[PATCH net-next v5 1/3] cgroup: Add task_under_cgroup_hierarchy cgroup inline function to headers
From: Sargun Dhillon <hidden>
Date: 2016-08-12 15:56:43
Subsystem:
control group (cgroup), the rest · Maintainers:
Tejun Heo, Johannes Weiner, Michal Koutný, Linus Torvalds
This commit adds an inline function to cgroup.h to check whether a given task is under a given cgroup hierarchy. This is to avoid having to put ifdefs in .c files to gate access to cgroups. When cgroups are disabled this always returns true. Signed-off-by: Sargun Dhillon <redacted> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Daniel Borkmann <daniel@iogearbox.net> Cc: Tejun Heo <tj@kernel.org> Acked-by: Tejun Heo <tj@kernel.org> --- include/linux/cgroup.h | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+)
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 984f73b..a4414a1 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h@@ -497,6 +497,23 @@ static inline bool cgroup_is_descendant(struct cgroup *cgrp, return cgrp->ancestor_ids[ancestor->level] == ancestor->id; } +/** + * task_under_cgroup_hierarchy - test task's membership of cgroup ancestry + * @task: the task to be tested + * @ancestor: possible ancestor of @task's cgroup + * + * Tests whether @task's default cgroup hierarchy is a descendant of @ancestor. + * It follows all the same rules as cgroup_is_descendant, and only applies + * to the default hierarchy. + */ +static inline bool task_under_cgroup_hierarchy(struct task_struct *task, + struct cgroup *ancestor) +{ + struct css_set *cset = task_css_set(task); + + return cgroup_is_descendant(cset->dfl_cgrp, ancestor); +} + /* no synchronization, the result can only be used as a hint */ static inline bool cgroup_is_populated(struct cgroup *cgrp) {
@@ -557,6 +574,7 @@ static inline void pr_cont_cgroup_path(struct cgroup *cgrp) #else /* !CONFIG_CGROUPS */ struct cgroup_subsys_state; +struct cgroup; static inline void css_put(struct cgroup_subsys_state *css) {} static inline int cgroup_attach_task_all(struct task_struct *from,
@@ -574,6 +592,11 @@ static inline void cgroup_free(struct task_struct *p) {} static inline int cgroup_init_early(void) { return 0; } static inline int cgroup_init(void) { return 0; } +static inline bool task_under_cgroup_hierarchy(struct task_struct *task, + struct cgroup *ancestor) +{ + return true; +} #endif /* !CONFIG_CGROUPS */ /*
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2.7.4