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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 ML |
23 | #include <sys/epoll.h> |
24 | #include <sys/stat.h> | |
4f5dd394 | 25 | #include <unistd.h> |
07b0b134 | 26 | |
07630cea LP |
27 | #include "libudev.h" |
28 | ||
07b0b134 | 29 | #include "dbus-swap.h" |
4f5dd394 | 30 | #include "escape.h" |
9a57c629 | 31 | #include "exit-status.h" |
4f5dd394 LP |
32 | #include "formats-util.h" |
33 | #include "fstab-util.h" | |
9eb977db | 34 | #include "path-util.h" |
4f5dd394 | 35 | #include "special.h" |
07630cea | 36 | #include "string-util.h" |
5bcb0f2b | 37 | #include "udev-util.h" |
4f5dd394 LP |
38 | #include "unit-name.h" |
39 | #include "unit.h" | |
40 | #include "virt.h" | |
41 | #include "swap.h" | |
07b0b134 ML |
42 | |
43 | static const UnitActiveState state_translation_table[_SWAP_STATE_MAX] = { | |
44 | [SWAP_DEAD] = UNIT_INACTIVE, | |
e04aad61 | 45 | [SWAP_ACTIVATING] = UNIT_ACTIVATING, |
5bcb0f2b | 46 | [SWAP_ACTIVATING_DONE] = UNIT_ACTIVE, |
07b0b134 | 47 | [SWAP_ACTIVE] = UNIT_ACTIVE, |
e04aad61 LP |
48 | [SWAP_DEACTIVATING] = UNIT_DEACTIVATING, |
49 | [SWAP_ACTIVATING_SIGTERM] = UNIT_DEACTIVATING, | |
50 | [SWAP_ACTIVATING_SIGKILL] = UNIT_DEACTIVATING, | |
51 | [SWAP_DEACTIVATING_SIGTERM] = UNIT_DEACTIVATING, | |
52 | [SWAP_DEACTIVATING_SIGKILL] = UNIT_DEACTIVATING, | |
fdf20a31 | 53 | [SWAP_FAILED] = UNIT_FAILED |
07b0b134 ML |
54 | }; |
55 | ||
718db961 LP |
56 | static int swap_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata); |
57 | static int swap_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata); | |
58 | ||
e04aad61 | 59 | static void swap_unset_proc_swaps(Swap *s) { |
9670d583 LP |
60 | assert(s); |
61 | ||
62 | if (!s->from_proc_swaps) | |
63 | return; | |
64 | ||
a1e58e8e | 65 | s->parameters_proc_swaps.what = mfree(s->parameters_proc_swaps.what); |
9670d583 LP |
66 | |
67 | s->from_proc_swaps = false; | |
68 | } | |
69 | ||
70 | static int swap_set_devnode(Swap *s, const char *devnode) { | |
df326b84 | 71 | Hashmap *swaps; |
5bcb0f2b | 72 | Swap *first; |
9670d583 | 73 | int r; |
e04aad61 LP |
74 | |
75 | assert(s); | |
76 | ||
d5099efc | 77 | r = hashmap_ensure_allocated(&UNIT(s)->manager->swaps_by_devnode, &string_hash_ops); |
9670d583 LP |
78 | if (r < 0) |
79 | return r; | |
e04aad61 | 80 | |
9670d583 | 81 | swaps = UNIT(s)->manager->swaps_by_devnode; |
e04aad61 | 82 | |
9670d583 LP |
83 | if (s->devnode) { |
84 | first = hashmap_get(swaps, s->devnode); | |
e04aad61 | 85 | |
9670d583 LP |
86 | LIST_REMOVE(same_devnode, first, s); |
87 | if (first) | |
88 | hashmap_replace(swaps, first->devnode, first); | |
89 | else | |
90 | hashmap_remove(swaps, s->devnode); | |
5bcb0f2b | 91 | |
a1e58e8e | 92 | s->devnode = mfree(s->devnode); |
9670d583 LP |
93 | } |
94 | ||
95 | if (devnode) { | |
96 | s->devnode = strdup(devnode); | |
97 | if (!s->devnode) | |
98 | return -ENOMEM; | |
99 | ||
100 | first = hashmap_get(swaps, s->devnode); | |
101 | LIST_PREPEND(same_devnode, first, s); | |
102 | ||
103 | return hashmap_replace(swaps, first->devnode, first); | |
104 | } | |
105 | ||
106 | return 0; | |
e04aad61 LP |
107 | } |
108 | ||
f6cebb3b | 109 | static void swap_init(Unit *u) { |
6e620bec LP |
110 | Swap *s = SWAP(u); |
111 | ||
112 | assert(s); | |
1124fe6f | 113 | assert(UNIT(s)->load_state == UNIT_STUB); |
6e620bec | 114 | |
1f19a534 | 115 | s->timeout_usec = u->manager->default_timeout_start_usec; |
e04aad61 | 116 | |
ac155bb8 MS |
117 | s->exec_context.std_output = u->manager->default_std_output; |
118 | s->exec_context.std_error = u->manager->default_std_error; | |
085afe36 | 119 | |
6b1dc2bd | 120 | s->parameters_proc_swaps.priority = s->parameters_fragment.priority = -1; |
e04aad61 | 121 | |
e1770af8 | 122 | s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; |
c8f4d764 | 123 | |
5bcb0f2b | 124 | u->ignore_on_isolate = true; |
e04aad61 LP |
125 | } |
126 | ||
127 | static void swap_unwatch_control_pid(Swap *s) { | |
128 | assert(s); | |
129 | ||
130 | if (s->control_pid <= 0) | |
131 | return; | |
132 | ||
133 | unit_unwatch_pid(UNIT(s), s->control_pid); | |
134 | s->control_pid = 0; | |
6e620bec LP |
135 | } |
136 | ||
4e85aff4 LP |
137 | static void swap_done(Unit *u) { |
138 | Swap *s = SWAP(u); | |
07b0b134 | 139 | |
4e85aff4 | 140 | assert(s); |
07b0b134 | 141 | |
e04aad61 | 142 | swap_unset_proc_swaps(s); |
9670d583 | 143 | swap_set_devnode(s, NULL); |
e04aad61 | 144 | |
a1e58e8e LP |
145 | s->what = mfree(s->what); |
146 | s->parameters_fragment.what = mfree(s->parameters_fragment.what); | |
147 | s->parameters_fragment.options = mfree(s->parameters_fragment.options); | |
86b23b07 | 148 | |
613b411c | 149 | s->exec_runtime = exec_runtime_unref(s->exec_runtime); |
e04aad61 LP |
150 | exec_command_done_array(s->exec_command, _SWAP_EXEC_COMMAND_MAX); |
151 | s->control_command = NULL; | |
152 | ||
153 | swap_unwatch_control_pid(s); | |
154 | ||
718db961 LP |
155 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
156 | } | |
157 | ||
158 | static int swap_arm_timer(Swap *s) { | |
159 | int r; | |
160 | ||
161 | assert(s); | |
162 | ||
163 | if (s->timeout_usec <= 0) { | |
164 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); | |
165 | return 0; | |
166 | } | |
167 | ||
168 | if (s->timer_event_source) { | |
169 | r = sd_event_source_set_time(s->timer_event_source, now(CLOCK_MONOTONIC) + s->timeout_usec); | |
170 | if (r < 0) | |
171 | return r; | |
172 | ||
173 | return sd_event_source_set_enabled(s->timer_event_source, SD_EVENT_ONESHOT); | |
174 | } | |
175 | ||
7dfbe2e3 | 176 | r = sd_event_add_time( |
6a0f1f6d LP |
177 | UNIT(s)->manager->event, |
178 | &s->timer_event_source, | |
179 | CLOCK_MONOTONIC, | |
180 | now(CLOCK_MONOTONIC) + s->timeout_usec, 0, | |
181 | swap_dispatch_timer, s); | |
7dfbe2e3 TG |
182 | if (r < 0) |
183 | return r; | |
184 | ||
185 | (void) sd_event_source_set_description(s->timer_event_source, "swap-timer"); | |
186 | ||
187 | return 0; | |
07b0b134 ML |
188 | } |
189 | ||
173a8d04 | 190 | static int swap_add_device_links(Swap *s) { |
173a8d04 LP |
191 | assert(s); |
192 | ||
193 | if (!s->what) | |
194 | return 0; | |
195 | ||
f10af76d LP |
196 | if (!s->from_fragment) |
197 | return 0; | |
198 | ||
cfcfd4ae | 199 | if (is_device_path(s->what)) |
b2c23da8 | 200 | return unit_add_node_link(UNIT(s), s->what, UNIT(s)->manager->running_as == MANAGER_SYSTEM); |
cfcfd4ae LP |
201 | else |
202 | /* File based swap devices need to be ordered after | |
2b93b027 | 203 | * systemd-remount-fs.service, since they might need a |
cfcfd4ae | 204 | * writable file system. */ |
2b93b027 | 205 | return unit_add_dependency_by_name(UNIT(s), UNIT_AFTER, SPECIAL_REMOUNT_FS_SERVICE, NULL, true); |
173a8d04 LP |
206 | } |
207 | ||
2edd4434 | 208 | static int swap_add_default_dependencies(Swap *s) { |
2edd4434 LP |
209 | assert(s); |
210 | ||
b2c23da8 | 211 | if (UNIT(s)->manager->running_as != MANAGER_SYSTEM) |
6b1dc2bd | 212 | return 0; |
2edd4434 | 213 | |
75f86906 | 214 | if (detect_container() > 0) |
c0387ebf LP |
215 | return 0; |
216 | ||
5607d856 | 217 | return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true); |
2edd4434 LP |
218 | } |
219 | ||
4e85aff4 | 220 | static int swap_verify(Swap *s) { |
7fd1b19b | 221 | _cleanup_free_ char *e = NULL; |
7410616c | 222 | int r; |
4e85aff4 | 223 | |
1124fe6f | 224 | if (UNIT(s)->load_state != UNIT_LOADED) |
5bcb0f2b | 225 | return 0; |
4e85aff4 | 226 | |
7410616c LP |
227 | r = unit_name_from_path(s->what, ".swap", &e); |
228 | if (r < 0) | |
f2341e0a | 229 | return log_unit_error_errno(UNIT(s), r, "Failed to generate unit name from path: %m"); |
4e85aff4 | 230 | |
7410616c | 231 | if (!unit_has_name(UNIT(s), e)) { |
f2341e0a | 232 | log_unit_error(UNIT(s), "Value of What= and unit name do not match, not loading."); |
4e85aff4 LP |
233 | return -EINVAL; |
234 | } | |
235 | ||
4819ff03 | 236 | if (s->exec_context.pam_name && s->kill_context.kill_mode != KILL_CONTROL_GROUP) { |
f2341e0a | 237 | log_unit_error(UNIT(s), "Unit has PAM enabled. Kill mode must be set to 'control-group'. Refusing to load."); |
e04aad61 LP |
238 | return -EINVAL; |
239 | } | |
240 | ||
4e85aff4 LP |
241 | return 0; |
242 | } | |
243 | ||
9670d583 LP |
244 | static int swap_load_devnode(Swap *s) { |
245 | _cleanup_udev_device_unref_ struct udev_device *d = NULL; | |
246 | struct stat st; | |
247 | const char *p; | |
248 | ||
249 | assert(s); | |
250 | ||
251 | if (stat(s->what, &st) < 0 || !S_ISBLK(st.st_mode)) | |
252 | return 0; | |
253 | ||
254 | d = udev_device_new_from_devnum(UNIT(s)->manager->udev, 'b', st.st_rdev); | |
255 | if (!d) | |
256 | return 0; | |
257 | ||
258 | p = udev_device_get_devnode(d); | |
259 | if (!p) | |
260 | return 0; | |
261 | ||
262 | return swap_set_devnode(s, p); | |
263 | } | |
264 | ||
07b0b134 ML |
265 | static int swap_load(Unit *u) { |
266 | int r; | |
267 | Swap *s = SWAP(u); | |
268 | ||
269 | assert(s); | |
ac155bb8 | 270 | assert(u->load_state == UNIT_STUB); |
07b0b134 ML |
271 | |
272 | /* Load a .swap file */ | |
646134dc ZJS |
273 | r = unit_load_fragment_and_dropin_optional(u); |
274 | if (r < 0) | |
07b0b134 ML |
275 | return r; |
276 | ||
ac155bb8 | 277 | if (u->load_state == UNIT_LOADED) { |
4e85aff4 | 278 | |
1124fe6f | 279 | if (UNIT(s)->fragment_path) |
4e85aff4 LP |
280 | s->from_fragment = true; |
281 | ||
282 | if (!s->what) { | |
283 | if (s->parameters_fragment.what) | |
284 | s->what = strdup(s->parameters_fragment.what); | |
4e85aff4 LP |
285 | else if (s->parameters_proc_swaps.what) |
286 | s->what = strdup(s->parameters_proc_swaps.what); | |
7410616c LP |
287 | else { |
288 | r = unit_name_to_path(u->id, &s->what); | |
289 | if (r < 0) | |
290 | return r; | |
291 | } | |
4e85aff4 LP |
292 | |
293 | if (!s->what) | |
07b0b134 | 294 | return -ENOMEM; |
4e85aff4 | 295 | } |
07b0b134 ML |
296 | |
297 | path_kill_slashes(s->what); | |
298 | ||
5bcb0f2b LP |
299 | if (!UNIT(s)->description) { |
300 | r = unit_set_description(u, s->what); | |
301 | if (r < 0) | |
4e85aff4 | 302 | return r; |
5bcb0f2b | 303 | } |
4e85aff4 | 304 | |
a57f7e2c | 305 | r = unit_require_mounts_for(UNIT(s), s->what); |
646134dc | 306 | if (r < 0) |
07b0b134 ML |
307 | return r; |
308 | ||
a57f7e2c | 309 | r = swap_add_device_links(s); |
646134dc | 310 | if (r < 0) |
6e2ef85b | 311 | return r; |
07b0b134 | 312 | |
9670d583 LP |
313 | r = swap_load_devnode(s); |
314 | if (r < 0) | |
315 | return r; | |
316 | ||
598459ce LP |
317 | r = unit_patch_contexts(u); |
318 | if (r < 0) | |
319 | return r; | |
320 | ||
321 | r = unit_add_exec_dependencies(u, &s->exec_context); | |
322 | if (r < 0) | |
323 | return r; | |
324 | ||
d79200e2 | 325 | r = unit_set_default_slice(u); |
a016b922 LP |
326 | if (r < 0) |
327 | return r; | |
328 | ||
646134dc ZJS |
329 | if (UNIT(s)->default_dependencies) { |
330 | r = swap_add_default_dependencies(s); | |
331 | if (r < 0) | |
2edd4434 | 332 | return r; |
646134dc | 333 | } |
07b0b134 ML |
334 | } |
335 | ||
336 | return swap_verify(s); | |
337 | } | |
338 | ||
628c89cc | 339 | static int swap_setup_unit( |
4e85aff4 LP |
340 | Manager *m, |
341 | const char *what, | |
e04aad61 | 342 | const char *what_proc_swaps, |
4e85aff4 | 343 | int priority, |
e04aad61 LP |
344 | bool set_flags) { |
345 | ||
7fd1b19b | 346 | _cleanup_free_ char *e = NULL; |
2c7c6144 | 347 | bool delete = false; |
5bcb0f2b | 348 | Unit *u = NULL; |
07b0b134 | 349 | int r; |
4e85aff4 LP |
350 | SwapParameters *p; |
351 | ||
352 | assert(m); | |
353 | assert(what); | |
6b1dc2bd | 354 | assert(what_proc_swaps); |
07b0b134 | 355 | |
7410616c LP |
356 | r = unit_name_from_path(what, ".swap", &e); |
357 | if (r < 0) | |
f2341e0a | 358 | return log_unit_error_errno(u, r, "Failed to generate unit name from path: %m"); |
07b0b134 | 359 | |
e04aad61 LP |
360 | u = manager_get_unit(m, e); |
361 | ||
6b1dc2bd | 362 | if (u && |
e04aad61 | 363 | SWAP(u)->from_proc_swaps && |
628c89cc LP |
364 | !path_equal(SWAP(u)->parameters_proc_swaps.what, what_proc_swaps)) { |
365 | log_error("Swap %s appeared twice with different device paths %s and %s", e, SWAP(u)->parameters_proc_swaps.what, what_proc_swaps); | |
e04aad61 | 366 | return -EEXIST; |
628c89cc | 367 | } |
4e85aff4 LP |
368 | |
369 | if (!u) { | |
07b0b134 ML |
370 | delete = true; |
371 | ||
7d17cfbc | 372 | u = unit_new(m, sizeof(Swap)); |
170ca19e ZJS |
373 | if (!u) |
374 | return log_oom(); | |
e04aad61 | 375 | |
7d17cfbc MS |
376 | r = unit_add_name(u, e); |
377 | if (r < 0) | |
e04aad61 LP |
378 | goto fail; |
379 | ||
7d17cfbc MS |
380 | SWAP(u)->what = strdup(what); |
381 | if (!SWAP(u)->what) { | |
628c89cc | 382 | r = -ENOMEM; |
e04aad61 LP |
383 | goto fail; |
384 | } | |
385 | ||
386 | unit_add_to_load_queue(u); | |
4e85aff4 LP |
387 | } else |
388 | delete = false; | |
07b0b134 | 389 | |
6b1dc2bd | 390 | p = &SWAP(u)->parameters_proc_swaps; |
07b0b134 | 391 | |
6b1dc2bd | 392 | if (!p->what) { |
5bcb0f2b LP |
393 | p->what = strdup(what_proc_swaps); |
394 | if (!p->what) { | |
395 | r = -ENOMEM; | |
6b1dc2bd LP |
396 | goto fail; |
397 | } | |
6b1dc2bd | 398 | } |
e04aad61 | 399 | |
6b1dc2bd LP |
400 | if (set_flags) { |
401 | SWAP(u)->is_active = true; | |
402 | SWAP(u)->just_activated = !SWAP(u)->from_proc_swaps; | |
4e85aff4 | 403 | } |
07b0b134 | 404 | |
6b1dc2bd LP |
405 | SWAP(u)->from_proc_swaps = true; |
406 | ||
4e85aff4 | 407 | p->priority = priority; |
07b0b134 | 408 | |
4e85aff4 | 409 | unit_add_to_dbus_queue(u); |
07b0b134 ML |
410 | return 0; |
411 | ||
412 | fail: | |
f2341e0a | 413 | log_unit_warning_errno(u, 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 | ||
628c89cc | 421 | static int swap_process_new(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 | ||
628c89cc | 430 | r = swap_setup_unit(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)) | |
628c89cc | 446 | swap_setup_unit(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 | |
628c89cc | 467 | swap_setup_unit(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; | |
37cf8fee | 475 | Swap *other; |
e04aad61 | 476 | |
07b0b134 ML |
477 | assert(s); |
478 | ||
479 | old_state = s->state; | |
480 | s->state = state; | |
481 | ||
e04aad61 LP |
482 | if (state != SWAP_ACTIVATING && |
483 | state != SWAP_ACTIVATING_SIGTERM && | |
484 | state != SWAP_ACTIVATING_SIGKILL && | |
5bcb0f2b | 485 | state != SWAP_ACTIVATING_DONE && |
e04aad61 LP |
486 | state != SWAP_DEACTIVATING && |
487 | state != SWAP_DEACTIVATING_SIGTERM && | |
488 | state != SWAP_DEACTIVATING_SIGKILL) { | |
718db961 | 489 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
e04aad61 LP |
490 | swap_unwatch_control_pid(s); |
491 | s->control_command = NULL; | |
492 | s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; | |
493 | } | |
494 | ||
07b0b134 | 495 | if (state != old_state) |
f2341e0a | 496 | log_unit_debug(UNIT(s), "Changed %s -> %s", swap_state_to_string(old_state), swap_state_to_string(state)); |
07b0b134 | 497 | |
5bcb0f2b | 498 | unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], true); |
37cf8fee LP |
499 | |
500 | /* If there other units for the same device node have a job | |
501 | queued it might be worth checking again if it is runnable | |
502 | now. This is necessary, since swap_start() refuses | |
503 | operation with EAGAIN if there's already another job for | |
504 | the same device node queued. */ | |
505 | LIST_FOREACH_OTHERS(same_devnode, other, s) | |
506 | if (UNIT(other)->job) | |
507 | job_add_to_run_queue(UNIT(other)->job); | |
07b0b134 ML |
508 | } |
509 | ||
be847e82 | 510 | static int swap_coldplug(Unit *u) { |
07b0b134 ML |
511 | Swap *s = SWAP(u); |
512 | SwapState new_state = SWAP_DEAD; | |
e04aad61 | 513 | int r; |
07b0b134 ML |
514 | |
515 | assert(s); | |
516 | assert(s->state == SWAP_DEAD); | |
517 | ||
518 | if (s->deserialized_state != s->state) | |
519 | new_state = s->deserialized_state; | |
4e85aff4 | 520 | else if (s->from_proc_swaps) |
07b0b134 ML |
521 | new_state = SWAP_ACTIVE; |
522 | ||
5bcb0f2b LP |
523 | if (new_state == s->state) |
524 | return 0; | |
e04aad61 | 525 | |
5bcb0f2b LP |
526 | if (new_state == SWAP_ACTIVATING || |
527 | new_state == SWAP_ACTIVATING_SIGTERM || | |
528 | new_state == SWAP_ACTIVATING_SIGKILL || | |
529 | new_state == SWAP_ACTIVATING_DONE || | |
530 | new_state == SWAP_DEACTIVATING || | |
531 | new_state == SWAP_DEACTIVATING_SIGTERM || | |
532 | new_state == SWAP_DEACTIVATING_SIGKILL) { | |
e04aad61 | 533 | |
5bcb0f2b LP |
534 | if (s->control_pid <= 0) |
535 | return -EBADMSG; | |
e04aad61 | 536 | |
5bcb0f2b LP |
537 | r = unit_watch_pid(UNIT(s), s->control_pid); |
538 | if (r < 0) | |
539 | return r; | |
e04aad61 | 540 | |
5bcb0f2b LP |
541 | r = swap_arm_timer(s); |
542 | if (r < 0) | |
543 | return r; | |
e04aad61 | 544 | } |
07b0b134 | 545 | |
5bcb0f2b | 546 | swap_set_state(s, new_state); |
07b0b134 ML |
547 | return 0; |
548 | } | |
549 | ||
550 | static void swap_dump(Unit *u, FILE *f, const char *prefix) { | |
551 | Swap *s = SWAP(u); | |
4e85aff4 | 552 | SwapParameters *p; |
07b0b134 ML |
553 | |
554 | assert(s); | |
4e85aff4 LP |
555 | assert(f); |
556 | ||
557 | if (s->from_proc_swaps) | |
558 | p = &s->parameters_proc_swaps; | |
559 | else if (s->from_fragment) | |
560 | p = &s->parameters_fragment; | |
b6bfc7bb LP |
561 | else |
562 | p = NULL; | |
07b0b134 ML |
563 | |
564 | fprintf(f, | |
4e85aff4 | 565 | "%sSwap State: %s\n" |
e1770af8 | 566 | "%sResult: %s\n" |
07b0b134 | 567 | "%sWhat: %s\n" |
4e85aff4 LP |
568 | "%sFrom /proc/swaps: %s\n" |
569 | "%sFrom fragment: %s\n", | |
07b0b134 | 570 | prefix, swap_state_to_string(s->state), |
e1770af8 | 571 | prefix, swap_result_to_string(s->result), |
07b0b134 | 572 | prefix, s->what, |
4e85aff4 LP |
573 | prefix, yes_no(s->from_proc_swaps), |
574 | prefix, yes_no(s->from_fragment)); | |
e04aad61 | 575 | |
9670d583 LP |
576 | if (s->devnode) |
577 | fprintf(f, "%sDevice Node: %s\n", prefix, s->devnode); | |
578 | ||
b6bfc7bb LP |
579 | if (p) |
580 | fprintf(f, | |
581 | "%sPriority: %i\n" | |
47cb901e | 582 | "%sOptions: %s\n", |
b6bfc7bb | 583 | prefix, p->priority, |
47cb901e | 584 | prefix, strempty(p->options)); |
b6bfc7bb | 585 | |
e04aad61 LP |
586 | if (s->control_pid > 0) |
587 | fprintf(f, | |
de0671ee ZJS |
588 | "%sControl PID: "PID_FMT"\n", |
589 | prefix, s->control_pid); | |
e04aad61 LP |
590 | |
591 | exec_context_dump(&s->exec_context, f, prefix); | |
4819ff03 | 592 | kill_context_dump(&s->kill_context, f, prefix); |
e04aad61 LP |
593 | } |
594 | ||
595 | static int swap_spawn(Swap *s, ExecCommand *c, pid_t *_pid) { | |
596 | pid_t pid; | |
597 | int r; | |
9fa95f85 DM |
598 | ExecParameters exec_params = { |
599 | .apply_permissions = true, | |
600 | .apply_chroot = true, | |
601 | .apply_tty_stdin = true, | |
6f856a09 | 602 | .bus_endpoint_fd = -1, |
a34ceba6 LP |
603 | .stdin_fd = -1, |
604 | .stdout_fd = -1, | |
605 | .stderr_fd = -1, | |
9fa95f85 | 606 | }; |
e04aad61 LP |
607 | |
608 | assert(s); | |
609 | assert(c); | |
610 | assert(_pid); | |
611 | ||
5ad096b3 LP |
612 | (void) unit_realize_cgroup(UNIT(s)); |
613 | if (s->reset_cpu_usage) { | |
614 | (void) unit_reset_cpu_usage(UNIT(s)); | |
615 | s->reset_cpu_usage = false; | |
616 | } | |
4ad49000 | 617 | |
613b411c LP |
618 | r = unit_setup_exec_runtime(UNIT(s)); |
619 | if (r < 0) | |
620 | goto fail; | |
621 | ||
718db961 | 622 | r = swap_arm_timer(s); |
646134dc | 623 | if (r < 0) |
e04aad61 LP |
624 | goto fail; |
625 | ||
9fa95f85 DM |
626 | exec_params.environment = UNIT(s)->manager->environment; |
627 | exec_params.confirm_spawn = UNIT(s)->manager->confirm_spawn; | |
628 | exec_params.cgroup_supported = UNIT(s)->manager->cgroup_supported; | |
629 | exec_params.cgroup_path = UNIT(s)->cgroup_path; | |
a931ad47 | 630 | exec_params.cgroup_delegate = s->cgroup_context.delegate; |
9fa95f85 | 631 | exec_params.runtime_prefix = manager_get_runtime_prefix(UNIT(s)->manager); |
9fa95f85 | 632 | |
f2341e0a LP |
633 | r = exec_spawn(UNIT(s), |
634 | c, | |
646134dc | 635 | &s->exec_context, |
9fa95f85 | 636 | &exec_params, |
613b411c | 637 | s->exec_runtime, |
646134dc ZJS |
638 | &pid); |
639 | if (r < 0) | |
e04aad61 LP |
640 | goto fail; |
641 | ||
646134dc ZJS |
642 | r = unit_watch_pid(UNIT(s), pid); |
643 | if (r < 0) | |
e04aad61 LP |
644 | /* FIXME: we need to do something here */ |
645 | goto fail; | |
646 | ||
647 | *_pid = pid; | |
648 | ||
649 | return 0; | |
650 | ||
651 | fail: | |
718db961 | 652 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
e04aad61 | 653 | return r; |
07b0b134 ML |
654 | } |
655 | ||
e1770af8 | 656 | static void swap_enter_dead(Swap *s, SwapResult f) { |
07b0b134 ML |
657 | assert(s); |
658 | ||
e1770af8 LP |
659 | if (f != SWAP_SUCCESS) |
660 | s->result = f; | |
e04aad61 | 661 | |
613b411c LP |
662 | exec_runtime_destroy(s->exec_runtime); |
663 | s->exec_runtime = exec_runtime_unref(s->exec_runtime); | |
664 | ||
e66cf1a3 LP |
665 | exec_context_destroy_runtime_directory(&s->exec_context, manager_get_runtime_prefix(UNIT(s)->manager)); |
666 | ||
e1770af8 | 667 | swap_set_state(s, s->result != SWAP_SUCCESS ? SWAP_FAILED : SWAP_DEAD); |
07b0b134 ML |
668 | } |
669 | ||
e1770af8 | 670 | static void swap_enter_active(Swap *s, SwapResult f) { |
e04aad61 LP |
671 | assert(s); |
672 | ||
e1770af8 LP |
673 | if (f != SWAP_SUCCESS) |
674 | s->result = f; | |
e04aad61 LP |
675 | |
676 | swap_set_state(s, SWAP_ACTIVE); | |
677 | } | |
678 | ||
e1770af8 | 679 | static void swap_enter_signal(Swap *s, SwapState state, SwapResult f) { |
07b0b134 ML |
680 | int r; |
681 | ||
682 | assert(s); | |
e04aad61 | 683 | |
e1770af8 LP |
684 | if (f != SWAP_SUCCESS) |
685 | s->result = f; | |
e04aad61 | 686 | |
cd2086fe LP |
687 | r = unit_kill_context( |
688 | UNIT(s), | |
689 | &s->kill_context, | |
db2cb23b UTL |
690 | (state != SWAP_ACTIVATING_SIGTERM && state != SWAP_DEACTIVATING_SIGTERM) ? |
691 | KILL_KILL : KILL_TERMINATE, | |
cd2086fe LP |
692 | -1, |
693 | s->control_pid, | |
694 | false); | |
695 | if (r < 0) | |
696 | goto fail; | |
e04aad61 | 697 | |
cd2086fe | 698 | if (r > 0) { |
718db961 | 699 | r = swap_arm_timer(s); |
646134dc | 700 | if (r < 0) |
e04aad61 LP |
701 | goto fail; |
702 | ||
703 | swap_set_state(s, state); | |
ac84d1fb LP |
704 | } else if (state == SWAP_ACTIVATING_SIGTERM) |
705 | swap_enter_signal(s, SWAP_ACTIVATING_SIGKILL, SWAP_SUCCESS); | |
706 | else if (state == SWAP_DEACTIVATING_SIGTERM) | |
707 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, SWAP_SUCCESS); | |
708 | else | |
e1770af8 | 709 | swap_enter_dead(s, SWAP_SUCCESS); |
e04aad61 LP |
710 | |
711 | return; | |
712 | ||
713 | fail: | |
f2341e0a | 714 | log_unit_warning_errno(UNIT(s), r, "Failed to kill processes: %m"); |
e1770af8 | 715 | swap_enter_dead(s, SWAP_FAILURE_RESOURCES); |
e04aad61 LP |
716 | } |
717 | ||
718 | static void swap_enter_activating(Swap *s) { | |
bf1d7ba7 KZ |
719 | _cleanup_free_ char *opts = NULL; |
720 | int r; | |
e04aad61 LP |
721 | |
722 | assert(s); | |
723 | ||
724 | s->control_command_id = SWAP_EXEC_ACTIVATE; | |
725 | s->control_command = s->exec_command + SWAP_EXEC_ACTIVATE; | |
07b0b134 | 726 | |
86b23b07 | 727 | if (s->from_fragment) { |
bf1d7ba7 | 728 | int priority = -1; |
47cb901e | 729 | |
bf1d7ba7 KZ |
730 | r = fstab_find_pri(s->parameters_fragment.options, &priority); |
731 | if (r < 0) | |
732 | log_warning_errno(r, "Failed to parse swap priority \"%s\", ignoring: %m", s->parameters_fragment.options); | |
733 | else if (r == 1 && s->parameters_fragment.priority >= 0) | |
734 | log_warning("Duplicate swap priority configuration by Priority and Options fields."); | |
735 | ||
736 | if (r <= 0 && s->parameters_fragment.priority >= 0) { | |
737 | if (s->parameters_fragment.options) | |
738 | r = asprintf(&opts, "%s,pri=%i", s->parameters_fragment.options, s->parameters_fragment.priority); | |
739 | else | |
740 | r = asprintf(&opts, "pri=%i", s->parameters_fragment.priority); | |
e64d5235 | 741 | if (r < 0) |
bf1d7ba7 | 742 | goto fail; |
e64d5235 | 743 | } |
86b23b07 JS |
744 | } |
745 | ||
746 | r = exec_command_set(s->control_command, "/sbin/swapon", NULL); | |
747 | if (r < 0) | |
748 | goto fail; | |
4e85aff4 | 749 | |
bf1d7ba7 KZ |
750 | if (s->parameters_fragment.options || opts) { |
751 | r = exec_command_append(s->control_command, "-o", | |
752 | opts ? : s->parameters_fragment.options, NULL); | |
86b23b07 JS |
753 | if (r < 0) |
754 | goto fail; | |
755 | } | |
e04aad61 | 756 | |
86b23b07 | 757 | r = exec_command_append(s->control_command, s->what, NULL); |
e04aad61 LP |
758 | if (r < 0) |
759 | goto fail; | |
760 | ||
761 | swap_unwatch_control_pid(s); | |
762 | ||
646134dc ZJS |
763 | r = swap_spawn(s, s->control_command, &s->control_pid); |
764 | if (r < 0) | |
e04aad61 LP |
765 | goto fail; |
766 | ||
767 | swap_set_state(s, SWAP_ACTIVATING); | |
768 | ||
769 | return; | |
770 | ||
771 | fail: | |
f2341e0a | 772 | log_unit_warning_errno(UNIT(s), r, "Failed to run 'swapon' task: %m"); |
e1770af8 | 773 | swap_enter_dead(s, SWAP_FAILURE_RESOURCES); |
e04aad61 LP |
774 | } |
775 | ||
e1770af8 | 776 | static void swap_enter_deactivating(Swap *s) { |
e04aad61 LP |
777 | int r; |
778 | ||
779 | assert(s); | |
780 | ||
e04aad61 LP |
781 | s->control_command_id = SWAP_EXEC_DEACTIVATE; |
782 | s->control_command = s->exec_command + SWAP_EXEC_DEACTIVATE; | |
783 | ||
646134dc | 784 | r = exec_command_set(s->control_command, |
e04aad61 LP |
785 | "/sbin/swapoff", |
786 | s->what, | |
646134dc ZJS |
787 | NULL); |
788 | if (r < 0) | |
e04aad61 LP |
789 | goto fail; |
790 | ||
791 | swap_unwatch_control_pid(s); | |
792 | ||
646134dc ZJS |
793 | r = swap_spawn(s, s->control_command, &s->control_pid); |
794 | if (r < 0) | |
e04aad61 LP |
795 | goto fail; |
796 | ||
797 | swap_set_state(s, SWAP_DEACTIVATING); | |
798 | ||
799 | return; | |
800 | ||
801 | fail: | |
f2341e0a | 802 | log_unit_warning_errno(UNIT(s), r, "Failed to run 'swapoff' task: %m"); |
e1770af8 | 803 | swap_enter_active(s, SWAP_FAILURE_RESOURCES); |
e04aad61 LP |
804 | } |
805 | ||
806 | static int swap_start(Unit *u) { | |
37cf8fee | 807 | Swap *s = SWAP(u), *other; |
e04aad61 LP |
808 | |
809 | assert(s); | |
810 | ||
811 | /* We cannot fulfill this request right now, try again later | |
812 | * please! */ | |
813 | ||
814 | if (s->state == SWAP_DEACTIVATING || | |
815 | s->state == SWAP_DEACTIVATING_SIGTERM || | |
816 | s->state == SWAP_DEACTIVATING_SIGKILL || | |
817 | s->state == SWAP_ACTIVATING_SIGTERM || | |
818 | s->state == SWAP_ACTIVATING_SIGKILL) | |
819 | return -EAGAIN; | |
820 | ||
821 | if (s->state == SWAP_ACTIVATING) | |
822 | return 0; | |
823 | ||
824 | assert(s->state == SWAP_DEAD || s->state == SWAP_FAILED); | |
825 | ||
75f86906 | 826 | if (detect_container() > 0) |
a5c3034f LP |
827 | return -EPERM; |
828 | ||
37cf8fee LP |
829 | /* If there's a job for another swap unit for the same node |
830 | * running, then let's not dispatch this one for now, and wait | |
831 | * until that other job has finished. */ | |
832 | LIST_FOREACH_OTHERS(same_devnode, other, s) | |
833 | if (UNIT(other)->job && UNIT(other)->job->state == JOB_RUNNING) | |
834 | return -EAGAIN; | |
835 | ||
e1770af8 | 836 | s->result = SWAP_SUCCESS; |
5ad096b3 LP |
837 | s->reset_cpu_usage = true; |
838 | ||
e04aad61 | 839 | swap_enter_activating(s); |
82a2b6bb | 840 | return 1; |
07b0b134 ML |
841 | } |
842 | ||
843 | static int swap_stop(Unit *u) { | |
844 | Swap *s = SWAP(u); | |
07b0b134 ML |
845 | |
846 | assert(s); | |
847 | ||
e04aad61 LP |
848 | if (s->state == SWAP_DEACTIVATING || |
849 | s->state == SWAP_DEACTIVATING_SIGTERM || | |
850 | s->state == SWAP_DEACTIVATING_SIGKILL || | |
851 | s->state == SWAP_ACTIVATING_SIGTERM || | |
852 | s->state == SWAP_ACTIVATING_SIGKILL) | |
853 | return 0; | |
07b0b134 | 854 | |
e04aad61 | 855 | assert(s->state == SWAP_ACTIVATING || |
5bcb0f2b | 856 | s->state == SWAP_ACTIVATING_DONE || |
e04aad61 | 857 | s->state == SWAP_ACTIVE); |
07b0b134 | 858 | |
75f86906 | 859 | if (detect_container() > 0) |
a5c3034f LP |
860 | return -EPERM; |
861 | ||
e1770af8 | 862 | swap_enter_deactivating(s); |
82a2b6bb | 863 | return 1; |
07b0b134 ML |
864 | } |
865 | ||
866 | static int swap_serialize(Unit *u, FILE *f, FDSet *fds) { | |
867 | Swap *s = SWAP(u); | |
868 | ||
869 | assert(s); | |
870 | assert(f); | |
871 | assert(fds); | |
872 | ||
873 | unit_serialize_item(u, f, "state", swap_state_to_string(s->state)); | |
e1770af8 | 874 | unit_serialize_item(u, f, "result", swap_result_to_string(s->result)); |
e04aad61 LP |
875 | |
876 | if (s->control_pid > 0) | |
de0671ee | 877 | unit_serialize_item_format(u, f, "control-pid", PID_FMT, s->control_pid); |
e04aad61 LP |
878 | |
879 | if (s->control_command_id >= 0) | |
880 | unit_serialize_item(u, f, "control-command", swap_exec_command_to_string(s->control_command_id)); | |
07b0b134 ML |
881 | |
882 | return 0; | |
883 | } | |
884 | ||
885 | static int swap_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
886 | Swap *s = SWAP(u); | |
887 | ||
888 | assert(s); | |
889 | assert(fds); | |
890 | ||
891 | if (streq(key, "state")) { | |
892 | SwapState state; | |
893 | ||
646134dc ZJS |
894 | state = swap_state_from_string(value); |
895 | if (state < 0) | |
f2341e0a | 896 | log_unit_debug(u, "Failed to parse state value: %s", value); |
07b0b134 ML |
897 | else |
898 | s->deserialized_state = state; | |
e1770af8 LP |
899 | } else if (streq(key, "result")) { |
900 | SwapResult f; | |
901 | ||
902 | f = swap_result_from_string(value); | |
903 | if (f < 0) | |
f2341e0a | 904 | log_unit_debug(u, "Failed to parse result value: %s", value); |
e1770af8 LP |
905 | else if (f != SWAP_SUCCESS) |
906 | s->result = f; | |
e04aad61 LP |
907 | } else if (streq(key, "control-pid")) { |
908 | pid_t pid; | |
909 | ||
910 | if (parse_pid(value, &pid) < 0) | |
f2341e0a | 911 | log_unit_debug(u, "Failed to parse control-pid value: %s", value); |
e04aad61 LP |
912 | else |
913 | s->control_pid = pid; | |
914 | ||
915 | } else if (streq(key, "control-command")) { | |
916 | SwapExecCommand id; | |
917 | ||
646134dc ZJS |
918 | id = swap_exec_command_from_string(value); |
919 | if (id < 0) | |
f2341e0a | 920 | log_unit_debug(u, "Failed to parse exec-command value: %s", value); |
e04aad61 LP |
921 | else { |
922 | s->control_command_id = id; | |
923 | s->control_command = s->exec_command + id; | |
924 | } | |
07b0b134 | 925 | } else |
f2341e0a | 926 | log_unit_debug(u, "Unknown serialization key: %s", key); |
07b0b134 ML |
927 | |
928 | return 0; | |
929 | } | |
930 | ||
44a6b1b6 | 931 | _pure_ static UnitActiveState swap_active_state(Unit *u) { |
07b0b134 ML |
932 | assert(u); |
933 | ||
934 | return state_translation_table[SWAP(u)->state]; | |
935 | } | |
936 | ||
44a6b1b6 | 937 | _pure_ static const char *swap_sub_state_to_string(Unit *u) { |
07b0b134 ML |
938 | assert(u); |
939 | ||
940 | return swap_state_to_string(SWAP(u)->state); | |
941 | } | |
942 | ||
44a6b1b6 | 943 | _pure_ static bool swap_check_gc(Unit *u) { |
07b0b134 ML |
944 | Swap *s = SWAP(u); |
945 | ||
946 | assert(s); | |
947 | ||
6b1dc2bd | 948 | return s->from_proc_swaps; |
07b0b134 ML |
949 | } |
950 | ||
e04aad61 LP |
951 | static void swap_sigchld_event(Unit *u, pid_t pid, int code, int status) { |
952 | Swap *s = SWAP(u); | |
e1770af8 | 953 | SwapResult f; |
e04aad61 LP |
954 | |
955 | assert(s); | |
956 | assert(pid >= 0); | |
957 | ||
958 | if (pid != s->control_pid) | |
959 | return; | |
960 | ||
961 | s->control_pid = 0; | |
962 | ||
96342de6 | 963 | if (is_clean_exit(code, status, NULL)) |
e1770af8 LP |
964 | f = SWAP_SUCCESS; |
965 | else if (code == CLD_EXITED) | |
966 | f = SWAP_FAILURE_EXIT_CODE; | |
967 | else if (code == CLD_KILLED) | |
968 | f = SWAP_FAILURE_SIGNAL; | |
969 | else if (code == CLD_DUMPED) | |
970 | f = SWAP_FAILURE_CORE_DUMP; | |
971 | else | |
972 | assert_not_reached("Unknown code"); | |
973 | ||
974 | if (f != SWAP_SUCCESS) | |
975 | s->result = f; | |
e04aad61 LP |
976 | |
977 | if (s->control_command) { | |
6ea832a2 | 978 | exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status); |
e1770af8 | 979 | |
e04aad61 LP |
980 | s->control_command = NULL; |
981 | s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; | |
982 | } | |
983 | ||
f2341e0a LP |
984 | log_unit_full(u, f == SWAP_SUCCESS ? LOG_DEBUG : LOG_NOTICE, 0, |
985 | "Swap process exited, code=%s status=%i", sigchld_code_to_string(code), status); | |
e04aad61 LP |
986 | |
987 | switch (s->state) { | |
988 | ||
989 | case SWAP_ACTIVATING: | |
5bcb0f2b | 990 | case SWAP_ACTIVATING_DONE: |
e04aad61 LP |
991 | case SWAP_ACTIVATING_SIGTERM: |
992 | case SWAP_ACTIVATING_SIGKILL: | |
993 | ||
e1770af8 LP |
994 | if (f == SWAP_SUCCESS) |
995 | swap_enter_active(s, f); | |
e04aad61 | 996 | else |
e1770af8 | 997 | swap_enter_dead(s, f); |
e04aad61 LP |
998 | break; |
999 | ||
1000 | case SWAP_DEACTIVATING: | |
1001 | case SWAP_DEACTIVATING_SIGKILL: | |
1002 | case SWAP_DEACTIVATING_SIGTERM: | |
1003 | ||
7bb01eff | 1004 | swap_enter_dead(s, f); |
e04aad61 LP |
1005 | break; |
1006 | ||
1007 | default: | |
1008 | assert_not_reached("Uh, control process died at wrong time."); | |
1009 | } | |
1010 | ||
1011 | /* Notify clients about changed exit status */ | |
1012 | unit_add_to_dbus_queue(u); | |
e04aad61 LP |
1013 | } |
1014 | ||
718db961 LP |
1015 | static int swap_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) { |
1016 | Swap *s = SWAP(userdata); | |
e04aad61 LP |
1017 | |
1018 | assert(s); | |
718db961 | 1019 | assert(s->timer_event_source == source); |
e04aad61 LP |
1020 | |
1021 | switch (s->state) { | |
1022 | ||
1023 | case SWAP_ACTIVATING: | |
5bcb0f2b | 1024 | case SWAP_ACTIVATING_DONE: |
f2341e0a | 1025 | log_unit_warning(UNIT(s), "Activation timed out. Stopping."); |
e1770af8 | 1026 | swap_enter_signal(s, SWAP_ACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT); |
e04aad61 LP |
1027 | break; |
1028 | ||
1029 | case SWAP_DEACTIVATING: | |
f2341e0a | 1030 | log_unit_warning(UNIT(s), "Deactivation timed out. Stopping."); |
e1770af8 | 1031 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT); |
e04aad61 LP |
1032 | break; |
1033 | ||
1034 | case SWAP_ACTIVATING_SIGTERM: | |
4819ff03 | 1035 | if (s->kill_context.send_sigkill) { |
f2341e0a | 1036 | log_unit_warning(UNIT(s), "Activation timed out. Killing."); |
e1770af8 | 1037 | swap_enter_signal(s, SWAP_ACTIVATING_SIGKILL, SWAP_FAILURE_TIMEOUT); |
ba035df2 | 1038 | } else { |
f2341e0a | 1039 | log_unit_warning(UNIT(s), "Activation timed out. Skipping SIGKILL. Ignoring."); |
e1770af8 | 1040 | swap_enter_dead(s, SWAP_FAILURE_TIMEOUT); |
ba035df2 | 1041 | } |
e04aad61 LP |
1042 | break; |
1043 | ||
1044 | case SWAP_DEACTIVATING_SIGTERM: | |
4819ff03 | 1045 | if (s->kill_context.send_sigkill) { |
f2341e0a | 1046 | log_unit_warning(UNIT(s), "Deactivation timed out. Killing."); |
e1770af8 | 1047 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, SWAP_FAILURE_TIMEOUT); |
ba035df2 | 1048 | } else { |
f2341e0a | 1049 | log_unit_warning(UNIT(s), "Deactivation timed out. Skipping SIGKILL. Ignoring."); |
e1770af8 | 1050 | swap_enter_dead(s, SWAP_FAILURE_TIMEOUT); |
ba035df2 | 1051 | } |
e04aad61 LP |
1052 | break; |
1053 | ||
1054 | case SWAP_ACTIVATING_SIGKILL: | |
1055 | case SWAP_DEACTIVATING_SIGKILL: | |
f2341e0a | 1056 | log_unit_warning(UNIT(s), "Swap process still around after SIGKILL. Ignoring."); |
e1770af8 | 1057 | swap_enter_dead(s, SWAP_FAILURE_TIMEOUT); |
e04aad61 LP |
1058 | break; |
1059 | ||
1060 | default: | |
1061 | assert_not_reached("Timeout at wrong time."); | |
1062 | } | |
718db961 LP |
1063 | |
1064 | return 0; | |
e04aad61 LP |
1065 | } |
1066 | ||
1067 | static int swap_load_proc_swaps(Manager *m, bool set_flags) { | |
1068 | unsigned i; | |
1069 | int r = 0; | |
1070 | ||
1071 | assert(m); | |
1072 | ||
07b0b134 | 1073 | rewind(m->proc_swaps); |
bab45044 | 1074 | |
4e85aff4 | 1075 | (void) fscanf(m->proc_swaps, "%*s %*s %*s %*s %*s\n"); |
07b0b134 | 1076 | |
e04aad61 | 1077 | for (i = 1;; i++) { |
9fb3675e | 1078 | _cleanup_free_ char *dev = NULL, *d = NULL; |
07b0b134 ML |
1079 | int prio = 0, k; |
1080 | ||
646134dc ZJS |
1081 | k = fscanf(m->proc_swaps, |
1082 | "%ms " /* device/file */ | |
1083 | "%*s " /* type of swap */ | |
1084 | "%*s " /* swap size */ | |
1085 | "%*s " /* used */ | |
1086 | "%i\n", /* priority */ | |
1087 | &dev, &prio); | |
1088 | if (k != 2) { | |
07b0b134 | 1089 | if (k == EOF) |
4e85aff4 | 1090 | break; |
07b0b134 | 1091 | |
628c89cc | 1092 | log_warning("Failed to parse /proc/swaps:%u.", i); |
e04aad61 | 1093 | continue; |
07b0b134 | 1094 | } |
07b0b134 | 1095 | |
527b7a42 | 1096 | if (cunescape(dev, UNESCAPE_RELAX, &d) < 0) |
628c89cc LP |
1097 | return log_oom(); |
1098 | ||
1099 | device_found_node(m, d, true, DEVICE_FOUND_SWAP, set_flags); | |
4e85aff4 | 1100 | |
628c89cc | 1101 | k = swap_process_new(m, d, prio, set_flags); |
07b0b134 | 1102 | if (k < 0) |
e04aad61 | 1103 | r = k; |
07b0b134 ML |
1104 | } |
1105 | ||
e04aad61 LP |
1106 | return r; |
1107 | } | |
1108 | ||
718db961 LP |
1109 | static int swap_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) { |
1110 | Manager *m = userdata; | |
595ed347 | 1111 | Unit *u; |
4e434314 LP |
1112 | int r; |
1113 | ||
1114 | assert(m); | |
718db961 | 1115 | assert(revents & EPOLLPRI); |
4e434314 | 1116 | |
646134dc ZJS |
1117 | r = swap_load_proc_swaps(m, true); |
1118 | if (r < 0) { | |
da927ba9 | 1119 | log_error_errno(r, "Failed to reread /proc/swaps: %m"); |
e04aad61 LP |
1120 | |
1121 | /* Reset flags, just in case, for late calls */ | |
595ed347 MS |
1122 | LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) { |
1123 | Swap *swap = SWAP(u); | |
e04aad61 LP |
1124 | |
1125 | swap->is_active = swap->just_activated = false; | |
1126 | } | |
1127 | ||
1128 | return 0; | |
1129 | } | |
1130 | ||
1131 | manager_dispatch_load_queue(m); | |
1132 | ||
595ed347 MS |
1133 | LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) { |
1134 | Swap *swap = SWAP(u); | |
e04aad61 LP |
1135 | |
1136 | if (!swap->is_active) { | |
1137 | /* This has just been deactivated */ | |
1138 | ||
e04aad61 LP |
1139 | swap_unset_proc_swaps(swap); |
1140 | ||
1141 | switch (swap->state) { | |
1142 | ||
1143 | case SWAP_ACTIVE: | |
e1770af8 | 1144 | swap_enter_dead(swap, SWAP_SUCCESS); |
e04aad61 LP |
1145 | break; |
1146 | ||
1147 | default: | |
5bcb0f2b | 1148 | /* Fire again */ |
e04aad61 LP |
1149 | swap_set_state(swap, swap->state); |
1150 | break; | |
1151 | } | |
1152 | ||
628c89cc LP |
1153 | if (swap->what) |
1154 | device_found_node(m, swap->what, false, DEVICE_FOUND_SWAP, true); | |
1155 | ||
e04aad61 LP |
1156 | } else if (swap->just_activated) { |
1157 | ||
1158 | /* New swap entry */ | |
1159 | ||
1160 | switch (swap->state) { | |
1161 | ||
1162 | case SWAP_DEAD: | |
1163 | case SWAP_FAILED: | |
e1770af8 | 1164 | swap_enter_active(swap, SWAP_SUCCESS); |
e04aad61 LP |
1165 | break; |
1166 | ||
5bcb0f2b LP |
1167 | case SWAP_ACTIVATING: |
1168 | swap_set_state(swap, SWAP_ACTIVATING_DONE); | |
1169 | break; | |
1170 | ||
e04aad61 LP |
1171 | default: |
1172 | /* Nothing really changed, but let's | |
1173 | * issue an notification call | |
1174 | * nonetheless, in case somebody is | |
1175 | * waiting for this. */ | |
1176 | swap_set_state(swap, swap->state); | |
1177 | break; | |
1178 | } | |
1179 | } | |
1180 | ||
1181 | /* Reset the flags for later calls */ | |
1182 | swap->is_active = swap->just_activated = false; | |
1183 | } | |
1184 | ||
1185 | return 1; | |
1186 | } | |
1187 | ||
1188 | static Unit *swap_following(Unit *u) { | |
1189 | Swap *s = SWAP(u); | |
1190 | Swap *other, *first = NULL; | |
1191 | ||
1192 | assert(s); | |
1193 | ||
cdc89820 ZJS |
1194 | /* If the user configured the swap through /etc/fstab or |
1195 | * a device unit, follow that. */ | |
1196 | ||
1197 | if (s->from_fragment) | |
e04aad61 LP |
1198 | return NULL; |
1199 | ||
caac2704 | 1200 | LIST_FOREACH_OTHERS(same_devnode, other, s) |
cdc89820 ZJS |
1201 | if (other->from_fragment) |
1202 | return UNIT(other); | |
1203 | ||
1204 | /* Otherwise make everybody follow the unit that's named after | |
1205 | * the swap device in the kernel */ | |
1206 | ||
1207 | if (streq_ptr(s->what, s->devnode)) | |
1208 | return NULL; | |
e04aad61 | 1209 | |
9670d583 LP |
1210 | LIST_FOREACH_AFTER(same_devnode, other, s) |
1211 | if (streq_ptr(other->what, other->devnode)) | |
e04aad61 LP |
1212 | return UNIT(other); |
1213 | ||
9670d583 LP |
1214 | LIST_FOREACH_BEFORE(same_devnode, other, s) { |
1215 | if (streq_ptr(other->what, other->devnode)) | |
e04aad61 LP |
1216 | return UNIT(other); |
1217 | ||
1218 | first = other; | |
1219 | } | |
1220 | ||
cdc89820 | 1221 | /* Fall back to the first on the list */ |
e04aad61 | 1222 | return UNIT(first); |
07b0b134 ML |
1223 | } |
1224 | ||
6210e7fc | 1225 | static int swap_following_set(Unit *u, Set **_set) { |
5bcb0f2b | 1226 | Swap *s = SWAP(u), *other; |
6210e7fc LP |
1227 | Set *set; |
1228 | int r; | |
1229 | ||
1230 | assert(s); | |
1231 | assert(_set); | |
1232 | ||
9670d583 | 1233 | if (LIST_JUST_US(same_devnode, s)) { |
6210e7fc LP |
1234 | *_set = NULL; |
1235 | return 0; | |
1236 | } | |
1237 | ||
d5099efc | 1238 | set = set_new(NULL); |
5bcb0f2b | 1239 | if (!set) |
6210e7fc LP |
1240 | return -ENOMEM; |
1241 | ||
caac2704 | 1242 | LIST_FOREACH_OTHERS(same_devnode, other, s) { |
5bcb0f2b LP |
1243 | r = set_put(set, other); |
1244 | if (r < 0) | |
6210e7fc | 1245 | goto fail; |
5bcb0f2b | 1246 | } |
6210e7fc LP |
1247 | |
1248 | *_set = set; | |
1249 | return 1; | |
1250 | ||
1251 | fail: | |
1252 | set_free(set); | |
1253 | return r; | |
1254 | } | |
1255 | ||
07b0b134 ML |
1256 | static void swap_shutdown(Manager *m) { |
1257 | assert(m); | |
1258 | ||
718db961 LP |
1259 | m->swap_event_source = sd_event_source_unref(m->swap_event_source); |
1260 | ||
74ca738f | 1261 | m->proc_swaps = safe_fclose(m->proc_swaps); |
e04aad61 | 1262 | |
525d3cc7 | 1263 | m->swaps_by_devnode = hashmap_free(m->swaps_by_devnode); |
07b0b134 ML |
1264 | } |
1265 | ||
07b0b134 ML |
1266 | static int swap_enumerate(Manager *m) { |
1267 | int r; | |
9670d583 | 1268 | |
07b0b134 ML |
1269 | assert(m); |
1270 | ||
4e434314 | 1271 | if (!m->proc_swaps) { |
646134dc ZJS |
1272 | m->proc_swaps = fopen("/proc/swaps", "re"); |
1273 | if (!m->proc_swaps) | |
718db961 | 1274 | return errno == ENOENT ? 0 : -errno; |
4e434314 | 1275 | |
151b9b96 | 1276 | r = sd_event_add_io(m->event, &m->swap_event_source, fileno(m->proc_swaps), EPOLLPRI, swap_dispatch_io, m); |
718db961 | 1277 | if (r < 0) |
29083707 LP |
1278 | goto fail; |
1279 | ||
1280 | /* Dispatch this before we dispatch SIGCHLD, so that | |
1281 | * we always get the events from /proc/swaps before | |
1282 | * the SIGCHLD of /sbin/swapon. */ | |
1283 | r = sd_event_source_set_priority(m->swap_event_source, -10); | |
1284 | if (r < 0) | |
718db961 | 1285 | goto fail; |
7dfbe2e3 TG |
1286 | |
1287 | (void) sd_event_source_set_description(m->swap_event_source, "swap-proc"); | |
4e434314 LP |
1288 | } |
1289 | ||
646134dc ZJS |
1290 | r = swap_load_proc_swaps(m, false); |
1291 | if (r < 0) | |
718db961 LP |
1292 | goto fail; |
1293 | ||
1294 | return 0; | |
07b0b134 | 1295 | |
718db961 LP |
1296 | fail: |
1297 | swap_shutdown(m); | |
07b0b134 ML |
1298 | return r; |
1299 | } | |
1300 | ||
628c89cc | 1301 | int swap_process_device_new(Manager *m, struct udev_device *dev) { |
9670d583 LP |
1302 | struct udev_list_entry *item = NULL, *first = NULL; |
1303 | _cleanup_free_ char *e = NULL; | |
1304 | const char *dn; | |
1305 | Swap *s; | |
1306 | int r = 0; | |
1307 | ||
1308 | assert(m); | |
1309 | assert(dev); | |
1310 | ||
1311 | dn = udev_device_get_devnode(dev); | |
1312 | if (!dn) | |
1313 | return 0; | |
1314 | ||
7410616c LP |
1315 | r = unit_name_from_path(dn, ".swap", &e); |
1316 | if (r < 0) | |
1317 | return r; | |
9670d583 LP |
1318 | |
1319 | s = hashmap_get(m->units, e); | |
1320 | if (s) | |
1321 | r = swap_set_devnode(s, dn); | |
1322 | ||
1323 | first = udev_device_get_devlinks_list_entry(dev); | |
1324 | udev_list_entry_foreach(item, first) { | |
1325 | _cleanup_free_ char *n = NULL; | |
7410616c | 1326 | int q; |
9670d583 | 1327 | |
7410616c LP |
1328 | q = unit_name_from_path(udev_list_entry_get_name(item), ".swap", &n); |
1329 | if (q < 0) | |
1330 | return q; | |
9670d583 LP |
1331 | |
1332 | s = hashmap_get(m->units, n); | |
1333 | if (s) { | |
9670d583 LP |
1334 | q = swap_set_devnode(s, dn); |
1335 | if (q < 0) | |
1336 | r = q; | |
1337 | } | |
1338 | } | |
1339 | ||
1340 | return r; | |
1341 | } | |
1342 | ||
628c89cc | 1343 | int swap_process_device_remove(Manager *m, struct udev_device *dev) { |
9670d583 LP |
1344 | const char *dn; |
1345 | int r = 0; | |
1346 | Swap *s; | |
1347 | ||
1348 | dn = udev_device_get_devnode(dev); | |
1349 | if (!dn) | |
1350 | return 0; | |
1351 | ||
1352 | while ((s = hashmap_get(m->swaps_by_devnode, dn))) { | |
1353 | int q; | |
1354 | ||
1355 | q = swap_set_devnode(s, NULL); | |
1356 | if (q < 0) | |
1357 | r = q; | |
1358 | } | |
1359 | ||
1360 | return r; | |
1361 | } | |
1362 | ||
fdf20a31 | 1363 | static void swap_reset_failed(Unit *u) { |
5632e374 LP |
1364 | Swap *s = SWAP(u); |
1365 | ||
1366 | assert(s); | |
1367 | ||
fdf20a31 | 1368 | if (s->state == SWAP_FAILED) |
5632e374 | 1369 | swap_set_state(s, SWAP_DEAD); |
e04aad61 | 1370 | |
e1770af8 | 1371 | s->result = SWAP_SUCCESS; |
5632e374 LP |
1372 | } |
1373 | ||
718db961 | 1374 | static int swap_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) { |
814cc562 | 1375 | return unit_kill_common(u, who, signo, -1, SWAP(u)->control_pid, error); |
8a0867d6 LP |
1376 | } |
1377 | ||
68db7a3b ZJS |
1378 | static int swap_get_timeout(Unit *u, uint64_t *timeout) { |
1379 | Swap *s = SWAP(u); | |
1380 | int r; | |
1381 | ||
1382 | if (!s->timer_event_source) | |
1383 | return 0; | |
1384 | ||
1385 | r = sd_event_source_get_time(s->timer_event_source, timeout); | |
1386 | if (r < 0) | |
1387 | return r; | |
1388 | ||
1389 | return 1; | |
1390 | } | |
1391 | ||
1c2e9646 | 1392 | static bool swap_supported(void) { |
0faacd47 LP |
1393 | static int supported = -1; |
1394 | ||
1395 | /* If swap support is not available in the kernel, or we are | |
1396 | * running in a container we don't support swap units, and any | |
1397 | * attempts to starting one should fail immediately. */ | |
1398 | ||
1399 | if (supported < 0) | |
1400 | supported = | |
1401 | access("/proc/swaps", F_OK) >= 0 && | |
75f86906 | 1402 | detect_container() <= 0; |
0faacd47 LP |
1403 | |
1404 | return supported; | |
1405 | } | |
1406 | ||
e04aad61 LP |
1407 | static const char* const swap_exec_command_table[_SWAP_EXEC_COMMAND_MAX] = { |
1408 | [SWAP_EXEC_ACTIVATE] = "ExecActivate", | |
1409 | [SWAP_EXEC_DEACTIVATE] = "ExecDeactivate", | |
1410 | }; | |
1411 | ||
1412 | DEFINE_STRING_TABLE_LOOKUP(swap_exec_command, SwapExecCommand); | |
1413 | ||
e1770af8 LP |
1414 | static const char* const swap_result_table[_SWAP_RESULT_MAX] = { |
1415 | [SWAP_SUCCESS] = "success", | |
1416 | [SWAP_FAILURE_RESOURCES] = "resources", | |
1417 | [SWAP_FAILURE_TIMEOUT] = "timeout", | |
1418 | [SWAP_FAILURE_EXIT_CODE] = "exit-code", | |
1419 | [SWAP_FAILURE_SIGNAL] = "signal", | |
1420 | [SWAP_FAILURE_CORE_DUMP] = "core-dump" | |
1421 | }; | |
1422 | ||
1423 | DEFINE_STRING_TABLE_LOOKUP(swap_result, SwapResult); | |
1424 | ||
07b0b134 | 1425 | const UnitVTable swap_vtable = { |
7d17cfbc | 1426 | .object_size = sizeof(Swap), |
718db961 LP |
1427 | .exec_context_offset = offsetof(Swap, exec_context), |
1428 | .cgroup_context_offset = offsetof(Swap, cgroup_context), | |
1429 | .kill_context_offset = offsetof(Swap, kill_context), | |
613b411c | 1430 | .exec_runtime_offset = offsetof(Swap, exec_runtime), |
3ef63c31 | 1431 | |
f975e971 LP |
1432 | .sections = |
1433 | "Unit\0" | |
1434 | "Swap\0" | |
1435 | "Install\0", | |
4ad49000 | 1436 | .private_section = "Swap", |
71645aca | 1437 | |
e04aad61 | 1438 | .no_alias = true, |
07b0b134 ML |
1439 | .no_instances = true, |
1440 | ||
4e85aff4 | 1441 | .init = swap_init, |
07b0b134 | 1442 | .load = swap_load, |
6e620bec | 1443 | .done = swap_done, |
07b0b134 ML |
1444 | |
1445 | .coldplug = swap_coldplug, | |
1446 | ||
1447 | .dump = swap_dump, | |
1448 | ||
1449 | .start = swap_start, | |
1450 | .stop = swap_stop, | |
1451 | ||
8a0867d6 LP |
1452 | .kill = swap_kill, |
1453 | ||
68db7a3b ZJS |
1454 | .get_timeout = swap_get_timeout, |
1455 | ||
07b0b134 ML |
1456 | .serialize = swap_serialize, |
1457 | .deserialize_item = swap_deserialize_item, | |
1458 | ||
1459 | .active_state = swap_active_state, | |
1460 | .sub_state_to_string = swap_sub_state_to_string, | |
1461 | ||
1462 | .check_gc = swap_check_gc, | |
1463 | ||
e04aad61 | 1464 | .sigchld_event = swap_sigchld_event, |
e04aad61 LP |
1465 | |
1466 | .reset_failed = swap_reset_failed, | |
1467 | ||
718db961 | 1468 | .bus_vtable = bus_swap_vtable, |
74c964d3 LP |
1469 | .bus_set_property = bus_swap_set_property, |
1470 | .bus_commit_properties = bus_swap_commit_properties, | |
07b0b134 | 1471 | |
e04aad61 | 1472 | .following = swap_following, |
6210e7fc | 1473 | .following_set = swap_following_set, |
5632e374 | 1474 | |
6e620bec | 1475 | .enumerate = swap_enumerate, |
c6918296 | 1476 | .shutdown = swap_shutdown, |
0faacd47 | 1477 | .supported = swap_supported, |
c6918296 MS |
1478 | |
1479 | .status_message_formats = { | |
1480 | .starting_stopping = { | |
1481 | [0] = "Activating swap %s...", | |
1482 | [1] = "Deactivating swap %s...", | |
1483 | }, | |
1484 | .finished_start_job = { | |
1485 | [JOB_DONE] = "Activated swap %s.", | |
1486 | [JOB_FAILED] = "Failed to activate swap %s.", | |
c6918296 MS |
1487 | [JOB_TIMEOUT] = "Timed out activating swap %s.", |
1488 | }, | |
1489 | .finished_stop_job = { | |
1490 | [JOB_DONE] = "Deactivated swap %s.", | |
1491 | [JOB_FAILED] = "Failed deactivating swap %s.", | |
1492 | [JOB_TIMEOUT] = "Timed out deactivating swap %s.", | |
1493 | }, | |
1494 | }, | |
07b0b134 | 1495 | }; |