rem: devfs_write_stat(fs_cookie _fs, fs_vnode _v, const struct stat *stat, int stat_mask)
add: devfs_write_stat(fs_volume _fs, fs_vnode _v, const struct stat *stat, int stat_mask)
context: devfs_write_stat(fs_cookie _fs, fs_vnode _v, const struct stat *stat, int stat_mask){#if DEVFS_TRACE	struct devfs_vnode *v = _v;	TRACE(("devfs_wstat: vnode %p (%Ld), stat %p\n", v, v->id, stat));#endif	// cannot change anything	return EPERM;}