linux-kernel - Re: [f2fs-dev] [PATCH] f2fs: skip adding a discard command if exists

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Message-ID: <ZVQwz5ubx9LojzEf@google.com>
Date:   Tue, 14 Nov 2023 18:45:35 -0800
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     Chao Yu <chao@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [f2fs-dev] [PATCH] f2fs: skip adding a discard command if exists

On 11/15, Chao Yu wrote:
> On 2023/11/15 5:24, Jaegeuk Kim wrote:
> > When recovering zoned UFS, sometimes we add the same zone to discard multiple
> > times. Simple workaround is to bypass adding it.
> 
> What about skipping f2fs_bug_on() just for zoned UFS case? so that the check
> condition can still be used for non-zoned UFS case.

Hmm, I've never seen this bug_on before, but even this really happens, it does
not make sense to move forward to create duplicate commands resulting in a loop.

So, the question is, do we really need to check this? Have we hit this before?

> 
> Thanks,
> 
> > 
> > Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
> > ---
> >   fs/f2fs/segment.c | 3 ++-
> >   1 file changed, 2 insertions(+), 1 deletion(-)
> > 
> > diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
> > index 727d016318f9..f4ffd64b44b2 100644
> > --- a/fs/f2fs/segment.c
> > +++ b/fs/f2fs/segment.c
> > @@ -1380,7 +1380,8 @@ static void __insert_discard_cmd(struct f2fs_sb_info *sbi,
> >   			p = &(*p)->rb_right;
> >   			leftmost = false;
> >   		} else {
> > -			f2fs_bug_on(sbi, 1);
> > +			/* Let's skip to add, if exists */
> > +			return;
> >   		}
> >   	}