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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" |
9a57c629 | 39 | #include "exit-status.h" |
07b0b134 ML |
40 | |
41 | static const UnitActiveState state_translation_table[_SWAP_STATE_MAX] = { | |
42 | [SWAP_DEAD] = UNIT_INACTIVE, | |
e04aad61 | 43 | [SWAP_ACTIVATING] = UNIT_ACTIVATING, |
07b0b134 | 44 | [SWAP_ACTIVE] = UNIT_ACTIVE, |
e04aad61 LP |
45 | [SWAP_DEACTIVATING] = UNIT_DEACTIVATING, |
46 | [SWAP_ACTIVATING_SIGTERM] = UNIT_DEACTIVATING, | |
47 | [SWAP_ACTIVATING_SIGKILL] = UNIT_DEACTIVATING, | |
48 | [SWAP_DEACTIVATING_SIGTERM] = UNIT_DEACTIVATING, | |
49 | [SWAP_DEACTIVATING_SIGKILL] = UNIT_DEACTIVATING, | |
fdf20a31 | 50 | [SWAP_FAILED] = UNIT_FAILED |
07b0b134 ML |
51 | }; |
52 | ||
e04aad61 LP |
53 | static void swap_unset_proc_swaps(Swap *s) { |
54 | Swap *first; | |
55 | ||
56 | assert(s); | |
57 | ||
58 | if (!s->parameters_proc_swaps.what) | |
59 | return; | |
60 | ||
61 | /* Remove this unit from the chain of swaps which share the | |
62 | * same kernel swap device. */ | |
63 | ||
64 | first = hashmap_get(s->meta.manager->swaps_by_proc_swaps, s->parameters_proc_swaps.what); | |
65 | LIST_REMOVE(Swap, same_proc_swaps, first, s); | |
66 | ||
67 | if (first) | |
68 | hashmap_remove_and_replace(s->meta.manager->swaps_by_proc_swaps, s->parameters_proc_swaps.what, first->parameters_proc_swaps.what, first); | |
69 | else | |
70 | hashmap_remove(s->meta.manager->swaps_by_proc_swaps, s->parameters_proc_swaps.what); | |
71 | ||
72 | free(s->parameters_proc_swaps.what); | |
73 | s->parameters_proc_swaps.what = NULL; | |
74 | } | |
75 | ||
76 | static void swap_init(Unit *u) { | |
6e620bec LP |
77 | Swap *s = SWAP(u); |
78 | ||
79 | assert(s); | |
4e85aff4 | 80 | assert(s->meta.load_state == UNIT_STUB); |
6e620bec | 81 | |
e04aad61 LP |
82 | s->timeout_usec = DEFAULT_TIMEOUT_USEC; |
83 | ||
84 | exec_context_init(&s->exec_context); | |
0a494f1f | 85 | s->exec_context.std_output = EXEC_OUTPUT_KMSG; |
e04aad61 | 86 | |
4e85aff4 | 87 | s->parameters_etc_fstab.priority = s->parameters_proc_swaps.priority = s->parameters_fragment.priority = -1; |
e04aad61 LP |
88 | |
89 | s->timer_watch.type = WATCH_INVALID; | |
90 | ||
91 | s->control_command_id = _MOUNT_EXEC_COMMAND_INVALID; | |
92 | } | |
93 | ||
94 | static void swap_unwatch_control_pid(Swap *s) { | |
95 | assert(s); | |
96 | ||
97 | if (s->control_pid <= 0) | |
98 | return; | |
99 | ||
100 | unit_unwatch_pid(UNIT(s), s->control_pid); | |
101 | s->control_pid = 0; | |
6e620bec LP |
102 | } |
103 | ||
4e85aff4 LP |
104 | static void swap_done(Unit *u) { |
105 | Swap *s = SWAP(u); | |
07b0b134 | 106 | |
4e85aff4 | 107 | assert(s); |
07b0b134 | 108 | |
e04aad61 LP |
109 | swap_unset_proc_swaps(s); |
110 | ||
4e85aff4 | 111 | free(s->what); |
e04aad61 LP |
112 | s->what = NULL; |
113 | ||
4e85aff4 | 114 | free(s->parameters_etc_fstab.what); |
4e85aff4 | 115 | free(s->parameters_fragment.what); |
e04aad61 LP |
116 | s->parameters_etc_fstab.what = s->parameters_fragment.what = NULL; |
117 | ||
118 | exec_context_done(&s->exec_context); | |
119 | exec_command_done_array(s->exec_command, _SWAP_EXEC_COMMAND_MAX); | |
120 | s->control_command = NULL; | |
121 | ||
122 | swap_unwatch_control_pid(s); | |
123 | ||
124 | unit_unwatch_timer(u, &s->timer_watch); | |
07b0b134 ML |
125 | } |
126 | ||
6e2ef85b LP |
127 | int swap_add_one_mount_link(Swap *s, Mount *m) { |
128 | int r; | |
129 | ||
130 | assert(s); | |
131 | assert(m); | |
132 | ||
133 | if (s->meta.load_state != UNIT_LOADED || | |
134 | m->meta.load_state != UNIT_LOADED) | |
135 | return 0; | |
136 | ||
8407a5d0 LP |
137 | if (is_device_path(s->what)) |
138 | return 0; | |
139 | ||
6e2ef85b LP |
140 | if (!path_startswith(s->what, m->where)) |
141 | return 0; | |
142 | ||
2c966c03 | 143 | if ((r = unit_add_two_dependencies(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true)) < 0) |
6e2ef85b LP |
144 | return r; |
145 | ||
146 | return 0; | |
147 | } | |
148 | ||
149 | static int swap_add_mount_links(Swap *s) { | |
150 | Meta *other; | |
151 | int r; | |
152 | ||
153 | assert(s); | |
154 | ||
155 | LIST_FOREACH(units_per_type, other, s->meta.manager->units_per_type[UNIT_MOUNT]) | |
156 | if ((r = swap_add_one_mount_link(s, (Mount*) other)) < 0) | |
157 | return r; | |
158 | ||
159 | return 0; | |
160 | } | |
161 | ||
07b0b134 | 162 | static int swap_add_target_links(Swap *s) { |
07b0b134 | 163 | Unit *tu; |
4e85aff4 | 164 | SwapParameters *p; |
07b0b134 ML |
165 | int r; |
166 | ||
4e85aff4 LP |
167 | assert(s); |
168 | ||
169 | if (s->from_fragment) | |
170 | p = &s->parameters_fragment; | |
171 | else if (s->from_etc_fstab) | |
172 | p = &s->parameters_etc_fstab; | |
173 | else | |
174 | return 0; | |
175 | ||
398ef8ba | 176 | if ((r = manager_load_unit(s->meta.manager, SPECIAL_SWAP_TARGET, NULL, NULL, &tu)) < 0) |
07b0b134 ML |
177 | return r; |
178 | ||
81bf310e LP |
179 | if (!p->noauto && |
180 | (p->handle || s->meta.manager->swap_auto) && | |
510051fc | 181 | s->from_etc_fstab && |
81bf310e | 182 | s->meta.manager->running_as == MANAGER_SYSTEM) |
6e2ef85b LP |
183 | if ((r = unit_add_dependency(tu, UNIT_WANTS, UNIT(s), true)) < 0) |
184 | return r; | |
07b0b134 ML |
185 | |
186 | return unit_add_dependency(UNIT(s), UNIT_BEFORE, tu, true); | |
187 | } | |
188 | ||
173a8d04 LP |
189 | static int swap_add_device_links(Swap *s) { |
190 | SwapParameters *p; | |
191 | ||
192 | assert(s); | |
193 | ||
194 | if (!s->what) | |
195 | return 0; | |
196 | ||
197 | if (s->from_fragment) | |
198 | p = &s->parameters_fragment; | |
199 | else if (s->from_etc_fstab) | |
200 | p = &s->parameters_etc_fstab; | |
201 | else | |
202 | return 0; | |
203 | ||
cfcfd4ae LP |
204 | if (is_device_path(s->what)) |
205 | return unit_add_node_link(UNIT(s), s->what, | |
206 | !p->noauto && p->nofail && | |
207 | s->meta.manager->running_as == MANAGER_SYSTEM); | |
208 | else | |
209 | /* File based swap devices need to be ordered after | |
210 | * remount-rootfs.service, since they might need a | |
211 | * writable file system. */ | |
212 | return unit_add_dependency_by_name(UNIT(s), UNIT_AFTER, SPECIAL_REMOUNT_ROOTFS_SERVICE, NULL, true); | |
173a8d04 LP |
213 | } |
214 | ||
2edd4434 LP |
215 | static int swap_add_default_dependencies(Swap *s) { |
216 | int r; | |
217 | ||
218 | assert(s); | |
219 | ||
220 | if (s->meta.manager->running_as == MANAGER_SYSTEM) { | |
221 | ||
ead8e478 | 222 | if ((r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true)) < 0) |
e04aad61 | 223 | return r; |
2edd4434 LP |
224 | } |
225 | ||
226 | return 0; | |
227 | } | |
228 | ||
4e85aff4 LP |
229 | static int swap_verify(Swap *s) { |
230 | bool b; | |
231 | char *e; | |
232 | ||
4cd1fbcc | 233 | if (s->meta.load_state != UNIT_LOADED) |
4e85aff4 LP |
234 | return 0; |
235 | ||
236 | if (!(e = unit_name_from_path(s->what, ".swap"))) | |
237 | return -ENOMEM; | |
238 | ||
239 | b = unit_has_name(UNIT(s), e); | |
240 | free(e); | |
241 | ||
242 | if (!b) { | |
4cd1fbcc | 243 | log_error("%s: Value of \"What\" and unit name do not match, not loading.\n", s->meta.id); |
4e85aff4 LP |
244 | return -EINVAL; |
245 | } | |
246 | ||
e04aad61 LP |
247 | if (s->exec_context.pam_name && s->exec_context.kill_mode != KILL_CONTROL_GROUP) { |
248 | log_error("%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing.", s->meta.id); | |
249 | return -EINVAL; | |
250 | } | |
251 | ||
4e85aff4 LP |
252 | return 0; |
253 | } | |
254 | ||
07b0b134 ML |
255 | static int swap_load(Unit *u) { |
256 | int r; | |
257 | Swap *s = SWAP(u); | |
258 | ||
259 | assert(s); | |
260 | assert(u->meta.load_state == UNIT_STUB); | |
261 | ||
262 | /* Load a .swap file */ | |
263 | if ((r = unit_load_fragment_and_dropin_optional(u)) < 0) | |
264 | return r; | |
265 | ||
266 | if (u->meta.load_state == UNIT_LOADED) { | |
4e85aff4 LP |
267 | |
268 | if (s->meta.fragment_path) | |
269 | s->from_fragment = true; | |
270 | ||
271 | if (!s->what) { | |
272 | if (s->parameters_fragment.what) | |
273 | s->what = strdup(s->parameters_fragment.what); | |
274 | else if (s->parameters_etc_fstab.what) | |
275 | s->what = strdup(s->parameters_etc_fstab.what); | |
276 | else if (s->parameters_proc_swaps.what) | |
277 | s->what = strdup(s->parameters_proc_swaps.what); | |
278 | else | |
279 | s->what = unit_name_to_path(u->meta.id); | |
280 | ||
281 | if (!s->what) | |
07b0b134 | 282 | return -ENOMEM; |
4e85aff4 | 283 | } |
07b0b134 ML |
284 | |
285 | path_kill_slashes(s->what); | |
286 | ||
4e85aff4 LP |
287 | if (!s->meta.description) |
288 | if ((r = unit_set_description(u, s->what)) < 0) | |
289 | return r; | |
290 | ||
173a8d04 | 291 | if ((r = swap_add_device_links(s)) < 0) |
07b0b134 ML |
292 | return r; |
293 | ||
6e2ef85b LP |
294 | if ((r = swap_add_mount_links(s)) < 0) |
295 | return r; | |
07b0b134 ML |
296 | |
297 | if ((r = swap_add_target_links(s)) < 0) | |
298 | return r; | |
2edd4434 | 299 | |
d686d8a9 | 300 | if ((r = unit_add_default_cgroups(u)) < 0) |
f1a1cd64 LP |
301 | return r; |
302 | ||
2edd4434 LP |
303 | if (s->meta.default_dependencies) |
304 | if ((r = swap_add_default_dependencies(s)) < 0) | |
305 | return r; | |
07b0b134 ML |
306 | } |
307 | ||
308 | return swap_verify(s); | |
309 | } | |
310 | ||
4e85aff4 LP |
311 | int swap_add_one( |
312 | Manager *m, | |
313 | const char *what, | |
e04aad61 | 314 | const char *what_proc_swaps, |
4e85aff4 LP |
315 | int priority, |
316 | bool noauto, | |
173a8d04 | 317 | bool nofail, |
4e85aff4 | 318 | bool handle, |
e04aad61 LP |
319 | bool set_flags) { |
320 | ||
4e85aff4 | 321 | Unit *u = NULL; |
e04aad61 | 322 | char *e = NULL, *wp = NULL; |
2c7c6144 | 323 | bool delete = false; |
07b0b134 | 324 | int r; |
4e85aff4 LP |
325 | SwapParameters *p; |
326 | ||
327 | assert(m); | |
328 | assert(what); | |
07b0b134 ML |
329 | |
330 | if (!(e = unit_name_from_path(what, ".swap"))) | |
331 | return -ENOMEM; | |
332 | ||
e04aad61 LP |
333 | u = manager_get_unit(m, e); |
334 | ||
335 | if (what_proc_swaps && | |
336 | u && | |
337 | SWAP(u)->from_proc_swaps && | |
338 | !path_equal(SWAP(u)->parameters_proc_swaps.what, what_proc_swaps)) | |
339 | return -EEXIST; | |
4e85aff4 LP |
340 | |
341 | if (!u) { | |
07b0b134 ML |
342 | delete = true; |
343 | ||
344 | if (!(u = unit_new(m))) { | |
345 | free(e); | |
346 | return -ENOMEM; | |
347 | } | |
e04aad61 LP |
348 | |
349 | if ((r = unit_add_name(u, e)) < 0) | |
350 | goto fail; | |
351 | ||
352 | if (!(SWAP(u)->what = strdup(what))) { | |
353 | r = -ENOMEM; | |
354 | goto fail; | |
355 | } | |
356 | ||
357 | unit_add_to_load_queue(u); | |
4e85aff4 LP |
358 | } else |
359 | delete = false; | |
07b0b134 | 360 | |
e04aad61 LP |
361 | if (what_proc_swaps) { |
362 | Swap *first; | |
07b0b134 | 363 | |
4e85aff4 | 364 | p = &SWAP(u)->parameters_proc_swaps; |
e04aad61 LP |
365 | |
366 | if (!p->what) { | |
367 | if (!(wp = strdup(what_proc_swaps))) { | |
368 | r = -ENOMEM; | |
369 | goto fail; | |
370 | } | |
371 | ||
372 | if (!m->swaps_by_proc_swaps) | |
373 | if (!(m->swaps_by_proc_swaps = hashmap_new(string_hash_func, string_compare_func))) { | |
374 | r = -ENOMEM; | |
375 | goto fail; | |
376 | } | |
377 | ||
378 | free(p->what); | |
379 | p->what = wp; | |
380 | ||
381 | first = hashmap_get(m->swaps_by_proc_swaps, wp); | |
382 | LIST_PREPEND(Swap, same_proc_swaps, first, SWAP(u)); | |
383 | ||
384 | if ((r = hashmap_replace(m->swaps_by_proc_swaps, wp, first)) < 0) | |
385 | goto fail; | |
386 | } | |
387 | ||
388 | if (set_flags) { | |
389 | SWAP(u)->is_active = true; | |
390 | SWAP(u)->just_activated = !SWAP(u)->from_proc_swaps; | |
391 | } | |
392 | ||
4e85aff4 | 393 | SWAP(u)->from_proc_swaps = true; |
e04aad61 | 394 | |
4e85aff4 LP |
395 | } else { |
396 | p = &SWAP(u)->parameters_etc_fstab; | |
e04aad61 LP |
397 | |
398 | if (!(wp = strdup(what))) { | |
399 | r = -ENOMEM; | |
400 | goto fail; | |
401 | } | |
402 | ||
403 | free(p->what); | |
404 | p->what = wp; | |
405 | ||
4e85aff4 LP |
406 | SWAP(u)->from_etc_fstab = true; |
407 | } | |
07b0b134 | 408 | |
4e85aff4 LP |
409 | p->priority = priority; |
410 | p->noauto = noauto; | |
173a8d04 | 411 | p->nofail = nofail; |
4e85aff4 | 412 | p->handle = handle; |
07b0b134 | 413 | |
4e85aff4 | 414 | unit_add_to_dbus_queue(u); |
07b0b134 | 415 | |
4e85aff4 | 416 | free(e); |
07b0b134 ML |
417 | |
418 | return 0; | |
419 | ||
420 | fail: | |
e04aad61 LP |
421 | log_warning("Failed to load swap unit: %s", strerror(-r)); |
422 | ||
423 | free(wp); | |
4e85aff4 LP |
424 | free(e); |
425 | ||
426 | if (delete && u) | |
07b0b134 ML |
427 | unit_free(u); |
428 | ||
4e85aff4 | 429 | return r; |
07b0b134 ML |
430 | } |
431 | ||
e04aad61 LP |
432 | static int swap_process_new_swap(Manager *m, const char *device, int prio, bool set_flags) { |
433 | struct stat st; | |
434 | int r = 0, k; | |
435 | ||
436 | assert(m); | |
437 | ||
438 | if (stat(device, &st) >= 0 && S_ISBLK(st.st_mode)) { | |
439 | struct udev_device *d; | |
440 | const char *dn; | |
441 | struct udev_list_entry *item = NULL, *first = NULL; | |
442 | ||
443 | /* So this is a proper swap device. Create swap units | |
444 | * for all names this swap device is known under */ | |
445 | ||
446 | if (!(d = udev_device_new_from_devnum(m->udev, 'b', st.st_rdev))) | |
447 | return -ENOMEM; | |
448 | ||
449 | if ((dn = udev_device_get_devnode(d))) | |
450 | r = swap_add_one(m, dn, device, prio, false, false, false, set_flags); | |
451 | ||
452 | /* Add additional units for all symlinks */ | |
453 | first = udev_device_get_devlinks_list_entry(d); | |
454 | udev_list_entry_foreach(item, first) { | |
455 | const char *p; | |
456 | ||
457 | /* Don't bother with the /dev/block links */ | |
458 | p = udev_list_entry_get_name(item); | |
459 | ||
460 | if (path_startswith(p, "/dev/block/")) | |
461 | continue; | |
462 | ||
463 | if (stat(p, &st) >= 0) | |
464 | if ((!S_ISBLK(st.st_mode)) || st.st_rdev != udev_device_get_devnum(d)) | |
465 | continue; | |
466 | ||
467 | if ((k = swap_add_one(m, p, device, prio, false, false, false, set_flags)) < 0) | |
468 | r = k; | |
469 | } | |
470 | ||
471 | udev_device_unref(d); | |
472 | } | |
473 | ||
474 | if ((k = swap_add_one(m, device, device, prio, false, false, false, set_flags)) < 0) | |
475 | r = k; | |
476 | ||
477 | return r; | |
478 | } | |
479 | ||
07b0b134 ML |
480 | static void swap_set_state(Swap *s, SwapState state) { |
481 | SwapState old_state; | |
e04aad61 | 482 | |
07b0b134 ML |
483 | assert(s); |
484 | ||
485 | old_state = s->state; | |
486 | s->state = state; | |
487 | ||
e04aad61 LP |
488 | if (state != SWAP_ACTIVATING && |
489 | state != SWAP_ACTIVATING_SIGTERM && | |
490 | state != SWAP_ACTIVATING_SIGKILL && | |
491 | state != SWAP_DEACTIVATING && | |
492 | state != SWAP_DEACTIVATING_SIGTERM && | |
493 | state != SWAP_DEACTIVATING_SIGKILL) { | |
494 | unit_unwatch_timer(UNIT(s), &s->timer_watch); | |
495 | swap_unwatch_control_pid(s); | |
496 | s->control_command = NULL; | |
497 | s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; | |
498 | } | |
499 | ||
07b0b134 ML |
500 | if (state != old_state) |
501 | log_debug("%s changed %s -> %s", | |
4cd1fbcc | 502 | s->meta.id, |
07b0b134 ML |
503 | swap_state_to_string(old_state), |
504 | swap_state_to_string(state)); | |
505 | ||
e2f3b44c | 506 | unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], true); |
07b0b134 ML |
507 | } |
508 | ||
509 | static int swap_coldplug(Unit *u) { | |
510 | Swap *s = SWAP(u); | |
511 | SwapState new_state = SWAP_DEAD; | |
e04aad61 | 512 | int r; |
07b0b134 ML |
513 | |
514 | assert(s); | |
515 | assert(s->state == SWAP_DEAD); | |
516 | ||
517 | if (s->deserialized_state != s->state) | |
518 | new_state = s->deserialized_state; | |
4e85aff4 | 519 | else if (s->from_proc_swaps) |
07b0b134 ML |
520 | new_state = SWAP_ACTIVE; |
521 | ||
e04aad61 LP |
522 | if (new_state != s->state) { |
523 | ||
524 | if (new_state == SWAP_ACTIVATING || | |
525 | new_state == SWAP_ACTIVATING_SIGTERM || | |
526 | new_state == SWAP_ACTIVATING_SIGKILL || | |
527 | new_state == SWAP_DEACTIVATING || | |
528 | new_state == SWAP_DEACTIVATING_SIGTERM || | |
529 | new_state == SWAP_DEACTIVATING_SIGKILL) { | |
530 | ||
531 | if (s->control_pid <= 0) | |
532 | return -EBADMSG; | |
533 | ||
534 | if ((r = unit_watch_pid(UNIT(s), s->control_pid)) < 0) | |
535 | return r; | |
536 | ||
537 | if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0) | |
538 | return r; | |
539 | } | |
540 | ||
4e85aff4 | 541 | swap_set_state(s, new_state); |
e04aad61 | 542 | } |
07b0b134 ML |
543 | |
544 | return 0; | |
545 | } | |
546 | ||
547 | static void swap_dump(Unit *u, FILE *f, const char *prefix) { | |
548 | Swap *s = SWAP(u); | |
4e85aff4 | 549 | SwapParameters *p; |
07b0b134 ML |
550 | |
551 | assert(s); | |
4e85aff4 LP |
552 | assert(f); |
553 | ||
554 | if (s->from_proc_swaps) | |
555 | p = &s->parameters_proc_swaps; | |
556 | else if (s->from_fragment) | |
557 | p = &s->parameters_fragment; | |
558 | else | |
559 | p = &s->parameters_etc_fstab; | |
07b0b134 ML |
560 | |
561 | fprintf(f, | |
4e85aff4 | 562 | "%sSwap State: %s\n" |
07b0b134 ML |
563 | "%sWhat: %s\n" |
564 | "%sPriority: %i\n" | |
4e85aff4 | 565 | "%sNoAuto: %s\n" |
173a8d04 | 566 | "%sNoFail: %s\n" |
4e85aff4 LP |
567 | "%sHandle: %s\n" |
568 | "%sFrom /etc/fstab: %s\n" | |
569 | "%sFrom /proc/swaps: %s\n" | |
570 | "%sFrom fragment: %s\n", | |
07b0b134 ML |
571 | prefix, swap_state_to_string(s->state), |
572 | prefix, s->what, | |
4e85aff4 LP |
573 | prefix, p->priority, |
574 | prefix, yes_no(p->noauto), | |
173a8d04 | 575 | prefix, yes_no(p->nofail), |
4e85aff4 LP |
576 | prefix, yes_no(p->handle), |
577 | prefix, yes_no(s->from_etc_fstab), | |
578 | prefix, yes_no(s->from_proc_swaps), | |
579 | prefix, yes_no(s->from_fragment)); | |
e04aad61 LP |
580 | |
581 | if (s->control_pid > 0) | |
582 | fprintf(f, | |
583 | "%sControl PID: %lu\n", | |
584 | prefix, (unsigned long) s->control_pid); | |
585 | ||
586 | exec_context_dump(&s->exec_context, f, prefix); | |
587 | } | |
588 | ||
589 | static int swap_spawn(Swap *s, ExecCommand *c, pid_t *_pid) { | |
590 | pid_t pid; | |
591 | int r; | |
592 | ||
593 | assert(s); | |
594 | assert(c); | |
595 | assert(_pid); | |
596 | ||
597 | if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0) | |
598 | goto fail; | |
599 | ||
600 | if ((r = exec_spawn(c, | |
601 | NULL, | |
602 | &s->exec_context, | |
603 | NULL, 0, | |
604 | s->meta.manager->environment, | |
605 | true, | |
606 | true, | |
607 | true, | |
608 | s->meta.manager->confirm_spawn, | |
609 | s->meta.cgroup_bondings, | |
610 | &pid)) < 0) | |
611 | goto fail; | |
612 | ||
613 | if ((r = unit_watch_pid(UNIT(s), pid)) < 0) | |
614 | /* FIXME: we need to do something here */ | |
615 | goto fail; | |
616 | ||
617 | *_pid = pid; | |
618 | ||
619 | return 0; | |
620 | ||
621 | fail: | |
622 | unit_unwatch_timer(UNIT(s), &s->timer_watch); | |
623 | ||
624 | return r; | |
07b0b134 ML |
625 | } |
626 | ||
627 | static void swap_enter_dead(Swap *s, bool success) { | |
628 | assert(s); | |
629 | ||
e04aad61 LP |
630 | if (!success) |
631 | s->failure = true; | |
632 | ||
633 | swap_set_state(s, s->failure ? SWAP_FAILED : SWAP_DEAD); | |
07b0b134 ML |
634 | } |
635 | ||
e04aad61 LP |
636 | static void swap_enter_active(Swap *s, bool success) { |
637 | assert(s); | |
638 | ||
639 | if (!success) | |
640 | s->failure = true; | |
641 | ||
642 | swap_set_state(s, SWAP_ACTIVE); | |
643 | } | |
644 | ||
645 | static void swap_enter_signal(Swap *s, SwapState state, bool success) { | |
07b0b134 | 646 | int r; |
e04aad61 LP |
647 | Set *pid_set = NULL; |
648 | bool wait_for_exit = false; | |
07b0b134 ML |
649 | |
650 | assert(s); | |
e04aad61 LP |
651 | |
652 | if (!success) | |
653 | s->failure = true; | |
654 | ||
655 | if (s->exec_context.kill_mode != KILL_NONE) { | |
656 | int sig = (state == SWAP_ACTIVATING_SIGTERM || | |
657 | state == SWAP_DEACTIVATING_SIGTERM) ? s->exec_context.kill_signal : SIGKILL; | |
658 | ||
659 | if (s->control_pid > 0) { | |
660 | if (kill(s->exec_context.kill_mode == KILL_PROCESS_GROUP ? | |
661 | -s->control_pid : | |
662 | s->control_pid, sig) < 0 && errno != ESRCH) | |
663 | ||
664 | log_warning("Failed to kill control process %li: %m", (long) s->control_pid); | |
665 | else | |
666 | wait_for_exit = true; | |
667 | } | |
668 | ||
669 | if (s->exec_context.kill_mode == KILL_CONTROL_GROUP) { | |
670 | ||
671 | if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func))) { | |
672 | r = -ENOMEM; | |
673 | goto fail; | |
674 | } | |
675 | ||
676 | /* Exclude the control pid from being killed via the cgroup */ | |
677 | if (s->control_pid > 0) | |
678 | if ((r = set_put(pid_set, LONG_TO_PTR(s->control_pid))) < 0) | |
679 | goto fail; | |
680 | ||
681 | if ((r = cgroup_bonding_kill_list(s->meta.cgroup_bondings, sig, pid_set)) < 0) { | |
682 | if (r != -EAGAIN && r != -ESRCH && r != -ENOENT) | |
683 | log_warning("Failed to kill control group: %s", strerror(-r)); | |
684 | } else if (r > 0) | |
685 | wait_for_exit = true; | |
686 | ||
687 | set_free(pid_set); | |
688 | } | |
689 | } | |
690 | ||
691 | if (wait_for_exit) { | |
692 | if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0) | |
693 | goto fail; | |
694 | ||
695 | swap_set_state(s, state); | |
696 | } else | |
697 | swap_enter_dead(s, true); | |
698 | ||
699 | return; | |
700 | ||
701 | fail: | |
702 | log_warning("%s failed to kill processes: %s", s->meta.id, strerror(-r)); | |
703 | ||
704 | swap_enter_dead(s, false); | |
705 | ||
706 | if (pid_set) | |
707 | set_free(pid_set); | |
708 | } | |
709 | ||
710 | static void swap_enter_activating(Swap *s) { | |
711 | int r, priority; | |
712 | ||
713 | assert(s); | |
714 | ||
715 | s->control_command_id = SWAP_EXEC_ACTIVATE; | |
716 | s->control_command = s->exec_command + SWAP_EXEC_ACTIVATE; | |
07b0b134 | 717 | |
4e85aff4 LP |
718 | if (s->from_fragment) |
719 | priority = s->parameters_fragment.priority; | |
720 | else if (s->from_etc_fstab) | |
721 | priority = s->parameters_etc_fstab.priority; | |
e04aad61 LP |
722 | else |
723 | priority = -1; | |
4e85aff4 | 724 | |
e04aad61 LP |
725 | if (priority >= 0) { |
726 | char p[LINE_MAX]; | |
07b0b134 | 727 | |
e04aad61 LP |
728 | snprintf(p, sizeof(p), "%i", priority); |
729 | char_array_0(p); | |
07b0b134 | 730 | |
e04aad61 LP |
731 | r = exec_command_set( |
732 | s->control_command, | |
733 | "/sbin/swapon", | |
734 | "-p", | |
735 | p, | |
736 | s->what, | |
737 | NULL); | |
738 | } else | |
739 | r = exec_command_set( | |
740 | s->control_command, | |
741 | "/sbin/swapon", | |
742 | s->what, | |
743 | NULL); | |
744 | ||
745 | if (r < 0) | |
746 | goto fail; | |
747 | ||
748 | swap_unwatch_control_pid(s); | |
749 | ||
750 | if ((r = swap_spawn(s, s->control_command, &s->control_pid)) < 0) | |
751 | goto fail; | |
752 | ||
753 | swap_set_state(s, SWAP_ACTIVATING); | |
754 | ||
755 | return; | |
756 | ||
757 | fail: | |
758 | log_warning("%s failed to run 'swapon' task: %s", s->meta.id, strerror(-r)); | |
759 | swap_enter_dead(s, false); | |
760 | } | |
761 | ||
762 | static void swap_enter_deactivating(Swap *s, bool success) { | |
763 | int r; | |
764 | ||
765 | assert(s); | |
766 | ||
767 | if (!success) | |
768 | s->failure = true; | |
769 | ||
770 | s->control_command_id = SWAP_EXEC_DEACTIVATE; | |
771 | s->control_command = s->exec_command + SWAP_EXEC_DEACTIVATE; | |
772 | ||
773 | if ((r = exec_command_set( | |
774 | s->control_command, | |
775 | "/sbin/swapoff", | |
776 | s->what, | |
777 | NULL)) < 0) | |
778 | goto fail; | |
779 | ||
780 | swap_unwatch_control_pid(s); | |
781 | ||
782 | if ((r = swap_spawn(s, s->control_command, &s->control_pid)) < 0) | |
783 | goto fail; | |
784 | ||
785 | swap_set_state(s, SWAP_DEACTIVATING); | |
786 | ||
787 | return; | |
788 | ||
789 | fail: | |
790 | log_warning("%s failed to run 'swapoff' task: %s", s->meta.id, strerror(-r)); | |
791 | swap_enter_active(s, false); | |
792 | } | |
793 | ||
794 | static int swap_start(Unit *u) { | |
795 | Swap *s = SWAP(u); | |
796 | ||
797 | assert(s); | |
798 | ||
799 | /* We cannot fulfill this request right now, try again later | |
800 | * please! */ | |
801 | ||
802 | if (s->state == SWAP_DEACTIVATING || | |
803 | s->state == SWAP_DEACTIVATING_SIGTERM || | |
804 | s->state == SWAP_DEACTIVATING_SIGKILL || | |
805 | s->state == SWAP_ACTIVATING_SIGTERM || | |
806 | s->state == SWAP_ACTIVATING_SIGKILL) | |
807 | return -EAGAIN; | |
808 | ||
809 | if (s->state == SWAP_ACTIVATING) | |
810 | return 0; | |
811 | ||
812 | assert(s->state == SWAP_DEAD || s->state == SWAP_FAILED); | |
813 | ||
814 | s->failure = false; | |
815 | swap_enter_activating(s); | |
07b0b134 ML |
816 | return 0; |
817 | } | |
818 | ||
819 | static int swap_stop(Unit *u) { | |
820 | Swap *s = SWAP(u); | |
07b0b134 ML |
821 | |
822 | assert(s); | |
823 | ||
e04aad61 LP |
824 | if (s->state == SWAP_DEACTIVATING || |
825 | s->state == SWAP_DEACTIVATING_SIGTERM || | |
826 | s->state == SWAP_DEACTIVATING_SIGKILL || | |
827 | s->state == SWAP_ACTIVATING_SIGTERM || | |
828 | s->state == SWAP_ACTIVATING_SIGKILL) | |
829 | return 0; | |
07b0b134 | 830 | |
e04aad61 LP |
831 | assert(s->state == SWAP_ACTIVATING || |
832 | s->state == SWAP_ACTIVE); | |
07b0b134 | 833 | |
e04aad61 | 834 | swap_enter_deactivating(s, true); |
07b0b134 ML |
835 | return 0; |
836 | } | |
837 | ||
838 | static int swap_serialize(Unit *u, FILE *f, FDSet *fds) { | |
839 | Swap *s = SWAP(u); | |
840 | ||
841 | assert(s); | |
842 | assert(f); | |
843 | assert(fds); | |
844 | ||
845 | unit_serialize_item(u, f, "state", swap_state_to_string(s->state)); | |
e04aad61 LP |
846 | unit_serialize_item(u, f, "failure", yes_no(s->failure)); |
847 | ||
848 | if (s->control_pid > 0) | |
849 | unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) s->control_pid); | |
850 | ||
851 | if (s->control_command_id >= 0) | |
852 | unit_serialize_item(u, f, "control-command", swap_exec_command_to_string(s->control_command_id)); | |
07b0b134 ML |
853 | |
854 | return 0; | |
855 | } | |
856 | ||
857 | static int swap_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
858 | Swap *s = SWAP(u); | |
859 | ||
860 | assert(s); | |
861 | assert(fds); | |
862 | ||
863 | if (streq(key, "state")) { | |
864 | SwapState state; | |
865 | ||
866 | if ((state = swap_state_from_string(value)) < 0) | |
867 | log_debug("Failed to parse state value %s", value); | |
868 | else | |
869 | s->deserialized_state = state; | |
e04aad61 LP |
870 | } else if (streq(key, "failure")) { |
871 | int b; | |
872 | ||
873 | if ((b = parse_boolean(value)) < 0) | |
874 | log_debug("Failed to parse failure value %s", value); | |
875 | else | |
876 | s->failure = b || s->failure; | |
877 | ||
878 | } else if (streq(key, "control-pid")) { | |
879 | pid_t pid; | |
880 | ||
881 | if (parse_pid(value, &pid) < 0) | |
882 | log_debug("Failed to parse control-pid value %s", value); | |
883 | else | |
884 | s->control_pid = pid; | |
885 | ||
886 | } else if (streq(key, "control-command")) { | |
887 | SwapExecCommand id; | |
888 | ||
889 | if ((id = swap_exec_command_from_string(value)) < 0) | |
890 | log_debug("Failed to parse exec-command value %s", value); | |
891 | else { | |
892 | s->control_command_id = id; | |
893 | s->control_command = s->exec_command + id; | |
894 | } | |
895 | ||
07b0b134 ML |
896 | } else |
897 | log_debug("Unknown serialization key '%s'", key); | |
898 | ||
899 | return 0; | |
900 | } | |
901 | ||
902 | static UnitActiveState swap_active_state(Unit *u) { | |
903 | assert(u); | |
904 | ||
905 | return state_translation_table[SWAP(u)->state]; | |
906 | } | |
907 | ||
908 | static const char *swap_sub_state_to_string(Unit *u) { | |
909 | assert(u); | |
910 | ||
911 | return swap_state_to_string(SWAP(u)->state); | |
912 | } | |
913 | ||
914 | static bool swap_check_gc(Unit *u) { | |
915 | Swap *s = SWAP(u); | |
916 | ||
917 | assert(s); | |
918 | ||
4e85aff4 | 919 | return s->from_etc_fstab || s->from_proc_swaps; |
07b0b134 ML |
920 | } |
921 | ||
e04aad61 LP |
922 | static void swap_sigchld_event(Unit *u, pid_t pid, int code, int status) { |
923 | Swap *s = SWAP(u); | |
924 | bool success; | |
925 | ||
926 | assert(s); | |
927 | assert(pid >= 0); | |
928 | ||
929 | if (pid != s->control_pid) | |
930 | return; | |
931 | ||
932 | s->control_pid = 0; | |
933 | ||
934 | success = is_clean_exit(code, status); | |
935 | s->failure = s->failure || !success; | |
936 | ||
937 | if (s->control_command) { | |
938 | exec_status_exit(&s->control_command->exec_status, pid, code, status, s->exec_context.utmp_id); | |
939 | s->control_command = NULL; | |
940 | s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; | |
941 | } | |
942 | ||
943 | log_full(success ? LOG_DEBUG : LOG_NOTICE, | |
944 | "%s swap process exited, code=%s status=%i", u->meta.id, sigchld_code_to_string(code), status); | |
945 | ||
946 | switch (s->state) { | |
947 | ||
948 | case SWAP_ACTIVATING: | |
949 | case SWAP_ACTIVATING_SIGTERM: | |
950 | case SWAP_ACTIVATING_SIGKILL: | |
951 | ||
952 | if (success) | |
953 | swap_enter_active(s, true); | |
954 | else | |
955 | swap_enter_dead(s, false); | |
956 | break; | |
957 | ||
958 | case SWAP_DEACTIVATING: | |
959 | case SWAP_DEACTIVATING_SIGKILL: | |
960 | case SWAP_DEACTIVATING_SIGTERM: | |
961 | ||
962 | if (success) | |
963 | swap_enter_dead(s, true); | |
964 | else | |
965 | swap_enter_dead(s, false); | |
966 | break; | |
967 | ||
968 | default: | |
969 | assert_not_reached("Uh, control process died at wrong time."); | |
970 | } | |
971 | ||
972 | /* Notify clients about changed exit status */ | |
973 | unit_add_to_dbus_queue(u); | |
974 | ||
975 | /* Request a reload of /proc/swaps, so that following units | |
976 | * can follow our state change */ | |
977 | u->meta.manager->request_reload = true; | |
978 | } | |
979 | ||
980 | static void swap_timer_event(Unit *u, uint64_t elapsed, Watch *w) { | |
981 | Swap *s = SWAP(u); | |
982 | ||
983 | assert(s); | |
984 | assert(elapsed == 1); | |
985 | assert(w == &s->timer_watch); | |
986 | ||
987 | switch (s->state) { | |
988 | ||
989 | case SWAP_ACTIVATING: | |
990 | log_warning("%s activation timed out. Stopping.", u->meta.id); | |
991 | swap_enter_signal(s, SWAP_ACTIVATING_SIGTERM, false); | |
992 | break; | |
993 | ||
994 | case SWAP_DEACTIVATING: | |
995 | log_warning("%s deactivation timed out. Stopping.", u->meta.id); | |
996 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGTERM, false); | |
997 | break; | |
998 | ||
999 | case SWAP_ACTIVATING_SIGTERM: | |
ba035df2 LP |
1000 | if (s->exec_context.send_sigkill) { |
1001 | log_warning("%s activation timed out. Killing.", u->meta.id); | |
1002 | swap_enter_signal(s, SWAP_ACTIVATING_SIGKILL, false); | |
1003 | } else { | |
1004 | log_warning("%s activation timed out. Skipping SIGKILL. Ignoring.", u->meta.id); | |
1005 | swap_enter_dead(s, false); | |
1006 | } | |
e04aad61 LP |
1007 | break; |
1008 | ||
1009 | case SWAP_DEACTIVATING_SIGTERM: | |
ba035df2 LP |
1010 | if (s->exec_context.send_sigkill) { |
1011 | log_warning("%s deactivation timed out. Killing.", u->meta.id); | |
1012 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, false); | |
1013 | } else { | |
1014 | log_warning("%s deactivation timed out. Skipping SIGKILL. Ignoring.", u->meta.id); | |
1015 | swap_enter_dead(s, false); | |
1016 | } | |
e04aad61 LP |
1017 | break; |
1018 | ||
1019 | case SWAP_ACTIVATING_SIGKILL: | |
1020 | case SWAP_DEACTIVATING_SIGKILL: | |
1021 | log_warning("%s swap process still around after SIGKILL. Ignoring.", u->meta.id); | |
1022 | swap_enter_dead(s, false); | |
1023 | break; | |
1024 | ||
1025 | default: | |
1026 | assert_not_reached("Timeout at wrong time."); | |
1027 | } | |
1028 | } | |
1029 | ||
1030 | static int swap_load_proc_swaps(Manager *m, bool set_flags) { | |
1031 | unsigned i; | |
1032 | int r = 0; | |
1033 | ||
1034 | assert(m); | |
1035 | ||
07b0b134 | 1036 | rewind(m->proc_swaps); |
bab45044 | 1037 | |
4e85aff4 | 1038 | (void) fscanf(m->proc_swaps, "%*s %*s %*s %*s %*s\n"); |
07b0b134 | 1039 | |
e04aad61 | 1040 | for (i = 1;; i++) { |
07b0b134 ML |
1041 | char *dev = NULL, *d; |
1042 | int prio = 0, k; | |
1043 | ||
4e85aff4 | 1044 | if ((k = fscanf(m->proc_swaps, |
e04aad61 LP |
1045 | "%ms " /* device/file */ |
1046 | "%*s " /* type of swap */ | |
1047 | "%*s " /* swap size */ | |
1048 | "%*s " /* used */ | |
4e85aff4 LP |
1049 | "%i\n", /* priority */ |
1050 | &dev, &prio)) != 2) { | |
07b0b134 | 1051 | |
07b0b134 | 1052 | if (k == EOF) |
4e85aff4 | 1053 | break; |
07b0b134 | 1054 | |
e04aad61 | 1055 | log_warning("Failed to parse /proc/swaps:%u.", i); |
07b0b134 | 1056 | free(dev); |
e04aad61 | 1057 | continue; |
07b0b134 | 1058 | } |
07b0b134 | 1059 | |
4e85aff4 | 1060 | d = cunescape(dev); |
07b0b134 | 1061 | free(dev); |
4e85aff4 LP |
1062 | |
1063 | if (!d) | |
1064 | return -ENOMEM; | |
1065 | ||
e04aad61 | 1066 | k = swap_process_new_swap(m, d, prio, set_flags); |
07b0b134 ML |
1067 | free(d); |
1068 | ||
1069 | if (k < 0) | |
e04aad61 | 1070 | r = k; |
07b0b134 ML |
1071 | } |
1072 | ||
e04aad61 LP |
1073 | return r; |
1074 | } | |
1075 | ||
1076 | int swap_dispatch_reload(Manager *m) { | |
4e434314 | 1077 | /* This function should go as soon as the kernel properly notifies us */ |
e04aad61 LP |
1078 | |
1079 | if (_likely_(!m->request_reload)) | |
1080 | return 0; | |
1081 | ||
1082 | m->request_reload = false; | |
1083 | ||
4e434314 LP |
1084 | return swap_fd_event(m, EPOLLPRI); |
1085 | } | |
1086 | ||
1087 | int swap_fd_event(Manager *m, int events) { | |
1088 | Meta *meta; | |
1089 | int r; | |
1090 | ||
1091 | assert(m); | |
1092 | assert(events & EPOLLPRI); | |
1093 | ||
bd40a2d8 | 1094 | if ((r = swap_load_proc_swaps(m, true)) < 0) { |
e04aad61 LP |
1095 | log_error("Failed to reread /proc/swaps: %s", strerror(-r)); |
1096 | ||
1097 | /* Reset flags, just in case, for late calls */ | |
1098 | LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_SWAP]) { | |
1099 | Swap *swap = (Swap*) meta; | |
1100 | ||
1101 | swap->is_active = swap->just_activated = false; | |
1102 | } | |
1103 | ||
1104 | return 0; | |
1105 | } | |
1106 | ||
1107 | manager_dispatch_load_queue(m); | |
1108 | ||
1109 | LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_SWAP]) { | |
1110 | Swap *swap = (Swap*) meta; | |
1111 | ||
1112 | if (!swap->is_active) { | |
1113 | /* This has just been deactivated */ | |
1114 | ||
1115 | swap->from_proc_swaps = false; | |
1116 | swap_unset_proc_swaps(swap); | |
1117 | ||
1118 | switch (swap->state) { | |
1119 | ||
1120 | case SWAP_ACTIVE: | |
1121 | swap_enter_dead(swap, true); | |
1122 | break; | |
1123 | ||
1124 | default: | |
1125 | swap_set_state(swap, swap->state); | |
1126 | break; | |
1127 | } | |
1128 | ||
1129 | } else if (swap->just_activated) { | |
1130 | ||
1131 | /* New swap entry */ | |
1132 | ||
1133 | switch (swap->state) { | |
1134 | ||
1135 | case SWAP_DEAD: | |
1136 | case SWAP_FAILED: | |
1137 | swap_enter_active(swap, true); | |
1138 | break; | |
1139 | ||
1140 | default: | |
1141 | /* Nothing really changed, but let's | |
1142 | * issue an notification call | |
1143 | * nonetheless, in case somebody is | |
1144 | * waiting for this. */ | |
1145 | swap_set_state(swap, swap->state); | |
1146 | break; | |
1147 | } | |
1148 | } | |
1149 | ||
1150 | /* Reset the flags for later calls */ | |
1151 | swap->is_active = swap->just_activated = false; | |
1152 | } | |
1153 | ||
1154 | return 1; | |
1155 | } | |
1156 | ||
1157 | static Unit *swap_following(Unit *u) { | |
1158 | Swap *s = SWAP(u); | |
1159 | Swap *other, *first = NULL; | |
1160 | ||
1161 | assert(s); | |
1162 | ||
1163 | if (streq_ptr(s->what, s->parameters_proc_swaps.what)) | |
1164 | return NULL; | |
1165 | ||
1166 | /* Make everybody follow the unit that's named after the swap | |
1167 | * device in the kernel */ | |
1168 | ||
1169 | LIST_FOREACH_AFTER(same_proc_swaps, other, s) | |
1170 | if (streq_ptr(other->what, other->parameters_proc_swaps.what)) | |
1171 | return UNIT(other); | |
1172 | ||
1173 | LIST_FOREACH_BEFORE(same_proc_swaps, other, s) { | |
1174 | if (streq_ptr(other->what, other->parameters_proc_swaps.what)) | |
1175 | return UNIT(other); | |
1176 | ||
1177 | first = other; | |
1178 | } | |
1179 | ||
1180 | return UNIT(first); | |
07b0b134 ML |
1181 | } |
1182 | ||
6210e7fc LP |
1183 | static int swap_following_set(Unit *u, Set **_set) { |
1184 | Swap *s = SWAP(u); | |
1185 | Swap *other; | |
1186 | Set *set; | |
1187 | int r; | |
1188 | ||
1189 | assert(s); | |
1190 | assert(_set); | |
1191 | ||
1192 | if (LIST_JUST_US(same_proc_swaps, s)) { | |
1193 | *_set = NULL; | |
1194 | return 0; | |
1195 | } | |
1196 | ||
1197 | if (!(set = set_new(NULL, NULL))) | |
1198 | return -ENOMEM; | |
1199 | ||
1200 | LIST_FOREACH_AFTER(same_proc_swaps, other, s) | |
1201 | if ((r = set_put(set, other)) < 0) | |
1202 | goto fail; | |
1203 | ||
1204 | LIST_FOREACH_BEFORE(same_proc_swaps, other, s) | |
1205 | if ((r = set_put(set, other)) < 0) | |
1206 | goto fail; | |
1207 | ||
1208 | *_set = set; | |
1209 | return 1; | |
1210 | ||
1211 | fail: | |
1212 | set_free(set); | |
1213 | return r; | |
1214 | } | |
1215 | ||
07b0b134 ML |
1216 | static void swap_shutdown(Manager *m) { |
1217 | assert(m); | |
1218 | ||
1219 | if (m->proc_swaps) { | |
1220 | fclose(m->proc_swaps); | |
1221 | m->proc_swaps = NULL; | |
1222 | } | |
e04aad61 LP |
1223 | |
1224 | hashmap_free(m->swaps_by_proc_swaps); | |
1225 | m->swaps_by_proc_swaps = NULL; | |
07b0b134 ML |
1226 | } |
1227 | ||
07b0b134 ML |
1228 | static int swap_enumerate(Manager *m) { |
1229 | int r; | |
4e434314 | 1230 | struct epoll_event ev; |
07b0b134 ML |
1231 | assert(m); |
1232 | ||
4e434314 | 1233 | if (!m->proc_swaps) { |
4e85aff4 LP |
1234 | if (!(m->proc_swaps = fopen("/proc/swaps", "re"))) |
1235 | return -errno; | |
07b0b134 | 1236 | |
4e434314 LP |
1237 | m->swap_watch.type = WATCH_SWAP; |
1238 | m->swap_watch.fd = fileno(m->proc_swaps); | |
1239 | ||
1240 | zero(ev); | |
1241 | ev.events = EPOLLPRI; | |
1242 | ev.data.ptr = &m->swap_watch; | |
1243 | ||
1244 | if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->swap_watch.fd, &ev) < 0) | |
1245 | return -errno; | |
1246 | } | |
1247 | ||
e04aad61 LP |
1248 | /* We rely on mount.c to load /etc/fstab for us */ |
1249 | ||
1250 | if ((r = swap_load_proc_swaps(m, false)) < 0) | |
07b0b134 ML |
1251 | swap_shutdown(m); |
1252 | ||
1253 | return r; | |
1254 | } | |
1255 | ||
fdf20a31 | 1256 | static void swap_reset_failed(Unit *u) { |
5632e374 LP |
1257 | Swap *s = SWAP(u); |
1258 | ||
1259 | assert(s); | |
1260 | ||
fdf20a31 | 1261 | if (s->state == SWAP_FAILED) |
5632e374 | 1262 | swap_set_state(s, SWAP_DEAD); |
e04aad61 LP |
1263 | |
1264 | s->failure = false; | |
5632e374 LP |
1265 | } |
1266 | ||
8a0867d6 LP |
1267 | static int swap_kill(Unit *u, KillWho who, KillMode mode, int signo, DBusError *error) { |
1268 | Swap *s = SWAP(u); | |
1269 | int r = 0; | |
1270 | Set *pid_set = NULL; | |
1271 | ||
1272 | assert(s); | |
1273 | ||
1274 | if (who == KILL_MAIN) { | |
1275 | dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "Swap units have no main processes"); | |
1276 | return -EINVAL; | |
1277 | } | |
1278 | ||
1279 | if (s->control_pid <= 0 && who == KILL_CONTROL) { | |
1280 | dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "No control process to kill"); | |
1281 | return -ENOENT; | |
1282 | } | |
1283 | ||
1284 | if (s->control_pid > 0) | |
1285 | if (kill(mode == KILL_PROCESS_GROUP ? -s->control_pid : s->control_pid, signo) < 0) | |
1286 | r = -errno; | |
1287 | ||
1288 | if (mode == KILL_CONTROL_GROUP) { | |
1289 | int q; | |
1290 | ||
1291 | if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func))) | |
1292 | return -ENOMEM; | |
1293 | ||
1294 | /* Exclude the control pid from being killed via the cgroup */ | |
1295 | if (s->control_pid > 0) | |
1296 | if ((q = set_put(pid_set, LONG_TO_PTR(s->control_pid))) < 0) { | |
1297 | r = q; | |
1298 | goto finish; | |
1299 | } | |
1300 | ||
1301 | if ((q = cgroup_bonding_kill_list(s->meta.cgroup_bondings, signo, pid_set)) < 0) | |
1302 | if (r != -EAGAIN && r != -ESRCH && r != -ENOENT) | |
1303 | r = q; | |
1304 | } | |
1305 | ||
1306 | finish: | |
1307 | if (pid_set) | |
1308 | set_free(pid_set); | |
1309 | ||
1310 | return r; | |
1311 | } | |
1312 | ||
5632e374 LP |
1313 | static const char* const swap_state_table[_SWAP_STATE_MAX] = { |
1314 | [SWAP_DEAD] = "dead", | |
e04aad61 | 1315 | [SWAP_ACTIVATING] = "activating", |
5632e374 | 1316 | [SWAP_ACTIVE] = "active", |
e04aad61 LP |
1317 | [SWAP_DEACTIVATING] = "deactivating", |
1318 | [SWAP_ACTIVATING_SIGTERM] = "activating-sigterm", | |
1319 | [SWAP_ACTIVATING_SIGKILL] = "activating-sigkill", | |
1320 | [SWAP_DEACTIVATING_SIGTERM] = "deactivating-sigterm", | |
1321 | [SWAP_DEACTIVATING_SIGKILL] = "deactivating-sigkill", | |
fdf20a31 | 1322 | [SWAP_FAILED] = "failed" |
5632e374 LP |
1323 | }; |
1324 | ||
1325 | DEFINE_STRING_TABLE_LOOKUP(swap_state, SwapState); | |
1326 | ||
e04aad61 LP |
1327 | static const char* const swap_exec_command_table[_SWAP_EXEC_COMMAND_MAX] = { |
1328 | [SWAP_EXEC_ACTIVATE] = "ExecActivate", | |
1329 | [SWAP_EXEC_DEACTIVATE] = "ExecDeactivate", | |
1330 | }; | |
1331 | ||
1332 | DEFINE_STRING_TABLE_LOOKUP(swap_exec_command, SwapExecCommand); | |
1333 | ||
07b0b134 ML |
1334 | const UnitVTable swap_vtable = { |
1335 | .suffix = ".swap", | |
1336 | ||
e04aad61 | 1337 | .no_alias = true, |
07b0b134 | 1338 | .no_instances = true, |
6e620bec | 1339 | .no_isolate = true, |
9e58ff9c | 1340 | .show_status = true, |
07b0b134 | 1341 | |
4e85aff4 | 1342 | .init = swap_init, |
07b0b134 | 1343 | .load = swap_load, |
6e620bec | 1344 | .done = swap_done, |
07b0b134 ML |
1345 | |
1346 | .coldplug = swap_coldplug, | |
1347 | ||
1348 | .dump = swap_dump, | |
1349 | ||
1350 | .start = swap_start, | |
1351 | .stop = swap_stop, | |
1352 | ||
8a0867d6 LP |
1353 | .kill = swap_kill, |
1354 | ||
07b0b134 ML |
1355 | .serialize = swap_serialize, |
1356 | .deserialize_item = swap_deserialize_item, | |
1357 | ||
1358 | .active_state = swap_active_state, | |
1359 | .sub_state_to_string = swap_sub_state_to_string, | |
1360 | ||
1361 | .check_gc = swap_check_gc, | |
1362 | ||
e04aad61 LP |
1363 | .sigchld_event = swap_sigchld_event, |
1364 | .timer_event = swap_timer_event, | |
1365 | ||
1366 | .reset_failed = swap_reset_failed, | |
1367 | ||
c4e2ceae | 1368 | .bus_interface = "org.freedesktop.systemd1.Swap", |
07b0b134 | 1369 | .bus_message_handler = bus_swap_message_handler, |
c4e2ceae | 1370 | .bus_invalidating_properties = bus_swap_invalidating_properties, |
07b0b134 | 1371 | |
e04aad61 | 1372 | .following = swap_following, |
6210e7fc | 1373 | .following_set = swap_following_set, |
5632e374 | 1374 | |
6e620bec LP |
1375 | .enumerate = swap_enumerate, |
1376 | .shutdown = swap_shutdown | |
07b0b134 | 1377 | }; |