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 "cgroup-util.h"
29 #include "parse-util.h"
30 #include "path-util.h"
31 #include "process-util.h"
32 //#include "special.h"
33 #include "stdio-util.h"
34 #include "string-table.h"
35 #include "string-util.h"
37 #define CGROUP_CPU_QUOTA_PERIOD_USEC ((usec_t) 100 * USEC_PER_MSEC)
39 #if 0 /// UNNEEDED by elogind
40 static void cgroup_compat_warn(void) {
41 static bool cgroup_compat_warned = false;
43 if (cgroup_compat_warned)
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;
50 #define log_cgroup_compat(unit, fmt, ...) do { \
51 cgroup_compat_warn(); \
52 log_unit_debug(unit, "cgroup-compat: " fmt, ##__VA_ARGS__); \
55 void cgroup_context_init(CGroupContext *c) {
58 /* Initialize everything to the kernel defaults, assuming the
59 * structure is preinitialized to 0 */
61 c->cpu_weight = CGROUP_WEIGHT_INVALID;
62 c->startup_cpu_weight = CGROUP_WEIGHT_INVALID;
63 c->cpu_quota_per_sec_usec = USEC_INFINITY;
65 c->cpu_shares = CGROUP_CPU_SHARES_INVALID;
66 c->startup_cpu_shares = CGROUP_CPU_SHARES_INVALID;
68 c->memory_high = CGROUP_LIMIT_MAX;
69 c->memory_max = CGROUP_LIMIT_MAX;
70 c->memory_swap_max = CGROUP_LIMIT_MAX;
72 c->memory_limit = CGROUP_LIMIT_MAX;
74 c->io_weight = CGROUP_WEIGHT_INVALID;
75 c->startup_io_weight = CGROUP_WEIGHT_INVALID;
77 c->blockio_weight = CGROUP_BLKIO_WEIGHT_INVALID;
78 c->startup_blockio_weight = CGROUP_BLKIO_WEIGHT_INVALID;
80 c->tasks_max = (uint64_t) -1;
83 void cgroup_context_free_device_allow(CGroupContext *c, CGroupDeviceAllow *a) {
87 LIST_REMOVE(device_allow, c->device_allow, a);
92 void cgroup_context_free_io_device_weight(CGroupContext *c, CGroupIODeviceWeight *w) {
96 LIST_REMOVE(device_weights, c->io_device_weights, w);
101 void cgroup_context_free_io_device_limit(CGroupContext *c, CGroupIODeviceLimit *l) {
105 LIST_REMOVE(device_limits, c->io_device_limits, l);
110 void cgroup_context_free_blockio_device_weight(CGroupContext *c, CGroupBlockIODeviceWeight *w) {
114 LIST_REMOVE(device_weights, c->blockio_device_weights, w);
119 void cgroup_context_free_blockio_device_bandwidth(CGroupContext *c, CGroupBlockIODeviceBandwidth *b) {
123 LIST_REMOVE(device_bandwidths, c->blockio_device_bandwidths, b);
128 void cgroup_context_done(CGroupContext *c) {
131 while (c->io_device_weights)
132 cgroup_context_free_io_device_weight(c, c->io_device_weights);
134 while (c->io_device_limits)
135 cgroup_context_free_io_device_limit(c, c->io_device_limits);
137 while (c->blockio_device_weights)
138 cgroup_context_free_blockio_device_weight(c, c->blockio_device_weights);
140 while (c->blockio_device_bandwidths)
141 cgroup_context_free_blockio_device_bandwidth(c, c->blockio_device_bandwidths);
143 while (c->device_allow)
144 cgroup_context_free_device_allow(c, c->device_allow);
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);
150 void cgroup_context_dump(CGroupContext *c, FILE* f, const char *prefix) {
151 CGroupIODeviceLimit *il;
152 CGroupIODeviceWeight *iw;
153 CGroupBlockIODeviceBandwidth *b;
154 CGroupBlockIODeviceWeight *w;
155 CGroupDeviceAllow *a;
156 IPAddressAccessItem *iaai;
157 char u[FORMAT_TIMESPAN_MAX];
162 prefix = strempty(prefix);
165 "%sCPUAccounting=%s\n"
166 "%sIOAccounting=%s\n"
167 "%sBlockIOAccounting=%s\n"
168 "%sMemoryAccounting=%s\n"
169 "%sTasksAccounting=%s\n"
170 "%sIPAccounting=%s\n"
171 "%sCPUWeight=%" PRIu64 "\n"
172 "%sStartupCPUWeight=%" PRIu64 "\n"
173 "%sCPUShares=%" PRIu64 "\n"
174 "%sStartupCPUShares=%" PRIu64 "\n"
175 "%sCPUQuotaPerSecSec=%s\n"
176 "%sIOWeight=%" PRIu64 "\n"
177 "%sStartupIOWeight=%" PRIu64 "\n"
178 "%sBlockIOWeight=%" PRIu64 "\n"
179 "%sStartupBlockIOWeight=%" PRIu64 "\n"
180 "%sMemoryLow=%" PRIu64 "\n"
181 "%sMemoryHigh=%" PRIu64 "\n"
182 "%sMemoryMax=%" PRIu64 "\n"
183 "%sMemorySwapMax=%" PRIu64 "\n"
184 "%sMemoryLimit=%" PRIu64 "\n"
185 "%sTasksMax=%" PRIu64 "\n"
186 "%sDevicePolicy=%s\n"
188 prefix, yes_no(c->cpu_accounting),
189 prefix, yes_no(c->io_accounting),
190 prefix, yes_no(c->blockio_accounting),
191 prefix, yes_no(c->memory_accounting),
192 prefix, yes_no(c->tasks_accounting),
193 prefix, yes_no(c->ip_accounting),
194 prefix, c->cpu_weight,
195 prefix, c->startup_cpu_weight,
196 prefix, c->cpu_shares,
197 prefix, c->startup_cpu_shares,
198 prefix, format_timespan(u, sizeof(u), c->cpu_quota_per_sec_usec, 1),
199 prefix, c->io_weight,
200 prefix, c->startup_io_weight,
201 prefix, c->blockio_weight,
202 prefix, c->startup_blockio_weight,
203 prefix, c->memory_low,
204 prefix, c->memory_high,
205 prefix, c->memory_max,
206 prefix, c->memory_swap_max,
207 prefix, c->memory_limit,
208 prefix, c->tasks_max,
209 prefix, cgroup_device_policy_to_string(c->device_policy),
210 prefix, yes_no(c->delegate));
212 LIST_FOREACH(device_allow, a, c->device_allow)
214 "%sDeviceAllow=%s %s%s%s\n",
217 a->r ? "r" : "", a->w ? "w" : "", a->m ? "m" : "");
219 LIST_FOREACH(device_weights, iw, c->io_device_weights)
221 "%sIODeviceWeight=%s %" PRIu64,
226 LIST_FOREACH(device_limits, il, c->io_device_limits) {
227 char buf[FORMAT_BYTES_MAX];
228 CGroupIOLimitType type;
230 for (type = 0; type < _CGROUP_IO_LIMIT_TYPE_MAX; type++)
231 if (il->limits[type] != cgroup_io_limit_defaults[type])
235 cgroup_io_limit_type_to_string(type),
237 format_bytes(buf, sizeof(buf), il->limits[type]));
240 LIST_FOREACH(device_weights, w, c->blockio_device_weights)
242 "%sBlockIODeviceWeight=%s %" PRIu64,
247 LIST_FOREACH(device_bandwidths, b, c->blockio_device_bandwidths) {
248 char buf[FORMAT_BYTES_MAX];
250 if (b->rbps != CGROUP_LIMIT_MAX)
252 "%sBlockIOReadBandwidth=%s %s\n",
255 format_bytes(buf, sizeof(buf), b->rbps));
256 if (b->wbps != CGROUP_LIMIT_MAX)
258 "%sBlockIOWriteBandwidth=%s %s\n",
261 format_bytes(buf, sizeof(buf), b->wbps));
264 LIST_FOREACH(items, iaai, c->ip_address_allow) {
265 _cleanup_free_ char *k = NULL;
267 (void) in_addr_to_string(iaai->family, &iaai->address, &k);
268 fprintf(f, "%sIPAddressAllow=%s/%u\n", prefix, strnull(k), iaai->prefixlen);
271 LIST_FOREACH(items, iaai, c->ip_address_deny) {
272 _cleanup_free_ char *k = NULL;
274 (void) in_addr_to_string(iaai->family, &iaai->address, &k);
275 fprintf(f, "%sIPAddressDeny=%s/%u\n", prefix, strnull(k), iaai->prefixlen);
279 static int lookup_block_device(const char *p, dev_t *dev) {
288 return log_warning_errno(errno, "Couldn't stat device %s: %m", p);
290 if (S_ISBLK(st.st_mode))
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 */
297 /* If this is a partition, try to get the originating
299 block_get_whole_disk(*dev, dev);
301 log_warning("%s is not a block device and file system block device cannot be determined or is not local.", p);
308 static int whitelist_device(const char *path, const char *node, const char *acc) {
309 char buf[2+DECIMAL_STR_MAX(dev_t)*2+2+4];
311 bool ignore_notfound;
317 if (node[0] == '-') {
318 /* Non-existent paths starting with "-" must be silently ignored */
320 ignore_notfound = true;
322 ignore_notfound = false;
324 if (stat(node, &st) < 0) {
325 if (errno == ENOENT && ignore_notfound)
328 return log_warning_errno(errno, "Couldn't stat device %s: %m", node);
331 if (!S_ISCHR(st.st_mode) && !S_ISBLK(st.st_mode)) {
332 log_warning("%s is not a device.", node);
338 S_ISCHR(st.st_mode) ? 'c' : 'b',
339 major(st.st_rdev), minor(st.st_rdev),
342 r = cg_set_attribute("devices", path, "devices.allow", buf);
344 log_full_errno(IN_SET(r, -ENOENT, -EROFS, -EINVAL, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
345 "Failed to set devices.allow on %s: %m", path);
350 static int whitelist_major(const char *path, const char *name, char type, const char *acc) {
351 _cleanup_fclose_ FILE *f = NULL;
358 assert(type == 'b' || type == 'c');
360 f = fopen("/proc/devices", "re");
362 return log_warning_errno(errno, "Cannot open /proc/devices to resolve %s (%c): %m", name, type);
364 FOREACH_LINE(line, f, goto fail) {
365 char buf[2+DECIMAL_STR_MAX(unsigned)+3+4], *p, *w;
370 if (type == 'c' && streq(line, "Character devices:")) {
375 if (type == 'b' && streq(line, "Block devices:")) {
390 w = strpbrk(p, WHITESPACE);
395 r = safe_atou(p, &maj);
402 w += strspn(w, WHITESPACE);
404 if (fnmatch(name, w, 0) != 0)
413 r = cg_set_attribute("devices", path, "devices.allow", buf);
415 log_full_errno(IN_SET(r, -ENOENT, -EROFS, -EINVAL, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
416 "Failed to set devices.allow on %s: %m", path);
422 return log_warning_errno(errno, "Failed to read /proc/devices: %m");
425 static bool cgroup_context_has_cpu_weight(CGroupContext *c) {
426 return c->cpu_weight != CGROUP_WEIGHT_INVALID ||
427 c->startup_cpu_weight != CGROUP_WEIGHT_INVALID;
430 static 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;
435 static 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;
442 return CGROUP_WEIGHT_DEFAULT;
445 static 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;
452 return CGROUP_CPU_SHARES_DEFAULT;
455 static 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)];
459 xsprintf(buf, "%" PRIu64 "\n", weight);
460 r = cg_set_attribute("cpu", u->cgroup_path, "cpu.weight", buf);
462 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
463 "Failed to set cpu.weight: %m");
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);
469 xsprintf(buf, "max " USEC_FMT "\n", CGROUP_CPU_QUOTA_PERIOD_USEC);
471 r = cg_set_attribute("cpu", u->cgroup_path, "cpu.max", buf);
474 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
475 "Failed to set cpu.max: %m");
478 static 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];
482 xsprintf(buf, "%" PRIu64 "\n", shares);
483 r = cg_set_attribute("cpu", u->cgroup_path, "cpu.shares", buf);
485 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
486 "Failed to set cpu.shares: %m");
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);
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");
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);
498 r = cg_set_attribute("cpu", u->cgroup_path, "cpu.cfs_quota_us", "-1");
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");
504 static 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);
509 static 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);
514 static bool cgroup_context_has_io_config(CGroupContext *c) {
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 ||
522 static bool cgroup_context_has_blockio_config(CGroupContext *c) {
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;
530 static uint64_t cgroup_context_io_weight(CGroupContext *c, ManagerState state) {
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)
537 return CGROUP_WEIGHT_DEFAULT;
540 static uint64_t cgroup_context_blkio_weight(CGroupContext *c, ManagerState state) {
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;
547 return CGROUP_BLKIO_WEIGHT_DEFAULT;
550 static uint64_t cgroup_weight_blkio_to_io(uint64_t blkio_weight) {
551 return CLAMP(blkio_weight * CGROUP_WEIGHT_DEFAULT / CGROUP_BLKIO_WEIGHT_DEFAULT,
552 CGROUP_WEIGHT_MIN, CGROUP_WEIGHT_MAX);
555 static uint64_t cgroup_weight_io_to_blkio(uint64_t io_weight) {
556 return CLAMP(io_weight * CGROUP_BLKIO_WEIGHT_DEFAULT / CGROUP_WEIGHT_DEFAULT,
557 CGROUP_BLKIO_WEIGHT_MIN, CGROUP_BLKIO_WEIGHT_MAX);
560 static void cgroup_apply_io_device_weight(Unit *u, const char *dev_path, uint64_t io_weight) {
561 char buf[DECIMAL_STR_MAX(dev_t)*2+2+DECIMAL_STR_MAX(uint64_t)+1];
565 r = lookup_block_device(dev_path, &dev);
569 xsprintf(buf, "%u:%u %" PRIu64 "\n", major(dev), minor(dev), io_weight);
570 r = cg_set_attribute("io", u->cgroup_path, "io.weight", buf);
572 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
573 "Failed to set io.weight: %m");
576 static void cgroup_apply_blkio_device_weight(Unit *u, const char *dev_path, uint64_t blkio_weight) {
577 char buf[DECIMAL_STR_MAX(dev_t)*2+2+DECIMAL_STR_MAX(uint64_t)+1];
581 r = lookup_block_device(dev_path, &dev);
585 xsprintf(buf, "%u:%u %" PRIu64 "\n", major(dev), minor(dev), blkio_weight);
586 r = cg_set_attribute("blkio", u->cgroup_path, "blkio.weight_device", buf);
588 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
589 "Failed to set blkio.weight_device: %m");
592 static unsigned cgroup_apply_io_device_limit(Unit *u, const char *dev_path, uint64_t *limits) {
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;
600 r = lookup_block_device(dev_path, &dev);
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]);
609 xsprintf(limit_bufs[type], "%s", limits[type] == CGROUP_LIMIT_MAX ? "max" : "0");
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]);
616 r = cg_set_attribute("io", u->cgroup_path, "io.max", buf);
618 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
619 "Failed to set io.max: %m");
623 static unsigned cgroup_apply_blkio_device_limit(Unit *u, const char *dev_path, uint64_t rbps, uint64_t wbps) {
624 char buf[DECIMAL_STR_MAX(dev_t)*2+2+DECIMAL_STR_MAX(uint64_t)+1];
629 r = lookup_block_device(dev_path, &dev);
633 if (rbps != CGROUP_LIMIT_MAX)
635 sprintf(buf, "%u:%u %" PRIu64 "\n", major(dev), minor(dev), rbps);
636 r = cg_set_attribute("blkio", u->cgroup_path, "blkio.throttle.read_bps_device", buf);
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");
641 if (wbps != CGROUP_LIMIT_MAX)
643 sprintf(buf, "%u:%u %" PRIu64 "\n", major(dev), minor(dev), wbps);
644 r = cg_set_attribute("blkio", u->cgroup_path, "blkio.throttle.write_bps_device", buf);
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");
652 static bool cgroup_context_has_unified_memory_config(CGroupContext *c) {
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;
656 static void cgroup_apply_unified_memory_limit(Unit *u, const char *file, uint64_t v) {
657 char buf[DECIMAL_STR_MAX(uint64_t) + 1] = "max";
660 if (v != CGROUP_LIMIT_MAX)
661 xsprintf(buf, "%" PRIu64 "\n", v);
663 r = cg_set_attribute("memory", u->cgroup_path, file, buf);
665 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
666 "Failed to set %s: %m", file);
669 static void cgroup_apply_firewall(Unit *u, CGroupContext *c) {
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 */
676 r = bpf_firewall_compile(u);
680 (void) bpf_firewall_install(u);
684 static void cgroup_context_apply(
686 CGroupMask apply_mask,
688 ManagerState state) {
697 c = unit_get_cgroup_context(u);
698 path = u->cgroup_path;
703 /* Nothing to do? Exit early! */
704 if (apply_mask == 0 && !apply_bpf)
707 /* Some cgroup attributes are not supported on the root cgroup,
708 * hence silently ignore */
709 is_root = isempty(path) || path_equal(path, "/");
711 /* Make sure we don't try to display messages with an empty path. */
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. */
718 if ((apply_mask & CGROUP_MASK_CPU) && !is_root) {
719 bool has_weight, has_shares;
721 has_weight = cgroup_context_has_cpu_weight(c);
722 has_shares = cgroup_context_has_cpu_shares(c);
724 if (cg_all_unified() > 0) {
728 weight = cgroup_context_cpu_weight(c, state);
729 else if (has_shares) {
730 uint64_t shares = cgroup_context_cpu_shares(c, state);
732 weight = cgroup_cpu_shares_to_weight(shares);
734 log_cgroup_compat(u, "Applying [Startup]CpuShares %" PRIu64 " as [Startup]CpuWeight %" PRIu64 " on %s",
735 shares, weight, path);
737 weight = CGROUP_WEIGHT_DEFAULT;
739 cgroup_apply_unified_cpu_config(u, weight, c->cpu_quota_per_sec_usec);
744 uint64_t weight = cgroup_context_cpu_weight(c, state);
746 shares = cgroup_cpu_weight_to_shares(weight);
748 log_cgroup_compat(u, "Applying [Startup]CpuWeight %" PRIu64 " as [Startup]CpuShares %" PRIu64 " on %s",
749 weight, shares, path);
750 } else if (has_shares)
751 shares = cgroup_context_cpu_shares(c, state);
753 shares = CGROUP_CPU_SHARES_DEFAULT;
755 cgroup_apply_legacy_cpu_config(u, shares, c->cpu_quota_per_sec_usec);
759 if (apply_mask & CGROUP_MASK_IO) {
760 bool has_io = cgroup_context_has_io_config(c);
761 bool has_blockio = cgroup_context_has_blockio_config(c);
764 char buf[8+DECIMAL_STR_MAX(uint64_t)+1];
768 weight = cgroup_context_io_weight(c, state);
769 else if (has_blockio) {
770 uint64_t blkio_weight = cgroup_context_blkio_weight(c, state);
772 weight = cgroup_weight_blkio_to_io(blkio_weight);
774 log_cgroup_compat(u, "Applying [Startup]BlockIOWeight %" PRIu64 " as [Startup]IOWeight %" PRIu64,
775 blkio_weight, weight);
777 weight = CGROUP_WEIGHT_DEFAULT;
779 xsprintf(buf, "default %" PRIu64 "\n", weight);
780 r = cg_set_attribute("io", path, "io.weight", buf);
782 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
783 "Failed to set io.weight: %m");
786 CGroupIODeviceWeight *w;
788 /* FIXME: no way to reset this list */
789 LIST_FOREACH(device_weights, w, c->io_device_weights)
790 cgroup_apply_io_device_weight(u, w->path, w->weight);
791 } else if (has_blockio) {
792 CGroupBlockIODeviceWeight *w;
794 /* FIXME: no way to reset this list */
795 LIST_FOREACH(device_weights, w, c->blockio_device_weights) {
796 weight = cgroup_weight_blkio_to_io(w->weight);
798 log_cgroup_compat(u, "Applying BlockIODeviceWeight %" PRIu64 " as IODeviceWeight %" PRIu64 " for %s",
799 w->weight, weight, w->path);
801 cgroup_apply_io_device_weight(u, w->path, weight);
806 /* Apply limits and free ones without config. */
808 CGroupIODeviceLimit *l, *next;
810 LIST_FOREACH_SAFE(device_limits, l, next, c->io_device_limits) {
811 if (!cgroup_apply_io_device_limit(u, l->path, l->limits))
812 cgroup_context_free_io_device_limit(c, l);
814 } else if (has_blockio) {
815 CGroupBlockIODeviceBandwidth *b, *next;
817 LIST_FOREACH_SAFE(device_bandwidths, b, next, c->blockio_device_bandwidths) {
818 uint64_t limits[_CGROUP_IO_LIMIT_TYPE_MAX];
819 CGroupIOLimitType type;
821 for (type = 0; type < _CGROUP_IO_LIMIT_TYPE_MAX; type++)
822 limits[type] = cgroup_io_limit_defaults[type];
824 limits[CGROUP_IO_RBPS_MAX] = b->rbps;
825 limits[CGROUP_IO_WBPS_MAX] = b->wbps;
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);
830 if (!cgroup_apply_io_device_limit(u, b->path, limits))
831 cgroup_context_free_blockio_device_bandwidth(c, b);
836 if (apply_mask & CGROUP_MASK_BLKIO) {
837 bool has_io = cgroup_context_has_io_config(c);
838 bool has_blockio = cgroup_context_has_blockio_config(c);
841 char buf[DECIMAL_STR_MAX(uint64_t)+1];
845 uint64_t io_weight = cgroup_context_io_weight(c, state);
847 weight = cgroup_weight_io_to_blkio(cgroup_context_io_weight(c, state));
849 log_cgroup_compat(u, "Applying [Startup]IOWeight %" PRIu64 " as [Startup]BlockIOWeight %" PRIu64,
851 } else if (has_blockio)
852 weight = cgroup_context_blkio_weight(c, state);
854 weight = CGROUP_BLKIO_WEIGHT_DEFAULT;
856 xsprintf(buf, "%" PRIu64 "\n", weight);
857 r = cg_set_attribute("blkio", path, "blkio.weight", buf);
859 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
860 "Failed to set blkio.weight: %m");
863 CGroupIODeviceWeight *w;
865 /* FIXME: no way to reset this list */
866 LIST_FOREACH(device_weights, w, c->io_device_weights) {
867 weight = cgroup_weight_io_to_blkio(w->weight);
869 log_cgroup_compat(u, "Applying IODeviceWeight %" PRIu64 " as BlockIODeviceWeight %" PRIu64 " for %s",
870 w->weight, weight, w->path);
872 cgroup_apply_blkio_device_weight(u, w->path, weight);
874 } else if (has_blockio) {
875 CGroupBlockIODeviceWeight *w;
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);
883 /* Apply limits and free ones without config. */
885 CGroupIODeviceLimit *l, *next;
887 LIST_FOREACH_SAFE(device_limits, l, next, c->io_device_limits) {
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);
891 if (!cgroup_apply_blkio_device_limit(u, l->path, l->limits[CGROUP_IO_RBPS_MAX], l->limits[CGROUP_IO_WBPS_MAX]))
892 cgroup_context_free_io_device_limit(c, l);
894 } else if (has_blockio) {
895 CGroupBlockIODeviceBandwidth *b, *next;
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);
903 if ((apply_mask & CGROUP_MASK_MEMORY) && !is_root) {
904 if (cg_all_unified() > 0) {
905 uint64_t max, swap_max = CGROUP_LIMIT_MAX;
907 if (cgroup_context_has_unified_memory_config(c)) {
909 swap_max = c->memory_swap_max;
911 max = c->memory_limit;
913 if (max != CGROUP_LIMIT_MAX)
914 log_cgroup_compat(u, "Applying MemoryLimit %" PRIu64 " as MemoryMax", max);
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);
920 cgroup_apply_unified_memory_limit(u, "memory.swap.max", swap_max);
922 char buf[DECIMAL_STR_MAX(uint64_t) + 1];
925 if (cgroup_context_has_unified_memory_config(c)) {
927 log_cgroup_compat(u, "Applying MemoryMax %" PRIi64 " as MemoryLimit", val);
929 val = c->memory_limit;
931 if (val == CGROUP_LIMIT_MAX)
932 strncpy(buf, "-1\n", sizeof(buf));
934 xsprintf(buf, "%" PRIu64 "\n", val);
936 r = cg_set_attribute("memory", path, "memory.limit_in_bytes", buf);
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");
943 if ((apply_mask & CGROUP_MASK_DEVICES) && !is_root) {
944 CGroupDeviceAllow *a;
946 /* Changing the devices list of a populated cgroup
947 * might result in EINVAL, hence ignore EINVAL
950 if (c->device_allow || c->device_policy != CGROUP_AUTO)
951 r = cg_set_attribute("devices", path, "devices.deny", "a");
953 r = cg_set_attribute("devices", path, "devices.allow", "a");
955 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EINVAL, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
956 "Failed to reset devices.list: %m");
958 if (c->device_policy == CGROUP_CLOSED ||
959 (c->device_policy == CGROUP_AUTO && c->device_allow)) {
960 static const char auto_devices[] =
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"
967 "/dev/pts/ptmx\0" "rw\0" /* /dev/pts/ptmx may not be duplicated, but accessed */
968 /* Allow /run/elogind/inaccessible/{chr,blk} devices for mapping InaccessiblePaths */
969 /* Allow /run/systemd/inaccessible/{chr,blk} devices for mapping InaccessiblePaths */
970 "-/run/systemd/inaccessible/chr\0" "rwm\0"
971 "-/run/systemd/inaccessible/blk\0" "rwm\0";
975 NULSTR_FOREACH_PAIR(x, y, auto_devices)
976 whitelist_device(path, x, y);
978 whitelist_major(path, "pts", 'c', "rw");
981 LIST_FOREACH(device_allow, a, c->device_allow) {
997 if (path_startswith(a->path, "/dev/"))
998 whitelist_device(path, a->path, acc);
999 else if ((val = startswith(a->path, "block-")))
1000 whitelist_major(path, val, 'b', acc);
1001 else if ((val = startswith(a->path, "char-")))
1002 whitelist_major(path, val, 'c', acc);
1004 log_unit_debug(u, "Ignoring device %s while writing cgroup attribute.", a->path);
1008 if ((apply_mask & CGROUP_MASK_PIDS) && !is_root) {
1010 if (c->tasks_max != CGROUP_LIMIT_MAX) {
1011 char buf[DECIMAL_STR_MAX(uint64_t) + 2];
1013 sprintf(buf, "%" PRIu64 "\n", c->tasks_max);
1014 r = cg_set_attribute("pids", path, "pids.max", buf);
1016 r = cg_set_attribute("pids", path, "pids.max", "max");
1019 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
1020 "Failed to set pids.max: %m");
1024 cgroup_apply_firewall(u, c);
1027 CGroupMask cgroup_context_get_mask(CGroupContext *c) {
1028 CGroupMask mask = 0;
1030 /* Figure out which controllers we need */
1032 if (c->cpu_accounting ||
1033 cgroup_context_has_cpu_weight(c) ||
1034 cgroup_context_has_cpu_shares(c) ||
1035 c->cpu_quota_per_sec_usec != USEC_INFINITY)
1036 mask |= CGROUP_MASK_CPUACCT | CGROUP_MASK_CPU;
1038 if (cgroup_context_has_io_config(c) || cgroup_context_has_blockio_config(c))
1039 mask |= CGROUP_MASK_IO | CGROUP_MASK_BLKIO;
1041 if (c->memory_accounting ||
1042 c->memory_limit != CGROUP_LIMIT_MAX ||
1043 cgroup_context_has_unified_memory_config(c))
1044 mask |= CGROUP_MASK_MEMORY;
1046 if (c->device_allow ||
1047 c->device_policy != CGROUP_AUTO)
1048 mask |= CGROUP_MASK_DEVICES;
1050 if (c->tasks_accounting ||
1051 c->tasks_max != (uint64_t) -1)
1052 mask |= CGROUP_MASK_PIDS;
1057 CGroupMask unit_get_own_mask(Unit *u) {
1060 /* Returns the mask of controllers the unit needs for itself */
1062 c = unit_get_cgroup_context(u);
1066 /* If delegation is turned on, then turn on all cgroups,
1067 * unless we are on the legacy hierarchy and the process we
1068 * fork into it is known to drop privileges, and hence
1069 * shouldn't get access to the controllers.
1071 * Note that on the unified hierarchy it is safe to delegate
1072 * controllers to unprivileged services. */
1077 e = unit_get_exec_context(u);
1079 exec_context_maintains_privileges(e) ||
1080 cg_all_unified() > 0)
1081 return _CGROUP_MASK_ALL;
1084 return cgroup_context_get_mask(c);
1087 CGroupMask unit_get_members_mask(Unit *u) {
1090 /* Returns the mask of controllers all of the unit's children
1091 * require, merged */
1093 if (u->cgroup_members_mask_valid)
1094 return u->cgroup_members_mask;
1096 u->cgroup_members_mask = 0;
1098 if (u->type == UNIT_SLICE) {
1102 SET_FOREACH(member, u->dependencies[UNIT_BEFORE], i) {
1107 if (UNIT_DEREF(member->slice) != u)
1110 u->cgroup_members_mask |=
1111 unit_get_own_mask(member) |
1112 unit_get_members_mask(member);
1116 u->cgroup_members_mask_valid = true;
1117 return u->cgroup_members_mask;
1120 CGroupMask unit_get_siblings_mask(Unit *u) {
1123 /* Returns the mask of controllers all of the unit's siblings
1124 * require, i.e. the members mask of the unit's parent slice
1125 * if there is one. */
1127 if (UNIT_ISSET(u->slice))
1128 return unit_get_members_mask(UNIT_DEREF(u->slice));
1130 return unit_get_own_mask(u) | unit_get_members_mask(u);
1133 CGroupMask unit_get_subtree_mask(Unit *u) {
1135 /* Returns the mask of this subtree, meaning of the group
1136 * itself and its children. */
1138 return unit_get_own_mask(u) | unit_get_members_mask(u);
1141 CGroupMask unit_get_target_mask(Unit *u) {
1144 /* This returns the cgroup mask of all controllers to enable
1145 * for a specific cgroup, i.e. everything it needs itself,
1146 * plus all that its children need, plus all that its siblings
1147 * need. This is primarily useful on the legacy cgroup
1148 * hierarchy, where we need to duplicate each cgroup in each
1149 * hierarchy that shall be enabled for it. */
1151 mask = unit_get_own_mask(u) | unit_get_members_mask(u) | unit_get_siblings_mask(u);
1152 mask &= u->manager->cgroup_supported;
1157 CGroupMask unit_get_enable_mask(Unit *u) {
1160 /* This returns the cgroup mask of all controllers to enable
1161 * for the children of a specific cgroup. This is primarily
1162 * useful for the unified cgroup hierarchy, where each cgroup
1163 * controls which controllers are enabled for its children. */
1165 mask = unit_get_members_mask(u);
1166 mask &= u->manager->cgroup_supported;
1171 bool unit_get_needs_bpf(Unit *u) {
1176 /* We never attach BPF to slice units, as they are inner cgroup nodes and cgroup/BPF is not recursive at the
1178 if (u->type == UNIT_SLICE)
1181 c = unit_get_cgroup_context(u);
1185 if (c->ip_accounting ||
1186 c->ip_address_allow ||
1190 /* If any parent slice has an IP access list defined, it applies too */
1191 for (p = UNIT_DEREF(u->slice); p; p = UNIT_DEREF(p->slice)) {
1192 c = unit_get_cgroup_context(p);
1196 if (c->ip_address_allow ||
1204 /* Recurse from a unit up through its containing slices, propagating
1205 * mask bits upward. A unit is also member of itself. */
1206 void unit_update_cgroup_members_masks(Unit *u) {
1212 /* Calculate subtree mask */
1213 m = unit_get_subtree_mask(u);
1215 /* See if anything changed from the previous invocation. If
1216 * not, we're done. */
1217 if (u->cgroup_subtree_mask_valid && m == u->cgroup_subtree_mask)
1221 u->cgroup_subtree_mask_valid &&
1222 ((m & ~u->cgroup_subtree_mask) != 0) &&
1223 ((~m & u->cgroup_subtree_mask) == 0);
1225 u->cgroup_subtree_mask = m;
1226 u->cgroup_subtree_mask_valid = true;
1228 if (UNIT_ISSET(u->slice)) {
1229 Unit *s = UNIT_DEREF(u->slice);
1232 /* There's more set now than before. We
1233 * propagate the new mask to the parent's mask
1234 * (not caring if it actually was valid or
1237 s->cgroup_members_mask |= m;
1240 /* There's less set now than before (or we
1241 * don't know), we need to recalculate
1242 * everything, so let's invalidate the
1243 * parent's members mask */
1245 s->cgroup_members_mask_valid = false;
1247 /* And now make sure that this change also hits our
1249 unit_update_cgroup_members_masks(s);
1253 static const char *migrate_callback(CGroupMask mask, void *userdata) {
1260 if (u->cgroup_path &&
1261 u->cgroup_realized &&
1262 (u->cgroup_realized_mask & mask) == mask)
1263 return u->cgroup_path;
1265 u = UNIT_DEREF(u->slice);
1271 char *unit_default_cgroup_path(Unit *u) {
1272 _cleanup_free_ char *escaped = NULL, *slice = NULL;
1277 if (unit_has_name(u, SPECIAL_ROOT_SLICE))
1278 return strdup(u->manager->cgroup_root);
1280 if (UNIT_ISSET(u->slice) && !unit_has_name(UNIT_DEREF(u->slice), SPECIAL_ROOT_SLICE)) {
1281 r = cg_slice_to_path(UNIT_DEREF(u->slice)->id, &slice);
1286 escaped = cg_escape(u->id);
1291 return strjoin(u->manager->cgroup_root, "/", slice, "/",
1294 return strjoin(u->manager->cgroup_root, "/", escaped);
1297 int unit_set_cgroup_path(Unit *u, const char *path) {
1298 _cleanup_free_ char *p = NULL;
1310 if (streq_ptr(u->cgroup_path, p))
1314 r = hashmap_put(u->manager->cgroup_unit, p, u);
1319 unit_release_cgroup(u);
1327 int unit_watch_cgroup(Unit *u) {
1328 _cleanup_free_ char *events = NULL;
1333 if (!u->cgroup_path)
1336 if (u->cgroup_inotify_wd >= 0)
1339 /* Only applies to the unified hierarchy */
1340 r = cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER);
1342 return log_error_errno(r, "Failed to determine whether the name=systemd hierarchy is unified: %m");
1346 /* Don't watch the root slice, it's pointless. */
1347 if (unit_has_name(u, SPECIAL_ROOT_SLICE))
1350 r = hashmap_ensure_allocated(&u->manager->cgroup_inotify_wd_unit, &trivial_hash_ops);
1354 r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, "cgroup.events", &events);
1358 u->cgroup_inotify_wd = inotify_add_watch(u->manager->cgroup_inotify_fd, events, IN_MODIFY);
1359 if (u->cgroup_inotify_wd < 0) {
1361 if (errno == ENOENT) /* If the directory is already
1362 * gone we don't need to track
1363 * it, so this is not an error */
1366 return log_unit_error_errno(u, errno, "Failed to add inotify watch descriptor for control group %s: %m", u->cgroup_path);
1369 r = hashmap_put(u->manager->cgroup_inotify_wd_unit, INT_TO_PTR(u->cgroup_inotify_wd), u);
1371 return log_unit_error_errno(u, r, "Failed to add inotify watch descriptor to hash map: %m");
1376 static int unit_create_cgroup(
1378 CGroupMask target_mask,
1379 CGroupMask enable_mask,
1387 c = unit_get_cgroup_context(u);
1391 if (!u->cgroup_path) {
1392 _cleanup_free_ char *path = NULL;
1394 path = unit_default_cgroup_path(u);
1398 r = unit_set_cgroup_path(u, path);
1400 return log_unit_error_errno(u, r, "Control group %s exists already.", path);
1402 return log_unit_error_errno(u, r, "Failed to set unit's control group path to %s: %m", path);
1405 /* First, create our own group */
1406 r = cg_create_everywhere(u->manager->cgroup_supported, target_mask, u->cgroup_path);
1408 return log_unit_error_errno(u, r, "Failed to create cgroup %s: %m", u->cgroup_path);
1410 /* Start watching it */
1411 (void) unit_watch_cgroup(u);
1413 /* Enable all controllers we need */
1414 r = cg_enable_everywhere(u->manager->cgroup_supported, enable_mask, u->cgroup_path);
1416 log_unit_warning_errno(u, r, "Failed to enable controllers on cgroup %s, ignoring: %m", u->cgroup_path);
1418 /* Keep track that this is now realized */
1419 u->cgroup_realized = true;
1420 u->cgroup_realized_mask = target_mask;
1421 u->cgroup_enabled_mask = enable_mask;
1422 u->cgroup_bpf_state = needs_bpf ? UNIT_CGROUP_BPF_ON : UNIT_CGROUP_BPF_OFF;
1424 if (u->type != UNIT_SLICE && !c->delegate) {
1426 /* Then, possibly move things over, but not if
1427 * subgroups may contain processes, which is the case
1428 * for slice and delegation units. */
1429 r = cg_migrate_everywhere(u->manager->cgroup_supported, u->cgroup_path, u->cgroup_path, migrate_callback, u);
1431 log_unit_warning_errno(u, r, "Failed to migrate cgroup from to %s, ignoring: %m", u->cgroup_path);
1437 int unit_attach_pids_to_cgroup(Unit *u) {
1441 r = unit_realize_cgroup(u);
1445 r = cg_attach_many_everywhere(u->manager->cgroup_supported, u->cgroup_path, u->pids, migrate_callback, u);
1452 static void cgroup_xattr_apply(Unit *u) {
1453 char ids[SD_ID128_STRING_MAX];
1458 if (!MANAGER_IS_SYSTEM(u->manager))
1461 if (sd_id128_is_null(u->invocation_id))
1464 r = cg_set_xattr(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path,
1465 "trusted.invocation_id",
1466 sd_id128_to_string(u->invocation_id, ids), 32,
1469 log_unit_warning_errno(u, r, "Failed to set invocation ID on control group %s, ignoring: %m", u->cgroup_path);
1472 static bool unit_has_mask_realized(
1474 CGroupMask target_mask,
1475 CGroupMask enable_mask,
1480 return u->cgroup_realized &&
1481 u->cgroup_realized_mask == target_mask &&
1482 u->cgroup_enabled_mask == enable_mask &&
1483 ((needs_bpf && u->cgroup_bpf_state == UNIT_CGROUP_BPF_ON) ||
1484 (!needs_bpf && u->cgroup_bpf_state == UNIT_CGROUP_BPF_OFF));
1487 /* Check if necessary controllers and attributes for a unit are in place.
1489 * If so, do nothing.
1490 * If not, create paths, move processes over, and set attributes.
1492 * Returns 0 on success and < 0 on failure. */
1493 static int unit_realize_cgroup_now(Unit *u, ManagerState state) {
1494 CGroupMask target_mask, enable_mask;
1495 bool needs_bpf, apply_bpf;
1500 if (u->in_cgroup_realize_queue) {
1501 LIST_REMOVE(cgroup_realize_queue, u->manager->cgroup_realize_queue, u);
1502 u->in_cgroup_realize_queue = false;
1505 target_mask = unit_get_target_mask(u);
1506 enable_mask = unit_get_enable_mask(u);
1507 needs_bpf = unit_get_needs_bpf(u);
1509 if (unit_has_mask_realized(u, target_mask, enable_mask, needs_bpf))
1512 /* Make sure we apply the BPF filters either when one is configured, or if none is configured but previously
1513 * the state was anything but off. This way, if a unit with a BPF filter applied is reconfigured to lose it
1514 * this will trickle down properly to cgroupfs. */
1515 apply_bpf = needs_bpf || u->cgroup_bpf_state != UNIT_CGROUP_BPF_OFF;
1517 /* First, realize parents */
1518 if (UNIT_ISSET(u->slice)) {
1519 r = unit_realize_cgroup_now(UNIT_DEREF(u->slice), state);
1524 /* And then do the real work */
1525 r = unit_create_cgroup(u, target_mask, enable_mask, needs_bpf);
1529 /* Finally, apply the necessary attributes. */
1530 cgroup_context_apply(u, target_mask, apply_bpf, state);
1531 cgroup_xattr_apply(u);
1536 static void unit_add_to_cgroup_realize_queue(Unit *u) {
1539 if (u->in_cgroup_realize_queue)
1542 LIST_PREPEND(cgroup_realize_queue, u->manager->cgroup_realize_queue, u);
1543 u->in_cgroup_realize_queue = true;
1546 unsigned manager_dispatch_cgroup_realize_queue(Manager *m) {
1554 state = manager_state(m);
1556 while ((i = m->cgroup_realize_queue)) {
1557 assert(i->in_cgroup_realize_queue);
1559 r = unit_realize_cgroup_now(i, state);
1561 log_warning_errno(r, "Failed to realize cgroups for queued unit %s, ignoring: %m", i->id);
1569 static void unit_add_siblings_to_cgroup_realize_queue(Unit *u) {
1572 /* This adds the siblings of the specified unit and the
1573 * siblings of all parent units to the cgroup queue. (But
1574 * neither the specified unit itself nor the parents.) */
1576 while ((slice = UNIT_DEREF(u->slice))) {
1580 SET_FOREACH(m, slice->dependencies[UNIT_BEFORE], i) {
1584 /* Skip units that have a dependency on the slice
1585 * but aren't actually in it. */
1586 if (UNIT_DEREF(m->slice) != slice)
1589 /* No point in doing cgroup application for units
1590 * without active processes. */
1591 if (UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(m)))
1594 /* If the unit doesn't need any new controllers
1595 * and has current ones realized, it doesn't need
1597 if (unit_has_mask_realized(m,
1598 unit_get_target_mask(m),
1599 unit_get_enable_mask(m),
1600 unit_get_needs_bpf(m)))
1603 unit_add_to_cgroup_realize_queue(m);
1610 int unit_realize_cgroup(Unit *u) {
1613 if (!UNIT_HAS_CGROUP_CONTEXT(u))
1616 /* So, here's the deal: when realizing the cgroups for this
1617 * unit, we need to first create all parents, but there's more
1618 * actually: for the weight-based controllers we also need to
1619 * make sure that all our siblings (i.e. units that are in the
1620 * same slice as we are) have cgroups, too. Otherwise, things
1621 * would become very uneven as each of their processes would
1622 * get as much resources as all our group together. This call
1623 * will synchronously create the parent cgroups, but will
1624 * defer work on the siblings to the next event loop
1627 /* Add all sibling slices to the cgroup queue. */
1628 unit_add_siblings_to_cgroup_realize_queue(u);
1630 /* And realize this one now (and apply the values) */
1631 return unit_realize_cgroup_now(u, manager_state(u->manager));
1634 void unit_release_cgroup(Unit *u) {
1637 /* Forgets all cgroup details for this cgroup */
1639 if (u->cgroup_path) {
1640 (void) hashmap_remove(u->manager->cgroup_unit, u->cgroup_path);
1641 u->cgroup_path = mfree(u->cgroup_path);
1644 if (u->cgroup_inotify_wd >= 0) {
1645 if (inotify_rm_watch(u->manager->cgroup_inotify_fd, u->cgroup_inotify_wd) < 0)
1646 log_unit_debug_errno(u, errno, "Failed to remove cgroup inotify watch %i for %s, ignoring", u->cgroup_inotify_wd, u->id);
1648 (void) hashmap_remove(u->manager->cgroup_inotify_wd_unit, INT_TO_PTR(u->cgroup_inotify_wd));
1649 u->cgroup_inotify_wd = -1;
1653 void unit_prune_cgroup(Unit *u) {
1659 /* Removes the cgroup, if empty and possible, and stops watching it. */
1661 if (!u->cgroup_path)
1664 (void) unit_get_cpu_usage(u, NULL); /* Cache the last CPU usage value before we destroy the cgroup */
1666 is_root_slice = unit_has_name(u, SPECIAL_ROOT_SLICE);
1668 r = cg_trim_everywhere(u->manager->cgroup_supported, u->cgroup_path, !is_root_slice);
1670 log_unit_debug_errno(u, r, "Failed to destroy cgroup %s, ignoring: %m", u->cgroup_path);
1677 unit_release_cgroup(u);
1679 u->cgroup_realized = false;
1680 u->cgroup_realized_mask = 0;
1681 u->cgroup_enabled_mask = 0;
1684 int unit_search_main_pid(Unit *u, pid_t *ret) {
1685 _cleanup_fclose_ FILE *f = NULL;
1686 pid_t pid = 0, npid, mypid;
1692 if (!u->cgroup_path)
1695 r = cg_enumerate_processes(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, &f);
1699 mypid = getpid_cached();
1700 while (cg_read_pid(f, &npid) > 0) {
1706 /* Ignore processes that aren't our kids */
1707 if (get_process_ppid(npid, &ppid) >= 0 && ppid != mypid)
1711 /* Dang, there's more than one daemonized PID
1712 in this group, so we don't know what process
1713 is the main process. */
1724 static int unit_watch_pids_in_path(Unit *u, const char *path) {
1725 _cleanup_closedir_ DIR *d = NULL;
1726 _cleanup_fclose_ FILE *f = NULL;
1732 r = cg_enumerate_processes(SYSTEMD_CGROUP_CONTROLLER, path, &f);
1738 while ((r = cg_read_pid(f, &pid)) > 0) {
1739 r = unit_watch_pid(u, pid);
1740 if (r < 0 && ret >= 0)
1744 if (r < 0 && ret >= 0)
1748 r = cg_enumerate_subgroups(SYSTEMD_CGROUP_CONTROLLER, path, &d);
1755 while ((r = cg_read_subgroup(d, &fn)) > 0) {
1756 _cleanup_free_ char *p = NULL;
1758 p = strjoin(path, "/", fn);
1764 r = unit_watch_pids_in_path(u, p);
1765 if (r < 0 && ret >= 0)
1769 if (r < 0 && ret >= 0)
1776 int unit_watch_all_pids(Unit *u) {
1781 /* Adds all PIDs from our cgroup to the set of PIDs we
1782 * watch. This is a fallback logic for cases where we do not
1783 * get reliable cgroup empty notifications: we try to use
1784 * SIGCHLD as replacement. */
1786 if (!u->cgroup_path)
1789 r = cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER);
1792 if (r > 0) /* On unified we can use proper notifications */
1795 return unit_watch_pids_in_path(u, u->cgroup_path);
1798 static int on_cgroup_empty_event(sd_event_source *s, void *userdata) {
1799 Manager *m = userdata;
1806 u = m->cgroup_empty_queue;
1810 assert(u->in_cgroup_empty_queue);
1811 u->in_cgroup_empty_queue = false;
1812 LIST_REMOVE(cgroup_empty_queue, m->cgroup_empty_queue, u);
1814 if (m->cgroup_empty_queue) {
1815 /* More stuff queued, let's make sure we remain enabled */
1816 r = sd_event_source_set_enabled(s, SD_EVENT_ONESHOT);
1818 log_debug_errno(r, "Failed to reenable cgroup empty event source: %m");
1821 unit_add_to_gc_queue(u);
1823 if (UNIT_VTABLE(u)->notify_cgroup_empty)
1824 UNIT_VTABLE(u)->notify_cgroup_empty(u);
1829 void unit_add_to_cgroup_empty_queue(Unit *u) {
1834 /* Note that there are four different ways how cgroup empty events reach us:
1836 * 1. On the unified hierarchy we get an inotify event on the cgroup
1838 * 2. On the legacy hierarchy, when running in system mode, we get a datagram on the cgroup agent socket
1840 * 3. On the legacy hierarchy, when running in user mode, we get a D-Bus signal on the system bus
1842 * 4. On the legacy hierarchy, in service units we start watching all processes of the cgroup for SIGCHLD as
1843 * soon as we get one SIGCHLD, to deal with unreliable cgroup notifications.
1845 * Regardless which way we got the notification, we'll verify it here, and then add it to a separate
1846 * queue. This queue will be dispatched at a lower priority than the SIGCHLD handler, so that we always use
1847 * SIGCHLD if we can get it first, and only use the cgroup empty notifications if there's no SIGCHLD pending
1848 * (which might happen if the cgroup doesn't contain processes that are our own child, which is typically the
1849 * case for scope units). */
1851 if (u->in_cgroup_empty_queue)
1854 /* Let's verify that the cgroup is really empty */
1855 if (!u->cgroup_path)
1857 r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path);
1859 log_unit_debug_errno(u, r, "Failed to determine whether cgroup %s is empty: %m", u->cgroup_path);
1865 LIST_PREPEND(cgroup_empty_queue, u->manager->cgroup_empty_queue, u);
1866 u->in_cgroup_empty_queue = true;
1868 /* Trigger the defer event */
1869 r = sd_event_source_set_enabled(u->manager->cgroup_empty_event_source, SD_EVENT_ONESHOT);
1871 log_debug_errno(r, "Failed to enable cgroup empty event source: %m");
1874 static int on_cgroup_inotify_event(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
1875 Manager *m = userdata;
1882 union inotify_event_buffer buffer;
1883 struct inotify_event *e;
1886 l = read(fd, &buffer, sizeof(buffer));
1888 if (errno == EINTR || errno == EAGAIN)
1891 return log_error_errno(errno, "Failed to read control group inotify events: %m");
1894 FOREACH_INOTIFY_EVENT(e, buffer, l) {
1898 /* Queue overflow has no watch descriptor */
1901 if (e->mask & IN_IGNORED)
1902 /* The watch was just removed */
1905 u = hashmap_get(m->cgroup_inotify_wd_unit, INT_TO_PTR(e->wd));
1906 if (!u) /* Not that inotify might deliver
1907 * events for a watch even after it
1908 * was removed, because it was queued
1909 * before the removal. Let's ignore
1910 * this here safely. */
1913 unit_add_to_cgroup_empty_queue(u);
1919 int manager_setup_cgroup(Manager *m) {
1920 _cleanup_free_ char *path = NULL;
1921 const char *scope_path;
1928 /* 1. Determine hierarchy */
1929 m->cgroup_root = mfree(m->cgroup_root);
1930 #if 0 /// elogind is not init and must therefore search for PID 1 instead of self.
1931 r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 0, &m->cgroup_root);
1933 r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 1, &m->cgroup_root);
1936 return log_error_errno(r, "Cannot determine cgroup we are running in: %m");
1938 #if 0 /// elogind does not support systemd scopes and slices
1939 /* Chop off the init scope, if we are already located in it */
1940 e = endswith(m->cgroup_root, "/" SPECIAL_INIT_SCOPE);
1942 /* LEGACY: Also chop off the system slice if we are in
1943 * it. This is to support live upgrades from older systemd
1944 * versions where PID 1 was moved there. Also see
1945 * cg_get_root_path(). */
1946 if (!e && MANAGER_IS_SYSTEM(m)) {
1947 e = endswith(m->cgroup_root, "/" SPECIAL_SYSTEM_SLICE);
1949 e = endswith(m->cgroup_root, "/system"); /* even more legacy */
1955 /* And make sure to store away the root value without trailing
1956 * slash, even for the root dir, so that we can easily prepend
1958 while ((e = endswith(m->cgroup_root, "/")))
1960 log_debug_elogind("Cgroup Controller \"%s\" -> root \"%s\"",
1961 SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root);
1964 r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, NULL, &path);
1966 return log_error_errno(r, "Cannot find cgroup mount point: %m");
1968 r = cg_unified_flush();
1970 return log_error_errno(r, "Couldn't determine if we are running in the unified hierarchy: %m");
1972 all_unified = cg_all_unified();
1974 return log_error_errno(r, "Couldn't determine whether we are in all unified mode: %m");
1976 log_debug("Unified cgroup hierarchy is located at %s.", path);
1978 r = cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER);
1980 return log_error_errno(r, "Failed to determine whether systemd's own controller is in unified mode: %m");
1982 log_debug("Unified cgroup hierarchy is located at %s. Controllers are on legacy hierarchies.", path);
1984 log_debug("Using cgroup controller " SYSTEMD_CGROUP_CONTROLLER_LEGACY ". File system hierarchy is at %s.", path);
1987 #if 0 /// elogind is not init, and does not install the agent here.
1988 /* 3. Allocate cgroup empty defer event source */
1989 m->cgroup_empty_event_source = sd_event_source_unref(m->cgroup_empty_event_source);
1990 r = sd_event_add_defer(m->event, &m->cgroup_empty_event_source, on_cgroup_empty_event, m);
1992 return log_error_errno(r, "Failed to create cgroup empty event source: %m");
1994 r = sd_event_source_set_priority(m->cgroup_empty_event_source, SD_EVENT_PRIORITY_NORMAL-5);
1996 return log_error_errno(r, "Failed to set priority of cgroup empty event source: %m");
1998 r = sd_event_source_set_enabled(m->cgroup_empty_event_source, SD_EVENT_OFF);
2000 return log_error_errno(r, "Failed to disable cgroup empty event source: %m");
2002 (void) sd_event_source_set_description(m->cgroup_empty_event_source, "cgroup-empty");
2004 /* 4. Install notifier inotify object, or agent */
2005 if (cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER) > 0) {
2007 /* In the unified hierarchy we can get cgroup empty notifications via inotify. */
2009 m->cgroup_inotify_event_source = sd_event_source_unref(m->cgroup_inotify_event_source);
2010 safe_close(m->cgroup_inotify_fd);
2012 m->cgroup_inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC);
2013 if (m->cgroup_inotify_fd < 0)
2014 return log_error_errno(errno, "Failed to create control group inotify object: %m");
2016 r = sd_event_add_io(m->event, &m->cgroup_inotify_event_source, m->cgroup_inotify_fd, EPOLLIN, on_cgroup_inotify_event, m);
2018 return log_error_errno(r, "Failed to watch control group inotify object: %m");
2020 /* Process cgroup empty notifications early, but after service notifications and SIGCHLD. Also
2021 * see handling of cgroup agent notifications, for the classic cgroup hierarchy support. */
2022 r = sd_event_source_set_priority(m->cgroup_inotify_event_source, SD_EVENT_PRIORITY_NORMAL-4);
2024 return log_error_errno(r, "Failed to set priority of inotify event source: %m");
2026 (void) sd_event_source_set_description(m->cgroup_inotify_event_source, "cgroup-inotify");
2028 } else if (MANAGER_IS_SYSTEM(m) && m->test_run_flags == 0) {
2030 /* On the legacy hierarchy we only get notifications via cgroup agents. (Which isn't really reliable,
2031 * since it does not generate events when control groups with children run empty. */
2033 r = cg_install_release_agent(SYSTEMD_CGROUP_CONTROLLER, SYSTEMD_CGROUP_AGENT_PATH);
2035 log_warning_errno(r, "Failed to install release agent, ignoring: %m");
2037 log_debug("Installed release agent.");
2039 log_debug("Release agent already installed.");
2042 /* 5. Make sure we are in the special "init.scope" unit in the root slice. */
2043 scope_path = strjoina(m->cgroup_root, "/" SPECIAL_INIT_SCOPE);
2044 r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, scope_path, 0);
2047 * This method is in core, and normally called by systemd
2048 * being init. As elogind is never init, we can not install
2049 * our agent here. We do so when mounting our cgroup file
2050 * system, so only if elogind is its own tiny controller.
2051 * Further, elogind is not meant to run in systemd init scope. */
2052 if (MANAGER_IS_SYSTEM(m))
2053 // we are our own cgroup controller
2054 scope_path = strjoina("");
2055 else if (streq(m->cgroup_root, "/elogind"))
2056 // root already is our cgroup
2057 scope_path = strjoina(m->cgroup_root);
2059 // we have to create our own group
2060 scope_path = strjoina(m->cgroup_root, "/elogind");
2061 r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, scope_path, 0);
2064 return log_error_errno(r, "Failed to create %s control group: %m", scope_path);
2065 log_debug_elogind("Created control group \"%s\"", scope_path);
2067 #if 0 /// elogind is not a "sub-controller" like systemd, so migration is not needed.
2068 /* Also, move all other userspace processes remaining in the root cgroup into that scope. */
2069 r = cg_migrate(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, SYSTEMD_CGROUP_CONTROLLER, scope_path, 0);
2071 log_warning_errno(r, "Couldn't move remaining userspace processes, ignoring: %m");
2074 /* 6. And pin it, so that it cannot be unmounted */
2075 safe_close(m->pin_cgroupfs_fd);
2076 m->pin_cgroupfs_fd = open(path, O_RDONLY|O_CLOEXEC|O_DIRECTORY|O_NOCTTY|O_NONBLOCK);
2077 if (m->pin_cgroupfs_fd < 0)
2078 return log_error_errno(errno, "Failed to open pin file: %m");
2080 /* 7. Always enable hierarchical support if it exists... */
2081 if (!all_unified && m->test_run_flags == 0)
2082 (void) cg_set_attribute("memory", "/", "memory.use_hierarchy", "1");
2084 /* 8. Figure out which controllers are supported, and log about it */
2085 r = cg_mask_supported(&m->cgroup_supported);
2087 return log_error_errno(r, "Failed to determine supported controllers: %m");
2088 for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++)
2089 log_debug("Controller '%s' supported: %s", cgroup_controller_to_string(c), yes_no(m->cgroup_supported & CGROUP_CONTROLLER_TO_MASK(c)));
2094 void manager_shutdown_cgroup(Manager *m, bool delete) {
2097 /* We can't really delete the group, since we are in it. But
2099 if (delete && m->cgroup_root)
2100 (void) cg_trim(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, false);
2102 #if 0 /// elogind does not support the unified hierarchy, yet.
2103 m->cgroup_empty_event_source = sd_event_source_unref(m->cgroup_empty_event_source);
2105 m->cgroup_inotify_wd_unit = hashmap_free(m->cgroup_inotify_wd_unit);
2107 m->cgroup_inotify_event_source = sd_event_source_unref(m->cgroup_inotify_event_source);
2108 m->cgroup_inotify_fd = safe_close(m->cgroup_inotify_fd);
2111 m->pin_cgroupfs_fd = safe_close(m->pin_cgroupfs_fd);
2113 m->cgroup_root = mfree(m->cgroup_root);
2116 #if 0 /// UNNEEDED by elogind
2117 Unit* manager_get_unit_by_cgroup(Manager *m, const char *cgroup) {
2124 u = hashmap_get(m->cgroup_unit, cgroup);
2128 p = strdupa(cgroup);
2132 e = strrchr(p, '/');
2134 return hashmap_get(m->cgroup_unit, SPECIAL_ROOT_SLICE);
2138 u = hashmap_get(m->cgroup_unit, p);
2144 Unit *manager_get_unit_by_pid_cgroup(Manager *m, pid_t pid) {
2145 _cleanup_free_ char *cgroup = NULL;
2153 r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, pid, &cgroup);
2157 return manager_get_unit_by_cgroup(m, cgroup);
2160 Unit *manager_get_unit_by_pid(Manager *m, pid_t pid) {
2169 return hashmap_get(m->units, SPECIAL_INIT_SCOPE);
2171 u = hashmap_get(m->watch_pids1, PID_TO_PTR(pid));
2175 u = hashmap_get(m->watch_pids2, PID_TO_PTR(pid));
2179 return manager_get_unit_by_pid_cgroup(m, pid);
2183 #if 0 /// elogind must substitute this with its own variant
2184 int manager_notify_cgroup_empty(Manager *m, const char *cgroup) {
2190 /* Called on the legacy hierarchy whenever we get an explicit cgroup notification from the cgroup agent process
2191 * or from the --system instance */
2193 log_debug("Got cgroup empty notification for: %s", cgroup);
2195 u = manager_get_unit_by_cgroup(m, cgroup);
2199 unit_add_to_cgroup_empty_queue(u);
2203 int manager_notify_cgroup_empty(Manager *m, const char *cgroup) {
2209 log_debug("Got cgroup empty notification for: %s", cgroup);
2211 s = hashmap_get(m->sessions, cgroup);
2214 session_finalize(s);
2217 log_warning("Session not found: %s", cgroup);
2222 #if 0 /// UNNEEDED by elogind
2223 int unit_get_memory_current(Unit *u, uint64_t *ret) {
2224 _cleanup_free_ char *v = NULL;
2230 if (!UNIT_CGROUP_BOOL(u, memory_accounting))
2233 if (!u->cgroup_path)
2236 if ((u->cgroup_realized_mask & CGROUP_MASK_MEMORY) == 0)
2239 r = cg_all_unified();
2243 r = cg_get_attribute("memory", u->cgroup_path, "memory.current", &v);
2245 r = cg_get_attribute("memory", u->cgroup_path, "memory.usage_in_bytes", &v);
2251 return safe_atou64(v, ret);
2254 int unit_get_tasks_current(Unit *u, uint64_t *ret) {
2255 _cleanup_free_ char *v = NULL;
2261 if (!UNIT_CGROUP_BOOL(u, tasks_accounting))
2264 if (!u->cgroup_path)
2267 if ((u->cgroup_realized_mask & CGROUP_MASK_PIDS) == 0)
2270 r = cg_get_attribute("pids", u->cgroup_path, "pids.current", &v);
2276 return safe_atou64(v, ret);
2279 static int unit_get_cpu_usage_raw(Unit *u, nsec_t *ret) {
2280 _cleanup_free_ char *v = NULL;
2287 if (!u->cgroup_path)
2290 r = cg_all_unified();
2294 const char *keys[] = { "usage_usec", NULL };
2295 _cleanup_free_ char *val = NULL;
2298 if ((u->cgroup_realized_mask & CGROUP_MASK_CPU) == 0)
2301 r = cg_get_keyed_attribute("cpu", u->cgroup_path, "cpu.stat", keys, &val);
2305 r = safe_atou64(val, &us);
2309 ns = us * NSEC_PER_USEC;
2311 if ((u->cgroup_realized_mask & CGROUP_MASK_CPUACCT) == 0)
2314 r = cg_get_attribute("cpuacct", u->cgroup_path, "cpuacct.usage", &v);
2320 r = safe_atou64(v, &ns);
2329 int unit_get_cpu_usage(Unit *u, nsec_t *ret) {
2335 /* Retrieve the current CPU usage counter. This will subtract the CPU counter taken when the unit was
2336 * started. If the cgroup has been removed already, returns the last cached value. To cache the value, simply
2337 * call this function with a NULL return value. */
2339 if (!UNIT_CGROUP_BOOL(u, cpu_accounting))
2342 r = unit_get_cpu_usage_raw(u, &ns);
2343 if (r == -ENODATA && u->cpu_usage_last != NSEC_INFINITY) {
2344 /* If we can't get the CPU usage anymore (because the cgroup was already removed, for example), use our
2348 *ret = u->cpu_usage_last;
2354 if (ns > u->cpu_usage_base)
2355 ns -= u->cpu_usage_base;
2359 u->cpu_usage_last = ns;
2366 int unit_get_ip_accounting(
2368 CGroupIPAccountingMetric metric,
2375 assert(metric >= 0);
2376 assert(metric < _CGROUP_IP_ACCOUNTING_METRIC_MAX);
2379 /* IP accounting is currently not recursive, and hence we refuse to return any data for slice nodes. Slices are
2380 * inner cgroup nodes and hence have no processes directly attached, hence their counters would be zero
2381 * anyway. And if we block this now we can later open this up, if the kernel learns recursive BPF cgroup
2383 if (u->type == UNIT_SLICE)
2386 if (!UNIT_CGROUP_BOOL(u, ip_accounting))
2389 fd = IN_SET(metric, CGROUP_IP_INGRESS_BYTES, CGROUP_IP_INGRESS_PACKETS) ?
2390 u->ip_accounting_ingress_map_fd :
2391 u->ip_accounting_egress_map_fd;
2396 if (IN_SET(metric, CGROUP_IP_INGRESS_BYTES, CGROUP_IP_EGRESS_BYTES))
2397 r = bpf_firewall_read_accounting(fd, &value, NULL);
2399 r = bpf_firewall_read_accounting(fd, NULL, &value);
2403 /* Add in additional metrics from a previous runtime. Note that when reexecing/reloading the daemon we compile
2404 * all BPF programs and maps anew, but serialize the old counters. When deserializing we store them in the
2405 * ip_accounting_extra[] field, and add them in here transparently. */
2407 *ret = value + u->ip_accounting_extra[metric];
2412 int unit_reset_cpu_accounting(Unit *u) {
2418 u->cpu_usage_last = NSEC_INFINITY;
2420 r = unit_get_cpu_usage_raw(u, &ns);
2422 u->cpu_usage_base = 0;
2426 u->cpu_usage_base = ns;
2430 int unit_reset_ip_accounting(Unit *u) {
2435 if (u->ip_accounting_ingress_map_fd >= 0)
2436 r = bpf_firewall_reset_accounting(u->ip_accounting_ingress_map_fd);
2438 if (u->ip_accounting_egress_map_fd >= 0)
2439 q = bpf_firewall_reset_accounting(u->ip_accounting_egress_map_fd);
2441 zero(u->ip_accounting_extra);
2443 return r < 0 ? r : q;
2446 void unit_invalidate_cgroup(Unit *u, CGroupMask m) {
2449 if (!UNIT_HAS_CGROUP_CONTEXT(u))
2455 /* always invalidate compat pairs together */
2456 if (m & (CGROUP_MASK_IO | CGROUP_MASK_BLKIO))
2457 m |= CGROUP_MASK_IO | CGROUP_MASK_BLKIO;
2459 if (m & (CGROUP_MASK_CPU | CGROUP_MASK_CPUACCT))
2460 m |= CGROUP_MASK_CPU | CGROUP_MASK_CPUACCT;
2462 if ((u->cgroup_realized_mask & m) == 0)
2465 u->cgroup_realized_mask &= ~m;
2466 unit_add_to_cgroup_realize_queue(u);
2469 void unit_invalidate_cgroup_bpf(Unit *u) {
2472 if (!UNIT_HAS_CGROUP_CONTEXT(u))
2475 if (u->cgroup_bpf_state == UNIT_CGROUP_BPF_INVALIDATED)
2478 u->cgroup_bpf_state = UNIT_CGROUP_BPF_INVALIDATED;
2479 unit_add_to_cgroup_realize_queue(u);
2481 /* If we are a slice unit, we also need to put compile a new BPF program for all our children, as the IP access
2482 * list of our children includes our own. */
2483 if (u->type == UNIT_SLICE) {
2487 SET_FOREACH(member, u->dependencies[UNIT_BEFORE], i) {
2491 if (UNIT_DEREF(member->slice) != u)
2494 unit_invalidate_cgroup_bpf(member);
2499 void manager_invalidate_startup_units(Manager *m) {
2505 SET_FOREACH(u, m->startup_units, i)
2506 unit_invalidate_cgroup(u, CGROUP_MASK_CPU|CGROUP_MASK_IO|CGROUP_MASK_BLKIO);
2509 static const char* const cgroup_device_policy_table[_CGROUP_DEVICE_POLICY_MAX] = {
2510 [CGROUP_AUTO] = "auto",
2511 [CGROUP_CLOSED] = "closed",
2512 [CGROUP_STRICT] = "strict",
2515 DEFINE_STRING_TABLE_LOOKUP(cgroup_device_policy, CGroupDevicePolicy);