linux-kernel - Re: [PATCH v2] f2fs: avoid attaching SB

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Date:   Fri, 3 Sep 2021 17:17:40 -0700
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     Chao Yu <chao@...nel.org>
Cc:     linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org, Chao Yu <chao.yu@...ux.dev>,
        Zhang Yi <yi.zhang@...wei.com>, Jan Kara <jack@...e.cz>
Subject: Re: [PATCH v2] f2fs: avoid attaching SB_ACTIVE flag during mount

I remember this gave a regression before?

On 09/01, Chao Yu wrote:
> Quoted from [1]
> 
> "I do remember that I've added this code back then because otherwise
> orphan cleanup was losing updates to quota files. But you're right
> that now I don't see how that could be happening and it would be nice
> if we could get rid of this hack"
> 
> [1] https://lore.kernel.org/linux-ext4/99cce8ca-e4a0-7301-840f-2ace67c551f3@huawei.com/T/#m04990cfbc4f44592421736b504afcc346b2a7c00
> 
> Related fix in ext4 by
> commit 72ffb49a7b62 ("ext4: do not set SB_ACTIVE in ext4_orphan_cleanup()").
> 
> f2fs has the same hack implementation in
> - f2fs_recover_orphan_inodes()
> - f2fs_recover_fsync_data()
> 
> Let's get rid of this hack as well in f2fs.
> 
> Cc: Zhang Yi <yi.zhang@...wei.com>
> Cc: Jan Kara <jack@...e.cz>
> Acked-by: Jan Kara <jack@...e.cz>
> Signed-off-by: Chao Yu <chao@...nel.org>
> ---
> v2:
> - don't bother checkpoint disabling path
>  fs/f2fs/checkpoint.c | 3 ---
>  fs/f2fs/recovery.c   | 8 ++------
>  2 files changed, 2 insertions(+), 9 deletions(-)
> 
> diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
> index 83e9bc0f91ff..7d8803a4cbc2 100644
> --- a/fs/f2fs/checkpoint.c
> +++ b/fs/f2fs/checkpoint.c
> @@ -705,9 +705,6 @@ int f2fs_recover_orphan_inodes(struct f2fs_sb_info *sbi)
>  	}
>  
>  #ifdef CONFIG_QUOTA
> -	/* Needed for iput() to work correctly and not trash data */
> -	sbi->sb->s_flags |= SB_ACTIVE;
> -
>  	/*
>  	 * Turn on quotas which were not enabled for read-only mounts if
>  	 * filesystem has quota feature, so that they are updated correctly.
> diff --git a/fs/f2fs/recovery.c b/fs/f2fs/recovery.c
> index 04655511d7f5..706ddb3c95c0 100644
> --- a/fs/f2fs/recovery.c
> +++ b/fs/f2fs/recovery.c
> @@ -787,8 +787,6 @@ int f2fs_recover_fsync_data(struct f2fs_sb_info *sbi, bool check_only)
>  	}
>  
>  #ifdef CONFIG_QUOTA
> -	/* Needed for iput() to work correctly and not trash data */
> -	sbi->sb->s_flags |= SB_ACTIVE;
>  	/* Turn on quotas so that they are updated correctly */
>  	quota_enabled = f2fs_enable_quota_files(sbi, s_flags & SB_RDONLY);
>  #endif
> @@ -816,10 +814,8 @@ int f2fs_recover_fsync_data(struct f2fs_sb_info *sbi, bool check_only)
>  	err = recover_data(sbi, &inode_list, &tmp_inode_list, &dir_list);
>  	if (!err)
>  		f2fs_bug_on(sbi, !list_empty(&inode_list));
> -	else {
> -		/* restore s_flags to let iput() trash data */
> -		sbi->sb->s_flags = s_flags;
> -	}
> +	else
> +		f2fs_bug_on(sbi, sbi->sb->s_flags & SB_ACTIVE);
>  skip:
>  	fix_curseg_write_pointer = !check_only || list_empty(&inode_list);
>  
> -- 
> 2.32.0