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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; | |
df326b84 | 58 | Hashmap *swaps; |
e04aad61 LP |
59 | |
60 | assert(s); | |
61 | ||
62 | if (!s->parameters_proc_swaps.what) | |
63 | return; | |
64 | ||
65 | /* Remove this unit from the chain of swaps which share the | |
66 | * same kernel swap device. */ | |
df326b84 ZJS |
67 | swaps = UNIT(s)->manager->swaps_by_proc_swaps; |
68 | first = hashmap_get(swaps, s->parameters_proc_swaps.what); | |
e04aad61 LP |
69 | LIST_REMOVE(Swap, same_proc_swaps, first, s); |
70 | ||
71 | if (first) | |
df326b84 ZJS |
72 | hashmap_remove_and_replace(swaps, |
73 | s->parameters_proc_swaps.what, | |
74 | first->parameters_proc_swaps.what, | |
75 | first); | |
e04aad61 | 76 | else |
df326b84 | 77 | hashmap_remove(swaps, s->parameters_proc_swaps.what); |
e04aad61 LP |
78 | |
79 | free(s->parameters_proc_swaps.what); | |
80 | s->parameters_proc_swaps.what = NULL; | |
81 | } | |
82 | ||
f6cebb3b | 83 | static void swap_init(Unit *u) { |
6e620bec LP |
84 | Swap *s = SWAP(u); |
85 | ||
86 | assert(s); | |
1124fe6f | 87 | assert(UNIT(s)->load_state == UNIT_STUB); |
6e620bec | 88 | |
e04aad61 LP |
89 | s->timeout_usec = DEFAULT_TIMEOUT_USEC; |
90 | ||
91 | exec_context_init(&s->exec_context); | |
ac155bb8 MS |
92 | s->exec_context.std_output = u->manager->default_std_output; |
93 | s->exec_context.std_error = u->manager->default_std_error; | |
4819ff03 | 94 | kill_context_init(&s->kill_context); |
4ad49000 | 95 | cgroup_context_init(&s->cgroup_context); |
e04aad61 | 96 | |
6b1dc2bd | 97 | s->parameters_proc_swaps.priority = s->parameters_fragment.priority = -1; |
e04aad61 LP |
98 | |
99 | s->timer_watch.type = WATCH_INVALID; | |
100 | ||
e1770af8 | 101 | s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; |
c8f4d764 | 102 | |
1124fe6f | 103 | UNIT(s)->ignore_on_isolate = true; |
e04aad61 LP |
104 | } |
105 | ||
106 | static void swap_unwatch_control_pid(Swap *s) { | |
107 | assert(s); | |
108 | ||
109 | if (s->control_pid <= 0) | |
110 | return; | |
111 | ||
112 | unit_unwatch_pid(UNIT(s), s->control_pid); | |
113 | s->control_pid = 0; | |
6e620bec LP |
114 | } |
115 | ||
4e85aff4 LP |
116 | static void swap_done(Unit *u) { |
117 | Swap *s = SWAP(u); | |
07b0b134 | 118 | |
4e85aff4 | 119 | assert(s); |
07b0b134 | 120 | |
e04aad61 LP |
121 | swap_unset_proc_swaps(s); |
122 | ||
4e85aff4 | 123 | free(s->what); |
e04aad61 LP |
124 | s->what = NULL; |
125 | ||
4e85aff4 | 126 | free(s->parameters_fragment.what); |
6b1dc2bd | 127 | s->parameters_fragment.what = NULL; |
e04aad61 | 128 | |
c17ec25e | 129 | exec_context_done(&s->exec_context, manager_is_reloading_or_reexecuting(u->manager)); |
e04aad61 LP |
130 | exec_command_done_array(s->exec_command, _SWAP_EXEC_COMMAND_MAX); |
131 | s->control_command = NULL; | |
132 | ||
4ad49000 LP |
133 | cgroup_context_done(&s->cgroup_context); |
134 | ||
e04aad61 LP |
135 | swap_unwatch_control_pid(s); |
136 | ||
137 | unit_unwatch_timer(u, &s->timer_watch); | |
07b0b134 ML |
138 | } |
139 | ||
6e2ef85b LP |
140 | int swap_add_one_mount_link(Swap *s, Mount *m) { |
141 | int r; | |
142 | ||
143 | assert(s); | |
144 | assert(m); | |
145 | ||
1124fe6f MS |
146 | if (UNIT(s)->load_state != UNIT_LOADED || |
147 | UNIT(m)->load_state != UNIT_LOADED) | |
6e2ef85b LP |
148 | return 0; |
149 | ||
8407a5d0 LP |
150 | if (is_device_path(s->what)) |
151 | return 0; | |
152 | ||
6e2ef85b LP |
153 | if (!path_startswith(s->what, m->where)) |
154 | return 0; | |
155 | ||
646134dc ZJS |
156 | r = unit_add_two_dependencies(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true); |
157 | if (r < 0) | |
6e2ef85b LP |
158 | return r; |
159 | ||
160 | return 0; | |
161 | } | |
162 | ||
163 | static int swap_add_mount_links(Swap *s) { | |
ac155bb8 | 164 | Unit *other; |
6e2ef85b LP |
165 | int r; |
166 | ||
167 | assert(s); | |
168 | ||
1124fe6f | 169 | LIST_FOREACH(units_by_type, other, UNIT(s)->manager->units_by_type[UNIT_MOUNT]) |
595ed347 | 170 | if ((r = swap_add_one_mount_link(s, MOUNT(other))) < 0) |
6e2ef85b LP |
171 | return r; |
172 | ||
173 | return 0; | |
174 | } | |
175 | ||
173a8d04 LP |
176 | static int swap_add_device_links(Swap *s) { |
177 | SwapParameters *p; | |
178 | ||
179 | assert(s); | |
180 | ||
181 | if (!s->what) | |
182 | return 0; | |
183 | ||
184 | if (s->from_fragment) | |
185 | p = &s->parameters_fragment; | |
173a8d04 LP |
186 | else |
187 | return 0; | |
188 | ||
cfcfd4ae LP |
189 | if (is_device_path(s->what)) |
190 | return unit_add_node_link(UNIT(s), s->what, | |
191 | !p->noauto && p->nofail && | |
67445f4e | 192 | UNIT(s)->manager->running_as == SYSTEMD_SYSTEM); |
cfcfd4ae LP |
193 | else |
194 | /* File based swap devices need to be ordered after | |
2b93b027 | 195 | * systemd-remount-fs.service, since they might need a |
cfcfd4ae | 196 | * writable file system. */ |
2b93b027 | 197 | return unit_add_dependency_by_name(UNIT(s), UNIT_AFTER, SPECIAL_REMOUNT_FS_SERVICE, NULL, true); |
173a8d04 LP |
198 | } |
199 | ||
2edd4434 LP |
200 | static int swap_add_default_dependencies(Swap *s) { |
201 | int r; | |
202 | ||
203 | assert(s); | |
204 | ||
67445f4e | 205 | if (UNIT(s)->manager->running_as != SYSTEMD_SYSTEM) |
6b1dc2bd | 206 | return 0; |
2edd4434 | 207 | |
c0387ebf LP |
208 | if (detect_container(NULL) > 0) |
209 | return 0; | |
210 | ||
6b1dc2bd LP |
211 | r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true); |
212 | if (r < 0) | |
213 | return r; | |
2edd4434 LP |
214 | |
215 | return 0; | |
216 | } | |
217 | ||
4e85aff4 LP |
218 | static int swap_verify(Swap *s) { |
219 | bool b; | |
7fd1b19b | 220 | _cleanup_free_ char *e = NULL; |
4e85aff4 | 221 | |
1124fe6f | 222 | if (UNIT(s)->load_state != UNIT_LOADED) |
4e85aff4 LP |
223 | return 0; |
224 | ||
170ca19e ZJS |
225 | e = unit_name_from_path(s->what, ".swap"); |
226 | if (e == NULL) | |
227 | return log_oom(); | |
4e85aff4 LP |
228 | |
229 | b = unit_has_name(UNIT(s), e); | |
4e85aff4 | 230 | if (!b) { |
66870f90 ZJS |
231 | log_error_unit(UNIT(s)->id, |
232 | "%s: Value of \"What\" and unit name do not match, not loading.", | |
233 | UNIT(s)->id); | |
4e85aff4 LP |
234 | return -EINVAL; |
235 | } | |
236 | ||
4819ff03 | 237 | if (s->exec_context.pam_name && s->kill_context.kill_mode != KILL_CONTROL_GROUP) { |
66870f90 ZJS |
238 | log_error_unit(UNIT(s)->id, |
239 | "%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing to load.", | |
240 | UNIT(s)->id); | |
e04aad61 LP |
241 | return -EINVAL; |
242 | } | |
243 | ||
4e85aff4 LP |
244 | return 0; |
245 | } | |
246 | ||
07b0b134 ML |
247 | static int swap_load(Unit *u) { |
248 | int r; | |
249 | Swap *s = SWAP(u); | |
250 | ||
251 | assert(s); | |
ac155bb8 | 252 | assert(u->load_state == UNIT_STUB); |
07b0b134 ML |
253 | |
254 | /* Load a .swap file */ | |
646134dc ZJS |
255 | r = unit_load_fragment_and_dropin_optional(u); |
256 | if (r < 0) | |
07b0b134 ML |
257 | return r; |
258 | ||
ac155bb8 | 259 | if (u->load_state == UNIT_LOADED) { |
646134dc ZJS |
260 | r = unit_add_exec_dependencies(u, &s->exec_context); |
261 | if (r < 0) | |
27abbe82 | 262 | return r; |
4e85aff4 | 263 | |
1124fe6f | 264 | if (UNIT(s)->fragment_path) |
4e85aff4 LP |
265 | s->from_fragment = true; |
266 | ||
267 | if (!s->what) { | |
268 | if (s->parameters_fragment.what) | |
269 | s->what = strdup(s->parameters_fragment.what); | |
4e85aff4 LP |
270 | else if (s->parameters_proc_swaps.what) |
271 | s->what = strdup(s->parameters_proc_swaps.what); | |
272 | else | |
ac155bb8 | 273 | s->what = unit_name_to_path(u->id); |
4e85aff4 LP |
274 | |
275 | if (!s->what) | |
07b0b134 | 276 | return -ENOMEM; |
4e85aff4 | 277 | } |
07b0b134 ML |
278 | |
279 | path_kill_slashes(s->what); | |
280 | ||
1124fe6f | 281 | if (!UNIT(s)->description) |
4e85aff4 LP |
282 | if ((r = unit_set_description(u, s->what)) < 0) |
283 | return r; | |
284 | ||
646134dc ZJS |
285 | r = swap_add_device_links(s); |
286 | if (r < 0) | |
07b0b134 ML |
287 | return r; |
288 | ||
646134dc ZJS |
289 | r = swap_add_mount_links(s); |
290 | if (r < 0) | |
6e2ef85b | 291 | return r; |
07b0b134 | 292 | |
a016b922 LP |
293 | r = unit_add_default_slice(u); |
294 | if (r < 0) | |
295 | return r; | |
296 | ||
646134dc ZJS |
297 | if (UNIT(s)->default_dependencies) { |
298 | r = swap_add_default_dependencies(s); | |
299 | if (r < 0) | |
2edd4434 | 300 | return r; |
646134dc | 301 | } |
e06c73cc | 302 | |
cba6e062 | 303 | r = unit_exec_context_defaults(u, &s->exec_context); |
e06c73cc LP |
304 | if (r < 0) |
305 | return r; | |
07b0b134 ML |
306 | } |
307 | ||
308 | return swap_verify(s); | |
309 | } | |
310 | ||
6b1dc2bd | 311 | static int swap_add_one( |
4e85aff4 LP |
312 | Manager *m, |
313 | const char *what, | |
e04aad61 | 314 | const char *what_proc_swaps, |
4e85aff4 LP |
315 | int priority, |
316 | bool noauto, | |
173a8d04 | 317 | bool nofail, |
e04aad61 LP |
318 | bool set_flags) { |
319 | ||
4e85aff4 | 320 | Unit *u = NULL; |
7fd1b19b | 321 | _cleanup_free_ char *e = NULL; |
170ca19e | 322 | char *wp = NULL; |
2c7c6144 | 323 | bool delete = false; |
07b0b134 | 324 | int r; |
4e85aff4 | 325 | SwapParameters *p; |
6b1dc2bd | 326 | Swap *first; |
4e85aff4 LP |
327 | |
328 | assert(m); | |
329 | assert(what); | |
6b1dc2bd | 330 | assert(what_proc_swaps); |
07b0b134 | 331 | |
7d17cfbc MS |
332 | e = unit_name_from_path(what, ".swap"); |
333 | if (!e) | |
170ca19e | 334 | return log_oom(); |
07b0b134 | 335 | |
e04aad61 LP |
336 | u = manager_get_unit(m, e); |
337 | ||
6b1dc2bd | 338 | if (u && |
e04aad61 LP |
339 | SWAP(u)->from_proc_swaps && |
340 | !path_equal(SWAP(u)->parameters_proc_swaps.what, what_proc_swaps)) | |
341 | return -EEXIST; | |
4e85aff4 LP |
342 | |
343 | if (!u) { | |
07b0b134 ML |
344 | delete = true; |
345 | ||
7d17cfbc | 346 | u = unit_new(m, sizeof(Swap)); |
170ca19e ZJS |
347 | if (!u) |
348 | return log_oom(); | |
e04aad61 | 349 | |
7d17cfbc MS |
350 | r = unit_add_name(u, e); |
351 | if (r < 0) | |
e04aad61 LP |
352 | goto fail; |
353 | ||
7d17cfbc MS |
354 | SWAP(u)->what = strdup(what); |
355 | if (!SWAP(u)->what) { | |
646134dc | 356 | r = log_oom(); |
e04aad61 LP |
357 | goto fail; |
358 | } | |
359 | ||
360 | unit_add_to_load_queue(u); | |
4e85aff4 LP |
361 | } else |
362 | delete = false; | |
07b0b134 | 363 | |
6b1dc2bd | 364 | p = &SWAP(u)->parameters_proc_swaps; |
07b0b134 | 365 | |
6b1dc2bd | 366 | if (!p->what) { |
646134dc ZJS |
367 | wp = strdup(what_proc_swaps); |
368 | if (!wp) { | |
369 | r = log_oom(); | |
6b1dc2bd LP |
370 | goto fail; |
371 | } | |
e04aad61 | 372 | |
646134dc ZJS |
373 | if (!m->swaps_by_proc_swaps) { |
374 | m->swaps_by_proc_swaps = hashmap_new(string_hash_func, string_compare_func); | |
375 | if (!m->swaps_by_proc_swaps) { | |
376 | r = log_oom(); | |
e04aad61 LP |
377 | goto fail; |
378 | } | |
646134dc | 379 | } |
e04aad61 | 380 | |
6b1dc2bd LP |
381 | free(p->what); |
382 | p->what = wp; | |
e04aad61 | 383 | |
6b1dc2bd LP |
384 | first = hashmap_get(m->swaps_by_proc_swaps, wp); |
385 | LIST_PREPEND(Swap, same_proc_swaps, first, SWAP(u)); | |
e04aad61 | 386 | |
646134dc ZJS |
387 | r = hashmap_replace(m->swaps_by_proc_swaps, wp, first); |
388 | if (r < 0) | |
e04aad61 | 389 | goto fail; |
6b1dc2bd | 390 | } |
e04aad61 | 391 | |
6b1dc2bd LP |
392 | if (set_flags) { |
393 | SWAP(u)->is_active = true; | |
394 | SWAP(u)->just_activated = !SWAP(u)->from_proc_swaps; | |
4e85aff4 | 395 | } |
07b0b134 | 396 | |
6b1dc2bd LP |
397 | SWAP(u)->from_proc_swaps = true; |
398 | ||
4e85aff4 LP |
399 | p->priority = priority; |
400 | p->noauto = noauto; | |
173a8d04 | 401 | p->nofail = nofail; |
07b0b134 | 402 | |
4e85aff4 | 403 | unit_add_to_dbus_queue(u); |
07b0b134 | 404 | |
07b0b134 ML |
405 | return 0; |
406 | ||
407 | fail: | |
66870f90 | 408 | log_warning_unit(e, "Failed to load swap unit: %s", strerror(-r)); |
e04aad61 LP |
409 | |
410 | free(wp); | |
4e85aff4 LP |
411 | |
412 | if (delete && u) | |
07b0b134 ML |
413 | unit_free(u); |
414 | ||
4e85aff4 | 415 | return r; |
07b0b134 ML |
416 | } |
417 | ||
e04aad61 LP |
418 | static int swap_process_new_swap(Manager *m, const char *device, int prio, bool set_flags) { |
419 | struct stat st; | |
420 | int r = 0, k; | |
421 | ||
422 | assert(m); | |
423 | ||
424 | if (stat(device, &st) >= 0 && S_ISBLK(st.st_mode)) { | |
425 | struct udev_device *d; | |
426 | const char *dn; | |
427 | struct udev_list_entry *item = NULL, *first = NULL; | |
428 | ||
429 | /* So this is a proper swap device. Create swap units | |
430 | * for all names this swap device is known under */ | |
431 | ||
646134dc ZJS |
432 | d = udev_device_new_from_devnum(m->udev, 'b', st.st_rdev); |
433 | if (!d) | |
434 | return log_oom(); | |
e04aad61 | 435 | |
8d8e9456 | 436 | dn = udev_device_get_devnode(d); |
b61e8816 OB |
437 | /* Skip dn==device, since that case will be handled below */ |
438 | if (dn && !streq(dn, device)) | |
8d8e9456 | 439 | r = swap_add_one(m, dn, device, prio, false, false, set_flags); |
e04aad61 LP |
440 | |
441 | /* Add additional units for all symlinks */ | |
442 | first = udev_device_get_devlinks_list_entry(d); | |
443 | udev_list_entry_foreach(item, first) { | |
444 | const char *p; | |
445 | ||
446 | /* Don't bother with the /dev/block links */ | |
447 | p = udev_list_entry_get_name(item); | |
448 | ||
449 | if (path_startswith(p, "/dev/block/")) | |
450 | continue; | |
451 | ||
452 | if (stat(p, &st) >= 0) | |
646134dc ZJS |
453 | if ((!S_ISBLK(st.st_mode)) || |
454 | st.st_rdev != udev_device_get_devnum(d)) | |
e04aad61 LP |
455 | continue; |
456 | ||
8d8e9456 LP |
457 | k = swap_add_one(m, p, device, prio, false, false, set_flags); |
458 | if (k < 0) | |
e04aad61 LP |
459 | r = k; |
460 | } | |
461 | ||
462 | udev_device_unref(d); | |
463 | } | |
464 | ||
8d8e9456 LP |
465 | k = swap_add_one(m, device, device, prio, false, false, set_flags); |
466 | if (k < 0) | |
e04aad61 LP |
467 | r = k; |
468 | ||
469 | return r; | |
470 | } | |
471 | ||
07b0b134 ML |
472 | static void swap_set_state(Swap *s, SwapState state) { |
473 | SwapState old_state; | |
e04aad61 | 474 | |
07b0b134 ML |
475 | assert(s); |
476 | ||
477 | old_state = s->state; | |
478 | s->state = state; | |
479 | ||
e04aad61 LP |
480 | if (state != SWAP_ACTIVATING && |
481 | state != SWAP_ACTIVATING_SIGTERM && | |
482 | state != SWAP_ACTIVATING_SIGKILL && | |
483 | state != SWAP_DEACTIVATING && | |
484 | state != SWAP_DEACTIVATING_SIGTERM && | |
485 | state != SWAP_DEACTIVATING_SIGKILL) { | |
486 | unit_unwatch_timer(UNIT(s), &s->timer_watch); | |
487 | swap_unwatch_control_pid(s); | |
488 | s->control_command = NULL; | |
489 | s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; | |
490 | } | |
491 | ||
07b0b134 | 492 | if (state != old_state) |
66870f90 ZJS |
493 | log_debug_unit(UNIT(s)->id, |
494 | "%s changed %s -> %s", | |
495 | UNIT(s)->id, | |
496 | swap_state_to_string(old_state), | |
497 | swap_state_to_string(state)); | |
07b0b134 | 498 | |
646134dc ZJS |
499 | unit_notify(UNIT(s), state_translation_table[old_state], |
500 | state_translation_table[state], true); | |
07b0b134 ML |
501 | } |
502 | ||
503 | static int swap_coldplug(Unit *u) { | |
504 | Swap *s = SWAP(u); | |
505 | SwapState new_state = SWAP_DEAD; | |
e04aad61 | 506 | int r; |
07b0b134 ML |
507 | |
508 | assert(s); | |
509 | assert(s->state == SWAP_DEAD); | |
510 | ||
511 | if (s->deserialized_state != s->state) | |
512 | new_state = s->deserialized_state; | |
4e85aff4 | 513 | else if (s->from_proc_swaps) |
07b0b134 ML |
514 | new_state = SWAP_ACTIVE; |
515 | ||
e04aad61 LP |
516 | if (new_state != s->state) { |
517 | ||
518 | if (new_state == SWAP_ACTIVATING || | |
519 | new_state == SWAP_ACTIVATING_SIGTERM || | |
520 | new_state == SWAP_ACTIVATING_SIGKILL || | |
521 | new_state == SWAP_DEACTIVATING || | |
522 | new_state == SWAP_DEACTIVATING_SIGTERM || | |
523 | new_state == SWAP_DEACTIVATING_SIGKILL) { | |
524 | ||
525 | if (s->control_pid <= 0) | |
526 | return -EBADMSG; | |
527 | ||
646134dc ZJS |
528 | r = unit_watch_pid(UNIT(s), s->control_pid); |
529 | if (r < 0) | |
e04aad61 LP |
530 | return r; |
531 | ||
36697dc0 | 532 | r = unit_watch_timer(UNIT(s), CLOCK_MONOTONIC, true, s->timeout_usec, &s->timer_watch); |
646134dc | 533 | if (r < 0) |
e04aad61 LP |
534 | return r; |
535 | } | |
536 | ||
4e85aff4 | 537 | swap_set_state(s, new_state); |
e04aad61 | 538 | } |
07b0b134 ML |
539 | |
540 | return 0; | |
541 | } | |
542 | ||
543 | static void swap_dump(Unit *u, FILE *f, const char *prefix) { | |
544 | Swap *s = SWAP(u); | |
4e85aff4 | 545 | SwapParameters *p; |
07b0b134 ML |
546 | |
547 | assert(s); | |
4e85aff4 LP |
548 | assert(f); |
549 | ||
550 | if (s->from_proc_swaps) | |
551 | p = &s->parameters_proc_swaps; | |
552 | else if (s->from_fragment) | |
553 | p = &s->parameters_fragment; | |
b6bfc7bb LP |
554 | else |
555 | p = NULL; | |
07b0b134 ML |
556 | |
557 | fprintf(f, | |
4e85aff4 | 558 | "%sSwap State: %s\n" |
e1770af8 | 559 | "%sResult: %s\n" |
07b0b134 | 560 | "%sWhat: %s\n" |
4e85aff4 LP |
561 | "%sFrom /proc/swaps: %s\n" |
562 | "%sFrom fragment: %s\n", | |
07b0b134 | 563 | prefix, swap_state_to_string(s->state), |
e1770af8 | 564 | prefix, swap_result_to_string(s->result), |
07b0b134 | 565 | prefix, s->what, |
4e85aff4 LP |
566 | prefix, yes_no(s->from_proc_swaps), |
567 | prefix, yes_no(s->from_fragment)); | |
e04aad61 | 568 | |
b6bfc7bb LP |
569 | if (p) |
570 | fprintf(f, | |
571 | "%sPriority: %i\n" | |
572 | "%sNoAuto: %s\n" | |
573 | "%sNoFail: %s\n", | |
574 | prefix, p->priority, | |
575 | prefix, yes_no(p->noauto), | |
576 | prefix, yes_no(p->nofail)); | |
577 | ||
e04aad61 LP |
578 | if (s->control_pid > 0) |
579 | fprintf(f, | |
580 | "%sControl PID: %lu\n", | |
581 | prefix, (unsigned long) s->control_pid); | |
582 | ||
583 | exec_context_dump(&s->exec_context, f, prefix); | |
4819ff03 | 584 | kill_context_dump(&s->kill_context, f, prefix); |
e04aad61 LP |
585 | } |
586 | ||
587 | static int swap_spawn(Swap *s, ExecCommand *c, pid_t *_pid) { | |
588 | pid_t pid; | |
589 | int r; | |
590 | ||
591 | assert(s); | |
592 | assert(c); | |
593 | assert(_pid); | |
594 | ||
4ad49000 LP |
595 | unit_realize_cgroup(UNIT(s)); |
596 | ||
36697dc0 | 597 | r = unit_watch_timer(UNIT(s), CLOCK_MONOTONIC, true, s->timeout_usec, &s->timer_watch); |
646134dc | 598 | if (r < 0) |
e04aad61 LP |
599 | goto fail; |
600 | ||
646134dc ZJS |
601 | r = exec_spawn(c, |
602 | NULL, | |
603 | &s->exec_context, | |
604 | NULL, 0, | |
605 | UNIT(s)->manager->environment, | |
606 | true, | |
607 | true, | |
608 | true, | |
609 | UNIT(s)->manager->confirm_spawn, | |
4ad49000 LP |
610 | UNIT(s)->cgroup_mask, |
611 | UNIT(s)->cgroup_path, | |
646134dc ZJS |
612 | UNIT(s)->id, |
613 | NULL, | |
614 | &pid); | |
615 | if (r < 0) | |
e04aad61 LP |
616 | goto fail; |
617 | ||
646134dc ZJS |
618 | r = unit_watch_pid(UNIT(s), pid); |
619 | if (r < 0) | |
e04aad61 LP |
620 | /* FIXME: we need to do something here */ |
621 | goto fail; | |
622 | ||
623 | *_pid = pid; | |
624 | ||
625 | return 0; | |
626 | ||
627 | fail: | |
628 | unit_unwatch_timer(UNIT(s), &s->timer_watch); | |
629 | ||
630 | return r; | |
07b0b134 ML |
631 | } |
632 | ||
e1770af8 | 633 | static void swap_enter_dead(Swap *s, SwapResult f) { |
07b0b134 ML |
634 | assert(s); |
635 | ||
e1770af8 LP |
636 | if (f != SWAP_SUCCESS) |
637 | s->result = f; | |
e04aad61 | 638 | |
c17ec25e | 639 | exec_context_tmp_dirs_done(&s->exec_context); |
e1770af8 | 640 | swap_set_state(s, s->result != SWAP_SUCCESS ? SWAP_FAILED : SWAP_DEAD); |
07b0b134 ML |
641 | } |
642 | ||
e1770af8 | 643 | static void swap_enter_active(Swap *s, SwapResult f) { |
e04aad61 LP |
644 | assert(s); |
645 | ||
e1770af8 LP |
646 | if (f != SWAP_SUCCESS) |
647 | s->result = f; | |
e04aad61 LP |
648 | |
649 | swap_set_state(s, SWAP_ACTIVE); | |
650 | } | |
651 | ||
e1770af8 | 652 | static void swap_enter_signal(Swap *s, SwapState state, SwapResult f) { |
07b0b134 ML |
653 | int r; |
654 | ||
655 | assert(s); | |
e04aad61 | 656 | |
e1770af8 LP |
657 | if (f != SWAP_SUCCESS) |
658 | s->result = f; | |
e04aad61 | 659 | |
cd2086fe LP |
660 | r = unit_kill_context( |
661 | UNIT(s), | |
662 | &s->kill_context, | |
663 | state != SWAP_ACTIVATING_SIGTERM && state != SWAP_DEACTIVATING_SIGTERM, | |
664 | -1, | |
665 | s->control_pid, | |
666 | false); | |
667 | if (r < 0) | |
668 | goto fail; | |
e04aad61 | 669 | |
cd2086fe | 670 | if (r > 0) { |
36697dc0 | 671 | r = unit_watch_timer(UNIT(s), CLOCK_MONOTONIC, true, s->timeout_usec, &s->timer_watch); |
646134dc | 672 | if (r < 0) |
e04aad61 LP |
673 | goto fail; |
674 | ||
675 | swap_set_state(s, state); | |
676 | } else | |
e1770af8 | 677 | swap_enter_dead(s, SWAP_SUCCESS); |
e04aad61 LP |
678 | |
679 | return; | |
680 | ||
681 | fail: | |
66870f90 ZJS |
682 | log_warning_unit(UNIT(s)->id, |
683 | "%s failed to kill processes: %s", UNIT(s)->id, strerror(-r)); | |
e04aad61 | 684 | |
e1770af8 | 685 | swap_enter_dead(s, SWAP_FAILURE_RESOURCES); |
e04aad61 LP |
686 | } |
687 | ||
688 | static void swap_enter_activating(Swap *s) { | |
689 | int r, priority; | |
690 | ||
691 | assert(s); | |
692 | ||
693 | s->control_command_id = SWAP_EXEC_ACTIVATE; | |
694 | s->control_command = s->exec_command + SWAP_EXEC_ACTIVATE; | |
07b0b134 | 695 | |
4e85aff4 LP |
696 | if (s->from_fragment) |
697 | priority = s->parameters_fragment.priority; | |
e04aad61 LP |
698 | else |
699 | priority = -1; | |
4e85aff4 | 700 | |
e04aad61 LP |
701 | if (priority >= 0) { |
702 | char p[LINE_MAX]; | |
07b0b134 | 703 | |
e04aad61 LP |
704 | snprintf(p, sizeof(p), "%i", priority); |
705 | char_array_0(p); | |
07b0b134 | 706 | |
e04aad61 LP |
707 | r = exec_command_set( |
708 | s->control_command, | |
709 | "/sbin/swapon", | |
710 | "-p", | |
711 | p, | |
712 | s->what, | |
713 | NULL); | |
714 | } else | |
715 | r = exec_command_set( | |
716 | s->control_command, | |
717 | "/sbin/swapon", | |
718 | s->what, | |
719 | NULL); | |
720 | ||
721 | if (r < 0) | |
722 | goto fail; | |
723 | ||
724 | swap_unwatch_control_pid(s); | |
725 | ||
646134dc ZJS |
726 | r = swap_spawn(s, s->control_command, &s->control_pid); |
727 | if (r < 0) | |
e04aad61 LP |
728 | goto fail; |
729 | ||
730 | swap_set_state(s, SWAP_ACTIVATING); | |
731 | ||
732 | return; | |
733 | ||
734 | fail: | |
66870f90 ZJS |
735 | log_warning_unit(UNIT(s)->id, |
736 | "%s failed to run 'swapon' task: %s", | |
737 | UNIT(s)->id, strerror(-r)); | |
e1770af8 | 738 | swap_enter_dead(s, SWAP_FAILURE_RESOURCES); |
e04aad61 LP |
739 | } |
740 | ||
e1770af8 | 741 | static void swap_enter_deactivating(Swap *s) { |
e04aad61 LP |
742 | int r; |
743 | ||
744 | assert(s); | |
745 | ||
e04aad61 LP |
746 | s->control_command_id = SWAP_EXEC_DEACTIVATE; |
747 | s->control_command = s->exec_command + SWAP_EXEC_DEACTIVATE; | |
748 | ||
646134dc | 749 | r = exec_command_set(s->control_command, |
e04aad61 LP |
750 | "/sbin/swapoff", |
751 | s->what, | |
646134dc ZJS |
752 | NULL); |
753 | if (r < 0) | |
e04aad61 LP |
754 | goto fail; |
755 | ||
756 | swap_unwatch_control_pid(s); | |
757 | ||
646134dc ZJS |
758 | r = swap_spawn(s, s->control_command, &s->control_pid); |
759 | if (r < 0) | |
e04aad61 LP |
760 | goto fail; |
761 | ||
762 | swap_set_state(s, SWAP_DEACTIVATING); | |
763 | ||
764 | return; | |
765 | ||
766 | fail: | |
66870f90 ZJS |
767 | log_warning_unit(UNIT(s)->id, |
768 | "%s failed to run 'swapoff' task: %s", | |
769 | UNIT(s)->id, strerror(-r)); | |
e1770af8 | 770 | swap_enter_active(s, SWAP_FAILURE_RESOURCES); |
e04aad61 LP |
771 | } |
772 | ||
773 | static int swap_start(Unit *u) { | |
774 | Swap *s = SWAP(u); | |
775 | ||
776 | assert(s); | |
777 | ||
778 | /* We cannot fulfill this request right now, try again later | |
779 | * please! */ | |
780 | ||
781 | if (s->state == SWAP_DEACTIVATING || | |
782 | s->state == SWAP_DEACTIVATING_SIGTERM || | |
783 | s->state == SWAP_DEACTIVATING_SIGKILL || | |
784 | s->state == SWAP_ACTIVATING_SIGTERM || | |
785 | s->state == SWAP_ACTIVATING_SIGKILL) | |
786 | return -EAGAIN; | |
787 | ||
788 | if (s->state == SWAP_ACTIVATING) | |
789 | return 0; | |
790 | ||
791 | assert(s->state == SWAP_DEAD || s->state == SWAP_FAILED); | |
792 | ||
a5c3034f LP |
793 | if (detect_container(NULL) > 0) |
794 | return -EPERM; | |
795 | ||
e1770af8 | 796 | s->result = SWAP_SUCCESS; |
e04aad61 | 797 | swap_enter_activating(s); |
07b0b134 ML |
798 | return 0; |
799 | } | |
800 | ||
801 | static int swap_stop(Unit *u) { | |
802 | Swap *s = SWAP(u); | |
07b0b134 ML |
803 | |
804 | assert(s); | |
805 | ||
e04aad61 LP |
806 | if (s->state == SWAP_DEACTIVATING || |
807 | s->state == SWAP_DEACTIVATING_SIGTERM || | |
808 | s->state == SWAP_DEACTIVATING_SIGKILL || | |
809 | s->state == SWAP_ACTIVATING_SIGTERM || | |
810 | s->state == SWAP_ACTIVATING_SIGKILL) | |
811 | return 0; | |
07b0b134 | 812 | |
e04aad61 LP |
813 | assert(s->state == SWAP_ACTIVATING || |
814 | s->state == SWAP_ACTIVE); | |
07b0b134 | 815 | |
a5c3034f LP |
816 | if (detect_container(NULL) > 0) |
817 | return -EPERM; | |
818 | ||
e1770af8 | 819 | swap_enter_deactivating(s); |
07b0b134 ML |
820 | return 0; |
821 | } | |
822 | ||
823 | static int swap_serialize(Unit *u, FILE *f, FDSet *fds) { | |
824 | Swap *s = SWAP(u); | |
825 | ||
826 | assert(s); | |
827 | assert(f); | |
828 | assert(fds); | |
829 | ||
830 | unit_serialize_item(u, f, "state", swap_state_to_string(s->state)); | |
e1770af8 | 831 | unit_serialize_item(u, f, "result", swap_result_to_string(s->result)); |
e04aad61 LP |
832 | |
833 | if (s->control_pid > 0) | |
834 | unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) s->control_pid); | |
835 | ||
836 | if (s->control_command_id >= 0) | |
837 | unit_serialize_item(u, f, "control-command", swap_exec_command_to_string(s->control_command_id)); | |
07b0b134 | 838 | |
c17ec25e MS |
839 | exec_context_serialize(&s->exec_context, UNIT(s), f); |
840 | ||
07b0b134 ML |
841 | return 0; |
842 | } | |
843 | ||
844 | static int swap_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
845 | Swap *s = SWAP(u); | |
846 | ||
847 | assert(s); | |
848 | assert(fds); | |
849 | ||
850 | if (streq(key, "state")) { | |
851 | SwapState state; | |
852 | ||
646134dc ZJS |
853 | state = swap_state_from_string(value); |
854 | if (state < 0) | |
66870f90 | 855 | log_debug_unit(u->id, "Failed to parse state value %s", value); |
07b0b134 ML |
856 | else |
857 | s->deserialized_state = state; | |
e1770af8 LP |
858 | } else if (streq(key, "result")) { |
859 | SwapResult f; | |
860 | ||
861 | f = swap_result_from_string(value); | |
862 | if (f < 0) | |
66870f90 | 863 | log_debug_unit(u->id, "Failed to parse result value %s", value); |
e1770af8 LP |
864 | else if (f != SWAP_SUCCESS) |
865 | s->result = f; | |
e04aad61 LP |
866 | } else if (streq(key, "control-pid")) { |
867 | pid_t pid; | |
868 | ||
869 | if (parse_pid(value, &pid) < 0) | |
66870f90 | 870 | log_debug_unit(u->id, "Failed to parse control-pid value %s", value); |
e04aad61 LP |
871 | else |
872 | s->control_pid = pid; | |
873 | ||
874 | } else if (streq(key, "control-command")) { | |
875 | SwapExecCommand id; | |
876 | ||
646134dc ZJS |
877 | id = swap_exec_command_from_string(value); |
878 | if (id < 0) | |
66870f90 | 879 | log_debug_unit(u->id, "Failed to parse exec-command value %s", value); |
e04aad61 LP |
880 | else { |
881 | s->control_command_id = id; | |
882 | s->control_command = s->exec_command + id; | |
883 | } | |
c17ec25e MS |
884 | } else if (streq(key, "tmp-dir")) { |
885 | char *t; | |
886 | ||
887 | t = strdup(value); | |
888 | if (!t) | |
889 | return log_oom(); | |
890 | ||
891 | s->exec_context.tmp_dir = t; | |
892 | } else if (streq(key, "var-tmp-dir")) { | |
893 | char *t; | |
894 | ||
895 | t = strdup(value); | |
896 | if (!t) | |
897 | return log_oom(); | |
e04aad61 | 898 | |
c17ec25e | 899 | s->exec_context.var_tmp_dir = t; |
07b0b134 | 900 | } else |
66870f90 | 901 | log_debug_unit(u->id, "Unknown serialization key '%s'", key); |
07b0b134 ML |
902 | |
903 | return 0; | |
904 | } | |
905 | ||
44a6b1b6 | 906 | _pure_ static UnitActiveState swap_active_state(Unit *u) { |
07b0b134 ML |
907 | assert(u); |
908 | ||
909 | return state_translation_table[SWAP(u)->state]; | |
910 | } | |
911 | ||
44a6b1b6 | 912 | _pure_ static const char *swap_sub_state_to_string(Unit *u) { |
07b0b134 ML |
913 | assert(u); |
914 | ||
915 | return swap_state_to_string(SWAP(u)->state); | |
916 | } | |
917 | ||
44a6b1b6 | 918 | _pure_ static bool swap_check_gc(Unit *u) { |
07b0b134 ML |
919 | Swap *s = SWAP(u); |
920 | ||
921 | assert(s); | |
922 | ||
6b1dc2bd | 923 | return s->from_proc_swaps; |
07b0b134 ML |
924 | } |
925 | ||
e04aad61 LP |
926 | static void swap_sigchld_event(Unit *u, pid_t pid, int code, int status) { |
927 | Swap *s = SWAP(u); | |
e1770af8 | 928 | SwapResult f; |
e04aad61 LP |
929 | |
930 | assert(s); | |
931 | assert(pid >= 0); | |
932 | ||
933 | if (pid != s->control_pid) | |
934 | return; | |
935 | ||
936 | s->control_pid = 0; | |
937 | ||
96342de6 | 938 | if (is_clean_exit(code, status, NULL)) |
e1770af8 LP |
939 | f = SWAP_SUCCESS; |
940 | else if (code == CLD_EXITED) | |
941 | f = SWAP_FAILURE_EXIT_CODE; | |
942 | else if (code == CLD_KILLED) | |
943 | f = SWAP_FAILURE_SIGNAL; | |
944 | else if (code == CLD_DUMPED) | |
945 | f = SWAP_FAILURE_CORE_DUMP; | |
946 | else | |
947 | assert_not_reached("Unknown code"); | |
948 | ||
949 | if (f != SWAP_SUCCESS) | |
950 | s->result = f; | |
e04aad61 LP |
951 | |
952 | if (s->control_command) { | |
6ea832a2 | 953 | exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status); |
e1770af8 | 954 | |
e04aad61 LP |
955 | s->control_command = NULL; |
956 | s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; | |
957 | } | |
958 | ||
66870f90 ZJS |
959 | log_full_unit(f == SWAP_SUCCESS ? LOG_DEBUG : LOG_NOTICE, |
960 | u->id, | |
961 | "%s swap process exited, code=%s status=%i", | |
962 | u->id, sigchld_code_to_string(code), status); | |
e04aad61 LP |
963 | |
964 | switch (s->state) { | |
965 | ||
966 | case SWAP_ACTIVATING: | |
967 | case SWAP_ACTIVATING_SIGTERM: | |
968 | case SWAP_ACTIVATING_SIGKILL: | |
969 | ||
e1770af8 LP |
970 | if (f == SWAP_SUCCESS) |
971 | swap_enter_active(s, f); | |
e04aad61 | 972 | else |
e1770af8 | 973 | swap_enter_dead(s, f); |
e04aad61 LP |
974 | break; |
975 | ||
976 | case SWAP_DEACTIVATING: | |
977 | case SWAP_DEACTIVATING_SIGKILL: | |
978 | case SWAP_DEACTIVATING_SIGTERM: | |
979 | ||
e1770af8 LP |
980 | if (f == SWAP_SUCCESS) |
981 | swap_enter_dead(s, f); | |
e04aad61 | 982 | else |
e1770af8 | 983 | swap_enter_dead(s, f); |
e04aad61 LP |
984 | break; |
985 | ||
986 | default: | |
987 | assert_not_reached("Uh, control process died at wrong time."); | |
988 | } | |
989 | ||
990 | /* Notify clients about changed exit status */ | |
991 | unit_add_to_dbus_queue(u); | |
992 | ||
993 | /* Request a reload of /proc/swaps, so that following units | |
994 | * can follow our state change */ | |
ac155bb8 | 995 | u->manager->request_reload = true; |
e04aad61 LP |
996 | } |
997 | ||
998 | static void swap_timer_event(Unit *u, uint64_t elapsed, Watch *w) { | |
999 | Swap *s = SWAP(u); | |
1000 | ||
1001 | assert(s); | |
1002 | assert(elapsed == 1); | |
1003 | assert(w == &s->timer_watch); | |
1004 | ||
1005 | switch (s->state) { | |
1006 | ||
1007 | case SWAP_ACTIVATING: | |
66870f90 | 1008 | log_warning_unit(u->id, "%s activation timed out. Stopping.", u->id); |
e1770af8 | 1009 | swap_enter_signal(s, SWAP_ACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT); |
e04aad61 LP |
1010 | break; |
1011 | ||
1012 | case SWAP_DEACTIVATING: | |
66870f90 | 1013 | log_warning_unit(u->id, "%s deactivation timed out. Stopping.", u->id); |
e1770af8 | 1014 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT); |
e04aad61 LP |
1015 | break; |
1016 | ||
1017 | case SWAP_ACTIVATING_SIGTERM: | |
4819ff03 | 1018 | if (s->kill_context.send_sigkill) { |
66870f90 | 1019 | log_warning_unit(u->id, "%s activation timed out. Killing.", u->id); |
e1770af8 | 1020 | swap_enter_signal(s, SWAP_ACTIVATING_SIGKILL, SWAP_FAILURE_TIMEOUT); |
ba035df2 | 1021 | } else { |
66870f90 | 1022 | log_warning_unit(u->id, "%s activation timed out. Skipping SIGKILL. Ignoring.", u->id); |
e1770af8 | 1023 | swap_enter_dead(s, SWAP_FAILURE_TIMEOUT); |
ba035df2 | 1024 | } |
e04aad61 LP |
1025 | break; |
1026 | ||
1027 | case SWAP_DEACTIVATING_SIGTERM: | |
4819ff03 | 1028 | if (s->kill_context.send_sigkill) { |
66870f90 | 1029 | log_warning_unit(u->id, "%s deactivation timed out. Killing.", u->id); |
e1770af8 | 1030 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, SWAP_FAILURE_TIMEOUT); |
ba035df2 | 1031 | } else { |
66870f90 | 1032 | log_warning_unit(u->id, "%s deactivation timed out. Skipping SIGKILL. Ignoring.", u->id); |
e1770af8 | 1033 | swap_enter_dead(s, SWAP_FAILURE_TIMEOUT); |
ba035df2 | 1034 | } |
e04aad61 LP |
1035 | break; |
1036 | ||
1037 | case SWAP_ACTIVATING_SIGKILL: | |
1038 | case SWAP_DEACTIVATING_SIGKILL: | |
66870f90 | 1039 | log_warning_unit(u->id, "%s swap process still around after SIGKILL. Ignoring.", u->id); |
e1770af8 | 1040 | swap_enter_dead(s, SWAP_FAILURE_TIMEOUT); |
e04aad61 LP |
1041 | break; |
1042 | ||
1043 | default: | |
1044 | assert_not_reached("Timeout at wrong time."); | |
1045 | } | |
1046 | } | |
1047 | ||
1048 | static int swap_load_proc_swaps(Manager *m, bool set_flags) { | |
1049 | unsigned i; | |
1050 | int r = 0; | |
1051 | ||
1052 | assert(m); | |
1053 | ||
07b0b134 | 1054 | rewind(m->proc_swaps); |
bab45044 | 1055 | |
4e85aff4 | 1056 | (void) fscanf(m->proc_swaps, "%*s %*s %*s %*s %*s\n"); |
07b0b134 | 1057 | |
e04aad61 | 1058 | for (i = 1;; i++) { |
07b0b134 ML |
1059 | char *dev = NULL, *d; |
1060 | int prio = 0, k; | |
1061 | ||
646134dc ZJS |
1062 | k = fscanf(m->proc_swaps, |
1063 | "%ms " /* device/file */ | |
1064 | "%*s " /* type of swap */ | |
1065 | "%*s " /* swap size */ | |
1066 | "%*s " /* used */ | |
1067 | "%i\n", /* priority */ | |
1068 | &dev, &prio); | |
1069 | if (k != 2) { | |
07b0b134 | 1070 | if (k == EOF) |
4e85aff4 | 1071 | break; |
07b0b134 | 1072 | |
646134dc | 1073 | log_warning("Failed to parse /proc/swaps:%u", i); |
07b0b134 | 1074 | free(dev); |
e04aad61 | 1075 | continue; |
07b0b134 | 1076 | } |
07b0b134 | 1077 | |
4e85aff4 | 1078 | d = cunescape(dev); |
07b0b134 | 1079 | free(dev); |
4e85aff4 LP |
1080 | |
1081 | if (!d) | |
1082 | return -ENOMEM; | |
1083 | ||
e04aad61 | 1084 | k = swap_process_new_swap(m, d, prio, set_flags); |
07b0b134 ML |
1085 | free(d); |
1086 | ||
1087 | if (k < 0) | |
e04aad61 | 1088 | r = k; |
07b0b134 ML |
1089 | } |
1090 | ||
e04aad61 LP |
1091 | return r; |
1092 | } | |
1093 | ||
1094 | int swap_dispatch_reload(Manager *m) { | |
4e434314 | 1095 | /* This function should go as soon as the kernel properly notifies us */ |
e04aad61 LP |
1096 | |
1097 | if (_likely_(!m->request_reload)) | |
1098 | return 0; | |
1099 | ||
1100 | m->request_reload = false; | |
1101 | ||
4e434314 LP |
1102 | return swap_fd_event(m, EPOLLPRI); |
1103 | } | |
1104 | ||
1105 | int swap_fd_event(Manager *m, int events) { | |
595ed347 | 1106 | Unit *u; |
4e434314 LP |
1107 | int r; |
1108 | ||
1109 | assert(m); | |
1110 | assert(events & EPOLLPRI); | |
1111 | ||
646134dc ZJS |
1112 | r = swap_load_proc_swaps(m, true); |
1113 | if (r < 0) { | |
e04aad61 LP |
1114 | log_error("Failed to reread /proc/swaps: %s", strerror(-r)); |
1115 | ||
1116 | /* Reset flags, just in case, for late calls */ | |
595ed347 MS |
1117 | LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) { |
1118 | Swap *swap = SWAP(u); | |
e04aad61 LP |
1119 | |
1120 | swap->is_active = swap->just_activated = false; | |
1121 | } | |
1122 | ||
1123 | return 0; | |
1124 | } | |
1125 | ||
1126 | manager_dispatch_load_queue(m); | |
1127 | ||
595ed347 MS |
1128 | LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) { |
1129 | Swap *swap = SWAP(u); | |
e04aad61 LP |
1130 | |
1131 | if (!swap->is_active) { | |
1132 | /* This has just been deactivated */ | |
1133 | ||
1134 | swap->from_proc_swaps = false; | |
1135 | swap_unset_proc_swaps(swap); | |
1136 | ||
1137 | switch (swap->state) { | |
1138 | ||
1139 | case SWAP_ACTIVE: | |
e1770af8 | 1140 | swap_enter_dead(swap, SWAP_SUCCESS); |
e04aad61 LP |
1141 | break; |
1142 | ||
1143 | default: | |
1144 | swap_set_state(swap, swap->state); | |
1145 | break; | |
1146 | } | |
1147 | ||
1148 | } else if (swap->just_activated) { | |
1149 | ||
1150 | /* New swap entry */ | |
1151 | ||
1152 | switch (swap->state) { | |
1153 | ||
1154 | case SWAP_DEAD: | |
1155 | case SWAP_FAILED: | |
e1770af8 | 1156 | swap_enter_active(swap, SWAP_SUCCESS); |
e04aad61 LP |
1157 | break; |
1158 | ||
1159 | default: | |
1160 | /* Nothing really changed, but let's | |
1161 | * issue an notification call | |
1162 | * nonetheless, in case somebody is | |
1163 | * waiting for this. */ | |
1164 | swap_set_state(swap, swap->state); | |
1165 | break; | |
1166 | } | |
1167 | } | |
1168 | ||
1169 | /* Reset the flags for later calls */ | |
1170 | swap->is_active = swap->just_activated = false; | |
1171 | } | |
1172 | ||
1173 | return 1; | |
1174 | } | |
1175 | ||
1176 | static Unit *swap_following(Unit *u) { | |
1177 | Swap *s = SWAP(u); | |
1178 | Swap *other, *first = NULL; | |
1179 | ||
1180 | assert(s); | |
1181 | ||
1182 | if (streq_ptr(s->what, s->parameters_proc_swaps.what)) | |
1183 | return NULL; | |
1184 | ||
1185 | /* Make everybody follow the unit that's named after the swap | |
1186 | * device in the kernel */ | |
1187 | ||
1188 | LIST_FOREACH_AFTER(same_proc_swaps, other, s) | |
1189 | if (streq_ptr(other->what, other->parameters_proc_swaps.what)) | |
1190 | return UNIT(other); | |
1191 | ||
1192 | LIST_FOREACH_BEFORE(same_proc_swaps, other, s) { | |
1193 | if (streq_ptr(other->what, other->parameters_proc_swaps.what)) | |
1194 | return UNIT(other); | |
1195 | ||
1196 | first = other; | |
1197 | } | |
1198 | ||
1199 | return UNIT(first); | |
07b0b134 ML |
1200 | } |
1201 | ||
6210e7fc LP |
1202 | static int swap_following_set(Unit *u, Set **_set) { |
1203 | Swap *s = SWAP(u); | |
1204 | Swap *other; | |
1205 | Set *set; | |
1206 | int r; | |
1207 | ||
1208 | assert(s); | |
1209 | assert(_set); | |
1210 | ||
1211 | if (LIST_JUST_US(same_proc_swaps, s)) { | |
1212 | *_set = NULL; | |
1213 | return 0; | |
1214 | } | |
1215 | ||
1216 | if (!(set = set_new(NULL, NULL))) | |
1217 | return -ENOMEM; | |
1218 | ||
1219 | LIST_FOREACH_AFTER(same_proc_swaps, other, s) | |
1220 | if ((r = set_put(set, other)) < 0) | |
1221 | goto fail; | |
1222 | ||
1223 | LIST_FOREACH_BEFORE(same_proc_swaps, other, s) | |
1224 | if ((r = set_put(set, other)) < 0) | |
1225 | goto fail; | |
1226 | ||
1227 | *_set = set; | |
1228 | return 1; | |
1229 | ||
1230 | fail: | |
1231 | set_free(set); | |
1232 | return r; | |
1233 | } | |
1234 | ||
07b0b134 ML |
1235 | static void swap_shutdown(Manager *m) { |
1236 | assert(m); | |
1237 | ||
1238 | if (m->proc_swaps) { | |
1239 | fclose(m->proc_swaps); | |
1240 | m->proc_swaps = NULL; | |
1241 | } | |
e04aad61 LP |
1242 | |
1243 | hashmap_free(m->swaps_by_proc_swaps); | |
1244 | m->swaps_by_proc_swaps = NULL; | |
07b0b134 ML |
1245 | } |
1246 | ||
07b0b134 ML |
1247 | static int swap_enumerate(Manager *m) { |
1248 | int r; | |
1249 | assert(m); | |
1250 | ||
4e434314 | 1251 | if (!m->proc_swaps) { |
b92bea5d ZJS |
1252 | struct epoll_event ev = { |
1253 | .events = EPOLLPRI, | |
1254 | .data.ptr = &m->swap_watch, | |
1255 | }; | |
1256 | ||
646134dc ZJS |
1257 | m->proc_swaps = fopen("/proc/swaps", "re"); |
1258 | if (!m->proc_swaps) | |
3f858732 | 1259 | return (errno == ENOENT) ? 0 : -errno; |
07b0b134 | 1260 | |
4e434314 LP |
1261 | m->swap_watch.type = WATCH_SWAP; |
1262 | m->swap_watch.fd = fileno(m->proc_swaps); | |
1263 | ||
4e434314 LP |
1264 | if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->swap_watch.fd, &ev) < 0) |
1265 | return -errno; | |
1266 | } | |
1267 | ||
646134dc ZJS |
1268 | r = swap_load_proc_swaps(m, false); |
1269 | if (r < 0) | |
07b0b134 ML |
1270 | swap_shutdown(m); |
1271 | ||
1272 | return r; | |
1273 | } | |
1274 | ||
fdf20a31 | 1275 | static void swap_reset_failed(Unit *u) { |
5632e374 LP |
1276 | Swap *s = SWAP(u); |
1277 | ||
1278 | assert(s); | |
1279 | ||
fdf20a31 | 1280 | if (s->state == SWAP_FAILED) |
5632e374 | 1281 | swap_set_state(s, SWAP_DEAD); |
e04aad61 | 1282 | |
e1770af8 | 1283 | s->result = SWAP_SUCCESS; |
5632e374 LP |
1284 | } |
1285 | ||
c74f17d9 | 1286 | static int swap_kill(Unit *u, KillWho who, int signo, DBusError *error) { |
814cc562 | 1287 | return unit_kill_common(u, who, signo, -1, SWAP(u)->control_pid, error); |
8a0867d6 LP |
1288 | } |
1289 | ||
5632e374 LP |
1290 | static const char* const swap_state_table[_SWAP_STATE_MAX] = { |
1291 | [SWAP_DEAD] = "dead", | |
e04aad61 | 1292 | [SWAP_ACTIVATING] = "activating", |
5632e374 | 1293 | [SWAP_ACTIVE] = "active", |
e04aad61 LP |
1294 | [SWAP_DEACTIVATING] = "deactivating", |
1295 | [SWAP_ACTIVATING_SIGTERM] = "activating-sigterm", | |
1296 | [SWAP_ACTIVATING_SIGKILL] = "activating-sigkill", | |
1297 | [SWAP_DEACTIVATING_SIGTERM] = "deactivating-sigterm", | |
1298 | [SWAP_DEACTIVATING_SIGKILL] = "deactivating-sigkill", | |
fdf20a31 | 1299 | [SWAP_FAILED] = "failed" |
5632e374 LP |
1300 | }; |
1301 | ||
1302 | DEFINE_STRING_TABLE_LOOKUP(swap_state, SwapState); | |
1303 | ||
e04aad61 LP |
1304 | static const char* const swap_exec_command_table[_SWAP_EXEC_COMMAND_MAX] = { |
1305 | [SWAP_EXEC_ACTIVATE] = "ExecActivate", | |
1306 | [SWAP_EXEC_DEACTIVATE] = "ExecDeactivate", | |
1307 | }; | |
1308 | ||
1309 | DEFINE_STRING_TABLE_LOOKUP(swap_exec_command, SwapExecCommand); | |
1310 | ||
e1770af8 LP |
1311 | static const char* const swap_result_table[_SWAP_RESULT_MAX] = { |
1312 | [SWAP_SUCCESS] = "success", | |
1313 | [SWAP_FAILURE_RESOURCES] = "resources", | |
1314 | [SWAP_FAILURE_TIMEOUT] = "timeout", | |
1315 | [SWAP_FAILURE_EXIT_CODE] = "exit-code", | |
1316 | [SWAP_FAILURE_SIGNAL] = "signal", | |
1317 | [SWAP_FAILURE_CORE_DUMP] = "core-dump" | |
1318 | }; | |
1319 | ||
1320 | DEFINE_STRING_TABLE_LOOKUP(swap_result, SwapResult); | |
1321 | ||
07b0b134 | 1322 | const UnitVTable swap_vtable = { |
7d17cfbc | 1323 | .object_size = sizeof(Swap), |
3ef63c31 | 1324 | |
f975e971 LP |
1325 | .sections = |
1326 | "Unit\0" | |
1327 | "Swap\0" | |
1328 | "Install\0", | |
07b0b134 | 1329 | |
4ad49000 | 1330 | .private_section = "Swap", |
71645aca | 1331 | .exec_context_offset = offsetof(Swap, exec_context), |
4ad49000 | 1332 | .cgroup_context_offset = offsetof(Swap, cgroup_context), |
71645aca | 1333 | |
e04aad61 | 1334 | .no_alias = true, |
07b0b134 ML |
1335 | .no_instances = true, |
1336 | ||
4e85aff4 | 1337 | .init = swap_init, |
07b0b134 | 1338 | .load = swap_load, |
6e620bec | 1339 | .done = swap_done, |
07b0b134 ML |
1340 | |
1341 | .coldplug = swap_coldplug, | |
1342 | ||
1343 | .dump = swap_dump, | |
1344 | ||
1345 | .start = swap_start, | |
1346 | .stop = swap_stop, | |
1347 | ||
8a0867d6 LP |
1348 | .kill = swap_kill, |
1349 | ||
07b0b134 ML |
1350 | .serialize = swap_serialize, |
1351 | .deserialize_item = swap_deserialize_item, | |
1352 | ||
1353 | .active_state = swap_active_state, | |
1354 | .sub_state_to_string = swap_sub_state_to_string, | |
1355 | ||
1356 | .check_gc = swap_check_gc, | |
1357 | ||
e04aad61 LP |
1358 | .sigchld_event = swap_sigchld_event, |
1359 | .timer_event = swap_timer_event, | |
1360 | ||
1361 | .reset_failed = swap_reset_failed, | |
1362 | ||
c4e2ceae | 1363 | .bus_interface = "org.freedesktop.systemd1.Swap", |
07b0b134 | 1364 | .bus_message_handler = bus_swap_message_handler, |
c4e2ceae | 1365 | .bus_invalidating_properties = bus_swap_invalidating_properties, |
07b0b134 | 1366 | |
e04aad61 | 1367 | .following = swap_following, |
6210e7fc | 1368 | .following_set = swap_following_set, |
5632e374 | 1369 | |
6e620bec | 1370 | .enumerate = swap_enumerate, |
c6918296 MS |
1371 | .shutdown = swap_shutdown, |
1372 | ||
1373 | .status_message_formats = { | |
1374 | .starting_stopping = { | |
1375 | [0] = "Activating swap %s...", | |
1376 | [1] = "Deactivating swap %s...", | |
1377 | }, | |
1378 | .finished_start_job = { | |
1379 | [JOB_DONE] = "Activated swap %s.", | |
1380 | [JOB_FAILED] = "Failed to activate swap %s.", | |
1381 | [JOB_DEPENDENCY] = "Dependency failed for %s.", | |
1382 | [JOB_TIMEOUT] = "Timed out activating swap %s.", | |
1383 | }, | |
1384 | .finished_stop_job = { | |
1385 | [JOB_DONE] = "Deactivated swap %s.", | |
1386 | [JOB_FAILED] = "Failed deactivating swap %s.", | |
1387 | [JOB_TIMEOUT] = "Timed out deactivating swap %s.", | |
1388 | }, | |
1389 | }, | |
07b0b134 | 1390 | }; |