Re: [PATCH] btrfs: fix buffer index in wait_eb_writebacks()

[Boris Burkov <boris@bur.io>]

On Tue, Aug 12, 2025 at 07:58:40AM +0900, Naohiro Aota wrote:
> The commit f2cb97ee964a ("btrfs: index buffer_tree using node size")
> changed the index of buffer_tree from "start >> sectorsize_bits" to "start
> >> nodesize_bits". However, the change is not applied for
> wait_eb_writebacks() and caused IO failures by writing in a full zone. Use
> the index properly.
> 
> Fixes: f2cb97ee964a ("btrfs: index buffer_tree using node size")
> Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
Reviewed-by: Boris Burkov <boris@bur.io>
> ---
>  fs/btrfs/zoned.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/btrfs/zoned.c b/fs/btrfs/zoned.c
> index d9b26a48cb48..e264310b8d6b 100644
> --- a/fs/btrfs/zoned.c
> +++ b/fs/btrfs/zoned.c
> @@ -2260,7 +2260,7 @@ static void wait_eb_writebacks(struct btrfs_block_group *block_group)
>  	struct btrfs_fs_info *fs_info = block_group->fs_info;
>  	const u64 end = block_group->start + block_group->length;
>  	struct extent_buffer *eb;
> -	unsigned long index, start = (block_group->start >> fs_info->sectorsize_bits);
> +	unsigned long index, start = (block_group->start >> fs_info->nodesize_bits);
>  
>  	rcu_read_lock();
>  	xa_for_each_start(&fs_info->buffer_tree, index, eb, start) {
> -- 
> 2.50.1
>