linux-kernel - Re: [PATCH] btrfs: get rid of goto in alloc_test_extent

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Message-ID: <20250425113907.GC31681@suse.cz>
Date: Fri, 25 Apr 2025 13:39:07 +0200
From: David Sterba <dsterba@...e.cz>
To: Daniel Vacek <neelx@...e.com>
Cc: Chris Mason <clm@...com>, Josef Bacik <josef@...icpanda.com>,
	David Sterba <dsterba@...e.com>, linux-btrfs@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] btrfs: get rid of goto in alloc_test_extent_buffer()

On Fri, Apr 25, 2025 at 09:23:57AM +0200, Daniel Vacek wrote:
> The `free_eb` label is used only once. Simplify by moving the code inplace.
> 
> Signed-off-by: Daniel Vacek <neelx@...e.com>
> ---
>  fs/btrfs/extent_io.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
> index ea38c73d4bc5f..20cdddd924852 100644
> --- a/fs/btrfs/extent_io.c
> +++ b/fs/btrfs/extent_io.c
> @@ -3004,15 +3004,13 @@ struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info,
>  			goto again;
>  		}
>  		xa_unlock_irq(&fs_info->buffer_tree);
> -		goto free_eb;
> +		btrfs_release_extent_buffer(eb);
> +		return exists;
>  	}
>  	xa_unlock_irq(&fs_info->buffer_tree);
>  	check_buffer_tree_ref(eb);
>  
>  	return eb;
> -free_eb:
> -	btrfs_release_extent_buffer(eb);

So the xarray conversion removed the other use of the free_eb label and
calls btrfs_release_extent_buffer() + return. Doing the same here and
removing the label completely looks as an improvement, as the whole
function does direct returns instead of goto exit block.

Reviewed-by: David Sterba <dsterba@...e.com>