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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" |
96aad8d1 | 38 | #include "bus-common-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) { |
9670d583 LP |
62 | assert(s); |
63 | ||
64 | if (!s->from_proc_swaps) | |
65 | return; | |
66 | ||
67 | free(s->parameters_proc_swaps.what); | |
68 | s->parameters_proc_swaps.what = NULL; | |
69 | ||
70 | s->from_proc_swaps = false; | |
71 | } | |
72 | ||
73 | static int swap_set_devnode(Swap *s, const char *devnode) { | |
df326b84 | 74 | Hashmap *swaps; |
5bcb0f2b | 75 | Swap *first; |
9670d583 | 76 | int r; |
e04aad61 LP |
77 | |
78 | assert(s); | |
79 | ||
d5099efc | 80 | r = hashmap_ensure_allocated(&UNIT(s)->manager->swaps_by_devnode, &string_hash_ops); |
9670d583 LP |
81 | if (r < 0) |
82 | return r; | |
e04aad61 | 83 | |
9670d583 | 84 | swaps = UNIT(s)->manager->swaps_by_devnode; |
e04aad61 | 85 | |
9670d583 LP |
86 | if (s->devnode) { |
87 | first = hashmap_get(swaps, s->devnode); | |
e04aad61 | 88 | |
9670d583 LP |
89 | LIST_REMOVE(same_devnode, first, s); |
90 | if (first) | |
91 | hashmap_replace(swaps, first->devnode, first); | |
92 | else | |
93 | hashmap_remove(swaps, s->devnode); | |
5bcb0f2b | 94 | |
9670d583 LP |
95 | free(s->devnode); |
96 | s->devnode = NULL; | |
97 | } | |
98 | ||
99 | if (devnode) { | |
100 | s->devnode = strdup(devnode); | |
101 | if (!s->devnode) | |
102 | return -ENOMEM; | |
103 | ||
104 | first = hashmap_get(swaps, s->devnode); | |
105 | LIST_PREPEND(same_devnode, first, s); | |
106 | ||
107 | return hashmap_replace(swaps, first->devnode, first); | |
108 | } | |
109 | ||
110 | return 0; | |
e04aad61 LP |
111 | } |
112 | ||
f6cebb3b | 113 | static void swap_init(Unit *u) { |
6e620bec LP |
114 | Swap *s = SWAP(u); |
115 | ||
116 | assert(s); | |
1124fe6f | 117 | assert(UNIT(s)->load_state == UNIT_STUB); |
6e620bec | 118 | |
1f19a534 | 119 | s->timeout_usec = u->manager->default_timeout_start_usec; |
e04aad61 | 120 | |
ac155bb8 MS |
121 | s->exec_context.std_output = u->manager->default_std_output; |
122 | s->exec_context.std_error = u->manager->default_std_error; | |
085afe36 | 123 | |
6b1dc2bd | 124 | s->parameters_proc_swaps.priority = s->parameters_fragment.priority = -1; |
e04aad61 | 125 | |
e1770af8 | 126 | s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; |
c8f4d764 | 127 | |
5bcb0f2b | 128 | u->ignore_on_isolate = true; |
e04aad61 LP |
129 | } |
130 | ||
131 | static void swap_unwatch_control_pid(Swap *s) { | |
132 | assert(s); | |
133 | ||
134 | if (s->control_pid <= 0) | |
135 | return; | |
136 | ||
137 | unit_unwatch_pid(UNIT(s), s->control_pid); | |
138 | s->control_pid = 0; | |
6e620bec LP |
139 | } |
140 | ||
4e85aff4 LP |
141 | static void swap_done(Unit *u) { |
142 | Swap *s = SWAP(u); | |
07b0b134 | 143 | |
4e85aff4 | 144 | assert(s); |
07b0b134 | 145 | |
e04aad61 | 146 | swap_unset_proc_swaps(s); |
9670d583 | 147 | swap_set_devnode(s, NULL); |
e04aad61 | 148 | |
4e85aff4 | 149 | free(s->what); |
e04aad61 LP |
150 | s->what = NULL; |
151 | ||
4e85aff4 | 152 | free(s->parameters_fragment.what); |
6b1dc2bd | 153 | s->parameters_fragment.what = NULL; |
e04aad61 | 154 | |
47cb901e LP |
155 | free(s->parameters_fragment.options); |
156 | s->parameters_fragment.options = NULL; | |
86b23b07 | 157 | |
613b411c | 158 | s->exec_runtime = exec_runtime_unref(s->exec_runtime); |
e04aad61 LP |
159 | exec_command_done_array(s->exec_command, _SWAP_EXEC_COMMAND_MAX); |
160 | s->control_command = NULL; | |
161 | ||
162 | swap_unwatch_control_pid(s); | |
163 | ||
718db961 LP |
164 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
165 | } | |
166 | ||
167 | static int swap_arm_timer(Swap *s) { | |
168 | int r; | |
169 | ||
170 | assert(s); | |
171 | ||
172 | if (s->timeout_usec <= 0) { | |
173 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); | |
174 | return 0; | |
175 | } | |
176 | ||
177 | if (s->timer_event_source) { | |
178 | r = sd_event_source_set_time(s->timer_event_source, now(CLOCK_MONOTONIC) + s->timeout_usec); | |
179 | if (r < 0) | |
180 | return r; | |
181 | ||
182 | return sd_event_source_set_enabled(s->timer_event_source, SD_EVENT_ONESHOT); | |
183 | } | |
184 | ||
6a0f1f6d LP |
185 | return sd_event_add_time( |
186 | UNIT(s)->manager->event, | |
187 | &s->timer_event_source, | |
188 | CLOCK_MONOTONIC, | |
189 | now(CLOCK_MONOTONIC) + s->timeout_usec, 0, | |
190 | swap_dispatch_timer, s); | |
07b0b134 ML |
191 | } |
192 | ||
173a8d04 | 193 | static int swap_add_device_links(Swap *s) { |
173a8d04 LP |
194 | assert(s); |
195 | ||
196 | if (!s->what) | |
197 | return 0; | |
198 | ||
f10af76d LP |
199 | if (!s->from_fragment) |
200 | return 0; | |
201 | ||
cfcfd4ae | 202 | if (is_device_path(s->what)) |
ddb7d6b9 | 203 | return unit_add_node_link(UNIT(s), s->what, UNIT(s)->manager->running_as == SYSTEMD_SYSTEM); |
cfcfd4ae LP |
204 | else |
205 | /* File based swap devices need to be ordered after | |
2b93b027 | 206 | * systemd-remount-fs.service, since they might need a |
cfcfd4ae | 207 | * writable file system. */ |
2b93b027 | 208 | return unit_add_dependency_by_name(UNIT(s), UNIT_AFTER, SPECIAL_REMOUNT_FS_SERVICE, NULL, true); |
173a8d04 LP |
209 | } |
210 | ||
2edd4434 | 211 | static int swap_add_default_dependencies(Swap *s) { |
2edd4434 LP |
212 | assert(s); |
213 | ||
67445f4e | 214 | if (UNIT(s)->manager->running_as != SYSTEMD_SYSTEM) |
6b1dc2bd | 215 | return 0; |
2edd4434 | 216 | |
c0387ebf LP |
217 | if (detect_container(NULL) > 0) |
218 | return 0; | |
219 | ||
5607d856 | 220 | return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true); |
2edd4434 LP |
221 | } |
222 | ||
4e85aff4 LP |
223 | static int swap_verify(Swap *s) { |
224 | bool b; | |
7fd1b19b | 225 | _cleanup_free_ char *e = NULL; |
4e85aff4 | 226 | |
1124fe6f | 227 | if (UNIT(s)->load_state != UNIT_LOADED) |
5bcb0f2b | 228 | return 0; |
4e85aff4 | 229 | |
170ca19e | 230 | e = unit_name_from_path(s->what, ".swap"); |
5bcb0f2b | 231 | if (!e) |
170ca19e | 232 | return log_oom(); |
4e85aff4 LP |
233 | |
234 | b = unit_has_name(UNIT(s), e); | |
4e85aff4 | 235 | if (!b) { |
79008bdd | 236 | log_unit_error(UNIT(s)->id, "%s: Value of \"What\" and unit name do not match, not loading.", UNIT(s)->id); |
4e85aff4 LP |
237 | return -EINVAL; |
238 | } | |
239 | ||
4819ff03 | 240 | if (s->exec_context.pam_name && s->kill_context.kill_mode != KILL_CONTROL_GROUP) { |
79008bdd | 241 | log_unit_error(UNIT(s)->id, "%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing to load.", UNIT(s)->id); |
e04aad61 LP |
242 | return -EINVAL; |
243 | } | |
244 | ||
4e85aff4 LP |
245 | return 0; |
246 | } | |
247 | ||
9670d583 LP |
248 | static int swap_load_devnode(Swap *s) { |
249 | _cleanup_udev_device_unref_ struct udev_device *d = NULL; | |
250 | struct stat st; | |
251 | const char *p; | |
252 | ||
253 | assert(s); | |
254 | ||
255 | if (stat(s->what, &st) < 0 || !S_ISBLK(st.st_mode)) | |
256 | return 0; | |
257 | ||
258 | d = udev_device_new_from_devnum(UNIT(s)->manager->udev, 'b', st.st_rdev); | |
259 | if (!d) | |
260 | return 0; | |
261 | ||
262 | p = udev_device_get_devnode(d); | |
263 | if (!p) | |
264 | return 0; | |
265 | ||
266 | return swap_set_devnode(s, p); | |
267 | } | |
268 | ||
07b0b134 ML |
269 | static int swap_load(Unit *u) { |
270 | int r; | |
271 | Swap *s = SWAP(u); | |
272 | ||
273 | assert(s); | |
ac155bb8 | 274 | assert(u->load_state == UNIT_STUB); |
07b0b134 ML |
275 | |
276 | /* Load a .swap file */ | |
646134dc ZJS |
277 | r = unit_load_fragment_and_dropin_optional(u); |
278 | if (r < 0) | |
07b0b134 ML |
279 | return r; |
280 | ||
ac155bb8 | 281 | if (u->load_state == UNIT_LOADED) { |
4e85aff4 | 282 | |
1124fe6f | 283 | if (UNIT(s)->fragment_path) |
4e85aff4 LP |
284 | s->from_fragment = true; |
285 | ||
286 | if (!s->what) { | |
287 | if (s->parameters_fragment.what) | |
288 | s->what = strdup(s->parameters_fragment.what); | |
4e85aff4 LP |
289 | else if (s->parameters_proc_swaps.what) |
290 | s->what = strdup(s->parameters_proc_swaps.what); | |
291 | else | |
ac155bb8 | 292 | s->what = unit_name_to_path(u->id); |
4e85aff4 LP |
293 | |
294 | if (!s->what) | |
07b0b134 | 295 | return -ENOMEM; |
4e85aff4 | 296 | } |
07b0b134 ML |
297 | |
298 | path_kill_slashes(s->what); | |
299 | ||
5bcb0f2b LP |
300 | if (!UNIT(s)->description) { |
301 | r = unit_set_description(u, s->what); | |
302 | if (r < 0) | |
4e85aff4 | 303 | return r; |
5bcb0f2b | 304 | } |
4e85aff4 | 305 | |
a57f7e2c | 306 | r = unit_require_mounts_for(UNIT(s), s->what); |
646134dc | 307 | if (r < 0) |
07b0b134 ML |
308 | return r; |
309 | ||
a57f7e2c | 310 | r = swap_add_device_links(s); |
646134dc | 311 | if (r < 0) |
6e2ef85b | 312 | return r; |
07b0b134 | 313 | |
9670d583 LP |
314 | r = swap_load_devnode(s); |
315 | if (r < 0) | |
316 | return r; | |
317 | ||
598459ce LP |
318 | r = unit_patch_contexts(u); |
319 | if (r < 0) | |
320 | return r; | |
321 | ||
322 | r = unit_add_exec_dependencies(u, &s->exec_context); | |
323 | if (r < 0) | |
324 | return r; | |
325 | ||
326 | r = unit_add_default_slice(u, &s->cgroup_context); | |
a016b922 LP |
327 | if (r < 0) |
328 | return r; | |
329 | ||
646134dc ZJS |
330 | if (UNIT(s)->default_dependencies) { |
331 | r = swap_add_default_dependencies(s); | |
332 | if (r < 0) | |
2edd4434 | 333 | return r; |
646134dc | 334 | } |
07b0b134 ML |
335 | } |
336 | ||
337 | return swap_verify(s); | |
338 | } | |
339 | ||
6b1dc2bd | 340 | static int swap_add_one( |
4e85aff4 LP |
341 | Manager *m, |
342 | const char *what, | |
e04aad61 | 343 | const char *what_proc_swaps, |
4e85aff4 | 344 | int priority, |
e04aad61 LP |
345 | bool set_flags) { |
346 | ||
7fd1b19b | 347 | _cleanup_free_ char *e = NULL; |
2c7c6144 | 348 | bool delete = false; |
5bcb0f2b | 349 | Unit *u = NULL; |
07b0b134 | 350 | int r; |
4e85aff4 LP |
351 | SwapParameters *p; |
352 | ||
353 | assert(m); | |
354 | assert(what); | |
6b1dc2bd | 355 | assert(what_proc_swaps); |
07b0b134 | 356 | |
7d17cfbc MS |
357 | e = unit_name_from_path(what, ".swap"); |
358 | if (!e) | |
170ca19e | 359 | return log_oom(); |
07b0b134 | 360 | |
e04aad61 LP |
361 | u = manager_get_unit(m, e); |
362 | ||
6b1dc2bd | 363 | if (u && |
e04aad61 LP |
364 | SWAP(u)->from_proc_swaps && |
365 | !path_equal(SWAP(u)->parameters_proc_swaps.what, what_proc_swaps)) | |
366 | return -EEXIST; | |
4e85aff4 LP |
367 | |
368 | if (!u) { | |
07b0b134 ML |
369 | delete = true; |
370 | ||
7d17cfbc | 371 | u = unit_new(m, sizeof(Swap)); |
170ca19e ZJS |
372 | if (!u) |
373 | return log_oom(); | |
e04aad61 | 374 | |
7d17cfbc MS |
375 | r = unit_add_name(u, e); |
376 | if (r < 0) | |
e04aad61 LP |
377 | goto fail; |
378 | ||
7d17cfbc MS |
379 | SWAP(u)->what = strdup(what); |
380 | if (!SWAP(u)->what) { | |
646134dc | 381 | r = log_oom(); |
e04aad61 LP |
382 | goto fail; |
383 | } | |
384 | ||
385 | unit_add_to_load_queue(u); | |
4e85aff4 LP |
386 | } else |
387 | delete = false; | |
07b0b134 | 388 | |
6b1dc2bd | 389 | p = &SWAP(u)->parameters_proc_swaps; |
07b0b134 | 390 | |
6b1dc2bd | 391 | if (!p->what) { |
5bcb0f2b LP |
392 | p->what = strdup(what_proc_swaps); |
393 | if (!p->what) { | |
394 | r = -ENOMEM; | |
6b1dc2bd LP |
395 | goto fail; |
396 | } | |
6b1dc2bd | 397 | } |
e04aad61 | 398 | |
6b1dc2bd LP |
399 | if (set_flags) { |
400 | SWAP(u)->is_active = true; | |
401 | SWAP(u)->just_activated = !SWAP(u)->from_proc_swaps; | |
4e85aff4 | 402 | } |
07b0b134 | 403 | |
6b1dc2bd LP |
404 | SWAP(u)->from_proc_swaps = true; |
405 | ||
4e85aff4 | 406 | p->priority = priority; |
07b0b134 | 407 | |
4e85aff4 | 408 | unit_add_to_dbus_queue(u); |
07b0b134 | 409 | |
07b0b134 ML |
410 | return 0; |
411 | ||
412 | fail: | |
31938a85 | 413 | log_unit_warning_errno(e, r, "Failed to load swap unit: %m"); |
e04aad61 | 414 | |
4e85aff4 | 415 | if (delete && u) |
07b0b134 ML |
416 | unit_free(u); |
417 | ||
4e85aff4 | 418 | return r; |
07b0b134 ML |
419 | } |
420 | ||
e04aad61 | 421 | static int swap_process_new_swap(Manager *m, const char *device, int prio, bool set_flags) { |
5bcb0f2b LP |
422 | _cleanup_udev_device_unref_ struct udev_device *d = NULL; |
423 | struct udev_list_entry *item = NULL, *first = NULL; | |
424 | const char *dn; | |
e04aad61 | 425 | struct stat st; |
5bcb0f2b | 426 | int r; |
e04aad61 LP |
427 | |
428 | assert(m); | |
429 | ||
ddb7d6b9 | 430 | r = swap_add_one(m, device, device, prio, set_flags); |
5bcb0f2b LP |
431 | if (r < 0) |
432 | return r; | |
e04aad61 | 433 | |
5bcb0f2b LP |
434 | /* If this is a block device, then let's add duplicates for |
435 | * all other names of this block device */ | |
436 | if (stat(device, &st) < 0 || !S_ISBLK(st.st_mode)) | |
437 | return 0; | |
e04aad61 | 438 | |
5bcb0f2b LP |
439 | d = udev_device_new_from_devnum(m->udev, 'b', st.st_rdev); |
440 | if (!d) | |
441 | return 0; | |
e04aad61 | 442 | |
5bcb0f2b LP |
443 | /* Add the main device node */ |
444 | dn = udev_device_get_devnode(d); | |
445 | if (dn && !streq(dn, device)) | |
ddb7d6b9 | 446 | swap_add_one(m, dn, device, prio, set_flags); |
e04aad61 | 447 | |
5bcb0f2b LP |
448 | /* Add additional units for all symlinks */ |
449 | first = udev_device_get_devlinks_list_entry(d); | |
450 | udev_list_entry_foreach(item, first) { | |
451 | const char *p; | |
e04aad61 | 452 | |
5bcb0f2b LP |
453 | /* Don't bother with the /dev/block links */ |
454 | p = udev_list_entry_get_name(item); | |
e04aad61 | 455 | |
5bcb0f2b LP |
456 | if (streq(p, device)) |
457 | continue; | |
e04aad61 | 458 | |
5bcb0f2b LP |
459 | if (path_startswith(p, "/dev/block/")) |
460 | continue; | |
e04aad61 | 461 | |
5bcb0f2b LP |
462 | if (stat(p, &st) >= 0) |
463 | if (!S_ISBLK(st.st_mode) || | |
464 | st.st_rdev != udev_device_get_devnum(d)) | |
465 | continue; | |
e04aad61 | 466 | |
ddb7d6b9 | 467 | swap_add_one(m, p, device, prio, set_flags); |
e04aad61 LP |
468 | } |
469 | ||
e04aad61 LP |
470 | return r; |
471 | } | |
472 | ||
07b0b134 ML |
473 | static void swap_set_state(Swap *s, SwapState state) { |
474 | SwapState old_state; | |
e04aad61 | 475 | |
07b0b134 ML |
476 | assert(s); |
477 | ||
478 | old_state = s->state; | |
479 | s->state = state; | |
480 | ||
e04aad61 LP |
481 | if (state != SWAP_ACTIVATING && |
482 | state != SWAP_ACTIVATING_SIGTERM && | |
483 | state != SWAP_ACTIVATING_SIGKILL && | |
5bcb0f2b | 484 | state != SWAP_ACTIVATING_DONE && |
e04aad61 LP |
485 | state != SWAP_DEACTIVATING && |
486 | state != SWAP_DEACTIVATING_SIGTERM && | |
487 | state != SWAP_DEACTIVATING_SIGKILL) { | |
718db961 | 488 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
e04aad61 LP |
489 | swap_unwatch_control_pid(s); |
490 | s->control_command = NULL; | |
491 | s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; | |
492 | } | |
493 | ||
07b0b134 | 494 | if (state != old_state) |
79008bdd | 495 | log_unit_debug(UNIT(s)->id, |
66870f90 ZJS |
496 | "%s changed %s -> %s", |
497 | UNIT(s)->id, | |
498 | swap_state_to_string(old_state), | |
499 | swap_state_to_string(state)); | |
07b0b134 | 500 | |
5bcb0f2b | 501 | unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], true); |
07b0b134 ML |
502 | } |
503 | ||
504 | static int swap_coldplug(Unit *u) { | |
505 | Swap *s = SWAP(u); | |
506 | SwapState new_state = SWAP_DEAD; | |
e04aad61 | 507 | int r; |
07b0b134 ML |
508 | |
509 | assert(s); | |
510 | assert(s->state == SWAP_DEAD); | |
511 | ||
512 | if (s->deserialized_state != s->state) | |
513 | new_state = s->deserialized_state; | |
4e85aff4 | 514 | else if (s->from_proc_swaps) |
07b0b134 ML |
515 | new_state = SWAP_ACTIVE; |
516 | ||
5bcb0f2b LP |
517 | if (new_state == s->state) |
518 | return 0; | |
e04aad61 | 519 | |
5bcb0f2b LP |
520 | if (new_state == SWAP_ACTIVATING || |
521 | new_state == SWAP_ACTIVATING_SIGTERM || | |
522 | new_state == SWAP_ACTIVATING_SIGKILL || | |
523 | new_state == SWAP_ACTIVATING_DONE || | |
524 | new_state == SWAP_DEACTIVATING || | |
525 | new_state == SWAP_DEACTIVATING_SIGTERM || | |
526 | new_state == SWAP_DEACTIVATING_SIGKILL) { | |
e04aad61 | 527 | |
5bcb0f2b LP |
528 | if (s->control_pid <= 0) |
529 | return -EBADMSG; | |
e04aad61 | 530 | |
5bcb0f2b LP |
531 | r = unit_watch_pid(UNIT(s), s->control_pid); |
532 | if (r < 0) | |
533 | return r; | |
e04aad61 | 534 | |
5bcb0f2b LP |
535 | r = swap_arm_timer(s); |
536 | if (r < 0) | |
537 | return r; | |
e04aad61 | 538 | } |
07b0b134 | 539 | |
5bcb0f2b | 540 | swap_set_state(s, new_state); |
07b0b134 ML |
541 | return 0; |
542 | } | |
543 | ||
544 | static void swap_dump(Unit *u, FILE *f, const char *prefix) { | |
545 | Swap *s = SWAP(u); | |
4e85aff4 | 546 | SwapParameters *p; |
07b0b134 ML |
547 | |
548 | assert(s); | |
4e85aff4 LP |
549 | assert(f); |
550 | ||
551 | if (s->from_proc_swaps) | |
552 | p = &s->parameters_proc_swaps; | |
553 | else if (s->from_fragment) | |
554 | p = &s->parameters_fragment; | |
b6bfc7bb LP |
555 | else |
556 | p = NULL; | |
07b0b134 ML |
557 | |
558 | fprintf(f, | |
4e85aff4 | 559 | "%sSwap State: %s\n" |
e1770af8 | 560 | "%sResult: %s\n" |
07b0b134 | 561 | "%sWhat: %s\n" |
4e85aff4 LP |
562 | "%sFrom /proc/swaps: %s\n" |
563 | "%sFrom fragment: %s\n", | |
07b0b134 | 564 | prefix, swap_state_to_string(s->state), |
e1770af8 | 565 | prefix, swap_result_to_string(s->result), |
07b0b134 | 566 | prefix, s->what, |
4e85aff4 LP |
567 | prefix, yes_no(s->from_proc_swaps), |
568 | prefix, yes_no(s->from_fragment)); | |
e04aad61 | 569 | |
9670d583 LP |
570 | if (s->devnode) |
571 | fprintf(f, "%sDevice Node: %s\n", prefix, s->devnode); | |
572 | ||
b6bfc7bb LP |
573 | if (p) |
574 | fprintf(f, | |
575 | "%sPriority: %i\n" | |
47cb901e | 576 | "%sOptions: %s\n", |
b6bfc7bb | 577 | prefix, p->priority, |
47cb901e | 578 | prefix, strempty(p->options)); |
b6bfc7bb | 579 | |
e04aad61 LP |
580 | if (s->control_pid > 0) |
581 | fprintf(f, | |
de0671ee ZJS |
582 | "%sControl PID: "PID_FMT"\n", |
583 | prefix, s->control_pid); | |
e04aad61 LP |
584 | |
585 | exec_context_dump(&s->exec_context, f, prefix); | |
4819ff03 | 586 | kill_context_dump(&s->kill_context, f, prefix); |
e04aad61 LP |
587 | } |
588 | ||
589 | static int swap_spawn(Swap *s, ExecCommand *c, pid_t *_pid) { | |
590 | pid_t pid; | |
591 | int r; | |
9fa95f85 DM |
592 | ExecParameters exec_params = { |
593 | .apply_permissions = true, | |
594 | .apply_chroot = true, | |
595 | .apply_tty_stdin = true, | |
596 | }; | |
e04aad61 LP |
597 | |
598 | assert(s); | |
599 | assert(c); | |
600 | assert(_pid); | |
601 | ||
4ad49000 LP |
602 | unit_realize_cgroup(UNIT(s)); |
603 | ||
613b411c LP |
604 | r = unit_setup_exec_runtime(UNIT(s)); |
605 | if (r < 0) | |
606 | goto fail; | |
607 | ||
718db961 | 608 | r = swap_arm_timer(s); |
646134dc | 609 | if (r < 0) |
e04aad61 LP |
610 | goto fail; |
611 | ||
9fa95f85 DM |
612 | exec_params.environment = UNIT(s)->manager->environment; |
613 | exec_params.confirm_spawn = UNIT(s)->manager->confirm_spawn; | |
614 | exec_params.cgroup_supported = UNIT(s)->manager->cgroup_supported; | |
615 | exec_params.cgroup_path = UNIT(s)->cgroup_path; | |
a931ad47 | 616 | exec_params.cgroup_delegate = s->cgroup_context.delegate; |
9fa95f85 DM |
617 | exec_params.runtime_prefix = manager_get_runtime_prefix(UNIT(s)->manager); |
618 | exec_params.unit_id = UNIT(s)->id; | |
619 | ||
646134dc | 620 | r = exec_spawn(c, |
646134dc | 621 | &s->exec_context, |
9fa95f85 | 622 | &exec_params, |
613b411c | 623 | s->exec_runtime, |
646134dc ZJS |
624 | &pid); |
625 | if (r < 0) | |
e04aad61 LP |
626 | goto fail; |
627 | ||
646134dc ZJS |
628 | r = unit_watch_pid(UNIT(s), pid); |
629 | if (r < 0) | |
e04aad61 LP |
630 | /* FIXME: we need to do something here */ |
631 | goto fail; | |
632 | ||
633 | *_pid = pid; | |
634 | ||
635 | return 0; | |
636 | ||
637 | fail: | |
718db961 | 638 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
e04aad61 LP |
639 | |
640 | return r; | |
07b0b134 ML |
641 | } |
642 | ||
e1770af8 | 643 | static void swap_enter_dead(Swap *s, SwapResult f) { |
07b0b134 ML |
644 | assert(s); |
645 | ||
e1770af8 LP |
646 | if (f != SWAP_SUCCESS) |
647 | s->result = f; | |
e04aad61 | 648 | |
613b411c LP |
649 | exec_runtime_destroy(s->exec_runtime); |
650 | s->exec_runtime = exec_runtime_unref(s->exec_runtime); | |
651 | ||
e66cf1a3 LP |
652 | exec_context_destroy_runtime_directory(&s->exec_context, manager_get_runtime_prefix(UNIT(s)->manager)); |
653 | ||
e1770af8 | 654 | swap_set_state(s, s->result != SWAP_SUCCESS ? SWAP_FAILED : SWAP_DEAD); |
07b0b134 ML |
655 | } |
656 | ||
e1770af8 | 657 | static void swap_enter_active(Swap *s, SwapResult f) { |
e04aad61 LP |
658 | assert(s); |
659 | ||
e1770af8 LP |
660 | if (f != SWAP_SUCCESS) |
661 | s->result = f; | |
e04aad61 LP |
662 | |
663 | swap_set_state(s, SWAP_ACTIVE); | |
664 | } | |
665 | ||
e1770af8 | 666 | static void swap_enter_signal(Swap *s, SwapState state, SwapResult f) { |
07b0b134 ML |
667 | int r; |
668 | ||
669 | assert(s); | |
e04aad61 | 670 | |
e1770af8 LP |
671 | if (f != SWAP_SUCCESS) |
672 | s->result = f; | |
e04aad61 | 673 | |
cd2086fe LP |
674 | r = unit_kill_context( |
675 | UNIT(s), | |
676 | &s->kill_context, | |
db2cb23b UTL |
677 | (state != SWAP_ACTIVATING_SIGTERM && state != SWAP_DEACTIVATING_SIGTERM) ? |
678 | KILL_KILL : KILL_TERMINATE, | |
cd2086fe LP |
679 | -1, |
680 | s->control_pid, | |
681 | false); | |
682 | if (r < 0) | |
683 | goto fail; | |
e04aad61 | 684 | |
cd2086fe | 685 | if (r > 0) { |
718db961 | 686 | r = swap_arm_timer(s); |
646134dc | 687 | if (r < 0) |
e04aad61 LP |
688 | goto fail; |
689 | ||
690 | swap_set_state(s, state); | |
ac84d1fb LP |
691 | } else if (state == SWAP_ACTIVATING_SIGTERM) |
692 | swap_enter_signal(s, SWAP_ACTIVATING_SIGKILL, SWAP_SUCCESS); | |
693 | else if (state == SWAP_DEACTIVATING_SIGTERM) | |
694 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, SWAP_SUCCESS); | |
695 | else | |
e1770af8 | 696 | swap_enter_dead(s, SWAP_SUCCESS); |
e04aad61 LP |
697 | |
698 | return; | |
699 | ||
700 | fail: | |
79008bdd | 701 | log_unit_warning(UNIT(s)->id, |
66870f90 | 702 | "%s failed to kill processes: %s", UNIT(s)->id, strerror(-r)); |
e04aad61 | 703 | |
e1770af8 | 704 | swap_enter_dead(s, SWAP_FAILURE_RESOURCES); |
e04aad61 LP |
705 | } |
706 | ||
47cb901e LP |
707 | static int mount_find_pri(const char *options, int *ret) { |
708 | const char *opt; | |
709 | char *end; | |
710 | unsigned long r; | |
711 | ||
712 | assert(ret); | |
713 | ||
714 | if (!options) | |
715 | return 0; | |
716 | ||
717 | opt = mount_test_option(options, "pri"); | |
718 | if (!opt) | |
719 | return 0; | |
720 | ||
721 | opt += strlen("pri"); | |
722 | if (*opt != '=') | |
723 | return -EINVAL; | |
724 | ||
725 | errno = 0; | |
726 | r = strtoul(opt + 1, &end, 10); | |
727 | if (errno > 0) | |
728 | return -errno; | |
729 | ||
730 | if (end == opt + 1 || (*end != ',' && *end != 0)) | |
731 | return -EINVAL; | |
732 | ||
733 | *ret = (int) r; | |
734 | return 1; | |
735 | } | |
736 | ||
737 | static int mount_find_discard(const char *options, char **ret) { | |
738 | const char *opt; | |
739 | char *ans; | |
740 | size_t len; | |
741 | ||
742 | assert(ret); | |
743 | ||
744 | if (!options) | |
745 | return 0; | |
746 | ||
747 | opt = mount_test_option(options, "discard"); | |
748 | if (!opt) | |
749 | return 0; | |
750 | ||
751 | opt += strlen("discard"); | |
752 | if (*opt == ',' || *opt == '\0') | |
753 | ans = strdup("all"); | |
754 | else { | |
755 | if (*opt != '=') | |
756 | return -EINVAL; | |
757 | ||
758 | len = strcspn(opt + 1, ","); | |
759 | if (len == 0) | |
760 | return -EINVAL; | |
761 | ||
762 | ans = strndup(opt + 1, len); | |
763 | } | |
764 | ||
765 | if (!ans) | |
766 | return -ENOMEM; | |
767 | ||
768 | *ret = ans; | |
769 | return 1; | |
770 | } | |
771 | ||
e04aad61 | 772 | static void swap_enter_activating(Swap *s) { |
47cb901e LP |
773 | _cleanup_free_ char *discard = NULL; |
774 | int r, priority = -1; | |
e04aad61 LP |
775 | |
776 | assert(s); | |
777 | ||
778 | s->control_command_id = SWAP_EXEC_ACTIVATE; | |
779 | s->control_command = s->exec_command + SWAP_EXEC_ACTIVATE; | |
07b0b134 | 780 | |
86b23b07 | 781 | if (s->from_fragment) { |
47cb901e LP |
782 | mount_find_discard(s->parameters_fragment.options, &discard); |
783 | ||
4e85aff4 | 784 | priority = s->parameters_fragment.priority; |
47cb901e LP |
785 | if (priority < 0) |
786 | mount_find_pri(s->parameters_fragment.options, &priority); | |
86b23b07 JS |
787 | } |
788 | ||
789 | r = exec_command_set(s->control_command, "/sbin/swapon", NULL); | |
790 | if (r < 0) | |
791 | goto fail; | |
4e85aff4 | 792 | |
e04aad61 | 793 | if (priority >= 0) { |
5bcb0f2b | 794 | char p[DECIMAL_STR_MAX(int)]; |
07b0b134 | 795 | |
5bcb0f2b | 796 | sprintf(p, "%i", priority); |
86b23b07 JS |
797 | r = exec_command_append(s->control_command, "-p", p, NULL); |
798 | if (r < 0) | |
799 | goto fail; | |
800 | } | |
07b0b134 | 801 | |
86b23b07 | 802 | if (discard && !streq(discard, "none")) { |
47cb901e | 803 | const char *discard_arg; |
86b23b07 | 804 | |
47cb901e LP |
805 | if (streq(discard, "all")) |
806 | discard_arg = "--discard"; | |
807 | else | |
86b23b07 JS |
808 | discard_arg = strappenda("--discard=", discard); |
809 | ||
810 | r = exec_command_append(s->control_command, discard_arg, NULL); | |
811 | if (r < 0) | |
812 | goto fail; | |
813 | } | |
e04aad61 | 814 | |
86b23b07 | 815 | r = exec_command_append(s->control_command, s->what, NULL); |
e04aad61 LP |
816 | if (r < 0) |
817 | goto fail; | |
818 | ||
819 | swap_unwatch_control_pid(s); | |
820 | ||
646134dc ZJS |
821 | r = swap_spawn(s, s->control_command, &s->control_pid); |
822 | if (r < 0) | |
e04aad61 LP |
823 | goto fail; |
824 | ||
825 | swap_set_state(s, SWAP_ACTIVATING); | |
826 | ||
827 | return; | |
828 | ||
829 | fail: | |
79008bdd | 830 | log_unit_warning(UNIT(s)->id, |
66870f90 ZJS |
831 | "%s failed to run 'swapon' task: %s", |
832 | UNIT(s)->id, strerror(-r)); | |
e1770af8 | 833 | swap_enter_dead(s, SWAP_FAILURE_RESOURCES); |
e04aad61 LP |
834 | } |
835 | ||
e1770af8 | 836 | static void swap_enter_deactivating(Swap *s) { |
e04aad61 LP |
837 | int r; |
838 | ||
839 | assert(s); | |
840 | ||
e04aad61 LP |
841 | s->control_command_id = SWAP_EXEC_DEACTIVATE; |
842 | s->control_command = s->exec_command + SWAP_EXEC_DEACTIVATE; | |
843 | ||
646134dc | 844 | r = exec_command_set(s->control_command, |
e04aad61 LP |
845 | "/sbin/swapoff", |
846 | s->what, | |
646134dc ZJS |
847 | NULL); |
848 | if (r < 0) | |
e04aad61 LP |
849 | goto fail; |
850 | ||
851 | swap_unwatch_control_pid(s); | |
852 | ||
646134dc ZJS |
853 | r = swap_spawn(s, s->control_command, &s->control_pid); |
854 | if (r < 0) | |
e04aad61 LP |
855 | goto fail; |
856 | ||
857 | swap_set_state(s, SWAP_DEACTIVATING); | |
858 | ||
859 | return; | |
860 | ||
861 | fail: | |
79008bdd | 862 | log_unit_warning(UNIT(s)->id, |
66870f90 ZJS |
863 | "%s failed to run 'swapoff' task: %s", |
864 | UNIT(s)->id, strerror(-r)); | |
e1770af8 | 865 | swap_enter_active(s, SWAP_FAILURE_RESOURCES); |
e04aad61 LP |
866 | } |
867 | ||
868 | static int swap_start(Unit *u) { | |
869 | Swap *s = SWAP(u); | |
870 | ||
871 | assert(s); | |
872 | ||
873 | /* We cannot fulfill this request right now, try again later | |
874 | * please! */ | |
875 | ||
876 | if (s->state == SWAP_DEACTIVATING || | |
877 | s->state == SWAP_DEACTIVATING_SIGTERM || | |
878 | s->state == SWAP_DEACTIVATING_SIGKILL || | |
879 | s->state == SWAP_ACTIVATING_SIGTERM || | |
880 | s->state == SWAP_ACTIVATING_SIGKILL) | |
881 | return -EAGAIN; | |
882 | ||
883 | if (s->state == SWAP_ACTIVATING) | |
884 | return 0; | |
885 | ||
886 | assert(s->state == SWAP_DEAD || s->state == SWAP_FAILED); | |
887 | ||
a5c3034f LP |
888 | if (detect_container(NULL) > 0) |
889 | return -EPERM; | |
890 | ||
e1770af8 | 891 | s->result = SWAP_SUCCESS; |
e04aad61 | 892 | swap_enter_activating(s); |
07b0b134 ML |
893 | return 0; |
894 | } | |
895 | ||
896 | static int swap_stop(Unit *u) { | |
897 | Swap *s = SWAP(u); | |
07b0b134 ML |
898 | |
899 | assert(s); | |
900 | ||
e04aad61 LP |
901 | if (s->state == SWAP_DEACTIVATING || |
902 | s->state == SWAP_DEACTIVATING_SIGTERM || | |
903 | s->state == SWAP_DEACTIVATING_SIGKILL || | |
904 | s->state == SWAP_ACTIVATING_SIGTERM || | |
905 | s->state == SWAP_ACTIVATING_SIGKILL) | |
906 | return 0; | |
07b0b134 | 907 | |
e04aad61 | 908 | assert(s->state == SWAP_ACTIVATING || |
5bcb0f2b | 909 | s->state == SWAP_ACTIVATING_DONE || |
e04aad61 | 910 | s->state == SWAP_ACTIVE); |
07b0b134 | 911 | |
a5c3034f LP |
912 | if (detect_container(NULL) > 0) |
913 | return -EPERM; | |
914 | ||
e1770af8 | 915 | swap_enter_deactivating(s); |
07b0b134 ML |
916 | return 0; |
917 | } | |
918 | ||
919 | static int swap_serialize(Unit *u, FILE *f, FDSet *fds) { | |
920 | Swap *s = SWAP(u); | |
921 | ||
922 | assert(s); | |
923 | assert(f); | |
924 | assert(fds); | |
925 | ||
926 | unit_serialize_item(u, f, "state", swap_state_to_string(s->state)); | |
e1770af8 | 927 | unit_serialize_item(u, f, "result", swap_result_to_string(s->result)); |
e04aad61 LP |
928 | |
929 | if (s->control_pid > 0) | |
de0671ee | 930 | unit_serialize_item_format(u, f, "control-pid", PID_FMT, s->control_pid); |
e04aad61 LP |
931 | |
932 | if (s->control_command_id >= 0) | |
933 | unit_serialize_item(u, f, "control-command", swap_exec_command_to_string(s->control_command_id)); | |
07b0b134 ML |
934 | |
935 | return 0; | |
936 | } | |
937 | ||
938 | static int swap_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
939 | Swap *s = SWAP(u); | |
940 | ||
941 | assert(s); | |
942 | assert(fds); | |
943 | ||
944 | if (streq(key, "state")) { | |
945 | SwapState state; | |
946 | ||
646134dc ZJS |
947 | state = swap_state_from_string(value); |
948 | if (state < 0) | |
79008bdd | 949 | log_unit_debug(u->id, "Failed to parse state value %s", value); |
07b0b134 ML |
950 | else |
951 | s->deserialized_state = state; | |
e1770af8 LP |
952 | } else if (streq(key, "result")) { |
953 | SwapResult f; | |
954 | ||
955 | f = swap_result_from_string(value); | |
956 | if (f < 0) | |
79008bdd | 957 | log_unit_debug(u->id, "Failed to parse result value %s", value); |
e1770af8 LP |
958 | else if (f != SWAP_SUCCESS) |
959 | s->result = f; | |
e04aad61 LP |
960 | } else if (streq(key, "control-pid")) { |
961 | pid_t pid; | |
962 | ||
963 | if (parse_pid(value, &pid) < 0) | |
79008bdd | 964 | log_unit_debug(u->id, "Failed to parse control-pid value %s", value); |
e04aad61 LP |
965 | else |
966 | s->control_pid = pid; | |
967 | ||
968 | } else if (streq(key, "control-command")) { | |
969 | SwapExecCommand id; | |
970 | ||
646134dc ZJS |
971 | id = swap_exec_command_from_string(value); |
972 | if (id < 0) | |
79008bdd | 973 | log_unit_debug(u->id, "Failed to parse exec-command value %s", value); |
e04aad61 LP |
974 | else { |
975 | s->control_command_id = id; | |
976 | s->control_command = s->exec_command + id; | |
977 | } | |
07b0b134 | 978 | } else |
79008bdd | 979 | log_unit_debug(u->id, "Unknown serialization key '%s'", key); |
07b0b134 ML |
980 | |
981 | return 0; | |
982 | } | |
983 | ||
44a6b1b6 | 984 | _pure_ static UnitActiveState swap_active_state(Unit *u) { |
07b0b134 ML |
985 | assert(u); |
986 | ||
987 | return state_translation_table[SWAP(u)->state]; | |
988 | } | |
989 | ||
44a6b1b6 | 990 | _pure_ static const char *swap_sub_state_to_string(Unit *u) { |
07b0b134 ML |
991 | assert(u); |
992 | ||
993 | return swap_state_to_string(SWAP(u)->state); | |
994 | } | |
995 | ||
44a6b1b6 | 996 | _pure_ static bool swap_check_gc(Unit *u) { |
07b0b134 ML |
997 | Swap *s = SWAP(u); |
998 | ||
999 | assert(s); | |
1000 | ||
6b1dc2bd | 1001 | return s->from_proc_swaps; |
07b0b134 ML |
1002 | } |
1003 | ||
e04aad61 LP |
1004 | static void swap_sigchld_event(Unit *u, pid_t pid, int code, int status) { |
1005 | Swap *s = SWAP(u); | |
e1770af8 | 1006 | SwapResult f; |
e04aad61 LP |
1007 | |
1008 | assert(s); | |
1009 | assert(pid >= 0); | |
1010 | ||
1011 | if (pid != s->control_pid) | |
1012 | return; | |
1013 | ||
1014 | s->control_pid = 0; | |
1015 | ||
96342de6 | 1016 | if (is_clean_exit(code, status, NULL)) |
e1770af8 LP |
1017 | f = SWAP_SUCCESS; |
1018 | else if (code == CLD_EXITED) | |
1019 | f = SWAP_FAILURE_EXIT_CODE; | |
1020 | else if (code == CLD_KILLED) | |
1021 | f = SWAP_FAILURE_SIGNAL; | |
1022 | else if (code == CLD_DUMPED) | |
1023 | f = SWAP_FAILURE_CORE_DUMP; | |
1024 | else | |
1025 | assert_not_reached("Unknown code"); | |
1026 | ||
1027 | if (f != SWAP_SUCCESS) | |
1028 | s->result = f; | |
e04aad61 LP |
1029 | |
1030 | if (s->control_command) { | |
6ea832a2 | 1031 | exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status); |
e1770af8 | 1032 | |
e04aad61 LP |
1033 | s->control_command = NULL; |
1034 | s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; | |
1035 | } | |
1036 | ||
79008bdd LP |
1037 | log_unit_full(u->id, |
1038 | f == SWAP_SUCCESS ? LOG_DEBUG : LOG_NOTICE, | |
66870f90 ZJS |
1039 | "%s swap process exited, code=%s status=%i", |
1040 | u->id, sigchld_code_to_string(code), status); | |
e04aad61 LP |
1041 | |
1042 | switch (s->state) { | |
1043 | ||
1044 | case SWAP_ACTIVATING: | |
5bcb0f2b | 1045 | case SWAP_ACTIVATING_DONE: |
e04aad61 LP |
1046 | case SWAP_ACTIVATING_SIGTERM: |
1047 | case SWAP_ACTIVATING_SIGKILL: | |
1048 | ||
e1770af8 LP |
1049 | if (f == SWAP_SUCCESS) |
1050 | swap_enter_active(s, f); | |
e04aad61 | 1051 | else |
e1770af8 | 1052 | swap_enter_dead(s, f); |
e04aad61 LP |
1053 | break; |
1054 | ||
1055 | case SWAP_DEACTIVATING: | |
1056 | case SWAP_DEACTIVATING_SIGKILL: | |
1057 | case SWAP_DEACTIVATING_SIGTERM: | |
1058 | ||
7bb01eff | 1059 | swap_enter_dead(s, f); |
e04aad61 LP |
1060 | break; |
1061 | ||
1062 | default: | |
1063 | assert_not_reached("Uh, control process died at wrong time."); | |
1064 | } | |
1065 | ||
1066 | /* Notify clients about changed exit status */ | |
1067 | unit_add_to_dbus_queue(u); | |
e04aad61 LP |
1068 | } |
1069 | ||
718db961 LP |
1070 | static int swap_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) { |
1071 | Swap *s = SWAP(userdata); | |
e04aad61 LP |
1072 | |
1073 | assert(s); | |
718db961 | 1074 | assert(s->timer_event_source == source); |
e04aad61 LP |
1075 | |
1076 | switch (s->state) { | |
1077 | ||
1078 | case SWAP_ACTIVATING: | |
5bcb0f2b | 1079 | case SWAP_ACTIVATING_DONE: |
79008bdd | 1080 | log_unit_warning(UNIT(s)->id, "%s activation timed out. Stopping.", UNIT(s)->id); |
e1770af8 | 1081 | swap_enter_signal(s, SWAP_ACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT); |
e04aad61 LP |
1082 | break; |
1083 | ||
1084 | case SWAP_DEACTIVATING: | |
79008bdd | 1085 | log_unit_warning(UNIT(s)->id, "%s deactivation timed out. Stopping.", UNIT(s)->id); |
e1770af8 | 1086 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT); |
e04aad61 LP |
1087 | break; |
1088 | ||
1089 | case SWAP_ACTIVATING_SIGTERM: | |
4819ff03 | 1090 | if (s->kill_context.send_sigkill) { |
79008bdd | 1091 | log_unit_warning(UNIT(s)->id, "%s activation timed out. Killing.", UNIT(s)->id); |
e1770af8 | 1092 | swap_enter_signal(s, SWAP_ACTIVATING_SIGKILL, SWAP_FAILURE_TIMEOUT); |
ba035df2 | 1093 | } else { |
79008bdd | 1094 | log_unit_warning(UNIT(s)->id, "%s activation timed out. Skipping SIGKILL. Ignoring.", UNIT(s)->id); |
e1770af8 | 1095 | swap_enter_dead(s, SWAP_FAILURE_TIMEOUT); |
ba035df2 | 1096 | } |
e04aad61 LP |
1097 | break; |
1098 | ||
1099 | case SWAP_DEACTIVATING_SIGTERM: | |
4819ff03 | 1100 | if (s->kill_context.send_sigkill) { |
79008bdd | 1101 | log_unit_warning(UNIT(s)->id, "%s deactivation timed out. Killing.", UNIT(s)->id); |
e1770af8 | 1102 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, SWAP_FAILURE_TIMEOUT); |
ba035df2 | 1103 | } else { |
79008bdd | 1104 | log_unit_warning(UNIT(s)->id, "%s deactivation timed out. Skipping SIGKILL. Ignoring.", UNIT(s)->id); |
e1770af8 | 1105 | swap_enter_dead(s, SWAP_FAILURE_TIMEOUT); |
ba035df2 | 1106 | } |
e04aad61 LP |
1107 | break; |
1108 | ||
1109 | case SWAP_ACTIVATING_SIGKILL: | |
1110 | case SWAP_DEACTIVATING_SIGKILL: | |
79008bdd | 1111 | log_unit_warning(UNIT(s)->id, "%s swap process still around after SIGKILL. Ignoring.", UNIT(s)->id); |
e1770af8 | 1112 | swap_enter_dead(s, SWAP_FAILURE_TIMEOUT); |
e04aad61 LP |
1113 | break; |
1114 | ||
1115 | default: | |
1116 | assert_not_reached("Timeout at wrong time."); | |
1117 | } | |
718db961 LP |
1118 | |
1119 | return 0; | |
e04aad61 LP |
1120 | } |
1121 | ||
1122 | static int swap_load_proc_swaps(Manager *m, bool set_flags) { | |
1123 | unsigned i; | |
1124 | int r = 0; | |
1125 | ||
1126 | assert(m); | |
1127 | ||
07b0b134 | 1128 | rewind(m->proc_swaps); |
bab45044 | 1129 | |
4e85aff4 | 1130 | (void) fscanf(m->proc_swaps, "%*s %*s %*s %*s %*s\n"); |
07b0b134 | 1131 | |
e04aad61 | 1132 | for (i = 1;; i++) { |
9fb3675e | 1133 | _cleanup_free_ char *dev = NULL, *d = NULL; |
07b0b134 ML |
1134 | int prio = 0, k; |
1135 | ||
646134dc ZJS |
1136 | k = fscanf(m->proc_swaps, |
1137 | "%ms " /* device/file */ | |
1138 | "%*s " /* type of swap */ | |
1139 | "%*s " /* swap size */ | |
1140 | "%*s " /* used */ | |
1141 | "%i\n", /* priority */ | |
1142 | &dev, &prio); | |
1143 | if (k != 2) { | |
07b0b134 | 1144 | if (k == EOF) |
4e85aff4 | 1145 | break; |
07b0b134 | 1146 | |
646134dc | 1147 | log_warning("Failed to parse /proc/swaps:%u", i); |
e04aad61 | 1148 | continue; |
07b0b134 | 1149 | } |
07b0b134 | 1150 | |
4e85aff4 | 1151 | d = cunescape(dev); |
4e85aff4 LP |
1152 | if (!d) |
1153 | return -ENOMEM; | |
1154 | ||
e04aad61 | 1155 | k = swap_process_new_swap(m, d, prio, set_flags); |
07b0b134 | 1156 | if (k < 0) |
e04aad61 | 1157 | r = k; |
07b0b134 ML |
1158 | } |
1159 | ||
e04aad61 LP |
1160 | return r; |
1161 | } | |
1162 | ||
718db961 LP |
1163 | static int swap_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) { |
1164 | Manager *m = userdata; | |
595ed347 | 1165 | Unit *u; |
4e434314 LP |
1166 | int r; |
1167 | ||
1168 | assert(m); | |
718db961 | 1169 | assert(revents & EPOLLPRI); |
4e434314 | 1170 | |
646134dc ZJS |
1171 | r = swap_load_proc_swaps(m, true); |
1172 | if (r < 0) { | |
da927ba9 | 1173 | log_error_errno(r, "Failed to reread /proc/swaps: %m"); |
e04aad61 LP |
1174 | |
1175 | /* Reset flags, just in case, for late calls */ | |
595ed347 MS |
1176 | LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) { |
1177 | Swap *swap = SWAP(u); | |
e04aad61 LP |
1178 | |
1179 | swap->is_active = swap->just_activated = false; | |
1180 | } | |
1181 | ||
1182 | return 0; | |
1183 | } | |
1184 | ||
1185 | manager_dispatch_load_queue(m); | |
1186 | ||
595ed347 MS |
1187 | LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) { |
1188 | Swap *swap = SWAP(u); | |
e04aad61 LP |
1189 | |
1190 | if (!swap->is_active) { | |
1191 | /* This has just been deactivated */ | |
1192 | ||
e04aad61 LP |
1193 | swap_unset_proc_swaps(swap); |
1194 | ||
1195 | switch (swap->state) { | |
1196 | ||
1197 | case SWAP_ACTIVE: | |
e1770af8 | 1198 | swap_enter_dead(swap, SWAP_SUCCESS); |
e04aad61 LP |
1199 | break; |
1200 | ||
1201 | default: | |
5bcb0f2b | 1202 | /* Fire again */ |
e04aad61 LP |
1203 | swap_set_state(swap, swap->state); |
1204 | break; | |
1205 | } | |
1206 | ||
1207 | } else if (swap->just_activated) { | |
1208 | ||
1209 | /* New swap entry */ | |
1210 | ||
1211 | switch (swap->state) { | |
1212 | ||
1213 | case SWAP_DEAD: | |
1214 | case SWAP_FAILED: | |
e1770af8 | 1215 | swap_enter_active(swap, SWAP_SUCCESS); |
e04aad61 LP |
1216 | break; |
1217 | ||
5bcb0f2b LP |
1218 | case SWAP_ACTIVATING: |
1219 | swap_set_state(swap, SWAP_ACTIVATING_DONE); | |
1220 | break; | |
1221 | ||
e04aad61 LP |
1222 | default: |
1223 | /* Nothing really changed, but let's | |
1224 | * issue an notification call | |
1225 | * nonetheless, in case somebody is | |
1226 | * waiting for this. */ | |
1227 | swap_set_state(swap, swap->state); | |
1228 | break; | |
1229 | } | |
1230 | } | |
1231 | ||
1232 | /* Reset the flags for later calls */ | |
1233 | swap->is_active = swap->just_activated = false; | |
1234 | } | |
1235 | ||
1236 | return 1; | |
1237 | } | |
1238 | ||
1239 | static Unit *swap_following(Unit *u) { | |
1240 | Swap *s = SWAP(u); | |
1241 | Swap *other, *first = NULL; | |
1242 | ||
1243 | assert(s); | |
1244 | ||
cdc89820 ZJS |
1245 | /* If the user configured the swap through /etc/fstab or |
1246 | * a device unit, follow that. */ | |
1247 | ||
1248 | if (s->from_fragment) | |
e04aad61 LP |
1249 | return NULL; |
1250 | ||
cdc89820 ZJS |
1251 | LIST_FOREACH_AFTER(same_devnode, other, s) |
1252 | if (other->from_fragment) | |
1253 | return UNIT(other); | |
1254 | ||
1255 | LIST_FOREACH_BEFORE(same_devnode, other, s) | |
1256 | if (other->from_fragment) | |
1257 | return UNIT(other); | |
1258 | ||
1259 | /* Otherwise make everybody follow the unit that's named after | |
1260 | * the swap device in the kernel */ | |
1261 | ||
1262 | if (streq_ptr(s->what, s->devnode)) | |
1263 | return NULL; | |
e04aad61 | 1264 | |
9670d583 LP |
1265 | LIST_FOREACH_AFTER(same_devnode, other, s) |
1266 | if (streq_ptr(other->what, other->devnode)) | |
e04aad61 LP |
1267 | return UNIT(other); |
1268 | ||
9670d583 LP |
1269 | LIST_FOREACH_BEFORE(same_devnode, other, s) { |
1270 | if (streq_ptr(other->what, other->devnode)) | |
e04aad61 LP |
1271 | return UNIT(other); |
1272 | ||
1273 | first = other; | |
1274 | } | |
1275 | ||
cdc89820 | 1276 | /* Fall back to the first on the list */ |
e04aad61 | 1277 | return UNIT(first); |
07b0b134 ML |
1278 | } |
1279 | ||
6210e7fc | 1280 | static int swap_following_set(Unit *u, Set **_set) { |
5bcb0f2b | 1281 | Swap *s = SWAP(u), *other; |
6210e7fc LP |
1282 | Set *set; |
1283 | int r; | |
1284 | ||
1285 | assert(s); | |
1286 | assert(_set); | |
1287 | ||
9670d583 | 1288 | if (LIST_JUST_US(same_devnode, s)) { |
6210e7fc LP |
1289 | *_set = NULL; |
1290 | return 0; | |
1291 | } | |
1292 | ||
d5099efc | 1293 | set = set_new(NULL); |
5bcb0f2b | 1294 | if (!set) |
6210e7fc LP |
1295 | return -ENOMEM; |
1296 | ||
9670d583 | 1297 | LIST_FOREACH_AFTER(same_devnode, other, s) { |
5bcb0f2b LP |
1298 | r = set_put(set, other); |
1299 | if (r < 0) | |
6210e7fc | 1300 | goto fail; |
5bcb0f2b | 1301 | } |
6210e7fc | 1302 | |
9670d583 | 1303 | LIST_FOREACH_BEFORE(same_devnode, other, s) { |
5bcb0f2b LP |
1304 | r = set_put(set, other); |
1305 | if (r < 0) | |
6210e7fc | 1306 | goto fail; |
5bcb0f2b | 1307 | } |
6210e7fc LP |
1308 | |
1309 | *_set = set; | |
1310 | return 1; | |
1311 | ||
1312 | fail: | |
1313 | set_free(set); | |
1314 | return r; | |
1315 | } | |
1316 | ||
07b0b134 ML |
1317 | static void swap_shutdown(Manager *m) { |
1318 | assert(m); | |
1319 | ||
718db961 LP |
1320 | m->swap_event_source = sd_event_source_unref(m->swap_event_source); |
1321 | ||
07b0b134 ML |
1322 | if (m->proc_swaps) { |
1323 | fclose(m->proc_swaps); | |
1324 | m->proc_swaps = NULL; | |
1325 | } | |
e04aad61 | 1326 | |
9670d583 LP |
1327 | hashmap_free(m->swaps_by_devnode); |
1328 | m->swaps_by_devnode = NULL; | |
07b0b134 ML |
1329 | } |
1330 | ||
07b0b134 ML |
1331 | static int swap_enumerate(Manager *m) { |
1332 | int r; | |
9670d583 | 1333 | |
07b0b134 ML |
1334 | assert(m); |
1335 | ||
4e434314 | 1336 | if (!m->proc_swaps) { |
646134dc ZJS |
1337 | m->proc_swaps = fopen("/proc/swaps", "re"); |
1338 | if (!m->proc_swaps) | |
718db961 | 1339 | return errno == ENOENT ? 0 : -errno; |
4e434314 | 1340 | |
151b9b96 | 1341 | r = sd_event_add_io(m->event, &m->swap_event_source, fileno(m->proc_swaps), EPOLLPRI, swap_dispatch_io, m); |
718db961 | 1342 | if (r < 0) |
29083707 LP |
1343 | goto fail; |
1344 | ||
1345 | /* Dispatch this before we dispatch SIGCHLD, so that | |
1346 | * we always get the events from /proc/swaps before | |
1347 | * the SIGCHLD of /sbin/swapon. */ | |
1348 | r = sd_event_source_set_priority(m->swap_event_source, -10); | |
1349 | if (r < 0) | |
718db961 | 1350 | goto fail; |
4e434314 LP |
1351 | } |
1352 | ||
646134dc ZJS |
1353 | r = swap_load_proc_swaps(m, false); |
1354 | if (r < 0) | |
718db961 LP |
1355 | goto fail; |
1356 | ||
1357 | return 0; | |
07b0b134 | 1358 | |
718db961 LP |
1359 | fail: |
1360 | swap_shutdown(m); | |
07b0b134 ML |
1361 | return r; |
1362 | } | |
1363 | ||
9670d583 LP |
1364 | int swap_process_new_device(Manager *m, struct udev_device *dev) { |
1365 | struct udev_list_entry *item = NULL, *first = NULL; | |
1366 | _cleanup_free_ char *e = NULL; | |
1367 | const char *dn; | |
1368 | Swap *s; | |
1369 | int r = 0; | |
1370 | ||
1371 | assert(m); | |
1372 | assert(dev); | |
1373 | ||
1374 | dn = udev_device_get_devnode(dev); | |
1375 | if (!dn) | |
1376 | return 0; | |
1377 | ||
1378 | e = unit_name_from_path(dn, ".swap"); | |
1379 | if (!e) | |
1380 | return -ENOMEM; | |
1381 | ||
1382 | s = hashmap_get(m->units, e); | |
1383 | if (s) | |
1384 | r = swap_set_devnode(s, dn); | |
1385 | ||
1386 | first = udev_device_get_devlinks_list_entry(dev); | |
1387 | udev_list_entry_foreach(item, first) { | |
1388 | _cleanup_free_ char *n = NULL; | |
1389 | ||
1390 | n = unit_name_from_path(udev_list_entry_get_name(item), ".swap"); | |
1391 | if (!n) | |
1392 | return -ENOMEM; | |
1393 | ||
1394 | s = hashmap_get(m->units, n); | |
1395 | if (s) { | |
1396 | int q; | |
1397 | ||
1398 | q = swap_set_devnode(s, dn); | |
1399 | if (q < 0) | |
1400 | r = q; | |
1401 | } | |
1402 | } | |
1403 | ||
1404 | return r; | |
1405 | } | |
1406 | ||
1407 | int swap_process_removed_device(Manager *m, struct udev_device *dev) { | |
9670d583 LP |
1408 | const char *dn; |
1409 | int r = 0; | |
1410 | Swap *s; | |
1411 | ||
1412 | dn = udev_device_get_devnode(dev); | |
1413 | if (!dn) | |
1414 | return 0; | |
1415 | ||
1416 | while ((s = hashmap_get(m->swaps_by_devnode, dn))) { | |
1417 | int q; | |
1418 | ||
1419 | q = swap_set_devnode(s, NULL); | |
1420 | if (q < 0) | |
1421 | r = q; | |
1422 | } | |
1423 | ||
1424 | return r; | |
1425 | } | |
1426 | ||
fdf20a31 | 1427 | static void swap_reset_failed(Unit *u) { |
5632e374 LP |
1428 | Swap *s = SWAP(u); |
1429 | ||
1430 | assert(s); | |
1431 | ||
fdf20a31 | 1432 | if (s->state == SWAP_FAILED) |
5632e374 | 1433 | swap_set_state(s, SWAP_DEAD); |
e04aad61 | 1434 | |
e1770af8 | 1435 | s->result = SWAP_SUCCESS; |
5632e374 LP |
1436 | } |
1437 | ||
718db961 | 1438 | static int swap_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) { |
814cc562 | 1439 | return unit_kill_common(u, who, signo, -1, SWAP(u)->control_pid, error); |
8a0867d6 LP |
1440 | } |
1441 | ||
68db7a3b ZJS |
1442 | static int swap_get_timeout(Unit *u, uint64_t *timeout) { |
1443 | Swap *s = SWAP(u); | |
1444 | int r; | |
1445 | ||
1446 | if (!s->timer_event_source) | |
1447 | return 0; | |
1448 | ||
1449 | r = sd_event_source_get_time(s->timer_event_source, timeout); | |
1450 | if (r < 0) | |
1451 | return r; | |
1452 | ||
1453 | return 1; | |
1454 | } | |
1455 | ||
5632e374 LP |
1456 | static const char* const swap_state_table[_SWAP_STATE_MAX] = { |
1457 | [SWAP_DEAD] = "dead", | |
e04aad61 | 1458 | [SWAP_ACTIVATING] = "activating", |
5bcb0f2b | 1459 | [SWAP_ACTIVATING_DONE] = "activating-done", |
5632e374 | 1460 | [SWAP_ACTIVE] = "active", |
e04aad61 LP |
1461 | [SWAP_DEACTIVATING] = "deactivating", |
1462 | [SWAP_ACTIVATING_SIGTERM] = "activating-sigterm", | |
1463 | [SWAP_ACTIVATING_SIGKILL] = "activating-sigkill", | |
1464 | [SWAP_DEACTIVATING_SIGTERM] = "deactivating-sigterm", | |
1465 | [SWAP_DEACTIVATING_SIGKILL] = "deactivating-sigkill", | |
fdf20a31 | 1466 | [SWAP_FAILED] = "failed" |
5632e374 LP |
1467 | }; |
1468 | ||
1469 | DEFINE_STRING_TABLE_LOOKUP(swap_state, SwapState); | |
1470 | ||
e04aad61 LP |
1471 | static const char* const swap_exec_command_table[_SWAP_EXEC_COMMAND_MAX] = { |
1472 | [SWAP_EXEC_ACTIVATE] = "ExecActivate", | |
1473 | [SWAP_EXEC_DEACTIVATE] = "ExecDeactivate", | |
1474 | }; | |
1475 | ||
1476 | DEFINE_STRING_TABLE_LOOKUP(swap_exec_command, SwapExecCommand); | |
1477 | ||
e1770af8 LP |
1478 | static const char* const swap_result_table[_SWAP_RESULT_MAX] = { |
1479 | [SWAP_SUCCESS] = "success", | |
1480 | [SWAP_FAILURE_RESOURCES] = "resources", | |
1481 | [SWAP_FAILURE_TIMEOUT] = "timeout", | |
1482 | [SWAP_FAILURE_EXIT_CODE] = "exit-code", | |
1483 | [SWAP_FAILURE_SIGNAL] = "signal", | |
1484 | [SWAP_FAILURE_CORE_DUMP] = "core-dump" | |
1485 | }; | |
1486 | ||
1487 | DEFINE_STRING_TABLE_LOOKUP(swap_result, SwapResult); | |
1488 | ||
07b0b134 | 1489 | const UnitVTable swap_vtable = { |
7d17cfbc | 1490 | .object_size = sizeof(Swap), |
718db961 LP |
1491 | .exec_context_offset = offsetof(Swap, exec_context), |
1492 | .cgroup_context_offset = offsetof(Swap, cgroup_context), | |
1493 | .kill_context_offset = offsetof(Swap, kill_context), | |
613b411c | 1494 | .exec_runtime_offset = offsetof(Swap, exec_runtime), |
3ef63c31 | 1495 | |
f975e971 LP |
1496 | .sections = |
1497 | "Unit\0" | |
1498 | "Swap\0" | |
1499 | "Install\0", | |
4ad49000 | 1500 | .private_section = "Swap", |
71645aca | 1501 | |
e04aad61 | 1502 | .no_alias = true, |
07b0b134 ML |
1503 | .no_instances = true, |
1504 | ||
4e85aff4 | 1505 | .init = swap_init, |
07b0b134 | 1506 | .load = swap_load, |
6e620bec | 1507 | .done = swap_done, |
07b0b134 ML |
1508 | |
1509 | .coldplug = swap_coldplug, | |
1510 | ||
1511 | .dump = swap_dump, | |
1512 | ||
1513 | .start = swap_start, | |
1514 | .stop = swap_stop, | |
1515 | ||
8a0867d6 LP |
1516 | .kill = swap_kill, |
1517 | ||
68db7a3b ZJS |
1518 | .get_timeout = swap_get_timeout, |
1519 | ||
07b0b134 ML |
1520 | .serialize = swap_serialize, |
1521 | .deserialize_item = swap_deserialize_item, | |
1522 | ||
1523 | .active_state = swap_active_state, | |
1524 | .sub_state_to_string = swap_sub_state_to_string, | |
1525 | ||
1526 | .check_gc = swap_check_gc, | |
1527 | ||
e04aad61 | 1528 | .sigchld_event = swap_sigchld_event, |
e04aad61 LP |
1529 | |
1530 | .reset_failed = swap_reset_failed, | |
1531 | ||
c4e2ceae | 1532 | .bus_interface = "org.freedesktop.systemd1.Swap", |
718db961 | 1533 | .bus_vtable = bus_swap_vtable, |
74c964d3 LP |
1534 | .bus_set_property = bus_swap_set_property, |
1535 | .bus_commit_properties = bus_swap_commit_properties, | |
07b0b134 | 1536 | |
e04aad61 | 1537 | .following = swap_following, |
6210e7fc | 1538 | .following_set = swap_following_set, |
5632e374 | 1539 | |
6e620bec | 1540 | .enumerate = swap_enumerate, |
c6918296 MS |
1541 | .shutdown = swap_shutdown, |
1542 | ||
1543 | .status_message_formats = { | |
1544 | .starting_stopping = { | |
1545 | [0] = "Activating swap %s...", | |
1546 | [1] = "Deactivating swap %s...", | |
1547 | }, | |
1548 | .finished_start_job = { | |
1549 | [JOB_DONE] = "Activated swap %s.", | |
1550 | [JOB_FAILED] = "Failed to activate swap %s.", | |
1551 | [JOB_DEPENDENCY] = "Dependency failed for %s.", | |
1552 | [JOB_TIMEOUT] = "Timed out activating swap %s.", | |
1553 | }, | |
1554 | .finished_stop_job = { | |
1555 | [JOB_DONE] = "Deactivated swap %s.", | |
1556 | [JOB_FAILED] = "Failed deactivating swap %s.", | |
1557 | [JOB_TIMEOUT] = "Timed out deactivating swap %s.", | |
1558 | }, | |
1559 | }, | |
07b0b134 | 1560 | }; |