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

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Message-ID: <050a93dc-d9a8-44bd-9a83-83718e95f04d@kernel.org>
Date: Thu, 11 Apr 2024 17:08:44 +0800
From: Chao Yu <chao@...nel.org>
To: Jaegeuk Kim <jaegeuk@...nel.org>, 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 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?

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;
>   }
>