linux-kernel - Re: [PATCH 2/2] f2fs: clean up with {attach,detach}_page

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Date:   Mon, 10 Apr 2023 11:47:11 -0700
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     Chao Yu <chao@...nel.org>
Cc:     linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] f2fs: clean up with {attach,detach}_page_private()

On 04/10, Chao Yu wrote:
> No logic changes.
> 
> Signed-off-by: Chao Yu <chao@...nel.org>
> ---
>  fs/f2fs/f2fs.h | 32 ++++++++------------------------
>  1 file changed, 8 insertions(+), 24 deletions(-)
> 
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index ec8387da7f74..c378aedcadea 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -1416,11 +1416,8 @@ static inline bool page_private_##name(struct page *page) \
>  #define PAGE_PRIVATE_SET_FUNC(name, flagname) \
>  static inline void set_page_private_##name(struct page *page) \
>  { \
> -	if (!PagePrivate(page)) { \
> -		get_page(page); \
> -		SetPagePrivate(page); \
> -		set_page_private(page, 0); \
> -	} \
> +	if (!PagePrivate(page)) \
> +		attach_page_private(page, (void *)page->private); \

		attach_page_private(page, (void *)0);

>  	set_bit(PAGE_PRIVATE_NOT_POINTER, &page_private(page)); \
>  	set_bit(PAGE_PRIVATE_##flagname, &page_private(page)); \
>  }
> @@ -1429,13 +1426,8 @@ static inline void set_page_private_##name(struct page *page) \
>  static inline void clear_page_private_##name(struct page *page) \
>  { \
>  	clear_bit(PAGE_PRIVATE_##flagname, &page_private(page)); \
> -	if (page_private(page) == BIT(PAGE_PRIVATE_NOT_POINTER)) { \
> -		set_page_private(page, 0); \
> -		if (PagePrivate(page)) { \
> -			ClearPagePrivate(page); \
> -			put_page(page); \
> -		}\
> -	} \
> +	if (page_private(page) == BIT(PAGE_PRIVATE_NOT_POINTER)) \
> +		detach_page_private(page); \
>  }
>  
>  PAGE_PRIVATE_GET_FUNC(nonpointer, NOT_POINTER);
> @@ -1464,11 +1456,8 @@ static inline unsigned long get_page_private_data(struct page *page)
>  
>  static inline void set_page_private_data(struct page *page, unsigned long data)
>  {
> -	if (!PagePrivate(page)) {
> -		get_page(page);
> -		SetPagePrivate(page);
> -		set_page_private(page, 0);
> -	}
> +	if (!PagePrivate(page))
> +		attach_page_private(page, 0);
>  	set_bit(PAGE_PRIVATE_NOT_POINTER, &page_private(page));
>  	page_private(page) |= data << PAGE_PRIVATE_MAX;
>  }
> @@ -1476,13 +1465,8 @@ static inline void set_page_private_data(struct page *page, unsigned long data)
>  static inline void clear_page_private_data(struct page *page)
>  {
>  	page_private(page) &= GENMASK(PAGE_PRIVATE_MAX - 1, 0);
> -	if (page_private(page) == BIT(PAGE_PRIVATE_NOT_POINTER)) {
> -		set_page_private(page, 0);
> -		if (PagePrivate(page)) {
> -			ClearPagePrivate(page);
> -			put_page(page);
> -		}
> -	}
> +	if (page_private(page) == BIT(PAGE_PRIVATE_NOT_POINTER))
> +		detach_page_private(page);
>  }
>  
>  /* For compression */
> -- 
> 2.25.1