linux-kernel - Re: [PATCH 1/2] f2fs: fix to avoid quota inode leak in ->put

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Date:   Mon, 20 Aug 2018 20:33:49 +0800
From:   Chao Yu <chao@...nel.org>
To:     Jaegeuk Kim <jaegeuk@...nel.org>, Chao Yu <yuchao0@...wei.com>
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 2018/8/18 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

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