linux-ext4 - Re: [PATCH 3/4] ext4: cleanup for ext4_map

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Message-ID: <2ce98373-7c5f-45a7-bb21-82b4559a80fe@huaweicloud.com>
Date: Mon, 3 Nov 2025 14:19:16 +0800
From: Zhang Yi <yi.zhang@...weicloud.com>
To: Yang Erkun <yangerkun@...wei.com>, linux-ext4@...r.kernel.org,
 tytso@....edu, adilger.kernel@...ger.ca, jack@...e.cz
Cc: libaokun1@...wei.com, yangerkun@...weicloud.com
Subject: Re: [PATCH 3/4] ext4: cleanup for ext4_map_blocks

On 10/27/2025 8:23 PM, 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.
> 
> Signed-off-by: Yang Erkun <yangerkun@...wei.com>

Looks good to me.

Reviewed-by: Zhang Yi <yi.zhang@...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;
>  }
>