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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" |
a5c3034f | 42 | #include "virt.h" |
07b0b134 ML |
43 | |
44 | static const UnitActiveState state_translation_table[_SWAP_STATE_MAX] = { | |
45 | [SWAP_DEAD] = UNIT_INACTIVE, | |
e04aad61 | 46 | [SWAP_ACTIVATING] = UNIT_ACTIVATING, |
07b0b134 | 47 | [SWAP_ACTIVE] = UNIT_ACTIVE, |
e04aad61 LP |
48 | [SWAP_DEACTIVATING] = UNIT_DEACTIVATING, |
49 | [SWAP_ACTIVATING_SIGTERM] = UNIT_DEACTIVATING, | |
50 | [SWAP_ACTIVATING_SIGKILL] = UNIT_DEACTIVATING, | |
51 | [SWAP_DEACTIVATING_SIGTERM] = UNIT_DEACTIVATING, | |
52 | [SWAP_DEACTIVATING_SIGKILL] = UNIT_DEACTIVATING, | |
fdf20a31 | 53 | [SWAP_FAILED] = UNIT_FAILED |
07b0b134 ML |
54 | }; |
55 | ||
e04aad61 LP |
56 | static void swap_unset_proc_swaps(Swap *s) { |
57 | Swap *first; | |
58 | ||
59 | assert(s); | |
60 | ||
61 | if (!s->parameters_proc_swaps.what) | |
62 | return; | |
63 | ||
64 | /* Remove this unit from the chain of swaps which share the | |
65 | * same kernel swap device. */ | |
66 | ||
1124fe6f | 67 | first = hashmap_get(UNIT(s)->manager->swaps_by_proc_swaps, s->parameters_proc_swaps.what); |
e04aad61 LP |
68 | LIST_REMOVE(Swap, same_proc_swaps, first, s); |
69 | ||
70 | if (first) | |
1124fe6f | 71 | hashmap_remove_and_replace(UNIT(s)->manager->swaps_by_proc_swaps, s->parameters_proc_swaps.what, first->parameters_proc_swaps.what, first); |
e04aad61 | 72 | else |
1124fe6f | 73 | hashmap_remove(UNIT(s)->manager->swaps_by_proc_swaps, s->parameters_proc_swaps.what); |
e04aad61 LP |
74 | |
75 | free(s->parameters_proc_swaps.what); | |
76 | s->parameters_proc_swaps.what = NULL; | |
77 | } | |
78 | ||
f6cebb3b | 79 | static void swap_init(Unit *u) { |
6e620bec LP |
80 | Swap *s = SWAP(u); |
81 | ||
82 | assert(s); | |
1124fe6f | 83 | assert(UNIT(s)->load_state == UNIT_STUB); |
6e620bec | 84 | |
e04aad61 LP |
85 | s->timeout_usec = DEFAULT_TIMEOUT_USEC; |
86 | ||
87 | exec_context_init(&s->exec_context); | |
ac155bb8 MS |
88 | s->exec_context.std_output = u->manager->default_std_output; |
89 | s->exec_context.std_error = u->manager->default_std_error; | |
4819ff03 | 90 | kill_context_init(&s->kill_context); |
e04aad61 | 91 | |
6b1dc2bd | 92 | s->parameters_proc_swaps.priority = s->parameters_fragment.priority = -1; |
e04aad61 LP |
93 | |
94 | s->timer_watch.type = WATCH_INVALID; | |
95 | ||
e1770af8 | 96 | s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; |
c8f4d764 | 97 | |
1124fe6f | 98 | UNIT(s)->ignore_on_isolate = true; |
e04aad61 LP |
99 | } |
100 | ||
101 | static void swap_unwatch_control_pid(Swap *s) { | |
102 | assert(s); | |
103 | ||
104 | if (s->control_pid <= 0) | |
105 | return; | |
106 | ||
107 | unit_unwatch_pid(UNIT(s), s->control_pid); | |
108 | s->control_pid = 0; | |
6e620bec LP |
109 | } |
110 | ||
4e85aff4 LP |
111 | static void swap_done(Unit *u) { |
112 | Swap *s = SWAP(u); | |
07b0b134 | 113 | |
4e85aff4 | 114 | assert(s); |
07b0b134 | 115 | |
e04aad61 LP |
116 | swap_unset_proc_swaps(s); |
117 | ||
4e85aff4 | 118 | free(s->what); |
e04aad61 LP |
119 | s->what = NULL; |
120 | ||
4e85aff4 | 121 | free(s->parameters_fragment.what); |
6b1dc2bd | 122 | s->parameters_fragment.what = NULL; |
e04aad61 LP |
123 | |
124 | exec_context_done(&s->exec_context); | |
125 | exec_command_done_array(s->exec_command, _SWAP_EXEC_COMMAND_MAX); | |
126 | s->control_command = NULL; | |
127 | ||
128 | swap_unwatch_control_pid(s); | |
129 | ||
130 | unit_unwatch_timer(u, &s->timer_watch); | |
07b0b134 ML |
131 | } |
132 | ||
6e2ef85b LP |
133 | int swap_add_one_mount_link(Swap *s, Mount *m) { |
134 | int r; | |
135 | ||
136 | assert(s); | |
137 | assert(m); | |
138 | ||
1124fe6f MS |
139 | if (UNIT(s)->load_state != UNIT_LOADED || |
140 | UNIT(m)->load_state != UNIT_LOADED) | |
6e2ef85b LP |
141 | return 0; |
142 | ||
8407a5d0 LP |
143 | if (is_device_path(s->what)) |
144 | return 0; | |
145 | ||
6e2ef85b LP |
146 | if (!path_startswith(s->what, m->where)) |
147 | return 0; | |
148 | ||
2c966c03 | 149 | if ((r = unit_add_two_dependencies(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true)) < 0) |
6e2ef85b LP |
150 | return r; |
151 | ||
152 | return 0; | |
153 | } | |
154 | ||
155 | static int swap_add_mount_links(Swap *s) { | |
ac155bb8 | 156 | Unit *other; |
6e2ef85b LP |
157 | int r; |
158 | ||
159 | assert(s); | |
160 | ||
1124fe6f | 161 | LIST_FOREACH(units_by_type, other, UNIT(s)->manager->units_by_type[UNIT_MOUNT]) |
595ed347 | 162 | if ((r = swap_add_one_mount_link(s, MOUNT(other))) < 0) |
6e2ef85b LP |
163 | return r; |
164 | ||
165 | return 0; | |
166 | } | |
167 | ||
07b0b134 | 168 | static int swap_add_target_links(Swap *s) { |
07b0b134 ML |
169 | Unit *tu; |
170 | int r; | |
171 | ||
4e85aff4 LP |
172 | assert(s); |
173 | ||
6b1dc2bd | 174 | if (!s->from_fragment) |
4e85aff4 LP |
175 | return 0; |
176 | ||
1124fe6f | 177 | if ((r = manager_load_unit(UNIT(s)->manager, SPECIAL_SWAP_TARGET, NULL, NULL, &tu)) < 0) |
07b0b134 ML |
178 | return r; |
179 | ||
07b0b134 ML |
180 | return unit_add_dependency(UNIT(s), UNIT_BEFORE, tu, true); |
181 | } | |
182 | ||
173a8d04 LP |
183 | static int swap_add_device_links(Swap *s) { |
184 | SwapParameters *p; | |
185 | ||
186 | assert(s); | |
187 | ||
188 | if (!s->what) | |
189 | return 0; | |
190 | ||
191 | if (s->from_fragment) | |
192 | p = &s->parameters_fragment; | |
173a8d04 LP |
193 | else |
194 | return 0; | |
195 | ||
cfcfd4ae LP |
196 | if (is_device_path(s->what)) |
197 | return unit_add_node_link(UNIT(s), s->what, | |
198 | !p->noauto && p->nofail && | |
1124fe6f | 199 | UNIT(s)->manager->running_as == MANAGER_SYSTEM); |
cfcfd4ae LP |
200 | else |
201 | /* File based swap devices need to be ordered after | |
2b93b027 | 202 | * systemd-remount-fs.service, since they might need a |
cfcfd4ae | 203 | * writable file system. */ |
2b93b027 | 204 | return unit_add_dependency_by_name(UNIT(s), UNIT_AFTER, SPECIAL_REMOUNT_FS_SERVICE, NULL, true); |
173a8d04 LP |
205 | } |
206 | ||
2edd4434 LP |
207 | static int swap_add_default_dependencies(Swap *s) { |
208 | int r; | |
209 | ||
210 | assert(s); | |
211 | ||
6b1dc2bd LP |
212 | if (UNIT(s)->manager->running_as != MANAGER_SYSTEM) |
213 | return 0; | |
2edd4434 | 214 | |
6b1dc2bd LP |
215 | r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true); |
216 | if (r < 0) | |
217 | return r; | |
2edd4434 LP |
218 | |
219 | return 0; | |
220 | } | |
221 | ||
4e85aff4 LP |
222 | static int swap_verify(Swap *s) { |
223 | bool b; | |
224 | char *e; | |
225 | ||
1124fe6f | 226 | if (UNIT(s)->load_state != UNIT_LOADED) |
4e85aff4 LP |
227 | return 0; |
228 | ||
229 | if (!(e = unit_name_from_path(s->what, ".swap"))) | |
230 | return -ENOMEM; | |
231 | ||
232 | b = unit_has_name(UNIT(s), e); | |
233 | free(e); | |
234 | ||
235 | if (!b) { | |
1124fe6f | 236 | log_error("%s: Value of \"What\" and unit name do not match, not loading.\n", UNIT(s)->id); |
4e85aff4 LP |
237 | return -EINVAL; |
238 | } | |
239 | ||
4819ff03 | 240 | if (s->exec_context.pam_name && s->kill_context.kill_mode != KILL_CONTROL_GROUP) { |
1124fe6f | 241 | log_error("%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing.", UNIT(s)->id); |
e04aad61 LP |
242 | return -EINVAL; |
243 | } | |
244 | ||
4e85aff4 LP |
245 | return 0; |
246 | } | |
247 | ||
07b0b134 ML |
248 | static int swap_load(Unit *u) { |
249 | int r; | |
250 | Swap *s = SWAP(u); | |
251 | ||
252 | assert(s); | |
ac155bb8 | 253 | assert(u->load_state == UNIT_STUB); |
07b0b134 ML |
254 | |
255 | /* Load a .swap file */ | |
256 | if ((r = unit_load_fragment_and_dropin_optional(u)) < 0) | |
257 | return r; | |
258 | ||
ac155bb8 | 259 | if (u->load_state == UNIT_LOADED) { |
27abbe82 LP |
260 | if ((r = unit_add_exec_dependencies(u, &s->exec_context)) < 0) |
261 | return r; | |
4e85aff4 | 262 | |
1124fe6f | 263 | if (UNIT(s)->fragment_path) |
4e85aff4 LP |
264 | s->from_fragment = true; |
265 | ||
266 | if (!s->what) { | |
267 | if (s->parameters_fragment.what) | |
268 | s->what = strdup(s->parameters_fragment.what); | |
4e85aff4 LP |
269 | else if (s->parameters_proc_swaps.what) |
270 | s->what = strdup(s->parameters_proc_swaps.what); | |
271 | else | |
ac155bb8 | 272 | s->what = unit_name_to_path(u->id); |
4e85aff4 LP |
273 | |
274 | if (!s->what) | |
07b0b134 | 275 | return -ENOMEM; |
4e85aff4 | 276 | } |
07b0b134 ML |
277 | |
278 | path_kill_slashes(s->what); | |
279 | ||
1124fe6f | 280 | if (!UNIT(s)->description) |
4e85aff4 LP |
281 | if ((r = unit_set_description(u, s->what)) < 0) |
282 | return r; | |
283 | ||
173a8d04 | 284 | if ((r = swap_add_device_links(s)) < 0) |
07b0b134 ML |
285 | return r; |
286 | ||
6e2ef85b LP |
287 | if ((r = swap_add_mount_links(s)) < 0) |
288 | return r; | |
07b0b134 ML |
289 | |
290 | if ((r = swap_add_target_links(s)) < 0) | |
291 | return r; | |
2edd4434 | 292 | |
d686d8a9 | 293 | if ((r = unit_add_default_cgroups(u)) < 0) |
f1a1cd64 LP |
294 | return r; |
295 | ||
1124fe6f | 296 | if (UNIT(s)->default_dependencies) |
2edd4434 LP |
297 | if ((r = swap_add_default_dependencies(s)) < 0) |
298 | return r; | |
e06c73cc | 299 | |
cba6e062 | 300 | r = unit_exec_context_defaults(u, &s->exec_context); |
e06c73cc LP |
301 | if (r < 0) |
302 | return r; | |
07b0b134 ML |
303 | } |
304 | ||
305 | return swap_verify(s); | |
306 | } | |
307 | ||
6b1dc2bd | 308 | static int swap_add_one( |
4e85aff4 LP |
309 | Manager *m, |
310 | const char *what, | |
e04aad61 | 311 | const char *what_proc_swaps, |
4e85aff4 LP |
312 | int priority, |
313 | bool noauto, | |
173a8d04 | 314 | bool nofail, |
e04aad61 LP |
315 | bool set_flags) { |
316 | ||
4e85aff4 | 317 | Unit *u = NULL; |
e04aad61 | 318 | char *e = NULL, *wp = NULL; |
2c7c6144 | 319 | bool delete = false; |
07b0b134 | 320 | int r; |
4e85aff4 | 321 | SwapParameters *p; |
6b1dc2bd | 322 | Swap *first; |
4e85aff4 LP |
323 | |
324 | assert(m); | |
325 | assert(what); | |
6b1dc2bd | 326 | assert(what_proc_swaps); |
07b0b134 | 327 | |
7d17cfbc MS |
328 | e = unit_name_from_path(what, ".swap"); |
329 | if (!e) | |
07b0b134 ML |
330 | return -ENOMEM; |
331 | ||
e04aad61 LP |
332 | u = manager_get_unit(m, e); |
333 | ||
6b1dc2bd | 334 | if (u && |
e04aad61 LP |
335 | SWAP(u)->from_proc_swaps && |
336 | !path_equal(SWAP(u)->parameters_proc_swaps.what, what_proc_swaps)) | |
337 | return -EEXIST; | |
4e85aff4 LP |
338 | |
339 | if (!u) { | |
07b0b134 ML |
340 | delete = true; |
341 | ||
7d17cfbc MS |
342 | u = unit_new(m, sizeof(Swap)); |
343 | if (!u) { | |
07b0b134 ML |
344 | free(e); |
345 | return -ENOMEM; | |
346 | } | |
e04aad61 | 347 | |
7d17cfbc MS |
348 | r = unit_add_name(u, e); |
349 | if (r < 0) | |
e04aad61 LP |
350 | goto fail; |
351 | ||
7d17cfbc MS |
352 | SWAP(u)->what = strdup(what); |
353 | if (!SWAP(u)->what) { | |
e04aad61 LP |
354 | r = -ENOMEM; |
355 | goto fail; | |
356 | } | |
357 | ||
358 | unit_add_to_load_queue(u); | |
4e85aff4 LP |
359 | } else |
360 | delete = false; | |
07b0b134 | 361 | |
6b1dc2bd | 362 | p = &SWAP(u)->parameters_proc_swaps; |
07b0b134 | 363 | |
6b1dc2bd LP |
364 | if (!p->what) { |
365 | if (!(wp = strdup(what_proc_swaps))) { | |
366 | r = -ENOMEM; | |
367 | goto fail; | |
368 | } | |
e04aad61 | 369 | |
6b1dc2bd LP |
370 | if (!m->swaps_by_proc_swaps) |
371 | if (!(m->swaps_by_proc_swaps = hashmap_new(string_hash_func, string_compare_func))) { | |
e04aad61 LP |
372 | r = -ENOMEM; |
373 | goto fail; | |
374 | } | |
375 | ||
6b1dc2bd LP |
376 | free(p->what); |
377 | p->what = wp; | |
e04aad61 | 378 | |
6b1dc2bd LP |
379 | first = hashmap_get(m->swaps_by_proc_swaps, wp); |
380 | LIST_PREPEND(Swap, same_proc_swaps, first, SWAP(u)); | |
e04aad61 | 381 | |
6b1dc2bd | 382 | if ((r = hashmap_replace(m->swaps_by_proc_swaps, wp, first)) < 0) |
e04aad61 | 383 | goto fail; |
6b1dc2bd | 384 | } |
e04aad61 | 385 | |
6b1dc2bd LP |
386 | if (set_flags) { |
387 | SWAP(u)->is_active = true; | |
388 | SWAP(u)->just_activated = !SWAP(u)->from_proc_swaps; | |
4e85aff4 | 389 | } |
07b0b134 | 390 | |
6b1dc2bd LP |
391 | SWAP(u)->from_proc_swaps = true; |
392 | ||
4e85aff4 LP |
393 | p->priority = priority; |
394 | p->noauto = noauto; | |
173a8d04 | 395 | p->nofail = nofail; |
07b0b134 | 396 | |
4e85aff4 | 397 | unit_add_to_dbus_queue(u); |
07b0b134 | 398 | |
4e85aff4 | 399 | free(e); |
07b0b134 ML |
400 | |
401 | return 0; | |
402 | ||
403 | fail: | |
e04aad61 LP |
404 | log_warning("Failed to load swap unit: %s", strerror(-r)); |
405 | ||
406 | free(wp); | |
4e85aff4 LP |
407 | free(e); |
408 | ||
409 | if (delete && u) | |
07b0b134 ML |
410 | unit_free(u); |
411 | ||
4e85aff4 | 412 | return r; |
07b0b134 ML |
413 | } |
414 | ||
e04aad61 LP |
415 | static int swap_process_new_swap(Manager *m, const char *device, int prio, bool set_flags) { |
416 | struct stat st; | |
417 | int r = 0, k; | |
418 | ||
419 | assert(m); | |
420 | ||
421 | if (stat(device, &st) >= 0 && S_ISBLK(st.st_mode)) { | |
422 | struct udev_device *d; | |
423 | const char *dn; | |
424 | struct udev_list_entry *item = NULL, *first = NULL; | |
425 | ||
426 | /* So this is a proper swap device. Create swap units | |
427 | * for all names this swap device is known under */ | |
428 | ||
429 | if (!(d = udev_device_new_from_devnum(m->udev, 'b', st.st_rdev))) | |
430 | return -ENOMEM; | |
431 | ||
8d8e9456 LP |
432 | dn = udev_device_get_devnode(d); |
433 | if (dn) | |
434 | r = swap_add_one(m, dn, device, prio, false, false, set_flags); | |
e04aad61 LP |
435 | |
436 | /* Add additional units for all symlinks */ | |
437 | first = udev_device_get_devlinks_list_entry(d); | |
438 | udev_list_entry_foreach(item, first) { | |
439 | const char *p; | |
440 | ||
441 | /* Don't bother with the /dev/block links */ | |
442 | p = udev_list_entry_get_name(item); | |
443 | ||
444 | if (path_startswith(p, "/dev/block/")) | |
445 | continue; | |
446 | ||
447 | if (stat(p, &st) >= 0) | |
448 | if ((!S_ISBLK(st.st_mode)) || st.st_rdev != udev_device_get_devnum(d)) | |
449 | continue; | |
450 | ||
8d8e9456 LP |
451 | k = swap_add_one(m, p, device, prio, false, false, set_flags); |
452 | if (k < 0) | |
e04aad61 LP |
453 | r = k; |
454 | } | |
455 | ||
456 | udev_device_unref(d); | |
457 | } | |
458 | ||
8d8e9456 LP |
459 | k = swap_add_one(m, device, device, prio, false, false, set_flags); |
460 | if (k < 0) | |
e04aad61 LP |
461 | r = k; |
462 | ||
463 | return r; | |
464 | } | |
465 | ||
07b0b134 ML |
466 | static void swap_set_state(Swap *s, SwapState state) { |
467 | SwapState old_state; | |
e04aad61 | 468 | |
07b0b134 ML |
469 | assert(s); |
470 | ||
471 | old_state = s->state; | |
472 | s->state = state; | |
473 | ||
e04aad61 LP |
474 | if (state != SWAP_ACTIVATING && |
475 | state != SWAP_ACTIVATING_SIGTERM && | |
476 | state != SWAP_ACTIVATING_SIGKILL && | |
477 | state != SWAP_DEACTIVATING && | |
478 | state != SWAP_DEACTIVATING_SIGTERM && | |
479 | state != SWAP_DEACTIVATING_SIGKILL) { | |
480 | unit_unwatch_timer(UNIT(s), &s->timer_watch); | |
481 | swap_unwatch_control_pid(s); | |
482 | s->control_command = NULL; | |
483 | s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; | |
484 | } | |
485 | ||
07b0b134 ML |
486 | if (state != old_state) |
487 | log_debug("%s changed %s -> %s", | |
1124fe6f | 488 | UNIT(s)->id, |
07b0b134 ML |
489 | swap_state_to_string(old_state), |
490 | swap_state_to_string(state)); | |
491 | ||
e2f3b44c | 492 | unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], true); |
07b0b134 ML |
493 | } |
494 | ||
495 | static int swap_coldplug(Unit *u) { | |
496 | Swap *s = SWAP(u); | |
497 | SwapState new_state = SWAP_DEAD; | |
e04aad61 | 498 | int r; |
07b0b134 ML |
499 | |
500 | assert(s); | |
501 | assert(s->state == SWAP_DEAD); | |
502 | ||
503 | if (s->deserialized_state != s->state) | |
504 | new_state = s->deserialized_state; | |
4e85aff4 | 505 | else if (s->from_proc_swaps) |
07b0b134 ML |
506 | new_state = SWAP_ACTIVE; |
507 | ||
e04aad61 LP |
508 | if (new_state != s->state) { |
509 | ||
510 | if (new_state == SWAP_ACTIVATING || | |
511 | new_state == SWAP_ACTIVATING_SIGTERM || | |
512 | new_state == SWAP_ACTIVATING_SIGKILL || | |
513 | new_state == SWAP_DEACTIVATING || | |
514 | new_state == SWAP_DEACTIVATING_SIGTERM || | |
515 | new_state == SWAP_DEACTIVATING_SIGKILL) { | |
516 | ||
517 | if (s->control_pid <= 0) | |
518 | return -EBADMSG; | |
519 | ||
520 | if ((r = unit_watch_pid(UNIT(s), s->control_pid)) < 0) | |
521 | return r; | |
522 | ||
523 | if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0) | |
524 | return r; | |
525 | } | |
526 | ||
4e85aff4 | 527 | swap_set_state(s, new_state); |
e04aad61 | 528 | } |
07b0b134 ML |
529 | |
530 | return 0; | |
531 | } | |
532 | ||
533 | static void swap_dump(Unit *u, FILE *f, const char *prefix) { | |
534 | Swap *s = SWAP(u); | |
4e85aff4 | 535 | SwapParameters *p; |
07b0b134 ML |
536 | |
537 | assert(s); | |
4e85aff4 LP |
538 | assert(f); |
539 | ||
540 | if (s->from_proc_swaps) | |
541 | p = &s->parameters_proc_swaps; | |
542 | else if (s->from_fragment) | |
543 | p = &s->parameters_fragment; | |
b6bfc7bb LP |
544 | else |
545 | p = NULL; | |
07b0b134 ML |
546 | |
547 | fprintf(f, | |
4e85aff4 | 548 | "%sSwap State: %s\n" |
e1770af8 | 549 | "%sResult: %s\n" |
07b0b134 | 550 | "%sWhat: %s\n" |
4e85aff4 LP |
551 | "%sFrom /proc/swaps: %s\n" |
552 | "%sFrom fragment: %s\n", | |
07b0b134 | 553 | prefix, swap_state_to_string(s->state), |
e1770af8 | 554 | prefix, swap_result_to_string(s->result), |
07b0b134 | 555 | prefix, s->what, |
4e85aff4 LP |
556 | prefix, yes_no(s->from_proc_swaps), |
557 | prefix, yes_no(s->from_fragment)); | |
e04aad61 | 558 | |
b6bfc7bb LP |
559 | if (p) |
560 | fprintf(f, | |
561 | "%sPriority: %i\n" | |
562 | "%sNoAuto: %s\n" | |
563 | "%sNoFail: %s\n", | |
564 | prefix, p->priority, | |
565 | prefix, yes_no(p->noauto), | |
566 | prefix, yes_no(p->nofail)); | |
567 | ||
e04aad61 LP |
568 | if (s->control_pid > 0) |
569 | fprintf(f, | |
570 | "%sControl PID: %lu\n", | |
571 | prefix, (unsigned long) s->control_pid); | |
572 | ||
573 | exec_context_dump(&s->exec_context, f, prefix); | |
4819ff03 | 574 | kill_context_dump(&s->kill_context, f, prefix); |
e04aad61 LP |
575 | } |
576 | ||
577 | static int swap_spawn(Swap *s, ExecCommand *c, pid_t *_pid) { | |
578 | pid_t pid; | |
579 | int r; | |
580 | ||
581 | assert(s); | |
582 | assert(c); | |
583 | assert(_pid); | |
584 | ||
585 | if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0) | |
586 | goto fail; | |
587 | ||
588 | if ((r = exec_spawn(c, | |
589 | NULL, | |
590 | &s->exec_context, | |
591 | NULL, 0, | |
1124fe6f | 592 | UNIT(s)->manager->environment, |
e04aad61 LP |
593 | true, |
594 | true, | |
595 | true, | |
1124fe6f MS |
596 | UNIT(s)->manager->confirm_spawn, |
597 | UNIT(s)->cgroup_bondings, | |
598 | UNIT(s)->cgroup_attributes, | |
ecedd90f | 599 | NULL, |
62bca2c6 | 600 | UNIT(s)->id, |
f2b68789 | 601 | NULL, |
e04aad61 LP |
602 | &pid)) < 0) |
603 | goto fail; | |
604 | ||
605 | if ((r = unit_watch_pid(UNIT(s), pid)) < 0) | |
606 | /* FIXME: we need to do something here */ | |
607 | goto fail; | |
608 | ||
609 | *_pid = pid; | |
610 | ||
611 | return 0; | |
612 | ||
613 | fail: | |
614 | unit_unwatch_timer(UNIT(s), &s->timer_watch); | |
615 | ||
616 | return r; | |
07b0b134 ML |
617 | } |
618 | ||
e1770af8 | 619 | static void swap_enter_dead(Swap *s, SwapResult f) { |
07b0b134 ML |
620 | assert(s); |
621 | ||
e1770af8 LP |
622 | if (f != SWAP_SUCCESS) |
623 | s->result = f; | |
e04aad61 | 624 | |
e1770af8 | 625 | swap_set_state(s, s->result != SWAP_SUCCESS ? SWAP_FAILED : SWAP_DEAD); |
07b0b134 ML |
626 | } |
627 | ||
e1770af8 | 628 | static void swap_enter_active(Swap *s, SwapResult f) { |
e04aad61 LP |
629 | assert(s); |
630 | ||
e1770af8 LP |
631 | if (f != SWAP_SUCCESS) |
632 | s->result = f; | |
e04aad61 LP |
633 | |
634 | swap_set_state(s, SWAP_ACTIVE); | |
635 | } | |
636 | ||
e1770af8 | 637 | static void swap_enter_signal(Swap *s, SwapState state, SwapResult f) { |
07b0b134 | 638 | int r; |
e04aad61 LP |
639 | Set *pid_set = NULL; |
640 | bool wait_for_exit = false; | |
07b0b134 ML |
641 | |
642 | assert(s); | |
e04aad61 | 643 | |
e1770af8 LP |
644 | if (f != SWAP_SUCCESS) |
645 | s->result = f; | |
e04aad61 | 646 | |
4819ff03 | 647 | if (s->kill_context.kill_mode != KILL_NONE) { |
e04aad61 | 648 | int sig = (state == SWAP_ACTIVATING_SIGTERM || |
4819ff03 | 649 | state == SWAP_DEACTIVATING_SIGTERM) ? s->kill_context.kill_signal : SIGKILL; |
e04aad61 LP |
650 | |
651 | if (s->control_pid > 0) { | |
cd25cce9 | 652 | if (kill_and_sigcont(s->control_pid, sig) < 0 && errno != ESRCH) |
e04aad61 LP |
653 | |
654 | log_warning("Failed to kill control process %li: %m", (long) s->control_pid); | |
655 | else | |
656 | wait_for_exit = true; | |
657 | } | |
658 | ||
4819ff03 | 659 | if (s->kill_context.kill_mode == KILL_CONTROL_GROUP) { |
e04aad61 LP |
660 | |
661 | if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func))) { | |
662 | r = -ENOMEM; | |
663 | goto fail; | |
664 | } | |
665 | ||
666 | /* Exclude the control pid from being killed via the cgroup */ | |
667 | if (s->control_pid > 0) | |
668 | if ((r = set_put(pid_set, LONG_TO_PTR(s->control_pid))) < 0) | |
669 | goto fail; | |
670 | ||
88f3e0c9 | 671 | r = cgroup_bonding_kill_list(UNIT(s)->cgroup_bondings, sig, true, false, pid_set, NULL); |
ecedd90f | 672 | if (r < 0) { |
e04aad61 LP |
673 | if (r != -EAGAIN && r != -ESRCH && r != -ENOENT) |
674 | log_warning("Failed to kill control group: %s", strerror(-r)); | |
675 | } else if (r > 0) | |
676 | wait_for_exit = true; | |
677 | ||
678 | set_free(pid_set); | |
da19d5c1 | 679 | pid_set = NULL; |
e04aad61 LP |
680 | } |
681 | } | |
682 | ||
683 | if (wait_for_exit) { | |
684 | if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0) | |
685 | goto fail; | |
686 | ||
687 | swap_set_state(s, state); | |
688 | } else | |
e1770af8 | 689 | swap_enter_dead(s, SWAP_SUCCESS); |
e04aad61 LP |
690 | |
691 | return; | |
692 | ||
693 | fail: | |
1124fe6f | 694 | log_warning("%s failed to kill processes: %s", UNIT(s)->id, strerror(-r)); |
e04aad61 | 695 | |
e1770af8 | 696 | swap_enter_dead(s, SWAP_FAILURE_RESOURCES); |
e04aad61 LP |
697 | |
698 | if (pid_set) | |
699 | set_free(pid_set); | |
700 | } | |
701 | ||
702 | static void swap_enter_activating(Swap *s) { | |
703 | int r, priority; | |
704 | ||
705 | assert(s); | |
706 | ||
707 | s->control_command_id = SWAP_EXEC_ACTIVATE; | |
708 | s->control_command = s->exec_command + SWAP_EXEC_ACTIVATE; | |
07b0b134 | 709 | |
4e85aff4 LP |
710 | if (s->from_fragment) |
711 | priority = s->parameters_fragment.priority; | |
e04aad61 LP |
712 | else |
713 | priority = -1; | |
4e85aff4 | 714 | |
e04aad61 LP |
715 | if (priority >= 0) { |
716 | char p[LINE_MAX]; | |
07b0b134 | 717 | |
e04aad61 LP |
718 | snprintf(p, sizeof(p), "%i", priority); |
719 | char_array_0(p); | |
07b0b134 | 720 | |
e04aad61 LP |
721 | r = exec_command_set( |
722 | s->control_command, | |
723 | "/sbin/swapon", | |
724 | "-p", | |
725 | p, | |
726 | s->what, | |
727 | NULL); | |
728 | } else | |
729 | r = exec_command_set( | |
730 | s->control_command, | |
731 | "/sbin/swapon", | |
732 | s->what, | |
733 | NULL); | |
734 | ||
735 | if (r < 0) | |
736 | goto fail; | |
737 | ||
738 | swap_unwatch_control_pid(s); | |
739 | ||
740 | if ((r = swap_spawn(s, s->control_command, &s->control_pid)) < 0) | |
741 | goto fail; | |
742 | ||
743 | swap_set_state(s, SWAP_ACTIVATING); | |
744 | ||
745 | return; | |
746 | ||
747 | fail: | |
1124fe6f | 748 | log_warning("%s failed to run 'swapon' task: %s", UNIT(s)->id, strerror(-r)); |
e1770af8 | 749 | swap_enter_dead(s, SWAP_FAILURE_RESOURCES); |
e04aad61 LP |
750 | } |
751 | ||
e1770af8 | 752 | static void swap_enter_deactivating(Swap *s) { |
e04aad61 LP |
753 | int r; |
754 | ||
755 | assert(s); | |
756 | ||
e04aad61 LP |
757 | s->control_command_id = SWAP_EXEC_DEACTIVATE; |
758 | s->control_command = s->exec_command + SWAP_EXEC_DEACTIVATE; | |
759 | ||
760 | if ((r = exec_command_set( | |
761 | s->control_command, | |
762 | "/sbin/swapoff", | |
763 | s->what, | |
764 | NULL)) < 0) | |
765 | goto fail; | |
766 | ||
767 | swap_unwatch_control_pid(s); | |
768 | ||
769 | if ((r = swap_spawn(s, s->control_command, &s->control_pid)) < 0) | |
770 | goto fail; | |
771 | ||
772 | swap_set_state(s, SWAP_DEACTIVATING); | |
773 | ||
774 | return; | |
775 | ||
776 | fail: | |
1124fe6f | 777 | log_warning("%s failed to run 'swapoff' task: %s", UNIT(s)->id, strerror(-r)); |
e1770af8 | 778 | swap_enter_active(s, SWAP_FAILURE_RESOURCES); |
e04aad61 LP |
779 | } |
780 | ||
781 | static int swap_start(Unit *u) { | |
782 | Swap *s = SWAP(u); | |
783 | ||
784 | assert(s); | |
785 | ||
786 | /* We cannot fulfill this request right now, try again later | |
787 | * please! */ | |
788 | ||
789 | if (s->state == SWAP_DEACTIVATING || | |
790 | s->state == SWAP_DEACTIVATING_SIGTERM || | |
791 | s->state == SWAP_DEACTIVATING_SIGKILL || | |
792 | s->state == SWAP_ACTIVATING_SIGTERM || | |
793 | s->state == SWAP_ACTIVATING_SIGKILL) | |
794 | return -EAGAIN; | |
795 | ||
796 | if (s->state == SWAP_ACTIVATING) | |
797 | return 0; | |
798 | ||
799 | assert(s->state == SWAP_DEAD || s->state == SWAP_FAILED); | |
800 | ||
a5c3034f LP |
801 | if (detect_container(NULL) > 0) |
802 | return -EPERM; | |
803 | ||
e1770af8 | 804 | s->result = SWAP_SUCCESS; |
e04aad61 | 805 | swap_enter_activating(s); |
07b0b134 ML |
806 | return 0; |
807 | } | |
808 | ||
809 | static int swap_stop(Unit *u) { | |
810 | Swap *s = SWAP(u); | |
07b0b134 ML |
811 | |
812 | assert(s); | |
813 | ||
e04aad61 LP |
814 | if (s->state == SWAP_DEACTIVATING || |
815 | s->state == SWAP_DEACTIVATING_SIGTERM || | |
816 | s->state == SWAP_DEACTIVATING_SIGKILL || | |
817 | s->state == SWAP_ACTIVATING_SIGTERM || | |
818 | s->state == SWAP_ACTIVATING_SIGKILL) | |
819 | return 0; | |
07b0b134 | 820 | |
e04aad61 LP |
821 | assert(s->state == SWAP_ACTIVATING || |
822 | s->state == SWAP_ACTIVE); | |
07b0b134 | 823 | |
a5c3034f LP |
824 | if (detect_container(NULL) > 0) |
825 | return -EPERM; | |
826 | ||
e1770af8 | 827 | swap_enter_deactivating(s); |
07b0b134 ML |
828 | return 0; |
829 | } | |
830 | ||
831 | static int swap_serialize(Unit *u, FILE *f, FDSet *fds) { | |
832 | Swap *s = SWAP(u); | |
833 | ||
834 | assert(s); | |
835 | assert(f); | |
836 | assert(fds); | |
837 | ||
838 | unit_serialize_item(u, f, "state", swap_state_to_string(s->state)); | |
e1770af8 | 839 | unit_serialize_item(u, f, "result", swap_result_to_string(s->result)); |
e04aad61 LP |
840 | |
841 | if (s->control_pid > 0) | |
842 | unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) s->control_pid); | |
843 | ||
844 | if (s->control_command_id >= 0) | |
845 | unit_serialize_item(u, f, "control-command", swap_exec_command_to_string(s->control_command_id)); | |
07b0b134 ML |
846 | |
847 | return 0; | |
848 | } | |
849 | ||
850 | static int swap_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
851 | Swap *s = SWAP(u); | |
852 | ||
853 | assert(s); | |
854 | assert(fds); | |
855 | ||
856 | if (streq(key, "state")) { | |
857 | SwapState state; | |
858 | ||
859 | if ((state = swap_state_from_string(value)) < 0) | |
860 | log_debug("Failed to parse state value %s", value); | |
861 | else | |
862 | s->deserialized_state = state; | |
e1770af8 LP |
863 | } else if (streq(key, "result")) { |
864 | SwapResult f; | |
865 | ||
866 | f = swap_result_from_string(value); | |
867 | if (f < 0) | |
868 | log_debug("Failed to parse result value %s", value); | |
869 | else if (f != SWAP_SUCCESS) | |
870 | s->result = f; | |
e04aad61 LP |
871 | } else if (streq(key, "control-pid")) { |
872 | pid_t pid; | |
873 | ||
874 | if (parse_pid(value, &pid) < 0) | |
875 | log_debug("Failed to parse control-pid value %s", value); | |
876 | else | |
877 | s->control_pid = pid; | |
878 | ||
879 | } else if (streq(key, "control-command")) { | |
880 | SwapExecCommand id; | |
881 | ||
882 | if ((id = swap_exec_command_from_string(value)) < 0) | |
883 | log_debug("Failed to parse exec-command value %s", value); | |
884 | else { | |
885 | s->control_command_id = id; | |
886 | s->control_command = s->exec_command + id; | |
887 | } | |
888 | ||
07b0b134 ML |
889 | } else |
890 | log_debug("Unknown serialization key '%s'", key); | |
891 | ||
892 | return 0; | |
893 | } | |
894 | ||
895 | static UnitActiveState swap_active_state(Unit *u) { | |
896 | assert(u); | |
897 | ||
898 | return state_translation_table[SWAP(u)->state]; | |
899 | } | |
900 | ||
901 | static const char *swap_sub_state_to_string(Unit *u) { | |
902 | assert(u); | |
903 | ||
904 | return swap_state_to_string(SWAP(u)->state); | |
905 | } | |
906 | ||
907 | static bool swap_check_gc(Unit *u) { | |
908 | Swap *s = SWAP(u); | |
909 | ||
910 | assert(s); | |
911 | ||
6b1dc2bd | 912 | return s->from_proc_swaps; |
07b0b134 ML |
913 | } |
914 | ||
e04aad61 LP |
915 | static void swap_sigchld_event(Unit *u, pid_t pid, int code, int status) { |
916 | Swap *s = SWAP(u); | |
e1770af8 | 917 | SwapResult f; |
e04aad61 LP |
918 | |
919 | assert(s); | |
920 | assert(pid >= 0); | |
921 | ||
922 | if (pid != s->control_pid) | |
923 | return; | |
924 | ||
925 | s->control_pid = 0; | |
926 | ||
96342de6 | 927 | if (is_clean_exit(code, status, NULL)) |
e1770af8 LP |
928 | f = SWAP_SUCCESS; |
929 | else if (code == CLD_EXITED) | |
930 | f = SWAP_FAILURE_EXIT_CODE; | |
931 | else if (code == CLD_KILLED) | |
932 | f = SWAP_FAILURE_SIGNAL; | |
933 | else if (code == CLD_DUMPED) | |
934 | f = SWAP_FAILURE_CORE_DUMP; | |
935 | else | |
936 | assert_not_reached("Unknown code"); | |
937 | ||
938 | if (f != SWAP_SUCCESS) | |
939 | s->result = f; | |
e04aad61 LP |
940 | |
941 | if (s->control_command) { | |
6ea832a2 | 942 | exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status); |
e1770af8 | 943 | |
e04aad61 LP |
944 | s->control_command = NULL; |
945 | s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; | |
946 | } | |
947 | ||
e1770af8 | 948 | log_full(f == SWAP_SUCCESS ? LOG_DEBUG : LOG_NOTICE, |
ac155bb8 | 949 | "%s swap process exited, code=%s status=%i", u->id, sigchld_code_to_string(code), status); |
e04aad61 LP |
950 | |
951 | switch (s->state) { | |
952 | ||
953 | case SWAP_ACTIVATING: | |
954 | case SWAP_ACTIVATING_SIGTERM: | |
955 | case SWAP_ACTIVATING_SIGKILL: | |
956 | ||
e1770af8 LP |
957 | if (f == SWAP_SUCCESS) |
958 | swap_enter_active(s, f); | |
e04aad61 | 959 | else |
e1770af8 | 960 | swap_enter_dead(s, f); |
e04aad61 LP |
961 | break; |
962 | ||
963 | case SWAP_DEACTIVATING: | |
964 | case SWAP_DEACTIVATING_SIGKILL: | |
965 | case SWAP_DEACTIVATING_SIGTERM: | |
966 | ||
e1770af8 LP |
967 | if (f == SWAP_SUCCESS) |
968 | swap_enter_dead(s, f); | |
e04aad61 | 969 | else |
e1770af8 | 970 | swap_enter_dead(s, f); |
e04aad61 LP |
971 | break; |
972 | ||
973 | default: | |
974 | assert_not_reached("Uh, control process died at wrong time."); | |
975 | } | |
976 | ||
977 | /* Notify clients about changed exit status */ | |
978 | unit_add_to_dbus_queue(u); | |
979 | ||
980 | /* Request a reload of /proc/swaps, so that following units | |
981 | * can follow our state change */ | |
ac155bb8 | 982 | u->manager->request_reload = true; |
e04aad61 LP |
983 | } |
984 | ||
985 | static void swap_timer_event(Unit *u, uint64_t elapsed, Watch *w) { | |
986 | Swap *s = SWAP(u); | |
987 | ||
988 | assert(s); | |
989 | assert(elapsed == 1); | |
990 | assert(w == &s->timer_watch); | |
991 | ||
992 | switch (s->state) { | |
993 | ||
994 | case SWAP_ACTIVATING: | |
ac155bb8 | 995 | log_warning("%s activation timed out. Stopping.", u->id); |
e1770af8 | 996 | swap_enter_signal(s, SWAP_ACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT); |
e04aad61 LP |
997 | break; |
998 | ||
999 | case SWAP_DEACTIVATING: | |
ac155bb8 | 1000 | log_warning("%s deactivation timed out. Stopping.", u->id); |
e1770af8 | 1001 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT); |
e04aad61 LP |
1002 | break; |
1003 | ||
1004 | case SWAP_ACTIVATING_SIGTERM: | |
4819ff03 | 1005 | if (s->kill_context.send_sigkill) { |
ac155bb8 | 1006 | log_warning("%s activation timed out. Killing.", u->id); |
e1770af8 | 1007 | swap_enter_signal(s, SWAP_ACTIVATING_SIGKILL, SWAP_FAILURE_TIMEOUT); |
ba035df2 | 1008 | } else { |
ac155bb8 | 1009 | log_warning("%s activation timed out. Skipping SIGKILL. Ignoring.", u->id); |
e1770af8 | 1010 | swap_enter_dead(s, SWAP_FAILURE_TIMEOUT); |
ba035df2 | 1011 | } |
e04aad61 LP |
1012 | break; |
1013 | ||
1014 | case SWAP_DEACTIVATING_SIGTERM: | |
4819ff03 | 1015 | if (s->kill_context.send_sigkill) { |
ac155bb8 | 1016 | log_warning("%s deactivation timed out. Killing.", u->id); |
e1770af8 | 1017 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, SWAP_FAILURE_TIMEOUT); |
ba035df2 | 1018 | } else { |
ac155bb8 | 1019 | log_warning("%s deactivation timed out. Skipping SIGKILL. Ignoring.", u->id); |
e1770af8 | 1020 | swap_enter_dead(s, SWAP_FAILURE_TIMEOUT); |
ba035df2 | 1021 | } |
e04aad61 LP |
1022 | break; |
1023 | ||
1024 | case SWAP_ACTIVATING_SIGKILL: | |
1025 | case SWAP_DEACTIVATING_SIGKILL: | |
ac155bb8 | 1026 | log_warning("%s swap process still around after SIGKILL. Ignoring.", u->id); |
e1770af8 | 1027 | swap_enter_dead(s, SWAP_FAILURE_TIMEOUT); |
e04aad61 LP |
1028 | break; |
1029 | ||
1030 | default: | |
1031 | assert_not_reached("Timeout at wrong time."); | |
1032 | } | |
1033 | } | |
1034 | ||
1035 | static int swap_load_proc_swaps(Manager *m, bool set_flags) { | |
1036 | unsigned i; | |
1037 | int r = 0; | |
1038 | ||
1039 | assert(m); | |
1040 | ||
07b0b134 | 1041 | rewind(m->proc_swaps); |
bab45044 | 1042 | |
4e85aff4 | 1043 | (void) fscanf(m->proc_swaps, "%*s %*s %*s %*s %*s\n"); |
07b0b134 | 1044 | |
e04aad61 | 1045 | for (i = 1;; i++) { |
07b0b134 ML |
1046 | char *dev = NULL, *d; |
1047 | int prio = 0, k; | |
1048 | ||
4e85aff4 | 1049 | if ((k = fscanf(m->proc_swaps, |
e04aad61 LP |
1050 | "%ms " /* device/file */ |
1051 | "%*s " /* type of swap */ | |
1052 | "%*s " /* swap size */ | |
1053 | "%*s " /* used */ | |
4e85aff4 LP |
1054 | "%i\n", /* priority */ |
1055 | &dev, &prio)) != 2) { | |
07b0b134 | 1056 | |
07b0b134 | 1057 | if (k == EOF) |
4e85aff4 | 1058 | break; |
07b0b134 | 1059 | |
e04aad61 | 1060 | log_warning("Failed to parse /proc/swaps:%u.", i); |
07b0b134 | 1061 | free(dev); |
e04aad61 | 1062 | continue; |
07b0b134 | 1063 | } |
07b0b134 | 1064 | |
4e85aff4 | 1065 | d = cunescape(dev); |
07b0b134 | 1066 | free(dev); |
4e85aff4 LP |
1067 | |
1068 | if (!d) | |
1069 | return -ENOMEM; | |
1070 | ||
e04aad61 | 1071 | k = swap_process_new_swap(m, d, prio, set_flags); |
07b0b134 ML |
1072 | free(d); |
1073 | ||
1074 | if (k < 0) | |
e04aad61 | 1075 | r = k; |
07b0b134 ML |
1076 | } |
1077 | ||
e04aad61 LP |
1078 | return r; |
1079 | } | |
1080 | ||
1081 | int swap_dispatch_reload(Manager *m) { | |
4e434314 | 1082 | /* This function should go as soon as the kernel properly notifies us */ |
e04aad61 LP |
1083 | |
1084 | if (_likely_(!m->request_reload)) | |
1085 | return 0; | |
1086 | ||
1087 | m->request_reload = false; | |
1088 | ||
4e434314 LP |
1089 | return swap_fd_event(m, EPOLLPRI); |
1090 | } | |
1091 | ||
1092 | int swap_fd_event(Manager *m, int events) { | |
595ed347 | 1093 | Unit *u; |
4e434314 LP |
1094 | int r; |
1095 | ||
1096 | assert(m); | |
1097 | assert(events & EPOLLPRI); | |
1098 | ||
bd40a2d8 | 1099 | if ((r = swap_load_proc_swaps(m, true)) < 0) { |
e04aad61 LP |
1100 | log_error("Failed to reread /proc/swaps: %s", strerror(-r)); |
1101 | ||
1102 | /* Reset flags, just in case, for late calls */ | |
595ed347 MS |
1103 | LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) { |
1104 | Swap *swap = SWAP(u); | |
e04aad61 LP |
1105 | |
1106 | swap->is_active = swap->just_activated = false; | |
1107 | } | |
1108 | ||
1109 | return 0; | |
1110 | } | |
1111 | ||
1112 | manager_dispatch_load_queue(m); | |
1113 | ||
595ed347 MS |
1114 | LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) { |
1115 | Swap *swap = SWAP(u); | |
e04aad61 LP |
1116 | |
1117 | if (!swap->is_active) { | |
1118 | /* This has just been deactivated */ | |
1119 | ||
1120 | swap->from_proc_swaps = false; | |
1121 | swap_unset_proc_swaps(swap); | |
1122 | ||
1123 | switch (swap->state) { | |
1124 | ||
1125 | case SWAP_ACTIVE: | |
e1770af8 | 1126 | swap_enter_dead(swap, SWAP_SUCCESS); |
e04aad61 LP |
1127 | break; |
1128 | ||
1129 | default: | |
1130 | swap_set_state(swap, swap->state); | |
1131 | break; | |
1132 | } | |
1133 | ||
1134 | } else if (swap->just_activated) { | |
1135 | ||
1136 | /* New swap entry */ | |
1137 | ||
1138 | switch (swap->state) { | |
1139 | ||
1140 | case SWAP_DEAD: | |
1141 | case SWAP_FAILED: | |
e1770af8 | 1142 | swap_enter_active(swap, SWAP_SUCCESS); |
e04aad61 LP |
1143 | break; |
1144 | ||
1145 | default: | |
1146 | /* Nothing really changed, but let's | |
1147 | * issue an notification call | |
1148 | * nonetheless, in case somebody is | |
1149 | * waiting for this. */ | |
1150 | swap_set_state(swap, swap->state); | |
1151 | break; | |
1152 | } | |
1153 | } | |
1154 | ||
1155 | /* Reset the flags for later calls */ | |
1156 | swap->is_active = swap->just_activated = false; | |
1157 | } | |
1158 | ||
1159 | return 1; | |
1160 | } | |
1161 | ||
1162 | static Unit *swap_following(Unit *u) { | |
1163 | Swap *s = SWAP(u); | |
1164 | Swap *other, *first = NULL; | |
1165 | ||
1166 | assert(s); | |
1167 | ||
1168 | if (streq_ptr(s->what, s->parameters_proc_swaps.what)) | |
1169 | return NULL; | |
1170 | ||
1171 | /* Make everybody follow the unit that's named after the swap | |
1172 | * device in the kernel */ | |
1173 | ||
1174 | LIST_FOREACH_AFTER(same_proc_swaps, other, s) | |
1175 | if (streq_ptr(other->what, other->parameters_proc_swaps.what)) | |
1176 | return UNIT(other); | |
1177 | ||
1178 | LIST_FOREACH_BEFORE(same_proc_swaps, other, s) { | |
1179 | if (streq_ptr(other->what, other->parameters_proc_swaps.what)) | |
1180 | return UNIT(other); | |
1181 | ||
1182 | first = other; | |
1183 | } | |
1184 | ||
1185 | return UNIT(first); | |
07b0b134 ML |
1186 | } |
1187 | ||
6210e7fc LP |
1188 | static int swap_following_set(Unit *u, Set **_set) { |
1189 | Swap *s = SWAP(u); | |
1190 | Swap *other; | |
1191 | Set *set; | |
1192 | int r; | |
1193 | ||
1194 | assert(s); | |
1195 | assert(_set); | |
1196 | ||
1197 | if (LIST_JUST_US(same_proc_swaps, s)) { | |
1198 | *_set = NULL; | |
1199 | return 0; | |
1200 | } | |
1201 | ||
1202 | if (!(set = set_new(NULL, NULL))) | |
1203 | return -ENOMEM; | |
1204 | ||
1205 | LIST_FOREACH_AFTER(same_proc_swaps, other, s) | |
1206 | if ((r = set_put(set, other)) < 0) | |
1207 | goto fail; | |
1208 | ||
1209 | LIST_FOREACH_BEFORE(same_proc_swaps, other, s) | |
1210 | if ((r = set_put(set, other)) < 0) | |
1211 | goto fail; | |
1212 | ||
1213 | *_set = set; | |
1214 | return 1; | |
1215 | ||
1216 | fail: | |
1217 | set_free(set); | |
1218 | return r; | |
1219 | } | |
1220 | ||
07b0b134 ML |
1221 | static void swap_shutdown(Manager *m) { |
1222 | assert(m); | |
1223 | ||
1224 | if (m->proc_swaps) { | |
1225 | fclose(m->proc_swaps); | |
1226 | m->proc_swaps = NULL; | |
1227 | } | |
e04aad61 LP |
1228 | |
1229 | hashmap_free(m->swaps_by_proc_swaps); | |
1230 | m->swaps_by_proc_swaps = NULL; | |
07b0b134 ML |
1231 | } |
1232 | ||
07b0b134 ML |
1233 | static int swap_enumerate(Manager *m) { |
1234 | int r; | |
4e434314 | 1235 | struct epoll_event ev; |
07b0b134 ML |
1236 | assert(m); |
1237 | ||
4e434314 | 1238 | if (!m->proc_swaps) { |
4e85aff4 | 1239 | if (!(m->proc_swaps = fopen("/proc/swaps", "re"))) |
3f858732 | 1240 | return (errno == ENOENT) ? 0 : -errno; |
07b0b134 | 1241 | |
4e434314 LP |
1242 | m->swap_watch.type = WATCH_SWAP; |
1243 | m->swap_watch.fd = fileno(m->proc_swaps); | |
1244 | ||
1245 | zero(ev); | |
1246 | ev.events = EPOLLPRI; | |
1247 | ev.data.ptr = &m->swap_watch; | |
1248 | ||
1249 | if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->swap_watch.fd, &ev) < 0) | |
1250 | return -errno; | |
1251 | } | |
1252 | ||
e04aad61 | 1253 | if ((r = swap_load_proc_swaps(m, false)) < 0) |
07b0b134 ML |
1254 | swap_shutdown(m); |
1255 | ||
1256 | return r; | |
1257 | } | |
1258 | ||
fdf20a31 | 1259 | static void swap_reset_failed(Unit *u) { |
5632e374 LP |
1260 | Swap *s = SWAP(u); |
1261 | ||
1262 | assert(s); | |
1263 | ||
fdf20a31 | 1264 | if (s->state == SWAP_FAILED) |
5632e374 | 1265 | swap_set_state(s, SWAP_DEAD); |
e04aad61 | 1266 | |
e1770af8 | 1267 | s->result = SWAP_SUCCESS; |
5632e374 LP |
1268 | } |
1269 | ||
c74f17d9 | 1270 | static int swap_kill(Unit *u, KillWho who, int signo, DBusError *error) { |
8a0867d6 LP |
1271 | Swap *s = SWAP(u); |
1272 | int r = 0; | |
1273 | Set *pid_set = NULL; | |
1274 | ||
1275 | assert(s); | |
1276 | ||
1277 | if (who == KILL_MAIN) { | |
1278 | dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "Swap units have no main processes"); | |
a17204af | 1279 | return -ESRCH; |
8a0867d6 LP |
1280 | } |
1281 | ||
1282 | if (s->control_pid <= 0 && who == KILL_CONTROL) { | |
1283 | dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "No control process to kill"); | |
a17204af | 1284 | return -ESRCH; |
8a0867d6 LP |
1285 | } |
1286 | ||
3611581e LP |
1287 | if (who == KILL_CONTROL || who == KILL_ALL) |
1288 | if (s->control_pid > 0) | |
1289 | if (kill(s->control_pid, signo) < 0) | |
1290 | r = -errno; | |
8a0867d6 | 1291 | |
c74f17d9 | 1292 | if (who == KILL_ALL) { |
8a0867d6 LP |
1293 | int q; |
1294 | ||
c74f17d9 LP |
1295 | pid_set = set_new(trivial_hash_func, trivial_compare_func); |
1296 | if (!pid_set) | |
8a0867d6 LP |
1297 | return -ENOMEM; |
1298 | ||
1299 | /* Exclude the control pid from being killed via the cgroup */ | |
c74f17d9 LP |
1300 | if (s->control_pid > 0) { |
1301 | q = set_put(pid_set, LONG_TO_PTR(s->control_pid)); | |
1302 | if (q < 0) { | |
8a0867d6 LP |
1303 | r = q; |
1304 | goto finish; | |
1305 | } | |
c74f17d9 | 1306 | } |
8a0867d6 | 1307 | |
88f3e0c9 | 1308 | q = cgroup_bonding_kill_list(UNIT(s)->cgroup_bondings, signo, false, false, pid_set, NULL); |
c74f17d9 LP |
1309 | if (q < 0 && q != -EAGAIN && q != -ESRCH && q != -ENOENT) |
1310 | r = q; | |
8a0867d6 LP |
1311 | } |
1312 | ||
1313 | finish: | |
1314 | if (pid_set) | |
1315 | set_free(pid_set); | |
1316 | ||
1317 | return r; | |
1318 | } | |
1319 | ||
5632e374 LP |
1320 | static const char* const swap_state_table[_SWAP_STATE_MAX] = { |
1321 | [SWAP_DEAD] = "dead", | |
e04aad61 | 1322 | [SWAP_ACTIVATING] = "activating", |
5632e374 | 1323 | [SWAP_ACTIVE] = "active", |
e04aad61 LP |
1324 | [SWAP_DEACTIVATING] = "deactivating", |
1325 | [SWAP_ACTIVATING_SIGTERM] = "activating-sigterm", | |
1326 | [SWAP_ACTIVATING_SIGKILL] = "activating-sigkill", | |
1327 | [SWAP_DEACTIVATING_SIGTERM] = "deactivating-sigterm", | |
1328 | [SWAP_DEACTIVATING_SIGKILL] = "deactivating-sigkill", | |
fdf20a31 | 1329 | [SWAP_FAILED] = "failed" |
5632e374 LP |
1330 | }; |
1331 | ||
1332 | DEFINE_STRING_TABLE_LOOKUP(swap_state, SwapState); | |
1333 | ||
e04aad61 LP |
1334 | static const char* const swap_exec_command_table[_SWAP_EXEC_COMMAND_MAX] = { |
1335 | [SWAP_EXEC_ACTIVATE] = "ExecActivate", | |
1336 | [SWAP_EXEC_DEACTIVATE] = "ExecDeactivate", | |
1337 | }; | |
1338 | ||
1339 | DEFINE_STRING_TABLE_LOOKUP(swap_exec_command, SwapExecCommand); | |
1340 | ||
e1770af8 LP |
1341 | static const char* const swap_result_table[_SWAP_RESULT_MAX] = { |
1342 | [SWAP_SUCCESS] = "success", | |
1343 | [SWAP_FAILURE_RESOURCES] = "resources", | |
1344 | [SWAP_FAILURE_TIMEOUT] = "timeout", | |
1345 | [SWAP_FAILURE_EXIT_CODE] = "exit-code", | |
1346 | [SWAP_FAILURE_SIGNAL] = "signal", | |
1347 | [SWAP_FAILURE_CORE_DUMP] = "core-dump" | |
1348 | }; | |
1349 | ||
1350 | DEFINE_STRING_TABLE_LOOKUP(swap_result, SwapResult); | |
1351 | ||
07b0b134 | 1352 | const UnitVTable swap_vtable = { |
7d17cfbc | 1353 | .object_size = sizeof(Swap), |
f975e971 LP |
1354 | .sections = |
1355 | "Unit\0" | |
1356 | "Swap\0" | |
1357 | "Install\0", | |
07b0b134 | 1358 | |
e04aad61 | 1359 | .no_alias = true, |
07b0b134 ML |
1360 | .no_instances = true, |
1361 | ||
4e85aff4 | 1362 | .init = swap_init, |
07b0b134 | 1363 | .load = swap_load, |
6e620bec | 1364 | .done = swap_done, |
07b0b134 ML |
1365 | |
1366 | .coldplug = swap_coldplug, | |
1367 | ||
1368 | .dump = swap_dump, | |
1369 | ||
1370 | .start = swap_start, | |
1371 | .stop = swap_stop, | |
1372 | ||
8a0867d6 LP |
1373 | .kill = swap_kill, |
1374 | ||
07b0b134 ML |
1375 | .serialize = swap_serialize, |
1376 | .deserialize_item = swap_deserialize_item, | |
1377 | ||
1378 | .active_state = swap_active_state, | |
1379 | .sub_state_to_string = swap_sub_state_to_string, | |
1380 | ||
1381 | .check_gc = swap_check_gc, | |
1382 | ||
e04aad61 LP |
1383 | .sigchld_event = swap_sigchld_event, |
1384 | .timer_event = swap_timer_event, | |
1385 | ||
1386 | .reset_failed = swap_reset_failed, | |
1387 | ||
c4e2ceae | 1388 | .bus_interface = "org.freedesktop.systemd1.Swap", |
07b0b134 | 1389 | .bus_message_handler = bus_swap_message_handler, |
c4e2ceae | 1390 | .bus_invalidating_properties = bus_swap_invalidating_properties, |
07b0b134 | 1391 | |
e04aad61 | 1392 | .following = swap_following, |
6210e7fc | 1393 | .following_set = swap_following_set, |
5632e374 | 1394 | |
6e620bec | 1395 | .enumerate = swap_enumerate, |
c6918296 MS |
1396 | .shutdown = swap_shutdown, |
1397 | ||
1398 | .status_message_formats = { | |
1399 | .starting_stopping = { | |
1400 | [0] = "Activating swap %s...", | |
1401 | [1] = "Deactivating swap %s...", | |
1402 | }, | |
1403 | .finished_start_job = { | |
1404 | [JOB_DONE] = "Activated swap %s.", | |
1405 | [JOB_FAILED] = "Failed to activate swap %s.", | |
1406 | [JOB_DEPENDENCY] = "Dependency failed for %s.", | |
1407 | [JOB_TIMEOUT] = "Timed out activating swap %s.", | |
1408 | }, | |
1409 | .finished_stop_job = { | |
1410 | [JOB_DONE] = "Deactivated swap %s.", | |
1411 | [JOB_FAILED] = "Failed deactivating swap %s.", | |
1412 | [JOB_TIMEOUT] = "Timed out deactivating swap %s.", | |
1413 | }, | |
1414 | }, | |
07b0b134 | 1415 | }; |