linux-kernel - Re: [PATCH] erofs: deprecate superblock checksum feature

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Message-ID: <82251dbb-6fb2-63a5-d15b-ba68ec75b4b2@linux.alibaba.com>
Date:   Fri, 14 Jul 2023 12:50:16 +0800
From:   Jingbo Xu <jefflexu@...ux.alibaba.com>
To:     Gao Xiang <hsiangkao@...ux.alibaba.com>, chao@...nel.org,
        huyue2@...lpad.com, linux-erofs@...ts.ozlabs.org
Cc:     linux-kernel@...r.kernel.org, pratikshinde320@...il.com
Subject: Re: [PATCH] erofs: deprecate superblock checksum feature



On 7/14/23 12:29 PM, Gao Xiang wrote:
> 
> 
> On 2023/7/14 11:38, Jingbo Xu wrote:
>> Later we're going to introduce fs-verity based verification for the
>> whole image.  Make the superblock checksum feature deprecated.
> 
> I'd suggest that
> 
> 
> "Later we're going to try the self-contained image verification.
>  The current superblock checksum feature has quite limited
>  functionality, instead, merkle trees can provide better protection
>  for image integrity.
> 
>  Since the superblock checksum is a compatible feature, just
>  deprecate now. "
>  

Yeah, another concern is that xxhash is used in the following xattr name
filter feature [1] which is on the way.  It may be redundant to use two
hashing algorithms for one filesystem.


[1]
https://lore.kernel.org/all/20230714031034.53210-1-jefflexu@linux.alibaba.com/

-- 
Thanks,
Jingbo