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Date:   Thu, 9 May 2019 09:15:45 +0800
From:   Chao Yu <yuchao0@...wei.com>
To:     Jaegeuk Kim <jaegeuk@...nel.org>, Chao Yu <chao@...nel.org>
CC:     <linux-kernel@...r.kernel.org>,
        <linux-f2fs-devel@...ts.sourceforge.net>
Subject: Re: [f2fs-dev] [PATCH] f2fs: fix to do sanity with enabled features
 in image

On 2019/5/5 10:51, Chao Yu wrote:
> On 2019/5/1 11:22, Jaegeuk Kim wrote:
>> On 04/29, Chao Yu wrote:
>>> On 2019-4-28 21:38, Jaegeuk Kim wrote:
>>>> 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.
>>>
>>> So any suggestion on how to implement this?
>>
>> Which features do we need to disallow? When we introduce new features, they
> 
> I guess it should be the new features.
> 
>> didn't hurt the previous flow by checking f2fs_sb_has_###().
> 
> Yes, but new features may use new disk layout, if old kernel handled it with old
> disk layout, there must be problematic.
> 
> e.g. format image with -O extra_attr, and mount it with kernel who don't
> recognize new inode layout.

Jaegeuk,

Any thoughts?

Thanks,

> 
> Thanks,
> 
>>
>>>
>>> Maybe:
>>>
>>> if (LINUX_VERSION_CODE < KERNEL_VERSION(4, 14, 0))
>>> 	check 4.14+ features
>>> else if (LINUX_VERSION_CODE < KERNEL_VERSION(4, 9, 0))
>>> 	check 4.9+ features
>>> else if (LINUX_VERSION_CODE < KERNEL_VERSION(4, 4, 0))
>>> 	check 4.4+ features
>>>
>>> Thanks,
>>>
>>>>
>>>>>
>>>>> 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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> .
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