linux-ext4 - Re: [PATCH v3 3/3] ext4: cleanup for ext4_map

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Message-ID: <402fea1c-33ee-4e4c-a7b2-7cca54ab5351@huawei.com>
Date: Sat, 8 Nov 2025 09:54:36 +0800
From: Baokun Li <libaokun1@...wei.com>
To: Yang Erkun <yangerkun@...wei.com>
CC: <yi.zhang@...wei.com>, <yangerkun@...weicloud.com>,
	<linux-ext4@...r.kernel.org>, <tytso@....edu>, <adilger.kernel@...ger.ca>,
	<jack@...e.cz>, Baokun Li <libaokun1@...wei.com>
Subject: Re: [PATCH v3 3/3] ext4: cleanup for ext4_map_blocks

On 2025-11-07 19:58, Yang Erkun wrote:
> Retval from ext4_map_create_blocks means we really create some blocks,
> cannot happened with m_flags without EXT4_MAP_UNWRITTEN and
> EXT4_MAP_MAPPED.
>
> Reviewed-by: Zhang Yi <yi.zhang@...wei.com>
> Reviewed-by: Jan Kara <jack@...e.cz>
> Signed-off-by: Yang Erkun <yangerkun@...wei.com>

Looks good. Feel free to add:

Reviewed-by: Baokun Li <libaokun1@...wei.com>

> ---
>  fs/ext4/inode.c | 16 +++++++++-------
>  1 file changed, 9 insertions(+), 7 deletions(-)
>
> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> index e8bac93ca668..3d8ada26d5cd 100644
> --- a/fs/ext4/inode.c
> +++ b/fs/ext4/inode.c
> @@ -799,7 +799,13 @@ int ext4_map_blocks(handle_t *handle, struct inode *inode,
>  	down_write(&EXT4_I(inode)->i_data_sem);
>  	retval = ext4_map_create_blocks(handle, inode, map, flags);
>  	up_write((&EXT4_I(inode)->i_data_sem));
> -	if (retval > 0 && map->m_flags & EXT4_MAP_MAPPED) {
> +
> +	if (retval < 0)
> +		ext_debug(inode, "failed with err %d\n", retval);
> +	if (retval <= 0)
> +		return retval;
> +
> +	if (map->m_flags & EXT4_MAP_MAPPED) {
>  		ret = check_block_validity(inode, map);
>  		if (ret != 0)
>  			return ret;
> @@ -828,12 +834,8 @@ int ext4_map_blocks(handle_t *handle, struct inode *inode,
>  				return ret;
>  		}
>  	}
> -	if (retval > 0 && (map->m_flags & EXT4_MAP_UNWRITTEN ||
> -				map->m_flags & EXT4_MAP_MAPPED))
> -		ext4_fc_track_range(handle, inode, map->m_lblk,
> -					map->m_lblk + map->m_len - 1);
> -	if (retval < 0)
> -		ext_debug(inode, "failed with err %d\n", retval);
> +	ext4_fc_track_range(handle, inode, map->m_lblk, map->m_lblk +
> +			    map->m_len - 1);
>  	return retval;
>  }
>