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Date:   Mon, 18 May 2020 10:54:00 -0700
From:   Jaegeuk Kim <jaegeuk@kernel.org>
To:     Chao Yu <yuchao0@huawei.com>
Cc:     linux-kernel@vger.kernel.org,
        linux-f2fs-devel@lists.sourceforge.net, kernel-team@android.com
Subject: Re: [f2fs-dev] [PATCH] f2fs: flush dirty meta pages when flushing
 them
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On 05/18, Chao Yu wrote:
> On 2020/5/15 22:45, Jaegeuk Kim wrote:
> > On 05/15, Chao Yu wrote:
> >> On 2020/5/15 10:15, Jaegeuk Kim wrote:
> >>> Let's guarantee flusing dirty meta pages to avoid infinite loop.
> >>
> >> What's the root cause? Race case or meta page flush failure?
> > 
> > Investigating, but at least, this can avoid the inifinite loop there.
> 
> Hmm... this fix may cover the root cause..

We're getting reached out to one related to this issue where single SSA
page is dirtied at the moment. Anyway, I think it'd be fine to get this
as we can detect any fs consistency issue by fsck. So far, I haven't seen
any problem in all my local stress tests.

> 
> Thanks,
> 
> > 
> > V2:
> > 
> >>From c60ce8e7178004fd6cba96e592247e43b5fd98d8 Mon Sep 17 00:00:00 2001
> > From: Jaegeuk Kim <jaegeuk@kernel.org>
> > Date: Wed, 13 May 2020 21:12:53 -0700
> > Subject: [PATCH] f2fs: flush dirty meta pages when flushing them
> > 
> > Let's guarantee flusing dirty meta pages to avoid infinite loop.
> > 
> > Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
> > ---
> >  fs/f2fs/checkpoint.c | 3 +++
> >  1 file changed, 3 insertions(+)
> > 
> > diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
> > index 620a386d82c1a..3dc3ac6fe1432 100644
> > --- a/fs/f2fs/checkpoint.c
> > +++ b/fs/f2fs/checkpoint.c
> > @@ -1266,6 +1266,9 @@ void f2fs_wait_on_all_pages(struct f2fs_sb_info *sbi, int type)
> >  		if (unlikely(f2fs_cp_error(sbi)))
> >  			break;
> >  
> > +		if (type == F2FS_DIRTY_META)
> > +			f2fs_sync_meta_pages(sbi, META, LONG_MAX,
> > +							FS_CP_META_IO);
> >  		io_schedule_timeout(DEFAULT_IO_TIMEOUT);
> >  	}
> >  	finish_wait(&sbi->cp_wait, &wait);
> >