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d6c9574f | 1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
8e274523 LP |
2 | |
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
4ad49000 | 6 | Copyright 2013 Lennart Poettering |
8e274523 LP |
7 | |
8 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
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 | |
8e274523 LP |
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 | |
5430f7f2 | 16 | Lesser General Public License for more details. |
8e274523 | 17 | |
5430f7f2 | 18 | You should have received a copy of the GNU Lesser General Public License |
8e274523 LP |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
20 | ***/ | |
21 | ||
c6c18be3 | 22 | #include <fcntl.h> |
e41969e3 | 23 | #include <fnmatch.h> |
8c6db833 | 24 | |
9eb977db | 25 | #include "path-util.h" |
9444b1f2 | 26 | #include "special.h" |
4ad49000 LP |
27 | #include "cgroup-util.h" |
28 | #include "cgroup.h" | |
8e274523 | 29 | |
4ad49000 LP |
30 | void cgroup_context_init(CGroupContext *c) { |
31 | assert(c); | |
32 | ||
33 | /* Initialize everything to the kernel defaults, assuming the | |
34 | * structure is preinitialized to 0 */ | |
35 | ||
36 | c->cpu_shares = 1024; | |
ddca82ac | 37 | c->memory_limit = (uint64_t) -1; |
4ad49000 | 38 | c->blockio_weight = 1000; |
b2f8b02e LP |
39 | |
40 | c->cpu_quota_per_sec_usec = (usec_t) -1; | |
41 | c->cpu_quota_usec = (usec_t) -1; | |
42 | c->cpu_quota_period_usec = 100*USEC_PER_MSEC; | |
4ad49000 | 43 | } |
8e274523 | 44 | |
4ad49000 LP |
45 | void cgroup_context_free_device_allow(CGroupContext *c, CGroupDeviceAllow *a) { |
46 | assert(c); | |
47 | assert(a); | |
48 | ||
71fda00f | 49 | LIST_REMOVE(device_allow, c->device_allow, a); |
4ad49000 LP |
50 | free(a->path); |
51 | free(a); | |
52 | } | |
53 | ||
54 | void cgroup_context_free_blockio_device_weight(CGroupContext *c, CGroupBlockIODeviceWeight *w) { | |
55 | assert(c); | |
56 | assert(w); | |
57 | ||
71fda00f | 58 | LIST_REMOVE(device_weights, c->blockio_device_weights, w); |
4ad49000 LP |
59 | free(w->path); |
60 | free(w); | |
61 | } | |
62 | ||
63 | void cgroup_context_free_blockio_device_bandwidth(CGroupContext *c, CGroupBlockIODeviceBandwidth *b) { | |
64 | assert(c); | |
8e274523 | 65 | assert(b); |
8e274523 | 66 | |
71fda00f | 67 | LIST_REMOVE(device_bandwidths, c->blockio_device_bandwidths, b); |
4ad49000 LP |
68 | free(b->path); |
69 | free(b); | |
70 | } | |
71 | ||
72 | void cgroup_context_done(CGroupContext *c) { | |
73 | assert(c); | |
74 | ||
75 | while (c->blockio_device_weights) | |
76 | cgroup_context_free_blockio_device_weight(c, c->blockio_device_weights); | |
77 | ||
78 | while (c->blockio_device_bandwidths) | |
79 | cgroup_context_free_blockio_device_bandwidth(c, c->blockio_device_bandwidths); | |
80 | ||
81 | while (c->device_allow) | |
82 | cgroup_context_free_device_allow(c, c->device_allow); | |
83 | } | |
84 | ||
b2f8b02e LP |
85 | usec_t cgroup_context_get_cpu_quota_usec(CGroupContext *c) { |
86 | assert(c); | |
87 | ||
88 | /* Returns the absolute CPU quota */ | |
89 | ||
90 | if (c->cpu_quota_usec != (usec_t) -1) | |
91 | return c->cpu_quota_usec; | |
92 | else if (c->cpu_quota_per_sec_usec != (usec_t) -1) | |
93 | return c->cpu_quota_per_sec_usec*c->cpu_quota_period_usec/USEC_PER_SEC; | |
94 | else | |
95 | return (usec_t) -1; | |
96 | } | |
97 | ||
98 | usec_t cgroup_context_get_cpu_quota_per_sec_usec(CGroupContext *c) { | |
99 | assert(c); | |
100 | ||
101 | /* Returns the CPU quota relative to 1s */ | |
102 | ||
103 | if (c->cpu_quota_usec != (usec_t) -1) | |
104 | return c->cpu_quota_usec*USEC_PER_SEC/c->cpu_quota_period_usec; | |
105 | else if (c->cpu_quota_per_sec_usec != (usec_t) -1) | |
106 | return c->cpu_quota_per_sec_usec; | |
107 | else | |
108 | return (usec_t) -1; | |
109 | } | |
110 | ||
4ad49000 LP |
111 | void cgroup_context_dump(CGroupContext *c, FILE* f, const char *prefix) { |
112 | CGroupBlockIODeviceBandwidth *b; | |
113 | CGroupBlockIODeviceWeight *w; | |
114 | CGroupDeviceAllow *a; | |
b2f8b02e | 115 | char t[FORMAT_TIMESPAN_MAX], s[FORMAT_TIMESPAN_MAX], u[FORMAT_TIMESPAN_MAX]; |
4ad49000 LP |
116 | |
117 | assert(c); | |
118 | assert(f); | |
119 | ||
120 | prefix = strempty(prefix); | |
121 | ||
122 | fprintf(f, | |
123 | "%sCPUAccounting=%s\n" | |
124 | "%sBlockIOAccounting=%s\n" | |
125 | "%sMemoryAccounting=%s\n" | |
126 | "%sCPUShares=%lu\n" | |
b2f8b02e LP |
127 | "%sCPUQuota=%s\n" |
128 | "%sCPUQuotaPerSecSec=%s\n" | |
129 | "%sCPUQuotaPeriodSec=%s\n" | |
112a7f46 | 130 | "%sBlockIOWeight=%lu\n" |
4ad49000 | 131 | "%sMemoryLimit=%" PRIu64 "\n" |
4ad49000 LP |
132 | "%sDevicePolicy=%s\n", |
133 | prefix, yes_no(c->cpu_accounting), | |
134 | prefix, yes_no(c->blockio_accounting), | |
135 | prefix, yes_no(c->memory_accounting), | |
136 | prefix, c->cpu_shares, | |
b2f8b02e LP |
137 | prefix, strna(format_timespan(u, sizeof(u), cgroup_context_get_cpu_quota_usec(c), 1)), |
138 | prefix, strna(format_timespan(t, sizeof(t), cgroup_context_get_cpu_quota_per_sec_usec(c), 1)), | |
139 | prefix, strna(format_timespan(s, sizeof(s), c->cpu_quota_period_usec, 1)), | |
4ad49000 LP |
140 | prefix, c->blockio_weight, |
141 | prefix, c->memory_limit, | |
4ad49000 LP |
142 | prefix, cgroup_device_policy_to_string(c->device_policy)); |
143 | ||
144 | LIST_FOREACH(device_allow, a, c->device_allow) | |
145 | fprintf(f, | |
146 | "%sDeviceAllow=%s %s%s%s\n", | |
147 | prefix, | |
148 | a->path, | |
149 | a->r ? "r" : "", a->w ? "w" : "", a->m ? "m" : ""); | |
150 | ||
151 | LIST_FOREACH(device_weights, w, c->blockio_device_weights) | |
152 | fprintf(f, | |
8e7076ca | 153 | "%sBlockIODeviceWeight=%s %lu", |
4ad49000 LP |
154 | prefix, |
155 | w->path, | |
156 | w->weight); | |
157 | ||
158 | LIST_FOREACH(device_bandwidths, b, c->blockio_device_bandwidths) { | |
159 | char buf[FORMAT_BYTES_MAX]; | |
160 | ||
161 | fprintf(f, | |
162 | "%s%s=%s %s\n", | |
163 | prefix, | |
164 | b->read ? "BlockIOReadBandwidth" : "BlockIOWriteBandwidth", | |
165 | b->path, | |
166 | format_bytes(buf, sizeof(buf), b->bandwidth)); | |
167 | } | |
168 | } | |
169 | ||
170 | static int lookup_blkio_device(const char *p, dev_t *dev) { | |
171 | struct stat st; | |
172 | int r; | |
173 | ||
174 | assert(p); | |
175 | assert(dev); | |
176 | ||
177 | r = stat(p, &st); | |
ab1f0633 | 178 | if (r < 0) { |
4ad49000 LP |
179 | log_warning("Couldn't stat device %s: %m", p); |
180 | return -errno; | |
ab1f0633 | 181 | } |
8e274523 | 182 | |
4ad49000 LP |
183 | if (S_ISBLK(st.st_mode)) |
184 | *dev = st.st_rdev; | |
185 | else if (major(st.st_dev) != 0) { | |
186 | /* If this is not a device node then find the block | |
187 | * device this file is stored on */ | |
188 | *dev = st.st_dev; | |
189 | ||
190 | /* If this is a partition, try to get the originating | |
191 | * block device */ | |
192 | block_get_whole_disk(*dev, dev); | |
193 | } else { | |
194 | log_warning("%s is not a block device and file system block device cannot be determined or is not local.", p); | |
195 | return -ENODEV; | |
196 | } | |
8e274523 | 197 | |
8e274523 | 198 | return 0; |
8e274523 LP |
199 | } |
200 | ||
4ad49000 LP |
201 | static int whitelist_device(const char *path, const char *node, const char *acc) { |
202 | char buf[2+DECIMAL_STR_MAX(dev_t)*2+2+4]; | |
203 | struct stat st; | |
8c6db833 | 204 | int r; |
8e274523 | 205 | |
4ad49000 LP |
206 | assert(path); |
207 | assert(acc); | |
8e274523 | 208 | |
4ad49000 LP |
209 | if (stat(node, &st) < 0) { |
210 | log_warning("Couldn't stat device %s", node); | |
211 | return -errno; | |
212 | } | |
213 | ||
214 | if (!S_ISCHR(st.st_mode) && !S_ISBLK(st.st_mode)) { | |
215 | log_warning("%s is not a device.", node); | |
216 | return -ENODEV; | |
217 | } | |
218 | ||
219 | sprintf(buf, | |
220 | "%c %u:%u %s", | |
221 | S_ISCHR(st.st_mode) ? 'c' : 'b', | |
222 | major(st.st_rdev), minor(st.st_rdev), | |
223 | acc); | |
224 | ||
225 | r = cg_set_attribute("devices", path, "devices.allow", buf); | |
226 | if (r < 0) | |
227 | log_warning("Failed to set devices.allow on %s: %s", path, strerror(-r)); | |
228 | ||
229 | return r; | |
8e274523 LP |
230 | } |
231 | ||
90060676 LP |
232 | static int whitelist_major(const char *path, const char *name, char type, const char *acc) { |
233 | _cleanup_fclose_ FILE *f = NULL; | |
234 | char line[LINE_MAX]; | |
235 | bool good = false; | |
236 | int r; | |
237 | ||
238 | assert(path); | |
239 | assert(acc); | |
240 | assert(type == 'b' || type == 'c'); | |
241 | ||
242 | f = fopen("/proc/devices", "re"); | |
243 | if (!f) { | |
244 | log_warning("Cannot open /proc/devices to resolve %s (%c): %m", name, type); | |
245 | return -errno; | |
246 | } | |
247 | ||
248 | FOREACH_LINE(line, f, goto fail) { | |
249 | char buf[2+DECIMAL_STR_MAX(unsigned)+3+4], *p, *w; | |
250 | unsigned maj; | |
251 | ||
252 | truncate_nl(line); | |
253 | ||
254 | if (type == 'c' && streq(line, "Character devices:")) { | |
255 | good = true; | |
256 | continue; | |
257 | } | |
258 | ||
259 | if (type == 'b' && streq(line, "Block devices:")) { | |
260 | good = true; | |
261 | continue; | |
262 | } | |
263 | ||
264 | if (isempty(line)) { | |
265 | good = false; | |
266 | continue; | |
267 | } | |
268 | ||
269 | if (!good) | |
270 | continue; | |
271 | ||
272 | p = strstrip(line); | |
273 | ||
274 | w = strpbrk(p, WHITESPACE); | |
275 | if (!w) | |
276 | continue; | |
277 | *w = 0; | |
278 | ||
279 | r = safe_atou(p, &maj); | |
280 | if (r < 0) | |
281 | continue; | |
282 | if (maj <= 0) | |
283 | continue; | |
284 | ||
285 | w++; | |
286 | w += strspn(w, WHITESPACE); | |
e41969e3 LP |
287 | |
288 | if (fnmatch(name, w, 0) != 0) | |
90060676 LP |
289 | continue; |
290 | ||
291 | sprintf(buf, | |
292 | "%c %u:* %s", | |
293 | type, | |
294 | maj, | |
295 | acc); | |
296 | ||
297 | r = cg_set_attribute("devices", path, "devices.allow", buf); | |
298 | if (r < 0) | |
299 | log_warning("Failed to set devices.allow on %s: %s", path, strerror(-r)); | |
300 | } | |
301 | ||
302 | return 0; | |
303 | ||
304 | fail: | |
305 | log_warning("Failed to read /proc/devices: %m"); | |
306 | return -errno; | |
307 | } | |
308 | ||
4ad49000 | 309 | void cgroup_context_apply(CGroupContext *c, CGroupControllerMask mask, const char *path) { |
01efdf13 | 310 | bool is_root; |
4ad49000 LP |
311 | int r; |
312 | ||
313 | assert(c); | |
314 | assert(path); | |
8e274523 | 315 | |
4ad49000 LP |
316 | if (mask == 0) |
317 | return; | |
8e274523 | 318 | |
01efdf13 LP |
319 | /* Some cgroup attributes are not support on the root cgroup, |
320 | * hence silently ignore */ | |
321 | is_root = isempty(path) || path_equal(path, "/"); | |
322 | ||
323 | if ((mask & CGROUP_CPU) && !is_root) { | |
b2f8b02e LP |
324 | char buf[MAX(DECIMAL_STR_MAX(unsigned long), DECIMAL_STR_MAX(usec_t)) + 1]; |
325 | usec_t q; | |
8e274523 | 326 | |
4ad49000 LP |
327 | sprintf(buf, "%lu\n", c->cpu_shares); |
328 | r = cg_set_attribute("cpu", path, "cpu.shares", buf); | |
329 | if (r < 0) | |
330 | log_warning("Failed to set cpu.shares on %s: %s", path, strerror(-r)); | |
b2f8b02e LP |
331 | |
332 | sprintf(buf, USEC_FMT "\n", c->cpu_quota_period_usec); | |
333 | r = cg_set_attribute("cpu", path, "cpu.cfs_period_us", buf); | |
334 | if (r < 0) | |
335 | log_warning("Failed to set cpu.cfs_period_us on %s: %s", path, strerror(-r)); | |
336 | ||
337 | q = cgroup_context_get_cpu_quota_usec(c); | |
338 | if (q != (usec_t) -1) { | |
339 | sprintf(buf, USEC_FMT "\n", q); | |
340 | r = cg_set_attribute("cpu", path, "cpu.cfs_quota_us", buf); | |
341 | } else | |
342 | r = cg_set_attribute("cpu", path, "cpu.cfs_quota_us", "-1"); | |
343 | if (r < 0) | |
344 | log_warning("Failed to set cpu.cfs_quota_us on %s: %s", path, strerror(-r)); | |
4ad49000 LP |
345 | } |
346 | ||
347 | if (mask & CGROUP_BLKIO) { | |
348 | char buf[MAX3(DECIMAL_STR_MAX(unsigned long)+1, | |
349 | DECIMAL_STR_MAX(dev_t)*2+2+DECIMAL_STR_MAX(unsigned long)*1, | |
350 | DECIMAL_STR_MAX(dev_t)*2+2+DECIMAL_STR_MAX(uint64_t)+1)]; | |
351 | CGroupBlockIODeviceWeight *w; | |
352 | CGroupBlockIODeviceBandwidth *b; | |
353 | ||
01efdf13 LP |
354 | if (!is_root) { |
355 | sprintf(buf, "%lu\n", c->blockio_weight); | |
356 | r = cg_set_attribute("blkio", path, "blkio.weight", buf); | |
357 | if (r < 0) | |
358 | log_warning("Failed to set blkio.weight on %s: %s", path, strerror(-r)); | |
4ad49000 | 359 | |
01efdf13 LP |
360 | /* FIXME: no way to reset this list */ |
361 | LIST_FOREACH(device_weights, w, c->blockio_device_weights) { | |
362 | dev_t dev; | |
4ad49000 | 363 | |
01efdf13 LP |
364 | r = lookup_blkio_device(w->path, &dev); |
365 | if (r < 0) | |
366 | continue; | |
8e274523 | 367 | |
01efdf13 LP |
368 | sprintf(buf, "%u:%u %lu", major(dev), minor(dev), w->weight); |
369 | r = cg_set_attribute("blkio", path, "blkio.weight_device", buf); | |
370 | if (r < 0) | |
371 | log_error("Failed to set blkio.weight_device on %s: %s", path, strerror(-r)); | |
372 | } | |
4ad49000 LP |
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_error("Failed to set %s on %s: %s", a, path, strerror(-r)); | |
d686d8a9 | 390 | } |
8e274523 LP |
391 | } |
392 | ||
4ad49000 | 393 | if (mask & CGROUP_MEMORY) { |
6a94f2e9 | 394 | if (c->memory_limit != (uint64_t) -1) { |
e58cec11 LP |
395 | char buf[DECIMAL_STR_MAX(uint64_t) + 1]; |
396 | ||
6a94f2e9 G |
397 | sprintf(buf, "%" PRIu64 "\n", c->memory_limit); |
398 | r = cg_set_attribute("memory", path, "memory.limit_in_bytes", buf); | |
399 | } else | |
400 | r = cg_set_attribute("memory", path, "memory.limit_in_bytes", "-1"); | |
8e274523 | 401 | |
4ad49000 LP |
402 | if (r < 0) |
403 | log_error("Failed to set memory.limit_in_bytes on %s: %s", path, strerror(-r)); | |
4ad49000 | 404 | } |
8e274523 | 405 | |
01efdf13 | 406 | if ((mask & CGROUP_DEVICE) && !is_root) { |
4ad49000 | 407 | CGroupDeviceAllow *a; |
8e274523 | 408 | |
4ad49000 LP |
409 | if (c->device_allow || c->device_policy != CGROUP_AUTO) |
410 | r = cg_set_attribute("devices", path, "devices.deny", "a"); | |
411 | else | |
412 | r = cg_set_attribute("devices", path, "devices.allow", "a"); | |
413 | if (r < 0) | |
01efdf13 | 414 | log_warning("Failed to reset devices.list on %s: %s", path, strerror(-r)); |
fb385181 | 415 | |
4ad49000 LP |
416 | if (c->device_policy == CGROUP_CLOSED || |
417 | (c->device_policy == CGROUP_AUTO && c->device_allow)) { | |
418 | static const char auto_devices[] = | |
7d711efb LP |
419 | "/dev/null\0" "rwm\0" |
420 | "/dev/zero\0" "rwm\0" | |
421 | "/dev/full\0" "rwm\0" | |
422 | "/dev/random\0" "rwm\0" | |
423 | "/dev/urandom\0" "rwm\0" | |
424 | "/dev/tty\0" "rwm\0" | |
425 | "/dev/pts/ptmx\0" "rw\0"; /* /dev/pts/ptmx may not be duplicated, but accessed */ | |
4ad49000 LP |
426 | |
427 | const char *x, *y; | |
428 | ||
429 | NULSTR_FOREACH_PAIR(x, y, auto_devices) | |
430 | whitelist_device(path, x, y); | |
7d711efb LP |
431 | |
432 | whitelist_major(path, "pts", 'c', "rw"); | |
433 | whitelist_major(path, "kdbus", 'c', "rw"); | |
434 | whitelist_major(path, "kdbus/*", 'c', "rw"); | |
4ad49000 LP |
435 | } |
436 | ||
437 | LIST_FOREACH(device_allow, a, c->device_allow) { | |
438 | char acc[4]; | |
439 | unsigned k = 0; | |
440 | ||
441 | if (a->r) | |
442 | acc[k++] = 'r'; | |
443 | if (a->w) | |
444 | acc[k++] = 'w'; | |
445 | if (a->m) | |
446 | acc[k++] = 'm'; | |
fb385181 | 447 | |
4ad49000 LP |
448 | if (k == 0) |
449 | continue; | |
fb385181 | 450 | |
4ad49000 | 451 | acc[k++] = 0; |
90060676 LP |
452 | |
453 | if (startswith(a->path, "/dev/")) | |
454 | whitelist_device(path, a->path, acc); | |
455 | else if (startswith(a->path, "block-")) | |
456 | whitelist_major(path, a->path + 6, 'b', acc); | |
457 | else if (startswith(a->path, "char-")) | |
458 | whitelist_major(path, a->path + 5, 'c', acc); | |
459 | else | |
460 | log_debug("Ignoring device %s while writing cgroup attribute.", a->path); | |
4ad49000 LP |
461 | } |
462 | } | |
fb385181 LP |
463 | } |
464 | ||
4ad49000 LP |
465 | CGroupControllerMask cgroup_context_get_mask(CGroupContext *c) { |
466 | CGroupControllerMask mask = 0; | |
8e274523 | 467 | |
4ad49000 | 468 | /* Figure out which controllers we need */ |
8e274523 | 469 | |
b2f8b02e LP |
470 | if (c->cpu_accounting || |
471 | c->cpu_shares != 1024 || | |
472 | c->cpu_quota_usec != (usec_t) -1 || | |
473 | c->cpu_quota_per_sec_usec != (usec_t) -1) | |
4ad49000 | 474 | mask |= CGROUP_CPUACCT | CGROUP_CPU; |
ecedd90f | 475 | |
4ad49000 LP |
476 | if (c->blockio_accounting || |
477 | c->blockio_weight != 1000 || | |
478 | c->blockio_device_weights || | |
479 | c->blockio_device_bandwidths) | |
480 | mask |= CGROUP_BLKIO; | |
ecedd90f | 481 | |
4ad49000 | 482 | if (c->memory_accounting || |
ddca82ac | 483 | c->memory_limit != (uint64_t) -1) |
4ad49000 | 484 | mask |= CGROUP_MEMORY; |
8e274523 | 485 | |
4ad49000 LP |
486 | if (c->device_allow || c->device_policy != CGROUP_AUTO) |
487 | mask |= CGROUP_DEVICE; | |
488 | ||
489 | return mask; | |
8e274523 LP |
490 | } |
491 | ||
bc432dc7 | 492 | CGroupControllerMask unit_get_cgroup_mask(Unit *u) { |
4ad49000 | 493 | CGroupContext *c; |
8e274523 | 494 | |
4ad49000 LP |
495 | c = unit_get_cgroup_context(u); |
496 | if (!c) | |
497 | return 0; | |
8e274523 | 498 | |
4ad49000 | 499 | return cgroup_context_get_mask(c); |
8e274523 LP |
500 | } |
501 | ||
bc432dc7 | 502 | CGroupControllerMask unit_get_members_mask(Unit *u) { |
4ad49000 | 503 | assert(u); |
bc432dc7 LP |
504 | |
505 | if (u->cgroup_members_mask_valid) | |
506 | return u->cgroup_members_mask; | |
507 | ||
508 | u->cgroup_members_mask = 0; | |
509 | ||
510 | if (u->type == UNIT_SLICE) { | |
511 | Unit *member; | |
512 | Iterator i; | |
513 | ||
514 | SET_FOREACH(member, u->dependencies[UNIT_BEFORE], i) { | |
515 | ||
516 | if (member == u) | |
517 | continue; | |
518 | ||
d4fdc205 | 519 | if (UNIT_DEREF(member->slice) != u) |
bc432dc7 LP |
520 | continue; |
521 | ||
522 | u->cgroup_members_mask |= | |
523 | unit_get_cgroup_mask(member) | | |
524 | unit_get_members_mask(member); | |
525 | } | |
526 | } | |
527 | ||
528 | u->cgroup_members_mask_valid = true; | |
6414b7c9 | 529 | return u->cgroup_members_mask; |
246aa6dd LP |
530 | } |
531 | ||
bc432dc7 LP |
532 | CGroupControllerMask unit_get_siblings_mask(Unit *u) { |
533 | CGroupControllerMask m; | |
534 | ||
4ad49000 | 535 | assert(u); |
246aa6dd | 536 | |
bc432dc7 LP |
537 | if (UNIT_ISSET(u->slice)) |
538 | m = unit_get_members_mask(UNIT_DEREF(u->slice)); | |
539 | else | |
540 | m = unit_get_cgroup_mask(u) | unit_get_members_mask(u); | |
4ad49000 LP |
541 | |
542 | /* Sibling propagation is only relevant for weight-based | |
543 | * controllers, so let's mask out everything else */ | |
bc432dc7 | 544 | return m & (CGROUP_CPU|CGROUP_BLKIO|CGROUP_CPUACCT); |
246aa6dd LP |
545 | } |
546 | ||
bc432dc7 | 547 | CGroupControllerMask unit_get_target_mask(Unit *u) { |
6414b7c9 DS |
548 | CGroupControllerMask mask; |
549 | ||
550 | mask = unit_get_cgroup_mask(u) | unit_get_members_mask(u) | unit_get_siblings_mask(u); | |
551 | mask &= u->manager->cgroup_supported; | |
552 | ||
553 | return mask; | |
554 | } | |
555 | ||
556 | /* Recurse from a unit up through its containing slices, propagating | |
557 | * mask bits upward. A unit is also member of itself. */ | |
bc432dc7 LP |
558 | void unit_update_cgroup_members_masks(Unit *u) { |
559 | CGroupControllerMask m; | |
560 | bool more; | |
561 | ||
562 | assert(u); | |
563 | ||
564 | /* Calculate subtree mask */ | |
565 | m = unit_get_cgroup_mask(u) | unit_get_members_mask(u); | |
566 | ||
567 | /* See if anything changed from the previous invocation. If | |
568 | * not, we're done. */ | |
569 | if (u->cgroup_subtree_mask_valid && m == u->cgroup_subtree_mask) | |
570 | return; | |
571 | ||
572 | more = | |
573 | u->cgroup_subtree_mask_valid && | |
574 | ((m & ~u->cgroup_subtree_mask) != 0) && | |
575 | ((~m & u->cgroup_subtree_mask) == 0); | |
576 | ||
577 | u->cgroup_subtree_mask = m; | |
578 | u->cgroup_subtree_mask_valid = true; | |
579 | ||
6414b7c9 DS |
580 | if (UNIT_ISSET(u->slice)) { |
581 | Unit *s = UNIT_DEREF(u->slice); | |
bc432dc7 LP |
582 | |
583 | if (more) | |
584 | /* There's more set now than before. We | |
585 | * propagate the new mask to the parent's mask | |
586 | * (not caring if it actually was valid or | |
587 | * not). */ | |
588 | ||
589 | s->cgroup_members_mask |= m; | |
590 | ||
591 | else | |
592 | /* There's less set now than before (or we | |
593 | * don't know), we need to recalculate | |
594 | * everything, so let's invalidate the | |
595 | * parent's members mask */ | |
596 | ||
597 | s->cgroup_members_mask_valid = false; | |
598 | ||
599 | /* And now make sure that this change also hits our | |
600 | * grandparents */ | |
601 | unit_update_cgroup_members_masks(s); | |
6414b7c9 DS |
602 | } |
603 | } | |
604 | ||
03b90d4b LP |
605 | static const char *migrate_callback(CGroupControllerMask mask, void *userdata) { |
606 | Unit *u = userdata; | |
607 | ||
608 | assert(mask != 0); | |
609 | assert(u); | |
610 | ||
611 | while (u) { | |
612 | if (u->cgroup_path && | |
613 | u->cgroup_realized && | |
614 | (u->cgroup_realized_mask & mask) == mask) | |
615 | return u->cgroup_path; | |
616 | ||
617 | u = UNIT_DEREF(u->slice); | |
618 | } | |
619 | ||
620 | return NULL; | |
621 | } | |
622 | ||
4ad49000 | 623 | static int unit_create_cgroups(Unit *u, CGroupControllerMask mask) { |
03b90d4b | 624 | _cleanup_free_ char *path = NULL; |
bc432dc7 | 625 | int r; |
64747e2d | 626 | |
4ad49000 | 627 | assert(u); |
64747e2d | 628 | |
4ad49000 LP |
629 | path = unit_default_cgroup_path(u); |
630 | if (!path) | |
a94042fa | 631 | return log_oom(); |
64747e2d | 632 | |
0a1eb06d | 633 | r = hashmap_put(u->manager->cgroup_unit, path, u); |
03b90d4b LP |
634 | if (r < 0) { |
635 | log_error(r == -EEXIST ? "cgroup %s exists already: %s" : "hashmap_put failed for %s: %s", path, strerror(-r)); | |
0a1eb06d | 636 | return r; |
b58b8e11 | 637 | } |
03b90d4b | 638 | if (r > 0) { |
b58b8e11 | 639 | u->cgroup_path = path; |
a94042fa | 640 | path = NULL; |
b58b8e11 HH |
641 | } |
642 | ||
03b90d4b LP |
643 | /* First, create our own group */ |
644 | r = cg_create_everywhere(u->manager->cgroup_supported, mask, u->cgroup_path); | |
645 | if (r < 0) { | |
646 | log_error("Failed to create cgroup %s: %s", u->cgroup_path, strerror(-r)); | |
647 | return r; | |
648 | } | |
649 | ||
650 | /* Keep track that this is now realized */ | |
4ad49000 | 651 | u->cgroup_realized = true; |
bc432dc7 | 652 | u->cgroup_realized_mask = mask; |
4ad49000 | 653 | |
03b90d4b LP |
654 | /* Then, possibly move things over */ |
655 | r = cg_migrate_everywhere(u->manager->cgroup_supported, u->cgroup_path, u->cgroup_path, migrate_callback, u); | |
656 | if (r < 0) | |
657 | log_warning("Failed to migrate cgroup from to %s: %s", u->cgroup_path, strerror(-r)); | |
658 | ||
64747e2d LP |
659 | return 0; |
660 | } | |
661 | ||
6414b7c9 | 662 | static bool unit_has_mask_realized(Unit *u, CGroupControllerMask mask) { |
bc432dc7 LP |
663 | assert(u); |
664 | ||
665 | return u->cgroup_realized && u->cgroup_realized_mask == mask; | |
6414b7c9 DS |
666 | } |
667 | ||
668 | /* Check if necessary controllers and attributes for a unit are in place. | |
669 | * | |
670 | * If so, do nothing. | |
671 | * If not, create paths, move processes over, and set attributes. | |
672 | * | |
673 | * Returns 0 on success and < 0 on failure. */ | |
0a1eb06d | 674 | static int unit_realize_cgroup_now(Unit *u) { |
4ad49000 | 675 | CGroupControllerMask mask; |
6414b7c9 | 676 | int r; |
64747e2d | 677 | |
4ad49000 | 678 | assert(u); |
64747e2d | 679 | |
4ad49000 | 680 | if (u->in_cgroup_queue) { |
71fda00f | 681 | LIST_REMOVE(cgroup_queue, u->manager->cgroup_queue, u); |
4ad49000 LP |
682 | u->in_cgroup_queue = false; |
683 | } | |
64747e2d | 684 | |
6414b7c9 | 685 | mask = unit_get_target_mask(u); |
64747e2d | 686 | |
6414b7c9 | 687 | if (unit_has_mask_realized(u, mask)) |
0a1eb06d | 688 | return 0; |
64747e2d | 689 | |
4ad49000 | 690 | /* First, realize parents */ |
6414b7c9 DS |
691 | if (UNIT_ISSET(u->slice)) { |
692 | r = unit_realize_cgroup_now(UNIT_DEREF(u->slice)); | |
693 | if (r < 0) | |
694 | return r; | |
695 | } | |
4ad49000 LP |
696 | |
697 | /* And then do the real work */ | |
6414b7c9 DS |
698 | r = unit_create_cgroups(u, mask); |
699 | if (r < 0) | |
700 | return r; | |
701 | ||
702 | /* Finally, apply the necessary attributes. */ | |
703 | cgroup_context_apply(unit_get_cgroup_context(u), mask, u->cgroup_path); | |
704 | ||
705 | return 0; | |
64747e2d LP |
706 | } |
707 | ||
4ad49000 | 708 | static void unit_add_to_cgroup_queue(Unit *u) { |
ecedd90f | 709 | |
4ad49000 LP |
710 | if (u->in_cgroup_queue) |
711 | return; | |
8e274523 | 712 | |
71fda00f | 713 | LIST_PREPEND(cgroup_queue, u->manager->cgroup_queue, u); |
4ad49000 LP |
714 | u->in_cgroup_queue = true; |
715 | } | |
8c6db833 | 716 | |
4ad49000 LP |
717 | unsigned manager_dispatch_cgroup_queue(Manager *m) { |
718 | Unit *i; | |
719 | unsigned n = 0; | |
6414b7c9 | 720 | int r; |
ecedd90f | 721 | |
4ad49000 LP |
722 | while ((i = m->cgroup_queue)) { |
723 | assert(i->in_cgroup_queue); | |
ecedd90f | 724 | |
6414b7c9 DS |
725 | r = unit_realize_cgroup_now(i); |
726 | if (r < 0) | |
727 | log_warning("Failed to realize cgroups for queued unit %s: %s", i->id, strerror(-r)); | |
0a1eb06d | 728 | |
4ad49000 LP |
729 | n++; |
730 | } | |
ecedd90f | 731 | |
4ad49000 | 732 | return n; |
8e274523 LP |
733 | } |
734 | ||
4ad49000 LP |
735 | static void unit_queue_siblings(Unit *u) { |
736 | Unit *slice; | |
ca949c9d | 737 | |
4ad49000 LP |
738 | /* This adds the siblings of the specified unit and the |
739 | * siblings of all parent units to the cgroup queue. (But | |
740 | * neither the specified unit itself nor the parents.) */ | |
741 | ||
742 | while ((slice = UNIT_DEREF(u->slice))) { | |
743 | Iterator i; | |
744 | Unit *m; | |
8f53a7b8 | 745 | |
4ad49000 LP |
746 | SET_FOREACH(m, slice->dependencies[UNIT_BEFORE], i) { |
747 | if (m == u) | |
748 | continue; | |
8e274523 | 749 | |
6414b7c9 DS |
750 | /* Skip units that have a dependency on the slice |
751 | * but aren't actually in it. */ | |
4ad49000 | 752 | if (UNIT_DEREF(m->slice) != slice) |
50159e6a | 753 | continue; |
8e274523 | 754 | |
6414b7c9 DS |
755 | /* No point in doing cgroup application for units |
756 | * without active processes. */ | |
757 | if (UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(m))) | |
758 | continue; | |
759 | ||
760 | /* If the unit doesn't need any new controllers | |
761 | * and has current ones realized, it doesn't need | |
762 | * any changes. */ | |
763 | if (unit_has_mask_realized(m, unit_get_target_mask(m))) | |
764 | continue; | |
765 | ||
4ad49000 | 766 | unit_add_to_cgroup_queue(m); |
50159e6a LP |
767 | } |
768 | ||
4ad49000 | 769 | u = slice; |
8e274523 | 770 | } |
4ad49000 LP |
771 | } |
772 | ||
0a1eb06d | 773 | int unit_realize_cgroup(Unit *u) { |
4ad49000 LP |
774 | CGroupContext *c; |
775 | ||
776 | assert(u); | |
777 | ||
778 | c = unit_get_cgroup_context(u); | |
779 | if (!c) | |
0a1eb06d | 780 | return 0; |
8e274523 | 781 | |
4ad49000 LP |
782 | /* So, here's the deal: when realizing the cgroups for this |
783 | * unit, we need to first create all parents, but there's more | |
784 | * actually: for the weight-based controllers we also need to | |
785 | * make sure that all our siblings (i.e. units that are in the | |
73e231ab | 786 | * same slice as we are) have cgroups, too. Otherwise, things |
4ad49000 LP |
787 | * would become very uneven as each of their processes would |
788 | * get as much resources as all our group together. This call | |
789 | * will synchronously create the parent cgroups, but will | |
790 | * defer work on the siblings to the next event loop | |
791 | * iteration. */ | |
ca949c9d | 792 | |
4ad49000 LP |
793 | /* Add all sibling slices to the cgroup queue. */ |
794 | unit_queue_siblings(u); | |
795 | ||
6414b7c9 | 796 | /* And realize this one now (and apply the values) */ |
bc432dc7 | 797 | return unit_realize_cgroup_now(u); |
8e274523 LP |
798 | } |
799 | ||
4ad49000 | 800 | void unit_destroy_cgroup(Unit *u) { |
8e274523 LP |
801 | int r; |
802 | ||
4ad49000 | 803 | assert(u); |
8e274523 | 804 | |
4ad49000 LP |
805 | if (!u->cgroup_path) |
806 | return; | |
8e274523 | 807 | |
13b84ec7 | 808 | r = cg_trim_everywhere(u->manager->cgroup_supported, u->cgroup_path, !unit_has_name(u, SPECIAL_ROOT_SLICE)); |
4ad49000 | 809 | if (r < 0) |
376dd21d | 810 | log_debug("Failed to destroy cgroup %s: %s", u->cgroup_path, strerror(-r)); |
8e274523 | 811 | |
0a1eb06d LP |
812 | hashmap_remove(u->manager->cgroup_unit, u->cgroup_path); |
813 | ||
4ad49000 LP |
814 | free(u->cgroup_path); |
815 | u->cgroup_path = NULL; | |
816 | u->cgroup_realized = false; | |
bc432dc7 | 817 | u->cgroup_realized_mask = 0; |
0a1eb06d | 818 | |
8e274523 LP |
819 | } |
820 | ||
4ad49000 LP |
821 | pid_t unit_search_main_pid(Unit *u) { |
822 | _cleanup_fclose_ FILE *f = NULL; | |
823 | pid_t pid = 0, npid, mypid; | |
824 | ||
825 | assert(u); | |
826 | ||
827 | if (!u->cgroup_path) | |
828 | return 0; | |
829 | ||
830 | if (cg_enumerate_processes(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, &f) < 0) | |
831 | return 0; | |
832 | ||
833 | mypid = getpid(); | |
834 | while (cg_read_pid(f, &npid) > 0) { | |
835 | pid_t ppid; | |
836 | ||
837 | if (npid == pid) | |
838 | continue; | |
8e274523 | 839 | |
4ad49000 LP |
840 | /* Ignore processes that aren't our kids */ |
841 | if (get_parent_of_pid(npid, &ppid) >= 0 && ppid != mypid) | |
842 | continue; | |
8e274523 | 843 | |
4ad49000 LP |
844 | if (pid != 0) { |
845 | /* Dang, there's more than one daemonized PID | |
846 | in this group, so we don't know what process | |
847 | is the main process. */ | |
848 | pid = 0; | |
849 | break; | |
850 | } | |
8e274523 | 851 | |
4ad49000 | 852 | pid = npid; |
8e274523 LP |
853 | } |
854 | ||
4ad49000 | 855 | return pid; |
8e274523 LP |
856 | } |
857 | ||
8e274523 | 858 | int manager_setup_cgroup(Manager *m) { |
9444b1f2 | 859 | _cleanup_free_ char *path = NULL; |
15c60e99 | 860 | char *e; |
8e274523 | 861 | int r; |
8e274523 LP |
862 | |
863 | assert(m); | |
864 | ||
35d2e7ec | 865 | /* 1. Determine hierarchy */ |
9444b1f2 LP |
866 | free(m->cgroup_root); |
867 | m->cgroup_root = NULL; | |
868 | ||
869 | r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 0, &m->cgroup_root); | |
9156e799 | 870 | if (r < 0) { |
12235040 | 871 | log_error("Cannot determine cgroup we are running in: %s", strerror(-r)); |
a32360f1 | 872 | return r; |
12235040 | 873 | } |
8e274523 | 874 | |
15c60e99 LP |
875 | /* LEGACY: Already in /system.slice? If so, let's cut this |
876 | * off. This is to support live upgrades from older systemd | |
877 | * versions where PID 1 was moved there. */ | |
9444b1f2 LP |
878 | if (m->running_as == SYSTEMD_SYSTEM) { |
879 | e = endswith(m->cgroup_root, "/" SPECIAL_SYSTEM_SLICE); | |
15c60e99 LP |
880 | if (!e) |
881 | e = endswith(m->cgroup_root, "/system"); | |
9444b1f2 LP |
882 | if (e) |
883 | *e = 0; | |
0baf24dd | 884 | } |
7ccfb64a | 885 | |
9444b1f2 LP |
886 | /* And make sure to store away the root value without trailing |
887 | * slash, even for the root dir, so that we can easily prepend | |
888 | * it everywhere. */ | |
889 | if (streq(m->cgroup_root, "/")) | |
890 | m->cgroup_root[0] = 0; | |
8e274523 | 891 | |
35d2e7ec | 892 | /* 2. Show data */ |
9444b1f2 | 893 | r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, NULL, &path); |
3474ae3c | 894 | if (r < 0) { |
12235040 | 895 | log_error("Cannot find cgroup mount point: %s", strerror(-r)); |
a32360f1 | 896 | return r; |
12235040 | 897 | } |
8e274523 | 898 | |
c6c18be3 LP |
899 | log_debug("Using cgroup controller " SYSTEMD_CGROUP_CONTROLLER ". File system hierarchy is at %s.", path); |
900 | ||
35d2e7ec | 901 | /* 3. Install agent */ |
a32360f1 LP |
902 | if (m->running_as == SYSTEMD_SYSTEM) { |
903 | r = cg_install_release_agent(SYSTEMD_CGROUP_CONTROLLER, SYSTEMD_CGROUP_AGENT_PATH); | |
904 | if (r < 0) | |
905 | log_warning("Failed to install release agent, ignoring: %s", strerror(-r)); | |
906 | else if (r > 0) | |
907 | log_debug("Installed release agent."); | |
908 | else | |
909 | log_debug("Release agent already installed."); | |
910 | } | |
8e274523 | 911 | |
15c60e99 LP |
912 | /* 4. Make sure we are in the root cgroup */ |
913 | r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, 0); | |
9156e799 | 914 | if (r < 0) { |
8e274523 | 915 | log_error("Failed to create root cgroup hierarchy: %s", strerror(-r)); |
a32360f1 | 916 | return r; |
c6c18be3 LP |
917 | } |
918 | ||
35d2e7ec | 919 | /* 5. And pin it, so that it cannot be unmounted */ |
03e334a1 | 920 | safe_close(m->pin_cgroupfs_fd); |
c6c18be3 | 921 | |
9156e799 LP |
922 | m->pin_cgroupfs_fd = open(path, O_RDONLY|O_CLOEXEC|O_DIRECTORY|O_NOCTTY|O_NONBLOCK); |
923 | if (r < 0) { | |
12235040 | 924 | log_error("Failed to open pin file: %m"); |
a32360f1 | 925 | return -errno; |
c6c18be3 LP |
926 | } |
927 | ||
4ad49000 LP |
928 | /* 6. Figure out which controllers are supported */ |
929 | m->cgroup_supported = cg_mask_supported(); | |
9156e799 | 930 | |
e58cec11 LP |
931 | /* 7. Always enable hierarchial support if it exists... */ |
932 | cg_set_attribute("memory", "/", "memory.use_hierarchy", "1"); | |
933 | ||
a32360f1 | 934 | return 0; |
8e274523 LP |
935 | } |
936 | ||
c6c18be3 | 937 | void manager_shutdown_cgroup(Manager *m, bool delete) { |
8e274523 LP |
938 | assert(m); |
939 | ||
9444b1f2 LP |
940 | /* We can't really delete the group, since we are in it. But |
941 | * let's trim it. */ | |
942 | if (delete && m->cgroup_root) | |
943 | cg_trim(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, false); | |
8e274523 | 944 | |
03e334a1 | 945 | m->pin_cgroupfs_fd = safe_close(m->pin_cgroupfs_fd); |
c6c18be3 | 946 | |
9444b1f2 LP |
947 | free(m->cgroup_root); |
948 | m->cgroup_root = NULL; | |
8e274523 LP |
949 | } |
950 | ||
4ad49000 | 951 | Unit* manager_get_unit_by_cgroup(Manager *m, const char *cgroup) { |
acb14d31 | 952 | char *p; |
4ad49000 | 953 | Unit *u; |
acb14d31 LP |
954 | |
955 | assert(m); | |
956 | assert(cgroup); | |
acb14d31 | 957 | |
4ad49000 LP |
958 | u = hashmap_get(m->cgroup_unit, cgroup); |
959 | if (u) | |
960 | return u; | |
acb14d31 | 961 | |
8e70580b | 962 | p = strdupa(cgroup); |
acb14d31 LP |
963 | for (;;) { |
964 | char *e; | |
965 | ||
966 | e = strrchr(p, '/'); | |
4ad49000 LP |
967 | if (e == p || !e) |
968 | return NULL; | |
acb14d31 LP |
969 | |
970 | *e = 0; | |
971 | ||
4ad49000 LP |
972 | u = hashmap_get(m->cgroup_unit, p); |
973 | if (u) | |
974 | return u; | |
acb14d31 LP |
975 | } |
976 | } | |
977 | ||
4ad49000 LP |
978 | Unit *manager_get_unit_by_pid(Manager *m, pid_t pid) { |
979 | _cleanup_free_ char *cgroup = NULL; | |
acb14d31 | 980 | int r; |
8e274523 | 981 | |
8c47c732 LP |
982 | assert(m); |
983 | ||
984 | if (pid <= 1) | |
985 | return NULL; | |
986 | ||
4ad49000 LP |
987 | r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, pid, &cgroup); |
988 | if (r < 0) | |
6dde1f33 LP |
989 | return NULL; |
990 | ||
4ad49000 | 991 | return manager_get_unit_by_cgroup(m, cgroup); |
6dde1f33 | 992 | } |
4fbf50b3 | 993 | |
4ad49000 LP |
994 | int manager_notify_cgroup_empty(Manager *m, const char *cgroup) { |
995 | Unit *u; | |
996 | int r; | |
4fbf50b3 | 997 | |
4ad49000 LP |
998 | assert(m); |
999 | assert(cgroup); | |
4fbf50b3 | 1000 | |
4ad49000 | 1001 | u = manager_get_unit_by_cgroup(m, cgroup); |
b56c28c3 | 1002 | if (u) { |
06025d91 LP |
1003 | r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, true); |
1004 | if (r > 0) { | |
1005 | if (UNIT_VTABLE(u)->notify_cgroup_empty) | |
1006 | UNIT_VTABLE(u)->notify_cgroup_empty(u); | |
b56c28c3 | 1007 | |
06025d91 LP |
1008 | unit_add_to_gc_queue(u); |
1009 | } | |
b56c28c3 | 1010 | } |
2633eb83 | 1011 | |
4ad49000 | 1012 | return 0; |
4fbf50b3 LP |
1013 | } |
1014 | ||
4ad49000 LP |
1015 | static const char* const cgroup_device_policy_table[_CGROUP_DEVICE_POLICY_MAX] = { |
1016 | [CGROUP_AUTO] = "auto", | |
1017 | [CGROUP_CLOSED] = "closed", | |
1018 | [CGROUP_STRICT] = "strict", | |
1019 | }; | |
4fbf50b3 | 1020 | |
4ad49000 | 1021 | DEFINE_STRING_TABLE_LOOKUP(cgroup_device_policy, CGroupDevicePolicy); |