linux-ext4 - Re: [PATCH] ext4: forbid commit inconsistent quota data when errors=remount-ro

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Message-ID: <20240122115044.pbh6womwasoct36f@quack3>
Date: Mon, 22 Jan 2024 12:50:44 +0100
From: Jan Kara <jack@...e.cz>
To: Ye Bin <yebin10@...wei.com>
Cc: tytso@....edu, adilger.kernel@...ger.ca, linux-ext4@...r.kernel.org,
	linux-kernel@...r.kernel.org, jack@...e.cz
Subject: Re: [PATCH] ext4: forbid commit inconsistent quota data when
 errors=remount-ro

On Fri 19-01-24 14:29:08, Ye Bin wrote:
> There's issue as follows When do IO fault injection test:
> Quota error (device dm-3): find_block_dqentry: Quota for id 101 referenced but not present
> Quota error (device dm-3): qtree_read_dquot: Can't read quota structure for id 101
> Quota error (device dm-3): do_check_range: Getting block 2021161007 out of range 1-186
> Quota error (device dm-3): qtree_read_dquot: Can't read quota structure for id 661
> 
> Now, ext4_write_dquot()/ext4_acquire_dquot()/ext4_release_dquot() may commit
> inconsistent quota data even if process failed. This may lead to filesystem
> corruption.
> To ensure filesystem consistent when errors=remount-ro there is need to call
> ext4_handle_error() to abort journal.
> 
> Signed-off-by: Ye Bin <yebin10@...wei.com>

After thinking about this for a while I agree. Feel free to add:

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

								Honza

> ---
>  fs/ext4/super.c | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
> index 0980845c8b8f..ef41b452173e 100644
> --- a/fs/ext4/super.c
> +++ b/fs/ext4/super.c
> @@ -6873,6 +6873,10 @@ static int ext4_write_dquot(struct dquot *dquot)
>  	if (IS_ERR(handle))
>  		return PTR_ERR(handle);
>  	ret = dquot_commit(dquot);
> +	if (ret < 0)
> +		ext4_error_err(dquot->dq_sb, -ret,
> +			       "Failed to commit dquot type %d",
> +			       dquot->dq_id.type);
>  	err = ext4_journal_stop(handle);
>  	if (!ret)
>  		ret = err;
> @@ -6889,6 +6893,10 @@ static int ext4_acquire_dquot(struct dquot *dquot)
>  	if (IS_ERR(handle))
>  		return PTR_ERR(handle);
>  	ret = dquot_acquire(dquot);
> +	if (ret < 0)
> +		ext4_error_err(dquot->dq_sb, -ret,
> +			      "Failed to acquire dquot type %d",
> +			      dquot->dq_id.type);
>  	err = ext4_journal_stop(handle);
>  	if (!ret)
>  		ret = err;
> @@ -6908,6 +6916,10 @@ static int ext4_release_dquot(struct dquot *dquot)
>  		return PTR_ERR(handle);
>  	}
>  	ret = dquot_release(dquot);
> +	if (ret < 0)
> +		ext4_error_err(dquot->dq_sb, -ret,
> +			       "Failed to release dquot type %d",
> +			       dquot->dq_id.type);
>  	err = ext4_journal_stop(handle);
>  	if (!ret)
>  		ret = err;
> -- 
> 2.31.1
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR