linux-kernel - Re: [PATCH v4 2/2] btrfs: reserve new relocation block-group after successful relocation

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Date: Fri, 24 May 2024 08:33:19 +0000
From: Naohiro Aota <Naohiro.Aota@....com>
To: Johannes Thumshirn <jth@...nel.org>
CC: Chris Mason <clm@...com>, Josef Bacik <josef@...icpanda.com>, David Sterba
	<dsterba@...e.com>, Hans Holmberg <Hans.Holmberg@....com>,
	"linux-btrfs@...r.kernel.org" <linux-btrfs@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Filipe Manana
	<fdmanana@...e.com>, Johannes Thumshirn <Johannes.Thumshirn@....com>
Subject: Re: [PATCH v4 2/2] btrfs: reserve new relocation block-group after
 successful relocation

On Thu, May 23, 2024 at 05:21:59PM GMT, Johannes Thumshirn wrote:
> From: Johannes Thumshirn <johannes.thumshirn@....com>
> 
> After we've committed a relocation transaction, we know we have just freed
> up space. Set it as hint for the next relocation.
> 
> Signed-off-by: Johannes Thumshirn <johannes.thumshirn@....com>

Reviewed-by: Naohiro Aota <naohiro.aota@....com>

Regards,

> ---
>  fs/btrfs/relocation.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c
> index 5f1a909a1d91..02a9ebf96a95 100644
> --- a/fs/btrfs/relocation.c
> +++ b/fs/btrfs/relocation.c
> @@ -3811,6 +3811,13 @@ static noinline_for_stack int relocate_block_group(struct reloc_control *rc)
>  	ret = btrfs_commit_transaction(trans);
>  	if (ret && !err)
>  		err = ret;
> +
> +	/*
> +	 * We know we have just freed space, set it as hint for the
> +	 * next relocation.
> +	 */
> +	if (!err)
> +		btrfs_reserve_relocation_bg(fs_info);
>  out_free:
>  	ret = clean_dirty_subvols(rc);
>  	if (ret < 0 && !err)
> 
> -- 
> 2.43.0
>