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-rw-r--r--kernel/cgroup/cgroup.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c
index ea5b0f01d2b3..3a0161c21b6b 100644
--- a/kernel/cgroup/cgroup.c
+++ b/kernel/cgroup/cgroup.c
@@ -5887,6 +5887,31 @@ void cgroup_path_from_kernfs_id(u64 id, char *buf, size_t buflen)
}
/*
+ * cgroup_get_from_id : get the cgroup associated with cgroup id
+ * @id: cgroup id
+ * On success return the cgrp, on failure return NULL
+ */
+struct cgroup *cgroup_get_from_id(u64 id)
+{
+ struct kernfs_node *kn;
+ struct cgroup *cgrp = NULL;
+
+ mutex_lock(&cgroup_mutex);
+ kn = kernfs_find_and_get_node_by_id(cgrp_dfl_root.kf_root, id);
+ if (!kn)
+ goto out_unlock;
+
+ cgrp = kn->priv;
+ if (cgroup_is_dead(cgrp) || !cgroup_tryget(cgrp))
+ cgrp = NULL;
+ kernfs_put(kn);
+out_unlock:
+ mutex_unlock(&cgroup_mutex);
+ return cgrp;
+}
+EXPORT_SYMBOL_GPL(cgroup_get_from_id);
+
+/*
* proc_cgroup_show()
* - Print task's cgroup paths into seq_file, one line for each hierarchy
* - Used for /proc/<pid>/cgroup.