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Commit | Line | Data |
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db9ecf05 | 1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
07b0b134 ML |
2 | |
3 | #include <errno.h> | |
07b0b134 ML |
4 | #include <sys/epoll.h> |
5 | #include <sys/stat.h> | |
4f5dd394 | 6 | #include <unistd.h> |
07b0b134 | 7 | |
4366e598 | 8 | #include "sd-device.h" |
b4bbcaa9 | 9 | |
b5efdb8a | 10 | #include "alloc-util.h" |
07b0b134 | 11 | #include "dbus-swap.h" |
6fcbec6f | 12 | #include "dbus-unit.h" |
4366e598 | 13 | #include "device-util.h" |
57b7a260 | 14 | #include "device.h" |
4f5dd394 | 15 | #include "escape.h" |
9a57c629 | 16 | #include "exit-status.h" |
3ffd4af2 | 17 | #include "fd-util.h" |
f97b34a6 | 18 | #include "format-util.h" |
4f5dd394 | 19 | #include "fstab-util.h" |
6bedfcbb | 20 | #include "parse-util.h" |
9eb977db | 21 | #include "path-util.h" |
7b3e062c | 22 | #include "process-util.h" |
d68c645b | 23 | #include "serialize.h" |
4f5dd394 | 24 | #include "special.h" |
8b43440b | 25 | #include "string-table.h" |
07630cea | 26 | #include "string-util.h" |
3ffd4af2 | 27 | #include "swap.h" |
4f5dd394 LP |
28 | #include "unit-name.h" |
29 | #include "unit.h" | |
30 | #include "virt.h" | |
07b0b134 ML |
31 | |
32 | static const UnitActiveState state_translation_table[_SWAP_STATE_MAX] = { | |
33 | [SWAP_DEAD] = UNIT_INACTIVE, | |
e04aad61 | 34 | [SWAP_ACTIVATING] = UNIT_ACTIVATING, |
5bcb0f2b | 35 | [SWAP_ACTIVATING_DONE] = UNIT_ACTIVE, |
07b0b134 | 36 | [SWAP_ACTIVE] = UNIT_ACTIVE, |
e04aad61 | 37 | [SWAP_DEACTIVATING] = UNIT_DEACTIVATING, |
e04aad61 LP |
38 | [SWAP_DEACTIVATING_SIGTERM] = UNIT_DEACTIVATING, |
39 | [SWAP_DEACTIVATING_SIGKILL] = UNIT_DEACTIVATING, | |
a8b689b7 YW |
40 | [SWAP_FAILED] = UNIT_FAILED, |
41 | [SWAP_CLEANING] = UNIT_MAINTENANCE, | |
07b0b134 ML |
42 | }; |
43 | ||
718db961 LP |
44 | static int swap_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata); |
45 | static int swap_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata); | |
bcce581d | 46 | static int swap_process_proc_swaps(Manager *m); |
718db961 | 47 | |
dedf3719 LP |
48 | static bool SWAP_STATE_WITH_PROCESS(SwapState state) { |
49 | return IN_SET(state, | |
50 | SWAP_ACTIVATING, | |
51 | SWAP_ACTIVATING_DONE, | |
52 | SWAP_DEACTIVATING, | |
53 | SWAP_DEACTIVATING_SIGTERM, | |
a8b689b7 YW |
54 | SWAP_DEACTIVATING_SIGKILL, |
55 | SWAP_CLEANING); | |
dedf3719 LP |
56 | } |
57 | ||
d1e8e8b5 | 58 | static UnitActiveState swap_active_state(Unit *u) { |
39c79477 ZJS |
59 | assert(u); |
60 | ||
61 | return state_translation_table[SWAP(u)->state]; | |
62 | } | |
63 | ||
d1e8e8b5 | 64 | static const char *swap_sub_state_to_string(Unit *u) { |
39c79477 ZJS |
65 | assert(u); |
66 | ||
67 | return swap_state_to_string(SWAP(u)->state); | |
68 | } | |
69 | ||
d1e8e8b5 | 70 | static bool swap_may_gc(Unit *u) { |
39c79477 ZJS |
71 | Swap *s = SWAP(u); |
72 | ||
73 | assert(s); | |
74 | ||
75 | if (s->from_proc_swaps) | |
76 | return false; | |
77 | ||
78 | return true; | |
79 | } | |
80 | ||
d1e8e8b5 | 81 | static bool swap_is_extrinsic(Unit *u) { |
39c79477 ZJS |
82 | assert(SWAP(u)); |
83 | ||
84 | return MANAGER_IS_USER(u->manager); | |
85 | } | |
86 | ||
e04aad61 | 87 | static void swap_unset_proc_swaps(Swap *s) { |
9670d583 LP |
88 | assert(s); |
89 | ||
90 | if (!s->from_proc_swaps) | |
91 | return; | |
92 | ||
a1e58e8e | 93 | s->parameters_proc_swaps.what = mfree(s->parameters_proc_swaps.what); |
9670d583 LP |
94 | s->from_proc_swaps = false; |
95 | } | |
96 | ||
97 | static int swap_set_devnode(Swap *s, const char *devnode) { | |
df326b84 | 98 | Hashmap *swaps; |
5bcb0f2b | 99 | Swap *first; |
9670d583 | 100 | int r; |
e04aad61 LP |
101 | |
102 | assert(s); | |
103 | ||
548f6937 | 104 | r = hashmap_ensure_allocated(&UNIT(s)->manager->swaps_by_devnode, &path_hash_ops); |
9670d583 LP |
105 | if (r < 0) |
106 | return r; | |
e04aad61 | 107 | |
9670d583 | 108 | swaps = UNIT(s)->manager->swaps_by_devnode; |
e04aad61 | 109 | |
9670d583 LP |
110 | if (s->devnode) { |
111 | first = hashmap_get(swaps, s->devnode); | |
e04aad61 | 112 | |
9670d583 LP |
113 | LIST_REMOVE(same_devnode, first, s); |
114 | if (first) | |
115 | hashmap_replace(swaps, first->devnode, first); | |
116 | else | |
117 | hashmap_remove(swaps, s->devnode); | |
5bcb0f2b | 118 | |
a1e58e8e | 119 | s->devnode = mfree(s->devnode); |
9670d583 LP |
120 | } |
121 | ||
122 | if (devnode) { | |
123 | s->devnode = strdup(devnode); | |
124 | if (!s->devnode) | |
125 | return -ENOMEM; | |
126 | ||
127 | first = hashmap_get(swaps, s->devnode); | |
128 | LIST_PREPEND(same_devnode, first, s); | |
129 | ||
130 | return hashmap_replace(swaps, first->devnode, first); | |
131 | } | |
132 | ||
133 | return 0; | |
e04aad61 LP |
134 | } |
135 | ||
f6cebb3b | 136 | static void swap_init(Unit *u) { |
6e620bec LP |
137 | Swap *s = SWAP(u); |
138 | ||
139 | assert(s); | |
1124fe6f | 140 | assert(UNIT(s)->load_state == UNIT_STUB); |
6e620bec | 141 | |
1f19a534 | 142 | s->timeout_usec = u->manager->default_timeout_start_usec; |
e04aad61 | 143 | |
ac155bb8 MS |
144 | s->exec_context.std_output = u->manager->default_std_output; |
145 | s->exec_context.std_error = u->manager->default_std_error; | |
085afe36 | 146 | |
e1770af8 | 147 | s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; |
c8f4d764 | 148 | |
5bcb0f2b | 149 | u->ignore_on_isolate = true; |
e04aad61 LP |
150 | } |
151 | ||
152 | static void swap_unwatch_control_pid(Swap *s) { | |
153 | assert(s); | |
154 | ||
155 | if (s->control_pid <= 0) | |
156 | return; | |
157 | ||
8f03de53 | 158 | unit_unwatch_pid(UNIT(s), TAKE_PID(s->control_pid)); |
6e620bec LP |
159 | } |
160 | ||
4e85aff4 LP |
161 | static void swap_done(Unit *u) { |
162 | Swap *s = SWAP(u); | |
07b0b134 | 163 | |
4e85aff4 | 164 | assert(s); |
07b0b134 | 165 | |
e04aad61 | 166 | swap_unset_proc_swaps(s); |
9670d583 | 167 | swap_set_devnode(s, NULL); |
e04aad61 | 168 | |
a1e58e8e LP |
169 | s->what = mfree(s->what); |
170 | s->parameters_fragment.what = mfree(s->parameters_fragment.what); | |
171 | s->parameters_fragment.options = mfree(s->parameters_fragment.options); | |
86b23b07 | 172 | |
28135da3 | 173 | s->exec_runtime = exec_runtime_free(s->exec_runtime); |
e04aad61 LP |
174 | exec_command_done_array(s->exec_command, _SWAP_EXEC_COMMAND_MAX); |
175 | s->control_command = NULL; | |
176 | ||
177 | swap_unwatch_control_pid(s); | |
178 | ||
5dcadb4c | 179 | s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source); |
718db961 LP |
180 | } |
181 | ||
36c16a7c | 182 | static int swap_arm_timer(Swap *s, usec_t usec) { |
718db961 LP |
183 | int r; |
184 | ||
185 | assert(s); | |
186 | ||
718db961 | 187 | if (s->timer_event_source) { |
36c16a7c | 188 | r = sd_event_source_set_time(s->timer_event_source, usec); |
718db961 LP |
189 | if (r < 0) |
190 | return r; | |
191 | ||
192 | return sd_event_source_set_enabled(s->timer_event_source, SD_EVENT_ONESHOT); | |
193 | } | |
194 | ||
36c16a7c LP |
195 | if (usec == USEC_INFINITY) |
196 | return 0; | |
197 | ||
7dfbe2e3 | 198 | r = sd_event_add_time( |
6a0f1f6d LP |
199 | UNIT(s)->manager->event, |
200 | &s->timer_event_source, | |
201 | CLOCK_MONOTONIC, | |
36c16a7c | 202 | usec, 0, |
6a0f1f6d | 203 | swap_dispatch_timer, s); |
7dfbe2e3 TG |
204 | if (r < 0) |
205 | return r; | |
206 | ||
207 | (void) sd_event_source_set_description(s->timer_event_source, "swap-timer"); | |
208 | ||
209 | return 0; | |
07b0b134 ML |
210 | } |
211 | ||
61f9cf4e LP |
212 | static SwapParameters* swap_get_parameters(Swap *s) { |
213 | assert(s); | |
214 | ||
215 | if (s->from_proc_swaps) | |
216 | return &s->parameters_proc_swaps; | |
217 | ||
218 | if (s->from_fragment) | |
219 | return &s->parameters_fragment; | |
220 | ||
221 | return NULL; | |
222 | } | |
223 | ||
eef85c4a | 224 | static int swap_add_device_dependencies(Swap *s) { |
61f9cf4e LP |
225 | UnitDependencyMask mask; |
226 | SwapParameters *p; | |
44b0d1fd | 227 | int r; |
61f9cf4e | 228 | |
173a8d04 LP |
229 | assert(s); |
230 | ||
231 | if (!s->what) | |
232 | return 0; | |
233 | ||
61f9cf4e | 234 | p = swap_get_parameters(s); |
d4a3494e | 235 | if (!p || !p->what) |
f10af76d LP |
236 | return 0; |
237 | ||
61f9cf4e LP |
238 | mask = s->from_proc_swaps ? UNIT_DEPENDENCY_PROC_SWAP : UNIT_DEPENDENCY_FILE; |
239 | ||
44b0d1fd LP |
240 | if (is_device_path(p->what)) { |
241 | r = unit_add_node_dependency(UNIT(s), p->what, UNIT_REQUIRES, mask); | |
242 | if (r < 0) | |
243 | return r; | |
244 | ||
245 | return unit_add_blockdev_dependency(UNIT(s), p->what, mask); | |
246 | } | |
9b88bb50 | 247 | |
61f9cf4e LP |
248 | /* File based swap devices need to be ordered after systemd-remount-fs.service, since they might need |
249 | * a writable file system. */ | |
250 | return unit_add_dependency_by_name(UNIT(s), UNIT_AFTER, SPECIAL_REMOUNT_FS_SERVICE, true, mask); | |
173a8d04 LP |
251 | } |
252 | ||
2edd4434 | 253 | static int swap_add_default_dependencies(Swap *s) { |
8bf23dc7 FB |
254 | int r; |
255 | ||
2edd4434 LP |
256 | assert(s); |
257 | ||
4c9ea260 LP |
258 | if (!UNIT(s)->default_dependencies) |
259 | return 0; | |
260 | ||
463d0d15 | 261 | if (!MANAGER_IS_SYSTEM(UNIT(s)->manager)) |
6b1dc2bd | 262 | return 0; |
2edd4434 | 263 | |
75f86906 | 264 | if (detect_container() > 0) |
c0387ebf LP |
265 | return 0; |
266 | ||
8bf23dc7 FB |
267 | /* swap units generated for the swap dev links are missing the |
268 | * ordering dep against the swap target. */ | |
35d8c19a | 269 | r = unit_add_dependency_by_name(UNIT(s), UNIT_BEFORE, SPECIAL_SWAP_TARGET, true, UNIT_DEPENDENCY_DEFAULT); |
8bf23dc7 FB |
270 | if (r < 0) |
271 | return r; | |
272 | ||
84214541 | 273 | return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, true, UNIT_DEPENDENCY_DEFAULT); |
2edd4434 LP |
274 | } |
275 | ||
4e85aff4 | 276 | static int swap_verify(Swap *s) { |
7fd1b19b | 277 | _cleanup_free_ char *e = NULL; |
7410616c | 278 | int r; |
4e85aff4 | 279 | |
75193d41 | 280 | assert(UNIT(s)->load_state == UNIT_LOADED); |
4e85aff4 | 281 | |
7410616c LP |
282 | r = unit_name_from_path(s->what, ".swap", &e); |
283 | if (r < 0) | |
f2341e0a | 284 | return log_unit_error_errno(UNIT(s), r, "Failed to generate unit name from path: %m"); |
4e85aff4 | 285 | |
d85ff944 YW |
286 | if (!unit_has_name(UNIT(s), e)) |
287 | return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Value of What= and unit name do not match, not loading."); | |
4e85aff4 | 288 | |
d85ff944 YW |
289 | if (s->exec_context.pam_name && s->kill_context.kill_mode != KILL_CONTROL_GROUP) |
290 | return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Unit has PAM enabled. Kill mode must be set to 'control-group'. Refusing to load."); | |
e04aad61 | 291 | |
4e85aff4 LP |
292 | return 0; |
293 | } | |
294 | ||
9670d583 | 295 | static int swap_load_devnode(Swap *s) { |
ca822829 | 296 | _cleanup_free_ char *p = NULL; |
9670d583 | 297 | struct stat st; |
e5ca27b7 | 298 | int r; |
9670d583 LP |
299 | |
300 | assert(s); | |
301 | ||
302 | if (stat(s->what, &st) < 0 || !S_ISBLK(st.st_mode)) | |
303 | return 0; | |
304 | ||
b8a3f619 | 305 | r = devname_from_stat_rdev(&st, &p); |
e5ca27b7 | 306 | if (r < 0) { |
8ed6f81b | 307 | log_unit_full_errno(UNIT(s), r == -ENOENT ? LOG_DEBUG : LOG_WARNING, r, |
ca822829 | 308 | "Failed to get device node for swap %s: %m", s->what); |
9670d583 | 309 | return 0; |
e5ca27b7 | 310 | } |
9670d583 | 311 | |
9670d583 LP |
312 | return swap_set_devnode(s, p); |
313 | } | |
314 | ||
15332d73 | 315 | static int swap_add_extras(Swap *s) { |
07b0b134 | 316 | int r; |
07b0b134 ML |
317 | |
318 | assert(s); | |
07b0b134 | 319 | |
15332d73 LP |
320 | if (UNIT(s)->fragment_path) |
321 | s->from_fragment = true; | |
07b0b134 | 322 | |
15332d73 LP |
323 | if (!s->what) { |
324 | if (s->parameters_fragment.what) | |
325 | s->what = strdup(s->parameters_fragment.what); | |
326 | else if (s->parameters_proc_swaps.what) | |
327 | s->what = strdup(s->parameters_proc_swaps.what); | |
328 | else { | |
329 | r = unit_name_to_path(UNIT(s)->id, &s->what); | |
5bcb0f2b | 330 | if (r < 0) |
4e85aff4 | 331 | return r; |
5bcb0f2b | 332 | } |
4e85aff4 | 333 | |
15332d73 LP |
334 | if (!s->what) |
335 | return -ENOMEM; | |
336 | } | |
07b0b134 | 337 | |
4ff361cc | 338 | path_simplify(s->what); |
07b0b134 | 339 | |
15332d73 LP |
340 | if (!UNIT(s)->description) { |
341 | r = unit_set_description(UNIT(s), s->what); | |
9670d583 LP |
342 | if (r < 0) |
343 | return r; | |
15332d73 | 344 | } |
9670d583 | 345 | |
15332d73 LP |
346 | r = unit_require_mounts_for(UNIT(s), s->what, UNIT_DEPENDENCY_IMPLICIT); |
347 | if (r < 0) | |
348 | return r; | |
598459ce | 349 | |
15332d73 LP |
350 | r = swap_add_device_dependencies(s); |
351 | if (r < 0) | |
352 | return r; | |
598459ce | 353 | |
15332d73 LP |
354 | r = swap_load_devnode(s); |
355 | if (r < 0) | |
356 | return r; | |
a016b922 | 357 | |
15332d73 LP |
358 | r = unit_patch_contexts(UNIT(s)); |
359 | if (r < 0) | |
360 | return r; | |
361 | ||
362 | r = unit_add_exec_dependencies(UNIT(s), &s->exec_context); | |
363 | if (r < 0) | |
364 | return r; | |
365 | ||
366 | r = unit_set_default_slice(UNIT(s)); | |
367 | if (r < 0) | |
368 | return r; | |
369 | ||
370 | r = swap_add_default_dependencies(s); | |
371 | if (r < 0) | |
372 | return r; | |
373 | ||
374 | return 0; | |
375 | } | |
376 | ||
377 | static int swap_load(Unit *u) { | |
378 | Swap *s = SWAP(u); | |
75193d41 | 379 | int r, q = 0; |
15332d73 LP |
380 | |
381 | assert(s); | |
382 | assert(u->load_state == UNIT_STUB); | |
383 | ||
384 | /* Load a .swap file */ | |
c3620770 ZJS |
385 | bool fragment_optional = s->from_proc_swaps; |
386 | r = unit_load_fragment_and_dropin(u, !fragment_optional); | |
15332d73 | 387 | |
75193d41 ZJS |
388 | /* Add in some extras, and do so either when we successfully loaded something or when /proc/swaps is |
389 | * already active. */ | |
06721f39 LP |
390 | if (u->load_state == UNIT_LOADED || s->from_proc_swaps) |
391 | q = swap_add_extras(s); | |
15332d73 | 392 | |
06721f39 LP |
393 | if (r < 0) |
394 | return r; | |
395 | if (q < 0) | |
396 | return q; | |
75193d41 ZJS |
397 | if (u->load_state != UNIT_LOADED) |
398 | return 0; | |
07b0b134 ML |
399 | |
400 | return swap_verify(s); | |
401 | } | |
402 | ||
628c89cc | 403 | static int swap_setup_unit( |
4e85aff4 LP |
404 | Manager *m, |
405 | const char *what, | |
e04aad61 | 406 | const char *what_proc_swaps, |
4e85aff4 | 407 | int priority, |
e04aad61 LP |
408 | bool set_flags) { |
409 | ||
7fd1b19b | 410 | _cleanup_free_ char *e = NULL; |
2c7c6144 | 411 | bool delete = false; |
5bcb0f2b | 412 | Unit *u = NULL; |
07b0b134 | 413 | int r; |
4e85aff4 LP |
414 | SwapParameters *p; |
415 | ||
416 | assert(m); | |
417 | assert(what); | |
6b1dc2bd | 418 | assert(what_proc_swaps); |
07b0b134 | 419 | |
7410616c LP |
420 | r = unit_name_from_path(what, ".swap", &e); |
421 | if (r < 0) | |
f2341e0a | 422 | return log_unit_error_errno(u, r, "Failed to generate unit name from path: %m"); |
07b0b134 | 423 | |
e04aad61 | 424 | u = manager_get_unit(m, e); |
6b1dc2bd | 425 | if (u && |
e04aad61 | 426 | SWAP(u)->from_proc_swaps && |
baaa35ad ZJS |
427 | !path_equal(SWAP(u)->parameters_proc_swaps.what, what_proc_swaps)) |
428 | return log_error_errno(SYNTHETIC_ERRNO(EEXIST), | |
429 | "Swap %s appeared twice with different device paths %s and %s", | |
430 | e, SWAP(u)->parameters_proc_swaps.what, what_proc_swaps); | |
4e85aff4 LP |
431 | |
432 | if (!u) { | |
07b0b134 ML |
433 | delete = true; |
434 | ||
a581e45a | 435 | r = unit_new_for_name(m, sizeof(Swap), e, &u); |
7d17cfbc | 436 | if (r < 0) |
e04aad61 LP |
437 | goto fail; |
438 | ||
7d17cfbc MS |
439 | SWAP(u)->what = strdup(what); |
440 | if (!SWAP(u)->what) { | |
628c89cc | 441 | r = -ENOMEM; |
e04aad61 LP |
442 | goto fail; |
443 | } | |
444 | ||
445 | unit_add_to_load_queue(u); | |
4e85aff4 LP |
446 | } else |
447 | delete = false; | |
07b0b134 | 448 | |
6b1dc2bd | 449 | p = &SWAP(u)->parameters_proc_swaps; |
07b0b134 | 450 | |
6b1dc2bd | 451 | if (!p->what) { |
5bcb0f2b LP |
452 | p->what = strdup(what_proc_swaps); |
453 | if (!p->what) { | |
454 | r = -ENOMEM; | |
6b1dc2bd LP |
455 | goto fail; |
456 | } | |
6b1dc2bd | 457 | } |
e04aad61 | 458 | |
46f94480 LP |
459 | /* The unit is definitely around now, mark it as loaded if it was previously referenced but could not be |
460 | * loaded. After all we can load it now, from the data in /proc/swaps. */ | |
461 | if (IN_SET(u->load_state, UNIT_NOT_FOUND, UNIT_BAD_SETTING, UNIT_ERROR)) { | |
462 | u->load_state = UNIT_LOADED; | |
463 | u->load_error = 0; | |
464 | } | |
465 | ||
6b1dc2bd LP |
466 | if (set_flags) { |
467 | SWAP(u)->is_active = true; | |
468 | SWAP(u)->just_activated = !SWAP(u)->from_proc_swaps; | |
4e85aff4 | 469 | } |
07b0b134 | 470 | |
6b1dc2bd LP |
471 | SWAP(u)->from_proc_swaps = true; |
472 | ||
4e85aff4 | 473 | p->priority = priority; |
7477451b | 474 | p->priority_set = true; |
07b0b134 | 475 | |
4e85aff4 | 476 | unit_add_to_dbus_queue(u); |
07b0b134 ML |
477 | return 0; |
478 | ||
479 | fail: | |
f2341e0a | 480 | log_unit_warning_errno(u, r, "Failed to load swap unit: %m"); |
e04aad61 | 481 | |
c9d5c9c0 | 482 | if (delete) |
07b0b134 ML |
483 | unit_free(u); |
484 | ||
4e85aff4 | 485 | return r; |
07b0b134 ML |
486 | } |
487 | ||
6aeb8c89 | 488 | static void swap_process_new(Manager *m, const char *device, int prio, bool set_flags) { |
4366e598 | 489 | _cleanup_(sd_device_unrefp) sd_device *d = NULL; |
a1af8372 | 490 | const char *dn; |
4366e598 | 491 | struct stat st, st_link; |
5bcb0f2b | 492 | int r; |
e04aad61 LP |
493 | |
494 | assert(m); | |
495 | ||
6aeb8c89 LP |
496 | if (swap_setup_unit(m, device, device, prio, set_flags) < 0) |
497 | return; | |
e04aad61 | 498 | |
5bcb0f2b LP |
499 | /* If this is a block device, then let's add duplicates for |
500 | * all other names of this block device */ | |
501 | if (stat(device, &st) < 0 || !S_ISBLK(st.st_mode)) | |
6aeb8c89 | 502 | return; |
e04aad61 | 503 | |
a1130022 | 504 | r = sd_device_new_from_stat_rdev(&d, &st); |
6aeb8c89 LP |
505 | if (r < 0) |
506 | return (void) log_full_errno(r == -ENOENT ? LOG_DEBUG : LOG_WARNING, r, | |
507 | "Failed to allocate device for swap %s: %m", device); | |
e04aad61 | 508 | |
5bcb0f2b | 509 | /* Add the main device node */ |
4366e598 | 510 | if (sd_device_get_devname(d, &dn) >= 0 && !streq(dn, device)) |
6aeb8c89 | 511 | (void) swap_setup_unit(m, dn, device, prio, set_flags); |
e04aad61 | 512 | |
5bcb0f2b | 513 | /* Add additional units for all symlinks */ |
4366e598 | 514 | FOREACH_DEVICE_DEVLINK(d, devlink) { |
e04aad61 | 515 | |
5bcb0f2b | 516 | /* Don't bother with the /dev/block links */ |
4366e598 | 517 | if (streq(devlink, device)) |
5bcb0f2b | 518 | continue; |
e04aad61 | 519 | |
4366e598 | 520 | if (path_startswith(devlink, "/dev/block/")) |
5bcb0f2b | 521 | continue; |
e04aad61 | 522 | |
4366e598 YW |
523 | if (stat(devlink, &st_link) >= 0 && |
524 | (!S_ISBLK(st_link.st_mode) || | |
525 | st_link.st_rdev != st.st_rdev)) | |
526 | continue; | |
e04aad61 | 527 | |
6aeb8c89 | 528 | (void) swap_setup_unit(m, devlink, device, prio, set_flags); |
e04aad61 | 529 | } |
e04aad61 LP |
530 | } |
531 | ||
07b0b134 ML |
532 | static void swap_set_state(Swap *s, SwapState state) { |
533 | SwapState old_state; | |
e04aad61 | 534 | |
07b0b134 ML |
535 | assert(s); |
536 | ||
6fcbec6f LP |
537 | if (s->state != state) |
538 | bus_unit_send_pending_change_signal(UNIT(s), false); | |
539 | ||
07b0b134 ML |
540 | old_state = s->state; |
541 | s->state = state; | |
542 | ||
dedf3719 | 543 | if (!SWAP_STATE_WITH_PROCESS(state)) { |
5dcadb4c | 544 | s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source); |
e04aad61 LP |
545 | swap_unwatch_control_pid(s); |
546 | s->control_command = NULL; | |
547 | s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; | |
548 | } | |
549 | ||
07b0b134 | 550 | if (state != old_state) |
f2341e0a | 551 | log_unit_debug(UNIT(s), "Changed %s -> %s", swap_state_to_string(old_state), swap_state_to_string(state)); |
07b0b134 | 552 | |
96b09de5 | 553 | unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], /* reload_success = */ true); |
37cf8fee LP |
554 | |
555 | /* If there other units for the same device node have a job | |
556 | queued it might be worth checking again if it is runnable | |
557 | now. This is necessary, since swap_start() refuses | |
558 | operation with EAGAIN if there's already another job for | |
559 | the same device node queued. */ | |
560 | LIST_FOREACH_OTHERS(same_devnode, other, s) | |
561 | if (UNIT(other)->job) | |
562 | job_add_to_run_queue(UNIT(other)->job); | |
07b0b134 ML |
563 | } |
564 | ||
be847e82 | 565 | static int swap_coldplug(Unit *u) { |
07b0b134 ML |
566 | Swap *s = SWAP(u); |
567 | SwapState new_state = SWAP_DEAD; | |
e04aad61 | 568 | int r; |
07b0b134 ML |
569 | |
570 | assert(s); | |
571 | assert(s->state == SWAP_DEAD); | |
572 | ||
573 | if (s->deserialized_state != s->state) | |
574 | new_state = s->deserialized_state; | |
4e85aff4 | 575 | else if (s->from_proc_swaps) |
07b0b134 ML |
576 | new_state = SWAP_ACTIVE; |
577 | ||
5bcb0f2b LP |
578 | if (new_state == s->state) |
579 | return 0; | |
e04aad61 | 580 | |
c386f588 LP |
581 | if (s->control_pid > 0 && |
582 | pid_is_unwaited(s->control_pid) && | |
dedf3719 | 583 | SWAP_STATE_WITH_PROCESS(new_state)) { |
e04aad61 | 584 | |
f75f613d | 585 | r = unit_watch_pid(UNIT(s), s->control_pid, false); |
5bcb0f2b LP |
586 | if (r < 0) |
587 | return r; | |
e04aad61 | 588 | |
36c16a7c | 589 | r = swap_arm_timer(s, usec_add(u->state_change_timestamp.monotonic, s->timeout_usec)); |
5bcb0f2b LP |
590 | if (r < 0) |
591 | return r; | |
e04aad61 | 592 | } |
07b0b134 | 593 | |
15220772 | 594 | if (!IN_SET(new_state, SWAP_DEAD, SWAP_FAILED)) |
e8a565cb | 595 | (void) unit_setup_exec_runtime(u); |
29206d46 | 596 | |
5bcb0f2b | 597 | swap_set_state(s, new_state); |
07b0b134 ML |
598 | return 0; |
599 | } | |
600 | ||
601 | static void swap_dump(Unit *u, FILE *f, const char *prefix) { | |
602 | Swap *s = SWAP(u); | |
4e85aff4 | 603 | SwapParameters *p; |
07b0b134 ML |
604 | |
605 | assert(s); | |
4e85aff4 LP |
606 | assert(f); |
607 | ||
608 | if (s->from_proc_swaps) | |
609 | p = &s->parameters_proc_swaps; | |
610 | else if (s->from_fragment) | |
611 | p = &s->parameters_fragment; | |
b6bfc7bb LP |
612 | else |
613 | p = NULL; | |
07b0b134 ML |
614 | |
615 | fprintf(f, | |
4e85aff4 | 616 | "%sSwap State: %s\n" |
e1770af8 | 617 | "%sResult: %s\n" |
a8b689b7 | 618 | "%sClean Result: %s\n" |
07b0b134 | 619 | "%sWhat: %s\n" |
4e85aff4 | 620 | "%sFrom /proc/swaps: %s\n" |
39c79477 ZJS |
621 | "%sFrom fragment: %s\n" |
622 | "%sExtrinsic: %s\n", | |
07b0b134 | 623 | prefix, swap_state_to_string(s->state), |
e1770af8 | 624 | prefix, swap_result_to_string(s->result), |
a8b689b7 | 625 | prefix, swap_result_to_string(s->clean_result), |
07b0b134 | 626 | prefix, s->what, |
4e85aff4 | 627 | prefix, yes_no(s->from_proc_swaps), |
39c79477 ZJS |
628 | prefix, yes_no(s->from_fragment), |
629 | prefix, yes_no(swap_is_extrinsic(u))); | |
e04aad61 | 630 | |
9670d583 LP |
631 | if (s->devnode) |
632 | fprintf(f, "%sDevice Node: %s\n", prefix, s->devnode); | |
633 | ||
b6bfc7bb LP |
634 | if (p) |
635 | fprintf(f, | |
636 | "%sPriority: %i\n" | |
47cb901e | 637 | "%sOptions: %s\n", |
b6bfc7bb | 638 | prefix, p->priority, |
47cb901e | 639 | prefix, strempty(p->options)); |
b6bfc7bb | 640 | |
9bd0e1b8 YW |
641 | fprintf(f, |
642 | "%sTimeoutSec: %s\n", | |
5291f26d | 643 | prefix, FORMAT_TIMESPAN(s->timeout_usec, USEC_PER_SEC)); |
9bd0e1b8 | 644 | |
e04aad61 LP |
645 | if (s->control_pid > 0) |
646 | fprintf(f, | |
de0671ee ZJS |
647 | "%sControl PID: "PID_FMT"\n", |
648 | prefix, s->control_pid); | |
e04aad61 LP |
649 | |
650 | exec_context_dump(&s->exec_context, f, prefix); | |
4819ff03 | 651 | kill_context_dump(&s->kill_context, f, prefix); |
bc0623df | 652 | cgroup_context_dump(UNIT(s), f, prefix); |
e04aad61 LP |
653 | } |
654 | ||
655 | static int swap_spawn(Swap *s, ExecCommand *c, pid_t *_pid) { | |
3c7416b6 | 656 | |
b9c04eaf | 657 | _cleanup_(exec_params_clear) ExecParameters exec_params = { |
1703fa41 | 658 | .flags = EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN, |
254d1313 ZJS |
659 | .stdin_fd = -EBADF, |
660 | .stdout_fd = -EBADF, | |
661 | .stderr_fd = -EBADF, | |
662 | .exec_fd = -EBADF, | |
9fa95f85 | 663 | }; |
3c7416b6 LP |
664 | pid_t pid; |
665 | int r; | |
e04aad61 LP |
666 | |
667 | assert(s); | |
668 | assert(c); | |
669 | assert(_pid); | |
670 | ||
3c7416b6 | 671 | r = unit_prepare_exec(UNIT(s)); |
29206d46 | 672 | if (r < 0) |
3c7416b6 | 673 | return r; |
29206d46 | 674 | |
36c16a7c | 675 | r = swap_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec)); |
646134dc | 676 | if (r < 0) |
e04aad61 LP |
677 | goto fail; |
678 | ||
1ad6e8b3 LP |
679 | r = unit_set_exec_params(UNIT(s), &exec_params); |
680 | if (r < 0) | |
681 | goto fail; | |
9fa95f85 | 682 | |
f2341e0a LP |
683 | r = exec_spawn(UNIT(s), |
684 | c, | |
646134dc | 685 | &s->exec_context, |
9fa95f85 | 686 | &exec_params, |
613b411c | 687 | s->exec_runtime, |
6bb00842 | 688 | &s->cgroup_context, |
646134dc ZJS |
689 | &pid); |
690 | if (r < 0) | |
e04aad61 LP |
691 | goto fail; |
692 | ||
f75f613d | 693 | r = unit_watch_pid(UNIT(s), pid, true); |
646134dc | 694 | if (r < 0) |
e04aad61 LP |
695 | goto fail; |
696 | ||
697 | *_pid = pid; | |
698 | ||
699 | return 0; | |
700 | ||
701 | fail: | |
5dcadb4c | 702 | s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source); |
3536f49e | 703 | |
e04aad61 | 704 | return r; |
07b0b134 ML |
705 | } |
706 | ||
e1770af8 | 707 | static void swap_enter_dead(Swap *s, SwapResult f) { |
07b0b134 ML |
708 | assert(s); |
709 | ||
a0fef983 | 710 | if (s->result == SWAP_SUCCESS) |
e1770af8 | 711 | s->result = f; |
e04aad61 | 712 | |
aac99f30 | 713 | unit_log_result(UNIT(s), s->result == SWAP_SUCCESS, swap_result_to_string(s->result)); |
4c425434 | 714 | unit_warn_leftover_processes(UNIT(s), unit_log_leftover_process_stop); |
29206d46 LP |
715 | swap_set_state(s, s->result != SWAP_SUCCESS ? SWAP_FAILED : SWAP_DEAD); |
716 | ||
28135da3 | 717 | s->exec_runtime = exec_runtime_destroy(s->exec_runtime); |
613b411c | 718 | |
bb0c0d6f | 719 | unit_destroy_runtime_data(UNIT(s), &s->exec_context); |
e66cf1a3 | 720 | |
00d9ef85 | 721 | unit_unref_uid_gid(UNIT(s), true); |
07b0b134 ML |
722 | } |
723 | ||
e1770af8 | 724 | static void swap_enter_active(Swap *s, SwapResult f) { |
e04aad61 LP |
725 | assert(s); |
726 | ||
a0fef983 | 727 | if (s->result == SWAP_SUCCESS) |
e1770af8 | 728 | s->result = f; |
e04aad61 LP |
729 | |
730 | swap_set_state(s, SWAP_ACTIVE); | |
731 | } | |
732 | ||
50864457 LP |
733 | static void swap_enter_dead_or_active(Swap *s, SwapResult f) { |
734 | assert(s); | |
735 | ||
9c1f969d | 736 | if (s->from_proc_swaps) { |
50864457 | 737 | swap_enter_active(s, f); |
9c1f969d HD |
738 | |
739 | LIST_FOREACH_OTHERS(same_devnode, other, s) | |
740 | if (UNIT(other)->job) | |
741 | swap_enter_dead_or_active(other, f); | |
742 | } else | |
50864457 LP |
743 | swap_enter_dead(s, f); |
744 | } | |
745 | ||
a232ebcc ZJS |
746 | static int state_to_kill_operation(Swap *s, SwapState state) { |
747 | if (state == SWAP_DEACTIVATING_SIGTERM) { | |
748 | if (unit_has_job_type(UNIT(s), JOB_RESTART)) | |
749 | return KILL_RESTART; | |
750 | else | |
751 | return KILL_TERMINATE; | |
752 | } | |
753 | ||
754 | return KILL_KILL; | |
755 | } | |
756 | ||
e1770af8 | 757 | static void swap_enter_signal(Swap *s, SwapState state, SwapResult f) { |
07b0b134 ML |
758 | int r; |
759 | ||
760 | assert(s); | |
e04aad61 | 761 | |
a0fef983 | 762 | if (s->result == SWAP_SUCCESS) |
e1770af8 | 763 | s->result = f; |
e04aad61 | 764 | |
a232ebcc ZJS |
765 | r = unit_kill_context(UNIT(s), |
766 | &s->kill_context, | |
767 | state_to_kill_operation(s, state), | |
768 | -1, | |
769 | s->control_pid, | |
770 | false); | |
cd2086fe LP |
771 | if (r < 0) |
772 | goto fail; | |
e04aad61 | 773 | |
cd2086fe | 774 | if (r > 0) { |
36c16a7c | 775 | r = swap_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec)); |
646134dc | 776 | if (r < 0) |
e04aad61 LP |
777 | goto fail; |
778 | ||
779 | swap_set_state(s, state); | |
50864457 | 780 | } else if (state == SWAP_DEACTIVATING_SIGTERM && s->kill_context.send_sigkill) |
ac84d1fb LP |
781 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, SWAP_SUCCESS); |
782 | else | |
50864457 | 783 | swap_enter_dead_or_active(s, SWAP_SUCCESS); |
e04aad61 LP |
784 | |
785 | return; | |
786 | ||
787 | fail: | |
f2341e0a | 788 | log_unit_warning_errno(UNIT(s), r, "Failed to kill processes: %m"); |
50864457 | 789 | swap_enter_dead_or_active(s, SWAP_FAILURE_RESOURCES); |
e04aad61 LP |
790 | } |
791 | ||
792 | static void swap_enter_activating(Swap *s) { | |
bf1d7ba7 KZ |
793 | _cleanup_free_ char *opts = NULL; |
794 | int r; | |
e04aad61 LP |
795 | |
796 | assert(s); | |
797 | ||
4c425434 | 798 | unit_warn_leftover_processes(UNIT(s), unit_log_leftover_process_start); |
a4634b21 | 799 | |
e04aad61 LP |
800 | s->control_command_id = SWAP_EXEC_ACTIVATE; |
801 | s->control_command = s->exec_command + SWAP_EXEC_ACTIVATE; | |
07b0b134 | 802 | |
86b23b07 | 803 | if (s->from_fragment) { |
7477451b | 804 | int priority = 0; |
47cb901e | 805 | |
bf1d7ba7 KZ |
806 | r = fstab_find_pri(s->parameters_fragment.options, &priority); |
807 | if (r < 0) | |
af4454cb LP |
808 | log_unit_warning_errno(UNIT(s), r, "Failed to parse swap priority \"%s\", ignoring: %m", s->parameters_fragment.options); |
809 | else if (r > 0 && s->parameters_fragment.priority_set) | |
810 | log_unit_warning(UNIT(s), "Duplicate swap priority configuration by Priority= and Options= fields."); | |
bf1d7ba7 | 811 | |
7477451b | 812 | if (r <= 0 && s->parameters_fragment.priority_set) { |
bf1d7ba7 KZ |
813 | if (s->parameters_fragment.options) |
814 | r = asprintf(&opts, "%s,pri=%i", s->parameters_fragment.options, s->parameters_fragment.priority); | |
815 | else | |
816 | r = asprintf(&opts, "pri=%i", s->parameters_fragment.priority); | |
6fca66a7 LP |
817 | if (r < 0) { |
818 | r = -ENOMEM; | |
bf1d7ba7 | 819 | goto fail; |
6fca66a7 | 820 | } |
e64d5235 | 821 | } |
86b23b07 JS |
822 | } |
823 | ||
cc137d53 | 824 | r = exec_command_set(s->control_command, "/sbin/swapon", "--fixpgsz", NULL); |
86b23b07 JS |
825 | if (r < 0) |
826 | goto fail; | |
4e85aff4 | 827 | |
bf1d7ba7 KZ |
828 | if (s->parameters_fragment.options || opts) { |
829 | r = exec_command_append(s->control_command, "-o", | |
af4454cb | 830 | opts ?: s->parameters_fragment.options, NULL); |
86b23b07 JS |
831 | if (r < 0) |
832 | goto fail; | |
833 | } | |
e04aad61 | 834 | |
86b23b07 | 835 | r = exec_command_append(s->control_command, s->what, NULL); |
e04aad61 LP |
836 | if (r < 0) |
837 | goto fail; | |
838 | ||
839 | swap_unwatch_control_pid(s); | |
840 | ||
646134dc ZJS |
841 | r = swap_spawn(s, s->control_command, &s->control_pid); |
842 | if (r < 0) | |
e04aad61 LP |
843 | goto fail; |
844 | ||
845 | swap_set_state(s, SWAP_ACTIVATING); | |
e04aad61 LP |
846 | return; |
847 | ||
848 | fail: | |
f2341e0a | 849 | log_unit_warning_errno(UNIT(s), r, "Failed to run 'swapon' task: %m"); |
50864457 | 850 | swap_enter_dead_or_active(s, SWAP_FAILURE_RESOURCES); |
e04aad61 LP |
851 | } |
852 | ||
e1770af8 | 853 | static void swap_enter_deactivating(Swap *s) { |
e04aad61 LP |
854 | int r; |
855 | ||
856 | assert(s); | |
857 | ||
e04aad61 LP |
858 | s->control_command_id = SWAP_EXEC_DEACTIVATE; |
859 | s->control_command = s->exec_command + SWAP_EXEC_DEACTIVATE; | |
860 | ||
646134dc | 861 | r = exec_command_set(s->control_command, |
e04aad61 LP |
862 | "/sbin/swapoff", |
863 | s->what, | |
646134dc ZJS |
864 | NULL); |
865 | if (r < 0) | |
e04aad61 LP |
866 | goto fail; |
867 | ||
868 | swap_unwatch_control_pid(s); | |
869 | ||
646134dc ZJS |
870 | r = swap_spawn(s, s->control_command, &s->control_pid); |
871 | if (r < 0) | |
e04aad61 LP |
872 | goto fail; |
873 | ||
874 | swap_set_state(s, SWAP_DEACTIVATING); | |
875 | ||
876 | return; | |
877 | ||
878 | fail: | |
f2341e0a | 879 | log_unit_warning_errno(UNIT(s), r, "Failed to run 'swapoff' task: %m"); |
50864457 | 880 | swap_enter_dead_or_active(s, SWAP_FAILURE_RESOURCES); |
e04aad61 LP |
881 | } |
882 | ||
31135818 LP |
883 | static void swap_cycle_clear(Swap *s) { |
884 | assert(s); | |
885 | ||
886 | s->result = SWAP_SUCCESS; | |
887 | exec_command_reset_status_array(s->exec_command, _SWAP_EXEC_COMMAND_MAX); | |
888 | UNIT(s)->reset_accounting = true; | |
889 | } | |
890 | ||
e04aad61 | 891 | static int swap_start(Unit *u) { |
03677889 | 892 | Swap *s = SWAP(u); |
07299350 | 893 | int r; |
e04aad61 LP |
894 | |
895 | assert(s); | |
896 | ||
50864457 | 897 | /* We cannot fulfill this request right now, try again later please! */ |
d31ae548 FB |
898 | if (IN_SET(s->state, |
899 | SWAP_DEACTIVATING, | |
900 | SWAP_DEACTIVATING_SIGTERM, | |
a8b689b7 YW |
901 | SWAP_DEACTIVATING_SIGKILL, |
902 | SWAP_CLEANING)) | |
e04aad61 LP |
903 | return -EAGAIN; |
904 | ||
50864457 | 905 | /* Already on it! */ |
e04aad61 LP |
906 | if (s->state == SWAP_ACTIVATING) |
907 | return 0; | |
908 | ||
d31ae548 | 909 | assert(IN_SET(s->state, SWAP_DEAD, SWAP_FAILED)); |
e04aad61 | 910 | |
75f86906 | 911 | if (detect_container() > 0) |
a5c3034f LP |
912 | return -EPERM; |
913 | ||
37cf8fee LP |
914 | /* If there's a job for another swap unit for the same node |
915 | * running, then let's not dispatch this one for now, and wait | |
916 | * until that other job has finished. */ | |
917 | LIST_FOREACH_OTHERS(same_devnode, other, s) | |
918 | if (UNIT(other)->job && UNIT(other)->job->state == JOB_RUNNING) | |
919 | return -EAGAIN; | |
920 | ||
4b58153d LP |
921 | r = unit_acquire_invocation_id(u); |
922 | if (r < 0) | |
923 | return r; | |
924 | ||
31135818 | 925 | swap_cycle_clear(s); |
e04aad61 | 926 | swap_enter_activating(s); |
82a2b6bb | 927 | return 1; |
07b0b134 ML |
928 | } |
929 | ||
930 | static int swap_stop(Unit *u) { | |
931 | Swap *s = SWAP(u); | |
07b0b134 ML |
932 | |
933 | assert(s); | |
934 | ||
50864457 LP |
935 | switch (s->state) { |
936 | ||
937 | case SWAP_DEACTIVATING: | |
938 | case SWAP_DEACTIVATING_SIGTERM: | |
939 | case SWAP_DEACTIVATING_SIGKILL: | |
940 | /* Already on it */ | |
e04aad61 | 941 | return 0; |
07b0b134 | 942 | |
50864457 LP |
943 | case SWAP_ACTIVATING: |
944 | case SWAP_ACTIVATING_DONE: | |
945 | /* There's a control process pending, directly enter kill mode */ | |
946 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGTERM, SWAP_SUCCESS); | |
947 | return 0; | |
07b0b134 | 948 | |
50864457 LP |
949 | case SWAP_ACTIVE: |
950 | if (detect_container() > 0) | |
951 | return -EPERM; | |
a5c3034f | 952 | |
50864457 LP |
953 | swap_enter_deactivating(s); |
954 | return 1; | |
955 | ||
a8b689b7 YW |
956 | case SWAP_CLEANING: |
957 | /* If we are currently cleaning, then abort it, brutally. */ | |
958 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, SWAP_SUCCESS); | |
959 | return 0; | |
960 | ||
50864457 | 961 | default: |
04499a70 | 962 | assert_not_reached(); |
50864457 | 963 | } |
07b0b134 ML |
964 | } |
965 | ||
966 | static int swap_serialize(Unit *u, FILE *f, FDSet *fds) { | |
967 | Swap *s = SWAP(u); | |
968 | ||
969 | assert(s); | |
970 | assert(f); | |
971 | assert(fds); | |
972 | ||
d68c645b LP |
973 | (void) serialize_item(f, "state", swap_state_to_string(s->state)); |
974 | (void) serialize_item(f, "result", swap_result_to_string(s->result)); | |
e04aad61 LP |
975 | |
976 | if (s->control_pid > 0) | |
d68c645b | 977 | (void) serialize_item_format(f, "control-pid", PID_FMT, s->control_pid); |
e04aad61 LP |
978 | |
979 | if (s->control_command_id >= 0) | |
d68c645b | 980 | (void) serialize_item(f, "control-command", swap_exec_command_to_string(s->control_command_id)); |
07b0b134 ML |
981 | |
982 | return 0; | |
983 | } | |
984 | ||
985 | static int swap_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
986 | Swap *s = SWAP(u); | |
987 | ||
988 | assert(s); | |
989 | assert(fds); | |
990 | ||
991 | if (streq(key, "state")) { | |
992 | SwapState state; | |
993 | ||
646134dc ZJS |
994 | state = swap_state_from_string(value); |
995 | if (state < 0) | |
f2341e0a | 996 | log_unit_debug(u, "Failed to parse state value: %s", value); |
07b0b134 ML |
997 | else |
998 | s->deserialized_state = state; | |
e1770af8 LP |
999 | } else if (streq(key, "result")) { |
1000 | SwapResult f; | |
1001 | ||
1002 | f = swap_result_from_string(value); | |
1003 | if (f < 0) | |
f2341e0a | 1004 | log_unit_debug(u, "Failed to parse result value: %s", value); |
e1770af8 LP |
1005 | else if (f != SWAP_SUCCESS) |
1006 | s->result = f; | |
e04aad61 LP |
1007 | } else if (streq(key, "control-pid")) { |
1008 | pid_t pid; | |
1009 | ||
1010 | if (parse_pid(value, &pid) < 0) | |
f2341e0a | 1011 | log_unit_debug(u, "Failed to parse control-pid value: %s", value); |
e04aad61 LP |
1012 | else |
1013 | s->control_pid = pid; | |
1014 | ||
1015 | } else if (streq(key, "control-command")) { | |
1016 | SwapExecCommand id; | |
1017 | ||
646134dc ZJS |
1018 | id = swap_exec_command_from_string(value); |
1019 | if (id < 0) | |
f2341e0a | 1020 | log_unit_debug(u, "Failed to parse exec-command value: %s", value); |
e04aad61 LP |
1021 | else { |
1022 | s->control_command_id = id; | |
1023 | s->control_command = s->exec_command + id; | |
1024 | } | |
07b0b134 | 1025 | } else |
f2341e0a | 1026 | log_unit_debug(u, "Unknown serialization key: %s", key); |
07b0b134 ML |
1027 | |
1028 | return 0; | |
1029 | } | |
1030 | ||
e04aad61 LP |
1031 | static void swap_sigchld_event(Unit *u, pid_t pid, int code, int status) { |
1032 | Swap *s = SWAP(u); | |
e1770af8 | 1033 | SwapResult f; |
e04aad61 LP |
1034 | |
1035 | assert(s); | |
1036 | assert(pid >= 0); | |
1037 | ||
1038 | if (pid != s->control_pid) | |
1039 | return; | |
1040 | ||
bcce581d LP |
1041 | /* Let's scan /proc/swaps before we process SIGCHLD. For the reasoning see the similar code in |
1042 | * mount.c */ | |
1043 | (void) swap_process_proc_swaps(u->manager); | |
1044 | ||
e04aad61 LP |
1045 | s->control_pid = 0; |
1046 | ||
1f0958f6 | 1047 | if (is_clean_exit(code, status, EXIT_CLEAN_COMMAND, NULL)) |
e1770af8 LP |
1048 | f = SWAP_SUCCESS; |
1049 | else if (code == CLD_EXITED) | |
1050 | f = SWAP_FAILURE_EXIT_CODE; | |
1051 | else if (code == CLD_KILLED) | |
1052 | f = SWAP_FAILURE_SIGNAL; | |
1053 | else if (code == CLD_DUMPED) | |
1054 | f = SWAP_FAILURE_CORE_DUMP; | |
1055 | else | |
04499a70 | 1056 | assert_not_reached(); |
e1770af8 | 1057 | |
a0fef983 | 1058 | if (s->result == SWAP_SUCCESS) |
e1770af8 | 1059 | s->result = f; |
e04aad61 LP |
1060 | |
1061 | if (s->control_command) { | |
6ea832a2 | 1062 | exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status); |
e1770af8 | 1063 | |
e04aad61 LP |
1064 | s->control_command = NULL; |
1065 | s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; | |
1066 | } | |
1067 | ||
91bbd9b7 | 1068 | unit_log_process_exit( |
5cc2cd1c | 1069 | u, |
91bbd9b7 LP |
1070 | "Swap process", |
1071 | swap_exec_command_to_string(s->control_command_id), | |
5cc2cd1c | 1072 | f == SWAP_SUCCESS, |
91bbd9b7 | 1073 | code, status); |
e04aad61 LP |
1074 | |
1075 | switch (s->state) { | |
1076 | ||
1077 | case SWAP_ACTIVATING: | |
5bcb0f2b | 1078 | case SWAP_ACTIVATING_DONE: |
e04aad61 | 1079 | |
50864457 | 1080 | if (f == SWAP_SUCCESS || s->from_proc_swaps) |
e1770af8 | 1081 | swap_enter_active(s, f); |
e04aad61 | 1082 | else |
e1770af8 | 1083 | swap_enter_dead(s, f); |
e04aad61 LP |
1084 | break; |
1085 | ||
1086 | case SWAP_DEACTIVATING: | |
1087 | case SWAP_DEACTIVATING_SIGKILL: | |
1088 | case SWAP_DEACTIVATING_SIGTERM: | |
1089 | ||
50864457 | 1090 | swap_enter_dead_or_active(s, f); |
e04aad61 LP |
1091 | break; |
1092 | ||
a8b689b7 YW |
1093 | case SWAP_CLEANING: |
1094 | if (s->clean_result == SWAP_SUCCESS) | |
1095 | s->clean_result = f; | |
1096 | ||
1097 | swap_enter_dead(s, SWAP_SUCCESS); | |
1098 | break; | |
1099 | ||
e04aad61 | 1100 | default: |
04499a70 | 1101 | assert_not_reached(); |
e04aad61 LP |
1102 | } |
1103 | ||
1104 | /* Notify clients about changed exit status */ | |
1105 | unit_add_to_dbus_queue(u); | |
e04aad61 LP |
1106 | } |
1107 | ||
718db961 LP |
1108 | static int swap_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) { |
1109 | Swap *s = SWAP(userdata); | |
e04aad61 LP |
1110 | |
1111 | assert(s); | |
718db961 | 1112 | assert(s->timer_event_source == source); |
e04aad61 LP |
1113 | |
1114 | switch (s->state) { | |
1115 | ||
1116 | case SWAP_ACTIVATING: | |
5bcb0f2b | 1117 | case SWAP_ACTIVATING_DONE: |
f2341e0a | 1118 | log_unit_warning(UNIT(s), "Activation timed out. Stopping."); |
50864457 | 1119 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT); |
e04aad61 LP |
1120 | break; |
1121 | ||
1122 | case SWAP_DEACTIVATING: | |
f2341e0a | 1123 | log_unit_warning(UNIT(s), "Deactivation timed out. Stopping."); |
e1770af8 | 1124 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT); |
e04aad61 LP |
1125 | break; |
1126 | ||
e04aad61 | 1127 | case SWAP_DEACTIVATING_SIGTERM: |
4819ff03 | 1128 | if (s->kill_context.send_sigkill) { |
50864457 | 1129 | log_unit_warning(UNIT(s), "Swap process timed out. Killing."); |
e1770af8 | 1130 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, SWAP_FAILURE_TIMEOUT); |
ba035df2 | 1131 | } else { |
50864457 LP |
1132 | log_unit_warning(UNIT(s), "Swap process timed out. Skipping SIGKILL. Ignoring."); |
1133 | swap_enter_dead_or_active(s, SWAP_FAILURE_TIMEOUT); | |
ba035df2 | 1134 | } |
e04aad61 LP |
1135 | break; |
1136 | ||
e04aad61 | 1137 | case SWAP_DEACTIVATING_SIGKILL: |
f2341e0a | 1138 | log_unit_warning(UNIT(s), "Swap process still around after SIGKILL. Ignoring."); |
50864457 | 1139 | swap_enter_dead_or_active(s, SWAP_FAILURE_TIMEOUT); |
e04aad61 LP |
1140 | break; |
1141 | ||
a8b689b7 YW |
1142 | case SWAP_CLEANING: |
1143 | log_unit_warning(UNIT(s), "Cleaning timed out. killing."); | |
1144 | ||
1145 | if (s->clean_result == SWAP_SUCCESS) | |
1146 | s->clean_result = SWAP_FAILURE_TIMEOUT; | |
1147 | ||
1148 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, 0); | |
1149 | break; | |
1150 | ||
e04aad61 | 1151 | default: |
04499a70 | 1152 | assert_not_reached(); |
e04aad61 | 1153 | } |
718db961 LP |
1154 | |
1155 | return 0; | |
e04aad61 LP |
1156 | } |
1157 | ||
1158 | static int swap_load_proc_swaps(Manager *m, bool set_flags) { | |
e04aad61 LP |
1159 | assert(m); |
1160 | ||
07b0b134 | 1161 | rewind(m->proc_swaps); |
bab45044 | 1162 | |
4e85aff4 | 1163 | (void) fscanf(m->proc_swaps, "%*s %*s %*s %*s %*s\n"); |
07b0b134 | 1164 | |
fe96c0f8 | 1165 | for (unsigned i = 1;; i++) { |
9fb3675e | 1166 | _cleanup_free_ char *dev = NULL, *d = NULL; |
07b0b134 ML |
1167 | int prio = 0, k; |
1168 | ||
646134dc ZJS |
1169 | k = fscanf(m->proc_swaps, |
1170 | "%ms " /* device/file */ | |
1171 | "%*s " /* type of swap */ | |
1172 | "%*s " /* swap size */ | |
1173 | "%*s " /* used */ | |
1174 | "%i\n", /* priority */ | |
1175 | &dev, &prio); | |
1176 | if (k != 2) { | |
07b0b134 | 1177 | if (k == EOF) |
4e85aff4 | 1178 | break; |
07b0b134 | 1179 | |
628c89cc | 1180 | log_warning("Failed to parse /proc/swaps:%u.", i); |
e04aad61 | 1181 | continue; |
07b0b134 | 1182 | } |
07b0b134 | 1183 | |
e437538f ZJS |
1184 | ssize_t l = cunescape(dev, UNESCAPE_RELAX, &d); |
1185 | if (l < 0) | |
1186 | return log_error_errno(l, "Failed to unescape device path: %m"); | |
628c89cc | 1187 | |
485ae697 | 1188 | device_found_node(m, d, DEVICE_FOUND_SWAP, DEVICE_FOUND_SWAP); |
4e85aff4 | 1189 | |
eb04385d | 1190 | (void) swap_process_new(m, d, prio, set_flags); |
07b0b134 ML |
1191 | } |
1192 | ||
eb04385d | 1193 | return 0; |
e04aad61 LP |
1194 | } |
1195 | ||
bcce581d | 1196 | static int swap_process_proc_swaps(Manager *m) { |
4e434314 LP |
1197 | int r; |
1198 | ||
1199 | assert(m); | |
4e434314 | 1200 | |
646134dc ZJS |
1201 | r = swap_load_proc_swaps(m, true); |
1202 | if (r < 0) { | |
da927ba9 | 1203 | log_error_errno(r, "Failed to reread /proc/swaps: %m"); |
e04aad61 LP |
1204 | |
1205 | /* Reset flags, just in case, for late calls */ | |
595ed347 MS |
1206 | LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) { |
1207 | Swap *swap = SWAP(u); | |
e04aad61 | 1208 | |
c73f413d FS |
1209 | assert(swap); |
1210 | ||
e04aad61 LP |
1211 | swap->is_active = swap->just_activated = false; |
1212 | } | |
1213 | ||
1214 | return 0; | |
1215 | } | |
1216 | ||
1217 | manager_dispatch_load_queue(m); | |
1218 | ||
595ed347 MS |
1219 | LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) { |
1220 | Swap *swap = SWAP(u); | |
e04aad61 | 1221 | |
c73f413d FS |
1222 | assert(swap); |
1223 | ||
e04aad61 | 1224 | if (!swap->is_active) { |
e04aad61 | 1225 | |
e04aad61 LP |
1226 | swap_unset_proc_swaps(swap); |
1227 | ||
1228 | switch (swap->state) { | |
1229 | ||
1230 | case SWAP_ACTIVE: | |
ba6fbb2c | 1231 | /* This has just been deactivated */ |
e1770af8 | 1232 | swap_enter_dead(swap, SWAP_SUCCESS); |
e04aad61 LP |
1233 | break; |
1234 | ||
1235 | default: | |
5bcb0f2b | 1236 | /* Fire again */ |
e04aad61 LP |
1237 | swap_set_state(swap, swap->state); |
1238 | break; | |
1239 | } | |
1240 | ||
628c89cc | 1241 | if (swap->what) |
b1ba0ce8 | 1242 | device_found_node(m, swap->what, DEVICE_NOT_FOUND, DEVICE_FOUND_SWAP); |
628c89cc | 1243 | |
e04aad61 LP |
1244 | } else if (swap->just_activated) { |
1245 | ||
1246 | /* New swap entry */ | |
1247 | ||
1248 | switch (swap->state) { | |
1249 | ||
1250 | case SWAP_DEAD: | |
1251 | case SWAP_FAILED: | |
31135818 LP |
1252 | (void) unit_acquire_invocation_id(u); |
1253 | swap_cycle_clear(swap); | |
e1770af8 | 1254 | swap_enter_active(swap, SWAP_SUCCESS); |
e04aad61 LP |
1255 | break; |
1256 | ||
5bcb0f2b LP |
1257 | case SWAP_ACTIVATING: |
1258 | swap_set_state(swap, SWAP_ACTIVATING_DONE); | |
1259 | break; | |
1260 | ||
e04aad61 LP |
1261 | default: |
1262 | /* Nothing really changed, but let's | |
1263 | * issue an notification call | |
1264 | * nonetheless, in case somebody is | |
1265 | * waiting for this. */ | |
1266 | swap_set_state(swap, swap->state); | |
1267 | break; | |
1268 | } | |
1269 | } | |
1270 | ||
1271 | /* Reset the flags for later calls */ | |
1272 | swap->is_active = swap->just_activated = false; | |
1273 | } | |
1274 | ||
1275 | return 1; | |
1276 | } | |
1277 | ||
bcce581d | 1278 | static int swap_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) { |
99534007 | 1279 | Manager *m = ASSERT_PTR(userdata); |
bcce581d | 1280 | |
bcce581d LP |
1281 | assert(revents & EPOLLPRI); |
1282 | ||
1283 | return swap_process_proc_swaps(m); | |
1284 | } | |
1285 | ||
e04aad61 LP |
1286 | static Unit *swap_following(Unit *u) { |
1287 | Swap *s = SWAP(u); | |
03677889 | 1288 | Swap *first = NULL; |
e04aad61 LP |
1289 | |
1290 | assert(s); | |
1291 | ||
cdc89820 ZJS |
1292 | /* If the user configured the swap through /etc/fstab or |
1293 | * a device unit, follow that. */ | |
1294 | ||
1295 | if (s->from_fragment) | |
e04aad61 LP |
1296 | return NULL; |
1297 | ||
caac2704 | 1298 | LIST_FOREACH_OTHERS(same_devnode, other, s) |
cdc89820 ZJS |
1299 | if (other->from_fragment) |
1300 | return UNIT(other); | |
1301 | ||
b938cb90 | 1302 | /* Otherwise, make everybody follow the unit that's named after |
cdc89820 ZJS |
1303 | * the swap device in the kernel */ |
1304 | ||
1305 | if (streq_ptr(s->what, s->devnode)) | |
1306 | return NULL; | |
e04aad61 | 1307 | |
bd335c96 | 1308 | LIST_FOREACH(same_devnode, other, s->same_devnode_next) |
9670d583 | 1309 | if (streq_ptr(other->what, other->devnode)) |
e04aad61 LP |
1310 | return UNIT(other); |
1311 | ||
bd335c96 | 1312 | LIST_FOREACH_BACKWARDS(same_devnode, other, s->same_devnode_prev) { |
9670d583 | 1313 | if (streq_ptr(other->what, other->devnode)) |
e04aad61 LP |
1314 | return UNIT(other); |
1315 | ||
1316 | first = other; | |
1317 | } | |
1318 | ||
cdc89820 | 1319 | /* Fall back to the first on the list */ |
e04aad61 | 1320 | return UNIT(first); |
07b0b134 ML |
1321 | } |
1322 | ||
6210e7fc | 1323 | static int swap_following_set(Unit *u, Set **_set) { |
03677889 | 1324 | Swap *s = SWAP(u); |
af4fa99d | 1325 | _cleanup_set_free_ Set *set = NULL; |
6210e7fc LP |
1326 | int r; |
1327 | ||
1328 | assert(s); | |
1329 | assert(_set); | |
1330 | ||
9670d583 | 1331 | if (LIST_JUST_US(same_devnode, s)) { |
6210e7fc LP |
1332 | *_set = NULL; |
1333 | return 0; | |
1334 | } | |
1335 | ||
d5099efc | 1336 | set = set_new(NULL); |
5bcb0f2b | 1337 | if (!set) |
6210e7fc LP |
1338 | return -ENOMEM; |
1339 | ||
caac2704 | 1340 | LIST_FOREACH_OTHERS(same_devnode, other, s) { |
5bcb0f2b LP |
1341 | r = set_put(set, other); |
1342 | if (r < 0) | |
95f14a3e | 1343 | return r; |
5bcb0f2b | 1344 | } |
6210e7fc | 1345 | |
95f14a3e | 1346 | *_set = TAKE_PTR(set); |
6210e7fc | 1347 | return 1; |
6210e7fc LP |
1348 | } |
1349 | ||
07b0b134 ML |
1350 | static void swap_shutdown(Manager *m) { |
1351 | assert(m); | |
1352 | ||
5dcadb4c | 1353 | m->swap_event_source = sd_event_source_disable_unref(m->swap_event_source); |
74ca738f | 1354 | m->proc_swaps = safe_fclose(m->proc_swaps); |
525d3cc7 | 1355 | m->swaps_by_devnode = hashmap_free(m->swaps_by_devnode); |
07b0b134 ML |
1356 | } |
1357 | ||
ba64af90 | 1358 | static void swap_enumerate(Manager *m) { |
07b0b134 | 1359 | int r; |
9670d583 | 1360 | |
07b0b134 ML |
1361 | assert(m); |
1362 | ||
4e434314 | 1363 | if (!m->proc_swaps) { |
646134dc | 1364 | m->proc_swaps = fopen("/proc/swaps", "re"); |
ba64af90 LP |
1365 | if (!m->proc_swaps) { |
1366 | if (errno == ENOENT) | |
cb209a04 | 1367 | log_debug_errno(errno, "Not swap enabled, skipping enumeration."); |
ba64af90 | 1368 | else |
cb209a04 | 1369 | log_warning_errno(errno, "Failed to open /proc/swaps, ignoring: %m"); |
ba64af90 LP |
1370 | |
1371 | return; | |
1372 | } | |
4e434314 | 1373 | |
151b9b96 | 1374 | r = sd_event_add_io(m->event, &m->swap_event_source, fileno(m->proc_swaps), EPOLLPRI, swap_dispatch_io, m); |
ba64af90 LP |
1375 | if (r < 0) { |
1376 | log_error_errno(r, "Failed to watch /proc/swaps: %m"); | |
29083707 | 1377 | goto fail; |
ba64af90 | 1378 | } |
29083707 LP |
1379 | |
1380 | /* Dispatch this before we dispatch SIGCHLD, so that | |
1381 | * we always get the events from /proc/swaps before | |
1382 | * the SIGCHLD of /sbin/swapon. */ | |
83231637 | 1383 | r = sd_event_source_set_priority(m->swap_event_source, SD_EVENT_PRIORITY_NORMAL-10); |
ba64af90 LP |
1384 | if (r < 0) { |
1385 | log_error_errno(r, "Failed to change /proc/swaps priority: %m"); | |
718db961 | 1386 | goto fail; |
ba64af90 | 1387 | } |
7dfbe2e3 TG |
1388 | |
1389 | (void) sd_event_source_set_description(m->swap_event_source, "swap-proc"); | |
4e434314 LP |
1390 | } |
1391 | ||
646134dc ZJS |
1392 | r = swap_load_proc_swaps(m, false); |
1393 | if (r < 0) | |
718db961 LP |
1394 | goto fail; |
1395 | ||
ba64af90 | 1396 | return; |
07b0b134 | 1397 | |
718db961 LP |
1398 | fail: |
1399 | swap_shutdown(m); | |
07b0b134 ML |
1400 | } |
1401 | ||
4366e598 | 1402 | int swap_process_device_new(Manager *m, sd_device *dev) { |
9670d583 | 1403 | _cleanup_free_ char *e = NULL; |
a1af8372 | 1404 | const char *dn; |
cabf58b2 | 1405 | Unit *u; |
c53aafb7 | 1406 | int r; |
9670d583 LP |
1407 | |
1408 | assert(m); | |
1409 | assert(dev); | |
1410 | ||
e82c6e8b | 1411 | if (sd_device_get_devname(dev, &dn) < 0) |
9670d583 LP |
1412 | return 0; |
1413 | ||
7410616c | 1414 | r = unit_name_from_path(dn, ".swap", &e); |
e82c6e8b LP |
1415 | if (r < 0) { |
1416 | log_debug_errno(r, "Cannot convert device name '%s' to unit name, ignoring: %m", dn); | |
1417 | return 0; | |
1418 | } | |
9670d583 | 1419 | |
cabf58b2 FB |
1420 | u = manager_get_unit(m, e); |
1421 | if (u) | |
1422 | r = swap_set_devnode(SWAP(u), dn); | |
9670d583 | 1423 | |
4366e598 | 1424 | FOREACH_DEVICE_DEVLINK(dev, devlink) { |
9670d583 | 1425 | _cleanup_free_ char *n = NULL; |
7410616c | 1426 | int q; |
9670d583 | 1427 | |
4366e598 | 1428 | q = unit_name_from_path(devlink, ".swap", &n); |
03e52e8c | 1429 | if (q == -EINVAL) /* If the name is not convertible to unit name, we can't manage it */ |
598a6a84 | 1430 | continue; |
7410616c LP |
1431 | if (q < 0) |
1432 | return q; | |
9670d583 | 1433 | |
cabf58b2 FB |
1434 | u = manager_get_unit(m, n); |
1435 | if (u) { | |
1436 | q = swap_set_devnode(SWAP(u), dn); | |
9670d583 LP |
1437 | if (q < 0) |
1438 | r = q; | |
1439 | } | |
1440 | } | |
1441 | ||
1442 | return r; | |
1443 | } | |
1444 | ||
4366e598 | 1445 | int swap_process_device_remove(Manager *m, sd_device *dev) { |
9670d583 | 1446 | const char *dn; |
c53aafb7 | 1447 | int r; |
9670d583 LP |
1448 | Swap *s; |
1449 | ||
4366e598 YW |
1450 | r = sd_device_get_devname(dev, &dn); |
1451 | if (r < 0) | |
9670d583 LP |
1452 | return 0; |
1453 | ||
1454 | while ((s = hashmap_get(m->swaps_by_devnode, dn))) { | |
1455 | int q; | |
1456 | ||
1457 | q = swap_set_devnode(s, NULL); | |
1458 | if (q < 0) | |
1459 | r = q; | |
1460 | } | |
1461 | ||
1462 | return r; | |
1463 | } | |
1464 | ||
fdf20a31 | 1465 | static void swap_reset_failed(Unit *u) { |
5632e374 LP |
1466 | Swap *s = SWAP(u); |
1467 | ||
1468 | assert(s); | |
1469 | ||
fdf20a31 | 1470 | if (s->state == SWAP_FAILED) |
5632e374 | 1471 | swap_set_state(s, SWAP_DEAD); |
e04aad61 | 1472 | |
e1770af8 | 1473 | s->result = SWAP_SUCCESS; |
a8b689b7 | 1474 | s->clean_result = SWAP_SUCCESS; |
5632e374 LP |
1475 | } |
1476 | ||
a721cd00 LP |
1477 | static int swap_kill(Unit *u, KillWho who, int signo, int code, int value, sd_bus_error *error) { |
1478 | return unit_kill_common(u, who, signo, code, value, -1, SWAP(u)->control_pid, error); | |
8a0867d6 LP |
1479 | } |
1480 | ||
7a7821c8 | 1481 | static int swap_get_timeout(Unit *u, usec_t *timeout) { |
68db7a3b | 1482 | Swap *s = SWAP(u); |
7a7821c8 | 1483 | usec_t t; |
68db7a3b ZJS |
1484 | int r; |
1485 | ||
c73f413d FS |
1486 | assert(s); |
1487 | assert(u); | |
1488 | ||
68db7a3b ZJS |
1489 | if (!s->timer_event_source) |
1490 | return 0; | |
1491 | ||
7a7821c8 | 1492 | r = sd_event_source_get_time(s->timer_event_source, &t); |
68db7a3b ZJS |
1493 | if (r < 0) |
1494 | return r; | |
7a7821c8 LP |
1495 | if (t == USEC_INFINITY) |
1496 | return 0; | |
68db7a3b | 1497 | |
7a7821c8 | 1498 | *timeout = t; |
68db7a3b ZJS |
1499 | return 1; |
1500 | } | |
1501 | ||
1c2e9646 | 1502 | static bool swap_supported(void) { |
0faacd47 LP |
1503 | static int supported = -1; |
1504 | ||
1505 | /* If swap support is not available in the kernel, or we are | |
1506 | * running in a container we don't support swap units, and any | |
1507 | * attempts to starting one should fail immediately. */ | |
1508 | ||
1509 | if (supported < 0) | |
1510 | supported = | |
1511 | access("/proc/swaps", F_OK) >= 0 && | |
75f86906 | 1512 | detect_container() <= 0; |
0faacd47 LP |
1513 | |
1514 | return supported; | |
1515 | } | |
1516 | ||
291d565a LP |
1517 | static int swap_control_pid(Unit *u) { |
1518 | Swap *s = SWAP(u); | |
1519 | ||
1520 | assert(s); | |
1521 | ||
1522 | return s->control_pid; | |
1523 | } | |
1524 | ||
a8b689b7 YW |
1525 | static int swap_clean(Unit *u, ExecCleanMask mask) { |
1526 | _cleanup_strv_free_ char **l = NULL; | |
1527 | Swap *s = SWAP(u); | |
1528 | int r; | |
1529 | ||
1530 | assert(s); | |
1531 | assert(mask != 0); | |
1532 | ||
1533 | if (s->state != SWAP_DEAD) | |
1534 | return -EBUSY; | |
1535 | ||
1536 | r = exec_context_get_clean_directories(&s->exec_context, u->manager->prefix, mask, &l); | |
1537 | if (r < 0) | |
1538 | return r; | |
1539 | ||
1540 | if (strv_isempty(l)) | |
1541 | return -EUNATCH; | |
1542 | ||
1543 | swap_unwatch_control_pid(s); | |
1544 | s->clean_result = SWAP_SUCCESS; | |
1545 | s->control_command = NULL; | |
1546 | s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; | |
1547 | ||
1548 | r = swap_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->exec_context.timeout_clean_usec)); | |
1549 | if (r < 0) | |
1550 | goto fail; | |
1551 | ||
1552 | r = unit_fork_and_watch_rm_rf(u, l, &s->control_pid); | |
1553 | if (r < 0) | |
1554 | goto fail; | |
1555 | ||
1556 | swap_set_state(s, SWAP_CLEANING); | |
1557 | ||
1558 | return 0; | |
1559 | ||
1560 | fail: | |
1561 | log_unit_warning_errno(u, r, "Failed to initiate cleaning: %m"); | |
1562 | s->clean_result = SWAP_FAILURE_RESOURCES; | |
5dcadb4c | 1563 | s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source); |
a8b689b7 YW |
1564 | return r; |
1565 | } | |
1566 | ||
1567 | static int swap_can_clean(Unit *u, ExecCleanMask *ret) { | |
1568 | Swap *s = SWAP(u); | |
1569 | ||
1570 | assert(s); | |
1571 | ||
1572 | return exec_context_get_clean_mask(&s->exec_context, ret); | |
1573 | } | |
1574 | ||
705578c3 | 1575 | static int swap_can_start(Unit *u) { |
9727f242 DDM |
1576 | Swap *s = SWAP(u); |
1577 | int r; | |
1578 | ||
1579 | assert(s); | |
1580 | ||
1581 | r = unit_test_start_limit(u); | |
1582 | if (r < 0) { | |
1583 | swap_enter_dead(s, SWAP_FAILURE_START_LIMIT_HIT); | |
1584 | return r; | |
1585 | } | |
1586 | ||
705578c3 | 1587 | return 1; |
9727f242 DDM |
1588 | } |
1589 | ||
e04aad61 | 1590 | static const char* const swap_exec_command_table[_SWAP_EXEC_COMMAND_MAX] = { |
48d83e33 | 1591 | [SWAP_EXEC_ACTIVATE] = "ExecActivate", |
e04aad61 LP |
1592 | [SWAP_EXEC_DEACTIVATE] = "ExecDeactivate", |
1593 | }; | |
1594 | ||
1595 | DEFINE_STRING_TABLE_LOOKUP(swap_exec_command, SwapExecCommand); | |
1596 | ||
e1770af8 | 1597 | static const char* const swap_result_table[_SWAP_RESULT_MAX] = { |
48d83e33 ZJS |
1598 | [SWAP_SUCCESS] = "success", |
1599 | [SWAP_FAILURE_RESOURCES] = "resources", | |
1600 | [SWAP_FAILURE_TIMEOUT] = "timeout", | |
1601 | [SWAP_FAILURE_EXIT_CODE] = "exit-code", | |
1602 | [SWAP_FAILURE_SIGNAL] = "signal", | |
1603 | [SWAP_FAILURE_CORE_DUMP] = "core-dump", | |
07299350 | 1604 | [SWAP_FAILURE_START_LIMIT_HIT] = "start-limit-hit", |
e1770af8 LP |
1605 | }; |
1606 | ||
1607 | DEFINE_STRING_TABLE_LOOKUP(swap_result, SwapResult); | |
1608 | ||
07b0b134 | 1609 | const UnitVTable swap_vtable = { |
7d17cfbc | 1610 | .object_size = sizeof(Swap), |
718db961 LP |
1611 | .exec_context_offset = offsetof(Swap, exec_context), |
1612 | .cgroup_context_offset = offsetof(Swap, cgroup_context), | |
1613 | .kill_context_offset = offsetof(Swap, kill_context), | |
613b411c | 1614 | .exec_runtime_offset = offsetof(Swap, exec_runtime), |
3ef63c31 | 1615 | |
f975e971 LP |
1616 | .sections = |
1617 | "Unit\0" | |
1618 | "Swap\0" | |
1619 | "Install\0", | |
4ad49000 | 1620 | .private_section = "Swap", |
71645aca | 1621 | |
c80a9a33 LP |
1622 | .can_fail = true, |
1623 | ||
4e85aff4 | 1624 | .init = swap_init, |
07b0b134 | 1625 | .load = swap_load, |
6e620bec | 1626 | .done = swap_done, |
07b0b134 ML |
1627 | |
1628 | .coldplug = swap_coldplug, | |
1629 | ||
1630 | .dump = swap_dump, | |
1631 | ||
1632 | .start = swap_start, | |
1633 | .stop = swap_stop, | |
1634 | ||
8a0867d6 | 1635 | .kill = swap_kill, |
a8b689b7 YW |
1636 | .clean = swap_clean, |
1637 | .can_clean = swap_can_clean, | |
8a0867d6 | 1638 | |
68db7a3b ZJS |
1639 | .get_timeout = swap_get_timeout, |
1640 | ||
07b0b134 ML |
1641 | .serialize = swap_serialize, |
1642 | .deserialize_item = swap_deserialize_item, | |
1643 | ||
1644 | .active_state = swap_active_state, | |
1645 | .sub_state_to_string = swap_sub_state_to_string, | |
1646 | ||
52a12341 YW |
1647 | .will_restart = unit_will_restart_default, |
1648 | ||
f2f725e5 | 1649 | .may_gc = swap_may_gc, |
39c79477 | 1650 | .is_extrinsic = swap_is_extrinsic, |
07b0b134 | 1651 | |
e04aad61 | 1652 | .sigchld_event = swap_sigchld_event, |
e04aad61 LP |
1653 | |
1654 | .reset_failed = swap_reset_failed, | |
1655 | ||
291d565a LP |
1656 | .control_pid = swap_control_pid, |
1657 | ||
74c964d3 LP |
1658 | .bus_set_property = bus_swap_set_property, |
1659 | .bus_commit_properties = bus_swap_commit_properties, | |
07b0b134 | 1660 | |
e04aad61 | 1661 | .following = swap_following, |
6210e7fc | 1662 | .following_set = swap_following_set, |
5632e374 | 1663 | |
6e620bec | 1664 | .enumerate = swap_enumerate, |
c6918296 | 1665 | .shutdown = swap_shutdown, |
0faacd47 | 1666 | .supported = swap_supported, |
c6918296 MS |
1667 | |
1668 | .status_message_formats = { | |
1669 | .starting_stopping = { | |
1670 | [0] = "Activating swap %s...", | |
1671 | [1] = "Deactivating swap %s...", | |
1672 | }, | |
1673 | .finished_start_job = { | |
1674 | [JOB_DONE] = "Activated swap %s.", | |
1675 | [JOB_FAILED] = "Failed to activate swap %s.", | |
c6918296 MS |
1676 | [JOB_TIMEOUT] = "Timed out activating swap %s.", |
1677 | }, | |
1678 | .finished_stop_job = { | |
1679 | [JOB_DONE] = "Deactivated swap %s.", | |
1680 | [JOB_FAILED] = "Failed deactivating swap %s.", | |
1681 | [JOB_TIMEOUT] = "Timed out deactivating swap %s.", | |
1682 | }, | |
1683 | }, | |
9727f242 | 1684 | |
705578c3 | 1685 | .can_start = swap_can_start, |
b2bfd121 LP |
1686 | |
1687 | .notify_plymouth = true, | |
07b0b134 | 1688 | }; |