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Merge pull request #3777 from poettering/id128-rework
[thirdparty/systemd.git] / src / core / cgroup.c
1 /***
2 This file is part of systemd.
3
4 Copyright 2013 Lennart Poettering
5
6 systemd is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as published by
8 the Free Software Foundation; either version 2.1 of the License, or
9 (at your option) any later version.
10
11 systemd is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public License
17 along with systemd; If not, see <http://www.gnu.org/licenses/>.
18 ***/
19
20 #include <fcntl.h>
21 #include <fnmatch.h>
22
23 #include "alloc-util.h"
24 #include "cgroup-util.h"
25 #include "cgroup.h"
26 #include "fd-util.h"
27 #include "fileio.h"
28 #include "fs-util.h"
29 #include "parse-util.h"
30 #include "path-util.h"
31 #include "process-util.h"
32 #include "special.h"
33 #include "string-table.h"
34 #include "string-util.h"
35 #include "stdio-util.h"
36
37 #define CGROUP_CPU_QUOTA_PERIOD_USEC ((usec_t) 100 * USEC_PER_MSEC)
38
39 static void cgroup_compat_warn(void) {
40 static bool cgroup_compat_warned = false;
41
42 if (cgroup_compat_warned)
43 return;
44
45 log_warning("cgroup compatibility translation between legacy and unified hierarchy settings activated. See cgroup-compat debug messages for details.");
46 cgroup_compat_warned = true;
47 }
48
49 #define log_cgroup_compat(unit, fmt, ...) do { \
50 cgroup_compat_warn(); \
51 log_unit_debug(unit, "cgroup-compat: " fmt, ##__VA_ARGS__); \
52 } while (false)
53
54 void cgroup_context_init(CGroupContext *c) {
55 assert(c);
56
57 /* Initialize everything to the kernel defaults, assuming the
58 * structure is preinitialized to 0 */
59
60 c->cpu_shares = CGROUP_CPU_SHARES_INVALID;
61 c->startup_cpu_shares = CGROUP_CPU_SHARES_INVALID;
62 c->cpu_quota_per_sec_usec = USEC_INFINITY;
63
64 c->memory_high = CGROUP_LIMIT_MAX;
65 c->memory_max = CGROUP_LIMIT_MAX;
66
67 c->memory_limit = CGROUP_LIMIT_MAX;
68
69 c->io_weight = CGROUP_WEIGHT_INVALID;
70 c->startup_io_weight = CGROUP_WEIGHT_INVALID;
71
72 c->blockio_weight = CGROUP_BLKIO_WEIGHT_INVALID;
73 c->startup_blockio_weight = CGROUP_BLKIO_WEIGHT_INVALID;
74
75 c->tasks_max = (uint64_t) -1;
76 }
77
78 void cgroup_context_free_device_allow(CGroupContext *c, CGroupDeviceAllow *a) {
79 assert(c);
80 assert(a);
81
82 LIST_REMOVE(device_allow, c->device_allow, a);
83 free(a->path);
84 free(a);
85 }
86
87 void cgroup_context_free_io_device_weight(CGroupContext *c, CGroupIODeviceWeight *w) {
88 assert(c);
89 assert(w);
90
91 LIST_REMOVE(device_weights, c->io_device_weights, w);
92 free(w->path);
93 free(w);
94 }
95
96 void cgroup_context_free_io_device_limit(CGroupContext *c, CGroupIODeviceLimit *l) {
97 assert(c);
98 assert(l);
99
100 LIST_REMOVE(device_limits, c->io_device_limits, l);
101 free(l->path);
102 free(l);
103 }
104
105 void cgroup_context_free_blockio_device_weight(CGroupContext *c, CGroupBlockIODeviceWeight *w) {
106 assert(c);
107 assert(w);
108
109 LIST_REMOVE(device_weights, c->blockio_device_weights, w);
110 free(w->path);
111 free(w);
112 }
113
114 void cgroup_context_free_blockio_device_bandwidth(CGroupContext *c, CGroupBlockIODeviceBandwidth *b) {
115 assert(c);
116 assert(b);
117
118 LIST_REMOVE(device_bandwidths, c->blockio_device_bandwidths, b);
119 free(b->path);
120 free(b);
121 }
122
123 void cgroup_context_done(CGroupContext *c) {
124 assert(c);
125
126 while (c->io_device_weights)
127 cgroup_context_free_io_device_weight(c, c->io_device_weights);
128
129 while (c->io_device_limits)
130 cgroup_context_free_io_device_limit(c, c->io_device_limits);
131
132 while (c->blockio_device_weights)
133 cgroup_context_free_blockio_device_weight(c, c->blockio_device_weights);
134
135 while (c->blockio_device_bandwidths)
136 cgroup_context_free_blockio_device_bandwidth(c, c->blockio_device_bandwidths);
137
138 while (c->device_allow)
139 cgroup_context_free_device_allow(c, c->device_allow);
140 }
141
142 void cgroup_context_dump(CGroupContext *c, FILE* f, const char *prefix) {
143 CGroupIODeviceLimit *il;
144 CGroupIODeviceWeight *iw;
145 CGroupBlockIODeviceBandwidth *b;
146 CGroupBlockIODeviceWeight *w;
147 CGroupDeviceAllow *a;
148 char u[FORMAT_TIMESPAN_MAX];
149
150 assert(c);
151 assert(f);
152
153 prefix = strempty(prefix);
154
155 fprintf(f,
156 "%sCPUAccounting=%s\n"
157 "%sIOAccounting=%s\n"
158 "%sBlockIOAccounting=%s\n"
159 "%sMemoryAccounting=%s\n"
160 "%sTasksAccounting=%s\n"
161 "%sCPUShares=%" PRIu64 "\n"
162 "%sStartupCPUShares=%" PRIu64 "\n"
163 "%sCPUQuotaPerSecSec=%s\n"
164 "%sIOWeight=%" PRIu64 "\n"
165 "%sStartupIOWeight=%" PRIu64 "\n"
166 "%sBlockIOWeight=%" PRIu64 "\n"
167 "%sStartupBlockIOWeight=%" PRIu64 "\n"
168 "%sMemoryLow=%" PRIu64 "\n"
169 "%sMemoryHigh=%" PRIu64 "\n"
170 "%sMemoryMax=%" PRIu64 "\n"
171 "%sMemoryLimit=%" PRIu64 "\n"
172 "%sTasksMax=%" PRIu64 "\n"
173 "%sDevicePolicy=%s\n"
174 "%sDelegate=%s\n",
175 prefix, yes_no(c->cpu_accounting),
176 prefix, yes_no(c->io_accounting),
177 prefix, yes_no(c->blockio_accounting),
178 prefix, yes_no(c->memory_accounting),
179 prefix, yes_no(c->tasks_accounting),
180 prefix, c->cpu_shares,
181 prefix, c->startup_cpu_shares,
182 prefix, format_timespan(u, sizeof(u), c->cpu_quota_per_sec_usec, 1),
183 prefix, c->io_weight,
184 prefix, c->startup_io_weight,
185 prefix, c->blockio_weight,
186 prefix, c->startup_blockio_weight,
187 prefix, c->memory_low,
188 prefix, c->memory_high,
189 prefix, c->memory_max,
190 prefix, c->memory_limit,
191 prefix, c->tasks_max,
192 prefix, cgroup_device_policy_to_string(c->device_policy),
193 prefix, yes_no(c->delegate));
194
195 LIST_FOREACH(device_allow, a, c->device_allow)
196 fprintf(f,
197 "%sDeviceAllow=%s %s%s%s\n",
198 prefix,
199 a->path,
200 a->r ? "r" : "", a->w ? "w" : "", a->m ? "m" : "");
201
202 LIST_FOREACH(device_weights, iw, c->io_device_weights)
203 fprintf(f,
204 "%sIODeviceWeight=%s %" PRIu64,
205 prefix,
206 iw->path,
207 iw->weight);
208
209 LIST_FOREACH(device_limits, il, c->io_device_limits) {
210 char buf[FORMAT_BYTES_MAX];
211 CGroupIOLimitType type;
212
213 for (type = 0; type < _CGROUP_IO_LIMIT_TYPE_MAX; type++)
214 if (il->limits[type] != cgroup_io_limit_defaults[type])
215 fprintf(f,
216 "%s%s=%s %s\n",
217 prefix,
218 cgroup_io_limit_type_to_string(type),
219 il->path,
220 format_bytes(buf, sizeof(buf), il->limits[type]));
221 }
222
223 LIST_FOREACH(device_weights, w, c->blockio_device_weights)
224 fprintf(f,
225 "%sBlockIODeviceWeight=%s %" PRIu64,
226 prefix,
227 w->path,
228 w->weight);
229
230 LIST_FOREACH(device_bandwidths, b, c->blockio_device_bandwidths) {
231 char buf[FORMAT_BYTES_MAX];
232
233 if (b->rbps != CGROUP_LIMIT_MAX)
234 fprintf(f,
235 "%sBlockIOReadBandwidth=%s %s\n",
236 prefix,
237 b->path,
238 format_bytes(buf, sizeof(buf), b->rbps));
239 if (b->wbps != CGROUP_LIMIT_MAX)
240 fprintf(f,
241 "%sBlockIOWriteBandwidth=%s %s\n",
242 prefix,
243 b->path,
244 format_bytes(buf, sizeof(buf), b->wbps));
245 }
246 }
247
248 static int lookup_block_device(const char *p, dev_t *dev) {
249 struct stat st;
250 int r;
251
252 assert(p);
253 assert(dev);
254
255 r = stat(p, &st);
256 if (r < 0)
257 return log_warning_errno(errno, "Couldn't stat device %s: %m", p);
258
259 if (S_ISBLK(st.st_mode))
260 *dev = st.st_rdev;
261 else if (major(st.st_dev) != 0) {
262 /* If this is not a device node then find the block
263 * device this file is stored on */
264 *dev = st.st_dev;
265
266 /* If this is a partition, try to get the originating
267 * block device */
268 block_get_whole_disk(*dev, dev);
269 } else {
270 log_warning("%s is not a block device and file system block device cannot be determined or is not local.", p);
271 return -ENODEV;
272 }
273
274 return 0;
275 }
276
277 static int whitelist_device(const char *path, const char *node, const char *acc) {
278 char buf[2+DECIMAL_STR_MAX(dev_t)*2+2+4];
279 struct stat st;
280 int r;
281
282 assert(path);
283 assert(acc);
284
285 if (stat(node, &st) < 0) {
286 log_warning("Couldn't stat device %s", node);
287 return -errno;
288 }
289
290 if (!S_ISCHR(st.st_mode) && !S_ISBLK(st.st_mode)) {
291 log_warning("%s is not a device.", node);
292 return -ENODEV;
293 }
294
295 sprintf(buf,
296 "%c %u:%u %s",
297 S_ISCHR(st.st_mode) ? 'c' : 'b',
298 major(st.st_rdev), minor(st.st_rdev),
299 acc);
300
301 r = cg_set_attribute("devices", path, "devices.allow", buf);
302 if (r < 0)
303 log_full_errno(IN_SET(r, -ENOENT, -EROFS, -EINVAL, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
304 "Failed to set devices.allow on %s: %m", path);
305
306 return r;
307 }
308
309 static int whitelist_major(const char *path, const char *name, char type, const char *acc) {
310 _cleanup_fclose_ FILE *f = NULL;
311 char line[LINE_MAX];
312 bool good = false;
313 int r;
314
315 assert(path);
316 assert(acc);
317 assert(type == 'b' || type == 'c');
318
319 f = fopen("/proc/devices", "re");
320 if (!f)
321 return log_warning_errno(errno, "Cannot open /proc/devices to resolve %s (%c): %m", name, type);
322
323 FOREACH_LINE(line, f, goto fail) {
324 char buf[2+DECIMAL_STR_MAX(unsigned)+3+4], *p, *w;
325 unsigned maj;
326
327 truncate_nl(line);
328
329 if (type == 'c' && streq(line, "Character devices:")) {
330 good = true;
331 continue;
332 }
333
334 if (type == 'b' && streq(line, "Block devices:")) {
335 good = true;
336 continue;
337 }
338
339 if (isempty(line)) {
340 good = false;
341 continue;
342 }
343
344 if (!good)
345 continue;
346
347 p = strstrip(line);
348
349 w = strpbrk(p, WHITESPACE);
350 if (!w)
351 continue;
352 *w = 0;
353
354 r = safe_atou(p, &maj);
355 if (r < 0)
356 continue;
357 if (maj <= 0)
358 continue;
359
360 w++;
361 w += strspn(w, WHITESPACE);
362
363 if (fnmatch(name, w, 0) != 0)
364 continue;
365
366 sprintf(buf,
367 "%c %u:* %s",
368 type,
369 maj,
370 acc);
371
372 r = cg_set_attribute("devices", path, "devices.allow", buf);
373 if (r < 0)
374 log_full_errno(IN_SET(r, -ENOENT, -EROFS, -EINVAL, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
375 "Failed to set devices.allow on %s: %m", path);
376 }
377
378 return 0;
379
380 fail:
381 log_warning_errno(errno, "Failed to read /proc/devices: %m");
382 return -errno;
383 }
384
385 static bool cgroup_context_has_io_config(CGroupContext *c) {
386 return c->io_accounting ||
387 c->io_weight != CGROUP_WEIGHT_INVALID ||
388 c->startup_io_weight != CGROUP_WEIGHT_INVALID ||
389 c->io_device_weights ||
390 c->io_device_limits;
391 }
392
393 static bool cgroup_context_has_blockio_config(CGroupContext *c) {
394 return c->blockio_accounting ||
395 c->blockio_weight != CGROUP_BLKIO_WEIGHT_INVALID ||
396 c->startup_blockio_weight != CGROUP_BLKIO_WEIGHT_INVALID ||
397 c->blockio_device_weights ||
398 c->blockio_device_bandwidths;
399 }
400
401 static uint64_t cgroup_context_io_weight(CGroupContext *c, ManagerState state) {
402 if (IN_SET(state, MANAGER_STARTING, MANAGER_INITIALIZING) &&
403 c->startup_io_weight != CGROUP_WEIGHT_INVALID)
404 return c->startup_io_weight;
405 else if (c->io_weight != CGROUP_WEIGHT_INVALID)
406 return c->io_weight;
407 else
408 return CGROUP_WEIGHT_DEFAULT;
409 }
410
411 static uint64_t cgroup_context_blkio_weight(CGroupContext *c, ManagerState state) {
412 if (IN_SET(state, MANAGER_STARTING, MANAGER_INITIALIZING) &&
413 c->startup_blockio_weight != CGROUP_BLKIO_WEIGHT_INVALID)
414 return c->startup_blockio_weight;
415 else if (c->blockio_weight != CGROUP_BLKIO_WEIGHT_INVALID)
416 return c->blockio_weight;
417 else
418 return CGROUP_BLKIO_WEIGHT_DEFAULT;
419 }
420
421 static uint64_t cgroup_weight_blkio_to_io(uint64_t blkio_weight) {
422 return CLAMP(blkio_weight * CGROUP_WEIGHT_DEFAULT / CGROUP_BLKIO_WEIGHT_DEFAULT,
423 CGROUP_WEIGHT_MIN, CGROUP_WEIGHT_MAX);
424 }
425
426 static uint64_t cgroup_weight_io_to_blkio(uint64_t io_weight) {
427 return CLAMP(io_weight * CGROUP_BLKIO_WEIGHT_DEFAULT / CGROUP_WEIGHT_DEFAULT,
428 CGROUP_BLKIO_WEIGHT_MIN, CGROUP_BLKIO_WEIGHT_MAX);
429 }
430
431 static void cgroup_apply_io_device_weight(Unit *u, const char *dev_path, uint64_t io_weight) {
432 char buf[DECIMAL_STR_MAX(dev_t)*2+2+DECIMAL_STR_MAX(uint64_t)+1];
433 dev_t dev;
434 int r;
435
436 r = lookup_block_device(dev_path, &dev);
437 if (r < 0)
438 return;
439
440 xsprintf(buf, "%u:%u %" PRIu64 "\n", major(dev), minor(dev), io_weight);
441 r = cg_set_attribute("io", u->cgroup_path, "io.weight", buf);
442 if (r < 0)
443 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
444 "Failed to set io.weight: %m");
445 }
446
447 static void cgroup_apply_blkio_device_weight(Unit *u, const char *dev_path, uint64_t blkio_weight) {
448 char buf[DECIMAL_STR_MAX(dev_t)*2+2+DECIMAL_STR_MAX(uint64_t)+1];
449 dev_t dev;
450 int r;
451
452 r = lookup_block_device(dev_path, &dev);
453 if (r < 0)
454 return;
455
456 xsprintf(buf, "%u:%u %" PRIu64 "\n", major(dev), minor(dev), blkio_weight);
457 r = cg_set_attribute("blkio", u->cgroup_path, "blkio.weight_device", buf);
458 if (r < 0)
459 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
460 "Failed to set blkio.weight_device: %m");
461 }
462
463 static unsigned cgroup_apply_io_device_limit(Unit *u, const char *dev_path, uint64_t *limits) {
464 char limit_bufs[_CGROUP_IO_LIMIT_TYPE_MAX][DECIMAL_STR_MAX(uint64_t)];
465 char buf[DECIMAL_STR_MAX(dev_t)*2+2+(6+DECIMAL_STR_MAX(uint64_t)+1)*4];
466 CGroupIOLimitType type;
467 dev_t dev;
468 unsigned n = 0;
469 int r;
470
471 r = lookup_block_device(dev_path, &dev);
472 if (r < 0)
473 return 0;
474
475 for (type = 0; type < _CGROUP_IO_LIMIT_TYPE_MAX; type++) {
476 if (limits[type] != cgroup_io_limit_defaults[type]) {
477 xsprintf(limit_bufs[type], "%" PRIu64, limits[type]);
478 n++;
479 } else {
480 xsprintf(limit_bufs[type], "%s", limits[type] == CGROUP_LIMIT_MAX ? "max" : "0");
481 }
482 }
483
484 xsprintf(buf, "%u:%u rbps=%s wbps=%s riops=%s wiops=%s\n", major(dev), minor(dev),
485 limit_bufs[CGROUP_IO_RBPS_MAX], limit_bufs[CGROUP_IO_WBPS_MAX],
486 limit_bufs[CGROUP_IO_RIOPS_MAX], limit_bufs[CGROUP_IO_WIOPS_MAX]);
487 r = cg_set_attribute("io", u->cgroup_path, "io.max", buf);
488 if (r < 0)
489 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
490 "Failed to set io.max: %m");
491 return n;
492 }
493
494 static unsigned cgroup_apply_blkio_device_limit(Unit *u, const char *dev_path, uint64_t rbps, uint64_t wbps) {
495 char buf[DECIMAL_STR_MAX(dev_t)*2+2+DECIMAL_STR_MAX(uint64_t)+1];
496 dev_t dev;
497 unsigned n = 0;
498 int r;
499
500 r = lookup_block_device(dev_path, &dev);
501 if (r < 0)
502 return 0;
503
504 if (rbps != CGROUP_LIMIT_MAX)
505 n++;
506 sprintf(buf, "%u:%u %" PRIu64 "\n", major(dev), minor(dev), rbps);
507 r = cg_set_attribute("blkio", u->cgroup_path, "blkio.throttle.read_bps_device", buf);
508 if (r < 0)
509 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
510 "Failed to set blkio.throttle.read_bps_device: %m");
511
512 if (wbps != CGROUP_LIMIT_MAX)
513 n++;
514 sprintf(buf, "%u:%u %" PRIu64 "\n", major(dev), minor(dev), wbps);
515 r = cg_set_attribute("blkio", u->cgroup_path, "blkio.throttle.write_bps_device", buf);
516 if (r < 0)
517 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
518 "Failed to set blkio.throttle.write_bps_device: %m");
519
520 return n;
521 }
522
523 static bool cgroup_context_has_unified_memory_config(CGroupContext *c) {
524 return c->memory_low > 0 || c->memory_high != CGROUP_LIMIT_MAX || c->memory_max != CGROUP_LIMIT_MAX;
525 }
526
527 static void cgroup_apply_unified_memory_limit(Unit *u, const char *file, uint64_t v) {
528 char buf[DECIMAL_STR_MAX(uint64_t) + 1] = "max";
529 int r;
530
531 if (v != CGROUP_LIMIT_MAX)
532 xsprintf(buf, "%" PRIu64 "\n", v);
533
534 r = cg_set_attribute("memory", u->cgroup_path, file, buf);
535 if (r < 0)
536 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
537 "Failed to set %s: %m", file);
538 }
539
540 static void cgroup_context_apply(Unit *u, CGroupMask mask, ManagerState state) {
541 const char *path;
542 CGroupContext *c;
543 bool is_root;
544 int r;
545
546 assert(u);
547
548 c = unit_get_cgroup_context(u);
549 path = u->cgroup_path;
550
551 assert(c);
552 assert(path);
553
554 if (mask == 0)
555 return;
556
557 /* Some cgroup attributes are not supported on the root cgroup,
558 * hence silently ignore */
559 is_root = isempty(path) || path_equal(path, "/");
560 if (is_root)
561 /* Make sure we don't try to display messages with an empty path. */
562 path = "/";
563
564 /* We generally ignore errors caused by read-only mounted
565 * cgroup trees (assuming we are running in a container then),
566 * and missing cgroups, i.e. EROFS and ENOENT. */
567
568 if ((mask & CGROUP_MASK_CPU) && !is_root) {
569 char buf[MAX(DECIMAL_STR_MAX(uint64_t), DECIMAL_STR_MAX(usec_t)) + 1];
570
571 sprintf(buf, "%" PRIu64 "\n",
572 IN_SET(state, MANAGER_STARTING, MANAGER_INITIALIZING) && c->startup_cpu_shares != CGROUP_CPU_SHARES_INVALID ? c->startup_cpu_shares :
573 c->cpu_shares != CGROUP_CPU_SHARES_INVALID ? c->cpu_shares : CGROUP_CPU_SHARES_DEFAULT);
574 r = cg_set_attribute("cpu", path, "cpu.shares", buf);
575 if (r < 0)
576 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
577 "Failed to set cpu.shares: %m");
578
579 sprintf(buf, USEC_FMT "\n", CGROUP_CPU_QUOTA_PERIOD_USEC);
580 r = cg_set_attribute("cpu", path, "cpu.cfs_period_us", buf);
581 if (r < 0)
582 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
583 "Failed to set cpu.cfs_period_us: %m");
584
585 if (c->cpu_quota_per_sec_usec != USEC_INFINITY) {
586 sprintf(buf, USEC_FMT "\n", c->cpu_quota_per_sec_usec * CGROUP_CPU_QUOTA_PERIOD_USEC / USEC_PER_SEC);
587 r = cg_set_attribute("cpu", path, "cpu.cfs_quota_us", buf);
588 } else
589 r = cg_set_attribute("cpu", path, "cpu.cfs_quota_us", "-1");
590 if (r < 0)
591 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
592 "Failed to set cpu.cfs_quota_us: %m");
593 }
594
595 if (mask & CGROUP_MASK_IO) {
596 bool has_io = cgroup_context_has_io_config(c);
597 bool has_blockio = cgroup_context_has_blockio_config(c);
598
599 if (!is_root) {
600 char buf[8+DECIMAL_STR_MAX(uint64_t)+1];
601 uint64_t weight;
602
603 if (has_io)
604 weight = cgroup_context_io_weight(c, state);
605 else if (has_blockio) {
606 uint64_t blkio_weight = cgroup_context_blkio_weight(c, state);
607
608 weight = cgroup_weight_blkio_to_io(blkio_weight);
609
610 log_cgroup_compat(u, "Applying [Startup]BlockIOWeight %" PRIu64 " as [Startup]IOWeight %" PRIu64,
611 blkio_weight, weight);
612 } else
613 weight = CGROUP_WEIGHT_DEFAULT;
614
615 xsprintf(buf, "default %" PRIu64 "\n", weight);
616 r = cg_set_attribute("io", path, "io.weight", buf);
617 if (r < 0)
618 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
619 "Failed to set io.weight: %m");
620
621 if (has_io) {
622 CGroupIODeviceWeight *w;
623
624 /* FIXME: no way to reset this list */
625 LIST_FOREACH(device_weights, w, c->io_device_weights)
626 cgroup_apply_io_device_weight(u, w->path, w->weight);
627 } else if (has_blockio) {
628 CGroupBlockIODeviceWeight *w;
629
630 /* FIXME: no way to reset this list */
631 LIST_FOREACH(device_weights, w, c->blockio_device_weights) {
632 weight = cgroup_weight_blkio_to_io(w->weight);
633
634 log_cgroup_compat(u, "Applying BlockIODeviceWeight %" PRIu64 " as IODeviceWeight %" PRIu64 " for %s",
635 w->weight, weight, w->path);
636
637 cgroup_apply_io_device_weight(u, w->path, weight);
638 }
639 }
640 }
641
642 /* Apply limits and free ones without config. */
643 if (has_io) {
644 CGroupIODeviceLimit *l, *next;
645
646 LIST_FOREACH_SAFE(device_limits, l, next, c->io_device_limits) {
647 if (!cgroup_apply_io_device_limit(u, l->path, l->limits))
648 cgroup_context_free_io_device_limit(c, l);
649 }
650 } else if (has_blockio) {
651 CGroupBlockIODeviceBandwidth *b, *next;
652
653 LIST_FOREACH_SAFE(device_bandwidths, b, next, c->blockio_device_bandwidths) {
654 uint64_t limits[_CGROUP_IO_LIMIT_TYPE_MAX];
655 CGroupIOLimitType type;
656
657 for (type = 0; type < _CGROUP_IO_LIMIT_TYPE_MAX; type++)
658 limits[type] = cgroup_io_limit_defaults[type];
659
660 limits[CGROUP_IO_RBPS_MAX] = b->rbps;
661 limits[CGROUP_IO_WBPS_MAX] = b->wbps;
662
663 log_cgroup_compat(u, "Applying BlockIO{Read|Write}Bandwidth %" PRIu64 " %" PRIu64 " as IO{Read|Write}BandwidthMax for %s",
664 b->rbps, b->wbps, b->path);
665
666 if (!cgroup_apply_io_device_limit(u, b->path, limits))
667 cgroup_context_free_blockio_device_bandwidth(c, b);
668 }
669 }
670 }
671
672 if (mask & CGROUP_MASK_BLKIO) {
673 bool has_io = cgroup_context_has_io_config(c);
674 bool has_blockio = cgroup_context_has_blockio_config(c);
675
676 if (!is_root) {
677 char buf[DECIMAL_STR_MAX(uint64_t)+1];
678 uint64_t weight;
679
680 if (has_blockio)
681 weight = cgroup_context_blkio_weight(c, state);
682 else if (has_io) {
683 uint64_t io_weight = cgroup_context_io_weight(c, state);
684
685 weight = cgroup_weight_io_to_blkio(cgroup_context_io_weight(c, state));
686
687 log_cgroup_compat(u, "Applying [Startup]IOWeight %" PRIu64 " as [Startup]BlockIOWeight %" PRIu64,
688 io_weight, weight);
689 } else
690 weight = CGROUP_BLKIO_WEIGHT_DEFAULT;
691
692 xsprintf(buf, "%" PRIu64 "\n", weight);
693 r = cg_set_attribute("blkio", path, "blkio.weight", buf);
694 if (r < 0)
695 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
696 "Failed to set blkio.weight: %m");
697
698 if (has_blockio) {
699 CGroupBlockIODeviceWeight *w;
700
701 /* FIXME: no way to reset this list */
702 LIST_FOREACH(device_weights, w, c->blockio_device_weights)
703 cgroup_apply_blkio_device_weight(u, w->path, w->weight);
704 } else if (has_io) {
705 CGroupIODeviceWeight *w;
706
707 /* FIXME: no way to reset this list */
708 LIST_FOREACH(device_weights, w, c->io_device_weights) {
709 weight = cgroup_weight_io_to_blkio(w->weight);
710
711 log_cgroup_compat(u, "Applying IODeviceWeight %" PRIu64 " as BlockIODeviceWeight %" PRIu64 " for %s",
712 w->weight, weight, w->path);
713
714 cgroup_apply_blkio_device_weight(u, w->path, weight);
715 }
716 }
717 }
718
719 /* Apply limits and free ones without config. */
720 if (has_blockio) {
721 CGroupBlockIODeviceBandwidth *b, *next;
722
723 LIST_FOREACH_SAFE(device_bandwidths, b, next, c->blockio_device_bandwidths) {
724 if (!cgroup_apply_blkio_device_limit(u, b->path, b->rbps, b->wbps))
725 cgroup_context_free_blockio_device_bandwidth(c, b);
726 }
727 } else if (has_io) {
728 CGroupIODeviceLimit *l, *next;
729
730 LIST_FOREACH_SAFE(device_limits, l, next, c->io_device_limits) {
731 log_cgroup_compat(u, "Applying IO{Read|Write}Bandwidth %" PRIu64 " %" PRIu64 " as BlockIO{Read|Write}BandwidthMax for %s",
732 l->limits[CGROUP_IO_RBPS_MAX], l->limits[CGROUP_IO_WBPS_MAX], l->path);
733
734 if (!cgroup_apply_blkio_device_limit(u, l->path, l->limits[CGROUP_IO_RBPS_MAX], l->limits[CGROUP_IO_WBPS_MAX]))
735 cgroup_context_free_io_device_limit(c, l);
736 }
737 }
738 }
739
740 if ((mask & CGROUP_MASK_MEMORY) && !is_root) {
741 if (cg_unified() > 0) {
742 uint64_t max = c->memory_max;
743
744 if (cgroup_context_has_unified_memory_config(c))
745 max = c->memory_max;
746 else {
747 max = c->memory_limit;
748
749 if (max != CGROUP_LIMIT_MAX)
750 log_cgroup_compat(u, "Applying MemoryLimit %" PRIu64 " as MemoryMax", max);
751 }
752
753 cgroup_apply_unified_memory_limit(u, "memory.low", c->memory_low);
754 cgroup_apply_unified_memory_limit(u, "memory.high", c->memory_high);
755 cgroup_apply_unified_memory_limit(u, "memory.max", max);
756 } else {
757 char buf[DECIMAL_STR_MAX(uint64_t) + 1];
758 uint64_t val = c->memory_limit;
759
760 if (val == CGROUP_LIMIT_MAX) {
761 val = c->memory_max;
762
763 if (val != CGROUP_LIMIT_MAX)
764 log_cgroup_compat(u, "Applying MemoryMax %" PRIi64 " as MemoryLimit", c->memory_max);
765 }
766
767 if (val == CGROUP_LIMIT_MAX)
768 strncpy(buf, "-1\n", sizeof(buf));
769 else
770 xsprintf(buf, "%" PRIu64 "\n", val);
771
772 r = cg_set_attribute("memory", path, "memory.limit_in_bytes", buf);
773 if (r < 0)
774 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
775 "Failed to set memory.limit_in_bytes: %m");
776 }
777 }
778
779 if ((mask & CGROUP_MASK_DEVICES) && !is_root) {
780 CGroupDeviceAllow *a;
781
782 /* Changing the devices list of a populated cgroup
783 * might result in EINVAL, hence ignore EINVAL
784 * here. */
785
786 if (c->device_allow || c->device_policy != CGROUP_AUTO)
787 r = cg_set_attribute("devices", path, "devices.deny", "a");
788 else
789 r = cg_set_attribute("devices", path, "devices.allow", "a");
790 if (r < 0)
791 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EINVAL, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
792 "Failed to reset devices.list: %m");
793
794 if (c->device_policy == CGROUP_CLOSED ||
795 (c->device_policy == CGROUP_AUTO && c->device_allow)) {
796 static const char auto_devices[] =
797 "/dev/null\0" "rwm\0"
798 "/dev/zero\0" "rwm\0"
799 "/dev/full\0" "rwm\0"
800 "/dev/random\0" "rwm\0"
801 "/dev/urandom\0" "rwm\0"
802 "/dev/tty\0" "rwm\0"
803 "/dev/pts/ptmx\0" "rw\0" /* /dev/pts/ptmx may not be duplicated, but accessed */
804 /* Allow /run/systemd/inaccessible/{chr,blk} devices for mapping InaccessiblePaths */
805 "/run/systemd/inaccessible/chr\0" "rwm\0"
806 "/run/systemd/inaccessible/blk\0" "rwm\0";
807
808 const char *x, *y;
809
810 NULSTR_FOREACH_PAIR(x, y, auto_devices)
811 whitelist_device(path, x, y);
812
813 whitelist_major(path, "pts", 'c', "rw");
814 whitelist_major(path, "kdbus", 'c', "rw");
815 whitelist_major(path, "kdbus/*", 'c', "rw");
816 }
817
818 LIST_FOREACH(device_allow, a, c->device_allow) {
819 char acc[4];
820 unsigned k = 0;
821
822 if (a->r)
823 acc[k++] = 'r';
824 if (a->w)
825 acc[k++] = 'w';
826 if (a->m)
827 acc[k++] = 'm';
828
829 if (k == 0)
830 continue;
831
832 acc[k++] = 0;
833
834 if (startswith(a->path, "/dev/"))
835 whitelist_device(path, a->path, acc);
836 else if (startswith(a->path, "block-"))
837 whitelist_major(path, a->path + 6, 'b', acc);
838 else if (startswith(a->path, "char-"))
839 whitelist_major(path, a->path + 5, 'c', acc);
840 else
841 log_unit_debug(u, "Ignoring device %s while writing cgroup attribute.", a->path);
842 }
843 }
844
845 if ((mask & CGROUP_MASK_PIDS) && !is_root) {
846
847 if (c->tasks_max != (uint64_t) -1) {
848 char buf[DECIMAL_STR_MAX(uint64_t) + 2];
849
850 sprintf(buf, "%" PRIu64 "\n", c->tasks_max);
851 r = cg_set_attribute("pids", path, "pids.max", buf);
852 } else
853 r = cg_set_attribute("pids", path, "pids.max", "max");
854
855 if (r < 0)
856 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
857 "Failed to set pids.max: %m");
858 }
859 }
860
861 CGroupMask cgroup_context_get_mask(CGroupContext *c) {
862 CGroupMask mask = 0;
863
864 /* Figure out which controllers we need */
865
866 if (c->cpu_accounting ||
867 c->cpu_shares != CGROUP_CPU_SHARES_INVALID ||
868 c->startup_cpu_shares != CGROUP_CPU_SHARES_INVALID ||
869 c->cpu_quota_per_sec_usec != USEC_INFINITY)
870 mask |= CGROUP_MASK_CPUACCT | CGROUP_MASK_CPU;
871
872 if (cgroup_context_has_io_config(c) || cgroup_context_has_blockio_config(c))
873 mask |= CGROUP_MASK_IO | CGROUP_MASK_BLKIO;
874
875 if (c->memory_accounting ||
876 c->memory_limit != CGROUP_LIMIT_MAX ||
877 cgroup_context_has_unified_memory_config(c))
878 mask |= CGROUP_MASK_MEMORY;
879
880 if (c->device_allow ||
881 c->device_policy != CGROUP_AUTO)
882 mask |= CGROUP_MASK_DEVICES;
883
884 if (c->tasks_accounting ||
885 c->tasks_max != (uint64_t) -1)
886 mask |= CGROUP_MASK_PIDS;
887
888 return mask;
889 }
890
891 CGroupMask unit_get_own_mask(Unit *u) {
892 CGroupContext *c;
893
894 /* Returns the mask of controllers the unit needs for itself */
895
896 c = unit_get_cgroup_context(u);
897 if (!c)
898 return 0;
899
900 /* If delegation is turned on, then turn on all cgroups,
901 * unless we are on the legacy hierarchy and the process we
902 * fork into it is known to drop privileges, and hence
903 * shouldn't get access to the controllers.
904 *
905 * Note that on the unified hierarchy it is safe to delegate
906 * controllers to unprivileged services. */
907
908 if (c->delegate) {
909 ExecContext *e;
910
911 e = unit_get_exec_context(u);
912 if (!e ||
913 exec_context_maintains_privileges(e) ||
914 cg_unified() > 0)
915 return _CGROUP_MASK_ALL;
916 }
917
918 return cgroup_context_get_mask(c);
919 }
920
921 CGroupMask unit_get_members_mask(Unit *u) {
922 assert(u);
923
924 /* Returns the mask of controllers all of the unit's children
925 * require, merged */
926
927 if (u->cgroup_members_mask_valid)
928 return u->cgroup_members_mask;
929
930 u->cgroup_members_mask = 0;
931
932 if (u->type == UNIT_SLICE) {
933 Unit *member;
934 Iterator i;
935
936 SET_FOREACH(member, u->dependencies[UNIT_BEFORE], i) {
937
938 if (member == u)
939 continue;
940
941 if (UNIT_DEREF(member->slice) != u)
942 continue;
943
944 u->cgroup_members_mask |=
945 unit_get_own_mask(member) |
946 unit_get_members_mask(member);
947 }
948 }
949
950 u->cgroup_members_mask_valid = true;
951 return u->cgroup_members_mask;
952 }
953
954 CGroupMask unit_get_siblings_mask(Unit *u) {
955 assert(u);
956
957 /* Returns the mask of controllers all of the unit's siblings
958 * require, i.e. the members mask of the unit's parent slice
959 * if there is one. */
960
961 if (UNIT_ISSET(u->slice))
962 return unit_get_members_mask(UNIT_DEREF(u->slice));
963
964 return unit_get_own_mask(u) | unit_get_members_mask(u);
965 }
966
967 CGroupMask unit_get_subtree_mask(Unit *u) {
968
969 /* Returns the mask of this subtree, meaning of the group
970 * itself and its children. */
971
972 return unit_get_own_mask(u) | unit_get_members_mask(u);
973 }
974
975 CGroupMask unit_get_target_mask(Unit *u) {
976 CGroupMask mask;
977
978 /* This returns the cgroup mask of all controllers to enable
979 * for a specific cgroup, i.e. everything it needs itself,
980 * plus all that its children need, plus all that its siblings
981 * need. This is primarily useful on the legacy cgroup
982 * hierarchy, where we need to duplicate each cgroup in each
983 * hierarchy that shall be enabled for it. */
984
985 mask = unit_get_own_mask(u) | unit_get_members_mask(u) | unit_get_siblings_mask(u);
986 mask &= u->manager->cgroup_supported;
987
988 return mask;
989 }
990
991 CGroupMask unit_get_enable_mask(Unit *u) {
992 CGroupMask mask;
993
994 /* This returns the cgroup mask of all controllers to enable
995 * for the children of a specific cgroup. This is primarily
996 * useful for the unified cgroup hierarchy, where each cgroup
997 * controls which controllers are enabled for its children. */
998
999 mask = unit_get_members_mask(u);
1000 mask &= u->manager->cgroup_supported;
1001
1002 return mask;
1003 }
1004
1005 /* Recurse from a unit up through its containing slices, propagating
1006 * mask bits upward. A unit is also member of itself. */
1007 void unit_update_cgroup_members_masks(Unit *u) {
1008 CGroupMask m;
1009 bool more;
1010
1011 assert(u);
1012
1013 /* Calculate subtree mask */
1014 m = unit_get_subtree_mask(u);
1015
1016 /* See if anything changed from the previous invocation. If
1017 * not, we're done. */
1018 if (u->cgroup_subtree_mask_valid && m == u->cgroup_subtree_mask)
1019 return;
1020
1021 more =
1022 u->cgroup_subtree_mask_valid &&
1023 ((m & ~u->cgroup_subtree_mask) != 0) &&
1024 ((~m & u->cgroup_subtree_mask) == 0);
1025
1026 u->cgroup_subtree_mask = m;
1027 u->cgroup_subtree_mask_valid = true;
1028
1029 if (UNIT_ISSET(u->slice)) {
1030 Unit *s = UNIT_DEREF(u->slice);
1031
1032 if (more)
1033 /* There's more set now than before. We
1034 * propagate the new mask to the parent's mask
1035 * (not caring if it actually was valid or
1036 * not). */
1037
1038 s->cgroup_members_mask |= m;
1039
1040 else
1041 /* There's less set now than before (or we
1042 * don't know), we need to recalculate
1043 * everything, so let's invalidate the
1044 * parent's members mask */
1045
1046 s->cgroup_members_mask_valid = false;
1047
1048 /* And now make sure that this change also hits our
1049 * grandparents */
1050 unit_update_cgroup_members_masks(s);
1051 }
1052 }
1053
1054 static const char *migrate_callback(CGroupMask mask, void *userdata) {
1055 Unit *u = userdata;
1056
1057 assert(mask != 0);
1058 assert(u);
1059
1060 while (u) {
1061 if (u->cgroup_path &&
1062 u->cgroup_realized &&
1063 (u->cgroup_realized_mask & mask) == mask)
1064 return u->cgroup_path;
1065
1066 u = UNIT_DEREF(u->slice);
1067 }
1068
1069 return NULL;
1070 }
1071
1072 char *unit_default_cgroup_path(Unit *u) {
1073 _cleanup_free_ char *escaped = NULL, *slice = NULL;
1074 int r;
1075
1076 assert(u);
1077
1078 if (unit_has_name(u, SPECIAL_ROOT_SLICE))
1079 return strdup(u->manager->cgroup_root);
1080
1081 if (UNIT_ISSET(u->slice) && !unit_has_name(UNIT_DEREF(u->slice), SPECIAL_ROOT_SLICE)) {
1082 r = cg_slice_to_path(UNIT_DEREF(u->slice)->id, &slice);
1083 if (r < 0)
1084 return NULL;
1085 }
1086
1087 escaped = cg_escape(u->id);
1088 if (!escaped)
1089 return NULL;
1090
1091 if (slice)
1092 return strjoin(u->manager->cgroup_root, "/", slice, "/", escaped, NULL);
1093 else
1094 return strjoin(u->manager->cgroup_root, "/", escaped, NULL);
1095 }
1096
1097 int unit_set_cgroup_path(Unit *u, const char *path) {
1098 _cleanup_free_ char *p = NULL;
1099 int r;
1100
1101 assert(u);
1102
1103 if (path) {
1104 p = strdup(path);
1105 if (!p)
1106 return -ENOMEM;
1107 } else
1108 p = NULL;
1109
1110 if (streq_ptr(u->cgroup_path, p))
1111 return 0;
1112
1113 if (p) {
1114 r = hashmap_put(u->manager->cgroup_unit, p, u);
1115 if (r < 0)
1116 return r;
1117 }
1118
1119 unit_release_cgroup(u);
1120
1121 u->cgroup_path = p;
1122 p = NULL;
1123
1124 return 1;
1125 }
1126
1127 int unit_watch_cgroup(Unit *u) {
1128 _cleanup_free_ char *events = NULL;
1129 int r;
1130
1131 assert(u);
1132
1133 if (!u->cgroup_path)
1134 return 0;
1135
1136 if (u->cgroup_inotify_wd >= 0)
1137 return 0;
1138
1139 /* Only applies to the unified hierarchy */
1140 r = cg_unified();
1141 if (r < 0)
1142 return log_unit_error_errno(u, r, "Failed detect whether the unified hierarchy is used: %m");
1143 if (r == 0)
1144 return 0;
1145
1146 /* Don't watch the root slice, it's pointless. */
1147 if (unit_has_name(u, SPECIAL_ROOT_SLICE))
1148 return 0;
1149
1150 r = hashmap_ensure_allocated(&u->manager->cgroup_inotify_wd_unit, &trivial_hash_ops);
1151 if (r < 0)
1152 return log_oom();
1153
1154 r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, "cgroup.events", &events);
1155 if (r < 0)
1156 return log_oom();
1157
1158 u->cgroup_inotify_wd = inotify_add_watch(u->manager->cgroup_inotify_fd, events, IN_MODIFY);
1159 if (u->cgroup_inotify_wd < 0) {
1160
1161 if (errno == ENOENT) /* If the directory is already
1162 * gone we don't need to track
1163 * it, so this is not an error */
1164 return 0;
1165
1166 return log_unit_error_errno(u, errno, "Failed to add inotify watch descriptor for control group %s: %m", u->cgroup_path);
1167 }
1168
1169 r = hashmap_put(u->manager->cgroup_inotify_wd_unit, INT_TO_PTR(u->cgroup_inotify_wd), u);
1170 if (r < 0)
1171 return log_unit_error_errno(u, r, "Failed to add inotify watch descriptor to hash map: %m");
1172
1173 return 0;
1174 }
1175
1176 static int unit_create_cgroup(
1177 Unit *u,
1178 CGroupMask target_mask,
1179 CGroupMask enable_mask) {
1180
1181 CGroupContext *c;
1182 int r;
1183
1184 assert(u);
1185
1186 c = unit_get_cgroup_context(u);
1187 if (!c)
1188 return 0;
1189
1190 if (!u->cgroup_path) {
1191 _cleanup_free_ char *path = NULL;
1192
1193 path = unit_default_cgroup_path(u);
1194 if (!path)
1195 return log_oom();
1196
1197 r = unit_set_cgroup_path(u, path);
1198 if (r == -EEXIST)
1199 return log_unit_error_errno(u, r, "Control group %s exists already.", path);
1200 if (r < 0)
1201 return log_unit_error_errno(u, r, "Failed to set unit's control group path to %s: %m", path);
1202 }
1203
1204 /* First, create our own group */
1205 r = cg_create_everywhere(u->manager->cgroup_supported, target_mask, u->cgroup_path);
1206 if (r < 0)
1207 return log_unit_error_errno(u, r, "Failed to create cgroup %s: %m", u->cgroup_path);
1208
1209 /* Start watching it */
1210 (void) unit_watch_cgroup(u);
1211
1212 /* Enable all controllers we need */
1213 r = cg_enable_everywhere(u->manager->cgroup_supported, enable_mask, u->cgroup_path);
1214 if (r < 0)
1215 log_unit_warning_errno(u, r, "Failed to enable controllers on cgroup %s, ignoring: %m", u->cgroup_path);
1216
1217 /* Keep track that this is now realized */
1218 u->cgroup_realized = true;
1219 u->cgroup_realized_mask = target_mask;
1220 u->cgroup_enabled_mask = enable_mask;
1221
1222 if (u->type != UNIT_SLICE && !c->delegate) {
1223
1224 /* Then, possibly move things over, but not if
1225 * subgroups may contain processes, which is the case
1226 * for slice and delegation units. */
1227 r = cg_migrate_everywhere(u->manager->cgroup_supported, u->cgroup_path, u->cgroup_path, migrate_callback, u);
1228 if (r < 0)
1229 log_unit_warning_errno(u, r, "Failed to migrate cgroup from to %s, ignoring: %m", u->cgroup_path);
1230 }
1231
1232 return 0;
1233 }
1234
1235 int unit_attach_pids_to_cgroup(Unit *u) {
1236 int r;
1237 assert(u);
1238
1239 r = unit_realize_cgroup(u);
1240 if (r < 0)
1241 return r;
1242
1243 r = cg_attach_many_everywhere(u->manager->cgroup_supported, u->cgroup_path, u->pids, migrate_callback, u);
1244 if (r < 0)
1245 return r;
1246
1247 return 0;
1248 }
1249
1250 static bool unit_has_mask_realized(Unit *u, CGroupMask target_mask, CGroupMask enable_mask) {
1251 assert(u);
1252
1253 return u->cgroup_realized && u->cgroup_realized_mask == target_mask && u->cgroup_enabled_mask == enable_mask;
1254 }
1255
1256 /* Check if necessary controllers and attributes for a unit are in place.
1257 *
1258 * If so, do nothing.
1259 * If not, create paths, move processes over, and set attributes.
1260 *
1261 * Returns 0 on success and < 0 on failure. */
1262 static int unit_realize_cgroup_now(Unit *u, ManagerState state) {
1263 CGroupMask target_mask, enable_mask;
1264 int r;
1265
1266 assert(u);
1267
1268 if (u->in_cgroup_queue) {
1269 LIST_REMOVE(cgroup_queue, u->manager->cgroup_queue, u);
1270 u->in_cgroup_queue = false;
1271 }
1272
1273 target_mask = unit_get_target_mask(u);
1274 enable_mask = unit_get_enable_mask(u);
1275
1276 if (unit_has_mask_realized(u, target_mask, enable_mask))
1277 return 0;
1278
1279 /* First, realize parents */
1280 if (UNIT_ISSET(u->slice)) {
1281 r = unit_realize_cgroup_now(UNIT_DEREF(u->slice), state);
1282 if (r < 0)
1283 return r;
1284 }
1285
1286 /* And then do the real work */
1287 r = unit_create_cgroup(u, target_mask, enable_mask);
1288 if (r < 0)
1289 return r;
1290
1291 /* Finally, apply the necessary attributes. */
1292 cgroup_context_apply(u, target_mask, state);
1293
1294 return 0;
1295 }
1296
1297 static void unit_add_to_cgroup_queue(Unit *u) {
1298
1299 if (u->in_cgroup_queue)
1300 return;
1301
1302 LIST_PREPEND(cgroup_queue, u->manager->cgroup_queue, u);
1303 u->in_cgroup_queue = true;
1304 }
1305
1306 unsigned manager_dispatch_cgroup_queue(Manager *m) {
1307 ManagerState state;
1308 unsigned n = 0;
1309 Unit *i;
1310 int r;
1311
1312 state = manager_state(m);
1313
1314 while ((i = m->cgroup_queue)) {
1315 assert(i->in_cgroup_queue);
1316
1317 r = unit_realize_cgroup_now(i, state);
1318 if (r < 0)
1319 log_warning_errno(r, "Failed to realize cgroups for queued unit %s, ignoring: %m", i->id);
1320
1321 n++;
1322 }
1323
1324 return n;
1325 }
1326
1327 static void unit_queue_siblings(Unit *u) {
1328 Unit *slice;
1329
1330 /* This adds the siblings of the specified unit and the
1331 * siblings of all parent units to the cgroup queue. (But
1332 * neither the specified unit itself nor the parents.) */
1333
1334 while ((slice = UNIT_DEREF(u->slice))) {
1335 Iterator i;
1336 Unit *m;
1337
1338 SET_FOREACH(m, slice->dependencies[UNIT_BEFORE], i) {
1339 if (m == u)
1340 continue;
1341
1342 /* Skip units that have a dependency on the slice
1343 * but aren't actually in it. */
1344 if (UNIT_DEREF(m->slice) != slice)
1345 continue;
1346
1347 /* No point in doing cgroup application for units
1348 * without active processes. */
1349 if (UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(m)))
1350 continue;
1351
1352 /* If the unit doesn't need any new controllers
1353 * and has current ones realized, it doesn't need
1354 * any changes. */
1355 if (unit_has_mask_realized(m, unit_get_target_mask(m), unit_get_enable_mask(m)))
1356 continue;
1357
1358 unit_add_to_cgroup_queue(m);
1359 }
1360
1361 u = slice;
1362 }
1363 }
1364
1365 int unit_realize_cgroup(Unit *u) {
1366 assert(u);
1367
1368 if (!UNIT_HAS_CGROUP_CONTEXT(u))
1369 return 0;
1370
1371 /* So, here's the deal: when realizing the cgroups for this
1372 * unit, we need to first create all parents, but there's more
1373 * actually: for the weight-based controllers we also need to
1374 * make sure that all our siblings (i.e. units that are in the
1375 * same slice as we are) have cgroups, too. Otherwise, things
1376 * would become very uneven as each of their processes would
1377 * get as much resources as all our group together. This call
1378 * will synchronously create the parent cgroups, but will
1379 * defer work on the siblings to the next event loop
1380 * iteration. */
1381
1382 /* Add all sibling slices to the cgroup queue. */
1383 unit_queue_siblings(u);
1384
1385 /* And realize this one now (and apply the values) */
1386 return unit_realize_cgroup_now(u, manager_state(u->manager));
1387 }
1388
1389 void unit_release_cgroup(Unit *u) {
1390 assert(u);
1391
1392 /* Forgets all cgroup details for this cgroup */
1393
1394 if (u->cgroup_path) {
1395 (void) hashmap_remove(u->manager->cgroup_unit, u->cgroup_path);
1396 u->cgroup_path = mfree(u->cgroup_path);
1397 }
1398
1399 if (u->cgroup_inotify_wd >= 0) {
1400 if (inotify_rm_watch(u->manager->cgroup_inotify_fd, u->cgroup_inotify_wd) < 0)
1401 log_unit_debug_errno(u, errno, "Failed to remove cgroup inotify watch %i for %s, ignoring", u->cgroup_inotify_wd, u->id);
1402
1403 (void) hashmap_remove(u->manager->cgroup_inotify_wd_unit, INT_TO_PTR(u->cgroup_inotify_wd));
1404 u->cgroup_inotify_wd = -1;
1405 }
1406 }
1407
1408 void unit_prune_cgroup(Unit *u) {
1409 int r;
1410 bool is_root_slice;
1411
1412 assert(u);
1413
1414 /* Removes the cgroup, if empty and possible, and stops watching it. */
1415
1416 if (!u->cgroup_path)
1417 return;
1418
1419 is_root_slice = unit_has_name(u, SPECIAL_ROOT_SLICE);
1420
1421 r = cg_trim_everywhere(u->manager->cgroup_supported, u->cgroup_path, !is_root_slice);
1422 if (r < 0) {
1423 log_unit_debug_errno(u, r, "Failed to destroy cgroup %s, ignoring: %m", u->cgroup_path);
1424 return;
1425 }
1426
1427 if (is_root_slice)
1428 return;
1429
1430 unit_release_cgroup(u);
1431
1432 u->cgroup_realized = false;
1433 u->cgroup_realized_mask = 0;
1434 u->cgroup_enabled_mask = 0;
1435 }
1436
1437 int unit_search_main_pid(Unit *u, pid_t *ret) {
1438 _cleanup_fclose_ FILE *f = NULL;
1439 pid_t pid = 0, npid, mypid;
1440 int r;
1441
1442 assert(u);
1443 assert(ret);
1444
1445 if (!u->cgroup_path)
1446 return -ENXIO;
1447
1448 r = cg_enumerate_processes(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, &f);
1449 if (r < 0)
1450 return r;
1451
1452 mypid = getpid();
1453 while (cg_read_pid(f, &npid) > 0) {
1454 pid_t ppid;
1455
1456 if (npid == pid)
1457 continue;
1458
1459 /* Ignore processes that aren't our kids */
1460 if (get_process_ppid(npid, &ppid) >= 0 && ppid != mypid)
1461 continue;
1462
1463 if (pid != 0)
1464 /* Dang, there's more than one daemonized PID
1465 in this group, so we don't know what process
1466 is the main process. */
1467
1468 return -ENODATA;
1469
1470 pid = npid;
1471 }
1472
1473 *ret = pid;
1474 return 0;
1475 }
1476
1477 static int unit_watch_pids_in_path(Unit *u, const char *path) {
1478 _cleanup_closedir_ DIR *d = NULL;
1479 _cleanup_fclose_ FILE *f = NULL;
1480 int ret = 0, r;
1481
1482 assert(u);
1483 assert(path);
1484
1485 r = cg_enumerate_processes(SYSTEMD_CGROUP_CONTROLLER, path, &f);
1486 if (r < 0)
1487 ret = r;
1488 else {
1489 pid_t pid;
1490
1491 while ((r = cg_read_pid(f, &pid)) > 0) {
1492 r = unit_watch_pid(u, pid);
1493 if (r < 0 && ret >= 0)
1494 ret = r;
1495 }
1496
1497 if (r < 0 && ret >= 0)
1498 ret = r;
1499 }
1500
1501 r = cg_enumerate_subgroups(SYSTEMD_CGROUP_CONTROLLER, path, &d);
1502 if (r < 0) {
1503 if (ret >= 0)
1504 ret = r;
1505 } else {
1506 char *fn;
1507
1508 while ((r = cg_read_subgroup(d, &fn)) > 0) {
1509 _cleanup_free_ char *p = NULL;
1510
1511 p = strjoin(path, "/", fn, NULL);
1512 free(fn);
1513
1514 if (!p)
1515 return -ENOMEM;
1516
1517 r = unit_watch_pids_in_path(u, p);
1518 if (r < 0 && ret >= 0)
1519 ret = r;
1520 }
1521
1522 if (r < 0 && ret >= 0)
1523 ret = r;
1524 }
1525
1526 return ret;
1527 }
1528
1529 int unit_watch_all_pids(Unit *u) {
1530 assert(u);
1531
1532 /* Adds all PIDs from our cgroup to the set of PIDs we
1533 * watch. This is a fallback logic for cases where we do not
1534 * get reliable cgroup empty notifications: we try to use
1535 * SIGCHLD as replacement. */
1536
1537 if (!u->cgroup_path)
1538 return -ENOENT;
1539
1540 if (cg_unified() > 0) /* On unified we can use proper notifications */
1541 return 0;
1542
1543 return unit_watch_pids_in_path(u, u->cgroup_path);
1544 }
1545
1546 int unit_notify_cgroup_empty(Unit *u) {
1547 int r;
1548
1549 assert(u);
1550
1551 if (!u->cgroup_path)
1552 return 0;
1553
1554 r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path);
1555 if (r <= 0)
1556 return r;
1557
1558 unit_add_to_gc_queue(u);
1559
1560 if (UNIT_VTABLE(u)->notify_cgroup_empty)
1561 UNIT_VTABLE(u)->notify_cgroup_empty(u);
1562
1563 return 0;
1564 }
1565
1566 static int on_cgroup_inotify_event(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
1567 Manager *m = userdata;
1568
1569 assert(s);
1570 assert(fd >= 0);
1571 assert(m);
1572
1573 for (;;) {
1574 union inotify_event_buffer buffer;
1575 struct inotify_event *e;
1576 ssize_t l;
1577
1578 l = read(fd, &buffer, sizeof(buffer));
1579 if (l < 0) {
1580 if (errno == EINTR || errno == EAGAIN)
1581 return 0;
1582
1583 return log_error_errno(errno, "Failed to read control group inotify events: %m");
1584 }
1585
1586 FOREACH_INOTIFY_EVENT(e, buffer, l) {
1587 Unit *u;
1588
1589 if (e->wd < 0)
1590 /* Queue overflow has no watch descriptor */
1591 continue;
1592
1593 if (e->mask & IN_IGNORED)
1594 /* The watch was just removed */
1595 continue;
1596
1597 u = hashmap_get(m->cgroup_inotify_wd_unit, INT_TO_PTR(e->wd));
1598 if (!u) /* Not that inotify might deliver
1599 * events for a watch even after it
1600 * was removed, because it was queued
1601 * before the removal. Let's ignore
1602 * this here safely. */
1603 continue;
1604
1605 (void) unit_notify_cgroup_empty(u);
1606 }
1607 }
1608 }
1609
1610 int manager_setup_cgroup(Manager *m) {
1611 _cleanup_free_ char *path = NULL;
1612 CGroupController c;
1613 int r, unified;
1614 char *e;
1615
1616 assert(m);
1617
1618 /* 1. Determine hierarchy */
1619 m->cgroup_root = mfree(m->cgroup_root);
1620 r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 0, &m->cgroup_root);
1621 if (r < 0)
1622 return log_error_errno(r, "Cannot determine cgroup we are running in: %m");
1623
1624 /* Chop off the init scope, if we are already located in it */
1625 e = endswith(m->cgroup_root, "/" SPECIAL_INIT_SCOPE);
1626
1627 /* LEGACY: Also chop off the system slice if we are in
1628 * it. This is to support live upgrades from older systemd
1629 * versions where PID 1 was moved there. Also see
1630 * cg_get_root_path(). */
1631 if (!e && MANAGER_IS_SYSTEM(m)) {
1632 e = endswith(m->cgroup_root, "/" SPECIAL_SYSTEM_SLICE);
1633 if (!e)
1634 e = endswith(m->cgroup_root, "/system"); /* even more legacy */
1635 }
1636 if (e)
1637 *e = 0;
1638
1639 /* And make sure to store away the root value without trailing
1640 * slash, even for the root dir, so that we can easily prepend
1641 * it everywhere. */
1642 while ((e = endswith(m->cgroup_root, "/")))
1643 *e = 0;
1644
1645 /* 2. Show data */
1646 r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, NULL, &path);
1647 if (r < 0)
1648 return log_error_errno(r, "Cannot find cgroup mount point: %m");
1649
1650 unified = cg_unified();
1651 if (unified < 0)
1652 return log_error_errno(r, "Couldn't determine if we are running in the unified hierarchy: %m");
1653 if (unified > 0)
1654 log_debug("Unified cgroup hierarchy is located at %s.", path);
1655 else
1656 log_debug("Using cgroup controller " SYSTEMD_CGROUP_CONTROLLER ". File system hierarchy is at %s.", path);
1657
1658 if (!m->test_run) {
1659 const char *scope_path;
1660
1661 /* 3. Install agent */
1662 if (unified) {
1663
1664 /* In the unified hierarchy we can get
1665 * cgroup empty notifications via inotify. */
1666
1667 m->cgroup_inotify_event_source = sd_event_source_unref(m->cgroup_inotify_event_source);
1668 safe_close(m->cgroup_inotify_fd);
1669
1670 m->cgroup_inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC);
1671 if (m->cgroup_inotify_fd < 0)
1672 return log_error_errno(errno, "Failed to create control group inotify object: %m");
1673
1674 r = sd_event_add_io(m->event, &m->cgroup_inotify_event_source, m->cgroup_inotify_fd, EPOLLIN, on_cgroup_inotify_event, m);
1675 if (r < 0)
1676 return log_error_errno(r, "Failed to watch control group inotify object: %m");
1677
1678 /* Process cgroup empty notifications early, but after service notifications and SIGCHLD. Also
1679 * see handling of cgroup agent notifications, for the classic cgroup hierarchy support. */
1680 r = sd_event_source_set_priority(m->cgroup_inotify_event_source, SD_EVENT_PRIORITY_NORMAL-5);
1681 if (r < 0)
1682 return log_error_errno(r, "Failed to set priority of inotify event source: %m");
1683
1684 (void) sd_event_source_set_description(m->cgroup_inotify_event_source, "cgroup-inotify");
1685
1686 } else if (MANAGER_IS_SYSTEM(m)) {
1687
1688 /* On the legacy hierarchy we only get
1689 * notifications via cgroup agents. (Which
1690 * isn't really reliable, since it does not
1691 * generate events when control groups with
1692 * children run empty. */
1693
1694 r = cg_install_release_agent(SYSTEMD_CGROUP_CONTROLLER, SYSTEMD_CGROUP_AGENT_PATH);
1695 if (r < 0)
1696 log_warning_errno(r, "Failed to install release agent, ignoring: %m");
1697 else if (r > 0)
1698 log_debug("Installed release agent.");
1699 else if (r == 0)
1700 log_debug("Release agent already installed.");
1701 }
1702
1703 /* 4. Make sure we are in the special "init.scope" unit in the root slice. */
1704 scope_path = strjoina(m->cgroup_root, "/" SPECIAL_INIT_SCOPE);
1705 r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, scope_path, 0);
1706 if (r < 0)
1707 return log_error_errno(r, "Failed to create %s control group: %m", scope_path);
1708
1709 /* also, move all other userspace processes remaining
1710 * in the root cgroup into that scope. */
1711 r = cg_migrate(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, SYSTEMD_CGROUP_CONTROLLER, scope_path, 0);
1712 if (r < 0)
1713 log_warning_errno(r, "Couldn't move remaining userspace processes, ignoring: %m");
1714
1715 /* 5. And pin it, so that it cannot be unmounted */
1716 safe_close(m->pin_cgroupfs_fd);
1717 m->pin_cgroupfs_fd = open(path, O_RDONLY|O_CLOEXEC|O_DIRECTORY|O_NOCTTY|O_NONBLOCK);
1718 if (m->pin_cgroupfs_fd < 0)
1719 return log_error_errno(errno, "Failed to open pin file: %m");
1720
1721 /* 6. Always enable hierarchical support if it exists... */
1722 if (!unified)
1723 (void) cg_set_attribute("memory", "/", "memory.use_hierarchy", "1");
1724 }
1725
1726 /* 7. Figure out which controllers are supported */
1727 r = cg_mask_supported(&m->cgroup_supported);
1728 if (r < 0)
1729 return log_error_errno(r, "Failed to determine supported controllers: %m");
1730
1731 for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++)
1732 log_debug("Controller '%s' supported: %s", cgroup_controller_to_string(c), yes_no(m->cgroup_supported & CGROUP_CONTROLLER_TO_MASK(c)));
1733
1734 return 0;
1735 }
1736
1737 void manager_shutdown_cgroup(Manager *m, bool delete) {
1738 assert(m);
1739
1740 /* We can't really delete the group, since we are in it. But
1741 * let's trim it. */
1742 if (delete && m->cgroup_root)
1743 (void) cg_trim(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, false);
1744
1745 m->cgroup_inotify_wd_unit = hashmap_free(m->cgroup_inotify_wd_unit);
1746
1747 m->cgroup_inotify_event_source = sd_event_source_unref(m->cgroup_inotify_event_source);
1748 m->cgroup_inotify_fd = safe_close(m->cgroup_inotify_fd);
1749
1750 m->pin_cgroupfs_fd = safe_close(m->pin_cgroupfs_fd);
1751
1752 m->cgroup_root = mfree(m->cgroup_root);
1753 }
1754
1755 Unit* manager_get_unit_by_cgroup(Manager *m, const char *cgroup) {
1756 char *p;
1757 Unit *u;
1758
1759 assert(m);
1760 assert(cgroup);
1761
1762 u = hashmap_get(m->cgroup_unit, cgroup);
1763 if (u)
1764 return u;
1765
1766 p = strdupa(cgroup);
1767 for (;;) {
1768 char *e;
1769
1770 e = strrchr(p, '/');
1771 if (!e || e == p)
1772 return hashmap_get(m->cgroup_unit, SPECIAL_ROOT_SLICE);
1773
1774 *e = 0;
1775
1776 u = hashmap_get(m->cgroup_unit, p);
1777 if (u)
1778 return u;
1779 }
1780 }
1781
1782 Unit *manager_get_unit_by_pid_cgroup(Manager *m, pid_t pid) {
1783 _cleanup_free_ char *cgroup = NULL;
1784 int r;
1785
1786 assert(m);
1787
1788 if (pid <= 0)
1789 return NULL;
1790
1791 r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, pid, &cgroup);
1792 if (r < 0)
1793 return NULL;
1794
1795 return manager_get_unit_by_cgroup(m, cgroup);
1796 }
1797
1798 Unit *manager_get_unit_by_pid(Manager *m, pid_t pid) {
1799 Unit *u;
1800
1801 assert(m);
1802
1803 if (pid <= 0)
1804 return NULL;
1805
1806 if (pid == 1)
1807 return hashmap_get(m->units, SPECIAL_INIT_SCOPE);
1808
1809 u = hashmap_get(m->watch_pids1, PID_TO_PTR(pid));
1810 if (u)
1811 return u;
1812
1813 u = hashmap_get(m->watch_pids2, PID_TO_PTR(pid));
1814 if (u)
1815 return u;
1816
1817 return manager_get_unit_by_pid_cgroup(m, pid);
1818 }
1819
1820 int manager_notify_cgroup_empty(Manager *m, const char *cgroup) {
1821 Unit *u;
1822
1823 assert(m);
1824 assert(cgroup);
1825
1826 log_debug("Got cgroup empty notification for: %s", cgroup);
1827
1828 u = manager_get_unit_by_cgroup(m, cgroup);
1829 if (!u)
1830 return 0;
1831
1832 return unit_notify_cgroup_empty(u);
1833 }
1834
1835 int unit_get_memory_current(Unit *u, uint64_t *ret) {
1836 _cleanup_free_ char *v = NULL;
1837 int r;
1838
1839 assert(u);
1840 assert(ret);
1841
1842 if (!u->cgroup_path)
1843 return -ENODATA;
1844
1845 if ((u->cgroup_realized_mask & CGROUP_MASK_MEMORY) == 0)
1846 return -ENODATA;
1847
1848 if (cg_unified() <= 0)
1849 r = cg_get_attribute("memory", u->cgroup_path, "memory.usage_in_bytes", &v);
1850 else
1851 r = cg_get_attribute("memory", u->cgroup_path, "memory.current", &v);
1852 if (r == -ENOENT)
1853 return -ENODATA;
1854 if (r < 0)
1855 return r;
1856
1857 return safe_atou64(v, ret);
1858 }
1859
1860 int unit_get_tasks_current(Unit *u, uint64_t *ret) {
1861 _cleanup_free_ char *v = NULL;
1862 int r;
1863
1864 assert(u);
1865 assert(ret);
1866
1867 if (!u->cgroup_path)
1868 return -ENODATA;
1869
1870 if ((u->cgroup_realized_mask & CGROUP_MASK_PIDS) == 0)
1871 return -ENODATA;
1872
1873 r = cg_get_attribute("pids", u->cgroup_path, "pids.current", &v);
1874 if (r == -ENOENT)
1875 return -ENODATA;
1876 if (r < 0)
1877 return r;
1878
1879 return safe_atou64(v, ret);
1880 }
1881
1882 static int unit_get_cpu_usage_raw(Unit *u, nsec_t *ret) {
1883 _cleanup_free_ char *v = NULL;
1884 uint64_t ns;
1885 int r;
1886
1887 assert(u);
1888 assert(ret);
1889
1890 if (!u->cgroup_path)
1891 return -ENODATA;
1892
1893 if ((u->cgroup_realized_mask & CGROUP_MASK_CPUACCT) == 0)
1894 return -ENODATA;
1895
1896 r = cg_get_attribute("cpuacct", u->cgroup_path, "cpuacct.usage", &v);
1897 if (r == -ENOENT)
1898 return -ENODATA;
1899 if (r < 0)
1900 return r;
1901
1902 r = safe_atou64(v, &ns);
1903 if (r < 0)
1904 return r;
1905
1906 *ret = ns;
1907 return 0;
1908 }
1909
1910 int unit_get_cpu_usage(Unit *u, nsec_t *ret) {
1911 nsec_t ns;
1912 int r;
1913
1914 r = unit_get_cpu_usage_raw(u, &ns);
1915 if (r < 0)
1916 return r;
1917
1918 if (ns > u->cpuacct_usage_base)
1919 ns -= u->cpuacct_usage_base;
1920 else
1921 ns = 0;
1922
1923 *ret = ns;
1924 return 0;
1925 }
1926
1927 int unit_reset_cpu_usage(Unit *u) {
1928 nsec_t ns;
1929 int r;
1930
1931 assert(u);
1932
1933 r = unit_get_cpu_usage_raw(u, &ns);
1934 if (r < 0) {
1935 u->cpuacct_usage_base = 0;
1936 return r;
1937 }
1938
1939 u->cpuacct_usage_base = ns;
1940 return 0;
1941 }
1942
1943 bool unit_cgroup_delegate(Unit *u) {
1944 CGroupContext *c;
1945
1946 assert(u);
1947
1948 c = unit_get_cgroup_context(u);
1949 if (!c)
1950 return false;
1951
1952 return c->delegate;
1953 }
1954
1955 void unit_invalidate_cgroup(Unit *u, CGroupMask m) {
1956 assert(u);
1957
1958 if (!UNIT_HAS_CGROUP_CONTEXT(u))
1959 return;
1960
1961 if (m == 0)
1962 return;
1963
1964 /* always invalidate compat pairs together */
1965 if (m & (CGROUP_MASK_IO | CGROUP_MASK_BLKIO))
1966 m |= CGROUP_MASK_IO | CGROUP_MASK_BLKIO;
1967
1968 if ((u->cgroup_realized_mask & m) == 0)
1969 return;
1970
1971 u->cgroup_realized_mask &= ~m;
1972 unit_add_to_cgroup_queue(u);
1973 }
1974
1975 void manager_invalidate_startup_units(Manager *m) {
1976 Iterator i;
1977 Unit *u;
1978
1979 assert(m);
1980
1981 SET_FOREACH(u, m->startup_units, i)
1982 unit_invalidate_cgroup(u, CGROUP_MASK_CPU|CGROUP_MASK_IO|CGROUP_MASK_BLKIO);
1983 }
1984
1985 static const char* const cgroup_device_policy_table[_CGROUP_DEVICE_POLICY_MAX] = {
1986 [CGROUP_AUTO] = "auto",
1987 [CGROUP_CLOSED] = "closed",
1988 [CGROUP_STRICT] = "strict",
1989 };
1990
1991 DEFINE_STRING_TABLE_LOOKUP(cgroup_device_policy, CGroupDevicePolicy);
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