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279 lines
8.6 KiB
279 lines
8.6 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef __CGROUP_INTERNAL_H |
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#define __CGROUP_INTERNAL_H |
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#include <linux/cgroup.h> |
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#include <linux/kernfs.h> |
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#include <linux/workqueue.h> |
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#include <linux/list.h> |
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#include <linux/refcount.h> |
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#include <linux/fs_parser.h> |
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#define TRACE_CGROUP_PATH_LEN 1024 |
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extern spinlock_t trace_cgroup_path_lock; |
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extern char trace_cgroup_path[TRACE_CGROUP_PATH_LEN]; |
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extern bool cgroup_debug; |
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extern void __init enable_debug_cgroup(void); |
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/* |
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* cgroup_path() takes a spin lock. It is good practice not to take |
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* spin locks within trace point handlers, as they are mostly hidden |
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* from normal view. As cgroup_path() can take the kernfs_rename_lock |
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* spin lock, it is best to not call that function from the trace event |
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* handler. |
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* |
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* Note: trace_cgroup_##type##_enabled() is a static branch that will only |
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* be set when the trace event is enabled. |
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*/ |
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#define TRACE_CGROUP_PATH(type, cgrp, ...) \ |
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do { \ |
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if (trace_cgroup_##type##_enabled()) { \ |
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unsigned long flags; \ |
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spin_lock_irqsave(&trace_cgroup_path_lock, \ |
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flags); \ |
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cgroup_path(cgrp, trace_cgroup_path, \ |
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TRACE_CGROUP_PATH_LEN); \ |
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trace_cgroup_##type(cgrp, trace_cgroup_path, \ |
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##__VA_ARGS__); \ |
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spin_unlock_irqrestore(&trace_cgroup_path_lock, \ |
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flags); \ |
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} \ |
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} while (0) |
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/* |
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* The cgroup filesystem superblock creation/mount context. |
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*/ |
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struct cgroup_fs_context { |
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struct kernfs_fs_context kfc; |
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struct cgroup_root *root; |
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struct cgroup_namespace *ns; |
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unsigned int flags; /* CGRP_ROOT_* flags */ |
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/* cgroup1 bits */ |
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bool cpuset_clone_children; |
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bool none; /* User explicitly requested empty subsystem */ |
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bool all_ss; /* Seen 'all' option */ |
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u16 subsys_mask; /* Selected subsystems */ |
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char *name; /* Hierarchy name */ |
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char *release_agent; /* Path for release notifications */ |
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}; |
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static inline struct cgroup_fs_context *cgroup_fc2context(struct fs_context *fc) |
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{ |
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struct kernfs_fs_context *kfc = fc->fs_private; |
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return container_of(kfc, struct cgroup_fs_context, kfc); |
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} |
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/* |
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* A cgroup can be associated with multiple css_sets as different tasks may |
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* belong to different cgroups on different hierarchies. In the other |
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* direction, a css_set is naturally associated with multiple cgroups. |
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* This M:N relationship is represented by the following link structure |
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* which exists for each association and allows traversing the associations |
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* from both sides. |
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*/ |
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struct cgrp_cset_link { |
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/* the cgroup and css_set this link associates */ |
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struct cgroup *cgrp; |
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struct css_set *cset; |
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/* list of cgrp_cset_links anchored at cgrp->cset_links */ |
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struct list_head cset_link; |
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/* list of cgrp_cset_links anchored at css_set->cgrp_links */ |
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struct list_head cgrp_link; |
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}; |
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/* used to track tasks and csets during migration */ |
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struct cgroup_taskset { |
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/* the src and dst cset list running through cset->mg_node */ |
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struct list_head src_csets; |
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struct list_head dst_csets; |
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/* the number of tasks in the set */ |
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int nr_tasks; |
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/* the subsys currently being processed */ |
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int ssid; |
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/* |
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* Fields for cgroup_taskset_*() iteration. |
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* |
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* Before migration is committed, the target migration tasks are on |
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* ->mg_tasks of the csets on ->src_csets. After, on ->mg_tasks of |
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* the csets on ->dst_csets. ->csets point to either ->src_csets |
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* or ->dst_csets depending on whether migration is committed. |
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* |
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* ->cur_csets and ->cur_task point to the current task position |
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* during iteration. |
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*/ |
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struct list_head *csets; |
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struct css_set *cur_cset; |
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struct task_struct *cur_task; |
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}; |
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/* migration context also tracks preloading */ |
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struct cgroup_mgctx { |
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/* |
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* Preloaded source and destination csets. Used to guarantee |
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* atomic success or failure on actual migration. |
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*/ |
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struct list_head preloaded_src_csets; |
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struct list_head preloaded_dst_csets; |
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/* tasks and csets to migrate */ |
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struct cgroup_taskset tset; |
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/* subsystems affected by migration */ |
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u16 ss_mask; |
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}; |
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#define CGROUP_TASKSET_INIT(tset) \ |
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{ \ |
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.src_csets = LIST_HEAD_INIT(tset.src_csets), \ |
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.dst_csets = LIST_HEAD_INIT(tset.dst_csets), \ |
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.csets = &tset.src_csets, \ |
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} |
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#define CGROUP_MGCTX_INIT(name) \ |
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{ \ |
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LIST_HEAD_INIT(name.preloaded_src_csets), \ |
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LIST_HEAD_INIT(name.preloaded_dst_csets), \ |
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CGROUP_TASKSET_INIT(name.tset), \ |
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} |
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#define DEFINE_CGROUP_MGCTX(name) \ |
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struct cgroup_mgctx name = CGROUP_MGCTX_INIT(name) |
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extern struct mutex cgroup_mutex; |
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extern spinlock_t css_set_lock; |
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extern struct cgroup_subsys *cgroup_subsys[]; |
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extern struct list_head cgroup_roots; |
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extern struct file_system_type cgroup_fs_type; |
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/* iterate across the hierarchies */ |
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#define for_each_root(root) \ |
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list_for_each_entry((root), &cgroup_roots, root_list) |
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/** |
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* for_each_subsys - iterate all enabled cgroup subsystems |
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* @ss: the iteration cursor |
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* @ssid: the index of @ss, CGROUP_SUBSYS_COUNT after reaching the end |
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*/ |
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#define for_each_subsys(ss, ssid) \ |
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for ((ssid) = 0; (ssid) < CGROUP_SUBSYS_COUNT && \ |
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(((ss) = cgroup_subsys[ssid]) || true); (ssid)++) |
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static inline bool cgroup_is_dead(const struct cgroup *cgrp) |
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{ |
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return !(cgrp->self.flags & CSS_ONLINE); |
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} |
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static inline bool notify_on_release(const struct cgroup *cgrp) |
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{ |
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return test_bit(CGRP_NOTIFY_ON_RELEASE, &cgrp->flags); |
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} |
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void put_css_set_locked(struct css_set *cset); |
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static inline void put_css_set(struct css_set *cset) |
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{ |
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unsigned long flags; |
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/* |
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* Ensure that the refcount doesn't hit zero while any readers |
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* can see it. Similar to atomic_dec_and_lock(), but for an |
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* rwlock |
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*/ |
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if (refcount_dec_not_one(&cset->refcount)) |
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return; |
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spin_lock_irqsave(&css_set_lock, flags); |
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put_css_set_locked(cset); |
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spin_unlock_irqrestore(&css_set_lock, flags); |
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} |
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/* |
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* refcounted get/put for css_set objects |
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*/ |
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static inline void get_css_set(struct css_set *cset) |
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{ |
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refcount_inc(&cset->refcount); |
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} |
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bool cgroup_ssid_enabled(int ssid); |
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bool cgroup_on_dfl(const struct cgroup *cgrp); |
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bool cgroup_is_thread_root(struct cgroup *cgrp); |
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bool cgroup_is_threaded(struct cgroup *cgrp); |
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struct cgroup_root *cgroup_root_from_kf(struct kernfs_root *kf_root); |
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struct cgroup *task_cgroup_from_root(struct task_struct *task, |
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struct cgroup_root *root); |
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struct cgroup *cgroup_kn_lock_live(struct kernfs_node *kn, bool drain_offline); |
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void cgroup_kn_unlock(struct kernfs_node *kn); |
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int cgroup_path_ns_locked(struct cgroup *cgrp, char *buf, size_t buflen, |
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struct cgroup_namespace *ns); |
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void cgroup_free_root(struct cgroup_root *root); |
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void init_cgroup_root(struct cgroup_fs_context *ctx); |
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int cgroup_setup_root(struct cgroup_root *root, u16 ss_mask); |
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int rebind_subsystems(struct cgroup_root *dst_root, u16 ss_mask); |
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int cgroup_do_get_tree(struct fs_context *fc); |
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int cgroup_migrate_vet_dst(struct cgroup *dst_cgrp); |
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void cgroup_migrate_finish(struct cgroup_mgctx *mgctx); |
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void cgroup_migrate_add_src(struct css_set *src_cset, struct cgroup *dst_cgrp, |
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struct cgroup_mgctx *mgctx); |
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int cgroup_migrate_prepare_dst(struct cgroup_mgctx *mgctx); |
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int cgroup_migrate(struct task_struct *leader, bool threadgroup, |
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struct cgroup_mgctx *mgctx); |
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int cgroup_attach_task(struct cgroup *dst_cgrp, struct task_struct *leader, |
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bool threadgroup); |
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struct task_struct *cgroup_procs_write_start(char *buf, bool threadgroup, |
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bool *locked) |
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__acquires(&cgroup_threadgroup_rwsem); |
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void cgroup_procs_write_finish(struct task_struct *task, bool locked) |
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__releases(&cgroup_threadgroup_rwsem); |
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void cgroup_lock_and_drain_offline(struct cgroup *cgrp); |
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int cgroup_mkdir(struct kernfs_node *parent_kn, const char *name, umode_t mode); |
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int cgroup_rmdir(struct kernfs_node *kn); |
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int cgroup_show_path(struct seq_file *sf, struct kernfs_node *kf_node, |
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struct kernfs_root *kf_root); |
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int __cgroup_task_count(const struct cgroup *cgrp); |
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int cgroup_task_count(const struct cgroup *cgrp); |
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/* |
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* rstat.c |
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*/ |
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int cgroup_rstat_init(struct cgroup *cgrp); |
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void cgroup_rstat_exit(struct cgroup *cgrp); |
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void cgroup_rstat_boot(void); |
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void cgroup_base_stat_cputime_show(struct seq_file *seq); |
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/* |
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* namespace.c |
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*/ |
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extern const struct proc_ns_operations cgroupns_operations; |
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/* |
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* cgroup-v1.c |
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*/ |
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extern struct cftype cgroup1_base_files[]; |
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extern struct kernfs_syscall_ops cgroup1_kf_syscall_ops; |
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extern const struct fs_parameter_spec cgroup1_fs_parameters[]; |
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int proc_cgroupstats_show(struct seq_file *m, void *v); |
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bool cgroup1_ssid_disabled(int ssid); |
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void cgroup1_pidlist_destroy_all(struct cgroup *cgrp); |
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void cgroup1_release_agent(struct work_struct *work); |
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void cgroup1_check_for_release(struct cgroup *cgrp); |
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int cgroup1_parse_param(struct fs_context *fc, struct fs_parameter *param); |
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int cgroup1_get_tree(struct fs_context *fc); |
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int cgroup1_reconfigure(struct fs_context *ctx); |
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#endif /* __CGROUP_INTERNAL_H */
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