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Date:   Tue, 21 Aug 2018 11:35:30 +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 1/2] f2fs: fix to avoid quota inode leak in ->put_super

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. :)

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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