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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 | ||
173a8d04 LP |
168 | static int swap_add_device_links(Swap *s) { |
169 | SwapParameters *p; | |
170 | ||
171 | assert(s); | |
172 | ||
173 | if (!s->what) | |
174 | return 0; | |
175 | ||
176 | if (s->from_fragment) | |
177 | p = &s->parameters_fragment; | |
173a8d04 LP |
178 | else |
179 | return 0; | |
180 | ||
cfcfd4ae LP |
181 | if (is_device_path(s->what)) |
182 | return unit_add_node_link(UNIT(s), s->what, | |
183 | !p->noauto && p->nofail && | |
67445f4e | 184 | UNIT(s)->manager->running_as == SYSTEMD_SYSTEM); |
cfcfd4ae LP |
185 | else |
186 | /* File based swap devices need to be ordered after | |
2b93b027 | 187 | * systemd-remount-fs.service, since they might need a |
cfcfd4ae | 188 | * writable file system. */ |
2b93b027 | 189 | return unit_add_dependency_by_name(UNIT(s), UNIT_AFTER, SPECIAL_REMOUNT_FS_SERVICE, NULL, true); |
173a8d04 LP |
190 | } |
191 | ||
2edd4434 LP |
192 | static int swap_add_default_dependencies(Swap *s) { |
193 | int r; | |
194 | ||
195 | assert(s); | |
196 | ||
67445f4e | 197 | if (UNIT(s)->manager->running_as != SYSTEMD_SYSTEM) |
6b1dc2bd | 198 | return 0; |
2edd4434 | 199 | |
c0387ebf LP |
200 | if (detect_container(NULL) > 0) |
201 | return 0; | |
202 | ||
6b1dc2bd LP |
203 | r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true); |
204 | if (r < 0) | |
205 | return r; | |
2edd4434 LP |
206 | |
207 | return 0; | |
208 | } | |
209 | ||
4e85aff4 LP |
210 | static int swap_verify(Swap *s) { |
211 | bool b; | |
212 | char *e; | |
213 | ||
1124fe6f | 214 | if (UNIT(s)->load_state != UNIT_LOADED) |
4e85aff4 LP |
215 | return 0; |
216 | ||
217 | if (!(e = unit_name_from_path(s->what, ".swap"))) | |
218 | return -ENOMEM; | |
219 | ||
220 | b = unit_has_name(UNIT(s), e); | |
221 | free(e); | |
222 | ||
223 | if (!b) { | |
1124fe6f | 224 | log_error("%s: Value of \"What\" and unit name do not match, not loading.\n", UNIT(s)->id); |
4e85aff4 LP |
225 | return -EINVAL; |
226 | } | |
227 | ||
4819ff03 | 228 | if (s->exec_context.pam_name && s->kill_context.kill_mode != KILL_CONTROL_GROUP) { |
1124fe6f | 229 | log_error("%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing.", UNIT(s)->id); |
e04aad61 LP |
230 | return -EINVAL; |
231 | } | |
232 | ||
4e85aff4 LP |
233 | return 0; |
234 | } | |
235 | ||
07b0b134 ML |
236 | static int swap_load(Unit *u) { |
237 | int r; | |
238 | Swap *s = SWAP(u); | |
239 | ||
240 | assert(s); | |
ac155bb8 | 241 | assert(u->load_state == UNIT_STUB); |
07b0b134 ML |
242 | |
243 | /* Load a .swap file */ | |
244 | if ((r = unit_load_fragment_and_dropin_optional(u)) < 0) | |
245 | return r; | |
246 | ||
ac155bb8 | 247 | if (u->load_state == UNIT_LOADED) { |
27abbe82 LP |
248 | if ((r = unit_add_exec_dependencies(u, &s->exec_context)) < 0) |
249 | return r; | |
4e85aff4 | 250 | |
1124fe6f | 251 | if (UNIT(s)->fragment_path) |
4e85aff4 LP |
252 | s->from_fragment = true; |
253 | ||
254 | if (!s->what) { | |
255 | if (s->parameters_fragment.what) | |
256 | s->what = strdup(s->parameters_fragment.what); | |
4e85aff4 LP |
257 | else if (s->parameters_proc_swaps.what) |
258 | s->what = strdup(s->parameters_proc_swaps.what); | |
259 | else | |
ac155bb8 | 260 | s->what = unit_name_to_path(u->id); |
4e85aff4 LP |
261 | |
262 | if (!s->what) | |
07b0b134 | 263 | return -ENOMEM; |
4e85aff4 | 264 | } |
07b0b134 ML |
265 | |
266 | path_kill_slashes(s->what); | |
267 | ||
1124fe6f | 268 | if (!UNIT(s)->description) |
4e85aff4 LP |
269 | if ((r = unit_set_description(u, s->what)) < 0) |
270 | return r; | |
271 | ||
173a8d04 | 272 | if ((r = swap_add_device_links(s)) < 0) |
07b0b134 ML |
273 | return r; |
274 | ||
6e2ef85b LP |
275 | if ((r = swap_add_mount_links(s)) < 0) |
276 | return r; | |
07b0b134 | 277 | |
d686d8a9 | 278 | if ((r = unit_add_default_cgroups(u)) < 0) |
f1a1cd64 LP |
279 | return r; |
280 | ||
1124fe6f | 281 | if (UNIT(s)->default_dependencies) |
2edd4434 LP |
282 | if ((r = swap_add_default_dependencies(s)) < 0) |
283 | return r; | |
e06c73cc | 284 | |
cba6e062 | 285 | r = unit_exec_context_defaults(u, &s->exec_context); |
e06c73cc LP |
286 | if (r < 0) |
287 | return r; | |
07b0b134 ML |
288 | } |
289 | ||
290 | return swap_verify(s); | |
291 | } | |
292 | ||
6b1dc2bd | 293 | static int swap_add_one( |
4e85aff4 LP |
294 | Manager *m, |
295 | const char *what, | |
e04aad61 | 296 | const char *what_proc_swaps, |
4e85aff4 LP |
297 | int priority, |
298 | bool noauto, | |
173a8d04 | 299 | bool nofail, |
e04aad61 LP |
300 | bool set_flags) { |
301 | ||
4e85aff4 | 302 | Unit *u = NULL; |
e04aad61 | 303 | char *e = NULL, *wp = NULL; |
2c7c6144 | 304 | bool delete = false; |
07b0b134 | 305 | int r; |
4e85aff4 | 306 | SwapParameters *p; |
6b1dc2bd | 307 | Swap *first; |
4e85aff4 LP |
308 | |
309 | assert(m); | |
310 | assert(what); | |
6b1dc2bd | 311 | assert(what_proc_swaps); |
07b0b134 | 312 | |
7d17cfbc MS |
313 | e = unit_name_from_path(what, ".swap"); |
314 | if (!e) | |
07b0b134 ML |
315 | return -ENOMEM; |
316 | ||
e04aad61 LP |
317 | u = manager_get_unit(m, e); |
318 | ||
6b1dc2bd | 319 | if (u && |
e04aad61 LP |
320 | SWAP(u)->from_proc_swaps && |
321 | !path_equal(SWAP(u)->parameters_proc_swaps.what, what_proc_swaps)) | |
322 | return -EEXIST; | |
4e85aff4 LP |
323 | |
324 | if (!u) { | |
07b0b134 ML |
325 | delete = true; |
326 | ||
7d17cfbc MS |
327 | u = unit_new(m, sizeof(Swap)); |
328 | if (!u) { | |
07b0b134 ML |
329 | free(e); |
330 | return -ENOMEM; | |
331 | } | |
e04aad61 | 332 | |
7d17cfbc MS |
333 | r = unit_add_name(u, e); |
334 | if (r < 0) | |
e04aad61 LP |
335 | goto fail; |
336 | ||
7d17cfbc MS |
337 | SWAP(u)->what = strdup(what); |
338 | if (!SWAP(u)->what) { | |
e04aad61 LP |
339 | r = -ENOMEM; |
340 | goto fail; | |
341 | } | |
342 | ||
343 | unit_add_to_load_queue(u); | |
4e85aff4 LP |
344 | } else |
345 | delete = false; | |
07b0b134 | 346 | |
6b1dc2bd | 347 | p = &SWAP(u)->parameters_proc_swaps; |
07b0b134 | 348 | |
6b1dc2bd LP |
349 | if (!p->what) { |
350 | if (!(wp = strdup(what_proc_swaps))) { | |
351 | r = -ENOMEM; | |
352 | goto fail; | |
353 | } | |
e04aad61 | 354 | |
6b1dc2bd LP |
355 | if (!m->swaps_by_proc_swaps) |
356 | if (!(m->swaps_by_proc_swaps = hashmap_new(string_hash_func, string_compare_func))) { | |
e04aad61 LP |
357 | r = -ENOMEM; |
358 | goto fail; | |
359 | } | |
360 | ||
6b1dc2bd LP |
361 | free(p->what); |
362 | p->what = wp; | |
e04aad61 | 363 | |
6b1dc2bd LP |
364 | first = hashmap_get(m->swaps_by_proc_swaps, wp); |
365 | LIST_PREPEND(Swap, same_proc_swaps, first, SWAP(u)); | |
e04aad61 | 366 | |
6b1dc2bd | 367 | if ((r = hashmap_replace(m->swaps_by_proc_swaps, wp, first)) < 0) |
e04aad61 | 368 | goto fail; |
6b1dc2bd | 369 | } |
e04aad61 | 370 | |
6b1dc2bd LP |
371 | if (set_flags) { |
372 | SWAP(u)->is_active = true; | |
373 | SWAP(u)->just_activated = !SWAP(u)->from_proc_swaps; | |
4e85aff4 | 374 | } |
07b0b134 | 375 | |
6b1dc2bd LP |
376 | SWAP(u)->from_proc_swaps = true; |
377 | ||
4e85aff4 LP |
378 | p->priority = priority; |
379 | p->noauto = noauto; | |
173a8d04 | 380 | p->nofail = nofail; |
07b0b134 | 381 | |
4e85aff4 | 382 | unit_add_to_dbus_queue(u); |
07b0b134 | 383 | |
4e85aff4 | 384 | free(e); |
07b0b134 ML |
385 | |
386 | return 0; | |
387 | ||
388 | fail: | |
e04aad61 LP |
389 | log_warning("Failed to load swap unit: %s", strerror(-r)); |
390 | ||
391 | free(wp); | |
4e85aff4 LP |
392 | free(e); |
393 | ||
394 | if (delete && u) | |
07b0b134 ML |
395 | unit_free(u); |
396 | ||
4e85aff4 | 397 | return r; |
07b0b134 ML |
398 | } |
399 | ||
e04aad61 LP |
400 | static int swap_process_new_swap(Manager *m, const char *device, int prio, bool set_flags) { |
401 | struct stat st; | |
402 | int r = 0, k; | |
403 | ||
404 | assert(m); | |
405 | ||
406 | if (stat(device, &st) >= 0 && S_ISBLK(st.st_mode)) { | |
407 | struct udev_device *d; | |
408 | const char *dn; | |
409 | struct udev_list_entry *item = NULL, *first = NULL; | |
410 | ||
411 | /* So this is a proper swap device. Create swap units | |
412 | * for all names this swap device is known under */ | |
413 | ||
414 | if (!(d = udev_device_new_from_devnum(m->udev, 'b', st.st_rdev))) | |
415 | return -ENOMEM; | |
416 | ||
8d8e9456 LP |
417 | dn = udev_device_get_devnode(d); |
418 | if (dn) | |
419 | r = swap_add_one(m, dn, device, prio, false, false, set_flags); | |
e04aad61 LP |
420 | |
421 | /* Add additional units for all symlinks */ | |
422 | first = udev_device_get_devlinks_list_entry(d); | |
423 | udev_list_entry_foreach(item, first) { | |
424 | const char *p; | |
425 | ||
426 | /* Don't bother with the /dev/block links */ | |
427 | p = udev_list_entry_get_name(item); | |
428 | ||
429 | if (path_startswith(p, "/dev/block/")) | |
430 | continue; | |
431 | ||
432 | if (stat(p, &st) >= 0) | |
433 | if ((!S_ISBLK(st.st_mode)) || st.st_rdev != udev_device_get_devnum(d)) | |
434 | continue; | |
435 | ||
8d8e9456 LP |
436 | k = swap_add_one(m, p, device, prio, false, false, set_flags); |
437 | if (k < 0) | |
e04aad61 LP |
438 | r = k; |
439 | } | |
440 | ||
441 | udev_device_unref(d); | |
442 | } | |
443 | ||
8d8e9456 LP |
444 | k = swap_add_one(m, device, device, prio, false, false, set_flags); |
445 | if (k < 0) | |
e04aad61 LP |
446 | r = k; |
447 | ||
448 | return r; | |
449 | } | |
450 | ||
07b0b134 ML |
451 | static void swap_set_state(Swap *s, SwapState state) { |
452 | SwapState old_state; | |
e04aad61 | 453 | |
07b0b134 ML |
454 | assert(s); |
455 | ||
456 | old_state = s->state; | |
457 | s->state = state; | |
458 | ||
e04aad61 LP |
459 | if (state != SWAP_ACTIVATING && |
460 | state != SWAP_ACTIVATING_SIGTERM && | |
461 | state != SWAP_ACTIVATING_SIGKILL && | |
462 | state != SWAP_DEACTIVATING && | |
463 | state != SWAP_DEACTIVATING_SIGTERM && | |
464 | state != SWAP_DEACTIVATING_SIGKILL) { | |
465 | unit_unwatch_timer(UNIT(s), &s->timer_watch); | |
466 | swap_unwatch_control_pid(s); | |
467 | s->control_command = NULL; | |
468 | s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; | |
469 | } | |
470 | ||
07b0b134 ML |
471 | if (state != old_state) |
472 | log_debug("%s changed %s -> %s", | |
1124fe6f | 473 | UNIT(s)->id, |
07b0b134 ML |
474 | swap_state_to_string(old_state), |
475 | swap_state_to_string(state)); | |
476 | ||
e2f3b44c | 477 | unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], true); |
07b0b134 ML |
478 | } |
479 | ||
480 | static int swap_coldplug(Unit *u) { | |
481 | Swap *s = SWAP(u); | |
482 | SwapState new_state = SWAP_DEAD; | |
e04aad61 | 483 | int r; |
07b0b134 ML |
484 | |
485 | assert(s); | |
486 | assert(s->state == SWAP_DEAD); | |
487 | ||
488 | if (s->deserialized_state != s->state) | |
489 | new_state = s->deserialized_state; | |
4e85aff4 | 490 | else if (s->from_proc_swaps) |
07b0b134 ML |
491 | new_state = SWAP_ACTIVE; |
492 | ||
e04aad61 LP |
493 | if (new_state != s->state) { |
494 | ||
495 | if (new_state == SWAP_ACTIVATING || | |
496 | new_state == SWAP_ACTIVATING_SIGTERM || | |
497 | new_state == SWAP_ACTIVATING_SIGKILL || | |
498 | new_state == SWAP_DEACTIVATING || | |
499 | new_state == SWAP_DEACTIVATING_SIGTERM || | |
500 | new_state == SWAP_DEACTIVATING_SIGKILL) { | |
501 | ||
502 | if (s->control_pid <= 0) | |
503 | return -EBADMSG; | |
504 | ||
505 | if ((r = unit_watch_pid(UNIT(s), s->control_pid)) < 0) | |
506 | return r; | |
507 | ||
508 | if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0) | |
509 | return r; | |
510 | } | |
511 | ||
4e85aff4 | 512 | swap_set_state(s, new_state); |
e04aad61 | 513 | } |
07b0b134 ML |
514 | |
515 | return 0; | |
516 | } | |
517 | ||
518 | static void swap_dump(Unit *u, FILE *f, const char *prefix) { | |
519 | Swap *s = SWAP(u); | |
4e85aff4 | 520 | SwapParameters *p; |
07b0b134 ML |
521 | |
522 | assert(s); | |
4e85aff4 LP |
523 | assert(f); |
524 | ||
525 | if (s->from_proc_swaps) | |
526 | p = &s->parameters_proc_swaps; | |
527 | else if (s->from_fragment) | |
528 | p = &s->parameters_fragment; | |
b6bfc7bb LP |
529 | else |
530 | p = NULL; | |
07b0b134 ML |
531 | |
532 | fprintf(f, | |
4e85aff4 | 533 | "%sSwap State: %s\n" |
e1770af8 | 534 | "%sResult: %s\n" |
07b0b134 | 535 | "%sWhat: %s\n" |
4e85aff4 LP |
536 | "%sFrom /proc/swaps: %s\n" |
537 | "%sFrom fragment: %s\n", | |
07b0b134 | 538 | prefix, swap_state_to_string(s->state), |
e1770af8 | 539 | prefix, swap_result_to_string(s->result), |
07b0b134 | 540 | prefix, s->what, |
4e85aff4 LP |
541 | prefix, yes_no(s->from_proc_swaps), |
542 | prefix, yes_no(s->from_fragment)); | |
e04aad61 | 543 | |
b6bfc7bb LP |
544 | if (p) |
545 | fprintf(f, | |
546 | "%sPriority: %i\n" | |
547 | "%sNoAuto: %s\n" | |
548 | "%sNoFail: %s\n", | |
549 | prefix, p->priority, | |
550 | prefix, yes_no(p->noauto), | |
551 | prefix, yes_no(p->nofail)); | |
552 | ||
e04aad61 LP |
553 | if (s->control_pid > 0) |
554 | fprintf(f, | |
555 | "%sControl PID: %lu\n", | |
556 | prefix, (unsigned long) s->control_pid); | |
557 | ||
558 | exec_context_dump(&s->exec_context, f, prefix); | |
4819ff03 | 559 | kill_context_dump(&s->kill_context, f, prefix); |
e04aad61 LP |
560 | } |
561 | ||
562 | static int swap_spawn(Swap *s, ExecCommand *c, pid_t *_pid) { | |
563 | pid_t pid; | |
564 | int r; | |
565 | ||
566 | assert(s); | |
567 | assert(c); | |
568 | assert(_pid); | |
569 | ||
570 | if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0) | |
571 | goto fail; | |
572 | ||
573 | if ((r = exec_spawn(c, | |
574 | NULL, | |
575 | &s->exec_context, | |
576 | NULL, 0, | |
1124fe6f | 577 | UNIT(s)->manager->environment, |
e04aad61 LP |
578 | true, |
579 | true, | |
580 | true, | |
1124fe6f MS |
581 | UNIT(s)->manager->confirm_spawn, |
582 | UNIT(s)->cgroup_bondings, | |
583 | UNIT(s)->cgroup_attributes, | |
ecedd90f | 584 | NULL, |
62bca2c6 | 585 | UNIT(s)->id, |
f2b68789 | 586 | NULL, |
e04aad61 LP |
587 | &pid)) < 0) |
588 | goto fail; | |
589 | ||
590 | if ((r = unit_watch_pid(UNIT(s), pid)) < 0) | |
591 | /* FIXME: we need to do something here */ | |
592 | goto fail; | |
593 | ||
594 | *_pid = pid; | |
595 | ||
596 | return 0; | |
597 | ||
598 | fail: | |
599 | unit_unwatch_timer(UNIT(s), &s->timer_watch); | |
600 | ||
601 | return r; | |
07b0b134 ML |
602 | } |
603 | ||
e1770af8 | 604 | static void swap_enter_dead(Swap *s, SwapResult f) { |
07b0b134 ML |
605 | assert(s); |
606 | ||
e1770af8 LP |
607 | if (f != SWAP_SUCCESS) |
608 | s->result = f; | |
e04aad61 | 609 | |
e1770af8 | 610 | swap_set_state(s, s->result != SWAP_SUCCESS ? SWAP_FAILED : SWAP_DEAD); |
07b0b134 ML |
611 | } |
612 | ||
e1770af8 | 613 | static void swap_enter_active(Swap *s, SwapResult f) { |
e04aad61 LP |
614 | assert(s); |
615 | ||
e1770af8 LP |
616 | if (f != SWAP_SUCCESS) |
617 | s->result = f; | |
e04aad61 LP |
618 | |
619 | swap_set_state(s, SWAP_ACTIVE); | |
620 | } | |
621 | ||
e1770af8 | 622 | static void swap_enter_signal(Swap *s, SwapState state, SwapResult f) { |
07b0b134 | 623 | int r; |
e04aad61 LP |
624 | Set *pid_set = NULL; |
625 | bool wait_for_exit = false; | |
07b0b134 ML |
626 | |
627 | assert(s); | |
e04aad61 | 628 | |
e1770af8 LP |
629 | if (f != SWAP_SUCCESS) |
630 | s->result = f; | |
e04aad61 | 631 | |
4819ff03 | 632 | if (s->kill_context.kill_mode != KILL_NONE) { |
e04aad61 | 633 | int sig = (state == SWAP_ACTIVATING_SIGTERM || |
4819ff03 | 634 | state == SWAP_DEACTIVATING_SIGTERM) ? s->kill_context.kill_signal : SIGKILL; |
e04aad61 LP |
635 | |
636 | if (s->control_pid > 0) { | |
cd25cce9 | 637 | if (kill_and_sigcont(s->control_pid, sig) < 0 && errno != ESRCH) |
e04aad61 LP |
638 | |
639 | log_warning("Failed to kill control process %li: %m", (long) s->control_pid); | |
640 | else | |
641 | wait_for_exit = true; | |
642 | } | |
643 | ||
4819ff03 | 644 | if (s->kill_context.kill_mode == KILL_CONTROL_GROUP) { |
e04aad61 LP |
645 | |
646 | if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func))) { | |
647 | r = -ENOMEM; | |
648 | goto fail; | |
649 | } | |
650 | ||
651 | /* Exclude the control pid from being killed via the cgroup */ | |
652 | if (s->control_pid > 0) | |
653 | if ((r = set_put(pid_set, LONG_TO_PTR(s->control_pid))) < 0) | |
654 | goto fail; | |
655 | ||
88f3e0c9 | 656 | r = cgroup_bonding_kill_list(UNIT(s)->cgroup_bondings, sig, true, false, pid_set, NULL); |
ecedd90f | 657 | if (r < 0) { |
e04aad61 LP |
658 | if (r != -EAGAIN && r != -ESRCH && r != -ENOENT) |
659 | log_warning("Failed to kill control group: %s", strerror(-r)); | |
660 | } else if (r > 0) | |
661 | wait_for_exit = true; | |
662 | ||
663 | set_free(pid_set); | |
da19d5c1 | 664 | pid_set = NULL; |
e04aad61 LP |
665 | } |
666 | } | |
667 | ||
668 | if (wait_for_exit) { | |
669 | if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0) | |
670 | goto fail; | |
671 | ||
672 | swap_set_state(s, state); | |
673 | } else | |
e1770af8 | 674 | swap_enter_dead(s, SWAP_SUCCESS); |
e04aad61 LP |
675 | |
676 | return; | |
677 | ||
678 | fail: | |
1124fe6f | 679 | log_warning("%s failed to kill processes: %s", UNIT(s)->id, strerror(-r)); |
e04aad61 | 680 | |
e1770af8 | 681 | swap_enter_dead(s, SWAP_FAILURE_RESOURCES); |
e04aad61 LP |
682 | |
683 | if (pid_set) | |
684 | set_free(pid_set); | |
685 | } | |
686 | ||
687 | static void swap_enter_activating(Swap *s) { | |
688 | int r, priority; | |
689 | ||
690 | assert(s); | |
691 | ||
692 | s->control_command_id = SWAP_EXEC_ACTIVATE; | |
693 | s->control_command = s->exec_command + SWAP_EXEC_ACTIVATE; | |
07b0b134 | 694 | |
4e85aff4 LP |
695 | if (s->from_fragment) |
696 | priority = s->parameters_fragment.priority; | |
e04aad61 LP |
697 | else |
698 | priority = -1; | |
4e85aff4 | 699 | |
e04aad61 LP |
700 | if (priority >= 0) { |
701 | char p[LINE_MAX]; | |
07b0b134 | 702 | |
e04aad61 LP |
703 | snprintf(p, sizeof(p), "%i", priority); |
704 | char_array_0(p); | |
07b0b134 | 705 | |
e04aad61 LP |
706 | r = exec_command_set( |
707 | s->control_command, | |
708 | "/sbin/swapon", | |
709 | "-p", | |
710 | p, | |
711 | s->what, | |
712 | NULL); | |
713 | } else | |
714 | r = exec_command_set( | |
715 | s->control_command, | |
716 | "/sbin/swapon", | |
717 | s->what, | |
718 | NULL); | |
719 | ||
720 | if (r < 0) | |
721 | goto fail; | |
722 | ||
723 | swap_unwatch_control_pid(s); | |
724 | ||
725 | if ((r = swap_spawn(s, s->control_command, &s->control_pid)) < 0) | |
726 | goto fail; | |
727 | ||
728 | swap_set_state(s, SWAP_ACTIVATING); | |
729 | ||
730 | return; | |
731 | ||
732 | fail: | |
1124fe6f | 733 | log_warning("%s failed to run 'swapon' task: %s", UNIT(s)->id, strerror(-r)); |
e1770af8 | 734 | swap_enter_dead(s, SWAP_FAILURE_RESOURCES); |
e04aad61 LP |
735 | } |
736 | ||
e1770af8 | 737 | static void swap_enter_deactivating(Swap *s) { |
e04aad61 LP |
738 | int r; |
739 | ||
740 | assert(s); | |
741 | ||
e04aad61 LP |
742 | s->control_command_id = SWAP_EXEC_DEACTIVATE; |
743 | s->control_command = s->exec_command + SWAP_EXEC_DEACTIVATE; | |
744 | ||
745 | if ((r = exec_command_set( | |
746 | s->control_command, | |
747 | "/sbin/swapoff", | |
748 | s->what, | |
749 | NULL)) < 0) | |
750 | goto fail; | |
751 | ||
752 | swap_unwatch_control_pid(s); | |
753 | ||
754 | if ((r = swap_spawn(s, s->control_command, &s->control_pid)) < 0) | |
755 | goto fail; | |
756 | ||
757 | swap_set_state(s, SWAP_DEACTIVATING); | |
758 | ||
759 | return; | |
760 | ||
761 | fail: | |
1124fe6f | 762 | log_warning("%s failed to run 'swapoff' task: %s", UNIT(s)->id, strerror(-r)); |
e1770af8 | 763 | swap_enter_active(s, SWAP_FAILURE_RESOURCES); |
e04aad61 LP |
764 | } |
765 | ||
766 | static int swap_start(Unit *u) { | |
767 | Swap *s = SWAP(u); | |
768 | ||
769 | assert(s); | |
770 | ||
771 | /* We cannot fulfill this request right now, try again later | |
772 | * please! */ | |
773 | ||
774 | if (s->state == SWAP_DEACTIVATING || | |
775 | s->state == SWAP_DEACTIVATING_SIGTERM || | |
776 | s->state == SWAP_DEACTIVATING_SIGKILL || | |
777 | s->state == SWAP_ACTIVATING_SIGTERM || | |
778 | s->state == SWAP_ACTIVATING_SIGKILL) | |
779 | return -EAGAIN; | |
780 | ||
781 | if (s->state == SWAP_ACTIVATING) | |
782 | return 0; | |
783 | ||
784 | assert(s->state == SWAP_DEAD || s->state == SWAP_FAILED); | |
785 | ||
a5c3034f LP |
786 | if (detect_container(NULL) > 0) |
787 | return -EPERM; | |
788 | ||
e1770af8 | 789 | s->result = SWAP_SUCCESS; |
e04aad61 | 790 | swap_enter_activating(s); |
07b0b134 ML |
791 | return 0; |
792 | } | |
793 | ||
794 | static int swap_stop(Unit *u) { | |
795 | Swap *s = SWAP(u); | |
07b0b134 ML |
796 | |
797 | assert(s); | |
798 | ||
e04aad61 LP |
799 | if (s->state == SWAP_DEACTIVATING || |
800 | s->state == SWAP_DEACTIVATING_SIGTERM || | |
801 | s->state == SWAP_DEACTIVATING_SIGKILL || | |
802 | s->state == SWAP_ACTIVATING_SIGTERM || | |
803 | s->state == SWAP_ACTIVATING_SIGKILL) | |
804 | return 0; | |
07b0b134 | 805 | |
e04aad61 LP |
806 | assert(s->state == SWAP_ACTIVATING || |
807 | s->state == SWAP_ACTIVE); | |
07b0b134 | 808 | |
a5c3034f LP |
809 | if (detect_container(NULL) > 0) |
810 | return -EPERM; | |
811 | ||
e1770af8 | 812 | swap_enter_deactivating(s); |
07b0b134 ML |
813 | return 0; |
814 | } | |
815 | ||
816 | static int swap_serialize(Unit *u, FILE *f, FDSet *fds) { | |
817 | Swap *s = SWAP(u); | |
818 | ||
819 | assert(s); | |
820 | assert(f); | |
821 | assert(fds); | |
822 | ||
823 | unit_serialize_item(u, f, "state", swap_state_to_string(s->state)); | |
e1770af8 | 824 | unit_serialize_item(u, f, "result", swap_result_to_string(s->result)); |
e04aad61 LP |
825 | |
826 | if (s->control_pid > 0) | |
827 | unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) s->control_pid); | |
828 | ||
829 | if (s->control_command_id >= 0) | |
830 | unit_serialize_item(u, f, "control-command", swap_exec_command_to_string(s->control_command_id)); | |
07b0b134 ML |
831 | |
832 | return 0; | |
833 | } | |
834 | ||
835 | static int swap_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
836 | Swap *s = SWAP(u); | |
837 | ||
838 | assert(s); | |
839 | assert(fds); | |
840 | ||
841 | if (streq(key, "state")) { | |
842 | SwapState state; | |
843 | ||
844 | if ((state = swap_state_from_string(value)) < 0) | |
845 | log_debug("Failed to parse state value %s", value); | |
846 | else | |
847 | s->deserialized_state = state; | |
e1770af8 LP |
848 | } else if (streq(key, "result")) { |
849 | SwapResult f; | |
850 | ||
851 | f = swap_result_from_string(value); | |
852 | if (f < 0) | |
853 | log_debug("Failed to parse result value %s", value); | |
854 | else if (f != SWAP_SUCCESS) | |
855 | s->result = f; | |
e04aad61 LP |
856 | } else if (streq(key, "control-pid")) { |
857 | pid_t pid; | |
858 | ||
859 | if (parse_pid(value, &pid) < 0) | |
860 | log_debug("Failed to parse control-pid value %s", value); | |
861 | else | |
862 | s->control_pid = pid; | |
863 | ||
864 | } else if (streq(key, "control-command")) { | |
865 | SwapExecCommand id; | |
866 | ||
867 | if ((id = swap_exec_command_from_string(value)) < 0) | |
868 | log_debug("Failed to parse exec-command value %s", value); | |
869 | else { | |
870 | s->control_command_id = id; | |
871 | s->control_command = s->exec_command + id; | |
872 | } | |
873 | ||
07b0b134 ML |
874 | } else |
875 | log_debug("Unknown serialization key '%s'", key); | |
876 | ||
877 | return 0; | |
878 | } | |
879 | ||
880 | static UnitActiveState swap_active_state(Unit *u) { | |
881 | assert(u); | |
882 | ||
883 | return state_translation_table[SWAP(u)->state]; | |
884 | } | |
885 | ||
886 | static const char *swap_sub_state_to_string(Unit *u) { | |
887 | assert(u); | |
888 | ||
889 | return swap_state_to_string(SWAP(u)->state); | |
890 | } | |
891 | ||
892 | static bool swap_check_gc(Unit *u) { | |
893 | Swap *s = SWAP(u); | |
894 | ||
895 | assert(s); | |
896 | ||
6b1dc2bd | 897 | return s->from_proc_swaps; |
07b0b134 ML |
898 | } |
899 | ||
e04aad61 LP |
900 | static void swap_sigchld_event(Unit *u, pid_t pid, int code, int status) { |
901 | Swap *s = SWAP(u); | |
e1770af8 | 902 | SwapResult f; |
e04aad61 LP |
903 | |
904 | assert(s); | |
905 | assert(pid >= 0); | |
906 | ||
907 | if (pid != s->control_pid) | |
908 | return; | |
909 | ||
910 | s->control_pid = 0; | |
911 | ||
96342de6 | 912 | if (is_clean_exit(code, status, NULL)) |
e1770af8 LP |
913 | f = SWAP_SUCCESS; |
914 | else if (code == CLD_EXITED) | |
915 | f = SWAP_FAILURE_EXIT_CODE; | |
916 | else if (code == CLD_KILLED) | |
917 | f = SWAP_FAILURE_SIGNAL; | |
918 | else if (code == CLD_DUMPED) | |
919 | f = SWAP_FAILURE_CORE_DUMP; | |
920 | else | |
921 | assert_not_reached("Unknown code"); | |
922 | ||
923 | if (f != SWAP_SUCCESS) | |
924 | s->result = f; | |
e04aad61 LP |
925 | |
926 | if (s->control_command) { | |
6ea832a2 | 927 | exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status); |
e1770af8 | 928 | |
e04aad61 LP |
929 | s->control_command = NULL; |
930 | s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; | |
931 | } | |
932 | ||
e1770af8 | 933 | log_full(f == SWAP_SUCCESS ? LOG_DEBUG : LOG_NOTICE, |
ac155bb8 | 934 | "%s swap process exited, code=%s status=%i", u->id, sigchld_code_to_string(code), status); |
e04aad61 LP |
935 | |
936 | switch (s->state) { | |
937 | ||
938 | case SWAP_ACTIVATING: | |
939 | case SWAP_ACTIVATING_SIGTERM: | |
940 | case SWAP_ACTIVATING_SIGKILL: | |
941 | ||
e1770af8 LP |
942 | if (f == SWAP_SUCCESS) |
943 | swap_enter_active(s, f); | |
e04aad61 | 944 | else |
e1770af8 | 945 | swap_enter_dead(s, f); |
e04aad61 LP |
946 | break; |
947 | ||
948 | case SWAP_DEACTIVATING: | |
949 | case SWAP_DEACTIVATING_SIGKILL: | |
950 | case SWAP_DEACTIVATING_SIGTERM: | |
951 | ||
e1770af8 LP |
952 | if (f == SWAP_SUCCESS) |
953 | swap_enter_dead(s, f); | |
e04aad61 | 954 | else |
e1770af8 | 955 | swap_enter_dead(s, f); |
e04aad61 LP |
956 | break; |
957 | ||
958 | default: | |
959 | assert_not_reached("Uh, control process died at wrong time."); | |
960 | } | |
961 | ||
962 | /* Notify clients about changed exit status */ | |
963 | unit_add_to_dbus_queue(u); | |
964 | ||
965 | /* Request a reload of /proc/swaps, so that following units | |
966 | * can follow our state change */ | |
ac155bb8 | 967 | u->manager->request_reload = true; |
e04aad61 LP |
968 | } |
969 | ||
970 | static void swap_timer_event(Unit *u, uint64_t elapsed, Watch *w) { | |
971 | Swap *s = SWAP(u); | |
972 | ||
973 | assert(s); | |
974 | assert(elapsed == 1); | |
975 | assert(w == &s->timer_watch); | |
976 | ||
977 | switch (s->state) { | |
978 | ||
979 | case SWAP_ACTIVATING: | |
ac155bb8 | 980 | log_warning("%s activation timed out. Stopping.", u->id); |
e1770af8 | 981 | swap_enter_signal(s, SWAP_ACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT); |
e04aad61 LP |
982 | break; |
983 | ||
984 | case SWAP_DEACTIVATING: | |
ac155bb8 | 985 | log_warning("%s deactivation timed out. Stopping.", u->id); |
e1770af8 | 986 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT); |
e04aad61 LP |
987 | break; |
988 | ||
989 | case SWAP_ACTIVATING_SIGTERM: | |
4819ff03 | 990 | if (s->kill_context.send_sigkill) { |
ac155bb8 | 991 | log_warning("%s activation timed out. Killing.", u->id); |
e1770af8 | 992 | swap_enter_signal(s, SWAP_ACTIVATING_SIGKILL, SWAP_FAILURE_TIMEOUT); |
ba035df2 | 993 | } else { |
ac155bb8 | 994 | log_warning("%s activation timed out. Skipping SIGKILL. Ignoring.", u->id); |
e1770af8 | 995 | swap_enter_dead(s, SWAP_FAILURE_TIMEOUT); |
ba035df2 | 996 | } |
e04aad61 LP |
997 | break; |
998 | ||
999 | case SWAP_DEACTIVATING_SIGTERM: | |
4819ff03 | 1000 | if (s->kill_context.send_sigkill) { |
ac155bb8 | 1001 | log_warning("%s deactivation timed out. Killing.", u->id); |
e1770af8 | 1002 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, SWAP_FAILURE_TIMEOUT); |
ba035df2 | 1003 | } else { |
ac155bb8 | 1004 | log_warning("%s deactivation timed out. Skipping SIGKILL. Ignoring.", u->id); |
e1770af8 | 1005 | swap_enter_dead(s, SWAP_FAILURE_TIMEOUT); |
ba035df2 | 1006 | } |
e04aad61 LP |
1007 | break; |
1008 | ||
1009 | case SWAP_ACTIVATING_SIGKILL: | |
1010 | case SWAP_DEACTIVATING_SIGKILL: | |
ac155bb8 | 1011 | log_warning("%s swap process still around after SIGKILL. Ignoring.", u->id); |
e1770af8 | 1012 | swap_enter_dead(s, SWAP_FAILURE_TIMEOUT); |
e04aad61 LP |
1013 | break; |
1014 | ||
1015 | default: | |
1016 | assert_not_reached("Timeout at wrong time."); | |
1017 | } | |
1018 | } | |
1019 | ||
1020 | static int swap_load_proc_swaps(Manager *m, bool set_flags) { | |
1021 | unsigned i; | |
1022 | int r = 0; | |
1023 | ||
1024 | assert(m); | |
1025 | ||
07b0b134 | 1026 | rewind(m->proc_swaps); |
bab45044 | 1027 | |
4e85aff4 | 1028 | (void) fscanf(m->proc_swaps, "%*s %*s %*s %*s %*s\n"); |
07b0b134 | 1029 | |
e04aad61 | 1030 | for (i = 1;; i++) { |
07b0b134 ML |
1031 | char *dev = NULL, *d; |
1032 | int prio = 0, k; | |
1033 | ||
4e85aff4 | 1034 | if ((k = fscanf(m->proc_swaps, |
e04aad61 LP |
1035 | "%ms " /* device/file */ |
1036 | "%*s " /* type of swap */ | |
1037 | "%*s " /* swap size */ | |
1038 | "%*s " /* used */ | |
4e85aff4 LP |
1039 | "%i\n", /* priority */ |
1040 | &dev, &prio)) != 2) { | |
07b0b134 | 1041 | |
07b0b134 | 1042 | if (k == EOF) |
4e85aff4 | 1043 | break; |
07b0b134 | 1044 | |
e04aad61 | 1045 | log_warning("Failed to parse /proc/swaps:%u.", i); |
07b0b134 | 1046 | free(dev); |
e04aad61 | 1047 | continue; |
07b0b134 | 1048 | } |
07b0b134 | 1049 | |
4e85aff4 | 1050 | d = cunescape(dev); |
07b0b134 | 1051 | free(dev); |
4e85aff4 LP |
1052 | |
1053 | if (!d) | |
1054 | return -ENOMEM; | |
1055 | ||
e04aad61 | 1056 | k = swap_process_new_swap(m, d, prio, set_flags); |
07b0b134 ML |
1057 | free(d); |
1058 | ||
1059 | if (k < 0) | |
e04aad61 | 1060 | r = k; |
07b0b134 ML |
1061 | } |
1062 | ||
e04aad61 LP |
1063 | return r; |
1064 | } | |
1065 | ||
1066 | int swap_dispatch_reload(Manager *m) { | |
4e434314 | 1067 | /* This function should go as soon as the kernel properly notifies us */ |
e04aad61 LP |
1068 | |
1069 | if (_likely_(!m->request_reload)) | |
1070 | return 0; | |
1071 | ||
1072 | m->request_reload = false; | |
1073 | ||
4e434314 LP |
1074 | return swap_fd_event(m, EPOLLPRI); |
1075 | } | |
1076 | ||
1077 | int swap_fd_event(Manager *m, int events) { | |
595ed347 | 1078 | Unit *u; |
4e434314 LP |
1079 | int r; |
1080 | ||
1081 | assert(m); | |
1082 | assert(events & EPOLLPRI); | |
1083 | ||
bd40a2d8 | 1084 | if ((r = swap_load_proc_swaps(m, true)) < 0) { |
e04aad61 LP |
1085 | log_error("Failed to reread /proc/swaps: %s", strerror(-r)); |
1086 | ||
1087 | /* Reset flags, just in case, for late calls */ | |
595ed347 MS |
1088 | LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) { |
1089 | Swap *swap = SWAP(u); | |
e04aad61 LP |
1090 | |
1091 | swap->is_active = swap->just_activated = false; | |
1092 | } | |
1093 | ||
1094 | return 0; | |
1095 | } | |
1096 | ||
1097 | manager_dispatch_load_queue(m); | |
1098 | ||
595ed347 MS |
1099 | LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) { |
1100 | Swap *swap = SWAP(u); | |
e04aad61 LP |
1101 | |
1102 | if (!swap->is_active) { | |
1103 | /* This has just been deactivated */ | |
1104 | ||
1105 | swap->from_proc_swaps = false; | |
1106 | swap_unset_proc_swaps(swap); | |
1107 | ||
1108 | switch (swap->state) { | |
1109 | ||
1110 | case SWAP_ACTIVE: | |
e1770af8 | 1111 | swap_enter_dead(swap, SWAP_SUCCESS); |
e04aad61 LP |
1112 | break; |
1113 | ||
1114 | default: | |
1115 | swap_set_state(swap, swap->state); | |
1116 | break; | |
1117 | } | |
1118 | ||
1119 | } else if (swap->just_activated) { | |
1120 | ||
1121 | /* New swap entry */ | |
1122 | ||
1123 | switch (swap->state) { | |
1124 | ||
1125 | case SWAP_DEAD: | |
1126 | case SWAP_FAILED: | |
e1770af8 | 1127 | swap_enter_active(swap, SWAP_SUCCESS); |
e04aad61 LP |
1128 | break; |
1129 | ||
1130 | default: | |
1131 | /* Nothing really changed, but let's | |
1132 | * issue an notification call | |
1133 | * nonetheless, in case somebody is | |
1134 | * waiting for this. */ | |
1135 | swap_set_state(swap, swap->state); | |
1136 | break; | |
1137 | } | |
1138 | } | |
1139 | ||
1140 | /* Reset the flags for later calls */ | |
1141 | swap->is_active = swap->just_activated = false; | |
1142 | } | |
1143 | ||
1144 | return 1; | |
1145 | } | |
1146 | ||
1147 | static Unit *swap_following(Unit *u) { | |
1148 | Swap *s = SWAP(u); | |
1149 | Swap *other, *first = NULL; | |
1150 | ||
1151 | assert(s); | |
1152 | ||
1153 | if (streq_ptr(s->what, s->parameters_proc_swaps.what)) | |
1154 | return NULL; | |
1155 | ||
1156 | /* Make everybody follow the unit that's named after the swap | |
1157 | * device in the kernel */ | |
1158 | ||
1159 | LIST_FOREACH_AFTER(same_proc_swaps, other, s) | |
1160 | if (streq_ptr(other->what, other->parameters_proc_swaps.what)) | |
1161 | return UNIT(other); | |
1162 | ||
1163 | LIST_FOREACH_BEFORE(same_proc_swaps, other, s) { | |
1164 | if (streq_ptr(other->what, other->parameters_proc_swaps.what)) | |
1165 | return UNIT(other); | |
1166 | ||
1167 | first = other; | |
1168 | } | |
1169 | ||
1170 | return UNIT(first); | |
07b0b134 ML |
1171 | } |
1172 | ||
6210e7fc LP |
1173 | static int swap_following_set(Unit *u, Set **_set) { |
1174 | Swap *s = SWAP(u); | |
1175 | Swap *other; | |
1176 | Set *set; | |
1177 | int r; | |
1178 | ||
1179 | assert(s); | |
1180 | assert(_set); | |
1181 | ||
1182 | if (LIST_JUST_US(same_proc_swaps, s)) { | |
1183 | *_set = NULL; | |
1184 | return 0; | |
1185 | } | |
1186 | ||
1187 | if (!(set = set_new(NULL, NULL))) | |
1188 | return -ENOMEM; | |
1189 | ||
1190 | LIST_FOREACH_AFTER(same_proc_swaps, other, s) | |
1191 | if ((r = set_put(set, other)) < 0) | |
1192 | goto fail; | |
1193 | ||
1194 | LIST_FOREACH_BEFORE(same_proc_swaps, other, s) | |
1195 | if ((r = set_put(set, other)) < 0) | |
1196 | goto fail; | |
1197 | ||
1198 | *_set = set; | |
1199 | return 1; | |
1200 | ||
1201 | fail: | |
1202 | set_free(set); | |
1203 | return r; | |
1204 | } | |
1205 | ||
07b0b134 ML |
1206 | static void swap_shutdown(Manager *m) { |
1207 | assert(m); | |
1208 | ||
1209 | if (m->proc_swaps) { | |
1210 | fclose(m->proc_swaps); | |
1211 | m->proc_swaps = NULL; | |
1212 | } | |
e04aad61 LP |
1213 | |
1214 | hashmap_free(m->swaps_by_proc_swaps); | |
1215 | m->swaps_by_proc_swaps = NULL; | |
07b0b134 ML |
1216 | } |
1217 | ||
07b0b134 ML |
1218 | static int swap_enumerate(Manager *m) { |
1219 | int r; | |
4e434314 | 1220 | struct epoll_event ev; |
07b0b134 ML |
1221 | assert(m); |
1222 | ||
4e434314 | 1223 | if (!m->proc_swaps) { |
4e85aff4 | 1224 | if (!(m->proc_swaps = fopen("/proc/swaps", "re"))) |
3f858732 | 1225 | return (errno == ENOENT) ? 0 : -errno; |
07b0b134 | 1226 | |
4e434314 LP |
1227 | m->swap_watch.type = WATCH_SWAP; |
1228 | m->swap_watch.fd = fileno(m->proc_swaps); | |
1229 | ||
1230 | zero(ev); | |
1231 | ev.events = EPOLLPRI; | |
1232 | ev.data.ptr = &m->swap_watch; | |
1233 | ||
1234 | if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->swap_watch.fd, &ev) < 0) | |
1235 | return -errno; | |
1236 | } | |
1237 | ||
e04aad61 | 1238 | if ((r = swap_load_proc_swaps(m, false)) < 0) |
07b0b134 ML |
1239 | swap_shutdown(m); |
1240 | ||
1241 | return r; | |
1242 | } | |
1243 | ||
fdf20a31 | 1244 | static void swap_reset_failed(Unit *u) { |
5632e374 LP |
1245 | Swap *s = SWAP(u); |
1246 | ||
1247 | assert(s); | |
1248 | ||
fdf20a31 | 1249 | if (s->state == SWAP_FAILED) |
5632e374 | 1250 | swap_set_state(s, SWAP_DEAD); |
e04aad61 | 1251 | |
e1770af8 | 1252 | s->result = SWAP_SUCCESS; |
5632e374 LP |
1253 | } |
1254 | ||
c74f17d9 | 1255 | static int swap_kill(Unit *u, KillWho who, int signo, DBusError *error) { |
8a0867d6 LP |
1256 | Swap *s = SWAP(u); |
1257 | int r = 0; | |
1258 | Set *pid_set = NULL; | |
1259 | ||
1260 | assert(s); | |
1261 | ||
1262 | if (who == KILL_MAIN) { | |
1263 | dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "Swap units have no main processes"); | |
a17204af | 1264 | return -ESRCH; |
8a0867d6 LP |
1265 | } |
1266 | ||
1267 | if (s->control_pid <= 0 && who == KILL_CONTROL) { | |
1268 | dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "No control process to kill"); | |
a17204af | 1269 | return -ESRCH; |
8a0867d6 LP |
1270 | } |
1271 | ||
3611581e LP |
1272 | if (who == KILL_CONTROL || who == KILL_ALL) |
1273 | if (s->control_pid > 0) | |
1274 | if (kill(s->control_pid, signo) < 0) | |
1275 | r = -errno; | |
8a0867d6 | 1276 | |
c74f17d9 | 1277 | if (who == KILL_ALL) { |
8a0867d6 LP |
1278 | int q; |
1279 | ||
c74f17d9 LP |
1280 | pid_set = set_new(trivial_hash_func, trivial_compare_func); |
1281 | if (!pid_set) | |
8a0867d6 LP |
1282 | return -ENOMEM; |
1283 | ||
1284 | /* Exclude the control pid from being killed via the cgroup */ | |
c74f17d9 LP |
1285 | if (s->control_pid > 0) { |
1286 | q = set_put(pid_set, LONG_TO_PTR(s->control_pid)); | |
1287 | if (q < 0) { | |
8a0867d6 LP |
1288 | r = q; |
1289 | goto finish; | |
1290 | } | |
c74f17d9 | 1291 | } |
8a0867d6 | 1292 | |
88f3e0c9 | 1293 | q = cgroup_bonding_kill_list(UNIT(s)->cgroup_bondings, signo, false, false, pid_set, NULL); |
c74f17d9 LP |
1294 | if (q < 0 && q != -EAGAIN && q != -ESRCH && q != -ENOENT) |
1295 | r = q; | |
8a0867d6 LP |
1296 | } |
1297 | ||
1298 | finish: | |
1299 | if (pid_set) | |
1300 | set_free(pid_set); | |
1301 | ||
1302 | return r; | |
1303 | } | |
1304 | ||
5632e374 LP |
1305 | static const char* const swap_state_table[_SWAP_STATE_MAX] = { |
1306 | [SWAP_DEAD] = "dead", | |
e04aad61 | 1307 | [SWAP_ACTIVATING] = "activating", |
5632e374 | 1308 | [SWAP_ACTIVE] = "active", |
e04aad61 LP |
1309 | [SWAP_DEACTIVATING] = "deactivating", |
1310 | [SWAP_ACTIVATING_SIGTERM] = "activating-sigterm", | |
1311 | [SWAP_ACTIVATING_SIGKILL] = "activating-sigkill", | |
1312 | [SWAP_DEACTIVATING_SIGTERM] = "deactivating-sigterm", | |
1313 | [SWAP_DEACTIVATING_SIGKILL] = "deactivating-sigkill", | |
fdf20a31 | 1314 | [SWAP_FAILED] = "failed" |
5632e374 LP |
1315 | }; |
1316 | ||
1317 | DEFINE_STRING_TABLE_LOOKUP(swap_state, SwapState); | |
1318 | ||
e04aad61 LP |
1319 | static const char* const swap_exec_command_table[_SWAP_EXEC_COMMAND_MAX] = { |
1320 | [SWAP_EXEC_ACTIVATE] = "ExecActivate", | |
1321 | [SWAP_EXEC_DEACTIVATE] = "ExecDeactivate", | |
1322 | }; | |
1323 | ||
1324 | DEFINE_STRING_TABLE_LOOKUP(swap_exec_command, SwapExecCommand); | |
1325 | ||
e1770af8 LP |
1326 | static const char* const swap_result_table[_SWAP_RESULT_MAX] = { |
1327 | [SWAP_SUCCESS] = "success", | |
1328 | [SWAP_FAILURE_RESOURCES] = "resources", | |
1329 | [SWAP_FAILURE_TIMEOUT] = "timeout", | |
1330 | [SWAP_FAILURE_EXIT_CODE] = "exit-code", | |
1331 | [SWAP_FAILURE_SIGNAL] = "signal", | |
1332 | [SWAP_FAILURE_CORE_DUMP] = "core-dump" | |
1333 | }; | |
1334 | ||
1335 | DEFINE_STRING_TABLE_LOOKUP(swap_result, SwapResult); | |
1336 | ||
07b0b134 | 1337 | const UnitVTable swap_vtable = { |
7d17cfbc | 1338 | .object_size = sizeof(Swap), |
3ef63c31 LP |
1339 | .exec_context_offset = offsetof(Swap, exec_context), |
1340 | ||
f975e971 LP |
1341 | .sections = |
1342 | "Unit\0" | |
1343 | "Swap\0" | |
1344 | "Install\0", | |
07b0b134 | 1345 | |
e04aad61 | 1346 | .no_alias = true, |
07b0b134 ML |
1347 | .no_instances = true, |
1348 | ||
4e85aff4 | 1349 | .init = swap_init, |
07b0b134 | 1350 | .load = swap_load, |
6e620bec | 1351 | .done = swap_done, |
07b0b134 ML |
1352 | |
1353 | .coldplug = swap_coldplug, | |
1354 | ||
1355 | .dump = swap_dump, | |
1356 | ||
1357 | .start = swap_start, | |
1358 | .stop = swap_stop, | |
1359 | ||
8a0867d6 LP |
1360 | .kill = swap_kill, |
1361 | ||
07b0b134 ML |
1362 | .serialize = swap_serialize, |
1363 | .deserialize_item = swap_deserialize_item, | |
1364 | ||
1365 | .active_state = swap_active_state, | |
1366 | .sub_state_to_string = swap_sub_state_to_string, | |
1367 | ||
1368 | .check_gc = swap_check_gc, | |
1369 | ||
e04aad61 LP |
1370 | .sigchld_event = swap_sigchld_event, |
1371 | .timer_event = swap_timer_event, | |
1372 | ||
1373 | .reset_failed = swap_reset_failed, | |
1374 | ||
c4e2ceae | 1375 | .bus_interface = "org.freedesktop.systemd1.Swap", |
07b0b134 | 1376 | .bus_message_handler = bus_swap_message_handler, |
c4e2ceae | 1377 | .bus_invalidating_properties = bus_swap_invalidating_properties, |
07b0b134 | 1378 | |
e04aad61 | 1379 | .following = swap_following, |
6210e7fc | 1380 | .following_set = swap_following_set, |
5632e374 | 1381 | |
6e620bec | 1382 | .enumerate = swap_enumerate, |
c6918296 MS |
1383 | .shutdown = swap_shutdown, |
1384 | ||
1385 | .status_message_formats = { | |
1386 | .starting_stopping = { | |
1387 | [0] = "Activating swap %s...", | |
1388 | [1] = "Deactivating swap %s...", | |
1389 | }, | |
1390 | .finished_start_job = { | |
1391 | [JOB_DONE] = "Activated swap %s.", | |
1392 | [JOB_FAILED] = "Failed to activate swap %s.", | |
1393 | [JOB_DEPENDENCY] = "Dependency failed for %s.", | |
1394 | [JOB_TIMEOUT] = "Timed out activating swap %s.", | |
1395 | }, | |
1396 | .finished_stop_job = { | |
1397 | [JOB_DONE] = "Deactivated swap %s.", | |
1398 | [JOB_FAILED] = "Failed deactivating swap %s.", | |
1399 | [JOB_TIMEOUT] = "Timed out deactivating swap %s.", | |
1400 | }, | |
1401 | }, | |
07b0b134 | 1402 | }; |