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