[PATCH v2] erofs: tidy up EROFS on-disk naming

[Yue Hu]

On Fri, 31 Mar 2023 14:31:49 +0800
Gao Xiang <hsiangkao at linux.alibaba.com> wrote:

>  - Get rid of all "vle" (variable-length extents) expressions
>    since they only expand overall name lengths unnecessarily;
>  - Rename COMPRESSION_LEGACY to COMPRESSED_FULL;
>  - Move on-disk directory definitions ahead of compression;
>  - Drop unused extended attribute definitions;
>  - Move inode ondisk union `i_u` out as `union erofs_inode_i_u`.
> 
> No actual logical change.
> 
> Signed-off-by: Gao Xiang <hsiangkao at linux.alibaba.com>

Reviewed-by: Yue Hu <huyue2 at coolpad.com>