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d6c9574f | 1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
07b0b134 ML |
2 | |
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2010 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
9 | under the terms of the GNU Lesser General Public License as published by |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
07b0b134 ML |
11 | (at your option) any later version. |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 16 | Lesser General Public License for more details. |
07b0b134 | 17 | |
5430f7f2 | 18 | You should have received a copy of the GNU Lesser General Public License |
07b0b134 ML |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
20 | ***/ | |
21 | ||
22 | #include <errno.h> | |
23 | #include <limits.h> | |
24 | #include <unistd.h> | |
25 | #include <fcntl.h> | |
26 | #include <sys/epoll.h> | |
27 | #include <sys/stat.h> | |
28 | #include <sys/swap.h> | |
e04aad61 | 29 | #include <libudev.h> |
07b0b134 ML |
30 | |
31 | #include "unit.h" | |
32 | #include "swap.h" | |
33 | #include "load-fragment.h" | |
34 | #include "load-dropin.h" | |
35 | #include "unit-name.h" | |
36 | #include "dbus-swap.h" | |
514f4ef5 | 37 | #include "special.h" |
8a0867d6 | 38 | #include "bus-errors.h" |
9a57c629 | 39 | #include "exit-status.h" |
f6a6225e | 40 | #include "def.h" |
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 | ||
1124fe6f | 65 | first = hashmap_get(UNIT(s)->manager->swaps_by_proc_swaps, s->parameters_proc_swaps.what); |
e04aad61 LP |
66 | LIST_REMOVE(Swap, same_proc_swaps, first, s); |
67 | ||
68 | if (first) | |
1124fe6f | 69 | hashmap_remove_and_replace(UNIT(s)->manager->swaps_by_proc_swaps, s->parameters_proc_swaps.what, first->parameters_proc_swaps.what, first); |
e04aad61 | 70 | else |
1124fe6f | 71 | hashmap_remove(UNIT(s)->manager->swaps_by_proc_swaps, s->parameters_proc_swaps.what); |
e04aad61 LP |
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); | |
1124fe6f | 81 | assert(UNIT(s)->load_state == UNIT_STUB); |
6e620bec | 82 | |
e04aad61 LP |
83 | s->timeout_usec = DEFAULT_TIMEOUT_USEC; |
84 | ||
85 | exec_context_init(&s->exec_context); | |
ac155bb8 MS |
86 | s->exec_context.std_output = u->manager->default_std_output; |
87 | s->exec_context.std_error = u->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 | ||
e1770af8 | 93 | s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; |
c8f4d764 | 94 | |
1124fe6f | 95 | UNIT(s)->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 | ||
1124fe6f MS |
137 | if (UNIT(s)->load_state != UNIT_LOADED || |
138 | UNIT(m)->load_state != UNIT_LOADED) | |
6e2ef85b LP |
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) { | |
ac155bb8 | 154 | Unit *other; |
6e2ef85b LP |
155 | int r; |
156 | ||
157 | assert(s); | |
158 | ||
1124fe6f | 159 | LIST_FOREACH(units_by_type, other, UNIT(s)->manager->units_by_type[UNIT_MOUNT]) |
595ed347 | 160 | if ((r = swap_add_one_mount_link(s, MOUNT(other))) < 0) |
6e2ef85b LP |
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 | ||
1124fe6f | 180 | if ((r = manager_load_unit(UNIT(s)->manager, SPECIAL_SWAP_TARGET, NULL, NULL, &tu)) < 0) |
07b0b134 ML |
181 | return r; |
182 | ||
81bf310e | 183 | if (!p->noauto && |
85385610 | 184 | !p->nofail && |
510051fc | 185 | s->from_etc_fstab && |
1124fe6f | 186 | UNIT(s)->manager->running_as == MANAGER_SYSTEM) |
6e2ef85b LP |
187 | if ((r = unit_add_dependency(tu, UNIT_WANTS, UNIT(s), true)) < 0) |
188 | return r; | |
07b0b134 ML |
189 | |
190 | return unit_add_dependency(UNIT(s), UNIT_BEFORE, tu, true); | |
191 | } | |
192 | ||
173a8d04 LP |
193 | static int swap_add_device_links(Swap *s) { |
194 | SwapParameters *p; | |
195 | ||
196 | assert(s); | |
197 | ||
198 | if (!s->what) | |
199 | return 0; | |
200 | ||
201 | if (s->from_fragment) | |
202 | p = &s->parameters_fragment; | |
203 | else if (s->from_etc_fstab) | |
204 | p = &s->parameters_etc_fstab; | |
205 | else | |
206 | return 0; | |
207 | ||
cfcfd4ae LP |
208 | if (is_device_path(s->what)) |
209 | return unit_add_node_link(UNIT(s), s->what, | |
210 | !p->noauto && p->nofail && | |
1124fe6f | 211 | UNIT(s)->manager->running_as == MANAGER_SYSTEM); |
cfcfd4ae LP |
212 | else |
213 | /* File based swap devices need to be ordered after | |
2b93b027 | 214 | * systemd-remount-fs.service, since they might need a |
cfcfd4ae | 215 | * writable file system. */ |
2b93b027 | 216 | return unit_add_dependency_by_name(UNIT(s), UNIT_AFTER, SPECIAL_REMOUNT_FS_SERVICE, NULL, true); |
173a8d04 LP |
217 | } |
218 | ||
2edd4434 LP |
219 | static int swap_add_default_dependencies(Swap *s) { |
220 | int r; | |
221 | ||
222 | assert(s); | |
223 | ||
1124fe6f | 224 | if (UNIT(s)->manager->running_as == MANAGER_SYSTEM) { |
2edd4434 | 225 | |
ead8e478 | 226 | if ((r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true)) < 0) |
e04aad61 | 227 | return r; |
2edd4434 LP |
228 | } |
229 | ||
230 | return 0; | |
231 | } | |
232 | ||
4e85aff4 LP |
233 | static int swap_verify(Swap *s) { |
234 | bool b; | |
235 | char *e; | |
236 | ||
1124fe6f | 237 | if (UNIT(s)->load_state != UNIT_LOADED) |
4e85aff4 LP |
238 | return 0; |
239 | ||
240 | if (!(e = unit_name_from_path(s->what, ".swap"))) | |
241 | return -ENOMEM; | |
242 | ||
243 | b = unit_has_name(UNIT(s), e); | |
244 | free(e); | |
245 | ||
246 | if (!b) { | |
1124fe6f | 247 | log_error("%s: Value of \"What\" and unit name do not match, not loading.\n", UNIT(s)->id); |
4e85aff4 LP |
248 | return -EINVAL; |
249 | } | |
250 | ||
e04aad61 | 251 | if (s->exec_context.pam_name && s->exec_context.kill_mode != KILL_CONTROL_GROUP) { |
1124fe6f | 252 | log_error("%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing.", UNIT(s)->id); |
e04aad61 LP |
253 | return -EINVAL; |
254 | } | |
255 | ||
4e85aff4 LP |
256 | return 0; |
257 | } | |
258 | ||
07b0b134 ML |
259 | static int swap_load(Unit *u) { |
260 | int r; | |
261 | Swap *s = SWAP(u); | |
262 | ||
263 | assert(s); | |
ac155bb8 | 264 | assert(u->load_state == UNIT_STUB); |
07b0b134 ML |
265 | |
266 | /* Load a .swap file */ | |
267 | if ((r = unit_load_fragment_and_dropin_optional(u)) < 0) | |
268 | return r; | |
269 | ||
ac155bb8 | 270 | if (u->load_state == UNIT_LOADED) { |
27abbe82 LP |
271 | if ((r = unit_add_exec_dependencies(u, &s->exec_context)) < 0) |
272 | return r; | |
4e85aff4 | 273 | |
1124fe6f | 274 | if (UNIT(s)->fragment_path) |
4e85aff4 LP |
275 | s->from_fragment = true; |
276 | ||
277 | if (!s->what) { | |
278 | if (s->parameters_fragment.what) | |
279 | s->what = strdup(s->parameters_fragment.what); | |
280 | else if (s->parameters_etc_fstab.what) | |
281 | s->what = strdup(s->parameters_etc_fstab.what); | |
282 | else if (s->parameters_proc_swaps.what) | |
283 | s->what = strdup(s->parameters_proc_swaps.what); | |
284 | else | |
ac155bb8 | 285 | s->what = unit_name_to_path(u->id); |
4e85aff4 LP |
286 | |
287 | if (!s->what) | |
07b0b134 | 288 | return -ENOMEM; |
4e85aff4 | 289 | } |
07b0b134 ML |
290 | |
291 | path_kill_slashes(s->what); | |
292 | ||
1124fe6f | 293 | if (!UNIT(s)->description) |
4e85aff4 LP |
294 | if ((r = unit_set_description(u, s->what)) < 0) |
295 | return r; | |
296 | ||
173a8d04 | 297 | if ((r = swap_add_device_links(s)) < 0) |
07b0b134 ML |
298 | return r; |
299 | ||
6e2ef85b LP |
300 | if ((r = swap_add_mount_links(s)) < 0) |
301 | return r; | |
07b0b134 ML |
302 | |
303 | if ((r = swap_add_target_links(s)) < 0) | |
304 | return r; | |
2edd4434 | 305 | |
d686d8a9 | 306 | if ((r = unit_add_default_cgroups(u)) < 0) |
f1a1cd64 LP |
307 | return r; |
308 | ||
1124fe6f | 309 | if (UNIT(s)->default_dependencies) |
2edd4434 LP |
310 | if ((r = swap_add_default_dependencies(s)) < 0) |
311 | return r; | |
07b0b134 ML |
312 | } |
313 | ||
314 | return swap_verify(s); | |
315 | } | |
316 | ||
4e85aff4 LP |
317 | int swap_add_one( |
318 | Manager *m, | |
319 | const char *what, | |
e04aad61 | 320 | const char *what_proc_swaps, |
4e85aff4 LP |
321 | int priority, |
322 | bool noauto, | |
173a8d04 | 323 | bool nofail, |
e04aad61 LP |
324 | bool set_flags) { |
325 | ||
4e85aff4 | 326 | Unit *u = NULL; |
e04aad61 | 327 | char *e = NULL, *wp = NULL; |
2c7c6144 | 328 | bool delete = false; |
07b0b134 | 329 | int r; |
4e85aff4 LP |
330 | SwapParameters *p; |
331 | ||
332 | assert(m); | |
333 | assert(what); | |
07b0b134 | 334 | |
7d17cfbc MS |
335 | e = unit_name_from_path(what, ".swap"); |
336 | if (!e) | |
07b0b134 ML |
337 | return -ENOMEM; |
338 | ||
e04aad61 LP |
339 | u = manager_get_unit(m, e); |
340 | ||
341 | if (what_proc_swaps && | |
342 | u && | |
343 | SWAP(u)->from_proc_swaps && | |
344 | !path_equal(SWAP(u)->parameters_proc_swaps.what, what_proc_swaps)) | |
345 | return -EEXIST; | |
4e85aff4 LP |
346 | |
347 | if (!u) { | |
07b0b134 ML |
348 | delete = true; |
349 | ||
7d17cfbc MS |
350 | u = unit_new(m, sizeof(Swap)); |
351 | if (!u) { | |
07b0b134 ML |
352 | free(e); |
353 | return -ENOMEM; | |
354 | } | |
e04aad61 | 355 | |
7d17cfbc MS |
356 | r = unit_add_name(u, e); |
357 | if (r < 0) | |
e04aad61 LP |
358 | goto fail; |
359 | ||
7d17cfbc MS |
360 | SWAP(u)->what = strdup(what); |
361 | if (!SWAP(u)->what) { | |
e04aad61 LP |
362 | r = -ENOMEM; |
363 | goto fail; | |
364 | } | |
365 | ||
366 | unit_add_to_load_queue(u); | |
4e85aff4 LP |
367 | } else |
368 | delete = false; | |
07b0b134 | 369 | |
e04aad61 LP |
370 | if (what_proc_swaps) { |
371 | Swap *first; | |
07b0b134 | 372 | |
4e85aff4 | 373 | p = &SWAP(u)->parameters_proc_swaps; |
e04aad61 LP |
374 | |
375 | if (!p->what) { | |
376 | if (!(wp = strdup(what_proc_swaps))) { | |
377 | r = -ENOMEM; | |
378 | goto fail; | |
379 | } | |
380 | ||
381 | if (!m->swaps_by_proc_swaps) | |
382 | if (!(m->swaps_by_proc_swaps = hashmap_new(string_hash_func, string_compare_func))) { | |
383 | r = -ENOMEM; | |
384 | goto fail; | |
385 | } | |
386 | ||
387 | free(p->what); | |
388 | p->what = wp; | |
389 | ||
390 | first = hashmap_get(m->swaps_by_proc_swaps, wp); | |
391 | LIST_PREPEND(Swap, same_proc_swaps, first, SWAP(u)); | |
392 | ||
393 | if ((r = hashmap_replace(m->swaps_by_proc_swaps, wp, first)) < 0) | |
394 | goto fail; | |
395 | } | |
396 | ||
397 | if (set_flags) { | |
398 | SWAP(u)->is_active = true; | |
399 | SWAP(u)->just_activated = !SWAP(u)->from_proc_swaps; | |
400 | } | |
401 | ||
4e85aff4 | 402 | SWAP(u)->from_proc_swaps = true; |
e04aad61 | 403 | |
4e85aff4 LP |
404 | } else { |
405 | p = &SWAP(u)->parameters_etc_fstab; | |
e04aad61 LP |
406 | |
407 | if (!(wp = strdup(what))) { | |
408 | r = -ENOMEM; | |
409 | goto fail; | |
410 | } | |
411 | ||
412 | free(p->what); | |
413 | p->what = wp; | |
414 | ||
4e85aff4 LP |
415 | SWAP(u)->from_etc_fstab = true; |
416 | } | |
07b0b134 | 417 | |
4e85aff4 LP |
418 | p->priority = priority; |
419 | p->noauto = noauto; | |
173a8d04 | 420 | p->nofail = nofail; |
07b0b134 | 421 | |
4e85aff4 | 422 | unit_add_to_dbus_queue(u); |
07b0b134 | 423 | |
4e85aff4 | 424 | free(e); |
07b0b134 ML |
425 | |
426 | return 0; | |
427 | ||
428 | fail: | |
e04aad61 LP |
429 | log_warning("Failed to load swap unit: %s", strerror(-r)); |
430 | ||
431 | free(wp); | |
4e85aff4 LP |
432 | free(e); |
433 | ||
434 | if (delete && u) | |
07b0b134 ML |
435 | unit_free(u); |
436 | ||
4e85aff4 | 437 | return r; |
07b0b134 ML |
438 | } |
439 | ||
e04aad61 LP |
440 | static int swap_process_new_swap(Manager *m, const char *device, int prio, bool set_flags) { |
441 | struct stat st; | |
442 | int r = 0, k; | |
443 | ||
444 | assert(m); | |
445 | ||
446 | if (stat(device, &st) >= 0 && S_ISBLK(st.st_mode)) { | |
447 | struct udev_device *d; | |
448 | const char *dn; | |
449 | struct udev_list_entry *item = NULL, *first = NULL; | |
450 | ||
451 | /* So this is a proper swap device. Create swap units | |
452 | * for all names this swap device is known under */ | |
453 | ||
454 | if (!(d = udev_device_new_from_devnum(m->udev, 'b', st.st_rdev))) | |
455 | return -ENOMEM; | |
456 | ||
8d8e9456 LP |
457 | dn = udev_device_get_devnode(d); |
458 | if (dn) | |
459 | r = swap_add_one(m, dn, device, prio, false, false, set_flags); | |
e04aad61 LP |
460 | |
461 | /* Add additional units for all symlinks */ | |
462 | first = udev_device_get_devlinks_list_entry(d); | |
463 | udev_list_entry_foreach(item, first) { | |
464 | const char *p; | |
465 | ||
466 | /* Don't bother with the /dev/block links */ | |
467 | p = udev_list_entry_get_name(item); | |
468 | ||
469 | if (path_startswith(p, "/dev/block/")) | |
470 | continue; | |
471 | ||
472 | if (stat(p, &st) >= 0) | |
473 | if ((!S_ISBLK(st.st_mode)) || st.st_rdev != udev_device_get_devnum(d)) | |
474 | continue; | |
475 | ||
8d8e9456 LP |
476 | k = swap_add_one(m, p, device, prio, false, false, set_flags); |
477 | if (k < 0) | |
e04aad61 LP |
478 | r = k; |
479 | } | |
480 | ||
481 | udev_device_unref(d); | |
482 | } | |
483 | ||
8d8e9456 LP |
484 | k = swap_add_one(m, device, device, prio, false, false, set_flags); |
485 | if (k < 0) | |
e04aad61 LP |
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", | |
1124fe6f | 513 | UNIT(s)->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" |
e1770af8 | 574 | "%sResult: %s\n" |
07b0b134 ML |
575 | "%sWhat: %s\n" |
576 | "%sPriority: %i\n" | |
4e85aff4 | 577 | "%sNoAuto: %s\n" |
173a8d04 | 578 | "%sNoFail: %s\n" |
4e85aff4 LP |
579 | "%sFrom /etc/fstab: %s\n" |
580 | "%sFrom /proc/swaps: %s\n" | |
581 | "%sFrom fragment: %s\n", | |
07b0b134 | 582 | prefix, swap_state_to_string(s->state), |
e1770af8 | 583 | prefix, swap_result_to_string(s->result), |
07b0b134 | 584 | prefix, s->what, |
4e85aff4 LP |
585 | prefix, p->priority, |
586 | prefix, yes_no(p->noauto), | |
173a8d04 | 587 | prefix, yes_no(p->nofail), |
4e85aff4 LP |
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, | |
1124fe6f | 615 | UNIT(s)->manager->environment, |
e04aad61 LP |
616 | true, |
617 | true, | |
618 | true, | |
1124fe6f MS |
619 | UNIT(s)->manager->confirm_spawn, |
620 | UNIT(s)->cgroup_bondings, | |
621 | UNIT(s)->cgroup_attributes, | |
ecedd90f | 622 | NULL, |
f2b68789 | 623 | NULL, |
e04aad61 LP |
624 | &pid)) < 0) |
625 | goto fail; | |
626 | ||
627 | if ((r = unit_watch_pid(UNIT(s), pid)) < 0) | |
628 | /* FIXME: we need to do something here */ | |
629 | goto fail; | |
630 | ||
631 | *_pid = pid; | |
632 | ||
633 | return 0; | |
634 | ||
635 | fail: | |
636 | unit_unwatch_timer(UNIT(s), &s->timer_watch); | |
637 | ||
638 | return r; | |
07b0b134 ML |
639 | } |
640 | ||
e1770af8 | 641 | static void swap_enter_dead(Swap *s, SwapResult f) { |
07b0b134 ML |
642 | assert(s); |
643 | ||
e1770af8 LP |
644 | if (f != SWAP_SUCCESS) |
645 | s->result = f; | |
e04aad61 | 646 | |
e1770af8 | 647 | swap_set_state(s, s->result != SWAP_SUCCESS ? SWAP_FAILED : SWAP_DEAD); |
07b0b134 ML |
648 | } |
649 | ||
e1770af8 | 650 | static void swap_enter_active(Swap *s, SwapResult f) { |
e04aad61 LP |
651 | assert(s); |
652 | ||
e1770af8 LP |
653 | if (f != SWAP_SUCCESS) |
654 | s->result = f; | |
e04aad61 LP |
655 | |
656 | swap_set_state(s, SWAP_ACTIVE); | |
657 | } | |
658 | ||
e1770af8 | 659 | static void swap_enter_signal(Swap *s, SwapState state, SwapResult f) { |
07b0b134 | 660 | int r; |
e04aad61 LP |
661 | Set *pid_set = NULL; |
662 | bool wait_for_exit = false; | |
07b0b134 ML |
663 | |
664 | assert(s); | |
e04aad61 | 665 | |
e1770af8 LP |
666 | if (f != SWAP_SUCCESS) |
667 | s->result = f; | |
e04aad61 LP |
668 | |
669 | if (s->exec_context.kill_mode != KILL_NONE) { | |
670 | int sig = (state == SWAP_ACTIVATING_SIGTERM || | |
671 | state == SWAP_DEACTIVATING_SIGTERM) ? s->exec_context.kill_signal : SIGKILL; | |
672 | ||
673 | if (s->control_pid > 0) { | |
cd25cce9 | 674 | if (kill_and_sigcont(s->control_pid, sig) < 0 && errno != ESRCH) |
e04aad61 LP |
675 | |
676 | log_warning("Failed to kill control process %li: %m", (long) s->control_pid); | |
677 | else | |
678 | wait_for_exit = true; | |
679 | } | |
680 | ||
681 | if (s->exec_context.kill_mode == KILL_CONTROL_GROUP) { | |
682 | ||
683 | if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func))) { | |
684 | r = -ENOMEM; | |
685 | goto fail; | |
686 | } | |
687 | ||
688 | /* Exclude the control pid from being killed via the cgroup */ | |
689 | if (s->control_pid > 0) | |
690 | if ((r = set_put(pid_set, LONG_TO_PTR(s->control_pid))) < 0) | |
691 | goto fail; | |
692 | ||
ecedd90f LP |
693 | r = cgroup_bonding_kill_list(UNIT(s)->cgroup_bondings, sig, true, pid_set, NULL); |
694 | if (r < 0) { | |
e04aad61 LP |
695 | if (r != -EAGAIN && r != -ESRCH && r != -ENOENT) |
696 | log_warning("Failed to kill control group: %s", strerror(-r)); | |
697 | } else if (r > 0) | |
698 | wait_for_exit = true; | |
699 | ||
700 | set_free(pid_set); | |
da19d5c1 | 701 | pid_set = NULL; |
e04aad61 LP |
702 | } |
703 | } | |
704 | ||
705 | if (wait_for_exit) { | |
706 | if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0) | |
707 | goto fail; | |
708 | ||
709 | swap_set_state(s, state); | |
710 | } else | |
e1770af8 | 711 | swap_enter_dead(s, SWAP_SUCCESS); |
e04aad61 LP |
712 | |
713 | return; | |
714 | ||
715 | fail: | |
1124fe6f | 716 | log_warning("%s failed to kill processes: %s", UNIT(s)->id, strerror(-r)); |
e04aad61 | 717 | |
e1770af8 | 718 | swap_enter_dead(s, SWAP_FAILURE_RESOURCES); |
e04aad61 LP |
719 | |
720 | if (pid_set) | |
721 | set_free(pid_set); | |
722 | } | |
723 | ||
724 | static void swap_enter_activating(Swap *s) { | |
725 | int r, priority; | |
726 | ||
727 | assert(s); | |
728 | ||
729 | s->control_command_id = SWAP_EXEC_ACTIVATE; | |
730 | s->control_command = s->exec_command + SWAP_EXEC_ACTIVATE; | |
07b0b134 | 731 | |
4e85aff4 LP |
732 | if (s->from_fragment) |
733 | priority = s->parameters_fragment.priority; | |
734 | else if (s->from_etc_fstab) | |
735 | priority = s->parameters_etc_fstab.priority; | |
e04aad61 LP |
736 | else |
737 | priority = -1; | |
4e85aff4 | 738 | |
e04aad61 LP |
739 | if (priority >= 0) { |
740 | char p[LINE_MAX]; | |
07b0b134 | 741 | |
e04aad61 LP |
742 | snprintf(p, sizeof(p), "%i", priority); |
743 | char_array_0(p); | |
07b0b134 | 744 | |
e04aad61 LP |
745 | r = exec_command_set( |
746 | s->control_command, | |
747 | "/sbin/swapon", | |
748 | "-p", | |
749 | p, | |
750 | s->what, | |
751 | NULL); | |
752 | } else | |
753 | r = exec_command_set( | |
754 | s->control_command, | |
755 | "/sbin/swapon", | |
756 | s->what, | |
757 | NULL); | |
758 | ||
759 | if (r < 0) | |
760 | goto fail; | |
761 | ||
762 | swap_unwatch_control_pid(s); | |
763 | ||
764 | if ((r = swap_spawn(s, s->control_command, &s->control_pid)) < 0) | |
765 | goto fail; | |
766 | ||
767 | swap_set_state(s, SWAP_ACTIVATING); | |
768 | ||
769 | return; | |
770 | ||
771 | fail: | |
1124fe6f | 772 | log_warning("%s failed to run 'swapon' task: %s", UNIT(s)->id, strerror(-r)); |
e1770af8 | 773 | swap_enter_dead(s, SWAP_FAILURE_RESOURCES); |
e04aad61 LP |
774 | } |
775 | ||
e1770af8 | 776 | static void swap_enter_deactivating(Swap *s) { |
e04aad61 LP |
777 | int r; |
778 | ||
779 | assert(s); | |
780 | ||
e04aad61 LP |
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: | |
1124fe6f | 801 | log_warning("%s failed to run 'swapoff' task: %s", UNIT(s)->id, strerror(-r)); |
e1770af8 | 802 | swap_enter_active(s, SWAP_FAILURE_RESOURCES); |
e04aad61 LP |
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 | ||
e1770af8 | 825 | s->result = SWAP_SUCCESS; |
e04aad61 | 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 | |
e1770af8 | 845 | swap_enter_deactivating(s); |
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)); | |
e1770af8 | 857 | unit_serialize_item(u, f, "result", swap_result_to_string(s->result)); |
e04aad61 LP |
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; | |
e1770af8 LP |
881 | } else if (streq(key, "result")) { |
882 | SwapResult f; | |
883 | ||
884 | f = swap_result_from_string(value); | |
885 | if (f < 0) | |
886 | log_debug("Failed to parse result value %s", value); | |
887 | else if (f != SWAP_SUCCESS) | |
888 | s->result = f; | |
e04aad61 LP |
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); | |
e1770af8 | 935 | SwapResult f; |
e04aad61 LP |
936 | |
937 | assert(s); | |
938 | assert(pid >= 0); | |
939 | ||
940 | if (pid != s->control_pid) | |
941 | return; | |
942 | ||
943 | s->control_pid = 0; | |
944 | ||
e1770af8 LP |
945 | if (is_clean_exit(code, status)) |
946 | f = SWAP_SUCCESS; | |
947 | else if (code == CLD_EXITED) | |
948 | f = SWAP_FAILURE_EXIT_CODE; | |
949 | else if (code == CLD_KILLED) | |
950 | f = SWAP_FAILURE_SIGNAL; | |
951 | else if (code == CLD_DUMPED) | |
952 | f = SWAP_FAILURE_CORE_DUMP; | |
953 | else | |
954 | assert_not_reached("Unknown code"); | |
955 | ||
956 | if (f != SWAP_SUCCESS) | |
957 | s->result = f; | |
e04aad61 LP |
958 | |
959 | if (s->control_command) { | |
6ea832a2 | 960 | exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status); |
e1770af8 | 961 | |
e04aad61 LP |
962 | s->control_command = NULL; |
963 | s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; | |
964 | } | |
965 | ||
e1770af8 | 966 | log_full(f == SWAP_SUCCESS ? LOG_DEBUG : LOG_NOTICE, |
ac155bb8 | 967 | "%s swap process exited, code=%s status=%i", u->id, sigchld_code_to_string(code), status); |
e04aad61 LP |
968 | |
969 | switch (s->state) { | |
970 | ||
971 | case SWAP_ACTIVATING: | |
972 | case SWAP_ACTIVATING_SIGTERM: | |
973 | case SWAP_ACTIVATING_SIGKILL: | |
974 | ||
e1770af8 LP |
975 | if (f == SWAP_SUCCESS) |
976 | swap_enter_active(s, f); | |
e04aad61 | 977 | else |
e1770af8 | 978 | swap_enter_dead(s, f); |
e04aad61 LP |
979 | break; |
980 | ||
981 | case SWAP_DEACTIVATING: | |
982 | case SWAP_DEACTIVATING_SIGKILL: | |
983 | case SWAP_DEACTIVATING_SIGTERM: | |
984 | ||
e1770af8 LP |
985 | if (f == SWAP_SUCCESS) |
986 | swap_enter_dead(s, f); | |
e04aad61 | 987 | else |
e1770af8 | 988 | swap_enter_dead(s, f); |
e04aad61 LP |
989 | break; |
990 | ||
991 | default: | |
992 | assert_not_reached("Uh, control process died at wrong time."); | |
993 | } | |
994 | ||
995 | /* Notify clients about changed exit status */ | |
996 | unit_add_to_dbus_queue(u); | |
997 | ||
998 | /* Request a reload of /proc/swaps, so that following units | |
999 | * can follow our state change */ | |
ac155bb8 | 1000 | u->manager->request_reload = true; |
e04aad61 LP |
1001 | } |
1002 | ||
1003 | static void swap_timer_event(Unit *u, uint64_t elapsed, Watch *w) { | |
1004 | Swap *s = SWAP(u); | |
1005 | ||
1006 | assert(s); | |
1007 | assert(elapsed == 1); | |
1008 | assert(w == &s->timer_watch); | |
1009 | ||
1010 | switch (s->state) { | |
1011 | ||
1012 | case SWAP_ACTIVATING: | |
ac155bb8 | 1013 | log_warning("%s activation timed out. Stopping.", u->id); |
e1770af8 | 1014 | swap_enter_signal(s, SWAP_ACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT); |
e04aad61 LP |
1015 | break; |
1016 | ||
1017 | case SWAP_DEACTIVATING: | |
ac155bb8 | 1018 | log_warning("%s deactivation timed out. Stopping.", u->id); |
e1770af8 | 1019 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT); |
e04aad61 LP |
1020 | break; |
1021 | ||
1022 | case SWAP_ACTIVATING_SIGTERM: | |
ba035df2 | 1023 | if (s->exec_context.send_sigkill) { |
ac155bb8 | 1024 | log_warning("%s activation timed out. Killing.", u->id); |
e1770af8 | 1025 | swap_enter_signal(s, SWAP_ACTIVATING_SIGKILL, SWAP_FAILURE_TIMEOUT); |
ba035df2 | 1026 | } else { |
ac155bb8 | 1027 | log_warning("%s activation timed out. Skipping SIGKILL. Ignoring.", u->id); |
e1770af8 | 1028 | swap_enter_dead(s, SWAP_FAILURE_TIMEOUT); |
ba035df2 | 1029 | } |
e04aad61 LP |
1030 | break; |
1031 | ||
1032 | case SWAP_DEACTIVATING_SIGTERM: | |
ba035df2 | 1033 | if (s->exec_context.send_sigkill) { |
ac155bb8 | 1034 | log_warning("%s deactivation timed out. Killing.", u->id); |
e1770af8 | 1035 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, SWAP_FAILURE_TIMEOUT); |
ba035df2 | 1036 | } else { |
ac155bb8 | 1037 | log_warning("%s deactivation timed out. Skipping SIGKILL. Ignoring.", u->id); |
e1770af8 | 1038 | swap_enter_dead(s, SWAP_FAILURE_TIMEOUT); |
ba035df2 | 1039 | } |
e04aad61 LP |
1040 | break; |
1041 | ||
1042 | case SWAP_ACTIVATING_SIGKILL: | |
1043 | case SWAP_DEACTIVATING_SIGKILL: | |
ac155bb8 | 1044 | log_warning("%s swap process still around after SIGKILL. Ignoring.", u->id); |
e1770af8 | 1045 | swap_enter_dead(s, SWAP_FAILURE_TIMEOUT); |
e04aad61 LP |
1046 | break; |
1047 | ||
1048 | default: | |
1049 | assert_not_reached("Timeout at wrong time."); | |
1050 | } | |
1051 | } | |
1052 | ||
1053 | static int swap_load_proc_swaps(Manager *m, bool set_flags) { | |
1054 | unsigned i; | |
1055 | int r = 0; | |
1056 | ||
1057 | assert(m); | |
1058 | ||
07b0b134 | 1059 | rewind(m->proc_swaps); |
bab45044 | 1060 | |
4e85aff4 | 1061 | (void) fscanf(m->proc_swaps, "%*s %*s %*s %*s %*s\n"); |
07b0b134 | 1062 | |
e04aad61 | 1063 | for (i = 1;; i++) { |
07b0b134 ML |
1064 | char *dev = NULL, *d; |
1065 | int prio = 0, k; | |
1066 | ||
4e85aff4 | 1067 | if ((k = fscanf(m->proc_swaps, |
e04aad61 LP |
1068 | "%ms " /* device/file */ |
1069 | "%*s " /* type of swap */ | |
1070 | "%*s " /* swap size */ | |
1071 | "%*s " /* used */ | |
4e85aff4 LP |
1072 | "%i\n", /* priority */ |
1073 | &dev, &prio)) != 2) { | |
07b0b134 | 1074 | |
07b0b134 | 1075 | if (k == EOF) |
4e85aff4 | 1076 | break; |
07b0b134 | 1077 | |
e04aad61 | 1078 | log_warning("Failed to parse /proc/swaps:%u.", i); |
07b0b134 | 1079 | free(dev); |
e04aad61 | 1080 | continue; |
07b0b134 | 1081 | } |
07b0b134 | 1082 | |
4e85aff4 | 1083 | d = cunescape(dev); |
07b0b134 | 1084 | free(dev); |
4e85aff4 LP |
1085 | |
1086 | if (!d) | |
1087 | return -ENOMEM; | |
1088 | ||
e04aad61 | 1089 | k = swap_process_new_swap(m, d, prio, set_flags); |
07b0b134 ML |
1090 | free(d); |
1091 | ||
1092 | if (k < 0) | |
e04aad61 | 1093 | r = k; |
07b0b134 ML |
1094 | } |
1095 | ||
e04aad61 LP |
1096 | return r; |
1097 | } | |
1098 | ||
1099 | int swap_dispatch_reload(Manager *m) { | |
4e434314 | 1100 | /* This function should go as soon as the kernel properly notifies us */ |
e04aad61 LP |
1101 | |
1102 | if (_likely_(!m->request_reload)) | |
1103 | return 0; | |
1104 | ||
1105 | m->request_reload = false; | |
1106 | ||
4e434314 LP |
1107 | return swap_fd_event(m, EPOLLPRI); |
1108 | } | |
1109 | ||
1110 | int swap_fd_event(Manager *m, int events) { | |
595ed347 | 1111 | Unit *u; |
4e434314 LP |
1112 | int r; |
1113 | ||
1114 | assert(m); | |
1115 | assert(events & EPOLLPRI); | |
1116 | ||
bd40a2d8 | 1117 | if ((r = swap_load_proc_swaps(m, true)) < 0) { |
e04aad61 LP |
1118 | log_error("Failed to reread /proc/swaps: %s", strerror(-r)); |
1119 | ||
1120 | /* Reset flags, just in case, for late calls */ | |
595ed347 MS |
1121 | LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) { |
1122 | Swap *swap = SWAP(u); | |
e04aad61 LP |
1123 | |
1124 | swap->is_active = swap->just_activated = false; | |
1125 | } | |
1126 | ||
1127 | return 0; | |
1128 | } | |
1129 | ||
1130 | manager_dispatch_load_queue(m); | |
1131 | ||
595ed347 MS |
1132 | LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) { |
1133 | Swap *swap = SWAP(u); | |
e04aad61 LP |
1134 | |
1135 | if (!swap->is_active) { | |
1136 | /* This has just been deactivated */ | |
1137 | ||
1138 | swap->from_proc_swaps = false; | |
1139 | swap_unset_proc_swaps(swap); | |
1140 | ||
1141 | switch (swap->state) { | |
1142 | ||
1143 | case SWAP_ACTIVE: | |
e1770af8 | 1144 | swap_enter_dead(swap, SWAP_SUCCESS); |
e04aad61 LP |
1145 | break; |
1146 | ||
1147 | default: | |
1148 | swap_set_state(swap, swap->state); | |
1149 | break; | |
1150 | } | |
1151 | ||
1152 | } else if (swap->just_activated) { | |
1153 | ||
1154 | /* New swap entry */ | |
1155 | ||
1156 | switch (swap->state) { | |
1157 | ||
1158 | case SWAP_DEAD: | |
1159 | case SWAP_FAILED: | |
e1770af8 | 1160 | swap_enter_active(swap, SWAP_SUCCESS); |
e04aad61 LP |
1161 | break; |
1162 | ||
1163 | default: | |
1164 | /* Nothing really changed, but let's | |
1165 | * issue an notification call | |
1166 | * nonetheless, in case somebody is | |
1167 | * waiting for this. */ | |
1168 | swap_set_state(swap, swap->state); | |
1169 | break; | |
1170 | } | |
1171 | } | |
1172 | ||
1173 | /* Reset the flags for later calls */ | |
1174 | swap->is_active = swap->just_activated = false; | |
1175 | } | |
1176 | ||
1177 | return 1; | |
1178 | } | |
1179 | ||
1180 | static Unit *swap_following(Unit *u) { | |
1181 | Swap *s = SWAP(u); | |
1182 | Swap *other, *first = NULL; | |
1183 | ||
1184 | assert(s); | |
1185 | ||
1186 | if (streq_ptr(s->what, s->parameters_proc_swaps.what)) | |
1187 | return NULL; | |
1188 | ||
1189 | /* Make everybody follow the unit that's named after the swap | |
1190 | * device in the kernel */ | |
1191 | ||
1192 | LIST_FOREACH_AFTER(same_proc_swaps, other, s) | |
1193 | if (streq_ptr(other->what, other->parameters_proc_swaps.what)) | |
1194 | return UNIT(other); | |
1195 | ||
1196 | LIST_FOREACH_BEFORE(same_proc_swaps, other, s) { | |
1197 | if (streq_ptr(other->what, other->parameters_proc_swaps.what)) | |
1198 | return UNIT(other); | |
1199 | ||
1200 | first = other; | |
1201 | } | |
1202 | ||
1203 | return UNIT(first); | |
07b0b134 ML |
1204 | } |
1205 | ||
6210e7fc LP |
1206 | static int swap_following_set(Unit *u, Set **_set) { |
1207 | Swap *s = SWAP(u); | |
1208 | Swap *other; | |
1209 | Set *set; | |
1210 | int r; | |
1211 | ||
1212 | assert(s); | |
1213 | assert(_set); | |
1214 | ||
1215 | if (LIST_JUST_US(same_proc_swaps, s)) { | |
1216 | *_set = NULL; | |
1217 | return 0; | |
1218 | } | |
1219 | ||
1220 | if (!(set = set_new(NULL, NULL))) | |
1221 | return -ENOMEM; | |
1222 | ||
1223 | LIST_FOREACH_AFTER(same_proc_swaps, other, s) | |
1224 | if ((r = set_put(set, other)) < 0) | |
1225 | goto fail; | |
1226 | ||
1227 | LIST_FOREACH_BEFORE(same_proc_swaps, other, s) | |
1228 | if ((r = set_put(set, other)) < 0) | |
1229 | goto fail; | |
1230 | ||
1231 | *_set = set; | |
1232 | return 1; | |
1233 | ||
1234 | fail: | |
1235 | set_free(set); | |
1236 | return r; | |
1237 | } | |
1238 | ||
07b0b134 ML |
1239 | static void swap_shutdown(Manager *m) { |
1240 | assert(m); | |
1241 | ||
1242 | if (m->proc_swaps) { | |
1243 | fclose(m->proc_swaps); | |
1244 | m->proc_swaps = NULL; | |
1245 | } | |
e04aad61 LP |
1246 | |
1247 | hashmap_free(m->swaps_by_proc_swaps); | |
1248 | m->swaps_by_proc_swaps = NULL; | |
07b0b134 ML |
1249 | } |
1250 | ||
07b0b134 ML |
1251 | static int swap_enumerate(Manager *m) { |
1252 | int r; | |
4e434314 | 1253 | struct epoll_event ev; |
07b0b134 ML |
1254 | assert(m); |
1255 | ||
4e434314 | 1256 | if (!m->proc_swaps) { |
4e85aff4 | 1257 | if (!(m->proc_swaps = fopen("/proc/swaps", "re"))) |
3f858732 | 1258 | return (errno == ENOENT) ? 0 : -errno; |
07b0b134 | 1259 | |
4e434314 LP |
1260 | m->swap_watch.type = WATCH_SWAP; |
1261 | m->swap_watch.fd = fileno(m->proc_swaps); | |
1262 | ||
1263 | zero(ev); | |
1264 | ev.events = EPOLLPRI; | |
1265 | ev.data.ptr = &m->swap_watch; | |
1266 | ||
1267 | if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->swap_watch.fd, &ev) < 0) | |
1268 | return -errno; | |
1269 | } | |
1270 | ||
e04aad61 LP |
1271 | /* We rely on mount.c to load /etc/fstab for us */ |
1272 | ||
1273 | if ((r = swap_load_proc_swaps(m, false)) < 0) | |
07b0b134 ML |
1274 | swap_shutdown(m); |
1275 | ||
1276 | return r; | |
1277 | } | |
1278 | ||
fdf20a31 | 1279 | static void swap_reset_failed(Unit *u) { |
5632e374 LP |
1280 | Swap *s = SWAP(u); |
1281 | ||
1282 | assert(s); | |
1283 | ||
fdf20a31 | 1284 | if (s->state == SWAP_FAILED) |
5632e374 | 1285 | swap_set_state(s, SWAP_DEAD); |
e04aad61 | 1286 | |
e1770af8 | 1287 | s->result = SWAP_SUCCESS; |
5632e374 LP |
1288 | } |
1289 | ||
8a0867d6 LP |
1290 | static int swap_kill(Unit *u, KillWho who, KillMode mode, int signo, DBusError *error) { |
1291 | Swap *s = SWAP(u); | |
1292 | int r = 0; | |
1293 | Set *pid_set = NULL; | |
1294 | ||
1295 | assert(s); | |
1296 | ||
1297 | if (who == KILL_MAIN) { | |
1298 | dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "Swap units have no main processes"); | |
a17204af | 1299 | return -ESRCH; |
8a0867d6 LP |
1300 | } |
1301 | ||
1302 | if (s->control_pid <= 0 && who == KILL_CONTROL) { | |
1303 | dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "No control process to kill"); | |
a17204af | 1304 | return -ESRCH; |
8a0867d6 LP |
1305 | } |
1306 | ||
3611581e LP |
1307 | if (who == KILL_CONTROL || who == KILL_ALL) |
1308 | if (s->control_pid > 0) | |
1309 | if (kill(s->control_pid, signo) < 0) | |
1310 | r = -errno; | |
8a0867d6 | 1311 | |
3611581e | 1312 | if (who == KILL_ALL && mode == KILL_CONTROL_GROUP) { |
8a0867d6 LP |
1313 | int q; |
1314 | ||
1315 | if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func))) | |
1316 | return -ENOMEM; | |
1317 | ||
1318 | /* Exclude the control pid from being killed via the cgroup */ | |
1319 | if (s->control_pid > 0) | |
1320 | if ((q = set_put(pid_set, LONG_TO_PTR(s->control_pid))) < 0) { | |
1321 | r = q; | |
1322 | goto finish; | |
1323 | } | |
1324 | ||
ecedd90f LP |
1325 | q = cgroup_bonding_kill_list(UNIT(s)->cgroup_bondings, signo, false, pid_set, NULL); |
1326 | if (q < 0) | |
3611581e | 1327 | if (q != -EAGAIN && q != -ESRCH && q != -ENOENT) |
8a0867d6 LP |
1328 | r = q; |
1329 | } | |
1330 | ||
1331 | finish: | |
1332 | if (pid_set) | |
1333 | set_free(pid_set); | |
1334 | ||
1335 | return r; | |
1336 | } | |
1337 | ||
5632e374 LP |
1338 | static const char* const swap_state_table[_SWAP_STATE_MAX] = { |
1339 | [SWAP_DEAD] = "dead", | |
e04aad61 | 1340 | [SWAP_ACTIVATING] = "activating", |
5632e374 | 1341 | [SWAP_ACTIVE] = "active", |
e04aad61 LP |
1342 | [SWAP_DEACTIVATING] = "deactivating", |
1343 | [SWAP_ACTIVATING_SIGTERM] = "activating-sigterm", | |
1344 | [SWAP_ACTIVATING_SIGKILL] = "activating-sigkill", | |
1345 | [SWAP_DEACTIVATING_SIGTERM] = "deactivating-sigterm", | |
1346 | [SWAP_DEACTIVATING_SIGKILL] = "deactivating-sigkill", | |
fdf20a31 | 1347 | [SWAP_FAILED] = "failed" |
5632e374 LP |
1348 | }; |
1349 | ||
1350 | DEFINE_STRING_TABLE_LOOKUP(swap_state, SwapState); | |
1351 | ||
e04aad61 LP |
1352 | static const char* const swap_exec_command_table[_SWAP_EXEC_COMMAND_MAX] = { |
1353 | [SWAP_EXEC_ACTIVATE] = "ExecActivate", | |
1354 | [SWAP_EXEC_DEACTIVATE] = "ExecDeactivate", | |
1355 | }; | |
1356 | ||
1357 | DEFINE_STRING_TABLE_LOOKUP(swap_exec_command, SwapExecCommand); | |
1358 | ||
e1770af8 LP |
1359 | static const char* const swap_result_table[_SWAP_RESULT_MAX] = { |
1360 | [SWAP_SUCCESS] = "success", | |
1361 | [SWAP_FAILURE_RESOURCES] = "resources", | |
1362 | [SWAP_FAILURE_TIMEOUT] = "timeout", | |
1363 | [SWAP_FAILURE_EXIT_CODE] = "exit-code", | |
1364 | [SWAP_FAILURE_SIGNAL] = "signal", | |
1365 | [SWAP_FAILURE_CORE_DUMP] = "core-dump" | |
1366 | }; | |
1367 | ||
1368 | DEFINE_STRING_TABLE_LOOKUP(swap_result, SwapResult); | |
1369 | ||
07b0b134 ML |
1370 | const UnitVTable swap_vtable = { |
1371 | .suffix = ".swap", | |
7d17cfbc | 1372 | .object_size = sizeof(Swap), |
f975e971 LP |
1373 | .sections = |
1374 | "Unit\0" | |
1375 | "Swap\0" | |
1376 | "Install\0", | |
07b0b134 | 1377 | |
e04aad61 | 1378 | .no_alias = true, |
07b0b134 | 1379 | .no_instances = true, |
9e58ff9c | 1380 | .show_status = true, |
07b0b134 | 1381 | |
4e85aff4 | 1382 | .init = swap_init, |
07b0b134 | 1383 | .load = swap_load, |
6e620bec | 1384 | .done = swap_done, |
07b0b134 ML |
1385 | |
1386 | .coldplug = swap_coldplug, | |
1387 | ||
1388 | .dump = swap_dump, | |
1389 | ||
1390 | .start = swap_start, | |
1391 | .stop = swap_stop, | |
1392 | ||
8a0867d6 LP |
1393 | .kill = swap_kill, |
1394 | ||
07b0b134 ML |
1395 | .serialize = swap_serialize, |
1396 | .deserialize_item = swap_deserialize_item, | |
1397 | ||
1398 | .active_state = swap_active_state, | |
1399 | .sub_state_to_string = swap_sub_state_to_string, | |
1400 | ||
1401 | .check_gc = swap_check_gc, | |
1402 | ||
e04aad61 LP |
1403 | .sigchld_event = swap_sigchld_event, |
1404 | .timer_event = swap_timer_event, | |
1405 | ||
1406 | .reset_failed = swap_reset_failed, | |
1407 | ||
c4e2ceae | 1408 | .bus_interface = "org.freedesktop.systemd1.Swap", |
07b0b134 | 1409 | .bus_message_handler = bus_swap_message_handler, |
c4e2ceae | 1410 | .bus_invalidating_properties = bus_swap_invalidating_properties, |
07b0b134 | 1411 | |
e04aad61 | 1412 | .following = swap_following, |
6210e7fc | 1413 | .following_set = swap_following_set, |
5632e374 | 1414 | |
6e620bec LP |
1415 | .enumerate = swap_enumerate, |
1416 | .shutdown = swap_shutdown | |
07b0b134 | 1417 | }; |