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[thirdparty/systemd.git] / src / core / swap.c
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db9ecf05 1/* SPDX-License-Identifier: LGPL-2.1-or-later */
07b0b134 2
836e4e7e 3#include <sys/socket.h>
07b0b134 4#include <sys/stat.h>
4f5dd394 5#include <unistd.h>
07b0b134 6
4366e598 7#include "sd-device.h"
b4bbcaa9 8
b5efdb8a 9#include "alloc-util.h"
07b0b134 10#include "dbus-swap.h"
6fcbec6f 11#include "dbus-unit.h"
57b7a260 12#include "device.h"
1cf40697 13#include "device-util.h"
836e4e7e 14#include "errno-util.h"
4f5dd394 15#include "escape.h"
9a57c629 16#include "exit-status.h"
3ffd4af2 17#include "fd-util.h"
f97b34a6 18#include "format-util.h"
4f5dd394 19#include "fstab-util.h"
836e4e7e 20#include "glyph-util.h"
4ea4abb6 21#include "manager.h"
9eb977db 22#include "path-util.h"
7b3e062c 23#include "process-util.h"
d68c645b 24#include "serialize.h"
836e4e7e 25#include "set.h"
4f5dd394 26#include "special.h"
8b43440b 27#include "string-table.h"
07630cea 28#include "string-util.h"
836e4e7e 29#include "strv.h"
3ffd4af2 30#include "swap.h"
4f5dd394 31#include "unit.h"
1cf40697 32#include "unit-name.h"
4f5dd394 33#include "virt.h"
07b0b134
ML
34
35static const UnitActiveState state_translation_table[_SWAP_STATE_MAX] = {
17f6b640
YW
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,
e04aad61
LP
41 [SWAP_DEACTIVATING_SIGTERM] = UNIT_DEACTIVATING,
42 [SWAP_DEACTIVATING_SIGKILL] = UNIT_DEACTIVATING,
17f6b640
YW
43 [SWAP_FAILED] = UNIT_FAILED,
44 [SWAP_CLEANING] = UNIT_MAINTENANCE,
07b0b134
ML
45};
46
718db961
LP
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);
bcce581d 49static int swap_process_proc_swaps(Manager *m);
718db961 50
dedf3719
LP
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,
a8b689b7
YW
57 SWAP_DEACTIVATING_SIGKILL,
58 SWAP_CLEANING);
dedf3719
LP
59}
60
d1e8e8b5 61static UnitActiveState swap_active_state(Unit *u) {
39c79477
ZJS
62 assert(u);
63
64 return state_translation_table[SWAP(u)->state];
65}
66
d1e8e8b5 67static const char *swap_sub_state_to_string(Unit *u) {
39c79477
ZJS
68 assert(u);
69
70 return swap_state_to_string(SWAP(u)->state);
71}
72
d1e8e8b5 73static bool swap_may_gc(Unit *u) {
e9fa1bf7 74 Swap *s = ASSERT_PTR(SWAP(u));
39c79477
ZJS
75
76 if (s->from_proc_swaps)
77 return false;
78
79 return true;
80}
81
d1e8e8b5 82static bool swap_is_extrinsic(Unit *u) {
39c79477
ZJS
83 assert(SWAP(u));
84
85 return MANAGER_IS_USER(u->manager);
86}
87
e04aad61 88static void swap_unset_proc_swaps(Swap *s) {
9670d583
LP
89 assert(s);
90
91 if (!s->from_proc_swaps)
92 return;
93
a1e58e8e 94 s->parameters_proc_swaps.what = mfree(s->parameters_proc_swaps.what);
9670d583
LP
95 s->from_proc_swaps = false;
96}
97
98static int swap_set_devnode(Swap *s, const char *devnode) {
df326b84 99 Hashmap *swaps;
5bcb0f2b 100 Swap *first;
9670d583 101 int r;
e04aad61
LP
102
103 assert(s);
104
548f6937 105 r = hashmap_ensure_allocated(&UNIT(s)->manager->swaps_by_devnode, &path_hash_ops);
9670d583
LP
106 if (r < 0)
107 return r;
e04aad61 108
9670d583 109 swaps = UNIT(s)->manager->swaps_by_devnode;
e04aad61 110
9670d583
LP
111 if (s->devnode) {
112 first = hashmap_get(swaps, s->devnode);
e04aad61 113
9670d583
LP
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);
5bcb0f2b 119
a1e58e8e 120 s->devnode = mfree(s->devnode);
9670d583
LP
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;
e04aad61
LP
135}
136
f6cebb3b 137static void swap_init(Unit *u) {
e9fa1bf7 138 Swap *s = ASSERT_PTR(SWAP(u));
6e620bec 139
e9fa1bf7 140 assert(u->load_state == UNIT_STUB);
6e620bec 141
c9e120e0 142 s->timeout_usec = u->manager->defaults.timeout_start_usec;
e04aad61 143
c9e120e0
LP
144 s->exec_context.std_output = u->manager->defaults.std_output;
145 s->exec_context.std_error = u->manager->defaults.std_error;
085afe36 146
436cdf0a 147 s->control_pid = PIDREF_NULL;
e1770af8 148 s->control_command_id = _SWAP_EXEC_COMMAND_INVALID;
c8f4d764 149
5bcb0f2b 150 u->ignore_on_isolate = true;
e04aad61
LP
151}
152
153static void swap_unwatch_control_pid(Swap *s) {
154 assert(s);
ea1e0bf1 155 unit_unwatch_pidref_done(UNIT(s), &s->control_pid);
6e620bec
LP
156}
157
4e85aff4 158static void swap_done(Unit *u) {
e9fa1bf7 159 Swap *s = ASSERT_PTR(SWAP(u));
07b0b134 160
e04aad61 161 swap_unset_proc_swaps(s);
9670d583 162 swap_set_devnode(s, NULL);
e04aad61 163
a1e58e8e
LP
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);
86b23b07 167
28135da3 168 s->exec_runtime = exec_runtime_free(s->exec_runtime);
9cc54544 169
e04aad61
LP
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
5dcadb4c 175 s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source);
718db961
LP
176}
177
e9276800 178static int swap_arm_timer(Swap *s, bool relative, usec_t usec) {
718db961
LP
179 assert(s);
180
e9276800 181 return unit_arm_timer(UNIT(s), &s->timer_event_source, relative, usec, swap_dispatch_timer);
07b0b134
ML
182}
183
61f9cf4e
LP
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
eef85c4a 196static int swap_add_device_dependencies(Swap *s) {
61f9cf4e
LP
197 UnitDependencyMask mask;
198 SwapParameters *p;
44b0d1fd 199 int r;
61f9cf4e 200
173a8d04
LP
201 assert(s);
202
203 if (!s->what)
204 return 0;
205
61f9cf4e 206 p = swap_get_parameters(s);
d4a3494e 207 if (!p || !p->what)
f10af76d
LP
208 return 0;
209
61f9cf4e
LP
210 mask = s->from_proc_swaps ? UNIT_DEPENDENCY_PROC_SWAP : UNIT_DEPENDENCY_FILE;
211
44b0d1fd
LP
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 }
9b88bb50 219
61f9cf4e
LP
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);
173a8d04
LP
223}
224
2edd4434 225static int swap_add_default_dependencies(Swap *s) {
8bf23dc7
FB
226 int r;
227
2edd4434
LP
228 assert(s);
229
4c9ea260
LP
230 if (!UNIT(s)->default_dependencies)
231 return 0;
232
463d0d15 233 if (!MANAGER_IS_SYSTEM(UNIT(s)->manager))
6b1dc2bd 234 return 0;
2edd4434 235
75f86906 236 if (detect_container() > 0)
c0387ebf
LP
237 return 0;
238
8bf23dc7
FB
239 /* swap units generated for the swap dev links are missing the
240 * ordering dep against the swap target. */
35d8c19a 241 r = unit_add_dependency_by_name(UNIT(s), UNIT_BEFORE, SPECIAL_SWAP_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
8bf23dc7
FB
242 if (r < 0)
243 return r;
244
84214541 245 return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
2edd4434
LP
246}
247
4e85aff4 248static int swap_verify(Swap *s) {
7fd1b19b 249 _cleanup_free_ char *e = NULL;
7410616c 250 int r;
4e85aff4 251
e9fa1bf7 252 assert(s);
75193d41 253 assert(UNIT(s)->load_state == UNIT_LOADED);
4e85aff4 254
7410616c
LP
255 r = unit_name_from_path(s->what, ".swap", &e);
256 if (r < 0)
f2341e0a 257 return log_unit_error_errno(UNIT(s), r, "Failed to generate unit name from path: %m");
4e85aff4 258
d85ff944
YW
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.");
4e85aff4
LP
261
262 return 0;
263}
264
9670d583 265static int swap_load_devnode(Swap *s) {
ca822829 266 _cleanup_free_ char *p = NULL;
9670d583 267 struct stat st;
e5ca27b7 268 int r;
9670d583
LP
269
270 assert(s);
271
272 if (stat(s->what, &st) < 0 || !S_ISBLK(st.st_mode))
273 return 0;
274
b8a3f619 275 r = devname_from_stat_rdev(&st, &p);
e5ca27b7 276 if (r < 0) {
8ed6f81b 277 log_unit_full_errno(UNIT(s), r == -ENOENT ? LOG_DEBUG : LOG_WARNING, r,
ca822829 278 "Failed to get device node for swap %s: %m", s->what);
9670d583 279 return 0;
e5ca27b7 280 }
9670d583 281
9670d583
LP
282 return swap_set_devnode(s, p);
283}
284
15332d73 285static int swap_add_extras(Swap *s) {
07b0b134 286 int r;
07b0b134
ML
287
288 assert(s);
07b0b134 289
15332d73
LP
290 if (UNIT(s)->fragment_path)
291 s->from_fragment = true;
07b0b134 292
15332d73
LP
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);
5bcb0f2b 300 if (r < 0)
4e85aff4 301 return r;
5bcb0f2b 302 }
4e85aff4 303
15332d73
LP
304 if (!s->what)
305 return -ENOMEM;
306 }
07b0b134 307
4ff361cc 308 path_simplify(s->what);
07b0b134 309
15332d73
LP
310 if (!UNIT(s)->description) {
311 r = unit_set_description(UNIT(s), s->what);
9670d583
LP
312 if (r < 0)
313 return r;
15332d73 314 }
9670d583 315
9e615fa3 316 r = unit_add_mounts_for(UNIT(s), s->what, UNIT_DEPENDENCY_IMPLICIT, UNIT_MOUNT_REQUIRES);
15332d73
LP
317 if (r < 0)
318 return r;
598459ce 319
15332d73
LP
320 r = swap_add_device_dependencies(s);
321 if (r < 0)
322 return r;
598459ce 323
15332d73
LP
324 r = swap_load_devnode(s);
325 if (r < 0)
326 return r;
a016b922 327
15332d73
LP
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) {
e9fa1bf7
MY
348 Swap *s = ASSERT_PTR(SWAP(u));
349 int r;
15332d73 350
15332d73
LP
351 assert(u->load_state == UNIT_STUB);
352
353 /* Load a .swap file */
4ecb673e 354 r = unit_load_fragment_and_dropin(u, /* fragment_required = */ !s->from_proc_swaps);
15332d73 355
75193d41
ZJS
356 /* Add in some extras, and do so either when we successfully loaded something or when /proc/swaps is
357 * already active. */
06721f39 358 if (u->load_state == UNIT_LOADED || s->from_proc_swaps)
4ecb673e 359 RET_GATHER(r, swap_add_extras(s));
15332d73 360
06721f39
LP
361 if (r < 0)
362 return r;
4ecb673e 363
75193d41
ZJS
364 if (u->load_state != UNIT_LOADED)
365 return 0;
07b0b134
ML
366
367 return swap_verify(s);
368}
369
628c89cc 370static int swap_setup_unit(
4e85aff4
LP
371 Manager *m,
372 const char *what,
e04aad61 373 const char *what_proc_swaps,
4e85aff4 374 int priority,
e04aad61
LP
375 bool set_flags) {
376
bb33c5da 377 _cleanup_(unit_freep) Unit *new_unit = NULL;
7fd1b19b 378 _cleanup_free_ char *e = NULL;
e9fa1bf7
MY
379 Unit *u;
380 Swap *s;
e9fa1bf7 381 int r;
4e85aff4
LP
382
383 assert(m);
384 assert(what);
6b1dc2bd 385 assert(what_proc_swaps);
07b0b134 386
7410616c
LP
387 r = unit_name_from_path(what, ".swap", &e);
388 if (r < 0)
e9fa1bf7 389 return log_error_errno(r, "Failed to generate unit name from path: %m");
07b0b134 390
e04aad61 391 u = manager_get_unit(m, e);
e9fa1bf7
MY
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))
ba31a501
MY
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);
e9fa1bf7 400 } else {
bb33c5da 401 r = unit_new_for_name(m, sizeof(Swap), e, &new_unit);
ba31a501
MY
402 if (r < 0)
403 return log_warning_errno(r, "Failed to load swap unit '%s': %m", e);
e04aad61 404
bb33c5da 405 u = new_unit;
e9fa1bf7
MY
406 s = ASSERT_PTR(SWAP(u));
407
408 s->what = strdup(what);
ba31a501
MY
409 if (!s->what)
410 return log_oom();
e9fa1bf7 411 }
07b0b134 412
ba31a501 413 SwapParameters *p = &s->parameters_proc_swaps;
07b0b134 414
ba31a501 415 if (!p->what) {
5bcb0f2b 416 p->what = strdup(what_proc_swaps);
ba31a501
MY
417 if (!p->what)
418 return log_oom();
6b1dc2bd 419 }
e04aad61 420
fee2f5ca
YW
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. */
dc4c5871 423 if (UNIT_IS_LOAD_ERROR(u->load_state)) {
fee2f5ca 424 u->load_state = UNIT_STUB;
46f94480
LP
425 u->load_error = 0;
426 }
427
fee2f5ca
YW
428 unit_add_to_load_queue(u);
429
6b1dc2bd 430 if (set_flags) {
e9fa1bf7 431 s->is_active = true;
ba31a501 432 s->just_activated = !s->from_proc_swaps;
4e85aff4 433 }
07b0b134 434
e9fa1bf7 435 s->from_proc_swaps = true;
6b1dc2bd 436
4e85aff4 437 p->priority = priority;
7477451b 438 p->priority_set = true;
07b0b134 439
4e85aff4 440 unit_add_to_dbus_queue(u);
bb33c5da 441 TAKE_PTR(new_unit);
abef0ec3 442
07b0b134 443 return 0;
07b0b134
ML
444}
445
6aeb8c89 446static void swap_process_new(Manager *m, const char *device, int prio, bool set_flags) {
4366e598 447 _cleanup_(sd_device_unrefp) sd_device *d = NULL;
a1af8372 448 const char *dn;
4366e598 449 struct stat st, st_link;
5bcb0f2b 450 int r;
e04aad61
LP
451
452 assert(m);
453
6aeb8c89
LP
454 if (swap_setup_unit(m, device, device, prio, set_flags) < 0)
455 return;
e04aad61 456
5bcb0f2b
LP
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))
6aeb8c89 460 return;
e04aad61 461
a1130022 462 r = sd_device_new_from_stat_rdev(&d, &st);
6aeb8c89
LP
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);
e04aad61 466
5bcb0f2b 467 /* Add the main device node */
4366e598 468 if (sd_device_get_devname(d, &dn) >= 0 && !streq(dn, device))
6aeb8c89 469 (void) swap_setup_unit(m, dn, device, prio, set_flags);
e04aad61 470
5bcb0f2b 471 /* Add additional units for all symlinks */
4366e598 472 FOREACH_DEVICE_DEVLINK(d, devlink) {
e04aad61 473
5bcb0f2b 474 /* Don't bother with the /dev/block links */
4366e598 475 if (streq(devlink, device))
5bcb0f2b 476 continue;
e04aad61 477
4366e598 478 if (path_startswith(devlink, "/dev/block/"))
5bcb0f2b 479 continue;
e04aad61 480
4366e598
YW
481 if (stat(devlink, &st_link) >= 0 &&
482 (!S_ISBLK(st_link.st_mode) ||
483 st_link.st_rdev != st.st_rdev))
484 continue;
e04aad61 485
6aeb8c89 486 (void) swap_setup_unit(m, devlink, device, prio, set_flags);
e04aad61 487 }
e04aad61
LP
488}
489
07b0b134
ML
490static void swap_set_state(Swap *s, SwapState state) {
491 SwapState old_state;
e04aad61 492
07b0b134
ML
493 assert(s);
494
6fcbec6f
LP
495 if (s->state != state)
496 bus_unit_send_pending_change_signal(UNIT(s), false);
497
07b0b134
ML
498 old_state = s->state;
499 s->state = state;
500
dedf3719 501 if (!SWAP_STATE_WITH_PROCESS(state)) {
5dcadb4c 502 s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source);
e04aad61
LP
503 swap_unwatch_control_pid(s);
504 s->control_command = NULL;
505 s->control_command_id = _SWAP_EXEC_COMMAND_INVALID;
506 }
507
07b0b134 508 if (state != old_state)
f2341e0a 509 log_unit_debug(UNIT(s), "Changed %s -> %s", swap_state_to_string(old_state), swap_state_to_string(state));
07b0b134 510
96b09de5 511 unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], /* reload_success = */ true);
37cf8fee
LP
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);
07b0b134
ML
521}
522
be847e82 523static int swap_coldplug(Unit *u) {
e9fa1bf7 524 Swap *s = ASSERT_PTR(SWAP(u));
07b0b134 525 SwapState new_state = SWAP_DEAD;
e04aad61 526 int r;
07b0b134 527
07b0b134
ML
528 assert(s->state == SWAP_DEAD);
529
530 if (s->deserialized_state != s->state)
531 new_state = s->deserialized_state;
4e85aff4 532 else if (s->from_proc_swaps)
07b0b134
ML
533 new_state = SWAP_ACTIVE;
534
5bcb0f2b
LP
535 if (new_state == s->state)
536 return 0;
e04aad61 537
436cdf0a 538 if (pidref_is_set(&s->control_pid) &&
4d9f092b 539 pidref_is_unwaited(&s->control_pid) > 0 &&
dedf3719 540 SWAP_STATE_WITH_PROCESS(new_state)) {
e04aad61 541
495e75ed 542 r = unit_watch_pidref(UNIT(s), &s->control_pid, /* exclusive= */ false);
5bcb0f2b
LP
543 if (r < 0)
544 return r;
e04aad61 545
e9276800 546 r = swap_arm_timer(s, /* relative= */ false, usec_add(u->state_change_timestamp.monotonic, s->timeout_usec));
5bcb0f2b
LP
547 if (r < 0)
548 return r;
e04aad61 549 }
07b0b134 550
f26b2ec4 551 if (!IN_SET(new_state, SWAP_DEAD, SWAP_FAILED))
e8a565cb 552 (void) unit_setup_exec_runtime(u);
29206d46 553
5bcb0f2b 554 swap_set_state(s, new_state);
07b0b134
ML
555 return 0;
556}
557
558static void swap_dump(Unit *u, FILE *f, const char *prefix) {
e9fa1bf7 559 Swap *s = ASSERT_PTR(SWAP(u));
4e85aff4 560 SwapParameters *p;
b9e4d9ba 561 const char *prefix2;
07b0b134 562
4e85aff4
LP
563 assert(f);
564
b9e4d9ba
LP
565 prefix = strempty(prefix);
566 prefix2 = strjoina(prefix, "\t");
567
4e85aff4
LP
568 if (s->from_proc_swaps)
569 p = &s->parameters_proc_swaps;
570 else if (s->from_fragment)
571 p = &s->parameters_fragment;
b6bfc7bb
LP
572 else
573 p = NULL;
07b0b134
ML
574
575 fprintf(f,
4e85aff4 576 "%sSwap State: %s\n"
e1770af8 577 "%sResult: %s\n"
a8b689b7 578 "%sClean Result: %s\n"
07b0b134 579 "%sWhat: %s\n"
4e85aff4 580 "%sFrom /proc/swaps: %s\n"
39c79477
ZJS
581 "%sFrom fragment: %s\n"
582 "%sExtrinsic: %s\n",
07b0b134 583 prefix, swap_state_to_string(s->state),
e1770af8 584 prefix, swap_result_to_string(s->result),
a8b689b7 585 prefix, swap_result_to_string(s->clean_result),
07b0b134 586 prefix, s->what,
4e85aff4 587 prefix, yes_no(s->from_proc_swaps),
39c79477
ZJS
588 prefix, yes_no(s->from_fragment),
589 prefix, yes_no(swap_is_extrinsic(u)));
e04aad61 590
9670d583
LP
591 if (s->devnode)
592 fprintf(f, "%sDevice Node: %s\n", prefix, s->devnode);
593
b6bfc7bb
LP
594 if (p)
595 fprintf(f,
596 "%sPriority: %i\n"
47cb901e 597 "%sOptions: %s\n",
b6bfc7bb 598 prefix, p->priority,
47cb901e 599 prefix, strempty(p->options));
b6bfc7bb 600
9bd0e1b8
YW
601 fprintf(f,
602 "%sTimeoutSec: %s\n",
5291f26d 603 prefix, FORMAT_TIMESPAN(s->timeout_usec, USEC_PER_SEC));
9bd0e1b8 604
436cdf0a 605 if (pidref_is_set(&s->control_pid))
e04aad61 606 fprintf(f,
de0671ee 607 "%sControl PID: "PID_FMT"\n",
436cdf0a 608 prefix, s->control_pid.pid);
e04aad61
LP
609
610 exec_context_dump(&s->exec_context, f, prefix);
4819ff03 611 kill_context_dump(&s->kill_context, f, prefix);
bc0623df 612 cgroup_context_dump(UNIT(s), f, prefix);
b9e4d9ba
LP
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",
1ae9b0cf 619 prefix, glyph(GLYPH_ARROW_RIGHT), swap_exec_command_to_string(c));
b9e4d9ba
LP
620
621 exec_command_dump(s->exec_command + c, f, prefix2);
622 }
e04aad61
LP
623}
624
436cdf0a 625static int swap_spawn(Swap *s, ExecCommand *c, PidRef *ret_pid) {
fba173ff 626 _cleanup_(exec_params_shallow_clear) ExecParameters exec_params = EXEC_PARAMETERS_INIT(
b646fc32 627 EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN);
436cdf0a 628 _cleanup_(pidref_done) PidRef pidref = PIDREF_NULL;
3c7416b6 629 int r;
e04aad61
LP
630
631 assert(s);
632 assert(c);
436cdf0a 633 assert(ret_pid);
e04aad61 634
3c7416b6 635 r = unit_prepare_exec(UNIT(s));
29206d46 636 if (r < 0)
3c7416b6 637 return r;
29206d46 638
e9276800 639 r = swap_arm_timer(s, /* relative= */ true, s->timeout_usec);
646134dc 640 if (r < 0)
894a30ef 641 return r;
e04aad61 642
1ad6e8b3
LP
643 r = unit_set_exec_params(UNIT(s), &exec_params);
644 if (r < 0)
894a30ef 645 return r;
9fa95f85 646
8144537a
ŁS
647 /* Assume the label inherited from systemd as the fallback */
648 exec_params.fallback_smack_process_label = NULL;
649
f2341e0a
LP
650 r = exec_spawn(UNIT(s),
651 c,
646134dc 652 &s->exec_context,
9fa95f85 653 &exec_params,
613b411c 654 s->exec_runtime,
6bb00842 655 &s->cgroup_context,
556d2bc4 656 &pidref);
646134dc 657 if (r < 0)
894a30ef 658 return r;
e04aad61 659
495e75ed 660 r = unit_watch_pidref(UNIT(s), &pidref, /* exclusive= */ true);
436cdf0a 661 if (r < 0)
894a30ef 662 return r;
e04aad61 663
436cdf0a 664 *ret_pid = TAKE_PIDREF(pidref);
e04aad61 665 return 0;
07b0b134
ML
666}
667
e1770af8 668static void swap_enter_dead(Swap *s, SwapResult f) {
07b0b134
ML
669 assert(s);
670
a0fef983 671 if (s->result == SWAP_SUCCESS)
e1770af8 672 s->result = f;
e04aad61 673
aac99f30 674 unit_log_result(UNIT(s), s->result == SWAP_SUCCESS, swap_result_to_string(s->result));
95e631da
MY
675 unit_warn_leftover_processes(UNIT(s), /* start = */ false);
676
29206d46
LP
677 swap_set_state(s, s->result != SWAP_SUCCESS ? SWAP_FAILED : SWAP_DEAD);
678
28135da3 679 s->exec_runtime = exec_runtime_destroy(s->exec_runtime);
613b411c 680
703b1b7f 681 unit_destroy_runtime_data(UNIT(s), &s->exec_context, /* destroy_runtime_dir = */ true);
e66cf1a3 682
00d9ef85 683 unit_unref_uid_gid(UNIT(s), true);
07b0b134
ML
684}
685
e1770af8 686static void swap_enter_active(Swap *s, SwapResult f) {
e04aad61
LP
687 assert(s);
688
a0fef983 689 if (s->result == SWAP_SUCCESS)
e1770af8 690 s->result = f;
e04aad61
LP
691
692 swap_set_state(s, SWAP_ACTIVE);
693}
694
50864457
LP
695static void swap_enter_dead_or_active(Swap *s, SwapResult f) {
696 assert(s);
697
9c1f969d 698 if (s->from_proc_swaps) {
50864457 699 swap_enter_active(s, f);
9c1f969d
HD
700
701 LIST_FOREACH_OTHERS(same_devnode, other, s)
702 if (UNIT(other)->job)
703 swap_enter_dead_or_active(other, f);
704 } else
50864457
LP
705 swap_enter_dead(s, f);
706}
707
a232ebcc
ZJS
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
e1770af8 719static void swap_enter_signal(Swap *s, SwapState state, SwapResult f) {
07b0b134
ML
720 int r;
721
722 assert(s);
e04aad61 723
a0fef983 724 if (s->result == SWAP_SUCCESS)
e1770af8 725 s->result = f;
e04aad61 726
b826e317 727 r = unit_kill_context(UNIT(s), state_to_kill_operation(s, state));
b0ff5837
LP
728 if (r < 0) {
729 log_unit_warning_errno(UNIT(s), r, "Failed to kill processes: %m");
cd2086fe 730 goto fail;
b0ff5837 731 }
e04aad61 732
cd2086fe 733 if (r > 0) {
e9276800 734 r = swap_arm_timer(s, /* relative= */ true, s->timeout_usec);
b0ff5837
LP
735 if (r < 0) {
736 log_unit_warning_errno(UNIT(s), r, "Failed to install timer: %m");
e04aad61 737 goto fail;
b0ff5837 738 }
e04aad61
LP
739
740 swap_set_state(s, state);
50864457 741 } else if (state == SWAP_DEACTIVATING_SIGTERM && s->kill_context.send_sigkill)
ac84d1fb
LP
742 swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, SWAP_SUCCESS);
743 else
50864457 744 swap_enter_dead_or_active(s, SWAP_SUCCESS);
e04aad61
LP
745
746 return;
747
748fail:
50864457 749 swap_enter_dead_or_active(s, SWAP_FAILURE_RESOURCES);
e04aad61
LP
750}
751
752static void swap_enter_activating(Swap *s) {
bf1d7ba7
KZ
753 _cleanup_free_ char *opts = NULL;
754 int r;
e04aad61
LP
755
756 assert(s);
757
95e631da 758 unit_warn_leftover_processes(UNIT(s), /* start = */ true);
a4634b21 759
e04aad61
LP
760 s->control_command_id = SWAP_EXEC_ACTIVATE;
761 s->control_command = s->exec_command + SWAP_EXEC_ACTIVATE;
07b0b134 762
86b23b07 763 if (s->from_fragment) {
7477451b 764 int priority = 0;
47cb901e 765
bf1d7ba7
KZ
766 r = fstab_find_pri(s->parameters_fragment.options, &priority);
767 if (r < 0)
af4454cb
LP
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.");
bf1d7ba7 771
7477451b 772 if (r <= 0 && s->parameters_fragment.priority_set) {
bf1d7ba7
KZ
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);
6fca66a7 777 if (r < 0) {
b0ff5837 778 r = log_oom();
bf1d7ba7 779 goto fail;
6fca66a7 780 }
e64d5235 781 }
86b23b07
JS
782 }
783
cc137d53 784 r = exec_command_set(s->control_command, "/sbin/swapon", "--fixpgsz", NULL);
b0ff5837
LP
785 if (r < 0) {
786 log_unit_warning_errno(UNIT(s), r, "Failed to initialize swapon command line: %m");
86b23b07 787 goto fail;
b0ff5837 788 }
4e85aff4 789
bf1d7ba7
KZ
790 if (s->parameters_fragment.options || opts) {
791 r = exec_command_append(s->control_command, "-o",
af4454cb 792 opts ?: s->parameters_fragment.options, NULL);
b0ff5837
LP
793 if (r < 0) {
794 log_unit_warning_errno(UNIT(s), r, "Failed to prepare swapon command line: %m");
86b23b07 795 goto fail;
b0ff5837 796 }
86b23b07 797 }
e04aad61 798
86b23b07 799 r = exec_command_append(s->control_command, s->what, NULL);
b0ff5837
LP
800 if (r < 0) {
801 log_unit_warning_errno(UNIT(s), r, "Failed to prepare swapon command line: %m");
e04aad61 802 goto fail;
b0ff5837 803 }
e04aad61
LP
804
805 swap_unwatch_control_pid(s);
806
646134dc 807 r = swap_spawn(s, s->control_command, &s->control_pid);
b0ff5837
LP
808 if (r < 0) {
809 log_unit_warning_errno(UNIT(s), r, "Failed to spawn 'swapon' task: %m");
e04aad61 810 goto fail;
b0ff5837 811 }
e04aad61
LP
812
813 swap_set_state(s, SWAP_ACTIVATING);
e04aad61
LP
814 return;
815
816fail:
50864457 817 swap_enter_dead_or_active(s, SWAP_FAILURE_RESOURCES);
e04aad61
LP
818}
819
e1770af8 820static void swap_enter_deactivating(Swap *s) {
e04aad61
LP
821 int r;
822
823 assert(s);
824
e04aad61
LP
825 s->control_command_id = SWAP_EXEC_DEACTIVATE;
826 s->control_command = s->exec_command + SWAP_EXEC_DEACTIVATE;
827
646134dc 828 r = exec_command_set(s->control_command,
e04aad61
LP
829 "/sbin/swapoff",
830 s->what,
646134dc 831 NULL);
b0ff5837
LP
832 if (r < 0) {
833 log_unit_warning_errno(UNIT(s), r, "Failed to prepare swapoff command line: %m");
e04aad61 834 goto fail;
b0ff5837 835 }
e04aad61
LP
836
837 swap_unwatch_control_pid(s);
838
646134dc 839 r = swap_spawn(s, s->control_command, &s->control_pid);
b0ff5837
LP
840 if (r < 0) {
841 log_unit_warning_errno(UNIT(s), r, "Failed to spawn 'swapoff' task: %m");
e04aad61 842 goto fail;
b0ff5837 843 }
e04aad61
LP
844
845 swap_set_state(s, SWAP_DEACTIVATING);
e04aad61
LP
846 return;
847
848fail:
50864457 849 swap_enter_dead_or_active(s, SWAP_FAILURE_RESOURCES);
e04aad61
LP
850}
851
31135818
LP
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);
9cc54544
LP
857
858 if (s->cgroup_runtime)
859 s->cgroup_runtime->reset_accounting = true;
31135818
LP
860}
861
e04aad61 862static int swap_start(Unit *u) {
03677889 863 Swap *s = SWAP(u);
07299350 864 int r;
e04aad61
LP
865
866 assert(s);
867
50864457 868 /* We cannot fulfill this request right now, try again later please! */
d31ae548
FB
869 if (IN_SET(s->state,
870 SWAP_DEACTIVATING,
871 SWAP_DEACTIVATING_SIGTERM,
a8b689b7
YW
872 SWAP_DEACTIVATING_SIGKILL,
873 SWAP_CLEANING))
e04aad61
LP
874 return -EAGAIN;
875
50864457 876 /* Already on it! */
e04aad61
LP
877 if (s->state == SWAP_ACTIVATING)
878 return 0;
879
d31ae548 880 assert(IN_SET(s->state, SWAP_DEAD, SWAP_FAILED));
e04aad61 881
75f86906 882 if (detect_container() > 0)
a5c3034f
LP
883 return -EPERM;
884
37cf8fee
LP
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
4b58153d
LP
892 r = unit_acquire_invocation_id(u);
893 if (r < 0)
894 return r;
895
31135818 896 swap_cycle_clear(s);
e04aad61 897 swap_enter_activating(s);
82a2b6bb 898 return 1;
07b0b134
ML
899}
900
901static int swap_stop(Unit *u) {
e9fa1bf7 902 Swap *s = ASSERT_PTR(SWAP(u));
07b0b134 903
50864457
LP
904 switch (s->state) {
905
906 case SWAP_DEACTIVATING:
907 case SWAP_DEACTIVATING_SIGTERM:
908 case SWAP_DEACTIVATING_SIGKILL:
909 /* Already on it */
e04aad61 910 return 0;
07b0b134 911
50864457
LP
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;
07b0b134 917
50864457
LP
918 case SWAP_ACTIVE:
919 if (detect_container() > 0)
920 return -EPERM;
a5c3034f 921
50864457
LP
922 swap_enter_deactivating(s);
923 return 1;
924
a8b689b7
YW
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
50864457 930 default:
04499a70 931 assert_not_reached();
50864457 932 }
07b0b134
ML
933}
934
935static int swap_serialize(Unit *u, FILE *f, FDSet *fds) {
e9fa1bf7 936 Swap *s = ASSERT_PTR(SWAP(u));
07b0b134 937
07b0b134
ML
938 assert(f);
939 assert(fds);
940
d68c645b
LP
941 (void) serialize_item(f, "state", swap_state_to_string(s->state));
942 (void) serialize_item(f, "result", swap_result_to_string(s->result));
2a7451dc 943 (void) serialize_pidref(f, fds, "control-pid", &s->control_pid);
e04aad61
LP
944
945 if (s->control_command_id >= 0)
d68c645b 946 (void) serialize_item(f, "control-command", swap_exec_command_to_string(s->control_command_id));
07b0b134
ML
947
948 return 0;
949}
950
951static int swap_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
e9fa1bf7 952 Swap *s = ASSERT_PTR(SWAP(u));
07b0b134 953
07b0b134
ML
954 assert(fds);
955
956 if (streq(key, "state")) {
957 SwapState state;
958
646134dc
ZJS
959 state = swap_state_from_string(value);
960 if (state < 0)
f2341e0a 961 log_unit_debug(u, "Failed to parse state value: %s", value);
07b0b134
ML
962 else
963 s->deserialized_state = state;
e1770af8
LP
964 } else if (streq(key, "result")) {
965 SwapResult f;
966
967 f = swap_result_from_string(value);
968 if (f < 0)
f2341e0a 969 log_unit_debug(u, "Failed to parse result value: %s", value);
e1770af8
LP
970 else if (f != SWAP_SUCCESS)
971 s->result = f;
e04aad61 972 } else if (streq(key, "control-pid")) {
e04aad61 973
aaa872a7
DDM
974 if (!pidref_is_set(&s->control_pid))
975 (void) deserialize_pidref(fds, value, &s->control_pid);
e04aad61
LP
976
977 } else if (streq(key, "control-command")) {
978 SwapExecCommand id;
979
646134dc
ZJS
980 id = swap_exec_command_from_string(value);
981 if (id < 0)
f2341e0a 982 log_unit_debug(u, "Failed to parse exec-command value: %s", value);
e04aad61
LP
983 else {
984 s->control_command_id = id;
985 s->control_command = s->exec_command + id;
986 }
07b0b134 987 } else
f2341e0a 988 log_unit_debug(u, "Unknown serialization key: %s", key);
07b0b134
ML
989
990 return 0;
991}
992
e04aad61 993static void swap_sigchld_event(Unit *u, pid_t pid, int code, int status) {
e9fa1bf7 994 Swap *s = ASSERT_PTR(SWAP(u));
e1770af8 995 SwapResult f;
e04aad61 996
e04aad61
LP
997 assert(pid >= 0);
998
436cdf0a 999 if (pid != s->control_pid.pid)
e04aad61
LP
1000 return;
1001
bcce581d
LP
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
436cdf0a 1006 pidref_done(&s->control_pid);
e04aad61 1007
1f0958f6 1008 if (is_clean_exit(code, status, EXIT_CLEAN_COMMAND, NULL))
e1770af8
LP
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
04499a70 1017 assert_not_reached();
e1770af8 1018
a0fef983 1019 if (s->result == SWAP_SUCCESS)
e1770af8 1020 s->result = f;
e04aad61
LP
1021
1022 if (s->control_command) {
6ea832a2 1023 exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status);
e1770af8 1024
e04aad61
LP
1025 s->control_command = NULL;
1026 s->control_command_id = _SWAP_EXEC_COMMAND_INVALID;
1027 }
1028
91bbd9b7 1029 unit_log_process_exit(
5cc2cd1c 1030 u,
91bbd9b7
LP
1031 "Swap process",
1032 swap_exec_command_to_string(s->control_command_id),
5cc2cd1c 1033 f == SWAP_SUCCESS,
91bbd9b7 1034 code, status);
e04aad61
LP
1035
1036 switch (s->state) {
1037
1038 case SWAP_ACTIVATING:
5bcb0f2b 1039 case SWAP_ACTIVATING_DONE:
e04aad61 1040
50864457 1041 if (f == SWAP_SUCCESS || s->from_proc_swaps)
e1770af8 1042 swap_enter_active(s, f);
e04aad61 1043 else
e1770af8 1044 swap_enter_dead(s, f);
e04aad61
LP
1045 break;
1046
1047 case SWAP_DEACTIVATING:
1048 case SWAP_DEACTIVATING_SIGKILL:
1049 case SWAP_DEACTIVATING_SIGTERM:
1050
50864457 1051 swap_enter_dead_or_active(s, f);
e04aad61
LP
1052 break;
1053
a8b689b7
YW
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
e04aad61 1061 default:
04499a70 1062 assert_not_reached();
e04aad61
LP
1063 }
1064
1065 /* Notify clients about changed exit status */
1066 unit_add_to_dbus_queue(u);
e04aad61
LP
1067}
1068
718db961 1069static int swap_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
e9fa1bf7 1070 Swap *s = ASSERT_PTR(SWAP(userdata));
e04aad61 1071
718db961 1072 assert(s->timer_event_source == source);
e04aad61
LP
1073
1074 switch (s->state) {
1075
1076 case SWAP_ACTIVATING:
5bcb0f2b 1077 case SWAP_ACTIVATING_DONE:
f2341e0a 1078 log_unit_warning(UNIT(s), "Activation timed out. Stopping.");
50864457 1079 swap_enter_signal(s, SWAP_DEACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT);
e04aad61
LP
1080 break;
1081
1082 case SWAP_DEACTIVATING:
f2341e0a 1083 log_unit_warning(UNIT(s), "Deactivation timed out. Stopping.");
e1770af8 1084 swap_enter_signal(s, SWAP_DEACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT);
e04aad61
LP
1085 break;
1086
e04aad61 1087 case SWAP_DEACTIVATING_SIGTERM:
4819ff03 1088 if (s->kill_context.send_sigkill) {
50864457 1089 log_unit_warning(UNIT(s), "Swap process timed out. Killing.");
e1770af8 1090 swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, SWAP_FAILURE_TIMEOUT);
ba035df2 1091 } else {
50864457
LP
1092 log_unit_warning(UNIT(s), "Swap process timed out. Skipping SIGKILL. Ignoring.");
1093 swap_enter_dead_or_active(s, SWAP_FAILURE_TIMEOUT);
ba035df2 1094 }
e04aad61
LP
1095 break;
1096
e04aad61 1097 case SWAP_DEACTIVATING_SIGKILL:
f2341e0a 1098 log_unit_warning(UNIT(s), "Swap process still around after SIGKILL. Ignoring.");
50864457 1099 swap_enter_dead_or_active(s, SWAP_FAILURE_TIMEOUT);
e04aad61
LP
1100 break;
1101
a8b689b7
YW
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
e04aad61 1111 default:
04499a70 1112 assert_not_reached();
e04aad61 1113 }
718db961
LP
1114
1115 return 0;
e04aad61
LP
1116}
1117
1118static int swap_load_proc_swaps(Manager *m, bool set_flags) {
e04aad61
LP
1119 assert(m);
1120
07b0b134 1121 rewind(m->proc_swaps);
bab45044 1122
4e85aff4 1123 (void) fscanf(m->proc_swaps, "%*s %*s %*s %*s %*s\n");
07b0b134 1124
fe96c0f8 1125 for (unsigned i = 1;; i++) {
9fb3675e 1126 _cleanup_free_ char *dev = NULL, *d = NULL;
07b0b134
ML
1127 int prio = 0, k;
1128
646134dc
ZJS
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) {
07b0b134 1137 if (k == EOF)
4e85aff4 1138 break;
07b0b134 1139
b0ff5837 1140 log_warning("Failed to parse /proc/swaps:%u, skipping.", i);
e04aad61 1141 continue;
07b0b134 1142 }
07b0b134 1143
e437538f
ZJS
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");
628c89cc 1147
485ae697 1148 device_found_node(m, d, DEVICE_FOUND_SWAP, DEVICE_FOUND_SWAP);
4e85aff4 1149
eb04385d 1150 (void) swap_process_new(m, d, prio, set_flags);
07b0b134
ML
1151 }
1152
eb04385d 1153 return 0;
e04aad61
LP
1154}
1155
bcce581d 1156static int swap_process_proc_swaps(Manager *m) {
4e434314
LP
1157 int r;
1158
1159 assert(m);
4e434314 1160
646134dc
ZJS
1161 r = swap_load_proc_swaps(m, true);
1162 if (r < 0) {
e04aad61 1163 /* Reset flags, just in case, for late calls */
595ed347
MS
1164 LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) {
1165 Swap *swap = SWAP(u);
e04aad61 1166
c73f413d
FS
1167 assert(swap);
1168
e04aad61
LP
1169 swap->is_active = swap->just_activated = false;
1170 }
1171
1172 return 0;
1173 }
1174
1175 manager_dispatch_load_queue(m);
1176
595ed347
MS
1177 LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) {
1178 Swap *swap = SWAP(u);
e04aad61 1179
c73f413d
FS
1180 assert(swap);
1181
e04aad61 1182 if (!swap->is_active) {
e04aad61 1183
e04aad61
LP
1184 swap_unset_proc_swaps(swap);
1185
1186 switch (swap->state) {
1187
1188 case SWAP_ACTIVE:
ba6fbb2c 1189 /* This has just been deactivated */
e1770af8 1190 swap_enter_dead(swap, SWAP_SUCCESS);
e04aad61
LP
1191 break;
1192
1193 default:
5bcb0f2b 1194 /* Fire again */
e04aad61 1195 swap_set_state(swap, swap->state);
e04aad61
LP
1196 }
1197
628c89cc 1198 if (swap->what)
b1ba0ce8 1199 device_found_node(m, swap->what, DEVICE_NOT_FOUND, DEVICE_FOUND_SWAP);
628c89cc 1200
e04aad61
LP
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:
31135818
LP
1209 (void) unit_acquire_invocation_id(u);
1210 swap_cycle_clear(swap);
e1770af8 1211 swap_enter_active(swap, SWAP_SUCCESS);
e04aad61
LP
1212 break;
1213
5bcb0f2b
LP
1214 case SWAP_ACTIVATING:
1215 swap_set_state(swap, SWAP_ACTIVATING_DONE);
1216 break;
1217
e04aad61 1218 default:
5c9feb2d
YW
1219 /* Nothing really changed, but let's issue an notification call nonetheless,
1220 * in case somebody is waiting for this. */
e04aad61 1221 swap_set_state(swap, swap->state);
e04aad61
LP
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
bcce581d 1232static int swap_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
99534007 1233 Manager *m = ASSERT_PTR(userdata);
bcce581d 1234
bcce581d
LP
1235 assert(revents & EPOLLPRI);
1236
1237 return swap_process_proc_swaps(m);
1238}
1239
e9fa1bf7
MY
1240static Unit* swap_following(Unit *u) {
1241 Swap *s = ASSERT_PTR(SWAP(u));
03677889 1242 Swap *first = NULL;
e04aad61 1243
cdc89820
ZJS
1244 /* If the user configured the swap through /etc/fstab or
1245 * a device unit, follow that. */
1246
1247 if (s->from_fragment)
e04aad61
LP
1248 return NULL;
1249
caac2704 1250 LIST_FOREACH_OTHERS(same_devnode, other, s)
cdc89820
ZJS
1251 if (other->from_fragment)
1252 return UNIT(other);
1253
b938cb90 1254 /* Otherwise, make everybody follow the unit that's named after
cdc89820
ZJS
1255 * the swap device in the kernel */
1256
1257 if (streq_ptr(s->what, s->devnode))
1258 return NULL;
e04aad61 1259
bd335c96 1260 LIST_FOREACH(same_devnode, other, s->same_devnode_next)
9670d583 1261 if (streq_ptr(other->what, other->devnode))
e04aad61
LP
1262 return UNIT(other);
1263
bd335c96 1264 LIST_FOREACH_BACKWARDS(same_devnode, other, s->same_devnode_prev) {
9670d583 1265 if (streq_ptr(other->what, other->devnode))
e04aad61
LP
1266 return UNIT(other);
1267
1268 first = other;
1269 }
1270
cdc89820 1271 /* Fall back to the first on the list */
e04aad61 1272 return UNIT(first);
07b0b134
ML
1273}
1274
e9fa1bf7
MY
1275static int swap_following_set(Unit *u, Set **ret) {
1276 Swap *s = ASSERT_PTR(SWAP(u));
af4fa99d 1277 _cleanup_set_free_ Set *set = NULL;
6210e7fc
LP
1278 int r;
1279
e9fa1bf7 1280 assert(ret);
6210e7fc 1281
9670d583 1282 if (LIST_JUST_US(same_devnode, s)) {
e9fa1bf7 1283 *ret = NULL;
6210e7fc
LP
1284 return 0;
1285 }
1286
d5099efc 1287 set = set_new(NULL);
5bcb0f2b 1288 if (!set)
6210e7fc
LP
1289 return -ENOMEM;
1290
caac2704 1291 LIST_FOREACH_OTHERS(same_devnode, other, s) {
5bcb0f2b
LP
1292 r = set_put(set, other);
1293 if (r < 0)
95f14a3e 1294 return r;
5bcb0f2b 1295 }
6210e7fc 1296
e9fa1bf7 1297 *ret = TAKE_PTR(set);
6210e7fc 1298 return 1;
6210e7fc
LP
1299}
1300
07b0b134
ML
1301static void swap_shutdown(Manager *m) {
1302 assert(m);
1303
5dcadb4c 1304 m->swap_event_source = sd_event_source_disable_unref(m->swap_event_source);
74ca738f 1305 m->proc_swaps = safe_fclose(m->proc_swaps);
525d3cc7 1306 m->swaps_by_devnode = hashmap_free(m->swaps_by_devnode);
07b0b134
ML
1307}
1308
ba64af90 1309static void swap_enumerate(Manager *m) {
07b0b134 1310 int r;
9670d583 1311
07b0b134
ML
1312 assert(m);
1313
4e434314 1314 if (!m->proc_swaps) {
646134dc 1315 m->proc_swaps = fopen("/proc/swaps", "re");
ba64af90
LP
1316 if (!m->proc_swaps) {
1317 if (errno == ENOENT)
cb209a04 1318 log_debug_errno(errno, "Not swap enabled, skipping enumeration.");
ba64af90 1319 else
42ba9974 1320 log_warning_errno(errno, "Failed to open %s, ignoring: %m", "/proc/swaps");
ba64af90
LP
1321
1322 return;
1323 }
4e434314 1324
151b9b96 1325 r = sd_event_add_io(m->event, &m->swap_event_source, fileno(m->proc_swaps), EPOLLPRI, swap_dispatch_io, m);
ba64af90
LP
1326 if (r < 0) {
1327 log_error_errno(r, "Failed to watch /proc/swaps: %m");
29083707 1328 goto fail;
ba64af90 1329 }
29083707
LP
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. */
d42b61d2 1334 r = sd_event_source_set_priority(m->swap_event_source, EVENT_PRIORITY_SWAP_TABLE);
ba64af90
LP
1335 if (r < 0) {
1336 log_error_errno(r, "Failed to change /proc/swaps priority: %m");
718db961 1337 goto fail;
ba64af90 1338 }
7dfbe2e3
TG
1339
1340 (void) sd_event_source_set_description(m->swap_event_source, "swap-proc");
4e434314
LP
1341 }
1342
646134dc
ZJS
1343 r = swap_load_proc_swaps(m, false);
1344 if (r < 0)
718db961
LP
1345 goto fail;
1346
ba64af90 1347 return;
07b0b134 1348
718db961
LP
1349fail:
1350 swap_shutdown(m);
07b0b134
ML
1351}
1352
4366e598 1353int swap_process_device_new(Manager *m, sd_device *dev) {
9670d583 1354 _cleanup_free_ char *e = NULL;
a1af8372 1355 const char *dn;
cabf58b2 1356 Unit *u;
c53aafb7 1357 int r;
9670d583
LP
1358
1359 assert(m);
1360 assert(dev);
1361
e82c6e8b 1362 if (sd_device_get_devname(dev, &dn) < 0)
9670d583
LP
1363 return 0;
1364
7410616c 1365 r = unit_name_from_path(dn, ".swap", &e);
e82c6e8b
LP
1366 if (r < 0) {
1367 log_debug_errno(r, "Cannot convert device name '%s' to unit name, ignoring: %m", dn);
1368 return 0;
1369 }
9670d583 1370
cabf58b2
FB
1371 u = manager_get_unit(m, e);
1372 if (u)
1373 r = swap_set_devnode(SWAP(u), dn);
9670d583 1374
4366e598 1375 FOREACH_DEVICE_DEVLINK(dev, devlink) {
9670d583 1376 _cleanup_free_ char *n = NULL;
7410616c 1377 int q;
9670d583 1378
4366e598 1379 q = unit_name_from_path(devlink, ".swap", &n);
03e52e8c 1380 if (q == -EINVAL) /* If the name is not convertible to unit name, we can't manage it */
598a6a84 1381 continue;
7410616c
LP
1382 if (q < 0)
1383 return q;
9670d583 1384
cabf58b2
FB
1385 u = manager_get_unit(m, n);
1386 if (u) {
1387 q = swap_set_devnode(SWAP(u), dn);
9670d583
LP
1388 if (q < 0)
1389 r = q;
1390 }
1391 }
1392
1393 return r;
1394}
1395
4366e598 1396int swap_process_device_remove(Manager *m, sd_device *dev) {
9670d583 1397 const char *dn;
9670d583 1398 Swap *s;
4ecb673e 1399 int r;
9670d583 1400
4366e598
YW
1401 r = sd_device_get_devname(dev, &dn);
1402 if (r < 0)
9670d583
LP
1403 return 0;
1404
4ecb673e
MY
1405 r = 0;
1406 while ((s = hashmap_get(m->swaps_by_devnode, dn)))
1407 RET_GATHER(r, swap_set_devnode(s, NULL));
9670d583
LP
1408
1409 return r;
1410}
1411
fdf20a31 1412static void swap_reset_failed(Unit *u) {
e9fa1bf7 1413 Swap *s = ASSERT_PTR(SWAP(u));
5632e374 1414
fdf20a31 1415 if (s->state == SWAP_FAILED)
5632e374 1416 swap_set_state(s, SWAP_DEAD);
e04aad61 1417
e1770af8 1418 s->result = SWAP_SUCCESS;
a8b689b7 1419 s->clean_result = SWAP_SUCCESS;
5632e374
LP
1420}
1421
2b532181
LP
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
7a7821c8 1438static int swap_get_timeout(Unit *u, usec_t *timeout) {
e9fa1bf7 1439 Swap *s = ASSERT_PTR(SWAP(u));
7a7821c8 1440 usec_t t;
68db7a3b
ZJS
1441 int r;
1442
1443 if (!s->timer_event_source)
1444 return 0;
1445
7a7821c8 1446 r = sd_event_source_get_time(s->timer_event_source, &t);
68db7a3b
ZJS
1447 if (r < 0)
1448 return r;
7a7821c8
LP
1449 if (t == USEC_INFINITY)
1450 return 0;
68db7a3b 1451
7a7821c8 1452 *timeout = t;
68db7a3b
ZJS
1453 return 1;
1454}
1455
1c2e9646 1456static bool swap_supported(void) {
0faacd47
LP
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 &&
75f86906 1466 detect_container() <= 0;
0faacd47
LP
1467
1468 return supported;
1469}
1470
37eb258e
LP
1471static PidRef* swap_control_pid(Unit *u) {
1472 return &ASSERT_PTR(SWAP(u))->control_pid;
291d565a
LP
1473}
1474
a8b689b7 1475static int swap_clean(Unit *u, ExecCleanMask mask) {
e9fa1bf7 1476 Swap *s = ASSERT_PTR(SWAP(u));
a8b689b7 1477 _cleanup_strv_free_ char **l = NULL;
a8b689b7
YW
1478 int r;
1479
a8b689b7
YW
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
e9276800 1497 r = swap_arm_timer(s, /* relative= */ true, s->exec_context.timeout_clean_usec);
b0ff5837
LP
1498 if (r < 0) {
1499 log_unit_warning_errno(u, r, "Failed to install timer: %m");
a8b689b7 1500 goto fail;
b0ff5837 1501 }
a8b689b7 1502
4775b55d 1503 r = unit_fork_and_watch_rm_rf(u, l, &s->control_pid);
b0ff5837
LP
1504 if (r < 0) {
1505 log_unit_warning_errno(u, r, "Failed to spawn cleaning task: %m");
436cdf0a 1506 goto fail;
b0ff5837 1507 }
a8b689b7 1508
436cdf0a 1509 swap_set_state(s, SWAP_CLEANING);
a8b689b7
YW
1510 return 0;
1511
1512fail:
a8b689b7 1513 s->clean_result = SWAP_FAILURE_RESOURCES;
5dcadb4c 1514 s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source);
a8b689b7
YW
1515 return r;
1516}
1517
1518static int swap_can_clean(Unit *u, ExecCleanMask *ret) {
e9fa1bf7 1519 Swap *s = ASSERT_PTR(SWAP(u));
a8b689b7
YW
1520
1521 return exec_context_get_clean_mask(&s->exec_context, ret);
1522}
1523
705578c3 1524static int swap_can_start(Unit *u) {
e9fa1bf7 1525 Swap *s = ASSERT_PTR(SWAP(u));
9727f242
DDM
1526 int r;
1527
9727f242
DDM
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
705578c3 1534 return 1;
9727f242
DDM
1535}
1536
f57cc32f
DDM
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
e04aad61 1558static const char* const swap_exec_command_table[_SWAP_EXEC_COMMAND_MAX] = {
48d83e33 1559 [SWAP_EXEC_ACTIVATE] = "ExecActivate",
e04aad61
LP
1560 [SWAP_EXEC_DEACTIVATE] = "ExecDeactivate",
1561};
1562
1563DEFINE_STRING_TABLE_LOOKUP(swap_exec_command, SwapExecCommand);
1564
e1770af8 1565static const char* const swap_result_table[_SWAP_RESULT_MAX] = {
48d83e33
ZJS
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",
07299350 1572 [SWAP_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
e1770af8
LP
1573};
1574
1575DEFINE_STRING_TABLE_LOOKUP(swap_result, SwapResult);
1576
07b0b134 1577const UnitVTable swap_vtable = {
7d17cfbc 1578 .object_size = sizeof(Swap),
718db961
LP
1579 .exec_context_offset = offsetof(Swap, exec_context),
1580 .cgroup_context_offset = offsetof(Swap, cgroup_context),
1581 .kill_context_offset = offsetof(Swap, kill_context),
613b411c 1582 .exec_runtime_offset = offsetof(Swap, exec_runtime),
9cc54544 1583 .cgroup_runtime_offset = offsetof(Swap, cgroup_runtime),
3ef63c31 1584
f975e971
LP
1585 .sections =
1586 "Unit\0"
1587 "Swap\0"
1588 "Install\0",
4ad49000 1589 .private_section = "Swap",
71645aca 1590
c80a9a33
LP
1591 .can_fail = true,
1592
4e85aff4 1593 .init = swap_init,
07b0b134 1594 .load = swap_load,
6e620bec 1595 .done = swap_done,
07b0b134
ML
1596
1597 .coldplug = swap_coldplug,
1598
1599 .dump = swap_dump,
1600
1601 .start = swap_start,
1602 .stop = swap_stop,
1603
a8b689b7
YW
1604 .clean = swap_clean,
1605 .can_clean = swap_can_clean,
8a0867d6 1606
68db7a3b
ZJS
1607 .get_timeout = swap_get_timeout,
1608
07b0b134
ML
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
52a12341
YW
1615 .will_restart = unit_will_restart_default,
1616
f2f725e5 1617 .may_gc = swap_may_gc,
39c79477 1618 .is_extrinsic = swap_is_extrinsic,
07b0b134 1619
e04aad61 1620 .sigchld_event = swap_sigchld_event,
e04aad61
LP
1621
1622 .reset_failed = swap_reset_failed,
1623
2b532181
LP
1624 .notify_handoff_timestamp = swap_handoff_timestamp,
1625
291d565a
LP
1626 .control_pid = swap_control_pid,
1627
74c964d3
LP
1628 .bus_set_property = bus_swap_set_property,
1629 .bus_commit_properties = bus_swap_commit_properties,
07b0b134 1630
e04aad61 1631 .following = swap_following,
6210e7fc 1632 .following_set = swap_following_set,
5632e374 1633
6e620bec 1634 .enumerate = swap_enumerate,
c6918296 1635 .shutdown = swap_shutdown,
0faacd47 1636 .supported = swap_supported,
c6918296
MS
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.",
c6918296
MS
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 },
9727f242 1654
705578c3 1655 .can_start = swap_can_start,
b2bfd121
LP
1656
1657 .notify_plymouth = true,
07b0b134 1658};