1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
5 #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 "bpf-foreign.h"
13 #include "bpf-socket-bind.h"
14 #include "btrfs-util.h"
15 #include "bus-error.h"
16 #include "cgroup-setup.h"
17 #include "cgroup-util.h"
21 #include "in-addr-prefix-util.h"
22 #include "inotify-util.h"
24 #include "ip-protocol-list.h"
25 #include "limits-util.h"
26 #include "nulstr-util.h"
27 #include "parse-util.h"
28 #include "path-util.h"
29 #include "percent-util.h"
30 #include "process-util.h"
31 #include "procfs-util.h"
32 #include "restrict-ifaces.h"
34 #include "stat-util.h"
35 #include "stdio-util.h"
36 #include "string-table.h"
37 #include "string-util.h"
41 #include "bpf-dlopen.h"
43 #include "bpf/restrict_fs/restrict-fs-skel.h"
46 #define CGROUP_CPU_QUOTA_DEFAULT_PERIOD_USEC ((usec_t) 100 * USEC_PER_MSEC)
48 /* Returns the log level to use when cgroup attribute writes fail. When an attribute is missing or we have access
49 * problems we downgrade to LOG_DEBUG. This is supposed to be nice to container managers and kernels which want to mask
50 * out specific attributes from us. */
51 #define LOG_LEVEL_CGROUP_WRITE(r) (IN_SET(abs(r), ENOENT, EROFS, EACCES, EPERM) ? LOG_DEBUG : LOG_WARNING)
53 uint64_t tasks_max_resolve(const TasksMax
*tasks_max
) {
54 if (tasks_max
->scale
== 0)
55 return tasks_max
->value
;
57 return system_tasks_max_scale(tasks_max
->value
, tasks_max
->scale
);
60 bool manager_owns_host_root_cgroup(Manager
*m
) {
63 /* Returns true if we are managing the root cgroup. Note that it isn't sufficient to just check whether the
64 * group root path equals "/" since that will also be the case if CLONE_NEWCGROUP is in the mix. Since there's
65 * appears to be no nice way to detect whether we are in a CLONE_NEWCGROUP namespace we instead just check if
66 * we run in any kind of container virtualization. */
68 if (MANAGER_IS_USER(m
))
71 if (detect_container() > 0)
74 return empty_or_root(m
->cgroup_root
);
77 bool unit_has_startup_cgroup_constraints(Unit
*u
) {
80 /* Returns true if this unit has any directives which apply during
81 * startup/shutdown phases. */
85 c
= unit_get_cgroup_context(u
);
89 return c
->startup_cpu_shares
!= CGROUP_CPU_SHARES_INVALID
||
90 c
->startup_io_weight
!= CGROUP_WEIGHT_INVALID
||
91 c
->startup_blockio_weight
!= CGROUP_BLKIO_WEIGHT_INVALID
||
92 c
->startup_cpuset_cpus
.set
||
93 c
->startup_cpuset_mems
.set
;
96 bool unit_has_host_root_cgroup(Unit
*u
) {
99 /* Returns whether this unit manages the root cgroup. This will return true if this unit is the root slice and
100 * the manager manages the root cgroup. */
102 if (!manager_owns_host_root_cgroup(u
->manager
))
105 return unit_has_name(u
, SPECIAL_ROOT_SLICE
);
108 static int set_attribute_and_warn(Unit
*u
, const char *controller
, const char *attribute
, const char *value
) {
111 r
= cg_set_attribute(controller
, u
->cgroup_path
, attribute
, value
);
113 log_unit_full_errno(u
, LOG_LEVEL_CGROUP_WRITE(r
), r
, "Failed to set '%s' attribute on '%s' to '%.*s': %m",
114 strna(attribute
), empty_to_root(u
->cgroup_path
), (int) strcspn(value
, NEWLINE
), value
);
119 static void cgroup_compat_warn(void) {
120 static bool cgroup_compat_warned
= false;
122 if (cgroup_compat_warned
)
125 log_warning("cgroup compatibility translation between legacy and unified hierarchy settings activated. "
126 "See cgroup-compat debug messages for details.");
128 cgroup_compat_warned
= true;
131 #define log_cgroup_compat(unit, fmt, ...) do { \
132 cgroup_compat_warn(); \
133 log_unit_debug(unit, "cgroup-compat: " fmt, ##__VA_ARGS__); \
136 void cgroup_context_init(CGroupContext
*c
) {
139 /* Initialize everything to the kernel defaults. */
141 *c
= (CGroupContext
) {
142 .cpu_weight
= CGROUP_WEIGHT_INVALID
,
143 .startup_cpu_weight
= CGROUP_WEIGHT_INVALID
,
144 .cpu_quota_per_sec_usec
= USEC_INFINITY
,
145 .cpu_quota_period_usec
= USEC_INFINITY
,
147 .cpu_shares
= CGROUP_CPU_SHARES_INVALID
,
148 .startup_cpu_shares
= CGROUP_CPU_SHARES_INVALID
,
150 .memory_high
= CGROUP_LIMIT_MAX
,
151 .memory_max
= CGROUP_LIMIT_MAX
,
152 .memory_swap_max
= CGROUP_LIMIT_MAX
,
154 .memory_limit
= CGROUP_LIMIT_MAX
,
156 .io_weight
= CGROUP_WEIGHT_INVALID
,
157 .startup_io_weight
= CGROUP_WEIGHT_INVALID
,
159 .blockio_weight
= CGROUP_BLKIO_WEIGHT_INVALID
,
160 .startup_blockio_weight
= CGROUP_BLKIO_WEIGHT_INVALID
,
162 .tasks_max
= TASKS_MAX_UNSET
,
164 .moom_swap
= MANAGED_OOM_AUTO
,
165 .moom_mem_pressure
= MANAGED_OOM_AUTO
,
166 .moom_preference
= MANAGED_OOM_PREFERENCE_NONE
,
170 void cgroup_context_free_device_allow(CGroupContext
*c
, CGroupDeviceAllow
*a
) {
174 LIST_REMOVE(device_allow
, c
->device_allow
, a
);
179 void cgroup_context_free_io_device_weight(CGroupContext
*c
, CGroupIODeviceWeight
*w
) {
183 LIST_REMOVE(device_weights
, c
->io_device_weights
, w
);
188 void cgroup_context_free_io_device_latency(CGroupContext
*c
, CGroupIODeviceLatency
*l
) {
192 LIST_REMOVE(device_latencies
, c
->io_device_latencies
, l
);
197 void cgroup_context_free_io_device_limit(CGroupContext
*c
, CGroupIODeviceLimit
*l
) {
201 LIST_REMOVE(device_limits
, c
->io_device_limits
, l
);
206 void cgroup_context_free_blockio_device_weight(CGroupContext
*c
, CGroupBlockIODeviceWeight
*w
) {
210 LIST_REMOVE(device_weights
, c
->blockio_device_weights
, w
);
215 void cgroup_context_free_blockio_device_bandwidth(CGroupContext
*c
, CGroupBlockIODeviceBandwidth
*b
) {
219 LIST_REMOVE(device_bandwidths
, c
->blockio_device_bandwidths
, b
);
224 void cgroup_context_remove_bpf_foreign_program(CGroupContext
*c
, CGroupBPFForeignProgram
*p
) {
228 LIST_REMOVE(programs
, c
->bpf_foreign_programs
, p
);
233 void cgroup_context_remove_socket_bind(CGroupSocketBindItem
**head
) {
237 CGroupSocketBindItem
*h
= *head
;
238 LIST_REMOVE(socket_bind_items
, *head
, h
);
243 void cgroup_context_done(CGroupContext
*c
) {
246 while (c
->io_device_weights
)
247 cgroup_context_free_io_device_weight(c
, c
->io_device_weights
);
249 while (c
->io_device_latencies
)
250 cgroup_context_free_io_device_latency(c
, c
->io_device_latencies
);
252 while (c
->io_device_limits
)
253 cgroup_context_free_io_device_limit(c
, c
->io_device_limits
);
255 while (c
->blockio_device_weights
)
256 cgroup_context_free_blockio_device_weight(c
, c
->blockio_device_weights
);
258 while (c
->blockio_device_bandwidths
)
259 cgroup_context_free_blockio_device_bandwidth(c
, c
->blockio_device_bandwidths
);
261 while (c
->device_allow
)
262 cgroup_context_free_device_allow(c
, c
->device_allow
);
264 cgroup_context_remove_socket_bind(&c
->socket_bind_allow
);
265 cgroup_context_remove_socket_bind(&c
->socket_bind_deny
);
267 c
->ip_address_allow
= set_free(c
->ip_address_allow
);
268 c
->ip_address_deny
= set_free(c
->ip_address_deny
);
270 c
->ip_filters_ingress
= strv_free(c
->ip_filters_ingress
);
271 c
->ip_filters_egress
= strv_free(c
->ip_filters_egress
);
273 while (c
->bpf_foreign_programs
)
274 cgroup_context_remove_bpf_foreign_program(c
, c
->bpf_foreign_programs
);
276 c
->restrict_network_interfaces
= set_free(c
->restrict_network_interfaces
);
278 cpu_set_reset(&c
->cpuset_cpus
);
279 cpu_set_reset(&c
->startup_cpuset_cpus
);
280 cpu_set_reset(&c
->cpuset_mems
);
281 cpu_set_reset(&c
->startup_cpuset_mems
);
284 static int unit_get_kernel_memory_limit(Unit
*u
, const char *file
, uint64_t *ret
) {
287 if (!u
->cgroup_realized
)
290 return cg_get_attribute_as_uint64("memory", u
->cgroup_path
, file
, ret
);
293 static int unit_compare_memory_limit(Unit
*u
, const char *property_name
, uint64_t *ret_unit_value
, uint64_t *ret_kernel_value
) {
300 /* Compare kernel memcg configuration against our internal systemd state. Unsupported (and will
301 * return -ENODATA) on cgroup v1.
306 * 0: If the kernel memory setting doesn't match our configuration.
307 * >0: If the kernel memory setting matches our configuration.
309 * The following values are only guaranteed to be populated on return >=0:
311 * - ret_unit_value will contain our internal expected value for the unit, page-aligned.
312 * - ret_kernel_value will contain the actual value presented by the kernel. */
316 r
= cg_all_unified();
318 return log_debug_errno(r
, "Failed to determine cgroup hierarchy version: %m");
320 /* Unsupported on v1.
322 * We don't return ENOENT, since that could actually mask a genuine problem where somebody else has
323 * silently masked the controller. */
327 /* The root slice doesn't have any controller files, so we can't compare anything. */
328 if (unit_has_name(u
, SPECIAL_ROOT_SLICE
))
331 /* It's possible to have MemoryFoo set without systemd wanting to have the memory controller enabled,
332 * for example, in the case of DisableControllers= or cgroup_disable on the kernel command line. To
333 * avoid specious errors in these scenarios, check that we even expect the memory controller to be
335 m
= unit_get_target_mask(u
);
336 if (!FLAGS_SET(m
, CGROUP_MASK_MEMORY
))
339 assert_se(c
= unit_get_cgroup_context(u
));
341 if (streq(property_name
, "MemoryLow")) {
342 unit_value
= unit_get_ancestor_memory_low(u
);
344 } else if (streq(property_name
, "MemoryMin")) {
345 unit_value
= unit_get_ancestor_memory_min(u
);
347 } else if (streq(property_name
, "MemoryHigh")) {
348 unit_value
= c
->memory_high
;
349 file
= "memory.high";
350 } else if (streq(property_name
, "MemoryMax")) {
351 unit_value
= c
->memory_max
;
353 } else if (streq(property_name
, "MemorySwapMax")) {
354 unit_value
= c
->memory_swap_max
;
355 file
= "memory.swap.max";
359 r
= unit_get_kernel_memory_limit(u
, file
, ret_kernel_value
);
361 return log_unit_debug_errno(u
, r
, "Failed to parse %s: %m", file
);
363 /* It's intended (soon) in a future kernel to not expose cgroup memory limits rounded to page
364 * boundaries, but instead separate the user-exposed limit, which is whatever userspace told us, from
365 * our internal page-counting. To support those future kernels, just check the value itself first
366 * without any page-alignment. */
367 if (*ret_kernel_value
== unit_value
) {
368 *ret_unit_value
= unit_value
;
372 /* The current kernel behaviour, by comparison, is that even if you write a particular number of
373 * bytes into a cgroup memory file, it always returns that number page-aligned down (since the kernel
374 * internally stores cgroup limits in pages). As such, so long as it aligns properly, everything is
376 if (unit_value
!= CGROUP_LIMIT_MAX
)
377 unit_value
= PAGE_ALIGN_DOWN(unit_value
);
379 *ret_unit_value
= unit_value
;
381 return *ret_kernel_value
== *ret_unit_value
;
384 #define FORMAT_CGROUP_DIFF_MAX 128
386 static char *format_cgroup_memory_limit_comparison(char *buf
, size_t l
, Unit
*u
, const char *property_name
) {
394 r
= unit_compare_memory_limit(u
, property_name
, &sval
, &kval
);
396 /* memory.swap.max is special in that it relies on CONFIG_MEMCG_SWAP (and the default swapaccount=1).
397 * In the absence of reliably being able to detect whether memcg swap support is available or not,
398 * only complain if the error is not ENOENT. */
399 if (r
> 0 || IN_SET(r
, -ENODATA
, -EOWNERDEAD
) ||
400 (r
== -ENOENT
&& streq(property_name
, "MemorySwapMax"))) {
406 (void) snprintf(buf
, l
, " (error getting kernel value: %s)", strerror_safe(r
));
410 (void) snprintf(buf
, l
, " (different value in kernel: %" PRIu64
")", kval
);
415 void cgroup_context_dump(Unit
*u
, FILE* f
, const char *prefix
) {
416 _cleanup_free_
char *disable_controllers_str
= NULL
, *cpuset_cpus
= NULL
, *cpuset_mems
= NULL
, *startup_cpuset_cpus
= NULL
, *startup_cpuset_mems
= NULL
;
417 CGroupIODeviceLimit
*il
;
418 CGroupIODeviceWeight
*iw
;
419 CGroupIODeviceLatency
*l
;
420 CGroupBlockIODeviceBandwidth
*b
;
421 CGroupBlockIODeviceWeight
*w
;
422 CGroupBPFForeignProgram
*p
;
423 CGroupDeviceAllow
*a
;
425 CGroupSocketBindItem
*bi
;
426 struct in_addr_prefix
*iaai
;
429 char cda
[FORMAT_CGROUP_DIFF_MAX
];
430 char cdb
[FORMAT_CGROUP_DIFF_MAX
];
431 char cdc
[FORMAT_CGROUP_DIFF_MAX
];
432 char cdd
[FORMAT_CGROUP_DIFF_MAX
];
433 char cde
[FORMAT_CGROUP_DIFF_MAX
];
438 assert_se(c
= unit_get_cgroup_context(u
));
440 prefix
= strempty(prefix
);
442 (void) cg_mask_to_string(c
->disable_controllers
, &disable_controllers_str
);
444 cpuset_cpus
= cpu_set_to_range_string(&c
->cpuset_cpus
);
445 startup_cpuset_cpus
= cpu_set_to_range_string(&c
->startup_cpuset_cpus
);
446 cpuset_mems
= cpu_set_to_range_string(&c
->cpuset_mems
);
447 startup_cpuset_mems
= cpu_set_to_range_string(&c
->startup_cpuset_mems
);
450 "%sCPUAccounting: %s\n"
451 "%sIOAccounting: %s\n"
452 "%sBlockIOAccounting: %s\n"
453 "%sMemoryAccounting: %s\n"
454 "%sTasksAccounting: %s\n"
455 "%sIPAccounting: %s\n"
456 "%sCPUWeight: %" PRIu64
"\n"
457 "%sStartupCPUWeight: %" PRIu64
"\n"
458 "%sCPUShares: %" PRIu64
"\n"
459 "%sStartupCPUShares: %" PRIu64
"\n"
460 "%sCPUQuotaPerSecSec: %s\n"
461 "%sCPUQuotaPeriodSec: %s\n"
462 "%sAllowedCPUs: %s\n"
463 "%sStartupAllowedCPUs: %s\n"
464 "%sAllowedMemoryNodes: %s\n"
465 "%sStartupAllowedMemoryNodes: %s\n"
466 "%sIOWeight: %" PRIu64
"\n"
467 "%sStartupIOWeight: %" PRIu64
"\n"
468 "%sBlockIOWeight: %" PRIu64
"\n"
469 "%sStartupBlockIOWeight: %" PRIu64
"\n"
470 "%sDefaultMemoryMin: %" PRIu64
"\n"
471 "%sDefaultMemoryLow: %" PRIu64
"\n"
472 "%sMemoryMin: %" PRIu64
"%s\n"
473 "%sMemoryLow: %" PRIu64
"%s\n"
474 "%sMemoryHigh: %" PRIu64
"%s\n"
475 "%sMemoryMax: %" PRIu64
"%s\n"
476 "%sMemorySwapMax: %" PRIu64
"%s\n"
477 "%sMemoryLimit: %" PRIu64
"\n"
478 "%sTasksMax: %" PRIu64
"\n"
479 "%sDevicePolicy: %s\n"
480 "%sDisableControllers: %s\n"
482 "%sManagedOOMSwap: %s\n"
483 "%sManagedOOMMemoryPressure: %s\n"
484 "%sManagedOOMMemoryPressureLimit: " PERMYRIAD_AS_PERCENT_FORMAT_STR
"\n"
485 "%sManagedOOMPreference: %s\n",
486 prefix
, yes_no(c
->cpu_accounting
),
487 prefix
, yes_no(c
->io_accounting
),
488 prefix
, yes_no(c
->blockio_accounting
),
489 prefix
, yes_no(c
->memory_accounting
),
490 prefix
, yes_no(c
->tasks_accounting
),
491 prefix
, yes_no(c
->ip_accounting
),
492 prefix
, c
->cpu_weight
,
493 prefix
, c
->startup_cpu_weight
,
494 prefix
, c
->cpu_shares
,
495 prefix
, c
->startup_cpu_shares
,
496 prefix
, FORMAT_TIMESPAN(c
->cpu_quota_per_sec_usec
, 1),
497 prefix
, FORMAT_TIMESPAN(c
->cpu_quota_period_usec
, 1),
498 prefix
, strempty(cpuset_cpus
),
499 prefix
, strempty(startup_cpuset_cpus
),
500 prefix
, strempty(cpuset_mems
),
501 prefix
, strempty(startup_cpuset_mems
),
502 prefix
, c
->io_weight
,
503 prefix
, c
->startup_io_weight
,
504 prefix
, c
->blockio_weight
,
505 prefix
, c
->startup_blockio_weight
,
506 prefix
, c
->default_memory_min
,
507 prefix
, c
->default_memory_low
,
508 prefix
, c
->memory_min
, format_cgroup_memory_limit_comparison(cda
, sizeof(cda
), u
, "MemoryMin"),
509 prefix
, c
->memory_low
, format_cgroup_memory_limit_comparison(cdb
, sizeof(cdb
), u
, "MemoryLow"),
510 prefix
, c
->memory_high
, format_cgroup_memory_limit_comparison(cdc
, sizeof(cdc
), u
, "MemoryHigh"),
511 prefix
, c
->memory_max
, format_cgroup_memory_limit_comparison(cdd
, sizeof(cdd
), u
, "MemoryMax"),
512 prefix
, c
->memory_swap_max
, format_cgroup_memory_limit_comparison(cde
, sizeof(cde
), u
, "MemorySwapMax"),
513 prefix
, c
->memory_limit
,
514 prefix
, tasks_max_resolve(&c
->tasks_max
),
515 prefix
, cgroup_device_policy_to_string(c
->device_policy
),
516 prefix
, strempty(disable_controllers_str
),
517 prefix
, yes_no(c
->delegate
),
518 prefix
, managed_oom_mode_to_string(c
->moom_swap
),
519 prefix
, managed_oom_mode_to_string(c
->moom_mem_pressure
),
520 prefix
, PERMYRIAD_AS_PERCENT_FORMAT_VAL(UINT32_SCALE_TO_PERMYRIAD(c
->moom_mem_pressure_limit
)),
521 prefix
, managed_oom_preference_to_string(c
->moom_preference
));
524 _cleanup_free_
char *t
= NULL
;
526 (void) cg_mask_to_string(c
->delegate_controllers
, &t
);
528 fprintf(f
, "%sDelegateControllers: %s\n",
533 LIST_FOREACH(device_allow
, a
, c
->device_allow
)
535 "%sDeviceAllow: %s %s%s%s\n",
538 a
->r
? "r" : "", a
->w
? "w" : "", a
->m
? "m" : "");
540 LIST_FOREACH(device_weights
, iw
, c
->io_device_weights
)
542 "%sIODeviceWeight: %s %" PRIu64
"\n",
547 LIST_FOREACH(device_latencies
, l
, c
->io_device_latencies
)
549 "%sIODeviceLatencyTargetSec: %s %s\n",
552 FORMAT_TIMESPAN(l
->target_usec
, 1));
554 LIST_FOREACH(device_limits
, il
, c
->io_device_limits
)
555 for (CGroupIOLimitType type
= 0; type
< _CGROUP_IO_LIMIT_TYPE_MAX
; type
++)
556 if (il
->limits
[type
] != cgroup_io_limit_defaults
[type
])
560 cgroup_io_limit_type_to_string(type
),
562 FORMAT_BYTES(il
->limits
[type
]));
564 LIST_FOREACH(device_weights
, w
, c
->blockio_device_weights
)
566 "%sBlockIODeviceWeight: %s %" PRIu64
,
571 LIST_FOREACH(device_bandwidths
, b
, c
->blockio_device_bandwidths
) {
572 if (b
->rbps
!= CGROUP_LIMIT_MAX
)
574 "%sBlockIOReadBandwidth: %s %s\n",
577 FORMAT_BYTES(b
->rbps
));
578 if (b
->wbps
!= CGROUP_LIMIT_MAX
)
580 "%sBlockIOWriteBandwidth: %s %s\n",
583 FORMAT_BYTES(b
->wbps
));
586 SET_FOREACH(iaai
, c
->ip_address_allow
) {
587 _cleanup_free_
char *k
= NULL
;
589 (void) in_addr_prefix_to_string(iaai
->family
, &iaai
->address
, iaai
->prefixlen
, &k
);
590 fprintf(f
, "%sIPAddressAllow: %s\n", prefix
, strnull(k
));
593 SET_FOREACH(iaai
, c
->ip_address_deny
) {
594 _cleanup_free_
char *k
= NULL
;
596 (void) in_addr_prefix_to_string(iaai
->family
, &iaai
->address
, iaai
->prefixlen
, &k
);
597 fprintf(f
, "%sIPAddressDeny: %s\n", prefix
, strnull(k
));
600 STRV_FOREACH(path
, c
->ip_filters_ingress
)
601 fprintf(f
, "%sIPIngressFilterPath: %s\n", prefix
, *path
);
603 STRV_FOREACH(path
, c
->ip_filters_egress
)
604 fprintf(f
, "%sIPEgressFilterPath: %s\n", prefix
, *path
);
606 LIST_FOREACH(programs
, p
, c
->bpf_foreign_programs
)
607 fprintf(f
, "%sBPFProgram: %s:%s",
608 prefix
, bpf_cgroup_attach_type_to_string(p
->attach_type
), p
->bpffs_path
);
610 if (c
->socket_bind_allow
) {
611 fprintf(f
, "%sSocketBindAllow:", prefix
);
612 LIST_FOREACH(socket_bind_items
, bi
, c
->socket_bind_allow
)
613 cgroup_context_dump_socket_bind_item(bi
, f
);
617 if (c
->socket_bind_deny
) {
618 fprintf(f
, "%sSocketBindDeny:", prefix
);
619 LIST_FOREACH(socket_bind_items
, bi
, c
->socket_bind_deny
)
620 cgroup_context_dump_socket_bind_item(bi
, f
);
624 if (c
->restrict_network_interfaces
) {
626 SET_FOREACH(iface
, c
->restrict_network_interfaces
)
627 fprintf(f
, "%sRestrictNetworkInterfaces: %s\n", prefix
, iface
);
631 void cgroup_context_dump_socket_bind_item(const CGroupSocketBindItem
*item
, FILE *f
) {
632 const char *family
, *colon1
, *protocol
= "", *colon2
= "";
634 family
= strempty(af_to_ipv4_ipv6(item
->address_family
));
635 colon1
= isempty(family
) ? "" : ":";
637 if (item
->ip_protocol
!= 0) {
638 protocol
= ip_protocol_to_tcp_udp(item
->ip_protocol
);
642 if (item
->nr_ports
== 0)
643 fprintf(f
, " %s%s%s%sany", family
, colon1
, protocol
, colon2
);
644 else if (item
->nr_ports
== 1)
645 fprintf(f
, " %s%s%s%s%" PRIu16
, family
, colon1
, protocol
, colon2
, item
->port_min
);
647 uint16_t port_max
= item
->port_min
+ item
->nr_ports
- 1;
648 fprintf(f
, " %s%s%s%s%" PRIu16
"-%" PRIu16
, family
, colon1
, protocol
, colon2
,
649 item
->port_min
, port_max
);
653 int cgroup_add_device_allow(CGroupContext
*c
, const char *dev
, const char *mode
) {
654 _cleanup_free_ CGroupDeviceAllow
*a
= NULL
;
655 _cleanup_free_
char *d
= NULL
;
659 assert(isempty(mode
) || in_charset(mode
, "rwm"));
661 a
= new(CGroupDeviceAllow
, 1);
669 *a
= (CGroupDeviceAllow
) {
671 .r
= isempty(mode
) || strchr(mode
, 'r'),
672 .w
= isempty(mode
) || strchr(mode
, 'w'),
673 .m
= isempty(mode
) || strchr(mode
, 'm'),
676 LIST_PREPEND(device_allow
, c
->device_allow
, a
);
682 int cgroup_add_bpf_foreign_program(CGroupContext
*c
, uint32_t attach_type
, const char *bpffs_path
) {
683 CGroupBPFForeignProgram
*p
;
684 _cleanup_free_
char *d
= NULL
;
689 if (!path_is_normalized(bpffs_path
) || !path_is_absolute(bpffs_path
))
690 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Path is not normalized: %m");
692 d
= strdup(bpffs_path
);
696 p
= new(CGroupBPFForeignProgram
, 1);
700 *p
= (CGroupBPFForeignProgram
) {
701 .attach_type
= attach_type
,
702 .bpffs_path
= TAKE_PTR(d
),
705 LIST_PREPEND(programs
, c
->bpf_foreign_programs
, TAKE_PTR(p
));
710 #define UNIT_DEFINE_ANCESTOR_MEMORY_LOOKUP(entry) \
711 uint64_t unit_get_ancestor_##entry(Unit *u) { \
714 /* 1. Is entry set in this unit? If so, use that. \
715 * 2. Is the default for this entry set in any \
716 * ancestor? If so, use that. \
717 * 3. Otherwise, return CGROUP_LIMIT_MIN. */ \
721 c = unit_get_cgroup_context(u); \
722 if (c && c->entry##_set) \
725 while ((u = UNIT_GET_SLICE(u))) { \
726 c = unit_get_cgroup_context(u); \
727 if (c && c->default_##entry##_set) \
728 return c->default_##entry; \
731 /* We've reached the root, but nobody had default for \
732 * this entry set, so set it to the kernel default. */ \
733 return CGROUP_LIMIT_MIN; \
736 UNIT_DEFINE_ANCESTOR_MEMORY_LOOKUP(memory_low
);
737 UNIT_DEFINE_ANCESTOR_MEMORY_LOOKUP(memory_min
);
739 void cgroup_oomd_xattr_apply(Unit
*u
, const char *cgroup_path
) {
745 c
= unit_get_cgroup_context(u
);
749 if (c
->moom_preference
== MANAGED_OOM_PREFERENCE_OMIT
) {
750 r
= cg_set_xattr(SYSTEMD_CGROUP_CONTROLLER
, cgroup_path
, "user.oomd_omit", "1", 1, 0);
752 log_unit_debug_errno(u
, r
, "Failed to set oomd_omit flag on control group %s, ignoring: %m", empty_to_root(cgroup_path
));
755 if (c
->moom_preference
== MANAGED_OOM_PREFERENCE_AVOID
) {
756 r
= cg_set_xattr(SYSTEMD_CGROUP_CONTROLLER
, cgroup_path
, "user.oomd_avoid", "1", 1, 0);
758 log_unit_debug_errno(u
, r
, "Failed to set oomd_avoid flag on control group %s, ignoring: %m", empty_to_root(cgroup_path
));
761 if (c
->moom_preference
!= MANAGED_OOM_PREFERENCE_AVOID
) {
762 r
= cg_remove_xattr(SYSTEMD_CGROUP_CONTROLLER
, cgroup_path
, "user.oomd_avoid");
763 if (r
< 0 && r
!= -ENODATA
)
764 log_unit_debug_errno(u
, r
, "Failed to remove oomd_avoid flag on control group %s, ignoring: %m", empty_to_root(cgroup_path
));
767 if (c
->moom_preference
!= MANAGED_OOM_PREFERENCE_OMIT
) {
768 r
= cg_remove_xattr(SYSTEMD_CGROUP_CONTROLLER
, cgroup_path
, "user.oomd_omit");
769 if (r
< 0 && r
!= -ENODATA
)
770 log_unit_debug_errno(u
, r
, "Failed to remove oomd_omit flag on control group %s, ignoring: %m", empty_to_root(cgroup_path
));
774 static void cgroup_xattr_apply(Unit
*u
) {
779 if (!MANAGER_IS_SYSTEM(u
->manager
))
782 if (!sd_id128_is_null(u
->invocation_id
)) {
783 r
= cg_set_xattr(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
,
784 "trusted.invocation_id",
785 SD_ID128_TO_STRING(u
->invocation_id
), 32,
788 log_unit_debug_errno(u
, r
, "Failed to set invocation ID on control group %s, ignoring: %m", empty_to_root(u
->cgroup_path
));
791 if (unit_cgroup_delegate(u
)) {
792 r
= cg_set_xattr(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
,
797 log_unit_debug_errno(u
, r
, "Failed to set delegate flag on control group %s, ignoring: %m", empty_to_root(u
->cgroup_path
));
799 r
= cg_remove_xattr(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, "trusted.delegate");
800 if (r
< 0 && r
!= -ENODATA
)
801 log_unit_debug_errno(u
, r
, "Failed to remove delegate flag on control group %s, ignoring: %m", empty_to_root(u
->cgroup_path
));
804 cgroup_oomd_xattr_apply(u
, u
->cgroup_path
);
807 static int lookup_block_device(const char *p
, dev_t
*ret
) {
815 r
= device_path_parse_major_minor(p
, &mode
, &rdev
);
816 if (r
== -ENODEV
) { /* not a parsable device node, need to go to disk */
819 if (stat(p
, &st
) < 0)
820 return log_warning_errno(errno
, "Couldn't stat device '%s': %m", p
);
826 return log_warning_errno(r
, "Failed to parse major/minor from path '%s': %m", p
);
829 return log_warning_errno(SYNTHETIC_ERRNO(ENOTBLK
),
830 "Device node '%s' is a character device, but block device needed.", p
);
833 else if (major(dev
) != 0)
834 *ret
= dev
; /* If this is not a device node then use the block device this file is stored on */
836 /* If this is btrfs, getting the backing block device is a bit harder */
837 r
= btrfs_get_block_device(p
, ret
);
839 return log_warning_errno(SYNTHETIC_ERRNO(ENODEV
),
840 "'%s' is not a block device node, and file system block device cannot be determined or is not local.", p
);
842 return log_warning_errno(r
, "Failed to determine block device backing btrfs file system '%s': %m", p
);
845 /* If this is a LUKS/DM device, recursively try to get the originating block device */
846 while (block_get_originating(*ret
, ret
) > 0);
848 /* If this is a partition, try to get the originating block device */
849 (void) block_get_whole_disk(*ret
, ret
);
853 static bool cgroup_context_has_cpu_weight(CGroupContext
*c
) {
854 return c
->cpu_weight
!= CGROUP_WEIGHT_INVALID
||
855 c
->startup_cpu_weight
!= CGROUP_WEIGHT_INVALID
;
858 static bool cgroup_context_has_cpu_shares(CGroupContext
*c
) {
859 return c
->cpu_shares
!= CGROUP_CPU_SHARES_INVALID
||
860 c
->startup_cpu_shares
!= CGROUP_CPU_SHARES_INVALID
;
863 static bool cgroup_context_has_allowed_cpus(CGroupContext
*c
) {
864 return c
->cpuset_cpus
.set
|| c
->startup_cpuset_cpus
.set
;
867 static bool cgroup_context_has_allowed_mems(CGroupContext
*c
) {
868 return c
->cpuset_mems
.set
|| c
->startup_cpuset_mems
.set
;
871 static uint64_t cgroup_context_cpu_weight(CGroupContext
*c
, ManagerState state
) {
872 if (IN_SET(state
, MANAGER_STARTING
, MANAGER_INITIALIZING
, MANAGER_STOPPING
) &&
873 c
->startup_cpu_weight
!= CGROUP_WEIGHT_INVALID
)
874 return c
->startup_cpu_weight
;
875 else if (c
->cpu_weight
!= CGROUP_WEIGHT_INVALID
)
876 return c
->cpu_weight
;
878 return CGROUP_WEIGHT_DEFAULT
;
881 static uint64_t cgroup_context_cpu_shares(CGroupContext
*c
, ManagerState state
) {
882 if (IN_SET(state
, MANAGER_STARTING
, MANAGER_INITIALIZING
, MANAGER_STOPPING
) &&
883 c
->startup_cpu_shares
!= CGROUP_CPU_SHARES_INVALID
)
884 return c
->startup_cpu_shares
;
885 else if (c
->cpu_shares
!= CGROUP_CPU_SHARES_INVALID
)
886 return c
->cpu_shares
;
888 return CGROUP_CPU_SHARES_DEFAULT
;
891 static CPUSet
*cgroup_context_allowed_cpus(CGroupContext
*c
, ManagerState state
) {
892 if (IN_SET(state
, MANAGER_STARTING
, MANAGER_INITIALIZING
, MANAGER_STOPPING
) &&
893 c
->startup_cpuset_cpus
.set
)
894 return &c
->startup_cpuset_cpus
;
896 return &c
->cpuset_cpus
;
899 static CPUSet
*cgroup_context_allowed_mems(CGroupContext
*c
, ManagerState state
) {
900 if (IN_SET(state
, MANAGER_STARTING
, MANAGER_INITIALIZING
, MANAGER_STOPPING
) &&
901 c
->startup_cpuset_mems
.set
)
902 return &c
->startup_cpuset_mems
;
904 return &c
->cpuset_mems
;
907 usec_t
cgroup_cpu_adjust_period(usec_t period
, usec_t quota
, usec_t resolution
, usec_t max_period
) {
908 /* kernel uses a minimum resolution of 1ms, so both period and (quota * period)
909 * need to be higher than that boundary. quota is specified in USecPerSec.
910 * Additionally, period must be at most max_period. */
913 return MIN(MAX3(period
, resolution
, resolution
* USEC_PER_SEC
/ quota
), max_period
);
916 static usec_t
cgroup_cpu_adjust_period_and_log(Unit
*u
, usec_t period
, usec_t quota
) {
919 if (quota
== USEC_INFINITY
)
920 /* Always use default period for infinity quota. */
921 return CGROUP_CPU_QUOTA_DEFAULT_PERIOD_USEC
;
923 if (period
== USEC_INFINITY
)
924 /* Default period was requested. */
925 period
= CGROUP_CPU_QUOTA_DEFAULT_PERIOD_USEC
;
927 /* Clamp to interval [1ms, 1s] */
928 new_period
= cgroup_cpu_adjust_period(period
, quota
, USEC_PER_MSEC
, USEC_PER_SEC
);
930 if (new_period
!= period
) {
931 log_unit_full(u
, u
->warned_clamping_cpu_quota_period
? LOG_DEBUG
: LOG_WARNING
,
932 "Clamping CPU interval for cpu.max: period is now %s",
933 FORMAT_TIMESPAN(new_period
, 1));
934 u
->warned_clamping_cpu_quota_period
= true;
940 static void cgroup_apply_unified_cpu_weight(Unit
*u
, uint64_t weight
) {
941 char buf
[DECIMAL_STR_MAX(uint64_t) + 2];
943 xsprintf(buf
, "%" PRIu64
"\n", weight
);
944 (void) set_attribute_and_warn(u
, "cpu", "cpu.weight", buf
);
947 static void cgroup_apply_unified_cpu_quota(Unit
*u
, usec_t quota
, usec_t period
) {
948 char buf
[(DECIMAL_STR_MAX(usec_t
) + 1) * 2 + 1];
950 period
= cgroup_cpu_adjust_period_and_log(u
, period
, quota
);
951 if (quota
!= USEC_INFINITY
)
952 xsprintf(buf
, USEC_FMT
" " USEC_FMT
"\n",
953 MAX(quota
* period
/ USEC_PER_SEC
, USEC_PER_MSEC
), period
);
955 xsprintf(buf
, "max " USEC_FMT
"\n", period
);
956 (void) set_attribute_and_warn(u
, "cpu", "cpu.max", buf
);
959 static void cgroup_apply_legacy_cpu_shares(Unit
*u
, uint64_t shares
) {
960 char buf
[DECIMAL_STR_MAX(uint64_t) + 2];
962 xsprintf(buf
, "%" PRIu64
"\n", shares
);
963 (void) set_attribute_and_warn(u
, "cpu", "cpu.shares", buf
);
966 static void cgroup_apply_legacy_cpu_quota(Unit
*u
, usec_t quota
, usec_t period
) {
967 char buf
[DECIMAL_STR_MAX(usec_t
) + 2];
969 period
= cgroup_cpu_adjust_period_and_log(u
, period
, quota
);
971 xsprintf(buf
, USEC_FMT
"\n", period
);
972 (void) set_attribute_and_warn(u
, "cpu", "cpu.cfs_period_us", buf
);
974 if (quota
!= USEC_INFINITY
) {
975 xsprintf(buf
, USEC_FMT
"\n", MAX(quota
* period
/ USEC_PER_SEC
, USEC_PER_MSEC
));
976 (void) set_attribute_and_warn(u
, "cpu", "cpu.cfs_quota_us", buf
);
978 (void) set_attribute_and_warn(u
, "cpu", "cpu.cfs_quota_us", "-1\n");
981 static uint64_t cgroup_cpu_shares_to_weight(uint64_t shares
) {
982 return CLAMP(shares
* CGROUP_WEIGHT_DEFAULT
/ CGROUP_CPU_SHARES_DEFAULT
,
983 CGROUP_WEIGHT_MIN
, CGROUP_WEIGHT_MAX
);
986 static uint64_t cgroup_cpu_weight_to_shares(uint64_t weight
) {
987 return CLAMP(weight
* CGROUP_CPU_SHARES_DEFAULT
/ CGROUP_WEIGHT_DEFAULT
,
988 CGROUP_CPU_SHARES_MIN
, CGROUP_CPU_SHARES_MAX
);
991 static void cgroup_apply_unified_cpuset(Unit
*u
, const CPUSet
*cpus
, const char *name
) {
992 _cleanup_free_
char *buf
= NULL
;
994 buf
= cpu_set_to_range_string(cpus
);
1000 (void) set_attribute_and_warn(u
, "cpuset", name
, buf
);
1003 static bool cgroup_context_has_io_config(CGroupContext
*c
) {
1004 return c
->io_accounting
||
1005 c
->io_weight
!= CGROUP_WEIGHT_INVALID
||
1006 c
->startup_io_weight
!= CGROUP_WEIGHT_INVALID
||
1007 c
->io_device_weights
||
1008 c
->io_device_latencies
||
1009 c
->io_device_limits
;
1012 static bool cgroup_context_has_blockio_config(CGroupContext
*c
) {
1013 return c
->blockio_accounting
||
1014 c
->blockio_weight
!= CGROUP_BLKIO_WEIGHT_INVALID
||
1015 c
->startup_blockio_weight
!= CGROUP_BLKIO_WEIGHT_INVALID
||
1016 c
->blockio_device_weights
||
1017 c
->blockio_device_bandwidths
;
1020 static uint64_t cgroup_context_io_weight(CGroupContext
*c
, ManagerState state
) {
1021 if (IN_SET(state
, MANAGER_STARTING
, MANAGER_INITIALIZING
, MANAGER_STOPPING
) &&
1022 c
->startup_io_weight
!= CGROUP_WEIGHT_INVALID
)
1023 return c
->startup_io_weight
;
1024 else if (c
->io_weight
!= CGROUP_WEIGHT_INVALID
)
1025 return c
->io_weight
;
1027 return CGROUP_WEIGHT_DEFAULT
;
1030 static uint64_t cgroup_context_blkio_weight(CGroupContext
*c
, ManagerState state
) {
1031 if (IN_SET(state
, MANAGER_STARTING
, MANAGER_INITIALIZING
, MANAGER_STOPPING
) &&
1032 c
->startup_blockio_weight
!= CGROUP_BLKIO_WEIGHT_INVALID
)
1033 return c
->startup_blockio_weight
;
1034 else if (c
->blockio_weight
!= CGROUP_BLKIO_WEIGHT_INVALID
)
1035 return c
->blockio_weight
;
1037 return CGROUP_BLKIO_WEIGHT_DEFAULT
;
1040 static uint64_t cgroup_weight_blkio_to_io(uint64_t blkio_weight
) {
1041 return CLAMP(blkio_weight
* CGROUP_WEIGHT_DEFAULT
/ CGROUP_BLKIO_WEIGHT_DEFAULT
,
1042 CGROUP_WEIGHT_MIN
, CGROUP_WEIGHT_MAX
);
1045 static uint64_t cgroup_weight_io_to_blkio(uint64_t io_weight
) {
1046 return CLAMP(io_weight
* CGROUP_BLKIO_WEIGHT_DEFAULT
/ CGROUP_WEIGHT_DEFAULT
,
1047 CGROUP_BLKIO_WEIGHT_MIN
, CGROUP_BLKIO_WEIGHT_MAX
);
1050 static void cgroup_apply_io_device_weight(Unit
*u
, const char *dev_path
, uint64_t io_weight
) {
1051 char buf
[DECIMAL_STR_MAX(dev_t
)*2+2+DECIMAL_STR_MAX(uint64_t)+1];
1055 r
= lookup_block_device(dev_path
, &dev
);
1059 xsprintf(buf
, "%u:%u %" PRIu64
"\n", major(dev
), minor(dev
), io_weight
);
1060 (void) set_attribute_and_warn(u
, "io", "io.weight", buf
);
1063 static void cgroup_apply_blkio_device_weight(Unit
*u
, const char *dev_path
, uint64_t blkio_weight
) {
1064 char buf
[DECIMAL_STR_MAX(dev_t
)*2+2+DECIMAL_STR_MAX(uint64_t)+1];
1068 r
= lookup_block_device(dev_path
, &dev
);
1072 xsprintf(buf
, "%u:%u %" PRIu64
"\n", major(dev
), minor(dev
), blkio_weight
);
1073 (void) set_attribute_and_warn(u
, "blkio", "blkio.weight_device", buf
);
1076 static void cgroup_apply_io_device_latency(Unit
*u
, const char *dev_path
, usec_t target
) {
1077 char buf
[DECIMAL_STR_MAX(dev_t
)*2+2+7+DECIMAL_STR_MAX(uint64_t)+1];
1081 r
= lookup_block_device(dev_path
, &dev
);
1085 if (target
!= USEC_INFINITY
)
1086 xsprintf(buf
, "%u:%u target=%" PRIu64
"\n", major(dev
), minor(dev
), target
);
1088 xsprintf(buf
, "%u:%u target=max\n", major(dev
), minor(dev
));
1090 (void) set_attribute_and_warn(u
, "io", "io.latency", buf
);
1093 static void cgroup_apply_io_device_limit(Unit
*u
, const char *dev_path
, uint64_t *limits
) {
1094 char limit_bufs
[_CGROUP_IO_LIMIT_TYPE_MAX
][DECIMAL_STR_MAX(uint64_t)],
1095 buf
[DECIMAL_STR_MAX(dev_t
)*2+2+(6+DECIMAL_STR_MAX(uint64_t)+1)*4];
1098 if (lookup_block_device(dev_path
, &dev
) < 0)
1101 for (CGroupIOLimitType type
= 0; type
< _CGROUP_IO_LIMIT_TYPE_MAX
; type
++)
1102 if (limits
[type
] != cgroup_io_limit_defaults
[type
])
1103 xsprintf(limit_bufs
[type
], "%" PRIu64
, limits
[type
]);
1105 xsprintf(limit_bufs
[type
], "%s", limits
[type
] == CGROUP_LIMIT_MAX
? "max" : "0");
1107 xsprintf(buf
, "%u:%u rbps=%s wbps=%s riops=%s wiops=%s\n", major(dev
), minor(dev
),
1108 limit_bufs
[CGROUP_IO_RBPS_MAX
], limit_bufs
[CGROUP_IO_WBPS_MAX
],
1109 limit_bufs
[CGROUP_IO_RIOPS_MAX
], limit_bufs
[CGROUP_IO_WIOPS_MAX
]);
1110 (void) set_attribute_and_warn(u
, "io", "io.max", buf
);
1113 static void cgroup_apply_blkio_device_limit(Unit
*u
, const char *dev_path
, uint64_t rbps
, uint64_t wbps
) {
1114 char buf
[DECIMAL_STR_MAX(dev_t
)*2+2+DECIMAL_STR_MAX(uint64_t)+1];
1117 if (lookup_block_device(dev_path
, &dev
) < 0)
1120 sprintf(buf
, "%u:%u %" PRIu64
"\n", major(dev
), minor(dev
), rbps
);
1121 (void) set_attribute_and_warn(u
, "blkio", "blkio.throttle.read_bps_device", buf
);
1123 sprintf(buf
, "%u:%u %" PRIu64
"\n", major(dev
), minor(dev
), wbps
);
1124 (void) set_attribute_and_warn(u
, "blkio", "blkio.throttle.write_bps_device", buf
);
1127 static bool unit_has_unified_memory_config(Unit
*u
) {
1132 assert_se(c
= unit_get_cgroup_context(u
));
1134 return unit_get_ancestor_memory_min(u
) > 0 || unit_get_ancestor_memory_low(u
) > 0 ||
1135 c
->memory_high
!= CGROUP_LIMIT_MAX
|| c
->memory_max
!= CGROUP_LIMIT_MAX
||
1136 c
->memory_swap_max
!= CGROUP_LIMIT_MAX
;
1139 static void cgroup_apply_unified_memory_limit(Unit
*u
, const char *file
, uint64_t v
) {
1140 char buf
[DECIMAL_STR_MAX(uint64_t) + 1] = "max\n";
1142 if (v
!= CGROUP_LIMIT_MAX
)
1143 xsprintf(buf
, "%" PRIu64
"\n", v
);
1145 (void) set_attribute_and_warn(u
, "memory", file
, buf
);
1148 static void cgroup_apply_firewall(Unit
*u
) {
1151 /* Best-effort: let's apply IP firewalling and/or accounting if that's enabled */
1153 if (bpf_firewall_compile(u
) < 0)
1156 (void) bpf_firewall_load_custom(u
);
1157 (void) bpf_firewall_install(u
);
1160 static void cgroup_apply_socket_bind(Unit
*u
) {
1163 (void) bpf_socket_bind_install(u
);
1166 static void cgroup_apply_restrict_network_interfaces(Unit
*u
) {
1169 (void) restrict_network_interfaces_install(u
);
1172 static int cgroup_apply_devices(Unit
*u
) {
1173 _cleanup_(bpf_program_freep
) BPFProgram
*prog
= NULL
;
1176 CGroupDeviceAllow
*a
;
1177 CGroupDevicePolicy policy
;
1180 assert_se(c
= unit_get_cgroup_context(u
));
1181 assert_se(path
= u
->cgroup_path
);
1183 policy
= c
->device_policy
;
1185 if (cg_all_unified() > 0) {
1186 r
= bpf_devices_cgroup_init(&prog
, policy
, c
->device_allow
);
1188 return log_unit_warning_errno(u
, r
, "Failed to initialize device control bpf program: %m");
1191 /* Changing the devices list of a populated cgroup might result in EINVAL, hence ignore
1194 if (c
->device_allow
|| policy
!= CGROUP_DEVICE_POLICY_AUTO
)
1195 r
= cg_set_attribute("devices", path
, "devices.deny", "a");
1197 r
= cg_set_attribute("devices", path
, "devices.allow", "a");
1199 log_unit_full_errno(u
, IN_SET(r
, -ENOENT
, -EROFS
, -EINVAL
, -EACCES
, -EPERM
) ? LOG_DEBUG
: LOG_WARNING
, r
,
1200 "Failed to reset devices.allow/devices.deny: %m");
1203 bool allow_list_static
= policy
== CGROUP_DEVICE_POLICY_CLOSED
||
1204 (policy
== CGROUP_DEVICE_POLICY_AUTO
&& c
->device_allow
);
1205 if (allow_list_static
)
1206 (void) bpf_devices_allow_list_static(prog
, path
);
1208 bool any
= allow_list_static
;
1209 LIST_FOREACH(device_allow
, a
, c
->device_allow
) {
1223 if (path_startswith(a
->path
, "/dev/"))
1224 r
= bpf_devices_allow_list_device(prog
, path
, a
->path
, acc
);
1225 else if ((val
= startswith(a
->path
, "block-")))
1226 r
= bpf_devices_allow_list_major(prog
, path
, val
, 'b', acc
);
1227 else if ((val
= startswith(a
->path
, "char-")))
1228 r
= bpf_devices_allow_list_major(prog
, path
, val
, 'c', acc
);
1230 log_unit_debug(u
, "Ignoring device '%s' while writing cgroup attribute.", a
->path
);
1239 log_unit_warning_errno(u
, SYNTHETIC_ERRNO(ENODEV
), "No devices matched by device filter.");
1241 /* The kernel verifier would reject a program we would build with the normal intro and outro
1242 but no allow-listing rules (outro would contain an unreachable instruction for successful
1244 policy
= CGROUP_DEVICE_POLICY_STRICT
;
1247 r
= bpf_devices_apply_policy(&prog
, policy
, any
, path
, &u
->bpf_device_control_installed
);
1249 static bool warned
= false;
1251 log_full_errno(warned
? LOG_DEBUG
: LOG_WARNING
, r
,
1252 "Unit %s configures device ACL, but the local system doesn't seem to support the BPF-based device controller.\n"
1253 "Proceeding WITHOUT applying ACL (all devices will be accessible)!\n"
1254 "(This warning is only shown for the first loaded unit using device ACL.)", u
->id
);
1261 static void set_io_weight(Unit
*u
, const char *controller
, uint64_t weight
) {
1262 char buf
[8+DECIMAL_STR_MAX(uint64_t)+1];
1265 p
= strjoina(controller
, ".weight");
1266 xsprintf(buf
, "default %" PRIu64
"\n", weight
);
1267 (void) set_attribute_and_warn(u
, controller
, p
, buf
);
1269 /* FIXME: drop this when distro kernels properly support BFQ through "io.weight"
1270 * See also: https://github.com/systemd/systemd/pull/13335 and
1271 * https://github.com/torvalds/linux/commit/65752aef0a407e1ef17ec78a7fc31ba4e0b360f9.
1272 * The range is 1..1000 apparently. */
1273 p
= strjoina(controller
, ".bfq.weight");
1274 xsprintf(buf
, "%" PRIu64
"\n", (weight
+ 9) / 10);
1275 (void) set_attribute_and_warn(u
, controller
, p
, buf
);
1278 static void cgroup_apply_bpf_foreign_program(Unit
*u
) {
1281 (void) bpf_foreign_install(u
);
1284 static void cgroup_context_apply(
1286 CGroupMask apply_mask
,
1287 ManagerState state
) {
1291 bool is_host_root
, is_local_root
;
1296 /* Nothing to do? Exit early! */
1297 if (apply_mask
== 0)
1300 /* Some cgroup attributes are not supported on the host root cgroup, hence silently ignore them here. And other
1301 * attributes should only be managed for cgroups further down the tree. */
1302 is_local_root
= unit_has_name(u
, SPECIAL_ROOT_SLICE
);
1303 is_host_root
= unit_has_host_root_cgroup(u
);
1305 assert_se(c
= unit_get_cgroup_context(u
));
1306 assert_se(path
= u
->cgroup_path
);
1308 if (is_local_root
) /* Make sure we don't try to display messages with an empty path. */
1311 /* We generally ignore errors caused by read-only mounted cgroup trees (assuming we are running in a container
1312 * then), and missing cgroups, i.e. EROFS and ENOENT. */
1314 /* In fully unified mode these attributes don't exist on the host cgroup root. On legacy the weights exist, but
1315 * setting the weight makes very little sense on the host root cgroup, as there are no other cgroups at this
1316 * level. The quota exists there too, but any attempt to write to it is refused with EINVAL. Inside of
1317 * containers we want to leave control of these to the container manager (and if cgroup v2 delegation is used
1318 * we couldn't even write to them if we wanted to). */
1319 if ((apply_mask
& CGROUP_MASK_CPU
) && !is_local_root
) {
1321 if (cg_all_unified() > 0) {
1324 if (cgroup_context_has_cpu_weight(c
))
1325 weight
= cgroup_context_cpu_weight(c
, state
);
1326 else if (cgroup_context_has_cpu_shares(c
)) {
1329 shares
= cgroup_context_cpu_shares(c
, state
);
1330 weight
= cgroup_cpu_shares_to_weight(shares
);
1332 log_cgroup_compat(u
, "Applying [Startup]CPUShares=%" PRIu64
" as [Startup]CPUWeight=%" PRIu64
" on %s",
1333 shares
, weight
, path
);
1335 weight
= CGROUP_WEIGHT_DEFAULT
;
1337 cgroup_apply_unified_cpu_weight(u
, weight
);
1338 cgroup_apply_unified_cpu_quota(u
, c
->cpu_quota_per_sec_usec
, c
->cpu_quota_period_usec
);
1343 if (cgroup_context_has_cpu_weight(c
)) {
1346 weight
= cgroup_context_cpu_weight(c
, state
);
1347 shares
= cgroup_cpu_weight_to_shares(weight
);
1349 log_cgroup_compat(u
, "Applying [Startup]CPUWeight=%" PRIu64
" as [Startup]CPUShares=%" PRIu64
" on %s",
1350 weight
, shares
, path
);
1351 } else if (cgroup_context_has_cpu_shares(c
))
1352 shares
= cgroup_context_cpu_shares(c
, state
);
1354 shares
= CGROUP_CPU_SHARES_DEFAULT
;
1356 cgroup_apply_legacy_cpu_shares(u
, shares
);
1357 cgroup_apply_legacy_cpu_quota(u
, c
->cpu_quota_per_sec_usec
, c
->cpu_quota_period_usec
);
1361 if ((apply_mask
& CGROUP_MASK_CPUSET
) && !is_local_root
) {
1362 cgroup_apply_unified_cpuset(u
, cgroup_context_allowed_cpus(c
, state
), "cpuset.cpus");
1363 cgroup_apply_unified_cpuset(u
, cgroup_context_allowed_mems(c
, state
), "cpuset.mems");
1366 /* The 'io' controller attributes are not exported on the host's root cgroup (being a pure cgroup v2
1367 * controller), and in case of containers we want to leave control of these attributes to the container manager
1368 * (and we couldn't access that stuff anyway, even if we tried if proper delegation is used). */
1369 if ((apply_mask
& CGROUP_MASK_IO
) && !is_local_root
) {
1370 bool has_io
, has_blockio
;
1373 has_io
= cgroup_context_has_io_config(c
);
1374 has_blockio
= cgroup_context_has_blockio_config(c
);
1377 weight
= cgroup_context_io_weight(c
, state
);
1378 else if (has_blockio
) {
1379 uint64_t blkio_weight
;
1381 blkio_weight
= cgroup_context_blkio_weight(c
, state
);
1382 weight
= cgroup_weight_blkio_to_io(blkio_weight
);
1384 log_cgroup_compat(u
, "Applying [Startup]BlockIOWeight=%" PRIu64
" as [Startup]IOWeight=%" PRIu64
,
1385 blkio_weight
, weight
);
1387 weight
= CGROUP_WEIGHT_DEFAULT
;
1389 set_io_weight(u
, "io", weight
);
1392 CGroupIODeviceLatency
*latency
;
1393 CGroupIODeviceLimit
*limit
;
1394 CGroupIODeviceWeight
*w
;
1396 LIST_FOREACH(device_weights
, w
, c
->io_device_weights
)
1397 cgroup_apply_io_device_weight(u
, w
->path
, w
->weight
);
1399 LIST_FOREACH(device_limits
, limit
, c
->io_device_limits
)
1400 cgroup_apply_io_device_limit(u
, limit
->path
, limit
->limits
);
1402 LIST_FOREACH(device_latencies
, latency
, c
->io_device_latencies
)
1403 cgroup_apply_io_device_latency(u
, latency
->path
, latency
->target_usec
);
1405 } else if (has_blockio
) {
1406 CGroupBlockIODeviceWeight
*w
;
1407 CGroupBlockIODeviceBandwidth
*b
;
1409 LIST_FOREACH(device_weights
, w
, c
->blockio_device_weights
) {
1410 weight
= cgroup_weight_blkio_to_io(w
->weight
);
1412 log_cgroup_compat(u
, "Applying BlockIODeviceWeight=%" PRIu64
" as IODeviceWeight=%" PRIu64
" for %s",
1413 w
->weight
, weight
, w
->path
);
1415 cgroup_apply_io_device_weight(u
, w
->path
, weight
);
1418 LIST_FOREACH(device_bandwidths
, b
, c
->blockio_device_bandwidths
) {
1419 uint64_t limits
[_CGROUP_IO_LIMIT_TYPE_MAX
];
1421 for (CGroupIOLimitType type
= 0; type
< _CGROUP_IO_LIMIT_TYPE_MAX
; type
++)
1422 limits
[type
] = cgroup_io_limit_defaults
[type
];
1424 limits
[CGROUP_IO_RBPS_MAX
] = b
->rbps
;
1425 limits
[CGROUP_IO_WBPS_MAX
] = b
->wbps
;
1427 log_cgroup_compat(u
, "Applying BlockIO{Read|Write}Bandwidth=%" PRIu64
" %" PRIu64
" as IO{Read|Write}BandwidthMax= for %s",
1428 b
->rbps
, b
->wbps
, b
->path
);
1430 cgroup_apply_io_device_limit(u
, b
->path
, limits
);
1435 if (apply_mask
& CGROUP_MASK_BLKIO
) {
1436 bool has_io
, has_blockio
;
1438 has_io
= cgroup_context_has_io_config(c
);
1439 has_blockio
= cgroup_context_has_blockio_config(c
);
1441 /* Applying a 'weight' never makes sense for the host root cgroup, and for containers this should be
1442 * left to our container manager, too. */
1443 if (!is_local_root
) {
1449 io_weight
= cgroup_context_io_weight(c
, state
);
1450 weight
= cgroup_weight_io_to_blkio(cgroup_context_io_weight(c
, state
));
1452 log_cgroup_compat(u
, "Applying [Startup]IOWeight=%" PRIu64
" as [Startup]BlockIOWeight=%" PRIu64
,
1454 } else if (has_blockio
)
1455 weight
= cgroup_context_blkio_weight(c
, state
);
1457 weight
= CGROUP_BLKIO_WEIGHT_DEFAULT
;
1459 set_io_weight(u
, "blkio", weight
);
1462 CGroupIODeviceWeight
*w
;
1464 LIST_FOREACH(device_weights
, w
, c
->io_device_weights
) {
1465 weight
= cgroup_weight_io_to_blkio(w
->weight
);
1467 log_cgroup_compat(u
, "Applying IODeviceWeight=%" PRIu64
" as BlockIODeviceWeight=%" PRIu64
" for %s",
1468 w
->weight
, weight
, w
->path
);
1470 cgroup_apply_blkio_device_weight(u
, w
->path
, weight
);
1472 } else if (has_blockio
) {
1473 CGroupBlockIODeviceWeight
*w
;
1475 LIST_FOREACH(device_weights
, w
, c
->blockio_device_weights
)
1476 cgroup_apply_blkio_device_weight(u
, w
->path
, w
->weight
);
1480 /* The bandwidth limits are something that make sense to be applied to the host's root but not container
1481 * roots, as there we want the container manager to handle it */
1482 if (is_host_root
|| !is_local_root
) {
1484 CGroupIODeviceLimit
*l
;
1486 LIST_FOREACH(device_limits
, l
, c
->io_device_limits
) {
1487 log_cgroup_compat(u
, "Applying IO{Read|Write}Bandwidth=%" PRIu64
" %" PRIu64
" as BlockIO{Read|Write}BandwidthMax= for %s",
1488 l
->limits
[CGROUP_IO_RBPS_MAX
], l
->limits
[CGROUP_IO_WBPS_MAX
], l
->path
);
1490 cgroup_apply_blkio_device_limit(u
, l
->path
, l
->limits
[CGROUP_IO_RBPS_MAX
], l
->limits
[CGROUP_IO_WBPS_MAX
]);
1492 } else if (has_blockio
) {
1493 CGroupBlockIODeviceBandwidth
*b
;
1495 LIST_FOREACH(device_bandwidths
, b
, c
->blockio_device_bandwidths
)
1496 cgroup_apply_blkio_device_limit(u
, b
->path
, b
->rbps
, b
->wbps
);
1501 /* In unified mode 'memory' attributes do not exist on the root cgroup. In legacy mode 'memory.limit_in_bytes'
1502 * exists on the root cgroup, but any writes to it are refused with EINVAL. And if we run in a container we
1503 * want to leave control to the container manager (and if proper cgroup v2 delegation is used we couldn't even
1504 * write to this if we wanted to.) */
1505 if ((apply_mask
& CGROUP_MASK_MEMORY
) && !is_local_root
) {
1507 if (cg_all_unified() > 0) {
1508 uint64_t max
, swap_max
= CGROUP_LIMIT_MAX
;
1510 if (unit_has_unified_memory_config(u
)) {
1511 max
= c
->memory_max
;
1512 swap_max
= c
->memory_swap_max
;
1514 max
= c
->memory_limit
;
1516 if (max
!= CGROUP_LIMIT_MAX
)
1517 log_cgroup_compat(u
, "Applying MemoryLimit=%" PRIu64
" as MemoryMax=", max
);
1520 cgroup_apply_unified_memory_limit(u
, "memory.min", unit_get_ancestor_memory_min(u
));
1521 cgroup_apply_unified_memory_limit(u
, "memory.low", unit_get_ancestor_memory_low(u
));
1522 cgroup_apply_unified_memory_limit(u
, "memory.high", c
->memory_high
);
1523 cgroup_apply_unified_memory_limit(u
, "memory.max", max
);
1524 cgroup_apply_unified_memory_limit(u
, "memory.swap.max", swap_max
);
1526 (void) set_attribute_and_warn(u
, "memory", "memory.oom.group", one_zero(c
->memory_oom_group
));
1529 char buf
[DECIMAL_STR_MAX(uint64_t) + 1];
1532 if (unit_has_unified_memory_config(u
)) {
1533 val
= c
->memory_max
;
1534 log_cgroup_compat(u
, "Applying MemoryMax=%" PRIi64
" as MemoryLimit=", val
);
1536 val
= c
->memory_limit
;
1538 if (val
== CGROUP_LIMIT_MAX
)
1539 strncpy(buf
, "-1\n", sizeof(buf
));
1541 xsprintf(buf
, "%" PRIu64
"\n", val
);
1543 (void) set_attribute_and_warn(u
, "memory", "memory.limit_in_bytes", buf
);
1547 /* On cgroup v2 we can apply BPF everywhere. On cgroup v1 we apply it everywhere except for the root of
1548 * containers, where we leave this to the manager */
1549 if ((apply_mask
& (CGROUP_MASK_DEVICES
| CGROUP_MASK_BPF_DEVICES
)) &&
1550 (is_host_root
|| cg_all_unified() > 0 || !is_local_root
))
1551 (void) cgroup_apply_devices(u
);
1553 if (apply_mask
& CGROUP_MASK_PIDS
) {
1556 /* So, the "pids" controller does not expose anything on the root cgroup, in order not to
1557 * replicate knobs exposed elsewhere needlessly. We abstract this away here however, and when
1558 * the knobs of the root cgroup are modified propagate this to the relevant sysctls. There's a
1559 * non-obvious asymmetry however: unlike the cgroup properties we don't really want to take
1560 * exclusive ownership of the sysctls, but we still want to honour things if the user sets
1561 * limits. Hence we employ sort of a one-way strategy: when the user sets a bounded limit
1562 * through us it counts. When the user afterwards unsets it again (i.e. sets it to unbounded)
1563 * it also counts. But if the user never set a limit through us (i.e. we are the default of
1564 * "unbounded") we leave things unmodified. For this we manage a global boolean that we turn on
1565 * the first time we set a limit. Note that this boolean is flushed out on manager reload,
1566 * which is desirable so that there's an official way to release control of the sysctl from
1567 * systemd: set the limit to unbounded and reload. */
1569 if (tasks_max_isset(&c
->tasks_max
)) {
1570 u
->manager
->sysctl_pid_max_changed
= true;
1571 r
= procfs_tasks_set_limit(tasks_max_resolve(&c
->tasks_max
));
1572 } else if (u
->manager
->sysctl_pid_max_changed
)
1573 r
= procfs_tasks_set_limit(TASKS_MAX
);
1577 log_unit_full_errno(u
, LOG_LEVEL_CGROUP_WRITE(r
), r
,
1578 "Failed to write to tasks limit sysctls: %m");
1581 /* The attribute itself is not available on the host root cgroup, and in the container case we want to
1582 * leave it for the container manager. */
1583 if (!is_local_root
) {
1584 if (tasks_max_isset(&c
->tasks_max
)) {
1585 char buf
[DECIMAL_STR_MAX(uint64_t) + 1];
1587 xsprintf(buf
, "%" PRIu64
"\n", tasks_max_resolve(&c
->tasks_max
));
1588 (void) set_attribute_and_warn(u
, "pids", "pids.max", buf
);
1590 (void) set_attribute_and_warn(u
, "pids", "pids.max", "max\n");
1594 if (apply_mask
& CGROUP_MASK_BPF_FIREWALL
)
1595 cgroup_apply_firewall(u
);
1597 if (apply_mask
& CGROUP_MASK_BPF_FOREIGN
)
1598 cgroup_apply_bpf_foreign_program(u
);
1600 if (apply_mask
& CGROUP_MASK_BPF_SOCKET_BIND
)
1601 cgroup_apply_socket_bind(u
);
1603 if (apply_mask
& CGROUP_MASK_BPF_RESTRICT_NETWORK_INTERFACES
)
1604 cgroup_apply_restrict_network_interfaces(u
);
1607 static bool unit_get_needs_bpf_firewall(Unit
*u
) {
1611 c
= unit_get_cgroup_context(u
);
1615 if (c
->ip_accounting
||
1616 !set_isempty(c
->ip_address_allow
) ||
1617 !set_isempty(c
->ip_address_deny
) ||
1618 c
->ip_filters_ingress
||
1619 c
->ip_filters_egress
)
1622 /* If any parent slice has an IP access list defined, it applies too */
1623 for (Unit
*p
= UNIT_GET_SLICE(u
); p
; p
= UNIT_GET_SLICE(p
)) {
1624 c
= unit_get_cgroup_context(p
);
1628 if (!set_isempty(c
->ip_address_allow
) ||
1629 !set_isempty(c
->ip_address_deny
))
1636 static bool unit_get_needs_bpf_foreign_program(Unit
*u
) {
1640 c
= unit_get_cgroup_context(u
);
1644 return !LIST_IS_EMPTY(c
->bpf_foreign_programs
);
1647 static bool unit_get_needs_socket_bind(Unit
*u
) {
1651 c
= unit_get_cgroup_context(u
);
1655 return c
->socket_bind_allow
|| c
->socket_bind_deny
;
1658 static bool unit_get_needs_restrict_network_interfaces(Unit
*u
) {
1662 c
= unit_get_cgroup_context(u
);
1666 return !set_isempty(c
->restrict_network_interfaces
);
1669 static CGroupMask
unit_get_cgroup_mask(Unit
*u
) {
1670 CGroupMask mask
= 0;
1675 assert_se(c
= unit_get_cgroup_context(u
));
1677 /* Figure out which controllers we need, based on the cgroup context object */
1679 if (c
->cpu_accounting
)
1680 mask
|= get_cpu_accounting_mask();
1682 if (cgroup_context_has_cpu_weight(c
) ||
1683 cgroup_context_has_cpu_shares(c
) ||
1684 c
->cpu_quota_per_sec_usec
!= USEC_INFINITY
)
1685 mask
|= CGROUP_MASK_CPU
;
1687 if (cgroup_context_has_allowed_cpus(c
) || cgroup_context_has_allowed_mems(c
))
1688 mask
|= CGROUP_MASK_CPUSET
;
1690 if (cgroup_context_has_io_config(c
) || cgroup_context_has_blockio_config(c
))
1691 mask
|= CGROUP_MASK_IO
| CGROUP_MASK_BLKIO
;
1693 if (c
->memory_accounting
||
1694 c
->memory_limit
!= CGROUP_LIMIT_MAX
||
1695 unit_has_unified_memory_config(u
))
1696 mask
|= CGROUP_MASK_MEMORY
;
1698 if (c
->device_allow
||
1699 c
->device_policy
!= CGROUP_DEVICE_POLICY_AUTO
)
1700 mask
|= CGROUP_MASK_DEVICES
| CGROUP_MASK_BPF_DEVICES
;
1702 if (c
->tasks_accounting
||
1703 tasks_max_isset(&c
->tasks_max
))
1704 mask
|= CGROUP_MASK_PIDS
;
1706 return CGROUP_MASK_EXTEND_JOINED(mask
);
1709 static CGroupMask
unit_get_bpf_mask(Unit
*u
) {
1710 CGroupMask mask
= 0;
1712 /* Figure out which controllers we need, based on the cgroup context, possibly taking into account children
1715 if (unit_get_needs_bpf_firewall(u
))
1716 mask
|= CGROUP_MASK_BPF_FIREWALL
;
1718 if (unit_get_needs_bpf_foreign_program(u
))
1719 mask
|= CGROUP_MASK_BPF_FOREIGN
;
1721 if (unit_get_needs_socket_bind(u
))
1722 mask
|= CGROUP_MASK_BPF_SOCKET_BIND
;
1724 if (unit_get_needs_restrict_network_interfaces(u
))
1725 mask
|= CGROUP_MASK_BPF_RESTRICT_NETWORK_INTERFACES
;
1730 CGroupMask
unit_get_own_mask(Unit
*u
) {
1733 /* Returns the mask of controllers the unit needs for itself. If a unit is not properly loaded, return an empty
1734 * mask, as we shouldn't reflect it in the cgroup hierarchy then. */
1736 if (u
->load_state
!= UNIT_LOADED
)
1739 c
= unit_get_cgroup_context(u
);
1743 return unit_get_cgroup_mask(u
) | unit_get_bpf_mask(u
) | unit_get_delegate_mask(u
);
1746 CGroupMask
unit_get_delegate_mask(Unit
*u
) {
1749 /* If delegation is turned on, then turn on selected controllers, unless we are on the legacy hierarchy and the
1750 * process we fork into is known to drop privileges, and hence shouldn't get access to the controllers.
1752 * Note that on the unified hierarchy it is safe to delegate controllers to unprivileged services. */
1754 if (!unit_cgroup_delegate(u
))
1757 if (cg_all_unified() <= 0) {
1760 e
= unit_get_exec_context(u
);
1761 if (e
&& !exec_context_maintains_privileges(e
))
1765 assert_se(c
= unit_get_cgroup_context(u
));
1766 return CGROUP_MASK_EXTEND_JOINED(c
->delegate_controllers
);
1769 static CGroupMask
unit_get_subtree_mask(Unit
*u
) {
1771 /* Returns the mask of this subtree, meaning of the group
1772 * itself and its children. */
1774 return unit_get_own_mask(u
) | unit_get_members_mask(u
);
1777 CGroupMask
unit_get_members_mask(Unit
*u
) {
1780 /* Returns the mask of controllers all of the unit's children require, merged */
1782 if (u
->cgroup_members_mask_valid
)
1783 return u
->cgroup_members_mask
; /* Use cached value if possible */
1785 u
->cgroup_members_mask
= 0;
1787 if (u
->type
== UNIT_SLICE
) {
1790 UNIT_FOREACH_DEPENDENCY(member
, u
, UNIT_ATOM_SLICE_OF
)
1791 u
->cgroup_members_mask
|= unit_get_subtree_mask(member
); /* note that this calls ourselves again, for the children */
1794 u
->cgroup_members_mask_valid
= true;
1795 return u
->cgroup_members_mask
;
1798 CGroupMask
unit_get_siblings_mask(Unit
*u
) {
1802 /* Returns the mask of controllers all of the unit's siblings
1803 * require, i.e. the members mask of the unit's parent slice
1804 * if there is one. */
1806 slice
= UNIT_GET_SLICE(u
);
1808 return unit_get_members_mask(slice
);
1810 return unit_get_subtree_mask(u
); /* we are the top-level slice */
1813 static CGroupMask
unit_get_disable_mask(Unit
*u
) {
1816 c
= unit_get_cgroup_context(u
);
1820 return c
->disable_controllers
;
1823 CGroupMask
unit_get_ancestor_disable_mask(Unit
*u
) {
1828 mask
= unit_get_disable_mask(u
);
1830 /* Returns the mask of controllers which are marked as forcibly
1831 * disabled in any ancestor unit or the unit in question. */
1833 slice
= UNIT_GET_SLICE(u
);
1835 mask
|= unit_get_ancestor_disable_mask(slice
);
1840 CGroupMask
unit_get_target_mask(Unit
*u
) {
1841 CGroupMask own_mask
, mask
;
1843 /* This returns the cgroup mask of all controllers to enable for a specific cgroup, i.e. everything
1844 * it needs itself, plus all that its children need, plus all that its siblings need. This is
1845 * primarily useful on the legacy cgroup hierarchy, where we need to duplicate each cgroup in each
1846 * hierarchy that shall be enabled for it. */
1848 own_mask
= unit_get_own_mask(u
);
1850 if (own_mask
& CGROUP_MASK_BPF_FIREWALL
& ~u
->manager
->cgroup_supported
)
1851 emit_bpf_firewall_warning(u
);
1853 mask
= own_mask
| unit_get_members_mask(u
) | unit_get_siblings_mask(u
);
1855 mask
&= u
->manager
->cgroup_supported
;
1856 mask
&= ~unit_get_ancestor_disable_mask(u
);
1861 CGroupMask
unit_get_enable_mask(Unit
*u
) {
1864 /* This returns the cgroup mask of all controllers to enable
1865 * for the children of a specific cgroup. This is primarily
1866 * useful for the unified cgroup hierarchy, where each cgroup
1867 * controls which controllers are enabled for its children. */
1869 mask
= unit_get_members_mask(u
);
1870 mask
&= u
->manager
->cgroup_supported
;
1871 mask
&= ~unit_get_ancestor_disable_mask(u
);
1876 void unit_invalidate_cgroup_members_masks(Unit
*u
) {
1881 /* Recurse invalidate the member masks cache all the way up the tree */
1882 u
->cgroup_members_mask_valid
= false;
1884 slice
= UNIT_GET_SLICE(u
);
1886 unit_invalidate_cgroup_members_masks(slice
);
1889 const char *unit_get_realized_cgroup_path(Unit
*u
, CGroupMask mask
) {
1891 /* Returns the realized cgroup path of the specified unit where all specified controllers are available. */
1895 if (u
->cgroup_path
&&
1896 u
->cgroup_realized
&&
1897 FLAGS_SET(u
->cgroup_realized_mask
, mask
))
1898 return u
->cgroup_path
;
1900 u
= UNIT_GET_SLICE(u
);
1906 static const char *migrate_callback(CGroupMask mask
, void *userdata
) {
1907 /* If not realized at all, migrate to root ("").
1908 * It may happen if we're upgrading from older version that didn't clean up.
1910 return strempty(unit_get_realized_cgroup_path(userdata
, mask
));
1913 char *unit_default_cgroup_path(const Unit
*u
) {
1914 _cleanup_free_
char *escaped
= NULL
, *slice_path
= NULL
;
1920 if (unit_has_name(u
, SPECIAL_ROOT_SLICE
))
1921 return strdup(u
->manager
->cgroup_root
);
1923 slice
= UNIT_GET_SLICE(u
);
1924 if (slice
&& !unit_has_name(slice
, SPECIAL_ROOT_SLICE
)) {
1925 r
= cg_slice_to_path(slice
->id
, &slice_path
);
1930 escaped
= cg_escape(u
->id
);
1934 return path_join(empty_to_root(u
->manager
->cgroup_root
), slice_path
, escaped
);
1937 int unit_set_cgroup_path(Unit
*u
, const char *path
) {
1938 _cleanup_free_
char *p
= NULL
;
1943 if (streq_ptr(u
->cgroup_path
, path
))
1953 r
= hashmap_put(u
->manager
->cgroup_unit
, p
, u
);
1958 unit_release_cgroup(u
);
1959 u
->cgroup_path
= TAKE_PTR(p
);
1964 int unit_watch_cgroup(Unit
*u
) {
1965 _cleanup_free_
char *events
= NULL
;
1970 /* Watches the "cgroups.events" attribute of this unit's cgroup for "empty" events, but only if
1971 * cgroupv2 is available. */
1973 if (!u
->cgroup_path
)
1976 if (u
->cgroup_control_inotify_wd
>= 0)
1979 /* Only applies to the unified hierarchy */
1980 r
= cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER
);
1982 return log_error_errno(r
, "Failed to determine whether the name=systemd hierarchy is unified: %m");
1986 /* No point in watch the top-level slice, it's never going to run empty. */
1987 if (unit_has_name(u
, SPECIAL_ROOT_SLICE
))
1990 r
= hashmap_ensure_allocated(&u
->manager
->cgroup_control_inotify_wd_unit
, &trivial_hash_ops
);
1994 r
= cg_get_path(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, "cgroup.events", &events
);
1998 u
->cgroup_control_inotify_wd
= inotify_add_watch(u
->manager
->cgroup_inotify_fd
, events
, IN_MODIFY
);
1999 if (u
->cgroup_control_inotify_wd
< 0) {
2001 if (errno
== ENOENT
) /* If the directory is already gone we don't need to track it, so this
2002 * is not an error */
2005 return log_unit_error_errno(u
, errno
, "Failed to add control inotify watch descriptor for control group %s: %m", empty_to_root(u
->cgroup_path
));
2008 r
= hashmap_put(u
->manager
->cgroup_control_inotify_wd_unit
, INT_TO_PTR(u
->cgroup_control_inotify_wd
), u
);
2010 return log_unit_error_errno(u
, r
, "Failed to add control inotify watch descriptor for control group %s to hash map: %m", empty_to_root(u
->cgroup_path
));
2015 int unit_watch_cgroup_memory(Unit
*u
) {
2016 _cleanup_free_
char *events
= NULL
;
2022 /* Watches the "memory.events" attribute of this unit's cgroup for "oom_kill" events, but only if
2023 * cgroupv2 is available. */
2025 if (!u
->cgroup_path
)
2028 c
= unit_get_cgroup_context(u
);
2032 /* The "memory.events" attribute is only available if the memory controller is on. Let's hence tie
2033 * this to memory accounting, in a way watching for OOM kills is a form of memory accounting after
2035 if (!c
->memory_accounting
)
2038 /* Don't watch inner nodes, as the kernel doesn't report oom_kill events recursively currently, and
2039 * we also don't want to generate a log message for each parent cgroup of a process. */
2040 if (u
->type
== UNIT_SLICE
)
2043 if (u
->cgroup_memory_inotify_wd
>= 0)
2046 /* Only applies to the unified hierarchy */
2047 r
= cg_all_unified();
2049 return log_error_errno(r
, "Failed to determine whether the memory controller is unified: %m");
2053 r
= hashmap_ensure_allocated(&u
->manager
->cgroup_memory_inotify_wd_unit
, &trivial_hash_ops
);
2057 r
= cg_get_path(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, "memory.events", &events
);
2061 u
->cgroup_memory_inotify_wd
= inotify_add_watch(u
->manager
->cgroup_inotify_fd
, events
, IN_MODIFY
);
2062 if (u
->cgroup_memory_inotify_wd
< 0) {
2064 if (errno
== ENOENT
) /* If the directory is already gone we don't need to track it, so this
2065 * is not an error */
2068 return log_unit_error_errno(u
, errno
, "Failed to add memory inotify watch descriptor for control group %s: %m", empty_to_root(u
->cgroup_path
));
2071 r
= hashmap_put(u
->manager
->cgroup_memory_inotify_wd_unit
, INT_TO_PTR(u
->cgroup_memory_inotify_wd
), u
);
2073 return log_unit_error_errno(u
, r
, "Failed to add memory inotify watch descriptor for control group %s to hash map: %m", empty_to_root(u
->cgroup_path
));
2078 int unit_pick_cgroup_path(Unit
*u
) {
2079 _cleanup_free_
char *path
= NULL
;
2087 if (!UNIT_HAS_CGROUP_CONTEXT(u
))
2090 path
= unit_default_cgroup_path(u
);
2094 r
= unit_set_cgroup_path(u
, path
);
2096 return log_unit_error_errno(u
, r
, "Control group %s exists already.", empty_to_root(path
));
2098 return log_unit_error_errno(u
, r
, "Failed to set unit's control group path to %s: %m", empty_to_root(path
));
2103 static int unit_update_cgroup(
2105 CGroupMask target_mask
,
2106 CGroupMask enable_mask
,
2107 ManagerState state
) {
2109 bool created
, is_root_slice
;
2110 CGroupMask migrate_mask
= 0;
2111 _cleanup_free_
char *cgroup_full_path
= NULL
;
2112 uint64_t cgroup_id
= 0;
2117 if (!UNIT_HAS_CGROUP_CONTEXT(u
))
2120 /* Figure out our cgroup path */
2121 r
= unit_pick_cgroup_path(u
);
2125 /* First, create our own group */
2126 r
= cg_create_everywhere(u
->manager
->cgroup_supported
, target_mask
, u
->cgroup_path
);
2128 return log_unit_error_errno(u
, r
, "Failed to create cgroup %s: %m", empty_to_root(u
->cgroup_path
));
2131 if (cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER
) > 0) {
2132 r
= cg_get_path(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, NULL
, &cgroup_full_path
);
2134 r
= cg_path_get_cgroupid(cgroup_full_path
, &cgroup_id
);
2136 log_unit_warning_errno(u
, r
, "Failed to get cgroup ID on cgroup %s, ignoring: %m", cgroup_full_path
);
2138 log_unit_warning_errno(u
, r
, "Failed to get full cgroup path on cgroup %s, ignoring: %m", empty_to_root(u
->cgroup_path
));
2140 u
->cgroup_id
= cgroup_id
;
2143 /* Start watching it */
2144 (void) unit_watch_cgroup(u
);
2145 (void) unit_watch_cgroup_memory(u
);
2148 /* For v2 we preserve enabled controllers in delegated units, adjust others,
2149 * for v1 we figure out which controller hierarchies need migration. */
2150 if (created
|| !u
->cgroup_realized
|| !unit_cgroup_delegate(u
)) {
2151 CGroupMask result_mask
= 0;
2153 /* Enable all controllers we need */
2154 r
= cg_enable_everywhere(u
->manager
->cgroup_supported
, enable_mask
, u
->cgroup_path
, &result_mask
);
2156 log_unit_warning_errno(u
, r
, "Failed to enable/disable controllers on cgroup %s, ignoring: %m", empty_to_root(u
->cgroup_path
));
2158 /* Remember what's actually enabled now */
2159 u
->cgroup_enabled_mask
= result_mask
;
2161 migrate_mask
= u
->cgroup_realized_mask
^ target_mask
;
2164 /* Keep track that this is now realized */
2165 u
->cgroup_realized
= true;
2166 u
->cgroup_realized_mask
= target_mask
;
2168 /* Migrate processes in controller hierarchies both downwards (enabling) and upwards (disabling).
2170 * Unnecessary controller cgroups are trimmed (after emptied by upward migration).
2171 * We perform migration also with whole slices for cases when users don't care about leave
2172 * granularity. Since delegated_mask is subset of target mask, we won't trim slice subtree containing
2175 if (cg_all_unified() == 0) {
2176 r
= cg_migrate_v1_controllers(u
->manager
->cgroup_supported
, migrate_mask
, u
->cgroup_path
, migrate_callback
, u
);
2178 log_unit_warning_errno(u
, r
, "Failed to migrate controller cgroups from %s, ignoring: %m", empty_to_root(u
->cgroup_path
));
2180 is_root_slice
= unit_has_name(u
, SPECIAL_ROOT_SLICE
);
2181 r
= cg_trim_v1_controllers(u
->manager
->cgroup_supported
, ~target_mask
, u
->cgroup_path
, !is_root_slice
);
2183 log_unit_warning_errno(u
, r
, "Failed to delete controller cgroups %s, ignoring: %m", empty_to_root(u
->cgroup_path
));
2186 /* Set attributes */
2187 cgroup_context_apply(u
, target_mask
, state
);
2188 cgroup_xattr_apply(u
);
2193 static int unit_attach_pid_to_cgroup_via_bus(Unit
*u
, pid_t pid
, const char *suffix_path
) {
2194 _cleanup_(sd_bus_error_free
) sd_bus_error error
= SD_BUS_ERROR_NULL
;
2200 if (MANAGER_IS_SYSTEM(u
->manager
))
2203 if (!u
->manager
->system_bus
)
2206 if (!u
->cgroup_path
)
2209 /* Determine this unit's cgroup path relative to our cgroup root */
2210 pp
= path_startswith(u
->cgroup_path
, u
->manager
->cgroup_root
);
2214 pp
= strjoina("/", pp
, suffix_path
);
2217 r
= sd_bus_call_method(u
->manager
->system_bus
,
2218 "org.freedesktop.systemd1",
2219 "/org/freedesktop/systemd1",
2220 "org.freedesktop.systemd1.Manager",
2221 "AttachProcessesToUnit",
2224 NULL
/* empty unit name means client's unit, i.e. us */, pp
, 1, (uint32_t) pid
);
2226 return log_unit_debug_errno(u
, r
, "Failed to attach unit process " PID_FMT
" via the bus: %s", pid
, bus_error_message(&error
, r
));
2231 int unit_attach_pids_to_cgroup(Unit
*u
, Set
*pids
, const char *suffix_path
) {
2232 CGroupMask delegated_mask
;
2239 if (!UNIT_HAS_CGROUP_CONTEXT(u
))
2242 if (set_isempty(pids
))
2245 /* Load any custom firewall BPF programs here once to test if they are existing and actually loadable.
2246 * Fail here early since later errors in the call chain unit_realize_cgroup to cgroup_context_apply are ignored. */
2247 r
= bpf_firewall_load_custom(u
);
2251 r
= unit_realize_cgroup(u
);
2255 if (isempty(suffix_path
))
2258 p
= prefix_roota(u
->cgroup_path
, suffix_path
);
2260 delegated_mask
= unit_get_delegate_mask(u
);
2263 SET_FOREACH(pidp
, pids
) {
2264 pid_t pid
= PTR_TO_PID(pidp
);
2266 /* First, attach the PID to the main cgroup hierarchy */
2267 q
= cg_attach(SYSTEMD_CGROUP_CONTROLLER
, p
, pid
);
2269 bool again
= MANAGER_IS_USER(u
->manager
) && ERRNO_IS_PRIVILEGE(q
);
2271 log_unit_full_errno(u
, again
? LOG_DEBUG
: LOG_INFO
, q
,
2272 "Couldn't move process "PID_FMT
" to%s requested cgroup '%s': %m",
2273 pid
, again
? " directly" : "", empty_to_root(p
));
2278 /* If we are in a user instance, and we can't move the process ourselves due
2279 * to permission problems, let's ask the system instance about it instead.
2280 * Since it's more privileged it might be able to move the process across the
2281 * leaves of a subtree whose top node is not owned by us. */
2283 z
= unit_attach_pid_to_cgroup_via_bus(u
, pid
, suffix_path
);
2285 log_unit_info_errno(u
, z
, "Couldn't move process "PID_FMT
" to requested cgroup '%s' (directly or via the system bus): %m", pid
, empty_to_root(p
));
2287 continue; /* When the bus thing worked via the bus we are fully done for this PID. */
2291 r
= q
; /* Remember first error */
2296 q
= cg_all_unified();
2302 /* In the legacy hierarchy, attach the process to the request cgroup if possible, and if not to the
2303 * innermost realized one */
2305 for (CGroupController c
= 0; c
< _CGROUP_CONTROLLER_MAX
; c
++) {
2306 CGroupMask bit
= CGROUP_CONTROLLER_TO_MASK(c
);
2307 const char *realized
;
2309 if (!(u
->manager
->cgroup_supported
& bit
))
2312 /* If this controller is delegated and realized, honour the caller's request for the cgroup suffix. */
2313 if (delegated_mask
& u
->cgroup_realized_mask
& bit
) {
2314 q
= cg_attach(cgroup_controller_to_string(c
), p
, pid
);
2316 continue; /* Success! */
2318 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",
2319 pid
, empty_to_root(p
), cgroup_controller_to_string(c
));
2322 /* So this controller is either not delegate or realized, or something else weird happened. In
2323 * that case let's attach the PID at least to the closest cgroup up the tree that is
2325 realized
= unit_get_realized_cgroup_path(u
, bit
);
2327 continue; /* Not even realized in the root slice? Then let's not bother */
2329 q
= cg_attach(cgroup_controller_to_string(c
), realized
, pid
);
2331 log_unit_debug_errno(u
, q
, "Failed to attach PID " PID_FMT
" to realized cgroup %s in controller %s, ignoring: %m",
2332 pid
, realized
, cgroup_controller_to_string(c
));
2339 static bool unit_has_mask_realized(
2341 CGroupMask target_mask
,
2342 CGroupMask enable_mask
) {
2346 /* Returns true if this unit is fully realized. We check four things:
2348 * 1. Whether the cgroup was created at all
2349 * 2. Whether the cgroup was created in all the hierarchies we need it to be created in (in case of cgroup v1)
2350 * 3. Whether the cgroup has all the right controllers enabled (in case of cgroup v2)
2351 * 4. Whether the invalidation mask is currently zero
2353 * If you wonder why we mask the target realization and enable mask with CGROUP_MASK_V1/CGROUP_MASK_V2: note
2354 * that there are three sets of bitmasks: CGROUP_MASK_V1 (for real cgroup v1 controllers), CGROUP_MASK_V2 (for
2355 * real cgroup v2 controllers) and CGROUP_MASK_BPF (for BPF-based pseudo-controllers). Now, cgroup_realized_mask
2356 * is only matters for cgroup v1 controllers, and cgroup_enabled_mask only used for cgroup v2, and if they
2357 * differ in the others, we don't really care. (After all, the cgroup_enabled_mask tracks with controllers are
2358 * enabled through cgroup.subtree_control, and since the BPF pseudo-controllers don't show up there, they
2359 * simply don't matter. */
2361 return u
->cgroup_realized
&&
2362 ((u
->cgroup_realized_mask
^ target_mask
) & CGROUP_MASK_V1
) == 0 &&
2363 ((u
->cgroup_enabled_mask
^ enable_mask
) & CGROUP_MASK_V2
) == 0 &&
2364 u
->cgroup_invalidated_mask
== 0;
2367 static bool unit_has_mask_disables_realized(
2369 CGroupMask target_mask
,
2370 CGroupMask enable_mask
) {
2374 /* Returns true if all controllers which should be disabled are indeed disabled.
2376 * Unlike unit_has_mask_realized, we don't care what was enabled, only that anything we want to remove is
2377 * already removed. */
2379 return !u
->cgroup_realized
||
2380 (FLAGS_SET(u
->cgroup_realized_mask
, target_mask
& CGROUP_MASK_V1
) &&
2381 FLAGS_SET(u
->cgroup_enabled_mask
, enable_mask
& CGROUP_MASK_V2
));
2384 static bool unit_has_mask_enables_realized(
2386 CGroupMask target_mask
,
2387 CGroupMask enable_mask
) {
2391 /* Returns true if all controllers which should be enabled are indeed enabled.
2393 * Unlike unit_has_mask_realized, we don't care about the controllers that are not present, only that anything
2394 * we want to add is already added. */
2396 return u
->cgroup_realized
&&
2397 ((u
->cgroup_realized_mask
| target_mask
) & CGROUP_MASK_V1
) == (u
->cgroup_realized_mask
& CGROUP_MASK_V1
) &&
2398 ((u
->cgroup_enabled_mask
| enable_mask
) & CGROUP_MASK_V2
) == (u
->cgroup_enabled_mask
& CGROUP_MASK_V2
);
2401 static void unit_add_to_cgroup_realize_queue(Unit
*u
) {
2404 if (u
->in_cgroup_realize_queue
)
2407 LIST_APPEND(cgroup_realize_queue
, u
->manager
->cgroup_realize_queue
, u
);
2408 u
->in_cgroup_realize_queue
= true;
2411 static void unit_remove_from_cgroup_realize_queue(Unit
*u
) {
2414 if (!u
->in_cgroup_realize_queue
)
2417 LIST_REMOVE(cgroup_realize_queue
, u
->manager
->cgroup_realize_queue
, u
);
2418 u
->in_cgroup_realize_queue
= false;
2421 /* Controllers can only be enabled breadth-first, from the root of the
2422 * hierarchy downwards to the unit in question. */
2423 static int unit_realize_cgroup_now_enable(Unit
*u
, ManagerState state
) {
2424 CGroupMask target_mask
, enable_mask
, new_target_mask
, new_enable_mask
;
2430 /* First go deal with this unit's parent, or we won't be able to enable
2431 * any new controllers at this layer. */
2432 slice
= UNIT_GET_SLICE(u
);
2434 r
= unit_realize_cgroup_now_enable(slice
, state
);
2439 target_mask
= unit_get_target_mask(u
);
2440 enable_mask
= unit_get_enable_mask(u
);
2442 /* We can only enable in this direction, don't try to disable anything.
2444 if (unit_has_mask_enables_realized(u
, target_mask
, enable_mask
))
2447 new_target_mask
= u
->cgroup_realized_mask
| target_mask
;
2448 new_enable_mask
= u
->cgroup_enabled_mask
| enable_mask
;
2450 return unit_update_cgroup(u
, new_target_mask
, new_enable_mask
, state
);
2453 /* Controllers can only be disabled depth-first, from the leaves of the
2454 * hierarchy upwards to the unit in question. */
2455 static int unit_realize_cgroup_now_disable(Unit
*u
, ManagerState state
) {
2460 if (u
->type
!= UNIT_SLICE
)
2463 UNIT_FOREACH_DEPENDENCY(m
, u
, UNIT_ATOM_SLICE_OF
) {
2464 CGroupMask target_mask
, enable_mask
, new_target_mask
, new_enable_mask
;
2467 /* The cgroup for this unit might not actually be fully realised yet, in which case it isn't
2468 * holding any controllers open anyway. */
2469 if (!m
->cgroup_realized
)
2472 /* We must disable those below us first in order to release the controller. */
2473 if (m
->type
== UNIT_SLICE
)
2474 (void) unit_realize_cgroup_now_disable(m
, state
);
2476 target_mask
= unit_get_target_mask(m
);
2477 enable_mask
= unit_get_enable_mask(m
);
2479 /* We can only disable in this direction, don't try to enable anything. */
2480 if (unit_has_mask_disables_realized(m
, target_mask
, enable_mask
))
2483 new_target_mask
= m
->cgroup_realized_mask
& target_mask
;
2484 new_enable_mask
= m
->cgroup_enabled_mask
& enable_mask
;
2486 r
= unit_update_cgroup(m
, new_target_mask
, new_enable_mask
, state
);
2494 /* Check if necessary controllers and attributes for a unit are in place.
2496 * - If so, do nothing.
2497 * - If not, create paths, move processes over, and set attributes.
2499 * Controllers can only be *enabled* in a breadth-first way, and *disabled* in
2500 * a depth-first way. As such the process looks like this:
2502 * Suppose we have a cgroup hierarchy which looks like this:
2515 * 1. We want to realise cgroup "d" now.
2516 * 2. cgroup "a" has DisableControllers=cpu in the associated unit.
2517 * 3. cgroup "k" just started requesting the memory controller.
2519 * To make this work we must do the following in order:
2521 * 1. Disable CPU controller in k, j
2522 * 2. Disable CPU controller in d
2523 * 3. Enable memory controller in root
2524 * 4. Enable memory controller in a
2525 * 5. Enable memory controller in d
2526 * 6. Enable memory controller in k
2528 * Notice that we need to touch j in one direction, but not the other. We also
2529 * don't go beyond d when disabling -- it's up to "a" to get realized if it
2530 * wants to disable further. The basic rules are therefore:
2532 * - If you're disabling something, you need to realise all of the cgroups from
2533 * your recursive descendants to the root. This starts from the leaves.
2534 * - If you're enabling something, you need to realise from the root cgroup
2535 * downwards, but you don't need to iterate your recursive descendants.
2537 * Returns 0 on success and < 0 on failure. */
2538 static int unit_realize_cgroup_now(Unit
*u
, ManagerState state
) {
2539 CGroupMask target_mask
, enable_mask
;
2545 unit_remove_from_cgroup_realize_queue(u
);
2547 target_mask
= unit_get_target_mask(u
);
2548 enable_mask
= unit_get_enable_mask(u
);
2550 if (unit_has_mask_realized(u
, target_mask
, enable_mask
))
2553 /* Disable controllers below us, if there are any */
2554 r
= unit_realize_cgroup_now_disable(u
, state
);
2558 /* Enable controllers above us, if there are any */
2559 slice
= UNIT_GET_SLICE(u
);
2561 r
= unit_realize_cgroup_now_enable(slice
, state
);
2566 /* Now actually deal with the cgroup we were trying to realise and set attributes */
2567 r
= unit_update_cgroup(u
, target_mask
, enable_mask
, state
);
2571 /* Now, reset the invalidation mask */
2572 u
->cgroup_invalidated_mask
= 0;
2576 unsigned manager_dispatch_cgroup_realize_queue(Manager
*m
) {
2584 state
= manager_state(m
);
2586 while ((i
= m
->cgroup_realize_queue
)) {
2587 assert(i
->in_cgroup_realize_queue
);
2589 if (UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(i
))) {
2590 /* Maybe things changed, and the unit is not actually active anymore? */
2591 unit_remove_from_cgroup_realize_queue(i
);
2595 r
= unit_realize_cgroup_now(i
, state
);
2597 log_warning_errno(r
, "Failed to realize cgroups for queued unit %s, ignoring: %m", i
->id
);
2605 void unit_add_family_to_cgroup_realize_queue(Unit
*u
) {
2607 assert(u
->type
== UNIT_SLICE
);
2609 /* Family of a unit for is defined as (immediate) children of the unit and immediate children of all
2612 * Ideally we would enqueue ancestor path only (bottom up). However, on cgroup-v1 scheduling becomes
2613 * very weird if two units that own processes reside in the same slice, but one is realized in the
2614 * "cpu" hierarchy and one is not (for example because one has CPUWeight= set and the other does
2615 * not), because that means individual processes need to be scheduled against whole cgroups. Let's
2616 * avoid this asymmetry by always ensuring that siblings of a unit are always realized in their v1
2617 * controller hierarchies too (if unit requires the controller to be realized).
2619 * The function must invalidate cgroup_members_mask of all ancestors in order to calculate up to date
2625 /* Children of u likely changed when we're called */
2626 u
->cgroup_members_mask_valid
= false;
2628 UNIT_FOREACH_DEPENDENCY(m
, u
, UNIT_ATOM_SLICE_OF
) {
2630 /* No point in doing cgroup application for units without active processes. */
2631 if (UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(m
)))
2634 /* We only enqueue siblings if they were realized once at least, in the main
2636 if (!m
->cgroup_realized
)
2639 /* If the unit doesn't need any new controllers and has current ones
2640 * realized, it doesn't need any changes. */
2641 if (unit_has_mask_realized(m
,
2642 unit_get_target_mask(m
),
2643 unit_get_enable_mask(m
)))
2646 unit_add_to_cgroup_realize_queue(m
);
2649 /* Parent comes after children */
2650 unit_add_to_cgroup_realize_queue(u
);
2652 u
= UNIT_GET_SLICE(u
);
2656 int unit_realize_cgroup(Unit
*u
) {
2661 if (!UNIT_HAS_CGROUP_CONTEXT(u
))
2664 /* So, here's the deal: when realizing the cgroups for this unit, we need to first create all
2665 * parents, but there's more actually: for the weight-based controllers we also need to make sure
2666 * that all our siblings (i.e. units that are in the same slice as we are) have cgroups, too. On the
2667 * other hand, when a controller is removed from realized set, it may become unnecessary in siblings
2668 * and ancestors and they should be (de)realized too.
2670 * This call will defer work on the siblings and derealized ancestors to the next event loop
2671 * iteration and synchronously creates the parent cgroups (unit_realize_cgroup_now). */
2673 slice
= UNIT_GET_SLICE(u
);
2675 unit_add_family_to_cgroup_realize_queue(slice
);
2677 /* And realize this one now (and apply the values) */
2678 return unit_realize_cgroup_now(u
, manager_state(u
->manager
));
2681 void unit_release_cgroup(Unit
*u
) {
2684 /* Forgets all cgroup details for this cgroup — but does *not* destroy the cgroup. This is hence OK to call
2685 * when we close down everything for reexecution, where we really want to leave the cgroup in place. */
2687 if (u
->cgroup_path
) {
2688 (void) hashmap_remove(u
->manager
->cgroup_unit
, u
->cgroup_path
);
2689 u
->cgroup_path
= mfree(u
->cgroup_path
);
2692 if (u
->cgroup_control_inotify_wd
>= 0) {
2693 if (inotify_rm_watch(u
->manager
->cgroup_inotify_fd
, u
->cgroup_control_inotify_wd
) < 0)
2694 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
);
2696 (void) hashmap_remove(u
->manager
->cgroup_control_inotify_wd_unit
, INT_TO_PTR(u
->cgroup_control_inotify_wd
));
2697 u
->cgroup_control_inotify_wd
= -1;
2700 if (u
->cgroup_memory_inotify_wd
>= 0) {
2701 if (inotify_rm_watch(u
->manager
->cgroup_inotify_fd
, u
->cgroup_memory_inotify_wd
) < 0)
2702 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
);
2704 (void) hashmap_remove(u
->manager
->cgroup_memory_inotify_wd_unit
, INT_TO_PTR(u
->cgroup_memory_inotify_wd
));
2705 u
->cgroup_memory_inotify_wd
= -1;
2709 bool unit_maybe_release_cgroup(Unit
*u
) {
2714 if (!u
->cgroup_path
)
2717 /* Don't release the cgroup if there are still processes under it. If we get notified later when all the
2718 * processes exit (e.g. the processes were in D-state and exited after the unit was marked as failed)
2719 * we need the cgroup paths to continue to be tracked by the manager so they can be looked up and cleaned
2721 r
= cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
);
2723 log_unit_debug_errno(u
, r
, "Error checking if the cgroup is recursively empty, ignoring: %m");
2725 unit_release_cgroup(u
);
2732 void unit_prune_cgroup(Unit
*u
) {
2738 /* Removes the cgroup, if empty and possible, and stops watching it. */
2740 if (!u
->cgroup_path
)
2743 (void) unit_get_cpu_usage(u
, NULL
); /* Cache the last CPU usage value before we destroy the cgroup */
2746 (void) lsm_bpf_cleanup(u
); /* Remove cgroup from the global LSM BPF map */
2749 is_root_slice
= unit_has_name(u
, SPECIAL_ROOT_SLICE
);
2751 r
= cg_trim_everywhere(u
->manager
->cgroup_supported
, u
->cgroup_path
, !is_root_slice
);
2753 /* One reason we could have failed here is, that the cgroup still contains a process.
2754 * However, if the cgroup becomes removable at a later time, it might be removed when
2755 * the containing slice is stopped. So even if we failed now, this unit shouldn't assume
2756 * that the cgroup is still realized the next time it is started. Do not return early
2757 * on error, continue cleanup. */
2758 log_unit_full_errno(u
, r
== -EBUSY
? LOG_DEBUG
: LOG_WARNING
, r
, "Failed to destroy cgroup %s, ignoring: %m", empty_to_root(u
->cgroup_path
));
2763 if (!unit_maybe_release_cgroup(u
)) /* Returns true if the cgroup was released */
2766 u
->cgroup_realized
= false;
2767 u
->cgroup_realized_mask
= 0;
2768 u
->cgroup_enabled_mask
= 0;
2770 u
->bpf_device_control_installed
= bpf_program_free(u
->bpf_device_control_installed
);
2773 int unit_search_main_pid(Unit
*u
, pid_t
*ret
) {
2774 _cleanup_fclose_
FILE *f
= NULL
;
2775 pid_t pid
= 0, npid
;
2781 if (!u
->cgroup_path
)
2784 r
= cg_enumerate_processes(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, &f
);
2788 while (cg_read_pid(f
, &npid
) > 0) {
2793 if (pid_is_my_child(npid
) == 0)
2797 /* Dang, there's more than one daemonized PID
2798 in this group, so we don't know what process
2799 is the main process. */
2810 static int unit_watch_pids_in_path(Unit
*u
, const char *path
) {
2811 _cleanup_closedir_
DIR *d
= NULL
;
2812 _cleanup_fclose_
FILE *f
= NULL
;
2818 r
= cg_enumerate_processes(SYSTEMD_CGROUP_CONTROLLER
, path
, &f
);
2824 while ((r
= cg_read_pid(f
, &pid
)) > 0) {
2825 r
= unit_watch_pid(u
, pid
, false);
2826 if (r
< 0 && ret
>= 0)
2830 if (r
< 0 && ret
>= 0)
2834 r
= cg_enumerate_subgroups(SYSTEMD_CGROUP_CONTROLLER
, path
, &d
);
2841 while ((r
= cg_read_subgroup(d
, &fn
)) > 0) {
2842 _cleanup_free_
char *p
= NULL
;
2844 p
= path_join(empty_to_root(path
), fn
);
2850 r
= unit_watch_pids_in_path(u
, p
);
2851 if (r
< 0 && ret
>= 0)
2855 if (r
< 0 && ret
>= 0)
2862 int unit_synthesize_cgroup_empty_event(Unit
*u
) {
2867 /* Enqueue a synthetic cgroup empty event if this unit doesn't watch any PIDs anymore. This is compatibility
2868 * support for non-unified systems where notifications aren't reliable, and hence need to take whatever we can
2869 * get as notification source as soon as we stopped having any useful PIDs to watch for. */
2871 if (!u
->cgroup_path
)
2874 r
= cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER
);
2877 if (r
> 0) /* On unified we have reliable notifications, and don't need this */
2880 if (!set_isempty(u
->pids
))
2883 unit_add_to_cgroup_empty_queue(u
);
2887 int unit_watch_all_pids(Unit
*u
) {
2892 /* Adds all PIDs from our cgroup to the set of PIDs we
2893 * watch. This is a fallback logic for cases where we do not
2894 * get reliable cgroup empty notifications: we try to use
2895 * SIGCHLD as replacement. */
2897 if (!u
->cgroup_path
)
2900 r
= cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER
);
2903 if (r
> 0) /* On unified we can use proper notifications */
2906 return unit_watch_pids_in_path(u
, u
->cgroup_path
);
2909 static int on_cgroup_empty_event(sd_event_source
*s
, void *userdata
) {
2910 Manager
*m
= userdata
;
2917 u
= m
->cgroup_empty_queue
;
2921 assert(u
->in_cgroup_empty_queue
);
2922 u
->in_cgroup_empty_queue
= false;
2923 LIST_REMOVE(cgroup_empty_queue
, m
->cgroup_empty_queue
, u
);
2925 if (m
->cgroup_empty_queue
) {
2926 /* More stuff queued, let's make sure we remain enabled */
2927 r
= sd_event_source_set_enabled(s
, SD_EVENT_ONESHOT
);
2929 log_debug_errno(r
, "Failed to reenable cgroup empty event source, ignoring: %m");
2932 unit_add_to_gc_queue(u
);
2934 if (UNIT_VTABLE(u
)->notify_cgroup_empty
)
2935 UNIT_VTABLE(u
)->notify_cgroup_empty(u
);
2940 void unit_add_to_cgroup_empty_queue(Unit
*u
) {
2945 /* Note that there are four different ways how cgroup empty events reach us:
2947 * 1. On the unified hierarchy we get an inotify event on the cgroup
2949 * 2. On the legacy hierarchy, when running in system mode, we get a datagram on the cgroup agent socket
2951 * 3. On the legacy hierarchy, when running in user mode, we get a D-Bus signal on the system bus
2953 * 4. On the legacy hierarchy, in service units we start watching all processes of the cgroup for SIGCHLD as
2954 * soon as we get one SIGCHLD, to deal with unreliable cgroup notifications.
2956 * Regardless which way we got the notification, we'll verify it here, and then add it to a separate
2957 * queue. This queue will be dispatched at a lower priority than the SIGCHLD handler, so that we always use
2958 * SIGCHLD if we can get it first, and only use the cgroup empty notifications if there's no SIGCHLD pending
2959 * (which might happen if the cgroup doesn't contain processes that are our own child, which is typically the
2960 * case for scope units). */
2962 if (u
->in_cgroup_empty_queue
)
2965 /* Let's verify that the cgroup is really empty */
2966 if (!u
->cgroup_path
)
2969 r
= cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
);
2971 log_unit_debug_errno(u
, r
, "Failed to determine whether cgroup %s is empty: %m", empty_to_root(u
->cgroup_path
));
2977 LIST_PREPEND(cgroup_empty_queue
, u
->manager
->cgroup_empty_queue
, u
);
2978 u
->in_cgroup_empty_queue
= true;
2980 /* Trigger the defer event */
2981 r
= sd_event_source_set_enabled(u
->manager
->cgroup_empty_event_source
, SD_EVENT_ONESHOT
);
2983 log_debug_errno(r
, "Failed to enable cgroup empty event source: %m");
2986 static void unit_remove_from_cgroup_empty_queue(Unit
*u
) {
2989 if (!u
->in_cgroup_empty_queue
)
2992 LIST_REMOVE(cgroup_empty_queue
, u
->manager
->cgroup_empty_queue
, u
);
2993 u
->in_cgroup_empty_queue
= false;
2996 int unit_check_oomd_kill(Unit
*u
) {
2997 _cleanup_free_
char *value
= NULL
;
3002 if (!u
->cgroup_path
)
3005 r
= cg_all_unified();
3007 return log_unit_debug_errno(u
, r
, "Couldn't determine whether we are in all unified mode: %m");
3011 r
= cg_get_xattr_malloc(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, "user.oomd_kill", &value
);
3012 if (r
< 0 && r
!= -ENODATA
)
3015 if (!isempty(value
)) {
3016 r
= safe_atou64(value
, &n
);
3021 increased
= n
> u
->managed_oom_kill_last
;
3022 u
->managed_oom_kill_last
= n
;
3028 log_unit_struct(u
, LOG_NOTICE
,
3029 "MESSAGE_ID=" SD_MESSAGE_UNIT_OOMD_KILL_STR
,
3030 LOG_UNIT_INVOCATION_ID(u
),
3031 LOG_UNIT_MESSAGE(u
, "systemd-oomd killed %"PRIu64
" process(es) in this unit.", n
));
3036 int unit_check_oom(Unit
*u
) {
3037 _cleanup_free_
char *oom_kill
= NULL
;
3042 if (!u
->cgroup_path
)
3045 r
= cg_get_keyed_attribute("memory", u
->cgroup_path
, "memory.events", STRV_MAKE("oom_kill"), &oom_kill
);
3046 if (IN_SET(r
, -ENOENT
, -ENXIO
)) /* Handle gracefully if cgroup or oom_kill attribute don't exist */
3049 return log_unit_debug_errno(u
, r
, "Failed to read oom_kill field of memory.events cgroup attribute: %m");
3051 r
= safe_atou64(oom_kill
, &c
);
3053 return log_unit_debug_errno(u
, r
, "Failed to parse oom_kill field: %m");
3056 increased
= c
> u
->oom_kill_last
;
3057 u
->oom_kill_last
= c
;
3062 log_unit_struct(u
, LOG_NOTICE
,
3063 "MESSAGE_ID=" SD_MESSAGE_UNIT_OUT_OF_MEMORY_STR
,
3064 LOG_UNIT_INVOCATION_ID(u
),
3065 LOG_UNIT_MESSAGE(u
, "A process of this unit has been killed by the OOM killer."));
3067 if (UNIT_VTABLE(u
)->notify_cgroup_oom
)
3068 UNIT_VTABLE(u
)->notify_cgroup_oom(u
);
3073 static int on_cgroup_oom_event(sd_event_source
*s
, void *userdata
) {
3074 Manager
*m
= userdata
;
3081 u
= m
->cgroup_oom_queue
;
3085 assert(u
->in_cgroup_oom_queue
);
3086 u
->in_cgroup_oom_queue
= false;
3087 LIST_REMOVE(cgroup_oom_queue
, m
->cgroup_oom_queue
, u
);
3089 if (m
->cgroup_oom_queue
) {
3090 /* More stuff queued, let's make sure we remain enabled */
3091 r
= sd_event_source_set_enabled(s
, SD_EVENT_ONESHOT
);
3093 log_debug_errno(r
, "Failed to reenable cgroup oom event source, ignoring: %m");
3096 (void) unit_check_oom(u
);
3100 static void unit_add_to_cgroup_oom_queue(Unit
*u
) {
3105 if (u
->in_cgroup_oom_queue
)
3107 if (!u
->cgroup_path
)
3110 LIST_PREPEND(cgroup_oom_queue
, u
->manager
->cgroup_oom_queue
, u
);
3111 u
->in_cgroup_oom_queue
= true;
3113 /* Trigger the defer event */
3114 if (!u
->manager
->cgroup_oom_event_source
) {
3115 _cleanup_(sd_event_source_unrefp
) sd_event_source
*s
= NULL
;
3117 r
= sd_event_add_defer(u
->manager
->event
, &s
, on_cgroup_oom_event
, u
->manager
);
3119 log_error_errno(r
, "Failed to create cgroup oom event source: %m");
3123 r
= sd_event_source_set_priority(s
, SD_EVENT_PRIORITY_NORMAL
-8);
3125 log_error_errno(r
, "Failed to set priority of cgroup oom event source: %m");
3129 (void) sd_event_source_set_description(s
, "cgroup-oom");
3130 u
->manager
->cgroup_oom_event_source
= TAKE_PTR(s
);
3133 r
= sd_event_source_set_enabled(u
->manager
->cgroup_oom_event_source
, SD_EVENT_ONESHOT
);
3135 log_error_errno(r
, "Failed to enable cgroup oom event source: %m");
3138 static int unit_check_cgroup_events(Unit
*u
) {
3139 char *values
[2] = {};
3144 if (!u
->cgroup_path
)
3147 r
= cg_get_keyed_attribute_graceful(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, "cgroup.events",
3148 STRV_MAKE("populated", "frozen"), values
);
3152 /* The cgroup.events notifications can be merged together so act as we saw the given state for the
3153 * first time. The functions we call to handle given state are idempotent, which makes them
3154 * effectively remember the previous state. */
3156 if (streq(values
[0], "1"))
3157 unit_remove_from_cgroup_empty_queue(u
);
3159 unit_add_to_cgroup_empty_queue(u
);
3162 /* Disregard freezer state changes due to operations not initiated by us */
3163 if (values
[1] && IN_SET(u
->freezer_state
, FREEZER_FREEZING
, FREEZER_THAWING
)) {
3164 if (streq(values
[1], "0"))
3176 static int on_cgroup_inotify_event(sd_event_source
*s
, int fd
, uint32_t revents
, void *userdata
) {
3177 Manager
*m
= userdata
;
3184 union inotify_event_buffer buffer
;
3185 struct inotify_event
*e
;
3188 l
= read(fd
, &buffer
, sizeof(buffer
));
3190 if (IN_SET(errno
, EINTR
, EAGAIN
))
3193 return log_error_errno(errno
, "Failed to read control group inotify events: %m");
3196 FOREACH_INOTIFY_EVENT(e
, buffer
, l
) {
3200 /* Queue overflow has no watch descriptor */
3203 if (e
->mask
& IN_IGNORED
)
3204 /* The watch was just removed */
3207 /* Note that inotify might deliver events for a watch even after it was removed,
3208 * because it was queued before the removal. Let's ignore this here safely. */
3210 u
= hashmap_get(m
->cgroup_control_inotify_wd_unit
, INT_TO_PTR(e
->wd
));
3212 unit_check_cgroup_events(u
);
3214 u
= hashmap_get(m
->cgroup_memory_inotify_wd_unit
, INT_TO_PTR(e
->wd
));
3216 unit_add_to_cgroup_oom_queue(u
);
3221 static int cg_bpf_mask_supported(CGroupMask
*ret
) {
3222 CGroupMask mask
= 0;
3225 /* BPF-based firewall */
3226 r
= bpf_firewall_supported();
3228 mask
|= CGROUP_MASK_BPF_FIREWALL
;
3230 /* BPF-based device access control */
3231 r
= bpf_devices_supported();
3233 mask
|= CGROUP_MASK_BPF_DEVICES
;
3235 /* BPF pinned prog */
3236 r
= bpf_foreign_supported();
3238 mask
|= CGROUP_MASK_BPF_FOREIGN
;
3240 /* BPF-based bind{4|6} hooks */
3241 r
= bpf_socket_bind_supported();
3243 mask
|= CGROUP_MASK_BPF_SOCKET_BIND
;
3245 /* BPF-based cgroup_skb/{egress|ingress} hooks */
3246 r
= restrict_network_interfaces_supported();
3248 mask
|= CGROUP_MASK_BPF_RESTRICT_NETWORK_INTERFACES
;
3254 int manager_setup_cgroup(Manager
*m
) {
3255 _cleanup_free_
char *path
= NULL
;
3256 const char *scope_path
;
3263 /* 1. Determine hierarchy */
3264 m
->cgroup_root
= mfree(m
->cgroup_root
);
3265 r
= cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER
, 0, &m
->cgroup_root
);
3267 return log_error_errno(r
, "Cannot determine cgroup we are running in: %m");
3269 /* Chop off the init scope, if we are already located in it */
3270 e
= endswith(m
->cgroup_root
, "/" SPECIAL_INIT_SCOPE
);
3272 /* LEGACY: Also chop off the system slice if we are in
3273 * it. This is to support live upgrades from older systemd
3274 * versions where PID 1 was moved there. Also see
3275 * cg_get_root_path(). */
3276 if (!e
&& MANAGER_IS_SYSTEM(m
)) {
3277 e
= endswith(m
->cgroup_root
, "/" SPECIAL_SYSTEM_SLICE
);
3279 e
= endswith(m
->cgroup_root
, "/system"); /* even more legacy */
3284 /* And make sure to store away the root value without trailing slash, even for the root dir, so that we can
3285 * easily prepend it everywhere. */
3286 delete_trailing_chars(m
->cgroup_root
, "/");
3289 r
= cg_get_path(SYSTEMD_CGROUP_CONTROLLER
, m
->cgroup_root
, NULL
, &path
);
3291 return log_error_errno(r
, "Cannot find cgroup mount point: %m");
3295 return log_error_errno(r
, "Couldn't determine if we are running in the unified hierarchy: %m");
3297 all_unified
= cg_all_unified();
3298 if (all_unified
< 0)
3299 return log_error_errno(all_unified
, "Couldn't determine whether we are in all unified mode: %m");
3300 if (all_unified
> 0)
3301 log_debug("Unified cgroup hierarchy is located at %s.", path
);
3303 r
= cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER
);
3305 return log_error_errno(r
, "Failed to determine whether systemd's own controller is in unified mode: %m");
3307 log_debug("Unified cgroup hierarchy is located at %s. Controllers are on legacy hierarchies.", path
);
3309 log_debug("Using cgroup controller " SYSTEMD_CGROUP_CONTROLLER_LEGACY
". File system hierarchy is at %s.", path
);
3312 /* 3. Allocate cgroup empty defer event source */
3313 m
->cgroup_empty_event_source
= sd_event_source_disable_unref(m
->cgroup_empty_event_source
);
3314 r
= sd_event_add_defer(m
->event
, &m
->cgroup_empty_event_source
, on_cgroup_empty_event
, m
);
3316 return log_error_errno(r
, "Failed to create cgroup empty event source: %m");
3318 /* Schedule cgroup empty checks early, but after having processed service notification messages or
3319 * SIGCHLD signals, so that a cgroup running empty is always just the last safety net of
3320 * notification, and we collected the metadata the notification and SIGCHLD stuff offers first. */
3321 r
= sd_event_source_set_priority(m
->cgroup_empty_event_source
, SD_EVENT_PRIORITY_NORMAL
-5);
3323 return log_error_errno(r
, "Failed to set priority of cgroup empty event source: %m");
3325 r
= sd_event_source_set_enabled(m
->cgroup_empty_event_source
, SD_EVENT_OFF
);
3327 return log_error_errno(r
, "Failed to disable cgroup empty event source: %m");
3329 (void) sd_event_source_set_description(m
->cgroup_empty_event_source
, "cgroup-empty");
3331 /* 4. Install notifier inotify object, or agent */
3332 if (cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER
) > 0) {
3334 /* In the unified hierarchy we can get cgroup empty notifications via inotify. */
3336 m
->cgroup_inotify_event_source
= sd_event_source_disable_unref(m
->cgroup_inotify_event_source
);
3337 safe_close(m
->cgroup_inotify_fd
);
3339 m
->cgroup_inotify_fd
= inotify_init1(IN_NONBLOCK
|IN_CLOEXEC
);
3340 if (m
->cgroup_inotify_fd
< 0)
3341 return log_error_errno(errno
, "Failed to create control group inotify object: %m");
3343 r
= sd_event_add_io(m
->event
, &m
->cgroup_inotify_event_source
, m
->cgroup_inotify_fd
, EPOLLIN
, on_cgroup_inotify_event
, m
);
3345 return log_error_errno(r
, "Failed to watch control group inotify object: %m");
3347 /* Process cgroup empty notifications early. Note that when this event is dispatched it'll
3348 * just add the unit to a cgroup empty queue, hence let's run earlier than that. Also see
3349 * handling of cgroup agent notifications, for the classic cgroup hierarchy support. */
3350 r
= sd_event_source_set_priority(m
->cgroup_inotify_event_source
, SD_EVENT_PRIORITY_NORMAL
-9);
3352 return log_error_errno(r
, "Failed to set priority of inotify event source: %m");
3354 (void) sd_event_source_set_description(m
->cgroup_inotify_event_source
, "cgroup-inotify");
3356 } else if (MANAGER_IS_SYSTEM(m
) && manager_owns_host_root_cgroup(m
) && !MANAGER_IS_TEST_RUN(m
)) {
3358 /* On the legacy hierarchy we only get notifications via cgroup agents. (Which isn't really reliable,
3359 * since it does not generate events when control groups with children run empty. */
3361 r
= cg_install_release_agent(SYSTEMD_CGROUP_CONTROLLER
, SYSTEMD_CGROUPS_AGENT_PATH
);
3363 log_warning_errno(r
, "Failed to install release agent, ignoring: %m");
3365 log_debug("Installed release agent.");
3367 log_debug("Release agent already installed.");
3370 /* 5. Make sure we are in the special "init.scope" unit in the root slice. */
3371 scope_path
= strjoina(m
->cgroup_root
, "/" SPECIAL_INIT_SCOPE
);
3372 r
= cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER
, scope_path
, 0);
3374 /* Also, move all other userspace processes remaining in the root cgroup into that scope. */
3375 r
= cg_migrate(SYSTEMD_CGROUP_CONTROLLER
, m
->cgroup_root
, SYSTEMD_CGROUP_CONTROLLER
, scope_path
, 0);
3377 log_warning_errno(r
, "Couldn't move remaining userspace processes, ignoring: %m");
3379 /* 6. And pin it, so that it cannot be unmounted */
3380 safe_close(m
->pin_cgroupfs_fd
);
3381 m
->pin_cgroupfs_fd
= open(path
, O_RDONLY
|O_CLOEXEC
|O_DIRECTORY
|O_NOCTTY
|O_NONBLOCK
);
3382 if (m
->pin_cgroupfs_fd
< 0)
3383 return log_error_errno(errno
, "Failed to open pin file: %m");
3385 } else if (!MANAGER_IS_TEST_RUN(m
))
3386 return log_error_errno(r
, "Failed to create %s control group: %m", scope_path
);
3388 /* 7. Always enable hierarchical support if it exists... */
3389 if (!all_unified
&& !MANAGER_IS_TEST_RUN(m
))
3390 (void) cg_set_attribute("memory", "/", "memory.use_hierarchy", "1");
3392 /* 8. Figure out which controllers are supported */
3393 r
= cg_mask_supported_subtree(m
->cgroup_root
, &m
->cgroup_supported
);
3395 return log_error_errno(r
, "Failed to determine supported controllers: %m");
3397 /* 9. Figure out which bpf-based pseudo-controllers are supported */
3398 r
= cg_bpf_mask_supported(&mask
);
3400 return log_error_errno(r
, "Failed to determine supported bpf-based pseudo-controllers: %m");
3401 m
->cgroup_supported
|= mask
;
3403 /* 10. Log which controllers are supported */
3404 for (CGroupController c
= 0; c
< _CGROUP_CONTROLLER_MAX
; c
++)
3405 log_debug("Controller '%s' supported: %s", cgroup_controller_to_string(c
),
3406 yes_no(m
->cgroup_supported
& CGROUP_CONTROLLER_TO_MASK(c
)));
3411 void manager_shutdown_cgroup(Manager
*m
, bool delete) {
3414 /* We can't really delete the group, since we are in it. But
3416 if (delete && m
->cgroup_root
&& !FLAGS_SET(m
->test_run_flags
, MANAGER_TEST_RUN_MINIMAL
))
3417 (void) cg_trim(SYSTEMD_CGROUP_CONTROLLER
, m
->cgroup_root
, false);
3419 m
->cgroup_empty_event_source
= sd_event_source_disable_unref(m
->cgroup_empty_event_source
);
3421 m
->cgroup_control_inotify_wd_unit
= hashmap_free(m
->cgroup_control_inotify_wd_unit
);
3422 m
->cgroup_memory_inotify_wd_unit
= hashmap_free(m
->cgroup_memory_inotify_wd_unit
);
3424 m
->cgroup_inotify_event_source
= sd_event_source_disable_unref(m
->cgroup_inotify_event_source
);
3425 m
->cgroup_inotify_fd
= safe_close(m
->cgroup_inotify_fd
);
3427 m
->pin_cgroupfs_fd
= safe_close(m
->pin_cgroupfs_fd
);
3429 m
->cgroup_root
= mfree(m
->cgroup_root
);
3432 Unit
* manager_get_unit_by_cgroup(Manager
*m
, const char *cgroup
) {
3439 u
= hashmap_get(m
->cgroup_unit
, cgroup
);
3443 p
= strdupa_safe(cgroup
);
3447 e
= strrchr(p
, '/');
3449 return hashmap_get(m
->cgroup_unit
, SPECIAL_ROOT_SLICE
);
3453 u
= hashmap_get(m
->cgroup_unit
, p
);
3459 Unit
*manager_get_unit_by_pid_cgroup(Manager
*m
, pid_t pid
) {
3460 _cleanup_free_
char *cgroup
= NULL
;
3464 if (!pid_is_valid(pid
))
3467 if (cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER
, pid
, &cgroup
) < 0)
3470 return manager_get_unit_by_cgroup(m
, cgroup
);
3473 Unit
*manager_get_unit_by_pid(Manager
*m
, pid_t pid
) {
3478 /* Note that a process might be owned by multiple units, we return only one here, which is good enough for most
3479 * cases, though not strictly correct. We prefer the one reported by cgroup membership, as that's the most
3480 * relevant one as children of the process will be assigned to that one, too, before all else. */
3482 if (!pid_is_valid(pid
))
3485 if (pid
== getpid_cached())
3486 return hashmap_get(m
->units
, SPECIAL_INIT_SCOPE
);
3488 u
= manager_get_unit_by_pid_cgroup(m
, pid
);
3492 u
= hashmap_get(m
->watch_pids
, PID_TO_PTR(pid
));
3496 array
= hashmap_get(m
->watch_pids
, PID_TO_PTR(-pid
));
3503 int manager_notify_cgroup_empty(Manager
*m
, const char *cgroup
) {
3509 /* Called on the legacy hierarchy whenever we get an explicit cgroup notification from the cgroup agent process
3510 * or from the --system instance */
3512 log_debug("Got cgroup empty notification for: %s", cgroup
);
3514 u
= manager_get_unit_by_cgroup(m
, cgroup
);
3518 unit_add_to_cgroup_empty_queue(u
);
3522 int unit_get_memory_available(Unit
*u
, uint64_t *ret
) {
3523 uint64_t unit_current
, available
= UINT64_MAX
;
3524 CGroupContext
*unit_context
;
3525 const char *memory_file
;
3531 /* If data from cgroups can be accessed, try to find out how much more memory a unit can
3532 * claim before hitting the configured cgroup limits (if any). Consider both MemoryHigh
3533 * and MemoryMax, and also any slice the unit might be nested below. */
3535 if (!UNIT_CGROUP_BOOL(u
, memory_accounting
))
3538 if (!u
->cgroup_path
)
3541 /* The root cgroup doesn't expose this information */
3542 if (unit_has_host_root_cgroup(u
))
3545 if ((u
->cgroup_realized_mask
& CGROUP_MASK_MEMORY
) == 0)
3548 r
= cg_all_unified();
3551 memory_file
= r
> 0 ? "memory.current" : "memory.usage_in_bytes";
3553 r
= cg_get_attribute_as_uint64("memory", u
->cgroup_path
, memory_file
, &unit_current
);
3557 assert_se(unit_context
= unit_get_cgroup_context(u
));
3559 if (unit_context
->memory_max
!= UINT64_MAX
|| unit_context
->memory_high
!= UINT64_MAX
)
3560 available
= LESS_BY(MIN(unit_context
->memory_max
, unit_context
->memory_high
), unit_current
);
3562 for (Unit
*slice
= UNIT_GET_SLICE(u
); slice
; slice
= UNIT_GET_SLICE(slice
)) {
3563 uint64_t slice_current
, slice_available
= UINT64_MAX
;
3564 CGroupContext
*slice_context
;
3566 /* No point in continuing if we can't go any lower */
3570 if (!slice
->cgroup_path
)
3573 slice_context
= unit_get_cgroup_context(slice
);
3577 if (slice_context
->memory_max
== UINT64_MAX
&& slice_context
->memory_high
== UINT64_MAX
)
3580 r
= cg_get_attribute_as_uint64("memory", slice
->cgroup_path
, memory_file
, &slice_current
);
3584 slice_available
= LESS_BY(MIN(slice_context
->memory_max
, slice_context
->memory_high
), slice_current
);
3585 available
= MIN(slice_available
, available
);
3593 int unit_get_memory_current(Unit
*u
, uint64_t *ret
) {
3599 if (!UNIT_CGROUP_BOOL(u
, memory_accounting
))
3602 if (!u
->cgroup_path
)
3605 /* The root cgroup doesn't expose this information, let's get it from /proc instead */
3606 if (unit_has_host_root_cgroup(u
))
3607 return procfs_memory_get_used(ret
);
3609 if ((u
->cgroup_realized_mask
& CGROUP_MASK_MEMORY
) == 0)
3612 r
= cg_all_unified();
3616 return cg_get_attribute_as_uint64("memory", u
->cgroup_path
, r
> 0 ? "memory.current" : "memory.usage_in_bytes", ret
);
3619 int unit_get_tasks_current(Unit
*u
, uint64_t *ret
) {
3623 if (!UNIT_CGROUP_BOOL(u
, tasks_accounting
))
3626 if (!u
->cgroup_path
)
3629 /* The root cgroup doesn't expose this information, let's get it from /proc instead */
3630 if (unit_has_host_root_cgroup(u
))
3631 return procfs_tasks_get_current(ret
);
3633 if ((u
->cgroup_realized_mask
& CGROUP_MASK_PIDS
) == 0)
3636 return cg_get_attribute_as_uint64("pids", u
->cgroup_path
, "pids.current", ret
);
3639 static int unit_get_cpu_usage_raw(Unit
*u
, nsec_t
*ret
) {
3646 if (!u
->cgroup_path
)
3649 /* The root cgroup doesn't expose this information, let's get it from /proc instead */
3650 if (unit_has_host_root_cgroup(u
))
3651 return procfs_cpu_get_usage(ret
);
3653 /* Requisite controllers for CPU accounting are not enabled */
3654 if ((get_cpu_accounting_mask() & ~u
->cgroup_realized_mask
) != 0)
3657 r
= cg_all_unified();
3661 _cleanup_free_
char *val
= NULL
;
3664 r
= cg_get_keyed_attribute("cpu", u
->cgroup_path
, "cpu.stat", STRV_MAKE("usage_usec"), &val
);
3665 if (IN_SET(r
, -ENOENT
, -ENXIO
))
3670 r
= safe_atou64(val
, &us
);
3674 ns
= us
* NSEC_PER_USEC
;
3676 return cg_get_attribute_as_uint64("cpuacct", u
->cgroup_path
, "cpuacct.usage", ret
);
3682 int unit_get_cpu_usage(Unit
*u
, nsec_t
*ret
) {
3688 /* Retrieve the current CPU usage counter. This will subtract the CPU counter taken when the unit was
3689 * started. If the cgroup has been removed already, returns the last cached value. To cache the value, simply
3690 * call this function with a NULL return value. */
3692 if (!UNIT_CGROUP_BOOL(u
, cpu_accounting
))
3695 r
= unit_get_cpu_usage_raw(u
, &ns
);
3696 if (r
== -ENODATA
&& u
->cpu_usage_last
!= NSEC_INFINITY
) {
3697 /* If we can't get the CPU usage anymore (because the cgroup was already removed, for example), use our
3701 *ret
= u
->cpu_usage_last
;
3707 if (ns
> u
->cpu_usage_base
)
3708 ns
-= u
->cpu_usage_base
;
3712 u
->cpu_usage_last
= ns
;
3719 int unit_get_ip_accounting(
3721 CGroupIPAccountingMetric metric
,
3728 assert(metric
>= 0);
3729 assert(metric
< _CGROUP_IP_ACCOUNTING_METRIC_MAX
);
3732 if (!UNIT_CGROUP_BOOL(u
, ip_accounting
))
3735 fd
= IN_SET(metric
, CGROUP_IP_INGRESS_BYTES
, CGROUP_IP_INGRESS_PACKETS
) ?
3736 u
->ip_accounting_ingress_map_fd
:
3737 u
->ip_accounting_egress_map_fd
;
3741 if (IN_SET(metric
, CGROUP_IP_INGRESS_BYTES
, CGROUP_IP_EGRESS_BYTES
))
3742 r
= bpf_firewall_read_accounting(fd
, &value
, NULL
);
3744 r
= bpf_firewall_read_accounting(fd
, NULL
, &value
);
3748 /* Add in additional metrics from a previous runtime. Note that when reexecing/reloading the daemon we compile
3749 * all BPF programs and maps anew, but serialize the old counters. When deserializing we store them in the
3750 * ip_accounting_extra[] field, and add them in here transparently. */
3752 *ret
= value
+ u
->ip_accounting_extra
[metric
];
3757 static int unit_get_io_accounting_raw(Unit
*u
, uint64_t ret
[static _CGROUP_IO_ACCOUNTING_METRIC_MAX
]) {
3758 static const char *const field_names
[_CGROUP_IO_ACCOUNTING_METRIC_MAX
] = {
3759 [CGROUP_IO_READ_BYTES
] = "rbytes=",
3760 [CGROUP_IO_WRITE_BYTES
] = "wbytes=",
3761 [CGROUP_IO_READ_OPERATIONS
] = "rios=",
3762 [CGROUP_IO_WRITE_OPERATIONS
] = "wios=",
3764 uint64_t acc
[_CGROUP_IO_ACCOUNTING_METRIC_MAX
] = {};
3765 _cleanup_free_
char *path
= NULL
;
3766 _cleanup_fclose_
FILE *f
= NULL
;
3771 if (!u
->cgroup_path
)
3774 if (unit_has_host_root_cgroup(u
))
3775 return -ENODATA
; /* TODO: return useful data for the top-level cgroup */
3777 r
= cg_all_unified();
3780 if (r
== 0) /* TODO: support cgroupv1 */
3783 if (!FLAGS_SET(u
->cgroup_realized_mask
, CGROUP_MASK_IO
))
3786 r
= cg_get_path("io", u
->cgroup_path
, "io.stat", &path
);
3790 f
= fopen(path
, "re");
3795 _cleanup_free_
char *line
= NULL
;
3798 r
= read_line(f
, LONG_LINE_MAX
, &line
);
3805 p
+= strcspn(p
, WHITESPACE
); /* Skip over device major/minor */
3806 p
+= strspn(p
, WHITESPACE
); /* Skip over following whitespace */
3809 _cleanup_free_
char *word
= NULL
;
3811 r
= extract_first_word(&p
, &word
, NULL
, EXTRACT_RETAIN_ESCAPE
);
3817 for (CGroupIOAccountingMetric i
= 0; i
< _CGROUP_IO_ACCOUNTING_METRIC_MAX
; i
++) {
3820 x
= startswith(word
, field_names
[i
]);
3824 r
= safe_atou64(x
, &w
);
3828 /* Sum up the stats of all devices */
3836 memcpy(ret
, acc
, sizeof(acc
));
3840 int unit_get_io_accounting(
3842 CGroupIOAccountingMetric metric
,
3846 uint64_t raw
[_CGROUP_IO_ACCOUNTING_METRIC_MAX
];
3849 /* Retrieve an IO account parameter. This will subtract the counter when the unit was started. */
3851 if (!UNIT_CGROUP_BOOL(u
, io_accounting
))
3854 if (allow_cache
&& u
->io_accounting_last
[metric
] != UINT64_MAX
)
3857 r
= unit_get_io_accounting_raw(u
, raw
);
3858 if (r
== -ENODATA
&& u
->io_accounting_last
[metric
] != UINT64_MAX
)
3863 for (CGroupIOAccountingMetric i
= 0; i
< _CGROUP_IO_ACCOUNTING_METRIC_MAX
; i
++) {
3864 /* Saturated subtraction */
3865 if (raw
[i
] > u
->io_accounting_base
[i
])
3866 u
->io_accounting_last
[i
] = raw
[i
] - u
->io_accounting_base
[i
];
3868 u
->io_accounting_last
[i
] = 0;
3873 *ret
= u
->io_accounting_last
[metric
];
3878 int unit_reset_cpu_accounting(Unit
*u
) {
3883 u
->cpu_usage_last
= NSEC_INFINITY
;
3885 r
= unit_get_cpu_usage_raw(u
, &u
->cpu_usage_base
);
3887 u
->cpu_usage_base
= 0;
3894 int unit_reset_ip_accounting(Unit
*u
) {
3899 if (u
->ip_accounting_ingress_map_fd
>= 0)
3900 r
= bpf_firewall_reset_accounting(u
->ip_accounting_ingress_map_fd
);
3902 if (u
->ip_accounting_egress_map_fd
>= 0)
3903 q
= bpf_firewall_reset_accounting(u
->ip_accounting_egress_map_fd
);
3905 zero(u
->ip_accounting_extra
);
3907 return r
< 0 ? r
: q
;
3910 int unit_reset_io_accounting(Unit
*u
) {
3915 for (CGroupIOAccountingMetric i
= 0; i
< _CGROUP_IO_ACCOUNTING_METRIC_MAX
; i
++)
3916 u
->io_accounting_last
[i
] = UINT64_MAX
;
3918 r
= unit_get_io_accounting_raw(u
, u
->io_accounting_base
);
3920 zero(u
->io_accounting_base
);
3927 int unit_reset_accounting(Unit
*u
) {
3932 r
= unit_reset_cpu_accounting(u
);
3933 q
= unit_reset_io_accounting(u
);
3934 v
= unit_reset_ip_accounting(u
);
3936 return r
< 0 ? r
: q
< 0 ? q
: v
;
3939 void unit_invalidate_cgroup(Unit
*u
, CGroupMask m
) {
3942 if (!UNIT_HAS_CGROUP_CONTEXT(u
))
3948 /* always invalidate compat pairs together */
3949 if (m
& (CGROUP_MASK_IO
| CGROUP_MASK_BLKIO
))
3950 m
|= CGROUP_MASK_IO
| CGROUP_MASK_BLKIO
;
3952 if (m
& (CGROUP_MASK_CPU
| CGROUP_MASK_CPUACCT
))
3953 m
|= CGROUP_MASK_CPU
| CGROUP_MASK_CPUACCT
;
3955 if (FLAGS_SET(u
->cgroup_invalidated_mask
, m
)) /* NOP? */
3958 u
->cgroup_invalidated_mask
|= m
;
3959 unit_add_to_cgroup_realize_queue(u
);
3962 void unit_invalidate_cgroup_bpf(Unit
*u
) {
3965 if (!UNIT_HAS_CGROUP_CONTEXT(u
))
3968 if (u
->cgroup_invalidated_mask
& CGROUP_MASK_BPF_FIREWALL
) /* NOP? */
3971 u
->cgroup_invalidated_mask
|= CGROUP_MASK_BPF_FIREWALL
;
3972 unit_add_to_cgroup_realize_queue(u
);
3974 /* If we are a slice unit, we also need to put compile a new BPF program for all our children, as the IP access
3975 * list of our children includes our own. */
3976 if (u
->type
== UNIT_SLICE
) {
3979 UNIT_FOREACH_DEPENDENCY(member
, u
, UNIT_ATOM_SLICE_OF
)
3980 unit_invalidate_cgroup_bpf(member
);
3984 void unit_cgroup_catchup(Unit
*u
) {
3987 if (!UNIT_HAS_CGROUP_CONTEXT(u
))
3990 /* We dropped the inotify watch during reexec/reload, so we need to
3991 * check these as they may have changed.
3992 * Note that (currently) the kernel doesn't actually update cgroup
3993 * file modification times, so we can't just serialize and then check
3994 * the mtime for file(s) we are interested in. */
3995 (void) unit_check_cgroup_events(u
);
3996 unit_add_to_cgroup_oom_queue(u
);
3999 bool unit_cgroup_delegate(Unit
*u
) {
4004 if (!UNIT_VTABLE(u
)->can_delegate
)
4007 c
= unit_get_cgroup_context(u
);
4014 void manager_invalidate_startup_units(Manager
*m
) {
4019 SET_FOREACH(u
, m
->startup_units
)
4020 unit_invalidate_cgroup(u
, CGROUP_MASK_CPU
|CGROUP_MASK_IO
|CGROUP_MASK_BLKIO
|CGROUP_MASK_CPUSET
);
4023 static int unit_get_nice(Unit
*u
) {
4026 ec
= unit_get_exec_context(u
);
4027 return ec
? ec
->nice
: 0;
4030 static uint64_t unit_get_cpu_weight(Unit
*u
) {
4031 ManagerState state
= manager_state(u
->manager
);
4034 cc
= unit_get_cgroup_context(u
);
4035 return cc
? cgroup_context_cpu_weight(cc
, state
) : CGROUP_WEIGHT_DEFAULT
;
4038 int compare_job_priority(const void *a
, const void *b
) {
4039 const Job
*x
= a
, *y
= b
;
4041 uint64_t weight_x
, weight_y
;
4044 if ((ret
= CMP(x
->unit
->type
, y
->unit
->type
)) != 0)
4047 weight_x
= unit_get_cpu_weight(x
->unit
);
4048 weight_y
= unit_get_cpu_weight(y
->unit
);
4050 if ((ret
= CMP(weight_x
, weight_y
)) != 0)
4053 nice_x
= unit_get_nice(x
->unit
);
4054 nice_y
= unit_get_nice(y
->unit
);
4056 if ((ret
= CMP(nice_x
, nice_y
)) != 0)
4059 return strcmp(x
->unit
->id
, y
->unit
->id
);
4062 int unit_cgroup_freezer_action(Unit
*u
, FreezerAction action
) {
4063 _cleanup_free_
char *path
= NULL
;
4064 FreezerState target
, kernel
= _FREEZER_STATE_INVALID
;
4068 assert(IN_SET(action
, FREEZER_FREEZE
, FREEZER_THAW
));
4070 if (!cg_freezer_supported())
4073 if (!u
->cgroup_realized
)
4076 target
= action
== FREEZER_FREEZE
? FREEZER_FROZEN
: FREEZER_RUNNING
;
4078 r
= unit_freezer_state_kernel(u
, &kernel
);
4080 log_unit_debug_errno(u
, r
, "Failed to obtain cgroup freezer state: %m");
4082 if (target
== kernel
) {
4083 u
->freezer_state
= target
;
4087 r
= cg_get_path(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, "cgroup.freeze", &path
);
4091 log_unit_debug(u
, "%s unit.", action
== FREEZER_FREEZE
? "Freezing" : "Thawing");
4093 if (action
== FREEZER_FREEZE
)
4094 u
->freezer_state
= FREEZER_FREEZING
;
4096 u
->freezer_state
= FREEZER_THAWING
;
4098 r
= write_string_file(path
, one_zero(action
== FREEZER_FREEZE
), WRITE_STRING_FILE_DISABLE_BUFFER
);
4105 int unit_get_cpuset(Unit
*u
, CPUSet
*cpus
, const char *name
) {
4106 _cleanup_free_
char *v
= NULL
;
4112 if (!u
->cgroup_path
)
4115 if ((u
->cgroup_realized_mask
& CGROUP_MASK_CPUSET
) == 0)
4118 r
= cg_all_unified();
4124 r
= cg_get_attribute("cpuset", u
->cgroup_path
, name
, &v
);
4130 return parse_cpu_set_full(v
, cpus
, false, NULL
, NULL
, 0, NULL
);
4133 static const char* const cgroup_device_policy_table
[_CGROUP_DEVICE_POLICY_MAX
] = {
4134 [CGROUP_DEVICE_POLICY_AUTO
] = "auto",
4135 [CGROUP_DEVICE_POLICY_CLOSED
] = "closed",
4136 [CGROUP_DEVICE_POLICY_STRICT
] = "strict",
4139 DEFINE_STRING_TABLE_LOOKUP(cgroup_device_policy
, CGroupDevicePolicy
);
4141 static const char* const freezer_action_table
[_FREEZER_ACTION_MAX
] = {
4142 [FREEZER_FREEZE
] = "freeze",
4143 [FREEZER_THAW
] = "thaw",
4146 DEFINE_STRING_TABLE_LOOKUP(freezer_action
, FreezerAction
);