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unit: remove unused fields from Unit structure
[thirdparty/systemd.git] / src / core / cgroup.c
CommitLineData
8e274523
LP		 1/***
2 This file is part of systemd.
3
4ad49000 4 Copyright 2013 Lennart Poettering
8e274523
LP		 5
6 systemd is free software; you can redistribute it and/or modify it
5430f7f2
LP		 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
8e274523
LP		 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
5430f7f2 14 Lesser General Public License for more details.
8e274523 15
5430f7f2 16 You should have received a copy of the GNU Lesser General Public License
8e274523
LP		 17 along with systemd; If not, see <http://www.gnu.org/licenses/>.
18***/
19
c6c18be3 20#include <fcntl.h>
e41969e3 21#include <fnmatch.h>
8c6db833 22
b5efdb8a 23#include "alloc-util.h"
906c06f6 24#include "bpf-firewall.h"
03a7b521 25#include "cgroup-util.h"
3ffd4af2
LP		 26#include "cgroup.h"
27#include "fd-util.h"
0d39fa9c 28#include "fileio.h"
77601719 29#include "fs-util.h"
6bedfcbb 30#include "parse-util.h"
9eb977db 31#include "path-util.h"
03a7b521 32#include "process-util.h"
9444b1f2 33#include "special.h"
906c06f6 34#include "stdio-util.h"
8b43440b 35#include "string-table.h"
07630cea 36#include "string-util.h"
8e274523 37
9a054909
LP		 38#define CGROUP_CPU_QUOTA_PERIOD_USEC ((usec_t) 100 * USEC_PER_MSEC)
39
2b40998d 40static void cgroup_compat_warn(void) {
128fadc9
TH		 41 static bool cgroup_compat_warned = false;
42
43 if (cgroup_compat_warned)
44 return;
45
46 log_warning("cgroup compatibility translation between legacy and unified hierarchy settings activated. See cgroup-compat debug messages for details.");
47 cgroup_compat_warned = true;
48}
49
50#define log_cgroup_compat(unit, fmt, ...) do { \
51 cgroup_compat_warn(); \
52 log_unit_debug(unit, "cgroup-compat: " fmt, ##__VA_ARGS__); \
2b40998d 53 } while (false)
128fadc9 54
4ad49000
LP		 55void cgroup_context_init(CGroupContext *c) {
56 assert(c);
57
58 /* Initialize everything to the kernel defaults, assuming the
59 * structure is preinitialized to 0 */
60
66ebf6c0
TH		 61 c->cpu_weight = CGROUP_WEIGHT_INVALID;
62 c->startup_cpu_weight = CGROUP_WEIGHT_INVALID;
63 c->cpu_quota_per_sec_usec = USEC_INFINITY;
64
d53d9474
LP		 65 c->cpu_shares = CGROUP_CPU_SHARES_INVALID;
66 c->startup_cpu_shares = CGROUP_CPU_SHARES_INVALID;
d53d9474 67
da4d897e
TH		 68 c->memory_high = CGROUP_LIMIT_MAX;
69 c->memory_max = CGROUP_LIMIT_MAX;
96e131ea 70 c->memory_swap_max = CGROUP_LIMIT_MAX;
da4d897e
TH		 71
72 c->memory_limit = CGROUP_LIMIT_MAX;
b2f8b02e 73
13c31542
TH		 74 c->io_weight = CGROUP_WEIGHT_INVALID;
75 c->startup_io_weight = CGROUP_WEIGHT_INVALID;
76
d53d9474
LP		 77 c->blockio_weight = CGROUP_BLKIO_WEIGHT_INVALID;
78 c->startup_blockio_weight = CGROUP_BLKIO_WEIGHT_INVALID;
79
80 c->tasks_max = (uint64_t) -1;
4ad49000 81}
8e274523 82
4ad49000
LP		 83void cgroup_context_free_device_allow(CGroupContext *c, CGroupDeviceAllow *a) {
84 assert(c);
85 assert(a);
86
71fda00f 87 LIST_REMOVE(device_allow, c->device_allow, a);
4ad49000
LP		 88 free(a->path);
89 free(a);
90}
91
13c31542
TH		 92void cgroup_context_free_io_device_weight(CGroupContext *c, CGroupIODeviceWeight *w) {
93 assert(c);
94 assert(w);
95
96 LIST_REMOVE(device_weights, c->io_device_weights, w);
97 free(w->path);
98 free(w);
99}
100
101void cgroup_context_free_io_device_limit(CGroupContext *c, CGroupIODeviceLimit *l) {
102 assert(c);
103 assert(l);
104
105 LIST_REMOVE(device_limits, c->io_device_limits, l);
106 free(l->path);
107 free(l);
108}
109
4ad49000
LP		 110void cgroup_context_free_blockio_device_weight(CGroupContext *c, CGroupBlockIODeviceWeight *w) {
111 assert(c);
112 assert(w);
113
71fda00f 114 LIST_REMOVE(device_weights, c->blockio_device_weights, w);
4ad49000
LP		 115 free(w->path);
116 free(w);
117}
118
119void cgroup_context_free_blockio_device_bandwidth(CGroupContext *c, CGroupBlockIODeviceBandwidth *b) {
120 assert(c);
8e274523 121 assert(b);
8e274523 122
71fda00f 123 LIST_REMOVE(device_bandwidths, c->blockio_device_bandwidths, b);
4ad49000
LP		 124 free(b->path);
125 free(b);
126}
127
128void cgroup_context_done(CGroupContext *c) {
129 assert(c);
130
13c31542
TH		 131 while (c->io_device_weights)
132 cgroup_context_free_io_device_weight(c, c->io_device_weights);
133
134 while (c->io_device_limits)
135 cgroup_context_free_io_device_limit(c, c->io_device_limits);
136
4ad49000
LP		 137 while (c->blockio_device_weights)
138 cgroup_context_free_blockio_device_weight(c, c->blockio_device_weights);
139
140 while (c->blockio_device_bandwidths)
141 cgroup_context_free_blockio_device_bandwidth(c, c->blockio_device_bandwidths);
142
143 while (c->device_allow)
144 cgroup_context_free_device_allow(c, c->device_allow);
6a48d82f
DM		 145
146 c->ip_address_allow = ip_address_access_free_all(c->ip_address_allow);
147 c->ip_address_deny = ip_address_access_free_all(c->ip_address_deny);
4ad49000
LP		 148}
149
150void cgroup_context_dump(CGroupContext *c, FILE* f, const char *prefix) {
13c31542
TH		 151 CGroupIODeviceLimit *il;
152 CGroupIODeviceWeight *iw;
4ad49000
LP		 153 CGroupBlockIODeviceBandwidth *b;
154 CGroupBlockIODeviceWeight *w;
155 CGroupDeviceAllow *a;
c21c9906 156 IPAddressAccessItem *iaai;
9a054909 157 char u[FORMAT_TIMESPAN_MAX];
4ad49000
LP		 158
159 assert(c);
160 assert(f);
161
162 prefix = strempty(prefix);
163
164 fprintf(f,
165 "%sCPUAccounting=%s\n"
13c31542 166 "%sIOAccounting=%s\n"
4ad49000
LP		 167 "%sBlockIOAccounting=%s\n"
168 "%sMemoryAccounting=%s\n"
d53d9474 169 "%sTasksAccounting=%s\n"
c21c9906 170 "%sIPAccounting=%s\n"
66ebf6c0
TH		 171 "%sCPUWeight=%" PRIu64 "\n"
172 "%sStartupCPUWeight=%" PRIu64 "\n"
d53d9474
LP		 173 "%sCPUShares=%" PRIu64 "\n"
174 "%sStartupCPUShares=%" PRIu64 "\n"
b2f8b02e 175 "%sCPUQuotaPerSecSec=%s\n"
13c31542
TH		 176 "%sIOWeight=%" PRIu64 "\n"
177 "%sStartupIOWeight=%" PRIu64 "\n"
d53d9474
LP		 178 "%sBlockIOWeight=%" PRIu64 "\n"
179 "%sStartupBlockIOWeight=%" PRIu64 "\n"
da4d897e
TH		 180 "%sMemoryLow=%" PRIu64 "\n"
181 "%sMemoryHigh=%" PRIu64 "\n"
182 "%sMemoryMax=%" PRIu64 "\n"
96e131ea 183 "%sMemorySwapMax=%" PRIu64 "\n"
4ad49000 184 "%sMemoryLimit=%" PRIu64 "\n"
03a7b521 185 "%sTasksMax=%" PRIu64 "\n"
a931ad47
LP		 186 "%sDevicePolicy=%s\n"
187 "%sDelegate=%s\n",
4ad49000 188 prefix, yes_no(c->cpu_accounting),
13c31542 189 prefix, yes_no(c->io_accounting),
4ad49000
LP		 190 prefix, yes_no(c->blockio_accounting),
191 prefix, yes_no(c->memory_accounting),
d53d9474 192 prefix, yes_no(c->tasks_accounting),
c21c9906 193 prefix, yes_no(c->ip_accounting),
66ebf6c0
TH		 194 prefix, c->cpu_weight,
195 prefix, c->startup_cpu_weight,
4ad49000 196 prefix, c->cpu_shares,
95ae05c0 197 prefix, c->startup_cpu_shares,
b1d6dcf5 198 prefix, format_timespan(u, sizeof(u), c->cpu_quota_per_sec_usec, 1),
13c31542
TH		 199 prefix, c->io_weight,
200 prefix, c->startup_io_weight,
4ad49000 201 prefix, c->blockio_weight,
95ae05c0 202 prefix, c->startup_blockio_weight,
da4d897e
TH		 203 prefix, c->memory_low,
204 prefix, c->memory_high,
205 prefix, c->memory_max,
96e131ea 206 prefix, c->memory_swap_max,
4ad49000 207 prefix, c->memory_limit,
03a7b521 208 prefix, c->tasks_max,
a931ad47
LP		 209 prefix, cgroup_device_policy_to_string(c->device_policy),
210 prefix, yes_no(c->delegate));
4ad49000
LP		 211
212 LIST_FOREACH(device_allow, a, c->device_allow)
213 fprintf(f,
214 "%sDeviceAllow=%s %s%s%s\n",
215 prefix,
216 a->path,
217 a->r ? "r" : "", a->w ? "w" : "", a->m ? "m" : "");
218
13c31542
TH		 219 LIST_FOREACH(device_weights, iw, c->io_device_weights)
220 fprintf(f,
221 "%sIODeviceWeight=%s %" PRIu64,
222 prefix,
223 iw->path,
224 iw->weight);
225
226 LIST_FOREACH(device_limits, il, c->io_device_limits) {
227 char buf[FORMAT_BYTES_MAX];
9be57249
TH		 228 CGroupIOLimitType type;
229
230 for (type = 0; type < _CGROUP_IO_LIMIT_TYPE_MAX; type++)
231 if (il->limits[type] != cgroup_io_limit_defaults[type])
232 fprintf(f,
233 "%s%s=%s %s\n",
234 prefix,
235 cgroup_io_limit_type_to_string(type),
236 il->path,
237 format_bytes(buf, sizeof(buf), il->limits[type]));
13c31542
TH		 238 }
239
4ad49000
LP		 240 LIST_FOREACH(device_weights, w, c->blockio_device_weights)
241 fprintf(f,
d53d9474 242 "%sBlockIODeviceWeight=%s %" PRIu64,
4ad49000
LP		 243 prefix,
244 w->path,
245 w->weight);
246
247 LIST_FOREACH(device_bandwidths, b, c->blockio_device_bandwidths) {
248 char buf[FORMAT_BYTES_MAX];
249
979d0311
TH		 250 if (b->rbps != CGROUP_LIMIT_MAX)
251 fprintf(f,
252 "%sBlockIOReadBandwidth=%s %s\n",
253 prefix,
254 b->path,
255 format_bytes(buf, sizeof(buf), b->rbps));
256 if (b->wbps != CGROUP_LIMIT_MAX)
257 fprintf(f,
258 "%sBlockIOWriteBandwidth=%s %s\n",
259 prefix,
260 b->path,
261 format_bytes(buf, sizeof(buf), b->wbps));
4ad49000 262 }
c21c9906
LP		 263
264 LIST_FOREACH(items, iaai, c->ip_address_allow) {
265 _cleanup_free_ char *k = NULL;
266
267 (void) in_addr_to_string(iaai->family, &iaai->address, &k);
268 fprintf(f, "%sIPAddressAllow=%s/%u\n", prefix, strnull(k), iaai->prefixlen);
269 }
270
271 LIST_FOREACH(items, iaai, c->ip_address_deny) {
272 _cleanup_free_ char *k = NULL;
273
274 (void) in_addr_to_string(iaai->family, &iaai->address, &k);
275 fprintf(f, "%sIPAddressDeny=%s/%u\n", prefix, strnull(k), iaai->prefixlen);
276 }
4ad49000
LP		 277}
278
13c31542 279static int lookup_block_device(const char *p, dev_t *dev) {
4ad49000
LP		 280 struct stat st;
281 int r;
282
283 assert(p);
284 assert(dev);
285
286 r = stat(p, &st);
4a62c710
MS		 287 if (r < 0)
288 return log_warning_errno(errno, "Couldn't stat device %s: %m", p);
8e274523 289
4ad49000
LP		 290 if (S_ISBLK(st.st_mode))
291 *dev = st.st_rdev;
292 else if (major(st.st_dev) != 0) {
293 /* If this is not a device node then find the block
294 * device this file is stored on */
295 *dev = st.st_dev;
296
297 /* If this is a partition, try to get the originating
298 * block device */
299 block_get_whole_disk(*dev, dev);
300 } else {
301 log_warning("%s is not a block device and file system block device cannot be determined or is not local.", p);
302 return -ENODEV;
303 }
8e274523 304
8e274523 305 return 0;
8e274523
LP		 306}
307
4ad49000
LP		 308static int whitelist_device(const char *path, const char *node, const char *acc) {
309 char buf[2+DECIMAL_STR_MAX(dev_t)*2+2+4];
310 struct stat st;
b200489b 311 bool ignore_notfound;
8c6db833 312 int r;
8e274523 313
4ad49000
LP		 314 assert(path);
315 assert(acc);
8e274523 316
b200489b
DR		 317 if (node[0] == '-') {
318 /* Non-existent paths starting with "-" must be silently ignored */
319 node++;
320 ignore_notfound = true;
321 } else
322 ignore_notfound = false;
323
4ad49000 324 if (stat(node, &st) < 0) {
b200489b 325 if (errno == ENOENT && ignore_notfound)
e7330dfe
DP		 326 return 0;
327
328 return log_warning_errno(errno, "Couldn't stat device %s: %m", node);
4ad49000
LP		 329 }
330
331 if (!S_ISCHR(st.st_mode) && !S_ISBLK(st.st_mode)) {
332 log_warning("%s is not a device.", node);
333 return -ENODEV;
334 }
335
336 sprintf(buf,
337 "%c %u:%u %s",
338 S_ISCHR(st.st_mode) ? 'c' : 'b',
339 major(st.st_rdev), minor(st.st_rdev),
340 acc);
341
342 r = cg_set_attribute("devices", path, "devices.allow", buf);
1aeab12b 343 if (r < 0)
077ba06e 344 log_full_errno(IN_SET(r, -ENOENT, -EROFS, -EINVAL, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
714e2e1d 345 "Failed to set devices.allow on %s: %m", path);
4ad49000
LP		 346
347 return r;
8e274523
LP		 348}
349
90060676
LP		 350static int whitelist_major(const char *path, const char *name, char type, const char *acc) {
351 _cleanup_fclose_ FILE *f = NULL;
352 char line[LINE_MAX];
353 bool good = false;
354 int r;
355
356 assert(path);
357 assert(acc);
358 assert(type == 'b' || type == 'c');
359
360 f = fopen("/proc/devices", "re");
4a62c710
MS		 361 if (!f)
362 return log_warning_errno(errno, "Cannot open /proc/devices to resolve %s (%c): %m", name, type);
90060676
LP		 363
364 FOREACH_LINE(line, f, goto fail) {
365 char buf[2+DECIMAL_STR_MAX(unsigned)+3+4], *p, *w;
366 unsigned maj;
367
368 truncate_nl(line);
369
370 if (type == 'c' && streq(line, "Character devices:")) {
371 good = true;
372 continue;
373 }
374
375 if (type == 'b' && streq(line, "Block devices:")) {
376 good = true;
377 continue;
378 }
379
380 if (isempty(line)) {
381 good = false;
382 continue;
383 }
384
385 if (!good)
386 continue;
387
388 p = strstrip(line);
389
390 w = strpbrk(p, WHITESPACE);
391 if (!w)
392 continue;
393 *w = 0;
394
395 r = safe_atou(p, &maj);
396 if (r < 0)
397 continue;
398 if (maj <= 0)
399 continue;
400
401 w++;
402 w += strspn(w, WHITESPACE);
e41969e3
LP		 403
404 if (fnmatch(name, w, 0) != 0)
90060676
LP		 405 continue;
406
407 sprintf(buf,
408 "%c %u:* %s",
409 type,
410 maj,
411 acc);
412
413 r = cg_set_attribute("devices", path, "devices.allow", buf);
1aeab12b 414 if (r < 0)
077ba06e 415 log_full_errno(IN_SET(r, -ENOENT, -EROFS, -EINVAL, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
714e2e1d 416 "Failed to set devices.allow on %s: %m", path);
90060676
LP		 417 }
418
419 return 0;
420
421fail:
25f027c5 422 return log_warning_errno(errno, "Failed to read /proc/devices: %m");
90060676
LP		 423}
424
66ebf6c0
TH		 425static bool cgroup_context_has_cpu_weight(CGroupContext *c) {
426 return c->cpu_weight != CGROUP_WEIGHT_INVALID ||
427 c->startup_cpu_weight != CGROUP_WEIGHT_INVALID;
428}
429
430static bool cgroup_context_has_cpu_shares(CGroupContext *c) {
431 return c->cpu_shares != CGROUP_CPU_SHARES_INVALID ||
432 c->startup_cpu_shares != CGROUP_CPU_SHARES_INVALID;
433}
434
435static uint64_t cgroup_context_cpu_weight(CGroupContext *c, ManagerState state) {
436 if (IN_SET(state, MANAGER_STARTING, MANAGER_INITIALIZING) &&
437 c->startup_cpu_weight != CGROUP_WEIGHT_INVALID)
438 return c->startup_cpu_weight;
439 else if (c->cpu_weight != CGROUP_WEIGHT_INVALID)
440 return c->cpu_weight;
441 else
442 return CGROUP_WEIGHT_DEFAULT;
443}
444
445static uint64_t cgroup_context_cpu_shares(CGroupContext *c, ManagerState state) {
446 if (IN_SET(state, MANAGER_STARTING, MANAGER_INITIALIZING) &&
447 c->startup_cpu_shares != CGROUP_CPU_SHARES_INVALID)
448 return c->startup_cpu_shares;
449 else if (c->cpu_shares != CGROUP_CPU_SHARES_INVALID)
450 return c->cpu_shares;
451 else
452 return CGROUP_CPU_SHARES_DEFAULT;
453}
454
455static void cgroup_apply_unified_cpu_config(Unit *u, uint64_t weight, uint64_t quota) {
456 char buf[MAX(DECIMAL_STR_MAX(uint64_t) + 1, (DECIMAL_STR_MAX(usec_t) + 1) * 2)];
457 int r;
458
459 xsprintf(buf, "%" PRIu64 "\n", weight);
460 r = cg_set_attribute("cpu", u->cgroup_path, "cpu.weight", buf);
461 if (r < 0)
462 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
463 "Failed to set cpu.weight: %m");
464
465 if (quota != USEC_INFINITY)
466 xsprintf(buf, USEC_FMT " " USEC_FMT "\n",
467 quota * CGROUP_CPU_QUOTA_PERIOD_USEC / USEC_PER_SEC, CGROUP_CPU_QUOTA_PERIOD_USEC);
468 else
469 xsprintf(buf, "max " USEC_FMT "\n", CGROUP_CPU_QUOTA_PERIOD_USEC);
470
471 r = cg_set_attribute("cpu", u->cgroup_path, "cpu.max", buf);
472
473 if (r < 0)
474 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
475 "Failed to set cpu.max: %m");
476}
477
478static void cgroup_apply_legacy_cpu_config(Unit *u, uint64_t shares, uint64_t quota) {
479 char buf[MAX(DECIMAL_STR_MAX(uint64_t), DECIMAL_STR_MAX(usec_t)) + 1];
480 int r;
481
482 xsprintf(buf, "%" PRIu64 "\n", shares);
483 r = cg_set_attribute("cpu", u->cgroup_path, "cpu.shares", buf);
484 if (r < 0)
485 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
486 "Failed to set cpu.shares: %m");
487
488 xsprintf(buf, USEC_FMT "\n", CGROUP_CPU_QUOTA_PERIOD_USEC);
489 r = cg_set_attribute("cpu", u->cgroup_path, "cpu.cfs_period_us", buf);
490 if (r < 0)
491 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
492 "Failed to set cpu.cfs_period_us: %m");
493
494 if (quota != USEC_INFINITY) {
495 xsprintf(buf, USEC_FMT "\n", quota * CGROUP_CPU_QUOTA_PERIOD_USEC / USEC_PER_SEC);
496 r = cg_set_attribute("cpu", u->cgroup_path, "cpu.cfs_quota_us", buf);
497 } else
498 r = cg_set_attribute("cpu", u->cgroup_path, "cpu.cfs_quota_us", "-1");
499 if (r < 0)
500 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
501 "Failed to set cpu.cfs_quota_us: %m");
502}
503
504static uint64_t cgroup_cpu_shares_to_weight(uint64_t shares) {
505 return CLAMP(shares * CGROUP_WEIGHT_DEFAULT / CGROUP_CPU_SHARES_DEFAULT,
506 CGROUP_WEIGHT_MIN, CGROUP_WEIGHT_MAX);
507}
508
509static uint64_t cgroup_cpu_weight_to_shares(uint64_t weight) {
510 return CLAMP(weight * CGROUP_CPU_SHARES_DEFAULT / CGROUP_WEIGHT_DEFAULT,
511 CGROUP_CPU_SHARES_MIN, CGROUP_CPU_SHARES_MAX);
512}
513
508c45da 514static bool cgroup_context_has_io_config(CGroupContext *c) {
538b4852
TH		 515 return c->io_accounting ||
516 c->io_weight != CGROUP_WEIGHT_INVALID ||
517 c->startup_io_weight != CGROUP_WEIGHT_INVALID ||
518 c->io_device_weights ||
519 c->io_device_limits;
520}
521
508c45da 522static bool cgroup_context_has_blockio_config(CGroupContext *c) {
538b4852
TH		 523 return c->blockio_accounting ||
524 c->blockio_weight != CGROUP_BLKIO_WEIGHT_INVALID ||
525 c->startup_blockio_weight != CGROUP_BLKIO_WEIGHT_INVALID ||
526 c->blockio_device_weights ||
527 c->blockio_device_bandwidths;
528}
529
508c45da 530static uint64_t cgroup_context_io_weight(CGroupContext *c, ManagerState state) {
64faf04c
TH		 531 if (IN_SET(state, MANAGER_STARTING, MANAGER_INITIALIZING) &&
532 c->startup_io_weight != CGROUP_WEIGHT_INVALID)
533 return c->startup_io_weight;
534 else if (c->io_weight != CGROUP_WEIGHT_INVALID)
535 return c->io_weight;
536 else
537 return CGROUP_WEIGHT_DEFAULT;
538}
539
508c45da 540static uint64_t cgroup_context_blkio_weight(CGroupContext *c, ManagerState state) {
64faf04c
TH		 541 if (IN_SET(state, MANAGER_STARTING, MANAGER_INITIALIZING) &&
542 c->startup_blockio_weight != CGROUP_BLKIO_WEIGHT_INVALID)
543 return c->startup_blockio_weight;
544 else if (c->blockio_weight != CGROUP_BLKIO_WEIGHT_INVALID)
545 return c->blockio_weight;
546 else
547 return CGROUP_BLKIO_WEIGHT_DEFAULT;
548}
549
508c45da 550static uint64_t cgroup_weight_blkio_to_io(uint64_t blkio_weight) {
538b4852
TH		 551 return CLAMP(blkio_weight * CGROUP_WEIGHT_DEFAULT / CGROUP_BLKIO_WEIGHT_DEFAULT,
552 CGROUP_WEIGHT_MIN, CGROUP_WEIGHT_MAX);
553}
554
508c45da 555static uint64_t cgroup_weight_io_to_blkio(uint64_t io_weight) {
538b4852
TH		 556 return CLAMP(io_weight * CGROUP_BLKIO_WEIGHT_DEFAULT / CGROUP_WEIGHT_DEFAULT,
557 CGROUP_BLKIO_WEIGHT_MIN, CGROUP_BLKIO_WEIGHT_MAX);
558}
559
f29ff115 560static void cgroup_apply_io_device_weight(Unit *u, const char *dev_path, uint64_t io_weight) {
64faf04c
TH		 561 char buf[DECIMAL_STR_MAX(dev_t)*2+2+DECIMAL_STR_MAX(uint64_t)+1];
562 dev_t dev;
563 int r;
564
565 r = lookup_block_device(dev_path, &dev);
566 if (r < 0)
567 return;
568
569 xsprintf(buf, "%u:%u %" PRIu64 "\n", major(dev), minor(dev), io_weight);
f29ff115 570 r = cg_set_attribute("io", u->cgroup_path, "io.weight", buf);
64faf04c 571 if (r < 0)
f29ff115
TH		 572 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
573 "Failed to set io.weight: %m");
64faf04c
TH		 574}
575
f29ff115 576static void cgroup_apply_blkio_device_weight(Unit *u, const char *dev_path, uint64_t blkio_weight) {
64faf04c
TH		 577 char buf[DECIMAL_STR_MAX(dev_t)*2+2+DECIMAL_STR_MAX(uint64_t)+1];
578 dev_t dev;
579 int r;
580
581 r = lookup_block_device(dev_path, &dev);
582 if (r < 0)
583 return;
584
585 xsprintf(buf, "%u:%u %" PRIu64 "\n", major(dev), minor(dev), blkio_weight);
f29ff115 586 r = cg_set_attribute("blkio", u->cgroup_path, "blkio.weight_device", buf);
64faf04c 587 if (r < 0)
f29ff115
TH		 588 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
589 "Failed to set blkio.weight_device: %m");
64faf04c
TH		 590}
591
f29ff115 592static unsigned cgroup_apply_io_device_limit(Unit *u, const char *dev_path, uint64_t *limits) {
64faf04c
TH		 593 char limit_bufs[_CGROUP_IO_LIMIT_TYPE_MAX][DECIMAL_STR_MAX(uint64_t)];
594 char buf[DECIMAL_STR_MAX(dev_t)*2+2+(6+DECIMAL_STR_MAX(uint64_t)+1)*4];
595 CGroupIOLimitType type;
596 dev_t dev;
597 unsigned n = 0;
598 int r;
599
600 r = lookup_block_device(dev_path, &dev);
601 if (r < 0)
602 return 0;
603
604 for (type = 0; type < _CGROUP_IO_LIMIT_TYPE_MAX; type++) {
605 if (limits[type] != cgroup_io_limit_defaults[type]) {
606 xsprintf(limit_bufs[type], "%" PRIu64, limits[type]);
607 n++;
608 } else {
609 xsprintf(limit_bufs[type], "%s", limits[type] == CGROUP_LIMIT_MAX ? "max" : "0");
610 }
611 }
612
613 xsprintf(buf, "%u:%u rbps=%s wbps=%s riops=%s wiops=%s\n", major(dev), minor(dev),
614 limit_bufs[CGROUP_IO_RBPS_MAX], limit_bufs[CGROUP_IO_WBPS_MAX],
615 limit_bufs[CGROUP_IO_RIOPS_MAX], limit_bufs[CGROUP_IO_WIOPS_MAX]);
f29ff115 616 r = cg_set_attribute("io", u->cgroup_path, "io.max", buf);
64faf04c 617 if (r < 0)
f29ff115
TH		 618 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
619 "Failed to set io.max: %m");
64faf04c
TH		 620 return n;
621}
622
f29ff115 623static unsigned cgroup_apply_blkio_device_limit(Unit *u, const char *dev_path, uint64_t rbps, uint64_t wbps) {
64faf04c
TH		 624 char buf[DECIMAL_STR_MAX(dev_t)*2+2+DECIMAL_STR_MAX(uint64_t)+1];
625 dev_t dev;
626 unsigned n = 0;
627 int r;
628
629 r = lookup_block_device(dev_path, &dev);
630 if (r < 0)
631 return 0;
632
633 if (rbps != CGROUP_LIMIT_MAX)
634 n++;
635 sprintf(buf, "%u:%u %" PRIu64 "\n", major(dev), minor(dev), rbps);
f29ff115 636 r = cg_set_attribute("blkio", u->cgroup_path, "blkio.throttle.read_bps_device", buf);
64faf04c 637 if (r < 0)
f29ff115
TH		 638 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
639 "Failed to set blkio.throttle.read_bps_device: %m");
64faf04c
TH		 640
641 if (wbps != CGROUP_LIMIT_MAX)
642 n++;
643 sprintf(buf, "%u:%u %" PRIu64 "\n", major(dev), minor(dev), wbps);
f29ff115 644 r = cg_set_attribute("blkio", u->cgroup_path, "blkio.throttle.write_bps_device", buf);
64faf04c 645 if (r < 0)
f29ff115
TH		 646 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
647 "Failed to set blkio.throttle.write_bps_device: %m");
64faf04c
TH		 648
649 return n;
650}
651
da4d897e 652static bool cgroup_context_has_unified_memory_config(CGroupContext *c) {
96e131ea 653 return c->memory_low > 0 || c->memory_high != CGROUP_LIMIT_MAX || c->memory_max != CGROUP_LIMIT_MAX || c->memory_swap_max != CGROUP_LIMIT_MAX;
da4d897e
TH		 654}
655
f29ff115 656static void cgroup_apply_unified_memory_limit(Unit *u, const char *file, uint64_t v) {
da4d897e
TH		 657 char buf[DECIMAL_STR_MAX(uint64_t) + 1] = "max";
658 int r;
659
660 if (v != CGROUP_LIMIT_MAX)
661 xsprintf(buf, "%" PRIu64 "\n", v);
662
f29ff115 663 r = cg_set_attribute("memory", u->cgroup_path, file, buf);
da4d897e 664 if (r < 0)
f29ff115
TH		 665 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
666 "Failed to set %s: %m", file);
da4d897e
TH		 667}
668
906c06f6
DM		 669static void cgroup_apply_firewall(Unit *u, CGroupContext *c) {
670 int r;
671
672 if (u->type == UNIT_SLICE) /* Skip this for slice units, they are inner cgroup nodes, and since bpf/cgroup is
673 * not recursive we don't ever touch the bpf on them */
674 return;
675
676 r = bpf_firewall_compile(u);
677 if (r < 0)
678 return;
679
680 (void) bpf_firewall_install(u);
681 return;
682}
683
684static void cgroup_context_apply(
685 Unit *u,
686 CGroupMask apply_mask,
687 bool apply_bpf,
688 ManagerState state) {
689
f29ff115
TH		 690 const char *path;
691 CGroupContext *c;
01efdf13 692 bool is_root;
4ad49000
LP		 693 int r;
694
f29ff115
TH		 695 assert(u);
696
697 c = unit_get_cgroup_context(u);
698 path = u->cgroup_path;
699
4ad49000
LP		 700 assert(c);
701 assert(path);
8e274523 702
906c06f6
DM		 703 /* Nothing to do? Exit early! */
704 if (apply_mask == 0 && !apply_bpf)
4ad49000 705 return;
8e274523 706
71c26873 707 /* Some cgroup attributes are not supported on the root cgroup,
01efdf13
LP		 708 * hence silently ignore */
709 is_root = isempty(path) || path_equal(path, "/");
6da13913
ZJS		 710 if (is_root)
711 /* Make sure we don't try to display messages with an empty path. */
712 path = "/";
01efdf13 713
714e2e1d
LP		 714 /* We generally ignore errors caused by read-only mounted
715 * cgroup trees (assuming we are running in a container then),
716 * and missing cgroups, i.e. EROFS and ENOENT. */
717
906c06f6
DM		 718 if ((apply_mask & CGROUP_MASK_CPU) && !is_root) {
719 bool has_weight, has_shares;
720
721 has_weight = cgroup_context_has_cpu_weight(c);
722 has_shares = cgroup_context_has_cpu_shares(c);
8e274523 723
b4cccbc1 724 if (cg_all_unified() > 0) {
66ebf6c0 725 uint64_t weight;
b2f8b02e 726
66ebf6c0
TH		 727 if (has_weight)
728 weight = cgroup_context_cpu_weight(c, state);
729 else if (has_shares) {
730 uint64_t shares = cgroup_context_cpu_shares(c, state);
b2f8b02e 731
66ebf6c0
TH		 732 weight = cgroup_cpu_shares_to_weight(shares);
733
734 log_cgroup_compat(u, "Applying [Startup]CpuShares %" PRIu64 " as [Startup]CpuWeight %" PRIu64 " on %s",
735 shares, weight, path);
736 } else
737 weight = CGROUP_WEIGHT_DEFAULT;
738
739 cgroup_apply_unified_cpu_config(u, weight, c->cpu_quota_per_sec_usec);
740 } else {
741 uint64_t shares;
742
7d862ab8 743 if (has_weight) {
66ebf6c0
TH		 744 uint64_t weight = cgroup_context_cpu_weight(c, state);
745
746 shares = cgroup_cpu_weight_to_shares(weight);
747
748 log_cgroup_compat(u, "Applying [Startup]CpuWeight %" PRIu64 " as [Startup]CpuShares %" PRIu64 " on %s",
749 weight, shares, path);
7d862ab8
TH		 750 } else if (has_shares)
751 shares = cgroup_context_cpu_shares(c, state);
752 else
66ebf6c0
TH		 753 shares = CGROUP_CPU_SHARES_DEFAULT;
754
755 cgroup_apply_legacy_cpu_config(u, shares, c->cpu_quota_per_sec_usec);
756 }
4ad49000
LP		 757 }
758
906c06f6 759 if (apply_mask & CGROUP_MASK_IO) {
538b4852
TH		 760 bool has_io = cgroup_context_has_io_config(c);
761 bool has_blockio = cgroup_context_has_blockio_config(c);
13c31542
TH		 762
763 if (!is_root) {
64faf04c
TH		 764 char buf[8+DECIMAL_STR_MAX(uint64_t)+1];
765 uint64_t weight;
13c31542 766
538b4852
TH		 767 if (has_io)
768 weight = cgroup_context_io_weight(c, state);
128fadc9
TH		 769 else if (has_blockio) {
770 uint64_t blkio_weight = cgroup_context_blkio_weight(c, state);
771
772 weight = cgroup_weight_blkio_to_io(blkio_weight);
773
774 log_cgroup_compat(u, "Applying [Startup]BlockIOWeight %" PRIu64 " as [Startup]IOWeight %" PRIu64,
775 blkio_weight, weight);
776 } else
538b4852 777 weight = CGROUP_WEIGHT_DEFAULT;
13c31542
TH		 778
779 xsprintf(buf, "default %" PRIu64 "\n", weight);
780 r = cg_set_attribute("io", path, "io.weight", buf);
781 if (r < 0)
f29ff115
TH		 782 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
783 "Failed to set io.weight: %m");
13c31542 784
538b4852
TH		 785 if (has_io) {
786 CGroupIODeviceWeight *w;
787
788 /* FIXME: no way to reset this list */
789 LIST_FOREACH(device_weights, w, c->io_device_weights)
f29ff115 790 cgroup_apply_io_device_weight(u, w->path, w->weight);
538b4852
TH		 791 } else if (has_blockio) {
792 CGroupBlockIODeviceWeight *w;
793
794 /* FIXME: no way to reset this list */
128fadc9
TH		 795 LIST_FOREACH(device_weights, w, c->blockio_device_weights) {
796 weight = cgroup_weight_blkio_to_io(w->weight);
797
798 log_cgroup_compat(u, "Applying BlockIODeviceWeight %" PRIu64 " as IODeviceWeight %" PRIu64 " for %s",
799 w->weight, weight, w->path);
800
801 cgroup_apply_io_device_weight(u, w->path, weight);
802 }
538b4852 803 }
13c31542
TH		 804 }
805
64faf04c 806 /* Apply limits and free ones without config. */
538b4852
TH		 807 if (has_io) {
808 CGroupIODeviceLimit *l, *next;
809
810 LIST_FOREACH_SAFE(device_limits, l, next, c->io_device_limits) {
f29ff115 811 if (!cgroup_apply_io_device_limit(u, l->path, l->limits))
538b4852
TH		 812 cgroup_context_free_io_device_limit(c, l);
813 }
814 } else if (has_blockio) {
815 CGroupBlockIODeviceBandwidth *b, *next;
816
817 LIST_FOREACH_SAFE(device_bandwidths, b, next, c->blockio_device_bandwidths) {
818 uint64_t limits[_CGROUP_IO_LIMIT_TYPE_MAX];
819 CGroupIOLimitType type;
820
821 for (type = 0; type < _CGROUP_IO_LIMIT_TYPE_MAX; type++)
822 limits[type] = cgroup_io_limit_defaults[type];
823
824 limits[CGROUP_IO_RBPS_MAX] = b->rbps;
825 limits[CGROUP_IO_WBPS_MAX] = b->wbps;
826
128fadc9
TH		 827 log_cgroup_compat(u, "Applying BlockIO{Read|Write}Bandwidth %" PRIu64 " %" PRIu64 " as IO{Read|Write}BandwidthMax for %s",
828 b->rbps, b->wbps, b->path);
829
f29ff115 830 if (!cgroup_apply_io_device_limit(u, b->path, limits))
538b4852
TH		 831 cgroup_context_free_blockio_device_bandwidth(c, b);
832 }
13c31542
TH		 833 }
834 }
835
906c06f6 836 if (apply_mask & CGROUP_MASK_BLKIO) {
538b4852
TH		 837 bool has_io = cgroup_context_has_io_config(c);
838 bool has_blockio = cgroup_context_has_blockio_config(c);
4ad49000 839
01efdf13 840 if (!is_root) {
64faf04c
TH		 841 char buf[DECIMAL_STR_MAX(uint64_t)+1];
842 uint64_t weight;
64faf04c 843
7d862ab8 844 if (has_io) {
128fadc9
TH		 845 uint64_t io_weight = cgroup_context_io_weight(c, state);
846
538b4852 847 weight = cgroup_weight_io_to_blkio(cgroup_context_io_weight(c, state));
128fadc9
TH		 848
849 log_cgroup_compat(u, "Applying [Startup]IOWeight %" PRIu64 " as [Startup]BlockIOWeight %" PRIu64,
850 io_weight, weight);
7d862ab8
TH		 851 } else if (has_blockio)
852 weight = cgroup_context_blkio_weight(c, state);
853 else
538b4852 854 weight = CGROUP_BLKIO_WEIGHT_DEFAULT;
64faf04c
TH		 855
856 xsprintf(buf, "%" PRIu64 "\n", weight);
01efdf13 857 r = cg_set_attribute("blkio", path, "blkio.weight", buf);
1aeab12b 858 if (r < 0)
f29ff115
TH		 859 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
860 "Failed to set blkio.weight: %m");
4ad49000 861
7d862ab8 862 if (has_io) {
538b4852
TH		 863 CGroupIODeviceWeight *w;
864
865 /* FIXME: no way to reset this list */
128fadc9
TH		 866 LIST_FOREACH(device_weights, w, c->io_device_weights) {
867 weight = cgroup_weight_io_to_blkio(w->weight);
868
869 log_cgroup_compat(u, "Applying IODeviceWeight %" PRIu64 " as BlockIODeviceWeight %" PRIu64 " for %s",
870 w->weight, weight, w->path);
871
872 cgroup_apply_blkio_device_weight(u, w->path, weight);
873 }
7d862ab8
TH		 874 } else if (has_blockio) {
875 CGroupBlockIODeviceWeight *w;
876
877 /* FIXME: no way to reset this list */
878 LIST_FOREACH(device_weights, w, c->blockio_device_weights)
879 cgroup_apply_blkio_device_weight(u, w->path, w->weight);
538b4852 880 }
4ad49000
LP		 881 }
882
64faf04c 883 /* Apply limits and free ones without config. */
7d862ab8 884 if (has_io) {
538b4852
TH		 885 CGroupIODeviceLimit *l, *next;
886
887 LIST_FOREACH_SAFE(device_limits, l, next, c->io_device_limits) {
128fadc9
TH		 888 log_cgroup_compat(u, "Applying IO{Read|Write}Bandwidth %" PRIu64 " %" PRIu64 " as BlockIO{Read|Write}BandwidthMax for %s",
889 l->limits[CGROUP_IO_RBPS_MAX], l->limits[CGROUP_IO_WBPS_MAX], l->path);
890
f29ff115 891 if (!cgroup_apply_blkio_device_limit(u, l->path, l->limits[CGROUP_IO_RBPS_MAX], l->limits[CGROUP_IO_WBPS_MAX]))
538b4852
TH		 892 cgroup_context_free_io_device_limit(c, l);
893 }
7d862ab8
TH		 894 } else if (has_blockio) {
895 CGroupBlockIODeviceBandwidth *b, *next;
896
897 LIST_FOREACH_SAFE(device_bandwidths, b, next, c->blockio_device_bandwidths)
898 if (!cgroup_apply_blkio_device_limit(u, b->path, b->rbps, b->wbps))
899 cgroup_context_free_blockio_device_bandwidth(c, b);
d686d8a9 900 }
8e274523
LP		 901 }
902
906c06f6 903 if ((apply_mask & CGROUP_MASK_MEMORY) && !is_root) {
b4cccbc1
LP		 904 if (cg_all_unified() > 0) {
905 uint64_t max, swap_max = CGROUP_LIMIT_MAX;
efdb0237 906
96e131ea 907 if (cgroup_context_has_unified_memory_config(c)) {
da4d897e 908 max = c->memory_max;
96e131ea
WC		 909 swap_max = c->memory_swap_max;
910 } else {
da4d897e 911 max = c->memory_limit;
efdb0237 912
128fadc9
TH		 913 if (max != CGROUP_LIMIT_MAX)
914 log_cgroup_compat(u, "Applying MemoryLimit %" PRIu64 " as MemoryMax", max);
915 }
916
f29ff115
TH		 917 cgroup_apply_unified_memory_limit(u, "memory.low", c->memory_low);
918 cgroup_apply_unified_memory_limit(u, "memory.high", c->memory_high);
919 cgroup_apply_unified_memory_limit(u, "memory.max", max);
96e131ea 920 cgroup_apply_unified_memory_limit(u, "memory.swap.max", swap_max);
efdb0237 921 } else {
da4d897e 922 char buf[DECIMAL_STR_MAX(uint64_t) + 1];
7d862ab8 923 uint64_t val;
da4d897e 924
7d862ab8 925 if (cgroup_context_has_unified_memory_config(c)) {
78a4ee59 926 val = c->memory_max;
7d862ab8
TH		 927 log_cgroup_compat(u, "Applying MemoryMax %" PRIi64 " as MemoryLimit", val);
928 } else
929 val = c->memory_limit;
128fadc9 930
78a4ee59
DM		 931 if (val == CGROUP_LIMIT_MAX)
932 strncpy(buf, "-1\n", sizeof(buf));
933 else
934 xsprintf(buf, "%" PRIu64 "\n", val);
935
da4d897e
TH		 936 r = cg_set_attribute("memory", path, "memory.limit_in_bytes", buf);
937 if (r < 0)
f29ff115
TH		 938 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
939 "Failed to set memory.limit_in_bytes: %m");
da4d897e 940 }
4ad49000 941 }
8e274523 942
906c06f6 943 if ((apply_mask & CGROUP_MASK_DEVICES) && !is_root) {
4ad49000 944 CGroupDeviceAllow *a;
8e274523 945
714e2e1d
LP		 946 /* Changing the devices list of a populated cgroup
947 * might result in EINVAL, hence ignore EINVAL
948 * here. */
949
4ad49000
LP		 950 if (c->device_allow || c->device_policy != CGROUP_AUTO)
951 r = cg_set_attribute("devices", path, "devices.deny", "a");
952 else
953 r = cg_set_attribute("devices", path, "devices.allow", "a");
1aeab12b 954 if (r < 0)
f29ff115
TH		 955 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EINVAL, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
956 "Failed to reset devices.list: %m");
fb385181 957
4ad49000
LP		 958 if (c->device_policy == CGROUP_CLOSED ||
959 (c->device_policy == CGROUP_AUTO && c->device_allow)) {
960 static const char auto_devices[] =
7d711efb
LP		 961 "/dev/null\0" "rwm\0"
962 "/dev/zero\0" "rwm\0"
963 "/dev/full\0" "rwm\0"
964 "/dev/random\0" "rwm\0"
965 "/dev/urandom\0" "rwm\0"
966 "/dev/tty\0" "rwm\0"
0d9e7991
AP		 967 "/dev/pts/ptmx\0" "rw\0" /* /dev/pts/ptmx may not be duplicated, but accessed */
968 /* Allow /run/systemd/inaccessible/{chr,blk} devices for mapping InaccessiblePaths */
e7330dfe
DP		 969 "-/run/systemd/inaccessible/chr\0" "rwm\0"
970 "-/run/systemd/inaccessible/blk\0" "rwm\0";
4ad49000
LP		 971
972 const char *x, *y;
973
974 NULSTR_FOREACH_PAIR(x, y, auto_devices)
975 whitelist_device(path, x, y);
7d711efb
LP		 976
977 whitelist_major(path, "pts", 'c', "rw");
4ad49000
LP		 978 }
979
980 LIST_FOREACH(device_allow, a, c->device_allow) {
fb4650aa 981 char acc[4], *val;
4ad49000
LP		 982 unsigned k = 0;
983
984 if (a->r)
985 acc[k++] = 'r';
986 if (a->w)
987 acc[k++] = 'w';
988 if (a->m)
989 acc[k++] = 'm';
fb385181 990
4ad49000
LP		 991 if (k == 0)
992 continue;
fb385181 993
4ad49000 994 acc[k++] = 0;
90060676 995
27458ed6 996 if (path_startswith(a->path, "/dev/"))
90060676 997 whitelist_device(path, a->path, acc);
fb4650aa
ZJS		 998 else if ((val = startswith(a->path, "block-")))
999 whitelist_major(path, val, 'b', acc);
1000 else if ((val = startswith(a->path, "char-")))
1001 whitelist_major(path, val, 'c', acc);
90060676 1002 else
f29ff115 1003 log_unit_debug(u, "Ignoring device %s while writing cgroup attribute.", a->path);
4ad49000
LP		 1004 }
1005 }
03a7b521 1006
906c06f6 1007 if ((apply_mask & CGROUP_MASK_PIDS) && !is_root) {
03a7b521 1008
f5058264 1009 if (c->tasks_max != CGROUP_LIMIT_MAX) {
03a7b521
LP		 1010 char buf[DECIMAL_STR_MAX(uint64_t) + 2];
1011
1012 sprintf(buf, "%" PRIu64 "\n", c->tasks_max);
1013 r = cg_set_attribute("pids", path, "pids.max", buf);
1014 } else
1015 r = cg_set_attribute("pids", path, "pids.max", "max");
1016
1017 if (r < 0)
f29ff115
TH		 1018 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
1019 "Failed to set pids.max: %m");
03a7b521 1020 }
906c06f6
DM		 1021
1022 if (apply_bpf)
1023 cgroup_apply_firewall(u, c);
fb385181
LP		 1024}
1025
efdb0237
LP		 1026CGroupMask cgroup_context_get_mask(CGroupContext *c) {
1027 CGroupMask mask = 0;
8e274523 1028
4ad49000 1029 /* Figure out which controllers we need */
8e274523 1030
b2f8b02e 1031 if (c->cpu_accounting ||
66ebf6c0
TH		 1032 cgroup_context_has_cpu_weight(c) ||
1033 cgroup_context_has_cpu_shares(c) ||
3a43da28 1034 c->cpu_quota_per_sec_usec != USEC_INFINITY)
efdb0237 1035 mask |= CGROUP_MASK_CPUACCT | CGROUP_MASK_CPU;
ecedd90f 1036
538b4852
TH		 1037 if (cgroup_context_has_io_config(c) || cgroup_context_has_blockio_config(c))
1038 mask |= CGROUP_MASK_IO | CGROUP_MASK_BLKIO;
ecedd90f 1039
4ad49000 1040 if (c->memory_accounting ||
da4d897e
TH		 1041 c->memory_limit != CGROUP_LIMIT_MAX ||
1042 cgroup_context_has_unified_memory_config(c))
efdb0237 1043 mask |= CGROUP_MASK_MEMORY;
8e274523 1044
a931ad47
LP		 1045 if (c->device_allow ||
1046 c->device_policy != CGROUP_AUTO)
3905f127 1047 mask |= CGROUP_MASK_DEVICES;
4ad49000 1048
03a7b521
LP		 1049 if (c->tasks_accounting ||
1050 c->tasks_max != (uint64_t) -1)
1051 mask |= CGROUP_MASK_PIDS;
1052
4ad49000 1053 return mask;
8e274523
LP		 1054}
1055
efdb0237 1056CGroupMask unit_get_own_mask(Unit *u) {
4ad49000 1057 CGroupContext *c;
8e274523 1058
efdb0237
LP		 1059 /* Returns the mask of controllers the unit needs for itself */
1060
4ad49000
LP		 1061 c = unit_get_cgroup_context(u);
1062 if (!c)
1063 return 0;
8e274523 1064
a931ad47 1065 /* If delegation is turned on, then turn on all cgroups,
19af675e
LP		 1066 * unless we are on the legacy hierarchy and the process we
1067 * fork into it is known to drop privileges, and hence
1068 * shouldn't get access to the controllers.
1069 *
1070 * Note that on the unified hierarchy it is safe to delegate
1071 * controllers to unprivileged services. */
a931ad47
LP		 1072
1073 if (c->delegate) {
1074 ExecContext *e;
1075
1076 e = unit_get_exec_context(u);
19af675e
LP		 1077 if (!e ||
1078 exec_context_maintains_privileges(e) ||
b4cccbc1 1079 cg_all_unified() > 0)
efdb0237 1080 return _CGROUP_MASK_ALL;
a931ad47
LP		 1081 }
1082
db785129 1083 return cgroup_context_get_mask(c);
8e274523
LP		 1084}
1085
efdb0237 1086CGroupMask unit_get_members_mask(Unit *u) {
4ad49000 1087 assert(u);
bc432dc7 1088
efdb0237
LP		 1089 /* Returns the mask of controllers all of the unit's children
1090 * require, merged */
1091
bc432dc7
LP		 1092 if (u->cgroup_members_mask_valid)
1093 return u->cgroup_members_mask;
1094
1095 u->cgroup_members_mask = 0;
1096
1097 if (u->type == UNIT_SLICE) {
1098 Unit *member;
1099 Iterator i;
1100
1101 SET_FOREACH(member, u->dependencies[UNIT_BEFORE], i) {
1102
1103 if (member == u)
1104 continue;
1105
d4fdc205 1106 if (UNIT_DEREF(member->slice) != u)
bc432dc7
LP		 1107 continue;
1108
1109 u->cgroup_members_mask |=
efdb0237 1110 unit_get_own_mask(member) |
bc432dc7
LP		 1111 unit_get_members_mask(member);
1112 }
1113 }
1114
1115 u->cgroup_members_mask_valid = true;
6414b7c9 1116 return u->cgroup_members_mask;
246aa6dd
LP		 1117}
1118
efdb0237 1119CGroupMask unit_get_siblings_mask(Unit *u) {
4ad49000 1120 assert(u);
246aa6dd 1121
efdb0237
LP		 1122 /* Returns the mask of controllers all of the unit's siblings
1123 * require, i.e. the members mask of the unit's parent slice
1124 * if there is one. */
1125
bc432dc7 1126 if (UNIT_ISSET(u->slice))
637f421e 1127 return unit_get_members_mask(UNIT_DEREF(u->slice));
4ad49000 1128
efdb0237 1129 return unit_get_own_mask(u) | unit_get_members_mask(u);
246aa6dd
LP		 1130}
1131
efdb0237
LP		 1132CGroupMask unit_get_subtree_mask(Unit *u) {
1133
1134 /* Returns the mask of this subtree, meaning of the group
1135 * itself and its children. */
1136
1137 return unit_get_own_mask(u) | unit_get_members_mask(u);
1138}
1139
1140CGroupMask unit_get_target_mask(Unit *u) {
1141 CGroupMask mask;
1142
1143 /* This returns the cgroup mask of all controllers to enable
1144 * for a specific cgroup, i.e. everything it needs itself,
1145 * plus all that its children need, plus all that its siblings
1146 * need. This is primarily useful on the legacy cgroup
1147 * hierarchy, where we need to duplicate each cgroup in each
1148 * hierarchy that shall be enabled for it. */
6414b7c9 1149
efdb0237
LP		 1150 mask = unit_get_own_mask(u) | unit_get_members_mask(u) | unit_get_siblings_mask(u);
1151 mask &= u->manager->cgroup_supported;
1152
1153 return mask;
1154}
1155
1156CGroupMask unit_get_enable_mask(Unit *u) {
1157 CGroupMask mask;
1158
1159 /* This returns the cgroup mask of all controllers to enable
1160 * for the children of a specific cgroup. This is primarily
1161 * useful for the unified cgroup hierarchy, where each cgroup
1162 * controls which controllers are enabled for its children. */
1163
1164 mask = unit_get_members_mask(u);
6414b7c9
DS		 1165 mask &= u->manager->cgroup_supported;
1166
1167 return mask;
1168}
1169
906c06f6
DM		 1170bool unit_get_needs_bpf(Unit *u) {
1171 CGroupContext *c;
1172 Unit *p;
1173 assert(u);
1174
1175 /* We never attach BPF to slice units, as they are inner cgroup nodes and cgroup/BPF is not recursive at the
1176 * moment. */
1177 if (u->type == UNIT_SLICE)
1178 return false;
1179
1180 c = unit_get_cgroup_context(u);
1181 if (!c)
1182 return false;
1183
1184 if (c->ip_accounting ||
1185 c->ip_address_allow ||
1186 c->ip_address_deny)
1187 return true;
1188
1189 /* If any parent slice has an IP access list defined, it applies too */
1190 for (p = UNIT_DEREF(u->slice); p; p = UNIT_DEREF(p->slice)) {
1191 c = unit_get_cgroup_context(p);
1192 if (!c)
1193 return false;
1194
1195 if (c->ip_address_allow ||
1196 c->ip_address_deny)
1197 return true;
1198 }
1199
1200 return false;
1201}
1202
6414b7c9
DS		 1203/* Recurse from a unit up through its containing slices, propagating
1204 * mask bits upward. A unit is also member of itself. */
bc432dc7 1205void unit_update_cgroup_members_masks(Unit *u) {
efdb0237 1206 CGroupMask m;
bc432dc7
LP		 1207 bool more;
1208
1209 assert(u);
1210
1211 /* Calculate subtree mask */
efdb0237 1212 m = unit_get_subtree_mask(u);
bc432dc7
LP		 1213
1214 /* See if anything changed from the previous invocation. If
1215 * not, we're done. */
1216 if (u->cgroup_subtree_mask_valid && m == u->cgroup_subtree_mask)
1217 return;
1218
1219 more =
1220 u->cgroup_subtree_mask_valid &&
1221 ((m & ~u->cgroup_subtree_mask) != 0) &&
1222 ((~m & u->cgroup_subtree_mask) == 0);
1223
1224 u->cgroup_subtree_mask = m;
1225 u->cgroup_subtree_mask_valid = true;
1226
6414b7c9
DS		 1227 if (UNIT_ISSET(u->slice)) {
1228 Unit *s = UNIT_DEREF(u->slice);
bc432dc7
LP		 1229
1230 if (more)
1231 /* There's more set now than before. We
1232 * propagate the new mask to the parent's mask
1233 * (not caring if it actually was valid or
1234 * not). */
1235
1236 s->cgroup_members_mask |= m;
1237
1238 else
1239 /* There's less set now than before (or we
1240 * don't know), we need to recalculate
1241 * everything, so let's invalidate the
1242 * parent's members mask */
1243
1244 s->cgroup_members_mask_valid = false;
1245
1246 /* And now make sure that this change also hits our
1247 * grandparents */
1248 unit_update_cgroup_members_masks(s);
6414b7c9
DS		 1249 }
1250}
1251
efdb0237 1252static const char *migrate_callback(CGroupMask mask, void *userdata) {
03b90d4b
LP		 1253 Unit *u = userdata;
1254
1255 assert(mask != 0);
1256 assert(u);
1257
1258 while (u) {
1259 if (u->cgroup_path &&
1260 u->cgroup_realized &&
1261 (u->cgroup_realized_mask & mask) == mask)
1262 return u->cgroup_path;
1263
1264 u = UNIT_DEREF(u->slice);
1265 }
1266
1267 return NULL;
1268}
1269
efdb0237
LP		 1270char *unit_default_cgroup_path(Unit *u) {
1271 _cleanup_free_ char *escaped = NULL, *slice = NULL;
1272 int r;
1273
1274 assert(u);
1275
1276 if (unit_has_name(u, SPECIAL_ROOT_SLICE))
1277 return strdup(u->manager->cgroup_root);
1278
1279 if (UNIT_ISSET(u->slice) && !unit_has_name(UNIT_DEREF(u->slice), SPECIAL_ROOT_SLICE)) {
1280 r = cg_slice_to_path(UNIT_DEREF(u->slice)->id, &slice);
1281 if (r < 0)
1282 return NULL;
1283 }
1284
1285 escaped = cg_escape(u->id);
1286 if (!escaped)
1287 return NULL;
1288
1289 if (slice)
605405c6
ZJS		 1290 return strjoin(u->manager->cgroup_root, "/", slice, "/",
1291 escaped);
efdb0237 1292 else
605405c6 1293 return strjoin(u->manager->cgroup_root, "/", escaped);
efdb0237
LP		 1294}
1295
1296int unit_set_cgroup_path(Unit *u, const char *path) {
1297 _cleanup_free_ char *p = NULL;
1298 int r;
1299
1300 assert(u);
1301
1302 if (path) {
1303 p = strdup(path);
1304 if (!p)
1305 return -ENOMEM;
1306 } else
1307 p = NULL;
1308
1309 if (streq_ptr(u->cgroup_path, p))
1310 return 0;
1311
1312 if (p) {
1313 r = hashmap_put(u->manager->cgroup_unit, p, u);
1314 if (r < 0)
1315 return r;
1316 }
1317
1318 unit_release_cgroup(u);
1319
1320 u->cgroup_path = p;
1321 p = NULL;
1322
1323 return 1;
1324}
1325
1326int unit_watch_cgroup(Unit *u) {
ab2c3861 1327 _cleanup_free_ char *events = NULL;
efdb0237
LP		 1328 int r;
1329
1330 assert(u);
1331
1332 if (!u->cgroup_path)
1333 return 0;
1334
1335 if (u->cgroup_inotify_wd >= 0)
1336 return 0;
1337
1338 /* Only applies to the unified hierarchy */
c22800e4 1339 r = cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER);
b4cccbc1
LP		 1340 if (r < 0)
1341 return log_error_errno(r, "Failed to determine whether the name=systemd hierarchy is unified: %m");
1342 if (r == 0)
efdb0237
LP		 1343 return 0;
1344
1345 /* Don't watch the root slice, it's pointless. */
1346 if (unit_has_name(u, SPECIAL_ROOT_SLICE))
1347 return 0;
1348
1349 r = hashmap_ensure_allocated(&u->manager->cgroup_inotify_wd_unit, &trivial_hash_ops);
1350 if (r < 0)
1351 return log_oom();
1352
ab2c3861 1353 r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, "cgroup.events", &events);
efdb0237
LP		 1354 if (r < 0)
1355 return log_oom();
1356
ab2c3861 1357 u->cgroup_inotify_wd = inotify_add_watch(u->manager->cgroup_inotify_fd, events, IN_MODIFY);
efdb0237
LP		 1358 if (u->cgroup_inotify_wd < 0) {
1359
1360 if (errno == ENOENT) /* If the directory is already
1361 * gone we don't need to track
1362 * it, so this is not an error */
1363 return 0;
1364
1365 return log_unit_error_errno(u, errno, "Failed to add inotify watch descriptor for control group %s: %m", u->cgroup_path);
1366 }
1367
1368 r = hashmap_put(u->manager->cgroup_inotify_wd_unit, INT_TO_PTR(u->cgroup_inotify_wd), u);
1369 if (r < 0)
1370 return log_unit_error_errno(u, r, "Failed to add inotify watch descriptor to hash map: %m");
1371
1372 return 0;
1373}
1374
1375static int unit_create_cgroup(
1376 Unit *u,
1377 CGroupMask target_mask,
906c06f6
DM		 1378 CGroupMask enable_mask,
1379 bool needs_bpf) {
efdb0237 1380
0cd385d3 1381 CGroupContext *c;
bc432dc7 1382 int r;
64747e2d 1383
4ad49000 1384 assert(u);
64747e2d 1385
0cd385d3
LP		 1386 c = unit_get_cgroup_context(u);
1387 if (!c)
1388 return 0;
1389
7b3fd631
LP		 1390 if (!u->cgroup_path) {
1391 _cleanup_free_ char *path = NULL;
64747e2d 1392
7b3fd631
LP		 1393 path = unit_default_cgroup_path(u);
1394 if (!path)
1395 return log_oom();
1396
efdb0237
LP		 1397 r = unit_set_cgroup_path(u, path);
1398 if (r == -EEXIST)
1399 return log_unit_error_errno(u, r, "Control group %s exists already.", path);
1400 if (r < 0)
1401 return log_unit_error_errno(u, r, "Failed to set unit's control group path to %s: %m", path);
b58b8e11
HH		 1402 }
1403
03b90d4b 1404 /* First, create our own group */
efdb0237 1405 r = cg_create_everywhere(u->manager->cgroup_supported, target_mask, u->cgroup_path);
23bbb0de 1406 if (r < 0)
efdb0237
LP		 1407 return log_unit_error_errno(u, r, "Failed to create cgroup %s: %m", u->cgroup_path);
1408
1409 /* Start watching it */
1410 (void) unit_watch_cgroup(u);
1411
1412 /* Enable all controllers we need */
1413 r = cg_enable_everywhere(u->manager->cgroup_supported, enable_mask, u->cgroup_path);
1414 if (r < 0)
1415 log_unit_warning_errno(u, r, "Failed to enable controllers on cgroup %s, ignoring: %m", u->cgroup_path);
03b90d4b
LP		 1416
1417 /* Keep track that this is now realized */
4ad49000 1418 u->cgroup_realized = true;
efdb0237 1419 u->cgroup_realized_mask = target_mask;
ccf78df1 1420 u->cgroup_enabled_mask = enable_mask;
906c06f6 1421 u->cgroup_bpf_state = needs_bpf ? UNIT_CGROUP_BPF_ON : UNIT_CGROUP_BPF_OFF;
4ad49000 1422
0cd385d3
LP		 1423 if (u->type != UNIT_SLICE && !c->delegate) {
1424
1425 /* Then, possibly move things over, but not if
1426 * subgroups may contain processes, which is the case
1427 * for slice and delegation units. */
1428 r = cg_migrate_everywhere(u->manager->cgroup_supported, u->cgroup_path, u->cgroup_path, migrate_callback, u);
1429 if (r < 0)
efdb0237 1430 log_unit_warning_errno(u, r, "Failed to migrate cgroup from to %s, ignoring: %m", u->cgroup_path);
0cd385d3 1431 }
03b90d4b 1432
64747e2d
LP		 1433 return 0;
1434}
1435
7b3fd631
LP		 1436int unit_attach_pids_to_cgroup(Unit *u) {
1437 int r;
1438 assert(u);
1439
1440 r = unit_realize_cgroup(u);
1441 if (r < 0)
1442 return r;
1443
1444 r = cg_attach_many_everywhere(u->manager->cgroup_supported, u->cgroup_path, u->pids, migrate_callback, u);
1445 if (r < 0)
1446 return r;
1447
1448 return 0;
1449}
1450
4b58153d
LP		 1451static void cgroup_xattr_apply(Unit *u) {
1452 char ids[SD_ID128_STRING_MAX];
1453 int r;
1454
1455 assert(u);
1456
1457 if (!MANAGER_IS_SYSTEM(u->manager))
1458 return;
1459
1460 if (sd_id128_is_null(u->invocation_id))
1461 return;
1462
1463 r = cg_set_xattr(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path,
1464 "trusted.invocation_id",
1465 sd_id128_to_string(u->invocation_id, ids), 32,
1466 0);
1467 if (r < 0)
1468 log_unit_warning_errno(u, r, "Failed to set invocation ID on control group %s, ignoring: %m", u->cgroup_path);
1469}
1470
906c06f6
DM		 1471static bool unit_has_mask_realized(
1472 Unit *u,
1473 CGroupMask target_mask,
1474 CGroupMask enable_mask,
1475 bool needs_bpf) {
1476
bc432dc7
LP		 1477 assert(u);
1478
906c06f6
DM		 1479 return u->cgroup_realized &&
1480 u->cgroup_realized_mask == target_mask &&
1481 u->cgroup_enabled_mask == enable_mask &&
1482 ((needs_bpf && u->cgroup_bpf_state == UNIT_CGROUP_BPF_ON) ||
1483 (!needs_bpf && u->cgroup_bpf_state == UNIT_CGROUP_BPF_OFF));
6414b7c9
DS		 1484}
1485
1486/* Check if necessary controllers and attributes for a unit are in place.
1487 *
1488 * If so, do nothing.
1489 * If not, create paths, move processes over, and set attributes.
1490 *
1491 * Returns 0 on success and < 0 on failure. */
db785129 1492static int unit_realize_cgroup_now(Unit *u, ManagerState state) {
efdb0237 1493 CGroupMask target_mask, enable_mask;
906c06f6 1494 bool needs_bpf, apply_bpf;
6414b7c9 1495 int r;
64747e2d 1496
4ad49000 1497 assert(u);
64747e2d 1498
4ad49000 1499 if (u->in_cgroup_queue) {
71fda00f 1500 LIST_REMOVE(cgroup_queue, u->manager->cgroup_queue, u);
4ad49000
LP		 1501 u->in_cgroup_queue = false;
1502 }
64747e2d 1503
efdb0237 1504 target_mask = unit_get_target_mask(u);
ccf78df1 1505 enable_mask = unit_get_enable_mask(u);
906c06f6 1506 needs_bpf = unit_get_needs_bpf(u);
ccf78df1 1507
906c06f6 1508 if (unit_has_mask_realized(u, target_mask, enable_mask, needs_bpf))
0a1eb06d 1509 return 0;
64747e2d 1510
906c06f6
DM		 1511 /* Make sure we apply the BPF filters either when one is configured, or if none is configured but previously
1512 * the state was anything but off. This way, if a unit with a BPF filter applied is reconfigured to lose it
1513 * this will trickle down properly to cgroupfs. */
1514 apply_bpf = needs_bpf || u->cgroup_bpf_state != UNIT_CGROUP_BPF_OFF;
1515
4ad49000 1516 /* First, realize parents */
6414b7c9 1517 if (UNIT_ISSET(u->slice)) {
db785129 1518 r = unit_realize_cgroup_now(UNIT_DEREF(u->slice), state);
6414b7c9
DS		 1519 if (r < 0)
1520 return r;
1521 }
4ad49000
LP		 1522
1523 /* And then do the real work */
906c06f6 1524 r = unit_create_cgroup(u, target_mask, enable_mask, needs_bpf);
6414b7c9
DS		 1525 if (r < 0)
1526 return r;
1527
1528 /* Finally, apply the necessary attributes. */
906c06f6 1529 cgroup_context_apply(u, target_mask, apply_bpf, state);
4b58153d 1530 cgroup_xattr_apply(u);
6414b7c9
DS		 1531
1532 return 0;
64747e2d
LP		 1533}
1534
4ad49000 1535static void unit_add_to_cgroup_queue(Unit *u) {
58d83430 1536 assert(u);
ecedd90f 1537
4ad49000
LP		 1538 if (u->in_cgroup_queue)
1539 return;
8e274523 1540
71fda00f 1541 LIST_PREPEND(cgroup_queue, u->manager->cgroup_queue, u);
4ad49000
LP		 1542 u->in_cgroup_queue = true;
1543}
8c6db833 1544
4ad49000 1545unsigned manager_dispatch_cgroup_queue(Manager *m) {
db785129 1546 ManagerState state;
4ad49000 1547 unsigned n = 0;
db785129 1548 Unit *i;
6414b7c9 1549 int r;
ecedd90f 1550
db785129
LP		 1551 state = manager_state(m);
1552
4ad49000
LP		 1553 while ((i = m->cgroup_queue)) {
1554 assert(i->in_cgroup_queue);
ecedd90f 1555
db785129 1556 r = unit_realize_cgroup_now(i, state);
6414b7c9 1557 if (r < 0)
efdb0237 1558 log_warning_errno(r, "Failed to realize cgroups for queued unit %s, ignoring: %m", i->id);
0a1eb06d 1559
4ad49000
LP		 1560 n++;
1561 }
ecedd90f 1562
4ad49000 1563 return n;
8e274523
LP		 1564}
1565
4ad49000
LP		 1566static void unit_queue_siblings(Unit *u) {
1567 Unit *slice;
ca949c9d 1568
4ad49000
LP		 1569 /* This adds the siblings of the specified unit and the
1570 * siblings of all parent units to the cgroup queue. (But
1571 * neither the specified unit itself nor the parents.) */
1572
1573 while ((slice = UNIT_DEREF(u->slice))) {
1574 Iterator i;
1575 Unit *m;
8f53a7b8 1576
4ad49000
LP		 1577 SET_FOREACH(m, slice->dependencies[UNIT_BEFORE], i) {
1578 if (m == u)
1579 continue;
8e274523 1580
6414b7c9
DS		 1581 /* Skip units that have a dependency on the slice
1582 * but aren't actually in it. */
4ad49000 1583 if (UNIT_DEREF(m->slice) != slice)
50159e6a 1584 continue;
8e274523 1585
6414b7c9
DS		 1586 /* No point in doing cgroup application for units
1587 * without active processes. */
1588 if (UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(m)))
1589 continue;
1590
1591 /* If the unit doesn't need any new controllers
1592 * and has current ones realized, it doesn't need
1593 * any changes. */
906c06f6
DM		 1594 if (unit_has_mask_realized(m,
1595 unit_get_target_mask(m),
1596 unit_get_enable_mask(m),
1597 unit_get_needs_bpf(m)))
6414b7c9
DS		 1598 continue;
1599
4ad49000 1600 unit_add_to_cgroup_queue(m);
50159e6a
LP		 1601 }
1602
4ad49000 1603 u = slice;
8e274523 1604 }
4ad49000
LP		 1605}
1606
0a1eb06d 1607int unit_realize_cgroup(Unit *u) {
4ad49000
LP		 1608 assert(u);
1609
35b7ff80 1610 if (!UNIT_HAS_CGROUP_CONTEXT(u))
0a1eb06d 1611 return 0;
8e274523 1612
4ad49000
LP		 1613 /* So, here's the deal: when realizing the cgroups for this
1614 * unit, we need to first create all parents, but there's more
1615 * actually: for the weight-based controllers we also need to
1616 * make sure that all our siblings (i.e. units that are in the
73e231ab 1617 * same slice as we are) have cgroups, too. Otherwise, things
4ad49000
LP		 1618 * would become very uneven as each of their processes would
1619 * get as much resources as all our group together. This call
1620 * will synchronously create the parent cgroups, but will
1621 * defer work on the siblings to the next event loop
1622 * iteration. */
ca949c9d 1623
4ad49000
LP		 1624 /* Add all sibling slices to the cgroup queue. */
1625 unit_queue_siblings(u);
1626
6414b7c9 1627 /* And realize this one now (and apply the values) */
db785129 1628 return unit_realize_cgroup_now(u, manager_state(u->manager));
8e274523
LP		 1629}
1630
efdb0237
LP		 1631void unit_release_cgroup(Unit *u) {
1632 assert(u);
1633
1634 /* Forgets all cgroup details for this cgroup */
1635
1636 if (u->cgroup_path) {
1637 (void) hashmap_remove(u->manager->cgroup_unit, u->cgroup_path);
1638 u->cgroup_path = mfree(u->cgroup_path);
1639 }
1640
1641 if (u->cgroup_inotify_wd >= 0) {
1642 if (inotify_rm_watch(u->manager->cgroup_inotify_fd, u->cgroup_inotify_wd) < 0)
1643 log_unit_debug_errno(u, errno, "Failed to remove cgroup inotify watch %i for %s, ignoring", u->cgroup_inotify_wd, u->id);
1644
1645 (void) hashmap_remove(u->manager->cgroup_inotify_wd_unit, INT_TO_PTR(u->cgroup_inotify_wd));
1646 u->cgroup_inotify_wd = -1;
1647 }
1648}
1649
1650void unit_prune_cgroup(Unit *u) {
8e274523 1651 int r;
efdb0237 1652 bool is_root_slice;
8e274523 1653
4ad49000 1654 assert(u);
8e274523 1655
efdb0237
LP		 1656 /* Removes the cgroup, if empty and possible, and stops watching it. */
1657
4ad49000
LP		 1658 if (!u->cgroup_path)
1659 return;
8e274523 1660
fe700f46
LP		 1661 (void) unit_get_cpu_usage(u, NULL); /* Cache the last CPU usage value before we destroy the cgroup */
1662
efdb0237
LP		 1663 is_root_slice = unit_has_name(u, SPECIAL_ROOT_SLICE);
1664
1665 r = cg_trim_everywhere(u->manager->cgroup_supported, u->cgroup_path, !is_root_slice);
dab5bf85 1666 if (r < 0) {
f29ff115 1667 log_unit_debug_errno(u, r, "Failed to destroy cgroup %s, ignoring: %m", u->cgroup_path);
dab5bf85
RL		 1668 return;
1669 }
8e274523 1670
efdb0237
LP		 1671 if (is_root_slice)
1672 return;
1673
1674 unit_release_cgroup(u);
0a1eb06d 1675
4ad49000 1676 u->cgroup_realized = false;
bc432dc7 1677 u->cgroup_realized_mask = 0;
ccf78df1 1678 u->cgroup_enabled_mask = 0;
8e274523
LP		 1679}
1680
efdb0237 1681int unit_search_main_pid(Unit *u, pid_t *ret) {
4ad49000
LP		 1682 _cleanup_fclose_ FILE *f = NULL;
1683 pid_t pid = 0, npid, mypid;
efdb0237 1684 int r;
4ad49000
LP		 1685
1686 assert(u);
efdb0237 1687 assert(ret);
4ad49000
LP		 1688
1689 if (!u->cgroup_path)
efdb0237 1690 return -ENXIO;
4ad49000 1691
efdb0237
LP		 1692 r = cg_enumerate_processes(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, &f);
1693 if (r < 0)
1694 return r;
4ad49000 1695
df0ff127 1696 mypid = getpid_cached();
4ad49000
LP		 1697 while (cg_read_pid(f, &npid) > 0) {
1698 pid_t ppid;
1699
1700 if (npid == pid)
1701 continue;
8e274523 1702
4ad49000 1703 /* Ignore processes that aren't our kids */
6bc73acb 1704 if (get_process_ppid(npid, &ppid) >= 0 && ppid != mypid)
4ad49000 1705 continue;
8e274523 1706
efdb0237 1707 if (pid != 0)
4ad49000
LP		 1708 /* Dang, there's more than one daemonized PID
1709 in this group, so we don't know what process
1710 is the main process. */
efdb0237
LP		 1711
1712 return -ENODATA;
8e274523 1713
4ad49000 1714 pid = npid;
8e274523
LP		 1715 }
1716
efdb0237
LP		 1717 *ret = pid;
1718 return 0;
1719}
1720
1721static int unit_watch_pids_in_path(Unit *u, const char *path) {
b3c5bad3 1722 _cleanup_closedir_ DIR *d = NULL;
efdb0237
LP		 1723 _cleanup_fclose_ FILE *f = NULL;
1724 int ret = 0, r;
1725
1726 assert(u);
1727 assert(path);
1728
1729 r = cg_enumerate_processes(SYSTEMD_CGROUP_CONTROLLER, path, &f);
1730 if (r < 0)
1731 ret = r;
1732 else {
1733 pid_t pid;
1734
1735 while ((r = cg_read_pid(f, &pid)) > 0) {
1736 r = unit_watch_pid(u, pid);
1737 if (r < 0 && ret >= 0)
1738 ret = r;
1739 }
1740
1741 if (r < 0 && ret >= 0)
1742 ret = r;
1743 }
1744
1745 r = cg_enumerate_subgroups(SYSTEMD_CGROUP_CONTROLLER, path, &d);
1746 if (r < 0) {
1747 if (ret >= 0)
1748 ret = r;
1749 } else {
1750 char *fn;
1751
1752 while ((r = cg_read_subgroup(d, &fn)) > 0) {
1753 _cleanup_free_ char *p = NULL;
1754
605405c6 1755 p = strjoin(path, "/", fn);
efdb0237
LP		 1756 free(fn);
1757
1758 if (!p)
1759 return -ENOMEM;
1760
1761 r = unit_watch_pids_in_path(u, p);
1762 if (r < 0 && ret >= 0)
1763 ret = r;
1764 }
1765
1766 if (r < 0 && ret >= 0)
1767 ret = r;
1768 }
1769
1770 return ret;
1771}
1772
1773int unit_watch_all_pids(Unit *u) {
b4cccbc1
LP		 1774 int r;
1775
efdb0237
LP		 1776 assert(u);
1777
1778 /* Adds all PIDs from our cgroup to the set of PIDs we
1779 * watch. This is a fallback logic for cases where we do not
1780 * get reliable cgroup empty notifications: we try to use
1781 * SIGCHLD as replacement. */
1782
1783 if (!u->cgroup_path)
1784 return -ENOENT;
1785
c22800e4 1786 r = cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER);
b4cccbc1
LP		 1787 if (r < 0)
1788 return r;
1789 if (r > 0) /* On unified we can use proper notifications */
efdb0237
LP		 1790 return 0;
1791
1792 return unit_watch_pids_in_path(u, u->cgroup_path);
1793}
1794
1795int unit_notify_cgroup_empty(Unit *u) {
1796 int r;
1797
1798 assert(u);
1799
1800 if (!u->cgroup_path)
1801 return 0;
1802
1803 r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path);
1804 if (r <= 0)
1805 return r;
1806
1807 unit_add_to_gc_queue(u);
1808
1809 if (UNIT_VTABLE(u)->notify_cgroup_empty)
1810 UNIT_VTABLE(u)->notify_cgroup_empty(u);
1811
1812 return 0;
1813}
1814
1815static int on_cgroup_inotify_event(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
1816 Manager *m = userdata;
1817
1818 assert(s);
1819 assert(fd >= 0);
1820 assert(m);
1821
1822 for (;;) {
1823 union inotify_event_buffer buffer;
1824 struct inotify_event *e;
1825 ssize_t l;
1826
1827 l = read(fd, &buffer, sizeof(buffer));
1828 if (l < 0) {
1829 if (errno == EINTR || errno == EAGAIN)
1830 return 0;
1831
1832 return log_error_errno(errno, "Failed to read control group inotify events: %m");
1833 }
1834
1835 FOREACH_INOTIFY_EVENT(e, buffer, l) {
1836 Unit *u;
1837
1838 if (e->wd < 0)
1839 /* Queue overflow has no watch descriptor */
1840 continue;
1841
1842 if (e->mask & IN_IGNORED)
1843 /* The watch was just removed */
1844 continue;
1845
1846 u = hashmap_get(m->cgroup_inotify_wd_unit, INT_TO_PTR(e->wd));
1847 if (!u) /* Not that inotify might deliver
1848 * events for a watch even after it
1849 * was removed, because it was queued
1850 * before the removal. Let's ignore
1851 * this here safely. */
1852 continue;
1853
1854 (void) unit_notify_cgroup_empty(u);
1855 }
1856 }
8e274523
LP		 1857}
1858
8e274523 1859int manager_setup_cgroup(Manager *m) {
9444b1f2 1860 _cleanup_free_ char *path = NULL;
10bd3e2e 1861 const char *scope_path;
efdb0237 1862 CGroupController c;
b4cccbc1 1863 int r, all_unified;
efdb0237 1864 char *e;
8e274523
LP		 1865
1866 assert(m);
1867
35d2e7ec 1868 /* 1. Determine hierarchy */
efdb0237 1869 m->cgroup_root = mfree(m->cgroup_root);
9444b1f2 1870 r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 0, &m->cgroup_root);
23bbb0de
MS		 1871 if (r < 0)
1872 return log_error_errno(r, "Cannot determine cgroup we are running in: %m");
8e274523 1873
efdb0237
LP		 1874 /* Chop off the init scope, if we are already located in it */
1875 e = endswith(m->cgroup_root, "/" SPECIAL_INIT_SCOPE);
0d8c31ff 1876
efdb0237
LP		 1877 /* LEGACY: Also chop off the system slice if we are in
1878 * it. This is to support live upgrades from older systemd
1879 * versions where PID 1 was moved there. Also see
1880 * cg_get_root_path(). */
463d0d15 1881 if (!e && MANAGER_IS_SYSTEM(m)) {
9444b1f2 1882 e = endswith(m->cgroup_root, "/" SPECIAL_SYSTEM_SLICE);
15c60e99 1883 if (!e)
efdb0237 1884 e = endswith(m->cgroup_root, "/system"); /* even more legacy */
0baf24dd 1885 }
efdb0237
LP		 1886 if (e)
1887 *e = 0;
7ccfb64a 1888
9444b1f2
LP		 1889 /* And make sure to store away the root value without trailing
1890 * slash, even for the root dir, so that we can easily prepend
1891 * it everywhere. */
efdb0237
LP		 1892 while ((e = endswith(m->cgroup_root, "/")))
1893 *e = 0;
8e274523 1894
35d2e7ec 1895 /* 2. Show data */
9444b1f2 1896 r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, NULL, &path);
23bbb0de
MS		 1897 if (r < 0)
1898 return log_error_errno(r, "Cannot find cgroup mount point: %m");
8e274523 1899
415fc41c
TH		 1900 r = cg_unified_flush();
1901 if (r < 0)
1902 return log_error_errno(r, "Couldn't determine if we are running in the unified hierarchy: %m");
5da38d07 1903
b4cccbc1
LP		 1904 all_unified = cg_all_unified();
1905 if (r < 0)
1906 return log_error_errno(r, "Couldn't determine whether we are in all unified mode: %m");
1907 if (r > 0)
efdb0237 1908 log_debug("Unified cgroup hierarchy is located at %s.", path);
b4cccbc1 1909 else {
c22800e4 1910 r = cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER);
b4cccbc1
LP		 1911 if (r < 0)
1912 return log_error_errno(r, "Failed to determine whether systemd's own controller is in unified mode: %m");
1913 if (r > 0)
1914 log_debug("Unified cgroup hierarchy is located at %s. Controllers are on legacy hierarchies.", path);
1915 else
1916 log_debug("Using cgroup controller " SYSTEMD_CGROUP_CONTROLLER_LEGACY ". File system hierarchy is at %s.", path);
1917 }
efdb0237 1918
10bd3e2e
LP		 1919 /* 3. Install agent */
1920 if (cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER) > 0) {
c6c18be3 1921
10bd3e2e
LP		 1922 /* In the unified hierarchy we can get
1923 * cgroup empty notifications via inotify. */
efdb0237 1924
10bd3e2e
LP		 1925 m->cgroup_inotify_event_source = sd_event_source_unref(m->cgroup_inotify_event_source);
1926 safe_close(m->cgroup_inotify_fd);
efdb0237 1927
10bd3e2e
LP		 1928 m->cgroup_inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC);
1929 if (m->cgroup_inotify_fd < 0)
1930 return log_error_errno(errno, "Failed to create control group inotify object: %m");
efdb0237 1931
10bd3e2e
LP		 1932 r = sd_event_add_io(m->event, &m->cgroup_inotify_event_source, m->cgroup_inotify_fd, EPOLLIN, on_cgroup_inotify_event, m);
1933 if (r < 0)
1934 return log_error_errno(r, "Failed to watch control group inotify object: %m");
efdb0237 1935
10bd3e2e
LP		 1936 /* Process cgroup empty notifications early, but after service notifications and SIGCHLD. Also
1937 * see handling of cgroup agent notifications, for the classic cgroup hierarchy support. */
1938 r = sd_event_source_set_priority(m->cgroup_inotify_event_source, SD_EVENT_PRIORITY_NORMAL-5);
1939 if (r < 0)
1940 return log_error_errno(r, "Failed to set priority of inotify event source: %m");
efdb0237 1941
10bd3e2e 1942 (void) sd_event_source_set_description(m->cgroup_inotify_event_source, "cgroup-inotify");
efdb0237 1943
10bd3e2e 1944 } else if (MANAGER_IS_SYSTEM(m) && m->test_run_flags == 0) {
efdb0237 1945
10bd3e2e
LP		 1946 /* On the legacy hierarchy we only get notifications via cgroup agents. (Which isn't really reliable,
1947 * since it does not generate events when control groups with children run empty. */
8e274523 1948
10bd3e2e 1949 r = cg_install_release_agent(SYSTEMD_CGROUP_CONTROLLER, SYSTEMD_CGROUP_AGENT_PATH);
23bbb0de 1950 if (r < 0)
10bd3e2e
LP		 1951 log_warning_errno(r, "Failed to install release agent, ignoring: %m");
1952 else if (r > 0)
1953 log_debug("Installed release agent.");
1954 else if (r == 0)
1955 log_debug("Release agent already installed.");
1956 }
efdb0237 1957
10bd3e2e
LP		 1958 /* 4. Make sure we are in the special "init.scope" unit in the root slice. */
1959 scope_path = strjoina(m->cgroup_root, "/" SPECIAL_INIT_SCOPE);
1960 r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, scope_path, 0);
1961 if (r < 0)
1962 return log_error_errno(r, "Failed to create %s control group: %m", scope_path);
c6c18be3 1963
10bd3e2e
LP		 1964 /* also, move all other userspace processes remaining
1965 * in the root cgroup into that scope. */
1966 r = cg_migrate(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, SYSTEMD_CGROUP_CONTROLLER, scope_path, 0);
1967 if (r < 0)
1968 log_warning_errno(r, "Couldn't move remaining userspace processes, ignoring: %m");
0d8c31ff 1969
10bd3e2e
LP		 1970 /* 5. And pin it, so that it cannot be unmounted */
1971 safe_close(m->pin_cgroupfs_fd);
1972 m->pin_cgroupfs_fd = open(path, O_RDONLY|O_CLOEXEC|O_DIRECTORY|O_NOCTTY|O_NONBLOCK);
1973 if (m->pin_cgroupfs_fd < 0)
1974 return log_error_errno(errno, "Failed to open pin file: %m");
1975
1976 /* 6. Always enable hierarchical support if it exists... */
1977 if (!all_unified && m->test_run_flags == 0)
1978 (void) cg_set_attribute("memory", "/", "memory.use_hierarchy", "1");
c6c18be3 1979
0d8c31ff 1980 /* 7. Figure out which controllers are supported */
efdb0237
LP		 1981 r = cg_mask_supported(&m->cgroup_supported);
1982 if (r < 0)
1983 return log_error_errno(r, "Failed to determine supported controllers: %m");
1984
1985 for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++)
eee0a1e4 1986 log_debug("Controller '%s' supported: %s", cgroup_controller_to_string(c), yes_no(m->cgroup_supported & CGROUP_CONTROLLER_TO_MASK(c)));
9156e799 1987
a32360f1 1988 return 0;
8e274523
LP		 1989}
1990
c6c18be3 1991void manager_shutdown_cgroup(Manager *m, bool delete) {
8e274523
LP		 1992 assert(m);
1993
9444b1f2
LP		 1994 /* We can't really delete the group, since we are in it. But
1995 * let's trim it. */
1996 if (delete && m->cgroup_root)
efdb0237
LP		 1997 (void) cg_trim(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, false);
1998
1999 m->cgroup_inotify_wd_unit = hashmap_free(m->cgroup_inotify_wd_unit);
2000
2001 m->cgroup_inotify_event_source = sd_event_source_unref(m->cgroup_inotify_event_source);
2002 m->cgroup_inotify_fd = safe_close(m->cgroup_inotify_fd);
8e274523 2003
03e334a1 2004 m->pin_cgroupfs_fd = safe_close(m->pin_cgroupfs_fd);
c6c18be3 2005
efdb0237 2006 m->cgroup_root = mfree(m->cgroup_root);
8e274523
LP		 2007}
2008
4ad49000 2009Unit* manager_get_unit_by_cgroup(Manager *m, const char *cgroup) {
acb14d31 2010 char *p;
4ad49000 2011 Unit *u;
acb14d31
LP		 2012
2013 assert(m);
2014 assert(cgroup);
acb14d31 2015
4ad49000
LP		 2016 u = hashmap_get(m->cgroup_unit, cgroup);
2017 if (u)
2018 return u;
acb14d31 2019
8e70580b 2020 p = strdupa(cgroup);
acb14d31
LP		 2021 for (;;) {
2022 char *e;
2023
2024 e = strrchr(p, '/');
efdb0237
LP		 2025 if (!e || e == p)
2026 return hashmap_get(m->cgroup_unit, SPECIAL_ROOT_SLICE);
acb14d31
LP		 2027
2028 *e = 0;
2029
4ad49000
LP		 2030 u = hashmap_get(m->cgroup_unit, p);
2031 if (u)
2032 return u;
acb14d31
LP		 2033 }
2034}
2035
b3ac818b 2036Unit *manager_get_unit_by_pid_cgroup(Manager *m, pid_t pid) {
4ad49000 2037 _cleanup_free_ char *cgroup = NULL;
acb14d31 2038 int r;
8e274523 2039
8c47c732
LP		 2040 assert(m);
2041
b3ac818b
LP		 2042 if (pid <= 0)
2043 return NULL;
2044
2045 r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, pid, &cgroup);
2046 if (r < 0)
2047 return NULL;
2048
2049 return manager_get_unit_by_cgroup(m, cgroup);
2050}
2051
2052Unit *manager_get_unit_by_pid(Manager *m, pid_t pid) {
2053 Unit *u;
2054
2055 assert(m);
2056
efdb0237 2057 if (pid <= 0)
8c47c732
LP		 2058 return NULL;
2059
efdb0237
LP		 2060 if (pid == 1)
2061 return hashmap_get(m->units, SPECIAL_INIT_SCOPE);
2062
fea72cc0 2063 u = hashmap_get(m->watch_pids1, PID_TO_PTR(pid));
5fe8876b
LP		 2064 if (u)
2065 return u;
2066
fea72cc0 2067 u = hashmap_get(m->watch_pids2, PID_TO_PTR(pid));
5fe8876b
LP		 2068 if (u)
2069 return u;
2070
b3ac818b 2071 return manager_get_unit_by_pid_cgroup(m, pid);
6dde1f33 2072}
4fbf50b3 2073
4ad49000
LP		 2074int manager_notify_cgroup_empty(Manager *m, const char *cgroup) {
2075 Unit *u;
4fbf50b3 2076
4ad49000
LP		 2077 assert(m);
2078 assert(cgroup);
4fbf50b3 2079
d8fdc620
LP		 2080 log_debug("Got cgroup empty notification for: %s", cgroup);
2081
4ad49000 2082 u = manager_get_unit_by_cgroup(m, cgroup);
5ad096b3
LP		 2083 if (!u)
2084 return 0;
b56c28c3 2085
efdb0237 2086 return unit_notify_cgroup_empty(u);
5ad096b3
LP		 2087}
2088
2089int unit_get_memory_current(Unit *u, uint64_t *ret) {
2090 _cleanup_free_ char *v = NULL;
2091 int r;
2092
2093 assert(u);
2094 assert(ret);
2095
2e4025c0 2096 if (!UNIT_CGROUP_BOOL(u, memory_accounting))
cf3b4be1
LP		 2097 return -ENODATA;
2098
5ad096b3
LP		 2099 if (!u->cgroup_path)
2100 return -ENODATA;
2101
efdb0237 2102 if ((u->cgroup_realized_mask & CGROUP_MASK_MEMORY) == 0)
5ad096b3
LP		 2103 return -ENODATA;
2104
b4cccbc1
LP		 2105 r = cg_all_unified();
2106 if (r < 0)
2107 return r;
2108 if (r > 0)
efdb0237 2109 r = cg_get_attribute("memory", u->cgroup_path, "memory.current", &v);
b4cccbc1
LP		 2110 else
2111 r = cg_get_attribute("memory", u->cgroup_path, "memory.usage_in_bytes", &v);
5ad096b3
LP		 2112 if (r == -ENOENT)
2113 return -ENODATA;
2114 if (r < 0)
2115 return r;
2116
2117 return safe_atou64(v, ret);
2118}
2119
03a7b521
LP		 2120int unit_get_tasks_current(Unit *u, uint64_t *ret) {
2121 _cleanup_free_ char *v = NULL;
2122 int r;
2123
2124 assert(u);
2125 assert(ret);
2126
2e4025c0 2127 if (!UNIT_CGROUP_BOOL(u, tasks_accounting))
cf3b4be1
LP		 2128 return -ENODATA;
2129
03a7b521
LP		 2130 if (!u->cgroup_path)
2131 return -ENODATA;
2132
2133 if ((u->cgroup_realized_mask & CGROUP_MASK_PIDS) == 0)
2134 return -ENODATA;
2135
2136 r = cg_get_attribute("pids", u->cgroup_path, "pids.current", &v);
2137 if (r == -ENOENT)
2138 return -ENODATA;
2139 if (r < 0)
2140 return r;
2141
2142 return safe_atou64(v, ret);
2143}
2144
5ad096b3
LP		 2145static int unit_get_cpu_usage_raw(Unit *u, nsec_t *ret) {
2146 _cleanup_free_ char *v = NULL;
2147 uint64_t ns;
2148 int r;
2149
2150 assert(u);
2151 assert(ret);
2152
2153 if (!u->cgroup_path)
2154 return -ENODATA;
2155
b4cccbc1
LP		 2156 r = cg_all_unified();
2157 if (r < 0)
2158 return r;
2159 if (r > 0) {
66ebf6c0
TH		 2160 const char *keys[] = { "usage_usec", NULL };
2161 _cleanup_free_ char *val = NULL;
2162 uint64_t us;
5ad096b3 2163
66ebf6c0
TH		 2164 if ((u->cgroup_realized_mask & CGROUP_MASK_CPU) == 0)
2165 return -ENODATA;
5ad096b3 2166
66ebf6c0
TH		 2167 r = cg_get_keyed_attribute("cpu", u->cgroup_path, "cpu.stat", keys, &val);
2168 if (r < 0)
2169 return r;
2170
2171 r = safe_atou64(val, &us);
2172 if (r < 0)
2173 return r;
2174
2175 ns = us * NSEC_PER_USEC;
2176 } else {
2177 if ((u->cgroup_realized_mask & CGROUP_MASK_CPUACCT) == 0)
2178 return -ENODATA;
2179
2180 r = cg_get_attribute("cpuacct", u->cgroup_path, "cpuacct.usage", &v);
2181 if (r == -ENOENT)
2182 return -ENODATA;
2183 if (r < 0)
2184 return r;
2185
2186 r = safe_atou64(v, &ns);
2187 if (r < 0)
2188 return r;
2189 }
5ad096b3
LP		 2190
2191 *ret = ns;
2192 return 0;
2193}
2194
2195int unit_get_cpu_usage(Unit *u, nsec_t *ret) {
2196 nsec_t ns;
2197 int r;
2198
fe700f46
LP		 2199 assert(u);
2200
2201 /* Retrieve the current CPU usage counter. This will subtract the CPU counter taken when the unit was
2202 * started. If the cgroup has been removed already, returns the last cached value. To cache the value, simply
2203 * call this function with a NULL return value. */
2204
2e4025c0 2205 if (!UNIT_CGROUP_BOOL(u, cpu_accounting))
cf3b4be1
LP		 2206 return -ENODATA;
2207
5ad096b3 2208 r = unit_get_cpu_usage_raw(u, &ns);
fe700f46
LP		 2209 if (r == -ENODATA && u->cpu_usage_last != NSEC_INFINITY) {
2210 /* If we can't get the CPU usage anymore (because the cgroup was already removed, for example), use our
2211 * cached value. */
2212
2213 if (ret)
2214 *ret = u->cpu_usage_last;
2215 return 0;
2216 }
5ad096b3
LP		 2217 if (r < 0)
2218 return r;
2219
66ebf6c0
TH		 2220 if (ns > u->cpu_usage_base)
2221 ns -= u->cpu_usage_base;
5ad096b3
LP		 2222 else
2223 ns = 0;
2224
fe700f46
LP		 2225 u->cpu_usage_last = ns;
2226 if (ret)
2227 *ret = ns;
2228
5ad096b3
LP		 2229 return 0;
2230}
2231
906c06f6
DM		 2232int unit_get_ip_accounting(
2233 Unit *u,
2234 CGroupIPAccountingMetric metric,
2235 uint64_t *ret) {
2236
6b659ed8 2237 uint64_t value;
906c06f6
DM		 2238 int fd, r;
2239
2240 assert(u);
2241 assert(metric >= 0);
2242 assert(metric < _CGROUP_IP_ACCOUNTING_METRIC_MAX);
2243 assert(ret);
2244
cf3b4be1
LP		 2245 /* IP accounting is currently not recursive, and hence we refuse to return any data for slice nodes. Slices are
2246 * inner cgroup nodes and hence have no processes directly attached, hence their counters would be zero
2247 * anyway. And if we block this now we can later open this up, if the kernel learns recursive BPF cgroup
2248 * filters. */
2249 if (u->type == UNIT_SLICE)
2250 return -ENODATA;
2251
2e4025c0 2252 if (!UNIT_CGROUP_BOOL(u, ip_accounting))
cf3b4be1
LP		 2253 return -ENODATA;
2254
906c06f6
DM		 2255 fd = IN_SET(metric, CGROUP_IP_INGRESS_BYTES, CGROUP_IP_INGRESS_PACKETS) ?
2256 u->ip_accounting_ingress_map_fd :
2257 u->ip_accounting_egress_map_fd;
2258
2259 if (fd < 0)
2260 return -ENODATA;
2261
2262 if (IN_SET(metric, CGROUP_IP_INGRESS_BYTES, CGROUP_IP_EGRESS_BYTES))
6b659ed8 2263 r = bpf_firewall_read_accounting(fd, &value, NULL);
906c06f6 2264 else
6b659ed8
LP		 2265 r = bpf_firewall_read_accounting(fd, NULL, &value);
2266 if (r < 0)
2267 return r;
2268
2269 /* Add in additional metrics from a previous runtime. Note that when reexecing/reloading the daemon we compile
2270 * all BPF programs and maps anew, but serialize the old counters. When deserializing we store them in the
2271 * ip_accounting_extra[] field, and add them in here transparently. */
2272
2273 *ret = value + u->ip_accounting_extra[metric];
906c06f6
DM		 2274
2275 return r;
2276}
2277
2278int unit_reset_cpu_accounting(Unit *u) {
5ad096b3
LP		 2279 nsec_t ns;
2280 int r;
2281
2282 assert(u);
2283
fe700f46
LP		 2284 u->cpu_usage_last = NSEC_INFINITY;
2285
5ad096b3
LP		 2286 r = unit_get_cpu_usage_raw(u, &ns);
2287 if (r < 0) {
66ebf6c0 2288 u->cpu_usage_base = 0;
5ad096b3 2289 return r;
b56c28c3 2290 }
2633eb83 2291
66ebf6c0 2292 u->cpu_usage_base = ns;
4ad49000 2293 return 0;
4fbf50b3
LP		 2294}
2295
906c06f6
DM		 2296int unit_reset_ip_accounting(Unit *u) {
2297 int r = 0, q = 0;
2298
2299 assert(u);
2300
2301 if (u->ip_accounting_ingress_map_fd >= 0)
2302 r = bpf_firewall_reset_accounting(u->ip_accounting_ingress_map_fd);
2303
2304 if (u->ip_accounting_egress_map_fd >= 0)
2305 q = bpf_firewall_reset_accounting(u->ip_accounting_egress_map_fd);
2306
6b659ed8
LP		 2307 zero(u->ip_accounting_extra);
2308
906c06f6
DM		 2309 return r < 0 ? r : q;
2310}
2311
e7ab4d1a
LP		 2312void unit_invalidate_cgroup(Unit *u, CGroupMask m) {
2313 assert(u);
2314
2315 if (!UNIT_HAS_CGROUP_CONTEXT(u))
2316 return;
2317
2318 if (m == 0)
2319 return;
2320
538b4852
TH		 2321 /* always invalidate compat pairs together */
2322 if (m & (CGROUP_MASK_IO | CGROUP_MASK_BLKIO))
2323 m |= CGROUP_MASK_IO | CGROUP_MASK_BLKIO;
2324
7cce4fb7
LP		 2325 if (m & (CGROUP_MASK_CPU | CGROUP_MASK_CPUACCT))
2326 m |= CGROUP_MASK_CPU | CGROUP_MASK_CPUACCT;
2327
e7ab4d1a
LP		 2328 if ((u->cgroup_realized_mask & m) == 0)
2329 return;
2330
2331 u->cgroup_realized_mask &= ~m;
2332 unit_add_to_cgroup_queue(u);
2333}
2334
906c06f6
DM		 2335void unit_invalidate_cgroup_bpf(Unit *u) {
2336 assert(u);
2337
2338 if (!UNIT_HAS_CGROUP_CONTEXT(u))
2339 return;
2340
2341 if (u->cgroup_bpf_state == UNIT_CGROUP_BPF_INVALIDATED)
2342 return;
2343
2344 u->cgroup_bpf_state = UNIT_CGROUP_BPF_INVALIDATED;
2345 unit_add_to_cgroup_queue(u);
2346
2347 /* If we are a slice unit, we also need to put compile a new BPF program for all our children, as the IP access
2348 * list of our children includes our own. */
2349 if (u->type == UNIT_SLICE) {
2350 Unit *member;
2351 Iterator i;
2352
2353 SET_FOREACH(member, u->dependencies[UNIT_BEFORE], i) {
2354 if (member == u)
2355 continue;
2356
2357 if (UNIT_DEREF(member->slice) != u)
2358 continue;
2359
2360 unit_invalidate_cgroup_bpf(member);
2361 }
2362 }
2363}
2364
e7ab4d1a
LP		 2365void manager_invalidate_startup_units(Manager *m) {
2366 Iterator i;
2367 Unit *u;
2368
2369 assert(m);
2370
2371 SET_FOREACH(u, m->startup_units, i)
13c31542 2372 unit_invalidate_cgroup(u, CGROUP_MASK_CPU|CGROUP_MASK_IO|CGROUP_MASK_BLKIO);
e7ab4d1a
LP		 2373}
2374
4ad49000
LP		 2375static const char* const cgroup_device_policy_table[_CGROUP_DEVICE_POLICY_MAX] = {
2376 [CGROUP_AUTO] = "auto",
2377 [CGROUP_CLOSED] = "closed",
2378 [CGROUP_STRICT] = "strict",
2379};
4fbf50b3 2380
4ad49000 2381DEFINE_STRING_TABLE_LOOKUP(cgroup_device_policy, CGroupDevicePolicy);
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