linux-kernel - RE: [PATCH 1/2] exfat: call sync_filesystem for read-only remount

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Date:   Mon, 15 Jun 2020 09:14:41 +0900
From:   "Namjae Jeon" <namjae.jeon@...sung.com>
To:     "'Hyunchul Lee'" <hyc.lee@...il.com>
Cc:     <linux-fsdevel@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        "'Sungjong Seo'" <sj1557.seo@...sung.com>
Subject: RE: [PATCH 1/2] exfat: call sync_filesystem for read-only remount

Hi Hyunchul,
> We need to commit dirty metadata and pages to disk before remounting exfat as read-only.
> 
> This fixes a failure in xfstests generic/452
Could you please elaborate more the reason why generic/452 in xfstests failed ?
> 
> Signed-off-by: Hyunchul Lee <hyc.lee@...il.com>
> ---
>  fs/exfat/super.c | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
> 
> diff --git a/fs/exfat/super.c b/fs/exfat/super.c index e650e65536f8..61c6cf240c19 100644
> --- a/fs/exfat/super.c
> +++ b/fs/exfat/super.c
> @@ -693,10 +693,29 @@ static void exfat_free(struct fs_context *fc)
>  	}
>  }
> 
> +static int exfat_reconfigure(struct fs_context *fc) {
> +	struct super_block *sb = fc->root->d_sb;
> +	int ret;
int ret = 0;
> +	bool new_rdonly;
> +
> +	new_rdonly = fc->sb_flags & SB_RDONLY;
> +	if (new_rdonly != sb_rdonly(sb)) {
If you modify it like this, would not we need new_rdonly?
        if (fc->sb_flags & SB_RDONLY && !sb_rdonly(sb))

> +		if (new_rdonly) {
> +			/* volume flag will be updated in exfat_sync_fs */
> +			ret = sync_filesystem(sb);
> +			if (ret < 0)
> +				return ret;
I think that this ret check can be removed by using return ret; below ?
> +		}
> +	}
> +	return 0;
return ret;
> +}
> +
>  static const struct fs_context_operations exfat_context_ops = {
>  	.parse_param	= exfat_parse_param,
>  	.get_tree	= exfat_get_tree,
>  	.free		= exfat_free,
> +	.reconfigure	= exfat_reconfigure,
>  };
> 
>  static int exfat_init_fs_context(struct fs_context *fc)
> --
> 2.17.1