Re: [PATCH 4/9] btrfs: scrub: factor out common scrub_stripe constraints

[Qu Wenruo <quwenruo.btrfs@gmx.com>]

On 2021/5/26 上午1:08, David Sterba wrote:
> There are common values set for the stripe constraints, some of them
> are already factored out. Do that for increment and mirror_num as well.
>
> Signed-off-by: David Sterba <dsterba@suse.com>

Reviewed-by: Qu Wenruo <wqu@suse.com>

Thanks,
Qu
> ---
>   fs/btrfs/scrub.c | 9 ++-------
>   1 file changed, 2 insertions(+), 7 deletions(-)
>
> diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
> index 518415d0c122..5839ad1e25a2 100644
> --- a/fs/btrfs/scrub.c
> +++ b/fs/btrfs/scrub.c
> @@ -3204,28 +3204,23 @@ static noinline_for_stack int scrub_stripe(struct scrub_ctx *sctx,
>   	physical = map->stripes[num].physical;
>   	offset = 0;
>   	nstripes = div64_u64(length, map->stripe_len);
> +	mirror_num = 1;
> +	increment = map->stripe_len;
>   	if (map->type & BTRFS_BLOCK_GROUP_RAID0) {
>   		offset = map->stripe_len * num;
>   		increment = map->stripe_len * map->num_stripes;
> -		mirror_num = 1;
>   	} else if (map->type & BTRFS_BLOCK_GROUP_RAID10) {
>   		int factor = map->num_stripes / map->sub_stripes;
>   		offset = map->stripe_len * (num / map->sub_stripes);
>   		increment = map->stripe_len * factor;
>   		mirror_num = num % map->sub_stripes + 1;
>   	} else if (map->type & BTRFS_BLOCK_GROUP_RAID1_MASK) {
> -		increment = map->stripe_len;
>   		mirror_num = num % map->num_stripes + 1;
>   	} else if (map->type & BTRFS_BLOCK_GROUP_DUP) {
> -		increment = map->stripe_len;
>   		mirror_num = num % map->num_stripes + 1;
>   	} else if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) {
>   		get_raid56_logic_offset(physical, num, map, &offset, NULL);
>   		increment = map->stripe_len * nr_data_stripes(map);
> -		mirror_num = 1;
> -	} else {
> -		increment = map->stripe_len;
> -		mirror_num = 1;
>   	}
>
>   	path = btrfs_alloc_path();
>