linux-kernel - Re: [f2fs-dev] [PATCH 5/5] f2fs: enforce fsync

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Message-ID: <9e18815d-1ad0-51ae-512b-b5751dfe2e07@huawei.com>
Date:   Fri, 27 Apr 2018 09:41:18 +0800
From:   Chao Yu <yuchao0@...wei.com>
To:     Jaegeuk Kim <jaegeuk@...nel.org>, Chao Yu <chao@...nel.org>
CC:     <linux-kernel@...r.kernel.org>,
        <linux-f2fs-devel@...ts.sourceforge.net>
Subject: Re: [f2fs-dev] [PATCH 5/5] f2fs: enforce fsync_mode=strict for
 renamed directory

On 2018/4/26 23:32, Jaegeuk Kim wrote:
> On 04/25, Chao Yu wrote:
>> On 2018/4/25 13:46, Jaegeuk Kim wrote:
>>> This is to give a option for user to be able to recover B/foo in the below
>>> case.
>>>
>>> mkdir A
>>> sync()
>>> rename(A, B)
>>> creat (B/foo)
>>> fsync (B/foo)
>>> ---crash---
>>
>> That makes sense, IMO, it will be better to cover cross rename case as well?
> 
> file_lost_pino(old_inode) seems covering that.

Confirmed.

Thanks,

> 
>>
>> Thanks,
>>
>>>
>>> Sugessted-by: Velayudhan Pillai <vijay@...utexas.edu>
>>> Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
>>> ---
>>>  fs/f2fs/namei.c | 5 ++++-
>>>  1 file changed, 4 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
>>> index b5f404674cad..fef6e3ab2135 100644
>>> --- a/fs/f2fs/namei.c
>>> +++ b/fs/f2fs/namei.c
>>> @@ -973,8 +973,11 @@ static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
>>>  			f2fs_put_page(old_dir_page, 0);
>>>  		f2fs_i_links_write(old_dir, false);
>>>  	}
>>> -	if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT)
>>> +	if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
>>>  		add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
>>> +		if (S_ISDIR(old_inode->i_mode))
>>> +			add_ino_entry(sbi, old_inode->i_ino, TRANS_DIR_INO);
>>> +	}
>>>  
>>>  	f2fs_unlock_op(sbi);
>>>  
>>>
> 
> .
>