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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 | |
9 | under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
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 | |
16 | General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
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" |
07b0b134 ML |
39 | |
40 | static const UnitActiveState state_translation_table[_SWAP_STATE_MAX] = { | |
41 | [SWAP_DEAD] = UNIT_INACTIVE, | |
e04aad61 | 42 | [SWAP_ACTIVATING] = UNIT_ACTIVATING, |
07b0b134 | 43 | [SWAP_ACTIVE] = UNIT_ACTIVE, |
e04aad61 LP |
44 | [SWAP_DEACTIVATING] = UNIT_DEACTIVATING, |
45 | [SWAP_ACTIVATING_SIGTERM] = UNIT_DEACTIVATING, | |
46 | [SWAP_ACTIVATING_SIGKILL] = UNIT_DEACTIVATING, | |
47 | [SWAP_DEACTIVATING_SIGTERM] = UNIT_DEACTIVATING, | |
48 | [SWAP_DEACTIVATING_SIGKILL] = UNIT_DEACTIVATING, | |
fdf20a31 | 49 | [SWAP_FAILED] = UNIT_FAILED |
07b0b134 ML |
50 | }; |
51 | ||
e04aad61 LP |
52 | static void swap_unset_proc_swaps(Swap *s) { |
53 | Swap *first; | |
54 | ||
55 | assert(s); | |
56 | ||
57 | if (!s->parameters_proc_swaps.what) | |
58 | return; | |
59 | ||
60 | /* Remove this unit from the chain of swaps which share the | |
61 | * same kernel swap device. */ | |
62 | ||
63 | first = hashmap_get(s->meta.manager->swaps_by_proc_swaps, s->parameters_proc_swaps.what); | |
64 | LIST_REMOVE(Swap, same_proc_swaps, first, s); | |
65 | ||
66 | if (first) | |
67 | hashmap_remove_and_replace(s->meta.manager->swaps_by_proc_swaps, s->parameters_proc_swaps.what, first->parameters_proc_swaps.what, first); | |
68 | else | |
69 | hashmap_remove(s->meta.manager->swaps_by_proc_swaps, s->parameters_proc_swaps.what); | |
70 | ||
71 | free(s->parameters_proc_swaps.what); | |
72 | s->parameters_proc_swaps.what = NULL; | |
73 | } | |
74 | ||
75 | static void swap_init(Unit *u) { | |
6e620bec LP |
76 | Swap *s = SWAP(u); |
77 | ||
78 | assert(s); | |
4e85aff4 | 79 | assert(s->meta.load_state == UNIT_STUB); |
6e620bec | 80 | |
e04aad61 LP |
81 | s->timeout_usec = DEFAULT_TIMEOUT_USEC; |
82 | ||
83 | exec_context_init(&s->exec_context); | |
84 | ||
4e85aff4 | 85 | s->parameters_etc_fstab.priority = s->parameters_proc_swaps.priority = s->parameters_fragment.priority = -1; |
e04aad61 LP |
86 | |
87 | s->timer_watch.type = WATCH_INVALID; | |
88 | ||
89 | s->control_command_id = _MOUNT_EXEC_COMMAND_INVALID; | |
90 | } | |
91 | ||
92 | static void swap_unwatch_control_pid(Swap *s) { | |
93 | assert(s); | |
94 | ||
95 | if (s->control_pid <= 0) | |
96 | return; | |
97 | ||
98 | unit_unwatch_pid(UNIT(s), s->control_pid); | |
99 | s->control_pid = 0; | |
6e620bec LP |
100 | } |
101 | ||
4e85aff4 LP |
102 | static void swap_done(Unit *u) { |
103 | Swap *s = SWAP(u); | |
07b0b134 | 104 | |
4e85aff4 | 105 | assert(s); |
07b0b134 | 106 | |
e04aad61 LP |
107 | swap_unset_proc_swaps(s); |
108 | ||
4e85aff4 | 109 | free(s->what); |
e04aad61 LP |
110 | s->what = NULL; |
111 | ||
4e85aff4 | 112 | free(s->parameters_etc_fstab.what); |
4e85aff4 | 113 | free(s->parameters_fragment.what); |
e04aad61 LP |
114 | s->parameters_etc_fstab.what = s->parameters_fragment.what = NULL; |
115 | ||
116 | exec_context_done(&s->exec_context); | |
117 | exec_command_done_array(s->exec_command, _SWAP_EXEC_COMMAND_MAX); | |
118 | s->control_command = NULL; | |
119 | ||
120 | swap_unwatch_control_pid(s); | |
121 | ||
122 | unit_unwatch_timer(u, &s->timer_watch); | |
07b0b134 ML |
123 | } |
124 | ||
6e2ef85b LP |
125 | int swap_add_one_mount_link(Swap *s, Mount *m) { |
126 | int r; | |
127 | ||
128 | assert(s); | |
129 | assert(m); | |
130 | ||
131 | if (s->meta.load_state != UNIT_LOADED || | |
132 | m->meta.load_state != UNIT_LOADED) | |
133 | return 0; | |
134 | ||
8407a5d0 LP |
135 | if (is_device_path(s->what)) |
136 | return 0; | |
137 | ||
6e2ef85b LP |
138 | if (!path_startswith(s->what, m->where)) |
139 | return 0; | |
140 | ||
2c966c03 | 141 | if ((r = unit_add_two_dependencies(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true)) < 0) |
6e2ef85b LP |
142 | return r; |
143 | ||
144 | return 0; | |
145 | } | |
146 | ||
147 | static int swap_add_mount_links(Swap *s) { | |
148 | Meta *other; | |
149 | int r; | |
150 | ||
151 | assert(s); | |
152 | ||
153 | LIST_FOREACH(units_per_type, other, s->meta.manager->units_per_type[UNIT_MOUNT]) | |
154 | if ((r = swap_add_one_mount_link(s, (Mount*) other)) < 0) | |
155 | return r; | |
156 | ||
157 | return 0; | |
158 | } | |
159 | ||
07b0b134 | 160 | static int swap_add_target_links(Swap *s) { |
07b0b134 | 161 | Unit *tu; |
4e85aff4 | 162 | SwapParameters *p; |
07b0b134 ML |
163 | int r; |
164 | ||
4e85aff4 LP |
165 | assert(s); |
166 | ||
167 | if (s->from_fragment) | |
168 | p = &s->parameters_fragment; | |
169 | else if (s->from_etc_fstab) | |
170 | p = &s->parameters_etc_fstab; | |
171 | else | |
172 | return 0; | |
173 | ||
398ef8ba | 174 | if ((r = manager_load_unit(s->meta.manager, SPECIAL_SWAP_TARGET, NULL, NULL, &tu)) < 0) |
07b0b134 ML |
175 | return r; |
176 | ||
81bf310e LP |
177 | if (!p->noauto && |
178 | (p->handle || s->meta.manager->swap_auto) && | |
510051fc | 179 | s->from_etc_fstab && |
81bf310e | 180 | s->meta.manager->running_as == MANAGER_SYSTEM) |
6e2ef85b LP |
181 | if ((r = unit_add_dependency(tu, UNIT_WANTS, UNIT(s), true)) < 0) |
182 | return r; | |
07b0b134 ML |
183 | |
184 | return unit_add_dependency(UNIT(s), UNIT_BEFORE, tu, true); | |
185 | } | |
186 | ||
173a8d04 LP |
187 | static int swap_add_device_links(Swap *s) { |
188 | SwapParameters *p; | |
189 | ||
190 | assert(s); | |
191 | ||
192 | if (!s->what) | |
193 | return 0; | |
194 | ||
195 | if (s->from_fragment) | |
196 | p = &s->parameters_fragment; | |
197 | else if (s->from_etc_fstab) | |
198 | p = &s->parameters_etc_fstab; | |
199 | else | |
200 | return 0; | |
201 | ||
cfcfd4ae LP |
202 | if (is_device_path(s->what)) |
203 | return unit_add_node_link(UNIT(s), s->what, | |
204 | !p->noauto && p->nofail && | |
205 | s->meta.manager->running_as == MANAGER_SYSTEM); | |
206 | else | |
207 | /* File based swap devices need to be ordered after | |
208 | * remount-rootfs.service, since they might need a | |
209 | * writable file system. */ | |
210 | return unit_add_dependency_by_name(UNIT(s), UNIT_AFTER, SPECIAL_REMOUNT_ROOTFS_SERVICE, NULL, true); | |
173a8d04 LP |
211 | } |
212 | ||
2edd4434 LP |
213 | static int swap_add_default_dependencies(Swap *s) { |
214 | int r; | |
215 | ||
216 | assert(s); | |
217 | ||
218 | if (s->meta.manager->running_as == MANAGER_SYSTEM) { | |
219 | ||
ead8e478 | 220 | if ((r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true)) < 0) |
e04aad61 | 221 | return r; |
2edd4434 LP |
222 | } |
223 | ||
224 | return 0; | |
225 | } | |
226 | ||
4e85aff4 LP |
227 | static int swap_verify(Swap *s) { |
228 | bool b; | |
229 | char *e; | |
230 | ||
4cd1fbcc | 231 | if (s->meta.load_state != UNIT_LOADED) |
4e85aff4 LP |
232 | return 0; |
233 | ||
234 | if (!(e = unit_name_from_path(s->what, ".swap"))) | |
235 | return -ENOMEM; | |
236 | ||
237 | b = unit_has_name(UNIT(s), e); | |
238 | free(e); | |
239 | ||
240 | if (!b) { | |
4cd1fbcc | 241 | log_error("%s: Value of \"What\" and unit name do not match, not loading.\n", s->meta.id); |
4e85aff4 LP |
242 | return -EINVAL; |
243 | } | |
244 | ||
e04aad61 LP |
245 | if (s->exec_context.pam_name && s->exec_context.kill_mode != KILL_CONTROL_GROUP) { |
246 | log_error("%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing.", s->meta.id); | |
247 | return -EINVAL; | |
248 | } | |
249 | ||
4e85aff4 LP |
250 | return 0; |
251 | } | |
252 | ||
07b0b134 ML |
253 | static int swap_load(Unit *u) { |
254 | int r; | |
255 | Swap *s = SWAP(u); | |
256 | ||
257 | assert(s); | |
258 | assert(u->meta.load_state == UNIT_STUB); | |
259 | ||
260 | /* Load a .swap file */ | |
261 | if ((r = unit_load_fragment_and_dropin_optional(u)) < 0) | |
262 | return r; | |
263 | ||
264 | if (u->meta.load_state == UNIT_LOADED) { | |
4e85aff4 LP |
265 | |
266 | if (s->meta.fragment_path) | |
267 | s->from_fragment = true; | |
268 | ||
269 | if (!s->what) { | |
270 | if (s->parameters_fragment.what) | |
271 | s->what = strdup(s->parameters_fragment.what); | |
272 | else if (s->parameters_etc_fstab.what) | |
273 | s->what = strdup(s->parameters_etc_fstab.what); | |
274 | else if (s->parameters_proc_swaps.what) | |
275 | s->what = strdup(s->parameters_proc_swaps.what); | |
276 | else | |
277 | s->what = unit_name_to_path(u->meta.id); | |
278 | ||
279 | if (!s->what) | |
07b0b134 | 280 | return -ENOMEM; |
4e85aff4 | 281 | } |
07b0b134 ML |
282 | |
283 | path_kill_slashes(s->what); | |
284 | ||
4e85aff4 LP |
285 | if (!s->meta.description) |
286 | if ((r = unit_set_description(u, s->what)) < 0) | |
287 | return r; | |
288 | ||
173a8d04 | 289 | if ((r = swap_add_device_links(s)) < 0) |
07b0b134 ML |
290 | return r; |
291 | ||
6e2ef85b LP |
292 | if ((r = swap_add_mount_links(s)) < 0) |
293 | return r; | |
07b0b134 ML |
294 | |
295 | if ((r = swap_add_target_links(s)) < 0) | |
296 | return r; | |
2edd4434 | 297 | |
d686d8a9 | 298 | if ((r = unit_add_default_cgroups(u)) < 0) |
f1a1cd64 LP |
299 | return r; |
300 | ||
2edd4434 LP |
301 | if (s->meta.default_dependencies) |
302 | if ((r = swap_add_default_dependencies(s)) < 0) | |
303 | return r; | |
07b0b134 ML |
304 | } |
305 | ||
306 | return swap_verify(s); | |
307 | } | |
308 | ||
4e85aff4 LP |
309 | int swap_add_one( |
310 | Manager *m, | |
311 | const char *what, | |
e04aad61 | 312 | const char *what_proc_swaps, |
4e85aff4 LP |
313 | int priority, |
314 | bool noauto, | |
173a8d04 | 315 | bool nofail, |
4e85aff4 | 316 | bool handle, |
e04aad61 LP |
317 | bool set_flags) { |
318 | ||
4e85aff4 | 319 | Unit *u = NULL; |
e04aad61 | 320 | char *e = NULL, *wp = NULL; |
2c7c6144 | 321 | bool delete = false; |
07b0b134 | 322 | int r; |
4e85aff4 LP |
323 | SwapParameters *p; |
324 | ||
325 | assert(m); | |
326 | assert(what); | |
07b0b134 ML |
327 | |
328 | if (!(e = unit_name_from_path(what, ".swap"))) | |
329 | return -ENOMEM; | |
330 | ||
e04aad61 LP |
331 | u = manager_get_unit(m, e); |
332 | ||
333 | if (what_proc_swaps && | |
334 | u && | |
335 | SWAP(u)->from_proc_swaps && | |
336 | !path_equal(SWAP(u)->parameters_proc_swaps.what, what_proc_swaps)) | |
337 | return -EEXIST; | |
4e85aff4 LP |
338 | |
339 | if (!u) { | |
07b0b134 ML |
340 | delete = true; |
341 | ||
342 | if (!(u = unit_new(m))) { | |
343 | free(e); | |
344 | return -ENOMEM; | |
345 | } | |
e04aad61 LP |
346 | |
347 | if ((r = unit_add_name(u, e)) < 0) | |
348 | goto fail; | |
349 | ||
350 | if (!(SWAP(u)->what = strdup(what))) { | |
351 | r = -ENOMEM; | |
352 | goto fail; | |
353 | } | |
354 | ||
355 | unit_add_to_load_queue(u); | |
4e85aff4 LP |
356 | } else |
357 | delete = false; | |
07b0b134 | 358 | |
e04aad61 LP |
359 | if (what_proc_swaps) { |
360 | Swap *first; | |
07b0b134 | 361 | |
4e85aff4 | 362 | p = &SWAP(u)->parameters_proc_swaps; |
e04aad61 LP |
363 | |
364 | if (!p->what) { | |
365 | if (!(wp = strdup(what_proc_swaps))) { | |
366 | r = -ENOMEM; | |
367 | goto fail; | |
368 | } | |
369 | ||
370 | if (!m->swaps_by_proc_swaps) | |
371 | if (!(m->swaps_by_proc_swaps = hashmap_new(string_hash_func, string_compare_func))) { | |
372 | r = -ENOMEM; | |
373 | goto fail; | |
374 | } | |
375 | ||
376 | free(p->what); | |
377 | p->what = wp; | |
378 | ||
379 | first = hashmap_get(m->swaps_by_proc_swaps, wp); | |
380 | LIST_PREPEND(Swap, same_proc_swaps, first, SWAP(u)); | |
381 | ||
382 | if ((r = hashmap_replace(m->swaps_by_proc_swaps, wp, first)) < 0) | |
383 | goto fail; | |
384 | } | |
385 | ||
386 | if (set_flags) { | |
387 | SWAP(u)->is_active = true; | |
388 | SWAP(u)->just_activated = !SWAP(u)->from_proc_swaps; | |
389 | } | |
390 | ||
4e85aff4 | 391 | SWAP(u)->from_proc_swaps = true; |
e04aad61 | 392 | |
4e85aff4 LP |
393 | } else { |
394 | p = &SWAP(u)->parameters_etc_fstab; | |
e04aad61 LP |
395 | |
396 | if (!(wp = strdup(what))) { | |
397 | r = -ENOMEM; | |
398 | goto fail; | |
399 | } | |
400 | ||
401 | free(p->what); | |
402 | p->what = wp; | |
403 | ||
4e85aff4 LP |
404 | SWAP(u)->from_etc_fstab = true; |
405 | } | |
07b0b134 | 406 | |
4e85aff4 LP |
407 | p->priority = priority; |
408 | p->noauto = noauto; | |
173a8d04 | 409 | p->nofail = nofail; |
4e85aff4 | 410 | p->handle = handle; |
07b0b134 | 411 | |
4e85aff4 | 412 | unit_add_to_dbus_queue(u); |
07b0b134 | 413 | |
4e85aff4 | 414 | free(e); |
07b0b134 ML |
415 | |
416 | return 0; | |
417 | ||
418 | fail: | |
e04aad61 LP |
419 | log_warning("Failed to load swap unit: %s", strerror(-r)); |
420 | ||
421 | free(wp); | |
4e85aff4 LP |
422 | free(e); |
423 | ||
424 | if (delete && u) | |
07b0b134 ML |
425 | unit_free(u); |
426 | ||
4e85aff4 | 427 | return r; |
07b0b134 ML |
428 | } |
429 | ||
e04aad61 LP |
430 | static int swap_process_new_swap(Manager *m, const char *device, int prio, bool set_flags) { |
431 | struct stat st; | |
432 | int r = 0, k; | |
433 | ||
434 | assert(m); | |
435 | ||
436 | if (stat(device, &st) >= 0 && S_ISBLK(st.st_mode)) { | |
437 | struct udev_device *d; | |
438 | const char *dn; | |
439 | struct udev_list_entry *item = NULL, *first = NULL; | |
440 | ||
441 | /* So this is a proper swap device. Create swap units | |
442 | * for all names this swap device is known under */ | |
443 | ||
444 | if (!(d = udev_device_new_from_devnum(m->udev, 'b', st.st_rdev))) | |
445 | return -ENOMEM; | |
446 | ||
447 | if ((dn = udev_device_get_devnode(d))) | |
448 | r = swap_add_one(m, dn, device, prio, false, false, false, set_flags); | |
449 | ||
450 | /* Add additional units for all symlinks */ | |
451 | first = udev_device_get_devlinks_list_entry(d); | |
452 | udev_list_entry_foreach(item, first) { | |
453 | const char *p; | |
454 | ||
455 | /* Don't bother with the /dev/block links */ | |
456 | p = udev_list_entry_get_name(item); | |
457 | ||
458 | if (path_startswith(p, "/dev/block/")) | |
459 | continue; | |
460 | ||
461 | if (stat(p, &st) >= 0) | |
462 | if ((!S_ISBLK(st.st_mode)) || st.st_rdev != udev_device_get_devnum(d)) | |
463 | continue; | |
464 | ||
465 | if ((k = swap_add_one(m, p, device, prio, false, false, false, set_flags)) < 0) | |
466 | r = k; | |
467 | } | |
468 | ||
469 | udev_device_unref(d); | |
470 | } | |
471 | ||
472 | if ((k = swap_add_one(m, device, device, prio, false, false, false, set_flags)) < 0) | |
473 | r = k; | |
474 | ||
475 | return r; | |
476 | } | |
477 | ||
07b0b134 ML |
478 | static void swap_set_state(Swap *s, SwapState state) { |
479 | SwapState old_state; | |
e04aad61 | 480 | |
07b0b134 ML |
481 | assert(s); |
482 | ||
483 | old_state = s->state; | |
484 | s->state = state; | |
485 | ||
e04aad61 LP |
486 | if (state != SWAP_ACTIVATING && |
487 | state != SWAP_ACTIVATING_SIGTERM && | |
488 | state != SWAP_ACTIVATING_SIGKILL && | |
489 | state != SWAP_DEACTIVATING && | |
490 | state != SWAP_DEACTIVATING_SIGTERM && | |
491 | state != SWAP_DEACTIVATING_SIGKILL) { | |
492 | unit_unwatch_timer(UNIT(s), &s->timer_watch); | |
493 | swap_unwatch_control_pid(s); | |
494 | s->control_command = NULL; | |
495 | s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; | |
496 | } | |
497 | ||
07b0b134 ML |
498 | if (state != old_state) |
499 | log_debug("%s changed %s -> %s", | |
4cd1fbcc | 500 | s->meta.id, |
07b0b134 ML |
501 | swap_state_to_string(old_state), |
502 | swap_state_to_string(state)); | |
503 | ||
504 | unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state]); | |
505 | } | |
506 | ||
507 | static int swap_coldplug(Unit *u) { | |
508 | Swap *s = SWAP(u); | |
509 | SwapState new_state = SWAP_DEAD; | |
e04aad61 | 510 | int r; |
07b0b134 ML |
511 | |
512 | assert(s); | |
513 | assert(s->state == SWAP_DEAD); | |
514 | ||
515 | if (s->deserialized_state != s->state) | |
516 | new_state = s->deserialized_state; | |
4e85aff4 | 517 | else if (s->from_proc_swaps) |
07b0b134 ML |
518 | new_state = SWAP_ACTIVE; |
519 | ||
e04aad61 LP |
520 | if (new_state != s->state) { |
521 | ||
522 | if (new_state == SWAP_ACTIVATING || | |
523 | new_state == SWAP_ACTIVATING_SIGTERM || | |
524 | new_state == SWAP_ACTIVATING_SIGKILL || | |
525 | new_state == SWAP_DEACTIVATING || | |
526 | new_state == SWAP_DEACTIVATING_SIGTERM || | |
527 | new_state == SWAP_DEACTIVATING_SIGKILL) { | |
528 | ||
529 | if (s->control_pid <= 0) | |
530 | return -EBADMSG; | |
531 | ||
532 | if ((r = unit_watch_pid(UNIT(s), s->control_pid)) < 0) | |
533 | return r; | |
534 | ||
535 | if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0) | |
536 | return r; | |
537 | } | |
538 | ||
4e85aff4 | 539 | swap_set_state(s, new_state); |
e04aad61 | 540 | } |
07b0b134 ML |
541 | |
542 | return 0; | |
543 | } | |
544 | ||
545 | static void swap_dump(Unit *u, FILE *f, const char *prefix) { | |
546 | Swap *s = SWAP(u); | |
4e85aff4 | 547 | SwapParameters *p; |
07b0b134 ML |
548 | |
549 | assert(s); | |
4e85aff4 LP |
550 | assert(f); |
551 | ||
552 | if (s->from_proc_swaps) | |
553 | p = &s->parameters_proc_swaps; | |
554 | else if (s->from_fragment) | |
555 | p = &s->parameters_fragment; | |
556 | else | |
557 | p = &s->parameters_etc_fstab; | |
07b0b134 ML |
558 | |
559 | fprintf(f, | |
4e85aff4 | 560 | "%sSwap State: %s\n" |
07b0b134 ML |
561 | "%sWhat: %s\n" |
562 | "%sPriority: %i\n" | |
4e85aff4 | 563 | "%sNoAuto: %s\n" |
173a8d04 | 564 | "%sNoFail: %s\n" |
4e85aff4 LP |
565 | "%sHandle: %s\n" |
566 | "%sFrom /etc/fstab: %s\n" | |
567 | "%sFrom /proc/swaps: %s\n" | |
568 | "%sFrom fragment: %s\n", | |
07b0b134 ML |
569 | prefix, swap_state_to_string(s->state), |
570 | prefix, s->what, | |
4e85aff4 LP |
571 | prefix, p->priority, |
572 | prefix, yes_no(p->noauto), | |
173a8d04 | 573 | prefix, yes_no(p->nofail), |
4e85aff4 LP |
574 | prefix, yes_no(p->handle), |
575 | prefix, yes_no(s->from_etc_fstab), | |
576 | prefix, yes_no(s->from_proc_swaps), | |
577 | prefix, yes_no(s->from_fragment)); | |
e04aad61 LP |
578 | |
579 | if (s->control_pid > 0) | |
580 | fprintf(f, | |
581 | "%sControl PID: %lu\n", | |
582 | prefix, (unsigned long) s->control_pid); | |
583 | ||
584 | exec_context_dump(&s->exec_context, f, prefix); | |
585 | } | |
586 | ||
587 | static int swap_spawn(Swap *s, ExecCommand *c, pid_t *_pid) { | |
588 | pid_t pid; | |
589 | int r; | |
590 | ||
591 | assert(s); | |
592 | assert(c); | |
593 | assert(_pid); | |
594 | ||
595 | if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0) | |
596 | goto fail; | |
597 | ||
598 | if ((r = exec_spawn(c, | |
599 | NULL, | |
600 | &s->exec_context, | |
601 | NULL, 0, | |
602 | s->meta.manager->environment, | |
603 | true, | |
604 | true, | |
605 | true, | |
606 | s->meta.manager->confirm_spawn, | |
607 | s->meta.cgroup_bondings, | |
608 | &pid)) < 0) | |
609 | goto fail; | |
610 | ||
611 | if ((r = unit_watch_pid(UNIT(s), pid)) < 0) | |
612 | /* FIXME: we need to do something here */ | |
613 | goto fail; | |
614 | ||
615 | *_pid = pid; | |
616 | ||
617 | return 0; | |
618 | ||
619 | fail: | |
620 | unit_unwatch_timer(UNIT(s), &s->timer_watch); | |
621 | ||
622 | return r; | |
07b0b134 ML |
623 | } |
624 | ||
625 | static void swap_enter_dead(Swap *s, bool success) { | |
626 | assert(s); | |
627 | ||
e04aad61 LP |
628 | if (!success) |
629 | s->failure = true; | |
630 | ||
631 | swap_set_state(s, s->failure ? SWAP_FAILED : SWAP_DEAD); | |
07b0b134 ML |
632 | } |
633 | ||
e04aad61 LP |
634 | static void swap_enter_active(Swap *s, bool success) { |
635 | assert(s); | |
636 | ||
637 | if (!success) | |
638 | s->failure = true; | |
639 | ||
640 | swap_set_state(s, SWAP_ACTIVE); | |
641 | } | |
642 | ||
643 | static void swap_enter_signal(Swap *s, SwapState state, bool success) { | |
07b0b134 | 644 | int r; |
e04aad61 LP |
645 | Set *pid_set = NULL; |
646 | bool wait_for_exit = false; | |
07b0b134 ML |
647 | |
648 | assert(s); | |
e04aad61 LP |
649 | |
650 | if (!success) | |
651 | s->failure = true; | |
652 | ||
653 | if (s->exec_context.kill_mode != KILL_NONE) { | |
654 | int sig = (state == SWAP_ACTIVATING_SIGTERM || | |
655 | state == SWAP_DEACTIVATING_SIGTERM) ? s->exec_context.kill_signal : SIGKILL; | |
656 | ||
657 | if (s->control_pid > 0) { | |
658 | if (kill(s->exec_context.kill_mode == KILL_PROCESS_GROUP ? | |
659 | -s->control_pid : | |
660 | s->control_pid, sig) < 0 && errno != ESRCH) | |
661 | ||
662 | log_warning("Failed to kill control process %li: %m", (long) s->control_pid); | |
663 | else | |
664 | wait_for_exit = true; | |
665 | } | |
666 | ||
667 | if (s->exec_context.kill_mode == KILL_CONTROL_GROUP) { | |
668 | ||
669 | if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func))) { | |
670 | r = -ENOMEM; | |
671 | goto fail; | |
672 | } | |
673 | ||
674 | /* Exclude the control pid from being killed via the cgroup */ | |
675 | if (s->control_pid > 0) | |
676 | if ((r = set_put(pid_set, LONG_TO_PTR(s->control_pid))) < 0) | |
677 | goto fail; | |
678 | ||
679 | if ((r = cgroup_bonding_kill_list(s->meta.cgroup_bondings, sig, pid_set)) < 0) { | |
680 | if (r != -EAGAIN && r != -ESRCH && r != -ENOENT) | |
681 | log_warning("Failed to kill control group: %s", strerror(-r)); | |
682 | } else if (r > 0) | |
683 | wait_for_exit = true; | |
684 | ||
685 | set_free(pid_set); | |
686 | } | |
687 | } | |
688 | ||
689 | if (wait_for_exit) { | |
690 | if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0) | |
691 | goto fail; | |
692 | ||
693 | swap_set_state(s, state); | |
694 | } else | |
695 | swap_enter_dead(s, true); | |
696 | ||
697 | return; | |
698 | ||
699 | fail: | |
700 | log_warning("%s failed to kill processes: %s", s->meta.id, strerror(-r)); | |
701 | ||
702 | swap_enter_dead(s, false); | |
703 | ||
704 | if (pid_set) | |
705 | set_free(pid_set); | |
706 | } | |
707 | ||
708 | static void swap_enter_activating(Swap *s) { | |
709 | int r, priority; | |
710 | ||
711 | assert(s); | |
712 | ||
713 | s->control_command_id = SWAP_EXEC_ACTIVATE; | |
714 | s->control_command = s->exec_command + SWAP_EXEC_ACTIVATE; | |
07b0b134 | 715 | |
4e85aff4 LP |
716 | if (s->from_fragment) |
717 | priority = s->parameters_fragment.priority; | |
718 | else if (s->from_etc_fstab) | |
719 | priority = s->parameters_etc_fstab.priority; | |
e04aad61 LP |
720 | else |
721 | priority = -1; | |
4e85aff4 | 722 | |
e04aad61 LP |
723 | if (priority >= 0) { |
724 | char p[LINE_MAX]; | |
07b0b134 | 725 | |
e04aad61 LP |
726 | snprintf(p, sizeof(p), "%i", priority); |
727 | char_array_0(p); | |
07b0b134 | 728 | |
e04aad61 LP |
729 | r = exec_command_set( |
730 | s->control_command, | |
731 | "/sbin/swapon", | |
732 | "-p", | |
733 | p, | |
734 | s->what, | |
735 | NULL); | |
736 | } else | |
737 | r = exec_command_set( | |
738 | s->control_command, | |
739 | "/sbin/swapon", | |
740 | s->what, | |
741 | NULL); | |
742 | ||
743 | if (r < 0) | |
744 | goto fail; | |
745 | ||
746 | swap_unwatch_control_pid(s); | |
747 | ||
748 | if ((r = swap_spawn(s, s->control_command, &s->control_pid)) < 0) | |
749 | goto fail; | |
750 | ||
751 | swap_set_state(s, SWAP_ACTIVATING); | |
752 | ||
753 | return; | |
754 | ||
755 | fail: | |
756 | log_warning("%s failed to run 'swapon' task: %s", s->meta.id, strerror(-r)); | |
757 | swap_enter_dead(s, false); | |
758 | } | |
759 | ||
760 | static void swap_enter_deactivating(Swap *s, bool success) { | |
761 | int r; | |
762 | ||
763 | assert(s); | |
764 | ||
765 | if (!success) | |
766 | s->failure = true; | |
767 | ||
768 | s->control_command_id = SWAP_EXEC_DEACTIVATE; | |
769 | s->control_command = s->exec_command + SWAP_EXEC_DEACTIVATE; | |
770 | ||
771 | if ((r = exec_command_set( | |
772 | s->control_command, | |
773 | "/sbin/swapoff", | |
774 | s->what, | |
775 | NULL)) < 0) | |
776 | goto fail; | |
777 | ||
778 | swap_unwatch_control_pid(s); | |
779 | ||
780 | if ((r = swap_spawn(s, s->control_command, &s->control_pid)) < 0) | |
781 | goto fail; | |
782 | ||
783 | swap_set_state(s, SWAP_DEACTIVATING); | |
784 | ||
785 | return; | |
786 | ||
787 | fail: | |
788 | log_warning("%s failed to run 'swapoff' task: %s", s->meta.id, strerror(-r)); | |
789 | swap_enter_active(s, false); | |
790 | } | |
791 | ||
792 | static int swap_start(Unit *u) { | |
793 | Swap *s = SWAP(u); | |
794 | ||
795 | assert(s); | |
796 | ||
797 | /* We cannot fulfill this request right now, try again later | |
798 | * please! */ | |
799 | ||
800 | if (s->state == SWAP_DEACTIVATING || | |
801 | s->state == SWAP_DEACTIVATING_SIGTERM || | |
802 | s->state == SWAP_DEACTIVATING_SIGKILL || | |
803 | s->state == SWAP_ACTIVATING_SIGTERM || | |
804 | s->state == SWAP_ACTIVATING_SIGKILL) | |
805 | return -EAGAIN; | |
806 | ||
807 | if (s->state == SWAP_ACTIVATING) | |
808 | return 0; | |
809 | ||
810 | assert(s->state == SWAP_DEAD || s->state == SWAP_FAILED); | |
811 | ||
812 | s->failure = false; | |
813 | swap_enter_activating(s); | |
07b0b134 ML |
814 | return 0; |
815 | } | |
816 | ||
817 | static int swap_stop(Unit *u) { | |
818 | Swap *s = SWAP(u); | |
07b0b134 ML |
819 | |
820 | assert(s); | |
821 | ||
e04aad61 LP |
822 | if (s->state == SWAP_DEACTIVATING || |
823 | s->state == SWAP_DEACTIVATING_SIGTERM || | |
824 | s->state == SWAP_DEACTIVATING_SIGKILL || | |
825 | s->state == SWAP_ACTIVATING_SIGTERM || | |
826 | s->state == SWAP_ACTIVATING_SIGKILL) | |
827 | return 0; | |
07b0b134 | 828 | |
e04aad61 LP |
829 | assert(s->state == SWAP_ACTIVATING || |
830 | s->state == SWAP_ACTIVE); | |
07b0b134 | 831 | |
e04aad61 | 832 | swap_enter_deactivating(s, true); |
07b0b134 ML |
833 | return 0; |
834 | } | |
835 | ||
836 | static int swap_serialize(Unit *u, FILE *f, FDSet *fds) { | |
837 | Swap *s = SWAP(u); | |
838 | ||
839 | assert(s); | |
840 | assert(f); | |
841 | assert(fds); | |
842 | ||
843 | unit_serialize_item(u, f, "state", swap_state_to_string(s->state)); | |
e04aad61 LP |
844 | unit_serialize_item(u, f, "failure", yes_no(s->failure)); |
845 | ||
846 | if (s->control_pid > 0) | |
847 | unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) s->control_pid); | |
848 | ||
849 | if (s->control_command_id >= 0) | |
850 | unit_serialize_item(u, f, "control-command", swap_exec_command_to_string(s->control_command_id)); | |
07b0b134 ML |
851 | |
852 | return 0; | |
853 | } | |
854 | ||
855 | static int swap_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
856 | Swap *s = SWAP(u); | |
857 | ||
858 | assert(s); | |
859 | assert(fds); | |
860 | ||
861 | if (streq(key, "state")) { | |
862 | SwapState state; | |
863 | ||
864 | if ((state = swap_state_from_string(value)) < 0) | |
865 | log_debug("Failed to parse state value %s", value); | |
866 | else | |
867 | s->deserialized_state = state; | |
e04aad61 LP |
868 | } else if (streq(key, "failure")) { |
869 | int b; | |
870 | ||
871 | if ((b = parse_boolean(value)) < 0) | |
872 | log_debug("Failed to parse failure value %s", value); | |
873 | else | |
874 | s->failure = b || s->failure; | |
875 | ||
876 | } else if (streq(key, "control-pid")) { | |
877 | pid_t pid; | |
878 | ||
879 | if (parse_pid(value, &pid) < 0) | |
880 | log_debug("Failed to parse control-pid value %s", value); | |
881 | else | |
882 | s->control_pid = pid; | |
883 | ||
884 | } else if (streq(key, "control-command")) { | |
885 | SwapExecCommand id; | |
886 | ||
887 | if ((id = swap_exec_command_from_string(value)) < 0) | |
888 | log_debug("Failed to parse exec-command value %s", value); | |
889 | else { | |
890 | s->control_command_id = id; | |
891 | s->control_command = s->exec_command + id; | |
892 | } | |
893 | ||
07b0b134 ML |
894 | } else |
895 | log_debug("Unknown serialization key '%s'", key); | |
896 | ||
897 | return 0; | |
898 | } | |
899 | ||
900 | static UnitActiveState swap_active_state(Unit *u) { | |
901 | assert(u); | |
902 | ||
903 | return state_translation_table[SWAP(u)->state]; | |
904 | } | |
905 | ||
906 | static const char *swap_sub_state_to_string(Unit *u) { | |
907 | assert(u); | |
908 | ||
909 | return swap_state_to_string(SWAP(u)->state); | |
910 | } | |
911 | ||
912 | static bool swap_check_gc(Unit *u) { | |
913 | Swap *s = SWAP(u); | |
914 | ||
915 | assert(s); | |
916 | ||
4e85aff4 | 917 | return s->from_etc_fstab || s->from_proc_swaps; |
07b0b134 ML |
918 | } |
919 | ||
e04aad61 LP |
920 | static void swap_sigchld_event(Unit *u, pid_t pid, int code, int status) { |
921 | Swap *s = SWAP(u); | |
922 | bool success; | |
923 | ||
924 | assert(s); | |
925 | assert(pid >= 0); | |
926 | ||
927 | if (pid != s->control_pid) | |
928 | return; | |
929 | ||
930 | s->control_pid = 0; | |
931 | ||
932 | success = is_clean_exit(code, status); | |
933 | s->failure = s->failure || !success; | |
934 | ||
935 | if (s->control_command) { | |
936 | exec_status_exit(&s->control_command->exec_status, pid, code, status, s->exec_context.utmp_id); | |
937 | s->control_command = NULL; | |
938 | s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; | |
939 | } | |
940 | ||
941 | log_full(success ? LOG_DEBUG : LOG_NOTICE, | |
942 | "%s swap process exited, code=%s status=%i", u->meta.id, sigchld_code_to_string(code), status); | |
943 | ||
944 | switch (s->state) { | |
945 | ||
946 | case SWAP_ACTIVATING: | |
947 | case SWAP_ACTIVATING_SIGTERM: | |
948 | case SWAP_ACTIVATING_SIGKILL: | |
949 | ||
950 | if (success) | |
951 | swap_enter_active(s, true); | |
952 | else | |
953 | swap_enter_dead(s, false); | |
954 | break; | |
955 | ||
956 | case SWAP_DEACTIVATING: | |
957 | case SWAP_DEACTIVATING_SIGKILL: | |
958 | case SWAP_DEACTIVATING_SIGTERM: | |
959 | ||
960 | if (success) | |
961 | swap_enter_dead(s, true); | |
962 | else | |
963 | swap_enter_dead(s, false); | |
964 | break; | |
965 | ||
966 | default: | |
967 | assert_not_reached("Uh, control process died at wrong time."); | |
968 | } | |
969 | ||
970 | /* Notify clients about changed exit status */ | |
971 | unit_add_to_dbus_queue(u); | |
972 | ||
973 | /* Request a reload of /proc/swaps, so that following units | |
974 | * can follow our state change */ | |
975 | u->meta.manager->request_reload = true; | |
976 | } | |
977 | ||
978 | static void swap_timer_event(Unit *u, uint64_t elapsed, Watch *w) { | |
979 | Swap *s = SWAP(u); | |
980 | ||
981 | assert(s); | |
982 | assert(elapsed == 1); | |
983 | assert(w == &s->timer_watch); | |
984 | ||
985 | switch (s->state) { | |
986 | ||
987 | case SWAP_ACTIVATING: | |
988 | log_warning("%s activation timed out. Stopping.", u->meta.id); | |
989 | swap_enter_signal(s, SWAP_ACTIVATING_SIGTERM, false); | |
990 | break; | |
991 | ||
992 | case SWAP_DEACTIVATING: | |
993 | log_warning("%s deactivation timed out. Stopping.", u->meta.id); | |
994 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGTERM, false); | |
995 | break; | |
996 | ||
997 | case SWAP_ACTIVATING_SIGTERM: | |
ba035df2 LP |
998 | if (s->exec_context.send_sigkill) { |
999 | log_warning("%s activation timed out. Killing.", u->meta.id); | |
1000 | swap_enter_signal(s, SWAP_ACTIVATING_SIGKILL, false); | |
1001 | } else { | |
1002 | log_warning("%s activation timed out. Skipping SIGKILL. Ignoring.", u->meta.id); | |
1003 | swap_enter_dead(s, false); | |
1004 | } | |
e04aad61 LP |
1005 | break; |
1006 | ||
1007 | case SWAP_DEACTIVATING_SIGTERM: | |
ba035df2 LP |
1008 | if (s->exec_context.send_sigkill) { |
1009 | log_warning("%s deactivation timed out. Killing.", u->meta.id); | |
1010 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, false); | |
1011 | } else { | |
1012 | log_warning("%s deactivation timed out. Skipping SIGKILL. Ignoring.", u->meta.id); | |
1013 | swap_enter_dead(s, false); | |
1014 | } | |
e04aad61 LP |
1015 | break; |
1016 | ||
1017 | case SWAP_ACTIVATING_SIGKILL: | |
1018 | case SWAP_DEACTIVATING_SIGKILL: | |
1019 | log_warning("%s swap process still around after SIGKILL. Ignoring.", u->meta.id); | |
1020 | swap_enter_dead(s, false); | |
1021 | break; | |
1022 | ||
1023 | default: | |
1024 | assert_not_reached("Timeout at wrong time."); | |
1025 | } | |
1026 | } | |
1027 | ||
1028 | static int swap_load_proc_swaps(Manager *m, bool set_flags) { | |
1029 | unsigned i; | |
1030 | int r = 0; | |
1031 | ||
1032 | assert(m); | |
1033 | ||
07b0b134 | 1034 | rewind(m->proc_swaps); |
bab45044 | 1035 | |
4e85aff4 | 1036 | (void) fscanf(m->proc_swaps, "%*s %*s %*s %*s %*s\n"); |
07b0b134 | 1037 | |
e04aad61 | 1038 | for (i = 1;; i++) { |
07b0b134 ML |
1039 | char *dev = NULL, *d; |
1040 | int prio = 0, k; | |
1041 | ||
4e85aff4 | 1042 | if ((k = fscanf(m->proc_swaps, |
e04aad61 LP |
1043 | "%ms " /* device/file */ |
1044 | "%*s " /* type of swap */ | |
1045 | "%*s " /* swap size */ | |
1046 | "%*s " /* used */ | |
4e85aff4 LP |
1047 | "%i\n", /* priority */ |
1048 | &dev, &prio)) != 2) { | |
07b0b134 | 1049 | |
07b0b134 | 1050 | if (k == EOF) |
4e85aff4 | 1051 | break; |
07b0b134 | 1052 | |
e04aad61 | 1053 | log_warning("Failed to parse /proc/swaps:%u.", i); |
07b0b134 | 1054 | free(dev); |
e04aad61 | 1055 | continue; |
07b0b134 | 1056 | } |
07b0b134 | 1057 | |
4e85aff4 | 1058 | d = cunescape(dev); |
07b0b134 | 1059 | free(dev); |
4e85aff4 LP |
1060 | |
1061 | if (!d) | |
1062 | return -ENOMEM; | |
1063 | ||
e04aad61 | 1064 | k = swap_process_new_swap(m, d, prio, set_flags); |
07b0b134 ML |
1065 | free(d); |
1066 | ||
1067 | if (k < 0) | |
e04aad61 | 1068 | r = k; |
07b0b134 ML |
1069 | } |
1070 | ||
e04aad61 LP |
1071 | return r; |
1072 | } | |
1073 | ||
1074 | int swap_dispatch_reload(Manager *m) { | |
4e434314 | 1075 | /* This function should go as soon as the kernel properly notifies us */ |
e04aad61 LP |
1076 | |
1077 | if (_likely_(!m->request_reload)) | |
1078 | return 0; | |
1079 | ||
1080 | m->request_reload = false; | |
1081 | ||
4e434314 LP |
1082 | return swap_fd_event(m, EPOLLPRI); |
1083 | } | |
1084 | ||
1085 | int swap_fd_event(Manager *m, int events) { | |
1086 | Meta *meta; | |
1087 | int r; | |
1088 | ||
1089 | assert(m); | |
1090 | assert(events & EPOLLPRI); | |
1091 | ||
e04aad61 LP |
1092 | if ((r == swap_load_proc_swaps(m, true)) < 0) { |
1093 | log_error("Failed to reread /proc/swaps: %s", strerror(-r)); | |
1094 | ||
1095 | /* Reset flags, just in case, for late calls */ | |
1096 | LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_SWAP]) { | |
1097 | Swap *swap = (Swap*) meta; | |
1098 | ||
1099 | swap->is_active = swap->just_activated = false; | |
1100 | } | |
1101 | ||
1102 | return 0; | |
1103 | } | |
1104 | ||
1105 | manager_dispatch_load_queue(m); | |
1106 | ||
1107 | LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_SWAP]) { | |
1108 | Swap *swap = (Swap*) meta; | |
1109 | ||
1110 | if (!swap->is_active) { | |
1111 | /* This has just been deactivated */ | |
1112 | ||
1113 | swap->from_proc_swaps = false; | |
1114 | swap_unset_proc_swaps(swap); | |
1115 | ||
1116 | switch (swap->state) { | |
1117 | ||
1118 | case SWAP_ACTIVE: | |
1119 | swap_enter_dead(swap, true); | |
1120 | break; | |
1121 | ||
1122 | default: | |
1123 | swap_set_state(swap, swap->state); | |
1124 | break; | |
1125 | } | |
1126 | ||
1127 | } else if (swap->just_activated) { | |
1128 | ||
1129 | /* New swap entry */ | |
1130 | ||
1131 | switch (swap->state) { | |
1132 | ||
1133 | case SWAP_DEAD: | |
1134 | case SWAP_FAILED: | |
1135 | swap_enter_active(swap, true); | |
1136 | break; | |
1137 | ||
1138 | default: | |
1139 | /* Nothing really changed, but let's | |
1140 | * issue an notification call | |
1141 | * nonetheless, in case somebody is | |
1142 | * waiting for this. */ | |
1143 | swap_set_state(swap, swap->state); | |
1144 | break; | |
1145 | } | |
1146 | } | |
1147 | ||
1148 | /* Reset the flags for later calls */ | |
1149 | swap->is_active = swap->just_activated = false; | |
1150 | } | |
1151 | ||
1152 | return 1; | |
1153 | } | |
1154 | ||
1155 | static Unit *swap_following(Unit *u) { | |
1156 | Swap *s = SWAP(u); | |
1157 | Swap *other, *first = NULL; | |
1158 | ||
1159 | assert(s); | |
1160 | ||
1161 | if (streq_ptr(s->what, s->parameters_proc_swaps.what)) | |
1162 | return NULL; | |
1163 | ||
1164 | /* Make everybody follow the unit that's named after the swap | |
1165 | * device in the kernel */ | |
1166 | ||
1167 | LIST_FOREACH_AFTER(same_proc_swaps, other, s) | |
1168 | if (streq_ptr(other->what, other->parameters_proc_swaps.what)) | |
1169 | return UNIT(other); | |
1170 | ||
1171 | LIST_FOREACH_BEFORE(same_proc_swaps, other, s) { | |
1172 | if (streq_ptr(other->what, other->parameters_proc_swaps.what)) | |
1173 | return UNIT(other); | |
1174 | ||
1175 | first = other; | |
1176 | } | |
1177 | ||
1178 | return UNIT(first); | |
07b0b134 ML |
1179 | } |
1180 | ||
6210e7fc LP |
1181 | static int swap_following_set(Unit *u, Set **_set) { |
1182 | Swap *s = SWAP(u); | |
1183 | Swap *other; | |
1184 | Set *set; | |
1185 | int r; | |
1186 | ||
1187 | assert(s); | |
1188 | assert(_set); | |
1189 | ||
1190 | if (LIST_JUST_US(same_proc_swaps, s)) { | |
1191 | *_set = NULL; | |
1192 | return 0; | |
1193 | } | |
1194 | ||
1195 | if (!(set = set_new(NULL, NULL))) | |
1196 | return -ENOMEM; | |
1197 | ||
1198 | LIST_FOREACH_AFTER(same_proc_swaps, other, s) | |
1199 | if ((r = set_put(set, other)) < 0) | |
1200 | goto fail; | |
1201 | ||
1202 | LIST_FOREACH_BEFORE(same_proc_swaps, other, s) | |
1203 | if ((r = set_put(set, other)) < 0) | |
1204 | goto fail; | |
1205 | ||
1206 | *_set = set; | |
1207 | return 1; | |
1208 | ||
1209 | fail: | |
1210 | set_free(set); | |
1211 | return r; | |
1212 | } | |
1213 | ||
07b0b134 ML |
1214 | static void swap_shutdown(Manager *m) { |
1215 | assert(m); | |
1216 | ||
1217 | if (m->proc_swaps) { | |
1218 | fclose(m->proc_swaps); | |
1219 | m->proc_swaps = NULL; | |
1220 | } | |
e04aad61 LP |
1221 | |
1222 | hashmap_free(m->swaps_by_proc_swaps); | |
1223 | m->swaps_by_proc_swaps = NULL; | |
07b0b134 ML |
1224 | } |
1225 | ||
07b0b134 ML |
1226 | static int swap_enumerate(Manager *m) { |
1227 | int r; | |
4e434314 | 1228 | struct epoll_event ev; |
07b0b134 ML |
1229 | assert(m); |
1230 | ||
4e434314 | 1231 | if (!m->proc_swaps) { |
4e85aff4 LP |
1232 | if (!(m->proc_swaps = fopen("/proc/swaps", "re"))) |
1233 | return -errno; | |
07b0b134 | 1234 | |
4e434314 LP |
1235 | m->swap_watch.type = WATCH_SWAP; |
1236 | m->swap_watch.fd = fileno(m->proc_swaps); | |
1237 | ||
1238 | zero(ev); | |
1239 | ev.events = EPOLLPRI; | |
1240 | ev.data.ptr = &m->swap_watch; | |
1241 | ||
1242 | if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->swap_watch.fd, &ev) < 0) | |
1243 | return -errno; | |
1244 | } | |
1245 | ||
e04aad61 LP |
1246 | /* We rely on mount.c to load /etc/fstab for us */ |
1247 | ||
1248 | if ((r = swap_load_proc_swaps(m, false)) < 0) | |
07b0b134 ML |
1249 | swap_shutdown(m); |
1250 | ||
1251 | return r; | |
1252 | } | |
1253 | ||
fdf20a31 | 1254 | static void swap_reset_failed(Unit *u) { |
5632e374 LP |
1255 | Swap *s = SWAP(u); |
1256 | ||
1257 | assert(s); | |
1258 | ||
fdf20a31 | 1259 | if (s->state == SWAP_FAILED) |
5632e374 | 1260 | swap_set_state(s, SWAP_DEAD); |
e04aad61 LP |
1261 | |
1262 | s->failure = false; | |
5632e374 LP |
1263 | } |
1264 | ||
8a0867d6 LP |
1265 | static int swap_kill(Unit *u, KillWho who, KillMode mode, int signo, DBusError *error) { |
1266 | Swap *s = SWAP(u); | |
1267 | int r = 0; | |
1268 | Set *pid_set = NULL; | |
1269 | ||
1270 | assert(s); | |
1271 | ||
1272 | if (who == KILL_MAIN) { | |
1273 | dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "Swap units have no main processes"); | |
1274 | return -EINVAL; | |
1275 | } | |
1276 | ||
1277 | if (s->control_pid <= 0 && who == KILL_CONTROL) { | |
1278 | dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "No control process to kill"); | |
1279 | return -ENOENT; | |
1280 | } | |
1281 | ||
1282 | if (s->control_pid > 0) | |
1283 | if (kill(mode == KILL_PROCESS_GROUP ? -s->control_pid : s->control_pid, signo) < 0) | |
1284 | r = -errno; | |
1285 | ||
1286 | if (mode == KILL_CONTROL_GROUP) { | |
1287 | int q; | |
1288 | ||
1289 | if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func))) | |
1290 | return -ENOMEM; | |
1291 | ||
1292 | /* Exclude the control pid from being killed via the cgroup */ | |
1293 | if (s->control_pid > 0) | |
1294 | if ((q = set_put(pid_set, LONG_TO_PTR(s->control_pid))) < 0) { | |
1295 | r = q; | |
1296 | goto finish; | |
1297 | } | |
1298 | ||
1299 | if ((q = cgroup_bonding_kill_list(s->meta.cgroup_bondings, signo, pid_set)) < 0) | |
1300 | if (r != -EAGAIN && r != -ESRCH && r != -ENOENT) | |
1301 | r = q; | |
1302 | } | |
1303 | ||
1304 | finish: | |
1305 | if (pid_set) | |
1306 | set_free(pid_set); | |
1307 | ||
1308 | return r; | |
1309 | } | |
1310 | ||
5632e374 LP |
1311 | static const char* const swap_state_table[_SWAP_STATE_MAX] = { |
1312 | [SWAP_DEAD] = "dead", | |
e04aad61 | 1313 | [SWAP_ACTIVATING] = "activating", |
5632e374 | 1314 | [SWAP_ACTIVE] = "active", |
e04aad61 LP |
1315 | [SWAP_DEACTIVATING] = "deactivating", |
1316 | [SWAP_ACTIVATING_SIGTERM] = "activating-sigterm", | |
1317 | [SWAP_ACTIVATING_SIGKILL] = "activating-sigkill", | |
1318 | [SWAP_DEACTIVATING_SIGTERM] = "deactivating-sigterm", | |
1319 | [SWAP_DEACTIVATING_SIGKILL] = "deactivating-sigkill", | |
fdf20a31 | 1320 | [SWAP_FAILED] = "failed" |
5632e374 LP |
1321 | }; |
1322 | ||
1323 | DEFINE_STRING_TABLE_LOOKUP(swap_state, SwapState); | |
1324 | ||
e04aad61 LP |
1325 | static const char* const swap_exec_command_table[_SWAP_EXEC_COMMAND_MAX] = { |
1326 | [SWAP_EXEC_ACTIVATE] = "ExecActivate", | |
1327 | [SWAP_EXEC_DEACTIVATE] = "ExecDeactivate", | |
1328 | }; | |
1329 | ||
1330 | DEFINE_STRING_TABLE_LOOKUP(swap_exec_command, SwapExecCommand); | |
1331 | ||
07b0b134 ML |
1332 | const UnitVTable swap_vtable = { |
1333 | .suffix = ".swap", | |
1334 | ||
e04aad61 | 1335 | .no_alias = true, |
07b0b134 | 1336 | .no_instances = true, |
6e620bec | 1337 | .no_isolate = true, |
9e58ff9c | 1338 | .show_status = true, |
07b0b134 | 1339 | |
4e85aff4 | 1340 | .init = swap_init, |
07b0b134 | 1341 | .load = swap_load, |
6e620bec | 1342 | .done = swap_done, |
07b0b134 ML |
1343 | |
1344 | .coldplug = swap_coldplug, | |
1345 | ||
1346 | .dump = swap_dump, | |
1347 | ||
1348 | .start = swap_start, | |
1349 | .stop = swap_stop, | |
1350 | ||
8a0867d6 LP |
1351 | .kill = swap_kill, |
1352 | ||
07b0b134 ML |
1353 | .serialize = swap_serialize, |
1354 | .deserialize_item = swap_deserialize_item, | |
1355 | ||
1356 | .active_state = swap_active_state, | |
1357 | .sub_state_to_string = swap_sub_state_to_string, | |
1358 | ||
1359 | .check_gc = swap_check_gc, | |
1360 | ||
e04aad61 LP |
1361 | .sigchld_event = swap_sigchld_event, |
1362 | .timer_event = swap_timer_event, | |
1363 | ||
1364 | .reset_failed = swap_reset_failed, | |
1365 | ||
c4e2ceae | 1366 | .bus_interface = "org.freedesktop.systemd1.Swap", |
07b0b134 | 1367 | .bus_message_handler = bus_swap_message_handler, |
c4e2ceae | 1368 | .bus_invalidating_properties = bus_swap_invalidating_properties, |
07b0b134 | 1369 | |
e04aad61 | 1370 | .following = swap_following, |
6210e7fc | 1371 | .following_set = swap_following_set, |
5632e374 | 1372 | |
6e620bec LP |
1373 | .enumerate = swap_enumerate, |
1374 | .shutdown = swap_shutdown | |
07b0b134 | 1375 | }; |