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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 | |
9 | under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
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 | |
16 | General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
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 | ||
8c6db833 | 41 | if (b->realized) |
8e274523 LP |
42 | return 0; |
43 | ||
8c6db833 LP |
44 | if ((r = cg_create(b->controller, b->path)) < 0) |
45 | return r; | |
8e274523 | 46 | |
8c6db833 | 47 | b->realized = true; |
8e274523 | 48 | |
d686d8a9 | 49 | if (b->ours) |
8c6db833 | 50 | cg_trim(b->controller, b->path, false); |
8e274523 LP |
51 | |
52 | return 0; | |
8e274523 LP |
53 | } |
54 | ||
55 | int cgroup_bonding_realize_list(CGroupBonding *first) { | |
56 | CGroupBonding *b; | |
8c6db833 | 57 | int r; |
8e274523 | 58 | |
8c6db833 | 59 | LIST_FOREACH(by_unit, b, first) |
d686d8a9 | 60 | if ((r = cgroup_bonding_realize(b)) < 0 && b->essential) |
8e274523 | 61 | return r; |
8e274523 LP |
62 | |
63 | return 0; | |
64 | } | |
65 | ||
66 | void cgroup_bonding_free(CGroupBonding *b) { | |
67 | assert(b); | |
68 | ||
69 | if (b->unit) { | |
70 | CGroupBonding *f; | |
71 | ||
72 | LIST_REMOVE(CGroupBonding, by_unit, b->unit->meta.cgroup_bondings, b); | |
73 | ||
d686d8a9 LP |
74 | if (streq(b->controller, SYSTEMD_CGROUP_CONTROLLER)) { |
75 | assert_se(f = hashmap_get(b->unit->meta.manager->cgroup_bondings, b->path)); | |
76 | LIST_REMOVE(CGroupBonding, by_path, f, b); | |
8e274523 | 77 | |
d686d8a9 LP |
78 | if (f) |
79 | hashmap_replace(b->unit->meta.manager->cgroup_bondings, b->path, f); | |
80 | else | |
81 | hashmap_remove(b->unit->meta.manager->cgroup_bondings, b->path); | |
82 | } | |
8e274523 LP |
83 | } |
84 | ||
d686d8a9 | 85 | if (b->realized && b->ours) { |
8e274523 | 86 | |
8c6db833 LP |
87 | if (cgroup_bonding_is_empty(b) > 0) |
88 | cg_delete(b->controller, b->path); | |
89 | else | |
90 | cg_trim(b->controller, b->path, false); | |
8e274523 LP |
91 | } |
92 | ||
c9106f61 LP |
93 | free(b->controller); |
94 | free(b->path); | |
8e274523 LP |
95 | free(b); |
96 | } | |
97 | ||
98 | void cgroup_bonding_free_list(CGroupBonding *first) { | |
99 | CGroupBonding *b, *n; | |
100 | ||
101 | LIST_FOREACH_SAFE(by_unit, b, n, first) | |
102 | cgroup_bonding_free(b); | |
103 | } | |
104 | ||
fb385181 LP |
105 | void cgroup_bonding_trim(CGroupBonding *b, bool delete_root) { |
106 | assert(b); | |
107 | ||
d686d8a9 | 108 | if (b->realized && b->ours) |
fb385181 LP |
109 | cg_trim(b->controller, b->path, delete_root); |
110 | } | |
111 | ||
112 | void cgroup_bonding_trim_list(CGroupBonding *first, bool delete_root) { | |
113 | CGroupBonding *b; | |
114 | ||
115 | LIST_FOREACH(by_unit, b, first) | |
116 | cgroup_bonding_trim(b, delete_root); | |
117 | } | |
118 | ||
8e274523 LP |
119 | int cgroup_bonding_install(CGroupBonding *b, pid_t pid) { |
120 | int r; | |
121 | ||
122 | assert(b); | |
123 | assert(pid >= 0); | |
124 | ||
8c6db833 LP |
125 | if ((r = cg_create_and_attach(b->controller, b->path, pid)) < 0) |
126 | return r; | |
8e274523 | 127 | |
8c6db833 | 128 | b->realized = true; |
8e274523 LP |
129 | return 0; |
130 | } | |
131 | ||
132 | int cgroup_bonding_install_list(CGroupBonding *first, pid_t pid) { | |
133 | CGroupBonding *b; | |
8c6db833 | 134 | int r; |
8e274523 | 135 | |
8c6db833 | 136 | LIST_FOREACH(by_unit, b, first) |
d686d8a9 | 137 | if ((r = cgroup_bonding_install(b, pid)) < 0 && b->essential) |
8e274523 | 138 | return r; |
8e274523 LP |
139 | |
140 | return 0; | |
141 | } | |
142 | ||
ca949c9d | 143 | int cgroup_bonding_kill(CGroupBonding *b, int sig, Set *s) { |
8e274523 | 144 | assert(b); |
8c6db833 | 145 | assert(sig >= 0); |
8e274523 | 146 | |
d686d8a9 LP |
147 | /* Don't kill cgroups that aren't ours */ |
148 | if (!b->realized || !b->ours) | |
149 | return 0; | |
8c6db833 | 150 | |
ca949c9d | 151 | return cg_kill_recursive(b->controller, b->path, sig, true, false, s); |
8e274523 LP |
152 | } |
153 | ||
ca949c9d | 154 | int cgroup_bonding_kill_list(CGroupBonding *first, int sig, Set *s) { |
8e274523 | 155 | CGroupBonding *b; |
ca949c9d LP |
156 | Set *allocated_set = NULL; |
157 | int ret = -EAGAIN, r; | |
158 | ||
159 | if (!s) | |
160 | if (!(s = allocated_set = set_new(trivial_hash_func, trivial_compare_func))) | |
161 | return -ENOMEM; | |
8e274523 LP |
162 | |
163 | LIST_FOREACH(by_unit, b, first) { | |
ca949c9d | 164 | if ((r = cgroup_bonding_kill(b, sig, s)) < 0) { |
8c6db833 | 165 | if (r == -EAGAIN || r == -ESRCH) |
50159e6a | 166 | continue; |
8e274523 | 167 | |
ca949c9d LP |
168 | ret = r; |
169 | goto finish; | |
50159e6a LP |
170 | } |
171 | ||
ca949c9d LP |
172 | if (ret < 0 || r > 0) |
173 | ret = r; | |
8e274523 LP |
174 | } |
175 | ||
ca949c9d LP |
176 | finish: |
177 | if (allocated_set) | |
178 | set_free(allocated_set); | |
179 | ||
180 | return ret; | |
8e274523 LP |
181 | } |
182 | ||
183 | /* Returns 1 if the group is empty, 0 if it is not, -EAGAIN if we | |
184 | * cannot know */ | |
185 | int cgroup_bonding_is_empty(CGroupBonding *b) { | |
8e274523 LP |
186 | int r; |
187 | ||
188 | assert(b); | |
189 | ||
8c6db833 LP |
190 | if ((r = cg_is_empty_recursive(b->controller, b->path, true)) < 0) |
191 | return r; | |
8e274523 | 192 | |
8c6db833 LP |
193 | /* If it is empty it is empty */ |
194 | if (r > 0) | |
8e274523 LP |
195 | return 1; |
196 | ||
8c6db833 | 197 | /* It's not only us using this cgroup, so we just don't know */ |
d686d8a9 | 198 | return b->ours ? 0 : -EAGAIN; |
8e274523 LP |
199 | } |
200 | ||
201 | int cgroup_bonding_is_empty_list(CGroupBonding *first) { | |
202 | CGroupBonding *b; | |
203 | ||
204 | LIST_FOREACH(by_unit, b, first) { | |
205 | int r; | |
206 | ||
207 | if ((r = cgroup_bonding_is_empty(b)) < 0) { | |
208 | /* If this returned -EAGAIN, then we don't know if the | |
209 | * group is empty, so let's see if another group can | |
210 | * tell us */ | |
211 | ||
212 | if (r != -EAGAIN) | |
213 | return r; | |
214 | } else | |
215 | return r; | |
216 | } | |
217 | ||
218 | return -EAGAIN; | |
219 | } | |
220 | ||
8e274523 | 221 | int manager_setup_cgroup(Manager *m) { |
c6c18be3 | 222 | char *current = NULL, *path = NULL; |
8e274523 | 223 | int r; |
7ccfb64a | 224 | char suffix[32]; |
8e274523 LP |
225 | |
226 | assert(m); | |
227 | ||
35d2e7ec | 228 | /* 1. Determine hierarchy */ |
c6c18be3 LP |
229 | if ((r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 0, ¤t)) < 0) |
230 | goto finish; | |
8e274523 | 231 | |
0baf24dd LP |
232 | if (m->running_as == MANAGER_SYSTEM) |
233 | strcpy(suffix, "/system"); | |
234 | else { | |
235 | snprintf(suffix, sizeof(suffix), "/systemd-%lu", (unsigned long) getpid()); | |
236 | char_array_0(suffix); | |
237 | } | |
7ccfb64a | 238 | |
8e274523 | 239 | free(m->cgroup_hierarchy); |
c6c18be3 | 240 | if (endswith(current, suffix)) { |
7ccfb64a | 241 | /* We probably got reexecuted and can continue to use our root cgroup */ |
c6c18be3 LP |
242 | m->cgroup_hierarchy = current; |
243 | current = NULL; | |
7ccfb64a | 244 | |
c6c18be3 LP |
245 | } else { |
246 | /* We need a new root cgroup */ | |
7ccfb64a | 247 | m->cgroup_hierarchy = NULL; |
e364ad06 | 248 | if (asprintf(&m->cgroup_hierarchy, "%s%s", streq(current, "/") ? "" : current, suffix) < 0) { |
c6c18be3 LP |
249 | r = -ENOMEM; |
250 | goto finish; | |
251 | } | |
8e274523 LP |
252 | } |
253 | ||
35d2e7ec | 254 | /* 2. Show data */ |
c6c18be3 LP |
255 | if ((r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_hierarchy, NULL, &path)) < 0) |
256 | goto finish; | |
8e274523 | 257 | |
c6c18be3 LP |
258 | log_debug("Using cgroup controller " SYSTEMD_CGROUP_CONTROLLER ". File system hierarchy is at %s.", path); |
259 | ||
35d2e7ec | 260 | /* 3. Install agent */ |
91901329 | 261 | if ((r = cg_install_release_agent(SYSTEMD_CGROUP_CONTROLLER, SYSTEMD_CGROUP_AGENT_PATH)) < 0) |
8e274523 | 262 | log_warning("Failed to install release agent, ignoring: %s", strerror(-r)); |
c6c18be3 LP |
263 | else if (r > 0) |
264 | log_debug("Installed release agent."); | |
8e274523 | 265 | else |
c6c18be3 | 266 | log_debug("Release agent already installed."); |
8e274523 | 267 | |
35d2e7ec | 268 | /* 4. Realize the group */ |
c6c18be3 | 269 | if ((r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_hierarchy, 0)) < 0) { |
8e274523 | 270 | log_error("Failed to create root cgroup hierarchy: %s", strerror(-r)); |
c6c18be3 LP |
271 | goto finish; |
272 | } | |
273 | ||
35d2e7ec | 274 | /* 5. And pin it, so that it cannot be unmounted */ |
c6c18be3 LP |
275 | if (m->pin_cgroupfs_fd >= 0) |
276 | close_nointr_nofail(m->pin_cgroupfs_fd); | |
277 | ||
278 | if ((m->pin_cgroupfs_fd = open(path, O_RDONLY|O_CLOEXEC|O_DIRECTORY|O_NOCTTY|O_NONBLOCK)) < 0) { | |
279 | r = -errno; | |
280 | goto finish; | |
281 | } | |
282 | ||
283 | log_debug("Created root group."); | |
284 | ||
285 | finish: | |
286 | free(current); | |
287 | free(path); | |
8e274523 LP |
288 | |
289 | return r; | |
290 | } | |
291 | ||
c6c18be3 | 292 | void manager_shutdown_cgroup(Manager *m, bool delete) { |
8e274523 LP |
293 | assert(m); |
294 | ||
c6c18be3 LP |
295 | if (delete && m->cgroup_hierarchy) |
296 | cg_delete(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_hierarchy); | |
8e274523 | 297 | |
c6c18be3 LP |
298 | if (m->pin_cgroupfs_fd >= 0) { |
299 | close_nointr_nofail(m->pin_cgroupfs_fd); | |
300 | m->pin_cgroupfs_fd = -1; | |
301 | } | |
302 | ||
303 | free(m->cgroup_hierarchy); | |
304 | m->cgroup_hierarchy = NULL; | |
8e274523 LP |
305 | } |
306 | ||
307 | int cgroup_notify_empty(Manager *m, const char *group) { | |
308 | CGroupBonding *l, *b; | |
309 | ||
310 | assert(m); | |
311 | assert(group); | |
312 | ||
313 | if (!(l = hashmap_get(m->cgroup_bondings, group))) | |
314 | return 0; | |
315 | ||
316 | LIST_FOREACH(by_path, b, l) { | |
317 | int t; | |
318 | ||
319 | if (!b->unit) | |
320 | continue; | |
321 | ||
322 | if ((t = cgroup_bonding_is_empty_list(b)) < 0) { | |
323 | ||
324 | /* If we don't know, we don't know */ | |
325 | if (t != -EAGAIN) | |
326 | log_warning("Failed to check whether cgroup is empty: %s", strerror(errno)); | |
327 | ||
328 | continue; | |
329 | } | |
330 | ||
331 | if (t > 0) | |
332 | if (UNIT_VTABLE(b->unit)->cgroup_notify_empty) | |
333 | UNIT_VTABLE(b->unit)->cgroup_notify_empty(b->unit); | |
334 | } | |
335 | ||
336 | return 0; | |
337 | } | |
338 | ||
8c47c732 LP |
339 | Unit* cgroup_unit_by_pid(Manager *m, pid_t pid) { |
340 | CGroupBonding *l, *b; | |
341 | char *group = NULL; | |
8c47c732 LP |
342 | |
343 | assert(m); | |
344 | ||
345 | if (pid <= 1) | |
346 | return NULL; | |
347 | ||
e364ad06 | 348 | if (cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, pid, &group) < 0) |
8c47c732 LP |
349 | return NULL; |
350 | ||
351 | l = hashmap_get(m->cgroup_bondings, group); | |
4455bcd0 LP |
352 | |
353 | if (!l) { | |
354 | char *slash; | |
355 | ||
356 | while ((slash = strrchr(group, '/'))) { | |
357 | if (slash == group) | |
358 | break; | |
359 | ||
360 | *slash = 0; | |
361 | ||
362 | if ((l = hashmap_get(m->cgroup_bondings, group))) | |
363 | break; | |
364 | } | |
365 | } | |
366 | ||
8c47c732 LP |
367 | free(group); |
368 | ||
8c47c732 LP |
369 | LIST_FOREACH(by_path, b, l) { |
370 | ||
371 | if (!b->unit) | |
372 | continue; | |
373 | ||
d686d8a9 | 374 | if (b->ours) |
8c47c732 LP |
375 | return b->unit; |
376 | } | |
377 | ||
378 | return NULL; | |
379 | } | |
380 | ||
8e274523 LP |
381 | CGroupBonding *cgroup_bonding_find_list(CGroupBonding *first, const char *controller) { |
382 | CGroupBonding *b; | |
383 | ||
384 | assert(controller); | |
385 | ||
386 | LIST_FOREACH(by_unit, b, first) | |
387 | if (streq(b->controller, controller)) | |
388 | return b; | |
389 | ||
390 | return NULL; | |
391 | } | |
6dde1f33 LP |
392 | |
393 | char *cgroup_bonding_to_string(CGroupBonding *b) { | |
394 | char *r; | |
395 | ||
396 | assert(b); | |
397 | ||
398 | if (asprintf(&r, "%s:%s", b->controller, b->path) < 0) | |
399 | return NULL; | |
400 | ||
401 | return r; | |
402 | } | |
4fbf50b3 LP |
403 | |
404 | pid_t cgroup_bonding_search_main_pid(CGroupBonding *b) { | |
405 | FILE *f; | |
406 | pid_t pid = 0, npid; | |
407 | int r; | |
408 | ||
409 | assert(b); | |
410 | ||
d686d8a9 | 411 | if (!b->ours) |
4fbf50b3 LP |
412 | return 0; |
413 | ||
414 | if ((r = cg_enumerate_processes(b->controller, b->path, &f)) < 0) | |
415 | return 0; | |
416 | ||
417 | while ((r = cg_read_pid(f, &npid)) > 0) { | |
418 | ||
419 | if (npid == pid) | |
420 | continue; | |
421 | ||
422 | if (pid != 0) { | |
423 | /* Dang, there's more than one PID in this | |
424 | * group, so we don't know what process is the | |
425 | * main process. */ | |
426 | pid = 0; | |
427 | break; | |
428 | } | |
429 | ||
430 | pid = npid; | |
431 | } | |
432 | ||
433 | fclose(f); | |
434 | ||
435 | return pid; | |
436 | } | |
437 | ||
438 | pid_t cgroup_bonding_search_main_pid_list(CGroupBonding *first) { | |
439 | CGroupBonding *b; | |
440 | pid_t pid; | |
441 | ||
442 | /* Try to find a main pid from this cgroup, but checking if | |
443 | * there's only one PID in the cgroup and returning it. Later | |
444 | * on we might want to add additional, smarter heuristics | |
445 | * here. */ | |
446 | ||
447 | LIST_FOREACH(by_unit, b, first) | |
448 | if ((pid = cgroup_bonding_search_main_pid(b)) != 0) | |
449 | return pid; | |
450 | ||
451 | return 0; | |
452 | ||
453 | } |