linux-kernel - Re: [f2fs-dev] [PATCH 2/3] f2fs: use __set_page_dirty

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Date:   Wed, 2 Nov 2016 15:34:32 +0800
From:   Chao Yu <yuchao0@...wei.com>
To:     Jaegeuk Kim <jaegeuk@...nel.org>, <linux-kernel@...r.kernel.org>,
        <linux-fsdevel@...r.kernel.org>,
        <linux-f2fs-devel@...ts.sourceforge.net>
Subject: Re: [f2fs-dev] [PATCH 2/3] f2fs: use __set_page_dirty_nobuffers
 directly

Hi Jaegeuk,

On 2016/10/21 10:28, Jaegeuk Kim wrote:
> This patch replaces the copied code with original generic function.

Will we plan to do further enhance inside f2fs_set_page_dirty_nobuffers, if we
don't it's better revert fe76b796fc5194cc3d57265002e3a748566d073f, as we don't
need to wrap __set_page_dirty_nobuffers.

BTW, does the original patch make memory cgroup functionality problematic?

Thanks,

> 
> Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
> ---
>  fs/f2fs/data.c | 29 -----------------------------
>  fs/f2fs/f2fs.h |  6 +++++-
>  2 files changed, 5 insertions(+), 30 deletions(-)
> 
> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> index 68edb47..3954315 100644
> --- a/fs/f2fs/data.c
> +++ b/fs/f2fs/data.c
> @@ -1801,35 +1801,6 @@ int f2fs_release_page(struct page *page, gfp_t wait)
>  	return 1;
>  }
>  
> -/*
> - * This was copied from __set_page_dirty_buffers which gives higher performance
> - * in very high speed storages. (e.g., pmem)
> - */
> -void f2fs_set_page_dirty_nobuffers(struct page *page)
> -{
> -	struct address_space *mapping = page->mapping;
> -	unsigned long flags;
> -
> -	if (unlikely(!mapping))
> -		return;
> -
> -	spin_lock(&mapping->private_lock);
> -	lock_page_memcg(page);
> -	SetPageDirty(page);
> -	spin_unlock(&mapping->private_lock);
> -
> -	spin_lock_irqsave(&mapping->tree_lock, flags);
> -	WARN_ON_ONCE(!PageUptodate(page));
> -	account_page_dirtied(page, mapping);
> -	radix_tree_tag_set(&mapping->page_tree,
> -			page_index(page), PAGECACHE_TAG_DIRTY);
> -	spin_unlock_irqrestore(&mapping->tree_lock, flags);
> -	unlock_page_memcg(page);
> -
> -	__mark_inode_dirty(mapping->host, I_DIRTY_PAGES);
> -	return;
> -}
> -
>  static int f2fs_set_data_page_dirty(struct page *page)
>  {
>  	struct address_space *mapping = page->mapping;
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index 168f939..b66a04c 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -1960,6 +1960,11 @@ static inline unsigned long f2fs_find_next_bit(const void *addr,
>  	return find_next_bit(addr, size, offset + 2);
>  }
>  
> +static inline void f2fs_set_page_dirty_nobuffers(struct page *page)
> +{
> +	__set_page_dirty_nobuffers(page);
> +}
> +
>  #define get_inode_mode(i) \
>  	((is_inode_flag_set(i, FI_ACL_MODE)) ? \
>  	 (F2FS_I(i)->i_acl_mode) : ((i)->i_mode))
> @@ -2200,7 +2205,6 @@ struct page *get_new_data_page(struct inode *, struct page *, pgoff_t, bool);
>  int do_write_data_page(struct f2fs_io_info *);
>  int f2fs_map_blocks(struct inode *, struct f2fs_map_blocks *, int, int);
>  int f2fs_fiemap(struct inode *inode, struct fiemap_extent_info *, u64, u64);
> -void f2fs_set_page_dirty_nobuffers(struct page *);
>  void f2fs_invalidate_page(struct page *, unsigned int, unsigned int);
>  int f2fs_release_page(struct page *, gfp_t);
>  #ifdef CONFIG_MIGRATION
>