error_errno(errno, "Failed to get udev event: %m"); |
718db961 LP |
755 | if (!(revents & EPOLLIN)) |
756 | return 0; | |
99448c1f | 757 | } |
f94ea366 | 758 | |
718db961 LP |
759 | /* |
760 | * libudev might filter-out devices which pass the bloom | |
761 | * filter, so getting NULL here is not necessarily an error. | |
762 | */ | |
763 | dev = udev_monitor_receive_device(m->udev_monitor); | |
764 | if (!dev) | |
765 | return 0; | |
f94ea366 | 766 | |
628c89cc LP |
767 | sysfs = udev_device_get_syspath(dev); |
768 | if (!sysfs) { | |
769 | log_error("Failed to get udev sys path."); | |
770 | return 0; | |
771 | } | |
772 | ||
718db961 LP |
773 | action = udev_device_get_action(dev); |
774 | if (!action) { | |
f94ea366 | 775 | log_error("Failed to get udev action string."); |
718db961 | 776 | return 0; |
f94ea366 LP |
777 | } |
778 | ||
f332611a JR |
779 | if (streq(action, "change")) { |
780 | _cleanup_free_ char *e = NULL; | |
781 | Unit *u; | |
782 | ||
783 | r = unit_name_from_path(sysfs, ".device", &e); | |
784 | if (r < 0) | |
785 | log_error_errno(r, "Failed to generate unit name from device path: %m"); | |
786 | else { | |
787 | u = manager_get_unit(m, e); | |
788 | if (u && UNIT_VTABLE(u)->active_state(u) == UNIT_ACTIVE) { | |
789 | r = manager_propagate_reload(m, u, JOB_REPLACE, NULL); | |
790 | if (r < 0) | |
791 | log_error_errno(r, "Failed to propagate reload: %m"); | |
792 | } | |
793 | } | |
794 | } | |
795 | ||
796 | /* A change event can signal that a device is becoming ready, in particular if | |
797 | * the device is using the SYSTEMD_READY logic in udev | |
798 | * so we need to reach the else block of the follwing if, even for change events */ | |
6d445911 | 799 | if (streq(action, "remove")) { |
628c89cc | 800 | r = swap_process_device_remove(m, dev); |
9670d583 | 801 | if (r < 0) |
da927ba9 | 802 | log_error_errno(r, "Failed to process swap device remove event: %m"); |
9670d583 | 803 | |
628c89cc LP |
804 | /* If we get notified that a device was removed by |
805 | * udev, then it's completely gone, hence unset all | |
806 | * found bits */ | |
807 | device_update_found_by_sysfs(m, sysfs, false, DEVICE_FOUND_UDEV|DEVICE_FOUND_MOUNT|DEVICE_FOUND_SWAP, true); | |
f1421cc6 | 808 | |
628c89cc LP |
809 | } else if (device_is_ready(dev)) { |
810 | ||
811 | (void) device_process_new(m, dev); | |
812 | ||
813 | r = swap_process_device_new(m, dev); | |
9670d583 | 814 | if (r < 0) |
da927ba9 | 815 | log_error_errno(r, "Failed to process swap device new event: %m"); |
9670d583 | 816 | |
f1421cc6 LP |
817 | manager_dispatch_load_queue(m); |
818 | ||
628c89cc LP |
819 | /* The device is found now, set the udev found bit */ |
820 | device_update_found_by_sysfs(m, sysfs, true, DEVICE_FOUND_UDEV, true); | |
821 | ||
822 | } else { | |
823 | /* The device is nominally around, but not ready for | |
824 | * us. Hence unset the udev bit, but leave the rest | |
825 | * around. */ | |
826 | ||
827 | device_update_found_by_sysfs(m, sysfs, false, DEVICE_FOUND_UDEV, true); | |
f94ea366 LP |
828 | } |
829 | ||
718db961 | 830 | return 0; |
f94ea366 LP |
831 | } |
832 | ||
1c2e9646 | 833 | static bool device_supported(void) { |
0faacd47 | 834 | static int read_only = -1; |
0faacd47 LP |
835 | |
836 | /* If /sys is read-only we don't support device units, and any | |
837 | * attempts to start one should fail immediately. */ | |
838 | ||
839 | if (read_only < 0) | |
840 | read_only = path_is_read_only_fs("/sys"); | |
841 | ||
842 | return read_only <= 0; | |
843 | } | |
844 | ||
628c89cc LP |
845 | int device_found_node(Manager *m, const char *node, bool add, DeviceFound found, bool now) { |
846 | _cleanup_udev_device_unref_ struct udev_device *dev = NULL; | |
847 | struct stat st; | |
848 | ||
849 | assert(m); | |
850 | assert(node); | |
851 | ||
4c6d20de LP |
852 | if (!device_supported()) |
853 | return 0; | |
854 | ||
628c89cc LP |
855 | /* This is called whenever we find a device referenced in |
856 | * /proc/swaps or /proc/self/mounts. Such a device might be | |
857 | * mounted/enabled at a time where udev has not finished | |
858 | * probing it yet, and we thus haven't learned about it | |
859 | * yet. In this case we will set the device unit to | |
860 | * "tentative" state. */ | |
861 | ||
862 | if (add) { | |
863 | if (!path_startswith(node, "/dev")) | |
864 | return 0; | |
865 | ||
f6200941 LP |
866 | /* We make an extra check here, if the device node |
867 | * actually exists. If it's missing, then this is an | |
868 | * indication that device was unplugged but is still | |
869 | * referenced in /proc/swaps or | |
870 | * /proc/self/mountinfo. Note that this check doesn't | |
871 | * really cover all cases where a device might be gone | |
872 | * away, since drives that can have a medium inserted | |
873 | * will still have a device node even when the medium | |
874 | * is not there... */ | |
875 | ||
2005219f MP |
876 | if (stat(node, &st) >= 0) { |
877 | if (!S_ISBLK(st.st_mode) && !S_ISCHR(st.st_mode)) | |
628c89cc LP |
878 | return 0; |
879 | ||
2005219f MP |
880 | dev = udev_device_new_from_devnum(m->udev, S_ISBLK(st.st_mode) ? 'b' : 'c', st.st_rdev); |
881 | if (!dev && errno != ENOENT) | |
882 | return log_error_errno(errno, "Failed to get udev device from devnum %u:%u: %m", major(st.st_rdev), minor(st.st_rdev)); | |
628c89cc | 883 | |
2005219f MP |
884 | } else if (errno != ENOENT) |
885 | return log_error_errno(errno, "Failed to stat device node file %s: %m", node); | |
628c89cc LP |
886 | |
887 | /* If the device is known in the kernel and newly | |
888 | * appeared, then we'll create a device unit for it, | |
889 | * under the name referenced in /proc/swaps or | |
890 | * /proc/self/mountinfo. */ | |
891 | ||
892 | (void) device_setup_unit(m, dev, node, false); | |
893 | } | |
894 | ||
895 | /* Update the device unit's state, should it exist */ | |
896 | return device_update_found_by_name(m, node, add, found, now); | |
897 | } | |
898 | ||
ebc8968b FB |
899 | bool device_shall_be_bound_by(Unit *device, Unit *u) { |
900 | ||
901 | if (u->type != UNIT_MOUNT) | |
902 | return false; | |
903 | ||
904 | return DEVICE(device)->bind_mounts; | |
905 | } | |
906 | ||
87f0e418 | 907 | const UnitVTable device_vtable = { |
7d17cfbc | 908 | .object_size = sizeof(Device), |
f975e971 LP |
909 | .sections = |
910 | "Unit\0" | |
911 | "Device\0" | |
912 | "Install\0", | |
5cb5a6ff | 913 | |
c5a97ed1 LP |
914 | .gc_jobs = true, |
915 | ||
faf919f1 | 916 | .init = device_init, |
034c6ed7 | 917 | .done = device_done, |
718db961 LP |
918 | .load = unit_load_fragment_and_dropin_optional, |
919 | ||
f50e0a01 LP |
920 | .coldplug = device_coldplug, |
921 | ||
f6200941 LP |
922 | .serialize = device_serialize, |
923 | .deserialize_item = device_deserialize_item, | |
924 | ||
5cb5a6ff LP |
925 | .dump = device_dump, |
926 | ||
f50e0a01 | 927 | .active_state = device_active_state, |
10a94420 | 928 | .sub_state_to_string = device_sub_state_to_string, |
25ac040b | 929 | |
718db961 | 930 | .bus_vtable = bus_device_vtable, |
4139c1b2 | 931 | |
a7f241db | 932 | .following = device_following, |
6210e7fc | 933 | .following_set = device_following_set, |
a7f241db | 934 | |
f50e0a01 | 935 | .enumerate = device_enumerate, |
c6918296 | 936 | .shutdown = device_shutdown, |
0faacd47 | 937 | .supported = device_supported, |
c6918296 MS |
938 | |
939 | .status_message_formats = { | |
940 | .starting_stopping = { | |
941 | [0] = "Expecting device %s...", | |
942 | }, | |
943 | .finished_start_job = { | |
944 | [JOB_DONE] = "Found device %s.", | |
945 | [JOB_TIMEOUT] = "Timed out waiting for device %s.", | |
946 | }, | |
947 | }, | |
5cb5a6ff | 948 | }; |