]>
Commit | Line | Data |
---|---|---|
1 | /* SPDX-License-Identifier: LGPL-2.1+ */ | |
2 | /*** | |
3 | Copyright 2010 Lennart Poettering | |
4 | ***/ | |
5 | ||
6 | #include <dirent.h> | |
7 | #include <errno.h> | |
8 | #include <ftw.h> | |
9 | #include <limits.h> | |
10 | #include <signal.h> | |
11 | #include <stddef.h> | |
12 | #include <stdio_ext.h> | |
13 | #include <stdlib.h> | |
14 | #include <string.h> | |
15 | #include <sys/stat.h> | |
16 | #include <sys/statfs.h> | |
17 | #include <sys/types.h> | |
18 | #include <sys/xattr.h> | |
19 | #include <unistd.h> | |
20 | ||
21 | #include "alloc-util.h" | |
22 | #include "cgroup-util.h" | |
23 | #include "def.h" | |
24 | #include "dirent-util.h" | |
25 | #include "extract-word.h" | |
26 | #include "fd-util.h" | |
27 | #include "fileio.h" | |
28 | #include "format-util.h" | |
29 | #include "fs-util.h" | |
30 | #include "log.h" | |
31 | #include "login-util.h" | |
32 | #include "macro.h" | |
33 | #include "missing.h" | |
34 | #include "mkdir.h" | |
35 | #include "parse-util.h" | |
36 | #include "path-util.h" | |
37 | #include "proc-cmdline.h" | |
38 | #include "process-util.h" | |
39 | #include "set.h" | |
40 | #include "special.h" | |
41 | #include "stat-util.h" | |
42 | #include "stdio-util.h" | |
43 | #include "string-table.h" | |
44 | #include "string-util.h" | |
45 | #include "strv.h" | |
46 | #include "unit-name.h" | |
47 | #include "user-util.h" | |
48 | ||
49 | int cg_enumerate_processes(const char *controller, const char *path, FILE **_f) { | |
50 | _cleanup_free_ char *fs = NULL; | |
51 | FILE *f; | |
52 | int r; | |
53 | ||
54 | assert(_f); | |
55 | ||
56 | r = cg_get_path(controller, path, "cgroup.procs", &fs); | |
57 | if (r < 0) | |
58 | return r; | |
59 | ||
60 | f = fopen(fs, "re"); | |
61 | if (!f) | |
62 | return -errno; | |
63 | ||
64 | *_f = f; | |
65 | return 0; | |
66 | } | |
67 | ||
68 | int cg_read_pid(FILE *f, pid_t *_pid) { | |
69 | unsigned long ul; | |
70 | ||
71 | /* Note that the cgroup.procs might contain duplicates! See | |
72 | * cgroups.txt for details. */ | |
73 | ||
74 | assert(f); | |
75 | assert(_pid); | |
76 | ||
77 | errno = 0; | |
78 | if (fscanf(f, "%lu", &ul) != 1) { | |
79 | ||
80 | if (feof(f)) | |
81 | return 0; | |
82 | ||
83 | return errno > 0 ? -errno : -EIO; | |
84 | } | |
85 | ||
86 | if (ul <= 0) | |
87 | return -EIO; | |
88 | ||
89 | *_pid = (pid_t) ul; | |
90 | return 1; | |
91 | } | |
92 | ||
93 | int cg_read_event( | |
94 | const char *controller, | |
95 | const char *path, | |
96 | const char *event, | |
97 | char **val) { | |
98 | ||
99 | _cleanup_free_ char *events = NULL, *content = NULL; | |
100 | char *p, *line; | |
101 | int r; | |
102 | ||
103 | r = cg_get_path(controller, path, "cgroup.events", &events); | |
104 | if (r < 0) | |
105 | return r; | |
106 | ||
107 | r = read_full_file(events, &content, NULL); | |
108 | if (r < 0) | |
109 | return r; | |
110 | ||
111 | p = content; | |
112 | while ((line = strsep(&p, "\n"))) { | |
113 | char *key; | |
114 | ||
115 | key = strsep(&line, " "); | |
116 | if (!key || !line) | |
117 | return -EINVAL; | |
118 | ||
119 | if (strcmp(key, event)) | |
120 | continue; | |
121 | ||
122 | *val = strdup(line); | |
123 | return 0; | |
124 | } | |
125 | ||
126 | return -ENOENT; | |
127 | } | |
128 | ||
129 | bool cg_ns_supported(void) { | |
130 | static thread_local int enabled = -1; | |
131 | ||
132 | if (enabled >= 0) | |
133 | return enabled; | |
134 | ||
135 | if (access("/proc/self/ns/cgroup", F_OK) == 0) | |
136 | enabled = 1; | |
137 | else | |
138 | enabled = 0; | |
139 | ||
140 | return enabled; | |
141 | } | |
142 | ||
143 | int cg_enumerate_subgroups(const char *controller, const char *path, DIR **_d) { | |
144 | _cleanup_free_ char *fs = NULL; | |
145 | int r; | |
146 | DIR *d; | |
147 | ||
148 | assert(_d); | |
149 | ||
150 | /* This is not recursive! */ | |
151 | ||
152 | r = cg_get_path(controller, path, NULL, &fs); | |
153 | if (r < 0) | |
154 | return r; | |
155 | ||
156 | d = opendir(fs); | |
157 | if (!d) | |
158 | return -errno; | |
159 | ||
160 | *_d = d; | |
161 | return 0; | |
162 | } | |
163 | ||
164 | int cg_read_subgroup(DIR *d, char **fn) { | |
165 | struct dirent *de; | |
166 | ||
167 | assert(d); | |
168 | assert(fn); | |
169 | ||
170 | FOREACH_DIRENT_ALL(de, d, return -errno) { | |
171 | char *b; | |
172 | ||
173 | if (de->d_type != DT_DIR) | |
174 | continue; | |
175 | ||
176 | if (dot_or_dot_dot(de->d_name)) | |
177 | continue; | |
178 | ||
179 | b = strdup(de->d_name); | |
180 | if (!b) | |
181 | return -ENOMEM; | |
182 | ||
183 | *fn = b; | |
184 | return 1; | |
185 | } | |
186 | ||
187 | return 0; | |
188 | } | |
189 | ||
190 | int cg_rmdir(const char *controller, const char *path) { | |
191 | _cleanup_free_ char *p = NULL; | |
192 | int r; | |
193 | ||
194 | r = cg_get_path(controller, path, NULL, &p); | |
195 | if (r < 0) | |
196 | return r; | |
197 | ||
198 | r = rmdir(p); | |
199 | if (r < 0 && errno != ENOENT) | |
200 | return -errno; | |
201 | ||
202 | r = cg_hybrid_unified(); | |
203 | if (r < 0) | |
204 | return r; | |
205 | if (r == 0) | |
206 | return 0; | |
207 | ||
208 | if (streq(controller, SYSTEMD_CGROUP_CONTROLLER)) { | |
209 | r = cg_rmdir(SYSTEMD_CGROUP_CONTROLLER_LEGACY, path); | |
210 | if (r < 0) | |
211 | log_warning_errno(r, "Failed to remove compat systemd cgroup %s: %m", path); | |
212 | } | |
213 | ||
214 | return 0; | |
215 | } | |
216 | ||
217 | int cg_kill( | |
218 | const char *controller, | |
219 | const char *path, | |
220 | int sig, | |
221 | CGroupFlags flags, | |
222 | Set *s, | |
223 | cg_kill_log_func_t log_kill, | |
224 | void *userdata) { | |
225 | ||
226 | _cleanup_set_free_ Set *allocated_set = NULL; | |
227 | bool done = false; | |
228 | int r, ret = 0; | |
229 | pid_t my_pid; | |
230 | ||
231 | assert(sig >= 0); | |
232 | ||
233 | /* Don't send SIGCONT twice. Also, SIGKILL always works even when process is suspended, hence don't send | |
234 | * SIGCONT on SIGKILL. */ | |
235 | if (IN_SET(sig, SIGCONT, SIGKILL)) | |
236 | flags &= ~CGROUP_SIGCONT; | |
237 | ||
238 | /* This goes through the tasks list and kills them all. This | |
239 | * is repeated until no further processes are added to the | |
240 | * tasks list, to properly handle forking processes */ | |
241 | ||
242 | if (!s) { | |
243 | s = allocated_set = set_new(NULL); | |
244 | if (!s) | |
245 | return -ENOMEM; | |
246 | } | |
247 | ||
248 | my_pid = getpid_cached(); | |
249 | ||
250 | do { | |
251 | _cleanup_fclose_ FILE *f = NULL; | |
252 | pid_t pid = 0; | |
253 | done = true; | |
254 | ||
255 | r = cg_enumerate_processes(controller, path, &f); | |
256 | if (r < 0) { | |
257 | if (ret >= 0 && r != -ENOENT) | |
258 | return r; | |
259 | ||
260 | return ret; | |
261 | } | |
262 | ||
263 | while ((r = cg_read_pid(f, &pid)) > 0) { | |
264 | ||
265 | if ((flags & CGROUP_IGNORE_SELF) && pid == my_pid) | |
266 | continue; | |
267 | ||
268 | if (set_get(s, PID_TO_PTR(pid)) == PID_TO_PTR(pid)) | |
269 | continue; | |
270 | ||
271 | if (log_kill) | |
272 | log_kill(pid, sig, userdata); | |
273 | ||
274 | /* If we haven't killed this process yet, kill | |
275 | * it */ | |
276 | if (kill(pid, sig) < 0) { | |
277 | if (ret >= 0 && errno != ESRCH) | |
278 | ret = -errno; | |
279 | } else { | |
280 | if (flags & CGROUP_SIGCONT) | |
281 | (void) kill(pid, SIGCONT); | |
282 | ||
283 | if (ret == 0) | |
284 | ret = 1; | |
285 | } | |
286 | ||
287 | done = false; | |
288 | ||
289 | r = set_put(s, PID_TO_PTR(pid)); | |
290 | if (r < 0) { | |
291 | if (ret >= 0) | |
292 | return r; | |
293 | ||
294 | return ret; | |
295 | } | |
296 | } | |
297 | ||
298 | if (r < 0) { | |
299 | if (ret >= 0) | |
300 | return r; | |
301 | ||
302 | return ret; | |
303 | } | |
304 | ||
305 | /* To avoid racing against processes which fork | |
306 | * quicker than we can kill them we repeat this until | |
307 | * no new pids need to be killed. */ | |
308 | ||
309 | } while (!done); | |
310 | ||
311 | return ret; | |
312 | } | |
313 | ||
314 | int cg_kill_recursive( | |
315 | const char *controller, | |
316 | const char *path, | |
317 | int sig, | |
318 | CGroupFlags flags, | |
319 | Set *s, | |
320 | cg_kill_log_func_t log_kill, | |
321 | void *userdata) { | |
322 | ||
323 | _cleanup_set_free_ Set *allocated_set = NULL; | |
324 | _cleanup_closedir_ DIR *d = NULL; | |
325 | int r, ret; | |
326 | char *fn; | |
327 | ||
328 | assert(path); | |
329 | assert(sig >= 0); | |
330 | ||
331 | if (!s) { | |
332 | s = allocated_set = set_new(NULL); | |
333 | if (!s) | |
334 | return -ENOMEM; | |
335 | } | |
336 | ||
337 | ret = cg_kill(controller, path, sig, flags, s, log_kill, userdata); | |
338 | ||
339 | r = cg_enumerate_subgroups(controller, path, &d); | |
340 | if (r < 0) { | |
341 | if (ret >= 0 && r != -ENOENT) | |
342 | return r; | |
343 | ||
344 | return ret; | |
345 | } | |
346 | ||
347 | while ((r = cg_read_subgroup(d, &fn)) > 0) { | |
348 | _cleanup_free_ char *p = NULL; | |
349 | ||
350 | p = strjoin(path, "/", fn); | |
351 | free(fn); | |
352 | if (!p) | |
353 | return -ENOMEM; | |
354 | ||
355 | r = cg_kill_recursive(controller, p, sig, flags, s, log_kill, userdata); | |
356 | if (r != 0 && ret >= 0) | |
357 | ret = r; | |
358 | } | |
359 | if (ret >= 0 && r < 0) | |
360 | ret = r; | |
361 | ||
362 | if (flags & CGROUP_REMOVE) { | |
363 | r = cg_rmdir(controller, path); | |
364 | if (r < 0 && ret >= 0 && !IN_SET(r, -ENOENT, -EBUSY)) | |
365 | return r; | |
366 | } | |
367 | ||
368 | return ret; | |
369 | } | |
370 | ||
371 | int cg_migrate( | |
372 | const char *cfrom, | |
373 | const char *pfrom, | |
374 | const char *cto, | |
375 | const char *pto, | |
376 | CGroupFlags flags) { | |
377 | ||
378 | bool done = false; | |
379 | _cleanup_set_free_ Set *s = NULL; | |
380 | int r, ret = 0; | |
381 | pid_t my_pid; | |
382 | ||
383 | assert(cfrom); | |
384 | assert(pfrom); | |
385 | assert(cto); | |
386 | assert(pto); | |
387 | ||
388 | s = set_new(NULL); | |
389 | if (!s) | |
390 | return -ENOMEM; | |
391 | ||
392 | my_pid = getpid_cached(); | |
393 | ||
394 | do { | |
395 | _cleanup_fclose_ FILE *f = NULL; | |
396 | pid_t pid = 0; | |
397 | done = true; | |
398 | ||
399 | r = cg_enumerate_processes(cfrom, pfrom, &f); | |
400 | if (r < 0) { | |
401 | if (ret >= 0 && r != -ENOENT) | |
402 | return r; | |
403 | ||
404 | return ret; | |
405 | } | |
406 | ||
407 | while ((r = cg_read_pid(f, &pid)) > 0) { | |
408 | ||
409 | /* This might do weird stuff if we aren't a | |
410 | * single-threaded program. However, we | |
411 | * luckily know we are not */ | |
412 | if ((flags & CGROUP_IGNORE_SELF) && pid == my_pid) | |
413 | continue; | |
414 | ||
415 | if (set_get(s, PID_TO_PTR(pid)) == PID_TO_PTR(pid)) | |
416 | continue; | |
417 | ||
418 | /* Ignore kernel threads. Since they can only | |
419 | * exist in the root cgroup, we only check for | |
420 | * them there. */ | |
421 | if (cfrom && | |
422 | empty_or_root(pfrom) && | |
423 | is_kernel_thread(pid) > 0) | |
424 | continue; | |
425 | ||
426 | r = cg_attach(cto, pto, pid); | |
427 | if (r < 0) { | |
428 | if (ret >= 0 && r != -ESRCH) | |
429 | ret = r; | |
430 | } else if (ret == 0) | |
431 | ret = 1; | |
432 | ||
433 | done = false; | |
434 | ||
435 | r = set_put(s, PID_TO_PTR(pid)); | |
436 | if (r < 0) { | |
437 | if (ret >= 0) | |
438 | return r; | |
439 | ||
440 | return ret; | |
441 | } | |
442 | } | |
443 | ||
444 | if (r < 0) { | |
445 | if (ret >= 0) | |
446 | return r; | |
447 | ||
448 | return ret; | |
449 | } | |
450 | } while (!done); | |
451 | ||
452 | return ret; | |
453 | } | |
454 | ||
455 | int cg_migrate_recursive( | |
456 | const char *cfrom, | |
457 | const char *pfrom, | |
458 | const char *cto, | |
459 | const char *pto, | |
460 | CGroupFlags flags) { | |
461 | ||
462 | _cleanup_closedir_ DIR *d = NULL; | |
463 | int r, ret = 0; | |
464 | char *fn; | |
465 | ||
466 | assert(cfrom); | |
467 | assert(pfrom); | |
468 | assert(cto); | |
469 | assert(pto); | |
470 | ||
471 | ret = cg_migrate(cfrom, pfrom, cto, pto, flags); | |
472 | ||
473 | r = cg_enumerate_subgroups(cfrom, pfrom, &d); | |
474 | if (r < 0) { | |
475 | if (ret >= 0 && r != -ENOENT) | |
476 | return r; | |
477 | ||
478 | return ret; | |
479 | } | |
480 | ||
481 | while ((r = cg_read_subgroup(d, &fn)) > 0) { | |
482 | _cleanup_free_ char *p = NULL; | |
483 | ||
484 | p = strjoin(pfrom, "/", fn); | |
485 | free(fn); | |
486 | if (!p) | |
487 | return -ENOMEM; | |
488 | ||
489 | r = cg_migrate_recursive(cfrom, p, cto, pto, flags); | |
490 | if (r != 0 && ret >= 0) | |
491 | ret = r; | |
492 | } | |
493 | ||
494 | if (r < 0 && ret >= 0) | |
495 | ret = r; | |
496 | ||
497 | if (flags & CGROUP_REMOVE) { | |
498 | r = cg_rmdir(cfrom, pfrom); | |
499 | if (r < 0 && ret >= 0 && !IN_SET(r, -ENOENT, -EBUSY)) | |
500 | return r; | |
501 | } | |
502 | ||
503 | return ret; | |
504 | } | |
505 | ||
506 | int cg_migrate_recursive_fallback( | |
507 | const char *cfrom, | |
508 | const char *pfrom, | |
509 | const char *cto, | |
510 | const char *pto, | |
511 | CGroupFlags flags) { | |
512 | ||
513 | int r; | |
514 | ||
515 | assert(cfrom); | |
516 | assert(pfrom); | |
517 | assert(cto); | |
518 | assert(pto); | |
519 | ||
520 | r = cg_migrate_recursive(cfrom, pfrom, cto, pto, flags); | |
521 | if (r < 0) { | |
522 | char prefix[strlen(pto) + 1]; | |
523 | ||
524 | /* This didn't work? Then let's try all prefixes of the destination */ | |
525 | ||
526 | PATH_FOREACH_PREFIX(prefix, pto) { | |
527 | int q; | |
528 | ||
529 | q = cg_migrate_recursive(cfrom, pfrom, cto, prefix, flags); | |
530 | if (q >= 0) | |
531 | return q; | |
532 | } | |
533 | } | |
534 | ||
535 | return r; | |
536 | } | |
537 | ||
538 | static const char *controller_to_dirname(const char *controller) { | |
539 | const char *e; | |
540 | ||
541 | assert(controller); | |
542 | ||
543 | /* Converts a controller name to the directory name below | |
544 | * /sys/fs/cgroup/ we want to mount it to. Effectively, this | |
545 | * just cuts off the name= prefixed used for named | |
546 | * hierarchies, if it is specified. */ | |
547 | ||
548 | if (streq(controller, SYSTEMD_CGROUP_CONTROLLER)) { | |
549 | if (cg_hybrid_unified() > 0) | |
550 | controller = SYSTEMD_CGROUP_CONTROLLER_HYBRID; | |
551 | else | |
552 | controller = SYSTEMD_CGROUP_CONTROLLER_LEGACY; | |
553 | } | |
554 | ||
555 | e = startswith(controller, "name="); | |
556 | if (e) | |
557 | return e; | |
558 | ||
559 | return controller; | |
560 | } | |
561 | ||
562 | static int join_path_legacy(const char *controller, const char *path, const char *suffix, char **fs) { | |
563 | const char *dn; | |
564 | char *t = NULL; | |
565 | ||
566 | assert(fs); | |
567 | assert(controller); | |
568 | ||
569 | dn = controller_to_dirname(controller); | |
570 | ||
571 | if (isempty(path) && isempty(suffix)) | |
572 | t = strappend("/sys/fs/cgroup/", dn); | |
573 | else if (isempty(path)) | |
574 | t = strjoin("/sys/fs/cgroup/", dn, "/", suffix); | |
575 | else if (isempty(suffix)) | |
576 | t = strjoin("/sys/fs/cgroup/", dn, "/", path); | |
577 | else | |
578 | t = strjoin("/sys/fs/cgroup/", dn, "/", path, "/", suffix); | |
579 | if (!t) | |
580 | return -ENOMEM; | |
581 | ||
582 | *fs = t; | |
583 | return 0; | |
584 | } | |
585 | ||
586 | static int join_path_unified(const char *path, const char *suffix, char **fs) { | |
587 | char *t; | |
588 | ||
589 | assert(fs); | |
590 | ||
591 | if (isempty(path) && isempty(suffix)) | |
592 | t = strdup("/sys/fs/cgroup"); | |
593 | else if (isempty(path)) | |
594 | t = strappend("/sys/fs/cgroup/", suffix); | |
595 | else if (isempty(suffix)) | |
596 | t = strappend("/sys/fs/cgroup/", path); | |
597 | else | |
598 | t = strjoin("/sys/fs/cgroup/", path, "/", suffix); | |
599 | if (!t) | |
600 | return -ENOMEM; | |
601 | ||
602 | *fs = t; | |
603 | return 0; | |
604 | } | |
605 | ||
606 | int cg_get_path(const char *controller, const char *path, const char *suffix, char **fs) { | |
607 | int r; | |
608 | ||
609 | assert(fs); | |
610 | ||
611 | if (!controller) { | |
612 | char *t; | |
613 | ||
614 | /* If no controller is specified, we return the path | |
615 | * *below* the controllers, without any prefix. */ | |
616 | ||
617 | if (!path && !suffix) | |
618 | return -EINVAL; | |
619 | ||
620 | if (!suffix) | |
621 | t = strdup(path); | |
622 | else if (!path) | |
623 | t = strdup(suffix); | |
624 | else | |
625 | t = strjoin(path, "/", suffix); | |
626 | if (!t) | |
627 | return -ENOMEM; | |
628 | ||
629 | *fs = path_simplify(t, false); | |
630 | return 0; | |
631 | } | |
632 | ||
633 | if (!cg_controller_is_valid(controller)) | |
634 | return -EINVAL; | |
635 | ||
636 | r = cg_all_unified(); | |
637 | if (r < 0) | |
638 | return r; | |
639 | if (r > 0) | |
640 | r = join_path_unified(path, suffix, fs); | |
641 | else | |
642 | r = join_path_legacy(controller, path, suffix, fs); | |
643 | if (r < 0) | |
644 | return r; | |
645 | ||
646 | path_simplify(*fs, false); | |
647 | return 0; | |
648 | } | |
649 | ||
650 | static int controller_is_accessible(const char *controller) { | |
651 | int r; | |
652 | ||
653 | assert(controller); | |
654 | ||
655 | /* Checks whether a specific controller is accessible, | |
656 | * i.e. its hierarchy mounted. In the unified hierarchy all | |
657 | * controllers are considered accessible, except for the named | |
658 | * hierarchies */ | |
659 | ||
660 | if (!cg_controller_is_valid(controller)) | |
661 | return -EINVAL; | |
662 | ||
663 | r = cg_all_unified(); | |
664 | if (r < 0) | |
665 | return r; | |
666 | if (r > 0) { | |
667 | /* We don't support named hierarchies if we are using | |
668 | * the unified hierarchy. */ | |
669 | ||
670 | if (streq(controller, SYSTEMD_CGROUP_CONTROLLER)) | |
671 | return 0; | |
672 | ||
673 | if (startswith(controller, "name=")) | |
674 | return -EOPNOTSUPP; | |
675 | ||
676 | } else { | |
677 | const char *cc, *dn; | |
678 | ||
679 | dn = controller_to_dirname(controller); | |
680 | cc = strjoina("/sys/fs/cgroup/", dn); | |
681 | ||
682 | if (laccess(cc, F_OK) < 0) | |
683 | return -errno; | |
684 | } | |
685 | ||
686 | return 0; | |
687 | } | |
688 | ||
689 | int cg_get_path_and_check(const char *controller, const char *path, const char *suffix, char **fs) { | |
690 | int r; | |
691 | ||
692 | assert(controller); | |
693 | assert(fs); | |
694 | ||
695 | /* Check if the specified controller is actually accessible */ | |
696 | r = controller_is_accessible(controller); | |
697 | if (r < 0) | |
698 | return r; | |
699 | ||
700 | return cg_get_path(controller, path, suffix, fs); | |
701 | } | |
702 | ||
703 | static int trim_cb(const char *path, const struct stat *sb, int typeflag, struct FTW *ftwbuf) { | |
704 | assert(path); | |
705 | assert(sb); | |
706 | assert(ftwbuf); | |
707 | ||
708 | if (typeflag != FTW_DP) | |
709 | return 0; | |
710 | ||
711 | if (ftwbuf->level < 1) | |
712 | return 0; | |
713 | ||
714 | (void) rmdir(path); | |
715 | return 0; | |
716 | } | |
717 | ||
718 | int cg_trim(const char *controller, const char *path, bool delete_root) { | |
719 | _cleanup_free_ char *fs = NULL; | |
720 | int r = 0, q; | |
721 | ||
722 | assert(path); | |
723 | ||
724 | r = cg_get_path(controller, path, NULL, &fs); | |
725 | if (r < 0) | |
726 | return r; | |
727 | ||
728 | errno = 0; | |
729 | if (nftw(fs, trim_cb, 64, FTW_DEPTH|FTW_MOUNT|FTW_PHYS) != 0) { | |
730 | if (errno == ENOENT) | |
731 | r = 0; | |
732 | else if (errno > 0) | |
733 | r = -errno; | |
734 | else | |
735 | r = -EIO; | |
736 | } | |
737 | ||
738 | if (delete_root) { | |
739 | if (rmdir(fs) < 0 && errno != ENOENT) | |
740 | return -errno; | |
741 | } | |
742 | ||
743 | q = cg_hybrid_unified(); | |
744 | if (q < 0) | |
745 | return q; | |
746 | if (q > 0 && streq(controller, SYSTEMD_CGROUP_CONTROLLER)) { | |
747 | q = cg_trim(SYSTEMD_CGROUP_CONTROLLER_LEGACY, path, delete_root); | |
748 | if (q < 0) | |
749 | log_warning_errno(q, "Failed to trim compat systemd cgroup %s: %m", path); | |
750 | } | |
751 | ||
752 | return r; | |
753 | } | |
754 | ||
755 | /* Create a cgroup in the hierarchy of controller. | |
756 | * Returns 0 if the group already existed, 1 on success, negative otherwise. | |
757 | */ | |
758 | int cg_create(const char *controller, const char *path) { | |
759 | _cleanup_free_ char *fs = NULL; | |
760 | int r; | |
761 | ||
762 | r = cg_get_path_and_check(controller, path, NULL, &fs); | |
763 | if (r < 0) | |
764 | return r; | |
765 | ||
766 | r = mkdir_parents(fs, 0755); | |
767 | if (r < 0) | |
768 | return r; | |
769 | ||
770 | r = mkdir_errno_wrapper(fs, 0755); | |
771 | if (r == -EEXIST) | |
772 | return 0; | |
773 | if (r < 0) | |
774 | return r; | |
775 | ||
776 | r = cg_hybrid_unified(); | |
777 | if (r < 0) | |
778 | return r; | |
779 | ||
780 | if (r > 0 && streq(controller, SYSTEMD_CGROUP_CONTROLLER)) { | |
781 | r = cg_create(SYSTEMD_CGROUP_CONTROLLER_LEGACY, path); | |
782 | if (r < 0) | |
783 | log_warning_errno(r, "Failed to create compat systemd cgroup %s: %m", path); | |
784 | } | |
785 | ||
786 | return 1; | |
787 | } | |
788 | ||
789 | int cg_create_and_attach(const char *controller, const char *path, pid_t pid) { | |
790 | int r, q; | |
791 | ||
792 | assert(pid >= 0); | |
793 | ||
794 | r = cg_create(controller, path); | |
795 | if (r < 0) | |
796 | return r; | |
797 | ||
798 | q = cg_attach(controller, path, pid); | |
799 | if (q < 0) | |
800 | return q; | |
801 | ||
802 | /* This does not remove the cgroup on failure */ | |
803 | return r; | |
804 | } | |
805 | ||
806 | int cg_attach(const char *controller, const char *path, pid_t pid) { | |
807 | _cleanup_free_ char *fs = NULL; | |
808 | char c[DECIMAL_STR_MAX(pid_t) + 2]; | |
809 | int r; | |
810 | ||
811 | assert(path); | |
812 | assert(pid >= 0); | |
813 | ||
814 | r = cg_get_path_and_check(controller, path, "cgroup.procs", &fs); | |
815 | if (r < 0) | |
816 | return r; | |
817 | ||
818 | if (pid == 0) | |
819 | pid = getpid_cached(); | |
820 | ||
821 | xsprintf(c, PID_FMT "\n", pid); | |
822 | ||
823 | r = write_string_file(fs, c, 0); | |
824 | if (r < 0) | |
825 | return r; | |
826 | ||
827 | r = cg_hybrid_unified(); | |
828 | if (r < 0) | |
829 | return r; | |
830 | ||
831 | if (r > 0 && streq(controller, SYSTEMD_CGROUP_CONTROLLER)) { | |
832 | r = cg_attach(SYSTEMD_CGROUP_CONTROLLER_LEGACY, path, pid); | |
833 | if (r < 0) | |
834 | log_warning_errno(r, "Failed to attach "PID_FMT" to compat systemd cgroup %s: %m", pid, path); | |
835 | } | |
836 | ||
837 | return 0; | |
838 | } | |
839 | ||
840 | int cg_attach_fallback(const char *controller, const char *path, pid_t pid) { | |
841 | int r; | |
842 | ||
843 | assert(controller); | |
844 | assert(path); | |
845 | assert(pid >= 0); | |
846 | ||
847 | r = cg_attach(controller, path, pid); | |
848 | if (r < 0) { | |
849 | char prefix[strlen(path) + 1]; | |
850 | ||
851 | /* This didn't work? Then let's try all prefixes of | |
852 | * the destination */ | |
853 | ||
854 | PATH_FOREACH_PREFIX(prefix, path) { | |
855 | int q; | |
856 | ||
857 | q = cg_attach(controller, prefix, pid); | |
858 | if (q >= 0) | |
859 | return q; | |
860 | } | |
861 | } | |
862 | ||
863 | return r; | |
864 | } | |
865 | ||
866 | int cg_set_access( | |
867 | const char *controller, | |
868 | const char *path, | |
869 | uid_t uid, | |
870 | gid_t gid) { | |
871 | ||
872 | struct Attribute { | |
873 | const char *name; | |
874 | bool fatal; | |
875 | }; | |
876 | ||
877 | /* cgroupsv1, aka legacy/non-unified */ | |
878 | static const struct Attribute legacy_attributes[] = { | |
879 | { "cgroup.procs", true }, | |
880 | { "tasks", false }, | |
881 | { "cgroup.clone_children", false }, | |
882 | {}, | |
883 | }; | |
884 | ||
885 | /* cgroupsv2, aka unified */ | |
886 | static const struct Attribute unified_attributes[] = { | |
887 | { "cgroup.procs", true }, | |
888 | { "cgroup.subtree_control", true }, | |
889 | { "cgroup.threads", false }, | |
890 | {}, | |
891 | }; | |
892 | ||
893 | static const struct Attribute* const attributes[] = { | |
894 | [false] = legacy_attributes, | |
895 | [true] = unified_attributes, | |
896 | }; | |
897 | ||
898 | _cleanup_free_ char *fs = NULL; | |
899 | const struct Attribute *i; | |
900 | int r, unified; | |
901 | ||
902 | assert(path); | |
903 | ||
904 | if (uid == UID_INVALID && gid == GID_INVALID) | |
905 | return 0; | |
906 | ||
907 | unified = cg_unified_controller(controller); | |
908 | if (unified < 0) | |
909 | return unified; | |
910 | ||
911 | /* Configure access to the cgroup itself */ | |
912 | r = cg_get_path(controller, path, NULL, &fs); | |
913 | if (r < 0) | |
914 | return r; | |
915 | ||
916 | r = chmod_and_chown(fs, 0755, uid, gid); | |
917 | if (r < 0) | |
918 | return r; | |
919 | ||
920 | /* Configure access to the cgroup's attributes */ | |
921 | for (i = attributes[unified]; i->name; i++) { | |
922 | fs = mfree(fs); | |
923 | ||
924 | r = cg_get_path(controller, path, i->name, &fs); | |
925 | if (r < 0) | |
926 | return r; | |
927 | ||
928 | r = chmod_and_chown(fs, 0644, uid, gid); | |
929 | if (r < 0) { | |
930 | if (i->fatal) | |
931 | return r; | |
932 | ||
933 | log_debug_errno(r, "Failed to set access on cgroup %s, ignoring: %m", fs); | |
934 | } | |
935 | } | |
936 | ||
937 | if (streq(controller, SYSTEMD_CGROUP_CONTROLLER)) { | |
938 | r = cg_hybrid_unified(); | |
939 | if (r < 0) | |
940 | return r; | |
941 | if (r > 0) { | |
942 | /* Always propagate access mode from unified to legacy controller */ | |
943 | r = cg_set_access(SYSTEMD_CGROUP_CONTROLLER_LEGACY, path, uid, gid); | |
944 | if (r < 0) | |
945 | log_debug_errno(r, "Failed to set access on compatibility systemd cgroup %s, ignoring: %m", path); | |
946 | } | |
947 | } | |
948 | ||
949 | return 0; | |
950 | } | |
951 | ||
952 | int cg_set_xattr(const char *controller, const char *path, const char *name, const void *value, size_t size, int flags) { | |
953 | _cleanup_free_ char *fs = NULL; | |
954 | int r; | |
955 | ||
956 | assert(path); | |
957 | assert(name); | |
958 | assert(value || size <= 0); | |
959 | ||
960 | r = cg_get_path(controller, path, NULL, &fs); | |
961 | if (r < 0) | |
962 | return r; | |
963 | ||
964 | if (setxattr(fs, name, value, size, flags) < 0) | |
965 | return -errno; | |
966 | ||
967 | return 0; | |
968 | } | |
969 | ||
970 | int cg_get_xattr(const char *controller, const char *path, const char *name, void *value, size_t size) { | |
971 | _cleanup_free_ char *fs = NULL; | |
972 | ssize_t n; | |
973 | int r; | |
974 | ||
975 | assert(path); | |
976 | assert(name); | |
977 | ||
978 | r = cg_get_path(controller, path, NULL, &fs); | |
979 | if (r < 0) | |
980 | return r; | |
981 | ||
982 | n = getxattr(fs, name, value, size); | |
983 | if (n < 0) | |
984 | return -errno; | |
985 | ||
986 | return (int) n; | |
987 | } | |
988 | ||
989 | int cg_pid_get_path(const char *controller, pid_t pid, char **path) { | |
990 | _cleanup_fclose_ FILE *f = NULL; | |
991 | char line[LINE_MAX]; | |
992 | const char *fs, *controller_str; | |
993 | size_t cs = 0; | |
994 | int unified; | |
995 | ||
996 | assert(path); | |
997 | assert(pid >= 0); | |
998 | ||
999 | if (controller) { | |
1000 | if (!cg_controller_is_valid(controller)) | |
1001 | return -EINVAL; | |
1002 | } else | |
1003 | controller = SYSTEMD_CGROUP_CONTROLLER; | |
1004 | ||
1005 | unified = cg_unified_controller(controller); | |
1006 | if (unified < 0) | |
1007 | return unified; | |
1008 | if (unified == 0) { | |
1009 | if (streq(controller, SYSTEMD_CGROUP_CONTROLLER)) | |
1010 | controller_str = SYSTEMD_CGROUP_CONTROLLER_LEGACY; | |
1011 | else | |
1012 | controller_str = controller; | |
1013 | ||
1014 | cs = strlen(controller_str); | |
1015 | } | |
1016 | ||
1017 | fs = procfs_file_alloca(pid, "cgroup"); | |
1018 | f = fopen(fs, "re"); | |
1019 | if (!f) | |
1020 | return errno == ENOENT ? -ESRCH : -errno; | |
1021 | ||
1022 | (void) __fsetlocking(f, FSETLOCKING_BYCALLER); | |
1023 | ||
1024 | FOREACH_LINE(line, f, return -errno) { | |
1025 | char *e, *p; | |
1026 | ||
1027 | truncate_nl(line); | |
1028 | ||
1029 | if (unified) { | |
1030 | e = startswith(line, "0:"); | |
1031 | if (!e) | |
1032 | continue; | |
1033 | ||
1034 | e = strchr(e, ':'); | |
1035 | if (!e) | |
1036 | continue; | |
1037 | } else { | |
1038 | char *l; | |
1039 | size_t k; | |
1040 | const char *word, *state; | |
1041 | bool found = false; | |
1042 | ||
1043 | l = strchr(line, ':'); | |
1044 | if (!l) | |
1045 | continue; | |
1046 | ||
1047 | l++; | |
1048 | e = strchr(l, ':'); | |
1049 | if (!e) | |
1050 | continue; | |
1051 | ||
1052 | *e = 0; | |
1053 | FOREACH_WORD_SEPARATOR(word, k, l, ",", state) | |
1054 | if (k == cs && memcmp(word, controller_str, cs) == 0) { | |
1055 | found = true; | |
1056 | break; | |
1057 | } | |
1058 | if (!found) | |
1059 | continue; | |
1060 | } | |
1061 | ||
1062 | p = strdup(e + 1); | |
1063 | if (!p) | |
1064 | return -ENOMEM; | |
1065 | ||
1066 | /* Truncate suffix indicating the process is a zombie */ | |
1067 | e = endswith(p, " (deleted)"); | |
1068 | if (e) | |
1069 | *e = 0; | |
1070 | ||
1071 | *path = p; | |
1072 | return 0; | |
1073 | } | |
1074 | ||
1075 | return -ENODATA; | |
1076 | } | |
1077 | ||
1078 | int cg_install_release_agent(const char *controller, const char *agent) { | |
1079 | _cleanup_free_ char *fs = NULL, *contents = NULL; | |
1080 | const char *sc; | |
1081 | int r; | |
1082 | ||
1083 | assert(agent); | |
1084 | ||
1085 | r = cg_unified_controller(controller); | |
1086 | if (r < 0) | |
1087 | return r; | |
1088 | if (r > 0) /* doesn't apply to unified hierarchy */ | |
1089 | return -EOPNOTSUPP; | |
1090 | ||
1091 | r = cg_get_path(controller, NULL, "release_agent", &fs); | |
1092 | if (r < 0) | |
1093 | return r; | |
1094 | ||
1095 | r = read_one_line_file(fs, &contents); | |
1096 | if (r < 0) | |
1097 | return r; | |
1098 | ||
1099 | sc = strstrip(contents); | |
1100 | if (isempty(sc)) { | |
1101 | r = write_string_file(fs, agent, 0); | |
1102 | if (r < 0) | |
1103 | return r; | |
1104 | } else if (!path_equal(sc, agent)) | |
1105 | return -EEXIST; | |
1106 | ||
1107 | fs = mfree(fs); | |
1108 | r = cg_get_path(controller, NULL, "notify_on_release", &fs); | |
1109 | if (r < 0) | |
1110 | return r; | |
1111 | ||
1112 | contents = mfree(contents); | |
1113 | r = read_one_line_file(fs, &contents); | |
1114 | if (r < 0) | |
1115 | return r; | |
1116 | ||
1117 | sc = strstrip(contents); | |
1118 | if (streq(sc, "0")) { | |
1119 | r = write_string_file(fs, "1", 0); | |
1120 | if (r < 0) | |
1121 | return r; | |
1122 | ||
1123 | return 1; | |
1124 | } | |
1125 | ||
1126 | if (!streq(sc, "1")) | |
1127 | return -EIO; | |
1128 | ||
1129 | return 0; | |
1130 | } | |
1131 | ||
1132 | int cg_uninstall_release_agent(const char *controller) { | |
1133 | _cleanup_free_ char *fs = NULL; | |
1134 | int r; | |
1135 | ||
1136 | r = cg_unified_controller(controller); | |
1137 | if (r < 0) | |
1138 | return r; | |
1139 | if (r > 0) /* Doesn't apply to unified hierarchy */ | |
1140 | return -EOPNOTSUPP; | |
1141 | ||
1142 | r = cg_get_path(controller, NULL, "notify_on_release", &fs); | |
1143 | if (r < 0) | |
1144 | return r; | |
1145 | ||
1146 | r = write_string_file(fs, "0", 0); | |
1147 | if (r < 0) | |
1148 | return r; | |
1149 | ||
1150 | fs = mfree(fs); | |
1151 | ||
1152 | r = cg_get_path(controller, NULL, "release_agent", &fs); | |
1153 | if (r < 0) | |
1154 | return r; | |
1155 | ||
1156 | r = write_string_file(fs, "", 0); | |
1157 | if (r < 0) | |
1158 | return r; | |
1159 | ||
1160 | return 0; | |
1161 | } | |
1162 | ||
1163 | int cg_is_empty(const char *controller, const char *path) { | |
1164 | _cleanup_fclose_ FILE *f = NULL; | |
1165 | pid_t pid; | |
1166 | int r; | |
1167 | ||
1168 | assert(path); | |
1169 | ||
1170 | r = cg_enumerate_processes(controller, path, &f); | |
1171 | if (r == -ENOENT) | |
1172 | return 1; | |
1173 | if (r < 0) | |
1174 | return r; | |
1175 | ||
1176 | r = cg_read_pid(f, &pid); | |
1177 | if (r < 0) | |
1178 | return r; | |
1179 | ||
1180 | return r == 0; | |
1181 | } | |
1182 | ||
1183 | int cg_is_empty_recursive(const char *controller, const char *path) { | |
1184 | int r; | |
1185 | ||
1186 | assert(path); | |
1187 | ||
1188 | /* The root cgroup is always populated */ | |
1189 | if (controller && empty_or_root(path)) | |
1190 | return false; | |
1191 | ||
1192 | r = cg_unified_controller(controller); | |
1193 | if (r < 0) | |
1194 | return r; | |
1195 | if (r > 0) { | |
1196 | _cleanup_free_ char *t = NULL; | |
1197 | ||
1198 | /* On the unified hierarchy we can check empty state | |
1199 | * via the "populated" attribute of "cgroup.events". */ | |
1200 | ||
1201 | r = cg_read_event(controller, path, "populated", &t); | |
1202 | if (r < 0) | |
1203 | return r; | |
1204 | ||
1205 | return streq(t, "0"); | |
1206 | } else { | |
1207 | _cleanup_closedir_ DIR *d = NULL; | |
1208 | char *fn; | |
1209 | ||
1210 | r = cg_is_empty(controller, path); | |
1211 | if (r <= 0) | |
1212 | return r; | |
1213 | ||
1214 | r = cg_enumerate_subgroups(controller, path, &d); | |
1215 | if (r == -ENOENT) | |
1216 | return 1; | |
1217 | if (r < 0) | |
1218 | return r; | |
1219 | ||
1220 | while ((r = cg_read_subgroup(d, &fn)) > 0) { | |
1221 | _cleanup_free_ char *p = NULL; | |
1222 | ||
1223 | p = strjoin(path, "/", fn); | |
1224 | free(fn); | |
1225 | if (!p) | |
1226 | return -ENOMEM; | |
1227 | ||
1228 | r = cg_is_empty_recursive(controller, p); | |
1229 | if (r <= 0) | |
1230 | return r; | |
1231 | } | |
1232 | if (r < 0) | |
1233 | return r; | |
1234 | ||
1235 | return true; | |
1236 | } | |
1237 | } | |
1238 | ||
1239 | int cg_split_spec(const char *spec, char **controller, char **path) { | |
1240 | char *t = NULL, *u = NULL; | |
1241 | const char *e; | |
1242 | ||
1243 | assert(spec); | |
1244 | ||
1245 | if (*spec == '/') { | |
1246 | if (!path_is_normalized(spec)) | |
1247 | return -EINVAL; | |
1248 | ||
1249 | if (path) { | |
1250 | t = strdup(spec); | |
1251 | if (!t) | |
1252 | return -ENOMEM; | |
1253 | ||
1254 | *path = path_simplify(t, false); | |
1255 | } | |
1256 | ||
1257 | if (controller) | |
1258 | *controller = NULL; | |
1259 | ||
1260 | return 0; | |
1261 | } | |
1262 | ||
1263 | e = strchr(spec, ':'); | |
1264 | if (!e) { | |
1265 | if (!cg_controller_is_valid(spec)) | |
1266 | return -EINVAL; | |
1267 | ||
1268 | if (controller) { | |
1269 | t = strdup(spec); | |
1270 | if (!t) | |
1271 | return -ENOMEM; | |
1272 | ||
1273 | *controller = t; | |
1274 | } | |
1275 | ||
1276 | if (path) | |
1277 | *path = NULL; | |
1278 | ||
1279 | return 0; | |
1280 | } | |
1281 | ||
1282 | t = strndup(spec, e-spec); | |
1283 | if (!t) | |
1284 | return -ENOMEM; | |
1285 | if (!cg_controller_is_valid(t)) { | |
1286 | free(t); | |
1287 | return -EINVAL; | |
1288 | } | |
1289 | ||
1290 | if (isempty(e+1)) | |
1291 | u = NULL; | |
1292 | else { | |
1293 | u = strdup(e+1); | |
1294 | if (!u) { | |
1295 | free(t); | |
1296 | return -ENOMEM; | |
1297 | } | |
1298 | ||
1299 | if (!path_is_normalized(u) || | |
1300 | !path_is_absolute(u)) { | |
1301 | free(t); | |
1302 | free(u); | |
1303 | return -EINVAL; | |
1304 | } | |
1305 | ||
1306 | path_simplify(u, false); | |
1307 | } | |
1308 | ||
1309 | if (controller) | |
1310 | *controller = t; | |
1311 | else | |
1312 | free(t); | |
1313 | ||
1314 | if (path) | |
1315 | *path = u; | |
1316 | else | |
1317 | free(u); | |
1318 | ||
1319 | return 0; | |
1320 | } | |
1321 | ||
1322 | int cg_mangle_path(const char *path, char **result) { | |
1323 | _cleanup_free_ char *c = NULL, *p = NULL; | |
1324 | char *t; | |
1325 | int r; | |
1326 | ||
1327 | assert(path); | |
1328 | assert(result); | |
1329 | ||
1330 | /* First, check if it already is a filesystem path */ | |
1331 | if (path_startswith(path, "/sys/fs/cgroup")) { | |
1332 | ||
1333 | t = strdup(path); | |
1334 | if (!t) | |
1335 | return -ENOMEM; | |
1336 | ||
1337 | *result = path_simplify(t, false); | |
1338 | return 0; | |
1339 | } | |
1340 | ||
1341 | /* Otherwise, treat it as cg spec */ | |
1342 | r = cg_split_spec(path, &c, &p); | |
1343 | if (r < 0) | |
1344 | return r; | |
1345 | ||
1346 | return cg_get_path(c ?: SYSTEMD_CGROUP_CONTROLLER, p ?: "/", NULL, result); | |
1347 | } | |
1348 | ||
1349 | int cg_get_root_path(char **path) { | |
1350 | char *p, *e; | |
1351 | int r; | |
1352 | ||
1353 | assert(path); | |
1354 | ||
1355 | r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 1, &p); | |
1356 | if (r < 0) | |
1357 | return r; | |
1358 | ||
1359 | e = endswith(p, "/" SPECIAL_INIT_SCOPE); | |
1360 | if (!e) | |
1361 | e = endswith(p, "/" SPECIAL_SYSTEM_SLICE); /* legacy */ | |
1362 | if (!e) | |
1363 | e = endswith(p, "/system"); /* even more legacy */ | |
1364 | if (e) | |
1365 | *e = 0; | |
1366 | ||
1367 | *path = p; | |
1368 | return 0; | |
1369 | } | |
1370 | ||
1371 | int cg_shift_path(const char *cgroup, const char *root, const char **shifted) { | |
1372 | _cleanup_free_ char *rt = NULL; | |
1373 | char *p; | |
1374 | int r; | |
1375 | ||
1376 | assert(cgroup); | |
1377 | assert(shifted); | |
1378 | ||
1379 | if (!root) { | |
1380 | /* If the root was specified let's use that, otherwise | |
1381 | * let's determine it from PID 1 */ | |
1382 | ||
1383 | r = cg_get_root_path(&rt); | |
1384 | if (r < 0) | |
1385 | return r; | |
1386 | ||
1387 | root = rt; | |
1388 | } | |
1389 | ||
1390 | p = path_startswith(cgroup, root); | |
1391 | if (p && p > cgroup) | |
1392 | *shifted = p - 1; | |
1393 | else | |
1394 | *shifted = cgroup; | |
1395 | ||
1396 | return 0; | |
1397 | } | |
1398 | ||
1399 | int cg_pid_get_path_shifted(pid_t pid, const char *root, char **cgroup) { | |
1400 | _cleanup_free_ char *raw = NULL; | |
1401 | const char *c; | |
1402 | int r; | |
1403 | ||
1404 | assert(pid >= 0); | |
1405 | assert(cgroup); | |
1406 | ||
1407 | r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, pid, &raw); | |
1408 | if (r < 0) | |
1409 | return r; | |
1410 | ||
1411 | r = cg_shift_path(raw, root, &c); | |
1412 | if (r < 0) | |
1413 | return r; | |
1414 | ||
1415 | if (c == raw) | |
1416 | *cgroup = TAKE_PTR(raw); | |
1417 | else { | |
1418 | char *n; | |
1419 | ||
1420 | n = strdup(c); | |
1421 | if (!n) | |
1422 | return -ENOMEM; | |
1423 | ||
1424 | *cgroup = n; | |
1425 | } | |
1426 | ||
1427 | return 0; | |
1428 | } | |
1429 | ||
1430 | int cg_path_decode_unit(const char *cgroup, char **unit) { | |
1431 | char *c, *s; | |
1432 | size_t n; | |
1433 | ||
1434 | assert(cgroup); | |
1435 | assert(unit); | |
1436 | ||
1437 | n = strcspn(cgroup, "/"); | |
1438 | if (n < 3) | |
1439 | return -ENXIO; | |
1440 | ||
1441 | c = strndupa(cgroup, n); | |
1442 | c = cg_unescape(c); | |
1443 | ||
1444 | if (!unit_name_is_valid(c, UNIT_NAME_PLAIN|UNIT_NAME_INSTANCE)) | |
1445 | return -ENXIO; | |
1446 | ||
1447 | s = strdup(c); | |
1448 | if (!s) | |
1449 | return -ENOMEM; | |
1450 | ||
1451 | *unit = s; | |
1452 | return 0; | |
1453 | } | |
1454 | ||
1455 | static bool valid_slice_name(const char *p, size_t n) { | |
1456 | ||
1457 | if (!p) | |
1458 | return false; | |
1459 | ||
1460 | if (n < STRLEN("x.slice")) | |
1461 | return false; | |
1462 | ||
1463 | if (memcmp(p + n - 6, ".slice", 6) == 0) { | |
1464 | char buf[n+1], *c; | |
1465 | ||
1466 | memcpy(buf, p, n); | |
1467 | buf[n] = 0; | |
1468 | ||
1469 | c = cg_unescape(buf); | |
1470 | ||
1471 | return unit_name_is_valid(c, UNIT_NAME_PLAIN); | |
1472 | } | |
1473 | ||
1474 | return false; | |
1475 | } | |
1476 | ||
1477 | static const char *skip_slices(const char *p) { | |
1478 | assert(p); | |
1479 | ||
1480 | /* Skips over all slice assignments */ | |
1481 | ||
1482 | for (;;) { | |
1483 | size_t n; | |
1484 | ||
1485 | p += strspn(p, "/"); | |
1486 | ||
1487 | n = strcspn(p, "/"); | |
1488 | if (!valid_slice_name(p, n)) | |
1489 | return p; | |
1490 | ||
1491 | p += n; | |
1492 | } | |
1493 | } | |
1494 | ||
1495 | int cg_path_get_unit(const char *path, char **ret) { | |
1496 | const char *e; | |
1497 | char *unit; | |
1498 | int r; | |
1499 | ||
1500 | assert(path); | |
1501 | assert(ret); | |
1502 | ||
1503 | e = skip_slices(path); | |
1504 | ||
1505 | r = cg_path_decode_unit(e, &unit); | |
1506 | if (r < 0) | |
1507 | return r; | |
1508 | ||
1509 | /* We skipped over the slices, don't accept any now */ | |
1510 | if (endswith(unit, ".slice")) { | |
1511 | free(unit); | |
1512 | return -ENXIO; | |
1513 | } | |
1514 | ||
1515 | *ret = unit; | |
1516 | return 0; | |
1517 | } | |
1518 | ||
1519 | int cg_pid_get_unit(pid_t pid, char **unit) { | |
1520 | _cleanup_free_ char *cgroup = NULL; | |
1521 | int r; | |
1522 | ||
1523 | assert(unit); | |
1524 | ||
1525 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); | |
1526 | if (r < 0) | |
1527 | return r; | |
1528 | ||
1529 | return cg_path_get_unit(cgroup, unit); | |
1530 | } | |
1531 | ||
1532 | /** | |
1533 | * Skip session-*.scope, but require it to be there. | |
1534 | */ | |
1535 | static const char *skip_session(const char *p) { | |
1536 | size_t n; | |
1537 | ||
1538 | if (isempty(p)) | |
1539 | return NULL; | |
1540 | ||
1541 | p += strspn(p, "/"); | |
1542 | ||
1543 | n = strcspn(p, "/"); | |
1544 | if (n < STRLEN("session-x.scope")) | |
1545 | return NULL; | |
1546 | ||
1547 | if (memcmp(p, "session-", 8) == 0 && memcmp(p + n - 6, ".scope", 6) == 0) { | |
1548 | char buf[n - 8 - 6 + 1]; | |
1549 | ||
1550 | memcpy(buf, p + 8, n - 8 - 6); | |
1551 | buf[n - 8 - 6] = 0; | |
1552 | ||
1553 | /* Note that session scopes never need unescaping, | |
1554 | * since they cannot conflict with the kernel's own | |
1555 | * names, hence we don't need to call cg_unescape() | |
1556 | * here. */ | |
1557 | ||
1558 | if (!session_id_valid(buf)) | |
1559 | return false; | |
1560 | ||
1561 | p += n; | |
1562 | p += strspn(p, "/"); | |
1563 | return p; | |
1564 | } | |
1565 | ||
1566 | return NULL; | |
1567 | } | |
1568 | ||
1569 | /** | |
1570 | * Skip user@*.service, but require it to be there. | |
1571 | */ | |
1572 | static const char *skip_user_manager(const char *p) { | |
1573 | size_t n; | |
1574 | ||
1575 | if (isempty(p)) | |
1576 | return NULL; | |
1577 | ||
1578 | p += strspn(p, "/"); | |
1579 | ||
1580 | n = strcspn(p, "/"); | |
1581 | if (n < STRLEN("user@x.service")) | |
1582 | return NULL; | |
1583 | ||
1584 | if (memcmp(p, "user@", 5) == 0 && memcmp(p + n - 8, ".service", 8) == 0) { | |
1585 | char buf[n - 5 - 8 + 1]; | |
1586 | ||
1587 | memcpy(buf, p + 5, n - 5 - 8); | |
1588 | buf[n - 5 - 8] = 0; | |
1589 | ||
1590 | /* Note that user manager services never need unescaping, | |
1591 | * since they cannot conflict with the kernel's own | |
1592 | * names, hence we don't need to call cg_unescape() | |
1593 | * here. */ | |
1594 | ||
1595 | if (parse_uid(buf, NULL) < 0) | |
1596 | return NULL; | |
1597 | ||
1598 | p += n; | |
1599 | p += strspn(p, "/"); | |
1600 | ||
1601 | return p; | |
1602 | } | |
1603 | ||
1604 | return NULL; | |
1605 | } | |
1606 | ||
1607 | static const char *skip_user_prefix(const char *path) { | |
1608 | const char *e, *t; | |
1609 | ||
1610 | assert(path); | |
1611 | ||
1612 | /* Skip slices, if there are any */ | |
1613 | e = skip_slices(path); | |
1614 | ||
1615 | /* Skip the user manager, if it's in the path now... */ | |
1616 | t = skip_user_manager(e); | |
1617 | if (t) | |
1618 | return t; | |
1619 | ||
1620 | /* Alternatively skip the user session if it is in the path... */ | |
1621 | return skip_session(e); | |
1622 | } | |
1623 | ||
1624 | int cg_path_get_user_unit(const char *path, char **ret) { | |
1625 | const char *t; | |
1626 | ||
1627 | assert(path); | |
1628 | assert(ret); | |
1629 | ||
1630 | t = skip_user_prefix(path); | |
1631 | if (!t) | |
1632 | return -ENXIO; | |
1633 | ||
1634 | /* And from here on it looks pretty much the same as for a | |
1635 | * system unit, hence let's use the same parser from here | |
1636 | * on. */ | |
1637 | return cg_path_get_unit(t, ret); | |
1638 | } | |
1639 | ||
1640 | int cg_pid_get_user_unit(pid_t pid, char **unit) { | |
1641 | _cleanup_free_ char *cgroup = NULL; | |
1642 | int r; | |
1643 | ||
1644 | assert(unit); | |
1645 | ||
1646 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); | |
1647 | if (r < 0) | |
1648 | return r; | |
1649 | ||
1650 | return cg_path_get_user_unit(cgroup, unit); | |
1651 | } | |
1652 | ||
1653 | int cg_path_get_machine_name(const char *path, char **machine) { | |
1654 | _cleanup_free_ char *u = NULL; | |
1655 | const char *sl; | |
1656 | int r; | |
1657 | ||
1658 | r = cg_path_get_unit(path, &u); | |
1659 | if (r < 0) | |
1660 | return r; | |
1661 | ||
1662 | sl = strjoina("/run/systemd/machines/unit:", u); | |
1663 | return readlink_malloc(sl, machine); | |
1664 | } | |
1665 | ||
1666 | int cg_pid_get_machine_name(pid_t pid, char **machine) { | |
1667 | _cleanup_free_ char *cgroup = NULL; | |
1668 | int r; | |
1669 | ||
1670 | assert(machine); | |
1671 | ||
1672 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); | |
1673 | if (r < 0) | |
1674 | return r; | |
1675 | ||
1676 | return cg_path_get_machine_name(cgroup, machine); | |
1677 | } | |
1678 | ||
1679 | int cg_path_get_session(const char *path, char **session) { | |
1680 | _cleanup_free_ char *unit = NULL; | |
1681 | char *start, *end; | |
1682 | int r; | |
1683 | ||
1684 | assert(path); | |
1685 | ||
1686 | r = cg_path_get_unit(path, &unit); | |
1687 | if (r < 0) | |
1688 | return r; | |
1689 | ||
1690 | start = startswith(unit, "session-"); | |
1691 | if (!start) | |
1692 | return -ENXIO; | |
1693 | end = endswith(start, ".scope"); | |
1694 | if (!end) | |
1695 | return -ENXIO; | |
1696 | ||
1697 | *end = 0; | |
1698 | if (!session_id_valid(start)) | |
1699 | return -ENXIO; | |
1700 | ||
1701 | if (session) { | |
1702 | char *rr; | |
1703 | ||
1704 | rr = strdup(start); | |
1705 | if (!rr) | |
1706 | return -ENOMEM; | |
1707 | ||
1708 | *session = rr; | |
1709 | } | |
1710 | ||
1711 | return 0; | |
1712 | } | |
1713 | ||
1714 | int cg_pid_get_session(pid_t pid, char **session) { | |
1715 | _cleanup_free_ char *cgroup = NULL; | |
1716 | int r; | |
1717 | ||
1718 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); | |
1719 | if (r < 0) | |
1720 | return r; | |
1721 | ||
1722 | return cg_path_get_session(cgroup, session); | |
1723 | } | |
1724 | ||
1725 | int cg_path_get_owner_uid(const char *path, uid_t *uid) { | |
1726 | _cleanup_free_ char *slice = NULL; | |
1727 | char *start, *end; | |
1728 | int r; | |
1729 | ||
1730 | assert(path); | |
1731 | ||
1732 | r = cg_path_get_slice(path, &slice); | |
1733 | if (r < 0) | |
1734 | return r; | |
1735 | ||
1736 | start = startswith(slice, "user-"); | |
1737 | if (!start) | |
1738 | return -ENXIO; | |
1739 | end = endswith(start, ".slice"); | |
1740 | if (!end) | |
1741 | return -ENXIO; | |
1742 | ||
1743 | *end = 0; | |
1744 | if (parse_uid(start, uid) < 0) | |
1745 | return -ENXIO; | |
1746 | ||
1747 | return 0; | |
1748 | } | |
1749 | ||
1750 | int cg_pid_get_owner_uid(pid_t pid, uid_t *uid) { | |
1751 | _cleanup_free_ char *cgroup = NULL; | |
1752 | int r; | |
1753 | ||
1754 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); | |
1755 | if (r < 0) | |
1756 | return r; | |
1757 | ||
1758 | return cg_path_get_owner_uid(cgroup, uid); | |
1759 | } | |
1760 | ||
1761 | int cg_path_get_slice(const char *p, char **slice) { | |
1762 | const char *e = NULL; | |
1763 | ||
1764 | assert(p); | |
1765 | assert(slice); | |
1766 | ||
1767 | /* Finds the right-most slice unit from the beginning, but | |
1768 | * stops before we come to the first non-slice unit. */ | |
1769 | ||
1770 | for (;;) { | |
1771 | size_t n; | |
1772 | ||
1773 | p += strspn(p, "/"); | |
1774 | ||
1775 | n = strcspn(p, "/"); | |
1776 | if (!valid_slice_name(p, n)) { | |
1777 | ||
1778 | if (!e) { | |
1779 | char *s; | |
1780 | ||
1781 | s = strdup(SPECIAL_ROOT_SLICE); | |
1782 | if (!s) | |
1783 | return -ENOMEM; | |
1784 | ||
1785 | *slice = s; | |
1786 | return 0; | |
1787 | } | |
1788 | ||
1789 | return cg_path_decode_unit(e, slice); | |
1790 | } | |
1791 | ||
1792 | e = p; | |
1793 | p += n; | |
1794 | } | |
1795 | } | |
1796 | ||
1797 | int cg_pid_get_slice(pid_t pid, char **slice) { | |
1798 | _cleanup_free_ char *cgroup = NULL; | |
1799 | int r; | |
1800 | ||
1801 | assert(slice); | |
1802 | ||
1803 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); | |
1804 | if (r < 0) | |
1805 | return r; | |
1806 | ||
1807 | return cg_path_get_slice(cgroup, slice); | |
1808 | } | |
1809 | ||
1810 | int cg_path_get_user_slice(const char *p, char **slice) { | |
1811 | const char *t; | |
1812 | assert(p); | |
1813 | assert(slice); | |
1814 | ||
1815 | t = skip_user_prefix(p); | |
1816 | if (!t) | |
1817 | return -ENXIO; | |
1818 | ||
1819 | /* And now it looks pretty much the same as for a system | |
1820 | * slice, so let's just use the same parser from here on. */ | |
1821 | return cg_path_get_slice(t, slice); | |
1822 | } | |
1823 | ||
1824 | int cg_pid_get_user_slice(pid_t pid, char **slice) { | |
1825 | _cleanup_free_ char *cgroup = NULL; | |
1826 | int r; | |
1827 | ||
1828 | assert(slice); | |
1829 | ||
1830 | r = cg_pid_get_path_shifted(pid, NULL, &cgroup); | |
1831 | if (r < 0) | |
1832 | return r; | |
1833 | ||
1834 | return cg_path_get_user_slice(cgroup, slice); | |
1835 | } | |
1836 | ||
1837 | char *cg_escape(const char *p) { | |
1838 | bool need_prefix = false; | |
1839 | ||
1840 | /* This implements very minimal escaping for names to be used | |
1841 | * as file names in the cgroup tree: any name which might | |
1842 | * conflict with a kernel name or is prefixed with '_' is | |
1843 | * prefixed with a '_'. That way, when reading cgroup names it | |
1844 | * is sufficient to remove a single prefixing underscore if | |
1845 | * there is one. */ | |
1846 | ||
1847 | /* The return value of this function (unlike cg_unescape()) | |
1848 | * needs free()! */ | |
1849 | ||
1850 | if (IN_SET(p[0], 0, '_', '.') || | |
1851 | streq(p, "notify_on_release") || | |
1852 | streq(p, "release_agent") || | |
1853 | streq(p, "tasks") || | |
1854 | startswith(p, "cgroup.")) | |
1855 | need_prefix = true; | |
1856 | else { | |
1857 | const char *dot; | |
1858 | ||
1859 | dot = strrchr(p, '.'); | |
1860 | if (dot) { | |
1861 | CGroupController c; | |
1862 | size_t l = dot - p; | |
1863 | ||
1864 | for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) { | |
1865 | const char *n; | |
1866 | ||
1867 | n = cgroup_controller_to_string(c); | |
1868 | ||
1869 | if (l != strlen(n)) | |
1870 | continue; | |
1871 | ||
1872 | if (memcmp(p, n, l) != 0) | |
1873 | continue; | |
1874 | ||
1875 | need_prefix = true; | |
1876 | break; | |
1877 | } | |
1878 | } | |
1879 | } | |
1880 | ||
1881 | if (need_prefix) | |
1882 | return strappend("_", p); | |
1883 | ||
1884 | return strdup(p); | |
1885 | } | |
1886 | ||
1887 | char *cg_unescape(const char *p) { | |
1888 | assert(p); | |
1889 | ||
1890 | /* The return value of this function (unlike cg_escape()) | |
1891 | * doesn't need free()! */ | |
1892 | ||
1893 | if (p[0] == '_') | |
1894 | return (char*) p+1; | |
1895 | ||
1896 | return (char*) p; | |
1897 | } | |
1898 | ||
1899 | #define CONTROLLER_VALID \ | |
1900 | DIGITS LETTERS \ | |
1901 | "_" | |
1902 | ||
1903 | bool cg_controller_is_valid(const char *p) { | |
1904 | const char *t, *s; | |
1905 | ||
1906 | if (!p) | |
1907 | return false; | |
1908 | ||
1909 | if (streq(p, SYSTEMD_CGROUP_CONTROLLER)) | |
1910 | return true; | |
1911 | ||
1912 | s = startswith(p, "name="); | |
1913 | if (s) | |
1914 | p = s; | |
1915 | ||
1916 | if (IN_SET(*p, 0, '_')) | |
1917 | return false; | |
1918 | ||
1919 | for (t = p; *t; t++) | |
1920 | if (!strchr(CONTROLLER_VALID, *t)) | |
1921 | return false; | |
1922 | ||
1923 | if (t - p > FILENAME_MAX) | |
1924 | return false; | |
1925 | ||
1926 | return true; | |
1927 | } | |
1928 | ||
1929 | int cg_slice_to_path(const char *unit, char **ret) { | |
1930 | _cleanup_free_ char *p = NULL, *s = NULL, *e = NULL; | |
1931 | const char *dash; | |
1932 | int r; | |
1933 | ||
1934 | assert(unit); | |
1935 | assert(ret); | |
1936 | ||
1937 | if (streq(unit, SPECIAL_ROOT_SLICE)) { | |
1938 | char *x; | |
1939 | ||
1940 | x = strdup(""); | |
1941 | if (!x) | |
1942 | return -ENOMEM; | |
1943 | *ret = x; | |
1944 | return 0; | |
1945 | } | |
1946 | ||
1947 | if (!unit_name_is_valid(unit, UNIT_NAME_PLAIN)) | |
1948 | return -EINVAL; | |
1949 | ||
1950 | if (!endswith(unit, ".slice")) | |
1951 | return -EINVAL; | |
1952 | ||
1953 | r = unit_name_to_prefix(unit, &p); | |
1954 | if (r < 0) | |
1955 | return r; | |
1956 | ||
1957 | dash = strchr(p, '-'); | |
1958 | ||
1959 | /* Don't allow initial dashes */ | |
1960 | if (dash == p) | |
1961 | return -EINVAL; | |
1962 | ||
1963 | while (dash) { | |
1964 | _cleanup_free_ char *escaped = NULL; | |
1965 | char n[dash - p + sizeof(".slice")]; | |
1966 | ||
1967 | #if HAS_FEATURE_MEMORY_SANITIZER | |
1968 | /* msan doesn't instrument stpncpy, so it thinks | |
1969 | * n is later used unitialized: | |
1970 | * https://github.com/google/sanitizers/issues/926 | |
1971 | */ | |
1972 | zero(n); | |
1973 | #endif | |
1974 | ||
1975 | /* Don't allow trailing or double dashes */ | |
1976 | if (IN_SET(dash[1], 0, '-')) | |
1977 | return -EINVAL; | |
1978 | ||
1979 | strcpy(stpncpy(n, p, dash - p), ".slice"); | |
1980 | if (!unit_name_is_valid(n, UNIT_NAME_PLAIN)) | |
1981 | return -EINVAL; | |
1982 | ||
1983 | escaped = cg_escape(n); | |
1984 | if (!escaped) | |
1985 | return -ENOMEM; | |
1986 | ||
1987 | if (!strextend(&s, escaped, "/", NULL)) | |
1988 | return -ENOMEM; | |
1989 | ||
1990 | dash = strchr(dash+1, '-'); | |
1991 | } | |
1992 | ||
1993 | e = cg_escape(unit); | |
1994 | if (!e) | |
1995 | return -ENOMEM; | |
1996 | ||
1997 | if (!strextend(&s, e, NULL)) | |
1998 | return -ENOMEM; | |
1999 | ||
2000 | *ret = TAKE_PTR(s); | |
2001 | ||
2002 | return 0; | |
2003 | } | |
2004 | ||
2005 | int cg_set_attribute(const char *controller, const char *path, const char *attribute, const char *value) { | |
2006 | _cleanup_free_ char *p = NULL; | |
2007 | int r; | |
2008 | ||
2009 | r = cg_get_path(controller, path, attribute, &p); | |
2010 | if (r < 0) | |
2011 | return r; | |
2012 | ||
2013 | return write_string_file(p, value, 0); | |
2014 | } | |
2015 | ||
2016 | int cg_get_attribute(const char *controller, const char *path, const char *attribute, char **ret) { | |
2017 | _cleanup_free_ char *p = NULL; | |
2018 | int r; | |
2019 | ||
2020 | r = cg_get_path(controller, path, attribute, &p); | |
2021 | if (r < 0) | |
2022 | return r; | |
2023 | ||
2024 | return read_one_line_file(p, ret); | |
2025 | } | |
2026 | ||
2027 | int cg_get_keyed_attribute( | |
2028 | const char *controller, | |
2029 | const char *path, | |
2030 | const char *attribute, | |
2031 | char **keys, | |
2032 | char **ret_values) { | |
2033 | ||
2034 | _cleanup_free_ char *filename = NULL, *contents = NULL; | |
2035 | const char *p; | |
2036 | size_t n, i, n_done = 0; | |
2037 | char **v; | |
2038 | int r; | |
2039 | ||
2040 | /* Reads one or more fields of a cgroupsv2 keyed attribute file. The 'keys' parameter should be an strv with | |
2041 | * all keys to retrieve. The 'ret_values' parameter should be passed as string size with the same number of | |
2042 | * entries as 'keys'. On success each entry will be set to the value of the matching key. | |
2043 | * | |
2044 | * If the attribute file doesn't exist at all returns ENOENT, if any key is not found returns ENXIO. */ | |
2045 | ||
2046 | r = cg_get_path(controller, path, attribute, &filename); | |
2047 | if (r < 0) | |
2048 | return r; | |
2049 | ||
2050 | r = read_full_file(filename, &contents, NULL); | |
2051 | if (r < 0) | |
2052 | return r; | |
2053 | ||
2054 | n = strv_length(keys); | |
2055 | if (n == 0) /* No keys to retrieve? That's easy, we are done then */ | |
2056 | return 0; | |
2057 | ||
2058 | /* Let's build this up in a temporary array for now in order not to clobber the return parameter on failure */ | |
2059 | v = newa0(char*, n); | |
2060 | ||
2061 | for (p = contents; *p;) { | |
2062 | const char *w = NULL; | |
2063 | ||
2064 | for (i = 0; i < n; i++) | |
2065 | if (!v[i]) { | |
2066 | w = first_word(p, keys[i]); | |
2067 | if (w) | |
2068 | break; | |
2069 | } | |
2070 | ||
2071 | if (w) { | |
2072 | size_t l; | |
2073 | ||
2074 | l = strcspn(w, NEWLINE); | |
2075 | v[i] = strndup(w, l); | |
2076 | if (!v[i]) { | |
2077 | r = -ENOMEM; | |
2078 | goto fail; | |
2079 | } | |
2080 | ||
2081 | n_done++; | |
2082 | if (n_done >= n) | |
2083 | goto done; | |
2084 | ||
2085 | p = w + l; | |
2086 | } else | |
2087 | p += strcspn(p, NEWLINE); | |
2088 | ||
2089 | p += strspn(p, NEWLINE); | |
2090 | } | |
2091 | ||
2092 | r = -ENXIO; | |
2093 | ||
2094 | fail: | |
2095 | for (i = 0; i < n; i++) | |
2096 | free(v[i]); | |
2097 | ||
2098 | return r; | |
2099 | ||
2100 | done: | |
2101 | memcpy(ret_values, v, sizeof(char*) * n); | |
2102 | return 0; | |
2103 | ||
2104 | } | |
2105 | ||
2106 | int cg_create_everywhere(CGroupMask supported, CGroupMask mask, const char *path) { | |
2107 | CGroupController c; | |
2108 | bool created; | |
2109 | int r; | |
2110 | ||
2111 | /* This one will create a cgroup in our private tree, but also | |
2112 | * duplicate it in the trees specified in mask, and remove it | |
2113 | * in all others. | |
2114 | * | |
2115 | * Returns 0 if the group already existed in the systemd hierarchy, | |
2116 | * 1 on success, negative otherwise. | |
2117 | */ | |
2118 | ||
2119 | /* First create the cgroup in our own hierarchy. */ | |
2120 | r = cg_create(SYSTEMD_CGROUP_CONTROLLER, path); | |
2121 | if (r < 0) | |
2122 | return r; | |
2123 | created = !!r; | |
2124 | ||
2125 | /* If we are in the unified hierarchy, we are done now */ | |
2126 | r = cg_all_unified(); | |
2127 | if (r < 0) | |
2128 | return r; | |
2129 | if (r > 0) | |
2130 | return created; | |
2131 | ||
2132 | /* Otherwise, do the same in the other hierarchies */ | |
2133 | for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) { | |
2134 | CGroupMask bit = CGROUP_CONTROLLER_TO_MASK(c); | |
2135 | const char *n; | |
2136 | ||
2137 | n = cgroup_controller_to_string(c); | |
2138 | ||
2139 | if (mask & bit) | |
2140 | (void) cg_create(n, path); | |
2141 | else if (supported & bit) | |
2142 | (void) cg_trim(n, path, true); | |
2143 | } | |
2144 | ||
2145 | return created; | |
2146 | } | |
2147 | ||
2148 | int cg_attach_everywhere(CGroupMask supported, const char *path, pid_t pid, cg_migrate_callback_t path_callback, void *userdata) { | |
2149 | CGroupController c; | |
2150 | int r; | |
2151 | ||
2152 | r = cg_attach(SYSTEMD_CGROUP_CONTROLLER, path, pid); | |
2153 | if (r < 0) | |
2154 | return r; | |
2155 | ||
2156 | r = cg_all_unified(); | |
2157 | if (r < 0) | |
2158 | return r; | |
2159 | if (r > 0) | |
2160 | return 0; | |
2161 | ||
2162 | for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) { | |
2163 | CGroupMask bit = CGROUP_CONTROLLER_TO_MASK(c); | |
2164 | const char *p = NULL; | |
2165 | ||
2166 | if (!(supported & bit)) | |
2167 | continue; | |
2168 | ||
2169 | if (path_callback) | |
2170 | p = path_callback(bit, userdata); | |
2171 | ||
2172 | if (!p) | |
2173 | p = path; | |
2174 | ||
2175 | (void) cg_attach_fallback(cgroup_controller_to_string(c), p, pid); | |
2176 | } | |
2177 | ||
2178 | return 0; | |
2179 | } | |
2180 | ||
2181 | int cg_attach_many_everywhere(CGroupMask supported, const char *path, Set* pids, cg_migrate_callback_t path_callback, void *userdata) { | |
2182 | Iterator i; | |
2183 | void *pidp; | |
2184 | int r = 0; | |
2185 | ||
2186 | SET_FOREACH(pidp, pids, i) { | |
2187 | pid_t pid = PTR_TO_PID(pidp); | |
2188 | int q; | |
2189 | ||
2190 | q = cg_attach_everywhere(supported, path, pid, path_callback, userdata); | |
2191 | if (q < 0 && r >= 0) | |
2192 | r = q; | |
2193 | } | |
2194 | ||
2195 | return r; | |
2196 | } | |
2197 | ||
2198 | int cg_migrate_everywhere(CGroupMask supported, const char *from, const char *to, cg_migrate_callback_t to_callback, void *userdata) { | |
2199 | CGroupController c; | |
2200 | int r = 0, q; | |
2201 | ||
2202 | if (!path_equal(from, to)) { | |
2203 | r = cg_migrate_recursive(SYSTEMD_CGROUP_CONTROLLER, from, SYSTEMD_CGROUP_CONTROLLER, to, CGROUP_REMOVE); | |
2204 | if (r < 0) | |
2205 | return r; | |
2206 | } | |
2207 | ||
2208 | q = cg_all_unified(); | |
2209 | if (q < 0) | |
2210 | return q; | |
2211 | if (q > 0) | |
2212 | return r; | |
2213 | ||
2214 | for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) { | |
2215 | CGroupMask bit = CGROUP_CONTROLLER_TO_MASK(c); | |
2216 | const char *p = NULL; | |
2217 | ||
2218 | if (!(supported & bit)) | |
2219 | continue; | |
2220 | ||
2221 | if (to_callback) | |
2222 | p = to_callback(bit, userdata); | |
2223 | ||
2224 | if (!p) | |
2225 | p = to; | |
2226 | ||
2227 | (void) cg_migrate_recursive_fallback(SYSTEMD_CGROUP_CONTROLLER, to, cgroup_controller_to_string(c), p, 0); | |
2228 | } | |
2229 | ||
2230 | return 0; | |
2231 | } | |
2232 | ||
2233 | int cg_trim_everywhere(CGroupMask supported, const char *path, bool delete_root) { | |
2234 | CGroupController c; | |
2235 | int r, q; | |
2236 | ||
2237 | r = cg_trim(SYSTEMD_CGROUP_CONTROLLER, path, delete_root); | |
2238 | if (r < 0) | |
2239 | return r; | |
2240 | ||
2241 | q = cg_all_unified(); | |
2242 | if (q < 0) | |
2243 | return q; | |
2244 | if (q > 0) | |
2245 | return r; | |
2246 | ||
2247 | for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) { | |
2248 | CGroupMask bit = CGROUP_CONTROLLER_TO_MASK(c); | |
2249 | ||
2250 | if (!(supported & bit)) | |
2251 | continue; | |
2252 | ||
2253 | (void) cg_trim(cgroup_controller_to_string(c), path, delete_root); | |
2254 | } | |
2255 | ||
2256 | return 0; | |
2257 | } | |
2258 | ||
2259 | int cg_mask_to_string(CGroupMask mask, char **ret) { | |
2260 | _cleanup_free_ char *s = NULL; | |
2261 | size_t n = 0, allocated = 0; | |
2262 | bool space = false; | |
2263 | CGroupController c; | |
2264 | ||
2265 | assert(ret); | |
2266 | ||
2267 | if (mask == 0) { | |
2268 | *ret = NULL; | |
2269 | return 0; | |
2270 | } | |
2271 | ||
2272 | for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) { | |
2273 | const char *k; | |
2274 | size_t l; | |
2275 | ||
2276 | if (!(mask & CGROUP_CONTROLLER_TO_MASK(c))) | |
2277 | continue; | |
2278 | ||
2279 | k = cgroup_controller_to_string(c); | |
2280 | l = strlen(k); | |
2281 | ||
2282 | if (!GREEDY_REALLOC(s, allocated, n + space + l + 1)) | |
2283 | return -ENOMEM; | |
2284 | ||
2285 | if (space) | |
2286 | s[n] = ' '; | |
2287 | memcpy(s + n + space, k, l); | |
2288 | n += space + l; | |
2289 | ||
2290 | space = true; | |
2291 | } | |
2292 | ||
2293 | assert(s); | |
2294 | ||
2295 | s[n] = 0; | |
2296 | *ret = TAKE_PTR(s); | |
2297 | ||
2298 | return 0; | |
2299 | } | |
2300 | ||
2301 | int cg_mask_from_string(const char *value, CGroupMask *mask) { | |
2302 | assert(mask); | |
2303 | assert(value); | |
2304 | ||
2305 | for (;;) { | |
2306 | _cleanup_free_ char *n = NULL; | |
2307 | CGroupController v; | |
2308 | int r; | |
2309 | ||
2310 | r = extract_first_word(&value, &n, NULL, 0); | |
2311 | if (r < 0) | |
2312 | return r; | |
2313 | if (r == 0) | |
2314 | break; | |
2315 | ||
2316 | v = cgroup_controller_from_string(n); | |
2317 | if (v < 0) | |
2318 | continue; | |
2319 | ||
2320 | *mask |= CGROUP_CONTROLLER_TO_MASK(v); | |
2321 | } | |
2322 | return 0; | |
2323 | } | |
2324 | ||
2325 | int cg_mask_supported(CGroupMask *ret) { | |
2326 | CGroupMask mask = 0; | |
2327 | int r; | |
2328 | ||
2329 | /* Determines the mask of supported cgroup controllers. Only | |
2330 | * includes controllers we can make sense of and that are | |
2331 | * actually accessible. */ | |
2332 | ||
2333 | r = cg_all_unified(); | |
2334 | if (r < 0) | |
2335 | return r; | |
2336 | if (r > 0) { | |
2337 | _cleanup_free_ char *root = NULL, *controllers = NULL, *path = NULL; | |
2338 | ||
2339 | /* In the unified hierarchy we can read the supported | |
2340 | * and accessible controllers from a the top-level | |
2341 | * cgroup attribute */ | |
2342 | ||
2343 | r = cg_get_root_path(&root); | |
2344 | if (r < 0) | |
2345 | return r; | |
2346 | ||
2347 | r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, root, "cgroup.controllers", &path); | |
2348 | if (r < 0) | |
2349 | return r; | |
2350 | ||
2351 | r = read_one_line_file(path, &controllers); | |
2352 | if (r < 0) | |
2353 | return r; | |
2354 | ||
2355 | r = cg_mask_from_string(controllers, &mask); | |
2356 | if (r < 0) | |
2357 | return r; | |
2358 | ||
2359 | /* Currently, we support the cpu, memory, io and pids | |
2360 | * controller in the unified hierarchy, mask | |
2361 | * everything else off. */ | |
2362 | mask &= CGROUP_MASK_CPU | CGROUP_MASK_MEMORY | CGROUP_MASK_IO | CGROUP_MASK_PIDS; | |
2363 | ||
2364 | } else { | |
2365 | CGroupController c; | |
2366 | ||
2367 | /* In the legacy hierarchy, we check whether which | |
2368 | * hierarchies are mounted. */ | |
2369 | ||
2370 | for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) { | |
2371 | const char *n; | |
2372 | ||
2373 | n = cgroup_controller_to_string(c); | |
2374 | if (controller_is_accessible(n) >= 0) | |
2375 | mask |= CGROUP_CONTROLLER_TO_MASK(c); | |
2376 | } | |
2377 | } | |
2378 | ||
2379 | *ret = mask; | |
2380 | return 0; | |
2381 | } | |
2382 | ||
2383 | int cg_kernel_controllers(Set **ret) { | |
2384 | _cleanup_set_free_free_ Set *controllers = NULL; | |
2385 | _cleanup_fclose_ FILE *f = NULL; | |
2386 | int r; | |
2387 | ||
2388 | assert(ret); | |
2389 | ||
2390 | /* Determines the full list of kernel-known controllers. Might | |
2391 | * include controllers we don't actually support, arbitrary | |
2392 | * named hierarchies and controllers that aren't currently | |
2393 | * accessible (because not mounted). */ | |
2394 | ||
2395 | controllers = set_new(&string_hash_ops); | |
2396 | if (!controllers) | |
2397 | return -ENOMEM; | |
2398 | ||
2399 | f = fopen("/proc/cgroups", "re"); | |
2400 | if (!f) { | |
2401 | if (errno == ENOENT) { | |
2402 | *ret = NULL; | |
2403 | return 0; | |
2404 | } | |
2405 | ||
2406 | return -errno; | |
2407 | } | |
2408 | ||
2409 | (void) __fsetlocking(f, FSETLOCKING_BYCALLER); | |
2410 | ||
2411 | /* Ignore the header line */ | |
2412 | (void) read_line(f, (size_t) -1, NULL); | |
2413 | ||
2414 | for (;;) { | |
2415 | char *controller; | |
2416 | int enabled = 0; | |
2417 | ||
2418 | errno = 0; | |
2419 | if (fscanf(f, "%ms %*i %*i %i", &controller, &enabled) != 2) { | |
2420 | ||
2421 | if (feof(f)) | |
2422 | break; | |
2423 | ||
2424 | if (ferror(f) && errno > 0) | |
2425 | return -errno; | |
2426 | ||
2427 | return -EBADMSG; | |
2428 | } | |
2429 | ||
2430 | if (!enabled) { | |
2431 | free(controller); | |
2432 | continue; | |
2433 | } | |
2434 | ||
2435 | if (!cg_controller_is_valid(controller)) { | |
2436 | free(controller); | |
2437 | return -EBADMSG; | |
2438 | } | |
2439 | ||
2440 | r = set_consume(controllers, controller); | |
2441 | if (r < 0) | |
2442 | return r; | |
2443 | } | |
2444 | ||
2445 | *ret = TAKE_PTR(controllers); | |
2446 | ||
2447 | return 0; | |
2448 | } | |
2449 | ||
2450 | static thread_local CGroupUnified unified_cache = CGROUP_UNIFIED_UNKNOWN; | |
2451 | ||
2452 | /* The hybrid mode was initially implemented in v232 and simply mounted cgroup v2 on /sys/fs/cgroup/systemd. This | |
2453 | * unfortunately broke other tools (such as docker) which expected the v1 "name=systemd" hierarchy on | |
2454 | * /sys/fs/cgroup/systemd. From v233 and on, the hybrid mode mountnbs v2 on /sys/fs/cgroup/unified and maintains | |
2455 | * "name=systemd" hierarchy on /sys/fs/cgroup/systemd for compatibility with other tools. | |
2456 | * | |
2457 | * To keep live upgrade working, we detect and support v232 layout. When v232 layout is detected, to keep cgroup v2 | |
2458 | * process management but disable the compat dual layout, we return %true on | |
2459 | * cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER) and %false on cg_hybrid_unified(). | |
2460 | */ | |
2461 | static thread_local bool unified_systemd_v232; | |
2462 | ||
2463 | static int cg_unified_update(void) { | |
2464 | ||
2465 | struct statfs fs; | |
2466 | ||
2467 | /* Checks if we support the unified hierarchy. Returns an | |
2468 | * error when the cgroup hierarchies aren't mounted yet or we | |
2469 | * have any other trouble determining if the unified hierarchy | |
2470 | * is supported. */ | |
2471 | ||
2472 | if (unified_cache >= CGROUP_UNIFIED_NONE) | |
2473 | return 0; | |
2474 | ||
2475 | if (statfs("/sys/fs/cgroup/", &fs) < 0) | |
2476 | return log_debug_errno(errno, "statfs(\"/sys/fs/cgroup/\") failed: %m"); | |
2477 | ||
2478 | if (F_TYPE_EQUAL(fs.f_type, CGROUP2_SUPER_MAGIC)) { | |
2479 | log_debug("Found cgroup2 on /sys/fs/cgroup/, full unified hierarchy"); | |
2480 | unified_cache = CGROUP_UNIFIED_ALL; | |
2481 | } else if (F_TYPE_EQUAL(fs.f_type, TMPFS_MAGIC)) { | |
2482 | if (statfs("/sys/fs/cgroup/unified/", &fs) == 0 && | |
2483 | F_TYPE_EQUAL(fs.f_type, CGROUP2_SUPER_MAGIC)) { | |
2484 | log_debug("Found cgroup2 on /sys/fs/cgroup/unified, unified hierarchy for systemd controller"); | |
2485 | unified_cache = CGROUP_UNIFIED_SYSTEMD; | |
2486 | unified_systemd_v232 = false; | |
2487 | } else { | |
2488 | if (statfs("/sys/fs/cgroup/systemd/", &fs) < 0) | |
2489 | return log_debug_errno(errno, "statfs(\"/sys/fs/cgroup/systemd\" failed: %m"); | |
2490 | ||
2491 | if (F_TYPE_EQUAL(fs.f_type, CGROUP2_SUPER_MAGIC)) { | |
2492 | log_debug("Found cgroup2 on /sys/fs/cgroup/systemd, unified hierarchy for systemd controller (v232 variant)"); | |
2493 | unified_cache = CGROUP_UNIFIED_SYSTEMD; | |
2494 | unified_systemd_v232 = true; | |
2495 | } else if (F_TYPE_EQUAL(fs.f_type, CGROUP_SUPER_MAGIC)) { | |
2496 | log_debug("Found cgroup on /sys/fs/cgroup/systemd, legacy hierarchy"); | |
2497 | unified_cache = CGROUP_UNIFIED_NONE; | |
2498 | } else { | |
2499 | log_debug("Unexpected filesystem type %llx mounted on /sys/fs/cgroup/systemd, assuming legacy hierarchy", | |
2500 | (unsigned long long) fs.f_type); | |
2501 | unified_cache = CGROUP_UNIFIED_NONE; | |
2502 | } | |
2503 | } | |
2504 | } else { | |
2505 | log_debug("Unknown filesystem type %llx mounted on /sys/fs/cgroup.", | |
2506 | (unsigned long long) fs.f_type); | |
2507 | return -ENOMEDIUM; | |
2508 | } | |
2509 | ||
2510 | return 0; | |
2511 | } | |
2512 | ||
2513 | int cg_unified_controller(const char *controller) { | |
2514 | int r; | |
2515 | ||
2516 | r = cg_unified_update(); | |
2517 | if (r < 0) | |
2518 | return r; | |
2519 | ||
2520 | if (unified_cache == CGROUP_UNIFIED_NONE) | |
2521 | return false; | |
2522 | ||
2523 | if (unified_cache >= CGROUP_UNIFIED_ALL) | |
2524 | return true; | |
2525 | ||
2526 | return streq_ptr(controller, SYSTEMD_CGROUP_CONTROLLER); | |
2527 | } | |
2528 | ||
2529 | int cg_all_unified(void) { | |
2530 | int r; | |
2531 | ||
2532 | r = cg_unified_update(); | |
2533 | if (r < 0) | |
2534 | return r; | |
2535 | ||
2536 | return unified_cache >= CGROUP_UNIFIED_ALL; | |
2537 | } | |
2538 | ||
2539 | int cg_hybrid_unified(void) { | |
2540 | int r; | |
2541 | ||
2542 | r = cg_unified_update(); | |
2543 | if (r < 0) | |
2544 | return r; | |
2545 | ||
2546 | return unified_cache == CGROUP_UNIFIED_SYSTEMD && !unified_systemd_v232; | |
2547 | } | |
2548 | ||
2549 | int cg_unified_flush(void) { | |
2550 | unified_cache = CGROUP_UNIFIED_UNKNOWN; | |
2551 | ||
2552 | return cg_unified_update(); | |
2553 | } | |
2554 | ||
2555 | int cg_enable_everywhere(CGroupMask supported, CGroupMask mask, const char *p) { | |
2556 | _cleanup_fclose_ FILE *f = NULL; | |
2557 | _cleanup_free_ char *fs = NULL; | |
2558 | CGroupController c; | |
2559 | int r; | |
2560 | ||
2561 | assert(p); | |
2562 | ||
2563 | if (supported == 0) | |
2564 | return 0; | |
2565 | ||
2566 | r = cg_all_unified(); | |
2567 | if (r < 0) | |
2568 | return r; | |
2569 | if (r == 0) /* on the legacy hiearchy there's no joining of controllers defined */ | |
2570 | return 0; | |
2571 | ||
2572 | r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, p, "cgroup.subtree_control", &fs); | |
2573 | if (r < 0) | |
2574 | return r; | |
2575 | ||
2576 | for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) { | |
2577 | CGroupMask bit = CGROUP_CONTROLLER_TO_MASK(c); | |
2578 | const char *n; | |
2579 | ||
2580 | if (!(supported & bit)) | |
2581 | continue; | |
2582 | ||
2583 | n = cgroup_controller_to_string(c); | |
2584 | { | |
2585 | char s[1 + strlen(n) + 1]; | |
2586 | ||
2587 | s[0] = mask & bit ? '+' : '-'; | |
2588 | strcpy(s + 1, n); | |
2589 | ||
2590 | if (!f) { | |
2591 | f = fopen(fs, "we"); | |
2592 | if (!f) { | |
2593 | log_debug_errno(errno, "Failed to open cgroup.subtree_control file of %s: %m", p); | |
2594 | break; | |
2595 | } | |
2596 | } | |
2597 | ||
2598 | r = write_string_stream(f, s, 0); | |
2599 | if (r < 0) { | |
2600 | log_debug_errno(r, "Failed to enable controller %s for %s (%s): %m", n, p, fs); | |
2601 | clearerr(f); | |
2602 | } | |
2603 | } | |
2604 | } | |
2605 | ||
2606 | return 0; | |
2607 | } | |
2608 | ||
2609 | bool cg_is_unified_wanted(void) { | |
2610 | static thread_local int wanted = -1; | |
2611 | int r; | |
2612 | bool b; | |
2613 | const bool is_default = DEFAULT_HIERARCHY == CGROUP_UNIFIED_ALL; | |
2614 | ||
2615 | /* If we have a cached value, return that. */ | |
2616 | if (wanted >= 0) | |
2617 | return wanted; | |
2618 | ||
2619 | /* If the hierarchy is already mounted, then follow whatever | |
2620 | * was chosen for it. */ | |
2621 | if (cg_unified_flush() >= 0) | |
2622 | return (wanted = unified_cache >= CGROUP_UNIFIED_ALL); | |
2623 | ||
2624 | /* Otherwise, let's see what the kernel command line has to say. | |
2625 | * Since checking is expensive, cache a non-error result. */ | |
2626 | r = proc_cmdline_get_bool("systemd.unified_cgroup_hierarchy", &b); | |
2627 | ||
2628 | return (wanted = r > 0 ? b : is_default); | |
2629 | } | |
2630 | ||
2631 | bool cg_is_legacy_wanted(void) { | |
2632 | static thread_local int wanted = -1; | |
2633 | ||
2634 | /* If we have a cached value, return that. */ | |
2635 | if (wanted >= 0) | |
2636 | return wanted; | |
2637 | ||
2638 | /* Check if we have cgroups2 already mounted. */ | |
2639 | if (cg_unified_flush() >= 0 && | |
2640 | unified_cache == CGROUP_UNIFIED_ALL) | |
2641 | return (wanted = false); | |
2642 | ||
2643 | /* Otherwise, assume that at least partial legacy is wanted, | |
2644 | * since cgroups2 should already be mounted at this point. */ | |
2645 | return (wanted = true); | |
2646 | } | |
2647 | ||
2648 | bool cg_is_hybrid_wanted(void) { | |
2649 | static thread_local int wanted = -1; | |
2650 | int r; | |
2651 | bool b; | |
2652 | const bool is_default = DEFAULT_HIERARCHY >= CGROUP_UNIFIED_SYSTEMD; | |
2653 | /* We default to true if the default is "hybrid", obviously, | |
2654 | * but also when the default is "unified", because if we get | |
2655 | * called, it means that unified hierarchy was not mounted. */ | |
2656 | ||
2657 | /* If we have a cached value, return that. */ | |
2658 | if (wanted >= 0) | |
2659 | return wanted; | |
2660 | ||
2661 | /* If the hierarchy is already mounted, then follow whatever | |
2662 | * was chosen for it. */ | |
2663 | if (cg_unified_flush() >= 0 && | |
2664 | unified_cache == CGROUP_UNIFIED_ALL) | |
2665 | return (wanted = false); | |
2666 | ||
2667 | /* Otherwise, let's see what the kernel command line has to say. | |
2668 | * Since checking is expensive, cache a non-error result. */ | |
2669 | r = proc_cmdline_get_bool("systemd.legacy_systemd_cgroup_controller", &b); | |
2670 | ||
2671 | /* The meaning of the kernel option is reversed wrt. to the return value | |
2672 | * of this function, hence the negation. */ | |
2673 | return (wanted = r > 0 ? !b : is_default); | |
2674 | } | |
2675 | ||
2676 | int cg_weight_parse(const char *s, uint64_t *ret) { | |
2677 | uint64_t u; | |
2678 | int r; | |
2679 | ||
2680 | if (isempty(s)) { | |
2681 | *ret = CGROUP_WEIGHT_INVALID; | |
2682 | return 0; | |
2683 | } | |
2684 | ||
2685 | r = safe_atou64(s, &u); | |
2686 | if (r < 0) | |
2687 | return r; | |
2688 | ||
2689 | if (u < CGROUP_WEIGHT_MIN || u > CGROUP_WEIGHT_MAX) | |
2690 | return -ERANGE; | |
2691 | ||
2692 | *ret = u; | |
2693 | return 0; | |
2694 | } | |
2695 | ||
2696 | const uint64_t cgroup_io_limit_defaults[_CGROUP_IO_LIMIT_TYPE_MAX] = { | |
2697 | [CGROUP_IO_RBPS_MAX] = CGROUP_LIMIT_MAX, | |
2698 | [CGROUP_IO_WBPS_MAX] = CGROUP_LIMIT_MAX, | |
2699 | [CGROUP_IO_RIOPS_MAX] = CGROUP_LIMIT_MAX, | |
2700 | [CGROUP_IO_WIOPS_MAX] = CGROUP_LIMIT_MAX, | |
2701 | }; | |
2702 | ||
2703 | static const char* const cgroup_io_limit_type_table[_CGROUP_IO_LIMIT_TYPE_MAX] = { | |
2704 | [CGROUP_IO_RBPS_MAX] = "IOReadBandwidthMax", | |
2705 | [CGROUP_IO_WBPS_MAX] = "IOWriteBandwidthMax", | |
2706 | [CGROUP_IO_RIOPS_MAX] = "IOReadIOPSMax", | |
2707 | [CGROUP_IO_WIOPS_MAX] = "IOWriteIOPSMax", | |
2708 | }; | |
2709 | ||
2710 | DEFINE_STRING_TABLE_LOOKUP(cgroup_io_limit_type, CGroupIOLimitType); | |
2711 | ||
2712 | int cg_cpu_shares_parse(const char *s, uint64_t *ret) { | |
2713 | uint64_t u; | |
2714 | int r; | |
2715 | ||
2716 | if (isempty(s)) { | |
2717 | *ret = CGROUP_CPU_SHARES_INVALID; | |
2718 | return 0; | |
2719 | } | |
2720 | ||
2721 | r = safe_atou64(s, &u); | |
2722 | if (r < 0) | |
2723 | return r; | |
2724 | ||
2725 | if (u < CGROUP_CPU_SHARES_MIN || u > CGROUP_CPU_SHARES_MAX) | |
2726 | return -ERANGE; | |
2727 | ||
2728 | *ret = u; | |
2729 | return 0; | |
2730 | } | |
2731 | ||
2732 | int cg_blkio_weight_parse(const char *s, uint64_t *ret) { | |
2733 | uint64_t u; | |
2734 | int r; | |
2735 | ||
2736 | if (isempty(s)) { | |
2737 | *ret = CGROUP_BLKIO_WEIGHT_INVALID; | |
2738 | return 0; | |
2739 | } | |
2740 | ||
2741 | r = safe_atou64(s, &u); | |
2742 | if (r < 0) | |
2743 | return r; | |
2744 | ||
2745 | if (u < CGROUP_BLKIO_WEIGHT_MIN || u > CGROUP_BLKIO_WEIGHT_MAX) | |
2746 | return -ERANGE; | |
2747 | ||
2748 | *ret = u; | |
2749 | return 0; | |
2750 | } | |
2751 | ||
2752 | bool is_cgroup_fs(const struct statfs *s) { | |
2753 | return is_fs_type(s, CGROUP_SUPER_MAGIC) || | |
2754 | is_fs_type(s, CGROUP2_SUPER_MAGIC); | |
2755 | } | |
2756 | ||
2757 | bool fd_is_cgroup_fs(int fd) { | |
2758 | struct statfs s; | |
2759 | ||
2760 | if (fstatfs(fd, &s) < 0) | |
2761 | return -errno; | |
2762 | ||
2763 | return is_cgroup_fs(&s); | |
2764 | } | |
2765 | ||
2766 | static const char *cgroup_controller_table[_CGROUP_CONTROLLER_MAX] = { | |
2767 | [CGROUP_CONTROLLER_CPU] = "cpu", | |
2768 | [CGROUP_CONTROLLER_CPUACCT] = "cpuacct", | |
2769 | [CGROUP_CONTROLLER_IO] = "io", | |
2770 | [CGROUP_CONTROLLER_BLKIO] = "blkio", | |
2771 | [CGROUP_CONTROLLER_MEMORY] = "memory", | |
2772 | [CGROUP_CONTROLLER_DEVICES] = "devices", | |
2773 | [CGROUP_CONTROLLER_PIDS] = "pids", | |
2774 | }; | |
2775 | ||
2776 | DEFINE_STRING_TABLE_LOOKUP(cgroup_controller, CGroupController); |