1 /* SPDX-License-Identifier: LGPL-2.1+ */
6 #include "sd-messages.h"
8 #include "alloc-util.h"
9 #include "blockdev-util.h"
10 #include "bpf-devices.h"
11 #include "bpf-firewall.h"
12 #include "btrfs-util.h"
13 #include "bus-error.h"
14 #include "cgroup-util.h"
19 #include "nulstr-util.h"
20 #include "parse-util.h"
21 #include "path-util.h"
22 #include "process-util.h"
23 #include "procfs-util.h"
25 #include "stat-util.h"
26 #include "stdio-util.h"
27 #include "string-table.h"
28 #include "string-util.h"
31 #define CGROUP_CPU_QUOTA_DEFAULT_PERIOD_USEC ((usec_t) 100 * USEC_PER_MSEC)
33 /* Returns the log level to use when cgroup attribute writes fail. When an attribute is missing or we have access
34 * problems we downgrade to LOG_DEBUG. This is supposed to be nice to container managers and kernels which want to mask
35 * out specific attributes from us. */
36 #define LOG_LEVEL_CGROUP_WRITE(r) (IN_SET(abs(r), ENOENT, EROFS, EACCES, EPERM) ? LOG_DEBUG : LOG_WARNING)
38 bool manager_owns_host_root_cgroup(Manager
*m
) {
41 /* Returns true if we are managing the root cgroup. Note that it isn't sufficient to just check whether the
42 * group root path equals "/" since that will also be the case if CLONE_NEWCGROUP is in the mix. Since there's
43 * appears to be no nice way to detect whether we are in a CLONE_NEWCGROUP namespace we instead just check if
44 * we run in any kind of container virtualization. */
46 if (MANAGER_IS_USER(m
))
49 if (detect_container() > 0)
52 return empty_or_root(m
->cgroup_root
);
55 bool unit_has_host_root_cgroup(Unit
*u
) {
58 /* Returns whether this unit manages the root cgroup. This will return true if this unit is the root slice and
59 * the manager manages the root cgroup. */
61 if (!manager_owns_host_root_cgroup(u
->manager
))
64 return unit_has_name(u
, SPECIAL_ROOT_SLICE
);
67 static int set_attribute_and_warn(Unit
*u
, const char *controller
, const char *attribute
, const char *value
) {
70 r
= cg_set_attribute(controller
, u
->cgroup_path
, attribute
, value
);
72 log_unit_full(u
, LOG_LEVEL_CGROUP_WRITE(r
), r
, "Failed to set '%s' attribute on '%s' to '%.*s': %m",
73 strna(attribute
), isempty(u
->cgroup_path
) ? "/" : u
->cgroup_path
, (int) strcspn(value
, NEWLINE
), value
);
78 static void cgroup_compat_warn(void) {
79 static bool cgroup_compat_warned
= false;
81 if (cgroup_compat_warned
)
84 log_warning("cgroup compatibility translation between legacy and unified hierarchy settings activated. "
85 "See cgroup-compat debug messages for details.");
87 cgroup_compat_warned
= true;
90 #define log_cgroup_compat(unit, fmt, ...) do { \
91 cgroup_compat_warn(); \
92 log_unit_debug(unit, "cgroup-compat: " fmt, ##__VA_ARGS__); \
95 void cgroup_context_init(CGroupContext
*c
) {
98 /* Initialize everything to the kernel defaults. */
100 *c
= (CGroupContext
) {
101 .cpu_weight
= CGROUP_WEIGHT_INVALID
,
102 .startup_cpu_weight
= CGROUP_WEIGHT_INVALID
,
103 .cpu_quota_per_sec_usec
= USEC_INFINITY
,
104 .cpu_quota_period_usec
= USEC_INFINITY
,
106 .cpu_shares
= CGROUP_CPU_SHARES_INVALID
,
107 .startup_cpu_shares
= CGROUP_CPU_SHARES_INVALID
,
109 .memory_high
= CGROUP_LIMIT_MAX
,
110 .memory_max
= CGROUP_LIMIT_MAX
,
111 .memory_swap_max
= CGROUP_LIMIT_MAX
,
113 .memory_limit
= CGROUP_LIMIT_MAX
,
115 .io_weight
= CGROUP_WEIGHT_INVALID
,
116 .startup_io_weight
= CGROUP_WEIGHT_INVALID
,
118 .blockio_weight
= CGROUP_BLKIO_WEIGHT_INVALID
,
119 .startup_blockio_weight
= CGROUP_BLKIO_WEIGHT_INVALID
,
121 .tasks_max
= CGROUP_LIMIT_MAX
,
125 void cgroup_context_free_device_allow(CGroupContext
*c
, CGroupDeviceAllow
*a
) {
129 LIST_REMOVE(device_allow
, c
->device_allow
, a
);
134 void cgroup_context_free_io_device_weight(CGroupContext
*c
, CGroupIODeviceWeight
*w
) {
138 LIST_REMOVE(device_weights
, c
->io_device_weights
, w
);
143 void cgroup_context_free_io_device_latency(CGroupContext
*c
, CGroupIODeviceLatency
*l
) {
147 LIST_REMOVE(device_latencies
, c
->io_device_latencies
, l
);
152 void cgroup_context_free_io_device_limit(CGroupContext
*c
, CGroupIODeviceLimit
*l
) {
156 LIST_REMOVE(device_limits
, c
->io_device_limits
, l
);
161 void cgroup_context_free_blockio_device_weight(CGroupContext
*c
, CGroupBlockIODeviceWeight
*w
) {
165 LIST_REMOVE(device_weights
, c
->blockio_device_weights
, w
);
170 void cgroup_context_free_blockio_device_bandwidth(CGroupContext
*c
, CGroupBlockIODeviceBandwidth
*b
) {
174 LIST_REMOVE(device_bandwidths
, c
->blockio_device_bandwidths
, b
);
179 void cgroup_context_done(CGroupContext
*c
) {
182 while (c
->io_device_weights
)
183 cgroup_context_free_io_device_weight(c
, c
->io_device_weights
);
185 while (c
->io_device_latencies
)
186 cgroup_context_free_io_device_latency(c
, c
->io_device_latencies
);
188 while (c
->io_device_limits
)
189 cgroup_context_free_io_device_limit(c
, c
->io_device_limits
);
191 while (c
->blockio_device_weights
)
192 cgroup_context_free_blockio_device_weight(c
, c
->blockio_device_weights
);
194 while (c
->blockio_device_bandwidths
)
195 cgroup_context_free_blockio_device_bandwidth(c
, c
->blockio_device_bandwidths
);
197 while (c
->device_allow
)
198 cgroup_context_free_device_allow(c
, c
->device_allow
);
200 c
->ip_address_allow
= ip_address_access_free_all(c
->ip_address_allow
);
201 c
->ip_address_deny
= ip_address_access_free_all(c
->ip_address_deny
);
203 c
->ip_filters_ingress
= strv_free(c
->ip_filters_ingress
);
204 c
->ip_filters_egress
= strv_free(c
->ip_filters_egress
);
206 cpu_set_reset(&c
->cpuset_cpus
);
207 cpu_set_reset(&c
->cpuset_mems
);
210 void cgroup_context_dump(CGroupContext
*c
, FILE* f
, const char *prefix
) {
211 _cleanup_free_
char *disable_controllers_str
= NULL
;
212 _cleanup_free_
char *cpuset_cpus
= NULL
;
213 _cleanup_free_
char *cpuset_mems
= NULL
;
214 CGroupIODeviceLimit
*il
;
215 CGroupIODeviceWeight
*iw
;
216 CGroupIODeviceLatency
*l
;
217 CGroupBlockIODeviceBandwidth
*b
;
218 CGroupBlockIODeviceWeight
*w
;
219 CGroupDeviceAllow
*a
;
220 IPAddressAccessItem
*iaai
;
222 char u
[FORMAT_TIMESPAN_MAX
];
223 char v
[FORMAT_TIMESPAN_MAX
];
228 prefix
= strempty(prefix
);
230 (void) cg_mask_to_string(c
->disable_controllers
, &disable_controllers_str
);
232 cpuset_cpus
= cpu_set_to_range_string(&c
->cpuset_cpus
);
233 cpuset_mems
= cpu_set_to_range_string(&c
->cpuset_mems
);
236 "%sCPUAccounting=%s\n"
237 "%sIOAccounting=%s\n"
238 "%sBlockIOAccounting=%s\n"
239 "%sMemoryAccounting=%s\n"
240 "%sTasksAccounting=%s\n"
241 "%sIPAccounting=%s\n"
242 "%sCPUWeight=%" PRIu64
"\n"
243 "%sStartupCPUWeight=%" PRIu64
"\n"
244 "%sCPUShares=%" PRIu64
"\n"
245 "%sStartupCPUShares=%" PRIu64
"\n"
246 "%sCPUQuotaPerSecSec=%s\n"
247 "%sCPUQuotaPeriodSec=%s\n"
249 "%sAllowedMemoryNodes=%s\n"
250 "%sIOWeight=%" PRIu64
"\n"
251 "%sStartupIOWeight=%" PRIu64
"\n"
252 "%sBlockIOWeight=%" PRIu64
"\n"
253 "%sStartupBlockIOWeight=%" PRIu64
"\n"
254 "%sDefaultMemoryMin=%" PRIu64
"\n"
255 "%sDefaultMemoryLow=%" PRIu64
"\n"
256 "%sMemoryMin=%" PRIu64
"\n"
257 "%sMemoryLow=%" PRIu64
"\n"
258 "%sMemoryHigh=%" PRIu64
"\n"
259 "%sMemoryMax=%" PRIu64
"\n"
260 "%sMemorySwapMax=%" PRIu64
"\n"
261 "%sMemoryLimit=%" PRIu64
"\n"
262 "%sTasksMax=%" PRIu64
"\n"
263 "%sDevicePolicy=%s\n"
264 "%sDisableControllers=%s\n"
266 prefix
, yes_no(c
->cpu_accounting
),
267 prefix
, yes_no(c
->io_accounting
),
268 prefix
, yes_no(c
->blockio_accounting
),
269 prefix
, yes_no(c
->memory_accounting
),
270 prefix
, yes_no(c
->tasks_accounting
),
271 prefix
, yes_no(c
->ip_accounting
),
272 prefix
, c
->cpu_weight
,
273 prefix
, c
->startup_cpu_weight
,
274 prefix
, c
->cpu_shares
,
275 prefix
, c
->startup_cpu_shares
,
276 prefix
, format_timespan(u
, sizeof(u
), c
->cpu_quota_per_sec_usec
, 1),
277 prefix
, format_timespan(v
, sizeof(v
), c
->cpu_quota_period_usec
, 1),
280 prefix
, c
->io_weight
,
281 prefix
, c
->startup_io_weight
,
282 prefix
, c
->blockio_weight
,
283 prefix
, c
->startup_blockio_weight
,
284 prefix
, c
->default_memory_min
,
285 prefix
, c
->default_memory_low
,
286 prefix
, c
->memory_min
,
287 prefix
, c
->memory_low
,
288 prefix
, c
->memory_high
,
289 prefix
, c
->memory_max
,
290 prefix
, c
->memory_swap_max
,
291 prefix
, c
->memory_limit
,
292 prefix
, c
->tasks_max
,
293 prefix
, cgroup_device_policy_to_string(c
->device_policy
),
294 prefix
, strempty(disable_controllers_str
),
295 prefix
, yes_no(c
->delegate
));
298 _cleanup_free_
char *t
= NULL
;
300 (void) cg_mask_to_string(c
->delegate_controllers
, &t
);
302 fprintf(f
, "%sDelegateControllers=%s\n",
307 LIST_FOREACH(device_allow
, a
, c
->device_allow
)
309 "%sDeviceAllow=%s %s%s%s\n",
312 a
->r
? "r" : "", a
->w
? "w" : "", a
->m
? "m" : "");
314 LIST_FOREACH(device_weights
, iw
, c
->io_device_weights
)
316 "%sIODeviceWeight=%s %" PRIu64
"\n",
321 LIST_FOREACH(device_latencies
, l
, c
->io_device_latencies
)
323 "%sIODeviceLatencyTargetSec=%s %s\n",
326 format_timespan(u
, sizeof(u
), l
->target_usec
, 1));
328 LIST_FOREACH(device_limits
, il
, c
->io_device_limits
) {
329 char buf
[FORMAT_BYTES_MAX
];
330 CGroupIOLimitType type
;
332 for (type
= 0; type
< _CGROUP_IO_LIMIT_TYPE_MAX
; type
++)
333 if (il
->limits
[type
] != cgroup_io_limit_defaults
[type
])
337 cgroup_io_limit_type_to_string(type
),
339 format_bytes(buf
, sizeof(buf
), il
->limits
[type
]));
342 LIST_FOREACH(device_weights
, w
, c
->blockio_device_weights
)
344 "%sBlockIODeviceWeight=%s %" PRIu64
,
349 LIST_FOREACH(device_bandwidths
, b
, c
->blockio_device_bandwidths
) {
350 char buf
[FORMAT_BYTES_MAX
];
352 if (b
->rbps
!= CGROUP_LIMIT_MAX
)
354 "%sBlockIOReadBandwidth=%s %s\n",
357 format_bytes(buf
, sizeof(buf
), b
->rbps
));
358 if (b
->wbps
!= CGROUP_LIMIT_MAX
)
360 "%sBlockIOWriteBandwidth=%s %s\n",
363 format_bytes(buf
, sizeof(buf
), b
->wbps
));
366 LIST_FOREACH(items
, iaai
, c
->ip_address_allow
) {
367 _cleanup_free_
char *k
= NULL
;
369 (void) in_addr_to_string(iaai
->family
, &iaai
->address
, &k
);
370 fprintf(f
, "%sIPAddressAllow=%s/%u\n", prefix
, strnull(k
), iaai
->prefixlen
);
373 LIST_FOREACH(items
, iaai
, c
->ip_address_deny
) {
374 _cleanup_free_
char *k
= NULL
;
376 (void) in_addr_to_string(iaai
->family
, &iaai
->address
, &k
);
377 fprintf(f
, "%sIPAddressDeny=%s/%u\n", prefix
, strnull(k
), iaai
->prefixlen
);
380 STRV_FOREACH(path
, c
->ip_filters_ingress
)
381 fprintf(f
, "%sIPIngressFilterPath=%s\n", prefix
, *path
);
383 STRV_FOREACH(path
, c
->ip_filters_egress
)
384 fprintf(f
, "%sIPEgressFilterPath=%s\n", prefix
, *path
);
387 int cgroup_add_device_allow(CGroupContext
*c
, const char *dev
, const char *mode
) {
388 _cleanup_free_ CGroupDeviceAllow
*a
= NULL
;
389 _cleanup_free_
char *d
= NULL
;
393 assert(isempty(mode
) || in_charset(mode
, "rwm"));
395 a
= new(CGroupDeviceAllow
, 1);
403 *a
= (CGroupDeviceAllow
) {
405 .r
= isempty(mode
) || strchr(mode
, 'r'),
406 .w
= isempty(mode
) || strchr(mode
, 'w'),
407 .m
= isempty(mode
) || strchr(mode
, 'm'),
410 LIST_PREPEND(device_allow
, c
->device_allow
, a
);
416 #define UNIT_DEFINE_ANCESTOR_MEMORY_LOOKUP(entry) \
417 uint64_t unit_get_ancestor_##entry(Unit *u) { \
420 /* 1. Is entry set in this unit? If so, use that. \
421 * 2. Is the default for this entry set in any \
422 * ancestor? If so, use that. \
423 * 3. Otherwise, return CGROUP_LIMIT_MIN. */ \
427 c = unit_get_cgroup_context(u); \
428 if (c && c->entry##_set) \
431 while ((u = UNIT_DEREF(u->slice))) { \
432 c = unit_get_cgroup_context(u); \
433 if (c && c->default_##entry##_set) \
434 return c->default_##entry; \
437 /* We've reached the root, but nobody had default for \
438 * this entry set, so set it to the kernel default. */ \
439 return CGROUP_LIMIT_MIN; \
442 UNIT_DEFINE_ANCESTOR_MEMORY_LOOKUP(memory_low
);
443 UNIT_DEFINE_ANCESTOR_MEMORY_LOOKUP(memory_min
);
445 static void cgroup_xattr_apply(Unit
*u
) {
446 char ids
[SD_ID128_STRING_MAX
];
451 if (!MANAGER_IS_SYSTEM(u
->manager
))
454 if (sd_id128_is_null(u
->invocation_id
))
457 r
= cg_set_xattr(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
,
458 "trusted.invocation_id",
459 sd_id128_to_string(u
->invocation_id
, ids
), 32,
462 log_unit_debug_errno(u
, r
, "Failed to set invocation ID on control group %s, ignoring: %m", u
->cgroup_path
);
465 static int lookup_block_device(const char *p
, dev_t
*ret
) {
473 r
= device_path_parse_major_minor(p
, &mode
, &rdev
);
474 if (r
== -ENODEV
) { /* not a parsable device node, need to go to disk */
476 if (stat(p
, &st
) < 0)
477 return log_warning_errno(errno
, "Couldn't stat device '%s': %m", p
);
478 rdev
= (dev_t
)st
.st_rdev
;
479 dev
= (dev_t
)st
.st_dev
;
482 return log_warning_errno(r
, "Failed to parse major/minor from path '%s': %m", p
);
485 log_warning("Device node '%s' is a character device, but block device needed.", p
);
487 } else if (S_ISBLK(mode
))
489 else if (major(dev
) != 0)
490 *ret
= dev
; /* If this is not a device node then use the block device this file is stored on */
492 /* If this is btrfs, getting the backing block device is a bit harder */
493 r
= btrfs_get_block_device(p
, ret
);
494 if (r
< 0 && r
!= -ENOTTY
)
495 return log_warning_errno(r
, "Failed to determine block device backing btrfs file system '%s': %m", p
);
497 log_warning("'%s' is not a block device node, and file system block device cannot be determined or is not local.", p
);
502 /* If this is a LUKS device, try to get the originating block device */
503 (void) block_get_originating(*ret
, ret
);
505 /* If this is a partition, try to get the originating block device */
506 (void) block_get_whole_disk(*ret
, ret
);
510 static int whitelist_device(BPFProgram
*prog
, const char *path
, const char *node
, const char *acc
) {
518 /* Some special handling for /dev/block/%u:%u, /dev/char/%u:%u, /run/systemd/inaccessible/chr and
519 * /run/systemd/inaccessible/blk paths. Instead of stat()ing these we parse out the major/minor directly. This
520 * means clients can use these path without the device node actually around */
521 r
= device_path_parse_major_minor(node
, &mode
, &rdev
);
524 return log_warning_errno(r
, "Couldn't parse major/minor from device path '%s': %m", node
);
527 if (stat(node
, &st
) < 0)
528 return log_warning_errno(errno
, "Couldn't stat device %s: %m", node
);
530 if (!S_ISCHR(st
.st_mode
) && !S_ISBLK(st
.st_mode
)) {
531 log_warning("%s is not a device.", node
);
534 rdev
= (dev_t
) st
.st_rdev
;
538 if (cg_all_unified() > 0) {
542 return cgroup_bpf_whitelist_device(prog
, S_ISCHR(mode
) ? BPF_DEVCG_DEV_CHAR
: BPF_DEVCG_DEV_BLOCK
,
543 major(rdev
), minor(rdev
), acc
);
546 char buf
[2+DECIMAL_STR_MAX(dev_t
)*2+2+4];
550 S_ISCHR(mode
) ? 'c' : 'b',
551 major(rdev
), minor(rdev
),
554 /* Changing the devices list of a populated cgroup might result in EINVAL, hence ignore EINVAL here. */
556 r
= cg_set_attribute("devices", path
, "devices.allow", buf
);
558 return log_full_errno(IN_SET(r
, -ENOENT
, -EROFS
, -EINVAL
, -EACCES
, -EPERM
) ? LOG_DEBUG
: LOG_WARNING
,
559 r
, "Failed to set devices.allow on %s: %m", path
);
565 static int whitelist_major(BPFProgram
*prog
, const char *path
, const char *name
, char type
, const char *acc
) {
566 _cleanup_fclose_
FILE *f
= NULL
;
567 char buf
[2+DECIMAL_STR_MAX(unsigned)+3+4];
574 assert(IN_SET(type
, 'b', 'c'));
576 if (streq(name
, "*")) {
577 /* If the name is a wildcard, then apply this list to all devices of this type */
579 if (cg_all_unified() > 0) {
583 (void) cgroup_bpf_whitelist_class(prog
, type
== 'c' ? BPF_DEVCG_DEV_CHAR
: BPF_DEVCG_DEV_BLOCK
, acc
);
585 xsprintf(buf
, "%c *:* %s", type
, acc
);
587 r
= cg_set_attribute("devices", path
, "devices.allow", buf
);
589 log_full_errno(IN_SET(r
, -ENOENT
, -EROFS
, -EINVAL
, -EACCES
) ? LOG_DEBUG
: LOG_WARNING
, r
,
590 "Failed to set devices.allow on %s: %m", path
);
595 if (safe_atou(name
, &maj
) >= 0 && DEVICE_MAJOR_VALID(maj
)) {
596 /* The name is numeric and suitable as major. In that case, let's take is major, and create the entry
599 if (cg_all_unified() > 0) {
603 (void) cgroup_bpf_whitelist_major(prog
,
604 type
== 'c' ? BPF_DEVCG_DEV_CHAR
: BPF_DEVCG_DEV_BLOCK
,
607 xsprintf(buf
, "%c %u:* %s", type
, maj
, acc
);
609 r
= cg_set_attribute("devices", path
, "devices.allow", buf
);
611 log_full_errno(IN_SET(r
, -ENOENT
, -EROFS
, -EINVAL
, -EACCES
) ? LOG_DEBUG
: LOG_WARNING
, r
,
612 "Failed to set devices.allow on %s: %m", path
);
618 f
= fopen("/proc/devices", "re");
620 return log_warning_errno(errno
, "Cannot open /proc/devices to resolve %s (%c): %m", name
, type
);
623 _cleanup_free_
char *line
= NULL
;
626 r
= read_line(f
, LONG_LINE_MAX
, &line
);
628 return log_warning_errno(r
, "Failed to read /proc/devices: %m");
632 if (type
== 'c' && streq(line
, "Character devices:")) {
637 if (type
== 'b' && streq(line
, "Block devices:")) {
652 w
= strpbrk(p
, WHITESPACE
);
657 r
= safe_atou(p
, &maj
);
664 w
+= strspn(w
, WHITESPACE
);
666 if (fnmatch(name
, w
, 0) != 0)
669 if (cg_all_unified() > 0) {
673 (void) cgroup_bpf_whitelist_major(prog
,
674 type
== 'c' ? BPF_DEVCG_DEV_CHAR
: BPF_DEVCG_DEV_BLOCK
,
683 /* Changing the devices list of a populated cgroup might result in EINVAL, hence ignore EINVAL
686 r
= cg_set_attribute("devices", path
, "devices.allow", buf
);
688 log_full_errno(IN_SET(r
, -ENOENT
, -EROFS
, -EINVAL
, -EACCES
, -EPERM
) ? LOG_DEBUG
: LOG_WARNING
,
689 r
, "Failed to set devices.allow on %s: %m", path
);
696 static bool cgroup_context_has_cpu_weight(CGroupContext
*c
) {
697 return c
->cpu_weight
!= CGROUP_WEIGHT_INVALID
||
698 c
->startup_cpu_weight
!= CGROUP_WEIGHT_INVALID
;
701 static bool cgroup_context_has_cpu_shares(CGroupContext
*c
) {
702 return c
->cpu_shares
!= CGROUP_CPU_SHARES_INVALID
||
703 c
->startup_cpu_shares
!= CGROUP_CPU_SHARES_INVALID
;
706 static uint64_t cgroup_context_cpu_weight(CGroupContext
*c
, ManagerState state
) {
707 if (IN_SET(state
, MANAGER_STARTING
, MANAGER_INITIALIZING
) &&
708 c
->startup_cpu_weight
!= CGROUP_WEIGHT_INVALID
)
709 return c
->startup_cpu_weight
;
710 else if (c
->cpu_weight
!= CGROUP_WEIGHT_INVALID
)
711 return c
->cpu_weight
;
713 return CGROUP_WEIGHT_DEFAULT
;
716 static uint64_t cgroup_context_cpu_shares(CGroupContext
*c
, ManagerState state
) {
717 if (IN_SET(state
, MANAGER_STARTING
, MANAGER_INITIALIZING
) &&
718 c
->startup_cpu_shares
!= CGROUP_CPU_SHARES_INVALID
)
719 return c
->startup_cpu_shares
;
720 else if (c
->cpu_shares
!= CGROUP_CPU_SHARES_INVALID
)
721 return c
->cpu_shares
;
723 return CGROUP_CPU_SHARES_DEFAULT
;
726 usec_t
cgroup_cpu_adjust_period(usec_t period
, usec_t quota
, usec_t resolution
, usec_t max_period
) {
727 /* kernel uses a minimum resolution of 1ms, so both period and (quota * period)
728 * need to be higher than that boundary. quota is specified in USecPerSec.
729 * Additionally, period must be at most max_period. */
732 return MIN(MAX3(period
, resolution
, resolution
* USEC_PER_SEC
/ quota
), max_period
);
735 static usec_t
cgroup_cpu_adjust_period_and_log(Unit
*u
, usec_t period
, usec_t quota
) {
738 if (quota
== USEC_INFINITY
)
739 /* Always use default period for infinity quota. */
740 return CGROUP_CPU_QUOTA_DEFAULT_PERIOD_USEC
;
742 if (period
== USEC_INFINITY
)
743 /* Default period was requested. */
744 period
= CGROUP_CPU_QUOTA_DEFAULT_PERIOD_USEC
;
746 /* Clamp to interval [1ms, 1s] */
747 new_period
= cgroup_cpu_adjust_period(period
, quota
, USEC_PER_MSEC
, USEC_PER_SEC
);
749 if (new_period
!= period
) {
750 char v
[FORMAT_TIMESPAN_MAX
];
751 log_unit_full(u
, u
->warned_clamping_cpu_quota_period
? LOG_DEBUG
: LOG_WARNING
, 0,
752 "Clamping CPU interval for cpu.max: period is now %s",
753 format_timespan(v
, sizeof(v
), new_period
, 1));
754 u
->warned_clamping_cpu_quota_period
= true;
760 static void cgroup_apply_unified_cpu_weight(Unit
*u
, uint64_t weight
) {
761 char buf
[DECIMAL_STR_MAX(uint64_t) + 2];
763 xsprintf(buf
, "%" PRIu64
"\n", weight
);
764 (void) set_attribute_and_warn(u
, "cpu", "cpu.weight", buf
);
767 static void cgroup_apply_unified_cpu_quota(Unit
*u
, usec_t quota
, usec_t period
) {
768 char buf
[(DECIMAL_STR_MAX(usec_t
) + 1) * 2 + 1];
770 period
= cgroup_cpu_adjust_period_and_log(u
, period
, quota
);
771 if (quota
!= USEC_INFINITY
)
772 xsprintf(buf
, USEC_FMT
" " USEC_FMT
"\n",
773 MAX(quota
* period
/ USEC_PER_SEC
, USEC_PER_MSEC
), period
);
775 xsprintf(buf
, "max " USEC_FMT
"\n", period
);
776 (void) set_attribute_and_warn(u
, "cpu", "cpu.max", buf
);
779 static void cgroup_apply_legacy_cpu_shares(Unit
*u
, uint64_t shares
) {
780 char buf
[DECIMAL_STR_MAX(uint64_t) + 2];
782 xsprintf(buf
, "%" PRIu64
"\n", shares
);
783 (void) set_attribute_and_warn(u
, "cpu", "cpu.shares", buf
);
786 static void cgroup_apply_legacy_cpu_quota(Unit
*u
, usec_t quota
, usec_t period
) {
787 char buf
[DECIMAL_STR_MAX(usec_t
) + 2];
789 period
= cgroup_cpu_adjust_period_and_log(u
, period
, quota
);
791 xsprintf(buf
, USEC_FMT
"\n", period
);
792 (void) set_attribute_and_warn(u
, "cpu", "cpu.cfs_period_us", buf
);
794 if (quota
!= USEC_INFINITY
) {
795 xsprintf(buf
, USEC_FMT
"\n", MAX(quota
* period
/ USEC_PER_SEC
, USEC_PER_MSEC
));
796 (void) set_attribute_and_warn(u
, "cpu", "cpu.cfs_quota_us", buf
);
798 (void) set_attribute_and_warn(u
, "cpu", "cpu.cfs_quota_us", "-1\n");
801 static uint64_t cgroup_cpu_shares_to_weight(uint64_t shares
) {
802 return CLAMP(shares
* CGROUP_WEIGHT_DEFAULT
/ CGROUP_CPU_SHARES_DEFAULT
,
803 CGROUP_WEIGHT_MIN
, CGROUP_WEIGHT_MAX
);
806 static uint64_t cgroup_cpu_weight_to_shares(uint64_t weight
) {
807 return CLAMP(weight
* CGROUP_CPU_SHARES_DEFAULT
/ CGROUP_WEIGHT_DEFAULT
,
808 CGROUP_CPU_SHARES_MIN
, CGROUP_CPU_SHARES_MAX
);
811 static void cgroup_apply_unified_cpuset(Unit
*u
, CPUSet cpus
, const char *name
) {
812 _cleanup_free_
char *buf
= NULL
;
814 buf
= cpu_set_to_range_string(&cpus
);
818 (void) set_attribute_and_warn(u
, "cpuset", name
, buf
);
821 static bool cgroup_context_has_io_config(CGroupContext
*c
) {
822 return c
->io_accounting
||
823 c
->io_weight
!= CGROUP_WEIGHT_INVALID
||
824 c
->startup_io_weight
!= CGROUP_WEIGHT_INVALID
||
825 c
->io_device_weights
||
826 c
->io_device_latencies
||
830 static bool cgroup_context_has_blockio_config(CGroupContext
*c
) {
831 return c
->blockio_accounting
||
832 c
->blockio_weight
!= CGROUP_BLKIO_WEIGHT_INVALID
||
833 c
->startup_blockio_weight
!= CGROUP_BLKIO_WEIGHT_INVALID
||
834 c
->blockio_device_weights
||
835 c
->blockio_device_bandwidths
;
838 static uint64_t cgroup_context_io_weight(CGroupContext
*c
, ManagerState state
) {
839 if (IN_SET(state
, MANAGER_STARTING
, MANAGER_INITIALIZING
) &&
840 c
->startup_io_weight
!= CGROUP_WEIGHT_INVALID
)
841 return c
->startup_io_weight
;
842 else if (c
->io_weight
!= CGROUP_WEIGHT_INVALID
)
845 return CGROUP_WEIGHT_DEFAULT
;
848 static uint64_t cgroup_context_blkio_weight(CGroupContext
*c
, ManagerState state
) {
849 if (IN_SET(state
, MANAGER_STARTING
, MANAGER_INITIALIZING
) &&
850 c
->startup_blockio_weight
!= CGROUP_BLKIO_WEIGHT_INVALID
)
851 return c
->startup_blockio_weight
;
852 else if (c
->blockio_weight
!= CGROUP_BLKIO_WEIGHT_INVALID
)
853 return c
->blockio_weight
;
855 return CGROUP_BLKIO_WEIGHT_DEFAULT
;
858 static uint64_t cgroup_weight_blkio_to_io(uint64_t blkio_weight
) {
859 return CLAMP(blkio_weight
* CGROUP_WEIGHT_DEFAULT
/ CGROUP_BLKIO_WEIGHT_DEFAULT
,
860 CGROUP_WEIGHT_MIN
, CGROUP_WEIGHT_MAX
);
863 static uint64_t cgroup_weight_io_to_blkio(uint64_t io_weight
) {
864 return CLAMP(io_weight
* CGROUP_BLKIO_WEIGHT_DEFAULT
/ CGROUP_WEIGHT_DEFAULT
,
865 CGROUP_BLKIO_WEIGHT_MIN
, CGROUP_BLKIO_WEIGHT_MAX
);
868 static void cgroup_apply_io_device_weight(Unit
*u
, const char *dev_path
, uint64_t io_weight
) {
869 char buf
[DECIMAL_STR_MAX(dev_t
)*2+2+DECIMAL_STR_MAX(uint64_t)+1];
873 r
= lookup_block_device(dev_path
, &dev
);
877 xsprintf(buf
, "%u:%u %" PRIu64
"\n", major(dev
), minor(dev
), io_weight
);
878 (void) set_attribute_and_warn(u
, "io", "io.weight", buf
);
881 static void cgroup_apply_blkio_device_weight(Unit
*u
, const char *dev_path
, uint64_t blkio_weight
) {
882 char buf
[DECIMAL_STR_MAX(dev_t
)*2+2+DECIMAL_STR_MAX(uint64_t)+1];
886 r
= lookup_block_device(dev_path
, &dev
);
890 xsprintf(buf
, "%u:%u %" PRIu64
"\n", major(dev
), minor(dev
), blkio_weight
);
891 (void) set_attribute_and_warn(u
, "blkio", "blkio.weight_device", buf
);
894 static void cgroup_apply_io_device_latency(Unit
*u
, const char *dev_path
, usec_t target
) {
895 char buf
[DECIMAL_STR_MAX(dev_t
)*2+2+7+DECIMAL_STR_MAX(uint64_t)+1];
899 r
= lookup_block_device(dev_path
, &dev
);
903 if (target
!= USEC_INFINITY
)
904 xsprintf(buf
, "%u:%u target=%" PRIu64
"\n", major(dev
), minor(dev
), target
);
906 xsprintf(buf
, "%u:%u target=max\n", major(dev
), minor(dev
));
908 (void) set_attribute_and_warn(u
, "io", "io.latency", buf
);
911 static void cgroup_apply_io_device_limit(Unit
*u
, const char *dev_path
, uint64_t *limits
) {
912 char limit_bufs
[_CGROUP_IO_LIMIT_TYPE_MAX
][DECIMAL_STR_MAX(uint64_t)];
913 char buf
[DECIMAL_STR_MAX(dev_t
)*2+2+(6+DECIMAL_STR_MAX(uint64_t)+1)*4];
914 CGroupIOLimitType type
;
918 r
= lookup_block_device(dev_path
, &dev
);
922 for (type
= 0; type
< _CGROUP_IO_LIMIT_TYPE_MAX
; type
++)
923 if (limits
[type
] != cgroup_io_limit_defaults
[type
])
924 xsprintf(limit_bufs
[type
], "%" PRIu64
, limits
[type
]);
926 xsprintf(limit_bufs
[type
], "%s", limits
[type
] == CGROUP_LIMIT_MAX
? "max" : "0");
928 xsprintf(buf
, "%u:%u rbps=%s wbps=%s riops=%s wiops=%s\n", major(dev
), minor(dev
),
929 limit_bufs
[CGROUP_IO_RBPS_MAX
], limit_bufs
[CGROUP_IO_WBPS_MAX
],
930 limit_bufs
[CGROUP_IO_RIOPS_MAX
], limit_bufs
[CGROUP_IO_WIOPS_MAX
]);
931 (void) set_attribute_and_warn(u
, "io", "io.max", buf
);
934 static void cgroup_apply_blkio_device_limit(Unit
*u
, const char *dev_path
, uint64_t rbps
, uint64_t wbps
) {
935 char buf
[DECIMAL_STR_MAX(dev_t
)*2+2+DECIMAL_STR_MAX(uint64_t)+1];
939 r
= lookup_block_device(dev_path
, &dev
);
943 sprintf(buf
, "%u:%u %" PRIu64
"\n", major(dev
), minor(dev
), rbps
);
944 (void) set_attribute_and_warn(u
, "blkio", "blkio.throttle.read_bps_device", buf
);
946 sprintf(buf
, "%u:%u %" PRIu64
"\n", major(dev
), minor(dev
), wbps
);
947 (void) set_attribute_and_warn(u
, "blkio", "blkio.throttle.write_bps_device", buf
);
950 static bool unit_has_unified_memory_config(Unit
*u
) {
955 c
= unit_get_cgroup_context(u
);
958 return unit_get_ancestor_memory_min(u
) > 0 || unit_get_ancestor_memory_low(u
) > 0 ||
959 c
->memory_high
!= CGROUP_LIMIT_MAX
|| c
->memory_max
!= CGROUP_LIMIT_MAX
||
960 c
->memory_swap_max
!= CGROUP_LIMIT_MAX
;
963 static void cgroup_apply_unified_memory_limit(Unit
*u
, const char *file
, uint64_t v
) {
964 char buf
[DECIMAL_STR_MAX(uint64_t) + 1] = "max\n";
966 if (v
!= CGROUP_LIMIT_MAX
)
967 xsprintf(buf
, "%" PRIu64
"\n", v
);
969 (void) set_attribute_and_warn(u
, "memory", file
, buf
);
972 static void cgroup_apply_firewall(Unit
*u
) {
975 /* Best-effort: let's apply IP firewalling and/or accounting if that's enabled */
977 if (bpf_firewall_compile(u
) < 0)
980 (void) bpf_firewall_load_custom(u
);
981 (void) bpf_firewall_install(u
);
984 static void cgroup_context_apply(
986 CGroupMask apply_mask
,
987 ManagerState state
) {
991 bool is_host_root
, is_local_root
;
996 /* Nothing to do? Exit early! */
1000 /* Some cgroup attributes are not supported on the host root cgroup, hence silently ignore them here. And other
1001 * attributes should only be managed for cgroups further down the tree. */
1002 is_local_root
= unit_has_name(u
, SPECIAL_ROOT_SLICE
);
1003 is_host_root
= unit_has_host_root_cgroup(u
);
1005 assert_se(c
= unit_get_cgroup_context(u
));
1006 assert_se(path
= u
->cgroup_path
);
1008 if (is_local_root
) /* Make sure we don't try to display messages with an empty path. */
1011 /* We generally ignore errors caused by read-only mounted cgroup trees (assuming we are running in a container
1012 * then), and missing cgroups, i.e. EROFS and ENOENT. */
1014 /* In fully unified mode these attributes don't exist on the host cgroup root. On legacy the weights exist, but
1015 * setting the weight makes very little sense on the host root cgroup, as there are no other cgroups at this
1016 * level. The quota exists there too, but any attempt to write to it is refused with EINVAL. Inside of
1017 * containers we want to leave control of these to the container manager (and if cgroup v2 delegation is used
1018 * we couldn't even write to them if we wanted to). */
1019 if ((apply_mask
& CGROUP_MASK_CPU
) && !is_local_root
) {
1021 if (cg_all_unified() > 0) {
1024 if (cgroup_context_has_cpu_weight(c
))
1025 weight
= cgroup_context_cpu_weight(c
, state
);
1026 else if (cgroup_context_has_cpu_shares(c
)) {
1029 shares
= cgroup_context_cpu_shares(c
, state
);
1030 weight
= cgroup_cpu_shares_to_weight(shares
);
1032 log_cgroup_compat(u
, "Applying [Startup]CPUShares=%" PRIu64
" as [Startup]CPUWeight=%" PRIu64
" on %s",
1033 shares
, weight
, path
);
1035 weight
= CGROUP_WEIGHT_DEFAULT
;
1037 cgroup_apply_unified_cpu_weight(u
, weight
);
1038 cgroup_apply_unified_cpu_quota(u
, c
->cpu_quota_per_sec_usec
, c
->cpu_quota_period_usec
);
1043 if (cgroup_context_has_cpu_weight(c
)) {
1046 weight
= cgroup_context_cpu_weight(c
, state
);
1047 shares
= cgroup_cpu_weight_to_shares(weight
);
1049 log_cgroup_compat(u
, "Applying [Startup]CPUWeight=%" PRIu64
" as [Startup]CPUShares=%" PRIu64
" on %s",
1050 weight
, shares
, path
);
1051 } else if (cgroup_context_has_cpu_shares(c
))
1052 shares
= cgroup_context_cpu_shares(c
, state
);
1054 shares
= CGROUP_CPU_SHARES_DEFAULT
;
1056 cgroup_apply_legacy_cpu_shares(u
, shares
);
1057 cgroup_apply_legacy_cpu_quota(u
, c
->cpu_quota_per_sec_usec
, c
->cpu_quota_period_usec
);
1061 if ((apply_mask
& CGROUP_MASK_CPUSET
) && !is_local_root
) {
1062 cgroup_apply_unified_cpuset(u
, c
->cpuset_cpus
, "cpuset.cpus");
1063 cgroup_apply_unified_cpuset(u
, c
->cpuset_mems
, "cpuset.mems");
1066 /* The 'io' controller attributes are not exported on the host's root cgroup (being a pure cgroup v2
1067 * controller), and in case of containers we want to leave control of these attributes to the container manager
1068 * (and we couldn't access that stuff anyway, even if we tried if proper delegation is used). */
1069 if ((apply_mask
& CGROUP_MASK_IO
) && !is_local_root
) {
1070 char buf
[8+DECIMAL_STR_MAX(uint64_t)+1];
1071 bool has_io
, has_blockio
;
1074 has_io
= cgroup_context_has_io_config(c
);
1075 has_blockio
= cgroup_context_has_blockio_config(c
);
1078 weight
= cgroup_context_io_weight(c
, state
);
1079 else if (has_blockio
) {
1080 uint64_t blkio_weight
;
1082 blkio_weight
= cgroup_context_blkio_weight(c
, state
);
1083 weight
= cgroup_weight_blkio_to_io(blkio_weight
);
1085 log_cgroup_compat(u
, "Applying [Startup]BlockIOWeight=%" PRIu64
" as [Startup]IOWeight=%" PRIu64
,
1086 blkio_weight
, weight
);
1088 weight
= CGROUP_WEIGHT_DEFAULT
;
1090 xsprintf(buf
, "default %" PRIu64
"\n", weight
);
1091 (void) set_attribute_and_warn(u
, "io", "io.weight", buf
);
1093 /* FIXME: drop this when distro kernels properly support BFQ through "io.weight"
1094 * See also: https://github.com/systemd/systemd/pull/13335 */
1095 xsprintf(buf
, "%" PRIu64
"\n", weight
);
1096 (void) set_attribute_and_warn(u
, "io", "io.bfq.weight", buf
);
1099 CGroupIODeviceLatency
*latency
;
1100 CGroupIODeviceLimit
*limit
;
1101 CGroupIODeviceWeight
*w
;
1103 LIST_FOREACH(device_weights
, w
, c
->io_device_weights
)
1104 cgroup_apply_io_device_weight(u
, w
->path
, w
->weight
);
1106 LIST_FOREACH(device_limits
, limit
, c
->io_device_limits
)
1107 cgroup_apply_io_device_limit(u
, limit
->path
, limit
->limits
);
1109 LIST_FOREACH(device_latencies
, latency
, c
->io_device_latencies
)
1110 cgroup_apply_io_device_latency(u
, latency
->path
, latency
->target_usec
);
1112 } else if (has_blockio
) {
1113 CGroupBlockIODeviceWeight
*w
;
1114 CGroupBlockIODeviceBandwidth
*b
;
1116 LIST_FOREACH(device_weights
, w
, c
->blockio_device_weights
) {
1117 weight
= cgroup_weight_blkio_to_io(w
->weight
);
1119 log_cgroup_compat(u
, "Applying BlockIODeviceWeight=%" PRIu64
" as IODeviceWeight=%" PRIu64
" for %s",
1120 w
->weight
, weight
, w
->path
);
1122 cgroup_apply_io_device_weight(u
, w
->path
, weight
);
1125 LIST_FOREACH(device_bandwidths
, b
, c
->blockio_device_bandwidths
) {
1126 uint64_t limits
[_CGROUP_IO_LIMIT_TYPE_MAX
];
1127 CGroupIOLimitType type
;
1129 for (type
= 0; type
< _CGROUP_IO_LIMIT_TYPE_MAX
; type
++)
1130 limits
[type
] = cgroup_io_limit_defaults
[type
];
1132 limits
[CGROUP_IO_RBPS_MAX
] = b
->rbps
;
1133 limits
[CGROUP_IO_WBPS_MAX
] = b
->wbps
;
1135 log_cgroup_compat(u
, "Applying BlockIO{Read|Write}Bandwidth=%" PRIu64
" %" PRIu64
" as IO{Read|Write}BandwidthMax= for %s",
1136 b
->rbps
, b
->wbps
, b
->path
);
1138 cgroup_apply_io_device_limit(u
, b
->path
, limits
);
1143 if (apply_mask
& CGROUP_MASK_BLKIO
) {
1144 bool has_io
, has_blockio
;
1146 has_io
= cgroup_context_has_io_config(c
);
1147 has_blockio
= cgroup_context_has_blockio_config(c
);
1149 /* Applying a 'weight' never makes sense for the host root cgroup, and for containers this should be
1150 * left to our container manager, too. */
1151 if (!is_local_root
) {
1152 char buf
[DECIMAL_STR_MAX(uint64_t)+1];
1158 io_weight
= cgroup_context_io_weight(c
, state
);
1159 weight
= cgroup_weight_io_to_blkio(cgroup_context_io_weight(c
, state
));
1161 log_cgroup_compat(u
, "Applying [Startup]IOWeight=%" PRIu64
" as [Startup]BlockIOWeight=%" PRIu64
,
1163 } else if (has_blockio
)
1164 weight
= cgroup_context_blkio_weight(c
, state
);
1166 weight
= CGROUP_BLKIO_WEIGHT_DEFAULT
;
1168 xsprintf(buf
, "%" PRIu64
"\n", weight
);
1169 (void) set_attribute_and_warn(u
, "blkio", "blkio.weight", buf
);
1172 CGroupIODeviceWeight
*w
;
1174 LIST_FOREACH(device_weights
, w
, c
->io_device_weights
) {
1175 weight
= cgroup_weight_io_to_blkio(w
->weight
);
1177 log_cgroup_compat(u
, "Applying IODeviceWeight=%" PRIu64
" as BlockIODeviceWeight=%" PRIu64
" for %s",
1178 w
->weight
, weight
, w
->path
);
1180 cgroup_apply_blkio_device_weight(u
, w
->path
, weight
);
1182 } else if (has_blockio
) {
1183 CGroupBlockIODeviceWeight
*w
;
1185 LIST_FOREACH(device_weights
, w
, c
->blockio_device_weights
)
1186 cgroup_apply_blkio_device_weight(u
, w
->path
, w
->weight
);
1190 /* The bandwidth limits are something that make sense to be applied to the host's root but not container
1191 * roots, as there we want the container manager to handle it */
1192 if (is_host_root
|| !is_local_root
) {
1194 CGroupIODeviceLimit
*l
;
1196 LIST_FOREACH(device_limits
, l
, c
->io_device_limits
) {
1197 log_cgroup_compat(u
, "Applying IO{Read|Write}Bandwidth=%" PRIu64
" %" PRIu64
" as BlockIO{Read|Write}BandwidthMax= for %s",
1198 l
->limits
[CGROUP_IO_RBPS_MAX
], l
->limits
[CGROUP_IO_WBPS_MAX
], l
->path
);
1200 cgroup_apply_blkio_device_limit(u
, l
->path
, l
->limits
[CGROUP_IO_RBPS_MAX
], l
->limits
[CGROUP_IO_WBPS_MAX
]);
1202 } else if (has_blockio
) {
1203 CGroupBlockIODeviceBandwidth
*b
;
1205 LIST_FOREACH(device_bandwidths
, b
, c
->blockio_device_bandwidths
)
1206 cgroup_apply_blkio_device_limit(u
, b
->path
, b
->rbps
, b
->wbps
);
1211 /* In unified mode 'memory' attributes do not exist on the root cgroup. In legacy mode 'memory.limit_in_bytes'
1212 * exists on the root cgroup, but any writes to it are refused with EINVAL. And if we run in a container we
1213 * want to leave control to the container manager (and if proper cgroup v2 delegation is used we couldn't even
1214 * write to this if we wanted to.) */
1215 if ((apply_mask
& CGROUP_MASK_MEMORY
) && !is_local_root
) {
1217 if (cg_all_unified() > 0) {
1218 uint64_t max
, swap_max
= CGROUP_LIMIT_MAX
;
1220 if (unit_has_unified_memory_config(u
)) {
1221 max
= c
->memory_max
;
1222 swap_max
= c
->memory_swap_max
;
1224 max
= c
->memory_limit
;
1226 if (max
!= CGROUP_LIMIT_MAX
)
1227 log_cgroup_compat(u
, "Applying MemoryLimit=%" PRIu64
" as MemoryMax=", max
);
1230 cgroup_apply_unified_memory_limit(u
, "memory.min", c
->memory_min
);
1231 cgroup_apply_unified_memory_limit(u
, "memory.low", unit_get_ancestor_memory_low(u
));
1232 cgroup_apply_unified_memory_limit(u
, "memory.high", c
->memory_high
);
1233 cgroup_apply_unified_memory_limit(u
, "memory.max", max
);
1234 cgroup_apply_unified_memory_limit(u
, "memory.swap.max", swap_max
);
1236 (void) set_attribute_and_warn(u
, "memory", "memory.oom.group", one_zero(c
->memory_oom_group
));
1239 char buf
[DECIMAL_STR_MAX(uint64_t) + 1];
1242 if (unit_has_unified_memory_config(u
)) {
1243 val
= c
->memory_max
;
1244 log_cgroup_compat(u
, "Applying MemoryMax=%" PRIi64
" as MemoryLimit=", val
);
1246 val
= c
->memory_limit
;
1248 if (val
== CGROUP_LIMIT_MAX
)
1249 strncpy(buf
, "-1\n", sizeof(buf
));
1251 xsprintf(buf
, "%" PRIu64
"\n", val
);
1253 (void) set_attribute_and_warn(u
, "memory", "memory.limit_in_bytes", buf
);
1257 /* On cgroup v2 we can apply BPF everywhere. On cgroup v1 we apply it everywhere except for the root of
1258 * containers, where we leave this to the manager */
1259 if ((apply_mask
& (CGROUP_MASK_DEVICES
| CGROUP_MASK_BPF_DEVICES
)) &&
1260 (is_host_root
|| cg_all_unified() > 0 || !is_local_root
)) {
1261 _cleanup_(bpf_program_unrefp
) BPFProgram
*prog
= NULL
;
1262 CGroupDeviceAllow
*a
;
1264 if (cg_all_unified() > 0) {
1265 r
= cgroup_init_device_bpf(&prog
, c
->device_policy
, c
->device_allow
);
1267 log_unit_warning_errno(u
, r
, "Failed to initialize device control bpf program: %m");
1269 /* Changing the devices list of a populated cgroup might result in EINVAL, hence ignore EINVAL
1272 if (c
->device_allow
|| c
->device_policy
!= CGROUP_AUTO
)
1273 r
= cg_set_attribute("devices", path
, "devices.deny", "a");
1275 r
= cg_set_attribute("devices", path
, "devices.allow", "a");
1277 log_unit_full(u
, IN_SET(r
, -ENOENT
, -EROFS
, -EINVAL
, -EACCES
, -EPERM
) ? LOG_DEBUG
: LOG_WARNING
, r
,
1278 "Failed to reset devices.allow/devices.deny: %m");
1281 if (c
->device_policy
== CGROUP_CLOSED
||
1282 (c
->device_policy
== CGROUP_AUTO
&& c
->device_allow
)) {
1283 static const char auto_devices
[] =
1284 "/dev/null\0" "rwm\0"
1285 "/dev/zero\0" "rwm\0"
1286 "/dev/full\0" "rwm\0"
1287 "/dev/random\0" "rwm\0"
1288 "/dev/urandom\0" "rwm\0"
1289 "/dev/tty\0" "rwm\0"
1290 "/dev/ptmx\0" "rwm\0"
1291 /* Allow /run/systemd/inaccessible/{chr,blk} devices for mapping InaccessiblePaths */
1292 "/run/systemd/inaccessible/chr\0" "rwm\0"
1293 "/run/systemd/inaccessible/blk\0" "rwm\0";
1297 NULSTR_FOREACH_PAIR(x
, y
, auto_devices
)
1298 (void) whitelist_device(prog
, path
, x
, y
);
1300 /* PTS (/dev/pts) devices may not be duplicated, but accessed */
1301 (void) whitelist_major(prog
, path
, "pts", 'c', "rw");
1304 LIST_FOREACH(device_allow
, a
, c
->device_allow
) {
1320 if (path_startswith(a
->path
, "/dev/"))
1321 (void) whitelist_device(prog
, path
, a
->path
, acc
);
1322 else if ((val
= startswith(a
->path
, "block-")))
1323 (void) whitelist_major(prog
, path
, val
, 'b', acc
);
1324 else if ((val
= startswith(a
->path
, "char-")))
1325 (void) whitelist_major(prog
, path
, val
, 'c', acc
);
1327 log_unit_debug(u
, "Ignoring device '%s' while writing cgroup attribute.", a
->path
);
1330 r
= cgroup_apply_device_bpf(u
, prog
, c
->device_policy
, c
->device_allow
);
1332 static bool warned
= false;
1334 log_full_errno(warned
? LOG_DEBUG
: LOG_WARNING
, r
,
1335 "Unit %s configures device ACL, but the local system doesn't seem to support the BPF-based device controller.\n"
1336 "Proceeding WITHOUT applying ACL (all devices will be accessible)!\n"
1337 "(This warning is only shown for the first loaded unit using device ACL.)", u
->id
);
1343 if (apply_mask
& CGROUP_MASK_PIDS
) {
1346 /* So, the "pids" controller does not expose anything on the root cgroup, in order not to
1347 * replicate knobs exposed elsewhere needlessly. We abstract this away here however, and when
1348 * the knobs of the root cgroup are modified propagate this to the relevant sysctls. There's a
1349 * non-obvious asymmetry however: unlike the cgroup properties we don't really want to take
1350 * exclusive ownership of the sysctls, but we still want to honour things if the user sets
1351 * limits. Hence we employ sort of a one-way strategy: when the user sets a bounded limit
1352 * through us it counts. When the user afterwards unsets it again (i.e. sets it to unbounded)
1353 * it also counts. But if the user never set a limit through us (i.e. we are the default of
1354 * "unbounded") we leave things unmodified. For this we manage a global boolean that we turn on
1355 * the first time we set a limit. Note that this boolean is flushed out on manager reload,
1356 * which is desirable so that there's an official way to release control of the sysctl from
1357 * systemd: set the limit to unbounded and reload. */
1359 if (c
->tasks_max
!= CGROUP_LIMIT_MAX
) {
1360 u
->manager
->sysctl_pid_max_changed
= true;
1361 r
= procfs_tasks_set_limit(c
->tasks_max
);
1362 } else if (u
->manager
->sysctl_pid_max_changed
)
1363 r
= procfs_tasks_set_limit(TASKS_MAX
);
1367 log_unit_full(u
, LOG_LEVEL_CGROUP_WRITE(r
), r
,
1368 "Failed to write to tasks limit sysctls: %m");
1371 /* The attribute itself is not available on the host root cgroup, and in the container case we want to
1372 * leave it for the container manager. */
1373 if (!is_local_root
) {
1374 if (c
->tasks_max
!= CGROUP_LIMIT_MAX
) {
1375 char buf
[DECIMAL_STR_MAX(uint64_t) + 2];
1377 sprintf(buf
, "%" PRIu64
"\n", c
->tasks_max
);
1378 (void) set_attribute_and_warn(u
, "pids", "pids.max", buf
);
1380 (void) set_attribute_and_warn(u
, "pids", "pids.max", "max\n");
1384 if (apply_mask
& CGROUP_MASK_BPF_FIREWALL
)
1385 cgroup_apply_firewall(u
);
1388 static bool unit_get_needs_bpf_firewall(Unit
*u
) {
1393 c
= unit_get_cgroup_context(u
);
1397 if (c
->ip_accounting
||
1398 c
->ip_address_allow
||
1399 c
->ip_address_deny
||
1400 c
->ip_filters_ingress
||
1401 c
->ip_filters_egress
)
1404 /* If any parent slice has an IP access list defined, it applies too */
1405 for (p
= UNIT_DEREF(u
->slice
); p
; p
= UNIT_DEREF(p
->slice
)) {
1406 c
= unit_get_cgroup_context(p
);
1410 if (c
->ip_address_allow
||
1418 static CGroupMask
unit_get_cgroup_mask(Unit
*u
) {
1419 CGroupMask mask
= 0;
1424 c
= unit_get_cgroup_context(u
);
1428 /* Figure out which controllers we need, based on the cgroup context object */
1430 if (c
->cpu_accounting
)
1431 mask
|= get_cpu_accounting_mask();
1433 if (cgroup_context_has_cpu_weight(c
) ||
1434 cgroup_context_has_cpu_shares(c
) ||
1435 c
->cpu_quota_per_sec_usec
!= USEC_INFINITY
)
1436 mask
|= CGROUP_MASK_CPU
;
1438 if (c
->cpuset_cpus
.set
|| c
->cpuset_mems
.set
)
1439 mask
|= CGROUP_MASK_CPUSET
;
1441 if (cgroup_context_has_io_config(c
) || cgroup_context_has_blockio_config(c
))
1442 mask
|= CGROUP_MASK_IO
| CGROUP_MASK_BLKIO
;
1444 if (c
->memory_accounting
||
1445 c
->memory_limit
!= CGROUP_LIMIT_MAX
||
1446 unit_has_unified_memory_config(u
))
1447 mask
|= CGROUP_MASK_MEMORY
;
1449 if (c
->device_allow
||
1450 c
->device_policy
!= CGROUP_AUTO
)
1451 mask
|= CGROUP_MASK_DEVICES
| CGROUP_MASK_BPF_DEVICES
;
1453 if (c
->tasks_accounting
||
1454 c
->tasks_max
!= CGROUP_LIMIT_MAX
)
1455 mask
|= CGROUP_MASK_PIDS
;
1457 return CGROUP_MASK_EXTEND_JOINED(mask
);
1460 static CGroupMask
unit_get_bpf_mask(Unit
*u
) {
1461 CGroupMask mask
= 0;
1463 /* Figure out which controllers we need, based on the cgroup context, possibly taking into account children
1466 if (unit_get_needs_bpf_firewall(u
))
1467 mask
|= CGROUP_MASK_BPF_FIREWALL
;
1472 CGroupMask
unit_get_own_mask(Unit
*u
) {
1475 /* Returns the mask of controllers the unit needs for itself. If a unit is not properly loaded, return an empty
1476 * mask, as we shouldn't reflect it in the cgroup hierarchy then. */
1478 if (u
->load_state
!= UNIT_LOADED
)
1481 c
= unit_get_cgroup_context(u
);
1485 return (unit_get_cgroup_mask(u
) | unit_get_bpf_mask(u
) | unit_get_delegate_mask(u
)) & ~unit_get_ancestor_disable_mask(u
);
1488 CGroupMask
unit_get_delegate_mask(Unit
*u
) {
1491 /* If delegation is turned on, then turn on selected controllers, unless we are on the legacy hierarchy and the
1492 * process we fork into is known to drop privileges, and hence shouldn't get access to the controllers.
1494 * Note that on the unified hierarchy it is safe to delegate controllers to unprivileged services. */
1496 if (!unit_cgroup_delegate(u
))
1499 if (cg_all_unified() <= 0) {
1502 e
= unit_get_exec_context(u
);
1503 if (e
&& !exec_context_maintains_privileges(e
))
1507 assert_se(c
= unit_get_cgroup_context(u
));
1508 return CGROUP_MASK_EXTEND_JOINED(c
->delegate_controllers
);
1511 CGroupMask
unit_get_members_mask(Unit
*u
) {
1514 /* Returns the mask of controllers all of the unit's children require, merged */
1516 if (u
->cgroup_members_mask_valid
)
1517 return u
->cgroup_members_mask
; /* Use cached value if possible */
1519 u
->cgroup_members_mask
= 0;
1521 if (u
->type
== UNIT_SLICE
) {
1526 HASHMAP_FOREACH_KEY(v
, member
, u
->dependencies
[UNIT_BEFORE
], i
) {
1527 if (UNIT_DEREF(member
->slice
) == u
)
1528 u
->cgroup_members_mask
|= unit_get_subtree_mask(member
); /* note that this calls ourselves again, for the children */
1532 u
->cgroup_members_mask_valid
= true;
1533 return u
->cgroup_members_mask
;
1536 CGroupMask
unit_get_siblings_mask(Unit
*u
) {
1539 /* Returns the mask of controllers all of the unit's siblings
1540 * require, i.e. the members mask of the unit's parent slice
1541 * if there is one. */
1543 if (UNIT_ISSET(u
->slice
))
1544 return unit_get_members_mask(UNIT_DEREF(u
->slice
));
1546 return unit_get_subtree_mask(u
); /* we are the top-level slice */
1549 CGroupMask
unit_get_disable_mask(Unit
*u
) {
1552 c
= unit_get_cgroup_context(u
);
1556 return c
->disable_controllers
;
1559 CGroupMask
unit_get_ancestor_disable_mask(Unit
*u
) {
1563 mask
= unit_get_disable_mask(u
);
1565 /* Returns the mask of controllers which are marked as forcibly
1566 * disabled in any ancestor unit or the unit in question. */
1568 if (UNIT_ISSET(u
->slice
))
1569 mask
|= unit_get_ancestor_disable_mask(UNIT_DEREF(u
->slice
));
1574 CGroupMask
unit_get_subtree_mask(Unit
*u
) {
1576 /* Returns the mask of this subtree, meaning of the group
1577 * itself and its children. */
1579 return unit_get_own_mask(u
) | unit_get_members_mask(u
);
1582 CGroupMask
unit_get_target_mask(Unit
*u
) {
1585 /* This returns the cgroup mask of all controllers to enable
1586 * for a specific cgroup, i.e. everything it needs itself,
1587 * plus all that its children need, plus all that its siblings
1588 * need. This is primarily useful on the legacy cgroup
1589 * hierarchy, where we need to duplicate each cgroup in each
1590 * hierarchy that shall be enabled for it. */
1592 mask
= unit_get_own_mask(u
) | unit_get_members_mask(u
) | unit_get_siblings_mask(u
);
1594 if (mask
& CGROUP_MASK_BPF_FIREWALL
& ~u
->manager
->cgroup_supported
)
1595 emit_bpf_firewall_warning(u
);
1597 mask
&= u
->manager
->cgroup_supported
;
1598 mask
&= ~unit_get_ancestor_disable_mask(u
);
1603 CGroupMask
unit_get_enable_mask(Unit
*u
) {
1606 /* This returns the cgroup mask of all controllers to enable
1607 * for the children of a specific cgroup. This is primarily
1608 * useful for the unified cgroup hierarchy, where each cgroup
1609 * controls which controllers are enabled for its children. */
1611 mask
= unit_get_members_mask(u
);
1612 mask
&= u
->manager
->cgroup_supported
;
1613 mask
&= ~unit_get_ancestor_disable_mask(u
);
1618 void unit_invalidate_cgroup_members_masks(Unit
*u
) {
1621 /* Recurse invalidate the member masks cache all the way up the tree */
1622 u
->cgroup_members_mask_valid
= false;
1624 if (UNIT_ISSET(u
->slice
))
1625 unit_invalidate_cgroup_members_masks(UNIT_DEREF(u
->slice
));
1628 const char *unit_get_realized_cgroup_path(Unit
*u
, CGroupMask mask
) {
1630 /* Returns the realized cgroup path of the specified unit where all specified controllers are available. */
1634 if (u
->cgroup_path
&&
1635 u
->cgroup_realized
&&
1636 FLAGS_SET(u
->cgroup_realized_mask
, mask
))
1637 return u
->cgroup_path
;
1639 u
= UNIT_DEREF(u
->slice
);
1645 static const char *migrate_callback(CGroupMask mask
, void *userdata
) {
1646 return unit_get_realized_cgroup_path(userdata
, mask
);
1649 char *unit_default_cgroup_path(const Unit
*u
) {
1650 _cleanup_free_
char *escaped
= NULL
, *slice
= NULL
;
1655 if (unit_has_name(u
, SPECIAL_ROOT_SLICE
))
1656 return strdup(u
->manager
->cgroup_root
);
1658 if (UNIT_ISSET(u
->slice
) && !unit_has_name(UNIT_DEREF(u
->slice
), SPECIAL_ROOT_SLICE
)) {
1659 r
= cg_slice_to_path(UNIT_DEREF(u
->slice
)->id
, &slice
);
1664 escaped
= cg_escape(u
->id
);
1668 return path_join(empty_to_root(u
->manager
->cgroup_root
), slice
, escaped
);
1671 int unit_set_cgroup_path(Unit
*u
, const char *path
) {
1672 _cleanup_free_
char *p
= NULL
;
1677 if (streq_ptr(u
->cgroup_path
, path
))
1687 r
= hashmap_put(u
->manager
->cgroup_unit
, p
, u
);
1692 unit_release_cgroup(u
);
1693 u
->cgroup_path
= TAKE_PTR(p
);
1698 int unit_watch_cgroup(Unit
*u
) {
1699 _cleanup_free_
char *events
= NULL
;
1704 /* Watches the "cgroups.events" attribute of this unit's cgroup for "empty" events, but only if
1705 * cgroupv2 is available. */
1707 if (!u
->cgroup_path
)
1710 if (u
->cgroup_control_inotify_wd
>= 0)
1713 /* Only applies to the unified hierarchy */
1714 r
= cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER
);
1716 return log_error_errno(r
, "Failed to determine whether the name=systemd hierarchy is unified: %m");
1720 /* No point in watch the top-level slice, it's never going to run empty. */
1721 if (unit_has_name(u
, SPECIAL_ROOT_SLICE
))
1724 r
= hashmap_ensure_allocated(&u
->manager
->cgroup_control_inotify_wd_unit
, &trivial_hash_ops
);
1728 r
= cg_get_path(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, "cgroup.events", &events
);
1732 u
->cgroup_control_inotify_wd
= inotify_add_watch(u
->manager
->cgroup_inotify_fd
, events
, IN_MODIFY
);
1733 if (u
->cgroup_control_inotify_wd
< 0) {
1735 if (errno
== ENOENT
) /* If the directory is already gone we don't need to track it, so this
1736 * is not an error */
1739 return log_unit_error_errno(u
, errno
, "Failed to add control inotify watch descriptor for control group %s: %m", u
->cgroup_path
);
1742 r
= hashmap_put(u
->manager
->cgroup_control_inotify_wd_unit
, INT_TO_PTR(u
->cgroup_control_inotify_wd
), u
);
1744 return log_unit_error_errno(u
, r
, "Failed to add control inotify watch descriptor to hash map: %m");
1749 int unit_watch_cgroup_memory(Unit
*u
) {
1750 _cleanup_free_
char *events
= NULL
;
1756 /* Watches the "memory.events" attribute of this unit's cgroup for "oom_kill" events, but only if
1757 * cgroupv2 is available. */
1759 if (!u
->cgroup_path
)
1762 c
= unit_get_cgroup_context(u
);
1766 /* The "memory.events" attribute is only available if the memory controller is on. Let's hence tie
1767 * this to memory accounting, in a way watching for OOM kills is a form of memory accounting after
1769 if (!c
->memory_accounting
)
1772 /* Don't watch inner nodes, as the kernel doesn't report oom_kill events recursively currently, and
1773 * we also don't want to generate a log message for each parent cgroup of a process. */
1774 if (u
->type
== UNIT_SLICE
)
1777 if (u
->cgroup_memory_inotify_wd
>= 0)
1780 /* Only applies to the unified hierarchy */
1781 r
= cg_all_unified();
1783 return log_error_errno(r
, "Failed to determine whether the memory controller is unified: %m");
1787 r
= hashmap_ensure_allocated(&u
->manager
->cgroup_memory_inotify_wd_unit
, &trivial_hash_ops
);
1791 r
= cg_get_path(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, "memory.events", &events
);
1795 u
->cgroup_memory_inotify_wd
= inotify_add_watch(u
->manager
->cgroup_inotify_fd
, events
, IN_MODIFY
);
1796 if (u
->cgroup_memory_inotify_wd
< 0) {
1798 if (errno
== ENOENT
) /* If the directory is already gone we don't need to track it, so this
1799 * is not an error */
1802 return log_unit_error_errno(u
, errno
, "Failed to add memory inotify watch descriptor for control group %s: %m", u
->cgroup_path
);
1805 r
= hashmap_put(u
->manager
->cgroup_memory_inotify_wd_unit
, INT_TO_PTR(u
->cgroup_memory_inotify_wd
), u
);
1807 return log_unit_error_errno(u
, r
, "Failed to add memory inotify watch descriptor to hash map: %m");
1812 int unit_pick_cgroup_path(Unit
*u
) {
1813 _cleanup_free_
char *path
= NULL
;
1821 if (!UNIT_HAS_CGROUP_CONTEXT(u
))
1824 path
= unit_default_cgroup_path(u
);
1828 r
= unit_set_cgroup_path(u
, path
);
1830 return log_unit_error_errno(u
, r
, "Control group %s exists already.", path
);
1832 return log_unit_error_errno(u
, r
, "Failed to set unit's control group path to %s: %m", path
);
1837 static int unit_create_cgroup(
1839 CGroupMask target_mask
,
1840 CGroupMask enable_mask
,
1841 ManagerState state
) {
1848 if (!UNIT_HAS_CGROUP_CONTEXT(u
))
1851 /* Figure out our cgroup path */
1852 r
= unit_pick_cgroup_path(u
);
1856 /* First, create our own group */
1857 r
= cg_create_everywhere(u
->manager
->cgroup_supported
, target_mask
, u
->cgroup_path
);
1859 return log_unit_error_errno(u
, r
, "Failed to create cgroup %s: %m", u
->cgroup_path
);
1862 /* Start watching it */
1863 (void) unit_watch_cgroup(u
);
1864 (void) unit_watch_cgroup_memory(u
);
1866 /* Preserve enabled controllers in delegated units, adjust others. */
1867 if (created
|| !u
->cgroup_realized
|| !unit_cgroup_delegate(u
)) {
1868 CGroupMask result_mask
= 0;
1870 /* Enable all controllers we need */
1871 r
= cg_enable_everywhere(u
->manager
->cgroup_supported
, enable_mask
, u
->cgroup_path
, &result_mask
);
1873 log_unit_warning_errno(u
, r
, "Failed to enable/disable controllers on cgroup %s, ignoring: %m", u
->cgroup_path
);
1875 /* If we just turned off a controller, this might release the controller for our parent too, let's
1876 * enqueue the parent for re-realization in that case again. */
1877 if (UNIT_ISSET(u
->slice
)) {
1878 CGroupMask turned_off
;
1880 turned_off
= (u
->cgroup_realized
? u
->cgroup_enabled_mask
& ~result_mask
: 0);
1881 if (turned_off
!= 0) {
1884 /* Force the parent to propagate the enable mask to the kernel again, by invalidating
1885 * the controller we just turned off. */
1887 for (parent
= UNIT_DEREF(u
->slice
); parent
; parent
= UNIT_DEREF(parent
->slice
))
1888 unit_invalidate_cgroup(parent
, turned_off
);
1892 /* Remember what's actually enabled now */
1893 u
->cgroup_enabled_mask
= result_mask
;
1896 /* Keep track that this is now realized */
1897 u
->cgroup_realized
= true;
1898 u
->cgroup_realized_mask
= target_mask
;
1900 if (u
->type
!= UNIT_SLICE
&& !unit_cgroup_delegate(u
)) {
1902 /* Then, possibly move things over, but not if
1903 * subgroups may contain processes, which is the case
1904 * for slice and delegation units. */
1905 r
= cg_migrate_everywhere(u
->manager
->cgroup_supported
, u
->cgroup_path
, u
->cgroup_path
, migrate_callback
, u
);
1907 log_unit_warning_errno(u
, r
, "Failed to migrate cgroup from to %s, ignoring: %m", u
->cgroup_path
);
1910 /* Set attributes */
1911 cgroup_context_apply(u
, target_mask
, state
);
1912 cgroup_xattr_apply(u
);
1917 static int unit_attach_pid_to_cgroup_via_bus(Unit
*u
, pid_t pid
, const char *suffix_path
) {
1918 _cleanup_(sd_bus_error_free
) sd_bus_error error
= SD_BUS_ERROR_NULL
;
1924 if (MANAGER_IS_SYSTEM(u
->manager
))
1927 if (!u
->manager
->system_bus
)
1930 if (!u
->cgroup_path
)
1933 /* Determine this unit's cgroup path relative to our cgroup root */
1934 pp
= path_startswith(u
->cgroup_path
, u
->manager
->cgroup_root
);
1938 pp
= strjoina("/", pp
, suffix_path
);
1939 path_simplify(pp
, false);
1941 r
= sd_bus_call_method(u
->manager
->system_bus
,
1942 "org.freedesktop.systemd1",
1943 "/org/freedesktop/systemd1",
1944 "org.freedesktop.systemd1.Manager",
1945 "AttachProcessesToUnit",
1948 NULL
/* empty unit name means client's unit, i.e. us */, pp
, 1, (uint32_t) pid
);
1950 return log_unit_debug_errno(u
, r
, "Failed to attach unit process " PID_FMT
" via the bus: %s", pid
, bus_error_message(&error
, r
));
1955 int unit_attach_pids_to_cgroup(Unit
*u
, Set
*pids
, const char *suffix_path
) {
1956 CGroupMask delegated_mask
;
1964 if (!UNIT_HAS_CGROUP_CONTEXT(u
))
1967 if (set_isempty(pids
))
1970 /* Load any custom firewall BPF programs here once to test if they are existing and actually loadable.
1971 * Fail here early since later errors in the call chain unit_realize_cgroup to cgroup_context_apply are ignored. */
1972 r
= bpf_firewall_load_custom(u
);
1976 r
= unit_realize_cgroup(u
);
1980 if (isempty(suffix_path
))
1983 p
= prefix_roota(u
->cgroup_path
, suffix_path
);
1985 delegated_mask
= unit_get_delegate_mask(u
);
1988 SET_FOREACH(pidp
, pids
, i
) {
1989 pid_t pid
= PTR_TO_PID(pidp
);
1992 /* First, attach the PID to the main cgroup hierarchy */
1993 q
= cg_attach(SYSTEMD_CGROUP_CONTROLLER
, p
, pid
);
1995 log_unit_debug_errno(u
, q
, "Couldn't move process " PID_FMT
" to requested cgroup '%s': %m", pid
, p
);
1997 if (MANAGER_IS_USER(u
->manager
) && IN_SET(q
, -EPERM
, -EACCES
)) {
2000 /* If we are in a user instance, and we can't move the process ourselves due to
2001 * permission problems, let's ask the system instance about it instead. Since it's more
2002 * privileged it might be able to move the process across the leaves of a subtree who's
2003 * top node is not owned by us. */
2005 z
= unit_attach_pid_to_cgroup_via_bus(u
, pid
, suffix_path
);
2007 log_unit_debug_errno(u
, z
, "Couldn't move process " PID_FMT
" to requested cgroup '%s' via the system bus either: %m", pid
, p
);
2009 continue; /* When the bus thing worked via the bus we are fully done for this PID. */
2013 r
= q
; /* Remember first error */
2018 q
= cg_all_unified();
2024 /* In the legacy hierarchy, attach the process to the request cgroup if possible, and if not to the
2025 * innermost realized one */
2027 for (c
= 0; c
< _CGROUP_CONTROLLER_MAX
; c
++) {
2028 CGroupMask bit
= CGROUP_CONTROLLER_TO_MASK(c
);
2029 const char *realized
;
2031 if (!(u
->manager
->cgroup_supported
& bit
))
2034 /* If this controller is delegated and realized, honour the caller's request for the cgroup suffix. */
2035 if (delegated_mask
& u
->cgroup_realized_mask
& bit
) {
2036 q
= cg_attach(cgroup_controller_to_string(c
), p
, pid
);
2038 continue; /* Success! */
2040 log_unit_debug_errno(u
, q
, "Failed to attach PID " PID_FMT
" to requested cgroup %s in controller %s, falling back to unit's cgroup: %m",
2041 pid
, p
, cgroup_controller_to_string(c
));
2044 /* So this controller is either not delegate or realized, or something else weird happened. In
2045 * that case let's attach the PID at least to the closest cgroup up the tree that is
2047 realized
= unit_get_realized_cgroup_path(u
, bit
);
2049 continue; /* Not even realized in the root slice? Then let's not bother */
2051 q
= cg_attach(cgroup_controller_to_string(c
), realized
, pid
);
2053 log_unit_debug_errno(u
, q
, "Failed to attach PID " PID_FMT
" to realized cgroup %s in controller %s, ignoring: %m",
2054 pid
, realized
, cgroup_controller_to_string(c
));
2061 static bool unit_has_mask_realized(
2063 CGroupMask target_mask
,
2064 CGroupMask enable_mask
) {
2068 /* Returns true if this unit is fully realized. We check four things:
2070 * 1. Whether the cgroup was created at all
2071 * 2. Whether the cgroup was created in all the hierarchies we need it to be created in (in case of cgroup v1)
2072 * 3. Whether the cgroup has all the right controllers enabled (in case of cgroup v2)
2073 * 4. Whether the invalidation mask is currently zero
2075 * If you wonder why we mask the target realization and enable mask with CGROUP_MASK_V1/CGROUP_MASK_V2: note
2076 * that there are three sets of bitmasks: CGROUP_MASK_V1 (for real cgroup v1 controllers), CGROUP_MASK_V2 (for
2077 * real cgroup v2 controllers) and CGROUP_MASK_BPF (for BPF-based pseudo-controllers). Now, cgroup_realized_mask
2078 * is only matters for cgroup v1 controllers, and cgroup_enabled_mask only used for cgroup v2, and if they
2079 * differ in the others, we don't really care. (After all, the cgroup_enabled_mask tracks with controllers are
2080 * enabled through cgroup.subtree_control, and since the BPF pseudo-controllers don't show up there, they
2081 * simply don't matter. */
2083 return u
->cgroup_realized
&&
2084 ((u
->cgroup_realized_mask
^ target_mask
) & CGROUP_MASK_V1
) == 0 &&
2085 ((u
->cgroup_enabled_mask
^ enable_mask
) & CGROUP_MASK_V2
) == 0 &&
2086 u
->cgroup_invalidated_mask
== 0;
2089 static bool unit_has_mask_disables_realized(
2091 CGroupMask target_mask
,
2092 CGroupMask enable_mask
) {
2096 /* Returns true if all controllers which should be disabled are indeed disabled.
2098 * Unlike unit_has_mask_realized, we don't care what was enabled, only that anything we want to remove is
2099 * already removed. */
2101 return !u
->cgroup_realized
||
2102 (FLAGS_SET(u
->cgroup_realized_mask
, target_mask
& CGROUP_MASK_V1
) &&
2103 FLAGS_SET(u
->cgroup_enabled_mask
, enable_mask
& CGROUP_MASK_V2
));
2106 static bool unit_has_mask_enables_realized(
2108 CGroupMask target_mask
,
2109 CGroupMask enable_mask
) {
2113 /* Returns true if all controllers which should be enabled are indeed enabled.
2115 * Unlike unit_has_mask_realized, we don't care about the controllers that are not present, only that anything
2116 * we want to add is already added. */
2118 return u
->cgroup_realized
&&
2119 ((u
->cgroup_realized_mask
| target_mask
) & CGROUP_MASK_V1
) == (u
->cgroup_realized_mask
& CGROUP_MASK_V1
) &&
2120 ((u
->cgroup_enabled_mask
| enable_mask
) & CGROUP_MASK_V2
) == (u
->cgroup_enabled_mask
& CGROUP_MASK_V2
);
2123 void unit_add_to_cgroup_realize_queue(Unit
*u
) {
2126 if (u
->in_cgroup_realize_queue
)
2129 LIST_PREPEND(cgroup_realize_queue
, u
->manager
->cgroup_realize_queue
, u
);
2130 u
->in_cgroup_realize_queue
= true;
2133 static void unit_remove_from_cgroup_realize_queue(Unit
*u
) {
2136 if (!u
->in_cgroup_realize_queue
)
2139 LIST_REMOVE(cgroup_realize_queue
, u
->manager
->cgroup_realize_queue
, u
);
2140 u
->in_cgroup_realize_queue
= false;
2143 /* Controllers can only be enabled breadth-first, from the root of the
2144 * hierarchy downwards to the unit in question. */
2145 static int unit_realize_cgroup_now_enable(Unit
*u
, ManagerState state
) {
2146 CGroupMask target_mask
, enable_mask
, new_target_mask
, new_enable_mask
;
2151 /* First go deal with this unit's parent, or we won't be able to enable
2152 * any new controllers at this layer. */
2153 if (UNIT_ISSET(u
->slice
)) {
2154 r
= unit_realize_cgroup_now_enable(UNIT_DEREF(u
->slice
), state
);
2159 target_mask
= unit_get_target_mask(u
);
2160 enable_mask
= unit_get_enable_mask(u
);
2162 /* We can only enable in this direction, don't try to disable anything.
2164 if (unit_has_mask_enables_realized(u
, target_mask
, enable_mask
))
2167 new_target_mask
= u
->cgroup_realized_mask
| target_mask
;
2168 new_enable_mask
= u
->cgroup_enabled_mask
| enable_mask
;
2170 return unit_create_cgroup(u
, new_target_mask
, new_enable_mask
, state
);
2173 /* Controllers can only be disabled depth-first, from the leaves of the
2174 * hierarchy upwards to the unit in question. */
2175 static int unit_realize_cgroup_now_disable(Unit
*u
, ManagerState state
) {
2182 if (u
->type
!= UNIT_SLICE
)
2185 HASHMAP_FOREACH_KEY(v
, m
, u
->dependencies
[UNIT_BEFORE
], i
) {
2186 CGroupMask target_mask
, enable_mask
, new_target_mask
, new_enable_mask
;
2189 if (UNIT_DEREF(m
->slice
) != u
)
2192 /* The cgroup for this unit might not actually be fully
2193 * realised yet, in which case it isn't holding any controllers
2195 if (!m
->cgroup_path
)
2198 /* We must disable those below us first in order to release the
2200 if (m
->type
== UNIT_SLICE
)
2201 (void) unit_realize_cgroup_now_disable(m
, state
);
2203 target_mask
= unit_get_target_mask(m
);
2204 enable_mask
= unit_get_enable_mask(m
);
2206 /* We can only disable in this direction, don't try to enable
2208 if (unit_has_mask_disables_realized(m
, target_mask
, enable_mask
))
2211 new_target_mask
= m
->cgroup_realized_mask
& target_mask
;
2212 new_enable_mask
= m
->cgroup_enabled_mask
& enable_mask
;
2214 r
= unit_create_cgroup(m
, new_target_mask
, new_enable_mask
, state
);
2222 /* Check if necessary controllers and attributes for a unit are in place.
2224 * - If so, do nothing.
2225 * - If not, create paths, move processes over, and set attributes.
2227 * Controllers can only be *enabled* in a breadth-first way, and *disabled* in
2228 * a depth-first way. As such the process looks like this:
2230 * Suppose we have a cgroup hierarchy which looks like this:
2243 * 1. We want to realise cgroup "d" now.
2244 * 2. cgroup "a" has DisableControllers=cpu in the associated unit.
2245 * 3. cgroup "k" just started requesting the memory controller.
2247 * To make this work we must do the following in order:
2249 * 1. Disable CPU controller in k, j
2250 * 2. Disable CPU controller in d
2251 * 3. Enable memory controller in root
2252 * 4. Enable memory controller in a
2253 * 5. Enable memory controller in d
2254 * 6. Enable memory controller in k
2256 * Notice that we need to touch j in one direction, but not the other. We also
2257 * don't go beyond d when disabling -- it's up to "a" to get realized if it
2258 * wants to disable further. The basic rules are therefore:
2260 * - If you're disabling something, you need to realise all of the cgroups from
2261 * your recursive descendants to the root. This starts from the leaves.
2262 * - If you're enabling something, you need to realise from the root cgroup
2263 * downwards, but you don't need to iterate your recursive descendants.
2265 * Returns 0 on success and < 0 on failure. */
2266 static int unit_realize_cgroup_now(Unit
*u
, ManagerState state
) {
2267 CGroupMask target_mask
, enable_mask
;
2272 unit_remove_from_cgroup_realize_queue(u
);
2274 target_mask
= unit_get_target_mask(u
);
2275 enable_mask
= unit_get_enable_mask(u
);
2277 if (unit_has_mask_realized(u
, target_mask
, enable_mask
))
2280 /* Disable controllers below us, if there are any */
2281 r
= unit_realize_cgroup_now_disable(u
, state
);
2285 /* Enable controllers above us, if there are any */
2286 if (UNIT_ISSET(u
->slice
)) {
2287 r
= unit_realize_cgroup_now_enable(UNIT_DEREF(u
->slice
), state
);
2292 /* Now actually deal with the cgroup we were trying to realise and set attributes */
2293 r
= unit_create_cgroup(u
, target_mask
, enable_mask
, state
);
2297 /* Now, reset the invalidation mask */
2298 u
->cgroup_invalidated_mask
= 0;
2302 unsigned manager_dispatch_cgroup_realize_queue(Manager
*m
) {
2310 state
= manager_state(m
);
2312 while ((i
= m
->cgroup_realize_queue
)) {
2313 assert(i
->in_cgroup_realize_queue
);
2315 if (UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(i
))) {
2316 /* Maybe things changed, and the unit is not actually active anymore? */
2317 unit_remove_from_cgroup_realize_queue(i
);
2321 r
= unit_realize_cgroup_now(i
, state
);
2323 log_warning_errno(r
, "Failed to realize cgroups for queued unit %s, ignoring: %m", i
->id
);
2331 static void unit_add_siblings_to_cgroup_realize_queue(Unit
*u
) {
2334 /* This adds the siblings of the specified unit and the
2335 * siblings of all parent units to the cgroup queue. (But
2336 * neither the specified unit itself nor the parents.) */
2338 while ((slice
= UNIT_DEREF(u
->slice
))) {
2343 HASHMAP_FOREACH_KEY(v
, m
, u
->dependencies
[UNIT_BEFORE
], i
) {
2344 /* Skip units that have a dependency on the slice
2345 * but aren't actually in it. */
2346 if (UNIT_DEREF(m
->slice
) != slice
)
2349 /* No point in doing cgroup application for units
2350 * without active processes. */
2351 if (UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(m
)))
2354 /* If the unit doesn't need any new controllers
2355 * and has current ones realized, it doesn't need
2357 if (unit_has_mask_realized(m
,
2358 unit_get_target_mask(m
),
2359 unit_get_enable_mask(m
)))
2362 unit_add_to_cgroup_realize_queue(m
);
2369 int unit_realize_cgroup(Unit
*u
) {
2372 if (!UNIT_HAS_CGROUP_CONTEXT(u
))
2375 /* So, here's the deal: when realizing the cgroups for this
2376 * unit, we need to first create all parents, but there's more
2377 * actually: for the weight-based controllers we also need to
2378 * make sure that all our siblings (i.e. units that are in the
2379 * same slice as we are) have cgroups, too. Otherwise, things
2380 * would become very uneven as each of their processes would
2381 * get as much resources as all our group together. This call
2382 * will synchronously create the parent cgroups, but will
2383 * defer work on the siblings to the next event loop
2386 /* Add all sibling slices to the cgroup queue. */
2387 unit_add_siblings_to_cgroup_realize_queue(u
);
2389 /* And realize this one now (and apply the values) */
2390 return unit_realize_cgroup_now(u
, manager_state(u
->manager
));
2393 void unit_release_cgroup(Unit
*u
) {
2396 /* Forgets all cgroup details for this cgroup — but does *not* destroy the cgroup. This is hence OK to call
2397 * when we close down everything for reexecution, where we really want to leave the cgroup in place. */
2399 if (u
->cgroup_path
) {
2400 (void) hashmap_remove(u
->manager
->cgroup_unit
, u
->cgroup_path
);
2401 u
->cgroup_path
= mfree(u
->cgroup_path
);
2404 if (u
->cgroup_control_inotify_wd
>= 0) {
2405 if (inotify_rm_watch(u
->manager
->cgroup_inotify_fd
, u
->cgroup_control_inotify_wd
) < 0)
2406 log_unit_debug_errno(u
, errno
, "Failed to remove cgroup control inotify watch %i for %s, ignoring: %m", u
->cgroup_control_inotify_wd
, u
->id
);
2408 (void) hashmap_remove(u
->manager
->cgroup_control_inotify_wd_unit
, INT_TO_PTR(u
->cgroup_control_inotify_wd
));
2409 u
->cgroup_control_inotify_wd
= -1;
2412 if (u
->cgroup_memory_inotify_wd
>= 0) {
2413 if (inotify_rm_watch(u
->manager
->cgroup_inotify_fd
, u
->cgroup_memory_inotify_wd
) < 0)
2414 log_unit_debug_errno(u
, errno
, "Failed to remove cgroup memory inotify watch %i for %s, ignoring: %m", u
->cgroup_memory_inotify_wd
, u
->id
);
2416 (void) hashmap_remove(u
->manager
->cgroup_memory_inotify_wd_unit
, INT_TO_PTR(u
->cgroup_memory_inotify_wd
));
2417 u
->cgroup_memory_inotify_wd
= -1;
2421 void unit_prune_cgroup(Unit
*u
) {
2427 /* Removes the cgroup, if empty and possible, and stops watching it. */
2429 if (!u
->cgroup_path
)
2432 (void) unit_get_cpu_usage(u
, NULL
); /* Cache the last CPU usage value before we destroy the cgroup */
2434 is_root_slice
= unit_has_name(u
, SPECIAL_ROOT_SLICE
);
2436 r
= cg_trim_everywhere(u
->manager
->cgroup_supported
, u
->cgroup_path
, !is_root_slice
);
2438 /* One reason we could have failed here is, that the cgroup still contains a process.
2439 * However, if the cgroup becomes removable at a later time, it might be removed when
2440 * the containing slice is stopped. So even if we failed now, this unit shouldn't assume
2441 * that the cgroup is still realized the next time it is started. Do not return early
2442 * on error, continue cleanup. */
2443 log_unit_full(u
, r
== -EBUSY
? LOG_DEBUG
: LOG_WARNING
, r
, "Failed to destroy cgroup %s, ignoring: %m", u
->cgroup_path
);
2448 unit_release_cgroup(u
);
2450 u
->cgroup_realized
= false;
2451 u
->cgroup_realized_mask
= 0;
2452 u
->cgroup_enabled_mask
= 0;
2454 u
->bpf_device_control_installed
= bpf_program_unref(u
->bpf_device_control_installed
);
2457 int unit_search_main_pid(Unit
*u
, pid_t
*ret
) {
2458 _cleanup_fclose_
FILE *f
= NULL
;
2459 pid_t pid
= 0, npid
;
2465 if (!u
->cgroup_path
)
2468 r
= cg_enumerate_processes(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, &f
);
2472 while (cg_read_pid(f
, &npid
) > 0) {
2477 if (pid_is_my_child(npid
) == 0)
2481 /* Dang, there's more than one daemonized PID
2482 in this group, so we don't know what process
2483 is the main process. */
2494 static int unit_watch_pids_in_path(Unit
*u
, const char *path
) {
2495 _cleanup_closedir_
DIR *d
= NULL
;
2496 _cleanup_fclose_
FILE *f
= NULL
;
2502 r
= cg_enumerate_processes(SYSTEMD_CGROUP_CONTROLLER
, path
, &f
);
2508 while ((r
= cg_read_pid(f
, &pid
)) > 0) {
2509 r
= unit_watch_pid(u
, pid
, false);
2510 if (r
< 0 && ret
>= 0)
2514 if (r
< 0 && ret
>= 0)
2518 r
= cg_enumerate_subgroups(SYSTEMD_CGROUP_CONTROLLER
, path
, &d
);
2525 while ((r
= cg_read_subgroup(d
, &fn
)) > 0) {
2526 _cleanup_free_
char *p
= NULL
;
2528 p
= path_join(empty_to_root(path
), fn
);
2534 r
= unit_watch_pids_in_path(u
, p
);
2535 if (r
< 0 && ret
>= 0)
2539 if (r
< 0 && ret
>= 0)
2546 int unit_synthesize_cgroup_empty_event(Unit
*u
) {
2551 /* Enqueue a synthetic cgroup empty event if this unit doesn't watch any PIDs anymore. This is compatibility
2552 * support for non-unified systems where notifications aren't reliable, and hence need to take whatever we can
2553 * get as notification source as soon as we stopped having any useful PIDs to watch for. */
2555 if (!u
->cgroup_path
)
2558 r
= cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER
);
2561 if (r
> 0) /* On unified we have reliable notifications, and don't need this */
2564 if (!set_isempty(u
->pids
))
2567 unit_add_to_cgroup_empty_queue(u
);
2571 int unit_watch_all_pids(Unit
*u
) {
2576 /* Adds all PIDs from our cgroup to the set of PIDs we
2577 * watch. This is a fallback logic for cases where we do not
2578 * get reliable cgroup empty notifications: we try to use
2579 * SIGCHLD as replacement. */
2581 if (!u
->cgroup_path
)
2584 r
= cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER
);
2587 if (r
> 0) /* On unified we can use proper notifications */
2590 return unit_watch_pids_in_path(u
, u
->cgroup_path
);
2593 static int on_cgroup_empty_event(sd_event_source
*s
, void *userdata
) {
2594 Manager
*m
= userdata
;
2601 u
= m
->cgroup_empty_queue
;
2605 assert(u
->in_cgroup_empty_queue
);
2606 u
->in_cgroup_empty_queue
= false;
2607 LIST_REMOVE(cgroup_empty_queue
, m
->cgroup_empty_queue
, u
);
2609 if (m
->cgroup_empty_queue
) {
2610 /* More stuff queued, let's make sure we remain enabled */
2611 r
= sd_event_source_set_enabled(s
, SD_EVENT_ONESHOT
);
2613 log_debug_errno(r
, "Failed to reenable cgroup empty event source, ignoring: %m");
2616 unit_add_to_gc_queue(u
);
2618 if (UNIT_VTABLE(u
)->notify_cgroup_empty
)
2619 UNIT_VTABLE(u
)->notify_cgroup_empty(u
);
2624 void unit_add_to_cgroup_empty_queue(Unit
*u
) {
2629 /* Note that there are four different ways how cgroup empty events reach us:
2631 * 1. On the unified hierarchy we get an inotify event on the cgroup
2633 * 2. On the legacy hierarchy, when running in system mode, we get a datagram on the cgroup agent socket
2635 * 3. On the legacy hierarchy, when running in user mode, we get a D-Bus signal on the system bus
2637 * 4. On the legacy hierarchy, in service units we start watching all processes of the cgroup for SIGCHLD as
2638 * soon as we get one SIGCHLD, to deal with unreliable cgroup notifications.
2640 * Regardless which way we got the notification, we'll verify it here, and then add it to a separate
2641 * queue. This queue will be dispatched at a lower priority than the SIGCHLD handler, so that we always use
2642 * SIGCHLD if we can get it first, and only use the cgroup empty notifications if there's no SIGCHLD pending
2643 * (which might happen if the cgroup doesn't contain processes that are our own child, which is typically the
2644 * case for scope units). */
2646 if (u
->in_cgroup_empty_queue
)
2649 /* Let's verify that the cgroup is really empty */
2650 if (!u
->cgroup_path
)
2652 r
= cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
);
2654 log_unit_debug_errno(u
, r
, "Failed to determine whether cgroup %s is empty: %m", u
->cgroup_path
);
2660 LIST_PREPEND(cgroup_empty_queue
, u
->manager
->cgroup_empty_queue
, u
);
2661 u
->in_cgroup_empty_queue
= true;
2663 /* Trigger the defer event */
2664 r
= sd_event_source_set_enabled(u
->manager
->cgroup_empty_event_source
, SD_EVENT_ONESHOT
);
2666 log_debug_errno(r
, "Failed to enable cgroup empty event source: %m");
2669 int unit_check_oom(Unit
*u
) {
2670 _cleanup_free_
char *oom_kill
= NULL
;
2675 if (!u
->cgroup_path
)
2678 r
= cg_get_keyed_attribute("memory", u
->cgroup_path
, "memory.events", STRV_MAKE("oom_kill"), &oom_kill
);
2680 return log_unit_debug_errno(u
, r
, "Failed to read oom_kill field of memory.events cgroup attribute: %m");
2682 r
= safe_atou64(oom_kill
, &c
);
2684 return log_unit_debug_errno(u
, r
, "Failed to parse oom_kill field: %m");
2686 increased
= c
> u
->oom_kill_last
;
2687 u
->oom_kill_last
= c
;
2692 log_struct(LOG_NOTICE
,
2693 "MESSAGE_ID=" SD_MESSAGE_UNIT_OUT_OF_MEMORY_STR
,
2695 LOG_UNIT_INVOCATION_ID(u
),
2696 LOG_UNIT_MESSAGE(u
, "A process of this unit has been killed by the OOM killer."));
2698 if (UNIT_VTABLE(u
)->notify_cgroup_oom
)
2699 UNIT_VTABLE(u
)->notify_cgroup_oom(u
);
2704 static int on_cgroup_oom_event(sd_event_source
*s
, void *userdata
) {
2705 Manager
*m
= userdata
;
2712 u
= m
->cgroup_oom_queue
;
2716 assert(u
->in_cgroup_oom_queue
);
2717 u
->in_cgroup_oom_queue
= false;
2718 LIST_REMOVE(cgroup_oom_queue
, m
->cgroup_oom_queue
, u
);
2720 if (m
->cgroup_oom_queue
) {
2721 /* More stuff queued, let's make sure we remain enabled */
2722 r
= sd_event_source_set_enabled(s
, SD_EVENT_ONESHOT
);
2724 log_debug_errno(r
, "Failed to reenable cgroup oom event source, ignoring: %m");
2727 (void) unit_check_oom(u
);
2731 static void unit_add_to_cgroup_oom_queue(Unit
*u
) {
2736 if (u
->in_cgroup_oom_queue
)
2738 if (!u
->cgroup_path
)
2741 LIST_PREPEND(cgroup_oom_queue
, u
->manager
->cgroup_oom_queue
, u
);
2742 u
->in_cgroup_oom_queue
= true;
2744 /* Trigger the defer event */
2745 if (!u
->manager
->cgroup_oom_event_source
) {
2746 _cleanup_(sd_event_source_unrefp
) sd_event_source
*s
= NULL
;
2748 r
= sd_event_add_defer(u
->manager
->event
, &s
, on_cgroup_oom_event
, u
->manager
);
2750 log_error_errno(r
, "Failed to create cgroup oom event source: %m");
2754 r
= sd_event_source_set_priority(s
, SD_EVENT_PRIORITY_NORMAL
-8);
2756 log_error_errno(r
, "Failed to set priority of cgroup oom event source: %m");
2760 (void) sd_event_source_set_description(s
, "cgroup-oom");
2761 u
->manager
->cgroup_oom_event_source
= TAKE_PTR(s
);
2764 r
= sd_event_source_set_enabled(u
->manager
->cgroup_oom_event_source
, SD_EVENT_ONESHOT
);
2766 log_error_errno(r
, "Failed to enable cgroup oom event source: %m");
2769 static int on_cgroup_inotify_event(sd_event_source
*s
, int fd
, uint32_t revents
, void *userdata
) {
2770 Manager
*m
= userdata
;
2777 union inotify_event_buffer buffer
;
2778 struct inotify_event
*e
;
2781 l
= read(fd
, &buffer
, sizeof(buffer
));
2783 if (IN_SET(errno
, EINTR
, EAGAIN
))
2786 return log_error_errno(errno
, "Failed to read control group inotify events: %m");
2789 FOREACH_INOTIFY_EVENT(e
, buffer
, l
) {
2793 /* Queue overflow has no watch descriptor */
2796 if (e
->mask
& IN_IGNORED
)
2797 /* The watch was just removed */
2800 /* Note that inotify might deliver events for a watch even after it was removed,
2801 * because it was queued before the removal. Let's ignore this here safely. */
2803 u
= hashmap_get(m
->cgroup_control_inotify_wd_unit
, INT_TO_PTR(e
->wd
));
2805 unit_add_to_cgroup_empty_queue(u
);
2807 u
= hashmap_get(m
->cgroup_memory_inotify_wd_unit
, INT_TO_PTR(e
->wd
));
2809 unit_add_to_cgroup_oom_queue(u
);
2814 static int cg_bpf_mask_supported(CGroupMask
*ret
) {
2815 CGroupMask mask
= 0;
2818 /* BPF-based firewall */
2819 r
= bpf_firewall_supported();
2821 mask
|= CGROUP_MASK_BPF_FIREWALL
;
2823 /* BPF-based device access control */
2824 r
= bpf_devices_supported();
2826 mask
|= CGROUP_MASK_BPF_DEVICES
;
2832 int manager_setup_cgroup(Manager
*m
) {
2833 _cleanup_free_
char *path
= NULL
;
2834 const char *scope_path
;
2842 /* 1. Determine hierarchy */
2843 m
->cgroup_root
= mfree(m
->cgroup_root
);
2844 r
= cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER
, 0, &m
->cgroup_root
);
2846 return log_error_errno(r
, "Cannot determine cgroup we are running in: %m");
2848 /* Chop off the init scope, if we are already located in it */
2849 e
= endswith(m
->cgroup_root
, "/" SPECIAL_INIT_SCOPE
);
2851 /* LEGACY: Also chop off the system slice if we are in
2852 * it. This is to support live upgrades from older systemd
2853 * versions where PID 1 was moved there. Also see
2854 * cg_get_root_path(). */
2855 if (!e
&& MANAGER_IS_SYSTEM(m
)) {
2856 e
= endswith(m
->cgroup_root
, "/" SPECIAL_SYSTEM_SLICE
);
2858 e
= endswith(m
->cgroup_root
, "/system"); /* even more legacy */
2863 /* And make sure to store away the root value without trailing slash, even for the root dir, so that we can
2864 * easily prepend it everywhere. */
2865 delete_trailing_chars(m
->cgroup_root
, "/");
2868 r
= cg_get_path(SYSTEMD_CGROUP_CONTROLLER
, m
->cgroup_root
, NULL
, &path
);
2870 return log_error_errno(r
, "Cannot find cgroup mount point: %m");
2872 r
= cg_unified_flush();
2874 return log_error_errno(r
, "Couldn't determine if we are running in the unified hierarchy: %m");
2876 all_unified
= cg_all_unified();
2877 if (all_unified
< 0)
2878 return log_error_errno(all_unified
, "Couldn't determine whether we are in all unified mode: %m");
2879 if (all_unified
> 0)
2880 log_debug("Unified cgroup hierarchy is located at %s.", path
);
2882 r
= cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER
);
2884 return log_error_errno(r
, "Failed to determine whether systemd's own controller is in unified mode: %m");
2886 log_debug("Unified cgroup hierarchy is located at %s. Controllers are on legacy hierarchies.", path
);
2888 log_debug("Using cgroup controller " SYSTEMD_CGROUP_CONTROLLER_LEGACY
". File system hierarchy is at %s.", path
);
2891 /* 3. Allocate cgroup empty defer event source */
2892 m
->cgroup_empty_event_source
= sd_event_source_unref(m
->cgroup_empty_event_source
);
2893 r
= sd_event_add_defer(m
->event
, &m
->cgroup_empty_event_source
, on_cgroup_empty_event
, m
);
2895 return log_error_errno(r
, "Failed to create cgroup empty event source: %m");
2897 /* Schedule cgroup empty checks early, but after having processed service notification messages or
2898 * SIGCHLD signals, so that a cgroup running empty is always just the last safety net of
2899 * notification, and we collected the metadata the notification and SIGCHLD stuff offers first. */
2900 r
= sd_event_source_set_priority(m
->cgroup_empty_event_source
, SD_EVENT_PRIORITY_NORMAL
-5);
2902 return log_error_errno(r
, "Failed to set priority of cgroup empty event source: %m");
2904 r
= sd_event_source_set_enabled(m
->cgroup_empty_event_source
, SD_EVENT_OFF
);
2906 return log_error_errno(r
, "Failed to disable cgroup empty event source: %m");
2908 (void) sd_event_source_set_description(m
->cgroup_empty_event_source
, "cgroup-empty");
2910 /* 4. Install notifier inotify object, or agent */
2911 if (cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER
) > 0) {
2913 /* In the unified hierarchy we can get cgroup empty notifications via inotify. */
2915 m
->cgroup_inotify_event_source
= sd_event_source_unref(m
->cgroup_inotify_event_source
);
2916 safe_close(m
->cgroup_inotify_fd
);
2918 m
->cgroup_inotify_fd
= inotify_init1(IN_NONBLOCK
|IN_CLOEXEC
);
2919 if (m
->cgroup_inotify_fd
< 0)
2920 return log_error_errno(errno
, "Failed to create control group inotify object: %m");
2922 r
= sd_event_add_io(m
->event
, &m
->cgroup_inotify_event_source
, m
->cgroup_inotify_fd
, EPOLLIN
, on_cgroup_inotify_event
, m
);
2924 return log_error_errno(r
, "Failed to watch control group inotify object: %m");
2926 /* Process cgroup empty notifications early. Note that when this event is dispatched it'll
2927 * just add the unit to a cgroup empty queue, hence let's run earlier than that. Also see
2928 * handling of cgroup agent notifications, for the classic cgroup hierarchy support. */
2929 r
= sd_event_source_set_priority(m
->cgroup_inotify_event_source
, SD_EVENT_PRIORITY_NORMAL
-9);
2931 return log_error_errno(r
, "Failed to set priority of inotify event source: %m");
2933 (void) sd_event_source_set_description(m
->cgroup_inotify_event_source
, "cgroup-inotify");
2935 } else if (MANAGER_IS_SYSTEM(m
) && manager_owns_host_root_cgroup(m
) && !MANAGER_IS_TEST_RUN(m
)) {
2937 /* On the legacy hierarchy we only get notifications via cgroup agents. (Which isn't really reliable,
2938 * since it does not generate events when control groups with children run empty. */
2940 r
= cg_install_release_agent(SYSTEMD_CGROUP_CONTROLLER
, SYSTEMD_CGROUP_AGENT_PATH
);
2942 log_warning_errno(r
, "Failed to install release agent, ignoring: %m");
2944 log_debug("Installed release agent.");
2946 log_debug("Release agent already installed.");
2949 /* 5. Make sure we are in the special "init.scope" unit in the root slice. */
2950 scope_path
= strjoina(m
->cgroup_root
, "/" SPECIAL_INIT_SCOPE
);
2951 r
= cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER
, scope_path
, 0);
2953 /* Also, move all other userspace processes remaining in the root cgroup into that scope. */
2954 r
= cg_migrate(SYSTEMD_CGROUP_CONTROLLER
, m
->cgroup_root
, SYSTEMD_CGROUP_CONTROLLER
, scope_path
, 0);
2956 log_warning_errno(r
, "Couldn't move remaining userspace processes, ignoring: %m");
2958 /* 6. And pin it, so that it cannot be unmounted */
2959 safe_close(m
->pin_cgroupfs_fd
);
2960 m
->pin_cgroupfs_fd
= open(path
, O_RDONLY
|O_CLOEXEC
|O_DIRECTORY
|O_NOCTTY
|O_NONBLOCK
);
2961 if (m
->pin_cgroupfs_fd
< 0)
2962 return log_error_errno(errno
, "Failed to open pin file: %m");
2964 } else if (!MANAGER_IS_TEST_RUN(m
))
2965 return log_error_errno(r
, "Failed to create %s control group: %m", scope_path
);
2967 /* 7. Always enable hierarchical support if it exists... */
2968 if (!all_unified
&& !MANAGER_IS_TEST_RUN(m
))
2969 (void) cg_set_attribute("memory", "/", "memory.use_hierarchy", "1");
2971 /* 8. Figure out which controllers are supported */
2972 r
= cg_mask_supported(&m
->cgroup_supported
);
2974 return log_error_errno(r
, "Failed to determine supported controllers: %m");
2976 /* 9. Figure out which bpf-based pseudo-controllers are supported */
2977 r
= cg_bpf_mask_supported(&mask
);
2979 return log_error_errno(r
, "Failed to determine supported bpf-based pseudo-controllers: %m");
2980 m
->cgroup_supported
|= mask
;
2982 /* 10. Log which controllers are supported */
2983 for (c
= 0; c
< _CGROUP_CONTROLLER_MAX
; c
++)
2984 log_debug("Controller '%s' supported: %s", cgroup_controller_to_string(c
), yes_no(m
->cgroup_supported
& CGROUP_CONTROLLER_TO_MASK(c
)));
2989 void manager_shutdown_cgroup(Manager
*m
, bool delete) {
2992 /* We can't really delete the group, since we are in it. But
2994 if (delete && m
->cgroup_root
&& m
->test_run_flags
!= MANAGER_TEST_RUN_MINIMAL
)
2995 (void) cg_trim(SYSTEMD_CGROUP_CONTROLLER
, m
->cgroup_root
, false);
2997 m
->cgroup_empty_event_source
= sd_event_source_unref(m
->cgroup_empty_event_source
);
2999 m
->cgroup_control_inotify_wd_unit
= hashmap_free(m
->cgroup_control_inotify_wd_unit
);
3000 m
->cgroup_memory_inotify_wd_unit
= hashmap_free(m
->cgroup_memory_inotify_wd_unit
);
3002 m
->cgroup_inotify_event_source
= sd_event_source_unref(m
->cgroup_inotify_event_source
);
3003 m
->cgroup_inotify_fd
= safe_close(m
->cgroup_inotify_fd
);
3005 m
->pin_cgroupfs_fd
= safe_close(m
->pin_cgroupfs_fd
);
3007 m
->cgroup_root
= mfree(m
->cgroup_root
);
3010 Unit
* manager_get_unit_by_cgroup(Manager
*m
, const char *cgroup
) {
3017 u
= hashmap_get(m
->cgroup_unit
, cgroup
);
3021 p
= strdupa(cgroup
);
3025 e
= strrchr(p
, '/');
3027 return hashmap_get(m
->cgroup_unit
, SPECIAL_ROOT_SLICE
);
3031 u
= hashmap_get(m
->cgroup_unit
, p
);
3037 Unit
*manager_get_unit_by_pid_cgroup(Manager
*m
, pid_t pid
) {
3038 _cleanup_free_
char *cgroup
= NULL
;
3042 if (!pid_is_valid(pid
))
3045 if (cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER
, pid
, &cgroup
) < 0)
3048 return manager_get_unit_by_cgroup(m
, cgroup
);
3051 Unit
*manager_get_unit_by_pid(Manager
*m
, pid_t pid
) {
3056 /* Note that a process might be owned by multiple units, we return only one here, which is good enough for most
3057 * cases, though not strictly correct. We prefer the one reported by cgroup membership, as that's the most
3058 * relevant one as children of the process will be assigned to that one, too, before all else. */
3060 if (!pid_is_valid(pid
))
3063 if (pid
== getpid_cached())
3064 return hashmap_get(m
->units
, SPECIAL_INIT_SCOPE
);
3066 u
= manager_get_unit_by_pid_cgroup(m
, pid
);
3070 u
= hashmap_get(m
->watch_pids
, PID_TO_PTR(pid
));
3074 array
= hashmap_get(m
->watch_pids
, PID_TO_PTR(-pid
));
3081 int manager_notify_cgroup_empty(Manager
*m
, const char *cgroup
) {
3087 /* Called on the legacy hierarchy whenever we get an explicit cgroup notification from the cgroup agent process
3088 * or from the --system instance */
3090 log_debug("Got cgroup empty notification for: %s", cgroup
);
3092 u
= manager_get_unit_by_cgroup(m
, cgroup
);
3096 unit_add_to_cgroup_empty_queue(u
);
3100 int unit_get_memory_current(Unit
*u
, uint64_t *ret
) {
3101 _cleanup_free_
char *v
= NULL
;
3107 if (!UNIT_CGROUP_BOOL(u
, memory_accounting
))
3110 if (!u
->cgroup_path
)
3113 /* The root cgroup doesn't expose this information, let's get it from /proc instead */
3114 if (unit_has_host_root_cgroup(u
))
3115 return procfs_memory_get_used(ret
);
3117 if ((u
->cgroup_realized_mask
& CGROUP_MASK_MEMORY
) == 0)
3120 r
= cg_all_unified();
3124 r
= cg_get_attribute("memory", u
->cgroup_path
, "memory.current", &v
);
3126 r
= cg_get_attribute("memory", u
->cgroup_path
, "memory.usage_in_bytes", &v
);
3132 return safe_atou64(v
, ret
);
3135 int unit_get_tasks_current(Unit
*u
, uint64_t *ret
) {
3136 _cleanup_free_
char *v
= NULL
;
3142 if (!UNIT_CGROUP_BOOL(u
, tasks_accounting
))
3145 if (!u
->cgroup_path
)
3148 /* The root cgroup doesn't expose this information, let's get it from /proc instead */
3149 if (unit_has_host_root_cgroup(u
))
3150 return procfs_tasks_get_current(ret
);
3152 if ((u
->cgroup_realized_mask
& CGROUP_MASK_PIDS
) == 0)
3155 r
= cg_get_attribute("pids", u
->cgroup_path
, "pids.current", &v
);
3161 return safe_atou64(v
, ret
);
3164 static int unit_get_cpu_usage_raw(Unit
*u
, nsec_t
*ret
) {
3165 _cleanup_free_
char *v
= NULL
;
3172 if (!u
->cgroup_path
)
3175 /* The root cgroup doesn't expose this information, let's get it from /proc instead */
3176 if (unit_has_host_root_cgroup(u
))
3177 return procfs_cpu_get_usage(ret
);
3179 /* Requisite controllers for CPU accounting are not enabled */
3180 if ((get_cpu_accounting_mask() & ~u
->cgroup_realized_mask
) != 0)
3183 r
= cg_all_unified();
3187 _cleanup_free_
char *val
= NULL
;
3190 r
= cg_get_keyed_attribute("cpu", u
->cgroup_path
, "cpu.stat", STRV_MAKE("usage_usec"), &val
);
3191 if (IN_SET(r
, -ENOENT
, -ENXIO
))
3196 r
= safe_atou64(val
, &us
);
3200 ns
= us
* NSEC_PER_USEC
;
3202 r
= cg_get_attribute("cpuacct", u
->cgroup_path
, "cpuacct.usage", &v
);
3208 r
= safe_atou64(v
, &ns
);
3217 int unit_get_cpu_usage(Unit
*u
, nsec_t
*ret
) {
3223 /* Retrieve the current CPU usage counter. This will subtract the CPU counter taken when the unit was
3224 * started. If the cgroup has been removed already, returns the last cached value. To cache the value, simply
3225 * call this function with a NULL return value. */
3227 if (!UNIT_CGROUP_BOOL(u
, cpu_accounting
))
3230 r
= unit_get_cpu_usage_raw(u
, &ns
);
3231 if (r
== -ENODATA
&& u
->cpu_usage_last
!= NSEC_INFINITY
) {
3232 /* If we can't get the CPU usage anymore (because the cgroup was already removed, for example), use our
3236 *ret
= u
->cpu_usage_last
;
3242 if (ns
> u
->cpu_usage_base
)
3243 ns
-= u
->cpu_usage_base
;
3247 u
->cpu_usage_last
= ns
;
3254 int unit_get_ip_accounting(
3256 CGroupIPAccountingMetric metric
,
3263 assert(metric
>= 0);
3264 assert(metric
< _CGROUP_IP_ACCOUNTING_METRIC_MAX
);
3267 if (!UNIT_CGROUP_BOOL(u
, ip_accounting
))
3270 fd
= IN_SET(metric
, CGROUP_IP_INGRESS_BYTES
, CGROUP_IP_INGRESS_PACKETS
) ?
3271 u
->ip_accounting_ingress_map_fd
:
3272 u
->ip_accounting_egress_map_fd
;
3276 if (IN_SET(metric
, CGROUP_IP_INGRESS_BYTES
, CGROUP_IP_EGRESS_BYTES
))
3277 r
= bpf_firewall_read_accounting(fd
, &value
, NULL
);
3279 r
= bpf_firewall_read_accounting(fd
, NULL
, &value
);
3283 /* Add in additional metrics from a previous runtime. Note that when reexecing/reloading the daemon we compile
3284 * all BPF programs and maps anew, but serialize the old counters. When deserializing we store them in the
3285 * ip_accounting_extra[] field, and add them in here transparently. */
3287 *ret
= value
+ u
->ip_accounting_extra
[metric
];
3292 static int unit_get_io_accounting_raw(Unit
*u
, uint64_t ret
[static _CGROUP_IO_ACCOUNTING_METRIC_MAX
]) {
3293 static const char *const field_names
[_CGROUP_IO_ACCOUNTING_METRIC_MAX
] = {
3294 [CGROUP_IO_READ_BYTES
] = "rbytes=",
3295 [CGROUP_IO_WRITE_BYTES
] = "wbytes=",
3296 [CGROUP_IO_READ_OPERATIONS
] = "rios=",
3297 [CGROUP_IO_WRITE_OPERATIONS
] = "wios=",
3299 uint64_t acc
[_CGROUP_IO_ACCOUNTING_METRIC_MAX
] = {};
3300 _cleanup_free_
char *path
= NULL
;
3301 _cleanup_fclose_
FILE *f
= NULL
;
3306 if (!u
->cgroup_path
)
3309 if (unit_has_host_root_cgroup(u
))
3310 return -ENODATA
; /* TODO: return useful data for the top-level cgroup */
3312 r
= cg_all_unified();
3315 if (r
== 0) /* TODO: support cgroupv1 */
3318 if (!FLAGS_SET(u
->cgroup_realized_mask
, CGROUP_MASK_IO
))
3321 r
= cg_get_path("io", u
->cgroup_path
, "io.stat", &path
);
3325 f
= fopen(path
, "re");
3330 _cleanup_free_
char *line
= NULL
;
3333 r
= read_line(f
, LONG_LINE_MAX
, &line
);
3340 p
+= strcspn(p
, WHITESPACE
); /* Skip over device major/minor */
3341 p
+= strspn(p
, WHITESPACE
); /* Skip over following whitespace */
3344 _cleanup_free_
char *word
= NULL
;
3346 r
= extract_first_word(&p
, &word
, NULL
, EXTRACT_RETAIN_ESCAPE
);
3352 for (CGroupIOAccountingMetric i
= 0; i
< _CGROUP_IO_ACCOUNTING_METRIC_MAX
; i
++) {
3355 x
= startswith(word
, field_names
[i
]);
3359 r
= safe_atou64(x
, &w
);
3363 /* Sum up the stats of all devices */
3371 memcpy(ret
, acc
, sizeof(acc
));
3375 int unit_get_io_accounting(
3377 CGroupIOAccountingMetric metric
,
3381 uint64_t raw
[_CGROUP_IO_ACCOUNTING_METRIC_MAX
];
3384 /* Retrieve an IO account parameter. This will subtract the counter when the unit was started. */
3386 if (!UNIT_CGROUP_BOOL(u
, io_accounting
))
3389 if (allow_cache
&& u
->io_accounting_last
[metric
] != UINT64_MAX
)
3392 r
= unit_get_io_accounting_raw(u
, raw
);
3393 if (r
== -ENODATA
&& u
->io_accounting_last
[metric
] != UINT64_MAX
)
3398 for (CGroupIOAccountingMetric i
= 0; i
< _CGROUP_IO_ACCOUNTING_METRIC_MAX
; i
++) {
3399 /* Saturated subtraction */
3400 if (raw
[i
] > u
->io_accounting_base
[i
])
3401 u
->io_accounting_last
[i
] = raw
[i
] - u
->io_accounting_base
[i
];
3403 u
->io_accounting_last
[i
] = 0;
3408 *ret
= u
->io_accounting_last
[metric
];
3413 int unit_reset_cpu_accounting(Unit
*u
) {
3418 u
->cpu_usage_last
= NSEC_INFINITY
;
3420 r
= unit_get_cpu_usage_raw(u
, &u
->cpu_usage_base
);
3422 u
->cpu_usage_base
= 0;
3429 int unit_reset_ip_accounting(Unit
*u
) {
3434 if (u
->ip_accounting_ingress_map_fd
>= 0)
3435 r
= bpf_firewall_reset_accounting(u
->ip_accounting_ingress_map_fd
);
3437 if (u
->ip_accounting_egress_map_fd
>= 0)
3438 q
= bpf_firewall_reset_accounting(u
->ip_accounting_egress_map_fd
);
3440 zero(u
->ip_accounting_extra
);
3442 return r
< 0 ? r
: q
;
3445 int unit_reset_io_accounting(Unit
*u
) {
3450 for (CGroupIOAccountingMetric i
= 0; i
< _CGROUP_IO_ACCOUNTING_METRIC_MAX
; i
++)
3451 u
->io_accounting_last
[i
] = UINT64_MAX
;
3453 r
= unit_get_io_accounting_raw(u
, u
->io_accounting_base
);
3455 zero(u
->io_accounting_base
);
3462 int unit_reset_accounting(Unit
*u
) {
3467 r
= unit_reset_cpu_accounting(u
);
3468 q
= unit_reset_io_accounting(u
);
3469 v
= unit_reset_ip_accounting(u
);
3471 return r
< 0 ? r
: q
< 0 ? q
: v
;
3474 void unit_invalidate_cgroup(Unit
*u
, CGroupMask m
) {
3477 if (!UNIT_HAS_CGROUP_CONTEXT(u
))
3483 /* always invalidate compat pairs together */
3484 if (m
& (CGROUP_MASK_IO
| CGROUP_MASK_BLKIO
))
3485 m
|= CGROUP_MASK_IO
| CGROUP_MASK_BLKIO
;
3487 if (m
& (CGROUP_MASK_CPU
| CGROUP_MASK_CPUACCT
))
3488 m
|= CGROUP_MASK_CPU
| CGROUP_MASK_CPUACCT
;
3490 if (FLAGS_SET(u
->cgroup_invalidated_mask
, m
)) /* NOP? */
3493 u
->cgroup_invalidated_mask
|= m
;
3494 unit_add_to_cgroup_realize_queue(u
);
3497 void unit_invalidate_cgroup_bpf(Unit
*u
) {
3500 if (!UNIT_HAS_CGROUP_CONTEXT(u
))
3503 if (u
->cgroup_invalidated_mask
& CGROUP_MASK_BPF_FIREWALL
) /* NOP? */
3506 u
->cgroup_invalidated_mask
|= CGROUP_MASK_BPF_FIREWALL
;
3507 unit_add_to_cgroup_realize_queue(u
);
3509 /* If we are a slice unit, we also need to put compile a new BPF program for all our children, as the IP access
3510 * list of our children includes our own. */
3511 if (u
->type
== UNIT_SLICE
) {
3516 HASHMAP_FOREACH_KEY(v
, member
, u
->dependencies
[UNIT_BEFORE
], i
) {
3517 if (UNIT_DEREF(member
->slice
) == u
)
3518 unit_invalidate_cgroup_bpf(member
);
3523 bool unit_cgroup_delegate(Unit
*u
) {
3528 if (!UNIT_VTABLE(u
)->can_delegate
)
3531 c
= unit_get_cgroup_context(u
);
3538 void manager_invalidate_startup_units(Manager
*m
) {
3544 SET_FOREACH(u
, m
->startup_units
, i
)
3545 unit_invalidate_cgroup(u
, CGROUP_MASK_CPU
|CGROUP_MASK_IO
|CGROUP_MASK_BLKIO
);
3548 static int unit_get_nice(Unit
*u
) {
3551 ec
= unit_get_exec_context(u
);
3552 return ec
? ec
->nice
: 0;
3555 static uint64_t unit_get_cpu_weight(Unit
*u
) {
3556 ManagerState state
= manager_state(u
->manager
);
3559 cc
= unit_get_cgroup_context(u
);
3560 return cc
? cgroup_context_cpu_weight(cc
, state
) : CGROUP_WEIGHT_DEFAULT
;
3563 int compare_job_priority(const void *a
, const void *b
) {
3564 const Job
*x
= a
, *y
= b
;
3566 uint64_t weight_x
, weight_y
;
3569 if ((ret
= CMP(x
->unit
->type
, y
->unit
->type
)) != 0)
3572 weight_x
= unit_get_cpu_weight(x
->unit
);
3573 weight_y
= unit_get_cpu_weight(y
->unit
);
3575 if ((ret
= CMP(weight_x
, weight_y
)) != 0)
3578 nice_x
= unit_get_nice(x
->unit
);
3579 nice_y
= unit_get_nice(y
->unit
);
3581 if ((ret
= CMP(nice_x
, nice_y
)) != 0)
3584 return strcmp(x
->unit
->id
, y
->unit
->id
);
3587 static const char* const cgroup_device_policy_table
[_CGROUP_DEVICE_POLICY_MAX
] = {
3588 [CGROUP_AUTO
] = "auto",
3589 [CGROUP_CLOSED
] = "closed",
3590 [CGROUP_STRICT
] = "strict",
3593 int unit_get_cpuset(Unit
*u
, CPUSet
*cpus
, const char *name
) {
3594 _cleanup_free_
char *v
= NULL
;
3600 if (!u
->cgroup_path
)
3603 if ((u
->cgroup_realized_mask
& CGROUP_MASK_CPUSET
) == 0)
3606 r
= cg_all_unified();
3612 r
= cg_get_attribute("cpuset", u
->cgroup_path
, name
, &v
);
3618 return parse_cpu_set_full(v
, cpus
, false, NULL
, NULL
, 0, NULL
);
3621 DEFINE_STRING_TABLE_LOOKUP(cgroup_device_policy
, CGroupDevicePolicy
);