Re: [PATCH 04/20] ext4: add new ext4_ext_path_brelse() helper

[Ojaswin Mujoo]

On Wed, Jul 10, 2024 at 12:06:38PM +0800, libaokun@xxxxxxxxxxxxxxx wrote:
> From: Baokun Li <libaokun1@xxxxxxxxxx>
> 
> Add ext4_ext_path_brelse() helper function to reduce duplicate code
> and ensure that path->p_bh is set to NULL after it is released.
> 
> Signed-off-by: Baokun Li <libaokun1@xxxxxxxxxx>

Hi Baokun,

The helper looks good, feel free to add:

Reviewed-by: Ojaswin Mujoo <ojaswin@xxxxxxxxxxxxx>

> ---
>  fs/ext4/extents.c | 24 ++++++++++++------------
>  1 file changed, 12 insertions(+), 12 deletions(-)
> 
> diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
> index 657baf3991c1..6e5b5baf3aa6 100644
> --- a/fs/ext4/extents.c
> +++ b/fs/ext4/extents.c
> @@ -106,6 +106,12 @@ static int ext4_ext_trunc_restart_fn(struct inode *inode, int *dropped)
>  	return 0;
>  }
>  
> +static inline void ext4_ext_path_brelse(struct ext4_ext_path *path)
> +{
> +	brelse(path->p_bh);
> +	path->p_bh = NULL;
> +}
> +
>  static void ext4_ext_drop_refs(struct ext4_ext_path *path)
>  {
>  	int depth, i;
> @@ -113,10 +119,8 @@ static void ext4_ext_drop_refs(struct ext4_ext_path *path)
>  	if (!path)
>  		return;
>  	depth = path->p_depth;
> -	for (i = 0; i <= depth; i++, path++) {
> -		brelse(path->p_bh);
> -		path->p_bh = NULL;
> -	}
> +	for (i = 0; i <= depth; i++, path++)
> +		ext4_ext_path_brelse(path);
>  }
>  
>  void ext4_free_ext_path(struct ext4_ext_path *path)
> @@ -635,8 +639,7 @@ int ext4_ext_precache(struct inode *inode)
>  		 */
>  		if ((i == depth) ||
>  		    path[i].p_idx > EXT_LAST_INDEX(path[i].p_hdr)) {
> -			brelse(path[i].p_bh);
> -			path[i].p_bh = NULL;
> +			ext4_ext_path_brelse(path + i);
>  			i--;
>  			continue;
>  		}
> @@ -1887,8 +1890,7 @@ static void ext4_ext_try_to_merge_up(handle_t *handle,
>  		(path[1].p_ext - EXT_FIRST_EXTENT(path[1].p_hdr));
>  	path[0].p_hdr->eh_max = cpu_to_le16(max_root);
>  
> -	brelse(path[1].p_bh);
> -	path[1].p_bh = NULL;
> +	ext4_ext_path_brelse(path + 1);
>  	ext4_free_blocks(handle, inode, NULL, blk, 1,
>  			 EXT4_FREE_BLOCKS_METADATA | EXT4_FREE_BLOCKS_FORGET);
>  }
> @@ -2956,8 +2958,7 @@ int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
>  			err = ext4_ext_rm_leaf(handle, inode, path,
>  					       &partial, start, end);
>  			/* root level has p_bh == NULL, brelse() eats this */
> -			brelse(path[i].p_bh);
> -			path[i].p_bh = NULL;
> +			ext4_ext_path_brelse(path + i);
>  			i--;
>  			continue;
>  		}
> @@ -3019,8 +3020,7 @@ int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
>  				err = ext4_ext_rm_idx(handle, inode, path, i);
>  			}
>  			/* root level has p_bh == NULL, brelse() eats this */
> -			brelse(path[i].p_bh);
> -			path[i].p_bh = NULL;
> +			ext4_ext_path_brelse(path + i);
>  			i--;
>  			ext_debug(inode, "return to level %d\n", i);
>  		}
> -- 
> 2.39.2
>