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Date:   Sun, 28 Apr 2019 06:38:02 -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: fix to do sanity with enabled features in image

On 04/24, Chao Yu wrote:
> This patch fixes to do sanity with enabled features in image, if
> there are features kernel can not recognize, just fail the mount.

We need to figure out per-feature-based rejection, since some of them can
be set without layout change.

> 
> Signed-off-by: Chao Yu <yuchao0@...wei.com>
> ---
>  fs/f2fs/f2fs.h  | 13 +++++++++++++
>  fs/f2fs/super.c |  9 +++++++++
>  2 files changed, 22 insertions(+)
> 
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index f5ffc09705eb..15b640967e12 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -151,6 +151,19 @@ struct f2fs_mount_info {
>  #define F2FS_FEATURE_VERITY		0x0400	/* reserved */
>  #define F2FS_FEATURE_SB_CHKSUM		0x0800
>  
> +#define F2FS_ALL_FEATURES	(F2FS_FEATURE_ENCRYPT |			\
> +				F2FS_FEATURE_BLKZONED |			\
> +				F2FS_FEATURE_ATOMIC_WRITE |		\
> +				F2FS_FEATURE_EXTRA_ATTR |		\
> +				F2FS_FEATURE_PRJQUOTA |			\
> +				F2FS_FEATURE_INODE_CHKSUM |		\
> +				F2FS_FEATURE_FLEXIBLE_INLINE_XATTR |	\
> +				F2FS_FEATURE_QUOTA_INO |		\
> +				F2FS_FEATURE_INODE_CRTIME |		\
> +				F2FS_FEATURE_LOST_FOUND |		\
> +				F2FS_FEATURE_VERITY |			\
> +				F2FS_FEATURE_SB_CHKSUM)
> +
>  #define __F2FS_HAS_FEATURE(raw_super, mask)				\
>  	((raw_super->feature & cpu_to_le32(mask)) != 0)
>  #define F2FS_HAS_FEATURE(sbi, mask)	__F2FS_HAS_FEATURE(sbi->raw_super, mask)
> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
> index 4f8e9ab48b26..57f2fc6d14ba 100644
> --- a/fs/f2fs/super.c
> +++ b/fs/f2fs/super.c
> @@ -2573,6 +2573,15 @@ static int sanity_check_raw_super(struct f2fs_sb_info *sbi,
>  		return 1;
>  	}
>  
> +	/* check whether kernel supports all features */
> +	if (le32_to_cpu(raw_super->feature) & (~F2FS_ALL_FEATURES)) {
> +		f2fs_msg(sb, KERN_INFO,
> +			"Unsupported feature:%u: supported:%u",
> +			le32_to_cpu(raw_super->feature),
> +			F2FS_ALL_FEATURES);
> +		return 1;
> +	}
> +
>  	/* check CP/SIT/NAT/SSA/MAIN_AREA area boundary */
>  	if (sanity_check_area_boundary(sbi, bh))
>  		return 1;
> -- 
> 2.18.0.rc1

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