]>
Commit | Line | Data |
---|---|---|
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 | ||
39c79477 ZJS |
58 | _pure_ static UnitActiveState swap_active_state(Unit *u) { |
59 | assert(u); | |
60 | ||
61 | return state_translation_table[SWAP(u)->state]; | |
62 | } | |
63 | ||
64 | _pure_ static const char *swap_sub_state_to_string(Unit *u) { | |
65 | assert(u); | |
66 | ||
67 | return swap_state_to_string(SWAP(u)->state); | |
68 | } | |
69 | ||
70 | _pure_ static bool swap_may_gc(Unit *u) { | |
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 | ||
81 | _pure_ static bool swap_is_extrinsic(Unit *u) { | |
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 | |
e8a565cb | 173 | s->exec_runtime = exec_runtime_unref(s->exec_runtime, false); |
e04aad61 LP |
174 | exec_command_done_array(s->exec_command, _SWAP_EXEC_COMMAND_MAX); |
175 | s->control_command = NULL; | |
176 | ||
29206d46 LP |
177 | dynamic_creds_unref(&s->dynamic_creds); |
178 | ||
e04aad61 LP |
179 | swap_unwatch_control_pid(s); |
180 | ||
5dcadb4c | 181 | s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source); |
718db961 LP |
182 | } |
183 | ||
36c16a7c | 184 | static int swap_arm_timer(Swap *s, usec_t usec) { |
718db961 LP |
185 | int r; |
186 | ||
187 | assert(s); | |
188 | ||
718db961 | 189 | if (s->timer_event_source) { |
36c16a7c | 190 | r = sd_event_source_set_time(s->timer_event_source, usec); |
718db961 LP |
191 | if (r < 0) |
192 | return r; | |
193 | ||
194 | return sd_event_source_set_enabled(s->timer_event_source, SD_EVENT_ONESHOT); | |
195 | } | |
196 | ||
36c16a7c LP |
197 | if (usec == USEC_INFINITY) |
198 | return 0; | |
199 | ||
7dfbe2e3 | 200 | r = sd_event_add_time( |
6a0f1f6d LP |
201 | UNIT(s)->manager->event, |
202 | &s->timer_event_source, | |
203 | CLOCK_MONOTONIC, | |
36c16a7c | 204 | usec, 0, |
6a0f1f6d | 205 | swap_dispatch_timer, s); |
7dfbe2e3 TG |
206 | if (r < 0) |
207 | return r; | |
208 | ||
209 | (void) sd_event_source_set_description(s->timer_event_source, "swap-timer"); | |
210 | ||
211 | return 0; | |
07b0b134 ML |
212 | } |
213 | ||
61f9cf4e LP |
214 | static SwapParameters* swap_get_parameters(Swap *s) { |
215 | assert(s); | |
216 | ||
217 | if (s->from_proc_swaps) | |
218 | return &s->parameters_proc_swaps; | |
219 | ||
220 | if (s->from_fragment) | |
221 | return &s->parameters_fragment; | |
222 | ||
223 | return NULL; | |
224 | } | |
225 | ||
eef85c4a | 226 | static int swap_add_device_dependencies(Swap *s) { |
61f9cf4e LP |
227 | UnitDependencyMask mask; |
228 | SwapParameters *p; | |
44b0d1fd | 229 | int r; |
61f9cf4e | 230 | |
173a8d04 LP |
231 | assert(s); |
232 | ||
233 | if (!s->what) | |
234 | return 0; | |
235 | ||
61f9cf4e | 236 | p = swap_get_parameters(s); |
d4a3494e | 237 | if (!p || !p->what) |
f10af76d LP |
238 | return 0; |
239 | ||
61f9cf4e LP |
240 | mask = s->from_proc_swaps ? UNIT_DEPENDENCY_PROC_SWAP : UNIT_DEPENDENCY_FILE; |
241 | ||
44b0d1fd LP |
242 | if (is_device_path(p->what)) { |
243 | r = unit_add_node_dependency(UNIT(s), p->what, UNIT_REQUIRES, mask); | |
244 | if (r < 0) | |
245 | return r; | |
246 | ||
247 | return unit_add_blockdev_dependency(UNIT(s), p->what, mask); | |
248 | } | |
9b88bb50 | 249 | |
61f9cf4e LP |
250 | /* File based swap devices need to be ordered after systemd-remount-fs.service, since they might need |
251 | * a writable file system. */ | |
252 | return unit_add_dependency_by_name(UNIT(s), UNIT_AFTER, SPECIAL_REMOUNT_FS_SERVICE, true, mask); | |
173a8d04 LP |
253 | } |
254 | ||
2edd4434 | 255 | static int swap_add_default_dependencies(Swap *s) { |
8bf23dc7 FB |
256 | int r; |
257 | ||
2edd4434 LP |
258 | assert(s); |
259 | ||
4c9ea260 LP |
260 | if (!UNIT(s)->default_dependencies) |
261 | return 0; | |
262 | ||
463d0d15 | 263 | if (!MANAGER_IS_SYSTEM(UNIT(s)->manager)) |
6b1dc2bd | 264 | return 0; |
2edd4434 | 265 | |
75f86906 | 266 | if (detect_container() > 0) |
c0387ebf LP |
267 | return 0; |
268 | ||
8bf23dc7 FB |
269 | /* swap units generated for the swap dev links are missing the |
270 | * ordering dep against the swap target. */ | |
35d8c19a | 271 | r = unit_add_dependency_by_name(UNIT(s), UNIT_BEFORE, SPECIAL_SWAP_TARGET, true, UNIT_DEPENDENCY_DEFAULT); |
8bf23dc7 FB |
272 | if (r < 0) |
273 | return r; | |
274 | ||
5a724170 | 275 | return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, true, UNIT_DEPENDENCY_DEFAULT); |
2edd4434 LP |
276 | } |
277 | ||
4e85aff4 | 278 | static int swap_verify(Swap *s) { |
7fd1b19b | 279 | _cleanup_free_ char *e = NULL; |
7410616c | 280 | int r; |
4e85aff4 | 281 | |
75193d41 | 282 | assert(UNIT(s)->load_state == UNIT_LOADED); |
4e85aff4 | 283 | |
7410616c LP |
284 | r = unit_name_from_path(s->what, ".swap", &e); |
285 | if (r < 0) | |
f2341e0a | 286 | return log_unit_error_errno(UNIT(s), r, "Failed to generate unit name from path: %m"); |
4e85aff4 | 287 | |
d85ff944 YW |
288 | if (!unit_has_name(UNIT(s), e)) |
289 | return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Value of What= and unit name do not match, not loading."); | |
4e85aff4 | 290 | |
d85ff944 YW |
291 | if (s->exec_context.pam_name && s->kill_context.kill_mode != KILL_CONTROL_GROUP) |
292 | 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 | 293 | |
4e85aff4 LP |
294 | return 0; |
295 | } | |
296 | ||
9670d583 | 297 | static int swap_load_devnode(Swap *s) { |
4366e598 | 298 | _cleanup_(sd_device_unrefp) sd_device *d = NULL; |
9670d583 LP |
299 | struct stat st; |
300 | const char *p; | |
e5ca27b7 | 301 | int r; |
9670d583 LP |
302 | |
303 | assert(s); | |
304 | ||
305 | if (stat(s->what, &st) < 0 || !S_ISBLK(st.st_mode)) | |
306 | return 0; | |
307 | ||
a1130022 | 308 | r = sd_device_new_from_stat_rdev(&d, &st); |
e5ca27b7 | 309 | if (r < 0) { |
8ed6f81b YW |
310 | log_unit_full_errno(UNIT(s), r == -ENOENT ? LOG_DEBUG : LOG_WARNING, r, |
311 | "Failed to allocate device for swap %s: %m", s->what); | |
9670d583 | 312 | return 0; |
e5ca27b7 | 313 | } |
9670d583 | 314 | |
4366e598 | 315 | if (sd_device_get_devname(d, &p) < 0) |
9670d583 LP |
316 | return 0; |
317 | ||
318 | return swap_set_devnode(s, p); | |
319 | } | |
320 | ||
15332d73 | 321 | static int swap_add_extras(Swap *s) { |
07b0b134 | 322 | int r; |
07b0b134 ML |
323 | |
324 | assert(s); | |
07b0b134 | 325 | |
15332d73 LP |
326 | if (UNIT(s)->fragment_path) |
327 | s->from_fragment = true; | |
07b0b134 | 328 | |
15332d73 LP |
329 | if (!s->what) { |
330 | if (s->parameters_fragment.what) | |
331 | s->what = strdup(s->parameters_fragment.what); | |
332 | else if (s->parameters_proc_swaps.what) | |
333 | s->what = strdup(s->parameters_proc_swaps.what); | |
334 | else { | |
335 | r = unit_name_to_path(UNIT(s)->id, &s->what); | |
5bcb0f2b | 336 | if (r < 0) |
4e85aff4 | 337 | return r; |
5bcb0f2b | 338 | } |
4e85aff4 | 339 | |
15332d73 LP |
340 | if (!s->what) |
341 | return -ENOMEM; | |
342 | } | |
07b0b134 | 343 | |
4ff361cc | 344 | path_simplify(s->what); |
07b0b134 | 345 | |
15332d73 LP |
346 | if (!UNIT(s)->description) { |
347 | r = unit_set_description(UNIT(s), s->what); | |
9670d583 LP |
348 | if (r < 0) |
349 | return r; | |
15332d73 | 350 | } |
9670d583 | 351 | |
15332d73 LP |
352 | r = unit_require_mounts_for(UNIT(s), s->what, UNIT_DEPENDENCY_IMPLICIT); |
353 | if (r < 0) | |
354 | return r; | |
598459ce | 355 | |
15332d73 LP |
356 | r = swap_add_device_dependencies(s); |
357 | if (r < 0) | |
358 | return r; | |
598459ce | 359 | |
15332d73 LP |
360 | r = swap_load_devnode(s); |
361 | if (r < 0) | |
362 | return r; | |
a016b922 | 363 | |
15332d73 LP |
364 | r = unit_patch_contexts(UNIT(s)); |
365 | if (r < 0) | |
366 | return r; | |
367 | ||
368 | r = unit_add_exec_dependencies(UNIT(s), &s->exec_context); | |
369 | if (r < 0) | |
370 | return r; | |
371 | ||
372 | r = unit_set_default_slice(UNIT(s)); | |
373 | if (r < 0) | |
374 | return r; | |
375 | ||
376 | r = swap_add_default_dependencies(s); | |
377 | if (r < 0) | |
378 | return r; | |
379 | ||
380 | return 0; | |
381 | } | |
382 | ||
383 | static int swap_load(Unit *u) { | |
384 | Swap *s = SWAP(u); | |
75193d41 | 385 | int r, q = 0; |
15332d73 LP |
386 | |
387 | assert(s); | |
388 | assert(u->load_state == UNIT_STUB); | |
389 | ||
390 | /* Load a .swap file */ | |
c3620770 ZJS |
391 | bool fragment_optional = s->from_proc_swaps; |
392 | r = unit_load_fragment_and_dropin(u, !fragment_optional); | |
15332d73 | 393 | |
75193d41 ZJS |
394 | /* Add in some extras, and do so either when we successfully loaded something or when /proc/swaps is |
395 | * already active. */ | |
06721f39 LP |
396 | if (u->load_state == UNIT_LOADED || s->from_proc_swaps) |
397 | q = swap_add_extras(s); | |
15332d73 | 398 | |
06721f39 LP |
399 | if (r < 0) |
400 | return r; | |
401 | if (q < 0) | |
402 | return q; | |
75193d41 ZJS |
403 | if (u->load_state != UNIT_LOADED) |
404 | return 0; | |
07b0b134 ML |
405 | |
406 | return swap_verify(s); | |
407 | } | |
408 | ||
628c89cc | 409 | static int swap_setup_unit( |
4e85aff4 LP |
410 | Manager *m, |
411 | const char *what, | |
e04aad61 | 412 | const char *what_proc_swaps, |
4e85aff4 | 413 | int priority, |
e04aad61 LP |
414 | bool set_flags) { |
415 | ||
7fd1b19b | 416 | _cleanup_free_ char *e = NULL; |
2c7c6144 | 417 | bool delete = false; |
5bcb0f2b | 418 | Unit *u = NULL; |
07b0b134 | 419 | int r; |
4e85aff4 LP |
420 | SwapParameters *p; |
421 | ||
422 | assert(m); | |
423 | assert(what); | |
6b1dc2bd | 424 | assert(what_proc_swaps); |
07b0b134 | 425 | |
7410616c LP |
426 | r = unit_name_from_path(what, ".swap", &e); |
427 | if (r < 0) | |
f2341e0a | 428 | return log_unit_error_errno(u, r, "Failed to generate unit name from path: %m"); |
07b0b134 | 429 | |
e04aad61 | 430 | u = manager_get_unit(m, e); |
6b1dc2bd | 431 | if (u && |
e04aad61 | 432 | SWAP(u)->from_proc_swaps && |
baaa35ad ZJS |
433 | !path_equal(SWAP(u)->parameters_proc_swaps.what, what_proc_swaps)) |
434 | return log_error_errno(SYNTHETIC_ERRNO(EEXIST), | |
435 | "Swap %s appeared twice with different device paths %s and %s", | |
436 | e, SWAP(u)->parameters_proc_swaps.what, what_proc_swaps); | |
4e85aff4 LP |
437 | |
438 | if (!u) { | |
07b0b134 ML |
439 | delete = true; |
440 | ||
a581e45a | 441 | r = unit_new_for_name(m, sizeof(Swap), e, &u); |
7d17cfbc | 442 | if (r < 0) |
e04aad61 LP |
443 | goto fail; |
444 | ||
7d17cfbc MS |
445 | SWAP(u)->what = strdup(what); |
446 | if (!SWAP(u)->what) { | |
628c89cc | 447 | r = -ENOMEM; |
e04aad61 LP |
448 | goto fail; |
449 | } | |
450 | ||
451 | unit_add_to_load_queue(u); | |
4e85aff4 LP |
452 | } else |
453 | delete = false; | |
07b0b134 | 454 | |
6b1dc2bd | 455 | p = &SWAP(u)->parameters_proc_swaps; |
07b0b134 | 456 | |
6b1dc2bd | 457 | if (!p->what) { |
5bcb0f2b LP |
458 | p->what = strdup(what_proc_swaps); |
459 | if (!p->what) { | |
460 | r = -ENOMEM; | |
6b1dc2bd LP |
461 | goto fail; |
462 | } | |
6b1dc2bd | 463 | } |
e04aad61 | 464 | |
46f94480 LP |
465 | /* The unit is definitely around now, mark it as loaded if it was previously referenced but could not be |
466 | * loaded. After all we can load it now, from the data in /proc/swaps. */ | |
467 | if (IN_SET(u->load_state, UNIT_NOT_FOUND, UNIT_BAD_SETTING, UNIT_ERROR)) { | |
468 | u->load_state = UNIT_LOADED; | |
469 | u->load_error = 0; | |
470 | } | |
471 | ||
6b1dc2bd LP |
472 | if (set_flags) { |
473 | SWAP(u)->is_active = true; | |
474 | SWAP(u)->just_activated = !SWAP(u)->from_proc_swaps; | |
4e85aff4 | 475 | } |
07b0b134 | 476 | |
6b1dc2bd LP |
477 | SWAP(u)->from_proc_swaps = true; |
478 | ||
4e85aff4 | 479 | p->priority = priority; |
7477451b | 480 | p->priority_set = true; |
07b0b134 | 481 | |
4e85aff4 | 482 | unit_add_to_dbus_queue(u); |
07b0b134 ML |
483 | return 0; |
484 | ||
485 | fail: | |
f2341e0a | 486 | log_unit_warning_errno(u, r, "Failed to load swap unit: %m"); |
e04aad61 | 487 | |
c9d5c9c0 | 488 | if (delete) |
07b0b134 ML |
489 | unit_free(u); |
490 | ||
4e85aff4 | 491 | return r; |
07b0b134 ML |
492 | } |
493 | ||
6aeb8c89 | 494 | static void swap_process_new(Manager *m, const char *device, int prio, bool set_flags) { |
4366e598 YW |
495 | _cleanup_(sd_device_unrefp) sd_device *d = NULL; |
496 | const char *dn, *devlink; | |
497 | struct stat st, st_link; | |
5bcb0f2b | 498 | int r; |
e04aad61 LP |
499 | |
500 | assert(m); | |
501 | ||
6aeb8c89 LP |
502 | if (swap_setup_unit(m, device, device, prio, set_flags) < 0) |
503 | return; | |
e04aad61 | 504 | |
5bcb0f2b LP |
505 | /* If this is a block device, then let's add duplicates for |
506 | * all other names of this block device */ | |
507 | if (stat(device, &st) < 0 || !S_ISBLK(st.st_mode)) | |
6aeb8c89 | 508 | return; |
e04aad61 | 509 | |
a1130022 | 510 | r = sd_device_new_from_stat_rdev(&d, &st); |
6aeb8c89 LP |
511 | if (r < 0) |
512 | return (void) log_full_errno(r == -ENOENT ? LOG_DEBUG : LOG_WARNING, r, | |
513 | "Failed to allocate device for swap %s: %m", device); | |
e04aad61 | 514 | |
5bcb0f2b | 515 | /* Add the main device node */ |
4366e598 | 516 | if (sd_device_get_devname(d, &dn) >= 0 && !streq(dn, device)) |
6aeb8c89 | 517 | (void) swap_setup_unit(m, dn, device, prio, set_flags); |
e04aad61 | 518 | |
5bcb0f2b | 519 | /* Add additional units for all symlinks */ |
4366e598 | 520 | FOREACH_DEVICE_DEVLINK(d, devlink) { |
e04aad61 | 521 | |
5bcb0f2b | 522 | /* Don't bother with the /dev/block links */ |
4366e598 | 523 | if (streq(devlink, device)) |
5bcb0f2b | 524 | continue; |
e04aad61 | 525 | |
4366e598 | 526 | if (path_startswith(devlink, "/dev/block/")) |
5bcb0f2b | 527 | continue; |
e04aad61 | 528 | |
4366e598 YW |
529 | if (stat(devlink, &st_link) >= 0 && |
530 | (!S_ISBLK(st_link.st_mode) || | |
531 | st_link.st_rdev != st.st_rdev)) | |
532 | continue; | |
e04aad61 | 533 | |
6aeb8c89 | 534 | (void) swap_setup_unit(m, devlink, device, prio, set_flags); |
e04aad61 | 535 | } |
e04aad61 LP |
536 | } |
537 | ||
07b0b134 ML |
538 | static void swap_set_state(Swap *s, SwapState state) { |
539 | SwapState old_state; | |
e04aad61 | 540 | |
07b0b134 ML |
541 | assert(s); |
542 | ||
6fcbec6f LP |
543 | if (s->state != state) |
544 | bus_unit_send_pending_change_signal(UNIT(s), false); | |
545 | ||
07b0b134 ML |
546 | old_state = s->state; |
547 | s->state = state; | |
548 | ||
dedf3719 | 549 | if (!SWAP_STATE_WITH_PROCESS(state)) { |
5dcadb4c | 550 | s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source); |
e04aad61 LP |
551 | swap_unwatch_control_pid(s); |
552 | s->control_command = NULL; | |
553 | s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; | |
554 | } | |
555 | ||
07b0b134 | 556 | if (state != old_state) |
f2341e0a | 557 | log_unit_debug(UNIT(s), "Changed %s -> %s", swap_state_to_string(old_state), swap_state_to_string(state)); |
07b0b134 | 558 | |
2ad2e41a | 559 | unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], 0); |
37cf8fee LP |
560 | |
561 | /* If there other units for the same device node have a job | |
562 | queued it might be worth checking again if it is runnable | |
563 | now. This is necessary, since swap_start() refuses | |
564 | operation with EAGAIN if there's already another job for | |
565 | the same device node queued. */ | |
566 | LIST_FOREACH_OTHERS(same_devnode, other, s) | |
567 | if (UNIT(other)->job) | |
568 | job_add_to_run_queue(UNIT(other)->job); | |
07b0b134 ML |
569 | } |
570 | ||
be847e82 | 571 | static int swap_coldplug(Unit *u) { |
07b0b134 ML |
572 | Swap *s = SWAP(u); |
573 | SwapState new_state = SWAP_DEAD; | |
e04aad61 | 574 | int r; |
07b0b134 ML |
575 | |
576 | assert(s); | |
577 | assert(s->state == SWAP_DEAD); | |
578 | ||
579 | if (s->deserialized_state != s->state) | |
580 | new_state = s->deserialized_state; | |
4e85aff4 | 581 | else if (s->from_proc_swaps) |
07b0b134 ML |
582 | new_state = SWAP_ACTIVE; |
583 | ||
5bcb0f2b LP |
584 | if (new_state == s->state) |
585 | return 0; | |
e04aad61 | 586 | |
c386f588 LP |
587 | if (s->control_pid > 0 && |
588 | pid_is_unwaited(s->control_pid) && | |
dedf3719 | 589 | SWAP_STATE_WITH_PROCESS(new_state)) { |
e04aad61 | 590 | |
f75f613d | 591 | r = unit_watch_pid(UNIT(s), s->control_pid, false); |
5bcb0f2b LP |
592 | if (r < 0) |
593 | return r; | |
e04aad61 | 594 | |
36c16a7c | 595 | r = swap_arm_timer(s, usec_add(u->state_change_timestamp.monotonic, s->timeout_usec)); |
5bcb0f2b LP |
596 | if (r < 0) |
597 | return r; | |
e04aad61 | 598 | } |
07b0b134 | 599 | |
e8a565cb | 600 | if (!IN_SET(new_state, SWAP_DEAD, SWAP_FAILED)) { |
29206d46 | 601 | (void) unit_setup_dynamic_creds(u); |
e8a565cb YW |
602 | (void) unit_setup_exec_runtime(u); |
603 | } | |
29206d46 | 604 | |
5bcb0f2b | 605 | swap_set_state(s, new_state); |
07b0b134 ML |
606 | return 0; |
607 | } | |
608 | ||
609 | static void swap_dump(Unit *u, FILE *f, const char *prefix) { | |
610 | Swap *s = SWAP(u); | |
4e85aff4 | 611 | SwapParameters *p; |
07b0b134 ML |
612 | |
613 | assert(s); | |
4e85aff4 LP |
614 | assert(f); |
615 | ||
616 | if (s->from_proc_swaps) | |
617 | p = &s->parameters_proc_swaps; | |
618 | else if (s->from_fragment) | |
619 | p = &s->parameters_fragment; | |
b6bfc7bb LP |
620 | else |
621 | p = NULL; | |
07b0b134 ML |
622 | |
623 | fprintf(f, | |
4e85aff4 | 624 | "%sSwap State: %s\n" |
e1770af8 | 625 | "%sResult: %s\n" |
a8b689b7 | 626 | "%sClean Result: %s\n" |
07b0b134 | 627 | "%sWhat: %s\n" |
4e85aff4 | 628 | "%sFrom /proc/swaps: %s\n" |
39c79477 ZJS |
629 | "%sFrom fragment: %s\n" |
630 | "%sExtrinsic: %s\n", | |
07b0b134 | 631 | prefix, swap_state_to_string(s->state), |
e1770af8 | 632 | prefix, swap_result_to_string(s->result), |
a8b689b7 | 633 | prefix, swap_result_to_string(s->clean_result), |
07b0b134 | 634 | prefix, s->what, |
4e85aff4 | 635 | prefix, yes_no(s->from_proc_swaps), |
39c79477 ZJS |
636 | prefix, yes_no(s->from_fragment), |
637 | prefix, yes_no(swap_is_extrinsic(u))); | |
e04aad61 | 638 | |
9670d583 LP |
639 | if (s->devnode) |
640 | fprintf(f, "%sDevice Node: %s\n", prefix, s->devnode); | |
641 | ||
b6bfc7bb LP |
642 | if (p) |
643 | fprintf(f, | |
644 | "%sPriority: %i\n" | |
47cb901e | 645 | "%sOptions: %s\n", |
b6bfc7bb | 646 | prefix, p->priority, |
47cb901e | 647 | prefix, strempty(p->options)); |
b6bfc7bb | 648 | |
9bd0e1b8 YW |
649 | fprintf(f, |
650 | "%sTimeoutSec: %s\n", | |
5291f26d | 651 | prefix, FORMAT_TIMESPAN(s->timeout_usec, USEC_PER_SEC)); |
9bd0e1b8 | 652 | |
e04aad61 LP |
653 | if (s->control_pid > 0) |
654 | fprintf(f, | |
de0671ee ZJS |
655 | "%sControl PID: "PID_FMT"\n", |
656 | prefix, s->control_pid); | |
e04aad61 LP |
657 | |
658 | exec_context_dump(&s->exec_context, f, prefix); | |
4819ff03 | 659 | kill_context_dump(&s->kill_context, f, prefix); |
bc0623df | 660 | cgroup_context_dump(UNIT(s), f, prefix); |
e04aad61 LP |
661 | } |
662 | ||
663 | static int swap_spawn(Swap *s, ExecCommand *c, pid_t *_pid) { | |
3c7416b6 | 664 | |
b9c04eaf | 665 | _cleanup_(exec_params_clear) ExecParameters exec_params = { |
1703fa41 | 666 | .flags = EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN, |
c39f1ce2 LP |
667 | .stdin_fd = -1, |
668 | .stdout_fd = -1, | |
669 | .stderr_fd = -1, | |
5686391b | 670 | .exec_fd = -1, |
9fa95f85 | 671 | }; |
3c7416b6 LP |
672 | pid_t pid; |
673 | int r; | |
e04aad61 LP |
674 | |
675 | assert(s); | |
676 | assert(c); | |
677 | assert(_pid); | |
678 | ||
3c7416b6 | 679 | r = unit_prepare_exec(UNIT(s)); |
29206d46 | 680 | if (r < 0) |
3c7416b6 | 681 | return r; |
29206d46 | 682 | |
36c16a7c | 683 | r = swap_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec)); |
646134dc | 684 | if (r < 0) |
e04aad61 LP |
685 | goto fail; |
686 | ||
1ad6e8b3 LP |
687 | r = unit_set_exec_params(UNIT(s), &exec_params); |
688 | if (r < 0) | |
689 | goto fail; | |
9fa95f85 | 690 | |
f2341e0a LP |
691 | r = exec_spawn(UNIT(s), |
692 | c, | |
646134dc | 693 | &s->exec_context, |
9fa95f85 | 694 | &exec_params, |
613b411c | 695 | s->exec_runtime, |
29206d46 | 696 | &s->dynamic_creds, |
646134dc ZJS |
697 | &pid); |
698 | if (r < 0) | |
e04aad61 LP |
699 | goto fail; |
700 | ||
f75f613d | 701 | r = unit_watch_pid(UNIT(s), pid, true); |
646134dc | 702 | if (r < 0) |
e04aad61 LP |
703 | goto fail; |
704 | ||
705 | *_pid = pid; | |
706 | ||
707 | return 0; | |
708 | ||
709 | fail: | |
5dcadb4c | 710 | s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source); |
3536f49e | 711 | |
e04aad61 | 712 | return r; |
07b0b134 ML |
713 | } |
714 | ||
e1770af8 | 715 | static void swap_enter_dead(Swap *s, SwapResult f) { |
07b0b134 ML |
716 | assert(s); |
717 | ||
a0fef983 | 718 | if (s->result == SWAP_SUCCESS) |
e1770af8 | 719 | s->result = f; |
e04aad61 | 720 | |
aac99f30 | 721 | unit_log_result(UNIT(s), s->result == SWAP_SUCCESS, swap_result_to_string(s->result)); |
4c425434 | 722 | unit_warn_leftover_processes(UNIT(s), unit_log_leftover_process_stop); |
29206d46 LP |
723 | swap_set_state(s, s->result != SWAP_SUCCESS ? SWAP_FAILED : SWAP_DEAD); |
724 | ||
e8a565cb | 725 | s->exec_runtime = exec_runtime_unref(s->exec_runtime, true); |
613b411c | 726 | |
bb0c0d6f | 727 | unit_destroy_runtime_data(UNIT(s), &s->exec_context); |
e66cf1a3 | 728 | |
00d9ef85 LP |
729 | unit_unref_uid_gid(UNIT(s), true); |
730 | ||
29206d46 | 731 | dynamic_creds_destroy(&s->dynamic_creds); |
07b0b134 ML |
732 | } |
733 | ||
e1770af8 | 734 | static void swap_enter_active(Swap *s, SwapResult f) { |
e04aad61 LP |
735 | assert(s); |
736 | ||
a0fef983 | 737 | if (s->result == SWAP_SUCCESS) |
e1770af8 | 738 | s->result = f; |
e04aad61 LP |
739 | |
740 | swap_set_state(s, SWAP_ACTIVE); | |
741 | } | |
742 | ||
50864457 LP |
743 | static void swap_enter_dead_or_active(Swap *s, SwapResult f) { |
744 | assert(s); | |
745 | ||
9c1f969d | 746 | if (s->from_proc_swaps) { |
50864457 | 747 | swap_enter_active(s, f); |
9c1f969d HD |
748 | |
749 | LIST_FOREACH_OTHERS(same_devnode, other, s) | |
750 | if (UNIT(other)->job) | |
751 | swap_enter_dead_or_active(other, f); | |
752 | } else | |
50864457 LP |
753 | swap_enter_dead(s, f); |
754 | } | |
755 | ||
a232ebcc ZJS |
756 | static int state_to_kill_operation(Swap *s, SwapState state) { |
757 | if (state == SWAP_DEACTIVATING_SIGTERM) { | |
758 | if (unit_has_job_type(UNIT(s), JOB_RESTART)) | |
759 | return KILL_RESTART; | |
760 | else | |
761 | return KILL_TERMINATE; | |
762 | } | |
763 | ||
764 | return KILL_KILL; | |
765 | } | |
766 | ||
e1770af8 | 767 | static void swap_enter_signal(Swap *s, SwapState state, SwapResult f) { |
07b0b134 ML |
768 | int r; |
769 | ||
770 | assert(s); | |
e04aad61 | 771 | |
a0fef983 | 772 | if (s->result == SWAP_SUCCESS) |
e1770af8 | 773 | s->result = f; |
e04aad61 | 774 | |
a232ebcc ZJS |
775 | r = unit_kill_context(UNIT(s), |
776 | &s->kill_context, | |
777 | state_to_kill_operation(s, state), | |
778 | -1, | |
779 | s->control_pid, | |
780 | false); | |
cd2086fe LP |
781 | if (r < 0) |
782 | goto fail; | |
e04aad61 | 783 | |
cd2086fe | 784 | if (r > 0) { |
36c16a7c | 785 | r = swap_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec)); |
646134dc | 786 | if (r < 0) |
e04aad61 LP |
787 | goto fail; |
788 | ||
789 | swap_set_state(s, state); | |
50864457 | 790 | } else if (state == SWAP_DEACTIVATING_SIGTERM && s->kill_context.send_sigkill) |
ac84d1fb LP |
791 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, SWAP_SUCCESS); |
792 | else | |
50864457 | 793 | swap_enter_dead_or_active(s, SWAP_SUCCESS); |
e04aad61 LP |
794 | |
795 | return; | |
796 | ||
797 | fail: | |
f2341e0a | 798 | log_unit_warning_errno(UNIT(s), r, "Failed to kill processes: %m"); |
50864457 | 799 | swap_enter_dead_or_active(s, SWAP_FAILURE_RESOURCES); |
e04aad61 LP |
800 | } |
801 | ||
802 | static void swap_enter_activating(Swap *s) { | |
bf1d7ba7 KZ |
803 | _cleanup_free_ char *opts = NULL; |
804 | int r; | |
e04aad61 LP |
805 | |
806 | assert(s); | |
807 | ||
4c425434 | 808 | unit_warn_leftover_processes(UNIT(s), unit_log_leftover_process_start); |
a4634b21 | 809 | |
e04aad61 LP |
810 | s->control_command_id = SWAP_EXEC_ACTIVATE; |
811 | s->control_command = s->exec_command + SWAP_EXEC_ACTIVATE; | |
07b0b134 | 812 | |
86b23b07 | 813 | if (s->from_fragment) { |
7477451b | 814 | int priority = 0; |
47cb901e | 815 | |
bf1d7ba7 KZ |
816 | r = fstab_find_pri(s->parameters_fragment.options, &priority); |
817 | if (r < 0) | |
af4454cb LP |
818 | log_unit_warning_errno(UNIT(s), r, "Failed to parse swap priority \"%s\", ignoring: %m", s->parameters_fragment.options); |
819 | else if (r > 0 && s->parameters_fragment.priority_set) | |
820 | log_unit_warning(UNIT(s), "Duplicate swap priority configuration by Priority= and Options= fields."); | |
bf1d7ba7 | 821 | |
7477451b | 822 | if (r <= 0 && s->parameters_fragment.priority_set) { |
bf1d7ba7 KZ |
823 | if (s->parameters_fragment.options) |
824 | r = asprintf(&opts, "%s,pri=%i", s->parameters_fragment.options, s->parameters_fragment.priority); | |
825 | else | |
826 | r = asprintf(&opts, "pri=%i", s->parameters_fragment.priority); | |
6fca66a7 LP |
827 | if (r < 0) { |
828 | r = -ENOMEM; | |
bf1d7ba7 | 829 | goto fail; |
6fca66a7 | 830 | } |
e64d5235 | 831 | } |
86b23b07 JS |
832 | } |
833 | ||
834 | r = exec_command_set(s->control_command, "/sbin/swapon", NULL); | |
835 | if (r < 0) | |
836 | goto fail; | |
4e85aff4 | 837 | |
bf1d7ba7 KZ |
838 | if (s->parameters_fragment.options || opts) { |
839 | r = exec_command_append(s->control_command, "-o", | |
af4454cb | 840 | opts ?: s->parameters_fragment.options, NULL); |
86b23b07 JS |
841 | if (r < 0) |
842 | goto fail; | |
843 | } | |
e04aad61 | 844 | |
86b23b07 | 845 | r = exec_command_append(s->control_command, s->what, NULL); |
e04aad61 LP |
846 | if (r < 0) |
847 | goto fail; | |
848 | ||
849 | swap_unwatch_control_pid(s); | |
850 | ||
646134dc ZJS |
851 | r = swap_spawn(s, s->control_command, &s->control_pid); |
852 | if (r < 0) | |
e04aad61 LP |
853 | goto fail; |
854 | ||
855 | swap_set_state(s, SWAP_ACTIVATING); | |
e04aad61 LP |
856 | return; |
857 | ||
858 | fail: | |
f2341e0a | 859 | log_unit_warning_errno(UNIT(s), r, "Failed to run 'swapon' task: %m"); |
50864457 | 860 | swap_enter_dead_or_active(s, SWAP_FAILURE_RESOURCES); |
e04aad61 LP |
861 | } |
862 | ||
e1770af8 | 863 | static void swap_enter_deactivating(Swap *s) { |
e04aad61 LP |
864 | int r; |
865 | ||
866 | assert(s); | |
867 | ||
e04aad61 LP |
868 | s->control_command_id = SWAP_EXEC_DEACTIVATE; |
869 | s->control_command = s->exec_command + SWAP_EXEC_DEACTIVATE; | |
870 | ||
646134dc | 871 | r = exec_command_set(s->control_command, |
e04aad61 LP |
872 | "/sbin/swapoff", |
873 | s->what, | |
646134dc ZJS |
874 | NULL); |
875 | if (r < 0) | |
e04aad61 LP |
876 | goto fail; |
877 | ||
878 | swap_unwatch_control_pid(s); | |
879 | ||
646134dc ZJS |
880 | r = swap_spawn(s, s->control_command, &s->control_pid); |
881 | if (r < 0) | |
e04aad61 LP |
882 | goto fail; |
883 | ||
884 | swap_set_state(s, SWAP_DEACTIVATING); | |
885 | ||
886 | return; | |
887 | ||
888 | fail: | |
f2341e0a | 889 | log_unit_warning_errno(UNIT(s), r, "Failed to run 'swapoff' task: %m"); |
50864457 | 890 | swap_enter_dead_or_active(s, SWAP_FAILURE_RESOURCES); |
e04aad61 LP |
891 | } |
892 | ||
31135818 LP |
893 | static void swap_cycle_clear(Swap *s) { |
894 | assert(s); | |
895 | ||
896 | s->result = SWAP_SUCCESS; | |
897 | exec_command_reset_status_array(s->exec_command, _SWAP_EXEC_COMMAND_MAX); | |
898 | UNIT(s)->reset_accounting = true; | |
899 | } | |
900 | ||
e04aad61 | 901 | static int swap_start(Unit *u) { |
03677889 | 902 | Swap *s = SWAP(u); |
07299350 | 903 | int r; |
e04aad61 LP |
904 | |
905 | assert(s); | |
906 | ||
50864457 | 907 | /* We cannot fulfill this request right now, try again later please! */ |
d31ae548 FB |
908 | if (IN_SET(s->state, |
909 | SWAP_DEACTIVATING, | |
910 | SWAP_DEACTIVATING_SIGTERM, | |
a8b689b7 YW |
911 | SWAP_DEACTIVATING_SIGKILL, |
912 | SWAP_CLEANING)) | |
e04aad61 LP |
913 | return -EAGAIN; |
914 | ||
50864457 | 915 | /* Already on it! */ |
e04aad61 LP |
916 | if (s->state == SWAP_ACTIVATING) |
917 | return 0; | |
918 | ||
d31ae548 | 919 | assert(IN_SET(s->state, SWAP_DEAD, SWAP_FAILED)); |
e04aad61 | 920 | |
75f86906 | 921 | if (detect_container() > 0) |
a5c3034f LP |
922 | return -EPERM; |
923 | ||
37cf8fee LP |
924 | /* If there's a job for another swap unit for the same node |
925 | * running, then let's not dispatch this one for now, and wait | |
926 | * until that other job has finished. */ | |
927 | LIST_FOREACH_OTHERS(same_devnode, other, s) | |
928 | if (UNIT(other)->job && UNIT(other)->job->state == JOB_RUNNING) | |
929 | return -EAGAIN; | |
930 | ||
4b58153d LP |
931 | r = unit_acquire_invocation_id(u); |
932 | if (r < 0) | |
933 | return r; | |
934 | ||
31135818 | 935 | swap_cycle_clear(s); |
e04aad61 | 936 | swap_enter_activating(s); |
82a2b6bb | 937 | return 1; |
07b0b134 ML |
938 | } |
939 | ||
940 | static int swap_stop(Unit *u) { | |
941 | Swap *s = SWAP(u); | |
07b0b134 ML |
942 | |
943 | assert(s); | |
944 | ||
50864457 LP |
945 | switch (s->state) { |
946 | ||
947 | case SWAP_DEACTIVATING: | |
948 | case SWAP_DEACTIVATING_SIGTERM: | |
949 | case SWAP_DEACTIVATING_SIGKILL: | |
950 | /* Already on it */ | |
e04aad61 | 951 | return 0; |
07b0b134 | 952 | |
50864457 LP |
953 | case SWAP_ACTIVATING: |
954 | case SWAP_ACTIVATING_DONE: | |
955 | /* There's a control process pending, directly enter kill mode */ | |
956 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGTERM, SWAP_SUCCESS); | |
957 | return 0; | |
07b0b134 | 958 | |
50864457 LP |
959 | case SWAP_ACTIVE: |
960 | if (detect_container() > 0) | |
961 | return -EPERM; | |
a5c3034f | 962 | |
50864457 LP |
963 | swap_enter_deactivating(s); |
964 | return 1; | |
965 | ||
a8b689b7 YW |
966 | case SWAP_CLEANING: |
967 | /* If we are currently cleaning, then abort it, brutally. */ | |
968 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, SWAP_SUCCESS); | |
969 | return 0; | |
970 | ||
50864457 | 971 | default: |
04499a70 | 972 | assert_not_reached(); |
50864457 | 973 | } |
07b0b134 ML |
974 | } |
975 | ||
976 | static int swap_serialize(Unit *u, FILE *f, FDSet *fds) { | |
977 | Swap *s = SWAP(u); | |
978 | ||
979 | assert(s); | |
980 | assert(f); | |
981 | assert(fds); | |
982 | ||
d68c645b LP |
983 | (void) serialize_item(f, "state", swap_state_to_string(s->state)); |
984 | (void) serialize_item(f, "result", swap_result_to_string(s->result)); | |
e04aad61 LP |
985 | |
986 | if (s->control_pid > 0) | |
d68c645b | 987 | (void) serialize_item_format(f, "control-pid", PID_FMT, s->control_pid); |
e04aad61 LP |
988 | |
989 | if (s->control_command_id >= 0) | |
d68c645b | 990 | (void) serialize_item(f, "control-command", swap_exec_command_to_string(s->control_command_id)); |
07b0b134 ML |
991 | |
992 | return 0; | |
993 | } | |
994 | ||
995 | static int swap_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
996 | Swap *s = SWAP(u); | |
997 | ||
998 | assert(s); | |
999 | assert(fds); | |
1000 | ||
1001 | if (streq(key, "state")) { | |
1002 | SwapState state; | |
1003 | ||
646134dc ZJS |
1004 | state = swap_state_from_string(value); |
1005 | if (state < 0) | |
f2341e0a | 1006 | log_unit_debug(u, "Failed to parse state value: %s", value); |
07b0b134 ML |
1007 | else |
1008 | s->deserialized_state = state; | |
e1770af8 LP |
1009 | } else if (streq(key, "result")) { |
1010 | SwapResult f; | |
1011 | ||
1012 | f = swap_result_from_string(value); | |
1013 | if (f < 0) | |
f2341e0a | 1014 | log_unit_debug(u, "Failed to parse result value: %s", value); |
e1770af8 LP |
1015 | else if (f != SWAP_SUCCESS) |
1016 | s->result = f; | |
e04aad61 LP |
1017 | } else if (streq(key, "control-pid")) { |
1018 | pid_t pid; | |
1019 | ||
1020 | if (parse_pid(value, &pid) < 0) | |
f2341e0a | 1021 | log_unit_debug(u, "Failed to parse control-pid value: %s", value); |
e04aad61 LP |
1022 | else |
1023 | s->control_pid = pid; | |
1024 | ||
1025 | } else if (streq(key, "control-command")) { | |
1026 | SwapExecCommand id; | |
1027 | ||
646134dc ZJS |
1028 | id = swap_exec_command_from_string(value); |
1029 | if (id < 0) | |
f2341e0a | 1030 | log_unit_debug(u, "Failed to parse exec-command value: %s", value); |
e04aad61 LP |
1031 | else { |
1032 | s->control_command_id = id; | |
1033 | s->control_command = s->exec_command + id; | |
1034 | } | |
07b0b134 | 1035 | } else |
f2341e0a | 1036 | log_unit_debug(u, "Unknown serialization key: %s", key); |
07b0b134 ML |
1037 | |
1038 | return 0; | |
1039 | } | |
1040 | ||
e04aad61 LP |
1041 | static void swap_sigchld_event(Unit *u, pid_t pid, int code, int status) { |
1042 | Swap *s = SWAP(u); | |
e1770af8 | 1043 | SwapResult f; |
e04aad61 LP |
1044 | |
1045 | assert(s); | |
1046 | assert(pid >= 0); | |
1047 | ||
1048 | if (pid != s->control_pid) | |
1049 | return; | |
1050 | ||
bcce581d LP |
1051 | /* Let's scan /proc/swaps before we process SIGCHLD. For the reasoning see the similar code in |
1052 | * mount.c */ | |
1053 | (void) swap_process_proc_swaps(u->manager); | |
1054 | ||
e04aad61 LP |
1055 | s->control_pid = 0; |
1056 | ||
1f0958f6 | 1057 | if (is_clean_exit(code, status, EXIT_CLEAN_COMMAND, NULL)) |
e1770af8 LP |
1058 | f = SWAP_SUCCESS; |
1059 | else if (code == CLD_EXITED) | |
1060 | f = SWAP_FAILURE_EXIT_CODE; | |
1061 | else if (code == CLD_KILLED) | |
1062 | f = SWAP_FAILURE_SIGNAL; | |
1063 | else if (code == CLD_DUMPED) | |
1064 | f = SWAP_FAILURE_CORE_DUMP; | |
1065 | else | |
04499a70 | 1066 | assert_not_reached(); |
e1770af8 | 1067 | |
a0fef983 | 1068 | if (s->result == SWAP_SUCCESS) |
e1770af8 | 1069 | s->result = f; |
e04aad61 LP |
1070 | |
1071 | if (s->control_command) { | |
6ea832a2 | 1072 | exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status); |
e1770af8 | 1073 | |
e04aad61 LP |
1074 | s->control_command = NULL; |
1075 | s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; | |
1076 | } | |
1077 | ||
91bbd9b7 | 1078 | unit_log_process_exit( |
5cc2cd1c | 1079 | u, |
91bbd9b7 LP |
1080 | "Swap process", |
1081 | swap_exec_command_to_string(s->control_command_id), | |
5cc2cd1c | 1082 | f == SWAP_SUCCESS, |
91bbd9b7 | 1083 | code, status); |
e04aad61 LP |
1084 | |
1085 | switch (s->state) { | |
1086 | ||
1087 | case SWAP_ACTIVATING: | |
5bcb0f2b | 1088 | case SWAP_ACTIVATING_DONE: |
e04aad61 | 1089 | |
50864457 | 1090 | if (f == SWAP_SUCCESS || s->from_proc_swaps) |
e1770af8 | 1091 | swap_enter_active(s, f); |
e04aad61 | 1092 | else |
e1770af8 | 1093 | swap_enter_dead(s, f); |
e04aad61 LP |
1094 | break; |
1095 | ||
1096 | case SWAP_DEACTIVATING: | |
1097 | case SWAP_DEACTIVATING_SIGKILL: | |
1098 | case SWAP_DEACTIVATING_SIGTERM: | |
1099 | ||
50864457 | 1100 | swap_enter_dead_or_active(s, f); |
e04aad61 LP |
1101 | break; |
1102 | ||
a8b689b7 YW |
1103 | case SWAP_CLEANING: |
1104 | if (s->clean_result == SWAP_SUCCESS) | |
1105 | s->clean_result = f; | |
1106 | ||
1107 | swap_enter_dead(s, SWAP_SUCCESS); | |
1108 | break; | |
1109 | ||
e04aad61 | 1110 | default: |
04499a70 | 1111 | assert_not_reached(); |
e04aad61 LP |
1112 | } |
1113 | ||
1114 | /* Notify clients about changed exit status */ | |
1115 | unit_add_to_dbus_queue(u); | |
e04aad61 LP |
1116 | } |
1117 | ||
718db961 LP |
1118 | static int swap_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) { |
1119 | Swap *s = SWAP(userdata); | |
e04aad61 LP |
1120 | |
1121 | assert(s); | |
718db961 | 1122 | assert(s->timer_event_source == source); |
e04aad61 LP |
1123 | |
1124 | switch (s->state) { | |
1125 | ||
1126 | case SWAP_ACTIVATING: | |
5bcb0f2b | 1127 | case SWAP_ACTIVATING_DONE: |
f2341e0a | 1128 | log_unit_warning(UNIT(s), "Activation timed out. Stopping."); |
50864457 | 1129 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT); |
e04aad61 LP |
1130 | break; |
1131 | ||
1132 | case SWAP_DEACTIVATING: | |
f2341e0a | 1133 | log_unit_warning(UNIT(s), "Deactivation timed out. Stopping."); |
e1770af8 | 1134 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT); |
e04aad61 LP |
1135 | break; |
1136 | ||
e04aad61 | 1137 | case SWAP_DEACTIVATING_SIGTERM: |
4819ff03 | 1138 | if (s->kill_context.send_sigkill) { |
50864457 | 1139 | log_unit_warning(UNIT(s), "Swap process timed out. Killing."); |
e1770af8 | 1140 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, SWAP_FAILURE_TIMEOUT); |
ba035df2 | 1141 | } else { |
50864457 LP |
1142 | log_unit_warning(UNIT(s), "Swap process timed out. Skipping SIGKILL. Ignoring."); |
1143 | swap_enter_dead_or_active(s, SWAP_FAILURE_TIMEOUT); | |
ba035df2 | 1144 | } |
e04aad61 LP |
1145 | break; |
1146 | ||
e04aad61 | 1147 | case SWAP_DEACTIVATING_SIGKILL: |
f2341e0a | 1148 | log_unit_warning(UNIT(s), "Swap process still around after SIGKILL. Ignoring."); |
50864457 | 1149 | swap_enter_dead_or_active(s, SWAP_FAILURE_TIMEOUT); |
e04aad61 LP |
1150 | break; |
1151 | ||
a8b689b7 YW |
1152 | case SWAP_CLEANING: |
1153 | log_unit_warning(UNIT(s), "Cleaning timed out. killing."); | |
1154 | ||
1155 | if (s->clean_result == SWAP_SUCCESS) | |
1156 | s->clean_result = SWAP_FAILURE_TIMEOUT; | |
1157 | ||
1158 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, 0); | |
1159 | break; | |
1160 | ||
e04aad61 | 1161 | default: |
04499a70 | 1162 | assert_not_reached(); |
e04aad61 | 1163 | } |
718db961 LP |
1164 | |
1165 | return 0; | |
e04aad61 LP |
1166 | } |
1167 | ||
1168 | static int swap_load_proc_swaps(Manager *m, bool set_flags) { | |
e04aad61 LP |
1169 | assert(m); |
1170 | ||
07b0b134 | 1171 | rewind(m->proc_swaps); |
bab45044 | 1172 | |
4e85aff4 | 1173 | (void) fscanf(m->proc_swaps, "%*s %*s %*s %*s %*s\n"); |
07b0b134 | 1174 | |
fe96c0f8 | 1175 | for (unsigned i = 1;; i++) { |
9fb3675e | 1176 | _cleanup_free_ char *dev = NULL, *d = NULL; |
07b0b134 ML |
1177 | int prio = 0, k; |
1178 | ||
646134dc ZJS |
1179 | k = fscanf(m->proc_swaps, |
1180 | "%ms " /* device/file */ | |
1181 | "%*s " /* type of swap */ | |
1182 | "%*s " /* swap size */ | |
1183 | "%*s " /* used */ | |
1184 | "%i\n", /* priority */ | |
1185 | &dev, &prio); | |
1186 | if (k != 2) { | |
07b0b134 | 1187 | if (k == EOF) |
4e85aff4 | 1188 | break; |
07b0b134 | 1189 | |
628c89cc | 1190 | log_warning("Failed to parse /proc/swaps:%u.", i); |
e04aad61 | 1191 | continue; |
07b0b134 | 1192 | } |
07b0b134 | 1193 | |
e437538f ZJS |
1194 | ssize_t l = cunescape(dev, UNESCAPE_RELAX, &d); |
1195 | if (l < 0) | |
1196 | return log_error_errno(l, "Failed to unescape device path: %m"); | |
628c89cc | 1197 | |
485ae697 | 1198 | device_found_node(m, d, DEVICE_FOUND_SWAP, DEVICE_FOUND_SWAP); |
4e85aff4 | 1199 | |
eb04385d | 1200 | (void) swap_process_new(m, d, prio, set_flags); |
07b0b134 ML |
1201 | } |
1202 | ||
eb04385d | 1203 | return 0; |
e04aad61 LP |
1204 | } |
1205 | ||
bcce581d | 1206 | static int swap_process_proc_swaps(Manager *m) { |
4e434314 LP |
1207 | int r; |
1208 | ||
1209 | assert(m); | |
4e434314 | 1210 | |
646134dc ZJS |
1211 | r = swap_load_proc_swaps(m, true); |
1212 | if (r < 0) { | |
da927ba9 | 1213 | log_error_errno(r, "Failed to reread /proc/swaps: %m"); |
e04aad61 LP |
1214 | |
1215 | /* Reset flags, just in case, for late calls */ | |
595ed347 MS |
1216 | LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) { |
1217 | Swap *swap = SWAP(u); | |
e04aad61 | 1218 | |
c73f413d FS |
1219 | assert(swap); |
1220 | ||
e04aad61 LP |
1221 | swap->is_active = swap->just_activated = false; |
1222 | } | |
1223 | ||
1224 | return 0; | |
1225 | } | |
1226 | ||
1227 | manager_dispatch_load_queue(m); | |
1228 | ||
595ed347 MS |
1229 | LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) { |
1230 | Swap *swap = SWAP(u); | |
e04aad61 | 1231 | |
c73f413d FS |
1232 | assert(swap); |
1233 | ||
e04aad61 | 1234 | if (!swap->is_active) { |
e04aad61 | 1235 | |
e04aad61 LP |
1236 | swap_unset_proc_swaps(swap); |
1237 | ||
1238 | switch (swap->state) { | |
1239 | ||
1240 | case SWAP_ACTIVE: | |
ba6fbb2c | 1241 | /* This has just been deactivated */ |
e1770af8 | 1242 | swap_enter_dead(swap, SWAP_SUCCESS); |
e04aad61 LP |
1243 | break; |
1244 | ||
1245 | default: | |
5bcb0f2b | 1246 | /* Fire again */ |
e04aad61 LP |
1247 | swap_set_state(swap, swap->state); |
1248 | break; | |
1249 | } | |
1250 | ||
628c89cc | 1251 | if (swap->what) |
b1ba0ce8 | 1252 | device_found_node(m, swap->what, DEVICE_NOT_FOUND, DEVICE_FOUND_SWAP); |
628c89cc | 1253 | |
e04aad61 LP |
1254 | } else if (swap->just_activated) { |
1255 | ||
1256 | /* New swap entry */ | |
1257 | ||
1258 | switch (swap->state) { | |
1259 | ||
1260 | case SWAP_DEAD: | |
1261 | case SWAP_FAILED: | |
31135818 LP |
1262 | (void) unit_acquire_invocation_id(u); |
1263 | swap_cycle_clear(swap); | |
e1770af8 | 1264 | swap_enter_active(swap, SWAP_SUCCESS); |
e04aad61 LP |
1265 | break; |
1266 | ||
5bcb0f2b LP |
1267 | case SWAP_ACTIVATING: |
1268 | swap_set_state(swap, SWAP_ACTIVATING_DONE); | |
1269 | break; | |
1270 | ||
e04aad61 LP |
1271 | default: |
1272 | /* Nothing really changed, but let's | |
1273 | * issue an notification call | |
1274 | * nonetheless, in case somebody is | |
1275 | * waiting for this. */ | |
1276 | swap_set_state(swap, swap->state); | |
1277 | break; | |
1278 | } | |
1279 | } | |
1280 | ||
1281 | /* Reset the flags for later calls */ | |
1282 | swap->is_active = swap->just_activated = false; | |
1283 | } | |
1284 | ||
1285 | return 1; | |
1286 | } | |
1287 | ||
bcce581d LP |
1288 | static int swap_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) { |
1289 | Manager *m = userdata; | |
1290 | ||
1291 | assert(m); | |
1292 | assert(revents & EPOLLPRI); | |
1293 | ||
1294 | return swap_process_proc_swaps(m); | |
1295 | } | |
1296 | ||
e04aad61 LP |
1297 | static Unit *swap_following(Unit *u) { |
1298 | Swap *s = SWAP(u); | |
03677889 | 1299 | Swap *first = NULL; |
e04aad61 LP |
1300 | |
1301 | assert(s); | |
1302 | ||
cdc89820 ZJS |
1303 | /* If the user configured the swap through /etc/fstab or |
1304 | * a device unit, follow that. */ | |
1305 | ||
1306 | if (s->from_fragment) | |
e04aad61 LP |
1307 | return NULL; |
1308 | ||
caac2704 | 1309 | LIST_FOREACH_OTHERS(same_devnode, other, s) |
cdc89820 ZJS |
1310 | if (other->from_fragment) |
1311 | return UNIT(other); | |
1312 | ||
b938cb90 | 1313 | /* Otherwise, make everybody follow the unit that's named after |
cdc89820 ZJS |
1314 | * the swap device in the kernel */ |
1315 | ||
1316 | if (streq_ptr(s->what, s->devnode)) | |
1317 | return NULL; | |
e04aad61 | 1318 | |
bd335c96 | 1319 | LIST_FOREACH(same_devnode, other, s->same_devnode_next) |
9670d583 | 1320 | if (streq_ptr(other->what, other->devnode)) |
e04aad61 LP |
1321 | return UNIT(other); |
1322 | ||
bd335c96 | 1323 | LIST_FOREACH_BACKWARDS(same_devnode, other, s->same_devnode_prev) { |
9670d583 | 1324 | if (streq_ptr(other->what, other->devnode)) |
e04aad61 LP |
1325 | return UNIT(other); |
1326 | ||
1327 | first = other; | |
1328 | } | |
1329 | ||
cdc89820 | 1330 | /* Fall back to the first on the list */ |
e04aad61 | 1331 | return UNIT(first); |
07b0b134 ML |
1332 | } |
1333 | ||
6210e7fc | 1334 | static int swap_following_set(Unit *u, Set **_set) { |
03677889 | 1335 | Swap *s = SWAP(u); |
af4fa99d | 1336 | _cleanup_set_free_ Set *set = NULL; |
6210e7fc LP |
1337 | int r; |
1338 | ||
1339 | assert(s); | |
1340 | assert(_set); | |
1341 | ||
9670d583 | 1342 | if (LIST_JUST_US(same_devnode, s)) { |
6210e7fc LP |
1343 | *_set = NULL; |
1344 | return 0; | |
1345 | } | |
1346 | ||
d5099efc | 1347 | set = set_new(NULL); |
5bcb0f2b | 1348 | if (!set) |
6210e7fc LP |
1349 | return -ENOMEM; |
1350 | ||
caac2704 | 1351 | LIST_FOREACH_OTHERS(same_devnode, other, s) { |
5bcb0f2b LP |
1352 | r = set_put(set, other); |
1353 | if (r < 0) | |
95f14a3e | 1354 | return r; |
5bcb0f2b | 1355 | } |
6210e7fc | 1356 | |
95f14a3e | 1357 | *_set = TAKE_PTR(set); |
6210e7fc | 1358 | return 1; |
6210e7fc LP |
1359 | } |
1360 | ||
07b0b134 ML |
1361 | static void swap_shutdown(Manager *m) { |
1362 | assert(m); | |
1363 | ||
5dcadb4c | 1364 | m->swap_event_source = sd_event_source_disable_unref(m->swap_event_source); |
74ca738f | 1365 | m->proc_swaps = safe_fclose(m->proc_swaps); |
525d3cc7 | 1366 | m->swaps_by_devnode = hashmap_free(m->swaps_by_devnode); |
07b0b134 ML |
1367 | } |
1368 | ||
ba64af90 | 1369 | static void swap_enumerate(Manager *m) { |
07b0b134 | 1370 | int r; |
9670d583 | 1371 | |
07b0b134 ML |
1372 | assert(m); |
1373 | ||
4e434314 | 1374 | if (!m->proc_swaps) { |
646134dc | 1375 | m->proc_swaps = fopen("/proc/swaps", "re"); |
ba64af90 LP |
1376 | if (!m->proc_swaps) { |
1377 | if (errno == ENOENT) | |
cb209a04 | 1378 | log_debug_errno(errno, "Not swap enabled, skipping enumeration."); |
ba64af90 | 1379 | else |
cb209a04 | 1380 | log_warning_errno(errno, "Failed to open /proc/swaps, ignoring: %m"); |
ba64af90 LP |
1381 | |
1382 | return; | |
1383 | } | |
4e434314 | 1384 | |
151b9b96 | 1385 | r = sd_event_add_io(m->event, &m->swap_event_source, fileno(m->proc_swaps), EPOLLPRI, swap_dispatch_io, m); |
ba64af90 LP |
1386 | if (r < 0) { |
1387 | log_error_errno(r, "Failed to watch /proc/swaps: %m"); | |
29083707 | 1388 | goto fail; |
ba64af90 | 1389 | } |
29083707 LP |
1390 | |
1391 | /* Dispatch this before we dispatch SIGCHLD, so that | |
1392 | * we always get the events from /proc/swaps before | |
1393 | * the SIGCHLD of /sbin/swapon. */ | |
83231637 | 1394 | r = sd_event_source_set_priority(m->swap_event_source, SD_EVENT_PRIORITY_NORMAL-10); |
ba64af90 LP |
1395 | if (r < 0) { |
1396 | log_error_errno(r, "Failed to change /proc/swaps priority: %m"); | |
718db961 | 1397 | goto fail; |
ba64af90 | 1398 | } |
7dfbe2e3 TG |
1399 | |
1400 | (void) sd_event_source_set_description(m->swap_event_source, "swap-proc"); | |
4e434314 LP |
1401 | } |
1402 | ||
646134dc ZJS |
1403 | r = swap_load_proc_swaps(m, false); |
1404 | if (r < 0) | |
718db961 LP |
1405 | goto fail; |
1406 | ||
ba64af90 | 1407 | return; |
07b0b134 | 1408 | |
718db961 LP |
1409 | fail: |
1410 | swap_shutdown(m); | |
07b0b134 ML |
1411 | } |
1412 | ||
4366e598 | 1413 | int swap_process_device_new(Manager *m, sd_device *dev) { |
9670d583 | 1414 | _cleanup_free_ char *e = NULL; |
4366e598 | 1415 | const char *dn, *devlink; |
cabf58b2 | 1416 | Unit *u; |
c53aafb7 | 1417 | int r; |
9670d583 LP |
1418 | |
1419 | assert(m); | |
1420 | assert(dev); | |
1421 | ||
e82c6e8b | 1422 | if (sd_device_get_devname(dev, &dn) < 0) |
9670d583 LP |
1423 | return 0; |
1424 | ||
7410616c | 1425 | r = unit_name_from_path(dn, ".swap", &e); |
e82c6e8b LP |
1426 | if (r < 0) { |
1427 | log_debug_errno(r, "Cannot convert device name '%s' to unit name, ignoring: %m", dn); | |
1428 | return 0; | |
1429 | } | |
9670d583 | 1430 | |
cabf58b2 FB |
1431 | u = manager_get_unit(m, e); |
1432 | if (u) | |
1433 | r = swap_set_devnode(SWAP(u), dn); | |
9670d583 | 1434 | |
4366e598 | 1435 | FOREACH_DEVICE_DEVLINK(dev, devlink) { |
9670d583 | 1436 | _cleanup_free_ char *n = NULL; |
7410616c | 1437 | int q; |
9670d583 | 1438 | |
4366e598 | 1439 | q = unit_name_from_path(devlink, ".swap", &n); |
03e52e8c | 1440 | if (q == -EINVAL) /* If the name is not convertible to unit name, we can't manage it */ |
598a6a84 | 1441 | continue; |
7410616c LP |
1442 | if (q < 0) |
1443 | return q; | |
9670d583 | 1444 | |
cabf58b2 FB |
1445 | u = manager_get_unit(m, n); |
1446 | if (u) { | |
1447 | q = swap_set_devnode(SWAP(u), dn); | |
9670d583 LP |
1448 | if (q < 0) |
1449 | r = q; | |
1450 | } | |
1451 | } | |
1452 | ||
1453 | return r; | |
1454 | } | |
1455 | ||
4366e598 | 1456 | int swap_process_device_remove(Manager *m, sd_device *dev) { |
9670d583 | 1457 | const char *dn; |
c53aafb7 | 1458 | int r; |
9670d583 LP |
1459 | Swap *s; |
1460 | ||
4366e598 YW |
1461 | r = sd_device_get_devname(dev, &dn); |
1462 | if (r < 0) | |
9670d583 LP |
1463 | return 0; |
1464 | ||
1465 | while ((s = hashmap_get(m->swaps_by_devnode, dn))) { | |
1466 | int q; | |
1467 | ||
1468 | q = swap_set_devnode(s, NULL); | |
1469 | if (q < 0) | |
1470 | r = q; | |
1471 | } | |
1472 | ||
1473 | return r; | |
1474 | } | |
1475 | ||
fdf20a31 | 1476 | static void swap_reset_failed(Unit *u) { |
5632e374 LP |
1477 | Swap *s = SWAP(u); |
1478 | ||
1479 | assert(s); | |
1480 | ||
fdf20a31 | 1481 | if (s->state == SWAP_FAILED) |
5632e374 | 1482 | swap_set_state(s, SWAP_DEAD); |
e04aad61 | 1483 | |
e1770af8 | 1484 | s->result = SWAP_SUCCESS; |
a8b689b7 | 1485 | s->clean_result = SWAP_SUCCESS; |
5632e374 LP |
1486 | } |
1487 | ||
718db961 | 1488 | static int swap_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) { |
814cc562 | 1489 | return unit_kill_common(u, who, signo, -1, SWAP(u)->control_pid, error); |
8a0867d6 LP |
1490 | } |
1491 | ||
7a7821c8 | 1492 | static int swap_get_timeout(Unit *u, usec_t *timeout) { |
68db7a3b | 1493 | Swap *s = SWAP(u); |
7a7821c8 | 1494 | usec_t t; |
68db7a3b ZJS |
1495 | int r; |
1496 | ||
c73f413d FS |
1497 | assert(s); |
1498 | assert(u); | |
1499 | ||
68db7a3b ZJS |
1500 | if (!s->timer_event_source) |
1501 | return 0; | |
1502 | ||
7a7821c8 | 1503 | r = sd_event_source_get_time(s->timer_event_source, &t); |
68db7a3b ZJS |
1504 | if (r < 0) |
1505 | return r; | |
7a7821c8 LP |
1506 | if (t == USEC_INFINITY) |
1507 | return 0; | |
68db7a3b | 1508 | |
7a7821c8 | 1509 | *timeout = t; |
68db7a3b ZJS |
1510 | return 1; |
1511 | } | |
1512 | ||
1c2e9646 | 1513 | static bool swap_supported(void) { |
0faacd47 LP |
1514 | static int supported = -1; |
1515 | ||
1516 | /* If swap support is not available in the kernel, or we are | |
1517 | * running in a container we don't support swap units, and any | |
1518 | * attempts to starting one should fail immediately. */ | |
1519 | ||
1520 | if (supported < 0) | |
1521 | supported = | |
1522 | access("/proc/swaps", F_OK) >= 0 && | |
75f86906 | 1523 | detect_container() <= 0; |
0faacd47 LP |
1524 | |
1525 | return supported; | |
1526 | } | |
1527 | ||
291d565a LP |
1528 | static int swap_control_pid(Unit *u) { |
1529 | Swap *s = SWAP(u); | |
1530 | ||
1531 | assert(s); | |
1532 | ||
1533 | return s->control_pid; | |
1534 | } | |
1535 | ||
a8b689b7 YW |
1536 | static int swap_clean(Unit *u, ExecCleanMask mask) { |
1537 | _cleanup_strv_free_ char **l = NULL; | |
1538 | Swap *s = SWAP(u); | |
1539 | int r; | |
1540 | ||
1541 | assert(s); | |
1542 | assert(mask != 0); | |
1543 | ||
1544 | if (s->state != SWAP_DEAD) | |
1545 | return -EBUSY; | |
1546 | ||
1547 | r = exec_context_get_clean_directories(&s->exec_context, u->manager->prefix, mask, &l); | |
1548 | if (r < 0) | |
1549 | return r; | |
1550 | ||
1551 | if (strv_isempty(l)) | |
1552 | return -EUNATCH; | |
1553 | ||
1554 | swap_unwatch_control_pid(s); | |
1555 | s->clean_result = SWAP_SUCCESS; | |
1556 | s->control_command = NULL; | |
1557 | s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; | |
1558 | ||
1559 | r = swap_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->exec_context.timeout_clean_usec)); | |
1560 | if (r < 0) | |
1561 | goto fail; | |
1562 | ||
1563 | r = unit_fork_and_watch_rm_rf(u, l, &s->control_pid); | |
1564 | if (r < 0) | |
1565 | goto fail; | |
1566 | ||
1567 | swap_set_state(s, SWAP_CLEANING); | |
1568 | ||
1569 | return 0; | |
1570 | ||
1571 | fail: | |
1572 | log_unit_warning_errno(u, r, "Failed to initiate cleaning: %m"); | |
1573 | s->clean_result = SWAP_FAILURE_RESOURCES; | |
5dcadb4c | 1574 | s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source); |
a8b689b7 YW |
1575 | return r; |
1576 | } | |
1577 | ||
1578 | static int swap_can_clean(Unit *u, ExecCleanMask *ret) { | |
1579 | Swap *s = SWAP(u); | |
1580 | ||
1581 | assert(s); | |
1582 | ||
1583 | return exec_context_get_clean_mask(&s->exec_context, ret); | |
1584 | } | |
1585 | ||
705578c3 | 1586 | static int swap_can_start(Unit *u) { |
9727f242 DDM |
1587 | Swap *s = SWAP(u); |
1588 | int r; | |
1589 | ||
1590 | assert(s); | |
1591 | ||
1592 | r = unit_test_start_limit(u); | |
1593 | if (r < 0) { | |
1594 | swap_enter_dead(s, SWAP_FAILURE_START_LIMIT_HIT); | |
1595 | return r; | |
1596 | } | |
1597 | ||
705578c3 | 1598 | return 1; |
9727f242 DDM |
1599 | } |
1600 | ||
e04aad61 | 1601 | static const char* const swap_exec_command_table[_SWAP_EXEC_COMMAND_MAX] = { |
48d83e33 | 1602 | [SWAP_EXEC_ACTIVATE] = "ExecActivate", |
e04aad61 LP |
1603 | [SWAP_EXEC_DEACTIVATE] = "ExecDeactivate", |
1604 | }; | |
1605 | ||
1606 | DEFINE_STRING_TABLE_LOOKUP(swap_exec_command, SwapExecCommand); | |
1607 | ||
e1770af8 | 1608 | static const char* const swap_result_table[_SWAP_RESULT_MAX] = { |
48d83e33 ZJS |
1609 | [SWAP_SUCCESS] = "success", |
1610 | [SWAP_FAILURE_RESOURCES] = "resources", | |
1611 | [SWAP_FAILURE_TIMEOUT] = "timeout", | |
1612 | [SWAP_FAILURE_EXIT_CODE] = "exit-code", | |
1613 | [SWAP_FAILURE_SIGNAL] = "signal", | |
1614 | [SWAP_FAILURE_CORE_DUMP] = "core-dump", | |
07299350 | 1615 | [SWAP_FAILURE_START_LIMIT_HIT] = "start-limit-hit", |
e1770af8 LP |
1616 | }; |
1617 | ||
1618 | DEFINE_STRING_TABLE_LOOKUP(swap_result, SwapResult); | |
1619 | ||
07b0b134 | 1620 | const UnitVTable swap_vtable = { |
7d17cfbc | 1621 | .object_size = sizeof(Swap), |
718db961 LP |
1622 | .exec_context_offset = offsetof(Swap, exec_context), |
1623 | .cgroup_context_offset = offsetof(Swap, cgroup_context), | |
1624 | .kill_context_offset = offsetof(Swap, kill_context), | |
613b411c | 1625 | .exec_runtime_offset = offsetof(Swap, exec_runtime), |
29206d46 | 1626 | .dynamic_creds_offset = offsetof(Swap, dynamic_creds), |
3ef63c31 | 1627 | |
f975e971 LP |
1628 | .sections = |
1629 | "Unit\0" | |
1630 | "Swap\0" | |
1631 | "Install\0", | |
4ad49000 | 1632 | .private_section = "Swap", |
71645aca | 1633 | |
c80a9a33 LP |
1634 | .can_fail = true, |
1635 | ||
4e85aff4 | 1636 | .init = swap_init, |
07b0b134 | 1637 | .load = swap_load, |
6e620bec | 1638 | .done = swap_done, |
07b0b134 ML |
1639 | |
1640 | .coldplug = swap_coldplug, | |
1641 | ||
1642 | .dump = swap_dump, | |
1643 | ||
1644 | .start = swap_start, | |
1645 | .stop = swap_stop, | |
1646 | ||
8a0867d6 | 1647 | .kill = swap_kill, |
a8b689b7 YW |
1648 | .clean = swap_clean, |
1649 | .can_clean = swap_can_clean, | |
8a0867d6 | 1650 | |
68db7a3b ZJS |
1651 | .get_timeout = swap_get_timeout, |
1652 | ||
07b0b134 ML |
1653 | .serialize = swap_serialize, |
1654 | .deserialize_item = swap_deserialize_item, | |
1655 | ||
1656 | .active_state = swap_active_state, | |
1657 | .sub_state_to_string = swap_sub_state_to_string, | |
1658 | ||
52a12341 YW |
1659 | .will_restart = unit_will_restart_default, |
1660 | ||
f2f725e5 | 1661 | .may_gc = swap_may_gc, |
39c79477 | 1662 | .is_extrinsic = swap_is_extrinsic, |
07b0b134 | 1663 | |
e04aad61 | 1664 | .sigchld_event = swap_sigchld_event, |
e04aad61 LP |
1665 | |
1666 | .reset_failed = swap_reset_failed, | |
1667 | ||
291d565a LP |
1668 | .control_pid = swap_control_pid, |
1669 | ||
74c964d3 LP |
1670 | .bus_set_property = bus_swap_set_property, |
1671 | .bus_commit_properties = bus_swap_commit_properties, | |
07b0b134 | 1672 | |
e04aad61 | 1673 | .following = swap_following, |
6210e7fc | 1674 | .following_set = swap_following_set, |
5632e374 | 1675 | |
6e620bec | 1676 | .enumerate = swap_enumerate, |
c6918296 | 1677 | .shutdown = swap_shutdown, |
0faacd47 | 1678 | .supported = swap_supported, |
c6918296 MS |
1679 | |
1680 | .status_message_formats = { | |
1681 | .starting_stopping = { | |
1682 | [0] = "Activating swap %s...", | |
1683 | [1] = "Deactivating swap %s...", | |
1684 | }, | |
1685 | .finished_start_job = { | |
1686 | [JOB_DONE] = "Activated swap %s.", | |
1687 | [JOB_FAILED] = "Failed to activate swap %s.", | |
c6918296 MS |
1688 | [JOB_TIMEOUT] = "Timed out activating swap %s.", |
1689 | }, | |
1690 | .finished_stop_job = { | |
1691 | [JOB_DONE] = "Deactivated swap %s.", | |
1692 | [JOB_FAILED] = "Failed deactivating swap %s.", | |
1693 | [JOB_TIMEOUT] = "Timed out deactivating swap %s.", | |
1694 | }, | |
1695 | }, | |
9727f242 | 1696 | |
705578c3 | 1697 | .can_start = swap_can_start, |
07b0b134 | 1698 | }; |