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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 | ||
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); | |
0a494f1f | 86 | s->exec_context.std_output = EXEC_OUTPUT_KMSG; |
e04aad61 | 87 | |
4e85aff4 | 88 | s->parameters_etc_fstab.priority = s->parameters_proc_swaps.priority = s->parameters_fragment.priority = -1; |
e04aad61 LP |
89 | |
90 | s->timer_watch.type = WATCH_INVALID; | |
91 | ||
92 | s->control_command_id = _MOUNT_EXEC_COMMAND_INVALID; | |
93 | } | |
94 | ||
95 | static void swap_unwatch_control_pid(Swap *s) { | |
96 | assert(s); | |
97 | ||
98 | if (s->control_pid <= 0) | |
99 | return; | |
100 | ||
101 | unit_unwatch_pid(UNIT(s), s->control_pid); | |
102 | s->control_pid = 0; | |
6e620bec LP |
103 | } |
104 | ||
4e85aff4 LP |
105 | static void swap_done(Unit *u) { |
106 | Swap *s = SWAP(u); | |
07b0b134 | 107 | |
4e85aff4 | 108 | assert(s); |
07b0b134 | 109 | |
e04aad61 LP |
110 | swap_unset_proc_swaps(s); |
111 | ||
4e85aff4 | 112 | free(s->what); |
e04aad61 LP |
113 | s->what = NULL; |
114 | ||
4e85aff4 | 115 | free(s->parameters_etc_fstab.what); |
4e85aff4 | 116 | free(s->parameters_fragment.what); |
e04aad61 LP |
117 | s->parameters_etc_fstab.what = s->parameters_fragment.what = NULL; |
118 | ||
119 | exec_context_done(&s->exec_context); | |
120 | exec_command_done_array(s->exec_command, _SWAP_EXEC_COMMAND_MAX); | |
121 | s->control_command = NULL; | |
122 | ||
123 | swap_unwatch_control_pid(s); | |
124 | ||
125 | unit_unwatch_timer(u, &s->timer_watch); | |
07b0b134 ML |
126 | } |
127 | ||
6e2ef85b LP |
128 | int swap_add_one_mount_link(Swap *s, Mount *m) { |
129 | int r; | |
130 | ||
131 | assert(s); | |
132 | assert(m); | |
133 | ||
134 | if (s->meta.load_state != UNIT_LOADED || | |
135 | m->meta.load_state != UNIT_LOADED) | |
136 | return 0; | |
137 | ||
8407a5d0 LP |
138 | if (is_device_path(s->what)) |
139 | return 0; | |
140 | ||
6e2ef85b LP |
141 | if (!path_startswith(s->what, m->where)) |
142 | return 0; | |
143 | ||
2c966c03 | 144 | if ((r = unit_add_two_dependencies(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true)) < 0) |
6e2ef85b LP |
145 | return r; |
146 | ||
147 | return 0; | |
148 | } | |
149 | ||
150 | static int swap_add_mount_links(Swap *s) { | |
151 | Meta *other; | |
152 | int r; | |
153 | ||
154 | assert(s); | |
155 | ||
156 | LIST_FOREACH(units_per_type, other, s->meta.manager->units_per_type[UNIT_MOUNT]) | |
157 | if ((r = swap_add_one_mount_link(s, (Mount*) other)) < 0) | |
158 | return r; | |
159 | ||
160 | return 0; | |
161 | } | |
162 | ||
07b0b134 | 163 | static int swap_add_target_links(Swap *s) { |
07b0b134 | 164 | Unit *tu; |
4e85aff4 | 165 | SwapParameters *p; |
07b0b134 ML |
166 | int r; |
167 | ||
4e85aff4 LP |
168 | assert(s); |
169 | ||
170 | if (s->from_fragment) | |
171 | p = &s->parameters_fragment; | |
172 | else if (s->from_etc_fstab) | |
173 | p = &s->parameters_etc_fstab; | |
174 | else | |
175 | return 0; | |
176 | ||
398ef8ba | 177 | if ((r = manager_load_unit(s->meta.manager, SPECIAL_SWAP_TARGET, NULL, NULL, &tu)) < 0) |
07b0b134 ML |
178 | return r; |
179 | ||
81bf310e | 180 | if (!p->noauto && |
85385610 | 181 | !p->nofail && |
81bf310e | 182 | (p->handle || s->meta.manager->swap_auto) && |
510051fc | 183 | s->from_etc_fstab && |
81bf310e | 184 | s->meta.manager->running_as == MANAGER_SYSTEM) |
6e2ef85b LP |
185 | if ((r = unit_add_dependency(tu, UNIT_WANTS, UNIT(s), true)) < 0) |
186 | return r; | |
07b0b134 ML |
187 | |
188 | return unit_add_dependency(UNIT(s), UNIT_BEFORE, tu, true); | |
189 | } | |
190 | ||
173a8d04 LP |
191 | static int swap_add_device_links(Swap *s) { |
192 | SwapParameters *p; | |
193 | ||
194 | assert(s); | |
195 | ||
196 | if (!s->what) | |
197 | return 0; | |
198 | ||
199 | if (s->from_fragment) | |
200 | p = &s->parameters_fragment; | |
201 | else if (s->from_etc_fstab) | |
202 | p = &s->parameters_etc_fstab; | |
203 | else | |
204 | return 0; | |
205 | ||
cfcfd4ae LP |
206 | if (is_device_path(s->what)) |
207 | return unit_add_node_link(UNIT(s), s->what, | |
208 | !p->noauto && p->nofail && | |
209 | s->meta.manager->running_as == MANAGER_SYSTEM); | |
210 | else | |
211 | /* File based swap devices need to be ordered after | |
212 | * remount-rootfs.service, since they might need a | |
213 | * writable file system. */ | |
214 | return unit_add_dependency_by_name(UNIT(s), UNIT_AFTER, SPECIAL_REMOUNT_ROOTFS_SERVICE, NULL, true); | |
173a8d04 LP |
215 | } |
216 | ||
2edd4434 LP |
217 | static int swap_add_default_dependencies(Swap *s) { |
218 | int r; | |
219 | ||
220 | assert(s); | |
221 | ||
222 | if (s->meta.manager->running_as == MANAGER_SYSTEM) { | |
223 | ||
ead8e478 | 224 | if ((r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true)) < 0) |
e04aad61 | 225 | return r; |
2edd4434 LP |
226 | } |
227 | ||
228 | return 0; | |
229 | } | |
230 | ||
4e85aff4 LP |
231 | static int swap_verify(Swap *s) { |
232 | bool b; | |
233 | char *e; | |
234 | ||
4cd1fbcc | 235 | if (s->meta.load_state != UNIT_LOADED) |
4e85aff4 LP |
236 | return 0; |
237 | ||
238 | if (!(e = unit_name_from_path(s->what, ".swap"))) | |
239 | return -ENOMEM; | |
240 | ||
241 | b = unit_has_name(UNIT(s), e); | |
242 | free(e); | |
243 | ||
244 | if (!b) { | |
4cd1fbcc | 245 | log_error("%s: Value of \"What\" and unit name do not match, not loading.\n", s->meta.id); |
4e85aff4 LP |
246 | return -EINVAL; |
247 | } | |
248 | ||
e04aad61 LP |
249 | if (s->exec_context.pam_name && s->exec_context.kill_mode != KILL_CONTROL_GROUP) { |
250 | log_error("%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing.", s->meta.id); | |
251 | return -EINVAL; | |
252 | } | |
253 | ||
4e85aff4 LP |
254 | return 0; |
255 | } | |
256 | ||
07b0b134 ML |
257 | static int swap_load(Unit *u) { |
258 | int r; | |
259 | Swap *s = SWAP(u); | |
260 | ||
261 | assert(s); | |
262 | assert(u->meta.load_state == UNIT_STUB); | |
263 | ||
264 | /* Load a .swap file */ | |
265 | if ((r = unit_load_fragment_and_dropin_optional(u)) < 0) | |
266 | return r; | |
267 | ||
268 | if (u->meta.load_state == UNIT_LOADED) { | |
27abbe82 LP |
269 | if ((r = unit_add_exec_dependencies(u, &s->exec_context)) < 0) |
270 | return r; | |
4e85aff4 LP |
271 | |
272 | if (s->meta.fragment_path) | |
273 | s->from_fragment = true; | |
274 | ||
275 | if (!s->what) { | |
276 | if (s->parameters_fragment.what) | |
277 | s->what = strdup(s->parameters_fragment.what); | |
278 | else if (s->parameters_etc_fstab.what) | |
279 | s->what = strdup(s->parameters_etc_fstab.what); | |
280 | else if (s->parameters_proc_swaps.what) | |
281 | s->what = strdup(s->parameters_proc_swaps.what); | |
282 | else | |
283 | s->what = unit_name_to_path(u->meta.id); | |
284 | ||
285 | if (!s->what) | |
07b0b134 | 286 | return -ENOMEM; |
4e85aff4 | 287 | } |
07b0b134 ML |
288 | |
289 | path_kill_slashes(s->what); | |
290 | ||
4e85aff4 LP |
291 | if (!s->meta.description) |
292 | if ((r = unit_set_description(u, s->what)) < 0) | |
293 | return r; | |
294 | ||
173a8d04 | 295 | if ((r = swap_add_device_links(s)) < 0) |
07b0b134 ML |
296 | return r; |
297 | ||
6e2ef85b LP |
298 | if ((r = swap_add_mount_links(s)) < 0) |
299 | return r; | |
07b0b134 ML |
300 | |
301 | if ((r = swap_add_target_links(s)) < 0) | |
302 | return r; | |
2edd4434 | 303 | |
d686d8a9 | 304 | if ((r = unit_add_default_cgroups(u)) < 0) |
f1a1cd64 LP |
305 | return r; |
306 | ||
2edd4434 LP |
307 | if (s->meta.default_dependencies) |
308 | if ((r = swap_add_default_dependencies(s)) < 0) | |
309 | return r; | |
07b0b134 ML |
310 | } |
311 | ||
312 | return swap_verify(s); | |
313 | } | |
314 | ||
4e85aff4 LP |
315 | int swap_add_one( |
316 | Manager *m, | |
317 | const char *what, | |
e04aad61 | 318 | const char *what_proc_swaps, |
4e85aff4 LP |
319 | int priority, |
320 | bool noauto, | |
173a8d04 | 321 | bool nofail, |
4e85aff4 | 322 | bool handle, |
e04aad61 LP |
323 | bool set_flags) { |
324 | ||
4e85aff4 | 325 | Unit *u = NULL; |
e04aad61 | 326 | char *e = NULL, *wp = NULL; |
2c7c6144 | 327 | bool delete = false; |
07b0b134 | 328 | int r; |
4e85aff4 LP |
329 | SwapParameters *p; |
330 | ||
331 | assert(m); | |
332 | assert(what); | |
07b0b134 ML |
333 | |
334 | if (!(e = unit_name_from_path(what, ".swap"))) | |
335 | return -ENOMEM; | |
336 | ||
e04aad61 LP |
337 | u = manager_get_unit(m, e); |
338 | ||
339 | if (what_proc_swaps && | |
340 | u && | |
341 | SWAP(u)->from_proc_swaps && | |
342 | !path_equal(SWAP(u)->parameters_proc_swaps.what, what_proc_swaps)) | |
343 | return -EEXIST; | |
4e85aff4 LP |
344 | |
345 | if (!u) { | |
07b0b134 ML |
346 | delete = true; |
347 | ||
348 | if (!(u = unit_new(m))) { | |
349 | free(e); | |
350 | return -ENOMEM; | |
351 | } | |
e04aad61 LP |
352 | |
353 | if ((r = unit_add_name(u, e)) < 0) | |
354 | goto fail; | |
355 | ||
356 | if (!(SWAP(u)->what = strdup(what))) { | |
357 | r = -ENOMEM; | |
358 | goto fail; | |
359 | } | |
360 | ||
361 | unit_add_to_load_queue(u); | |
4e85aff4 LP |
362 | } else |
363 | delete = false; | |
07b0b134 | 364 | |
e04aad61 LP |
365 | if (what_proc_swaps) { |
366 | Swap *first; | |
07b0b134 | 367 | |
4e85aff4 | 368 | p = &SWAP(u)->parameters_proc_swaps; |
e04aad61 LP |
369 | |
370 | if (!p->what) { | |
371 | if (!(wp = strdup(what_proc_swaps))) { | |
372 | r = -ENOMEM; | |
373 | goto fail; | |
374 | } | |
375 | ||
376 | if (!m->swaps_by_proc_swaps) | |
377 | if (!(m->swaps_by_proc_swaps = hashmap_new(string_hash_func, string_compare_func))) { | |
378 | r = -ENOMEM; | |
379 | goto fail; | |
380 | } | |
381 | ||
382 | free(p->what); | |
383 | p->what = wp; | |
384 | ||
385 | first = hashmap_get(m->swaps_by_proc_swaps, wp); | |
386 | LIST_PREPEND(Swap, same_proc_swaps, first, SWAP(u)); | |
387 | ||
388 | if ((r = hashmap_replace(m->swaps_by_proc_swaps, wp, first)) < 0) | |
389 | goto fail; | |
390 | } | |
391 | ||
392 | if (set_flags) { | |
393 | SWAP(u)->is_active = true; | |
394 | SWAP(u)->just_activated = !SWAP(u)->from_proc_swaps; | |
395 | } | |
396 | ||
4e85aff4 | 397 | SWAP(u)->from_proc_swaps = true; |
e04aad61 | 398 | |
4e85aff4 LP |
399 | } else { |
400 | p = &SWAP(u)->parameters_etc_fstab; | |
e04aad61 LP |
401 | |
402 | if (!(wp = strdup(what))) { | |
403 | r = -ENOMEM; | |
404 | goto fail; | |
405 | } | |
406 | ||
407 | free(p->what); | |
408 | p->what = wp; | |
409 | ||
4e85aff4 LP |
410 | SWAP(u)->from_etc_fstab = true; |
411 | } | |
07b0b134 | 412 | |
4e85aff4 LP |
413 | p->priority = priority; |
414 | p->noauto = noauto; | |
173a8d04 | 415 | p->nofail = nofail; |
4e85aff4 | 416 | p->handle = handle; |
07b0b134 | 417 | |
4e85aff4 | 418 | unit_add_to_dbus_queue(u); |
07b0b134 | 419 | |
4e85aff4 | 420 | free(e); |
07b0b134 ML |
421 | |
422 | return 0; | |
423 | ||
424 | fail: | |
e04aad61 LP |
425 | log_warning("Failed to load swap unit: %s", strerror(-r)); |
426 | ||
427 | free(wp); | |
4e85aff4 LP |
428 | free(e); |
429 | ||
430 | if (delete && u) | |
07b0b134 ML |
431 | unit_free(u); |
432 | ||
4e85aff4 | 433 | return r; |
07b0b134 ML |
434 | } |
435 | ||
e04aad61 LP |
436 | static int swap_process_new_swap(Manager *m, const char *device, int prio, bool set_flags) { |
437 | struct stat st; | |
438 | int r = 0, k; | |
439 | ||
440 | assert(m); | |
441 | ||
442 | if (stat(device, &st) >= 0 && S_ISBLK(st.st_mode)) { | |
443 | struct udev_device *d; | |
444 | const char *dn; | |
445 | struct udev_list_entry *item = NULL, *first = NULL; | |
446 | ||
447 | /* So this is a proper swap device. Create swap units | |
448 | * for all names this swap device is known under */ | |
449 | ||
450 | if (!(d = udev_device_new_from_devnum(m->udev, 'b', st.st_rdev))) | |
451 | return -ENOMEM; | |
452 | ||
453 | if ((dn = udev_device_get_devnode(d))) | |
454 | r = swap_add_one(m, dn, device, prio, false, false, false, set_flags); | |
455 | ||
456 | /* Add additional units for all symlinks */ | |
457 | first = udev_device_get_devlinks_list_entry(d); | |
458 | udev_list_entry_foreach(item, first) { | |
459 | const char *p; | |
460 | ||
461 | /* Don't bother with the /dev/block links */ | |
462 | p = udev_list_entry_get_name(item); | |
463 | ||
464 | if (path_startswith(p, "/dev/block/")) | |
465 | continue; | |
466 | ||
467 | if (stat(p, &st) >= 0) | |
468 | if ((!S_ISBLK(st.st_mode)) || st.st_rdev != udev_device_get_devnum(d)) | |
469 | continue; | |
470 | ||
471 | if ((k = swap_add_one(m, p, device, prio, false, false, false, set_flags)) < 0) | |
472 | r = k; | |
473 | } | |
474 | ||
475 | udev_device_unref(d); | |
476 | } | |
477 | ||
478 | if ((k = swap_add_one(m, device, device, prio, false, false, false, set_flags)) < 0) | |
479 | r = k; | |
480 | ||
481 | return r; | |
482 | } | |
483 | ||
07b0b134 ML |
484 | static void swap_set_state(Swap *s, SwapState state) { |
485 | SwapState old_state; | |
e04aad61 | 486 | |
07b0b134 ML |
487 | assert(s); |
488 | ||
489 | old_state = s->state; | |
490 | s->state = state; | |
491 | ||
e04aad61 LP |
492 | if (state != SWAP_ACTIVATING && |
493 | state != SWAP_ACTIVATING_SIGTERM && | |
494 | state != SWAP_ACTIVATING_SIGKILL && | |
495 | state != SWAP_DEACTIVATING && | |
496 | state != SWAP_DEACTIVATING_SIGTERM && | |
497 | state != SWAP_DEACTIVATING_SIGKILL) { | |
498 | unit_unwatch_timer(UNIT(s), &s->timer_watch); | |
499 | swap_unwatch_control_pid(s); | |
500 | s->control_command = NULL; | |
501 | s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; | |
502 | } | |
503 | ||
07b0b134 ML |
504 | if (state != old_state) |
505 | log_debug("%s changed %s -> %s", | |
4cd1fbcc | 506 | s->meta.id, |
07b0b134 ML |
507 | swap_state_to_string(old_state), |
508 | swap_state_to_string(state)); | |
509 | ||
e2f3b44c | 510 | unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], true); |
07b0b134 ML |
511 | } |
512 | ||
513 | static int swap_coldplug(Unit *u) { | |
514 | Swap *s = SWAP(u); | |
515 | SwapState new_state = SWAP_DEAD; | |
e04aad61 | 516 | int r; |
07b0b134 ML |
517 | |
518 | assert(s); | |
519 | assert(s->state == SWAP_DEAD); | |
520 | ||
521 | if (s->deserialized_state != s->state) | |
522 | new_state = s->deserialized_state; | |
4e85aff4 | 523 | else if (s->from_proc_swaps) |
07b0b134 ML |
524 | new_state = SWAP_ACTIVE; |
525 | ||
e04aad61 LP |
526 | if (new_state != s->state) { |
527 | ||
528 | if (new_state == SWAP_ACTIVATING || | |
529 | new_state == SWAP_ACTIVATING_SIGTERM || | |
530 | new_state == SWAP_ACTIVATING_SIGKILL || | |
531 | new_state == SWAP_DEACTIVATING || | |
532 | new_state == SWAP_DEACTIVATING_SIGTERM || | |
533 | new_state == SWAP_DEACTIVATING_SIGKILL) { | |
534 | ||
535 | if (s->control_pid <= 0) | |
536 | return -EBADMSG; | |
537 | ||
538 | if ((r = unit_watch_pid(UNIT(s), s->control_pid)) < 0) | |
539 | return r; | |
540 | ||
541 | if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0) | |
542 | return r; | |
543 | } | |
544 | ||
4e85aff4 | 545 | swap_set_state(s, new_state); |
e04aad61 | 546 | } |
07b0b134 ML |
547 | |
548 | return 0; | |
549 | } | |
550 | ||
551 | static void swap_dump(Unit *u, FILE *f, const char *prefix) { | |
552 | Swap *s = SWAP(u); | |
4e85aff4 | 553 | SwapParameters *p; |
07b0b134 ML |
554 | |
555 | assert(s); | |
4e85aff4 LP |
556 | assert(f); |
557 | ||
558 | if (s->from_proc_swaps) | |
559 | p = &s->parameters_proc_swaps; | |
560 | else if (s->from_fragment) | |
561 | p = &s->parameters_fragment; | |
562 | else | |
563 | p = &s->parameters_etc_fstab; | |
07b0b134 ML |
564 | |
565 | fprintf(f, | |
4e85aff4 | 566 | "%sSwap State: %s\n" |
07b0b134 ML |
567 | "%sWhat: %s\n" |
568 | "%sPriority: %i\n" | |
4e85aff4 | 569 | "%sNoAuto: %s\n" |
173a8d04 | 570 | "%sNoFail: %s\n" |
4e85aff4 LP |
571 | "%sHandle: %s\n" |
572 | "%sFrom /etc/fstab: %s\n" | |
573 | "%sFrom /proc/swaps: %s\n" | |
574 | "%sFrom fragment: %s\n", | |
07b0b134 ML |
575 | prefix, swap_state_to_string(s->state), |
576 | prefix, s->what, | |
4e85aff4 LP |
577 | prefix, p->priority, |
578 | prefix, yes_no(p->noauto), | |
173a8d04 | 579 | prefix, yes_no(p->nofail), |
4e85aff4 LP |
580 | prefix, yes_no(p->handle), |
581 | prefix, yes_no(s->from_etc_fstab), | |
582 | prefix, yes_no(s->from_proc_swaps), | |
583 | prefix, yes_no(s->from_fragment)); | |
e04aad61 LP |
584 | |
585 | if (s->control_pid > 0) | |
586 | fprintf(f, | |
587 | "%sControl PID: %lu\n", | |
588 | prefix, (unsigned long) s->control_pid); | |
589 | ||
590 | exec_context_dump(&s->exec_context, f, prefix); | |
591 | } | |
592 | ||
593 | static int swap_spawn(Swap *s, ExecCommand *c, pid_t *_pid) { | |
594 | pid_t pid; | |
595 | int r; | |
596 | ||
597 | assert(s); | |
598 | assert(c); | |
599 | assert(_pid); | |
600 | ||
601 | if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0) | |
602 | goto fail; | |
603 | ||
604 | if ((r = exec_spawn(c, | |
605 | NULL, | |
606 | &s->exec_context, | |
607 | NULL, 0, | |
608 | s->meta.manager->environment, | |
609 | true, | |
610 | true, | |
611 | true, | |
612 | s->meta.manager->confirm_spawn, | |
613 | s->meta.cgroup_bondings, | |
614 | &pid)) < 0) | |
615 | goto fail; | |
616 | ||
617 | if ((r = unit_watch_pid(UNIT(s), pid)) < 0) | |
618 | /* FIXME: we need to do something here */ | |
619 | goto fail; | |
620 | ||
621 | *_pid = pid; | |
622 | ||
623 | return 0; | |
624 | ||
625 | fail: | |
626 | unit_unwatch_timer(UNIT(s), &s->timer_watch); | |
627 | ||
628 | return r; | |
07b0b134 ML |
629 | } |
630 | ||
631 | static void swap_enter_dead(Swap *s, bool success) { | |
632 | assert(s); | |
633 | ||
e04aad61 LP |
634 | if (!success) |
635 | s->failure = true; | |
636 | ||
637 | swap_set_state(s, s->failure ? SWAP_FAILED : SWAP_DEAD); | |
07b0b134 ML |
638 | } |
639 | ||
e04aad61 LP |
640 | static void swap_enter_active(Swap *s, bool success) { |
641 | assert(s); | |
642 | ||
643 | if (!success) | |
644 | s->failure = true; | |
645 | ||
646 | swap_set_state(s, SWAP_ACTIVE); | |
647 | } | |
648 | ||
649 | static void swap_enter_signal(Swap *s, SwapState state, bool success) { | |
07b0b134 | 650 | int r; |
e04aad61 LP |
651 | Set *pid_set = NULL; |
652 | bool wait_for_exit = false; | |
07b0b134 ML |
653 | |
654 | assert(s); | |
e04aad61 LP |
655 | |
656 | if (!success) | |
657 | s->failure = true; | |
658 | ||
659 | if (s->exec_context.kill_mode != KILL_NONE) { | |
660 | int sig = (state == SWAP_ACTIVATING_SIGTERM || | |
661 | state == SWAP_DEACTIVATING_SIGTERM) ? s->exec_context.kill_signal : SIGKILL; | |
662 | ||
663 | if (s->control_pid > 0) { | |
cd25cce9 | 664 | if (kill_and_sigcont(s->control_pid, sig) < 0 && errno != ESRCH) |
e04aad61 LP |
665 | |
666 | log_warning("Failed to kill control process %li: %m", (long) s->control_pid); | |
667 | else | |
668 | wait_for_exit = true; | |
669 | } | |
670 | ||
671 | if (s->exec_context.kill_mode == KILL_CONTROL_GROUP) { | |
672 | ||
673 | if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func))) { | |
674 | r = -ENOMEM; | |
675 | goto fail; | |
676 | } | |
677 | ||
678 | /* Exclude the control pid from being killed via the cgroup */ | |
679 | if (s->control_pid > 0) | |
680 | if ((r = set_put(pid_set, LONG_TO_PTR(s->control_pid))) < 0) | |
681 | goto fail; | |
682 | ||
430c18ed | 683 | if ((r = cgroup_bonding_kill_list(s->meta.cgroup_bondings, sig, true, pid_set)) < 0) { |
e04aad61 LP |
684 | if (r != -EAGAIN && r != -ESRCH && r != -ENOENT) |
685 | log_warning("Failed to kill control group: %s", strerror(-r)); | |
686 | } else if (r > 0) | |
687 | wait_for_exit = true; | |
688 | ||
689 | set_free(pid_set); | |
690 | } | |
691 | } | |
692 | ||
693 | if (wait_for_exit) { | |
694 | if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0) | |
695 | goto fail; | |
696 | ||
697 | swap_set_state(s, state); | |
698 | } else | |
699 | swap_enter_dead(s, true); | |
700 | ||
701 | return; | |
702 | ||
703 | fail: | |
704 | log_warning("%s failed to kill processes: %s", s->meta.id, strerror(-r)); | |
705 | ||
706 | swap_enter_dead(s, false); | |
707 | ||
708 | if (pid_set) | |
709 | set_free(pid_set); | |
710 | } | |
711 | ||
712 | static void swap_enter_activating(Swap *s) { | |
713 | int r, priority; | |
714 | ||
715 | assert(s); | |
716 | ||
717 | s->control_command_id = SWAP_EXEC_ACTIVATE; | |
718 | s->control_command = s->exec_command + SWAP_EXEC_ACTIVATE; | |
07b0b134 | 719 | |
4e85aff4 LP |
720 | if (s->from_fragment) |
721 | priority = s->parameters_fragment.priority; | |
722 | else if (s->from_etc_fstab) | |
723 | priority = s->parameters_etc_fstab.priority; | |
e04aad61 LP |
724 | else |
725 | priority = -1; | |
4e85aff4 | 726 | |
e04aad61 LP |
727 | if (priority >= 0) { |
728 | char p[LINE_MAX]; | |
07b0b134 | 729 | |
e04aad61 LP |
730 | snprintf(p, sizeof(p), "%i", priority); |
731 | char_array_0(p); | |
07b0b134 | 732 | |
e04aad61 LP |
733 | r = exec_command_set( |
734 | s->control_command, | |
735 | "/sbin/swapon", | |
736 | "-p", | |
737 | p, | |
738 | s->what, | |
739 | NULL); | |
740 | } else | |
741 | r = exec_command_set( | |
742 | s->control_command, | |
743 | "/sbin/swapon", | |
744 | s->what, | |
745 | NULL); | |
746 | ||
747 | if (r < 0) | |
748 | goto fail; | |
749 | ||
750 | swap_unwatch_control_pid(s); | |
751 | ||
752 | if ((r = swap_spawn(s, s->control_command, &s->control_pid)) < 0) | |
753 | goto fail; | |
754 | ||
755 | swap_set_state(s, SWAP_ACTIVATING); | |
756 | ||
757 | return; | |
758 | ||
759 | fail: | |
760 | log_warning("%s failed to run 'swapon' task: %s", s->meta.id, strerror(-r)); | |
761 | swap_enter_dead(s, false); | |
762 | } | |
763 | ||
764 | static void swap_enter_deactivating(Swap *s, bool success) { | |
765 | int r; | |
766 | ||
767 | assert(s); | |
768 | ||
769 | if (!success) | |
770 | s->failure = true; | |
771 | ||
772 | s->control_command_id = SWAP_EXEC_DEACTIVATE; | |
773 | s->control_command = s->exec_command + SWAP_EXEC_DEACTIVATE; | |
774 | ||
775 | if ((r = exec_command_set( | |
776 | s->control_command, | |
777 | "/sbin/swapoff", | |
778 | s->what, | |
779 | NULL)) < 0) | |
780 | goto fail; | |
781 | ||
782 | swap_unwatch_control_pid(s); | |
783 | ||
784 | if ((r = swap_spawn(s, s->control_command, &s->control_pid)) < 0) | |
785 | goto fail; | |
786 | ||
787 | swap_set_state(s, SWAP_DEACTIVATING); | |
788 | ||
789 | return; | |
790 | ||
791 | fail: | |
792 | log_warning("%s failed to run 'swapoff' task: %s", s->meta.id, strerror(-r)); | |
793 | swap_enter_active(s, false); | |
794 | } | |
795 | ||
796 | static int swap_start(Unit *u) { | |
797 | Swap *s = SWAP(u); | |
798 | ||
799 | assert(s); | |
800 | ||
801 | /* We cannot fulfill this request right now, try again later | |
802 | * please! */ | |
803 | ||
804 | if (s->state == SWAP_DEACTIVATING || | |
805 | s->state == SWAP_DEACTIVATING_SIGTERM || | |
806 | s->state == SWAP_DEACTIVATING_SIGKILL || | |
807 | s->state == SWAP_ACTIVATING_SIGTERM || | |
808 | s->state == SWAP_ACTIVATING_SIGKILL) | |
809 | return -EAGAIN; | |
810 | ||
811 | if (s->state == SWAP_ACTIVATING) | |
812 | return 0; | |
813 | ||
814 | assert(s->state == SWAP_DEAD || s->state == SWAP_FAILED); | |
815 | ||
816 | s->failure = false; | |
817 | swap_enter_activating(s); | |
07b0b134 ML |
818 | return 0; |
819 | } | |
820 | ||
821 | static int swap_stop(Unit *u) { | |
822 | Swap *s = SWAP(u); | |
07b0b134 ML |
823 | |
824 | assert(s); | |
825 | ||
e04aad61 LP |
826 | if (s->state == SWAP_DEACTIVATING || |
827 | s->state == SWAP_DEACTIVATING_SIGTERM || | |
828 | s->state == SWAP_DEACTIVATING_SIGKILL || | |
829 | s->state == SWAP_ACTIVATING_SIGTERM || | |
830 | s->state == SWAP_ACTIVATING_SIGKILL) | |
831 | return 0; | |
07b0b134 | 832 | |
e04aad61 LP |
833 | assert(s->state == SWAP_ACTIVATING || |
834 | s->state == SWAP_ACTIVE); | |
07b0b134 | 835 | |
e04aad61 | 836 | swap_enter_deactivating(s, true); |
07b0b134 ML |
837 | return 0; |
838 | } | |
839 | ||
840 | static int swap_serialize(Unit *u, FILE *f, FDSet *fds) { | |
841 | Swap *s = SWAP(u); | |
842 | ||
843 | assert(s); | |
844 | assert(f); | |
845 | assert(fds); | |
846 | ||
847 | unit_serialize_item(u, f, "state", swap_state_to_string(s->state)); | |
e04aad61 LP |
848 | unit_serialize_item(u, f, "failure", yes_no(s->failure)); |
849 | ||
850 | if (s->control_pid > 0) | |
851 | unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) s->control_pid); | |
852 | ||
853 | if (s->control_command_id >= 0) | |
854 | unit_serialize_item(u, f, "control-command", swap_exec_command_to_string(s->control_command_id)); | |
07b0b134 ML |
855 | |
856 | return 0; | |
857 | } | |
858 | ||
859 | static int swap_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
860 | Swap *s = SWAP(u); | |
861 | ||
862 | assert(s); | |
863 | assert(fds); | |
864 | ||
865 | if (streq(key, "state")) { | |
866 | SwapState state; | |
867 | ||
868 | if ((state = swap_state_from_string(value)) < 0) | |
869 | log_debug("Failed to parse state value %s", value); | |
870 | else | |
871 | s->deserialized_state = state; | |
e04aad61 LP |
872 | } else if (streq(key, "failure")) { |
873 | int b; | |
874 | ||
875 | if ((b = parse_boolean(value)) < 0) | |
876 | log_debug("Failed to parse failure value %s", value); | |
877 | else | |
878 | s->failure = b || s->failure; | |
879 | ||
880 | } else if (streq(key, "control-pid")) { | |
881 | pid_t pid; | |
882 | ||
883 | if (parse_pid(value, &pid) < 0) | |
884 | log_debug("Failed to parse control-pid value %s", value); | |
885 | else | |
886 | s->control_pid = pid; | |
887 | ||
888 | } else if (streq(key, "control-command")) { | |
889 | SwapExecCommand id; | |
890 | ||
891 | if ((id = swap_exec_command_from_string(value)) < 0) | |
892 | log_debug("Failed to parse exec-command value %s", value); | |
893 | else { | |
894 | s->control_command_id = id; | |
895 | s->control_command = s->exec_command + id; | |
896 | } | |
897 | ||
07b0b134 ML |
898 | } else |
899 | log_debug("Unknown serialization key '%s'", key); | |
900 | ||
901 | return 0; | |
902 | } | |
903 | ||
904 | static UnitActiveState swap_active_state(Unit *u) { | |
905 | assert(u); | |
906 | ||
907 | return state_translation_table[SWAP(u)->state]; | |
908 | } | |
909 | ||
910 | static const char *swap_sub_state_to_string(Unit *u) { | |
911 | assert(u); | |
912 | ||
913 | return swap_state_to_string(SWAP(u)->state); | |
914 | } | |
915 | ||
916 | static bool swap_check_gc(Unit *u) { | |
917 | Swap *s = SWAP(u); | |
918 | ||
919 | assert(s); | |
920 | ||
4e85aff4 | 921 | return s->from_etc_fstab || s->from_proc_swaps; |
07b0b134 ML |
922 | } |
923 | ||
e04aad61 LP |
924 | static void swap_sigchld_event(Unit *u, pid_t pid, int code, int status) { |
925 | Swap *s = SWAP(u); | |
926 | bool success; | |
927 | ||
928 | assert(s); | |
929 | assert(pid >= 0); | |
930 | ||
931 | if (pid != s->control_pid) | |
932 | return; | |
933 | ||
934 | s->control_pid = 0; | |
935 | ||
936 | success = is_clean_exit(code, status); | |
937 | s->failure = s->failure || !success; | |
938 | ||
939 | if (s->control_command) { | |
940 | exec_status_exit(&s->control_command->exec_status, pid, code, status, s->exec_context.utmp_id); | |
941 | s->control_command = NULL; | |
942 | s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; | |
943 | } | |
944 | ||
945 | log_full(success ? LOG_DEBUG : LOG_NOTICE, | |
946 | "%s swap process exited, code=%s status=%i", u->meta.id, sigchld_code_to_string(code), status); | |
947 | ||
948 | switch (s->state) { | |
949 | ||
950 | case SWAP_ACTIVATING: | |
951 | case SWAP_ACTIVATING_SIGTERM: | |
952 | case SWAP_ACTIVATING_SIGKILL: | |
953 | ||
954 | if (success) | |
955 | swap_enter_active(s, true); | |
956 | else | |
957 | swap_enter_dead(s, false); | |
958 | break; | |
959 | ||
960 | case SWAP_DEACTIVATING: | |
961 | case SWAP_DEACTIVATING_SIGKILL: | |
962 | case SWAP_DEACTIVATING_SIGTERM: | |
963 | ||
964 | if (success) | |
965 | swap_enter_dead(s, true); | |
966 | else | |
967 | swap_enter_dead(s, false); | |
968 | break; | |
969 | ||
970 | default: | |
971 | assert_not_reached("Uh, control process died at wrong time."); | |
972 | } | |
973 | ||
974 | /* Notify clients about changed exit status */ | |
975 | unit_add_to_dbus_queue(u); | |
976 | ||
977 | /* Request a reload of /proc/swaps, so that following units | |
978 | * can follow our state change */ | |
979 | u->meta.manager->request_reload = true; | |
980 | } | |
981 | ||
982 | static void swap_timer_event(Unit *u, uint64_t elapsed, Watch *w) { | |
983 | Swap *s = SWAP(u); | |
984 | ||
985 | assert(s); | |
986 | assert(elapsed == 1); | |
987 | assert(w == &s->timer_watch); | |
988 | ||
989 | switch (s->state) { | |
990 | ||
991 | case SWAP_ACTIVATING: | |
992 | log_warning("%s activation timed out. Stopping.", u->meta.id); | |
993 | swap_enter_signal(s, SWAP_ACTIVATING_SIGTERM, false); | |
994 | break; | |
995 | ||
996 | case SWAP_DEACTIVATING: | |
997 | log_warning("%s deactivation timed out. Stopping.", u->meta.id); | |
998 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGTERM, false); | |
999 | break; | |
1000 | ||
1001 | case SWAP_ACTIVATING_SIGTERM: | |
ba035df2 LP |
1002 | if (s->exec_context.send_sigkill) { |
1003 | log_warning("%s activation timed out. Killing.", u->meta.id); | |
1004 | swap_enter_signal(s, SWAP_ACTIVATING_SIGKILL, false); | |
1005 | } else { | |
1006 | log_warning("%s activation timed out. Skipping SIGKILL. Ignoring.", u->meta.id); | |
1007 | swap_enter_dead(s, false); | |
1008 | } | |
e04aad61 LP |
1009 | break; |
1010 | ||
1011 | case SWAP_DEACTIVATING_SIGTERM: | |
ba035df2 LP |
1012 | if (s->exec_context.send_sigkill) { |
1013 | log_warning("%s deactivation timed out. Killing.", u->meta.id); | |
1014 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, false); | |
1015 | } else { | |
1016 | log_warning("%s deactivation timed out. Skipping SIGKILL. Ignoring.", u->meta.id); | |
1017 | swap_enter_dead(s, false); | |
1018 | } | |
e04aad61 LP |
1019 | break; |
1020 | ||
1021 | case SWAP_ACTIVATING_SIGKILL: | |
1022 | case SWAP_DEACTIVATING_SIGKILL: | |
1023 | log_warning("%s swap process still around after SIGKILL. Ignoring.", u->meta.id); | |
1024 | swap_enter_dead(s, false); | |
1025 | break; | |
1026 | ||
1027 | default: | |
1028 | assert_not_reached("Timeout at wrong time."); | |
1029 | } | |
1030 | } | |
1031 | ||
1032 | static int swap_load_proc_swaps(Manager *m, bool set_flags) { | |
1033 | unsigned i; | |
1034 | int r = 0; | |
1035 | ||
1036 | assert(m); | |
1037 | ||
07b0b134 | 1038 | rewind(m->proc_swaps); |
bab45044 | 1039 | |
4e85aff4 | 1040 | (void) fscanf(m->proc_swaps, "%*s %*s %*s %*s %*s\n"); |
07b0b134 | 1041 | |
e04aad61 | 1042 | for (i = 1;; i++) { |
07b0b134 ML |
1043 | char *dev = NULL, *d; |
1044 | int prio = 0, k; | |
1045 | ||
4e85aff4 | 1046 | if ((k = fscanf(m->proc_swaps, |
e04aad61 LP |
1047 | "%ms " /* device/file */ |
1048 | "%*s " /* type of swap */ | |
1049 | "%*s " /* swap size */ | |
1050 | "%*s " /* used */ | |
4e85aff4 LP |
1051 | "%i\n", /* priority */ |
1052 | &dev, &prio)) != 2) { | |
07b0b134 | 1053 | |
07b0b134 | 1054 | if (k == EOF) |
4e85aff4 | 1055 | break; |
07b0b134 | 1056 | |
e04aad61 | 1057 | log_warning("Failed to parse /proc/swaps:%u.", i); |
07b0b134 | 1058 | free(dev); |
e04aad61 | 1059 | continue; |
07b0b134 | 1060 | } |
07b0b134 | 1061 | |
4e85aff4 | 1062 | d = cunescape(dev); |
07b0b134 | 1063 | free(dev); |
4e85aff4 LP |
1064 | |
1065 | if (!d) | |
1066 | return -ENOMEM; | |
1067 | ||
e04aad61 | 1068 | k = swap_process_new_swap(m, d, prio, set_flags); |
07b0b134 ML |
1069 | free(d); |
1070 | ||
1071 | if (k < 0) | |
e04aad61 | 1072 | r = k; |
07b0b134 ML |
1073 | } |
1074 | ||
e04aad61 LP |
1075 | return r; |
1076 | } | |
1077 | ||
1078 | int swap_dispatch_reload(Manager *m) { | |
4e434314 | 1079 | /* This function should go as soon as the kernel properly notifies us */ |
e04aad61 LP |
1080 | |
1081 | if (_likely_(!m->request_reload)) | |
1082 | return 0; | |
1083 | ||
1084 | m->request_reload = false; | |
1085 | ||
4e434314 LP |
1086 | return swap_fd_event(m, EPOLLPRI); |
1087 | } | |
1088 | ||
1089 | int swap_fd_event(Manager *m, int events) { | |
1090 | Meta *meta; | |
1091 | int r; | |
1092 | ||
1093 | assert(m); | |
1094 | assert(events & EPOLLPRI); | |
1095 | ||
bd40a2d8 | 1096 | if ((r = swap_load_proc_swaps(m, true)) < 0) { |
e04aad61 LP |
1097 | log_error("Failed to reread /proc/swaps: %s", strerror(-r)); |
1098 | ||
1099 | /* Reset flags, just in case, for late calls */ | |
1100 | LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_SWAP]) { | |
1101 | Swap *swap = (Swap*) meta; | |
1102 | ||
1103 | swap->is_active = swap->just_activated = false; | |
1104 | } | |
1105 | ||
1106 | return 0; | |
1107 | } | |
1108 | ||
1109 | manager_dispatch_load_queue(m); | |
1110 | ||
1111 | LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_SWAP]) { | |
1112 | Swap *swap = (Swap*) meta; | |
1113 | ||
1114 | if (!swap->is_active) { | |
1115 | /* This has just been deactivated */ | |
1116 | ||
1117 | swap->from_proc_swaps = false; | |
1118 | swap_unset_proc_swaps(swap); | |
1119 | ||
1120 | switch (swap->state) { | |
1121 | ||
1122 | case SWAP_ACTIVE: | |
1123 | swap_enter_dead(swap, true); | |
1124 | break; | |
1125 | ||
1126 | default: | |
1127 | swap_set_state(swap, swap->state); | |
1128 | break; | |
1129 | } | |
1130 | ||
1131 | } else if (swap->just_activated) { | |
1132 | ||
1133 | /* New swap entry */ | |
1134 | ||
1135 | switch (swap->state) { | |
1136 | ||
1137 | case SWAP_DEAD: | |
1138 | case SWAP_FAILED: | |
1139 | swap_enter_active(swap, true); | |
1140 | break; | |
1141 | ||
1142 | default: | |
1143 | /* Nothing really changed, but let's | |
1144 | * issue an notification call | |
1145 | * nonetheless, in case somebody is | |
1146 | * waiting for this. */ | |
1147 | swap_set_state(swap, swap->state); | |
1148 | break; | |
1149 | } | |
1150 | } | |
1151 | ||
1152 | /* Reset the flags for later calls */ | |
1153 | swap->is_active = swap->just_activated = false; | |
1154 | } | |
1155 | ||
1156 | return 1; | |
1157 | } | |
1158 | ||
1159 | static Unit *swap_following(Unit *u) { | |
1160 | Swap *s = SWAP(u); | |
1161 | Swap *other, *first = NULL; | |
1162 | ||
1163 | assert(s); | |
1164 | ||
1165 | if (streq_ptr(s->what, s->parameters_proc_swaps.what)) | |
1166 | return NULL; | |
1167 | ||
1168 | /* Make everybody follow the unit that's named after the swap | |
1169 | * device in the kernel */ | |
1170 | ||
1171 | LIST_FOREACH_AFTER(same_proc_swaps, other, s) | |
1172 | if (streq_ptr(other->what, other->parameters_proc_swaps.what)) | |
1173 | return UNIT(other); | |
1174 | ||
1175 | LIST_FOREACH_BEFORE(same_proc_swaps, other, s) { | |
1176 | if (streq_ptr(other->what, other->parameters_proc_swaps.what)) | |
1177 | return UNIT(other); | |
1178 | ||
1179 | first = other; | |
1180 | } | |
1181 | ||
1182 | return UNIT(first); | |
07b0b134 ML |
1183 | } |
1184 | ||
6210e7fc LP |
1185 | static int swap_following_set(Unit *u, Set **_set) { |
1186 | Swap *s = SWAP(u); | |
1187 | Swap *other; | |
1188 | Set *set; | |
1189 | int r; | |
1190 | ||
1191 | assert(s); | |
1192 | assert(_set); | |
1193 | ||
1194 | if (LIST_JUST_US(same_proc_swaps, s)) { | |
1195 | *_set = NULL; | |
1196 | return 0; | |
1197 | } | |
1198 | ||
1199 | if (!(set = set_new(NULL, NULL))) | |
1200 | return -ENOMEM; | |
1201 | ||
1202 | LIST_FOREACH_AFTER(same_proc_swaps, other, s) | |
1203 | if ((r = set_put(set, other)) < 0) | |
1204 | goto fail; | |
1205 | ||
1206 | LIST_FOREACH_BEFORE(same_proc_swaps, other, s) | |
1207 | if ((r = set_put(set, other)) < 0) | |
1208 | goto fail; | |
1209 | ||
1210 | *_set = set; | |
1211 | return 1; | |
1212 | ||
1213 | fail: | |
1214 | set_free(set); | |
1215 | return r; | |
1216 | } | |
1217 | ||
07b0b134 ML |
1218 | static void swap_shutdown(Manager *m) { |
1219 | assert(m); | |
1220 | ||
1221 | if (m->proc_swaps) { | |
1222 | fclose(m->proc_swaps); | |
1223 | m->proc_swaps = NULL; | |
1224 | } | |
e04aad61 LP |
1225 | |
1226 | hashmap_free(m->swaps_by_proc_swaps); | |
1227 | m->swaps_by_proc_swaps = NULL; | |
07b0b134 ML |
1228 | } |
1229 | ||
07b0b134 ML |
1230 | static int swap_enumerate(Manager *m) { |
1231 | int r; | |
4e434314 | 1232 | struct epoll_event ev; |
07b0b134 ML |
1233 | assert(m); |
1234 | ||
4e434314 | 1235 | if (!m->proc_swaps) { |
4e85aff4 LP |
1236 | if (!(m->proc_swaps = fopen("/proc/swaps", "re"))) |
1237 | return -errno; | |
07b0b134 | 1238 | |
4e434314 LP |
1239 | m->swap_watch.type = WATCH_SWAP; |
1240 | m->swap_watch.fd = fileno(m->proc_swaps); | |
1241 | ||
1242 | zero(ev); | |
1243 | ev.events = EPOLLPRI; | |
1244 | ev.data.ptr = &m->swap_watch; | |
1245 | ||
1246 | if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->swap_watch.fd, &ev) < 0) | |
1247 | return -errno; | |
1248 | } | |
1249 | ||
e04aad61 LP |
1250 | /* We rely on mount.c to load /etc/fstab for us */ |
1251 | ||
1252 | if ((r = swap_load_proc_swaps(m, false)) < 0) | |
07b0b134 ML |
1253 | swap_shutdown(m); |
1254 | ||
1255 | return r; | |
1256 | } | |
1257 | ||
fdf20a31 | 1258 | static void swap_reset_failed(Unit *u) { |
5632e374 LP |
1259 | Swap *s = SWAP(u); |
1260 | ||
1261 | assert(s); | |
1262 | ||
fdf20a31 | 1263 | if (s->state == SWAP_FAILED) |
5632e374 | 1264 | swap_set_state(s, SWAP_DEAD); |
e04aad61 LP |
1265 | |
1266 | s->failure = false; | |
5632e374 LP |
1267 | } |
1268 | ||
8a0867d6 LP |
1269 | static int swap_kill(Unit *u, KillWho who, KillMode mode, int signo, DBusError *error) { |
1270 | Swap *s = SWAP(u); | |
1271 | int r = 0; | |
1272 | Set *pid_set = NULL; | |
1273 | ||
1274 | assert(s); | |
1275 | ||
1276 | if (who == KILL_MAIN) { | |
1277 | dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "Swap units have no main processes"); | |
1278 | return -EINVAL; | |
1279 | } | |
1280 | ||
1281 | if (s->control_pid <= 0 && who == KILL_CONTROL) { | |
1282 | dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "No control process to kill"); | |
1283 | return -ENOENT; | |
1284 | } | |
1285 | ||
1286 | if (s->control_pid > 0) | |
cd25cce9 | 1287 | if (kill(s->control_pid, signo) < 0) |
8a0867d6 LP |
1288 | r = -errno; |
1289 | ||
1290 | if (mode == KILL_CONTROL_GROUP) { | |
1291 | int q; | |
1292 | ||
1293 | if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func))) | |
1294 | return -ENOMEM; | |
1295 | ||
1296 | /* Exclude the control pid from being killed via the cgroup */ | |
1297 | if (s->control_pid > 0) | |
1298 | if ((q = set_put(pid_set, LONG_TO_PTR(s->control_pid))) < 0) { | |
1299 | r = q; | |
1300 | goto finish; | |
1301 | } | |
1302 | ||
430c18ed | 1303 | if ((q = cgroup_bonding_kill_list(s->meta.cgroup_bondings, signo, false, pid_set)) < 0) |
8a0867d6 LP |
1304 | if (r != -EAGAIN && r != -ESRCH && r != -ENOENT) |
1305 | r = q; | |
1306 | } | |
1307 | ||
1308 | finish: | |
1309 | if (pid_set) | |
1310 | set_free(pid_set); | |
1311 | ||
1312 | return r; | |
1313 | } | |
1314 | ||
5632e374 LP |
1315 | static const char* const swap_state_table[_SWAP_STATE_MAX] = { |
1316 | [SWAP_DEAD] = "dead", | |
e04aad61 | 1317 | [SWAP_ACTIVATING] = "activating", |
5632e374 | 1318 | [SWAP_ACTIVE] = "active", |
e04aad61 LP |
1319 | [SWAP_DEACTIVATING] = "deactivating", |
1320 | [SWAP_ACTIVATING_SIGTERM] = "activating-sigterm", | |
1321 | [SWAP_ACTIVATING_SIGKILL] = "activating-sigkill", | |
1322 | [SWAP_DEACTIVATING_SIGTERM] = "deactivating-sigterm", | |
1323 | [SWAP_DEACTIVATING_SIGKILL] = "deactivating-sigkill", | |
fdf20a31 | 1324 | [SWAP_FAILED] = "failed" |
5632e374 LP |
1325 | }; |
1326 | ||
1327 | DEFINE_STRING_TABLE_LOOKUP(swap_state, SwapState); | |
1328 | ||
e04aad61 LP |
1329 | static const char* const swap_exec_command_table[_SWAP_EXEC_COMMAND_MAX] = { |
1330 | [SWAP_EXEC_ACTIVATE] = "ExecActivate", | |
1331 | [SWAP_EXEC_DEACTIVATE] = "ExecDeactivate", | |
1332 | }; | |
1333 | ||
1334 | DEFINE_STRING_TABLE_LOOKUP(swap_exec_command, SwapExecCommand); | |
1335 | ||
07b0b134 ML |
1336 | const UnitVTable swap_vtable = { |
1337 | .suffix = ".swap", | |
1338 | ||
e04aad61 | 1339 | .no_alias = true, |
07b0b134 | 1340 | .no_instances = true, |
6e620bec | 1341 | .no_isolate = true, |
9e58ff9c | 1342 | .show_status = true, |
07b0b134 | 1343 | |
4e85aff4 | 1344 | .init = swap_init, |
07b0b134 | 1345 | .load = swap_load, |
6e620bec | 1346 | .done = swap_done, |
07b0b134 ML |
1347 | |
1348 | .coldplug = swap_coldplug, | |
1349 | ||
1350 | .dump = swap_dump, | |
1351 | ||
1352 | .start = swap_start, | |
1353 | .stop = swap_stop, | |
1354 | ||
8a0867d6 LP |
1355 | .kill = swap_kill, |
1356 | ||
07b0b134 ML |
1357 | .serialize = swap_serialize, |
1358 | .deserialize_item = swap_deserialize_item, | |
1359 | ||
1360 | .active_state = swap_active_state, | |
1361 | .sub_state_to_string = swap_sub_state_to_string, | |
1362 | ||
1363 | .check_gc = swap_check_gc, | |
1364 | ||
e04aad61 LP |
1365 | .sigchld_event = swap_sigchld_event, |
1366 | .timer_event = swap_timer_event, | |
1367 | ||
1368 | .reset_failed = swap_reset_failed, | |
1369 | ||
c4e2ceae | 1370 | .bus_interface = "org.freedesktop.systemd1.Swap", |
07b0b134 | 1371 | .bus_message_handler = bus_swap_message_handler, |
c4e2ceae | 1372 | .bus_invalidating_properties = bus_swap_invalidating_properties, |
07b0b134 | 1373 | |
e04aad61 | 1374 | .following = swap_following, |
6210e7fc | 1375 | .following_set = swap_following_set, |
5632e374 | 1376 | |
6e620bec LP |
1377 | .enumerate = swap_enumerate, |
1378 | .shutdown = swap_shutdown | |
07b0b134 | 1379 | }; |