Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) /* SPDX-License-Identifier: GPL-2.0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) #ifndef __CGROUP_INTERNAL_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3) #define __CGROUP_INTERNAL_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5) #include <linux/cgroup.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) #include <linux/kernfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) #include <linux/workqueue.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/list.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/refcount.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/fs_parser.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #define TRACE_CGROUP_PATH_LEN 1024
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) extern spinlock_t trace_cgroup_path_lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) extern char trace_cgroup_path[TRACE_CGROUP_PATH_LEN];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) extern bool cgroup_debug;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) extern void __init enable_debug_cgroup(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19)  * cgroup_path() takes a spin lock. It is good practice not to take
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20)  * spin locks within trace point handlers, as they are mostly hidden
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21)  * from normal view. As cgroup_path() can take the kernfs_rename_lock
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22)  * spin lock, it is best to not call that function from the trace event
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23)  * handler.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25)  * Note: trace_cgroup_##type##_enabled() is a static branch that will only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26)  *       be set when the trace event is enabled.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #define TRACE_CGROUP_PATH(type, cgrp, ...)				\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	do {								\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 		if (trace_cgroup_##type##_enabled()) {			\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 			unsigned long flags;				\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 			spin_lock_irqsave(&trace_cgroup_path_lock,	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 					  flags);			\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 			cgroup_path(cgrp, trace_cgroup_path,		\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 				    TRACE_CGROUP_PATH_LEN);		\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 			trace_cgroup_##type(cgrp, trace_cgroup_path,	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 					    ##__VA_ARGS__);		\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 			spin_unlock_irqrestore(&trace_cgroup_path_lock, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 					       flags);			\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 		}							\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	} while (0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44)  * The cgroup filesystem superblock creation/mount context.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) struct cgroup_fs_context {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	struct kernfs_fs_context kfc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	struct cgroup_root	*root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	struct cgroup_namespace	*ns;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	unsigned int	flags;			/* CGRP_ROOT_* flags */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	/* cgroup1 bits */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	bool		cpuset_clone_children;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	bool		none;			/* User explicitly requested empty subsystem */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	bool		all_ss;			/* Seen 'all' option */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	u16		subsys_mask;		/* Selected subsystems */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	char		*name;			/* Hierarchy name */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	char		*release_agent;		/* Path for release notifications */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) static inline struct cgroup_fs_context *cgroup_fc2context(struct fs_context *fc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	struct kernfs_fs_context *kfc = fc->fs_private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	return container_of(kfc, struct cgroup_fs_context, kfc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) struct cgroup_pidlist;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) struct cgroup_file_ctx {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	struct cgroup_namespace	*ns;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	struct {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 		void			*trigger;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	} psi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	struct {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 		bool			started;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 		struct css_task_iter	iter;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	} procs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	struct {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 		struct cgroup_pidlist	*pidlist;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	} procs1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88)  * A cgroup can be associated with multiple css_sets as different tasks may
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89)  * belong to different cgroups on different hierarchies.  In the other
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90)  * direction, a css_set is naturally associated with multiple cgroups.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91)  * This M:N relationship is represented by the following link structure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92)  * which exists for each association and allows traversing the associations
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93)  * from both sides.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) struct cgrp_cset_link {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	/* the cgroup and css_set this link associates */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	struct cgroup		*cgrp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	struct css_set		*cset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	/* list of cgrp_cset_links anchored at cgrp->cset_links */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	struct list_head	cset_link;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	/* list of cgrp_cset_links anchored at css_set->cgrp_links */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	struct list_head	cgrp_link;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) /* used to track tasks and csets during migration */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) struct cgroup_taskset {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	/* the src and dst cset list running through cset->mg_node */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	struct list_head	src_csets;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	struct list_head	dst_csets;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	/* the number of tasks in the set */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	int			nr_tasks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	/* the subsys currently being processed */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	int			ssid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	 * Fields for cgroup_taskset_*() iteration.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	 * Before migration is committed, the target migration tasks are on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	 * ->mg_tasks of the csets on ->src_csets.  After, on ->mg_tasks of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	 * the csets on ->dst_csets.  ->csets point to either ->src_csets
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	 * or ->dst_csets depending on whether migration is committed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	 * ->cur_csets and ->cur_task point to the current task position
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	 * during iteration.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	struct list_head	*csets;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	struct css_set		*cur_cset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	struct task_struct	*cur_task;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) /* migration context also tracks preloading */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) struct cgroup_mgctx {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	 * Preloaded source and destination csets.  Used to guarantee
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	 * atomic success or failure on actual migration.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	struct list_head	preloaded_src_csets;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	struct list_head	preloaded_dst_csets;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	/* tasks and csets to migrate */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	struct cgroup_taskset	tset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	/* subsystems affected by migration */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	u16			ss_mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) #define CGROUP_TASKSET_INIT(tset)						\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) {										\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	.src_csets		= LIST_HEAD_INIT(tset.src_csets),		\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	.dst_csets		= LIST_HEAD_INIT(tset.dst_csets),		\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	.csets			= &tset.src_csets,				\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) #define CGROUP_MGCTX_INIT(name)							\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) {										\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	LIST_HEAD_INIT(name.preloaded_src_csets),				\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	LIST_HEAD_INIT(name.preloaded_dst_csets),				\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	CGROUP_TASKSET_INIT(name.tset),						\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) #define DEFINE_CGROUP_MGCTX(name)						\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	struct cgroup_mgctx name = CGROUP_MGCTX_INIT(name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) extern struct mutex cgroup_mutex;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) extern spinlock_t css_set_lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) extern struct cgroup_subsys *cgroup_subsys[];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) extern struct list_head cgroup_roots;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) extern struct file_system_type cgroup_fs_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) /* iterate across the hierarchies */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) #define for_each_root(root)						\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	list_for_each_entry((root), &cgroup_roots, root_list)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179)  * for_each_subsys - iterate all enabled cgroup subsystems
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)  * @ss: the iteration cursor
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)  * @ssid: the index of @ss, CGROUP_SUBSYS_COUNT after reaching the end
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) #define for_each_subsys(ss, ssid)					\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	for ((ssid) = 0; (ssid) < CGROUP_SUBSYS_COUNT &&		\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	     (((ss) = cgroup_subsys[ssid]) || true); (ssid)++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) static inline bool cgroup_is_dead(const struct cgroup *cgrp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	return !(cgrp->self.flags & CSS_ONLINE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) static inline bool notify_on_release(const struct cgroup *cgrp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	return test_bit(CGRP_NOTIFY_ON_RELEASE, &cgrp->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) void put_css_set_locked(struct css_set *cset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) static inline void put_css_set(struct css_set *cset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	 * Ensure that the refcount doesn't hit zero while any readers
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	 * can see it. Similar to atomic_dec_and_lock(), but for an
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	 * rwlock
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	if (refcount_dec_not_one(&cset->refcount))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	spin_lock_irqsave(&css_set_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	put_css_set_locked(cset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	spin_unlock_irqrestore(&css_set_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217)  * refcounted get/put for css_set objects
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) static inline void get_css_set(struct css_set *cset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	refcount_inc(&cset->refcount);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) bool cgroup_ssid_enabled(int ssid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) bool cgroup_on_dfl(const struct cgroup *cgrp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) bool cgroup_is_thread_root(struct cgroup *cgrp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) bool cgroup_is_threaded(struct cgroup *cgrp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) struct cgroup_root *cgroup_root_from_kf(struct kernfs_root *kf_root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) struct cgroup *task_cgroup_from_root(struct task_struct *task,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 				     struct cgroup_root *root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) struct cgroup *cgroup_kn_lock_live(struct kernfs_node *kn, bool drain_offline);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) void cgroup_kn_unlock(struct kernfs_node *kn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) int cgroup_path_ns_locked(struct cgroup *cgrp, char *buf, size_t buflen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 			  struct cgroup_namespace *ns);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) void cgroup_free_root(struct cgroup_root *root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) void init_cgroup_root(struct cgroup_fs_context *ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) int cgroup_setup_root(struct cgroup_root *root, u16 ss_mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) int rebind_subsystems(struct cgroup_root *dst_root, u16 ss_mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) int cgroup_do_get_tree(struct fs_context *fc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) int cgroup_migrate_vet_dst(struct cgroup *dst_cgrp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) void cgroup_migrate_finish(struct cgroup_mgctx *mgctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) void cgroup_migrate_add_src(struct css_set *src_cset, struct cgroup *dst_cgrp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 			    struct cgroup_mgctx *mgctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) int cgroup_migrate_prepare_dst(struct cgroup_mgctx *mgctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) int cgroup_migrate(struct task_struct *leader, bool threadgroup,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 		   struct cgroup_mgctx *mgctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) int cgroup_attach_task(struct cgroup *dst_cgrp, struct task_struct *leader,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 		       bool threadgroup);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) struct task_struct *cgroup_procs_write_start(char *buf, bool threadgroup,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 					     bool *locked,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 					     struct cgroup *dst_cgrp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	__acquires(&cgroup_threadgroup_rwsem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) void cgroup_procs_write_finish(struct task_struct *task, bool locked)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	__releases(&cgroup_threadgroup_rwsem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) void cgroup_lock_and_drain_offline(struct cgroup *cgrp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) int cgroup_mkdir(struct kernfs_node *parent_kn, const char *name, umode_t mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) int cgroup_rmdir(struct kernfs_node *kn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) int cgroup_show_path(struct seq_file *sf, struct kernfs_node *kf_node,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 		     struct kernfs_root *kf_root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) int __cgroup_task_count(const struct cgroup *cgrp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) int cgroup_task_count(const struct cgroup *cgrp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271)  * rstat.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) int cgroup_rstat_init(struct cgroup *cgrp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) void cgroup_rstat_exit(struct cgroup *cgrp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) void cgroup_rstat_boot(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) void cgroup_base_stat_cputime_show(struct seq_file *seq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279)  * namespace.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) extern const struct proc_ns_operations cgroupns_operations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284)  * cgroup-v1.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) extern struct cftype cgroup1_base_files[];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) extern struct kernfs_syscall_ops cgroup1_kf_syscall_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) extern const struct fs_parameter_spec cgroup1_fs_parameters[];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) int proc_cgroupstats_show(struct seq_file *m, void *v);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) bool cgroup1_ssid_disabled(int ssid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) void cgroup1_pidlist_destroy_all(struct cgroup *cgrp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) void cgroup1_release_agent(struct work_struct *work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) void cgroup1_check_for_release(struct cgroup *cgrp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) int cgroup1_parse_param(struct fs_context *fc, struct fs_parameter *param);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) int cgroup1_get_tree(struct fs_context *fc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) int cgroup1_reconfigure(struct fs_context *ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) #endif /* __CGROUP_INTERNAL_H */