cgroup: make css_tryget_online_from_dir() also recognize cgroup2 fs
The function currently returns -EBADF for a directory on the default
hierarchy. Make it also recognize cgroup2_fs_type. This will be used
for perf_event cgroup2 support.
Signed-off-by: Tejun Heo <tj@kernel.org>
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index afbed52..2b11436 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -5781,12 +5781,13 @@
struct cgroup_subsys *ss)
{
struct kernfs_node *kn = kernfs_node_from_dentry(dentry);
+ struct file_system_type *s_type = dentry->d_sb->s_type;
struct cgroup_subsys_state *css = NULL;
struct cgroup *cgrp;
/* is @dentry a cgroup dir? */
- if (dentry->d_sb->s_type != &cgroup_fs_type || !kn ||
- kernfs_type(kn) != KERNFS_DIR)
+ if ((s_type != &cgroup_fs_type && s_type != &cgroup2_fs_type) ||
+ !kn || kernfs_type(kn) != KERNFS_DIR)
return ERR_PTR(-EBADF);
rcu_read_lock();