2 This file is part of systemd.
4 Copyright 2013 Lennart Poettering
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.
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.
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/>.
23 #include "alloc-util.h"
24 //#include "bpf-firewall.h"
25 #include "cgroup-util.h"
30 #include "parse-util.h"
31 #include "path-util.h"
32 #include "process-util.h"
33 //#include "special.h"
34 #include "stdio-util.h"
35 #include "string-table.h"
36 #include "string-util.h"
38 #define CGROUP_CPU_QUOTA_PERIOD_USEC ((usec_t) 100 * USEC_PER_MSEC)
40 #if 0 /// UNNEEDED by elogind
41 static void cgroup_compat_warn(void) {
42 static bool cgroup_compat_warned = false;
44 if (cgroup_compat_warned)
47 log_warning("cgroup compatibility translation between legacy and unified hierarchy settings activated. See cgroup-compat debug messages for details.");
48 cgroup_compat_warned = true;
51 #define log_cgroup_compat(unit, fmt, ...) do { \
52 cgroup_compat_warn(); \
53 log_unit_debug(unit, "cgroup-compat: " fmt, ##__VA_ARGS__); \
56 void cgroup_context_init(CGroupContext *c) {
59 /* Initialize everything to the kernel defaults, assuming the
60 * structure is preinitialized to 0 */
62 c->cpu_weight = CGROUP_WEIGHT_INVALID;
63 c->startup_cpu_weight = CGROUP_WEIGHT_INVALID;
64 c->cpu_quota_per_sec_usec = USEC_INFINITY;
66 c->cpu_shares = CGROUP_CPU_SHARES_INVALID;
67 c->startup_cpu_shares = CGROUP_CPU_SHARES_INVALID;
69 c->memory_high = CGROUP_LIMIT_MAX;
70 c->memory_max = CGROUP_LIMIT_MAX;
71 c->memory_swap_max = CGROUP_LIMIT_MAX;
73 c->memory_limit = CGROUP_LIMIT_MAX;
75 c->io_weight = CGROUP_WEIGHT_INVALID;
76 c->startup_io_weight = CGROUP_WEIGHT_INVALID;
78 c->blockio_weight = CGROUP_BLKIO_WEIGHT_INVALID;
79 c->startup_blockio_weight = CGROUP_BLKIO_WEIGHT_INVALID;
81 c->tasks_max = (uint64_t) -1;
84 void cgroup_context_free_device_allow(CGroupContext *c, CGroupDeviceAllow *a) {
88 LIST_REMOVE(device_allow, c->device_allow, a);
93 void cgroup_context_free_io_device_weight(CGroupContext *c, CGroupIODeviceWeight *w) {
97 LIST_REMOVE(device_weights, c->io_device_weights, w);
102 void cgroup_context_free_io_device_limit(CGroupContext *c, CGroupIODeviceLimit *l) {
106 LIST_REMOVE(device_limits, c->io_device_limits, l);
111 void cgroup_context_free_blockio_device_weight(CGroupContext *c, CGroupBlockIODeviceWeight *w) {
115 LIST_REMOVE(device_weights, c->blockio_device_weights, w);
120 void cgroup_context_free_blockio_device_bandwidth(CGroupContext *c, CGroupBlockIODeviceBandwidth *b) {
124 LIST_REMOVE(device_bandwidths, c->blockio_device_bandwidths, b);
129 void cgroup_context_done(CGroupContext *c) {
132 while (c->io_device_weights)
133 cgroup_context_free_io_device_weight(c, c->io_device_weights);
135 while (c->io_device_limits)
136 cgroup_context_free_io_device_limit(c, c->io_device_limits);
138 while (c->blockio_device_weights)
139 cgroup_context_free_blockio_device_weight(c, c->blockio_device_weights);
141 while (c->blockio_device_bandwidths)
142 cgroup_context_free_blockio_device_bandwidth(c, c->blockio_device_bandwidths);
144 while (c->device_allow)
145 cgroup_context_free_device_allow(c, c->device_allow);
147 c->ip_address_allow = ip_address_access_free_all(c->ip_address_allow);
148 c->ip_address_deny = ip_address_access_free_all(c->ip_address_deny);
151 void cgroup_context_dump(CGroupContext *c, FILE* f, const char *prefix) {
152 CGroupIODeviceLimit *il;
153 CGroupIODeviceWeight *iw;
154 CGroupBlockIODeviceBandwidth *b;
155 CGroupBlockIODeviceWeight *w;
156 CGroupDeviceAllow *a;
157 IPAddressAccessItem *iaai;
158 char u[FORMAT_TIMESPAN_MAX];
163 prefix = strempty(prefix);
166 "%sCPUAccounting=%s\n"
167 "%sIOAccounting=%s\n"
168 "%sBlockIOAccounting=%s\n"
169 "%sMemoryAccounting=%s\n"
170 "%sTasksAccounting=%s\n"
171 "%sIPAccounting=%s\n"
172 "%sCPUWeight=%" PRIu64 "\n"
173 "%sStartupCPUWeight=%" PRIu64 "\n"
174 "%sCPUShares=%" PRIu64 "\n"
175 "%sStartupCPUShares=%" PRIu64 "\n"
176 "%sCPUQuotaPerSecSec=%s\n"
177 "%sIOWeight=%" PRIu64 "\n"
178 "%sStartupIOWeight=%" PRIu64 "\n"
179 "%sBlockIOWeight=%" PRIu64 "\n"
180 "%sStartupBlockIOWeight=%" PRIu64 "\n"
181 "%sMemoryLow=%" PRIu64 "\n"
182 "%sMemoryHigh=%" PRIu64 "\n"
183 "%sMemoryMax=%" PRIu64 "\n"
184 "%sMemorySwapMax=%" PRIu64 "\n"
185 "%sMemoryLimit=%" PRIu64 "\n"
186 "%sTasksMax=%" PRIu64 "\n"
187 "%sDevicePolicy=%s\n"
189 prefix, yes_no(c->cpu_accounting),
190 prefix, yes_no(c->io_accounting),
191 prefix, yes_no(c->blockio_accounting),
192 prefix, yes_no(c->memory_accounting),
193 prefix, yes_no(c->tasks_accounting),
194 prefix, yes_no(c->ip_accounting),
195 prefix, c->cpu_weight,
196 prefix, c->startup_cpu_weight,
197 prefix, c->cpu_shares,
198 prefix, c->startup_cpu_shares,
199 prefix, format_timespan(u, sizeof(u), c->cpu_quota_per_sec_usec, 1),
200 prefix, c->io_weight,
201 prefix, c->startup_io_weight,
202 prefix, c->blockio_weight,
203 prefix, c->startup_blockio_weight,
204 prefix, c->memory_low,
205 prefix, c->memory_high,
206 prefix, c->memory_max,
207 prefix, c->memory_swap_max,
208 prefix, c->memory_limit,
209 prefix, c->tasks_max,
210 prefix, cgroup_device_policy_to_string(c->device_policy),
211 prefix, yes_no(c->delegate));
214 _cleanup_free_ char *t = NULL;
216 (void) cg_mask_to_string(c->delegate_controllers, &t);
218 fprintf(f, "%sDelegateControllers=%s\n",
223 LIST_FOREACH(device_allow, a, c->device_allow)
225 "%sDeviceAllow=%s %s%s%s\n",
228 a->r ? "r" : "", a->w ? "w" : "", a->m ? "m" : "");
230 LIST_FOREACH(device_weights, iw, c->io_device_weights)
232 "%sIODeviceWeight=%s %" PRIu64,
237 LIST_FOREACH(device_limits, il, c->io_device_limits) {
238 char buf[FORMAT_BYTES_MAX];
239 CGroupIOLimitType type;
241 for (type = 0; type < _CGROUP_IO_LIMIT_TYPE_MAX; type++)
242 if (il->limits[type] != cgroup_io_limit_defaults[type])
246 cgroup_io_limit_type_to_string(type),
248 format_bytes(buf, sizeof(buf), il->limits[type]));
251 LIST_FOREACH(device_weights, w, c->blockio_device_weights)
253 "%sBlockIODeviceWeight=%s %" PRIu64,
258 LIST_FOREACH(device_bandwidths, b, c->blockio_device_bandwidths) {
259 char buf[FORMAT_BYTES_MAX];
261 if (b->rbps != CGROUP_LIMIT_MAX)
263 "%sBlockIOReadBandwidth=%s %s\n",
266 format_bytes(buf, sizeof(buf), b->rbps));
267 if (b->wbps != CGROUP_LIMIT_MAX)
269 "%sBlockIOWriteBandwidth=%s %s\n",
272 format_bytes(buf, sizeof(buf), b->wbps));
275 LIST_FOREACH(items, iaai, c->ip_address_allow) {
276 _cleanup_free_ char *k = NULL;
278 (void) in_addr_to_string(iaai->family, &iaai->address, &k);
279 fprintf(f, "%sIPAddressAllow=%s/%u\n", prefix, strnull(k), iaai->prefixlen);
282 LIST_FOREACH(items, iaai, c->ip_address_deny) {
283 _cleanup_free_ char *k = NULL;
285 (void) in_addr_to_string(iaai->family, &iaai->address, &k);
286 fprintf(f, "%sIPAddressDeny=%s/%u\n", prefix, strnull(k), iaai->prefixlen);
290 static int lookup_block_device(const char *p, dev_t *dev) {
299 return log_warning_errno(errno, "Couldn't stat device %s: %m", p);
301 if (S_ISBLK(st.st_mode))
303 else if (major(st.st_dev) != 0) {
304 /* If this is not a device node then find the block
305 * device this file is stored on */
308 /* If this is a partition, try to get the originating
310 block_get_whole_disk(*dev, dev);
312 log_warning("%s is not a block device and file system block device cannot be determined or is not local.", p);
319 static int whitelist_device(const char *path, const char *node, const char *acc) {
320 char buf[2+DECIMAL_STR_MAX(dev_t)*2+2+4];
322 bool ignore_notfound;
328 if (node[0] == '-') {
329 /* Non-existent paths starting with "-" must be silently ignored */
331 ignore_notfound = true;
333 ignore_notfound = false;
335 if (stat(node, &st) < 0) {
336 if (errno == ENOENT && ignore_notfound)
339 return log_warning_errno(errno, "Couldn't stat device %s: %m", node);
342 if (!S_ISCHR(st.st_mode) && !S_ISBLK(st.st_mode)) {
343 log_warning("%s is not a device.", node);
349 S_ISCHR(st.st_mode) ? 'c' : 'b',
350 major(st.st_rdev), minor(st.st_rdev),
353 r = cg_set_attribute("devices", path, "devices.allow", buf);
355 log_full_errno(IN_SET(r, -ENOENT, -EROFS, -EINVAL, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
356 "Failed to set devices.allow on %s: %m", path);
361 static int whitelist_major(const char *path, const char *name, char type, const char *acc) {
362 _cleanup_fclose_ FILE *f = NULL;
369 assert(IN_SET(type, 'b', 'c'));
371 f = fopen("/proc/devices", "re");
373 return log_warning_errno(errno, "Cannot open /proc/devices to resolve %s (%c): %m", name, type);
375 FOREACH_LINE(line, f, goto fail) {
376 char buf[2+DECIMAL_STR_MAX(unsigned)+3+4], *p, *w;
381 if (type == 'c' && streq(line, "Character devices:")) {
386 if (type == 'b' && streq(line, "Block devices:")) {
401 w = strpbrk(p, WHITESPACE);
406 r = safe_atou(p, &maj);
413 w += strspn(w, WHITESPACE);
415 if (fnmatch(name, w, 0) != 0)
424 r = cg_set_attribute("devices", path, "devices.allow", buf);
426 log_full_errno(IN_SET(r, -ENOENT, -EROFS, -EINVAL, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
427 "Failed to set devices.allow on %s: %m", path);
433 return log_warning_errno(errno, "Failed to read /proc/devices: %m");
436 static bool cgroup_context_has_cpu_weight(CGroupContext *c) {
437 return c->cpu_weight != CGROUP_WEIGHT_INVALID ||
438 c->startup_cpu_weight != CGROUP_WEIGHT_INVALID;
441 static bool cgroup_context_has_cpu_shares(CGroupContext *c) {
442 return c->cpu_shares != CGROUP_CPU_SHARES_INVALID ||
443 c->startup_cpu_shares != CGROUP_CPU_SHARES_INVALID;
446 static uint64_t cgroup_context_cpu_weight(CGroupContext *c, ManagerState state) {
447 if (IN_SET(state, MANAGER_STARTING, MANAGER_INITIALIZING) &&
448 c->startup_cpu_weight != CGROUP_WEIGHT_INVALID)
449 return c->startup_cpu_weight;
450 else if (c->cpu_weight != CGROUP_WEIGHT_INVALID)
451 return c->cpu_weight;
453 return CGROUP_WEIGHT_DEFAULT;
456 static uint64_t cgroup_context_cpu_shares(CGroupContext *c, ManagerState state) {
457 if (IN_SET(state, MANAGER_STARTING, MANAGER_INITIALIZING) &&
458 c->startup_cpu_shares != CGROUP_CPU_SHARES_INVALID)
459 return c->startup_cpu_shares;
460 else if (c->cpu_shares != CGROUP_CPU_SHARES_INVALID)
461 return c->cpu_shares;
463 return CGROUP_CPU_SHARES_DEFAULT;
466 static void cgroup_apply_unified_cpu_config(Unit *u, uint64_t weight, uint64_t quota) {
467 char buf[MAX(DECIMAL_STR_MAX(uint64_t) + 1, (DECIMAL_STR_MAX(usec_t) + 1) * 2)];
470 xsprintf(buf, "%" PRIu64 "\n", weight);
471 r = cg_set_attribute("cpu", u->cgroup_path, "cpu.weight", buf);
473 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
474 "Failed to set cpu.weight: %m");
476 if (quota != USEC_INFINITY)
477 xsprintf(buf, USEC_FMT " " USEC_FMT "\n",
478 quota * CGROUP_CPU_QUOTA_PERIOD_USEC / USEC_PER_SEC, CGROUP_CPU_QUOTA_PERIOD_USEC);
480 xsprintf(buf, "max " USEC_FMT "\n", CGROUP_CPU_QUOTA_PERIOD_USEC);
482 r = cg_set_attribute("cpu", u->cgroup_path, "cpu.max", buf);
485 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
486 "Failed to set cpu.max: %m");
489 static void cgroup_apply_legacy_cpu_config(Unit *u, uint64_t shares, uint64_t quota) {
490 char buf[MAX(DECIMAL_STR_MAX(uint64_t), DECIMAL_STR_MAX(usec_t)) + 1];
493 xsprintf(buf, "%" PRIu64 "\n", shares);
494 r = cg_set_attribute("cpu", u->cgroup_path, "cpu.shares", buf);
496 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
497 "Failed to set cpu.shares: %m");
499 xsprintf(buf, USEC_FMT "\n", CGROUP_CPU_QUOTA_PERIOD_USEC);
500 r = cg_set_attribute("cpu", u->cgroup_path, "cpu.cfs_period_us", buf);
502 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
503 "Failed to set cpu.cfs_period_us: %m");
505 if (quota != USEC_INFINITY) {
506 xsprintf(buf, USEC_FMT "\n", quota * CGROUP_CPU_QUOTA_PERIOD_USEC / USEC_PER_SEC);
507 r = cg_set_attribute("cpu", u->cgroup_path, "cpu.cfs_quota_us", buf);
509 r = cg_set_attribute("cpu", u->cgroup_path, "cpu.cfs_quota_us", "-1");
511 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
512 "Failed to set cpu.cfs_quota_us: %m");
515 static uint64_t cgroup_cpu_shares_to_weight(uint64_t shares) {
516 return CLAMP(shares * CGROUP_WEIGHT_DEFAULT / CGROUP_CPU_SHARES_DEFAULT,
517 CGROUP_WEIGHT_MIN, CGROUP_WEIGHT_MAX);
520 static uint64_t cgroup_cpu_weight_to_shares(uint64_t weight) {
521 return CLAMP(weight * CGROUP_CPU_SHARES_DEFAULT / CGROUP_WEIGHT_DEFAULT,
522 CGROUP_CPU_SHARES_MIN, CGROUP_CPU_SHARES_MAX);
525 static bool cgroup_context_has_io_config(CGroupContext *c) {
526 return c->io_accounting ||
527 c->io_weight != CGROUP_WEIGHT_INVALID ||
528 c->startup_io_weight != CGROUP_WEIGHT_INVALID ||
529 c->io_device_weights ||
533 static bool cgroup_context_has_blockio_config(CGroupContext *c) {
534 return c->blockio_accounting ||
535 c->blockio_weight != CGROUP_BLKIO_WEIGHT_INVALID ||
536 c->startup_blockio_weight != CGROUP_BLKIO_WEIGHT_INVALID ||
537 c->blockio_device_weights ||
538 c->blockio_device_bandwidths;
541 static uint64_t cgroup_context_io_weight(CGroupContext *c, ManagerState state) {
542 if (IN_SET(state, MANAGER_STARTING, MANAGER_INITIALIZING) &&
543 c->startup_io_weight != CGROUP_WEIGHT_INVALID)
544 return c->startup_io_weight;
545 else if (c->io_weight != CGROUP_WEIGHT_INVALID)
548 return CGROUP_WEIGHT_DEFAULT;
551 static uint64_t cgroup_context_blkio_weight(CGroupContext *c, ManagerState state) {
552 if (IN_SET(state, MANAGER_STARTING, MANAGER_INITIALIZING) &&
553 c->startup_blockio_weight != CGROUP_BLKIO_WEIGHT_INVALID)
554 return c->startup_blockio_weight;
555 else if (c->blockio_weight != CGROUP_BLKIO_WEIGHT_INVALID)
556 return c->blockio_weight;
558 return CGROUP_BLKIO_WEIGHT_DEFAULT;
561 static uint64_t cgroup_weight_blkio_to_io(uint64_t blkio_weight) {
562 return CLAMP(blkio_weight * CGROUP_WEIGHT_DEFAULT / CGROUP_BLKIO_WEIGHT_DEFAULT,
563 CGROUP_WEIGHT_MIN, CGROUP_WEIGHT_MAX);
566 static uint64_t cgroup_weight_io_to_blkio(uint64_t io_weight) {
567 return CLAMP(io_weight * CGROUP_BLKIO_WEIGHT_DEFAULT / CGROUP_WEIGHT_DEFAULT,
568 CGROUP_BLKIO_WEIGHT_MIN, CGROUP_BLKIO_WEIGHT_MAX);
571 static void cgroup_apply_io_device_weight(Unit *u, const char *dev_path, uint64_t io_weight) {
572 char buf[DECIMAL_STR_MAX(dev_t)*2+2+DECIMAL_STR_MAX(uint64_t)+1];
576 r = lookup_block_device(dev_path, &dev);
580 xsprintf(buf, "%u:%u %" PRIu64 "\n", major(dev), minor(dev), io_weight);
581 r = cg_set_attribute("io", u->cgroup_path, "io.weight", buf);
583 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
584 "Failed to set io.weight: %m");
587 static void cgroup_apply_blkio_device_weight(Unit *u, const char *dev_path, uint64_t blkio_weight) {
588 char buf[DECIMAL_STR_MAX(dev_t)*2+2+DECIMAL_STR_MAX(uint64_t)+1];
592 r = lookup_block_device(dev_path, &dev);
596 xsprintf(buf, "%u:%u %" PRIu64 "\n", major(dev), minor(dev), blkio_weight);
597 r = cg_set_attribute("blkio", u->cgroup_path, "blkio.weight_device", buf);
599 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
600 "Failed to set blkio.weight_device: %m");
603 static unsigned cgroup_apply_io_device_limit(Unit *u, const char *dev_path, uint64_t *limits) {
604 char limit_bufs[_CGROUP_IO_LIMIT_TYPE_MAX][DECIMAL_STR_MAX(uint64_t)];
605 char buf[DECIMAL_STR_MAX(dev_t)*2+2+(6+DECIMAL_STR_MAX(uint64_t)+1)*4];
606 CGroupIOLimitType type;
611 r = lookup_block_device(dev_path, &dev);
615 for (type = 0; type < _CGROUP_IO_LIMIT_TYPE_MAX; type++) {
616 if (limits[type] != cgroup_io_limit_defaults[type]) {
617 xsprintf(limit_bufs[type], "%" PRIu64, limits[type]);
620 xsprintf(limit_bufs[type], "%s", limits[type] == CGROUP_LIMIT_MAX ? "max" : "0");
624 xsprintf(buf, "%u:%u rbps=%s wbps=%s riops=%s wiops=%s\n", major(dev), minor(dev),
625 limit_bufs[CGROUP_IO_RBPS_MAX], limit_bufs[CGROUP_IO_WBPS_MAX],
626 limit_bufs[CGROUP_IO_RIOPS_MAX], limit_bufs[CGROUP_IO_WIOPS_MAX]);
627 r = cg_set_attribute("io", u->cgroup_path, "io.max", buf);
629 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
630 "Failed to set io.max: %m");
634 static unsigned cgroup_apply_blkio_device_limit(Unit *u, const char *dev_path, uint64_t rbps, uint64_t wbps) {
635 char buf[DECIMAL_STR_MAX(dev_t)*2+2+DECIMAL_STR_MAX(uint64_t)+1];
640 r = lookup_block_device(dev_path, &dev);
644 if (rbps != CGROUP_LIMIT_MAX)
646 sprintf(buf, "%u:%u %" PRIu64 "\n", major(dev), minor(dev), rbps);
647 r = cg_set_attribute("blkio", u->cgroup_path, "blkio.throttle.read_bps_device", buf);
649 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
650 "Failed to set blkio.throttle.read_bps_device: %m");
652 if (wbps != CGROUP_LIMIT_MAX)
654 sprintf(buf, "%u:%u %" PRIu64 "\n", major(dev), minor(dev), wbps);
655 r = cg_set_attribute("blkio", u->cgroup_path, "blkio.throttle.write_bps_device", buf);
657 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
658 "Failed to set blkio.throttle.write_bps_device: %m");
663 static bool cgroup_context_has_unified_memory_config(CGroupContext *c) {
664 return c->memory_low > 0 || c->memory_high != CGROUP_LIMIT_MAX || c->memory_max != CGROUP_LIMIT_MAX || c->memory_swap_max != CGROUP_LIMIT_MAX;
667 static void cgroup_apply_unified_memory_limit(Unit *u, const char *file, uint64_t v) {
668 char buf[DECIMAL_STR_MAX(uint64_t) + 1] = "max";
671 if (v != CGROUP_LIMIT_MAX)
672 xsprintf(buf, "%" PRIu64 "\n", v);
674 r = cg_set_attribute("memory", u->cgroup_path, file, buf);
676 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
677 "Failed to set %s: %m", file);
680 static void cgroup_apply_firewall(Unit *u) {
685 if (u->type == UNIT_SLICE) /* Skip this for slice units, they are inner cgroup nodes, and since bpf/cgroup is
686 * not recursive we don't ever touch the bpf on them */
689 r = bpf_firewall_compile(u);
693 (void) bpf_firewall_install(u);
697 static void cgroup_context_apply(
699 CGroupMask apply_mask,
701 ManagerState state) {
710 c = unit_get_cgroup_context(u);
711 path = u->cgroup_path;
716 /* Nothing to do? Exit early! */
717 if (apply_mask == 0 && !apply_bpf)
720 /* Some cgroup attributes are not supported on the root cgroup,
721 * hence silently ignore */
722 is_root = isempty(path) || path_equal(path, "/");
724 /* Make sure we don't try to display messages with an empty path. */
727 /* We generally ignore errors caused by read-only mounted
728 * cgroup trees (assuming we are running in a container then),
729 * and missing cgroups, i.e. EROFS and ENOENT. */
731 if ((apply_mask & CGROUP_MASK_CPU) && !is_root) {
732 bool has_weight, has_shares;
734 has_weight = cgroup_context_has_cpu_weight(c);
735 has_shares = cgroup_context_has_cpu_shares(c);
737 if (cg_all_unified() > 0) {
741 weight = cgroup_context_cpu_weight(c, state);
742 else if (has_shares) {
743 uint64_t shares = cgroup_context_cpu_shares(c, state);
745 weight = cgroup_cpu_shares_to_weight(shares);
747 log_cgroup_compat(u, "Applying [Startup]CpuShares %" PRIu64 " as [Startup]CpuWeight %" PRIu64 " on %s",
748 shares, weight, path);
750 weight = CGROUP_WEIGHT_DEFAULT;
752 cgroup_apply_unified_cpu_config(u, weight, c->cpu_quota_per_sec_usec);
757 uint64_t weight = cgroup_context_cpu_weight(c, state);
759 shares = cgroup_cpu_weight_to_shares(weight);
761 log_cgroup_compat(u, "Applying [Startup]CpuWeight %" PRIu64 " as [Startup]CpuShares %" PRIu64 " on %s",
762 weight, shares, path);
763 } else if (has_shares)
764 shares = cgroup_context_cpu_shares(c, state);
766 shares = CGROUP_CPU_SHARES_DEFAULT;
768 cgroup_apply_legacy_cpu_config(u, shares, c->cpu_quota_per_sec_usec);
772 if (apply_mask & CGROUP_MASK_IO) {
773 bool has_io = cgroup_context_has_io_config(c);
774 bool has_blockio = cgroup_context_has_blockio_config(c);
777 char buf[8+DECIMAL_STR_MAX(uint64_t)+1];
781 weight = cgroup_context_io_weight(c, state);
782 else if (has_blockio) {
783 uint64_t blkio_weight = cgroup_context_blkio_weight(c, state);
785 weight = cgroup_weight_blkio_to_io(blkio_weight);
787 log_cgroup_compat(u, "Applying [Startup]BlockIOWeight %" PRIu64 " as [Startup]IOWeight %" PRIu64,
788 blkio_weight, weight);
790 weight = CGROUP_WEIGHT_DEFAULT;
792 xsprintf(buf, "default %" PRIu64 "\n", weight);
793 r = cg_set_attribute("io", path, "io.weight", buf);
795 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
796 "Failed to set io.weight: %m");
799 CGroupIODeviceWeight *w;
801 /* FIXME: no way to reset this list */
802 LIST_FOREACH(device_weights, w, c->io_device_weights)
803 cgroup_apply_io_device_weight(u, w->path, w->weight);
804 } else if (has_blockio) {
805 CGroupBlockIODeviceWeight *w;
807 /* FIXME: no way to reset this list */
808 LIST_FOREACH(device_weights, w, c->blockio_device_weights) {
809 weight = cgroup_weight_blkio_to_io(w->weight);
811 log_cgroup_compat(u, "Applying BlockIODeviceWeight %" PRIu64 " as IODeviceWeight %" PRIu64 " for %s",
812 w->weight, weight, w->path);
814 cgroup_apply_io_device_weight(u, w->path, weight);
819 /* Apply limits and free ones without config. */
821 CGroupIODeviceLimit *l, *next;
823 LIST_FOREACH_SAFE(device_limits, l, next, c->io_device_limits) {
824 if (!cgroup_apply_io_device_limit(u, l->path, l->limits))
825 cgroup_context_free_io_device_limit(c, l);
827 } else if (has_blockio) {
828 CGroupBlockIODeviceBandwidth *b, *next;
830 LIST_FOREACH_SAFE(device_bandwidths, b, next, c->blockio_device_bandwidths) {
831 uint64_t limits[_CGROUP_IO_LIMIT_TYPE_MAX];
832 CGroupIOLimitType type;
834 for (type = 0; type < _CGROUP_IO_LIMIT_TYPE_MAX; type++)
835 limits[type] = cgroup_io_limit_defaults[type];
837 limits[CGROUP_IO_RBPS_MAX] = b->rbps;
838 limits[CGROUP_IO_WBPS_MAX] = b->wbps;
840 log_cgroup_compat(u, "Applying BlockIO{Read|Write}Bandwidth %" PRIu64 " %" PRIu64 " as IO{Read|Write}BandwidthMax for %s",
841 b->rbps, b->wbps, b->path);
843 if (!cgroup_apply_io_device_limit(u, b->path, limits))
844 cgroup_context_free_blockio_device_bandwidth(c, b);
849 if (apply_mask & CGROUP_MASK_BLKIO) {
850 bool has_io = cgroup_context_has_io_config(c);
851 bool has_blockio = cgroup_context_has_blockio_config(c);
854 char buf[DECIMAL_STR_MAX(uint64_t)+1];
858 uint64_t io_weight = cgroup_context_io_weight(c, state);
860 weight = cgroup_weight_io_to_blkio(cgroup_context_io_weight(c, state));
862 log_cgroup_compat(u, "Applying [Startup]IOWeight %" PRIu64 " as [Startup]BlockIOWeight %" PRIu64,
864 } else if (has_blockio)
865 weight = cgroup_context_blkio_weight(c, state);
867 weight = CGROUP_BLKIO_WEIGHT_DEFAULT;
869 xsprintf(buf, "%" PRIu64 "\n", weight);
870 r = cg_set_attribute("blkio", path, "blkio.weight", buf);
872 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
873 "Failed to set blkio.weight: %m");
876 CGroupIODeviceWeight *w;
878 /* FIXME: no way to reset this list */
879 LIST_FOREACH(device_weights, w, c->io_device_weights) {
880 weight = cgroup_weight_io_to_blkio(w->weight);
882 log_cgroup_compat(u, "Applying IODeviceWeight %" PRIu64 " as BlockIODeviceWeight %" PRIu64 " for %s",
883 w->weight, weight, w->path);
885 cgroup_apply_blkio_device_weight(u, w->path, weight);
887 } else if (has_blockio) {
888 CGroupBlockIODeviceWeight *w;
890 /* FIXME: no way to reset this list */
891 LIST_FOREACH(device_weights, w, c->blockio_device_weights)
892 cgroup_apply_blkio_device_weight(u, w->path, w->weight);
896 /* Apply limits and free ones without config. */
898 CGroupIODeviceLimit *l, *next;
900 LIST_FOREACH_SAFE(device_limits, l, next, c->io_device_limits) {
901 log_cgroup_compat(u, "Applying IO{Read|Write}Bandwidth %" PRIu64 " %" PRIu64 " as BlockIO{Read|Write}BandwidthMax for %s",
902 l->limits[CGROUP_IO_RBPS_MAX], l->limits[CGROUP_IO_WBPS_MAX], l->path);
904 if (!cgroup_apply_blkio_device_limit(u, l->path, l->limits[CGROUP_IO_RBPS_MAX], l->limits[CGROUP_IO_WBPS_MAX]))
905 cgroup_context_free_io_device_limit(c, l);
907 } else if (has_blockio) {
908 CGroupBlockIODeviceBandwidth *b, *next;
910 LIST_FOREACH_SAFE(device_bandwidths, b, next, c->blockio_device_bandwidths)
911 if (!cgroup_apply_blkio_device_limit(u, b->path, b->rbps, b->wbps))
912 cgroup_context_free_blockio_device_bandwidth(c, b);
916 if ((apply_mask & CGROUP_MASK_MEMORY) && !is_root) {
917 if (cg_all_unified() > 0) {
918 uint64_t max, swap_max = CGROUP_LIMIT_MAX;
920 if (cgroup_context_has_unified_memory_config(c)) {
922 swap_max = c->memory_swap_max;
924 max = c->memory_limit;
926 if (max != CGROUP_LIMIT_MAX)
927 log_cgroup_compat(u, "Applying MemoryLimit %" PRIu64 " as MemoryMax", max);
930 cgroup_apply_unified_memory_limit(u, "memory.low", c->memory_low);
931 cgroup_apply_unified_memory_limit(u, "memory.high", c->memory_high);
932 cgroup_apply_unified_memory_limit(u, "memory.max", max);
933 cgroup_apply_unified_memory_limit(u, "memory.swap.max", swap_max);
935 char buf[DECIMAL_STR_MAX(uint64_t) + 1];
938 if (cgroup_context_has_unified_memory_config(c)) {
940 log_cgroup_compat(u, "Applying MemoryMax %" PRIi64 " as MemoryLimit", val);
942 val = c->memory_limit;
944 if (val == CGROUP_LIMIT_MAX)
945 strncpy(buf, "-1\n", sizeof(buf));
947 xsprintf(buf, "%" PRIu64 "\n", val);
949 r = cg_set_attribute("memory", path, "memory.limit_in_bytes", buf);
951 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
952 "Failed to set memory.limit_in_bytes: %m");
956 if ((apply_mask & CGROUP_MASK_DEVICES) && !is_root) {
957 CGroupDeviceAllow *a;
959 /* Changing the devices list of a populated cgroup
960 * might result in EINVAL, hence ignore EINVAL
963 if (c->device_allow || c->device_policy != CGROUP_AUTO)
964 r = cg_set_attribute("devices", path, "devices.deny", "a");
966 r = cg_set_attribute("devices", path, "devices.allow", "a");
968 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EINVAL, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
969 "Failed to reset devices.list: %m");
971 if (c->device_policy == CGROUP_CLOSED ||
972 (c->device_policy == CGROUP_AUTO && c->device_allow)) {
973 static const char auto_devices[] =
974 "/dev/null\0" "rwm\0"
975 "/dev/zero\0" "rwm\0"
976 "/dev/full\0" "rwm\0"
977 "/dev/random\0" "rwm\0"
978 "/dev/urandom\0" "rwm\0"
980 "/dev/pts/ptmx\0" "rw\0" /* /dev/pts/ptmx may not be duplicated, but accessed */
981 /* Allow /run/elogind/inaccessible/{chr,blk} devices for mapping InaccessiblePaths */
982 /* Allow /run/systemd/inaccessible/{chr,blk} devices for mapping InaccessiblePaths */
983 "-/run/systemd/inaccessible/chr\0" "rwm\0"
984 "-/run/systemd/inaccessible/blk\0" "rwm\0";
988 NULSTR_FOREACH_PAIR(x, y, auto_devices)
989 whitelist_device(path, x, y);
991 whitelist_major(path, "pts", 'c', "rw");
994 LIST_FOREACH(device_allow, a, c->device_allow) {
1010 if (path_startswith(a->path, "/dev/"))
1011 whitelist_device(path, a->path, acc);
1012 else if ((val = startswith(a->path, "block-")))
1013 whitelist_major(path, val, 'b', acc);
1014 else if ((val = startswith(a->path, "char-")))
1015 whitelist_major(path, val, 'c', acc);
1017 log_unit_debug(u, "Ignoring device %s while writing cgroup attribute.", a->path);
1021 if ((apply_mask & CGROUP_MASK_PIDS) && !is_root) {
1023 if (c->tasks_max != CGROUP_LIMIT_MAX) {
1024 char buf[DECIMAL_STR_MAX(uint64_t) + 2];
1026 sprintf(buf, "%" PRIu64 "\n", c->tasks_max);
1027 r = cg_set_attribute("pids", path, "pids.max", buf);
1029 r = cg_set_attribute("pids", path, "pids.max", "max");
1032 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
1033 "Failed to set pids.max: %m");
1037 cgroup_apply_firewall(u);
1040 CGroupMask cgroup_context_get_mask(CGroupContext *c) {
1041 CGroupMask mask = 0;
1043 /* Figure out which controllers we need */
1045 if (c->cpu_accounting ||
1046 cgroup_context_has_cpu_weight(c) ||
1047 cgroup_context_has_cpu_shares(c) ||
1048 c->cpu_quota_per_sec_usec != USEC_INFINITY)
1049 mask |= CGROUP_MASK_CPUACCT | CGROUP_MASK_CPU;
1051 if (cgroup_context_has_io_config(c) || cgroup_context_has_blockio_config(c))
1052 mask |= CGROUP_MASK_IO | CGROUP_MASK_BLKIO;
1054 if (c->memory_accounting ||
1055 c->memory_limit != CGROUP_LIMIT_MAX ||
1056 cgroup_context_has_unified_memory_config(c))
1057 mask |= CGROUP_MASK_MEMORY;
1059 if (c->device_allow ||
1060 c->device_policy != CGROUP_AUTO)
1061 mask |= CGROUP_MASK_DEVICES;
1063 if (c->tasks_accounting ||
1064 c->tasks_max != (uint64_t) -1)
1065 mask |= CGROUP_MASK_PIDS;
1070 CGroupMask unit_get_own_mask(Unit *u) {
1073 /* Returns the mask of controllers the unit needs for itself */
1075 c = unit_get_cgroup_context(u);
1079 return cgroup_context_get_mask(c) | unit_get_delegate_mask(u);
1082 CGroupMask unit_get_delegate_mask(Unit *u) {
1085 /* If delegation is turned on, then turn on selected controllers, unless we are on the legacy hierarchy and the
1086 * process we fork into is known to drop privileges, and hence shouldn't get access to the controllers.
1088 * Note that on the unified hierarchy it is safe to delegate controllers to unprivileged services. */
1090 if (u->type == UNIT_SLICE)
1093 c = unit_get_cgroup_context(u);
1100 if (cg_all_unified() <= 0) {
1103 e = unit_get_exec_context(u);
1104 if (e && !exec_context_maintains_privileges(e))
1108 return c->delegate_controllers;
1111 CGroupMask unit_get_members_mask(Unit *u) {
1114 /* Returns the mask of controllers all of the unit's children require, merged */
1116 if (u->cgroup_members_mask_valid)
1117 return u->cgroup_members_mask;
1119 u->cgroup_members_mask = 0;
1121 if (u->type == UNIT_SLICE) {
1126 HASHMAP_FOREACH_KEY(v, member, u->dependencies[UNIT_BEFORE], i) {
1131 if (UNIT_DEREF(member->slice) != u)
1134 u->cgroup_members_mask |= unit_get_subtree_mask(member); /* note that this calls ourselves again, for the children */
1138 u->cgroup_members_mask_valid = true;
1139 return u->cgroup_members_mask;
1142 CGroupMask unit_get_siblings_mask(Unit *u) {
1145 /* Returns the mask of controllers all of the unit's siblings
1146 * require, i.e. the members mask of the unit's parent slice
1147 * if there is one. */
1149 if (UNIT_ISSET(u->slice))
1150 return unit_get_members_mask(UNIT_DEREF(u->slice));
1152 return unit_get_subtree_mask(u); /* we are the top-level slice */
1155 CGroupMask unit_get_subtree_mask(Unit *u) {
1157 /* Returns the mask of this subtree, meaning of the group
1158 * itself and its children. */
1160 return unit_get_own_mask(u) | unit_get_members_mask(u);
1163 CGroupMask unit_get_target_mask(Unit *u) {
1166 /* This returns the cgroup mask of all controllers to enable
1167 * for a specific cgroup, i.e. everything it needs itself,
1168 * plus all that its children need, plus all that its siblings
1169 * need. This is primarily useful on the legacy cgroup
1170 * hierarchy, where we need to duplicate each cgroup in each
1171 * hierarchy that shall be enabled for it. */
1173 mask = unit_get_own_mask(u) | unit_get_members_mask(u) | unit_get_siblings_mask(u);
1174 mask &= u->manager->cgroup_supported;
1179 CGroupMask unit_get_enable_mask(Unit *u) {
1182 /* This returns the cgroup mask of all controllers to enable
1183 * for the children of a specific cgroup. This is primarily
1184 * useful for the unified cgroup hierarchy, where each cgroup
1185 * controls which controllers are enabled for its children. */
1187 mask = unit_get_members_mask(u);
1188 mask &= u->manager->cgroup_supported;
1193 bool unit_get_needs_bpf(Unit *u) {
1198 /* We never attach BPF to slice units, as they are inner cgroup nodes and cgroup/BPF is not recursive at the
1200 if (u->type == UNIT_SLICE)
1203 c = unit_get_cgroup_context(u);
1207 if (c->ip_accounting ||
1208 c->ip_address_allow ||
1212 /* If any parent slice has an IP access list defined, it applies too */
1213 for (p = UNIT_DEREF(u->slice); p; p = UNIT_DEREF(p->slice)) {
1214 c = unit_get_cgroup_context(p);
1218 if (c->ip_address_allow ||
1226 /* Recurse from a unit up through its containing slices, propagating
1227 * mask bits upward. A unit is also member of itself. */
1228 void unit_update_cgroup_members_masks(Unit *u) {
1234 /* Calculate subtree mask */
1235 m = unit_get_subtree_mask(u);
1237 /* See if anything changed from the previous invocation. If
1238 * not, we're done. */
1239 if (u->cgroup_subtree_mask_valid && m == u->cgroup_subtree_mask)
1243 u->cgroup_subtree_mask_valid &&
1244 ((m & ~u->cgroup_subtree_mask) != 0) &&
1245 ((~m & u->cgroup_subtree_mask) == 0);
1247 u->cgroup_subtree_mask = m;
1248 u->cgroup_subtree_mask_valid = true;
1250 if (UNIT_ISSET(u->slice)) {
1251 Unit *s = UNIT_DEREF(u->slice);
1254 /* There's more set now than before. We
1255 * propagate the new mask to the parent's mask
1256 * (not caring if it actually was valid or
1259 s->cgroup_members_mask |= m;
1262 /* There's less set now than before (or we
1263 * don't know), we need to recalculate
1264 * everything, so let's invalidate the
1265 * parent's members mask */
1267 s->cgroup_members_mask_valid = false;
1269 /* And now make sure that this change also hits our
1271 unit_update_cgroup_members_masks(s);
1275 static const char *migrate_callback(CGroupMask mask, void *userdata) {
1282 if (u->cgroup_path &&
1283 u->cgroup_realized &&
1284 (u->cgroup_realized_mask & mask) == mask)
1285 return u->cgroup_path;
1287 u = UNIT_DEREF(u->slice);
1293 char *unit_default_cgroup_path(Unit *u) {
1294 _cleanup_free_ char *escaped = NULL, *slice = NULL;
1299 if (unit_has_name(u, SPECIAL_ROOT_SLICE))
1300 return strdup(u->manager->cgroup_root);
1302 if (UNIT_ISSET(u->slice) && !unit_has_name(UNIT_DEREF(u->slice), SPECIAL_ROOT_SLICE)) {
1303 r = cg_slice_to_path(UNIT_DEREF(u->slice)->id, &slice);
1308 escaped = cg_escape(u->id);
1313 return strjoin(u->manager->cgroup_root, "/", slice, "/",
1316 return strjoin(u->manager->cgroup_root, "/", escaped);
1319 int unit_set_cgroup_path(Unit *u, const char *path) {
1320 _cleanup_free_ char *p = NULL;
1332 if (streq_ptr(u->cgroup_path, p))
1336 r = hashmap_put(u->manager->cgroup_unit, p, u);
1341 unit_release_cgroup(u);
1349 int unit_watch_cgroup(Unit *u) {
1350 _cleanup_free_ char *events = NULL;
1355 if (!u->cgroup_path)
1358 if (u->cgroup_inotify_wd >= 0)
1361 /* Only applies to the unified hierarchy */
1362 r = cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER);
1364 return log_error_errno(r, "Failed to determine whether the name=systemd hierarchy is unified: %m");
1368 /* Don't watch the root slice, it's pointless. */
1369 if (unit_has_name(u, SPECIAL_ROOT_SLICE))
1372 r = hashmap_ensure_allocated(&u->manager->cgroup_inotify_wd_unit, &trivial_hash_ops);
1376 r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, "cgroup.events", &events);
1380 u->cgroup_inotify_wd = inotify_add_watch(u->manager->cgroup_inotify_fd, events, IN_MODIFY);
1381 if (u->cgroup_inotify_wd < 0) {
1383 if (errno == ENOENT) /* If the directory is already
1384 * gone we don't need to track
1385 * it, so this is not an error */
1388 return log_unit_error_errno(u, errno, "Failed to add inotify watch descriptor for control group %s: %m", u->cgroup_path);
1391 r = hashmap_put(u->manager->cgroup_inotify_wd_unit, INT_TO_PTR(u->cgroup_inotify_wd), u);
1393 return log_unit_error_errno(u, r, "Failed to add inotify watch descriptor to hash map: %m");
1398 static int unit_create_cgroup(
1400 CGroupMask target_mask,
1401 CGroupMask enable_mask,
1409 c = unit_get_cgroup_context(u);
1413 if (!u->cgroup_path) {
1414 _cleanup_free_ char *path = NULL;
1416 path = unit_default_cgroup_path(u);
1420 r = unit_set_cgroup_path(u, path);
1422 return log_unit_error_errno(u, r, "Control group %s exists already.", path);
1424 return log_unit_error_errno(u, r, "Failed to set unit's control group path to %s: %m", path);
1427 /* First, create our own group */
1428 r = cg_create_everywhere(u->manager->cgroup_supported, target_mask, u->cgroup_path);
1430 return log_unit_error_errno(u, r, "Failed to create cgroup %s: %m", u->cgroup_path);
1432 /* Start watching it */
1433 (void) unit_watch_cgroup(u);
1435 /* Enable all controllers we need */
1436 r = cg_enable_everywhere(u->manager->cgroup_supported, enable_mask, u->cgroup_path);
1438 log_unit_warning_errno(u, r, "Failed to enable controllers on cgroup %s, ignoring: %m", u->cgroup_path);
1440 /* Keep track that this is now realized */
1441 u->cgroup_realized = true;
1442 u->cgroup_realized_mask = target_mask;
1443 u->cgroup_enabled_mask = enable_mask;
1444 u->cgroup_bpf_state = needs_bpf ? UNIT_CGROUP_BPF_ON : UNIT_CGROUP_BPF_OFF;
1446 if (u->type != UNIT_SLICE && !c->delegate) {
1448 /* Then, possibly move things over, but not if
1449 * subgroups may contain processes, which is the case
1450 * for slice and delegation units. */
1451 r = cg_migrate_everywhere(u->manager->cgroup_supported, u->cgroup_path, u->cgroup_path, migrate_callback, u);
1453 log_unit_warning_errno(u, r, "Failed to migrate cgroup from to %s, ignoring: %m", u->cgroup_path);
1459 int unit_attach_pids_to_cgroup(Unit *u) {
1463 r = unit_realize_cgroup(u);
1467 r = cg_attach_many_everywhere(u->manager->cgroup_supported, u->cgroup_path, u->pids, migrate_callback, u);
1474 static void cgroup_xattr_apply(Unit *u) {
1475 char ids[SD_ID128_STRING_MAX];
1480 if (!MANAGER_IS_SYSTEM(u->manager))
1483 if (sd_id128_is_null(u->invocation_id))
1486 r = cg_set_xattr(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path,
1487 "trusted.invocation_id",
1488 sd_id128_to_string(u->invocation_id, ids), 32,
1491 log_unit_debug_errno(u, r, "Failed to set invocation ID on control group %s, ignoring: %m", u->cgroup_path);
1494 static bool unit_has_mask_realized(
1496 CGroupMask target_mask,
1497 CGroupMask enable_mask,
1502 return u->cgroup_realized &&
1503 u->cgroup_realized_mask == target_mask &&
1504 u->cgroup_enabled_mask == enable_mask &&
1505 ((needs_bpf && u->cgroup_bpf_state == UNIT_CGROUP_BPF_ON) ||
1506 (!needs_bpf && u->cgroup_bpf_state == UNIT_CGROUP_BPF_OFF));
1509 /* Check if necessary controllers and attributes for a unit are in place.
1511 * If so, do nothing.
1512 * If not, create paths, move processes over, and set attributes.
1514 * Returns 0 on success and < 0 on failure. */
1515 static int unit_realize_cgroup_now(Unit *u, ManagerState state) {
1516 CGroupMask target_mask, enable_mask;
1517 bool needs_bpf, apply_bpf;
1522 if (u->in_cgroup_realize_queue) {
1523 LIST_REMOVE(cgroup_realize_queue, u->manager->cgroup_realize_queue, u);
1524 u->in_cgroup_realize_queue = false;
1527 target_mask = unit_get_target_mask(u);
1528 enable_mask = unit_get_enable_mask(u);
1529 needs_bpf = unit_get_needs_bpf(u);
1531 if (unit_has_mask_realized(u, target_mask, enable_mask, needs_bpf))
1534 /* Make sure we apply the BPF filters either when one is configured, or if none is configured but previously
1535 * the state was anything but off. This way, if a unit with a BPF filter applied is reconfigured to lose it
1536 * this will trickle down properly to cgroupfs. */
1537 apply_bpf = needs_bpf || u->cgroup_bpf_state != UNIT_CGROUP_BPF_OFF;
1539 /* First, realize parents */
1540 if (UNIT_ISSET(u->slice)) {
1541 r = unit_realize_cgroup_now(UNIT_DEREF(u->slice), state);
1546 /* And then do the real work */
1547 r = unit_create_cgroup(u, target_mask, enable_mask, needs_bpf);
1551 /* Finally, apply the necessary attributes. */
1552 cgroup_context_apply(u, target_mask, apply_bpf, state);
1553 cgroup_xattr_apply(u);
1558 static void unit_add_to_cgroup_realize_queue(Unit *u) {
1561 if (u->in_cgroup_realize_queue)
1564 LIST_PREPEND(cgroup_realize_queue, u->manager->cgroup_realize_queue, u);
1565 u->in_cgroup_realize_queue = true;
1568 unsigned manager_dispatch_cgroup_realize_queue(Manager *m) {
1576 state = manager_state(m);
1578 while ((i = m->cgroup_realize_queue)) {
1579 assert(i->in_cgroup_realize_queue);
1581 r = unit_realize_cgroup_now(i, state);
1583 log_warning_errno(r, "Failed to realize cgroups for queued unit %s, ignoring: %m", i->id);
1591 static void unit_add_siblings_to_cgroup_realize_queue(Unit *u) {
1594 /* This adds the siblings of the specified unit and the
1595 * siblings of all parent units to the cgroup queue. (But
1596 * neither the specified unit itself nor the parents.) */
1598 while ((slice = UNIT_DEREF(u->slice))) {
1603 HASHMAP_FOREACH_KEY(v, m, u->dependencies[UNIT_BEFORE], i) {
1607 /* Skip units that have a dependency on the slice
1608 * but aren't actually in it. */
1609 if (UNIT_DEREF(m->slice) != slice)
1612 /* No point in doing cgroup application for units
1613 * without active processes. */
1614 if (UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(m)))
1617 /* If the unit doesn't need any new controllers
1618 * and has current ones realized, it doesn't need
1620 if (unit_has_mask_realized(m,
1621 unit_get_target_mask(m),
1622 unit_get_enable_mask(m),
1623 unit_get_needs_bpf(m)))
1626 unit_add_to_cgroup_realize_queue(m);
1633 int unit_realize_cgroup(Unit *u) {
1636 if (!UNIT_HAS_CGROUP_CONTEXT(u))
1639 /* So, here's the deal: when realizing the cgroups for this
1640 * unit, we need to first create all parents, but there's more
1641 * actually: for the weight-based controllers we also need to
1642 * make sure that all our siblings (i.e. units that are in the
1643 * same slice as we are) have cgroups, too. Otherwise, things
1644 * would become very uneven as each of their processes would
1645 * get as much resources as all our group together. This call
1646 * will synchronously create the parent cgroups, but will
1647 * defer work on the siblings to the next event loop
1650 /* Add all sibling slices to the cgroup queue. */
1651 unit_add_siblings_to_cgroup_realize_queue(u);
1653 /* And realize this one now (and apply the values) */
1654 return unit_realize_cgroup_now(u, manager_state(u->manager));
1657 void unit_release_cgroup(Unit *u) {
1660 /* Forgets all cgroup details for this cgroup */
1662 if (u->cgroup_path) {
1663 (void) hashmap_remove(u->manager->cgroup_unit, u->cgroup_path);
1664 u->cgroup_path = mfree(u->cgroup_path);
1667 if (u->cgroup_inotify_wd >= 0) {
1668 if (inotify_rm_watch(u->manager->cgroup_inotify_fd, u->cgroup_inotify_wd) < 0)
1669 log_unit_debug_errno(u, errno, "Failed to remove cgroup inotify watch %i for %s, ignoring", u->cgroup_inotify_wd, u->id);
1671 (void) hashmap_remove(u->manager->cgroup_inotify_wd_unit, INT_TO_PTR(u->cgroup_inotify_wd));
1672 u->cgroup_inotify_wd = -1;
1676 void unit_prune_cgroup(Unit *u) {
1682 /* Removes the cgroup, if empty and possible, and stops watching it. */
1684 if (!u->cgroup_path)
1687 (void) unit_get_cpu_usage(u, NULL); /* Cache the last CPU usage value before we destroy the cgroup */
1689 is_root_slice = unit_has_name(u, SPECIAL_ROOT_SLICE);
1691 r = cg_trim_everywhere(u->manager->cgroup_supported, u->cgroup_path, !is_root_slice);
1693 log_unit_debug_errno(u, r, "Failed to destroy cgroup %s, ignoring: %m", u->cgroup_path);
1700 unit_release_cgroup(u);
1702 u->cgroup_realized = false;
1703 u->cgroup_realized_mask = 0;
1704 u->cgroup_enabled_mask = 0;
1707 int unit_search_main_pid(Unit *u, pid_t *ret) {
1708 _cleanup_fclose_ FILE *f = NULL;
1709 pid_t pid = 0, npid, mypid;
1715 if (!u->cgroup_path)
1718 r = cg_enumerate_processes(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, &f);
1722 mypid = getpid_cached();
1723 while (cg_read_pid(f, &npid) > 0) {
1729 /* Ignore processes that aren't our kids */
1730 if (get_process_ppid(npid, &ppid) >= 0 && ppid != mypid)
1734 /* Dang, there's more than one daemonized PID
1735 in this group, so we don't know what process
1736 is the main process. */
1747 static int unit_watch_pids_in_path(Unit *u, const char *path) {
1748 _cleanup_closedir_ DIR *d = NULL;
1749 _cleanup_fclose_ FILE *f = NULL;
1755 r = cg_enumerate_processes(SYSTEMD_CGROUP_CONTROLLER, path, &f);
1761 while ((r = cg_read_pid(f, &pid)) > 0) {
1762 r = unit_watch_pid(u, pid);
1763 if (r < 0 && ret >= 0)
1767 if (r < 0 && ret >= 0)
1771 r = cg_enumerate_subgroups(SYSTEMD_CGROUP_CONTROLLER, path, &d);
1778 while ((r = cg_read_subgroup(d, &fn)) > 0) {
1779 _cleanup_free_ char *p = NULL;
1781 p = strjoin(path, "/", fn);
1787 r = unit_watch_pids_in_path(u, p);
1788 if (r < 0 && ret >= 0)
1792 if (r < 0 && ret >= 0)
1799 int unit_watch_all_pids(Unit *u) {
1804 /* Adds all PIDs from our cgroup to the set of PIDs we
1805 * watch. This is a fallback logic for cases where we do not
1806 * get reliable cgroup empty notifications: we try to use
1807 * SIGCHLD as replacement. */
1809 if (!u->cgroup_path)
1812 r = cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER);
1815 if (r > 0) /* On unified we can use proper notifications */
1818 return unit_watch_pids_in_path(u, u->cgroup_path);
1821 static int on_cgroup_empty_event(sd_event_source *s, void *userdata) {
1822 Manager *m = userdata;
1829 u = m->cgroup_empty_queue;
1833 assert(u->in_cgroup_empty_queue);
1834 u->in_cgroup_empty_queue = false;
1835 LIST_REMOVE(cgroup_empty_queue, m->cgroup_empty_queue, u);
1837 if (m->cgroup_empty_queue) {
1838 /* More stuff queued, let's make sure we remain enabled */
1839 r = sd_event_source_set_enabled(s, SD_EVENT_ONESHOT);
1841 log_debug_errno(r, "Failed to reenable cgroup empty event source: %m");
1844 unit_add_to_gc_queue(u);
1846 if (UNIT_VTABLE(u)->notify_cgroup_empty)
1847 UNIT_VTABLE(u)->notify_cgroup_empty(u);
1852 void unit_add_to_cgroup_empty_queue(Unit *u) {
1857 /* Note that there are four different ways how cgroup empty events reach us:
1859 * 1. On the unified hierarchy we get an inotify event on the cgroup
1861 * 2. On the legacy hierarchy, when running in system mode, we get a datagram on the cgroup agent socket
1863 * 3. On the legacy hierarchy, when running in user mode, we get a D-Bus signal on the system bus
1865 * 4. On the legacy hierarchy, in service units we start watching all processes of the cgroup for SIGCHLD as
1866 * soon as we get one SIGCHLD, to deal with unreliable cgroup notifications.
1868 * Regardless which way we got the notification, we'll verify it here, and then add it to a separate
1869 * queue. This queue will be dispatched at a lower priority than the SIGCHLD handler, so that we always use
1870 * SIGCHLD if we can get it first, and only use the cgroup empty notifications if there's no SIGCHLD pending
1871 * (which might happen if the cgroup doesn't contain processes that are our own child, which is typically the
1872 * case for scope units). */
1874 if (u->in_cgroup_empty_queue)
1877 /* Let's verify that the cgroup is really empty */
1878 if (!u->cgroup_path)
1880 r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path);
1882 log_unit_debug_errno(u, r, "Failed to determine whether cgroup %s is empty: %m", u->cgroup_path);
1888 LIST_PREPEND(cgroup_empty_queue, u->manager->cgroup_empty_queue, u);
1889 u->in_cgroup_empty_queue = true;
1891 /* Trigger the defer event */
1892 r = sd_event_source_set_enabled(u->manager->cgroup_empty_event_source, SD_EVENT_ONESHOT);
1894 log_debug_errno(r, "Failed to enable cgroup empty event source: %m");
1897 static int on_cgroup_inotify_event(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
1898 Manager *m = userdata;
1905 union inotify_event_buffer buffer;
1906 struct inotify_event *e;
1909 l = read(fd, &buffer, sizeof(buffer));
1911 if (IN_SET(errno, EINTR, EAGAIN))
1914 return log_error_errno(errno, "Failed to read control group inotify events: %m");
1917 FOREACH_INOTIFY_EVENT(e, buffer, l) {
1921 /* Queue overflow has no watch descriptor */
1924 if (e->mask & IN_IGNORED)
1925 /* The watch was just removed */
1928 u = hashmap_get(m->cgroup_inotify_wd_unit, INT_TO_PTR(e->wd));
1929 if (!u) /* Not that inotify might deliver
1930 * events for a watch even after it
1931 * was removed, because it was queued
1932 * before the removal. Let's ignore
1933 * this here safely. */
1936 unit_add_to_cgroup_empty_queue(u);
1942 int manager_setup_cgroup(Manager *m) {
1943 _cleanup_free_ char *path = NULL;
1944 const char *scope_path;
1951 /* 1. Determine hierarchy */
1952 m->cgroup_root = mfree(m->cgroup_root);
1953 #if 0 /// elogind is not init and must therefore search for PID 1 instead of self.
1954 r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 0, &m->cgroup_root);
1956 r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 1, &m->cgroup_root);
1959 return log_error_errno(r, "Cannot determine cgroup we are running in: %m");
1961 #if 0 /// elogind does not support systemd scopes and slices
1962 /* Chop off the init scope, if we are already located in it */
1963 e = endswith(m->cgroup_root, "/" SPECIAL_INIT_SCOPE);
1965 /* LEGACY: Also chop off the system slice if we are in
1966 * it. This is to support live upgrades from older systemd
1967 * versions where PID 1 was moved there. Also see
1968 * cg_get_root_path(). */
1969 if (!e && MANAGER_IS_SYSTEM(m)) {
1970 e = endswith(m->cgroup_root, "/" SPECIAL_SYSTEM_SLICE);
1972 e = endswith(m->cgroup_root, "/system"); /* even more legacy */
1978 /* And make sure to store away the root value without trailing
1979 * slash, even for the root dir, so that we can easily prepend
1981 while ((e = endswith(m->cgroup_root, "/")))
1983 log_debug_elogind("Cgroup Controller \"%s\" -> root \"%s\"",
1984 SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root);
1987 r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, NULL, &path);
1989 return log_error_errno(r, "Cannot find cgroup mount point: %m");
1991 r = cg_unified_flush();
1993 return log_error_errno(r, "Couldn't determine if we are running in the unified hierarchy: %m");
1995 all_unified = cg_all_unified();
1996 if (all_unified < 0)
1997 return log_error_errno(all_unified, "Couldn't determine whether we are in all unified mode: %m");
1998 if (all_unified > 0)
1999 log_debug("Unified cgroup hierarchy is located at %s.", path);
2001 r = cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER);
2003 return log_error_errno(r, "Failed to determine whether systemd's own controller is in unified mode: %m");
2005 log_debug("Unified cgroup hierarchy is located at %s. Controllers are on legacy hierarchies.", path);
2007 log_debug("Using cgroup controller " SYSTEMD_CGROUP_CONTROLLER_LEGACY ". File system hierarchy is at %s.", path);
2010 #if 0 /// elogind is not init, and does not install the agent here.
2011 /* 3. Allocate cgroup empty defer event source */
2012 m->cgroup_empty_event_source = sd_event_source_unref(m->cgroup_empty_event_source);
2013 r = sd_event_add_defer(m->event, &m->cgroup_empty_event_source, on_cgroup_empty_event, m);
2015 return log_error_errno(r, "Failed to create cgroup empty event source: %m");
2017 r = sd_event_source_set_priority(m->cgroup_empty_event_source, SD_EVENT_PRIORITY_NORMAL-5);
2019 return log_error_errno(r, "Failed to set priority of cgroup empty event source: %m");
2021 r = sd_event_source_set_enabled(m->cgroup_empty_event_source, SD_EVENT_OFF);
2023 return log_error_errno(r, "Failed to disable cgroup empty event source: %m");
2025 (void) sd_event_source_set_description(m->cgroup_empty_event_source, "cgroup-empty");
2027 /* 4. Install notifier inotify object, or agent */
2028 if (cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER) > 0) {
2030 /* In the unified hierarchy we can get cgroup empty notifications via inotify. */
2032 m->cgroup_inotify_event_source = sd_event_source_unref(m->cgroup_inotify_event_source);
2033 safe_close(m->cgroup_inotify_fd);
2035 m->cgroup_inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC);
2036 if (m->cgroup_inotify_fd < 0)
2037 return log_error_errno(errno, "Failed to create control group inotify object: %m");
2039 r = sd_event_add_io(m->event, &m->cgroup_inotify_event_source, m->cgroup_inotify_fd, EPOLLIN, on_cgroup_inotify_event, m);
2041 return log_error_errno(r, "Failed to watch control group inotify object: %m");
2043 /* Process cgroup empty notifications early, but after service notifications and SIGCHLD. Also
2044 * see handling of cgroup agent notifications, for the classic cgroup hierarchy support. */
2045 r = sd_event_source_set_priority(m->cgroup_inotify_event_source, SD_EVENT_PRIORITY_NORMAL-4);
2047 return log_error_errno(r, "Failed to set priority of inotify event source: %m");
2049 (void) sd_event_source_set_description(m->cgroup_inotify_event_source, "cgroup-inotify");
2051 } else if (MANAGER_IS_SYSTEM(m) && m->test_run_flags == 0) {
2053 /* On the legacy hierarchy we only get notifications via cgroup agents. (Which isn't really reliable,
2054 * since it does not generate events when control groups with children run empty. */
2056 r = cg_install_release_agent(SYSTEMD_CGROUP_CONTROLLER, SYSTEMD_CGROUP_AGENT_PATH);
2058 log_warning_errno(r, "Failed to install release agent, ignoring: %m");
2060 log_debug("Installed release agent.");
2062 log_debug("Release agent already installed.");
2065 /* 5. Make sure we are in the special "init.scope" unit in the root slice. */
2066 scope_path = strjoina(m->cgroup_root, "/" SPECIAL_INIT_SCOPE);
2067 r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, scope_path, 0);
2070 * This method is in core, and normally called by systemd
2071 * being init. As elogind is never init, we can not install
2072 * our agent here. We do so when mounting our cgroup file
2073 * system, so only if elogind is its own tiny controller.
2074 * Further, elogind is not meant to run in systemd init scope. */
2075 if (MANAGER_IS_SYSTEM(m))
2076 // we are our own cgroup controller
2077 scope_path = strjoina("");
2078 else if (streq(m->cgroup_root, "/elogind"))
2079 // root already is our cgroup
2080 scope_path = strjoina(m->cgroup_root);
2082 // we have to create our own group
2083 scope_path = strjoina(m->cgroup_root, "/elogind");
2084 r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, scope_path, 0);
2087 return log_error_errno(r, "Failed to create %s control group: %m", scope_path);
2088 log_debug_elogind("Created control group \"%s\"", scope_path);
2090 #if 0 /// elogind is not a "sub-controller" like systemd, so migration is not needed.
2091 /* Also, move all other userspace processes remaining in the root cgroup into that scope. */
2092 r = cg_migrate(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, SYSTEMD_CGROUP_CONTROLLER, scope_path, 0);
2094 log_warning_errno(r, "Couldn't move remaining userspace processes, ignoring: %m");
2097 /* 6. And pin it, so that it cannot be unmounted */
2098 safe_close(m->pin_cgroupfs_fd);
2099 m->pin_cgroupfs_fd = open(path, O_RDONLY|O_CLOEXEC|O_DIRECTORY|O_NOCTTY|O_NONBLOCK);
2100 if (m->pin_cgroupfs_fd < 0)
2101 return log_error_errno(errno, "Failed to open pin file: %m");
2103 /* 7. Always enable hierarchical support if it exists... */
2104 if (!all_unified && m->test_run_flags == 0)
2105 (void) cg_set_attribute("memory", "/", "memory.use_hierarchy", "1");
2107 /* 8. Figure out which controllers are supported, and log about it */
2108 r = cg_mask_supported(&m->cgroup_supported);
2110 return log_error_errno(r, "Failed to determine supported controllers: %m");
2111 for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++)
2112 log_debug("Controller '%s' supported: %s", cgroup_controller_to_string(c), yes_no(m->cgroup_supported & CGROUP_CONTROLLER_TO_MASK(c)));
2117 void manager_shutdown_cgroup(Manager *m, bool delete) {
2120 /* We can't really delete the group, since we are in it. But
2122 if (delete && m->cgroup_root)
2123 (void) cg_trim(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, false);
2125 #if 0 /// elogind is not init
2126 m->cgroup_empty_event_source = sd_event_source_unref(m->cgroup_empty_event_source);
2128 m->cgroup_inotify_wd_unit = hashmap_free(m->cgroup_inotify_wd_unit);
2130 m->cgroup_inotify_event_source = sd_event_source_unref(m->cgroup_inotify_event_source);
2131 m->cgroup_inotify_fd = safe_close(m->cgroup_inotify_fd);
2134 m->pin_cgroupfs_fd = safe_close(m->pin_cgroupfs_fd);
2136 m->cgroup_root = mfree(m->cgroup_root);
2139 #if 0 /// UNNEEDED by elogind
2140 Unit* manager_get_unit_by_cgroup(Manager *m, const char *cgroup) {
2147 u = hashmap_get(m->cgroup_unit, cgroup);
2151 p = strdupa(cgroup);
2155 e = strrchr(p, '/');
2157 return hashmap_get(m->cgroup_unit, SPECIAL_ROOT_SLICE);
2161 u = hashmap_get(m->cgroup_unit, p);
2167 Unit *manager_get_unit_by_pid_cgroup(Manager *m, pid_t pid) {
2168 _cleanup_free_ char *cgroup = NULL;
2176 r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, pid, &cgroup);
2180 return manager_get_unit_by_cgroup(m, cgroup);
2183 Unit *manager_get_unit_by_pid(Manager *m, pid_t pid) {
2192 return hashmap_get(m->units, SPECIAL_INIT_SCOPE);
2194 u = hashmap_get(m->watch_pids1, PID_TO_PTR(pid));
2198 u = hashmap_get(m->watch_pids2, PID_TO_PTR(pid));
2202 return manager_get_unit_by_pid_cgroup(m, pid);
2206 #if 0 /// elogind must substitute this with its own variant
2207 int manager_notify_cgroup_empty(Manager *m, const char *cgroup) {
2213 /* Called on the legacy hierarchy whenever we get an explicit cgroup notification from the cgroup agent process
2214 * or from the --system instance */
2216 log_debug("Got cgroup empty notification for: %s", cgroup);
2218 u = manager_get_unit_by_cgroup(m, cgroup);
2222 unit_add_to_cgroup_empty_queue(u);
2226 int manager_notify_cgroup_empty(Manager *m, const char *cgroup) {
2232 log_debug("Got cgroup empty notification for: %s", cgroup);
2234 s = hashmap_get(m->sessions, cgroup);
2237 session_finalize(s);
2240 log_warning("Session not found: %s", cgroup);
2245 #if 0 /// UNNEEDED by elogind
2246 int unit_get_memory_current(Unit *u, uint64_t *ret) {
2247 _cleanup_free_ char *v = NULL;
2253 if (!UNIT_CGROUP_BOOL(u, memory_accounting))
2256 if (!u->cgroup_path)
2259 if ((u->cgroup_realized_mask & CGROUP_MASK_MEMORY) == 0)
2262 r = cg_all_unified();
2266 r = cg_get_attribute("memory", u->cgroup_path, "memory.current", &v);
2268 r = cg_get_attribute("memory", u->cgroup_path, "memory.usage_in_bytes", &v);
2274 return safe_atou64(v, ret);
2277 int unit_get_tasks_current(Unit *u, uint64_t *ret) {
2278 _cleanup_free_ char *v = NULL;
2284 if (!UNIT_CGROUP_BOOL(u, tasks_accounting))
2287 if (!u->cgroup_path)
2290 if ((u->cgroup_realized_mask & CGROUP_MASK_PIDS) == 0)
2293 r = cg_get_attribute("pids", u->cgroup_path, "pids.current", &v);
2299 return safe_atou64(v, ret);
2302 static int unit_get_cpu_usage_raw(Unit *u, nsec_t *ret) {
2303 _cleanup_free_ char *v = NULL;
2310 if (!u->cgroup_path)
2313 r = cg_all_unified();
2317 const char *keys[] = { "usage_usec", NULL };
2318 _cleanup_free_ char *val = NULL;
2321 if ((u->cgroup_realized_mask & CGROUP_MASK_CPU) == 0)
2324 r = cg_get_keyed_attribute("cpu", u->cgroup_path, "cpu.stat", keys, &val);
2328 r = safe_atou64(val, &us);
2332 ns = us * NSEC_PER_USEC;
2334 if ((u->cgroup_realized_mask & CGROUP_MASK_CPUACCT) == 0)
2337 r = cg_get_attribute("cpuacct", u->cgroup_path, "cpuacct.usage", &v);
2343 r = safe_atou64(v, &ns);
2352 int unit_get_cpu_usage(Unit *u, nsec_t *ret) {
2358 /* Retrieve the current CPU usage counter. This will subtract the CPU counter taken when the unit was
2359 * started. If the cgroup has been removed already, returns the last cached value. To cache the value, simply
2360 * call this function with a NULL return value. */
2362 if (!UNIT_CGROUP_BOOL(u, cpu_accounting))
2365 r = unit_get_cpu_usage_raw(u, &ns);
2366 if (r == -ENODATA && u->cpu_usage_last != NSEC_INFINITY) {
2367 /* If we can't get the CPU usage anymore (because the cgroup was already removed, for example), use our
2371 *ret = u->cpu_usage_last;
2377 if (ns > u->cpu_usage_base)
2378 ns -= u->cpu_usage_base;
2382 u->cpu_usage_last = ns;
2389 int unit_get_ip_accounting(
2391 CGroupIPAccountingMetric metric,
2398 assert(metric >= 0);
2399 assert(metric < _CGROUP_IP_ACCOUNTING_METRIC_MAX);
2402 /* IP accounting is currently not recursive, and hence we refuse to return any data for slice nodes. Slices are
2403 * inner cgroup nodes and hence have no processes directly attached, hence their counters would be zero
2404 * anyway. And if we block this now we can later open this up, if the kernel learns recursive BPF cgroup
2406 if (u->type == UNIT_SLICE)
2409 if (!UNIT_CGROUP_BOOL(u, ip_accounting))
2412 fd = IN_SET(metric, CGROUP_IP_INGRESS_BYTES, CGROUP_IP_INGRESS_PACKETS) ?
2413 u->ip_accounting_ingress_map_fd :
2414 u->ip_accounting_egress_map_fd;
2419 if (IN_SET(metric, CGROUP_IP_INGRESS_BYTES, CGROUP_IP_EGRESS_BYTES))
2420 r = bpf_firewall_read_accounting(fd, &value, NULL);
2422 r = bpf_firewall_read_accounting(fd, NULL, &value);
2426 /* Add in additional metrics from a previous runtime. Note that when reexecing/reloading the daemon we compile
2427 * all BPF programs and maps anew, but serialize the old counters. When deserializing we store them in the
2428 * ip_accounting_extra[] field, and add them in here transparently. */
2430 *ret = value + u->ip_accounting_extra[metric];
2435 int unit_reset_cpu_accounting(Unit *u) {
2441 u->cpu_usage_last = NSEC_INFINITY;
2443 r = unit_get_cpu_usage_raw(u, &ns);
2445 u->cpu_usage_base = 0;
2449 u->cpu_usage_base = ns;
2453 int unit_reset_ip_accounting(Unit *u) {
2458 if (u->ip_accounting_ingress_map_fd >= 0)
2459 r = bpf_firewall_reset_accounting(u->ip_accounting_ingress_map_fd);
2461 if (u->ip_accounting_egress_map_fd >= 0)
2462 q = bpf_firewall_reset_accounting(u->ip_accounting_egress_map_fd);
2464 zero(u->ip_accounting_extra);
2466 return r < 0 ? r : q;
2469 void unit_invalidate_cgroup(Unit *u, CGroupMask m) {
2472 if (!UNIT_HAS_CGROUP_CONTEXT(u))
2478 /* always invalidate compat pairs together */
2479 if (m & (CGROUP_MASK_IO | CGROUP_MASK_BLKIO))
2480 m |= CGROUP_MASK_IO | CGROUP_MASK_BLKIO;
2482 if (m & (CGROUP_MASK_CPU | CGROUP_MASK_CPUACCT))
2483 m |= CGROUP_MASK_CPU | CGROUP_MASK_CPUACCT;
2485 if ((u->cgroup_realized_mask & m) == 0)
2488 u->cgroup_realized_mask &= ~m;
2489 unit_add_to_cgroup_realize_queue(u);
2492 void unit_invalidate_cgroup_bpf(Unit *u) {
2495 if (!UNIT_HAS_CGROUP_CONTEXT(u))
2498 if (u->cgroup_bpf_state == UNIT_CGROUP_BPF_INVALIDATED)
2501 u->cgroup_bpf_state = UNIT_CGROUP_BPF_INVALIDATED;
2502 unit_add_to_cgroup_realize_queue(u);
2504 /* If we are a slice unit, we also need to put compile a new BPF program for all our children, as the IP access
2505 * list of our children includes our own. */
2506 if (u->type == UNIT_SLICE) {
2511 HASHMAP_FOREACH_KEY(v, member, u->dependencies[UNIT_BEFORE], i) {
2515 if (UNIT_DEREF(member->slice) != u)
2518 unit_invalidate_cgroup_bpf(member);
2523 void manager_invalidate_startup_units(Manager *m) {
2529 SET_FOREACH(u, m->startup_units, i)
2530 unit_invalidate_cgroup(u, CGROUP_MASK_CPU|CGROUP_MASK_IO|CGROUP_MASK_BLKIO);
2533 static const char* const cgroup_device_policy_table[_CGROUP_DEVICE_POLICY_MAX] = {
2534 [CGROUP_AUTO] = "auto",
2535 [CGROUP_CLOSED] = "closed",
2536 [CGROUP_STRICT] = "strict",
2539 DEFINE_STRING_TABLE_LOOKUP(cgroup_device_policy, CGroupDevicePolicy);