Message-ID: <8b5071b3-ff00-b987-9519-f6cbf3232d22@linux.alibaba.com>
Date:   Fri, 3 Mar 2023 08:38:23 +0800
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Subject: Re: [PATCH v4 2/2] erofs: set block size to the on-disk block size
To:     Jingbo Xu <jefflexu@linux.alibaba.com>, xiang@kernel.org,
        chao@kernel.org, huyue2@coolpad.com, linux-erofs@lists.ozlabs.org
Cc:     linux-kernel@vger.kernel.org
References: <20230302143915.111739-1-jefflexu@linux.alibaba.com>
 <20230302143915.111739-3-jefflexu@linux.alibaba.com>
From:   Gao Xiang <hsiangkao@linux.alibaba.com>
In-Reply-To: <20230302143915.111739-3-jefflexu@linux.alibaba.com>
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On 2023/3/2 22:39, Jingbo Xu wrote:
> Set the block size to that specified in on-disk superblock.
> 
> Also remove the hard constraint of PAGE_SIZE block size for the
> uncompressed device backend.  This constraint is temporarily remained
> for compressed device and fscache backend, as there is more work needed
> to handle the condition where the block size is not equal to PAGE_SIZE.
> 
> It is worth noting that the on-disk block size is read prior to
> erofs_superblock_csum_verify(), as the read block size is needed in the
> latter.
> 
> Besides, later we are going to make erofs refer to tar data blobs (which
> is 512-byte aligned) for OCI containers, where the block size is 512
> bytes.  In this case, the 512-byte block size may not be adequate for a
> directory to contain enough dirents.  To fix this, we are also going to
> introduce directory block size independent on the block size.
> 
> Due to we have already supported block size smaller than PAGE_SIZE now,
> disable all these images with such separated directory block size until
> we supported this feature later.
> 
> Signed-off-by: Jingbo Xu <jefflexu@linux.alibaba.com>

Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>

Thanks,
Gao Xiang