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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" |
f6a6225e | 40 | #include "def.h" |
07b0b134 ML |
41 | |
42 | static const UnitActiveState state_translation_table[_SWAP_STATE_MAX] = { | |
43 | [SWAP_DEAD] = UNIT_INACTIVE, | |
e04aad61 | 44 | [SWAP_ACTIVATING] = UNIT_ACTIVATING, |
07b0b134 | 45 | [SWAP_ACTIVE] = UNIT_ACTIVE, |
e04aad61 LP |
46 | [SWAP_DEACTIVATING] = UNIT_DEACTIVATING, |
47 | [SWAP_ACTIVATING_SIGTERM] = UNIT_DEACTIVATING, | |
48 | [SWAP_ACTIVATING_SIGKILL] = UNIT_DEACTIVATING, | |
49 | [SWAP_DEACTIVATING_SIGTERM] = UNIT_DEACTIVATING, | |
50 | [SWAP_DEACTIVATING_SIGKILL] = UNIT_DEACTIVATING, | |
fdf20a31 | 51 | [SWAP_FAILED] = UNIT_FAILED |
07b0b134 ML |
52 | }; |
53 | ||
e04aad61 LP |
54 | static void swap_unset_proc_swaps(Swap *s) { |
55 | Swap *first; | |
56 | ||
57 | assert(s); | |
58 | ||
59 | if (!s->parameters_proc_swaps.what) | |
60 | return; | |
61 | ||
62 | /* Remove this unit from the chain of swaps which share the | |
63 | * same kernel swap device. */ | |
64 | ||
65 | first = hashmap_get(s->meta.manager->swaps_by_proc_swaps, s->parameters_proc_swaps.what); | |
66 | LIST_REMOVE(Swap, same_proc_swaps, first, s); | |
67 | ||
68 | if (first) | |
69 | hashmap_remove_and_replace(s->meta.manager->swaps_by_proc_swaps, s->parameters_proc_swaps.what, first->parameters_proc_swaps.what, first); | |
70 | else | |
71 | hashmap_remove(s->meta.manager->swaps_by_proc_swaps, s->parameters_proc_swaps.what); | |
72 | ||
73 | free(s->parameters_proc_swaps.what); | |
74 | s->parameters_proc_swaps.what = NULL; | |
75 | } | |
76 | ||
f6cebb3b | 77 | static void swap_init(Unit *u) { |
6e620bec LP |
78 | Swap *s = SWAP(u); |
79 | ||
80 | assert(s); | |
4e85aff4 | 81 | assert(s->meta.load_state == UNIT_STUB); |
6e620bec | 82 | |
e04aad61 LP |
83 | s->timeout_usec = DEFAULT_TIMEOUT_USEC; |
84 | ||
85 | exec_context_init(&s->exec_context); | |
f6cebb3b MS |
86 | s->exec_context.std_output = u->meta.manager->default_std_output; |
87 | s->exec_context.std_error = u->meta.manager->default_std_error; | |
e04aad61 | 88 | |
4e85aff4 | 89 | s->parameters_etc_fstab.priority = s->parameters_proc_swaps.priority = s->parameters_fragment.priority = -1; |
e04aad61 LP |
90 | |
91 | s->timer_watch.type = WATCH_INVALID; | |
92 | ||
93 | s->control_command_id = _MOUNT_EXEC_COMMAND_INVALID; | |
c8f4d764 LP |
94 | |
95 | s->meta.ignore_on_isolate = true; | |
e04aad61 LP |
96 | } |
97 | ||
98 | static void swap_unwatch_control_pid(Swap *s) { | |
99 | assert(s); | |
100 | ||
101 | if (s->control_pid <= 0) | |
102 | return; | |
103 | ||
104 | unit_unwatch_pid(UNIT(s), s->control_pid); | |
105 | s->control_pid = 0; | |
6e620bec LP |
106 | } |
107 | ||
4e85aff4 LP |
108 | static void swap_done(Unit *u) { |
109 | Swap *s = SWAP(u); | |
07b0b134 | 110 | |
4e85aff4 | 111 | assert(s); |
07b0b134 | 112 | |
e04aad61 LP |
113 | swap_unset_proc_swaps(s); |
114 | ||
4e85aff4 | 115 | free(s->what); |
e04aad61 LP |
116 | s->what = NULL; |
117 | ||
4e85aff4 | 118 | free(s->parameters_etc_fstab.what); |
4e85aff4 | 119 | free(s->parameters_fragment.what); |
e04aad61 LP |
120 | s->parameters_etc_fstab.what = s->parameters_fragment.what = NULL; |
121 | ||
122 | exec_context_done(&s->exec_context); | |
123 | exec_command_done_array(s->exec_command, _SWAP_EXEC_COMMAND_MAX); | |
124 | s->control_command = NULL; | |
125 | ||
126 | swap_unwatch_control_pid(s); | |
127 | ||
128 | unit_unwatch_timer(u, &s->timer_watch); | |
07b0b134 ML |
129 | } |
130 | ||
6e2ef85b LP |
131 | int swap_add_one_mount_link(Swap *s, Mount *m) { |
132 | int r; | |
133 | ||
134 | assert(s); | |
135 | assert(m); | |
136 | ||
137 | if (s->meta.load_state != UNIT_LOADED || | |
138 | m->meta.load_state != UNIT_LOADED) | |
139 | return 0; | |
140 | ||
8407a5d0 LP |
141 | if (is_device_path(s->what)) |
142 | return 0; | |
143 | ||
6e2ef85b LP |
144 | if (!path_startswith(s->what, m->where)) |
145 | return 0; | |
146 | ||
2c966c03 | 147 | if ((r = unit_add_two_dependencies(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true)) < 0) |
6e2ef85b LP |
148 | return r; |
149 | ||
150 | return 0; | |
151 | } | |
152 | ||
153 | static int swap_add_mount_links(Swap *s) { | |
154 | Meta *other; | |
155 | int r; | |
156 | ||
157 | assert(s); | |
158 | ||
ab5c3e3f | 159 | LIST_FOREACH(units_by_type, other, s->meta.manager->units_by_type[UNIT_MOUNT]) |
6e2ef85b LP |
160 | if ((r = swap_add_one_mount_link(s, (Mount*) other)) < 0) |
161 | return r; | |
162 | ||
163 | return 0; | |
164 | } | |
165 | ||
07b0b134 | 166 | static int swap_add_target_links(Swap *s) { |
07b0b134 | 167 | Unit *tu; |
4e85aff4 | 168 | SwapParameters *p; |
07b0b134 ML |
169 | int r; |
170 | ||
4e85aff4 LP |
171 | assert(s); |
172 | ||
173 | if (s->from_fragment) | |
174 | p = &s->parameters_fragment; | |
175 | else if (s->from_etc_fstab) | |
176 | p = &s->parameters_etc_fstab; | |
177 | else | |
178 | return 0; | |
179 | ||
398ef8ba | 180 | if ((r = manager_load_unit(s->meta.manager, SPECIAL_SWAP_TARGET, NULL, NULL, &tu)) < 0) |
07b0b134 ML |
181 | return r; |
182 | ||
81bf310e | 183 | if (!p->noauto && |
85385610 | 184 | !p->nofail && |
81bf310e | 185 | (p->handle || s->meta.manager->swap_auto) && |
510051fc | 186 | s->from_etc_fstab && |
81bf310e | 187 | s->meta.manager->running_as == MANAGER_SYSTEM) |
6e2ef85b LP |
188 | if ((r = unit_add_dependency(tu, UNIT_WANTS, UNIT(s), true)) < 0) |
189 | return r; | |
07b0b134 ML |
190 | |
191 | return unit_add_dependency(UNIT(s), UNIT_BEFORE, tu, true); | |
192 | } | |
193 | ||
173a8d04 LP |
194 | static int swap_add_device_links(Swap *s) { |
195 | SwapParameters *p; | |
196 | ||
197 | assert(s); | |
198 | ||
199 | if (!s->what) | |
200 | return 0; | |
201 | ||
202 | if (s->from_fragment) | |
203 | p = &s->parameters_fragment; | |
204 | else if (s->from_etc_fstab) | |
205 | p = &s->parameters_etc_fstab; | |
206 | else | |
207 | return 0; | |
208 | ||
cfcfd4ae LP |
209 | if (is_device_path(s->what)) |
210 | return unit_add_node_link(UNIT(s), s->what, | |
211 | !p->noauto && p->nofail && | |
212 | s->meta.manager->running_as == MANAGER_SYSTEM); | |
213 | else | |
214 | /* File based swap devices need to be ordered after | |
215 | * remount-rootfs.service, since they might need a | |
216 | * writable file system. */ | |
217 | return unit_add_dependency_by_name(UNIT(s), UNIT_AFTER, SPECIAL_REMOUNT_ROOTFS_SERVICE, NULL, true); | |
173a8d04 LP |
218 | } |
219 | ||
2edd4434 LP |
220 | static int swap_add_default_dependencies(Swap *s) { |
221 | int r; | |
222 | ||
223 | assert(s); | |
224 | ||
225 | if (s->meta.manager->running_as == MANAGER_SYSTEM) { | |
226 | ||
ead8e478 | 227 | if ((r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true)) < 0) |
e04aad61 | 228 | return r; |
2edd4434 LP |
229 | } |
230 | ||
231 | return 0; | |
232 | } | |
233 | ||
4e85aff4 LP |
234 | static int swap_verify(Swap *s) { |
235 | bool b; | |
236 | char *e; | |
237 | ||
4cd1fbcc | 238 | if (s->meta.load_state != UNIT_LOADED) |
4e85aff4 LP |
239 | return 0; |
240 | ||
241 | if (!(e = unit_name_from_path(s->what, ".swap"))) | |
242 | return -ENOMEM; | |
243 | ||
244 | b = unit_has_name(UNIT(s), e); | |
245 | free(e); | |
246 | ||
247 | if (!b) { | |
4cd1fbcc | 248 | log_error("%s: Value of \"What\" and unit name do not match, not loading.\n", s->meta.id); |
4e85aff4 LP |
249 | return -EINVAL; |
250 | } | |
251 | ||
e04aad61 LP |
252 | if (s->exec_context.pam_name && s->exec_context.kill_mode != KILL_CONTROL_GROUP) { |
253 | log_error("%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing.", s->meta.id); | |
254 | return -EINVAL; | |
255 | } | |
256 | ||
4e85aff4 LP |
257 | return 0; |
258 | } | |
259 | ||
07b0b134 ML |
260 | static int swap_load(Unit *u) { |
261 | int r; | |
262 | Swap *s = SWAP(u); | |
263 | ||
264 | assert(s); | |
265 | assert(u->meta.load_state == UNIT_STUB); | |
266 | ||
267 | /* Load a .swap file */ | |
268 | if ((r = unit_load_fragment_and_dropin_optional(u)) < 0) | |
269 | return r; | |
270 | ||
271 | if (u->meta.load_state == UNIT_LOADED) { | |
27abbe82 LP |
272 | if ((r = unit_add_exec_dependencies(u, &s->exec_context)) < 0) |
273 | return r; | |
4e85aff4 LP |
274 | |
275 | if (s->meta.fragment_path) | |
276 | s->from_fragment = true; | |
277 | ||
278 | if (!s->what) { | |
279 | if (s->parameters_fragment.what) | |
280 | s->what = strdup(s->parameters_fragment.what); | |
281 | else if (s->parameters_etc_fstab.what) | |
282 | s->what = strdup(s->parameters_etc_fstab.what); | |
283 | else if (s->parameters_proc_swaps.what) | |
284 | s->what = strdup(s->parameters_proc_swaps.what); | |
285 | else | |
286 | s->what = unit_name_to_path(u->meta.id); | |
287 | ||
288 | if (!s->what) | |
07b0b134 | 289 | return -ENOMEM; |
4e85aff4 | 290 | } |
07b0b134 ML |
291 | |
292 | path_kill_slashes(s->what); | |
293 | ||
4e85aff4 LP |
294 | if (!s->meta.description) |
295 | if ((r = unit_set_description(u, s->what)) < 0) | |
296 | return r; | |
297 | ||
173a8d04 | 298 | if ((r = swap_add_device_links(s)) < 0) |
07b0b134 ML |
299 | return r; |
300 | ||
6e2ef85b LP |
301 | if ((r = swap_add_mount_links(s)) < 0) |
302 | return r; | |
07b0b134 ML |
303 | |
304 | if ((r = swap_add_target_links(s)) < 0) | |
305 | return r; | |
2edd4434 | 306 | |
d686d8a9 | 307 | if ((r = unit_add_default_cgroups(u)) < 0) |
f1a1cd64 LP |
308 | return r; |
309 | ||
2edd4434 LP |
310 | if (s->meta.default_dependencies) |
311 | if ((r = swap_add_default_dependencies(s)) < 0) | |
312 | return r; | |
07b0b134 ML |
313 | } |
314 | ||
315 | return swap_verify(s); | |
316 | } | |
317 | ||
4e85aff4 LP |
318 | int swap_add_one( |
319 | Manager *m, | |
320 | const char *what, | |
e04aad61 | 321 | const char *what_proc_swaps, |
4e85aff4 LP |
322 | int priority, |
323 | bool noauto, | |
173a8d04 | 324 | bool nofail, |
4e85aff4 | 325 | bool handle, |
e04aad61 LP |
326 | bool set_flags) { |
327 | ||
4e85aff4 | 328 | Unit *u = NULL; |
e04aad61 | 329 | char *e = NULL, *wp = NULL; |
2c7c6144 | 330 | bool delete = false; |
07b0b134 | 331 | int r; |
4e85aff4 LP |
332 | SwapParameters *p; |
333 | ||
334 | assert(m); | |
335 | assert(what); | |
07b0b134 | 336 | |
7d17cfbc MS |
337 | e = unit_name_from_path(what, ".swap"); |
338 | if (!e) | |
07b0b134 ML |
339 | return -ENOMEM; |
340 | ||
e04aad61 LP |
341 | u = manager_get_unit(m, e); |
342 | ||
343 | if (what_proc_swaps && | |
344 | u && | |
345 | SWAP(u)->from_proc_swaps && | |
346 | !path_equal(SWAP(u)->parameters_proc_swaps.what, what_proc_swaps)) | |
347 | return -EEXIST; | |
4e85aff4 LP |
348 | |
349 | if (!u) { | |
07b0b134 ML |
350 | delete = true; |
351 | ||
7d17cfbc MS |
352 | u = unit_new(m, sizeof(Swap)); |
353 | if (!u) { | |
07b0b134 ML |
354 | free(e); |
355 | return -ENOMEM; | |
356 | } | |
e04aad61 | 357 | |
7d17cfbc MS |
358 | r = unit_add_name(u, e); |
359 | if (r < 0) | |
e04aad61 LP |
360 | goto fail; |
361 | ||
7d17cfbc MS |
362 | SWAP(u)->what = strdup(what); |
363 | if (!SWAP(u)->what) { | |
e04aad61 LP |
364 | r = -ENOMEM; |
365 | goto fail; | |
366 | } | |
367 | ||
368 | unit_add_to_load_queue(u); | |
4e85aff4 LP |
369 | } else |
370 | delete = false; | |
07b0b134 | 371 | |
e04aad61 LP |
372 | if (what_proc_swaps) { |
373 | Swap *first; | |
07b0b134 | 374 | |
4e85aff4 | 375 | p = &SWAP(u)->parameters_proc_swaps; |
e04aad61 LP |
376 | |
377 | if (!p->what) { | |
378 | if (!(wp = strdup(what_proc_swaps))) { | |
379 | r = -ENOMEM; | |
380 | goto fail; | |
381 | } | |
382 | ||
383 | if (!m->swaps_by_proc_swaps) | |
384 | if (!(m->swaps_by_proc_swaps = hashmap_new(string_hash_func, string_compare_func))) { | |
385 | r = -ENOMEM; | |
386 | goto fail; | |
387 | } | |
388 | ||
389 | free(p->what); | |
390 | p->what = wp; | |
391 | ||
392 | first = hashmap_get(m->swaps_by_proc_swaps, wp); | |
393 | LIST_PREPEND(Swap, same_proc_swaps, first, SWAP(u)); | |
394 | ||
395 | if ((r = hashmap_replace(m->swaps_by_proc_swaps, wp, first)) < 0) | |
396 | goto fail; | |
397 | } | |
398 | ||
399 | if (set_flags) { | |
400 | SWAP(u)->is_active = true; | |
401 | SWAP(u)->just_activated = !SWAP(u)->from_proc_swaps; | |
402 | } | |
403 | ||
4e85aff4 | 404 | SWAP(u)->from_proc_swaps = true; |
e04aad61 | 405 | |
4e85aff4 LP |
406 | } else { |
407 | p = &SWAP(u)->parameters_etc_fstab; | |
e04aad61 LP |
408 | |
409 | if (!(wp = strdup(what))) { | |
410 | r = -ENOMEM; | |
411 | goto fail; | |
412 | } | |
413 | ||
414 | free(p->what); | |
415 | p->what = wp; | |
416 | ||
4e85aff4 LP |
417 | SWAP(u)->from_etc_fstab = true; |
418 | } | |
07b0b134 | 419 | |
4e85aff4 LP |
420 | p->priority = priority; |
421 | p->noauto = noauto; | |
173a8d04 | 422 | p->nofail = nofail; |
4e85aff4 | 423 | p->handle = handle; |
07b0b134 | 424 | |
4e85aff4 | 425 | unit_add_to_dbus_queue(u); |
07b0b134 | 426 | |
4e85aff4 | 427 | free(e); |
07b0b134 ML |
428 | |
429 | return 0; | |
430 | ||
431 | fail: | |
e04aad61 LP |
432 | log_warning("Failed to load swap unit: %s", strerror(-r)); |
433 | ||
434 | free(wp); | |
4e85aff4 LP |
435 | free(e); |
436 | ||
437 | if (delete && u) | |
07b0b134 ML |
438 | unit_free(u); |
439 | ||
4e85aff4 | 440 | return r; |
07b0b134 ML |
441 | } |
442 | ||
e04aad61 LP |
443 | static int swap_process_new_swap(Manager *m, const char *device, int prio, bool set_flags) { |
444 | struct stat st; | |
445 | int r = 0, k; | |
446 | ||
447 | assert(m); | |
448 | ||
449 | if (stat(device, &st) >= 0 && S_ISBLK(st.st_mode)) { | |
450 | struct udev_device *d; | |
451 | const char *dn; | |
452 | struct udev_list_entry *item = NULL, *first = NULL; | |
453 | ||
454 | /* So this is a proper swap device. Create swap units | |
455 | * for all names this swap device is known under */ | |
456 | ||
457 | if (!(d = udev_device_new_from_devnum(m->udev, 'b', st.st_rdev))) | |
458 | return -ENOMEM; | |
459 | ||
460 | if ((dn = udev_device_get_devnode(d))) | |
461 | r = swap_add_one(m, dn, device, prio, false, false, false, set_flags); | |
462 | ||
463 | /* Add additional units for all symlinks */ | |
464 | first = udev_device_get_devlinks_list_entry(d); | |
465 | udev_list_entry_foreach(item, first) { | |
466 | const char *p; | |
467 | ||
468 | /* Don't bother with the /dev/block links */ | |
469 | p = udev_list_entry_get_name(item); | |
470 | ||
471 | if (path_startswith(p, "/dev/block/")) | |
472 | continue; | |
473 | ||
474 | if (stat(p, &st) >= 0) | |
475 | if ((!S_ISBLK(st.st_mode)) || st.st_rdev != udev_device_get_devnum(d)) | |
476 | continue; | |
477 | ||
478 | if ((k = swap_add_one(m, p, device, prio, false, false, false, set_flags)) < 0) | |
479 | r = k; | |
480 | } | |
481 | ||
482 | udev_device_unref(d); | |
483 | } | |
484 | ||
485 | if ((k = swap_add_one(m, device, device, prio, false, false, false, set_flags)) < 0) | |
486 | r = k; | |
487 | ||
488 | return r; | |
489 | } | |
490 | ||
07b0b134 ML |
491 | static void swap_set_state(Swap *s, SwapState state) { |
492 | SwapState old_state; | |
e04aad61 | 493 | |
07b0b134 ML |
494 | assert(s); |
495 | ||
496 | old_state = s->state; | |
497 | s->state = state; | |
498 | ||
e04aad61 LP |
499 | if (state != SWAP_ACTIVATING && |
500 | state != SWAP_ACTIVATING_SIGTERM && | |
501 | state != SWAP_ACTIVATING_SIGKILL && | |
502 | state != SWAP_DEACTIVATING && | |
503 | state != SWAP_DEACTIVATING_SIGTERM && | |
504 | state != SWAP_DEACTIVATING_SIGKILL) { | |
505 | unit_unwatch_timer(UNIT(s), &s->timer_watch); | |
506 | swap_unwatch_control_pid(s); | |
507 | s->control_command = NULL; | |
508 | s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; | |
509 | } | |
510 | ||
07b0b134 ML |
511 | if (state != old_state) |
512 | log_debug("%s changed %s -> %s", | |
4cd1fbcc | 513 | s->meta.id, |
07b0b134 ML |
514 | swap_state_to_string(old_state), |
515 | swap_state_to_string(state)); | |
516 | ||
e2f3b44c | 517 | unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], true); |
07b0b134 ML |
518 | } |
519 | ||
520 | static int swap_coldplug(Unit *u) { | |
521 | Swap *s = SWAP(u); | |
522 | SwapState new_state = SWAP_DEAD; | |
e04aad61 | 523 | int r; |
07b0b134 ML |
524 | |
525 | assert(s); | |
526 | assert(s->state == SWAP_DEAD); | |
527 | ||
528 | if (s->deserialized_state != s->state) | |
529 | new_state = s->deserialized_state; | |
4e85aff4 | 530 | else if (s->from_proc_swaps) |
07b0b134 ML |
531 | new_state = SWAP_ACTIVE; |
532 | ||
e04aad61 LP |
533 | if (new_state != s->state) { |
534 | ||
535 | if (new_state == SWAP_ACTIVATING || | |
536 | new_state == SWAP_ACTIVATING_SIGTERM || | |
537 | new_state == SWAP_ACTIVATING_SIGKILL || | |
538 | new_state == SWAP_DEACTIVATING || | |
539 | new_state == SWAP_DEACTIVATING_SIGTERM || | |
540 | new_state == SWAP_DEACTIVATING_SIGKILL) { | |
541 | ||
542 | if (s->control_pid <= 0) | |
543 | return -EBADMSG; | |
544 | ||
545 | if ((r = unit_watch_pid(UNIT(s), s->control_pid)) < 0) | |
546 | return r; | |
547 | ||
548 | if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0) | |
549 | return r; | |
550 | } | |
551 | ||
4e85aff4 | 552 | swap_set_state(s, new_state); |
e04aad61 | 553 | } |
07b0b134 ML |
554 | |
555 | return 0; | |
556 | } | |
557 | ||
558 | static void swap_dump(Unit *u, FILE *f, const char *prefix) { | |
559 | Swap *s = SWAP(u); | |
4e85aff4 | 560 | SwapParameters *p; |
07b0b134 ML |
561 | |
562 | assert(s); | |
4e85aff4 LP |
563 | assert(f); |
564 | ||
565 | if (s->from_proc_swaps) | |
566 | p = &s->parameters_proc_swaps; | |
567 | else if (s->from_fragment) | |
568 | p = &s->parameters_fragment; | |
569 | else | |
570 | p = &s->parameters_etc_fstab; | |
07b0b134 ML |
571 | |
572 | fprintf(f, | |
4e85aff4 | 573 | "%sSwap State: %s\n" |
07b0b134 ML |
574 | "%sWhat: %s\n" |
575 | "%sPriority: %i\n" | |
4e85aff4 | 576 | "%sNoAuto: %s\n" |
173a8d04 | 577 | "%sNoFail: %s\n" |
4e85aff4 LP |
578 | "%sHandle: %s\n" |
579 | "%sFrom /etc/fstab: %s\n" | |
580 | "%sFrom /proc/swaps: %s\n" | |
581 | "%sFrom fragment: %s\n", | |
07b0b134 ML |
582 | prefix, swap_state_to_string(s->state), |
583 | prefix, s->what, | |
4e85aff4 LP |
584 | prefix, p->priority, |
585 | prefix, yes_no(p->noauto), | |
173a8d04 | 586 | prefix, yes_no(p->nofail), |
4e85aff4 LP |
587 | prefix, yes_no(p->handle), |
588 | prefix, yes_no(s->from_etc_fstab), | |
589 | prefix, yes_no(s->from_proc_swaps), | |
590 | prefix, yes_no(s->from_fragment)); | |
e04aad61 LP |
591 | |
592 | if (s->control_pid > 0) | |
593 | fprintf(f, | |
594 | "%sControl PID: %lu\n", | |
595 | prefix, (unsigned long) s->control_pid); | |
596 | ||
597 | exec_context_dump(&s->exec_context, f, prefix); | |
598 | } | |
599 | ||
600 | static int swap_spawn(Swap *s, ExecCommand *c, pid_t *_pid) { | |
601 | pid_t pid; | |
602 | int r; | |
603 | ||
604 | assert(s); | |
605 | assert(c); | |
606 | assert(_pid); | |
607 | ||
608 | if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0) | |
609 | goto fail; | |
610 | ||
611 | if ((r = exec_spawn(c, | |
612 | NULL, | |
613 | &s->exec_context, | |
614 | NULL, 0, | |
615 | s->meta.manager->environment, | |
616 | true, | |
617 | true, | |
618 | true, | |
619 | s->meta.manager->confirm_spawn, | |
620 | s->meta.cgroup_bondings, | |
ab1f0633 | 621 | s->meta.cgroup_attributes, |
e04aad61 LP |
622 | &pid)) < 0) |
623 | goto fail; | |
624 | ||
625 | if ((r = unit_watch_pid(UNIT(s), pid)) < 0) | |
626 | /* FIXME: we need to do something here */ | |
627 | goto fail; | |
628 | ||
629 | *_pid = pid; | |
630 | ||
631 | return 0; | |
632 | ||
633 | fail: | |
634 | unit_unwatch_timer(UNIT(s), &s->timer_watch); | |
635 | ||
636 | return r; | |
07b0b134 ML |
637 | } |
638 | ||
639 | static void swap_enter_dead(Swap *s, bool success) { | |
640 | assert(s); | |
641 | ||
e04aad61 LP |
642 | if (!success) |
643 | s->failure = true; | |
644 | ||
645 | swap_set_state(s, s->failure ? SWAP_FAILED : SWAP_DEAD); | |
07b0b134 ML |
646 | } |
647 | ||
e04aad61 LP |
648 | static void swap_enter_active(Swap *s, bool success) { |
649 | assert(s); | |
650 | ||
651 | if (!success) | |
652 | s->failure = true; | |
653 | ||
654 | swap_set_state(s, SWAP_ACTIVE); | |
655 | } | |
656 | ||
657 | static void swap_enter_signal(Swap *s, SwapState state, bool success) { | |
07b0b134 | 658 | int r; |
e04aad61 LP |
659 | Set *pid_set = NULL; |
660 | bool wait_for_exit = false; | |
07b0b134 ML |
661 | |
662 | assert(s); | |
e04aad61 LP |
663 | |
664 | if (!success) | |
665 | s->failure = true; | |
666 | ||
667 | if (s->exec_context.kill_mode != KILL_NONE) { | |
668 | int sig = (state == SWAP_ACTIVATING_SIGTERM || | |
669 | state == SWAP_DEACTIVATING_SIGTERM) ? s->exec_context.kill_signal : SIGKILL; | |
670 | ||
671 | if (s->control_pid > 0) { | |
cd25cce9 | 672 | if (kill_and_sigcont(s->control_pid, sig) < 0 && errno != ESRCH) |
e04aad61 LP |
673 | |
674 | log_warning("Failed to kill control process %li: %m", (long) s->control_pid); | |
675 | else | |
676 | wait_for_exit = true; | |
677 | } | |
678 | ||
679 | if (s->exec_context.kill_mode == KILL_CONTROL_GROUP) { | |
680 | ||
681 | if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func))) { | |
682 | r = -ENOMEM; | |
683 | goto fail; | |
684 | } | |
685 | ||
686 | /* Exclude the control pid from being killed via the cgroup */ | |
687 | if (s->control_pid > 0) | |
688 | if ((r = set_put(pid_set, LONG_TO_PTR(s->control_pid))) < 0) | |
689 | goto fail; | |
690 | ||
430c18ed | 691 | if ((r = cgroup_bonding_kill_list(s->meta.cgroup_bondings, sig, true, pid_set)) < 0) { |
e04aad61 LP |
692 | if (r != -EAGAIN && r != -ESRCH && r != -ENOENT) |
693 | log_warning("Failed to kill control group: %s", strerror(-r)); | |
694 | } else if (r > 0) | |
695 | wait_for_exit = true; | |
696 | ||
697 | set_free(pid_set); | |
da19d5c1 | 698 | pid_set = NULL; |
e04aad61 LP |
699 | } |
700 | } | |
701 | ||
702 | if (wait_for_exit) { | |
703 | if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0) | |
704 | goto fail; | |
705 | ||
706 | swap_set_state(s, state); | |
707 | } else | |
708 | swap_enter_dead(s, true); | |
709 | ||
710 | return; | |
711 | ||
712 | fail: | |
713 | log_warning("%s failed to kill processes: %s", s->meta.id, strerror(-r)); | |
714 | ||
715 | swap_enter_dead(s, false); | |
716 | ||
717 | if (pid_set) | |
718 | set_free(pid_set); | |
719 | } | |
720 | ||
721 | static void swap_enter_activating(Swap *s) { | |
722 | int r, priority; | |
723 | ||
724 | assert(s); | |
725 | ||
726 | s->control_command_id = SWAP_EXEC_ACTIVATE; | |
727 | s->control_command = s->exec_command + SWAP_EXEC_ACTIVATE; | |
07b0b134 | 728 | |
4e85aff4 LP |
729 | if (s->from_fragment) |
730 | priority = s->parameters_fragment.priority; | |
731 | else if (s->from_etc_fstab) | |
732 | priority = s->parameters_etc_fstab.priority; | |
e04aad61 LP |
733 | else |
734 | priority = -1; | |
4e85aff4 | 735 | |
e04aad61 LP |
736 | if (priority >= 0) { |
737 | char p[LINE_MAX]; | |
07b0b134 | 738 | |
e04aad61 LP |
739 | snprintf(p, sizeof(p), "%i", priority); |
740 | char_array_0(p); | |
07b0b134 | 741 | |
e04aad61 LP |
742 | r = exec_command_set( |
743 | s->control_command, | |
744 | "/sbin/swapon", | |
745 | "-p", | |
746 | p, | |
747 | s->what, | |
748 | NULL); | |
749 | } else | |
750 | r = exec_command_set( | |
751 | s->control_command, | |
752 | "/sbin/swapon", | |
753 | s->what, | |
754 | NULL); | |
755 | ||
756 | if (r < 0) | |
757 | goto fail; | |
758 | ||
759 | swap_unwatch_control_pid(s); | |
760 | ||
761 | if ((r = swap_spawn(s, s->control_command, &s->control_pid)) < 0) | |
762 | goto fail; | |
763 | ||
764 | swap_set_state(s, SWAP_ACTIVATING); | |
765 | ||
766 | return; | |
767 | ||
768 | fail: | |
769 | log_warning("%s failed to run 'swapon' task: %s", s->meta.id, strerror(-r)); | |
770 | swap_enter_dead(s, false); | |
771 | } | |
772 | ||
773 | static void swap_enter_deactivating(Swap *s, bool success) { | |
774 | int r; | |
775 | ||
776 | assert(s); | |
777 | ||
778 | if (!success) | |
779 | s->failure = true; | |
780 | ||
781 | s->control_command_id = SWAP_EXEC_DEACTIVATE; | |
782 | s->control_command = s->exec_command + SWAP_EXEC_DEACTIVATE; | |
783 | ||
784 | if ((r = exec_command_set( | |
785 | s->control_command, | |
786 | "/sbin/swapoff", | |
787 | s->what, | |
788 | NULL)) < 0) | |
789 | goto fail; | |
790 | ||
791 | swap_unwatch_control_pid(s); | |
792 | ||
793 | if ((r = swap_spawn(s, s->control_command, &s->control_pid)) < 0) | |
794 | goto fail; | |
795 | ||
796 | swap_set_state(s, SWAP_DEACTIVATING); | |
797 | ||
798 | return; | |
799 | ||
800 | fail: | |
801 | log_warning("%s failed to run 'swapoff' task: %s", s->meta.id, strerror(-r)); | |
802 | swap_enter_active(s, false); | |
803 | } | |
804 | ||
805 | static int swap_start(Unit *u) { | |
806 | Swap *s = SWAP(u); | |
807 | ||
808 | assert(s); | |
809 | ||
810 | /* We cannot fulfill this request right now, try again later | |
811 | * please! */ | |
812 | ||
813 | if (s->state == SWAP_DEACTIVATING || | |
814 | s->state == SWAP_DEACTIVATING_SIGTERM || | |
815 | s->state == SWAP_DEACTIVATING_SIGKILL || | |
816 | s->state == SWAP_ACTIVATING_SIGTERM || | |
817 | s->state == SWAP_ACTIVATING_SIGKILL) | |
818 | return -EAGAIN; | |
819 | ||
820 | if (s->state == SWAP_ACTIVATING) | |
821 | return 0; | |
822 | ||
823 | assert(s->state == SWAP_DEAD || s->state == SWAP_FAILED); | |
824 | ||
825 | s->failure = false; | |
826 | swap_enter_activating(s); | |
07b0b134 ML |
827 | return 0; |
828 | } | |
829 | ||
830 | static int swap_stop(Unit *u) { | |
831 | Swap *s = SWAP(u); | |
07b0b134 ML |
832 | |
833 | assert(s); | |
834 | ||
e04aad61 LP |
835 | if (s->state == SWAP_DEACTIVATING || |
836 | s->state == SWAP_DEACTIVATING_SIGTERM || | |
837 | s->state == SWAP_DEACTIVATING_SIGKILL || | |
838 | s->state == SWAP_ACTIVATING_SIGTERM || | |
839 | s->state == SWAP_ACTIVATING_SIGKILL) | |
840 | return 0; | |
07b0b134 | 841 | |
e04aad61 LP |
842 | assert(s->state == SWAP_ACTIVATING || |
843 | s->state == SWAP_ACTIVE); | |
07b0b134 | 844 | |
e04aad61 | 845 | swap_enter_deactivating(s, true); |
07b0b134 ML |
846 | return 0; |
847 | } | |
848 | ||
849 | static int swap_serialize(Unit *u, FILE *f, FDSet *fds) { | |
850 | Swap *s = SWAP(u); | |
851 | ||
852 | assert(s); | |
853 | assert(f); | |
854 | assert(fds); | |
855 | ||
856 | unit_serialize_item(u, f, "state", swap_state_to_string(s->state)); | |
e04aad61 LP |
857 | unit_serialize_item(u, f, "failure", yes_no(s->failure)); |
858 | ||
859 | if (s->control_pid > 0) | |
860 | unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) s->control_pid); | |
861 | ||
862 | if (s->control_command_id >= 0) | |
863 | unit_serialize_item(u, f, "control-command", swap_exec_command_to_string(s->control_command_id)); | |
07b0b134 ML |
864 | |
865 | return 0; | |
866 | } | |
867 | ||
868 | static int swap_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
869 | Swap *s = SWAP(u); | |
870 | ||
871 | assert(s); | |
872 | assert(fds); | |
873 | ||
874 | if (streq(key, "state")) { | |
875 | SwapState state; | |
876 | ||
877 | if ((state = swap_state_from_string(value)) < 0) | |
878 | log_debug("Failed to parse state value %s", value); | |
879 | else | |
880 | s->deserialized_state = state; | |
e04aad61 LP |
881 | } else if (streq(key, "failure")) { |
882 | int b; | |
883 | ||
884 | if ((b = parse_boolean(value)) < 0) | |
885 | log_debug("Failed to parse failure value %s", value); | |
886 | else | |
887 | s->failure = b || s->failure; | |
888 | ||
889 | } else if (streq(key, "control-pid")) { | |
890 | pid_t pid; | |
891 | ||
892 | if (parse_pid(value, &pid) < 0) | |
893 | log_debug("Failed to parse control-pid value %s", value); | |
894 | else | |
895 | s->control_pid = pid; | |
896 | ||
897 | } else if (streq(key, "control-command")) { | |
898 | SwapExecCommand id; | |
899 | ||
900 | if ((id = swap_exec_command_from_string(value)) < 0) | |
901 | log_debug("Failed to parse exec-command value %s", value); | |
902 | else { | |
903 | s->control_command_id = id; | |
904 | s->control_command = s->exec_command + id; | |
905 | } | |
906 | ||
07b0b134 ML |
907 | } else |
908 | log_debug("Unknown serialization key '%s'", key); | |
909 | ||
910 | return 0; | |
911 | } | |
912 | ||
913 | static UnitActiveState swap_active_state(Unit *u) { | |
914 | assert(u); | |
915 | ||
916 | return state_translation_table[SWAP(u)->state]; | |
917 | } | |
918 | ||
919 | static const char *swap_sub_state_to_string(Unit *u) { | |
920 | assert(u); | |
921 | ||
922 | return swap_state_to_string(SWAP(u)->state); | |
923 | } | |
924 | ||
925 | static bool swap_check_gc(Unit *u) { | |
926 | Swap *s = SWAP(u); | |
927 | ||
928 | assert(s); | |
929 | ||
4e85aff4 | 930 | return s->from_etc_fstab || s->from_proc_swaps; |
07b0b134 ML |
931 | } |
932 | ||
e04aad61 LP |
933 | static void swap_sigchld_event(Unit *u, pid_t pid, int code, int status) { |
934 | Swap *s = SWAP(u); | |
935 | bool success; | |
936 | ||
937 | assert(s); | |
938 | assert(pid >= 0); | |
939 | ||
940 | if (pid != s->control_pid) | |
941 | return; | |
942 | ||
943 | s->control_pid = 0; | |
944 | ||
945 | success = is_clean_exit(code, status); | |
946 | s->failure = s->failure || !success; | |
947 | ||
948 | if (s->control_command) { | |
6ea832a2 | 949 | exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status); |
e04aad61 LP |
950 | s->control_command = NULL; |
951 | s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; | |
952 | } | |
953 | ||
954 | log_full(success ? LOG_DEBUG : LOG_NOTICE, | |
955 | "%s swap process exited, code=%s status=%i", u->meta.id, sigchld_code_to_string(code), status); | |
956 | ||
957 | switch (s->state) { | |
958 | ||
959 | case SWAP_ACTIVATING: | |
960 | case SWAP_ACTIVATING_SIGTERM: | |
961 | case SWAP_ACTIVATING_SIGKILL: | |
962 | ||
963 | if (success) | |
964 | swap_enter_active(s, true); | |
965 | else | |
966 | swap_enter_dead(s, false); | |
967 | break; | |
968 | ||
969 | case SWAP_DEACTIVATING: | |
970 | case SWAP_DEACTIVATING_SIGKILL: | |
971 | case SWAP_DEACTIVATING_SIGTERM: | |
972 | ||
973 | if (success) | |
974 | swap_enter_dead(s, true); | |
975 | else | |
976 | swap_enter_dead(s, false); | |
977 | break; | |
978 | ||
979 | default: | |
980 | assert_not_reached("Uh, control process died at wrong time."); | |
981 | } | |
982 | ||
983 | /* Notify clients about changed exit status */ | |
984 | unit_add_to_dbus_queue(u); | |
985 | ||
986 | /* Request a reload of /proc/swaps, so that following units | |
987 | * can follow our state change */ | |
988 | u->meta.manager->request_reload = true; | |
989 | } | |
990 | ||
991 | static void swap_timer_event(Unit *u, uint64_t elapsed, Watch *w) { | |
992 | Swap *s = SWAP(u); | |
993 | ||
994 | assert(s); | |
995 | assert(elapsed == 1); | |
996 | assert(w == &s->timer_watch); | |
997 | ||
998 | switch (s->state) { | |
999 | ||
1000 | case SWAP_ACTIVATING: | |
1001 | log_warning("%s activation timed out. Stopping.", u->meta.id); | |
1002 | swap_enter_signal(s, SWAP_ACTIVATING_SIGTERM, false); | |
1003 | break; | |
1004 | ||
1005 | case SWAP_DEACTIVATING: | |
1006 | log_warning("%s deactivation timed out. Stopping.", u->meta.id); | |
1007 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGTERM, false); | |
1008 | break; | |
1009 | ||
1010 | case SWAP_ACTIVATING_SIGTERM: | |
ba035df2 LP |
1011 | if (s->exec_context.send_sigkill) { |
1012 | log_warning("%s activation timed out. Killing.", u->meta.id); | |
1013 | swap_enter_signal(s, SWAP_ACTIVATING_SIGKILL, false); | |
1014 | } else { | |
1015 | log_warning("%s activation timed out. Skipping SIGKILL. Ignoring.", u->meta.id); | |
1016 | swap_enter_dead(s, false); | |
1017 | } | |
e04aad61 LP |
1018 | break; |
1019 | ||
1020 | case SWAP_DEACTIVATING_SIGTERM: | |
ba035df2 LP |
1021 | if (s->exec_context.send_sigkill) { |
1022 | log_warning("%s deactivation timed out. Killing.", u->meta.id); | |
1023 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, false); | |
1024 | } else { | |
1025 | log_warning("%s deactivation timed out. Skipping SIGKILL. Ignoring.", u->meta.id); | |
1026 | swap_enter_dead(s, false); | |
1027 | } | |
e04aad61 LP |
1028 | break; |
1029 | ||
1030 | case SWAP_ACTIVATING_SIGKILL: | |
1031 | case SWAP_DEACTIVATING_SIGKILL: | |
1032 | log_warning("%s swap process still around after SIGKILL. Ignoring.", u->meta.id); | |
1033 | swap_enter_dead(s, false); | |
1034 | break; | |
1035 | ||
1036 | default: | |
1037 | assert_not_reached("Timeout at wrong time."); | |
1038 | } | |
1039 | } | |
1040 | ||
1041 | static int swap_load_proc_swaps(Manager *m, bool set_flags) { | |
1042 | unsigned i; | |
1043 | int r = 0; | |
1044 | ||
1045 | assert(m); | |
1046 | ||
07b0b134 | 1047 | rewind(m->proc_swaps); |
bab45044 | 1048 | |
4e85aff4 | 1049 | (void) fscanf(m->proc_swaps, "%*s %*s %*s %*s %*s\n"); |
07b0b134 | 1050 | |
e04aad61 | 1051 | for (i = 1;; i++) { |
07b0b134 ML |
1052 | char *dev = NULL, *d; |
1053 | int prio = 0, k; | |
1054 | ||
4e85aff4 | 1055 | if ((k = fscanf(m->proc_swaps, |
e04aad61 LP |
1056 | "%ms " /* device/file */ |
1057 | "%*s " /* type of swap */ | |
1058 | "%*s " /* swap size */ | |
1059 | "%*s " /* used */ | |
4e85aff4 LP |
1060 | "%i\n", /* priority */ |
1061 | &dev, &prio)) != 2) { | |
07b0b134 | 1062 | |
07b0b134 | 1063 | if (k == EOF) |
4e85aff4 | 1064 | break; |
07b0b134 | 1065 | |
e04aad61 | 1066 | log_warning("Failed to parse /proc/swaps:%u.", i); |
07b0b134 | 1067 | free(dev); |
e04aad61 | 1068 | continue; |
07b0b134 | 1069 | } |
07b0b134 | 1070 | |
4e85aff4 | 1071 | d = cunescape(dev); |
07b0b134 | 1072 | free(dev); |
4e85aff4 LP |
1073 | |
1074 | if (!d) | |
1075 | return -ENOMEM; | |
1076 | ||
e04aad61 | 1077 | k = swap_process_new_swap(m, d, prio, set_flags); |
07b0b134 ML |
1078 | free(d); |
1079 | ||
1080 | if (k < 0) | |
e04aad61 | 1081 | r = k; |
07b0b134 ML |
1082 | } |
1083 | ||
e04aad61 LP |
1084 | return r; |
1085 | } | |
1086 | ||
1087 | int swap_dispatch_reload(Manager *m) { | |
4e434314 | 1088 | /* This function should go as soon as the kernel properly notifies us */ |
e04aad61 LP |
1089 | |
1090 | if (_likely_(!m->request_reload)) | |
1091 | return 0; | |
1092 | ||
1093 | m->request_reload = false; | |
1094 | ||
4e434314 LP |
1095 | return swap_fd_event(m, EPOLLPRI); |
1096 | } | |
1097 | ||
1098 | int swap_fd_event(Manager *m, int events) { | |
1099 | Meta *meta; | |
1100 | int r; | |
1101 | ||
1102 | assert(m); | |
1103 | assert(events & EPOLLPRI); | |
1104 | ||
bd40a2d8 | 1105 | if ((r = swap_load_proc_swaps(m, true)) < 0) { |
e04aad61 LP |
1106 | log_error("Failed to reread /proc/swaps: %s", strerror(-r)); |
1107 | ||
1108 | /* Reset flags, just in case, for late calls */ | |
ab5c3e3f | 1109 | LIST_FOREACH(units_by_type, meta, m->units_by_type[UNIT_SWAP]) { |
e04aad61 LP |
1110 | Swap *swap = (Swap*) meta; |
1111 | ||
1112 | swap->is_active = swap->just_activated = false; | |
1113 | } | |
1114 | ||
1115 | return 0; | |
1116 | } | |
1117 | ||
1118 | manager_dispatch_load_queue(m); | |
1119 | ||
ab5c3e3f | 1120 | LIST_FOREACH(units_by_type, meta, m->units_by_type[UNIT_SWAP]) { |
e04aad61 LP |
1121 | Swap *swap = (Swap*) meta; |
1122 | ||
1123 | if (!swap->is_active) { | |
1124 | /* This has just been deactivated */ | |
1125 | ||
1126 | swap->from_proc_swaps = false; | |
1127 | swap_unset_proc_swaps(swap); | |
1128 | ||
1129 | switch (swap->state) { | |
1130 | ||
1131 | case SWAP_ACTIVE: | |
1132 | swap_enter_dead(swap, true); | |
1133 | break; | |
1134 | ||
1135 | default: | |
1136 | swap_set_state(swap, swap->state); | |
1137 | break; | |
1138 | } | |
1139 | ||
1140 | } else if (swap->just_activated) { | |
1141 | ||
1142 | /* New swap entry */ | |
1143 | ||
1144 | switch (swap->state) { | |
1145 | ||
1146 | case SWAP_DEAD: | |
1147 | case SWAP_FAILED: | |
1148 | swap_enter_active(swap, true); | |
1149 | break; | |
1150 | ||
1151 | default: | |
1152 | /* Nothing really changed, but let's | |
1153 | * issue an notification call | |
1154 | * nonetheless, in case somebody is | |
1155 | * waiting for this. */ | |
1156 | swap_set_state(swap, swap->state); | |
1157 | break; | |
1158 | } | |
1159 | } | |
1160 | ||
1161 | /* Reset the flags for later calls */ | |
1162 | swap->is_active = swap->just_activated = false; | |
1163 | } | |
1164 | ||
1165 | return 1; | |
1166 | } | |
1167 | ||
1168 | static Unit *swap_following(Unit *u) { | |
1169 | Swap *s = SWAP(u); | |
1170 | Swap *other, *first = NULL; | |
1171 | ||
1172 | assert(s); | |
1173 | ||
1174 | if (streq_ptr(s->what, s->parameters_proc_swaps.what)) | |
1175 | return NULL; | |
1176 | ||
1177 | /* Make everybody follow the unit that's named after the swap | |
1178 | * device in the kernel */ | |
1179 | ||
1180 | LIST_FOREACH_AFTER(same_proc_swaps, other, s) | |
1181 | if (streq_ptr(other->what, other->parameters_proc_swaps.what)) | |
1182 | return UNIT(other); | |
1183 | ||
1184 | LIST_FOREACH_BEFORE(same_proc_swaps, other, s) { | |
1185 | if (streq_ptr(other->what, other->parameters_proc_swaps.what)) | |
1186 | return UNIT(other); | |
1187 | ||
1188 | first = other; | |
1189 | } | |
1190 | ||
1191 | return UNIT(first); | |
07b0b134 ML |
1192 | } |
1193 | ||
6210e7fc LP |
1194 | static int swap_following_set(Unit *u, Set **_set) { |
1195 | Swap *s = SWAP(u); | |
1196 | Swap *other; | |
1197 | Set *set; | |
1198 | int r; | |
1199 | ||
1200 | assert(s); | |
1201 | assert(_set); | |
1202 | ||
1203 | if (LIST_JUST_US(same_proc_swaps, s)) { | |
1204 | *_set = NULL; | |
1205 | return 0; | |
1206 | } | |
1207 | ||
1208 | if (!(set = set_new(NULL, NULL))) | |
1209 | return -ENOMEM; | |
1210 | ||
1211 | LIST_FOREACH_AFTER(same_proc_swaps, other, s) | |
1212 | if ((r = set_put(set, other)) < 0) | |
1213 | goto fail; | |
1214 | ||
1215 | LIST_FOREACH_BEFORE(same_proc_swaps, other, s) | |
1216 | if ((r = set_put(set, other)) < 0) | |
1217 | goto fail; | |
1218 | ||
1219 | *_set = set; | |
1220 | return 1; | |
1221 | ||
1222 | fail: | |
1223 | set_free(set); | |
1224 | return r; | |
1225 | } | |
1226 | ||
07b0b134 ML |
1227 | static void swap_shutdown(Manager *m) { |
1228 | assert(m); | |
1229 | ||
1230 | if (m->proc_swaps) { | |
1231 | fclose(m->proc_swaps); | |
1232 | m->proc_swaps = NULL; | |
1233 | } | |
e04aad61 LP |
1234 | |
1235 | hashmap_free(m->swaps_by_proc_swaps); | |
1236 | m->swaps_by_proc_swaps = NULL; | |
07b0b134 ML |
1237 | } |
1238 | ||
07b0b134 ML |
1239 | static int swap_enumerate(Manager *m) { |
1240 | int r; | |
4e434314 | 1241 | struct epoll_event ev; |
07b0b134 ML |
1242 | assert(m); |
1243 | ||
4e434314 | 1244 | if (!m->proc_swaps) { |
4e85aff4 | 1245 | if (!(m->proc_swaps = fopen("/proc/swaps", "re"))) |
3f858732 | 1246 | return (errno == ENOENT) ? 0 : -errno; |
07b0b134 | 1247 | |
4e434314 LP |
1248 | m->swap_watch.type = WATCH_SWAP; |
1249 | m->swap_watch.fd = fileno(m->proc_swaps); | |
1250 | ||
1251 | zero(ev); | |
1252 | ev.events = EPOLLPRI; | |
1253 | ev.data.ptr = &m->swap_watch; | |
1254 | ||
1255 | if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->swap_watch.fd, &ev) < 0) | |
1256 | return -errno; | |
1257 | } | |
1258 | ||
e04aad61 LP |
1259 | /* We rely on mount.c to load /etc/fstab for us */ |
1260 | ||
1261 | if ((r = swap_load_proc_swaps(m, false)) < 0) | |
07b0b134 ML |
1262 | swap_shutdown(m); |
1263 | ||
1264 | return r; | |
1265 | } | |
1266 | ||
fdf20a31 | 1267 | static void swap_reset_failed(Unit *u) { |
5632e374 LP |
1268 | Swap *s = SWAP(u); |
1269 | ||
1270 | assert(s); | |
1271 | ||
fdf20a31 | 1272 | if (s->state == SWAP_FAILED) |
5632e374 | 1273 | swap_set_state(s, SWAP_DEAD); |
e04aad61 LP |
1274 | |
1275 | s->failure = false; | |
5632e374 LP |
1276 | } |
1277 | ||
8a0867d6 LP |
1278 | static int swap_kill(Unit *u, KillWho who, KillMode mode, int signo, DBusError *error) { |
1279 | Swap *s = SWAP(u); | |
1280 | int r = 0; | |
1281 | Set *pid_set = NULL; | |
1282 | ||
1283 | assert(s); | |
1284 | ||
1285 | if (who == KILL_MAIN) { | |
1286 | dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "Swap units have no main processes"); | |
a17204af | 1287 | return -ESRCH; |
8a0867d6 LP |
1288 | } |
1289 | ||
1290 | if (s->control_pid <= 0 && who == KILL_CONTROL) { | |
1291 | dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "No control process to kill"); | |
a17204af | 1292 | return -ESRCH; |
8a0867d6 LP |
1293 | } |
1294 | ||
3611581e LP |
1295 | if (who == KILL_CONTROL || who == KILL_ALL) |
1296 | if (s->control_pid > 0) | |
1297 | if (kill(s->control_pid, signo) < 0) | |
1298 | r = -errno; | |
8a0867d6 | 1299 | |
3611581e | 1300 | if (who == KILL_ALL && mode == KILL_CONTROL_GROUP) { |
8a0867d6 LP |
1301 | int q; |
1302 | ||
1303 | if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func))) | |
1304 | return -ENOMEM; | |
1305 | ||
1306 | /* Exclude the control pid from being killed via the cgroup */ | |
1307 | if (s->control_pid > 0) | |
1308 | if ((q = set_put(pid_set, LONG_TO_PTR(s->control_pid))) < 0) { | |
1309 | r = q; | |
1310 | goto finish; | |
1311 | } | |
1312 | ||
430c18ed | 1313 | if ((q = cgroup_bonding_kill_list(s->meta.cgroup_bondings, signo, false, pid_set)) < 0) |
3611581e | 1314 | if (q != -EAGAIN && q != -ESRCH && q != -ENOENT) |
8a0867d6 LP |
1315 | r = q; |
1316 | } | |
1317 | ||
1318 | finish: | |
1319 | if (pid_set) | |
1320 | set_free(pid_set); | |
1321 | ||
1322 | return r; | |
1323 | } | |
1324 | ||
5632e374 LP |
1325 | static const char* const swap_state_table[_SWAP_STATE_MAX] = { |
1326 | [SWAP_DEAD] = "dead", | |
e04aad61 | 1327 | [SWAP_ACTIVATING] = "activating", |
5632e374 | 1328 | [SWAP_ACTIVE] = "active", |
e04aad61 LP |
1329 | [SWAP_DEACTIVATING] = "deactivating", |
1330 | [SWAP_ACTIVATING_SIGTERM] = "activating-sigterm", | |
1331 | [SWAP_ACTIVATING_SIGKILL] = "activating-sigkill", | |
1332 | [SWAP_DEACTIVATING_SIGTERM] = "deactivating-sigterm", | |
1333 | [SWAP_DEACTIVATING_SIGKILL] = "deactivating-sigkill", | |
fdf20a31 | 1334 | [SWAP_FAILED] = "failed" |
5632e374 LP |
1335 | }; |
1336 | ||
1337 | DEFINE_STRING_TABLE_LOOKUP(swap_state, SwapState); | |
1338 | ||
e04aad61 LP |
1339 | static const char* const swap_exec_command_table[_SWAP_EXEC_COMMAND_MAX] = { |
1340 | [SWAP_EXEC_ACTIVATE] = "ExecActivate", | |
1341 | [SWAP_EXEC_DEACTIVATE] = "ExecDeactivate", | |
1342 | }; | |
1343 | ||
1344 | DEFINE_STRING_TABLE_LOOKUP(swap_exec_command, SwapExecCommand); | |
1345 | ||
07b0b134 ML |
1346 | const UnitVTable swap_vtable = { |
1347 | .suffix = ".swap", | |
7d17cfbc | 1348 | .object_size = sizeof(Swap), |
f975e971 LP |
1349 | .sections = |
1350 | "Unit\0" | |
1351 | "Swap\0" | |
1352 | "Install\0", | |
07b0b134 | 1353 | |
e04aad61 | 1354 | .no_alias = true, |
07b0b134 | 1355 | .no_instances = true, |
9e58ff9c | 1356 | .show_status = true, |
07b0b134 | 1357 | |
4e85aff4 | 1358 | .init = swap_init, |
07b0b134 | 1359 | .load = swap_load, |
6e620bec | 1360 | .done = swap_done, |
07b0b134 ML |
1361 | |
1362 | .coldplug = swap_coldplug, | |
1363 | ||
1364 | .dump = swap_dump, | |
1365 | ||
1366 | .start = swap_start, | |
1367 | .stop = swap_stop, | |
1368 | ||
8a0867d6 LP |
1369 | .kill = swap_kill, |
1370 | ||
07b0b134 ML |
1371 | .serialize = swap_serialize, |
1372 | .deserialize_item = swap_deserialize_item, | |
1373 | ||
1374 | .active_state = swap_active_state, | |
1375 | .sub_state_to_string = swap_sub_state_to_string, | |
1376 | ||
1377 | .check_gc = swap_check_gc, | |
1378 | ||
e04aad61 LP |
1379 | .sigchld_event = swap_sigchld_event, |
1380 | .timer_event = swap_timer_event, | |
1381 | ||
1382 | .reset_failed = swap_reset_failed, | |
1383 | ||
c4e2ceae | 1384 | .bus_interface = "org.freedesktop.systemd1.Swap", |
07b0b134 | 1385 | .bus_message_handler = bus_swap_message_handler, |
c4e2ceae | 1386 | .bus_invalidating_properties = bus_swap_invalidating_properties, |
07b0b134 | 1387 | |
e04aad61 | 1388 | .following = swap_following, |
6210e7fc | 1389 | .following_set = swap_following_set, |
5632e374 | 1390 | |
6e620bec LP |
1391 | .enumerate = swap_enumerate, |
1392 | .shutdown = swap_shutdown | |
07b0b134 | 1393 | }; |