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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" |
5bcb0f2b | 43 | #include "udev-util.h" |
07b0b134 ML |
44 | |
45 | static const UnitActiveState state_translation_table[_SWAP_STATE_MAX] = { | |
46 | [SWAP_DEAD] = UNIT_INACTIVE, | |
e04aad61 | 47 | [SWAP_ACTIVATING] = UNIT_ACTIVATING, |
5bcb0f2b | 48 | [SWAP_ACTIVATING_DONE] = UNIT_ACTIVE, |
07b0b134 | 49 | [SWAP_ACTIVE] = UNIT_ACTIVE, |
e04aad61 LP |
50 | [SWAP_DEACTIVATING] = UNIT_DEACTIVATING, |
51 | [SWAP_ACTIVATING_SIGTERM] = UNIT_DEACTIVATING, | |
52 | [SWAP_ACTIVATING_SIGKILL] = UNIT_DEACTIVATING, | |
53 | [SWAP_DEACTIVATING_SIGTERM] = UNIT_DEACTIVATING, | |
54 | [SWAP_DEACTIVATING_SIGKILL] = UNIT_DEACTIVATING, | |
fdf20a31 | 55 | [SWAP_FAILED] = UNIT_FAILED |
07b0b134 ML |
56 | }; |
57 | ||
718db961 LP |
58 | static int swap_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata); |
59 | static int swap_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata); | |
60 | ||
e04aad61 | 61 | static void swap_unset_proc_swaps(Swap *s) { |
df326b84 | 62 | Hashmap *swaps; |
5bcb0f2b | 63 | Swap *first; |
e04aad61 LP |
64 | |
65 | assert(s); | |
66 | ||
67 | if (!s->parameters_proc_swaps.what) | |
68 | return; | |
69 | ||
70 | /* Remove this unit from the chain of swaps which share the | |
71 | * same kernel swap device. */ | |
df326b84 ZJS |
72 | swaps = UNIT(s)->manager->swaps_by_proc_swaps; |
73 | first = hashmap_get(swaps, s->parameters_proc_swaps.what); | |
71fda00f | 74 | LIST_REMOVE(same_proc_swaps, first, s); |
e04aad61 LP |
75 | |
76 | if (first) | |
5bcb0f2b | 77 | hashmap_remove_and_replace(swaps, s->parameters_proc_swaps.what, first->parameters_proc_swaps.what, first); |
e04aad61 | 78 | else |
df326b84 | 79 | hashmap_remove(swaps, s->parameters_proc_swaps.what); |
e04aad61 LP |
80 | |
81 | free(s->parameters_proc_swaps.what); | |
82 | s->parameters_proc_swaps.what = NULL; | |
5bcb0f2b LP |
83 | |
84 | s->from_proc_swaps = false; | |
e04aad61 LP |
85 | } |
86 | ||
f6cebb3b | 87 | static void swap_init(Unit *u) { |
6e620bec LP |
88 | Swap *s = SWAP(u); |
89 | ||
90 | assert(s); | |
1124fe6f | 91 | assert(UNIT(s)->load_state == UNIT_STUB); |
6e620bec | 92 | |
1f19a534 | 93 | s->timeout_usec = u->manager->default_timeout_start_usec; |
e04aad61 LP |
94 | |
95 | exec_context_init(&s->exec_context); | |
ac155bb8 MS |
96 | s->exec_context.std_output = u->manager->default_std_output; |
97 | s->exec_context.std_error = u->manager->default_std_error; | |
4819ff03 | 98 | kill_context_init(&s->kill_context); |
4ad49000 | 99 | cgroup_context_init(&s->cgroup_context); |
e04aad61 | 100 | |
6b1dc2bd | 101 | s->parameters_proc_swaps.priority = s->parameters_fragment.priority = -1; |
e04aad61 | 102 | |
e1770af8 | 103 | s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; |
c8f4d764 | 104 | |
5bcb0f2b | 105 | u->ignore_on_isolate = true; |
e04aad61 LP |
106 | } |
107 | ||
108 | static void swap_unwatch_control_pid(Swap *s) { | |
109 | assert(s); | |
110 | ||
111 | if (s->control_pid <= 0) | |
112 | return; | |
113 | ||
114 | unit_unwatch_pid(UNIT(s), s->control_pid); | |
115 | s->control_pid = 0; | |
6e620bec LP |
116 | } |
117 | ||
4e85aff4 LP |
118 | static void swap_done(Unit *u) { |
119 | Swap *s = SWAP(u); | |
07b0b134 | 120 | |
4e85aff4 | 121 | assert(s); |
07b0b134 | 122 | |
e04aad61 LP |
123 | swap_unset_proc_swaps(s); |
124 | ||
4e85aff4 | 125 | free(s->what); |
e04aad61 LP |
126 | s->what = NULL; |
127 | ||
4e85aff4 | 128 | free(s->parameters_fragment.what); |
6b1dc2bd | 129 | s->parameters_fragment.what = NULL; |
e04aad61 | 130 | |
c17ec25e | 131 | exec_context_done(&s->exec_context, manager_is_reloading_or_reexecuting(u->manager)); |
e04aad61 LP |
132 | exec_command_done_array(s->exec_command, _SWAP_EXEC_COMMAND_MAX); |
133 | s->control_command = NULL; | |
134 | ||
4ad49000 LP |
135 | cgroup_context_done(&s->cgroup_context); |
136 | ||
e04aad61 LP |
137 | swap_unwatch_control_pid(s); |
138 | ||
718db961 LP |
139 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
140 | } | |
141 | ||
142 | static int swap_arm_timer(Swap *s) { | |
143 | int r; | |
144 | ||
145 | assert(s); | |
146 | ||
147 | if (s->timeout_usec <= 0) { | |
148 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); | |
149 | return 0; | |
150 | } | |
151 | ||
152 | if (s->timer_event_source) { | |
153 | r = sd_event_source_set_time(s->timer_event_source, now(CLOCK_MONOTONIC) + s->timeout_usec); | |
154 | if (r < 0) | |
155 | return r; | |
156 | ||
157 | return sd_event_source_set_enabled(s->timer_event_source, SD_EVENT_ONESHOT); | |
158 | } | |
159 | ||
160 | return sd_event_add_monotonic(UNIT(s)->manager->event, now(CLOCK_MONOTONIC) + s->timeout_usec, 0, swap_dispatch_timer, s, &s->timer_event_source); | |
07b0b134 ML |
161 | } |
162 | ||
173a8d04 LP |
163 | static int swap_add_device_links(Swap *s) { |
164 | SwapParameters *p; | |
165 | ||
166 | assert(s); | |
167 | ||
168 | if (!s->what) | |
169 | return 0; | |
170 | ||
171 | if (s->from_fragment) | |
172 | p = &s->parameters_fragment; | |
173a8d04 LP |
173 | else |
174 | return 0; | |
175 | ||
cfcfd4ae | 176 | if (is_device_path(s->what)) |
5bcb0f2b | 177 | return unit_add_node_link(UNIT(s), s->what, !p->noauto && UNIT(s)->manager->running_as == SYSTEMD_SYSTEM); |
cfcfd4ae LP |
178 | else |
179 | /* File based swap devices need to be ordered after | |
2b93b027 | 180 | * systemd-remount-fs.service, since they might need a |
cfcfd4ae | 181 | * writable file system. */ |
2b93b027 | 182 | return unit_add_dependency_by_name(UNIT(s), UNIT_AFTER, SPECIAL_REMOUNT_FS_SERVICE, NULL, true); |
173a8d04 LP |
183 | } |
184 | ||
2edd4434 | 185 | static int swap_add_default_dependencies(Swap *s) { |
64347fc2 | 186 | bool nofail = false, noauto = false; |
2edd4434 LP |
187 | int r; |
188 | ||
189 | assert(s); | |
190 | ||
67445f4e | 191 | if (UNIT(s)->manager->running_as != SYSTEMD_SYSTEM) |
6b1dc2bd | 192 | return 0; |
2edd4434 | 193 | |
c0387ebf LP |
194 | if (detect_container(NULL) > 0) |
195 | return 0; | |
196 | ||
6b1dc2bd LP |
197 | r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true); |
198 | if (r < 0) | |
199 | return r; | |
2edd4434 | 200 | |
64347fc2 TG |
201 | if (s->from_fragment) { |
202 | SwapParameters *p = &s->parameters_fragment; | |
203 | ||
204 | nofail = p->nofail; | |
205 | noauto = p->noauto; | |
206 | } | |
207 | ||
208 | if (!noauto) { | |
4e82fe52 | 209 | if (nofail) |
5bcb0f2b | 210 | r = unit_add_dependency_by_name_inverse(UNIT(s), UNIT_WANTS, SPECIAL_SWAP_TARGET, NULL, true); |
4e82fe52 | 211 | else |
5bcb0f2b | 212 | r = unit_add_two_dependencies_by_name_inverse(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SWAP_TARGET, NULL, true); |
64347fc2 TG |
213 | if (r < 0) |
214 | return r; | |
215 | } | |
216 | ||
2edd4434 LP |
217 | return 0; |
218 | } | |
219 | ||
4e85aff4 LP |
220 | static int swap_verify(Swap *s) { |
221 | bool b; | |
7fd1b19b | 222 | _cleanup_free_ char *e = NULL; |
4e85aff4 | 223 | |
1124fe6f | 224 | if (UNIT(s)->load_state != UNIT_LOADED) |
5bcb0f2b | 225 | return 0; |
4e85aff4 | 226 | |
170ca19e | 227 | e = unit_name_from_path(s->what, ".swap"); |
5bcb0f2b | 228 | if (!e) |
170ca19e | 229 | return log_oom(); |
4e85aff4 LP |
230 | |
231 | b = unit_has_name(UNIT(s), e); | |
4e85aff4 | 232 | if (!b) { |
5bcb0f2b | 233 | log_error_unit(UNIT(s)->id, "%s: Value of \"What\" and unit name do not match, not loading.", 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) { |
5bcb0f2b | 238 | log_error_unit(UNIT(s)->id, "%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing to load.", UNIT(s)->id); |
e04aad61 LP |
239 | return -EINVAL; |
240 | } | |
241 | ||
4e85aff4 LP |
242 | return 0; |
243 | } | |
244 | ||
07b0b134 ML |
245 | static int swap_load(Unit *u) { |
246 | int r; | |
247 | Swap *s = SWAP(u); | |
248 | ||
249 | assert(s); | |
ac155bb8 | 250 | assert(u->load_state == UNIT_STUB); |
07b0b134 ML |
251 | |
252 | /* Load a .swap file */ | |
646134dc ZJS |
253 | r = unit_load_fragment_and_dropin_optional(u); |
254 | if (r < 0) | |
07b0b134 ML |
255 | return r; |
256 | ||
ac155bb8 | 257 | if (u->load_state == UNIT_LOADED) { |
646134dc ZJS |
258 | r = unit_add_exec_dependencies(u, &s->exec_context); |
259 | if (r < 0) | |
27abbe82 | 260 | return r; |
4e85aff4 | 261 | |
1124fe6f | 262 | if (UNIT(s)->fragment_path) |
4e85aff4 LP |
263 | s->from_fragment = true; |
264 | ||
265 | if (!s->what) { | |
266 | if (s->parameters_fragment.what) | |
267 | s->what = strdup(s->parameters_fragment.what); | |
4e85aff4 LP |
268 | else if (s->parameters_proc_swaps.what) |
269 | s->what = strdup(s->parameters_proc_swaps.what); | |
270 | else | |
ac155bb8 | 271 | s->what = unit_name_to_path(u->id); |
4e85aff4 LP |
272 | |
273 | if (!s->what) | |
07b0b134 | 274 | return -ENOMEM; |
4e85aff4 | 275 | } |
07b0b134 ML |
276 | |
277 | path_kill_slashes(s->what); | |
278 | ||
5bcb0f2b LP |
279 | if (!UNIT(s)->description) { |
280 | r = unit_set_description(u, s->what); | |
281 | if (r < 0) | |
4e85aff4 | 282 | return r; |
5bcb0f2b | 283 | } |
4e85aff4 | 284 | |
a57f7e2c | 285 | r = unit_require_mounts_for(UNIT(s), s->what); |
646134dc | 286 | if (r < 0) |
07b0b134 ML |
287 | return r; |
288 | ||
a57f7e2c | 289 | r = swap_add_device_links(s); |
646134dc | 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 | ||
7fd1b19b | 320 | _cleanup_free_ char *e = NULL; |
2c7c6144 | 321 | bool delete = false; |
5bcb0f2b | 322 | Unit *u = NULL; |
07b0b134 | 323 | int r; |
4e85aff4 | 324 | SwapParameters *p; |
6b1dc2bd | 325 | Swap *first; |
4e85aff4 LP |
326 | |
327 | assert(m); | |
328 | assert(what); | |
6b1dc2bd | 329 | assert(what_proc_swaps); |
07b0b134 | 330 | |
7d17cfbc MS |
331 | e = unit_name_from_path(what, ".swap"); |
332 | if (!e) | |
170ca19e | 333 | return log_oom(); |
07b0b134 | 334 | |
e04aad61 LP |
335 | u = manager_get_unit(m, e); |
336 | ||
6b1dc2bd | 337 | if (u && |
e04aad61 LP |
338 | SWAP(u)->from_proc_swaps && |
339 | !path_equal(SWAP(u)->parameters_proc_swaps.what, what_proc_swaps)) | |
340 | return -EEXIST; | |
4e85aff4 LP |
341 | |
342 | if (!u) { | |
07b0b134 ML |
343 | delete = true; |
344 | ||
7d17cfbc | 345 | u = unit_new(m, sizeof(Swap)); |
170ca19e ZJS |
346 | if (!u) |
347 | return log_oom(); | |
e04aad61 | 348 | |
7d17cfbc MS |
349 | r = unit_add_name(u, e); |
350 | if (r < 0) | |
e04aad61 LP |
351 | goto fail; |
352 | ||
7d17cfbc MS |
353 | SWAP(u)->what = strdup(what); |
354 | if (!SWAP(u)->what) { | |
646134dc | 355 | r = log_oom(); |
e04aad61 LP |
356 | goto fail; |
357 | } | |
358 | ||
359 | unit_add_to_load_queue(u); | |
4e85aff4 LP |
360 | } else |
361 | delete = false; | |
07b0b134 | 362 | |
6b1dc2bd | 363 | p = &SWAP(u)->parameters_proc_swaps; |
07b0b134 | 364 | |
6b1dc2bd | 365 | if (!p->what) { |
5bcb0f2b LP |
366 | p->what = strdup(what_proc_swaps); |
367 | if (!p->what) { | |
368 | r = -ENOMEM; | |
6b1dc2bd LP |
369 | goto fail; |
370 | } | |
e04aad61 | 371 | |
5bcb0f2b LP |
372 | r = hashmap_ensure_allocated(&m->swaps_by_proc_swaps, string_hash_func, string_compare_func); |
373 | if (r < 0) | |
374 | goto fail; | |
e04aad61 | 375 | |
5bcb0f2b | 376 | first = hashmap_get(m->swaps_by_proc_swaps, p->what); |
71fda00f | 377 | LIST_PREPEND(same_proc_swaps, first, SWAP(u)); |
e04aad61 | 378 | |
5bcb0f2b | 379 | r = hashmap_replace(m->swaps_by_proc_swaps, p->what, first); |
646134dc | 380 | if (r < 0) |
e04aad61 | 381 | goto fail; |
6b1dc2bd | 382 | } |
e04aad61 | 383 | |
6b1dc2bd LP |
384 | if (set_flags) { |
385 | SWAP(u)->is_active = true; | |
386 | SWAP(u)->just_activated = !SWAP(u)->from_proc_swaps; | |
4e85aff4 | 387 | } |
07b0b134 | 388 | |
6b1dc2bd LP |
389 | SWAP(u)->from_proc_swaps = true; |
390 | ||
4e85aff4 LP |
391 | p->priority = priority; |
392 | p->noauto = noauto; | |
173a8d04 | 393 | p->nofail = nofail; |
07b0b134 | 394 | |
4e85aff4 | 395 | unit_add_to_dbus_queue(u); |
07b0b134 | 396 | |
07b0b134 ML |
397 | return 0; |
398 | ||
399 | fail: | |
66870f90 | 400 | log_warning_unit(e, "Failed to load swap unit: %s", strerror(-r)); |
e04aad61 | 401 | |
4e85aff4 | 402 | if (delete && u) |
07b0b134 ML |
403 | unit_free(u); |
404 | ||
4e85aff4 | 405 | return r; |
07b0b134 ML |
406 | } |
407 | ||
e04aad61 | 408 | static int swap_process_new_swap(Manager *m, const char *device, int prio, bool set_flags) { |
5bcb0f2b LP |
409 | _cleanup_udev_device_unref_ struct udev_device *d = NULL; |
410 | struct udev_list_entry *item = NULL, *first = NULL; | |
411 | const char *dn; | |
e04aad61 | 412 | struct stat st; |
5bcb0f2b | 413 | int r; |
e04aad61 LP |
414 | |
415 | assert(m); | |
416 | ||
5bcb0f2b LP |
417 | r = swap_add_one(m, device, device, prio, false, false, set_flags); |
418 | if (r < 0) | |
419 | return r; | |
e04aad61 | 420 | |
5bcb0f2b LP |
421 | /* If this is a block device, then let's add duplicates for |
422 | * all other names of this block device */ | |
423 | if (stat(device, &st) < 0 || !S_ISBLK(st.st_mode)) | |
424 | return 0; | |
e04aad61 | 425 | |
5bcb0f2b LP |
426 | d = udev_device_new_from_devnum(m->udev, 'b', st.st_rdev); |
427 | if (!d) | |
428 | return 0; | |
e04aad61 | 429 | |
5bcb0f2b LP |
430 | /* Add the main device node */ |
431 | dn = udev_device_get_devnode(d); | |
432 | if (dn && !streq(dn, device)) | |
433 | swap_add_one(m, dn, device, prio, false, false, set_flags); | |
e04aad61 | 434 | |
5bcb0f2b LP |
435 | /* Add additional units for all symlinks */ |
436 | first = udev_device_get_devlinks_list_entry(d); | |
437 | udev_list_entry_foreach(item, first) { | |
438 | const char *p; | |
e04aad61 | 439 | |
5bcb0f2b LP |
440 | /* Don't bother with the /dev/block links */ |
441 | p = udev_list_entry_get_name(item); | |
e04aad61 | 442 | |
5bcb0f2b LP |
443 | if (streq(p, device)) |
444 | continue; | |
e04aad61 | 445 | |
5bcb0f2b LP |
446 | if (path_startswith(p, "/dev/block/")) |
447 | continue; | |
e04aad61 | 448 | |
5bcb0f2b LP |
449 | if (stat(p, &st) >= 0) |
450 | if (!S_ISBLK(st.st_mode) || | |
451 | st.st_rdev != udev_device_get_devnum(d)) | |
452 | continue; | |
e04aad61 | 453 | |
5bcb0f2b | 454 | swap_add_one(m, p, device, prio, false, false, set_flags); |
e04aad61 LP |
455 | } |
456 | ||
e04aad61 LP |
457 | return r; |
458 | } | |
459 | ||
07b0b134 ML |
460 | static void swap_set_state(Swap *s, SwapState state) { |
461 | SwapState old_state; | |
e04aad61 | 462 | |
07b0b134 ML |
463 | assert(s); |
464 | ||
465 | old_state = s->state; | |
466 | s->state = state; | |
467 | ||
e04aad61 LP |
468 | if (state != SWAP_ACTIVATING && |
469 | state != SWAP_ACTIVATING_SIGTERM && | |
470 | state != SWAP_ACTIVATING_SIGKILL && | |
5bcb0f2b | 471 | state != SWAP_ACTIVATING_DONE && |
e04aad61 LP |
472 | state != SWAP_DEACTIVATING && |
473 | state != SWAP_DEACTIVATING_SIGTERM && | |
474 | state != SWAP_DEACTIVATING_SIGKILL) { | |
718db961 | 475 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
e04aad61 LP |
476 | swap_unwatch_control_pid(s); |
477 | s->control_command = NULL; | |
478 | s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; | |
479 | } | |
480 | ||
07b0b134 | 481 | if (state != old_state) |
66870f90 ZJS |
482 | log_debug_unit(UNIT(s)->id, |
483 | "%s changed %s -> %s", | |
484 | UNIT(s)->id, | |
485 | swap_state_to_string(old_state), | |
486 | swap_state_to_string(state)); | |
07b0b134 | 487 | |
5bcb0f2b | 488 | unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], true); |
07b0b134 ML |
489 | } |
490 | ||
491 | static int swap_coldplug(Unit *u) { | |
492 | Swap *s = SWAP(u); | |
493 | SwapState new_state = SWAP_DEAD; | |
e04aad61 | 494 | int r; |
07b0b134 ML |
495 | |
496 | assert(s); | |
497 | assert(s->state == SWAP_DEAD); | |
498 | ||
499 | if (s->deserialized_state != s->state) | |
500 | new_state = s->deserialized_state; | |
4e85aff4 | 501 | else if (s->from_proc_swaps) |
07b0b134 ML |
502 | new_state = SWAP_ACTIVE; |
503 | ||
5bcb0f2b LP |
504 | if (new_state == s->state) |
505 | return 0; | |
e04aad61 | 506 | |
5bcb0f2b LP |
507 | if (new_state == SWAP_ACTIVATING || |
508 | new_state == SWAP_ACTIVATING_SIGTERM || | |
509 | new_state == SWAP_ACTIVATING_SIGKILL || | |
510 | new_state == SWAP_ACTIVATING_DONE || | |
511 | new_state == SWAP_DEACTIVATING || | |
512 | new_state == SWAP_DEACTIVATING_SIGTERM || | |
513 | new_state == SWAP_DEACTIVATING_SIGKILL) { | |
e04aad61 | 514 | |
5bcb0f2b LP |
515 | if (s->control_pid <= 0) |
516 | return -EBADMSG; | |
e04aad61 | 517 | |
5bcb0f2b LP |
518 | r = unit_watch_pid(UNIT(s), s->control_pid); |
519 | if (r < 0) | |
520 | return r; | |
e04aad61 | 521 | |
5bcb0f2b LP |
522 | r = swap_arm_timer(s); |
523 | if (r < 0) | |
524 | return r; | |
e04aad61 | 525 | } |
07b0b134 | 526 | |
5bcb0f2b | 527 | swap_set_state(s, new_state); |
07b0b134 ML |
528 | return 0; |
529 | } | |
530 | ||
531 | static void swap_dump(Unit *u, FILE *f, const char *prefix) { | |
532 | Swap *s = SWAP(u); | |
4e85aff4 | 533 | SwapParameters *p; |
07b0b134 ML |
534 | |
535 | assert(s); | |
4e85aff4 LP |
536 | assert(f); |
537 | ||
538 | if (s->from_proc_swaps) | |
539 | p = &s->parameters_proc_swaps; | |
540 | else if (s->from_fragment) | |
541 | p = &s->parameters_fragment; | |
b6bfc7bb LP |
542 | else |
543 | p = NULL; | |
07b0b134 ML |
544 | |
545 | fprintf(f, | |
4e85aff4 | 546 | "%sSwap State: %s\n" |
e1770af8 | 547 | "%sResult: %s\n" |
07b0b134 | 548 | "%sWhat: %s\n" |
4e85aff4 LP |
549 | "%sFrom /proc/swaps: %s\n" |
550 | "%sFrom fragment: %s\n", | |
07b0b134 | 551 | prefix, swap_state_to_string(s->state), |
e1770af8 | 552 | prefix, swap_result_to_string(s->result), |
07b0b134 | 553 | prefix, s->what, |
4e85aff4 LP |
554 | prefix, yes_no(s->from_proc_swaps), |
555 | prefix, yes_no(s->from_fragment)); | |
e04aad61 | 556 | |
b6bfc7bb LP |
557 | if (p) |
558 | fprintf(f, | |
559 | "%sPriority: %i\n" | |
560 | "%sNoAuto: %s\n" | |
561 | "%sNoFail: %s\n", | |
562 | prefix, p->priority, | |
563 | prefix, yes_no(p->noauto), | |
564 | prefix, yes_no(p->nofail)); | |
565 | ||
e04aad61 LP |
566 | if (s->control_pid > 0) |
567 | fprintf(f, | |
568 | "%sControl PID: %lu\n", | |
569 | prefix, (unsigned long) s->control_pid); | |
570 | ||
571 | exec_context_dump(&s->exec_context, f, prefix); | |
4819ff03 | 572 | kill_context_dump(&s->kill_context, f, prefix); |
e04aad61 LP |
573 | } |
574 | ||
575 | static int swap_spawn(Swap *s, ExecCommand *c, pid_t *_pid) { | |
576 | pid_t pid; | |
577 | int r; | |
578 | ||
579 | assert(s); | |
580 | assert(c); | |
581 | assert(_pid); | |
582 | ||
4ad49000 LP |
583 | unit_realize_cgroup(UNIT(s)); |
584 | ||
718db961 | 585 | r = swap_arm_timer(s); |
646134dc | 586 | if (r < 0) |
e04aad61 LP |
587 | goto fail; |
588 | ||
646134dc ZJS |
589 | r = exec_spawn(c, |
590 | NULL, | |
591 | &s->exec_context, | |
592 | NULL, 0, | |
593 | UNIT(s)->manager->environment, | |
594 | true, | |
595 | true, | |
596 | true, | |
597 | UNIT(s)->manager->confirm_spawn, | |
13b84ec7 | 598 | UNIT(s)->manager->cgroup_supported, |
4ad49000 | 599 | UNIT(s)->cgroup_path, |
646134dc ZJS |
600 | UNIT(s)->id, |
601 | NULL, | |
602 | &pid); | |
603 | if (r < 0) | |
e04aad61 LP |
604 | goto fail; |
605 | ||
646134dc ZJS |
606 | r = unit_watch_pid(UNIT(s), pid); |
607 | if (r < 0) | |
e04aad61 LP |
608 | /* FIXME: we need to do something here */ |
609 | goto fail; | |
610 | ||
611 | *_pid = pid; | |
612 | ||
613 | return 0; | |
614 | ||
615 | fail: | |
718db961 | 616 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
e04aad61 LP |
617 | |
618 | return r; | |
07b0b134 ML |
619 | } |
620 | ||
e1770af8 | 621 | static void swap_enter_dead(Swap *s, SwapResult f) { |
07b0b134 ML |
622 | assert(s); |
623 | ||
e1770af8 LP |
624 | if (f != SWAP_SUCCESS) |
625 | s->result = f; | |
e04aad61 | 626 | |
c17ec25e | 627 | exec_context_tmp_dirs_done(&s->exec_context); |
e1770af8 | 628 | swap_set_state(s, s->result != SWAP_SUCCESS ? SWAP_FAILED : SWAP_DEAD); |
07b0b134 ML |
629 | } |
630 | ||
e1770af8 | 631 | static void swap_enter_active(Swap *s, SwapResult f) { |
e04aad61 LP |
632 | assert(s); |
633 | ||
e1770af8 LP |
634 | if (f != SWAP_SUCCESS) |
635 | s->result = f; | |
e04aad61 LP |
636 | |
637 | swap_set_state(s, SWAP_ACTIVE); | |
638 | } | |
639 | ||
e1770af8 | 640 | static void swap_enter_signal(Swap *s, SwapState state, SwapResult f) { |
07b0b134 ML |
641 | int r; |
642 | ||
643 | assert(s); | |
e04aad61 | 644 | |
e1770af8 LP |
645 | if (f != SWAP_SUCCESS) |
646 | s->result = f; | |
e04aad61 | 647 | |
cd2086fe LP |
648 | r = unit_kill_context( |
649 | UNIT(s), | |
650 | &s->kill_context, | |
651 | state != SWAP_ACTIVATING_SIGTERM && state != SWAP_DEACTIVATING_SIGTERM, | |
652 | -1, | |
653 | s->control_pid, | |
654 | false); | |
655 | if (r < 0) | |
656 | goto fail; | |
e04aad61 | 657 | |
cd2086fe | 658 | if (r > 0) { |
718db961 | 659 | r = swap_arm_timer(s); |
646134dc | 660 | if (r < 0) |
e04aad61 LP |
661 | goto fail; |
662 | ||
663 | swap_set_state(s, state); | |
664 | } else | |
e1770af8 | 665 | swap_enter_dead(s, SWAP_SUCCESS); |
e04aad61 LP |
666 | |
667 | return; | |
668 | ||
669 | fail: | |
66870f90 ZJS |
670 | log_warning_unit(UNIT(s)->id, |
671 | "%s failed to kill processes: %s", UNIT(s)->id, strerror(-r)); | |
e04aad61 | 672 | |
e1770af8 | 673 | swap_enter_dead(s, SWAP_FAILURE_RESOURCES); |
e04aad61 LP |
674 | } |
675 | ||
676 | static void swap_enter_activating(Swap *s) { | |
677 | int r, priority; | |
678 | ||
679 | assert(s); | |
680 | ||
681 | s->control_command_id = SWAP_EXEC_ACTIVATE; | |
682 | s->control_command = s->exec_command + SWAP_EXEC_ACTIVATE; | |
07b0b134 | 683 | |
4e85aff4 LP |
684 | if (s->from_fragment) |
685 | priority = s->parameters_fragment.priority; | |
e04aad61 LP |
686 | else |
687 | priority = -1; | |
4e85aff4 | 688 | |
e04aad61 | 689 | if (priority >= 0) { |
5bcb0f2b | 690 | char p[DECIMAL_STR_MAX(int)]; |
07b0b134 | 691 | |
5bcb0f2b | 692 | sprintf(p, "%i", priority); |
07b0b134 | 693 | |
e04aad61 LP |
694 | r = exec_command_set( |
695 | s->control_command, | |
696 | "/sbin/swapon", | |
697 | "-p", | |
698 | p, | |
699 | s->what, | |
700 | NULL); | |
701 | } else | |
702 | r = exec_command_set( | |
703 | s->control_command, | |
704 | "/sbin/swapon", | |
705 | s->what, | |
706 | NULL); | |
707 | ||
708 | if (r < 0) | |
709 | goto fail; | |
710 | ||
711 | swap_unwatch_control_pid(s); | |
712 | ||
646134dc ZJS |
713 | r = swap_spawn(s, s->control_command, &s->control_pid); |
714 | if (r < 0) | |
e04aad61 LP |
715 | goto fail; |
716 | ||
717 | swap_set_state(s, SWAP_ACTIVATING); | |
718 | ||
719 | return; | |
720 | ||
721 | fail: | |
66870f90 ZJS |
722 | log_warning_unit(UNIT(s)->id, |
723 | "%s failed to run 'swapon' task: %s", | |
724 | UNIT(s)->id, strerror(-r)); | |
e1770af8 | 725 | swap_enter_dead(s, SWAP_FAILURE_RESOURCES); |
e04aad61 LP |
726 | } |
727 | ||
e1770af8 | 728 | static void swap_enter_deactivating(Swap *s) { |
e04aad61 LP |
729 | int r; |
730 | ||
731 | assert(s); | |
732 | ||
e04aad61 LP |
733 | s->control_command_id = SWAP_EXEC_DEACTIVATE; |
734 | s->control_command = s->exec_command + SWAP_EXEC_DEACTIVATE; | |
735 | ||
646134dc | 736 | r = exec_command_set(s->control_command, |
e04aad61 LP |
737 | "/sbin/swapoff", |
738 | s->what, | |
646134dc ZJS |
739 | NULL); |
740 | if (r < 0) | |
e04aad61 LP |
741 | goto fail; |
742 | ||
743 | swap_unwatch_control_pid(s); | |
744 | ||
646134dc ZJS |
745 | r = swap_spawn(s, s->control_command, &s->control_pid); |
746 | if (r < 0) | |
e04aad61 LP |
747 | goto fail; |
748 | ||
749 | swap_set_state(s, SWAP_DEACTIVATING); | |
750 | ||
751 | return; | |
752 | ||
753 | fail: | |
66870f90 ZJS |
754 | log_warning_unit(UNIT(s)->id, |
755 | "%s failed to run 'swapoff' task: %s", | |
756 | UNIT(s)->id, strerror(-r)); | |
e1770af8 | 757 | swap_enter_active(s, SWAP_FAILURE_RESOURCES); |
e04aad61 LP |
758 | } |
759 | ||
760 | static int swap_start(Unit *u) { | |
761 | Swap *s = SWAP(u); | |
762 | ||
763 | assert(s); | |
764 | ||
765 | /* We cannot fulfill this request right now, try again later | |
766 | * please! */ | |
767 | ||
768 | if (s->state == SWAP_DEACTIVATING || | |
769 | s->state == SWAP_DEACTIVATING_SIGTERM || | |
770 | s->state == SWAP_DEACTIVATING_SIGKILL || | |
771 | s->state == SWAP_ACTIVATING_SIGTERM || | |
772 | s->state == SWAP_ACTIVATING_SIGKILL) | |
773 | return -EAGAIN; | |
774 | ||
775 | if (s->state == SWAP_ACTIVATING) | |
776 | return 0; | |
777 | ||
778 | assert(s->state == SWAP_DEAD || s->state == SWAP_FAILED); | |
779 | ||
a5c3034f LP |
780 | if (detect_container(NULL) > 0) |
781 | return -EPERM; | |
782 | ||
e1770af8 | 783 | s->result = SWAP_SUCCESS; |
e04aad61 | 784 | swap_enter_activating(s); |
07b0b134 ML |
785 | return 0; |
786 | } | |
787 | ||
788 | static int swap_stop(Unit *u) { | |
789 | Swap *s = SWAP(u); | |
07b0b134 ML |
790 | |
791 | assert(s); | |
792 | ||
e04aad61 LP |
793 | if (s->state == SWAP_DEACTIVATING || |
794 | s->state == SWAP_DEACTIVATING_SIGTERM || | |
795 | s->state == SWAP_DEACTIVATING_SIGKILL || | |
796 | s->state == SWAP_ACTIVATING_SIGTERM || | |
797 | s->state == SWAP_ACTIVATING_SIGKILL) | |
798 | return 0; | |
07b0b134 | 799 | |
e04aad61 | 800 | assert(s->state == SWAP_ACTIVATING || |
5bcb0f2b | 801 | s->state == SWAP_ACTIVATING_DONE || |
e04aad61 | 802 | s->state == SWAP_ACTIVE); |
07b0b134 | 803 | |
a5c3034f LP |
804 | if (detect_container(NULL) > 0) |
805 | return -EPERM; | |
806 | ||
e1770af8 | 807 | swap_enter_deactivating(s); |
07b0b134 ML |
808 | return 0; |
809 | } | |
810 | ||
811 | static int swap_serialize(Unit *u, FILE *f, FDSet *fds) { | |
812 | Swap *s = SWAP(u); | |
813 | ||
814 | assert(s); | |
815 | assert(f); | |
816 | assert(fds); | |
817 | ||
818 | unit_serialize_item(u, f, "state", swap_state_to_string(s->state)); | |
e1770af8 | 819 | unit_serialize_item(u, f, "result", swap_result_to_string(s->result)); |
e04aad61 LP |
820 | |
821 | if (s->control_pid > 0) | |
822 | unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) s->control_pid); | |
823 | ||
824 | if (s->control_command_id >= 0) | |
825 | unit_serialize_item(u, f, "control-command", swap_exec_command_to_string(s->control_command_id)); | |
07b0b134 | 826 | |
c17ec25e MS |
827 | exec_context_serialize(&s->exec_context, UNIT(s), f); |
828 | ||
07b0b134 ML |
829 | return 0; |
830 | } | |
831 | ||
832 | static int swap_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
833 | Swap *s = SWAP(u); | |
834 | ||
835 | assert(s); | |
836 | assert(fds); | |
837 | ||
838 | if (streq(key, "state")) { | |
839 | SwapState state; | |
840 | ||
646134dc ZJS |
841 | state = swap_state_from_string(value); |
842 | if (state < 0) | |
66870f90 | 843 | log_debug_unit(u->id, "Failed to parse state value %s", value); |
07b0b134 ML |
844 | else |
845 | s->deserialized_state = state; | |
e1770af8 LP |
846 | } else if (streq(key, "result")) { |
847 | SwapResult f; | |
848 | ||
849 | f = swap_result_from_string(value); | |
850 | if (f < 0) | |
66870f90 | 851 | log_debug_unit(u->id, "Failed to parse result value %s", value); |
e1770af8 LP |
852 | else if (f != SWAP_SUCCESS) |
853 | s->result = f; | |
e04aad61 LP |
854 | } else if (streq(key, "control-pid")) { |
855 | pid_t pid; | |
856 | ||
857 | if (parse_pid(value, &pid) < 0) | |
66870f90 | 858 | log_debug_unit(u->id, "Failed to parse control-pid value %s", value); |
e04aad61 LP |
859 | else |
860 | s->control_pid = pid; | |
861 | ||
862 | } else if (streq(key, "control-command")) { | |
863 | SwapExecCommand id; | |
864 | ||
646134dc ZJS |
865 | id = swap_exec_command_from_string(value); |
866 | if (id < 0) | |
66870f90 | 867 | log_debug_unit(u->id, "Failed to parse exec-command value %s", value); |
e04aad61 LP |
868 | else { |
869 | s->control_command_id = id; | |
870 | s->control_command = s->exec_command + id; | |
871 | } | |
c17ec25e MS |
872 | } else if (streq(key, "tmp-dir")) { |
873 | char *t; | |
874 | ||
875 | t = strdup(value); | |
876 | if (!t) | |
877 | return log_oom(); | |
878 | ||
879 | s->exec_context.tmp_dir = t; | |
880 | } else if (streq(key, "var-tmp-dir")) { | |
881 | char *t; | |
882 | ||
883 | t = strdup(value); | |
884 | if (!t) | |
885 | return log_oom(); | |
e04aad61 | 886 | |
c17ec25e | 887 | s->exec_context.var_tmp_dir = t; |
07b0b134 | 888 | } else |
66870f90 | 889 | log_debug_unit(u->id, "Unknown serialization key '%s'", key); |
07b0b134 ML |
890 | |
891 | return 0; | |
892 | } | |
893 | ||
44a6b1b6 | 894 | _pure_ static UnitActiveState swap_active_state(Unit *u) { |
07b0b134 ML |
895 | assert(u); |
896 | ||
897 | return state_translation_table[SWAP(u)->state]; | |
898 | } | |
899 | ||
44a6b1b6 | 900 | _pure_ static const char *swap_sub_state_to_string(Unit *u) { |
07b0b134 ML |
901 | assert(u); |
902 | ||
903 | return swap_state_to_string(SWAP(u)->state); | |
904 | } | |
905 | ||
44a6b1b6 | 906 | _pure_ static bool swap_check_gc(Unit *u) { |
07b0b134 ML |
907 | Swap *s = SWAP(u); |
908 | ||
909 | assert(s); | |
910 | ||
6b1dc2bd | 911 | return s->from_proc_swaps; |
07b0b134 ML |
912 | } |
913 | ||
e04aad61 LP |
914 | static void swap_sigchld_event(Unit *u, pid_t pid, int code, int status) { |
915 | Swap *s = SWAP(u); | |
e1770af8 | 916 | SwapResult f; |
e04aad61 LP |
917 | |
918 | assert(s); | |
919 | assert(pid >= 0); | |
920 | ||
921 | if (pid != s->control_pid) | |
922 | return; | |
923 | ||
924 | s->control_pid = 0; | |
925 | ||
96342de6 | 926 | if (is_clean_exit(code, status, NULL)) |
e1770af8 LP |
927 | f = SWAP_SUCCESS; |
928 | else if (code == CLD_EXITED) | |
929 | f = SWAP_FAILURE_EXIT_CODE; | |
930 | else if (code == CLD_KILLED) | |
931 | f = SWAP_FAILURE_SIGNAL; | |
932 | else if (code == CLD_DUMPED) | |
933 | f = SWAP_FAILURE_CORE_DUMP; | |
934 | else | |
935 | assert_not_reached("Unknown code"); | |
936 | ||
937 | if (f != SWAP_SUCCESS) | |
938 | s->result = f; | |
e04aad61 LP |
939 | |
940 | if (s->control_command) { | |
6ea832a2 | 941 | exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status); |
e1770af8 | 942 | |
e04aad61 LP |
943 | s->control_command = NULL; |
944 | s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; | |
945 | } | |
946 | ||
66870f90 ZJS |
947 | log_full_unit(f == SWAP_SUCCESS ? LOG_DEBUG : LOG_NOTICE, |
948 | u->id, | |
949 | "%s swap process exited, code=%s status=%i", | |
950 | u->id, sigchld_code_to_string(code), status); | |
e04aad61 LP |
951 | |
952 | switch (s->state) { | |
953 | ||
954 | case SWAP_ACTIVATING: | |
5bcb0f2b | 955 | case SWAP_ACTIVATING_DONE: |
e04aad61 LP |
956 | case SWAP_ACTIVATING_SIGTERM: |
957 | case SWAP_ACTIVATING_SIGKILL: | |
958 | ||
e1770af8 LP |
959 | if (f == SWAP_SUCCESS) |
960 | swap_enter_active(s, f); | |
e04aad61 | 961 | else |
e1770af8 | 962 | swap_enter_dead(s, f); |
e04aad61 LP |
963 | break; |
964 | ||
965 | case SWAP_DEACTIVATING: | |
966 | case SWAP_DEACTIVATING_SIGKILL: | |
967 | case SWAP_DEACTIVATING_SIGTERM: | |
968 | ||
e1770af8 LP |
969 | if (f == SWAP_SUCCESS) |
970 | swap_enter_dead(s, f); | |
e04aad61 | 971 | else |
e1770af8 | 972 | swap_enter_dead(s, f); |
e04aad61 LP |
973 | break; |
974 | ||
975 | default: | |
976 | assert_not_reached("Uh, control process died at wrong time."); | |
977 | } | |
978 | ||
979 | /* Notify clients about changed exit status */ | |
980 | unit_add_to_dbus_queue(u); | |
e04aad61 LP |
981 | } |
982 | ||
718db961 LP |
983 | static int swap_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) { |
984 | Swap *s = SWAP(userdata); | |
e04aad61 LP |
985 | |
986 | assert(s); | |
718db961 | 987 | assert(s->timer_event_source == source); |
e04aad61 LP |
988 | |
989 | switch (s->state) { | |
990 | ||
991 | case SWAP_ACTIVATING: | |
5bcb0f2b | 992 | case SWAP_ACTIVATING_DONE: |
718db961 | 993 | log_warning_unit(UNIT(s)->id, "%s activation timed out. Stopping.", UNIT(s)->id); |
e1770af8 | 994 | swap_enter_signal(s, SWAP_ACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT); |
e04aad61 LP |
995 | break; |
996 | ||
997 | case SWAP_DEACTIVATING: | |
718db961 | 998 | log_warning_unit(UNIT(s)->id, "%s deactivation timed out. Stopping.", UNIT(s)->id); |
e1770af8 | 999 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT); |
e04aad61 LP |
1000 | break; |
1001 | ||
1002 | case SWAP_ACTIVATING_SIGTERM: | |
4819ff03 | 1003 | if (s->kill_context.send_sigkill) { |
718db961 | 1004 | log_warning_unit(UNIT(s)->id, "%s activation timed out. Killing.", UNIT(s)->id); |
e1770af8 | 1005 | swap_enter_signal(s, SWAP_ACTIVATING_SIGKILL, SWAP_FAILURE_TIMEOUT); |
ba035df2 | 1006 | } else { |
718db961 | 1007 | log_warning_unit(UNIT(s)->id, "%s activation timed out. Skipping SIGKILL. Ignoring.", UNIT(s)->id); |
e1770af8 | 1008 | swap_enter_dead(s, SWAP_FAILURE_TIMEOUT); |
ba035df2 | 1009 | } |
e04aad61 LP |
1010 | break; |
1011 | ||
1012 | case SWAP_DEACTIVATING_SIGTERM: | |
4819ff03 | 1013 | if (s->kill_context.send_sigkill) { |
718db961 | 1014 | log_warning_unit(UNIT(s)->id, "%s deactivation timed out. Killing.", UNIT(s)->id); |
e1770af8 | 1015 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, SWAP_FAILURE_TIMEOUT); |
ba035df2 | 1016 | } else { |
718db961 | 1017 | log_warning_unit(UNIT(s)->id, "%s deactivation timed out. Skipping SIGKILL. Ignoring.", UNIT(s)->id); |
e1770af8 | 1018 | swap_enter_dead(s, SWAP_FAILURE_TIMEOUT); |
ba035df2 | 1019 | } |
e04aad61 LP |
1020 | break; |
1021 | ||
1022 | case SWAP_ACTIVATING_SIGKILL: | |
1023 | case SWAP_DEACTIVATING_SIGKILL: | |
718db961 | 1024 | log_warning_unit(UNIT(s)->id, "%s swap process still around after SIGKILL. Ignoring.", UNIT(s)->id); |
e1770af8 | 1025 | swap_enter_dead(s, SWAP_FAILURE_TIMEOUT); |
e04aad61 LP |
1026 | break; |
1027 | ||
1028 | default: | |
1029 | assert_not_reached("Timeout at wrong time."); | |
1030 | } | |
718db961 LP |
1031 | |
1032 | return 0; | |
e04aad61 LP |
1033 | } |
1034 | ||
1035 | static int swap_load_proc_swaps(Manager *m, bool set_flags) { | |
1036 | unsigned i; | |
1037 | int r = 0; | |
1038 | ||
1039 | assert(m); | |
1040 | ||
07b0b134 | 1041 | rewind(m->proc_swaps); |
bab45044 | 1042 | |
4e85aff4 | 1043 | (void) fscanf(m->proc_swaps, "%*s %*s %*s %*s %*s\n"); |
07b0b134 | 1044 | |
e04aad61 | 1045 | for (i = 1;; i++) { |
9fb3675e | 1046 | _cleanup_free_ char *dev = NULL, *d = NULL; |
07b0b134 ML |
1047 | int prio = 0, k; |
1048 | ||
646134dc ZJS |
1049 | k = fscanf(m->proc_swaps, |
1050 | "%ms " /* device/file */ | |
1051 | "%*s " /* type of swap */ | |
1052 | "%*s " /* swap size */ | |
1053 | "%*s " /* used */ | |
1054 | "%i\n", /* priority */ | |
1055 | &dev, &prio); | |
1056 | if (k != 2) { | |
07b0b134 | 1057 | if (k == EOF) |
4e85aff4 | 1058 | break; |
07b0b134 | 1059 | |
646134dc | 1060 | log_warning("Failed to parse /proc/swaps:%u", i); |
e04aad61 | 1061 | continue; |
07b0b134 | 1062 | } |
07b0b134 | 1063 | |
4e85aff4 | 1064 | d = cunescape(dev); |
4e85aff4 LP |
1065 | if (!d) |
1066 | return -ENOMEM; | |
1067 | ||
e04aad61 | 1068 | k = swap_process_new_swap(m, d, prio, set_flags); |
07b0b134 | 1069 | if (k < 0) |
e04aad61 | 1070 | r = k; |
07b0b134 ML |
1071 | } |
1072 | ||
e04aad61 LP |
1073 | return r; |
1074 | } | |
1075 | ||
718db961 LP |
1076 | static int swap_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) { |
1077 | Manager *m = userdata; | |
595ed347 | 1078 | Unit *u; |
4e434314 LP |
1079 | int r; |
1080 | ||
1081 | assert(m); | |
718db961 | 1082 | assert(revents & EPOLLPRI); |
4e434314 | 1083 | |
646134dc ZJS |
1084 | r = swap_load_proc_swaps(m, true); |
1085 | if (r < 0) { | |
e04aad61 LP |
1086 | log_error("Failed to reread /proc/swaps: %s", strerror(-r)); |
1087 | ||
1088 | /* Reset flags, just in case, for late calls */ | |
595ed347 MS |
1089 | LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) { |
1090 | Swap *swap = SWAP(u); | |
e04aad61 LP |
1091 | |
1092 | swap->is_active = swap->just_activated = false; | |
1093 | } | |
1094 | ||
1095 | return 0; | |
1096 | } | |
1097 | ||
1098 | manager_dispatch_load_queue(m); | |
1099 | ||
595ed347 MS |
1100 | LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) { |
1101 | Swap *swap = SWAP(u); | |
e04aad61 LP |
1102 | |
1103 | if (!swap->is_active) { | |
1104 | /* This has just been deactivated */ | |
1105 | ||
e04aad61 LP |
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: | |
5bcb0f2b | 1115 | /* Fire again */ |
e04aad61 LP |
1116 | swap_set_state(swap, swap->state); |
1117 | break; | |
1118 | } | |
1119 | ||
1120 | } else if (swap->just_activated) { | |
1121 | ||
1122 | /* New swap entry */ | |
1123 | ||
1124 | switch (swap->state) { | |
1125 | ||
1126 | case SWAP_DEAD: | |
1127 | case SWAP_FAILED: | |
e1770af8 | 1128 | swap_enter_active(swap, SWAP_SUCCESS); |
e04aad61 LP |
1129 | break; |
1130 | ||
5bcb0f2b LP |
1131 | case SWAP_ACTIVATING: |
1132 | swap_set_state(swap, SWAP_ACTIVATING_DONE); | |
1133 | break; | |
1134 | ||
e04aad61 LP |
1135 | default: |
1136 | /* Nothing really changed, but let's | |
1137 | * issue an notification call | |
1138 | * nonetheless, in case somebody is | |
1139 | * waiting for this. */ | |
1140 | swap_set_state(swap, swap->state); | |
1141 | break; | |
1142 | } | |
1143 | } | |
1144 | ||
1145 | /* Reset the flags for later calls */ | |
1146 | swap->is_active = swap->just_activated = false; | |
1147 | } | |
1148 | ||
1149 | return 1; | |
1150 | } | |
1151 | ||
1152 | static Unit *swap_following(Unit *u) { | |
1153 | Swap *s = SWAP(u); | |
1154 | Swap *other, *first = NULL; | |
1155 | ||
1156 | assert(s); | |
1157 | ||
1158 | if (streq_ptr(s->what, s->parameters_proc_swaps.what)) | |
1159 | return NULL; | |
1160 | ||
1161 | /* Make everybody follow the unit that's named after the swap | |
1162 | * device in the kernel */ | |
1163 | ||
1164 | LIST_FOREACH_AFTER(same_proc_swaps, other, s) | |
1165 | if (streq_ptr(other->what, other->parameters_proc_swaps.what)) | |
1166 | return UNIT(other); | |
1167 | ||
1168 | LIST_FOREACH_BEFORE(same_proc_swaps, other, s) { | |
1169 | if (streq_ptr(other->what, other->parameters_proc_swaps.what)) | |
1170 | return UNIT(other); | |
1171 | ||
1172 | first = other; | |
1173 | } | |
1174 | ||
1175 | return UNIT(first); | |
07b0b134 ML |
1176 | } |
1177 | ||
6210e7fc | 1178 | static int swap_following_set(Unit *u, Set **_set) { |
5bcb0f2b | 1179 | Swap *s = SWAP(u), *other; |
6210e7fc LP |
1180 | Set *set; |
1181 | int r; | |
1182 | ||
1183 | assert(s); | |
1184 | assert(_set); | |
1185 | ||
1186 | if (LIST_JUST_US(same_proc_swaps, s)) { | |
1187 | *_set = NULL; | |
1188 | return 0; | |
1189 | } | |
1190 | ||
5bcb0f2b LP |
1191 | set = set_new(NULL, NULL); |
1192 | if (!set) | |
6210e7fc LP |
1193 | return -ENOMEM; |
1194 | ||
5bcb0f2b LP |
1195 | LIST_FOREACH_AFTER(same_proc_swaps, other, s) { |
1196 | r = set_put(set, other); | |
1197 | if (r < 0) | |
6210e7fc | 1198 | goto fail; |
5bcb0f2b | 1199 | } |
6210e7fc | 1200 | |
5bcb0f2b LP |
1201 | LIST_FOREACH_BEFORE(same_proc_swaps, other, s) { |
1202 | r = set_put(set, other); | |
1203 | if (r < 0) | |
6210e7fc | 1204 | goto fail; |
5bcb0f2b | 1205 | } |
6210e7fc LP |
1206 | |
1207 | *_set = set; | |
1208 | return 1; | |
1209 | ||
1210 | fail: | |
1211 | set_free(set); | |
1212 | return r; | |
1213 | } | |
1214 | ||
07b0b134 ML |
1215 | static void swap_shutdown(Manager *m) { |
1216 | assert(m); | |
1217 | ||
718db961 LP |
1218 | m->swap_event_source = sd_event_source_unref(m->swap_event_source); |
1219 | ||
07b0b134 ML |
1220 | if (m->proc_swaps) { |
1221 | fclose(m->proc_swaps); | |
1222 | m->proc_swaps = NULL; | |
1223 | } | |
e04aad61 LP |
1224 | |
1225 | hashmap_free(m->swaps_by_proc_swaps); | |
1226 | m->swaps_by_proc_swaps = NULL; | |
07b0b134 ML |
1227 | } |
1228 | ||
07b0b134 ML |
1229 | static int swap_enumerate(Manager *m) { |
1230 | int r; | |
1231 | assert(m); | |
1232 | ||
4e434314 | 1233 | if (!m->proc_swaps) { |
646134dc ZJS |
1234 | m->proc_swaps = fopen("/proc/swaps", "re"); |
1235 | if (!m->proc_swaps) | |
718db961 | 1236 | return errno == ENOENT ? 0 : -errno; |
4e434314 | 1237 | |
718db961 LP |
1238 | r = sd_event_add_io(m->event, fileno(m->proc_swaps), EPOLLPRI, swap_dispatch_io, m, &m->swap_event_source); |
1239 | if (r < 0) | |
1240 | goto fail; | |
4e434314 LP |
1241 | } |
1242 | ||
646134dc ZJS |
1243 | r = swap_load_proc_swaps(m, false); |
1244 | if (r < 0) | |
718db961 LP |
1245 | goto fail; |
1246 | ||
1247 | return 0; | |
07b0b134 | 1248 | |
718db961 LP |
1249 | fail: |
1250 | swap_shutdown(m); | |
07b0b134 ML |
1251 | return r; |
1252 | } | |
1253 | ||
fdf20a31 | 1254 | static void swap_reset_failed(Unit *u) { |
5632e374 LP |
1255 | Swap *s = SWAP(u); |
1256 | ||
1257 | assert(s); | |
1258 | ||
fdf20a31 | 1259 | if (s->state == SWAP_FAILED) |
5632e374 | 1260 | swap_set_state(s, SWAP_DEAD); |
e04aad61 | 1261 | |
e1770af8 | 1262 | s->result = SWAP_SUCCESS; |
5632e374 LP |
1263 | } |
1264 | ||
718db961 | 1265 | static int swap_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) { |
814cc562 | 1266 | return unit_kill_common(u, who, signo, -1, SWAP(u)->control_pid, error); |
8a0867d6 LP |
1267 | } |
1268 | ||
5632e374 LP |
1269 | static const char* const swap_state_table[_SWAP_STATE_MAX] = { |
1270 | [SWAP_DEAD] = "dead", | |
e04aad61 | 1271 | [SWAP_ACTIVATING] = "activating", |
5bcb0f2b | 1272 | [SWAP_ACTIVATING_DONE] = "activating-done", |
5632e374 | 1273 | [SWAP_ACTIVE] = "active", |
e04aad61 LP |
1274 | [SWAP_DEACTIVATING] = "deactivating", |
1275 | [SWAP_ACTIVATING_SIGTERM] = "activating-sigterm", | |
1276 | [SWAP_ACTIVATING_SIGKILL] = "activating-sigkill", | |
1277 | [SWAP_DEACTIVATING_SIGTERM] = "deactivating-sigterm", | |
1278 | [SWAP_DEACTIVATING_SIGKILL] = "deactivating-sigkill", | |
fdf20a31 | 1279 | [SWAP_FAILED] = "failed" |
5632e374 LP |
1280 | }; |
1281 | ||
1282 | DEFINE_STRING_TABLE_LOOKUP(swap_state, SwapState); | |
1283 | ||
e04aad61 LP |
1284 | static const char* const swap_exec_command_table[_SWAP_EXEC_COMMAND_MAX] = { |
1285 | [SWAP_EXEC_ACTIVATE] = "ExecActivate", | |
1286 | [SWAP_EXEC_DEACTIVATE] = "ExecDeactivate", | |
1287 | }; | |
1288 | ||
1289 | DEFINE_STRING_TABLE_LOOKUP(swap_exec_command, SwapExecCommand); | |
1290 | ||
e1770af8 LP |
1291 | static const char* const swap_result_table[_SWAP_RESULT_MAX] = { |
1292 | [SWAP_SUCCESS] = "success", | |
1293 | [SWAP_FAILURE_RESOURCES] = "resources", | |
1294 | [SWAP_FAILURE_TIMEOUT] = "timeout", | |
1295 | [SWAP_FAILURE_EXIT_CODE] = "exit-code", | |
1296 | [SWAP_FAILURE_SIGNAL] = "signal", | |
1297 | [SWAP_FAILURE_CORE_DUMP] = "core-dump" | |
1298 | }; | |
1299 | ||
1300 | DEFINE_STRING_TABLE_LOOKUP(swap_result, SwapResult); | |
1301 | ||
07b0b134 | 1302 | const UnitVTable swap_vtable = { |
7d17cfbc | 1303 | .object_size = sizeof(Swap), |
718db961 LP |
1304 | .exec_context_offset = offsetof(Swap, exec_context), |
1305 | .cgroup_context_offset = offsetof(Swap, cgroup_context), | |
1306 | .kill_context_offset = offsetof(Swap, kill_context), | |
3ef63c31 | 1307 | |
f975e971 LP |
1308 | .sections = |
1309 | "Unit\0" | |
1310 | "Swap\0" | |
1311 | "Install\0", | |
4ad49000 | 1312 | .private_section = "Swap", |
71645aca | 1313 | |
e04aad61 | 1314 | .no_alias = true, |
07b0b134 ML |
1315 | .no_instances = true, |
1316 | ||
4e85aff4 | 1317 | .init = swap_init, |
07b0b134 | 1318 | .load = swap_load, |
6e620bec | 1319 | .done = swap_done, |
07b0b134 ML |
1320 | |
1321 | .coldplug = swap_coldplug, | |
1322 | ||
1323 | .dump = swap_dump, | |
1324 | ||
1325 | .start = swap_start, | |
1326 | .stop = swap_stop, | |
1327 | ||
8a0867d6 LP |
1328 | .kill = swap_kill, |
1329 | ||
07b0b134 ML |
1330 | .serialize = swap_serialize, |
1331 | .deserialize_item = swap_deserialize_item, | |
1332 | ||
1333 | .active_state = swap_active_state, | |
1334 | .sub_state_to_string = swap_sub_state_to_string, | |
1335 | ||
1336 | .check_gc = swap_check_gc, | |
1337 | ||
e04aad61 | 1338 | .sigchld_event = swap_sigchld_event, |
e04aad61 LP |
1339 | |
1340 | .reset_failed = swap_reset_failed, | |
1341 | ||
c4e2ceae | 1342 | .bus_interface = "org.freedesktop.systemd1.Swap", |
718db961 LP |
1343 | .bus_vtable = bus_swap_vtable, |
1344 | .bus_changing_properties = bus_swap_changing_properties, | |
74c964d3 LP |
1345 | .bus_set_property = bus_swap_set_property, |
1346 | .bus_commit_properties = bus_swap_commit_properties, | |
07b0b134 | 1347 | |
e04aad61 | 1348 | .following = swap_following, |
6210e7fc | 1349 | .following_set = swap_following_set, |
5632e374 | 1350 | |
6e620bec | 1351 | .enumerate = swap_enumerate, |
c6918296 MS |
1352 | .shutdown = swap_shutdown, |
1353 | ||
1354 | .status_message_formats = { | |
1355 | .starting_stopping = { | |
1356 | [0] = "Activating swap %s...", | |
1357 | [1] = "Deactivating swap %s...", | |
1358 | }, | |
1359 | .finished_start_job = { | |
1360 | [JOB_DONE] = "Activated swap %s.", | |
1361 | [JOB_FAILED] = "Failed to activate swap %s.", | |
1362 | [JOB_DEPENDENCY] = "Dependency failed for %s.", | |
1363 | [JOB_TIMEOUT] = "Timed out activating swap %s.", | |
1364 | }, | |
1365 | .finished_stop_job = { | |
1366 | [JOB_DONE] = "Deactivated swap %s.", | |
1367 | [JOB_FAILED] = "Failed deactivating swap %s.", | |
1368 | [JOB_TIMEOUT] = "Timed out deactivating swap %s.", | |
1369 | }, | |
1370 | }, | |
07b0b134 | 1371 | }; |