linux-kernel - RE: [f2fs-dev] [PATCH 1/3] f2fs: move grabing orphan pages out of protection region

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Date:	Sat, 11 Jan 2014 09:27:55 +0800
From:	Chao Yu <chao2.yu@...sung.com>
To:	'Gu Zheng' <guz.fnst@...fujitsu.com>,
	'Kim' <jaegeuk.kim@...sung.com>
Cc:	'fsdevel' <linux-fsdevel@...r.kernel.org>,
	'linux-kernel' <linux-kernel@...r.kernel.org>,
	'f2fs' <linux-f2fs-devel@...ts.sourceforge.net>
Subject: RE: [f2fs-dev] [PATCH 1/3] f2fs: move grabing orphan pages out of
 protection region

Hi Gu,

> -----Original Message-----
> From: Gu Zheng [mailto:guz.fnst@...fujitsu.com]
> Sent: Friday, January 10, 2014 6:09 PM
> To: Kim
> Cc: fsdevel; linux-kernel; f2fs
> Subject: [f2fs-dev] [PATCH 1/3] f2fs: move grabing orphan pages out of protection region
> 
> Move grabing orphan block page out of protection region, and grab all
> the orphan block pages ahead.
> 
> Signed-off-by: Gu Zheng <guz.fnst@...fujitsu.com>

Reviewed-by: Chao Yu <chao2.yu@...sung.com>

> ---
>  fs/f2fs/checkpoint.c |   15 +++++++++------
>  1 files changed, 9 insertions(+), 6 deletions(-)
> 
> diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
> index 0d78bbe..af92c74 100644
> --- a/fs/f2fs/checkpoint.c
> +++ b/fs/f2fs/checkpoint.c
> @@ -303,22 +303,25 @@ static void write_orphan_inodes(struct f2fs_sb_info *sbi, block_t
> start_blk)
>  {
>  	struct list_head *head;
>  	struct f2fs_orphan_block *orphan_blk = NULL;
> -	struct page *page = NULL;
>  	unsigned int nentries = 0;
> -	unsigned short index = 1;
> -	unsigned short orphan_blocks;
> +	unsigned short index;
> +	unsigned short orphan_blocks = (unsigned short)((sbi->n_orphans +
> +		(F2FS_ORPHANS_PER_BLOCK - 1)) / F2FS_ORPHANS_PER_BLOCK);
> +	struct page *page = NULL;
> +	struct page *pages[orphan_blocks];
>  	struct orphan_inode_entry *orphan = NULL;
> 
> -	orphan_blocks = (unsigned short)((sbi->n_orphans +
> -		(F2FS_ORPHANS_PER_BLOCK - 1)) / F2FS_ORPHANS_PER_BLOCK);
> +	for (index = 0; index < orphan_blocks; index++)
> +		pages[index] = grab_meta_page(sbi, start_blk + index);
> 
> +	index = 1;
>  	mutex_lock(&sbi->orphan_inode_mutex);
>  	head = &sbi->orphan_inode_list;
> 
>  	/* loop for each orphan inode entry and write them in Jornal block */
>  	list_for_each_entry(orphan, head, list) {
>  		if (!page) {
> -			page = grab_meta_page(sbi, start_blk);
> +			page = pages[index - 1];
>  			orphan_blk =
>  				(struct f2fs_orphan_block *)page_address(page);
>  			memset(orphan_blk, 0, sizeof(*orphan_blk));

It seems that we could remove the following code in write_orphan_inodes.
			start_blk++;

> --
> 1.7.7
> 
> 
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