cgroupfs: create /sys/fs/cgroup to mount cgroupfs on

We really shouldn't be asking userspace to create new root filesystems.
So follow along with all of the other in-kernel filesystems, and provide
a mount point in sysfs.

For cgroupfs, this should be in /sys/fs/cgroup/  This change provides
that mount point when the cgroup filesystem is registered in the kernel.

Acked-by: Paul Menage <menage@google.com>
Acked-by: Dhaval Giani <dhaval.giani@gmail.com>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: Lennart Poettering <lennart@poettering.net>
Cc: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 12 insertions, 1 deletions

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index a8ce09954404..d83cab06da87 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -1623,6 +1623,8 @@ static struct file_system_type cgroup_fs_type = {
         .kill_sb = cgroup_kill_sb,
 };
 
+static struct kobject *cgroup_kobj;
+
 static inline struct cgroup *__d_cgrp(struct dentry *dentry)
 {
         return dentry->d_fsdata;
@@ -3894,9 +3896,18 @@ int __init cgroup_init(void)
         hhead = css_set_hash(init_css_set.subsys);
         hlist_add_head(&init_css_set.hlist, hhead);
         BUG_ON(!init_root_id(&rootnode));
+
+        cgroup_kobj = kobject_create_and_add("cgroup", fs_kobj);
+        if (!cgroup_kobj) {
+                err = -ENOMEM;
+                goto out;
+        }
+
         err = register_filesystem(&cgroup_fs_type);
-        if (err < 0)
+        if (err < 0) {
+                kobject_put(cgroup_kobj);
                 goto out;
+        }
 
         proc_create("cgroups", 0, NULL, &proc_cgroupstats_operations);