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Merge pull request #4348 from poettering/docfixes
[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 "formats-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 u = unit_new(m, sizeof(Swap));
385 if (!u)
386 return log_oom();
387
388 r = unit_add_name(u, e);
389 if (r < 0)
390 goto fail;
391
392 SWAP(u)->what = strdup(what);
393 if (!SWAP(u)->what) {
394 r = -ENOMEM;
395 goto fail;
396 }
397
398 unit_add_to_load_queue(u);
399 } else
400 delete = false;
401
402 p = &SWAP(u)->parameters_proc_swaps;
403
404 if (!p->what) {
405 p->what = strdup(what_proc_swaps);
406 if (!p->what) {
407 r = -ENOMEM;
408 goto fail;
409 }
410 }
411
412 if (set_flags) {
413 SWAP(u)->is_active = true;
414 SWAP(u)->just_activated = !SWAP(u)->from_proc_swaps;
415 }
416
417 SWAP(u)->from_proc_swaps = true;
418
419 p->priority = priority;
420
421 unit_add_to_dbus_queue(u);
422 return 0;
423
424 fail:
425 log_unit_warning_errno(u, r, "Failed to load swap unit: %m");
426
427 if (delete && u)
428 unit_free(u);
429
430 return r;
431 }
432
433 static int swap_process_new(Manager *m, const char *device, int prio, bool set_flags) {
434 _cleanup_udev_device_unref_ struct udev_device *d = NULL;
435 struct udev_list_entry *item = NULL, *first = NULL;
436 const char *dn;
437 struct stat st;
438 int r;
439
440 assert(m);
441
442 r = swap_setup_unit(m, device, device, prio, set_flags);
443 if (r < 0)
444 return r;
445
446 /* If this is a block device, then let's add duplicates for
447 * all other names of this block device */
448 if (stat(device, &st) < 0 || !S_ISBLK(st.st_mode))
449 return 0;
450
451 d = udev_device_new_from_devnum(m->udev, 'b', st.st_rdev);
452 if (!d)
453 return 0;
454
455 /* Add the main device node */
456 dn = udev_device_get_devnode(d);
457 if (dn && !streq(dn, device))
458 swap_setup_unit(m, dn, device, prio, set_flags);
459
460 /* Add additional units for all symlinks */
461 first = udev_device_get_devlinks_list_entry(d);
462 udev_list_entry_foreach(item, first) {
463 const char *p;
464
465 /* Don't bother with the /dev/block links */
466 p = udev_list_entry_get_name(item);
467
468 if (streq(p, device))
469 continue;
470
471 if (path_startswith(p, "/dev/block/"))
472 continue;
473
474 if (stat(p, &st) >= 0)
475 if (!S_ISBLK(st.st_mode) ||
476 st.st_rdev != udev_device_get_devnum(d))
477 continue;
478
479 swap_setup_unit(m, p, device, prio, set_flags);
480 }
481
482 return r;
483 }
484
485 static void swap_set_state(Swap *s, SwapState state) {
486 SwapState old_state;
487 Swap *other;
488
489 assert(s);
490
491 old_state = s->state;
492 s->state = state;
493
494 if (state != SWAP_ACTIVATING &&
495 state != SWAP_ACTIVATING_SIGTERM &&
496 state != SWAP_ACTIVATING_SIGKILL &&
497 state != SWAP_ACTIVATING_DONE &&
498 state != SWAP_DEACTIVATING &&
499 state != SWAP_DEACTIVATING_SIGTERM &&
500 state != SWAP_DEACTIVATING_SIGKILL) {
501 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
502 swap_unwatch_control_pid(s);
503 s->control_command = NULL;
504 s->control_command_id = _SWAP_EXEC_COMMAND_INVALID;
505 }
506
507 if (state != old_state)
508 log_unit_debug(UNIT(s), "Changed %s -> %s", swap_state_to_string(old_state), swap_state_to_string(state));
509
510 unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], true);
511
512 /* If there other units for the same device node have a job
513 queued it might be worth checking again if it is runnable
514 now. This is necessary, since swap_start() refuses
515 operation with EAGAIN if there's already another job for
516 the same device node queued. */
517 LIST_FOREACH_OTHERS(same_devnode, other, s)
518 if (UNIT(other)->job)
519 job_add_to_run_queue(UNIT(other)->job);
520 }
521
522 static int swap_coldplug(Unit *u) {
523 Swap *s = SWAP(u);
524 SwapState new_state = SWAP_DEAD;
525 int r;
526
527 assert(s);
528 assert(s->state == SWAP_DEAD);
529
530 if (s->deserialized_state != s->state)
531 new_state = s->deserialized_state;
532 else if (s->from_proc_swaps)
533 new_state = SWAP_ACTIVE;
534
535 if (new_state == s->state)
536 return 0;
537
538 if (s->control_pid > 0 &&
539 pid_is_unwaited(s->control_pid) &&
540 IN_SET(new_state,
541 SWAP_ACTIVATING,
542 SWAP_ACTIVATING_SIGTERM,
543 SWAP_ACTIVATING_SIGKILL,
544 SWAP_ACTIVATING_DONE,
545 SWAP_DEACTIVATING,
546 SWAP_DEACTIVATING_SIGTERM,
547 SWAP_DEACTIVATING_SIGKILL)) {
548
549 r = unit_watch_pid(UNIT(s), s->control_pid);
550 if (r < 0)
551 return r;
552
553 r = swap_arm_timer(s, usec_add(u->state_change_timestamp.monotonic, s->timeout_usec));
554 if (r < 0)
555 return r;
556 }
557
558 if (!IN_SET(new_state, SWAP_DEAD, SWAP_FAILED))
559 (void) unit_setup_dynamic_creds(u);
560
561 swap_set_state(s, new_state);
562 return 0;
563 }
564
565 static void swap_dump(Unit *u, FILE *f, const char *prefix) {
566 Swap *s = SWAP(u);
567 SwapParameters *p;
568
569 assert(s);
570 assert(f);
571
572 if (s->from_proc_swaps)
573 p = &s->parameters_proc_swaps;
574 else if (s->from_fragment)
575 p = &s->parameters_fragment;
576 else
577 p = NULL;
578
579 fprintf(f,
580 "%sSwap State: %s\n"
581 "%sResult: %s\n"
582 "%sWhat: %s\n"
583 "%sFrom /proc/swaps: %s\n"
584 "%sFrom fragment: %s\n",
585 prefix, swap_state_to_string(s->state),
586 prefix, swap_result_to_string(s->result),
587 prefix, s->what,
588 prefix, yes_no(s->from_proc_swaps),
589 prefix, yes_no(s->from_fragment));
590
591 if (s->devnode)
592 fprintf(f, "%sDevice Node: %s\n", prefix, s->devnode);
593
594 if (p)
595 fprintf(f,
596 "%sPriority: %i\n"
597 "%sOptions: %s\n",
598 prefix, p->priority,
599 prefix, strempty(p->options));
600
601 if (s->control_pid > 0)
602 fprintf(f,
603 "%sControl PID: "PID_FMT"\n",
604 prefix, s->control_pid);
605
606 exec_context_dump(&s->exec_context, f, prefix);
607 kill_context_dump(&s->kill_context, f, prefix);
608 }
609
610 static int swap_spawn(Swap *s, ExecCommand *c, pid_t *_pid) {
611 pid_t pid;
612 int r;
613 ExecParameters exec_params = {
614 .flags = EXEC_APPLY_PERMISSIONS|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN,
615 .stdin_fd = -1,
616 .stdout_fd = -1,
617 .stderr_fd = -1,
618 };
619
620 assert(s);
621 assert(c);
622 assert(_pid);
623
624 (void) unit_realize_cgroup(UNIT(s));
625 if (s->reset_cpu_usage) {
626 (void) unit_reset_cpu_usage(UNIT(s));
627 s->reset_cpu_usage = false;
628 }
629
630 r = unit_setup_exec_runtime(UNIT(s));
631 if (r < 0)
632 goto fail;
633
634 r = unit_setup_dynamic_creds(UNIT(s));
635 if (r < 0)
636 return r;
637
638 r = swap_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
639 if (r < 0)
640 goto fail;
641
642 exec_params.environment = UNIT(s)->manager->environment;
643 exec_params.flags |= UNIT(s)->manager->confirm_spawn ? EXEC_CONFIRM_SPAWN : 0;
644 exec_params.cgroup_supported = UNIT(s)->manager->cgroup_supported;
645 exec_params.cgroup_path = UNIT(s)->cgroup_path;
646 exec_params.cgroup_delegate = s->cgroup_context.delegate;
647 exec_params.runtime_prefix = manager_get_runtime_prefix(UNIT(s)->manager);
648
649 r = exec_spawn(UNIT(s),
650 c,
651 &s->exec_context,
652 &exec_params,
653 s->exec_runtime,
654 &s->dynamic_creds,
655 &pid);
656 if (r < 0)
657 goto fail;
658
659 r = unit_watch_pid(UNIT(s), pid);
660 if (r < 0)
661 /* FIXME: we need to do something here */
662 goto fail;
663
664 *_pid = pid;
665
666 return 0;
667
668 fail:
669 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
670 return r;
671 }
672
673 static void swap_enter_dead(Swap *s, SwapResult f) {
674 assert(s);
675
676 if (s->result == SWAP_SUCCESS)
677 s->result = f;
678
679 swap_set_state(s, s->result != SWAP_SUCCESS ? SWAP_FAILED : SWAP_DEAD);
680
681 exec_runtime_destroy(s->exec_runtime);
682 s->exec_runtime = exec_runtime_unref(s->exec_runtime);
683
684 exec_context_destroy_runtime_directory(&s->exec_context, manager_get_runtime_prefix(UNIT(s)->manager));
685
686 unit_unref_uid_gid(UNIT(s), true);
687
688 dynamic_creds_destroy(&s->dynamic_creds);
689 }
690
691 static void swap_enter_active(Swap *s, SwapResult f) {
692 assert(s);
693
694 if (s->result == SWAP_SUCCESS)
695 s->result = f;
696
697 swap_set_state(s, SWAP_ACTIVE);
698 }
699
700 static void swap_enter_signal(Swap *s, SwapState state, SwapResult f) {
701 int r;
702
703 assert(s);
704
705 if (s->result == SWAP_SUCCESS)
706 s->result = f;
707
708 r = unit_kill_context(
709 UNIT(s),
710 &s->kill_context,
711 (state != SWAP_ACTIVATING_SIGTERM && state != SWAP_DEACTIVATING_SIGTERM) ?
712 KILL_KILL : KILL_TERMINATE,
713 -1,
714 s->control_pid,
715 false);
716 if (r < 0)
717 goto fail;
718
719 if (r > 0) {
720 r = swap_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec));
721 if (r < 0)
722 goto fail;
723
724 swap_set_state(s, state);
725 } else if (state == SWAP_ACTIVATING_SIGTERM)
726 swap_enter_signal(s, SWAP_ACTIVATING_SIGKILL, SWAP_SUCCESS);
727 else if (state == SWAP_DEACTIVATING_SIGTERM)
728 swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, SWAP_SUCCESS);
729 else
730 swap_enter_dead(s, SWAP_SUCCESS);
731
732 return;
733
734 fail:
735 log_unit_warning_errno(UNIT(s), r, "Failed to kill processes: %m");
736 swap_enter_dead(s, SWAP_FAILURE_RESOURCES);
737 }
738
739 static void swap_enter_activating(Swap *s) {
740 _cleanup_free_ char *opts = NULL;
741 int r;
742
743 assert(s);
744
745 s->control_command_id = SWAP_EXEC_ACTIVATE;
746 s->control_command = s->exec_command + SWAP_EXEC_ACTIVATE;
747
748 if (s->from_fragment) {
749 int priority = -1;
750
751 r = fstab_find_pri(s->parameters_fragment.options, &priority);
752 if (r < 0)
753 log_warning_errno(r, "Failed to parse swap priority \"%s\", ignoring: %m", s->parameters_fragment.options);
754 else if (r == 1 && s->parameters_fragment.priority >= 0)
755 log_warning("Duplicate swap priority configuration by Priority and Options fields.");
756
757 if (r <= 0 && s->parameters_fragment.priority >= 0) {
758 if (s->parameters_fragment.options)
759 r = asprintf(&opts, "%s,pri=%i", s->parameters_fragment.options, s->parameters_fragment.priority);
760 else
761 r = asprintf(&opts, "pri=%i", s->parameters_fragment.priority);
762 if (r < 0)
763 goto fail;
764 }
765 }
766
767 r = exec_command_set(s->control_command, "/sbin/swapon", NULL);
768 if (r < 0)
769 goto fail;
770
771 if (s->parameters_fragment.options || opts) {
772 r = exec_command_append(s->control_command, "-o",
773 opts ? : s->parameters_fragment.options, NULL);
774 if (r < 0)
775 goto fail;
776 }
777
778 r = exec_command_append(s->control_command, s->what, NULL);
779 if (r < 0)
780 goto fail;
781
782 swap_unwatch_control_pid(s);
783
784 r = swap_spawn(s, s->control_command, &s->control_pid);
785 if (r < 0)
786 goto fail;
787
788 swap_set_state(s, SWAP_ACTIVATING);
789
790 return;
791
792 fail:
793 log_unit_warning_errno(UNIT(s), r, "Failed to run 'swapon' task: %m");
794 swap_enter_dead(s, SWAP_FAILURE_RESOURCES);
795 }
796
797 static void swap_enter_deactivating(Swap *s) {
798 int r;
799
800 assert(s);
801
802 s->control_command_id = SWAP_EXEC_DEACTIVATE;
803 s->control_command = s->exec_command + SWAP_EXEC_DEACTIVATE;
804
805 r = exec_command_set(s->control_command,
806 "/sbin/swapoff",
807 s->what,
808 NULL);
809 if (r < 0)
810 goto fail;
811
812 swap_unwatch_control_pid(s);
813
814 r = swap_spawn(s, s->control_command, &s->control_pid);
815 if (r < 0)
816 goto fail;
817
818 swap_set_state(s, SWAP_DEACTIVATING);
819
820 return;
821
822 fail:
823 log_unit_warning_errno(UNIT(s), r, "Failed to run 'swapoff' task: %m");
824 swap_enter_active(s, SWAP_FAILURE_RESOURCES);
825 }
826
827 static int swap_start(Unit *u) {
828 Swap *s = SWAP(u), *other;
829 int r;
830
831 assert(s);
832
833 /* We cannot fulfill this request right now, try again later
834 * please! */
835
836 if (s->state == SWAP_DEACTIVATING ||
837 s->state == SWAP_DEACTIVATING_SIGTERM ||
838 s->state == SWAP_DEACTIVATING_SIGKILL ||
839 s->state == SWAP_ACTIVATING_SIGTERM ||
840 s->state == SWAP_ACTIVATING_SIGKILL)
841 return -EAGAIN;
842
843 if (s->state == SWAP_ACTIVATING)
844 return 0;
845
846 assert(s->state == SWAP_DEAD || s->state == SWAP_FAILED);
847
848 if (detect_container() > 0)
849 return -EPERM;
850
851 /* If there's a job for another swap unit for the same node
852 * running, then let's not dispatch this one for now, and wait
853 * until that other job has finished. */
854 LIST_FOREACH_OTHERS(same_devnode, other, s)
855 if (UNIT(other)->job && UNIT(other)->job->state == JOB_RUNNING)
856 return -EAGAIN;
857
858 r = unit_start_limit_test(u);
859 if (r < 0) {
860 swap_enter_dead(s, SWAP_FAILURE_START_LIMIT_HIT);
861 return r;
862 }
863
864 r = unit_acquire_invocation_id(u);
865 if (r < 0)
866 return r;
867
868 s->result = SWAP_SUCCESS;
869 s->reset_cpu_usage = true;
870
871 swap_enter_activating(s);
872 return 1;
873 }
874
875 static int swap_stop(Unit *u) {
876 Swap *s = SWAP(u);
877
878 assert(s);
879
880 if (s->state == SWAP_DEACTIVATING ||
881 s->state == SWAP_DEACTIVATING_SIGTERM ||
882 s->state == SWAP_DEACTIVATING_SIGKILL ||
883 s->state == SWAP_ACTIVATING_SIGTERM ||
884 s->state == SWAP_ACTIVATING_SIGKILL)
885 return 0;
886
887 assert(s->state == SWAP_ACTIVATING ||
888 s->state == SWAP_ACTIVATING_DONE ||
889 s->state == SWAP_ACTIVE);
890
891 if (detect_container() > 0)
892 return -EPERM;
893
894 swap_enter_deactivating(s);
895 return 1;
896 }
897
898 static int swap_serialize(Unit *u, FILE *f, FDSet *fds) {
899 Swap *s = SWAP(u);
900
901 assert(s);
902 assert(f);
903 assert(fds);
904
905 unit_serialize_item(u, f, "state", swap_state_to_string(s->state));
906 unit_serialize_item(u, f, "result", swap_result_to_string(s->result));
907
908 if (s->control_pid > 0)
909 unit_serialize_item_format(u, f, "control-pid", PID_FMT, s->control_pid);
910
911 if (s->control_command_id >= 0)
912 unit_serialize_item(u, f, "control-command", swap_exec_command_to_string(s->control_command_id));
913
914 return 0;
915 }
916
917 static int swap_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
918 Swap *s = SWAP(u);
919
920 assert(s);
921 assert(fds);
922
923 if (streq(key, "state")) {
924 SwapState state;
925
926 state = swap_state_from_string(value);
927 if (state < 0)
928 log_unit_debug(u, "Failed to parse state value: %s", value);
929 else
930 s->deserialized_state = state;
931 } else if (streq(key, "result")) {
932 SwapResult f;
933
934 f = swap_result_from_string(value);
935 if (f < 0)
936 log_unit_debug(u, "Failed to parse result value: %s", value);
937 else if (f != SWAP_SUCCESS)
938 s->result = f;
939 } else if (streq(key, "control-pid")) {
940 pid_t pid;
941
942 if (parse_pid(value, &pid) < 0)
943 log_unit_debug(u, "Failed to parse control-pid value: %s", value);
944 else
945 s->control_pid = pid;
946
947 } else if (streq(key, "control-command")) {
948 SwapExecCommand id;
949
950 id = swap_exec_command_from_string(value);
951 if (id < 0)
952 log_unit_debug(u, "Failed to parse exec-command value: %s", value);
953 else {
954 s->control_command_id = id;
955 s->control_command = s->exec_command + id;
956 }
957 } else
958 log_unit_debug(u, "Unknown serialization key: %s", key);
959
960 return 0;
961 }
962
963 _pure_ static UnitActiveState swap_active_state(Unit *u) {
964 assert(u);
965
966 return state_translation_table[SWAP(u)->state];
967 }
968
969 _pure_ static const char *swap_sub_state_to_string(Unit *u) {
970 assert(u);
971
972 return swap_state_to_string(SWAP(u)->state);
973 }
974
975 _pure_ static bool swap_check_gc(Unit *u) {
976 Swap *s = SWAP(u);
977
978 assert(s);
979
980 return s->from_proc_swaps;
981 }
982
983 static void swap_sigchld_event(Unit *u, pid_t pid, int code, int status) {
984 Swap *s = SWAP(u);
985 SwapResult f;
986
987 assert(s);
988 assert(pid >= 0);
989
990 if (pid != s->control_pid)
991 return;
992
993 s->control_pid = 0;
994
995 if (is_clean_exit(code, status, EXIT_CLEAN_COMMAND, NULL))
996 f = SWAP_SUCCESS;
997 else if (code == CLD_EXITED)
998 f = SWAP_FAILURE_EXIT_CODE;
999 else if (code == CLD_KILLED)
1000 f = SWAP_FAILURE_SIGNAL;
1001 else if (code == CLD_DUMPED)
1002 f = SWAP_FAILURE_CORE_DUMP;
1003 else
1004 assert_not_reached("Unknown code");
1005
1006 if (s->result == SWAP_SUCCESS)
1007 s->result = f;
1008
1009 if (s->control_command) {
1010 exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status);
1011
1012 s->control_command = NULL;
1013 s->control_command_id = _SWAP_EXEC_COMMAND_INVALID;
1014 }
1015
1016 log_unit_full(u, f == SWAP_SUCCESS ? LOG_DEBUG : LOG_NOTICE, 0,
1017 "Swap process exited, code=%s status=%i", sigchld_code_to_string(code), status);
1018
1019 switch (s->state) {
1020
1021 case SWAP_ACTIVATING:
1022 case SWAP_ACTIVATING_DONE:
1023 case SWAP_ACTIVATING_SIGTERM:
1024 case SWAP_ACTIVATING_SIGKILL:
1025
1026 if (f == SWAP_SUCCESS)
1027 swap_enter_active(s, f);
1028 else
1029 swap_enter_dead(s, f);
1030 break;
1031
1032 case SWAP_DEACTIVATING:
1033 case SWAP_DEACTIVATING_SIGKILL:
1034 case SWAP_DEACTIVATING_SIGTERM:
1035
1036 swap_enter_dead(s, f);
1037 break;
1038
1039 default:
1040 assert_not_reached("Uh, control process died at wrong time.");
1041 }
1042
1043 /* Notify clients about changed exit status */
1044 unit_add_to_dbus_queue(u);
1045 }
1046
1047 static int swap_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
1048 Swap *s = SWAP(userdata);
1049
1050 assert(s);
1051 assert(s->timer_event_source == source);
1052
1053 switch (s->state) {
1054
1055 case SWAP_ACTIVATING:
1056 case SWAP_ACTIVATING_DONE:
1057 log_unit_warning(UNIT(s), "Activation timed out. Stopping.");
1058 swap_enter_signal(s, SWAP_ACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT);
1059 break;
1060
1061 case SWAP_DEACTIVATING:
1062 log_unit_warning(UNIT(s), "Deactivation timed out. Stopping.");
1063 swap_enter_signal(s, SWAP_DEACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT);
1064 break;
1065
1066 case SWAP_ACTIVATING_SIGTERM:
1067 if (s->kill_context.send_sigkill) {
1068 log_unit_warning(UNIT(s), "Activation timed out. Killing.");
1069 swap_enter_signal(s, SWAP_ACTIVATING_SIGKILL, SWAP_FAILURE_TIMEOUT);
1070 } else {
1071 log_unit_warning(UNIT(s), "Activation timed out. Skipping SIGKILL. Ignoring.");
1072 swap_enter_dead(s, SWAP_FAILURE_TIMEOUT);
1073 }
1074 break;
1075
1076 case SWAP_DEACTIVATING_SIGTERM:
1077 if (s->kill_context.send_sigkill) {
1078 log_unit_warning(UNIT(s), "Deactivation timed out. Killing.");
1079 swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, SWAP_FAILURE_TIMEOUT);
1080 } else {
1081 log_unit_warning(UNIT(s), "Deactivation timed out. Skipping SIGKILL. Ignoring.");
1082 swap_enter_dead(s, SWAP_FAILURE_TIMEOUT);
1083 }
1084 break;
1085
1086 case SWAP_ACTIVATING_SIGKILL:
1087 case SWAP_DEACTIVATING_SIGKILL:
1088 log_unit_warning(UNIT(s), "Swap process still around after SIGKILL. Ignoring.");
1089 swap_enter_dead(s, SWAP_FAILURE_TIMEOUT);
1090 break;
1091
1092 default:
1093 assert_not_reached("Timeout at wrong time.");
1094 }
1095
1096 return 0;
1097 }
1098
1099 static int swap_load_proc_swaps(Manager *m, bool set_flags) {
1100 unsigned i;
1101 int r = 0;
1102
1103 assert(m);
1104
1105 rewind(m->proc_swaps);
1106
1107 (void) fscanf(m->proc_swaps, "%*s %*s %*s %*s %*s\n");
1108
1109 for (i = 1;; i++) {
1110 _cleanup_free_ char *dev = NULL, *d = NULL;
1111 int prio = 0, k;
1112
1113 k = fscanf(m->proc_swaps,
1114 "%ms " /* device/file */
1115 "%*s " /* type of swap */
1116 "%*s " /* swap size */
1117 "%*s " /* used */
1118 "%i\n", /* priority */
1119 &dev, &prio);
1120 if (k != 2) {
1121 if (k == EOF)
1122 break;
1123
1124 log_warning("Failed to parse /proc/swaps:%u.", i);
1125 continue;
1126 }
1127
1128 if (cunescape(dev, UNESCAPE_RELAX, &d) < 0)
1129 return log_oom();
1130
1131 device_found_node(m, d, true, DEVICE_FOUND_SWAP, set_flags);
1132
1133 k = swap_process_new(m, d, prio, set_flags);
1134 if (k < 0)
1135 r = k;
1136 }
1137
1138 return r;
1139 }
1140
1141 static int swap_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
1142 Manager *m = userdata;
1143 Unit *u;
1144 int r;
1145
1146 assert(m);
1147 assert(revents & EPOLLPRI);
1148
1149 r = swap_load_proc_swaps(m, true);
1150 if (r < 0) {
1151 log_error_errno(r, "Failed to reread /proc/swaps: %m");
1152
1153 /* Reset flags, just in case, for late calls */
1154 LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) {
1155 Swap *swap = SWAP(u);
1156
1157 swap->is_active = swap->just_activated = false;
1158 }
1159
1160 return 0;
1161 }
1162
1163 manager_dispatch_load_queue(m);
1164
1165 LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) {
1166 Swap *swap = SWAP(u);
1167
1168 if (!swap->is_active) {
1169 /* This has just been deactivated */
1170
1171 swap_unset_proc_swaps(swap);
1172
1173 switch (swap->state) {
1174
1175 case SWAP_ACTIVE:
1176 swap_enter_dead(swap, SWAP_SUCCESS);
1177 break;
1178
1179 default:
1180 /* Fire again */
1181 swap_set_state(swap, swap->state);
1182 break;
1183 }
1184
1185 if (swap->what)
1186 device_found_node(m, swap->what, false, DEVICE_FOUND_SWAP, true);
1187
1188 } else if (swap->just_activated) {
1189
1190 /* New swap entry */
1191
1192 switch (swap->state) {
1193
1194 case SWAP_DEAD:
1195 case SWAP_FAILED:
1196 (void) unit_acquire_invocation_id(UNIT(swap));
1197 swap_enter_active(swap, SWAP_SUCCESS);
1198 break;
1199
1200 case SWAP_ACTIVATING:
1201 swap_set_state(swap, SWAP_ACTIVATING_DONE);
1202 break;
1203
1204 default:
1205 /* Nothing really changed, but let's
1206 * issue an notification call
1207 * nonetheless, in case somebody is
1208 * waiting for this. */
1209 swap_set_state(swap, swap->state);
1210 break;
1211 }
1212 }
1213
1214 /* Reset the flags for later calls */
1215 swap->is_active = swap->just_activated = false;
1216 }
1217
1218 return 1;
1219 }
1220
1221 static Unit *swap_following(Unit *u) {
1222 Swap *s = SWAP(u);
1223 Swap *other, *first = NULL;
1224
1225 assert(s);
1226
1227 /* If the user configured the swap through /etc/fstab or
1228 * a device unit, follow that. */
1229
1230 if (s->from_fragment)
1231 return NULL;
1232
1233 LIST_FOREACH_OTHERS(same_devnode, other, s)
1234 if (other->from_fragment)
1235 return UNIT(other);
1236
1237 /* Otherwise, make everybody follow the unit that's named after
1238 * the swap device in the kernel */
1239
1240 if (streq_ptr(s->what, s->devnode))
1241 return NULL;
1242
1243 LIST_FOREACH_AFTER(same_devnode, other, s)
1244 if (streq_ptr(other->what, other->devnode))
1245 return UNIT(other);
1246
1247 LIST_FOREACH_BEFORE(same_devnode, other, s) {
1248 if (streq_ptr(other->what, other->devnode))
1249 return UNIT(other);
1250
1251 first = other;
1252 }
1253
1254 /* Fall back to the first on the list */
1255 return UNIT(first);
1256 }
1257
1258 static int swap_following_set(Unit *u, Set **_set) {
1259 Swap *s = SWAP(u), *other;
1260 Set *set;
1261 int r;
1262
1263 assert(s);
1264 assert(_set);
1265
1266 if (LIST_JUST_US(same_devnode, s)) {
1267 *_set = NULL;
1268 return 0;
1269 }
1270
1271 set = set_new(NULL);
1272 if (!set)
1273 return -ENOMEM;
1274
1275 LIST_FOREACH_OTHERS(same_devnode, other, s) {
1276 r = set_put(set, other);
1277 if (r < 0)
1278 goto fail;
1279 }
1280
1281 *_set = set;
1282 return 1;
1283
1284 fail:
1285 set_free(set);
1286 return r;
1287 }
1288
1289 static void swap_shutdown(Manager *m) {
1290 assert(m);
1291
1292 m->swap_event_source = sd_event_source_unref(m->swap_event_source);
1293
1294 m->proc_swaps = safe_fclose(m->proc_swaps);
1295
1296 m->swaps_by_devnode = hashmap_free(m->swaps_by_devnode);
1297 }
1298
1299 static void swap_enumerate(Manager *m) {
1300 int r;
1301
1302 assert(m);
1303
1304 if (!m->proc_swaps) {
1305 m->proc_swaps = fopen("/proc/swaps", "re");
1306 if (!m->proc_swaps) {
1307 if (errno == ENOENT)
1308 log_debug("Not swap enabled, skipping enumeration");
1309 else
1310 log_error_errno(errno, "Failed to open /proc/swaps: %m");
1311
1312 return;
1313 }
1314
1315 r = sd_event_add_io(m->event, &m->swap_event_source, fileno(m->proc_swaps), EPOLLPRI, swap_dispatch_io, m);
1316 if (r < 0) {
1317 log_error_errno(r, "Failed to watch /proc/swaps: %m");
1318 goto fail;
1319 }
1320
1321 /* Dispatch this before we dispatch SIGCHLD, so that
1322 * we always get the events from /proc/swaps before
1323 * the SIGCHLD of /sbin/swapon. */
1324 r = sd_event_source_set_priority(m->swap_event_source, -10);
1325 if (r < 0) {
1326 log_error_errno(r, "Failed to change /proc/swaps priority: %m");
1327 goto fail;
1328 }
1329
1330 (void) sd_event_source_set_description(m->swap_event_source, "swap-proc");
1331 }
1332
1333 r = swap_load_proc_swaps(m, false);
1334 if (r < 0)
1335 goto fail;
1336
1337 return;
1338
1339 fail:
1340 swap_shutdown(m);
1341 }
1342
1343 int swap_process_device_new(Manager *m, struct udev_device *dev) {
1344 struct udev_list_entry *item = NULL, *first = NULL;
1345 _cleanup_free_ char *e = NULL;
1346 const char *dn;
1347 Swap *s;
1348 int r = 0;
1349
1350 assert(m);
1351 assert(dev);
1352
1353 dn = udev_device_get_devnode(dev);
1354 if (!dn)
1355 return 0;
1356
1357 r = unit_name_from_path(dn, ".swap", &e);
1358 if (r < 0)
1359 return r;
1360
1361 s = hashmap_get(m->units, e);
1362 if (s)
1363 r = swap_set_devnode(s, dn);
1364
1365 first = udev_device_get_devlinks_list_entry(dev);
1366 udev_list_entry_foreach(item, first) {
1367 _cleanup_free_ char *n = NULL;
1368 int q;
1369
1370 q = unit_name_from_path(udev_list_entry_get_name(item), ".swap", &n);
1371 if (q < 0)
1372 return q;
1373
1374 s = hashmap_get(m->units, n);
1375 if (s) {
1376 q = swap_set_devnode(s, dn);
1377 if (q < 0)
1378 r = q;
1379 }
1380 }
1381
1382 return r;
1383 }
1384
1385 int swap_process_device_remove(Manager *m, struct udev_device *dev) {
1386 const char *dn;
1387 int r = 0;
1388 Swap *s;
1389
1390 dn = udev_device_get_devnode(dev);
1391 if (!dn)
1392 return 0;
1393
1394 while ((s = hashmap_get(m->swaps_by_devnode, dn))) {
1395 int q;
1396
1397 q = swap_set_devnode(s, NULL);
1398 if (q < 0)
1399 r = q;
1400 }
1401
1402 return r;
1403 }
1404
1405 static void swap_reset_failed(Unit *u) {
1406 Swap *s = SWAP(u);
1407
1408 assert(s);
1409
1410 if (s->state == SWAP_FAILED)
1411 swap_set_state(s, SWAP_DEAD);
1412
1413 s->result = SWAP_SUCCESS;
1414 }
1415
1416 static int swap_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) {
1417 return unit_kill_common(u, who, signo, -1, SWAP(u)->control_pid, error);
1418 }
1419
1420 static int swap_get_timeout(Unit *u, usec_t *timeout) {
1421 Swap *s = SWAP(u);
1422 usec_t t;
1423 int r;
1424
1425 if (!s->timer_event_source)
1426 return 0;
1427
1428 r = sd_event_source_get_time(s->timer_event_source, &t);
1429 if (r < 0)
1430 return r;
1431 if (t == USEC_INFINITY)
1432 return 0;
1433
1434 *timeout = t;
1435 return 1;
1436 }
1437
1438 static bool swap_supported(void) {
1439 static int supported = -1;
1440
1441 /* If swap support is not available in the kernel, or we are
1442 * running in a container we don't support swap units, and any
1443 * attempts to starting one should fail immediately. */
1444
1445 if (supported < 0)
1446 supported =
1447 access("/proc/swaps", F_OK) >= 0 &&
1448 detect_container() <= 0;
1449
1450 return supported;
1451 }
1452
1453 static int swap_control_pid(Unit *u) {
1454 Swap *s = SWAP(u);
1455
1456 assert(s);
1457
1458 return s->control_pid;
1459 }
1460
1461 static const char* const swap_exec_command_table[_SWAP_EXEC_COMMAND_MAX] = {
1462 [SWAP_EXEC_ACTIVATE] = "ExecActivate",
1463 [SWAP_EXEC_DEACTIVATE] = "ExecDeactivate",
1464 };
1465
1466 DEFINE_STRING_TABLE_LOOKUP(swap_exec_command, SwapExecCommand);
1467
1468 static const char* const swap_result_table[_SWAP_RESULT_MAX] = {
1469 [SWAP_SUCCESS] = "success",
1470 [SWAP_FAILURE_RESOURCES] = "resources",
1471 [SWAP_FAILURE_TIMEOUT] = "timeout",
1472 [SWAP_FAILURE_EXIT_CODE] = "exit-code",
1473 [SWAP_FAILURE_SIGNAL] = "signal",
1474 [SWAP_FAILURE_CORE_DUMP] = "core-dump",
1475 [SWAP_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
1476 };
1477
1478 DEFINE_STRING_TABLE_LOOKUP(swap_result, SwapResult);
1479
1480 const UnitVTable swap_vtable = {
1481 .object_size = sizeof(Swap),
1482 .exec_context_offset = offsetof(Swap, exec_context),
1483 .cgroup_context_offset = offsetof(Swap, cgroup_context),
1484 .kill_context_offset = offsetof(Swap, kill_context),
1485 .exec_runtime_offset = offsetof(Swap, exec_runtime),
1486 .dynamic_creds_offset = offsetof(Swap, dynamic_creds),
1487
1488 .sections =
1489 "Unit\0"
1490 "Swap\0"
1491 "Install\0",
1492 .private_section = "Swap",
1493
1494 .init = swap_init,
1495 .load = swap_load,
1496 .done = swap_done,
1497
1498 .coldplug = swap_coldplug,
1499
1500 .dump = swap_dump,
1501
1502 .start = swap_start,
1503 .stop = swap_stop,
1504
1505 .kill = swap_kill,
1506
1507 .get_timeout = swap_get_timeout,
1508
1509 .serialize = swap_serialize,
1510 .deserialize_item = swap_deserialize_item,
1511
1512 .active_state = swap_active_state,
1513 .sub_state_to_string = swap_sub_state_to_string,
1514
1515 .check_gc = swap_check_gc,
1516
1517 .sigchld_event = swap_sigchld_event,
1518
1519 .reset_failed = swap_reset_failed,
1520
1521 .control_pid = swap_control_pid,
1522
1523 .bus_vtable = bus_swap_vtable,
1524 .bus_set_property = bus_swap_set_property,
1525 .bus_commit_properties = bus_swap_commit_properties,
1526
1527 .following = swap_following,
1528 .following_set = swap_following_set,
1529
1530 .enumerate = swap_enumerate,
1531 .shutdown = swap_shutdown,
1532 .supported = swap_supported,
1533
1534 .status_message_formats = {
1535 .starting_stopping = {
1536 [0] = "Activating swap %s...",
1537 [1] = "Deactivating swap %s...",
1538 },
1539 .finished_start_job = {
1540 [JOB_DONE] = "Activated swap %s.",
1541 [JOB_FAILED] = "Failed to activate swap %s.",
1542 [JOB_TIMEOUT] = "Timed out activating swap %s.",
1543 },
1544 .finished_stop_job = {
1545 [JOB_DONE] = "Deactivated swap %s.",
1546 [JOB_FAILED] = "Failed deactivating swap %s.",
1547 [JOB_TIMEOUT] = "Timed out deactivating swap %s.",
1548 },
1549 },
1550 };
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