linux.conf.au 2003
Create struct file_system_type


2.5 kernel
        static struct file_system_type pcihpfs_type = {
                .owner =        THIS_MODULE,
                .name =         "pcihpfs",
                .get_sb =       pcihpfs_get_sb,
                .kill_sb =      kill_litter_super, 
        };      

2.2 and 2.4 kernel
        static DECLARE_FSTYPE(pcihpfs_type,
                                 "pcihpfs",
                                 pcihpfs_read_super,
                                 FS_SINGLE | FS_LITTER);