]>
Commit | Line | Data |
---|---|---|
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 | 13 | #include "device-util.h" |
57b7a260 | 14 | #include "device.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" |
6bedfcbb | 20 | #include "parse-util.h" |
9eb977db | 21 | #include "path-util.h" |
7b3e062c | 22 | #include "process-util.h" |
d68c645b | 23 | #include "serialize.h" |
4f5dd394 | 24 | #include "special.h" |
8b43440b | 25 | #include "string-table.h" |
07630cea | 26 | #include "string-util.h" |
3ffd4af2 | 27 | #include "swap.h" |
4f5dd394 LP |
28 | #include "unit-name.h" |
29 | #include "unit.h" | |
30 | #include "virt.h" | |
07b0b134 ML |
31 | |
32 | static const UnitActiveState state_translation_table[_SWAP_STATE_MAX] = { | |
33 | [SWAP_DEAD] = UNIT_INACTIVE, | |
e04aad61 | 34 | [SWAP_ACTIVATING] = UNIT_ACTIVATING, |
5bcb0f2b | 35 | [SWAP_ACTIVATING_DONE] = UNIT_ACTIVE, |
07b0b134 | 36 | [SWAP_ACTIVE] = UNIT_ACTIVE, |
e04aad61 | 37 | [SWAP_DEACTIVATING] = UNIT_DEACTIVATING, |
e04aad61 LP |
38 | [SWAP_DEACTIVATING_SIGTERM] = UNIT_DEACTIVATING, |
39 | [SWAP_DEACTIVATING_SIGKILL] = UNIT_DEACTIVATING, | |
a8b689b7 YW |
40 | [SWAP_FAILED] = UNIT_FAILED, |
41 | [SWAP_CLEANING] = UNIT_MAINTENANCE, | |
07b0b134 ML |
42 | }; |
43 | ||
718db961 LP |
44 | static int swap_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata); |
45 | static int swap_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata); | |
bcce581d | 46 | static int swap_process_proc_swaps(Manager *m); |
718db961 | 47 | |
dedf3719 LP |
48 | static bool SWAP_STATE_WITH_PROCESS(SwapState state) { |
49 | return IN_SET(state, | |
50 | SWAP_ACTIVATING, | |
51 | SWAP_ACTIVATING_DONE, | |
52 | SWAP_DEACTIVATING, | |
53 | SWAP_DEACTIVATING_SIGTERM, | |
a8b689b7 YW |
54 | SWAP_DEACTIVATING_SIGKILL, |
55 | SWAP_CLEANING); | |
dedf3719 LP |
56 | } |
57 | ||
d1e8e8b5 | 58 | static UnitActiveState swap_active_state(Unit *u) { |
39c79477 ZJS |
59 | assert(u); |
60 | ||
61 | return state_translation_table[SWAP(u)->state]; | |
62 | } | |
63 | ||
d1e8e8b5 | 64 | static const char *swap_sub_state_to_string(Unit *u) { |
39c79477 ZJS |
65 | assert(u); |
66 | ||
67 | return swap_state_to_string(SWAP(u)->state); | |
68 | } | |
69 | ||
d1e8e8b5 | 70 | static bool swap_may_gc(Unit *u) { |
e9fa1bf7 | 71 | Swap *s = ASSERT_PTR(SWAP(u)); |
39c79477 ZJS |
72 | |
73 | if (s->from_proc_swaps) | |
74 | return false; | |
75 | ||
76 | return true; | |
77 | } | |
78 | ||
d1e8e8b5 | 79 | static bool swap_is_extrinsic(Unit *u) { |
39c79477 ZJS |
80 | assert(SWAP(u)); |
81 | ||
82 | return MANAGER_IS_USER(u->manager); | |
83 | } | |
84 | ||
e04aad61 | 85 | static void swap_unset_proc_swaps(Swap *s) { |
9670d583 LP |
86 | assert(s); |
87 | ||
88 | if (!s->from_proc_swaps) | |
89 | return; | |
90 | ||
a1e58e8e | 91 | s->parameters_proc_swaps.what = mfree(s->parameters_proc_swaps.what); |
9670d583 LP |
92 | s->from_proc_swaps = false; |
93 | } | |
94 | ||
95 | static int swap_set_devnode(Swap *s, const char *devnode) { | |
df326b84 | 96 | Hashmap *swaps; |
5bcb0f2b | 97 | Swap *first; |
9670d583 | 98 | int r; |
e04aad61 LP |
99 | |
100 | assert(s); | |
101 | ||
548f6937 | 102 | r = hashmap_ensure_allocated(&UNIT(s)->manager->swaps_by_devnode, &path_hash_ops); |
9670d583 LP |
103 | if (r < 0) |
104 | return r; | |
e04aad61 | 105 | |
9670d583 | 106 | swaps = UNIT(s)->manager->swaps_by_devnode; |
e04aad61 | 107 | |
9670d583 LP |
108 | if (s->devnode) { |
109 | first = hashmap_get(swaps, s->devnode); | |
e04aad61 | 110 | |
9670d583 LP |
111 | LIST_REMOVE(same_devnode, first, s); |
112 | if (first) | |
113 | hashmap_replace(swaps, first->devnode, first); | |
114 | else | |
115 | hashmap_remove(swaps, s->devnode); | |
5bcb0f2b | 116 | |
a1e58e8e | 117 | s->devnode = mfree(s->devnode); |
9670d583 LP |
118 | } |
119 | ||
120 | if (devnode) { | |
121 | s->devnode = strdup(devnode); | |
122 | if (!s->devnode) | |
123 | return -ENOMEM; | |
124 | ||
125 | first = hashmap_get(swaps, s->devnode); | |
126 | LIST_PREPEND(same_devnode, first, s); | |
127 | ||
128 | return hashmap_replace(swaps, first->devnode, first); | |
129 | } | |
130 | ||
131 | return 0; | |
e04aad61 LP |
132 | } |
133 | ||
f6cebb3b | 134 | static void swap_init(Unit *u) { |
e9fa1bf7 | 135 | Swap *s = ASSERT_PTR(SWAP(u)); |
6e620bec | 136 | |
e9fa1bf7 | 137 | assert(u->load_state == UNIT_STUB); |
6e620bec | 138 | |
c9e120e0 | 139 | s->timeout_usec = u->manager->defaults.timeout_start_usec; |
e04aad61 | 140 | |
c9e120e0 LP |
141 | s->exec_context.std_output = u->manager->defaults.std_output; |
142 | s->exec_context.std_error = u->manager->defaults.std_error; | |
085afe36 | 143 | |
436cdf0a | 144 | s->control_pid = PIDREF_NULL; |
e1770af8 | 145 | s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; |
c8f4d764 | 146 | |
5bcb0f2b | 147 | u->ignore_on_isolate = true; |
e04aad61 LP |
148 | } |
149 | ||
150 | static void swap_unwatch_control_pid(Swap *s) { | |
151 | assert(s); | |
ea1e0bf1 | 152 | unit_unwatch_pidref_done(UNIT(s), &s->control_pid); |
6e620bec LP |
153 | } |
154 | ||
4e85aff4 | 155 | static void swap_done(Unit *u) { |
e9fa1bf7 | 156 | Swap *s = ASSERT_PTR(SWAP(u)); |
07b0b134 | 157 | |
e04aad61 | 158 | swap_unset_proc_swaps(s); |
9670d583 | 159 | swap_set_devnode(s, NULL); |
e04aad61 | 160 | |
a1e58e8e LP |
161 | s->what = mfree(s->what); |
162 | s->parameters_fragment.what = mfree(s->parameters_fragment.what); | |
163 | s->parameters_fragment.options = mfree(s->parameters_fragment.options); | |
86b23b07 | 164 | |
28135da3 | 165 | s->exec_runtime = exec_runtime_free(s->exec_runtime); |
9cc54544 | 166 | |
e04aad61 LP |
167 | exec_command_done_array(s->exec_command, _SWAP_EXEC_COMMAND_MAX); |
168 | s->control_command = NULL; | |
169 | ||
170 | swap_unwatch_control_pid(s); | |
171 | ||
5dcadb4c | 172 | s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source); |
718db961 LP |
173 | } |
174 | ||
e9276800 | 175 | static int swap_arm_timer(Swap *s, bool relative, usec_t usec) { |
718db961 LP |
176 | assert(s); |
177 | ||
e9276800 | 178 | return unit_arm_timer(UNIT(s), &s->timer_event_source, relative, usec, swap_dispatch_timer); |
07b0b134 ML |
179 | } |
180 | ||
61f9cf4e LP |
181 | static SwapParameters* swap_get_parameters(Swap *s) { |
182 | assert(s); | |
183 | ||
184 | if (s->from_proc_swaps) | |
185 | return &s->parameters_proc_swaps; | |
186 | ||
187 | if (s->from_fragment) | |
188 | return &s->parameters_fragment; | |
189 | ||
190 | return NULL; | |
191 | } | |
192 | ||
eef85c4a | 193 | static int swap_add_device_dependencies(Swap *s) { |
61f9cf4e LP |
194 | UnitDependencyMask mask; |
195 | SwapParameters *p; | |
44b0d1fd | 196 | int r; |
61f9cf4e | 197 | |
173a8d04 LP |
198 | assert(s); |
199 | ||
200 | if (!s->what) | |
201 | return 0; | |
202 | ||
61f9cf4e | 203 | p = swap_get_parameters(s); |
d4a3494e | 204 | if (!p || !p->what) |
f10af76d LP |
205 | return 0; |
206 | ||
61f9cf4e LP |
207 | mask = s->from_proc_swaps ? UNIT_DEPENDENCY_PROC_SWAP : UNIT_DEPENDENCY_FILE; |
208 | ||
44b0d1fd LP |
209 | if (is_device_path(p->what)) { |
210 | r = unit_add_node_dependency(UNIT(s), p->what, UNIT_REQUIRES, mask); | |
211 | if (r < 0) | |
212 | return r; | |
213 | ||
214 | return unit_add_blockdev_dependency(UNIT(s), p->what, mask); | |
215 | } | |
9b88bb50 | 216 | |
61f9cf4e LP |
217 | /* File based swap devices need to be ordered after systemd-remount-fs.service, since they might need |
218 | * a writable file system. */ | |
219 | return unit_add_dependency_by_name(UNIT(s), UNIT_AFTER, SPECIAL_REMOUNT_FS_SERVICE, true, mask); | |
173a8d04 LP |
220 | } |
221 | ||
2edd4434 | 222 | static int swap_add_default_dependencies(Swap *s) { |
8bf23dc7 FB |
223 | int r; |
224 | ||
2edd4434 LP |
225 | assert(s); |
226 | ||
4c9ea260 LP |
227 | if (!UNIT(s)->default_dependencies) |
228 | return 0; | |
229 | ||
463d0d15 | 230 | if (!MANAGER_IS_SYSTEM(UNIT(s)->manager)) |
6b1dc2bd | 231 | return 0; |
2edd4434 | 232 | |
75f86906 | 233 | if (detect_container() > 0) |
c0387ebf LP |
234 | return 0; |
235 | ||
8bf23dc7 FB |
236 | /* swap units generated for the swap dev links are missing the |
237 | * ordering dep against the swap target. */ | |
35d8c19a | 238 | r = unit_add_dependency_by_name(UNIT(s), UNIT_BEFORE, SPECIAL_SWAP_TARGET, true, UNIT_DEPENDENCY_DEFAULT); |
8bf23dc7 FB |
239 | if (r < 0) |
240 | return r; | |
241 | ||
84214541 | 242 | return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, true, UNIT_DEPENDENCY_DEFAULT); |
2edd4434 LP |
243 | } |
244 | ||
4e85aff4 | 245 | static int swap_verify(Swap *s) { |
7fd1b19b | 246 | _cleanup_free_ char *e = NULL; |
7410616c | 247 | int r; |
4e85aff4 | 248 | |
e9fa1bf7 | 249 | assert(s); |
75193d41 | 250 | assert(UNIT(s)->load_state == UNIT_LOADED); |
4e85aff4 | 251 | |
7410616c LP |
252 | r = unit_name_from_path(s->what, ".swap", &e); |
253 | if (r < 0) | |
f2341e0a | 254 | return log_unit_error_errno(UNIT(s), r, "Failed to generate unit name from path: %m"); |
4e85aff4 | 255 | |
d85ff944 YW |
256 | if (!unit_has_name(UNIT(s), e)) |
257 | return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Value of What= and unit name do not match, not loading."); | |
4e85aff4 | 258 | |
d85ff944 YW |
259 | if (s->exec_context.pam_name && s->kill_context.kill_mode != KILL_CONTROL_GROUP) |
260 | return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOEXEC), "Unit has PAM enabled. Kill mode must be set to 'control-group'. Refusing to load."); | |
e04aad61 | 261 | |
4e85aff4 LP |
262 | return 0; |
263 | } | |
264 | ||
9670d583 | 265 | static 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 | 285 | static 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 | ||
347 | static 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 */ | |
c3620770 ZJS |
354 | bool fragment_optional = s->from_proc_swaps; |
355 | r = unit_load_fragment_and_dropin(u, !fragment_optional); | |
15332d73 | 356 | |
75193d41 ZJS |
357 | /* Add in some extras, and do so either when we successfully loaded something or when /proc/swaps is |
358 | * already active. */ | |
06721f39 LP |
359 | if (u->load_state == UNIT_LOADED || s->from_proc_swaps) |
360 | q = swap_add_extras(s); | |
15332d73 | 361 | |
06721f39 LP |
362 | if (r < 0) |
363 | return r; | |
364 | if (q < 0) | |
365 | return q; | |
75193d41 ZJS |
366 | if (u->load_state != UNIT_LOADED) |
367 | return 0; | |
07b0b134 ML |
368 | |
369 | return swap_verify(s); | |
370 | } | |
371 | ||
628c89cc | 372 | static int swap_setup_unit( |
4e85aff4 LP |
373 | Manager *m, |
374 | const char *what, | |
e04aad61 | 375 | const char *what_proc_swaps, |
4e85aff4 | 376 | int priority, |
e04aad61 LP |
377 | bool set_flags) { |
378 | ||
7fd1b19b | 379 | _cleanup_free_ char *e = NULL; |
e9fa1bf7 MY |
380 | bool new; |
381 | Unit *u; | |
382 | Swap *s; | |
4e85aff4 | 383 | SwapParameters *p; |
e9fa1bf7 | 384 | int r; |
4e85aff4 LP |
385 | |
386 | assert(m); | |
387 | assert(what); | |
6b1dc2bd | 388 | assert(what_proc_swaps); |
07b0b134 | 389 | |
7410616c LP |
390 | r = unit_name_from_path(what, ".swap", &e); |
391 | if (r < 0) | |
e9fa1bf7 | 392 | return log_error_errno(r, "Failed to generate unit name from path: %m"); |
07b0b134 | 393 | |
e04aad61 | 394 | u = manager_get_unit(m, e); |
e9fa1bf7 MY |
395 | if (u) { |
396 | s = ASSERT_PTR(SWAP(u)); | |
397 | ||
398 | if (s->from_proc_swaps && | |
399 | !path_equal(s->parameters_proc_swaps.what, what_proc_swaps)) | |
400 | return log_error_errno(SYNTHETIC_ERRNO(EEXIST), | |
401 | "Swap %s appeared twice with different device paths %s and %s, refusing.", | |
402 | e, s->parameters_proc_swaps.what, what_proc_swaps); | |
4e85aff4 | 403 | |
e9fa1bf7 MY |
404 | new = false; |
405 | } else { | |
406 | new = true; | |
07b0b134 | 407 | |
a581e45a | 408 | r = unit_new_for_name(m, sizeof(Swap), e, &u); |
b0ff5837 LP |
409 | if (r < 0) { |
410 | log_unit_warning_errno(u, r, "Failed to load swap unit: %m"); | |
e04aad61 | 411 | goto fail; |
b0ff5837 | 412 | } |
e04aad61 | 413 | |
e9fa1bf7 MY |
414 | s = ASSERT_PTR(SWAP(u)); |
415 | ||
416 | s->what = strdup(what); | |
417 | if (s->what) { | |
b0ff5837 | 418 | r = log_oom(); |
e04aad61 LP |
419 | goto fail; |
420 | } | |
421 | ||
422 | unit_add_to_load_queue(u); | |
e9fa1bf7 | 423 | } |
07b0b134 | 424 | |
e9fa1bf7 | 425 | p = &s->parameters_proc_swaps; |
07b0b134 | 426 | |
e9fa1bf7 | 427 | if (!s->parameters_proc_swaps.what) { |
5bcb0f2b LP |
428 | p->what = strdup(what_proc_swaps); |
429 | if (!p->what) { | |
b0ff5837 | 430 | r = log_oom(); |
6b1dc2bd LP |
431 | goto fail; |
432 | } | |
6b1dc2bd | 433 | } |
e04aad61 | 434 | |
46f94480 LP |
435 | /* The unit is definitely around now, mark it as loaded if it was previously referenced but could not be |
436 | * loaded. After all we can load it now, from the data in /proc/swaps. */ | |
437 | if (IN_SET(u->load_state, UNIT_NOT_FOUND, UNIT_BAD_SETTING, UNIT_ERROR)) { | |
438 | u->load_state = UNIT_LOADED; | |
439 | u->load_error = 0; | |
440 | } | |
441 | ||
6b1dc2bd | 442 | if (set_flags) { |
e9fa1bf7 MY |
443 | s->is_active = true; |
444 | s->just_activated = !SWAP(u)->from_proc_swaps; | |
4e85aff4 | 445 | } |
07b0b134 | 446 | |
e9fa1bf7 | 447 | s->from_proc_swaps = true; |
6b1dc2bd | 448 | |
4e85aff4 | 449 | p->priority = priority; |
7477451b | 450 | p->priority_set = true; |
07b0b134 | 451 | |
4e85aff4 | 452 | unit_add_to_dbus_queue(u); |
07b0b134 ML |
453 | return 0; |
454 | ||
455 | fail: | |
e9fa1bf7 | 456 | if (!new) |
07b0b134 ML |
457 | unit_free(u); |
458 | ||
4e85aff4 | 459 | return r; |
07b0b134 ML |
460 | } |
461 | ||
6aeb8c89 | 462 | static void swap_process_new(Manager *m, const char *device, int prio, bool set_flags) { |
4366e598 | 463 | _cleanup_(sd_device_unrefp) sd_device *d = NULL; |
a1af8372 | 464 | const char *dn; |
4366e598 | 465 | struct stat st, st_link; |
5bcb0f2b | 466 | int r; |
e04aad61 LP |
467 | |
468 | assert(m); | |
469 | ||
6aeb8c89 LP |
470 | if (swap_setup_unit(m, device, device, prio, set_flags) < 0) |
471 | return; | |
e04aad61 | 472 | |
5bcb0f2b LP |
473 | /* If this is a block device, then let's add duplicates for |
474 | * all other names of this block device */ | |
475 | if (stat(device, &st) < 0 || !S_ISBLK(st.st_mode)) | |
6aeb8c89 | 476 | return; |
e04aad61 | 477 | |
a1130022 | 478 | r = sd_device_new_from_stat_rdev(&d, &st); |
6aeb8c89 LP |
479 | if (r < 0) |
480 | return (void) log_full_errno(r == -ENOENT ? LOG_DEBUG : LOG_WARNING, r, | |
481 | "Failed to allocate device for swap %s: %m", device); | |
e04aad61 | 482 | |
5bcb0f2b | 483 | /* Add the main device node */ |
4366e598 | 484 | if (sd_device_get_devname(d, &dn) >= 0 && !streq(dn, device)) |
6aeb8c89 | 485 | (void) swap_setup_unit(m, dn, device, prio, set_flags); |
e04aad61 | 486 | |
5bcb0f2b | 487 | /* Add additional units for all symlinks */ |
4366e598 | 488 | FOREACH_DEVICE_DEVLINK(d, devlink) { |
e04aad61 | 489 | |
5bcb0f2b | 490 | /* Don't bother with the /dev/block links */ |
4366e598 | 491 | if (streq(devlink, device)) |
5bcb0f2b | 492 | continue; |
e04aad61 | 493 | |
4366e598 | 494 | if (path_startswith(devlink, "/dev/block/")) |
5bcb0f2b | 495 | continue; |
e04aad61 | 496 | |
4366e598 YW |
497 | if (stat(devlink, &st_link) >= 0 && |
498 | (!S_ISBLK(st_link.st_mode) || | |
499 | st_link.st_rdev != st.st_rdev)) | |
500 | continue; | |
e04aad61 | 501 | |
6aeb8c89 | 502 | (void) swap_setup_unit(m, devlink, device, prio, set_flags); |
e04aad61 | 503 | } |
e04aad61 LP |
504 | } |
505 | ||
07b0b134 ML |
506 | static void swap_set_state(Swap *s, SwapState state) { |
507 | SwapState old_state; | |
e04aad61 | 508 | |
07b0b134 ML |
509 | assert(s); |
510 | ||
6fcbec6f LP |
511 | if (s->state != state) |
512 | bus_unit_send_pending_change_signal(UNIT(s), false); | |
513 | ||
07b0b134 ML |
514 | old_state = s->state; |
515 | s->state = state; | |
516 | ||
dedf3719 | 517 | if (!SWAP_STATE_WITH_PROCESS(state)) { |
5dcadb4c | 518 | s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source); |
e04aad61 LP |
519 | swap_unwatch_control_pid(s); |
520 | s->control_command = NULL; | |
521 | s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; | |
522 | } | |
523 | ||
07b0b134 | 524 | if (state != old_state) |
f2341e0a | 525 | log_unit_debug(UNIT(s), "Changed %s -> %s", swap_state_to_string(old_state), swap_state_to_string(state)); |
07b0b134 | 526 | |
96b09de5 | 527 | unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], /* reload_success = */ true); |
37cf8fee LP |
528 | |
529 | /* If there other units for the same device node have a job | |
530 | queued it might be worth checking again if it is runnable | |
531 | now. This is necessary, since swap_start() refuses | |
532 | operation with EAGAIN if there's already another job for | |
533 | the same device node queued. */ | |
534 | LIST_FOREACH_OTHERS(same_devnode, other, s) | |
535 | if (UNIT(other)->job) | |
536 | job_add_to_run_queue(UNIT(other)->job); | |
07b0b134 ML |
537 | } |
538 | ||
be847e82 | 539 | static int swap_coldplug(Unit *u) { |
e9fa1bf7 | 540 | Swap *s = ASSERT_PTR(SWAP(u)); |
07b0b134 | 541 | SwapState new_state = SWAP_DEAD; |
e04aad61 | 542 | int r; |
07b0b134 | 543 | |
07b0b134 ML |
544 | assert(s->state == SWAP_DEAD); |
545 | ||
546 | if (s->deserialized_state != s->state) | |
547 | new_state = s->deserialized_state; | |
4e85aff4 | 548 | else if (s->from_proc_swaps) |
07b0b134 ML |
549 | new_state = SWAP_ACTIVE; |
550 | ||
5bcb0f2b LP |
551 | if (new_state == s->state) |
552 | return 0; | |
e04aad61 | 553 | |
436cdf0a | 554 | if (pidref_is_set(&s->control_pid) && |
4d9f092b | 555 | pidref_is_unwaited(&s->control_pid) > 0 && |
dedf3719 | 556 | SWAP_STATE_WITH_PROCESS(new_state)) { |
e04aad61 | 557 | |
495e75ed | 558 | r = unit_watch_pidref(UNIT(s), &s->control_pid, /* exclusive= */ false); |
5bcb0f2b LP |
559 | if (r < 0) |
560 | return r; | |
e04aad61 | 561 | |
e9276800 | 562 | r = swap_arm_timer(s, /* relative= */ false, usec_add(u->state_change_timestamp.monotonic, s->timeout_usec)); |
5bcb0f2b LP |
563 | if (r < 0) |
564 | return r; | |
e04aad61 | 565 | } |
07b0b134 | 566 | |
9cc54544 | 567 | if (!IN_SET(new_state, SWAP_DEAD, SWAP_FAILED)) { |
e8a565cb | 568 | (void) unit_setup_exec_runtime(u); |
9cc54544 LP |
569 | (void) unit_setup_cgroup_runtime(u); |
570 | } | |
29206d46 | 571 | |
5bcb0f2b | 572 | swap_set_state(s, new_state); |
07b0b134 ML |
573 | return 0; |
574 | } | |
575 | ||
576 | static void swap_dump(Unit *u, FILE *f, const char *prefix) { | |
e9fa1bf7 | 577 | Swap *s = ASSERT_PTR(SWAP(u)); |
4e85aff4 | 578 | SwapParameters *p; |
07b0b134 | 579 | |
4e85aff4 LP |
580 | assert(f); |
581 | ||
582 | if (s->from_proc_swaps) | |
583 | p = &s->parameters_proc_swaps; | |
584 | else if (s->from_fragment) | |
585 | p = &s->parameters_fragment; | |
b6bfc7bb LP |
586 | else |
587 | p = NULL; | |
07b0b134 ML |
588 | |
589 | fprintf(f, | |
4e85aff4 | 590 | "%sSwap State: %s\n" |
e1770af8 | 591 | "%sResult: %s\n" |
a8b689b7 | 592 | "%sClean Result: %s\n" |
07b0b134 | 593 | "%sWhat: %s\n" |
4e85aff4 | 594 | "%sFrom /proc/swaps: %s\n" |
39c79477 ZJS |
595 | "%sFrom fragment: %s\n" |
596 | "%sExtrinsic: %s\n", | |
07b0b134 | 597 | prefix, swap_state_to_string(s->state), |
e1770af8 | 598 | prefix, swap_result_to_string(s->result), |
a8b689b7 | 599 | prefix, swap_result_to_string(s->clean_result), |
07b0b134 | 600 | prefix, s->what, |
4e85aff4 | 601 | prefix, yes_no(s->from_proc_swaps), |
39c79477 ZJS |
602 | prefix, yes_no(s->from_fragment), |
603 | prefix, yes_no(swap_is_extrinsic(u))); | |
e04aad61 | 604 | |
9670d583 LP |
605 | if (s->devnode) |
606 | fprintf(f, "%sDevice Node: %s\n", prefix, s->devnode); | |
607 | ||
b6bfc7bb LP |
608 | if (p) |
609 | fprintf(f, | |
610 | "%sPriority: %i\n" | |
47cb901e | 611 | "%sOptions: %s\n", |
b6bfc7bb | 612 | prefix, p->priority, |
47cb901e | 613 | prefix, strempty(p->options)); |
b6bfc7bb | 614 | |
9bd0e1b8 YW |
615 | fprintf(f, |
616 | "%sTimeoutSec: %s\n", | |
5291f26d | 617 | prefix, FORMAT_TIMESPAN(s->timeout_usec, USEC_PER_SEC)); |
9bd0e1b8 | 618 | |
436cdf0a | 619 | if (pidref_is_set(&s->control_pid)) |
e04aad61 | 620 | fprintf(f, |
de0671ee | 621 | "%sControl PID: "PID_FMT"\n", |
436cdf0a | 622 | prefix, s->control_pid.pid); |
e04aad61 LP |
623 | |
624 | exec_context_dump(&s->exec_context, f, prefix); | |
4819ff03 | 625 | kill_context_dump(&s->kill_context, f, prefix); |
bc0623df | 626 | cgroup_context_dump(UNIT(s), f, prefix); |
e04aad61 LP |
627 | } |
628 | ||
436cdf0a | 629 | static int swap_spawn(Swap *s, ExecCommand *c, PidRef *ret_pid) { |
fba173ff | 630 | _cleanup_(exec_params_shallow_clear) ExecParameters exec_params = EXEC_PARAMETERS_INIT( |
b646fc32 | 631 | EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN); |
436cdf0a | 632 | _cleanup_(pidref_done) PidRef pidref = PIDREF_NULL; |
3c7416b6 | 633 | int r; |
e04aad61 LP |
634 | |
635 | assert(s); | |
636 | assert(c); | |
436cdf0a | 637 | assert(ret_pid); |
e04aad61 | 638 | |
3c7416b6 | 639 | r = unit_prepare_exec(UNIT(s)); |
29206d46 | 640 | if (r < 0) |
3c7416b6 | 641 | return r; |
29206d46 | 642 | |
e9276800 | 643 | r = swap_arm_timer(s, /* relative= */ true, s->timeout_usec); |
646134dc | 644 | if (r < 0) |
894a30ef | 645 | return r; |
e04aad61 | 646 | |
1ad6e8b3 LP |
647 | r = unit_set_exec_params(UNIT(s), &exec_params); |
648 | if (r < 0) | |
894a30ef | 649 | return r; |
9fa95f85 | 650 | |
f2341e0a LP |
651 | r = exec_spawn(UNIT(s), |
652 | c, | |
646134dc | 653 | &s->exec_context, |
9fa95f85 | 654 | &exec_params, |
613b411c | 655 | s->exec_runtime, |
6bb00842 | 656 | &s->cgroup_context, |
556d2bc4 | 657 | &pidref); |
646134dc | 658 | if (r < 0) |
894a30ef | 659 | return r; |
e04aad61 | 660 | |
495e75ed | 661 | r = unit_watch_pidref(UNIT(s), &pidref, /* exclusive= */ true); |
436cdf0a | 662 | if (r < 0) |
894a30ef | 663 | return r; |
e04aad61 | 664 | |
436cdf0a | 665 | *ret_pid = TAKE_PIDREF(pidref); |
e04aad61 | 666 | return 0; |
07b0b134 ML |
667 | } |
668 | ||
e1770af8 | 669 | static void swap_enter_dead(Swap *s, SwapResult f) { |
07b0b134 ML |
670 | assert(s); |
671 | ||
a0fef983 | 672 | if (s->result == SWAP_SUCCESS) |
e1770af8 | 673 | s->result = f; |
e04aad61 | 674 | |
aac99f30 | 675 | unit_log_result(UNIT(s), s->result == SWAP_SUCCESS, swap_result_to_string(s->result)); |
4c425434 | 676 | unit_warn_leftover_processes(UNIT(s), unit_log_leftover_process_stop); |
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 | |
bb0c0d6f | 681 | unit_destroy_runtime_data(UNIT(s), &s->exec_context); |
e66cf1a3 | 682 | |
00d9ef85 | 683 | unit_unref_uid_gid(UNIT(s), true); |
07b0b134 ML |
684 | } |
685 | ||
e1770af8 | 686 | static 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 |
695 | static 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 |
708 | static 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 | 719 | static 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 | ||
748 | fail: | |
50864457 | 749 | swap_enter_dead_or_active(s, SWAP_FAILURE_RESOURCES); |
e04aad61 LP |
750 | } |
751 | ||
752 | static void swap_enter_activating(Swap *s) { | |
bf1d7ba7 KZ |
753 | _cleanup_free_ char *opts = NULL; |
754 | int r; | |
e04aad61 LP |
755 | |
756 | assert(s); | |
757 | ||
4c425434 | 758 | unit_warn_leftover_processes(UNIT(s), unit_log_leftover_process_start); |
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 | ||
816 | fail: | |
50864457 | 817 | swap_enter_dead_or_active(s, SWAP_FAILURE_RESOURCES); |
e04aad61 LP |
818 | } |
819 | ||
e1770af8 | 820 | static 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 | ||
848 | fail: | |
50864457 | 849 | swap_enter_dead_or_active(s, SWAP_FAILURE_RESOURCES); |
e04aad61 LP |
850 | } |
851 | ||
31135818 LP |
852 | static 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 | 862 | static 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 | ||
901 | static 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 | ||
935 | static 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 | ||
951 | static 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 | |
436cdf0a | 974 | pidref_done(&s->control_pid); |
2a7451dc | 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 | 993 | static 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 | 1069 | static 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 | ||
1118 | static 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 | 1156 | static 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 LP |
1195 | swap_set_state(swap, swap->state); |
1196 | break; | |
1197 | } | |
1198 | ||
628c89cc | 1199 | if (swap->what) |
b1ba0ce8 | 1200 | device_found_node(m, swap->what, DEVICE_NOT_FOUND, DEVICE_FOUND_SWAP); |
628c89cc | 1201 | |
e04aad61 LP |
1202 | } else if (swap->just_activated) { |
1203 | ||
1204 | /* New swap entry */ | |
1205 | ||
1206 | switch (swap->state) { | |
1207 | ||
1208 | case SWAP_DEAD: | |
1209 | case SWAP_FAILED: | |
31135818 LP |
1210 | (void) unit_acquire_invocation_id(u); |
1211 | swap_cycle_clear(swap); | |
e1770af8 | 1212 | swap_enter_active(swap, SWAP_SUCCESS); |
e04aad61 LP |
1213 | break; |
1214 | ||
5bcb0f2b LP |
1215 | case SWAP_ACTIVATING: |
1216 | swap_set_state(swap, SWAP_ACTIVATING_DONE); | |
1217 | break; | |
1218 | ||
e04aad61 LP |
1219 | default: |
1220 | /* Nothing really changed, but let's | |
1221 | * issue an notification call | |
1222 | * nonetheless, in case somebody is | |
1223 | * waiting for this. */ | |
1224 | swap_set_state(swap, swap->state); | |
1225 | break; | |
1226 | } | |
1227 | } | |
1228 | ||
1229 | /* Reset the flags for later calls */ | |
1230 | swap->is_active = swap->just_activated = false; | |
1231 | } | |
1232 | ||
1233 | return 1; | |
1234 | } | |
1235 | ||
bcce581d | 1236 | static int swap_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) { |
99534007 | 1237 | Manager *m = ASSERT_PTR(userdata); |
bcce581d | 1238 | |
bcce581d LP |
1239 | assert(revents & EPOLLPRI); |
1240 | ||
1241 | return swap_process_proc_swaps(m); | |
1242 | } | |
1243 | ||
e9fa1bf7 MY |
1244 | static Unit* swap_following(Unit *u) { |
1245 | Swap *s = ASSERT_PTR(SWAP(u)); | |
03677889 | 1246 | Swap *first = NULL; |
e04aad61 | 1247 | |
cdc89820 ZJS |
1248 | /* If the user configured the swap through /etc/fstab or |
1249 | * a device unit, follow that. */ | |
1250 | ||
1251 | if (s->from_fragment) | |
e04aad61 LP |
1252 | return NULL; |
1253 | ||
caac2704 | 1254 | LIST_FOREACH_OTHERS(same_devnode, other, s) |
cdc89820 ZJS |
1255 | if (other->from_fragment) |
1256 | return UNIT(other); | |
1257 | ||
b938cb90 | 1258 | /* Otherwise, make everybody follow the unit that's named after |
cdc89820 ZJS |
1259 | * the swap device in the kernel */ |
1260 | ||
1261 | if (streq_ptr(s->what, s->devnode)) | |
1262 | return NULL; | |
e04aad61 | 1263 | |
bd335c96 | 1264 | LIST_FOREACH(same_devnode, other, s->same_devnode_next) |
9670d583 | 1265 | if (streq_ptr(other->what, other->devnode)) |
e04aad61 LP |
1266 | return UNIT(other); |
1267 | ||
bd335c96 | 1268 | LIST_FOREACH_BACKWARDS(same_devnode, other, s->same_devnode_prev) { |
9670d583 | 1269 | if (streq_ptr(other->what, other->devnode)) |
e04aad61 LP |
1270 | return UNIT(other); |
1271 | ||
1272 | first = other; | |
1273 | } | |
1274 | ||
cdc89820 | 1275 | /* Fall back to the first on the list */ |
e04aad61 | 1276 | return UNIT(first); |
07b0b134 ML |
1277 | } |
1278 | ||
e9fa1bf7 MY |
1279 | static int swap_following_set(Unit *u, Set **ret) { |
1280 | Swap *s = ASSERT_PTR(SWAP(u)); | |
af4fa99d | 1281 | _cleanup_set_free_ Set *set = NULL; |
6210e7fc LP |
1282 | int r; |
1283 | ||
e9fa1bf7 | 1284 | assert(ret); |
6210e7fc | 1285 | |
9670d583 | 1286 | if (LIST_JUST_US(same_devnode, s)) { |
e9fa1bf7 | 1287 | *ret = NULL; |
6210e7fc LP |
1288 | return 0; |
1289 | } | |
1290 | ||
d5099efc | 1291 | set = set_new(NULL); |
5bcb0f2b | 1292 | if (!set) |
6210e7fc LP |
1293 | return -ENOMEM; |
1294 | ||
caac2704 | 1295 | LIST_FOREACH_OTHERS(same_devnode, other, s) { |
5bcb0f2b LP |
1296 | r = set_put(set, other); |
1297 | if (r < 0) | |
95f14a3e | 1298 | return r; |
5bcb0f2b | 1299 | } |
6210e7fc | 1300 | |
e9fa1bf7 | 1301 | *ret = TAKE_PTR(set); |
6210e7fc | 1302 | return 1; |
6210e7fc LP |
1303 | } |
1304 | ||
07b0b134 ML |
1305 | static void swap_shutdown(Manager *m) { |
1306 | assert(m); | |
1307 | ||
5dcadb4c | 1308 | m->swap_event_source = sd_event_source_disable_unref(m->swap_event_source); |
74ca738f | 1309 | m->proc_swaps = safe_fclose(m->proc_swaps); |
525d3cc7 | 1310 | m->swaps_by_devnode = hashmap_free(m->swaps_by_devnode); |
07b0b134 ML |
1311 | } |
1312 | ||
ba64af90 | 1313 | static void swap_enumerate(Manager *m) { |
07b0b134 | 1314 | int r; |
9670d583 | 1315 | |
07b0b134 ML |
1316 | assert(m); |
1317 | ||
4e434314 | 1318 | if (!m->proc_swaps) { |
646134dc | 1319 | m->proc_swaps = fopen("/proc/swaps", "re"); |
ba64af90 LP |
1320 | if (!m->proc_swaps) { |
1321 | if (errno == ENOENT) | |
cb209a04 | 1322 | log_debug_errno(errno, "Not swap enabled, skipping enumeration."); |
ba64af90 | 1323 | else |
cb209a04 | 1324 | log_warning_errno(errno, "Failed to open /proc/swaps, ignoring: %m"); |
ba64af90 LP |
1325 | |
1326 | return; | |
1327 | } | |
4e434314 | 1328 | |
151b9b96 | 1329 | r = sd_event_add_io(m->event, &m->swap_event_source, fileno(m->proc_swaps), EPOLLPRI, swap_dispatch_io, m); |
ba64af90 LP |
1330 | if (r < 0) { |
1331 | log_error_errno(r, "Failed to watch /proc/swaps: %m"); | |
29083707 | 1332 | goto fail; |
ba64af90 | 1333 | } |
29083707 LP |
1334 | |
1335 | /* Dispatch this before we dispatch SIGCHLD, so that | |
1336 | * we always get the events from /proc/swaps before | |
1337 | * the SIGCHLD of /sbin/swapon. */ | |
d42b61d2 | 1338 | r = sd_event_source_set_priority(m->swap_event_source, EVENT_PRIORITY_SWAP_TABLE); |
ba64af90 LP |
1339 | if (r < 0) { |
1340 | log_error_errno(r, "Failed to change /proc/swaps priority: %m"); | |
718db961 | 1341 | goto fail; |
ba64af90 | 1342 | } |
7dfbe2e3 TG |
1343 | |
1344 | (void) sd_event_source_set_description(m->swap_event_source, "swap-proc"); | |
4e434314 LP |
1345 | } |
1346 | ||
646134dc ZJS |
1347 | r = swap_load_proc_swaps(m, false); |
1348 | if (r < 0) | |
718db961 LP |
1349 | goto fail; |
1350 | ||
ba64af90 | 1351 | return; |
07b0b134 | 1352 | |
718db961 LP |
1353 | fail: |
1354 | swap_shutdown(m); | |
07b0b134 ML |
1355 | } |
1356 | ||
4366e598 | 1357 | int swap_process_device_new(Manager *m, sd_device *dev) { |
9670d583 | 1358 | _cleanup_free_ char *e = NULL; |
a1af8372 | 1359 | const char *dn; |
cabf58b2 | 1360 | Unit *u; |
c53aafb7 | 1361 | int r; |
9670d583 LP |
1362 | |
1363 | assert(m); | |
1364 | assert(dev); | |
1365 | ||
e82c6e8b | 1366 | if (sd_device_get_devname(dev, &dn) < 0) |
9670d583 LP |
1367 | return 0; |
1368 | ||
7410616c | 1369 | r = unit_name_from_path(dn, ".swap", &e); |
e82c6e8b LP |
1370 | if (r < 0) { |
1371 | log_debug_errno(r, "Cannot convert device name '%s' to unit name, ignoring: %m", dn); | |
1372 | return 0; | |
1373 | } | |
9670d583 | 1374 | |
cabf58b2 FB |
1375 | u = manager_get_unit(m, e); |
1376 | if (u) | |
1377 | r = swap_set_devnode(SWAP(u), dn); | |
9670d583 | 1378 | |
4366e598 | 1379 | FOREACH_DEVICE_DEVLINK(dev, devlink) { |
9670d583 | 1380 | _cleanup_free_ char *n = NULL; |
7410616c | 1381 | int q; |
9670d583 | 1382 | |
4366e598 | 1383 | q = unit_name_from_path(devlink, ".swap", &n); |
03e52e8c | 1384 | if (q == -EINVAL) /* If the name is not convertible to unit name, we can't manage it */ |
598a6a84 | 1385 | continue; |
7410616c LP |
1386 | if (q < 0) |
1387 | return q; | |
9670d583 | 1388 | |
cabf58b2 FB |
1389 | u = manager_get_unit(m, n); |
1390 | if (u) { | |
1391 | q = swap_set_devnode(SWAP(u), dn); | |
9670d583 LP |
1392 | if (q < 0) |
1393 | r = q; | |
1394 | } | |
1395 | } | |
1396 | ||
1397 | return r; | |
1398 | } | |
1399 | ||
4366e598 | 1400 | int swap_process_device_remove(Manager *m, sd_device *dev) { |
9670d583 | 1401 | const char *dn; |
c53aafb7 | 1402 | int r; |
9670d583 LP |
1403 | Swap *s; |
1404 | ||
4366e598 YW |
1405 | r = sd_device_get_devname(dev, &dn); |
1406 | if (r < 0) | |
9670d583 LP |
1407 | return 0; |
1408 | ||
1409 | while ((s = hashmap_get(m->swaps_by_devnode, dn))) { | |
1410 | int q; | |
1411 | ||
1412 | q = swap_set_devnode(s, NULL); | |
1413 | if (q < 0) | |
1414 | r = q; | |
1415 | } | |
1416 | ||
1417 | return r; | |
1418 | } | |
1419 | ||
fdf20a31 | 1420 | static void swap_reset_failed(Unit *u) { |
e9fa1bf7 | 1421 | Swap *s = ASSERT_PTR(SWAP(u)); |
5632e374 | 1422 | |
fdf20a31 | 1423 | if (s->state == SWAP_FAILED) |
5632e374 | 1424 | swap_set_state(s, SWAP_DEAD); |
e04aad61 | 1425 | |
e1770af8 | 1426 | s->result = SWAP_SUCCESS; |
a8b689b7 | 1427 | s->clean_result = SWAP_SUCCESS; |
5632e374 LP |
1428 | } |
1429 | ||
7a7821c8 | 1430 | static int swap_get_timeout(Unit *u, usec_t *timeout) { |
e9fa1bf7 | 1431 | Swap *s = ASSERT_PTR(SWAP(u)); |
7a7821c8 | 1432 | usec_t t; |
68db7a3b ZJS |
1433 | int r; |
1434 | ||
1435 | if (!s->timer_event_source) | |
1436 | return 0; | |
1437 | ||
7a7821c8 | 1438 | r = sd_event_source_get_time(s->timer_event_source, &t); |
68db7a3b ZJS |
1439 | if (r < 0) |
1440 | return r; | |
7a7821c8 LP |
1441 | if (t == USEC_INFINITY) |
1442 | return 0; | |
68db7a3b | 1443 | |
7a7821c8 | 1444 | *timeout = t; |
68db7a3b ZJS |
1445 | return 1; |
1446 | } | |
1447 | ||
1c2e9646 | 1448 | static bool swap_supported(void) { |
0faacd47 LP |
1449 | static int supported = -1; |
1450 | ||
1451 | /* If swap support is not available in the kernel, or we are | |
1452 | * running in a container we don't support swap units, and any | |
1453 | * attempts to starting one should fail immediately. */ | |
1454 | ||
1455 | if (supported < 0) | |
1456 | supported = | |
1457 | access("/proc/swaps", F_OK) >= 0 && | |
75f86906 | 1458 | detect_container() <= 0; |
0faacd47 LP |
1459 | |
1460 | return supported; | |
1461 | } | |
1462 | ||
37eb258e LP |
1463 | static PidRef* swap_control_pid(Unit *u) { |
1464 | return &ASSERT_PTR(SWAP(u))->control_pid; | |
291d565a LP |
1465 | } |
1466 | ||
a8b689b7 | 1467 | static int swap_clean(Unit *u, ExecCleanMask mask) { |
e9fa1bf7 | 1468 | Swap *s = ASSERT_PTR(SWAP(u)); |
a8b689b7 | 1469 | _cleanup_strv_free_ char **l = NULL; |
a8b689b7 YW |
1470 | int r; |
1471 | ||
a8b689b7 YW |
1472 | assert(mask != 0); |
1473 | ||
1474 | if (s->state != SWAP_DEAD) | |
1475 | return -EBUSY; | |
1476 | ||
1477 | r = exec_context_get_clean_directories(&s->exec_context, u->manager->prefix, mask, &l); | |
1478 | if (r < 0) | |
1479 | return r; | |
1480 | ||
1481 | if (strv_isempty(l)) | |
1482 | return -EUNATCH; | |
1483 | ||
1484 | swap_unwatch_control_pid(s); | |
1485 | s->clean_result = SWAP_SUCCESS; | |
1486 | s->control_command = NULL; | |
1487 | s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; | |
1488 | ||
e9276800 | 1489 | r = swap_arm_timer(s, /* relative= */ true, s->exec_context.timeout_clean_usec); |
b0ff5837 LP |
1490 | if (r < 0) { |
1491 | log_unit_warning_errno(u, r, "Failed to install timer: %m"); | |
a8b689b7 | 1492 | goto fail; |
b0ff5837 | 1493 | } |
a8b689b7 | 1494 | |
4775b55d | 1495 | r = unit_fork_and_watch_rm_rf(u, l, &s->control_pid); |
b0ff5837 LP |
1496 | if (r < 0) { |
1497 | log_unit_warning_errno(u, r, "Failed to spawn cleaning task: %m"); | |
436cdf0a | 1498 | goto fail; |
b0ff5837 | 1499 | } |
a8b689b7 | 1500 | |
436cdf0a | 1501 | swap_set_state(s, SWAP_CLEANING); |
a8b689b7 YW |
1502 | return 0; |
1503 | ||
1504 | fail: | |
a8b689b7 | 1505 | s->clean_result = SWAP_FAILURE_RESOURCES; |
5dcadb4c | 1506 | s->timer_event_source = sd_event_source_disable_unref(s->timer_event_source); |
a8b689b7 YW |
1507 | return r; |
1508 | } | |
1509 | ||
1510 | static int swap_can_clean(Unit *u, ExecCleanMask *ret) { | |
e9fa1bf7 | 1511 | Swap *s = ASSERT_PTR(SWAP(u)); |
a8b689b7 YW |
1512 | |
1513 | return exec_context_get_clean_mask(&s->exec_context, ret); | |
1514 | } | |
1515 | ||
705578c3 | 1516 | static int swap_can_start(Unit *u) { |
e9fa1bf7 | 1517 | Swap *s = ASSERT_PTR(SWAP(u)); |
9727f242 DDM |
1518 | int r; |
1519 | ||
9727f242 DDM |
1520 | r = unit_test_start_limit(u); |
1521 | if (r < 0) { | |
1522 | swap_enter_dead(s, SWAP_FAILURE_START_LIMIT_HIT); | |
1523 | return r; | |
1524 | } | |
1525 | ||
705578c3 | 1526 | return 1; |
9727f242 DDM |
1527 | } |
1528 | ||
f57cc32f DDM |
1529 | int swap_get_priority(const Swap *s) { |
1530 | assert(s); | |
1531 | ||
1532 | if (s->from_proc_swaps && s->parameters_proc_swaps.priority_set) | |
1533 | return s->parameters_proc_swaps.priority; | |
1534 | ||
1535 | if (s->from_fragment && s->parameters_fragment.priority_set) | |
1536 | return s->parameters_fragment.priority; | |
1537 | ||
1538 | return -1; | |
1539 | } | |
1540 | ||
1541 | const char* swap_get_options(const Swap *s) { | |
1542 | assert(s); | |
1543 | ||
1544 | if (s->from_fragment) | |
1545 | return s->parameters_fragment.options; | |
1546 | ||
1547 | return NULL; | |
1548 | } | |
1549 | ||
e04aad61 | 1550 | static const char* const swap_exec_command_table[_SWAP_EXEC_COMMAND_MAX] = { |
48d83e33 | 1551 | [SWAP_EXEC_ACTIVATE] = "ExecActivate", |
e04aad61 LP |
1552 | [SWAP_EXEC_DEACTIVATE] = "ExecDeactivate", |
1553 | }; | |
1554 | ||
1555 | DEFINE_STRING_TABLE_LOOKUP(swap_exec_command, SwapExecCommand); | |
1556 | ||
e1770af8 | 1557 | static const char* const swap_result_table[_SWAP_RESULT_MAX] = { |
48d83e33 ZJS |
1558 | [SWAP_SUCCESS] = "success", |
1559 | [SWAP_FAILURE_RESOURCES] = "resources", | |
1560 | [SWAP_FAILURE_TIMEOUT] = "timeout", | |
1561 | [SWAP_FAILURE_EXIT_CODE] = "exit-code", | |
1562 | [SWAP_FAILURE_SIGNAL] = "signal", | |
1563 | [SWAP_FAILURE_CORE_DUMP] = "core-dump", | |
07299350 | 1564 | [SWAP_FAILURE_START_LIMIT_HIT] = "start-limit-hit", |
e1770af8 LP |
1565 | }; |
1566 | ||
1567 | DEFINE_STRING_TABLE_LOOKUP(swap_result, SwapResult); | |
1568 | ||
07b0b134 | 1569 | const UnitVTable swap_vtable = { |
7d17cfbc | 1570 | .object_size = sizeof(Swap), |
718db961 LP |
1571 | .exec_context_offset = offsetof(Swap, exec_context), |
1572 | .cgroup_context_offset = offsetof(Swap, cgroup_context), | |
1573 | .kill_context_offset = offsetof(Swap, kill_context), | |
613b411c | 1574 | .exec_runtime_offset = offsetof(Swap, exec_runtime), |
9cc54544 | 1575 | .cgroup_runtime_offset = offsetof(Swap, cgroup_runtime), |
3ef63c31 | 1576 | |
f975e971 LP |
1577 | .sections = |
1578 | "Unit\0" | |
1579 | "Swap\0" | |
1580 | "Install\0", | |
4ad49000 | 1581 | .private_section = "Swap", |
71645aca | 1582 | |
c80a9a33 LP |
1583 | .can_fail = true, |
1584 | ||
4e85aff4 | 1585 | .init = swap_init, |
07b0b134 | 1586 | .load = swap_load, |
6e620bec | 1587 | .done = swap_done, |
07b0b134 ML |
1588 | |
1589 | .coldplug = swap_coldplug, | |
1590 | ||
1591 | .dump = swap_dump, | |
1592 | ||
1593 | .start = swap_start, | |
1594 | .stop = swap_stop, | |
1595 | ||
a8b689b7 YW |
1596 | .clean = swap_clean, |
1597 | .can_clean = swap_can_clean, | |
8a0867d6 | 1598 | |
68db7a3b ZJS |
1599 | .get_timeout = swap_get_timeout, |
1600 | ||
07b0b134 ML |
1601 | .serialize = swap_serialize, |
1602 | .deserialize_item = swap_deserialize_item, | |
1603 | ||
1604 | .active_state = swap_active_state, | |
1605 | .sub_state_to_string = swap_sub_state_to_string, | |
1606 | ||
52a12341 YW |
1607 | .will_restart = unit_will_restart_default, |
1608 | ||
f2f725e5 | 1609 | .may_gc = swap_may_gc, |
39c79477 | 1610 | .is_extrinsic = swap_is_extrinsic, |
07b0b134 | 1611 | |
e04aad61 | 1612 | .sigchld_event = swap_sigchld_event, |
e04aad61 LP |
1613 | |
1614 | .reset_failed = swap_reset_failed, | |
1615 | ||
291d565a LP |
1616 | .control_pid = swap_control_pid, |
1617 | ||
74c964d3 LP |
1618 | .bus_set_property = bus_swap_set_property, |
1619 | .bus_commit_properties = bus_swap_commit_properties, | |
07b0b134 | 1620 | |
e04aad61 | 1621 | .following = swap_following, |
6210e7fc | 1622 | .following_set = swap_following_set, |
5632e374 | 1623 | |
6e620bec | 1624 | .enumerate = swap_enumerate, |
c6918296 | 1625 | .shutdown = swap_shutdown, |
0faacd47 | 1626 | .supported = swap_supported, |
c6918296 MS |
1627 | |
1628 | .status_message_formats = { | |
1629 | .starting_stopping = { | |
1630 | [0] = "Activating swap %s...", | |
1631 | [1] = "Deactivating swap %s...", | |
1632 | }, | |
1633 | .finished_start_job = { | |
1634 | [JOB_DONE] = "Activated swap %s.", | |
1635 | [JOB_FAILED] = "Failed to activate swap %s.", | |
c6918296 MS |
1636 | [JOB_TIMEOUT] = "Timed out activating swap %s.", |
1637 | }, | |
1638 | .finished_stop_job = { | |
1639 | [JOB_DONE] = "Deactivated swap %s.", | |
1640 | [JOB_FAILED] = "Failed deactivating swap %s.", | |
1641 | [JOB_TIMEOUT] = "Timed out deactivating swap %s.", | |
1642 | }, | |
1643 | }, | |
9727f242 | 1644 | |
705578c3 | 1645 | .can_start = swap_can_start, |
b2bfd121 LP |
1646 | |
1647 | .notify_plymouth = true, | |
07b0b134 | 1648 | }; |