linux-kernel - Re: [PATCH v2 1/3] ext4: define ext4_journal

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Message-ID: <ee1ac3cd-da61-415d-a448-53d4464063e3@huawei.com>
Date: Sat, 8 Mar 2025 09:18:40 +0800
From: Baokun Li <libaokun1@...wei.com>
To: Ojaswin Mujoo <ojaswin@...ux.ibm.com>
CC: <linux-ext4@...r.kernel.org>, Theodore Ts'o <tytso@....edu>, Jan Kara
	<jack@...e.cz>, <linux-kernel@...r.kernel.org>, Yang Erkun
	<yangerkun@...wei.com>
Subject: Re: [PATCH v2 1/3] ext4: define ext4_journal_destroy wrapper

On 2025/3/6 22:28, Ojaswin Mujoo wrote:
> Define an ext4 wrapper over jbd2_journal_destroy to make sure we
> have consistent behavior during journal destruction. This will also
> come useful in the next patch where we add some ext4 specific logic
> in the destroy path.
>
> Signed-off-by: Ojaswin Mujoo <ojaswin@...ux.ibm.com>
Looks good to me.

Reviewed-by: Baokun Li <libaokun1@...wei.com>
> ---
>   fs/ext4/ext4_jbd2.h | 14 ++++++++++++++
>   fs/ext4/super.c     | 16 ++++++----------
>   2 files changed, 20 insertions(+), 10 deletions(-)
>
> diff --git a/fs/ext4/ext4_jbd2.h b/fs/ext4/ext4_jbd2.h
> index 3f2596c9e5f2..9b3c9df02a39 100644
> --- a/fs/ext4/ext4_jbd2.h
> +++ b/fs/ext4/ext4_jbd2.h
> @@ -429,4 +429,18 @@ static inline int ext4_should_dioread_nolock(struct inode *inode)
>   	return 1;
>   }
>   
> +/*
> + * Pass journal explicitly as it may not be cached in the sbi->s_journal in some
> + * cases
> + */
> +static inline int ext4_journal_destroy(struct ext4_sb_info *sbi, journal_t *journal)
> +{
> +	int err = 0;
> +
> +	err = jbd2_journal_destroy(journal);
> +	sbi->s_journal = NULL;
> +
> +	return err;
> +}
> +
>   #endif	/* _EXT4_JBD2_H */
> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
> index a963ffda692a..8ad664d47806 100644
> --- a/fs/ext4/super.c
> +++ b/fs/ext4/super.c
> @@ -1297,8 +1297,7 @@ static void ext4_put_super(struct super_block *sb)
>   
>   	if (sbi->s_journal) {
>   		aborted = is_journal_aborted(sbi->s_journal);
> -		err = jbd2_journal_destroy(sbi->s_journal);
> -		sbi->s_journal = NULL;
> +		err = ext4_journal_destroy(sbi, sbi->s_journal);
>   		if ((err < 0) && !aborted) {
>   			ext4_abort(sb, -err, "Couldn't clean up the journal");
>   		}
> @@ -4960,8 +4959,7 @@ static int ext4_load_and_init_journal(struct super_block *sb,
>   out:
>   	/* flush s_sb_upd_work before destroying the journal. */
>   	flush_work(&sbi->s_sb_upd_work);
> -	jbd2_journal_destroy(sbi->s_journal);
> -	sbi->s_journal = NULL;
> +	ext4_journal_destroy(sbi, sbi->s_journal);
>   	return -EINVAL;
>   }
>   
> @@ -5652,8 +5650,7 @@ failed_mount8: __maybe_unused
>   	if (sbi->s_journal) {
>   		/* flush s_sb_upd_work before journal destroy. */
>   		flush_work(&sbi->s_sb_upd_work);
> -		jbd2_journal_destroy(sbi->s_journal);
> -		sbi->s_journal = NULL;
> +		ext4_journal_destroy(sbi, sbi->s_journal);
>   	}
>   failed_mount3a:
>   	ext4_es_unregister_shrinker(sbi);
> @@ -5958,7 +5955,7 @@ static journal_t *ext4_open_dev_journal(struct super_block *sb,
>   	return journal;
>   
>   out_journal:
> -	jbd2_journal_destroy(journal);
> +	ext4_journal_destroy(EXT4_SB(sb), journal);
>   out_bdev:
>   	bdev_fput(bdev_file);
>   	return ERR_PTR(errno);
> @@ -6075,8 +6072,7 @@ static int ext4_load_journal(struct super_block *sb,
>   	EXT4_SB(sb)->s_journal = journal;
>   	err = ext4_clear_journal_err(sb, es);
>   	if (err) {
> -		EXT4_SB(sb)->s_journal = NULL;
> -		jbd2_journal_destroy(journal);
> +		ext4_journal_destroy(EXT4_SB(sb), journal);
>   		return err;
>   	}
>   
> @@ -6094,7 +6090,7 @@ static int ext4_load_journal(struct super_block *sb,
>   	return 0;
>   
>   err_out:
> -	jbd2_journal_destroy(journal);
> +	ext4_journal_destroy(EXT4_SB(sb), journal);
>   	return err;
>   }
>