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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 | ||
b5efdb8a | 29 | #include "alloc-util.h" |
07b0b134 | 30 | #include "dbus-swap.h" |
4f5dd394 | 31 | #include "escape.h" |
9a57c629 | 32 | #include "exit-status.h" |
3ffd4af2 | 33 | #include "fd-util.h" |
4f5dd394 LP |
34 | #include "formats-util.h" |
35 | #include "fstab-util.h" | |
6bedfcbb | 36 | #include "parse-util.h" |
9eb977db | 37 | #include "path-util.h" |
7b3e062c | 38 | #include "process-util.h" |
4f5dd394 | 39 | #include "special.h" |
8b43440b | 40 | #include "string-table.h" |
07630cea | 41 | #include "string-util.h" |
3ffd4af2 | 42 | #include "swap.h" |
5bcb0f2b | 43 | #include "udev-util.h" |
4f5dd394 LP |
44 | #include "unit-name.h" |
45 | #include "unit.h" | |
46 | #include "virt.h" | |
07b0b134 ML |
47 | |
48 | static const UnitActiveState state_translation_table[_SWAP_STATE_MAX] = { | |
49 | [SWAP_DEAD] = UNIT_INACTIVE, | |
e04aad61 | 50 | [SWAP_ACTIVATING] = UNIT_ACTIVATING, |
5bcb0f2b | 51 | [SWAP_ACTIVATING_DONE] = UNIT_ACTIVE, |
07b0b134 | 52 | [SWAP_ACTIVE] = UNIT_ACTIVE, |
e04aad61 LP |
53 | [SWAP_DEACTIVATING] = UNIT_DEACTIVATING, |
54 | [SWAP_ACTIVATING_SIGTERM] = UNIT_DEACTIVATING, | |
55 | [SWAP_ACTIVATING_SIGKILL] = UNIT_DEACTIVATING, | |
56 | [SWAP_DEACTIVATING_SIGTERM] = UNIT_DEACTIVATING, | |
57 | [SWAP_DEACTIVATING_SIGKILL] = UNIT_DEACTIVATING, | |
fdf20a31 | 58 | [SWAP_FAILED] = UNIT_FAILED |
07b0b134 ML |
59 | }; |
60 | ||
718db961 LP |
61 | static int swap_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata); |
62 | static int swap_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata); | |
63 | ||
e04aad61 | 64 | static void swap_unset_proc_swaps(Swap *s) { |
9670d583 LP |
65 | assert(s); |
66 | ||
67 | if (!s->from_proc_swaps) | |
68 | return; | |
69 | ||
a1e58e8e | 70 | s->parameters_proc_swaps.what = mfree(s->parameters_proc_swaps.what); |
9670d583 LP |
71 | |
72 | s->from_proc_swaps = false; | |
73 | } | |
74 | ||
75 | static int swap_set_devnode(Swap *s, const char *devnode) { | |
df326b84 | 76 | Hashmap *swaps; |
5bcb0f2b | 77 | Swap *first; |
9670d583 | 78 | int r; |
e04aad61 LP |
79 | |
80 | assert(s); | |
81 | ||
d5099efc | 82 | r = hashmap_ensure_allocated(&UNIT(s)->manager->swaps_by_devnode, &string_hash_ops); |
9670d583 LP |
83 | if (r < 0) |
84 | return r; | |
e04aad61 | 85 | |
9670d583 | 86 | swaps = UNIT(s)->manager->swaps_by_devnode; |
e04aad61 | 87 | |
9670d583 LP |
88 | if (s->devnode) { |
89 | first = hashmap_get(swaps, s->devnode); | |
e04aad61 | 90 | |
9670d583 LP |
91 | LIST_REMOVE(same_devnode, first, s); |
92 | if (first) | |
93 | hashmap_replace(swaps, first->devnode, first); | |
94 | else | |
95 | hashmap_remove(swaps, s->devnode); | |
5bcb0f2b | 96 | |
a1e58e8e | 97 | s->devnode = mfree(s->devnode); |
9670d583 LP |
98 | } |
99 | ||
100 | if (devnode) { | |
101 | s->devnode = strdup(devnode); | |
102 | if (!s->devnode) | |
103 | return -ENOMEM; | |
104 | ||
105 | first = hashmap_get(swaps, s->devnode); | |
106 | LIST_PREPEND(same_devnode, first, s); | |
107 | ||
108 | return hashmap_replace(swaps, first->devnode, first); | |
109 | } | |
110 | ||
111 | return 0; | |
e04aad61 LP |
112 | } |
113 | ||
f6cebb3b | 114 | static void swap_init(Unit *u) { |
6e620bec LP |
115 | Swap *s = SWAP(u); |
116 | ||
117 | assert(s); | |
1124fe6f | 118 | assert(UNIT(s)->load_state == UNIT_STUB); |
6e620bec | 119 | |
1f19a534 | 120 | s->timeout_usec = u->manager->default_timeout_start_usec; |
e04aad61 | 121 | |
ac155bb8 MS |
122 | s->exec_context.std_output = u->manager->default_std_output; |
123 | s->exec_context.std_error = u->manager->default_std_error; | |
085afe36 | 124 | |
6b1dc2bd | 125 | s->parameters_proc_swaps.priority = s->parameters_fragment.priority = -1; |
e04aad61 | 126 | |
e1770af8 | 127 | s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; |
c8f4d764 | 128 | |
5bcb0f2b | 129 | u->ignore_on_isolate = true; |
e04aad61 LP |
130 | } |
131 | ||
132 | static void swap_unwatch_control_pid(Swap *s) { | |
133 | assert(s); | |
134 | ||
135 | if (s->control_pid <= 0) | |
136 | return; | |
137 | ||
138 | unit_unwatch_pid(UNIT(s), s->control_pid); | |
139 | s->control_pid = 0; | |
6e620bec LP |
140 | } |
141 | ||
4e85aff4 LP |
142 | static void swap_done(Unit *u) { |
143 | Swap *s = SWAP(u); | |
07b0b134 | 144 | |
4e85aff4 | 145 | assert(s); |
07b0b134 | 146 | |
e04aad61 | 147 | swap_unset_proc_swaps(s); |
9670d583 | 148 | swap_set_devnode(s, NULL); |
e04aad61 | 149 | |
a1e58e8e LP |
150 | s->what = mfree(s->what); |
151 | s->parameters_fragment.what = mfree(s->parameters_fragment.what); | |
152 | s->parameters_fragment.options = mfree(s->parameters_fragment.options); | |
86b23b07 | 153 | |
613b411c | 154 | s->exec_runtime = exec_runtime_unref(s->exec_runtime); |
e04aad61 LP |
155 | exec_command_done_array(s->exec_command, _SWAP_EXEC_COMMAND_MAX); |
156 | s->control_command = NULL; | |
157 | ||
158 | swap_unwatch_control_pid(s); | |
159 | ||
718db961 LP |
160 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
161 | } | |
162 | ||
163 | static int swap_arm_timer(Swap *s) { | |
164 | int r; | |
165 | ||
166 | assert(s); | |
167 | ||
168 | if (s->timeout_usec <= 0) { | |
169 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); | |
170 | return 0; | |
171 | } | |
172 | ||
173 | if (s->timer_event_source) { | |
174 | r = sd_event_source_set_time(s->timer_event_source, now(CLOCK_MONOTONIC) + s->timeout_usec); | |
175 | if (r < 0) | |
176 | return r; | |
177 | ||
178 | return sd_event_source_set_enabled(s->timer_event_source, SD_EVENT_ONESHOT); | |
179 | } | |
180 | ||
7dfbe2e3 | 181 | r = sd_event_add_time( |
6a0f1f6d LP |
182 | UNIT(s)->manager->event, |
183 | &s->timer_event_source, | |
184 | CLOCK_MONOTONIC, | |
185 | now(CLOCK_MONOTONIC) + s->timeout_usec, 0, | |
186 | swap_dispatch_timer, s); | |
7dfbe2e3 TG |
187 | if (r < 0) |
188 | return r; | |
189 | ||
190 | (void) sd_event_source_set_description(s->timer_event_source, "swap-timer"); | |
191 | ||
192 | return 0; | |
07b0b134 ML |
193 | } |
194 | ||
173a8d04 | 195 | static int swap_add_device_links(Swap *s) { |
173a8d04 LP |
196 | assert(s); |
197 | ||
198 | if (!s->what) | |
199 | return 0; | |
200 | ||
f10af76d LP |
201 | if (!s->from_fragment) |
202 | return 0; | |
203 | ||
cfcfd4ae | 204 | if (is_device_path(s->what)) |
b2c23da8 | 205 | return unit_add_node_link(UNIT(s), s->what, UNIT(s)->manager->running_as == MANAGER_SYSTEM); |
cfcfd4ae LP |
206 | else |
207 | /* File based swap devices need to be ordered after | |
2b93b027 | 208 | * systemd-remount-fs.service, since they might need a |
cfcfd4ae | 209 | * writable file system. */ |
2b93b027 | 210 | return unit_add_dependency_by_name(UNIT(s), UNIT_AFTER, SPECIAL_REMOUNT_FS_SERVICE, NULL, true); |
173a8d04 LP |
211 | } |
212 | ||
2edd4434 | 213 | static int swap_add_default_dependencies(Swap *s) { |
2edd4434 LP |
214 | assert(s); |
215 | ||
b2c23da8 | 216 | if (UNIT(s)->manager->running_as != MANAGER_SYSTEM) |
6b1dc2bd | 217 | return 0; |
2edd4434 | 218 | |
75f86906 | 219 | if (detect_container() > 0) |
c0387ebf LP |
220 | return 0; |
221 | ||
5607d856 | 222 | return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true); |
2edd4434 LP |
223 | } |
224 | ||
4e85aff4 | 225 | static int swap_verify(Swap *s) { |
7fd1b19b | 226 | _cleanup_free_ char *e = NULL; |
7410616c | 227 | int r; |
4e85aff4 | 228 | |
1124fe6f | 229 | if (UNIT(s)->load_state != UNIT_LOADED) |
5bcb0f2b | 230 | return 0; |
4e85aff4 | 231 | |
7410616c LP |
232 | r = unit_name_from_path(s->what, ".swap", &e); |
233 | if (r < 0) | |
f2341e0a | 234 | return log_unit_error_errno(UNIT(s), r, "Failed to generate unit name from path: %m"); |
4e85aff4 | 235 | |
7410616c | 236 | if (!unit_has_name(UNIT(s), e)) { |
f2341e0a | 237 | log_unit_error(UNIT(s), "Value of What= and unit name do not match, not loading."); |
4e85aff4 LP |
238 | return -EINVAL; |
239 | } | |
240 | ||
4819ff03 | 241 | if (s->exec_context.pam_name && s->kill_context.kill_mode != KILL_CONTROL_GROUP) { |
f2341e0a | 242 | log_unit_error(UNIT(s), "Unit has PAM enabled. Kill mode must be set to 'control-group'. Refusing to load."); |
e04aad61 LP |
243 | return -EINVAL; |
244 | } | |
245 | ||
4e85aff4 LP |
246 | return 0; |
247 | } | |
248 | ||
9670d583 LP |
249 | static int swap_load_devnode(Swap *s) { |
250 | _cleanup_udev_device_unref_ struct udev_device *d = NULL; | |
251 | struct stat st; | |
252 | const char *p; | |
253 | ||
254 | assert(s); | |
255 | ||
256 | if (stat(s->what, &st) < 0 || !S_ISBLK(st.st_mode)) | |
257 | return 0; | |
258 | ||
259 | d = udev_device_new_from_devnum(UNIT(s)->manager->udev, 'b', st.st_rdev); | |
260 | if (!d) | |
261 | return 0; | |
262 | ||
263 | p = udev_device_get_devnode(d); | |
264 | if (!p) | |
265 | return 0; | |
266 | ||
267 | return swap_set_devnode(s, p); | |
268 | } | |
269 | ||
07b0b134 ML |
270 | static int swap_load(Unit *u) { |
271 | int r; | |
272 | Swap *s = SWAP(u); | |
273 | ||
274 | assert(s); | |
ac155bb8 | 275 | assert(u->load_state == UNIT_STUB); |
07b0b134 ML |
276 | |
277 | /* Load a .swap file */ | |
646134dc ZJS |
278 | r = unit_load_fragment_and_dropin_optional(u); |
279 | if (r < 0) | |
07b0b134 ML |
280 | return r; |
281 | ||
ac155bb8 | 282 | if (u->load_state == UNIT_LOADED) { |
4e85aff4 | 283 | |
1124fe6f | 284 | if (UNIT(s)->fragment_path) |
4e85aff4 LP |
285 | s->from_fragment = true; |
286 | ||
287 | if (!s->what) { | |
288 | if (s->parameters_fragment.what) | |
289 | s->what = strdup(s->parameters_fragment.what); | |
4e85aff4 LP |
290 | else if (s->parameters_proc_swaps.what) |
291 | s->what = strdup(s->parameters_proc_swaps.what); | |
7410616c LP |
292 | else { |
293 | r = unit_name_to_path(u->id, &s->what); | |
294 | if (r < 0) | |
295 | return r; | |
296 | } | |
4e85aff4 LP |
297 | |
298 | if (!s->what) | |
07b0b134 | 299 | return -ENOMEM; |
4e85aff4 | 300 | } |
07b0b134 ML |
301 | |
302 | path_kill_slashes(s->what); | |
303 | ||
5bcb0f2b LP |
304 | if (!UNIT(s)->description) { |
305 | r = unit_set_description(u, s->what); | |
306 | if (r < 0) | |
4e85aff4 | 307 | return r; |
5bcb0f2b | 308 | } |
4e85aff4 | 309 | |
a57f7e2c | 310 | r = unit_require_mounts_for(UNIT(s), s->what); |
646134dc | 311 | if (r < 0) |
07b0b134 ML |
312 | return r; |
313 | ||
a57f7e2c | 314 | r = swap_add_device_links(s); |
646134dc | 315 | if (r < 0) |
6e2ef85b | 316 | return r; |
07b0b134 | 317 | |
9670d583 LP |
318 | r = swap_load_devnode(s); |
319 | if (r < 0) | |
320 | return r; | |
321 | ||
598459ce LP |
322 | r = unit_patch_contexts(u); |
323 | if (r < 0) | |
324 | return r; | |
325 | ||
326 | r = unit_add_exec_dependencies(u, &s->exec_context); | |
327 | if (r < 0) | |
328 | return r; | |
329 | ||
d79200e2 | 330 | r = unit_set_default_slice(u); |
a016b922 LP |
331 | if (r < 0) |
332 | return r; | |
333 | ||
646134dc ZJS |
334 | if (UNIT(s)->default_dependencies) { |
335 | r = swap_add_default_dependencies(s); | |
336 | if (r < 0) | |
2edd4434 | 337 | return r; |
646134dc | 338 | } |
07b0b134 ML |
339 | } |
340 | ||
341 | return swap_verify(s); | |
342 | } | |
343 | ||
628c89cc | 344 | static int swap_setup_unit( |
4e85aff4 LP |
345 | Manager *m, |
346 | const char *what, | |
e04aad61 | 347 | const char *what_proc_swaps, |
4e85aff4 | 348 | int priority, |
e04aad61 LP |
349 | bool set_flags) { |
350 | ||
7fd1b19b | 351 | _cleanup_free_ char *e = NULL; |
2c7c6144 | 352 | bool delete = false; |
5bcb0f2b | 353 | Unit *u = NULL; |
07b0b134 | 354 | int r; |
4e85aff4 LP |
355 | SwapParameters *p; |
356 | ||
357 | assert(m); | |
358 | assert(what); | |
6b1dc2bd | 359 | assert(what_proc_swaps); |
07b0b134 | 360 | |
7410616c LP |
361 | r = unit_name_from_path(what, ".swap", &e); |
362 | if (r < 0) | |
f2341e0a | 363 | return log_unit_error_errno(u, r, "Failed to generate unit name from path: %m"); |
07b0b134 | 364 | |
e04aad61 LP |
365 | u = manager_get_unit(m, e); |
366 | ||
6b1dc2bd | 367 | if (u && |
e04aad61 | 368 | SWAP(u)->from_proc_swaps && |
628c89cc LP |
369 | !path_equal(SWAP(u)->parameters_proc_swaps.what, what_proc_swaps)) { |
370 | log_error("Swap %s appeared twice with different device paths %s and %s", e, SWAP(u)->parameters_proc_swaps.what, what_proc_swaps); | |
e04aad61 | 371 | return -EEXIST; |
628c89cc | 372 | } |
4e85aff4 LP |
373 | |
374 | if (!u) { | |
07b0b134 ML |
375 | delete = true; |
376 | ||
7d17cfbc | 377 | u = unit_new(m, sizeof(Swap)); |
170ca19e ZJS |
378 | if (!u) |
379 | return log_oom(); | |
e04aad61 | 380 | |
7d17cfbc MS |
381 | r = unit_add_name(u, e); |
382 | if (r < 0) | |
e04aad61 LP |
383 | goto fail; |
384 | ||
7d17cfbc MS |
385 | SWAP(u)->what = strdup(what); |
386 | if (!SWAP(u)->what) { | |
628c89cc | 387 | r = -ENOMEM; |
e04aad61 LP |
388 | goto fail; |
389 | } | |
390 | ||
391 | unit_add_to_load_queue(u); | |
4e85aff4 LP |
392 | } else |
393 | delete = false; | |
07b0b134 | 394 | |
6b1dc2bd | 395 | p = &SWAP(u)->parameters_proc_swaps; |
07b0b134 | 396 | |
6b1dc2bd | 397 | if (!p->what) { |
5bcb0f2b LP |
398 | p->what = strdup(what_proc_swaps); |
399 | if (!p->what) { | |
400 | r = -ENOMEM; | |
6b1dc2bd LP |
401 | goto fail; |
402 | } | |
6b1dc2bd | 403 | } |
e04aad61 | 404 | |
6b1dc2bd LP |
405 | if (set_flags) { |
406 | SWAP(u)->is_active = true; | |
407 | SWAP(u)->just_activated = !SWAP(u)->from_proc_swaps; | |
4e85aff4 | 408 | } |
07b0b134 | 409 | |
6b1dc2bd LP |
410 | SWAP(u)->from_proc_swaps = true; |
411 | ||
4e85aff4 | 412 | p->priority = priority; |
07b0b134 | 413 | |
4e85aff4 | 414 | unit_add_to_dbus_queue(u); |
07b0b134 ML |
415 | return 0; |
416 | ||
417 | fail: | |
f2341e0a | 418 | log_unit_warning_errno(u, r, "Failed to load swap unit: %m"); |
e04aad61 | 419 | |
4e85aff4 | 420 | if (delete && u) |
07b0b134 ML |
421 | unit_free(u); |
422 | ||
4e85aff4 | 423 | return r; |
07b0b134 ML |
424 | } |
425 | ||
628c89cc | 426 | static int swap_process_new(Manager *m, const char *device, int prio, bool set_flags) { |
5bcb0f2b LP |
427 | _cleanup_udev_device_unref_ struct udev_device *d = NULL; |
428 | struct udev_list_entry *item = NULL, *first = NULL; | |
429 | const char *dn; | |
e04aad61 | 430 | struct stat st; |
5bcb0f2b | 431 | int r; |
e04aad61 LP |
432 | |
433 | assert(m); | |
434 | ||
628c89cc | 435 | r = swap_setup_unit(m, device, device, prio, set_flags); |
5bcb0f2b LP |
436 | if (r < 0) |
437 | return r; | |
e04aad61 | 438 | |
5bcb0f2b LP |
439 | /* If this is a block device, then let's add duplicates for |
440 | * all other names of this block device */ | |
441 | if (stat(device, &st) < 0 || !S_ISBLK(st.st_mode)) | |
442 | return 0; | |
e04aad61 | 443 | |
5bcb0f2b LP |
444 | d = udev_device_new_from_devnum(m->udev, 'b', st.st_rdev); |
445 | if (!d) | |
446 | return 0; | |
e04aad61 | 447 | |
5bcb0f2b LP |
448 | /* Add the main device node */ |
449 | dn = udev_device_get_devnode(d); | |
450 | if (dn && !streq(dn, device)) | |
628c89cc | 451 | swap_setup_unit(m, dn, device, prio, set_flags); |
e04aad61 | 452 | |
5bcb0f2b LP |
453 | /* Add additional units for all symlinks */ |
454 | first = udev_device_get_devlinks_list_entry(d); | |
455 | udev_list_entry_foreach(item, first) { | |
456 | const char *p; | |
e04aad61 | 457 | |
5bcb0f2b LP |
458 | /* Don't bother with the /dev/block links */ |
459 | p = udev_list_entry_get_name(item); | |
e04aad61 | 460 | |
5bcb0f2b LP |
461 | if (streq(p, device)) |
462 | continue; | |
e04aad61 | 463 | |
5bcb0f2b LP |
464 | if (path_startswith(p, "/dev/block/")) |
465 | continue; | |
e04aad61 | 466 | |
5bcb0f2b LP |
467 | if (stat(p, &st) >= 0) |
468 | if (!S_ISBLK(st.st_mode) || | |
469 | st.st_rdev != udev_device_get_devnum(d)) | |
470 | continue; | |
e04aad61 | 471 | |
628c89cc | 472 | swap_setup_unit(m, p, device, prio, set_flags); |
e04aad61 LP |
473 | } |
474 | ||
e04aad61 LP |
475 | return r; |
476 | } | |
477 | ||
07b0b134 ML |
478 | static void swap_set_state(Swap *s, SwapState state) { |
479 | SwapState old_state; | |
37cf8fee | 480 | Swap *other; |
e04aad61 | 481 | |
07b0b134 ML |
482 | assert(s); |
483 | ||
484 | old_state = s->state; | |
485 | s->state = state; | |
486 | ||
e04aad61 LP |
487 | if (state != SWAP_ACTIVATING && |
488 | state != SWAP_ACTIVATING_SIGTERM && | |
489 | state != SWAP_ACTIVATING_SIGKILL && | |
5bcb0f2b | 490 | state != SWAP_ACTIVATING_DONE && |
e04aad61 LP |
491 | state != SWAP_DEACTIVATING && |
492 | state != SWAP_DEACTIVATING_SIGTERM && | |
493 | state != SWAP_DEACTIVATING_SIGKILL) { | |
718db961 | 494 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
e04aad61 LP |
495 | swap_unwatch_control_pid(s); |
496 | s->control_command = NULL; | |
497 | s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; | |
498 | } | |
499 | ||
07b0b134 | 500 | if (state != old_state) |
f2341e0a | 501 | log_unit_debug(UNIT(s), "Changed %s -> %s", swap_state_to_string(old_state), swap_state_to_string(state)); |
07b0b134 | 502 | |
5bcb0f2b | 503 | unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], true); |
37cf8fee LP |
504 | |
505 | /* If there other units for the same device node have a job | |
506 | queued it might be worth checking again if it is runnable | |
507 | now. This is necessary, since swap_start() refuses | |
508 | operation with EAGAIN if there's already another job for | |
509 | the same device node queued. */ | |
510 | LIST_FOREACH_OTHERS(same_devnode, other, s) | |
511 | if (UNIT(other)->job) | |
512 | job_add_to_run_queue(UNIT(other)->job); | |
07b0b134 ML |
513 | } |
514 | ||
be847e82 | 515 | static int swap_coldplug(Unit *u) { |
07b0b134 ML |
516 | Swap *s = SWAP(u); |
517 | SwapState new_state = SWAP_DEAD; | |
e04aad61 | 518 | int r; |
07b0b134 ML |
519 | |
520 | assert(s); | |
521 | assert(s->state == SWAP_DEAD); | |
522 | ||
523 | if (s->deserialized_state != s->state) | |
524 | new_state = s->deserialized_state; | |
4e85aff4 | 525 | else if (s->from_proc_swaps) |
07b0b134 ML |
526 | new_state = SWAP_ACTIVE; |
527 | ||
5bcb0f2b LP |
528 | if (new_state == s->state) |
529 | return 0; | |
e04aad61 | 530 | |
c386f588 LP |
531 | if (s->control_pid > 0 && |
532 | pid_is_unwaited(s->control_pid) && | |
533 | IN_SET(new_state, | |
534 | SWAP_ACTIVATING, | |
535 | SWAP_ACTIVATING_SIGTERM, | |
536 | SWAP_ACTIVATING_SIGKILL, | |
537 | SWAP_ACTIVATING_DONE, | |
538 | SWAP_DEACTIVATING, | |
539 | SWAP_DEACTIVATING_SIGTERM, | |
540 | SWAP_DEACTIVATING_SIGKILL)) { | |
e04aad61 | 541 | |
5bcb0f2b LP |
542 | r = unit_watch_pid(UNIT(s), s->control_pid); |
543 | if (r < 0) | |
544 | return r; | |
e04aad61 | 545 | |
5bcb0f2b LP |
546 | r = swap_arm_timer(s); |
547 | if (r < 0) | |
548 | return r; | |
e04aad61 | 549 | } |
07b0b134 | 550 | |
5bcb0f2b | 551 | swap_set_state(s, new_state); |
07b0b134 ML |
552 | return 0; |
553 | } | |
554 | ||
555 | static void swap_dump(Unit *u, FILE *f, const char *prefix) { | |
556 | Swap *s = SWAP(u); | |
4e85aff4 | 557 | SwapParameters *p; |
07b0b134 ML |
558 | |
559 | assert(s); | |
4e85aff4 LP |
560 | assert(f); |
561 | ||
562 | if (s->from_proc_swaps) | |
563 | p = &s->parameters_proc_swaps; | |
564 | else if (s->from_fragment) | |
565 | p = &s->parameters_fragment; | |
b6bfc7bb LP |
566 | else |
567 | p = NULL; | |
07b0b134 ML |
568 | |
569 | fprintf(f, | |
4e85aff4 | 570 | "%sSwap State: %s\n" |
e1770af8 | 571 | "%sResult: %s\n" |
07b0b134 | 572 | "%sWhat: %s\n" |
4e85aff4 LP |
573 | "%sFrom /proc/swaps: %s\n" |
574 | "%sFrom fragment: %s\n", | |
07b0b134 | 575 | prefix, swap_state_to_string(s->state), |
e1770af8 | 576 | prefix, swap_result_to_string(s->result), |
07b0b134 | 577 | prefix, s->what, |
4e85aff4 LP |
578 | prefix, yes_no(s->from_proc_swaps), |
579 | prefix, yes_no(s->from_fragment)); | |
e04aad61 | 580 | |
9670d583 LP |
581 | if (s->devnode) |
582 | fprintf(f, "%sDevice Node: %s\n", prefix, s->devnode); | |
583 | ||
b6bfc7bb LP |
584 | if (p) |
585 | fprintf(f, | |
586 | "%sPriority: %i\n" | |
47cb901e | 587 | "%sOptions: %s\n", |
b6bfc7bb | 588 | prefix, p->priority, |
47cb901e | 589 | prefix, strempty(p->options)); |
b6bfc7bb | 590 | |
e04aad61 LP |
591 | if (s->control_pid > 0) |
592 | fprintf(f, | |
de0671ee ZJS |
593 | "%sControl PID: "PID_FMT"\n", |
594 | prefix, s->control_pid); | |
e04aad61 LP |
595 | |
596 | exec_context_dump(&s->exec_context, f, prefix); | |
4819ff03 | 597 | kill_context_dump(&s->kill_context, f, prefix); |
e04aad61 LP |
598 | } |
599 | ||
600 | static int swap_spawn(Swap *s, ExecCommand *c, pid_t *_pid) { | |
601 | pid_t pid; | |
602 | int r; | |
9fa95f85 DM |
603 | ExecParameters exec_params = { |
604 | .apply_permissions = true, | |
605 | .apply_chroot = true, | |
606 | .apply_tty_stdin = true, | |
6f856a09 | 607 | .bus_endpoint_fd = -1, |
a34ceba6 LP |
608 | .stdin_fd = -1, |
609 | .stdout_fd = -1, | |
610 | .stderr_fd = -1, | |
9fa95f85 | 611 | }; |
e04aad61 LP |
612 | |
613 | assert(s); | |
614 | assert(c); | |
615 | assert(_pid); | |
616 | ||
5ad096b3 LP |
617 | (void) unit_realize_cgroup(UNIT(s)); |
618 | if (s->reset_cpu_usage) { | |
619 | (void) unit_reset_cpu_usage(UNIT(s)); | |
620 | s->reset_cpu_usage = false; | |
621 | } | |
4ad49000 | 622 | |
613b411c LP |
623 | r = unit_setup_exec_runtime(UNIT(s)); |
624 | if (r < 0) | |
625 | goto fail; | |
626 | ||
718db961 | 627 | r = swap_arm_timer(s); |
646134dc | 628 | if (r < 0) |
e04aad61 LP |
629 | goto fail; |
630 | ||
9fa95f85 DM |
631 | exec_params.environment = UNIT(s)->manager->environment; |
632 | exec_params.confirm_spawn = UNIT(s)->manager->confirm_spawn; | |
633 | exec_params.cgroup_supported = UNIT(s)->manager->cgroup_supported; | |
634 | exec_params.cgroup_path = UNIT(s)->cgroup_path; | |
a931ad47 | 635 | exec_params.cgroup_delegate = s->cgroup_context.delegate; |
9fa95f85 | 636 | exec_params.runtime_prefix = manager_get_runtime_prefix(UNIT(s)->manager); |
9fa95f85 | 637 | |
f2341e0a LP |
638 | r = exec_spawn(UNIT(s), |
639 | c, | |
646134dc | 640 | &s->exec_context, |
9fa95f85 | 641 | &exec_params, |
613b411c | 642 | s->exec_runtime, |
646134dc ZJS |
643 | &pid); |
644 | if (r < 0) | |
e04aad61 LP |
645 | goto fail; |
646 | ||
646134dc ZJS |
647 | r = unit_watch_pid(UNIT(s), pid); |
648 | if (r < 0) | |
e04aad61 LP |
649 | /* FIXME: we need to do something here */ |
650 | goto fail; | |
651 | ||
652 | *_pid = pid; | |
653 | ||
654 | return 0; | |
655 | ||
656 | fail: | |
718db961 | 657 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
e04aad61 | 658 | return r; |
07b0b134 ML |
659 | } |
660 | ||
e1770af8 | 661 | static void swap_enter_dead(Swap *s, SwapResult f) { |
07b0b134 ML |
662 | assert(s); |
663 | ||
e1770af8 LP |
664 | if (f != SWAP_SUCCESS) |
665 | s->result = f; | |
e04aad61 | 666 | |
613b411c LP |
667 | exec_runtime_destroy(s->exec_runtime); |
668 | s->exec_runtime = exec_runtime_unref(s->exec_runtime); | |
669 | ||
e66cf1a3 LP |
670 | exec_context_destroy_runtime_directory(&s->exec_context, manager_get_runtime_prefix(UNIT(s)->manager)); |
671 | ||
e1770af8 | 672 | swap_set_state(s, s->result != SWAP_SUCCESS ? SWAP_FAILED : SWAP_DEAD); |
07b0b134 ML |
673 | } |
674 | ||
e1770af8 | 675 | static void swap_enter_active(Swap *s, SwapResult f) { |
e04aad61 LP |
676 | assert(s); |
677 | ||
e1770af8 LP |
678 | if (f != SWAP_SUCCESS) |
679 | s->result = f; | |
e04aad61 LP |
680 | |
681 | swap_set_state(s, SWAP_ACTIVE); | |
682 | } | |
683 | ||
e1770af8 | 684 | static void swap_enter_signal(Swap *s, SwapState state, SwapResult f) { |
07b0b134 ML |
685 | int r; |
686 | ||
687 | assert(s); | |
e04aad61 | 688 | |
e1770af8 LP |
689 | if (f != SWAP_SUCCESS) |
690 | s->result = f; | |
e04aad61 | 691 | |
cd2086fe LP |
692 | r = unit_kill_context( |
693 | UNIT(s), | |
694 | &s->kill_context, | |
db2cb23b UTL |
695 | (state != SWAP_ACTIVATING_SIGTERM && state != SWAP_DEACTIVATING_SIGTERM) ? |
696 | KILL_KILL : KILL_TERMINATE, | |
cd2086fe LP |
697 | -1, |
698 | s->control_pid, | |
699 | false); | |
700 | if (r < 0) | |
701 | goto fail; | |
e04aad61 | 702 | |
cd2086fe | 703 | if (r > 0) { |
718db961 | 704 | r = swap_arm_timer(s); |
646134dc | 705 | if (r < 0) |
e04aad61 LP |
706 | goto fail; |
707 | ||
708 | swap_set_state(s, state); | |
ac84d1fb LP |
709 | } else if (state == SWAP_ACTIVATING_SIGTERM) |
710 | swap_enter_signal(s, SWAP_ACTIVATING_SIGKILL, SWAP_SUCCESS); | |
711 | else if (state == SWAP_DEACTIVATING_SIGTERM) | |
712 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, SWAP_SUCCESS); | |
713 | else | |
e1770af8 | 714 | swap_enter_dead(s, SWAP_SUCCESS); |
e04aad61 LP |
715 | |
716 | return; | |
717 | ||
718 | fail: | |
f2341e0a | 719 | log_unit_warning_errno(UNIT(s), r, "Failed to kill processes: %m"); |
e1770af8 | 720 | swap_enter_dead(s, SWAP_FAILURE_RESOURCES); |
e04aad61 LP |
721 | } |
722 | ||
723 | static void swap_enter_activating(Swap *s) { | |
bf1d7ba7 KZ |
724 | _cleanup_free_ char *opts = NULL; |
725 | int r; | |
e04aad61 LP |
726 | |
727 | assert(s); | |
728 | ||
729 | s->control_command_id = SWAP_EXEC_ACTIVATE; | |
730 | s->control_command = s->exec_command + SWAP_EXEC_ACTIVATE; | |
07b0b134 | 731 | |
86b23b07 | 732 | if (s->from_fragment) { |
bf1d7ba7 | 733 | int priority = -1; |
47cb901e | 734 | |
bf1d7ba7 KZ |
735 | r = fstab_find_pri(s->parameters_fragment.options, &priority); |
736 | if (r < 0) | |
737 | log_warning_errno(r, "Failed to parse swap priority \"%s\", ignoring: %m", s->parameters_fragment.options); | |
738 | else if (r == 1 && s->parameters_fragment.priority >= 0) | |
739 | log_warning("Duplicate swap priority configuration by Priority and Options fields."); | |
740 | ||
741 | if (r <= 0 && s->parameters_fragment.priority >= 0) { | |
742 | if (s->parameters_fragment.options) | |
743 | r = asprintf(&opts, "%s,pri=%i", s->parameters_fragment.options, s->parameters_fragment.priority); | |
744 | else | |
745 | r = asprintf(&opts, "pri=%i", s->parameters_fragment.priority); | |
e64d5235 | 746 | if (r < 0) |
bf1d7ba7 | 747 | goto fail; |
e64d5235 | 748 | } |
86b23b07 JS |
749 | } |
750 | ||
751 | r = exec_command_set(s->control_command, "/sbin/swapon", NULL); | |
752 | if (r < 0) | |
753 | goto fail; | |
4e85aff4 | 754 | |
bf1d7ba7 KZ |
755 | if (s->parameters_fragment.options || opts) { |
756 | r = exec_command_append(s->control_command, "-o", | |
757 | opts ? : s->parameters_fragment.options, NULL); | |
86b23b07 JS |
758 | if (r < 0) |
759 | goto fail; | |
760 | } | |
e04aad61 | 761 | |
86b23b07 | 762 | r = exec_command_append(s->control_command, s->what, NULL); |
e04aad61 LP |
763 | if (r < 0) |
764 | goto fail; | |
765 | ||
766 | swap_unwatch_control_pid(s); | |
767 | ||
646134dc ZJS |
768 | r = swap_spawn(s, s->control_command, &s->control_pid); |
769 | if (r < 0) | |
e04aad61 LP |
770 | goto fail; |
771 | ||
772 | swap_set_state(s, SWAP_ACTIVATING); | |
773 | ||
774 | return; | |
775 | ||
776 | fail: | |
f2341e0a | 777 | log_unit_warning_errno(UNIT(s), r, "Failed to run 'swapon' task: %m"); |
e1770af8 | 778 | swap_enter_dead(s, SWAP_FAILURE_RESOURCES); |
e04aad61 LP |
779 | } |
780 | ||
e1770af8 | 781 | static void swap_enter_deactivating(Swap *s) { |
e04aad61 LP |
782 | int r; |
783 | ||
784 | assert(s); | |
785 | ||
e04aad61 LP |
786 | s->control_command_id = SWAP_EXEC_DEACTIVATE; |
787 | s->control_command = s->exec_command + SWAP_EXEC_DEACTIVATE; | |
788 | ||
646134dc | 789 | r = exec_command_set(s->control_command, |
e04aad61 LP |
790 | "/sbin/swapoff", |
791 | s->what, | |
646134dc ZJS |
792 | NULL); |
793 | if (r < 0) | |
e04aad61 LP |
794 | goto fail; |
795 | ||
796 | swap_unwatch_control_pid(s); | |
797 | ||
646134dc ZJS |
798 | r = swap_spawn(s, s->control_command, &s->control_pid); |
799 | if (r < 0) | |
e04aad61 LP |
800 | goto fail; |
801 | ||
802 | swap_set_state(s, SWAP_DEACTIVATING); | |
803 | ||
804 | return; | |
805 | ||
806 | fail: | |
f2341e0a | 807 | log_unit_warning_errno(UNIT(s), r, "Failed to run 'swapoff' task: %m"); |
e1770af8 | 808 | swap_enter_active(s, SWAP_FAILURE_RESOURCES); |
e04aad61 LP |
809 | } |
810 | ||
811 | static int swap_start(Unit *u) { | |
37cf8fee | 812 | Swap *s = SWAP(u), *other; |
e04aad61 LP |
813 | |
814 | assert(s); | |
815 | ||
816 | /* We cannot fulfill this request right now, try again later | |
817 | * please! */ | |
818 | ||
819 | if (s->state == SWAP_DEACTIVATING || | |
820 | s->state == SWAP_DEACTIVATING_SIGTERM || | |
821 | s->state == SWAP_DEACTIVATING_SIGKILL || | |
822 | s->state == SWAP_ACTIVATING_SIGTERM || | |
823 | s->state == SWAP_ACTIVATING_SIGKILL) | |
824 | return -EAGAIN; | |
825 | ||
826 | if (s->state == SWAP_ACTIVATING) | |
827 | return 0; | |
828 | ||
829 | assert(s->state == SWAP_DEAD || s->state == SWAP_FAILED); | |
830 | ||
75f86906 | 831 | if (detect_container() > 0) |
a5c3034f LP |
832 | return -EPERM; |
833 | ||
37cf8fee LP |
834 | /* If there's a job for another swap unit for the same node |
835 | * running, then let's not dispatch this one for now, and wait | |
836 | * until that other job has finished. */ | |
837 | LIST_FOREACH_OTHERS(same_devnode, other, s) | |
838 | if (UNIT(other)->job && UNIT(other)->job->state == JOB_RUNNING) | |
839 | return -EAGAIN; | |
840 | ||
e1770af8 | 841 | s->result = SWAP_SUCCESS; |
5ad096b3 LP |
842 | s->reset_cpu_usage = true; |
843 | ||
e04aad61 | 844 | swap_enter_activating(s); |
82a2b6bb | 845 | return 1; |
07b0b134 ML |
846 | } |
847 | ||
848 | static int swap_stop(Unit *u) { | |
849 | Swap *s = SWAP(u); | |
07b0b134 ML |
850 | |
851 | assert(s); | |
852 | ||
e04aad61 LP |
853 | if (s->state == SWAP_DEACTIVATING || |
854 | s->state == SWAP_DEACTIVATING_SIGTERM || | |
855 | s->state == SWAP_DEACTIVATING_SIGKILL || | |
856 | s->state == SWAP_ACTIVATING_SIGTERM || | |
857 | s->state == SWAP_ACTIVATING_SIGKILL) | |
858 | return 0; | |
07b0b134 | 859 | |
e04aad61 | 860 | assert(s->state == SWAP_ACTIVATING || |
5bcb0f2b | 861 | s->state == SWAP_ACTIVATING_DONE || |
e04aad61 | 862 | s->state == SWAP_ACTIVE); |
07b0b134 | 863 | |
75f86906 | 864 | if (detect_container() > 0) |
a5c3034f LP |
865 | return -EPERM; |
866 | ||
e1770af8 | 867 | swap_enter_deactivating(s); |
82a2b6bb | 868 | return 1; |
07b0b134 ML |
869 | } |
870 | ||
871 | static int swap_serialize(Unit *u, FILE *f, FDSet *fds) { | |
872 | Swap *s = SWAP(u); | |
873 | ||
874 | assert(s); | |
875 | assert(f); | |
876 | assert(fds); | |
877 | ||
878 | unit_serialize_item(u, f, "state", swap_state_to_string(s->state)); | |
e1770af8 | 879 | unit_serialize_item(u, f, "result", swap_result_to_string(s->result)); |
e04aad61 LP |
880 | |
881 | if (s->control_pid > 0) | |
de0671ee | 882 | unit_serialize_item_format(u, f, "control-pid", PID_FMT, s->control_pid); |
e04aad61 LP |
883 | |
884 | if (s->control_command_id >= 0) | |
885 | unit_serialize_item(u, f, "control-command", swap_exec_command_to_string(s->control_command_id)); | |
07b0b134 ML |
886 | |
887 | return 0; | |
888 | } | |
889 | ||
890 | static int swap_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
891 | Swap *s = SWAP(u); | |
892 | ||
893 | assert(s); | |
894 | assert(fds); | |
895 | ||
896 | if (streq(key, "state")) { | |
897 | SwapState state; | |
898 | ||
646134dc ZJS |
899 | state = swap_state_from_string(value); |
900 | if (state < 0) | |
f2341e0a | 901 | log_unit_debug(u, "Failed to parse state value: %s", value); |
07b0b134 ML |
902 | else |
903 | s->deserialized_state = state; | |
e1770af8 LP |
904 | } else if (streq(key, "result")) { |
905 | SwapResult f; | |
906 | ||
907 | f = swap_result_from_string(value); | |
908 | if (f < 0) | |
f2341e0a | 909 | log_unit_debug(u, "Failed to parse result value: %s", value); |
e1770af8 LP |
910 | else if (f != SWAP_SUCCESS) |
911 | s->result = f; | |
e04aad61 LP |
912 | } else if (streq(key, "control-pid")) { |
913 | pid_t pid; | |
914 | ||
915 | if (parse_pid(value, &pid) < 0) | |
f2341e0a | 916 | log_unit_debug(u, "Failed to parse control-pid value: %s", value); |
e04aad61 LP |
917 | else |
918 | s->control_pid = pid; | |
919 | ||
920 | } else if (streq(key, "control-command")) { | |
921 | SwapExecCommand id; | |
922 | ||
646134dc ZJS |
923 | id = swap_exec_command_from_string(value); |
924 | if (id < 0) | |
f2341e0a | 925 | log_unit_debug(u, "Failed to parse exec-command value: %s", value); |
e04aad61 LP |
926 | else { |
927 | s->control_command_id = id; | |
928 | s->control_command = s->exec_command + id; | |
929 | } | |
07b0b134 | 930 | } else |
f2341e0a | 931 | log_unit_debug(u, "Unknown serialization key: %s", key); |
07b0b134 ML |
932 | |
933 | return 0; | |
934 | } | |
935 | ||
44a6b1b6 | 936 | _pure_ static UnitActiveState swap_active_state(Unit *u) { |
07b0b134 ML |
937 | assert(u); |
938 | ||
939 | return state_translation_table[SWAP(u)->state]; | |
940 | } | |
941 | ||
44a6b1b6 | 942 | _pure_ static const char *swap_sub_state_to_string(Unit *u) { |
07b0b134 ML |
943 | assert(u); |
944 | ||
945 | return swap_state_to_string(SWAP(u)->state); | |
946 | } | |
947 | ||
44a6b1b6 | 948 | _pure_ static bool swap_check_gc(Unit *u) { |
07b0b134 ML |
949 | Swap *s = SWAP(u); |
950 | ||
951 | assert(s); | |
952 | ||
6b1dc2bd | 953 | return s->from_proc_swaps; |
07b0b134 ML |
954 | } |
955 | ||
e04aad61 LP |
956 | static void swap_sigchld_event(Unit *u, pid_t pid, int code, int status) { |
957 | Swap *s = SWAP(u); | |
e1770af8 | 958 | SwapResult f; |
e04aad61 LP |
959 | |
960 | assert(s); | |
961 | assert(pid >= 0); | |
962 | ||
963 | if (pid != s->control_pid) | |
964 | return; | |
965 | ||
966 | s->control_pid = 0; | |
967 | ||
96342de6 | 968 | if (is_clean_exit(code, status, NULL)) |
e1770af8 LP |
969 | f = SWAP_SUCCESS; |
970 | else if (code == CLD_EXITED) | |
971 | f = SWAP_FAILURE_EXIT_CODE; | |
972 | else if (code == CLD_KILLED) | |
973 | f = SWAP_FAILURE_SIGNAL; | |
974 | else if (code == CLD_DUMPED) | |
975 | f = SWAP_FAILURE_CORE_DUMP; | |
976 | else | |
977 | assert_not_reached("Unknown code"); | |
978 | ||
979 | if (f != SWAP_SUCCESS) | |
980 | s->result = f; | |
e04aad61 LP |
981 | |
982 | if (s->control_command) { | |
6ea832a2 | 983 | exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status); |
e1770af8 | 984 | |
e04aad61 LP |
985 | s->control_command = NULL; |
986 | s->control_command_id = _SWAP_EXEC_COMMAND_INVALID; | |
987 | } | |
988 | ||
f2341e0a LP |
989 | log_unit_full(u, f == SWAP_SUCCESS ? LOG_DEBUG : LOG_NOTICE, 0, |
990 | "Swap process exited, code=%s status=%i", sigchld_code_to_string(code), status); | |
e04aad61 LP |
991 | |
992 | switch (s->state) { | |
993 | ||
994 | case SWAP_ACTIVATING: | |
5bcb0f2b | 995 | case SWAP_ACTIVATING_DONE: |
e04aad61 LP |
996 | case SWAP_ACTIVATING_SIGTERM: |
997 | case SWAP_ACTIVATING_SIGKILL: | |
998 | ||
e1770af8 LP |
999 | if (f == SWAP_SUCCESS) |
1000 | swap_enter_active(s, f); | |
e04aad61 | 1001 | else |
e1770af8 | 1002 | swap_enter_dead(s, f); |
e04aad61 LP |
1003 | break; |
1004 | ||
1005 | case SWAP_DEACTIVATING: | |
1006 | case SWAP_DEACTIVATING_SIGKILL: | |
1007 | case SWAP_DEACTIVATING_SIGTERM: | |
1008 | ||
7bb01eff | 1009 | swap_enter_dead(s, f); |
e04aad61 LP |
1010 | break; |
1011 | ||
1012 | default: | |
1013 | assert_not_reached("Uh, control process died at wrong time."); | |
1014 | } | |
1015 | ||
1016 | /* Notify clients about changed exit status */ | |
1017 | unit_add_to_dbus_queue(u); | |
e04aad61 LP |
1018 | } |
1019 | ||
718db961 LP |
1020 | static int swap_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) { |
1021 | Swap *s = SWAP(userdata); | |
e04aad61 LP |
1022 | |
1023 | assert(s); | |
718db961 | 1024 | assert(s->timer_event_source == source); |
e04aad61 LP |
1025 | |
1026 | switch (s->state) { | |
1027 | ||
1028 | case SWAP_ACTIVATING: | |
5bcb0f2b | 1029 | case SWAP_ACTIVATING_DONE: |
f2341e0a | 1030 | log_unit_warning(UNIT(s), "Activation timed out. Stopping."); |
e1770af8 | 1031 | swap_enter_signal(s, SWAP_ACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT); |
e04aad61 LP |
1032 | break; |
1033 | ||
1034 | case SWAP_DEACTIVATING: | |
f2341e0a | 1035 | log_unit_warning(UNIT(s), "Deactivation timed out. Stopping."); |
e1770af8 | 1036 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT); |
e04aad61 LP |
1037 | break; |
1038 | ||
1039 | case SWAP_ACTIVATING_SIGTERM: | |
4819ff03 | 1040 | if (s->kill_context.send_sigkill) { |
f2341e0a | 1041 | log_unit_warning(UNIT(s), "Activation timed out. Killing."); |
e1770af8 | 1042 | swap_enter_signal(s, SWAP_ACTIVATING_SIGKILL, SWAP_FAILURE_TIMEOUT); |
ba035df2 | 1043 | } else { |
f2341e0a | 1044 | log_unit_warning(UNIT(s), "Activation timed out. Skipping SIGKILL. Ignoring."); |
e1770af8 | 1045 | swap_enter_dead(s, SWAP_FAILURE_TIMEOUT); |
ba035df2 | 1046 | } |
e04aad61 LP |
1047 | break; |
1048 | ||
1049 | case SWAP_DEACTIVATING_SIGTERM: | |
4819ff03 | 1050 | if (s->kill_context.send_sigkill) { |
f2341e0a | 1051 | log_unit_warning(UNIT(s), "Deactivation timed out. Killing."); |
e1770af8 | 1052 | swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, SWAP_FAILURE_TIMEOUT); |
ba035df2 | 1053 | } else { |
f2341e0a | 1054 | log_unit_warning(UNIT(s), "Deactivation timed out. Skipping SIGKILL. Ignoring."); |
e1770af8 | 1055 | swap_enter_dead(s, SWAP_FAILURE_TIMEOUT); |
ba035df2 | 1056 | } |
e04aad61 LP |
1057 | break; |
1058 | ||
1059 | case SWAP_ACTIVATING_SIGKILL: | |
1060 | case SWAP_DEACTIVATING_SIGKILL: | |
f2341e0a | 1061 | log_unit_warning(UNIT(s), "Swap process still around after SIGKILL. Ignoring."); |
e1770af8 | 1062 | swap_enter_dead(s, SWAP_FAILURE_TIMEOUT); |
e04aad61 LP |
1063 | break; |
1064 | ||
1065 | default: | |
1066 | assert_not_reached("Timeout at wrong time."); | |
1067 | } | |
718db961 LP |
1068 | |
1069 | return 0; | |
e04aad61 LP |
1070 | } |
1071 | ||
1072 | static int swap_load_proc_swaps(Manager *m, bool set_flags) { | |
1073 | unsigned i; | |
1074 | int r = 0; | |
1075 | ||
1076 | assert(m); | |
1077 | ||
07b0b134 | 1078 | rewind(m->proc_swaps); |
bab45044 | 1079 | |
4e85aff4 | 1080 | (void) fscanf(m->proc_swaps, "%*s %*s %*s %*s %*s\n"); |
07b0b134 | 1081 | |
e04aad61 | 1082 | for (i = 1;; i++) { |
9fb3675e | 1083 | _cleanup_free_ char *dev = NULL, *d = NULL; |
07b0b134 ML |
1084 | int prio = 0, k; |
1085 | ||
646134dc ZJS |
1086 | k = fscanf(m->proc_swaps, |
1087 | "%ms " /* device/file */ | |
1088 | "%*s " /* type of swap */ | |
1089 | "%*s " /* swap size */ | |
1090 | "%*s " /* used */ | |
1091 | "%i\n", /* priority */ | |
1092 | &dev, &prio); | |
1093 | if (k != 2) { | |
07b0b134 | 1094 | if (k == EOF) |
4e85aff4 | 1095 | break; |
07b0b134 | 1096 | |
628c89cc | 1097 | log_warning("Failed to parse /proc/swaps:%u.", i); |
e04aad61 | 1098 | continue; |
07b0b134 | 1099 | } |
07b0b134 | 1100 | |
527b7a42 | 1101 | if (cunescape(dev, UNESCAPE_RELAX, &d) < 0) |
628c89cc LP |
1102 | return log_oom(); |
1103 | ||
1104 | device_found_node(m, d, true, DEVICE_FOUND_SWAP, set_flags); | |
4e85aff4 | 1105 | |
628c89cc | 1106 | k = swap_process_new(m, d, prio, set_flags); |
07b0b134 | 1107 | if (k < 0) |
e04aad61 | 1108 | r = k; |
07b0b134 ML |
1109 | } |
1110 | ||
e04aad61 LP |
1111 | return r; |
1112 | } | |
1113 | ||
718db961 LP |
1114 | static int swap_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) { |
1115 | Manager *m = userdata; | |
595ed347 | 1116 | Unit *u; |
4e434314 LP |
1117 | int r; |
1118 | ||
1119 | assert(m); | |
718db961 | 1120 | assert(revents & EPOLLPRI); |
4e434314 | 1121 | |
646134dc ZJS |
1122 | r = swap_load_proc_swaps(m, true); |
1123 | if (r < 0) { | |
da927ba9 | 1124 | log_error_errno(r, "Failed to reread /proc/swaps: %m"); |
e04aad61 LP |
1125 | |
1126 | /* Reset flags, just in case, for late calls */ | |
595ed347 MS |
1127 | LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) { |
1128 | Swap *swap = SWAP(u); | |
e04aad61 LP |
1129 | |
1130 | swap->is_active = swap->just_activated = false; | |
1131 | } | |
1132 | ||
1133 | return 0; | |
1134 | } | |
1135 | ||
1136 | manager_dispatch_load_queue(m); | |
1137 | ||
595ed347 MS |
1138 | LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) { |
1139 | Swap *swap = SWAP(u); | |
e04aad61 LP |
1140 | |
1141 | if (!swap->is_active) { | |
1142 | /* This has just been deactivated */ | |
1143 | ||
e04aad61 LP |
1144 | swap_unset_proc_swaps(swap); |
1145 | ||
1146 | switch (swap->state) { | |
1147 | ||
1148 | case SWAP_ACTIVE: | |
e1770af8 | 1149 | swap_enter_dead(swap, SWAP_SUCCESS); |
e04aad61 LP |
1150 | break; |
1151 | ||
1152 | default: | |
5bcb0f2b | 1153 | /* Fire again */ |
e04aad61 LP |
1154 | swap_set_state(swap, swap->state); |
1155 | break; | |
1156 | } | |
1157 | ||
628c89cc LP |
1158 | if (swap->what) |
1159 | device_found_node(m, swap->what, false, DEVICE_FOUND_SWAP, true); | |
1160 | ||
e04aad61 LP |
1161 | } else if (swap->just_activated) { |
1162 | ||
1163 | /* New swap entry */ | |
1164 | ||
1165 | switch (swap->state) { | |
1166 | ||
1167 | case SWAP_DEAD: | |
1168 | case SWAP_FAILED: | |
e1770af8 | 1169 | swap_enter_active(swap, SWAP_SUCCESS); |
e04aad61 LP |
1170 | break; |
1171 | ||
5bcb0f2b LP |
1172 | case SWAP_ACTIVATING: |
1173 | swap_set_state(swap, SWAP_ACTIVATING_DONE); | |
1174 | break; | |
1175 | ||
e04aad61 LP |
1176 | default: |
1177 | /* Nothing really changed, but let's | |
1178 | * issue an notification call | |
1179 | * nonetheless, in case somebody is | |
1180 | * waiting for this. */ | |
1181 | swap_set_state(swap, swap->state); | |
1182 | break; | |
1183 | } | |
1184 | } | |
1185 | ||
1186 | /* Reset the flags for later calls */ | |
1187 | swap->is_active = swap->just_activated = false; | |
1188 | } | |
1189 | ||
1190 | return 1; | |
1191 | } | |
1192 | ||
1193 | static Unit *swap_following(Unit *u) { | |
1194 | Swap *s = SWAP(u); | |
1195 | Swap *other, *first = NULL; | |
1196 | ||
1197 | assert(s); | |
1198 | ||
cdc89820 ZJS |
1199 | /* If the user configured the swap through /etc/fstab or |
1200 | * a device unit, follow that. */ | |
1201 | ||
1202 | if (s->from_fragment) | |
e04aad61 LP |
1203 | return NULL; |
1204 | ||
caac2704 | 1205 | LIST_FOREACH_OTHERS(same_devnode, other, s) |
cdc89820 ZJS |
1206 | if (other->from_fragment) |
1207 | return UNIT(other); | |
1208 | ||
b938cb90 | 1209 | /* Otherwise, make everybody follow the unit that's named after |
cdc89820 ZJS |
1210 | * the swap device in the kernel */ |
1211 | ||
1212 | if (streq_ptr(s->what, s->devnode)) | |
1213 | return NULL; | |
e04aad61 | 1214 | |
9670d583 LP |
1215 | LIST_FOREACH_AFTER(same_devnode, other, s) |
1216 | if (streq_ptr(other->what, other->devnode)) | |
e04aad61 LP |
1217 | return UNIT(other); |
1218 | ||
9670d583 LP |
1219 | LIST_FOREACH_BEFORE(same_devnode, other, s) { |
1220 | if (streq_ptr(other->what, other->devnode)) | |
e04aad61 LP |
1221 | return UNIT(other); |
1222 | ||
1223 | first = other; | |
1224 | } | |
1225 | ||
cdc89820 | 1226 | /* Fall back to the first on the list */ |
e04aad61 | 1227 | return UNIT(first); |
07b0b134 ML |
1228 | } |
1229 | ||
6210e7fc | 1230 | static int swap_following_set(Unit *u, Set **_set) { |
5bcb0f2b | 1231 | Swap *s = SWAP(u), *other; |
6210e7fc LP |
1232 | Set *set; |
1233 | int r; | |
1234 | ||
1235 | assert(s); | |
1236 | assert(_set); | |
1237 | ||
9670d583 | 1238 | if (LIST_JUST_US(same_devnode, s)) { |
6210e7fc LP |
1239 | *_set = NULL; |
1240 | return 0; | |
1241 | } | |
1242 | ||
d5099efc | 1243 | set = set_new(NULL); |
5bcb0f2b | 1244 | if (!set) |
6210e7fc LP |
1245 | return -ENOMEM; |
1246 | ||
caac2704 | 1247 | LIST_FOREACH_OTHERS(same_devnode, other, s) { |
5bcb0f2b LP |
1248 | r = set_put(set, other); |
1249 | if (r < 0) | |
6210e7fc | 1250 | goto fail; |
5bcb0f2b | 1251 | } |
6210e7fc LP |
1252 | |
1253 | *_set = set; | |
1254 | return 1; | |
1255 | ||
1256 | fail: | |
1257 | set_free(set); | |
1258 | return r; | |
1259 | } | |
1260 | ||
07b0b134 ML |
1261 | static void swap_shutdown(Manager *m) { |
1262 | assert(m); | |
1263 | ||
718db961 LP |
1264 | m->swap_event_source = sd_event_source_unref(m->swap_event_source); |
1265 | ||
74ca738f | 1266 | m->proc_swaps = safe_fclose(m->proc_swaps); |
e04aad61 | 1267 | |
525d3cc7 | 1268 | m->swaps_by_devnode = hashmap_free(m->swaps_by_devnode); |
07b0b134 ML |
1269 | } |
1270 | ||
07b0b134 ML |
1271 | static int swap_enumerate(Manager *m) { |
1272 | int r; | |
9670d583 | 1273 | |
07b0b134 ML |
1274 | assert(m); |
1275 | ||
4e434314 | 1276 | if (!m->proc_swaps) { |
646134dc ZJS |
1277 | m->proc_swaps = fopen("/proc/swaps", "re"); |
1278 | if (!m->proc_swaps) | |
718db961 | 1279 | return errno == ENOENT ? 0 : -errno; |
4e434314 | 1280 | |
151b9b96 | 1281 | r = sd_event_add_io(m->event, &m->swap_event_source, fileno(m->proc_swaps), EPOLLPRI, swap_dispatch_io, m); |
718db961 | 1282 | if (r < 0) |
29083707 LP |
1283 | goto fail; |
1284 | ||
1285 | /* Dispatch this before we dispatch SIGCHLD, so that | |
1286 | * we always get the events from /proc/swaps before | |
1287 | * the SIGCHLD of /sbin/swapon. */ | |
1288 | r = sd_event_source_set_priority(m->swap_event_source, -10); | |
1289 | if (r < 0) | |
718db961 | 1290 | goto fail; |
7dfbe2e3 TG |
1291 | |
1292 | (void) sd_event_source_set_description(m->swap_event_source, "swap-proc"); | |
4e434314 LP |
1293 | } |
1294 | ||
646134dc ZJS |
1295 | r = swap_load_proc_swaps(m, false); |
1296 | if (r < 0) | |
718db961 LP |
1297 | goto fail; |
1298 | ||
1299 | return 0; | |
07b0b134 | 1300 | |
718db961 LP |
1301 | fail: |
1302 | swap_shutdown(m); | |
07b0b134 ML |
1303 | return r; |
1304 | } | |
1305 | ||
628c89cc | 1306 | int swap_process_device_new(Manager *m, struct udev_device *dev) { |
9670d583 LP |
1307 | struct udev_list_entry *item = NULL, *first = NULL; |
1308 | _cleanup_free_ char *e = NULL; | |
1309 | const char *dn; | |
1310 | Swap *s; | |
1311 | int r = 0; | |
1312 | ||
1313 | assert(m); | |
1314 | assert(dev); | |
1315 | ||
1316 | dn = udev_device_get_devnode(dev); | |
1317 | if (!dn) | |
1318 | return 0; | |
1319 | ||
7410616c LP |
1320 | r = unit_name_from_path(dn, ".swap", &e); |
1321 | if (r < 0) | |
1322 | return r; | |
9670d583 LP |
1323 | |
1324 | s = hashmap_get(m->units, e); | |
1325 | if (s) | |
1326 | r = swap_set_devnode(s, dn); | |
1327 | ||
1328 | first = udev_device_get_devlinks_list_entry(dev); | |
1329 | udev_list_entry_foreach(item, first) { | |
1330 | _cleanup_free_ char *n = NULL; | |
7410616c | 1331 | int q; |
9670d583 | 1332 | |
7410616c LP |
1333 | q = unit_name_from_path(udev_list_entry_get_name(item), ".swap", &n); |
1334 | if (q < 0) | |
1335 | return q; | |
9670d583 LP |
1336 | |
1337 | s = hashmap_get(m->units, n); | |
1338 | if (s) { | |
9670d583 LP |
1339 | q = swap_set_devnode(s, dn); |
1340 | if (q < 0) | |
1341 | r = q; | |
1342 | } | |
1343 | } | |
1344 | ||
1345 | return r; | |
1346 | } | |
1347 | ||
628c89cc | 1348 | int swap_process_device_remove(Manager *m, struct udev_device *dev) { |
9670d583 LP |
1349 | const char *dn; |
1350 | int r = 0; | |
1351 | Swap *s; | |
1352 | ||
1353 | dn = udev_device_get_devnode(dev); | |
1354 | if (!dn) | |
1355 | return 0; | |
1356 | ||
1357 | while ((s = hashmap_get(m->swaps_by_devnode, dn))) { | |
1358 | int q; | |
1359 | ||
1360 | q = swap_set_devnode(s, NULL); | |
1361 | if (q < 0) | |
1362 | r = q; | |
1363 | } | |
1364 | ||
1365 | return r; | |
1366 | } | |
1367 | ||
fdf20a31 | 1368 | static void swap_reset_failed(Unit *u) { |
5632e374 LP |
1369 | Swap *s = SWAP(u); |
1370 | ||
1371 | assert(s); | |
1372 | ||
fdf20a31 | 1373 | if (s->state == SWAP_FAILED) |
5632e374 | 1374 | swap_set_state(s, SWAP_DEAD); |
e04aad61 | 1375 | |
e1770af8 | 1376 | s->result = SWAP_SUCCESS; |
5632e374 LP |
1377 | } |
1378 | ||
718db961 | 1379 | static int swap_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) { |
814cc562 | 1380 | return unit_kill_common(u, who, signo, -1, SWAP(u)->control_pid, error); |
8a0867d6 LP |
1381 | } |
1382 | ||
68db7a3b ZJS |
1383 | static int swap_get_timeout(Unit *u, uint64_t *timeout) { |
1384 | Swap *s = SWAP(u); | |
1385 | int r; | |
1386 | ||
1387 | if (!s->timer_event_source) | |
1388 | return 0; | |
1389 | ||
1390 | r = sd_event_source_get_time(s->timer_event_source, timeout); | |
1391 | if (r < 0) | |
1392 | return r; | |
1393 | ||
1394 | return 1; | |
1395 | } | |
1396 | ||
1c2e9646 | 1397 | static bool swap_supported(void) { |
0faacd47 LP |
1398 | static int supported = -1; |
1399 | ||
1400 | /* If swap support is not available in the kernel, or we are | |
1401 | * running in a container we don't support swap units, and any | |
1402 | * attempts to starting one should fail immediately. */ | |
1403 | ||
1404 | if (supported < 0) | |
1405 | supported = | |
1406 | access("/proc/swaps", F_OK) >= 0 && | |
75f86906 | 1407 | detect_container() <= 0; |
0faacd47 LP |
1408 | |
1409 | return supported; | |
1410 | } | |
1411 | ||
e04aad61 LP |
1412 | static const char* const swap_exec_command_table[_SWAP_EXEC_COMMAND_MAX] = { |
1413 | [SWAP_EXEC_ACTIVATE] = "ExecActivate", | |
1414 | [SWAP_EXEC_DEACTIVATE] = "ExecDeactivate", | |
1415 | }; | |
1416 | ||
1417 | DEFINE_STRING_TABLE_LOOKUP(swap_exec_command, SwapExecCommand); | |
1418 | ||
e1770af8 LP |
1419 | static const char* const swap_result_table[_SWAP_RESULT_MAX] = { |
1420 | [SWAP_SUCCESS] = "success", | |
1421 | [SWAP_FAILURE_RESOURCES] = "resources", | |
1422 | [SWAP_FAILURE_TIMEOUT] = "timeout", | |
1423 | [SWAP_FAILURE_EXIT_CODE] = "exit-code", | |
1424 | [SWAP_FAILURE_SIGNAL] = "signal", | |
1425 | [SWAP_FAILURE_CORE_DUMP] = "core-dump" | |
1426 | }; | |
1427 | ||
1428 | DEFINE_STRING_TABLE_LOOKUP(swap_result, SwapResult); | |
1429 | ||
07b0b134 | 1430 | const UnitVTable swap_vtable = { |
7d17cfbc | 1431 | .object_size = sizeof(Swap), |
718db961 LP |
1432 | .exec_context_offset = offsetof(Swap, exec_context), |
1433 | .cgroup_context_offset = offsetof(Swap, cgroup_context), | |
1434 | .kill_context_offset = offsetof(Swap, kill_context), | |
613b411c | 1435 | .exec_runtime_offset = offsetof(Swap, exec_runtime), |
3ef63c31 | 1436 | |
f975e971 LP |
1437 | .sections = |
1438 | "Unit\0" | |
1439 | "Swap\0" | |
1440 | "Install\0", | |
4ad49000 | 1441 | .private_section = "Swap", |
71645aca | 1442 | |
e04aad61 | 1443 | .no_alias = true, |
07b0b134 ML |
1444 | .no_instances = true, |
1445 | ||
4e85aff4 | 1446 | .init = swap_init, |
07b0b134 | 1447 | .load = swap_load, |
6e620bec | 1448 | .done = swap_done, |
07b0b134 ML |
1449 | |
1450 | .coldplug = swap_coldplug, | |
1451 | ||
1452 | .dump = swap_dump, | |
1453 | ||
1454 | .start = swap_start, | |
1455 | .stop = swap_stop, | |
1456 | ||
8a0867d6 LP |
1457 | .kill = swap_kill, |
1458 | ||
68db7a3b ZJS |
1459 | .get_timeout = swap_get_timeout, |
1460 | ||
07b0b134 ML |
1461 | .serialize = swap_serialize, |
1462 | .deserialize_item = swap_deserialize_item, | |
1463 | ||
1464 | .active_state = swap_active_state, | |
1465 | .sub_state_to_string = swap_sub_state_to_string, | |
1466 | ||
1467 | .check_gc = swap_check_gc, | |
1468 | ||
e04aad61 | 1469 | .sigchld_event = swap_sigchld_event, |
e04aad61 LP |
1470 | |
1471 | .reset_failed = swap_reset_failed, | |
1472 | ||
718db961 | 1473 | .bus_vtable = bus_swap_vtable, |
74c964d3 LP |
1474 | .bus_set_property = bus_swap_set_property, |
1475 | .bus_commit_properties = bus_swap_commit_properties, | |
07b0b134 | 1476 | |
e04aad61 | 1477 | .following = swap_following, |
6210e7fc | 1478 | .following_set = swap_following_set, |
5632e374 | 1479 | |
6e620bec | 1480 | .enumerate = swap_enumerate, |
c6918296 | 1481 | .shutdown = swap_shutdown, |
0faacd47 | 1482 | .supported = swap_supported, |
c6918296 MS |
1483 | |
1484 | .status_message_formats = { | |
1485 | .starting_stopping = { | |
1486 | [0] = "Activating swap %s...", | |
1487 | [1] = "Deactivating swap %s...", | |
1488 | }, | |
1489 | .finished_start_job = { | |
1490 | [JOB_DONE] = "Activated swap %s.", | |
1491 | [JOB_FAILED] = "Failed to activate swap %s.", | |
c6918296 MS |
1492 | [JOB_TIMEOUT] = "Timed out activating swap %s.", |
1493 | }, | |
1494 | .finished_stop_job = { | |
1495 | [JOB_DONE] = "Deactivated swap %s.", | |
1496 | [JOB_FAILED] = "Failed deactivating swap %s.", | |
1497 | [JOB_TIMEOUT] = "Timed out deactivating swap %s.", | |
1498 | }, | |
1499 | }, | |
07b0b134 | 1500 | }; |