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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" |
9eb977db | 41 | #include "path-util.h" |
07b0b134 ML |
42 | |
43 | static const UnitActiveState state_translation_table[_SWAP_STATE_MAX] = { | |
44 | [SWAP_DEAD] = UNIT_INACTIVE, | |
e04aad61 | 45 | [SWAP_ACTIVATING] = UNIT_ACTIVATING, |
07b0b134 | 46 | [SWAP_ACTIVE] = UNIT_ACTIVE, |
e04aad61 LP |
47 | [SWAP_DEACTIVATING] = UNIT_DEACTIVATING, |
48 | [SWAP_ACTIVATING_SIGTERM] = UNIT_DEACTIVATING, | |
49 | [SWAP_ACTIVATING_SIGKILL] = UNIT_DEACTIVATING, | |
50 | [SWAP_DEACTIVATING_SIGTERM] = UNIT_DEACTIVATING, | |
51 | [SWAP_DEACTIVATING_SIGKILL] = UNIT_DEACTIVATING, | |
fdf20a31 | 52 | [SWAP_FAILED] = UNIT_FAILED |
07b0b134 ML |
53 | }; |
54 | ||
e04aad61 LP |
55 | static void swap_unset_proc_swaps(Swap *s) { |
56 | Swap *first; | |
57 | ||
58 | assert(s); | |
59 | ||
60 | if (!s->parameters_proc_swaps.what) | |
61 | return; | |
62 | ||
63 | /* Remove this unit from the chain of swaps which share the | |
64 | * same kernel swap device. */ | |
65 | ||
1124fe6f | 66 | first = hashmap_get(UNIT(s)->manager->swaps_by_proc_swaps, s->parameters_proc_swaps.what); |
e04aad61 LP |
67 | LIST_REMOVE(Swap, same_proc_swaps, first, s); |
68 | ||
69 | if (first) | |
1124fe6f | 70 | hashmap_remove_and_replace(UNIT(s)->manager->swaps_by_proc_swaps, s->parameters_proc_swaps.what, first->parameters_proc_swaps.what, first); |
e04aad61 | 71 | else |
1124fe6f | 72 | hashmap_remove(UNIT(s)->manager->swaps_by_proc_swaps, s->parameters_proc_swaps.what); |
e04aad61 LP |
73 | |
74 | free(s->parameters_proc_swaps.what); | |
75 | s->parameters_proc_swaps.what = NULL; | |
76 | } | |
77 | ||
f6cebb3b | 78 | static void swap_init(Unit *u) { |
6e620bec LP |
79 | Swap *s = SWAP(u); |
80 | ||
81 | assert(s); | |
1124fe6f | 82 | assert(UNIT(s)->load_state == UNIT_STUB); |
6e620bec | 83 | |
e04aad61 LP |
84 | s->timeout_usec = DEFAULT_TIMEOUT_USEC; |
85 | ||
86 | exec_context_init(&s->exec_context); | |
ac155bb8 MS |
87 | s->exec_context.std_output = u->manager->default_std_output; |
88 | s->exec_context.std_error = u->manager->default_std_error; | |
e04aad61 | 89 | |
6b1dc2bd | 90 | s->parameters_proc_swaps.priority = s->parameters_fragment.priority = -1; |
e04aad61 LP |
91 | |
92 | s->timer_watch.type = WATCH_INVALID; | |
93 | ||
e1770af8 | 94 | s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; |
c8f4d764 | 95 | |
1124fe6f | 96 | UNIT(s)->ignore_on_isolate = true; |
e04aad61 LP |
97 | } |
98 | ||
99 | static void swap_unwatch_control_pid(Swap *s) { | |
100 | assert(s); | |
101 | ||
102 | if (s->control_pid <= 0) | |
103 | return; | |
104 | ||
105 | unit_unwatch_pid(UNIT(s), s->control_pid); | |
106 | s->control_pid = 0; | |
6e620bec LP |
107 | } |
108 | ||
4e85aff4 LP |
109 | static void swap_done(Unit *u) { |
110 | Swap *s = SWAP(u); | |
07b0b134 | 111 | |
4e85aff4 | 112 | assert(s); |
07b0b134 | 113 | |
e04aad61 LP |
114 | swap_unset_proc_swaps(s); |
115 | ||
4e85aff4 | 116 | free(s->what); |
e04aad61 LP |
117 | s->what = NULL; |
118 | ||
4e85aff4 | 119 | free(s->parameters_fragment.what); |
6b1dc2bd | 120 | s->parameters_fragment.what = NULL; |
e04aad61 LP |
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 ML |
167 | Unit *tu; |
168 | int r; | |
169 | ||
4e85aff4 LP |
170 | assert(s); |
171 | ||
6b1dc2bd | 172 | if (!s->from_fragment) |
4e85aff4 LP |
173 | return 0; |
174 | ||
1124fe6f | 175 | if ((r = manager_load_unit(UNIT(s)->manager, SPECIAL_SWAP_TARGET, NULL, NULL, &tu)) < 0) |
07b0b134 ML |
176 | return r; |
177 | ||
07b0b134 ML |
178 | return unit_add_dependency(UNIT(s), UNIT_BEFORE, tu, true); |
179 | } | |
180 | ||
173a8d04 LP |
181 | static int swap_add_device_links(Swap *s) { |
182 | SwapParameters *p; | |
183 | ||
184 | assert(s); | |
185 | ||
186 | if (!s->what) | |
187 | return 0; | |
188 | ||
189 | if (s->from_fragment) | |
190 | p = &s->parameters_fragment; | |
173a8d04 LP |
191 | else |
192 | return 0; | |
193 | ||
cfcfd4ae LP |
194 | if (is_device_path(s->what)) |
195 | return unit_add_node_link(UNIT(s), s->what, | |
196 | !p->noauto && p->nofail && | |
1124fe6f | 197 | UNIT(s)->manager->running_as == MANAGER_SYSTEM); |
cfcfd4ae LP |
198 | else |
199 | /* File based swap devices need to be ordered after | |
2b93b027 | 200 | * systemd-remount-fs.service, since they might need a |
cfcfd4ae | 201 | * writable file system. */ |
2b93b027 | 202 | return unit_add_dependency_by_name(UNIT(s), UNIT_AFTER, SPECIAL_REMOUNT_FS_SERVICE, NULL, true); |
173a8d04 LP |
203 | } |
204 | ||
2edd4434 LP |
205 | static int swap_add_default_dependencies(Swap *s) { |
206 | int r; | |
207 | ||
208 | assert(s); | |
209 | ||
6b1dc2bd LP |
210 | if (UNIT(s)->manager->running_as != MANAGER_SYSTEM) |
211 | return 0; | |
2edd4434 | 212 | |
6b1dc2bd LP |
213 | r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true); |
214 | if (r < 0) | |
215 | return r; | |
2edd4434 LP |
216 | |
217 | return 0; | |
218 | } | |
219 | ||
4e85aff4 LP |
220 | static int swap_verify(Swap *s) { |
221 | bool b; | |
222 | char *e; | |
223 | ||
1124fe6f | 224 | if (UNIT(s)->load_state != UNIT_LOADED) |
4e85aff4 LP |
225 | return 0; |
226 | ||
227 | if (!(e = unit_name_from_path(s->what, ".swap"))) | |
228 | return -ENOMEM; | |
229 | ||
230 | b = unit_has_name(UNIT(s), e); | |
231 | free(e); | |
232 | ||
233 | if (!b) { | |
1124fe6f | 234 | log_error("%s: Value of \"What\" and unit name do not match, not loading.\n", UNIT(s)->id); |
4e85aff4 LP |
235 | return -EINVAL; |
236 | } | |
237 | ||
e04aad61 | 238 | if (s->exec_context.pam_name && s->exec_context.kill_mode != KILL_CONTROL_GROUP) { |
1124fe6f | 239 | log_error("%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing.", UNIT(s)->id); |
e04aad61 LP |
240 | return -EINVAL; |
241 | } | |
242 | ||
4e85aff4 LP |
243 | return 0; |
244 | } | |
245 | ||
07b0b134 ML |
246 | static int swap_load(Unit *u) { |
247 | int r; | |
248 | Swap *s = SWAP(u); | |
249 | ||
250 | assert(s); | |
ac155bb8 | 251 | assert(u->load_state == UNIT_STUB); |
07b0b134 ML |
252 | |
253 | /* Load a .swap file */ | |
254 | if ((r = unit_load_fragment_and_dropin_optional(u)) < 0) | |
255 | return r; | |
256 | ||
ac155bb8 | 257 | if (u->load_state == UNIT_LOADED) { |
27abbe82 LP |
258 | if ((r = unit_add_exec_dependencies(u, &s->exec_context)) < 0) |
259 | return r; | |
4e85aff4 | 260 | |
1124fe6f | 261 | if (UNIT(s)->fragment_path) |
4e85aff4 LP |
262 | s->from_fragment = true; |
263 | ||
264 | if (!s->what) { | |
265 | if (s->parameters_fragment.what) | |
266 | s->what = strdup(s->parameters_fragment.what); | |
4e85aff4 LP |
267 | else if (s->parameters_proc_swaps.what) |
268 | s->what = strdup(s->parameters_proc_swaps.what); | |
269 | else | |
ac155bb8 | 270 | s->what = unit_name_to_path(u->id); |
4e85aff4 LP |
271 | |
272 | if (!s->what) | |
07b0b134 | 273 | return -ENOMEM; |
4e85aff4 | 274 | } |
07b0b134 ML |
275 | |
276 | path_kill_slashes(s->what); | |
277 | ||
1124fe6f | 278 | if (!UNIT(s)->description) |
4e85aff4 LP |
279 | if ((r = unit_set_description(u, s->what)) < 0) |
280 | return r; | |
281 | ||
173a8d04 | 282 | if ((r = swap_add_device_links(s)) < 0) |
07b0b134 ML |
283 | return r; |
284 | ||
6e2ef85b LP |
285 | if ((r = swap_add_mount_links(s)) < 0) |
286 | return r; | |
07b0b134 ML |
287 | |
288 | if ((r = swap_add_target_links(s)) < 0) | |
289 | return r; | |
2edd4434 | 290 | |
d686d8a9 | 291 | if ((r = unit_add_default_cgroups(u)) < 0) |
f1a1cd64 LP |
292 | return r; |
293 | ||
1124fe6f | 294 | if (UNIT(s)->default_dependencies) |
2edd4434 LP |
295 | if ((r = swap_add_default_dependencies(s)) < 0) |
296 | return r; | |
07b0b134 ML |
297 | } |
298 | ||
299 | return swap_verify(s); | |
300 | } | |
301 | ||
6b1dc2bd | 302 | static int swap_add_one( |
4e85aff4 LP |
303 | Manager *m, |
304 | const char *what, | |
e04aad61 | 305 | const char *what_proc_swaps, |
4e85aff4 LP |
306 | int priority, |
307 | bool noauto, | |
173a8d04 | 308 | bool nofail, |
e04aad61 LP |
309 | bool set_flags) { |
310 | ||
4e85aff4 | 311 | Unit *u = NULL; |
e04aad61 | 312 | char *e = NULL, *wp = NULL; |
2c7c6144 | 313 | bool delete = false; |
07b0b134 | 314 | int r; |
4e85aff4 | 315 | SwapParameters *p; |
6b1dc2bd | 316 | Swap *first; |
4e85aff4 LP |
317 | |
318 | assert(m); | |
319 | assert(what); | |
6b1dc2bd | 320 | assert(what_proc_swaps); |
07b0b134 | 321 | |
7d17cfbc MS |
322 | e = unit_name_from_path(what, ".swap"); |
323 | if (!e) | |
07b0b134 ML |
324 | return -ENOMEM; |
325 | ||
e04aad61 LP |
326 | u = manager_get_unit(m, e); |
327 | ||
6b1dc2bd | 328 | if (u && |
e04aad61 LP |
329 | SWAP(u)->from_proc_swaps && |
330 | !path_equal(SWAP(u)->parameters_proc_swaps.what, what_proc_swaps)) | |
331 | return -EEXIST; | |
4e85aff4 LP |
332 | |
333 | if (!u) { | |
07b0b134 ML |
334 | delete = true; |
335 | ||
7d17cfbc MS |
336 | u = unit_new(m, sizeof(Swap)); |
337 | if (!u) { | |
07b0b134 ML |
338 | free(e); |
339 | return -ENOMEM; | |
340 | } | |
e04aad61 | 341 | |
7d17cfbc MS |
342 | r = unit_add_name(u, e); |
343 | if (r < 0) | |
e04aad61 LP |
344 | goto fail; |
345 | ||
7d17cfbc MS |
346 | SWAP(u)->what = strdup(what); |
347 | if (!SWAP(u)->what) { | |
e04aad61 LP |
348 | r = -ENOMEM; |
349 | goto fail; | |
350 | } | |
351 | ||
352 | unit_add_to_load_queue(u); | |
4e85aff4 LP |
353 | } else |
354 | delete = false; | |
07b0b134 | 355 | |
6b1dc2bd | 356 | p = &SWAP(u)->parameters_proc_swaps; |
07b0b134 | 357 | |
6b1dc2bd LP |
358 | if (!p->what) { |
359 | if (!(wp = strdup(what_proc_swaps))) { | |
360 | r = -ENOMEM; | |
361 | goto fail; | |
362 | } | |
e04aad61 | 363 | |
6b1dc2bd LP |
364 | if (!m->swaps_by_proc_swaps) |
365 | if (!(m->swaps_by_proc_swaps = hashmap_new(string_hash_func, string_compare_func))) { | |
e04aad61 LP |
366 | r = -ENOMEM; |
367 | goto fail; | |
368 | } | |
369 | ||
6b1dc2bd LP |
370 | free(p->what); |
371 | p->what = wp; | |
e04aad61 | 372 | |
6b1dc2bd LP |
373 | first = hashmap_get(m->swaps_by_proc_swaps, wp); |
374 | LIST_PREPEND(Swap, same_proc_swaps, first, SWAP(u)); | |
e04aad61 | 375 | |
6b1dc2bd | 376 | if ((r = hashmap_replace(m->swaps_by_proc_swaps, wp, first)) < 0) |
e04aad61 | 377 | goto fail; |
6b1dc2bd | 378 | } |
e04aad61 | 379 | |
6b1dc2bd LP |
380 | if (set_flags) { |
381 | SWAP(u)->is_active = true; | |
382 | SWAP(u)->just_activated = !SWAP(u)->from_proc_swaps; | |
4e85aff4 | 383 | } |
07b0b134 | 384 | |
6b1dc2bd LP |
385 | SWAP(u)->from_proc_swaps = true; |
386 | ||
4e85aff4 LP |
387 | p->priority = priority; |
388 | p->noauto = noauto; | |
173a8d04 | 389 | p->nofail = nofail; |
07b0b134 | 390 | |
4e85aff4 | 391 | unit_add_to_dbus_queue(u); |
07b0b134 | 392 | |
4e85aff4 | 393 | free(e); |
07b0b134 ML |
394 | |
395 | return 0; | |
396 | ||
397 | fail: | |
e04aad61 LP |
398 | log_warning("Failed to load swap unit: %s", strerror(-r)); |
399 | ||
400 | free(wp); | |
4e85aff4 LP |
401 | free(e); |
402 | ||
403 | if (delete && u) | |
07b0b134 ML |
404 | unit_free(u); |
405 | ||
4e85aff4 | 406 | return r; |
07b0b134 ML |
407 | } |
408 | ||
e04aad61 LP |
409 | static int swap_process_new_swap(Manager *m, const char *device, int prio, bool set_flags) { |
410 | struct stat st; | |
411 | int r = 0, k; | |
412 | ||
413 | assert(m); | |
414 | ||
415 | if (stat(device, &st) >= 0 && S_ISBLK(st.st_mode)) { | |
416 | struct udev_device *d; | |
417 | const char *dn; | |
418 | struct udev_list_entry *item = NULL, *first = NULL; | |
419 | ||
420 | /* So this is a proper swap device. Create swap units | |
421 | * for all names this swap device is known under */ | |
422 | ||
423 | if (!(d = udev_device_new_from_devnum(m->udev, 'b', st.st_rdev))) | |
424 | return -ENOMEM; | |
425 | ||
8d8e9456 LP |
426 | dn = udev_device_get_devnode(d); |
427 | if (dn) | |
428 | r = swap_add_one(m, dn, device, prio, false, false, set_flags); | |
e04aad61 LP |
429 | |
430 | /* Add additional units for all symlinks */ | |
431 | first = udev_device_get_devlinks_list_entry(d); | |
432 | udev_list_entry_foreach(item, first) { | |
433 | const char *p; | |
434 | ||
435 | /* Don't bother with the /dev/block links */ | |
436 | p = udev_list_entry_get_name(item); | |
437 | ||
438 | if (path_startswith(p, "/dev/block/")) | |
439 | continue; | |
440 | ||
441 | if (stat(p, &st) >= 0) | |
442 | if ((!S_ISBLK(st.st_mode)) || st.st_rdev != udev_device_get_devnum(d)) | |
443 | continue; | |
444 | ||
8d8e9456 LP |
445 | k = swap_add_one(m, p, device, prio, false, false, set_flags); |
446 | if (k < 0) | |
e04aad61 LP |
447 | r = k; |
448 | } | |
449 | ||
450 | udev_device_unref(d); | |
451 | } | |
452 | ||
8d8e9456 LP |
453 | k = swap_add_one(m, device, device, prio, false, false, set_flags); |
454 | if (k < 0) | |
e04aad61 LP |
455 | r = k; |
456 | ||
457 | return r; | |
458 | } | |
459 | ||
07b0b134 ML |
460 | static void swap_set_state(Swap *s, SwapState state) { |
461 | SwapState old_state; | |
e04aad61 | 462 | |
07b0b134 ML |
463 | assert(s); |
464 | ||
465 | old_state = s->state; | |
466 | s->state = state; | |
467 | ||
e04aad61 LP |
468 | if (state != SWAP_ACTIVATING && |
469 | state != SWAP_ACTIVATING_SIGTERM && | |
470 | state != SWAP_ACTIVATING_SIGKILL && | |
471 | state != SWAP_DEACTIVATING && | |
472 | state != SWAP_DEACTIVATING_SIGTERM && | |
473 | state != SWAP_DEACTIVATING_SIGKILL) { | |
474 | unit_unwatch_timer(UNIT(s), &s->timer_watch); | |
475 | swap_unwatch_control_pid(s); | |
476 | s->control_command = NULL; | |
477 | s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; | |
478 | } | |
479 | ||
07b0b134 ML |
480 | if (state != old_state) |
481 | log_debug("%s changed %s -> %s", | |
1124fe6f | 482 | UNIT(s)->id, |
07b0b134 ML |
483 | swap_state_to_string(old_state), |
484 | swap_state_to_string(state)); | |
485 | ||
e2f3b44c | 486 | unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], true); |
07b0b134 ML |
487 | } |
488 | ||
489 | static int swap_coldplug(Unit *u) { | |
490 | Swap *s = SWAP(u); | |
491 | SwapState new_state = SWAP_DEAD; | |
e04aad61 | 492 | int r; |
07b0b134 ML |
493 | |
494 | assert(s); | |
495 | assert(s->state == SWAP_DEAD); | |
496 | ||
497 | if (s->deserialized_state != s->state) | |
498 | new_state = s->deserialized_state; | |
4e85aff4 | 499 | else if (s->from_proc_swaps) |
07b0b134 ML |
500 | new_state = SWAP_ACTIVE; |
501 | ||
e04aad61 LP |
502 | if (new_state != s->state) { |
503 | ||
504 | if (new_state == SWAP_ACTIVATING || | |
505 | new_state == SWAP_ACTIVATING_SIGTERM || | |
506 | new_state == SWAP_ACTIVATING_SIGKILL || | |
507 | new_state == SWAP_DEACTIVATING || | |
508 | new_state == SWAP_DEACTIVATING_SIGTERM || | |
509 | new_state == SWAP_DEACTIVATING_SIGKILL) { | |
510 | ||
511 | if (s->control_pid <= 0) | |
512 | return -EBADMSG; | |
513 | ||
514 | if ((r = unit_watch_pid(UNIT(s), s->control_pid)) < 0) | |
515 | return r; | |
516 | ||
517 | if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0) | |
518 | return r; | |
519 | } | |
520 | ||
4e85aff4 | 521 | swap_set_state(s, new_state); |
e04aad61 | 522 | } |
07b0b134 ML |
523 | |
524 | return 0; | |
525 | } | |
526 | ||
527 | static void swap_dump(Unit *u, FILE *f, const char *prefix) { | |
528 | Swap *s = SWAP(u); | |
4e85aff4 | 529 | SwapParameters *p; |
07b0b134 ML |
530 | |
531 | assert(s); | |
4e85aff4 LP |
532 | assert(f); |
533 | ||
534 | if (s->from_proc_swaps) | |
535 | p = &s->parameters_proc_swaps; | |
536 | else if (s->from_fragment) | |
537 | p = &s->parameters_fragment; | |
07b0b134 ML |
538 | |
539 | fprintf(f, | |
4e85aff4 | 540 | "%sSwap State: %s\n" |
e1770af8 | 541 | "%sResult: %s\n" |
07b0b134 ML |
542 | "%sWhat: %s\n" |
543 | "%sPriority: %i\n" | |
4e85aff4 | 544 | "%sNoAuto: %s\n" |
173a8d04 | 545 | "%sNoFail: %s\n" |
4e85aff4 LP |
546 | "%sFrom /proc/swaps: %s\n" |
547 | "%sFrom fragment: %s\n", | |
07b0b134 | 548 | prefix, swap_state_to_string(s->state), |
e1770af8 | 549 | prefix, swap_result_to_string(s->result), |
07b0b134 | 550 | prefix, s->what, |
4e85aff4 LP |
551 | prefix, p->priority, |
552 | prefix, yes_no(p->noauto), | |
173a8d04 | 553 | prefix, yes_no(p->nofail), |
4e85aff4 LP |
554 | prefix, yes_no(s->from_proc_swaps), |
555 | prefix, yes_no(s->from_fragment)); | |
e04aad61 LP |
556 | |
557 | if (s->control_pid > 0) | |
558 | fprintf(f, | |
559 | "%sControl PID: %lu\n", | |
560 | prefix, (unsigned long) s->control_pid); | |
561 | ||
562 | exec_context_dump(&s->exec_context, f, prefix); | |
563 | } | |
564 | ||
565 | static int swap_spawn(Swap *s, ExecCommand *c, pid_t *_pid) { | |
566 | pid_t pid; | |
567 | int r; | |
568 | ||
569 | assert(s); | |
570 | assert(c); | |
571 | assert(_pid); | |
572 | ||
573 | if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0) | |
574 | goto fail; | |
575 | ||
576 | if ((r = exec_spawn(c, | |
577 | NULL, | |
578 | &s->exec_context, | |
579 | NULL, 0, | |
1124fe6f | 580 | UNIT(s)->manager->environment, |
e04aad61 LP |
581 | true, |
582 | true, | |
583 | true, | |
1124fe6f MS |
584 | UNIT(s)->manager->confirm_spawn, |
585 | UNIT(s)->cgroup_bondings, | |
586 | UNIT(s)->cgroup_attributes, | |
ecedd90f | 587 | NULL, |
f2b68789 | 588 | NULL, |
e04aad61 LP |
589 | &pid)) < 0) |
590 | goto fail; | |
591 | ||
592 | if ((r = unit_watch_pid(UNIT(s), pid)) < 0) | |
593 | /* FIXME: we need to do something here */ | |
594 | goto fail; | |
595 | ||
596 | *_pid = pid; | |
597 | ||
598 | return 0; | |
599 | ||
600 | fail: | |
601 | unit_unwatch_timer(UNIT(s), &s->timer_watch); | |
602 | ||
603 | return r; | |
07b0b134 ML |
604 | } |
605 | ||
e1770af8 | 606 | static void swap_enter_dead(Swap *s, SwapResult f) { |
07b0b134 ML |
607 | assert(s); |
608 | ||
e1770af8 LP |
609 | if (f != SWAP_SUCCESS) |
610 | s->result = f; | |
e04aad61 | 611 | |
e1770af8 | 612 | swap_set_state(s, s->result != SWAP_SUCCESS ? SWAP_FAILED : SWAP_DEAD); |
07b0b134 ML |
613 | } |
614 | ||
e1770af8 | 615 | static void swap_enter_active(Swap *s, SwapResult f) { |
e04aad61 LP |
616 | assert(s); |
617 | ||
e1770af8 LP |
618 | if (f != SWAP_SUCCESS) |
619 | s->result = f; | |
e04aad61 LP |
620 | |
621 | swap_set_state(s, SWAP_ACTIVE); | |
622 | } | |
623 | ||
e1770af8 | 624 | static void swap_enter_signal(Swap *s, SwapState state, SwapResult f) { |
07b0b134 | 625 | int r; |
e04aad61 LP |
626 | Set *pid_set = NULL; |
627 | bool wait_for_exit = false; | |
07b0b134 ML |
628 | |
629 | assert(s); | |
e04aad61 | 630 | |
e1770af8 LP |
631 | if (f != SWAP_SUCCESS) |
632 | s->result = f; | |
e04aad61 LP |
633 | |
634 | if (s->exec_context.kill_mode != KILL_NONE) { | |
635 | int sig = (state == SWAP_ACTIVATING_SIGTERM || | |
636 | state == SWAP_DEACTIVATING_SIGTERM) ? s->exec_context.kill_signal : SIGKILL; | |
637 | ||
638 | if (s->control_pid > 0) { | |
cd25cce9 | 639 | if (kill_and_sigcont(s->control_pid, sig) < 0 && errno != ESRCH) |
e04aad61 LP |
640 | |
641 | log_warning("Failed to kill control process %li: %m", (long) s->control_pid); | |
642 | else | |
643 | wait_for_exit = true; | |
644 | } | |
645 | ||
646 | if (s->exec_context.kill_mode == KILL_CONTROL_GROUP) { | |
647 | ||
648 | if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func))) { | |
649 | r = -ENOMEM; | |
650 | goto fail; | |
651 | } | |
652 | ||
653 | /* Exclude the control pid from being killed via the cgroup */ | |
654 | if (s->control_pid > 0) | |
655 | if ((r = set_put(pid_set, LONG_TO_PTR(s->control_pid))) < 0) | |
656 | goto fail; | |
657 | ||
88f3e0c9 | 658 | r = cgroup_bonding_kill_list(UNIT(s)->cgroup_bondings, sig, true, false, pid_set, NULL); |
ecedd90f | 659 | if (r < 0) { |
e04aad61 LP |
660 | if (r != -EAGAIN && r != -ESRCH && r != -ENOENT) |
661 | log_warning("Failed to kill control group: %s", strerror(-r)); | |
662 | } else if (r > 0) | |
663 | wait_for_exit = true; | |
664 | ||
665 | set_free(pid_set); | |
da19d5c1 | 666 | pid_set = NULL; |
e04aad61 LP |
667 | } |
668 | } | |
669 | ||
670 | if (wait_for_exit) { | |
671 | if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0) | |
672 | goto fail; | |
673 | ||
674 | swap_set_state(s, state); | |
675 | } else | |
e1770af8 | 676 | swap_enter_dead(s, SWAP_SUCCESS); |
e04aad61 LP |
677 | |
678 | return; | |
679 | ||
680 | fail: | |
1124fe6f | 681 | log_warning("%s failed to kill processes: %s", UNIT(s)->id, strerror(-r)); |
e04aad61 | 682 | |
e1770af8 | 683 | swap_enter_dead(s, SWAP_FAILURE_RESOURCES); |
e04aad61 LP |
684 | |
685 | if (pid_set) | |
686 | set_free(pid_set); | |
687 | } | |
688 | ||
689 | static void swap_enter_activating(Swap *s) { | |
690 | int r, priority; | |
691 | ||
692 | assert(s); | |
693 | ||
694 | s->control_command_id = SWAP_EXEC_ACTIVATE; | |
695 | s->control_command = s->exec_command + SWAP_EXEC_ACTIVATE; | |
07b0b134 | 696 | |
4e85aff4 LP |
697 | if (s->from_fragment) |
698 | priority = s->parameters_fragment.priority; | |
e04aad61 LP |
699 | else |
700 | priority = -1; | |
4e85aff4 | 701 | |
e04aad61 LP |
702 | if (priority >= 0) { |
703 | char p[LINE_MAX]; | |
07b0b134 | 704 | |
e04aad61 LP |
705 | snprintf(p, sizeof(p), "%i", priority); |
706 | char_array_0(p); | |
07b0b134 | 707 | |
e04aad61 LP |
708 | r = exec_command_set( |
709 | s->control_command, | |
710 | "/sbin/swapon", | |
711 | "-p", | |
712 | p, | |
713 | s->what, | |
714 | NULL); | |
715 | } else | |
716 | r = exec_command_set( | |
717 | s->control_command, | |
718 | "/sbin/swapon", | |
719 | s->what, | |
720 | NULL); | |
721 | ||
722 | if (r < 0) | |
723 | goto fail; | |
724 | ||
725 | swap_unwatch_control_pid(s); | |
726 | ||
727 | if ((r = swap_spawn(s, s->control_command, &s->control_pid)) < 0) | |
728 | goto fail; | |
729 | ||
730 | swap_set_state(s, SWAP_ACTIVATING); | |
731 | ||
732 | return; | |
733 | ||
734 | fail: | |
1124fe6f | 735 | log_warning("%s failed to run 'swapon' task: %s", UNIT(s)->id, strerror(-r)); |
e1770af8 | 736 | swap_enter_dead(s, SWAP_FAILURE_RESOURCES); |
e04aad61 LP |
737 | } |
738 | ||
e1770af8 | 739 | static void swap_enter_deactivating(Swap *s) { |
e04aad61 LP |
740 | int r; |
741 | ||
742 | assert(s); | |
743 | ||
e04aad61 LP |
744 | s->control_command_id = SWAP_EXEC_DEACTIVATE; |
745 | s->control_command = s->exec_command + SWAP_EXEC_DEACTIVATE; | |
746 | ||
747 | if ((r = exec_command_set( | |
748 | s->control_command, | |
749 | "/sbin/swapoff", | |
750 | s->what, | |
751 | NULL)) < 0) | |
752 | goto fail; | |
753 | ||
754 | swap_unwatch_control_pid(s); | |
755 | ||
756 | if ((r = swap_spawn(s, s->control_command, &s->control_pid)) < 0) | |
757 | goto fail; | |
758 | ||
759 | swap_set_state(s, SWAP_DEACTIVATING); | |
760 | ||
761 | return; | |
762 | ||
763 | fail: | |
1124fe6f | 764 | log_warning("%s failed to run 'swapoff' task: %s", UNIT(s)->id, strerror(-r)); |
e1770af8 | 765 | swap_enter_active(s, SWAP_FAILURE_RESOURCES); |
e04aad61 LP |
766 | } |
767 | ||
768 | static int swap_start(Unit *u) { | |
769 | Swap *s = SWAP(u); | |
770 | ||
771 | assert(s); | |
772 | ||
773 | /* We cannot fulfill this request right now, try again later | |
774 | * please! */ | |
775 | ||
776 | if (s->state == SWAP_DEACTIVATING || | |
777 | s->state == SWAP_DEACTIVATING_SIGTERM || | |
778 | s->state == SWAP_DEACTIVATING_SIGKILL || | |
779 | s->state == SWAP_ACTIVATING_SIGTERM || | |
780 | s->state == SWAP_ACTIVATING_SIGKILL) | |
781 | return -EAGAIN; | |
782 | ||
783 | if (s->state == SWAP_ACTIVATING) | |
784 | return 0; | |
785 | ||
786 | assert(s->state == SWAP_DEAD || s->state == SWAP_FAILED); | |
787 | ||
e1770af8 | 788 | s->result = SWAP_SUCCESS; |
e04aad61 | 789 | swap_enter_activating(s); |
07b0b134 ML |
790 | return 0; |
791 | } | |
792 | ||
793 | static int swap_stop(Unit *u) { | |
794 | Swap *s = SWAP(u); | |
07b0b134 ML |
795 | |
796 | assert(s); | |
797 | ||
e04aad61 LP |
798 | if (s->state == SWAP_DEACTIVATING || |
799 | s->state == SWAP_DEACTIVATING_SIGTERM || | |
800 | s->state == SWAP_DEACTIVATING_SIGKILL || | |
801 | s->state == SWAP_ACTIVATING_SIGTERM || | |
802 | s->state == SWAP_ACTIVATING_SIGKILL) | |
803 | return 0; | |
07b0b134 | 804 | |
e04aad61 LP |
805 | assert(s->state == SWAP_ACTIVATING || |
806 | s->state == SWAP_ACTIVE); | |
07b0b134 | 807 | |
e1770af8 | 808 | swap_enter_deactivating(s); |
07b0b134 ML |
809 | return 0; |
810 | } | |
811 | ||
812 | static int swap_serialize(Unit *u, FILE *f, FDSet *fds) { | |
813 | Swap *s = SWAP(u); | |
814 | ||
815 | assert(s); | |
816 | assert(f); | |
817 | assert(fds); | |
818 | ||
819 | unit_serialize_item(u, f, "state", swap_state_to_string(s->state)); | |
e1770af8 | 820 | unit_serialize_item(u, f, "result", swap_result_to_string(s->result)); |
e04aad61 LP |
821 | |
822 | if (s->control_pid > 0) | |
823 | unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) s->control_pid); | |
824 | ||
825 | if (s->control_command_id >= 0) | |
826 | unit_serialize_item(u, f, "control-command", swap_exec_command_to_string(s->control_command_id)); | |
07b0b134 ML |
827 | |
828 | return 0; | |
829 | } | |
830 | ||
831 | static int swap_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
832 | Swap *s = SWAP(u); | |
833 | ||
834 | assert(s); | |
835 | assert(fds); | |
836 | ||
837 | if (streq(key, "state")) { | |
838 | SwapState state; | |
839 | ||
840 | if ((state = swap_state_from_string(value)) < 0) | |
841 | log_debug("Failed to parse state value %s", value); | |
842 | else | |
843 | s->deserialized_state = state; | |
e1770af8 LP |
844 | } else if (streq(key, "result")) { |
845 | SwapResult f; | |
846 | ||
847 | f = swap_result_from_string(value); | |
848 | if (f < 0) | |
849 | log_debug("Failed to parse result value %s", value); | |
850 | else if (f != SWAP_SUCCESS) | |
851 | s->result = f; | |
e04aad61 LP |
852 | } else if (streq(key, "control-pid")) { |
853 | pid_t pid; | |
854 | ||
855 | if (parse_pid(value, &pid) < 0) | |
856 | log_debug("Failed to parse control-pid value %s", value); | |
857 | else | |
858 | s->control_pid = pid; | |
859 | ||
860 | } else if (streq(key, "control-command")) { | |
861 | SwapExecCommand id; | |
862 | ||
863 | if ((id = swap_exec_command_from_string(value)) < 0) | |
864 | log_debug("Failed to parse exec-command value %s", value); | |
865 | else { | |
866 | s->control_command_id = id; | |
867 | s->control_command = s->exec_command + id; | |
868 | } | |
869 | ||
07b0b134 ML |
870 | } else |
871 | log_debug("Unknown serialization key '%s'", key); | |
872 | ||
873 | return 0; | |
874 | } | |
875 | ||
876 | static UnitActiveState swap_active_state(Unit *u) { | |
877 | assert(u); | |
878 | ||
879 | return state_translation_table[SWAP(u)->state]; | |
880 | } | |
881 | ||
882 | static const char *swap_sub_state_to_string(Unit *u) { | |
883 | assert(u); | |
884 | ||
885 | return swap_state_to_string(SWAP(u)->state); | |
886 | } | |
887 | ||
888 | static bool swap_check_gc(Unit *u) { | |
889 | Swap *s = SWAP(u); | |
890 | ||
891 | assert(s); | |
892 | ||
6b1dc2bd | 893 | return s->from_proc_swaps; |
07b0b134 ML |
894 | } |
895 | ||
e04aad61 LP |
896 | static void swap_sigchld_event(Unit *u, pid_t pid, int code, int status) { |
897 | Swap *s = SWAP(u); | |
e1770af8 | 898 | SwapResult f; |
e04aad61 LP |
899 | |
900 | assert(s); | |
901 | assert(pid >= 0); | |
902 | ||
903 | if (pid != s->control_pid) | |
904 | return; | |
905 | ||
906 | s->control_pid = 0; | |
907 | ||
e1770af8 LP |
908 | if (is_clean_exit(code, status)) |
909 | f = SWAP_SUCCESS; | |
910 | else if (code == CLD_EXITED) | |
911 | f = SWAP_FAILURE_EXIT_CODE; | |
912 | else if (code == CLD_KILLED) | |
913 | f = SWAP_FAILURE_SIGNAL; | |
914 | else if (code == CLD_DUMPED) | |
915 | f = SWAP_FAILURE_CORE_DUMP; | |
916 | else | |
917 | assert_not_reached("Unknown code"); | |
918 | ||
919 | if (f != SWAP_SUCCESS) | |
920 | s->result = f; | |
e04aad61 LP |
921 | |
922 | if (s->control_command) { | |
6ea832a2 | 923 | exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status); |
e1770af8 | 924 | |
e04aad61 LP |
925 | s->control_command = NULL; |
926 | s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; | |
927 | } | |
928 | ||
e1770af8 | 929 | log_full(f == SWAP_SUCCESS ? LOG_DEBUG : LOG_NOTICE, |
ac155bb8 | 930 | "%s swap process exited, code=%s status=%i", u->id, sigchld_code_to_string(code), status); |
e04aad61 LP |
931 | |
932 | switch (s->state) { | |
933 | ||
934 | case SWAP_ACTIVATING: | |
935 | case SWAP_ACTIVATING_SIGTERM: | |
936 | case SWAP_ACTIVATING_SIGKILL: | |
937 | ||
e1770af8 LP |
938 | if (f == SWAP_SUCCESS) |
939 | swap_enter_active(s, f); | |
e04aad61 | 940 | else |
e1770af8 | 941 | swap_enter_dead(s, f); |
e04aad61 LP |
942 | break; |
943 | ||
944 | case SWAP_DEACTIVATING: | |
945 | case SWAP_DEACTIVATING_SIGKILL: | |
946 | case SWAP_DEACTIVATING_SIGTERM: | |
947 | ||
e1770af8 LP |
948 | if (f == SWAP_SUCCESS) |
949 | swap_enter_dead(s, f); | |
e04aad61 | 950 | else |
e1770af8 | 951 | swap_enter_dead(s, f); |
e04aad61 LP |
952 | break; |
953 | ||
954 | default: | |
955 | assert_not_reached("Uh, control process died at wrong time."); | |
956 | } | |
957 | ||
958 | /* Notify clients about changed exit status */ | |
959 | unit_add_to_dbus_queue(u); | |
960 | ||
961 | /* Request a reload of /proc/swaps, so that following units | |
962 | * can follow our state change */ | |
ac155bb8 | 963 | u->manager->request_reload = true; |
e04aad61 LP |
964 | } |
965 | ||
966 | static void swap_timer_event(Unit *u, uint64_t elapsed, Watch *w) { | |
967 | Swap *s = SWAP(u); | |
968 | ||
969 | assert(s); | |
970 | assert(elapsed == 1); | |
971 | assert(w == &s->timer_watch); | |
972 | ||
973 | switch (s->state) { | |
974 | ||
975 | case SWAP_ACTIVATING: | |
ac155bb8 | 976 | log_warning("%s activation timed out. Stopping.", u->id); |
e1770af8 | 977 | swap_enter_signal(s, SWAP_ACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT); |
e04aad61 LP |
978 | break; |
979 | ||
980 | case SWAP_DEACTIVATING: | |
ac155bb8 | 981 | log_warning("%s deactivation timed out. Stopping.", u->id); |
e1770af8 | 982 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT); |
e04aad61 LP |
983 | break; |
984 | ||
985 | case SWAP_ACTIVATING_SIGTERM: | |
ba035df2 | 986 | if (s->exec_context.send_sigkill) { |
ac155bb8 | 987 | log_warning("%s activation timed out. Killing.", u->id); |
e1770af8 | 988 | swap_enter_signal(s, SWAP_ACTIVATING_SIGKILL, SWAP_FAILURE_TIMEOUT); |
ba035df2 | 989 | } else { |
ac155bb8 | 990 | log_warning("%s activation timed out. Skipping SIGKILL. Ignoring.", u->id); |
e1770af8 | 991 | swap_enter_dead(s, SWAP_FAILURE_TIMEOUT); |
ba035df2 | 992 | } |
e04aad61 LP |
993 | break; |
994 | ||
995 | case SWAP_DEACTIVATING_SIGTERM: | |
ba035df2 | 996 | if (s->exec_context.send_sigkill) { |
ac155bb8 | 997 | log_warning("%s deactivation timed out. Killing.", u->id); |
e1770af8 | 998 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, SWAP_FAILURE_TIMEOUT); |
ba035df2 | 999 | } else { |
ac155bb8 | 1000 | log_warning("%s deactivation timed out. Skipping SIGKILL. Ignoring.", u->id); |
e1770af8 | 1001 | swap_enter_dead(s, SWAP_FAILURE_TIMEOUT); |
ba035df2 | 1002 | } |
e04aad61 LP |
1003 | break; |
1004 | ||
1005 | case SWAP_ACTIVATING_SIGKILL: | |
1006 | case SWAP_DEACTIVATING_SIGKILL: | |
ac155bb8 | 1007 | log_warning("%s swap process still around after SIGKILL. Ignoring.", u->id); |
e1770af8 | 1008 | swap_enter_dead(s, SWAP_FAILURE_TIMEOUT); |
e04aad61 LP |
1009 | break; |
1010 | ||
1011 | default: | |
1012 | assert_not_reached("Timeout at wrong time."); | |
1013 | } | |
1014 | } | |
1015 | ||
1016 | static int swap_load_proc_swaps(Manager *m, bool set_flags) { | |
1017 | unsigned i; | |
1018 | int r = 0; | |
1019 | ||
1020 | assert(m); | |
1021 | ||
07b0b134 | 1022 | rewind(m->proc_swaps); |
bab45044 | 1023 | |
4e85aff4 | 1024 | (void) fscanf(m->proc_swaps, "%*s %*s %*s %*s %*s\n"); |
07b0b134 | 1025 | |
e04aad61 | 1026 | for (i = 1;; i++) { |
07b0b134 ML |
1027 | char *dev = NULL, *d; |
1028 | int prio = 0, k; | |
1029 | ||
4e85aff4 | 1030 | if ((k = fscanf(m->proc_swaps, |
e04aad61 LP |
1031 | "%ms " /* device/file */ |
1032 | "%*s " /* type of swap */ | |
1033 | "%*s " /* swap size */ | |
1034 | "%*s " /* used */ | |
4e85aff4 LP |
1035 | "%i\n", /* priority */ |
1036 | &dev, &prio)) != 2) { | |
07b0b134 | 1037 | |
07b0b134 | 1038 | if (k == EOF) |
4e85aff4 | 1039 | break; |
07b0b134 | 1040 | |
e04aad61 | 1041 | log_warning("Failed to parse /proc/swaps:%u.", i); |
07b0b134 | 1042 | free(dev); |
e04aad61 | 1043 | continue; |
07b0b134 | 1044 | } |
07b0b134 | 1045 | |
4e85aff4 | 1046 | d = cunescape(dev); |
07b0b134 | 1047 | free(dev); |
4e85aff4 LP |
1048 | |
1049 | if (!d) | |
1050 | return -ENOMEM; | |
1051 | ||
e04aad61 | 1052 | k = swap_process_new_swap(m, d, prio, set_flags); |
07b0b134 ML |
1053 | free(d); |
1054 | ||
1055 | if (k < 0) | |
e04aad61 | 1056 | r = k; |
07b0b134 ML |
1057 | } |
1058 | ||
e04aad61 LP |
1059 | return r; |
1060 | } | |
1061 | ||
1062 | int swap_dispatch_reload(Manager *m) { | |
4e434314 | 1063 | /* This function should go as soon as the kernel properly notifies us */ |
e04aad61 LP |
1064 | |
1065 | if (_likely_(!m->request_reload)) | |
1066 | return 0; | |
1067 | ||
1068 | m->request_reload = false; | |
1069 | ||
4e434314 LP |
1070 | return swap_fd_event(m, EPOLLPRI); |
1071 | } | |
1072 | ||
1073 | int swap_fd_event(Manager *m, int events) { | |
595ed347 | 1074 | Unit *u; |
4e434314 LP |
1075 | int r; |
1076 | ||
1077 | assert(m); | |
1078 | assert(events & EPOLLPRI); | |
1079 | ||
bd40a2d8 | 1080 | if ((r = swap_load_proc_swaps(m, true)) < 0) { |
e04aad61 LP |
1081 | log_error("Failed to reread /proc/swaps: %s", strerror(-r)); |
1082 | ||
1083 | /* Reset flags, just in case, for late calls */ | |
595ed347 MS |
1084 | LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) { |
1085 | Swap *swap = SWAP(u); | |
e04aad61 LP |
1086 | |
1087 | swap->is_active = swap->just_activated = false; | |
1088 | } | |
1089 | ||
1090 | return 0; | |
1091 | } | |
1092 | ||
1093 | manager_dispatch_load_queue(m); | |
1094 | ||
595ed347 MS |
1095 | LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) { |
1096 | Swap *swap = SWAP(u); | |
e04aad61 LP |
1097 | |
1098 | if (!swap->is_active) { | |
1099 | /* This has just been deactivated */ | |
1100 | ||
1101 | swap->from_proc_swaps = false; | |
1102 | swap_unset_proc_swaps(swap); | |
1103 | ||
1104 | switch (swap->state) { | |
1105 | ||
1106 | case SWAP_ACTIVE: | |
e1770af8 | 1107 | swap_enter_dead(swap, SWAP_SUCCESS); |
e04aad61 LP |
1108 | break; |
1109 | ||
1110 | default: | |
1111 | swap_set_state(swap, swap->state); | |
1112 | break; | |
1113 | } | |
1114 | ||
1115 | } else if (swap->just_activated) { | |
1116 | ||
1117 | /* New swap entry */ | |
1118 | ||
1119 | switch (swap->state) { | |
1120 | ||
1121 | case SWAP_DEAD: | |
1122 | case SWAP_FAILED: | |
e1770af8 | 1123 | swap_enter_active(swap, SWAP_SUCCESS); |
e04aad61 LP |
1124 | break; |
1125 | ||
1126 | default: | |
1127 | /* Nothing really changed, but let's | |
1128 | * issue an notification call | |
1129 | * nonetheless, in case somebody is | |
1130 | * waiting for this. */ | |
1131 | swap_set_state(swap, swap->state); | |
1132 | break; | |
1133 | } | |
1134 | } | |
1135 | ||
1136 | /* Reset the flags for later calls */ | |
1137 | swap->is_active = swap->just_activated = false; | |
1138 | } | |
1139 | ||
1140 | return 1; | |
1141 | } | |
1142 | ||
1143 | static Unit *swap_following(Unit *u) { | |
1144 | Swap *s = SWAP(u); | |
1145 | Swap *other, *first = NULL; | |
1146 | ||
1147 | assert(s); | |
1148 | ||
1149 | if (streq_ptr(s->what, s->parameters_proc_swaps.what)) | |
1150 | return NULL; | |
1151 | ||
1152 | /* Make everybody follow the unit that's named after the swap | |
1153 | * device in the kernel */ | |
1154 | ||
1155 | LIST_FOREACH_AFTER(same_proc_swaps, other, s) | |
1156 | if (streq_ptr(other->what, other->parameters_proc_swaps.what)) | |
1157 | return UNIT(other); | |
1158 | ||
1159 | LIST_FOREACH_BEFORE(same_proc_swaps, other, s) { | |
1160 | if (streq_ptr(other->what, other->parameters_proc_swaps.what)) | |
1161 | return UNIT(other); | |
1162 | ||
1163 | first = other; | |
1164 | } | |
1165 | ||
1166 | return UNIT(first); | |
07b0b134 ML |
1167 | } |
1168 | ||
6210e7fc LP |
1169 | static int swap_following_set(Unit *u, Set **_set) { |
1170 | Swap *s = SWAP(u); | |
1171 | Swap *other; | |
1172 | Set *set; | |
1173 | int r; | |
1174 | ||
1175 | assert(s); | |
1176 | assert(_set); | |
1177 | ||
1178 | if (LIST_JUST_US(same_proc_swaps, s)) { | |
1179 | *_set = NULL; | |
1180 | return 0; | |
1181 | } | |
1182 | ||
1183 | if (!(set = set_new(NULL, NULL))) | |
1184 | return -ENOMEM; | |
1185 | ||
1186 | LIST_FOREACH_AFTER(same_proc_swaps, other, s) | |
1187 | if ((r = set_put(set, other)) < 0) | |
1188 | goto fail; | |
1189 | ||
1190 | LIST_FOREACH_BEFORE(same_proc_swaps, other, s) | |
1191 | if ((r = set_put(set, other)) < 0) | |
1192 | goto fail; | |
1193 | ||
1194 | *_set = set; | |
1195 | return 1; | |
1196 | ||
1197 | fail: | |
1198 | set_free(set); | |
1199 | return r; | |
1200 | } | |
1201 | ||
07b0b134 ML |
1202 | static void swap_shutdown(Manager *m) { |
1203 | assert(m); | |
1204 | ||
1205 | if (m->proc_swaps) { | |
1206 | fclose(m->proc_swaps); | |
1207 | m->proc_swaps = NULL; | |
1208 | } | |
e04aad61 LP |
1209 | |
1210 | hashmap_free(m->swaps_by_proc_swaps); | |
1211 | m->swaps_by_proc_swaps = NULL; | |
07b0b134 ML |
1212 | } |
1213 | ||
07b0b134 ML |
1214 | static int swap_enumerate(Manager *m) { |
1215 | int r; | |
4e434314 | 1216 | struct epoll_event ev; |
07b0b134 ML |
1217 | assert(m); |
1218 | ||
4e434314 | 1219 | if (!m->proc_swaps) { |
4e85aff4 | 1220 | if (!(m->proc_swaps = fopen("/proc/swaps", "re"))) |
3f858732 | 1221 | return (errno == ENOENT) ? 0 : -errno; |
07b0b134 | 1222 | |
4e434314 LP |
1223 | m->swap_watch.type = WATCH_SWAP; |
1224 | m->swap_watch.fd = fileno(m->proc_swaps); | |
1225 | ||
1226 | zero(ev); | |
1227 | ev.events = EPOLLPRI; | |
1228 | ev.data.ptr = &m->swap_watch; | |
1229 | ||
1230 | if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->swap_watch.fd, &ev) < 0) | |
1231 | return -errno; | |
1232 | } | |
1233 | ||
e04aad61 | 1234 | if ((r = swap_load_proc_swaps(m, false)) < 0) |
07b0b134 ML |
1235 | swap_shutdown(m); |
1236 | ||
1237 | return r; | |
1238 | } | |
1239 | ||
fdf20a31 | 1240 | static void swap_reset_failed(Unit *u) { |
5632e374 LP |
1241 | Swap *s = SWAP(u); |
1242 | ||
1243 | assert(s); | |
1244 | ||
fdf20a31 | 1245 | if (s->state == SWAP_FAILED) |
5632e374 | 1246 | swap_set_state(s, SWAP_DEAD); |
e04aad61 | 1247 | |
e1770af8 | 1248 | s->result = SWAP_SUCCESS; |
5632e374 LP |
1249 | } |
1250 | ||
8a0867d6 LP |
1251 | static int swap_kill(Unit *u, KillWho who, KillMode mode, int signo, DBusError *error) { |
1252 | Swap *s = SWAP(u); | |
1253 | int r = 0; | |
1254 | Set *pid_set = NULL; | |
1255 | ||
1256 | assert(s); | |
1257 | ||
1258 | if (who == KILL_MAIN) { | |
1259 | dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "Swap units have no main processes"); | |
a17204af | 1260 | return -ESRCH; |
8a0867d6 LP |
1261 | } |
1262 | ||
1263 | if (s->control_pid <= 0 && who == KILL_CONTROL) { | |
1264 | dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "No control process to kill"); | |
a17204af | 1265 | return -ESRCH; |
8a0867d6 LP |
1266 | } |
1267 | ||
3611581e LP |
1268 | if (who == KILL_CONTROL || who == KILL_ALL) |
1269 | if (s->control_pid > 0) | |
1270 | if (kill(s->control_pid, signo) < 0) | |
1271 | r = -errno; | |
8a0867d6 | 1272 | |
3611581e | 1273 | if (who == KILL_ALL && mode == KILL_CONTROL_GROUP) { |
8a0867d6 LP |
1274 | int q; |
1275 | ||
1276 | if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func))) | |
1277 | return -ENOMEM; | |
1278 | ||
1279 | /* Exclude the control pid from being killed via the cgroup */ | |
1280 | if (s->control_pid > 0) | |
1281 | if ((q = set_put(pid_set, LONG_TO_PTR(s->control_pid))) < 0) { | |
1282 | r = q; | |
1283 | goto finish; | |
1284 | } | |
1285 | ||
88f3e0c9 | 1286 | q = cgroup_bonding_kill_list(UNIT(s)->cgroup_bondings, signo, false, false, pid_set, NULL); |
ecedd90f | 1287 | if (q < 0) |
3611581e | 1288 | if (q != -EAGAIN && q != -ESRCH && q != -ENOENT) |
8a0867d6 LP |
1289 | r = q; |
1290 | } | |
1291 | ||
1292 | finish: | |
1293 | if (pid_set) | |
1294 | set_free(pid_set); | |
1295 | ||
1296 | return r; | |
1297 | } | |
1298 | ||
5632e374 LP |
1299 | static const char* const swap_state_table[_SWAP_STATE_MAX] = { |
1300 | [SWAP_DEAD] = "dead", | |
e04aad61 | 1301 | [SWAP_ACTIVATING] = "activating", |
5632e374 | 1302 | [SWAP_ACTIVE] = "active", |
e04aad61 LP |
1303 | [SWAP_DEACTIVATING] = "deactivating", |
1304 | [SWAP_ACTIVATING_SIGTERM] = "activating-sigterm", | |
1305 | [SWAP_ACTIVATING_SIGKILL] = "activating-sigkill", | |
1306 | [SWAP_DEACTIVATING_SIGTERM] = "deactivating-sigterm", | |
1307 | [SWAP_DEACTIVATING_SIGKILL] = "deactivating-sigkill", | |
fdf20a31 | 1308 | [SWAP_FAILED] = "failed" |
5632e374 LP |
1309 | }; |
1310 | ||
1311 | DEFINE_STRING_TABLE_LOOKUP(swap_state, SwapState); | |
1312 | ||
e04aad61 LP |
1313 | static const char* const swap_exec_command_table[_SWAP_EXEC_COMMAND_MAX] = { |
1314 | [SWAP_EXEC_ACTIVATE] = "ExecActivate", | |
1315 | [SWAP_EXEC_DEACTIVATE] = "ExecDeactivate", | |
1316 | }; | |
1317 | ||
1318 | DEFINE_STRING_TABLE_LOOKUP(swap_exec_command, SwapExecCommand); | |
1319 | ||
e1770af8 LP |
1320 | static const char* const swap_result_table[_SWAP_RESULT_MAX] = { |
1321 | [SWAP_SUCCESS] = "success", | |
1322 | [SWAP_FAILURE_RESOURCES] = "resources", | |
1323 | [SWAP_FAILURE_TIMEOUT] = "timeout", | |
1324 | [SWAP_FAILURE_EXIT_CODE] = "exit-code", | |
1325 | [SWAP_FAILURE_SIGNAL] = "signal", | |
1326 | [SWAP_FAILURE_CORE_DUMP] = "core-dump" | |
1327 | }; | |
1328 | ||
1329 | DEFINE_STRING_TABLE_LOOKUP(swap_result, SwapResult); | |
1330 | ||
07b0b134 ML |
1331 | const UnitVTable swap_vtable = { |
1332 | .suffix = ".swap", | |
7d17cfbc | 1333 | .object_size = sizeof(Swap), |
f975e971 LP |
1334 | .sections = |
1335 | "Unit\0" | |
1336 | "Swap\0" | |
1337 | "Install\0", | |
07b0b134 | 1338 | |
e04aad61 | 1339 | .no_alias = true, |
07b0b134 ML |
1340 | .no_instances = true, |
1341 | ||
4e85aff4 | 1342 | .init = swap_init, |
07b0b134 | 1343 | .load = swap_load, |
6e620bec | 1344 | .done = swap_done, |
07b0b134 ML |
1345 | |
1346 | .coldplug = swap_coldplug, | |
1347 | ||
1348 | .dump = swap_dump, | |
1349 | ||
1350 | .start = swap_start, | |
1351 | .stop = swap_stop, | |
1352 | ||
8a0867d6 LP |
1353 | .kill = swap_kill, |
1354 | ||
07b0b134 ML |
1355 | .serialize = swap_serialize, |
1356 | .deserialize_item = swap_deserialize_item, | |
1357 | ||
1358 | .active_state = swap_active_state, | |
1359 | .sub_state_to_string = swap_sub_state_to_string, | |
1360 | ||
1361 | .check_gc = swap_check_gc, | |
1362 | ||
e04aad61 LP |
1363 | .sigchld_event = swap_sigchld_event, |
1364 | .timer_event = swap_timer_event, | |
1365 | ||
1366 | .reset_failed = swap_reset_failed, | |
1367 | ||
c4e2ceae | 1368 | .bus_interface = "org.freedesktop.systemd1.Swap", |
07b0b134 | 1369 | .bus_message_handler = bus_swap_message_handler, |
c4e2ceae | 1370 | .bus_invalidating_properties = bus_swap_invalidating_properties, |
07b0b134 | 1371 | |
e04aad61 | 1372 | .following = swap_following, |
6210e7fc | 1373 | .following_set = swap_following_set, |
5632e374 | 1374 | |
6e620bec | 1375 | .enumerate = swap_enumerate, |
c6918296 MS |
1376 | .shutdown = swap_shutdown, |
1377 | ||
1378 | .status_message_formats = { | |
1379 | .starting_stopping = { | |
1380 | [0] = "Activating swap %s...", | |
1381 | [1] = "Deactivating swap %s...", | |
1382 | }, | |
1383 | .finished_start_job = { | |
1384 | [JOB_DONE] = "Activated swap %s.", | |
1385 | [JOB_FAILED] = "Failed to activate swap %s.", | |
1386 | [JOB_DEPENDENCY] = "Dependency failed for %s.", | |
1387 | [JOB_TIMEOUT] = "Timed out activating swap %s.", | |
1388 | }, | |
1389 | .finished_stop_job = { | |
1390 | [JOB_DONE] = "Deactivated swap %s.", | |
1391 | [JOB_FAILED] = "Failed deactivating swap %s.", | |
1392 | [JOB_TIMEOUT] = "Timed out deactivating swap %s.", | |
1393 | }, | |
1394 | }, | |
07b0b134 | 1395 | }; |