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Date:   Wed, 29 Aug 2018 10:15:29 +0800
From:   Chao Yu <yuchao0@...wei.com>
To:     Jaegeuk Kim <jaegeuk@...nel.org>
CC:     Chao Yu <chao@...nel.org>,
        <linux-f2fs-devel@...ts.sourceforge.net>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] f2fs: fix to avoid quota inode leak in ->put_super

On 2018/8/29 10:05, Jaegeuk Kim wrote:
> On 08/21, Chao Yu wrote:
>> On 2018/8/21 10:38, Jaegeuk Kim wrote:
>>> On 08/20, Chao Yu wrote:
>>>> On 2018/8/18 23:16, Jaegeuk Kim wrote:
>>>>> On 08/17, Chao Yu wrote:
>>>>>> generic/019 reports below error:
>>>>>>
>>>>>>  __quota_error: 1160 callbacks suppressed
>>>>>>  Quota error (device zram1): write_blk: dquota write failed
>>>>>>  Quota error (device zram1): qtree_write_dquot: Error -28 occurred while creating quota
>>>>>>  Quota error (device zram1): write_blk: dquota write failed
>>>>>>  Quota error (device zram1): qtree_write_dquot: Error -28 occurred while creating quota
>>>>>>  Quota error (device zram1): write_blk: dquota write failed
>>>>>>  Quota error (device zram1): qtree_write_dquot: Error -28 occurred while creating quota
>>>>>>  Quota error (device zram1): write_blk: dquota write failed
>>>>>>  Quota error (device zram1): qtree_write_dquot: Error -28 occurred while creating quota
>>>>>>  Quota error (device zram1): write_blk: dquota write failed
>>>>>>  Quota error (device zram1): qtree_write_dquot: Error -28 occurred while creating quota
>>>>>>  VFS: Busy inodes after unmount of zram1. Self-destruct in 5 seconds.  Have a nice day...
>>>>>>
>>>>>> If we failed in below path due to fail to write dquot block, we will miss
>>>>>> to release quota inode, fix it.
>>>>>>
>>>>>> - f2fs_put_super
>>>>>>  - f2fs_quota_off_umount
>>>>>>   - f2fs_quota_off
>>>>>>    - f2fs_quota_sync   <-- failed
>>>>>>    - dquot_quota_off   <-- missed to call
>>>>>>
>>>>>> Signed-off-by: Chao Yu <yuchao0@...wei.com>
>>>>>> ---
>>>>>>  fs/f2fs/super.c | 6 ++++--
>>>>>>  1 file changed, 4 insertions(+), 2 deletions(-)
>>>>>>
>>>>>> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
>>>>>> index a5df9fbc6355..9647bbcdfd2b 100644
>>>>>> --- a/fs/f2fs/super.c
>>>>>> +++ b/fs/f2fs/super.c
>>>>>> @@ -1977,10 +1977,12 @@ void f2fs_quota_off_umount(struct super_block *sb)
>>>>>>  	for (type = 0; type < MAXQUOTAS; type++) {
>>>>>>  		err = f2fs_quota_off(sb, type);
>>>>>>  		if (err) {
>>>>>> +			int ret = dquot_quota_off(sb, type);
>>>>>> +
>>>>>
>>>>> Could you check the mainline version?
>>>>
>>>> I guess we missed to apply below patch? Could you check that?
>>>>
>>>> f2fs: report error if quota off error during umount
>>>
>>> I remember there was a bug in the patch.
>>
>> Yeah, I guess this patch can fix that one. So could you help trying to test
>> again with the two patches if you have time. :)
> 
> Let me merge two patch and try some tests again. :P

Thanks for helping. ;)

Thanks,

> 
>>
>> Thanks,
>>
>>>
>>>>
>>>> Thanks,
>>>>
>>>>>
>>>>>>  			f2fs_msg(sb, KERN_ERR,
>>>>>>  				"Fail to turn off disk quota "
>>>>>> -				"(type: %d, err: %d), Please "
>>>>>> -				"run fsck to fix it.", type, err);
>>>>>> +				"(type: %d, err: %d, ret:%d), Please "
>>>>>> +				"run fsck to fix it.", type, err, ret);
>>>>>>  			set_sbi_flag(F2FS_SB(sb), SBI_NEED_FSCK);
>>>>>>  		}
>>>>>>  	}
>>>>>> -- 
>>>>>> 2.18.0.rc1
>>>
>>> .
>>>
> 
> .
> 

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