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db9ecf05 | 1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
a7334b09 | 2 | |
25ac040b | 3 | #include <errno.h> |
f94ea366 | 4 | #include <sys/epoll.h> |
25ac040b | 5 | |
ad172d19 LP |
6 | #include "sd-messages.h" |
7 | ||
b5efdb8a | 8 | #include "alloc-util.h" |
b4e2fcb6 | 9 | #include "bus-common-errors.h" |
4139c1b2 | 10 | #include "dbus-device.h" |
6fcbec6f | 11 | #include "dbus-unit.h" |
4212fa83 | 12 | #include "device-private.h" |
4366e598 | 13 | #include "device-util.h" |
6bedfcbb | 14 | #include "device.h" |
07630cea | 15 | #include "log.h" |
6bedfcbb | 16 | #include "parse-util.h" |
9eb977db | 17 | #include "path-util.h" |
ad172d19 | 18 | #include "ratelimit.h" |
d68c645b | 19 | #include "serialize.h" |
8fcde012 | 20 | #include "stat-util.h" |
07630cea LP |
21 | #include "string-util.h" |
22 | #include "swap.h" | |
2efa43dc | 23 | #include "udev-util.h" |
07630cea | 24 | #include "unit-name.h" |
9670d583 | 25 | #include "unit.h" |
5cb5a6ff | 26 | |
f50e0a01 | 27 | static const UnitActiveState state_translation_table[_DEVICE_STATE_MAX] = { |
1363eeca | 28 | [DEVICE_DEAD] = UNIT_INACTIVE, |
628c89cc | 29 | [DEVICE_TENTATIVE] = UNIT_ACTIVATING, |
1363eeca | 30 | [DEVICE_PLUGGED] = UNIT_ACTIVE, |
f50e0a01 LP |
31 | }; |
32 | ||
d0955f00 | 33 | static int device_dispatch_io(sd_device_monitor *monitor, sd_device *dev, void *userdata); |
718db961 | 34 | |
c072b84c YW |
35 | static int device_by_path(Manager *m, const char *path, Unit **ret) { |
36 | _cleanup_free_ char *e = NULL; | |
37 | Unit *u; | |
38 | int r; | |
39 | ||
40 | assert(m); | |
41 | assert(path); | |
42 | ||
43 | r = unit_name_from_path(path, ".device", &e); | |
44 | if (r < 0) | |
45 | return r; | |
46 | ||
47 | u = manager_get_unit(m, e); | |
48 | if (!u) | |
49 | return -ENOENT; | |
50 | ||
51 | if (ret) | |
52 | *ret = u; | |
53 | return 0; | |
54 | } | |
55 | ||
8fe914ec | 56 | static void device_unset_sysfs(Device *d) { |
f1421cc6 | 57 | Hashmap *devices; |
8fe914ec LP |
58 | |
59 | assert(d); | |
60 | ||
a7f241db LP |
61 | if (!d->sysfs) |
62 | return; | |
63 | ||
114e85d2 YW |
64 | /* Remove this unit from the chain of devices which share the same sysfs path. */ |
65 | ||
f1421cc6 | 66 | devices = UNIT(d)->manager->devices_by_sysfs; |
8fe914ec | 67 | |
114e85d2 YW |
68 | if (d->same_sysfs_prev) |
69 | /* If this is not the first unit, then simply remove this unit. */ | |
70 | d->same_sysfs_prev->same_sysfs_next = d->same_sysfs_next; | |
71 | else if (d->same_sysfs_next) | |
72 | /* If this is the first unit, replace with the next unit. */ | |
73 | assert_se(hashmap_replace(devices, d->same_sysfs_next->sysfs, d->same_sysfs_next) >= 0); | |
a7f241db | 74 | else |
114e85d2 | 75 | /* Otherwise, remove the entry. */ |
f1421cc6 | 76 | hashmap_remove(devices, d->sysfs); |
a7f241db | 77 | |
114e85d2 YW |
78 | if (d->same_sysfs_next) |
79 | d->same_sysfs_next->same_sysfs_prev = d->same_sysfs_prev; | |
80 | ||
81 | d->same_sysfs_prev = d->same_sysfs_next = NULL; | |
82 | ||
a1e58e8e | 83 | d->sysfs = mfree(d->sysfs); |
8fe914ec LP |
84 | } |
85 | ||
628c89cc | 86 | static int device_set_sysfs(Device *d, const char *sysfs) { |
ccd419f0 | 87 | _cleanup_free_ char *copy = NULL; |
628c89cc | 88 | Device *first; |
628c89cc LP |
89 | int r; |
90 | ||
91 | assert(d); | |
92 | ||
93 | if (streq_ptr(d->sysfs, sysfs)) | |
94 | return 0; | |
95 | ||
548f6937 | 96 | r = hashmap_ensure_allocated(&UNIT(d)->manager->devices_by_sysfs, &path_hash_ops); |
628c89cc LP |
97 | if (r < 0) |
98 | return r; | |
99 | ||
100 | copy = strdup(sysfs); | |
101 | if (!copy) | |
102 | return -ENOMEM; | |
103 | ||
104 | device_unset_sysfs(d); | |
105 | ||
106 | first = hashmap_get(UNIT(d)->manager->devices_by_sysfs, sysfs); | |
107 | LIST_PREPEND(same_sysfs, first, d); | |
108 | ||
109 | r = hashmap_replace(UNIT(d)->manager->devices_by_sysfs, copy, first); | |
110 | if (r < 0) { | |
111 | LIST_REMOVE(same_sysfs, first, d); | |
628c89cc LP |
112 | return r; |
113 | } | |
114 | ||
ccd419f0 | 115 | d->sysfs = TAKE_PTR(copy); |
7c4d1394 MS |
116 | unit_add_to_dbus_queue(UNIT(d)); |
117 | ||
628c89cc LP |
118 | return 0; |
119 | } | |
120 | ||
faf919f1 | 121 | static void device_init(Unit *u) { |
e9fa1bf7 | 122 | Device *d = ASSERT_PTR(DEVICE(u)); |
faf919f1 | 123 | |
e9fa1bf7 | 124 | assert(u->load_state == UNIT_STUB); |
faf919f1 | 125 | |
8fe914ec LP |
126 | /* In contrast to all other unit types we timeout jobs waiting |
127 | * for devices by default. This is because they otherwise wait | |
35b8ca3a | 128 | * indefinitely for plugged in devices, something which cannot |
8fe914ec LP |
129 | * happen for the other units since their operations time out |
130 | * anyway. */ | |
c9e120e0 | 131 | u->job_running_timeout = u->manager->defaults.device_timeout_usec; |
c8f4d764 | 132 | |
f1421cc6 | 133 | u->ignore_on_isolate = true; |
66f3fdbb LP |
134 | |
135 | d->deserialized_state = _DEVICE_STATE_INVALID; | |
faf919f1 LP |
136 | } |
137 | ||
87f0e418 | 138 | static void device_done(Unit *u) { |
e9fa1bf7 | 139 | Device *d = ASSERT_PTR(DEVICE(u)); |
e537352b | 140 | |
8fe914ec | 141 | device_unset_sysfs(d); |
1ea74fca | 142 | d->deserialized_sysfs = mfree(d->deserialized_sysfs); |
88116909 | 143 | d->wants_property = strv_free(d->wants_property); |
367a2597 | 144 | d->path = mfree(d->path); |
e537352b LP |
145 | } |
146 | ||
1d4c6f5b ZJS |
147 | static int device_load(Unit *u) { |
148 | int r; | |
149 | ||
c3620770 | 150 | r = unit_load_fragment_and_dropin(u, false); |
1d4c6f5b ZJS |
151 | if (r < 0) |
152 | return r; | |
153 | ||
154 | if (!u->description) { | |
e41db484 LP |
155 | /* Generate a description based on the path, to be used until the device is initialized |
156 | properly */ | |
1d4c6f5b ZJS |
157 | r = unit_name_to_path(u->id, &u->description); |
158 | if (r < 0) | |
159 | log_unit_debug_errno(u, r, "Failed to unescape name: %m"); | |
160 | } | |
161 | ||
162 | return 0; | |
163 | } | |
164 | ||
f50e0a01 LP |
165 | static void device_set_state(Device *d, DeviceState state) { |
166 | DeviceState old_state; | |
1363eeca | 167 | |
f50e0a01 | 168 | assert(d); |
5cb5a6ff | 169 | |
6fcbec6f LP |
170 | if (d->state != state) |
171 | bus_unit_send_pending_change_signal(UNIT(d), false); | |
172 | ||
f50e0a01 LP |
173 | old_state = d->state; |
174 | d->state = state; | |
5cb5a6ff | 175 | |
244f8055 LP |
176 | if (state == DEVICE_DEAD) |
177 | device_unset_sysfs(d); | |
178 | ||
e537352b | 179 | if (state != old_state) |
f2341e0a | 180 | log_unit_debug(UNIT(d), "Changed %s -> %s", device_state_to_string(old_state), device_state_to_string(state)); |
f50e0a01 | 181 | |
96b09de5 | 182 | unit_notify(UNIT(d), state_translation_table[old_state], state_translation_table[state], /* reload_success = */ true); |
f50e0a01 LP |
183 | } |
184 | ||
dce2d35c YW |
185 | static void device_found_changed(Device *d, DeviceFound previous, DeviceFound now) { |
186 | assert(d); | |
187 | ||
188 | /* Didn't exist before, but does now? if so, generate a new invocation ID for it */ | |
189 | if (previous == DEVICE_NOT_FOUND && now != DEVICE_NOT_FOUND) | |
190 | (void) unit_acquire_invocation_id(UNIT(d)); | |
191 | ||
192 | if (FLAGS_SET(now, DEVICE_FOUND_UDEV)) | |
193 | /* When the device is known to udev we consider it plugged. */ | |
194 | device_set_state(d, DEVICE_PLUGGED); | |
195 | else if (now != DEVICE_NOT_FOUND && !FLAGS_SET(previous, DEVICE_FOUND_UDEV)) | |
196 | /* If the device has not been seen by udev yet, but is now referenced by the kernel, then we assume the | |
197 | * kernel knows it now, and udev might soon too. */ | |
198 | device_set_state(d, DEVICE_TENTATIVE); | |
199 | else | |
200 | /* If nobody sees the device, or if the device was previously seen by udev and now is only referenced | |
201 | * from the kernel, then we consider the device is gone, the kernel just hasn't noticed it yet. */ | |
202 | device_set_state(d, DEVICE_DEAD); | |
203 | } | |
204 | ||
205 | static void device_update_found_one(Device *d, DeviceFound found, DeviceFound mask) { | |
206 | assert(d); | |
207 | ||
208 | if (MANAGER_IS_RUNNING(UNIT(d)->manager)) { | |
209 | DeviceFound n, previous; | |
210 | ||
211 | /* When we are already running, then apply the new mask right-away, and trigger state changes | |
212 | * right-away */ | |
213 | ||
214 | n = (d->found & ~mask) | (found & mask); | |
215 | if (n == d->found) | |
216 | return; | |
217 | ||
218 | previous = d->found; | |
219 | d->found = n; | |
220 | ||
221 | device_found_changed(d, previous, n); | |
222 | } else | |
223 | /* We aren't running yet, let's apply the new mask to the shadow variable instead, which we'll apply as | |
224 | * soon as we catch-up with the state. */ | |
225 | d->enumerated_found = (d->enumerated_found & ~mask) | (found & mask); | |
226 | } | |
227 | ||
228 | static void device_update_found_by_sysfs(Manager *m, const char *sysfs, DeviceFound found, DeviceFound mask) { | |
229 | Device *l; | |
230 | ||
231 | assert(m); | |
232 | assert(sysfs); | |
233 | ||
234 | if (mask == 0) | |
235 | return; | |
236 | ||
237 | l = hashmap_get(m->devices_by_sysfs, sysfs); | |
238 | LIST_FOREACH(same_sysfs, d, l) | |
239 | device_update_found_one(d, found, mask); | |
240 | } | |
241 | ||
242 | static void device_update_found_by_name(Manager *m, const char *path, DeviceFound found, DeviceFound mask) { | |
dce2d35c | 243 | Unit *u; |
dce2d35c YW |
244 | |
245 | assert(m); | |
246 | assert(path); | |
247 | ||
248 | if (mask == 0) | |
249 | return; | |
250 | ||
c072b84c | 251 | if (device_by_path(m, path, &u) < 0) |
dce2d35c YW |
252 | return; |
253 | ||
254 | device_update_found_one(DEVICE(u), found, mask); | |
255 | } | |
256 | ||
be847e82 | 257 | static int device_coldplug(Unit *u) { |
e9fa1bf7 | 258 | Device *d = ASSERT_PTR(DEVICE(u)); |
f50e0a01 | 259 | |
f50e0a01 LP |
260 | assert(d->state == DEVICE_DEAD); |
261 | ||
66f3fdbb | 262 | /* First, let's put the deserialized state and found mask into effect, if we have it. */ |
75d7b598 YW |
263 | if (d->deserialized_state < 0) |
264 | return 0; | |
265 | ||
266 | Manager *m = u->manager; | |
267 | DeviceFound found = d->deserialized_found; | |
268 | DeviceState state = d->deserialized_state; | |
269 | ||
270 | /* On initial boot, switch-root, reload, reexecute, the following happen: | |
271 | * 1. MANAGER_IS_RUNNING() == false | |
272 | * 2. enumerate devices: manager_enumerate() -> device_enumerate() | |
273 | * Device.enumerated_found is set. | |
54a4d715 | 274 | * 3. deserialize devices: manager_deserialize() -> device_deserialize_item() |
75d7b598 YW |
275 | * Device.deserialize_state and Device.deserialized_found are set. |
276 | * 4. coldplug devices: manager_coldplug() -> device_coldplug() | |
277 | * deserialized properties are copied to the main properties. | |
278 | * 5. MANAGER_IS_RUNNING() == true: manager_ready() | |
279 | * 6. catchup devices: manager_catchup() -> device_catchup() | |
280 | * Device.enumerated_found is applied to Device.found, and state is updated based on that. | |
281 | * | |
282 | * Notes: | |
283 | * - On initial boot, no udev database exists. Hence, no devices are enumerated in the step 2. | |
284 | * Also, there is no deserialized device. Device units are (a) generated based on dependencies of | |
285 | * other units, or (b) generated when uevents are received. | |
286 | * | |
3881fd40 | 287 | * - On switch-root, the udev database may be cleared, except for devices with sticky bit, i.e. |
32e27670 | 288 | * OPTIONS="db_persist". Hence, almost no devices are enumerated in the step 2. However, in |
54a4d715 YW |
289 | * general, we have several serialized devices. So, DEVICE_FOUND_UDEV bit in the |
290 | * Device.deserialized_found must be ignored, as udev rules in initrd and the main system are often | |
291 | * different. If the deserialized state is DEVICE_PLUGGED, we need to downgrade it to | |
292 | * DEVICE_TENTATIVE. Unlike the other starting mode, MANAGER_IS_SWITCHING_ROOT() is true when | |
293 | * device_coldplug() and device_catchup() are called. Hence, let's conditionalize the operations by | |
294 | * using the flag. After switch-root, systemd-udevd will (re-)process all devices, and the | |
295 | * Device.found and Device.state will be adjusted. | |
75d7b598 | 296 | * |
54a4d715 YW |
297 | * - On reload or reexecute, we can trust Device.enumerated_found, Device.deserialized_found, and |
298 | * Device.deserialized_state. Of course, deserialized parameters may be outdated, but the unit | |
299 | * state can be adjusted later by device_catchup() or uevents. */ | |
75d7b598 | 300 | |
7870de03 | 301 | if (MANAGER_IS_SWITCHING_ROOT(m) && |
4fc69e8a | 302 | !FLAGS_SET(d->enumerated_found, DEVICE_FOUND_UDEV)) { |
54a4d715 YW |
303 | |
304 | /* The device has not been enumerated. On switching-root, such situation is natural. See the | |
305 | * above comment. To prevent problematic state transition active → dead → active, let's | |
306 | * drop the DEVICE_FOUND_UDEV flag and downgrade state to DEVICE_TENTATIVE(activating). See | |
307 | * issue #12953 and #23208. */ | |
308 | found &= ~DEVICE_FOUND_UDEV; | |
75d7b598 | 309 | if (state == DEVICE_PLUGGED) |
54a4d715 | 310 | state = DEVICE_TENTATIVE; |
b6c86ae2 YW |
311 | |
312 | /* Also check the validity of the device syspath. Without this check, if the device was | |
313 | * removed while switching root, it would never go to inactive state, as both Device.found | |
314 | * and Device.enumerated_found do not have the DEVICE_FOUND_UDEV flag, so device_catchup() in | |
315 | * device_update_found_one() does nothing in most cases. See issue #25106. Note that the | |
316 | * syspath field is only serialized when systemd is sufficiently new and the device has been | |
317 | * already processed by udevd. */ | |
318 | if (d->deserialized_sysfs) { | |
319 | _cleanup_(sd_device_unrefp) sd_device *dev = NULL; | |
320 | ||
321 | if (sd_device_new_from_syspath(&dev, d->deserialized_sysfs) < 0) | |
322 | state = DEVICE_DEAD; | |
323 | } | |
75d7b598 | 324 | } |
918e6f1c | 325 | |
75d7b598 | 326 | if (d->found == found && d->state == state) |
66f3fdbb | 327 | return 0; |
f50e0a01 | 328 | |
75d7b598 YW |
329 | d->found = found; |
330 | device_set_state(d, state); | |
f50e0a01 LP |
331 | return 0; |
332 | } | |
333 | ||
66f3fdbb | 334 | static void device_catchup(Unit *u) { |
e9fa1bf7 | 335 | Device *d = ASSERT_PTR(DEVICE(u)); |
66f3fdbb | 336 | |
f33bc879 | 337 | /* Second, let's update the state with the enumerated state */ |
66f3fdbb LP |
338 | device_update_found_one(d, d->enumerated_found, DEVICE_FOUND_MASK); |
339 | } | |
340 | ||
75d0aba4 YW |
341 | static const struct { |
342 | DeviceFound flag; | |
343 | const char *name; | |
344 | } device_found_map[] = { | |
66f3fdbb LP |
345 | { DEVICE_FOUND_UDEV, "found-udev" }, |
346 | { DEVICE_FOUND_MOUNT, "found-mount" }, | |
347 | { DEVICE_FOUND_SWAP, "found-swap" }, | |
75d0aba4 YW |
348 | }; |
349 | ||
350 | static int device_found_to_string_many(DeviceFound flags, char **ret) { | |
351 | _cleanup_free_ char *s = NULL; | |
75d0aba4 YW |
352 | |
353 | assert(ret); | |
354 | ||
fe96c0f8 | 355 | for (size_t i = 0; i < ELEMENTSOF(device_found_map); i++) { |
6e0f878e | 356 | if (!FLAGS_SET(flags, device_found_map[i].flag)) |
75d0aba4 YW |
357 | continue; |
358 | ||
c2bc710b | 359 | if (!strextend_with_separator(&s, ",", device_found_map[i].name)) |
75d0aba4 YW |
360 | return -ENOMEM; |
361 | } | |
362 | ||
363 | *ret = TAKE_PTR(s); | |
364 | ||
365 | return 0; | |
366 | } | |
367 | ||
368 | static int device_found_from_string_many(const char *name, DeviceFound *ret) { | |
369 | DeviceFound flags = 0; | |
370 | int r; | |
371 | ||
372 | assert(ret); | |
373 | ||
374 | for (;;) { | |
375 | _cleanup_free_ char *word = NULL; | |
376 | DeviceFound f = 0; | |
377 | unsigned i; | |
378 | ||
379 | r = extract_first_word(&name, &word, ",", 0); | |
380 | if (r < 0) | |
381 | return r; | |
382 | if (r == 0) | |
383 | break; | |
384 | ||
69ce73d1 | 385 | for (i = 0; i < ELEMENTSOF(device_found_map); i++) |
75d0aba4 YW |
386 | if (streq(word, device_found_map[i].name)) { |
387 | f = device_found_map[i].flag; | |
388 | break; | |
389 | } | |
390 | ||
391 | if (f == 0) | |
392 | return -EINVAL; | |
393 | ||
394 | flags |= f; | |
395 | } | |
396 | ||
397 | *ret = flags; | |
398 | return 0; | |
399 | } | |
400 | ||
f6200941 | 401 | static int device_serialize(Unit *u, FILE *f, FDSet *fds) { |
e9fa1bf7 | 402 | Device *d = ASSERT_PTR(DEVICE(u)); |
75d0aba4 | 403 | _cleanup_free_ char *s = NULL; |
f6200941 | 404 | |
f6200941 LP |
405 | assert(f); |
406 | assert(fds); | |
407 | ||
1ea74fca YW |
408 | if (d->sysfs) |
409 | (void) serialize_item(f, "sysfs", d->sysfs); | |
410 | ||
367a2597 YW |
411 | if (d->path) |
412 | (void) serialize_item(f, "path", d->path); | |
413 | ||
d68c645b | 414 | (void) serialize_item(f, "state", device_state_to_string(d->state)); |
75d0aba4 | 415 | |
43ba7d71 | 416 | if (device_found_to_string_many(d->found, &s) >= 0) |
d68c645b | 417 | (void) serialize_item(f, "found", s); |
0108f6ec DM |
418 | |
419 | return 0; | |
f6200941 LP |
420 | } |
421 | ||
422 | static int device_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
e9fa1bf7 | 423 | Device *d = ASSERT_PTR(DEVICE(u)); |
75d0aba4 | 424 | int r; |
f6200941 | 425 | |
f6200941 LP |
426 | assert(key); |
427 | assert(value); | |
428 | assert(fds); | |
429 | ||
1ea74fca YW |
430 | if (streq(key, "sysfs")) { |
431 | if (!d->deserialized_sysfs) { | |
432 | d->deserialized_sysfs = strdup(value); | |
433 | if (!d->deserialized_sysfs) | |
434 | log_oom_debug(); | |
435 | } | |
436 | ||
437 | } else if (streq(key, "path")) { | |
367a2597 YW |
438 | if (!d->path) { |
439 | d->path = strdup(value); | |
440 | if (!d->path) | |
441 | log_oom_debug(); | |
442 | } | |
443 | ||
444 | } else if (streq(key, "state")) { | |
f6200941 LP |
445 | DeviceState state; |
446 | ||
447 | state = device_state_from_string(value); | |
448 | if (state < 0) | |
8bb2c8c9 | 449 | log_unit_debug(u, "Failed to parse state value, ignoring: %s", value); |
f6200941 LP |
450 | else |
451 | d->deserialized_state = state; | |
918e6f1c FB |
452 | |
453 | } else if (streq(key, "found")) { | |
66f3fdbb | 454 | r = device_found_from_string_many(value, &d->deserialized_found); |
75d0aba4 | 455 | if (r < 0) |
5e1ee764 | 456 | log_unit_debug_errno(u, r, "Failed to parse found value '%s', ignoring: %m", value); |
918e6f1c | 457 | |
f6200941 | 458 | } else |
f2341e0a | 459 | log_unit_debug(u, "Unknown serialization key: %s", key); |
f6200941 LP |
460 | |
461 | return 0; | |
462 | } | |
463 | ||
f50e0a01 | 464 | static void device_dump(Unit *u, FILE *f, const char *prefix) { |
e9fa1bf7 | 465 | Device *d = ASSERT_PTR(DEVICE(u)); |
4d86c235 | 466 | _cleanup_free_ char *s = NULL; |
5cb5a6ff | 467 | |
e9fa1bf7 MY |
468 | assert(f); |
469 | assert(prefix); | |
5cb5a6ff | 470 | |
4d86c235 ZJS |
471 | (void) device_found_to_string_many(d->found, &s); |
472 | ||
5cb5a6ff | 473 | fprintf(f, |
25ac040b | 474 | "%sDevice State: %s\n" |
367a2597 | 475 | "%sDevice Path: %s\n" |
4d86c235 ZJS |
476 | "%sSysfs Path: %s\n" |
477 | "%sFound: %s\n", | |
a16e1123 | 478 | prefix, device_state_to_string(d->state), |
367a2597 | 479 | prefix, strna(d->path), |
4d86c235 ZJS |
480 | prefix, strna(d->sysfs), |
481 | prefix, strna(s)); | |
88116909 | 482 | |
de010b0b YW |
483 | STRV_FOREACH(i, d->wants_property) |
484 | fprintf(f, "%sudev SYSTEMD_WANTS: %s\n", | |
485 | prefix, *i); | |
f50e0a01 LP |
486 | } |
487 | ||
d1e8e8b5 | 488 | static UnitActiveState device_active_state(Unit *u) { |
e9fa1bf7 | 489 | Device *d = ASSERT_PTR(DEVICE(u)); |
f50e0a01 | 490 | |
e9fa1bf7 | 491 | return state_translation_table[d->state]; |
25ac040b LP |
492 | } |
493 | ||
d1e8e8b5 | 494 | static const char *device_sub_state_to_string(Unit *u) { |
e9fa1bf7 | 495 | Device *d = ASSERT_PTR(DEVICE(u)); |
10a94420 | 496 | |
e9fa1bf7 | 497 | return device_state_to_string(d->state); |
10a94420 LP |
498 | } |
499 | ||
4366e598 | 500 | static int device_update_description(Unit *u, sd_device *dev, const char *path) { |
1d4c6f5b ZJS |
501 | _cleanup_free_ char *j = NULL; |
502 | const char *model, *label, *desc; | |
628c89cc | 503 | int r; |
965e5c5d LP |
504 | |
505 | assert(u); | |
965e5c5d LP |
506 | assert(path); |
507 | ||
1d4c6f5b ZJS |
508 | desc = path; |
509 | ||
3cc7a9fd | 510 | if (dev && device_get_model_string(dev, &model) >= 0) { |
1d4c6f5b | 511 | desc = model; |
965e5c5d LP |
512 | |
513 | /* Try to concatenate the device model string with a label, if there is one */ | |
4366e598 YW |
514 | if (sd_device_get_property_value(dev, "ID_FS_LABEL", &label) >= 0 || |
515 | sd_device_get_property_value(dev, "ID_PART_ENTRY_NAME", &label) >= 0 || | |
516 | sd_device_get_property_value(dev, "ID_PART_ENTRY_NUMBER", &label) >= 0) { | |
965e5c5d | 517 | |
1d4c6f5b | 518 | desc = j = strjoin(model, " ", label); |
ea8ec43b LP |
519 | if (!j) |
520 | return log_oom(); | |
1d4c6f5b ZJS |
521 | } |
522 | } | |
ea8ec43b | 523 | |
1d4c6f5b | 524 | r = unit_set_description(u, desc); |
628c89cc | 525 | if (r < 0) |
ea8ec43b | 526 | return log_unit_error_errno(u, r, "Failed to set device description: %m"); |
965e5c5d | 527 | |
ea8ec43b | 528 | return 0; |
965e5c5d LP |
529 | } |
530 | ||
4366e598 | 531 | static int device_add_udev_wants(Unit *u, sd_device *dev) { |
e9fa1bf7 | 532 | Device *d = ASSERT_PTR(DEVICE(u)); |
88116909 | 533 | _cleanup_strv_free_ char **added = NULL; |
de040543 | 534 | const char *wants, *property; |
965e5c5d LP |
535 | int r; |
536 | ||
965e5c5d LP |
537 | assert(dev); |
538 | ||
463d0d15 | 539 | property = MANAGER_IS_USER(u->manager) ? "SYSTEMD_USER_WANTS" : "SYSTEMD_WANTS"; |
de040543 | 540 | |
4366e598 YW |
541 | r = sd_device_get_property_value(dev, property, &wants); |
542 | if (r < 0) | |
de040543 LP |
543 | return 0; |
544 | ||
545 | for (;;) { | |
ceed8f0c | 546 | _cleanup_free_ char *word = NULL, *k = NULL; |
965e5c5d | 547 | |
4ec85141 | 548 | r = extract_first_word(&wants, &word, NULL, EXTRACT_UNQUOTE); |
ceed8f0c | 549 | if (r == 0) |
88116909 | 550 | break; |
ceed8f0c ZJS |
551 | if (r == -ENOMEM) |
552 | return log_oom(); | |
553 | if (r < 0) | |
dcebc9ba | 554 | return log_unit_error_errno(u, r, "Failed to parse property %s with value %s: %m", property, wants); |
965e5c5d | 555 | |
88116909 | 556 | if (unit_name_is_valid(word, UNIT_NAME_TEMPLATE) && d->sysfs) { |
dcebc9ba LP |
557 | _cleanup_free_ char *escaped = NULL; |
558 | ||
559 | /* If the unit name is specified as template, then automatically fill in the sysfs path of the | |
560 | * device as instance name, properly escaped. */ | |
561 | ||
88116909 | 562 | r = unit_name_path_escape(d->sysfs, &escaped); |
dcebc9ba | 563 | if (r < 0) |
88116909 | 564 | return log_unit_error_errno(u, r, "Failed to escape %s: %m", d->sysfs); |
dcebc9ba LP |
565 | |
566 | r = unit_name_replace_instance(word, escaped, &k); | |
567 | if (r < 0) | |
568 | return log_unit_error_errno(u, r, "Failed to build %s instance of template %s: %m", escaped, word); | |
569 | } else { | |
570 | /* If this is not a template, then let's mangle it so, that it becomes a valid unit name. */ | |
571 | ||
37cbc1d5 | 572 | r = unit_name_mangle(word, UNIT_NAME_MANGLE_WARN, &k); |
dcebc9ba LP |
573 | if (r < 0) |
574 | return log_unit_error_errno(u, r, "Failed to mangle unit name \"%s\": %m", word); | |
575 | } | |
965e5c5d | 576 | |
35d8c19a | 577 | r = unit_add_dependency_by_name(u, UNIT_WANTS, k, true, UNIT_DEPENDENCY_UDEV); |
965e5c5d | 578 | if (r < 0) |
de040543 | 579 | return log_unit_error_errno(u, r, "Failed to add Wants= dependency: %m"); |
88116909 | 580 | |
47e72170 | 581 | r = strv_consume(&added, TAKE_PTR(k)); |
88116909 LP |
582 | if (r < 0) |
583 | return log_oom(); | |
965e5c5d | 584 | } |
88116909 | 585 | |
de010b0b | 586 | if (d->state != DEVICE_DEAD) |
88116909 LP |
587 | /* So here's a special hack, to compensate for the fact that the udev database's reload cycles are not |
588 | * synchronized with our own reload cycles: when we detect that the SYSTEMD_WANTS property of a device | |
033fe650 YW |
589 | * changes while the device unit is already up, let's skip to trigger units that were already listed |
590 | * and are active, and start units otherwise. This typically happens during the boot-time switch root | |
591 | * transition, as udev devices will generally already be up in the initrd, but SYSTEMD_WANTS properties | |
592 | * get then added through udev rules only available on the host system, and thus only when the initial | |
593 | * udev coldplug trigger runs. | |
88116909 LP |
594 | * |
595 | * We do this only if the device has been up already when we parse this, as otherwise the usual | |
596 | * dependency logic that is run from the dead → plugged transition will trigger these deps. */ | |
88116909 LP |
597 | STRV_FOREACH(i, added) { |
598 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; | |
599 | ||
033fe650 YW |
600 | if (strv_contains(d->wants_property, *i)) { |
601 | Unit *v; | |
602 | ||
603 | v = manager_get_unit(u->manager, *i); | |
604 | if (v && UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(v))) | |
605 | continue; /* The unit was already listed and is running. */ | |
606 | } | |
88116909 | 607 | |
50cbaba4 | 608 | r = manager_add_job_by_name(u->manager, JOB_START, *i, JOB_FAIL, NULL, &error, NULL); |
88116909 | 609 | if (r < 0) |
b4e2fcb6 YW |
610 | log_unit_full_errno(u, sd_bus_error_has_name(&error, BUS_ERROR_NO_SUCH_UNIT) ? LOG_DEBUG : LOG_WARNING, r, |
611 | "Failed to enqueue %s job, ignoring: %s", property, bus_error_message(&error, r)); | |
88116909 | 612 | } |
88116909 | 613 | |
8cc53fae | 614 | return strv_free_and_replace(d->wants_property, added); |
965e5c5d LP |
615 | } |
616 | ||
4366e598 | 617 | static bool device_is_bound_by_mounts(Device *d, sd_device *dev) { |
40b1a32c | 618 | int r; |
ebc8968b FB |
619 | |
620 | assert(d); | |
621 | assert(dev); | |
622 | ||
4212fa83 YW |
623 | r = device_get_property_bool(dev, "SYSTEMD_MOUNT_DEVICE_BOUND"); |
624 | if (r < 0 && r != -ENOENT) | |
625 | log_device_warning_errno(dev, r, "Failed to parse SYSTEMD_MOUNT_DEVICE_BOUND= udev property, ignoring: %m"); | |
ebc8968b | 626 | |
4212fa83 | 627 | d->bind_mounts = r > 0; |
40b1a32c LP |
628 | |
629 | return d->bind_mounts; | |
ebc8968b FB |
630 | } |
631 | ||
86cdffd1 | 632 | static void device_upgrade_mount_deps(Unit *u) { |
ebc8968b | 633 | Unit *other; |
eef85c4a | 634 | void *v; |
ebc8968b FB |
635 | int r; |
636 | ||
eef85c4a LP |
637 | /* Let's upgrade Requires= to BindsTo= on us. (Used when SYSTEMD_MOUNT_DEVICE_BOUND is set) */ |
638 | ||
e9fa1bf7 MY |
639 | assert(u); |
640 | ||
15ed3c3a | 641 | HASHMAP_FOREACH_KEY(v, other, unit_get_dependencies(u, UNIT_REQUIRED_BY)) { |
ebc8968b FB |
642 | if (other->type != UNIT_MOUNT) |
643 | continue; | |
644 | ||
eef85c4a | 645 | r = unit_add_dependency(other, UNIT_BINDS_TO, u, true, UNIT_DEPENDENCY_UDEV); |
ebc8968b | 646 | if (r < 0) |
86cdffd1 | 647 | log_unit_warning_errno(u, r, "Failed to add BindsTo= dependency between device and mount unit, ignoring: %m"); |
ebc8968b | 648 | } |
ebc8968b FB |
649 | } |
650 | ||
4228306b | 651 | static int device_setup_unit(Manager *m, sd_device *dev, const char *path, bool main, Set **units) { |
dd309fcd | 652 | _cleanup_(unit_freep) Unit *new_unit = NULL; |
628c89cc | 653 | _cleanup_free_ char *e = NULL; |
2005219f | 654 | const char *sysfs = NULL; |
dd309fcd | 655 | Unit *u; |
965e5c5d | 656 | int r; |
25ac040b LP |
657 | |
658 | assert(m); | |
965e5c5d | 659 | assert(path); |
25ac040b | 660 | |
2005219f | 661 | if (dev) { |
4366e598 | 662 | r = sd_device_get_syspath(dev, &sysfs); |
9951c8df LP |
663 | if (r < 0) |
664 | return log_device_debug_errno(dev, r, "Couldn't get syspath from device, ignoring: %m"); | |
2005219f | 665 | } |
7f275a9f | 666 | |
7410616c | 667 | r = unit_name_from_path(path, ".device", &e); |
a7fb1f2e | 668 | if (r < 0) |
ad172d19 | 669 | return log_struct_errno( |
a7fb1f2e | 670 | LOG_WARNING, r, |
ad172d19 LP |
671 | "MESSAGE_ID=" SD_MESSAGE_DEVICE_PATH_NOT_SUITABLE_STR, |
672 | "DEVICE=%s", path, | |
92663a5e ZJS |
673 | LOG_MESSAGE("Failed to generate valid unit name from device path '%s', ignoring device: %m", |
674 | path)); | |
628c89cc LP |
675 | |
676 | u = manager_get_unit(m, e); | |
38b9b72e | 677 | if (u) { |
66f3fdbb LP |
678 | /* The device unit can still be present even if the device was unplugged: a mount unit can reference it |
679 | * hence preventing the GC to have garbaged it. That's desired since the device unit may have a | |
680 | * dependency on the mount unit which was added during the loading of the later. When the device is | |
681 | * plugged the sysfs might not be initialized yet, as we serialize the device's state but do not | |
682 | * serialize the sysfs path across reloads/reexecs. Hence, when coming back from a reload/restart we | |
4a1a1caf YW |
683 | * might have the state valid, but not the sysfs path. Also, there is another possibility; when multiple |
684 | * devices have the same devlink (e.g. /dev/disk/by-uuid/xxxx), adding/updating/removing one of the | |
0b75493d | 685 | * device causes syspath change. Hence, let's always update sysfs path. */ |
25ac040b | 686 | |
5238e957 | 687 | /* Let's remove all dependencies generated due to udev properties. We'll re-add whatever is configured |
38b9b72e LP |
688 | * now below. */ |
689 | unit_remove_dependencies(u, UNIT_DEPENDENCY_UDEV); | |
dd309fcd | 690 | |
38b9b72e | 691 | } else { |
dd309fcd YW |
692 | r = unit_new_for_name(m, sizeof(Device), e, &new_unit); |
693 | if (r < 0) | |
694 | return log_device_error_errno(dev, r, "Failed to allocate device unit %s: %m", e); | |
aab14b13 | 695 | |
dd309fcd | 696 | u = new_unit; |
25ac040b | 697 | |
ee6cb288 | 698 | unit_add_to_load_queue(u); |
38b9b72e | 699 | } |
ee6cb288 | 700 | |
e9fa1bf7 MY |
701 | Device *d = ASSERT_PTR(DEVICE(u)); |
702 | ||
703 | if (!d->path) { | |
704 | d->path = strdup(path); | |
705 | if (!d->path) | |
367a2597 YW |
706 | return log_oom(); |
707 | } | |
708 | ||
66f3fdbb | 709 | /* If this was created via some dependency and has not actually been seen yet ->sysfs will not be |
ee6cb288 | 710 | * initialized. Hence initialize it if necessary. */ |
2005219f | 711 | if (sysfs) { |
e9fa1bf7 | 712 | r = device_set_sysfs(d, sysfs); |
dd309fcd YW |
713 | if (r < 0) |
714 | return log_unit_error_errno(u, r, "Failed to set sysfs path %s: %m", sysfs); | |
ee6cb288 | 715 | |
66f3fdbb | 716 | /* The additional systemd udev properties we only interpret for the main object */ |
2005219f MP |
717 | if (main) |
718 | (void) device_add_udev_wants(u, dev); | |
719 | } | |
25ac040b | 720 | |
1d4c6f5b ZJS |
721 | (void) device_update_description(u, dev, path); |
722 | ||
75a50eb0 LP |
723 | /* So the user wants the mount units to be bound to the device but a mount unit might has been seen |
724 | * by systemd before the device appears on its radar. In this case the device unit is partially | |
725 | * initialized and includes the deps on the mount unit but at that time the "bind mounts" flag wasn't | |
726 | * present. Fix this up now. */ | |
e9fa1bf7 | 727 | if (dev && device_is_bound_by_mounts(d, dev)) |
ebc8968b | 728 | device_upgrade_mount_deps(u); |
f94ea366 | 729 | |
4228306b | 730 | if (units) { |
e9fa1bf7 | 731 | r = set_ensure_put(units, NULL, d); |
4228306b YW |
732 | if (r < 0) |
733 | return log_unit_error_errno(u, r, "Failed to store unit: %m"); | |
734 | } | |
735 | ||
dd309fcd | 736 | TAKE_PTR(new_unit); |
25ac040b | 737 | return 0; |
25ac040b LP |
738 | } |
739 | ||
dce2d35c YW |
740 | static bool device_is_ready(sd_device *dev) { |
741 | int r; | |
742 | ||
743 | assert(dev); | |
744 | ||
1cb89339 YW |
745 | if (device_for_action(dev, SD_DEVICE_REMOVE)) |
746 | return false; | |
747 | ||
dce2d35c YW |
748 | r = device_is_renaming(dev); |
749 | if (r < 0) | |
750 | log_device_warning_errno(dev, r, "Failed to check if device is renaming, assuming device is not renaming: %m"); | |
751 | if (r > 0) { | |
752 | log_device_debug(dev, "Device busy: device is renaming"); | |
753 | return false; | |
754 | } | |
755 | ||
756 | /* Is it really tagged as 'systemd' right now? */ | |
757 | r = sd_device_has_current_tag(dev, "systemd"); | |
758 | if (r < 0) | |
759 | log_device_warning_errno(dev, r, "Failed to check if device has \"systemd\" tag, assuming device is not tagged with \"systemd\": %m"); | |
760 | if (r == 0) | |
761 | log_device_debug(dev, "Device busy: device is not tagged with \"systemd\""); | |
762 | if (r <= 0) | |
763 | return false; | |
764 | ||
765 | r = device_get_property_bool(dev, "SYSTEMD_READY"); | |
766 | if (r < 0 && r != -ENOENT) | |
767 | log_device_warning_errno(dev, r, "Failed to get device SYSTEMD_READY property, assuming device does not have \"SYSTEMD_READY\" property: %m"); | |
768 | if (r == 0) | |
769 | log_device_debug(dev, "Device busy: SYSTEMD_READY property from device is false"); | |
770 | ||
771 | return r != 0; | |
772 | } | |
773 | ||
4228306b | 774 | static int device_setup_devlink_unit_one(Manager *m, const char *devlink, Set **ready_units, Set **not_ready_units) { |
4a1a1caf | 775 | _cleanup_(sd_device_unrefp) sd_device *dev = NULL; |
4228306b | 776 | Unit *u; |
4a1a1caf YW |
777 | |
778 | assert(m); | |
779 | assert(devlink); | |
4228306b YW |
780 | assert(ready_units); |
781 | assert(not_ready_units); | |
4a1a1caf | 782 | |
4228306b YW |
783 | if (sd_device_new_from_devname(&dev, devlink) >= 0 && device_is_ready(dev)) |
784 | return device_setup_unit(m, dev, devlink, /* main = */ false, ready_units); | |
4a1a1caf | 785 | |
4228306b YW |
786 | /* the devlink is already removed or not ready */ |
787 | if (device_by_path(m, devlink, &u) < 0) | |
788 | return 0; /* The corresponding .device unit not found. That's fine. */ | |
4a1a1caf | 789 | |
4228306b | 790 | return set_ensure_put(not_ready_units, NULL, DEVICE(u)); |
4a1a1caf YW |
791 | } |
792 | ||
4228306b YW |
793 | static int device_setup_extra_units(Manager *m, sd_device *dev, Set **ready_units, Set **not_ready_units) { |
794 | _cleanup_strv_free_ char **aliases = NULL; | |
a1af8372 | 795 | const char *syspath, *devname = NULL; |
4228306b | 796 | Device *l; |
4a1a1caf YW |
797 | int r; |
798 | ||
799 | assert(m); | |
800 | assert(dev); | |
4228306b YW |
801 | assert(ready_units); |
802 | assert(not_ready_units); | |
4a1a1caf YW |
803 | |
804 | r = sd_device_get_syspath(dev, &syspath); | |
805 | if (r < 0) | |
806 | return r; | |
807 | ||
4228306b | 808 | (void) sd_device_get_devname(dev, &devname); |
4a1a1caf | 809 | |
4228306b YW |
810 | /* devlink units */ |
811 | FOREACH_DEVICE_DEVLINK(dev, devlink) { | |
812 | /* These are a kind of special devlink. They should be always unique, but neither persistent | |
813 | * nor predictable. Hence, let's refuse them. See also the comments for alias units below. */ | |
4a1a1caf YW |
814 | if (PATH_STARTSWITH_SET(devlink, "/dev/block/", "/dev/char/")) |
815 | continue; | |
816 | ||
4228306b YW |
817 | (void) device_setup_devlink_unit_one(m, devlink, ready_units, not_ready_units); |
818 | } | |
4a1a1caf | 819 | |
4228306b YW |
820 | if (device_is_ready(dev)) { |
821 | const char *s; | |
4a1a1caf | 822 | |
4228306b YW |
823 | r = sd_device_get_property_value(dev, "SYSTEMD_ALIAS", &s); |
824 | if (r < 0 && r != -ENOENT) | |
825 | log_device_warning_errno(dev, r, "Failed to get SYSTEMD_ALIAS property, ignoring: %m"); | |
826 | if (r >= 0) { | |
827 | r = strv_split_full(&aliases, s, NULL, EXTRACT_UNQUOTE); | |
828 | if (r < 0) | |
829 | log_device_warning_errno(dev, r, "Failed to parse SYSTEMD_ALIAS property, ignoring: %m"); | |
830 | } | |
4a1a1caf YW |
831 | } |
832 | ||
4228306b YW |
833 | /* alias units */ |
834 | STRV_FOREACH(alias, aliases) { | |
835 | if (!path_is_absolute(*alias)) { | |
836 | log_device_warning(dev, "The alias \"%s\" specified in SYSTEMD_ALIAS is not an absolute path, ignoring.", *alias); | |
837 | continue; | |
838 | } | |
4a1a1caf | 839 | |
c352110a YW |
840 | if (!path_is_safe(*alias)) { |
841 | log_device_warning(dev, "The alias \"%s\" specified in SYSTEMD_ALIAS is not safe, ignoring.", *alias); | |
4228306b YW |
842 | continue; |
843 | } | |
4a1a1caf | 844 | |
4228306b YW |
845 | /* Note, even if the devlink is not persistent, LVM expects /dev/block/ symlink units exist. |
846 | * To achieve that, they set the path to SYSTEMD_ALIAS. Hence, we cannot refuse aliases start | |
847 | * with /dev/, unfortunately. */ | |
4a1a1caf | 848 | |
4228306b YW |
849 | (void) device_setup_unit(m, dev, *alias, /* main = */ false, ready_units); |
850 | } | |
4a1a1caf YW |
851 | |
852 | l = hashmap_get(m->devices_by_sysfs, syspath); | |
853 | LIST_FOREACH(same_sysfs, d, l) { | |
4a1a1caf YW |
854 | if (!d->path) |
855 | continue; | |
856 | ||
4228306b YW |
857 | if (path_equal(d->path, syspath)) |
858 | continue; /* This is the main unit. */ | |
4a1a1caf | 859 | |
4228306b YW |
860 | if (devname && path_equal(d->path, devname)) |
861 | continue; /* This is the real device node. */ | |
4a1a1caf | 862 | |
4228306b YW |
863 | if (device_has_devlink(dev, d->path)) |
864 | continue; /* The devlink was already processed in the above loop. */ | |
4a1a1caf | 865 | |
4228306b YW |
866 | if (strv_contains(aliases, d->path)) |
867 | continue; /* This is already processed in the above, and ready. */ | |
4a1a1caf | 868 | |
4228306b YW |
869 | if (path_startswith(d->path, "/dev/")) |
870 | /* This is a devlink unit. Check existence and update syspath. */ | |
871 | (void) device_setup_devlink_unit_one(m, d->path, ready_units, not_ready_units); | |
872 | else | |
873 | /* This is an alias unit of dropped or not ready device. */ | |
874 | (void) set_ensure_put(not_ready_units, NULL, d); | |
4a1a1caf YW |
875 | } |
876 | ||
4a1a1caf YW |
877 | return 0; |
878 | } | |
879 | ||
4228306b YW |
880 | static int device_setup_units(Manager *m, sd_device *dev, Set **ready_units, Set **not_ready_units) { |
881 | const char *syspath, *devname = NULL; | |
003ac9d0 | 882 | int r; |
8fe914ec LP |
883 | |
884 | assert(m); | |
1363eeca | 885 | assert(dev); |
4228306b YW |
886 | assert(ready_units); |
887 | assert(not_ready_units); | |
8fe914ec | 888 | |
4228306b YW |
889 | r = sd_device_get_syspath(dev, &syspath); |
890 | if (r < 0) | |
891 | return log_device_debug_errno(dev, r, "Couldn't get syspath from device, ignoring: %m"); | |
8fe914ec | 892 | |
4228306b YW |
893 | /* First, process the main (that is, points to the syspath) and (real, not symlink) devnode units. */ |
894 | if (device_for_action(dev, SD_DEVICE_REMOVE)) | |
30fd9a2d | 895 | /* If the device is removed, the main and devnode units will be removed by |
4228306b YW |
896 | * device_update_found_by_sysfs() in device_dispatch_io(). Hence, it is not necessary to |
897 | * store them to not_ready_units, and we have nothing to do here. | |
898 | * | |
899 | * Note, still we need to process devlink units below, as a devlink previously points to this | |
900 | * device may still exist and now point to another device node. That is, do not forget to | |
901 | * call device_setup_extra_units(). */ | |
902 | ; | |
903 | else if (device_is_ready(dev)) { | |
904 | /* Add the main unit named after the syspath. If this one fails, don't bother with the rest, | |
905 | * as this one shall be the main device unit the others just follow. (Compare with how | |
906 | * device_following() is implemented, see below, which looks for the sysfs device.) */ | |
907 | r = device_setup_unit(m, dev, syspath, /* main = */ true, ready_units); | |
908 | if (r < 0) | |
909 | return r; | |
8fe914ec | 910 | |
4228306b YW |
911 | /* Add an additional unit for the device node */ |
912 | if (sd_device_get_devname(dev, &devname) >= 0) | |
913 | (void) device_setup_unit(m, dev, devname, /* main = */ false, ready_units); | |
4366e598 | 914 | |
4228306b YW |
915 | } else { |
916 | Unit *u; | |
8fe914ec | 917 | |
4228306b | 918 | /* If the device exists but not ready, then save the units and unset udev bits later. */ |
f1421cc6 | 919 | |
4228306b YW |
920 | if (device_by_path(m, syspath, &u) >= 0) { |
921 | r = set_ensure_put(not_ready_units, NULL, DEVICE(u)); | |
922 | if (r < 0) | |
923 | log_unit_debug_errno(u, r, "Failed to store unit, ignoring: %m"); | |
924 | } | |
925 | ||
926 | if (sd_device_get_devname(dev, &devname) >= 0 && | |
927 | device_by_path(m, devname, &u) >= 0) { | |
928 | r = set_ensure_put(not_ready_units, NULL, DEVICE(u)); | |
929 | if (r < 0) | |
930 | log_unit_debug_errno(u, r, "Failed to store unit, ignoring: %m"); | |
931 | } | |
8fe914ec | 932 | } |
4228306b YW |
933 | |
934 | /* Next, add/update additional .device units point to aliases and symlinks. */ | |
935 | (void) device_setup_extra_units(m, dev, ready_units, not_ready_units); | |
a4cb8afb YW |
936 | |
937 | /* Safety check: no unit should be in ready_units and not_ready_units simultaneously. */ | |
938 | Unit *u; | |
939 | SET_FOREACH(u, *not_ready_units) | |
940 | if (set_remove(*ready_units, u)) | |
3b51a183 | 941 | log_unit_error(u, "Cannot activate and deactivate the unit simultaneously. Deactivating."); |
a4cb8afb | 942 | |
4228306b | 943 | return 0; |
8fe914ec LP |
944 | } |
945 | ||
a7f241db | 946 | static Unit *device_following(Unit *u) { |
e9fa1bf7 | 947 | Device *d = ASSERT_PTR(DEVICE(u)), *first = NULL; |
a7f241db | 948 | |
ac155bb8 | 949 | if (startswith(u->id, "sys-")) |
a7f241db LP |
950 | return NULL; |
951 | ||
952 | /* Make everybody follow the unit that's named after the sysfs path */ | |
bd335c96 | 953 | LIST_FOREACH(same_sysfs, other, d->same_sysfs_next) |
1124fe6f | 954 | if (startswith(UNIT(other)->id, "sys-")) |
a7f241db LP |
955 | return UNIT(other); |
956 | ||
bd335c96 | 957 | LIST_FOREACH_BACKWARDS(same_sysfs, other, d->same_sysfs_prev) { |
1124fe6f | 958 | if (startswith(UNIT(other)->id, "sys-")) |
a7f241db LP |
959 | return UNIT(other); |
960 | ||
961 | first = other; | |
962 | } | |
963 | ||
964 | return UNIT(first); | |
965 | } | |
966 | ||
e9fa1bf7 MY |
967 | static int device_following_set(Unit *u, Set **ret) { |
968 | Device *d = ASSERT_PTR(DEVICE(u)); | |
af4fa99d | 969 | _cleanup_set_free_ Set *set = NULL; |
6210e7fc LP |
970 | int r; |
971 | ||
e9fa1bf7 | 972 | assert(ret); |
6210e7fc | 973 | |
f1421cc6 | 974 | if (LIST_JUST_US(same_sysfs, d)) { |
e9fa1bf7 | 975 | *ret = NULL; |
6210e7fc LP |
976 | return 0; |
977 | } | |
978 | ||
d5099efc | 979 | set = set_new(NULL); |
f1421cc6 | 980 | if (!set) |
6210e7fc LP |
981 | return -ENOMEM; |
982 | ||
bd335c96 | 983 | LIST_FOREACH(same_sysfs, other, d->same_sysfs_next) { |
f1421cc6 LP |
984 | r = set_put(set, other); |
985 | if (r < 0) | |
95f14a3e | 986 | return r; |
f1421cc6 | 987 | } |
6210e7fc | 988 | |
bd335c96 | 989 | LIST_FOREACH_BACKWARDS(same_sysfs, other, d->same_sysfs_prev) { |
f1421cc6 LP |
990 | r = set_put(set, other); |
991 | if (r < 0) | |
95f14a3e | 992 | return r; |
f1421cc6 | 993 | } |
6210e7fc | 994 | |
e9fa1bf7 | 995 | *ret = TAKE_PTR(set); |
6210e7fc | 996 | return 1; |
6210e7fc LP |
997 | } |
998 | ||
25ac040b LP |
999 | static void device_shutdown(Manager *m) { |
1000 | assert(m); | |
1001 | ||
d0955f00 | 1002 | m->device_monitor = sd_device_monitor_unref(m->device_monitor); |
525d3cc7 | 1003 | m->devices_by_sysfs = hashmap_free(m->devices_by_sysfs); |
25ac040b LP |
1004 | } |
1005 | ||
ba64af90 | 1006 | static void device_enumerate(Manager *m) { |
4366e598 | 1007 | _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL; |
718db961 | 1008 | int r; |
25ac040b LP |
1009 | |
1010 | assert(m); | |
1011 | ||
d0955f00 YW |
1012 | if (!m->device_monitor) { |
1013 | r = sd_device_monitor_new(&m->device_monitor); | |
1014 | if (r < 0) { | |
1015 | log_error_errno(r, "Failed to allocate device monitor: %m"); | |
a16e1123 LP |
1016 | goto fail; |
1017 | } | |
f94ea366 | 1018 | |
d0955f00 | 1019 | r = sd_device_monitor_filter_add_match_tag(m->device_monitor, "systemd"); |
ba64af90 LP |
1020 | if (r < 0) { |
1021 | log_error_errno(r, "Failed to add udev tag match: %m"); | |
e1ce2c27 | 1022 | goto fail; |
ba64af90 | 1023 | } |
e1ce2c27 | 1024 | |
deb2b734 | 1025 | r = sd_device_monitor_attach_event(m->device_monitor, m->event); |
ba64af90 | 1026 | if (r < 0) { |
d0955f00 | 1027 | log_error_errno(r, "Failed to attach event to device monitor: %m"); |
a16e1123 | 1028 | goto fail; |
ba64af90 | 1029 | } |
f94ea366 | 1030 | |
deb2b734 | 1031 | r = sd_device_monitor_start(m->device_monitor, device_dispatch_io, m); |
ba64af90 | 1032 | if (r < 0) { |
d0955f00 | 1033 | log_error_errno(r, "Failed to start device monitor: %m"); |
718db961 | 1034 | goto fail; |
ba64af90 | 1035 | } |
a16e1123 | 1036 | } |
f94ea366 | 1037 | |
4366e598 | 1038 | r = sd_device_enumerator_new(&e); |
ba64af90 | 1039 | if (r < 0) { |
9b674e25 | 1040 | log_error_errno(r, "Failed to allocate device enumerator: %m"); |
e1ce2c27 | 1041 | goto fail; |
ba64af90 | 1042 | } |
25ac040b | 1043 | |
4366e598 | 1044 | r = sd_device_enumerator_add_match_tag(e, "systemd"); |
ba64af90 | 1045 | if (r < 0) { |
4366e598 | 1046 | log_error_errno(r, "Failed to set tag for device enumeration: %m"); |
e1202047 | 1047 | goto fail; |
ba64af90 | 1048 | } |
e1202047 | 1049 | |
8437c059 | 1050 | FOREACH_DEVICE(e, dev) { |
4228306b YW |
1051 | _cleanup_set_free_ Set *ready_units = NULL, *not_ready_units = NULL; |
1052 | Device *d; | |
628c89cc | 1053 | |
405be62f YW |
1054 | if (device_is_processed(dev) <= 0) |
1055 | continue; | |
1056 | ||
4228306b | 1057 | if (device_setup_units(m, dev, &ready_units, ¬_ready_units) < 0) |
4366e598 | 1058 | continue; |
4a1a1caf | 1059 | |
4228306b YW |
1060 | SET_FOREACH(d, ready_units) |
1061 | device_update_found_one(d, DEVICE_FOUND_UDEV, DEVICE_FOUND_UDEV); | |
1062 | SET_FOREACH(d, not_ready_units) | |
1063 | device_update_found_one(d, DEVICE_NOT_FOUND, DEVICE_FOUND_UDEV); | |
628c89cc | 1064 | } |
25ac040b | 1065 | |
ba64af90 | 1066 | return; |
25ac040b LP |
1067 | |
1068 | fail: | |
25ac040b | 1069 | device_shutdown(m); |
5cb5a6ff LP |
1070 | } |
1071 | ||
9616f550 YW |
1072 | static void device_propagate_reload(Manager *m, Device *d) { |
1073 | int r; | |
1074 | ||
1075 | assert(m); | |
1076 | assert(d); | |
1077 | ||
1078 | if (d->state == DEVICE_DEAD) | |
1079 | return; | |
1080 | ||
1081 | r = manager_propagate_reload(m, UNIT(d), JOB_REPLACE, NULL); | |
1082 | if (r < 0) | |
1083 | log_unit_warning_errno(UNIT(d), r, "Failed to propagate reload, ignoring: %m"); | |
1084 | } | |
1085 | ||
c8ad151a | 1086 | static void device_remove_old_on_move(Manager *m, sd_device *dev) { |
42ebcebf | 1087 | _cleanup_free_ char *syspath_old = NULL; |
87bc687a YW |
1088 | const char *devpath_old; |
1089 | int r; | |
1090 | ||
42ebcebf YW |
1091 | assert(m); |
1092 | assert(dev); | |
1093 | ||
87bc687a | 1094 | r = sd_device_get_property_value(dev, "DEVPATH_OLD", &devpath_old); |
c8ad151a LP |
1095 | if (r < 0) |
1096 | return (void) log_device_debug_errno(dev, r, "Failed to get DEVPATH_OLD= property on 'move' uevent, ignoring: %m"); | |
87bc687a YW |
1097 | |
1098 | syspath_old = path_join("/sys", devpath_old); | |
1099 | if (!syspath_old) | |
c8ad151a | 1100 | return (void) log_oom(); |
87bc687a | 1101 | |
b1ba0ce8 | 1102 | device_update_found_by_sysfs(m, syspath_old, DEVICE_NOT_FOUND, DEVICE_FOUND_MASK); |
87bc687a YW |
1103 | } |
1104 | ||
d0955f00 | 1105 | static int device_dispatch_io(sd_device_monitor *monitor, sd_device *dev, void *userdata) { |
4228306b | 1106 | _cleanup_set_free_ Set *ready_units = NULL, *not_ready_units = NULL; |
1363eeca | 1107 | Manager *m = ASSERT_PTR(userdata); |
a1130022 | 1108 | sd_device_action_t action; |
a7395c86 | 1109 | const char *sysfs; |
4a1a1caf | 1110 | bool ready; |
4228306b | 1111 | Device *d; |
718db961 | 1112 | int r; |
f94ea366 | 1113 | |
d0955f00 | 1114 | assert(dev); |
f94ea366 | 1115 | |
6cc4da5e DDM |
1116 | log_device_uevent(dev, "Processing udev action"); |
1117 | ||
4366e598 YW |
1118 | r = sd_device_get_syspath(dev, &sysfs); |
1119 | if (r < 0) { | |
58b0a3e5 | 1120 | log_device_warning_errno(dev, r, "Failed to get device syspath, ignoring: %m"); |
628c89cc LP |
1121 | return 0; |
1122 | } | |
1123 | ||
a1130022 | 1124 | r = sd_device_get_action(dev, &action); |
4366e598 | 1125 | if (r < 0) { |
58b0a3e5 | 1126 | log_device_warning_errno(dev, r, "Failed to get udev action, ignoring: %m"); |
718db961 | 1127 | return 0; |
f94ea366 LP |
1128 | } |
1129 | ||
dc53421d LP |
1130 | log_device_debug(dev, "Got '%s' action on syspath '%s'.", device_action_to_string(action), sysfs); |
1131 | ||
a1130022 | 1132 | if (action == SD_DEVICE_MOVE) |
c8ad151a | 1133 | device_remove_old_on_move(m, dev); |
87bc687a | 1134 | |
e9336d6a YW |
1135 | /* When udevd failed to process the device, SYSTEMD_ALIAS or any other properties may contain invalid |
1136 | * values. Let's refuse to handle the uevent. */ | |
1137 | if (sd_device_get_property_value(dev, "UDEV_WORKER_FAILED", NULL) >= 0) { | |
1138 | int v; | |
1139 | ||
1140 | if (device_get_property_int(dev, "UDEV_WORKER_ERRNO", &v) >= 0) | |
1141 | log_device_warning_errno(dev, v, "systemd-udevd failed to process the device, ignoring: %m"); | |
1142 | else if (device_get_property_int(dev, "UDEV_WORKER_EXIT_STATUS", &v) >= 0) | |
1143 | log_device_warning(dev, "systemd-udevd failed to process the device with exit status %i, ignoring.", v); | |
1144 | else if (device_get_property_int(dev, "UDEV_WORKER_SIGNAL", &v) >= 0) { | |
1145 | const char *s; | |
1146 | (void) sd_device_get_property_value(dev, "UDEV_WORKER_SIGNAL_NAME", &s); | |
1147 | log_device_warning(dev, "systemd-udevd failed to process the device with signal %i(%s), ignoring.", v, strna(s)); | |
1148 | } else | |
1149 | log_device_warning(dev, "systemd-udevd failed to process the device with unknown result, ignoring."); | |
1150 | ||
1151 | return 0; | |
1152 | } | |
1153 | ||
ae6ad21e LP |
1154 | /* A change event can signal that a device is becoming ready, in particular if the device is using |
1155 | * the SYSTEMD_READY logic in udev so we need to reach the else block of the following if, even for | |
1156 | * change events */ | |
1cb89339 YW |
1157 | ready = device_is_ready(dev); |
1158 | ||
4228306b YW |
1159 | (void) device_setup_units(m, dev, &ready_units, ¬_ready_units); |
1160 | ||
a1130022 | 1161 | if (action == SD_DEVICE_REMOVE) { |
628c89cc | 1162 | r = swap_process_device_remove(m, dev); |
9670d583 | 1163 | if (r < 0) |
71f79b56 | 1164 | log_device_warning_errno(dev, r, "Failed to process swap device remove event, ignoring: %m"); |
4228306b YW |
1165 | } else if (ready) { |
1166 | r = swap_process_device_new(m, dev); | |
1167 | if (r < 0) | |
1168 | log_device_warning_errno(dev, r, "Failed to process swap device new event, ignoring: %m"); | |
4a1a1caf YW |
1169 | } |
1170 | ||
4228306b YW |
1171 | if (!IN_SET(action, SD_DEVICE_ADD, SD_DEVICE_REMOVE, SD_DEVICE_MOVE)) |
1172 | SET_FOREACH(d, ready_units) | |
1173 | device_propagate_reload(m, d); | |
4a1a1caf | 1174 | |
4228306b | 1175 | if (!set_isempty(ready_units)) |
f1421cc6 LP |
1176 | manager_dispatch_load_queue(m); |
1177 | ||
4a1a1caf YW |
1178 | if (action == SD_DEVICE_REMOVE) |
1179 | /* If we get notified that a device was removed by udev, then it's completely gone, hence | |
4228306b YW |
1180 | * unset all found bits. Note this affects all .device units still point to the removed |
1181 | * device. */ | |
ef9ca572 | 1182 | device_update_found_by_sysfs(m, sysfs, DEVICE_NOT_FOUND, DEVICE_FOUND_MASK); |
f94ea366 | 1183 | |
4228306b YW |
1184 | /* These devices are found and ready now, set the udev found bit. Note, this is also necessary to do |
1185 | * on remove uevent, as some devlinks may be updated and now point to other device nodes. */ | |
1186 | SET_FOREACH(d, ready_units) | |
1187 | device_update_found_one(d, DEVICE_FOUND_UDEV, DEVICE_FOUND_UDEV); | |
1188 | ||
1189 | /* These devices may be nominally around, but not ready for us. Hence unset the udev bit, but leave | |
1190 | * the rest around. This may be redundant for remove uevent, but should be harmless. */ | |
1191 | SET_FOREACH(d, not_ready_units) | |
1192 | device_update_found_one(d, DEVICE_NOT_FOUND, DEVICE_FOUND_UDEV); | |
4a1a1caf | 1193 | |
718db961 | 1194 | return 0; |
f94ea366 LP |
1195 | } |
1196 | ||
e9222bfc | 1197 | void device_found_node(Manager *m, const char *node, DeviceFound found, DeviceFound mask) { |
e5ca27b7 | 1198 | int r; |
628c89cc LP |
1199 | |
1200 | assert(m); | |
1201 | assert(node); | |
03a94b73 | 1202 | assert(!FLAGS_SET(mask, DEVICE_FOUND_UDEV)); |
628c89cc | 1203 | |
f374631a | 1204 | if (!udev_available()) |
485ae697 | 1205 | return; |
4c6d20de | 1206 | |
34c20ee0 LP |
1207 | if (mask == 0) |
1208 | return; | |
1209 | ||
1210 | /* This is called whenever we find a device referenced in /proc/swaps or /proc/self/mounts. Such a device might | |
1211 | * be mounted/enabled at a time where udev has not finished probing it yet, and we thus haven't learned about | |
66f3fdbb LP |
1212 | * it yet. In this case we will set the device unit to "tentative" state. |
1213 | * | |
1214 | * This takes a pair of DeviceFound flags parameters. The 'mask' parameter is a bit mask that indicates which | |
1215 | * bits of 'found' to copy into the per-device DeviceFound flags field. Thus, this function may be used to set | |
1216 | * and unset individual bits in a single call, while merging partially with previous state. */ | |
628c89cc | 1217 | |
485ae697 | 1218 | if ((found & mask) != 0) { |
4366e598 | 1219 | _cleanup_(sd_device_unrefp) sd_device *dev = NULL; |
628c89cc | 1220 | |
34c20ee0 LP |
1221 | /* If the device is known in the kernel and newly appeared, then we'll create a device unit for it, |
1222 | * under the name referenced in /proc/swaps or /proc/self/mountinfo. But first, let's validate if | |
e9222bfc DDM |
1223 | * everything is alright with the device node. Note that we're fine with missing device nodes, |
1224 | * but not with badly set up ones. */ | |
1225 | ||
1226 | r = sd_device_new_from_devname(&dev, node); | |
1227 | if (r == -ENODEV) | |
1228 | log_debug("Could not find device for %s, continuing without device node", node); | |
1229 | else if (r < 0) { | |
1230 | /* Reduce log noise from nodes which are not device nodes by skipping EINVAL. */ | |
1231 | if (r != -EINVAL) | |
1232 | log_error_errno(r, "Failed to open %s device, ignoring: %m", node); | |
1233 | return; | |
1234 | } | |
628c89cc | 1235 | |
4228306b | 1236 | (void) device_setup_unit(m, dev, node, /* main = */ false, NULL); /* 'dev' may be NULL. */ |
628c89cc LP |
1237 | } |
1238 | ||
1239 | /* Update the device unit's state, should it exist */ | |
485ae697 | 1240 | (void) device_update_found_by_name(m, node, found, mask); |
628c89cc LP |
1241 | } |
1242 | ||
ebc8968b | 1243 | bool device_shall_be_bound_by(Unit *device, Unit *u) { |
8bb2c8c9 LP |
1244 | assert(device); |
1245 | assert(u); | |
ebc8968b FB |
1246 | |
1247 | if (u->type != UNIT_MOUNT) | |
1248 | return false; | |
1249 | ||
1250 | return DEVICE(device)->bind_mounts; | |
1251 | } | |
1252 | ||
87f0e418 | 1253 | const UnitVTable device_vtable = { |
7d17cfbc | 1254 | .object_size = sizeof(Device), |
f975e971 LP |
1255 | .sections = |
1256 | "Unit\0" | |
1257 | "Device\0" | |
1258 | "Install\0", | |
5cb5a6ff | 1259 | |
c5a97ed1 LP |
1260 | .gc_jobs = true, |
1261 | ||
faf919f1 | 1262 | .init = device_init, |
034c6ed7 | 1263 | .done = device_done, |
1d4c6f5b | 1264 | .load = device_load, |
718db961 | 1265 | |
f50e0a01 | 1266 | .coldplug = device_coldplug, |
66f3fdbb | 1267 | .catchup = device_catchup, |
f50e0a01 | 1268 | |
f6200941 LP |
1269 | .serialize = device_serialize, |
1270 | .deserialize_item = device_deserialize_item, | |
1271 | ||
5cb5a6ff LP |
1272 | .dump = device_dump, |
1273 | ||
f50e0a01 | 1274 | .active_state = device_active_state, |
10a94420 | 1275 | .sub_state_to_string = device_sub_state_to_string, |
25ac040b | 1276 | |
a7f241db | 1277 | .following = device_following, |
6210e7fc | 1278 | .following_set = device_following_set, |
a7f241db | 1279 | |
f50e0a01 | 1280 | .enumerate = device_enumerate, |
c6918296 | 1281 | .shutdown = device_shutdown, |
f374631a | 1282 | .supported = udev_available, |
c6918296 MS |
1283 | |
1284 | .status_message_formats = { | |
1285 | .starting_stopping = { | |
1286 | [0] = "Expecting device %s...", | |
3f4a7a47 | 1287 | [1] = "Waiting for device %s to disappear...", |
c6918296 MS |
1288 | }, |
1289 | .finished_start_job = { | |
1290 | [JOB_DONE] = "Found device %s.", | |
1291 | [JOB_TIMEOUT] = "Timed out waiting for device %s.", | |
1292 | }, | |
1293 | }, | |
5cb5a6ff | 1294 | }; |