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/proc file

Hi, I'm registering a /proc file like this:

create_proc_entry(PROC_FILE_NAME, S_IRUGO | S_IWUGO)

I expect I could write this file, I also register the file 
inode_operations with a permission pointer containing this:

my_proc_permission (struct inode * inodep, int op){
    if (op == 4 || (op == 2 && current->euid == 00))
        return 0;
    return -EACCES;
}

when I call:

open("/proc/my_proc", I_RDWR);

I get a Permission Denied error.

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