linux-kernel - Re: [PATCH] btrfs: turn btrfs_destroy_delayed

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Date:   Tue, 9 Mar 2021 17:50:04 +0800
From:   Anand Jain <anand.jain@...cle.com>
To:     Yang Li <yang.lee@...ux.alibaba.com>, clm@...com
Cc:     josef@...icpanda.com, dsterba@...e.com,
        linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] btrfs: turn btrfs_destroy_delayed_refs() into void
 function

On 9/3/21 5:32 pm, Yang Li wrote:
> This function always return '0' and no callers use the return value.
> So make it a void function.
> 
> This eliminates the following coccicheck warning:
> ./fs/btrfs/disk-io.c:4522:5-8: Unneeded variable: "ret". Return "0" on
> line 4530
> 
> Reported-by: Abaci Robot <abaci@...ux.alibaba.com>
> Signed-off-by: Yang Li <yang.lee@...ux.alibaba.com>

Reviewed-by: Anand Jain <anand.jain@...cle.com>

> ---
>   fs/btrfs/disk-io.c | 7 ++-----
>   1 file changed, 2 insertions(+), 5 deletions(-)
> 
> diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
> index 41b718c..b75d2d9 100644
> --- a/fs/btrfs/disk-io.c
> +++ b/fs/btrfs/disk-io.c
> @@ -52,7 +52,7 @@
>   
>   static void end_workqueue_fn(struct btrfs_work *work);
>   static void btrfs_destroy_ordered_extents(struct btrfs_root *root);
> -static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
> +static void btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
>   				      struct btrfs_fs_info *fs_info);

  A nit...
  The declare here can be removed without moving the code.

Thanks, Anand

>   static void btrfs_destroy_delalloc_inodes(struct btrfs_root *root);
>   static int btrfs_destroy_marked_extents(struct btrfs_fs_info *fs_info,
> @@ -4513,13 +4513,12 @@ static void btrfs_destroy_all_ordered_extents(struct btrfs_fs_info *fs_info)
>   	btrfs_wait_ordered_roots(fs_info, U64_MAX, 0, (u64)-1);
>   }
>   
> -static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
> +static void btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
>   				      struct btrfs_fs_info *fs_info)
>   {
>   	struct rb_node *node;
>   	struct btrfs_delayed_ref_root *delayed_refs;
>   	struct btrfs_delayed_ref_node *ref;
> -	int ret = 0;
>   
>   	delayed_refs = &trans->delayed_refs;
>   
> @@ -4592,8 +4591,6 @@ static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
>   	btrfs_qgroup_destroy_extent_records(trans);
>   
>   	spin_unlock(&delayed_refs->lock);
> -
> -	return ret;
>   }
>   
>   static void btrfs_destroy_delalloc_inodes(struct btrfs_root *root)
>