Re: [PATCH 1/3] btrfs: rst: remove encoding field from stripe_extent

[David Sterba]

On Mon, Jun 10, 2024 at 10:40:25AM +0200, Johannes Thumshirn wrote:
> -#define BTRFS_STRIPE_RAID5	5
> -#define BTRFS_STRIPE_RAID6	6
> -#define BTRFS_STRIPE_RAID1C3	7
> -#define BTRFS_STRIPE_RAID1C4	8
> -
>  struct btrfs_stripe_extent {
> -	__u8 encoding;
> -	__u8 reserved[7];
>  	/* An array of raid strides this stripe is composed of. */
> -	struct btrfs_raid_stride strides[];
> +	__DECLARE_FLEX_ARRAY(struct btrfs_raid_stride, strides);

Is there a reason to use the __ underscore macro? I see no difference
between that and DECLARE_FLEX_ARRAY and underscore usually means that
it's special in some way.