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

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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 <[email protected]>
Acked-by: Dhaval Giani <[email protected]>
Cc: Li Zefan <[email protected]>
Cc: Lennart Poettering <[email protected]>
Cc: Kay Sievers <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Greg KH authored and Greg Kroah-Hartman committed 2010-08-05 13:53:35 -07:00
1 parent 45daef0fdc
commit 676db4af04
1 file changed
+13 -2
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kernel/cgroup.c
+13 -2
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@@ -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));
err = register_filesystem(&cgroup_fs_type);
if (err < 0)
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) {
kobject_put(cgroup_kobj);
goto out;
}
proc_create("cgroups", 0, NULL, &proc_cgroupstats_operations);