Re: [PATCH] btrfs: make unpin_extent_cache return void

[Qu Wenruo]

On 2023/6/14 15:29, baomingtong001@xxxxxxxxxx wrote:
> The return value of unpin_extent_cache is always 0,
> and its caller does not check its return value.
>
> Signed-off-by: Mingtong Bao <baomingtong001@xxxxxxxxxx>

Reviewed-by: Qu Wenruo <wqu@xxxxxxxx>

Thanks,
Qu
> ---
>   fs/btrfs/extent_map.c | 3 +--
>   fs/btrfs/extent_map.h | 2 +-
>   2 files changed, 2 insertions(+), 3 deletions(-)
>
> diff --git a/fs/btrfs/extent_map.c b/fs/btrfs/extent_map.c
> index f3e9aaeb9956..845994b47998 100644
> --- a/fs/btrfs/extent_map.c
> +++ b/fs/btrfs/extent_map.c
> @@ -292,7 +292,7 @@ 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)
>   {
>       struct extent_map *em;
> @@ -326,7 +326,6 @@ int unpin_extent_cache(struct extent_map_tree *tree,
> u64 start, u64 len,
>       free_extent_map(em);
>   out:
>       write_unlock(&tree->lock);
> -    return 0;
>
>   }
>
> diff --git a/fs/btrfs/extent_map.h b/fs/btrfs/extent_map.h
> index 35d27c756e08..486a8ea798c7 100644
> --- a/fs/btrfs/extent_map.h
> +++ b/fs/btrfs/extent_map.h
> @@ -97,7 +97,7 @@ struct extent_map *alloc_extent_map(void);
>   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);