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

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Date:	Mon, 13 Jan 2014 17:36:23 +0800
From:	Gu Zheng <guz.fnst@...fujitsu.com>
To:	Chao Yu <chao2.yu@...sung.com>
CC:	"'Kim'" <jaegeuk.kim@...sung.com>,
	"'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 Yu,
On 01/11/2014 09:27 AM, Chao Yu wrote:

> 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++;

Yes, you're right, thanks for your review.

Regards,
Gu

> 
>> --
>> 1.7.7
>>
>>
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> 
> 


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