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Merge pull request #6214 from keszybz/resolved-packet-size
[thirdparty/systemd.git] / src / core / swap.c
1 /***
2 This file is part of systemd.
3
4 Copyright 2010 Lennart Poettering
5
6 systemd is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as published by
8 the Free Software Foundation; either version 2.1 of the License, or
9 (at your option) any later version.
10
11 systemd is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public License
17 along with systemd; If not, see <http://www.gnu.org/licenses/>.
18 ***/
19
20 #include <errno.h>
21 #include <sys/epoll.h>
22 #include <sys/stat.h>
23 #include <unistd.h>
24
25 #include "libudev.h"
26
27 #include "alloc-util.h"
28 #include "dbus-swap.h"
29 #include "escape.h"
30 #include "exit-status.h"
31 #include "fd-util.h"
32 #include "format-util.h"
33 #include "fstab-util.h"
34 #include "parse-util.h"
35 #include "path-util.h"
36 #include "process-util.h"
37 #include "special.h"
38 #include "string-table.h"
39 #include "string-util.h"
40 #include "swap.h"
41 #include "udev-util.h"
42 #include "unit-name.h"
43 #include "unit.h"
44 #include "virt.h"
45
46 static const UnitActiveState state_translation_table[_SWAP_STATE_MAX] = {
47 [SWAP_DEAD] = UNIT_INACTIVE,
48 [SWAP_ACTIVATING] = UNIT_ACTIVATING,
49 [SWAP_ACTIVATING_DONE] = UNIT_ACTIVE,
50 [SWAP_ACTIVE] = UNIT_ACTIVE,
51 [SWAP_DEACTIVATING] = UNIT_DEACTIVATING,
52 [SWAP_ACTIVATING_SIGTERM] = UNIT_DEACTIVATING,
53 [SWAP_ACTIVATING_SIGKILL] = UNIT_DEACTIVATING,
54 [SWAP_DEACTIVATING_SIGTERM] = UNIT_DEACTIVATING,
55 [SWAP_DEACTIVATING_SIGKILL] = UNIT_DEACTIVATING,
56 [SWAP_FAILED] = UNIT_FAILED
57 };
58
59 static int swap_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata);
60 static int swap_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata);
61
62 static void swap_unset_proc_swaps(Swap *s) {
63 assert(s);
64
65 if (!s->from_proc_swaps)
66 return;
67
68 s->parameters_proc_swaps.what = mfree(s->parameters_proc_swaps.what);
69
70 s->from_proc_swaps = false;
71 }
72
73 static int swap_set_devnode(Swap *s, const char *devnode) {
74 Hashmap *swaps;
75 Swap *first;
76 int r;
77
78 assert(s);
79
80 r = hashmap_ensure_allocated(&UNIT(s)->manager->swaps_by_devnode, &string_hash_ops);
81 if (r < 0)
82 return r;
83
84 swaps = UNIT(s)->manager->swaps_by_devnode;
85
86 if (s->devnode) {
87 first = hashmap_get(swaps, s->devnode);
88
89 LIST_REMOVE(same_devnode, first, s);
90 if (first)
91 hashmap_replace(swaps, first->devnode, first);
92 else
93 hashmap_remove(swaps, s->devnode);
94
95 s->devnode = mfree(s->devnode);
96 }
97
98 if (devnode) {
99 s->devnode = strdup(devnode);
100 if (!s->devnode)
101 return -ENOMEM;
102
103 first = hashmap_get(swaps, s->devnode);
104 LIST_PREPEND(same_devnode, first, s);
105
106 return hashmap_replace(swaps, first->devnode, first);
107 }
108
109 return 0;
110 }
111
112 static void swap_init(Unit *u) {
113 Swap *s = SWAP(u);
114
115 assert(s);
116 assert(UNIT(s)->load_state == UNIT_STUB);
117
118 s->timeout_usec = u->manager->default_timeout_start_usec;
119
120 s->exec_context.std_output = u->manager->default_std_output;
121 s->exec_context.std_error = u->manager->default_std_error;
122
123 s->parameters_proc_swaps.priority = s->parameters_fragment.priority = -1;
124
125 s->control_command_id = _SWAP_EXEC_COMMAND_INVALID;
126
127 u->ignore_on_isolate = true;
128 }
129
130 static void swap_unwatch_control_pid(Swap *s) {
131 assert(s);
132
133 if (s->control_pid <= 0)
134 return;
135
136 unit_unwatch_pid(UNIT(s), s->control_pid);
137 s->control_pid = 0;
138 }
139
140 static void swap_done(Unit *u) {
141 Swap *s = SWAP(u);
142
143 assert(s);
144
145 swap_unset_proc_swaps(s);
146 swap_set_devnode(s, NULL);
147
148 s->what = mfree(s->what);
149 s->parameters_fragment.what = mfree(s->parameters_fragment.what);
150 s->parameters_fragment.options = mfree(s->parameters_fragment.options);
151
152 s->exec_runtime = exec_runtime_unref(s->exec_runtime);
153 exec_command_done_array(s->exec_command, _SWAP_EXEC_COMMAND_MAX);
154 s->control_command = NULL;
155
156 dynamic_creds_unref(&s->dynamic_creds);
157
158 swap_unwatch_control_pid(s);
159
160 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
161 }
162
163 static int swap_arm_timer(Swap *s, usec_t usec) {
164 int r;
165
166 assert(s);
167
168 if (s->timer_event_source) {
169 r = sd_event_source_set_time(s->timer_event_source, usec);
170 if (r < 0)
171 return r;
172
173 return sd_event_source_set_enabled(s->timer_event_source, SD_EVENT_ONESHOT);
174 }
175
176 if (usec == USEC_INFINITY)
177 return 0;
178
179 r = sd_event_add_time(
180 UNIT(s)->manager->event,
181 &s->timer_event_source,
182 CLOCK_MONOTONIC,
183 usec, 0,
184 swap_dispatch_timer, s);
185 if (r < 0)
186 return r;
187
188 (void) sd_event_source_set_description(s->timer_event_source, "swap-timer");
189
190 return 0;
191 }
192
193 static int swap_add_device_links(Swap *s) {
194 assert(s);
195
196 if (!s->what)
197 return 0;
198
199 if (!s->from_fragment)
200 return 0;
201
202 if (is_device_path(s->what))
203 return unit_add_node_link(UNIT(s), s->what, MANAGER_IS_SYSTEM(UNIT(s)->manager), UNIT_BINDS_TO);
204 else
205 /* File based swap devices need to be ordered after
206 * systemd-remount-fs.service, since they might need a
207 * writable file system. */
208 return unit_add_dependency_by_name(UNIT(s), UNIT_AFTER, SPECIAL_REMOUNT_FS_SERVICE, NULL, true);
209 }
210
211 static int swap_add_default_dependencies(Swap *s) {
212 int r;
213
214 assert(s);
215
216 if (!UNIT(s)->default_dependencies)
217 return 0;
218
219 if (!MANAGER_IS_SYSTEM(UNIT(s)->manager))
220 return 0;
221
222 if (detect_container() > 0)
223 return 0;
224
225 /* swap units generated for the swap dev links are missing the
226 * ordering dep against the swap target. */
227 r = unit_add_dependency_by_name(UNIT(s), UNIT_BEFORE, SPECIAL_SWAP_TARGET, NULL, true);
228 if (r < 0)
229 return r;
230
231 return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true);
232 }
233
234 static int swap_verify(Swap *s) {
235 _cleanup_free_ char *e = NULL;
236 int r;
237
238 if (UNIT(s)->load_state != UNIT_LOADED)
239 return 0;
240
241 r = unit_name_from_path(s->what, ".swap", &e);
242 if (r < 0)
243 return log_unit_error_errno(UNIT(s), r, "Failed to generate unit name from path: %m");
244
245 if (!unit_has_name(UNIT(s), e)) {
246 log_unit_error(UNIT(s), "Value of What= and unit name do not match, not loading.");
247 return -EINVAL;
248 }
249
250 if (s->exec_context.pam_name && s->kill_context.kill_mode != KILL_CONTROL_GROUP) {
251 log_unit_error(UNIT(s), "Unit has PAM enabled. Kill mode must be set to 'control-group'. Refusing to load.");
252 return -EINVAL;
253 }
254
255 return 0;
256 }
257
258 static int swap_load_devnode(Swap *s) {
259 _cleanup_udev_device_unref_ struct udev_device *d = NULL;
260 struct stat st;
261 const char *p;
262
263 assert(s);
264
265 if (stat(s->what, &st) < 0 || !S_ISBLK(st.st_mode))
266 return 0;
267
268 d = udev_device_new_from_devnum(UNIT(s)->manager->udev, 'b', st.st_rdev);
269 if (!d)
270 return 0;
271
272 p = udev_device_get_devnode(d);
273 if (!p)
274 return 0;
275
276 return swap_set_devnode(s, p);
277 }
278
279 static int swap_load(Unit *u) {
280 int r;
281 Swap *s = SWAP(u);
282
283 assert(s);
284 assert(u->load_state == UNIT_STUB);
285
286 /* Load a .swap file */
287 r = unit_load_fragment_and_dropin_optional(u);
288 if (r < 0)
289 return r;
290
291 if (u->load_state == UNIT_LOADED) {
292
293 if (UNIT(s)->fragment_path)
294 s->from_fragment = true;
295
296 if (!s->what) {
297 if (s->parameters_fragment.what)
298 s->what = strdup(s->parameters_fragment.what);
299 else if (s->parameters_proc_swaps.what)
300 s->what = strdup(s->parameters_proc_swaps.what);
301 else {
302 r = unit_name_to_path(u->id, &s->what);
303 if (r < 0)
304 return r;
305 }
306
307 if (!s->what)
308 return -ENOMEM;
309 }
310
311 path_kill_slashes(s->what);
312
313 if (!UNIT(s)->description) {
314 r = unit_set_description(u, s->what);
315 if (r < 0)
316 return r;
317 }
318
319 r = unit_require_mounts_for(UNIT(s), s->what);
320 if (r < 0)
321 return r;
322
323 r = swap_add_device_links(s);
324 if (r < 0)
325 return r;
326
327 r = swap_load_devnode(s);
328 if (r < 0)
329 return r;
330
331 r = unit_patch_contexts(u);
332 if (r < 0)
333 return r;
334
335 r = unit_add_exec_dependencies(u, &s->exec_context);
336 if (r < 0)
337 return r;
338
339 r = unit_set_default_slice(u);
340 if (r < 0)
341 return r;
342
343 r = swap_add_default_dependencies(s);
344 if (r < 0)
345 return r;
346 }
347
348 return swap_verify(s);
349 }
350
351 static int swap_setup_unit(
352 Manager *m,
353 const char *what,
354 const char *what_proc_swaps,
355 int priority,
356 bool set_flags) {
357
358 _cleanup_free_ char *e = NULL;
359 bool delete = false;
360 Unit *u = NULL;
361 int r;
362 SwapParameters *p;
363
364 assert(m);
365 assert(what);
366 assert(what_proc_swaps);
367
368 r = unit_name_from_path(what, ".swap", &e);
369 if (r < 0)
370 return log_unit_error_errno(u, r, "Failed to generate unit name from path: %m");
371
372 u = manager_get_unit(m, e);
373
374 if (u &&
375 SWAP(u)->from_proc_swaps &&
376 !path_equal(SWAP(u)->parameters_proc_swaps.what, what_proc_swaps)) {
377 log_error("Swap %s appeared twice with different device paths %s and %s", e, SWAP(u)->parameters_proc_swaps.what, what_proc_swaps);
378 return -EEXIST;
379 }
380
381 if (!u) {
382 delete = true;
383
384 r = unit_new_for_name(m, sizeof(Swap), e, &u);
385 if (r < 0)
386 goto fail;
387
388 SWAP(u)->what = strdup(what);
389 if (!SWAP(u)->what) {
390 r = -ENOMEM;
391 goto fail;
392 }
393
394 unit_add_to_load_queue(u);
395 } else
396 delete = false;
397
398 p = &SWAP(u)->parameters_proc_swaps;
399
400 if (!p->what) {
401 p->what = strdup(what_proc_swaps);
402 if (!p->what) {
403 r = -ENOMEM;
404 goto fail;
405 }
406 }
407
408 if (set_flags) {
409 SWAP(u)->is_active = true;
410 SWAP(u)->just_activated = !SWAP(u)->from_proc_swaps;
411 }
412
413 SWAP(u)->from_proc_swaps = true;
414
415 p->priority = priority;
416
417 unit_add_to_dbus_queue(u);
418 return 0;
419
420 fail:
421 log_unit_warning_errno(u, r, "Failed to load swap unit: %m");
422
423 if (delete)
424 unit_free(u);
425
426 return r;
427 }
428
429 static int swap_process_new(Manager *m, const char *device, int prio, bool set_flags) {
430 _cleanup_udev_device_unref_ struct udev_device *d = NULL;
431 struct udev_list_entry *item = NULL, *first = NULL;
432 const char *dn;
433 struct stat st;
434 int r;
435
436 assert(m);
437
438 r = swap_setup_unit(m, device, device, prio, set_flags);
439 if (r < 0)
440 return r;
441
442 /* If this is a block device, then let's add duplicates for
443 * all other names of this block device */
444 if (stat(device, &st) < 0 || !S_ISBLK(st.st_mode))
445 return 0;
446
447 d = udev_device_new_from_devnum(m->udev, 'b', st.st_rdev);
448 if (!d)
449 return 0;
450
451 /* Add the main device node */
452 dn = udev_device_get_devnode(d);
453 if (dn && !streq(dn, device))
454 swap_setup_unit(m, dn, device, prio, set_flags);
455
456 /* Add additional units for all symlinks */
457 first = udev_device_get_devlinks_list_entry(d);
458 udev_list_entry_foreach(item, first) {
459 const char *p;
460
461 /* Don't bother with the /dev/block links */
462 p = udev_list_entry_get_name(item);
463
464 if (streq(p, device))
465 continue;
466
467 if (path_startswith(p, "/dev/block/"))
468 continue;
469
470 if (stat(p, &st) >= 0)
471 if (!S_ISBLK(st.st_mode) ||
472 st.st_rdev != udev_device_get_devnum(d))
473 continue;
474
475 swap_setup_unit(m, p, device, prio, set_flags);
476 }
477
478 return r;
479 }
480
481 static void swap_set_state(Swap *s, SwapState state) {
482 SwapState old_state;
483 Swap *other;
484
485 assert(s);
486
487 old_state = s->state;
488 s->state = state;
489
490 if (!IN_SET(state,
491 SWAP_ACTIVATING,
492 SWAP_ACTIVATING_SIGTERM,
493 SWAP_ACTIVATING_SIGKILL,
494 SWAP_ACTIVATING_DONE,
495 SWAP_DEACTIVATING,
496 SWAP_DEACTIVATING_SIGTERM,
497 SWAP_DEACTIVATING_SIGKILL)) {
498 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
499 swap_unwatch_control_pid(s);
500 s->control_command = NULL;
501 s->control_command_id = _SWAP_EXEC_COMMAND_INVALID;
502 }
503
504 if (state != old_state)
505 log_unit_debug(UNIT(s), "Changed %s -> %s", swap_state_to_string(old_state), swap_state_to_string(state));
506
507 unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], true);
508
509 /* If there other units for the same device node have a job
510 queued it might be worth checking again if it is runnable
511 now. This is necessary, since swap_start() refuses
512 operation with EAGAIN if there's already another job for
513 the same device node queued. */
514 LIST_FOREACH_OTHERS(same_devnode, other, s)
515 if (UNIT(other)->job)
516 job_add_to_run_queue(UNIT(other)->job);
517 }
518
519 static int swap_coldplug(Unit *u) {
520 Swap *s = SWAP(u);
521 SwapState new_state = SWAP_DEAD;
522 int r;
523
524 assert(s);
525 assert(s->state == SWAP_DEAD);
526
527 if (s->deserialized_state != s->state)
528 new_state = s->deserialized_state;
529 else if (s->from_proc_swaps)
530 new_state = SWAP_ACTIVE;
531
532 if (new_state == s->state)
533 return 0;
534
535 if (s->control_pid > 0 &&
536 pid_is_unwaited(s->control_pid) &&
537 IN_SET(new_state,
538 SWAP_ACTIVATING,
539 SWAP_ACTIVATING_SIGTERM,
540 SWAP_ACTIVATING_SIGKILL,
541 SWAP_ACTIVATING_DONE,
542 SWAP_DEACTIVATING,
543 SWAP_DEACTIVATING_SIGTERM,
544 SWAP_DEACTIVATING_SIGKILL)) {
545
546 r = unit_watch_pid(UNIT(s), s->control_pid);
547 if (r < 0)
548 return r;
549
550 r = swap_arm_timer(s, usec_add(u->state_change_timestamp.monotonic, s->timeout_usec));
551 if (r < 0)
552 return r;
553 }
554
555 if (!IN_SET(new_state, SWAP_DEAD, SWAP_FAILED))
556 (void) unit_setup_dynamic_creds(u);
557
558 swap_set_state(s, new_state);
559 return 0;
560 }
561
562 static void swap_dump(Unit *u, FILE *f, const char *prefix) {
563 Swap *s = SWAP(u);
564 SwapParameters *p;
565
566 assert(s);
567 assert(f);
568
569 if (s->from_proc_swaps)
570 p = &s->parameters_proc_swaps;
571 else if (s->from_fragment)
572 p = &s->parameters_fragment;
573 else
574 p = NULL;
575
576 fprintf(f,
577 "%sSwap State: %s\n"
578 "%sResult: %s\n"
579 "%sWhat: %s\n"
580 "%sFrom /proc/swaps: %s\n"
581 "%sFrom fragment: %s\n",
582 prefix, swap_state_to_string(s->state),
583 prefix, swap_result_to_string(s->result),
584 prefix, s->what,
585 prefix, yes_no(s->from_proc_swaps),
586 prefix, yes_no(s->from_fragment));
587
588 if (s->devnode)
589 fprintf(f, "%sDevice Node: %s\n", prefix, s->devnode);
590
591 if (p)
592 fprintf(f,
593 "%sPriority: %i\n"
594 "%sOptions: %s\n",
595 prefix, p->priority,
596 prefix, strempty(p->options));
597
598 if (s->control_pid > 0)
599 fprintf(f,
600 "%sControl PID: "PID_FMT"\n",
601 prefix, s->control_pid);
602
603 exec_context_dump(&s->exec_context, f, prefix);
604 kill_context_dump(&s->kill_context, f, prefix);
605 }
606
607 static int swap_spawn(Swap *s, ExecCommand *c, pid_t *_pid) {
608 pid_t pid;
609 int r;
610 ExecParameters exec_params = {
611 .flags = EXEC_APPLY_PERMISSIONS|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN,
612 .stdin_fd = -1,
613 .stdout_fd = -1,
614 .stderr_fd = -1,
615 };
616
617 assert(s);
618 assert(c);
619 assert(_pid);
620
621 (void) unit_realize_cgroup(UNIT(s));
622 if (s->reset_cpu_usage) {
623 (void) unit_reset_cpu_usage(UNIT(s));
624 s->reset_cpu_usage = false;
625 }
626
627 r = unit_setup_exec_runtime(UNIT(s));
628 if (r < 0)
629 goto fail;
630
631 r = unit_setup_dynamic_creds(UNIT(s));
632 if (r < 0)
633 return r;
634
635 r = swap_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
636 if (r < 0)
637 goto fail;
638
639 exec_params.environment = UNIT(s)->manager->environment;
640 exec_params.confirm_spawn = manager_get_confirm_spawn(UNIT(s)->manager);
641 exec_params.cgroup_supported = UNIT(s)->manager->cgroup_supported;
642 exec_params.cgroup_path = UNIT(s)->cgroup_path;
643 exec_params.cgroup_delegate = s->cgroup_context.delegate;
644 exec_params.runtime_prefix = manager_get_runtime_prefix(UNIT(s)->manager);
645
646 r = exec_spawn(UNIT(s),
647 c,
648 &s->exec_context,
649 &exec_params,
650 s->exec_runtime,
651 &s->dynamic_creds,
652 &pid);
653 if (r < 0)
654 goto fail;
655
656 r = unit_watch_pid(UNIT(s), pid);
657 if (r < 0)
658 /* FIXME: we need to do something here */
659 goto fail;
660
661 *_pid = pid;
662
663 return 0;
664
665 fail:
666 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
667 return r;
668 }
669
670 static void swap_enter_dead(Swap *s, SwapResult f) {
671 assert(s);
672
673 if (s->result == SWAP_SUCCESS)
674 s->result = f;
675
676 swap_set_state(s, s->result != SWAP_SUCCESS ? SWAP_FAILED : SWAP_DEAD);
677
678 exec_runtime_destroy(s->exec_runtime);
679 s->exec_runtime = exec_runtime_unref(s->exec_runtime);
680
681 exec_context_destroy_runtime_directory(&s->exec_context, manager_get_runtime_prefix(UNIT(s)->manager));
682
683 unit_unref_uid_gid(UNIT(s), true);
684
685 dynamic_creds_destroy(&s->dynamic_creds);
686 }
687
688 static void swap_enter_active(Swap *s, SwapResult f) {
689 assert(s);
690
691 if (s->result == SWAP_SUCCESS)
692 s->result = f;
693
694 swap_set_state(s, SWAP_ACTIVE);
695 }
696
697 static void swap_enter_signal(Swap *s, SwapState state, SwapResult f) {
698 int r;
699 KillOperation kop;
700
701 assert(s);
702
703 if (s->result == SWAP_SUCCESS)
704 s->result = f;
705
706 if (IN_SET(state, SWAP_ACTIVATING_SIGTERM, SWAP_DEACTIVATING_SIGTERM))
707 kop = KILL_TERMINATE;
708 else
709 kop = KILL_KILL;
710
711 r = unit_kill_context(UNIT(s), &s->kill_context, kop, -1, s->control_pid, false);
712 if (r < 0)
713 goto fail;
714
715 if (r > 0) {
716 r = swap_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
717 if (r < 0)
718 goto fail;
719
720 swap_set_state(s, state);
721 } else if (state == SWAP_ACTIVATING_SIGTERM)
722 swap_enter_signal(s, SWAP_ACTIVATING_SIGKILL, SWAP_SUCCESS);
723 else if (state == SWAP_DEACTIVATING_SIGTERM)
724 swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, SWAP_SUCCESS);
725 else
726 swap_enter_dead(s, SWAP_SUCCESS);
727
728 return;
729
730 fail:
731 log_unit_warning_errno(UNIT(s), r, "Failed to kill processes: %m");
732 swap_enter_dead(s, SWAP_FAILURE_RESOURCES);
733 }
734
735 static void swap_enter_activating(Swap *s) {
736 _cleanup_free_ char *opts = NULL;
737 int r;
738
739 assert(s);
740
741 s->control_command_id = SWAP_EXEC_ACTIVATE;
742 s->control_command = s->exec_command + SWAP_EXEC_ACTIVATE;
743
744 if (s->from_fragment) {
745 int priority = -1;
746
747 r = fstab_find_pri(s->parameters_fragment.options, &priority);
748 if (r < 0)
749 log_warning_errno(r, "Failed to parse swap priority \"%s\", ignoring: %m", s->parameters_fragment.options);
750 else if (r == 1 && s->parameters_fragment.priority >= 0)
751 log_warning("Duplicate swap priority configuration by Priority and Options fields.");
752
753 if (r <= 0 && s->parameters_fragment.priority >= 0) {
754 if (s->parameters_fragment.options)
755 r = asprintf(&opts, "%s,pri=%i", s->parameters_fragment.options, s->parameters_fragment.priority);
756 else
757 r = asprintf(&opts, "pri=%i", s->parameters_fragment.priority);
758 if (r < 0)
759 goto fail;
760 }
761 }
762
763 r = exec_command_set(s->control_command, "/sbin/swapon", NULL);
764 if (r < 0)
765 goto fail;
766
767 if (s->parameters_fragment.options || opts) {
768 r = exec_command_append(s->control_command, "-o",
769 opts ? : s->parameters_fragment.options, NULL);
770 if (r < 0)
771 goto fail;
772 }
773
774 r = exec_command_append(s->control_command, s->what, NULL);
775 if (r < 0)
776 goto fail;
777
778 swap_unwatch_control_pid(s);
779
780 r = swap_spawn(s, s->control_command, &s->control_pid);
781 if (r < 0)
782 goto fail;
783
784 swap_set_state(s, SWAP_ACTIVATING);
785
786 return;
787
788 fail:
789 log_unit_warning_errno(UNIT(s), r, "Failed to run 'swapon' task: %m");
790 swap_enter_dead(s, SWAP_FAILURE_RESOURCES);
791 }
792
793 static void swap_enter_deactivating(Swap *s) {
794 int r;
795
796 assert(s);
797
798 s->control_command_id = SWAP_EXEC_DEACTIVATE;
799 s->control_command = s->exec_command + SWAP_EXEC_DEACTIVATE;
800
801 r = exec_command_set(s->control_command,
802 "/sbin/swapoff",
803 s->what,
804 NULL);
805 if (r < 0)
806 goto fail;
807
808 swap_unwatch_control_pid(s);
809
810 r = swap_spawn(s, s->control_command, &s->control_pid);
811 if (r < 0)
812 goto fail;
813
814 swap_set_state(s, SWAP_DEACTIVATING);
815
816 return;
817
818 fail:
819 log_unit_warning_errno(UNIT(s), r, "Failed to run 'swapoff' task: %m");
820 swap_enter_active(s, SWAP_FAILURE_RESOURCES);
821 }
822
823 static int swap_start(Unit *u) {
824 Swap *s = SWAP(u), *other;
825 int r;
826
827 assert(s);
828
829 /* We cannot fulfill this request right now, try again later
830 * please! */
831
832 if (IN_SET(s->state,
833 SWAP_DEACTIVATING,
834 SWAP_DEACTIVATING_SIGTERM,
835 SWAP_DEACTIVATING_SIGKILL,
836 SWAP_ACTIVATING_SIGTERM,
837 SWAP_ACTIVATING_SIGKILL))
838 return -EAGAIN;
839
840 if (s->state == SWAP_ACTIVATING)
841 return 0;
842
843 assert(IN_SET(s->state, SWAP_DEAD, SWAP_FAILED));
844
845 if (detect_container() > 0)
846 return -EPERM;
847
848 /* If there's a job for another swap unit for the same node
849 * running, then let's not dispatch this one for now, and wait
850 * until that other job has finished. */
851 LIST_FOREACH_OTHERS(same_devnode, other, s)
852 if (UNIT(other)->job && UNIT(other)->job->state == JOB_RUNNING)
853 return -EAGAIN;
854
855 r = unit_start_limit_test(u);
856 if (r < 0) {
857 swap_enter_dead(s, SWAP_FAILURE_START_LIMIT_HIT);
858 return r;
859 }
860
861 r = unit_acquire_invocation_id(u);
862 if (r < 0)
863 return r;
864
865 s->result = SWAP_SUCCESS;
866 s->reset_cpu_usage = true;
867
868 swap_enter_activating(s);
869 return 1;
870 }
871
872 static int swap_stop(Unit *u) {
873 Swap *s = SWAP(u);
874
875 assert(s);
876
877 if (IN_SET(s->state,
878 SWAP_DEACTIVATING,
879 SWAP_DEACTIVATING_SIGTERM,
880 SWAP_DEACTIVATING_SIGKILL,
881 SWAP_ACTIVATING_SIGTERM,
882 SWAP_ACTIVATING_SIGKILL))
883 return 0;
884
885 assert(IN_SET(s->state, SWAP_ACTIVATING, SWAP_ACTIVATING_DONE, SWAP_ACTIVE));
886
887 if (detect_container() > 0)
888 return -EPERM;
889
890 swap_enter_deactivating(s);
891 return 1;
892 }
893
894 static int swap_serialize(Unit *u, FILE *f, FDSet *fds) {
895 Swap *s = SWAP(u);
896
897 assert(s);
898 assert(f);
899 assert(fds);
900
901 unit_serialize_item(u, f, "state", swap_state_to_string(s->state));
902 unit_serialize_item(u, f, "result", swap_result_to_string(s->result));
903
904 if (s->control_pid > 0)
905 unit_serialize_item_format(u, f, "control-pid", PID_FMT, s->control_pid);
906
907 if (s->control_command_id >= 0)
908 unit_serialize_item(u, f, "control-command", swap_exec_command_to_string(s->control_command_id));
909
910 return 0;
911 }
912
913 static int swap_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
914 Swap *s = SWAP(u);
915
916 assert(s);
917 assert(fds);
918
919 if (streq(key, "state")) {
920 SwapState state;
921
922 state = swap_state_from_string(value);
923 if (state < 0)
924 log_unit_debug(u, "Failed to parse state value: %s", value);
925 else
926 s->deserialized_state = state;
927 } else if (streq(key, "result")) {
928 SwapResult f;
929
930 f = swap_result_from_string(value);
931 if (f < 0)
932 log_unit_debug(u, "Failed to parse result value: %s", value);
933 else if (f != SWAP_SUCCESS)
934 s->result = f;
935 } else if (streq(key, "control-pid")) {
936 pid_t pid;
937
938 if (parse_pid(value, &pid) < 0)
939 log_unit_debug(u, "Failed to parse control-pid value: %s", value);
940 else
941 s->control_pid = pid;
942
943 } else if (streq(key, "control-command")) {
944 SwapExecCommand id;
945
946 id = swap_exec_command_from_string(value);
947 if (id < 0)
948 log_unit_debug(u, "Failed to parse exec-command value: %s", value);
949 else {
950 s->control_command_id = id;
951 s->control_command = s->exec_command + id;
952 }
953 } else
954 log_unit_debug(u, "Unknown serialization key: %s", key);
955
956 return 0;
957 }
958
959 _pure_ static UnitActiveState swap_active_state(Unit *u) {
960 assert(u);
961
962 return state_translation_table[SWAP(u)->state];
963 }
964
965 _pure_ static const char *swap_sub_state_to_string(Unit *u) {
966 assert(u);
967
968 return swap_state_to_string(SWAP(u)->state);
969 }
970
971 _pure_ static bool swap_check_gc(Unit *u) {
972 Swap *s = SWAP(u);
973
974 assert(s);
975
976 return s->from_proc_swaps;
977 }
978
979 static void swap_sigchld_event(Unit *u, pid_t pid, int code, int status) {
980 Swap *s = SWAP(u);
981 SwapResult f;
982
983 assert(s);
984 assert(pid >= 0);
985
986 if (pid != s->control_pid)
987 return;
988
989 s->control_pid = 0;
990
991 if (is_clean_exit(code, status, EXIT_CLEAN_COMMAND, NULL))
992 f = SWAP_SUCCESS;
993 else if (code == CLD_EXITED)
994 f = SWAP_FAILURE_EXIT_CODE;
995 else if (code == CLD_KILLED)
996 f = SWAP_FAILURE_SIGNAL;
997 else if (code == CLD_DUMPED)
998 f = SWAP_FAILURE_CORE_DUMP;
999 else
1000 assert_not_reached("Unknown code");
1001
1002 if (s->result == SWAP_SUCCESS)
1003 s->result = f;
1004
1005 if (s->control_command) {
1006 exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status);
1007
1008 s->control_command = NULL;
1009 s->control_command_id = _SWAP_EXEC_COMMAND_INVALID;
1010 }
1011
1012 log_unit_full(u, f == SWAP_SUCCESS ? LOG_DEBUG : LOG_NOTICE, 0,
1013 "Swap process exited, code=%s status=%i", sigchld_code_to_string(code), status);
1014
1015 switch (s->state) {
1016
1017 case SWAP_ACTIVATING:
1018 case SWAP_ACTIVATING_DONE:
1019 case SWAP_ACTIVATING_SIGTERM:
1020 case SWAP_ACTIVATING_SIGKILL:
1021
1022 if (f == SWAP_SUCCESS)
1023 swap_enter_active(s, f);
1024 else
1025 swap_enter_dead(s, f);
1026 break;
1027
1028 case SWAP_DEACTIVATING:
1029 case SWAP_DEACTIVATING_SIGKILL:
1030 case SWAP_DEACTIVATING_SIGTERM:
1031
1032 swap_enter_dead(s, f);
1033 break;
1034
1035 default:
1036 assert_not_reached("Uh, control process died at wrong time.");
1037 }
1038
1039 /* Notify clients about changed exit status */
1040 unit_add_to_dbus_queue(u);
1041 }
1042
1043 static int swap_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
1044 Swap *s = SWAP(userdata);
1045
1046 assert(s);
1047 assert(s->timer_event_source == source);
1048
1049 switch (s->state) {
1050
1051 case SWAP_ACTIVATING:
1052 case SWAP_ACTIVATING_DONE:
1053 log_unit_warning(UNIT(s), "Activation timed out. Stopping.");
1054 swap_enter_signal(s, SWAP_ACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT);
1055 break;
1056
1057 case SWAP_DEACTIVATING:
1058 log_unit_warning(UNIT(s), "Deactivation timed out. Stopping.");
1059 swap_enter_signal(s, SWAP_DEACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT);
1060 break;
1061
1062 case SWAP_ACTIVATING_SIGTERM:
1063 if (s->kill_context.send_sigkill) {
1064 log_unit_warning(UNIT(s), "Activation timed out. Killing.");
1065 swap_enter_signal(s, SWAP_ACTIVATING_SIGKILL, SWAP_FAILURE_TIMEOUT);
1066 } else {
1067 log_unit_warning(UNIT(s), "Activation timed out. Skipping SIGKILL. Ignoring.");
1068 swap_enter_dead(s, SWAP_FAILURE_TIMEOUT);
1069 }
1070 break;
1071
1072 case SWAP_DEACTIVATING_SIGTERM:
1073 if (s->kill_context.send_sigkill) {
1074 log_unit_warning(UNIT(s), "Deactivation timed out. Killing.");
1075 swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, SWAP_FAILURE_TIMEOUT);
1076 } else {
1077 log_unit_warning(UNIT(s), "Deactivation timed out. Skipping SIGKILL. Ignoring.");
1078 swap_enter_dead(s, SWAP_FAILURE_TIMEOUT);
1079 }
1080 break;
1081
1082 case SWAP_ACTIVATING_SIGKILL:
1083 case SWAP_DEACTIVATING_SIGKILL:
1084 log_unit_warning(UNIT(s), "Swap process still around after SIGKILL. Ignoring.");
1085 swap_enter_dead(s, SWAP_FAILURE_TIMEOUT);
1086 break;
1087
1088 default:
1089 assert_not_reached("Timeout at wrong time.");
1090 }
1091
1092 return 0;
1093 }
1094
1095 static int swap_load_proc_swaps(Manager *m, bool set_flags) {
1096 unsigned i;
1097 int r = 0;
1098
1099 assert(m);
1100
1101 rewind(m->proc_swaps);
1102
1103 (void) fscanf(m->proc_swaps, "%*s %*s %*s %*s %*s\n");
1104
1105 for (i = 1;; i++) {
1106 _cleanup_free_ char *dev = NULL, *d = NULL;
1107 int prio = 0, k;
1108
1109 k = fscanf(m->proc_swaps,
1110 "%ms " /* device/file */
1111 "%*s " /* type of swap */
1112 "%*s " /* swap size */
1113 "%*s " /* used */
1114 "%i\n", /* priority */
1115 &dev, &prio);
1116 if (k != 2) {
1117 if (k == EOF)
1118 break;
1119
1120 log_warning("Failed to parse /proc/swaps:%u.", i);
1121 continue;
1122 }
1123
1124 if (cunescape(dev, UNESCAPE_RELAX, &d) < 0)
1125 return log_oom();
1126
1127 device_found_node(m, d, true, DEVICE_FOUND_SWAP, set_flags);
1128
1129 k = swap_process_new(m, d, prio, set_flags);
1130 if (k < 0)
1131 r = k;
1132 }
1133
1134 return r;
1135 }
1136
1137 static int swap_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
1138 Manager *m = userdata;
1139 Unit *u;
1140 int r;
1141
1142 assert(m);
1143 assert(revents & EPOLLPRI);
1144
1145 r = swap_load_proc_swaps(m, true);
1146 if (r < 0) {
1147 log_error_errno(r, "Failed to reread /proc/swaps: %m");
1148
1149 /* Reset flags, just in case, for late calls */
1150 LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) {
1151 Swap *swap = SWAP(u);
1152
1153 swap->is_active = swap->just_activated = false;
1154 }
1155
1156 return 0;
1157 }
1158
1159 manager_dispatch_load_queue(m);
1160
1161 LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) {
1162 Swap *swap = SWAP(u);
1163
1164 if (!swap->is_active) {
1165 /* This has just been deactivated */
1166
1167 swap_unset_proc_swaps(swap);
1168
1169 switch (swap->state) {
1170
1171 case SWAP_ACTIVE:
1172 swap_enter_dead(swap, SWAP_SUCCESS);
1173 break;
1174
1175 default:
1176 /* Fire again */
1177 swap_set_state(swap, swap->state);
1178 break;
1179 }
1180
1181 if (swap->what)
1182 device_found_node(m, swap->what, false, DEVICE_FOUND_SWAP, true);
1183
1184 } else if (swap->just_activated) {
1185
1186 /* New swap entry */
1187
1188 switch (swap->state) {
1189
1190 case SWAP_DEAD:
1191 case SWAP_FAILED:
1192 (void) unit_acquire_invocation_id(UNIT(swap));
1193 swap_enter_active(swap, SWAP_SUCCESS);
1194 break;
1195
1196 case SWAP_ACTIVATING:
1197 swap_set_state(swap, SWAP_ACTIVATING_DONE);
1198 break;
1199
1200 default:
1201 /* Nothing really changed, but let's
1202 * issue an notification call
1203 * nonetheless, in case somebody is
1204 * waiting for this. */
1205 swap_set_state(swap, swap->state);
1206 break;
1207 }
1208 }
1209
1210 /* Reset the flags for later calls */
1211 swap->is_active = swap->just_activated = false;
1212 }
1213
1214 return 1;
1215 }
1216
1217 static Unit *swap_following(Unit *u) {
1218 Swap *s = SWAP(u);
1219 Swap *other, *first = NULL;
1220
1221 assert(s);
1222
1223 /* If the user configured the swap through /etc/fstab or
1224 * a device unit, follow that. */
1225
1226 if (s->from_fragment)
1227 return NULL;
1228
1229 LIST_FOREACH_OTHERS(same_devnode, other, s)
1230 if (other->from_fragment)
1231 return UNIT(other);
1232
1233 /* Otherwise, make everybody follow the unit that's named after
1234 * the swap device in the kernel */
1235
1236 if (streq_ptr(s->what, s->devnode))
1237 return NULL;
1238
1239 LIST_FOREACH_AFTER(same_devnode, other, s)
1240 if (streq_ptr(other->what, other->devnode))
1241 return UNIT(other);
1242
1243 LIST_FOREACH_BEFORE(same_devnode, other, s) {
1244 if (streq_ptr(other->what, other->devnode))
1245 return UNIT(other);
1246
1247 first = other;
1248 }
1249
1250 /* Fall back to the first on the list */
1251 return UNIT(first);
1252 }
1253
1254 static int swap_following_set(Unit *u, Set **_set) {
1255 Swap *s = SWAP(u), *other;
1256 Set *set;
1257 int r;
1258
1259 assert(s);
1260 assert(_set);
1261
1262 if (LIST_JUST_US(same_devnode, s)) {
1263 *_set = NULL;
1264 return 0;
1265 }
1266
1267 set = set_new(NULL);
1268 if (!set)
1269 return -ENOMEM;
1270
1271 LIST_FOREACH_OTHERS(same_devnode, other, s) {
1272 r = set_put(set, other);
1273 if (r < 0)
1274 goto fail;
1275 }
1276
1277 *_set = set;
1278 return 1;
1279
1280 fail:
1281 set_free(set);
1282 return r;
1283 }
1284
1285 static void swap_shutdown(Manager *m) {
1286 assert(m);
1287
1288 m->swap_event_source = sd_event_source_unref(m->swap_event_source);
1289
1290 m->proc_swaps = safe_fclose(m->proc_swaps);
1291
1292 m->swaps_by_devnode = hashmap_free(m->swaps_by_devnode);
1293 }
1294
1295 static void swap_enumerate(Manager *m) {
1296 int r;
1297
1298 assert(m);
1299
1300 if (!m->proc_swaps) {
1301 m->proc_swaps = fopen("/proc/swaps", "re");
1302 if (!m->proc_swaps) {
1303 if (errno == ENOENT)
1304 log_debug("Not swap enabled, skipping enumeration");
1305 else
1306 log_error_errno(errno, "Failed to open /proc/swaps: %m");
1307
1308 return;
1309 }
1310
1311 r = sd_event_add_io(m->event, &m->swap_event_source, fileno(m->proc_swaps), EPOLLPRI, swap_dispatch_io, m);
1312 if (r < 0) {
1313 log_error_errno(r, "Failed to watch /proc/swaps: %m");
1314 goto fail;
1315 }
1316
1317 /* Dispatch this before we dispatch SIGCHLD, so that
1318 * we always get the events from /proc/swaps before
1319 * the SIGCHLD of /sbin/swapon. */
1320 r = sd_event_source_set_priority(m->swap_event_source, -10);
1321 if (r < 0) {
1322 log_error_errno(r, "Failed to change /proc/swaps priority: %m");
1323 goto fail;
1324 }
1325
1326 (void) sd_event_source_set_description(m->swap_event_source, "swap-proc");
1327 }
1328
1329 r = swap_load_proc_swaps(m, false);
1330 if (r < 0)
1331 goto fail;
1332
1333 return;
1334
1335 fail:
1336 swap_shutdown(m);
1337 }
1338
1339 int swap_process_device_new(Manager *m, struct udev_device *dev) {
1340 struct udev_list_entry *item = NULL, *first = NULL;
1341 _cleanup_free_ char *e = NULL;
1342 const char *dn;
1343 Unit *u;
1344 int r = 0;
1345
1346 assert(m);
1347 assert(dev);
1348
1349 dn = udev_device_get_devnode(dev);
1350 if (!dn)
1351 return 0;
1352
1353 r = unit_name_from_path(dn, ".swap", &e);
1354 if (r < 0)
1355 return r;
1356
1357 u = manager_get_unit(m, e);
1358 if (u)
1359 r = swap_set_devnode(SWAP(u), dn);
1360
1361 first = udev_device_get_devlinks_list_entry(dev);
1362 udev_list_entry_foreach(item, first) {
1363 _cleanup_free_ char *n = NULL;
1364 int q;
1365
1366 q = unit_name_from_path(udev_list_entry_get_name(item), ".swap", &n);
1367 if (q < 0)
1368 return q;
1369
1370 u = manager_get_unit(m, n);
1371 if (u) {
1372 q = swap_set_devnode(SWAP(u), dn);
1373 if (q < 0)
1374 r = q;
1375 }
1376 }
1377
1378 return r;
1379 }
1380
1381 int swap_process_device_remove(Manager *m, struct udev_device *dev) {
1382 const char *dn;
1383 int r = 0;
1384 Swap *s;
1385
1386 dn = udev_device_get_devnode(dev);
1387 if (!dn)
1388 return 0;
1389
1390 while ((s = hashmap_get(m->swaps_by_devnode, dn))) {
1391 int q;
1392
1393 q = swap_set_devnode(s, NULL);
1394 if (q < 0)
1395 r = q;
1396 }
1397
1398 return r;
1399 }
1400
1401 static void swap_reset_failed(Unit *u) {
1402 Swap *s = SWAP(u);
1403
1404 assert(s);
1405
1406 if (s->state == SWAP_FAILED)
1407 swap_set_state(s, SWAP_DEAD);
1408
1409 s->result = SWAP_SUCCESS;
1410 }
1411
1412 static int swap_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) {
1413 return unit_kill_common(u, who, signo, -1, SWAP(u)->control_pid, error);
1414 }
1415
1416 static int swap_get_timeout(Unit *u, usec_t *timeout) {
1417 Swap *s = SWAP(u);
1418 usec_t t;
1419 int r;
1420
1421 if (!s->timer_event_source)
1422 return 0;
1423
1424 r = sd_event_source_get_time(s->timer_event_source, &t);
1425 if (r < 0)
1426 return r;
1427 if (t == USEC_INFINITY)
1428 return 0;
1429
1430 *timeout = t;
1431 return 1;
1432 }
1433
1434 static bool swap_supported(void) {
1435 static int supported = -1;
1436
1437 /* If swap support is not available in the kernel, or we are
1438 * running in a container we don't support swap units, and any
1439 * attempts to starting one should fail immediately. */
1440
1441 if (supported < 0)
1442 supported =
1443 access("/proc/swaps", F_OK) >= 0 &&
1444 detect_container() <= 0;
1445
1446 return supported;
1447 }
1448
1449 static int swap_control_pid(Unit *u) {
1450 Swap *s = SWAP(u);
1451
1452 assert(s);
1453
1454 return s->control_pid;
1455 }
1456
1457 static const char* const swap_exec_command_table[_SWAP_EXEC_COMMAND_MAX] = {
1458 [SWAP_EXEC_ACTIVATE] = "ExecActivate",
1459 [SWAP_EXEC_DEACTIVATE] = "ExecDeactivate",
1460 };
1461
1462 DEFINE_STRING_TABLE_LOOKUP(swap_exec_command, SwapExecCommand);
1463
1464 static const char* const swap_result_table[_SWAP_RESULT_MAX] = {
1465 [SWAP_SUCCESS] = "success",
1466 [SWAP_FAILURE_RESOURCES] = "resources",
1467 [SWAP_FAILURE_TIMEOUT] = "timeout",
1468 [SWAP_FAILURE_EXIT_CODE] = "exit-code",
1469 [SWAP_FAILURE_SIGNAL] = "signal",
1470 [SWAP_FAILURE_CORE_DUMP] = "core-dump",
1471 [SWAP_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
1472 };
1473
1474 DEFINE_STRING_TABLE_LOOKUP(swap_result, SwapResult);
1475
1476 const UnitVTable swap_vtable = {
1477 .object_size = sizeof(Swap),
1478 .exec_context_offset = offsetof(Swap, exec_context),
1479 .cgroup_context_offset = offsetof(Swap, cgroup_context),
1480 .kill_context_offset = offsetof(Swap, kill_context),
1481 .exec_runtime_offset = offsetof(Swap, exec_runtime),
1482 .dynamic_creds_offset = offsetof(Swap, dynamic_creds),
1483
1484 .sections =
1485 "Unit\0"
1486 "Swap\0"
1487 "Install\0",
1488 .private_section = "Swap",
1489
1490 .init = swap_init,
1491 .load = swap_load,
1492 .done = swap_done,
1493
1494 .coldplug = swap_coldplug,
1495
1496 .dump = swap_dump,
1497
1498 .start = swap_start,
1499 .stop = swap_stop,
1500
1501 .kill = swap_kill,
1502
1503 .get_timeout = swap_get_timeout,
1504
1505 .serialize = swap_serialize,
1506 .deserialize_item = swap_deserialize_item,
1507
1508 .active_state = swap_active_state,
1509 .sub_state_to_string = swap_sub_state_to_string,
1510
1511 .check_gc = swap_check_gc,
1512
1513 .sigchld_event = swap_sigchld_event,
1514
1515 .reset_failed = swap_reset_failed,
1516
1517 .control_pid = swap_control_pid,
1518
1519 .bus_vtable = bus_swap_vtable,
1520 .bus_set_property = bus_swap_set_property,
1521 .bus_commit_properties = bus_swap_commit_properties,
1522
1523 .following = swap_following,
1524 .following_set = swap_following_set,
1525
1526 .enumerate = swap_enumerate,
1527 .shutdown = swap_shutdown,
1528 .supported = swap_supported,
1529
1530 .status_message_formats = {
1531 .starting_stopping = {
1532 [0] = "Activating swap %s...",
1533 [1] = "Deactivating swap %s...",
1534 },
1535 .finished_start_job = {
1536 [JOB_DONE] = "Activated swap %s.",
1537 [JOB_FAILED] = "Failed to activate swap %s.",
1538 [JOB_TIMEOUT] = "Timed out activating swap %s.",
1539 },
1540 .finished_stop_job = {
1541 [JOB_DONE] = "Deactivated swap %s.",
1542 [JOB_FAILED] = "Failed deactivating swap %s.",
1543 [JOB_TIMEOUT] = "Timed out deactivating swap %s.",
1544 },
1545 },
1546 };
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