linux-kernel - Re: [PATCH v5 1/2] ext4: commit super block if fs record error when journal record without error

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Date:   Tue, 7 Mar 2023 10:02:35 +0100
From:   Jan Kara <jack@...e.cz>
To:     Ye Bin <yebin@...weicloud.com>
Cc:     tytso@....edu, adilger.kernel@...ger.ca,
        linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
        jack@...e.cz, Ye Bin <yebin10@...wei.com>
Subject: Re: [PATCH v5 1/2] ext4: commit super block if fs record error when
 journal record without error

On Tue 07-03-23 14:17:02, Ye Bin wrote:
> From: Ye Bin <yebin10@...wei.com>
> 
> Now, 'es->s_state' maybe covered by recover journal. And journal errno
> maybe not recorded in journal sb as IO error. ext4_update_super() only
> update error information when 'sbi->s_add_error_count' large than zero.
> Then 'EXT4_ERROR_FS' flag maybe lost.
> To solve above issue just recover 'es->s_state' error flag after journal
> replay like error info.
> 
> Signed-off-by: Ye Bin <yebin10@...wei.com>

Looks good to me. Feel free to add:

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

								Honza

> ---
>  fs/ext4/super.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
> index 88f7b8a88c76..dfa31eea1346 100644
> --- a/fs/ext4/super.c
> +++ b/fs/ext4/super.c
> @@ -5920,6 +5920,7 @@ static int ext4_load_journal(struct super_block *sb,
>  		err = jbd2_journal_wipe(journal, !really_read_only);
>  	if (!err) {
>  		char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
> +
>  		if (save)
>  			memcpy(save, ((char *) es) +
>  			       EXT4_S_ERR_START, EXT4_S_ERR_LEN);
> @@ -5928,6 +5929,14 @@ static int ext4_load_journal(struct super_block *sb,
>  			memcpy(((char *) es) + EXT4_S_ERR_START,
>  			       save, EXT4_S_ERR_LEN);
>  		kfree(save);
> +		es->s_state |= cpu_to_le16(EXT4_SB(sb)->s_mount_state &
> +					   EXT4_ERROR_FS);
> +		/* Write out restored error information to the superblock */
> +		if (!bdev_read_only(sb->s_bdev)) {
> +			int err2;
> +			err2 = ext4_commit_super(sb);
> +			err = err ? : err2;
> +		}
>  	}
>  
>  	if (err) {
> -- 
> 2.31.1
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR