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Date:   Thu, 18 Oct 2018 12:04:01 -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, Weichao Guo <guoweichao@...wei.com>
Subject: Re: [PATCH v11] f2fs: guarantee journalled quota data by checkpoint

On 10/17, Chao Yu wrote:
> Jaegeuk,
> 
> Sorry for the long delay, I'm busy on other thing.
> 
> I'm trying your fixing code on both fsck and kernel with 'run.sh
> por_fsstress' case.
> 
> And got below output, is that normal in updated fsck? I didn't have time to
> look into this.

Yeah, I just stopped to allocate new blocks to fix quota, if there may have
some data to be reocvered at the next mount time.

> 
> Info: checkpoint state = 8c6 :  quota_need_fsck nat_bits crc
> compacted_summary orphan_inodes sudden-power-off
> [fsck_chk_quota_files:1755] Fixing Quota file ([  0] ino [0x4])
> [ERROR] quotaio_tree.c:83:write_blk:: Cannot write block (1320):
> Inappropriate ioctl for device
> [ERROR] quotaio_tree.c:110:get_free_dqblk:: Cannot allocate new quota block
> (out of disk space).
> [ERROR] quotaio_tree.c:315:dq_insert_tree:: Cannot write quota (id
> 67368348): Inappropriate ioctl for device
> [fsck_chk_quota_files:1755] Fixing Quota file ([  1] ino [0x5])
> [ERROR] quotaio_tree.c:83:write_blk:: Cannot write block (1332):
> Inappropriate ioctl for device
> [ERROR] quotaio_tree.c:110:get_free_dqblk:: Cannot allocate new quota block
> (out of disk space).
> [ERROR] quotaio_tree.c:315:dq_insert_tree:: Cannot write quota (id
> 73435216): Inappropriate ioctl for device
> 
> Thanks,
> 
> 
> On 2018/10/3 0:45, Jaegeuk Kim wrote:
> > On 10/01, Chao Yu wrote:
> >> On 2018-10-1 9:49, Jaegeuk Kim wrote:
> >>> On 10/01, Chao Yu wrote:
> >>>> On 2018-10-1 9:29, Jaegeuk Kim wrote:
> >>>>> On 10/01, Chao Yu wrote:
> >>>>>> Hi Jaegeuk,
> >>>>>>
> >>>>>> On 2018-10-1 8:06, Jaegeuk Kim wrote:
> >>>>>>> Hi Chao,
> >>>>>>>
> >>>>>>> This fails on fsstress with godown without fault injection. Could you please
> >>>>>>> test a bit? I assumed that this patch should give no fsck failure along with
> >>>>>>> valid checkpoint having no flag.
> >>>>>>
> >>>>>> Okay, let me reproduce with that case.
> >>>>>>
> >>>>>>>
> >>>>>>> BTW, I'm in doubt that f2fs_lock_all covers entire quota modification. What
> >>>>>>> about prepare_write_begin() -> f2fs_get_block() ... -> inc_valid_block_count()?
> >>>>>>
> >>>>>> If quota data changed in above path, we will detect that in below condition:
> >>>>>>
> >>>>>> block_operation()
> >>>>>>
> >>>>>> 	down_write(&sbi->node_change);
> >>>>>>
> >>>>>> 	if (__need_flush_quota(sbi)) {
> >>>>>> 		up_write(&sbi->node_change);
> >>>>>> 		f2fs_unlock_all(sbi);
> >>>>>> 		goto retry_flush_quotas;
> >>>>>> 	}
> >>>>>>
> >>>>>> So there is no problem?
> >>>>>
> >>>>> We may need to check quota is dirty, since we have no way to detect by
> >>>>> f2fs structures?
> >>>>
> >>>> Below condition can check that.
> >>>>
> >>>> static bool __need_flush_quota(struct f2fs_sb_info *sbi)
> >>>> {
> >>>> ...
> >>>> 	if (is_sbi_flag_set(sbi, SBI_QUOTA_NEED_FLUSH))
> >>>> 		return true;
> >>>> 	if (get_pages(sbi, F2FS_DIRTY_QDATA))
> >>>> 		return true;
> >>>> ...
> >>>> }
> >>>>
> >>>> static int f2fs_dquot_mark_dquot_dirty(struct dquot *dquot)
> >>>> {
> >>>> ...
> >>>> 	ret = dquot_mark_dquot_dirty(dquot);
> >>>>
> >>>> 	/* if we are using journalled quota */
> >>>> 	if (is_journalled_quota(sbi))
> >>>> 		set_sbi_flag(sbi, SBI_QUOTA_NEED_FLUSH);
> >>>> ...
> >>>> }
> >>>
> >>> Okay, then, could you please run the above stress test to reproduce this?
> >>
> >> Sure, let me try this case and fix it.
> >>
> >> Could you check other patches in mailing list, and test them instead?
> > 
> > With the below change, the test result is much better for now.
> > Let me know, if you have further concern.
> > 
> > ---
> >  fs/f2fs/checkpoint.c | 6 ++++++
> >  fs/f2fs/super.c      | 4 +++-
> >  2 files changed, 9 insertions(+), 1 deletion(-)
> > 
> > diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
> > index a1facfbfc5c7..b111c6201023 100644
> > --- a/fs/f2fs/checkpoint.c
> > +++ b/fs/f2fs/checkpoint.c
> > @@ -1111,6 +1111,8 @@ static int block_operations(struct f2fs_sb_info *sbi)
> >  
> >  retry_flush_quotas:
> >  	if (__need_flush_quota(sbi)) {
> > +		int locked;
> > +
> >  		if (++cnt > DEFAULT_RETRY_QUOTA_FLUSH_COUNT) {
> >  			set_sbi_flag(sbi, SBI_QUOTA_SKIP_FLUSH);
> >  			f2fs_lock_all(sbi);
> > @@ -1118,7 +1120,11 @@ static int block_operations(struct f2fs_sb_info *sbi)
> >  		}
> >  		clear_sbi_flag(sbi, SBI_QUOTA_NEED_FLUSH);
> >  
> > +		/* only failed during mount/umount/freeze/quotactl */
> > +		locked = down_read_trylock(&sbi->sb->s_umount);
> >  		f2fs_quota_sync(sbi->sb, -1);
> > +		if (locked)
> > +			up_read(&sbi->sb->s_umount);
> >  	}
> >  
> >  	f2fs_lock_all(sbi);
> > diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
> > index a28c245b1288..b39f60d57120 100644
> > --- a/fs/f2fs/super.c
> > +++ b/fs/f2fs/super.c
> > @@ -1706,6 +1706,7 @@ static ssize_t f2fs_quota_read(struct super_block *sb, int type, char *data,
> >  				congestion_wait(BLK_RW_ASYNC, HZ/50);
> >  				goto repeat;
> >  			}
> > +			set_sbi_flag(F2FS_SB(sb), SBI_QUOTA_NEED_REPAIR);
> >  			return PTR_ERR(page);
> >  		}
> >  
> > @@ -1717,6 +1718,7 @@ static ssize_t f2fs_quota_read(struct super_block *sb, int type, char *data,
> >  		}
> >  		if (unlikely(!PageUptodate(page))) {
> >  			f2fs_put_page(page, 1);
> > +			set_sbi_flag(F2FS_SB(sb), SBI_QUOTA_NEED_REPAIR);
> >  			return -EIO;
> >  		}
> >  
> > @@ -1758,6 +1760,7 @@ static ssize_t f2fs_quota_write(struct super_block *sb, int type,
> >  				congestion_wait(BLK_RW_ASYNC, HZ/50);
> >  				goto retry;
> >  			}
> > +			set_sbi_flag(F2FS_SB(sb), SBI_QUOTA_NEED_REPAIR);
> >  			break;
> >  		}
> >  
> > @@ -1794,7 +1797,6 @@ static qsize_t *f2fs_get_reserved_space(struct inode *inode)
> >  
> >  static int f2fs_quota_on_mount(struct f2fs_sb_info *sbi, int type)
> >  {
> > -
> >  	if (is_set_ckpt_flags(sbi, CP_QUOTA_NEED_FSCK_FLAG)) {
> >  		f2fs_msg(sbi->sb, KERN_ERR,
> >  			"quota sysfile may be corrupted, skip loading it");
> > 

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