[PATCH v4 2/3] erofs: introduce the secondary compression head

[Chao Yu]

On 2021/10/18 0:57, Gao Xiang wrote:
> From: Gao Xiang <hsiangkao at linux.alibaba.com>
> 
> Previously, for each HEAD lcluster, it can be either HEAD or PLAIN
> lcluster to indicate whether the whole pcluster is compressed or not.
> 
> In this patch, a new HEAD2 head type is introduced to specify another
> compression algorithm other than the primary algorithm for each
> compressed file, which can be used for upcoming LZMA compression and
> LZ4 range dictionary compression for various data patterns.
> 
> It has been stayed in the EROFS roadmap for years. Complete it now!
> 
> Reviewed-by: Yue Hu <huyue2 at yulong.com>
> Signed-off-by: Gao Xiang <hsiangkao at linux.alibaba.com>

Reviewed-by: Chao Yu <chao at kernel.org>

Thanks,