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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 | |
8c6db833 LP |
49 | if (b->only_us && b->clean_up) |
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) |
8e274523 LP |
60 | if ((r = cgroup_bonding_realize(b)) < 0) |
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 | ||
74 | assert_se(f = hashmap_get(b->unit->meta.manager->cgroup_bondings, b->path)); | |
75 | LIST_REMOVE(CGroupBonding, by_path, f, b); | |
76 | ||
77 | if (f) | |
78 | hashmap_replace(b->unit->meta.manager->cgroup_bondings, b->path, f); | |
79 | else | |
80 | hashmap_remove(b->unit->meta.manager->cgroup_bondings, b->path); | |
81 | } | |
82 | ||
8c6db833 | 83 | if (b->realized && b->only_us && b->clean_up) { |
8e274523 | 84 | |
8c6db833 LP |
85 | if (cgroup_bonding_is_empty(b) > 0) |
86 | cg_delete(b->controller, b->path); | |
87 | else | |
88 | cg_trim(b->controller, b->path, false); | |
8e274523 LP |
89 | } |
90 | ||
c9106f61 LP |
91 | free(b->controller); |
92 | free(b->path); | |
8e274523 LP |
93 | free(b); |
94 | } | |
95 | ||
96 | void cgroup_bonding_free_list(CGroupBonding *first) { | |
97 | CGroupBonding *b, *n; | |
98 | ||
99 | LIST_FOREACH_SAFE(by_unit, b, n, first) | |
100 | cgroup_bonding_free(b); | |
101 | } | |
102 | ||
fb385181 LP |
103 | void cgroup_bonding_trim(CGroupBonding *b, bool delete_root) { |
104 | assert(b); | |
105 | ||
106 | if (b->realized && b->only_us && b->clean_up) | |
107 | cg_trim(b->controller, b->path, delete_root); | |
108 | } | |
109 | ||
110 | void cgroup_bonding_trim_list(CGroupBonding *first, bool delete_root) { | |
111 | CGroupBonding *b; | |
112 | ||
113 | LIST_FOREACH(by_unit, b, first) | |
114 | cgroup_bonding_trim(b, delete_root); | |
115 | } | |
116 | ||
8e274523 LP |
117 | int cgroup_bonding_install(CGroupBonding *b, pid_t pid) { |
118 | int r; | |
119 | ||
120 | assert(b); | |
121 | assert(pid >= 0); | |
122 | ||
8c6db833 LP |
123 | if ((r = cg_create_and_attach(b->controller, b->path, pid)) < 0) |
124 | return r; | |
8e274523 | 125 | |
8c6db833 | 126 | b->realized = true; |
8e274523 LP |
127 | return 0; |
128 | } | |
129 | ||
130 | int cgroup_bonding_install_list(CGroupBonding *first, pid_t pid) { | |
131 | CGroupBonding *b; | |
8c6db833 | 132 | int r; |
8e274523 | 133 | |
8c6db833 | 134 | LIST_FOREACH(by_unit, b, first) |
8e274523 LP |
135 | if ((r = cgroup_bonding_install(b, pid)) < 0) |
136 | return r; | |
8e274523 LP |
137 | |
138 | return 0; | |
139 | } | |
140 | ||
ca949c9d | 141 | int cgroup_bonding_kill(CGroupBonding *b, int sig, Set *s) { |
8e274523 | 142 | int r; |
8e274523 LP |
143 | |
144 | assert(b); | |
8c6db833 | 145 | assert(sig >= 0); |
8e274523 | 146 | |
8c6db833 | 147 | if ((r = cgroup_bonding_realize(b)) < 0) |
50159e6a LP |
148 | return r; |
149 | ||
8c6db833 LP |
150 | assert(b->realized); |
151 | ||
ca949c9d | 152 | return cg_kill_recursive(b->controller, b->path, sig, true, false, s); |
8e274523 LP |
153 | } |
154 | ||
ca949c9d | 155 | int cgroup_bonding_kill_list(CGroupBonding *first, int sig, Set *s) { |
8e274523 | 156 | CGroupBonding *b; |
ca949c9d LP |
157 | Set *allocated_set = NULL; |
158 | int ret = -EAGAIN, r; | |
159 | ||
160 | if (!s) | |
161 | if (!(s = allocated_set = set_new(trivial_hash_func, trivial_compare_func))) | |
162 | return -ENOMEM; | |
8e274523 LP |
163 | |
164 | LIST_FOREACH(by_unit, b, first) { | |
ca949c9d | 165 | if ((r = cgroup_bonding_kill(b, sig, s)) < 0) { |
8c6db833 | 166 | if (r == -EAGAIN || r == -ESRCH) |
50159e6a | 167 | continue; |
8e274523 | 168 | |
ca949c9d LP |
169 | ret = r; |
170 | goto finish; | |
50159e6a LP |
171 | } |
172 | ||
ca949c9d LP |
173 | if (ret < 0 || r > 0) |
174 | ret = r; | |
8e274523 LP |
175 | } |
176 | ||
ca949c9d LP |
177 | finish: |
178 | if (allocated_set) | |
179 | set_free(allocated_set); | |
180 | ||
181 | return ret; | |
8e274523 LP |
182 | } |
183 | ||
184 | /* Returns 1 if the group is empty, 0 if it is not, -EAGAIN if we | |
185 | * cannot know */ | |
186 | int cgroup_bonding_is_empty(CGroupBonding *b) { | |
8e274523 LP |
187 | int r; |
188 | ||
189 | assert(b); | |
190 | ||
8c6db833 LP |
191 | if ((r = cg_is_empty_recursive(b->controller, b->path, true)) < 0) |
192 | return r; | |
8e274523 | 193 | |
8c6db833 LP |
194 | /* If it is empty it is empty */ |
195 | if (r > 0) | |
8e274523 LP |
196 | return 1; |
197 | ||
8c6db833 LP |
198 | /* It's not only us using this cgroup, so we just don't know */ |
199 | return b->only_us ? 0 : -EAGAIN; | |
8e274523 LP |
200 | } |
201 | ||
202 | int cgroup_bonding_is_empty_list(CGroupBonding *first) { | |
203 | CGroupBonding *b; | |
204 | ||
205 | LIST_FOREACH(by_unit, b, first) { | |
206 | int r; | |
207 | ||
208 | if ((r = cgroup_bonding_is_empty(b)) < 0) { | |
209 | /* If this returned -EAGAIN, then we don't know if the | |
210 | * group is empty, so let's see if another group can | |
211 | * tell us */ | |
212 | ||
213 | if (r != -EAGAIN) | |
214 | return r; | |
215 | } else | |
216 | return r; | |
217 | } | |
218 | ||
219 | return -EAGAIN; | |
220 | } | |
221 | ||
8e274523 | 222 | int manager_setup_cgroup(Manager *m) { |
c6c18be3 | 223 | char *current = NULL, *path = NULL; |
8e274523 | 224 | int r; |
7ccfb64a | 225 | char suffix[32]; |
8e274523 LP |
226 | |
227 | assert(m); | |
228 | ||
35d2e7ec | 229 | /* 1. Determine hierarchy */ |
c6c18be3 LP |
230 | if ((r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 0, ¤t)) < 0) |
231 | goto finish; | |
8e274523 | 232 | |
0baf24dd LP |
233 | if (m->running_as == MANAGER_SYSTEM) |
234 | strcpy(suffix, "/system"); | |
235 | else { | |
236 | snprintf(suffix, sizeof(suffix), "/systemd-%lu", (unsigned long) getpid()); | |
237 | char_array_0(suffix); | |
238 | } | |
7ccfb64a | 239 | |
8e274523 | 240 | free(m->cgroup_hierarchy); |
c6c18be3 | 241 | if (endswith(current, suffix)) { |
7ccfb64a | 242 | /* We probably got reexecuted and can continue to use our root cgroup */ |
c6c18be3 LP |
243 | m->cgroup_hierarchy = current; |
244 | current = NULL; | |
7ccfb64a | 245 | |
c6c18be3 LP |
246 | } else { |
247 | /* We need a new root cgroup */ | |
7ccfb64a | 248 | m->cgroup_hierarchy = NULL; |
e364ad06 | 249 | if (asprintf(&m->cgroup_hierarchy, "%s%s", streq(current, "/") ? "" : current, suffix) < 0) { |
c6c18be3 LP |
250 | r = -ENOMEM; |
251 | goto finish; | |
252 | } | |
8e274523 LP |
253 | } |
254 | ||
35d2e7ec | 255 | /* 2. Show data */ |
c6c18be3 LP |
256 | if ((r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_hierarchy, NULL, &path)) < 0) |
257 | goto finish; | |
8e274523 | 258 | |
c6c18be3 LP |
259 | log_debug("Using cgroup controller " SYSTEMD_CGROUP_CONTROLLER ". File system hierarchy is at %s.", path); |
260 | ||
35d2e7ec | 261 | /* 3. Install agent */ |
91901329 | 262 | if ((r = cg_install_release_agent(SYSTEMD_CGROUP_CONTROLLER, SYSTEMD_CGROUP_AGENT_PATH)) < 0) |
8e274523 | 263 | log_warning("Failed to install release agent, ignoring: %s", strerror(-r)); |
c6c18be3 LP |
264 | else if (r > 0) |
265 | log_debug("Installed release agent."); | |
8e274523 | 266 | else |
c6c18be3 | 267 | log_debug("Release agent already installed."); |
8e274523 | 268 | |
35d2e7ec | 269 | /* 4. Realize the group */ |
c6c18be3 | 270 | if ((r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_hierarchy, 0)) < 0) { |
8e274523 | 271 | log_error("Failed to create root cgroup hierarchy: %s", strerror(-r)); |
c6c18be3 LP |
272 | goto finish; |
273 | } | |
274 | ||
35d2e7ec | 275 | /* 5. And pin it, so that it cannot be unmounted */ |
c6c18be3 LP |
276 | if (m->pin_cgroupfs_fd >= 0) |
277 | close_nointr_nofail(m->pin_cgroupfs_fd); | |
278 | ||
279 | if ((m->pin_cgroupfs_fd = open(path, O_RDONLY|O_CLOEXEC|O_DIRECTORY|O_NOCTTY|O_NONBLOCK)) < 0) { | |
280 | r = -errno; | |
281 | goto finish; | |
282 | } | |
283 | ||
284 | log_debug("Created root group."); | |
285 | ||
286 | finish: | |
287 | free(current); | |
288 | free(path); | |
8e274523 LP |
289 | |
290 | return r; | |
291 | } | |
292 | ||
c6c18be3 | 293 | void manager_shutdown_cgroup(Manager *m, bool delete) { |
8e274523 LP |
294 | assert(m); |
295 | ||
c6c18be3 LP |
296 | if (delete && m->cgroup_hierarchy) |
297 | cg_delete(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_hierarchy); | |
8e274523 | 298 | |
c6c18be3 LP |
299 | if (m->pin_cgroupfs_fd >= 0) { |
300 | close_nointr_nofail(m->pin_cgroupfs_fd); | |
301 | m->pin_cgroupfs_fd = -1; | |
302 | } | |
303 | ||
304 | free(m->cgroup_hierarchy); | |
305 | m->cgroup_hierarchy = NULL; | |
8e274523 LP |
306 | } |
307 | ||
308 | int cgroup_notify_empty(Manager *m, const char *group) { | |
309 | CGroupBonding *l, *b; | |
310 | ||
311 | assert(m); | |
312 | assert(group); | |
313 | ||
314 | if (!(l = hashmap_get(m->cgroup_bondings, group))) | |
315 | return 0; | |
316 | ||
317 | LIST_FOREACH(by_path, b, l) { | |
318 | int t; | |
319 | ||
320 | if (!b->unit) | |
321 | continue; | |
322 | ||
323 | if ((t = cgroup_bonding_is_empty_list(b)) < 0) { | |
324 | ||
325 | /* If we don't know, we don't know */ | |
326 | if (t != -EAGAIN) | |
327 | log_warning("Failed to check whether cgroup is empty: %s", strerror(errno)); | |
328 | ||
329 | continue; | |
330 | } | |
331 | ||
332 | if (t > 0) | |
333 | if (UNIT_VTABLE(b->unit)->cgroup_notify_empty) | |
334 | UNIT_VTABLE(b->unit)->cgroup_notify_empty(b->unit); | |
335 | } | |
336 | ||
337 | return 0; | |
338 | } | |
339 | ||
8c47c732 LP |
340 | Unit* cgroup_unit_by_pid(Manager *m, pid_t pid) { |
341 | CGroupBonding *l, *b; | |
342 | char *group = NULL; | |
8c47c732 LP |
343 | |
344 | assert(m); | |
345 | ||
346 | if (pid <= 1) | |
347 | return NULL; | |
348 | ||
e364ad06 | 349 | if (cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, pid, &group) < 0) |
8c47c732 LP |
350 | return NULL; |
351 | ||
352 | l = hashmap_get(m->cgroup_bondings, group); | |
4455bcd0 LP |
353 | |
354 | if (!l) { | |
355 | char *slash; | |
356 | ||
357 | while ((slash = strrchr(group, '/'))) { | |
358 | if (slash == group) | |
359 | break; | |
360 | ||
361 | *slash = 0; | |
362 | ||
363 | if ((l = hashmap_get(m->cgroup_bondings, group))) | |
364 | break; | |
365 | } | |
366 | } | |
367 | ||
8c47c732 LP |
368 | free(group); |
369 | ||
8c47c732 LP |
370 | LIST_FOREACH(by_path, b, l) { |
371 | ||
372 | if (!b->unit) | |
373 | continue; | |
374 | ||
375 | if (b->only_us) | |
376 | return b->unit; | |
377 | } | |
378 | ||
379 | return NULL; | |
380 | } | |
381 | ||
8e274523 LP |
382 | CGroupBonding *cgroup_bonding_find_list(CGroupBonding *first, const char *controller) { |
383 | CGroupBonding *b; | |
384 | ||
385 | assert(controller); | |
386 | ||
387 | LIST_FOREACH(by_unit, b, first) | |
388 | if (streq(b->controller, controller)) | |
389 | return b; | |
390 | ||
391 | return NULL; | |
392 | } | |
6dde1f33 LP |
393 | |
394 | char *cgroup_bonding_to_string(CGroupBonding *b) { | |
395 | char *r; | |
396 | ||
397 | assert(b); | |
398 | ||
399 | if (asprintf(&r, "%s:%s", b->controller, b->path) < 0) | |
400 | return NULL; | |
401 | ||
402 | return r; | |
403 | } | |
4fbf50b3 LP |
404 | |
405 | pid_t cgroup_bonding_search_main_pid(CGroupBonding *b) { | |
406 | FILE *f; | |
407 | pid_t pid = 0, npid; | |
408 | int r; | |
409 | ||
410 | assert(b); | |
411 | ||
412 | if (!b->only_us) | |
413 | return 0; | |
414 | ||
415 | if ((r = cg_enumerate_processes(b->controller, b->path, &f)) < 0) | |
416 | return 0; | |
417 | ||
418 | while ((r = cg_read_pid(f, &npid)) > 0) { | |
419 | ||
420 | if (npid == pid) | |
421 | continue; | |
422 | ||
423 | if (pid != 0) { | |
424 | /* Dang, there's more than one PID in this | |
425 | * group, so we don't know what process is the | |
426 | * main process. */ | |
427 | pid = 0; | |
428 | break; | |
429 | } | |
430 | ||
431 | pid = npid; | |
432 | } | |
433 | ||
434 | fclose(f); | |
435 | ||
436 | return pid; | |
437 | } | |
438 | ||
439 | pid_t cgroup_bonding_search_main_pid_list(CGroupBonding *first) { | |
440 | CGroupBonding *b; | |
441 | pid_t pid; | |
442 | ||
443 | /* Try to find a main pid from this cgroup, but checking if | |
444 | * there's only one PID in the cgroup and returning it. Later | |
445 | * on we might want to add additional, smarter heuristics | |
446 | * here. */ | |
447 | ||
448 | LIST_FOREACH(by_unit, b, first) | |
449 | if ((pid = cgroup_bonding_search_main_pid(b)) != 0) | |
450 | return pid; | |
451 | ||
452 | return 0; | |
453 | ||
454 | } |