Quoting Aditya Kali (adityakali@xxxxxxxxxx):
> get_task_cgroup() returns the (reference counted) cgroup of the
> given task on the default hierarchy.
>
> Signed-off-by: Aditya Kali <adityakali@xxxxxxxxxx>
Acked-by: Serge E. Hallyn <serge.hallyn@xxxxxxxxxx>
> ---
> include/linux/cgroup.h | 1 +
> kernel/cgroup.c | 25 +++++++++++++++++++++++++
> 2 files changed, 26 insertions(+)
>
> diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
> index b5223c5..707c302 100644
> --- a/include/linux/cgroup.h
> +++ b/include/linux/cgroup.h
> @@ -591,6 +591,7 @@ static inline void pr_cont_cgroup_path(struct cgroup *cgrp)
> }
>
> char *task_cgroup_path(struct task_struct *task, char *buf, size_t buflen);
> +struct cgroup *get_task_cgroup(struct task_struct *task);
>
> int cgroup_add_dfl_cftypes(struct cgroup_subsys *ss, struct cftype *cfts);
> int cgroup_add_legacy_cftypes(struct cgroup_subsys *ss, struct cftype *cfts);
> diff --git a/kernel/cgroup.c b/kernel/cgroup.c
> index 1e94b71..1671345 100644
> --- a/kernel/cgroup.c
> +++ b/kernel/cgroup.c
> @@ -1937,6 +1937,31 @@ char *task_cgroup_path(struct task_struct *task, char *buf, size_t buflen)
> }
> EXPORT_SYMBOL_GPL(task_cgroup_path);
>
> +/*
> + * get_task_cgroup - returns the cgroup of the task in the default cgroup
> + * hierarchy.
> + *
> + * @task: target task
> + * This function returns the @task's cgroup on the default cgroup hierarchy. The
> + * returned cgroup has its reference incremented (by calling cgroup_get()). So
> + * the caller must cgroup_put() the obtained reference once it is done with it.
> + */
> +struct cgroup *get_task_cgroup(struct task_struct *task)
> +{
> + struct cgroup *cgrp;
> +
> + mutex_lock(&cgroup_mutex);
> + down_read(&css_set_rwsem);
> +
> + cgrp = task_cgroup_from_root(task, &cgrp_dfl_root);
> + cgroup_get(cgrp);
> +
> + up_read(&css_set_rwsem);
> + mutex_unlock(&cgroup_mutex);
> + return cgrp;
> +}
> +EXPORT_SYMBOL_GPL(get_task_cgroup);
> +
> /* used to track tasks and other necessary states during migration */
> struct cgroup_taskset {
> /* the src and dst cset list running through cset->mg_node */
> --
> 2.0.0.526.g5318336
>
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