298 lines
8.9 KiB
C
298 lines
8.9 KiB
C
/* 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 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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struct cgroup_pidlist;
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struct cgroup_file_ctx {
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struct cgroup_namespace *ns;
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struct {
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void *trigger;
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} psi;
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struct {
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bool started;
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struct css_task_iter iter;
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} procs;
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struct {
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struct cgroup_pidlist *pidlist;
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} procs1;
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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 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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/* iterate across the hierarchies */
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#define for_each_root(root) \
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list_for_each_entry_rcu((root), &cgroup_roots, root_list, \
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lockdep_is_held(&cgroup_mutex))
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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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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_favor_dynmods(struct cgroup_root *root, bool favor);
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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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void cgroup_attach_lock(bool lock_threadgroup);
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void cgroup_attach_unlock(bool lock_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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