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d6c9574f | 1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
07b0b134 ML |
2 | |
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2010 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
9 | under the terms of the GNU Lesser General Public License as published by |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
07b0b134 ML |
11 | (at your option) any later version. |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 16 | Lesser General Public License for more details. |
07b0b134 | 17 | |
5430f7f2 | 18 | You should have received a copy of the GNU Lesser General Public License |
07b0b134 ML |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
20 | ***/ | |
21 | ||
22 | #include <errno.h> | |
23 | #include <limits.h> | |
24 | #include <unistd.h> | |
25 | #include <fcntl.h> | |
26 | #include <sys/epoll.h> | |
27 | #include <sys/stat.h> | |
28 | #include <sys/swap.h> | |
e04aad61 | 29 | #include <libudev.h> |
07b0b134 ML |
30 | |
31 | #include "unit.h" | |
32 | #include "swap.h" | |
33 | #include "load-fragment.h" | |
34 | #include "load-dropin.h" | |
35 | #include "unit-name.h" | |
36 | #include "dbus-swap.h" | |
514f4ef5 | 37 | #include "special.h" |
8a0867d6 | 38 | #include "bus-errors.h" |
9a57c629 | 39 | #include "exit-status.h" |
f6a6225e | 40 | #include "def.h" |
9eb977db | 41 | #include "path-util.h" |
a5c3034f | 42 | #include "virt.h" |
5bcb0f2b | 43 | #include "udev-util.h" |
07b0b134 ML |
44 | |
45 | static const UnitActiveState state_translation_table[_SWAP_STATE_MAX] = { | |
46 | [SWAP_DEAD] = UNIT_INACTIVE, | |
e04aad61 | 47 | [SWAP_ACTIVATING] = UNIT_ACTIVATING, |
5bcb0f2b | 48 | [SWAP_ACTIVATING_DONE] = UNIT_ACTIVE, |
07b0b134 | 49 | [SWAP_ACTIVE] = UNIT_ACTIVE, |
e04aad61 LP |
50 | [SWAP_DEACTIVATING] = UNIT_DEACTIVATING, |
51 | [SWAP_ACTIVATING_SIGTERM] = UNIT_DEACTIVATING, | |
52 | [SWAP_ACTIVATING_SIGKILL] = UNIT_DEACTIVATING, | |
53 | [SWAP_DEACTIVATING_SIGTERM] = UNIT_DEACTIVATING, | |
54 | [SWAP_DEACTIVATING_SIGKILL] = UNIT_DEACTIVATING, | |
fdf20a31 | 55 | [SWAP_FAILED] = UNIT_FAILED |
07b0b134 ML |
56 | }; |
57 | ||
718db961 LP |
58 | static int swap_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata); |
59 | static int swap_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata); | |
60 | ||
e04aad61 | 61 | static void swap_unset_proc_swaps(Swap *s) { |
9670d583 LP |
62 | assert(s); |
63 | ||
64 | if (!s->from_proc_swaps) | |
65 | return; | |
66 | ||
67 | free(s->parameters_proc_swaps.what); | |
68 | s->parameters_proc_swaps.what = NULL; | |
69 | ||
70 | s->from_proc_swaps = false; | |
71 | } | |
72 | ||
73 | static int swap_set_devnode(Swap *s, const char *devnode) { | |
df326b84 | 74 | Hashmap *swaps; |
5bcb0f2b | 75 | Swap *first; |
9670d583 | 76 | int r; |
e04aad61 LP |
77 | |
78 | assert(s); | |
79 | ||
d5099efc | 80 | r = hashmap_ensure_allocated(&UNIT(s)->manager->swaps_by_devnode, &string_hash_ops); |
9670d583 LP |
81 | if (r < 0) |
82 | return r; | |
e04aad61 | 83 | |
9670d583 | 84 | swaps = UNIT(s)->manager->swaps_by_devnode; |
e04aad61 | 85 | |
9670d583 LP |
86 | if (s->devnode) { |
87 | first = hashmap_get(swaps, s->devnode); | |
e04aad61 | 88 | |
9670d583 LP |
89 | LIST_REMOVE(same_devnode, first, s); |
90 | if (first) | |
91 | hashmap_replace(swaps, first->devnode, first); | |
92 | else | |
93 | hashmap_remove(swaps, s->devnode); | |
5bcb0f2b | 94 | |
9670d583 LP |
95 | free(s->devnode); |
96 | s->devnode = NULL; | |
97 | } | |
98 | ||
99 | if (devnode) { | |
100 | s->devnode = strdup(devnode); | |
101 | if (!s->devnode) | |
102 | return -ENOMEM; | |
103 | ||
104 | first = hashmap_get(swaps, s->devnode); | |
105 | LIST_PREPEND(same_devnode, first, s); | |
106 | ||
107 | return hashmap_replace(swaps, first->devnode, first); | |
108 | } | |
109 | ||
110 | return 0; | |
e04aad61 LP |
111 | } |
112 | ||
f6cebb3b | 113 | static void swap_init(Unit *u) { |
6e620bec LP |
114 | Swap *s = SWAP(u); |
115 | ||
116 | assert(s); | |
1124fe6f | 117 | assert(UNIT(s)->load_state == UNIT_STUB); |
6e620bec | 118 | |
1f19a534 | 119 | s->timeout_usec = u->manager->default_timeout_start_usec; |
e04aad61 | 120 | |
ac155bb8 MS |
121 | s->exec_context.std_output = u->manager->default_std_output; |
122 | s->exec_context.std_error = u->manager->default_std_error; | |
085afe36 | 123 | |
6b1dc2bd | 124 | s->parameters_proc_swaps.priority = s->parameters_fragment.priority = -1; |
e04aad61 | 125 | |
e1770af8 | 126 | s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; |
c8f4d764 | 127 | |
5bcb0f2b | 128 | u->ignore_on_isolate = true; |
e04aad61 LP |
129 | } |
130 | ||
131 | static void swap_unwatch_control_pid(Swap *s) { | |
132 | assert(s); | |
133 | ||
134 | if (s->control_pid <= 0) | |
135 | return; | |
136 | ||
137 | unit_unwatch_pid(UNIT(s), s->control_pid); | |
138 | s->control_pid = 0; | |
6e620bec LP |
139 | } |
140 | ||
4e85aff4 LP |
141 | static void swap_done(Unit *u) { |
142 | Swap *s = SWAP(u); | |
07b0b134 | 143 | |
4e85aff4 | 144 | assert(s); |
07b0b134 | 145 | |
e04aad61 | 146 | swap_unset_proc_swaps(s); |
9670d583 | 147 | swap_set_devnode(s, NULL); |
e04aad61 | 148 | |
4e85aff4 | 149 | free(s->what); |
e04aad61 LP |
150 | s->what = NULL; |
151 | ||
4e85aff4 | 152 | free(s->parameters_fragment.what); |
6b1dc2bd | 153 | s->parameters_fragment.what = NULL; |
e04aad61 | 154 | |
86b23b07 JS |
155 | free(s->parameters_fragment.discard); |
156 | s->parameters_fragment.discard = NULL; | |
157 | ||
613b411c | 158 | s->exec_runtime = exec_runtime_unref(s->exec_runtime); |
e04aad61 LP |
159 | exec_command_done_array(s->exec_command, _SWAP_EXEC_COMMAND_MAX); |
160 | s->control_command = NULL; | |
161 | ||
162 | swap_unwatch_control_pid(s); | |
163 | ||
718db961 LP |
164 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
165 | } | |
166 | ||
167 | static int swap_arm_timer(Swap *s) { | |
168 | int r; | |
169 | ||
170 | assert(s); | |
171 | ||
172 | if (s->timeout_usec <= 0) { | |
173 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); | |
174 | return 0; | |
175 | } | |
176 | ||
177 | if (s->timer_event_source) { | |
178 | r = sd_event_source_set_time(s->timer_event_source, now(CLOCK_MONOTONIC) + s->timeout_usec); | |
179 | if (r < 0) | |
180 | return r; | |
181 | ||
182 | return sd_event_source_set_enabled(s->timer_event_source, SD_EVENT_ONESHOT); | |
183 | } | |
184 | ||
6a0f1f6d LP |
185 | return sd_event_add_time( |
186 | UNIT(s)->manager->event, | |
187 | &s->timer_event_source, | |
188 | CLOCK_MONOTONIC, | |
189 | now(CLOCK_MONOTONIC) + s->timeout_usec, 0, | |
190 | swap_dispatch_timer, s); | |
07b0b134 ML |
191 | } |
192 | ||
173a8d04 LP |
193 | static int swap_add_device_links(Swap *s) { |
194 | SwapParameters *p; | |
195 | ||
196 | assert(s); | |
197 | ||
198 | if (!s->what) | |
199 | return 0; | |
200 | ||
201 | if (s->from_fragment) | |
202 | p = &s->parameters_fragment; | |
173a8d04 LP |
203 | else |
204 | return 0; | |
205 | ||
cfcfd4ae | 206 | if (is_device_path(s->what)) |
5bcb0f2b | 207 | return unit_add_node_link(UNIT(s), s->what, !p->noauto && UNIT(s)->manager->running_as == SYSTEMD_SYSTEM); |
cfcfd4ae LP |
208 | else |
209 | /* File based swap devices need to be ordered after | |
2b93b027 | 210 | * systemd-remount-fs.service, since they might need a |
cfcfd4ae | 211 | * writable file system. */ |
2b93b027 | 212 | return unit_add_dependency_by_name(UNIT(s), UNIT_AFTER, SPECIAL_REMOUNT_FS_SERVICE, NULL, true); |
173a8d04 LP |
213 | } |
214 | ||
2edd4434 | 215 | static int swap_add_default_dependencies(Swap *s) { |
3018d312 | 216 | bool nofail, noauto; |
2edd4434 LP |
217 | int r; |
218 | ||
219 | assert(s); | |
220 | ||
67445f4e | 221 | if (UNIT(s)->manager->running_as != SYSTEMD_SYSTEM) |
6b1dc2bd | 222 | return 0; |
2edd4434 | 223 | |
c0387ebf LP |
224 | if (detect_container(NULL) > 0) |
225 | return 0; | |
226 | ||
6b1dc2bd LP |
227 | r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true); |
228 | if (r < 0) | |
229 | return r; | |
2edd4434 | 230 | |
3018d312 ZJS |
231 | if (!s->from_fragment) |
232 | /* The swap unit can either be for an alternative device name, in which | |
233 | * case we don't need to add the dependency on swap.target because this unit | |
234 | * is following a different unit which will have this dependency added, | |
235 | * or it can be derived from /proc/swaps, in which case it was started | |
236 | * manually, and should not become a dependency of swap.target. */ | |
237 | return 0; | |
64347fc2 | 238 | |
3018d312 ZJS |
239 | nofail = s->parameters_fragment.nofail; |
240 | noauto = s->parameters_fragment.noauto; | |
64347fc2 TG |
241 | |
242 | if (!noauto) { | |
4e82fe52 | 243 | if (nofail) |
5bcb0f2b | 244 | r = unit_add_dependency_by_name_inverse(UNIT(s), UNIT_WANTS, SPECIAL_SWAP_TARGET, NULL, true); |
4e82fe52 | 245 | else |
5bcb0f2b | 246 | r = unit_add_two_dependencies_by_name_inverse(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SWAP_TARGET, NULL, true); |
64347fc2 TG |
247 | } |
248 | ||
3018d312 | 249 | return r < 0 ? r : 0; |
2edd4434 LP |
250 | } |
251 | ||
4e85aff4 LP |
252 | static int swap_verify(Swap *s) { |
253 | bool b; | |
7fd1b19b | 254 | _cleanup_free_ char *e = NULL; |
4e85aff4 | 255 | |
1124fe6f | 256 | if (UNIT(s)->load_state != UNIT_LOADED) |
5bcb0f2b | 257 | return 0; |
4e85aff4 | 258 | |
170ca19e | 259 | e = unit_name_from_path(s->what, ".swap"); |
5bcb0f2b | 260 | if (!e) |
170ca19e | 261 | return log_oom(); |
4e85aff4 LP |
262 | |
263 | b = unit_has_name(UNIT(s), e); | |
4e85aff4 | 264 | if (!b) { |
5bcb0f2b | 265 | log_error_unit(UNIT(s)->id, "%s: Value of \"What\" and unit name do not match, not loading.", UNIT(s)->id); |
4e85aff4 LP |
266 | return -EINVAL; |
267 | } | |
268 | ||
4819ff03 | 269 | if (s->exec_context.pam_name && s->kill_context.kill_mode != KILL_CONTROL_GROUP) { |
5bcb0f2b | 270 | log_error_unit(UNIT(s)->id, "%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing to load.", UNIT(s)->id); |
e04aad61 LP |
271 | return -EINVAL; |
272 | } | |
273 | ||
4e85aff4 LP |
274 | return 0; |
275 | } | |
276 | ||
9670d583 LP |
277 | static int swap_load_devnode(Swap *s) { |
278 | _cleanup_udev_device_unref_ struct udev_device *d = NULL; | |
279 | struct stat st; | |
280 | const char *p; | |
281 | ||
282 | assert(s); | |
283 | ||
284 | if (stat(s->what, &st) < 0 || !S_ISBLK(st.st_mode)) | |
285 | return 0; | |
286 | ||
287 | d = udev_device_new_from_devnum(UNIT(s)->manager->udev, 'b', st.st_rdev); | |
288 | if (!d) | |
289 | return 0; | |
290 | ||
291 | p = udev_device_get_devnode(d); | |
292 | if (!p) | |
293 | return 0; | |
294 | ||
295 | return swap_set_devnode(s, p); | |
296 | } | |
297 | ||
07b0b134 ML |
298 | static int swap_load(Unit *u) { |
299 | int r; | |
300 | Swap *s = SWAP(u); | |
301 | ||
302 | assert(s); | |
ac155bb8 | 303 | assert(u->load_state == UNIT_STUB); |
07b0b134 ML |
304 | |
305 | /* Load a .swap file */ | |
646134dc ZJS |
306 | r = unit_load_fragment_and_dropin_optional(u); |
307 | if (r < 0) | |
07b0b134 ML |
308 | return r; |
309 | ||
ac155bb8 | 310 | if (u->load_state == UNIT_LOADED) { |
4e85aff4 | 311 | |
1124fe6f | 312 | if (UNIT(s)->fragment_path) |
4e85aff4 LP |
313 | s->from_fragment = true; |
314 | ||
315 | if (!s->what) { | |
316 | if (s->parameters_fragment.what) | |
317 | s->what = strdup(s->parameters_fragment.what); | |
4e85aff4 LP |
318 | else if (s->parameters_proc_swaps.what) |
319 | s->what = strdup(s->parameters_proc_swaps.what); | |
320 | else | |
ac155bb8 | 321 | s->what = unit_name_to_path(u->id); |
4e85aff4 LP |
322 | |
323 | if (!s->what) | |
07b0b134 | 324 | return -ENOMEM; |
4e85aff4 | 325 | } |
07b0b134 ML |
326 | |
327 | path_kill_slashes(s->what); | |
328 | ||
5bcb0f2b LP |
329 | if (!UNIT(s)->description) { |
330 | r = unit_set_description(u, s->what); | |
331 | if (r < 0) | |
4e85aff4 | 332 | return r; |
5bcb0f2b | 333 | } |
4e85aff4 | 334 | |
a57f7e2c | 335 | r = unit_require_mounts_for(UNIT(s), s->what); |
646134dc | 336 | if (r < 0) |
07b0b134 ML |
337 | return r; |
338 | ||
a57f7e2c | 339 | r = swap_add_device_links(s); |
646134dc | 340 | if (r < 0) |
6e2ef85b | 341 | return r; |
07b0b134 | 342 | |
9670d583 LP |
343 | r = swap_load_devnode(s); |
344 | if (r < 0) | |
345 | return r; | |
346 | ||
598459ce LP |
347 | r = unit_patch_contexts(u); |
348 | if (r < 0) | |
349 | return r; | |
350 | ||
351 | r = unit_add_exec_dependencies(u, &s->exec_context); | |
352 | if (r < 0) | |
353 | return r; | |
354 | ||
355 | r = unit_add_default_slice(u, &s->cgroup_context); | |
a016b922 LP |
356 | if (r < 0) |
357 | return r; | |
358 | ||
646134dc ZJS |
359 | if (UNIT(s)->default_dependencies) { |
360 | r = swap_add_default_dependencies(s); | |
361 | if (r < 0) | |
2edd4434 | 362 | return r; |
646134dc | 363 | } |
07b0b134 ML |
364 | } |
365 | ||
366 | return swap_verify(s); | |
367 | } | |
368 | ||
6b1dc2bd | 369 | static int swap_add_one( |
4e85aff4 LP |
370 | Manager *m, |
371 | const char *what, | |
e04aad61 | 372 | const char *what_proc_swaps, |
4e85aff4 LP |
373 | int priority, |
374 | bool noauto, | |
173a8d04 | 375 | bool nofail, |
e04aad61 LP |
376 | bool set_flags) { |
377 | ||
7fd1b19b | 378 | _cleanup_free_ char *e = NULL; |
2c7c6144 | 379 | bool delete = false; |
5bcb0f2b | 380 | Unit *u = NULL; |
07b0b134 | 381 | int r; |
4e85aff4 LP |
382 | SwapParameters *p; |
383 | ||
384 | assert(m); | |
385 | assert(what); | |
6b1dc2bd | 386 | assert(what_proc_swaps); |
07b0b134 | 387 | |
7d17cfbc MS |
388 | e = unit_name_from_path(what, ".swap"); |
389 | if (!e) | |
170ca19e | 390 | return log_oom(); |
07b0b134 | 391 | |
e04aad61 LP |
392 | u = manager_get_unit(m, e); |
393 | ||
6b1dc2bd | 394 | if (u && |
e04aad61 LP |
395 | SWAP(u)->from_proc_swaps && |
396 | !path_equal(SWAP(u)->parameters_proc_swaps.what, what_proc_swaps)) | |
397 | return -EEXIST; | |
4e85aff4 LP |
398 | |
399 | if (!u) { | |
07b0b134 ML |
400 | delete = true; |
401 | ||
7d17cfbc | 402 | u = unit_new(m, sizeof(Swap)); |
170ca19e ZJS |
403 | if (!u) |
404 | return log_oom(); | |
e04aad61 | 405 | |
7d17cfbc MS |
406 | r = unit_add_name(u, e); |
407 | if (r < 0) | |
e04aad61 LP |
408 | goto fail; |
409 | ||
7d17cfbc MS |
410 | SWAP(u)->what = strdup(what); |
411 | if (!SWAP(u)->what) { | |
646134dc | 412 | r = log_oom(); |
e04aad61 LP |
413 | goto fail; |
414 | } | |
415 | ||
416 | unit_add_to_load_queue(u); | |
4e85aff4 LP |
417 | } else |
418 | delete = false; | |
07b0b134 | 419 | |
6b1dc2bd | 420 | p = &SWAP(u)->parameters_proc_swaps; |
07b0b134 | 421 | |
6b1dc2bd | 422 | if (!p->what) { |
5bcb0f2b LP |
423 | p->what = strdup(what_proc_swaps); |
424 | if (!p->what) { | |
425 | r = -ENOMEM; | |
6b1dc2bd LP |
426 | goto fail; |
427 | } | |
6b1dc2bd | 428 | } |
e04aad61 | 429 | |
6b1dc2bd LP |
430 | if (set_flags) { |
431 | SWAP(u)->is_active = true; | |
432 | SWAP(u)->just_activated = !SWAP(u)->from_proc_swaps; | |
4e85aff4 | 433 | } |
07b0b134 | 434 | |
6b1dc2bd LP |
435 | SWAP(u)->from_proc_swaps = true; |
436 | ||
4e85aff4 LP |
437 | p->priority = priority; |
438 | p->noauto = noauto; | |
173a8d04 | 439 | p->nofail = nofail; |
07b0b134 | 440 | |
4e85aff4 | 441 | unit_add_to_dbus_queue(u); |
07b0b134 | 442 | |
07b0b134 ML |
443 | return 0; |
444 | ||
445 | fail: | |
66870f90 | 446 | log_warning_unit(e, "Failed to load swap unit: %s", strerror(-r)); |
e04aad61 | 447 | |
4e85aff4 | 448 | if (delete && u) |
07b0b134 ML |
449 | unit_free(u); |
450 | ||
4e85aff4 | 451 | return r; |
07b0b134 ML |
452 | } |
453 | ||
e04aad61 | 454 | static int swap_process_new_swap(Manager *m, const char *device, int prio, bool set_flags) { |
5bcb0f2b LP |
455 | _cleanup_udev_device_unref_ struct udev_device *d = NULL; |
456 | struct udev_list_entry *item = NULL, *first = NULL; | |
457 | const char *dn; | |
e04aad61 | 458 | struct stat st; |
5bcb0f2b | 459 | int r; |
e04aad61 LP |
460 | |
461 | assert(m); | |
462 | ||
5bcb0f2b LP |
463 | r = swap_add_one(m, device, device, prio, false, false, set_flags); |
464 | if (r < 0) | |
465 | return r; | |
e04aad61 | 466 | |
5bcb0f2b LP |
467 | /* If this is a block device, then let's add duplicates for |
468 | * all other names of this block device */ | |
469 | if (stat(device, &st) < 0 || !S_ISBLK(st.st_mode)) | |
470 | return 0; | |
e04aad61 | 471 | |
5bcb0f2b LP |
472 | d = udev_device_new_from_devnum(m->udev, 'b', st.st_rdev); |
473 | if (!d) | |
474 | return 0; | |
e04aad61 | 475 | |
5bcb0f2b LP |
476 | /* Add the main device node */ |
477 | dn = udev_device_get_devnode(d); | |
478 | if (dn && !streq(dn, device)) | |
479 | swap_add_one(m, dn, device, prio, false, false, set_flags); | |
e04aad61 | 480 | |
5bcb0f2b LP |
481 | /* Add additional units for all symlinks */ |
482 | first = udev_device_get_devlinks_list_entry(d); | |
483 | udev_list_entry_foreach(item, first) { | |
484 | const char *p; | |
e04aad61 | 485 | |
5bcb0f2b LP |
486 | /* Don't bother with the /dev/block links */ |
487 | p = udev_list_entry_get_name(item); | |
e04aad61 | 488 | |
5bcb0f2b LP |
489 | if (streq(p, device)) |
490 | continue; | |
e04aad61 | 491 | |
5bcb0f2b LP |
492 | if (path_startswith(p, "/dev/block/")) |
493 | continue; | |
e04aad61 | 494 | |
5bcb0f2b LP |
495 | if (stat(p, &st) >= 0) |
496 | if (!S_ISBLK(st.st_mode) || | |
497 | st.st_rdev != udev_device_get_devnum(d)) | |
498 | continue; | |
e04aad61 | 499 | |
5bcb0f2b | 500 | swap_add_one(m, p, device, prio, false, false, set_flags); |
e04aad61 LP |
501 | } |
502 | ||
e04aad61 LP |
503 | return r; |
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 | ||
511 | old_state = s->state; | |
512 | s->state = state; | |
513 | ||
e04aad61 LP |
514 | if (state != SWAP_ACTIVATING && |
515 | state != SWAP_ACTIVATING_SIGTERM && | |
516 | state != SWAP_ACTIVATING_SIGKILL && | |
5bcb0f2b | 517 | state != SWAP_ACTIVATING_DONE && |
e04aad61 LP |
518 | state != SWAP_DEACTIVATING && |
519 | state != SWAP_DEACTIVATING_SIGTERM && | |
520 | state != SWAP_DEACTIVATING_SIGKILL) { | |
718db961 | 521 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
e04aad61 LP |
522 | swap_unwatch_control_pid(s); |
523 | s->control_command = NULL; | |
524 | s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; | |
525 | } | |
526 | ||
07b0b134 | 527 | if (state != old_state) |
66870f90 ZJS |
528 | log_debug_unit(UNIT(s)->id, |
529 | "%s changed %s -> %s", | |
530 | UNIT(s)->id, | |
531 | swap_state_to_string(old_state), | |
532 | swap_state_to_string(state)); | |
07b0b134 | 533 | |
5bcb0f2b | 534 | unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], true); |
07b0b134 ML |
535 | } |
536 | ||
537 | static int swap_coldplug(Unit *u) { | |
538 | Swap *s = SWAP(u); | |
539 | SwapState new_state = SWAP_DEAD; | |
e04aad61 | 540 | int r; |
07b0b134 ML |
541 | |
542 | assert(s); | |
543 | assert(s->state == SWAP_DEAD); | |
544 | ||
545 | if (s->deserialized_state != s->state) | |
546 | new_state = s->deserialized_state; | |
4e85aff4 | 547 | else if (s->from_proc_swaps) |
07b0b134 ML |
548 | new_state = SWAP_ACTIVE; |
549 | ||
5bcb0f2b LP |
550 | if (new_state == s->state) |
551 | return 0; | |
e04aad61 | 552 | |
5bcb0f2b LP |
553 | if (new_state == SWAP_ACTIVATING || |
554 | new_state == SWAP_ACTIVATING_SIGTERM || | |
555 | new_state == SWAP_ACTIVATING_SIGKILL || | |
556 | new_state == SWAP_ACTIVATING_DONE || | |
557 | new_state == SWAP_DEACTIVATING || | |
558 | new_state == SWAP_DEACTIVATING_SIGTERM || | |
559 | new_state == SWAP_DEACTIVATING_SIGKILL) { | |
e04aad61 | 560 | |
5bcb0f2b LP |
561 | if (s->control_pid <= 0) |
562 | return -EBADMSG; | |
e04aad61 | 563 | |
5bcb0f2b LP |
564 | r = unit_watch_pid(UNIT(s), s->control_pid); |
565 | if (r < 0) | |
566 | return r; | |
e04aad61 | 567 | |
5bcb0f2b LP |
568 | r = swap_arm_timer(s); |
569 | if (r < 0) | |
570 | return r; | |
e04aad61 | 571 | } |
07b0b134 | 572 | |
5bcb0f2b | 573 | swap_set_state(s, new_state); |
07b0b134 ML |
574 | return 0; |
575 | } | |
576 | ||
577 | static void swap_dump(Unit *u, FILE *f, const char *prefix) { | |
578 | Swap *s = SWAP(u); | |
4e85aff4 | 579 | SwapParameters *p; |
07b0b134 ML |
580 | |
581 | assert(s); | |
4e85aff4 LP |
582 | assert(f); |
583 | ||
584 | if (s->from_proc_swaps) | |
585 | p = &s->parameters_proc_swaps; | |
586 | else if (s->from_fragment) | |
587 | p = &s->parameters_fragment; | |
b6bfc7bb LP |
588 | else |
589 | p = NULL; | |
07b0b134 ML |
590 | |
591 | fprintf(f, | |
4e85aff4 | 592 | "%sSwap State: %s\n" |
e1770af8 | 593 | "%sResult: %s\n" |
07b0b134 | 594 | "%sWhat: %s\n" |
4e85aff4 LP |
595 | "%sFrom /proc/swaps: %s\n" |
596 | "%sFrom fragment: %s\n", | |
07b0b134 | 597 | prefix, swap_state_to_string(s->state), |
e1770af8 | 598 | prefix, swap_result_to_string(s->result), |
07b0b134 | 599 | prefix, s->what, |
4e85aff4 LP |
600 | prefix, yes_no(s->from_proc_swaps), |
601 | prefix, yes_no(s->from_fragment)); | |
e04aad61 | 602 | |
9670d583 LP |
603 | if (s->devnode) |
604 | fprintf(f, "%sDevice Node: %s\n", prefix, s->devnode); | |
605 | ||
b6bfc7bb LP |
606 | if (p) |
607 | fprintf(f, | |
608 | "%sPriority: %i\n" | |
609 | "%sNoAuto: %s\n" | |
86b23b07 JS |
610 | "%sNoFail: %s\n" |
611 | "%sDiscard: %s\n", | |
b6bfc7bb LP |
612 | prefix, p->priority, |
613 | prefix, yes_no(p->noauto), | |
86b23b07 | 614 | prefix, yes_no(p->nofail), |
4f52d3fe | 615 | prefix, p->discard ?: "none"); |
b6bfc7bb | 616 | |
e04aad61 LP |
617 | if (s->control_pid > 0) |
618 | fprintf(f, | |
de0671ee ZJS |
619 | "%sControl PID: "PID_FMT"\n", |
620 | prefix, s->control_pid); | |
e04aad61 LP |
621 | |
622 | exec_context_dump(&s->exec_context, f, prefix); | |
4819ff03 | 623 | kill_context_dump(&s->kill_context, f, prefix); |
e04aad61 LP |
624 | } |
625 | ||
626 | static int swap_spawn(Swap *s, ExecCommand *c, pid_t *_pid) { | |
627 | pid_t pid; | |
628 | int r; | |
9fa95f85 DM |
629 | ExecParameters exec_params = { |
630 | .apply_permissions = true, | |
631 | .apply_chroot = true, | |
632 | .apply_tty_stdin = true, | |
633 | }; | |
e04aad61 LP |
634 | |
635 | assert(s); | |
636 | assert(c); | |
637 | assert(_pid); | |
638 | ||
4ad49000 LP |
639 | unit_realize_cgroup(UNIT(s)); |
640 | ||
613b411c LP |
641 | r = unit_setup_exec_runtime(UNIT(s)); |
642 | if (r < 0) | |
643 | goto fail; | |
644 | ||
718db961 | 645 | r = swap_arm_timer(s); |
646134dc | 646 | if (r < 0) |
e04aad61 LP |
647 | goto fail; |
648 | ||
9fa95f85 DM |
649 | exec_params.environment = UNIT(s)->manager->environment; |
650 | exec_params.confirm_spawn = UNIT(s)->manager->confirm_spawn; | |
651 | exec_params.cgroup_supported = UNIT(s)->manager->cgroup_supported; | |
652 | exec_params.cgroup_path = UNIT(s)->cgroup_path; | |
653 | exec_params.runtime_prefix = manager_get_runtime_prefix(UNIT(s)->manager); | |
654 | exec_params.unit_id = UNIT(s)->id; | |
655 | ||
646134dc | 656 | r = exec_spawn(c, |
646134dc | 657 | &s->exec_context, |
9fa95f85 | 658 | &exec_params, |
613b411c | 659 | s->exec_runtime, |
646134dc ZJS |
660 | &pid); |
661 | if (r < 0) | |
e04aad61 LP |
662 | goto fail; |
663 | ||
646134dc ZJS |
664 | r = unit_watch_pid(UNIT(s), pid); |
665 | if (r < 0) | |
e04aad61 LP |
666 | /* FIXME: we need to do something here */ |
667 | goto fail; | |
668 | ||
669 | *_pid = pid; | |
670 | ||
671 | return 0; | |
672 | ||
673 | fail: | |
718db961 | 674 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
e04aad61 LP |
675 | |
676 | return r; | |
07b0b134 ML |
677 | } |
678 | ||
e1770af8 | 679 | static void swap_enter_dead(Swap *s, SwapResult f) { |
07b0b134 ML |
680 | assert(s); |
681 | ||
e1770af8 LP |
682 | if (f != SWAP_SUCCESS) |
683 | s->result = f; | |
e04aad61 | 684 | |
613b411c LP |
685 | exec_runtime_destroy(s->exec_runtime); |
686 | s->exec_runtime = exec_runtime_unref(s->exec_runtime); | |
687 | ||
e66cf1a3 LP |
688 | exec_context_destroy_runtime_directory(&s->exec_context, manager_get_runtime_prefix(UNIT(s)->manager)); |
689 | ||
e1770af8 | 690 | swap_set_state(s, s->result != SWAP_SUCCESS ? SWAP_FAILED : SWAP_DEAD); |
07b0b134 ML |
691 | } |
692 | ||
e1770af8 | 693 | static void swap_enter_active(Swap *s, SwapResult f) { |
e04aad61 LP |
694 | assert(s); |
695 | ||
e1770af8 LP |
696 | if (f != SWAP_SUCCESS) |
697 | s->result = f; | |
e04aad61 LP |
698 | |
699 | swap_set_state(s, SWAP_ACTIVE); | |
700 | } | |
701 | ||
e1770af8 | 702 | static void swap_enter_signal(Swap *s, SwapState state, SwapResult f) { |
07b0b134 ML |
703 | int r; |
704 | ||
705 | assert(s); | |
e04aad61 | 706 | |
e1770af8 LP |
707 | if (f != SWAP_SUCCESS) |
708 | s->result = f; | |
e04aad61 | 709 | |
cd2086fe LP |
710 | r = unit_kill_context( |
711 | UNIT(s), | |
712 | &s->kill_context, | |
713 | state != SWAP_ACTIVATING_SIGTERM && state != SWAP_DEACTIVATING_SIGTERM, | |
714 | -1, | |
715 | s->control_pid, | |
716 | false); | |
717 | if (r < 0) | |
718 | goto fail; | |
e04aad61 | 719 | |
cd2086fe | 720 | if (r > 0) { |
718db961 | 721 | r = swap_arm_timer(s); |
646134dc | 722 | if (r < 0) |
e04aad61 LP |
723 | goto fail; |
724 | ||
725 | swap_set_state(s, state); | |
ac84d1fb LP |
726 | } else if (state == SWAP_ACTIVATING_SIGTERM) |
727 | swap_enter_signal(s, SWAP_ACTIVATING_SIGKILL, SWAP_SUCCESS); | |
728 | else if (state == SWAP_DEACTIVATING_SIGTERM) | |
729 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, SWAP_SUCCESS); | |
730 | else | |
e1770af8 | 731 | swap_enter_dead(s, SWAP_SUCCESS); |
e04aad61 LP |
732 | |
733 | return; | |
734 | ||
735 | fail: | |
66870f90 ZJS |
736 | log_warning_unit(UNIT(s)->id, |
737 | "%s failed to kill processes: %s", UNIT(s)->id, strerror(-r)); | |
e04aad61 | 738 | |
e1770af8 | 739 | swap_enter_dead(s, SWAP_FAILURE_RESOURCES); |
e04aad61 LP |
740 | } |
741 | ||
742 | static void swap_enter_activating(Swap *s) { | |
743 | int r, priority; | |
86b23b07 | 744 | char *discard; |
e04aad61 LP |
745 | |
746 | assert(s); | |
747 | ||
748 | s->control_command_id = SWAP_EXEC_ACTIVATE; | |
749 | s->control_command = s->exec_command + SWAP_EXEC_ACTIVATE; | |
07b0b134 | 750 | |
86b23b07 | 751 | if (s->from_fragment) { |
4e85aff4 | 752 | priority = s->parameters_fragment.priority; |
86b23b07 JS |
753 | discard = s->parameters_fragment.discard; |
754 | } else { | |
e04aad61 | 755 | priority = -1; |
86b23b07 JS |
756 | discard = NULL; |
757 | } | |
758 | ||
759 | r = exec_command_set(s->control_command, "/sbin/swapon", NULL); | |
760 | if (r < 0) | |
761 | goto fail; | |
4e85aff4 | 762 | |
e04aad61 | 763 | if (priority >= 0) { |
5bcb0f2b | 764 | char p[DECIMAL_STR_MAX(int)]; |
07b0b134 | 765 | |
5bcb0f2b | 766 | sprintf(p, "%i", priority); |
86b23b07 JS |
767 | r = exec_command_append(s->control_command, "-p", p, NULL); |
768 | if (r < 0) | |
769 | goto fail; | |
770 | } | |
07b0b134 | 771 | |
86b23b07 JS |
772 | if (discard && !streq(discard, "none")) { |
773 | const char *discard_arg = "--discard"; | |
774 | ||
775 | if (!streq(discard, "all")) | |
776 | discard_arg = strappenda("--discard=", discard); | |
777 | ||
778 | r = exec_command_append(s->control_command, discard_arg, NULL); | |
779 | if (r < 0) | |
780 | goto fail; | |
781 | } | |
e04aad61 | 782 | |
86b23b07 | 783 | r = exec_command_append(s->control_command, s->what, NULL); |
e04aad61 LP |
784 | if (r < 0) |
785 | goto fail; | |
786 | ||
787 | swap_unwatch_control_pid(s); | |
788 | ||
646134dc ZJS |
789 | r = swap_spawn(s, s->control_command, &s->control_pid); |
790 | if (r < 0) | |
e04aad61 LP |
791 | goto fail; |
792 | ||
793 | swap_set_state(s, SWAP_ACTIVATING); | |
794 | ||
795 | return; | |
796 | ||
797 | fail: | |
66870f90 ZJS |
798 | log_warning_unit(UNIT(s)->id, |
799 | "%s failed to run 'swapon' task: %s", | |
800 | UNIT(s)->id, strerror(-r)); | |
e1770af8 | 801 | swap_enter_dead(s, SWAP_FAILURE_RESOURCES); |
e04aad61 LP |
802 | } |
803 | ||
e1770af8 | 804 | static void swap_enter_deactivating(Swap *s) { |
e04aad61 LP |
805 | int r; |
806 | ||
807 | assert(s); | |
808 | ||
e04aad61 LP |
809 | s->control_command_id = SWAP_EXEC_DEACTIVATE; |
810 | s->control_command = s->exec_command + SWAP_EXEC_DEACTIVATE; | |
811 | ||
646134dc | 812 | r = exec_command_set(s->control_command, |
e04aad61 LP |
813 | "/sbin/swapoff", |
814 | s->what, | |
646134dc ZJS |
815 | NULL); |
816 | if (r < 0) | |
e04aad61 LP |
817 | goto fail; |
818 | ||
819 | swap_unwatch_control_pid(s); | |
820 | ||
646134dc ZJS |
821 | r = swap_spawn(s, s->control_command, &s->control_pid); |
822 | if (r < 0) | |
e04aad61 LP |
823 | goto fail; |
824 | ||
825 | swap_set_state(s, SWAP_DEACTIVATING); | |
826 | ||
827 | return; | |
828 | ||
829 | fail: | |
66870f90 ZJS |
830 | log_warning_unit(UNIT(s)->id, |
831 | "%s failed to run 'swapoff' task: %s", | |
832 | UNIT(s)->id, strerror(-r)); | |
e1770af8 | 833 | swap_enter_active(s, SWAP_FAILURE_RESOURCES); |
e04aad61 LP |
834 | } |
835 | ||
836 | static int swap_start(Unit *u) { | |
837 | Swap *s = SWAP(u); | |
838 | ||
839 | assert(s); | |
840 | ||
841 | /* We cannot fulfill this request right now, try again later | |
842 | * please! */ | |
843 | ||
844 | if (s->state == SWAP_DEACTIVATING || | |
845 | s->state == SWAP_DEACTIVATING_SIGTERM || | |
846 | s->state == SWAP_DEACTIVATING_SIGKILL || | |
847 | s->state == SWAP_ACTIVATING_SIGTERM || | |
848 | s->state == SWAP_ACTIVATING_SIGKILL) | |
849 | return -EAGAIN; | |
850 | ||
851 | if (s->state == SWAP_ACTIVATING) | |
852 | return 0; | |
853 | ||
854 | assert(s->state == SWAP_DEAD || s->state == SWAP_FAILED); | |
855 | ||
a5c3034f LP |
856 | if (detect_container(NULL) > 0) |
857 | return -EPERM; | |
858 | ||
e1770af8 | 859 | s->result = SWAP_SUCCESS; |
e04aad61 | 860 | swap_enter_activating(s); |
07b0b134 ML |
861 | return 0; |
862 | } | |
863 | ||
864 | static int swap_stop(Unit *u) { | |
865 | Swap *s = SWAP(u); | |
07b0b134 ML |
866 | |
867 | assert(s); | |
868 | ||
e04aad61 LP |
869 | if (s->state == SWAP_DEACTIVATING || |
870 | s->state == SWAP_DEACTIVATING_SIGTERM || | |
871 | s->state == SWAP_DEACTIVATING_SIGKILL || | |
872 | s->state == SWAP_ACTIVATING_SIGTERM || | |
873 | s->state == SWAP_ACTIVATING_SIGKILL) | |
874 | return 0; | |
07b0b134 | 875 | |
e04aad61 | 876 | assert(s->state == SWAP_ACTIVATING || |
5bcb0f2b | 877 | s->state == SWAP_ACTIVATING_DONE || |
e04aad61 | 878 | s->state == SWAP_ACTIVE); |
07b0b134 | 879 | |
a5c3034f LP |
880 | if (detect_container(NULL) > 0) |
881 | return -EPERM; | |
882 | ||
e1770af8 | 883 | swap_enter_deactivating(s); |
07b0b134 ML |
884 | return 0; |
885 | } | |
886 | ||
887 | static int swap_serialize(Unit *u, FILE *f, FDSet *fds) { | |
888 | Swap *s = SWAP(u); | |
889 | ||
890 | assert(s); | |
891 | assert(f); | |
892 | assert(fds); | |
893 | ||
894 | unit_serialize_item(u, f, "state", swap_state_to_string(s->state)); | |
e1770af8 | 895 | unit_serialize_item(u, f, "result", swap_result_to_string(s->result)); |
e04aad61 LP |
896 | |
897 | if (s->control_pid > 0) | |
de0671ee | 898 | unit_serialize_item_format(u, f, "control-pid", PID_FMT, s->control_pid); |
e04aad61 LP |
899 | |
900 | if (s->control_command_id >= 0) | |
901 | unit_serialize_item(u, f, "control-command", swap_exec_command_to_string(s->control_command_id)); | |
07b0b134 ML |
902 | |
903 | return 0; | |
904 | } | |
905 | ||
906 | static int swap_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
907 | Swap *s = SWAP(u); | |
908 | ||
909 | assert(s); | |
910 | assert(fds); | |
911 | ||
912 | if (streq(key, "state")) { | |
913 | SwapState state; | |
914 | ||
646134dc ZJS |
915 | state = swap_state_from_string(value); |
916 | if (state < 0) | |
66870f90 | 917 | log_debug_unit(u->id, "Failed to parse state value %s", value); |
07b0b134 ML |
918 | else |
919 | s->deserialized_state = state; | |
e1770af8 LP |
920 | } else if (streq(key, "result")) { |
921 | SwapResult f; | |
922 | ||
923 | f = swap_result_from_string(value); | |
924 | if (f < 0) | |
66870f90 | 925 | log_debug_unit(u->id, "Failed to parse result value %s", value); |
e1770af8 LP |
926 | else if (f != SWAP_SUCCESS) |
927 | s->result = f; | |
e04aad61 LP |
928 | } else if (streq(key, "control-pid")) { |
929 | pid_t pid; | |
930 | ||
931 | if (parse_pid(value, &pid) < 0) | |
66870f90 | 932 | log_debug_unit(u->id, "Failed to parse control-pid value %s", value); |
e04aad61 LP |
933 | else |
934 | s->control_pid = pid; | |
935 | ||
936 | } else if (streq(key, "control-command")) { | |
937 | SwapExecCommand id; | |
938 | ||
646134dc ZJS |
939 | id = swap_exec_command_from_string(value); |
940 | if (id < 0) | |
66870f90 | 941 | log_debug_unit(u->id, "Failed to parse exec-command value %s", value); |
e04aad61 LP |
942 | else { |
943 | s->control_command_id = id; | |
944 | s->control_command = s->exec_command + id; | |
945 | } | |
07b0b134 | 946 | } else |
66870f90 | 947 | log_debug_unit(u->id, "Unknown serialization key '%s'", key); |
07b0b134 ML |
948 | |
949 | return 0; | |
950 | } | |
951 | ||
44a6b1b6 | 952 | _pure_ static UnitActiveState swap_active_state(Unit *u) { |
07b0b134 ML |
953 | assert(u); |
954 | ||
955 | return state_translation_table[SWAP(u)->state]; | |
956 | } | |
957 | ||
44a6b1b6 | 958 | _pure_ static const char *swap_sub_state_to_string(Unit *u) { |
07b0b134 ML |
959 | assert(u); |
960 | ||
961 | return swap_state_to_string(SWAP(u)->state); | |
962 | } | |
963 | ||
44a6b1b6 | 964 | _pure_ static bool swap_check_gc(Unit *u) { |
07b0b134 ML |
965 | Swap *s = SWAP(u); |
966 | ||
967 | assert(s); | |
968 | ||
6b1dc2bd | 969 | return s->from_proc_swaps; |
07b0b134 ML |
970 | } |
971 | ||
e04aad61 LP |
972 | static void swap_sigchld_event(Unit *u, pid_t pid, int code, int status) { |
973 | Swap *s = SWAP(u); | |
e1770af8 | 974 | SwapResult f; |
e04aad61 LP |
975 | |
976 | assert(s); | |
977 | assert(pid >= 0); | |
978 | ||
979 | if (pid != s->control_pid) | |
980 | return; | |
981 | ||
982 | s->control_pid = 0; | |
983 | ||
96342de6 | 984 | if (is_clean_exit(code, status, NULL)) |
e1770af8 LP |
985 | f = SWAP_SUCCESS; |
986 | else if (code == CLD_EXITED) | |
987 | f = SWAP_FAILURE_EXIT_CODE; | |
988 | else if (code == CLD_KILLED) | |
989 | f = SWAP_FAILURE_SIGNAL; | |
990 | else if (code == CLD_DUMPED) | |
991 | f = SWAP_FAILURE_CORE_DUMP; | |
992 | else | |
993 | assert_not_reached("Unknown code"); | |
994 | ||
995 | if (f != SWAP_SUCCESS) | |
996 | s->result = f; | |
e04aad61 LP |
997 | |
998 | if (s->control_command) { | |
6ea832a2 | 999 | exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status); |
e1770af8 | 1000 | |
e04aad61 LP |
1001 | s->control_command = NULL; |
1002 | s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; | |
1003 | } | |
1004 | ||
66870f90 ZJS |
1005 | log_full_unit(f == SWAP_SUCCESS ? LOG_DEBUG : LOG_NOTICE, |
1006 | u->id, | |
1007 | "%s swap process exited, code=%s status=%i", | |
1008 | u->id, sigchld_code_to_string(code), status); | |
e04aad61 LP |
1009 | |
1010 | switch (s->state) { | |
1011 | ||
1012 | case SWAP_ACTIVATING: | |
5bcb0f2b | 1013 | case SWAP_ACTIVATING_DONE: |
e04aad61 LP |
1014 | case SWAP_ACTIVATING_SIGTERM: |
1015 | case SWAP_ACTIVATING_SIGKILL: | |
1016 | ||
e1770af8 LP |
1017 | if (f == SWAP_SUCCESS) |
1018 | swap_enter_active(s, f); | |
e04aad61 | 1019 | else |
e1770af8 | 1020 | swap_enter_dead(s, f); |
e04aad61 LP |
1021 | break; |
1022 | ||
1023 | case SWAP_DEACTIVATING: | |
1024 | case SWAP_DEACTIVATING_SIGKILL: | |
1025 | case SWAP_DEACTIVATING_SIGTERM: | |
1026 | ||
7bb01eff | 1027 | swap_enter_dead(s, f); |
e04aad61 LP |
1028 | break; |
1029 | ||
1030 | default: | |
1031 | assert_not_reached("Uh, control process died at wrong time."); | |
1032 | } | |
1033 | ||
1034 | /* Notify clients about changed exit status */ | |
1035 | unit_add_to_dbus_queue(u); | |
e04aad61 LP |
1036 | } |
1037 | ||
718db961 LP |
1038 | static int swap_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) { |
1039 | Swap *s = SWAP(userdata); | |
e04aad61 LP |
1040 | |
1041 | assert(s); | |
718db961 | 1042 | assert(s->timer_event_source == source); |
e04aad61 LP |
1043 | |
1044 | switch (s->state) { | |
1045 | ||
1046 | case SWAP_ACTIVATING: | |
5bcb0f2b | 1047 | case SWAP_ACTIVATING_DONE: |
718db961 | 1048 | log_warning_unit(UNIT(s)->id, "%s activation timed out. Stopping.", UNIT(s)->id); |
e1770af8 | 1049 | swap_enter_signal(s, SWAP_ACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT); |
e04aad61 LP |
1050 | break; |
1051 | ||
1052 | case SWAP_DEACTIVATING: | |
718db961 | 1053 | log_warning_unit(UNIT(s)->id, "%s deactivation timed out. Stopping.", UNIT(s)->id); |
e1770af8 | 1054 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT); |
e04aad61 LP |
1055 | break; |
1056 | ||
1057 | case SWAP_ACTIVATING_SIGTERM: | |
4819ff03 | 1058 | if (s->kill_context.send_sigkill) { |
718db961 | 1059 | log_warning_unit(UNIT(s)->id, "%s activation timed out. Killing.", UNIT(s)->id); |
e1770af8 | 1060 | swap_enter_signal(s, SWAP_ACTIVATING_SIGKILL, SWAP_FAILURE_TIMEOUT); |
ba035df2 | 1061 | } else { |
718db961 | 1062 | log_warning_unit(UNIT(s)->id, "%s activation timed out. Skipping SIGKILL. Ignoring.", UNIT(s)->id); |
e1770af8 | 1063 | swap_enter_dead(s, SWAP_FAILURE_TIMEOUT); |
ba035df2 | 1064 | } |
e04aad61 LP |
1065 | break; |
1066 | ||
1067 | case SWAP_DEACTIVATING_SIGTERM: | |
4819ff03 | 1068 | if (s->kill_context.send_sigkill) { |
718db961 | 1069 | log_warning_unit(UNIT(s)->id, "%s deactivation timed out. Killing.", UNIT(s)->id); |
e1770af8 | 1070 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, SWAP_FAILURE_TIMEOUT); |
ba035df2 | 1071 | } else { |
718db961 | 1072 | log_warning_unit(UNIT(s)->id, "%s deactivation timed out. Skipping SIGKILL. Ignoring.", UNIT(s)->id); |
e1770af8 | 1073 | swap_enter_dead(s, SWAP_FAILURE_TIMEOUT); |
ba035df2 | 1074 | } |
e04aad61 LP |
1075 | break; |
1076 | ||
1077 | case SWAP_ACTIVATING_SIGKILL: | |
1078 | case SWAP_DEACTIVATING_SIGKILL: | |
718db961 | 1079 | log_warning_unit(UNIT(s)->id, "%s swap process still around after SIGKILL. Ignoring.", UNIT(s)->id); |
e1770af8 | 1080 | swap_enter_dead(s, SWAP_FAILURE_TIMEOUT); |
e04aad61 LP |
1081 | break; |
1082 | ||
1083 | default: | |
1084 | assert_not_reached("Timeout at wrong time."); | |
1085 | } | |
718db961 LP |
1086 | |
1087 | return 0; | |
e04aad61 LP |
1088 | } |
1089 | ||
1090 | static int swap_load_proc_swaps(Manager *m, bool set_flags) { | |
1091 | unsigned i; | |
1092 | int r = 0; | |
1093 | ||
1094 | assert(m); | |
1095 | ||
07b0b134 | 1096 | rewind(m->proc_swaps); |
bab45044 | 1097 | |
4e85aff4 | 1098 | (void) fscanf(m->proc_swaps, "%*s %*s %*s %*s %*s\n"); |
07b0b134 | 1099 | |
e04aad61 | 1100 | for (i = 1;; i++) { |
9fb3675e | 1101 | _cleanup_free_ char *dev = NULL, *d = NULL; |
07b0b134 ML |
1102 | int prio = 0, k; |
1103 | ||
646134dc ZJS |
1104 | k = fscanf(m->proc_swaps, |
1105 | "%ms " /* device/file */ | |
1106 | "%*s " /* type of swap */ | |
1107 | "%*s " /* swap size */ | |
1108 | "%*s " /* used */ | |
1109 | "%i\n", /* priority */ | |
1110 | &dev, &prio); | |
1111 | if (k != 2) { | |
07b0b134 | 1112 | if (k == EOF) |
4e85aff4 | 1113 | break; |
07b0b134 | 1114 | |
646134dc | 1115 | log_warning("Failed to parse /proc/swaps:%u", i); |
e04aad61 | 1116 | continue; |
07b0b134 | 1117 | } |
07b0b134 | 1118 | |
4e85aff4 | 1119 | d = cunescape(dev); |
4e85aff4 LP |
1120 | if (!d) |
1121 | return -ENOMEM; | |
1122 | ||
e04aad61 | 1123 | k = swap_process_new_swap(m, d, prio, set_flags); |
07b0b134 | 1124 | if (k < 0) |
e04aad61 | 1125 | r = k; |
07b0b134 ML |
1126 | } |
1127 | ||
e04aad61 LP |
1128 | return r; |
1129 | } | |
1130 | ||
718db961 LP |
1131 | static int swap_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) { |
1132 | Manager *m = userdata; | |
595ed347 | 1133 | Unit *u; |
4e434314 LP |
1134 | int r; |
1135 | ||
1136 | assert(m); | |
718db961 | 1137 | assert(revents & EPOLLPRI); |
4e434314 | 1138 | |
646134dc ZJS |
1139 | r = swap_load_proc_swaps(m, true); |
1140 | if (r < 0) { | |
e04aad61 LP |
1141 | log_error("Failed to reread /proc/swaps: %s", strerror(-r)); |
1142 | ||
1143 | /* Reset flags, just in case, for late calls */ | |
595ed347 MS |
1144 | LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) { |
1145 | Swap *swap = SWAP(u); | |
e04aad61 LP |
1146 | |
1147 | swap->is_active = swap->just_activated = false; | |
1148 | } | |
1149 | ||
1150 | return 0; | |
1151 | } | |
1152 | ||
1153 | manager_dispatch_load_queue(m); | |
1154 | ||
595ed347 MS |
1155 | LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) { |
1156 | Swap *swap = SWAP(u); | |
e04aad61 LP |
1157 | |
1158 | if (!swap->is_active) { | |
1159 | /* This has just been deactivated */ | |
1160 | ||
e04aad61 LP |
1161 | swap_unset_proc_swaps(swap); |
1162 | ||
1163 | switch (swap->state) { | |
1164 | ||
1165 | case SWAP_ACTIVE: | |
e1770af8 | 1166 | swap_enter_dead(swap, SWAP_SUCCESS); |
e04aad61 LP |
1167 | break; |
1168 | ||
1169 | default: | |
5bcb0f2b | 1170 | /* Fire again */ |
e04aad61 LP |
1171 | swap_set_state(swap, swap->state); |
1172 | break; | |
1173 | } | |
1174 | ||
1175 | } else if (swap->just_activated) { | |
1176 | ||
1177 | /* New swap entry */ | |
1178 | ||
1179 | switch (swap->state) { | |
1180 | ||
1181 | case SWAP_DEAD: | |
1182 | case SWAP_FAILED: | |
e1770af8 | 1183 | swap_enter_active(swap, SWAP_SUCCESS); |
e04aad61 LP |
1184 | break; |
1185 | ||
5bcb0f2b LP |
1186 | case SWAP_ACTIVATING: |
1187 | swap_set_state(swap, SWAP_ACTIVATING_DONE); | |
1188 | break; | |
1189 | ||
e04aad61 LP |
1190 | default: |
1191 | /* Nothing really changed, but let's | |
1192 | * issue an notification call | |
1193 | * nonetheless, in case somebody is | |
1194 | * waiting for this. */ | |
1195 | swap_set_state(swap, swap->state); | |
1196 | break; | |
1197 | } | |
1198 | } | |
1199 | ||
1200 | /* Reset the flags for later calls */ | |
1201 | swap->is_active = swap->just_activated = false; | |
1202 | } | |
1203 | ||
1204 | return 1; | |
1205 | } | |
1206 | ||
1207 | static Unit *swap_following(Unit *u) { | |
1208 | Swap *s = SWAP(u); | |
1209 | Swap *other, *first = NULL; | |
1210 | ||
1211 | assert(s); | |
1212 | ||
cdc89820 ZJS |
1213 | /* If the user configured the swap through /etc/fstab or |
1214 | * a device unit, follow that. */ | |
1215 | ||
1216 | if (s->from_fragment) | |
e04aad61 LP |
1217 | return NULL; |
1218 | ||
cdc89820 ZJS |
1219 | LIST_FOREACH_AFTER(same_devnode, other, s) |
1220 | if (other->from_fragment) | |
1221 | return UNIT(other); | |
1222 | ||
1223 | LIST_FOREACH_BEFORE(same_devnode, other, s) | |
1224 | if (other->from_fragment) | |
1225 | return UNIT(other); | |
1226 | ||
1227 | /* Otherwise make everybody follow the unit that's named after | |
1228 | * the swap device in the kernel */ | |
1229 | ||
1230 | if (streq_ptr(s->what, s->devnode)) | |
1231 | return NULL; | |
e04aad61 | 1232 | |
9670d583 LP |
1233 | LIST_FOREACH_AFTER(same_devnode, other, s) |
1234 | if (streq_ptr(other->what, other->devnode)) | |
e04aad61 LP |
1235 | return UNIT(other); |
1236 | ||
9670d583 LP |
1237 | LIST_FOREACH_BEFORE(same_devnode, other, s) { |
1238 | if (streq_ptr(other->what, other->devnode)) | |
e04aad61 LP |
1239 | return UNIT(other); |
1240 | ||
1241 | first = other; | |
1242 | } | |
1243 | ||
cdc89820 | 1244 | /* Fall back to the first on the list */ |
e04aad61 | 1245 | return UNIT(first); |
07b0b134 ML |
1246 | } |
1247 | ||
6210e7fc | 1248 | static int swap_following_set(Unit *u, Set **_set) { |
5bcb0f2b | 1249 | Swap *s = SWAP(u), *other; |
6210e7fc LP |
1250 | Set *set; |
1251 | int r; | |
1252 | ||
1253 | assert(s); | |
1254 | assert(_set); | |
1255 | ||
9670d583 | 1256 | if (LIST_JUST_US(same_devnode, s)) { |
6210e7fc LP |
1257 | *_set = NULL; |
1258 | return 0; | |
1259 | } | |
1260 | ||
d5099efc | 1261 | set = set_new(NULL); |
5bcb0f2b | 1262 | if (!set) |
6210e7fc LP |
1263 | return -ENOMEM; |
1264 | ||
9670d583 | 1265 | LIST_FOREACH_AFTER(same_devnode, other, s) { |
5bcb0f2b LP |
1266 | r = set_put(set, other); |
1267 | if (r < 0) | |
6210e7fc | 1268 | goto fail; |
5bcb0f2b | 1269 | } |
6210e7fc | 1270 | |
9670d583 | 1271 | LIST_FOREACH_BEFORE(same_devnode, other, s) { |
5bcb0f2b LP |
1272 | r = set_put(set, other); |
1273 | if (r < 0) | |
6210e7fc | 1274 | goto fail; |
5bcb0f2b | 1275 | } |
6210e7fc LP |
1276 | |
1277 | *_set = set; | |
1278 | return 1; | |
1279 | ||
1280 | fail: | |
1281 | set_free(set); | |
1282 | return r; | |
1283 | } | |
1284 | ||
07b0b134 ML |
1285 | static void swap_shutdown(Manager *m) { |
1286 | assert(m); | |
1287 | ||
718db961 LP |
1288 | m->swap_event_source = sd_event_source_unref(m->swap_event_source); |
1289 | ||
07b0b134 ML |
1290 | if (m->proc_swaps) { |
1291 | fclose(m->proc_swaps); | |
1292 | m->proc_swaps = NULL; | |
1293 | } | |
e04aad61 | 1294 | |
9670d583 LP |
1295 | hashmap_free(m->swaps_by_devnode); |
1296 | m->swaps_by_devnode = NULL; | |
07b0b134 ML |
1297 | } |
1298 | ||
07b0b134 ML |
1299 | static int swap_enumerate(Manager *m) { |
1300 | int r; | |
9670d583 | 1301 | |
07b0b134 ML |
1302 | assert(m); |
1303 | ||
4e434314 | 1304 | if (!m->proc_swaps) { |
646134dc ZJS |
1305 | m->proc_swaps = fopen("/proc/swaps", "re"); |
1306 | if (!m->proc_swaps) | |
718db961 | 1307 | return errno == ENOENT ? 0 : -errno; |
4e434314 | 1308 | |
151b9b96 | 1309 | r = sd_event_add_io(m->event, &m->swap_event_source, fileno(m->proc_swaps), EPOLLPRI, swap_dispatch_io, m); |
718db961 | 1310 | if (r < 0) |
29083707 LP |
1311 | goto fail; |
1312 | ||
1313 | /* Dispatch this before we dispatch SIGCHLD, so that | |
1314 | * we always get the events from /proc/swaps before | |
1315 | * the SIGCHLD of /sbin/swapon. */ | |
1316 | r = sd_event_source_set_priority(m->swap_event_source, -10); | |
1317 | if (r < 0) | |
718db961 | 1318 | goto fail; |
4e434314 LP |
1319 | } |
1320 | ||
646134dc ZJS |
1321 | r = swap_load_proc_swaps(m, false); |
1322 | if (r < 0) | |
718db961 LP |
1323 | goto fail; |
1324 | ||
1325 | return 0; | |
07b0b134 | 1326 | |
718db961 LP |
1327 | fail: |
1328 | swap_shutdown(m); | |
07b0b134 ML |
1329 | return r; |
1330 | } | |
1331 | ||
9670d583 LP |
1332 | int swap_process_new_device(Manager *m, struct udev_device *dev) { |
1333 | struct udev_list_entry *item = NULL, *first = NULL; | |
1334 | _cleanup_free_ char *e = NULL; | |
1335 | const char *dn; | |
1336 | Swap *s; | |
1337 | int r = 0; | |
1338 | ||
1339 | assert(m); | |
1340 | assert(dev); | |
1341 | ||
1342 | dn = udev_device_get_devnode(dev); | |
1343 | if (!dn) | |
1344 | return 0; | |
1345 | ||
1346 | e = unit_name_from_path(dn, ".swap"); | |
1347 | if (!e) | |
1348 | return -ENOMEM; | |
1349 | ||
1350 | s = hashmap_get(m->units, e); | |
1351 | if (s) | |
1352 | r = swap_set_devnode(s, dn); | |
1353 | ||
1354 | first = udev_device_get_devlinks_list_entry(dev); | |
1355 | udev_list_entry_foreach(item, first) { | |
1356 | _cleanup_free_ char *n = NULL; | |
1357 | ||
1358 | n = unit_name_from_path(udev_list_entry_get_name(item), ".swap"); | |
1359 | if (!n) | |
1360 | return -ENOMEM; | |
1361 | ||
1362 | s = hashmap_get(m->units, n); | |
1363 | if (s) { | |
1364 | int q; | |
1365 | ||
1366 | q = swap_set_devnode(s, dn); | |
1367 | if (q < 0) | |
1368 | r = q; | |
1369 | } | |
1370 | } | |
1371 | ||
1372 | return r; | |
1373 | } | |
1374 | ||
1375 | int swap_process_removed_device(Manager *m, struct udev_device *dev) { | |
9670d583 LP |
1376 | const char *dn; |
1377 | int r = 0; | |
1378 | Swap *s; | |
1379 | ||
1380 | dn = udev_device_get_devnode(dev); | |
1381 | if (!dn) | |
1382 | return 0; | |
1383 | ||
1384 | while ((s = hashmap_get(m->swaps_by_devnode, dn))) { | |
1385 | int q; | |
1386 | ||
1387 | q = swap_set_devnode(s, NULL); | |
1388 | if (q < 0) | |
1389 | r = q; | |
1390 | } | |
1391 | ||
1392 | return r; | |
1393 | } | |
1394 | ||
fdf20a31 | 1395 | static void swap_reset_failed(Unit *u) { |
5632e374 LP |
1396 | Swap *s = SWAP(u); |
1397 | ||
1398 | assert(s); | |
1399 | ||
fdf20a31 | 1400 | if (s->state == SWAP_FAILED) |
5632e374 | 1401 | swap_set_state(s, SWAP_DEAD); |
e04aad61 | 1402 | |
e1770af8 | 1403 | s->result = SWAP_SUCCESS; |
5632e374 LP |
1404 | } |
1405 | ||
718db961 | 1406 | static int swap_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) { |
814cc562 | 1407 | return unit_kill_common(u, who, signo, -1, SWAP(u)->control_pid, error); |
8a0867d6 LP |
1408 | } |
1409 | ||
68db7a3b ZJS |
1410 | static int swap_get_timeout(Unit *u, uint64_t *timeout) { |
1411 | Swap *s = SWAP(u); | |
1412 | int r; | |
1413 | ||
1414 | if (!s->timer_event_source) | |
1415 | return 0; | |
1416 | ||
1417 | r = sd_event_source_get_time(s->timer_event_source, timeout); | |
1418 | if (r < 0) | |
1419 | return r; | |
1420 | ||
1421 | return 1; | |
1422 | } | |
1423 | ||
5632e374 LP |
1424 | static const char* const swap_state_table[_SWAP_STATE_MAX] = { |
1425 | [SWAP_DEAD] = "dead", | |
e04aad61 | 1426 | [SWAP_ACTIVATING] = "activating", |
5bcb0f2b | 1427 | [SWAP_ACTIVATING_DONE] = "activating-done", |
5632e374 | 1428 | [SWAP_ACTIVE] = "active", |
e04aad61 LP |
1429 | [SWAP_DEACTIVATING] = "deactivating", |
1430 | [SWAP_ACTIVATING_SIGTERM] = "activating-sigterm", | |
1431 | [SWAP_ACTIVATING_SIGKILL] = "activating-sigkill", | |
1432 | [SWAP_DEACTIVATING_SIGTERM] = "deactivating-sigterm", | |
1433 | [SWAP_DEACTIVATING_SIGKILL] = "deactivating-sigkill", | |
fdf20a31 | 1434 | [SWAP_FAILED] = "failed" |
5632e374 LP |
1435 | }; |
1436 | ||
1437 | DEFINE_STRING_TABLE_LOOKUP(swap_state, SwapState); | |
1438 | ||
e04aad61 LP |
1439 | static const char* const swap_exec_command_table[_SWAP_EXEC_COMMAND_MAX] = { |
1440 | [SWAP_EXEC_ACTIVATE] = "ExecActivate", | |
1441 | [SWAP_EXEC_DEACTIVATE] = "ExecDeactivate", | |
1442 | }; | |
1443 | ||
1444 | DEFINE_STRING_TABLE_LOOKUP(swap_exec_command, SwapExecCommand); | |
1445 | ||
e1770af8 LP |
1446 | static const char* const swap_result_table[_SWAP_RESULT_MAX] = { |
1447 | [SWAP_SUCCESS] = "success", | |
1448 | [SWAP_FAILURE_RESOURCES] = "resources", | |
1449 | [SWAP_FAILURE_TIMEOUT] = "timeout", | |
1450 | [SWAP_FAILURE_EXIT_CODE] = "exit-code", | |
1451 | [SWAP_FAILURE_SIGNAL] = "signal", | |
1452 | [SWAP_FAILURE_CORE_DUMP] = "core-dump" | |
1453 | }; | |
1454 | ||
1455 | DEFINE_STRING_TABLE_LOOKUP(swap_result, SwapResult); | |
1456 | ||
07b0b134 | 1457 | const UnitVTable swap_vtable = { |
7d17cfbc | 1458 | .object_size = sizeof(Swap), |
718db961 LP |
1459 | .exec_context_offset = offsetof(Swap, exec_context), |
1460 | .cgroup_context_offset = offsetof(Swap, cgroup_context), | |
1461 | .kill_context_offset = offsetof(Swap, kill_context), | |
613b411c | 1462 | .exec_runtime_offset = offsetof(Swap, exec_runtime), |
3ef63c31 | 1463 | |
f975e971 LP |
1464 | .sections = |
1465 | "Unit\0" | |
1466 | "Swap\0" | |
1467 | "Install\0", | |
4ad49000 | 1468 | .private_section = "Swap", |
71645aca | 1469 | |
e04aad61 | 1470 | .no_alias = true, |
07b0b134 ML |
1471 | .no_instances = true, |
1472 | ||
4e85aff4 | 1473 | .init = swap_init, |
07b0b134 | 1474 | .load = swap_load, |
6e620bec | 1475 | .done = swap_done, |
07b0b134 ML |
1476 | |
1477 | .coldplug = swap_coldplug, | |
1478 | ||
1479 | .dump = swap_dump, | |
1480 | ||
1481 | .start = swap_start, | |
1482 | .stop = swap_stop, | |
1483 | ||
8a0867d6 LP |
1484 | .kill = swap_kill, |
1485 | ||
68db7a3b ZJS |
1486 | .get_timeout = swap_get_timeout, |
1487 | ||
07b0b134 ML |
1488 | .serialize = swap_serialize, |
1489 | .deserialize_item = swap_deserialize_item, | |
1490 | ||
1491 | .active_state = swap_active_state, | |
1492 | .sub_state_to_string = swap_sub_state_to_string, | |
1493 | ||
1494 | .check_gc = swap_check_gc, | |
1495 | ||
e04aad61 | 1496 | .sigchld_event = swap_sigchld_event, |
e04aad61 LP |
1497 | |
1498 | .reset_failed = swap_reset_failed, | |
1499 | ||
c4e2ceae | 1500 | .bus_interface = "org.freedesktop.systemd1.Swap", |
718db961 | 1501 | .bus_vtable = bus_swap_vtable, |
74c964d3 LP |
1502 | .bus_set_property = bus_swap_set_property, |
1503 | .bus_commit_properties = bus_swap_commit_properties, | |
07b0b134 | 1504 | |
e04aad61 | 1505 | .following = swap_following, |
6210e7fc | 1506 | .following_set = swap_following_set, |
5632e374 | 1507 | |
6e620bec | 1508 | .enumerate = swap_enumerate, |
c6918296 MS |
1509 | .shutdown = swap_shutdown, |
1510 | ||
1511 | .status_message_formats = { | |
1512 | .starting_stopping = { | |
1513 | [0] = "Activating swap %s...", | |
1514 | [1] = "Deactivating swap %s...", | |
1515 | }, | |
1516 | .finished_start_job = { | |
1517 | [JOB_DONE] = "Activated swap %s.", | |
1518 | [JOB_FAILED] = "Failed to activate swap %s.", | |
1519 | [JOB_DEPENDENCY] = "Dependency failed for %s.", | |
1520 | [JOB_TIMEOUT] = "Timed out activating swap %s.", | |
1521 | }, | |
1522 | .finished_stop_job = { | |
1523 | [JOB_DONE] = "Deactivated swap %s.", | |
1524 | [JOB_FAILED] = "Failed deactivating swap %s.", | |
1525 | [JOB_TIMEOUT] = "Timed out deactivating swap %s.", | |
1526 | }, | |
1527 | }, | |
07b0b134 | 1528 | }; |