rem: devfs_rename(fs_cookie _fs, fs_vnode _olddir, const char *oldname, fs_vnode _newdir, const char *newname)
add: devfs_rename(fs_volume _fs, fs_vnode _olddir, const char *oldname, fs_vnode _newdir, const char *newname)
context: devfs_rename(fs_cookie _fs, fs_vnode _olddir, const char *oldname, fs_vnode _newdir, const char *newname){	return EROFS;}