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