linux-kernel - Re: [PATCH] btrfs: remove redundant stop_loop variable in scrub

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Message-ID: <CAL3q7H7AG9+mAXv7Fk6td8KdAWfqK51MzXAMZHT0TnHSsbjHwA@mail.gmail.com>
Date: Thu, 26 Sep 2024 10:50:28 +0100
From: Filipe Manana <fdmanana@...nel.org>
To: Riyan Dhiman <riyandhiman14@...il.com>
Cc: clm@...com, josef@...icpanda.com, dsterba@...e.com, 
	linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] btrfs: remove redundant stop_loop variable in scrub_stripe()

On Thu, Sep 26, 2024 at 8:51 AM Riyan Dhiman <riyandhiman14@...il.com> wrote:
>
> The variable stop_loop was originally introduced in commit
> 625f1c8dc66d7 (Btrfs: improve the loop of scrub_stripe). It was initialized
> to 0 in commit 3b080b2564287 (Btrfs: scrub raid56 stripes in the right way).
> However, in a later commit 18d30ab961497 (btrfs: scrub: use scrub_simple_mirror()
> to handle RAID56 data stripe scrub), the code that modified stop_loop was removed,
> making the variable redundant.
>
> Currently, stop_loop is only initialized with 0 and is never used or modified
> within the scrub_stripe() function. As a result, this patch removes the
> stop_loop variable to clean up the code and eliminate unnecessary redundancy.
>
> This change has no impact on functionality, as stop_loop was never utilized
> in any meaningful way in the final version of the code.
>
> Signed-off-by: Riyan Dhiman <riyandhiman14@...il.com>

Reviewed-by: Filipe Manana <fdmanana@...e.com>

Looks good, thanks.

> ---
> Compile tested only
>
>  fs/btrfs/scrub.c | 9 +--------
>  1 file changed, 1 insertion(+), 8 deletions(-)
>
> diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
> index 3a3427428074..43431065d981 100644
> --- a/fs/btrfs/scrub.c
> +++ b/fs/btrfs/scrub.c
> @@ -2256,7 +2256,6 @@ static noinline_for_stack int scrub_stripe(struct scrub_ctx *sctx,
>         /* Offset inside the chunk */
>         u64 offset;
>         u64 stripe_logical;
> -       int stop_loop = 0;
>
>         /* Extent_path should be released by now. */
>         ASSERT(sctx->extent_path.nodes[0] == NULL);
> @@ -2370,14 +2369,8 @@ static noinline_for_stack int scrub_stripe(struct scrub_ctx *sctx,
>                 logical += increment;
>                 physical += BTRFS_STRIPE_LEN;
>                 spin_lock(&sctx->stat_lock);
> -               if (stop_loop)
> -                       sctx->stat.last_physical =
> -                               map->stripes[stripe_index].physical + dev_stripe_len;
> -               else
> -                       sctx->stat.last_physical = physical;
> +               sctx->stat.last_physical = physical;
>                 spin_unlock(&sctx->stat_lock);
> -               if (stop_loop)
> -                       break;
>         }
>  out:
>         ret2 = flush_scrub_stripes(sctx);
> --
> 2.46.1
>
>