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| author |   Tejun Heo <tj@kernel.org> | 2017-08-11 05:49:01 -0700 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2017-08-11 05:49:01 -0700 |
| commit | 3e48930cc74f0c212ee1838f89ad0ca7fcf2fea1 (patch) | |
| tree | 404751a5e18ffd2e010f0ed5fda21dc3d6d2b73a /include/linux/cgroup.h | |
| parent | cgroup: short-circuit cset_cgroup_from_root() on the default hierarchy (diff) | |
| download | linux-dev-3e48930cc74f0c212ee1838f89ad0ca7fcf2fea1.tar.xz linux-dev-3e48930cc74f0c212ee1838f89ad0ca7fcf2fea1.zip | |
cgroup: misc changes
Misc trivial changes to prepare for future changes. No functional
difference.
* Expose cgroup_get(), cgroup_tryget() and cgroup_parent().
* Implement task_dfl_cgroup() which dereferences css_set->dfl_cgrp.
* Rename cgroup_stats_show() to cgroup_stat_show() for consistency
with the file name.
Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'include/linux/cgroup.h')
| -rw-r--r-- | include/linux/cgroup.h | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h index 79faa6467f76..085056e562b1 100644 --- a/include/linux/cgroup.h +++ b/include/linux/cgroup.h @@ -398,6 +398,16 @@ static inline void css_put_many(struct cgroup_subsys_state *css, unsigned int n) percpu_ref_put_many(&css->refcnt, n); } +static inline void cgroup_get(struct cgroup *cgrp) +{ + css_get(&cgrp->self); +} + +static inline bool cgroup_tryget(struct cgroup *cgrp) +{ + return css_tryget(&cgrp->self); +} + static inline void cgroup_put(struct cgroup *cgrp) { css_put(&cgrp->self); @@ -510,6 +520,20 @@ static inline struct cgroup *task_cgroup(struct task_struct *task, return task_css(task, subsys_id)->cgroup; } +static inline struct cgroup *task_dfl_cgroup(struct task_struct *task) +{ + return task_css_set(task)->dfl_cgrp; +} + +static inline struct cgroup *cgroup_parent(struct cgroup *cgrp) +{ + struct cgroup_subsys_state *parent_css = cgrp->self.parent; + + if (parent_css) + return container_of(parent_css, struct cgroup, self); + return NULL; +} + /** * cgroup_is_descendant - test ancestry * @cgrp: the cgroup to be tested |