#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/security.h>


static struct dentry *root;
static struct dentry *file;


static int test_open(struct inode *inode, struct file *file)
{
    return -1;
}

static struct file_operations test_fops = {
    .owner =    THIS_MODULE,
    .open =     test_open,
};


static int __init test_init(void)
{
    root = securityfs_create_dir("test", NULL);
    if (IS_ERR(root)) {
        printk("error creating root %d\n", PTR_ERR(root));
        return PTR_ERR(root);
    }

    file = securityfs_create_file("file", S_IRUSR, root, NULL, &test_fops);
    if (IS_ERR(file)) {
        printk("error creating file %d\n", PTR_ERR(file));
        securityfs_remove(root);
        return PTR_ERR(file);
    }

    return 0;
}

static void __exit test_exit(void)
{
    securityfs_remove(file);
    securityfs_remove(root);
}

MODULE_LICENSE("GPL");

module_init(test_init);
module_exit(test_exit);