
     +€ВГ„¬ІБїЖ ?ч     +/* SPDX-License-Identifier: GPL-2.0 */
/*
 * linux/cgroup-defs.h - basic definitions for cgroup
 *
 * This file provides basic type and interface.  Include this file directly
 * only if necessary to avoid cyclic dependencies.
 */
#ifndef _LINUX_CGROUP_DEFS_H
#define _LINUX_CGROUP_DEFS_H

#include <linux/limits.h>
#include <linux/list.h>
#include <linux/idr.h>
#include <linux/wait.h>
#include <linux/mutex.h>
#include <linux/rcupdate.h>
#include <linux/refcount.h>
#include <linux/percpu-refcount.h>
#include <linux/percpu-rwsem.h>
#include <linux/u64_stats_sync.h>
#include <linux/workqueue.h>
#include <linux/bpf-cgroup-defs.h>
#include <linux/psi_types.h>

#ifdef CONFIG_CGROUPS

struct cgroup;
struct cgroup_root;
struct cgroup_subsys;
struct cgroup_taskset;
struct kernfs_node;
struct kernfs_ops;
struct kernfs_open_file;
struct seq_file;
struct poll_table_struct;

#define MAX_CGROUP_TYPE_NAMELEN 32
#define MAX_CGROUP_ROOT_NAMELEN 64
#define MAX_CFTYPE_NAME		64

/* define the enumeration of all cgroup subsystems */
#define SUBSYS(_x) _x ## _cgrp_id,
enum cgroup_subsys_id {
#include <linux/cgroup_subsys.h>
	CGROUP_SUBSYS_COUNT,
};
#undef SUBSYS

/* bits in struct cgroup_subsys_state flags field */
enum {
	CSS_NO_REF	= (1 << 0), /* no reference counting for this css */
	CSS_ONLINE	= (1 << 1), /* between ->css_online() and ->css_offline() */
	CSS_RELEASED	= (1 << 2), /* refcnt reached zero, released */
	CSS_VISIBLE	= (1 << 3), /* css is visible to userland */
	CSS_DYING	= (1 << 4), /* css is dying */
};

/* bits in struct cgroup flags field */
enum {
	/* Control Group requires release notifications to userspace */
	CGRP_NOTIFY_ON_RELEASE,
	/*
	 * Clone the parent's configuration when creating a new child
	 * cpuset cgroup.  For historical reasons, this option can be
	 * specified at mount time and thus is implemented here.
	 */
	CGRP_CPUSET_CLONE_CHILDREN,

	/* Control group has to be frozen. */
	CGRP_FREEZE,

	/* Cgroup is frozen. */
	CGRP_FROZEN,

	/* Control group has to be killed. */
	CGRP_KILL,
};

/* cgroup_root->flags */
enum {
	CGRP_ROOT_NOPREFIX	= (1 << 1), /* mounted subsystems have no named prefix */
	CGRP_ROOT_XATTR		= (1 << 2), /* supports extended attributes */

	/*
	 * Consider namespaces as delegation boundaries.  If this flag is
	 * set, controller specific interface files in a namespace root
	 * aren't writeable from inside the namespace.
	 */
	CGRP_ROOT_NS_DELEGATE	= (1 << 3),

	/*
	 * Reduce latencies on dynamic cgroup modifications such as task
	 * migrations and controller on/offs by disabling percpu operation on
	 * cgroup_threadgroup_rwsem. This makes hot path operations such as
	 * forks and exits into the slow path and more expensive.
	 *
	 * The static usage pattern of creating a cgroup, enabling controllers,
	 * and then seeding it with CLONE_INTO_CGROUP doesn't require write
	 * locking cgroup_threadgroup_rwsem and thus doesn't benefit from
	 * favordynmod.
	 */
	CGRP_ROOT_FAVOR_DYNMODS = (1 << 4),

	/*
	 * Enable cpuset controller in v1 cgroup to use v2 behavior.
	 */
	CGRP_ROOT_CPUSET_V2_MODE = (1 << 16),

	/*
	 * Enable legacy local memory.events.
	 */
	CGRP_ROOT_MEMORY_LOCAL_EVENTS = (1 << 17),

	/*
	 * Enable recursive subtree protection
	 */
	CGRP_ROOT_MEMORY_RECURSIVE_PROT = (1 << 18),

	/*
	 * Enable hugetlb accounting for the memory controller.
	 */
	CGRP_ROOT_MEMORY_HUGETLB_ACCOUNTING = (1 << 19),

	/*
	 * Enable legacy local pids.events.
	 */
	CGRP_ROOT_PIDS_LOCAL_EVENTS = (1 << 20),
};

/* cftype->flags */
enum {
	CFTYPE_ONLY_ON_ROOT	= (1 << 0),	/* only create on root cgrp */
	CFTYPE_NOT_ON_ROOT	= (1 << 1),	/* don't create on root cgrp */
	CFTYPE_NS_DELEGATABLE	= (1 << 2),	/* writeable beyond delegation boundaries */

	CFTYPE_NO_PREFIX	= (1 << 3),	/* (DON'T USE FOR NEW FILES) no subsys prefix */
	CFTYPE_WORLD_WRITABLE	= (1 << 4),	/* (DON'T USE FOR NEW FILES) S_IWUGO */
	CFTYPE_DEBUG		= (1 << 5),	/* create when cgroup_debug */

	/* internal flags, do not use outside cgroup core proper */
	__CFTYPE_ONLY_ON_DFL	= (1 << 16),	/* only on default hierarchy */
	__C