Re: [PATCH] btrfs: drop unused argument of calcu_metadata_size()

[Qu Wenruo <quwenruo.btrfs@gmx.com>]

在 2024/4/24 16:08, Naohiro Aota 写道:
> calcu_metadata_size() has a "reserve" argument, but the only caller always
> set it to "1". The other usage (reserve = 0) is dropped by a commit
> 0647bf564f1e ("Btrfs: improve forever loop when doing balance relocation"),
> which is more than 10 years ago. Drop the argument and simplify the code.
>
> Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>

Reviewed-by: Qu Wenruo <wqu@suse.com>

Thanks,
Qu

> ---
>   fs/btrfs/relocation.c | 9 ++++-----
>   1 file changed, 4 insertions(+), 5 deletions(-)
>
> diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c
> index bd573a0ec270..22086e840801 100644
> --- a/fs/btrfs/relocation.c
> +++ b/fs/btrfs/relocation.c
> @@ -2281,8 +2281,7 @@ struct btrfs_root *select_one_root(struct btrfs_backref_node *node)
>   }
>
>   static noinline_for_stack
> -u64 calcu_metadata_size(struct reloc_control *rc,
> -			struct btrfs_backref_node *node, int reserve)
> +u64 calcu_metadata_size(struct reloc_control *rc, struct btrfs_backref_node *node)
>   {
>   	struct btrfs_fs_info *fs_info = rc->extent_root->fs_info;
>   	struct btrfs_backref_node *next = node;
> @@ -2291,12 +2290,12 @@ u64 calcu_metadata_size(struct reloc_control *rc,
>   	u64 num_bytes = 0;
>   	int index = 0;
>
> -	BUG_ON(reserve && node->processed);
> +	BUG_ON(node->processed);
>
>   	while (next) {
>   		cond_resched();
>   		while (1) {
> -			if (next->processed && (reserve || next != node))
> +			if (next->processed)
>   				break;
>
>   			num_bytes += fs_info->nodesize;
> @@ -2324,7 +2323,7 @@ static int reserve_metadata_space(struct btrfs_trans_handle *trans,
>   	int ret;
>   	u64 tmp;
>
> -	num_bytes = calcu_metadata_size(rc, node, 1) * 2;
> +	num_bytes = calcu_metadata_size(rc, node) * 2;
>
>   	trans->block_rsv = rc->block_rsv;
>   	rc->reserved_bytes += num_bytes;