linux-kernel - Re: [PATCH 16/20] ext4: get rid of ppath in ext4_convert_unwritten_extents

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Message-ID: <Zq1Bb7eeV5m7HNBS@li-bb2b2a4c-3307-11b2-a85c-8fa5c3a69313.ibm.com>
Date: Sat, 3 Aug 2024 01:58:31 +0530
From: Ojaswin Mujoo <ojaswin@...ux.ibm.com>
To: libaokun@...weicloud.com
Cc: linux-ext4@...r.kernel.org, tytso@....edu, adilger.kernel@...ger.ca,
        jack@...e.cz, ritesh.list@...il.com, linux-kernel@...r.kernel.org,
        yi.zhang@...wei.com, yangerkun@...wei.com,
        Baokun Li <libaokun1@...wei.com>
Subject: Re: [PATCH 16/20] ext4: get rid of ppath in
 ext4_convert_unwritten_extents_endio()

On Wed, Jul 10, 2024 at 12:06:50PM +0800, libaokun@...weicloud.com wrote:
> From: Baokun Li <libaokun1@...wei.com>
> 
> The use of path and ppath is now very confusing, so to make the code more
> readable, pass path between functions uniformly, and get rid of ppath.
> 
> To get rid of the ppath in ext4_convert_unwritten_extents_endio(), the
> following is done here:
> 
>  * Free the extents path when an error is encountered.
>  * Its caller needs to update ppath if it uses ppath.
> 
> No functional changes.
> 
> Signed-off-by: Baokun Li <libaokun1@...wei.com>

Looks good Baokun, feel free to add:

Reviewed-by: Ojaswin Mujoo <ojaswin@...ux.ibm.com>

Regards,
ojaswin

> ---
>  fs/ext4/extents.c | 43 +++++++++++++++++++++++--------------------
>  1 file changed, 23 insertions(+), 20 deletions(-)
> 
> diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
> index a41cbb8c4475..b7f443f98e9d 100644
> --- a/fs/ext4/extents.c
> +++ b/fs/ext4/extents.c
> @@ -3745,12 +3745,11 @@ static struct ext4_ext_path *ext4_split_convert_extents(handle_t *handle,
>  				 allocated);
>  }
>  
> -static int ext4_convert_unwritten_extents_endio(handle_t *handle,
> -						struct inode *inode,
> -						struct ext4_map_blocks *map,
> -						struct ext4_ext_path **ppath)
> +static struct ext4_ext_path *
> +ext4_convert_unwritten_extents_endio(handle_t *handle, struct inode *inode,
> +				     struct ext4_map_blocks *map,
> +				     struct ext4_ext_path *path)
>  {
> -	struct ext4_ext_path *path = *ppath;
>  	struct ext4_extent *ex;
>  	ext4_lblk_t ee_block;
>  	unsigned int ee_len;
> @@ -3780,24 +3779,19 @@ static int ext4_convert_unwritten_extents_endio(handle_t *handle,
>  #endif
>  		path = ext4_split_convert_extents(handle, inode, map, path,
>  						EXT4_GET_BLOCKS_CONVERT, NULL);
> -		if (IS_ERR(path)) {
> -			*ppath = NULL;
> -			return PTR_ERR(path);
> -		}
> +		if (IS_ERR(path))
> +			return path;
>  
>  		path = ext4_find_extent(inode, map->m_lblk, path, 0);
> -		if (IS_ERR(path)) {
> -			*ppath = NULL;
> -			return PTR_ERR(path);
> -		}
> -		*ppath = path;
> +		if (IS_ERR(path))
> +			return path;
>  		depth = ext_depth(inode);
>  		ex = path[depth].p_ext;
>  	}
>  
>  	err = ext4_ext_get_access(handle, inode, path + depth);
>  	if (err)
> -		goto out;
> +		goto errout;
>  	/* first mark the extent as initialized */
>  	ext4_ext_mark_initialized(ex);
>  
> @@ -3808,9 +3802,15 @@ static int ext4_convert_unwritten_extents_endio(handle_t *handle,
>  
>  	/* Mark modified extent as dirty */
>  	err = ext4_ext_dirty(handle, inode, path + path->p_depth);
> -out:
> +	if (err)
> +		goto errout;
> +
>  	ext4_ext_show_leaf(inode, path);
> -	return err;
> +	return path;
> +
> +errout:
> +	ext4_free_ext_path(path);
> +	return ERR_PTR(err);
>  }
>  
>  static int
> @@ -3938,10 +3938,13 @@ ext4_ext_handle_unwritten_extents(handle_t *handle, struct inode *inode,
>  	}
>  	/* IO end_io complete, convert the filled extent to written */
>  	if (flags & EXT4_GET_BLOCKS_CONVERT) {
> -		err = ext4_convert_unwritten_extents_endio(handle, inode, map,
> -							   ppath);
> -		if (err < 0)
> +		*ppath = ext4_convert_unwritten_extents_endio(handle, inode,
> +							      map, *ppath);
> +		if (IS_ERR(*ppath)) {
> +			err = PTR_ERR(*ppath);
> +			*ppath = NULL;
>  			goto out2;
> +		}
>  		ext4_update_inode_fsync_trans(handle, inode, 1);
>  		goto map_out;
>  	}
> -- 
> 2.39.2
>