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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> | |
07b0b134 | 23 | #include <unistd.h> |
07b0b134 ML |
24 | #include <sys/epoll.h> |
25 | #include <sys/stat.h> | |
e04aad61 | 26 | #include <libudev.h> |
07b0b134 ML |
27 | |
28 | #include "unit.h" | |
29 | #include "swap.h" | |
07b0b134 ML |
30 | #include "unit-name.h" |
31 | #include "dbus-swap.h" | |
514f4ef5 | 32 | #include "special.h" |
9a57c629 | 33 | #include "exit-status.h" |
9eb977db | 34 | #include "path-util.h" |
a5c3034f | 35 | #include "virt.h" |
5bcb0f2b | 36 | #include "udev-util.h" |
d15d0333 | 37 | #include "fstab-util.h" |
6482f626 | 38 | #include "formats-util.h" |
07b0b134 ML |
39 | |
40 | static const UnitActiveState state_translation_table[_SWAP_STATE_MAX] = { | |
41 | [SWAP_DEAD] = UNIT_INACTIVE, | |
e04aad61 | 42 | [SWAP_ACTIVATING] = UNIT_ACTIVATING, |
5bcb0f2b | 43 | [SWAP_ACTIVATING_DONE] = UNIT_ACTIVE, |
07b0b134 | 44 | [SWAP_ACTIVE] = UNIT_ACTIVE, |
e04aad61 LP |
45 | [SWAP_DEACTIVATING] = UNIT_DEACTIVATING, |
46 | [SWAP_ACTIVATING_SIGTERM] = UNIT_DEACTIVATING, | |
47 | [SWAP_ACTIVATING_SIGKILL] = UNIT_DEACTIVATING, | |
48 | [SWAP_DEACTIVATING_SIGTERM] = UNIT_DEACTIVATING, | |
49 | [SWAP_DEACTIVATING_SIGKILL] = UNIT_DEACTIVATING, | |
fdf20a31 | 50 | [SWAP_FAILED] = UNIT_FAILED |
07b0b134 ML |
51 | }; |
52 | ||
718db961 LP |
53 | static int swap_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata); |
54 | static int swap_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata); | |
55 | ||
e04aad61 | 56 | static void swap_unset_proc_swaps(Swap *s) { |
9670d583 LP |
57 | assert(s); |
58 | ||
59 | if (!s->from_proc_swaps) | |
60 | return; | |
61 | ||
a1e58e8e | 62 | s->parameters_proc_swaps.what = mfree(s->parameters_proc_swaps.what); |
9670d583 LP |
63 | |
64 | s->from_proc_swaps = false; | |
65 | } | |
66 | ||
67 | static int swap_set_devnode(Swap *s, const char *devnode) { | |
df326b84 | 68 | Hashmap *swaps; |
5bcb0f2b | 69 | Swap *first; |
9670d583 | 70 | int r; |
e04aad61 LP |
71 | |
72 | assert(s); | |
73 | ||
d5099efc | 74 | r = hashmap_ensure_allocated(&UNIT(s)->manager->swaps_by_devnode, &string_hash_ops); |
9670d583 LP |
75 | if (r < 0) |
76 | return r; | |
e04aad61 | 77 | |
9670d583 | 78 | swaps = UNIT(s)->manager->swaps_by_devnode; |
e04aad61 | 79 | |
9670d583 LP |
80 | if (s->devnode) { |
81 | first = hashmap_get(swaps, s->devnode); | |
e04aad61 | 82 | |
9670d583 LP |
83 | LIST_REMOVE(same_devnode, first, s); |
84 | if (first) | |
85 | hashmap_replace(swaps, first->devnode, first); | |
86 | else | |
87 | hashmap_remove(swaps, s->devnode); | |
5bcb0f2b | 88 | |
a1e58e8e | 89 | s->devnode = mfree(s->devnode); |
9670d583 LP |
90 | } |
91 | ||
92 | if (devnode) { | |
93 | s->devnode = strdup(devnode); | |
94 | if (!s->devnode) | |
95 | return -ENOMEM; | |
96 | ||
97 | first = hashmap_get(swaps, s->devnode); | |
98 | LIST_PREPEND(same_devnode, first, s); | |
99 | ||
100 | return hashmap_replace(swaps, first->devnode, first); | |
101 | } | |
102 | ||
103 | return 0; | |
e04aad61 LP |
104 | } |
105 | ||
f6cebb3b | 106 | static void swap_init(Unit *u) { |
6e620bec LP |
107 | Swap *s = SWAP(u); |
108 | ||
109 | assert(s); | |
1124fe6f | 110 | assert(UNIT(s)->load_state == UNIT_STUB); |
6e620bec | 111 | |
1f19a534 | 112 | s->timeout_usec = u->manager->default_timeout_start_usec; |
e04aad61 | 113 | |
ac155bb8 MS |
114 | s->exec_context.std_output = u->manager->default_std_output; |
115 | s->exec_context.std_error = u->manager->default_std_error; | |
085afe36 | 116 | |
6b1dc2bd | 117 | s->parameters_proc_swaps.priority = s->parameters_fragment.priority = -1; |
e04aad61 | 118 | |
e1770af8 | 119 | s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; |
c8f4d764 | 120 | |
5bcb0f2b | 121 | u->ignore_on_isolate = true; |
e04aad61 LP |
122 | } |
123 | ||
124 | static void swap_unwatch_control_pid(Swap *s) { | |
125 | assert(s); | |
126 | ||
127 | if (s->control_pid <= 0) | |
128 | return; | |
129 | ||
130 | unit_unwatch_pid(UNIT(s), s->control_pid); | |
131 | s->control_pid = 0; | |
6e620bec LP |
132 | } |
133 | ||
4e85aff4 LP |
134 | static void swap_done(Unit *u) { |
135 | Swap *s = SWAP(u); | |
07b0b134 | 136 | |
4e85aff4 | 137 | assert(s); |
07b0b134 | 138 | |
e04aad61 | 139 | swap_unset_proc_swaps(s); |
9670d583 | 140 | swap_set_devnode(s, NULL); |
e04aad61 | 141 | |
a1e58e8e LP |
142 | s->what = mfree(s->what); |
143 | s->parameters_fragment.what = mfree(s->parameters_fragment.what); | |
144 | s->parameters_fragment.options = mfree(s->parameters_fragment.options); | |
86b23b07 | 145 | |
613b411c | 146 | s->exec_runtime = exec_runtime_unref(s->exec_runtime); |
e04aad61 LP |
147 | exec_command_done_array(s->exec_command, _SWAP_EXEC_COMMAND_MAX); |
148 | s->control_command = NULL; | |
149 | ||
150 | swap_unwatch_control_pid(s); | |
151 | ||
718db961 LP |
152 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
153 | } | |
154 | ||
155 | static int swap_arm_timer(Swap *s) { | |
156 | int r; | |
157 | ||
158 | assert(s); | |
159 | ||
160 | if (s->timeout_usec <= 0) { | |
161 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); | |
162 | return 0; | |
163 | } | |
164 | ||
165 | if (s->timer_event_source) { | |
166 | r = sd_event_source_set_time(s->timer_event_source, now(CLOCK_MONOTONIC) + s->timeout_usec); | |
167 | if (r < 0) | |
168 | return r; | |
169 | ||
170 | return sd_event_source_set_enabled(s->timer_event_source, SD_EVENT_ONESHOT); | |
171 | } | |
172 | ||
7dfbe2e3 | 173 | r = sd_event_add_time( |
6a0f1f6d LP |
174 | UNIT(s)->manager->event, |
175 | &s->timer_event_source, | |
176 | CLOCK_MONOTONIC, | |
177 | now(CLOCK_MONOTONIC) + s->timeout_usec, 0, | |
178 | swap_dispatch_timer, s); | |
7dfbe2e3 TG |
179 | if (r < 0) |
180 | return r; | |
181 | ||
182 | (void) sd_event_source_set_description(s->timer_event_source, "swap-timer"); | |
183 | ||
184 | return 0; | |
07b0b134 ML |
185 | } |
186 | ||
173a8d04 | 187 | static int swap_add_device_links(Swap *s) { |
173a8d04 LP |
188 | assert(s); |
189 | ||
190 | if (!s->what) | |
191 | return 0; | |
192 | ||
f10af76d LP |
193 | if (!s->from_fragment) |
194 | return 0; | |
195 | ||
cfcfd4ae | 196 | if (is_device_path(s->what)) |
b2c23da8 | 197 | return unit_add_node_link(UNIT(s), s->what, UNIT(s)->manager->running_as == MANAGER_SYSTEM); |
cfcfd4ae LP |
198 | else |
199 | /* File based swap devices need to be ordered after | |
2b93b027 | 200 | * systemd-remount-fs.service, since they might need a |
cfcfd4ae | 201 | * writable file system. */ |
2b93b027 | 202 | return unit_add_dependency_by_name(UNIT(s), UNIT_AFTER, SPECIAL_REMOUNT_FS_SERVICE, NULL, true); |
173a8d04 LP |
203 | } |
204 | ||
2edd4434 | 205 | static int swap_add_default_dependencies(Swap *s) { |
2edd4434 LP |
206 | assert(s); |
207 | ||
b2c23da8 | 208 | if (UNIT(s)->manager->running_as != MANAGER_SYSTEM) |
6b1dc2bd | 209 | return 0; |
2edd4434 | 210 | |
75f86906 | 211 | if (detect_container() > 0) |
c0387ebf LP |
212 | return 0; |
213 | ||
5607d856 | 214 | return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true); |
2edd4434 LP |
215 | } |
216 | ||
4e85aff4 | 217 | static int swap_verify(Swap *s) { |
7fd1b19b | 218 | _cleanup_free_ char *e = NULL; |
7410616c | 219 | int r; |
4e85aff4 | 220 | |
1124fe6f | 221 | if (UNIT(s)->load_state != UNIT_LOADED) |
5bcb0f2b | 222 | return 0; |
4e85aff4 | 223 | |
7410616c LP |
224 | r = unit_name_from_path(s->what, ".swap", &e); |
225 | if (r < 0) | |
f2341e0a | 226 | return log_unit_error_errno(UNIT(s), r, "Failed to generate unit name from path: %m"); |
4e85aff4 | 227 | |
7410616c | 228 | if (!unit_has_name(UNIT(s), e)) { |
f2341e0a | 229 | log_unit_error(UNIT(s), "Value of What= and unit name do not match, not loading."); |
4e85aff4 LP |
230 | return -EINVAL; |
231 | } | |
232 | ||
4819ff03 | 233 | if (s->exec_context.pam_name && s->kill_context.kill_mode != KILL_CONTROL_GROUP) { |
f2341e0a | 234 | log_unit_error(UNIT(s), "Unit has PAM enabled. Kill mode must be set to 'control-group'. Refusing to load."); |
e04aad61 LP |
235 | return -EINVAL; |
236 | } | |
237 | ||
4e85aff4 LP |
238 | return 0; |
239 | } | |
240 | ||
9670d583 LP |
241 | static int swap_load_devnode(Swap *s) { |
242 | _cleanup_udev_device_unref_ struct udev_device *d = NULL; | |
243 | struct stat st; | |
244 | const char *p; | |
245 | ||
246 | assert(s); | |
247 | ||
248 | if (stat(s->what, &st) < 0 || !S_ISBLK(st.st_mode)) | |
249 | return 0; | |
250 | ||
251 | d = udev_device_new_from_devnum(UNIT(s)->manager->udev, 'b', st.st_rdev); | |
252 | if (!d) | |
253 | return 0; | |
254 | ||
255 | p = udev_device_get_devnode(d); | |
256 | if (!p) | |
257 | return 0; | |
258 | ||
259 | return swap_set_devnode(s, p); | |
260 | } | |
261 | ||
07b0b134 ML |
262 | static int swap_load(Unit *u) { |
263 | int r; | |
264 | Swap *s = SWAP(u); | |
265 | ||
266 | assert(s); | |
ac155bb8 | 267 | assert(u->load_state == UNIT_STUB); |
07b0b134 ML |
268 | |
269 | /* Load a .swap file */ | |
646134dc ZJS |
270 | r = unit_load_fragment_and_dropin_optional(u); |
271 | if (r < 0) | |
07b0b134 ML |
272 | return r; |
273 | ||
ac155bb8 | 274 | if (u->load_state == UNIT_LOADED) { |
4e85aff4 | 275 | |
1124fe6f | 276 | if (UNIT(s)->fragment_path) |
4e85aff4 LP |
277 | s->from_fragment = true; |
278 | ||
279 | if (!s->what) { | |
280 | if (s->parameters_fragment.what) | |
281 | s->what = strdup(s->parameters_fragment.what); | |
4e85aff4 LP |
282 | else if (s->parameters_proc_swaps.what) |
283 | s->what = strdup(s->parameters_proc_swaps.what); | |
7410616c LP |
284 | else { |
285 | r = unit_name_to_path(u->id, &s->what); | |
286 | if (r < 0) | |
287 | return r; | |
288 | } | |
4e85aff4 LP |
289 | |
290 | if (!s->what) | |
07b0b134 | 291 | return -ENOMEM; |
4e85aff4 | 292 | } |
07b0b134 ML |
293 | |
294 | path_kill_slashes(s->what); | |
295 | ||
5bcb0f2b LP |
296 | if (!UNIT(s)->description) { |
297 | r = unit_set_description(u, s->what); | |
298 | if (r < 0) | |
4e85aff4 | 299 | return r; |
5bcb0f2b | 300 | } |
4e85aff4 | 301 | |
a57f7e2c | 302 | r = unit_require_mounts_for(UNIT(s), s->what); |
646134dc | 303 | if (r < 0) |
07b0b134 ML |
304 | return r; |
305 | ||
a57f7e2c | 306 | r = swap_add_device_links(s); |
646134dc | 307 | if (r < 0) |
6e2ef85b | 308 | return r; |
07b0b134 | 309 | |
9670d583 LP |
310 | r = swap_load_devnode(s); |
311 | if (r < 0) | |
312 | return r; | |
313 | ||
598459ce LP |
314 | r = unit_patch_contexts(u); |
315 | if (r < 0) | |
316 | return r; | |
317 | ||
318 | r = unit_add_exec_dependencies(u, &s->exec_context); | |
319 | if (r < 0) | |
320 | return r; | |
321 | ||
d79200e2 | 322 | r = unit_set_default_slice(u); |
a016b922 LP |
323 | if (r < 0) |
324 | return r; | |
325 | ||
646134dc ZJS |
326 | if (UNIT(s)->default_dependencies) { |
327 | r = swap_add_default_dependencies(s); | |
328 | if (r < 0) | |
2edd4434 | 329 | return r; |
646134dc | 330 | } |
07b0b134 ML |
331 | } |
332 | ||
333 | return swap_verify(s); | |
334 | } | |
335 | ||
628c89cc | 336 | static int swap_setup_unit( |
4e85aff4 LP |
337 | Manager *m, |
338 | const char *what, | |
e04aad61 | 339 | const char *what_proc_swaps, |
4e85aff4 | 340 | int priority, |
e04aad61 LP |
341 | bool set_flags) { |
342 | ||
7fd1b19b | 343 | _cleanup_free_ char *e = NULL; |
2c7c6144 | 344 | bool delete = false; |
5bcb0f2b | 345 | Unit *u = NULL; |
07b0b134 | 346 | int r; |
4e85aff4 LP |
347 | SwapParameters *p; |
348 | ||
349 | assert(m); | |
350 | assert(what); | |
6b1dc2bd | 351 | assert(what_proc_swaps); |
07b0b134 | 352 | |
7410616c LP |
353 | r = unit_name_from_path(what, ".swap", &e); |
354 | if (r < 0) | |
f2341e0a | 355 | return log_unit_error_errno(u, r, "Failed to generate unit name from path: %m"); |
07b0b134 | 356 | |
e04aad61 LP |
357 | u = manager_get_unit(m, e); |
358 | ||
6b1dc2bd | 359 | if (u && |
e04aad61 | 360 | SWAP(u)->from_proc_swaps && |
628c89cc LP |
361 | !path_equal(SWAP(u)->parameters_proc_swaps.what, what_proc_swaps)) { |
362 | log_error("Swap %s appeared twice with different device paths %s and %s", e, SWAP(u)->parameters_proc_swaps.what, what_proc_swaps); | |
e04aad61 | 363 | return -EEXIST; |
628c89cc | 364 | } |
4e85aff4 LP |
365 | |
366 | if (!u) { | |
07b0b134 ML |
367 | delete = true; |
368 | ||
7d17cfbc | 369 | u = unit_new(m, sizeof(Swap)); |
170ca19e ZJS |
370 | if (!u) |
371 | return log_oom(); | |
e04aad61 | 372 | |
7d17cfbc MS |
373 | r = unit_add_name(u, e); |
374 | if (r < 0) | |
e04aad61 LP |
375 | goto fail; |
376 | ||
7d17cfbc MS |
377 | SWAP(u)->what = strdup(what); |
378 | if (!SWAP(u)->what) { | |
628c89cc | 379 | r = -ENOMEM; |
e04aad61 LP |
380 | goto fail; |
381 | } | |
382 | ||
383 | unit_add_to_load_queue(u); | |
4e85aff4 LP |
384 | } else |
385 | delete = false; | |
07b0b134 | 386 | |
6b1dc2bd | 387 | p = &SWAP(u)->parameters_proc_swaps; |
07b0b134 | 388 | |
6b1dc2bd | 389 | if (!p->what) { |
5bcb0f2b LP |
390 | p->what = strdup(what_proc_swaps); |
391 | if (!p->what) { | |
392 | r = -ENOMEM; | |
6b1dc2bd LP |
393 | goto fail; |
394 | } | |
6b1dc2bd | 395 | } |
e04aad61 | 396 | |
6b1dc2bd LP |
397 | if (set_flags) { |
398 | SWAP(u)->is_active = true; | |
399 | SWAP(u)->just_activated = !SWAP(u)->from_proc_swaps; | |
4e85aff4 | 400 | } |
07b0b134 | 401 | |
6b1dc2bd LP |
402 | SWAP(u)->from_proc_swaps = true; |
403 | ||
4e85aff4 | 404 | p->priority = priority; |
07b0b134 | 405 | |
4e85aff4 | 406 | unit_add_to_dbus_queue(u); |
07b0b134 ML |
407 | return 0; |
408 | ||
409 | fail: | |
f2341e0a | 410 | log_unit_warning_errno(u, r, "Failed to load swap unit: %m"); |
e04aad61 | 411 | |
4e85aff4 | 412 | if (delete && u) |
07b0b134 ML |
413 | unit_free(u); |
414 | ||
4e85aff4 | 415 | return r; |
07b0b134 ML |
416 | } |
417 | ||
628c89cc | 418 | static int swap_process_new(Manager *m, const char *device, int prio, bool set_flags) { |
5bcb0f2b LP |
419 | _cleanup_udev_device_unref_ struct udev_device *d = NULL; |
420 | struct udev_list_entry *item = NULL, *first = NULL; | |
421 | const char *dn; | |
e04aad61 | 422 | struct stat st; |
5bcb0f2b | 423 | int r; |
e04aad61 LP |
424 | |
425 | assert(m); | |
426 | ||
628c89cc | 427 | r = swap_setup_unit(m, device, device, prio, set_flags); |
5bcb0f2b LP |
428 | if (r < 0) |
429 | return r; | |
e04aad61 | 430 | |
5bcb0f2b LP |
431 | /* If this is a block device, then let's add duplicates for |
432 | * all other names of this block device */ | |
433 | if (stat(device, &st) < 0 || !S_ISBLK(st.st_mode)) | |
434 | return 0; | |
e04aad61 | 435 | |
5bcb0f2b LP |
436 | d = udev_device_new_from_devnum(m->udev, 'b', st.st_rdev); |
437 | if (!d) | |
438 | return 0; | |
e04aad61 | 439 | |
5bcb0f2b LP |
440 | /* Add the main device node */ |
441 | dn = udev_device_get_devnode(d); | |
442 | if (dn && !streq(dn, device)) | |
628c89cc | 443 | swap_setup_unit(m, dn, device, prio, set_flags); |
e04aad61 | 444 | |
5bcb0f2b LP |
445 | /* Add additional units for all symlinks */ |
446 | first = udev_device_get_devlinks_list_entry(d); | |
447 | udev_list_entry_foreach(item, first) { | |
448 | const char *p; | |
e04aad61 | 449 | |
5bcb0f2b LP |
450 | /* Don't bother with the /dev/block links */ |
451 | p = udev_list_entry_get_name(item); | |
e04aad61 | 452 | |
5bcb0f2b LP |
453 | if (streq(p, device)) |
454 | continue; | |
e04aad61 | 455 | |
5bcb0f2b LP |
456 | if (path_startswith(p, "/dev/block/")) |
457 | continue; | |
e04aad61 | 458 | |
5bcb0f2b LP |
459 | if (stat(p, &st) >= 0) |
460 | if (!S_ISBLK(st.st_mode) || | |
461 | st.st_rdev != udev_device_get_devnum(d)) | |
462 | continue; | |
e04aad61 | 463 | |
628c89cc | 464 | swap_setup_unit(m, p, device, prio, set_flags); |
e04aad61 LP |
465 | } |
466 | ||
e04aad61 LP |
467 | return r; |
468 | } | |
469 | ||
07b0b134 ML |
470 | static void swap_set_state(Swap *s, SwapState state) { |
471 | SwapState old_state; | |
37cf8fee | 472 | Swap *other; |
e04aad61 | 473 | |
07b0b134 ML |
474 | assert(s); |
475 | ||
476 | old_state = s->state; | |
477 | s->state = state; | |
478 | ||
e04aad61 LP |
479 | if (state != SWAP_ACTIVATING && |
480 | state != SWAP_ACTIVATING_SIGTERM && | |
481 | state != SWAP_ACTIVATING_SIGKILL && | |
5bcb0f2b | 482 | state != SWAP_ACTIVATING_DONE && |
e04aad61 LP |
483 | state != SWAP_DEACTIVATING && |
484 | state != SWAP_DEACTIVATING_SIGTERM && | |
485 | state != SWAP_DEACTIVATING_SIGKILL) { | |
718db961 | 486 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
e04aad61 LP |
487 | swap_unwatch_control_pid(s); |
488 | s->control_command = NULL; | |
489 | s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; | |
490 | } | |
491 | ||
07b0b134 | 492 | if (state != old_state) |
f2341e0a | 493 | log_unit_debug(UNIT(s), "Changed %s -> %s", swap_state_to_string(old_state), swap_state_to_string(state)); |
07b0b134 | 494 | |
5bcb0f2b | 495 | unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], true); |
37cf8fee LP |
496 | |
497 | /* If there other units for the same device node have a job | |
498 | queued it might be worth checking again if it is runnable | |
499 | now. This is necessary, since swap_start() refuses | |
500 | operation with EAGAIN if there's already another job for | |
501 | the same device node queued. */ | |
502 | LIST_FOREACH_OTHERS(same_devnode, other, s) | |
503 | if (UNIT(other)->job) | |
504 | job_add_to_run_queue(UNIT(other)->job); | |
07b0b134 ML |
505 | } |
506 | ||
be847e82 | 507 | static int swap_coldplug(Unit *u) { |
07b0b134 ML |
508 | Swap *s = SWAP(u); |
509 | SwapState new_state = SWAP_DEAD; | |
e04aad61 | 510 | int r; |
07b0b134 ML |
511 | |
512 | assert(s); | |
513 | assert(s->state == SWAP_DEAD); | |
514 | ||
515 | if (s->deserialized_state != s->state) | |
516 | new_state = s->deserialized_state; | |
4e85aff4 | 517 | else if (s->from_proc_swaps) |
07b0b134 ML |
518 | new_state = SWAP_ACTIVE; |
519 | ||
5bcb0f2b LP |
520 | if (new_state == s->state) |
521 | return 0; | |
e04aad61 | 522 | |
5bcb0f2b LP |
523 | if (new_state == SWAP_ACTIVATING || |
524 | new_state == SWAP_ACTIVATING_SIGTERM || | |
525 | new_state == SWAP_ACTIVATING_SIGKILL || | |
526 | new_state == SWAP_ACTIVATING_DONE || | |
527 | new_state == SWAP_DEACTIVATING || | |
528 | new_state == SWAP_DEACTIVATING_SIGTERM || | |
529 | new_state == SWAP_DEACTIVATING_SIGKILL) { | |
e04aad61 | 530 | |
5bcb0f2b LP |
531 | if (s->control_pid <= 0) |
532 | return -EBADMSG; | |
e04aad61 | 533 | |
5bcb0f2b LP |
534 | r = unit_watch_pid(UNIT(s), s->control_pid); |
535 | if (r < 0) | |
536 | return r; | |
e04aad61 | 537 | |
5bcb0f2b LP |
538 | r = swap_arm_timer(s); |
539 | if (r < 0) | |
540 | return r; | |
e04aad61 | 541 | } |
07b0b134 | 542 | |
5bcb0f2b | 543 | swap_set_state(s, new_state); |
07b0b134 ML |
544 | return 0; |
545 | } | |
546 | ||
547 | static void swap_dump(Unit *u, FILE *f, const char *prefix) { | |
548 | Swap *s = SWAP(u); | |
4e85aff4 | 549 | SwapParameters *p; |
07b0b134 ML |
550 | |
551 | assert(s); | |
4e85aff4 LP |
552 | assert(f); |
553 | ||
554 | if (s->from_proc_swaps) | |
555 | p = &s->parameters_proc_swaps; | |
556 | else if (s->from_fragment) | |
557 | p = &s->parameters_fragment; | |
b6bfc7bb LP |
558 | else |
559 | p = NULL; | |
07b0b134 ML |
560 | |
561 | fprintf(f, | |
4e85aff4 | 562 | "%sSwap State: %s\n" |
e1770af8 | 563 | "%sResult: %s\n" |
07b0b134 | 564 | "%sWhat: %s\n" |
4e85aff4 LP |
565 | "%sFrom /proc/swaps: %s\n" |
566 | "%sFrom fragment: %s\n", | |
07b0b134 | 567 | prefix, swap_state_to_string(s->state), |
e1770af8 | 568 | prefix, swap_result_to_string(s->result), |
07b0b134 | 569 | prefix, s->what, |
4e85aff4 LP |
570 | prefix, yes_no(s->from_proc_swaps), |
571 | prefix, yes_no(s->from_fragment)); | |
e04aad61 | 572 | |
9670d583 LP |
573 | if (s->devnode) |
574 | fprintf(f, "%sDevice Node: %s\n", prefix, s->devnode); | |
575 | ||
b6bfc7bb LP |
576 | if (p) |
577 | fprintf(f, | |
578 | "%sPriority: %i\n" | |
47cb901e | 579 | "%sOptions: %s\n", |
b6bfc7bb | 580 | prefix, p->priority, |
47cb901e | 581 | prefix, strempty(p->options)); |
b6bfc7bb | 582 | |
e04aad61 LP |
583 | if (s->control_pid > 0) |
584 | fprintf(f, | |
de0671ee ZJS |
585 | "%sControl PID: "PID_FMT"\n", |
586 | prefix, s->control_pid); | |
e04aad61 LP |
587 | |
588 | exec_context_dump(&s->exec_context, f, prefix); | |
4819ff03 | 589 | kill_context_dump(&s->kill_context, f, prefix); |
e04aad61 LP |
590 | } |
591 | ||
592 | static int swap_spawn(Swap *s, ExecCommand *c, pid_t *_pid) { | |
593 | pid_t pid; | |
594 | int r; | |
9fa95f85 DM |
595 | ExecParameters exec_params = { |
596 | .apply_permissions = true, | |
597 | .apply_chroot = true, | |
598 | .apply_tty_stdin = true, | |
6f856a09 | 599 | .bus_endpoint_fd = -1, |
9fa95f85 | 600 | }; |
e04aad61 LP |
601 | |
602 | assert(s); | |
603 | assert(c); | |
604 | assert(_pid); | |
605 | ||
5ad096b3 LP |
606 | (void) unit_realize_cgroup(UNIT(s)); |
607 | if (s->reset_cpu_usage) { | |
608 | (void) unit_reset_cpu_usage(UNIT(s)); | |
609 | s->reset_cpu_usage = false; | |
610 | } | |
4ad49000 | 611 | |
613b411c LP |
612 | r = unit_setup_exec_runtime(UNIT(s)); |
613 | if (r < 0) | |
614 | goto fail; | |
615 | ||
718db961 | 616 | r = swap_arm_timer(s); |
646134dc | 617 | if (r < 0) |
e04aad61 LP |
618 | goto fail; |
619 | ||
9fa95f85 DM |
620 | exec_params.environment = UNIT(s)->manager->environment; |
621 | exec_params.confirm_spawn = UNIT(s)->manager->confirm_spawn; | |
622 | exec_params.cgroup_supported = UNIT(s)->manager->cgroup_supported; | |
623 | exec_params.cgroup_path = UNIT(s)->cgroup_path; | |
a931ad47 | 624 | exec_params.cgroup_delegate = s->cgroup_context.delegate; |
9fa95f85 | 625 | exec_params.runtime_prefix = manager_get_runtime_prefix(UNIT(s)->manager); |
9fa95f85 | 626 | |
f2341e0a LP |
627 | r = exec_spawn(UNIT(s), |
628 | c, | |
646134dc | 629 | &s->exec_context, |
9fa95f85 | 630 | &exec_params, |
613b411c | 631 | s->exec_runtime, |
646134dc ZJS |
632 | &pid); |
633 | if (r < 0) | |
e04aad61 LP |
634 | goto fail; |
635 | ||
646134dc ZJS |
636 | r = unit_watch_pid(UNIT(s), pid); |
637 | if (r < 0) | |
e04aad61 LP |
638 | /* FIXME: we need to do something here */ |
639 | goto fail; | |
640 | ||
641 | *_pid = pid; | |
642 | ||
643 | return 0; | |
644 | ||
645 | fail: | |
718db961 | 646 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
e04aad61 | 647 | return r; |
07b0b134 ML |
648 | } |
649 | ||
e1770af8 | 650 | static void swap_enter_dead(Swap *s, SwapResult f) { |
07b0b134 ML |
651 | assert(s); |
652 | ||
e1770af8 LP |
653 | if (f != SWAP_SUCCESS) |
654 | s->result = f; | |
e04aad61 | 655 | |
613b411c LP |
656 | exec_runtime_destroy(s->exec_runtime); |
657 | s->exec_runtime = exec_runtime_unref(s->exec_runtime); | |
658 | ||
e66cf1a3 LP |
659 | exec_context_destroy_runtime_directory(&s->exec_context, manager_get_runtime_prefix(UNIT(s)->manager)); |
660 | ||
e1770af8 | 661 | swap_set_state(s, s->result != SWAP_SUCCESS ? SWAP_FAILED : SWAP_DEAD); |
07b0b134 ML |
662 | } |
663 | ||
e1770af8 | 664 | static void swap_enter_active(Swap *s, SwapResult f) { |
e04aad61 LP |
665 | assert(s); |
666 | ||
e1770af8 LP |
667 | if (f != SWAP_SUCCESS) |
668 | s->result = f; | |
e04aad61 LP |
669 | |
670 | swap_set_state(s, SWAP_ACTIVE); | |
671 | } | |
672 | ||
e1770af8 | 673 | static void swap_enter_signal(Swap *s, SwapState state, SwapResult f) { |
07b0b134 ML |
674 | int r; |
675 | ||
676 | assert(s); | |
e04aad61 | 677 | |
e1770af8 LP |
678 | if (f != SWAP_SUCCESS) |
679 | s->result = f; | |
e04aad61 | 680 | |
cd2086fe LP |
681 | r = unit_kill_context( |
682 | UNIT(s), | |
683 | &s->kill_context, | |
db2cb23b UTL |
684 | (state != SWAP_ACTIVATING_SIGTERM && state != SWAP_DEACTIVATING_SIGTERM) ? |
685 | KILL_KILL : KILL_TERMINATE, | |
cd2086fe LP |
686 | -1, |
687 | s->control_pid, | |
688 | false); | |
689 | if (r < 0) | |
690 | goto fail; | |
e04aad61 | 691 | |
cd2086fe | 692 | if (r > 0) { |
718db961 | 693 | r = swap_arm_timer(s); |
646134dc | 694 | if (r < 0) |
e04aad61 LP |
695 | goto fail; |
696 | ||
697 | swap_set_state(s, state); | |
ac84d1fb LP |
698 | } else if (state == SWAP_ACTIVATING_SIGTERM) |
699 | swap_enter_signal(s, SWAP_ACTIVATING_SIGKILL, SWAP_SUCCESS); | |
700 | else if (state == SWAP_DEACTIVATING_SIGTERM) | |
701 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, SWAP_SUCCESS); | |
702 | else | |
e1770af8 | 703 | swap_enter_dead(s, SWAP_SUCCESS); |
e04aad61 LP |
704 | |
705 | return; | |
706 | ||
707 | fail: | |
f2341e0a | 708 | log_unit_warning_errno(UNIT(s), r, "Failed to kill processes: %m"); |
e1770af8 | 709 | swap_enter_dead(s, SWAP_FAILURE_RESOURCES); |
e04aad61 LP |
710 | } |
711 | ||
712 | static void swap_enter_activating(Swap *s) { | |
bf1d7ba7 KZ |
713 | _cleanup_free_ char *opts = NULL; |
714 | int r; | |
e04aad61 LP |
715 | |
716 | assert(s); | |
717 | ||
718 | s->control_command_id = SWAP_EXEC_ACTIVATE; | |
719 | s->control_command = s->exec_command + SWAP_EXEC_ACTIVATE; | |
07b0b134 | 720 | |
86b23b07 | 721 | if (s->from_fragment) { |
bf1d7ba7 | 722 | int priority = -1; |
47cb901e | 723 | |
bf1d7ba7 KZ |
724 | r = fstab_find_pri(s->parameters_fragment.options, &priority); |
725 | if (r < 0) | |
726 | log_warning_errno(r, "Failed to parse swap priority \"%s\", ignoring: %m", s->parameters_fragment.options); | |
727 | else if (r == 1 && s->parameters_fragment.priority >= 0) | |
728 | log_warning("Duplicate swap priority configuration by Priority and Options fields."); | |
729 | ||
730 | if (r <= 0 && s->parameters_fragment.priority >= 0) { | |
731 | if (s->parameters_fragment.options) | |
732 | r = asprintf(&opts, "%s,pri=%i", s->parameters_fragment.options, s->parameters_fragment.priority); | |
733 | else | |
734 | r = asprintf(&opts, "pri=%i", s->parameters_fragment.priority); | |
e64d5235 | 735 | if (r < 0) |
bf1d7ba7 | 736 | goto fail; |
e64d5235 | 737 | } |
86b23b07 JS |
738 | } |
739 | ||
740 | r = exec_command_set(s->control_command, "/sbin/swapon", NULL); | |
741 | if (r < 0) | |
742 | goto fail; | |
4e85aff4 | 743 | |
bf1d7ba7 KZ |
744 | if (s->parameters_fragment.options || opts) { |
745 | r = exec_command_append(s->control_command, "-o", | |
746 | opts ? : s->parameters_fragment.options, NULL); | |
86b23b07 JS |
747 | if (r < 0) |
748 | goto fail; | |
749 | } | |
e04aad61 | 750 | |
86b23b07 | 751 | r = exec_command_append(s->control_command, s->what, NULL); |
e04aad61 LP |
752 | if (r < 0) |
753 | goto fail; | |
754 | ||
755 | swap_unwatch_control_pid(s); | |
756 | ||
646134dc ZJS |
757 | r = swap_spawn(s, s->control_command, &s->control_pid); |
758 | if (r < 0) | |
e04aad61 LP |
759 | goto fail; |
760 | ||
761 | swap_set_state(s, SWAP_ACTIVATING); | |
762 | ||
763 | return; | |
764 | ||
765 | fail: | |
f2341e0a | 766 | log_unit_warning_errno(UNIT(s), r, "Failed to run 'swapon' task: %m"); |
e1770af8 | 767 | swap_enter_dead(s, SWAP_FAILURE_RESOURCES); |
e04aad61 LP |
768 | } |
769 | ||
e1770af8 | 770 | static void swap_enter_deactivating(Swap *s) { |
e04aad61 LP |
771 | int r; |
772 | ||
773 | assert(s); | |
774 | ||
e04aad61 LP |
775 | s->control_command_id = SWAP_EXEC_DEACTIVATE; |
776 | s->control_command = s->exec_command + SWAP_EXEC_DEACTIVATE; | |
777 | ||
646134dc | 778 | r = exec_command_set(s->control_command, |
e04aad61 LP |
779 | "/sbin/swapoff", |
780 | s->what, | |
646134dc ZJS |
781 | NULL); |
782 | if (r < 0) | |
e04aad61 LP |
783 | goto fail; |
784 | ||
785 | swap_unwatch_control_pid(s); | |
786 | ||
646134dc ZJS |
787 | r = swap_spawn(s, s->control_command, &s->control_pid); |
788 | if (r < 0) | |
e04aad61 LP |
789 | goto fail; |
790 | ||
791 | swap_set_state(s, SWAP_DEACTIVATING); | |
792 | ||
793 | return; | |
794 | ||
795 | fail: | |
f2341e0a | 796 | log_unit_warning_errno(UNIT(s), r, "Failed to run 'swapoff' task: %m"); |
e1770af8 | 797 | swap_enter_active(s, SWAP_FAILURE_RESOURCES); |
e04aad61 LP |
798 | } |
799 | ||
800 | static int swap_start(Unit *u) { | |
37cf8fee | 801 | Swap *s = SWAP(u), *other; |
e04aad61 LP |
802 | |
803 | assert(s); | |
804 | ||
805 | /* We cannot fulfill this request right now, try again later | |
806 | * please! */ | |
807 | ||
808 | if (s->state == SWAP_DEACTIVATING || | |
809 | s->state == SWAP_DEACTIVATING_SIGTERM || | |
810 | s->state == SWAP_DEACTIVATING_SIGKILL || | |
811 | s->state == SWAP_ACTIVATING_SIGTERM || | |
812 | s->state == SWAP_ACTIVATING_SIGKILL) | |
813 | return -EAGAIN; | |
814 | ||
815 | if (s->state == SWAP_ACTIVATING) | |
816 | return 0; | |
817 | ||
818 | assert(s->state == SWAP_DEAD || s->state == SWAP_FAILED); | |
819 | ||
75f86906 | 820 | if (detect_container() > 0) |
a5c3034f LP |
821 | return -EPERM; |
822 | ||
37cf8fee LP |
823 | /* If there's a job for another swap unit for the same node |
824 | * running, then let's not dispatch this one for now, and wait | |
825 | * until that other job has finished. */ | |
826 | LIST_FOREACH_OTHERS(same_devnode, other, s) | |
827 | if (UNIT(other)->job && UNIT(other)->job->state == JOB_RUNNING) | |
828 | return -EAGAIN; | |
829 | ||
e1770af8 | 830 | s->result = SWAP_SUCCESS; |
5ad096b3 LP |
831 | s->reset_cpu_usage = true; |
832 | ||
e04aad61 | 833 | swap_enter_activating(s); |
82a2b6bb | 834 | return 1; |
07b0b134 ML |
835 | } |
836 | ||
837 | static int swap_stop(Unit *u) { | |
838 | Swap *s = SWAP(u); | |
07b0b134 ML |
839 | |
840 | assert(s); | |
841 | ||
e04aad61 LP |
842 | if (s->state == SWAP_DEACTIVATING || |
843 | s->state == SWAP_DEACTIVATING_SIGTERM || | |
844 | s->state == SWAP_DEACTIVATING_SIGKILL || | |
845 | s->state == SWAP_ACTIVATING_SIGTERM || | |
846 | s->state == SWAP_ACTIVATING_SIGKILL) | |
847 | return 0; | |
07b0b134 | 848 | |
e04aad61 | 849 | assert(s->state == SWAP_ACTIVATING || |
5bcb0f2b | 850 | s->state == SWAP_ACTIVATING_DONE || |
e04aad61 | 851 | s->state == SWAP_ACTIVE); |
07b0b134 | 852 | |
75f86906 | 853 | if (detect_container() > 0) |
a5c3034f LP |
854 | return -EPERM; |
855 | ||
e1770af8 | 856 | swap_enter_deactivating(s); |
82a2b6bb | 857 | return 1; |
07b0b134 ML |
858 | } |
859 | ||
860 | static int swap_serialize(Unit *u, FILE *f, FDSet *fds) { | |
861 | Swap *s = SWAP(u); | |
862 | ||
863 | assert(s); | |
864 | assert(f); | |
865 | assert(fds); | |
866 | ||
867 | unit_serialize_item(u, f, "state", swap_state_to_string(s->state)); | |
e1770af8 | 868 | unit_serialize_item(u, f, "result", swap_result_to_string(s->result)); |
e04aad61 LP |
869 | |
870 | if (s->control_pid > 0) | |
de0671ee | 871 | unit_serialize_item_format(u, f, "control-pid", PID_FMT, s->control_pid); |
e04aad61 LP |
872 | |
873 | if (s->control_command_id >= 0) | |
874 | unit_serialize_item(u, f, "control-command", swap_exec_command_to_string(s->control_command_id)); | |
07b0b134 ML |
875 | |
876 | return 0; | |
877 | } | |
878 | ||
879 | static int swap_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
880 | Swap *s = SWAP(u); | |
881 | ||
882 | assert(s); | |
883 | assert(fds); | |
884 | ||
885 | if (streq(key, "state")) { | |
886 | SwapState state; | |
887 | ||
646134dc ZJS |
888 | state = swap_state_from_string(value); |
889 | if (state < 0) | |
f2341e0a | 890 | log_unit_debug(u, "Failed to parse state value: %s", value); |
07b0b134 ML |
891 | else |
892 | s->deserialized_state = state; | |
e1770af8 LP |
893 | } else if (streq(key, "result")) { |
894 | SwapResult f; | |
895 | ||
896 | f = swap_result_from_string(value); | |
897 | if (f < 0) | |
f2341e0a | 898 | log_unit_debug(u, "Failed to parse result value: %s", value); |
e1770af8 LP |
899 | else if (f != SWAP_SUCCESS) |
900 | s->result = f; | |
e04aad61 LP |
901 | } else if (streq(key, "control-pid")) { |
902 | pid_t pid; | |
903 | ||
904 | if (parse_pid(value, &pid) < 0) | |
f2341e0a | 905 | log_unit_debug(u, "Failed to parse control-pid value: %s", value); |
e04aad61 LP |
906 | else |
907 | s->control_pid = pid; | |
908 | ||
909 | } else if (streq(key, "control-command")) { | |
910 | SwapExecCommand id; | |
911 | ||
646134dc ZJS |
912 | id = swap_exec_command_from_string(value); |
913 | if (id < 0) | |
f2341e0a | 914 | log_unit_debug(u, "Failed to parse exec-command value: %s", value); |
e04aad61 LP |
915 | else { |
916 | s->control_command_id = id; | |
917 | s->control_command = s->exec_command + id; | |
918 | } | |
07b0b134 | 919 | } else |
f2341e0a | 920 | log_unit_debug(u, "Unknown serialization key: %s", key); |
07b0b134 ML |
921 | |
922 | return 0; | |
923 | } | |
924 | ||
44a6b1b6 | 925 | _pure_ static UnitActiveState swap_active_state(Unit *u) { |
07b0b134 ML |
926 | assert(u); |
927 | ||
928 | return state_translation_table[SWAP(u)->state]; | |
929 | } | |
930 | ||
44a6b1b6 | 931 | _pure_ static const char *swap_sub_state_to_string(Unit *u) { |
07b0b134 ML |
932 | assert(u); |
933 | ||
934 | return swap_state_to_string(SWAP(u)->state); | |
935 | } | |
936 | ||
44a6b1b6 | 937 | _pure_ static bool swap_check_gc(Unit *u) { |
07b0b134 ML |
938 | Swap *s = SWAP(u); |
939 | ||
940 | assert(s); | |
941 | ||
6b1dc2bd | 942 | return s->from_proc_swaps; |
07b0b134 ML |
943 | } |
944 | ||
e04aad61 LP |
945 | static void swap_sigchld_event(Unit *u, pid_t pid, int code, int status) { |
946 | Swap *s = SWAP(u); | |
e1770af8 | 947 | SwapResult f; |
e04aad61 LP |
948 | |
949 | assert(s); | |
950 | assert(pid >= 0); | |
951 | ||
952 | if (pid != s->control_pid) | |
953 | return; | |
954 | ||
955 | s->control_pid = 0; | |
956 | ||
96342de6 | 957 | if (is_clean_exit(code, status, NULL)) |
e1770af8 LP |
958 | f = SWAP_SUCCESS; |
959 | else if (code == CLD_EXITED) | |
960 | f = SWAP_FAILURE_EXIT_CODE; | |
961 | else if (code == CLD_KILLED) | |
962 | f = SWAP_FAILURE_SIGNAL; | |
963 | else if (code == CLD_DUMPED) | |
964 | f = SWAP_FAILURE_CORE_DUMP; | |
965 | else | |
966 | assert_not_reached("Unknown code"); | |
967 | ||
968 | if (f != SWAP_SUCCESS) | |
969 | s->result = f; | |
e04aad61 LP |
970 | |
971 | if (s->control_command) { | |
6ea832a2 | 972 | exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status); |
e1770af8 | 973 | |
e04aad61 LP |
974 | s->control_command = NULL; |
975 | s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; | |
976 | } | |
977 | ||
f2341e0a LP |
978 | log_unit_full(u, f == SWAP_SUCCESS ? LOG_DEBUG : LOG_NOTICE, 0, |
979 | "Swap process exited, code=%s status=%i", sigchld_code_to_string(code), status); | |
e04aad61 LP |
980 | |
981 | switch (s->state) { | |
982 | ||
983 | case SWAP_ACTIVATING: | |
5bcb0f2b | 984 | case SWAP_ACTIVATING_DONE: |
e04aad61 LP |
985 | case SWAP_ACTIVATING_SIGTERM: |
986 | case SWAP_ACTIVATING_SIGKILL: | |
987 | ||
e1770af8 LP |
988 | if (f == SWAP_SUCCESS) |
989 | swap_enter_active(s, f); | |
e04aad61 | 990 | else |
e1770af8 | 991 | swap_enter_dead(s, f); |
e04aad61 LP |
992 | break; |
993 | ||
994 | case SWAP_DEACTIVATING: | |
995 | case SWAP_DEACTIVATING_SIGKILL: | |
996 | case SWAP_DEACTIVATING_SIGTERM: | |
997 | ||
7bb01eff | 998 | swap_enter_dead(s, f); |
e04aad61 LP |
999 | break; |
1000 | ||
1001 | default: | |
1002 | assert_not_reached("Uh, control process died at wrong time."); | |
1003 | } | |
1004 | ||
1005 | /* Notify clients about changed exit status */ | |
1006 | unit_add_to_dbus_queue(u); | |
e04aad61 LP |
1007 | } |
1008 | ||
718db961 LP |
1009 | static int swap_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) { |
1010 | Swap *s = SWAP(userdata); | |
e04aad61 LP |
1011 | |
1012 | assert(s); | |
718db961 | 1013 | assert(s->timer_event_source == source); |
e04aad61 LP |
1014 | |
1015 | switch (s->state) { | |
1016 | ||
1017 | case SWAP_ACTIVATING: | |
5bcb0f2b | 1018 | case SWAP_ACTIVATING_DONE: |
f2341e0a | 1019 | log_unit_warning(UNIT(s), "Activation timed out. Stopping."); |
e1770af8 | 1020 | swap_enter_signal(s, SWAP_ACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT); |
e04aad61 LP |
1021 | break; |
1022 | ||
1023 | case SWAP_DEACTIVATING: | |
f2341e0a | 1024 | log_unit_warning(UNIT(s), "Deactivation timed out. Stopping."); |
e1770af8 | 1025 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT); |
e04aad61 LP |
1026 | break; |
1027 | ||
1028 | case SWAP_ACTIVATING_SIGTERM: | |
4819ff03 | 1029 | if (s->kill_context.send_sigkill) { |
f2341e0a | 1030 | log_unit_warning(UNIT(s), "Activation timed out. Killing."); |
e1770af8 | 1031 | swap_enter_signal(s, SWAP_ACTIVATING_SIGKILL, SWAP_FAILURE_TIMEOUT); |
ba035df2 | 1032 | } else { |
f2341e0a | 1033 | log_unit_warning(UNIT(s), "Activation timed out. Skipping SIGKILL. Ignoring."); |
e1770af8 | 1034 | swap_enter_dead(s, SWAP_FAILURE_TIMEOUT); |
ba035df2 | 1035 | } |
e04aad61 LP |
1036 | break; |
1037 | ||
1038 | case SWAP_DEACTIVATING_SIGTERM: | |
4819ff03 | 1039 | if (s->kill_context.send_sigkill) { |
f2341e0a | 1040 | log_unit_warning(UNIT(s), "Deactivation timed out. Killing."); |
e1770af8 | 1041 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, SWAP_FAILURE_TIMEOUT); |
ba035df2 | 1042 | } else { |
f2341e0a | 1043 | log_unit_warning(UNIT(s), "Deactivation timed out. Skipping SIGKILL. Ignoring."); |
e1770af8 | 1044 | swap_enter_dead(s, SWAP_FAILURE_TIMEOUT); |
ba035df2 | 1045 | } |
e04aad61 LP |
1046 | break; |
1047 | ||
1048 | case SWAP_ACTIVATING_SIGKILL: | |
1049 | case SWAP_DEACTIVATING_SIGKILL: | |
f2341e0a | 1050 | log_unit_warning(UNIT(s), "Swap process still around after SIGKILL. Ignoring."); |
e1770af8 | 1051 | swap_enter_dead(s, SWAP_FAILURE_TIMEOUT); |
e04aad61 LP |
1052 | break; |
1053 | ||
1054 | default: | |
1055 | assert_not_reached("Timeout at wrong time."); | |
1056 | } | |
718db961 LP |
1057 | |
1058 | return 0; | |
e04aad61 LP |
1059 | } |
1060 | ||
1061 | static int swap_load_proc_swaps(Manager *m, bool set_flags) { | |
1062 | unsigned i; | |
1063 | int r = 0; | |
1064 | ||
1065 | assert(m); | |
1066 | ||
07b0b134 | 1067 | rewind(m->proc_swaps); |
bab45044 | 1068 | |
4e85aff4 | 1069 | (void) fscanf(m->proc_swaps, "%*s %*s %*s %*s %*s\n"); |
07b0b134 | 1070 | |
e04aad61 | 1071 | for (i = 1;; i++) { |
9fb3675e | 1072 | _cleanup_free_ char *dev = NULL, *d = NULL; |
07b0b134 ML |
1073 | int prio = 0, k; |
1074 | ||
646134dc ZJS |
1075 | k = fscanf(m->proc_swaps, |
1076 | "%ms " /* device/file */ | |
1077 | "%*s " /* type of swap */ | |
1078 | "%*s " /* swap size */ | |
1079 | "%*s " /* used */ | |
1080 | "%i\n", /* priority */ | |
1081 | &dev, &prio); | |
1082 | if (k != 2) { | |
07b0b134 | 1083 | if (k == EOF) |
4e85aff4 | 1084 | break; |
07b0b134 | 1085 | |
628c89cc | 1086 | log_warning("Failed to parse /proc/swaps:%u.", i); |
e04aad61 | 1087 | continue; |
07b0b134 | 1088 | } |
07b0b134 | 1089 | |
527b7a42 | 1090 | if (cunescape(dev, UNESCAPE_RELAX, &d) < 0) |
628c89cc LP |
1091 | return log_oom(); |
1092 | ||
1093 | device_found_node(m, d, true, DEVICE_FOUND_SWAP, set_flags); | |
4e85aff4 | 1094 | |
628c89cc | 1095 | k = swap_process_new(m, d, prio, set_flags); |
07b0b134 | 1096 | if (k < 0) |
e04aad61 | 1097 | r = k; |
07b0b134 ML |
1098 | } |
1099 | ||
e04aad61 LP |
1100 | return r; |
1101 | } | |
1102 | ||
718db961 LP |
1103 | static int swap_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) { |
1104 | Manager *m = userdata; | |
595ed347 | 1105 | Unit *u; |
4e434314 LP |
1106 | int r; |
1107 | ||
1108 | assert(m); | |
718db961 | 1109 | assert(revents & EPOLLPRI); |
4e434314 | 1110 | |
646134dc ZJS |
1111 | r = swap_load_proc_swaps(m, true); |
1112 | if (r < 0) { | |
da927ba9 | 1113 | log_error_errno(r, "Failed to reread /proc/swaps: %m"); |
e04aad61 LP |
1114 | |
1115 | /* Reset flags, just in case, for late calls */ | |
595ed347 MS |
1116 | LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) { |
1117 | Swap *swap = SWAP(u); | |
e04aad61 LP |
1118 | |
1119 | swap->is_active = swap->just_activated = false; | |
1120 | } | |
1121 | ||
1122 | return 0; | |
1123 | } | |
1124 | ||
1125 | manager_dispatch_load_queue(m); | |
1126 | ||
595ed347 MS |
1127 | LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) { |
1128 | Swap *swap = SWAP(u); | |
e04aad61 LP |
1129 | |
1130 | if (!swap->is_active) { | |
1131 | /* This has just been deactivated */ | |
1132 | ||
e04aad61 LP |
1133 | swap_unset_proc_swaps(swap); |
1134 | ||
1135 | switch (swap->state) { | |
1136 | ||
1137 | case SWAP_ACTIVE: | |
e1770af8 | 1138 | swap_enter_dead(swap, SWAP_SUCCESS); |
e04aad61 LP |
1139 | break; |
1140 | ||
1141 | default: | |
5bcb0f2b | 1142 | /* Fire again */ |
e04aad61 LP |
1143 | swap_set_state(swap, swap->state); |
1144 | break; | |
1145 | } | |
1146 | ||
628c89cc LP |
1147 | if (swap->what) |
1148 | device_found_node(m, swap->what, false, DEVICE_FOUND_SWAP, true); | |
1149 | ||
e04aad61 LP |
1150 | } else if (swap->just_activated) { |
1151 | ||
1152 | /* New swap entry */ | |
1153 | ||
1154 | switch (swap->state) { | |
1155 | ||
1156 | case SWAP_DEAD: | |
1157 | case SWAP_FAILED: | |
e1770af8 | 1158 | swap_enter_active(swap, SWAP_SUCCESS); |
e04aad61 LP |
1159 | break; |
1160 | ||
5bcb0f2b LP |
1161 | case SWAP_ACTIVATING: |
1162 | swap_set_state(swap, SWAP_ACTIVATING_DONE); | |
1163 | break; | |
1164 | ||
e04aad61 LP |
1165 | default: |
1166 | /* Nothing really changed, but let's | |
1167 | * issue an notification call | |
1168 | * nonetheless, in case somebody is | |
1169 | * waiting for this. */ | |
1170 | swap_set_state(swap, swap->state); | |
1171 | break; | |
1172 | } | |
1173 | } | |
1174 | ||
1175 | /* Reset the flags for later calls */ | |
1176 | swap->is_active = swap->just_activated = false; | |
1177 | } | |
1178 | ||
1179 | return 1; | |
1180 | } | |
1181 | ||
1182 | static Unit *swap_following(Unit *u) { | |
1183 | Swap *s = SWAP(u); | |
1184 | Swap *other, *first = NULL; | |
1185 | ||
1186 | assert(s); | |
1187 | ||
cdc89820 ZJS |
1188 | /* If the user configured the swap through /etc/fstab or |
1189 | * a device unit, follow that. */ | |
1190 | ||
1191 | if (s->from_fragment) | |
e04aad61 LP |
1192 | return NULL; |
1193 | ||
caac2704 | 1194 | LIST_FOREACH_OTHERS(same_devnode, other, s) |
cdc89820 ZJS |
1195 | if (other->from_fragment) |
1196 | return UNIT(other); | |
1197 | ||
1198 | /* Otherwise make everybody follow the unit that's named after | |
1199 | * the swap device in the kernel */ | |
1200 | ||
1201 | if (streq_ptr(s->what, s->devnode)) | |
1202 | return NULL; | |
e04aad61 | 1203 | |
9670d583 LP |
1204 | LIST_FOREACH_AFTER(same_devnode, other, s) |
1205 | if (streq_ptr(other->what, other->devnode)) | |
e04aad61 LP |
1206 | return UNIT(other); |
1207 | ||
9670d583 LP |
1208 | LIST_FOREACH_BEFORE(same_devnode, other, s) { |
1209 | if (streq_ptr(other->what, other->devnode)) | |
e04aad61 LP |
1210 | return UNIT(other); |
1211 | ||
1212 | first = other; | |
1213 | } | |
1214 | ||
cdc89820 | 1215 | /* Fall back to the first on the list */ |
e04aad61 | 1216 | return UNIT(first); |
07b0b134 ML |
1217 | } |
1218 | ||
6210e7fc | 1219 | static int swap_following_set(Unit *u, Set **_set) { |
5bcb0f2b | 1220 | Swap *s = SWAP(u), *other; |
6210e7fc LP |
1221 | Set *set; |
1222 | int r; | |
1223 | ||
1224 | assert(s); | |
1225 | assert(_set); | |
1226 | ||
9670d583 | 1227 | if (LIST_JUST_US(same_devnode, s)) { |
6210e7fc LP |
1228 | *_set = NULL; |
1229 | return 0; | |
1230 | } | |
1231 | ||
d5099efc | 1232 | set = set_new(NULL); |
5bcb0f2b | 1233 | if (!set) |
6210e7fc LP |
1234 | return -ENOMEM; |
1235 | ||
caac2704 | 1236 | LIST_FOREACH_OTHERS(same_devnode, other, s) { |
5bcb0f2b LP |
1237 | r = set_put(set, other); |
1238 | if (r < 0) | |
6210e7fc | 1239 | goto fail; |
5bcb0f2b | 1240 | } |
6210e7fc LP |
1241 | |
1242 | *_set = set; | |
1243 | return 1; | |
1244 | ||
1245 | fail: | |
1246 | set_free(set); | |
1247 | return r; | |
1248 | } | |
1249 | ||
07b0b134 ML |
1250 | static void swap_shutdown(Manager *m) { |
1251 | assert(m); | |
1252 | ||
718db961 LP |
1253 | m->swap_event_source = sd_event_source_unref(m->swap_event_source); |
1254 | ||
07b0b134 ML |
1255 | if (m->proc_swaps) { |
1256 | fclose(m->proc_swaps); | |
1257 | m->proc_swaps = NULL; | |
1258 | } | |
e04aad61 | 1259 | |
9670d583 LP |
1260 | hashmap_free(m->swaps_by_devnode); |
1261 | m->swaps_by_devnode = NULL; | |
07b0b134 ML |
1262 | } |
1263 | ||
07b0b134 ML |
1264 | static int swap_enumerate(Manager *m) { |
1265 | int r; | |
9670d583 | 1266 | |
07b0b134 ML |
1267 | assert(m); |
1268 | ||
4e434314 | 1269 | if (!m->proc_swaps) { |
646134dc ZJS |
1270 | m->proc_swaps = fopen("/proc/swaps", "re"); |
1271 | if (!m->proc_swaps) | |
718db961 | 1272 | return errno == ENOENT ? 0 : -errno; |
4e434314 | 1273 | |
151b9b96 | 1274 | r = sd_event_add_io(m->event, &m->swap_event_source, fileno(m->proc_swaps), EPOLLPRI, swap_dispatch_io, m); |
718db961 | 1275 | if (r < 0) |
29083707 LP |
1276 | goto fail; |
1277 | ||
1278 | /* Dispatch this before we dispatch SIGCHLD, so that | |
1279 | * we always get the events from /proc/swaps before | |
1280 | * the SIGCHLD of /sbin/swapon. */ | |
1281 | r = sd_event_source_set_priority(m->swap_event_source, -10); | |
1282 | if (r < 0) | |
718db961 | 1283 | goto fail; |
7dfbe2e3 TG |
1284 | |
1285 | (void) sd_event_source_set_description(m->swap_event_source, "swap-proc"); | |
4e434314 LP |
1286 | } |
1287 | ||
646134dc ZJS |
1288 | r = swap_load_proc_swaps(m, false); |
1289 | if (r < 0) | |
718db961 LP |
1290 | goto fail; |
1291 | ||
1292 | return 0; | |
07b0b134 | 1293 | |
718db961 LP |
1294 | fail: |
1295 | swap_shutdown(m); | |
07b0b134 ML |
1296 | return r; |
1297 | } | |
1298 | ||
628c89cc | 1299 | int swap_process_device_new(Manager *m, struct udev_device *dev) { |
9670d583 LP |
1300 | struct udev_list_entry *item = NULL, *first = NULL; |
1301 | _cleanup_free_ char *e = NULL; | |
1302 | const char *dn; | |
1303 | Swap *s; | |
1304 | int r = 0; | |
1305 | ||
1306 | assert(m); | |
1307 | assert(dev); | |
1308 | ||
1309 | dn = udev_device_get_devnode(dev); | |
1310 | if (!dn) | |
1311 | return 0; | |
1312 | ||
7410616c LP |
1313 | r = unit_name_from_path(dn, ".swap", &e); |
1314 | if (r < 0) | |
1315 | return r; | |
9670d583 LP |
1316 | |
1317 | s = hashmap_get(m->units, e); | |
1318 | if (s) | |
1319 | r = swap_set_devnode(s, dn); | |
1320 | ||
1321 | first = udev_device_get_devlinks_list_entry(dev); | |
1322 | udev_list_entry_foreach(item, first) { | |
1323 | _cleanup_free_ char *n = NULL; | |
7410616c | 1324 | int q; |
9670d583 | 1325 | |
7410616c LP |
1326 | q = unit_name_from_path(udev_list_entry_get_name(item), ".swap", &n); |
1327 | if (q < 0) | |
1328 | return q; | |
9670d583 LP |
1329 | |
1330 | s = hashmap_get(m->units, n); | |
1331 | if (s) { | |
9670d583 LP |
1332 | q = swap_set_devnode(s, dn); |
1333 | if (q < 0) | |
1334 | r = q; | |
1335 | } | |
1336 | } | |
1337 | ||
1338 | return r; | |
1339 | } | |
1340 | ||
628c89cc | 1341 | int swap_process_device_remove(Manager *m, struct udev_device *dev) { |
9670d583 LP |
1342 | const char *dn; |
1343 | int r = 0; | |
1344 | Swap *s; | |
1345 | ||
1346 | dn = udev_device_get_devnode(dev); | |
1347 | if (!dn) | |
1348 | return 0; | |
1349 | ||
1350 | while ((s = hashmap_get(m->swaps_by_devnode, dn))) { | |
1351 | int q; | |
1352 | ||
1353 | q = swap_set_devnode(s, NULL); | |
1354 | if (q < 0) | |
1355 | r = q; | |
1356 | } | |
1357 | ||
1358 | return r; | |
1359 | } | |
1360 | ||
fdf20a31 | 1361 | static void swap_reset_failed(Unit *u) { |
5632e374 LP |
1362 | Swap *s = SWAP(u); |
1363 | ||
1364 | assert(s); | |
1365 | ||
fdf20a31 | 1366 | if (s->state == SWAP_FAILED) |
5632e374 | 1367 | swap_set_state(s, SWAP_DEAD); |
e04aad61 | 1368 | |
e1770af8 | 1369 | s->result = SWAP_SUCCESS; |
5632e374 LP |
1370 | } |
1371 | ||
718db961 | 1372 | static int swap_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) { |
814cc562 | 1373 | return unit_kill_common(u, who, signo, -1, SWAP(u)->control_pid, error); |
8a0867d6 LP |
1374 | } |
1375 | ||
68db7a3b ZJS |
1376 | static int swap_get_timeout(Unit *u, uint64_t *timeout) { |
1377 | Swap *s = SWAP(u); | |
1378 | int r; | |
1379 | ||
1380 | if (!s->timer_event_source) | |
1381 | return 0; | |
1382 | ||
1383 | r = sd_event_source_get_time(s->timer_event_source, timeout); | |
1384 | if (r < 0) | |
1385 | return r; | |
1386 | ||
1387 | return 1; | |
1388 | } | |
1389 | ||
1c2e9646 | 1390 | static bool swap_supported(void) { |
0faacd47 LP |
1391 | static int supported = -1; |
1392 | ||
1393 | /* If swap support is not available in the kernel, or we are | |
1394 | * running in a container we don't support swap units, and any | |
1395 | * attempts to starting one should fail immediately. */ | |
1396 | ||
1397 | if (supported < 0) | |
1398 | supported = | |
1399 | access("/proc/swaps", F_OK) >= 0 && | |
75f86906 | 1400 | detect_container() <= 0; |
0faacd47 LP |
1401 | |
1402 | return supported; | |
1403 | } | |
1404 | ||
5632e374 LP |
1405 | static const char* const swap_state_table[_SWAP_STATE_MAX] = { |
1406 | [SWAP_DEAD] = "dead", | |
e04aad61 | 1407 | [SWAP_ACTIVATING] = "activating", |
5bcb0f2b | 1408 | [SWAP_ACTIVATING_DONE] = "activating-done", |
5632e374 | 1409 | [SWAP_ACTIVE] = "active", |
e04aad61 LP |
1410 | [SWAP_DEACTIVATING] = "deactivating", |
1411 | [SWAP_ACTIVATING_SIGTERM] = "activating-sigterm", | |
1412 | [SWAP_ACTIVATING_SIGKILL] = "activating-sigkill", | |
1413 | [SWAP_DEACTIVATING_SIGTERM] = "deactivating-sigterm", | |
1414 | [SWAP_DEACTIVATING_SIGKILL] = "deactivating-sigkill", | |
fdf20a31 | 1415 | [SWAP_FAILED] = "failed" |
5632e374 LP |
1416 | }; |
1417 | ||
1418 | DEFINE_STRING_TABLE_LOOKUP(swap_state, SwapState); | |
1419 | ||
e04aad61 LP |
1420 | static const char* const swap_exec_command_table[_SWAP_EXEC_COMMAND_MAX] = { |
1421 | [SWAP_EXEC_ACTIVATE] = "ExecActivate", | |
1422 | [SWAP_EXEC_DEACTIVATE] = "ExecDeactivate", | |
1423 | }; | |
1424 | ||
1425 | DEFINE_STRING_TABLE_LOOKUP(swap_exec_command, SwapExecCommand); | |
1426 | ||
e1770af8 LP |
1427 | static const char* const swap_result_table[_SWAP_RESULT_MAX] = { |
1428 | [SWAP_SUCCESS] = "success", | |
1429 | [SWAP_FAILURE_RESOURCES] = "resources", | |
1430 | [SWAP_FAILURE_TIMEOUT] = "timeout", | |
1431 | [SWAP_FAILURE_EXIT_CODE] = "exit-code", | |
1432 | [SWAP_FAILURE_SIGNAL] = "signal", | |
1433 | [SWAP_FAILURE_CORE_DUMP] = "core-dump" | |
1434 | }; | |
1435 | ||
1436 | DEFINE_STRING_TABLE_LOOKUP(swap_result, SwapResult); | |
1437 | ||
07b0b134 | 1438 | const UnitVTable swap_vtable = { |
7d17cfbc | 1439 | .object_size = sizeof(Swap), |
718db961 LP |
1440 | .exec_context_offset = offsetof(Swap, exec_context), |
1441 | .cgroup_context_offset = offsetof(Swap, cgroup_context), | |
1442 | .kill_context_offset = offsetof(Swap, kill_context), | |
613b411c | 1443 | .exec_runtime_offset = offsetof(Swap, exec_runtime), |
3ef63c31 | 1444 | |
f975e971 LP |
1445 | .sections = |
1446 | "Unit\0" | |
1447 | "Swap\0" | |
1448 | "Install\0", | |
4ad49000 | 1449 | .private_section = "Swap", |
71645aca | 1450 | |
e04aad61 | 1451 | .no_alias = true, |
07b0b134 ML |
1452 | .no_instances = true, |
1453 | ||
4e85aff4 | 1454 | .init = swap_init, |
07b0b134 | 1455 | .load = swap_load, |
6e620bec | 1456 | .done = swap_done, |
07b0b134 ML |
1457 | |
1458 | .coldplug = swap_coldplug, | |
1459 | ||
1460 | .dump = swap_dump, | |
1461 | ||
1462 | .start = swap_start, | |
1463 | .stop = swap_stop, | |
1464 | ||
8a0867d6 LP |
1465 | .kill = swap_kill, |
1466 | ||
68db7a3b ZJS |
1467 | .get_timeout = swap_get_timeout, |
1468 | ||
07b0b134 ML |
1469 | .serialize = swap_serialize, |
1470 | .deserialize_item = swap_deserialize_item, | |
1471 | ||
1472 | .active_state = swap_active_state, | |
1473 | .sub_state_to_string = swap_sub_state_to_string, | |
1474 | ||
1475 | .check_gc = swap_check_gc, | |
1476 | ||
e04aad61 | 1477 | .sigchld_event = swap_sigchld_event, |
e04aad61 LP |
1478 | |
1479 | .reset_failed = swap_reset_failed, | |
1480 | ||
718db961 | 1481 | .bus_vtable = bus_swap_vtable, |
74c964d3 LP |
1482 | .bus_set_property = bus_swap_set_property, |
1483 | .bus_commit_properties = bus_swap_commit_properties, | |
07b0b134 | 1484 | |
e04aad61 | 1485 | .following = swap_following, |
6210e7fc | 1486 | .following_set = swap_following_set, |
5632e374 | 1487 | |
6e620bec | 1488 | .enumerate = swap_enumerate, |
c6918296 | 1489 | .shutdown = swap_shutdown, |
0faacd47 | 1490 | .supported = swap_supported, |
c6918296 MS |
1491 | |
1492 | .status_message_formats = { | |
1493 | .starting_stopping = { | |
1494 | [0] = "Activating swap %s...", | |
1495 | [1] = "Deactivating swap %s...", | |
1496 | }, | |
1497 | .finished_start_job = { | |
1498 | [JOB_DONE] = "Activated swap %s.", | |
1499 | [JOB_FAILED] = "Failed to activate swap %s.", | |
c6918296 MS |
1500 | [JOB_TIMEOUT] = "Timed out activating swap %s.", |
1501 | }, | |
1502 | .finished_stop_job = { | |
1503 | [JOB_DONE] = "Deactivated swap %s.", | |
1504 | [JOB_FAILED] = "Failed deactivating swap %s.", | |
1505 | [JOB_TIMEOUT] = "Timed out deactivating swap %s.", | |
1506 | }, | |
1507 | }, | |
07b0b134 | 1508 | }; |