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