linux-kernel - Re: [f2fs-dev] [PATCH] f2fs: fix to set flush_merge opt and show noflush

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Message-ID: <423b0738-e72a-7ae8-72dc-40f924d9fe0d@kernel.org>
Date:   Sat, 29 Oct 2022 12:18:12 +0800
From:   Chao Yu <chao@...nel.org>
To:     Yangtao Li <frank.li@...o.com>, jaegeuk@...nel.org
Cc:     linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [f2fs-dev] [PATCH] f2fs: fix to set flush_merge opt and show
 noflush_merge

On 2022/10/26 21:05, Yangtao Li via Linux-f2fs-devel wrote:
> Some minor modifications to flush_merge and related parameters:
> 
>    1.The FLUSH_MERGE opt is set by default only in non-ro mode.
>    2.When ro and merge are set at the same time, an error is reported.
>    3.Display noflush_merge mount opt.
> 
> Signed-off-by: Yangtao Li <frank.li@...o.com>
> ---
>   fs/f2fs/super.c | 13 +++++++++++--
>   1 file changed, 11 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
> index 3834ead04620..475fa10c6007 100644
> --- a/fs/f2fs/super.c
> +++ b/fs/f2fs/super.c
> @@ -1347,6 +1347,12 @@ static int parse_options(struct super_block *sb, char *options, bool is_remount)
>   		return -EINVAL;
>   	}
>   
> +	if ((f2fs_sb_has_readonly(sbi) || f2fs_readonly(sbi->sb))
> +		 && test_opt(sbi, FLUSH_MERGE)) {

One more blank before &&.

> +		f2fs_err(sbi, "FLUSH_MERGE not compatible with readonly mode");
> +		return -EINVAL;
> +	}
> +
>   	if (f2fs_sb_has_readonly(sbi) && !f2fs_readonly(sbi->sb)) {
>   		f2fs_err(sbi, "Allow to mount readonly mode only");
>   		return -EROFS;
> @@ -1935,8 +1941,10 @@ static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
>   		seq_puts(seq, ",inline_dentry");
>   	else
>   		seq_puts(seq, ",noinline_dentry");
> -	if (!f2fs_readonly(sbi->sb) && test_opt(sbi, FLUSH_MERGE))
> +	if (test_opt(sbi, FLUSH_MERGE))
>   		seq_puts(seq, ",flush_merge");
> +	else
> +		seq_puts(seq, ",noflush_merge");
>   	if (test_opt(sbi, NOBARRIER))
>   		seq_puts(seq, ",nobarrier");
>   	if (test_opt(sbi, FASTBOOT))
> @@ -2065,7 +2073,8 @@ static void default_options(struct f2fs_sb_info *sbi)
>   	set_opt(sbi, MERGE_CHECKPOINT);
>   	F2FS_OPTION(sbi).unusable_cap = 0;
>   	sbi->sb->s_flags |= SB_LAZYTIME;
> -	set_opt(sbi, FLUSH_MERGE);
> +	if (!(f2fs_sb_has_readonly(sbi) || f2fs_readonly(sbi->sb)))

How about using more explicit condition?

if (!f2fs_sb_has_readonly(sbi) && !f2fs_readonly(sbi->sb)))

> +		set_opt(sbi, FLUSH_MERGE);
>   	if (f2fs_hw_support_discard(sbi) || f2fs_hw_should_discard(sbi))
>   		set_opt(sbi, DISCARD);
>   	if (f2fs_sb_has_blkzoned(sbi)) {