[PATCH 2/2] erofs-utils: introduce shared xattr support

[Li Guifu]

> From: Li Guifu <blucerlee at gmail.com>
> 
> Large xattrs or xattrs shared by a lot of files
> can be stored in shared xattrs rather than
> inlined right after inode.
> 
> Signed-off-by: Li Guifu <blucerlee at gmail.com>
> Signed-off-by: Gao Xiang <hsiangkao at aol.com>

Dear Gao Xiang,
   Should It need to add a configure parameter to 
cfg.c_inline_xattr_tolerance which is a custome threshold
of shared xattr ?