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1/* SPDX-License-Identifier: GPL-2.0 */2#ifndef _LINUX_CGROUP_H3#define _LINUX_CGROUP_H4/*5 * cgroup interface6 *7 * Copyright (C) 2003 BULL SA8 * Copyright (C) 2004-2006 Silicon Graphics, Inc.9 *10 */11 12#include <linux/sched.h>13#include <linux/nodemask.h>14#include <linux/list.h>15#include <linux/rculist.h>16#include <linux/cgroupstats.h>17#include <linux/fs.h>18#include <linux/seq_file.h>19#include <linux/kernfs.h>20#include <linux/jump_label.h>21#include <linux/types.h>22#include <linux/ns_common.h>23#include <linux/nsproxy.h>24#include <linux/user_namespace.h>25#include <linux/refcount.h>26#include <linux/kernel_stat.h>27 28#include <linux/cgroup-defs.h>29 30struct kernel_clone_args;31 32/*33 * All weight knobs on the default hierarchy should use the following min,34 * default and max values. The default value is the logarithmic center of35 * MIN and MAX and allows 100x to be expressed in both directions.36 */37#define CGROUP_WEIGHT_MIN 138#define CGROUP_WEIGHT_DFL 10039#define CGROUP_WEIGHT_MAX 1000040 41#ifdef CONFIG_CGROUPS42 43enum {44 CSS_TASK_ITER_PROCS = (1U << 0), /* walk only threadgroup leaders */45 CSS_TASK_ITER_THREADED = (1U << 1), /* walk all threaded css_sets in the domain */46 CSS_TASK_ITER_SKIPPED = (1U << 16), /* internal flags */47};48 49/* a css_task_iter should be treated as an opaque object */50struct css_task_iter {51 struct cgroup_subsys *ss;52 unsigned int flags;53 54 struct list_head *cset_pos;55 struct list_head *cset_head;56 57 struct list_head *tcset_pos;58 struct list_head *tcset_head;59 60 struct list_head *task_pos;61 62 struct list_head *cur_tasks_head;63 struct css_set *cur_cset;64 struct css_set *cur_dcset;65 struct task_struct *cur_task;66 struct list_head iters_node; /* css_set->task_iters */67};68 69extern struct file_system_type cgroup_fs_type;70extern struct cgroup_root cgrp_dfl_root;71extern struct css_set init_css_set;72extern spinlock_t css_set_lock;73 74#define SUBSYS(_x) extern struct cgroup_subsys _x ## _cgrp_subsys;75#include <linux/cgroup_subsys.h>76#undef SUBSYS77 78#define SUBSYS(_x) \79 extern struct static_key_true _x ## _cgrp_subsys_enabled_key; \80 extern struct static_key_true _x ## _cgrp_subsys_on_dfl_key;81#include <linux/cgroup_subsys.h>82#undef SUBSYS83 84/**85 * cgroup_subsys_enabled - fast test on whether a subsys is enabled86 * @ss: subsystem in question87 */88#define cgroup_subsys_enabled(ss) \89 static_branch_likely(&ss ## _enabled_key)90 91/**92 * cgroup_subsys_on_dfl - fast test on whether a subsys is on default hierarchy93 * @ss: subsystem in question94 */95#define cgroup_subsys_on_dfl(ss) \96 static_branch_likely(&ss ## _on_dfl_key)97 98bool css_has_online_children(struct cgroup_subsys_state *css);99struct cgroup_subsys_state *css_from_id(int id, struct cgroup_subsys *ss);100struct cgroup_subsys_state *cgroup_e_css(struct cgroup *cgroup,101 struct cgroup_subsys *ss);102struct cgroup_subsys_state *cgroup_get_e_css(struct cgroup *cgroup,103 struct cgroup_subsys *ss);104struct cgroup_subsys_state *css_tryget_online_from_dir(struct dentry *dentry,105 struct cgroup_subsys *ss);106 107struct cgroup *cgroup_get_from_path(const char *path);108struct cgroup *cgroup_get_from_fd(int fd);109struct cgroup *cgroup_v1v2_get_from_fd(int fd);110 111int cgroup_attach_task_all(struct task_struct *from, struct task_struct *);112int cgroup_transfer_tasks(struct cgroup *to, struct cgroup *from);113 114int cgroup_add_dfl_cftypes(struct cgroup_subsys *ss, struct cftype *cfts);115int cgroup_add_legacy_cftypes(struct cgroup_subsys *ss, struct cftype *cfts);116int cgroup_rm_cftypes(struct cftype *cfts);117void cgroup_file_notify(struct cgroup_file *cfile);118void cgroup_file_show(struct cgroup_file *cfile, bool show);119 120int cgroupstats_build(struct cgroupstats *stats, struct dentry *dentry);121int proc_cgroup_show(struct seq_file *m, struct pid_namespace *ns,122 struct pid *pid, struct task_struct *tsk);123 124void cgroup_fork(struct task_struct *p);125extern int cgroup_can_fork(struct task_struct *p,126 struct kernel_clone_args *kargs);127extern void cgroup_cancel_fork(struct task_struct *p,128 struct kernel_clone_args *kargs);129extern void cgroup_post_fork(struct task_struct *p,130 struct kernel_clone_args *kargs);131void cgroup_exit(struct task_struct *p);132void cgroup_release(struct task_struct *p);133void cgroup_free(struct task_struct *p);134 135int cgroup_init_early(void);136int cgroup_init(void);137 138int cgroup_parse_float(const char *input, unsigned dec_shift, s64 *v);139 140/*141 * Iteration helpers and macros.142 */143 144struct cgroup_subsys_state *css_next_child(struct cgroup_subsys_state *pos,145 struct cgroup_subsys_state *parent);146struct cgroup_subsys_state *css_next_descendant_pre(struct cgroup_subsys_state *pos,147 struct cgroup_subsys_state *css);148struct cgroup_subsys_state *css_rightmost_descendant(struct cgroup_subsys_state *pos);149struct cgroup_subsys_state *css_next_descendant_post(struct cgroup_subsys_state *pos,150 struct cgroup_subsys_state *css);151 152struct task_struct *cgroup_taskset_first(struct cgroup_taskset *tset,153 struct cgroup_subsys_state **dst_cssp);154struct task_struct *cgroup_taskset_next(struct cgroup_taskset *tset,155 struct cgroup_subsys_state **dst_cssp);156 157void css_task_iter_start(struct cgroup_subsys_state *css, unsigned int flags,158 struct css_task_iter *it);159struct task_struct *css_task_iter_next(struct css_task_iter *it);160void css_task_iter_end(struct css_task_iter *it);161 162/**163 * css_for_each_child - iterate through children of a css164 * @pos: the css * to use as the loop cursor165 * @parent: css whose children to walk166 *167 * Walk @parent's children. Must be called under rcu_read_lock().168 *169 * If a subsystem synchronizes ->css_online() and the start of iteration, a170 * css which finished ->css_online() is guaranteed to be visible in the171 * future iterations and will stay visible until the last reference is put.172 * A css which hasn't finished ->css_online() or already finished173 * ->css_offline() may show up during traversal. It's each subsystem's174 * responsibility to synchronize against on/offlining.175 *176 * It is allowed to temporarily drop RCU read lock during iteration. The177 * caller is responsible for ensuring that @pos remains accessible until178 * the start of the next iteration by, for example, bumping the css refcnt.179 */180#define css_for_each_child(pos, parent) \181 for ((pos) = css_next_child(NULL, (parent)); (pos); \182 (pos) = css_next_child((pos), (parent)))183 184/**185 * css_for_each_descendant_pre - pre-order walk of a css's descendants186 * @pos: the css * to use as the loop cursor187 * @root: css whose descendants to walk188 *189 * Walk @root's descendants. @root is included in the iteration and the190 * first node to be visited. Must be called under rcu_read_lock().191 *192 * If a subsystem synchronizes ->css_online() and the start of iteration, a193 * css which finished ->css_online() is guaranteed to be visible in the194 * future iterations and will stay visible until the last reference is put.195 * A css which hasn't finished ->css_online() or already finished196 * ->css_offline() may show up during traversal. It's each subsystem's197 * responsibility to synchronize against on/offlining.198 *199 * For example, the following guarantees that a descendant can't escape200 * state updates of its ancestors.201 *202 * my_online(@css)203 * {204 * Lock @css's parent and @css;205 * Inherit state from the parent;206 * Unlock both.207 * }208 *209 * my_update_state(@css)210 * {211 * css_for_each_descendant_pre(@pos, @css) {212 * Lock @pos;213 * if (@pos == @css)214 * Update @css's state;215 * else216 * Verify @pos is alive and inherit state from its parent;217 * Unlock @pos;218 * }219 * }220 *221 * As long as the inheriting step, including checking the parent state, is222 * enclosed inside @pos locking, double-locking the parent isn't necessary223 * while inheriting. The state update to the parent is guaranteed to be224 * visible by walking order and, as long as inheriting operations to the225 * same @pos are atomic to each other, multiple updates racing each other226 * still result in the correct state. It's guaranateed that at least one227 * inheritance happens for any css after the latest update to its parent.228 *229 * If checking parent's state requires locking the parent, each inheriting230 * iteration should lock and unlock both @pos->parent and @pos.231 *232 * Alternatively, a subsystem may choose to use a single global lock to233 * synchronize ->css_online() and ->css_offline() against tree-walking234 * operations.235 *236 * It is allowed to temporarily drop RCU read lock during iteration. The237 * caller is responsible for ensuring that @pos remains accessible until238 * the start of the next iteration by, for example, bumping the css refcnt.239 */240#define css_for_each_descendant_pre(pos, css) \241 for ((pos) = css_next_descendant_pre(NULL, (css)); (pos); \242 (pos) = css_next_descendant_pre((pos), (css)))243 244/**245 * css_for_each_descendant_post - post-order walk of a css's descendants246 * @pos: the css * to use as the loop cursor247 * @css: css whose descendants to walk248 *249 * Similar to css_for_each_descendant_pre() but performs post-order250 * traversal instead. @root is included in the iteration and the last251 * node to be visited.252 *253 * If a subsystem synchronizes ->css_online() and the start of iteration, a254 * css which finished ->css_online() is guaranteed to be visible in the255 * future iterations and will stay visible until the last reference is put.256 * A css which hasn't finished ->css_online() or already finished257 * ->css_offline() may show up during traversal. It's each subsystem's258 * responsibility to synchronize against on/offlining.259 *260 * Note that the walk visibility guarantee example described in pre-order261 * walk doesn't apply the same to post-order walks.262 */263#define css_for_each_descendant_post(pos, css) \264 for ((pos) = css_next_descendant_post(NULL, (css)); (pos); \265 (pos) = css_next_descendant_post((pos), (css)))266 267/**268 * cgroup_taskset_for_each - iterate cgroup_taskset269 * @task: the loop cursor270 * @dst_css: the destination css271 * @tset: taskset to iterate272 *273 * @tset may contain multiple tasks and they may belong to multiple274 * processes.275 *276 * On the v2 hierarchy, there may be tasks from multiple processes and they277 * may not share the source or destination csses.278 *279 * On traditional hierarchies, when there are multiple tasks in @tset, if a280 * task of a process is in @tset, all tasks of the process are in @tset.281 * Also, all are guaranteed to share the same source and destination csses.282 *283 * Iteration is not in any specific order.284 */285#define cgroup_taskset_for_each(task, dst_css, tset) \286 for ((task) = cgroup_taskset_first((tset), &(dst_css)); \287 (task); \288 (task) = cgroup_taskset_next((tset), &(dst_css)))289 290/**291 * cgroup_taskset_for_each_leader - iterate group leaders in a cgroup_taskset292 * @leader: the loop cursor293 * @dst_css: the destination css294 * @tset: taskset to iterate295 *296 * Iterate threadgroup leaders of @tset. For single-task migrations, @tset297 * may not contain any.298 */299#define cgroup_taskset_for_each_leader(leader, dst_css, tset) \300 for ((leader) = cgroup_taskset_first((tset), &(dst_css)); \301 (leader); \302 (leader) = cgroup_taskset_next((tset), &(dst_css))) \303 if ((leader) != (leader)->group_leader) \304 ; \305 else306 307/*308 * Inline functions.309 */310 311#ifdef CONFIG_DEBUG_CGROUP_REF312void css_get(struct cgroup_subsys_state *css);313void css_get_many(struct cgroup_subsys_state *css, unsigned int n);314bool css_tryget(struct cgroup_subsys_state *css);315bool css_tryget_online(struct cgroup_subsys_state *css);316void css_put(struct cgroup_subsys_state *css);317void css_put_many(struct cgroup_subsys_state *css, unsigned int n);318#else319#define CGROUP_REF_FN_ATTRS static inline320#define CGROUP_REF_EXPORT(fn)321#include <linux/cgroup_refcnt.h>322#endif323 324static inline u64 cgroup_id(const struct cgroup *cgrp)325{326 return cgrp->kn->id;327}328 329/**330 * css_is_dying - test whether the specified css is dying331 * @css: target css332 *333 * Test whether @css is in the process of offlining or already offline. In334 * most cases, ->css_online() and ->css_offline() callbacks should be335 * enough; however, the actual offline operations are RCU delayed and this336 * test returns %true also when @css is scheduled to be offlined.337 *338 * This is useful, for example, when the use case requires synchronous339 * behavior with respect to cgroup removal. cgroup removal schedules css340 * offlining but the css can seem alive while the operation is being341 * delayed. If the delay affects user visible semantics, this test can be342 * used to resolve the situation.343 */344static inline bool css_is_dying(struct cgroup_subsys_state *css)345{346 return !(css->flags & CSS_NO_REF) && percpu_ref_is_dying(&css->refcnt);347}348 349static inline void cgroup_get(struct cgroup *cgrp)350{351 css_get(&cgrp->self);352}353 354static inline bool cgroup_tryget(struct cgroup *cgrp)355{356 return css_tryget(&cgrp->self);357}358 359static inline void cgroup_put(struct cgroup *cgrp)360{361 css_put(&cgrp->self);362}363 364extern struct mutex cgroup_mutex;365 366static inline void cgroup_lock(void)367{368 mutex_lock(&cgroup_mutex);369}370 371static inline void cgroup_unlock(void)372{373 mutex_unlock(&cgroup_mutex);374}375 376/**377 * task_css_set_check - obtain a task's css_set with extra access conditions378 * @task: the task to obtain css_set for379 * @__c: extra condition expression to be passed to rcu_dereference_check()380 *381 * A task's css_set is RCU protected, initialized and exited while holding382 * task_lock(), and can only be modified while holding both cgroup_mutex383 * and task_lock() while the task is alive. This macro verifies that the384 * caller is inside proper critical section and returns @task's css_set.385 *386 * The caller can also specify additional allowed conditions via @__c, such387 * as locks used during the cgroup_subsys::attach() methods.388 */389#ifdef CONFIG_PROVE_RCU390#define task_css_set_check(task, __c) \391 rcu_dereference_check((task)->cgroups, \392 rcu_read_lock_sched_held() || \393 lockdep_is_held(&cgroup_mutex) || \394 lockdep_is_held(&css_set_lock) || \395 ((task)->flags & PF_EXITING) || (__c))396#else397#define task_css_set_check(task, __c) \398 rcu_dereference((task)->cgroups)399#endif400 401/**402 * task_css_check - obtain css for (task, subsys) w/ extra access conds403 * @task: the target task404 * @subsys_id: the target subsystem ID405 * @__c: extra condition expression to be passed to rcu_dereference_check()406 *407 * Return the cgroup_subsys_state for the (@task, @subsys_id) pair. The408 * synchronization rules are the same as task_css_set_check().409 */410#define task_css_check(task, subsys_id, __c) \411 task_css_set_check((task), (__c))->subsys[(subsys_id)]412 413/**414 * task_css_set - obtain a task's css_set415 * @task: the task to obtain css_set for416 *417 * See task_css_set_check().418 */419static inline struct css_set *task_css_set(struct task_struct *task)420{421 return task_css_set_check(task, false);422}423 424/**425 * task_css - obtain css for (task, subsys)426 * @task: the target task427 * @subsys_id: the target subsystem ID428 *429 * See task_css_check().430 */431static inline struct cgroup_subsys_state *task_css(struct task_struct *task,432 int subsys_id)433{434 return task_css_check(task, subsys_id, false);435}436 437/**438 * task_get_css - find and get the css for (task, subsys)439 * @task: the target task440 * @subsys_id: the target subsystem ID441 *442 * Find the css for the (@task, @subsys_id) combination, increment a443 * reference on and return it. This function is guaranteed to return a444 * valid css. The returned css may already have been offlined.445 */446static inline struct cgroup_subsys_state *447task_get_css(struct task_struct *task, int subsys_id)448{449 struct cgroup_subsys_state *css;450 451 rcu_read_lock();452 while (true) {453 css = task_css(task, subsys_id);454 /*455 * Can't use css_tryget_online() here. A task which has456 * PF_EXITING set may stay associated with an offline css.457 * If such task calls this function, css_tryget_online()458 * will keep failing.459 */460 if (likely(css_tryget(css)))461 break;462 cpu_relax();463 }464 rcu_read_unlock();465 return css;466}467 468/**469 * task_css_is_root - test whether a task belongs to the root css470 * @task: the target task471 * @subsys_id: the target subsystem ID472 *473 * Test whether @task belongs to the root css on the specified subsystem.474 * May be invoked in any context.475 */476static inline bool task_css_is_root(struct task_struct *task, int subsys_id)477{478 return task_css_check(task, subsys_id, true) ==479 init_css_set.subsys[subsys_id];480}481 482static inline struct cgroup *task_cgroup(struct task_struct *task,483 int subsys_id)484{485 return task_css(task, subsys_id)->cgroup;486}487 488static inline struct cgroup *task_dfl_cgroup(struct task_struct *task)489{490 return task_css_set(task)->dfl_cgrp;491}492 493static inline struct cgroup *cgroup_parent(struct cgroup *cgrp)494{495 struct cgroup_subsys_state *parent_css = cgrp->self.parent;496 497 if (parent_css)498 return container_of(parent_css, struct cgroup, self);499 return NULL;500}501 502/**503 * cgroup_is_descendant - test ancestry504 * @cgrp: the cgroup to be tested505 * @ancestor: possible ancestor of @cgrp506 *507 * Test whether @cgrp is a descendant of @ancestor. It also returns %true508 * if @cgrp == @ancestor. This function is safe to call as long as @cgrp509 * and @ancestor are accessible.510 */511static inline bool cgroup_is_descendant(struct cgroup *cgrp,512 struct cgroup *ancestor)513{514 if (cgrp->root != ancestor->root || cgrp->level < ancestor->level)515 return false;516 return cgrp->ancestors[ancestor->level] == ancestor;517}518 519/**520 * cgroup_ancestor - find ancestor of cgroup521 * @cgrp: cgroup to find ancestor of522 * @ancestor_level: level of ancestor to find starting from root523 *524 * Find ancestor of cgroup at specified level starting from root if it exists525 * and return pointer to it. Return NULL if @cgrp doesn't have ancestor at526 * @ancestor_level.527 *528 * This function is safe to call as long as @cgrp is accessible.529 */530static inline struct cgroup *cgroup_ancestor(struct cgroup *cgrp,531 int ancestor_level)532{533 if (ancestor_level < 0 || ancestor_level > cgrp->level)534 return NULL;535 return cgrp->ancestors[ancestor_level];536}537 538/**539 * task_under_cgroup_hierarchy - test task's membership of cgroup ancestry540 * @task: the task to be tested541 * @ancestor: possible ancestor of @task's cgroup542 *543 * Tests whether @task's default cgroup hierarchy is a descendant of @ancestor.544 * It follows all the same rules as cgroup_is_descendant, and only applies545 * to the default hierarchy.546 */547static inline bool task_under_cgroup_hierarchy(struct task_struct *task,548 struct cgroup *ancestor)549{550 struct css_set *cset = task_css_set(task);551 552 return cgroup_is_descendant(cset->dfl_cgrp, ancestor);553}554 555/* no synchronization, the result can only be used as a hint */556static inline bool cgroup_is_populated(struct cgroup *cgrp)557{558 return cgrp->nr_populated_csets + cgrp->nr_populated_domain_children +559 cgrp->nr_populated_threaded_children;560}561 562/* returns ino associated with a cgroup */563static inline ino_t cgroup_ino(struct cgroup *cgrp)564{565 return kernfs_ino(cgrp->kn);566}567 568/* cft/css accessors for cftype->write() operation */569static inline struct cftype *of_cft(struct kernfs_open_file *of)570{571 return of->kn->priv;572}573 574struct cgroup_subsys_state *of_css(struct kernfs_open_file *of);575 576/* cft/css accessors for cftype->seq_*() operations */577static inline struct cftype *seq_cft(struct seq_file *seq)578{579 return of_cft(seq->private);580}581 582static inline struct cgroup_subsys_state *seq_css(struct seq_file *seq)583{584 return of_css(seq->private);585}586 587/*588 * Name / path handling functions. All are thin wrappers around the kernfs589 * counterparts and can be called under any context.590 */591 592static inline int cgroup_name(struct cgroup *cgrp, char *buf, size_t buflen)593{594 return kernfs_name(cgrp->kn, buf, buflen);595}596 597static inline int cgroup_path(struct cgroup *cgrp, char *buf, size_t buflen)598{599 return kernfs_path(cgrp->kn, buf, buflen);600}601 602static inline void pr_cont_cgroup_name(struct cgroup *cgrp)603{604 pr_cont_kernfs_name(cgrp->kn);605}606 607static inline void pr_cont_cgroup_path(struct cgroup *cgrp)608{609 pr_cont_kernfs_path(cgrp->kn);610}611 612bool cgroup_psi_enabled(void);613 614static inline void cgroup_init_kthreadd(void)615{616 /*617 * kthreadd is inherited by all kthreads, keep it in the root so618 * that the new kthreads are guaranteed to stay in the root until619 * initialization is finished.620 */621 current->no_cgroup_migration = 1;622}623 624static inline void cgroup_kthread_ready(void)625{626 /*627 * This kthread finished initialization. The creator should have628 * set PF_NO_SETAFFINITY if this kthread should stay in the root.629 */630 current->no_cgroup_migration = 0;631}632 633void cgroup_path_from_kernfs_id(u64 id, char *buf, size_t buflen);634struct cgroup *cgroup_get_from_id(u64 id);635#else /* !CONFIG_CGROUPS */636 637struct cgroup_subsys_state;638struct cgroup;639 640static inline u64 cgroup_id(const struct cgroup *cgrp) { return 1; }641static inline void css_get(struct cgroup_subsys_state *css) {}642static inline void css_put(struct cgroup_subsys_state *css) {}643static inline void cgroup_lock(void) {}644static inline void cgroup_unlock(void) {}645static inline int cgroup_attach_task_all(struct task_struct *from,646 struct task_struct *t) { return 0; }647static inline int cgroupstats_build(struct cgroupstats *stats,648 struct dentry *dentry) { return -EINVAL; }649 650static inline void cgroup_fork(struct task_struct *p) {}651static inline int cgroup_can_fork(struct task_struct *p,652 struct kernel_clone_args *kargs) { return 0; }653static inline void cgroup_cancel_fork(struct task_struct *p,654 struct kernel_clone_args *kargs) {}655static inline void cgroup_post_fork(struct task_struct *p,656 struct kernel_clone_args *kargs) {}657static inline void cgroup_exit(struct task_struct *p) {}658static inline void cgroup_release(struct task_struct *p) {}659static inline void cgroup_free(struct task_struct *p) {}660 661static inline int cgroup_init_early(void) { return 0; }662static inline int cgroup_init(void) { return 0; }663static inline void cgroup_init_kthreadd(void) {}664static inline void cgroup_kthread_ready(void) {}665 666static inline struct cgroup *cgroup_parent(struct cgroup *cgrp)667{668 return NULL;669}670 671static inline bool cgroup_psi_enabled(void)672{673 return false;674}675 676static inline bool task_under_cgroup_hierarchy(struct task_struct *task,677 struct cgroup *ancestor)678{679 return true;680}681 682static inline void cgroup_path_from_kernfs_id(u64 id, char *buf, size_t buflen)683{}684#endif /* !CONFIG_CGROUPS */685 686#ifdef CONFIG_CGROUPS687/*688 * cgroup scalable recursive statistics.689 */690void cgroup_rstat_updated(struct cgroup *cgrp, int cpu);691void cgroup_rstat_flush(struct cgroup *cgrp);692void cgroup_rstat_flush_hold(struct cgroup *cgrp);693void cgroup_rstat_flush_release(struct cgroup *cgrp);694 695/*696 * Basic resource stats.697 */698#ifdef CONFIG_CGROUP_CPUACCT699void cpuacct_charge(struct task_struct *tsk, u64 cputime);700void cpuacct_account_field(struct task_struct *tsk, int index, u64 val);701#else702static inline void cpuacct_charge(struct task_struct *tsk, u64 cputime) {}703static inline void cpuacct_account_field(struct task_struct *tsk, int index,704 u64 val) {}705#endif706 707void __cgroup_account_cputime(struct cgroup *cgrp, u64 delta_exec);708void __cgroup_account_cputime_field(struct cgroup *cgrp,709 enum cpu_usage_stat index, u64 delta_exec);710 711static inline void cgroup_account_cputime(struct task_struct *task,712 u64 delta_exec)713{714 struct cgroup *cgrp;715 716 cpuacct_charge(task, delta_exec);717 718 cgrp = task_dfl_cgroup(task);719 if (cgroup_parent(cgrp))720 __cgroup_account_cputime(cgrp, delta_exec);721}722 723static inline void cgroup_account_cputime_field(struct task_struct *task,724 enum cpu_usage_stat index,725 u64 delta_exec)726{727 struct cgroup *cgrp;728 729 cpuacct_account_field(task, index, delta_exec);730 731 cgrp = task_dfl_cgroup(task);732 if (cgroup_parent(cgrp))733 __cgroup_account_cputime_field(cgrp, index, delta_exec);734}735 736#else /* CONFIG_CGROUPS */737 738static inline void cgroup_account_cputime(struct task_struct *task,739 u64 delta_exec) {}740static inline void cgroup_account_cputime_field(struct task_struct *task,741 enum cpu_usage_stat index,742 u64 delta_exec) {}743 744#endif /* CONFIG_CGROUPS */745 746/*747 * sock->sk_cgrp_data handling. For more info, see sock_cgroup_data748 * definition in cgroup-defs.h.749 */750#ifdef CONFIG_SOCK_CGROUP_DATA751 752void cgroup_sk_alloc(struct sock_cgroup_data *skcd);753void cgroup_sk_clone(struct sock_cgroup_data *skcd);754void cgroup_sk_free(struct sock_cgroup_data *skcd);755 756static inline struct cgroup *sock_cgroup_ptr(struct sock_cgroup_data *skcd)757{758 return skcd->cgroup;759}760 761#else /* CONFIG_CGROUP_DATA */762 763static inline void cgroup_sk_alloc(struct sock_cgroup_data *skcd) {}764static inline void cgroup_sk_clone(struct sock_cgroup_data *skcd) {}765static inline void cgroup_sk_free(struct sock_cgroup_data *skcd) {}766 767#endif /* CONFIG_CGROUP_DATA */768 769struct cgroup_namespace {770 struct ns_common ns;771 struct user_namespace *user_ns;772 struct ucounts *ucounts;773 struct css_set *root_cset;774};775 776extern struct cgroup_namespace init_cgroup_ns;777 778#ifdef CONFIG_CGROUPS779 780void free_cgroup_ns(struct cgroup_namespace *ns);781 782struct cgroup_namespace *copy_cgroup_ns(unsigned long flags,783 struct user_namespace *user_ns,784 struct cgroup_namespace *old_ns);785 786int cgroup_path_ns(struct cgroup *cgrp, char *buf, size_t buflen,787 struct cgroup_namespace *ns);788 789#else /* !CONFIG_CGROUPS */790 791static inline void free_cgroup_ns(struct cgroup_namespace *ns) { }792static inline struct cgroup_namespace *793copy_cgroup_ns(unsigned long flags, struct user_namespace *user_ns,794 struct cgroup_namespace *old_ns)795{796 return old_ns;797}798 799#endif /* !CONFIG_CGROUPS */800 801static inline void get_cgroup_ns(struct cgroup_namespace *ns)802{803 if (ns)804 refcount_inc(&ns->ns.count);805}806 807static inline void put_cgroup_ns(struct cgroup_namespace *ns)808{809 if (ns && refcount_dec_and_test(&ns->ns.count))810 free_cgroup_ns(ns);811}812 813#ifdef CONFIG_CGROUPS814 815void cgroup_enter_frozen(void);816void cgroup_leave_frozen(bool always_leave);817void cgroup_update_frozen(struct cgroup *cgrp);818void cgroup_freeze(struct cgroup *cgrp, bool freeze);819void cgroup_freezer_migrate_task(struct task_struct *task, struct cgroup *src,820 struct cgroup *dst);821 822static inline bool cgroup_task_frozen(struct task_struct *task)823{824 return task->frozen;825}826 827#else /* !CONFIG_CGROUPS */828 829static inline void cgroup_enter_frozen(void) { }830static inline void cgroup_leave_frozen(bool always_leave) { }831static inline bool cgroup_task_frozen(struct task_struct *task)832{833 return false;834}835 836#endif /* !CONFIG_CGROUPS */837 838#ifdef CONFIG_CGROUP_BPF839static inline void cgroup_bpf_get(struct cgroup *cgrp)840{841 percpu_ref_get(&cgrp->bpf.refcnt);842}843 844static inline void cgroup_bpf_put(struct cgroup *cgrp)845{846 percpu_ref_put(&cgrp->bpf.refcnt);847}848 849#else /* CONFIG_CGROUP_BPF */850 851static inline void cgroup_bpf_get(struct cgroup *cgrp) {}852static inline void cgroup_bpf_put(struct cgroup *cgrp) {}853 854#endif /* CONFIG_CGROUP_BPF */855 856struct cgroup *task_get_cgroup1(struct task_struct *tsk, int hierarchy_id);857 858struct cgroup_of_peak *of_peak(struct kernfs_open_file *of);859 860#endif /* _LINUX_CGROUP_H */861