linux-kernel - Re: [PATCH 19/20] ext4: get rid of ppath in convert_initialized

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Message-ID: <Zq1FqACuoNPFh9UJ@li-bb2b2a4c-3307-11b2-a85c-8fa5c3a69313.ibm.com>
Date: Sat, 3 Aug 2024 02:16:32 +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 19/20] ext4: get rid of ppath in
 convert_initialized_extent()

On Wed, Jul 10, 2024 at 12:06:53PM +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 convert_initialized_extent(), the following is
> done here:
> 
>  * Free the extents path when an error is encountered.
> 
> 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 | 37 +++++++++++++++++++------------------
>  1 file changed, 19 insertions(+), 18 deletions(-)
> 
> diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
> index badadcd64e66..737432bb316e 100644
> --- a/fs/ext4/extents.c
> +++ b/fs/ext4/extents.c
> @@ -3810,13 +3810,12 @@ ext4_convert_unwritten_extents_endio(handle_t *handle, struct inode *inode,
>  	return ERR_PTR(err);
>  }
>  
> -static int
> +static struct ext4_ext_path *
>  convert_initialized_extent(handle_t *handle, struct inode *inode,
>  			   struct ext4_map_blocks *map,
> -			   struct ext4_ext_path **ppath,
> +			   struct ext4_ext_path *path,
>  			   unsigned int *allocated)
>  {
> -	struct ext4_ext_path *path = *ppath;
>  	struct ext4_extent *ex;
>  	ext4_lblk_t ee_block;
>  	unsigned int ee_len;
> @@ -3841,29 +3840,25 @@ convert_initialized_extent(handle_t *handle, struct inode *inode,
>  	if (ee_block != map->m_lblk || ee_len > map->m_len) {
>  		path = ext4_split_convert_extents(handle, inode, map, path,
>  				EXT4_GET_BLOCKS_CONVERT_UNWRITTEN, 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;
>  		if (!ex) {
>  			EXT4_ERROR_INODE(inode, "unexpected hole at %lu",
>  					 (unsigned long) map->m_lblk);
> -			return -EFSCORRUPTED;
> +			err = -EFSCORRUPTED;
> +			goto errout;
>  		}
>  	}
>  
>  	err = ext4_ext_get_access(handle, inode, path + depth);
>  	if (err)
> -		return err;
> +		goto errout;
>  	/* first mark the extent as unwritten */
>  	ext4_ext_mark_unwritten(ex);
>  
> @@ -3875,7 +3870,7 @@ convert_initialized_extent(handle_t *handle, struct inode *inode,
>  	/* Mark modified extent as dirty */
>  	err = ext4_ext_dirty(handle, inode, path + path->p_depth);
>  	if (err)
> -		return err;
> +		goto errout;
>  	ext4_ext_show_leaf(inode, path);
>  
>  	ext4_update_inode_fsync_trans(handle, inode, 1);
> @@ -3884,7 +3879,11 @@ convert_initialized_extent(handle_t *handle, struct inode *inode,
>  	if (*allocated > map->m_len)
>  		*allocated = map->m_len;
>  	map->m_len = *allocated;
> -	return 0;
> +	return path;
> +
> +errout:
> +	ext4_free_ext_path(path);
> +	return ERR_PTR(err);
>  }
>  
>  static struct ext4_ext_path *
> @@ -4254,8 +4253,10 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
>  			 */
>  			if ((!ext4_ext_is_unwritten(ex)) &&
>  			    (flags & EXT4_GET_BLOCKS_CONVERT_UNWRITTEN)) {
> -				err = convert_initialized_extent(handle,
> -					inode, map, &path, &allocated);
> +				path = convert_initialized_extent(handle,
> +					inode, map, path, &allocated);
> +				if (IS_ERR(path))
> +					err = PTR_ERR(path);
>  				goto out;
>  			} else if (!ext4_ext_is_unwritten(ex)) {
>  				map->m_flags |= EXT4_MAP_MAPPED;
> -- 
> 2.39.2
>