From f17fc25f2b4f4bd8edafe36af6d7379eb9db27a0 Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Tue, 23 Feb 2016 10:00:51 -0500 Subject: [PATCH] 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 --- kernel/cgroup.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/kernel/cgroup.c b/kernel/cgroup.c index afbed523b22f..2b114368666c 100644 --- a/kernel/cgroup.c +++ b/kernel/cgroup.c @@ -5781,12 +5781,13 @@ struct cgroup_subsys_state *css_tryget_online_from_dir(struct dentry *dentry, 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();