linux-kernel - Re: [PATCH 2/2] f2fs: fix to update node page under cp

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Date:   Sat, 27 Aug 2016 16:30:30 +0800
From:   Chao Yu <yuchao0@...wei.com>
To:     Jaegeuk Kim <jaegeuk@...nel.org>, Chao Yu <chao@...nel.org>
CC:     <linux-f2fs-devel@...ts.sourceforge.net>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] f2fs: fix to update node page under cp_rwsem

On 2016/8/27 1:04, Jaegeuk Kim wrote:
> On Sat, Aug 27, 2016 at 12:14:32AM +0800, Chao Yu wrote:
>> From: Chao Yu <yuchao0@...wei.com>
>>
>> Update node page under cp_rwsem in order to keep data consistency
>> during writting checkpoint.
>>
>> Signed-off-by: Chao Yu <yuchao0@...wei.com>
>> ---
>>  fs/f2fs/inode.c | 5 ++++-
>>  1 file changed, 4 insertions(+), 1 deletion(-)
>>
>> diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c
>> index 9ac5efc..1057c73 100644
>> --- a/fs/f2fs/inode.c
>> +++ b/fs/f2fs/inode.c
>> @@ -377,8 +377,11 @@ retry:
>>  		goto retry;
>>  	}
>>  
>> -	if (err)
>> +	if (err) {
>> +		f2fs_lock_op(sbi);
>>  		update_inode_page(inode);
>> +		f2fs_unlock_op(sbi);
>> +	}
> 
> Any corner case?

No, just follow the old rule.

> Now, it allows updating node page when checkpoint is doing.

Oh, so for current rule, during checkpoint it:
1. allows updating meta info of inode which is not related to metadata of
filesystem (e.g. i_size, i_block, i_nlink..)
2. does not allow updating meta info of inode which is related to metadata of
filesystem (i_addr, i_nid..)

Is my understanding right?

Thanks,

> 
> Thanks,
> 
>>  	sb_end_intwrite(inode->i_sb);
>>  no_delete:
>>  	stat_dec_inline_xattr(inode);
>> -- 
>> 2.7.2
> 
> .
>