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