linux-kernel - Re: [f2fs-dev] [PATCH 3/3] f2fs: fix false alarm on invalid block address

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Message-ID: <Zhmf4klcOr4eplin@google.com>
Date: Fri, 12 Apr 2024 20:56:02 +0000
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 3/3] f2fs: fix false alarm on invalid block
 address

On 04/11, Chao Yu wrote:
> On 2024/4/10 4:34, Jaegeuk Kim wrote:
> > f2fs_ra_meta_pages can try to read ahead on invalid block address which is
> > not the corruption case.
> 
> In which case we will read ahead invalid meta pages? recovery w/ META_POR?

I was trying to debug another issue, but found the root cause. Let me drop this
patch.

> 
> Thanks,
> 
> > 
> > Fixes: 31f85ccc84b8 ("f2fs: unify the error handling of f2fs_is_valid_blkaddr")
> > Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
> > ---
> >   fs/f2fs/checkpoint.c | 9 +++++----
> >   1 file changed, 5 insertions(+), 4 deletions(-)
> > 
> > diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
> > index eac698b8dd38..b01320502624 100644
> > --- a/fs/f2fs/checkpoint.c
> > +++ b/fs/f2fs/checkpoint.c
> > @@ -179,22 +179,22 @@ static bool __f2fs_is_valid_blkaddr(struct f2fs_sb_info *sbi,
> >   		break;
> >   	case META_SIT:
> >   		if (unlikely(blkaddr >= SIT_BLK_CNT(sbi)))
> > -			goto err;
> > +			goto check_only;
> >   		break;
> >   	case META_SSA:
> >   		if (unlikely(blkaddr >= MAIN_BLKADDR(sbi) ||
> >   			blkaddr < SM_I(sbi)->ssa_blkaddr))
> > -			goto err;
> > +			goto check_only;
> >   		break;
> >   	case META_CP:
> >   		if (unlikely(blkaddr >= SIT_I(sbi)->sit_base_addr ||
> >   			blkaddr < __start_cp_addr(sbi)))
> > -			goto err;
> > +			goto check_only;
> >   		break;
> >   	case META_POR:
> >   		if (unlikely(blkaddr >= MAX_BLKADDR(sbi) ||
> >   			blkaddr < MAIN_BLKADDR(sbi)))
> > -			goto err;
> > +			goto check_only;
> >   		break;
> >   	case DATA_GENERIC:
> >   	case DATA_GENERIC_ENHANCE:
> > @@ -228,6 +228,7 @@ static bool __f2fs_is_valid_blkaddr(struct f2fs_sb_info *sbi,
> >   	return true;
> >   err:
> >   	f2fs_handle_error(sbi, ERROR_INVALID_BLKADDR);
> > +check_only:
> >   	return false;
> >   }