linux-kernel - Re: [PATCH] Set the initial TRIM information as TRIMMED

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Message-ID: <4ED72F1D.7070207@tao.ma>
Date:	Thu, 01 Dec 2011 15:39:09 +0800
From:	Tao Ma <tm@....ma>
To:	Kyungmin Park <kmpark@...radead.org>
CC:	tytso@....edu, linux-ext4@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Set the initial TRIM information as TRIMMED

Hi Kyungmin,
On 12/01/2011 03:00 PM, Kyungmin Park wrote:
> From: Kyungmin Park <kyungmin.park@...sung.com>
> 
> Now trim information doesn't stored at disk so every boot time. it's cleared.
> and do the trim all disk groups.
> But assume that it's already trimmed at previous time so don't need to trim it again. So set the intial state as trimmed.
sorry, I don't get your meaning here.
Why can we assume that the group is already trimmed since it isn't
stored in the disk?

Thanks
Tao
> 
> Signed-off-by: Kyungmin Park <kyungmin.park@...sung.com>
> ---
> diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
> index e2d8be8..97ef342 100644
> --- a/fs/ext4/mballoc.c
> +++ b/fs/ext4/mballoc.c
> @@ -1098,6 +1098,12 @@ int ext4_mb_init_group(struct super_block *sb, ext4_group_t group)
>  		goto err;
>  	}
>  	mark_page_accessed(page);
> +
> +	/*
> +	 * TRIM information is not stored at disk so set the initial
> +	 * state as trimmed. Since previous time it's already trimmed all
> +	 */
> +	EXT4_MB_GRP_SET_TRIMMED(this_grp);
>  err:
>  	ext4_mb_put_buddy_page_lock(&e4b);
>  	return ret;

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