linux-kernel - Re: [PATCH v2] btrfs/extent_map: Remove unneeded variable "ret"

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Date:   Thu, 23 Aug 2018 19:31:40 +0800
From:   zhong jiang <zhongjiang@...wei.com>
To:     <clm@...com>, <jbacik@...com>, <dsterba@...e.com>
CC:     <lufq.fnst@...fujitsu.com>, <suy.fnst@...fujitsu.com>,
        <linux-btrfs@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] btrfs/extent_map: Remove unneeded variable "ret"

Hi,  dsterba

Can you pick up the patch? Thanks

Best wishes,
zhong jiang
 
On 2018/8/5 21:04, zhong jiang wrote:
> The ret is not used after initalization, and we do not care about
> the return value. So make it void function.
>
> Signed-off-by: zhong jiang <zhongjiang@...wei.com>
> ---
>  fs/btrfs/extent_map.c | 10 ++--------
>  fs/btrfs/extent_map.h |  4 ++--
>  2 files changed, 4 insertions(+), 10 deletions(-)
>
> diff --git a/fs/btrfs/extent_map.c b/fs/btrfs/extent_map.c
> index 6648d55..da4e4f3 100644
> --- a/fs/btrfs/extent_map.c
> +++ b/fs/btrfs/extent_map.c
> @@ -273,10 +273,9 @@ static void try_merge_map(struct extent_map_tree *tree, struct extent_map *em)
>   * to the generation that actually added the file item to the inode so we know
>   * we need to sync this extent when we call fsync().
>   */
> -int unpin_extent_cache(struct extent_map_tree *tree, u64 start, u64 len,
> +void unpin_extent_cache(struct extent_map_tree *tree, u64 start, u64 len,
>  		       u64 gen)
>  {
> -	int ret = 0;
>  	struct extent_map *em;
>  	bool prealloc = false;
>  
> @@ -308,8 +307,6 @@ int unpin_extent_cache(struct extent_map_tree *tree, u64 start, u64 len,
>  	free_extent_map(em);
>  out:
>  	write_unlock(&tree->lock);
> -	return ret;
> -
>  }
>  
>  void clear_em_logging(struct extent_map_tree *tree, struct extent_map *em)
> @@ -428,16 +425,13 @@ struct extent_map *search_extent_mapping(struct extent_map_tree *tree,
>   * Removes @em from @tree.  No reference counts are dropped, and no checks
>   * are done to see if the range is in use
>   */
> -int remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em)
> +void remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em)
>  {
> -	int ret = 0;
> -
>  	WARN_ON(test_bit(EXTENT_FLAG_PINNED, &em->flags));
>  	rb_erase(&em->rb_node, &tree->map);
>  	if (!test_bit(EXTENT_FLAG_LOGGING, &em->flags))
>  		list_del_init(&em->list);
>  	RB_CLEAR_NODE(&em->rb_node);
> -	return ret;
>  }
>  
>  void replace_extent_mapping(struct extent_map_tree *tree,
> diff --git a/fs/btrfs/extent_map.h b/fs/btrfs/extent_map.h
> index 25d985e..c80649b 100644
> --- a/fs/btrfs/extent_map.h
> +++ b/fs/btrfs/extent_map.h
> @@ -78,7 +78,7 @@ struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree,
>  					 u64 start, u64 len);
>  int add_extent_mapping(struct extent_map_tree *tree,
>  		       struct extent_map *em, int modified);
> -int remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em);
> +void remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em);
>  void replace_extent_mapping(struct extent_map_tree *tree,
>  			    struct extent_map *cur,
>  			    struct extent_map *new,
> @@ -88,7 +88,7 @@ void replace_extent_mapping(struct extent_map_tree *tree,
>  void free_extent_map(struct extent_map *em);
>  int __init extent_map_init(void);
>  void __cold extent_map_exit(void);
> -int unpin_extent_cache(struct extent_map_tree *tree, u64 start, u64 len, u64 gen);
> +void unpin_extent_cache(struct extent_map_tree *tree, u64 start, u64 len, u64 gen);
>  void clear_em_logging(struct extent_map_tree *tree, struct extent_map *em);
>  struct extent_map *search_extent_mapping(struct extent_map_tree *tree,
>  					 u64 start, u64 len);