BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR
args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR;
result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR;
result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR;
ret == BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR)