rem: rootfs_write_stat(fs_cookie _fs, fs_vnode _v, const struct stat *stat, int stat_mask)
add: rootfs_write_stat(fs_volume _fs, fs_vnode _v, const struct stat *stat, int stat_mask)
context: rootfs_write_stat(fs_cookie _fs, fs_vnode _v, const struct stat *stat, int stat_mask){#if ROOTFS_TRACE	struct rootfs *fs = _fs;	struct rootfs_vnode *v = _v;	TRACE(("rootfs_wstat: vnode %p (0x%Lx), stat %p\n", v, v->id, stat));#endif	// cannot change anything	return EINVAL;}