Function vdev_label_write_bootenv

freebsd/contrib/openzfs/module/zfs/vdev_label.c:1307–1396

}

int
vdev_label_write_bootenv(vdev_t *vd, nvlist_t *env)
{
	zio_t *zio;
	spa_t *spa = vd->vdev_spa;
	vdev_boot_envblock_t *bootenv;
	int flags = ZIO_FLAG_CONFIG_WRITER | ZIO_FLAG_CANFAIL;
	int error;
	size_t nvsize;
	char *nvbuf;

	error = nvlist_size(env, &nvsize, NV_ENCODE_XDR);
	if (error != 0)
		return (SET_ERROR(error));

	if (nvsize >= sizeof (bootenv->vbe_bootenv)) {
		return (SET_ERROR(E2BIG));
	}

	ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL);

	error = ENXIO;
	for (int c = 0; c < vd->vdev_children; c++) {
		int child_err;

		child_err = vdev_label_write_bootenv(vd->vdev_child[c], env);
		/*
		 * As long as any of the disks managed to write all of their
		 * labels successfully, return success.
		 */
		if (child_err == 0)
			error = child_err;
	}

	if (!vd->vdev_ops->vdev_op_leaf || vdev_is_dead(vd) ||
	    !vdev_writeable(vd)) {
		return (error);
	}
	ASSERT3U(sizeof (*bootenv), ==, VDEV_PAD_SIZE);
	abd_t *abd = abd_alloc_for_io(VDEV_PAD_SIZE, B_TRUE);
	abd_zero(abd, VDEV_PAD_SIZE);

	bootenv = abd_borrow_buf_copy(abd, VDEV_PAD_SIZE);
	nvbuf = bootenv->vbe_bootenv;
	nvsize = sizeof (bootenv->vbe_bootenv);

	bootenv->vbe_version = fnvlist_lookup_uint64(env, BOOTENV_VERSION);
	switch (bootenv->vbe_version) {
	case VB_RAW:
		if (nvlist_lookup_string(env, GRUB_ENVMAP, &nvbuf) == 0) {
			(void) strlcpy(bootenv->vbe_bootenv, nvbuf, nvsize);
		}
		error = 0;
		break;

	case VB_NVLIST:
		error = nvlist_pack(env, &nvbuf, &nvsize, NV_ENCODE_XDR,
		    KM_SLEEP);