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1/* SPDX-License-Identifier: LGPL-2.1-or-later */
2
3#include <sys/socket.h>
4#include <sys/stat.h>
5#include <unistd.h>
6
7#include "sd-device.h"
8
9#include "alloc-util.h"
10#include "dbus-swap.h"
11#include "dbus-unit.h"
12#include "device.h"
13#include "device-util.h"
14#include "errno-util.h"
15#include "escape.h"
16#include "exit-status.h"
17#include "fd-util.h"
18#include "format-util.h"
19#include "fstab-util.h"
20#include "glyph-util.h"
21#include "manager.h"
22#include "path-util.h"
23#include "process-util.h"
24#include "serialize.h"
25#include "set.h"
26#include "special.h"
27#include "string-table.h"
28#include "string-util.h"
29#include "strv.h"
30#include "swap.h"
31#include "unit.h"
32#include "unit-name.h"
33#include "virt.h"
34
35static const UnitActiveState state_translation_table[_SWAP_STATE_MAX] = {
36 [SWAP_DEAD] = UNIT_INACTIVE,
37 [SWAP_ACTIVATING] = UNIT_ACTIVATING,
38 [SWAP_ACTIVATING_DONE] = UNIT_ACTIVE,
39 [SWAP_ACTIVE] = UNIT_ACTIVE,
40 [SWAP_DEACTIVATING] = UNIT_DEACTIVATING,
41 [SWAP_DEACTIVATING_SIGTERM] = UNIT_DEACTIVATING,
42 [SWAP_DEACTIVATING_SIGKILL] = UNIT_DEACTIVATING,
43 [SWAP_FAILED] = UNIT_FAILED,
44 [SWAP_CLEANING] = UNIT_MAINTENANCE,
45};
46
47static int swap_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata);
48static int swap_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata);
49static int swap_process_proc_swaps(Manager *m);
50
51static bool SWAP_STATE_WITH_PROCESS(SwapState state) {
52 return IN_SET(state,
53 SWAP_ACTIVATING,
54 SWAP_ACTIVATING_DONE,
55 SWAP_DEACTIVATING,
56 SWAP_DEACTIVATING_SIGTERM,
57 SWAP_DEACTIVATING_SIGKILL,
58 SWAP_CLEANING);
59}
60
61static UnitActiveState swap_active_state(Unit *u) {
62 assert(u);
63
64 return state_translation_table[SWAP(u)->state];
65}
66
67static const char *swap_sub_state_to_string(Unit *u) {
68 assert(u);
69
70 return swap_state_to_string(SWAP(u)->state);
71}
72
73static bool swap_may_gc(Unit *u) {
74 Swap *s = ASSERT_PTR(SWAP(u));
75
76 if (s->from_proc_swaps)
77 return false;
78
79 return true;
80}
81
82static bool swap_is_extrinsic(Unit *u) {
83 assert(SWAP(u));
84
85 return MANAGER_IS_USER(u->manager);
86}
87
88static void swap_unset_proc_swaps(Swap *s) {
89 assert(s);
90
91 if (!s->from_proc_swaps)
92 return;
93
94 s->parameters_proc_swaps.what = mfree(s->parameters_proc_swaps.what);
95 s->from_proc_swaps = false;
96}
97
98static int swap_set_devnode(Swap *s, const char *devnode) {
99 Hashmap *swaps;
100 Swap *first;
101 int r;
102
103 assert(s);
104
105 r = hashmap_ensure_allocated(&UNIT(s)->manager->swaps_by_devnode, &path_hash_ops);
106 if (r < 0)
107 return r;
108
109 swaps = UNIT(s)->manager->swaps_by_devnode;
110
111 if (s->devnode) {
112 first = hashmap_get(swaps, s->devnode);
113
114 LIST_REMOVE(same_devnode, first, s);
115 if (first)
116 hashmap_replace(swaps, first->devnode, first);
117 else
118 hashmap_remove(swaps, s->devnode);
119
120 s->devnode = mfree(s->devnode);
121 }
122
123 if (devnode) {
124 s->devnode = strdup(devnode);
125 if (!s->devnode)
126 return -ENOMEM;
127
128 first = hashmap_get(swaps, s->devnode);
129 LIST_PREPEND(same_devnode, first, s);
130
131 return hashmap_replace(swaps, first->devnode, first);
132 }
133
134 return 0;
135}
136
137static void swap_init(Unit *u) {
138 Swap *s = ASSERT_PTR(SWAP(u));
139
140 assert(u->load_state == UNIT_STUB);
141
142 s->timeout_usec = u->manager->defaults.timeout_start_usec;
143
144 s->exec_context.std_output = u->manager->defaults.std_output;
145 s->exec_context.std_error = u->manager->defaults.std_error;
146
147 s->control_pid = PIDREF_NULL;
148 s->control_command_id = _SWAP_EXEC_COMMAND_INVALID;
149
150 u->ignore_on_isolate = true;
151}
152
153static void swap_unwatch_control_pid(Swap *s) {
154 assert(s);
155 unit_unwatch_pidref_done(UNIT(s), &s->control_pid);
156}
157
158static void swap_done(Unit *u) {
159 Swap *s = ASSERT_PTR(SWAP(u));
160
161 swap_unset_proc_swaps(s);
162 swap_set_devnode(s, NULL);
163
164 s->what = mfree(s->what);
165 s->parameters_fragment.what = mfree(s->parameters_fragment.what);
166 s->parameters_fragment.options = mfree(s->parameters_fragment.options);
167
168 s->exec_runtime = exec_runtime_free(s->exec_runtime);
169
170 exec_command_done_array(s->exec_command, _SWAP_EXEC_COMMAND_MAX);
171 s->control_command = NULL;
172
173 swap_unwatch_control_pid(s);
174
175 s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source);
176}
177
178static int swap_arm_timer(Swap *s, bool relative, usec_t usec) {
179 assert(s);
180
181 return unit_arm_timer(UNIT(s), &s->timer_event_source, relative, usec, swap_dispatch_timer);
182}
183
184static SwapParameters* swap_get_parameters(Swap *s) {
185 assert(s);
186
187 if (s->from_proc_swaps)
188 return &s->parameters_proc_swaps;
189
190 if (s->from_fragment)
191 return &s->parameters_fragment;
192
193 return NULL;
194}
195
196static int swap_add_device_dependencies(Swap *s) {
197 UnitDependencyMask mask;
198 SwapParameters *p;
199 int r;
200
201 assert(s);
202
203 if (!s->what)
204 return 0;
205
206 p = swap_get_parameters(s);
207 if (!p || !p->what)
208 return 0;
209
210 mask = s->from_proc_swaps ? UNIT_DEPENDENCY_PROC_SWAP : UNIT_DEPENDENCY_FILE;
211
212 if (is_device_path(p->what)) {
213 r = unit_add_node_dependency(UNIT(s), p->what, UNIT_REQUIRES, mask);
214 if (r < 0)
215 return r;
216
217 return unit_add_blockdev_dependency(UNIT(s), p->what, mask);
218 }
219
220 /* File based swap devices need to be ordered after systemd-remount-fs.service, since they might need
221 * a writable file system. */
222 return unit_add_dependency_by_name(UNIT(s), UNIT_AFTER, SPECIAL_REMOUNT_FS_SERVICE, true, mask);
223}
224
225static int swap_add_default_dependencies(Swap *s) {
226 int r;
227
228 assert(s);
229
230 if (!UNIT(s)->default_dependencies)
231 return 0;
232
233 if (!MANAGER_IS_SYSTEM(UNIT(s)->manager))
234 return 0;
235
236 if (detect_container() > 0)
237 return 0;
238
239 /* swap units generated for the swap dev links are missing the
240 * ordering dep against the swap target. */
241 r = unit_add_dependency_by_name(UNIT(s), UNIT_BEFORE, SPECIAL_SWAP_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
242 if (r < 0)
243 return r;
244
245 return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
246}
247
248static int swap_verify(Swap *s) {
249 _cleanup_free_ char *e = NULL;
250 int r;
251
252 assert(s);
253 assert(UNIT(s)->load_state == UNIT_LOADED);
254
255 r = unit_name_from_path(s->what, ".swap", &e);
256 if (r < 0)
257 return log_unit_error_errno(UNIT(s), r, "Failed to generate unit name from path: %m");
258
259 if (!unit_has_name(UNIT(s), e))
260 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Value of What= and unit name do not match, not loading.");
261
262 return 0;
263}
264
265static int swap_load_devnode(Swap *s) {
266 _cleanup_free_ char *p = NULL;
267 struct stat st;
268 int r;
269
270 assert(s);
271
272 if (stat(s->what, &st) < 0 || !S_ISBLK(st.st_mode))
273 return 0;
274
275 r = devname_from_stat_rdev(&st, &p);
276 if (r < 0) {
277 log_unit_full_errno(UNIT(s), r == -ENOENT ? LOG_DEBUG : LOG_WARNING, r,
278 "Failed to get device node for swap %s: %m", s->what);
279 return 0;
280 }
281
282 return swap_set_devnode(s, p);
283}
284
285static int swap_add_extras(Swap *s) {
286 int r;
287
288 assert(s);
289
290 if (UNIT(s)->fragment_path)
291 s->from_fragment = true;
292
293 if (!s->what) {
294 if (s->parameters_fragment.what)
295 s->what = strdup(s->parameters_fragment.what);
296 else if (s->parameters_proc_swaps.what)
297 s->what = strdup(s->parameters_proc_swaps.what);
298 else {
299 r = unit_name_to_path(UNIT(s)->id, &s->what);
300 if (r < 0)
301 return r;
302 }
303
304 if (!s->what)
305 return -ENOMEM;
306 }
307
308 path_simplify(s->what);
309
310 if (!UNIT(s)->description) {
311 r = unit_set_description(UNIT(s), s->what);
312 if (r < 0)
313 return r;
314 }
315
316 r = unit_add_mounts_for(UNIT(s), s->what, UNIT_DEPENDENCY_IMPLICIT, UNIT_MOUNT_REQUIRES);
317 if (r < 0)
318 return r;
319
320 r = swap_add_device_dependencies(s);
321 if (r < 0)
322 return r;
323
324 r = swap_load_devnode(s);
325 if (r < 0)
326 return r;
327
328 r = unit_patch_contexts(UNIT(s));
329 if (r < 0)
330 return r;
331
332 r = unit_add_exec_dependencies(UNIT(s), &s->exec_context);
333 if (r < 0)
334 return r;
335
336 r = unit_set_default_slice(UNIT(s));
337 if (r < 0)
338 return r;
339
340 r = swap_add_default_dependencies(s);
341 if (r < 0)
342 return r;
343
344 return 0;
345}
346
347static int swap_load(Unit *u) {
348 Swap *s = ASSERT_PTR(SWAP(u));
349 int r;
350
351 assert(u->load_state == UNIT_STUB);
352
353 /* Load a .swap file */
354 r = unit_load_fragment_and_dropin(u, /* fragment_required = */ !s->from_proc_swaps);
355
356 /* Add in some extras, and do so either when we successfully loaded something or when /proc/swaps is
357 * already active. */
358 if (u->load_state == UNIT_LOADED || s->from_proc_swaps)
359 RET_GATHER(r, swap_add_extras(s));
360
361 if (r < 0)
362 return r;
363
364 if (u->load_state != UNIT_LOADED)
365 return 0;
366
367 return swap_verify(s);
368}
369
370static int swap_setup_unit(
371 Manager *m,
372 const char *what,
373 const char *what_proc_swaps,
374 int priority,
375 bool set_flags) {
376
377 _cleanup_(unit_freep) Unit *new_unit = NULL;
378 _cleanup_free_ char *e = NULL;
379 Unit *u;
380 Swap *s;
381 int r;
382
383 assert(m);
384 assert(what);
385 assert(what_proc_swaps);
386
387 r = unit_name_from_path(what, ".swap", &e);
388 if (r < 0)
389 return log_error_errno(r, "Failed to generate unit name from path: %m");
390
391 u = manager_get_unit(m, e);
392 if (u) {
393 s = ASSERT_PTR(SWAP(u));
394
395 if (s->from_proc_swaps &&
396 !path_equal(s->parameters_proc_swaps.what, what_proc_swaps))
397 return log_unit_error_errno(u, SYNTHETIC_ERRNO(EEXIST),
398 "Swap appeared twice with different device paths %s and %s, refusing.",
399 s->parameters_proc_swaps.what, what_proc_swaps);
400 } else {
401 r = unit_new_for_name(m, sizeof(Swap), e, &new_unit);
402 if (r < 0)
403 return log_warning_errno(r, "Failed to load swap unit '%s': %m", e);
404
405 u = new_unit;
406 s = ASSERT_PTR(SWAP(u));
407
408 s->what = strdup(what);
409 if (!s->what)
410 return log_oom();
411 }
412
413 SwapParameters *p = &s->parameters_proc_swaps;
414
415 if (!p->what) {
416 p->what = strdup(what_proc_swaps);
417 if (!p->what)
418 return log_oom();
419 }
420
421 /* The unit is definitely around now. When we previously fail to load the unit, let's reload the unit
422 * by resetting the load state and load error, and adding the unit to the load queue. */
423 if (UNIT_IS_LOAD_ERROR(u->load_state)) {
424 u->load_state = UNIT_STUB;
425 u->load_error = 0;
426 }
427
428 unit_add_to_load_queue(u);
429
430 if (set_flags) {
431 s->is_active = true;
432 s->just_activated = !s->from_proc_swaps;
433 }
434
435 s->from_proc_swaps = true;
436
437 p->priority = priority;
438 p->priority_set = true;
439
440 unit_add_to_dbus_queue(u);
441 TAKE_PTR(new_unit);
442
443 return 0;
444}
445
446static void swap_process_new(Manager *m, const char *device, int prio, bool set_flags) {
447 _cleanup_(sd_device_unrefp) sd_device *d = NULL;
448 const char *dn;
449 struct stat st, st_link;
450 int r;
451
452 assert(m);
453
454 if (swap_setup_unit(m, device, device, prio, set_flags) < 0)
455 return;
456
457 /* If this is a block device, then let's add duplicates for
458 * all other names of this block device */
459 if (stat(device, &st) < 0 || !S_ISBLK(st.st_mode))
460 return;
461
462 r = sd_device_new_from_stat_rdev(&d, &st);
463 if (r < 0)
464 return (void) log_full_errno(r == -ENOENT ? LOG_DEBUG : LOG_WARNING, r,
465 "Failed to allocate device for swap %s: %m", device);
466
467 /* Add the main device node */
468 if (sd_device_get_devname(d, &dn) >= 0 && !streq(dn, device))
469 (void) swap_setup_unit(m, dn, device, prio, set_flags);
470
471 /* Add additional units for all symlinks */
472 FOREACH_DEVICE_DEVLINK(d, devlink) {
473
474 /* Don't bother with the /dev/block links */
475 if (streq(devlink, device))
476 continue;
477
478 if (path_startswith(devlink, "/dev/block/"))
479 continue;
480
481 if (stat(devlink, &st_link) >= 0 &&
482 (!S_ISBLK(st_link.st_mode) ||
483 st_link.st_rdev != st.st_rdev))
484 continue;
485
486 (void) swap_setup_unit(m, devlink, device, prio, set_flags);
487 }
488}
489
490static void swap_set_state(Swap *s, SwapState state) {
491 SwapState old_state;
492
493 assert(s);
494
495 if (s->state != state)
496 bus_unit_send_pending_change_signal(UNIT(s), false);
497
498 old_state = s->state;
499 s->state = state;
500
501 if (!SWAP_STATE_WITH_PROCESS(state)) {
502 s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source);
503 swap_unwatch_control_pid(s);
504 s->control_command = NULL;
505 s->control_command_id = _SWAP_EXEC_COMMAND_INVALID;
506 }
507
508 if (state != old_state)
509 log_unit_debug(UNIT(s), "Changed %s -> %s", swap_state_to_string(old_state), swap_state_to_string(state));
510
511 unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], /* reload_success = */ true);
512
513 /* If there other units for the same device node have a job
514 queued it might be worth checking again if it is runnable
515 now. This is necessary, since swap_start() refuses
516 operation with EAGAIN if there's already another job for
517 the same device node queued. */
518 LIST_FOREACH_OTHERS(same_devnode, other, s)
519 if (UNIT(other)->job)
520 job_add_to_run_queue(UNIT(other)->job);
521}
522
523static int swap_coldplug(Unit *u) {
524 Swap *s = ASSERT_PTR(SWAP(u));
525 SwapState new_state = SWAP_DEAD;
526 int r;
527
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 (pidref_is_set(&s->control_pid) &&
539 pidref_is_unwaited(&s->control_pid) > 0 &&
540 SWAP_STATE_WITH_PROCESS(new_state)) {
541
542 r = unit_watch_pidref(UNIT(s), &s->control_pid, /* exclusive= */ false);
543 if (r < 0)
544 return r;
545
546 r = swap_arm_timer(s, /* relative= */ false, usec_add(u->state_change_timestamp.monotonic, s->timeout_usec));
547 if (r < 0)
548 return r;
549 }
550
551 if (!IN_SET(new_state, SWAP_DEAD, SWAP_FAILED))
552 (void) unit_setup_exec_runtime(u);
553
554 swap_set_state(s, new_state);
555 return 0;
556}
557
558static void swap_dump(Unit *u, FILE *f, const char *prefix) {
559 Swap *s = ASSERT_PTR(SWAP(u));
560 SwapParameters *p;
561 const char *prefix2;
562
563 assert(f);
564
565 prefix = strempty(prefix);
566 prefix2 = strjoina(prefix, "\t");
567
568 if (s->from_proc_swaps)
569 p = &s->parameters_proc_swaps;
570 else if (s->from_fragment)
571 p = &s->parameters_fragment;
572 else
573 p = NULL;
574
575 fprintf(f,
576 "%sSwap State: %s\n"
577 "%sResult: %s\n"
578 "%sClean Result: %s\n"
579 "%sWhat: %s\n"
580 "%sFrom /proc/swaps: %s\n"
581 "%sFrom fragment: %s\n"
582 "%sExtrinsic: %s\n",
583 prefix, swap_state_to_string(s->state),
584 prefix, swap_result_to_string(s->result),
585 prefix, swap_result_to_string(s->clean_result),
586 prefix, s->what,
587 prefix, yes_no(s->from_proc_swaps),
588 prefix, yes_no(s->from_fragment),
589 prefix, yes_no(swap_is_extrinsic(u)));
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 fprintf(f,
602 "%sTimeoutSec: %s\n",
603 prefix, FORMAT_TIMESPAN(s->timeout_usec, USEC_PER_SEC));
604
605 if (pidref_is_set(&s->control_pid))
606 fprintf(f,
607 "%sControl PID: "PID_FMT"\n",
608 prefix, s->control_pid.pid);
609
610 exec_context_dump(&s->exec_context, f, prefix);
611 kill_context_dump(&s->kill_context, f, prefix);
612 cgroup_context_dump(UNIT(s), f, prefix);
613
614 for (SwapExecCommand c = 0; c < _SWAP_EXEC_COMMAND_MAX; c++) {
615 if (!s->exec_command[c].argv)
616 continue;
617
618 fprintf(f, "%s%s %s:\n",
619 prefix, glyph(GLYPH_ARROW_RIGHT), swap_exec_command_to_string(c));
620
621 exec_command_dump(s->exec_command + c, f, prefix2);
622 }
623}
624
625static int swap_spawn(Swap *s, ExecCommand *c, PidRef *ret_pid) {
626 _cleanup_(exec_params_shallow_clear) ExecParameters exec_params = EXEC_PARAMETERS_INIT(
627 EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN);
628 _cleanup_(pidref_done) PidRef pidref = PIDREF_NULL;
629 int r;
630
631 assert(s);
632 assert(c);
633 assert(ret_pid);
634
635 r = unit_prepare_exec(UNIT(s));
636 if (r < 0)
637 return r;
638
639 r = swap_arm_timer(s, /* relative= */ true, s->timeout_usec);
640 if (r < 0)
641 return r;
642
643 r = unit_set_exec_params(UNIT(s), &exec_params);
644 if (r < 0)
645 return r;
646
647 /* Assume the label inherited from systemd as the fallback */
648 exec_params.fallback_smack_process_label = NULL;
649
650 r = exec_spawn(UNIT(s),
651 c,
652 &s->exec_context,
653 &exec_params,
654 s->exec_runtime,
655 &s->cgroup_context,
656 &pidref);
657 if (r < 0)
658 return r;
659
660 r = unit_watch_pidref(UNIT(s), &pidref, /* exclusive= */ true);
661 if (r < 0)
662 return r;
663
664 *ret_pid = TAKE_PIDREF(pidref);
665 return 0;
666}
667
668static void swap_enter_dead(Swap *s, SwapResult f) {
669 assert(s);
670
671 if (s->result == SWAP_SUCCESS)
672 s->result = f;
673
674 unit_log_result(UNIT(s), s->result == SWAP_SUCCESS, swap_result_to_string(s->result));
675 unit_warn_leftover_processes(UNIT(s), /* start = */ false);
676
677 swap_set_state(s, s->result != SWAP_SUCCESS ? SWAP_FAILED : SWAP_DEAD);
678
679 s->exec_runtime = exec_runtime_destroy(s->exec_runtime);
680
681 unit_destroy_runtime_data(UNIT(s), &s->exec_context, /* destroy_runtime_dir = */ true);
682
683 unit_unref_uid_gid(UNIT(s), true);
684}
685
686static void swap_enter_active(Swap *s, SwapResult f) {
687 assert(s);
688
689 if (s->result == SWAP_SUCCESS)
690 s->result = f;
691
692 swap_set_state(s, SWAP_ACTIVE);
693}
694
695static void swap_enter_dead_or_active(Swap *s, SwapResult f) {
696 assert(s);
697
698 if (s->from_proc_swaps) {
699 swap_enter_active(s, f);
700
701 LIST_FOREACH_OTHERS(same_devnode, other, s)
702 if (UNIT(other)->job)
703 swap_enter_dead_or_active(other, f);
704 } else
705 swap_enter_dead(s, f);
706}
707
708static int state_to_kill_operation(Swap *s, SwapState state) {
709 if (state == SWAP_DEACTIVATING_SIGTERM) {
710 if (unit_has_job_type(UNIT(s), JOB_RESTART))
711 return KILL_RESTART;
712 else
713 return KILL_TERMINATE;
714 }
715
716 return KILL_KILL;
717}
718
719static void swap_enter_signal(Swap *s, SwapState state, SwapResult f) {
720 int r;
721
722 assert(s);
723
724 if (s->result == SWAP_SUCCESS)
725 s->result = f;
726
727 r = unit_kill_context(UNIT(s), state_to_kill_operation(s, state));
728 if (r < 0) {
729 log_unit_warning_errno(UNIT(s), r, "Failed to kill processes: %m");
730 goto fail;
731 }
732
733 if (r > 0) {
734 r = swap_arm_timer(s, /* relative= */ true, s->timeout_usec);
735 if (r < 0) {
736 log_unit_warning_errno(UNIT(s), r, "Failed to install timer: %m");
737 goto fail;
738 }
739
740 swap_set_state(s, state);
741 } else if (state == SWAP_DEACTIVATING_SIGTERM && s->kill_context.send_sigkill)
742 swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, SWAP_SUCCESS);
743 else
744 swap_enter_dead_or_active(s, SWAP_SUCCESS);
745
746 return;
747
748fail:
749 swap_enter_dead_or_active(s, SWAP_FAILURE_RESOURCES);
750}
751
752static void swap_enter_activating(Swap *s) {
753 _cleanup_free_ char *opts = NULL;
754 int r;
755
756 assert(s);
757
758 unit_warn_leftover_processes(UNIT(s), /* start = */ true);
759
760 s->control_command_id = SWAP_EXEC_ACTIVATE;
761 s->control_command = s->exec_command + SWAP_EXEC_ACTIVATE;
762
763 if (s->from_fragment) {
764 int priority = 0;
765
766 r = fstab_find_pri(s->parameters_fragment.options, &priority);
767 if (r < 0)
768 log_unit_warning_errno(UNIT(s), r, "Failed to parse swap priority \"%s\", ignoring: %m", s->parameters_fragment.options);
769 else if (r > 0 && s->parameters_fragment.priority_set)
770 log_unit_warning(UNIT(s), "Duplicate swap priority configuration by Priority= and Options= fields.");
771
772 if (r <= 0 && s->parameters_fragment.priority_set) {
773 if (s->parameters_fragment.options)
774 r = asprintf(&opts, "%s,pri=%i", s->parameters_fragment.options, s->parameters_fragment.priority);
775 else
776 r = asprintf(&opts, "pri=%i", s->parameters_fragment.priority);
777 if (r < 0) {
778 r = log_oom();
779 goto fail;
780 }
781 }
782 }
783
784 r = exec_command_set(s->control_command, "/sbin/swapon", "--fixpgsz", NULL);
785 if (r < 0) {
786 log_unit_warning_errno(UNIT(s), r, "Failed to initialize swapon command line: %m");
787 goto fail;
788 }
789
790 if (s->parameters_fragment.options || opts) {
791 r = exec_command_append(s->control_command, "-o",
792 opts ?: s->parameters_fragment.options, NULL);
793 if (r < 0) {
794 log_unit_warning_errno(UNIT(s), r, "Failed to prepare swapon command line: %m");
795 goto fail;
796 }
797 }
798
799 r = exec_command_append(s->control_command, s->what, NULL);
800 if (r < 0) {
801 log_unit_warning_errno(UNIT(s), r, "Failed to prepare swapon command line: %m");
802 goto fail;
803 }
804
805 swap_unwatch_control_pid(s);
806
807 r = swap_spawn(s, s->control_command, &s->control_pid);
808 if (r < 0) {
809 log_unit_warning_errno(UNIT(s), r, "Failed to spawn 'swapon' task: %m");
810 goto fail;
811 }
812
813 swap_set_state(s, SWAP_ACTIVATING);
814 return;
815
816fail:
817 swap_enter_dead_or_active(s, SWAP_FAILURE_RESOURCES);
818}
819
820static void swap_enter_deactivating(Swap *s) {
821 int r;
822
823 assert(s);
824
825 s->control_command_id = SWAP_EXEC_DEACTIVATE;
826 s->control_command = s->exec_command + SWAP_EXEC_DEACTIVATE;
827
828 r = exec_command_set(s->control_command,
829 "/sbin/swapoff",
830 s->what,
831 NULL);
832 if (r < 0) {
833 log_unit_warning_errno(UNIT(s), r, "Failed to prepare swapoff command line: %m");
834 goto fail;
835 }
836
837 swap_unwatch_control_pid(s);
838
839 r = swap_spawn(s, s->control_command, &s->control_pid);
840 if (r < 0) {
841 log_unit_warning_errno(UNIT(s), r, "Failed to spawn 'swapoff' task: %m");
842 goto fail;
843 }
844
845 swap_set_state(s, SWAP_DEACTIVATING);
846 return;
847
848fail:
849 swap_enter_dead_or_active(s, SWAP_FAILURE_RESOURCES);
850}
851
852static void swap_cycle_clear(Swap *s) {
853 assert(s);
854
855 s->result = SWAP_SUCCESS;
856 exec_command_reset_status_array(s->exec_command, _SWAP_EXEC_COMMAND_MAX);
857
858 if (s->cgroup_runtime)
859 s->cgroup_runtime->reset_accounting = true;
860}
861
862static int swap_start(Unit *u) {
863 Swap *s = SWAP(u);
864 int r;
865
866 assert(s);
867
868 /* We cannot fulfill this request right now, try again later please! */
869 if (IN_SET(s->state,
870 SWAP_DEACTIVATING,
871 SWAP_DEACTIVATING_SIGTERM,
872 SWAP_DEACTIVATING_SIGKILL,
873 SWAP_CLEANING))
874 return -EAGAIN;
875
876 /* Already on it! */
877 if (s->state == SWAP_ACTIVATING)
878 return 0;
879
880 assert(IN_SET(s->state, SWAP_DEAD, SWAP_FAILED));
881
882 if (detect_container() > 0)
883 return -EPERM;
884
885 /* If there's a job for another swap unit for the same node
886 * running, then let's not dispatch this one for now, and wait
887 * until that other job has finished. */
888 LIST_FOREACH_OTHERS(same_devnode, other, s)
889 if (UNIT(other)->job && UNIT(other)->job->state == JOB_RUNNING)
890 return -EAGAIN;
891
892 r = unit_acquire_invocation_id(u);
893 if (r < 0)
894 return r;
895
896 swap_cycle_clear(s);
897 swap_enter_activating(s);
898 return 1;
899}
900
901static int swap_stop(Unit *u) {
902 Swap *s = ASSERT_PTR(SWAP(u));
903
904 switch (s->state) {
905
906 case SWAP_DEACTIVATING:
907 case SWAP_DEACTIVATING_SIGTERM:
908 case SWAP_DEACTIVATING_SIGKILL:
909 /* Already on it */
910 return 0;
911
912 case SWAP_ACTIVATING:
913 case SWAP_ACTIVATING_DONE:
914 /* There's a control process pending, directly enter kill mode */
915 swap_enter_signal(s, SWAP_DEACTIVATING_SIGTERM, SWAP_SUCCESS);
916 return 0;
917
918 case SWAP_ACTIVE:
919 if (detect_container() > 0)
920 return -EPERM;
921
922 swap_enter_deactivating(s);
923 return 1;
924
925 case SWAP_CLEANING:
926 /* If we are currently cleaning, then abort it, brutally. */
927 swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, SWAP_SUCCESS);
928 return 0;
929
930 default:
931 assert_not_reached();
932 }
933}
934
935static int swap_serialize(Unit *u, FILE *f, FDSet *fds) {
936 Swap *s = ASSERT_PTR(SWAP(u));
937
938 assert(f);
939 assert(fds);
940
941 (void) serialize_item(f, "state", swap_state_to_string(s->state));
942 (void) serialize_item(f, "result", swap_result_to_string(s->result));
943 (void) serialize_pidref(f, fds, "control-pid", &s->control_pid);
944
945 if (s->control_command_id >= 0)
946 (void) serialize_item(f, "control-command", swap_exec_command_to_string(s->control_command_id));
947
948 return 0;
949}
950
951static int swap_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
952 Swap *s = ASSERT_PTR(SWAP(u));
953
954 assert(fds);
955
956 if (streq(key, "state")) {
957 SwapState state;
958
959 state = swap_state_from_string(value);
960 if (state < 0)
961 log_unit_debug(u, "Failed to parse state value: %s", value);
962 else
963 s->deserialized_state = state;
964 } else if (streq(key, "result")) {
965 SwapResult f;
966
967 f = swap_result_from_string(value);
968 if (f < 0)
969 log_unit_debug(u, "Failed to parse result value: %s", value);
970 else if (f != SWAP_SUCCESS)
971 s->result = f;
972 } else if (streq(key, "control-pid")) {
973
974 if (!pidref_is_set(&s->control_pid))
975 (void) deserialize_pidref(fds, value, &s->control_pid);
976
977 } else if (streq(key, "control-command")) {
978 SwapExecCommand id;
979
980 id = swap_exec_command_from_string(value);
981 if (id < 0)
982 log_unit_debug(u, "Failed to parse exec-command value: %s", value);
983 else {
984 s->control_command_id = id;
985 s->control_command = s->exec_command + id;
986 }
987 } else
988 log_unit_debug(u, "Unknown serialization key: %s", key);
989
990 return 0;
991}
992
993static void swap_sigchld_event(Unit *u, pid_t pid, int code, int status) {
994 Swap *s = ASSERT_PTR(SWAP(u));
995 SwapResult f;
996
997 assert(pid >= 0);
998
999 if (pid != s->control_pid.pid)
1000 return;
1001
1002 /* Let's scan /proc/swaps before we process SIGCHLD. For the reasoning see the similar code in
1003 * mount.c */
1004 (void) swap_process_proc_swaps(u->manager);
1005
1006 pidref_done(&s->control_pid);
1007
1008 if (is_clean_exit(code, status, EXIT_CLEAN_COMMAND, NULL))
1009 f = SWAP_SUCCESS;
1010 else if (code == CLD_EXITED)
1011 f = SWAP_FAILURE_EXIT_CODE;
1012 else if (code == CLD_KILLED)
1013 f = SWAP_FAILURE_SIGNAL;
1014 else if (code == CLD_DUMPED)
1015 f = SWAP_FAILURE_CORE_DUMP;
1016 else
1017 assert_not_reached();
1018
1019 if (s->result == SWAP_SUCCESS)
1020 s->result = f;
1021
1022 if (s->control_command) {
1023 exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status);
1024
1025 s->control_command = NULL;
1026 s->control_command_id = _SWAP_EXEC_COMMAND_INVALID;
1027 }
1028
1029 unit_log_process_exit(
1030 u,
1031 "Swap process",
1032 swap_exec_command_to_string(s->control_command_id),
1033 f == SWAP_SUCCESS,
1034 code, status);
1035
1036 switch (s->state) {
1037
1038 case SWAP_ACTIVATING:
1039 case SWAP_ACTIVATING_DONE:
1040
1041 if (f == SWAP_SUCCESS || s->from_proc_swaps)
1042 swap_enter_active(s, f);
1043 else
1044 swap_enter_dead(s, f);
1045 break;
1046
1047 case SWAP_DEACTIVATING:
1048 case SWAP_DEACTIVATING_SIGKILL:
1049 case SWAP_DEACTIVATING_SIGTERM:
1050
1051 swap_enter_dead_or_active(s, f);
1052 break;
1053
1054 case SWAP_CLEANING:
1055 if (s->clean_result == SWAP_SUCCESS)
1056 s->clean_result = f;
1057
1058 swap_enter_dead(s, SWAP_SUCCESS);
1059 break;
1060
1061 default:
1062 assert_not_reached();
1063 }
1064
1065 /* Notify clients about changed exit status */
1066 unit_add_to_dbus_queue(u);
1067}
1068
1069static int swap_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
1070 Swap *s = ASSERT_PTR(SWAP(userdata));
1071
1072 assert(s->timer_event_source == source);
1073
1074 switch (s->state) {
1075
1076 case SWAP_ACTIVATING:
1077 case SWAP_ACTIVATING_DONE:
1078 log_unit_warning(UNIT(s), "Activation timed out. Stopping.");
1079 swap_enter_signal(s, SWAP_DEACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT);
1080 break;
1081
1082 case SWAP_DEACTIVATING:
1083 log_unit_warning(UNIT(s), "Deactivation timed out. Stopping.");
1084 swap_enter_signal(s, SWAP_DEACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT);
1085 break;
1086
1087 case SWAP_DEACTIVATING_SIGTERM:
1088 if (s->kill_context.send_sigkill) {
1089 log_unit_warning(UNIT(s), "Swap process timed out. Killing.");
1090 swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, SWAP_FAILURE_TIMEOUT);
1091 } else {
1092 log_unit_warning(UNIT(s), "Swap process timed out. Skipping SIGKILL. Ignoring.");
1093 swap_enter_dead_or_active(s, SWAP_FAILURE_TIMEOUT);
1094 }
1095 break;
1096
1097 case SWAP_DEACTIVATING_SIGKILL:
1098 log_unit_warning(UNIT(s), "Swap process still around after SIGKILL. Ignoring.");
1099 swap_enter_dead_or_active(s, SWAP_FAILURE_TIMEOUT);
1100 break;
1101
1102 case SWAP_CLEANING:
1103 log_unit_warning(UNIT(s), "Cleaning timed out. killing.");
1104
1105 if (s->clean_result == SWAP_SUCCESS)
1106 s->clean_result = SWAP_FAILURE_TIMEOUT;
1107
1108 swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, 0);
1109 break;
1110
1111 default:
1112 assert_not_reached();
1113 }
1114
1115 return 0;
1116}
1117
1118static int swap_load_proc_swaps(Manager *m, bool set_flags) {
1119 assert(m);
1120
1121 rewind(m->proc_swaps);
1122
1123 (void) fscanf(m->proc_swaps, "%*s %*s %*s %*s %*s\n");
1124
1125 for (unsigned i = 1;; i++) {
1126 _cleanup_free_ char *dev = NULL, *d = NULL;
1127 int prio = 0, k;
1128
1129 k = fscanf(m->proc_swaps,
1130 "%ms " /* device/file */
1131 "%*s " /* type of swap */
1132 "%*s " /* swap size */
1133 "%*s " /* used */
1134 "%i\n", /* priority */
1135 &dev, &prio);
1136 if (k != 2) {
1137 if (k == EOF)
1138 break;
1139
1140 log_warning("Failed to parse /proc/swaps:%u, skipping.", i);
1141 continue;
1142 }
1143
1144 ssize_t l = cunescape(dev, UNESCAPE_RELAX, &d);
1145 if (l < 0)
1146 return log_error_errno(l, "Failed to unescape device path: %m");
1147
1148 device_found_node(m, d, DEVICE_FOUND_SWAP, DEVICE_FOUND_SWAP);
1149
1150 (void) swap_process_new(m, d, prio, set_flags);
1151 }
1152
1153 return 0;
1154}
1155
1156static int swap_process_proc_swaps(Manager *m) {
1157 int r;
1158
1159 assert(m);
1160
1161 r = swap_load_proc_swaps(m, true);
1162 if (r < 0) {
1163 /* Reset flags, just in case, for late calls */
1164 LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) {
1165 Swap *swap = SWAP(u);
1166
1167 assert(swap);
1168
1169 swap->is_active = swap->just_activated = false;
1170 }
1171
1172 return 0;
1173 }
1174
1175 manager_dispatch_load_queue(m);
1176
1177 LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) {
1178 Swap *swap = SWAP(u);
1179
1180 assert(swap);
1181
1182 if (!swap->is_active) {
1183
1184 swap_unset_proc_swaps(swap);
1185
1186 switch (swap->state) {
1187
1188 case SWAP_ACTIVE:
1189 /* This has just been deactivated */
1190 swap_enter_dead(swap, SWAP_SUCCESS);
1191 break;
1192
1193 default:
1194 /* Fire again */
1195 swap_set_state(swap, swap->state);
1196 }
1197
1198 if (swap->what)
1199 device_found_node(m, swap->what, DEVICE_NOT_FOUND, DEVICE_FOUND_SWAP);
1200
1201 } else if (swap->just_activated) {
1202
1203 /* New swap entry */
1204
1205 switch (swap->state) {
1206
1207 case SWAP_DEAD:
1208 case SWAP_FAILED:
1209 (void) unit_acquire_invocation_id(u);
1210 swap_cycle_clear(swap);
1211 swap_enter_active(swap, SWAP_SUCCESS);
1212 break;
1213
1214 case SWAP_ACTIVATING:
1215 swap_set_state(swap, SWAP_ACTIVATING_DONE);
1216 break;
1217
1218 default:
1219 /* Nothing really changed, but let's issue an notification call nonetheless,
1220 * in case somebody is waiting for this. */
1221 swap_set_state(swap, swap->state);
1222 }
1223 }
1224
1225 /* Reset the flags for later calls */
1226 swap->is_active = swap->just_activated = false;
1227 }
1228
1229 return 1;
1230}
1231
1232static int swap_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
1233 Manager *m = ASSERT_PTR(userdata);
1234
1235 assert(revents & EPOLLPRI);
1236
1237 return swap_process_proc_swaps(m);
1238}
1239
1240static Unit* swap_following(Unit *u) {
1241 Swap *s = ASSERT_PTR(SWAP(u));
1242 Swap *first = NULL;
1243
1244 /* If the user configured the swap through /etc/fstab or
1245 * a device unit, follow that. */
1246
1247 if (s->from_fragment)
1248 return NULL;
1249
1250 LIST_FOREACH_OTHERS(same_devnode, other, s)
1251 if (other->from_fragment)
1252 return UNIT(other);
1253
1254 /* Otherwise, make everybody follow the unit that's named after
1255 * the swap device in the kernel */
1256
1257 if (streq_ptr(s->what, s->devnode))
1258 return NULL;
1259
1260 LIST_FOREACH(same_devnode, other, s->same_devnode_next)
1261 if (streq_ptr(other->what, other->devnode))
1262 return UNIT(other);
1263
1264 LIST_FOREACH_BACKWARDS(same_devnode, other, s->same_devnode_prev) {
1265 if (streq_ptr(other->what, other->devnode))
1266 return UNIT(other);
1267
1268 first = other;
1269 }
1270
1271 /* Fall back to the first on the list */
1272 return UNIT(first);
1273}
1274
1275static int swap_following_set(Unit *u, Set **ret) {
1276 Swap *s = ASSERT_PTR(SWAP(u));
1277 _cleanup_set_free_ Set *set = NULL;
1278 int r;
1279
1280 assert(ret);
1281
1282 if (LIST_JUST_US(same_devnode, s)) {
1283 *ret = NULL;
1284 return 0;
1285 }
1286
1287 set = set_new(NULL);
1288 if (!set)
1289 return -ENOMEM;
1290
1291 LIST_FOREACH_OTHERS(same_devnode, other, s) {
1292 r = set_put(set, other);
1293 if (r < 0)
1294 return r;
1295 }
1296
1297 *ret = TAKE_PTR(set);
1298 return 1;
1299}
1300
1301static void swap_shutdown(Manager *m) {
1302 assert(m);
1303
1304 m->swap_event_source = sd_event_source_disable_unref(m->swap_event_source);
1305 m->proc_swaps = safe_fclose(m->proc_swaps);
1306 m->swaps_by_devnode = hashmap_free(m->swaps_by_devnode);
1307}
1308
1309static void swap_enumerate(Manager *m) {
1310 int r;
1311
1312 assert(m);
1313
1314 if (!m->proc_swaps) {
1315 m->proc_swaps = fopen("/proc/swaps", "re");
1316 if (!m->proc_swaps) {
1317 if (errno == ENOENT)
1318 log_debug_errno(errno, "Not swap enabled, skipping enumeration.");
1319 else
1320 log_warning_errno(errno, "Failed to open %s, ignoring: %m", "/proc/swaps");
1321
1322 return;
1323 }
1324
1325 r = sd_event_add_io(m->event, &m->swap_event_source, fileno(m->proc_swaps), EPOLLPRI, swap_dispatch_io, m);
1326 if (r < 0) {
1327 log_error_errno(r, "Failed to watch /proc/swaps: %m");
1328 goto fail;
1329 }
1330
1331 /* Dispatch this before we dispatch SIGCHLD, so that
1332 * we always get the events from /proc/swaps before
1333 * the SIGCHLD of /sbin/swapon. */
1334 r = sd_event_source_set_priority(m->swap_event_source, EVENT_PRIORITY_SWAP_TABLE);
1335 if (r < 0) {
1336 log_error_errno(r, "Failed to change /proc/swaps priority: %m");
1337 goto fail;
1338 }
1339
1340 (void) sd_event_source_set_description(m->swap_event_source, "swap-proc");
1341 }
1342
1343 r = swap_load_proc_swaps(m, false);
1344 if (r < 0)
1345 goto fail;
1346
1347 return;
1348
1349fail:
1350 swap_shutdown(m);
1351}
1352
1353int swap_process_device_new(Manager *m, sd_device *dev) {
1354 _cleanup_free_ char *e = NULL;
1355 const char *dn;
1356 Unit *u;
1357 int r;
1358
1359 assert(m);
1360 assert(dev);
1361
1362 if (sd_device_get_devname(dev, &dn) < 0)
1363 return 0;
1364
1365 r = unit_name_from_path(dn, ".swap", &e);
1366 if (r < 0) {
1367 log_debug_errno(r, "Cannot convert device name '%s' to unit name, ignoring: %m", dn);
1368 return 0;
1369 }
1370
1371 u = manager_get_unit(m, e);
1372 if (u)
1373 r = swap_set_devnode(SWAP(u), dn);
1374
1375 FOREACH_DEVICE_DEVLINK(dev, devlink) {
1376 _cleanup_free_ char *n = NULL;
1377 int q;
1378
1379 q = unit_name_from_path(devlink, ".swap", &n);
1380 if (q == -EINVAL) /* If the name is not convertible to unit name, we can't manage it */
1381 continue;
1382 if (q < 0)
1383 return q;
1384
1385 u = manager_get_unit(m, n);
1386 if (u) {
1387 q = swap_set_devnode(SWAP(u), dn);
1388 if (q < 0)
1389 r = q;
1390 }
1391 }
1392
1393 return r;
1394}
1395
1396int swap_process_device_remove(Manager *m, sd_device *dev) {
1397 const char *dn;
1398 Swap *s;
1399 int r;
1400
1401 r = sd_device_get_devname(dev, &dn);
1402 if (r < 0)
1403 return 0;
1404
1405 r = 0;
1406 while ((s = hashmap_get(m->swaps_by_devnode, dn)))
1407 RET_GATHER(r, swap_set_devnode(s, NULL));
1408
1409 return r;
1410}
1411
1412static void swap_reset_failed(Unit *u) {
1413 Swap *s = ASSERT_PTR(SWAP(u));
1414
1415 if (s->state == SWAP_FAILED)
1416 swap_set_state(s, SWAP_DEAD);
1417
1418 s->result = SWAP_SUCCESS;
1419 s->clean_result = SWAP_SUCCESS;
1420}
1421
1422static void swap_handoff_timestamp(
1423 Unit *u,
1424 const struct ucred *ucred,
1425 const dual_timestamp *ts) {
1426
1427 Swap *s = ASSERT_PTR(SWAP(u));
1428
1429 assert(ucred);
1430 assert(ts);
1431
1432 if (s->control_pid.pid == ucred->pid && s->control_command) {
1433 exec_status_handoff(&s->control_command->exec_status, ucred, ts);
1434 unit_add_to_dbus_queue(u);
1435 }
1436}
1437
1438static int swap_get_timeout(Unit *u, usec_t *timeout) {
1439 Swap *s = ASSERT_PTR(SWAP(u));
1440 usec_t t;
1441 int r;
1442
1443 if (!s->timer_event_source)
1444 return 0;
1445
1446 r = sd_event_source_get_time(s->timer_event_source, &t);
1447 if (r < 0)
1448 return r;
1449 if (t == USEC_INFINITY)
1450 return 0;
1451
1452 *timeout = t;
1453 return 1;
1454}
1455
1456static bool swap_supported(void) {
1457 static int supported = -1;
1458
1459 /* If swap support is not available in the kernel, or we are
1460 * running in a container we don't support swap units, and any
1461 * attempts to starting one should fail immediately. */
1462
1463 if (supported < 0)
1464 supported =
1465 access("/proc/swaps", F_OK) >= 0 &&
1466 detect_container() <= 0;
1467
1468 return supported;
1469}
1470
1471static PidRef* swap_control_pid(Unit *u) {
1472 return &ASSERT_PTR(SWAP(u))->control_pid;
1473}
1474
1475static int swap_clean(Unit *u, ExecCleanMask mask) {
1476 Swap *s = ASSERT_PTR(SWAP(u));
1477 _cleanup_strv_free_ char **l = NULL;
1478 int r;
1479
1480 assert(mask != 0);
1481
1482 if (s->state != SWAP_DEAD)
1483 return -EBUSY;
1484
1485 r = exec_context_get_clean_directories(&s->exec_context, u->manager->prefix, mask, &l);
1486 if (r < 0)
1487 return r;
1488
1489 if (strv_isempty(l))
1490 return -EUNATCH;
1491
1492 swap_unwatch_control_pid(s);
1493 s->clean_result = SWAP_SUCCESS;
1494 s->control_command = NULL;
1495 s->control_command_id = _SWAP_EXEC_COMMAND_INVALID;
1496
1497 r = swap_arm_timer(s, /* relative= */ true, s->exec_context.timeout_clean_usec);
1498 if (r < 0) {
1499 log_unit_warning_errno(u, r, "Failed to install timer: %m");
1500 goto fail;
1501 }
1502
1503 r = unit_fork_and_watch_rm_rf(u, l, &s->control_pid);
1504 if (r < 0) {
1505 log_unit_warning_errno(u, r, "Failed to spawn cleaning task: %m");
1506 goto fail;
1507 }
1508
1509 swap_set_state(s, SWAP_CLEANING);
1510 return 0;
1511
1512fail:
1513 s->clean_result = SWAP_FAILURE_RESOURCES;
1514 s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source);
1515 return r;
1516}
1517
1518static int swap_can_clean(Unit *u, ExecCleanMask *ret) {
1519 Swap *s = ASSERT_PTR(SWAP(u));
1520
1521 return exec_context_get_clean_mask(&s->exec_context, ret);
1522}
1523
1524static int swap_can_start(Unit *u) {
1525 Swap *s = ASSERT_PTR(SWAP(u));
1526 int r;
1527
1528 r = unit_test_start_limit(u);
1529 if (r < 0) {
1530 swap_enter_dead(s, SWAP_FAILURE_START_LIMIT_HIT);
1531 return r;
1532 }
1533
1534 return 1;
1535}
1536
1537int swap_get_priority(const Swap *s) {
1538 assert(s);
1539
1540 if (s->from_proc_swaps && s->parameters_proc_swaps.priority_set)
1541 return s->parameters_proc_swaps.priority;
1542
1543 if (s->from_fragment && s->parameters_fragment.priority_set)
1544 return s->parameters_fragment.priority;
1545
1546 return -1;
1547}
1548
1549const char* swap_get_options(const Swap *s) {
1550 assert(s);
1551
1552 if (s->from_fragment)
1553 return s->parameters_fragment.options;
1554
1555 return NULL;
1556}
1557
1558static const char* const swap_exec_command_table[_SWAP_EXEC_COMMAND_MAX] = {
1559 [SWAP_EXEC_ACTIVATE] = "ExecActivate",
1560 [SWAP_EXEC_DEACTIVATE] = "ExecDeactivate",
1561};
1562
1563DEFINE_STRING_TABLE_LOOKUP(swap_exec_command, SwapExecCommand);
1564
1565static const char* const swap_result_table[_SWAP_RESULT_MAX] = {
1566 [SWAP_SUCCESS] = "success",
1567 [SWAP_FAILURE_RESOURCES] = "resources",
1568 [SWAP_FAILURE_TIMEOUT] = "timeout",
1569 [SWAP_FAILURE_EXIT_CODE] = "exit-code",
1570 [SWAP_FAILURE_SIGNAL] = "signal",
1571 [SWAP_FAILURE_CORE_DUMP] = "core-dump",
1572 [SWAP_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
1573};
1574
1575DEFINE_STRING_TABLE_LOOKUP(swap_result, SwapResult);
1576
1577const UnitVTable swap_vtable = {
1578 .object_size = sizeof(Swap),
1579 .exec_context_offset = offsetof(Swap, exec_context),
1580 .cgroup_context_offset = offsetof(Swap, cgroup_context),
1581 .kill_context_offset = offsetof(Swap, kill_context),
1582 .exec_runtime_offset = offsetof(Swap, exec_runtime),
1583 .cgroup_runtime_offset = offsetof(Swap, cgroup_runtime),
1584
1585 .sections =
1586 "Unit\0"
1587 "Swap\0"
1588 "Install\0",
1589 .private_section = "Swap",
1590
1591 .can_fail = true,
1592
1593 .init = swap_init,
1594 .load = swap_load,
1595 .done = swap_done,
1596
1597 .coldplug = swap_coldplug,
1598
1599 .dump = swap_dump,
1600
1601 .start = swap_start,
1602 .stop = swap_stop,
1603
1604 .clean = swap_clean,
1605 .can_clean = swap_can_clean,
1606
1607 .get_timeout = swap_get_timeout,
1608
1609 .serialize = swap_serialize,
1610 .deserialize_item = swap_deserialize_item,
1611
1612 .active_state = swap_active_state,
1613 .sub_state_to_string = swap_sub_state_to_string,
1614
1615 .will_restart = unit_will_restart_default,
1616
1617 .may_gc = swap_may_gc,
1618 .is_extrinsic = swap_is_extrinsic,
1619
1620 .sigchld_event = swap_sigchld_event,
1621
1622 .reset_failed = swap_reset_failed,
1623
1624 .notify_handoff_timestamp = swap_handoff_timestamp,
1625
1626 .control_pid = swap_control_pid,
1627
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
1655 .can_start = swap_can_start,
1656
1657 .notify_plymouth = true,
1658};
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