Re: [PATCH 3/6] btrfs: defrag: use a single list for each loop in defrag_one_range()

[Anand Suveer Jain <asj@kernel.org>]

On 26/6/26 03:20, fdmanana@kernel.org wrote:
> From: Filipe Manana <fdmanana@suse.com>
> 
> There's no need to have one list for each loop to defrag each subrange and
> then another one to free each subrange (struct defrag_target_range).
> We can do it in a single loop, freeing each subrange after defragging,
> plus no need to delete each subrange from the list since we immediately
> free it.
> 
> Signed-off-by: Filipe Manana <fdmanana@suse.com>
> ---
>  fs/btrfs/defrag.c | 6 +-----
>  1 file changed, 1 insertion(+), 5 deletions(-)
> 
> diff --git a/fs/btrfs/defrag.c b/fs/btrfs/defrag.c
> index 0697b285e05f..ad1d04d8f165 100644
> --- a/fs/btrfs/defrag.c
> +++ b/fs/btrfs/defrag.c
> @@ -1234,16 +1234,12 @@ static int defrag_one_range(struct btrfs_inode *inode, u64 start, u32 len,
>  	if (ret < 0)
>  		goto unlock_extent;
>  
> -	list_for_each_entry(entry, &target_list, list) {
> +	list_for_each_entry_safe(entry, tmp, &target_list, list) {
>  		defrag_one_locked_target(inode, entry, folios, nr_pages, &cached_state);
>  		if (entry->start > last_defrag_end)
>  			btrfs_delalloc_release_space(inode, data_reserved, last_defrag_end,
>  						     entry->start - last_defrag_end, true);
>  		last_defrag_end = entry->start + entry->len;
> -	}
> -
> -	list_for_each_entry_safe(entry, tmp, &target_list, list) {
> -		list_del_init(&entry->list);
>  		kfree(entry);
>  	}
>  unlock_extent:


LGTM.

Reviewed-by: Anand Jain <asj@kernel.org>