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d6c9574f | 1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
8e274523 LP |
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 | |
8e274523 LP |
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. |
8e274523 | 17 | |
5430f7f2 | 18 | You should have received a copy of the GNU Lesser General Public License |
8e274523 LP |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
20 | ***/ | |
21 | ||
22 | #include <errno.h> | |
23 | #include <assert.h> | |
24 | #include <unistd.h> | |
25 | #include <sys/types.h> | |
26 | #include <signal.h> | |
27 | #include <sys/mount.h> | |
c6c18be3 | 28 | #include <fcntl.h> |
8c6db833 | 29 | |
8e274523 | 30 | #include "cgroup.h" |
8c6db833 | 31 | #include "cgroup-util.h" |
8e274523 LP |
32 | #include "log.h" |
33 | ||
8e274523 LP |
34 | int cgroup_bonding_realize(CGroupBonding *b) { |
35 | int r; | |
36 | ||
37 | assert(b); | |
38 | assert(b->path); | |
39 | assert(b->controller); | |
40 | ||
ab1f0633 LP |
41 | r = cg_create(b->controller, b->path); |
42 | if (r < 0) { | |
43 | log_warning("Failed to create cgroup %s:%s: %s", b->controller, b->path, strerror(-r)); | |
8c6db833 | 44 | return r; |
ab1f0633 | 45 | } |
8e274523 | 46 | |
8c6db833 | 47 | b->realized = true; |
8e274523 | 48 | |
8e274523 | 49 | return 0; |
8e274523 LP |
50 | } |
51 | ||
52 | int cgroup_bonding_realize_list(CGroupBonding *first) { | |
53 | CGroupBonding *b; | |
8c6db833 | 54 | int r; |
8e274523 | 55 | |
8c6db833 | 56 | LIST_FOREACH(by_unit, b, first) |
d686d8a9 | 57 | if ((r = cgroup_bonding_realize(b)) < 0 && b->essential) |
8e274523 | 58 | return r; |
8e274523 LP |
59 | |
60 | return 0; | |
61 | } | |
62 | ||
8d53b453 | 63 | void cgroup_bonding_free(CGroupBonding *b, bool trim) { |
8e274523 LP |
64 | assert(b); |
65 | ||
66 | if (b->unit) { | |
67 | CGroupBonding *f; | |
68 | ||
ac155bb8 | 69 | LIST_REMOVE(CGroupBonding, by_unit, b->unit->cgroup_bondings, b); |
8e274523 | 70 | |
d686d8a9 | 71 | if (streq(b->controller, SYSTEMD_CGROUP_CONTROLLER)) { |
ac155bb8 | 72 | assert_se(f = hashmap_get(b->unit->manager->cgroup_bondings, b->path)); |
d686d8a9 | 73 | LIST_REMOVE(CGroupBonding, by_path, f, b); |
8e274523 | 74 | |
d686d8a9 | 75 | if (f) |
ac155bb8 | 76 | hashmap_replace(b->unit->manager->cgroup_bondings, b->path, f); |
d686d8a9 | 77 | else |
ac155bb8 | 78 | hashmap_remove(b->unit->manager->cgroup_bondings, b->path); |
d686d8a9 | 79 | } |
8e274523 LP |
80 | } |
81 | ||
8d53b453 LP |
82 | if (b->realized && b->ours && trim) |
83 | cg_trim(b->controller, b->path, false); | |
8e274523 | 84 | |
c9106f61 LP |
85 | free(b->controller); |
86 | free(b->path); | |
8e274523 LP |
87 | free(b); |
88 | } | |
89 | ||
38c52d46 | 90 | void cgroup_bonding_free_list(CGroupBonding *first, bool remove_or_trim) { |
8e274523 LP |
91 | CGroupBonding *b, *n; |
92 | ||
93 | LIST_FOREACH_SAFE(by_unit, b, n, first) | |
38c52d46 | 94 | cgroup_bonding_free(b, remove_or_trim); |
8e274523 LP |
95 | } |
96 | ||
fb385181 LP |
97 | void cgroup_bonding_trim(CGroupBonding *b, bool delete_root) { |
98 | assert(b); | |
99 | ||
d686d8a9 | 100 | if (b->realized && b->ours) |
fb385181 LP |
101 | cg_trim(b->controller, b->path, delete_root); |
102 | } | |
103 | ||
104 | void cgroup_bonding_trim_list(CGroupBonding *first, bool delete_root) { | |
105 | CGroupBonding *b; | |
106 | ||
107 | LIST_FOREACH(by_unit, b, first) | |
108 | cgroup_bonding_trim(b, delete_root); | |
109 | } | |
110 | ||
8e274523 LP |
111 | int cgroup_bonding_install(CGroupBonding *b, pid_t pid) { |
112 | int r; | |
113 | ||
114 | assert(b); | |
115 | assert(pid >= 0); | |
116 | ||
8c6db833 LP |
117 | if ((r = cg_create_and_attach(b->controller, b->path, pid)) < 0) |
118 | return r; | |
8e274523 | 119 | |
8c6db833 | 120 | b->realized = true; |
8e274523 LP |
121 | return 0; |
122 | } | |
123 | ||
124 | int cgroup_bonding_install_list(CGroupBonding *first, pid_t pid) { | |
125 | CGroupBonding *b; | |
8c6db833 | 126 | int r; |
8e274523 | 127 | |
8c6db833 | 128 | LIST_FOREACH(by_unit, b, first) |
d686d8a9 | 129 | if ((r = cgroup_bonding_install(b, pid)) < 0 && b->essential) |
8e274523 | 130 | return r; |
8e274523 LP |
131 | |
132 | return 0; | |
133 | } | |
134 | ||
64747e2d LP |
135 | int cgroup_bonding_set_group_access(CGroupBonding *b, mode_t mode, uid_t uid, gid_t gid) { |
136 | assert(b); | |
137 | ||
138 | if (!b->realized) | |
139 | return -EINVAL; | |
140 | ||
141 | return cg_set_group_access(b->controller, b->path, mode, uid, gid); | |
142 | } | |
143 | ||
144 | int cgroup_bonding_set_group_access_list(CGroupBonding *first, mode_t mode, uid_t uid, gid_t gid) { | |
145 | CGroupBonding *b; | |
146 | int r; | |
147 | ||
148 | LIST_FOREACH(by_unit, b, first) { | |
149 | r = cgroup_bonding_set_group_access(b, mode, uid, gid); | |
150 | if (r < 0) | |
151 | return r; | |
152 | } | |
153 | ||
154 | return 0; | |
155 | } | |
156 | ||
8d53b453 | 157 | int cgroup_bonding_set_task_access(CGroupBonding *b, mode_t mode, uid_t uid, gid_t gid, int sticky) { |
64747e2d LP |
158 | assert(b); |
159 | ||
160 | if (!b->realized) | |
161 | return -EINVAL; | |
162 | ||
8d53b453 | 163 | return cg_set_task_access(b->controller, b->path, mode, uid, gid, sticky); |
64747e2d LP |
164 | } |
165 | ||
8d53b453 | 166 | int cgroup_bonding_set_task_access_list(CGroupBonding *first, mode_t mode, uid_t uid, gid_t gid, int sticky) { |
64747e2d LP |
167 | CGroupBonding *b; |
168 | int r; | |
169 | ||
170 | LIST_FOREACH(by_unit, b, first) { | |
8d53b453 | 171 | r = cgroup_bonding_set_task_access(b, mode, uid, gid, sticky); |
64747e2d LP |
172 | if (r < 0) |
173 | return r; | |
174 | } | |
175 | ||
176 | return 0; | |
177 | } | |
178 | ||
430c18ed | 179 | int cgroup_bonding_kill(CGroupBonding *b, int sig, bool sigcont, Set *s) { |
8e274523 | 180 | assert(b); |
8c6db833 | 181 | assert(sig >= 0); |
8e274523 | 182 | |
d686d8a9 | 183 | /* Don't kill cgroups that aren't ours */ |
31e54cc8 | 184 | if (!b->ours) |
d686d8a9 | 185 | return 0; |
8c6db833 | 186 | |
430c18ed | 187 | return cg_kill_recursive(b->controller, b->path, sig, sigcont, true, false, s); |
8e274523 LP |
188 | } |
189 | ||
430c18ed | 190 | int cgroup_bonding_kill_list(CGroupBonding *first, int sig, bool sigcont, Set *s) { |
8e274523 | 191 | CGroupBonding *b; |
ca949c9d LP |
192 | Set *allocated_set = NULL; |
193 | int ret = -EAGAIN, r; | |
194 | ||
8f53a7b8 LP |
195 | if (!first) |
196 | return 0; | |
197 | ||
ca949c9d LP |
198 | if (!s) |
199 | if (!(s = allocated_set = set_new(trivial_hash_func, trivial_compare_func))) | |
200 | return -ENOMEM; | |
8e274523 LP |
201 | |
202 | LIST_FOREACH(by_unit, b, first) { | |
430c18ed | 203 | if ((r = cgroup_bonding_kill(b, sig, sigcont, s)) < 0) { |
8c6db833 | 204 | if (r == -EAGAIN || r == -ESRCH) |
50159e6a | 205 | continue; |
8e274523 | 206 | |
ca949c9d LP |
207 | ret = r; |
208 | goto finish; | |
50159e6a LP |
209 | } |
210 | ||
ca949c9d LP |
211 | if (ret < 0 || r > 0) |
212 | ret = r; | |
8e274523 LP |
213 | } |
214 | ||
ca949c9d LP |
215 | finish: |
216 | if (allocated_set) | |
217 | set_free(allocated_set); | |
218 | ||
219 | return ret; | |
8e274523 LP |
220 | } |
221 | ||
222 | /* Returns 1 if the group is empty, 0 if it is not, -EAGAIN if we | |
223 | * cannot know */ | |
224 | int cgroup_bonding_is_empty(CGroupBonding *b) { | |
8e274523 LP |
225 | int r; |
226 | ||
227 | assert(b); | |
228 | ||
8c6db833 LP |
229 | if ((r = cg_is_empty_recursive(b->controller, b->path, true)) < 0) |
230 | return r; | |
8e274523 | 231 | |
8c6db833 LP |
232 | /* If it is empty it is empty */ |
233 | if (r > 0) | |
8e274523 LP |
234 | return 1; |
235 | ||
8c6db833 | 236 | /* It's not only us using this cgroup, so we just don't know */ |
d686d8a9 | 237 | return b->ours ? 0 : -EAGAIN; |
8e274523 LP |
238 | } |
239 | ||
240 | int cgroup_bonding_is_empty_list(CGroupBonding *first) { | |
241 | CGroupBonding *b; | |
242 | ||
243 | LIST_FOREACH(by_unit, b, first) { | |
244 | int r; | |
245 | ||
246 | if ((r = cgroup_bonding_is_empty(b)) < 0) { | |
247 | /* If this returned -EAGAIN, then we don't know if the | |
248 | * group is empty, so let's see if another group can | |
249 | * tell us */ | |
250 | ||
251 | if (r != -EAGAIN) | |
252 | return r; | |
253 | } else | |
254 | return r; | |
255 | } | |
256 | ||
257 | return -EAGAIN; | |
258 | } | |
259 | ||
8e274523 | 260 | int manager_setup_cgroup(Manager *m) { |
c6c18be3 | 261 | char *current = NULL, *path = NULL; |
8e274523 | 262 | int r; |
7ccfb64a | 263 | char suffix[32]; |
8e274523 LP |
264 | |
265 | assert(m); | |
266 | ||
e5a53dc7 | 267 | /* 0. Be nice to Ingo Molnar #628004 */ |
0c85a4f3 | 268 | if (path_is_mount_point("/sys/fs/cgroup/systemd", false) <= 0) { |
e5a53dc7 LP |
269 | log_warning("No control group support available, not creating root group."); |
270 | return 0; | |
271 | } | |
272 | ||
35d2e7ec | 273 | /* 1. Determine hierarchy */ |
12235040 LP |
274 | if ((r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 0, ¤t)) < 0) { |
275 | log_error("Cannot determine cgroup we are running in: %s", strerror(-r)); | |
c6c18be3 | 276 | goto finish; |
12235040 | 277 | } |
8e274523 | 278 | |
0baf24dd LP |
279 | if (m->running_as == MANAGER_SYSTEM) |
280 | strcpy(suffix, "/system"); | |
281 | else { | |
282 | snprintf(suffix, sizeof(suffix), "/systemd-%lu", (unsigned long) getpid()); | |
283 | char_array_0(suffix); | |
284 | } | |
7ccfb64a | 285 | |
8e274523 | 286 | free(m->cgroup_hierarchy); |
c6c18be3 | 287 | if (endswith(current, suffix)) { |
7ccfb64a | 288 | /* We probably got reexecuted and can continue to use our root cgroup */ |
c6c18be3 LP |
289 | m->cgroup_hierarchy = current; |
290 | current = NULL; | |
7ccfb64a | 291 | |
c6c18be3 LP |
292 | } else { |
293 | /* We need a new root cgroup */ | |
7ccfb64a | 294 | m->cgroup_hierarchy = NULL; |
e364ad06 | 295 | if (asprintf(&m->cgroup_hierarchy, "%s%s", streq(current, "/") ? "" : current, suffix) < 0) { |
12235040 | 296 | log_error("Out of memory"); |
c6c18be3 LP |
297 | r = -ENOMEM; |
298 | goto finish; | |
299 | } | |
8e274523 LP |
300 | } |
301 | ||
35d2e7ec | 302 | /* 2. Show data */ |
12235040 LP |
303 | if ((r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_hierarchy, NULL, &path)) < 0) { |
304 | log_error("Cannot find cgroup mount point: %s", strerror(-r)); | |
c6c18be3 | 305 | goto finish; |
12235040 | 306 | } |
8e274523 | 307 | |
c6c18be3 LP |
308 | log_debug("Using cgroup controller " SYSTEMD_CGROUP_CONTROLLER ". File system hierarchy is at %s.", path); |
309 | ||
35d2e7ec | 310 | /* 3. Install agent */ |
91901329 | 311 | if ((r = cg_install_release_agent(SYSTEMD_CGROUP_CONTROLLER, SYSTEMD_CGROUP_AGENT_PATH)) < 0) |
8e274523 | 312 | log_warning("Failed to install release agent, ignoring: %s", strerror(-r)); |
c6c18be3 LP |
313 | else if (r > 0) |
314 | log_debug("Installed release agent."); | |
8e274523 | 315 | else |
c6c18be3 | 316 | log_debug("Release agent already installed."); |
8e274523 | 317 | |
35d2e7ec | 318 | /* 4. Realize the group */ |
c6c18be3 | 319 | if ((r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_hierarchy, 0)) < 0) { |
8e274523 | 320 | log_error("Failed to create root cgroup hierarchy: %s", strerror(-r)); |
c6c18be3 LP |
321 | goto finish; |
322 | } | |
323 | ||
35d2e7ec | 324 | /* 5. And pin it, so that it cannot be unmounted */ |
c6c18be3 LP |
325 | if (m->pin_cgroupfs_fd >= 0) |
326 | close_nointr_nofail(m->pin_cgroupfs_fd); | |
327 | ||
328 | if ((m->pin_cgroupfs_fd = open(path, O_RDONLY|O_CLOEXEC|O_DIRECTORY|O_NOCTTY|O_NONBLOCK)) < 0) { | |
12235040 | 329 | log_error("Failed to open pin file: %m"); |
c6c18be3 LP |
330 | r = -errno; |
331 | goto finish; | |
332 | } | |
333 | ||
334 | log_debug("Created root group."); | |
335 | ||
336 | finish: | |
337 | free(current); | |
338 | free(path); | |
8e274523 LP |
339 | |
340 | return r; | |
341 | } | |
342 | ||
c6c18be3 | 343 | void manager_shutdown_cgroup(Manager *m, bool delete) { |
8e274523 LP |
344 | assert(m); |
345 | ||
c6c18be3 LP |
346 | if (delete && m->cgroup_hierarchy) |
347 | cg_delete(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_hierarchy); | |
8e274523 | 348 | |
c6c18be3 LP |
349 | if (m->pin_cgroupfs_fd >= 0) { |
350 | close_nointr_nofail(m->pin_cgroupfs_fd); | |
351 | m->pin_cgroupfs_fd = -1; | |
352 | } | |
353 | ||
354 | free(m->cgroup_hierarchy); | |
355 | m->cgroup_hierarchy = NULL; | |
8e274523 LP |
356 | } |
357 | ||
acb14d31 LP |
358 | int cgroup_bonding_get(Manager *m, const char *cgroup, CGroupBonding **bonding) { |
359 | CGroupBonding *b; | |
360 | char *p; | |
361 | ||
362 | assert(m); | |
363 | assert(cgroup); | |
364 | assert(bonding); | |
365 | ||
366 | b = hashmap_get(m->cgroup_bondings, cgroup); | |
5c72face | 367 | if (b) { |
acb14d31 LP |
368 | *bonding = b; |
369 | return 1; | |
370 | } | |
371 | ||
372 | p = strdup(cgroup); | |
373 | if (!p) | |
374 | return -ENOMEM; | |
375 | ||
376 | for (;;) { | |
377 | char *e; | |
378 | ||
379 | e = strrchr(p, '/'); | |
380 | if (!e || e == p) { | |
381 | free(p); | |
382 | *bonding = NULL; | |
383 | return 0; | |
384 | } | |
385 | ||
386 | *e = 0; | |
387 | ||
388 | b = hashmap_get(m->cgroup_bondings, p); | |
389 | if (b) { | |
390 | free(p); | |
391 | *bonding = b; | |
392 | return 1; | |
393 | } | |
394 | } | |
395 | } | |
396 | ||
8e274523 LP |
397 | int cgroup_notify_empty(Manager *m, const char *group) { |
398 | CGroupBonding *l, *b; | |
acb14d31 | 399 | int r; |
8e274523 LP |
400 | |
401 | assert(m); | |
402 | assert(group); | |
403 | ||
acb14d31 LP |
404 | r = cgroup_bonding_get(m, group, &l); |
405 | if (r <= 0) | |
406 | return r; | |
8e274523 LP |
407 | |
408 | LIST_FOREACH(by_path, b, l) { | |
409 | int t; | |
410 | ||
411 | if (!b->unit) | |
412 | continue; | |
413 | ||
353fa6a2 LP |
414 | t = cgroup_bonding_is_empty_list(b); |
415 | if (t < 0) { | |
8e274523 LP |
416 | |
417 | /* If we don't know, we don't know */ | |
418 | if (t != -EAGAIN) | |
419 | log_warning("Failed to check whether cgroup is empty: %s", strerror(errno)); | |
420 | ||
421 | continue; | |
422 | } | |
423 | ||
353fa6a2 LP |
424 | if (t > 0) { |
425 | /* If it is empty, let's delete it */ | |
ac155bb8 | 426 | cgroup_bonding_trim_list(b->unit->cgroup_bondings, true); |
353fa6a2 | 427 | |
8e274523 LP |
428 | if (UNIT_VTABLE(b->unit)->cgroup_notify_empty) |
429 | UNIT_VTABLE(b->unit)->cgroup_notify_empty(b->unit); | |
353fa6a2 | 430 | } |
8e274523 LP |
431 | } |
432 | ||
433 | return 0; | |
434 | } | |
435 | ||
8c47c732 LP |
436 | Unit* cgroup_unit_by_pid(Manager *m, pid_t pid) { |
437 | CGroupBonding *l, *b; | |
438 | char *group = NULL; | |
8c47c732 LP |
439 | |
440 | assert(m); | |
441 | ||
442 | if (pid <= 1) | |
443 | return NULL; | |
444 | ||
e364ad06 | 445 | if (cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, pid, &group) < 0) |
8c47c732 LP |
446 | return NULL; |
447 | ||
448 | l = hashmap_get(m->cgroup_bondings, group); | |
4455bcd0 LP |
449 | |
450 | if (!l) { | |
451 | char *slash; | |
452 | ||
453 | while ((slash = strrchr(group, '/'))) { | |
454 | if (slash == group) | |
455 | break; | |
456 | ||
457 | *slash = 0; | |
458 | ||
459 | if ((l = hashmap_get(m->cgroup_bondings, group))) | |
460 | break; | |
461 | } | |
462 | } | |
463 | ||
8c47c732 LP |
464 | free(group); |
465 | ||
8c47c732 LP |
466 | LIST_FOREACH(by_path, b, l) { |
467 | ||
468 | if (!b->unit) | |
469 | continue; | |
470 | ||
d686d8a9 | 471 | if (b->ours) |
8c47c732 LP |
472 | return b->unit; |
473 | } | |
474 | ||
475 | return NULL; | |
476 | } | |
477 | ||
8e274523 LP |
478 | CGroupBonding *cgroup_bonding_find_list(CGroupBonding *first, const char *controller) { |
479 | CGroupBonding *b; | |
480 | ||
481 | assert(controller); | |
482 | ||
483 | LIST_FOREACH(by_unit, b, first) | |
484 | if (streq(b->controller, controller)) | |
485 | return b; | |
486 | ||
487 | return NULL; | |
488 | } | |
6dde1f33 LP |
489 | |
490 | char *cgroup_bonding_to_string(CGroupBonding *b) { | |
491 | char *r; | |
492 | ||
493 | assert(b); | |
494 | ||
495 | if (asprintf(&r, "%s:%s", b->controller, b->path) < 0) | |
496 | return NULL; | |
497 | ||
498 | return r; | |
499 | } | |
4fbf50b3 LP |
500 | |
501 | pid_t cgroup_bonding_search_main_pid(CGroupBonding *b) { | |
502 | FILE *f; | |
2633eb83 | 503 | pid_t pid = 0, npid, mypid; |
4fbf50b3 LP |
504 | |
505 | assert(b); | |
506 | ||
d686d8a9 | 507 | if (!b->ours) |
4fbf50b3 LP |
508 | return 0; |
509 | ||
bd40a2d8 | 510 | if (cg_enumerate_processes(b->controller, b->path, &f) < 0) |
4fbf50b3 LP |
511 | return 0; |
512 | ||
2633eb83 LP |
513 | mypid = getpid(); |
514 | ||
bd40a2d8 | 515 | while (cg_read_pid(f, &npid) > 0) { |
2633eb83 | 516 | pid_t ppid; |
4fbf50b3 LP |
517 | |
518 | if (npid == pid) | |
519 | continue; | |
520 | ||
2633eb83 LP |
521 | /* Ignore processes that aren't our kids */ |
522 | if (get_parent_of_pid(npid, &ppid) >= 0 && ppid != mypid) | |
523 | continue; | |
524 | ||
4fbf50b3 | 525 | if (pid != 0) { |
2633eb83 LP |
526 | /* Dang, there's more than one daemonized PID |
527 | in this group, so we don't know what process | |
528 | is the main process. */ | |
4fbf50b3 LP |
529 | pid = 0; |
530 | break; | |
531 | } | |
532 | ||
533 | pid = npid; | |
534 | } | |
535 | ||
536 | fclose(f); | |
537 | ||
538 | return pid; | |
539 | } | |
540 | ||
541 | pid_t cgroup_bonding_search_main_pid_list(CGroupBonding *first) { | |
542 | CGroupBonding *b; | |
543 | pid_t pid; | |
544 | ||
545 | /* Try to find a main pid from this cgroup, but checking if | |
546 | * there's only one PID in the cgroup and returning it. Later | |
547 | * on we might want to add additional, smarter heuristics | |
548 | * here. */ | |
549 | ||
550 | LIST_FOREACH(by_unit, b, first) | |
551 | if ((pid = cgroup_bonding_search_main_pid(b)) != 0) | |
552 | return pid; | |
553 | ||
554 | return 0; | |
555 | ||
556 | } |