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