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8e274523 LP |
1 | /*-*- Mode: C; c-basic-offset: 8 -*-*/ |
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 | ||
141 | int cgroup_bonding_kill(CGroupBonding *b, int sig) { | |
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 | ||
35d2e7ec | 152 | return cg_kill_recursive(b->controller, b->path, sig, true, false); |
8e274523 LP |
153 | } |
154 | ||
155 | int cgroup_bonding_kill_list(CGroupBonding *first, int sig) { | |
156 | CGroupBonding *b; | |
50159e6a | 157 | int r = -EAGAIN; |
8e274523 LP |
158 | |
159 | LIST_FOREACH(by_unit, b, first) { | |
50159e6a | 160 | if ((r = cgroup_bonding_kill(b, sig)) < 0) { |
8c6db833 | 161 | if (r == -EAGAIN || r == -ESRCH) |
50159e6a | 162 | continue; |
8e274523 | 163 | |
8e274523 | 164 | return r; |
50159e6a LP |
165 | } |
166 | ||
167 | return 0; | |
8e274523 LP |
168 | } |
169 | ||
50159e6a | 170 | return r; |
8e274523 LP |
171 | } |
172 | ||
173 | /* Returns 1 if the group is empty, 0 if it is not, -EAGAIN if we | |
174 | * cannot know */ | |
175 | int cgroup_bonding_is_empty(CGroupBonding *b) { | |
8e274523 LP |
176 | int r; |
177 | ||
178 | assert(b); | |
179 | ||
8c6db833 LP |
180 | if ((r = cg_is_empty_recursive(b->controller, b->path, true)) < 0) |
181 | return r; | |
8e274523 | 182 | |
8c6db833 LP |
183 | /* If it is empty it is empty */ |
184 | if (r > 0) | |
8e274523 LP |
185 | return 1; |
186 | ||
8c6db833 LP |
187 | /* It's not only us using this cgroup, so we just don't know */ |
188 | return b->only_us ? 0 : -EAGAIN; | |
8e274523 LP |
189 | } |
190 | ||
191 | int cgroup_bonding_is_empty_list(CGroupBonding *first) { | |
192 | CGroupBonding *b; | |
193 | ||
194 | LIST_FOREACH(by_unit, b, first) { | |
195 | int r; | |
196 | ||
197 | if ((r = cgroup_bonding_is_empty(b)) < 0) { | |
198 | /* If this returned -EAGAIN, then we don't know if the | |
199 | * group is empty, so let's see if another group can | |
200 | * tell us */ | |
201 | ||
202 | if (r != -EAGAIN) | |
203 | return r; | |
204 | } else | |
205 | return r; | |
206 | } | |
207 | ||
208 | return -EAGAIN; | |
209 | } | |
210 | ||
8e274523 | 211 | int manager_setup_cgroup(Manager *m) { |
c6c18be3 | 212 | char *current = NULL, *path = NULL; |
8e274523 | 213 | int r; |
7ccfb64a | 214 | char suffix[32]; |
8e274523 LP |
215 | |
216 | assert(m); | |
217 | ||
35d2e7ec | 218 | /* 1. Determine hierarchy */ |
c6c18be3 LP |
219 | if ((r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 0, ¤t)) < 0) |
220 | goto finish; | |
8e274523 | 221 | |
c6c18be3 | 222 | snprintf(suffix, sizeof(suffix), "/systemd-%lu", (unsigned long) getpid()); |
7ccfb64a LP |
223 | char_array_0(suffix); |
224 | ||
8e274523 | 225 | free(m->cgroup_hierarchy); |
c6c18be3 | 226 | if (endswith(current, suffix)) { |
7ccfb64a | 227 | /* We probably got reexecuted and can continue to use our root cgroup */ |
c6c18be3 LP |
228 | m->cgroup_hierarchy = current; |
229 | current = NULL; | |
7ccfb64a | 230 | |
c6c18be3 LP |
231 | } else { |
232 | /* We need a new root cgroup */ | |
7ccfb64a | 233 | m->cgroup_hierarchy = NULL; |
e364ad06 | 234 | if (asprintf(&m->cgroup_hierarchy, "%s%s", streq(current, "/") ? "" : current, suffix) < 0) { |
c6c18be3 LP |
235 | r = -ENOMEM; |
236 | goto finish; | |
237 | } | |
8e274523 LP |
238 | } |
239 | ||
35d2e7ec | 240 | /* 2. Show data */ |
c6c18be3 LP |
241 | if ((r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_hierarchy, NULL, &path)) < 0) |
242 | goto finish; | |
8e274523 | 243 | |
c6c18be3 LP |
244 | log_debug("Using cgroup controller " SYSTEMD_CGROUP_CONTROLLER ". File system hierarchy is at %s.", path); |
245 | ||
35d2e7ec | 246 | /* 3. Install agent */ |
55096547 | 247 | if ((r = cg_install_release_agent(SYSTEMD_CGROUP_CONTROLLER, CGROUP_AGENT_PATH)) < 0) |
8e274523 | 248 | log_warning("Failed to install release agent, ignoring: %s", strerror(-r)); |
c6c18be3 LP |
249 | else if (r > 0) |
250 | log_debug("Installed release agent."); | |
8e274523 | 251 | else |
c6c18be3 | 252 | log_debug("Release agent already installed."); |
8e274523 | 253 | |
35d2e7ec | 254 | /* 4. Realize the group */ |
c6c18be3 | 255 | if ((r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_hierarchy, 0)) < 0) { |
8e274523 | 256 | log_error("Failed to create root cgroup hierarchy: %s", strerror(-r)); |
c6c18be3 LP |
257 | goto finish; |
258 | } | |
259 | ||
35d2e7ec | 260 | /* 5. And pin it, so that it cannot be unmounted */ |
c6c18be3 LP |
261 | if (m->pin_cgroupfs_fd >= 0) |
262 | close_nointr_nofail(m->pin_cgroupfs_fd); | |
263 | ||
264 | if ((m->pin_cgroupfs_fd = open(path, O_RDONLY|O_CLOEXEC|O_DIRECTORY|O_NOCTTY|O_NONBLOCK)) < 0) { | |
265 | r = -errno; | |
266 | goto finish; | |
267 | } | |
268 | ||
269 | log_debug("Created root group."); | |
270 | ||
271 | finish: | |
272 | free(current); | |
273 | free(path); | |
8e274523 LP |
274 | |
275 | return r; | |
276 | } | |
277 | ||
c6c18be3 | 278 | void manager_shutdown_cgroup(Manager *m, bool delete) { |
8e274523 LP |
279 | assert(m); |
280 | ||
c6c18be3 LP |
281 | if (delete && m->cgroup_hierarchy) |
282 | cg_delete(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_hierarchy); | |
8e274523 | 283 | |
c6c18be3 LP |
284 | if (m->pin_cgroupfs_fd >= 0) { |
285 | close_nointr_nofail(m->pin_cgroupfs_fd); | |
286 | m->pin_cgroupfs_fd = -1; | |
287 | } | |
288 | ||
289 | free(m->cgroup_hierarchy); | |
290 | m->cgroup_hierarchy = NULL; | |
8e274523 LP |
291 | } |
292 | ||
293 | int cgroup_notify_empty(Manager *m, const char *group) { | |
294 | CGroupBonding *l, *b; | |
295 | ||
296 | assert(m); | |
297 | assert(group); | |
298 | ||
299 | if (!(l = hashmap_get(m->cgroup_bondings, group))) | |
300 | return 0; | |
301 | ||
302 | LIST_FOREACH(by_path, b, l) { | |
303 | int t; | |
304 | ||
305 | if (!b->unit) | |
306 | continue; | |
307 | ||
308 | if ((t = cgroup_bonding_is_empty_list(b)) < 0) { | |
309 | ||
310 | /* If we don't know, we don't know */ | |
311 | if (t != -EAGAIN) | |
312 | log_warning("Failed to check whether cgroup is empty: %s", strerror(errno)); | |
313 | ||
314 | continue; | |
315 | } | |
316 | ||
317 | if (t > 0) | |
318 | if (UNIT_VTABLE(b->unit)->cgroup_notify_empty) | |
319 | UNIT_VTABLE(b->unit)->cgroup_notify_empty(b->unit); | |
320 | } | |
321 | ||
322 | return 0; | |
323 | } | |
324 | ||
8c47c732 LP |
325 | Unit* cgroup_unit_by_pid(Manager *m, pid_t pid) { |
326 | CGroupBonding *l, *b; | |
327 | char *group = NULL; | |
8c47c732 LP |
328 | |
329 | assert(m); | |
330 | ||
331 | if (pid <= 1) | |
332 | return NULL; | |
333 | ||
e364ad06 | 334 | if (cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, pid, &group) < 0) |
8c47c732 LP |
335 | return NULL; |
336 | ||
337 | l = hashmap_get(m->cgroup_bondings, group); | |
4455bcd0 LP |
338 | |
339 | if (!l) { | |
340 | char *slash; | |
341 | ||
342 | while ((slash = strrchr(group, '/'))) { | |
343 | if (slash == group) | |
344 | break; | |
345 | ||
346 | *slash = 0; | |
347 | ||
348 | if ((l = hashmap_get(m->cgroup_bondings, group))) | |
349 | break; | |
350 | } | |
351 | } | |
352 | ||
8c47c732 LP |
353 | free(group); |
354 | ||
8c47c732 LP |
355 | LIST_FOREACH(by_path, b, l) { |
356 | ||
357 | if (!b->unit) | |
358 | continue; | |
359 | ||
360 | if (b->only_us) | |
361 | return b->unit; | |
362 | } | |
363 | ||
364 | return NULL; | |
365 | } | |
366 | ||
8e274523 LP |
367 | CGroupBonding *cgroup_bonding_find_list(CGroupBonding *first, const char *controller) { |
368 | CGroupBonding *b; | |
369 | ||
370 | assert(controller); | |
371 | ||
372 | LIST_FOREACH(by_unit, b, first) | |
373 | if (streq(b->controller, controller)) | |
374 | return b; | |
375 | ||
376 | return NULL; | |
377 | } | |
6dde1f33 LP |
378 | |
379 | char *cgroup_bonding_to_string(CGroupBonding *b) { | |
380 | char *r; | |
381 | ||
382 | assert(b); | |
383 | ||
384 | if (asprintf(&r, "%s:%s", b->controller, b->path) < 0) | |
385 | return NULL; | |
386 | ||
387 | return r; | |
388 | } |