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cgroup: move namespace code to kernel/cgroup/namespace.c

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get/put_css_set() get exposed in cgroup-internal.h in the process.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Acked-by: Zefan Li <lizefan@huawei.com>
This commit is contained in:
Tejun Heo 2016-12-27 14:49:09 -05:00
parent d62beb7f3d
commit dcfe149b9f
4 changed files with 189 additions and 175 deletions
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32
kernel/cgroup/cgroup-internal.h
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@ -65,6 +65,33 @@ static inline bool notify_on_release(const struct cgroup *cgrp)
return test_bit(CGRP_NOTIFY_ON_RELEASE, &cgrp->flags);
}
void put_css_set_locked(struct css_set *cset);
static inline void put_css_set(struct css_set *cset)
{
unsigned long flags;
/*
* Ensure that the refcount doesn't hit zero while any readers
* can see it. Similar to atomic_dec_and_lock(), but for an
* rwlock
*/
if (atomic_add_unless(&cset->refcount, -1, 1))
return;
spin_lock_irqsave(&css_set_lock, flags);
put_css_set_locked(cset);
spin_unlock_irqrestore(&css_set_lock, flags);
}
/*
* refcounted get/put for css_set objects
*/
static inline void get_css_set(struct css_set *cset)
{
atomic_inc(&cset->refcount);
}
bool cgroup_ssid_enabled(int ssid);
bool cgroup_on_dfl(const struct cgroup *cgrp);
@ -107,6 +134,11 @@ int cgroup_rmdir(struct kernfs_node *kn);
int cgroup_show_path(struct seq_file *sf, struct kernfs_node *kf_node,
struct kernfs_root *kf_root);
/*
* namespace.c
*/
extern const struct proc_ns_operations cgroupns_operations;
/*
* cgroup-v1.c
*/