linux-kernel - RE: [f2fs-dev] [PATCH 3/3] f2fs: introduce f2fs_cache_node_page() to add page into node

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Date:	Thu, 05 Dec 2013 10:10:59 +0800
From:	Chao Yu <chao2.yu@...sung.com>
To:	'???' <jaegeuk.kim@...sung.com>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-f2fs-devel@...ts.sourceforge.net,
	谭姝 <shu.tan@...sung.com>
Subject: RE: [f2fs-dev] [PATCH 3/3] f2fs: introduce f2fs_cache_node_page() to
 add page into node_inode cache

> -----Original Message-----
> From: Chao Yu [mailto:chao2.yu@...sung.com]
> Sent: Thursday, December 05, 2013 9:55 AM
> To: ???
> Cc: linux-fsdevel@...r.kernel.org; linux-kernel@...r.kernel.org; linux-f2fs-devel@...ts.sourceforge.net
> Subject: [f2fs-dev] [PATCH 3/3] f2fs: introduce f2fs_cache_node_page() to add page into node_inode cache
> 
> This patch introduces f2fs_cache_node_page(), in this function, page which is
> readed ahead will be copy to node_inode's mapping cache.
> It will avoid rereading these node pages.
> 
> Signed-off-by: Chao Yu <chao2.yu@...sung.com>

Suggested-by: Jaegeuk Kim <jaegeuk.kim@...sung.com>

I miss that, my mistake.

> ---
>  fs/f2fs/node.c |   30 ++++++++++++++++++++++++++++++
>  1 file changed, 30 insertions(+)
> 
> diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
> index 099f06f..5e2588f 100644
> --- a/fs/f2fs/node.c
> +++ b/fs/f2fs/node.c
> @@ -1600,6 +1600,34 @@ static int ra_sum_pages(struct f2fs_sb_info *sbi, struct list_head *pages,
>  	return 0;
>  }
> 
> +/*
> + * f2fs_cache_node_page() copy updated page data to node_inode cache page.
> + */
> +void f2fs_cache_node_page(struct f2fs_sb_info *sbi, struct page *page,
> +						nid_t nid)
> +{
> +	struct address_space *mapping = sbi->node_inode->i_mapping;
> +	struct page *npage;
> +
> +	npage = find_get_page(mapping, nid);
> +	if (npage && PageUptodate(npage)) {
> +		f2fs_put_page(npage, 0);
> +		return;
> +	}
> +	f2fs_put_page(npage, 0);
> +
> +	npage = grab_cache_page(mapping, nid);
> +	if (!npage)
> +		return;
> +
> +	memcpy(page_address(npage), page_address(page), PAGE_CACHE_SIZE);
> +
> +	SetPageUptodate(npage);
> +	f2fs_put_page(npage, 1);
> +
> +	return;
> +}
> +
>  int restore_node_summary(struct f2fs_sb_info *sbi,
>  			unsigned int segno, struct f2fs_summary_block *sum)
>  {
> @@ -1633,6 +1661,8 @@ int restore_node_summary(struct f2fs_sb_info *sbi,
>  				sum_entry->version = 0;
>  				sum_entry->ofs_in_node = 0;
>  				sum_entry++;
> +				f2fs_cache_node_page(sbi, page,
> +					le32_to_cpu(rn->footer.nid));
>  			} else {
>  				err = -EIO;
>  			}
> --
> 1.7.9.5
> 
> 
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