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 "string-table.h"
34 #include "string-util.h"
35 #include "stdio-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_shares = CGROUP_CPU_SHARES_INVALID;
62 c->startup_cpu_shares = CGROUP_CPU_SHARES_INVALID;
63 c->cpu_quota_per_sec_usec = USEC_INFINITY;
65 c->memory_high = CGROUP_LIMIT_MAX;
66 c->memory_max = CGROUP_LIMIT_MAX;
68 c->memory_limit = CGROUP_LIMIT_MAX;
70 c->io_weight = CGROUP_WEIGHT_INVALID;
71 c->startup_io_weight = CGROUP_WEIGHT_INVALID;
73 c->blockio_weight = CGROUP_BLKIO_WEIGHT_INVALID;
74 c->startup_blockio_weight = CGROUP_BLKIO_WEIGHT_INVALID;
76 c->tasks_max = (uint64_t) -1;
79 void cgroup_context_free_device_allow(CGroupContext *c, CGroupDeviceAllow *a) {
83 LIST_REMOVE(device_allow, c->device_allow, a);
88 void cgroup_context_free_io_device_weight(CGroupContext *c, CGroupIODeviceWeight *w) {
92 LIST_REMOVE(device_weights, c->io_device_weights, w);
97 void cgroup_context_free_io_device_limit(CGroupContext *c, CGroupIODeviceLimit *l) {
101 LIST_REMOVE(device_limits, c->io_device_limits, l);
106 void cgroup_context_free_blockio_device_weight(CGroupContext *c, CGroupBlockIODeviceWeight *w) {
110 LIST_REMOVE(device_weights, c->blockio_device_weights, w);
115 void cgroup_context_free_blockio_device_bandwidth(CGroupContext *c, CGroupBlockIODeviceBandwidth *b) {
119 LIST_REMOVE(device_bandwidths, c->blockio_device_bandwidths, b);
124 void cgroup_context_done(CGroupContext *c) {
127 while (c->io_device_weights)
128 cgroup_context_free_io_device_weight(c, c->io_device_weights);
130 while (c->io_device_limits)
131 cgroup_context_free_io_device_limit(c, c->io_device_limits);
133 while (c->blockio_device_weights)
134 cgroup_context_free_blockio_device_weight(c, c->blockio_device_weights);
136 while (c->blockio_device_bandwidths)
137 cgroup_context_free_blockio_device_bandwidth(c, c->blockio_device_bandwidths);
139 while (c->device_allow)
140 cgroup_context_free_device_allow(c, c->device_allow);
143 void cgroup_context_dump(CGroupContext *c, FILE* f, const char *prefix) {
144 CGroupIODeviceLimit *il;
145 CGroupIODeviceWeight *iw;
146 CGroupBlockIODeviceBandwidth *b;
147 CGroupBlockIODeviceWeight *w;
148 CGroupDeviceAllow *a;
149 char u[FORMAT_TIMESPAN_MAX];
154 prefix = strempty(prefix);
157 "%sCPUAccounting=%s\n"
158 "%sIOAccounting=%s\n"
159 "%sBlockIOAccounting=%s\n"
160 "%sMemoryAccounting=%s\n"
161 "%sTasksAccounting=%s\n"
162 "%sCPUShares=%" PRIu64 "\n"
163 "%sStartupCPUShares=%" PRIu64 "\n"
164 "%sCPUQuotaPerSecSec=%s\n"
165 "%sIOWeight=%" PRIu64 "\n"
166 "%sStartupIOWeight=%" PRIu64 "\n"
167 "%sBlockIOWeight=%" PRIu64 "\n"
168 "%sStartupBlockIOWeight=%" PRIu64 "\n"
169 "%sMemoryLow=%" PRIu64 "\n"
170 "%sMemoryHigh=%" PRIu64 "\n"
171 "%sMemoryMax=%" PRIu64 "\n"
172 "%sMemoryLimit=%" PRIu64 "\n"
173 "%sTasksMax=%" PRIu64 "\n"
174 "%sDevicePolicy=%s\n"
176 prefix, yes_no(c->cpu_accounting),
177 prefix, yes_no(c->io_accounting),
178 prefix, yes_no(c->blockio_accounting),
179 prefix, yes_no(c->memory_accounting),
180 prefix, yes_no(c->tasks_accounting),
181 prefix, c->cpu_shares,
182 prefix, c->startup_cpu_shares,
183 prefix, format_timespan(u, sizeof(u), c->cpu_quota_per_sec_usec, 1),
184 prefix, c->io_weight,
185 prefix, c->startup_io_weight,
186 prefix, c->blockio_weight,
187 prefix, c->startup_blockio_weight,
188 prefix, c->memory_low,
189 prefix, c->memory_high,
190 prefix, c->memory_max,
191 prefix, c->memory_limit,
192 prefix, c->tasks_max,
193 prefix, cgroup_device_policy_to_string(c->device_policy),
194 prefix, yes_no(c->delegate));
196 LIST_FOREACH(device_allow, a, c->device_allow)
198 "%sDeviceAllow=%s %s%s%s\n",
201 a->r ? "r" : "", a->w ? "w" : "", a->m ? "m" : "");
203 LIST_FOREACH(device_weights, iw, c->io_device_weights)
205 "%sIODeviceWeight=%s %" PRIu64,
210 LIST_FOREACH(device_limits, il, c->io_device_limits) {
211 char buf[FORMAT_BYTES_MAX];
212 CGroupIOLimitType type;
214 for (type = 0; type < _CGROUP_IO_LIMIT_TYPE_MAX; type++)
215 if (il->limits[type] != cgroup_io_limit_defaults[type])
219 cgroup_io_limit_type_to_string(type),
221 format_bytes(buf, sizeof(buf), il->limits[type]));
224 LIST_FOREACH(device_weights, w, c->blockio_device_weights)
226 "%sBlockIODeviceWeight=%s %" PRIu64,
231 LIST_FOREACH(device_bandwidths, b, c->blockio_device_bandwidths) {
232 char buf[FORMAT_BYTES_MAX];
234 if (b->rbps != CGROUP_LIMIT_MAX)
236 "%sBlockIOReadBandwidth=%s %s\n",
239 format_bytes(buf, sizeof(buf), b->rbps));
240 if (b->wbps != CGROUP_LIMIT_MAX)
242 "%sBlockIOWriteBandwidth=%s %s\n",
245 format_bytes(buf, sizeof(buf), b->wbps));
249 static int lookup_block_device(const char *p, dev_t *dev) {
258 return log_warning_errno(errno, "Couldn't stat device %s: %m", p);
260 if (S_ISBLK(st.st_mode))
262 else if (major(st.st_dev) != 0) {
263 /* If this is not a device node then find the block
264 * device this file is stored on */
267 /* If this is a partition, try to get the originating
269 block_get_whole_disk(*dev, dev);
271 log_warning("%s is not a block device and file system block device cannot be determined or is not local.", p);
278 static int whitelist_device(const char *path, const char *node, const char *acc) {
279 char buf[2+DECIMAL_STR_MAX(dev_t)*2+2+4];
286 if (stat(node, &st) < 0) {
287 log_warning("Couldn't stat device %s", node);
291 if (!S_ISCHR(st.st_mode) && !S_ISBLK(st.st_mode)) {
292 log_warning("%s is not a device.", node);
298 S_ISCHR(st.st_mode) ? 'c' : 'b',
299 major(st.st_rdev), minor(st.st_rdev),
302 r = cg_set_attribute("devices", path, "devices.allow", buf);
304 log_full_errno(IN_SET(r, -ENOENT, -EROFS, -EINVAL, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
305 "Failed to set devices.allow on %s: %m", path);
310 static int whitelist_major(const char *path, const char *name, char type, const char *acc) {
311 _cleanup_fclose_ FILE *f = NULL;
318 assert(type == 'b' || type == 'c');
320 f = fopen("/proc/devices", "re");
322 return log_warning_errno(errno, "Cannot open /proc/devices to resolve %s (%c): %m", name, type);
324 FOREACH_LINE(line, f, goto fail) {
325 char buf[2+DECIMAL_STR_MAX(unsigned)+3+4], *p, *w;
330 if (type == 'c' && streq(line, "Character devices:")) {
335 if (type == 'b' && streq(line, "Block devices:")) {
350 w = strpbrk(p, WHITESPACE);
355 r = safe_atou(p, &maj);
362 w += strspn(w, WHITESPACE);
364 if (fnmatch(name, w, 0) != 0)
373 r = cg_set_attribute("devices", path, "devices.allow", buf);
375 log_full_errno(IN_SET(r, -ENOENT, -EROFS, -EINVAL, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
376 "Failed to set devices.allow on %s: %m", path);
382 log_warning_errno(errno, "Failed to read /proc/devices: %m");
386 static bool cgroup_context_has_io_config(CGroupContext *c) {
387 return c->io_accounting ||
388 c->io_weight != CGROUP_WEIGHT_INVALID ||
389 c->startup_io_weight != CGROUP_WEIGHT_INVALID ||
390 c->io_device_weights ||
394 static bool cgroup_context_has_blockio_config(CGroupContext *c) {
395 return c->blockio_accounting ||
396 c->blockio_weight != CGROUP_BLKIO_WEIGHT_INVALID ||
397 c->startup_blockio_weight != CGROUP_BLKIO_WEIGHT_INVALID ||
398 c->blockio_device_weights ||
399 c->blockio_device_bandwidths;
402 static uint64_t cgroup_context_io_weight(CGroupContext *c, ManagerState state) {
403 if (IN_SET(state, MANAGER_STARTING, MANAGER_INITIALIZING) &&
404 c->startup_io_weight != CGROUP_WEIGHT_INVALID)
405 return c->startup_io_weight;
406 else if (c->io_weight != CGROUP_WEIGHT_INVALID)
409 return CGROUP_WEIGHT_DEFAULT;
412 static uint64_t cgroup_context_blkio_weight(CGroupContext *c, ManagerState state) {
413 if (IN_SET(state, MANAGER_STARTING, MANAGER_INITIALIZING) &&
414 c->startup_blockio_weight != CGROUP_BLKIO_WEIGHT_INVALID)
415 return c->startup_blockio_weight;
416 else if (c->blockio_weight != CGROUP_BLKIO_WEIGHT_INVALID)
417 return c->blockio_weight;
419 return CGROUP_BLKIO_WEIGHT_DEFAULT;
422 static uint64_t cgroup_weight_blkio_to_io(uint64_t blkio_weight) {
423 return CLAMP(blkio_weight * CGROUP_WEIGHT_DEFAULT / CGROUP_BLKIO_WEIGHT_DEFAULT,
424 CGROUP_WEIGHT_MIN, CGROUP_WEIGHT_MAX);
427 static uint64_t cgroup_weight_io_to_blkio(uint64_t io_weight) {
428 return CLAMP(io_weight * CGROUP_BLKIO_WEIGHT_DEFAULT / CGROUP_WEIGHT_DEFAULT,
429 CGROUP_BLKIO_WEIGHT_MIN, CGROUP_BLKIO_WEIGHT_MAX);
432 static void cgroup_apply_io_device_weight(Unit *u, const char *dev_path, uint64_t io_weight) {
433 char buf[DECIMAL_STR_MAX(dev_t)*2+2+DECIMAL_STR_MAX(uint64_t)+1];
437 r = lookup_block_device(dev_path, &dev);
441 xsprintf(buf, "%u:%u %" PRIu64 "\n", major(dev), minor(dev), io_weight);
442 r = cg_set_attribute("io", u->cgroup_path, "io.weight", buf);
444 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
445 "Failed to set io.weight: %m");
448 static void cgroup_apply_blkio_device_weight(Unit *u, const char *dev_path, uint64_t blkio_weight) {
449 char buf[DECIMAL_STR_MAX(dev_t)*2+2+DECIMAL_STR_MAX(uint64_t)+1];
453 r = lookup_block_device(dev_path, &dev);
457 xsprintf(buf, "%u:%u %" PRIu64 "\n", major(dev), minor(dev), blkio_weight);
458 r = cg_set_attribute("blkio", u->cgroup_path, "blkio.weight_device", buf);
460 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
461 "Failed to set blkio.weight_device: %m");
464 static unsigned cgroup_apply_io_device_limit(Unit *u, const char *dev_path, uint64_t *limits) {
465 char limit_bufs[_CGROUP_IO_LIMIT_TYPE_MAX][DECIMAL_STR_MAX(uint64_t)];
466 char buf[DECIMAL_STR_MAX(dev_t)*2+2+(6+DECIMAL_STR_MAX(uint64_t)+1)*4];
467 CGroupIOLimitType type;
472 r = lookup_block_device(dev_path, &dev);
476 for (type = 0; type < _CGROUP_IO_LIMIT_TYPE_MAX; type++) {
477 if (limits[type] != cgroup_io_limit_defaults[type]) {
478 xsprintf(limit_bufs[type], "%" PRIu64, limits[type]);
481 xsprintf(limit_bufs[type], "%s", limits[type] == CGROUP_LIMIT_MAX ? "max" : "0");
485 xsprintf(buf, "%u:%u rbps=%s wbps=%s riops=%s wiops=%s\n", major(dev), minor(dev),
486 limit_bufs[CGROUP_IO_RBPS_MAX], limit_bufs[CGROUP_IO_WBPS_MAX],
487 limit_bufs[CGROUP_IO_RIOPS_MAX], limit_bufs[CGROUP_IO_WIOPS_MAX]);
488 r = cg_set_attribute("io", u->cgroup_path, "io.max", buf);
490 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
491 "Failed to set io.max: %m");
495 static unsigned cgroup_apply_blkio_device_limit(Unit *u, const char *dev_path, uint64_t rbps, uint64_t wbps) {
496 char buf[DECIMAL_STR_MAX(dev_t)*2+2+DECIMAL_STR_MAX(uint64_t)+1];
501 r = lookup_block_device(dev_path, &dev);
505 if (rbps != CGROUP_LIMIT_MAX)
507 sprintf(buf, "%u:%u %" PRIu64 "\n", major(dev), minor(dev), rbps);
508 r = cg_set_attribute("blkio", u->cgroup_path, "blkio.throttle.read_bps_device", buf);
510 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
511 "Failed to set blkio.throttle.read_bps_device: %m");
513 if (wbps != CGROUP_LIMIT_MAX)
515 sprintf(buf, "%u:%u %" PRIu64 "\n", major(dev), minor(dev), wbps);
516 r = cg_set_attribute("blkio", u->cgroup_path, "blkio.throttle.write_bps_device", buf);
518 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
519 "Failed to set blkio.throttle.write_bps_device: %m");
524 static bool cgroup_context_has_unified_memory_config(CGroupContext *c) {
525 return c->memory_low > 0 || c->memory_high != CGROUP_LIMIT_MAX || c->memory_max != CGROUP_LIMIT_MAX;
528 static void cgroup_apply_unified_memory_limit(Unit *u, const char *file, uint64_t v) {
529 char buf[DECIMAL_STR_MAX(uint64_t) + 1] = "max";
532 if (v != CGROUP_LIMIT_MAX)
533 xsprintf(buf, "%" PRIu64 "\n", v);
535 r = cg_set_attribute("memory", u->cgroup_path, file, buf);
537 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
538 "Failed to set %s: %m", file);
541 static void cgroup_context_apply(Unit *u, CGroupMask mask, ManagerState state) {
549 c = unit_get_cgroup_context(u);
550 path = u->cgroup_path;
558 /* Some cgroup attributes are not supported on the root cgroup,
559 * hence silently ignore */
560 is_root = isempty(path) || path_equal(path, "/");
562 /* Make sure we don't try to display messages with an empty path. */
565 /* We generally ignore errors caused by read-only mounted
566 * cgroup trees (assuming we are running in a container then),
567 * and missing cgroups, i.e. EROFS and ENOENT. */
569 if ((mask & CGROUP_MASK_CPU) && !is_root) {
570 char buf[MAX(DECIMAL_STR_MAX(uint64_t), DECIMAL_STR_MAX(usec_t)) + 1];
572 sprintf(buf, "%" PRIu64 "\n",
573 IN_SET(state, MANAGER_STARTING, MANAGER_INITIALIZING) && c->startup_cpu_shares != CGROUP_CPU_SHARES_INVALID ? c->startup_cpu_shares :
574 c->cpu_shares != CGROUP_CPU_SHARES_INVALID ? c->cpu_shares : CGROUP_CPU_SHARES_DEFAULT);
575 r = cg_set_attribute("cpu", path, "cpu.shares", buf);
577 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
578 "Failed to set cpu.shares: %m");
580 sprintf(buf, USEC_FMT "\n", CGROUP_CPU_QUOTA_PERIOD_USEC);
581 r = cg_set_attribute("cpu", path, "cpu.cfs_period_us", buf);
583 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
584 "Failed to set cpu.cfs_period_us: %m");
586 if (c->cpu_quota_per_sec_usec != USEC_INFINITY) {
587 sprintf(buf, USEC_FMT "\n", c->cpu_quota_per_sec_usec * CGROUP_CPU_QUOTA_PERIOD_USEC / USEC_PER_SEC);
588 r = cg_set_attribute("cpu", path, "cpu.cfs_quota_us", buf);
590 r = cg_set_attribute("cpu", path, "cpu.cfs_quota_us", "-1");
592 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
593 "Failed to set cpu.cfs_quota_us: %m");
596 if (mask & CGROUP_MASK_IO) {
597 bool has_io = cgroup_context_has_io_config(c);
598 bool has_blockio = cgroup_context_has_blockio_config(c);
601 char buf[8+DECIMAL_STR_MAX(uint64_t)+1];
605 weight = cgroup_context_io_weight(c, state);
606 else if (has_blockio) {
607 uint64_t blkio_weight = cgroup_context_blkio_weight(c, state);
609 weight = cgroup_weight_blkio_to_io(blkio_weight);
611 log_cgroup_compat(u, "Applying [Startup]BlockIOWeight %" PRIu64 " as [Startup]IOWeight %" PRIu64,
612 blkio_weight, weight);
614 weight = CGROUP_WEIGHT_DEFAULT;
616 xsprintf(buf, "default %" PRIu64 "\n", weight);
617 r = cg_set_attribute("io", path, "io.weight", buf);
619 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
620 "Failed to set io.weight: %m");
623 CGroupIODeviceWeight *w;
625 /* FIXME: no way to reset this list */
626 LIST_FOREACH(device_weights, w, c->io_device_weights)
627 cgroup_apply_io_device_weight(u, w->path, w->weight);
628 } else if (has_blockio) {
629 CGroupBlockIODeviceWeight *w;
631 /* FIXME: no way to reset this list */
632 LIST_FOREACH(device_weights, w, c->blockio_device_weights) {
633 weight = cgroup_weight_blkio_to_io(w->weight);
635 log_cgroup_compat(u, "Applying BlockIODeviceWeight %" PRIu64 " as IODeviceWeight %" PRIu64 " for %s",
636 w->weight, weight, w->path);
638 cgroup_apply_io_device_weight(u, w->path, weight);
643 /* Apply limits and free ones without config. */
645 CGroupIODeviceLimit *l, *next;
647 LIST_FOREACH_SAFE(device_limits, l, next, c->io_device_limits) {
648 if (!cgroup_apply_io_device_limit(u, l->path, l->limits))
649 cgroup_context_free_io_device_limit(c, l);
651 } else if (has_blockio) {
652 CGroupBlockIODeviceBandwidth *b, *next;
654 LIST_FOREACH_SAFE(device_bandwidths, b, next, c->blockio_device_bandwidths) {
655 uint64_t limits[_CGROUP_IO_LIMIT_TYPE_MAX];
656 CGroupIOLimitType type;
658 for (type = 0; type < _CGROUP_IO_LIMIT_TYPE_MAX; type++)
659 limits[type] = cgroup_io_limit_defaults[type];
661 limits[CGROUP_IO_RBPS_MAX] = b->rbps;
662 limits[CGROUP_IO_WBPS_MAX] = b->wbps;
664 log_cgroup_compat(u, "Applying BlockIO{Read|Write}Bandwidth %" PRIu64 " %" PRIu64 " as IO{Read|Write}BandwidthMax for %s",
665 b->rbps, b->wbps, b->path);
667 if (!cgroup_apply_io_device_limit(u, b->path, limits))
668 cgroup_context_free_blockio_device_bandwidth(c, b);
673 if (mask & CGROUP_MASK_BLKIO) {
674 bool has_io = cgroup_context_has_io_config(c);
675 bool has_blockio = cgroup_context_has_blockio_config(c);
678 char buf[DECIMAL_STR_MAX(uint64_t)+1];
682 weight = cgroup_context_blkio_weight(c, state);
684 uint64_t io_weight = cgroup_context_io_weight(c, state);
686 weight = cgroup_weight_io_to_blkio(cgroup_context_io_weight(c, state));
688 log_cgroup_compat(u, "Applying [Startup]IOWeight %" PRIu64 " as [Startup]BlockIOWeight %" PRIu64,
691 weight = CGROUP_BLKIO_WEIGHT_DEFAULT;
693 xsprintf(buf, "%" PRIu64 "\n", weight);
694 r = cg_set_attribute("blkio", path, "blkio.weight", buf);
696 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
697 "Failed to set blkio.weight: %m");
700 CGroupBlockIODeviceWeight *w;
702 /* FIXME: no way to reset this list */
703 LIST_FOREACH(device_weights, w, c->blockio_device_weights)
704 cgroup_apply_blkio_device_weight(u, w->path, w->weight);
706 CGroupIODeviceWeight *w;
708 /* FIXME: no way to reset this list */
709 LIST_FOREACH(device_weights, w, c->io_device_weights) {
710 weight = cgroup_weight_io_to_blkio(w->weight);
712 log_cgroup_compat(u, "Applying IODeviceWeight %" PRIu64 " as BlockIODeviceWeight %" PRIu64 " for %s",
713 w->weight, weight, w->path);
715 cgroup_apply_blkio_device_weight(u, w->path, weight);
720 /* Apply limits and free ones without config. */
722 CGroupBlockIODeviceBandwidth *b, *next;
724 LIST_FOREACH_SAFE(device_bandwidths, b, next, c->blockio_device_bandwidths) {
725 if (!cgroup_apply_blkio_device_limit(u, b->path, b->rbps, b->wbps))
726 cgroup_context_free_blockio_device_bandwidth(c, b);
729 CGroupIODeviceLimit *l, *next;
731 LIST_FOREACH_SAFE(device_limits, l, next, c->io_device_limits) {
732 log_cgroup_compat(u, "Applying IO{Read|Write}Bandwidth %" PRIu64 " %" PRIu64 " as BlockIO{Read|Write}BandwidthMax for %s",
733 l->limits[CGROUP_IO_RBPS_MAX], l->limits[CGROUP_IO_WBPS_MAX], l->path);
735 if (!cgroup_apply_blkio_device_limit(u, l->path, l->limits[CGROUP_IO_RBPS_MAX], l->limits[CGROUP_IO_WBPS_MAX]))
736 cgroup_context_free_io_device_limit(c, l);
741 if ((mask & CGROUP_MASK_MEMORY) && !is_root) {
742 if (cg_unified() > 0) {
743 uint64_t max = c->memory_max;
745 if (cgroup_context_has_unified_memory_config(c))
748 max = c->memory_limit;
750 if (max != CGROUP_LIMIT_MAX)
751 log_cgroup_compat(u, "Applying MemoryLimit %" PRIu64 " as MemoryMax", max);
754 cgroup_apply_unified_memory_limit(u, "memory.low", c->memory_low);
755 cgroup_apply_unified_memory_limit(u, "memory.high", c->memory_high);
756 cgroup_apply_unified_memory_limit(u, "memory.max", max);
758 char buf[DECIMAL_STR_MAX(uint64_t) + 1];
759 uint64_t val = c->memory_limit;
761 if (val == CGROUP_LIMIT_MAX) {
764 if (val != CGROUP_LIMIT_MAX)
765 log_cgroup_compat(u, "Applying MemoryMax %" PRIi64 " as MemoryLimit", c->memory_max);
768 if (val == CGROUP_LIMIT_MAX)
769 strncpy(buf, "-1\n", sizeof(buf));
771 xsprintf(buf, "%" PRIu64 "\n", val);
773 r = cg_set_attribute("memory", path, "memory.limit_in_bytes", buf);
775 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
776 "Failed to set memory.limit_in_bytes: %m");
780 if ((mask & CGROUP_MASK_DEVICES) && !is_root) {
781 CGroupDeviceAllow *a;
783 /* Changing the devices list of a populated cgroup
784 * might result in EINVAL, hence ignore EINVAL
787 if (c->device_allow || c->device_policy != CGROUP_AUTO)
788 r = cg_set_attribute("devices", path, "devices.deny", "a");
790 r = cg_set_attribute("devices", path, "devices.allow", "a");
792 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EINVAL, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
793 "Failed to reset devices.list: %m");
795 if (c->device_policy == CGROUP_CLOSED ||
796 (c->device_policy == CGROUP_AUTO && c->device_allow)) {
797 static const char auto_devices[] =
798 "/dev/null\0" "rwm\0"
799 "/dev/zero\0" "rwm\0"
800 "/dev/full\0" "rwm\0"
801 "/dev/random\0" "rwm\0"
802 "/dev/urandom\0" "rwm\0"
804 "/dev/pts/ptmx\0" "rw\0" /* /dev/pts/ptmx may not be duplicated, but accessed */
805 /* Allow /run/elogind/inaccessible/{chr,blk} devices for mapping InaccessiblePaths */
806 /* Allow /run/systemd/inaccessible/{chr,blk} devices for mapping InaccessiblePaths */
807 "/run/systemd/inaccessible/chr\0" "rwm\0"
808 "/run/systemd/inaccessible/blk\0" "rwm\0";
812 NULSTR_FOREACH_PAIR(x, y, auto_devices)
813 whitelist_device(path, x, y);
815 whitelist_major(path, "pts", 'c', "rw");
816 whitelist_major(path, "kdbus", 'c', "rw");
817 whitelist_major(path, "kdbus/*", 'c', "rw");
820 LIST_FOREACH(device_allow, a, c->device_allow) {
836 if (startswith(a->path, "/dev/"))
837 whitelist_device(path, a->path, acc);
838 else if (startswith(a->path, "block-"))
839 whitelist_major(path, a->path + 6, 'b', acc);
840 else if (startswith(a->path, "char-"))
841 whitelist_major(path, a->path + 5, 'c', acc);
843 log_unit_debug(u, "Ignoring device %s while writing cgroup attribute.", a->path);
847 if ((mask & CGROUP_MASK_PIDS) && !is_root) {
849 if (c->tasks_max != (uint64_t) -1) {
850 char buf[DECIMAL_STR_MAX(uint64_t) + 2];
852 sprintf(buf, "%" PRIu64 "\n", c->tasks_max);
853 r = cg_set_attribute("pids", path, "pids.max", buf);
855 r = cg_set_attribute("pids", path, "pids.max", "max");
858 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
859 "Failed to set pids.max: %m");
863 CGroupMask cgroup_context_get_mask(CGroupContext *c) {
866 /* Figure out which controllers we need */
868 if (c->cpu_accounting ||
869 c->cpu_shares != CGROUP_CPU_SHARES_INVALID ||
870 c->startup_cpu_shares != CGROUP_CPU_SHARES_INVALID ||
871 c->cpu_quota_per_sec_usec != USEC_INFINITY)
872 mask |= CGROUP_MASK_CPUACCT | CGROUP_MASK_CPU;
874 if (cgroup_context_has_io_config(c) || cgroup_context_has_blockio_config(c))
875 mask |= CGROUP_MASK_IO | CGROUP_MASK_BLKIO;
877 if (c->memory_accounting ||
878 c->memory_limit != CGROUP_LIMIT_MAX ||
879 cgroup_context_has_unified_memory_config(c))
880 mask |= CGROUP_MASK_MEMORY;
882 if (c->device_allow ||
883 c->device_policy != CGROUP_AUTO)
884 mask |= CGROUP_MASK_DEVICES;
886 if (c->tasks_accounting ||
887 c->tasks_max != (uint64_t) -1)
888 mask |= CGROUP_MASK_PIDS;
893 CGroupMask unit_get_own_mask(Unit *u) {
896 /* Returns the mask of controllers the unit needs for itself */
898 c = unit_get_cgroup_context(u);
902 /* If delegation is turned on, then turn on all cgroups,
903 * unless we are on the legacy hierarchy and the process we
904 * fork into it is known to drop privileges, and hence
905 * shouldn't get access to the controllers.
907 * Note that on the unified hierarchy it is safe to delegate
908 * controllers to unprivileged services. */
913 e = unit_get_exec_context(u);
915 exec_context_maintains_privileges(e) ||
917 return _CGROUP_MASK_ALL;
920 return cgroup_context_get_mask(c);
923 CGroupMask unit_get_members_mask(Unit *u) {
926 /* Returns the mask of controllers all of the unit's children
929 if (u->cgroup_members_mask_valid)
930 return u->cgroup_members_mask;
932 u->cgroup_members_mask = 0;
934 if (u->type == UNIT_SLICE) {
938 SET_FOREACH(member, u->dependencies[UNIT_BEFORE], i) {
943 if (UNIT_DEREF(member->slice) != u)
946 u->cgroup_members_mask |=
947 unit_get_own_mask(member) |
948 unit_get_members_mask(member);
952 u->cgroup_members_mask_valid = true;
953 return u->cgroup_members_mask;
956 CGroupMask unit_get_siblings_mask(Unit *u) {
959 /* Returns the mask of controllers all of the unit's siblings
960 * require, i.e. the members mask of the unit's parent slice
961 * if there is one. */
963 if (UNIT_ISSET(u->slice))
964 return unit_get_members_mask(UNIT_DEREF(u->slice));
966 return unit_get_own_mask(u) | unit_get_members_mask(u);
969 CGroupMask unit_get_subtree_mask(Unit *u) {
971 /* Returns the mask of this subtree, meaning of the group
972 * itself and its children. */
974 return unit_get_own_mask(u) | unit_get_members_mask(u);
977 CGroupMask unit_get_target_mask(Unit *u) {
980 /* This returns the cgroup mask of all controllers to enable
981 * for a specific cgroup, i.e. everything it needs itself,
982 * plus all that its children need, plus all that its siblings
983 * need. This is primarily useful on the legacy cgroup
984 * hierarchy, where we need to duplicate each cgroup in each
985 * hierarchy that shall be enabled for it. */
987 mask = unit_get_own_mask(u) | unit_get_members_mask(u) | unit_get_siblings_mask(u);
988 mask &= u->manager->cgroup_supported;
993 CGroupMask unit_get_enable_mask(Unit *u) {
996 /* This returns the cgroup mask of all controllers to enable
997 * for the children of a specific cgroup. This is primarily
998 * useful for the unified cgroup hierarchy, where each cgroup
999 * controls which controllers are enabled for its children. */
1001 mask = unit_get_members_mask(u);
1002 mask &= u->manager->cgroup_supported;
1007 /* Recurse from a unit up through its containing slices, propagating
1008 * mask bits upward. A unit is also member of itself. */
1009 void unit_update_cgroup_members_masks(Unit *u) {
1015 /* Calculate subtree mask */
1016 m = unit_get_subtree_mask(u);
1018 /* See if anything changed from the previous invocation. If
1019 * not, we're done. */
1020 if (u->cgroup_subtree_mask_valid && m == u->cgroup_subtree_mask)
1024 u->cgroup_subtree_mask_valid &&
1025 ((m & ~u->cgroup_subtree_mask) != 0) &&
1026 ((~m & u->cgroup_subtree_mask) == 0);
1028 u->cgroup_subtree_mask = m;
1029 u->cgroup_subtree_mask_valid = true;
1031 if (UNIT_ISSET(u->slice)) {
1032 Unit *s = UNIT_DEREF(u->slice);
1035 /* There's more set now than before. We
1036 * propagate the new mask to the parent's mask
1037 * (not caring if it actually was valid or
1040 s->cgroup_members_mask |= m;
1043 /* There's less set now than before (or we
1044 * don't know), we need to recalculate
1045 * everything, so let's invalidate the
1046 * parent's members mask */
1048 s->cgroup_members_mask_valid = false;
1050 /* And now make sure that this change also hits our
1052 unit_update_cgroup_members_masks(s);
1056 static const char *migrate_callback(CGroupMask mask, void *userdata) {
1063 if (u->cgroup_path &&
1064 u->cgroup_realized &&
1065 (u->cgroup_realized_mask & mask) == mask)
1066 return u->cgroup_path;
1068 u = UNIT_DEREF(u->slice);
1074 char *unit_default_cgroup_path(Unit *u) {
1075 _cleanup_free_ char *escaped = NULL, *slice = NULL;
1080 if (unit_has_name(u, SPECIAL_ROOT_SLICE))
1081 return strdup(u->manager->cgroup_root);
1083 if (UNIT_ISSET(u->slice) && !unit_has_name(UNIT_DEREF(u->slice), SPECIAL_ROOT_SLICE)) {
1084 r = cg_slice_to_path(UNIT_DEREF(u->slice)->id, &slice);
1089 escaped = cg_escape(u->id);
1094 return strjoin(u->manager->cgroup_root, "/", slice, "/", escaped, NULL);
1096 return strjoin(u->manager->cgroup_root, "/", escaped, NULL);
1099 int unit_set_cgroup_path(Unit *u, const char *path) {
1100 _cleanup_free_ char *p = NULL;
1112 if (streq_ptr(u->cgroup_path, p))
1116 r = hashmap_put(u->manager->cgroup_unit, p, u);
1121 unit_release_cgroup(u);
1129 int unit_watch_cgroup(Unit *u) {
1130 _cleanup_free_ char *events = NULL;
1135 if (!u->cgroup_path)
1138 if (u->cgroup_inotify_wd >= 0)
1141 /* Only applies to the unified hierarchy */
1144 return log_unit_error_errno(u, r, "Failed detect whether the unified hierarchy is used: %m");
1148 /* Don't watch the root slice, it's pointless. */
1149 if (unit_has_name(u, SPECIAL_ROOT_SLICE))
1152 r = hashmap_ensure_allocated(&u->manager->cgroup_inotify_wd_unit, &trivial_hash_ops);
1156 r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, "cgroup.events", &events);
1160 u->cgroup_inotify_wd = inotify_add_watch(u->manager->cgroup_inotify_fd, events, IN_MODIFY);
1161 if (u->cgroup_inotify_wd < 0) {
1163 if (errno == ENOENT) /* If the directory is already
1164 * gone we don't need to track
1165 * it, so this is not an error */
1168 return log_unit_error_errno(u, errno, "Failed to add inotify watch descriptor for control group %s: %m", u->cgroup_path);
1171 r = hashmap_put(u->manager->cgroup_inotify_wd_unit, INT_TO_PTR(u->cgroup_inotify_wd), u);
1173 return log_unit_error_errno(u, r, "Failed to add inotify watch descriptor to hash map: %m");
1178 static int unit_create_cgroup(
1180 CGroupMask target_mask,
1181 CGroupMask enable_mask) {
1188 c = unit_get_cgroup_context(u);
1192 if (!u->cgroup_path) {
1193 _cleanup_free_ char *path = NULL;
1195 path = unit_default_cgroup_path(u);
1199 r = unit_set_cgroup_path(u, path);
1201 return log_unit_error_errno(u, r, "Control group %s exists already.", path);
1203 return log_unit_error_errno(u, r, "Failed to set unit's control group path to %s: %m", path);
1206 /* First, create our own group */
1207 r = cg_create_everywhere(u->manager->cgroup_supported, target_mask, u->cgroup_path);
1209 return log_unit_error_errno(u, r, "Failed to create cgroup %s: %m", u->cgroup_path);
1211 /* Start watching it */
1212 (void) unit_watch_cgroup(u);
1214 /* Enable all controllers we need */
1215 r = cg_enable_everywhere(u->manager->cgroup_supported, enable_mask, u->cgroup_path);
1217 log_unit_warning_errno(u, r, "Failed to enable controllers on cgroup %s, ignoring: %m", u->cgroup_path);
1219 /* Keep track that this is now realized */
1220 u->cgroup_realized = true;
1221 u->cgroup_realized_mask = target_mask;
1222 u->cgroup_enabled_mask = enable_mask;
1224 if (u->type != UNIT_SLICE && !c->delegate) {
1226 /* Then, possibly move things over, but not if
1227 * subgroups may contain processes, which is the case
1228 * for slice and delegation units. */
1229 r = cg_migrate_everywhere(u->manager->cgroup_supported, u->cgroup_path, u->cgroup_path, migrate_callback, u);
1231 log_unit_warning_errno(u, r, "Failed to migrate cgroup from to %s, ignoring: %m", u->cgroup_path);
1237 int unit_attach_pids_to_cgroup(Unit *u) {
1241 r = unit_realize_cgroup(u);
1245 r = cg_attach_many_everywhere(u->manager->cgroup_supported, u->cgroup_path, u->pids, migrate_callback, u);
1252 static bool unit_has_mask_realized(Unit *u, CGroupMask target_mask, CGroupMask enable_mask) {
1255 return u->cgroup_realized && u->cgroup_realized_mask == target_mask && u->cgroup_enabled_mask == enable_mask;
1258 /* Check if necessary controllers and attributes for a unit are in place.
1260 * If so, do nothing.
1261 * If not, create paths, move processes over, and set attributes.
1263 * Returns 0 on success and < 0 on failure. */
1264 static int unit_realize_cgroup_now(Unit *u, ManagerState state) {
1265 CGroupMask target_mask, enable_mask;
1270 if (u->in_cgroup_queue) {
1271 LIST_REMOVE(cgroup_queue, u->manager->cgroup_queue, u);
1272 u->in_cgroup_queue = false;
1275 target_mask = unit_get_target_mask(u);
1276 enable_mask = unit_get_enable_mask(u);
1278 if (unit_has_mask_realized(u, target_mask, enable_mask))
1281 /* First, realize parents */
1282 if (UNIT_ISSET(u->slice)) {
1283 r = unit_realize_cgroup_now(UNIT_DEREF(u->slice), state);
1288 /* And then do the real work */
1289 r = unit_create_cgroup(u, target_mask, enable_mask);
1293 /* Finally, apply the necessary attributes. */
1294 cgroup_context_apply(u, target_mask, state);
1299 static void unit_add_to_cgroup_queue(Unit *u) {
1301 if (u->in_cgroup_queue)
1304 LIST_PREPEND(cgroup_queue, u->manager->cgroup_queue, u);
1305 u->in_cgroup_queue = true;
1308 unsigned manager_dispatch_cgroup_queue(Manager *m) {
1314 state = manager_state(m);
1316 while ((i = m->cgroup_queue)) {
1317 assert(i->in_cgroup_queue);
1319 r = unit_realize_cgroup_now(i, state);
1321 log_warning_errno(r, "Failed to realize cgroups for queued unit %s, ignoring: %m", i->id);
1329 static void unit_queue_siblings(Unit *u) {
1332 /* This adds the siblings of the specified unit and the
1333 * siblings of all parent units to the cgroup queue. (But
1334 * neither the specified unit itself nor the parents.) */
1336 while ((slice = UNIT_DEREF(u->slice))) {
1340 SET_FOREACH(m, slice->dependencies[UNIT_BEFORE], i) {
1344 /* Skip units that have a dependency on the slice
1345 * but aren't actually in it. */
1346 if (UNIT_DEREF(m->slice) != slice)
1349 /* No point in doing cgroup application for units
1350 * without active processes. */
1351 if (UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(m)))
1354 /* If the unit doesn't need any new controllers
1355 * and has current ones realized, it doesn't need
1357 if (unit_has_mask_realized(m, unit_get_target_mask(m), unit_get_enable_mask(m)))
1360 unit_add_to_cgroup_queue(m);
1367 int unit_realize_cgroup(Unit *u) {
1370 if (!UNIT_HAS_CGROUP_CONTEXT(u))
1373 /* So, here's the deal: when realizing the cgroups for this
1374 * unit, we need to first create all parents, but there's more
1375 * actually: for the weight-based controllers we also need to
1376 * make sure that all our siblings (i.e. units that are in the
1377 * same slice as we are) have cgroups, too. Otherwise, things
1378 * would become very uneven as each of their processes would
1379 * get as much resources as all our group together. This call
1380 * will synchronously create the parent cgroups, but will
1381 * defer work on the siblings to the next event loop
1384 /* Add all sibling slices to the cgroup queue. */
1385 unit_queue_siblings(u);
1387 /* And realize this one now (and apply the values) */
1388 return unit_realize_cgroup_now(u, manager_state(u->manager));
1391 void unit_release_cgroup(Unit *u) {
1394 /* Forgets all cgroup details for this cgroup */
1396 if (u->cgroup_path) {
1397 (void) hashmap_remove(u->manager->cgroup_unit, u->cgroup_path);
1398 u->cgroup_path = mfree(u->cgroup_path);
1401 if (u->cgroup_inotify_wd >= 0) {
1402 if (inotify_rm_watch(u->manager->cgroup_inotify_fd, u->cgroup_inotify_wd) < 0)
1403 log_unit_debug_errno(u, errno, "Failed to remove cgroup inotify watch %i for %s, ignoring", u->cgroup_inotify_wd, u->id);
1405 (void) hashmap_remove(u->manager->cgroup_inotify_wd_unit, INT_TO_PTR(u->cgroup_inotify_wd));
1406 u->cgroup_inotify_wd = -1;
1410 void unit_prune_cgroup(Unit *u) {
1416 /* Removes the cgroup, if empty and possible, and stops watching it. */
1418 if (!u->cgroup_path)
1421 is_root_slice = unit_has_name(u, SPECIAL_ROOT_SLICE);
1423 r = cg_trim_everywhere(u->manager->cgroup_supported, u->cgroup_path, !is_root_slice);
1425 log_unit_debug_errno(u, r, "Failed to destroy cgroup %s, ignoring: %m", u->cgroup_path);
1432 unit_release_cgroup(u);
1434 u->cgroup_realized = false;
1435 u->cgroup_realized_mask = 0;
1436 u->cgroup_enabled_mask = 0;
1439 int unit_search_main_pid(Unit *u, pid_t *ret) {
1440 _cleanup_fclose_ FILE *f = NULL;
1441 pid_t pid = 0, npid, mypid;
1447 if (!u->cgroup_path)
1450 r = cg_enumerate_processes(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, &f);
1455 while (cg_read_pid(f, &npid) > 0) {
1461 /* Ignore processes that aren't our kids */
1462 if (get_process_ppid(npid, &ppid) >= 0 && ppid != mypid)
1466 /* Dang, there's more than one daemonized PID
1467 in this group, so we don't know what process
1468 is the main process. */
1479 static int unit_watch_pids_in_path(Unit *u, const char *path) {
1480 _cleanup_closedir_ DIR *d = NULL;
1481 _cleanup_fclose_ FILE *f = NULL;
1487 r = cg_enumerate_processes(SYSTEMD_CGROUP_CONTROLLER, path, &f);
1493 while ((r = cg_read_pid(f, &pid)) > 0) {
1494 r = unit_watch_pid(u, pid);
1495 if (r < 0 && ret >= 0)
1499 if (r < 0 && ret >= 0)
1503 r = cg_enumerate_subgroups(SYSTEMD_CGROUP_CONTROLLER, path, &d);
1510 while ((r = cg_read_subgroup(d, &fn)) > 0) {
1511 _cleanup_free_ char *p = NULL;
1513 p = strjoin(path, "/", fn, NULL);
1519 r = unit_watch_pids_in_path(u, p);
1520 if (r < 0 && ret >= 0)
1524 if (r < 0 && ret >= 0)
1531 int unit_watch_all_pids(Unit *u) {
1534 /* Adds all PIDs from our cgroup to the set of PIDs we
1535 * watch. This is a fallback logic for cases where we do not
1536 * get reliable cgroup empty notifications: we try to use
1537 * SIGCHLD as replacement. */
1539 if (!u->cgroup_path)
1542 if (cg_unified() > 0) /* On unified we can use proper notifications */
1545 return unit_watch_pids_in_path(u, u->cgroup_path);
1548 int unit_notify_cgroup_empty(Unit *u) {
1553 if (!u->cgroup_path)
1556 r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path);
1560 unit_add_to_gc_queue(u);
1562 if (UNIT_VTABLE(u)->notify_cgroup_empty)
1563 UNIT_VTABLE(u)->notify_cgroup_empty(u);
1568 static int on_cgroup_inotify_event(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
1569 Manager *m = userdata;
1576 union inotify_event_buffer buffer;
1577 struct inotify_event *e;
1580 l = read(fd, &buffer, sizeof(buffer));
1582 if (errno == EINTR || errno == EAGAIN)
1585 return log_error_errno(errno, "Failed to read control group inotify events: %m");
1588 FOREACH_INOTIFY_EVENT(e, buffer, l) {
1592 /* Queue overflow has no watch descriptor */
1595 if (e->mask & IN_IGNORED)
1596 /* The watch was just removed */
1599 u = hashmap_get(m->cgroup_inotify_wd_unit, INT_TO_PTR(e->wd));
1600 if (!u) /* Not that inotify might deliver
1601 * events for a watch even after it
1602 * was removed, because it was queued
1603 * before the removal. Let's ignore
1604 * this here safely. */
1607 (void) unit_notify_cgroup_empty(u);
1613 int manager_setup_cgroup(Manager *m) {
1614 _cleanup_free_ char *path = NULL;
1621 /* 1. Determine hierarchy */
1622 m->cgroup_root = mfree(m->cgroup_root);
1623 r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 0, &m->cgroup_root);
1625 return log_error_errno(r, "Cannot determine cgroup we are running in: %m");
1627 #if 0 /// elogind does not support systemd scopes and slices
1628 /* Chop off the init scope, if we are already located in it */
1629 e = endswith(m->cgroup_root, "/" SPECIAL_INIT_SCOPE);
1631 /* LEGACY: Also chop off the system slice if we are in
1632 * it. This is to support live upgrades from older systemd
1633 * versions where PID 1 was moved there. Also see
1634 * cg_get_root_path(). */
1635 if (!e && MANAGER_IS_SYSTEM(m)) {
1636 e = endswith(m->cgroup_root, "/" SPECIAL_SYSTEM_SLICE);
1638 e = endswith(m->cgroup_root, "/system"); /* even more legacy */
1644 /* And make sure to store away the root value without trailing
1645 * slash, even for the root dir, so that we can easily prepend
1647 while ((e = endswith(m->cgroup_root, "/")))
1649 log_debug_elogind("Cgroup Controller \"%s\" -> root \"%s\"",
1650 SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root);
1653 r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, NULL, &path);
1655 return log_error_errno(r, "Cannot find cgroup mount point: %m");
1657 unified = cg_unified();
1659 return log_error_errno(r, "Couldn't determine if we are running in the unified hierarchy: %m");
1661 log_debug("Unified cgroup hierarchy is located at %s.", path);
1663 log_debug("Using cgroup controller " SYSTEMD_CGROUP_CONTROLLER ". File system hierarchy is at %s.", path);
1666 const char *scope_path;
1668 /* 3. Install agent */
1671 /* In the unified hierarchy we can get
1672 * cgroup empty notifications via inotify. */
1674 #if 0 /// elogind does not support the unified hierarchy, yet.
1675 m->cgroup_inotify_event_source = sd_event_source_unref(m->cgroup_inotify_event_source);
1676 safe_close(m->cgroup_inotify_fd);
1678 m->cgroup_inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC);
1679 if (m->cgroup_inotify_fd < 0)
1680 return log_error_errno(errno, "Failed to create control group inotify object: %m");
1682 r = sd_event_add_io(m->event, &m->cgroup_inotify_event_source, m->cgroup_inotify_fd, EPOLLIN, on_cgroup_inotify_event, m);
1684 return log_error_errno(r, "Failed to watch control group inotify object: %m");
1686 /* Process cgroup empty notifications early, but after service notifications and SIGCHLD. Also
1687 * see handling of cgroup agent notifications, for the classic cgroup hierarchy support. */
1688 r = sd_event_source_set_priority(m->cgroup_inotify_event_source, SD_EVENT_PRIORITY_NORMAL-5);
1690 return log_error_errno(r, "Failed to set priority of inotify event source: %m");
1692 (void) sd_event_source_set_description(m->cgroup_inotify_event_source, "cgroup-inotify");
1695 return log_error_errno(EOPNOTSUPP, "Unified cgroup hierarchy not supported: %m");
1697 } else if (MANAGER_IS_SYSTEM(m)) {
1699 /* On the legacy hierarchy we only get
1700 * notifications via cgroup agents. (Which
1701 * isn't really reliable, since it does not
1702 * generate events when control groups with
1703 * children run empty. */
1705 r = cg_install_release_agent(SYSTEMD_CGROUP_CONTROLLER, SYSTEMD_CGROUP_AGENT_PATH);
1707 log_warning_errno(r, "Failed to install release agent, ignoring: %m");
1709 log_debug("Installed release agent.");
1711 log_debug("Release agent already installed.");
1714 #if 0 /// elogind is not meant to run in systemd init scope
1715 /* 4. Make sure we are in the special "init.scope" unit in the root slice. */
1716 scope_path = strjoina(m->cgroup_root, "/" SPECIAL_INIT_SCOPE);
1717 r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, scope_path, 0);
1719 if (streq(SYSTEMD_CGROUP_CONTROLLER, "name=elogind"))
1720 // we are our own cgroup controller
1721 scope_path = strjoina("");
1722 else if (streq(m->cgroup_root, "/elogind"))
1723 // root already is our cgroup
1724 scope_path = strjoina(m->cgroup_root);
1726 // we have to create our own group
1727 scope_path = strjoina(m->cgroup_root, "/elogind");
1728 r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, scope_path, 0);
1731 return log_error_errno(r, "Failed to create %s control group: %m", scope_path);
1732 log_debug_elogind("Created control group \"%s\"", scope_path);
1734 /* also, move all other userspace processes remaining
1735 * in the root cgroup into that scope. */
1736 r = cg_migrate(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, SYSTEMD_CGROUP_CONTROLLER, scope_path, 0);
1738 log_warning_errno(r, "Couldn't move remaining userspace processes, ignoring: %m");
1740 /* 5. And pin it, so that it cannot be unmounted */
1741 safe_close(m->pin_cgroupfs_fd);
1742 m->pin_cgroupfs_fd = open(path, O_RDONLY|O_CLOEXEC|O_DIRECTORY|O_NOCTTY|O_NONBLOCK);
1743 if (m->pin_cgroupfs_fd < 0)
1744 return log_error_errno(errno, "Failed to open pin file: %m");
1746 /* 6. Always enable hierarchical support if it exists... */
1748 (void) cg_set_attribute("memory", "/", "memory.use_hierarchy", "1");
1751 /* 7. Figure out which controllers are supported */
1752 r = cg_mask_supported(&m->cgroup_supported);
1754 return log_error_errno(r, "Failed to determine supported controllers: %m");
1756 for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++)
1757 log_debug("Controller '%s' supported: %s", cgroup_controller_to_string(c), yes_no(m->cgroup_supported & CGROUP_CONTROLLER_TO_MASK(c)));
1762 void manager_shutdown_cgroup(Manager *m, bool delete) {
1765 /* We can't really delete the group, since we are in it. But
1767 if (delete && m->cgroup_root)
1768 (void) cg_trim(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, false);
1770 #if 0 /// elogind does not support the unified hierarchy, yet.
1771 m->cgroup_inotify_wd_unit = hashmap_free(m->cgroup_inotify_wd_unit);
1773 m->cgroup_inotify_event_source = sd_event_source_unref(m->cgroup_inotify_event_source);
1774 m->cgroup_inotify_fd = safe_close(m->cgroup_inotify_fd);
1777 m->pin_cgroupfs_fd = safe_close(m->pin_cgroupfs_fd);
1779 m->cgroup_root = mfree(m->cgroup_root);
1782 #if 0 /// UNNEEDED by elogind
1783 Unit* manager_get_unit_by_cgroup(Manager *m, const char *cgroup) {
1790 u = hashmap_get(m->cgroup_unit, cgroup);
1794 p = strdupa(cgroup);
1798 e = strrchr(p, '/');
1800 return hashmap_get(m->cgroup_unit, SPECIAL_ROOT_SLICE);
1804 u = hashmap_get(m->cgroup_unit, p);
1810 Unit *manager_get_unit_by_pid_cgroup(Manager *m, pid_t pid) {
1811 _cleanup_free_ char *cgroup = NULL;
1819 r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, pid, &cgroup);
1823 return manager_get_unit_by_cgroup(m, cgroup);
1826 Unit *manager_get_unit_by_pid(Manager *m, pid_t pid) {
1835 return hashmap_get(m->units, SPECIAL_INIT_SCOPE);
1837 u = hashmap_get(m->watch_pids1, PID_TO_PTR(pid));
1841 u = hashmap_get(m->watch_pids2, PID_TO_PTR(pid));
1845 return manager_get_unit_by_pid_cgroup(m, pid);
1849 #if 0 /// elogind must substitute this with its own variant
1850 int manager_notify_cgroup_empty(Manager *m, const char *cgroup) {
1856 log_debug("Got cgroup empty notification for: %s", cgroup);
1858 u = manager_get_unit_by_cgroup(m, cgroup);
1862 return unit_notify_cgroup_empty(u);
1865 int manager_notify_cgroup_empty(Manager *m, const char *cgroup) {
1871 log_debug("Got cgroup empty notification for: %s", cgroup);
1873 s = hashmap_get(m->sessions, cgroup);
1876 session_finalize(s);
1879 log_warning("Session not found: %s", cgroup);
1885 #if 0 /// UNNEEDED by elogind
1886 int unit_get_memory_current(Unit *u, uint64_t *ret) {
1887 _cleanup_free_ char *v = NULL;
1893 if (!u->cgroup_path)
1896 if ((u->cgroup_realized_mask & CGROUP_MASK_MEMORY) == 0)
1899 if (cg_unified() <= 0)
1900 r = cg_get_attribute("memory", u->cgroup_path, "memory.usage_in_bytes", &v);
1902 r = cg_get_attribute("memory", u->cgroup_path, "memory.current", &v);
1908 return safe_atou64(v, ret);
1911 int unit_get_tasks_current(Unit *u, uint64_t *ret) {
1912 _cleanup_free_ char *v = NULL;
1918 if (!u->cgroup_path)
1921 if ((u->cgroup_realized_mask & CGROUP_MASK_PIDS) == 0)
1924 r = cg_get_attribute("pids", u->cgroup_path, "pids.current", &v);
1930 return safe_atou64(v, ret);
1933 static int unit_get_cpu_usage_raw(Unit *u, nsec_t *ret) {
1934 _cleanup_free_ char *v = NULL;
1941 if (!u->cgroup_path)
1944 if ((u->cgroup_realized_mask & CGROUP_MASK_CPUACCT) == 0)
1947 r = cg_get_attribute("cpuacct", u->cgroup_path, "cpuacct.usage", &v);
1953 r = safe_atou64(v, &ns);
1961 int unit_get_cpu_usage(Unit *u, nsec_t *ret) {
1965 r = unit_get_cpu_usage_raw(u, &ns);
1969 if (ns > u->cpuacct_usage_base)
1970 ns -= u->cpuacct_usage_base;
1978 int unit_reset_cpu_usage(Unit *u) {
1984 r = unit_get_cpu_usage_raw(u, &ns);
1986 u->cpuacct_usage_base = 0;
1990 u->cpuacct_usage_base = ns;
1994 bool unit_cgroup_delegate(Unit *u) {
1999 c = unit_get_cgroup_context(u);
2006 void unit_invalidate_cgroup(Unit *u, CGroupMask m) {
2009 if (!UNIT_HAS_CGROUP_CONTEXT(u))
2015 /* always invalidate compat pairs together */
2016 if (m & (CGROUP_MASK_IO | CGROUP_MASK_BLKIO))
2017 m |= CGROUP_MASK_IO | CGROUP_MASK_BLKIO;
2019 if ((u->cgroup_realized_mask & m) == 0)
2022 u->cgroup_realized_mask &= ~m;
2023 unit_add_to_cgroup_queue(u);
2026 void manager_invalidate_startup_units(Manager *m) {
2032 SET_FOREACH(u, m->startup_units, i)
2033 unit_invalidate_cgroup(u, CGROUP_MASK_CPU|CGROUP_MASK_IO|CGROUP_MASK_BLKIO);
2036 static const char* const cgroup_device_policy_table[_CGROUP_DEVICE_POLICY_MAX] = {
2037 [CGROUP_AUTO] = "auto",
2038 [CGROUP_CLOSED] = "closed",
2039 [CGROUP_STRICT] = "strict",
2042 DEFINE_STRING_TABLE_LOOKUP(cgroup_device_policy, CGroupDevicePolicy);