From 0a268dbd7932c78896f5a45c8a492b31729db6c0 Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Tue, 27 Dec 2016 14:49:06 -0500 Subject: cgroup: move cgroup v1 specific code to kernel/cgroup/cgroup-v1.c cgroup.c is getting too unwieldy. Let's move out cgroup v1 specific code along with the debug controller into kernel/cgroup/cgroup-v1.c. v2: cgroup_mutex and css_set_lock made available in cgroup-internal.h regardless of CONFIG_PROVE_RCU. Signed-off-by: Tejun Heo Acked-by: Acked-by: Zefan Li --- kernel/cgroup/cgroup-internal.h | 103 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 103 insertions(+) create mode 100644 kernel/cgroup/cgroup-internal.h (limited to 'kernel/cgroup/cgroup-internal.h') diff --git a/kernel/cgroup/cgroup-internal.h b/kernel/cgroup/cgroup-internal.h new file mode 100644 index 000000000000..dca3193bd9d2 --- /dev/null +++ b/kernel/cgroup/cgroup-internal.h @@ -0,0 +1,103 @@ +#ifndef __CGROUP_INTERNAL_H +#define __CGROUP_INTERNAL_H + +#include +#include +#include +#include + +/* + * A cgroup can be associated with multiple css_sets as different tasks may + * belong to different cgroups on different hierarchies. In the other + * direction, a css_set is naturally associated with multiple cgroups. + * This M:N relationship is represented by the following link structure + * which exists for each association and allows traversing the associations + * from both sides. + */ +struct cgrp_cset_link { + /* the cgroup and css_set this link associates */ + struct cgroup *cgrp; + struct css_set *cset; + + /* list of cgrp_cset_links anchored at cgrp->cset_links */ + struct list_head cset_link; + + /* list of cgrp_cset_links anchored at css_set->cgrp_links */ + struct list_head cgrp_link; +}; + +extern struct mutex cgroup_mutex; +extern spinlock_t css_set_lock; +extern struct cgroup_subsys *cgroup_subsys[]; +extern struct list_head cgroup_roots; +extern struct file_system_type cgroup_fs_type; + +/* iterate across the hierarchies */ +#define for_each_root(root) \ + list_for_each_entry((root), &cgroup_roots, root_list) + +/** + * for_each_subsys - iterate all enabled cgroup subsystems + * @ss: the iteration cursor + * @ssid: the index of @ss, CGROUP_SUBSYS_COUNT after reaching the end + */ +#define for_each_subsys(ss, ssid) \ + for ((ssid) = 0; (ssid) < CGROUP_SUBSYS_COUNT && \ + (((ss) = cgroup_subsys[ssid]) || true); (ssid)++) + +static inline bool cgroup_is_dead(const struct cgroup *cgrp) +{ + return !(cgrp->self.flags & CSS_ONLINE); +} + +static inline bool notify_on_release(const struct cgroup *cgrp) +{ + return test_bit(CGRP_NOTIFY_ON_RELEASE, &cgrp->flags); +} + +bool cgroup_ssid_enabled(int ssid); +bool cgroup_on_dfl(const struct cgroup *cgrp); + +struct cgroup_root *cgroup_root_from_kf(struct kernfs_root *kf_root); +struct cgroup *task_cgroup_from_root(struct task_struct *task, + struct cgroup_root *root); +struct cgroup *cgroup_kn_lock_live(struct kernfs_node *kn, bool drain_offline); +void cgroup_kn_unlock(struct kernfs_node *kn); +int cgroup_path_ns_locked(struct cgroup *cgrp, char *buf, size_t buflen, + struct cgroup_namespace *ns); + +int rebind_subsystems(struct cgroup_root *dst_root, u16 ss_mask); + +bool cgroup_may_migrate_to(struct cgroup *dst_cgrp); +void cgroup_migrate_finish(struct list_head *preloaded_csets); +void cgroup_migrate_add_src(struct css_set *src_cset, + struct cgroup *dst_cgrp, + struct list_head *preloaded_csets); +int cgroup_migrate_prepare_dst(struct list_head *preloaded_csets); +int cgroup_migrate(struct task_struct *leader, bool threadgroup, + struct cgroup_root *root); + +int cgroup_attach_task(struct cgroup *dst_cgrp, struct task_struct *leader, + bool threadgroup); +ssize_t __cgroup_procs_write(struct kernfs_open_file *of, char *buf, + size_t nbytes, loff_t off, bool threadgroup); +ssize_t cgroup_procs_write(struct kernfs_open_file *of, char *buf, size_t nbytes, + loff_t off); + +void cgroup_lock_and_drain_offline(struct cgroup *cgrp); + +/* + * cgroup-v1.c + */ +extern spinlock_t release_agent_path_lock; +extern struct cftype cgroup_legacy_base_files[]; +extern const struct file_operations proc_cgroupstats_operations; + +bool cgroup_ssid_no_v1(int ssid); +void cgroup_pidlist_destroy_all(struct cgroup *cgrp); +int cgroup_rename(struct kernfs_node *kn, struct kernfs_node *new_parent, + const char *new_name_str); +void cgroup_release_agent(struct work_struct *work); +void check_for_release(struct cgroup *cgrp); + +#endif /* __CGROUP_INTERNAL_H */ -- cgit