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

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Message-ID: <20210525134220.GE4112@quack2.suse.cz>
Date:   Tue, 25 May 2021 15:42:20 +0200
From:   Jan Kara <jack@...e.cz>
To:     Chao Yu <yuchao0@...wei.com>
Cc:     jaegeuk@...nel.org, linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org, chao@...nel.org,
        Zhang Yi <yi.zhang@...wei.com>, Jan Kara <jack@...e.cz>
Subject: Re: [PATCH] f2fs: avoid attaching SB_ACTIVE flag during mount/remount

On Tue 25-05-21 19:39:09, 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()
> - f2fs_disable_checkpoint()
> 
> Let's get rid of this hack as well in f2fs.
> 
> Cc: Zhang Yi <yi.zhang@...wei.com>
> Cc: Jan Kara <jack@...e.cz>
> Signed-off-by: Chao Yu <yuchao0@...wei.com>

Makes sense to me. You can add:

Acked-by: Jan Kara <jack@...e.cz>

								Honza

> ---
>  fs/f2fs/checkpoint.c |  3 ---
>  fs/f2fs/recovery.c   |  8 ++------
>  fs/f2fs/super.c      | 11 ++++-------
>  3 files changed, 6 insertions(+), 16 deletions(-)
> 
> diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
> index 6c208108d69c..a578c7d13d81 100644
> --- a/fs/f2fs/checkpoint.c
> +++ b/fs/f2fs/checkpoint.c
> @@ -691,9 +691,6 @@ 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 4b2f7d1d5bf4..4cfe36fa41be 100644
> --- a/fs/f2fs/recovery.c
> +++ b/fs/f2fs/recovery.c
> @@ -782,8 +782,6 @@ 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
> @@ -811,10 +809,8 @@ 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);
>  
> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
> index 0a77808ebb8f..e7bd983fbddc 100644
> --- a/fs/f2fs/super.c
> +++ b/fs/f2fs/super.c
> @@ -1881,17 +1881,15 @@ static int f2fs_enable_quotas(struct super_block *sb);
>  
>  static int f2fs_disable_checkpoint(struct f2fs_sb_info *sbi)
>  {
> -	unsigned int s_flags = sbi->sb->s_flags;
>  	struct cp_control cpc;
>  	int err = 0;
>  	int ret;
>  	block_t unusable;
>  
> -	if (s_flags & SB_RDONLY) {
> +	if (sbi->sb->s_flags & SB_RDONLY) {
>  		f2fs_err(sbi, "checkpoint=disable on readonly fs");
>  		return -EINVAL;
>  	}
> -	sbi->sb->s_flags |= SB_ACTIVE;
>  
>  	f2fs_update_time(sbi, DISABLE_TIME);
>  
> @@ -1909,13 +1907,13 @@ static int f2fs_disable_checkpoint(struct f2fs_sb_info *sbi)
>  	ret = sync_filesystem(sbi->sb);
>  	if (ret || err) {
>  		err = ret ? ret : err;
> -		goto restore_flag;
> +		goto out;
>  	}
>  
>  	unusable = f2fs_get_unusable_blocks(sbi);
>  	if (f2fs_disable_cp_again(sbi, unusable)) {
>  		err = -EAGAIN;
> -		goto restore_flag;
> +		goto out;
>  	}
>  
>  	down_write(&sbi->gc_lock);
> @@ -1931,8 +1929,7 @@ static int f2fs_disable_checkpoint(struct f2fs_sb_info *sbi)
>  
>  out_unlock:
>  	up_write(&sbi->gc_lock);
> -restore_flag:
> -	sbi->sb->s_flags = s_flags;	/* Restore SB_RDONLY status */
> +out:
>  	return err;
>  }
>  
> -- 
> 2.29.2
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR