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db9ecf05 | 1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
07b0b134 ML |
2 | |
3 | #include <errno.h> | |
07b0b134 ML |
4 | #include <sys/epoll.h> |
5 | #include <sys/stat.h> | |
4f5dd394 | 6 | #include <unistd.h> |
07b0b134 | 7 | |
4366e598 | 8 | #include "sd-device.h" |
b4bbcaa9 | 9 | |
b5efdb8a | 10 | #include "alloc-util.h" |
07b0b134 | 11 | #include "dbus-swap.h" |
6fcbec6f | 12 | #include "dbus-unit.h" |
4366e598 YW |
13 | #include "device-private.h" |
14 | #include "device-util.h" | |
57b7a260 | 15 | #include "device.h" |
4f5dd394 | 16 | #include "escape.h" |
9a57c629 | 17 | #include "exit-status.h" |
3ffd4af2 | 18 | #include "fd-util.h" |
f97b34a6 | 19 | #include "format-util.h" |
4f5dd394 | 20 | #include "fstab-util.h" |
6bedfcbb | 21 | #include "parse-util.h" |
9eb977db | 22 | #include "path-util.h" |
7b3e062c | 23 | #include "process-util.h" |
d68c645b | 24 | #include "serialize.h" |
4f5dd394 | 25 | #include "special.h" |
8b43440b | 26 | #include "string-table.h" |
07630cea | 27 | #include "string-util.h" |
3ffd4af2 | 28 | #include "swap.h" |
4f5dd394 LP |
29 | #include "unit-name.h" |
30 | #include "unit.h" | |
31 | #include "virt.h" | |
07b0b134 ML |
32 | |
33 | static const UnitActiveState state_translation_table[_SWAP_STATE_MAX] = { | |
34 | [SWAP_DEAD] = UNIT_INACTIVE, | |
e04aad61 | 35 | [SWAP_ACTIVATING] = UNIT_ACTIVATING, |
5bcb0f2b | 36 | [SWAP_ACTIVATING_DONE] = UNIT_ACTIVE, |
07b0b134 | 37 | [SWAP_ACTIVE] = UNIT_ACTIVE, |
e04aad61 | 38 | [SWAP_DEACTIVATING] = UNIT_DEACTIVATING, |
e04aad61 LP |
39 | [SWAP_DEACTIVATING_SIGTERM] = UNIT_DEACTIVATING, |
40 | [SWAP_DEACTIVATING_SIGKILL] = UNIT_DEACTIVATING, | |
a8b689b7 YW |
41 | [SWAP_FAILED] = UNIT_FAILED, |
42 | [SWAP_CLEANING] = UNIT_MAINTENANCE, | |
07b0b134 ML |
43 | }; |
44 | ||
718db961 LP |
45 | static int swap_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata); |
46 | static int swap_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata); | |
bcce581d | 47 | static int swap_process_proc_swaps(Manager *m); |
718db961 | 48 | |
dedf3719 LP |
49 | static bool SWAP_STATE_WITH_PROCESS(SwapState state) { |
50 | return IN_SET(state, | |
51 | SWAP_ACTIVATING, | |
52 | SWAP_ACTIVATING_DONE, | |
53 | SWAP_DEACTIVATING, | |
54 | SWAP_DEACTIVATING_SIGTERM, | |
a8b689b7 YW |
55 | SWAP_DEACTIVATING_SIGKILL, |
56 | SWAP_CLEANING); | |
dedf3719 LP |
57 | } |
58 | ||
39c79477 ZJS |
59 | _pure_ static UnitActiveState swap_active_state(Unit *u) { |
60 | assert(u); | |
61 | ||
62 | return state_translation_table[SWAP(u)->state]; | |
63 | } | |
64 | ||
65 | _pure_ static const char *swap_sub_state_to_string(Unit *u) { | |
66 | assert(u); | |
67 | ||
68 | return swap_state_to_string(SWAP(u)->state); | |
69 | } | |
70 | ||
71 | _pure_ static bool swap_may_gc(Unit *u) { | |
72 | Swap *s = SWAP(u); | |
73 | ||
74 | assert(s); | |
75 | ||
76 | if (s->from_proc_swaps) | |
77 | return false; | |
78 | ||
79 | return true; | |
80 | } | |
81 | ||
82 | _pure_ static bool swap_is_extrinsic(Unit *u) { | |
83 | assert(SWAP(u)); | |
84 | ||
85 | return MANAGER_IS_USER(u->manager); | |
86 | } | |
87 | ||
e04aad61 | 88 | static 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 | ||
98 | static 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 | 137 | static void swap_init(Unit *u) { |
6e620bec LP |
138 | Swap *s = SWAP(u); |
139 | ||
140 | assert(s); | |
1124fe6f | 141 | assert(UNIT(s)->load_state == UNIT_STUB); |
6e620bec | 142 | |
1f19a534 | 143 | s->timeout_usec = u->manager->default_timeout_start_usec; |
e04aad61 | 144 | |
ac155bb8 MS |
145 | s->exec_context.std_output = u->manager->default_std_output; |
146 | s->exec_context.std_error = u->manager->default_std_error; | |
085afe36 | 147 | |
e1770af8 | 148 | s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; |
c8f4d764 | 149 | |
5bcb0f2b | 150 | u->ignore_on_isolate = true; |
e04aad61 LP |
151 | } |
152 | ||
153 | static void swap_unwatch_control_pid(Swap *s) { | |
154 | assert(s); | |
155 | ||
156 | if (s->control_pid <= 0) | |
157 | return; | |
158 | ||
159 | unit_unwatch_pid(UNIT(s), s->control_pid); | |
160 | s->control_pid = 0; | |
6e620bec LP |
161 | } |
162 | ||
4e85aff4 LP |
163 | static void swap_done(Unit *u) { |
164 | Swap *s = SWAP(u); | |
07b0b134 | 165 | |
4e85aff4 | 166 | assert(s); |
07b0b134 | 167 | |
e04aad61 | 168 | swap_unset_proc_swaps(s); |
9670d583 | 169 | swap_set_devnode(s, NULL); |
e04aad61 | 170 | |
a1e58e8e LP |
171 | s->what = mfree(s->what); |
172 | s->parameters_fragment.what = mfree(s->parameters_fragment.what); | |
173 | s->parameters_fragment.options = mfree(s->parameters_fragment.options); | |
86b23b07 | 174 | |
e8a565cb | 175 | s->exec_runtime = exec_runtime_unref(s->exec_runtime, false); |
e04aad61 LP |
176 | exec_command_done_array(s->exec_command, _SWAP_EXEC_COMMAND_MAX); |
177 | s->control_command = NULL; | |
178 | ||
29206d46 LP |
179 | dynamic_creds_unref(&s->dynamic_creds); |
180 | ||
e04aad61 LP |
181 | swap_unwatch_control_pid(s); |
182 | ||
718db961 LP |
183 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
184 | } | |
185 | ||
36c16a7c | 186 | static int swap_arm_timer(Swap *s, usec_t usec) { |
718db961 LP |
187 | int r; |
188 | ||
189 | assert(s); | |
190 | ||
718db961 | 191 | if (s->timer_event_source) { |
36c16a7c | 192 | r = sd_event_source_set_time(s->timer_event_source, usec); |
718db961 LP |
193 | if (r < 0) |
194 | return r; | |
195 | ||
196 | return sd_event_source_set_enabled(s->timer_event_source, SD_EVENT_ONESHOT); | |
197 | } | |
198 | ||
36c16a7c LP |
199 | if (usec == USEC_INFINITY) |
200 | return 0; | |
201 | ||
7dfbe2e3 | 202 | r = sd_event_add_time( |
6a0f1f6d LP |
203 | UNIT(s)->manager->event, |
204 | &s->timer_event_source, | |
205 | CLOCK_MONOTONIC, | |
36c16a7c | 206 | usec, 0, |
6a0f1f6d | 207 | swap_dispatch_timer, s); |
7dfbe2e3 TG |
208 | if (r < 0) |
209 | return r; | |
210 | ||
211 | (void) sd_event_source_set_description(s->timer_event_source, "swap-timer"); | |
212 | ||
213 | return 0; | |
07b0b134 ML |
214 | } |
215 | ||
61f9cf4e LP |
216 | static SwapParameters* swap_get_parameters(Swap *s) { |
217 | assert(s); | |
218 | ||
219 | if (s->from_proc_swaps) | |
220 | return &s->parameters_proc_swaps; | |
221 | ||
222 | if (s->from_fragment) | |
223 | return &s->parameters_fragment; | |
224 | ||
225 | return NULL; | |
226 | } | |
227 | ||
eef85c4a | 228 | static int swap_add_device_dependencies(Swap *s) { |
61f9cf4e LP |
229 | UnitDependencyMask mask; |
230 | SwapParameters *p; | |
44b0d1fd | 231 | int r; |
61f9cf4e | 232 | |
173a8d04 LP |
233 | assert(s); |
234 | ||
235 | if (!s->what) | |
236 | return 0; | |
237 | ||
61f9cf4e | 238 | p = swap_get_parameters(s); |
d4a3494e | 239 | if (!p || !p->what) |
f10af76d LP |
240 | return 0; |
241 | ||
61f9cf4e LP |
242 | mask = s->from_proc_swaps ? UNIT_DEPENDENCY_PROC_SWAP : UNIT_DEPENDENCY_FILE; |
243 | ||
44b0d1fd LP |
244 | if (is_device_path(p->what)) { |
245 | r = unit_add_node_dependency(UNIT(s), p->what, UNIT_REQUIRES, mask); | |
246 | if (r < 0) | |
247 | return r; | |
248 | ||
249 | return unit_add_blockdev_dependency(UNIT(s), p->what, mask); | |
250 | } | |
9b88bb50 | 251 | |
61f9cf4e LP |
252 | /* File based swap devices need to be ordered after systemd-remount-fs.service, since they might need |
253 | * a writable file system. */ | |
254 | return unit_add_dependency_by_name(UNIT(s), UNIT_AFTER, SPECIAL_REMOUNT_FS_SERVICE, true, mask); | |
173a8d04 LP |
255 | } |
256 | ||
2edd4434 | 257 | static int swap_add_default_dependencies(Swap *s) { |
8bf23dc7 FB |
258 | int r; |
259 | ||
2edd4434 LP |
260 | assert(s); |
261 | ||
4c9ea260 LP |
262 | if (!UNIT(s)->default_dependencies) |
263 | return 0; | |
264 | ||
463d0d15 | 265 | if (!MANAGER_IS_SYSTEM(UNIT(s)->manager)) |
6b1dc2bd | 266 | return 0; |
2edd4434 | 267 | |
75f86906 | 268 | if (detect_container() > 0) |
c0387ebf LP |
269 | return 0; |
270 | ||
8bf23dc7 FB |
271 | /* swap units generated for the swap dev links are missing the |
272 | * ordering dep against the swap target. */ | |
35d8c19a | 273 | r = unit_add_dependency_by_name(UNIT(s), UNIT_BEFORE, SPECIAL_SWAP_TARGET, true, UNIT_DEPENDENCY_DEFAULT); |
8bf23dc7 FB |
274 | if (r < 0) |
275 | return r; | |
276 | ||
5a724170 | 277 | return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, true, UNIT_DEPENDENCY_DEFAULT); |
2edd4434 LP |
278 | } |
279 | ||
4e85aff4 | 280 | static int swap_verify(Swap *s) { |
7fd1b19b | 281 | _cleanup_free_ char *e = NULL; |
7410616c | 282 | int r; |
4e85aff4 | 283 | |
75193d41 | 284 | assert(UNIT(s)->load_state == UNIT_LOADED); |
4e85aff4 | 285 | |
7410616c LP |
286 | r = unit_name_from_path(s->what, ".swap", &e); |
287 | if (r < 0) | |
f2341e0a | 288 | return log_unit_error_errno(UNIT(s), r, "Failed to generate unit name from path: %m"); |
4e85aff4 | 289 | |
7410616c | 290 | if (!unit_has_name(UNIT(s), e)) { |
f2341e0a | 291 | log_unit_error(UNIT(s), "Value of What= and unit name do not match, not loading."); |
6f40aa45 | 292 | return -ENOEXEC; |
4e85aff4 LP |
293 | } |
294 | ||
4819ff03 | 295 | if (s->exec_context.pam_name && s->kill_context.kill_mode != KILL_CONTROL_GROUP) { |
f2341e0a | 296 | log_unit_error(UNIT(s), "Unit has PAM enabled. Kill mode must be set to 'control-group'. Refusing to load."); |
6f40aa45 | 297 | return -ENOEXEC; |
e04aad61 LP |
298 | } |
299 | ||
4e85aff4 LP |
300 | return 0; |
301 | } | |
302 | ||
9670d583 | 303 | static int swap_load_devnode(Swap *s) { |
4366e598 | 304 | _cleanup_(sd_device_unrefp) sd_device *d = NULL; |
9670d583 LP |
305 | struct stat st; |
306 | const char *p; | |
e5ca27b7 | 307 | int r; |
9670d583 LP |
308 | |
309 | assert(s); | |
310 | ||
311 | if (stat(s->what, &st) < 0 || !S_ISBLK(st.st_mode)) | |
312 | return 0; | |
313 | ||
4366e598 | 314 | r = device_new_from_stat_rdev(&d, &st); |
e5ca27b7 | 315 | if (r < 0) { |
8ed6f81b YW |
316 | log_unit_full_errno(UNIT(s), r == -ENOENT ? LOG_DEBUG : LOG_WARNING, r, |
317 | "Failed to allocate device for swap %s: %m", s->what); | |
9670d583 | 318 | return 0; |
e5ca27b7 | 319 | } |
9670d583 | 320 | |
4366e598 | 321 | if (sd_device_get_devname(d, &p) < 0) |
9670d583 LP |
322 | return 0; |
323 | ||
324 | return swap_set_devnode(s, p); | |
325 | } | |
326 | ||
15332d73 | 327 | static int swap_add_extras(Swap *s) { |
07b0b134 | 328 | int r; |
07b0b134 ML |
329 | |
330 | assert(s); | |
07b0b134 | 331 | |
15332d73 LP |
332 | if (UNIT(s)->fragment_path) |
333 | s->from_fragment = true; | |
07b0b134 | 334 | |
15332d73 LP |
335 | if (!s->what) { |
336 | if (s->parameters_fragment.what) | |
337 | s->what = strdup(s->parameters_fragment.what); | |
338 | else if (s->parameters_proc_swaps.what) | |
339 | s->what = strdup(s->parameters_proc_swaps.what); | |
340 | else { | |
341 | r = unit_name_to_path(UNIT(s)->id, &s->what); | |
5bcb0f2b | 342 | if (r < 0) |
4e85aff4 | 343 | return r; |
5bcb0f2b | 344 | } |
4e85aff4 | 345 | |
15332d73 LP |
346 | if (!s->what) |
347 | return -ENOMEM; | |
348 | } | |
07b0b134 | 349 | |
15332d73 | 350 | path_simplify(s->what, false); |
07b0b134 | 351 | |
15332d73 LP |
352 | if (!UNIT(s)->description) { |
353 | r = unit_set_description(UNIT(s), s->what); | |
9670d583 LP |
354 | if (r < 0) |
355 | return r; | |
15332d73 | 356 | } |
9670d583 | 357 | |
15332d73 LP |
358 | r = unit_require_mounts_for(UNIT(s), s->what, UNIT_DEPENDENCY_IMPLICIT); |
359 | if (r < 0) | |
360 | return r; | |
598459ce | 361 | |
15332d73 LP |
362 | r = swap_add_device_dependencies(s); |
363 | if (r < 0) | |
364 | return r; | |
598459ce | 365 | |
15332d73 LP |
366 | r = swap_load_devnode(s); |
367 | if (r < 0) | |
368 | return r; | |
a016b922 | 369 | |
15332d73 LP |
370 | r = unit_patch_contexts(UNIT(s)); |
371 | if (r < 0) | |
372 | return r; | |
373 | ||
374 | r = unit_add_exec_dependencies(UNIT(s), &s->exec_context); | |
375 | if (r < 0) | |
376 | return r; | |
377 | ||
378 | r = unit_set_default_slice(UNIT(s)); | |
379 | if (r < 0) | |
380 | return r; | |
381 | ||
382 | r = swap_add_default_dependencies(s); | |
383 | if (r < 0) | |
384 | return r; | |
385 | ||
386 | return 0; | |
387 | } | |
388 | ||
389 | static int swap_load(Unit *u) { | |
390 | Swap *s = SWAP(u); | |
75193d41 | 391 | int r, q = 0; |
15332d73 LP |
392 | |
393 | assert(s); | |
394 | assert(u->load_state == UNIT_STUB); | |
395 | ||
396 | /* Load a .swap file */ | |
c3620770 ZJS |
397 | bool fragment_optional = s->from_proc_swaps; |
398 | r = unit_load_fragment_and_dropin(u, !fragment_optional); | |
15332d73 | 399 | |
75193d41 ZJS |
400 | /* Add in some extras, and do so either when we successfully loaded something or when /proc/swaps is |
401 | * already active. */ | |
06721f39 LP |
402 | if (u->load_state == UNIT_LOADED || s->from_proc_swaps) |
403 | q = swap_add_extras(s); | |
15332d73 | 404 | |
06721f39 LP |
405 | if (r < 0) |
406 | return r; | |
407 | if (q < 0) | |
408 | return q; | |
75193d41 ZJS |
409 | if (u->load_state != UNIT_LOADED) |
410 | return 0; | |
07b0b134 ML |
411 | |
412 | return swap_verify(s); | |
413 | } | |
414 | ||
628c89cc | 415 | static int swap_setup_unit( |
4e85aff4 LP |
416 | Manager *m, |
417 | const char *what, | |
e04aad61 | 418 | const char *what_proc_swaps, |
4e85aff4 | 419 | int priority, |
e04aad61 LP |
420 | bool set_flags) { |
421 | ||
7fd1b19b | 422 | _cleanup_free_ char *e = NULL; |
2c7c6144 | 423 | bool delete = false; |
5bcb0f2b | 424 | Unit *u = NULL; |
07b0b134 | 425 | int r; |
4e85aff4 LP |
426 | SwapParameters *p; |
427 | ||
428 | assert(m); | |
429 | assert(what); | |
6b1dc2bd | 430 | assert(what_proc_swaps); |
07b0b134 | 431 | |
7410616c LP |
432 | r = unit_name_from_path(what, ".swap", &e); |
433 | if (r < 0) | |
f2341e0a | 434 | return log_unit_error_errno(u, r, "Failed to generate unit name from path: %m"); |
07b0b134 | 435 | |
e04aad61 | 436 | u = manager_get_unit(m, e); |
6b1dc2bd | 437 | if (u && |
e04aad61 | 438 | SWAP(u)->from_proc_swaps && |
baaa35ad ZJS |
439 | !path_equal(SWAP(u)->parameters_proc_swaps.what, what_proc_swaps)) |
440 | return log_error_errno(SYNTHETIC_ERRNO(EEXIST), | |
441 | "Swap %s appeared twice with different device paths %s and %s", | |
442 | e, SWAP(u)->parameters_proc_swaps.what, what_proc_swaps); | |
4e85aff4 LP |
443 | |
444 | if (!u) { | |
07b0b134 ML |
445 | delete = true; |
446 | ||
a581e45a | 447 | r = unit_new_for_name(m, sizeof(Swap), e, &u); |
7d17cfbc | 448 | if (r < 0) |
e04aad61 LP |
449 | goto fail; |
450 | ||
7d17cfbc MS |
451 | SWAP(u)->what = strdup(what); |
452 | if (!SWAP(u)->what) { | |
628c89cc | 453 | r = -ENOMEM; |
e04aad61 LP |
454 | goto fail; |
455 | } | |
456 | ||
457 | unit_add_to_load_queue(u); | |
4e85aff4 LP |
458 | } else |
459 | delete = false; | |
07b0b134 | 460 | |
6b1dc2bd | 461 | p = &SWAP(u)->parameters_proc_swaps; |
07b0b134 | 462 | |
6b1dc2bd | 463 | if (!p->what) { |
5bcb0f2b LP |
464 | p->what = strdup(what_proc_swaps); |
465 | if (!p->what) { | |
466 | r = -ENOMEM; | |
6b1dc2bd LP |
467 | goto fail; |
468 | } | |
6b1dc2bd | 469 | } |
e04aad61 | 470 | |
46f94480 LP |
471 | /* The unit is definitely around now, mark it as loaded if it was previously referenced but could not be |
472 | * loaded. After all we can load it now, from the data in /proc/swaps. */ | |
473 | if (IN_SET(u->load_state, UNIT_NOT_FOUND, UNIT_BAD_SETTING, UNIT_ERROR)) { | |
474 | u->load_state = UNIT_LOADED; | |
475 | u->load_error = 0; | |
476 | } | |
477 | ||
6b1dc2bd LP |
478 | if (set_flags) { |
479 | SWAP(u)->is_active = true; | |
480 | SWAP(u)->just_activated = !SWAP(u)->from_proc_swaps; | |
4e85aff4 | 481 | } |
07b0b134 | 482 | |
6b1dc2bd LP |
483 | SWAP(u)->from_proc_swaps = true; |
484 | ||
4e85aff4 | 485 | p->priority = priority; |
7477451b | 486 | p->priority_set = true; |
07b0b134 | 487 | |
4e85aff4 | 488 | unit_add_to_dbus_queue(u); |
07b0b134 ML |
489 | return 0; |
490 | ||
491 | fail: | |
f2341e0a | 492 | log_unit_warning_errno(u, r, "Failed to load swap unit: %m"); |
e04aad61 | 493 | |
c9d5c9c0 | 494 | if (delete) |
07b0b134 ML |
495 | unit_free(u); |
496 | ||
4e85aff4 | 497 | return r; |
07b0b134 ML |
498 | } |
499 | ||
628c89cc | 500 | static int swap_process_new(Manager *m, const char *device, int prio, bool set_flags) { |
4366e598 YW |
501 | _cleanup_(sd_device_unrefp) sd_device *d = NULL; |
502 | const char *dn, *devlink; | |
503 | struct stat st, st_link; | |
5bcb0f2b | 504 | int r; |
e04aad61 LP |
505 | |
506 | assert(m); | |
507 | ||
628c89cc | 508 | r = swap_setup_unit(m, device, device, prio, set_flags); |
5bcb0f2b LP |
509 | if (r < 0) |
510 | return r; | |
e04aad61 | 511 | |
5bcb0f2b LP |
512 | /* If this is a block device, then let's add duplicates for |
513 | * all other names of this block device */ | |
514 | if (stat(device, &st) < 0 || !S_ISBLK(st.st_mode)) | |
515 | return 0; | |
e04aad61 | 516 | |
4366e598 | 517 | r = device_new_from_stat_rdev(&d, &st); |
e5ca27b7 LP |
518 | if (r < 0) { |
519 | log_full_errno(r == -ENOENT ? LOG_DEBUG : LOG_WARNING, r, | |
4366e598 | 520 | "Failed to allocate device for swap %s: %m", device); |
5bcb0f2b | 521 | return 0; |
e5ca27b7 | 522 | } |
e04aad61 | 523 | |
5bcb0f2b | 524 | /* Add the main device node */ |
4366e598 | 525 | if (sd_device_get_devname(d, &dn) >= 0 && !streq(dn, device)) |
628c89cc | 526 | swap_setup_unit(m, dn, device, prio, set_flags); |
e04aad61 | 527 | |
5bcb0f2b | 528 | /* Add additional units for all symlinks */ |
4366e598 | 529 | FOREACH_DEVICE_DEVLINK(d, devlink) { |
e04aad61 | 530 | |
5bcb0f2b | 531 | /* Don't bother with the /dev/block links */ |
4366e598 | 532 | if (streq(devlink, device)) |
5bcb0f2b | 533 | continue; |
e04aad61 | 534 | |
4366e598 | 535 | if (path_startswith(devlink, "/dev/block/")) |
5bcb0f2b | 536 | continue; |
e04aad61 | 537 | |
4366e598 YW |
538 | if (stat(devlink, &st_link) >= 0 && |
539 | (!S_ISBLK(st_link.st_mode) || | |
540 | st_link.st_rdev != st.st_rdev)) | |
541 | continue; | |
e04aad61 | 542 | |
4366e598 | 543 | swap_setup_unit(m, devlink, device, prio, set_flags); |
e04aad61 LP |
544 | } |
545 | ||
a0a42408 | 546 | return 0; |
e04aad61 LP |
547 | } |
548 | ||
07b0b134 ML |
549 | static void swap_set_state(Swap *s, SwapState state) { |
550 | SwapState old_state; | |
37cf8fee | 551 | Swap *other; |
e04aad61 | 552 | |
07b0b134 ML |
553 | assert(s); |
554 | ||
6fcbec6f LP |
555 | if (s->state != state) |
556 | bus_unit_send_pending_change_signal(UNIT(s), false); | |
557 | ||
07b0b134 ML |
558 | old_state = s->state; |
559 | s->state = state; | |
560 | ||
dedf3719 | 561 | if (!SWAP_STATE_WITH_PROCESS(state)) { |
718db961 | 562 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
e04aad61 LP |
563 | swap_unwatch_control_pid(s); |
564 | s->control_command = NULL; | |
565 | s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; | |
566 | } | |
567 | ||
07b0b134 | 568 | if (state != old_state) |
f2341e0a | 569 | log_unit_debug(UNIT(s), "Changed %s -> %s", swap_state_to_string(old_state), swap_state_to_string(state)); |
07b0b134 | 570 | |
2ad2e41a | 571 | unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], 0); |
37cf8fee LP |
572 | |
573 | /* If there other units for the same device node have a job | |
574 | queued it might be worth checking again if it is runnable | |
575 | now. This is necessary, since swap_start() refuses | |
576 | operation with EAGAIN if there's already another job for | |
577 | the same device node queued. */ | |
578 | LIST_FOREACH_OTHERS(same_devnode, other, s) | |
579 | if (UNIT(other)->job) | |
580 | job_add_to_run_queue(UNIT(other)->job); | |
07b0b134 ML |
581 | } |
582 | ||
be847e82 | 583 | static int swap_coldplug(Unit *u) { |
07b0b134 ML |
584 | Swap *s = SWAP(u); |
585 | SwapState new_state = SWAP_DEAD; | |
e04aad61 | 586 | int r; |
07b0b134 ML |
587 | |
588 | assert(s); | |
589 | assert(s->state == SWAP_DEAD); | |
590 | ||
591 | if (s->deserialized_state != s->state) | |
592 | new_state = s->deserialized_state; | |
4e85aff4 | 593 | else if (s->from_proc_swaps) |
07b0b134 ML |
594 | new_state = SWAP_ACTIVE; |
595 | ||
5bcb0f2b LP |
596 | if (new_state == s->state) |
597 | return 0; | |
e04aad61 | 598 | |
c386f588 LP |
599 | if (s->control_pid > 0 && |
600 | pid_is_unwaited(s->control_pid) && | |
dedf3719 | 601 | SWAP_STATE_WITH_PROCESS(new_state)) { |
e04aad61 | 602 | |
f75f613d | 603 | r = unit_watch_pid(UNIT(s), s->control_pid, false); |
5bcb0f2b LP |
604 | if (r < 0) |
605 | return r; | |
e04aad61 | 606 | |
36c16a7c | 607 | r = swap_arm_timer(s, usec_add(u->state_change_timestamp.monotonic, s->timeout_usec)); |
5bcb0f2b LP |
608 | if (r < 0) |
609 | return r; | |
e04aad61 | 610 | } |
07b0b134 | 611 | |
e8a565cb | 612 | if (!IN_SET(new_state, SWAP_DEAD, SWAP_FAILED)) { |
29206d46 | 613 | (void) unit_setup_dynamic_creds(u); |
e8a565cb YW |
614 | (void) unit_setup_exec_runtime(u); |
615 | } | |
29206d46 | 616 | |
5bcb0f2b | 617 | swap_set_state(s, new_state); |
07b0b134 ML |
618 | return 0; |
619 | } | |
620 | ||
621 | static void swap_dump(Unit *u, FILE *f, const char *prefix) { | |
f2e18ef1 | 622 | char buf[FORMAT_TIMESPAN_MAX]; |
07b0b134 | 623 | Swap *s = SWAP(u); |
4e85aff4 | 624 | SwapParameters *p; |
07b0b134 ML |
625 | |
626 | assert(s); | |
4e85aff4 LP |
627 | assert(f); |
628 | ||
629 | if (s->from_proc_swaps) | |
630 | p = &s->parameters_proc_swaps; | |
631 | else if (s->from_fragment) | |
632 | p = &s->parameters_fragment; | |
b6bfc7bb LP |
633 | else |
634 | p = NULL; | |
07b0b134 ML |
635 | |
636 | fprintf(f, | |
4e85aff4 | 637 | "%sSwap State: %s\n" |
e1770af8 | 638 | "%sResult: %s\n" |
a8b689b7 | 639 | "%sClean Result: %s\n" |
07b0b134 | 640 | "%sWhat: %s\n" |
4e85aff4 | 641 | "%sFrom /proc/swaps: %s\n" |
39c79477 ZJS |
642 | "%sFrom fragment: %s\n" |
643 | "%sExtrinsic: %s\n", | |
07b0b134 | 644 | prefix, swap_state_to_string(s->state), |
e1770af8 | 645 | prefix, swap_result_to_string(s->result), |
a8b689b7 | 646 | prefix, swap_result_to_string(s->clean_result), |
07b0b134 | 647 | prefix, s->what, |
4e85aff4 | 648 | prefix, yes_no(s->from_proc_swaps), |
39c79477 ZJS |
649 | prefix, yes_no(s->from_fragment), |
650 | prefix, yes_no(swap_is_extrinsic(u))); | |
e04aad61 | 651 | |
9670d583 LP |
652 | if (s->devnode) |
653 | fprintf(f, "%sDevice Node: %s\n", prefix, s->devnode); | |
654 | ||
b6bfc7bb LP |
655 | if (p) |
656 | fprintf(f, | |
657 | "%sPriority: %i\n" | |
47cb901e | 658 | "%sOptions: %s\n", |
b6bfc7bb | 659 | prefix, p->priority, |
47cb901e | 660 | prefix, strempty(p->options)); |
b6bfc7bb | 661 | |
9bd0e1b8 YW |
662 | fprintf(f, |
663 | "%sTimeoutSec: %s\n", | |
664 | prefix, format_timespan(buf, sizeof(buf), s->timeout_usec, USEC_PER_SEC)); | |
665 | ||
e04aad61 LP |
666 | if (s->control_pid > 0) |
667 | fprintf(f, | |
de0671ee ZJS |
668 | "%sControl PID: "PID_FMT"\n", |
669 | prefix, s->control_pid); | |
e04aad61 LP |
670 | |
671 | exec_context_dump(&s->exec_context, f, prefix); | |
4819ff03 | 672 | kill_context_dump(&s->kill_context, f, prefix); |
bc0623df | 673 | cgroup_context_dump(UNIT(s), f, prefix); |
e04aad61 LP |
674 | } |
675 | ||
676 | static int swap_spawn(Swap *s, ExecCommand *c, pid_t *_pid) { | |
3c7416b6 | 677 | |
b9c04eaf | 678 | _cleanup_(exec_params_clear) ExecParameters exec_params = { |
1703fa41 | 679 | .flags = EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN, |
c39f1ce2 LP |
680 | .stdin_fd = -1, |
681 | .stdout_fd = -1, | |
682 | .stderr_fd = -1, | |
5686391b | 683 | .exec_fd = -1, |
9fa95f85 | 684 | }; |
3c7416b6 LP |
685 | pid_t pid; |
686 | int r; | |
e04aad61 LP |
687 | |
688 | assert(s); | |
689 | assert(c); | |
690 | assert(_pid); | |
691 | ||
3c7416b6 | 692 | r = unit_prepare_exec(UNIT(s)); |
29206d46 | 693 | if (r < 0) |
3c7416b6 | 694 | return r; |
29206d46 | 695 | |
36c16a7c | 696 | r = swap_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec)); |
646134dc | 697 | if (r < 0) |
e04aad61 LP |
698 | goto fail; |
699 | ||
1ad6e8b3 LP |
700 | r = unit_set_exec_params(UNIT(s), &exec_params); |
701 | if (r < 0) | |
702 | goto fail; | |
9fa95f85 | 703 | |
f2341e0a LP |
704 | r = exec_spawn(UNIT(s), |
705 | c, | |
646134dc | 706 | &s->exec_context, |
9fa95f85 | 707 | &exec_params, |
613b411c | 708 | s->exec_runtime, |
29206d46 | 709 | &s->dynamic_creds, |
646134dc ZJS |
710 | &pid); |
711 | if (r < 0) | |
e04aad61 LP |
712 | goto fail; |
713 | ||
f75f613d | 714 | r = unit_watch_pid(UNIT(s), pid, true); |
646134dc | 715 | if (r < 0) |
e04aad61 LP |
716 | goto fail; |
717 | ||
718 | *_pid = pid; | |
719 | ||
720 | return 0; | |
721 | ||
722 | fail: | |
718db961 | 723 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
3536f49e | 724 | |
e04aad61 | 725 | return r; |
07b0b134 ML |
726 | } |
727 | ||
e1770af8 | 728 | static void swap_enter_dead(Swap *s, SwapResult f) { |
07b0b134 ML |
729 | assert(s); |
730 | ||
a0fef983 | 731 | if (s->result == SWAP_SUCCESS) |
e1770af8 | 732 | s->result = f; |
e04aad61 | 733 | |
aac99f30 | 734 | unit_log_result(UNIT(s), s->result == SWAP_SUCCESS, swap_result_to_string(s->result)); |
4c425434 | 735 | unit_warn_leftover_processes(UNIT(s), unit_log_leftover_process_stop); |
29206d46 LP |
736 | swap_set_state(s, s->result != SWAP_SUCCESS ? SWAP_FAILED : SWAP_DEAD); |
737 | ||
e8a565cb | 738 | s->exec_runtime = exec_runtime_unref(s->exec_runtime, true); |
613b411c | 739 | |
bb0c0d6f | 740 | unit_destroy_runtime_data(UNIT(s), &s->exec_context); |
e66cf1a3 | 741 | |
00d9ef85 LP |
742 | unit_unref_uid_gid(UNIT(s), true); |
743 | ||
29206d46 | 744 | dynamic_creds_destroy(&s->dynamic_creds); |
07b0b134 ML |
745 | } |
746 | ||
e1770af8 | 747 | static void swap_enter_active(Swap *s, SwapResult f) { |
e04aad61 LP |
748 | assert(s); |
749 | ||
a0fef983 | 750 | if (s->result == SWAP_SUCCESS) |
e1770af8 | 751 | s->result = f; |
e04aad61 LP |
752 | |
753 | swap_set_state(s, SWAP_ACTIVE); | |
754 | } | |
755 | ||
50864457 LP |
756 | static void swap_enter_dead_or_active(Swap *s, SwapResult f) { |
757 | assert(s); | |
758 | ||
9c1f969d HD |
759 | if (s->from_proc_swaps) { |
760 | Swap *other; | |
761 | ||
50864457 | 762 | swap_enter_active(s, f); |
9c1f969d HD |
763 | |
764 | LIST_FOREACH_OTHERS(same_devnode, other, s) | |
765 | if (UNIT(other)->job) | |
766 | swap_enter_dead_or_active(other, f); | |
767 | } else | |
50864457 LP |
768 | swap_enter_dead(s, f); |
769 | } | |
770 | ||
a232ebcc ZJS |
771 | static int state_to_kill_operation(Swap *s, SwapState state) { |
772 | if (state == SWAP_DEACTIVATING_SIGTERM) { | |
773 | if (unit_has_job_type(UNIT(s), JOB_RESTART)) | |
774 | return KILL_RESTART; | |
775 | else | |
776 | return KILL_TERMINATE; | |
777 | } | |
778 | ||
779 | return KILL_KILL; | |
780 | } | |
781 | ||
e1770af8 | 782 | static void swap_enter_signal(Swap *s, SwapState state, SwapResult f) { |
07b0b134 ML |
783 | int r; |
784 | ||
785 | assert(s); | |
e04aad61 | 786 | |
a0fef983 | 787 | if (s->result == SWAP_SUCCESS) |
e1770af8 | 788 | s->result = f; |
e04aad61 | 789 | |
a232ebcc ZJS |
790 | r = unit_kill_context(UNIT(s), |
791 | &s->kill_context, | |
792 | state_to_kill_operation(s, state), | |
793 | -1, | |
794 | s->control_pid, | |
795 | false); | |
cd2086fe LP |
796 | if (r < 0) |
797 | goto fail; | |
e04aad61 | 798 | |
cd2086fe | 799 | if (r > 0) { |
36c16a7c | 800 | r = swap_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_usec)); |
646134dc | 801 | if (r < 0) |
e04aad61 LP |
802 | goto fail; |
803 | ||
804 | swap_set_state(s, state); | |
50864457 | 805 | } else if (state == SWAP_DEACTIVATING_SIGTERM && s->kill_context.send_sigkill) |
ac84d1fb LP |
806 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, SWAP_SUCCESS); |
807 | else | |
50864457 | 808 | swap_enter_dead_or_active(s, SWAP_SUCCESS); |
e04aad61 LP |
809 | |
810 | return; | |
811 | ||
812 | fail: | |
f2341e0a | 813 | log_unit_warning_errno(UNIT(s), r, "Failed to kill processes: %m"); |
50864457 | 814 | swap_enter_dead_or_active(s, SWAP_FAILURE_RESOURCES); |
e04aad61 LP |
815 | } |
816 | ||
817 | static void swap_enter_activating(Swap *s) { | |
bf1d7ba7 KZ |
818 | _cleanup_free_ char *opts = NULL; |
819 | int r; | |
e04aad61 LP |
820 | |
821 | assert(s); | |
822 | ||
4c425434 | 823 | unit_warn_leftover_processes(UNIT(s), unit_log_leftover_process_start); |
a4634b21 | 824 | |
e04aad61 LP |
825 | s->control_command_id = SWAP_EXEC_ACTIVATE; |
826 | s->control_command = s->exec_command + SWAP_EXEC_ACTIVATE; | |
07b0b134 | 827 | |
86b23b07 | 828 | if (s->from_fragment) { |
7477451b | 829 | int priority = 0; |
47cb901e | 830 | |
bf1d7ba7 KZ |
831 | r = fstab_find_pri(s->parameters_fragment.options, &priority); |
832 | if (r < 0) | |
af4454cb LP |
833 | log_unit_warning_errno(UNIT(s), r, "Failed to parse swap priority \"%s\", ignoring: %m", s->parameters_fragment.options); |
834 | else if (r > 0 && s->parameters_fragment.priority_set) | |
835 | log_unit_warning(UNIT(s), "Duplicate swap priority configuration by Priority= and Options= fields."); | |
bf1d7ba7 | 836 | |
7477451b | 837 | if (r <= 0 && s->parameters_fragment.priority_set) { |
bf1d7ba7 KZ |
838 | if (s->parameters_fragment.options) |
839 | r = asprintf(&opts, "%s,pri=%i", s->parameters_fragment.options, s->parameters_fragment.priority); | |
840 | else | |
841 | r = asprintf(&opts, "pri=%i", s->parameters_fragment.priority); | |
6fca66a7 LP |
842 | if (r < 0) { |
843 | r = -ENOMEM; | |
bf1d7ba7 | 844 | goto fail; |
6fca66a7 | 845 | } |
e64d5235 | 846 | } |
86b23b07 JS |
847 | } |
848 | ||
849 | r = exec_command_set(s->control_command, "/sbin/swapon", NULL); | |
850 | if (r < 0) | |
851 | goto fail; | |
4e85aff4 | 852 | |
bf1d7ba7 KZ |
853 | if (s->parameters_fragment.options || opts) { |
854 | r = exec_command_append(s->control_command, "-o", | |
af4454cb | 855 | opts ?: s->parameters_fragment.options, NULL); |
86b23b07 JS |
856 | if (r < 0) |
857 | goto fail; | |
858 | } | |
e04aad61 | 859 | |
86b23b07 | 860 | r = exec_command_append(s->control_command, s->what, NULL); |
e04aad61 LP |
861 | if (r < 0) |
862 | goto fail; | |
863 | ||
864 | swap_unwatch_control_pid(s); | |
865 | ||
646134dc ZJS |
866 | r = swap_spawn(s, s->control_command, &s->control_pid); |
867 | if (r < 0) | |
e04aad61 LP |
868 | goto fail; |
869 | ||
870 | swap_set_state(s, SWAP_ACTIVATING); | |
e04aad61 LP |
871 | return; |
872 | ||
873 | fail: | |
f2341e0a | 874 | log_unit_warning_errno(UNIT(s), r, "Failed to run 'swapon' task: %m"); |
50864457 | 875 | swap_enter_dead_or_active(s, SWAP_FAILURE_RESOURCES); |
e04aad61 LP |
876 | } |
877 | ||
e1770af8 | 878 | static void swap_enter_deactivating(Swap *s) { |
e04aad61 LP |
879 | int r; |
880 | ||
881 | assert(s); | |
882 | ||
e04aad61 LP |
883 | s->control_command_id = SWAP_EXEC_DEACTIVATE; |
884 | s->control_command = s->exec_command + SWAP_EXEC_DEACTIVATE; | |
885 | ||
646134dc | 886 | r = exec_command_set(s->control_command, |
e04aad61 LP |
887 | "/sbin/swapoff", |
888 | s->what, | |
646134dc ZJS |
889 | NULL); |
890 | if (r < 0) | |
e04aad61 LP |
891 | goto fail; |
892 | ||
893 | swap_unwatch_control_pid(s); | |
894 | ||
646134dc ZJS |
895 | r = swap_spawn(s, s->control_command, &s->control_pid); |
896 | if (r < 0) | |
e04aad61 LP |
897 | goto fail; |
898 | ||
899 | swap_set_state(s, SWAP_DEACTIVATING); | |
900 | ||
901 | return; | |
902 | ||
903 | fail: | |
f2341e0a | 904 | log_unit_warning_errno(UNIT(s), r, "Failed to run 'swapoff' task: %m"); |
50864457 | 905 | swap_enter_dead_or_active(s, SWAP_FAILURE_RESOURCES); |
e04aad61 LP |
906 | } |
907 | ||
31135818 LP |
908 | static void swap_cycle_clear(Swap *s) { |
909 | assert(s); | |
910 | ||
911 | s->result = SWAP_SUCCESS; | |
912 | exec_command_reset_status_array(s->exec_command, _SWAP_EXEC_COMMAND_MAX); | |
913 | UNIT(s)->reset_accounting = true; | |
914 | } | |
915 | ||
e04aad61 | 916 | static int swap_start(Unit *u) { |
37cf8fee | 917 | Swap *s = SWAP(u), *other; |
07299350 | 918 | int r; |
e04aad61 LP |
919 | |
920 | assert(s); | |
921 | ||
50864457 | 922 | /* We cannot fulfill this request right now, try again later please! */ |
d31ae548 FB |
923 | if (IN_SET(s->state, |
924 | SWAP_DEACTIVATING, | |
925 | SWAP_DEACTIVATING_SIGTERM, | |
a8b689b7 YW |
926 | SWAP_DEACTIVATING_SIGKILL, |
927 | SWAP_CLEANING)) | |
e04aad61 LP |
928 | return -EAGAIN; |
929 | ||
50864457 | 930 | /* Already on it! */ |
e04aad61 LP |
931 | if (s->state == SWAP_ACTIVATING) |
932 | return 0; | |
933 | ||
d31ae548 | 934 | assert(IN_SET(s->state, SWAP_DEAD, SWAP_FAILED)); |
e04aad61 | 935 | |
75f86906 | 936 | if (detect_container() > 0) |
a5c3034f LP |
937 | return -EPERM; |
938 | ||
37cf8fee LP |
939 | /* If there's a job for another swap unit for the same node |
940 | * running, then let's not dispatch this one for now, and wait | |
941 | * until that other job has finished. */ | |
942 | LIST_FOREACH_OTHERS(same_devnode, other, s) | |
943 | if (UNIT(other)->job && UNIT(other)->job->state == JOB_RUNNING) | |
944 | return -EAGAIN; | |
945 | ||
97a3f4ee | 946 | r = unit_test_start_limit(u); |
07299350 LP |
947 | if (r < 0) { |
948 | swap_enter_dead(s, SWAP_FAILURE_START_LIMIT_HIT); | |
949 | return r; | |
950 | } | |
951 | ||
4b58153d LP |
952 | r = unit_acquire_invocation_id(u); |
953 | if (r < 0) | |
954 | return r; | |
955 | ||
31135818 | 956 | swap_cycle_clear(s); |
e04aad61 | 957 | swap_enter_activating(s); |
82a2b6bb | 958 | return 1; |
07b0b134 ML |
959 | } |
960 | ||
961 | static int swap_stop(Unit *u) { | |
962 | Swap *s = SWAP(u); | |
07b0b134 ML |
963 | |
964 | assert(s); | |
965 | ||
50864457 LP |
966 | switch (s->state) { |
967 | ||
968 | case SWAP_DEACTIVATING: | |
969 | case SWAP_DEACTIVATING_SIGTERM: | |
970 | case SWAP_DEACTIVATING_SIGKILL: | |
971 | /* Already on it */ | |
e04aad61 | 972 | return 0; |
07b0b134 | 973 | |
50864457 LP |
974 | case SWAP_ACTIVATING: |
975 | case SWAP_ACTIVATING_DONE: | |
976 | /* There's a control process pending, directly enter kill mode */ | |
977 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGTERM, SWAP_SUCCESS); | |
978 | return 0; | |
07b0b134 | 979 | |
50864457 LP |
980 | case SWAP_ACTIVE: |
981 | if (detect_container() > 0) | |
982 | return -EPERM; | |
a5c3034f | 983 | |
50864457 LP |
984 | swap_enter_deactivating(s); |
985 | return 1; | |
986 | ||
a8b689b7 YW |
987 | case SWAP_CLEANING: |
988 | /* If we are currently cleaning, then abort it, brutally. */ | |
989 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, SWAP_SUCCESS); | |
990 | return 0; | |
991 | ||
50864457 LP |
992 | default: |
993 | assert_not_reached("Unexpected state."); | |
994 | } | |
07b0b134 ML |
995 | } |
996 | ||
997 | static int swap_serialize(Unit *u, FILE *f, FDSet *fds) { | |
998 | Swap *s = SWAP(u); | |
999 | ||
1000 | assert(s); | |
1001 | assert(f); | |
1002 | assert(fds); | |
1003 | ||
d68c645b LP |
1004 | (void) serialize_item(f, "state", swap_state_to_string(s->state)); |
1005 | (void) serialize_item(f, "result", swap_result_to_string(s->result)); | |
e04aad61 LP |
1006 | |
1007 | if (s->control_pid > 0) | |
d68c645b | 1008 | (void) serialize_item_format(f, "control-pid", PID_FMT, s->control_pid); |
e04aad61 LP |
1009 | |
1010 | if (s->control_command_id >= 0) | |
d68c645b | 1011 | (void) serialize_item(f, "control-command", swap_exec_command_to_string(s->control_command_id)); |
07b0b134 ML |
1012 | |
1013 | return 0; | |
1014 | } | |
1015 | ||
1016 | static int swap_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
1017 | Swap *s = SWAP(u); | |
1018 | ||
1019 | assert(s); | |
1020 | assert(fds); | |
1021 | ||
1022 | if (streq(key, "state")) { | |
1023 | SwapState state; | |
1024 | ||
646134dc ZJS |
1025 | state = swap_state_from_string(value); |
1026 | if (state < 0) | |
f2341e0a | 1027 | log_unit_debug(u, "Failed to parse state value: %s", value); |
07b0b134 ML |
1028 | else |
1029 | s->deserialized_state = state; | |
e1770af8 LP |
1030 | } else if (streq(key, "result")) { |
1031 | SwapResult f; | |
1032 | ||
1033 | f = swap_result_from_string(value); | |
1034 | if (f < 0) | |
f2341e0a | 1035 | log_unit_debug(u, "Failed to parse result value: %s", value); |
e1770af8 LP |
1036 | else if (f != SWAP_SUCCESS) |
1037 | s->result = f; | |
e04aad61 LP |
1038 | } else if (streq(key, "control-pid")) { |
1039 | pid_t pid; | |
1040 | ||
1041 | if (parse_pid(value, &pid) < 0) | |
f2341e0a | 1042 | log_unit_debug(u, "Failed to parse control-pid value: %s", value); |
e04aad61 LP |
1043 | else |
1044 | s->control_pid = pid; | |
1045 | ||
1046 | } else if (streq(key, "control-command")) { | |
1047 | SwapExecCommand id; | |
1048 | ||
646134dc ZJS |
1049 | id = swap_exec_command_from_string(value); |
1050 | if (id < 0) | |
f2341e0a | 1051 | log_unit_debug(u, "Failed to parse exec-command value: %s", value); |
e04aad61 LP |
1052 | else { |
1053 | s->control_command_id = id; | |
1054 | s->control_command = s->exec_command + id; | |
1055 | } | |
07b0b134 | 1056 | } else |
f2341e0a | 1057 | log_unit_debug(u, "Unknown serialization key: %s", key); |
07b0b134 ML |
1058 | |
1059 | return 0; | |
1060 | } | |
1061 | ||
e04aad61 LP |
1062 | static void swap_sigchld_event(Unit *u, pid_t pid, int code, int status) { |
1063 | Swap *s = SWAP(u); | |
e1770af8 | 1064 | SwapResult f; |
e04aad61 LP |
1065 | |
1066 | assert(s); | |
1067 | assert(pid >= 0); | |
1068 | ||
1069 | if (pid != s->control_pid) | |
1070 | return; | |
1071 | ||
bcce581d LP |
1072 | /* Let's scan /proc/swaps before we process SIGCHLD. For the reasoning see the similar code in |
1073 | * mount.c */ | |
1074 | (void) swap_process_proc_swaps(u->manager); | |
1075 | ||
e04aad61 LP |
1076 | s->control_pid = 0; |
1077 | ||
1f0958f6 | 1078 | if (is_clean_exit(code, status, EXIT_CLEAN_COMMAND, NULL)) |
e1770af8 LP |
1079 | f = SWAP_SUCCESS; |
1080 | else if (code == CLD_EXITED) | |
1081 | f = SWAP_FAILURE_EXIT_CODE; | |
1082 | else if (code == CLD_KILLED) | |
1083 | f = SWAP_FAILURE_SIGNAL; | |
1084 | else if (code == CLD_DUMPED) | |
1085 | f = SWAP_FAILURE_CORE_DUMP; | |
1086 | else | |
1087 | assert_not_reached("Unknown code"); | |
1088 | ||
a0fef983 | 1089 | if (s->result == SWAP_SUCCESS) |
e1770af8 | 1090 | s->result = f; |
e04aad61 LP |
1091 | |
1092 | if (s->control_command) { | |
6ea832a2 | 1093 | exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status); |
e1770af8 | 1094 | |
e04aad61 LP |
1095 | s->control_command = NULL; |
1096 | s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; | |
1097 | } | |
1098 | ||
91bbd9b7 | 1099 | unit_log_process_exit( |
5cc2cd1c | 1100 | u, |
91bbd9b7 LP |
1101 | "Swap process", |
1102 | swap_exec_command_to_string(s->control_command_id), | |
5cc2cd1c | 1103 | f == SWAP_SUCCESS, |
91bbd9b7 | 1104 | code, status); |
e04aad61 LP |
1105 | |
1106 | switch (s->state) { | |
1107 | ||
1108 | case SWAP_ACTIVATING: | |
5bcb0f2b | 1109 | case SWAP_ACTIVATING_DONE: |
e04aad61 | 1110 | |
50864457 | 1111 | if (f == SWAP_SUCCESS || s->from_proc_swaps) |
e1770af8 | 1112 | swap_enter_active(s, f); |
e04aad61 | 1113 | else |
e1770af8 | 1114 | swap_enter_dead(s, f); |
e04aad61 LP |
1115 | break; |
1116 | ||
1117 | case SWAP_DEACTIVATING: | |
1118 | case SWAP_DEACTIVATING_SIGKILL: | |
1119 | case SWAP_DEACTIVATING_SIGTERM: | |
1120 | ||
50864457 | 1121 | swap_enter_dead_or_active(s, f); |
e04aad61 LP |
1122 | break; |
1123 | ||
a8b689b7 YW |
1124 | case SWAP_CLEANING: |
1125 | if (s->clean_result == SWAP_SUCCESS) | |
1126 | s->clean_result = f; | |
1127 | ||
1128 | swap_enter_dead(s, SWAP_SUCCESS); | |
1129 | break; | |
1130 | ||
e04aad61 LP |
1131 | default: |
1132 | assert_not_reached("Uh, control process died at wrong time."); | |
1133 | } | |
1134 | ||
1135 | /* Notify clients about changed exit status */ | |
1136 | unit_add_to_dbus_queue(u); | |
e04aad61 LP |
1137 | } |
1138 | ||
718db961 LP |
1139 | static int swap_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) { |
1140 | Swap *s = SWAP(userdata); | |
e04aad61 LP |
1141 | |
1142 | assert(s); | |
718db961 | 1143 | assert(s->timer_event_source == source); |
e04aad61 LP |
1144 | |
1145 | switch (s->state) { | |
1146 | ||
1147 | case SWAP_ACTIVATING: | |
5bcb0f2b | 1148 | case SWAP_ACTIVATING_DONE: |
f2341e0a | 1149 | log_unit_warning(UNIT(s), "Activation timed out. Stopping."); |
50864457 | 1150 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT); |
e04aad61 LP |
1151 | break; |
1152 | ||
1153 | case SWAP_DEACTIVATING: | |
f2341e0a | 1154 | log_unit_warning(UNIT(s), "Deactivation timed out. Stopping."); |
e1770af8 | 1155 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT); |
e04aad61 LP |
1156 | break; |
1157 | ||
e04aad61 | 1158 | case SWAP_DEACTIVATING_SIGTERM: |
4819ff03 | 1159 | if (s->kill_context.send_sigkill) { |
50864457 | 1160 | log_unit_warning(UNIT(s), "Swap process timed out. Killing."); |
e1770af8 | 1161 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, SWAP_FAILURE_TIMEOUT); |
ba035df2 | 1162 | } else { |
50864457 LP |
1163 | log_unit_warning(UNIT(s), "Swap process timed out. Skipping SIGKILL. Ignoring."); |
1164 | swap_enter_dead_or_active(s, SWAP_FAILURE_TIMEOUT); | |
ba035df2 | 1165 | } |
e04aad61 LP |
1166 | break; |
1167 | ||
e04aad61 | 1168 | case SWAP_DEACTIVATING_SIGKILL: |
f2341e0a | 1169 | log_unit_warning(UNIT(s), "Swap process still around after SIGKILL. Ignoring."); |
50864457 | 1170 | swap_enter_dead_or_active(s, SWAP_FAILURE_TIMEOUT); |
e04aad61 LP |
1171 | break; |
1172 | ||
a8b689b7 YW |
1173 | case SWAP_CLEANING: |
1174 | log_unit_warning(UNIT(s), "Cleaning timed out. killing."); | |
1175 | ||
1176 | if (s->clean_result == SWAP_SUCCESS) | |
1177 | s->clean_result = SWAP_FAILURE_TIMEOUT; | |
1178 | ||
1179 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, 0); | |
1180 | break; | |
1181 | ||
e04aad61 LP |
1182 | default: |
1183 | assert_not_reached("Timeout at wrong time."); | |
1184 | } | |
718db961 LP |
1185 | |
1186 | return 0; | |
e04aad61 LP |
1187 | } |
1188 | ||
1189 | static int swap_load_proc_swaps(Manager *m, bool set_flags) { | |
1190 | unsigned i; | |
e04aad61 LP |
1191 | |
1192 | assert(m); | |
1193 | ||
07b0b134 | 1194 | rewind(m->proc_swaps); |
bab45044 | 1195 | |
4e85aff4 | 1196 | (void) fscanf(m->proc_swaps, "%*s %*s %*s %*s %*s\n"); |
07b0b134 | 1197 | |
e04aad61 | 1198 | for (i = 1;; i++) { |
9fb3675e | 1199 | _cleanup_free_ char *dev = NULL, *d = NULL; |
07b0b134 ML |
1200 | int prio = 0, k; |
1201 | ||
646134dc ZJS |
1202 | k = fscanf(m->proc_swaps, |
1203 | "%ms " /* device/file */ | |
1204 | "%*s " /* type of swap */ | |
1205 | "%*s " /* swap size */ | |
1206 | "%*s " /* used */ | |
1207 | "%i\n", /* priority */ | |
1208 | &dev, &prio); | |
1209 | if (k != 2) { | |
07b0b134 | 1210 | if (k == EOF) |
4e85aff4 | 1211 | break; |
07b0b134 | 1212 | |
628c89cc | 1213 | log_warning("Failed to parse /proc/swaps:%u.", i); |
e04aad61 | 1214 | continue; |
07b0b134 | 1215 | } |
07b0b134 | 1216 | |
527b7a42 | 1217 | if (cunescape(dev, UNESCAPE_RELAX, &d) < 0) |
628c89cc LP |
1218 | return log_oom(); |
1219 | ||
485ae697 | 1220 | device_found_node(m, d, DEVICE_FOUND_SWAP, DEVICE_FOUND_SWAP); |
4e85aff4 | 1221 | |
eb04385d | 1222 | (void) swap_process_new(m, d, prio, set_flags); |
07b0b134 ML |
1223 | } |
1224 | ||
eb04385d | 1225 | return 0; |
e04aad61 LP |
1226 | } |
1227 | ||
bcce581d | 1228 | static int swap_process_proc_swaps(Manager *m) { |
595ed347 | 1229 | Unit *u; |
4e434314 LP |
1230 | int r; |
1231 | ||
1232 | assert(m); | |
4e434314 | 1233 | |
646134dc ZJS |
1234 | r = swap_load_proc_swaps(m, true); |
1235 | if (r < 0) { | |
da927ba9 | 1236 | log_error_errno(r, "Failed to reread /proc/swaps: %m"); |
e04aad61 LP |
1237 | |
1238 | /* Reset flags, just in case, for late calls */ | |
595ed347 MS |
1239 | LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) { |
1240 | Swap *swap = SWAP(u); | |
e04aad61 LP |
1241 | |
1242 | swap->is_active = swap->just_activated = false; | |
1243 | } | |
1244 | ||
1245 | return 0; | |
1246 | } | |
1247 | ||
1248 | manager_dispatch_load_queue(m); | |
1249 | ||
595ed347 MS |
1250 | LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) { |
1251 | Swap *swap = SWAP(u); | |
e04aad61 LP |
1252 | |
1253 | if (!swap->is_active) { | |
e04aad61 | 1254 | |
e04aad61 LP |
1255 | swap_unset_proc_swaps(swap); |
1256 | ||
1257 | switch (swap->state) { | |
1258 | ||
1259 | case SWAP_ACTIVE: | |
ba6fbb2c | 1260 | /* This has just been deactivated */ |
e1770af8 | 1261 | swap_enter_dead(swap, SWAP_SUCCESS); |
e04aad61 LP |
1262 | break; |
1263 | ||
1264 | default: | |
5bcb0f2b | 1265 | /* Fire again */ |
e04aad61 LP |
1266 | swap_set_state(swap, swap->state); |
1267 | break; | |
1268 | } | |
1269 | ||
628c89cc | 1270 | if (swap->what) |
485ae697 | 1271 | device_found_node(m, swap->what, 0, DEVICE_FOUND_SWAP); |
628c89cc | 1272 | |
e04aad61 LP |
1273 | } else if (swap->just_activated) { |
1274 | ||
1275 | /* New swap entry */ | |
1276 | ||
1277 | switch (swap->state) { | |
1278 | ||
1279 | case SWAP_DEAD: | |
1280 | case SWAP_FAILED: | |
31135818 LP |
1281 | (void) unit_acquire_invocation_id(u); |
1282 | swap_cycle_clear(swap); | |
e1770af8 | 1283 | swap_enter_active(swap, SWAP_SUCCESS); |
e04aad61 LP |
1284 | break; |
1285 | ||
5bcb0f2b LP |
1286 | case SWAP_ACTIVATING: |
1287 | swap_set_state(swap, SWAP_ACTIVATING_DONE); | |
1288 | break; | |
1289 | ||
e04aad61 LP |
1290 | default: |
1291 | /* Nothing really changed, but let's | |
1292 | * issue an notification call | |
1293 | * nonetheless, in case somebody is | |
1294 | * waiting for this. */ | |
1295 | swap_set_state(swap, swap->state); | |
1296 | break; | |
1297 | } | |
1298 | } | |
1299 | ||
1300 | /* Reset the flags for later calls */ | |
1301 | swap->is_active = swap->just_activated = false; | |
1302 | } | |
1303 | ||
1304 | return 1; | |
1305 | } | |
1306 | ||
bcce581d LP |
1307 | static int swap_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) { |
1308 | Manager *m = userdata; | |
1309 | ||
1310 | assert(m); | |
1311 | assert(revents & EPOLLPRI); | |
1312 | ||
1313 | return swap_process_proc_swaps(m); | |
1314 | } | |
1315 | ||
e04aad61 LP |
1316 | static Unit *swap_following(Unit *u) { |
1317 | Swap *s = SWAP(u); | |
1318 | Swap *other, *first = NULL; | |
1319 | ||
1320 | assert(s); | |
1321 | ||
cdc89820 ZJS |
1322 | /* If the user configured the swap through /etc/fstab or |
1323 | * a device unit, follow that. */ | |
1324 | ||
1325 | if (s->from_fragment) | |
e04aad61 LP |
1326 | return NULL; |
1327 | ||
caac2704 | 1328 | LIST_FOREACH_OTHERS(same_devnode, other, s) |
cdc89820 ZJS |
1329 | if (other->from_fragment) |
1330 | return UNIT(other); | |
1331 | ||
b938cb90 | 1332 | /* Otherwise, make everybody follow the unit that's named after |
cdc89820 ZJS |
1333 | * the swap device in the kernel */ |
1334 | ||
1335 | if (streq_ptr(s->what, s->devnode)) | |
1336 | return NULL; | |
e04aad61 | 1337 | |
9670d583 LP |
1338 | LIST_FOREACH_AFTER(same_devnode, other, s) |
1339 | if (streq_ptr(other->what, other->devnode)) | |
e04aad61 LP |
1340 | return UNIT(other); |
1341 | ||
9670d583 LP |
1342 | LIST_FOREACH_BEFORE(same_devnode, other, s) { |
1343 | if (streq_ptr(other->what, other->devnode)) | |
e04aad61 LP |
1344 | return UNIT(other); |
1345 | ||
1346 | first = other; | |
1347 | } | |
1348 | ||
cdc89820 | 1349 | /* Fall back to the first on the list */ |
e04aad61 | 1350 | return UNIT(first); |
07b0b134 ML |
1351 | } |
1352 | ||
6210e7fc | 1353 | static int swap_following_set(Unit *u, Set **_set) { |
5bcb0f2b | 1354 | Swap *s = SWAP(u), *other; |
af4fa99d | 1355 | _cleanup_set_free_ Set *set = NULL; |
6210e7fc LP |
1356 | int r; |
1357 | ||
1358 | assert(s); | |
1359 | assert(_set); | |
1360 | ||
9670d583 | 1361 | if (LIST_JUST_US(same_devnode, s)) { |
6210e7fc LP |
1362 | *_set = NULL; |
1363 | return 0; | |
1364 | } | |
1365 | ||
d5099efc | 1366 | set = set_new(NULL); |
5bcb0f2b | 1367 | if (!set) |
6210e7fc LP |
1368 | return -ENOMEM; |
1369 | ||
caac2704 | 1370 | LIST_FOREACH_OTHERS(same_devnode, other, s) { |
5bcb0f2b LP |
1371 | r = set_put(set, other); |
1372 | if (r < 0) | |
95f14a3e | 1373 | return r; |
5bcb0f2b | 1374 | } |
6210e7fc | 1375 | |
95f14a3e | 1376 | *_set = TAKE_PTR(set); |
6210e7fc | 1377 | return 1; |
6210e7fc LP |
1378 | } |
1379 | ||
07b0b134 ML |
1380 | static void swap_shutdown(Manager *m) { |
1381 | assert(m); | |
1382 | ||
718db961 | 1383 | m->swap_event_source = sd_event_source_unref(m->swap_event_source); |
74ca738f | 1384 | m->proc_swaps = safe_fclose(m->proc_swaps); |
525d3cc7 | 1385 | m->swaps_by_devnode = hashmap_free(m->swaps_by_devnode); |
07b0b134 ML |
1386 | } |
1387 | ||
ba64af90 | 1388 | static void swap_enumerate(Manager *m) { |
07b0b134 | 1389 | int r; |
9670d583 | 1390 | |
07b0b134 ML |
1391 | assert(m); |
1392 | ||
4e434314 | 1393 | if (!m->proc_swaps) { |
646134dc | 1394 | m->proc_swaps = fopen("/proc/swaps", "re"); |
ba64af90 LP |
1395 | if (!m->proc_swaps) { |
1396 | if (errno == ENOENT) | |
cb209a04 | 1397 | log_debug_errno(errno, "Not swap enabled, skipping enumeration."); |
ba64af90 | 1398 | else |
cb209a04 | 1399 | log_warning_errno(errno, "Failed to open /proc/swaps, ignoring: %m"); |
ba64af90 LP |
1400 | |
1401 | return; | |
1402 | } | |
4e434314 | 1403 | |
151b9b96 | 1404 | r = sd_event_add_io(m->event, &m->swap_event_source, fileno(m->proc_swaps), EPOLLPRI, swap_dispatch_io, m); |
ba64af90 LP |
1405 | if (r < 0) { |
1406 | log_error_errno(r, "Failed to watch /proc/swaps: %m"); | |
29083707 | 1407 | goto fail; |
ba64af90 | 1408 | } |
29083707 LP |
1409 | |
1410 | /* Dispatch this before we dispatch SIGCHLD, so that | |
1411 | * we always get the events from /proc/swaps before | |
1412 | * the SIGCHLD of /sbin/swapon. */ | |
83231637 | 1413 | r = sd_event_source_set_priority(m->swap_event_source, SD_EVENT_PRIORITY_NORMAL-10); |
ba64af90 LP |
1414 | if (r < 0) { |
1415 | log_error_errno(r, "Failed to change /proc/swaps priority: %m"); | |
718db961 | 1416 | goto fail; |
ba64af90 | 1417 | } |
7dfbe2e3 TG |
1418 | |
1419 | (void) sd_event_source_set_description(m->swap_event_source, "swap-proc"); | |
4e434314 LP |
1420 | } |
1421 | ||
646134dc ZJS |
1422 | r = swap_load_proc_swaps(m, false); |
1423 | if (r < 0) | |
718db961 LP |
1424 | goto fail; |
1425 | ||
ba64af90 | 1426 | return; |
07b0b134 | 1427 | |
718db961 LP |
1428 | fail: |
1429 | swap_shutdown(m); | |
07b0b134 ML |
1430 | } |
1431 | ||
4366e598 | 1432 | int swap_process_device_new(Manager *m, sd_device *dev) { |
9670d583 | 1433 | _cleanup_free_ char *e = NULL; |
4366e598 | 1434 | const char *dn, *devlink; |
cabf58b2 | 1435 | Unit *u; |
c53aafb7 | 1436 | int r; |
9670d583 LP |
1437 | |
1438 | assert(m); | |
1439 | assert(dev); | |
1440 | ||
4366e598 YW |
1441 | r = sd_device_get_devname(dev, &dn); |
1442 | if (r < 0) | |
9670d583 LP |
1443 | return 0; |
1444 | ||
7410616c LP |
1445 | r = unit_name_from_path(dn, ".swap", &e); |
1446 | if (r < 0) | |
1447 | return r; | |
9670d583 | 1448 | |
cabf58b2 FB |
1449 | u = manager_get_unit(m, e); |
1450 | if (u) | |
1451 | r = swap_set_devnode(SWAP(u), dn); | |
9670d583 | 1452 | |
4366e598 | 1453 | FOREACH_DEVICE_DEVLINK(dev, devlink) { |
9670d583 | 1454 | _cleanup_free_ char *n = NULL; |
7410616c | 1455 | int q; |
9670d583 | 1456 | |
4366e598 | 1457 | q = unit_name_from_path(devlink, ".swap", &n); |
7410616c LP |
1458 | if (q < 0) |
1459 | return q; | |
9670d583 | 1460 | |
cabf58b2 FB |
1461 | u = manager_get_unit(m, n); |
1462 | if (u) { | |
1463 | q = swap_set_devnode(SWAP(u), dn); | |
9670d583 LP |
1464 | if (q < 0) |
1465 | r = q; | |
1466 | } | |
1467 | } | |
1468 | ||
1469 | return r; | |
1470 | } | |
1471 | ||
4366e598 | 1472 | int swap_process_device_remove(Manager *m, sd_device *dev) { |
9670d583 | 1473 | const char *dn; |
c53aafb7 | 1474 | int r; |
9670d583 LP |
1475 | Swap *s; |
1476 | ||
4366e598 YW |
1477 | r = sd_device_get_devname(dev, &dn); |
1478 | if (r < 0) | |
9670d583 LP |
1479 | return 0; |
1480 | ||
1481 | while ((s = hashmap_get(m->swaps_by_devnode, dn))) { | |
1482 | int q; | |
1483 | ||
1484 | q = swap_set_devnode(s, NULL); | |
1485 | if (q < 0) | |
1486 | r = q; | |
1487 | } | |
1488 | ||
1489 | return r; | |
1490 | } | |
1491 | ||
fdf20a31 | 1492 | static void swap_reset_failed(Unit *u) { |
5632e374 LP |
1493 | Swap *s = SWAP(u); |
1494 | ||
1495 | assert(s); | |
1496 | ||
fdf20a31 | 1497 | if (s->state == SWAP_FAILED) |
5632e374 | 1498 | swap_set_state(s, SWAP_DEAD); |
e04aad61 | 1499 | |
e1770af8 | 1500 | s->result = SWAP_SUCCESS; |
a8b689b7 | 1501 | s->clean_result = SWAP_SUCCESS; |
5632e374 LP |
1502 | } |
1503 | ||
718db961 | 1504 | static int swap_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) { |
814cc562 | 1505 | return unit_kill_common(u, who, signo, -1, SWAP(u)->control_pid, error); |
8a0867d6 LP |
1506 | } |
1507 | ||
7a7821c8 | 1508 | static int swap_get_timeout(Unit *u, usec_t *timeout) { |
68db7a3b | 1509 | Swap *s = SWAP(u); |
7a7821c8 | 1510 | usec_t t; |
68db7a3b ZJS |
1511 | int r; |
1512 | ||
1513 | if (!s->timer_event_source) | |
1514 | return 0; | |
1515 | ||
7a7821c8 | 1516 | r = sd_event_source_get_time(s->timer_event_source, &t); |
68db7a3b ZJS |
1517 | if (r < 0) |
1518 | return r; | |
7a7821c8 LP |
1519 | if (t == USEC_INFINITY) |
1520 | return 0; | |
68db7a3b | 1521 | |
7a7821c8 | 1522 | *timeout = t; |
68db7a3b ZJS |
1523 | return 1; |
1524 | } | |
1525 | ||
1c2e9646 | 1526 | static bool swap_supported(void) { |
0faacd47 LP |
1527 | static int supported = -1; |
1528 | ||
1529 | /* If swap support is not available in the kernel, or we are | |
1530 | * running in a container we don't support swap units, and any | |
1531 | * attempts to starting one should fail immediately. */ | |
1532 | ||
1533 | if (supported < 0) | |
1534 | supported = | |
1535 | access("/proc/swaps", F_OK) >= 0 && | |
75f86906 | 1536 | detect_container() <= 0; |
0faacd47 LP |
1537 | |
1538 | return supported; | |
1539 | } | |
1540 | ||
291d565a LP |
1541 | static int swap_control_pid(Unit *u) { |
1542 | Swap *s = SWAP(u); | |
1543 | ||
1544 | assert(s); | |
1545 | ||
1546 | return s->control_pid; | |
1547 | } | |
1548 | ||
a8b689b7 YW |
1549 | static int swap_clean(Unit *u, ExecCleanMask mask) { |
1550 | _cleanup_strv_free_ char **l = NULL; | |
1551 | Swap *s = SWAP(u); | |
1552 | int r; | |
1553 | ||
1554 | assert(s); | |
1555 | assert(mask != 0); | |
1556 | ||
1557 | if (s->state != SWAP_DEAD) | |
1558 | return -EBUSY; | |
1559 | ||
1560 | r = exec_context_get_clean_directories(&s->exec_context, u->manager->prefix, mask, &l); | |
1561 | if (r < 0) | |
1562 | return r; | |
1563 | ||
1564 | if (strv_isempty(l)) | |
1565 | return -EUNATCH; | |
1566 | ||
1567 | swap_unwatch_control_pid(s); | |
1568 | s->clean_result = SWAP_SUCCESS; | |
1569 | s->control_command = NULL; | |
1570 | s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; | |
1571 | ||
1572 | r = swap_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->exec_context.timeout_clean_usec)); | |
1573 | if (r < 0) | |
1574 | goto fail; | |
1575 | ||
1576 | r = unit_fork_and_watch_rm_rf(u, l, &s->control_pid); | |
1577 | if (r < 0) | |
1578 | goto fail; | |
1579 | ||
1580 | swap_set_state(s, SWAP_CLEANING); | |
1581 | ||
1582 | return 0; | |
1583 | ||
1584 | fail: | |
1585 | log_unit_warning_errno(u, r, "Failed to initiate cleaning: %m"); | |
1586 | s->clean_result = SWAP_FAILURE_RESOURCES; | |
1587 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); | |
1588 | return r; | |
1589 | } | |
1590 | ||
1591 | static int swap_can_clean(Unit *u, ExecCleanMask *ret) { | |
1592 | Swap *s = SWAP(u); | |
1593 | ||
1594 | assert(s); | |
1595 | ||
1596 | return exec_context_get_clean_mask(&s->exec_context, ret); | |
1597 | } | |
1598 | ||
e04aad61 LP |
1599 | static const char* const swap_exec_command_table[_SWAP_EXEC_COMMAND_MAX] = { |
1600 | [SWAP_EXEC_ACTIVATE] = "ExecActivate", | |
1601 | [SWAP_EXEC_DEACTIVATE] = "ExecDeactivate", | |
1602 | }; | |
1603 | ||
1604 | DEFINE_STRING_TABLE_LOOKUP(swap_exec_command, SwapExecCommand); | |
1605 | ||
e1770af8 LP |
1606 | static const char* const swap_result_table[_SWAP_RESULT_MAX] = { |
1607 | [SWAP_SUCCESS] = "success", | |
1608 | [SWAP_FAILURE_RESOURCES] = "resources", | |
1609 | [SWAP_FAILURE_TIMEOUT] = "timeout", | |
1610 | [SWAP_FAILURE_EXIT_CODE] = "exit-code", | |
1611 | [SWAP_FAILURE_SIGNAL] = "signal", | |
07299350 LP |
1612 | [SWAP_FAILURE_CORE_DUMP] = "core-dump", |
1613 | [SWAP_FAILURE_START_LIMIT_HIT] = "start-limit-hit", | |
e1770af8 LP |
1614 | }; |
1615 | ||
1616 | DEFINE_STRING_TABLE_LOOKUP(swap_result, SwapResult); | |
1617 | ||
07b0b134 | 1618 | const UnitVTable swap_vtable = { |
7d17cfbc | 1619 | .object_size = sizeof(Swap), |
718db961 LP |
1620 | .exec_context_offset = offsetof(Swap, exec_context), |
1621 | .cgroup_context_offset = offsetof(Swap, cgroup_context), | |
1622 | .kill_context_offset = offsetof(Swap, kill_context), | |
613b411c | 1623 | .exec_runtime_offset = offsetof(Swap, exec_runtime), |
29206d46 | 1624 | .dynamic_creds_offset = offsetof(Swap, dynamic_creds), |
3ef63c31 | 1625 | |
f975e971 LP |
1626 | .sections = |
1627 | "Unit\0" | |
1628 | "Swap\0" | |
1629 | "Install\0", | |
4ad49000 | 1630 | .private_section = "Swap", |
71645aca | 1631 | |
c80a9a33 LP |
1632 | .can_fail = true, |
1633 | ||
4e85aff4 | 1634 | .init = swap_init, |
07b0b134 | 1635 | .load = swap_load, |
6e620bec | 1636 | .done = swap_done, |
07b0b134 ML |
1637 | |
1638 | .coldplug = swap_coldplug, | |
1639 | ||
1640 | .dump = swap_dump, | |
1641 | ||
1642 | .start = swap_start, | |
1643 | .stop = swap_stop, | |
1644 | ||
8a0867d6 | 1645 | .kill = swap_kill, |
a8b689b7 YW |
1646 | .clean = swap_clean, |
1647 | .can_clean = swap_can_clean, | |
8a0867d6 | 1648 | |
68db7a3b ZJS |
1649 | .get_timeout = swap_get_timeout, |
1650 | ||
07b0b134 ML |
1651 | .serialize = swap_serialize, |
1652 | .deserialize_item = swap_deserialize_item, | |
1653 | ||
1654 | .active_state = swap_active_state, | |
1655 | .sub_state_to_string = swap_sub_state_to_string, | |
1656 | ||
52a12341 YW |
1657 | .will_restart = unit_will_restart_default, |
1658 | ||
f2f725e5 | 1659 | .may_gc = swap_may_gc, |
39c79477 | 1660 | .is_extrinsic = swap_is_extrinsic, |
07b0b134 | 1661 | |
e04aad61 | 1662 | .sigchld_event = swap_sigchld_event, |
e04aad61 LP |
1663 | |
1664 | .reset_failed = swap_reset_failed, | |
1665 | ||
291d565a LP |
1666 | .control_pid = swap_control_pid, |
1667 | ||
74c964d3 LP |
1668 | .bus_set_property = bus_swap_set_property, |
1669 | .bus_commit_properties = bus_swap_commit_properties, | |
07b0b134 | 1670 | |
e04aad61 | 1671 | .following = swap_following, |
6210e7fc | 1672 | .following_set = swap_following_set, |
5632e374 | 1673 | |
6e620bec | 1674 | .enumerate = swap_enumerate, |
c6918296 | 1675 | .shutdown = swap_shutdown, |
0faacd47 | 1676 | .supported = swap_supported, |
c6918296 MS |
1677 | |
1678 | .status_message_formats = { | |
1679 | .starting_stopping = { | |
1680 | [0] = "Activating swap %s...", | |
1681 | [1] = "Deactivating swap %s...", | |
1682 | }, | |
1683 | .finished_start_job = { | |
1684 | [JOB_DONE] = "Activated swap %s.", | |
1685 | [JOB_FAILED] = "Failed to activate swap %s.", | |
c6918296 MS |
1686 | [JOB_TIMEOUT] = "Timed out activating swap %s.", |
1687 | }, | |
1688 | .finished_stop_job = { | |
1689 | [JOB_DONE] = "Deactivated swap %s.", | |
1690 | [JOB_FAILED] = "Failed deactivating swap %s.", | |
1691 | [JOB_TIMEOUT] = "Timed out deactivating swap %s.", | |
1692 | }, | |
1693 | }, | |
07b0b134 | 1694 | }; |