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1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ | |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2013 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
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 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <fcntl.h> | |
23 | #include <fnmatch.h> | |
24 | ||
25 | #include "cgroup-util.h" | |
26 | #include "path-util.h" | |
27 | #include "process-util.h" | |
28 | #include "special.h" | |
29 | #include "string-util.h" | |
30 | #include "cgroup.h" | |
31 | ||
32 | #define CGROUP_CPU_QUOTA_PERIOD_USEC ((usec_t) 100 * USEC_PER_MSEC) | |
33 | ||
34 | void cgroup_context_init(CGroupContext *c) { | |
35 | assert(c); | |
36 | ||
37 | /* Initialize everything to the kernel defaults, assuming the | |
38 | * structure is preinitialized to 0 */ | |
39 | ||
40 | c->cpu_shares = CGROUP_CPU_SHARES_INVALID; | |
41 | c->startup_cpu_shares = CGROUP_CPU_SHARES_INVALID; | |
42 | c->cpu_quota_per_sec_usec = USEC_INFINITY; | |
43 | ||
44 | c->memory_limit = (uint64_t) -1; | |
45 | ||
46 | c->blockio_weight = CGROUP_BLKIO_WEIGHT_INVALID; | |
47 | c->startup_blockio_weight = CGROUP_BLKIO_WEIGHT_INVALID; | |
48 | ||
49 | c->tasks_max = (uint64_t) -1; | |
50 | ||
51 | c->netclass_type = CGROUP_NETCLASS_TYPE_NONE; | |
52 | } | |
53 | ||
54 | void cgroup_context_free_device_allow(CGroupContext *c, CGroupDeviceAllow *a) { | |
55 | assert(c); | |
56 | assert(a); | |
57 | ||
58 | LIST_REMOVE(device_allow, c->device_allow, a); | |
59 | free(a->path); | |
60 | free(a); | |
61 | } | |
62 | ||
63 | void cgroup_context_free_blockio_device_weight(CGroupContext *c, CGroupBlockIODeviceWeight *w) { | |
64 | assert(c); | |
65 | assert(w); | |
66 | ||
67 | LIST_REMOVE(device_weights, c->blockio_device_weights, w); | |
68 | free(w->path); | |
69 | free(w); | |
70 | } | |
71 | ||
72 | void cgroup_context_free_blockio_device_bandwidth(CGroupContext *c, CGroupBlockIODeviceBandwidth *b) { | |
73 | assert(c); | |
74 | assert(b); | |
75 | ||
76 | LIST_REMOVE(device_bandwidths, c->blockio_device_bandwidths, b); | |
77 | free(b->path); | |
78 | free(b); | |
79 | } | |
80 | ||
81 | void cgroup_context_done(CGroupContext *c) { | |
82 | assert(c); | |
83 | ||
84 | while (c->blockio_device_weights) | |
85 | cgroup_context_free_blockio_device_weight(c, c->blockio_device_weights); | |
86 | ||
87 | while (c->blockio_device_bandwidths) | |
88 | cgroup_context_free_blockio_device_bandwidth(c, c->blockio_device_bandwidths); | |
89 | ||
90 | while (c->device_allow) | |
91 | cgroup_context_free_device_allow(c, c->device_allow); | |
92 | } | |
93 | ||
94 | void cgroup_context_dump(CGroupContext *c, FILE* f, const char *prefix) { | |
95 | CGroupBlockIODeviceBandwidth *b; | |
96 | CGroupBlockIODeviceWeight *w; | |
97 | CGroupDeviceAllow *a; | |
98 | char u[FORMAT_TIMESPAN_MAX]; | |
99 | ||
100 | assert(c); | |
101 | assert(f); | |
102 | ||
103 | prefix = strempty(prefix); | |
104 | ||
105 | fprintf(f, | |
106 | "%sCPUAccounting=%s\n" | |
107 | "%sBlockIOAccounting=%s\n" | |
108 | "%sMemoryAccounting=%s\n" | |
109 | "%sTasksAccounting=%s\n" | |
110 | "%sCPUShares=%" PRIu64 "\n" | |
111 | "%sStartupCPUShares=%" PRIu64 "\n" | |
112 | "%sCPUQuotaPerSecSec=%s\n" | |
113 | "%sBlockIOWeight=%" PRIu64 "\n" | |
114 | "%sStartupBlockIOWeight=%" PRIu64 "\n" | |
115 | "%sMemoryLimit=%" PRIu64 "\n" | |
116 | "%sTasksMax=%" PRIu64 "\n" | |
117 | "%sDevicePolicy=%s\n" | |
118 | "%sDelegate=%s\n", | |
119 | prefix, yes_no(c->cpu_accounting), | |
120 | prefix, yes_no(c->blockio_accounting), | |
121 | prefix, yes_no(c->memory_accounting), | |
122 | prefix, yes_no(c->tasks_accounting), | |
123 | prefix, c->cpu_shares, | |
124 | prefix, c->startup_cpu_shares, | |
125 | prefix, format_timespan(u, sizeof(u), c->cpu_quota_per_sec_usec, 1), | |
126 | prefix, c->blockio_weight, | |
127 | prefix, c->startup_blockio_weight, | |
128 | prefix, c->memory_limit, | |
129 | prefix, c->tasks_max, | |
130 | prefix, cgroup_device_policy_to_string(c->device_policy), | |
131 | prefix, yes_no(c->delegate)); | |
132 | ||
133 | LIST_FOREACH(device_allow, a, c->device_allow) | |
134 | fprintf(f, | |
135 | "%sDeviceAllow=%s %s%s%s\n", | |
136 | prefix, | |
137 | a->path, | |
138 | a->r ? "r" : "", a->w ? "w" : "", a->m ? "m" : ""); | |
139 | ||
140 | LIST_FOREACH(device_weights, w, c->blockio_device_weights) | |
141 | fprintf(f, | |
142 | "%sBlockIODeviceWeight=%s %" PRIu64, | |
143 | prefix, | |
144 | w->path, | |
145 | w->weight); | |
146 | ||
147 | LIST_FOREACH(device_bandwidths, b, c->blockio_device_bandwidths) { | |
148 | char buf[FORMAT_BYTES_MAX]; | |
149 | ||
150 | fprintf(f, | |
151 | "%s%s=%s %s\n", | |
152 | prefix, | |
153 | b->read ? "BlockIOReadBandwidth" : "BlockIOWriteBandwidth", | |
154 | b->path, | |
155 | format_bytes(buf, sizeof(buf), b->bandwidth)); | |
156 | } | |
157 | } | |
158 | ||
159 | static int lookup_blkio_device(const char *p, dev_t *dev) { | |
160 | struct stat st; | |
161 | int r; | |
162 | ||
163 | assert(p); | |
164 | assert(dev); | |
165 | ||
166 | r = stat(p, &st); | |
167 | if (r < 0) | |
168 | return log_warning_errno(errno, "Couldn't stat device %s: %m", p); | |
169 | ||
170 | if (S_ISBLK(st.st_mode)) | |
171 | *dev = st.st_rdev; | |
172 | else if (major(st.st_dev) != 0) { | |
173 | /* If this is not a device node then find the block | |
174 | * device this file is stored on */ | |
175 | *dev = st.st_dev; | |
176 | ||
177 | /* If this is a partition, try to get the originating | |
178 | * block device */ | |
179 | block_get_whole_disk(*dev, dev); | |
180 | } else { | |
181 | log_warning("%s is not a block device and file system block device cannot be determined or is not local.", p); | |
182 | return -ENODEV; | |
183 | } | |
184 | ||
185 | return 0; | |
186 | } | |
187 | ||
188 | static int whitelist_device(const char *path, const char *node, const char *acc) { | |
189 | char buf[2+DECIMAL_STR_MAX(dev_t)*2+2+4]; | |
190 | struct stat st; | |
191 | int r; | |
192 | ||
193 | assert(path); | |
194 | assert(acc); | |
195 | ||
196 | if (stat(node, &st) < 0) { | |
197 | log_warning("Couldn't stat device %s", node); | |
198 | return -errno; | |
199 | } | |
200 | ||
201 | if (!S_ISCHR(st.st_mode) && !S_ISBLK(st.st_mode)) { | |
202 | log_warning("%s is not a device.", node); | |
203 | return -ENODEV; | |
204 | } | |
205 | ||
206 | sprintf(buf, | |
207 | "%c %u:%u %s", | |
208 | S_ISCHR(st.st_mode) ? 'c' : 'b', | |
209 | major(st.st_rdev), minor(st.st_rdev), | |
210 | acc); | |
211 | ||
212 | r = cg_set_attribute("devices", path, "devices.allow", buf); | |
213 | if (r < 0) | |
214 | log_full_errno(IN_SET(r, -ENOENT, -EROFS, -EINVAL) ? LOG_DEBUG : LOG_WARNING, r, | |
215 | "Failed to set devices.allow on %s: %m", path); | |
216 | ||
217 | return r; | |
218 | } | |
219 | ||
220 | static int whitelist_major(const char *path, const char *name, char type, const char *acc) { | |
221 | _cleanup_fclose_ FILE *f = NULL; | |
222 | char line[LINE_MAX]; | |
223 | bool good = false; | |
224 | int r; | |
225 | ||
226 | assert(path); | |
227 | assert(acc); | |
228 | assert(type == 'b' || type == 'c'); | |
229 | ||
230 | f = fopen("/proc/devices", "re"); | |
231 | if (!f) | |
232 | return log_warning_errno(errno, "Cannot open /proc/devices to resolve %s (%c): %m", name, type); | |
233 | ||
234 | FOREACH_LINE(line, f, goto fail) { | |
235 | char buf[2+DECIMAL_STR_MAX(unsigned)+3+4], *p, *w; | |
236 | unsigned maj; | |
237 | ||
238 | truncate_nl(line); | |
239 | ||
240 | if (type == 'c' && streq(line, "Character devices:")) { | |
241 | good = true; | |
242 | continue; | |
243 | } | |
244 | ||
245 | if (type == 'b' && streq(line, "Block devices:")) { | |
246 | good = true; | |
247 | continue; | |
248 | } | |
249 | ||
250 | if (isempty(line)) { | |
251 | good = false; | |
252 | continue; | |
253 | } | |
254 | ||
255 | if (!good) | |
256 | continue; | |
257 | ||
258 | p = strstrip(line); | |
259 | ||
260 | w = strpbrk(p, WHITESPACE); | |
261 | if (!w) | |
262 | continue; | |
263 | *w = 0; | |
264 | ||
265 | r = safe_atou(p, &maj); | |
266 | if (r < 0) | |
267 | continue; | |
268 | if (maj <= 0) | |
269 | continue; | |
270 | ||
271 | w++; | |
272 | w += strspn(w, WHITESPACE); | |
273 | ||
274 | if (fnmatch(name, w, 0) != 0) | |
275 | continue; | |
276 | ||
277 | sprintf(buf, | |
278 | "%c %u:* %s", | |
279 | type, | |
280 | maj, | |
281 | acc); | |
282 | ||
283 | r = cg_set_attribute("devices", path, "devices.allow", buf); | |
284 | if (r < 0) | |
285 | log_full_errno(IN_SET(r, -ENOENT, -EROFS, -EINVAL) ? LOG_DEBUG : LOG_WARNING, r, | |
286 | "Failed to set devices.allow on %s: %m", path); | |
287 | } | |
288 | ||
289 | return 0; | |
290 | ||
291 | fail: | |
292 | log_warning_errno(errno, "Failed to read /proc/devices: %m"); | |
293 | return -errno; | |
294 | } | |
295 | ||
296 | void cgroup_context_apply(CGroupContext *c, CGroupMask mask, const char *path, uint32_t netclass, ManagerState state) { | |
297 | bool is_root; | |
298 | int r; | |
299 | ||
300 | assert(c); | |
301 | assert(path); | |
302 | ||
303 | if (mask == 0) | |
304 | return; | |
305 | ||
306 | /* Some cgroup attributes are not supported on the root cgroup, | |
307 | * hence silently ignore */ | |
308 | is_root = isempty(path) || path_equal(path, "/"); | |
309 | if (is_root) | |
310 | /* Make sure we don't try to display messages with an empty path. */ | |
311 | path = "/"; | |
312 | ||
313 | /* We generally ignore errors caused by read-only mounted | |
314 | * cgroup trees (assuming we are running in a container then), | |
315 | * and missing cgroups, i.e. EROFS and ENOENT. */ | |
316 | ||
317 | if ((mask & CGROUP_MASK_CPU) && !is_root) { | |
318 | char buf[MAX(DECIMAL_STR_MAX(uint64_t), DECIMAL_STR_MAX(usec_t)) + 1]; | |
319 | ||
320 | sprintf(buf, "%" PRIu64 "\n", | |
321 | IN_SET(state, MANAGER_STARTING, MANAGER_INITIALIZING) && c->startup_cpu_shares != CGROUP_CPU_SHARES_INVALID ? c->startup_cpu_shares : | |
322 | c->cpu_shares != CGROUP_CPU_SHARES_INVALID ? c->cpu_shares : CGROUP_CPU_SHARES_DEFAULT); | |
323 | r = cg_set_attribute("cpu", path, "cpu.shares", buf); | |
324 | if (r < 0) | |
325 | log_full_errno(IN_SET(r, -ENOENT, -EROFS) ? LOG_DEBUG : LOG_WARNING, r, | |
326 | "Failed to set cpu.shares on %s: %m", path); | |
327 | ||
328 | sprintf(buf, USEC_FMT "\n", CGROUP_CPU_QUOTA_PERIOD_USEC); | |
329 | r = cg_set_attribute("cpu", path, "cpu.cfs_period_us", buf); | |
330 | if (r < 0) | |
331 | log_full_errno(IN_SET(r, -ENOENT, -EROFS) ? LOG_DEBUG : LOG_WARNING, r, | |
332 | "Failed to set cpu.cfs_period_us on %s: %m", path); | |
333 | ||
334 | if (c->cpu_quota_per_sec_usec != USEC_INFINITY) { | |
335 | sprintf(buf, USEC_FMT "\n", c->cpu_quota_per_sec_usec * CGROUP_CPU_QUOTA_PERIOD_USEC / USEC_PER_SEC); | |
336 | r = cg_set_attribute("cpu", path, "cpu.cfs_quota_us", buf); | |
337 | } else | |
338 | r = cg_set_attribute("cpu", path, "cpu.cfs_quota_us", "-1"); | |
339 | if (r < 0) | |
340 | log_full_errno(IN_SET(r, -ENOENT, -EROFS) ? LOG_DEBUG : LOG_WARNING, r, | |
341 | "Failed to set cpu.cfs_quota_us on %s: %m", path); | |
342 | } | |
343 | ||
344 | if (mask & CGROUP_MASK_BLKIO) { | |
345 | char buf[MAX(DECIMAL_STR_MAX(uint64_t)+1, | |
346 | DECIMAL_STR_MAX(dev_t)*2+2+DECIMAL_STR_MAX(uint64_t)+1)]; | |
347 | CGroupBlockIODeviceWeight *w; | |
348 | CGroupBlockIODeviceBandwidth *b; | |
349 | ||
350 | if (!is_root) { | |
351 | sprintf(buf, "%" PRIu64 "\n", | |
352 | IN_SET(state, MANAGER_STARTING, MANAGER_INITIALIZING) && c->startup_blockio_weight != CGROUP_BLKIO_WEIGHT_INVALID ? c->startup_blockio_weight : | |
353 | c->blockio_weight != CGROUP_BLKIO_WEIGHT_INVALID ? c->blockio_weight : CGROUP_BLKIO_WEIGHT_DEFAULT); | |
354 | r = cg_set_attribute("blkio", path, "blkio.weight", buf); | |
355 | if (r < 0) | |
356 | log_full_errno(IN_SET(r, -ENOENT, -EROFS) ? LOG_DEBUG : LOG_WARNING, r, | |
357 | "Failed to set blkio.weight on %s: %m", path); | |
358 | ||
359 | /* FIXME: no way to reset this list */ | |
360 | LIST_FOREACH(device_weights, w, c->blockio_device_weights) { | |
361 | dev_t dev; | |
362 | ||
363 | r = lookup_blkio_device(w->path, &dev); | |
364 | if (r < 0) | |
365 | continue; | |
366 | ||
367 | sprintf(buf, "%u:%u %" PRIu64 "\n", major(dev), minor(dev), w->weight); | |
368 | r = cg_set_attribute("blkio", path, "blkio.weight_device", buf); | |
369 | if (r < 0) | |
370 | log_full_errno(IN_SET(r, -ENOENT, -EROFS) ? LOG_DEBUG : LOG_WARNING, r, | |
371 | "Failed to set blkio.weight_device on %s: %m", path); | |
372 | } | |
373 | } | |
374 | ||
375 | /* FIXME: no way to reset this list */ | |
376 | LIST_FOREACH(device_bandwidths, b, c->blockio_device_bandwidths) { | |
377 | const char *a; | |
378 | dev_t dev; | |
379 | ||
380 | r = lookup_blkio_device(b->path, &dev); | |
381 | if (r < 0) | |
382 | continue; | |
383 | ||
384 | a = b->read ? "blkio.throttle.read_bps_device" : "blkio.throttle.write_bps_device"; | |
385 | ||
386 | sprintf(buf, "%u:%u %" PRIu64 "\n", major(dev), minor(dev), b->bandwidth); | |
387 | r = cg_set_attribute("blkio", path, a, buf); | |
388 | if (r < 0) | |
389 | log_full_errno(IN_SET(r, -ENOENT, -EROFS) ? LOG_DEBUG : LOG_WARNING, r, | |
390 | "Failed to set %s on %s: %m", a, path); | |
391 | } | |
392 | } | |
393 | ||
394 | if ((mask & CGROUP_MASK_MEMORY) && !is_root) { | |
395 | if (c->memory_limit != (uint64_t) -1) { | |
396 | char buf[DECIMAL_STR_MAX(uint64_t) + 1]; | |
397 | ||
398 | sprintf(buf, "%" PRIu64 "\n", c->memory_limit); | |
399 | ||
400 | if (cg_unified() <= 0) | |
401 | r = cg_set_attribute("memory", path, "memory.limit_in_bytes", buf); | |
402 | else | |
403 | r = cg_set_attribute("memory", path, "memory.max", buf); | |
404 | ||
405 | } else { | |
406 | if (cg_unified() <= 0) | |
407 | r = cg_set_attribute("memory", path, "memory.limit_in_bytes", "-1"); | |
408 | else | |
409 | r = cg_set_attribute("memory", path, "memory.max", "max"); | |
410 | } | |
411 | ||
412 | if (r < 0) | |
413 | log_full_errno(IN_SET(r, -ENOENT, -EROFS) ? LOG_DEBUG : LOG_WARNING, r, | |
414 | "Failed to set memory.limit_in_bytes/memory.max on %s: %m", path); | |
415 | } | |
416 | ||
417 | if ((mask & CGROUP_MASK_DEVICES) && !is_root) { | |
418 | CGroupDeviceAllow *a; | |
419 | ||
420 | /* Changing the devices list of a populated cgroup | |
421 | * might result in EINVAL, hence ignore EINVAL | |
422 | * here. */ | |
423 | ||
424 | if (c->device_allow || c->device_policy != CGROUP_AUTO) | |
425 | r = cg_set_attribute("devices", path, "devices.deny", "a"); | |
426 | else | |
427 | r = cg_set_attribute("devices", path, "devices.allow", "a"); | |
428 | if (r < 0) | |
429 | log_full_errno(IN_SET(r, -ENOENT, -EROFS, -EINVAL) ? LOG_DEBUG : LOG_WARNING, r, | |
430 | "Failed to reset devices.list on %s: %m", path); | |
431 | ||
432 | if (c->device_policy == CGROUP_CLOSED || | |
433 | (c->device_policy == CGROUP_AUTO && c->device_allow)) { | |
434 | static const char auto_devices[] = | |
435 | "/dev/null\0" "rwm\0" | |
436 | "/dev/zero\0" "rwm\0" | |
437 | "/dev/full\0" "rwm\0" | |
438 | "/dev/random\0" "rwm\0" | |
439 | "/dev/urandom\0" "rwm\0" | |
440 | "/dev/tty\0" "rwm\0" | |
441 | "/dev/pts/ptmx\0" "rw\0"; /* /dev/pts/ptmx may not be duplicated, but accessed */ | |
442 | ||
443 | const char *x, *y; | |
444 | ||
445 | NULSTR_FOREACH_PAIR(x, y, auto_devices) | |
446 | whitelist_device(path, x, y); | |
447 | ||
448 | whitelist_major(path, "pts", 'c', "rw"); | |
449 | whitelist_major(path, "kdbus", 'c', "rw"); | |
450 | whitelist_major(path, "kdbus/*", 'c', "rw"); | |
451 | } | |
452 | ||
453 | LIST_FOREACH(device_allow, a, c->device_allow) { | |
454 | char acc[4]; | |
455 | unsigned k = 0; | |
456 | ||
457 | if (a->r) | |
458 | acc[k++] = 'r'; | |
459 | if (a->w) | |
460 | acc[k++] = 'w'; | |
461 | if (a->m) | |
462 | acc[k++] = 'm'; | |
463 | ||
464 | if (k == 0) | |
465 | continue; | |
466 | ||
467 | acc[k++] = 0; | |
468 | ||
469 | if (startswith(a->path, "/dev/")) | |
470 | whitelist_device(path, a->path, acc); | |
471 | else if (startswith(a->path, "block-")) | |
472 | whitelist_major(path, a->path + 6, 'b', acc); | |
473 | else if (startswith(a->path, "char-")) | |
474 | whitelist_major(path, a->path + 5, 'c', acc); | |
475 | else | |
476 | log_debug("Ignoring device %s while writing cgroup attribute.", a->path); | |
477 | } | |
478 | } | |
479 | ||
480 | if ((mask & CGROUP_MASK_PIDS) && !is_root) { | |
481 | ||
482 | if (c->tasks_max != (uint64_t) -1) { | |
483 | char buf[DECIMAL_STR_MAX(uint64_t) + 2]; | |
484 | ||
485 | sprintf(buf, "%" PRIu64 "\n", c->tasks_max); | |
486 | r = cg_set_attribute("pids", path, "pids.max", buf); | |
487 | } else | |
488 | r = cg_set_attribute("pids", path, "pids.max", "max"); | |
489 | ||
490 | if (r < 0) | |
491 | log_full_errno(IN_SET(r, -ENOENT, -EROFS) ? LOG_DEBUG : LOG_WARNING, r, | |
492 | "Failed to set pids.max on %s: %m", path); | |
493 | } | |
494 | ||
495 | if (mask & CGROUP_MASK_NET_CLS) { | |
496 | char buf[DECIMAL_STR_MAX(uint32_t)]; | |
497 | ||
498 | sprintf(buf, "%" PRIu32, netclass); | |
499 | ||
500 | r = cg_set_attribute("net_cls", path, "net_cls.classid", buf); | |
501 | if (r < 0) | |
502 | log_full_errno(IN_SET(r, -ENOENT, -EROFS) ? LOG_DEBUG : LOG_WARNING, r, | |
503 | "Failed to set net_cls.classid on %s: %m", path); | |
504 | } | |
505 | } | |
506 | ||
507 | CGroupMask cgroup_context_get_mask(CGroupContext *c) { | |
508 | CGroupMask mask = 0; | |
509 | ||
510 | /* Figure out which controllers we need */ | |
511 | ||
512 | if (c->cpu_accounting || | |
513 | c->cpu_shares != CGROUP_CPU_SHARES_INVALID || | |
514 | c->startup_cpu_shares != CGROUP_CPU_SHARES_INVALID || | |
515 | c->cpu_quota_per_sec_usec != USEC_INFINITY) | |
516 | mask |= CGROUP_MASK_CPUACCT | CGROUP_MASK_CPU; | |
517 | ||
518 | if (c->blockio_accounting || | |
519 | c->blockio_weight != CGROUP_BLKIO_WEIGHT_INVALID || | |
520 | c->startup_blockio_weight != CGROUP_BLKIO_WEIGHT_INVALID || | |
521 | c->blockio_device_weights || | |
522 | c->blockio_device_bandwidths) | |
523 | mask |= CGROUP_MASK_BLKIO; | |
524 | ||
525 | if (c->memory_accounting || | |
526 | c->memory_limit != (uint64_t) -1) | |
527 | mask |= CGROUP_MASK_MEMORY; | |
528 | ||
529 | if (c->device_allow || | |
530 | c->device_policy != CGROUP_AUTO) | |
531 | mask |= CGROUP_MASK_DEVICES; | |
532 | ||
533 | if (c->tasks_accounting || | |
534 | c->tasks_max != (uint64_t) -1) | |
535 | mask |= CGROUP_MASK_PIDS; | |
536 | ||
537 | if (c->netclass_type != CGROUP_NETCLASS_TYPE_NONE) | |
538 | mask |= CGROUP_MASK_NET_CLS; | |
539 | ||
540 | return mask; | |
541 | } | |
542 | ||
543 | CGroupMask unit_get_own_mask(Unit *u) { | |
544 | CGroupContext *c; | |
545 | ||
546 | /* Returns the mask of controllers the unit needs for itself */ | |
547 | ||
548 | c = unit_get_cgroup_context(u); | |
549 | if (!c) | |
550 | return 0; | |
551 | ||
552 | /* If delegation is turned on, then turn on all cgroups, | |
553 | * unless we are on the legacy hierarchy and the process we | |
554 | * fork into it is known to drop privileges, and hence | |
555 | * shouldn't get access to the controllers. | |
556 | * | |
557 | * Note that on the unified hierarchy it is safe to delegate | |
558 | * controllers to unprivileged services. */ | |
559 | ||
560 | if (c->delegate) { | |
561 | ExecContext *e; | |
562 | ||
563 | e = unit_get_exec_context(u); | |
564 | if (!e || | |
565 | exec_context_maintains_privileges(e) || | |
566 | cg_unified() > 0) | |
567 | return _CGROUP_MASK_ALL; | |
568 | } | |
569 | ||
570 | return cgroup_context_get_mask(c); | |
571 | } | |
572 | ||
573 | CGroupMask unit_get_members_mask(Unit *u) { | |
574 | assert(u); | |
575 | ||
576 | /* Returns the mask of controllers all of the unit's children | |
577 | * require, merged */ | |
578 | ||
579 | if (u->cgroup_members_mask_valid) | |
580 | return u->cgroup_members_mask; | |
581 | ||
582 | u->cgroup_members_mask = 0; | |
583 | ||
584 | if (u->type == UNIT_SLICE) { | |
585 | Unit *member; | |
586 | Iterator i; | |
587 | ||
588 | SET_FOREACH(member, u->dependencies[UNIT_BEFORE], i) { | |
589 | ||
590 | if (member == u) | |
591 | continue; | |
592 | ||
593 | if (UNIT_DEREF(member->slice) != u) | |
594 | continue; | |
595 | ||
596 | u->cgroup_members_mask |= | |
597 | unit_get_own_mask(member) | | |
598 | unit_get_members_mask(member); | |
599 | } | |
600 | } | |
601 | ||
602 | u->cgroup_members_mask_valid = true; | |
603 | return u->cgroup_members_mask; | |
604 | } | |
605 | ||
606 | CGroupMask unit_get_siblings_mask(Unit *u) { | |
607 | assert(u); | |
608 | ||
609 | /* Returns the mask of controllers all of the unit's siblings | |
610 | * require, i.e. the members mask of the unit's parent slice | |
611 | * if there is one. */ | |
612 | ||
613 | if (UNIT_ISSET(u->slice)) | |
614 | return unit_get_members_mask(UNIT_DEREF(u->slice)); | |
615 | ||
616 | return unit_get_own_mask(u) | unit_get_members_mask(u); | |
617 | } | |
618 | ||
619 | CGroupMask unit_get_subtree_mask(Unit *u) { | |
620 | ||
621 | /* Returns the mask of this subtree, meaning of the group | |
622 | * itself and its children. */ | |
623 | ||
624 | return unit_get_own_mask(u) | unit_get_members_mask(u); | |
625 | } | |
626 | ||
627 | CGroupMask unit_get_target_mask(Unit *u) { | |
628 | CGroupMask mask; | |
629 | ||
630 | /* This returns the cgroup mask of all controllers to enable | |
631 | * for a specific cgroup, i.e. everything it needs itself, | |
632 | * plus all that its children need, plus all that its siblings | |
633 | * need. This is primarily useful on the legacy cgroup | |
634 | * hierarchy, where we need to duplicate each cgroup in each | |
635 | * hierarchy that shall be enabled for it. */ | |
636 | ||
637 | mask = unit_get_own_mask(u) | unit_get_members_mask(u) | unit_get_siblings_mask(u); | |
638 | mask &= u->manager->cgroup_supported; | |
639 | ||
640 | return mask; | |
641 | } | |
642 | ||
643 | CGroupMask unit_get_enable_mask(Unit *u) { | |
644 | CGroupMask mask; | |
645 | ||
646 | /* This returns the cgroup mask of all controllers to enable | |
647 | * for the children of a specific cgroup. This is primarily | |
648 | * useful for the unified cgroup hierarchy, where each cgroup | |
649 | * controls which controllers are enabled for its children. */ | |
650 | ||
651 | mask = unit_get_members_mask(u); | |
652 | mask &= u->manager->cgroup_supported; | |
653 | ||
654 | return mask; | |
655 | } | |
656 | ||
657 | /* Recurse from a unit up through its containing slices, propagating | |
658 | * mask bits upward. A unit is also member of itself. */ | |
659 | void unit_update_cgroup_members_masks(Unit *u) { | |
660 | CGroupMask m; | |
661 | bool more; | |
662 | ||
663 | assert(u); | |
664 | ||
665 | /* Calculate subtree mask */ | |
666 | m = unit_get_subtree_mask(u); | |
667 | ||
668 | /* See if anything changed from the previous invocation. If | |
669 | * not, we're done. */ | |
670 | if (u->cgroup_subtree_mask_valid && m == u->cgroup_subtree_mask) | |
671 | return; | |
672 | ||
673 | more = | |
674 | u->cgroup_subtree_mask_valid && | |
675 | ((m & ~u->cgroup_subtree_mask) != 0) && | |
676 | ((~m & u->cgroup_subtree_mask) == 0); | |
677 | ||
678 | u->cgroup_subtree_mask = m; | |
679 | u->cgroup_subtree_mask_valid = true; | |
680 | ||
681 | if (UNIT_ISSET(u->slice)) { | |
682 | Unit *s = UNIT_DEREF(u->slice); | |
683 | ||
684 | if (more) | |
685 | /* There's more set now than before. We | |
686 | * propagate the new mask to the parent's mask | |
687 | * (not caring if it actually was valid or | |
688 | * not). */ | |
689 | ||
690 | s->cgroup_members_mask |= m; | |
691 | ||
692 | else | |
693 | /* There's less set now than before (or we | |
694 | * don't know), we need to recalculate | |
695 | * everything, so let's invalidate the | |
696 | * parent's members mask */ | |
697 | ||
698 | s->cgroup_members_mask_valid = false; | |
699 | ||
700 | /* And now make sure that this change also hits our | |
701 | * grandparents */ | |
702 | unit_update_cgroup_members_masks(s); | |
703 | } | |
704 | } | |
705 | ||
706 | static const char *migrate_callback(CGroupMask mask, void *userdata) { | |
707 | Unit *u = userdata; | |
708 | ||
709 | assert(mask != 0); | |
710 | assert(u); | |
711 | ||
712 | while (u) { | |
713 | if (u->cgroup_path && | |
714 | u->cgroup_realized && | |
715 | (u->cgroup_realized_mask & mask) == mask) | |
716 | return u->cgroup_path; | |
717 | ||
718 | u = UNIT_DEREF(u->slice); | |
719 | } | |
720 | ||
721 | return NULL; | |
722 | } | |
723 | ||
724 | char *unit_default_cgroup_path(Unit *u) { | |
725 | _cleanup_free_ char *escaped = NULL, *slice = NULL; | |
726 | int r; | |
727 | ||
728 | assert(u); | |
729 | ||
730 | if (unit_has_name(u, SPECIAL_ROOT_SLICE)) | |
731 | return strdup(u->manager->cgroup_root); | |
732 | ||
733 | if (UNIT_ISSET(u->slice) && !unit_has_name(UNIT_DEREF(u->slice), SPECIAL_ROOT_SLICE)) { | |
734 | r = cg_slice_to_path(UNIT_DEREF(u->slice)->id, &slice); | |
735 | if (r < 0) | |
736 | return NULL; | |
737 | } | |
738 | ||
739 | escaped = cg_escape(u->id); | |
740 | if (!escaped) | |
741 | return NULL; | |
742 | ||
743 | if (slice) | |
744 | return strjoin(u->manager->cgroup_root, "/", slice, "/", escaped, NULL); | |
745 | else | |
746 | return strjoin(u->manager->cgroup_root, "/", escaped, NULL); | |
747 | } | |
748 | ||
749 | int unit_set_cgroup_path(Unit *u, const char *path) { | |
750 | _cleanup_free_ char *p = NULL; | |
751 | int r; | |
752 | ||
753 | assert(u); | |
754 | ||
755 | if (path) { | |
756 | p = strdup(path); | |
757 | if (!p) | |
758 | return -ENOMEM; | |
759 | } else | |
760 | p = NULL; | |
761 | ||
762 | if (streq_ptr(u->cgroup_path, p)) | |
763 | return 0; | |
764 | ||
765 | if (p) { | |
766 | r = hashmap_put(u->manager->cgroup_unit, p, u); | |
767 | if (r < 0) | |
768 | return r; | |
769 | } | |
770 | ||
771 | unit_release_cgroup(u); | |
772 | ||
773 | u->cgroup_path = p; | |
774 | p = NULL; | |
775 | ||
776 | return 1; | |
777 | } | |
778 | ||
779 | int unit_watch_cgroup(Unit *u) { | |
780 | _cleanup_free_ char *populated = NULL; | |
781 | int r; | |
782 | ||
783 | assert(u); | |
784 | ||
785 | if (!u->cgroup_path) | |
786 | return 0; | |
787 | ||
788 | if (u->cgroup_inotify_wd >= 0) | |
789 | return 0; | |
790 | ||
791 | /* Only applies to the unified hierarchy */ | |
792 | r = cg_unified(); | |
793 | if (r < 0) | |
794 | return log_unit_error_errno(u, r, "Failed detect wether the unified hierarchy is used: %m"); | |
795 | if (r == 0) | |
796 | return 0; | |
797 | ||
798 | /* Don't watch the root slice, it's pointless. */ | |
799 | if (unit_has_name(u, SPECIAL_ROOT_SLICE)) | |
800 | return 0; | |
801 | ||
802 | r = hashmap_ensure_allocated(&u->manager->cgroup_inotify_wd_unit, &trivial_hash_ops); | |
803 | if (r < 0) | |
804 | return log_oom(); | |
805 | ||
806 | r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, "cgroup.populated", &populated); | |
807 | if (r < 0) | |
808 | return log_oom(); | |
809 | ||
810 | u->cgroup_inotify_wd = inotify_add_watch(u->manager->cgroup_inotify_fd, populated, IN_MODIFY); | |
811 | if (u->cgroup_inotify_wd < 0) { | |
812 | ||
813 | if (errno == ENOENT) /* If the directory is already | |
814 | * gone we don't need to track | |
815 | * it, so this is not an error */ | |
816 | return 0; | |
817 | ||
818 | return log_unit_error_errno(u, errno, "Failed to add inotify watch descriptor for control group %s: %m", u->cgroup_path); | |
819 | } | |
820 | ||
821 | r = hashmap_put(u->manager->cgroup_inotify_wd_unit, INT_TO_PTR(u->cgroup_inotify_wd), u); | |
822 | if (r < 0) | |
823 | return log_unit_error_errno(u, r, "Failed to add inotify watch descriptor to hash map: %m"); | |
824 | ||
825 | return 0; | |
826 | } | |
827 | ||
828 | static int unit_create_cgroup( | |
829 | Unit *u, | |
830 | CGroupMask target_mask, | |
831 | CGroupMask enable_mask) { | |
832 | ||
833 | CGroupContext *c; | |
834 | int r; | |
835 | ||
836 | assert(u); | |
837 | ||
838 | c = unit_get_cgroup_context(u); | |
839 | if (!c) | |
840 | return 0; | |
841 | ||
842 | if (!u->cgroup_path) { | |
843 | _cleanup_free_ char *path = NULL; | |
844 | ||
845 | path = unit_default_cgroup_path(u); | |
846 | if (!path) | |
847 | return log_oom(); | |
848 | ||
849 | r = unit_set_cgroup_path(u, path); | |
850 | if (r == -EEXIST) | |
851 | return log_unit_error_errno(u, r, "Control group %s exists already.", path); | |
852 | if (r < 0) | |
853 | return log_unit_error_errno(u, r, "Failed to set unit's control group path to %s: %m", path); | |
854 | } | |
855 | ||
856 | /* First, create our own group */ | |
857 | r = cg_create_everywhere(u->manager->cgroup_supported, target_mask, u->cgroup_path); | |
858 | if (r < 0) | |
859 | return log_unit_error_errno(u, r, "Failed to create cgroup %s: %m", u->cgroup_path); | |
860 | ||
861 | /* Start watching it */ | |
862 | (void) unit_watch_cgroup(u); | |
863 | ||
864 | /* Enable all controllers we need */ | |
865 | r = cg_enable_everywhere(u->manager->cgroup_supported, enable_mask, u->cgroup_path); | |
866 | if (r < 0) | |
867 | log_unit_warning_errno(u, r, "Failed to enable controllers on cgroup %s, ignoring: %m", u->cgroup_path); | |
868 | ||
869 | /* Keep track that this is now realized */ | |
870 | u->cgroup_realized = true; | |
871 | u->cgroup_realized_mask = target_mask; | |
872 | ||
873 | if (u->type != UNIT_SLICE && !c->delegate) { | |
874 | ||
875 | /* Then, possibly move things over, but not if | |
876 | * subgroups may contain processes, which is the case | |
877 | * for slice and delegation units. */ | |
878 | r = cg_migrate_everywhere(u->manager->cgroup_supported, u->cgroup_path, u->cgroup_path, migrate_callback, u); | |
879 | if (r < 0) | |
880 | log_unit_warning_errno(u, r, "Failed to migrate cgroup from to %s, ignoring: %m", u->cgroup_path); | |
881 | } | |
882 | ||
883 | return 0; | |
884 | } | |
885 | ||
886 | int unit_attach_pids_to_cgroup(Unit *u) { | |
887 | int r; | |
888 | assert(u); | |
889 | ||
890 | r = unit_realize_cgroup(u); | |
891 | if (r < 0) | |
892 | return r; | |
893 | ||
894 | r = cg_attach_many_everywhere(u->manager->cgroup_supported, u->cgroup_path, u->pids, migrate_callback, u); | |
895 | if (r < 0) | |
896 | return r; | |
897 | ||
898 | return 0; | |
899 | } | |
900 | ||
901 | static bool unit_has_mask_realized(Unit *u, CGroupMask target_mask) { | |
902 | assert(u); | |
903 | ||
904 | return u->cgroup_realized && u->cgroup_realized_mask == target_mask; | |
905 | } | |
906 | ||
907 | static int unit_find_free_netclass_cgroup(Unit *u, uint32_t *ret) { | |
908 | ||
909 | uint32_t start, i; | |
910 | Manager *m; | |
911 | ||
912 | assert(u); | |
913 | ||
914 | m = u->manager; | |
915 | ||
916 | i = start = m->cgroup_netclass_registry_last; | |
917 | ||
918 | do { | |
919 | i++; | |
920 | ||
921 | if (!hashmap_get(m->cgroup_netclass_registry, UINT_TO_PTR(i))) { | |
922 | m->cgroup_netclass_registry_last = i; | |
923 | *ret = i; | |
924 | return 0; | |
925 | } | |
926 | ||
927 | if (i == UINT32_MAX) | |
928 | i = CGROUP_NETCLASS_FIXED_MAX; | |
929 | ||
930 | } while (i != start); | |
931 | ||
932 | return -ENOBUFS; | |
933 | } | |
934 | ||
935 | int unit_add_to_netclass_cgroup(Unit *u) { | |
936 | ||
937 | CGroupContext *cc; | |
938 | Unit *first; | |
939 | void *key; | |
940 | int r; | |
941 | ||
942 | assert(u); | |
943 | ||
944 | cc = unit_get_cgroup_context(u); | |
945 | if (!cc) | |
946 | return 0; | |
947 | ||
948 | switch (cc->netclass_type) { | |
949 | case CGROUP_NETCLASS_TYPE_NONE: | |
950 | return 0; | |
951 | ||
952 | case CGROUP_NETCLASS_TYPE_FIXED: | |
953 | u->cgroup_netclass_id = cc->netclass_id; | |
954 | break; | |
955 | ||
956 | case CGROUP_NETCLASS_TYPE_AUTO: | |
957 | /* Allocate a new ID in case it was requested and not done yet */ | |
958 | if (u->cgroup_netclass_id == 0) { | |
959 | r = unit_find_free_netclass_cgroup(u, &u->cgroup_netclass_id); | |
960 | if (r < 0) | |
961 | return r; | |
962 | ||
963 | log_debug("Dynamically assigned netclass cgroup id %" PRIu32 " to %s", u->cgroup_netclass_id, u->id); | |
964 | } | |
965 | ||
966 | break; | |
967 | } | |
968 | ||
969 | r = hashmap_ensure_allocated(&u->manager->cgroup_netclass_registry, &trivial_hash_ops); | |
970 | if (r < 0) | |
971 | return r; | |
972 | ||
973 | key = UINT32_TO_PTR(u->cgroup_netclass_id); | |
974 | first = hashmap_get(u->manager->cgroup_netclass_registry, key); | |
975 | ||
976 | if (first) { | |
977 | LIST_PREPEND(cgroup_netclass, first, u); | |
978 | return hashmap_replace(u->manager->cgroup_netclass_registry, key, u); | |
979 | } | |
980 | ||
981 | return hashmap_put(u->manager->cgroup_netclass_registry, key, u); | |
982 | } | |
983 | ||
984 | int unit_remove_from_netclass_cgroup(Unit *u) { | |
985 | ||
986 | Unit *head; | |
987 | void *key; | |
988 | ||
989 | assert(u); | |
990 | ||
991 | key = UINT32_TO_PTR(u->cgroup_netclass_id); | |
992 | ||
993 | LIST_FIND_HEAD(cgroup_netclass, u, head); | |
994 | LIST_REMOVE(cgroup_netclass, head, u); | |
995 | ||
996 | if (head) | |
997 | return hashmap_replace(u->manager->cgroup_netclass_registry, key, head); | |
998 | ||
999 | hashmap_remove(u->manager->cgroup_netclass_registry, key); | |
1000 | ||
1001 | return 0; | |
1002 | } | |
1003 | ||
1004 | /* Check if necessary controllers and attributes for a unit are in place. | |
1005 | * | |
1006 | * If so, do nothing. | |
1007 | * If not, create paths, move processes over, and set attributes. | |
1008 | * | |
1009 | * Returns 0 on success and < 0 on failure. */ | |
1010 | static int unit_realize_cgroup_now(Unit *u, ManagerState state) { | |
1011 | CGroupMask target_mask, enable_mask; | |
1012 | int r; | |
1013 | ||
1014 | assert(u); | |
1015 | ||
1016 | if (u->in_cgroup_queue) { | |
1017 | LIST_REMOVE(cgroup_queue, u->manager->cgroup_queue, u); | |
1018 | u->in_cgroup_queue = false; | |
1019 | } | |
1020 | ||
1021 | target_mask = unit_get_target_mask(u); | |
1022 | if (unit_has_mask_realized(u, target_mask)) | |
1023 | return 0; | |
1024 | ||
1025 | /* First, realize parents */ | |
1026 | if (UNIT_ISSET(u->slice)) { | |
1027 | r = unit_realize_cgroup_now(UNIT_DEREF(u->slice), state); | |
1028 | if (r < 0) | |
1029 | return r; | |
1030 | } | |
1031 | ||
1032 | /* And then do the real work */ | |
1033 | enable_mask = unit_get_enable_mask(u); | |
1034 | r = unit_create_cgroup(u, target_mask, enable_mask); | |
1035 | if (r < 0) | |
1036 | return r; | |
1037 | ||
1038 | /* Finally, apply the necessary attributes. */ | |
1039 | cgroup_context_apply(unit_get_cgroup_context(u), target_mask, u->cgroup_path, u->cgroup_netclass_id, state); | |
1040 | ||
1041 | return 0; | |
1042 | } | |
1043 | ||
1044 | static void unit_add_to_cgroup_queue(Unit *u) { | |
1045 | ||
1046 | if (u->in_cgroup_queue) | |
1047 | return; | |
1048 | ||
1049 | LIST_PREPEND(cgroup_queue, u->manager->cgroup_queue, u); | |
1050 | u->in_cgroup_queue = true; | |
1051 | } | |
1052 | ||
1053 | unsigned manager_dispatch_cgroup_queue(Manager *m) { | |
1054 | ManagerState state; | |
1055 | unsigned n = 0; | |
1056 | Unit *i; | |
1057 | int r; | |
1058 | ||
1059 | state = manager_state(m); | |
1060 | ||
1061 | while ((i = m->cgroup_queue)) { | |
1062 | assert(i->in_cgroup_queue); | |
1063 | ||
1064 | r = unit_realize_cgroup_now(i, state); | |
1065 | if (r < 0) | |
1066 | log_warning_errno(r, "Failed to realize cgroups for queued unit %s, ignoring: %m", i->id); | |
1067 | ||
1068 | n++; | |
1069 | } | |
1070 | ||
1071 | return n; | |
1072 | } | |
1073 | ||
1074 | static void unit_queue_siblings(Unit *u) { | |
1075 | Unit *slice; | |
1076 | ||
1077 | /* This adds the siblings of the specified unit and the | |
1078 | * siblings of all parent units to the cgroup queue. (But | |
1079 | * neither the specified unit itself nor the parents.) */ | |
1080 | ||
1081 | while ((slice = UNIT_DEREF(u->slice))) { | |
1082 | Iterator i; | |
1083 | Unit *m; | |
1084 | ||
1085 | SET_FOREACH(m, slice->dependencies[UNIT_BEFORE], i) { | |
1086 | if (m == u) | |
1087 | continue; | |
1088 | ||
1089 | /* Skip units that have a dependency on the slice | |
1090 | * but aren't actually in it. */ | |
1091 | if (UNIT_DEREF(m->slice) != slice) | |
1092 | continue; | |
1093 | ||
1094 | /* No point in doing cgroup application for units | |
1095 | * without active processes. */ | |
1096 | if (UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(m))) | |
1097 | continue; | |
1098 | ||
1099 | /* If the unit doesn't need any new controllers | |
1100 | * and has current ones realized, it doesn't need | |
1101 | * any changes. */ | |
1102 | if (unit_has_mask_realized(m, unit_get_target_mask(m))) | |
1103 | continue; | |
1104 | ||
1105 | unit_add_to_cgroup_queue(m); | |
1106 | } | |
1107 | ||
1108 | u = slice; | |
1109 | } | |
1110 | } | |
1111 | ||
1112 | int unit_realize_cgroup(Unit *u) { | |
1113 | assert(u); | |
1114 | ||
1115 | if (!UNIT_HAS_CGROUP_CONTEXT(u)) | |
1116 | return 0; | |
1117 | ||
1118 | /* So, here's the deal: when realizing the cgroups for this | |
1119 | * unit, we need to first create all parents, but there's more | |
1120 | * actually: for the weight-based controllers we also need to | |
1121 | * make sure that all our siblings (i.e. units that are in the | |
1122 | * same slice as we are) have cgroups, too. Otherwise, things | |
1123 | * would become very uneven as each of their processes would | |
1124 | * get as much resources as all our group together. This call | |
1125 | * will synchronously create the parent cgroups, but will | |
1126 | * defer work on the siblings to the next event loop | |
1127 | * iteration. */ | |
1128 | ||
1129 | /* Add all sibling slices to the cgroup queue. */ | |
1130 | unit_queue_siblings(u); | |
1131 | ||
1132 | /* And realize this one now (and apply the values) */ | |
1133 | return unit_realize_cgroup_now(u, manager_state(u->manager)); | |
1134 | } | |
1135 | ||
1136 | void unit_release_cgroup(Unit *u) { | |
1137 | assert(u); | |
1138 | ||
1139 | /* Forgets all cgroup details for this cgroup */ | |
1140 | ||
1141 | if (u->cgroup_path) { | |
1142 | (void) hashmap_remove(u->manager->cgroup_unit, u->cgroup_path); | |
1143 | u->cgroup_path = mfree(u->cgroup_path); | |
1144 | } | |
1145 | ||
1146 | if (u->cgroup_inotify_wd >= 0) { | |
1147 | if (inotify_rm_watch(u->manager->cgroup_inotify_fd, u->cgroup_inotify_wd) < 0) | |
1148 | log_unit_debug_errno(u, errno, "Failed to remove cgroup inotify watch %i for %s, ignoring", u->cgroup_inotify_wd, u->id); | |
1149 | ||
1150 | (void) hashmap_remove(u->manager->cgroup_inotify_wd_unit, INT_TO_PTR(u->cgroup_inotify_wd)); | |
1151 | u->cgroup_inotify_wd = -1; | |
1152 | } | |
1153 | } | |
1154 | ||
1155 | void unit_prune_cgroup(Unit *u) { | |
1156 | int r; | |
1157 | bool is_root_slice; | |
1158 | ||
1159 | assert(u); | |
1160 | ||
1161 | /* Removes the cgroup, if empty and possible, and stops watching it. */ | |
1162 | ||
1163 | if (!u->cgroup_path) | |
1164 | return; | |
1165 | ||
1166 | is_root_slice = unit_has_name(u, SPECIAL_ROOT_SLICE); | |
1167 | ||
1168 | r = cg_trim_everywhere(u->manager->cgroup_supported, u->cgroup_path, !is_root_slice); | |
1169 | if (r < 0) { | |
1170 | log_debug_errno(r, "Failed to destroy cgroup %s, ignoring: %m", u->cgroup_path); | |
1171 | return; | |
1172 | } | |
1173 | ||
1174 | if (is_root_slice) | |
1175 | return; | |
1176 | ||
1177 | unit_release_cgroup(u); | |
1178 | ||
1179 | u->cgroup_realized = false; | |
1180 | u->cgroup_realized_mask = 0; | |
1181 | } | |
1182 | ||
1183 | int unit_search_main_pid(Unit *u, pid_t *ret) { | |
1184 | _cleanup_fclose_ FILE *f = NULL; | |
1185 | pid_t pid = 0, npid, mypid; | |
1186 | int r; | |
1187 | ||
1188 | assert(u); | |
1189 | assert(ret); | |
1190 | ||
1191 | if (!u->cgroup_path) | |
1192 | return -ENXIO; | |
1193 | ||
1194 | r = cg_enumerate_processes(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, &f); | |
1195 | if (r < 0) | |
1196 | return r; | |
1197 | ||
1198 | mypid = getpid(); | |
1199 | while (cg_read_pid(f, &npid) > 0) { | |
1200 | pid_t ppid; | |
1201 | ||
1202 | if (npid == pid) | |
1203 | continue; | |
1204 | ||
1205 | /* Ignore processes that aren't our kids */ | |
1206 | if (get_parent_of_pid(npid, &ppid) >= 0 && ppid != mypid) | |
1207 | continue; | |
1208 | ||
1209 | if (pid != 0) | |
1210 | /* Dang, there's more than one daemonized PID | |
1211 | in this group, so we don't know what process | |
1212 | is the main process. */ | |
1213 | ||
1214 | return -ENODATA; | |
1215 | ||
1216 | pid = npid; | |
1217 | } | |
1218 | ||
1219 | *ret = pid; | |
1220 | return 0; | |
1221 | } | |
1222 | ||
1223 | static int unit_watch_pids_in_path(Unit *u, const char *path) { | |
1224 | _cleanup_closedir_ DIR *d = NULL; | |
1225 | _cleanup_fclose_ FILE *f = NULL; | |
1226 | int ret = 0, r; | |
1227 | ||
1228 | assert(u); | |
1229 | assert(path); | |
1230 | ||
1231 | r = cg_enumerate_processes(SYSTEMD_CGROUP_CONTROLLER, path, &f); | |
1232 | if (r < 0) | |
1233 | ret = r; | |
1234 | else { | |
1235 | pid_t pid; | |
1236 | ||
1237 | while ((r = cg_read_pid(f, &pid)) > 0) { | |
1238 | r = unit_watch_pid(u, pid); | |
1239 | if (r < 0 && ret >= 0) | |
1240 | ret = r; | |
1241 | } | |
1242 | ||
1243 | if (r < 0 && ret >= 0) | |
1244 | ret = r; | |
1245 | } | |
1246 | ||
1247 | r = cg_enumerate_subgroups(SYSTEMD_CGROUP_CONTROLLER, path, &d); | |
1248 | if (r < 0) { | |
1249 | if (ret >= 0) | |
1250 | ret = r; | |
1251 | } else { | |
1252 | char *fn; | |
1253 | ||
1254 | while ((r = cg_read_subgroup(d, &fn)) > 0) { | |
1255 | _cleanup_free_ char *p = NULL; | |
1256 | ||
1257 | p = strjoin(path, "/", fn, NULL); | |
1258 | free(fn); | |
1259 | ||
1260 | if (!p) | |
1261 | return -ENOMEM; | |
1262 | ||
1263 | r = unit_watch_pids_in_path(u, p); | |
1264 | if (r < 0 && ret >= 0) | |
1265 | ret = r; | |
1266 | } | |
1267 | ||
1268 | if (r < 0 && ret >= 0) | |
1269 | ret = r; | |
1270 | } | |
1271 | ||
1272 | return ret; | |
1273 | } | |
1274 | ||
1275 | int unit_watch_all_pids(Unit *u) { | |
1276 | assert(u); | |
1277 | ||
1278 | /* Adds all PIDs from our cgroup to the set of PIDs we | |
1279 | * watch. This is a fallback logic for cases where we do not | |
1280 | * get reliable cgroup empty notifications: we try to use | |
1281 | * SIGCHLD as replacement. */ | |
1282 | ||
1283 | if (!u->cgroup_path) | |
1284 | return -ENOENT; | |
1285 | ||
1286 | if (cg_unified() > 0) /* On unified we can use proper notifications */ | |
1287 | return 0; | |
1288 | ||
1289 | return unit_watch_pids_in_path(u, u->cgroup_path); | |
1290 | } | |
1291 | ||
1292 | int unit_notify_cgroup_empty(Unit *u) { | |
1293 | int r; | |
1294 | ||
1295 | assert(u); | |
1296 | ||
1297 | if (!u->cgroup_path) | |
1298 | return 0; | |
1299 | ||
1300 | r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path); | |
1301 | if (r <= 0) | |
1302 | return r; | |
1303 | ||
1304 | unit_add_to_gc_queue(u); | |
1305 | ||
1306 | if (UNIT_VTABLE(u)->notify_cgroup_empty) | |
1307 | UNIT_VTABLE(u)->notify_cgroup_empty(u); | |
1308 | ||
1309 | return 0; | |
1310 | } | |
1311 | ||
1312 | static int on_cgroup_inotify_event(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
1313 | Manager *m = userdata; | |
1314 | ||
1315 | assert(s); | |
1316 | assert(fd >= 0); | |
1317 | assert(m); | |
1318 | ||
1319 | for (;;) { | |
1320 | union inotify_event_buffer buffer; | |
1321 | struct inotify_event *e; | |
1322 | ssize_t l; | |
1323 | ||
1324 | l = read(fd, &buffer, sizeof(buffer)); | |
1325 | if (l < 0) { | |
1326 | if (errno == EINTR || errno == EAGAIN) | |
1327 | return 0; | |
1328 | ||
1329 | return log_error_errno(errno, "Failed to read control group inotify events: %m"); | |
1330 | } | |
1331 | ||
1332 | FOREACH_INOTIFY_EVENT(e, buffer, l) { | |
1333 | Unit *u; | |
1334 | ||
1335 | if (e->wd < 0) | |
1336 | /* Queue overflow has no watch descriptor */ | |
1337 | continue; | |
1338 | ||
1339 | if (e->mask & IN_IGNORED) | |
1340 | /* The watch was just removed */ | |
1341 | continue; | |
1342 | ||
1343 | u = hashmap_get(m->cgroup_inotify_wd_unit, INT_TO_PTR(e->wd)); | |
1344 | if (!u) /* Not that inotify might deliver | |
1345 | * events for a watch even after it | |
1346 | * was removed, because it was queued | |
1347 | * before the removal. Let's ignore | |
1348 | * this here safely. */ | |
1349 | continue; | |
1350 | ||
1351 | (void) unit_notify_cgroup_empty(u); | |
1352 | } | |
1353 | } | |
1354 | } | |
1355 | ||
1356 | int manager_setup_cgroup(Manager *m) { | |
1357 | _cleanup_free_ char *path = NULL; | |
1358 | CGroupController c; | |
1359 | int r, unified; | |
1360 | char *e; | |
1361 | ||
1362 | assert(m); | |
1363 | ||
1364 | /* 1. Determine hierarchy */ | |
1365 | m->cgroup_root = mfree(m->cgroup_root); | |
1366 | r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 0, &m->cgroup_root); | |
1367 | if (r < 0) | |
1368 | return log_error_errno(r, "Cannot determine cgroup we are running in: %m"); | |
1369 | ||
1370 | /* Chop off the init scope, if we are already located in it */ | |
1371 | e = endswith(m->cgroup_root, "/" SPECIAL_INIT_SCOPE); | |
1372 | ||
1373 | /* LEGACY: Also chop off the system slice if we are in | |
1374 | * it. This is to support live upgrades from older systemd | |
1375 | * versions where PID 1 was moved there. Also see | |
1376 | * cg_get_root_path(). */ | |
1377 | if (!e && m->running_as == MANAGER_SYSTEM) { | |
1378 | e = endswith(m->cgroup_root, "/" SPECIAL_SYSTEM_SLICE); | |
1379 | if (!e) | |
1380 | e = endswith(m->cgroup_root, "/system"); /* even more legacy */ | |
1381 | } | |
1382 | if (e) | |
1383 | *e = 0; | |
1384 | ||
1385 | /* And make sure to store away the root value without trailing | |
1386 | * slash, even for the root dir, so that we can easily prepend | |
1387 | * it everywhere. */ | |
1388 | while ((e = endswith(m->cgroup_root, "/"))) | |
1389 | *e = 0; | |
1390 | ||
1391 | /* 2. Show data */ | |
1392 | r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, NULL, &path); | |
1393 | if (r < 0) | |
1394 | return log_error_errno(r, "Cannot find cgroup mount point: %m"); | |
1395 | ||
1396 | unified = cg_unified(); | |
1397 | if (unified < 0) | |
1398 | return log_error_errno(r, "Couldn't determine if we are running in the unified hierarchy: %m"); | |
1399 | if (unified > 0) | |
1400 | log_debug("Unified cgroup hierarchy is located at %s.", path); | |
1401 | else | |
1402 | log_debug("Using cgroup controller " SYSTEMD_CGROUP_CONTROLLER ". File system hierarchy is at %s.", path); | |
1403 | ||
1404 | if (!m->test_run) { | |
1405 | const char *scope_path; | |
1406 | ||
1407 | /* 3. Install agent */ | |
1408 | if (unified) { | |
1409 | ||
1410 | /* In the unified hierarchy we can can get | |
1411 | * cgroup empty notifications via inotify. */ | |
1412 | ||
1413 | m->cgroup_inotify_event_source = sd_event_source_unref(m->cgroup_inotify_event_source); | |
1414 | safe_close(m->cgroup_inotify_fd); | |
1415 | ||
1416 | m->cgroup_inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC); | |
1417 | if (m->cgroup_inotify_fd < 0) | |
1418 | return log_error_errno(errno, "Failed to create control group inotify object: %m"); | |
1419 | ||
1420 | r = sd_event_add_io(m->event, &m->cgroup_inotify_event_source, m->cgroup_inotify_fd, EPOLLIN, on_cgroup_inotify_event, m); | |
1421 | if (r < 0) | |
1422 | return log_error_errno(r, "Failed to watch control group inotify object: %m"); | |
1423 | ||
1424 | r = sd_event_source_set_priority(m->cgroup_inotify_event_source, SD_EVENT_PRIORITY_IDLE - 5); | |
1425 | if (r < 0) | |
1426 | return log_error_errno(r, "Failed to set priority of inotify event source: %m"); | |
1427 | ||
1428 | (void) sd_event_source_set_description(m->cgroup_inotify_event_source, "cgroup-inotify"); | |
1429 | ||
1430 | } else if (m->running_as == MANAGER_SYSTEM) { | |
1431 | ||
1432 | /* On the legacy hierarchy we only get | |
1433 | * notifications via cgroup agents. (Which | |
1434 | * isn't really reliable, since it does not | |
1435 | * generate events when control groups with | |
1436 | * children run empty. */ | |
1437 | ||
1438 | r = cg_install_release_agent(SYSTEMD_CGROUP_CONTROLLER, SYSTEMD_CGROUP_AGENT_PATH); | |
1439 | if (r < 0) | |
1440 | log_warning_errno(r, "Failed to install release agent, ignoring: %m"); | |
1441 | else if (r > 0) | |
1442 | log_debug("Installed release agent."); | |
1443 | else if (r == 0) | |
1444 | log_debug("Release agent already installed."); | |
1445 | } | |
1446 | ||
1447 | /* 4. Make sure we are in the special "init.scope" unit in the root slice. */ | |
1448 | scope_path = strjoina(m->cgroup_root, "/" SPECIAL_INIT_SCOPE); | |
1449 | r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, scope_path, 0); | |
1450 | if (r < 0) | |
1451 | return log_error_errno(r, "Failed to create %s control group: %m", scope_path); | |
1452 | ||
1453 | /* also, move all other userspace processes remaining | |
1454 | * in the root cgroup into that scope. */ | |
1455 | r = cg_migrate(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, SYSTEMD_CGROUP_CONTROLLER, scope_path, false); | |
1456 | if (r < 0) | |
1457 | log_warning_errno(r, "Couldn't move remaining userspace processes, ignoring: %m"); | |
1458 | ||
1459 | /* 5. And pin it, so that it cannot be unmounted */ | |
1460 | safe_close(m->pin_cgroupfs_fd); | |
1461 | m->pin_cgroupfs_fd = open(path, O_RDONLY|O_CLOEXEC|O_DIRECTORY|O_NOCTTY|O_NONBLOCK); | |
1462 | if (m->pin_cgroupfs_fd < 0) | |
1463 | return log_error_errno(errno, "Failed to open pin file: %m"); | |
1464 | ||
1465 | /* 6. Always enable hierarchical support if it exists... */ | |
1466 | if (!unified) | |
1467 | (void) cg_set_attribute("memory", "/", "memory.use_hierarchy", "1"); | |
1468 | } | |
1469 | ||
1470 | /* 7. Figure out which controllers are supported */ | |
1471 | r = cg_mask_supported(&m->cgroup_supported); | |
1472 | if (r < 0) | |
1473 | return log_error_errno(r, "Failed to determine supported controllers: %m"); | |
1474 | ||
1475 | for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) | |
1476 | log_debug("Controller '%s' supported: %s", cgroup_controller_to_string(c), yes_no(m->cgroup_supported & c)); | |
1477 | ||
1478 | return 0; | |
1479 | } | |
1480 | ||
1481 | void manager_shutdown_cgroup(Manager *m, bool delete) { | |
1482 | assert(m); | |
1483 | ||
1484 | /* We can't really delete the group, since we are in it. But | |
1485 | * let's trim it. */ | |
1486 | if (delete && m->cgroup_root) | |
1487 | (void) cg_trim(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, false); | |
1488 | ||
1489 | m->cgroup_inotify_wd_unit = hashmap_free(m->cgroup_inotify_wd_unit); | |
1490 | ||
1491 | m->cgroup_inotify_event_source = sd_event_source_unref(m->cgroup_inotify_event_source); | |
1492 | m->cgroup_inotify_fd = safe_close(m->cgroup_inotify_fd); | |
1493 | ||
1494 | m->pin_cgroupfs_fd = safe_close(m->pin_cgroupfs_fd); | |
1495 | ||
1496 | m->cgroup_root = mfree(m->cgroup_root); | |
1497 | } | |
1498 | ||
1499 | Unit* manager_get_unit_by_cgroup(Manager *m, const char *cgroup) { | |
1500 | char *p; | |
1501 | Unit *u; | |
1502 | ||
1503 | assert(m); | |
1504 | assert(cgroup); | |
1505 | ||
1506 | u = hashmap_get(m->cgroup_unit, cgroup); | |
1507 | if (u) | |
1508 | return u; | |
1509 | ||
1510 | p = strdupa(cgroup); | |
1511 | for (;;) { | |
1512 | char *e; | |
1513 | ||
1514 | e = strrchr(p, '/'); | |
1515 | if (!e || e == p) | |
1516 | return hashmap_get(m->cgroup_unit, SPECIAL_ROOT_SLICE); | |
1517 | ||
1518 | *e = 0; | |
1519 | ||
1520 | u = hashmap_get(m->cgroup_unit, p); | |
1521 | if (u) | |
1522 | return u; | |
1523 | } | |
1524 | } | |
1525 | ||
1526 | Unit *manager_get_unit_by_pid_cgroup(Manager *m, pid_t pid) { | |
1527 | _cleanup_free_ char *cgroup = NULL; | |
1528 | int r; | |
1529 | ||
1530 | assert(m); | |
1531 | ||
1532 | if (pid <= 0) | |
1533 | return NULL; | |
1534 | ||
1535 | r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, pid, &cgroup); | |
1536 | if (r < 0) | |
1537 | return NULL; | |
1538 | ||
1539 | return manager_get_unit_by_cgroup(m, cgroup); | |
1540 | } | |
1541 | ||
1542 | Unit *manager_get_unit_by_pid(Manager *m, pid_t pid) { | |
1543 | Unit *u; | |
1544 | ||
1545 | assert(m); | |
1546 | ||
1547 | if (pid <= 0) | |
1548 | return NULL; | |
1549 | ||
1550 | if (pid == 1) | |
1551 | return hashmap_get(m->units, SPECIAL_INIT_SCOPE); | |
1552 | ||
1553 | u = hashmap_get(m->watch_pids1, PID_TO_PTR(pid)); | |
1554 | if (u) | |
1555 | return u; | |
1556 | ||
1557 | u = hashmap_get(m->watch_pids2, PID_TO_PTR(pid)); | |
1558 | if (u) | |
1559 | return u; | |
1560 | ||
1561 | return manager_get_unit_by_pid_cgroup(m, pid); | |
1562 | } | |
1563 | ||
1564 | int manager_notify_cgroup_empty(Manager *m, const char *cgroup) { | |
1565 | Unit *u; | |
1566 | ||
1567 | assert(m); | |
1568 | assert(cgroup); | |
1569 | ||
1570 | u = manager_get_unit_by_cgroup(m, cgroup); | |
1571 | if (!u) | |
1572 | return 0; | |
1573 | ||
1574 | return unit_notify_cgroup_empty(u); | |
1575 | } | |
1576 | ||
1577 | int unit_get_memory_current(Unit *u, uint64_t *ret) { | |
1578 | _cleanup_free_ char *v = NULL; | |
1579 | int r; | |
1580 | ||
1581 | assert(u); | |
1582 | assert(ret); | |
1583 | ||
1584 | if (!u->cgroup_path) | |
1585 | return -ENODATA; | |
1586 | ||
1587 | if ((u->cgroup_realized_mask & CGROUP_MASK_MEMORY) == 0) | |
1588 | return -ENODATA; | |
1589 | ||
1590 | if (cg_unified() <= 0) | |
1591 | r = cg_get_attribute("memory", u->cgroup_path, "memory.usage_in_bytes", &v); | |
1592 | else | |
1593 | r = cg_get_attribute("memory", u->cgroup_path, "memory.current", &v); | |
1594 | if (r == -ENOENT) | |
1595 | return -ENODATA; | |
1596 | if (r < 0) | |
1597 | return r; | |
1598 | ||
1599 | return safe_atou64(v, ret); | |
1600 | } | |
1601 | ||
1602 | int unit_get_tasks_current(Unit *u, uint64_t *ret) { | |
1603 | _cleanup_free_ char *v = NULL; | |
1604 | int r; | |
1605 | ||
1606 | assert(u); | |
1607 | assert(ret); | |
1608 | ||
1609 | if (!u->cgroup_path) | |
1610 | return -ENODATA; | |
1611 | ||
1612 | if ((u->cgroup_realized_mask & CGROUP_MASK_PIDS) == 0) | |
1613 | return -ENODATA; | |
1614 | ||
1615 | r = cg_get_attribute("pids", u->cgroup_path, "pids.current", &v); | |
1616 | if (r == -ENOENT) | |
1617 | return -ENODATA; | |
1618 | if (r < 0) | |
1619 | return r; | |
1620 | ||
1621 | return safe_atou64(v, ret); | |
1622 | } | |
1623 | ||
1624 | static int unit_get_cpu_usage_raw(Unit *u, nsec_t *ret) { | |
1625 | _cleanup_free_ char *v = NULL; | |
1626 | uint64_t ns; | |
1627 | int r; | |
1628 | ||
1629 | assert(u); | |
1630 | assert(ret); | |
1631 | ||
1632 | if (!u->cgroup_path) | |
1633 | return -ENODATA; | |
1634 | ||
1635 | if ((u->cgroup_realized_mask & CGROUP_MASK_CPUACCT) == 0) | |
1636 | return -ENODATA; | |
1637 | ||
1638 | r = cg_get_attribute("cpuacct", u->cgroup_path, "cpuacct.usage", &v); | |
1639 | if (r == -ENOENT) | |
1640 | return -ENODATA; | |
1641 | if (r < 0) | |
1642 | return r; | |
1643 | ||
1644 | r = safe_atou64(v, &ns); | |
1645 | if (r < 0) | |
1646 | return r; | |
1647 | ||
1648 | *ret = ns; | |
1649 | return 0; | |
1650 | } | |
1651 | ||
1652 | int unit_get_cpu_usage(Unit *u, nsec_t *ret) { | |
1653 | nsec_t ns; | |
1654 | int r; | |
1655 | ||
1656 | r = unit_get_cpu_usage_raw(u, &ns); | |
1657 | if (r < 0) | |
1658 | return r; | |
1659 | ||
1660 | if (ns > u->cpuacct_usage_base) | |
1661 | ns -= u->cpuacct_usage_base; | |
1662 | else | |
1663 | ns = 0; | |
1664 | ||
1665 | *ret = ns; | |
1666 | return 0; | |
1667 | } | |
1668 | ||
1669 | int unit_reset_cpu_usage(Unit *u) { | |
1670 | nsec_t ns; | |
1671 | int r; | |
1672 | ||
1673 | assert(u); | |
1674 | ||
1675 | r = unit_get_cpu_usage_raw(u, &ns); | |
1676 | if (r < 0) { | |
1677 | u->cpuacct_usage_base = 0; | |
1678 | return r; | |
1679 | } | |
1680 | ||
1681 | u->cpuacct_usage_base = ns; | |
1682 | return 0; | |
1683 | } | |
1684 | ||
1685 | bool unit_cgroup_delegate(Unit *u) { | |
1686 | CGroupContext *c; | |
1687 | ||
1688 | assert(u); | |
1689 | ||
1690 | c = unit_get_cgroup_context(u); | |
1691 | if (!c) | |
1692 | return false; | |
1693 | ||
1694 | return c->delegate; | |
1695 | } | |
1696 | ||
1697 | void unit_invalidate_cgroup(Unit *u, CGroupMask m) { | |
1698 | assert(u); | |
1699 | ||
1700 | if (!UNIT_HAS_CGROUP_CONTEXT(u)) | |
1701 | return; | |
1702 | ||
1703 | if (m == 0) | |
1704 | return; | |
1705 | ||
1706 | if ((u->cgroup_realized_mask & m) == 0) | |
1707 | return; | |
1708 | ||
1709 | u->cgroup_realized_mask &= ~m; | |
1710 | unit_add_to_cgroup_queue(u); | |
1711 | } | |
1712 | ||
1713 | void manager_invalidate_startup_units(Manager *m) { | |
1714 | Iterator i; | |
1715 | Unit *u; | |
1716 | ||
1717 | assert(m); | |
1718 | ||
1719 | SET_FOREACH(u, m->startup_units, i) | |
1720 | unit_invalidate_cgroup(u, CGROUP_MASK_CPU|CGROUP_MASK_BLKIO); | |
1721 | } | |
1722 | ||
1723 | static const char* const cgroup_device_policy_table[_CGROUP_DEVICE_POLICY_MAX] = { | |
1724 | [CGROUP_AUTO] = "auto", | |
1725 | [CGROUP_CLOSED] = "closed", | |
1726 | [CGROUP_STRICT] = "strict", | |
1727 | }; | |
1728 | ||
1729 | DEFINE_STRING_TABLE_LOOKUP(cgroup_device_policy, CGroupDevicePolicy); |