linux-kernel - Re: [PATCH] f2fs: enable real-time discard by default

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Date:   Fri, 6 Jul 2018 18:13:48 -0700
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     Chao Yu <yuchao0@...wei.com>
Cc:     linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org, chao@...nel.org
Subject: Re: [PATCH] f2fs: enable real-time discard by default

On 07/05, Chao Yu wrote:
> f2fs is focused on flash based storage, so let's enable real-time
> discard by default, if user don't want to enable it, 'nodiscard'
> mount option should be used on mount.
> 
> Signed-off-by: Chao Yu <yuchao0@...wei.com>
> ---
>  fs/f2fs/super.c | 7 +++----
>  1 file changed, 3 insertions(+), 4 deletions(-)
> 
> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
> index 848badda50ad..980edeb0b650 100644
> --- a/fs/f2fs/super.c
> +++ b/fs/f2fs/super.c
> @@ -1366,12 +1366,11 @@ static void default_options(struct f2fs_sb_info *sbi)
>  	set_opt(sbi, NOHEAP);
>  	sbi->sb->s_flags |= SB_LAZYTIME;
>  	set_opt(sbi, FLUSH_MERGE);
> -	if (f2fs_sb_has_blkzoned(sbi->sb)) {

I added this.

	if (blk_queue_discard(bdev_get_queue(sbi->sb->s_bdev)))

> +	set_opt(sbi, DISCARD);
> +	if (f2fs_sb_has_blkzoned(sbi->sb))
>  		set_opt_mode(sbi, F2FS_MOUNT_LFS);
> -		set_opt(sbi, DISCARD);
> -	} else {
> +	else
>  		set_opt_mode(sbi, F2FS_MOUNT_ADAPTIVE);
> -	}
>  
>  #ifdef CONFIG_F2FS_FS_XATTR
>  	set_opt(sbi, XATTR_USER);
> -- 
> 2.18.0.rc1