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

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Date:   Tue, 28 Aug 2018 19:05:31 -0700
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     Chao Yu <yuchao0@...wei.com>
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 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,
> 
> > 
> >>
> >> 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
> > 
> > .
> >