#ifndef _LINUX_CGROUP_H#define _LINUX_CGROUP_H/* *  cgroup interface * *  Copyright (C) 2003 BULL SA *  Copyright (C) 2004-2006 Silicon Graphics, Inc. * */ #include <linux/sched.h>#include <linux/cpumask.h>#include <linux/nodemask.h>#include <linux/rcupdate.h>#include <linux/rculist.h>#include <linux/cgroupstats.h>#include <linux/prio_heap.h>#include <linux/rwsem.h>#include <linux/idr.h>#include <linux/workqueue.h>#include <linux/xattr.h> #ifdef CONFIG_CGROUPS struct cgroupfs_root;struct cgroup_subsys;struct inode;struct cgroup;struct css_id; extern int cgroup_init_early(void);extern int cgroup_init(void);extern void cgroup_lock(void);extern int cgroup_lock_is_held(void);extern bool cgroup_lock_live_group(struct cgroup *cgrp);extern void cgroup_unlock(void);extern void cgroup_fork(struct task_struct *p);extern void cgroup_post_fork(struct task_struct *p);extern void cgroup_exit(struct task_struct *p, int run_callbacks);extern int cgroupstats_build(struct cgroupstats *stats,				struct dentry *dentry);extern int cgroup_load_subsys(struct cgroup_subsys *ss);extern void cgroup_unload_subsys(struct cgroup_subsys *ss); extern const struct file_operations proc_cgroup_operations; /* Define the enumeration of all builtin cgroup subsystems */#define SUBSYS(_x) _x ## _subsys_id,#define IS_SUBSYS_ENABLED(option) IS_ENABLED(option)enum cgroup_subsys_id {#include <linux/cgroup_subsys.h>	CGROUP_SUBSYS_COUNT,};#undef IS_SUBSYS_ENABLED#undef SUBSYS /* Per-subsystem/per-cgroup state maintained by the system. */struct cgroup_subsys_state {	/*	 * The cgroup that this subsystem is attached to. Useful	 * for subsystems that want to know about the cgroup	 * hierarchy structure	 */	struct cgroup *cgroup; 	/*	 * State maintained by the cgroup system to allow subsystems	 * to be "busy". Should be accessed via css_get(),	 * css_tryget() and css_put().	 */ 	atomic_t refcnt; 	unsigned long flags;	/* ID for this css, if possible */	struct css_id __rcu *id; 	/* Used to put @cgroup->dentry on the last css_put() */	struct work_struct dput_work;}; /* bits in struct cgroup_subsys_state flags field */enum {	CSS_ROOT	= (1 << 0), /* this CSS is the root of the subsystem */	CSS_ONLINE	= (1 << 1), /* between ->css_online() and ->css_offline() */}; /* Caller must verify that the css is not for root cgroup */static inline void __css_get(struct cgroup_subsys_state *css, int count){	atomic_add(count, &css->refcnt);} /* * Call css_get() to hold a reference on the css; it can be used * for a reference obtained via: * - an existing ref-counted reference to the css * - task->cgroups for a locked task */ static inline void css_get(struct cgroup_subsys_state *css){	/* We don't need to reference count the root state */	if (!(css->flags & CSS_ROOT))		__css_get(css, 1);} /* * Call css_tryget() to take a reference on a css if your existing * (known-valid) reference isn't already ref-counted. Returns false if * the css has been destroyed. */ extern bool __css_tryget(struct cgroup_subsys_state *css);static inline bool css_tryget(struct cgroup_subsys_state *css){	if (css->flags & CSS_ROOT)		return true;	return __css_tryget(css);} /* * css_put() should be called to release a reference taken by * css_get() or css_tryget() */ extern void __css_put(struct cgroup_subsys_state *css);static inline void css_put(struct cgroup_subsys_state *css){	if (!(css->flags & CSS_ROOT))		__css_put(css);} /* bits in struct cgroup flags field */enum {	/* Control Group is dead */	CGRP_REMOVED,	/*	 * Control Group has previously had a child cgroup or a task,	 * but no longer (only if CGRP_NOTIFY_ON_RELEASE is set)	 */	CGRP_RELEASABLE,	/* 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,}; struct cgroup {	unsigned long flags;		/* "unsigned long" so bitops work */ 	/*	 * count users of this cgroup. >0 means busy, but doesn't	 * necessarily indicate the number of tasks in the cgroup	 */	atomic_t count; 	int id;				/* ida allocated in-hierarchy ID */ 	/*	 * We link our 'sibling' struct into our parent's 'children'.	 * Our children link their 'sibling' into our 'children'.	 */	struct list_head sibling;	/* my parent's children */	struct list_head children;	/* my children */	struct list_head files;		/* my files */ 	struct cgroup *parent;		/* my parent */	struct dentry *dentry;		/* cgroup fs entry, RCU protected */ 	/* Private pointers for each registered subsystem */	struct cgroup_subsys_state *subsys[CGROUP_SUBSYS_COUNT]; 	struct cgroupfs_root *root;	struct cgroup *top_cgroup; 	/*	 * List of cg_cgroup_links pointing at css_sets with	 * tasks in this cgroup. Protected by css_set_lock	 */	struct list_head css_sets; 	struct list_head allcg_node;	/* cgroupfs_root->allcg_list */	struct list_head cft_q_node;	/* used during cftype add/rm */ 	/*	 * Linked list running through all cgroups that can	 * potentially be reaped by the release agent. Protected by	 * release_list_lock	 */	struct list_head release_list; 	/*	 * list of pidlists, up to two for each namespace (one for procs, one	 * for tasks); created on demand.	 */	struct list_head pidlists;	struct mutex pidlist_mutex; 	/* For RCU-protected deletion */	struct rcu_head rcu_head; 	/* List of events which userspace want to receive */	struct list_head event_list;	spinlock_t event_list_lock; 	/* directory xattrs */	struct simple_xattrs xattrs;}; /* * A css_set is a structure holding pointers to a set of * cgroup_subsys_state objects. This saves space in the task struct * object and speeds up fork()/exit(), since a single inc/dec and a * list_add()/del() can bump the reference count on the entire cgroup * set for a task. */ struct css_set { 	/* Reference count */	atomic_t refcount; 	/*	 * List running through all cgroup groups in the same hash	 * slot. Protected by css_set_lock	 */	struct hlist_node hlist; 	/*	 * List running through all tasks using this cgroup	 * group. Protected by css_set_lock	 */	struct list_head tasks; 	/*	 * List of cg_cgroup_link objects on link chains from	 * cgroups referenced from this css_set. Protected by	 * css_set_lock	 */	struct list_head cg_links; 	/*	 * Set of subsystem states, one for each subsystem. This array	 * is immutable after creation apart from the init_css_set	 * during subsystem registration (at boot time) and modular subsystem	 * loading/unloading.	 */	struct cgroup_subsys_state *subsys[CGROUP_SUBSYS_COUNT]; 	/* For RCU-protected deletion */	struct rcu_head rcu_head;}; /* * cgroup_map_cb is an abstract callback API for reporting map-valued * control files */ struct cgroup_map_cb {	int (*fill)(struct cgroup_map_cb *cb, const char *key, u64 value);	void *state;}; /* * struct cftype: handler definitions for cgroup control files * * When reading/writing to a file: *	- the cgroup to use is file->f_dentry->d_parent->d_fsdata *	- the 'cftype' of the file is file->f_dentry->d_fsdata */ /* cftype->flags */#define CFTYPE_ONLY_ON_ROOT	(1U << 0)	/* only create on root cg */#define CFTYPE_NOT_ON_ROOT	(1U << 1)	/* don't create on root cg */ #define MAX_CFTYPE_NAME		64 struct cftype {	/*	 * By convention, the name should begin with the name of the	 * subsystem, followed by a period.  Zero length string indicates	 * end of cftype array.	 */	char name[MAX_CFTYPE_NAME];	int private;	/*	 * If not 0, file mode is set to this value, otherwise it will	 * be figured out automatically	 */	umode_t mode; 	/*	 * If non-zero, defines the maximum length of string that can	 * be passed to write_string; defaults to 64	 */	size_t max_write_len; 	/* CFTYPE_* flags */	unsigned int flags; 	/* file xattrs */	struct simple_xattrs xattrs; 	int (*open)(struct inode *inode, struct file *file);	ssize_t (*read)(struct cgroup *cgrp, struct cftype *cft,			struct file *file,			char __user *buf, size_t nbytes, loff_t *ppos);	/*	 * read_u64() is a shortcut for the common case of returning a	 * single integer. Use it in place of read()	 */	u64 (*read_u64)(struct cgroup *cgrp, struct cftype *cft);	/*	 * read_s64() is a signed version of read_u64()	 */	s64 (*read_s64)(struct cgroup *cgrp, struct cftype *cft);	/*	 * read_map() is used for defining a map of key/value	 * pairs. It should call cb->fill(cb, key, value) for each	 * entry. The key/value pairs (and their ordering) should not	 * change between reboots.	 */	int (*read_map)(struct cgroup *cont, struct cftype *cft,			struct cgroup_map_cb *cb);	/*	 * read_seq_string() is used for outputting a simple sequence	 * using seqfile.	 */	int (*read_seq_string)(struct cgroup *cont, struct cftype *cft,			       struct seq_file *m); 	ssize_t (*write)(struct cgroup *cgrp, struct cftype *cft,			 struct file *file,			 const char __user *buf, size_t nbytes, loff_t *ppos); 	/*	 * write_u64() is a shortcut for the common case of accepting	 * a single integer (as parsed by simple_strtoull) from	 * userspace. Use in place of write(); return 0 or error.	 */	int (*write_u64)(struct cgroup *cgrp, struct cftype *cft, u64 val);	/*	 * write_s64() is a signed version of write_u64()	 */	int (*write_s64)(struct cgroup *cgrp, struct cftype *cft, s64 val); 	/*	 * write_string() is passed a nul-terminated kernelspace	 * buffer of maximum length determined by max_write_len.	 * Returns 0 or -ve error code.	 */	int (*write_string)(struct cgroup *cgrp, struct cftype *cft,			    const char *buffer);	/*	 * trigger() callback can be used to get some kick from the	 * userspace, when the actual string written is not important	 * at all. The private field can be used to determine the	 * kick type for multiplexing.	 */	int (*trigger)(struct cgroup *cgrp, unsigned int event); 	int (*release)(struct inode *inode, struct file *file); 	/*	 * register_event() callback will be used to add new userspace	 * waiter for changes related to the cftype. Implement it if	 * you want to provide this functionality. Use eventfd_signal()	 * on eventfd to send notification to userspace.	 */	int (*register_event)(struct cgroup *cgrp, struct cftype *cft,			struct eventfd_ctx *eventfd, const char *args);	/*	 * unregister_event() callback will be called when userspace	 * closes the eventfd or on cgroup removing.	 * This callback must be implemented, if you want provide	 * notification functionality.	 */	void (*unregister_event)(struct cgroup *cgrp, struct cftype *cft,			struct eventfd_ctx *eventfd);}; /* * cftype_sets describe cftypes belonging to a subsystem and are chained at * cgroup_subsys->cftsets.  Each cftset points to an array of cftypes * terminated by zero length name. */struct cftype_set {	struct list_head		node;	/* chained at subsys->cftsets */	struct cftype			*cfts;}; struct cgroup_scanner {	struct cgroup *cg;	int (*test_task)(struct task_struct *p, struct cgroup_scanner *scan);	void (*process_task)(struct task_struct *p,			struct cgroup_scanner *scan);	struct ptr_heap *heap;	void *data;}; int cgroup_add_cftypes(struct cgroup_subsys *ss, struct cftype *cfts);int cgroup_rm_cftypes(struct cgroup_subsys *ss, struct cftype *cfts); int cgroup_is_removed(const struct cgroup *cgrp); int cgroup_path(const struct cgroup *cgrp, char *buf, int buflen); int cgroup_task_count(const struct cgroup *cgrp); /* Return true if cgrp is a descendant of the task's cgroup */int cgroup_is_descendant(const struct cgroup *cgrp, struct task_struct *task); /* * Control Group taskset, used to pass around set of tasks to cgroup_subsys * methods. */struct cgroup_taskset;struct task_struct *cgroup_taskset_first(struct cgroup_taskset *tset);struct task_struct *cgroup_taskset_next(struct cgroup_taskset *tset);struct cgroup *cgroup_taskset_cur_cgroup(struct cgroup_taskset *tset);int cgroup_taskset_size(struct cgroup_taskset *tset); /** * cgroup_taskset_for_each - iterate cgroup_taskset * @task: the loop cursor * @skip_cgrp: skip if task's cgroup matches this, %NULL to iterate through all * @tset: taskset to iterate */#define cgroup_taskset_for_each(task, skip_cgrp, tset)			\	for ((task) = cgroup_taskset_first((tset)); (task);		\	     (task) = cgroup_taskset_next((tset)))			\		if (!(skip_cgrp) ||					\		    cgroup_taskset_cur_cgroup((tset)) != (skip_cgrp)) /* * Control Group subsystem type. * See Documentation/cgroups/cgroups.txt for details */ struct cgroup_subsys {	struct cgroup_subsys_state *(*css_alloc)(struct cgroup *cgrp);	int (*css_online)(struct cgroup *cgrp);	void (*css_offline)(struct cgroup *cgrp);	void (*css_free)(struct cgroup *cgrp); 	int (*can_attach)(struct cgroup *cgrp, struct cgroup_taskset *tset);	void (*cancel_attach)(struct cgroup *cgrp, struct cgroup_taskset *tset);	void (*attach)(struct cgroup *cgrp, struct cgroup_taskset *tset);	void (*fork)(struct task_struct *task);	void (*exit)(struct cgroup *cgrp, struct cgroup *old_cgrp,		     struct task_struct *task);	void (*bind)(struct cgroup *root); 	int subsys_id;	int active;	int disabled;	int early_init;	/*	 * True if this subsys uses ID. ID is not available before cgroup_init()	 * (not available in early_init time.)	 */	bool use_id; 	/*	 * If %false, this subsystem is properly hierarchical -	 * configuration, resource accounting and restriction on a parent	 * cgroup cover those of its children.  If %true, hierarchy support	 * is broken in some ways - some subsystems ignore hierarchy	 * completely while others are only implemented half-way.	 *	 * It's now disallowed to create nested cgroups if the subsystem is	 * broken and cgroup core will emit a warning message on such	 * cases.  Eventually, all subsystems will be made properly	 * hierarchical and this will go away.	 */	bool broken_hierarchy;	bool warned_broken_hierarchy; #define MAX_CGROUP_TYPE_NAMELEN 32	const char *name; 	/*	 * Link to parent, and list entry in parent's children.	 * Protected by cgroup_lock()	 */	struct cgroupfs_root *root;	struct list_head sibling;	/* used when use_id == true */	struct idr idr;	spinlock_t id_lock; 	/* list of cftype_sets */	struct list_head cftsets; 	/* base cftypes, automatically [de]registered with subsys itself */

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