ZFS_IOC_SEND_SPACE
{ (uint_t)ZFS_IOC_SEND_SPACE, "ZFS_IOC_SEND_SPACE",
err = lzc_ioctl(ZFS_IOC_SEND_SPACE, snapname, args, &result);
IOC_INPUT_TEST(ZFS_IOC_SEND_SPACE, snapshot2, NULL, optional, 0);
CHECK(ZFS_IOC_BASE + 65 == ZFS_IOC_SEND_SPACE);
zfs_ioctl_register("send_space", ZFS_IOC_SEND_SPACE,